JP2012096192A - Jaw crusher - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a jaw crusher capable of preventing deterioration in quality of a product by preventing the shrink retreat of a jack more than necessary.SOLUTION: In a jaw crusher including a grizzly feeder 8 conveying a material to be crushed to a crushing device 30 while classifying the material to be crushed, the crushing device 30 includes: fixed teeth 33 and movable teeth 34 in a crushing chamber; a jack 42 attached to the movable teeth 34 and adjusting a tooth tip gap set by the fixed teeth 33 and the movable teeth 34 approaching each other; a pressure sensor 56 detecting a pressure of the jack 42; and a controller 80 controlling a drive speed of the grizzly feeder 8 in response to a detection value of the pressure sensor 56. The controller 80 includes an input part for inputting a signal corresponding to the pressure of the jack 42 as an input signal from the pressure sensor 56 and an output part for outputting a signal for changing a conveyance speed by the grizzly feeder 8 in response to the input signal.

Description

  The present invention relates to a jaw crusher used for crushing rocks, concrete galley and the like.

  In crushing sites and building demolition sites, self-propelled crushing machines are used to crush large grained rocks and concrete glass. One type of self-propelled crushing machine is a type of crusher that uses a jaw crusher. The jaw crusher is for crushing an object to be crushed into a space formed between a fixed tooth and a moving tooth that swings with respect to the fixed tooth. A feeder is generally used to supply the object to be crushed to the jaw crusher, and the particle size of the product after crushing is adjusted by adjusting the gap between the teeth of the moving teeth and the fixed teeth.

  Also, this type of jaw crusher defines the maximum value of the pressure of the jack that receives the crushing reaction force acting on the moving teeth from the object to be crushed and the pressure oil return line of the jack, and exceeds the specified maximum pressure. A relief valve that retracts the jack when a load is applied, a toggle plate interposed between the jack and the moving tooth, and the moving tooth is jacked so that the toggle plate is held between the jack and the moving tooth. Urging means for biasing to the side, a stroke sensor for detecting the stroke of the jack, and when the amount of jack degeneration detected by this stroke sensor exceeds the set value, the feeder is stopped and only the amount of degeneration detected A procedure for extending the jack, and a control device for executing a procedure for stopping the swinging movement of the moving tooth when the jack does not return to the original position as a result of executing the procedure. What has been disclosed.

  According to this prior art, the toggle plate is protected from breakage when the jack is retracted when an overload is applied. Therefore, the crushing operation can be performed by returning the jack to the position before the collapse without replacing the toggle plate. You can continue. At this time, even if the jack is degenerated, the operation is not immediately stopped, the jack is returned to the original position while the crushing device is operated, and the crushing operation is stopped only when the jack does not return to the original position. Technology is disclosed.

JP 2007-125495 A

  However, in the above-described prior art, the supply of the object to be crushed by the feeder does not stop until the amount of degeneration of the jack exceeds the set value, and the crushing continues until the jack returns to the original position. While continuing the crushing as described above, the jaw crusher is crushing at a tooth gap larger than the setting, and as a result, the quality of the product after crushing may be deteriorated.

  The objective of this invention is providing the jaw crusher which suppresses the fall of the quality of a product by suppressing the degeneracy of the jack more than necessary.

  A jaw crusher according to the present invention includes a main body frame, a crushing device for crushing an object to be crushed provided at the center in the longitudinal direction on the main body frame, a hopper provided on one side in the longitudinal direction on the main body frame, and the hopper A grizzly feeder that is provided below the crushing device and classifies the object to be crushed, a power unit provided on the other side of the main body frame and provided with a drive source therein, and a base end portion below the crushing device. In the jaw crusher provided with the discharge conveyor attached to the main body frame with the other end portion obliquely above the power unit provided below, the crushing device forms a crushing chamber, and in this crushing chamber A fixed tooth fixed to the main body frame, and a moving tooth provided so as to be eccentric with respect to the fixed tooth at a predetermined angle. A jack for adjusting a tip clearance provided in a relationship where the fixed tooth and the moving tooth are V-shaped, attached to the moving tooth, and the fixed tooth and the moving tooth are set close to each other. And a state quantity detecting means for detecting the state quantity of the jack and a control means for controlling the driving speed of the feeder in accordance with a detection value of the state quantity detecting means.

  The jaw crusher according to the present invention is according to claim 1, wherein the state quantity detection means detects the pressure of the jack as a load, and the control means outputs a signal corresponding to the pressure of the jack as a pressure. It has an input part which inputs as an input signal from a detection means, and an output part which outputs the signal which changes the conveyance speed by a grizzly feeder according to the input signal.

  Further, the jaw crusher according to the present invention relates to claim 2, wherein the state quantity detecting means detects a stroke position of the jack, and the control means is capable of correcting the stroke position of the jack. In some cases, transportation by a grizzly feeder is permitted.

  The jaw crusher according to the present invention relates to claim 2 or claim 3, wherein the control means is a position where a stroke position of the jack exceeds a preset predetermined stroke position, and the stroke position is preset. When it is detected that the state of not returning to the predetermined position continues for a predetermined time or more, at least one of the crushing device or the grizzly feeder is decelerated or stopped.

  A jaw crusher according to the present invention according to any one of claims 1 to 4 includes a traveling body at a lower portion of the main body frame, and is configured to be capable of self-running.

  According to the present invention, the pressure of the jack is monitored by the sensor, and the feeder is controlled before the overload protection device is activated to reduce the supply amount of the object to be crushed to the jaw crusher. It is possible to suppress the spread of the tooth gap due to the operation of, and improve the quality of the product.

It is a side view showing the whole jaw crusher structure concerning one embodiment of the present invention. It is a top view which shows the whole structure of the jaw crusher which concerns on one Embodiment of this invention. It is a sectional side view which shows the internal structure of the crushing apparatus with which the jaw crusher which concerns on one Embodiment of this invention was equipped. It is a sectional side view which shows the state which expanded the tooth-tip gap in FIG. 1 is a hydraulic circuit diagram showing an outline of a portion related to driving of a jack in a hydraulic drive device for a jaw crusher according to an embodiment of the present invention. It is a hydraulic circuit diagram which shows the outline | summary of the site | part regarding the drive of the crushing apparatus among the hydraulic drive apparatuses of the jaw crusher which concerns on one Embodiment of this invention. 1 is a hydraulic circuit diagram showing an outline of a portion related to driving of a feeder in a hydraulic drive device for a jaw crusher according to an embodiment of the present invention. It is a block diagram of the control apparatus with which the jaw crusher concerning one embodiment of the present invention was equipped. It is a flowchart showing the body control procedure at the time of the overload by the control apparatus with which the jaw crusher which concerns on one Embodiment of this invention was equipped.

  Hereinafter, an embodiment applied to a self-propelled jaw crusher will be described and described with reference to the drawings.

  FIG. 1 is a side view showing the entire structure of a jaw crusher according to an embodiment of the present invention, and FIG. 2 is a top view showing the entire structure of the jaw crusher according to an embodiment of the present invention. 3 is a side sectional view showing the internal structure of the crushing device provided in the jaw crusher according to one embodiment of the present invention, and FIG. 4 is a side sectional view showing a state where the tooth tip gap is widened in FIG. It is.

  FIG. 5 is a hydraulic circuit diagram showing an outline of a portion related to the drive of the jack in the hydraulic drive device of the jaw crusher according to the embodiment of the present invention, and FIG. 6 is a diagram of the jaw crusher according to the embodiment of the present invention. It is a hydraulic circuit diagram which shows the outline | summary of the site | part regarding the drive of a crushing apparatus among hydraulic drive units, FIG. 7: shows the outline | summary of the site | part regarding the drive of a feeder among the hydraulic drive devices of the jaw crusher which concerns on one Embodiment of this invention. It is a hydraulic circuit diagram. FIG. 8 is a block diagram of a control device provided in the jaw crusher according to one embodiment of the present invention, and FIG. 9 is an overload state by the control device provided in the jaw crusher according to one embodiment of the present invention. It is a flowchart showing the airframe control procedure. For convenience, the left side of the drawing in FIG. 1 is described as the rear side or one side in the longitudinal direction of the main body frame, and the right side of the drawing is described as the front side or the other side in the longitudinal direction of the main body frame.

  As shown in FIG. 1, the self-propelled jaw crusher 2 is attached to a traveling body 1 in which an endless crawler belt 6 is wound around a pair of track frames 5 and a body frame 4 on the traveling body 1. A crushing device 30 provided in the center on the main body frame 4, a hopper 7 provided on one side of the main body frame 4, and a power unit 10 provided on the other side of the main body frame 4 and mounting a drive source therein. The discharge conveyor 9 for discharging the crushed material crushed by the crushing device 30 to the outside of the apparatus is generally configured.

  The traveling body 1 includes a traveling device 3 and a main body frame 4 provided substantially horizontally above the traveling device. The traveling device 3 outputs a track frame 5, driven wheels and drive wheels (both not shown) provided at both ends of the track frame 5, a crawler belt 6 wound around the driven wheels and the drive wheels, and an axis of the drive wheels. A traveling drive device (not shown) having a shaft connected thereto is provided. The track frame 5 is connected to the lower portion of the main body frame 4. In the present embodiment, the track frame 5 is formed integrally with the main body frame 4.

  The crusher main body 2 includes a hopper 7 that receives an object to be crushed (a material to be crushed), a grizzly feeder 8 that supplies the crushed material received in the hopper 7 to a subsequent process, and a substrate fed by the grizzly feeder 8. Power unit (power unit) incorporating a crushing device 30 for crushing crushed material, a discharge conveyor 9 for discharging the crushed material etc. crushed by this crushing device 30 to the outside of the machine, and a power source for operating devices mounted in various parts of the machine body 10 is provided.

  The hopper 7 is a frame-like member that expands upward, and is fixed to the support member 11 provided on the upper portion on one side on the main body frame 4 via support posts 12 and 13.

  The grizzly feeder 8 is supported on the main body frame 4 below the hopper 7 by a support member 11 via a spring (not shown) separately from the hopper 7. In the main body 14 of the grizzly feeder 8, a plurality (two in this embodiment) of grizzly rivers 16 having comb teeth 15 arranged in the width direction (vertical direction in FIG. 2) of the main body frame 4 at the front end portion. Is fixed in a staircase shape that descends forward. A feeder vibration device 17 that vibrates the grizzly feeder main body 14 is fixed to the lower portion of the grizzly feeder main body 14. When the grizzly feeder main body 14 is vibrated by the feeder vibration device 17, The object to be crushed on the grizzly river 16 is conveyed forward, and fine particles (so-called shear) or the like in the object to be crushed smaller than the gap between the comb teeth 15 fall from the gap between the comb teeth 15 and have a particle size smaller than that. A large object to be crushed moves on the comb teeth 15 and is supplied to the crushing device 30.

  A chute 18 is provided below the comb teeth 15 of the grizzly feeder 8, and a slip or the like falling from the gap between the comb teeth 15 is guided by the chute 18 to the vicinity of the rear end of the discharge conveyor 9.

  The crushing device 30 is located in front of the hopper 7 and the grizzly feeder 8 and is supported near the center of the main body frame 4 in the longitudinal direction. The crushing device 30 includes a pair of fixed teeth 33 and moving teeth 34 that are arranged to face each other so that the gap space (crushing chamber) of each crushing space decreases in the downward direction (see FIG. 3). The swing jaw 38 as the moving tooth 34 has an upper end connected to a flywheel (not shown), and when the rotational power of the driving device 31 for the crushing device is transmitted to the flywheel, the rotational motion of the flywheel is caused. This is converted into a swinging motion of the moving tooth 34, whereby the moving tooth 34 swings in the front-rear direction with respect to the fixed tooth 33.

  The discharge conveyor 9 includes a conveyor frame 19 that forms the outer shape of the discharge conveyor 9, driven wheels and drive wheels (both not shown) provided at both ends of the conveyor frame 19, and a conveyor belt ( (Not shown) and a drive device (not shown) for the discharge conveyor that rotationally drives the drive wheels. The discharge conveyor 9 is suspended and supported by the main body frame 4 via the support member 20 so as to rise obliquely from below the power unit with the lower position of the chute 18 and the crushing device 30 as the base end. When the drive wheels of the discharge conveyor 9 configured as described above are driven to rotate by the drive device for the discharge conveyor, the conveyor belt wound around the driven wheels is circulated and driven.

  Above the discharge conveyor 9 is provided a magnetic separator 21 for removing foreign substances (magnetic material) such as reinforcing bars mixed in the crushed material. The magnetic separator 21 is suspended and supported by an arm member 22 that is stretched over the main body frame 4 and the conveyor frame 19. A magnetic separator belt 23 wound around a driving wheel and a driven wheel (not shown) is arranged so as to be substantially orthogonal to the discharge conveyor 9. A magnetic force generating means (not shown) is provided in the space covered with the magnetic separator belt 23 between the driving wheel and the driven wheel (not shown), and foreign matters such as reinforcing bars are present in the crushed material of the discharge conveyor 9. When mixed, foreign matter is attracted to the magnetic separator belt 23 by the magnetic force from the magnetic force generating means acting over the magnetic separator belt 23, and is conveyed to the side of the discharge conveyor 9 and dropped by the magnetic separator belt 23 that is circulated. .

  The power unit 10 is supported at the other end portion in the longitudinal direction of the main body frame 4, and is disposed on the front side of the crushing device 30. Although not particularly illustrated, the power unit 10 includes an engine serving as a power source for the jaw crusher and hydraulic pumps 50, 60, and 70 driven by the engine (see FIGS. 5, 6, and 7 described later), Control valves 52, 62, 72 and the like are provided for controlling the flow direction and flow rate of the pressure oil discharged from the hydraulic pumps 50, 60, 70 and supplying them to the hydraulic actuator.

  3 and 4 are side sectional views showing the internal structure of the crushing device 30, FIG. 3 shows a working state, and FIG. 4 shows a state in which the moving teeth 34 are retracted.

  3 and 4, the crushing device 30 includes a crushing device frame 32 fixed to the main body frame 4, a fixed tooth 33 fixed to the crushing device frame 32, and a moving tooth 34 that swings with respect to the fixed tooth 33. And a toggle plate 35 that supports the lower side of the moving tooth 34.

  Strictly speaking, the fixed tooth 33 includes a support member 36 fixed to the crushing device frame 32 and a fixed tooth plate 33a fixed to the front surface (moving tooth 34 side) of the support member 36. The moving tooth 34 is fixed to the crushing device frame 32 through a swing jaw 38 that is swingably movable via an eccentric shaft 37 of a flywheel (not shown), and fixed to the rear surface (fixed tooth 33 side) of the swing jaw 38. And a movable tooth plate 34a. The moving teeth 34 and the fixed teeth 33 are arranged to face each other so that the tooth plates face each other, and a crushing chamber 39 that decreases in diameter downward is formed between both tooth plates. The object to be crushed supplied to the crushing chamber 39 is crushed so as to be crushed by the fixed teeth 33 and the moving teeth 34 by the swinging movement of the moving teeth 34. The particle size of the crushed material discharged from the crushing device 30 is defined by the lower exit width of the crushing chamber 39, that is, the minimum gap 40 between the fixed tooth plate 33a and the movable tooth plate 34a.

  Here, in the space on the opposite side to the crushing chamber 39 (right side in FIG. 3) with respect to the moving tooth 34, for example, when an overload occurs due to the occurrence of foreign matter biting in the crushing chamber 39, the toggle plate 35 An overload protection device 41 that protects such members from excessive loads is installed. This overload protection device 41 is a jack for relieving the excessive crushing reaction force by retracting from the working state of FIG. 3 as shown in FIG. 4 when the crushing reaction force acting on the swing jaw 38 exceeds the set range. 42 (details will be described later).

  The jack 42 is fixed to the crushing device frame 32, and toggle sheets 44 and 45 are provided at the front end portion of the rod 43 of the jack 42 and the front lower portion of the swing jaw 38, respectively. The toggle sheets 44 and 45 are in contact with both ends of a toggle plate 35 interposed therebetween, and the lower end portion of the swing jaw 38 is urged toward the jack 42 by a hydraulic cylinder 46 (see FIG. 4). As a result, the toggle plate 35 is sandwiched and held between the toggle sheets 44 and 45. Both ends of the hydraulic cylinder 46 are rotatably connected to the lower portion of the jack 42 and the vicinity of the lower end portion of the front surface of the swing jaw 38. In the present embodiment, the configuration in which the swing jaw 38 is biased toward the jack 42 by the hydraulic cylinder 46 is adopted. However, the swing jaw 38 is biased toward the jack 42 by a spring instead of the hydraulic cylinder 46. Also good.

  FIG. 5 is a hydraulic circuit diagram extracting and representing an outline of a portion related to driving of the jack 42 in the hydraulic drive device of the jaw crusher in the present embodiment.

  The hydraulic drive apparatus shown in FIG. 5 includes a hydraulic pump 50 driven by an engine or an electric motor (not shown), a control valve 52 and a check valve 53 provided in a discharge pipe 51 of the hydraulic pump 50, and a control valve. The jack 42 driven by the pressure oil supplied via 52, and a pressure sensor 56 and a relief valve 57 provided in a return pipe 55 from the jack 42 to the tank 54 are provided. The pressure sensor 56 measures the pressure of the pressure oil return pipe 55 of the jack 42 and inputs the measured pressure to an analog input unit 81 (to be described later) of the control device 80. The relief valve 57 regulates the maximum value of the pressure return line 55 of the pressure oil of the jack 42 by the urging force of the spring 57a provided on the relief valve 57, and the pressure of the return line 55 rising due to the crushing reaction force is increased. When the specified maximum pressure is exceeded, the return line 55 communicates with the tank 54 to play the role of contracting the jack 40, and the overload protection device 41 described above is configured together with the jack 40.

  In the hydraulic drive device shown in FIG. 5, when a drive signal is input from the control device 80 to the solenoid portion 52c of the control valve 52 and the control valve 52 is switched to the communication position 52b, the hydraulic pump 50 and the jack 42 on the bottom side The chamber 42 a communicates with the discharge line 51. Further, the bottom chamber 42 a of the jack 42 is pressurized by the pressure oil discharged from the hydraulic pump 50, and the rod 42 is pushed out to operate to extend the jack 42.

  On the other hand, in the normal state, the control valve 52 is in the state of the blocking position 52a by the biasing force of the spring 52d and blocks the flow of pressure oil in the discharge pipe 51. As shown in FIG. 5, when the control valve 52 is in the shut-off position 52a, the pressure oil supply / discharge path to the jack 42 is closed, so that the stroke of the jack 42 is maintained at that time. However, during the crushing operation, the crushing reaction force acting on the swing jaw 38 from the object to be crushed in the crushing chamber 39 acts on the rod 43 of the jack 42 via the toggle plate 35, so that the crushing reaction force is transmitted to the rod 43. Then, a force acts to push the pressure oil in the chamber 42a on the bottom side of the jack 42 out of the chamber 42a.

  If the crushing reaction force does not exceed the set value, the relief valve 57 is in the blocking position (state shown in FIG. 5) by the urging force of the spring 57a. The pressure oil in the side chamber 42a is sealed in the pipe line between the check valve 53 and the relief valve 57, and the stroke of the rod 43 is maintained as it is.

  However, when the crushing reaction force transmitted to the rod 43 exceeds the set value, the pressure in the return line 55 rises due to the pressure pushed away from the bottom side chamber 42a of the jack 42, and the pressure exceeds the biasing force of the spring 57a. Thus, the relief valve 57 is switched to the communication state. As a result, the chamber 42a of the jack 42 and the tank 54 are connected via the return pipe 55, and the pressure oil in the chamber 42a is discharged until the pressure in the return pipe 55 falls below the urging force of the spring 57a. The rod 43 is retracted by the amount of the discharge flow, and the jack 42 is retracted.

  At this time, in the present embodiment, the jack 42 is provided with a stroke sensor 58 that detects the stroke position or stroke amount of the rod 43. The stroke position of the rod 43 detected by the stroke sensor 58 is input to the analog input unit 81 of the control device 80. Further, the return pipe 55 is provided with a pressure sensor 56 for detecting the pressure of the return pipe 55 and the bottom side chamber 42 a of the jack 42. The pressure in the return line 55 detected by the pressure sensor 56 is input to the control device 80.

  FIG. 6 is a hydraulic circuit diagram that extracts and represents an outline of a portion related to the drive device 31 of the crusher 30 in the hydraulic drive device of the jaw crusher in the present embodiment. The hydraulic drive apparatus shown in FIG. 6 is supplied via a hydraulic pump 60 driven by an engine or an electric motor (not shown), a control valve 62 provided in a discharge pipe 61 of the hydraulic pump 60, and a control valve 62. A crusher driving device (for example, a crusher driving hydraulic motor) 31 driven by pressure oil and a return pipe 64 from the driving device 31 to the tank 63 are provided.

  In the hydraulic drive device shown in FIG. 6, when a drive signal is input from the control device 80 to the solenoid portion 62a of the control valve 62 and the control valve 62 is switched to the communication position, the hydraulic pump 60 and the drive device 31 are connected to the discharge pipe. The drive unit 31 is driven by the pressure oil discharged from the hydraulic pump 60 through the passage 61 to drive the crusher 30.

  FIG. 7 is a hydraulic circuit diagram that extracts and shows an outline of a part related to the drive device 73 (hydraulic motor for driving the grizzly feeder) of the vibration device 17 of the grizzly feeder 8 among the hydraulic drive devices of the jaw crusher in this embodiment. is there. The hydraulic drive device shown in FIG. 7 is supplied via a hydraulic pump 70 driven by an engine or an electric motor (not shown), a control valve 72 provided in a discharge pipe 71 of the hydraulic pump 70, and the control valve 72. A drive device 73 of the vibration device 17 driven by pressure oil and a return line 75 from the drive device 73 to the tank 74 are provided.

  In the hydraulic drive device shown in FIG. 7, when a drive signal is input from the control device 80 to the solenoid portion 72a of the control valve 72 and the control valve 72 is switched to the communication position, the hydraulic pump 70 and the drive device 73 are connected to the discharge pipe. The drive device 73 is driven by the pressure oil discharged from the hydraulic pump 70 through the passage 71 to drive the feeder 8.

  FIG. 8 is a block diagram of the control device 80.

  In FIG. 8, the control device 80 receives an analog input unit (AD converter) 81 that inputs detection signals of the pressure sensor 56 and the stroke sensor 58 and converts them into digital signals, and an operation panel (not shown) provided in the machine body, for example. And a digital input unit 83 for inputting an operation signal from the operation switch 82. Furthermore, the pressure sensor 56 input to the analog input unit 81, a temporary storage unit (RAM) 84 for temporarily storing the detection values and the like by the stroke sensor 58, and a storage unit for storing programs and constants necessary for control. (ROM) 85, and an arithmetic control unit (CPU) 86 that calculates various command values according to a desired program read from the storage unit 86 based on the detection signal input to the analog input unit 81. A display control unit 88 that inputs a command value from the display unit, calculates and outputs a display signal to the display unit 87 provided on the operation panel or the like, and inputs an operation signal input from the display unit 87 by a touch operation on the screen; The digital output part 89 which inputs the command value from the part 86, and outputs a command signal to the solenoid part 52c of the control valve 52 and other actuators, and the timer 90 which measures time are provided. To have.

  The storage unit 85 includes a program for decelerating the grizzly feeder 8 when the bottom chamber pressure of the jack 42 detected by the pressure sensor 56 exceeds a set value, and the rod 43 of the jack 42 detected by the stroke sensor 58. The procedure of extending the jack 42 by the amount of reduction detected when the amount of contraction of the gear exceeds the set value, and the swinging operation of the moving tooth 34 when the jack 42 does not return to the original position as a result of executing this procedure. A program for causing the arithmetic control unit 86 to execute the procedure for stopping is stored.

  Next, the operation of the jaw crusher in the present embodiment having the above configuration will be described.

  When the object to be crushed is put into the hopper 7 by a hydraulic excavator, a wheel loader or the like, the thrown object to be crushed is guided onto the grizzly feeder 8 and conveyed toward the crushing device 30 by vibration. At that time, fine grains (slipping etc.) smaller than the gaps between the comb teeth 15 of the grizzly river 16 are guided to the discharge conveyor 9 through the chute 18 from the gaps, and a larger object to be crushed (large lump). Is supplied to the crushing device 30. The material to be crushed supplied to the crushing device 30 is crushed to a predetermined particle size according to the exit gap 40 between the fixed tooth 33 and the moving tooth 34 and is introduced onto the lower discharge conveyor 9. The crushed material guided on the discharge conveyor 9 merges with the fine particles guided through the chute 18 and is conveyed forward (right side in FIG. 1), and adsorbs foreign matters such as reinforcing bars in the middle thereof. After being removed, it is discharged out of the machine.

  Here, the crushing reaction force that the moving tooth 34 receives from the object to be crushed during the crushing operation is transmitted to the rod 43 via the toggle plate 35. When the crushing reaction force is within the set value defined by the relief valve 57, the pressure oil in the bottom side chamber 42 a of the jack 42 is sealed in a pipe line between the relief valve 57 and the check valve 53. Therefore, the stroke of the rod 43 of the jack 42 is maintained in the state at that time. However, during the crushing operation, for example, a non-crushable foreign material such as a reinforcing bar may be supplied to the crushing chamber 39, or the supply of objects to be crushed to the crushing chamber may be excessive. When the crushing reaction force detected by the pressure sensor exceeds the set value stored in the storage unit 85, the controller 80 sends a command signal to the control valve 72 to stop the feeder motor. Further, when the crushing reaction force applied to the swing jaw 38 exceeds the set value defined by the relief valve 57, the overload protection device 41 is activated and the jack 40 is degenerated as described above. It is avoided and the toggle plate 35 is also protected from breakage.

  At this time, in the jaw crusher in the present embodiment, when the overload protection device 41 is activated, the jack 2 is immediately returned to the original position while continuing the crushing operation without interrupting the crushing operation. If the stroke of the jack 42 does not return to its original position during the time, the crushing operation is interrupted. However, once the overload protection device 41 is activated, the movable tooth tip minimum gap is widened, resulting in a state in which the quality of the crushed product before returning is reduced. Then, this invention suppresses the state where the quality of a crushing product falls by performing control mentioned later. Details of the control will be described below.

  FIG. 9 is a flowchart showing the airframe control procedure when the controller 80 is overloaded.

  9, first, for example, when an operation switch 82 of an operation panel (not shown) is operated and an operation signal instructing start of operation is input to the digital input unit 83, the input operation signal is input in step 100. In accordance with the program stored in the storage unit 85, the arithmetic control unit 86 generates a command signal to the driving device of each work device (grid feeder 8, crushing device 30, discharge conveyor 9, magnetic separator 21 etc.), and the command signal Is output to each driving device via the digital output unit 89, and each working device operates.

  During operation, the control device 80 receives detection signals from sensors provided in various parts of the machine body at any time or every set time. During operation, when detection signals from the pressure sensor 56 and the stroke sensor 58 are input to the analog input unit 81, the detection values converted into digital signals are stored in the temporary storage unit 84 and stored in the temporary storage unit 84. The pressure P of the bottom chamber 42a of the jack 42 and the stroke position X of the rod 43 of the jack 42 calculated by the calculation control unit 86 according to the detected value are sequentially stored in the temporary storage unit 84.

  Thus, during operation, the pressure P of the bottom chamber 42a of the jack 42 and the stroke position X of the rod 43 of the jack 42a are monitored by the control device 80. In the subsequent step 110, the calculated bottom chamber 42a of the cylinder 42 is monitored. The calculation control unit 86 determines whether or not the pressure P has reached the set value P1 stored in the storage unit. As a result, if it is determined that the bottom chamber pressure P has not reached the set value P1, the process returns to step 100 and the current operation state is maintained, and if it is determined that the bottom chamber pressure has reached the set value P1. The procedure moves to step 120.

  In step 120, the control device 80 outputs a deceleration signal to the feeder drive device 17 from the digital output unit 89 to decelerate the grizzly feeder 8, thereby reducing the supply of objects to be crushed to the crushing device 30, and to step 130. Transition.

  In addition, although the deceleration signal was output from the digital output unit 89 and the grizzly feeder 8 was decelerated to reduce the supply of objects to be crushed to the crushing device 30 as an example, the stop signal is output from the digital output unit 89. The grizzly feeder 8 may be output to stop the supply of the object to be crushed to the crushing device 30. Further, a method may be used in which the feeder motor control valve is a proportional valve, and the speed of the feeder driving device is controlled in accordance with the value of the pressure P of the bottom chamber 42a.

  In subsequent step 130, the calculation control unit 86 determines whether or not the calculated stroke position X of the rod 43 has reached the set position X <b> 1 stored in the storage unit 85. As a result, if it is determined that the stroke position X has not reached the set position X1, the procedure returns to step 110 to continue the current operation state, and it is determined that the stroke position X has reached the set position X1. The procedure moves to step 140.

  In step 140, the control device 80 corrects the stroke position X of the rod 43 and outputs a signal instructing the return of the rod 43 to the original position. Specifically, the control device 80 generates a command signal for extending the jack 51 and outputs the command signal to the solenoid unit 52 c of the control valve 52 via the digital output unit 89. As a result, the control valve 52 is switched to the communication position 52b, and the outlet side chamber 42 of the jack 42 is pressurized to extend the jack 51.

  In subsequent step 150, the control device 80 compares the detected stroke position X of the rod 43 with the stroke position (original position) X 0 of the rod 43 at the start of operation stored in the temporary storage unit 84. Determine whether two values are equal. Here, it is desirable that the two values are not completely the same, and an allowable range is set for the error. As a result, if it is determined that the rod 43 has returned to the original position X0, the procedure returns to step 110 to determine the bottom chamber pressure again.

  In this way, even if an overload state occurs, the grizzly feeder 8 is decelerated to temporarily supply the object to be crushed to the crushing device 30 during the execution of the procedure from step 130 to step 150 and from step 150 to step 110. The operation of the crushing device 30 is continued only by reducing it.

  On the other hand, if it is determined in step 150 that the stroke position X of the rod 43 has not returned to the original position X0, the control device 80 moves the procedure to step 160 and moves the rod 43 to the original position based on the measurement time of the timer 90. In order to return to the position X0, in step 140, it is determined whether or not the elapsed time T from the output of the command signal to the solenoid 52a exceeds the set time T1. If the set time T1 has not elapsed at that time, the procedure returns to step 140, and a command signal is output again to the solenoid unit 52a to return the rod 43 to the original position X0.

  In step 160, if the set time T1 has passed without the rod 43 returning to the original position X0, the control device 80 proceeds to step 170. In step 170, a command signal for stopping the grizzly feeder 8, the crushing device 30, the discharge conveyor 9, and the magnetic separator 21, which are each operating device, is generated, and the command signal is output to each drive device via the digital output unit 89. Then, the crushing operation is interrupted and the procedure of FIG.

  Although not specifically shown in the flowchart of FIG. 9, the control device 80 sequentially stores the stroke position X of the rod 43 in the temporary storage unit 84 and also displays the control panel display unit 87 via the display control unit 88. The bottom chamber pressure P may be sequentially notified to the operator by outputting a display signal. Further, instead of sequentially displaying the bottom chamber pressure P, it may be displayed that the overload protection device is about to operate. In this case, for example, it is conceivable to perform visual or audible notification from the time when P ≧ P1 is determined at step 110 to the time when P ≦ P1 is determined again at step 110. As the visual notification, for example, it is conceivable to display character information to that effect on the display unit 87, or display it using light or color on the display unit 87 or a warning light (not shown). . As an auditory notification, a notification by voice or a warning sound can be considered.

  As described above, according to the embodiment described above, the following effects can be obtained.

(1) Improving the accuracy of overload control of the cylinder 42 In the present embodiment, the feeder 42 is decelerated before the jack 42 is degenerated due to overload. For example, the bottom of the cylinder 42 due to excessive supply of crushed objects The overload state of the chamber 42a can be prevented.

  In addition, even when foreign matter enters the crushing chamber, the feeder is decelerated before the jack is degenerated due to overload, thereby suppressing the input of raw materials to the crushing chamber with the minimum gap of the movable tooth tip widened. can do.

  In addition, there is a method of using the driving pressure of the crusher driving device for overload control during crushing of the crushing device, but in the overload control of the cylinder 42, the pressure is directly measured, so that accuracy is improved. Can do.

(2) Quality improvement of crushing product The effect of (1) can suppress the operation of the overload protection device and the spread of the minimum gap of the movable tooth tip, thereby reducing the possibility of the quality reduction of the crushing product.

30 Grizzly feeder 32 Crusher frame 33 Fixed teeth 34 Moving teeth 35 Toggle plate 37 Eccentric shaft 39 Crushing chamber 42 Jack 46 Hydraulic cylinder 52 Control valve 55 Return line 56 Hydraulic sensor 57 Relief valve 58 Stroke sensor 73 Feeder drive device 80 Control apparatus

Claims (5)

Body frame,
A crushing device for crushing the object to be crushed provided in the center in the longitudinal direction on the main body frame;
A hopper provided on one side in the longitudinal direction on the main body frame;
A grizzly feeder that is provided below the hopper and conveys the object to be crushed while classifying it to the crushing device;
A power unit provided on the other side of the main body frame and provided with a drive source therein;
In a jaw crusher provided with a discharge conveyor attached to the main body frame with a second end inclined obliquely above the power unit and provided with a base end under the crushing device,
The crushing device forms a crushing chamber,
In this crushing chamber,
Fixed teeth fixed to the body frame;
A moving tooth provided to be eccentric with a predetermined angle with respect to the fixed tooth,
The fixed teeth and the moving teeth are provided in a V-shaped relationship,
A jack attached to the moving tooth, for adjusting a tooth tip gap in which the fixed tooth and the moving tooth are set close to each other;
State quantity detection means for detecting the state quantity of the jack;
A jaw crusher comprising control means for controlling a driving speed of the feeder according to a detection value of the state quantity detection means.   The state quantity detection means detects the pressure of the jack as a load, and the control means inputs an input unit that inputs a signal corresponding to the pressure of the jack as an input signal from the pressure detection means, and the input signal The jaw crusher according to claim 1, further comprising: an output unit that outputs a signal for changing a conveyance speed by the grizzly feeder according to the condition.   The state quantity detection means detects a stroke position of a jack, and the control means permits transportation by a grizzly feeder when the stroke position of the jack can be corrected. The jaw crusher according to claim 2.   When the control means detects that the stroke position of the jack exceeds a preset predetermined stroke position and the state where the stroke position does not return to the preset predetermined position has continued for a preset predetermined time or longer. The jaw crusher according to claim 2 or 3, wherein at least one of the crushing device and the grizzly feeder is decelerated or stopped.   The jaw crusher according to any one of claims 1 to 4, wherein a traveling body is provided at a lower portion of the main body frame so as to be capable of self-running.

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