CN107795279B - Drilling machine and engineering vehicle - Google Patents

Abstract

The present invention relates to a drilling machine and an engineering vehicle. The drilling machine comprises: a hydraulic motor, which is used to drive a drilling tool screwed into a formation to rotate, and the hydraulic motor has a detection port for outputting a hydraulic fluid reflecting the load size; a hydraulic drive element, which is used to apply a pressurized pressure toward the formation to the drilling tool; a pump, which provides hydraulic fluid to the hydraulic drive element; and a pressure regulating valve, which comprises an inlet connected to the pump, an outlet connected to the hydraulic drive element, and a control port for introducing a hydraulic fluid for adjusting the opening of the pressure regulating valve, the control port being connected to the detection port of the hydraulic motor to introduce the hydraulic fluid output from the detection port, and the opening of the pressure regulating valve can change inversely with the pressure change of the hydraulic fluid output from the detection port, thereby improving the problems of poor sensitivity and inaccurate control in manually adjusting the pressurized pressure of the drilling tool, realizing the automatic pressurization function of the drilling machine pressurized oil cylinder, and improving the automation level and operation efficiency of the drilling machine.

Description

Drilling rigs and construction vehicles

Technical Field

The present invention relates to the field of engineering machinery, and in particular to a drilling machine and an engineering vehicle.

Background technique

The prior art drilling machine (such as a rotary drilling machine) includes a bearing part for mounting a drilling tool and a hydraulic motor mounted on the bearing part, and the hydraulic motor is used to drive the drilling tool to rotate. The drilling tool includes a rod-shaped base body and a guide component spirally extending along the rod-shaped base body. The soil or gravel in the formation is transported to the ground during the rotation of the drilling tool.

The drilling rig also includes a hydraulic drive component for pressing the drill bit into the formation. The hydraulic drive component includes a pressurized hydraulic cylinder. During the operation of the drilling rig, the magnitude of the pressurizing force directly affects the torque value output by the power head, thereby affecting the cutting force of the drill bit on the formation. Appropriate cutting force can achieve high cutting and drilling of the formation. When drilling in a formation with a relatively high hardness, if the pressurizing pressure of the drill bit on the formation is too large, it is easy to cause the drill bit to rotate slowly or even not rotate. Therefore, whether the selection of the pressurizing pressure is appropriate has a great impact on the construction efficiency of the rotary drilling rig. In the existing design scheme of the rotary drilling rig, the magnitude of the pressurizing pressure is completely dependent on the operator to continuously push and pull the handle back and forth to control the valve opening of the reversing valve, which requires high skills and experience of the operator, and there are problems such as poor sensitivity and inaccurate control in manually adjusting the pressurizing pressure of the pressurized oil cylinder.

Summary of the invention

The present invention aims to provide a drilling machine and an engineering vehicle to improve the problems of poor sensitivity and inaccurate control in the prior art of manually adjusting the pressurization pressure of a drilling tool into a formation.

According to one aspect of an embodiment of the present invention, the present invention provides a drilling machine, the drilling machine comprising:

A hydraulic motor is used to drive the drilling tool screwed into the formation to rotate, and the hydraulic motor has a detection port for outputting a hydraulic fluid reflecting the load size;

A hydraulic drive element for applying pressurized pressure to the drilling tool toward the formation;

a pump to supply hydraulic fluid to the hydraulic drive element; and

A pressure regulating valve comprises a pressure regulating valve inlet connected to a pump, a pressure regulating valve outlet connected to a hydraulic drive element, and a pressure regulating valve control port for introducing a hydraulic fluid for adjusting the opening of the pressure regulating valve. The pressure regulating valve control port is connected to a detection port of a hydraulic motor to introduce the hydraulic fluid output from the detection port. The opening of the pressure regulating valve can change inversely with the pressure change of the hydraulic fluid output from the detection port.

Optionally, the pressure regulating valve comprises:

A valve body having a pressure regulating valve inlet and a pressure regulating valve outlet, comprising a first chamber communicating with both the inlet and the outlet;

A valve core is movably disposed in the first chamber to change the opening of the pressure regulating valve;

a control fluid chamber communicating with the control port of the pressure regulating valve to introduce a hydraulic fluid for pushing the valve core toward a first direction; and

The elastic component is used to push the valve core toward a second direction, which is opposite to the first direction.

Optionally, the valve body comprises:

A base body having a second chamber;

The valve sleeve is sleeved in the second chamber and detachably connected to the base body. The first chamber is formed in the inner cavity of the valve sleeve.

Optionally, the valve body further comprises:

a third chamber, communicating with the first chamber, for arranging an elastic member therein; and

Optionally, a flow channel connecting the third chamber and the drain port is provided on the valve core.

Optionally, the drilling rig further comprises:

Storage components;

a first flow path including a first flow path inlet for communicating with a control port of the pressure regulating valve and a first flow path outlet for communicating with a storage member to discharge hydraulic fluid for regulating an opening degree of the pressure regulating valve when the pressure regulating valve increases its opening degree; and

The second flow path includes a second flow path inlet for connecting to the detection port of the hydraulic motor and a second flow path outlet for connecting to the control port of the pressure regulating valve, so as to feed back the pressure of the hydraulic fluid inside the hydraulic motor to the pressure regulating valve. The flow resistance of the first flow path is smaller than the flow resistance of the second flow path.

Optionally,

A first one-way valve is provided in the first flow path; and/or

A first throttle component is provided in the second flow path.

Optionally, the drilling rig further comprises:

a third flow path including a third inlet for communicating with the detection port of the hydraulic motor and a third flow path outlet for communicating with the storage component; and

The second throttling component is arranged in the third flow path.

Optionally, the first flow path outlet is communicated with the third flow path inlet.

Optionally, the drilling machine further includes a fourth flow path, the fourth flow path includes a fourth flow path inlet and a fourth flow path outlet, the fourth flow path inlet is connected to the detection port of the hydraulic motor, the fourth flow path outlet is connected to the second flow path inlet and to the third flow path inlet.

According to another aspect of the present application, an engineering vehicle is also provided, the engineering vehicle comprising:

the vehicle body; and

The drilling machine is installed on the vehicle body.

By applying the technical solution of the present application, the detection port of the hydraulic motor is connected to the control port of the pressure regulating valve. The pressure regulating valve controls the pressure of the hydraulic fluid input by the hydraulic drive element in real time and accurately according to the load pressure of the hydraulic motor, thereby improving the problems of poor sensitivity and inaccurate control in the prior art of manually adjusting the pressure of the drilling tool to increase the pressure on the formation.

Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the attached drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

FIG1 is a schematic structural diagram of a hydraulic system of a drilling rig according to an embodiment of the present invention;

FIG2 is a schematic structural diagram of a pressure regulating valve for a drilling machine according to an embodiment of the present invention;

FIG3 is a schematic structural diagram of a valve sleeve and a valve core of a pressure regulating valve according to an embodiment of the present invention; and

FIG. 4 is a schematic diagram showing a partial structure of a pressurized hydraulic system of a drilling machine according to an embodiment of the present invention.

In the figure: 1, hydraulic motor; 2, storage component; 3, pressure regulating system; 4, pressure regulating valve; 5, reversing valve; 6, balancing valve; 7, hydraulic drive element; 8, base; 9, valve sleeve; 10, fourth hole; 11, third hole; 12, first hole; 13, third chamber; 14, limit component; 15, locking nut; 16, screw; 17, first sealing ring; 18, second sealing ring; 19, elastic component; 20, third sealing ring; 21, flow channel; 22, fourth sealing ring; 23, fifth hole; 24, valve core; 2 5. Sixth sealing ring; 26. Seventh sealing ring; 27. Fifth sealing ring; 28. Sealing component; 29. Sixth hole; 30. Second annular groove; 31. First annular groove; 32. First radial hole; 33. Axial hole; 34. Second radial hole; 35. Control fluid chamber; 36. Fourth flow path; 37. Filter component; 38. Third throttling component; 39. First one-way valve; 40. First flow path; 41. Second flow path; 42. First throttling component; 43. Second throttling component; 44. Second one-way valve; 45. Third flow path.

Detailed ways

The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Fig. 1 shows a schematic diagram of the structure of the hydraulic system of the drilling machine of the present embodiment. As shown in Fig. 1, the drilling machine of the present embodiment comprises a hydraulic motor 1 for driving a drill bit screwed into a formation to rotate, a hydraulic drive element 7 for driving the drill bit to move into the formation, a pump for providing hydraulic fluid to the hydraulic drive element 7, and a pressure regulating valve 4 for regulating the pressure of the hydraulic fluid input by the hydraulic drive element 7.

The pressure regulating valve includes a pressure regulating valve inlet P ₁ communicating with the pump, a pressure regulating valve outlet A ₁ communicating with the hydraulic drive element 7 , and a pressure regulating valve control port X for introducing hydraulic fluid for adjusting the opening of the pressure regulating valve 4 .

The hydraulic motor 1 has a detection port for outputting hydraulic fluid reflecting the load size. The pressure regulating valve control port is connected to the detection port of the hydraulic motor 1 to feed back the pressure of the hydraulic fluid in the hydraulic motor 1 to the detection port X of the pressure regulating valve 4. The opening of the pressure regulating valve 4 can change inversely with the change of the pressure of the hydraulic fluid in the hydraulic motor 1.

When the drilling rig is drilling in a formation with relatively high hardness, the pressure of the hydraulic fluid in the hydraulic motor 1 increases, and the opening of the corresponding pressure regulating valve 4 decreases, thereby increasing the pressure loss from the pressure regulating valve inlet _P1 to _A1 of the pressure regulating valve 4, so that the pressurized pressure input by the hydraulic drive element 7 decreases.

When the drilling rig is drilling in a formation with lower hardness, the pressure of the hydraulic fluid in the hydraulic motor 1 decreases. Since the pressure at the control port X of the pressure regulating valve is lower than the set pressure of the elastic component 19, the valve core 24 of the corresponding pressure regulating valve 4 remains stationary, the pressure regulating valve 4 is in a normally open state, and the pressurized pressure of the pressurized oil cylinder is not reduced, thereby ensuring that the drilling tool works efficiently at a small load pressure.

It can be seen that the drilling rig of this embodiment can adjust the pressure of the drill bit into the formation according to the load pressure of the hydraulic motor 1, so as to prevent the drilling rig from reducing or even stopping its rotation speed due to overload, and at the same time improve the working efficiency of the drilling rig.

The hydraulic drive element 7 of this embodiment includes a hydraulic cylinder.

The drilling machine further comprises a reversing valve 5, which comprises an inlet P connected to the pump, a return port T connected to the storage component, a first working port A connected to the rod chamber of the hydraulic cylinder, and a second working port B connected to the rodless chamber of the hydraulic cylinder.

The drilling rig further comprises a balancing valve 6 connected between the hydraulic cylinder and the reversing valve 5 .

Fig. 2 shows a schematic structural diagram of the pressure regulating valve 4 of this embodiment. As shown in Fig. 4 , the pressure regulating valve 4 of this embodiment includes a valve body, a valve core 24 , a control fluid chamber 35 and an elastic component 19 .

The valve body is provided with a pressure regulating valve inlet P1, a pressure regulating valve outlet A1 and a first chamber, both of which are communicated with the first chamber. A valve core 24 is movably arranged in the first chamber to change the opening of the pressure regulating valve 4.

The control fluid chamber 35 is connected to the pressure regulating valve X to introduce the hydraulic fluid flowing out of the detection port of the hydraulic motor 1. The area of the first end surface M1 of the control fluid chamber 35 is larger than the area of the second end surface M2. The second end surface M2 and the first end surface M1 are arranged in sequence along the first direction. Therefore, the hydraulic fluid in the control fluid chamber 35 is used to push the valve core 24 toward the first direction. The opening of the pressure regulating valve 4 decreases during the movement of the valve core 24 toward the first direction.

The pressure regulating valve 4 further comprises an elastic component 19 for pushing the valve core 24 in a second direction, the second direction being opposite to the first direction. When the valve core 24 moves in the second direction, the opening of the pressure regulating valve 4 is reduced.

When the load of the hydraulic motor 1 is less than a predetermined value, the force of the hydraulic fluid in the control fluid chamber 35 pushing the valve core 24 is less than the elastic force of the elastic component 19. At this time, the hydraulic motor 1 and the hydraulic drive element 7 both work normally.

After the load of the hydraulic motor 1 is greater than the predetermined value, the force of the hydraulic fluid in the control fluid chamber 35 pushing the valve core 24 is greater than the elastic force of the elastic component 19, and the opening of the pressure regulating valve 4 decreases as the load pressure of the hydraulic motor 1 increases, so as to reduce the pressurization pressure of the drilling tool into the formation.

In this embodiment, the valve body of the pressure regulating valve 4 includes a base body 8 provided with a second chamber and a valve sleeve 9 sleeved in the second chamber, and the first chamber is formed in the inner cavity of the valve sleeve 9. The valve sleeve 9 is detachably connected to the base body 8, which is convenient for repairing or maintaining the pressure regulating valve 4.

FIG3 is a schematic diagram showing the structure of the valve sleeve 9 of this embodiment. As shown in FIG2 and FIG3, a third chamber is further formed in the inner cavity of the valve sleeve 9, and the third chamber is used to arrange an elastic component 19 therein. The valve body is also provided with a drain port communicated with the third chamber 13 to discharge the hydraulic fluid in the third chamber 13. The drain port is communicated with the storage component 2 for storing the hydraulic fluid.

The first end of the elastic component 19 abuts against the valve core 24 , and the second end of the elastic component 19 is provided with a limiting component 14 . The limiting component 14 is connected to the valve sleeve 9 to limit the elastic component 19 in the third chamber 13 .

In this embodiment, the force of the elastic component 19 pushing the valve core 24 is adjustable. The pressure regulating valve 4 also includes a threaded driving mechanism for pushing the elastic component 19 , which is used to adjust the force of the elastic component 19 pushing the valve core 24 .

The threaded drive mechanism includes a screw 16 threadedly matched with the limiting component 14 . The screw 16 abuts against the second end of the elastic component 19 . When the screw 16 rotates relative to the limiting component 14 , the force of the elastic component 19 pushing the valve core 24 can be adjusted.

The pressure regulating valve 4 further includes a locking nut 15 for limiting the rotation of the screw 16 relative to the limiting component 14, so as to limit the screw 16 from pushing the elastic component 19. When it is necessary to adjust the force of the elastic component 19 pushing the valve core 24, the locking nut 15 needs to be loosened, and the locking nut 15 is tightened after the force of the elastic component 19 pushing the valve core 24 is adjusted.

A first sealing ring 17 is sleeved between the screw 16 and the limiting component 14. An annular groove for accommodating the first sealing ring 17 is provided on the outer circumference of the screw 16, and a retaining ring is also provided in the annular groove for fixing the first sealing ring in the annular groove. A second sealing ring 18 is sleeved between the limiting component 14 and the valve sleeve 9.

The valve core 24 is provided with a flow channel 21 for connecting the drain port and the third chamber 13. When the pressure of the hydraulic fluid in the control fluid chamber 35 pushing the valve core 24 is less than the elastic force of the elastic member 19, the flow channel 21 is connected to the drain port to discharge the hydraulic fluid in the third chamber 13.

As shown in combination with FIG. 2 and FIG. 3 , the base 8 of the valve body is provided with a first hole 12 communicating with the pressure regulating valve inlet P1 and a second hole communicating with the pressure regulating valve outlet A1 .

The valve sleeve 9 is provided with a third hole 11 communicating with the first hole 12 and a fourth hole 10 communicating with the second hole.

The valve core 24 is provided with a first annular groove 31 for communicating with the third hole 11 and a second annular groove 30 for communicating with the fourth hole 10 .

A first radial hole 32 is provided at the bottom of the first annular groove 31 , a second radial hole 34 is provided at the bottom of the second annular groove 30 , and an axial hole 33 for connecting the first radial hole 32 and the second radial hole 34 is also provided on the valve core 24 .

The axial hole 33 extends from the end surface of the valve core 24 toward the inside of the valve core 24 along the axial direction. A blocking component 28 is provided at the end of the axial hole 33. The blocking component 28 is fixed to the valve core 24 by screws.

The hydraulic fluid introduced into the pressure regulating valve inlet P1 flows through the first hole 12, the third hole 11, the first annular groove 31, the first radial hole 32, the axial hole 33, the second radial hole 34, the second annular groove 30, the fourth hole 10 and the second hole in sequence, and then, the hydraulic fluid is delivered to the hydraulic drive element 7 through the outlet A1 of the pressure regulating valve 4.

During the movement of the valve core 24 , the relative surfaces of the first annular groove 31 and the third hole 11 change or the relative surfaces of the second annular groove 30 and the fourth hole 10 change, thereby changing the opening of the pressure regulating valve 4 and further changing the pressure of the hydraulic fluid input by the hydraulic drive element 7 .

The valve sleeve 9 is sleeved in the second chamber, and a third sealing ring 20 is provided at one end of the second chamber adjacent to the elastic component 19. The third sealing ring 20 is sleeved between the base 8 and the valve sleeve 9. An annular groove 20a for accommodating the third sealing ring 20 is also provided on the outer peripheral surface of the valve sleeve 9.

The valve sleeve 9 is also provided with a fifth hole 23 for communicating with the flow channel 21. A fourth sealing ring 22, a fifth sealing ring 27, a sixth sealing ring 25 and a seventh sealing ring 26 are also sleeved between the valve sleeve 9 and the base body 8.

The fourth sealing ring 22, the fifth hole 23, the fifth sealing ring 27, the third hole 11, the sixth sealing ring 25, the fourth hole 10 and the seventh sealing ring 26 are arranged in sequence along the valve core to isolate the hole between two adjacent sealing rings from the outside.

As shown in Fig. 3, the outer circumferential surface of the valve sleeve 9 is further provided with an annular groove 22a for accommodating the fourth sealing ring 22, an annular groove 27a for accommodating the fifth sealing ring 27, an annular groove 25a for accommodating the sixth sealing ring 25, and an annular groove 26a for accommodating the seventh sealing ring 26. A retaining ring is provided in each annular groove for fixing the sealing ring in the annular groove.

As shown in FIG3 , the valve sleeve 9 is further provided with a sixth hole 29 , and the base of the valve body is further provided with a seventh hole for connecting the sixth hole and the pressure regulating valve X. The hydraulic fluid introduced into the pressure regulating valve X flows into the control fluid chamber 35 through the seventh hole and the sixth hole 29 to push the valve core 24 .

As shown in FIG. 1 , the drilling machine of the present embodiment further includes a pressure regulating system 3 for regulating the pressure of the hydraulic fluid outputted and inputted by the pressure regulating valve X of the pressure regulating valve 4 .

The pressure regulating system 3 includes a first flow path 40, which includes a first flow path inlet for connecting to the pressure regulating valve control port and a first flow path outlet for connecting to the storage component 2, so as to discharge hydraulic fluid for adjusting the opening of the pressure regulating valve 4 when the pressure regulating valve 4 increases its opening.

The pressure regulating system 3 further includes a second flow path 41, which includes a second flow path inlet for communicating with the detection port of the hydraulic motor 1 and a second flow path outlet for communicating with the control port of the pressure regulating valve, so as to feed back the pressure of the hydraulic fluid inside the hydraulic motor 1 to the pressure regulating valve, and the flow resistance of the first flow path 40 is smaller than the flow resistance of the second flow path 41. A first throttling component 42 is provided in the second flow path 41.

The hydraulic fluid output from the detection port of the hydraulic motor 1 is transported to the control port X of the pressure regulating valve after throttling. The pressure regulating valve 4 adjusts the opening according to the pressure of the hydraulic fluid in the hydraulic motor 1 to adjust the pressurized pressure of the hydraulic drive element 7 pushing the drill bit. Therefore, the drilling machine of this embodiment can automatically and in real time adjust the pressurized pressure applied to the drill bit by the hydraulic drive element 7 according to the hardness of the formation.

Furthermore, when the pressure of the hydraulic fluid in the hydraulic motor 1 is less than a predetermined value, the elastic component 19 pushes the valve core 24 to move in the second direction, and the hydraulic fluid in the control fluid chamber 35 is transported to the storage component 2 through the first flow path. The flow resistance of the first flow path 40 is relatively small, so when the load pressure of the hydraulic motor 1 becomes smaller, the hydraulic drive element 7 can respond quickly to increase the pressurization pressure of the drilling tool, which is beneficial to improving the working efficiency of the drilling machine.

The second flow path 41 and the first flow path 40 are both connected to the pressure regulating valve X. When the pressure of the hydraulic fluid of the hydraulic motor 1 is less than the predetermined value of the elastic component 19, in order to increase the response speed of the pressure regulating valve 4 and enable the hydraulic fluid in the control fluid chamber 35 to quickly leak back to the storage component 2, a first one-way valve 39 is provided in the first flow path 40.

The first one-way valve 39 includes a valve core, and the valve core has a first position that makes the first one-way valve 39 in a closed state and a second position that makes the first one-way valve 39 in an open state. The first one-way valve 39 also includes a spring for pushing the valve core of the first one-way valve 39 toward the first position. The first one-way valve 39 can only be in an open state when the pressure of the hydraulic fluid discharged from the control port of the pressure regulating valve is greater than the elastic force of the spring, and then the pressure regulating valve 4 adjusts the opening according to the pressure change in the hydraulic motor 1.

The pressure regulating system 3 further includes a third flow path 45, the third flow path 45 includes a third flow path inlet for communicating with the detection port of the hydraulic motor 1 and a third flow path outlet for communicating with the storage component 2, and a second throttling component 43 is provided in the third flow path 45. A second one-way valve 44 is also provided in the third flow path 45. Optionally, the second one-way valve 44 is provided downstream of the second throttling component 43.

The outlet of the first flow path 40 communicates with the third flow path inlet of the third flow path 45 to deliver the hydraulic fluid discharged from the pressure regulating valve X to the storage member 2 through the third flow path 45 .

The pressure regulating system 3 further includes a fourth flow path 36, which includes a fourth flow path inlet and a fourth flow path outlet. The fourth flow path inlet is connected to the detection port of the hydraulic motor 1, and the fourth flow path outlet is connected to the second flow path inlet and the third flow path inlet. A third throttling component 38 is provided in the fourth flow path 36.

The fourth flow path outlet of the fourth flow path 36 , the first flow path outlet of the first flow path 40 , the third flow path inlet and the second flow path inlet of the third flow path 45 meet at point H.

The drilling rig further comprises a filter component 37 for filtering the hydraulic fluid output from the detection port of the hydraulic motor 1 to prevent impurities in the hydraulic fluid output from the detection port from entering the pressure regulating valve 4, thereby ensuring the normal operation of the pressure regulating valve 4.

The hydraulic fluid output from the detection port of the hydraulic motor 1 first flows through the filter component 37 and then flows through the third throttling component 38. The third throttling component 38 is used to filter and reduce the pressure of the hydraulic fluid output from the detection port.

When the hydraulic fluid reaches H, part of the hydraulic fluid is delivered to the storage component 2 through the second throttling component 43 and the second one-way valve 44, thereby further eliminating the pressure fluctuation of the hydraulic fluid and slowing down the introduction of the pressure of the pressure regulating valve X; part of the hydraulic fluid is filtered and reduced in pressure again through the first throttling component 42, and then reaches the pressure regulating valve X.

The first throttling component 42 is connected in parallel with the first one-way valve 39 to form a one-way throttling structure, so that when the load pressure of the hydraulic motor 1 reaches the X port, the function of slow opening and fast closing is realized, ensuring that when the pressure regulating valve is not in operation, the pressure in the control fluid chamber 35 is quickly released through the first one-way valve 39, the second throttling component 43, and the second one-way valve 44.

According to another aspect of the present application, this embodiment further provides an engineering vehicle, which includes a vehicle body and a drilling rig installed on the vehicle body, and the drilling rig is the drilling rig mentioned above.

The above description is only an exemplary embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. A drilling machine, characterized in that it comprises: A hydraulic motor (1) is used to drive a drilling tool screwed into a formation to rotate, the hydraulic motor (1) having a detection port for outputting a hydraulic fluid reflecting the magnitude of its load; A hydraulic drive element (7) for applying pressure to the drilling tool toward the formation; a pump for supplying hydraulic fluid to the hydraulic drive element (7); and The pressure regulating valve (4) comprises a pressure regulating valve inlet ( _P1 ) connected to the pump, a pressure regulating valve outlet ( _A1 ) connected to the hydraulic drive element (7), and a pressure regulating valve control port (X) for introducing a hydraulic fluid for adjusting the opening of the pressure regulating valve (4). The pressure regulating valve control port (X) is connected to a detection port of the hydraulic motor (1) to introduce the hydraulic fluid output from the detection port. The opening of the pressure regulating valve (4) can change inversely with the pressure change of the hydraulic fluid output from the detection port. As the pressure of the hydraulic fluid in the hydraulic motor (1) increases, the opening of the pressure regulating valve (4) decreases accordingly, thereby increasing the pressure loss from the inlet (P1) to the outlet (A1) of the pressure regulating valve (4), so that the pressurized pressure input to the hydraulic drive element (7) decreases. The pressure regulating valve (4) comprises: A valve body provided with the pressure regulating valve inlet (P1) and the pressure regulating valve outlet (A1), comprising a first chamber communicated with the pressure regulating valve inlet (P1) and the pressure regulating valve outlet (A1); A valve core (24) is movably disposed in the first chamber to change the opening of the pressure regulating valve (4); a control fluid chamber (35) communicating with the pressure regulating valve control port (X) for introducing a hydraulic fluid for pushing the valve core (24) toward a first direction; and The elastic component (19) is used to push the valve core (24) toward a second direction, the second direction being opposite to the first direction. The control fluid chamber (35) is formed on the outer peripheral surface of the valve core (24), the area of the first end surface (M1) of the control fluid chamber (35) is larger than the area of the second end surface (M2), wherein the second end surface (M2) and the first end surface (M1) are arranged in sequence along a first direction, The valve body comprises a base body (8) provided with a second chamber and a valve sleeve (9), wherein the valve sleeve (9) is sleeved in the second chamber and is detachably connected to the base body (8), and the first chamber is formed in the inner cavity of the valve sleeve (9). The base (8) of the valve body is provided with a first hole (12) communicating with the pressure regulating valve inlet (P1) of the pressure regulating valve (4) and a second hole communicating with the pressure regulating valve outlet (A1). The valve sleeve (9) is provided with a third hole (11) communicating with the first hole (12) and a fourth hole (10) communicating with the second hole. The valve core (24) is provided with a first annular groove (31) for communicating with the third hole (11) and a second annular groove (30) for communicating with the fourth hole (10). The valve core (24) is configured such that during the movement, the opposing surfaces of the first annular groove (31) and the third hole (11) change, or the opposing surfaces of the second annular groove (30) and the fourth hole (10) change, thereby changing the opening of the pressure regulating valve (4). The first end of the elastic component (19) is in contact with the valve core (24), and the second end of the elastic component (19) is provided with a limit component (14). The pressure regulating valve (4) further comprises a threaded drive mechanism for pushing the elastic component (19) and for adjusting the force of the elastic component (19) pushing the valve core (24). The threaded drive mechanism comprises a screw rod (16) threadably matched with the limiting component (14), the screw rod (16) abutting against the second end of the elastic component (19), and adjusting the force of the elastic component (19) pushing the valve core (24) during the process in which the screw rod (16) is configured to rotate relative to the limiting component (14). 2. The drilling machine according to claim 1, characterized in that the valve body further comprises: A third chamber (13), which is in communication with the first chamber and is used to arrange the elastic component (19) therein; and A drain port is communicated with the third chamber (13) and is used to discharge the hydraulic fluid in the third chamber (13). 3. The drilling machine according to claim 2, characterized in that a flow channel (21) connecting the third chamber (13) and the drain port is provided on the valve core (24). 4. The drilling machine according to claim 1, further comprising: Storage components (2); a first flow path (40) comprising a first flow path inlet for communicating with the pressure regulating valve control port (X) and a first flow path outlet for communicating with the storage component (2) so as to discharge hydraulic fluid for adjusting the opening of the pressure regulating valve (4) when the pressure regulating valve (4) increases its opening; and The second flow path (41) comprises a second flow path inlet for connecting to the detection port of the hydraulic motor (1) and a second flow path outlet for connecting to the control port (X) of the pressure regulating valve, so as to feed back the pressure of the hydraulic fluid inside the hydraulic motor (1) to the control port (X) of the pressure regulating valve, wherein the flow resistance of the first flow path (40) is smaller than the flow resistance of the second flow path (41). 5. The drilling machine according to claim 4, characterized in that: A first one-way valve (39) is provided in the first flow path (40); and/or A first throttling component (42) is provided in the second flow path (41). 6. The drilling machine according to claim 4, further comprising: a third flow path (45), comprising a third flow path inlet for communicating with a detection port of the hydraulic motor (1) and a third flow path outlet for communicating with the storage component (2); and The second throttle component (43) is provided in the third flow path (45). 7. The drilling machine according to claim 6, characterized in that the first flow path outlet of the first flow path (40) is connected to the third flow path inlet. 8. The drilling machine according to claim 7, characterized in that it also includes a fourth flow path (36), the fourth flow path (36) includes a fourth flow path inlet and a fourth flow path outlet, the fourth flow path inlet is connected to the detection port of the hydraulic motor (1), and the fourth flow path outlet is connected to the second flow path inlet and to the third flow path inlet. 9. An engineering vehicle, characterized by comprising: the vehicle body; and The drilling machine according to any one of claims 1 to 8, mounted on the vehicle body.