RU2003849C1 - Hydraulic drive of working members of lopping crosscutting machine - Google Patents

Abstract

SUMMARY OF THE INVENTION: piston cavities of hydraulic cylinders (HZ) of a length measuring device are connected through corresponding hydraulic distributors to a hydraulic pump and a drain. The stock cavity of the HZ saw mechanism is communicated through a hydraulic lock with the outlet of the hydraulic pump. The stock cavities of the GC of the length gauge device are interconnected with each other and the stock cavity of the GC of the saw mechanism. The area of the inlet is equal to the cross-sectional area of the guide valve. The hydraulic lock is adjustable, the control valve of the safety-overflow valve of the hydraulic pump is equipped with a time relay that provides a delay determined by the time the saw mechanism and the length gauge rise to their original position. 2 cpfs, 1 silt

Description

FIELD OF THE INVENTION This invention relates to forestry equipment and can be used in self-propelled machines for trimming knots and cutting.

A delimbing-cutting chewing machine is known, comprising a pivot beam on which a gripping-delimbing head, a saw body, tilting stops for cutting lengths of assortments, a dragging device and a drive of working bodies are mounted.

A disadvantage of the known machine is the lack of a device for holding the folding stops of the length gauge and the saw body in the raised position during the pulling of the wood to be processed, which reduces the reliability of the machine.

Also known is the design of the delimbing and cutting machine L0-120, which is commercially available and selected as a prototype. The machine contains a drive of working bodies, including a hydraulic pump with a safety overflow valve, hydraulic distributors, connecting pipelines, a saw turning cylinder, a turning cylinder for measuring lengths. The piston cavities of the hydraulic cylinders are connected through the corresponding control valves to the drain pipe. The rod cavities of the hydraulic cylinders are connected to the pressure hydraulic line through hydraulic locks, which are connected by hydraulic lines to the control valves and provide retention of the folding stops for measuring the lengths and the saw mechanism in the raised position.

A drawback of this drive is the design and control complexity. This is because the design of the hydraulic lock has two chambers, and to control the operation of the hydraulic locks, additional hydraulic lines are connected to the control valves. All this complicates the design of the drive and its control.

In addition, the hydraulic drive does not automatically return to the initial position of the saw mechanism and the device for measuring lengths. When cutting trees, the rise of the saw mechanism and the measurement of the lengths to the initial position are controlled by the operator by turning on the control valve handle. This complicates the control of the hydraulic drive of the working bodies of the delimbing-cutting machine.

The aim of the invention is to simplify the hydraulic drive.

The goal is achieved. that a hydraulic actuator containing a hydraulic pump, hydraulic valves, safety overflow valve, -

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a pan with a control valve, the hydraulic cylinders of the saw mechanism and the device for measuring lengths, the piston cavities of which are respectively connected through the hydraulic valves to the drain hydraulic line, and the rod cavities are connected to the pressure hydraulic line through a hydraulic lock, equipped with an additional hydraulic line that connects the rod cavities of the hydraulic cylinders of the length measuring device and the saw hydraulic cylinder mechanism and is connected to a pressure hydraulic line with a hydraulic lock, which is made in the form of a check valve, a cat-valve above the valve cerned communicated with the atmosphere, and the area is the area of the inlet valve guide.

In order to increase the reliability of the hydraulic drive, the hydraulic lock is made adjustable.

In order to simplify the control of the hydraulic actuator by automatically returning the saw mechanism and the length gauge to the initial position, the control valve of the hydraulic overflow valve of the hydraulic pump is equipped with a time relay that provides a delay determined by the time the saw mechanism and length gauge rise to their original position.

In the prototype, to maintain the saw mechanism and device for measuring lengths in the raised position, a hydraulic lock is installed for each working element. The control of the hydraulic locks is carried out by hydraulic distributors, each of which is connected by hydraulic lines to the corresponding hydraulic lock. This complicates the hydraulic drive. In addition, in the differential circuit for turning on the hydraulic cylinders, only an unloaded hydraulic lock is used, which has a complex structure and high cost, which also complicates the hydraulic drive.

Unlike the prototype, the proposed design of the hydraulic lock and the circuit of its connection to the hydraulic cylinders ensure that the saw mechanism and the device for measuring lengths in the raised position are kept with only one hydraulic lock of a simple design and allow to exclude a number of hydraulic lines. The hydraulic lock is controlled by a fluid flow.

In addition, the distinguishing features of the claimed hydraulic drive provide automatic return to the initial position of the device for measuring lengths and saw mechanism

A controllable valve design is known in accordance with a. No. 422906 is complex and does not provide complete tightness and therefore cannot be used in the proposed solution as a hydraulic lock. The operation of the hydraulic lock is carried out by an electromagnetic three-line two-position valve.

The propeller does not know the hydraulic drive schemes of delimbers and chewing machines similar to the one claimed.

The foregoing allows us to conclude that the claimed differences, together with other features of the object, give the proposed technical solution a number of new properties that the known technical solutions do not possess. therefore, are essential.

The drawing shows a diagram of the proposed hydraulic drive.

The hydraulic drive of the working bodies of the delimbing-cutting chewing machine contains a hydraulic pump 1, a safety overflow valve 2, controlled by a hydraulic distributor 3, hydraulic cylinders 4 and 5 of the device used to freeze lengths and hydraulic cylinder 7 of the saw mechanism 8.

In the neutral position of the control valves 9, 10, the piston cavities of the hydraulic cylinders 4 and 5 and the hydraulic cylinder 7 are connected through the spools of the hydraulic control valves 9, 10 to the drain hydraulic line 11, respectively, by hydraulic lines 12-14. The rod cavities of the hydraulic cylinders 4 and 5 are connected by an additional hydraulic line 15 to the rod cavities of the hydraulic cylinder 7 of the saw mechanism 8. The additional hydraulic line 15 is connected to the pressure hydraulic line 16 through a hydraulic line. 17 and the hydraulic lock 18. The hydraulic lock 18 is made in the form of a check valve, and the area of the inlet 19 is equal to the area of the guide valve 20. The valve is connected to the atmosphere 21 and a spring 22 is installed in it, adjustable by means of gaskets 23. The hydraulic distributor 3 is equipped with a relay 24 time

The operation of the drive is as follows.

After gripping the tree in the delimbing head, the length of the sawn log is evaluated and selected. To do this, turn on the valve 9 and lower the device 6 to measure the lengths. Simultaneously with turning on the control valve 9, the control valve 3 is turned on and the working fluid from the hydraulic pump 1 is supplied via the pressure control line 16 through the control valve 0 to the 12 hydraulic line

the piston cavity of the hydraulic cylinder 4. and also the inlet 19 of the hydraulic lock 18. The valve 20 of the hydraulic lock 18. overcoming the force of the spring 22, is moved by connecting the pressure hydraulic line 16 to the hydraulic line 17. 15 and the rod cavity of the hydraulic cylinder 4. In this way, the inclusion

a differential cylinder 4 and a length measuring device 6 is lowered. In this case, part of the working fluid from the hydraulic pump 1 enters the tank through the valve 2. After moving the tree to the stop of the device b, the saw mechanism 8 is pushed and sawed

wood, for which include a control valve 10. The working fluid from the pump 1 through the pressure hydraulic line 16 through the control valve 10 through the hydraulic line 14 enters the piston cavity of the hydraulic cylinder 7

saw mechanism 8, and the rod cavity of the hydraulic cylinder 7 is connected to the pressure hydraulic line 16 through the hydraulic line 17 and the open hydraulic lock 18. The hydraulic cylinder 7 is switched on by differential

diagram and sliding of the saw mechanism 8. After the sawing operation is completed, the saw mechanism 8 and the length measuring device 6 are retracted. For this purpose, the control valves 9. 10 are brought into the neutral position and the working fluid from the pump 1 via the pressure hydraulic line 16 through the hydraulic lock 18 of the hydraulic line 17, 15 enters the rod cavities of the hydraulic cylinders 7.4, and the drain from the piston cavities of the corresponding hydraulic cylinders is directed along the hydraulic line 14. 12, control valves 10.9 to the drain hydraulic line 11 The hydraulic cylinders 4 and 7 return the device 6 of the measuring lengths and the sawing mechanism 8 to their original position.

The return of the device for measuring the lengths and the saw mechanism occurs automatically due to the delay of the pressure drop on the safety relief valve 2. Control of which is carried out

hydrodistributor 3, equipped with a relay 24 times.

The pressure drop delay time is selected from the condition of the rise time of the saw mechanism 8 and the length measuring device 6.

In order to reliably hold the length gauge and the saw mechanism in its original position when the hydraulic pump 1 is operated on other machine parts (not shown in the drawing), the response pressure of valve 20 of the hydraulic lock 18 is regulated by installing gaskets 23 under the spring 22. The setting pressure of the hydraulic lock is selected more than the pressure arising in rod cavities x hydraulic cylinders by weight

the device froze the lengths and the saw mechanism in its original position.

The proposed drive greatly simplifies the design of delimbing-cutting hydraulic drive and simplifies the control of the hydraulic drive.

(56) Forest industry. M., ed. Forest Industry, No. 3, 1989. p.

washing machines, increases the reliability of 5 14-15.

Claims (3)

The claims 1, a hydraulic drive of the working bodies of the delimbing-cutting machine, containing a hydraulic pump, a hydraulic valve, a safety and overflow valve with a control valve, a saw cylinder and two hydraulic cylinders of the device for frost-free lengths, the piston cavities of which are connected to the hydraulic cylinder and the hydraulic valve the saw mechanism is communicated through a hydraulic lock with the outlet of the hydraulic pump, characterized in that that, in order to increase reliability by simplifying the design of the hydraulic lock, the rod cavities of the hydraulic cylinders of the length measuring device are in communication with each other and with the rod cavity of the hydraulic cylinder of the saw mechanism, In this case, the overvalve cavity of the hydraulic lock is in communication with the atmosphere, and the area of the inlet is equal to the cross-sectional area of the guide valve. 2. The hydraulic actuator according to claim 1, characterized in that the hydraulic lock is adjustable. 3. The hydraulic actuator according to claim 1, characterized in that, in order to simplify the control of the hydraulic actuator by providing automatic return to the initial position of the saw mechanism and the device for measuring lengths, the control valve of the safety-overflow valve of the hydraulic pump is equipped with a time relay that provides a delay determined by the time of lifting the saw mechanism and the device for measuring lengths to the starting position.