KR100240092B1 - A locking device of operating apparatus for construction heavy equipment - Google Patents

Abstract

It is to prevent sagging of working equipment by self weight of working equipment when working equipment such as boom, arm, etc. of construction equipment is stopped.

According to a preferred embodiment, a valve block and a control valve for controlling the actuator drive by adjusting the flow direction and the amount of hydraulic oil supplied to the actuator when the spool switching is mounted so as to be movable in the left and right directions on the valve block A locking device for a work device for construction equipment, comprising: a cylindrical case mounted on the valve block so as to be in communication with the actuator side flow path and a discharge flow path of a hydraulic pump; And a means for controlling the deflection of the work device by the self-weight of the work device by intermitting the operating pressure from the actuator to the tank according to the spool switching of the control valve. Provides a locking device for the device.

This reduces the volume of the valve, which prevents the work device from sagging due to the weight of the work device when it stops while the work device such as the boom or arm of the construction equipment is in operation. It prevents the leakage of oil during operation through the gap of the contact surface portion of the valve, thereby preventing the safety of the equipment from falling, thereby increasing the reliability of the equipment.

Description

Locking device for work equipment for construction equipment

The present invention relates to a locking device for a work device for construction equipment, and more particularly, to prevent sagging of the work device by the weight of the work device when the work device is stopped during operation of the boom, arm, etc. of the construction equipment. A locking device for a work device for heavy equipment.

As schematically shown in FIG. 1, the locking device structure of the working device for heavy construction equipment according to the prior art is a control valve 1a for controlling hydraulic oil supplied to a hydraulic cylinder for driving a working device such as an boom and an arm of an excavator. ), A first valve block (1) in which the first valve block (1) is installed, and the flow path (10) of the above-described first valve block (1) and the port of the hydraulic cylinder for driving the above-mentioned working device are mounted outside the first valve block (1). A second valve block (2) on which a poppet (3) for selectively communicating (9) is communicated, and an operating pressure for mounting the outside of the second valve block (2) and for switching the above-described poppet (3). And a third valve block (4) formed with an inlet port (6) and a drain port (7) for supplying and returning a pilot pressure for driving the spool (5) for controlling the pressure.

Referring to the operation of the locking device of the work device for construction equipment configured as described above, the lowering pressure due to the weight of the work device driving hydraulic cylinder when the work device such as the boom, arm, etc. of the excavator is stopped during operation is connected to the above-described hydraulic cylinder. It is transmitted to the port 9 formed in the above-described second valve block (2) so as to pass through the orifice 11 formed in the above-mentioned second valve block 2 (Back) of the poppet (3) described above (Back) Pressure is delivered to the chamber.

At this time, since the above-mentioned poppet 3 acts in the closing direction (lower direction on the drawing) by the cross-sectional area of the sheet and the back chamber of the above-described poppet 3, the port formed in the above-mentioned second valve block 2 ( The operating oil flowing through 9 is blocked from being transmitted to the flow path 10 formed in the above-described first valve block 1. Therefore, the work device is prevented from sagging even when stopped during work.

When the pilot pressure Pi is transmitted to the inlet port 6 through which the pilot signal pressure formed in the above-described third valve block 4 is supplied, the spool 5 embedded in the above-described third valve block 4 The position member is moved to the left in the drawing in excess of the pressure set by the elastic member 8 to a predetermined pressure. At this time, the pressure of the back chamber of the above-mentioned poppet 3 is connected to the above-described drain port 7 along the notch of the above-mentioned spool 5 to a low pressure state.

Therefore, the lowering pressure of the port 9 of the second valve block 2 described above moves the poppet 3 above in the drawing upwards, and thus through the flow path 10 of the first block 1 described above. As it is connected to the tank passage T side of the first valve block 1, the working pressure is gradually lowered by releasing the holding pressure.

However, as the second valve block 2 and the third valve block 4 are processed into separate parts for the first valve block 1 described above, and then assembled, the cost increase due to the increase in the working time. In case of assembling and mounting the second valve block 2 and the third valve block 4 described above with respect to the above-described first valve block 1, the oil-retaining O-rings 12 and 13 on their contact surfaces ) Is leaked through the gap of the contact surface when the O-ring (12) (13) is damaged as described above, thereby causing a problem that the safety of the equipment is lowered.

In addition, the aforementioned second valve block 2 is mounted to the outside of the aforementioned first valve block 1, and the aforementioned third valve block 4 is mounted to the outside of the second valve block 2. As a result, the overall volume of the valve has a problem.

Accordingly, an object of the present invention is to reduce the volume of the valve to prevent sagging of the work device due to the weight of the work device when the work device such as the boom, arm, etc. of the construction equipment is stopped during operation, thereby improving the processing and assembling properties. It is to provide a locking device of the work equipment for heavy equipment to reduce the cost.

It is another object of the present invention to provide a locking device for a heavy duty worker's device for preventing the leakage of oil during operation through a gap in the contact surface of the valve, thereby increasing the reliability of the equipment by preventing the safety of the equipment from falling. will be.

1 is a cross-sectional view of the locking device of the working device for heavy construction equipment according to the prior art.

2 is a cross-sectional view of the locking device of the working device for heavy equipment according to an embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

21: hydraulic pump discharge flow path 22: actuator side flow path

23: first poppet valve 24: elastic member

25: 2nd poppet valve 26: cylindrical case

27: piston 28: pilot pressure port

29,34: drain ball 30: valve block

31: Orifice 32: Guide clearance

35 tank

An object of the present invention described above, a control valve for controlling the actuator drive by adjusting the flow direction and the amount of the hydraulic fluid supplied to the actuator at the time of switching the valve block and the spool is mounted so as to be movable in the left and right directions on the valve block A locking device for a work device for construction equipment, comprising: a cylindrical case mounted on the valve block so as to communicate with the actuator side flow path and a discharge flow path of the hydraulic pump; And a means for controlling the lowering of the work device by the self-weight of the work device by intermitting the operating pressure from the actuator to the tank according to the spool switching of the control valve. By providing a locking device for the cost work tool.

According to a preferred embodiment, the means is fixed to one side of the cylindrical case so as to open and close the actuator side flow path and the discharge flow path of the hydraulic pump, and by the operating pressure from the actuator when the work device is stopped during operation. A first poppet valve which switches the actuator side flow path which is switched to communicate with the discharge flow path of the hydraulic pump and prevents sagging of the work device due to the weight of the work device when the switch of the control valve is switched; It is mounted inside the valve, and the first poppet valve is switched by the high pressure operating pressure generated in the actuator-side flow path to convert the operating pressure of the actuator side through the discharge flow path of the hydraulic pump when switching the control valve And a second poppet valve for returning to the tank to lower the work device by its own weight.

According to a preferred embodiment, the first poppet valve is formed at right angles to the spool of the control valve.

According to a preferred embodiment, it is mounted between the inner bottom surface of the first poppet valve and the second poppet valve opposite thereto, and pressurizes the second poppet valve to close the hydraulic oil discharge hole formed at a predetermined position of the cylindrical case. An elastic member for elastically biasing the state to an initial state is provided.

According to a preferred embodiment, the first poppet valve is formed on the first poppet valve so as to communicate with the actuator side flow path, and the first poppet valve is switched to the high pressure operating pressure generated in the actuator side flow path to the discharge flow path of the hydraulic pump. An orifice for blocking the actuator side flow path is provided.

According to a preferred embodiment, mounted on the cylindrical case other side, the pilot pressure of the operator value is switched at the time of supply through the pilot port of the cylindrical case to switch the second poppet valve to the high pressure of the actuator-side flow path It is provided with a piston for returning the working oil in the state to the tank.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, which are not intended to limit the technical scope of the present invention.

2 is a cross-sectional view of the locking device of the working device for heavy equipment according to an embodiment of the present invention.

As shown in FIG. 2, according to a preferred embodiment of the present invention, the valve block 30 and the valve block 30 are internally installed so as to be movable in the left direction when the pilot signal pressure is supplied to a predetermined position inside the valve block 30. The control valve (C) in which the spool (S) for controlling the actuator operation described above is installed by adjusting the amount and flow direction of the hydraulic oil supplied to the actuator (hydraulic cylinder), and the valve block (30) described above The cylindrical case 26 is mounted so as to communicate with the actuator side flow passage 22 and the discharge passage 21 of the hydraulic pump, and the cylinder case 26 is tactically stopped during operation of a work device such as a boom or an arm. Means for controlling the deflection of the above-mentioned working apparatus by the self-weight of the above-mentioned working apparatus by intermittently returning the operating pressure from one actuator to the tank 35 in accordance with the above-mentioned switching of the spool S of the control valve C. Is mounted.

The means for controlling the deflection of the above-mentioned working apparatus is mounted on one side of the cylindrical case 26 so as to open and close the actuator-side flow passage 22 and the discharge passage 21 of the hydraulic pump. The actuator-side flow path described above, which is switched by the operating pressure from the actuator described above when the device is stopped during operation, and communicates with the discharge passage 21 of the hydraulic pump described above when the spool S of the control valve C is switched. 22 is mounted inside the first poppet valve 23 and the first poppet valve 23 for preventing sagging due to the weight of the above-described work device, and the above-described actuator-side flow path 22. The above-mentioned first poppet valve 23 is switched by the high-pressure operating pressure generated in the above, and when the spool S of the control valve C is switched, the operating pressure on the actuator side is discharged from the hydraulic pump. The above-mentioned operation by returning to the tank 35 via the flow path 21 And a second poppet valve 25 for lowering the device by its own weight.

The second poppet valve 25 is pressed between the inner bottom surface of the first poppet valve 23 and the aforementioned second poppet valve 25 to the predetermined position of the cylindrical case 26. An elastic member 24 is elastically biased to an initial state in which the formed working oil discharge hole 26a is closed. The first poppet valve 23 is switched to the first poppet valve 23 described above so as to communicate with the actuator side flow passage 22 by the high pressure operating pressure generated in the actuator side flow passage 22. The orifice 31 which cuts off the actuator side flow path 22 with respect to the discharge flow path 21 of one hydraulic pump is formed.

The pilot pressure Pi of the working device is switched to the other side of the cylindrical case 26 through the pilot port 28 of the aforementioned cylindrical case 26 to switch the aforementioned second poppet valve 25. And a piston 27 for returning the high-pressure hydraulic oil of the actuator-side flow passage 22 to the tank 35.

In this case, the aforementioned first poppet valve 23 may be formed at a right angle with respect to the spool S of the control valve C described above.

Referring to the method of using the locking device of the work device for construction equipment according to the present invention configured as described above, when the work device is stopped while driving the work device of the arm, such as an excavator, the boom, lowering due to the weight of the work device described above The pressure is transmitted from the hydraulic cylinder for driving the work device described above to the flow passage 22 connected thereto, and then passes through the orifice 31 formed in the first poppet valve 23 described above, and thus the first poppet valve 23 described above. It passes through the guide gap 32 between the second poppet valve 25 is transmitted to the back chamber of the first poppet valve 23 described above.

Therefore, the first poppet valve 23 is switched by the cross-sectional area of the first poppet valve 23 with the inlet side of the first sheet, and is moved in the right direction in the drawing. When switching the spool (S) of the control valve (C) for controlling the hydraulic fluid supplied to the shut off the discharge flow path 21 of the hydraulic pump communicated to the tank (35) side. In the second poppet valve 25 described above, the second poppet valve 25 is strongly in contact with the aforementioned sheet 33 due to the front and rear cross-sectional area difference in the sheet 33 of the cylindrical case 26 described above. By blocking the hydraulic oil discharge hole 26a formed in the aforementioned cylindrical case 26, the hydraulic oil introduced into the inside is not leaked to the leak and the tank 35.

Therefore, it is possible to prevent sagging of the work device due to the weight of the work device described above when the work device such as the boom or the arm stops during the work.

On the other hand, when releasing the stop of the above-described work device, when the pilot signal pressure Pi of the work device is supplied through the above-described pilot port 28, the piston built in the aforementioned cylindrical case 26 ( 27) to shift the position to the right in the drawing. At this time, the pressure P for switching the piston 27 described above is calculated by the following equation.

P = (cross-sectional area of piston) x (pilot signal pressure Pi) = (elastic coefficient of elastic member) + (sheet cross-sectional area of second poppet x hydraulic cylinder pressure (Pp).

That is, the pressure P for switching the piston 27 described above is the ratio of the sheet cross-sectional area of the aforementioned second poppet valve 25 to the cross-sectional area of the piston 27 described above, which is applied to the aforementioned pilot port 28. Even when the pilot pressure supplied is small, the above-mentioned second poppet valve 25 can be switched to the right direction. At this time, the high pressure formed inside the first poppet valve 23 described above is transferred to the cylindrical case 26 via the sheet 33 through the hydraulic oil discharge hole 26a of the cylindrical case 26 described above. After passing through the formed drain hole 34, the drain hole 29 formed in the aforementioned valve block 30 is supplied to the tank 35 of the aforementioned valve block 30.

Therefore, the high-pressure hydraulic oil supplied to the above-described oil passage 22 connected to the above-described hydraulic cylinder moves the above-mentioned first poppet valve 23 to the left in the drawing, and the above-described discharge passage 21 of the hydraulic pump. By returning to the above-mentioned tank 35 at the time of switching the above-mentioned spool (S) of the control valve (C) via)) the working device is to be lowered by its own weight.

As described above, according to a preferred embodiment, by reducing the volume of the valve to prevent sagging of the working device by the weight of the working device when the working device, such as the boom, arm, etc. of the heavy equipment stops during operation, the workability and assembly. It can improve the cost, thereby reducing the cost, prevent leakage through gaps in the contact surface of the valve and thereby increase the reliability by preventing the safety of the equipment is lowered.

Claims (5)

A work block for construction equipment having a valve block and a control valve for controlling the actuator driving by adjusting the flow direction and the amount of hydraulic oil supplied to the actuator during the switching of the spool mounted so as to be movable in the left and right directions on the valve block. In the locking device: A cylindrical case mounted to the valve block to communicate with the actuator side flow path and the discharge flow path of the hydraulic pump; And mounted on the cylindrical case and controlling the deflection of the work device by the self-weight of the work device by intermitting that the operating pressure from the actuator returns to the tank according to the spool switching when the work device is stopped during operation. Locking device of the working device for heavy construction equipment, characterized in that it further comprises a means for. The method of claim 1, wherein the means; One side of the cylindrical case is mounted to open and close the actuator side flow path and the discharge flow path of the hydraulic pump, and is switched by the operating pressure from the actuator when the working device is stopped during operation. A first poppet valve for blocking the actuator side flow path communicating with the discharge flow path of the hydraulic pump to prevent sagging of the work device due to the weight of the work device; And The first poppet valve is mounted to the inside of the first poppet valve, and the first poppet valve is switched by a high pressure operating pressure generated in the actuator-side flow path to discharge the hydraulic pressure from the actuator side when the switch of the control valve is switched. And a second poppet valve for returning to the tank via a flow path to lower the work device by its own weight. According to claim 2, It is mounted between the inner bottom surface of the first poppet valve and the second poppet valve opposed to the pressure, and pressurizing the second poppet valve to close the hydraulic oil discharge hole formed in the predetermined wing of the cylindrical case Locking device of the working device for heavy construction equipment, characterized in that it further comprises an elastic member for elastically biasing the state to the initial state. According to claim 2, It is formed in the first poppet valve to communicate with the actuator side flow path, by switching the first poppet valve to the high pressure operating pressure generated in the actuator side flow path to the discharge flow path of the hydraulic pump And an orifice for blocking the actuator side flow path. The cylinder case is mounted on the other side of the cylindrical case, the pilot pressure of the working device is switched to the idle through the pilot port of the cylindrical case to switch the second poppet valve of the actuator-side flow path And a piston for returning the hydraulic oil to the tank under high pressure.

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