JPH0421016B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention relates to a hydraulic or electro-hydraulic remote control device for construction machinery.

[Conventional device]

An example of a conventional hydraulic remote control device will be described with reference to FIG. The actuator 11 sucks oil from the tank 12 and the pressure oil from the main pump 14 whose maximum pressure is controlled by the relief valve 13 is connected to the check valve 15.
and is connected via a control valve 16. 17 is a discharge amount control mechanism that controls the discharge amount of the main pump 14. The oil chambers 18 and 19 on both sides of the control valve 16 are supplied and discharged with pressure oil from a pilot pump 21 whose maximum pressure is controlled by a relief valve 20 via a pilot pressure reducing valve 23 located in an operator's cab 22. By switching the control valve 16, the actuator 11
Pressure oil is supplied to and discharged from the pump 14. Although the control valve 16 of the actuator 11 is adjusted by the pilot pressure reducing valve 23, the discharge amount control mechanism 17 is similarly adjusted by another pilot pressure reducing valve (not shown).

FIG. 4 shows the details of the oil chambers 18 and 19 of the control valve 16. Both ends of the spool 26 pass through the valve body 27 and protrude into the cover 28, and its small diameter portion is fitted with a pair of washers 29. A spring 30 is stretched through the spring 30. Therefore, when the pilot pressure reducing valve 23 is tilted to the right, the secondary pressure of the pilot pressure valve 23 flows through the hole 31 of the cover 28 on the left side, and the spool 2
6 moves to the right against the spring 30 on the right side, and the pressure oil of the pump 14 flows into the head side of the actuator 11. Here, assuming that the diameter of the spool 26 is D stroke 1 and D=2.5 cm and 1 cm, the flow rate q from the pilot pressure reducing valve 23 required for the stroke of the spool 26 is 4.9 cc.

In such a configuration, when adjusting the stroke of the control valve 16 or adjusting the discharge amount control mechanism 17, the amount of operating oil is adjusted to, for example, the oil chamber 18 or 1 through the pilot pressure reducing valve 23 operated by the operator.
9, therefore, if the control valve 16 and the pilot pressure reducing valve 23 in the operator's cab 22 are located far apart, the pilot piping becomes long, resulting in a delay in response. Here, if the size of the pilot pressure reducing valve 23 is increased in order to improve responsiveness, there is a drawback that the operating force becomes heavy and operation becomes difficult.

As shown in FIG. 5, the conventional electric-hydraulic remote control device has an electromagnetic proportional pressure reducing valve 37 connected to the oil chamber 18 or 19 by a controller 36 and controlled by a solenoid 39 (in the figure, only the oil chamber 18 side is connected to the oil chamber 18 or 19). control). Note that 38 is a battery. With this configuration, controller 3
6 to the left side, the electromagnetic proportional control valve 37 is energized, thereby sending the pressure oil of the pilot pump 21 to the oil chamber 18 of the control valve 16 and allowing the pressure oil of the pump 14 to flow into the head side of the actuator 11. In such a configuration, a relatively large amount of secondary pressure oil from the electromagnetic proportional pressure reducing valve 37 having a relatively small size, that is, a small capacity, is used as described in the explanation of FIG. 4 above.
The response was poor because the spool 26 was moved, which required a flow rate of 4.9cc.

[Purpose of the invention]

The present invention eliminates these drawbacks, and its purpose is to provide a remote control device that has good responsiveness and light operating force for hydraulic type systems, and has good responsiveness for electric-hydraulic type systems. There is a particular thing.

[Key points of the invention]

The remote control device of the present invention is characterized by having the following configuration.

A: Actuator that is the main control target B: Control valve that controls supply and discharge of pressure oil to the actuator by movement of the main spool C: Main pump that supplies pressure oil to the control valve D: Externally located at both ends of the main spool The formed pilot hydraulic pressure is connected to the control spool, which is fixed to or integrated with both ends of the main spool and communicates with the two axially perpendicular holes drilled near both ends through the axial holes. A control sleeve that is inserted into the outer circumference and communicates between the inner and outer circumferences through two holes perpendicular to the axis drilled near both ends of the control sleeve, and a pilot piston that moves the control sleeve by receiving pilot pressure oil on one end surface of the control sleeve. A pair of hydraulic servo mechanisms communicate pilot oil pressure to the tank when the control valve is not operating, and restrict communication between the pilot oil chamber and the tank by moving the control sleeve via the pilot piston when the control valve is operating. E: A shaft that is provided between the pilot pump and the hydraulic servo mechanism and has three lands, a hole perpendicular to the axis made in the recess between two of these lands, and a shaft that opens this hole on one end surface of the hole. a selector spool having a hole in the direction and receiving pilot pressure oil on the other end face, a communication hole from the hole into which the selector spool is inserted to the pilot oil chamber, and a pipe connecting the hole to the tank;
It consists of a connection hole that connects the hole to the pilot pump, and a pair of connecting holes that communicate the pilot oil chamber with the tank when the control valve is not operating, and supply pilot pressure oil of the pilot pump to the pilot oil chamber when the control valve is operating. selector.

[Embodiments of the invention]

The present invention will be explained below with reference to FIGS. 1 and 2 showing an embodiment of a hydraulic type. Note that the same members as those in FIG. 3, which is a conventional example, are given the same reference numerals, detailed explanations are omitted, and only different parts will be explained.

In FIG. 1, 51 is a control valve that controls the supply and discharge of pressure oil to the actuator 11, which is the main control target, and only the shape of both ends of the main spool 52 (see FIG. 2) is different from the conventional spool 26. They are different but otherwise the same. 53 is a hydraulic servo mechanism which supplies pressure oil from the pilot pump 21 to the pilot pressure reducing valve 2.
3 through the selector 54 and throttle 105, the control valve 51 is switched.

Next, details of the hydraulic servo mechanism 53 and selector 54 will be explained with reference to FIG. Valve body 6 of control valve 51
A servo case 62 is fixed to both left and right end surfaces of 1 by bolts (not shown). (The figure shows only the right side and shows the neutral state of the control valve 51.) Regarding the hydraulic servo mechanism 53, a collar 63 inserted into the shoulder of the right end of the main spool 52 and a shoulder of the servo case 62 are attached to the hydraulic servo mechanism 53. A spring 65 is provided between the main spool 52 and the retainer 64 to return the main spool 52 to a neutral state. A control spool 66 is provided on the end surface of the main spool 52, either integrally with the main spool 52 or fixed thereto by screwing or the like.

The control spool 66 is slidably passed through the center hole of the retainer 64 and the control sleeve 66 is inserted into the control sleeve 6.
7 is slidably inserted into the center hole 68 of the control sleeve 6 near the end surface of the main spool 52 and the control sleeve 6.
Holes 69 and 70 in the direction perpendicular to the axis are bored in the inside of the hole 7, and both the holes 69 and 70 are communicated with each other by a hole 71 in the axial direction. control sleeve 67
The center hole 68 communicates with the outer periphery through holes 72 and 73A in the direction perpendicular to the axis near both left and right ends.

Between the control sleeve 67 and the retainer 64 is a spring 73 which is weaker than the spring 65 described above.
Also, the right end of the control sleeve 67 is connected to the spring 73.
The pilot piston 74 is pushed into contact with the wall surface of the servo case 62, and is also in contact with one side of a pilot piston 74 inserted into the center of the servo case 62. The other side of the pilot piston 74 faces a conduit 76 connected to a connection port 75 of the servo case 62 connected to one side of the pilot pressure reducing valve 23. In addition, the outer circumference of the control sleeve 67 is connected to the tank 1 by a conduit 77.
It is connected to 2. Note that the space facing the right end of the main spool 52 and the retainer 64 is the pilot oil chamber 7.
It's called 8.

The selector 54 is connected to the control valve 5 of the servo case 62.
A plug 92 placed at the end of a hole 91 drilled from the first side, a selector spool 93 slidably inserted into the hole 91, and a relatively weak spring 94 provided between the plug 92 and selector spool 93. is the main component. The selector spool 93 has three lands 95 to 97, and lands 95 and 96.
A hole 9 in the direction perpendicular to the axis in a recess 98 between the
9 is opened at its left end by an axial hole 100. In the state shown in the figure, the recess 98 is in contact with the other side of the communication hole 101 of the servo case 62, which has one side open to the pilot oil chamber 78, and the left side of the land 95 is in contact with the other side of the communication hole 101 of the servo case 62.
It communicates with the tank 12 by a conduit 102 connected to the tank 7. The right end of the selector spool 93 is the pipe 7
Recess 1 between lands 96 and 97 and in contact with 6
A connection hole 104 provided in the portion facing 03 is connected to the pilot pump 21 via a fixed throttle 105.

Note that the pilot piston 74 and selector spool 93 usually have a diameter of approximately 0.6 cm, and the pipe line 76
When the pilot pump 21 receives pilot pressure oil, the stroke of the pilot piston is 1 cm.
The selector spool 93 is approximately 0.6 cm.

Next, the operation of the above-described embodiment will be explained. Second
The figure shows the neutral state of the control valve 51 as described above, and in this state, the pilot oil chamber 78 communicates with the tank 12 from the holes 69 to 72, which are passages on one side, through the pipe 77, and on the other side. Since hole 101, which is a side passage, communicates with tank 12 via holes 99 and 100 and pipes 102 and 77,
The pilot oil chamber 78 is unpressurized and the main spool 5
2 is in a neutral position by left and right springs 65. When the pilot pressure reducing valve 23 is tilted to the right side, the pilot pressure oil of the pilot pump 21 flows from the connection port 75 of the servo case 62 on the right side to the pipe line 76 as shown in FIG.
It acts on In response to this, selector spool 93
moves to the left, and the pilot pressure oil of the pilot pump 21 flows from the fixed throttle 105 through the recess 103 and the hole 101 into the pilot oil chamber 78, and the communication between the hole 101 and the pipe 102 is cut off, that is, the tank 12 of the pilot oil chamber 78 The passage on the other side that leads to is cut off.

At the same time as the selector spool 93 moves to the left, the control sleeve 67 is also pushed by the pilot piston 74 and moves to the left, and the holes 70 and 72 of the pilot oil chamber 78 leading to the tank 12 are also narrowed. As a result, the pressure in the pilot oil chamber 78 increases, and the main spool 52 moves to the left, receiving the force of a spring in the left servo case corresponding to the spring 65 as the main spool 52 moves to the left.

Here, the pressure in the pilot oil chamber 78 is
2, the main spool 52 stops at a position where the pressure in the pilot oil chamber 78 and the above-mentioned left spring force are balanced. This position is determined by the tilted position of the lever of the pilot pressure reducing valve 23. When the main spool 52 moves to the left, the pilot oil chamber on the left side is in communication with the tank 12 because the selector on the left side is inactive, so that the main spool 52 moves to the left without any problem. As the main spool 52 moves to the left, pressure oil from the main pump 14, which is determined by the position of the main spool 52, flows into the rod side of the actuator 11.

If the pilot pressure reducing valve 23 surrounded by the dashed line in FIG. 1 is replaced with the controller 36, electromagnetic proportional pressure reducing valve 37, and solenoid 39 as the battery 38 shown in FIG. It is understood that this is possible.

〔Effect of the invention〕

As explained above, the remote control device of the present invention has the following features:
Compared to the conventional example, only a small control spool, a control sleeve, a retainer, a selector spool, and three springs are added, so the cost increase is small. On the other hand, the flow rate of the pilot pressure oil of the pressure reducing valve required for switching the main spool of the control valve is 0.28 cc for the pilot piston and 0.17 cc for the selector spool, a total of 0.45 cc, compared to the conventional 4.9 cc.
It became less than 10% of cc. For this reason, the hydraulic type has the advantage of good responsiveness and light operating force, and the electric-hydraulic type has the advantage of good responsiveness.

[Brief explanation of drawings]

Figures 1 and 2 show one embodiment of the present invention, Figure 1 is a system diagram, Figure 2 is an enlarged sectional view of the main part of the present invention, Figure 3 is a system diagram of a conventional example, and Figure 4. 5 is a partial sectional view of a conventional example, and FIG. 5 is a related diagram showing another embodiment of the present invention and a part of another conventional example. 11... Actuator, 14... Main pump, 2
1...Pilot pump, 23...Pilot pressure reducing valve, 37...Solenoid proportional pressure reducing valve, 51...Control valve, 52...Main spool, 53...Hydraulic servo mechanism, 54...Selector, 66...Control spool , 67...control sleeve, 74...
...Pilot piston, 78...Pilot oil chamber, 93...Selector spool.

Claims (1)

[Claims] 1. A remote control device having the following configuration. A: Actuator that is the main control target B: Control valve that controls supply and discharge of pressure oil to the actuator by movement of the main spool C: Main pump that supplies pressure oil to the control valve D: Outside both ends of the main spool a control spool that is fixed to or integrated with both ends of the main spool and communicates with two axially perpendicular holes drilled near both ends through an axial hole; A control sleeve is inserted into the outer circumference of the control spool, and the inner and outer circumferences are communicated through two holes drilled near both ends of the control sleeve in a direction perpendicular to the axis, and the control sleeve is moved by receiving pilot pressure oil on one end surface of the control sleeve. When the control valve is not in operation, the pilot oil chamber is communicated with the tank, and when the control valve is in operation, the control sleeve is moved via the pilot piston, thereby connecting the pilot oil chamber with the tank. A pair of hydraulic servo mechanisms E that restrict communication with the tank: A pair of hydraulic servo mechanisms E are provided between the pilot pump and the hydraulic servo mechanism, and are provided with three lands and a recess in the middle of two of these lands, extending in the direction perpendicular to the axis. a selector spool having a hole and an axial hole opening on one end face of the selector spool and receiving pilot pressure oil on the other end face; and a communication hole extending from the hole into which the selector spool is inserted to the pilot oil chamber. , a pipe line connecting the hole to a tank, and a connection hole connecting the hole to a pilot pump, and when the control valve is not operating, the pilot oil chamber is connected to the tank, and when the control valve is operating, the pilot oil chamber is connected to the tank. a pair of selectors for supplying pilot pressure oil of the pilot pump to the pilot oil chamber;