JPS6350561B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a hydraulic actuator operating device that controls acceleration and deceleration of a hydraulic actuator within a predetermined stroke for a short period of time to operate the hydraulic actuator.

(Prior Art) As shown in FIG. 1, a conventional hydraulic actuator operating device of this type is one in which a hydraulic actuator 1 and a cylinder-type hydraulic pump 4 are directly connected through a pipe 10 so that the working medium oil flows back and forth. is possible.

(Problems and Objectives to be Solved by the Invention) In the hydraulic actuator actuating device shown in FIG. Since it is sealed between the chamber 8 and the chamber 8, and only moves back and forth between the two, it deteriorates after a relatively short period of operation. That is, the lubrication performance deteriorates.

When the hydraulic oil deteriorates, it causes abrasion of various mechanical parts, and especially when the seal parts wear out, oil leakage occurs, so that the hydraulic actuator cannot perform a predetermined stroke operation during forward movement. By the way, if you replace the sealed hydraulic oil with new hydraulic oil, the above-mentioned problems caused by the deterioration of the hydraulic oil will be resolved, but since the hydraulic oil is sealed, when replacing it, the operating state of the hydraulic pump by the rotating cam must be checked. The hydraulic actuator must be forcibly stopped under such conditions, which has the disadvantage of impairing operating efficiency. The present invention has been made to solve the above-mentioned drawbacks, and is designed to automatically replace the hydraulic oil while the device is in operation.

(Solution means and effects according to the present invention) A hydraulic actuator equipped with a force storage double-acting device,
a cylindrical hydraulic pump that is directly connected to the forward movement chamber of the hydraulic actuator through a conduit so that working medium oil flows therethrough, and that has a larger volume than the forward movement chamber;
The rotary cam includes a rotary cam that operates the hydraulic pump, and a power storage restoration device assembled to the piston rod of the hydraulic pump, and the rotary cam has an actuator forward stroke zone, a hydraulic oil relief stroke zone, and an actuator backward stroke zone. A stroke zone and a hydraulic oil replenishment stroke zone are formed in series in this order, and the pipe line includes a pipe line in which a relief valve is inserted, and a pipe line in which the hydraulic oil in the hydraulic oil tank is drained through a check valve after the return movement. Pipes for suctioning and inflowing are connected to each other.

The actuator working medium oil trapped between the hydraulic actuator and the cylinder type hydraulic pump is forcibly relieved after the forward movement of the hydraulic actuator, and is replenished after the backward movement.

(Example) Below, the example will be explained with reference to the drawings.
In FIG. 2, reference numeral 1 denotes a hydraulic actuator, and a pressure accumulator 3 is connected via piping to a reciprocating chamber 2 of the hydraulic actuator. Reference numeral 4 denotes a cylinder-type hydraulic pump, and a spring-type force storage restoring device 6 is attached to its piston rod 5. The power storage restoring device 6 may be an air cylinder 6' shown in FIG. 6. 7 is a rotary cam that operates the cylinder type hydraulic pump 4, and an actuator forward stroke zone A is formed on its curved surface.
-B, a hydraulic oil relief stroke zone BC, an actuator double stroke zone CD, and a hydraulic oil replenishment stroke zone D-A are formed in series in this order. The hydraulic actuator 1
The forward movement chamber 8 of the forward movement chamber and the cylinder chamber 9 of the cylinder type hydraulic pump 4 having a larger volume than the forward movement chamber are connected to the pipe line 1.
At 0, they are directly connected so that the working medium oil can go back and forth. A pipe line 12 in which a relief valve 11 is interposed and a pipe 15 that sucks and inflows the hydraulic oil in the hydraulic oil tank through a check valve 13 after the return movement are connected to the vicinity of both ends of the pipe line 10. .

The set pressure of the relief valve 11 is higher than the normal forward hydraulic pressure of the hydraulic actuator 1.

(Function) Since the present invention is configured as described above, the operation of the hydraulic actuator 1 and the replacement of the hydraulic fluid sealed between the hydraulic actuator 1 and the cylinder type hydraulic pump 4 are performed as follows. That is, when the rotary cam 7 is rotated in the direction of the arrow by the operation of the drive device not shown, the piston 4' of the hydraulic pump 4 is pushed by the rotary cam 7 which is in contact with it via the roller 16, and is pushed against the piston rod 5. Hydraulic oil is discharged from the cylinder chamber 9 while compressing the assembled spring 6. This hydraulic oil flows into the reciprocating chamber 8 of the hydraulic actuator 1 through the conduit 10 and moves the piston 1' to a predetermined stroke, that is, until it comes into contact with the cylinder wall. At this time, the hydraulic fluid in the reciprocating chamber 2 of the hydraulic actuator 1 is sequentially pushed out and flows into the pressure accumulator 3, where the pressure is accumulated. When the rotary cam 7 is further rotated beyond the actuator forward stroke zone A-B, the piston 4' of the hydraulic pump 4 is pushed further and discharges hydraulic fluid from the cylinder chamber 9. This hydraulic fluid does not flow into the actuator forward movement chamber 8 because the piston 1' of the hydraulic actuator 1 has already moved to the stroke end.
Conduit 10→Relief valve 11 through conduit 12
is relieved and returned to the tank 14. When the rotary cam 7 is further rotated and enters the actuator double movement stroke zone C-D, the hydraulic oil accumulated during the forward movement is discharged from the pressure accumulator 3, flows into the actuator double movement chamber 2, and is heated by the piston 1' of the actuator 1. Push back. At this time, actuator 1
The hydraulic oil in the reciprocating chamber 8 is discharged from the chamber 8 by the pushing back motion of the piston 1' and is returned into the hydraulic pump 4 through the conduit 10. Furthermore, when the rotary cam 7 is rotated and enters the hydraulic oil replenishment stroke zone D-A, the piston rod 5 of the hydraulic pump 4 is pushed out by the restoring force of the spring 6, and at the same time, the hydraulic oil flows from the tank 14 to the pipe 15 → the pipe. It is suctioned into the hydraulic pump 4 through the channel 10.

Thereafter, the same operation is repeated. By repeating the above operation, the hydraulic fluid confined between the hydraulic actuator 1 and the hydraulic pump 4 is simultaneously circulated and replaced, albeit slightly.

Therefore, the hydraulic oil can be replaced automatically without stopping the hydraulic actuator 1, and deterioration of the hydraulic oil can be effectively prevented. In the above embodiment, the backward motion of the hydraulic actuator 1 is performed using the accumulated oil in the pressure accumulator 3, but as shown in FIGS. 4 and 5, the actuator 1 is equipped with a spring 18 and an air cylinder 19. A double movement operation may be performed using the accumulated power.

(Effects) As described above, according to the present invention, the hydraulic oil that is being used and is confined between the hydraulic actuator and the cylinder type hydraulic pump can be replaced with new hydraulic oil little by little, thereby eliminating problems caused by deterioration of the hydraulic oil. In addition, since the hydraulic oil is automatically replaced while the equipment is operating, the operating efficiency of the equipment can be greatly improved compared to when the equipment is stopped, and it is also possible to measure the degree of deterioration of the hydraulic oil. Monitoring work is also unnecessary. Furthermore, in the present invention, the hydraulic oil is supplied to the hydraulic pump after the actuator moves back by self-suction, so the low-pressure hydraulic oil replenishing device 20, which is indispensable in the device shown in FIG. 1, has to be wiped out. Therefore, it has many effects such as completely eliminating the possibility that the actuator will operate on the wrong side due to failure or failure of the low-pressure hydraulic oil replenishment device due to damage or failure or over-pressure replenishment.

[Brief explanation of the drawing]

Fig. 1 is a conceptual diagram of a hydraulic actuator operating device, Fig. 2 is a diagram showing a hydraulic actuator operating device according to the present invention, Fig. 3 is a stroke/angle diagram of a rotating cam, and Figs. 4 and 5 are a diagram of a hydraulic actuator operating device. FIG. 6 is a diagram showing a modification of the dynamic mechanism, and FIG. 6 is a diagram showing a modification of the power storage restoring device. DESCRIPTION OF SYMBOLS 1... Hydraulic actuator, 4... Cylinder type hydraulic pump, 5... Piston rod, 6... Pressure accumulation restoration device, 7... Rotating cam, 8... Forward movement chamber, 10
... Pipe line, 11 ... Relief valve, 13 ... Check valve, 14 ... Hydraulic oil tank, 15 ... Piping, A
-B...actuator forward stroke zone,
B-C……Hydraulic oil relief stroke zone, C
-D...actuator double stroke zone,
D-A...Hydraulic oil replenishment stroke zone.

Claims (1)

[Claims] 1. A hydraulic actuator equipped with a power storage and double-acting device, and a cylinder-type hydraulic pump that is directly connected to the forward movement chamber of the hydraulic actuator so that working medium oil flows through a conduit, and that has a larger volume than the forward movement chamber. , a rotary cam for operating the hydraulic pump, and a power storage restoration device assembled to the piston rod of the hydraulic pump, and the rotary cam has an actuator forward stroke zone, a hydraulic oil relief stroke zone, and an actuator return stroke zone. A hydraulic stroke zone and a hydraulic oil replenishment stroke zone are formed in series in this order, and the pipe line includes a pipe line in which a relief valve is inserted, and a hydraulic oil tank is connected to the hydraulic oil tank through a check valve after the return stroke. A hydraulic actuator actuating device characterized in that a hydraulic actuator is connected to a pipe for suctioning and inflowing the hydraulic actuator.