JPH09169480A - Reciprocating body driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To elevate each driving fluid pressure cylinder at an equal speed in a reciprocating body driving device, in which plural driving fluid pressure cylinders such as hydraulic cylinders for driving a reciprocating body for reciprocation are provided between the reciprocating body and a base in parallel with each other and a raising (for advance) hydraulic pipeline and a lowering (for retreatment) common to these driving hydraulic cylinders are connected to each other. SOLUTION: Hydraulic cylinders 10A, 10B for synchronous control, which are arranged in parallel with each other per each driving hydraulic cylinder 3A, 3B and which is interposed between a reciprocating body 1 and a base 2, are provided, and in these hydraulic cylinders 10A, 10B for synchronous control, both the oil pressure chambers 13a, 13b are formed at the same pressure receiving area, and each oil pressure chamber 13a, 13b of all the hydraulic cylinders 10A, 10B for synchronous control are connected in series in the endless condition so that an upper side (advance side) oil pressure chamber 13a and a lower side (retreatment side) oil pressure chamber 13b of different cylinders are connected to each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a pneumatically or hydraulically operated cylinder for various reciprocating movable bodies used as a table lifter for lifting and lowering a transported object, a work table whose support level can be changed, and the like. The present invention relates to a reciprocating drive device.

[0002]

2. Description of the Related Art A case in which a reciprocating movable body is an elevating table will be described as an example. When a reciprocating movable body has a large load weight or when the reciprocating movable body itself is large, there are a plurality of reciprocating movable body reciprocating driving devices. It is known that two hydraulic cylinders are installed side by side between the reciprocating movable body and the base, and common hydraulic pipes for ascending (forward) and descending (reverse) hydraulic pipes are connected to all these hydraulic cylinders. Has been.

In the reciprocating movable body hydraulic drive apparatus having the above-described structure, it is difficult to move all the hydraulic cylinders up and down at a constant speed due to variations in the load applied to the respective hydraulic cylinders. The movable body (elevating table) may tilt. Further, when a plurality of elevating guides are arranged side by side, the elevating guides are twisted and it is difficult to smoothly perform the elevating movement.

In order to solve such a problem, for example, a mechanical forced tuning mechanism using a rack and pinion gear is arranged between the reciprocating movable body and the base, but the structure is complicated. However, there is a drawback that it will inevitably increase the cost significantly and lead to an increase in the size of the entire device.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a hydraulic drive system for a reciprocating movable body capable of solving the above-mentioned conventional problems, which means will be described later. Reciprocating movable body 1 is shown with reference numerals of the form.
A plurality of drive fluid pressure cylinders for reciprocating the reciprocating movable body 1 between the base 2 and the base 2, for example, hydraulic cylinders 3.
A and 3B are arranged side by side, and a drive device of a reciprocating movable body in which a forward (up) hydraulic pipe 8 and a backward (down) hydraulic pipe 9 common to all of these drive hydraulic cylinders 3A and 3B are connected. Yes, the hydraulic cylinders 3A, 3B for each drive
Each of the cylinders is provided with tuning control hydraulic cylinders 10A and 10B that are interposed between the reciprocating movable body 1 and the base 2 in parallel.
These tuning control hydraulic cylinders 10A and 10B are
The pressure receiving areas of the two hydraulic chambers 13a and 13b are the same, and the forward side (upper) hydraulic chambers 1 of different cylinders are different from each other.
3a and the retreating side (lower side) hydraulic chamber 13b are connected so that the hydraulic chambers 13a, 13b of all the tuning control hydraulic cylinders 10A, 10B are connected in an endless series.

Further, according to the present invention, when the hydraulic cylinder is used as the driving fluid pressure cylinder as described above, a plurality of tuning control hydraulic cylinders 10A to 10D are used.
Among the above, the backward side (lower side) hydraulic chamber 13b of one tuning control hydraulic cylinder 10A is the driving hydraulic cylinders 3A to 3A.
Connected to the forward (up) hydraulic pipe 8 of D, the forward-side (upper) hydraulic chamber 13a of the other synchronization control hydraulic cylinder 10D is for backward (down) of the drive hydraulic cylinders 3A to 3D. The hydraulic chambers 13a and 13b of the synchronous control hydraulic cylinders 10A to 10D, which are connected to the hydraulic pipe 9 and are not connected to the hydraulic pipes 8 and 9, respectively, have forward and backward hydraulic chambers 13a and 13b of different cylinders. There is also provided a drive device which is connected in series so as to be connected to the hydraulic chamber 13b.

In carrying out each of the above-mentioned devices of the present invention, each hydraulic chamber 1 of each synchronous control hydraulic cylinder 10A-10D.
Switching means (pilot check valve 22) capable of switching the pipes 17a to 19a connecting 3a and 13b between a closed state and an open state and a pressurized state connected to the hydraulic pressure source 20.
a to 22c and the electromagnetic switching valve 23) can be connected.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment in which the present invention is embodied as an ascending / descending drive device for an ascending / descending table will now be described with reference to the accompanying drawings. In FIG. 1 showing a first embodiment, 1 is a base 2 It is a table-like reciprocating movable body that can be moved up and down with respect to. 3A and 3B are drive hydraulic cylinders that drive the reciprocating movable body 1 up and down. In the illustrated example, the cylinder body 4 is vertically mounted on the base 2, and the reciprocating movable body 1 is driven by a piston rod 5 protruding upward. Is supported. Then, the drive hydraulic cylinders 3A, 3B
The lower hydraulic chamber 6 is connected to a common hydraulic pipe 8 for raising,
The upper hydraulic chamber 7 of each drive hydraulic cylinder 3A, 3B is connected to a common lowering hydraulic pipe 9.

Numerals 10A and 10B are tuning control hydraulic cylinders which are interposed between the reciprocating movable body 1 and the base 2 in parallel with each other for the driving hydraulic cylinders 3A and 3B, respectively. On the other hand, the piston rods 12a and 12b having the same diameter are continuously provided in both directions, so that the upper and lower hydraulic chambers 13a and 13b have the same pressure receiving area. In the illustrated example, each of the tuning control hydraulic cylinders 10A and 10B is attached to the base 2 so that the cylinder body 14 is adjacent to the driving hydraulic cylinders 3A and 3B in parallel, and the upper piston rod 12a is free from play. Reciprocating movable body 1
Is joined to. The upper hydraulic chamber 13a of the tuning control hydraulic cylinder 10A and the lower hydraulic chamber 13b of the tuning control hydraulic cylinder 10B are connected by a pipe 15, and the lower hydraulic chamber 13 of the tuning control hydraulic cylinder 10A is connected.
b and the upper hydraulic chamber 13 of the tuning control hydraulic cylinder 10B
The pipe 16 is connected to a.

In the above structure, hydraulic pressure is supplied to the lower hydraulic chamber 6 of both drive hydraulic cylinders 3A and 3B from the hydraulic pipe 8 for ascent, and the hydraulic cylinder 3 for both drive is also provided.
By opening the upper hydraulic chambers 7 of A and 3B, the piston rods 5 of the drive hydraulic cylinders 3A and 3B can be moved upward to raise the reciprocating movable body 1, and vice versa. While supplying hydraulic pressure from the pipe 9 to the upper hydraulic chambers 7 of the drive hydraulic cylinders 3A, 3B,
By opening the lower hydraulic chamber 6 for both drive hydraulic cylinders 3A, 3B, both drive hydraulic cylinders 3A, 3B
It is possible to drive the piston rod 5 of 3B downward to lower the reciprocating movable body 1. At this time, the piston rods 12a and 12b and the piston 11 of the two tuning control hydraulic cylinders 10A and 10B move the reciprocating movable body 1 at the same time. Will move up and down together.

Thus, the hydraulic cylinder 1 for controlling both tunes.
Upper and lower hydraulic chambers 13a and 13b of 0A and 10B and piping 1
5 and 16 are completely filled with oil (this oil is pressurized to a predetermined pressure as necessary (preload is applied))
And each synchronous control hydraulic cylinder 10
The piston rods 12a of A and 10B are moved up and down by moving the amount of filling oil between the upper hydraulic chamber 13a of the tuning control hydraulic cylinder 10A and the lower hydraulic chamber 13b of the tuning control hydraulic cylinder 10B, and the tuning control hydraulic pressure. The amount of movement of the filling oil between the lower hydraulic chamber 13b of the cylinder 10A and the upper hydraulic chamber 13a of the tuning control hydraulic cylinder 10B is regulated to a constant velocity state.

Therefore, the drive hydraulic cylinders 3A, 3B
The piston rod 5 of one of the driving hydraulic cylinders 3A or 3B may become different from the piston rod 5 of the other driving hydraulic cylinder 3B or 3A due to variations in the load acting on the
When trying to move up and down at a higher speed than the driving hydraulic cylinder 3 with respect to the piston rod 5 of the driving hydraulic cylinder 3A or 3B on the side that tries to move up and down at a higher speed.
The tuning control hydraulic cylinders 10A or 10B arranged adjacent to A or 3B apply braking through the reciprocating movable body 1, and conversely, the drive hydraulic cylinders 3B on the side about to move up and down with delay. For the piston rod 5 of 3A, the tuning control hydraulic cylinder 1 is provided in parallel with the driving hydraulic cylinder 3B or 3A.
OB or 10A will be urged through the reciprocating movable body 1 in a direction that assists its lifting. As a result, the piston rods 5 of the drive hydraulic cylinders 3A and 3B move up and down at a substantially constant speed, and the reciprocating movable body 1 moves up and down smoothly without tilting.

Next, a second embodiment of the present invention will be described with reference to FIG. 2. In this second embodiment, four driving hydraulic cylinders 3A to 3 are used to drive the reciprocating movable body 1 up and down.
D is used, the lower hydraulic chamber 6 of each driving hydraulic cylinder 3A to 3D is connected to a common lifting hydraulic pipe 8, and the upper hydraulic chamber 7 of each driving hydraulic cylinder 3A to 3D is a common lowering hydraulic pressure. It is connected to the pipe 9. The tuning control hydraulic cylinders 10A to 10D are arranged in parallel for each of the drive hydraulic cylinders 3A to 3D.

These tuning control hydraulic cylinders 10A-
The configuration of 10D is the same as that described above, but one lower hydraulic chamber 13b for the tuning control hydraulic cylinder 10A is used.
Is connected to the ascending hydraulic pipe 8 of the drive hydraulic cylinders 3A to 3D, and the upper hydraulic chamber 13a of the other synchronizing hydraulic cylinder 10D is connected to the descending hydraulic pipe 9 of the drive hydraulic cylinders 3A to 3D. The upper and lower hydraulic chambers 13a and 13b of the tuning control hydraulic cylinders 10A to 10D, which are connected to each other and are not connected to the ascending hydraulic pipe 8 and the descending hydraulic pipe 9, respectively, have an upper hydraulic chamber 13a and a lower hydraulic chamber 13a of different cylinders. Pipes 17a to 19a are connected in series so as to be connected to the side hydraulic chamber 13b.

However, in this second embodiment, the upper and lower hydraulic chambers 1 of the respective tuning control hydraulic cylinders 10A to 10D are provided.
To the connection pipes 17a to 19a connecting the 3a and 13b, a switching unit that can switch between a closed state, an open state, and a pressurized state connected to the hydraulic power source 20 is connected. This switching means includes three pilot check valves 22a to 22.
c and one electromagnetic switching valve 23. The electromagnetic switching valve 23 includes a neutral closing portion 23a that achieves the closed state shown in the figure, and pilot check valves 22a-2.
2c to supply pilot pressure from the pressure source 20 to open the pilot check valves 22a to 22c to obtain an open state, and an oil pressure from the pressure source 20 to the pilot check valves 22a to 22c and the connecting pipe 1
Connection pipes 17a to 19a via 7b to 19b
It is provided with a pressurizing path portion 23c for obtaining a pressurizing state to be supplied to

Reference numeral 24 is an electromagnetic switching valve interposed between the pressure source 20 and the ascending hydraulic pipe 8 and the descending hydraulic pipe 9, and 25 is for holding the reciprocating movable body 1 in the ascending position. It is a pilot check valve. The electromagnetic switching valve 24 is the same as the preceding electromagnetic switching valve 23, and includes a neutral closing portion 24a for obtaining the closed state shown in the figure and a hydraulic pipe for raising hydraulic pressure from the pressure source 20 via a pilot check valve 25. Ascending path portion 24b for supplying to 8
And a descending path portion 24c for supplying the hydraulic pressure from the pressure source 20 to the descending hydraulic pipe 9 and supplying the pilot pressure to the pilot check valve 25 to open the check valve 25.

In the above configuration, the electromagnetic switching valve 24
Is switched from the neutral closed state shown in the drawing to the operating position, the hydraulic pressure from the pressure source 20 is supplied to the hydraulic pressure rising pipe 8 via the pilot check valve 25, and the hydraulic pressure hydraulic pipe 9 is opened. By doing so, the piston rod 5 of each of the drive hydraulic cylinders 3A to 3D can be driven to rise, and the reciprocating movable body 1 can be raised. Further, the lowering path portion 24c of the electromagnetic switching valve 24 is switched to the operating position, and the lowering hydraulic pipe 9 is connected to the pressure source 20.
By supplying the hydraulic pressure from and also supplying and releasing the pilot pressure to the pilot check valve 25,
Piston rod 5 of each drive hydraulic cylinder 3A-3D
Can be driven downward to lower the reciprocating movable body 1.

At this time, the upper and lower hydraulic chambers 13a and 13b of all the synchronous control hydraulic cylinders 10A to 10D and all the pipes 17a to 19b connected to these hydraulic chambers 13a and 13b are completely filled with oil. In this state, for example, when the reciprocating movable body 1 is driven to move up, it is supplied from the lifting hydraulic pipe 8 to the lower hydraulic chamber 13b of one tuning control hydraulic cylinder 10A. The hydraulic pressure passes through the piston 11 of the tuning control hydraulic cylinder 10A, the upper hydraulic chamber 13a, and the pipe 17a to the lower hydraulic chamber 13 of the next tuning control hydraulic cylinder 10B.
b, and then the hydraulic pressure is passed through the piston 11 of the tuning control hydraulic cylinder 10B, the upper hydraulic chamber 13a, and the pipe 18a to the next tuning control hydraulic cylinder 10C.
To the lower hydraulic chamber 13b, and further to the piston 11 and the upper hydraulic chamber 13 of the tuning control hydraulic cylinder 10C.
By being transmitted to the lower hydraulic chamber 13b of the last tuning control hydraulic cylinder 10D via a and the pipe 19a, the piston rods 12a of all the tuning control hydraulic cylinders 10A to 10D are attached in the ascending direction at the same pressure. Energized. In other words, the reciprocating movable body 1 includes the drive hydraulic cylinders 3A to 3D and the tuning control hydraulic cylinders 10A to 10D.
It will be driven upward by D and.

A hydraulic cylinder 10 for driving the reciprocating movable body 1
Even when it is driven to descend by A to 10D, the hydraulic pressure supplied from the descending hydraulic pipe 9 to the upper hydraulic chamber 13a of one tuning control hydraulic cylinder 10D is equal to that of the pipes 19a, 1d.
8a, 17a is transmitted to the upper hydraulic chambers 13a of all the other tuning control hydraulic cylinders 10A to 10C, and the piston rods 12a of all the tuning control hydraulic cylinders 10A to 10D are urged downward with the same pressure. To be done. In other words, the reciprocating movable body 1 is the driving hydraulic cylinder 3A.
.About.3D and the tuning control hydraulic cylinders 10A to 10D are driven downward.

However, each synchronous control hydraulic cylinder 1
0A to 10D are connected in series, and each piston rod 12a can move only at a constant speed. Therefore, similarly to the first embodiment, due to variations in load acting on the driving hydraulic cylinders 3A to 3D. , When the piston rod 5 of one of the driving hydraulic cylinders tries to move up and down at a higher speed than the piston rod 5 of the other driving hydraulic cylinder,
With respect to the piston rod 5 of the driving hydraulic cylinder that is going to move up and down at a high speed, the tuning control hydraulic cylinders 10A to 10A that are juxtaposed in parallel with the driving hydraulic cylinder.
One or more of 0D will apply braking through the reciprocating movable body 1, and conversely, the piston rod 5 of the drive hydraulic cylinder that is about to move up and down with a delay will be adjacent to the drive hydraulic cylinder. One or a plurality of the tuning control hydraulic cylinders 10A to 10D are urged via the reciprocating movable body 1 in a direction that assists the lifting and lowering thereof. As a result, each driving hydraulic cylinder 3A to 3D
The piston rod 5 moves up and down at a substantially constant speed, and the reciprocating movable body 1 moves up and down smoothly without tilting.

In the second embodiment, when the reciprocating movable body 1 is lowered to the lower limit position, for example, when the sensor detects the reciprocating movable body 1 reaching the lower limit position, the electromagnetic switching valve 23 is neutrally closed. From the state, the open path portion 23b is switched to the operating position, and each pilot check valve 22a
22c are opened to open the upper hydraulic chamber 13a of the tuning control hydraulic cylinder 10A, the upper and lower hydraulic chambers 13a and 13b of the tuning control hydraulic cylinders 10B and 10C, and the lower hydraulic chamber 13b of the tuning control hydraulic cylinder 10D.
Can be opened via the pipes 17a to 19b, respectively. At this time, the tuning control hydraulic cylinder 10A
Since the lower hydraulic chamber 13b is being driven downward, it is connected to the ascending hydraulic pipe 8 that is opened by the pilot check valve 25 and the electromagnetic switching valve 24, and is also open for tuning control. Hydraulic cylinder 10D
Since the upper hydraulic chamber 13a is in the descending drive, it is connected to the hydraulic source 20 via the descending hydraulic pipe 9 and is urged in the descending direction.

Therefore, by performing the opening operation,
Even if there is a level of the piston rod 12a of the tuning control hydraulic cylinders 10A to 10D, and there is a tuning control hydraulic cylinder in which the piston rod 12a is not fully lowered to the lower limit, the lowering hydraulic pressure is present. By the hydraulic pressure supplied from the pipe 9 to the upper hydraulic chamber 7 of each of the drive hydraulic cylinders 3A to 3D and the upper hydraulic chamber 13a of the synchronization control hydraulic cylinder 10D, the piston rods 12a of all the synchronization control hydraulic cylinders 10A to 10D.
It is possible to reliably lower the reciprocating movable body 1 until the state reaches the lower limit position.

In addition, in the second embodiment, when the reciprocating movable body 1 is driven to rise, the electromagnetic switching valve 24 is switched to the lowering drive side immediately before that (the lowering path portion 24c is switched to the operating position), and each Hydraulic pressure is supplied to the upper hydraulic chambers 7 of the driving hydraulic cylinders 3A to 3D and the upper hydraulic chamber 13a of the tuning control hydraulic cylinder 10D to urge the reciprocating movable body 1 in the descending direction, and the electromagnetic switching valve 23 is operated. The pressurizing passage portion 23c is switched to the operating position, and the hydraulic pressure from the pressure source 20 is passed through the pilot check valves 22a to 22c and the connecting pipes 17b to 19b to the pipes 17a to 19a.
To these pipes 17a to 19b and these pipes 1
Hydraulic cylinder 10 for synchronization control connected to 7a to 19a
Upper hydraulic chamber 13a of A, hydraulic cylinder 10 for synchronization control
It is possible to pressurize the upper and lower hydraulic chambers 13a and 13b of B and 10C and the lower hydraulic chamber 13b of the synchronization control hydraulic cylinder 10D to compress air bubbles in the oil and apply a predetermined preload. After this preload operation, the electromagnetic switching valve 2
3 may be returned to the neutral closed state, the electromagnetic switching valve 24 may be switched to the ascending drive side, and the ascending drive of the reciprocating movable body 1 may be performed.

In the above preload operation, after switching the electromagnetic switching valve 24 to the downward drive side, the opening operation described above, that is, the opening path portion 23 of the electromagnetic switching valve 23 is performed.
It is also possible to perform an opening operation for switching b to the operating position, and subsequently to switch the pressurizing path portion 23c of the electromagnetic switching valve 23 to the operating position as described above to perform preloading. Further, when the reciprocating movable body 1 is driven downward as described above, the reciprocating movable body 1 has been lowered, and the electromagnetic switching valve 24 is not yet returned to the neutral closed state. It is also possible to perform the above preload operation.

In both the first embodiment and the second embodiment, the number of drive hydraulic cylinders (thus the number of tuning control hydraulic cylinders) is an example, and the number is not limited to the number shown in these embodiments. Further, switching means (22a to 22c, 2) for opening and pressurizing the hydraulic pipe system of the tuning control hydraulic cylinder in the second embodiment.
3) can also be incorporated in the first embodiment. Furthermore, the switching means for opening and pressurizing the hydraulic cylinder system of the tuning control hydraulic cylinder in the second embodiment,
The structure is not limited to the combination of the pilot check valves 22a to 22c and the electromagnetic switching valve 23. For example, the pilot check valves 22a to 22c may be composed of only the electromagnetic switching valve.

When the hydraulic pipe of the drive hydraulic cylinder and the hydraulic pipe of the tuning control hydraulic cylinder are separated from each other as in the first embodiment, the drive hydraulic cylinder for reciprocating the reciprocating movable body is used. Pneumatic cylinders can also be used. Of course, the types of the drive fluid pressure cylinder and the tuning control hydraulic cylinder are not limited, and, for example, a rodless cylinder or the like can be used. Furthermore, in each of the above-described embodiments, a table-like object that moves up and down is shown as the reciprocating movable body, but it can also be used as a drive device for the reciprocating movable body that reciprocates in the horizontal direction or the like.

[0027]

As described above, according to the driving device for a reciprocating movable body of the present invention, it is possible to prevent variations in loads acting on the driving fluid pressure cylinders arranged in parallel for reciprocating the reciprocating movable body. Even when the operating speed of each drive fluid pressure cylinder varies, the tuning control hydraulic cylinders installed in parallel with each drive fluid pressure cylinder brake the drive fluid pressure cylinders that are about to move at high speed. It is possible to reciprocate each of the drive fluid pressure cylinders at a substantially constant speed by urging the drive fluid pressure cylinders, which tend to be delayed, in a direction of increasing the moving speed.

Therefore, the tuning control hydraulic cylinders are provided in parallel with each of the drive fluid pressure cylinders, and the necessary hydraulic pipes are provided. The construction is relatively simple and can be carried out at a low cost. Therefore, the reciprocating movable body can be smoothly reciprocated while maintaining the desired posture without inclining the reciprocating movable body.

When a hydraulic cylinder is used as the driving fluid pressure cylinder for reciprocally driving the reciprocating movable body, according to the configuration of claim 2, the tuning control hydraulic cylinder may also be used as the driving hydraulic cylinder. It can be made to function and the original hydraulic cylinder for driving can be downsized.

Further, according to the third aspect of the invention, when the reciprocating movable body is returned to the backward direction, the retreating side hydraulic chamber of the tuning control hydraulic cylinder is opened, and the reciprocating movable body is moved by the drive fluid pressure cylinder. Even if it is possible to drive to the reverse limit position completely, even if the function of the synchronization control hydraulic cylinder is not perfect and there is a slight variation in the backward movement amount of each drive fluid pressure cylinder, the error concerned It is possible to avoid inconveniences such as being accumulated and hindering practical use. Further, prior to the forward drive, an appropriate preload is applied to the hydraulic piping system of the synchronization control hydraulic cylinder to compress the bubbles in the oil, so that the desired synchronization function can always be exerted.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration of a first embodiment and a hydraulic piping system.

FIG. 2 is a diagram illustrating a configuration of a second embodiment and a hydraulic piping system.

[Explanation of Codes] 1 Reciprocating movable body 2 Base 3A to 3D Driving hydraulic cylinder 4,14 Cylinder body 5, 12a, 12b Piston rod 6, 13b Lower side (retraction side) hydraulic chamber 7, 13a Upper side (forward side) Hydraulic chamber 8 Ascending (forward) hydraulic pipe 9 Descent (reverse) hydraulic pipe 10A to 10D Synchronous control hydraulic cylinder 11 Piston 15, 16, 17a to 19b Connection pipe 20 Hydraulic power source 22a to 22c, 25 Pilot check valve 23, 24 Electromagnetic switching valve

Claims (3)

[Claims] 1. A plurality of driving fluid pressure cylinders for reciprocatingly driving the reciprocating movable body are arranged in parallel between the reciprocating movable body and a base, and a forward fluid pressure common to all the driving fluid pressure cylinders. A drive device for a reciprocating movable body, in which a pipe and a fluid pressure pipe for retreating are connected, wherein a tuning control hydraulic pressure is provided between the reciprocating movable body and a base in parallel for each of the drive fluid pressure cylinders. Each of these tuning control hydraulic cylinders has the same pressure-receiving area in both hydraulic chambers, and all tuning control hydraulic cylinders are connected so that the forward and backward hydraulic chambers of different cylinders are connected to each other. A reciprocating movable hydraulic drive device in which hydraulic chambers of a hydraulic cylinder are connected in an endless series. 2. A plurality of drive hydraulic cylinders for reciprocating the reciprocating movable body are provided in parallel between the reciprocating movable body and the base,
A drive device for a reciprocating movable body in which a forward hydraulic line and a backward hydraulic line common to all of these driving hydraulic cylinders are connected, and the reciprocating movable body and the base are arranged in parallel for each of the driving hydraulic cylinders. There is a tuning control hydraulic cylinder interposed between the two tuning control hydraulic cylinders. The tuning control hydraulic cylinders have the same pressure receiving area in both hydraulic chambers. The forward hydraulic line of the drive hydraulic cylinder is connected, the forward hydraulic chamber of the other synchronous control hydraulic cylinder is connected to the reverse hydraulic line of the drive hydraulic cylinder, and the forward hydraulic line and The hydraulic chambers of each synchronous control hydraulic cylinder that are not connected to the reverse hydraulic pipe are connected in series so that the forward hydraulic chamber and the reverse hydraulic chamber of different cylinders are connected. Drive device for reciprocating movable bodies that are connected in a circular shape. 3. A switching means capable of switching between a closed state, an open state and a pressurized state connected to a hydraulic pressure source is connected to a pipe connecting each hydraulic chamber of each synchronous control hydraulic cylinder. Alternatively, the drive device for the reciprocating movable body according to the item 2.