JP3721061B2 - Bi-directional cylinder device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cylinder device that operates in both the front and rear directions.
[0002]
[Prior art]
Normally, in general cylinder devices, even if they are one-way operation type or two-way operation type, the working fluid on the discharge side when the piston is operated is simply returned to the tank so as not to hinder the operation. . However, if this working fluid on the discharge side is actively used and used again as a fluid for operating the piston, not only will the amount of working fluid used be greatly reduced, but energy will be saved, and the piston will be the same accordingly. The distance traveled in time becomes longer, that is, the operating speed can be increased.
[0003]
If the piston can be advanced half by 50% of the fluid volume and the remaining half can be advanced by the fluid to be discharged, the working fluid pump capacity can be halved, shortening the operation time and doubling the work efficiency. Will do.
Based on such knowledge, the present inventor provided a movable cylinder member having an outer peripheral cylinder part and an inner peripheral cylinder part, and bidirectionally operated the piston of the inner peripheral cylinder part bidirectionally by the discharged fluid of the outer peripheral cylinder part. I found a cylinder device.
[0004]
[Problems to be solved by the invention]
Accordingly, the present invention proposes a novel bidirectional cylinder structure capable of reducing pump capacity and operating time, saving energy and greatly improving work efficiency. With the goal.
[0005]
[Means for Solving the Problems]
That is, the present invention includes a front side fixed table (13) and a rear side fixed table (14) which are arranged opposite to each other via the connecting rod before and after the connecting rod (11) in the axial direction, and the front side fixed table and the rear side. And a movable cylinder member (20) inserted through the connecting rod between the outer fixed cylinder and the movable cylinder member. The movable cylinder member includes an outer peripheral cylinder portion (21) on the outer peripheral side and an inner side of the outer peripheral cylinder portion. A peripheral cylinder part (31), and an outer peripheral piston (22) integrally fixed to the connecting rod is fitted in the outer cylinder part, and an outer peripheral front side for working fluid for moving the movable cylinder member forward and backward It has an inflow portion (25), an outer peripheral rear inflow portion (26), an outer peripheral rear side outflow portion (27), and an outer peripheral front side outflow portion (28). An inner peripheral piston (32) integrally including a front operating member (33) that advances and retreats with respect to the fixed table and a rear operating member (34) that advances and retracts with respect to the rear fixed table is fitted and inserted. An inner peripheral rear inflow portion (35) communicating with the outer peripheral rear side outflow portion for working fluid for moving the piston forward and backward, and an inner peripheral front inflow portion (36) communicating with the outer peripheral front side outflow portion. This relates to a bidirectionally acting cylinder device.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a schematic longitudinal sectional view showing a forward movement state of a bidirectionally operated cylinder device according to an embodiment of the present invention, FIG. 2 is a schematic vertical sectional view showing a backward movement state thereof, and FIG. 3 is a schematic transverse sectional view of the cylinder device. FIG. 4 is a hydraulic circuit diagram thereof.
[0007]
As shown in the drawing, the bidirectionally acting cylinder device 10 of the present invention has a front side (here, a lower side) disposed opposite to each other via the connecting rod 11 in the axial direction of the connecting rod 11 (here, the vertical direction in the figure). Side) fixed table 13 and rear side (upper side here) fixed table 14 and a movable cylinder member 20 inserted between the front side fixed table 13 and the rear side fixed table 14 through the connecting rod.
[0008]
As will be described later, the connecting rod 11 is fixed with an outer peripheral piston 22 fitted and inserted into the outer peripheral cylinder portion 21 of the movable cylinder member 20. Therefore, as shown in a cross-sectional view of FIG. Be placed. The front side fixed table 13 and the rear side fixed table 14 that are arranged to face each other via the connecting rod 11 are fixed side members that are processed by the cylinder device of the present invention. In this embodiment, the metal pressing process is performed. Fixed-side molds 15 and 16 for attaching are attached. In the example shown in the figure, the lower side of the figure is a vertical type with the front part and the upper side is the rear part, but it goes without saying that it may be arranged in a horizontal type.
[0009]
The movable cylinder member 20 has an outer peripheral cylinder portion 21 on the outer peripheral side thereof and an inner peripheral cylinder portion 31 on the inner side of the outer peripheral cylinder portion 21 as can be understood from the cross-sectional view of FIG. Therefore, the outer cylinder portion 21 has a so-called donut shape.
[0010]
As described above, the outer peripheral piston 22 fixed integrally with the connecting rod 11 is fitted into the outer peripheral cylinder portion 21 of the movable cylinder member 20. And the outer periphery front side inflow part 25 for the working fluid which moves this movable cylinder member 20 back and forth, the outer periphery rear side inflow part 26, the outer periphery rear side outflow part 27, and the outer periphery front side outflow part 28 are formed. That is, the outer peripheral piston 22 is on the fixed side, and the movable cylinder member 20 is moved forward and backward by the working fluid flowing into and out of the outer peripheral cylinder portion 21.
[0011]
The inner cylinder portion 31 of the movable cylinder member 20 has an inner circumference integrally including a front operation member 33 that advances and retreats with respect to the front fixed table 13 and a rear operation member 34 that advances and retreats with respect to the rear fixed table 14. The piston 32 is inserted. That is, the inner peripheral cylinder portion 31 and the inner peripheral piston 32 constitute a double-acting cylinder device that operates in both directions. Reference numerals 33A and 34A denote piston rods that connect the inner circumferential piston 32 and the respective operating members 33 and 34, and 37 and 38 are movable side molds corresponding to the fixed side molds 15 and 16, respectively.
[0012]
The inner peripheral cylinder portion 31 includes an inner peripheral rear inflow portion 35 and an inner peripheral front inflow portion 36 for working fluid that moves the inner peripheral piston 32 forward and backward. In particular, the apparatus according to the present invention is configured such that the inner periphery rear side inflow portion 35 and the outer periphery rear side outflow portion 27 communicate with each other, and the inner periphery front side inflow portion 36 communicates with the outer periphery front side outflow portion 28. The By configuring in this way, the inner peripheral piston 32 can move forward simultaneously when the movable cylinder member 20 moves forward, and the inner peripheral piston 32 can move backward simultaneously when the movable cylinder member 20 moves backward.
In addition, regarding the inner peripheral cylinder portion 31, in this embodiment, the outflow portion for the working fluid is not provided independently. However, as can be seen from the circuit diagram of FIG. This is because the inner peripheral front side inflow portion 36 also serves as the outflow portion by providing the switching valves 55 and 56, respectively. Of course, this does not prevent the provision of a dedicated outflow part.
[0013]
Next, the operation of the bidirectional operation cylinder device 10 will be described.
FIG. 4 is a hydraulic circuit diagram for operating the cylinder device 10 of this embodiment (note that the working fluid is not limited to pressure oil). Reference numerals 41, 42, and 43 are forward side circuits, and reference numerals 44, 45, Reference numeral 46 denotes a backward side circuit. 4, 50 is a pump, 51 is a switching valve, 51A is its forward switch, 51B is its backward switch, 53, 54 and 57 are check valves, 55 is a (forward) switching valve, and 56 is The (reverse side) switching valves 61, 62, and 63 are unload portions.
[0014]
First, the forward state of FIG. 1 will be described. In this case, the forward side circuits 41, 42, and 43 in the circuit diagram of FIG. That is, the forward side switch 51A of the switching valve 51 is turned on, the switching valve (forward side) 55 is turned on, and the switching valve (reverse side) 56 is turned off. Then, the pressure oil from the pump 50 flows into the front portion of the outer cylinder portion 21 from the outer periphery front inlet portion 25 of the movable cylinder member 20 via the circuit 41. Since the outer piston 22 fitted and inserted into the outer cylinder portion 21 is integrally fixed to the connecting rod 11, when the pressure oil flows into the front portion of the outer cylinder portion 21, the movable cylinder member 20 itself is illustrated. It moves forward as indicated by the arrow symbol F1.
[0015]
As the movable cylinder member 20 moves forward F1, the oil located at the rear portion of the outer peripheral piston 22 passes through the circuit 42 in which the switching valve 55 is turned on from the outer peripheral rear outflow portion 27 to the inner peripheral cylinder of the movable cylinder member 20. It flows into the inner periphery rear side inflow portion 35 of the portion 31. As a result, the inner circumferential piston 32 is advanced as indicated by the arrow F2 in FIG.
[0016]
As the inner peripheral piston 32 moves forward, the oil located at the front portion of the inner peripheral piston 32 of the inner peripheral cylinder portion 31 is discharged to the outside from the inner peripheral front inflow portion (in this case, the outflow portion) 36 and switched. Since the valve 56 is off, it is returned from the circuit 43 to the tank via the unload circuit 62.
[0017]
2 will be described. In this case, the reverse side switch 51B of the switching valve 51 in the circuit diagram of FIG. 4 is on, the switching valve (forward side) 55 is off, and the switching valve (reverse side) 56 is turned on. Is turned on, and the retreat side circuits 44, 45, 46 are activated. That is, the pressure oil from the pump 50 flows into the rear portion of the outer cylinder portion 21 from the outer periphery rear inflow portion 26 of the movable cylinder member 20 through the circuit 44 when the reverse side switch 51B of the switching valve 51 is turned on. Since the outer piston 22 fitted in the outer cylinder portion 21 is integrally fixed to the connecting rod 11 as described above, when the pressure oil flows into the rear portion of the outer cylinder portion 21, the movable cylinder The member 20 itself moves backward as indicated by an arrow R1 in FIG.
[0018]
As the movable cylinder member 20 moves rearward R1, the oil located at the front portion of the outer peripheral piston 22 passes through the circuit 45 in which the switching valve 56 is turned on from the outer peripheral front outflow portion 28 to the inner peripheral cylinder of the movable cylinder member 20. It flows into the inner circumferential front inflow portion 36 of the portion 31. As a result, the inner circumferential piston 32 is retracted as indicated by the arrow R2 in FIG.
[0019]
As the inner peripheral piston 32 moves backward, the oil located at the rear of the inner peripheral piston 32 of the inner peripheral cylinder portion 31 is discharged to the outside from the inner peripheral rear inflow portion (in this case, the outflow portion) 35 and switched. Since the valve 55 is turned off, it is returned to the tank from the circuit 46 via the unload circuit 63.
[0020]
【The invention's effect】
As can be seen from the above description, in the device according to the present invention, when the movable cylinder member moves forward, the inner circumferential piston moves forward independently, and when the movable cylinder member moves backward, the inner circumferential piston moves together. Since the operation member provided on the inner peripheral piston moves backward independently, the movement distance (stroke) F2 of the inner peripheral piston is moved to the movement distance (stroke) F1, R1 of the movable cylinder member within approximately the same time. , R2 plus the distance (F1 + F2, R1 + R2). Therefore, the time can be greatly reduced as compared with the case where the same distance is moved by a single piston. In addition, the capacity of the working fluid pump can be greatly reduced.
[0021]
In addition, in the device according to the present invention, the inner peripheral piston is operated in both the front and rear directions, so that the work efficiency can be greatly improved, and the present invention makes it possible to save energy and dramatically improve the work efficiency. Improvements can be made.
[Brief description of the drawings]
FIG. 1 is a schematic longitudinal sectional view showing a forward movement state of a bidirectionally acting cylinder device according to an embodiment of the present invention.
FIG. 2 is a schematic longitudinal sectional view showing the retracted state.
FIG. 3 is a schematic cross-sectional view of the cylinder device.
FIG. 4 is a hydraulic circuit diagram for operating the cylinder device of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Bidirectional cylinder apparatus 11 Connecting rod 13 Front side fixed table 14 Rear side fixed table 20 Movable cylinder member 21 Outer cylinder member 22 Outer piston 25 Outer front inlet part 26 Outer rear inlet part 27 Outer rear outlet part 28 Outer front outlet Part 31 Inner peripheral cylinder member 32 Inner peripheral piston 33 Front operating member 34 Rear operating member 35 Inner peripheral rear inflow part 36 Inner peripheral front inflow part

Claims (1)

The front fixed table (13) and the rear fixed table (14) arranged opposite to each other via the connecting rod on the front and rear in the axial direction of the connecting rod (11), and between the front fixed table and the rear fixed table. And a movable cylinder member (20) inserted through the connecting rod.
The movable cylinder member has an outer peripheral cylinder part (21) on the outer peripheral side thereof and an inner peripheral cylinder part (31) on the inner side of the outer peripheral cylinder part,
An outer peripheral piston (22) integrally fixed to the connecting rod is fitted into the outer peripheral cylinder portion, and an outer peripheral front inflow portion (25) and an outer peripheral rear inflow portion for working fluid for moving the movable cylinder member forward and backward. (26) and the outer peripheral rear outflow portion (27) and the outer peripheral front outflow portion (28),
The inner peripheral piston (32) integrally includes a front operating member (33) that advances and retracts relative to the front fixed table and a rear operating member (34) that advances and retracts relative to the rear fixed table in the inner peripheral cylinder portion. And an inner peripheral rear inflow portion (35) communicating with the outer peripheral rear outflow portion for working fluid for advancing and retreating the inner peripheral piston, and an inner peripheral front inflow portion communicating with the outer peripheral front outflow portion (36) and a bidirectionally acting cylinder device.

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