JPH0130642Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Object of the Invention/Field of Industrial Application) The present invention relates to a fluid pressure cylinder device capable of linear operation and rotational operation, and can be used in a traverser, a handling device, etc.

(Prior art) Conventionally, fluid pressure cylinders have often been used to move objects, but
As labor savings progress, complex operations are required, and various structures have been adopted to perform complex operations that include linear operations and rotational operations of fluid pressure cylinders. One example is a fluid pressure cylinder in which a gentle spiral groove is provided over the entire length of the cylinder tube, and the reciprocating piston operates linearly and rotates along the spiral groove. Another example is a structure in which a gear or key is provided so that the piston or piston rod can be engaged with the piston or piston rod only in the rotational direction and can be driven to rotate from the outside. However, in the former case, the operating sequence of the rotation movement is fixed and cannot be changed, and in the latter case, sealing is difficult, and neither of these methods can be easily applied to a telescopic fluid pressure cylinder.

In order to resolve these difficulties, the
As disclosed in Japanese Patent No. 158505, the fixed state between the piston and the piston rod is released, and the two move together in the axial direction, but the piston rod is connected to the piston in the circumferential direction so that it can freely rotate. , the piston rod extends through both the piston and cylinder covers, one extension side being connected to the drive means and the other extension serving as the required working part, in the axial direction of the piston and thus of the piston rod. A fluid pressure cylinder has been proposed in which the working part moves linearly back and forth by movement, and the working part is rotated in the circumferential direction by rotationally driving a piston rod.

According to this prior art, since the piston itself does not rotate, a sufficient seal is ensured between the piston and the cylinder tube, but there is a problem in the sealing performance between both covers of the cylinder and the piston rod. In general, seals (packskins) can provide sufficient sealing performance for linearly operated members, but
In the direction of rotation, there is a risk of applying stress that can cause seal failure, and in this case, it is possible to use a sealing pad that corresponds to the sealing performance for a rotating member that operates only in the direction of rotation. In the case of a member in which the piston rod operates not only in the linear direction but also in the rotational direction, as in this prior art, there is a risk that the sealing performance between the piston rod and the cylinder cover may be destroyed in a short period of time, resulting in long-term damage. It has the disadvantage that it cannot be used stably, and furthermore, because the piston rod penetrates through both covers of the cylinder, it cannot be applied to a telescope type fluid pressure cylinder like the conventional example.

(Purpose of the invention) This invention was created in view of the above circumstances.
It is an object of the present invention to provide a fluid pressure cylinder device of this kind that is capable of linear operation and rotational operation in any sequence and can also be applied to a telescopic fluid pressure cylinder.

(Technical Means of the Invention) In the present invention, a rod device is provided in the fluid pressure cylinder, and this rod device consists of a guide member and a rod member that slides inside the guide member. The guide member is arranged so that the axes of the cylinder and each other are parallel to each other, and the guide member is integrally provided with a connecting member having a ring portion that rotatably fits on the outer periphery of the rod cover of the fluid pressure cylinder. The guide member is attached to the rod cover via the connecting member so as to be immovable in the axial direction but rotatable in the circumferential direction around the axis of the hydraulic cylinder. The rod member is provided with driving means for rotationally driving the rod member, and the tip of the rod member is connected to the ram tip of the fluid pressure cylinder by a connecting plate so as to move integrally with each other in the axial direction, and the connecting plate The ram of the fluid pressure cylinder is rotated about its axis by the rotation of the guide member, and the connecting portion between the connecting plate and the ram is configured such that the connecting plate is rotatable relative to the ram. It is characterized by this.

(Example) The present invention will be described below by way of an example with reference to the drawings.

1 and 2, reference numeral 1 denotes a two-stage telescopic double-acting hydraulic cylinder, which includes a cylinder tube 2, a first ram 3,
It consists of a second ram 4, a rod cover 5, a head cover 6, etc. On the other hand, the two-stage telescopic rod device 7 includes a guide member 8, a first rod 9, a second rod 10, etc., and is arranged parallel to the cylinder 1. The second rod 10 slides within the cylindrical first rod 9, and the first rod 9 slides within the guide member 8. The guide member 8 includes a ring portion 1
The ring portion 1 is formed integrally with the connecting member 11 having a ring portion 1, and has a cross section approximately in the shape of a figure 8.
2 is fitted into a ring-shaped groove 5a provided on the outer periphery of the rod cover 5, so that it cannot move in the axial direction and can only rotate in the circumferential direction. A driven gear 13 is provided on the outer periphery of the ring portion 12.
a rotary drive source 15 having a drive gear 14 meshing with the rotary drive source 15;
is attached to the rod cover 5. The tip of the second rod 10 and the tip of the second ram 4 are connected to the connecting plate 1.
6 is externally fitted over the respective threaded portions 10a, 4a and connected by nuts 10b, 4b,
At this time, the connecting portion between the second ram 4 and the connecting plate 16 is such that the connecting plate 16 can freely rotate relative to the second ram 4, for example, by providing a bearing between them, or by providing a threaded portion 4a of the connecting plate 16. The connection is made by a well-known structure such as forming a fitting hole into a hollow hole. On the other hand, the second rod 10 and the connecting plate 16 may be integrally connected in a fixed state, but it is preferable that the fitting hole for the threaded portion a of the connecting plate 16 be formed as a blank hole as shown in the figure. A connecting plate 16 is rotatably connected to the rod 10. The guide member 8 includes
A mounting rod 17 made of a round bar is protruded in the axial direction, and the bracket 1 is attached to this mounting rod 17.
8 is fixed by a cassette screw 18a, and a magnetic proximity operating type detector 19 having a built-in reed switch is attached to the bracket 18 by screwing. A ring-shaped permanent magnet 20 is attached to the rear end of the first rod 9 with adhesive or the like, and when the first rod 9 moves in the axial direction, the permanent magnet 20 is placed in the position of the detector 19. Detector 1 reaches
9 is activated and outputs a signal.
21 is a filter for preventing foreign matter from entering into the first rod 9, and is attached with adhesive.

Referring also to FIGS. 3A to 3C, the first rod 9
A plurality of through holes 22 are provided on the circumferential surface near the tip of the second rod 1 , and an annular groove 23 is provided on the inner circumferential surface near the tip of the guide member 8 that fits into the through holes 22 .
An annular groove 24 is provided on the outer circumferential surface near the rear end of the 0, and this is inserted into the through hole 22.
A spherical lock ball 25 that can exist between the through hole 22 and either of the annular grooves 23, 24 is fitted. These annular grooves 23, 24 are formed with smooth rounded surfaces 23a, 24a from the bottom to the opening in the tip direction, that is, on the withdrawal direction side, and the lock ball 25 is formed along these rounded surfaces 23a, 24a. It is becoming easier to move around.

A cylindrical sliding groove 26 and a ring-shaped spring receiving convex portion 27 are provided on the outer peripheral surface of the tip of the first rod 9, and a ring-shaped stopper portion 29 is provided on the inner peripheral surface of the approximately cylindrical shape. A sliding cap 28 is slidably fitted onto the first rod 9, and
It is biased toward the rear end, that is, toward the entry direction by a compression spring 30. The sliding cap 28 covers the outer periphery of the through hole 22 and locks the lock ball 25 when the through hole 22 comes out of the guide member 8 in the removal direction.
This is to prevent the material from jumping out.
Therefore, the length from the stopper part 29 to the rear end is sufficient to cover the through hole (see Fig. 3C), and the movable stroke is such that the first rod 9 reaches its most retracted position. At this time, the rear end surface of the sliding cap 28 comes into contact with the guide member 8, and the stopper portion 29 moves within the sliding groove 26 toward the distal end while compressing the compression spring 30, but still leaves some movement margin. (See Figure 3A). The compression spring 30 is weak enough to cause only the sliding cap 28 to slide.

A stepped portion 31 with a larger inner diameter is provided on the inner peripheral surface of the first rod 9 near the rear end of the through hole 22, while the rear end of the outer peripheral surface of the second rod 10 is provided with a stepped portion 31 as described above. An engaging portion 3 whose diameter increases from the rear end surface of the annular groove 24
2 is provided, and this engaging portion 32 abuts and engages with the stepped portion 31 during extension, so that the second rod 10 is prevented from slipping out from the first rod 9 any further. In addition, 33 is a sliding material, 34 is a dust wiper, and 35 is a through hole for air venting.

Next, the operation of the above embodiment will be explained. In the state shown in FIG. 1, that is, when the cylinder 1 is most contracted, the detector 19 is in an inactive state because the permanent magnet 20 is separated. From this state, cylinder 1
For example, when the first ram 3 and the second ram 4 begin to extend in this order, the first rod 9 is connected to the guide member 8 by the lock ball 25 and cannot be moved, so the second rod 10 first The rod 9 slides on the inner peripheral surface and moves in the removal direction (see Fig. 3A).
Then, the second rod 10 connects the annular groove 24 to the through hole 2.
When the lock ball 25 reaches the position where it overlaps the two annular grooves 23 and 24, the lock ball 25 becomes able to fit into either of the annular grooves 23 and 24. At this time, the engaging portion 32 engages with the stepped portion 31, and the first rod 9 Start moving with Rod 10. Then, the lock ball 25 moves along the rounded surface 23a, exits the annular groove 23, and enters the annular groove 24 (see FIG. 3B). As the first rod 9 comes out, the sliding cap 28 moves in the opposite direction and the through hole 22
As soon as the lock ball 25 comes out of the guide member 8, it is covered by the sliding cap 28, and the lock ball 25 is prevented from flying outward (see FIG. 3C). When the cylinder 1 reaches its maximum extension, the permanent magnet 20 provided at the rear end of the first rod 9 approaches the detection range of the detector 19, and the detector 19 is activated to output a signal.

When the cylinder 1 starts to contract, the second rod 10
The two rods move simultaneously, but since the first rod 9 and the second rod 10 are connected by the lock ball 25, the first rod 9 also moves integrally in the entry direction at the same time (see Fig. 3C). Therefore, detector 1
9 becomes inactive immediately. When the through hole 22 reaches inside the guide member 8, the sliding cap 28 comes into contact with the guide member 8 and slides on the outer peripheral surface of the first rod 9 while compressing the compression spring 30 (see FIG. 3B). ), the lock ball 25 eventually moves into the annular groove 23.
It becomes possible to insert it inside. Then, the lock ball 25 moves along the rounded surface 24a,
It comes out of the annular groove 24 and enters the annular groove 23, and the first rod 9 and the guide member 8 are connected by the lock ball 25, and only the second rod 10 slides inside the first rod 9. (See Figure 3A). At this time, the position where the first rod 9 stops with respect to the guide member 8 is the radiused surface 2.
3a, 24a, the position and quantity of the lock balls 25, the magnitude of sliding friction resistance between the first rod 9 and the second rod 10, the guide member 8 and the sliding cap 28, and the strength of the compression spring 30. In any case, the stopper portion 29 always stops at the position where it comes into contact with the front end side surface of the sliding groove 26, although it is determined depending on the position.

When the first rod 9 and the second rod 10 move relative to each other, the air between them communicates with the outside air through the communication hole 35 and the filter 21, and does not interfere with the operation. Further, dirt, dust, etc. in the outside air are filtered by the filter 21 and kept clean within the first rod 9. The operating position of detector 19 can be adjusted by loosening set screw 18a and moving bracket 18 along mounting rod 17. In addition, by attaching a plurality of detectors 19, for example, embedding another permanent magnet in the second rod 10, and appropriately setting the axial positions of these permanent magnets and the detectors, it is possible to obtain the maximum contraction of the cylinder 1. It is also possible to detect position.

On the other hand, by driving the rotary drive source 15 at any stroke position of the cylinder 1, that is, at any linear operation position of the connecting plate 16, the drive gear 1
4. The rod device 7 rotates around the axis of the cylinder 1 via the driven gear 13 and the connecting member 11, and as a result, the connecting plate 16 also rotates around the axis of the second ram 4. At this time, since the connecting portion between the connecting plate 16 and the second ram 4 is connected so that the connecting plate 16 can freely rotate with respect to the second ram 4,
Although the connecting plate 16 rotates, the second ram 4 does not rotate. That is, only the connecting plate 16 is connected to the second ram 4.
It is now possible to perform linear and rotational operations in any sequence around the axis.
Therefore, if a suitable attachment such as a well-known manipulator arm is integrally provided on the connecting plate 16, the purpose of manipulating the load by linear and rotational operation of the attachment can be achieved. For example, it can be used for a traverser or a handling device.

In the embodiment described above, since the telescopic rod device 7 is used, the axial mounting dimension is short, and the advantages of the telescopic cylinder 1 can be fully utilized. The position of the detector 19 is easy to adjust, and multiple detectors can be installed. Also, since the detector 19 operates without contact due to the permanent magnet 20, no excessive force is applied, making the rod device lightweight and compact. can be taken as a thing. The lock ball 25 is connected to the through hole 22 and one of the annular grooves 23,
24, the operating order of the first rod 9 and the second rod 10 is reliably determined, so that the detector 19 will not malfunction. Each annular groove 23, 24 has a rounded surface 23.
a, 24a are formed, the movement of the lock ball 25 is performed smoothly. Sliding cap 28
Therefore, the lock ball 25 will not fly out.

In the above embodiment, the guide member 8, the first rod 9, and the second rod 10 are made of aluminum alloy, and the sliding cap 28 and the sliding member 33 are made of synthetic resin, so that operation without lubrication is possible. ing. However, these materials can be selected as appropriate at the time of design. For example, if a switch operated by mechanical contact is used as the detector 19, the first rod 9 and the second rod 10 may be made of magnetic material. The second rod 10 may be cylindrical and each part may be constructed as a combination of suitable parts. By making the tip end of the guide member 8 longer than the annular groove 23, the lock ball 25 will not pop out within that range.
It is also possible to omit the sliding cap. The annular grooves 23 and 24 can also be formed into a plurality of recesses that are discontinuous in the circumferential direction. It is also possible to move the lock ball 25 using gravity by appropriately selecting its mounting position. It is also possible for the lock ball 25 to be cylindrical.

In the above-described embodiment, the drive gear 14 and the rotary drive source 15 are used as the drive means, but a rack and a fluid pressure cylinder for linearly reciprocating the rack may be used instead. Alternatively, the driven gear 13 may not be provided in the ring portion 12, and a driving fluid pressure cylinder that is telescopically driven may be installed at a suitable location on the connecting member 11, for example, between a lever protruding from the ring portion 12 and the cylinder 1. good.

In this embodiment, a two-stage cylinder and detection rod are used, but a three-stage cylinder or more is also possible. In that case, the structure of the relationship between the first rod 9 of the detection rod and its surroundings may be changed to the second rod 1.
It may be applied to the relationship between 0 and its surroundings. Also,
Of course, the cylinder may be of a single acting type. Moreover, the detector 19, the permanent magnet 20, etc. can be omitted as appropriate.

In the above-described embodiment, the cylinder 1 and the rod device 7 are both telescopic type, but the present invention can also be applied to a non-telescopic type.

(Effect of idea) According to the present invention, the following effects are achieved.

The connecting plate can move linearly and rotatably in any sequence, so by attaching an attachment such as a well-known manipulator to the connecting plate, it can be applied to automatic machines that require three-dimensional work. can.

The connecting plate is rotatably connected to the ram of the fluid pressure cylinder that allows it to work in a straight line, so even though the connecting plate rotates, the ram does not rotate and only operates linearly. The sealing property between the cylinder tube and the cylinder tube is good, and therefore it can be used stably for a long period of time.

The connecting plate is connected to a rod device consisting of a guide member and a rod member that slides within the guide member, and the guide member is fitted onto the outer periphery of the rod cover of the hydraulic cylinder so that it can only be driven in rotation;
The connecting plate is rotatably operated by the guide member, and the internal structure of the fluid pressure cylinder can be a normal linear ram type, so it can be used not only as a single-acting type but also as a telescopic type. Hydraulic cylinders may also be employed, allowing long stroke linear operation.

The connecting plate is connected to a rod device consisting of a guide member and a rod member that slides inside the guide member, and these rotate together, and the rod connected to the connecting plate is rotated in the middle of the integral rotation or at the end of the rotation. Since the member is designed to slide within the guide member, by providing a detection device between the guide member and the rod member, the linear operating position of the connecting plate can be easily adjusted to a free position during rotational operation. can be detected accurately and accurately.

[Brief explanation of drawings]

1 to 3 show an embodiment of the present invention, in which FIG. 1 is a partially sectional side view of a telescope type fluid pressure cylinder device, and FIG. 2 is a side view of the rod device shown in FIG. 1. The arrow views and FIGS. 3A to 3C are enlarged cross-sectional views of the main parts of the rod device for explaining the operating state. DESCRIPTION OF SYMBOLS 1... Cylinder (fluid pressure cylinder), 4... Second ram (ram), 5... Rod cover, 7... Rod device, 8... Guide member, 9... First rod (rod member), 10... ...Second rod (rod member), 11...Connecting member, 12...Ring part, 1
3... Driven gear, 14... Drive gear, 15... Rotary drive source, 16... Connection plate.

Claims (1)

[Claims for Utility Model Registration] 1. The rod device consists of a guide member and a rod member that slides within the guide member, and the rod device is arranged so that the axes of the rod device and the hydraulic cylinder are parallel to each other. The guide member is integrally provided with a connecting member having a ring portion rotatably fitted to the outer periphery of the rod cover of the fluid pressure cylinder, and the guide member is connected to the rod cover through the connecting member in the axial direction. Although it is immovable, it is mounted so as to be rotatable in the circumferential direction around the axis of the fluid pressure cylinder, and is provided with a drive means for rotationally driving the guide member relative to the rod cover. The distal end of the member is connected to the distal end of the ram of the hydraulic cylinder by a connecting plate so as to move integrally with each other in the axial direction, and the connecting plate axially moves the ram of the hydraulic cylinder by rotation of the guide member. What is claimed is: 1. A fluid pressure cylinder device, characterized in that the connecting portion between the connecting plate and the ram is configured such that the connecting plate is rotatable relative to the ram. 2. The fluid pressure cylinder device according to claim 1, wherein the fluid pressure cylinder is a telescope type fluid pressure cylinder, and the rod device is a telescope type fluid pressure cylinder.