JP4152522B2 - Diaphragm cylinder - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a diaphragm cylinder in which a main shaft is reciprocated in a linear direction by a fluid such as compressed air.
[0002]
[Prior art]
As a pneumatic cylinder in which a main shaft and a rod are reciprocated in a linear direction by compressed air, there is one in which a piston rod is provided on a piston that can be reciprocated in a cylinder body. In this type of pneumatic cylinder, the compressed air is supplied to the pneumatic chambers formed on both sides of the piston to reciprocate the piston rod, and compressed into the pneumatic chamber formed on one side. There is a single-acting type in which air is supplied and a spring is incorporated on the other side.
[0003]
[Problems to be solved by the invention]
Regardless of the type, the piston comes into sliding contact with the inner peripheral surface of the cylinder chamber formed in the cylinder body, so that when the piston is driven, sliding resistance is applied to the piston. At the same time, the sealing material provided on the outer peripheral surface of the piston is worn by aging.
[0004]
Therefore, if the main shaft, that is, the rod, is attached to the diaphragm provided in the cylinder body and the main shaft is driven by the diaphragm, the sliding portion is eliminated, so that the main shaft can be driven even if the air pressure is lowered. In addition, there is an advantage that the wear of the sealing material can be prevented.
[0005]
However, even in a cylinder using a diaphragm, if the diaphragm is twisted in the rotational direction or the main shaft is inclined, the life of the diaphragm is shortened, and there is a limit to improving its durability.
[0006]
In addition, the stopper for restricting the forward / backward limit position of the main shaft collides with the stopper receiver as the main shaft reciprocates, so that when the stopper and the stopper receiver are worn, wear powder is generated from that portion. Thus, it has been found that the wear powder remains inside the cylinder body and damages the diaphragm, shortening the life of the diaphragm and hindering the improvement of its durability.
[0007]
An object of the present invention is to improve the durability of a diaphragm by preventing the diaphragm from bending and tilting.
[0008]
Another object of the present invention is to improve the durability of the diaphragm by preventing abrasion powder in the cylinder from adhering to the diaphragm.
[0009]
[Means for Solving the Problems]
The diaphragm cylinder of the present invention includes a cylinder body in which a spring chamber and a pressurizing chamber are formed, and a diaphragm that divides the spring chamber and the pressurizing chamber is mounted, and is fixed to the diaphragm and passes through the spring chamber. A main shaft protruding outside the cylinder body, a guide pin that engages with a guide groove formed in the main shaft and guides the linear movement of the main shaft, and is mounted on the outside of the main shaft to apply centripetal force to the main shaft. A conical coil spring that applies a spring force in a retreating direction, and a forward-side stopper that is attached to the main shaft and restricts the forward limit position of the main shaft by the fluid supplied to the pressurizing chamber. And
[0010]
The forward stopper may be positioned in the pressurizing chamber and attached to the main shaft, and a stopper receiver that contacts the forward stopper may be provided in the pressurizing chamber, and the backward limit position of the main shaft is regulated. A retreat-side stopper that is positioned outside the cylinder body may be attached to the main shaft, and the retreat-side stopper may be brought into contact with the outer surface of the cylinder body.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0012]
1 is a cross-sectional view of a diaphragm cylinder according to an embodiment of the present invention, FIG. 2 is a front view seen from the direction of arrow A in FIG. 1, and FIG. 3 is a rear view seen from the direction of arrow B. .
[0013]
This diaphragm cylinder has a cylinder body 13 including a base plate 11 attached to a support member 10 indicated by a two-dot chain line, and a casing 12 fixed thereto. The base plate 11 and the casing 12 are fastened by the two bolts 14 shown in FIG. 2, and the cylinder body 13 is formed with bolt mounting holes 15 for fastening bolts for mounting to the support member 10. As shown in FIGS. 2 and 3, 13 has flat both side surfaces and arc-shaped end surfaces, and has a substantially rectangular parallelepiped shape as a whole.
[0014]
A diaphragm 16 made of a flexible member such as rubber is mounted in the cylinder body 13, and a spring chamber 17 is formed in the cylinder body 13 by the recess formed in the center of the casing 12 and the diaphragm 16. A pressurizing chamber 19 is formed by the cylindrical portion 18 of the base plate 11 and the diaphragm 16. As described above, the diaphragm 16 divides the spring chamber 17 and the pressurizing chamber 19. The diaphragm 16 has an annular portion 16a that enters a recess formed in the casing 12, an inner and outer cylindrical portion 16b that is bent in a U shape, and a central flat portion 16c, which are integrated.
[0015]
A diaphragm pad 21 having a U-shaped cross section is disposed on the diaphragm 16 so as to be located on the spring chamber side. A rod slidably mounted on the cylinder body 13, that is, a rear end surface of the main shaft 22 is in contact with the diaphragm pad 21. The distal end side penetrates the spring chamber 17 and protrudes outside the cylinder body 13.
[0016]
An operating member 23 having a larger outer diameter than this is attached to the tip of the main shaft 22, and when the main shaft 22 is moved up and down with the operating member 23 facing upward, a driven member provided on the operating member 23. Can be moved up and down, and when it is set downward, the driven member provided below can be moved up and down. Further, when the main shaft 22 is reciprocated in the horizontal direction or the inclined direction, the operating member 23 is reciprocated in the horizontal direction or the inclined direction. A bearing 24 is attached to the casing 12 to guide the sliding of the main shaft 22.
[0017]
A screw hole is formed in the rear end portion of the main shaft 22, and the main shaft 22 is fixed to the diaphragm 16 by fastening the retainer 25 located in the pressurizing chamber 19 and the main shaft 22 with bolts 26 sandwiching the diaphragm 16. The
[0018]
A conical compression coil spring 27 is mounted in the spring chamber 17. The small diameter end of the conical compression coil spring 27 is on the diaphragm 16 side, and the large diameter end is on the cylinder body 13 side. ing. Thus, by attaching the conical compression coil spring 27 to the outside of the main shaft 22, a spring force is applied to the main shaft 22 in the backward direction, and the spring force that directs the center of the main shaft 22 toward the center of the cylinder body 13. Is added to obtain the aligning function of the main shaft 22. In addition, even if the positions of the small diameter end portion and the large diameter end portion are reversed, the centripetal force on the main shaft 22 can be similarly increased.
[0019]
In this way, the main shaft 22 is provided with a centering function by the conical compression coil spring 27, so that centripetal force is applied to the main shaft 22 to prevent its center misalignment, and an unnecessary load is applied to the diaphragm 16. Can be prevented, and the life of the diaphragm 16 can be extended.
[0020]
In order to regulate the retreat limit position of the main shaft 22 by the spring force of the conical compression coil spring 27, a stopper surface 28 with which the operating member 23 contacts is formed on the outer surface of the cylinder body 13 when the main shaft 22 reaches the retreat limit position. Yes. That is, the actuating member 23 has a function as a backward stopper for restricting the backward limit position.
[0021]
The main shaft 22 is driven forward by compressed air supplied to the pressurizing chamber 19, and the retainer 25 is moved forward in contact with a stopper receiver 31 formed on the base plate 11 in order to regulate the forward limit position. A side stopper 32 is provided. The stopper 32 is formed with a plurality of communication holes 33 for communicating the flow path formed in the support member 10 and the pressurizing chamber 19. The stopper 32 may be formed as a stopper integrally with the retainer 25 without forming it separately from the retainer 25 as shown.
[0022]
Therefore, when compressed air is supplied from the flow path into the pressurizing chamber 19, the pressure of the compressed air flowing into the pressurizing chamber 19 is applied to the diaphragm 16, and the main shaft 22 is driven in the forward direction. At this time, in order to discharge the air in the spring chamber 17 to the outside, the casing 12 is formed with a bleed hole 34 that allows the spring chamber 17 to communicate with the outside. On the other hand, when the air in the pressurizing chamber 19 is discharged, the main shaft 22 is driven to the retreat limit position by the spring force of the conical compression coil spring 27. At this time, air flows into the spring chamber 17 from the outside through the bleed hole 34.
[0023]
The forward limit position of the main shaft 22 is restricted by the stopper 32 coming into contact with the stopper receiver 31. Even if abrasion powder is generated from these portions due to the collision between the stopper 32 and the stopper receiver 31, the compressed air supplied when the main shaft 22 moves forward and the compressed air discharged when the main shaft 22 moves backward enter the pressurizing chamber 19. Therefore, the wear powder is discharged to the outside, and the wear powder is prevented from adhering to the surface of the diaphragm 16.
[0024]
When the main shaft 22 is in the retreat limit position, the actuating member 23 comes into contact with the stopper surface 28 provided on the outer surface of the cylinder body 13, so even if wear powder is generated from these portions, the wear powder is added. The wear powder is prevented from adhering to the surface of the diaphragm 16 without entering the pressure chamber 19.
[0025]
As described above, it is possible to prevent the abrasion powder from adhering to the surface of the diaphragm 16, thereby extending the life of the diaphragm 16 and improving the durability of the diaphragm 16.
[0026]
A guide groove 35 is formed in the main shaft 22 along the axial direction, and a guide pin 36 that engages with the guide groove 35 is fixed to the casing 12. As a result, when the main shaft 22 reciprocates in the linear direction, the main shaft 22 is guided by the guide pin 36. Therefore, a load in a direction in which the main shaft 22 rotates together with the diaphragm 16 is applied to the diaphragm 16, or the main shaft 22 Therefore, it is possible to prevent the load in the direction of tilting from being applied, thereby extending the life of the diaphragm 16 and improving its durability. The guide groove 35 may be a groove with a bottom, or may be a groove penetrating in the radial direction of the main shaft 22. A plurality of guide pins 36 may be provided.
[0027]
In the diaphragm cylinder having such a configuration, when compressed air is supplied into the pressurizing chamber 19, the main shaft 22 is moved forward by being pressurized by the diaphragm 16, and when the compressed air is discharged, it is moved backward by a spring force. become. Since there is no need to provide a seal material between the bearing 24 and the main shaft 22, the main shaft 22 can be driven even at a low pressure without applying a large sliding resistance to the main shaft 22.
[0028]
When the main shaft 22 is reciprocated, the main shaft 22 is guided by the guide pin 36, so that the main shaft 22 is not tilted and is centered by the conical compression coil spring 27. Eccentric movement is prevented and reciprocation occurs. Thereby, it is possible to prevent an unnecessary load from being applied to the diaphragm 16. In addition, since the stopper that regulates the forward limit position and the reverse limit position of the main shaft 22 can be prevented from adhering to the diaphragm, damage to the diaphragm 16 due to the adhering wear particles to the diaphragm 16 can be prevented. can do.
[0029]
It goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, in the illustrated case, the main shaft 22 is moved forward by compressed air, but may be moved forward by the pressure of a liquid such as hydraulic pressure.
[0030]
【The invention's effect】
According to the present invention, twisting and bending of the diaphragm that drives the main shaft is prevented, and the centripetal property of the main shaft is improved. As a result, the diaphragm is prevented from being twisted, bent, or eccentric, and the life of the diaphragm can be extended and its durability can be improved. The abrasion powder generated by the stopper that restricts the movement of the main shaft is prevented from adhering to the diaphragm, so that the diaphragm can be prevented from being damaged and its durability can be improved.
[Brief description of the drawings]
FIG. 1 shows a diaphragm cylinder according to an embodiment of the present invention, and is a cross-sectional view taken along line CC in FIG.
FIG. 2 is a front view seen from the direction of arrow A in FIG.
FIG. 3 is a rear view seen from the direction of arrow B in FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Support member 11 Base plate 12 Casing 13 Cylinder main body 14 Bolt 15 Bolt attachment hole 16 Diaphragm 17 Spring chamber 18 Cylindrical part 19 Pressurization chamber 21 Diaphragm pad 22 Main shaft 23 Actuating member 24 Bearing 25 Retainer 26 Bolt 27 Conical compression coil spring 28 Stopper surface 31 Stopper receiver 32 Stopper 33 Communication hole 34 Bleed hole 35 Guide groove 36 Guide pin

Claims (3)

A cylinder body having a spring chamber and a pressurizing chamber formed thereon, and a diaphragm that partitions the spring chamber and the pressurizing chamber;
A main shaft fixed to the diaphragm and penetrating the spring chamber and projecting outside the cylinder body;
A guide pin that engages with a guide groove formed in the main shaft and guides the linear movement of the main shaft;
A conical coil spring that is mounted on the outside of the main shaft and applies a spring force in a backward direction while applying a centripetal force to the main shaft;
A diaphragm cylinder, which is attached to the main shaft and has a forward-side stopper that regulates the forward limit position of the main shaft by the fluid supplied to the pressurizing chamber. 2. The diaphragm cylinder according to claim 1, wherein the forward stopper is positioned in the pressurizing chamber and attached to the main shaft, and a stopper receiver that contacts the forward stopper is provided in the pressurizing chamber. Diaphragm cylinder. The diaphragm cylinder according to claim 1 or 2, wherein a stopper on a retreating side for restricting a retreat limit position of the main shaft is positioned outside the cylinder main body and attached to the main shaft, and the stopper on the retreating side is attached to an outer surface of the cylinder main body. Diaphragm cylinder characterized in that it is brought into contact with.

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