JPH0519608U - Air cylinder equipped with cushion device - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the impact at the end of the air cylinder stroke. It also controls the speed at the start. [Structure] A permanent magnet is fixed to the piston, coils are arranged on the cylinder head and the rod-side head, and the coils are energized to generate a repulsive force between the piston and the piston. The impact is mitigated by reducing the operating speed.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to an air cylinder equipped with a cushion device.

[0002]

[Prior Art]

 Conventionally, air cylinders have the drawback that at the end of the stroke, the piston collides with the cylinder member and an impact is generated.To alleviate this impact, a cushioning material such as a spring or a needle is placed between the piston and the member. A valve or the like is interposed to absorb the impact.

[0003]

[Problems to be solved by the device]

 However, in the case where the cushioning material such as the spring is used, the operating force of the air cylinder is reduced due to the repulsive force of the cushioning material such as the spring, and the cushioning effect of the cushioning effect is required unless the cushioning material such as the spring is replaced. There is a problem that the strength cannot be adjusted and the structure becomes complicated.

Further, the needle valve type has a problem that it is difficult to perform fine adjustment and that it is difficult to make an adjustment after it is incorporated in a device.

[0005]

[Means for Solving the Problems]

 In the present invention, a piston with one end of a rod fixed is fitted inside the cylinder body, and both ends of the cylinder body are closed by a cylinder head and a rod side head through which the rod is slidably inserted. In an air cylinder that enables reciprocating operation of the piston and the rod fixed to it by sending pressurized air from the port formed in the head and the rod-side head, a permanent magnet is attached to the piston. The present invention provides an air cylinder equipped with a cushion device characterized in that the coils are fixed to the cylinder head and the rod-side head, respectively.

[0006]

【Example】

 An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows an air cylinder A equipped with a cushion device according to the present invention, in which a piston 3 having one end of a rod 2 fixed therein is fitted into a substantially cylindrical cylinder body 1 to form the cylinder body. Both ends of 1 are closed by a cylinder head 4 and a rod-side head 5 slidably inserted through the rod 2, respectively, and added from ports 6 and 7 formed in the cylinder head 4 and the rod-side head 5. By feeding the compressed air, the piston 3 and the rod 2 fixed to the piston 3 can be reciprocated.

In the figure, 8 is a guide bush for guiding the reciprocating operation of the rod 2, and 9 and 21 are packings.

The cushion device of the present invention comprises permanent magnets 11 and 12 fixed to the front and rear side surfaces of a piston body 10, and coils 15 and 16 arranged on the cylinder head 4 and the rod-side head 5. There is.

The permanent magnets 11 and 12 are formed in a substantially disc shape with a rod insertion hole formed in the center, and the direction of magnetic force lines is made to coincide with the thickness direction, that is, the operating direction of the piston 3.

Reference numeral 13 is a nut for attaching the piston 3 and the permanent magnets 11 and 12 to the rod 2, and 14 is a packing.

The coils 15 and 16 are externally fitted to cylindrical extending portions 17 and 18 formed in the outer center portions of the cylinder head 4 and the rod-side head 5, respectively, and the coils 15 and 16 are energized. The magnetic field lines that match the operating direction of the piston 3 are generated. Reference numeral 19 is a cover that covers the outside of the coils 15 and 16.

The embodiment of the present invention is configured as described above, and various devices are connected to one end of the rod 2 via the nut 20 by sending pressurized air from the port 6 or 7. (Not shown) can be reciprocally operated. Particularly, at the end of the reciprocating operation of the air cylinder A, the following effects can be obtained by the interaction between the permanent magnets 11 and 12 and the coils 15 and 16. You can

By energizing the coils 15, 16 so that the direction of the magnetic lines of force generated by the coils 15, 16 oppose the direction of the lines of magnetic force of the permanent magnets 11, 12, the permanent magnets 11, A repulsive force is generated between the coil 12 and the coils 15 and 16, and the operating speed toward the end of the piston 3 can be reduced. In particular, the repulsive force is inversely proportional to the square of the distance between the permanent magnets 11 and 12 and the coils 15 and 16, so that the piston 3 rapidly increases and effectively increases as the piston 3 approaches the end. Shock can be mitigated.

At the start of the operation of the piston 3, the coil behind the piston 3 is energized so that the direction of the lines of magnetic force generated by the coil opposes the direction of the lines of magnetic force of the permanent magnets 11 and 12, and a repulsive force is generated. By generating them, the speed at the time of starting the piston 3 can be increased and the operation cycle can be accelerated.

Further, when the piston 3 is started up, the rear coil is energized to generate an attractive force so that the direction of the magnetic force line generated by the coil is the same as the direction of the magnetic force line of the permanent magnets 11 and 12. It is also possible to slow down the speed of and slow start.

In addition, by connecting a control device (not shown) to the coils 15 and 16 and controlling the voltage, current, direction, time, etc., to be applied to each coil 15 and 16 by the control device. By generating a desired repulsive force or attractive force and adding this repulsive force or attractive force to the original operating force of the air cylinder A, the operating force and operating speed of the cylinder A at the stroke end can be controlled.

Further, the cylinder head 4 and the rod-side head 5 are formed of a permanent magnet, and a coil is externally fitted to the outer circumference of the cylinder head 4, and the current to the coil is controlled by the above-described control device, thereby making it larger. Repulsive force or attractive force can be generated to more strongly control the operation of the air cylinder A.

As described above, since the operating speed of the air cylinder A can be controlled by the control device, the operating speed can be easily adjusted, and further, two sensors are provided in the middle of the cylinder body 1. By detecting the passage time of the piston 3, the operating speed of the piston 3 is detected, and the voltage, current, etc., which are applied to the coils 15 and 16 are controlled based on this, thereby controlling the operating speed during the stroke. A high degree of control automation can be achieved.

In addition, in the above-described configuration, by forming a ring-shaped or axial fin on the cover 19 of each coil 15 and 16, for example, heat generation of the coils 15 and 16 is suppressed and stable performance is exhibited. Can be made.

Further, by forming the cylinder head 4 and the rod-side head 5 with a laminated silicon steel plate, a sintered metal oxide or the like, the magnetic permeability is increased and the magnetic hysteresis is decreased, and the cushioning effect is increased. Moreover, the response of the electromagnetic force control by the control device can be improved.

Further, by disposing the ports 6 and 7 on the opposite side of the magnetic force acting surface, the disturbance of the magnetic force lines can be eliminated and the control response can be enhanced. Furthermore, the cylinder head 4 and the rod side head 5 By forming the coil groove in the coil, the coil can be bobbinless.

[0023]

[Effect of the device]

 According to the present invention, the cylinder body, the piston fitted therein, the rod having one end fixed to the piston, the cylinder head closing one end of the cylinder body, and the other end of the cylinder body closing. Moreover, in the air cylinder including the rod-side head in which the rod is slidably inserted, the permanent magnet is fixed to the piston, and the coils are provided in the cylinder head and the rod-side head, respectively. Then, at the end of the stroke of the piston, the coil is energized to generate a repulsive force between the piston and the coil, and the repulsive force reduces the operating speed of the piston, thereby alleviating the impact at the end of the stroke. it can.

Further, at the time of starting from the stroke end, by controlling the direction of the magnetic force lines of the coil, it is possible to perform control such as increasing the speed of slow start or start.

[Brief description of drawings]

FIG. 1 is an explanatory longitudinal sectional view of an air cylinder equipped with a cushion device according to the present invention.

[Explanation of symbols]

 A Air cylinder 1 Cylinder body 3 Piston 2 Rod 4 Cylinder head 5 Rod side head 6, 7 Port 11, 12 Permanent magnet 15, 16 Coil

Claims (1)

[Scope of utility model registration request] 1. A piston 3 having one end of a rod 2 fixed therein is fitted into the inside of the cylinder body 1 to form the cylinder body 1.
Both ends of the cylinder head 4 and the rod 2 respectively.
Is closed by the rod-side head 5 that is slidably inserted, and pressurized air is sent from ports 6 and 7 formed in the cylinder head 4 and the rod-side head 5 to feed the piston 3 and this In an air cylinder A capable of reciprocating the fixed rod 2, the permanent magnets 11 and 12 are fixed to the piston 3, and the coil 1 is attached to the cylinder head 4 and the rod side head 5, respectively.
An air cylinder equipped with a cushion device in which 5 and 16 are provided.