KR20120092263A

KR20120092263A - Multi-sectional cushioning cylinder

Info

Publication number: KR20120092263A
Application number: KR1020110012194A
Authority: KR
Inventors: 이성열
Original assignee: 이성열
Priority date: 2011-02-11
Filing date: 2011-02-11
Publication date: 2012-08-21

Abstract

The present invention is to provide a multi-stage cushion collar to the cylinder with an air cushion to form a multi-stage cushioning structure between the air cushion and the rod to a multi-stage buffer cylinder to significantly reduce operating noise and significantly reduce the load on the air cushion It starts. The present invention is provided with a piston rod inside the cylinder chamber, the piston head mounted on the piston rod is moved to one side by hydraulic or pneumatic, and an air pocket is provided inside the cylinder chamber to cushion the driving shock of the piston rod. In the cylinder which can be characterized in that between the piston rod and the piston head is characterized in that the cushion collar formed to have a diameter gradually increasing in the axial direction.

Description

Multi-sectional cushioning cylinder

The present invention relates to a multi-stage shock absorbing cylinder, and more particularly, by providing a multi-stage cushion collar to a cylinder with an air cushion to form a shock absorbing structure between the air cushion and the rod in multiple stages, thereby significantly reducing operating noise and engaging the air cushion. The present invention relates to a multistage shock absorbing cylinder that can significantly lower the load.

In general, the cylinders used generally operate in a linear motion in two positions, a forward end and a reverse end, and there is an increasing demand to move the stroke of the cylinder at high speed to increase productivity at the production site.

In the case of the cylinder used as described above, the inertia force generated when the piston is moved causes an impact beyond the allowable absorbing capacity between the piston and the cylinder cover when the piston is moved to the position toward the stroke end. Therefore, the conventional cylinder needs to quickly absorb the inertial force of the piston and the resulting impact and repulsive force.

On the other hand, the conventional air cylinder has a cylinder body and a cylinder cover for sealing each end of the body. In addition, a metal piston connected to the rod is slidably embedded in the cylinder body. In addition, the piston is configured to divide the pressure chamber in the cylinder, and the cushioning material is disposed between the inner surface of each cylinder cover and the piston. Therefore, the piston can absorb the temporary impact to some extent by the packing member which is a separate cushioning material.

However, these conventional air cylinders By absorbing the shock by adjusting the amount of air exhausted from the moment the packing member as a shock absorbing material fixed to the fixing body is in contact with the cushion collar, it does not sufficiently absorb the shock due to inertia during high speed operation, and to the opposite side. When operating, there is a disadvantage that it gets stuck in the packing or the initial working pressure increases during operation. The shock absorbing packing member is shortened in life due to the accumulation of fatigue stress over time. Therefore, the packing member, which is a cushioning material, needs to be periodically replaced again after a certain time.

The present invention has been made to solve the above problems, by providing a multi-stage cushion collar to the cylinder with an air cushion to form a shock absorbing structure between the air cushion and the rod in multiple stages to significantly reduce operating noise during initial operation of the cylinder It enables low pressure operation, reduces the phenomenon of popping out of the cushion section, and reduces the load on the cushion to prevent repulsion from the air cushion section when the cylinder operates at high speed, and has a multi-stage buffer cylinder that can gently absorb inertia energy. The purpose is to provide.

According to one embodiment of the present invention for achieving the above object, a piston rod is provided inside the cylinder chamber, the piston head mounted on the piston rod is moved to one side by hydraulic or pneumatic, and inside the cylinder chamber In the cylinder which is provided with an air pocket to buffer the driving shock of the piston rod, there is provided a multi-stage buffer cylinder with a cushion collar formed to have a diameter gradually increasing in the axial direction between the piston rod and the piston head.

The cushion collar is characterized in that it has a step of gradually larger diameter in one direction.

It is preferable that the tip end surface of the step is bent to reduce the impact with the air cushion.

The cushion collar may be one having an inclined portion having a larger diameter gradually toward one side.

According to the present invention, by providing a multi-stage cushion collar to the cylinder with an air cushion to form a multi-stage buffer structure between the air cushion and the rod Reducing the initial operating pressure at the start of the cylinder makes the reciprocating operation speed high, and absorbs the impact energy step by step to reduce the repulsive force during the operation of the air cushion, reducing the operating load smoothly and significantly reducing the operating noise. have.

1 is an exemplary view showing a configuration of a multistage buffer cylinder according to an embodiment of the present invention;
2 is an exemplary view showing an operating state when compressed air is injected into a port of a multistage buffer cylinder according to an embodiment of the present invention;
3 is an exemplary view showing a state when the piston rod of the multi-stage shock absorbing cylinder according to an embodiment of the present invention is moved completely;
4 is an exemplary view showing a cushion collar of a multi-stage buffer cylinder according to an embodiment of the present invention, and
5 is an exemplary view showing a cushion collar of a multistage buffer cylinder according to another embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, the present invention includes a piston rod 10, air cushions 20 and 22, a cylinder chamber 30, and cushion collars 40 and 42.

The cylinder chamber 30 is provided with a first port 15 and a second port 16 on both sides. Compressed air injection nozzles may be connected to these ports 15 and 16 to serve as a passage for injecting compressed air into the cylinder chamber 30.

The piston rod 10 is installed to the left and right to move in the cylinder chamber (30). In addition, a plurality of rod packings 11 may achieve a sealed state. In addition, the piston head 50 is installed in the middle, and the compressed air supplied through the ports 15 and 16 presses the piston head 50 to one side, thereby allowing the movement of the piston rod 10.

The air cushion 20 is installed at both sides of the interior of the cylinder chamber 30 to abut on the outer circumferential surface of the piston rod 10. The air cushion 20 serves as a normal needle valve to cushion the movement shock by controlling the displacement of the compressed air through the piston rod 10 and the piston head 50 which are moved by the compressed air.

That is, when compressed air is injected into the second port 16 as shown in FIG. 2, the piston head 50 moves to one side by the compressed air. At this time, the sudden sudden movement of the piston rod 10 is generated by the air cushion 20, the repulsion force is generated.

Therefore, a cushion collar 40 or 42 may be installed between the piston rod 10 and the piston head 50.

Specifically, the cushion collar 40 may be formed in multiple stages having a gradually wide diameter as shown in FIG. That is, the first end A positioned at the front end of the cushion collar 40 has the smallest diameter D1, and the second end B and the third end C extending to the first end A. Diameters D2 and D3 are formed to have an increasingly large diameter.

Accordingly, when the piston head 50 is moved to one side by the compressed air, the first end A having the smallest diameter D1 is introduced into the air cushion 20. At this time, the first end A and the air cushion A gap is formed between the parts 20, and a part of the compressed air is exhausted by the gap, and the pressure inside is increased, thereby acting primarily as a buffer. After the second stage (B) and the third stage (C) is introduced into the air cushion 20, as the diameter gradually increases, the gap with the air cushion 20 also becomes smaller, thereby The amount of compressed air exhausted through the gap is also reduced.

Therefore, the moving speed of the piston rod 10 is the fastest when the first end A passes through the air cushion 20, and then the moving speed gradually decreases toward the second end B and the third end C. Multi-stage buffering can be expected.

On the other hand, the cushion collar 40 having such a function can be provided on both sides (the cushion collar of the other side 42) on the basis of the piston head 50, even if the compressed air is provided to the first port 15 has the same effect You can expect

In addition, although not shown in the drawings, the tip of each step of Figure 4 is preferably chamfered in a round shape in order to reduce the load during contact of the air cushion 15.

Further, in addition to forming the first stage (A) to the third stage (C (multiple stages may be formed) with a step as shown in Figure 4), as shown in Figure 5 to remove the step and a plurality of inclined steps (A It is also possible to form from 'to C').

As such, the present invention gradually increases the diameter of the cushion collar 40 passing through the air cushion 20 so that the gap between the air cushion 20 and the piston rod 10 during the movement of the piston rod 10 is increased. By gradually narrowing the size, it is possible to gradually reduce the moving speed of the piston rod 10. Therefore, the shock or repulsive force generated in the piston rod 10 and the air cushion 20 by sudden movement in the past can be solved through a multi-stage buffering action.

While the present invention has been particularly shown and described with reference to the particular embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

10: piston rod 11: rod packing
12: cylinder tube 15: first port
16: port 2 20: air cushion
22: air cushion 30: cylinder chamber
40: cushion collar 50: piston head

Claims

A cylinder rod is provided inside the cylinder chamber, and the piston head mounted on the piston rod is moved to one side by hydraulic or pneumatic pressure, and an air pocket is provided inside the cylinder chamber to cushion the driving shock of the piston rod. To
And a cushion collar formed between the piston rod and the piston head to have a diameter gradually increasing in the axial direction.

The method of claim 1,
The cushion collar is a multi-stage buffer cylinder characterized in that it has a step of gradually larger diameter toward one side.

The method of claim 2,
Multi-stage buffer cylinder characterized in that the front end surface of the step is curved.

The method of claim 1,
The cushion collar is a multi-stage buffer cylinder characterized in that it has an inclined portion having a larger diameter gradually toward one side.