CN219197983U

CN219197983U - Gas spring of running machine

Info

Publication number: CN219197983U
Application number: CN202222554579.9U
Authority: CN
Inventors: 应端忠; 王立斌
Original assignee: Ningbo Yili Industrial Co ltd
Current assignee: Ningbo Yili Industrial Co ltd
Priority date: 2022-09-22
Filing date: 2022-09-22
Publication date: 2023-06-16
Anticipated expiration: 2032-09-22

Abstract

The utility model discloses a gas spring of a running machine. In order to solve the problem that when the front plate of the running plate is lifted, the rear plate of the running plate is jacked up or vibrates due to the overlarge damping force of the gas spring. According to the utility model, the fixed piston and the floating piston are added to separate the pressure cavity, so that the oil needed to be filled in the pressure cavity is reduced (namely, the compression ratio of the oil is reduced), and the elasticity applied to the piston rod by the oil in the gas spring when the front plate of the running plate is lifted is reduced. The design makes the whole movement more stable when the front plate of the running plate is lifted, and reduces vibration and noise.

Description

Gas spring of running machine

Technical Field

The utility model relates to the field of gas springs, in particular to a gas spring of a running machine.

Background

The gas spring mainly plays a role in buffering and increasing resistance when adjusting the height or the angle in industrial manufacturing. The working principle is that the oil-gas mixture or inert substances in the high-tightness pressure cylinder body are compressed, and meanwhile, the pressure difference is generated on two sides of the piston connected with the piston rod 1 due to different stressed cross sectional areas, so that the functions and the purposes which are needed to be achieved are realized. The filler in the gas spring pressure cylinder body is subjected to different filling designs according to different requirements.

In the treadmill field, the piston rod top of gas spring is fixed in the treadmill deck below, and the pressure cylinder body bottom of gas spring is fixed in the treadmill base top, and when the treadmill was folding, the treadmill deck was in the vertical state promptly, and gas spring was in the extension state. When the running board of the running machine is horizontally placed, the air spring is in a compressed state. The gas spring is used for solving the problem that when the running plate of the running machine is put down, the running plate can safely and stably fall to the ground, so that damping in the gas spring pressure cylinder body is required to be increased, and the damping force generated by the gas spring when the running plate is put down is improved. However, such design easily causes the running machine to need to lift the running board front board, when the running board gradient is formed, the running board rear board is easily jacked up because the gas spring is originally in the high damping force of the compression state, and the running board produces the problem such as vibrations when recovering.

For example, a "gas spring" disclosed in chinese patent publication No. CN 204784384U, which includes a pressure cylinder with closed front and rear ends, a first piston disposed in the pressure cylinder, a piston rod, and an oil-gas mixture filled in the pressure cylinder, wherein one end of the piston rod is connected to the first piston, and the other end passes through the front end of the pressure cylinder; the first piston is provided with a plurality of communication holes penetrating through the front end face and the rear end face of the first piston, the middle part of the end face of the first piston, which faces the rear end of the pressure cylinder body, is provided with an axial boss, and the axial boss is slidably sleeved with an annular floating valve plate; the pressure cylinder body inner side is provided with a pressure relief groove, and the pressure relief groove is close to the rear end of the pressure cylinder body. The design of this patent document has solved to a certain extent and has carried out the lifting when the front bezel of running board, and the back board can't descend after being jacked, but because inside damping oil is big in proportion, and elasticity ratio is high, and damping force changes greatly when receiving the compression, can not solve the problem that the back board can be jacked completely to and can take place the problem of vibrations when descending.

Disclosure of Invention

The utility model mainly solves the problem that the running plate is tilted when the gas spring for the running machine lifts up because the proportion of the internal inert gas to the pressure cylinder body is too small and the elastic force ratio is too high due to the large proportion of damping oil in the gas spring in the prior art.

The technical problems of the utility model are mainly solved by the following technical proposal:

the utility model comprises a fixed piston arranged on the pressure cylinder body, wherein the fixed piston divides the pressure cylinder body into a first pressure cavity and a second pressure cavity, the fixed piston is communicated with the first pressure cavity and the second pressure cavity, and a floating piston is arranged in the second pressure cavity. The separation of pressure chamber and the design of floating piston have effectually solved when the running board front bezel carries out the lifting, because elasticity ratio is too high, and instantaneous damping force changes and makes the ejection force that the piston rod received too big, and the running board back plate that leads to is by the problem of jacking and vibrations problem.

Preferably, the intercepting structure comprises an intercepting channel, one end of the intercepting channel is connected with the first pressure cavity, the other end of the intercepting channel is connected with the second pressure cavity, the intercepting valve plate is arranged at one end of the intercepting channel connected with the first pressure cavity, and a groove is arranged at one end of the intercepting channel connected with the first pressure cavity. The shut-off channel is designed such that damping oil can be forced to move by the stationary piston from the first pressure chamber into the second pressure chamber when the gas spring is compressed.

Preferably, the intercepting structure comprises a throttling groove, the throttling groove is arranged at the edge of the fixed piston, one end of the throttling groove is connected with the first pressure cavity, and the other end of the throttling groove is connected with the groove of the intercepting channel. The design of the throttling groove can enable damping oil to slowly pass through the fixed piston when the gas spring is in a compressed state, so that the height of the damping oil in the first pressure cavity is kept, and an effective buffering effect is achieved when the running plate is vertically and horizontally arranged.

Preferably, the shutoff structure is provided with a valve block positioning groove, one end of the shutoff valve block contacts the valve block positioning groove when the gas spring is in a compressed state, the shutoff valve block covers the shutoff channel, and the length of the shutoff valve block is matched with the throttling groove and the shutoff channel. The design of the shutoff valve block locating groove ensures that the shutoff valve block cannot be flushed away due to the oil pressure in the throttling groove when the oil pressure is overlarge, and the design of the length of the shutoff valve block ensures that the shutoff valve block cannot be stressed from other directions.

Preferably, a rivet is riveted at the center of the fixed piston, and the diameter of the rivet head is matched with the shutoff valve plate. The rivet is designed to limit the position of the shutoff valve plate from being disturbed by oil pressure when the gas spring is restored to an extension state from compression.

Preferably, the second pressure chamber is filled with an inert gas. The design of the filler in the second pressure cavity increases the duty ratio of the air cavity in the pressure cylinder body, and effectively reduces the damping force when the running plate is lifted.

Preferably, a pressure relief groove is formed in the inner side of the first pressure cavity, and the pressure relief groove extends along the axial direction of the first pressure cavity. The design of pressure release groove is in the race board lifting in-process, has effectively timely reduced the oil pressure in the first pressure chamber for the ejection force of piston rod can not become very big in the short time.

Preferably, the outside of the floating piston is wound with an O-shaped ring. The design of the O-shaped ring at the floating piston ensures the air tightness of the air cavity in the second pressure cavity, prevents the air in the second pressure cavity from leaking to the first pressure cavity, and plays a role in ensuring the damping oil height in the first pressure cavity.

Preferably, an O-shaped ring is wound on the outer side of the fixed piston. The design of the O-ring at the fixed piston ensures that damping oil in the first pressure chamber can only pass through the fixed piston from the throttling groove or the intercepting channel.

Preferably, the fixed piston comprises a plurality of intercepting structures, and the intercepting structures are equidistantly and uniformly arranged in radian around the center of the fixed piston. The gas piston is prevented from influencing the use effect due to the inversion of the gas-liquid mixture and the like in different states, and the fault rate is reduced.

The beneficial effects of the utility model are as follows:

the arrangement of the second pressure cavity and the design of the floating piston in the second pressure cavity effectively solve the problems of raising and vibrating of the running board back plate caused by overlarge ejection force of the piston rod due to overlarge elastic ratio of the gas spring.

Drawings

Fig. 1 is a diagram showing the overall connection structure of a gas spring according to the present utility model.

Fig. 2 is a partial construction view of a fixed piston and a closure structure according to the present utility model.

In the figure, a piston rod 1, a piston 2, a fixed piston 3, a floating piston 4, a pressure relief groove 5, damping oil 6, inert gas 7, a first pressure cavity 8, a second pressure cavity 9, a rivet 2.1, a shutoff channel 2.3, a shutoff groove 2.4 and a shutoff valve plate.

Detailed Description

The technical scheme of the utility model is further specifically described below through examples and with reference to the accompanying drawings.

Examples:

the air spring of the running machine in this embodiment, as shown in fig. 1, comprises a piston rod 1, a piston 2, a fixed piston 3, a floating piston 4, a pressure relief groove 5, damping oil 6, inert gas 7, a first pressure cavity 8 and a second pressure cavity 9. The piston rod 1 is hinged with the piston 2, one end of the fixed piston 3 is connected with the first pressure cavity 8, the other end of the fixed piston is connected with the second pressure cavity 9, a pressure relief groove 5 is formed in the right half section of the first pressure cavity 8, and the pressure relief groove 5 is a straight groove formed in the inner side of the first pressure cavity 8 and extends along the axial direction of the first pressure cavity 8. The first pressure cavity is filled with damping oil 6 and inert gas 7, the second pressure cavity 9 is internally provided with a floating piston 4, the floating piston 4 is a piston with high sealing performance, the second pressure cavity 9 is filled with inert gas 7, and the inert gas 7 is filled on the right side of the floating piston 4.

When the running plate of the running machine is vertically retracted (namely, in the extension state of the gas spring), the piston rod 1 and the piston 2 are not pushed into the first pressure cavity 8, the inert gas 7 in the first pressure cavity 8 is not compressed, the damping oil 6 is all in the first pressure cavity 8, the floating piston 4 is tightly contacted with the fixed piston 3, and the second pressure cavity 9 is filled with the inert gas 7.

As shown in fig. 2, the device comprises a rivet 2.1, a shutoff channel 2.2, a throttle groove 2.3 and a shutoff valve plate 2.4. The rivet 2.1 is riveted at the central position of the fixed piston 3, a plurality of shutoff structures are arranged around the fixed piston 3, and each shutoff structure consists of a shutoff channel 2.2, a throttling groove 2.3 and a shutoff valve plate 2.4. The plurality of closure structures are equally and equiradianally arranged around the centre of the rivet 2.1. The shutoff channel 2.2 is arranged between the rivet 2.1 and the pressure cavity shell, the shutoff valve plate 2.4 is arranged at a connecting port of the shutoff channel 2.2 and the first pressure cavity 8, and the throttling groove 2.3 is arranged between the shutoff channel 2.2 and the pressure cavity shell. The throttling groove 2.3 is a tiny slot on the fixed piston 3, and a tiny channel is formed when the shutoff valve plate 2.4 is tightly attached to the tiny slot, so that the throttling effect is achieved. When the shutoff valve plate 2.4 is tightly attached to the tiny grooves, the length of the shutoff valve plate 2.4 just covers the passage openings of the throttling groove 2.3 and the shutoff passage 2.2.

In the process of the running plate of the running machine from the folding to the laying, at the moment, the gas spring is vertical, so that the inert gas 7 in the first pressure cavity 8 is arranged on the upper part, the damping oil 6 is arranged below, the compression ratio of the inert gas 7 is small, the inert gas is compressed preferentially, and the inert gas enters the upper part of the piston 2 through the through hole of the piston 2, when the gas completely enters the upper part of the piston 2, the piston 2 is contacted with the damping oil 6, the elasticity ratio of the damping oil 6 is high, and higher buffering force and the descending speed of the running plate are buffered.

Due to the design of the shut-off structure, when the piston 2 contacts the damping oil 6, the generated high damping force presses the damping oil 6 into the shut-off channel 2.2 very slowly, so that the damping oil 6 in the first pressure cavity 8 is gradually reduced, the reduced damping oil 6 enters the left side of the floating piston 4 of the second pressure cavity 9, the floating piston 4 moves right, and the inert gas 7 on the right side of the floating piston 4 is compressed.

In the process of lifting the front plate of the running machine, the piston rod 1 continues to push inwards, the piston 2 continues to be pressed in, the total amount of damping oil 6 in the first pressure cavity 8 is reduced, the elastic ratio in the first pressure cavity 8 is reduced, the damping force borne by the piston rod 1 is relatively small, the piston 2 passes through the pressure relief groove 5 at the moment, the damping forces on two sides of the piston 2 are quickly balanced, the front plate of the running plate is stably lifted, the influence on the rear plate is small, and the damping force quickly disappears under the cooperation of the pressure relief groove 5.

In the process of descending the running board front plate and retracting the running board of the running machine (namely, in the extending process of the gas spring), the shutoff valve plate 2.4 is not attached to the throttling groove 2.3 and the shutoff channel 2.2 any more due to the change of the left damping force, the shutoff channel 2.2 is opened, damping oil 6 in the second pressure cavity 9 quickly flows back to the first pressure cavity 8 from the shutoff channel 2.2, and the floating piston 4 moves left.

It should be understood that the examples are only for illustrating the present utility model and are not intended to limit the scope of the present utility model. Further, it is understood that various changes and modifications may be made by those skilled in the art after reading the teachings of the present utility model, and such equivalents are intended to fall within the scope of the claims appended hereto.

Claims

1. The utility model provides a treadmill air spring, includes the pressure cylinder body, its characterized in that the pressure cylinder body is provided with a fixed piston, the fixed piston is divided into first pressure chamber and second pressure chamber with the pressure cylinder body, is provided with the closure structure that communicates first pressure chamber and second pressure chamber on the fixed piston, is provided with the floating piston in the second pressure chamber.

2. The treadmill air spring according to claim 1, wherein the shut-off structure comprises a shut-off channel, one end of the shut-off channel is connected with the first pressure chamber, the other end of the shut-off channel is connected with the second pressure chamber, one end of the shut-off channel connected with the first pressure chamber is provided with a shut-off valve plate, and one end of the shut-off channel connected with the first pressure chamber is provided with a groove.

3. The treadmill air spring according to claim 2, wherein the shut-off structure comprises a throttling groove, the throttling groove is arranged at the edge of the fixed piston, one end of the throttling groove is connected with the first pressure cavity, and the other end of the throttling groove is connected with the groove of the shut-off channel.

4. A gas spring for a running machine according to claim 3, wherein the shut-off structure is provided with a valve plate positioning groove, one end of the shut-off valve plate contacts the valve plate positioning groove when the gas spring is in a compressed state, the shut-off valve plate covers the shut-off channel, and the length of the shut-off valve plate is adapted to the throttle groove and the shut-off channel.

5. A gas spring for a running machine according to claim 2, 3 or 4, wherein the center of the fixed piston is riveted with a rivet, and the diameter of the rivet head is adapted to the shutoff valve plate.

6. The treadmill gas spring of claim 1, wherein the second pressure chamber is filled with an inert gas.

7. The treadmill air spring of claim 1, wherein the first pressure chamber is provided with a pressure relief groove on the inner side thereof, the pressure relief groove extending along the axial direction of the first pressure chamber.

8. The treadmill gas spring of claim 1, wherein the floating piston is surrounded by an O-ring.

9. The treadmill air spring of claim 1, wherein the fixed piston is surrounded by an O-ring.

10. A treadmill gas spring as defined in claim 2, 3 or 4, wherein the stationary piston comprises a plurality of shut-off structures disposed in equal arc about the center of the stationary piston.