CN118293178B

CN118293178B - Combined spring damper

Info

Publication number: CN118293178B
Application number: CN202410719900.5A
Authority: CN
Inventors: 邵承玉; 刘文光; 张强; 何文福
Original assignee: SHANGHAI UNIVERSITY; HANGZHOU XINGFA SPRING CO Ltd
Current assignee: SHANGHAI UNIVERSITY; HANGZHOU XINGFA SPRING CO Ltd
Priority date: 2024-06-05
Filing date: 2024-06-05
Publication date: 2024-08-30
Anticipated expiration: 2044-06-05
Also published as: CN118293178A

Abstract

The invention provides a combined spring shock absorber, which comprises two connecting seats arranged in pairs, wherein a shock absorption component is connected between the two connecting seats, the shock absorption component comprises an inner damping cylinder and an outer damping cylinder which are sleeved with each other, an adjusting end cover is rotatably arranged at the bottom of the inner damping cylinder, the damping degree of the shock absorption component is adjusted by rotating the adjusting end cover, and compared with the first piston provided with a first communication hole, the movable element is arranged on the first piston, the movable element is better arranged at the bottom of the damping cylinder, and the rotation of the adjusting end cover is more stable, so that the superposition degree of the first communication hole and the second communication hole can be accurately adjusted. Simultaneously, the damping hole has been seted up on the internal damping jar, and is provided with the third piston on first piston for two sections damping effect have when damper shock attenuation, damper front section damping degree is less promptly, and damper rear section damping degree is great, and the compromise damping is too big or too little advantage and shortcoming.

Description

Combined spring damper

Technical Field

The invention relates to the technical field of spring shock absorbers, in particular to a combined spring shock absorber.

Background

When many machines are in operation, the whole machine vibrates due to vibration of part of the components in operation, so that noise can be generated by the vibration of the machines in operation, and the operation is influenced. The combined spring shock absorber adopts multiple combined springs as a main body, and reduces equipment vibration by using the supporting energy storage of the integrated steel springs and the energy absorption function of the damper and by using a method of consuming mechanical energy.

In the prior art, the damping characteristic of the damper in the combined spring damper is always a fixed value, and cannot be adjusted according to the change of the production environment, so that the combined spring damper is poor in adaptability, and the sectional area of a damping hole on a piston is usually changed, so that a movable element is arranged on the piston, a control mechanism is arranged at the tail end of a piston rod, the control stroke is long, and the stability is poor.

Disclosure of Invention

Based on the above, it is necessary to provide a combined spring damper for solving the problems of poor adaptability and poor stability of the existing spring damper.

The above purpose is achieved by the following technical scheme:

a combination spring shock absorber, comprising:

The connecting seats are arranged in pairs, a limiting assembly is arranged between the two connecting seats, and the limiting assembly is used for limiting and guiding the two connecting seats to move in a direction away from or close to each other;

The damping assembly is connected with two connecting seats and comprises an inner damping cylinder, an outer damping cylinder and a first spring, wherein the inner damping cylinder and the outer damping cylinder are sleeved with each other, the first spring is sleeved on the periphery of the outer damping cylinder, a first piston is arranged in the inner damping cylinder and is connected with one of the two connecting seats through a piston rod, the outer damping cylinder is connected with the other one of the two connecting seats, a second piston is arranged between the inner damping cylinder and the outer damping cylinder, and damping liquid is filled below the first piston and the second piston;

the damping device is characterized in that an adjusting end cover is rotatably arranged at the bottom of the inner damping cylinder, a first communication hole is formed in the side wall, close to the lower end, of the inner damping cylinder, the adjusting end cover rotates to adjust the flow speed of damping fluid passing through the first communication hole, and the damping degree of the damping component is inversely related to the flow speed of the damping fluid passing through the first communication hole.

Further, an annular sleeve is fixedly arranged on the upper end face of the adjusting end cover, the annular sleeve is sleeved at the lower end of the inner damping cylinder, and a second communication hole is formed in the side wall of the annular sleeve;

The annular sleeve and the inner damping cylinder rotate relatively to adjust the superposition degree of the first communication hole and the second communication hole, and the damping liquid flowing speed between the inner damping cylinder and the outer damping cylinder is positively correlated with the superposition degree of the first communication hole and the second communication hole.

Further, a third piston is arranged in the inner damping cylinder, the third piston is located above the first piston and sleeved on the piston rod, damping liquid is filled between the first piston and the third piston, fine holes are formed in the first piston, the fine holes are communicated with the space below the first piston and the space between the first piston and the third piston, damping holes are formed in the side wall of the inner damping cylinder, the damping holes are communicated with the inner damping cylinder and the outer damping cylinder, and after the first piston passes through the damping holes, the damping holes are communicated with the space between the inner damping cylinder and the outer damping cylinder and the space between the first piston and the third piston.

Further, an adjusting nut is fixedly connected to the lower end face of the adjusting end cover, and the adjusting nut rotates to drive the adjusting end cover to rotate.

Further, a dust cover is arranged at the joint of the piston rod and the connecting seat, and the upper end of the outer damping cylinder is covered by the dust cover.

Further, the spacing subassembly includes guide post and gag lever post, the both ends of guide post are perpendicular to two connecting seats and fixed connection respectively, the guide post can be along self axis flexible so that two connecting seats remove on same straight line, the fixed setting in one of two connecting seats of one end of gag lever post, the other end of connecting rod then slides and sets up another in two connecting seats, and the surface of slip direction perpendicular to two connecting seats, the cover is equipped with the second spring on the periphery of gag lever post, the both ends of second spring butt two connecting seats respectively.

Further, the connecting holes are formed in the two connecting seats, the baffle is fixedly arranged at one end of the limiting rod, threads are arranged at the other end of the limiting rod, the limiting rod passes through the connecting holes and then is fixed through nuts, and the two connecting seats are supported by the second springs on the periphery of the limiting rod so as to limit the two connecting seats.

Further, the limit rods are four, the four limit rods are respectively located at four corners of the two connecting seats, one guide column is arranged, and the guide column is located at the middle position of the two connecting seats.

Further, the shock absorbing assembly has a plurality of uniform and arranged between the two connecting seats.

Further, bolt holes are formed in the two connecting seats.

The beneficial effects of the invention are as follows:

According to the damping device, the inner damping cylinder and the outer damping cylinder are arranged, the adjusting end cover is rotatably arranged at the bottom of the inner damping cylinder, and the damping degree of the damping component is adjusted by rotating the adjusting end cover. Simultaneously, the damping hole has been seted up on the internal damping jar, and is provided with the third piston on first piston for two sections damping effect have when damper shock attenuation, damper front section damping degree is less promptly, and damper rear section damping degree is great, and the compromise damping is too big or too little advantage and shortcoming.

Through setting up inside and outside damping jar for the damping liquid of sealing interface is difficult to leak, and the sealed effect is better.

Through setting up inside and outside damping jar for inside damping liquid can even intensification, further maintains the good damping effect of damper.

Drawings

FIG. 1 is a schematic diagram of a combined spring shock absorber according to an embodiment of the present invention;

FIG. 2 is a front view of the combined spring and shock absorber provided by the embodiment of FIG. 1;

FIG. 3 is a top view of the combined spring and shock absorber provided by the embodiment of FIG. 1;

FIG. 4 is a cross-sectional view of the combined spring and shock absorber provided in one embodiment of FIG. 3 taken along line A-A;

FIG. 5 is an enlarged partial view of a portion C of the combined spring and shock absorber provided in one embodiment of FIG. 4;

FIG. 6 is a cross-sectional view of the combined spring and damper provided in one embodiment of FIG. 3, taken along line B-B.

Wherein:

100. A connecting seat; 110. bolt holes; 120. a connection hole;

200. an outer damping cylinder; 210. an inner damping cylinder; 211. a first communication hole; 212. a damping hole; 220. a first piston; 221. a piston rod; 222. fine pores; 230. a second piston; 240. a third piston; 250. a first spring; 260. a dust cover;

300. Adjusting the end cover; 310. an annular sleeve; 311. a second communication hole; 320. an adjusting nut;

400. a guide post; 410. a limit rod; 411. a baffle; 412. a thread; 420. and a second spring.

Detailed Description

The present invention will be further described in detail below with reference to examples, which are provided to illustrate the objects, technical solutions and advantages of the present invention. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

The numbering of components herein, such as "first," "second," etc., is used merely to distinguish between the described objects and does not have any sequential or technical meaning. The term "coupled" as used herein includes both direct and indirect coupling (coupling), unless otherwise indicated. In the description of the present application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element in question must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

A combined spring damper according to the present application is described below with reference to fig. 1 to 6.

A combined spring damper is used for reducing vibration of equipment and improving running stability of the equipment, and comprises two connecting seats 100 which are arranged in pairs, wherein the two connecting seats 100 are used for being connected in areas where the equipment needs to be damped, a limiting component is arranged between the two connecting seats 100 and used for connecting the two connecting seats 100, the two connecting seats 100 are enabled to move along directions which are close to or far away from each other, and meanwhile the two connecting seats 100 are prevented from being far away from each other, namely, the two connecting seats 100 are limited and guided. And a damping component is further arranged between the two connecting seats 100 and used for slowing down the speed of the two connecting seats 100 approaching or separating from each other, so that the vibration and impact of mechanical equipment are absorbed.

The damping assembly comprises an inner damping cylinder 210 and an outer damping cylinder 200 which are mutually sleeved, a first piston 220 is arranged in the inner damping cylinder 210, a piston rod 221 is fixedly connected to one end of the first piston 220, the other end of the piston rod 221 is connected with one of the two connecting seats 100, specifically the upper connecting seat 100, the bottom of the outer damping cylinder 200 is connected with the other of the two connecting seats 100, specifically the lower connecting seat 100, a second piston 230 is arranged in a space between the inner damping cylinder 210 and the outer damping cylinder 200, and damping liquid is filled below the second piston 230 and the first piston 220. The side wall of the inner damping cylinder 210 near the lower end is provided with a first communication hole 211, the first communication hole 211 communicates the space below the first piston 220 with the space below the second piston 230, so that damping fluid in the spaces below the first piston 220 and the second piston 230 can flow, because the size of the first communication hole 211 is much smaller than that of the whole inner damping cylinder 210, when the two connecting seats 100 are mutually close to each other under the action of acting force, the first piston 220 is forced to move downwards, so that the damping fluid passes through the first communication hole 211, the speed of the damping fluid flowing from the space below the first piston 220 to the space below the second piston 230 is slow, the downward movement of the first piston 220 can be slowed down, the damping effect is also realized, the outer periphery of the outer damping cylinder 200 is sleeved with a first spring 250, the first spring 250 is compressed to absorb the energy of vibration and impact, and similarly, when the two connecting seats 100 are mutually far away from each other and reset, the speed is also slow.

It can be understood that the flow rate of the damping fluid can be changed by changing the size of the first communication hole 211, so that the degree of damping can be adjusted. That is, the faster the flow speed of the damping fluid through the first communication hole 211, the lower the damping degree of the damper assembly; the slower the flow rate of the damping fluid through the first communication hole 211, the higher the damping degree of the damper assembly.

The application is provided with the adjusting end cover 300 at the bottom end of the inner damping cylinder 210, and the adjusting end cover 300 rotates to change the speed of the damping fluid passing through the first communication hole 211, thereby adjusting the descending speed of the first piston 220, and adjusting the damping degree.

Meanwhile, the inner damping cylinder 210 and the outer damping cylinder 200 which are sleeved with each other have other beneficial effects:

The method comprises the following steps: the inner damping cylinder 210 and the outer damping cylinder 200 are sleeved with each other, so that the damping fluid inside is not easy to leak.

It should be noted that, a sealing ring is disposed at the rotation connection position of the adjusting end cover 300, when the damping assembly does not work, the damping fluid below the second piston 230 is not pressurized, and the pressure of the damping fluid on the sealing ring is smaller, so that the damping fluid inside is not easy to leak.

And two,: through the mutually sleeved inner damping cylinder 210 and outer damping cylinder 200, the temperature of the damping fluid in the damping fluid can be uniformly increased during operation, and particularly compared with the traditional single damping cylinder, under the condition that the vibration amplitude of the damping fluid is the same as that of the traditional single damping cylinder, the structure of the damping fluid heat exchanger can enable more damping fluid to exchange heat under the movement of a piston (the damping component absorbs mechanical energy and converts the mechanical energy into the internal energy of the damping fluid during operation, so that the temperature of the damping fluid is increased, but the viscosity of the damping fluid is reduced when the temperature of the damping fluid is increased, so that the damping effect of the damping fluid is weakened, and if the temperature of the damping fluid is uneven, the damping effect of the damping fluid is poorer, so that the temperature of the damping fluid is uniformly increased, and the good damping effect of the damping component is further maintained.

Specifically, the upper end of the adjusting end cover 300 is fixedly provided with an annular sleeve 310, the side wall of the annular sleeve 310 is provided with a second communication hole 311, the annular sleeve 310 is sleeved at the bottom end of the inner damping cylinder 210, the height of the second communication hole 311 on the annular sleeve 310 in the vertical direction is the same as that of the first communication hole 211, so that when the adjusting end cover 300 rotates to drive the annular sleeve 310 to rotate, the second communication hole 311 on the annular sleeve 310 can be overlapped with the first communication hole 211 on the side wall of the inner damping cylinder 210, the overlapping degree is larger, namely the speed of damping fluid passing through the first communication hole 211 and the second communication hole 311 is faster, the overlapping degree is smaller, and the opening allowing damping fluid to pass through by the first communication hole 211 and the second communication hole 311 is smaller, namely the flowing speed of the damping fluid is slower.

It should be noted that, the damping of the shock absorber on the mechanical device is not larger or smaller, but an appropriate damping value needs to be determined according to a specific application scenario and requirements, for example, when the damping is larger, the vibration amplitude of the mechanical device can be effectively reduced by the shock absorbing component, and the shock can be rapidly attenuated; when the damping is small, the amplitude is too large, the vibration cannot be effectively restrained, and the vibration attenuation is slow. Therefore, the degree of superposition of the first communication hole 211 and the second communication hole 311 can be changed by adjusting the adjusting end cover 300, so that the degree of damping is adjusted, and the proper damping can effectively restrain vibration and simultaneously maintain the sensitivity and response speed of the mechanical equipment, thereby effectively prolonging the service life of the equipment.

According to the application, the first communication hole 211 is formed in the side wall of the inner damping cylinder 210 close to the lower end, and the adjusting end cover 300 is rotatably arranged at the bottom of the inner damping cylinder 210, compared with the first communication hole 211 formed in the first piston 220, the movable element is arranged on the first piston 220, and the movable element is better arranged at the bottom of the damping cylinder, that is to say, the adjusting end cover 300 is rotatably arranged at the bottom of the inner damping cylinder 210, and the rotation of the adjusting end cover 300 is more stable, so that the superposition degree of the first communication hole 211 and the second communication hole 311 can be accurately adjusted.

Specifically, in order to facilitate the adjustment of the operator, an adjusting nut 320 is fixedly connected to the bottom end of the adjusting end cover 300, and the operator can adjust the adjusting end cover 300 by using a wrench.

In a further embodiment, a third piston 240 is further disposed in the inner damping cylinder 210, the third piston 240 is located above the first piston 220 and sleeved on the piston rod 221, damping liquid is filled between the third piston 240 and the first piston 220, a cavity is not filled with damping liquid above the third piston 240, and gas (compressed air or nitrogen) is filled in the cavity. A damping hole 212 is formed in the side wall of the inner damping cylinder 210, the position of the damping hole 212 is higher than that of the first communication hole 211, and the damping hole 212 communicates a space below the first piston 220 with a space below the second piston 230.

When the vibration amplitude of the mechanical device is small, the first piston 220 moves downward without passing through the damping hole 212, the two connection seats 100 approach each other, the piston rod 221 drives the first piston 220 to move downward, and the third piston 240 also moves downward due to the damping liquid filled between the first piston 220 and the third piston 240. The damping fluid under the pushing of the first piston 220 passes through the damping hole 212, the first communication hole 211 and the second communication hole and then enters into the space under the second piston 230, the damping fluid in the space increases to push the second piston 230 to press the cavity above, and the first spring 250 at the periphery of the outer damping cylinder 200 provides a restoring force during restoring, so that the first piston 220 moves upwards and the second piston 230 moves downwards.

When the amplitude of the mechanical device is large, the first piston 220 will cross the damping hole 212, and when the first piston 220 does not cross the damping hole 212, the first piston 220, the second piston 230 and the third piston 240 are consistent with the above process, and will not be described again. When the first piston 220 passes over the damping hole 212, the damping fluid under the first piston 220 can only enter under the second piston 230 through the first communication hole 211 and the second communication hole 311, while the third piston 240 does not pass over the damping hole 212, the damping hole 212 communicates the space under the second piston 230 with the space between the first piston 220 and the third piston 240, the damping fluid entering the space under the second piston 230 enters between the first piston 220 and the third piston 240 through the damping hole 212 (since the space above the third piston 240 is in a negative pressure state, the damping fluid under the second piston 230 enters into the space between the third piston 240 and the first piston 220), and the degree of damping increases.

When the first piston 220 does not pass through the damping hole 212, the original damping fluid passes through the first communication hole 211, the second communication hole 311 and the damping hole 212 at the same time, the damping degree is low, and the damping fluid passing through the damping hole 212 passes through the first communication hole 211 and then through the damping hole 212, so that the damping degree is increased. That is to say, the damping is variable, when the damping hole 212 is not crossed, the damping is smaller, and when the damping hole 212 is crossed, the damping is larger, through the arrangement of the structure, the front half section of the vibration of the mechanical equipment has higher sensitivity and dynamic response speed, and the rear half section can effectively restrain the vibration and impact.

It can be appreciated that, during the resetting, the first spring 250 provides a restoring force, the first piston 220 moves upward to drive the third piston 240 to move upward, and when the first piston 220 does not pass through the damping hole 212, the damping fluid between the first piston 220 and the third piston 240 changes slightly (because the cavity above the third piston 240 is in a negative pressure state, the third piston 240 has a tendency to move upward, and when the first piston 220 moves upward, the third piston 240 also moves upward, and the moving speeds of the two are close, so that the damping fluid is easier to pass through the first communication hole 211 and the second communication hole 311, and therefore, most of the damping fluid below the second piston 230 enters from the first communication hole 211 and the second communication hole 311 to the lower side of the first piston 220, and the damping fluid passing through the damping hole 212 is very little, which is negligible).

The first piston 220 is provided with the fine holes 222, the size of the fine holes 222 is far smaller than the size of the damping holes 212 and the first communication holes 211, the fine holes 222 are used for communicating the space between the first piston 220 and the third piston 240 with the space below the first piston 220, after the first piston 220 passes over the damping holes 212, compared with the space between the first piston 220 and the third piston 240 in the initial state, the amount of damping liquid between the first piston 220 and the third piston 240 is more (because part of damping liquid enters between the first piston 220 and the third piston 240 after the first piston 220 moves down over the damping holes 212, and when the first piston 220 moves up and returns to the reset state, the amount of damping liquid between the first piston 220 and the third piston 240 is more than the amount of damping liquid between the first piston 220 and the third piston 240 in the initial state, namely, if the subsequent vibration and impact amplitude are reduced, the fine holes 222 on the first piston 220 gradually enable the damping liquid in the first piston 220 and the third piston 240 to recover normally; if the subsequent amplitude and impact are still large, the first piston 220 can still cross the damping hole 212, the damping degree will become large after the first piston 220 and the third piston 240 gradually increase each time the first piston passes through the damping hole 212, and the distance between the first piston 220 and the third piston 240 is gradually shortened, so that the first piston 220 can cross the damping hole 212 in a shorter time to increase the damping degree, that is, when the subsequent amplitude and impact are larger, the distance between the first piston 220 and the damping hole 212 is smaller and smaller, and the speed of increasing the damping degree is faster and faster, thereby effectively suppressing the subsequent vibration and impact with large amplitude.

In a further embodiment, a dust cover 260 is provided at the connection of the piston rod 221 and the connection base 100, and the dust cover 260 shields the upper end of the outer damping cylinder 200, thereby playing a dust-proof role.

Specifically, the limiting component in this embodiment includes a guide post 400 and a limiting rod 410, two ends of the guide post 400 hang on the surfaces connecting the two connecting seats 100 and are fixedly connected with the two connecting seats 100, the guide post 400 can stretch along the axial direction, so that the two connecting seats 100 can move on the same straight line, one end of the limiting rod 410 is fixedly connected with one of the two connecting seats 100, the other end of the limiting rod 410 is slidably connected with the other one of the two connecting seats 100, the sliding direction is perpendicular to the surfaces of the two connecting seats 100, a second spring 420 is sleeved on the periphery of the limiting rod 410, and two ends of the second spring are abutted against the two connecting seats 100.

The two connecting seats 100 are provided with connecting holes 120, one end of a limiting rod 410 is fixedly provided with a baffle 411, the other end of the limiting rod 410 is provided with threads 412, one end of the limiting rod 410 with the threads 412 penetrates through the connecting holes 120 and then is sleeved with a second spring 420, and the other end of the limiting rod 410 with the threads 412 penetrates through the other connecting hole 120 and then is provided with a nut, so that the limiting rod 410 limits the two connecting seats 100.

Specifically, in this embodiment, the number of the limit rods 410 is four, but the number of the guide posts 400 is only one, the four limit rods 410 are respectively located at the four corners of the two connection seats 100, and the guide posts 400 are located at the middle positions of the two connection seats 100, so that the two connection seats 100 are more stably guided and limited.

It should be noted that the four shock absorbing assemblies of the present application are also located between the two stop rods 410, so that the shock absorption of the two connection seats 100 is more stable.

In a further embodiment, a plurality of bolt holes 110 are formed in each of the two connection seats 100, the two connection seats 100 are fixed in the area where the equipment needs to be damped through the bolt holes 110, and the two connection seats are convenient to install and detach through bolt connection, so that the two connection seats are convenient and quick to use.

The specific working process of the combined spring damper provided by the application is described by combining the above embodiments:

And (2) mounting:

The two connection seats 100 are fixed to the areas of the apparatus where shock absorption is required by bolting.

Work:

the position of the end cover 300 is adjusted according to the working requirement of the device to adjust the superposition degree of the first communication hole 211 and the second communication hole 311, and then the damping degree of the damping component is adjusted to adapt to the working of the device.

When vibration or impact occurs in the device, if the amplitude is small, the two connection seats 100 move closer to each other, and the distance between them is short, and the first piston 220 does not pass through the damping hole 212, so that the damping fluid under the first piston 220 can pass through the first communication hole 211, the second communication hole 311 and the damping hole 212 at the same time. During resetting, the first spring 250 and the second spring 420 provide a resetting acting force, damping liquid enters into the space below the first piston 220 from the lower part of the second piston 230 through the first communication hole 211, the second communication hole 311 and the damping hole 212 at the same time, so that the damping degree is small, and the service life of the device can be prolonged;

when the amplitude or impact is large, the distance between the two connection seats 100 moving closer to each other is long, the first piston 220 will cross the damping hole 212, the damping degree of the damping assembly is small before the first piston 220 crosses the damping hole 212, after crossing the damping hole 212, the damping degree of the damping assembly is increased, the damping liquid below the first piston 220 can only enter the space below the second piston 230 through the first communication hole 211 and the second communication hole 311, and because the cavity above the third piston 240 is in a negative pressure state, a part of the damping liquid entering the space below the second piston 230 enters the space between the third piston 240 and the first piston 220 through the damping hole 212, namely, the damping liquid below the first piston 220 passes through the first communication hole 211 and then passes through the damping hole 212, so that the amplitude or impact is reduced. Therefore, the damping component has the function of variable damping on the premise of finishing damping adjustment.

When the first piston 220 moves upward during the return, the third piston 240 also moves upward, the damping fluid between the first piston 220 and the second piston 230 is almost unchanged, but compared with the damping fluid in the initial state, the damping fluid between the first piston 220 and the second piston 230 increases during the return, so that the distance between the first piston 220 and the second piston 230 increases, the damping degree of the return after passing through the damping hole 212 is larger, and the damping degree of the return after not passing through the damping hole 212 is reduced again, so that the front-stage damping degree of the damping assembly is smaller, the damping degree of the rear-stage damping of the damping assembly is larger, and the advantages and disadvantages of the excessive or insufficient trade-off are overcome.

If the amplitude and the impact are still larger after the reset, the damping fluid between the first piston 220 and the second piston 230 increases each time the first piston 220 passes over the damping hole 212, so that the distance between the first piston 220 and the second piston 230 increases, that is, the first piston 220 is closer to the damping hole 212, so that the time required for increasing the damping degree is shorter and shorter, and the vibration can be effectively restrained in a short time.

If the amplitude and the impact decrease after the return, the excessive damping fluid between the first piston 220 and the second piston 230 gradually enters the lower portion of the first piston 220 through the fine holes 222, and gradually returns to the initial state.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples merely represent a few embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the present invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of the invention should be assessed as that of the appended claims.

Claims

1. A combination spring shock absorber, comprising:

The damping device comprises an inner damping cylinder, a damping assembly, an adjusting end cover, an annular sleeve, a damping assembly and a second communication hole, wherein the bottom of the inner damping cylinder is rotatably provided with the adjusting end cover, a first communication hole is formed in the side wall, close to the lower end, of the inner damping cylinder, the adjusting end cover rotates to adjust the flow speed of damping liquid passing through the first communication hole, the damping degree of the damping assembly is inversely related to the flow speed of the damping liquid passing through the first communication hole, the upper end surface of the adjusting end cover is fixedly provided with the annular sleeve, the annular sleeve is sleeved at the lower end of the inner damping cylinder, and the side wall of the annular sleeve is provided with the second communication hole;

The annular sleeve and the inner damping cylinder rotate relatively to adjust the superposition degree of the first communication hole and the second communication hole, the damping liquid flowing speed between the inner damping cylinder and the outer damping cylinder is positively correlated with the superposition degree of the first communication hole and the second communication hole,

The inner damping cylinder is internally provided with a third piston, the third piston is positioned above the first piston and sleeved on the piston rod, damping liquid is filled between the first piston and the third piston, fine holes are formed in the first piston, the fine holes are communicated with the space below the first piston and the space between the first piston and the third piston, damping holes are formed in the side wall of the inner damping cylinder, the damping holes are communicated with the inner damping cylinder and the outer damping cylinder, and after the first piston passes through the damping holes downwards, the damping holes are communicated with the space between the inner damping cylinder and the outer damping cylinder and the space between the first piston and the third piston.

2. The combination spring shock absorber of claim 1, wherein an adjustment nut is fixedly connected to the lower end surface of the adjustment end cap, and wherein rotation of the adjustment nut rotates the adjustment end cap.

3. The combination spring shock absorber of claim 1, wherein a dust cover is provided at a junction of the piston rod and the connection base, the dust cover covering an upper end of the outer damping cylinder.

4. The combined spring shock absorber according to claim 1, wherein the limiting component comprises a guide post and a limiting rod, two ends of the guide post are respectively perpendicular to the two connecting seats and fixedly connected, the guide post can stretch along the axis of the guide post to enable the two connecting seats to move on the same straight line, one end of the limiting rod is fixedly arranged on one of the two connecting seats, the other end of the limiting rod is slidably arranged on the other one of the two connecting seats, the sliding direction is perpendicular to the surfaces of the two connecting seats, a second spring is sleeved on the periphery of the limiting rod, and two ends of the second spring are respectively abutted against the two connecting seats.

5. The combined spring damper according to claim 4, wherein the two connecting seats are provided with connecting holes, a baffle is fixedly arranged at one end of the limiting rod, threads are arranged at the other end of the limiting rod, the limiting rod is fixed through nuts after passing through the connecting holes, and the two connecting seats are supported by the second springs on the periphery of the limiting rod so as to limit the two connecting seats.

6. The combination spring shock absorber of claim 4, wherein the number of the limit rods is four, the four limit rods are respectively positioned at four corners of the two connecting seats, the number of the guide posts is one, and the guide posts are positioned at the middle positions of the two connecting seats.

7. The combination spring shock absorber of claim 1 wherein said shock absorbing assembly has a plurality of uniform and spaced between two connection blocks.

8. The combination spring shock absorber of claim 1, wherein the two connecting seats are each formed with a bolt hole.