Low-cost passive air damper

Abstract

The utility model discloses a low-cost passive air shock absorber, which relates to the technical field of shock absorbers, and comprises a fixed cylinder and a telescopic cylinder nested in the fixed cylinder, the outer side end faces of the fixed cylinder and the telescopic cylinder are respectively an upper end cover and a lower end cover; a damping spring is arranged on the inner wall of the lower end cover, an inner sliding rod perpendicular to the inner wall of the upper end cover is arranged in the middle of the inner wall of the upper end cover, and the inner sliding rod is sleeved with the telescopic cylinder in a sliding mode. The inner sliding rod is of a sectional structure and comprises a rod body and a fixing plate, and the rod body is connected between the inner wall of the upper end cover and the end face of the inner side of the fixing plate. The fixing plate is clamped in the telescopic cylinder, and the outer side end face of the fixing plate is connected with the damping spring. And a recoil spring is connected between the inner side end surface of the positioning plate and the inner wall of the end part of the telescopic cylinder. According to the air shock absorber, the recoil spring is arranged in the air shock absorber to achieve the anti-collision effect, and therefore the anti-collision effect of the telescopic cylinder and the fixed cylinder on the air shock absorber can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of shock absorbers, in particular to a low-cost passive air shock absorber. Background Art

[0002] Air shock absorber is a shock absorber that uses compressed air to reduce vibration. It has the advantages of low noise and long service life. It is a widely used shock absorber. Since air shock absorber uses compressed air to reduce vibration and buffer when working, there is no need to fill oil and there is no risk of oil leakage.

[0003] The air shock absorbers in the prior art generally lack a good structural design to prevent rebound when using springs to provide shock absorption for mechanical equipment. As a result, during a large-scale shock absorption process, the shock absorbing spring causes the telescopic tube and the fixed tube to be installed against each other when extended, thereby causing the structural connection of the air shock absorber itself to become unstable. Utility Model Content

[0004] The utility model provides a low-cost passive air shock absorber to solve the problem that when the air shock absorber is elastically extended, the impact force between the telescopic cylinder and the fixed cylinder is too large.

[0005] The utility model is realized by the following technical solutions:

[0006] A low-cost passive air shock absorber comprises a fixed cylinder and a telescopic cylinder nested in the fixed cylinder, the outer end faces of the fixed cylinder and the telescopic cylinder are respectively an upper end cover and a lower end cover; a shock-absorbing spring is provided on the inner wall of the lower end cover, an inner sliding rod perpendicular to the inner wall of the upper end cover is centrally provided on the inner wall of the upper end cover, and the telescopic cylinder is slidably mounted on the inner sliding rod; the inner sliding rod is a segmented structure, comprising a rod body and a fixed plate, the rod body is connected between the inner wall of the upper end cover and the inner end face of the fixed plate; the fixed plate is clamped in the telescopic cylinder, and the outer end face of the fixed plate is connected to the shock-absorbing spring; a recoil spring is connected between the inner end face of the positioning plate and the inner wall of the end of the telescopic cylinder.

[0007] Specifically, the telescopic cylinder is nested in the fixed cylinder, that is, one end of the fixed cylinder is sealed by the upper end cover, and the other end is open for the telescopic cylinder to move. The exposed end of the telescopic cylinder is sealed by the lower end cover, and the other end is located inside the fixed cylinder, and the chamber between the other end and the upper end cover forms an air cavity. One end of the inner slide bar is fixed on the inner wall of the upper end cover, and the other end is clamped in the end of the telescopic cylinder located in the fixed cylinder, that is, the end of the telescopic cylinder located in the fixed cylinder retains a part of the end surface structure, and the telescopic cylinder can be telescopically slid when it is sleeved on the inner slide bar. The inner slide bar includes a rod body and a fixed plate, and the rod body is connected between the inner end surface of the fixed plate and the inner wall of the upper end cover. The inner slide bar is T-shaped when viewed from the side section. One end of the shock-absorbing spring is connected to the inner wall of the lower end cover, and the other end is connected to the outer end surface of the fixed plate. The shock-absorbing spring provides a basic elastic shock-absorbing effect for the shock absorber. One end of the recoil spring is arranged on the inner end surface of the fixed plate, and the other end is connected to the inner wall of the end of the telescopic tube located in the fixed tube on the telescopic tube. The recoil spring is used when the shock absorbing spring is compressed after being bumped, and then the contraction elastic force is relieved, the length of the shock absorbing spring is extended, and the telescopic tube is driven to extend outward from the fixed tube. At this time, the end of the telescopic tube located inside the fixed tube will quickly approach the fixed plate at the end of the inner slide rod. At this time, the recoil spring can be compressed to slow down the extension rate of the telescopic tube, which can significantly reduce the kinetic energy generated when the telescopic tube is extended, so that when the air shock absorber is elastically extended, the problem of excessive impact force between the telescopic tube and the fixed tube is avoided.

[0008] Furthermore, it also includes a plurality of stop springs arranged on the inner wall of the upper end cover, and the plurality of stop springs are evenly distributed around the inner slide rod. When the pressure from the outside is greater than the pressure of the shock absorbing spring plus the compressed air, the elastic support of the stop spring can be used to prevent the end surface of the telescopic cylinder located in the fixed cylinder from colliding with the inner wall of the upper end cover, thereby reducing the risk of the upper end cover of the fixed cylinder being damaged due to collision.

[0009] Furthermore, it also includes a sealing rubber ring, which includes an outer tube rubber ring, a rod body rubber ring and a fixed plate rubber ring; the outer tube rubber ring is arranged on the outer wall of the telescopic tube and fits with the inner wall of the fixed tube; the rod body rubber ring is arranged inside the telescopic tube and fits with the outer wall of the rod body; the fixed plate rubber ring is arranged on the side wall of the fixed plate and fits with the inner wall of the telescopic tube. The sealing rubber ring is arranged between each pair of relatively sliding parts. When the air shock absorber is subjected to shock and bump, the shock absorbing spring drives the telescopic tube to telescope and slide in the fixed tube through elastic compression and elastic extension. At this time, the outer wall of the telescopic tube and the inner wall of the fixed tube, the inner side wall of one end of the telescopic tube located inside the fixed tube and the outer wall of the rod, and the side wall of the fixed plate and the inner wall of the telescopic tube all slide relative to each other. By arranging the sealing rubber ring, when the air shock absorber is working, after the air cavity is continuously pressurized, the slow leakage effect of the sealing rubber ring can be used to slow down the telescopic speed and amplitude of the telescopic tube in the fixed tube, so as to achieve the effect of damping and shock reduction.

[0010] Furthermore, it also includes a plurality of brass slide cylinders, which are divided into two groups. The two groups of brass slide cylinders are respectively arranged on the inner walls at both ends of the fixed cylinder. The brass slide cylinder is arranged on the inner wall of the fixed cylinder and is located between the inner wall of the fixed cylinder and the outer wall of the telescopic cylinder when in use. The smoothness of the brass slide cylinder is used to prevent abnormal wear of the fixed cylinder and the telescopic cylinder.

[0011] Furthermore, a mounting ear with a screw hole is provided on the outer side wall of the fixing tube. The mounting ear is used to fix the entire air shock absorber. The use of the mounting ear can increase the installation and use scenarios of the air shock absorber to adapt to more fields of use.

[0012] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0013] 1. An inner slide bar is arranged in the fixed tube, and a shock absorbing spring and a recoil spring are arranged on the outer and inner end surfaces of the inner slide bar respectively, which play the role of shock absorption and anti-collision respectively, so as to realize the anti-collision effect of the telescopic tube and the fixed tube on the air shock absorber;

[0014] 2. A sealing rubber ring is arranged between each pair of relatively sliding parts to achieve the function of damping and shock absorption;

[0015] 3. A stop spring is arranged on the inner wall of the upper end cover to prevent the end of the telescopic cylinder from directly colliding with the upper end cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the embodiments of the present utility model, constitute a part of this application, and do not constitute a limitation of the embodiments of the present utility model. In the drawings:

[0017] Figure 1 This is a schematic diagram of the structure of the telescopic cylinder of the utility model after extension;

[0018] Figure 2 This is a schematic diagram of the structure of the telescopic tube of the utility model after it is retracted;

[0019] Figure 3 for Figure 1 The structural diagram of the enlarged part A in the middle;

[0020] Figure 4 This is a schematic diagram of the structure of the inner slide bar in the utility model;

[0021] Marks and corresponding parts names in the attached drawings:

[0022] 1-fixed cylinder, 11-upper end cover, 2-telescopic cylinder, 21-lower end cover, 3-inner slide rod, 31-fixed plate, 32-rod body, 33-fixing screw, 4-shock-absorbing spring, 41-stop spring, 42-recoil spring, 5-outer cylinder rubber ring, 51-rod body rubber ring, 52-fixed plate rubber ring, 6-brass slide cylinder, 7-mounting ear. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the utility model more clearly understood, the utility model is further described in detail below in conjunction with embodiments and drawings. The schematic implementation manner of the utility model and its description are only used to explain the utility model and are not intended to limit the utility model. Example

[0024] like Figure 1-Figure 4 As shown, the utility model is a low-cost passive air shock absorber, comprising a fixed cylinder 1 and a telescopic cylinder 2 nested in the fixed cylinder 1, the outer end faces of the fixed cylinder 1 and the telescopic cylinder 2 are respectively an upper end cover 11 and a lower end cover 21; a shock-absorbing spring 4 is provided on the inner wall of the lower end cover 21, the inner sliding rod 3 is centrally arranged on the inner wall of the upper end cover 11, and is fixed to the inner wall of the upper end cover 11 by a fixing screw 33, and the telescopic cylinder 2 is slidably sleeved on the inner sliding rod 3; the inner sliding rod 3 is a segmented structure, comprising a rod body 32 and a fixing plate 31, the rod body 32 is connected between the inner wall of the upper end cover 11 and the inner end face of the fixing plate 31; the fixing plate 31 is clamped in the telescopic cylinder 2, and the outer end face of the fixing plate 31 is connected to the shock-absorbing spring 4; a recoil spring 42 is connected between the inner end face of the fixing plate 31 and the inner wall of the end of the telescopic cylinder 2.

[0025] When in use, the telescopic cylinder 2 is located in a chamber between one end of the interior of the fixed cylinder 1 and the inner wall of the upper end cover 11 to form an air cavity. The telescopic cylinder 2 is sleeved on the inner slide bar 3 and can be telescopically slid. The rod body 32 is connected between the inner end surface of the fixed plate 31 and the inner wall of the upper end cover 11. From a side view, the inner slide bar is T-shaped. After the air shock absorber is bumped, the shock absorbing spring 4 is compressed, and the telescopic cylinder 2 is retracted into the fixed cylinder 1. At this time, the recoil spring 42 is stretched. When the air shock absorber then unloads the elastic force of the contracted shock absorber spring 4, the length of the shock absorber spring 4 is extended, driving the telescopic tube 2 to extend outward from the fixed tube 1. At this time, the end of the telescopic tube 2 located inside the fixed tube 1 will quickly approach the fixed plate 31 at the end of the inner slide rod 3. At this time, after the recoil spring 42 is contracted by elastic force, the recoil spring 42 has a thrust effect on the end of the telescopic tube 2 located inside the fixed tube 1, which has the effect of slowing down the continued extension of the telescopic tube 2, and can significantly reduce the kinetic energy generated when the telescopic tube 2 is extended, so that when the air shock absorber is elastically extended, the problem of excessive impact force between the telescopic tube 2 and the fixed tube 1 is avoided. The shock absorber spring 4 and the recoil spring 42 push and pull the telescopic tube 2 in two opposite directions, so that the air shock absorber can be kept in a state of dynamic balance force, thereby improving the stability of the air shock absorber.

[0026] It should be noted that since the shock absorbing spring 4 plays the main role of shock absorbing and buffering, and the recoil spring 42 plays the role of auxiliary protection, in order to ensure the normal use of the air shock absorber, in specific applications, the elastic effect of the shock absorbing spring 4 needs to be greater than that of the recoil spring 42. In order to make the force more balanced, as a feasible implementation method, in specific implementation, preferably, the rod body 32 can be connected to the center position of the inner end surface of the fixing plate 31, and the recoil spring 42 is arranged on the inner end surface of the fixing plate 31 in the form of surrounding the rod body 32.

[0027] In the above embodiment, when the external pressure is greater than the pressure of the shock absorbing spring 4 plus the compressed air, the end surface of the telescopic cylinder 2 located in the fixed cylinder 1 is prone to collide with the inner wall of the upper end cover 11, so that the upper end cover 11 is at risk of being damaged by the collision. Figure 1-Figure 2 As shown, it also includes a plurality of stop springs 41 arranged on the inner wall of the upper end cover 11, and the plurality of stop springs 41 are evenly distributed around the inner slide bar 3. When the pressure from the outside is significantly large, the elastic support of the stop springs 41 can be used to prevent the end surface of the telescopic cylinder 2 located in the fixed cylinder 1 from colliding with the inner wall of the upper end cover 11, thereby reducing the risk of the upper end cover of the fixed cylinder 1 being damaged due to collision.

[0028] Further, as a feasible implementation method, Figure 1-Figure 3As shown, it also includes a sealing rubber ring, which includes an outer cylinder rubber ring 5, a rod body rubber ring 51 and a fixed plate rubber ring 52; the outer cylinder rubber ring 5 is arranged on the outer wall of the telescopic cylinder 2 and fits with the inner wall of the fixed cylinder 1; the rod body rubber ring 51 is arranged inside the telescopic cylinder 2 and fits with the outer wall of the rod body 32; the fixed plate rubber ring 52 is arranged on the side wall of the fixed plate 31 and fits with the inner wall of the telescopic cylinder 2. The sealing rubber ring is arranged between each pair of relatively sliding parts. When the air shock absorber is subjected to shock and bumps, the shock absorbing spring 4 drives the telescopic tube 2 to telescope and slide in the fixed tube 1 through elastic compression and elastic extension. At this time, there is relative sliding between the outer wall of the telescopic tube 2 and the inner wall of the fixed tube 1, the inner wall of one end of the telescopic tube 2 located inside the fixed tube 1 and the outer wall of the rod body 32, and the side wall of the fixed plate 31 and the inner wall of the telescopic tube 2. By setting the sealing rubber ring, when the air shock absorber is working, after the air cavity is continuously pressurized, the slow leakage effect of the sealing rubber ring can be used to slow down the telescopic rate and amplitude of the telescopic tube 2 in the fixed tube 1, so as to achieve the effect of damping and shock absorption. In a specific implementation, in order to make the damping effect achieved by the sealing rubber ring more evenly distributed, it is preferred that, as Figure 1-Figure 3 As shown, the number of the outer cylinder rubber ring 5, the rod body rubber ring 51 and the fixing plate rubber ring 52 are all set to multiple, and the outer cylinder rubber ring 5 on the outer wall of the telescopic cylinder 2 and the rod body rubber ring 51 on the inner wall of the end of the telescopic cylinder 2 are all evenly distributed.

[0029] Further, as a feasible implementation method, Figure 1-Figure 3 As shown, it also includes a plurality of brass slide cylinders 6, which are divided into two groups, and the two groups of brass slide cylinders 6 are respectively arranged on the inner walls at both ends of the fixed cylinder 1. The brass slide cylinder 6 is arranged on the inner wall of the fixed cylinder 1, and is located between the inner wall of the fixed cylinder 1 and the outer wall of the telescopic cylinder 2 when in use. The smooth characteristics of the brass slide cylinder 6 are used to play a cushioning role to prevent abnormal wear of the fixed cylinder 1 and the telescopic cylinder 2.

[0030] Further, as a feasible implementation method, Figure 1-Figure 2 As shown, a mounting ear 7 with a screw hole is provided on the outer wall of the fixing cylinder 1. The mounting ear 7 is used to fix the entire air shock absorber. The use of the mounting ear 7 can increase the installation and use scenarios of the air shock absorber to adapt to more fields of use.

[0031] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only the specific implementation method of the utility model and is not used to limit the protection scope of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A low-cost passive air shock absorber, comprising a fixed cylinder (1) and a telescopic cylinder (2) nested in the fixed cylinder (1), characterized in that: The outer end surfaces of the fixed cylinder (1) and the telescopic cylinder (2) are respectively an upper end cover (11) and a lower end cover (21); a shock-absorbing spring (4) is provided on the inner wall of the lower end cover (21); an inner sliding rod (3) perpendicular to the inner wall of the upper end cover (11) is provided in the center of the inner wall of the upper end cover (11); the telescopic cylinder (2) is slidably mounted on the inner sliding rod (3); The inner sliding rod (3) is a segmented structure, comprising a rod body (32) and a fixed plate (31), wherein the rod body (32) is connected between the inner wall of the upper end cover (11) and the inner end surface of the fixed plate (31); the fixed plate (31) is clamped in the telescopic cylinder (2), and the outer end surface of the fixed plate (31) is connected to the shock-absorbing spring (4); a recoil spring (42) is connected between the inner end surface of the fixed plate (31) and the inner wall of the end of the telescopic cylinder (2); It also includes a plurality of stop springs (41) provided on the inner wall of the upper end cover (11), and the plurality of stop springs (41) are evenly distributed around the inner slide rod (3); It also includes a sealing rubber ring, which includes an outer cylinder rubber ring (5), a rod body rubber ring (51) and a fixed plate rubber ring (52); The outer cylinder rubber ring (5) is arranged on the outer wall of the telescopic cylinder (2) and fits with the inner wall of the fixed cylinder (1); The rod body rubber ring (51) is arranged inside the telescopic cylinder (2) and fits against the outer wall of the rod body (32); The fixing plate rubber ring (52) is arranged on the side wall of the fixing plate (31) and is in contact with the inner side wall of the telescopic cylinder (2); It also includes a plurality of brass slide cylinders (6), each of which is divided into two groups. The two groups of brass slide cylinders (6) are respectively arranged on the inner walls at both ends of the interior of the fixed cylinder (1).

2. A low-cost passive air shock absorber according to claim 1, characterized in that: A mounting ear (7) with a screw hole is provided on the outer side wall of the fixing cylinder (1).

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