Buffer with limiting structure and working method thereof

Abstract

The invention discloses a buffer with a limiting structure and a working method of the buffer, solves the problem that a buffer in the prior art cannot realize self-locking, and has the beneficial effects that the buffer can realize self-locking and can realize quick switching between self-locking and releasing, and the specific scheme is as follows: the buffer with the limiting structure comprises a buffer base, the buffer base is connected with a vehicle chassis, a first cavity and a second cavity are formed in the buffer base and are arranged in a spaced mode, an elastic piece is arranged in the first cavity far away from the vehicle chassis, and a first groove is formed in the outer surface of the buffer base. The buffer base is sleeved with the buffer sleeve in the annular direction, the buffer sleeve can move relative to the buffer base, a limiting block is arranged at the position of the buffer sleeve, the limiting block can rotate relative to the buffer sleeve, and after the limiting block rotates by a set angle, the limiting block rotates. One end of the limiting block can fall into the first groove and abut against the buffer base so that the buffer sleeve can be locked relative to the buffer base.

Description

Technical Field

[0001] The present invention relates to the technical field of buffers, and in particular to a buffer with a limiting structure and a working method thereof. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Trains, especially railway freight cars, usually install buffers on the underframe of the vehicle. The buffers are used to absorb the longitudinal impulse energy of the train, mitigate the impact between vehicles, reduce the longitudinal force of the coupler, reduce the damage to the vehicle and the transported goods, and improve the longitudinal dynamic performance of the train. The buffer usually includes a connecting cylinder and a base. An elastic member is arranged between the connecting cylinder and the base. Considering the locking of the elastic member, the buffer is usually provided with a travel groove and a limit pin to lock the buffer. The limit pin can move along the travel groove to ensure the movement of the buffer. However, there are the following problems:

[0004] The limit pin passes through the connecting tube and is inserted into the base, but there is no way to lock the limit pin and the connecting tube. The movement of the limit pin is limited by the two sides of the travel groove. The travel groove is long, so the position of the buffer cannot be self-locked.

[0005] The connecting tube and the base of the buffer are not easy to disassemble. The connecting tube and the base can only be separated after the limit pin is removed with the help of tools or by replacing parts. Summary of the invention

[0006] In view of the deficiencies in the prior art, an object of the present invention is to provide a buffer with a limiting structure, which can achieve self-locking of the buffer and can be lifted up when the buffer is impacted without interfering with the movement of the buffer.

[0007] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0008] A buffer with a limited position structure, comprising:

[0009] A buffer base, the buffer base is connected to the vehicle chassis, a first cavity and a second cavity are arranged in the buffer base, the first cavity and the second cavity are separated, an elastic member is arranged in the first cavity away from the vehicle chassis, and a first groove is arranged on the outer surface of the buffer base;

[0010] The buffer sleeve is circumferentially sleeved on the buffer base, the buffer sleeve is movable relative to the buffer base, a limit stop is arranged on the buffer sleeve, the limit stop is rotatable relative to the buffer sleeve, after the limit stop is rotated to a set angle, one end of the limit stop can fall into the first groove and abut against the buffer base to realize locking of the buffer sleeve relative to the buffer base, when the buffer is impacted in the direction of the vehicle chassis, the limit stop is squeezed by the buffer base and disengaged from the first groove to realize unlocking of the buffer.

[0011] In the buffer with a limited position structure as described above, when the buffer base abuts against the buffer sleeve, the distance between the first groove and the vehicle underframe is greater than the distance between the limit stop and the vehicle underframe;

[0012] The distance between the connection end of the limit stopper and the buffer sleeve and the vehicle underframe is smaller than the distance between the other end of the limit stopper and the vehicle underframe.

[0013] In the buffer with a limiting structure as described above, a first protrusion is arranged on the outer side of the limiting stop away from the buffer base, and the first protrusion is movably connected to the buffer sleeve.

[0014] In the buffer with a limiting structure as described above, a notch is provided on a side of the limiting stop close to the first protrusion to ensure the rotation of the limiting stop relative to the buffer sleeve.

[0015] As described above, a buffer with a limiting structure has a second protrusion arranged on the outer side of the limiting stop away from the buffer base, the second protrusion is located on one side of the first protrusion, the second protrusion is arranged at a distance from the first protrusion, and the second protrusion is used to facilitate the lifting of the limiting stop.

[0016] A buffer with a limited position structure as described above, wherein a slot hole is provided at the buffer sleeve, the slot hole is a through hole, and the buffer sleeve is provided with third convex parts on both sides of the slot hole, respectively, and the locking pin passes through the third convex part and is provided with the limit stop;

[0017] The shape of the slot hole is consistent with the shape of the first slot.

[0018] In the buffer with a limiting structure as described above, the third protrusion is provided with a first pin hole, the limiting stop is provided with a second pin hole, and the locking pin passes through the first pin hole and the second pin hole and is fixed by a cotter pin.

[0019] In the buffer with a limiting structure as described above, the buffer sleeve includes a connecting tube and a buffer plate, the buffer plate is connected to the connecting tube, and the slot is arranged at the connecting tube.

[0020] A buffer with a limiting structure as described above, the buffer base includes a support plate and a cylinder, the first cavity and the second cavity are arranged in the cylinder, one side of the positioning rod contacts the inner end surface of the buffer sleeve, and the positioning rod passes through the elastic member and can enter the second cavity.

[0021] In a second aspect, the present invention further provides a working method of a buffer with a limiting structure, including the following contents:

[0022] The buffer base is connected to the vehicle chassis, and an elastic member is arranged at the first cavity of the buffer base;

[0023] The limit stop is rotatably mounted on the buffer sleeve;

[0024] The buffer sleeve is placed around the buffer base and pushed toward the vehicle chassis. When the limit stopper falls into the first groove, the buffer is assembled and self-locking is achieved.

[0025] When the buffer is impacted in the direction of the vehicle chassis, the elastic member is compressed, the buffer sleeve as a whole is pushed toward the vehicle chassis, the limit stop is squeezed by the buffer base and is lifted up from the first groove, and at this time the connecting tube is pushed to the right side in an unlocked state until the travel limit is reached;

[0026] When the buffer is not subjected to impact, the elastic member pushes the buffer sleeve to move in a direction away from the vehicle chassis until the limit stop falls into the first groove again.

[0027] The beneficial effects of the present invention are as follows:

[0028] 1) In the present invention, the buffer base is inserted into the buffer sleeve, a first groove is arranged on the surface of the buffer base, and a rotatable limit stop is arranged on the buffer sleeve. The limit stop can be rotated and fall into the first groove to realize self-locking of the buffer. Moreover, after self-locking, when the buffer is impacted in the direction of the vehicle chassis, the buffer sleeve moves relative to the buffer base, and the limit stop is disengaged from the first groove under the squeezing of the buffer base, thereby releasing the buffer. At this time, the buffer sleeve and the buffer base are in a separated state, thereby ensuring the moving stroke of the buffer sleeve relative to the buffer base.

[0029] 2) In the present invention, the limit stop is rotatably arranged relative to the buffer sleeve, so that the buffer sleeve and the buffer base can be quickly separated by pulling the limit stop relative to the buffer sleeve, and the buffer can be disassembled without the assistance of tools or replacement of parts.

[0030] 3) The limit stop structure of the present invention is reasonably arranged. A first protrusion is arranged on the outer side of the limit stop away from the buffer base, and a movable connection is achieved with the buffer sleeve through the first protrusion. A second protrusion is arranged on the limit stop, and the limit stop is easily lifted through the second protrusion.

[0031] 4) The present invention improves the working method of the buffer, and provides specific methods for its installation and self-locking. After locking, when impacted, the limit stopper is squeezed by the buffer base and is lifted up from the first groove. At this time, the connecting tube is pushed to the right and is in an unlocked state until the stroke limit is reached. When the buffer is not subjected to impact, the limit stopper can fall into the first groove again under the action of the elastic member to achieve re-locking. The locking structure is reasonably arranged and can smoothly achieve rapid conversion between the locked state and the released state. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0033] Figure 1 is a schematic diagram of a buffer with a limiting structure according to one or more embodiments of the present invention.

[0034] Figure 2 It is a schematic diagram of a buffer sleeve in a buffer with a limiting structure according to one or more embodiments of the present invention.

[0035] Figure 3 It is a cross-sectional view of a buffer base in a buffer with a limiting structure according to one or more embodiments of the present invention.

[0036] Figure 4 It is a schematic diagram of a buffer with a limiting structure according to one or more embodiments of the present invention when it moves to a maximum stroke after being impacted.

[0037] Figure 5 It is a schematic diagram of a buffer with a limiting structure in a self-locking state according to one or more embodiments of the present invention.

[0038] In the figure: the distances or sizes between parts are exaggerated to show the positions of various parts, and the schematic diagram is for reference only.

[0039] Among them: 1. Buffer sleeve; 2. Buffer base; 3. Elastic member; 4. Positioning rod; 5. Spring support plate; 6. Limit stop; 7. Lock pin;

[0040] 1.1, buffer plate; 1.2, connecting tube; 1.3, slot hole; 1.4, third convex part;

[0041] 2.1, support plate; 2.21, travel cylinder; 2.22, support cylinder; 2.23, first groove; 2.31, second cavity; 2.32, baffle; 2.33, first cavity;

[0042] 6.1. Stopper; 6.2. First protrusion; 6.3. Second protrusion; 6.4. Notch. DETAILED DESCRIPTION

[0043] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0044] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise explicitly stated in the present invention, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof;

[0045] As introduced in the background technology, the buffer in the prior art cannot achieve self-locking. In order to solve the above technical problem, the present invention proposes a buffer with a limit position structure.

[0046] Embodiment 1

[0047] In a typical embodiment of the present invention, reference is made to Figure 1 As shown, a buffer with a limited position structure includes a buffer base 2, the buffer base 2 is connected to the vehicle chassis, a first cavity 2.33 and a second cavity 2.31 are arranged in the buffer base 2, the first cavity 2.33 and the second cavity 2.31 are separated from each other, an elastic member is arranged in the first cavity 2.33 away from the vehicle chassis, and a first groove 2.23 is arranged on the outer surface of the buffer base 2; a buffer sleeve 1, the buffer sleeve 1 is sleeved in the circumferential direction of the buffer base 2, the buffer sleeve 1 is movable relative to the buffer base 2, a limit stop 6 is arranged at the buffer sleeve 1, the limit stop 6 is rotatable relative to the buffer sleeve 1, after the limit stop 6 rotates to a set angle, one end of the limit stop 6 can fall into the first groove 2.23 and abut against the buffer base 2 to realize locking of the buffer sleeve 1 relative to the buffer base 2, when the buffer is impacted in the direction toward the vehicle chassis, the limit stop 6 is squeezed by the buffer base 2 and comes out of the first groove 2.23 to unlock the buffer.

[0048] It should be noted that, when the buffer base 2 and the buffer sleeve 1 are in contact with each other, the distance between the first groove 2.23 and the vehicle underframe is greater than the distance between the limit stop 6 and the vehicle underframe.

[0049] Specifically, the limit stopper 6 is arranged on the upper side of the buffer sleeve 1 to ensure the smooth operation of the limit stopper 6. The distance between the connecting end of the limit stopper 6 and the buffer sleeve 1 and the vehicle underframe is smaller than the distance between the other end of the limit stopper and the vehicle underframe, that is, the connecting end of the limit stopper 6 and the buffer sleeve 1 is arranged close to the vehicle underframe, and the other end of the limit stopper 6 is arranged away from the vehicle underframe.

[0050] refer to Figure 2 As shown, the buffer sleeve 1 includes a connecting tube 1.2 and a buffer plate 1.1. The buffer plate 1.1 is located at the end of the connecting tube 1.2. The width of the buffer plate 1.1 is greater than the outer diameter of the connecting tube 1.2. The side of the buffer plate 1.1 away from the connecting tube 1.2 is an arc surface. A through slot 1.3 is opened on one side of the connecting tube 1.2. The shape of the slot 1.3 is rectangular. Third protrusions 1.4 are respectively arranged on both sides of the slot 1.3. The third protrusion 1.4 is provided with a first pin hole, and a locking pin 7 is installed through the first pin hole. The limit stopper 6 is located at the slot 1.3. The locking pin 7 passes through the first pin hole of the third protrusion 1.4 on one side, the limit stopper 6 and the first pin hole of the third protrusion on the other side in sequence.

[0051] refer to Figure 3 As shown, the buffer base 2 includes a support plate 2.1 and a cylinder, and the support plate 2.1 is provided with a plurality of bolt holes, specifically 4 bolt holes, for fixing the buffer base 2 with bolts;

[0052] It is easy to understand that the cylinder includes a stroke cylinder 2.21 and a support cylinder 2.22, the stroke cylinder 2.21 and the support cylinder 2.22 are connected, the stroke cylinder 2.21 is connected to the support plate 2.1, the width of the support plate is greater than the outer diameter of the stroke cylinder 2.21, the outer diameter of the stroke cylinder 2.21 is smaller than the outer diameter of the support cylinder 2.22, the length of the stroke cylinder 2.21 is smaller than the length of the support cylinder 2.22, the length of the stroke cylinder 2.21 is the buffer stroke, the buffer sleeve 1 is supported by the support cylinder 2.22 when the buffer is in a self-locking state, and when the buffer is impacted, the buffer sleeve moves along the stroke cylinder 2.21;

[0053] In this embodiment, an annular protrusion is provided at one end of the stroke cylinder 2.21 close to the support plate, and the outer diameter of the annular protrusion is larger than the outer diameter of the stroke cylinder 2.21, and the movement of the buffer sleeve 1 is limited by the annular protrusion;

[0054] Specifically, a first groove 2.23 is opened on the outer surface of the support cylinder 2.22. The first groove 2.23 is a non-through groove. The length of the first groove 2.23 is slightly larger than the length of the slot 1.3 at the connecting cylinder. The position of the first groove 2.23 is set on the outer surface of the support cylinder 2.22. The first groove 2.23 is specifically set at a position aligned with the slot 1.3 of the connecting cylinder when the buffer is in the released state.

[0055] It should be noted that there are two sections inside the cylinder body, namely the first cavity 2.33 and the second cavity 2.31. The second cavity 2.31 is specifically a stroke cavity. The length of the second cavity is greater than the length of the stroke cylinder body. The second cavity 2.31 is connected to the support plate 2.1. The first cavity 2.33 and the second cavity 2.31 are separated by a baffle 2.32. A round hole is provided at the center of the baffle. The first cavity 2.33 is used to place the elastic member 3. The elastic member 3 is specifically a plurality of rubber springs. A spring partition is provided between adjacent rubber springs. When the elastic member 3 is in a free state, the distance between the end of the connecting cylinder close to the support plate and the support plate 2.1 (i.e., the length of the stroke cylinder body) is the buffer stroke, and the maximum compression deflection of the elastic member is greater than or equal to the buffer stroke.

[0056] Wherein, a spring support plate 5 is provided on one side of the baffle 2.32 facing the first cavity 2.33. The spring support plate 5 is circular. An opening is provided at the center of the spring support plate 5. The outer diameter of the spring support plate 5 is slightly smaller than the inner diameter of the first cavity 2.33. A notch 6.4 is provided at the outer edge of the spring support plate 5 close to the baffle 2.32. The thickness of the spring support plate 5 is greater than the thickness of the partition. A through hole is provided in the middle of the spring support plate 5 for the positioning rod 4 to pass through. The inner diameter of the through hole is slightly larger than the diameter of the positioning rod 4.

[0057] It is easy to understand that a connecting plate is provided at one end of the positioning rod 4. The connecting plate is a circular plate. The diameter of the circular plate is smaller than the inner diameter of the buffer sleeve. The connecting plate is perpendicularly connected to the positioning rod 4. One end of the positioning rod 4 contacts the inner end surface of the buffer plate 1.1. The rod body length of the positioning rod 4 is smaller than the length of the cylinder body. The positioning rod 4 passes through the elastic member 3 and the baffle 2.32. The positioning rod 4 is specifically a metal oblong rod.

[0058] Reference Figure 4 As shown, the limit stop 6 includes a stop block 6.1. The shape of the stop block 6.1 is the same as the shape of the slot hole at the connecting cylinder. The stop block 6.1 can specifically be a rectangular shape. The width of the stop block 6.1 is smaller than the width of the slot hole 1.3 at the connecting cylinder. A first convex portion 6.2 is provided on one side of the stop block 6.1. The first convex portion 6.2 is fixedly connected to the stop block 6.1. The first convex portion 6.2 can be placed between two third convex portions 1.4. A second pin hole is provided in the first convex portion 6.2. The inner diameter of the second pin hole is the same as the inner diameter of the first pin hole at the third convex portion. The locking pin 7 passes through the second pin hole of the first convex portion; moreover, it is easy to understand that the distance between the second pin hole of the first convex portion 6.2 and the outer surface of the stop block is the same as the distance between the first pin hole of the convex portion and the outer edge of the slot hole at the connecting cylinder.

[0059] In this embodiment, the side of the stop block 6.1 close to the stroke cylinder body is chamfered so that a notch 6.4 is provided on the side of the stop block close to the first convex portion 6.2 to make room for the rotation of the stop block 6.1.

[0060] In addition, a second protrusion 6.3 is provided on one side of the stopper 6.1, and the central axis of the second protrusion 6.3 is perpendicular to the central axis of the first protrusion 6.2. The inner diameter of the second protrusion 6.3 is 18-22 mm. The second protrusion 6.3 can be exposed to the connecting tube 1.2, and the second protrusion is arranged beyond the first protrusion away from the side of the stopper.

[0061] The buffer provided in this embodiment has a buffer base 2 inserted into the buffer sleeve 1, a first groove 2.23 is arranged on the surface of the buffer base 2, and a rotatable limit stop 6 is arranged on the buffer sleeve 1. The limit stop 6 can be rotated and fall into the first groove 2.23 to realize self-locking of the buffer. Moreover, after self-locking, when the buffer is impacted in the direction of the vehicle chassis, the buffer sleeve 1 moves relative to the buffer base 2, and the limit stop 6 is disengaged from the first groove 2.23 under the squeezing of the buffer base, thereby releasing the buffer. At this time, the buffer sleeve 1 and the buffer base 2 are in a separated state, thereby ensuring the moving stroke of the buffer sleeve relative to the buffer base.

[0062] Embodiment 2

[0063] This embodiment provides a working method of a buffer with a limited position structure, including the following contents:

[0064] Set the buffer base fixed end at Figure 4 On the right side, the impact end of the buffer sleeve is Figure 4 The left side of the , the directions in the following instructions are based on this;

[0065] The buffer base 2 is connected to the vehicle chassis by bolt connection;

[0066] Put the spring support plate 5 and the elastic member 3 into the first cavity 2.33 in sequence, and then insert the positioning rod 4 to fix them;

[0067] The limit stopper 6 is placed in the slot 1.3 at the connecting tube, and the locking pin 7 connects the limit stopper 6 and the third protrusion 1.4 and is fixed by a split pin;

[0068] refer to Figure 5 As shown, the buffer sleeve 1 is put on the buffer base 2 and pushed toward the support plate 2.1. When the connecting tube slot is aligned with the first slot, the limit stop 6 falls into the first slot 2.23. At this time, the buffer is assembled and self-locking is completed.

[0069] When the buffer is impacted in the direction of the buffer base 2, the elastic member is compressed, the buffer sleeve is pushed toward the vehicle chassis, and the lower right side of the limit stop is squeezed by the outside of the cylinder in the buffer base and is lifted up from the first groove to be parallel to the connecting cylinder. Figure 4 As shown, at this time, the connecting cylinder is pushed to the right and is in an unlocked state until the stroke limit is reached.

[0070] When the buffer is not subjected to impact, the elastic member 3 rebounds and pushes the buffer sleeve 1 to move away from the vehicle chassis until the limit stop 6 falls into the first groove again. At this time, the left end of the limit stop presses against the inner wall of the first groove, so that the buffer sleeve 1 is locked and cannot continue to move to the left.

[0071] When maintenance and disassembly are required, the operator only needs to pull the second protrusion 6.3 by hand to pull the limit stop 6. When the limit stop is pulled to be parallel to the connecting tube 1.2, the buffer sleeve and the buffer base are in an unlocked state, and the buffer sleeve can be removed from the buffer base.

[0072] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A buffer with a limited position structure, characterized in that: include: A buffer base, the buffer base is connected to the vehicle chassis, a first cavity and a second cavity are arranged in the buffer base, the first cavity and the second cavity are separated, an elastic member is arranged in the first cavity away from the vehicle chassis, and a first groove is arranged on the outer surface of the buffer base; The buffer sleeve is circumferentially sleeved on the buffer base, the buffer sleeve is movable relative to the buffer base, a limit stop is arranged on the buffer sleeve, the limit stop is rotatable relative to the buffer sleeve, after the limit stop is rotated to a set angle, one end of the limit stop can fall into the first groove and abut against the buffer base to realize locking of the buffer sleeve relative to the buffer base, when the buffer is impacted in the direction of the vehicle chassis, the limit stop is squeezed by the buffer base and disengaged from the first groove to realize unlocking of the buffer.

2. A buffer with a limiting structure according to claim 1, characterized in that: When the buffer base abuts against the buffer sleeve, the distance between the first groove and the vehicle underframe is greater than the distance between the limit stop and the vehicle underframe; The distance between the connection end of the limit stopper and the buffer sleeve and the vehicle underframe is smaller than the distance between the other end of the limit stopper and the vehicle underframe.

3. The buffer with a limiting structure according to claim 1, characterized in that: The limit stop is provided with a first protrusion on the outer side surface away from the buffer base, and the first protrusion is movably connected to the buffer sleeve.

4. The buffer with a limiting structure according to claim 3, characterized in that: A notch is provided on one side of the limit stop close to the first protrusion to ensure the rotation of the limit stop relative to the buffer sleeve.

5. The buffer with a limiting structure according to claim 3, characterized in that: A second protrusion is arranged on the outer side of the limit stop away from the buffer base, the second protrusion is located on one side of the first protrusion, the second protrusion is arranged at a distance from the first protrusion, and the second protrusion is used to facilitate the lifting of the limit stop.

6. The buffer with a limiting structure according to claim 1, characterized in that: The buffer sleeve is provided with a slot hole, which is a through hole, and the buffer sleeve is provided with third convex parts on both sides of the slot hole, and the lock pin passes through the third convex part and is provided with the limit stop; The shape of the slot hole is consistent with the shape of the first slot.

7. The buffer with a limiting structure according to claim 6, characterized in that: The third protrusion is provided with a first pin hole, the limit stop is provided with a second pin hole, and the locking pin passes through the first pin hole and the second pin hole and is fixed by a cotter pin.

8. The buffer with a limiting structure according to claim 6, characterized in that: The buffer sleeve comprises a connecting tube and a buffer plate, the buffer plate is connected to the connecting tube, and the slot is arranged at the connecting tube.

9. The buffer with a limiting structure according to claim 1, characterized in that: The buffer base includes a support plate and a cylinder, the first cavity and the second cavity are arranged in the cylinder, one side of the positioning rod contacts the inner end surface of the buffer sleeve, and the positioning rod passes through the elastic member and can enter the second cavity.

10. A working method of a buffer with a limiting structure according to any one of claims 1 to 9, characterized in that: It includes the following: The buffer base is connected to the vehicle chassis, and an elastic member is arranged at the first cavity of the buffer base; The limit stop is rotatably mounted on the buffer sleeve; The buffer sleeve is placed around the buffer base and pushed toward the vehicle chassis. When the limit stopper falls into the first groove, the buffer is assembled and self-locking is achieved. When the buffer is impacted in the direction of the vehicle chassis, the elastic member is compressed, the buffer sleeve as a whole is pushed toward the vehicle chassis, the limit stop is squeezed by the buffer base and is lifted up from the first groove, and at this time the connecting tube is pushed to the right side in an unlocked state until the travel limit is reached; When the buffer is not subjected to impact, the elastic member pushes the buffer sleeve to move in a direction away from the vehicle chassis until the limit stop falls into the first groove again.

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