CN113460875A

CN113460875A - Telescopic machanism buffer stop and hoist

Info

Publication number: CN113460875A
Application number: CN202110845106.1A
Authority: CN
Inventors: 周东才; 吴乐尧; 王孝忱
Original assignee: Hunan Sany Port Equipment Co Ltd; Sany Marine Heavy Industry Co Ltd
Current assignee: Hunan Sany Port Equipment Co Ltd; Sany Marine Heavy Industry Co Ltd
Priority date: 2021-07-26
Filing date: 2021-07-26
Publication date: 2021-10-01
Anticipated expiration: 2041-07-26
Also published as: CN113460875B

Abstract

The application relates to the technical field of mechanical equipment, specifically provides a telescopic machanism buffer stop and hoist, and telescopic machanism buffer stop includes: positioning mechanism and stop gear, positioning mechanism install on first components of a whole that can function independently, and stop gear installs on the second components of a whole that can function independently, and stop gear structure is: when the second split body stretches to a specific position relative to the first split body, the positioning mechanism is locked, and when the interaction force of the limiting mechanism and the positioning mechanism is larger than a threshold value, the limiting mechanism and the positioning mechanism are mutually released. When the positioning mechanism is used, when the second split body moves to a specific position, the limiting mechanism can lock the positioning mechanism. When the second body receives the ascending striking of the side that contracts, partly by stop gear and positioning mechanism bear in the impact that the second body received, avoided second body self to bear all impact to play the effect of protection second body, reduced the damage rate when the second body receives the ascending striking of the side that contracts to a certain extent.

Description

Telescopic machanism buffer stop and hoist

Technical Field

The application relates to the technical field of mechanical equipment, in particular to a telescopic mechanism anti-collision device and a lifting appliance.

Background

At present, because a plurality of transport vehicles are transported in container yard operation sites such as wharfs, railways and the like, and containers are stacked more densely, when a reach stacker and a stacker operate, a second split body of a spreader system is easy to collide with other vehicles or barriers in a slight side face mode after extending out. Especially when the great size container of hoisting load, the telescopic girder extends longer state, and when hoist system received the side impact, very easily lead to the second body and with the structure of second body linkage take place to damage, just so can do not can the reworking after just needing to maintain the structure of second body and with the linkage of second body, lead to reducing the operating efficiency and improved enterprise cost of maintenance.

Content of application

In view of this, the application provides telescopic machanism buffer stop and hoist, has solved the second body and has damaged the second body and the problem of the structure of linkage with the second body very easily when receiving the side impact after the extension.

In a first aspect, the anti-collision device for the telescopic mechanism is applicable to a telescopic mechanism, the telescopic mechanism comprises a first split body and a second split body, and the second split body is telescopically mounted on the first split body along the length direction of the first split body; wherein, telescopic machanism buffer stop includes: the positioning mechanism is arranged on the first split body; and a limiting mechanism installed on the second split body, the limiting mechanism being configured to: when the second split body stretches and retracts to a specific position relative to the first split body, the positioning mechanism is locked, and when the interaction force between the limiting mechanism and the positioning mechanism is larger than a threshold value, the limiting mechanism and the positioning mechanism are mutually released.

When the positioning mechanism is used, when the second split body moves to a specific position, the positioning mechanism can be locked by the limiting mechanism, and the limiting effect exerted on the positioning mechanism by the limiting mechanism is equivalent to the limiting effect of the first split body on the second split body. When the second body receives the ascending striking of the side that contracts, partly by stop gear and positioning mechanism bear in the impact that the second body received, avoided second body self to bear all impact to play the effect of protection second body, reduced the damage rate when the second body receives the ascending striking of the side that contracts to a certain extent. When the second body is linked with some other mechanism, such as a power assembly, the effect of protecting other structures linked with the second body can also be achieved.

With reference to the first aspect, in a possible implementation manner, the limiting mechanism includes: the limiting plate is arranged on the second split body, and a limiting groove is formed in one surface, facing the positioning mechanism, of the limiting plate; when the second sub-body stretches to a specific position relative to the first sub-body, the positioning mechanism is clamped into the limiting groove, and the positioning mechanism is separated from the limiting groove when the interaction force between the limiting groove and the positioning mechanism is greater than the threshold value.

With reference to the first aspect, in one possible implementation manner, the positioning mechanism includes: the positioning pin is arranged on the first split body; when the second split body stretches to a specific position relative to the first split body, the positioning pin is clamped into the limiting groove towards one end of the limiting plate, and when the interaction force of the limiting groove and the positioning pin is larger than the threshold value, the positioning pin is separated from the limiting groove.

With reference to the first aspect, in a possible implementation manner, the end of the positioning pin facing the limiting plate has a first inclined surface and a vertical surface, the first inclined surface faces a retraction direction of the second component, the vertical surface faces an extension direction of the second component, and the first inclined surface is inclined from the retraction direction toward the extension direction.

With reference to the first aspect, in a possible implementation manner, the positioning mechanism further includes: an elastic assembly through which the positioning pin is elastically connected to the first split body.

With reference to the first aspect, in a possible implementation manner, the second split body is provided with a step hole, and the positioning pin penetrates through the step hole from one side of the second split body to the other side of the second split body; the positioning mechanism further comprises a nut, an external thread is arranged on a pin body of the positioning pin, and the nut is screwed on the external thread of the part, penetrating out of the stepped hole, of the positioning pin; the elastic assembly comprises a spring, the spring is sleeved on the pin body of the positioning pin, one end of the spring is connected with the pin body of the positioning pin, and the other end of the spring extends into the step hole and is mutually abutted to the step of the step hole.

With reference to the first aspect, in a possible implementation manner, one surface of the limiting plate, which faces the positioning mechanism, is provided with at least one second inclined surface, and the second inclined surface is adjacent to the limiting groove; and one end of the positioning pin, which faces the limiting plate, is provided with a cambered surface.

With reference to the first aspect, in a possible implementation manner, the limiting mechanism includes: the first boss is arranged on the second sub-body; the positioning mechanism includes: the second boss is arranged on the first split body; when the second sub-body extends to a specific position relative to the first sub-body, the first boss is clamped on a first side of the second boss, and the first side is the side, back to the retraction direction of the second sub-body, of the second boss.

In a second aspect, the present application provides a spreader comprising: a main beam; the telescopic beam is telescopically arranged on the main beam; and a telescoping mechanism bump guard in any of the foregoing implementations; the positioning mechanism is installed on the main beam, and the limiting mechanism is installed on the telescopic beam.

Because this aspect has included the telescopic machanism buffer stop in aforementioned any implementation, consequently has any above-mentioned telescopic machanism buffer stop's technical effect, does not describe herein again.

With reference to the second aspect, in one possible implementation manner, the spreader further includes: the telescopic oil cylinder comprises a cylinder body and an oil rod, wherein the cylinder body is installed on the main beam, and the oil rod is linked with the telescopic beam.

With reference to the second aspect, in a possible implementation manner, the telescopic cylinder includes: the hydraulic reversing valve adopts a hydraulic reversing valve with Y-shaped function.

Drawings

Fig. 1 is a schematic partial structural view of a crash-proof device of a telescopic mechanism according to an embodiment of the present disclosure.

Fig. 2 is a schematic structural diagram of a limiting plate in a collision avoidance device of a telescopic mechanism according to an embodiment of the present application.

Fig. 3 is a schematic structural view of a positioning pin in a crash-proof device of a telescoping mechanism according to an embodiment of the present application.

Fig. 4 is a schematic structural diagram of a positioning pin according to an embodiment of the present application.

Fig. 5 is a schematic view of the structure of fig. 1 without the positioning pin.

Fig. 6 is a partial schematic structural view of a crash-proof device of a telescopic mechanism according to another embodiment of the present application.

Fig. 7 is a schematic structural diagram of a spreader according to an embodiment of the present application.

Fig. 8 is a partial schematic structural view of the spreader shown in fig. 7.

Fig. 9 shows a front view of the spreader of fig. 7.

Fig. 10 is a schematic diagram of a hydraulic structure of a hydraulic directional valve with a Y-shaped function.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The application provides a telescopic machanism buffer stop, this telescopic machanism buffer stop is applicable to a telescopic machanism, as shown in figure 1, and telescopic machanism includes first components of a whole that can function independently 1 and second components of a whole that can function independently 2, and second components of a whole that can function independently 2 is installed on first components of a whole that can function independently 1 along the length direction of first components of a whole that can function independently 1 is flexible, and at the during operation, second components of a whole that can function independently 2 can be for first components of a whole that can function independently 1 concertina movement.

Fig. 1 is a schematic partial structural view of a crash-proof device of a telescopic mechanism according to an embodiment of the present disclosure. In some embodiments, as shown in fig. 1, the telescoping mechanism bump guard includes: a positioning mechanism 3 and a limiting mechanism 4. The positioning mechanism 3 is mounted on the first split body 1. Stop gear 4 installs on second components of a whole that can function independently 2, stop gear 4 constructs to be: the positioning mechanism 3 is locked when the second split body 2 is extended and contracted to a specific position relative to the first split body 1, and the mutual release is realized when the interaction force between the limiting mechanism 4 and the positioning mechanism 3 is larger than a threshold value.

In use, when the second sub-body 2 moves to a specific position, the limiting mechanism 4 can lock the positioning mechanism 3, and at this time, the limiting effect of the limiting mechanism 4 on the positioning mechanism 3 is equivalent to the limiting effect of the first sub-body 1 on the second sub-body 2. When the second body 2 is impacted in the retraction direction, one part of the impact force received by the second body 2 is borne by the limiting mechanism 4 and the positioning mechanism 3, so that the second body 2 is prevented from bearing all the impact force, the effect of protecting the second body 2 is achieved, and the damage rate of the second body 2 when impacted in the retraction direction is reduced to a certain extent. When the second body is linked with some other mechanism, such as a power assembly, the effect of protecting other structures linked with the second body can also be achieved. The specific position may refer to a relative position where the second section 2 extends and contracts relative to the first section 1, may be a position where the second section 2 extends to the longest relative to the first section 1, or may be some other position where the second section 2 needs to be protected.

When the impact force makes the interaction force of the limiting mechanism 4 and the positioning mechanism 3 greater than the threshold value, the limiting mechanism 4 no longer locks the positioning mechanism 3, the threshold value can be designed in advance, and the threshold value can avoid the damage of the limiting mechanism 4 and the positioning mechanism 3. The protective action of the limiting mechanism 4 and the positioning mechanism 3 on the second component 2 is determined by the threshold value, and the larger the threshold value is, the stronger the protective action is. The threshold value can be reached to a required value in advance through the structural design and material selection of the limiting mechanism 4 and the positioning mechanism 3.

Fig. 2 is a schematic structural diagram of a limiting plate in a collision avoidance device of a telescopic mechanism according to an embodiment of the present application. In some embodiments, as shown in fig. 1 and 2 in combination, the limiting mechanism 4 includes: and the limiting plate 401 is installed on the second split body 2, and one surface, facing the positioning mechanism 3, of the limiting plate 401 is provided with a limiting groove 4011. When the second sub-body 2 stretches to a specific position relative to the first sub-body 1, the positioning mechanism 3 is clamped into the limiting groove 4011, and the positioning mechanism 3 is separated from the limiting groove 4011 when the interaction force of the limiting groove 4011 and the positioning mechanism 3 is greater than a threshold value.

When this embodiment is used, when positioning mechanism 3 card goes into spacing recess 4011, spacing recess 4011 plays limiting displacement to positioning mechanism 3, is equivalent to the limiting displacement of first components of a whole that can function independently 1 to second components of a whole that can function independently 2. However, the limiting groove 4011 has a limited acting force for limiting the positioning mechanism 3, when the second component 2 is impacted by a sufficient impact force and the acting force applied to the limiting groove 4011 by the positioning mechanism 3 is greater than a threshold value, the positioning mechanism 3 can be separated from the limiting groove 4011, and the mutual locking between the positioning mechanism 3 and the limiting groove 4011 is released.

Fig. 3 is a schematic structural view of a positioning pin in a crash-proof device of a telescoping mechanism according to an embodiment of the present application. In some embodiments, as shown in fig. 1 and 3, the positioning mechanism 3 comprises: and a positioning pin 301, wherein the positioning pin 301 is mounted on the first split body 1. When the second component 2 stretches to a specific position relative to the first component 1, the positioning pin 301 is clamped into the limiting groove 4011 towards one end of the limiting plate 401, and when the interaction force of the limiting groove 4011 and the positioning pin 301 is larger than a threshold value, the positioning pin 301 is separated from the limiting groove 4011. In this embodiment, the positioning pin 301 is clamped into the limiting groove 4011 to lock the positioning mechanism 3 and the limiting mechanism 4 with each other. In the process that the second component 2 moves to a specific position, the positioning pin 301 continuously approaches the limiting groove 4011 until the positioning pin is clamped into the limiting groove 4011, and the limiting groove 4011 locks the positioning pin 301.

Fig. 4 is a schematic structural diagram of a positioning pin according to an embodiment of the present application. In some embodiments, as shown in fig. 4, the end of the positioning pin 301 facing the limiting plate 401 has a first inclined surface 3011 and a vertical surface 3012, the first inclined surface 3011 faces the retraction direction of the second body 2, the vertical surface 3012 faces the extension direction of the second body 2, and the first inclined surface 3011 is inclined from the retraction direction to the extension direction. Under the action of the first inclined surface 3011, when the second sub-body 2 is impacted in the retraction direction, the positioning pin 301 is more easily separated from the limiting groove 4011 of the limiting plate 401. And under the effect of the vertical surface 3012, after the positioning pin 301 is clamped in the limiting groove 4011, the second component 2 is less likely to move towards the extending direction.

In some embodiments, referring to the structure of fig. 3, the shape of the end of the position pin 301 facing the position restriction plate 401 matches the shape of the position restriction groove 4011. Specifically, the shape of the end of the positioning pin 301 facing the position limiting plate 401 may be a hemisphere, an ellipsoid, or a part of a sphere.

In some embodiments, as shown in fig. 1, the positioning mechanism 3 further comprises: an elastic member 302, and a positioning pin 301 elastically connected to the first body 1 via the elastic member 302. In the present embodiment, the positioning pin 301 can have a certain amount of free movement relative to the first division body 1 by the elastic member 302. So that the positioning pin 301 is clamped into and separated from the limiting groove 4011, the interaction force of the limiting groove 4011 and the positioning pin 301 presses the elastic component 302, and the positioning pin 301 moves to separate from the limiting groove 4011.

Fig. 5 is a schematic view of the structure of fig. 1 without the positioning pin. In some embodiments, as shown in fig. 1 and 5, the second component 1 is provided with a step hole 101, and the positioning pin 301 passes through the step hole 101 from one side of the second component 1 to the other side of the second component 1; the positioning mechanism 3 further includes a nut 303, the pin body of the positioning pin 301 has an external thread, and the nut 303 is screwed on the external thread of the portion of the positioning pin 301 that passes through the stepped hole 101. The elastic assembly 302 comprises a spring, the spring is sleeved on the pin body of the positioning pin 301, one end of the spring is connected with the pin body of the positioning pin 301, and the other end of the spring extends into the step hole 101 and is mutually abutted to the step of the step hole 101.

When the positioning pin is used, the nut 303 limits the positioning pin 301, so that the positioning pin 301 is prevented from being separated from the stepped hole 101. Under the action of the spring, the positioning pin 301 can move in the up-and-down direction shown in fig. 1, and in the process that the second component 1 drives the positioning pin 301 to move towards the limiting groove 4011, the positioning pin 301 is firstly pressed downwards, and when the positioning pin enters the limiting groove 4011, the spring rebounds the positioning pin 301 upwards, so that the top end of the positioning pin 301 is clamped into the limiting groove 4011. When the second body 1 receives the great impact of the retraction direction, the limiting groove 4011 can not continue to lock the positioning pin 301, the positioning pin 301 moves downwards to disengage from the limiting groove 4011, the positioning pin 301 disengages from the limiting groove 4011 and is not contacted with the limiting plate 401 any more, and the positioning pin 301 is rebounded upwards by the spring until the nut 303 is abutted against the second body 1. Furthermore, the nut 303 can be rotated to adjust the resilience of the spring to the positioning pin 301, which determines how easily the positioning pin 301 is disengaged from the limiting recess 4011, i.e. determines the predetermined threshold of the aforementioned interaction force. The larger the repulsive force is, the closer the contact between the positioning pin 301 and the stopper recess 4011 is, and the more difficult it is for the positioning pin 301 to come out of the stopper recess 4011. When it is desired to increase the aforementioned preset threshold, the spring with the larger spring force may be replaced, or the nut 303 may be rotated so that the positioning pin 301 is moved toward the nut 303.

In some embodiments, as shown in fig. 1, a surface of the position limiting plate 401 facing the positioning mechanism 3 has at least one second inclined surface 4012, and the second inclined surface 4012 is disposed adjacent to the position limiting groove 4011. One end of positioning pin 301 facing stopper plate 401 has a curved surface. When the positioning pin device is used, the second component 1 drives the positioning pin 301 to move towards the limiting groove 4011, the second inclined surface 4012 and the arc surface of the positioning pin 301 are matched with each other, and the positioning pin 301 can conveniently slide into the limiting groove 4011 more easily.

Fig. 6 is a partial schematic structural view of a crash-proof device of a telescopic mechanism according to another embodiment of the present application. In some embodiments, as shown in fig. 6, the spacing mechanism 4 includes a first boss 402, the first boss 402 being mounted on the second body 2. The positioning mechanism 3 comprises a second boss 304, and the second boss 304 is mounted on the first split body 1. When the second body 2 extends to a specific position relative to the first body 1, the first boss 402 is clamped on a first side of the second boss 304, and the first side is a side of the second boss 304 facing away from the retraction direction of the second body 2. In use, when the second block 2 extends, the first boss 402 collides with the second boss 304, the second block 2 extends to a specific position, and finally the first boss 402 reaches the left side of the second boss 304, and the second boss 304 limits the first boss 402 on the left side. When the second block 2 is impacted in the retraction direction, and the interaction force between the first boss 402 and the second boss 304 is greater than the threshold value, the second boss 304 cannot limit the first boss 402 any more, and the first boss 402 breaks through the limit of the second boss 304 and moves toward the direction pointed by the first side.

Fig. 7 is a schematic structural diagram of a spreader according to an embodiment of the present application. Fig. 8 is a partial schematic structural view of the spreader shown in fig. 7. The present application also provides a spreader, which in some embodiments, as shown in fig. 7 and 8, comprises: main beam 5, telescopic beam 6 and the telescopic mechanism anti-collision device. The telescopic beam 6 is telescopically arranged on the main beam 5. Wherein, telescopic machanism buffer stop's positioning mechanism 3 is installed on girder 5, and stop gear 4 is installed on telescopic girder 6. In use, the telescopic beam 6 can move telescopically along the main beam 5, and when the telescopic beam 6 extends to a specific position, the limiting mechanism 4 locks the positioning mechanism 3. When the lifting appliance works, if the telescopic beam 6 is impacted in the retraction direction, part of impact force is borne by the limiting mechanism 4 and the positioning mechanism 3, the telescopic beam 6 and the main beam 5 are protected, and the telescopic beam 6 and the main beam 5 are prevented from being damaged due to overlarge stress. After the positioning mechanism 3 is separated from the limiting mechanism 4, the positioning mechanism 3 continues to move along with the telescopic beam 6, and the size of the positioning mechanism 3 is designed in advance, so that the positioning mechanism 3 cannot rub with the main beam 5.

In particular, the spreader may further include a turntable assembly 10, and the spreader may be mounted to the boom of the crane via the turntable assembly 10.

Fig. 9 shows a front view of the spreader of fig. 7. As shown in fig. 9, a telescopic beam 6 may be provided on each of the left and right sides of the main beam 5, and the telescopic mechanism collision prevention devices 7 may be installed at the positions shown in the drawing. The two telescopic mechanism anti-collision devices 7 correspond to the two telescopic beams 6 on the left side and the right side and respectively play a role in protecting the two telescopic beams 6 on the left side and the right side. Specifically, the specific position of the telescopic beam 6 when the positioning mechanism 3 is locked by the limiting mechanism 4 can be one or more. For example, the two specific locations may be two, which may correspond to two conditions when the spreader is used to hoist a 20 inch or 40 inch container, improving the force experienced when a 20 inch or 40 foot container is side hit. The position of the telescopic mechanism collision avoidance apparatus 7 is not limited to the position shown in fig. 9, and may be provided above or on the side of the telescopic beam 6.

In some embodiments, as shown in fig. 7, the spreader further comprises: the telescopic oil cylinder 8 comprises a cylinder body and an oil rod, the cylinder body is installed on the main beam 5, and the oil rod is linked with the telescopic beam 6. When the telescopic hydraulic cylinder is used, the main beam 5 provides support for the cylinder body, and the telescopic oil cylinder 8 applies force to the telescopic beam 6 to enable the telescopic beam 6 to move in a telescopic mode. When the telescopic beam 6 extends and the telescopic beam 6 is impacted in the retraction direction, if the telescopic mechanism anti-collision device is not provided, the telescopic oil cylinder 8 is impacted by a large impact force, and the telescopic oil cylinder 8 is easily damaged. When the telescopic beam 6 extends to a specific position and the limiting mechanism 4 locks the positioning mechanism 3, the telescopic mechanism anti-collision device can protect the telescopic cylinder 8 while protecting the telescopic beam 6 and the main beam 5. In this embodiment, the anti-collision device of the telescopic mechanism bears a part of the impact force, so that the telescopic cylinder 8 is not easy to damage.

In some embodiments, the telescopic cylinder 8 comprises: the hydraulic reversing valve adopts a hydraulic reversing valve with Y-shaped function. In this embodiment, the switching-over valve of flexible hydro-cylinder 8 adopts hydraulic pressure switching-over valve to hydraulic pressure switching-over valve is Y type function, makes to have certain floating range after the beam rod extension, when flexible roof beam 6 received the side direction striking, and the beam rod can float certain range, and the unsteady difficult buckling of messenger's beam rod of beam rod. Fig. 10 shows a schematic diagram of a hydraulic structure of a hydraulic directional valve with a Y-shaped function. Because the length of the oil rod of the telescopic oil cylinder 8 is long, the telescopic oil cylinder is easy to be unstably bent after being stressed, and the telescopic oil cylinder 8 is of a precise structure and is easy to be damaged by impact force. Based on this embodiment, when the hoist after the improvement received the side impact, stop gear 4 cooperation positioning mechanism 3 shared a part of impact force to telescopic cylinder 8's beam hanger is in the floating condition, receives corresponding follow-up when external force strikes, has consequently protected telescopic cylinder 8's structure, reduces telescopic cylinder 8's spoilage.

The foregoing describes the general principles of the present application in conjunction with specific embodiments, however, it is noted that the advantages, effects, etc. mentioned in the present application are merely examples and are not limiting, and they should not be considered essential to the various embodiments of the present application. Furthermore, the foregoing disclosure of specific details is for the purpose of illustration and description and is not intended to be limiting, since the foregoing disclosure is not intended to be exhaustive or to limit the disclosure to the precise details disclosed.

The block diagrams of devices, apparatuses, systems referred to in this application are only given as illustrative examples and are not intended to require or imply that the connections, arrangements, configurations, etc. must be made in the manner shown in the block diagrams. These devices, apparatuses, devices, systems may be connected, arranged, configured in any manner, as will be appreciated by those skilled in the art. Words such as "including," "comprising," "having," and the like are open-ended words that mean "including, but not limited to," and are used interchangeably therewith. The words "or" and "as used herein mean, and are used interchangeably with, the word" and/or, "unless the context clearly dictates otherwise. The word "such as" is used herein to mean, and is used interchangeably with, the phrase "such as but not limited to".

It should also be noted that in the apparatus and devices of the present application, the components may be disassembled and/or reassembled. These decompositions and/or recombinations are to be considered as equivalents of the present application.

The previous description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects without departing from the scope of the application. Thus, the present application is not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modifications, equivalents and the like that are within the spirit and principle of the present application should be included in the scope of the present application.

Claims

1. The anti-collision device for the telescopic mechanism is characterized by being suitable for the telescopic mechanism, wherein the telescopic mechanism comprises a first split body and a second split body, and the second split body is telescopically arranged on the first split body along the length direction of the first split body;

wherein, telescopic machanism buffer stop includes:

the positioning mechanism is arranged on the first split body; and

a limiting mechanism installed on the second body, the limiting mechanism being configured to: when the second split body stretches and retracts to a specific position relative to the first split body, the positioning mechanism is locked, and when the interaction force between the limiting mechanism and the positioning mechanism is larger than a threshold value, the limiting mechanism and the positioning mechanism are mutually released.

2. The telescoping mechanism bump guard of claim 1, wherein the limit mechanism comprises:

the limiting plate is arranged on the second split body, and a limiting groove is formed in one surface, facing the positioning mechanism, of the limiting plate;

when the second sub-body stretches to a specific position relative to the first sub-body, the positioning mechanism is clamped into the limiting groove, and the positioning mechanism is separated from the limiting groove when the interaction force between the limiting groove and the positioning mechanism is greater than the threshold value.

3. The telescoping mechanism bump guard of claim 2, wherein the positioning mechanism comprises:

the positioning pin is arranged on the first split body;

when the second split body stretches to a specific position relative to the first split body, the positioning pin is clamped into the limiting groove towards one end of the limiting plate, and when the interaction force of the limiting groove and the positioning pin is larger than the threshold value, the positioning pin is separated from the limiting groove.

4. The telescoping mechanism bump guard of claim 3,

the locating pin orientation the end of limiting plate has first inclined plane and facade, first inclined plane orientation the retraction direction of second branch body, the facade orientation the extension direction of second branch body, first inclined plane is followed retraction direction orientation extension direction slope.

5. The telescoping mechanism bump guard of claim 3, wherein the positioning mechanism further comprises:

an elastic assembly through which the positioning pin is elastically connected to the first split body.

6. The telescoping mechanism bump guard of claim 5,

the second split body is provided with a step hole, and the positioning pin penetrates through the step hole from one side of the second split body to the other side of the second split body; the positioning mechanism further comprises a nut, an external thread is arranged on a pin body of the positioning pin, and the nut is screwed on the external thread of the part, penetrating out of the stepped hole, of the positioning pin;

the elastic assembly comprises a spring, the spring is sleeved on the pin body of the positioning pin, one end of the spring is connected with the pin body of the positioning pin, and the other end of the spring extends into the step hole and is mutually abutted to the step of the step hole.

7. The telescoping mechanism bump guard of claim 3,

one surface, facing the positioning mechanism, of the limiting plate is provided with at least one second inclined surface, and the second inclined surface is adjacent to the limiting groove; and one end of the positioning pin, which faces the limiting plate, is provided with a cambered surface.

8. The telescoping mechanism bump guard of claim 1,

the stop gear includes: the first boss is arranged on the second sub-body;

the positioning mechanism includes: the second boss is arranged on the first split body;

when the second sub-body extends to a specific position relative to the first sub-body, the first boss is clamped on a first side of the second boss, and the first side is the side, back to the retraction direction of the second sub-body, of the second boss.

9. A spreader, comprising:

a main beam;

the telescopic beam is telescopically arranged on the main beam; and

a telescopic mechanism collision avoidance device as claimed in any one of claims 1 to 8;

the positioning mechanism is installed on the main beam, and the limiting mechanism is installed on the telescopic beam.

10. The spreader of claim 9, further comprising:

the telescopic oil cylinder comprises a cylinder body and an oil rod, wherein the cylinder body is installed on the main beam, and the oil rod is linked with the telescopic beam.

11. The spreader of claim 10, wherein the telescopic cylinder comprises:

the hydraulic reversing valve adopts a hydraulic reversing valve with Y-shaped function.