阅读说明：本技术 一种抗侧向力的油缸 (Lateral force resistant oil cylinder ) 是由 洪建军 张小波 李秀珍 雷建红 郭绍波 熊俊 王辉 夏成强 于 2021-09-18 设计创作，主要内容包括：本申请涉及一种抗侧向力的油缸,涉及机械工程技术领域,其包括外套筒、活塞组件和锁止机构,活塞组件连接于外套筒内,并开设有第一油腔和第二油腔；锁止机构包括内套筒和锁舌,内套筒套设于活塞组件外,且其一端滑设于活塞组件上,并与活塞组件之间形成有与第一油腔；锁舌一端与内套筒的另一端连接,并与活塞组件之间形成有第二通道,另一端为用于承载侧向力的承载面；该油缸具有伸出状态和缩回状态,当处于伸出状态时,第二油腔内注入压力油,并通入第二通道内,锁舌在压力油的推动下,朝远离活塞组件的方向运动；当处于缩回状态时,第一油腔内注入压力油,并通入第一通道内,内套筒在压力油的推动下,带动锁舌朝靠近活塞组件的方向运动。(The application relates to an oil cylinder resisting lateral force, which relates to the technical field of mechanical engineering and comprises an outer sleeve, a piston assembly and a locking mechanism, wherein the piston assembly is connected in the outer sleeve and is provided with a first oil cavity and a second oil cavity; the locking mechanism comprises an inner sleeve and a lock tongue, the inner sleeve is sleeved outside the piston assembly, one end of the inner sleeve is slidably arranged on the piston assembly, and a first oil cavity is formed between the inner sleeve and the piston assembly; one end of the lock tongue is connected with the other end of the inner sleeve, a second channel is formed between the lock tongue and the piston assembly, and the other end of the lock tongue is a bearing surface for bearing lateral force; the oil cylinder has an extending state and a retracting state, when the oil cylinder is in the extending state, pressure oil is filled in the second oil cavity and is introduced into the second channel, and the lock tongue moves towards the direction far away from the piston assembly under the pushing of the pressure oil; when the piston assembly is in a retracting state, pressure oil is injected into the first oil cavity and is introduced into the first channel, and the inner sleeve drives the spring bolt to move towards the direction close to the piston assembly under the pushing of the pressure oil.)

1. The utility model provides an anti lateral force's hydro-cylinder which characterized in that, it includes:

an outer sleeve (1);

a piston assembly (2) connected within the outer sleeve (1); a first oil chamber (20) and a second oil chamber (21) are formed in the piston assembly (2);

a locking mechanism (3) comprising:

-an inner sleeve (30) sleeved outside the piston assembly (2), one end of the inner sleeve being slidably disposed on the piston assembly (2), and a first passage (31) being formed between the inner sleeve and the piston assembly (2), the first passage (31) being communicated with the first oil chamber (20);

-a locking tongue (32) having one end connected to the other end of the inner sleeve (30) and forming a second channel (33) communicating with the second oil chamber (21) with the piston assembly (2), the other end being a bearing surface (34) for bearing lateral forces;

the oil cylinder has an extending state and a retracting state, when the oil cylinder is in the extending state, pressure oil is filled in the second oil cavity (21) and is communicated into the second channel (33), and the lock tongue (32) moves towards the direction far away from the piston assembly (2) under the pushing of the pressure oil; when the piston assembly is in a retraction state, pressure oil is injected into the first oil chamber (20) and is introduced into the first channel (31), and the inner sleeve (30) drives the bolt (32) to move towards the direction close to the piston assembly (2) under the pushing of the pressure oil.

2. A lateral force resistant cylinder according to claim 1, characterized in that it further comprises a positioning means (4), said positioning means (4) being provided on the inner wall of said outer sleeve (1), said locking means (3) being in abutment with said outer sleeve (1) through said positioning means (4).

3. A cylinder resistant to lateral forces according to claim 2, characterized in that said positioning means (4) comprise:

the positioning piece (40) is arranged at one end, far away from the piston assembly (2), of the outer sleeve (1) along the inner circumferential direction of the outer sleeve (1);

a support (41) which is arranged in the middle of the outer sleeve (1) along the inner circumferential direction of the outer sleeve (1), and the length of the support (41) is not less than the maximum stroke of the locking mechanism (3).

4. A lateral force resistant cylinder as claimed in claim 3, wherein:

the inner wall of the outer sleeve (1) is provided with a plurality of grooves (10) which are arranged at intervals along the axial direction;

the support piece (41) comprises a plurality of support rings (410), each support ring (410) corresponds to one groove (10), the support rings (410) are arranged in the grooves (10), and the locking mechanism (3) abuts against the support rings (410).

5. A lateral force resistant cylinder according to claim 1, wherein said piston assembly (2) comprises:

a piston rod (22) having one end connected to the outer sleeve (1);

a piston (23) connected to the other end of the piston rod (22), the piston (23) having a diameter larger than that of the piston rod (22); the inner sleeve (30) is sleeved on the piston (23) and arranged on the piston rod (22) through a guide piece (35), and the inner sleeve (30), the guide piece (35), the piston rod (22) and the piston (23) jointly form the first channel (31).

6. The lateral force resistant cylinder of claim 1, wherein:

the first oil chamber (20) comprises a first section (200) and a second section (201) which are communicated with each other, the first section (200) and the second section (201) are respectively arranged along the axial direction and the radial direction of the piston assembly (2), and the second section (201) is communicated with the first channel (31);

the second oil chamber (21) is arranged along the axial direction of the piston assembly (2) and penetrates through the piston assembly (2).

7. The lateral force resistant cylinder of claim 1, wherein:

a first thread (36) and a second thread (37) are arranged on the bolt (32) at intervals along the axial direction of the bolt;

the locking mechanism (3) further comprises a nut (38), the nut (38) is matched with the first thread (36) and the second thread (37), and when the locking mechanism is in an extending state and a retracting state, the nut (38) is respectively screwed on the first thread (36) or the second thread (37) and abuts against the outer sleeve (1).

8. The oil cylinder for resisting the lateral force as claimed in claim 1, further comprising an anti-rotation mechanism (5), wherein the anti-rotation mechanism (5) is arranged on the locking bolt (32) and is used for preventing the locking bolt (32) from rotating.

9. The anti-lateral-force cylinder according to claim 8, wherein the anti-rotation mechanism (5) comprises:

a guide sleeve (50) arranged on the outer sleeve (1);

a guide rod (51) which is arranged along the axial direction of the outer sleeve (1) and is arranged in the guide sleeve (50) in a sliding manner;

and one end of the insertion rod (52) is connected with the guide rod (51), and the other end of the insertion rod is vertically inserted into the lock tongue (32).

10. The anti-roll cylinder according to claim 1, characterized in that the bearing surface (34) is a slope.

Technical Field

The application relates to the technical field of mechanical engineering, in particular to an anti-lateral-force oil cylinder.

Background

At present, a piston and a piston rod of the oil cylinder do high-speed reciprocating motion together, and simultaneously bear larger lateral force, so that the friction between the piston and the piston rod and the wall of the oil cylinder and a sealing structure is intensified, the external leakage of a hydraulic system is increased, the piston and the piston rod generate radial deformation, and the service life of the oil cylinder is influenced.

In the related art, the cylinder with a common structure has certain lateral force resistance capability through measures such as strengthening the sealing of the piston and the guide sleeve, increasing the wall thickness of the cylinder barrel and the like, but can only resist smaller lateral force and has larger limitation.

Disclosure of Invention

The embodiment of the application provides an anti-lateral-force oil cylinder, so that the problem that the oil cylinder with a common structure has certain anti-lateral-force capacity but can only resist smaller lateral force and has great limitation due to measures such as strengthening a piston and sealing a guide sleeve, increasing the wall thickness of a cylinder barrel and the like in the prior art is solved.

In a first aspect, a lateral force resistant cylinder is provided, which includes:

an outer sleeve;

a piston assembly connected within the outer sleeve; a first oil chamber and a second oil chamber are formed in the piston assembly;

a locking mechanism, comprising:

an inner sleeve sleeved outside the piston assembly, having one end slidably disposed on the piston assembly, and forming a first passage with the piston assembly, wherein the first passage is communicated with the first oil chamber;

a bolt, one end of which is connected with the other end of the inner sleeve and a second channel communicated with the second oil chamber is formed between the bolt and the piston assembly, and the other end of the bolt is a bearing surface for bearing lateral force;

the oil cylinder has an extending state and a retracting state, when the oil cylinder is in the extending state, pressure oil is filled in the second oil cavity and is introduced into the second channel, and the lock tongue moves towards the direction far away from the piston assembly under the pushing of the pressure oil; when the piston assembly is in a retracting state, pressure oil is injected into the first oil cavity and is introduced into the first channel, and the inner sleeve drives the spring bolt to move towards the direction close to the piston assembly under the pushing of the pressure oil.

In some embodiments, the cylinder further comprises a positioning mechanism, the positioning mechanism is arranged on the inner wall of the outer sleeve, and the locking mechanism is abutted with the outer sleeve through the positioning mechanism.

In some embodiments, the positioning mechanism comprises:

the positioning piece is arranged at one end of the outer sleeve, which is far away from the piston assembly, along the inner circumferential direction of the outer sleeve;

and the support piece is arranged in the middle of the outer sleeve along the inner circumferential direction of the outer sleeve, and the length of the support piece is not less than the maximum stroke of the locking mechanism.

In some embodiments:

the inner wall of the outer sleeve is provided with a plurality of grooves which are arranged at intervals along the axial direction of the outer sleeve;

the supporting piece comprises a plurality of supporting rings, each supporting ring corresponds to one groove, the supporting rings are arranged in the grooves, and the locking mechanism is abutted to the supporting rings.

In some embodiments, the piston assembly comprises:

a piston rod, one end of which is connected with the outer sleeve;

the piston is connected with the other end of the piston rod, and the diameter of the piston is larger than that of the piston rod; the inner sleeve is sleeved on the piston and arranged on the piston rod through a guide piece, and the inner sleeve, the guide piece, the piston rod and the piston form the first channel together.

In some embodiments:

the first oil chamber comprises a first section and a second section which are communicated with each other, the first section and the second section are respectively arranged along the axial direction and the radial direction of the piston assembly, and the second section is communicated with the first channel;

the second oil chamber is arranged along the axial direction of the piston assembly and penetrates through the piston assembly.

In some embodiments:

the lock tongue is provided with a first thread and a second thread at intervals along the axial direction;

the locking mechanism further comprises a nut, the nut is matched with the first thread and the second thread, and when the locking mechanism is in an extending state and a retracting state, the nut is in threaded connection with the first thread or the second thread respectively and abuts against the outer sleeve.

In some embodiments, the oil cylinder further comprises an anti-rotation mechanism, and the anti-rotation mechanism is arranged on the lock tongue and used for preventing the lock tongue from rotating.

In some embodiments, the anti-rotation mechanism comprises:

the guide sleeve is arranged on the outer sleeve;

the guide rod is arranged along the axial direction of the outer sleeve and is arranged in the guide sleeve in a sliding manner;

and one end of the inserting rod is connected with the guide rod, and the other end of the inserting rod is vertically inserted into the lock tongue.

In some embodiments, the bearing surface is a bevel.

The beneficial effect that technical scheme that this application provided brought includes: according to the embodiment of the application, the lock tongue and the inner sleeve are arranged, the radial component force generated by the lateral force is supported by the lock tongue and the inner sleeve, so that the piston assembly and the outer sleeve are free from the radial component force and radial deformation, pressure oil in the oil cylinder is prevented from leaking inwards and outwards, and the lateral force resistance of the oil cylinder is improved.

The embodiment of the application provides an anti-lateral-force oil cylinder, and after a lock tongue extends out to a certain stroke, a bearing surface of the lock tongue contacts with a load and pushes the load to continue to move, and the oil cylinder stops until a specified stroke is reached. In the process, the lateral force applied to the lock tongue by the load is decomposed into an axial component force and a radial component force, wherein the axial component force is supported by the piston assembly and the outer sleeve, and the radial component force is supported by the lock tongue and the inner sleeve.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic diagram illustrating a retracted state of a lateral force resisting cylinder according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram illustrating an extended state of a lateral force resisting cylinder according to an embodiment of the present disclosure;

FIG. 3 is a left side view of FIG. 2;

fig. 4 is a schematic structural view of an anti-rotation mechanism provided in the embodiment of the present application.

In the figure: 1. an outer sleeve; 10. a groove; 2. a piston assembly; 20. a first oil chamber; 200. a first stage; 201. a second stage; 21. a second oil chamber; 22. a piston rod; 23. a piston; 3. a locking mechanism; 30. an inner sleeve; 31. a first channel; 32. a latch bolt; 33. a second channel; 34. a bearing surface; 35. a guide member; 36. a first thread; 37. a second thread; 38. a nut; 4. a positioning mechanism; 40. a positioning member; 41. a support member; 410. a support ring; 5. an anti-rotation mechanism; 50. a guide sleeve; 51. a guide bar; 52. and (4) inserting the rod.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, 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 some embodiments of the present application, but not all 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.

Referring to fig. 1 and 2, the embodiment of the present application provides a lateral force resistant cylinder, which includes an outer sleeve 1, a piston assembly 2 and a locking mechanism 3, wherein the piston assembly 2 is connected in the outer sleeve 1; a first oil chamber 20 and a second oil chamber 21 are formed in the piston assembly 2; the locking mechanism 3 comprises an inner sleeve 30 and a locking bolt 32, the inner sleeve 30 is sleeved outside the piston assembly 2, one end of the inner sleeve is slidably arranged on the piston assembly 2, a first channel 31 is formed between the inner sleeve and the piston assembly 2, and the first channel 31 is communicated with the first oil chamber 20; one end of the bolt 32 is connected with the other end of the inner sleeve 30, a second channel 33 communicated with the second oil chamber 21 is formed between the bolt and the piston assembly 2, and the other end is a bearing surface 34 for bearing lateral force. The oil cylinder has an extending state and a retracting state, when the oil cylinder is in the extending state, pressure oil is filled in the second oil cavity 21 and is communicated into the second channel 33, and the lock tongue 32 moves towards the direction far away from the piston assembly 2 under the pushing of the pressure oil; when in the retracted state, the first oil chamber 20 is filled with pressure oil and is communicated into the first passage 31, and the inner sleeve 30 is pushed by the pressure oil to drive the latch 32 to move towards the direction close to the piston assembly 2.

The retraction process of the lateral force resistant oil cylinder of the embodiment of the application is as follows:

pressure oil is injected into the first oil chamber 20, the second oil chamber 21 is connected with oil, the pressure of the oil in the first oil chamber 20 is increased, high-pressure hydraulic oil is introduced into the first channel 31, force for pushing the piston assembly 2 and force for pushing the inner sleeve 30 leftwards are generated, the piston assembly 2 cannot move rightwards due to the fact that the left end of the piston assembly 2 is fixedly connected with the left end of the outer sleeve 1, the inner sleeve 30 drives the bolt 32 to move towards the direction close to the piston assembly 2 together under the pushing of the pressure oil, and the moving process is retraction movement of the oil cylinder resisting lateral force.

The lateral force resistant oil cylinder of the embodiment of the application has the following stretching process:

pressure oil is injected into the second oil chamber 21, the first oil chamber 20 is connected with oil, the pressure of the oil in the second oil chamber 21 is increased, high-pressure hydraulic oil is introduced into the second channel 33 to generate a force pushing the piston assembly 2 leftwards and a force pushing the bolt 32 rightwards, the piston assembly 2 cannot move leftwards as the left end of the piston assembly 2 is fixedly connected with the left end of the outer sleeve 1, the bolt 32 drives the inner sleeve 30 to move together in a direction far away from the piston assembly 2 under the pushing of the pressure oil, and the moving process is the extending movement of the oil cylinder resisting the lateral force.

The lateral force resisting oil cylinder provided by the embodiment of the application bears the lateral force in the extending process as follows:

after the bolt 32 extends to a certain stroke, the bearing surface 34 of the bolt 32 contacts the load and pushes the load to continue moving until the specified stroke is reached, and the oil cylinder stops. In the process, a lateral force applied to the lock tongue 32 by a load (the lateral force in the embodiment of the present application refers to an oblique force applied to the end face of the extending end of the oil cylinder by the load, and the oblique force forms a certain included angle with the axis of the oil cylinder), the lateral force is decomposed into an axial component and a radial component, wherein the axial component is supported by the piston assembly 2 and the outer sleeve 1, and the radial component is supported by the lock tongue 32 and the inner sleeve 30, so that the radial deformation of the piston assembly 2 and the outer sleeve 1 is as small as possible, and the pressure oil in the oil cylinder is ensured not to leak inwards or outwards.

Therefore, the locking tongue 32 and the inner sleeve 30 are arranged, the piston assembly 2 and the outer sleeve 1 are free from radial component force and radial deformation by means of the radial component force generated by the lateral force supported by the locking tongue 32 and the inner sleeve 30, pressure oil in the oil cylinder is prevented from leaking inwards and outwards, and the lateral force resistance of the oil cylinder is improved.

Optionally, referring to fig. 2, the oil cylinder further comprises a positioning mechanism 4, the positioning mechanism 4 is arranged on the inner wall of the outer sleeve 1, and the locking mechanism 3 is abutted with the outer sleeve 1 through the positioning mechanism 4.

The lateral force applied by the load to the lock tongue 32 is decomposed into an axial component force and a radial component force, wherein the axial component force is supported by the piston assembly 2 and the outer sleeve 1, and the radial component force is supported by the contact fit of the positioning mechanism 4 and the outer sleeve 1, so that the radial deformation of the lock tongue 32 and the inner sleeve 30 is as small as possible, the influence of the radial deformation on the piston assembly 2 and the outer sleeve 1 is small, and the oil cylinder is ensured not to leak inwards or outwards.

Preferably, referring to fig. 2, the positioning mechanism 4 comprises a positioning member 40 and a supporting member 41, wherein the positioning member 40 is arranged at one end of the outer sleeve 1 far away from the piston assembly 2 along the inner circumferential direction of the outer sleeve 1; the support 41 is provided in the middle of the outer sleeve 1 in the inner circumferential direction of the outer sleeve 1, and the length of the support 41 is not less than the maximum stroke of the locking mechanism 3.

The radial component force applied to the lock tongue 32 can cause the lock tongue 32 and the inner sleeve 30 to deform along the radial direction, that is, the lock tongue 32 and the inner sleeve 30 together form a lever structure, and the radial component force applied to the bearing surface 34 of the lock tongue 32 can cause the right end of the lever structure to tilt upwards and the left end to be pressed downwards; in this case, one of the fulcrums between the lever structure and the outer sleeve 1 is located at the rightmost end of the outer sleeve 1, and the other fulcrum is located in the middle of the outer sleeve 1, and the positions of the fulcrums are different according to the movement stroke of the oil cylinder. Therefore, the positioning member 40 is disposed at the position of the first fulcrum, the supporting member 41 is disposed at the position of the second fulcrum, and the length of the supporting member 41 is not less than the maximum stroke of the locking mechanism 3, so as to satisfy different extending strokes of different cylinders.

Then, the radial component force received by the lock tongue 32 is supported by the contact fit of the positioning piece 40 and the supporting piece 41 with the outer sleeve 1, so that the influence of the radial component force on the lock tongue 32 and the inner sleeve 30 is reduced, the radial deformation of the lock tongue 32 and the inner sleeve 30 is minimized, and the service life of the oil cylinder is prolonged.

The positioning piece 40 is made of high-strength materials, the wear resistance is good, the use times are multiple, meanwhile, the positioning piece 40 is designed to be of a structure which can be separated from the outer sleeve 1, and after the positioning piece 40 is worn after being used for a long time, only the positioning piece 40 can be replaced without being integrally replaced.

The supporting piece 41 is made of a composite material, the wear resistance is good, a lubricating oil nozzle is designed near the supporting ring 410 for prolonging the service life of the oil cylinder, and lubricating grease can be injected into the supporting ring 410 through the lubricating oil nozzle for lubrication.

Furthermore, the inner wall of the outer sleeve 1 is provided with a plurality of grooves 10 which are arranged at intervals along the axial direction; the support 41 includes a plurality of support rings 410, each support ring 410 corresponds to one of the grooves 10, the support rings 410 are disposed in the grooves 10, and the locking mechanism 3 abuts against the support rings 410.

Because the length of support piece 41 is not less than the maximum stroke of locking mechanism 3, in order to realize the great span of support piece 41, support piece 41 is unfavorable for machine-shaping as a whole, and is unfavorable for the change, consequently, this application embodiment makes into a plurality of support rings 410 with support piece 41, locates in a plurality of recesses 10 respectively, makes things convenient for support piece 41's processing and change.

Further, referring to fig. 1, the piston assembly 2 comprises a piston rod 22 and a piston 23, wherein one end of the piston rod 22 is connected with the outer sleeve 1; the piston 23 is connected with the other end of the piston rod 22, and the diameter of the piston 23 is larger than that of the piston rod 22; the inner sleeve 30 is sleeved on the piston 23 and is disposed on the piston rod 22 through the guide 35, and the inner sleeve 30, the guide 35, the piston rod 22 and the piston 23 together form the first passage 31.

Through structural design, the piston rod 22 and the piston 23 are fixed, the inner sleeve 30 and the lock tongue 32 move, meanwhile, because the inner sleeve 30 and the lock tongue 32 bear radial component force, the guide piece 35 and the piston 23 which affect the tightness of the oil cylinder are far away from a bearing position, the radial deformation of the guide piece 35 and the piston 23 is ensured to be very small, the oil cylinder can normally run under the condition of bearing large lateral force, and inner leakage and outer leakage do not occur.

Further, referring to fig. 1 and 3, the first oil chamber 20 includes a first section 200 and a second section 201 which are communicated with each other, the first section 200 and the second section 201 are respectively disposed along an axial direction and a radial direction of the piston assembly 2, and the second section 201 is communicated with the first passage 31, and the second section 201 is disposed on the piston rod 22 and disposed near the piston; the second oil chamber 21 is provided in the axial direction of the piston assembly 2, and penetrates the piston assembly 2.

First oil pocket 20 is for having the pole chamber, and second oil pocket 21 is no pole chamber, and for the security that improves the hydro-cylinder, first oil pocket 20 and second oil pocket 21 all design to the left end face of immovable piston rod 22, can the direct mount safety valve piece, have avoided because of the hydraulic fluid port motion needs the hose directly to lead to the hose to break the safety risk that produces.

Furthermore, the bolt 32 is provided with a first thread 36 and a second thread 37 at intervals along the axial direction; the locking mechanism 3 further comprises a nut 38, the nut 38 is adapted to the first thread 36 and the second thread 37, and when in the extended state and the retracted state, the nut 38 is screwed on the first thread 36 or the second thread 37, respectively, and abuts against the outer sleeve 1.

The first thread 36 of the embodiment of the application is positioned at the left side of the second thread 37, and when the oil cylinder is in an extending state, the nut 38 is screwed on the first thread 36; when the cylinder is in the retracted state, the nut 38 is screwed on the second screw thread 37.

When the oil cylinder is in an extending state, in order to avoid the safety risk caused by the fact that the stroke of the oil cylinder automatically returns due to leakage in the oil cylinder under the long-term bearing state of the oil cylinder and the load cannot be reliably attached. After the cylinder extends to a specified stroke, the nut 38 is rotated to the first thread 36, and the nut 38 is screwed until the nut abuts against the right end face of the outer sleeve 1, so that the lock tongue 32 is reliably positioned.

The unlocking process of the oil cylinder resisting the lateral force is as follows: due to the long duration of load on the bearing surface 34 of the bolt 32, the nut 38 is subjected to a significant load and may not be able to unscrew properly. Pressure oil is injected into the second oil chamber 21, the first oil chamber 20 is connected with oil, after the bolt 32 extends out for 1-2mm, the nut 38 moves rightwards along with the bolt 32 and is separated from the right end face of the outer sleeve 1, and then the nut 38 is screwed out by using a special tool.

Optionally, referring to fig. 4, the oil cylinder further includes an anti-rotation mechanism 5, where the anti-rotation mechanism 5 is disposed on the lock tongue 32 and is used to prevent the lock tongue 32 from rotating.

When the lock tongue 32 contacts the load, since the bearing surface 34 of the lock tongue 32 is an inclined surface, the inclined surface cannot be well attached to and contacted with the load after the lock tongue 32 rotates, and safety risk is generated. For this reason, the rotation prevention mechanism 5 is designed to ensure that the latch tongue 32 does not rotate.

Preferably, as shown in fig. 4, the rotation-preventing mechanism 5 comprises a guide sleeve 50, a guide rod 51 and an insertion rod 52, wherein the guide sleeve 50 is arranged on the outer sleeve 1; the guide rod 51 is arranged along the axial direction of the outer sleeve 1 and is arranged in the guide sleeve 50 in a sliding way; one end of the insertion rod 52 is connected with the guide rod 51, and the other end is vertically inserted into the latch tongue 32.

The guide rod 51 and the insert rod 52 make telescopic movement together with the latch bolt 32, and the insert rod 52 is inserted into the latch bolt 32 in a radial direction to prevent the latch bolt 32 from rotating.

Preferably, the bearing surface 34 is a bevel.

The inclined plane angle of the bearing surface 34 of the bolt 32 is certain, so that reliable fit with a load is ensured;

in the embodiment of the application, in the process of extending and retracting the oil cylinder, air between the outer sleeve 1 and the guide piece 35 is repeatedly extruded and sucked to be empty, certain compressed air or negative pressure is formed, and the in-place precision of the oil cylinder is influenced. For this purpose, a venting plug is provided, by means of which the normal circulation of air in the space is ensured.

In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.