WO2023061503A1

WO2023061503A1 - Telescopic coupler locking device

Info

Publication number: WO2023061503A1
Application number: PCT/CN2022/125547
Authority: WO
Inventors: 王广超; 刘辉; 王晓鹏
Original assignee: 中车制动系统有限公司
Priority date: 2022-05-31
Filing date: 2022-10-17
Publication date: 2023-04-20
Also published as: CN114802336A; CN114802336B

Abstract

The application provides a telescopic coupler locking device, comprising: a housing, which can be connected to one end of a telescopic coupler; a traction rod: which can be connected to the other end of the telescopic coupler, and at least one locking slot is formed on a side wall; a telescopic assembly: a fixed end is connected inside the housing, and a telescopic end is connected to a traction rod; a locking ring: which is sleeved on the inner side of an open end of the housing; at least one locking block assembly: which is installed on the locking ring and can move in a telescopic manner in the radial direction of the housing. The number of the locking slot corresponds to the number of the locking block assembly. When the traction rod retracts into the housing, the locking block assembly can be inserted into the locking slot to limit the extending motion of the traction rod.

Description

Telescopic coupler locking device

This application claims the priority of the Chinese patent application with the application number 202210614567.2 and the application name "Telescopic Coupler Locking Device" submitted to the China Patent Office on May 31, 2022, the entire contents of which are incorporated in this application by reference.

technical field

The present application relates to the technical field of train couplers, in particular to a telescopic coupler locking device.

Background technique

As a key component of the train coupler, the telescopic device can ensure that the coupler is in an extended state when it is connected to the hook, and is in a retracted state when it does not need to be connected to run, saving the space at the front end of the train.

In order to ensure that the coupler can maintain the current state after it is extended or retracted, the telescopic device is required to have a reliable locking mechanism, and it needs to have the functions of extension locking and retraction locking. At present, the locking methods of the coupler telescopic device mainly include the following methods: (1) the pin type, which has a simple structure, but the force cross-sectional area is small; (2) the block type, which has a relatively simple structure, but the contact surface is two radii Different arc surfaces, so the contact surface is easy to wear and deform after a long time; (3) spline type.

The Chinese patent application CN108839668A proposes a coupler telescopic device and a coupler, wherein the coupler telescopic device includes a casing, and a drawbar that can expand and contract along the casing. The inside of the casing is provided with a locking ring that can be in contact with the limit block. The locking ring is coaxial with the casing, and the locking ring is rotatably connected to the casing. The shape of the groove corresponds to the limit block, so that when the through slot and the limit block are aligned, the limit block passes through the through slot, and then when the drawbar is extended, the rotation of the locking ring realizes the limit Block blocking, complete the extended locking of the tow bar.

However, the retraction lock of the above-mentioned coupler telescopic device adopts a bolt type, the force bearing area is small, the number is single, and the retraction lock is unreliable.

Contents of the invention

The purpose of the present application is to solve one of the above-mentioned technical problems, and to provide a novel telescopic coupler locking device.

In order to achieve the above purpose, an embodiment of the present application provides a telescopic coupler locking device, including:

housing: including an open end, the end opposite the open end being connectable to an end of the telescoping coupler;

Tow bar: can be connected to the other end of the telescopic coupler, the side wall of the tow bar is provided with at least one lock slot;

Telescopic assembly: including a fixed end and a telescopic end, the fixed end is connected to the casing, the telescopic end is connected to the drawbar, and can be stretched out through the open end of the casing; the telescopic movement of the telescopic assembly can retract the drawbar into the space of the casing, or push out of the housing;

Locking ring: set inside the open end of the shell;

At least one set of locking block components: installed on the locking ring, including elastic parts, which can expand and contract toward the radial direction of the housing;

The number of lock slots corresponds to the number of lock block assemblies. When the drawbar is retracted into the housing, the lock block assemblies can be inserted into the lock slots to limit the stretching movement of the drawbar.

In some embodiments of the present application, the lock block assembly includes:

Elastic part: installed on the locking ring, it can expand and contract towards the radial direction of the housing;

Locking block: installed on the telescopic end of the elastic piece;

The length of the elastic member is configured to be in a compressed state when in contact with the outer wall of the draw bar; the size of the locking block is configured to be inserted into the lock slot, and the movement along the axial direction of the draw bar is restricted by the lock slot.

In some embodiments of the present application, the locking block assembly further includes a mounting block mounted on the locking ring, and the elastic member is mounted on the mounting block.

In some embodiments of the present application, the mounting block includes a main body of the mounting block and a protruding portion of the mounting block that protrudes relative to the main body of the mounting block, and the elastic member is installed on the protruding portion of the mounting block; a through hole is provided on the locking ring, and the through hole A first stepped structure is provided on a side close to the outer periphery of the housing, the protruding part can pass through the gap between the first stepped structures, and the main body of the mounting block is installed on the first stepped structure.

In some embodiments of the present application, a second step structure is provided on the side of the through hole close to the inner periphery of the housing, and the outer periphery of the locking block includes a locking block protrusion, and the locking block protrusion is stuck at the second step structure to limit the locking block. Comes out through the through hole.

In some embodiments of the present application, the head of the locking block is provided with a wear pad.

In some embodiments of the present application, along the circumferential direction of the drawbar, the locking groove is in the shape of an arc concave from both sides to the middle.

In some embodiments of the present application, several first radially protruding blocks are arranged at intervals along the inner peripheral wall of the locking ring, and several second radially protruding blocks are arranged at intervals along the outer wall of the draw bar, and the second radially protruding blocks are relatively opposite to the locking ring. The slot is located on one side close to the housing; the gap between any two first radially protruding pieces can allow the passage of the second radially protruding piece, and the first radially protruding piece is opposite to the second radially protruding piece , the retraction of the drawbar to the housing is restricted.

In some embodiments of the present application, the locking block assembly is arranged at the first radially protruding block, and the locking groove is arranged on the extension line of the second radially protruding block.

In some embodiments of the present application, a handle is provided on the outer wall of the locking ring, and a handle hole extending along the circumferential direction of the housing is provided at the open end of the housing. The handle passes through the handle hole, and the circumferential length of the handle hole is configured as follows: Rotate the first radial protruding block to the gap between two adjacent second radial protruding blocks opposite to it, or rotate to make the first radial protruding block opposite to the second radial protruding block .

The telescopic coupler locking device provided by the application has the beneficial effects of:

1. In the telescopic coupler locking device provided by at least one embodiment of the present application, the lock block assembly is set to cooperate with the lock groove, and the retraction locking of the drawbar is realized by the cooperation of the locking ring and the drawbar itself during the movement process , simplifies the structure, increases the stress area, and improves the reliability of retraction locking.

2. In the telescopic coupler locking device provided by at least one embodiment of the present application, the lock block assembly and the first radially protruding block are arranged on the locking ring, and the second radially protruding block is arranged on the outer wall of the drawbar, Compared with the existing telescopic mechanism, it avoids the complexity of using different locking mechanisms for multiple parts of the same telescopic device, simplifies the internal and external structures of the housing, and is conducive to setting the external driving structure inside the housing, thereby The occupied space is reduced, and the weight of the coupler is greatly reduced at the same time.

3. The telescopic coupler locking device provided by at least one embodiment of the present application can simultaneously realize the locking function of the drawing rod in the extended and retracted states by rotating the locking ring. The locking ring and the drawing rod form a spline-type locking mechanism for It bears a larger bearing force when extended and locked, while the lock block assembly and the slot form a latch-type locking mechanism, which has a simple structure and is used to withstand a smaller bearing force when retracted and locked. Therefore, the coupler telescopic device of this application further simplifies Compared with the existing telescopic mechanism, the structure simplifies the locking operation of the locking device and improves the telescopic efficiency of the coupler.

4. In the telescopic coupler locking device provided by at least one embodiment of the present application, when the drawbar needs to be extended, the locking ring can be rotated to ensure the synchronization between unlocking the retracted locking state of the drawbar and the state that the drawbar can meet the extension requirement. The effectiveness of the movement of the telescopic mechanism of the coupler is improved.

Additional features and advantages of the application will be set forth in the description which follows, and, in part, will be obvious from the description, or may be learned by practice of the application. The objectives and other advantages of the application will be realized and attained by the structure pointed out in the written description and drawings.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the accompanying drawings that need to be used in the descriptions of the embodiments or the prior art will be briefly introduced below. Obviously, the accompanying drawings in the following description are only for the present application For some embodiments, those of ordinary skill in the art can also obtain other drawings based on these drawings without paying creative efforts.

Fig. 1 is the exploded view of the telescopic coupler locking device of the embodiment of the present application;

Figure 2 is an exploded view of the drawbar and locking ring of the telescopic coupler locking device of the embodiment of the present application;

Fig. 3 is the structural representation of the draw bar of the embodiment of the present application;

Fig. 4 is a schematic structural diagram of a locking ring according to an embodiment of the present application;

Figure 5 is an exploded view of the lock block assembly of the embodiment of the present application;

Fig. 6 is a cross-sectional view of the locking state of the telescopic coupler locking device according to the embodiment of the present application after the drawbar shrinks;

Fig. 7 is a partial enlarged view of the locking block assembly in Fig. 6;

Fig. 8a is a schematic diagram of the internal structure of the telescopic coupler locking device of the embodiment of the present application in the unlocked state after the retraction of the drawbar;

Fig. 8b is a schematic diagram of the internal structure of the telescopic coupler locking device of the embodiment of the present application when the drawbar is retracted and locked;

Fig. 9a is a schematic diagram of the external structure of the telescopic coupler locking device according to the embodiment of the present application, in which the drawbar is retracted and unlocked;

Fig. 9b is a schematic diagram of the external structure of the telescopic coupler locking device according to the embodiment of the present application when the drawbar is retracted and locked.

Fig. 10 is a schematic diagram of the internal structure of the drawbar of the telescopic coupler locking device of the embodiment of the present application during the extension process;

Fig. 11a is a schematic diagram of the external structure of the locking device of the telescopic coupler according to the embodiment of the present application in the unlocked state after the drawbar is stretched out;

Fig. 11b is a schematic diagram of the external structure of the telescopic coupler locking device of the embodiment of the present application after the drawbar is stretched out and locked;

1-shell, 101-open end, 102-handle hole;

2-drawing rod, 201-lock groove, 202-the second radially protruding block;

3-locking ring, 301-through hole, 3011-first step structure, 3012-second step structure, 3013-threaded hole, 302-first radial protruding block, 3021-clearance groove, 303-handle installation hole;

4-telescopic assembly, 41-fixed end; 42-telescopic end; 401-telescopic cylinder;

5-lock block assembly, 501-elastic piece, 502-lock block, 5021-lock block protrusion, 5022-lock block main body, 503-installation block, 5031-installation block main body, 5032-installation block protrusion ; 504-abrasion pad, 505-fixing piece;

6-handle.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application. Furthermore, it is to be understood that elements, structures and characteristics of one embodiment may be beneficially incorporated in other embodiments without further recitation.

In the description of this application, it should be noted that: the fixed connection described in this application can be a detachable fixed connection, or an integrated fixed connection; the orientation or position indicated by the terms "axial" and "radial" The relationship is based on the positional relationship shown in the drawings, and is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood To limit the present application; the terms "first" and "second" are used for descriptive purposes only, and should not be understood as indicating or implying relative importance.

The embodiment of the present application provides a locking device for a telescopic coupler, which can be used for locking the extended state and the retracted state of the telescopic coupler.

The structure of the locking device includes a housing 1, a towing rod 2, a telescopic assembly 4, a locking ring 3 and a locking block assembly 5, and its exploded structure refers to Fig. 1 and Fig. 2 .

Housing 1: including an open end 101, the end opposite to the open end 101 can be connected to one end of the telescopic coupler; the end of the housing 1 opposite to the open end 101 can also be designed as an open structure, on which a Closed components facilitate device installation and maintenance. The “end opposite to the open end 101 ” mentioned here refers to the other end of the casing 1 away from the open end 101 .

Drawbar 2: as shown in FIG. 3 , it can be connected to the other end of the telescopic coupler. At least one lock slot 201 is provided on the side wall of the drawbar 2 . Specifically, the two ends of the drawbar 2 are respectively a first end and a second end, wherein the first end is sleeved inside the casing 1 and is restricted in the casing 1 without falling out of the casing 1, and the second end is connected to the casing 1. The other end of the telescopic coupler is connected and can extend or retract from the housing 1 relative to the open end 101 .

Telescopic component 4: It includes a fixed end 41 and a telescopic end 42 that can be extended or retracted relative to the fixed end 41. The fixed end is connected and arranged in the housing 1, and the telescopic end 42 is connected to the traction rod 2, which can pass through the housing 1 The opening end 101 of the telescopic assembly 4 stretches out; the telescopic movement of the telescopic assembly 4 can retract the drawbar 2 into the space of the housing 1, or push it out of the housing 1; this telescopic movement controls the expansion and contraction of the telescopic coupler. The telescopic cylinder 401 is used in this embodiment; besides the telescopic cylinder, telescopic electric cylinders or other types of telescopic driving structures can also be used.

Locking ring 3: Referring to Fig. 4 for structure, it is set inside the opening end 101 of the housing, forming a non-fixed connection structure with the housing 1; in this embodiment, the housing 1 is cylindrical, and the locking ring 3 is Ring-shaped, the outer diameter of the locking ring 3 is slightly smaller than the inner diameter of the open end 101 of the housing 1, and the two form a sleeve connection structure. The locking ring 3 can rotate in the circumferential direction relative to the inner surface of the opening end 101, but the position of the locking ring 3 in the axial direction of the housing 1 is fixed; It is realized in cooperation with the radial dimension of the locking ring 3, and will not be described in detail here. In addition, it can be understood that the locking ring 3 is sleeved on the outside of the drawbar 2 .

At least one set of locking block assemblies 5: installed on the locking ring 3, can expand and contract toward the radial direction of the housing 1;

The number of locking slots 201 corresponds to the number of locking block assemblies 5 , and the positions of the locking slots 201 are configured such that when the drawbar 2 is retracted into the housing 1 , the locking block assemblies 5 can be inserted into the locking slots 201 . In this embodiment, as shown in Figure 6, the number of lock grooves 201 is two, which are arranged symmetrically. The lock block assembly 5 includes two groups, and its position on the lock ring 3 corresponds to the position of the lock groove 201, so as to ensure It can be smoothly inserted into the lock groove 201, so that the contact area and force value of the lock block assembly 5 and the lock groove 201 can be improved without affecting the normal expansion and contraction of the draw bar 2, thereby improving the impact of the lock block assembly 5 on the draw bar. 2 Locking stability. In addition to two, other numbers of lock grooves 201 and the matching structure of the lock block assembly 5 can also be selected according to needs.

With the above structure, after the drawbar 2 is retracted into the housing 1, by rotating the locking ring 3, the lock block assembly 5 can be inserted into the lock groove 201, the axial movement of the drawbar 2 is restricted, and the retracted state is locked. When unlocking is required, the locking ring 3 is rotated to make the lock block assembly 5 escape from the lock groove 201 to complete the unlocking.

In the above embodiments, the setting of the locking block assembly 5 to be expandable in the radial direction of the housing 1 can be understood as: the locking block assembly 5 protrudes relative to the inner surface of the locking ring 3 in a natural state without external force, and The locking block assembly 5 can be compressed to be flush with the inner surface of the locking ring 3 under the action of external force. During the retraction process of the drawbar 2 into the housing 1, the locking block assembly 5 is retracted into the locking ring 3 under the pressing action of the outer wall of the drawbar 2 without affecting the retraction movement of the drawbar 2, and, when After the drawbar 2 is retracted, when the lock groove 201 on the lock ring 3 is turned to face the lock block assembly 5, the external force disappears, and the lock block assembly 5 returns to its natural state and is inserted into the lock groove 201 to realize the retraction of the drawbar 2. lock back. When it needs to be unlocked, it is only necessary to turn the locking ring 3 again so that the locking block assembly 5 and the locking groove 201 are misaligned, and the locking block assembly 5 is retracted into the locking ring 3 again under the extrusion effect of the outer wall of the traction rod 2, which has a great impact on the traction. The locking effect of lever 2 disappears.

The simplest implementation structure of the lock block assembly 5 is to adopt a locking piece with certain elasticity and rigidity. In order to achieve a more stable locking effect, in some embodiments of the present application, as shown in Figure 1, Figure 2 and Figure 5, the lock block assembly 5 includes:

Elastic member 501: installed on the locking ring 3, it can expand and contract in the radial direction of the housing 1; specifically, one end of the elastic member 501 is installed on the locking ring 3, and its other end faces the center of the locking ring 3 and can be locked along the The ring 3 expands and contracts in the radial direction to form a telescopic end;

Locking block 502: installed on the telescopic end of the elastic member 501;

The length of the elastic member 501 is configured to be in a compressed state when in contact with the outer wall of the draw bar 2 ; the size of the locking block 502 is configured to be inserted into the lock slot 201 and restricted from moving along the axial direction of the draw bar 2 by the lock slot 201 .

Furthermore, in order to solve the problem of installation and maintenance of the lock block assembly 5 , in some embodiments of the present application, the lock block assembly 5 further includes a mounting block 503 mounted on the locking ring 3 , and the elastic member 501 is mounted on the mounting block 503 . The mounting block 503 is detachably installed on the locking ring 3, and the locking block assembly 5 can be regularly maintained by disassembling.

In order to solve the problem of installation between the components of the lock block assembly 5, as shown in FIG. 7, in some embodiments of the present application, the installation block 503 includes a main body portion 5031 of the installation block and a protrusion of the installation block protruding relative to the main body portion 5031 of the installation block. part 5032 , the elastic member 501 is installed on the protruding part 5032 of the mounting block. Specifically, the elastic member 501 can be a spring, and the protruding part 5032 of the mounting block is formed as a protruding post, and the spring is sleeved on the protruding post.

2 and 4, the locking ring 3 is provided with a through hole 301, and the side of the through hole 301 close to the outer circumference of the housing 1 is oppositely provided with a first stepped structure 3011, and the mounting block protrusion 5032 can pass through the first stepped structure 3011 The gap between them is penetrated, the first step structure 3011 is provided with a threaded hole 3013, and the main body part 5031 of the installation block is installed on the first step structure 3011 through the fixing piece 505, so as to solve the problem between the lock block assembly 5 and the lock ring 3 between fixed issues.

In some embodiments of the present application, the side of the through hole 301 close to the inner circumference of the housing 1 is oppositely provided with a second stepped structure 3012, and a gap space is formed between the first stepped structure 3011 and the second stepped structure 3012; as shown in Fig. 5 and Fig. As shown in FIG. 7 , the outer periphery of the locking block 502 includes a locking block protrusion 5021 , and the locking block protrusion 5021 is stuck at the second step structure 3012 to restrict the locking block 502 from coming out through the through hole 301 . The elastic member 501 is limited in the gap between the first stepped structure 3011 and the second stepped structure 3012 .

The locking block 502 also includes a locking block body part 5022. The locking block body part 5022 can pass between the second stepped structures 3012 and protrude from the inner surface of the locking ring 3. When the locking block assembly 5 faces the locking groove 201, the locking block The top end of the main body 5022 can be inserted into the lock groove 201 to form a locking effect.

In addition, in the above embodiments, the "side of the through hole 301 close to the outer circumference of the housing 1" refers to the side of the through hole 301 located on the outside in the radial direction of the housing 1, and the "side close to the inner circumference of the housing 1 “One side of the circumference” refers to the side on the inner side of the through hole 301 in the radial direction of the housing 1 .

Wherein, both the first stepped structure 3011 and the second stepped structure 3012 can be realized by the following structure: it can be two parts of stepped blocks arranged opposite to each other on the inner peripheral wall of the through hole 301, or it can be a circumferential radial convex block arranged along the inner peripheral wall of the through hole. step out.

During the expansion and contraction process of the drawbar 2, friction will be generated with the locking block 502. In order to improve the service life, the locking block 502 can be made of wear-resistant materials. Meanwhile, in order to solve this problem, in some embodiments of the present application, the head of the locking block 502 is provided with a wearing pad 504, and the wearing pad 504 is made of a wear-resistant material.

In some embodiments of the present application, as shown in FIG. 3 , along the circumferential direction of the drawbar 2 , the locking groove 201 is in the shape of an arc concave from both sides to the middle, so that during the process of rotating the locking ring 3 , When the drawbar 2 needs to be unlocked or locked, the locking ring 3 is rotated, and the locking block 502 can be smoothly slid into the lock along the arc-shaped surface of one side during the process of the locking block 502 coming out from both sides of the locking groove 201. Slot 201 or slide out of lock slot 201.

In some embodiments of the present application, as shown in FIGS. 2-4 , several first radial projections 302 are arranged at intervals along the inner peripheral wall of the locking ring 3 , and several second radial projections are arranged at intervals along the outer wall of the draw bar 2 . Block 202, the second radially protruding block 202 is located on the side close to the housing 1 relative to the lock groove 201; the gap between any two first radially protruding blocks 302 can allow the second radially protruding block 202 By means of this, when the first radially protruding block 302 is opposite to the second radially protruding block 202 , the retraction movement of the drawbar 2 to the casing is restricted, and the drawbar 2 is in a state of extending and locking.

The first radially protruding blocks 302 are of equal size and arranged in equal intervals, the second radially protruding blocks 202 are of equal size and are arranged in equal intervals, gap grooves 3021 are formed between the first radially protruding blocks 302, and The gap groove 3021 between adjacent first radially protruding pieces 302 allows the second radially protruding pieces 202 to pass through, and the gap between adjacent second radially protruding pieces 202 allows the first radially protruding pieces 302 to pass through. through. When the drawbar 2 needs to stretch out from the housing, turn the locking ring 3 so that the gap between the second radially protruding block 202 and the first radially protruding block 302 is opposite, and push out the drawbar 2 to the outside of the housing; After being in place, turn the locking ring 3 so that the first radially protruding block 302 and the second radially protruding block 202 face each other, and the retraction movement of the draw bar 2 is locked and restricted.

In some embodiments of the present application, the lock block assembly 5 is arranged at the first radially protruding block 302, that is, the through hole 301 is opened on the first radially protruding block 302, and the corresponding lock block assembly 5 is also installed at the first radially protruding block 302. At one radially protruding block 302 , correspondingly, the locking groove 201 is arranged on the extension line of the second radially protruding block 202 . The extension line refers to the position of the second radially protruding block 202 as a reference, along the direction of the outer surface of the drawbar 2, extending in a direction away from the side of the housing 1, and is located on the outer surface of the side away from the housing 1 superior. Specifically, it means that the locking groove 201 and the second radially protruding block 202 are located on the outer surface of the draw bar 2 and that the locking groove 201 and the second radially protruding block 202 are located on the same axial direction of the draw bar 2 .

The lock block assembly 5 and the lock groove 201 cooperate with the position setting of the first radially protruding block 302 and the second radially protruding block 202 , so that the extension lock and the retraction lock cooperate. When it is necessary to retract and lock, first turn the locking ring 3 to stagger the gap between the two groups of protruding blocks, and then turn the locking ring 3 after the second radial protruding block 202 retracts to the inside of the first radial protruding block 302 , so that the lock block assembly 5 on the first radially protruding block 302 is rotated to enter the lock groove 201 . When it is necessary to extend the lock, turn the locking ring 3 so that the locking block 502 of the locking block assembly 5 slides out from one side of the locking groove 201, unlocking the pulling rod 2, and then the telescopic assembly 4 drives the pulling rod 2 from the housing 1 and the second radially protruding block 202 passes through the gap groove 3021 between the two first radially protruding blocks 302. When the draw bar 2 is stretched out in place, turn the locking ring 3 again so that the first radially protruding block 202 The protruding block 302 and the second radially protruding block 202 are opposite to each other in the axial direction of the draw bar 2 , and the retraction movement of the draw bar 2 is restricted by locking.

In some embodiments of the present application, the outer wall of the locking ring 3 is provided with a handle installation hole 303, the handle 6 is installed at the handle installation hole 303, and the open end 101 of the housing 1 is provided with a handle hole 102 extending along the circumferential direction of the housing 1 , the handle 6 passes through the handle hole 102, and the circumferential length of the handle hole 102 is configured to: the first radially protruding piece 302 can be rotated to the position of the two adjacent second radially protruding pieces 202 opposite to it. The gap can also be rotated to be opposite to the second radially protruding block 202 . The opposite mentioned here refers to the two second radially protruding blocks 202 closest to the first radially protruding block 302 in the axial extension direction of the draw bar 2 . By rotating the locking ring 3, the mating state of the first radially protruding block 302 and the second radially protruding block 202 is changed to complete locking and unlocking.

In some embodiments, in order to conveniently locate the position of the locking ring 3 and smoothly switch between locking and unlocking, the two ends of the handle hole 102 in the circumferential direction of the housing 1 are respectively the unlocking position and the locking position, and the unlocking position and the locking position meet the following conditions respectively: when the handle 6 is at the unlocking position of the handle hole 102, the position of the locking ring 3 is such that the first radially protruding block 302 faces two adjacent ones in the axial direction of the draw bar 2 The gap between the second radially protruding block 202 of the handle 202 realizes unlocking; when the handle 6 is rotated to the locking position of the handle hole 102, the position of the locking ring 3 is such that the first radially protruding block 302 is on the axis of the drawbar 2 Facing the second radially protruding block 202 upwards, the extension locking or retracting locking is realized.

The telescopic locking device provided by the present application has the following working principle.

1. Extend the lock

As shown in FIG. 8b and FIG. 9b , the drawbar 2 is in a fully retracted state, and the handle 6 is in the locking position of the handle hole 102 . At this time, the lock block assembly 5 is in the locking position, forming a latch type lock with the lock groove 201 .

Turn the handle 6 to drive the lock ring 3 to rotate, so that the lock block assembly 5 slides out of the lock groove 201, the handle 6 rotates to the unlocked position of the handle hole 102, and the drawbar 2 is at the unlocked position (as shown in Figure 8a and Figure 9a) . The telescopic cylinder 401 stretches out, driving the draw bar 2 to protrude from the housing 1, during which the second radially protruding block 202 smoothly passes through the gap groove 3021 between the first radially protruding blocks 302 of the locking ring 3 (See Fig. 10), when the drawbar 2 stretches out into place, as shown in Fig. 11a. Turning the handle 6 drives the locking ring 3 to rotate, and the handle 6 rotates to the locking position of the handle hole 102, so that the gap groove 3021 between the second radially protruding block 202 and the first radially protruding block 302 of the locking ring 3 is dislocated, The drawbar 2 cannot be retracted, and the extension and locking are completed. At this time, the state of the coupler telescopic device is shown in Figure 11b.

2. Retract lock

As shown in Figure 11b, the drawbar 2 is in a fully extended state, and the handle 6 is located at the locking position of the handle hole 102. At this time, the second radially protruding piece 202 is between the first radially protruding piece 302 of the locking ring 3. The clearance groove 3021 of the dislocation, the spline lock is formed between the locking ring 3 and the drawbar 2 .

Turning the handle 6 drives the locking ring to rotate. When the handle 6 is at the unlocking position of the handle hole 102 (as shown in FIG. The gap between them is centered, and the drawbar 2 is in the unlocked position at this time. The telescopic cylinder 401 is retracted, which drives the draw bar 2 to retract. During the process, the second radially protruding block 202 smoothly passes through the gap groove 3021 between the first radially protruding blocks 302 of the locking ring 3 (see FIG. 10 ), When the drawbar 2 is retracted to its original position, it is shown in Fig. 9a. Turn the handle 6 to drive the lock ring 3 to rotate, and the handle 6 is rotated to the locking position of the handle hole 102, so that the lock block assembly 5 slides into the lock groove 201. At this time, the drawbar 2 cannot be stretched out, and the retraction and locking are completed. At this time, the coupler telescopic device The state is shown in Figure 9b.

The above descriptions are only preferred embodiments of the application, and are not intended to limit the application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the application should be included in the protection of the application. within range.

Claims

A telescopic coupler locking device, characterized in that it comprises:

housing: including an open end, an end opposite said open end being connectable to an end of a telescoping coupler;

Drawbar: can be connected to the other end of the telescopic coupler, and at least one lock slot is arranged on the side wall of the drawbar;

Telescopic component: including a fixed end and a telescopic end, the fixed end is connected and arranged in the housing, the telescopic end is connected with the traction rod, and can protrude through the opening end of the housing; the telescopic The telescopic movement of the assembly can retract the towing rod into the space of the housing, or push it out of the housing;

Locking ring: sleeved inside the opening end of the housing;

At least one set of locking block assemblies: mounted on the locking ring, capable of expanding and contracting toward the radial direction of the housing;

The number of the lock slots corresponds to the number of the lock block assemblies, and when the draw bar is retracted into the housing, the lock block assemblies can be inserted into the lock slots to limit the extension of the draw bar sports.
The telescopic coupler locking device according to claim 1, wherein the lock block assembly comprises:

Elastic part: installed on the locking ring, it can expand and contract toward the radial direction of the housing;

Locking block: installed at the telescopic end of the elastic member;

The length of the elastic member is configured to be in a compressed state when in contact with the outer wall of the drawbar; the size of the locking block is configured to be inserted into the lock slot and restricted by the lock slot along the axis of the drawbar. movement in the direction.
The telescoping coupler locking device according to claim 2, wherein the lock block assembly further comprises a mounting block mounted on the locking ring, and the elastic member is mounted on the mounting block.
The telescopic coupler locking device according to claim 3, wherein the installation block includes a main body of the installation block and a protrusion of the installation block protruding relative to the main body of the installation block, and the elastic member is installed on the On the protruding part of the mounting block; the locking ring is provided with a through hole, and the side of the through hole close to the outer circumference of the housing is provided with a first stepped structure, and the protruding part of the mounting block can pass through the first The gap between the stepped structures passes through, and the main part of the installation block is installed on the first stepped structure.
The telescopic coupler locking device according to claim 4, wherein a second stepped structure is provided on a side of the through hole close to the inner circumference of the housing, and the outer circumference of the locking block includes a locking block protrusion, the The protruding part of the locking block is locked at the second step structure to restrict the locking block from coming out through the through hole.
The telescopic coupler locking device according to claim 2, characterized in that, the head of the locking block is provided with a wear pad.
The telescopic coupler locking device according to claim 1, characterized in that, along the circumferential direction of the drawbar, the locking groove is in the shape of an arc concave from both sides to the middle.
The telescopic coupler locking device according to any one of claims 1 to 7, wherein a plurality of first radially protruding blocks are arranged at intervals along the inner peripheral wall of the locking ring, and a plurality of first radially protruding blocks are arranged at intervals along the outer wall of the draw bar. A second radially protruding block, the second radially protruding block is located on a side close to the housing relative to the locking groove; the gap between any two of the first radially protruding blocks can be The second radially protruding block is allowed to pass through, and when the first radially protruding block is opposite to the second radially protruding block, the retraction movement of the draw rod to the housing is restricted.
The telescoping coupler locking device according to claim 8, wherein the locking block assembly is arranged at the first radially protruding block, and the locking groove is arranged at the second radially protruding block extension cord.
The telescopic coupler locking device according to claim 9, wherein a handle is provided on the outer wall of the locking ring, and a handle hole extending along the circumferential direction of the housing is provided at the opening end of the housing , the handle passes through the handle hole, and the circumferential length of the handle hole is configured such that the first radially protruding block can be rotated to the two adjacent second radially opposite blocks. To the gap of the protruding block, it can also be rotated to make the first radial protruding block opposite to the second radial protruding block.