A new double-lock structure quick-change device

Abstract

The utility model discloses a novel double lock structure quick change device, and the lock body is arranged on the mainboard through the pin shaft and is arranged in the middle part of the lock body, the lock body one end is provided with the lock hook, and the lock hook is matched with the lock groove and is arranged, the other end of lock body is connected with third connecting rod through pin shaft, and one side of third connecting rod is provided with the prying block, the middle part of lock body is connected with second connecting rod through pin shaft, and second connecting rod is connected with fourth connecting rod, first spring seat, first connecting rod through pin shaft, and the end of first connecting rod is connected with the end of third connecting rod through pin shaft, the utility model discloses the fourth connecting rod through the safety pin cooperation limiting block limiting, realizes the physical limiting of lock body, when the fourth connecting rod and second connecting rod are on the same straight line, realize the self -lock of geometric dead point principle (three point collinear), and the double lock structure can avoid the vibration or external force impact and lead to locking failure, and the accident risk of tool falling is reduced.

Description

Technical Field

[0001] This utility model relates to the field of quick-change device technology, specifically a novel double-lock quick-change device. Background Technology

[0002] The quick-change device (also known as a quick connector or quick-change joint) is a key accessory used to quickly switch the front attachments of an excavator. Traditional quick-change devices rely on a single hydraulic lock or gravity lock, which is prone to locking failure due to internal leakage of the cylinder, vibration or external impact, causing attachment (such as bucket) to fall off. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a novel double-locking quick-change device to address the shortcomings of the prior art, thereby solving at least one of the aforementioned technical problems.

[0004] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A novel double-lock structure quick-change device includes a main board and a secondary board, which are connected by a connecting body. The main board and the secondary board are connected at the top by a connecting shaft. Hooks are provided on one side of the bottom of both the main board and the secondary board, and the hooks on the main board and the secondary board are symmetrically arranged. Lock grooves are provided on the other side of the bottom of both the main board and the secondary board, and the lock grooves on the main board and the secondary board are symmetrically arranged. A lock body is provided on the main board via a pin, and the pin is located in the middle of the lock body. A lock hook is provided at one end of the lock body, and the lock hook is configured to cooperate with the lock groove. A third connecting rod is provided at the other end of the lock body via a pin. A pry block is provided on one side of the rod. A second connecting rod is connected to the middle of the lock body via a pin. The second connecting rod is connected to a fourth connecting rod, a first spring seat, and a first connecting rod via a pin. The end of the first connecting rod is connected to the end of a third connecting rod via a pin. The end of the fourth connecting rod is connected to one side of the main board via a pin. A limit block is provided on the main board, and the limit block is correspondingly provided on one side of the fourth connecting rod. A safety lock is provided on the sub-plate, and the safety lock is correspondingly provided on the other side of the fourth connecting rod. A second spring seat is provided on the main board via a pin, and the second spring seat is correspondingly provided on the first spring seat, and the first spring seat and the second spring seat are connected by a first spring.

[0005] Furthermore, a push rod is provided on the sub-plate via a pin, a limit groove is provided on the lower middle part of the push rod, a limit shaft is provided on the side of the lock body, the limit shaft and the limit groove are correspondingly engaged, a tension spring is connected to the lower side of the push rod, and the other end of the tension spring is connected to the lower part of the sub-plate.

[0006] Furthermore, a push block is provided at the end of the push rod, and after the limiting shaft and the limiting groove are engaged, the push block coincides with the locking groove.

[0007] Furthermore, the safety lock includes a base, which is fixed to a sub-plate. A sleeve is provided on the base, and a locking shaft is slidably connected inside the sleeve. A second spring is provided between the bottom of the locking shaft and the bottom of the sleeve. A through-hole toggle groove is provided on the outer side of the sleeve. The toggle groove is L-shaped. A toggle is provided at the bottom of the locking shaft, and the toggle engages with the toggle groove.

[0008] Furthermore, the first spring seat and the second spring seat are provided with mounting shafts for engaging the first spring, and the ends of the first spring are respectively fitted onto the mounting shafts of the first spring seat and the second spring seat.

[0009] Furthermore, after the locking hook and locking groove are engaged, the fourth link and the second link are on the same straight line.

[0010] Furthermore, both the lock groove and the hook are equipped with reinforcing blocks.

[0011] The beneficial effects of this utility model are: This invention uses a safety pin in conjunction with a limiting block to limit the fourth link, thus achieving physical limiting of the lock body. When the fourth link and the second link are on the same straight line, the device achieves self-locking based on the geometric dead point principle (three points collinear). The double-lock structure can prevent locking failure caused by vibration or external impact, reducing the risk of attachment falling off. Attached Figure Description

[0012] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] Figure 2 This is a schematic diagram of the sub-plate structure of this utility model.

[0015] Figure 3 This is a schematic diagram of the safety lock structure of this utility model.

[0016] Figure 4 This is a schematic diagram of the locked state of this utility model.

[0017] The attached diagram lists the components represented by each number as follows: Main board 1; Sub-board 2; Connector 3; Connecting shaft 4; Hook 5; Lock groove 6; Lock body 7; Lock hook 8; First link 9; Second link 10; Third link 11; Pry block 12; Fourth link 13; First spring seat 14; Second spring seat 15; First spring 16; Limit block 17; Push rod 18; Push block 19; Limit groove 20; Tension spring 21; Limit shaft 22; Safety lock 23; Base 231; Sleeve 232; Lock shaft 233; Second spring 234; Lock shaft groove 235; Pry block 236. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0020] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0021] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0022] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0023] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] Example 1: See Figures 1 to 4 This is a schematic diagram of the structure of this utility model, including a main board 1 and a secondary board 2. The main board 1 and the secondary board 2 are connected by a connector 3 to form an integrated design. Other components are located between the main board 1 and the secondary board 2. The main board 1 and the secondary board 2 are connected at the top by a connecting shaft 4, which is used to connect to the boom and the boom's hydraulic cylinder. Hooks 5 are provided on one side of the bottom of both the main board 1 and the secondary board 2, and the hooks 5 of the main board 1 and the secondary board 2 are symmetrically arranged for hooking one side of the attachment. Lock grooves 6 are provided on the other side of the bottom of the main board 1 and the secondary board 2, and the lock grooves 6 of the main board 1 and the secondary board 2 are symmetrically arranged. A lock body 7 is provided on the main board 1 by a pin, and the pin is located in the middle of the lock body 7. A lock hook 8 is provided at one end of the lock body 7, and the lock hook 8 is configured to cooperate with the lock groove 6 to fix the other side of the attachment. A third connecting rod 11 is connected to the other end of the lock body 7 by a pin. A pry block 12 is provided on one side of the third connecting rod 11. A sleeve 232 is used to pry the attachment. The tool is connected to the pry block 12. Pressing the pry block 12 opens the lock hook 8. The middle of the lock body 7 is connected to the second link 10 via a pin. The second link 10 is connected to the fourth link 13, the first spring seat 14, and the first link 9 via a pin. The end of the first link 9 is connected to the end of the third link 11 via a pin. The end of the fourth link 13 is connected to one side of the main board 1 via a pin. The main board 1 is provided with a limit block 17, which is correspondingly set on one side of the fourth link 13. The sub-plate 2 is provided with a safety lock 23, which is correspondingly set on the other side of the fourth link 13. The fourth link 13 is limited and fixed by the cooperation of the safety lock 23 and the limit block 17. The main board 1 is provided with a second spring seat 15 via a pin, which is correspondingly set on the first spring seat 14. The first spring seat 14 and the second spring seat 15 are connected by a first spring 16. Pushing the lock body 7 makes the lock hook 8 engage with the lock groove 6.

[0025] Furthermore, a push rod 18 is provided on the sub-plate 2 via a pin. A limiting groove 20 is provided on the lower side of the middle part of the push rod 18. A limiting shaft 22 is provided on the side of the lock body 7. The limiting shaft 22 and the limiting groove 20 are correspondingly engaged. A tension spring 21 is connected to the lower side of the push rod 18. The other end of the tension spring 21 is connected to the lower part of the sub-plate 2. When the lock body 7 is pried to a certain angle, the limiting shaft 22 on the lock body 7 can be inserted into the limiting groove 20, which can keep the lock body 7 open and facilitate the replacement of attachments.

[0026] Furthermore, a push block 19 is extended at the end of the push rod 18. After the limiting shaft 22 and the limiting groove 20 are engaged, the push block 19 coincides with the locking groove 6. When the attachment is installed into the locking groove 6, the push block 19 is pushed up by the attachment. At this time, the limiting groove 20 is disengaged from the limiting shaft 22, and the lock body 7 is reset under the action of the first spring 16, directly locking the attachment.

[0027] Furthermore, the safety lock 23 includes a base 231, which is fixed on the sub-plate 2. A sleeve 232 is provided on the base 231, and a locking shaft 233 is slidably connected inside the sleeve 232. A second spring 234 is provided between the bottom of the locking shaft 233 and the bottom of the sleeve 232. A through-hole toggle 236 groove is provided on the outer side of the sleeve 232. The toggle 236 groove is L-shaped. A toggle 236 is provided at the bottom of the locking shaft 233. The toggle 236 cooperates with the toggle 236 groove. When locking the lock body 7, the operator moves the toggle 236 to make the locking shaft 233 pop out. At this time, the locking shaft 233 and the limiting block 17 limit the fourth link 13. Before opening the lock body 7, the operator moves the toggle 236 and limits the toggle 236 through the toggle 236 groove. At this time, the fourth link 13 is not limited.

[0028] Furthermore, the first spring seat 14 and the second spring seat 15 are provided with mounting shafts that cooperate with the first spring 16. The ends of the first spring 16 are respectively fitted onto the mounting shafts of the first spring seat 14 and the second spring seat 15 to limit the first spring 16.

[0029] Furthermore, after the locking hook 8 and the locking groove 6 are engaged, the fourth link 13 and the second link 10 are on the same straight line. When the fourth link 13 and the second link 10 are on the same straight line, the principle of geometric dead point (three points collinear) is realized to achieve self-locking.

[0030] Furthermore, both the locking groove 6 and the hook 5 are equipped with reinforcing blocks to improve their strength.

[0031] When using this utility model, the device is connected to the boom and the boom cylinder via the connecting shaft 4. When installing the attachment, one side of the attachment is hooked onto the hook 5, and the other side of the attachment is installed into the locking groove 6. When installed into the locking groove 6, the other side of the attachment pushes the push block 19, and the limiting groove 20 disengages from the limiting shaft 22. Under the action of the first spring 16, the lock body 7 locks the other side of the attachment. The operator moves the lever 236 to make the locking shaft 233 pop out. At this time, the locking shaft 233 and the limiting block 17 limit the fourth connecting rod 13. When removing the attachment, the operator moves the lever 236 and limits the lever 236 through the slot of the lever 236. The locking shaft 233 retracts. At this time, the fourth link 13 is not limited by the locking shaft 233. The operator uses the sleeve 232 to connect with the pry block 12 and presses the pry block 12 to open the lock hook 8. The lock body 7 rotates, disengaging one side of the attachment from the lock groove 6. After the attachment disengages from the lock groove 6, when the limiting shaft 22 aligns with the limiting groove 20, the push rod 18, under the action of the tension spring 21, engages the limiting shaft 22 with the limiting groove 20, limiting the lock body 7 and facilitating the replacement of the attachment later.

[0032] This utility model uses a safety pin in conjunction with a limiting block 17 to limit the fourth link 13, thus achieving physical limiting of the lock body 7. When the fourth link 13 and the second link 10 are on the same straight line, this device achieves self-locking based on the geometric dead point principle (three points collinear). The double-lock structure can avoid locking failure caused by vibration or external impact, reducing the risk of attachment falling off.

[0033] The above are merely optional embodiments of this utility model and are not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

[0034] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way without contradiction. In order to avoid unnecessary repetition, this utility model will not describe the various possible combinations separately.

Claims

1. A novel double-lock quick-change device, comprising a main board (1) and a secondary board (2), wherein the main board (1) and the secondary board (2) are connected by a connector (3), and the main board (1) and the secondary board (2) are connected at the top by a connecting shaft (4), wherein a hook (5) is provided on one side of the bottom of both the main board (1) and the secondary board (2), and the hooks (5) of the main board (1) and the secondary board (2) are symmetrically arranged, and a locking groove (6) is provided on the other side of the bottom of the main board (1) and the secondary board (2), and the locking grooves (6) of the main board (1) and the secondary board (2) are symmetrically arranged, characterized in that: A lock body (7) is mounted on the main board (1) via a pin, with the pin located in the middle of the lock body (7). A lock hook (8) is provided at one end of the lock body (7), and the lock hook (8) is configured to cooperate with the lock groove (6). A third connecting rod (11) is connected to the other end of the lock body (7) via a pin. A pry block (12) is provided on one side of the third connecting rod (11). A second connecting rod (10) is connected to the middle of the lock body (7) via a pin. The second connecting rod (10) is connected to a fourth connecting rod (13), a first spring seat (14), and a first connecting rod (9) via a pin. The end of the first connecting rod (9) is connected to the third connecting rod via a pin. The end of the rod (11) is connected, and the end of the fourth connecting rod (13) is connected to one side of the main board (1) through a pin. The main board (1) is provided with a limit block (17), which is provided corresponding to one side of the fourth connecting rod (13). The sub-plate (2) is provided with a safety lock (23), which is provided corresponding to the other side of the fourth connecting rod (13). The main board (1) is provided with a second spring seat (15) through a pin. The second spring seat (15) is provided corresponding to the first spring seat (14), and the first spring seat (14) and the second spring seat (15) are connected by a first spring (16).

2. The novel double-locking quick-change device according to claim 1, characterized in that: A push rod (18) is provided on the sub-plate (2) via a pin. A limiting groove (20) is provided on the lower side of the middle part of the push rod (18). A limiting shaft (22) is provided on the side of the lock body (7). The limiting shaft (22) and the limiting groove (20) are correspondingly engaged. A tension spring (21) is connected to the lower side of the push rod (18). The other end of the tension spring (21) is connected to the lower part of the sub-plate (2).

3. The novel double-locking quick-change device according to claim 2, characterized in that: The end of the push rod (18) is extended to provide a push block (19). After the limiting shaft (22) and the limiting groove (20) are engaged, the push block (19) coincides with the locking groove (6).

4. The novel double-locking quick-change device according to claim 1, characterized in that: The safety lock (23) includes a base (231) fixed on a sub-plate (2). A sleeve (232) is provided on the base (231). A locking shaft (233) is slidably connected inside the sleeve (232). A second spring (234) is provided between the bottom of the locking shaft (233) and the bottom of the sleeve (232). A through-hole toggle (236) groove is provided on the outer side of the sleeve (232). The toggle (236) groove is L-shaped. A toggle (236) is provided at the bottom of the locking shaft (233). The toggle (236) cooperates with the toggle (236) groove.

5. The novel double-locking quick-change device according to claim 1, characterized in that: The first spring seat (14) and the second spring seat (15) are provided with mounting shafts for the first spring (16), and the ends of the first spring (16) are respectively mounted on the mounting shafts of the first spring seat (14) and the second spring seat (15).

6. The novel double-locking quick-change device according to claim 1, characterized in that: After the locking hook (8) and the locking groove (6) are engaged, the fourth link (13) and the second link (10) are on the same straight line.

7. The novel double-locking quick-change device according to claim 1, characterized in that: Both the lock groove (6) and the hook (5) are provided with reinforcing blocks.

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