A dual lock quick change connector

Abstract

The application discloses a double-lock quick-change connector, which comprises left and right symmetrical side plate assemblies, a rear hook mechanism and a locking control mechanism arranged between the two side plate assemblies; the rear hook mechanism comprises a sliding frame, a U-shaped clamping groove II with an opening facing the rear direction is arranged on the sliding frame, and a permanent magnet is fixedly arranged on the sliding frame and above the U-shaped clamping groove II; the locking control mechanism comprises a locking hydraulic cylinder, a rack transmission assembly, a front locking assembly and a rear auxiliary locking assembly; the rack transmission assembly comprises an upper rack, a transmission gear and a lower rack; the front locking assembly comprises a push plate, a locking pin and a locking control structure; the rear auxiliary locking assembly comprises a movable permanent magnet located above the fixed permanent magnet and a movable permanent magnet turnover gear engaged with the upper rack. The double-lock quick-change connector can simultaneously lock the front and rear connecting pin shafts of a working machine tool, and even if the locking hydraulic cylinder leaks and fails, the working machine tool will not fall off.

Description

Technical Field

[0001] This invention relates to a quick-change connector, specifically a double-lock quick-change connector suitable for excavators, belonging to the field of excavator tooling technology. Background Technology

[0002] With the continuous development of excavator technology, excavators have expanded from the traditional functions of digging, breaking, and backfilling using their buckets to perform multiple functions such as soil drilling, vibratory compaction, alligator snapping, grappling hook clamping, loosening, rolling, tunneling, and rock breaking by installing different attachments. This has greatly improved the use value and scope of excavators. To adapt to operational needs, frequent changes of attachments are required during construction. Quick-change connectors (also known as quick-connect couplings) allow excavators to quickly change various attachments, enabling multi-purpose use, reducing hoisting and disassembly time, improving work efficiency, and saving resources.

[0003] Quick-change connectors are generally divided into two main categories: mechanical quick-change connectors and hydraulic quick-change connectors. Hydraulic quick-change connectors are further divided into two structural types: hook type and pin type. Hook type hydraulic quick-change connectors use front and rear hooks (usually including a front fixed hook and a rear movable hook, or including a front fixed hook and a rear movable locking wedge) to connect with the working tool. The locking hydraulic cylinder directly pushes the rear movable hook or the rear movable locking wedge to move it away from the front fixed hook, thereby locking the front and rear connecting pins of the working tool. The front fixed locking hook of this traditional locking hook type hydraulic quick-change connector is usually just a U-shaped slot structure with the opening facing forward (also known as: front tiger mouth), and the locking force depends entirely on the locking hydraulic cylinder. Therefore, the frequent changes in load of the working tool during operation directly act on the locking hydraulic cylinder, which can easily reduce the service life of the locking hydraulic cylinder. In the event of leakage and failure of the locking hydraulic cylinder, the connecting pin of the working tool can easily fall off from the front fixed locking hook or the rear moving locking hook, or from the front fixed locking hook or the rear moving locking wedge, resulting in the working tool falling off.

[0004] To address this issue, existing technologies include double-lock quick-change connectors that can simultaneously lock the front and rear connecting pins of a work implement to prevent disengagement. However, existing double-lock quick-change connectors typically set the locking position at the front grip, while the locking mechanism for the rear connecting pin of the work implement is relatively limited. Either the rear locking stroke is too small (resulting in a limited application range for the quick-change), or the locking force is simply applied through a locking spring (which can easily damage the locking spring due to excessive pressure, leading to a significant reduction in its service life). Consequently, the locking effect of simultaneously locking the front and rear connecting pins of the work implement is not ideal. Summary of the Invention

[0005] To address the problems existing in the prior art, the present invention provides a double-lock quick-change connector, which can achieve the ideal effect of simultaneously locking the front and rear connecting pins of the work tool, and at the same time achieve the purpose of ensuring that the work tool will not fall off even if the locking hydraulic cylinder leaks or fails.

[0006] To achieve the above objectives, this double-lock quick-change connector includes side plate assemblies arranged symmetrically on the left and right sides, and a rear locking hook mechanism and a locking control mechanism disposed between the two side plate assemblies.

[0007] The side plate assembly is fixedly connected by a connecting plate to form a frame structure. The upper part of the side plate assembly is provided with a through hole for mounting the tipping hydraulic cylinder and a through hole for mounting the boom. The lower front part of the side plate assembly is provided with a front locking hook mechanism, which includes a U-shaped groove I with its opening facing directly forward. The U-shaped groove I penetrates the side plate assembly in the left-right direction.

[0008] The rear locking hook mechanism includes a slide, which is installed between two side plate assemblies via a translational guide structure I arranged in the front-rear direction. The slide has a U-shaped slot II with its opening facing directly rearward, and the U-shaped slot II passes through the slide in the left-right direction. A fixed permanent magnet is also fixedly installed on the slide at a position directly above the U-shaped slot II. The slide has a guide groove I arranged in the front-rear direction at the installation position of the pin II, and the pin II is inserted and installed in the guide groove I, which matches the outer diameter of the pin II.

[0009] The locking control mechanism includes a locking hydraulic cylinder, a rack and pinion drive assembly, a front locking assembly, and a rear auxiliary locking assembly;

[0010] The cylinder body end of the locking hydraulic cylinder is positioned and installed on the side plate assembly via pin I, and the telescopic end of the locking hydraulic cylinder is installed and connected to the slide via pin II.

[0011] The rack and pinion drive assembly includes an upper rack, a drive gear, and a lower rack. The teeth of the upper rack and the lower rack are arranged opposite each other along the front-back direction. The drive gear is meshed between the upper rack and the lower rack, and the upper rack is fixedly installed and connected to pin II. The drive gear is positioned and installed and connected to the side plate assembly through pin IV, which is coaxially fixedly connected to it.

[0012] The front locking assembly includes a push plate, a locking pin, and a locking control structure. The push plate is fixedly connected to the lower rack, and the push plate is connected to the locking pin through the locking control structure.

[0013] The rear auxiliary locking assembly includes a moving permanent magnet, which is located directly above the fixed permanent magnet. The moving permanent magnet is connected to the slide via a pin III. The slide has a guide groove II arranged in the front-to-back direction at the installation position of the pin III. The pin III is inserted into the guide groove II, which matches the outer diameter of the pin III. The pin III is also coaxially fixed with a moving permanent magnet flipping gear, which meshes with the upper rack.

[0014] As one embodiment of the locking control structure of the present invention, the locking control structure includes a locking pin mounting seat and an inclined structure disposed on the bottom surface of the push plate. The locking pin mounting seat located above the U-shaped slot I is fixedly connected to the side plate assembly, and the top surface of the locking pin mounting seat corresponds to the bottom surface of the push plate. The inclined structure on the bottom surface of the push plate makes the push plate have a wedge-shaped structure that is thinner at the front and thicker at the back. The locking pin of the spring pin structure includes a pin body and a spring. The pin body passes through the locking pin mounting seat in the vertical direction. The pin body is installed in the locking pin mounting seat by the spring. The top end of the pin body is a spherical structure that abuts against the bottom surface of the push plate, and the spring makes the bottom end of the pin body retract into the locking pin mounting seat.

[0015] As a further improvement of the present invention, the bottom surface of the locking pin mounting base is flush with the upper groove surface of the U-shaped groove I.

[0016] As a further improvement of the present invention, the locking pins of the spring pin structure are arranged in multiple ways along the left and right direction.

[0017] As another embodiment of the locking control structure of the present invention, the locking pin is a rocker arm structure that is hingedly connected to the side plate assembly, and the locking control structure is a connecting rod structure that is hingedly connected to the locking pin of the rocker arm structure. The locking pin of the rocker arm structure is in a swung, retracted state above the corresponding U-shaped slot I.

[0018] As a further improvement of the present invention, the rack and pinion drive assembly and the moving permanent magnet flipping gear are both arranged symmetrically in two sets.

[0019] As a further improvement of the present invention, the upper rack is mounted on the side plate assembly by a translational guide structure II arranged in the front-rear direction, and the lower rack is mounted on the side plate assembly by a translational guide structure III arranged in the front-rear direction.

[0020] As a further improvement of the present invention, the axial directions of pin I, pin II, pin III and pin IV are all arranged along the left and right directions, and pin I, pin II, pin III and pin IV are arranged in parallel space.

[0021] As a further improvement of the present invention, the magnetic pole directions of both the fixed permanent magnet and the moving permanent magnet are set along the vertical up-down direction.

[0022] As a further improvement of the present invention, the bottom plane of the fixed permanent magnet is flush with the upper groove surface of the U-shaped slot II.

[0023] Compared with existing technologies, this double-lock quick-change connector features a locking control mechanism comprising a locking hydraulic cylinder, a rack and pinion drive assembly, a front locking assembly, and a rear auxiliary locking assembly. Therefore, during the extension and retraction of the locking hydraulic cylinder, the rack and pinion drive assembly simultaneously drives the front locking assembly and the rear auxiliary locking assembly, enabling the loosening or locking of the front and rear mounting pins of the work implement. Furthermore, a fixed permanent magnet is fixed above the U-shaped slot II of the rear locking hook mechanism, and the rear auxiliary locking assembly includes a movable permanent magnet located directly above the fixed permanent magnet and a component mounted on the slide. The upper pin III and the moving permanent magnet flipping gear are coaxially fixed on the pin III, and the moving permanent magnet flipping gear is meshed with the upper rack. Therefore, during the extension and retraction of the locking hydraulic cylinder, the upper rack can drive the moving permanent magnet flipping gear to rotate the moving permanent magnet 180° and change the magnetic pole direction. By reasonably setting the stroke of guide groove I and guide groove II, the rotation action of the moving permanent magnet and the movement action of the slide can be realized in sequence when the locking hydraulic cylinder extends and retracts. Controlling the action of the locking hydraulic cylinder causes the front and rear mounting pins of the work tool to be mounted. During the loosening process, the magnetic poles of the moving permanent magnet gradually become opposite to those of the fixed permanent magnet, and their magnetic fields gradually become mutually repulsive. The repulsive force between the magnetic fields of the moving and fixed permanent magnets reduces the overall magnetic field strength, facilitating the loosening of the rear mounting pin of the work tool. During the locking process, the hydraulic cylinder is controlled to tighten the front and rear mounting pins of the work tool. During this process, the magnetic poles of the moving permanent magnet gradually become the same as those of the fixed permanent magnet, and their magnetic fields gradually become mutually opposite. In the state of phase attraction, the combined magnetic attraction of the fixed permanent magnet magnetic field and the moving permanent magnet magnetic field increases the total magnetic field strength, which can provide a greater auxiliary locking force to the rear mounting pin of the working tool. At the same time, this combined magnetic attraction can apply a force to the moving permanent magnet turning gear to prevent it from turning, thereby achieving self-locking between the moving permanent magnet turning gear and the upper rack without controlling the extension and retraction of the locking hydraulic cylinder. This achieves self-locking of the entire rack and pinion transmission assembly, so that even if the locking hydraulic cylinder leaks and fails, the working tool will not fall off. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural diagram of the invention from the left front view.

[0025] Figure 2 yes Figure 1 A 3D structural diagram after removing the left side panel assembly;

[0026] Figure 3 This is a three-dimensional structural schematic diagram of the invention from the left rear view.

[0027] Figure 4 yes Figure 3 A 3D structural diagram after removing the left side panel assembly;

[0028] Figure 5 This is a schematic diagram of the structure of the locking pin of the front locking assembly of the present invention when a spring pin structure is adopted;

[0029] Figure 6 yes Figure 5 AA section view;

[0030] Figure 7 This is a schematic diagram of the structure of the locking pin of the front locking assembly of the present invention when it adopts a rocker arm structure;

[0031] Figure 8 This is a schematic diagram of the structure of the present invention when a compression spring is provided between the push plate and the slide.

[0032] In the diagram: 1. Side plate assembly; 11. U-shaped slot I; 2. Rear locking hook mechanism; 21. Slide; 22. U-shaped slot II; 23. Fixed permanent magnet; 24. Guide slide I; 25. Guide slide II; 3. Locking control mechanism; 31. Locking hydraulic cylinder; 311. Pin I; 312. Pin II; 32. Rack and pinion drive assembly; 321. Upper rack; 322. Drive gear; 323. Lower rack; 324. Pin IV; 33. Front locking assembly; 331. Push plate; 332. Locking pin; 333. Locking pin mounting seat; 34. Rear auxiliary locking assembly; 341. Moving permanent magnet; 342. Pin III; 343. Moving permanent magnet flipping gear; 35. Compression spring. Detailed Implementation

[0033] The invention will be further described below with reference to the accompanying drawings (hereinafter referred to as...). Figure 5 , Figure 7 , Figure 8 (The left side is described as the front).

[0034] like Figures 1 to 7 As shown, this double-lock quick-change connector includes side plate assemblies 1 arranged symmetrically on the left and right, a rear locking hook mechanism 2 and a locking control mechanism 3 disposed between the two side plate assemblies 1.

[0035] The side plate assembly 1 is fixedly connected by a connecting plate to form a frame structure. The upper part of the side plate assembly 1 is provided with a bucket hydraulic cylinder mounting through hole that cooperates with the mounting pin of the bucket hydraulic cylinder and a stick mounting through hole that cooperates with the mounting pin of the excavator stick at intervals along the front-back direction. The lower front part of the side plate assembly 1 is provided with a front locking hook mechanism, which includes a U-shaped groove I11 with its opening facing directly forward. The U-shaped groove I11 penetrates the side plate assembly 1 in the left-right direction, and the groove width of the U-shaped groove I11 is clearance-fitted with the outer diameter of the front mounting pin of the working tool.

[0036] The rear locking hook mechanism 2 includes a slide 21, which is installed between two side plate assemblies 1 via a translational guide structure I arranged in the front-to-back direction. The translational guide structure I can be a guide groove on the side plate assembly 1 and a guide protrusion structure that cooperates with it on the slide 21, or a guide rail on the side plate assembly 1 and a guide wheel structure that cooperates with it on the slide 21, or other linear reciprocating translational guide structures. The slide 21 can move between the two side plate assemblies 1 in the front-to-back direction via the translational guide structure I. The slide 21 is provided with a U-shaped slot II 22 with its opening facing directly rearward. The U-shaped slot II 22 penetrates the slide 21 in the left-to-right direction, and the width of the U-shaped slot II 22 is clearance-fitted with the outer diameter of the rear mounting pin of the working tool. A fixed permanent magnet 23 is also fixedly provided on the slide 21 at a position directly above the U-shaped slot II 22.

[0037] The locking control mechanism 3 includes a locking hydraulic cylinder 31, a rack and pinion transmission assembly 32, a front locking assembly 33, and a rear auxiliary locking assembly 34;

[0038] The cylinder body end of the locking hydraulic cylinder 31, which is arranged in the front-to-back direction, is positioned and installed on the side plate assembly 1 through the pin I 311. The telescopic end of the locking hydraulic cylinder 31 is installed and connected to the slide 21 through the pin II 312. The slide 21 is provided with a guide groove I 24 arranged in the front-to-back direction at the installation position of the pin II 312. The pin II 312 is inserted and installed in the guide groove I 24, which matches the outer diameter of the pin II 312.

[0039] The rack and pinion drive assembly 32 includes an upper rack 321, a drive gear 322, and a lower rack 323. The teeth of the upper rack 321 and the lower rack 323 are arranged opposite each other along the front-back direction. The drive gear 322 is meshed and connected between the upper rack 321 and the lower rack 323. The upper rack 321 is fixedly connected to the pin II 312. The drive gear 322 is positioned and connected to the side plate assembly 1 through the pin IV 324, which is fixedly connected to it on the same axis.

[0040] The front locking assembly 33 includes a push plate 331, a locking pin 332, and a locking control structure. The push plate 331 is fixedly connected to the lower rack 323. The push plate 331 is connected to the locking pin 332 through the locking control structure. When the lower rack 323 drives the push plate 331 to move in the front and back direction, the locking control structure can control the locking pin 332 to lock or release the front mounting pin of the work tool. The locking control structure can be any structure that converts the horizontal movement of the push plate 331 into the locking action of the locking pin 332.

[0041] The rear auxiliary locking assembly 34 includes a movable permanent magnet 341, which is located directly above the fixed permanent magnet 23. The movable permanent magnet 341 is connected to the slide 21 via a pin Ⅲ 342. The slide 21 is provided with a guide groove Ⅱ 25 in the front-to-back direction corresponding to the installation position of the pin Ⅲ 342. The pin Ⅲ 342 is inserted and installed in the guide groove Ⅱ 25 that matches the outer diameter of the pin Ⅲ 342. The movable permanent magnet flipping gear 343 is also coaxially fixed on the pin Ⅲ 342 and is meshed with the upper rack 321. When the upper rack 321 moves in the front-to-back direction, it can drive the movable permanent magnet 341 to flip 180° and change the magnetic pole direction by driving the movable permanent magnet flipping gear 343.

[0042] The top of this double-lock quick-change connector can be installed on the bucket hydraulic cylinder and stick of the excavator through the bucket hydraulic cylinder mounting through hole and the stick mounting through hole. To facilitate the installation of the locking control mechanism 3, the axial directions of pins I 311, II 312, III 342, and IV 324 are all set in the left-right direction, and they are arranged in parallel space. By reasonably setting the stroke of guide grooves I 24 and II 25, the rotating action of the permanent magnet 341 and the moving action of the slide 21 can be achieved sequentially when the locking hydraulic cylinder 31 extends or retracts. Figure 5As shown, taking the initial state of the locking hydraulic cylinder 31 in the extended state as an example, at this time, the pin shaft II 312 is located at the rear limit stroke position of the guide slide groove I 24, the slide 21 is in the fully extended state, and the magnetic pole direction of the moving permanent magnet 341 is the same as the magnetic pole direction of the fixed permanent magnet 23. Before installing the work tool, the telescopic end of the locking hydraulic cylinder 31 is retracted forward. At this time, the pin shaft II 312 drives the upper rack 321 to move forward. On the one hand, during the forward movement of the pin shaft II 312 along the guide slide groove I 24, the upper rack 321 moves forward relative to the slide 21. The upper rack 321 drives the moving permanent magnet 341 to rotate through the moving permanent magnet rotating gear 343. After the pin shaft II 312 moves to the front limit stroke position of the guide slide groove I 24, the moving permanent magnet 341 completes a 180° rotation and changes the magnetic pole direction (at this time, the magnetic pole direction of the moving permanent magnet 341 is the same as the magnetic pole direction of the fixed permanent magnet 23). The magnetic poles of the fixed permanent magnet 23 are opposite, and the magnetic field of the moving permanent magnet 341 is in a state of repulsion with the magnetic field of the fixed permanent magnet 23. The repulsive force between the magnetic field of the fixed permanent magnet 23 and the magnetic field of the moving permanent magnet 341 reduces the total magnetic field strength. As the locking hydraulic cylinder 31 continues to retract, the pin II 312 drives the slide 21 to move forward as a whole (at this time, the upper rack 321 is stationary relative to the slide 21), realizing the flipping action of the moving permanent magnet 341 and then the forward movement of the slide 21 to make way. On the other hand, during the forward movement of the upper rack 321, the transmission gear 322 drives the lower rack 323 to move backward, thereby realizing that the lower rack 323 drives the push plate 331 to move backward, so that the push plate 331 controls the locking pin 332 through the locking control structure to make the U-shaped slot I11 gradually open to make way.

[0043] After the locking hydraulic cylinder 31 is fully retracted, the slide 21 is in the fully retracted and fully open state, and the U-shaped groove I 11 is in the fully open state. At this time, control the excavator's bucket hydraulic cylinder and stick to move. First, control this double-lock quick-change connector to move forward so that the U-shaped groove I 11 can be engaged with the front mounting pin of the work tool. Then, control this double-lock quick-change connector to rotate clockwise around the axis of the front mounting pin of the work tool so that the U-shaped groove II 22 is aligned with the rear mounting pin of the work tool, thus completing the docking of the work tool.

[0044] Then, the locking hydraulic cylinder 31 is extended. At this time, the pin shaft II 312 drives the upper rack 321 to move backward. On the one hand, as the pin shaft II 312 moves backward along the guide groove I 24, the upper rack 321 moves backward relative to the slide 21. The upper rack 321 drives the moving permanent magnet 341 to rotate through the moving permanent magnet flipping gear 343. After the pin shaft II 312 moves to the rear limit stroke position of the guide groove I 24, the moving permanent magnet 341 completes a 180° rotation and changes the magnetic pole direction (at this time, the magnetic pole direction of the moving permanent magnet 341 is the same as the magnetic pole direction of the fixed permanent magnet 23, and the moving permanent magnet 341...). The magnetic field of the fixed permanent magnet 23 and the magnetic field of the moving permanent magnet 341 are in a state of opposite attraction. The combined magnetic attraction between the magnetic field of the fixed permanent magnet 23 and the magnetic field of the moving permanent magnet 341 increases the total magnetic field strength. As the locking hydraulic cylinder 31 continues to extend, the pin Ⅱ 312 drives the slide 21 to move backward as a whole (at this time, the upper rack 321 is stationary relative to the slide 21), so that the U-shaped slot Ⅱ 22 gradually engages with the rear mounting pin of the working tool, realizing the flipping action of the advanced moving permanent magnet 341, and then the slide 21 moves backward and engages. On the other hand, the backward movement of the upper rack 321... During the process, the transmission gear 322 drives the lower rack 323 to move forward, which in turn drives the push plate 331 to move forward. This allows the push plate 331 to control the locking pin 332 via the locking control structure, gradually closing the U-shaped groove I 11 and the front mounting pin of the sealing tool. Once the locking hydraulic cylinder 31 is fully extended, the slide 21 is extended, and the U-shaped groove II 22 is fully engaged with the rear mounting pin of the working tool. The U-shaped groove I 11 is in the closed state, with the locking pin 332 completely sealing the front mounting pin of the working tool, thus completing the operation. The machine is locked in both directions. At this time, the combined magnetic attraction of the magnetic field of the fixed permanent magnet 23 and the magnetic field of the moving permanent magnet 341 can provide an auxiliary locking force for the rear mounting pin of the machine. At the same time, this combined magnetic attraction can apply a force to the moving permanent magnet turning gear 343 to prevent the moving permanent magnet turning gear 343 from turning. Thus, the moving permanent magnet turning gear 343 and the upper rack 321 are self-locked without controlling the extension and retraction of the locking hydraulic cylinder 31. This achieves the self-locking of the entire rack and pinion transmission assembly 32. Even if the locking hydraulic cylinder 31 leaks and fails, the machine will not fall off.

[0045] As one embodiment of the locking control structure of the front locking assembly 33 of the present invention, the locking control structure is a control structure for controlling the extension and retraction of the locking pin 332, such as... Figure 5 , Figure 6As shown, the locking control structure includes a locking pin mounting seat 333 and an inclined structure set on the bottom surface of the push plate 331. The locking pin mounting seat 333, located above the U-shaped groove I11, is fixedly connected to the side plate assembly 1, and the top surface of the locking pin mounting seat 333 corresponds to the bottom surface of the push plate 331. The bottom surface of the locking pin mounting seat 333 can be flush with the upper groove surface of the U-shaped groove I11. The inclined structure on the bottom surface of the push plate 331 makes the push plate 331 have a wedge-shaped structure that is thinner at the front and thicker at the back. Multiple locking pins 332 of the spring pin structure can be set in the left and right direction. The locking pin 332 of the spring pin structure includes a pin body and a spring. The pin body passes through the locking pin mounting seat 333 in the vertical direction. The pin body is installed in the locking pin mounting seat 333 by the spring. The top end of the pin body is a spherical structure that abuts against the bottom surface of the push plate 331, and the spring makes the bottom end of the pin body retract into the locking pin mounting seat 333. When the rack 323 drives the push plate 331 forward, the wedge-shaped push plate 331 can press the locking pin 332 of the spring pin structure through the inclined structure on the bottom surface of the push plate 331, causing the bottom end of the pin to extend to the outside of the locking pin mounting seat 333, thereby blocking the front mounting pin of the work tool and preventing the front mounting pin of the work tool from coming out of the U-shaped groove I11; when the rack 323 drives the push plate 331 backward, the locking pin 332 of the spring pin structure can be reset under the action of the spring's return force, causing the bottom end of the pin to retract into the locking pin mounting seat 333, so that the U-shaped groove I11 is in an open, yielding state, facilitating the installation or removal of the front mounting pin of the work tool. Multiple locking pins 332 of the spring pin structure can be configured in the left-right direction.

[0046] As another embodiment of the locking control structure of the front locking assembly 33 of the present invention, the locking control structure is a control structure for controlling the flipping of the locking pin 332, such as... Figure 7 As shown, the locking pin 332 is a swing arm structure hinged to the side plate assembly 1. The locking control structure is a connecting rod structure hinged to the locking pin 332 of the swing arm structure. The locking pin 332 of the swing arm structure is in a normally swinging retracted state above the corresponding U-shaped groove I11. When the rack 323 drives the push plate 331 to move forward, the push plate 331 can control the locking pin 332 of the swing arm structure to swing and extend into the corresponding U-shaped groove I11 through the locking control structure of the connecting rod structure, thereby blocking the front mounting pin of the work tool and preventing the front mounting pin of the work tool from coming out of the U-shaped groove I11. When the rack 323 drives the push plate 331 to move backward, the push plate 331 can control the locking pin 332 of the swing arm structure to swing and retract into the corresponding U-shaped groove I11 through the locking control structure of the connecting rod structure, thereby opening the U-shaped groove I11 and facilitating the installation or removal of the front mounting pin of the work tool. The locking pin 332 of the rocker arm structure can also be set in multiple directions along the left and right.

[0047] To further improve the self-locking effect of the entire rack and pinion drive assembly 32, as a further improvement of the present invention, such as... Figure 8 As shown, a compression spring 35 is also provided between the push plate 331 and the slide 21. The compression direction of the compression spring 35 is set along the front-to-back direction, and the front and rear ends of the compression spring 35 are respectively positioned and abutted against the push plate 331 and the slide 21. After the working tool is locked in both directions, the compression spring 35 can provide a compressive force to prevent the upper rack 321 from moving forward and the lower rack 323 from moving backward, thereby further improving the self-locking effect of the entire rack and pinion transmission assembly 32.

[0048] To ensure stable transmission of the rack and pinion drive assembly 32 and the moving permanent magnet reversing gear 343, as a further improvement of the present invention, such as... Figure 4 As shown, the rack and pinion drive assembly 32 and the moving permanent magnet reversing gear 343 are both arranged symmetrically in two sets.

[0049] To ensure stable transmission of the rack and pinion drive assembly, as a further improvement of the present invention, the upper rack 321 is mounted on the side plate assembly 1 via a translational guide structure II arranged in the front-rear direction, and the lower rack 323 or push plate 331 is mounted on the side plate assembly 1 via a translational guide structure III arranged in the front-rear direction. Similar to the translational guide structure I, the translational guide structure II (or translational guide structure III) can be a guide groove provided on the side plate assembly 1 and a guide protrusion structure provided on the upper rack 321 (or lower rack 323 or push plate 331), or it can be a guide rail provided on the side plate assembly 1 and a guide wheel structure provided on the upper rack 321 (or lower rack 323 or push plate 331), or other linear reciprocating translational guide structures.

[0050] To achieve a better magnetic assisted locking effect on the rear mounting pin of the work tool, as a further improvement of the present invention, the magnetic pole directions of the fixed permanent magnet 23 and the moving permanent magnet 341 are both set in the vertical up and down direction, and the bottom plane of the fixed permanent magnet 23 can also be set flush with the upper groove surface of the U-shaped slot II 22.

[0051] During the extension and retraction of the locking hydraulic cylinder 31 of this double-lock quick-change connector, the rack and pinion drive assembly 32 can simultaneously drive the front locking assembly 33 and the rear auxiliary locking assembly 34 to loosen or lock the front and rear mounting pins of the work tool. During the extension and retraction of the locking hydraulic cylinder 31, the upper rack 321 can drive the moving permanent magnet flipping gear 343 to rotate the moving permanent magnet 341 by 180° and change the direction of the magnetic pole. By reasonably setting the stroke of the guide groove I 24 and the guide groove II 25, the rotating action of the moving permanent magnet 341 and the moving action of the slide 21 can be carried out in sequence when the locking hydraulic cylinder 31 extends and retracts. This can achieve the ideal effect of locking the front and rear connecting pins of the work tool at the same time, and also ensure that the work tool will not fall off even if the locking hydraulic cylinder leaks or fails.

Claims

1. A double-lock quick-change connector, comprising left and right symmetrical side plate assemblies (1) and a rear hook mechanism (2) and a locking control mechanism (3) arranged between the two side plate assemblies (1); the side plate assemblies (1) are fixedly connected in a frame structure by connecting plates, the upper part of the side plate assemblies (1) is provided with a tipping cylinder mounting hole and a boom mounting hole, and the front lower part of the side plate assemblies (1) is provided with a front hook mechanism, the front hook mechanism comprises a U-shaped clamping groove I (11) with an opening facing the front, and the U-shaped clamping groove I (11) penetrates the side plate assemblies (1) along the left-right direction; the rear hook mechanism (2) comprises a sliding frame (21), the sliding frame (21) is installed between the two side plate assemblies (1) through a translation guide structure I arranged in the front-rear direction, and the sliding frame (21) is provided with a U-shaped clamping groove II (22) with an opening facing the rear, and the U-shaped clamping groove II (22) penetrates the sliding frame (21) along the left-right direction; the locking control mechanism (3) comprises a locking hydraulic cylinder (31), the cylinder end of the locking hydraulic cylinder (31) is fixedly and positionally connected with the side plate assemblies (1) through a pin shaft I (311), and the telescopic end of the locking hydraulic cylinder (31) is connected with the sliding frame (21) through a pin shaft II (312); characterized in that, a permanent magnet (23) is further fixedly arranged on the sliding frame (21) above the U-shaped clamping groove II (22); a guide sliding groove I (24) arranged in the front-rear direction is arranged on the sliding frame (21) at the mounting position of the pin shaft II (312), and the pin shaft II (312) is installed in the guide sliding groove I (24) matched with the outer diameter of the pin shaft II (312); the locking control mechanism (3) further comprises a rack transmission assembly (32), a front locking assembly (33) and a rear auxiliary locking assembly (34); the rack transmission assembly (32) comprises an upper rack (321), a transmission gear (322) and a lower rack (323), the tooth portions of the upper rack (321) and the lower rack (323) arranged in the front-rear direction are oppositely arranged, the transmission gear (322) is connected in meshing cooperation between the upper rack (321) and the lower rack (323), and the upper rack (321) is fixedly and positionally connected with the pin shaft II (312), and the transmission gear (322) is fixedly and positionally connected with the side plate assemblies (1) through a pin shaft IV (324) coaxially fixedly connected therewith; the front locking assembly (33) comprises a push plate (331), a locking pin (332) and a locking control structure, the push plate (331) is fixedly and positionally connected with the lower rack (323), and the push plate (331) is connected with the locking pin (332) through the locking control structure. The rear auxiliary locking assembly (34) comprises a movable permanent magnet (341), and the movable permanent magnet (341) is located directly above the fixed permanent magnet (23). The movable permanent magnet (341) is connected with the sliding frame (21) through a pin shaft III (342). The sliding frame (21) is provided with a sliding guide groove II (25) arranged in the front-rear direction at a position corresponding to the installation position of the pin shaft III (342). The pin shaft III (342) is installed in the sliding guide groove II (25) in cooperation with the outer diameter of the pin shaft III (342). The pin shaft III (342) is further coaxially provided with a movable permanent magnet overturning gear (343), and the movable permanent magnet overturning gear (343) is in meshing and cooperating connection with the upper rack (321).

2. The dual-lock quick change connector of claim 1, wherein, The locking control structure comprises a locking pin mounting seat (333) and an inclined surface structure arranged on the bottom surface of the push plate (331). The locking pin mounting seat (333) located above the U-shaped clamping groove I (11) is fixedly connected with the side plate assembly (1), and the top surface of the locking pin mounting seat (333) is arranged corresponding to the bottom surface of the push plate (331). The inclined surface structure on the bottom surface of the push plate (331) makes the push plate (331) have a wedge-shaped structure with a thin front and a thick rear. The locking pin (332) of the spring pin structure comprises a pin body and a spring. The pin body penetrates the locking pin mounting seat (333) in the vertical direction, and the pin body is installed in the locking pin mounting seat (333) through the spring. The top end of the pin body is a spherical surface structure abutting against the bottom surface of the push plate (331), and the spring makes the bottom end of the pin body always shrink into the locking pin mounting seat (333).

3. The dual-lock quick change connector of claim 2, wherein, The bottom surface of the locking pin mounting seat (333) is flush with the upper groove surface of the U-shaped clamping groove I (11).

4. The dual-lock quick change connector of claim 1, wherein, The locking pin (332) is a swing lever structure hingedly connected with the side plate assembly (1). The locking control structure is a connecting rod structure hingedly connected with the locking pin (332) of the swing lever structure. The locking pin (332) of the swing lever structure is always in a retracted state corresponding to the position above the U-shaped clamping groove I (11).

5. The dual-lock quick change connector of any one of claims 1-4, wherein, The locking pin (332) is arranged in multiple numbers in the left-right direction.

6. The dual-lock quick change connector of any one of claims 1-4, wherein, A compression spring (35) is further arranged between the push plate (331) and the sliding frame (21). The compression direction of the compression spring (35) is arranged in the front-rear direction, and the front and rear ends of the compression spring (35) are respectively positioned and abut against the push plate (331) and the sliding frame (21).

7. The dual-lock quick change connector of any one of claims 1-4, wherein, The rack transmission assembly (32) and the movable permanent magnet overturning gear (343) are both arranged in two groups in left-right symmetry.

8. The dual-lock quick change connector of any one of claims 1-4, wherein, The upper rack (321) is installed on the side plate assembly (1) through a translation guide structure II arranged in the front-rear direction. The lower rack (323) is installed on the side plate assembly (1) through a translation guide structure III arranged in the front-rear direction.

9. The dual-lock quick change connector of any one of claims 1-4, wherein, The magnetic pole directions of the fixed permanent magnet (23) and the movable permanent magnet (341) are both arranged in the vertical up-down direction.

10. The dual-lock quick change connector of any one of claims 1-4, wherein, The bottom surface of the fixed permanent magnet (23) is flush with the upper groove surface of the U-shaped clamping groove II (22).

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