Quick connection device and construction machinery

Abstract

The present disclosure relates to a quick connection device and construction machinery. Among them, the quick connection device includes a mechanism for connecting a tool to a mounting base, and the tool is provided with a main pin shaft extending along a preset direction; the quick connection device includes a main locking component, the main locking component has a first locking state and a first unlocking state, and includes: a main locking hook, the first end of the main locking hook is rotatably connected to a first pin shaft extending along the preset direction, and the second end of the main locking hook is used for engaging with the main pin shaft in the first locking state; a locking hook, the first end of the locking hook is rotatably connected to a second pin shaft extending along the preset direction, and the second end of the locking hook is used for engaging with the first end of the main locking hook in the first locking state; and a position retaining member, rotatably connected to the second pin shaft, and used for keeping the locking hook in the locking position when the quick connection device rotates within a first angle range, and the locking hook has a tendency to disengage from the main locking hook under the action of gravity within the first angle range.

Description

Technical Field

[0001] The present disclosure relates to the technical field of construction machinery, and particularly to a quick connection device and construction machinery. Background Art

[0002] As the most commonly used construction machinery in daily construction, excavators undertake various operation functions. The application of multi-functional tools is also becoming more and more extensive. As an important structure between the excavator and the tool, the quick coupler realizes the quick switching and installation of various working devices, thus expanding the use range of the excavator, saving the waste of time and manpower caused by disassembling the pin shaft due to replacing the attachment, and improving the work efficiency.

[0003] Currently, the most commonly used quick coupler is a hydraulic quick coupler, which drives a locking mechanism by a hydraulic cylinder to realize the connection and separation with the tool. The coupler includes a fixed hook claw and a movable hook claw. After the fixed hook claw hooks a pin shaft of the tool, the driving hydraulic cylinder makes the movable hook claw hook another pin shaft of the tool, and inserts a safety pin to lock the movable hook claw, thereby realizing the connection of the tool. However, it is found in actual use that such a quick coupler has poor safety, and sometimes the tool may fall off due to operation errors during the operation process or the failure of the hydraulic system. Summary of the Invention

[0004] The present disclosure provides a quick connection device and construction machinery, which can improve the safety of the connection between the tool and the installation base.

[0005] In a first aspect of the present disclosure, a quick connection device is provided for connecting a tool to an installation base. The tool is provided with a main pin shaft extending along a preset direction. The quick connection device includes a main locking member, which has a first locking state and a first unlocking state, and includes:

[0006] A main locking hook, the first end of which is rotatably connected to a first pin shaft extending along the preset direction, and the second end of which is used for engaging with the main pin shaft in the first locking state;

[0007] A locking hook, the first end of which is rotatably connected to a second pin shaft extending along the preset direction, and the second end of which is used for engaging with the first end of the main locking hook in the first locking state; and

[0008] A position holding member, rotatably connected to the second pin shaft, for keeping the locking hook in the locking position when the quick connection device rotates within a first angular range, and the locking hook has a tendency to disengage from the main locking hook under the action of gravity within the first angular range.

[0009] In some embodiments, the position retaining member includes a spring pressing plate which is arranged side by side with the locking hook along the second pin shaft. The first end of the spring pressing plate is used to abut against the mounting base within a first angular range, and the second end of the spring pressing plate is used to apply a force to the locking hook so that the locking hook engages with the main locking hook.

[0010] In some embodiments, the locking hook is provided with a third pin shaft near its second end. The third pin shaft extends beyond the side surface of the locking hook along a preset direction, and the second end of the spring pressing plate abuts against the length segment of the third pin shaft that extends beyond the locking hook.

[0011] In some embodiments, the spring pressing plate includes:

[0012] a bushing sleeved on the second pin shaft;

[0013] a straight plate segment connected to one side of the bushing for applying a force to the locking hook; and

[0014] a curved plate segment connected to the other side of the bushing. The free end of the curved plate segment abuts against the mounting base through the side surface away from the center of curvature.

[0015] In some embodiments, the locking hook includes a hook body and a hook claw that are connected to form an L-shaped structure. The hook body is connected to the second pin shaft, and the hook claw is used to engage with the main locking hook;

[0016] Wherein, when the locking hook rotates until the hook body extends vertically upward, it is the first critical position, and the first angular range is the angular range between the first critical position and the position of the locking hook when it rotates to the limit position in the direction away from the hook claw.

[0017] In some embodiments, the locking hook is used to press above the main locking hook within a second angular range so as to keep the main locking hook in the locked position by relying on its own gravity.

[0018] In some embodiments, the locking hook includes a hook body and a hook claw that are connected to form an L-shaped structure. The hook body is connected to the second pin shaft, and the hook claw is used to engage with the main locking hook;

[0019] Wherein, when the locking hook rotates until the hook body extends vertically upward, it is the first critical position, and when the hook body extends vertically downward, it is the second critical position. The second angular range is the angular range between the first critical position and the second critical position.

[0020] In some embodiments, the locking hook includes a hook body and a hook claw that are connected to form an L-shaped structure. The hook body is connected to the second pin shaft, and the hook claw is used to engage with the main locking hook;

[0021] Wherein, when the locking hook rotates until the hook body extends vertically downward, it is the second critical position, and the main locking component is in the first unlocking state when the main locking hook rotates to the second critical position.

[0022] In some embodiments, it further includes a first linear driving component, the first end of which is hinged to the mounting base body, and the second end is hinged to the main locking hook. The first linear driving component is used to drive the main locking hook and the main pin shaft to cooperate and separate.

[0023] In some embodiments, the implement is provided with a secondary pin shaft extending along a preset direction. The quick connection device includes a secondary locking component, which has a second locked state and a second unlocked state. When the main locking component is in the first unlocked state, the secondary locking component remains in the second locked state.

[0024] In some embodiments, in the preset direction, the main locking component and the secondary locking component are arranged side by side.

[0025] In some embodiments, the secondary locking component includes:

[0026] A secondary locking hook, the first end of which is rotatably connected to a fourth pin shaft extending along the preset direction, and the second end of which is used to engage with the secondary pin shaft in the second locked state; and

[0027] A locking mechanism, which is used to keep the secondary locking hook in the locked position when the main locking hook and the main pin shaft are within a predetermined separation range and the main locking hook does not apply a force.

[0028] In some embodiments, the locking mechanism is a four-bar linkage mechanism and includes:

[0029] A first rocker arm, the first end of which is rotatably connected to a second pin shaft;

[0030] A stop iron, the first end of which is rotatably connected to a fifth pin shaft extending along the preset direction, and the second end of which is used to achieve locking when abutted against the secondary locking hook; and

[0031] A connecting rod, the first end of which is rotatably connected to the second end of the first rocker arm, and the second end of which is rotatably connected to the stop iron.

[0032] In some embodiments, the first end of the connecting rod extends a preset distance relative to the first rocker arm, and is used to receive the unlocking force applied by the main locking hook when it exceeds the predetermined separation range.

[0033] In some embodiments, the second end of the connecting rod is rotatably connected to the middle area of the stop iron.

[0034] In some embodiments, the secondary locking component further includes a locking pin, which is arranged on the side of the stop iron facing the main locking hook and is used to keep the stop iron in the position where the secondary locking hook is locked; and / or the secondary locking component further includes an elastic element, which is arranged between the stop iron and the fifth pin shaft and is used to keep the stop iron in the position where the secondary locking hook is locked.

[0035] In some embodiments, the secondary locking member further includes a limiting block, which is used to limit the extreme position of the secondary locking hook so that the secondary locking hook maintains a posture convenient for the secondary pin shaft to be inserted.

[0036] The second aspect of the present disclosure provides a construction machine, including: a mounting base, a tool, and the quick connection device of the above embodiments, and the quick connection device connects the tool to the mounting base.

[0037] In some embodiments, the construction machine is an excavator, the tool includes a bucket, the mounting base includes a dipper arm and a connecting rod, the bucket is connected to the first end of the dipper arm and the first end of the connecting rod through the quick connection device, and the second end of the connecting rod is rotatably connected to the dipper arm through a second swing arm.

[0038] The quick connection device of the embodiments of the present disclosure can enable the position retaining member to reliably engage the locking hook with the main locking hook within a first angular range, so that the main locking member is maintained in a first locked state, improving the reliability of the connection between the tool and the mounting base, and improving the safety of the working machine during operation. Moreover, when the angle of the quick connection device changes and locking cannot be achieved by the action of gravity, the position retaining member automatically plays a position retaining role, eliminating the need for manual pin insertion for locking, reducing the risk of the tool falling off due to operation errors during operation, thereby improving operation safety. At the same time, the tool can be quickly installed or replaced, and the operator can replace the tool in the cab, reducing the operation difficulty and improving the efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0040] Figure 1 It is a schematic structural diagram of some embodiments of the excavator arm of the present disclosure.

[0041] Figure 2 It is a schematic structural diagram of some embodiments of the main locking member in the quick connection device of the present disclosure.

[0042] Figure 3 For Figure 2 the enlarged view at A in

[0043] Figure 4 It is a schematic diagram of the state of the quick connection device in the excavator at the first critical position.

[0044] Figure 5 For Figure 4 the enlarged view at B in

[0045] Figure 6 Schematic diagram of the quick connection device in the excavator reaching the first unlocking state when in the second critical position.

[0046] Figure 7 For Figure 6 The enlarged view at position C in

[0047] Figure 8 Side view of some embodiments of the secondary locking component in the quick connection device of the present disclosure when in the second locked state.

[0048] Figure 9 Stereogram of some embodiments of the secondary locking component in the quick connection device of the present disclosure when in the second locked state.

[0049] Figure 10 Side view of some embodiments of the secondary locking component in the quick connection device of the present disclosure when in the second unlocked state.

[0050] Figure 11 Side view of some embodiments of the secondary locking component in the quick connection device of the present disclosure when in the second unlocked state.

[0051] Figure 12 Structural schematic diagram of some other embodiments of the secondary locking component.

[0052] Explanation of reference numerals

[0053] 1. Main locking hook; 13. Hook portion; 2. First pin shaft; 3. First hinge pin; 4. Locking hook; 41. Hook body; 42. Hook claw; 43. Third pin shaft; 5. First linear driving component; 6. Second pin shaft; 7. Second hinge pin; 8. Spring pressing plate; 81. Straight plate section; 82. Bush; 83. Arc plate section; 91. First rocker arm; 92. Link rod; 93. Stop iron; 94. Fifth pin shaft; 95. Oil passage; 96. Slide rod; 97. Universal joint; 31. Housing; 32. Secondary locking hook; 33. Locking pin; 34. Limiting block; 35. Elastic element; 36. Fourth pin shaft; X. Preset direction

[0054] 10. Bucket arm; 11. First connecting pin; 12. Second connecting pin; 20. Bucket; 21. Main pin shaft; 22. Secondary pin shaft; 30. Quick connection device; 31. Outer shell; 3A. Main locking component; 3B. Secondary locking component; 40. Connecting rod; 50. Second rocker arm; 60. Second linear driving component. Detailed implementation manners

[0055] Next, the technical solutions in the embodiments of the present disclosure will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present disclosure and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present disclosure without creative efforts belong to the scope of protection of the present disclosure.

[0056] Techniques, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods, and devices should be regarded as part of the specification.

[0057] In the description of the present disclosure, it should be understood that the orientation or positional relationship indicated by the terms "center", "lateral", "longitudinal", "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the scope of protection of the present disclosure.

[0058] In the description of the present disclosure, it should be understood that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Without further statement, the above terms have no special meaning, and thus should not be construed as limiting the scope of protection of the present disclosure.

[0059] The inventors found that the main reason for the poor safety of the hydraulic quick connector in the related art is that the clamping range of the movable hook is limited and the clamping property is not strong. The connecting pin shaft is in a semi-exposed state. After the movable hook is connected to the machine tool, the operator needs to manually insert a safety pin from the side to ensure that the movable hook is locked and prevent the operating device from falling off due to operating errors or hydraulic system failures during the operation. However, due to manual pin insertion, there may be a situation where the operator forgets to insert the pin, resulting in an accident. Moreover, the safety pin is vacant for a long time and is extremely easy to lose. Therefore, this kind of quick connector requires manual operation, which is time-consuming, and if the locking system is damaged, it will lead to accidents.

[0060] Therefore, the present disclosure provides a quick connection device. In some embodiments, such as Figures 1 to 11As shown, the quick-connecting device is used to detachably connect the implement to the mounting base. The implement is provided with a main pin shaft 21 extending along a preset direction X. For example, the implement of a construction machine is a working device, which can be a bucket, a breaker or a hydraulic shear, etc. By replacing different implements, the functions of the construction machine can be broadened. The preset direction X can be the width direction of the implement.

[0061] The quick-connecting device 30 includes a main locking member 3A. The main locking member 3A has a first locking state and a first unlocking state, and includes:

[0062] A main locking hook 1. The first end of the main locking hook 1 is rotatably connected to a first pin shaft 2 extending along the preset direction X. The second end of the main locking hook 1 is used to engage with the main pin shaft 21 in the first locking state;

[0063] A locking hook 4. The first end of the locking hook 4 is rotatably connected to a second pin shaft 6 extending along the preset direction X. The second end of the locking hook 4 is used to engage with the first end of the main locking hook 1 in the first locking state; and

[0064] A position holding member, which is rotatably connected to the second pin shaft 6 and is used to keep the locking hook 4 in the locked position when the quick-connecting device 30 rotates within a first angular range. The locking hook 4 has a tendency to disengage from the main locking hook 1 under the action of gravity within the first angular range.

[0065] Wherein, the main locking hook 1 can be in an L-shaped structure and form an acute-angled accommodating space for placing the first pin shaft 2. The first end of the main locking hook 1 is provided with a hook portion 13. The main locking hook 1 rotates around the first pin shaft 2 to be in the first locking state when engaging with the main pin shaft 21, and is in the first unlocking state when disengaging from the main pin shaft 21. The main locking hook 1 can also adopt other structures.

[0066] As Figure 5 shown, the locking hook 4 includes a hook body 41 and a hook claw 42 connected to form an L-shaped structure. The hook body 41 is rotatably connected to the second pin shaft 6. The hook body 41 can be in a plate-like structure with a gradually decreasing thickness from the second pin shaft 6 to the hook claw 42; the hook claw 42 is used to engage with the main locking hook 1. Specifically, the hook claw 42 is used to engage with the hook portion 13. The locking hook 4 can also adopt other structures.

[0067] The position retainer is rotatably connected to the second pin shaft 6, and the position retainer and the locking hook 4 are arranged side by side along the length direction of the second pin shaft 6. When the quick connection device 30 is rotated to the first angle range, the locking hook 4 cannot be pressed on the main lock hook 1, and cannot rely on gravity to achieve engagement with the main lock hook 1. In the first angle range, the locking hook 4 and the main lock hook 1 have a tendency to disengage. By setting the position retainer, the locking hook 4 and the main lock hook 1 can be kept engaged, so that the main lock component 3A is kept in the first locking state. Taking an excavator as an example, the amplitude change of the boom 10 and the swing of the bucket 20 relative to the boom 10 will cause the quick connection device 30 to rotate.

[0068] This embodiment, by providing a locking hook 4 and a position retaining member, can make the position retaining member reliably keep the locking hook 4 and the main lock hook 1 engaged within the first angle range, so that the main lock component 3A is kept in the first locking state, improving the reliability of the connection between the machine and the mounting base, so as to improve the safety of the working machine operation. Moreover, when the angle of the quick connection device 30 changes and cannot be locked by gravity, the position retaining member automatically plays a position retaining role, and no manual latch is required to achieve locking, which can reduce the machine falling off caused by operating errors during operation, thereby improving the safety of operation, and can also quickly install or replace the machine, and the operator can replace the machine in the cab, which can reduce the difficulty of operation and improve efficiency.

[0069] In some embodiments, Figure 2 As shown, the position retaining member includes a spring pressure plate 8, which is arranged side by side with the locking hook 4 along the second pin shaft 6. The first end of the spring pressure plate 8 is used to resist the mounting base within a first angle range, and the second end of the spring pressure plate 8 is used to apply a force to the locking hook 4 so that the locking hook 4 is engaged with the main locking hook 1.

[0070] The spring pressure plate 8 can be a plate-like structure with elasticity, for example, a metal material. Outside the first angle range, the first end of the spring pressure plate 8 can be separated from the mounting base, and the locking hook 4 is engaged with the main locking hook 1 by its own gravity.

[0071] For example, the implement includes a bucket 20, the mounting base includes a boom 10 and a connecting rod 40, the bucket 20 is connected to the first end of the boom 10 and the first end of the connecting rod 40 through a quick connection device 30, and the second end of the connecting rod 40 is rotatably connected to the boom 10 through a second rocker arm 50. The first end of the spring pressure plate 8 can abut against the area of the side of the first end of the boom 10 facing the connecting rod 40.

[0072] In this embodiment, a spring pressing plate 8 is used as a position retaining member, and the spring pressing plate 8 can be set to a required length according to the position to be abutted, so that the spring pressing plate 8 can flexibly abut against a suitable position of the mounting base; moreover, after the first end of the spring pressing plate 8 contacts the mounting base, the spring pressing plate 8 can be deformed to adapt to the quick-connecting device 30 rotating to different angles, and the locking hook 4 can be reliably held in the engaged position with the main locking hook 1 by applying an elastic force.

[0073] In some embodiments, as Figure 2 shown, the locking hook 4 is provided with a third pin shaft 43 at a position near its second end, the third pin shaft 43 extends beyond the side surface of the locking hook 4 along a preset direction X, and the second end of the spring pressing plate 8 abuts against the length section of the third pin shaft 43 extending beyond the locking hook 4.

[0074] Among them, the third pin shaft 43 can extend along the preset direction X, and the third pin shaft 43 is arranged at one end of the hook body 41 close to the hook claw 42, so as to apply a force to the locking hook 4 through the second end of the spring pressing plate 8 and increase the force arm to obtain a larger acting force.

[0075] This embodiment can apply a force to the third pin shaft 43 through the spring pressing plate 8, thereby applying the force to the locking hook 4. In this way, there is sufficient space on the side surface of the locking hook 4 to arrange the spring pressing plate 8, and a better force application angle can be obtained, improving the reliability of the engagement between the locking hook 4 and the main locking hook 1.

[0076] In some embodiments, as Figure 2 shown, the spring pressing plate 8 includes: a bushing 82 sleeved on the second pin shaft 6; a straight plate section 81 connected to one side of the bushing 82 for applying a force to the locking hook 4; and an arc plate section 83 connected to the other side of the bushing 82, and the free end of the arc plate section 83 abuts against the mounting base through the side surface far from the center of curvature.

[0077] Among them, the length of the arc plate section 83 can be greater than that of the straight plate section 81, so that the arc plate section 83 abuts against a suitable position on the mounting base. The part of the arc plate section 83 close to the bushing 82 can have a relatively straight structure, and the part far from the bushing 82 can be arc-shaped, such as circular arc-shaped. The included angle between the straight plate section 81 and the arc plate section 83 can be an obtuse angle.

[0078] This embodiment can conveniently install the spring pressing plate 8 on the second pin shaft 6, and design the lengths and angles of the straight plate section 81 and the arc plate section 83 according to the position for abutting on the mounting base and the position for applying a force to the locking hook 4, which can not only flexibly meet the design requirements but also reliably achieve locking.

[0079] In some embodiments, as Figure 4 and Figure 5As shown, the locking hook 4 includes a hook body 41 and a hook claw 42 that are connected to form an L-shaped structure. The hook body 41 is rotatably connected to the second pin shaft 6, and the hook claw 42 is used to engage with the main locking hook 1. Among them, when the locking hook 4 rotates to the position where the hook body 41 extends vertically upward, it is the first critical position, and the first angular range is the angular range between the first critical position and the position of the locking hook 4 when it rotates to the limit position in the direction away from the hook claw 42.

[0080] Specifically, the hook claw 42 is used to engage with the hook portion 13 of the main locking hook 1. When the locking hook 4 rotates to the position where the hook body 41 extends vertically upward, if the quick connection device 30 continues to rotate in the opposite direction of the hook claw 42 (i.e., Figure 4 the clockwise direction in ), the locking hook 4 will be disengaged from the main locking hook 1 under the action of gravity. Starting from the first critical position, the position of the locking hook 4 is maintained by the position maintaining member, which can prevent the locking hook 4 from being disengaged from the engaged state with the main locking hook 1. When the quick connection device 30 continues to rotate in the direction away from the hook claw 42 starting from the first critical position, due to the limitation of the movement range of the machine tool and the installation base, there is also a limit position when the locking hook 4 rotates in the direction away from the hook claw 42.

[0081] It should be noted that "vertically upward" and "vertically downward" only represent approximate positions. Due to the influence of the structure of the locking hook 4, there will be a position deviation at the critical position.

[0082] Taking an excavator as an example, as Figure 4 shown, when the locking hook 4 is in the first critical position, the bucket 20 is located in front of the boom 10, and the first end of the spring pressing plate 8 begins to contact the position of the boom 10 close to the first end. In the case where the boom 10 rotates upward or the bucket 20 swings outward, the locking hook 4 will continue to rotate clockwise until it rotates to the limit position. The angular range between the first critical position and the limit position is the first angular range.

[0083] In some embodiments, the locking hook 4 is used to press above the main locking hook 1 within a second angular range, so as to keep the main locking hook 1 in the locked position by relying on its own gravity. In this embodiment, within the second angular range, the main locking hook 1 can be kept in the locked position only by the gravity of the locking hook 4 without relying on the position maintaining member, which can increase the allowable rotation range of the quick connection device 30.

[0084] In some embodiments, as Figure 6 and Figure 7 shown, the locking hook 4 includes a hook body 41 and a hook claw 42 that are connected to form an L-shaped structure. The hook body 41 is connected to the second pin shaft 6, and the hook claw 42 is used to engage with the main locking hook 1; among them, when the locking hook 4 rotates to the position where the hook body 41 extends vertically upward, it is the first critical position, and when the hook body 41 extends vertically downward, it is the second critical position. The second angular range is the angular range between the first critical position and the second critical position.

[0085] Specifically, when the locking hook 4 rotates to the position where the hook body 41 extends vertically downward, if the quick connection device 30 continues to rotate in the extending direction of the hook claw 42 (i.e., Figure 7 the counterclockwise direction in ), the main locking hook 1 will move separately in the direction away from the locking hook 4, causing the main locking hook 1 to disengage from the locking hook 4. During the process of rotating from the first critical position to the second critical position in the extending direction of the hook claw 42, and during the process of rotating from the second critical position to the first critical position in the direction away from the extending direction of the hook claw 42, the main locking hook 1 can be held in the locked position by relying on the gravity of the locking hook 4. This angular range is about 180°.

[0086] In some embodiments, as Figure 6 and Figure 7 shown, the locking hook 4 includes a hook body 41 and a hook claw 42 that are connected to form an L-shaped structure. The hook body 41 is connected to the second pin shaft 6, and the hook claw 42 is used for engaging with the main locking hook 1. Among them, when the locking hook 4 rotates to the position where the hook body 41 extends vertically downward, it is the second critical position, and the main locking component 3A is in the first unlocking state when the main locking hook 1 rotates to the second critical position.

[0087] Specifically, when the locking hook 4 rotates to the position where the hook body 41 extends vertically downward, if the quick connection device 30 continues to rotate in the extending direction of the hook claw 42 (i.e., Figure 7 the counterclockwise direction in ), the main locking hook 1 will move separately in the direction away from the locking hook 4, causing the main locking hook 1 to disengage from the locking hook 4. Therefore, the second critical position can be used as the unlocking position of the main locking component 3A, and the machine tool is only allowed to be unlocked when it rotates to the second critical position.

[0088] Taking an excavator as an example, as Figure 7 shown, when the locking hook 4 is in the second critical position, the bucket 20 is in the retracted state relative to the arm 10, and the first end of the spring pressing plate 8 disengages from the arm 10. When the bucket 20 continues to retract, the main locking hook 1 will disengage from the locking hook 4, and the bucket 20 is only allowed to be unloaded at this position.

[0089] The quick connection device of the present disclosure can control its locking and unlocking by using the change of the center of gravity of the locking hook 4. The locking hook 4 is locked by the position holding member within the first angular range, and the locking hook 4 is locked by the gravity of the locking hook 4 within the second angular range. The main locking component 3A controls the unlocking range within a certain area through the change of the center of gravity of the locking hook 4 and the position holding member, which can improve the safety of the machine tool use.

[0090] In some embodiments, as Figure 2 shown, the quick connection device further includes a first linear driving member 5. Its first end is hinged to the mounting base, and the second end is hinged to the main locking hook 1. The first linear driving member 5 is used to drive the main locking hook 1 to cooperate with and separate from the main pin shaft 21. AsFigure 8 As shown, the first linear drive member 5 is an oil cylinder, and a pipeline 95 is provided on the oil cylinder.

[0091] Specifically, the first end of the first linear drive member 5 is hinged to the mounting base through a second hinge pin 7, and the second end is hinged to the main locking hook 1 through a first hinge pin 3, for example, hinged to the bent area of the L-shaped main locking hook 1. When the first linear drive member 5 retracts, the separation between the main locking hook 1 and the main pin shaft 21 can be achieved, and when it extends, the cooperation between the main locking hook 1 and the main pin shaft 21 can be achieved.

[0092] In this embodiment, by providing the first linear drive member 5, the operator can install and replace the implement through quick change in the cab, and automatically achieve locking and unlocking, which can realize the convenience of operation and improve the operation safety and efficiency.

[0093] In some embodiments, as Figures 8 to 11 shown, the implement is provided with a secondary pin shaft 22 extending along a preset direction X. The quick connection device 30 includes a secondary locking member 3B, and the secondary locking member 3B has a second locking state and a second unlocking state. When the main locking member 3A is in the first unlocking state, the secondary locking member 3B remains in the second locking state.

[0094] In this embodiment, by providing two sets of independent locking systems, both locks are mechanical locks, and the locking and unlocking are independent. When the main locking member 3A is damaged or in the first unlocking state, the secondary locking member 3B can still play a locking role, which can improve the reliability of the connection between the implement and the mounting base and improve the safety of construction machinery operation.

[0095] In some embodiments, in the preset direction X, the main locking member 3A and the secondary locking member 3B are arranged side by side. Specifically, the main locking member 3A is mainly locked through a position retaining member such as a spring pressing plate 8, and the secondary locking member 3B is mainly locked through a locking mechanism such as a four-bar linkage mechanism in the following embodiment. These two sets of locking structures are located on both sides of the locking hook 4 along the second pin shaft 6, which can be independent of each other in structure, improve the reliability of locking and unlocking, and are easy to layout the main locking member 3A and the secondary locking member 3B.

[0096] In some embodiments, as Figure 8 and Figure 9 shown, the secondary locking member 3B includes:

[0097] A secondary locking hook 32, the first end of the secondary locking hook 32 is rotatably connected to a fourth pin shaft 36 extending along the preset direction X, and the second end of the secondary locking hook 32 is used to engage with the secondary pin shaft 22 in the second locking state; and

[0098] A locking mechanism is used to keep the secondary locking hook 32 in the locked position when the main locking hook 1 and the main pin shaft 21 are within a predetermined disengagement range and the main locking hook 1 does not exert a force on the main pin shaft 21.

[0099] Among them, the secondary locking hook 32 can be a C-shaped structure, which has an accommodating area for placing the secondary pin shaft 22. The secondary pin shaft 22 and the main pin shaft 21 are arranged at intervals, serving as two different mounting positions on the machine tool. As Figure 8 shown, if there is a disengagement between the main locking hook 1 and the main pin shaft 21, but still within the predetermined disengagement range, the outer side of the main locking hook 1 does not contact or does not exert a force when contacting the locking mechanism, and the locking structure does not act, still keeping the secondary locking hook 32 in the locked position.

[0100] In this embodiment, even when the main locking component 3A is damaged and there is a slight disengagement between the main locking hook 1 and the main pin shaft 21, the secondary locking hook 32 can still be kept in the locked position by the locking mechanism, which can improve the reliability of the connection between the machine tool and the mounting base.

[0101] Furthermore, as Figure 8 shown, the quick connection device 30 can include a housing 31, and both the main locking component 3A and the secondary locking component 3B are arranged inside the housing 31. By providing the housing 31, not only can the internal structure of the quick connection device 30 be protected, but also due to the structural limitation of the housing 31, the main locking hook 1 can move at most to Figure 8 the position shown in the figure where it is about to contact the locking mechanism. The housing 31 is used to define the predetermined disengagement range of the main locking hook 1 relative to the main pin shaft 21.

[0102] In some embodiments, as Figure 8 and Figure 9 shown, the locking mechanism is a four-bar linkage mechanism and includes:

[0103] A first rocker arm 91, the first end of the first rocker arm 91 is rotatably connected to the second pin shaft 6;

[0104] A stop 93, the first end of the stop 93 is rotatably connected to the fifth pin shaft 94 extending along the preset direction X, and the second end of the stop 93 is used to achieve locking when abutting against the secondary locking hook 32; and

[0105] A connecting rod 92, the first end of the connecting rod 92 is rotatably connected to the second end of the first rocker arm 91, and the second end of the connecting rod 92 is rotatably connected to the stop 93.

[0106] Among them, the four-bar linkage mechanism and the spring pressing plate 8 are respectively located on both sides of the locking hook 4 and are structurally independent of each other. The first rocker arm 91 and the hook body 41 can form an obtuse angle. A frame of the four-bar structure is formed between the second pin shaft 6 and the fifth pin shaft 94.

[0107] In this embodiment, the four-bar linkage can reliably lock and unlock the secondary locking member 3B, and has a simple structure. When unlocking is required, it is convenient to apply a driving force to the four-bar linkage, and locking is achieved when the second end of the detent 93 abuts against the secondary locking hook 32.

[0108] In some other embodiments, as Figure 12 shown, the locking mechanism can be a slide bar mechanism. The slide bar mechanism includes a slide bar 96 and a universal joint 97. The universal joint 97 is sleeved on the slide bar 96. The universal joint 97 is movable on the slide bar 96 and can change its angular position. The universal joint 97 is rotatably mounted on the housing 31. When unlocking is required, a force can be applied to the end of the slide bar 96 away from the detent 93 through the main locking hook 1. When the slide bar 96 is pushed to move, the universal joint 97 changes its position on the slide bar 96 and its own angle, and the slide bar 96 can push the detent 93 away from the locking position to release the locking of the secondary locking hook 32.

[0109] In some embodiments, as Figure 8 shown, the first end of the connecting rod 92 extends a preset distance relative to the first rocker arm 91, and is used to receive the unlocking force applied by the main locking hook 1 when it exceeds the predetermined disengagement range.

[0110] In this embodiment, when the main locking hook 1 and the main pin shaft 21 are within the predetermined disengagement range, the positions Q of the main locking hook 1 and the connecting rod 92 do not contact, and the unlocking force cannot be applied to the connecting rod 92. Locking is achieved when the second end of the detent 93 abuts against the secondary locking hook 32 at position P; when the main locking hook 1 and the main pin shaft 21 exceed the predetermined disengagement range, the main locking hook 1 contacts the connecting rod 92 at position Q and applies a driving force to the connecting rod 92 to make the four-bar linkage move. When moving to Figure 10 and Figure 11 the positions shown, the position P of the second end of the detent 93 leaves the secondary locking hook 32, realizing the unlocking of the secondary locking hook 32.

[0111] When unlocking the quick-connect device 30, it is first necessary to rotate it to the second critical position to make the main locking member 3A in the first unlocking state. At this time, then control the first linear drive member 5 to retract, so that the main locking hook 1 moves in a direction away from the main pin shaft 21 to drive the four-bar linkage to move, so that the second end of the detent 93 leaves the secondary locking hook 32, so that the secondary locking member 3B is in the second unlocking state. Then, continue to retract the first linear drive member 5, and the separation of the implement from the quick-connect device 30 can be achieved.

[0112] In some embodiments, the second end of the connecting rod 92 is rotatably connected to the middle area of the detent 93. The second end of the detent 93 is used to abut against the secondary locking hook 32 to keep the secondary locking hook 32 in the locked position. This structure can make the second end of the detent 93 extend out of the connection area with the connecting rod 92 to apply a locking force to the secondary locking hook 32.

[0113] In some embodiments, the secondary locking member 3B further includes a locking pin 33 disposed on the side of the detent 93 facing the main locking hook 1 for holding the detent 93 in a position where the secondary locking hook 32 is locked; and / or the secondary locking member 3B further includes an elastic element 35 disposed between the detent 93 and the fifth pin shaft 94 for holding the detent 93 in a position where the secondary locking hook 32 is locked.

[0114] Wherein, the locking pin 33 can extend along a preset direction X. When the secondary locking member 3B is in the second locked state, the locking pin 33 can prevent the detent 93 from rotating towards the direction close to the main locking hook 1. Specifically, in the second locked state, the detent 93 and the secondary locking hook 32 are in contact with each other at position P to generate pressure. Since the normal line of the contact surface at this time is in the upper left direction, the detent 93 generates a clockwise torque around the fifth pin shaft 94. Blocked by the locking pin 33, the detent 93 cannot rotate. By providing the elastic element 35, such as a torsion spring, the rotation of the detent 93 can also be prevented to maintain it in the locked position.

[0115] In some embodiments, as Figure 8 and Figure 9 shown, the secondary locking member 3B further includes a limiting block 34 for limiting the extreme position of the secondary locking hook 32 so that the secondary locking hook 32 is maintained in a posture convenient for the secondary pin shaft 22 to be inserted.

[0116] In this embodiment, by providing the limiting block 34, even if the secondary pin shaft 22 is not inserted into the secondary locking hook 32, the secondary locking hook 32 can still be maintained in the current position. When it is necessary to install the tool, the secondary pin shaft 22 can smoothly enter the secondary locking hook 32, which is beneficial to realizing the automatic installation and replacement of the tool.

[0117] Secondly, the present disclosure provides a construction machine including a mounting base, a tool, and the quick connection device 30 of the above embodiment, and the quick connection device 30 detachably connects the tool to the mounting base.

[0118] The construction machine of this embodiment can quickly and flexibly install or replace the tool through the quick connection device 30, which is beneficial to broadening the functions of the construction machine. Moreover, after the tool is installed, there is no need to manually insert a pin for locking, which can reduce the accidental detachment of the tool caused by operation errors during the operation, thereby improving the operation safety. Moreover, the operator can replace the tool in the cab, which can reduce the operation difficulty when replacing the tool and improve the efficiency.

[0119] In some embodiments, as Figure 1As shown, the construction machinery is an excavator, the tool includes a bucket 20, the mounting base includes a boom 10 and a connecting rod 40, the bucket 20 is connected to the first end of the boom 10 and the first end of the connecting rod 40 through a quick connection device 30, and the second end of the connecting rod 40 is rotatably connected to the boom 10 through a second swing arm 50.

[0120] Further, the excavator may further include a second linear drive member 60, such as a hydraulic cylinder, etc. The first end of the second linear drive member 60 is rotatably connected to the second end of the connecting rod 40. The second linear drive member 60, the connecting rod 40 and the second swing arm 50 are hinged at the same point, and the second end of the second linear drive member 60 is rotatably connected to the second end of the boom 10.

[0121] Taking the excavator as an example below, the working principle of the quick connection device 30 of the present disclosure will be described.

[0122] As Figure 2 shown, the main lock member 3A is in the first locked state. In the normal working state, the first linear drive member 5 pushes the main lock hook 1 to rotate around the first pin shaft 2 through the first hinge pin 3 to clamp the main pin shaft 21. When the first linear drive member 5 loses power, the main lock hook 1 will rotate in the loosening direction under the action of the main pin shaft 21. At this time, the locking hook 4 rotates around the second pin shaft 6 under the action of gravity and hooks the hook portion 13 of the main lock hook 1, as Figure 3 shown. At this time, the main lock hook 1 cannot be opened, and the bucket 20 is locked.

[0123] During the luffing movement of the boom 10 and the swinging of the bucket 20, the quick connection device 30 will be rotated to different positions. The locking hook 4 is separated from the main lock hook 1 due to the change of the center of gravity position. The F end of the spring pressing plate 8 rotates around the second pin shaft 6 under the pressure of the boom 10 and presses the third pin shaft 43. The third pin shaft 43 moves synchronously with the locking hook 4. The spring pressing plate 8 is stressed to press the third pin shaft 43, so that the locking hook 4 hooks the main lock hook 1, making the main lock hook 1 unable to rotate, thus avoiding the unlocking of the main lock hook 1 caused by some inappropriate working positions.

[0124] Figure 4 and Figure 5 shown, when the quick connection device 30 and the boom 10 are in the illustrated position, if the quick connection device 30 rotates clockwise around the boom 10 at this time, the center of gravity of the locking hook 4 is about to reach the right side of the second pin shaft 6, and the locking hook 4 will rotate clockwise resulting in the unlocking of the main lock member 3A. At this position, the hook body 41 of the locking hook 4 extends vertically upward, being in the first critical position. At this time, the first end of the spring pressing plate 8 comes into contact with the boom 10 and rotates counterclockwise around the second pin shaft 6. The second end of the spring pressing plate 8 presses the locking hook 4 through the third pin shaft 43, making the main lock hook 1 unable to rotate so as to achieve the locking effect.

[0125] When Figure 4 the quick-connect device 30 rotates counterclockwise to Figure 6 and Figure 7 the position, at this time the locking hook 4 is about to rotate clockwise under the influence of gravity. Continuing to rotate the quick-connect device 30 counterclockwise causes the locking hook 4 to separate from the main locking hook 1 and unlock. Although the main locking component 3A is unlocked at this position, the safety is still ensured because the locking mouth of the secondary locking hook 32 of the secondary locking component 3B faces upward. When the first linear drive component 5 contracts in this state of the quick-connect device 30, the main locking hook 1 opens, and then the machine tool is replaced by adjusting the posture.

[0126] The quick-connect device 30 controls the unlocking range within a certain area through the change of the center-of-gravity position of the locking hook 4 and the spring pressure plate 8, improving the safety of use.

[0127] As Figure 8 and Figure 9 shown, the end stroke of the first linear drive component 5 is used to control the unlocking of the secondary locking component 3B. When the locking structure of the main locking component 3A is damaged, the main locking hook 1 rotates counterclockwise around the first pin shaft 2 under the influence of the main pin shaft 21. Due to the structural limitation of the housing 31 of the quick-connect device 30, at this time the main locking hook 1 reaches at most the position shown in the figure. At this time, the main locking hook 1 just contacts the connecting rod 92 at the position Q. The connecting rod 92, the second pin shaft 6, the first rocker arm 91, the fifth pin shaft 94 and the stop iron 93 form a four-bar linkage mechanism. When the main locking hook 1 does not contact the connecting rod 92, the four-bar linkage mechanism maintains the position shown in the figure under the action of the elastic element 35 and the locking pin 33. At this time, the secondary locking hook 32 contacts the limiting block 34 at the position P, so the secondary locking hook 32 cannot rotate counterclockwise around the fourth pin shaft 36. Therefore, the secondary locking component 3B remains locked without being affected by the main locking component 3A. At the same time, due to the existence of the limiting block 34, even if the secondary pin shaft 22 is not embedded in the secondary locking hook 32, the secondary locking component 3B can still maintain its current position to prevent the secondary pin shaft 22 from not being able to enter the secondary locking hook 32.

[0128] As Figure 10 and Figure 11 shown, when it is necessary to actively release the secondary locking component 3B, the first linear drive component 5 needs to be contracted to the end. At this time, the main locking hook 1 contacts the connecting rod 92 and drives the connecting rod 92 to move to the right. Due to the existence of the four-bar linkage mechanism, the stop iron 93 also rotates counterclockwise to the position shown in the figure. At this time, the secondary locking hook 32 loses its restriction and can rotate counterclockwise around the fourth pin shaft 36 to the current position under the pressure of the secondary pin shaft 22. At this time, the secondary pin shaft 22 can withdraw from the secondary locking hook 32. Thus, the separation of the bucket 20 and the quick-connect device 30 can be realized.

[0129] ​This embodiment designs the main lock using a hook lock and the secondary lock using a squeeze lock; and controls the locking and unlocking of the locking hook 4 by utilizing the change in the center of gravity of the locking hook 4, the relative positional relationship between the dipper arm 10 and the quick coupling device 30, and locking the locking hook 4 through the spring pressure plate 8; and independently controls the locking and unlocking of the secondary lock component 3B by forming a driving four-bar linkage mechanism at the end of the first linear driving component 5. This solution has at least the following advantages:

[0130] 1. When the first linear driving component 5 fails, the quick coupling device 30 and the implement will not separate.

[0131] 2. The quick coupling device 30 can only be unlocked at a fixed position, effectively improving the safety of the quick coupler.

[0132] 3. By adopting a double-lock structure, there is no direct linkage relationship between the two locks. Damage to the main lock component 3A will not cause the secondary lock component 3B to unlock, effectively improving the safety of the quick coupling device 30.

[0133] 4. The driver can directly complete the combination or separation of the quick coupling device 30 and the implement in the cab independently.

[0134] 5. This double-lock quick-change structure can be directly matched with ordinary buckets of corresponding tonnages without the need to produce special buckets.

[0135] 6. There is room to increase the material size in this structure, which can effectively improve the structural strength.

[0136] The above are only exemplary embodiments of the present disclosure and are not intended to limit the present disclosure. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present disclosure shall be included within the protection scope of the present disclosure.

Claims

1. A quick connection device, characterized in that, For connecting a tool to a mounting base, the tool is provided with a main pin shaft (21) extending along a preset direction (X); The quick connection device (30) includes a main locking component (3A), the main locking component (3A) having a first locking state and a first unlocking state, and comprising: A main locking hook (1), a first end of the main locking hook (1) being rotatably connected to a first pin shaft (2) extending along the preset direction (X), a second end of the main locking hook (1) being adapted to engage with the main pin shaft (21) in the first locking state; A locking hook (4), a first end of the locking hook (4) being rotatably connected to a second pin shaft (6) extending along the preset direction (X), a second end of the locking hook (4) being adapted to engage with the first end of the main locking hook (1) in the first locking state; and A position holding member, rotatably connected to the second pin shaft (6), for keeping the locking hook (4) in a locked position when the quick connection device (30) rotates within a first angular range, the locking hook (4) having a tendency to disengage from the main locking hook (1) under the action of gravity within the first angular range; The position holding member includes a spring pressing plate (8), the spring pressing plate (8) being arranged side by side with the locking hook (4) along the second pin shaft (6), a first end of the spring pressing plate (8) being adapted to abut against the mounting base within the first angular range, a second end of the spring pressing plate (8) being adapted to apply a force to the locking hook (4) so that the locking hook (4) engages with the main locking hook (1); The spring pressing plate (8) includes: A bushing (82), sleeved on the second pin shaft (6); A straight plate section (81), connected to one side of the bushing (82), for applying a force to the locking hook (4); and An arc plate section (83), connected to the other side of the bushing (82), a free end of the arc plate section (83) abutting against the mounting base through a side surface away from the center of curvature.

2. The quick connection device according to claim 1, characterized in that, The locking hook (4) is provided with a third pin shaft (43) near its second end, the third pin shaft (43) extending beyond the side surface of the locking hook (4) along the preset direction (X), and a second end of the spring pressing plate (8) abuts against a length section of the third pin shaft (43) extending beyond the locking hook (4).

3. The quick connection device according to claim 1, characterized in that, The locking hook (4) includes a hook body (41) and a hook claw (42) connected to form an L-shaped structure, the hook body (41) being connected to the second pin shaft (6), the hook claw (42) being adapted to engage with the main locking hook (1); Wherein, when the locking hook (4) rotates to a first critical position where the hook body (41) extends vertically upward, the first angular range is an angular range between the first critical position and a position where the locking hook (4) is located when the locking hook (4) rotates to an extreme position in a direction away from the hook claw (42).

4. The quick connection device according to claim 1, characterized in that The locking hook (4) is adapted to press above the main locking hook (1) within a second angular range to keep the main locking hook (1) in a locked position by its own gravity.

5. The quick connection device according to claim 4, characterized in that, The locking hook (4) includes a hook body (41) and a hook claw (42) connected to form an L-shaped structure. The hook body (41) is connected to the second pin shaft (6), and the hook claw (42) is used to engage with the main locking hook (1). Wherein, when the locking hook (4) rotates to a first critical position where the hook body (41) extends vertically upward, and to a second critical position where the hook body (41) extends vertically downward, the second angle range is the angle range between the first critical position and the second critical position.

6. The quick connection device according to claim 1, characterized in that, The locking hook (4) includes a hook body (41) and a hook claw (42) connected to form an L-shaped structure. The hook body (41) is connected to the second pin shaft (6), and the hook claw (42) is used to engage with the main locking hook (1). Wherein, when the locking hook (4) rotates to the second critical position where the hook body (41) extends vertically downward, the main locking component (3A) is in the first unlocking state when the main locking hook (1) rotates to the second critical position.

7. The quick connection device according to claim 1, characterized in that, It further includes a first linear driving component (5), whose first end is hinged to the installation base body, and the second end is hinged to the main locking hook (1). The first linear driving component (5) is used to drive the main locking hook (1) to cooperate with and separate from the main pin shaft (21).

8. The quick connection device according to any one of claims 1 to 7, characterized in that, The machine tool is provided with a secondary pin shaft (22) extending along the preset direction (X). The quick connection device (30) includes a secondary locking component (3B). The secondary locking component (3B) has a second locking state and a second unlocking state. When the main locking component (3A) is in the first unlocking state, the secondary locking component (3B) remains in the second locking state.

9. The quick connection device according to claim 8, wherein, In the preset direction (X), the main locking component (3A) and the secondary locking component (3B) are arranged side by side.

10. The quick connection device according to claim 8, characterized in that, The secondary locking component (3B) includes: A secondary locking hook (32), the first end of the secondary locking hook (32) is rotatably connected to a fourth pin shaft (36) extending along the preset direction (X), and the second end of the secondary locking hook (32) is used to engage with the secondary pin shaft (22) in the second locking state; and A locking mechanism, which is used to keep the secondary locking hook (32) in the locked position when the main locking hook (1) and the main pin shaft (21) are within a predetermined separation range and the main locking hook (1) does not exert a force.

11. The quick connection device according to claim 10, characterized in that, The locking mechanism is a four-bar linkage mechanism and includes: A first rocker arm (91), the first end of the first rocker arm (91) is rotatably connected to the second pin shaft (6); A stop iron (93), the first end of the stop iron (93) is rotatably connected to a fifth pin shaft (94) extending along the preset direction (X), and the second end of the stop iron (93) is used to achieve locking when it abuts against the secondary locking hook (32); and A connecting rod (92), the first end of the connecting rod (92) is rotatably connected to the second end of the first rocker arm (91), and the second end of the connecting rod (92) is rotatably connected to the stop iron (93).

12. The quick-connecting device according to claim 11, characterized in that, The first end of the connecting rod (92) extends a preset distance relative to the first rocker arm (91) and is configured to receive an unlocking force applied by the main locking hook (1) when it is beyond a predetermined disengaging range.

13. The quick connection device according to claim 11, wherein, The second end of the connecting rod (92) is rotatably connected to the middle area of the detent (93).

14. The quick-connecting device according to claim 11, wherein the secondary locking member (3B) further includes a locking pin (33) disposed on a side of the detent (93) facing the main locking hook (1) and configured to keep the detent (93) in a position where the secondary locking hook (32) is locked; and / or the secondary locking member (3B) further includes an elastic element (35) disposed between the detent (93) and the fifth pin shaft (94) and configured to keep the detent (93) in a position where the secondary locking hook (32) is locked.

15. The quick connection device according to claim 10, characterized in that, The secondary locking member (3B) further includes a limiting block (34), and the limiting block (34) is configured to limit the extreme position of the secondary locking hook (32) so that the secondary locking hook (32) is maintained in an attitude facilitating the insertion of the secondary pin shaft (22).

16. An engineering machinery, characterized in that, An installation base, a tool, and the quick-connecting device (30) according to any one of claims 1 to 15, wherein the quick-connecting device (30) connects the tool to the installation base.

17. The construction machinery according to claim 16, characterized in that, The construction machinery is an excavator, the tool includes a bucket (20), the installation base includes a dipper arm (10) and a connecting rod (40), the bucket (20) is connected to the first end of the dipper arm (10) and the first end of the connecting rod (40) through the quick-connecting device (30), and the second end of the connecting rod (40) is rotatably connected to the dipper arm (10) through a second rocker arm (50).

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