Quick connecting device and engineering machinery

Abstract

The invention discloses a quick connecting device and engineering machinery, and belongs to the technical field of engineering machinery. The quick connecting device comprises a shell, a hydraulic oil cylinder, a lock hook, a fixing mechanism and an executing mechanism. One end of the shell provided with the front claw serves as a front end, and the other end serves as a rear end; the lock hook is rotationally connected to the front end of the shell and is matched with the front hook claw to lock or unlock a front end pin shaft of the accessory; the executing mechanism comprises a first executing rod, a second executing rod and a transmission pin shaft; the fixing mechanism is arranged at the rear end of the shell, is used for fixing a pin shaft at the rear end of the accessory, and is matched with the executing mechanism to drive the lock hook to perform locking or unlocking operation; the hydraulic oil cylinder is in transmission connection with the fixing mechanism and used for driving the fixing mechanism to move back and forth along the shell. The front pin shaft of the accessory can be automatically locked, manual intervention and an additional driver are not needed, the accessory is effectively prevented from falling off, personal injury or object damage caused by falling of the accessory can be prevented, and therefore the working safety is greatly improved.

Description

Technical Field

[0001] The invention belongs to the technical field of engineering machinery, and in particular relates to a quick connection device and engineering machinery. Background Art

[0002] The quick-connect device is usually arranged at the end of the working device of the earth-moving machine to quickly replace various attachments. The quick-connect device has a mounting seat for engaging the first pin of the attachment on one side, and at least one engaging element capable of fixing the second pin of the attachment on the other side, and the engaging element can be moved between a release position and an engaging position for releasably engaging the second pin of the attachment.

[0003] However, if the engaging element is accidentally moved due to improper operation or malfunction, the connected attachment will be released, endangering the personnel in the work area. In order to prevent the attachment from falling and endangering personal safety, additional safety devices are generally used on the quick connection device, such as safety hooks, locking pin claws and other accessory safety elements, but this will increase the weight of the device and reduce work efficiency. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a quick connection device and engineering machinery that can automatically lock the front pin shaft of an attachment without manual intervention or an additional driver, thereby effectively preventing the attachment from falling off.

[0005] The present invention provides the following technical solutions: In a first aspect, a quick connection device is provided, comprising a shell and a hydraulic cylinder, a lock hook, a fixing mechanism and an actuator installed on the shell; the shell is provided with one end of a front hook as a front end and the other end as a rear end; the lock hook is rotatably connected to the front end of the shell, and cooperates with the front hook to lock or unlock the front end pin of the accessory; the actuator comprises a first actuator rod, a second actuator rod and a transmission pin, the first actuator rod and the second actuator rod are located on both sides of the lock hook, the transmission pin passes through the lock hook through a limiting groove in the lock hook, and the two ends of the transmission pin are respectively fixedly connected to the first actuator rod and the second actuator rod; the transmission pin is driven to move in the limiting groove by the first actuator rod and the second actuator rod , thereby driving the lock hook to lock or unlock; the fixing mechanism is arranged at the rear end of the shell, for fixing the rear end pin shaft of the attachment, and cooperating with the actuator to drive the lock hook to lock or unlock; the hydraulic cylinder is transmission-connected to the fixing mechanism, for driving the fixing mechanism to move forward and backward along the shell; when the fixing mechanism moves out of the shell, the distance between the fixing mechanism and the first actuator rod and the second actuator rod is not less than the distance the fixing mechanism moves out of the shell; during the forward movement, the fixing mechanism drives the first actuator rod and the second actuator rod to move forward to the unlocking position; during the backward movement of the fixing mechanism, the first actuator rod and the second actuator rod move backward to the locking position through the return spring.

[0006] As an optional technical solution of the present invention, the fixing mechanism includes a first locking pin, a second locking pin, a guide block, a first guide rod and a second guide rod; the first locking pin and the second locking pin are relatively arranged at the rear end of the shell, and are used to extend out of the shell and cooperate with the rear fixing seat of the shell to fix the rear end pin of the accessory; the guide block is connected to the middle part of the first locking pin and the second locking pin, and the first guide rod and the second guide rod are fixedly connected to the side of the guide block close to the front hook claw, and are arranged relatively to the first actuator rod and the second actuator rod, and are used to drive the first actuator rod and the second actuator rod to move forward.

[0007] As an optional technical solution of the present invention, the cylinder piston of the hydraulic cylinder is connected to the guide block through a first connecting pin, which is used to drive the guide block to move forward and backward along the shell, thereby driving the first locking pin shaft, the second locking pin shaft, the first guide rod and the second guide rod to move forward and backward.

[0008] As an optional technical solution of the present invention, the first locking pin and the second locking pin are respectively sleeved with a first return spring and a second return spring; one end of the first return spring and the second return spring are connected to the guide block, and the other end is connected to the shell, which is used to drive the first locking pin and the second locking pin to extend out of the shell when the hydraulic cylinder fails.

[0009] As an optional technical solution of the present invention, an indicator is installed on the side of the guide block to indicate the moving position of the guide block; when the cylinder piston drives the guide block to move to the front end, the indicator extends out of the shell; when the cylinder piston drives the guide block to move to the rear end, the indicator retracts into the shell.

[0010] As an optional technical solution of the present invention, a third return spring and a fourth return spring are respectively sleeved on the first actuating rod and the second actuating rod to drive the first actuating rod and the second actuating rod to move backward to the starting position.

[0011] As an optional technical solution of the present invention, the lock hook is provided with a pin shaft hole, the front end of the shell is provided with a lock hook fixing seat, and the lock hook passes through the pin shaft hole through a first pin shaft and is rotatably connected to the lock hook fixing seat.

[0012] As an optional technical solution of the present invention, the limit groove in the lock hook is V-shaped, and the limit groove includes a rear section groove and a front section groove; when the first actuator rod and the second actuator rod move backward to the locking position, the transmission pin shaft moves to the rear section groove, and during the movement, the lock hook is driven to rotate counterclockwise around the first pin shaft until the transmission pin shaft no longer moves, and at this time, the lock hook end position of the lock hook is higher than the lower surface of the front hook claw of the front hook claw to lock the front end pin shaft of the accessory; when the first actuator rod and the second actuator rod move forward to the unlocking position, the transmission pin shaft moves to the front section groove, and during the movement, the lock hook is driven to rotate clockwise around the first pin shaft until the transmission pin shaft no longer moves, and at this time, the lock hook end position of the lock hook is lower than the lower surface of the front hook claw of the front hook claw to unlock the front end pin shaft of the accessory.

[0013] In a second aspect, there is provided an engineering machinery comprising a working device, accessories and the quick connecting device described in the first aspect; the top of the quick connecting device is rotatably connected to the working device via a second pin shaft and a third pin shaft; the hydraulic cylinder is connected to the working device via a hydraulic pipeline transmission; the accessories are detachably connected to the quick connecting device.

[0014] As an optional technical solution of the present invention, when the accessory is connected to the quick connecting device, the front end pin of the accessory is fixed in the front hook and the lock hook, and the rear end pin of the accessory is fixed between the first locking pin, the second locking pin and the rear fixing seat of the shell.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The quick connection device provided by the present invention provides a limit groove in the lock hook, so that no matter how much external force the front pin shaft of the accessory exerts on the end of the lock hook, the front pin shaft lock hook will not be unlocked; by providing a fixing mechanism and an actuator, the front pin shaft of the accessory can be automatically locked without manual intervention and without the need for an additional driver, effectively preventing the accessory from falling off, and preventing personal injury or damage to objects caused by the falling of the accessory, thereby greatly improving work safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a bottom perspective view of a quick connect device according to an embodiment of the present invention; Figure 2 is a front end cross-sectional view of a quick connection device according to an embodiment of the present invention; Figure 3 is a side cross-sectional view of a quick connection device according to an embodiment of the present invention; Figure 4 is a top view of a quick connection device in an embodiment of the present invention; Figure 5 is a schematic diagram of the connection between the quick connection device and the working device in an embodiment of the present invention; Figure 6 is a schematic diagram of an engineering machine in an embodiment of the present invention; Figure 7 is a cross-sectional view of a bucket mounted with a quick connection device according to an embodiment of the present invention; Figure 8 is a cross-sectional view of the front pin shaft locking of the bucket installed with the quick connection device in the embodiment of the present invention; Fig. 9 is a cross-sectional view of a quick-connect device releasing a bucket in an embodiment of the present invention; Fig.10 is a cross-sectional view of the front pin shaft unlocking the bucket released by the quick connection device in the embodiment of the present invention; Fig.11 is a cross-sectional view of the first guide rod just contacting the first actuator rod in the embodiment of the present invention; Fig.12 It is a front pin locking cross-sectional view when the first guide rod just contacts the first actuator rod in the embodiment of the present invention.

[0017] The following are marked in the figure: 1, working device; 1.1, second pin shaft; 1.2, third pin shaft; 2, quick connection device; 3, housing; 3.1, locking hook fixing seat; 3.2, front hook claw; 3.2a, lower surface of front hook claw; 3.2b, upper surface of front hook claw; 3.3, rear fixing seat; 4, guide block; 4.1, first guide rod; 4.2, second guide rod; 5a, first locking pin shaft; 5b, second locking pin shaft; 6a, first actuator rod; 6b, second actuator rod; 7, hydraulic cylinder; 7.1, cylinder piston; 7. 2. Hydraulic pipeline; 8. Lock hook; 8a. Pin shaft hole; 8b. Limiting groove; 8b-1. Rear section groove; 8b-2. Front section groove; 8c. End of lock hook; 9a. First return spring; 9b. Second return spring; 10a. Third return spring; 10b. Fourth return spring; 11. First connecting pin; 12a. Second connecting pin; 12b. Third connecting pin; 13. First pin shaft; 14. Transmission pin shaft; 15. Bolt; 16. Bucket; 16.1. Bucket front pin shaft; 16.2. Bucket rear pin shaft; 17. Indicator. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0019] Example 1 This embodiment provides a quick connection device, such as Figure 1 and 4 As shown, it includes a housing 3 and a hydraulic cylinder 7, a locking hook 8, a fixing mechanism and an actuator installed on the housing 3.

[0020] like Figure 4 As shown, the housing is provided with one end of the front hook 3.2 as the front end and the other end as the rear end.

[0021] like Figure 1 and Figure 2 As shown, the lock hook 8 is rotatably connected to the front end of the housing 3, and cooperates with the front hook claw 3.2 to lock or unlock the front pin of the attachment. Specifically, the lock hook 8 is provided with a pin hole 8a, and the front end of the housing 3 is provided with a lock hook fixing seat 3.1. The lock hook 8 passes through the pin hole 8a through the first pin 13 and is rotatably connected to the lock hook fixing seat 3.1.

[0022] like Figure 1As shown, the actuator includes a first actuator rod 6a, a second actuator rod 6b and a transmission pin 14. The first actuator rod 6a and the second actuator rod 6b are located on both sides of the lock hook 8. The transmission pin 14 passes through the lock hook 8 through the limit groove 8b in the lock hook 8, and the two ends of the transmission pin 14 are respectively fixedly connected to the first actuator rod 6a and the second actuator rod 6b. The transmission pin 14 is driven by the first actuator rod 6a and the second actuator rod 6b to move in the limit groove 8b, thereby driving the lock hook 8 to perform a locking or unlocking operation.

[0023] Furthermore, the limiting groove 8b in the lock hook 8 is V-shaped, and the limiting groove 8b includes a rear groove 8b-1 and a front groove 8b-2. When the first actuator rod 6a and the second actuator rod 6b move backward to the locking position, the transmission pin 14 moves to the rear groove 8b-1, and during the movement, the lock hook 8 is driven to rotate counterclockwise around the first pin 13 until the transmission pin 14 stops moving. At this time, the lock hook end 8c of the lock hook 8 is higher than the lower surface 3.2a of the front hook 3.2 to lock the front pin of the attachment. When the first actuator rod 6a and the second actuator rod 6b move forward to the unlocking position, the transmission pin 14 moves to the front groove 8b-2, and during the movement, the lock hook 8 is driven to rotate clockwise around the first pin 13 until the transmission pin 14 stops moving. At this time, the lock hook end 8c of the lock hook 8 is lower than the lower surface 3.2a of the front hook 3.2 to unlock the front pin of the attachment.

[0024] The fixing mechanism is arranged at the rear end of the housing 3, and is used to fix the rear end pin of the attachment, and cooperates with the actuator to drive the lock hook 8 to perform locking or unlocking operations.

[0025] Furthermore, the fixing mechanism includes a first locking pin 5a, a second locking pin 5b, a guide block 4, a first guide rod 4.1 and a second guide rod 4.2. The first locking pin 5a and the second locking pin 5b are relatively arranged at the rear end of the shell 3, and are used to extend out of the shell 3 and cooperate with the rear fixing seat 3.3 of the shell 3 to fix the rear end pin of the attachment. The guide block 4 is connected to the middle part of the first locking pin 5a and the second locking pin 5b through the second connecting pin 12a and the third connecting pin 12b. The first guide rod 4.1 and the second guide rod 4.2 are fixedly connected to the side of the guide block 4 close to the front hook 3.2, and are arranged relatively to the first actuator rod 6a and the second actuator rod 6b, and are used to drive the first actuator rod 6a and the second actuator rod 6b to move forward.

[0026] like Figure 4As shown, the hydraulic cylinder 7 is fixed to the housing 3 by bolts 15. The hydraulic cylinder 7 is connected to the fixing mechanism through transmission, and is used to drive the fixing mechanism to move forward and backward along the housing 3. Specifically, the cylinder piston 7.1 of the hydraulic cylinder 7 is connected to the guide block 4 through the first connecting pin 11, and is used to drive the guide block 4 to move forward and backward along the housing 3, thereby driving the first locking pin 5a, the second locking pin 5b, the first guide rod 4.1 and the second guide rod 4.2 to move forward and backward.

[0027] In this embodiment, when the fixing mechanism moves out of the housing 3, the distance between the fixing mechanism and the first actuating rod 6a and the second actuating rod 6b is not less than the distance that the fixing mechanism moves out of the housing 3. Figure 7 and Fig.11 As shown, this is to ensure that even when the first locking pin 5a and the second locking pin 5b are pressed into the housing 3 by the rear end pin of the attachment, the first guide rod 4.1 and the second guide rod 4.2 have not yet contacted or have just contacted the first actuator rod 6a and the second actuator rod 6b, and the unlocking process will not be triggered, ensuring that the front pin locking will not fail due to the failure of the rear end pin of the attachment. Fig.12 The figure shows a front pin shaft locking cross-sectional view when the first guide rod just contacts the first actuator rod.

[0028] In this embodiment, the fixing mechanism drives the first actuating rod 6a and the second actuating rod 6b to move forward to the unlocking position during the forward movement; and the first actuating rod 6a and the second actuating rod 6b move backward to the locking position through the return spring during the backward movement of the fixing mechanism.

[0029] Furthermore, a third return spring 10a and a fourth return spring 10b are respectively sleeved on the first actuating rod 6a and the second actuating rod 6b, so as to drive the first actuating rod 6a and the second actuating rod 6b to move backward to the starting position.

[0030] When the quick connection device 2 is correctly installed with the attachment, the first guide rod 4.1 and the second guide rod 4.2 are separated from the first actuator rod 6a and the second actuator rod 6b, and the counterclockwise rotation of the lock hook 8 to trigger the locking is achieved by the third return spring 10a and the fourth return spring 10b, rather than by the guide block and the actuator rod being rigidly connected together. The advantage of stimulating the locking by the third return spring 10a and the fourth return spring 10b is that when the front end pin of the attachment just hinders the rotation of the lock hook 8, it only causes the lock hook 8 to be stuck, and the third return spring 10a and the fourth return spring 10b are just not reset, which does not affect the normal extension of the hydraulic cylinder 7, and the guide block and the lock pin can move backward normally.

[0031] The first locking pin 5a and the second locking pin 5b are respectively sleeved with a first return spring 9a and a second return spring 9b. One end of the first return spring 9a and the second return spring 9b are connected to the guide block 4, and the other end is connected to the housing 3, so as to drive the first locking pin 5a and the second locking pin 5b to extend out of the housing 3 when the hydraulic cylinder 7 fails.

[0032] like Figure 2 As shown, an indicator 17 is installed on the side of the guide block 4 to indicate the moving position of the guide block. When the cylinder piston 7.1 drives the guide block 4 to move to the front end, the indicator 17 extends out of the housing 3 and can be seen by the driver in the cab. When the cylinder piston 7.1 drives the guide block 4 to move to the rear end, the indicator 17 retracts into the housing 3 and the driver in the cab cannot see the indicator 17.

[0033] When the rear pin of the attachment falls off from the first locking pin 5a and the second locking pin 5b of the quick connection device 2, the quick connection device 2 can ensure that the front pin of the attachment will not fall off. The specific implementation process is as follows: During the process of the hydraulic cylinder 7 extending and the guide block 4, the first locking pin 5a and the second locking pin 5b moving backward at the same time, the first actuator rod 6a and the second actuator rod 6b move backward under the action of the reset spring. The transmission pin 14 moves backward together with the first actuator rod 6a and the second actuator rod 6b. During the backward movement of the transmission pin 14, the lock hook 8 is forced to rotate counterclockwise around the first pin 13, so that the lock hook end 8c of the lock hook 8 is higher than the lower surface 3.2a of the front hook claw of the shell 3. Since the distance between the lock hook end 8c and the upper surface 3.2b of the front hook claw of the shell 3 is smaller than the diameter of the front pin of the attachment, the front pin of the attachment cannot fall off from the front hook claw 3.2 of the shell 3. Figure 8 shown.

[0034] In addition, in order to ensure that the above functions can function normally and will not fail due to the force applied by the front pin of the attachment to the end 8c of the lock hook, the upper limit groove 8b of the lock hook 8 is pressed Figure 8 As shown in the production. Figure 8 As shown, the limit groove 8b of the lock hook 8 and the transmission pin 14 have a contact point in the first quadrant of the transmission pin 14. If the lock hook 8 rotates clockwise, the contact point on the lock hook 8 will move along the rear lower side, as shown in FIG. Figure 8 Arrow of the moving direction of the middle contact point. Since the first actuator rod 6a and the second actuator rod 6b can only move forward and backward along the housing 3, the transmission pin shaft 14 can only move forward and backward with the first actuator rod 6a and the second actuator rod 6b, so in the above state, the transmission pin shaft 14 cannot move backward and downward. Therefore, the device has a self-locking function, no matter how much external force the front pin shaft of the attachment exerts on the end 8c of the lock hook, it will not cause the locking of the front pin shaft to fail.

[0035] Example 2 This embodiment provides an engineering machine based on the first embodiment, including a working device 1 , an attachment and a quick connection device 2 .

[0036] like Figure 5 As shown, the top of the quick connection device 2 is rotatably connected to the working device 1 through the second pin shaft 1.1 and the third pin shaft 1.2. The hydraulic cylinder 7 is connected to the working device 1 through the hydraulic pipeline 7.2. The driver in the cab controls the quick connection device 2 by operating the working device 1.

[0037] The attachment is detachably connected to the quick connection device 2. Specifically, when the attachment is connected to the quick connection device 2, the front pin of the attachment is fixed in the front hook 3.2 and the lock hook 8, and the rear pin of the attachment is fixed between the first locking pin 5a, the second locking pin 5b and the rear fixing seat 3.3 of the housing 3.

[0038] Example 3 When the quick connection device is correctly installed on the working device 1, the driver can install and release the attachment in the cab. The attachment of this embodiment takes the bucket 16 as an example to introduce the loading and unloading process of the bucket 16 and the quick connection device 2.

[0039] (1) Bucket installation process: like Figure 6 As shown, the driver operates the working device 1 so that the front hook 3.2 of the housing 3 hooks the front pin 16.1 of the bucket 16. Then, by operating the working device 1, the quick connection device 2 is rotated so that the rear pin 16.2 of the bucket contacts the rear fixed seat 3.3 of the housing 3. At this time, the front hook 3.2 on the housing 3 contacts the front pin 16.1 of the bucket, and the rear pin 16.2 of the bucket contacts the rear fixed seat 3.3 of the housing 3. By controlling the hydraulic pipeline 7.2, the hydraulic cylinder 7 is extended, and the cylinder piston 7.1 drives the guide block 4 to move backward, thereby driving the first locking pin 5a and the second locking pin 5b to extend from the housing 3, and the first locking pin 5a and the second locking pin 5b are pressed against the rear pin 16.2 of the bucket from below the rear pin 16.2 of the bucket. At this time, the bucket rear pin 16.2 is fixed in the U-shaped space formed by the first locking pin 5a, the second locking pin 5b and the rear fixing seat 3.3 of the housing 3, and the bucket front pin 16.1 is fixed in the front hook 3.2 of the housing 3, and the bucket 16 cannot move relative to the quick connection device 2. Figure 7 shown.

[0040] Bucket release process: By controlling the hydraulic pipeline 7.2, the cylinder piston 7.1 is retracted, and the cylinder piston 7.1 drives the guide block 4, and then drives the first locking pin 5a and the second locking pin 5b to retract into the housing 3. At this time, there is no first locking pin 5a and the second locking pin 5b under the bucket rear pin 16.2. Then, the driver in the cab operates the working device 1 to rotate the quick connection device 2 clockwise to achieve Figure 6 The state shown. When the hydraulic cylinder 7 is retracted to the shortest state, the first guide rod 4.1 and the second guide rod 4.2 press the first actuator rod 6a and the second actuator rod 6b to the front. The first actuator rod 6a and the second actuator rod 6b drive the transmission pin 14 to move forward until the transmission pin 14 contacts the front end groove 8b-2 on the lock hook 8. In the process of the transmission pin 14 moving forward, the transmission pin 14 presses the lock hook 8 to rotate clockwise around the first pin 13, causing the end 8c of the lock hook to be lower than the lower surface 3.2a of the front hook claw of the housing 3, so that the front pin locking state is released, as shown in FIG. Figure 9-10 Then the driver in the cab operates the quick connection device 2 to separate the quick connection device 2 from the bucket 16, that is, the bucket 16 is released.

[0041] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0042] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0043] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A quick connection device, characterized in that: It comprises a housing (3), a hydraulic cylinder (7), a locking hook (8), a fixing mechanism and an actuator mounted on the housing (3); The housing is provided with a front hook (3.2) with one end serving as a front end and the other end serving as a rear end; The locking hook (8) is rotatably connected to the front end of the housing (3) and cooperates with the front hook claw (3.2) to lock or unlock the front end pin of the attachment; The actuator comprises a first actuator rod (6a), a second actuator rod (6b) and a transmission pin shaft (14); the first actuator rod (6a) and the second actuator rod (6b) are located on both sides of the lock hook (8); the transmission pin shaft (14) penetrates the lock hook (8) through a limit groove (8b) in the lock hook (8); and two ends of the transmission pin shaft (14) are respectively fixedly connected to the first actuator rod (6a) and the second actuator rod (6b); the transmission pin shaft (14) is driven by the first actuator rod (6a) and the second actuator rod (6b) to move in the limit groove (8b), thereby driving the lock hook (8) to perform a locking or unlocking operation; The fixing mechanism is arranged at the rear end of the housing (3) and is used to fix the rear end pin of the attachment and cooperate with the actuator to drive the lock hook (8) to perform locking or unlocking operations; The hydraulic cylinder (7) is transmission-connected to the fixing mechanism and is used to drive the fixing mechanism to move forward and backward along the housing (3); when the fixing mechanism moves out of the housing (3), the distance between the fixing mechanism and the first actuating rod (6a) and the second actuating rod (6b) is not less than the distance the fixing mechanism moves out of the housing (3); during the forward movement of the fixing mechanism, the first actuating rod (6a) and the second actuating rod (6b) are driven to move forward to an unlocking position; during the backward movement of the fixing mechanism, the first actuating rod (6a) and the second actuating rod (6b) are moved backward to a locking position by means of a return spring.

2. The quick connection device according to claim 1, characterized in that: The fixing mechanism comprises a first locking pin (5a), a second locking pin (5b), a guide block (4), a first guide rod (4.1) and a second guide rod (4.2); The first locking pin (5a) and the second locking pin (5b) are arranged at the rear end of the shell (3) relative to each other, and are used to extend out of the shell (3) and cooperate with the rear fixing seat (3.3) of the shell (3) to fix the rear end pin of the attachment; The guide block (4) is connected to the middle parts of the first locking pin (5a) and the second locking pin (5b); the first guide rod (4.1) and the second guide rod (4.2) are fixedly connected to one side of the guide block (4) close to the front hook (3.2), and are arranged opposite to the first actuator rod (6a) and the second actuator rod (6b), so as to drive the first actuator rod (6a) and the second actuator rod (6b) to move forward.

3. The quick connection device according to claim 2, characterized in that: The cylinder piston (7.1) of the hydraulic cylinder (7) is connected to the guide block (4) via a first connecting pin (11), and is used to drive the guide block (4) to move forward and backward along the housing (3), thereby driving the first locking pin shaft (5a), the second locking pin shaft (5b), the first guide rod (4.1) and the second guide rod (4.2) to move forward and backward.

4. The quick connection device according to claim 2, characterized in that: A first return spring (9a) and a second return spring (9b) are respectively sleeved on the first locking pin shaft (5a) and the second locking pin shaft (5b); One end of the first return spring (9a) and the second return spring (9b) are connected to the guide block (4), and the other end is connected to the housing (3), and is used to drive the first locking pin shaft (5a) and the second locking pin shaft (5b) to extend out of the housing (3) when the hydraulic cylinder (7) fails.

5. The quick connection device according to claim 3, characterized in that: An indicator (17) is installed on the side of the guide block (4) for indicating the moving position of the guide block; When the oil cylinder piston (7.1) drives the guide block (4) to move to the frontmost end, the indicator (17) extends out of the housing (3); when the oil cylinder piston (7.1) drives the guide block (4) to move to the rearmost end, the indicator (17) retracts into the housing (3).

6. The quick connection device according to claim 1, characterized in that: A third return spring (10a) and a fourth return spring (10b) are respectively sleeved on the first actuating rod (6a) and the second actuating rod (6b), and are used to drive the first actuating rod (6a) and the second actuating rod (6b) to move backwards to a starting position.

7. The quick connection device according to claim 1, characterized in that: The lock hook (8) is provided with a pin shaft hole (8a), the front end of the housing (3) is provided with a lock hook fixing seat (3.1), and the lock hook (8) passes through the pin shaft hole (8a) via a first pin shaft (13) and is rotatably connected to the lock hook fixing seat (3.1).

8. The quick connection device according to claim 7, characterized in that: The limiting groove (8b) in the locking hook (8) is V-shaped, and the limiting groove (8b) comprises a rear groove (8b-1) and a front groove (8b-2); When the first actuating rod (6a) and the second actuating rod (6b) move backward to the locking position, the transmission pin shaft (14) moves to the rear section groove (8b-1), and during the movement, the lock hook (8) is driven to rotate counterclockwise around the first pin shaft (13) until the transmission pin shaft (14) stops moving, at which time the position of the lock hook end (8c) of the lock hook (8) is higher than the lower surface (3.2a) of the front hook claw (3.2) to lock the front pin shaft of the attachment; When the first actuating rod (6a) and the second actuating rod (6b) move forward to the unlocking position, the transmission pin shaft (14) moves to the front slot (8b-2), and during the movement, the lock hook (8) is driven to rotate clockwise around the first pin shaft (13) until the transmission pin shaft (14) stops moving, at which time the position of the lock hook end (8c) of the lock hook (8) is lower than the lower surface (3.2a) of the front hook claw (3.2), thereby unlocking the front pin shaft of the attachment.

9. An engineering machine, characterized in that: It comprises a working device (1), an attachment and a quick connection device (2) as described in any one of claims 1 to 8; The top of the quick connection device (2) is rotatably connected to the working device (1) via a second pin shaft (1.1) and a third pin shaft (1.2); the hydraulic cylinder (7) is transmission-connected to the working device (1) via a hydraulic pipeline (7.2); The attachment is detachably connected to the quick connection device (2).

10. The engineering machine according to claim 9, characterized in that: When the attachment is in a connected state with the quick connection device (2), the front pin of the attachment is fixed in the front hook (3.2) and the lock hook (8), and the rear pin of the attachment is fixed between the first locking pin (5a), the second locking pin (5b) and the rear fixing seat (3.3) of the housing (3).

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