Quick connection device and engineering machinery

Abstract

The present invention discloses a quick connection device and engineering machinery, belonging to the technical field of engineering machinery. The quick connection device includes a housing, a hydraulic cylinder, a lock hook, a fixing mechanism and an actuator; the housing is provided with one end of a front hook claw as a front end and the other end as a rear end; the lock hook is rotatably connected to the front end of the housing, and cooperates with the front hook claw to lock or unlock the front end pin shaft of the attachment; the actuator includes a first actuator rod, a second actuator rod and a transmission pin shaft; the fixing mechanism is provided at the rear end of the housing, and is used to fix the rear end pin shaft of the attachment, and cooperates with the actuator to drive the lock hook to perform locking or unlocking operations; the hydraulic cylinder is connected to the fixing mechanism, and is used to drive the fixing mechanism to move forward and backward along the housing. The present invention can automatically lock the front pin shaft of the attachment without manual intervention and without the need for an additional driver, effectively preventing the attachment from falling off, and can prevent personal injury or damage to objects caused by the attachment falling, thereby greatly improving work safety.

Description

Technical Field

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

[0002] A quick-connect device is typically located at the end of an earth-moving machine's working device, allowing for quick replacement of various attachments. The quick-connect device has a mounting seat on one side for engaging a first pin of the attachment, and at least one engaging element on the other side capable of securing a second pin of the attachment. The engaging element is movable between a release position and an engaged 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 device may be released, endangering people in the work area. To prevent the attachment device from falling and endangering personal safety, additional safety devices such as safety hooks and locking pin claws are generally used on quick connectors. However, this increases the weight of the device and reduces work efficiency. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and 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:

[0006] In the first aspect, a quick connection device is provided, including 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 the front end and the other end as the 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 includes a first actuator rod, a second actuator rod and a transmission pin shaft, the first actuator rod and the second actuator rod are located on both sides of the lock hook, the transmission pin shaft passes through the lock hook through the limiting groove in the lock hook, and the two ends of the transmission pin shaft are fixedly connected to the first actuator rod and the second actuator rod respectively; the transmission pin shaft 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 unlocked position; during the backward movement of the fixing mechanism, the first actuator rod and the second actuator rod move backward to the locked position through the return spring.

[0007] 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 opposite 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.

[0008] 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, and then drive the first locking pin shaft, the second locking pin shaft, the first guide rod and the second guide rod to move forward and backward.

[0009] 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.

[0010] 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.

[0011] As an optional technical solution of the present invention, a third return spring and a fourth return spring are respectively mounted 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.

[0012] As an optional technical solution of the present invention, a pin hole is provided on the lock hook, and a lock hook fixing seat is provided at the front end of the shell. The lock hook passes through the pin hole through the first pin and is rotatably connected to the lock hook fixing seat.

[0013] 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 groove and a front 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 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. 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 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 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. 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 to unlock the front end pin shaft of the accessory.

[0014] In the second aspect, an engineering machinery is provided, 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 through a second pin shaft and a third pin shaft; the hydraulic cylinder is connected to the working device through a hydraulic pipeline transmission; the accessories are detachably connected to the quick connecting device.

[0015] As an optional technical solution of the present invention, when the attachment is connected to the quick connection device, the front end pin of the attachment is fixed in the front hook and the lock hook, and the rear end pin of the attachment is fixed between the first locking pin, the second locking pin and the rear fixing seat of the shell.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 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 attachment applies to 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 attachment can be automatically locked without manual intervention and the need for an additional driver, effectively preventing the attachment from falling off, and preventing personal injury or damage to objects caused by the falling attachment, thereby greatly improving work safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a bottom perspective view of a quick connect device according to an embodiment of the present invention;

[0019] Figure 2 is a front end cross-sectional view of a quick connection device according to an embodiment of the present invention;

[0020] Figure 3 is a side sectional view of a quick connection device according to an embodiment of the present invention;

[0021] Figure 4 is a top view of a quick connection device according to an embodiment of the present invention;

[0022] Figure 5 2 is a schematic diagram of the connection between the quick connection device and the working device in an embodiment of the present invention;

[0023] Figure 6 is a schematic diagram of an engineering machine according to an embodiment of the present invention;

[0024] Figure 7 is a cross-sectional view of a bucket mounted on a quick-connect device according to an embodiment of the present invention;

[0025] Figure 8 is a cross-sectional view of the front pin locking of the bucket installed with the quick connection device according to an embodiment of the present invention;

[0026] Figure 9 is a cross-sectional view of a quick-connect device releasing a bucket according to an embodiment of the present invention;

[0027] Figure 10 is a cross-sectional view of the front pin of the quick-connect device releasing the bucket in an embodiment of the present invention;

[0028] Figure 11 is a cross-sectional view of the first guide rod just contacting the first actuator rod in an embodiment of the present invention;

[0029] Figure 12 This is a cross-sectional view of the front pin locking when the first guide rod just contacts the first actuator rod in an embodiment of the present invention.

[0030] The following are labeled in the figure: 1. Working device; 1.1. Second pin; 1.2. Third pin; 2. Quick-connect device; 3. Housing; 3.1. Lock hook mounting base; 3.2. Front hook; 3.2a. Lower surface of front hook; 3.2b. Upper surface of front hook; 3.3. Rear mounting base; 4. Guide block; 4.1. First guide rod; 4.2. Second guide rod; 5a. First locking pin; 5b. Second locking pin; 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. Drive pin shaft; 15. Bolt; 16. Bucket; 16.1. Front bucket pin shaft; 16.2. Rear bucket pin shaft; 17. Indicator. DETAILED DESCRIPTION

[0031] 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 solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0032] Example 1

[0033] 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.

[0034] 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.

[0035] 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 is rotatably connected to the lock hook fixing seat 3.1 via a first pin 13 that passes through the pin hole 8a.

[0036] like Figure 1As shown, the actuator mechanism includes a first actuator rod 6a, a second actuator rod 6b, and a transmission pin 14. The first and second actuator rods 6a and 6b are located on either side of the lock hook 8. The transmission pin 14 extends through the lock hook 8 through a retaining slot 8b therein, and its ends are fixedly connected to the first and second actuator rods 6a and 6b, respectively. The first and second actuator rods 6a and 6b drive the transmission pin 14 to move within the retaining slot 8b, thereby driving the lock hook 8 to lock or unlock.

[0037] Furthermore, the limiting groove 8b in the locking hook 8 is V-shaped and includes a rear groove 8b-1 and a front groove 8b-2. When the first and second actuator rods 6a and 6b move rearward to the locked position, the transmission pin 14 moves to the rear groove 8b-1, driving the locking hook 8 to rotate counterclockwise around the first pin 13 until the transmission pin 14 stops moving. At this point, the locking hook end 8c of the locking hook 8 is positioned above the lower surface 3.2a of the front hook 3.2, thereby locking the front pin of the attachment. When the first and second actuator rods 6a and 6b move forward to the unlocked position, the transmission pin 14 moves to the front groove 8b-2, driving the locking hook 8 to rotate clockwise around the first pin 13 until the transmission pin 14 stops moving. At this point, the locking hook end 8c of the locking hook 8 is positioned below the lower surface 3.2a of the front hook 3.2, thereby unlocking the front pin of the attachment.

[0038] 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.

[0039] 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 accessory. 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 relative 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.

[0040] like Figure 4As shown, the hydraulic cylinder 7 is fixed to the housing 3 via bolts 15. The hydraulic cylinder 7 is connected to a fixing mechanism, driving the fixing mechanism to move back and forth along the housing 3. Specifically, the cylinder piston 7.1 of the hydraulic cylinder 7 is connected to the guide block 4 via a first connecting pin 11, driving the guide block 4 to move back and forth 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 back and forth.

[0041] In this embodiment, when the fixing mechanism moves out of the housing 3, the distance between the fixing mechanism and the first actuator rod 6a and the second actuator rod 6b is not less than the distance the fixing mechanism moves out of the housing 3. Figure 7 and Figure 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 failure of the rear end pin of the attachment will not cause the front pin locking to fail. Figure 12 The figure shows a cross-sectional view of the front pin shaft locking when the first guide rod just contacts the first actuator rod.

[0042] In this embodiment, the fixing mechanism drives the first and second actuator rods 6a and 6b to move forward to the unlocked position during the forward movement; and the fixing mechanism moves backward, and the first and second actuator rods 6a and 6b move backward to the locked position by the return spring.

[0043] 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.

[0044] When the quick-connect device 2 is properly installed with the attachment, the first and second guide rods 4.1, 4.2 are separated from the first and second actuator rods 6a, 6b. Counterclockwise rotation of the locking hook 8 to activate the lock is achieved by the third and fourth return springs 10a, 10b, rather than by the guide block being rigidly connected to the actuator rod. The advantage of activating the lock by the third and fourth return springs 10a, 10b is that if the front pin of the attachment blocks the rotation of the locking hook 8, only the locking hook 8 becomes stuck. The third and fourth return springs 10a, 10b simply remain in place, leaving the hydraulic cylinder 7 unaffected and allowing the guide block and locking pin to move backward normally.

[0045] A first return spring 9a and a second return spring 9b are respectively mounted on the first locking pin 5a and the second locking pin 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. These springs are used 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.

[0046] like Figure 2 As shown, an indicator 17 is mounted on the side of the guide block 4 to indicate its position. When the cylinder piston 7.1 drives the guide block 4 to the front end, the indicator 17 extends from the housing 3 and can be seen by the driver inside the cab. When the cylinder piston 7.1 drives the guide block 4 to the rear end, the indicator 17 retracts into the housing 3 and is no longer visible to the driver inside the cab.

[0047] 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:

[0048] 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. In the process of moving backward, the transmission pin 14 forces the lock hook 8 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 shaft of the attachment, the front pin shaft of the attachment cannot fall off from the front hook claw 3.2 of the shell 3, as shown in FIG. Figure 8 shown.

[0049] In addition, in order to ensure that the above functions can function normally and will not fail due to the force exerted by the front pin of the attachment on 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 limiting 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 indicating the direction of movement of the center contact point. Because the first and second actuator rods 6a, 6b can only move forward and backward along the housing 3, the drive pin 14 can also only move forward and backward with them. Therefore, in this state, the drive pin 14 cannot move backward and downward. Therefore, the device has a self-locking function, and no matter how much external force the attachment's front pin exerts on the hook end 8c, the front pin's locking will not fail.

[0050] Example 2

[0051] This embodiment provides an engineering machine based on the first embodiment, including a working device 1 , an attachment, and a quick connection device 2 .

[0052] like Figure 5 As shown, the top of the quick-connect device 2 is rotatably connected to the working device 1 via a second pin 1.1 and a third pin 1.2. The hydraulic cylinder 7 is connected to the working device 1 via a hydraulic line 7.2. The driver in the cab controls the quick-connect device 2 by manipulating the working device 1.

[0053] The attachment is detachably connected to the quick-connect device 2. Specifically, when the attachment is connected to the quick-connect device 2, the front pin of the attachment is fixed within 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.

[0054] Example 3

[0055] When the quick-connect 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 installation and removal process of the bucket 16 and the quick-connect device 2.

[0056] (1) Bucket installation process:

[0057] like Figure 6 As shown, the operator 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. The operator then operates the working device 1 and rotates the quick-connect device 2 so that the rear bucket pin 16.2 contacts the rear mounting seat 3.3 of the housing 3. At this point, the front hook 3.2 on the housing 3 contacts the front bucket pin 16.1, and the rear bucket pin 16.2 contacts the rear mounting seat 3.3 of the housing 3. By controlling the hydraulic line 7.2, the hydraulic cylinder 7 extends, and the cylinder piston 7.1 drives the guide block 4 backward, thereby driving the first locking pin 5a and the second locking pin 5b to extend from the housing 3. The first locking pin 5a and the second locking pin 5b abut against the rear bucket pin 16.2 from below. 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. The bucket 16 cannot move relative to the quick connection device 2. Figure 7 shown.

[0058] Bucket release process:

[0059] By controlling the hydraulic line 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 below the bucket rear pin 16.2. Then, the driver in the cab operates the working device 1 and rotates 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.

[0060] 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 orientations or positional relationships based on the orientations 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", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. 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.

[0061] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0062] 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) passes through the lock hook (8) through a limiting groove (8b) in the lock hook (8); and the 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 limiting groove (8b), thereby driving the lock hook (8) to perform a locking or unlocking operation; The fixing mechanism is provided 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 connected to the fixing mechanism in a transmission manner 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 actuator rod (6a) and the second actuator 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 actuator rod (6a) and the second actuator rod (6b) are driven to move forward to an unlocked position; during the backward movement of the fixing mechanism, the first actuator rod (6a) and the second actuator rod (6b) are moved backward to a locked position by 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 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 of the first locking pin (5a) and the second locking pin (5b), and 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 opposite to the first executing rod (6a) and the second executing rod (6b), and are used to drive the first executing rod (6a) and the second executing 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 front 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 rear 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 backward 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), 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 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) includes 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 slot (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 this 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), thereby locking the front end 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 (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 (13) until the transmission pin (14) stops moving. At this 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 (3.2), thereby unlocking the front pin of the attachment.

9. An engineering machine, characterized in that: Comprising 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 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).

Images