Quick change device and telescopic boom forklift truck with same

Abstract

The utility model provides a quick-change device and a telescopic boom forklift truck with the quick-change device, the quick-change device comprises a mounting seat, the front end of the mounting seat is provided with a hanging shaft and a locking part, the hanging shaft is used for being connected with an accessory, and the locking part comprises guide sleeves connected to the two sides of the mounting seat, a lead screw penetrating through the mounting seat and a driving part; locking structures are arranged at the two ends of the lead screw, and the driving component drives the lead screw to rotate so that the locking structures can move in the guide sleeve in a reciprocating mode. The quick-change device is low in manufacturing cost, light in weight and high in compatibility, hydraulic connectors reserved for accessories cannot be occupied, hydraulic oil ways are reduced, and arrangement of pipelines on the quick-change device and the arm support is facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of telescopic arm forklifts, and in particular relates to a quick-change device and a telescopic arm forklift with the same. Background Art

[0002] Telescopic forklift is a lifting and transportation equipment that integrates fork loading, shoveling, hoisting and manned work platform functions. It is widely used in construction, agriculture, municipal administration, etc. A telescopic forklift often needs to be equipped with a variety of attachments, and the attachments are connected to the telescopic forklift through a quick-change device. Therefore, the structure of the quick-change device directly determines the speed and convenience of the installation and removal of the attachments.

[0003] At present, there are two main types of quick-change devices for telescopic arm forklifts:

[0004] One is a mechanical quick-change device, such as a quick-change device for a forklift disclosed in Chinese utility model patent CN215479498U, which includes a first connecting part and a second connecting part, the first connecting part includes a receiving plate, the receiving plate is provided with an open shaft hole located on the upper side of the receiving plate and a first limit pin hole located on the lower side for installing a limit pin, the second connecting part includes a mounting plate, the mounting plate includes a connecting shaft hole located on the upper side of the mounting plate for installing a connecting shaft and a limit hole located on the rear window on the lower side, the open shaft hole can allow the connecting shaft to be inserted transversely to the axial direction, the open shaft hole can limit the movement of the connecting shaft in the front-to-back direction and downward movement and allow the connecting shaft to move upward, and the limit hole can allow the limit pin to be inserted along the window direction.

[0005] Chinese utility model patent CN218231746U discloses a quick-change device for a multifunctional forklift attachment, which includes a mounting frame and an attachment. The mounting frame is connected to a movable arm frame, and a telescopic oil cylinder is provided on the movable arm frame. The telescopic oil cylinder is connected to the mounting frame, and a fixed pin shaft is provided on the mounting frame. The telescopic oil cylinder is used to drive the mounting frame to rotate around the fixed pin shaft. A positioning pin shaft hole 1 and a positioning pin shaft hole 2 are provided on the mounting frame and the attachment. When the two positioning pin shaft holes 1 are butted, they are connected by the positioning pin shaft 1, and when the two positioning pin shaft holes 2 are butted, they are connected by the positioning pin shaft 2. One of the mounting frame and the attachment is provided with a hook positioning pin, and the other is provided with a hook hole.

[0006] Chinese utility model patent CN220033921U discloses an attachment quick-change device and a telescopic arm forklift, wherein the attachment quick-change device includes a mounting seat and two connecting plates, the mounting seat includes two vertically extending mounting plates and is provided with a first limiting hole, a second limiting hole and a limiting portion, the second limiting hole is located below the first limiting hole, the two connecting plates are installed at intervals on the rear side of the attachment and are parallel to the mounting plates, the connecting plates are provided with a first matching hole, a second matching hole and a stop portion, the first matching hole is connected to the first limiting hole through a first limiting shaft, the second matching hole is connected to the second limiting hole through a second limiting shaft, the first limiting shaft and the second limiting shaft together limit the attachment from flipping forward, and the stop portion and the limiting portion abut against each other to limit the attachment from flipping backward.

[0007] However, when there is only one person in the above three mechanical quick-change devices, the driver needs to get out of the cab after operating them in the cab, manually insert or pull out the locking structure from the pin hole, and complete the disassembly and assembly of the accessories. This method has low working efficiency.

[0008] The other is a hydraulic quick-change device, such as the Chinese utility model patent CN210031947U, which discloses an attachment quick-change device and its application device in a telescopic arm forklift. The attachment quick-change device includes a fixed component, a guide component and a locking component. The fixed component is hinged to the boom, and the guide component is fixedly connected to the fixed component. The locking component locks or unlocks the attachment under the guidance of the guide component; the locking component includes a locking cylinder, a stepped sleeve, a stepped shaft, a locking structure and an inner spring, which are placed on the fixed component through a cylinder mounting seat. The transmission of force in this utility model adopts guided surface-to-surface contact, the locking cylinder piston rod no longer bears torque, and the locking structure can rotate with the attachment, eliminating the force influence of the locking component.

[0009] The Chinese utility model patent CN203781767U discloses a quick-change bracket for forklift attachments. The bracket has a rectangular frame with a pair of lower fixing sleeves on the left and right sides of the lower rear end, and a pair of upper fixing sleeves on the left and right sides of the upper rear end of the frame; a double-acting oil cylinder is transversely installed at the lower part of the frame, and a quick-change latch is installed at the free end of the piston rod at the left and right ends of the double-acting oil cylinder; the left and right sides of the frame are respectively provided with quick-change latch sleeves for receiving the corresponding quick-change latch; at least one hook pin is transversely installed on the top of the frame. The pair of lower fixing sleeves on the left and right sides of the frame are respectively hinged to the corresponding lugs at the front end of the forklift boom. The pair of upper fixing sleeves on the left and right sides of the frame are respectively hinged to the corresponding pull rods on the forklift. Two quick-change latches are respectively hinged to the corresponding lugs on the back of the quick-change attachment. The hook pin receives the hooks on the left and right sides of the upper back of the quick-change attachment.

[0010] The two hydraulic quick-change devices mentioned above can control the insertion or removal of the locking structure through the oil cylinder, and the driver can complete the disassembly and assembly of the accessories in the cab. However, this quick-change device will occupy the reserved hydraulic connector of the accessory. If you want to install accessories with a hydraulic system, you also need to unplug the hydraulic connector connected to the quick-change device and connect the hydraulic connector on the accessory, which is cumbersome to operate. Utility Model Content

[0011] The utility model aims to provide a quick-change device and a telescopic arm forklift with the same, so as to solve the technical problem of poor compatibility of the existing quick-change devices.

[0012] In order to solve the above technical problems, the specific technical solutions of the utility model are as follows:

[0013] A quick-change device includes a mounting seat, the front end of which is provided with a hanging shaft and a locking component for connecting an accessory, the locking component including a guide sleeve connected to both sides of the mounting seat, a screw rod passing through the mounting seat, and a driving component; both ends of the screw rod are provided with a locking structure, and the driving component drives the screw rod to rotate so that the locking structure reciprocates in the guide sleeve.

[0014] Therefore, the quick-change device of the utility model realizes the rapid connection and locking of the attachments through the structures such as the mounting seat, the hanging shaft, the locking component, the guide sleeve, the screw rod and the driving component, thereby improving the operation efficiency of the attachment replacement. Compared with the existing quick-change device, the utility model introduces the screw rod and the driving component. Through this structural feature, the driver can complete the rapid connection and locking of the attachments in the cab under single-person operation, solving the problem that the driver needs to leave the cab for manual operation in mechanical devices, thereby improving the convenience of operation and work efficiency.

[0015] Furthermore, the driving component is a stepping motor.

[0016] Furthermore, a push plate for cooperating with a load-bearing plate on the attachment is provided at the front end of the mounting seat.

[0017] Furthermore, the guide sleeve is connected to the mounting seat through a sleeve, and the screw rod is arranged in the sleeve.

[0018] Furthermore, a window for connecting the interior of the sleeve with the outside is provided on the outer wall of the sleeve, and the window is sealed by a cover plate.

[0019] In addition, the driving component drives the locking structure to extend out of or retract into the end of the sleeve.

[0020] Based on the same design concept, the utility model also provides a telescopic forklift, which includes a boom and accessories installed at the end of the boom, the accessories are installed on the boom through the quick-change device as described above, the top of the mounting seat is connected to the end of the boom, the accessories are provided with a hanging ear and a hook, the hook is connected to the hanging shaft, and the hanging ear is connected to the guide sleeve through the locking structure.

[0021] Furthermore, a push plate is provided at the front end of the mounting seat, and the push plate is used to cooperate with the load-bearing plate of the attachment.

[0022] Furthermore, the guide sleeve is provided with a pin hole, and the locking structure passes through the pin hole to connect the hanging ear with the guide sleeve.

[0023] The utility model of a telescopic arm forklift and assembly and disassembly method has the following advantages:

[0024] 1) By using the telescopic arm forklift of the utility model, the driver can complete the installation and disassembly of the attachments and the quick-change device in the cab, and the operation is simple and fast.

[0025] 2) Compared with the hydraulic quick-change device, the telescopic arm forklift of the utility model has low cost, light weight, does not occupy the hydraulic interface reserved for the attachment, reduces the hydraulic oil circuit, and makes the pipeline layout of the quick-change device and the boom more neat and beautiful.

[0026] 3) The worm gear transmission is adopted, the mechanism can achieve self-locking, there will be no accidental loosening, and the connection is reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic structural diagram of the quick-change device of the utility model from a first perspective;

[0028] Figure 2 This is a schematic structural diagram of the quick-change device of the utility model from a second viewing angle;

[0029] Figure 3 This is an exploded view of the quick-change device of the utility model;

[0030] Figure 4 It is a schematic diagram of the attachment structure of the utility model.

[0031] Explanation of the markings in the figure: 1. Quick-change device; 2. Hanging shaft; 3. Push plate; 4. Guide sleeve; 5. Driving component; 7. Worm gear reducer; 8. Screw; 9. Mounting plate; 10. First flange; 11. Second flange; 12. Connecting rod; 13. Locking structure; 14. Set screw; 15. Cover plate; 16. Accessory; 17. Hanging ear; 18. Load-bearing plate; 19. Hook; 20. Mounting seat; 21. Locking component; 22. Sleeve; 23. Window. DETAILED DESCRIPTION

[0032] In order to better understand the purpose, structure and function of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings.

[0033] like Figures 1 to 3 As shown, a telescopic forklift of this embodiment includes a quick-change device 1 installed at the end of the boom, and an attachment 16 installed on the quick-change device 1, the quick-change device 1 includes a mounting seat 20, the top end of the mounting seat 20 is connected to the end of the boom, the front end of the mounting seat 20 is provided with a hanging shaft 2 for connecting the attachment 16, the front end of the mounting seat 20 is also provided with a push plate 3 and a locking component 21, and the attachment 16 is provided with a bearing plate 18 that matches the push plate 3. The locking component 21 includes a guide sleeve 4 connected to both sides of the mounting seat 20, a screw rod 8 passing through the mounting seat 20, and a driving component 5. Specifically, the guide sleeve 4 is connected to the mounting seat 20 through a sleeve 22, the screw rod 8 is arranged in the sleeve 22, and both ends of the screw rod 8 are provided with a locking structure 13, and the locking structure 13 is preferably a locking pin, and the driving component 5 drives the locking structure 13 to extend or retract into the end of the sleeve 22. Specifically, a window 23 for connecting the inside of the sleeve 22 with the outside is provided on the outer wall of the sleeve 22, and the window 23 is sealed by a cover plate 15. The driving component 5 drives the screw 8 to rotate so that the locking structure 13 reciprocates in the guide sleeve 4. Preferably, the driving component 5 is a stepper motor. The quick-change device of this embodiment is controlled by an electronic control system, and a stepper motor is used to control the insertion or extraction of the locking structure.

[0034] like Figure 1 and Figure 4 As shown, the attachment 16 is provided with a hanging ear 17 and a hook 19, the hook 19 is connected to the hanging shaft 2, and the hanging ear 17 is connected to the guide sleeve 4 through the locking structure 13. Specifically, the guide sleeve 4 and the hanging ear 17 are both provided with pin holes, and the locking structure 13 passes through the pin holes to connect the hanging ear 17 to the guide sleeve 4.

[0035] As a preferred embodiment of the utility model, the upper part of the quick-change device 1 is a hanging shaft 2, the front side of the lower part is a push plate 3, and the rear side of the lower part is installed with a stepper motor assembly. The stepper motor assembly is a detachable structure, which is easy to install, and is composed of a stepper motor, a worm gear reducer 7 and a screw 8. The use of the worm gear reducer 7 realizes the self-locking of the mechanism. One end of the screw 8 is a left-handed thread, and the other end is a right-handed thread. The two ends of the screw are respectively screwed into the first flange 10 and the second flange 11, and the internal threads of the first flange 10 and the second flange 11 are opposite in direction. The first flange 10 and the second flange 11 are connected to one end of the flange surface of the connecting rod 12 by bolts, and the other end of the connecting rod 12 is connected to the locking structure 13 by a set screw 14. Guide sleeves 4 are installed at both ends of the rear side of the quick-change device 1. The connecting rod and the limit pin are loosely connected to ensure that under special circumstances, after the limit pin is subjected to external force, the external force will not be transmitted to the connecting rod.

[0036] The stepper motor assembly is mounted on the mounting plate 9 by bolts, and the mounting plate 9 is then mounted on the quick-change device 1 by bolts. The cover plate 15 is mounted on the quick-change device 1 by bolts to prevent foreign matter from entering the sleeve 22 in the quick-change device 1 through the window 23.

[0037] There is a pin hole on the guide sleeve 4, and the locking structure 13 can slide in the pin hole. Two stepper motors can be used to control the left and right limit pins to be inserted or pulled out of the pin holes. After the quick-change device 1 is assembled with the attachment, the force-bearing position of the quick-change device 1 is the hanging shaft 2 and the push plate 3. Under normal working conditions, the locking structure 13 will not bear force. If it is subjected to force, the bending moment generated will only be transmitted to the guide sleeve 4 and the rectangular tube of the quick-change device 1, and will not be transmitted to the connecting rod 12, because the connecting rod 12 and the locking structure 13 are loosely connected.

[0038] A flange is welded at one end of the connecting rod 12, which is used to connect with the first flange 10 or the second flange 11. A rectangular plate is welded in the middle. The outer dimensions of the rectangular plate are slightly smaller than the inner dimensions of the rectangular tube in the quick-change device 1. Therefore, the connecting rod 12 can slide in the rectangular tube. After being connected with the first flange 10 or the second flange 11, the first flange 10 and the second flange 11 can only move along the axis of the screw rod, but cannot rotate on the screw rod. Therefore, when the stepper motor rotates, the screw rod 8 is driven to rotate through the worm gear reducer 7, and the first flange 10 and the second flange 11 will move relative to or towards each other along the axis of the screw rod. At this time, the locking structure 13 connected to the connecting rod 12 will move in the pin shaft hole of the guide sleeve 4. Therefore, it is only necessary to control the forward and reverse rotation of the stepper motor to achieve the insertion or removal of the locking structure 13. As another preferred embodiment of the utility model, the threaded screw transmission can be changed to a ball screw transmission or other mechanism that can convert rotational motion into linear motion.

[0039] like Figure 4As shown, it is a schematic diagram of the structure of an attachment bucket suitable for the quick-change device described in this embodiment. Two vertical plates with hooks 19 are welded to the rear side of the bucket. A bent load-bearing plate 18 is welded in the middle of the two vertical plates. Two hanging ears 17 with pin shaft holes are welded on the outside of the two vertical plates.

[0040] The steps for assembling and disassembling the attachment and the quick-change device in this embodiment are as follows:

[0041] During assembly: the driver first operates the telescopic forklift to hook the hanging shaft 2 by the hook 19, and then operates the quick-change device 1 to flip upward until the push plate 3 supports the load-bearing plate 18. At this time, the pin hole on the guide sleeve 4 is aligned with the pin hole on the attachment. Finally, the stepper motor is controlled to rotate, and the locking structure 13 extends and passes through the pin hole on the attachment to complete the locking.

[0042] During disassembly: the driver first controls the motor to rotate in the opposite direction, the locking structure 13 withdraws from the pin shaft hole, the lock is canceled, and then the attachment is lowered to the ground, laid flat, and then the quick-change device 1 is operated to flip downward, the push plate 3 is away from the load-bearing plate 18, and finally the boom is operated to change the amplitude downward, the hanging shaft 2 is disengaged from the connection with the hook 19, and the disassembly is completed.

[0043] It is understood that the present invention is described by some embodiments, and those skilled in the art are aware that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A quick change device, characterized in that: The invention comprises a mounting seat (20), wherein the front end of the mounting seat (20) is provided with a hanging shaft (2) for connecting an attachment (16) and a locking component (21), wherein the locking component (21) comprises a guide sleeve (4) connected to both sides of the mounting seat (20), a screw rod (8) passing through the mounting seat (20), and a driving component (5); both ends of the screw rod (8) are provided with a locking structure (13), and the driving component (5) drives the screw rod (8) to rotate so that the locking structure (13) reciprocates in the guide sleeve (4).

2. The quick-change device according to claim 1, characterized in that: The driving component (5) is a stepping motor.

3. The quick-change device according to claim 1, characterized in that: The front end of the mounting seat (20) is provided with a push plate (3) for cooperating with a load-bearing plate (18) on the attachment (16).

4. The quick-change device according to claim 1, characterized in that: The guide sleeve (4) is connected to the mounting seat (20) via a sleeve (22), and the screw rod (8) is arranged in the sleeve (22).

5. The quick-change device according to claim 4, characterized in that: A window (23) for connecting the interior of the sleeve (22) with the outside is provided on the outer wall of the sleeve (22), and the window (23) is sealed by a cover plate (15).

6. The quick-change device according to claim 4, characterized in that: The driving component (5) drives the locking structure (13) to extend out of or retract into the end of the sleeve (22).

7. A telescopic forklift, comprising a boom and an attachment (16) mounted at the end of the boom, characterized in that: The accessory (16) is installed on the arm through the quick-change device described in any one of claims 1 to 6, the top end of the mounting seat (20) is connected to the end of the arm, and the accessory (16) is provided with a hanging ear (17) and a hook (19), the hook (19) is connected to the hanging shaft (2), and the hanging ear (17) is connected to the guide sleeve (4) through the locking structure (13).

8. The telescopic forklift according to claim 7, characterized in that: A push plate (3) is provided at the front end of the mounting seat (20), and the push plate (3) is used to cooperate with the load-bearing plate (18) of the attachment (16).

9. The telescopic forklift according to claim 7, characterized in that: The guide sleeve (4) is provided with a pin hole, and the locking structure (13) passes through the pin hole to connect the hanging ear (17) with the guide sleeve (4).

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