Quick distance adjusting device for pallet forks of cross-country forklift

Abstract

The utility model relates to the technical field of forklifts, in particular to a quick distance adjusting device for forks of a cross-country forklift, which can be used for synchronously adjusting the distance between two forks and independently adjusting the position of a single fork, and is good in flexibility. Comprising a pallet fork frame, a sliding rail, a left pallet fork and a right pallet fork, the sliding rail is installed on the front end face of the pallet fork frame, and the left pallet fork and the right pallet fork are slidably installed on the sliding rail; the pallet fork further comprises two chain wheel shafts, two chain wheels, a chain and chain clamping assemblies, the two chain wheel shafts are rotationally installed on the left side and the right side of the front end face of the pallet fork frame, the two chain wheels are concentrically installed on the two chain wheel shafts respectively, the chain is connected to the two chain wheels in a sleeving mode, and the chain clamping assemblies are installed on the left pallet fork and the right pallet fork and used for clamping or loosening the chain.

Description

Technical Field

[0001] This utility model relates to the technical field of forklifts, and in particular to a quick-adjustment device for the forks of an off-road forklift. Background Technology

[0002] When transporting goods, off-road forklifts need to adjust the fork spacing according to the size of the goods. Various fork spacing adjustment devices are disclosed in the prior art. For example, Chinese utility model patent CN218058341U discloses a fork spacing adjustment mechanism for forklifts. This mechanism has a horizontally arranged long shaft mounted at the front end of the fork carriage assembly. Two forks are movably sleeved on the long shaft. A chain drive mechanism is installed between the two forks and the fork carriage assembly, causing the two forks to move in opposite directions when either fork is pushed by an external force. An adjusting cylinder for pushing either fork is mounted on the fork carriage assembly. When the adjusting cylinder controls the movement of one fork under the drive of hydraulic oil, it simultaneously drives the other fork to move synchronously in the opposite direction via the chain. This achieves the purpose of one adjusting cylinder controlling two forks simultaneously, enabling synchronous fork spacing adjustment. Furthermore, by reducing one hydraulic circuit and control valve, the manufacturing cost of the forklift's adjusting fork is reduced.

[0003] The aforementioned fork offset device uses a drive mechanism consisting of a hydraulic cylinder, sprocket, and chain to drive the two forks to move synchronously relative to each other. However, the aforementioned fork offset device cannot independently adjust the position of a single fork, thus its flexibility is poor. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a fast fork spacing adjustment device for off-road forks that can simultaneously adjust the spacing of two forks and independently adjust the position of a single fork, offering high flexibility.

[0005] This utility model discloses a quick forklift fork adjustment device, including a fork carriage, a slide rail, a left fork, and a right fork. The slide rail is mounted on the front end face of the fork carriage, and the left and right forks are slidably mounted on the slide rail. It also includes two sprocket shafts, two sprockets, a chain, and a chain locking assembly. The two sprocket shafts are rotatably mounted on the left and right sides of the front end face of the fork carriage. The two sprockets are concentrically mounted on the two sprocket shafts, and the chain is mounted on the two sprockets. A chain locking assembly is installed on both the left and right forks to engage or disengage the chain. When the position of the left fork needs to be adjusted, the chain locking assembly of the left fork is engaged with the chain, and the chain locking assembly of the right fork is disengaged from the chain. Rotating the sprockets drives the chain to rotate, causing the chain to move the left fork along the slide rail via the locking assembly, thereby adjusting the position of the left fork. The position of the forks is adjusted as follows: When the position of the right fork needs to be adjusted, disengage the chain clamping assembly of the left fork from the chain, and engage the chain clamping assembly of the right fork with the chain. Rotating the sprocket drives the chain to rotate, causing the chain to move the right fork along the slide rail via the clamping assembly, thereby adjusting the position of the right fork and consequently adjusting the distance between the left and right forks. When the distance between the left and right forks needs to be adjusted simultaneously, engage the upper layer of the chain via the clamping assembly of the left fork and the lower layer of the chain via the clamping assembly of the right fork. Rotating the sprocket causes the upper and lower layers of the chain to move the left and right forks closer or further apart along the slide rail via the clamping assemblies. Compared to existing technologies, this method allows for simultaneous adjustment of the distance between the two forks and independent adjustment of the position of a single fork, offering greater flexibility.

[0006] Preferably, it also includes a worm gear, a shaft, and a worm. The worm gear is concentrically mounted on the sprocket shaft, the shaft is rotatably mounted on the fork carriage, and the worm is concentrically mounted on the shaft, with the worm meshing with the worm gear. The shaft is driven to rotate by a drive mechanism, which in turn drives the worm to rotate. The worm meshes with the worm gear and drives the sprocket shaft and sprocket to rotate, thus enabling the sprocket to drive the chain to rotate. The worm gear and worm have a self-locking function to prevent chain movement and improve stability.

[0007] Preferably, it also includes a drive component, which is a handwheel mounted on the shaft; the handwheel facilitates manual drive of the shaft and worm gear, making operation simple.

[0008] Preferably, the chain assembly includes a slider, a pin, a rack, a gear, and a handle. The slider is slidably mounted on the rear side wall of the left fork. The pin is mounted on the end of the slider. A rack is mounted on the side wall of the slider. The gear is rotatably mounted on the left fork and meshes with the rack. One end of the handle is connected to the gear. Turning the handle drives the gear to rotate, and the gear meshes with the rack to drive the slider to move up and down, thereby driving the pin to insert into the socket between the rollers of the chain, so that the left fork is engaged with the chain. Alternatively, the pin can be pulled out of the socket to disengage the left fork from the chain. The operation is simple and the practicality is good.

[0009] Preferably, the chain assembly includes a second slider, a second pin, a slide groove, and a push rod. The second slider is slidably mounted on the rear side wall of the left fork. The second pin is mounted on the end of the second slider. The slide groove is mounted on the left fork. The push rod is slidably mounted in the slide groove. An inclined slide path is provided in the middle of the second slider. The middle of the push rod is inclined and slidably inserted into the inclined slide path of the second slider. Pushing the push rod to move left and right in the slide groove causes the middle of the push rod to press against the inclined slide path of the second slider, thereby driving the second slider to move up and down on the left fork. This causes the second slider to drive the second pin to insert into the insertion hole between the rollers of the chain, thus engaging the left fork with the chain. Alternatively, the second pin can be pulled out of the insertion hole, disengaging the left fork from the chain. The operation is simple and practical.

[0010] Preferably, it also includes two wheel carriers and two tension wheels. The two wheel carriers are respectively mounted on the left fork and the right fork, and the two tension wheels are rotatably mounted on the two wheel carriers. The two tension wheels are connected and engaged with the chain. The two tension wheels are connected and engaged with the upper or lower layer of the chain, so that the two tension wheels lift and tension the chain, keeping the chain taut.

[0011] Compared with the prior art, the advantages of this utility model are: it can synchronously adjust the distance between two forks, and can also independently adjust the position of a single fork, which is highly flexible. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 This is a schematic diagram of the rear-view axonometric structure of this utility model;

[0014] Figure 3 It is a structural diagram of the left fork, right fork, sprocket shaft, sprocket, chain, worm gear, shaft and worm, etc.

[0015] Figure 4 It is a structural diagram of components such as sprocket shaft, sprocket, chain, worm gear, shaft and worm;

[0016] Figure 5 This is a structural diagram of the left fork and chain assembly, etc.

[0017] Figure 6 This is a structural diagram of the right fork and chain assembly, etc.

[0018] The following are labels in the attached diagram: 1. Fork carriage; 2. Slide rail; 3. Left fork; 4. Right fork; 5. Sprocket shaft; 6. Sprocket; 7. Chain; 8. Worm gear; 9. Shaft; 10. Worm; 11. Handwheel; 12. Slider 1; 13. Pin 1; 14. Rack; 15. Gear; 16. Handle; 17. Slider 2; 18. Pin 2; 19. Slide groove; 20. Push rod; 21. Wheel carrier; 22. Tensioner wheel. Detailed Implementation

[0019] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. This utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of this utility model more thorough and complete. Example 1

[0020] like Figures 1 to 5 As shown, a rapid fork spacing adjustment device for an off-road forklift includes a fork carriage 1, a slide rail 2, a left fork 3, and a right fork 4. The slide rail 2 is mounted on the front end face of the fork carriage 1, and the left fork 3 and right fork 4 are slidably mounted on the slide rail 2. It also includes two sprocket shafts 5, two sprockets 6, a chain 7, and a chain locking assembly. The two sprocket shafts 5 are rotatably mounted on the left and right sides of the front end face of the fork carriage 1. The two sprockets 6 are concentrically mounted on the two sprocket shafts 5, and the chain 7 is connected and fitted onto the two sprockets 6. A chain locking assembly is mounted on both the left fork 3 and the right fork 4, and the chain locking assembly is used to lock or release the chain 7. It also includes a worm gear 8, a shaft 9, and a worm 10. The worm gear 8 is concentrically mounted on the sprocket shaft 5, the shaft 9 is rotatably mounted on the fork carriage 1, and the worm 10 is concentrically mounted on the shaft 9. 10 meshes with worm gear 8; it also includes a drive component, which is a handwheel 11, which is mounted on shaft 9; the chain assembly includes a slider 12, a pin 13, a rack 14, a gear 15, and a handle 16. The slider 12 is slidably mounted on the rear side wall of the left fork 3. The pin 13 is mounted on the end of the slider 12. The rack 14 is mounted on the side wall of the slider 12. The gear 15 is rotatably mounted on the left fork 3 and meshes with the rack 14. One end of the handle 16 is connected to the gear 15; it also includes two wheel frames 21 and two tension wheels 22. The two wheel frames 21 are respectively mounted on the left fork 3 and the right fork 4. The two tension wheels 22 are respectively rotatably mounted on the two wheel frames 21 and are connected and meshed with the chain 7.

[0021] Two tensioning pulleys 22 engage with the upper or lower layer of the chain 7, lifting and tensioning the chain 7 to maintain tension. Turning the handle 16 rotates the gear 15, which meshes with the rack 14, driving the slider 12 to rise and fall. This, in turn, drives the pin 13 to insert into the socket between the rollers of the chain 7, engaging the left fork 3 with the chain 7. Alternatively, the pin 13 can be pulled out of the socket, disengaging the left fork 3 from the chain 7. When the position of the left fork 3 needs to be adjusted, engage pin 13 of the left fork 3 with chain 7, disengage pin 13 of the right fork 4 from chain 7, and manually drive shaft 9 and worm gear 10 to rotate via handwheel 11. Worm gear 10 engages worm wheel 8 to drive sprocket shaft 5 and sprocket 6 to rotate, causing sprocket 6 to drive chain 7 to rotate. Worm wheel 8 and worm gear 10 have a self-locking function to prevent chain 7 from moving. Sprocket 6 drives chain 7 to rotate, causing chain 7 to pass through the engagement assembly. The mechanism moves the left fork 3 along the slide rail 2, thereby adjusting its position. When the position of the right fork 4 needs adjustment, the chain locking assembly of the left fork 3 is disengaged from the chain 7, and the chain locking assembly of the right fork 4 is engaged with the chain 7. Rotating the sprocket 6 drives the chain 7 to rotate, causing the chain 7 to move the right fork 4 along the slide rail 2 via the locking assembly, thus adjusting the position of the right fork 4 and consequently the distance between the left fork 3 and the right fork 4. When the distance between the left fork 3 and the right fork 4 needs to be adjusted simultaneously, the left fork 3 is engaged with the upper layer of the chain 7 via the locking assembly, and the right fork 4 is engaged with the lower layer of the chain 7 via the locking assembly. Rotating the sprocket 6 causes the upper and lower layers of the chain 7 to move the left fork 3 and the right fork 4 closer or further apart along the slide rail 2 via the locking assemblies, respectively. Compared with existing technologies, this mechanism can simultaneously adjust the distance between the two forks and also independently adjust the position of a single fork, offering greater flexibility. Example 2

[0022] like Figure 1 , Figure 3 and Figure 6 As shown, based on Embodiment 1, the chain assembly includes a second slider 17, a second pin 18, a slide groove 19, and a push rod 20. The second slider 17 is slidably mounted on the rear side wall of the left fork 3. The second pin 18 is mounted on the end of the second slider 17. The slide groove 19 is mounted on the left fork 3. The push rod 20 is slidably mounted in the slide groove 19. An inclined slide is provided in the middle of the second slider 17. The middle of the push rod 20 is inclined and slidably inserted into the inclined slide of the second slider 17.

[0023] Pushing the push rod 20 to move left and right in the slide groove 19 causes the middle part of the push rod 20 to press against the inclined slide of the slider 2 17, thereby driving the slider 2 17 to rise and fall on the left fork 3. The slider 2 17 drives the pin 2 18 to insert into the insertion hole between the rollers of the chain 7, so that the left fork 3 is locked and connected to the chain 7. Alternatively, the pin 2 18 can be pulled out of the insertion hole to disengage the left fork 3 from the chain 7. The operation is simple.

[0024] like Figures 1 to 6 As shown, this utility model discloses a quick forklift fork adjustment device. When adjusting the position of the left fork 3, the chain clamping assembly of the left fork 3 is engaged with the chain 7, while the chain clamping assembly of the right fork 4 is disengaged from the chain 7. The drive shaft 9 rotates, driving the worm gear 10 to rotate. The worm gear 10 engages with the worm wheel 8, driving the sprocket shaft 5 and sprocket 6 to rotate. The sprocket 6 then drives the chain 7 to rotate, causing the chain 7 to move the left fork 3 along the slide rail 2 via the clamping assembly, thus adjusting the position of the left fork 3. Next, when adjusting the position of the right fork 4, the chain clamping assembly of the left fork 3 is disengaged from the chain 7, while the chain clamping assembly of the right fork 4 is engaged with the chain 7. The sprocket 6 is rotated, and the chain... The drive chain 7 rotates, causing the chain 7 to move the right fork 4 along the slide rail 2 via the clamping assembly, thereby adjusting the position of the right fork 4 and adjusting the distance between the left fork 3 and the right fork 4. When it is necessary to adjust the distance between the left fork 3 and the right fork 4 simultaneously, the left fork 3 is connected to the upper clamping assembly of the chain 7 via the clamping assembly, and the right fork 4 is connected to the lower clamping assembly of the chain 7 via the clamping assembly. The sprocket 6 is rotated, causing the upper and lower layers of the chain 7 to move the left fork 3 and the right fork 4 closer or further apart along the slide rail 2 via the clamping assembly. Finally, as the left fork 3 and the right fork 4 move, they drive the two tensioning wheels 22 to move via the two wheel frames 21, so that the two tensioning wheels 22 lift and tension the chain 7.

[0025] The main functions achieved by this utility model are:

[0026] 1. It can simultaneously adjust the distance between two forks, and can also independently adjust the position of a single fork, offering good flexibility;

[0027] 2. There is no limitation on the length of the hydraulic cylinder, allowing for a greater adjustable stroke of the two forks;

[0028] 3. A movable tension wheel assembly is installed to ensure stable tension of chain 7.

[0029] This utility model discloses a quick-adjustment device for forks on off-road forklifts. Its installation, connection, or setting methods are all common mechanical methods, and any method that can achieve its beneficial effect can be implemented. The fork carriage 1, slide rail 2, left fork 3, right fork 4, sprocket shaft 5, sprocket 6, chain 7, worm gear 8, shaft 9, worm 10, handwheel 11, rack 14, gear 15, slide groove 19, and tension wheel 22 of this utility model are commercially available. Technical personnel in this industry only need to install and operate it according to the accompanying instruction manual, without requiring any creative work from those skilled in the art.

[0030] All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0031] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A quick fork spacing adjustment device for an off-road forklift, comprising a fork carriage (1), a slide rail (2), a left fork (3), and a right fork (4), wherein the slide rail (2) is mounted on the front end face of the fork carriage (1), and the left fork (3) and right fork (4) are slidably mounted on the slide rail (2); characterized in that, It also includes two sprocket shafts (5), two sprockets (6), a chain (7) and a chain locking assembly. The two sprocket shafts (5) are rotatably mounted on the left and right sides of the front end face of the fork carriage (1). The two sprockets (6) are concentrically mounted on the two sprocket shafts (5). The chain (7) is connected and fitted on the two sprockets (6). The chain locking assembly is installed on both the left fork (3) and the right fork (4). The chain locking assembly is used to lock or release the chain (7).

2. The quick-adjustment device for forks of an off-road forklift as described in claim 1, characterized in that, It also includes a worm gear (8), a shaft (9) and a worm (10). The worm gear (8) is concentrically mounted on the sprocket shaft (5), the shaft (9) is rotatably mounted on the fork carriage (1), and the worm (10) is concentrically mounted on the shaft (9). The worm (10) meshes with the worm gear (8).

3. The quick-adjustment device for forks of an off-road forklift as described in claim 2, characterized in that, It also includes a drive component, which is a handwheel (11) mounted on a shaft (9).

4. The quick-adjustment device for forks of an off-road forklift as described in claim 1, characterized in that, The chain assembly includes a slider (12), a pin (13), a rack (14), a gear (15), and a handle (16). The slider (12) is slidably mounted on the rear side wall of the left fork (3). The pin (13) is mounted on the end of the slider (12). The rack (14) is mounted on the side wall of the slider (12). The gear (15) is rotatably mounted on the left fork (3). The gear (15) meshes with the rack (14). One end of the handle (16) is connected to the gear (15).

5. The quick-adjustment device for forks of an off-road forklift as described in claim 1, characterized in that, The chain assembly includes a second slider (17), a second pin (18), a slide groove (19), and a push rod (20). The second slider (17) is slidably mounted on the rear side wall of the left fork (3). The second pin (18) is mounted on the end of the second slider (17). The slide groove (19) is mounted on the left fork (3). The push rod (20) is slidably mounted in the slide groove (19). An inclined slide is provided in the middle of the second slider (17). The middle of the push rod (20) is inclined and is slidably inserted into the inclined slide of the second slider (17).

6. The quick-adjustment device for forks of an off-road forklift as described in claim 1, characterized in that, It also includes two wheel frames (21) and two tension wheels (22). The two wheel frames (21) are respectively mounted on the left fork (3) and the right fork (4). The two tension wheels (22) are respectively rotatably mounted on the two wheel frames (21). The two tension wheels (22) are connected and engaged with the chain (7).

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