Pallet fork frame capable of adjusting positions of pallet forks and adjusting method

Abstract

The invention discloses a pallet fork frame capable of adjusting the positions of pallet forks, which comprises a portal frame, a mounting shaft, the pallet forks and a lateral movement distance adjusting device, the pallet forks and the lateral movement distance adjusting device are mounted on the portal frame through the mounting shaft, the two pallet forks are mounted on the mounting shaft in a sliding manner, and the position between the two pallet forks is adjusted through the lateral movement distance adjusting device; as the floating type pallet fork serves as a lateral movement distance adjusting changing object, a lateral movement and distance adjusting device can be additionally arranged on the basis of an original pallet fork frame, a lateral movement frame does not need to be additionally arranged, and the structure does not need to be greatly changed; the two hydraulic oil cylinders share an oil inlet and return path and are easy and convenient to control; the total weight of the fork arm carrier is slightly increased, and the loading capacity of the whole machine is slightly improved; the cost of the fork arm carrier with the lateral moving and distance adjusting functions can be reduced, meanwhile, the operation capacity of the whole machine is improved, and efficiency is improved.

Description

Technical Field

[0001] The present invention relates to a position adjustment of a forklift fork, and in particular to a fork frame capable of adjusting the position of the fork and an adjustment method. Background Art

[0002] A telescopic forklift is a versatile off-road forklift capable of loading, unloading, stacking, and short-distance transport of piece goods (or pallets), with extended reach. It is essential equipment for pallet and container transport.

[0003] Existing forklifts consist of a mast, mounting shaft, and forks. The forklift is the primary load-bearing structure of a telescopic forklift's pickup mechanism. The forks are mounted on the mounting shaft, which is in turn mounted on the mast. Due to varying fork spacing on pallets, the fork tines may need to be adjusted when loading and unloading different pallets. Depending on the location of the shelves, racking equipment against walls may not be placed close together, resulting in wasted space. Alternatively, small adjustments to the left and right position of the entire machine are complex, requiring the forks to be able to move left or right.

[0004] The use of side-shift adjustable forks effectively reduces the time required to manually adjust the fork tines or equipment, significantly improving work efficiency. The currently widely used side-shift adjustable fork solution uses a side-shift mast to achieve side-shift functionality, and then uses two hydraulic cylinders to independently control the two forks for distance adjustment. This solution uses multi-channel hydraulic control, requiring the addition of a hydraulic valve block to control different movements.

[0005] However, telescopic forklifts typically only have one hydraulic oil inlet and return port located at the front of the working mechanism. Implementing this solution requires customizing additional oil lines, which is complex and expensive. Furthermore, this approach significantly increases the weight of the fork carriage and its control complexity, which in turn reduces the overall load capacity of the machine. Summary of the Invention

[0006] In view of the problems existing in the above-mentioned prior art, the present invention provides a fork frame with adjustable fork position, which solves the problems of large structural changes, large increase in total weight and complex control of the fork frame with side shift and distance adjustment functions for telescopic arm forklifts; the fork frame comprises a door frame, a mounting shaft, a fork, and a side shift and distance adjustment device. The side shift and distance adjustment device is added to the mounting shaft of the original floating fork, and a limit block is welded on the sleeve of the fork. The side shift and distance adjustment device clamps the limit block to directly control the fork to slide on the mounting shaft, thereby realizing the side shift and distance adjustment functions; the side shift and distance adjustment device comprises a hydraulic cylinder, a limit groove, a hydraulic pipeline, a sliding functional component, etc., which solves the above-mentioned problems.

[0007] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a fork frame with adjustable fork position, comprising: a door frame, a mounting shaft, a fork, and a side shift distance adjustment device, wherein the fork and the side shift distance adjustment device are installed on the door frame through the mounting shaft, and the two forks are slidably installed on the mounting shaft, and the position between the two forks is adjusted by the side shift distance adjustment device.

[0008] Furthermore, the door frame includes: side panels, upper cross beams, lower cross beams, fixed plates, triangular adjustment plates, and connecting plates. The two side panels form a frame through the upper cross beams and the lower cross beams. The frame composed of the upper cross beams and the lower cross beams is installed on the telescopic arm of the telescopic arm forklift through the fixed plate and the triangular adjustment plate. The triangular adjustment plate is also hinged to the mounting shaft through the connecting plate.

[0009] Furthermore, the side shift distance adjustment device includes: a hydraulic cylinder, a cylinder sliding shaft, a mounting seat, and a cylinder limit seat. The two hydraulic cylinder output shafts are connected through the cylinder limit seat. The middle groove of the cylinder limit seat is clamped on the door frame. The two hydraulic cylinders are connected to the mounting seat through the cylinder sliding shaft. The two hydraulic cylinders can slide left and right along the cylinder sliding shaft. The mounting seat is installed on the door frame through the mounting shaft. The position of the fork on the mounting shaft is controlled by the movement of the hydraulic cylinder.

[0010] Furthermore, the hydraulic cylinder is slidably connected to the cylinder sliding shaft, the mounting seat is slidably connected to the cylinder sliding shaft, and the mounting seat is slidably connected to the mounting shaft.

[0011] Furthermore, the large chamber of the hydraulic cylinder on the left side of the gantry is connected to the small chamber of the hydraulic cylinder on the right side, and the small chamber of the left hydraulic cylinder is connected to the large chamber of the right hydraulic cylinder. There is only one hydraulic inlet and return oil line. Since the output shaft of the hydraulic cylinder is fixed, the cylinder body moves left and right when switching the inlet and return oil, so that the two hydraulic cylinders move synchronously.

[0012] Furthermore, the mounting seat is provided with a sliding hole for mounting the oil cylinder sliding shaft and the mounting shaft, and the cylinder body of the hydraulic oil cylinder is provided with a sliding ear for slidably mounting the oil cylinder sliding shaft.

[0013] Furthermore, the mounting seat includes two symmetrically arranged mounting plates, and each mounting plate is provided with a sliding hole for mounting the oil cylinder sliding shaft and the mounting shaft respectively.

[0014] Furthermore, the mounting seat is centrally arranged in the side shift distance adjustment device, that is, the mounting seat is arranged in the middle of the cylinder sliding shaft.

[0015] Furthermore, a plurality of limit grooves are provided on the cylinder body of the hydraulic cylinder, and a limit block corresponding to the upper limit groove of the cylinder body of the hydraulic cylinder is provided at the tail end of the sleeve of the fork.

[0016] Furthermore, the lengths and positions of the limit blocks at the tail ends of the sleeves of the two forks are different.

[0017] A method for adjusting a fork frame capable of adjusting the position of a fork, comprising: When the mast tilts to a certain angle, the fork limit block will slide out of one of the limit slots on the hydraulic cylinder. Due to the different lengths and positions of the limit blocks, the position of a fork can be adjusted individually by tilting the mast to different angles. When performing distance adjustment operation, adjust the side shift distance adjustment device to move the left fork to the specified position, then tilt the mast forward to a certain angle, the left fork limit block will be disengaged from the side shift distance adjustment device, and the position will be fixed; adjust the side shift distance adjustment device again to move the right fork to the specified position; after the adjustment is in place, vertically position the mast, and the limit block will be locked into the corresponding limit slot to complete the left and right position locking of the fork; After the distance adjustment is completed, the side shift operation can be carried out. When adjusting the side shift distance adjustment device, the hydraulic cylinder can simultaneously adjust the left and right forks to move left or right to complete the side shift function.

[0018] The beneficial effects of the present invention are as follows: for a floating fork as a modification object for side shifting and distance adjustment, a fork frame can be equipped with side shifting and distance adjustment devices on the basis of the original fork frame, without adding a side shift frame and significantly changing the structure; the two hydraulic cylinders share a common inlet and return oil circuit, which is simple to control; the total weight of the fork frame is slightly increased, which has a small impact on the load capacity of the entire machine; the cost of the fork frame with side shifting and distance adjustment functions can be reduced, while the operating capacity of the entire machine is increased and the efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the three-dimensional structure of the present invention Figure 1 ; Figure 2 Schematic diagram of the three-dimensional structure of the present invention Figure 2 ; Figure 3 This is a schematic diagram of the explosive structure of the side-shifting adjustable distance device; Figure 4 This is a schematic diagram of the installation structure of the hydraulic cylinder and the cylinder limit seat; Figure 5 It is a schematic diagram of the local structure of the fork; Figure 6 It is a schematic diagram of the cross-sectional structure of the present invention; In the figure: 1. Mast; 11. Side panel; 12. Upper crossbeam; 13. Lower crossbeam; 14. Fixed plate; 15. Triangular adjustment plate; 16. Connecting plate; 2. Mounting shaft; 3. Fork; 31. Limit block; 4. Side shift and distance adjustment device; 41. Hydraulic cylinder; 42. Cylinder sliding shaft; 43. Hydraulic hard pipe; 44. Mounting seat; 45. Cylinder limit seat. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention pertains. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0022] like Figure 1-6 As shown, a fork frame with adjustable fork position includes: a door frame 1, a mounting shaft 2, a fork 3, and a side shift distance adjusting device 4. The fork 3 and the side shift distance adjusting device 4 are installed on the door frame 1 through the mounting shaft 2, and the two forks 3 are slidably installed on the mounting shaft 2, and the position between the two forks 3 is adjusted by the side shift distance adjusting device 4.

[0023] like Figure 1-2 6, the door frame 1 includes: side panels 11, upper cross beams 12, lower cross beams 13, fixed plates 14, triangular adjustment plates 15, and connecting plates 16. The two side panels 11 form a frame through the upper cross beams 12 and the lower cross beams 13. The side panels 11 are provided with pin holes for installing the mounting shaft 2. The triangular adjustment plate 15 is provided with three hinge holes arranged in a triangle, one of which is installed on the lower cross beam 13, and one hinge hole is hinged to the mounting shaft 2 through the connecting plate 16. The hinge hole and the connecting plate 16 are connected by a pin shaft, and the last hinge hole is connected to the telescopic shaft of the telescopic forklift. The telescopic oil cylinder in the arm is connected, one end of the fixed plate 14 is hinged on the lower cross beam 13, and the other end is hinged on the telescopic arm of the telescopic arm forklift. A positioning bar is provided on the lower cross beam 13 for fixing the fixed plate 14 and the triangular adjustment plate 15. The hinge holes of the fixed plate 14, the triangular adjustment plate 15 and the lower cross beam 13 are provided with notches for installing the positioning bars to ensure that the fixed plate 14, the triangular adjustment plate 15 and the lower cross beam 13 will not rotate. A swinging structure is formed between the fixed plate 14, the triangular adjustment plate 15 and the connecting plate 16. The swing of the gantry 1 can be controlled by controlling the telescopic oil cylinder in the telescopic arm.

[0024] A support base is provided below the pin hole for mounting the shaft 2 on the side plate 11 , and the support base is fixed on the side plate 11 to improve the stress strength of the pin hole.

[0025] The pin hole for installing the pin shaft is a waist-shaped hole, so that it can move up and down to adjust the relative position of the side shift distance adjustment device 4 and the frame.

[0026] like Figure 1-4As shown, the side shift distance adjustment device 4 includes: a hydraulic cylinder 41, a cylinder sliding shaft 42, a hydraulic hard pipe 43, a mounting seat 44, and a cylinder limit seat. The output shafts of the two hydraulic cylinders 41 are connected through the cylinder limit seat. The middle groove of the cylinder limit seat is clamped on the connecting plate 16 of the door frame 1. The two hydraulic cylinders 41 are connected to the mounting seat 44 through the cylinder sliding shaft 42 and the hydraulic hard pipe 43. The two hydraulic cylinders 41 can slide left and right along the cylinder sliding shaft 42 and the hydraulic hard pipe 43. The mounting seat 44 is installed on the door frame 1 through the mounting shaft 2. The position of the fork 3 on the mounting shaft 2 is controlled by the movement of the hydraulic cylinder 41.

[0027] The hydraulic cylinder 41 is slidably connected to the cylinder sliding shaft 42 and the hydraulic hard pipe 43, the mounting seat 44 is slidably connected to the cylinder sliding shaft 42 and the hydraulic hard pipe 43, and the mounting seat 44 is slidably connected to the mounting shaft 2, ensuring convenience in installation and maintenance.

[0028] like Figure 2 As shown, the large chamber of the hydraulic cylinder 41 on the left side of the gantry 1 is connected to the small chamber of the hydraulic cylinder 41 on the right side, and the small chamber of the hydraulic cylinder 41 on the left side is connected to the large chamber of the hydraulic cylinder 41 on the right side. There is only one hydraulic inlet and return oil circuit. Since the output shaft of the hydraulic cylinder 41 is fixed, the cylinder body moves left and right when switching the inlet and return oil; and the two hydraulic cylinders 41 move synchronously through the sliding of the cylinder sliding shaft 42 and the hydraulic hard pipe 43.

[0029] The mounting seat 44 is provided with sliding holes for installing the cylinder sliding shaft 42, the hydraulic hard pipe 43, and the mounting shaft 2. The cylinder body of the hydraulic cylinder 41 is provided with sliding ears for slidingly installing the cylinder sliding shaft 42 and the hydraulic hard pipe 43, which is convenient for installation and subsequent maintenance and replacement.

[0030] like Figure 1 、 2 As shown in Figures 3 and 6, the mounting seat 44 includes two symmetrically arranged mounting plates to facilitate determination of the mounting position. Each mounting plate is provided with three sliding holes for mounting the cylinder sliding shaft 42, the hydraulic hard pipe 43, and the mounting shaft 2, respectively.

[0031] The mounting seat 44 is centrally arranged in the side shift distance adjustment device 4, that is, the mounting seat 44 is arranged in the middle of the cylinder sliding shaft 42 and the hydraulic hard pipe 43. A notch is provided on one side of the mounting plate in the mounting seat 44, and the notch is arranged at the cylinder limit seat to better ensure its installation position. At the same time, the two mounting plates are arranged on both sides of the connecting plate 16, which can further ensure the position of the side shift distance adjustment device 4.

[0032] like Figure 1-6 As shown, a plurality of limit grooves are provided on the cylinder body of the hydraulic cylinder 41 , and a limit block 31 corresponding to the upper limit groove of the cylinder body of the hydraulic cylinder 41 is provided at the tail end of the sleeve of the fork 3 .

[0033] like Figure 5 As shown, the lengths and positions of the limit blocks 31 at the sleeve tails of the two forks 3 are different, and the position of one fork 3 can be adjusted individually by tilting the mast 1 to different angles.

[0034] A method for adjusting a fork frame 3 capable of adjusting the position of a fork 3, comprising: When the mast 1 tilts to a certain angle, the limit block 31 of the fork 3 will slide out of one of the limit slots on the hydraulic cylinder 41. Due to the different lengths and positions of the limit block 31, the position of one fork 3 can be adjusted individually by tilting the mast 1 to different angles. When performing the distance adjustment operation, adjust the side shift distance adjustment device 4 to move the left fork 3 to the specified position, then tilt the mast 1 forward to a certain angle, so that the limit block 31 of the left fork 3 disengages from the side shift distance adjustment device 4 and the position is fixed; adjust the side shift distance adjustment device 4 again to move the right fork 3 to the specified position; after the adjustment is in place, vertically adjust the mast 1, and the limit block 31 is engaged in the corresponding limit slot to complete the left and right position locking of the fork 3; After the distance adjustment is completed, the side shift operation can be performed. When adjusting the side shift distance adjustment device 4, the left and right side forks 3 can be adjusted to move left or right at the same time through the hydraulic cylinder 41 to complete the side shift function.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A fork frame with adjustable fork position, characterized in that: include: The gantry, mounting shaft, fork and side shift distance adjusting device are installed on the gantry through the mounting shaft, the two forks are slidably installed on the mounting shaft, and the position between the two forks is adjusted by the side shift distance adjusting device.

2. A fork stand with adjustable fork position according to claim 1, characterized in that: The mast includes: Side panels, upper crossbeams, lower crossbeams, fixed plates, triangular adjustment plates, and connecting plates. The two side panels form a frame through the upper crossbeams and lower crossbeams. The frame composed of the upper crossbeams and lower crossbeams is installed on the telescopic arm of the telescopic arm forklift through the fixed plates and triangular adjustment plates. The triangular adjustment plates are also hinged to the mounting shaft through the connecting plates.

3. A fork frame with adjustable fork position according to claim 1, characterized in that: The side shifting distance adjustment device includes: a hydraulic cylinder, a cylinder sliding shaft, a mounting seat, and a cylinder limit seat. The two hydraulic cylinder output shafts are connected through the cylinder limit seat. The middle groove of the cylinder limit seat is clamped on the door frame. The two hydraulic cylinders are connected to the mounting seat through the cylinder sliding shaft. The two hydraulic cylinders can slide left and right along the cylinder sliding shaft. The mounting seat is installed on the door frame through the mounting shaft. The position of the fork on the mounting shaft is controlled by the movement of the hydraulic cylinder.

4. A fork frame with adjustable fork position according to claim 3, characterized in that: The hydraulic oil cylinder is slidably connected to the oil cylinder sliding shaft, the mounting seat is slidably connected to the oil cylinder sliding shaft, and the mounting seat is slidably connected to the mounting shaft.

5. A fork support with adjustable fork position according to claim 4, characterized in that: The large chamber of the hydraulic cylinder on the left side of the gantry is connected to the small chamber of the hydraulic cylinder on the right side, and the small chamber of the left hydraulic cylinder is connected to the large chamber of the right hydraulic cylinder. There is only one hydraulic inlet and return oil line. Because the output shaft of the hydraulic cylinder is fixed, the cylinder body moves left and right when switching the inlet and return oil, so that the two hydraulic cylinders move synchronously.

6. A fork carriage with adjustable fork position according to any one of claims 3 to 5, characterized in that: The mounting seat comprises two symmetrically arranged mounting plates, each of which is provided with a sliding hole for mounting the oil cylinder sliding shaft and the mounting shaft respectively.

7. A fork support with adjustable fork position according to claim 6, characterized in that: The mounting seat is centrally arranged in the side shift distance adjustment device, that is, the mounting seat is arranged in the middle of the oil cylinder sliding shaft.

8. The fork carriage with adjustable fork position according to claim 2, characterized in that: The cylinder body of the hydraulic oil cylinder is provided with a plurality of limit grooves, and the tail end of the sleeve of the fork is provided with a limit block corresponding to the upper limit groove of the cylinder body of the hydraulic oil cylinder.

9. A fork carriage with adjustable fork position according to claim 8, characterized in that: The lengths and positions of the limiting blocks at the tail ends of the sleeves of the two forks are different.

10. The method for adjusting a fork frame with adjustable fork position according to claim 9, characterized in that: Adjustment methods include: When the mast tilts to a certain angle, the fork limit block will slide out of one of the limit slots on the hydraulic cylinder. Due to the different lengths and positions of the limit blocks, the position of a fork can be adjusted individually by tilting the mast to different angles. When performing distance adjustment operation, adjust the side shift distance adjustment device to move the left fork to the specified position, then tilt the mast forward to a certain angle, the left fork limit block will be disengaged from the side shift distance adjustment device, and the position will be fixed; adjust the side shift distance adjustment device again to move the right fork to the specified position; after the adjustment is in place, vertically position the mast, and the limit block will be locked into the corresponding limit slot to complete the left and right position locking of the fork; After the distance adjustment is completed, the side shift operation can be carried out. When adjusting the side shift distance adjustment device, the hydraulic cylinder can simultaneously adjust the left and right forks to move left or right to complete the side shift function.

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