Side shift and distance adjustment device and fork lift truck

Abstract

The application relates to a side shift distance adjusting device and a forklift, and relates to the technical field of forklifts. The side shift distance adjusting device comprises a mounting frame, a fork assembly and a driving assembly. The mounting frame is used for mounting on the forklift. The fork assembly comprises two fork mounting seats. Each fork mounting seat is movably mounted on the mounting frame in the horizontal direction. The driving assembly comprises two driving oil cylinders and a hydraulic driving structure. The two driving oil cylinders are arranged on the mounting frame and are respectively drivingly connected with the two fork mounting seats. The hydraulic driving structure is communicated with the two driving oil cylinders and is used for driving at least one fork mounting seat to move in the horizontal direction. The hydraulic driving mode can ensure that the fork can be reliably adjusted in position under a load state. Meanwhile, the hydraulic driving structure can control the oil paths of the two driving oil cylinders in different combination modes. The three functions of distance adjustment, side shift and single fork independent adjustment can be simultaneously realized in the same device, so that the problem of single function of the side shift distance adjusting device of the existing forklift is solved.

Description

Technical Field

[0001] This application relates to the field of forklift technology, and in particular to a side shift adjustment device and a forklift. Background Technology

[0002] Forklifts, widely used industrial handling vehicles in warehousing, logistics, factory workshops, and port terminals, primarily use forks mounted at the front of the vehicle to pick up, move, and stack goods. In actual operation, due to significant differences in the dimensions of goods of different specifications, the spacing between the forks often needs frequent adjustment to accommodate goods of varying widths. Simultaneously, to accurately align goods or pallets, the forks also need to be moved laterally in the horizontal direction. Therefore, a lateral shifting device that combines forklift spacing adjustment and lateral shifting functions is of great significance for improving forklift operating efficiency and expanding its applicability.

[0003] Existing side-shift adjustment devices are generally installed on the forklift mast or fork carriage to move the forks horizontally. They primarily use a drive mechanism to move the two forks towards or away from each other to adjust the distance between them, thus accommodating the handling needs of goods of different widths. Alternatively, they can move the two forks as a whole in the same direction to achieve lateral shifting, facilitating lateral alignment of the forklift without significant adjustments to the vehicle's position. However, existing side-shift adjustment devices typically only achieve synchronous fork spacing and / or synchronous lateral shifting, making it difficult to independently adjust individual forks, resulting in a relatively limited functionality. Summary of the Invention

[0004] To address the issue of limited functionality in existing forklift side shift adjustment devices, this application provides a side shift adjustment device.

[0005] Firstly, the lateral displacement adjustment device provided in this application adopts the following technical solution: A lateral shift adjustment device for a forklift, the lateral shift adjustment device comprising: Mounting bracket for mounting on the forklift; A fork assembly includes two fork mounts, each of which is movably mounted horizontally on the mounting frame; The drive assembly includes two drive cylinders and a hydraulic drive structure. The two drive cylinders are mounted on the mounting bracket and are respectively drivenly connected to the two fork mounts. The hydraulic drive structure is connected to the two drive cylinders to drive at least one of the fork mounts to move horizontally.

[0006] By adopting the above technical solution, hydraulic cylinders offer advantages such as high output, stable operation, and rapid response. Therefore, using a hydraulic drive system ensures reliable fork position adjustment even under load, improving the practicality and reliability of the device. Furthermore, since each fork mount is driven by an independent hydraulic cylinder, the hydraulic drive structure can simultaneously achieve three functions—distance adjustment, lateral movement, and independent adjustment of individual forks—within the same device by controlling the hydraulic circuits of the two cylinders in different combinations. This enhances the flexibility of forklift fork adjustment, thus solving the problem of limited functionality in existing forklift lateral movement adjustment devices.

[0007] Optionally, the hydraulic drive structure includes an adjustable pitch reversing structure and a lateral displacement reversing structure. The adjustable pitch reversing structure is connected to the two drive cylinders through a first drive oil circuit to drive the two fork mounts to move towards or away from each other. The lateral displacement reversing structure is connected to the two drive cylinders through a second drive oil circuit to drive the two fork mounts to move in the same direction. The adjustable pitch reversing structure cooperates with the lateral displacement reversing structure to drive one of the fork mounts to move independently.

[0008] By adopting the above technical solution, and dividing the hydraulic drive structure into an adjustable reversing structure and a lateral reversing structure, the same device can achieve two different motion modes on the same hydraulic platform. Furthermore, through the coordinated control of the two reversing structures, independent movement of individual fork mounts is achieved, enabling both forks to adjust or laterally move synchronously, as well as allowing individual forks to move independently, thus improving the precision of fork position adjustment. In actual operation, the forklift can flexibly select its action mode based on the center position of the goods, pallet deviation, and cargo location conditions, thereby reducing the frequency of repeated corrections, improving loading and unloading efficiency, and enhancing adaptability under complex working conditions.

[0009] Optionally, the pitch-adjusting reversing structure includes a first working oil port and a second working oil port. The first driving oil circuit includes a first driving pipeline and a second driving pipeline. The first working oil port is connected to the rodless chamber of the two driving cylinders through the first driving pipeline, and the second working oil port is connected to the rod chamber of the two driving cylinders through the second driving pipeline.

[0010] By adopting the above technical solution, the first working oil port is simultaneously connected to the rodless chambers of the two drive cylinders through the first drive pipeline, and the second working oil port is simultaneously connected to the rod chambers of the two drive cylinders through the second drive pipeline. This ensures that the same type of chambers of the two drive cylinders are always supplied with and returned oil by the same working oil port. This guarantees the synchronicity and directional consistency of the movement of the two drive cylinders during the pitch adjustment operation, thereby ensuring that the two fork mounting seats can move synchronously towards or away from each other. This avoids the problem of asymmetrical fork spacing adjustment caused by the uncoordinated movement of the two drive cylinders, thus helping to improve the accuracy and stability of the pitch adjustment operation.

[0011] Optionally, a flow divider / combiner valve is provided on the first drive pipeline.

[0012] By adopting the above technical solution, and by setting a flow divider and combiner valve on the first drive pipeline, the flow of hydraulic oil entering the rodless chamber of the two drive cylinders can be precisely controlled to maintain a consistent flow rate. This solves the problem of inconsistent movement speeds of the two drive cylinders caused by differences in pipeline resistance and cylinder load. It helps to improve the motion synchronization accuracy of the two fork mounts during the distance adjustment operation, ensuring that the two forks move symmetrically relative to the centerline. This makes the positions of the two forks more precise and symmetrical after distance adjustment, improving the accuracy and reliability of the forklift in picking up goods during handling operations.

[0013] Optionally, the lateral shifting reversing structure includes a third working oil port and a fourth working oil port, the second driving oil circuit includes a third driving pipeline and a fourth driving pipeline, the third working oil port is connected to the rodless chamber of one of the driving cylinders through the third driving pipeline, and the fourth working oil port is connected to the rodless chamber of another driving cylinder through the fourth driving pipeline.

[0014] By adopting the above technical solution, the lateral shift reversing structure is independently connected to the rodless chambers of the two drive cylinders through the third and fourth drive lines. This allows the lateral shift reversing structure to perform differentiated hydraulic circuit control on the rodless chambers of the two drive cylinders, meaning that oil enters one rodless chamber while oil returns to the other, thus achieving differentiated movements of the two drive cylinders—one extending and the other retracting. This supports the co-directional movement of the two fork mounts, achieving overall lateral shift, and also provides a circuit basis for further independent adjustment on one side. Simultaneously, since the second drive hydraulic circuit of the lateral shift reversing structure is independent of the first drive hydraulic circuit of the pitch adjustment reversing structure, the pitch adjustment operation and the lateral shift operation can be controlled independently without interference, ensuring the reliability and stability of each function operation.

[0015] Optionally, both the pitch-adjusting reversing structure and the side-shifting reversing structure include an oil inlet and an oil return port; The drive assembly further includes an oil supply line and an oil return line. The oil supply line includes a main oil supply pipe and two branch oil supply pipes that are interconnected. The main oil supply pipe is used to connect to the oil supply device, and the two branch oil supply pipes are respectively connected to the two oil inlets. The oil return line includes a main oil return pipe and two branch oil return pipes that are interconnected. The two branch oil return pipes are respectively connected to the two oil return ports, and the main oil return pipe is used to connect to the oil return device.

[0016] By adopting the above technical solution and setting up oil supply and return lines, the two reversing structures can share the same oil supply and return system, thus avoiding the need to equip the two reversing structures with independent oil supply devices. This helps to simplify the overall pipeline layout of the hydraulic system, reduce the number of pipelines and connectors, and make the hydraulic system of the side shift adjustment device more compact and neat, making it easier to arrange in the limited installation space of the forklift.

[0017] Optionally, the drive assembly further includes a connecting pipeline and an overflow valve, wherein the main oil supply pipe is connected to the main oil return pipe through the connecting pipeline, and the overflow valve is located in the connecting pipeline.

[0018] By adopting the above technical solution, overpressure protection can be provided for the return oil pipeline of the hydraulic system. This ensures that the hydraulic oil pressure in the return oil pipeline can rise sharply in a short period, exceeding the safe pressure range of the pipeline and components. The relief valve opens promptly when the pressure in the return oil pipeline reaches a preset threshold, diverting the high-pressure hydraulic oil in the main return oil pipe to the main supply oil pipe for pressure relief. This prevents safety accidents such as pipeline rupture, seal damage, and component failure at the return port of the directional valve caused by overpressure, thus improving the safety and service life of the hydraulic system's return oil pipeline. Simultaneously, the relief valve diverts the high-pressure hydraulic oil in the main return oil pipe to the main supply oil pipe instead of directly discharging it to the outside, allowing the high-pressure hydraulic oil to circulate and dissipate within the system pipeline. This avoids hydraulic oil waste and environmental pollution caused by leakage, achieving a balance between overpressure protection and hydraulic oil recycling.

[0019] Optionally, the pitch switching structure and / or the lateral shifting structure both include a multi-way directional valve.

[0020] By adopting the above technical solutions, the number of independent valve bodies and their external pipeline connections can be reduced, resulting in a significant reduction in the number of components in the hydraulic system, a simpler and more compact pipeline layout, a reduced risk of leakage at pipeline connection points, and a more reasonable arrangement within the limited installation space of the forklift.

[0021] Optionally, the mounting bracket is provided with two guide rods, which are spaced apart vertically; and / or, The fork mounting bracket includes a fork mounting part and two fork limiting parts. The fork mounting part is used for mounting the forks, and the two fork limiting parts are arranged horizontally on both sides of the fork mounting part to restrict the movement of the forks in the horizontal direction.

[0022] By adopting the above technical solution and setting two guide rods, a double-layer guide support can be provided for the fork mount. This can improve the straightness and stability of the fork mount when it moves horizontally, prevent the fork mount from deflecting or tilting during adjustment or lateral movement, and ensure that the forks always maintain a horizontal and parallel posture. This helps to improve the accuracy and safety of the forklift when picking up goods. It can also form a double-fulcrum constraint structure, increase the support span of the fork mount, effectively distribute the bending moment and torque load on the fork mount, improve the load-bearing capacity and durability of the guide structure, and help extend the service life of the mating surfaces of the guide rods and the fork mount. By setting two fork limiting parts on both sides of the fork mounting part, after the forks are installed in the fork mounting part, the two fork limiting parts clamp and limit the forks from both sides in the horizontal direction, preventing the forks from swaying, deviating or falling off in the horizontal direction due to factors such as the weight of the cargo, vibration from bumps or acceleration and deceleration during the handling operation. This ensures the stability and reliability of the fork's installation position on the fork mounting seat and helps to improve the safety of the forklift in handling operations.

[0023] Secondly, the forklift provided in this application adopts the following technical solution: A forklift includes a chassis and a lateral shift adjustment device mounted on the chassis. The lateral shift adjustment device includes: a mounting bracket for mounting the forklift; a fork assembly including two fork mounting seats, each of the fork mounting seats being movably mounted horizontally on the mounting bracket; and a drive assembly including two drive cylinders and a hydraulic drive structure. The two drive cylinders are disposed on the mounting bracket and are respectively drivenly connected to the two fork mounting seats. The hydraulic drive structure is connected to the two drive cylinders for driving at least one of the fork mounting seats to move horizontally.

[0024] In summary, this application includes at least one of the following beneficial technical effects: 1. By setting up a mounting frame, two horizontally movable fork mounting seats, two drive cylinders respectively connected to the two fork mounting seats, and a hydraulic drive structure connected to the two drive cylinders, three functions can be realized in the same set of side shift adjustment device: fork offset adjustment, overall fork side shift, and independent adjustment of individual forks. This effectively solves the problem of the single function of existing forklift side shift adjustment devices, and significantly improves the flexibility of fork position adjustment, the forklift's adaptability to different goods, and the actual loading and unloading efficiency. 2. By dividing the hydraulic drive structure into a pitch adjustment reversing structure and a lateral shift reversing structure, and controlling two drive cylinders through independent first and second drive oil circuits, it is possible to achieve the opposite or opposite movement of the two fork mounts to complete the pitch adjustment, the same-direction movement of the two fork mounts to complete the lateral shift, and the individual movement of a single fork mount can be achieved through the coordinated cooperation of the two reversing structures. This improves the precision of fork adjustment control, reduces the frequency of repeated adjustments to the overall vehicle position, and enhances the accuracy and stability of operation under complex working conditions. 3. By setting up structures such as a first working oil port, a second working oil port, a flow divider and combiner valve, an oil supply line, an oil return line, a guide rod, and a fork limiting part, the synchronicity and oil supply and return stability of the two drive cylinders during the adjustment process can be improved, the guiding accuracy, load-bearing stability, and fork installation reliability during the movement of the fork mounting seat can be enhanced, thereby further improving the operational stability, safety, durability, and long-term operational reliability of the side shift adjustment device. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the lateral displacement adjustment device provided in this application; Figure 2 yes Figure 1 A front view schematic diagram of the lateral displacement adjustment device in the diagram; Figure 3 yes Figure 1 A rear view schematic diagram of the lateral shift adjustment device in the middle; Figure 4 yes Figure 1 A schematic diagram of the hydraulic drive structure in the diagram; Figure 5 yes Figure 1 A schematic diagram of the flow direction of the hydraulic drive structure (during pitch adjustment); Figure 6 yes Figure 1 A schematic diagram of the flow direction of the hydraulic drive structure (during lateral displacement); Figure 7 yes Figure 1 A schematic diagram of the first flow direction of the hydraulic drive structure (individually adjustable) in the middle; Figure 8 yes Figure 1 A schematic diagram of the second flow direction of the hydraulic drive structure (individually adjustable); Figure 9 yes Figure 1 A schematic diagram of the third flow direction of the hydraulic drive structure (individually adjustable) in the middle; Figure 10 yes Figure 1 A schematic diagram of the fourth flow direction of the hydraulic drive structure (individually adjustable) in the middle.

[0026] Explanation of reference numerals in the attached figures: 100. Lateral shift adjustment device; 1. Mounting bracket; 2. Fork assembly; 21. Fork mounting seat; 21a. Left mounting seat; 21b. Right mounting seat; 211. Fork mounting part; 212. Two fork limiting parts; 3. Drive assembly; 31. Drive cylinder; 31a. First cylinder; 31b. Second cylinder; 311. Rod chamber; 312. Rodless chamber; 32. Hydraulic drive structure; 321. Adjustment and reversing structure; 322. Lateral shift and reversing structure; 323. First drive oil circuit 3231, First drive line; 3232, Second drive line; 324, Diverter / combiner valve; 325, Second drive oil circuit; 3251, Third drive line; 3252, Fourth drive line; 326, Oil supply line; 3261, Main oil supply pipe; 3262, Branch oil supply pipe; 327, Return oil line; 3271, Main return oil pipe; 3272, Branch return oil pipe; 328, Connecting line; 3281, Overflow valve; 329, Check valve; 4, Guide rod; 41, Fixing part. Detailed Implementation

[0027] The following is in conjunction with the appendix Figure 1 -Appendix Figure 10 This application will be described in further detail below.

[0028] In one embodiment of this application, please refer to Figures 1 to 4 A lateral shift adjustment device 100 is used for a forklift. The lateral shift adjustment device 100 includes a mounting frame 1, a fork assembly 2, and a drive assembly 3. The mounting frame 1 is used to install on the forklift. The fork assembly 2 includes two fork mounting seats 21, each of which is movably mounted on the mounting frame 1 in a horizontal direction. The drive assembly 3 includes two drive cylinders 31 and a hydraulic drive structure 32. The two drive cylinders 31 are located on the mounting frame 1 and are respectively driven connected to the two fork mounting seats 21. The hydraulic drive structure 32 is connected to the two drive cylinders 31 and is used to drive at least one fork mounting seat 21 to move horizontally.

[0029] It should be noted that the mounting frame 1 is the basic support structure of the side-shift adjustment device 100. It has a plate-like or frame-like structure and is used to install on the mast or fork carriage of the forklift, providing a stable mounting base for other components. The fork assembly 2 includes two fork mounting seats 21, each of which is horizontally movably mounted on the mounting frame 1 for fork installation and to drive the forks to move horizontally. The drive assembly 3 includes two drive cylinders 31 and a hydraulic drive structure 32. The two drive cylinders 31 are mounted on the mounting frame 1 and are respectively drivenly connected to the two fork mounting seats 21. The hydraulic drive structure 32 is connected to the two drive cylinders 31 to supply hydraulic oil to the two drive cylinders 31 and control the flow direction of the hydraulic oil, thereby driving at least one fork mounting seat 21 to move horizontally. Furthermore, by setting two horizontally movable fork mounts 21 on the mounting frame 1, and configuring a drive cylinder 31 for each fork mount 21, each fork mount 21 has an independent drive source. The hydraulic drive structure 32 is connected to the two drive cylinders 31. By controlling the inflow and outflow direction of hydraulic oil in the two drive cylinders 31, the extension and retraction states of the two drive cylinders 31 can be controlled respectively, thereby driving the corresponding fork mount 21 to move horizontally. When the hydraulic drive structure 32 controls the two drive cylinders 31 to extend and retract synchronously in opposite directions, the two fork mounts 21 move towards or away from each other, realizing the pitch adjustment function; when the hydraulic drive structure 32 controls the two drive cylinders 31 to extend and retract synchronously in the same direction, the two fork mounts 21 move in the same direction, realizing the lateral movement function; when the hydraulic drive structure 32 controls only one drive cylinder 31 to extend and retract while the other remains stationary, the independent movement of a single fork mount 21 can be achieved.

[0030] In this embodiment, hydraulic cylinders are used because they offer advantages such as high output, smooth operation, and rapid response. This hydraulic drive ensures that the forks can reliably adjust their position even under load, improving the practicality and reliability of the device. Furthermore, since each fork mounting base 21 is driven by an independent drive cylinder 31, the hydraulic drive structure 32 can simultaneously achieve three functions—distance adjustment, lateral movement, and independent adjustment of individual forks—within the same device by controlling the hydraulic circuits of the two drive cylinders 31 in different combinations. This enhances the flexibility of forklift fork adjustment. This solves the problem of the limited functionality of existing forklift lateral movement adjustment devices 100.

[0031] In one embodiment of this application, please refer to Figures 4 to 7The hydraulic drive structure 32 includes a pitch-adjusting reversing structure 321 and a side-shifting reversing structure 322. The pitch-adjusting reversing structure 321 is connected to two drive cylinders 31 through a first drive oil circuit 323 to drive two fork mounts 21 to move towards or away from each other. The side-shifting reversing structure 322 is connected to two drive cylinders 31 through a second drive oil circuit 325 to drive two fork mounts 21 to move in the same direction. The pitch-adjusting reversing structure 321 and the side-shifting reversing structure 322 cooperate to drive one fork mount 21 to move independently.

[0032] It should be noted that the pitch-adjusting reversing structure 321 is a hydraulic control element in the hydraulic drive structure 32 used to realize the pitch-adjusting function. It can be a solenoid reversing valve, a manual reversing valve, or a hydraulically controlled reversing valve, etc. The pitch-adjusting reversing structure 321 changes the flow direction of hydraulic oil by switching the valve core position, thereby controlling the extension and retraction direction of the two drive cylinders 31. The first drive oil circuit 323 is a hydraulic pipeline system connecting the pitch-adjusting reversing structure 321 and the two drive cylinders 31, used to distribute the hydraulic oil output by the pitch-adjusting reversing structure 321 to the two drive cylinders 31 and realize the synchronous reverse extension and retraction of the two drive cylinders 31. The lateral shift reversing structure 322 is a hydraulic control element in the hydraulic drive structure 32 used to realize the lateral shift function. It can use the same or different types of reversing valve as the pitch reversing structure 321. The lateral shift reversing structure 322 is connected to two drive cylinders 31 through the second drive oil circuit 325 to control the two drive cylinders 31 to extend and retract synchronously in the same direction, driving the two fork mounts 21 to move in the same direction. The pitch reversing structure 321 cooperates with the lateral shift reversing structure 322 to drive one of the fork mounts 21 to move independently.

[0033] Furthermore, the pitch-adjusting reversing structure 321 is connected to the two drive cylinders 31 via the first drive oil circuit 323. When the pitch-adjusting reversing structure 321 works alone, hydraulic oil enters the two drive cylinders 31 simultaneously via the first drive oil circuit 323, causing the two drive cylinders 31 to extend and retract synchronously. This drives the two fork mounting seats 21 to move closer together or further apart, thereby increasing or decreasing the distance between the two forks. The side-shifting reversing structure 322 is connected to the two drive cylinders 31 via the second drive oil circuit 325. When the side-shifting reversing structure 322 works alone, hydraulic oil extends and retracts the two drive cylinders 31 in the same direction via the second drive oil circuit 325, thereby driving the two fork mounting seats 21 to move in the same direction, achieving lateral movement of the entire fork. When the pitch reversing structure 321 and the side shift reversing structure 322 work together, the oil receiving state or action sequence between the two drive cylinders 31 can be changed to make one fork mount 21 move while the other fork mount 21 remains stationary, thereby achieving the purpose of independent adjustment of a single fork mount 21.

[0034] In this embodiment, by dividing the hydraulic drive structure 32 into a pitch-adjusting reversing structure 321 and a lateral reversing structure 322, the same device can achieve two different motion modes under the same hydraulic platform. Furthermore, through the coordinated control of the two reversing structures, the independent movement of a single fork mount 21 is achieved, enabling both forks to adjust or laterally move synchronously, and also allowing individual forks to move independently, thus improving the precision of fork position adjustment. In actual operation, the forklift can flexibly select its action mode based on the center position of the goods, pallet deviation, and cargo location conditions, thereby reducing the frequency of repeated corrections, improving loading and unloading efficiency, and enhancing adaptability under complex working conditions.

[0035] In one embodiment of this application, please refer to Figure 5 The pitch-adjusting reversing structure 321 includes a first working port and a second working port. The first drive oil circuit 323 includes a first drive pipe 3231 and a second drive pipe 3232. The first working port is connected to the rodless chamber of the two drive cylinders 31 through the first drive pipe 3231, and the second working port is connected to the rod chamber of the two drive cylinders 31 through the second drive pipe 3232. The first and second working ports are ports on the pitch-adjusting reversing structure 321 used for outputting or recovering hydraulic oil. The first and second working ports alternate as hydraulic oil output ports or recovery ports depending on the position of the valve core of the pitch-adjusting reversing structure 321. The first drive pipe 3231 is a hydraulic pipe connecting the first working port to the rodless chamber of the two drive cylinders 31, used to guide the hydraulic oil output from the first working port to the rodless chamber of the two drive cylinders 31 or to guide the hydraulic oil in the rodless chamber back to the first working port. The second drive line 3232 is a hydraulic line connecting the second working port and the rod chamber of the two drive cylinders 31, used to guide the hydraulic oil output from the second working port to the rod chamber of the two drive cylinders 31 or to guide the hydraulic oil in the rod chamber back to the second working port.

[0036] Further, please refer to Figure 5When the pitch adjustment reversing structure 321 switches to the position where oil enters through the first working port and returns through the second working port, hydraulic oil simultaneously enters the rodless chambers of the two driving cylinders 31 from the first working port through the first drive pipeline 3231, pushing the piston rods of the two driving cylinders 31 to extend. At the same time, the hydraulic oil in the rod chambers of the two driving cylinders 31 flows back to the second working port through the second drive pipeline 3232. Since the two driving cylinders 31 drive the two fork mounting seats 21 respectively and are installed in opposite directions, when the two piston rods extend at the same time, they drive the two fork mounting seats 21 to move in opposite directions, realizing the pitch adjustment operation of opening the fork spacing. Conversely, when the pitch adjustment reversing structure 321 switches to the position where oil enters through the second working port and returns through the first working port, hydraulic oil simultaneously enters the rod chambers of the two drive cylinders 31 from the second working port via the second drive line 3232, pushing the piston rods of the two drive cylinders 31 to retract. Hydraulic oil in the rodless chamber flows back to the first working port via the first drive line 3231. When both piston rods retract simultaneously, they drive the two fork mounting seats 21 to move towards each other, achieving the pitch adjustment operation to reduce the fork spacing. It can be understood that during pitch adjustment, the side-shift reversing structure 322 is in the closed state, that is, the second drive line 325 is in the disconnected state.

[0037] In this embodiment, the first working oil port is simultaneously connected to the rodless chamber of the two drive cylinders 31 through the first drive pipe 3231, and the second working oil port is simultaneously connected to the rod chamber of the two drive cylinders 31 through the second drive pipe 3232. This ensures that the same type of chambers of the two drive cylinders 31 are always supplied with and returned oil through the same working oil port. This guarantees the synchronicity and directional consistency of the movement of the two drive cylinders 31 during the pitch adjustment operation, thereby ensuring that the two fork mounting seats 21 can move synchronously towards or away from each other. This avoids the problem of asymmetrical fork spacing adjustment caused by the uncoordinated movement of the two drive cylinders 31, thus helping to improve the accuracy and stability of the pitch adjustment operation.

[0038] In one embodiment of this application, the first drive pipeline 3231 includes a first drive main pipe and two first drive branch pipes that are interconnected. The first drive main pipe is connected to a first working oil port, and the two first drive branch pipes are respectively connected to the rodless chambers of two drive cylinders 31. Thus, by setting the first drive main pipe and the two first drive branch pipes, a distribution pipeline structure is formed, which enables one working oil port to efficiently supply oil synchronously to the rodless chambers of the two drive cylinders 31, which helps to form a stable dual-cylinder linkage foundation.

[0039] In one embodiment of this application, the second drive pipeline 3232 includes a second drive main pipe and two second drive branch pipes that are interconnected. The second drive main pipe is connected to a second working oil port, and the two second drive branch pipes are respectively connected to the rod chambers of the two drive cylinders 31. Thus, by providing the second drive main pipe and the two second drive branch pipes, the oil supply control of the pitch-adjusting reversing structure 321 to the rod chambers of the two drive cylinders 31 becomes more centralized and clear, thereby constructing a complete bidirectional pitch-adjusting hydraulic circuit. This enables the two fork mounts 21 to maintain good synchronization during pitch-adjusting reverse movements, reducing response differences caused by different control paths.

[0040] In one embodiment of this application, please refer to Figure 4 A flow divider / combiner valve 324 is provided on the first drive line 3231. The flow divider / combiner valve 324 is a hydraulic flow control element, which can be an equal-volume flow divider / combiner valve 324 or a proportional flow divider / combiner valve 324. The flow divider / combiner valve 324 has one oil inlet and two oil outlets, or two oil inlets and one oil outlet. It is equipped with a flow distribution mechanism inside, which can evenly distribute the incoming hydraulic oil into two equal or proportional outputs in the flow divider operation state, and merge the two hydraulic oils into one output in the flow combiner operation state. Furthermore, when the pitch-adjusting reversing structure 321 operates, allowing hydraulic oil to enter the first drive line 3231 through the first working port, the flow divider and combiner valve 324 is in a flow-dividing state, precisely and equally distributing the hydraulic oil in the first drive main pipe to the two first drive branch pipes. This ensures that the hydraulic oil flow rate entering the rodless chambers of the two drive cylinders 31 is strictly consistent, allowing the piston rods of the two drive cylinders 31 to extend at the same speed, ensuring that the speed and displacement of the two fork mounts 21 moving towards each other are completely synchronized. When the pitch-adjusting reversing structure 321 switches the direction, causing the hydraulic oil to flow back from the rodless chambers of the two drive cylinders 31, the flow divider and combiner valve 324 is in a flow-combining state, gathering the hydraulic oil flowing back from the two first drive branch pipes into the first drive main pipe. This ensures that the return flow rate of the rodless chambers of the two drive cylinders 31 is consistent, preventing the two fork mounts 21 from moving asynchronously due to the return speed of one drive cylinder 31 being faster than the other.

[0041] In this embodiment, by setting a flow divider and combiner valve 324 on the first drive line 3231, the flow distribution characteristic of the flow divider and combiner valve 324 is used to precisely control the flow of hydraulic oil entering the rodless chamber of the two drive cylinders 31 to be consistent. This can solve the problem of inconsistent movement speed of the two drive cylinders 31 caused by factors such as differences in pipeline resistance and cylinder load. It helps to improve the motion synchronization accuracy of the two fork mounting seats 21 during the distance adjustment operation, ensuring that the two forks move symmetrically relative to the center line. This makes the position of the two forks more accurate and symmetrical after distance adjustment, and improves the accuracy and reliability of the forklift in picking up goods during handling operations.

[0042] In one embodiment of this application, please refer to Figure 4 and Figure 6 The side-shift reversing structure 322 includes a third working port and a fourth working port. The second drive oil circuit 325 includes a third drive pipe 3251 and a fourth drive pipe 3252. The third working port is connected to the rodless chamber of one drive cylinder 31 via the third drive pipe 3251, and the fourth working port is connected to the rodless chamber of another drive cylinder 31 via the fourth drive pipe 3252. The third and fourth working ports are ports on the side-shift reversing structure 322 used for outputting or recovering hydraulic oil. The third and fourth working ports alternate as hydraulic oil output ports or recovery ports depending on the position of the valve core of the side-shift reversing structure 322. The third drive pipe 3251 is a hydraulic pipe connecting the third working port to the rodless chamber of one of the drive cylinders 31, and the fourth drive pipe 3252 is a hydraulic pipe connecting the fourth working port to the rodless chamber of the other drive cylinder 31. Further details can be found in the following section. Figure 6 When the lateral shifting reversing structure 322 switches to the position where oil enters through the third working port and returns through the fourth working port, hydraulic oil enters the rodless chamber of one drive cylinder 31 from the third working port via the third drive pipe 3251, pushing its piston rod to extend. Simultaneously, hydraulic oil in the rodless chamber of the other drive cylinder 31 flows back to the fourth working port via the fourth drive pipe 3252. Since the two drive cylinders 31 drive the two fork mounting seats 21 respectively and are installed in opposite directions, the piston rod of one drive cylinder 31 extends while the piston rod of the other drive cylinder 31 retracts, causing the two fork mounting seats 21 to move in the same direction, realizing the lateral shifting function of the forks as a whole. Conversely, when the lateral shifting reversing structure 322 switches to the position where oil enters through the fourth working port and returns through the third working port, the two fork mounting seats 21 move synchronously in opposite directions, realizing the lateral shifting of the forks to the other side. It is understandable that during lateral shift adjustment, the pitch reversing structure 321 is in the closed state, that is, the first drive oil circuit 323 is in the disconnected state.

[0043] In this embodiment, the lateral shift reversing structure 322 is independently connected to the rodless chambers of the two drive cylinders 31 via the third drive pipe 3251 and the fourth drive pipe 3252. This allows the lateral shift reversing structure 322 to perform differentiated hydraulic circuit control on the rodless chambers of the two drive cylinders 31, meaning that oil enters one rodless chamber while oil returns to the other, thus achieving differentiated movements of the two drive cylinders 31, one extending and the other retracting. This supports the co-directional movement of the two fork mounts 21, achieving overall lateral shift, and also provides a circuit basis for further independent adjustment on one side. Simultaneously, since the second drive hydraulic circuit 325 of the lateral shift reversing structure 322 and the first drive hydraulic circuit 323 of the pitch adjustment reversing structure 321 are independent of each other, the pitch adjustment operation and the lateral shift operation can be controlled independently without interference, ensuring the reliability and stability of each function operation.

[0044] Please see Figure 7 When the first cylinder 31a needs to drive the right mounting base 21b to move to the left independently, the pitch reversing structure 321 switches to the position where oil enters through the second working port and returns through the first working port. Simultaneously, the side-shifting reversing structure 322 switches to the position where oil enters through the fourth working port and returns through the third working port. The hydraulic oil from the pitch reversing structure 321 enters the rod chambers of both drive cylinders 31 simultaneously from the second working port through the second drive pipeline 3232. The hydraulic oil in the rodless chamber of the first cylinder 31a... The oil flows back to the third working port via the third drive line 3251, and back to the first working port via the diversion and combination valve 324 and the first drive line 3231. The hydraulic oil of the side shift reversing structure 322 flows back to the first working port via the fourth drive line 3252, with part flowing back to the first working port via the diversion and combination valve 324 and the first drive line 3231, and the other part flowing to the rodless chamber of the second cylinder 31b to cancel out the oil pressure in its rod chamber, so that the second cylinder 31b remains stationary.

[0045] Please see Figure 8When the first cylinder 31a needs to drive the right mounting base 21b to move to the right independently, the pitch-adjusting reversing structure 321 switches to the position where oil enters through the first working port and returns through the second working port. At the same time, the side-shifting reversing structure 322 switches to the position where oil enters through the third working port and returns through the fourth working port. The hydraulic oil from the pitch-adjusting reversing structure 321 flows from the first working port through the first drive line 3231 and the flow divider / combiner valve 324, and a portion of it flows with the side-shifting reversing structure 322 through the third drive line. After the hydraulic oil flowing into 3251 merges, it flows into the rodless chamber of the first cylinder 31a. Of the other part, one part flows to the rodless chamber of the second cylinder 31b, and the other part flows back to the fourth working port through the fourth drive line 3252. Meanwhile, the hydraulic oil in the rod chamber of the first cylinder 31a flows back to the second working port through the second drive line 3232, and the other part flows to the rod chamber of the second cylinder 31b to cancel out the oil pressure in its rodless chamber, so that the second cylinder 31b remains stationary.

[0046] Please see Figure 9 When the second cylinder 31b needs to drive the left mounting base 21a to move to the right independently, the pitch reversing structure 321 switches to the position where oil enters through the second working port and returns through the first working port. Simultaneously, the side-shifting reversing structure 322 switches to the position where oil enters through the third working port and returns through the fourth working port. The hydraulic oil from the pitch reversing structure 321 enters the rod chambers of both drive cylinders 31 simultaneously from the second working port through the second drive pipeline 3232. The hydraulic oil in the rodless chamber of the second cylinder 31b... The oil flows back to the fourth working port via the fourth drive line 3252, and back to the first working port via the diversion and combination valve 324 and the first drive line 3231. The hydraulic oil of the side-shift reversing structure 322 flows back to the first working port via the third drive line 3251 via the diversion and combination valve 324 and the first drive line 3231, and the other part flows to the rodless chamber of the second cylinder 31b to cancel out the oil pressure in its rod chamber, so that the first cylinder 31a remains stationary.

[0047] Please see Figure 10When the second cylinder 31b needs to drive the left mounting base 21a to move to the left independently, the pitch reversing structure 321 switches to the position where oil enters through the first working port and returns through the second working port. At the same time, the side shift reversing structure 322 switches to the position where oil enters through the fourth working port and returns through the third working port. The hydraulic oil from the pitch reversing structure 321 flows from the first working port through the first drive line 3231 and the flow divider / combiner valve 324, and a portion of it flows with the side shift reversing structure 322 through the fourth drive line. After the hydraulic oil flowing into 3252 merges, it flows into the rodless chamber of the second cylinder 31b. Of the other part, part flows to the rodless chamber of the first cylinder 31a, and the other part flows back to the third working port through the third drive line 3251. Meanwhile, the hydraulic oil in the rod chamber of the second cylinder 31b flows back to the second working port through the second drive line 3232, and the other part flows to the rod chamber of the first cylinder 31a to cancel out the oil pressure in its rodless chamber, so that the first cylinder 31a remains stationary.

[0048] In one embodiment of this application, please refer to Figure 4 Both the pitch reversing structure 321 and the lateral reversing structure 322 include an oil inlet and an oil return port. The drive assembly 3 also includes an oil supply line 326 and an oil return line 327. The oil supply line 326 includes an interconnected main oil supply line 3261 and two oil supply branch lines 3262. The main oil supply line 3261 is used to connect with the oil supply device, and the two oil supply branch lines 3262 are respectively connected to the two oil inlets. The oil return line 327 includes an interconnected main oil return line 3271 and two oil return branch lines 3272. The two oil return branch lines 3272 are respectively connected to the two oil return ports, and the main oil return line 3271 is used to connect with the oil return device. The hydraulic oil supply system connects the oil inlets of the pitch-adjusting reversing structure 321 and the lateral reversing structure 322 to the same oil supply device via oil supply line 326. The main oil supply line 3261 branches into two branch lines 3262, supplying oil to the pitch-adjusting reversing structure 321 and the lateral reversing structure 322 respectively. This allows the two reversing structures to share the same oil supply device without requiring separate oil sources. Hydraulic oil flowing from the supply device is collected via the main oil supply line 3261 and then redistributed to the two reversing structures, ensuring a stable hydraulic oil supply. Simultaneously, the return oil line 327 connects the return oil inlets of the two reversing structures to the same return oil device. The two return oil branch lines 3272 collect the hydraulic oil returning from each reversing structure into the main return oil line 3271 and then discharge it into the return oil device, achieving centralized recovery of hydraulic oil. Thus, by setting up the oil supply line 326 and the oil return line 327, the two reversing structures can share the same oil supply and return system, so as to avoid equipping the two reversing structures with independent oil supply devices. This helps to simplify the overall pipeline layout of the hydraulic system, reduce the number of pipelines and connectors, and make the hydraulic system of the side shift adjustment device 100 more compact and neat, which is convenient for arrangement in the limited installation space of the forklift.

[0049] In one embodiment of this application, a one-way valve 329 is provided on the main oil supply pipe 3261. After the hydraulic oil flows out from the oil supply device, it enters the main oil supply pipe 3261 through the one-way valve 329 and continues to be distributed to the two oil supply branch pipes 3262 and the corresponding reversing structure. Since the one-way valve 329 only allows the hydraulic oil to flow from the direction of the oil supply device to the direction of the reversing structure and prevents reverse flow, when the oil supply device stops working or pressure fluctuation occurs in the oil supply line 326, the one-way valve 329 can effectively prevent the high-pressure hydraulic oil in the reversing structure and the drive cylinder 31 from flowing back to the oil supply device through the oil supply line 326, thereby maintaining the oil pressure in the drive cylinder 31 stable, preventing the piston rod of the drive cylinder 31 from undergoing unexpected displacement due to oil pressure loss, and ensuring that the fork mounting seat 21 can still remain in the set position without slippage after the oil supply device stops working. Thus, by setting a one-way valve 329, a reliable anti-backflow protection function can be provided for the hydraulic system, preventing the hydraulic oil in the drive cylinder 31 from leaking backward through the oil supply line 326 when the oil supply device stops or the pipeline pressure fluctuates. This helps to ensure the pressure holding capacity of the drive cylinder 31 under static working conditions, so that the fork mounting seat 21 can be stably kept in the adjusted position without slipping due to the drop in oil pressure caused by hydraulic oil backflow, thereby improving the safety and reliability of the forklift in handling operations.

[0050] In one embodiment of this application, please refer to Figure 4The drive assembly 3 also includes a connecting pipe 328 and a relief valve 3281. The main oil supply pipe 3261 is connected to the main oil return pipe 3271 through the connecting pipe 328, and the relief valve 3281 is located in the connecting pipe 328. During normal operation of the hydraulic system, the hydraulic oil pressure in the main oil return pipe 3271 is within the normal range and lower than the preset opening pressure of the relief valve 3281. The relief valve 3281 remains closed. The hydraulic oil flows from the return port of the reversing structure through the return branch pipe 3272 into the main oil return pipe 3271 and is then normally discharged back to the return device. There is no hydraulic oil flowing in the connecting pipe 328. The supply pipe 326 and the return pipe 327 operate independently without affecting each other. When the pressure in the return oil line 327 of the hydraulic system rises abnormally, causing the pressure in the return oil main pipe 3271 to reach the preset opening pressure of the relief valve 3281, the relief valve 3281 opens. The high-pressure hydraulic oil in the return oil main pipe 3271 overflows from the return oil main pipe 3271 to the supply oil main pipe 3261 through the connecting pipe 328, and then is diverted and dissipated or returned to the oil supply device by the supply oil main pipe 3261. This limits the hydraulic oil pressure in the return oil main pipe 3271 to below the preset value of the relief valve 3281 and prevents it from continuing to rise, thus avoiding the rupture or damage of the pipelines and components in the return oil line 327 due to excessive hydraulic pressure. Thus, by setting up a connecting pipe 328 with an overflow valve 3281, overpressure protection can be provided for the hydraulic system's return oil pipe 327. This ensures that if the hydraulic oil pressure in the return oil pipe 327 rises sharply in a short time, exceeding the safe pressure range of the pipe and components, the overflow valve 3281 will open promptly when the pressure in the return oil pipe 327 reaches a preset threshold. This diverts the high-pressure hydraulic oil in the return oil main pipe 3271 to the supply oil main pipe 3261 for pressure relief, preventing accidents such as pipe rupture, seal damage, and component failure at the directional valve return port due to overpressure in the return oil pipe 327. This helps improve the safety and service life of the hydraulic system's return oil pipe 327. Simultaneously, by diverting the high-pressure hydraulic oil in the return oil main pipe 3271 to the supply oil main pipe 3261 instead of directly discharging it to the outside, the high-pressure hydraulic oil circulates and dissipates within the system pipeline, avoiding hydraulic oil waste and environmental pollution caused by leakage. This achieves a balance between overpressure protection and hydraulic oil recycling.

[0051] In one embodiment of this application, both the pitch-adjusting reversing structure 321 and / or the side-shifting reversing structure 322 include multi-way directional valves. Both the pitch-adjusting reversing structure 321 and the side-shifting reversing structure 322 may employ multi-way directional valves, or only one of them may use a multi-way directional valve. Furthermore, the multi-way directional valve, by changing the position of its internal valve core, establishes different communication relationships between the inlet, working port, and return port, thereby selectively supplying hydraulic oil to the pitch-adjusting circuit or the side-shifting circuit. This allows the side-shifting pitch-adjusting device 100 to smoothly switch between various states such as pitch adjustment, side shifting, stop, and holding, thus meeting the specific control requirements of forklift operation. In this way, by using multi-way directional valves, the number of independent valve bodies and their external pipeline connections can be reduced, significantly reducing the number of components in the hydraulic system, resulting in a simpler and more compact pipeline layout. This reduces the risk of leakage at pipeline connection points and facilitates reasonable arrangement within the limited installation space of the forklift.

[0052] In one embodiment of this application, the mounting bracket 1 is provided with two guide rods 4, which are spaced apart vertically. When the drive cylinder 31 drives the fork mounting seat 21 to move, the fork mounting seat 21 slides linearly along the axial direction of the two guide rods 4. The two guide rods 4 serve as the movement track of the fork mounting seat 21, constraining the movement direction of the fork mounting seat 21 so that it can only move linearly in the horizontal direction, preventing the fork mounting seat 21 from deflecting, tilting, or shifting due to factors such as eccentric driving force or uneven loading of cargo weight during movement. The two guide rods 4, spaced apart vertically, form two upper and lower guide support points, constraining the fork mounting seat 21 at two positions, effectively resisting the overturning moment of the fork mounting seat 21 in the vertical direction. Thus, by setting two guide rods 4, double-layer guide support can be provided for the fork mount 21. This can improve the straightness and stability of the fork mount 21 when it moves horizontally, prevent the fork mount 21 from deflecting or tilting during adjustment or lateral movement, and ensure that the forks always maintain a horizontal and parallel posture. This helps to improve the accuracy and safety of the forklift when picking up goods. It can also form a double-fulcrum constraint structure, increase the support span of the fork mount 21, effectively disperse the bending moment and torque load on the fork mount 21, improve the load-bearing capacity and durability of the guide structure, and help extend the service life of the mating surfaces of the guide rods 4 and the fork mount 21.

[0053] In one embodiment of this application, a fixing part 41 is provided between the mounting bracket 1 and the guide rod 4. The fixing part 41 is located in the middle of the guide rod 4 and between the two fork mounts 21. This is equivalent to adding an intermediate support point in the length direction of the guide rod 4, changing the guide rod 4 from a double-end support structure supported only at both ends by the mounting bracket 1 to a multi-point support structure supported at both ends and in the middle. When the two fork mounts 21 move along the guide rod 4 under load, the fork mounts 21 apply bending loads to the guide rod 4 in the vertical and horizontal directions. Since the fixing part 41 provides additional support in the middle of the guide rod 4, the effective free span of the guide rod 4 is shortened, and the maximum bending moment borne by the guide rod 4 is significantly reduced. At the same time, the fixing part 41 is located between the two fork mounts 21 and will not interfere with the horizontal movement range of the fork mounts 21, allowing the fork mounts 21 to still move freely within their working stroke range. Thus, by setting the fixing part 41, the guide rod 4 can be reinforced in the middle, which can shorten the free cantilever length of the guide rod 4, reduce the bending deformation of the guide rod 4 under load conditions, and improve the rigidity and load-bearing capacity of the guide rod 4. This makes the guide rod 4 less prone to permanent bending deformation after bearing the bending moment load generated by the weight of the fork mount 21 and the cargo for a long time, thereby helping to extend the service life of the guide rod 4. It can also reduce the bending deformation of the guide rod 4, making the motion resistance of the fork mount 21 more uniform and stable when it moves along the guide rod 4, and making the movement process smoother, further improving the straightness and stability of the movement of the fork mount 21.

[0054] In one embodiment of this application, the fork mounting base 21 includes a fork mounting portion 211 and two fork limiting portions 212. The fork mounting portion 211 is used for mounting the forks, and the two fork limiting portions 212 are horizontally spaced on both sides of the fork mounting portion 211 to restrict the horizontal movement of the forks. After mounting, the forks are restricted on both sides of the fork mounting portion 211 along the horizontal direction by the two fork limiting portions 212. The two fork limiting portions 212 abut against the two horizontally positioned sides of the forks, preventing the forks from moving to either side in the horizontal direction, thereby fixing and constraining the forks at a predetermined position between the two fork limiting portions 212. Thus, by providing two fork limiting parts 212 on both sides of the fork mounting part 211, after the forks are installed in the fork mounting part 211, the two fork limiting parts 212 clamp and limit the forks from both sides in the horizontal direction, preventing the forks from swaying, deviating or falling off in the horizontal direction due to factors such as the weight of the goods, vibration from bumps or acceleration and deceleration during the handling operation, ensuring the stability and reliability of the fork installation position on the fork mounting seat 21, and helping to improve the safety of the forklift in the handling operation.

[0055] In one embodiment of this application, the two drive cylinders 31 include a first cylinder 31a and a second cylinder 31b. The first cylinder 31a and the second cylinder 31b are mounted on the mounting frame 1 at a vertical distance. The two fork mounts 21 include a left mounting mount 21a and a right mounting mount 21b, which are spaced apart in the left-right direction. The first cylinder 31a drives and connects to the right mounting mount 21b, and the second cylinder 31b drives and connects to the left mounting mount 21a. The vertical distance between the first cylinder 31a and the second cylinder 31b on the mounting frame 1 avoids the lateral space occupation problem caused by the two cylinders being arranged side-by-side in the horizontal direction. This allows the two cylinders to be staggered in the height direction of the mounting frame 1, making full use of the vertical space of the mounting frame 1. The first cylinder 31a drives the right mounting seat 21b, while the second cylinder 31b drives the left mounting seat 21a, forming a cross-drive connection. That is, the upper cylinder drives the right fork mounting seat 21, and the lower cylinder drives the left fork mounting seat 21. This cross-drive connection causes the piston rods of the two cylinders to extend in opposite directions. When the rodless chambers of both cylinders are simultaneously filled with oil and the piston rods extend simultaneously, the first cylinder 31a pushes the right mounting seat 21b to the right, while the second cylinder 31b pushes the left mounting seat 21a to the left. The two fork mounting seats 21 naturally move in opposite directions, achieving the offset adjustment function. Thus, by installing the first cylinder 31a and the second cylinder 31b at intervals along the vertical direction on the mounting frame 1, the two cylinders are arranged in a layered layout in the vertical direction, avoiding the problem of increased lateral dimensions caused by placing the two cylinders side-by-side in the horizontal direction. This makes the overall width of the side-shift offset device 100 more compact in the horizontal direction, facilitating installation within the limited space of the forklift mast or fork carriage. Meanwhile, the cross-drive layout of the first hydraulic cylinder 31a being driven to the right mounting base 21b and the second hydraulic cylinder 31b being driven to the left mounting base 21a allows the piston rods of the two hydraulic cylinders to naturally extend in opposite directions. When the pitch-adjusting reversing structure 321 supplies oil to the same type of cavity of the two hydraulic cylinders, the two fork mounting bases 21 can achieve synchronous movement towards or away from each other. The oil circuit connection method is simple and direct, and there is no need to set up an additional oil circuit crossing or movement direction conversion mechanism.

[0056] In one embodiment of this application, the drive end of each drive cylinder 31 is hinged to the corresponding fork mount 21. When the piston rod of the drive cylinder 31 extends or retracts, causing the fork mount 21 to move horizontally, there may be a slight angular deviation between the thrust direction of the piston rod and the actual movement direction of the fork mount 21. This angular deviation may originate from installation errors, parallelism deviation between the guide rod 4 and the cylinder, or slight offset of the fork mount 21 due to elastic deformation under load. Since the piston rod and the fork mount 21 are connected by a hinge, the piston rod can rotate at a small angle relative to the fork mount 21 at the hinge point to adapt, thereby absorbing and compensating for the above-mentioned angular deviation and avoiding the radial bending moment caused by the angular deviation. Thus, the drive end of the drive cylinder 31 is hinged to the fork mounting seat 21, giving the piston rod and the fork mounting seat 21 a certain degree of angular freedom. This effectively absorbs and compensates for the slight angular deviation between the piston rod thrust direction and the fork mounting seat 21 movement direction caused by machining and assembly errors, structural deformation, etc., avoiding bending fatigue damage to the piston rod caused by radial bending force. It also protects the piston rod and seals of the drive cylinder 31 from damage by non-axial forces, helping to extend the service life of the drive cylinder 31. Furthermore, it reduces the parallelism accuracy requirements between the installation position of the drive cylinder 31 and the guide rod 4 on the mounting frame 1, making the machining, manufacturing, assembly, and debugging of the mounting frame 1 more convenient and reducing manufacturing and installation costs.

[0057] To achieve the above objectives, this application also provides a forklift, which includes a vehicle body and a lateral shift adjustment device 100 mounted on the vehicle body. It is understood that the specific structure of the lateral shift adjustment device 100 is the same as described in the above embodiments. Since this forklift adopts all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon here.

[0058] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A lateral shift adjustment device for a forklift, characterized in that, The lateral shift adjustment device includes: Mounting bracket (1) for mounting on the forklift; The fork assembly (2) includes two fork mounts (21), each of which is movably mounted horizontally on the mounting frame (1); The drive assembly (3) includes two drive cylinders (31) and a hydraulic drive structure (32). The two drive cylinders (31) are mounted on the mounting frame (1) and are respectively driven connected to the two fork mounts (21). The hydraulic drive structure (32) is connected to the two drive cylinders (31) to drive at least one of the fork mounts (21) to move horizontally.

2. The lateral displacement adjustment device according to claim 1, characterized in that, The hydraulic drive structure (32) includes a pitch reversing structure (321) and a side shift reversing structure (322). The pitch reversing structure (321) is connected to the two drive cylinders (31) through a first drive oil circuit (323) to drive the two fork mounts (21) to move towards or away from each other. The side shift reversing structure (322) is connected to the two drive cylinders (31) through a second drive oil circuit (325) to drive the two fork mounts (21) to move in the same direction. The pitch reversing structure (321) and the side shift reversing structure (322) cooperate to drive one of the fork mounts (21) to move independently.

3. The lateral displacement adjustment device according to claim 2, characterized in that, The pitch-adjusting reversing structure (321) includes a first working oil port and a second working oil port. The first driving oil circuit (323) includes a first driving pipeline (3231) and a second driving pipeline (3232). The first working oil port is connected to the rodless chamber of the two driving cylinders (31) through the first driving pipeline (3231), and the second working oil port is connected to the rod chamber of the two driving cylinders (31) through the second driving pipeline (3232).

4. The lateral displacement adjustment device according to claim 3, characterized in that, The first drive line (3231) is equipped with a flow divider / combiner valve (324).

5. The lateral displacement adjustment device according to claim 2, characterized in that, The lateral shifting reversing structure (322) includes a third working oil port and a fourth working oil port. The second drive oil circuit (325) includes a third drive pipe (3251) and a fourth drive pipe (3252). The third working oil port is connected to the rodless chamber of one of the drive cylinders (31) through the third drive pipe (3251), and the fourth working oil port is connected to the rodless chamber of another drive cylinder (31) through the fourth drive pipe (3252).

6. The lateral displacement adjustment device according to claim 2, characterized in that, Both the pitch-adjusting reversing structure (321) and the side-shifting reversing structure (322) include an oil inlet and an oil return port; The drive assembly (3) further includes an oil supply line (326) and an oil return line (327). The oil supply line (326) includes an interconnected main oil supply line (3261) and two oil supply branch lines (3262). The main oil supply line (3261) is used to connect with the oil supply device, and the two oil supply branch lines (3262) are respectively connected to the two oil inlets. The oil return line (327) includes an interconnected main oil return line (3271) and two oil return branch lines (3272). The two oil return branch lines (3272) are respectively connected to the two oil return ports, and the main oil return line (3271) is used to connect with the oil return device.

7. The lateral displacement adjustment device according to claim 6, characterized in that, The drive assembly (3) further includes a connecting pipe (328) and an overflow valve (3281). The oil supply main pipe (3261) is connected to the oil return main pipe (3271) through the connecting pipe (328), and the overflow valve (3281) is located in the connecting pipe (328).

8. The lateral displacement adjustment device according to claim 2, characterized in that, Both the pitch switching structure (321) and / or the side-shifting switching structure (322) include a multi-way switching valve.

9. The lateral displacement adjustment device according to claim 1, characterized in that, The mounting bracket (1) is provided with two guide rods (4), which are spaced apart vertically; and / or, The fork mounting base (21) includes a fork mounting part (211) and two fork limiting parts (212). The fork mounting part (211) is used for mounting forks. The two fork limiting parts are arranged horizontally on both sides of the fork mounting part (211) to restrict the movement of forks in the horizontal direction.

10. A forklift, characterized in that, The device includes a vehicle body and a lateral displacement adjustment device mounted on the vehicle body, the lateral displacement adjustment device including the lateral displacement adjustment device according to any one of claims 1 to 9.

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