Heavy-load hydraulic chain transmission truck-mounted forklift device

Abstract

The utility model relates to the field of forklifts, and discloses a heavy-load hydraulic chain transmission truck-mounted forklift device which comprises a vertical beam frame, a walking fork and a cargo carrying fork, the bottom of the vertical beam frame is connected with the walking fork in an inserted mode, one end of the cargo carrying fork is fixedly connected with a guide wheel, and the side face of the vertical beam frame is connected with the cargo carrying fork in a sliding mode. The cargo carrying forks are slidably connected with the vertical beam frame through guide wheels and are parallel to the walking forks, a transmission assembly is arranged on the vertical beam frame and connected with the cargo carrying forks, the cargo carrying forks are provided with cargo carrying fork extending structures and are provided with a plurality of sets of magnetic attraction structures, and the cargo carrying forks can ascend and descend quickly and stably due to the design of the transmission assembly. The flexible walking mechanism is matched, loading and unloading operation of goods can be rapidly completed in a complex site environment, the lengthened goods carrying fork structure can be adjusted according to the size of the goods, the magnetic attraction structure can firmly attract the goods on a metal tray or a metal shell, and the goods are effectively prevented from sliding off due to vibration and inclination in the transportation process.

Description

TECHNICAL FIELD

[0001] The utility model relates to a forklift field, concretely is a heavy load hydraulic chain drive vehicle-mounted forklift device. BACKGROUND

[0002] The heavy load hydraulic chain drive vehicle-mounted forklift device is mainly applied to the loading and unloading scene of heavy maintenance equipment of troops, and when the transport vehicle breaks down in the transportation, the device can be pushed by manpower to realize the loading and unloading of heavy maintenance equipment such as an engine, can load goods from the ground to the transport vehicle compartment, and can also unload from the compartment to the designated position on the ground, improves the loading and unloading efficiency of equipment and materials, and has important significance for maintaining the combat effectiveness of troops.

[0003] The length of the fork of the conventional forklift is fixed, lacks flexible adjustment ability, leads to insufficient stability when transporting different specifications of goods, and thus affects the loading and unloading efficiency, and simultaneously, the existing forklift mainly relies on friction or simple mechanical limiting to fix goods, especially when transporting metal pallets or metal shell goods, goods are prone to sliding due to vibration or tilting, and there is a potential safety hazard, and therefore the heavy load hydraulic chain drive vehicle-mounted forklift device is provided. UTILITY MODEL CONTENTS

[0004] (I) technical problem solved

[0005] In view of the defects of the prior art, the utility model provides a heavy load hydraulic chain drive vehicle-mounted forklift device, which solves the above problems.

[0006] (II) technical scheme

[0007] In order to realize the above purposes, the utility model provides the following technical scheme: a heavy load hydraulic chain drive vehicle-mounted forklift device, including vertical beam frame, walking fork and load fork, the bottom of vertical beam frame is connected with walking fork through plug-in connection, one end of load fork is fixedly connected with guide wheel, the side surface of vertical beam frame is slidably connected with load fork, load fork is slidably connected with vertical beam frame through guide wheel, load fork and walking fork are in parallel relationship, transmission assembly is equipped on vertical beam frame, transmission assembly is connected with load fork, extension load fork structure is equipped on load fork, and multiple groups of magnetic attraction structures are equipped on load fork.

[0008] Preferably, the transmission assembly includes a transmission sprocket, a transmission chain, a battery and a hydraulic pump and a hydraulic cylinder, the bottom surface in the vertical beam frame is fixedly provided with the battery and the hydraulic pump, the battery and the hydraulic pump are provided with a pull rod and a foot pedal, the bottom surface in the vertical beam frame is provided with the hydraulic cylinder, the main body bottom surface of the hydraulic cylinder is fixedly connected with the vertical beam frame, the hydraulic cylinder and the battery and the hydraulic pump are connected in wiring, one end of the piston rod of the hydraulic cylinder is fixedly connected with a rotating shaft, one side of the cylindrical surface of the rotating shaft is fixedly connected with the hydraulic cylinder, both ends of the rotating shaft are rotatably connected with the transmission sprocket, the sprocket teeth of the transmission sprocket are connected with the transmission chain in a clamping mode, one end of the transmission chain is fixedly connected with the cargo fork, and the other end of the transmission chain is fixedly connected with the cross rod of the vertical beam frame.

[0009] Preferably, the lengthened cargo fork structure comprises a limiting plate, a lengthened plate, a sliding block plate and a C-shaped groove, one end of the lengthened plate is fixedly connected with the limiting plate, and the other end of the lengthened plate is fixedly connected with the sliding block plate; the end, away from the vertical beam frame, of the cargo fork is provided with a C-shaped groove penetratingly, the C-shaped groove is close to the top surface of the cargo fork, the lengthened plate is insertedly connected in the C-shaped groove, and the lengthened plate is slidably connected with the C-shaped groove; the sliding block plate is in the interior of the cargo fork, and the limiting plate is in the exterior of the cargo fork.

[0010] Preferably, the lengthened cargo fork structure further comprises a lead screw and a motor, a threaded hole penetratingly formed in the side, opposite to the limiting plate, of the sliding block plate, the inner wall of the cargo fork, connected with the vertical beam frame, is fixedly connected with the motor, the main body bottom surface of the motor is fixedly connected with the cargo fork, the output shaft of the lengthened plate is fixedly connected with the lead screw through a shaft coupling, the other end of the lead screw is rotatably connected with the inner wall of the C-shaped groove of the cargo fork, and the lead screw is threadedly connected with the threaded hole of the sliding block plate.

[0011] Preferably, the magnetic attraction structure comprises a square hole and a magnetic attraction block, the side, away from the lengthened plate, of the cargo fork is provided with a square hole penetratingly, and the magnetic attraction block is insertedly connected in the square hole.

[0012] Preferably, the magnetic attraction structure further comprises a cover plate, the cover plate is clampedly connected in the square hole, and the cover plate is on the side, away from the lengthened plate, of the magnetic attraction block.

[0013] (Three) beneficial effects

[0014] Compared with the prior art, the utility model provides a heavy load hydraulic chain transmission truck-mounted fork truck device, has the following beneficial effects:

[0015] 1. The heavy load hydraulic chain transmission vehicle-mounted fork truck device, the transmission assembly design enables the load fork to be quickly and stably lifted, and the flexible walking mechanism can quickly complete the loading and unloading operation of goods in a complex site environment, the load fork structure can be adjusted according to the size of the goods, the adaptability to different specifications of goods is greatly enhanced, the inconvenience caused by the fixed length of the fork is avoided, the loading and unloading time is reduced, and the overall work efficiency is improved.

[0016] 2. The heavy load hydraulic chain transmission vehicle-mounted fork truck device, the magnetic attraction structure can firmly attract metal tray or metal shell goods, effectively prevents goods from falling off due to vibration and inclination during transportation, eliminates potential safety hazards, the cooperation design of the guide wheel and the vertical beam frame ensures the stability of the load fork during lifting, and further improves the safety of goods transportation. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a structural schematic view of the utility model;

[0018] Figure 2 is an explosion schematic view of the utility model structure;

[0019] Figure 3 is a sectional view of the utility model extended load fork structure;

[0020] Figure 4 is Figure 3 is a local enlarged schematic view of A in the figure.

[0021] In the figure: 1, vertical beam frame; 2, walking fork; 3, load fork; 4, transmission sprocket; 5, transmission chain; 6, battery and hydraulic pump; 7, guide wheel; 8, hydraulic oil cylinder; 9, cover plate; 10, limit plate; 11, screw rod; 12, motor; 13, extension plate; 14, sliding block plate; 15, C-shaped groove; 16, square hole; 17, magnetic attraction block. DETAILED DESCRIPTION

[0022] The technical scheme in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0023] Please refer to Figures 1-4The utility model provides a kind of heavy load hydraulic chain drive truck-mounted fork truck device, including vertical beam frame 1, walking fork 2 and cargo fork 3, the bottom of vertical beam frame 1 is connected with walking fork 2, one end of cargo fork 3 is fixedly connected with guide wheel 7, the side surface of vertical beam frame 1 is slidably connected with cargo fork 3, cargo fork 3 is slidably connected with vertical beam frame 1 by guide wheel 7, cargo fork 3 is parallel with walking fork 2, transmission assembly is equipped on vertical beam frame 1, transmission assembly is connected with cargo fork 3, and extension cargo fork structure is equipped on cargo fork 3, and multiple groups of magnetic attraction structure are equipped on cargo fork 3.

[0024] Further, transmission assembly includes transmission sprocket 4, transmission chain 5, battery and hydraulic pump 6 and hydraulic cylinder 8, the bottom surface in vertical beam frame 1 is fixedly installed with battery and hydraulic pump 6, battery and hydraulic pump 6 are installed with pull rod and foot pedal, the bottom surface in vertical beam frame 1 is installed with hydraulic cylinder 8, the main body bottom surface of hydraulic cylinder 8 is fixedly connected with vertical beam frame 1, hydraulic cylinder 8 and battery and hydraulic pump 6 are connected, one end of the piston rod of hydraulic cylinder 8 is fixedly connected with rotating shaft, the cylindrical surface one side of rotating shaft is fixedly connected with hydraulic cylinder 8, both ends of rotating shaft are rotatably connected with transmission sprocket 4, the sprocket tooth of transmission sprocket 4 is connected with transmission chain 5, the side of vertical beam frame 1 away from cargo fork 3 is fixedly connected with cross bar, transmission sprocket 4 is above cross bar, one end of transmission chain 5 is fixedly connected with cargo fork 3, the other end of transmission chain 5 is fixedly connected on the cross bar of vertical beam frame 1, transmission sprocket 4 is used for clamping transmission chain 5, battery and hydraulic pump 6 are used for controlling hydraulic cylinder 8, the piston rod movement of hydraulic cylinder 8 makes transmission sprocket 4 move up and down, transmission chain 5 is used for connecting cargo fork 3 and vertical beam frame 1, transmission sprocket 4 moves up and down and rotates to control cargo fork 3 to move up and down.

[0025] Further, extension cargo fork structure includes limiting plate 10, extension plate 13, slider plate 14 and C-shaped groove 15, one end of extension plate 13 is fixedly connected with limiting plate 10, the other end of extension plate 13 is fixedly connected with slider plate 14, the end of cargo fork 3 away from vertical beam frame 1 is penetrated and is provided with C-shaped groove 15, the top surface of C-shaped groove 15 is close to cargo fork 3, extension plate 13 is insertedly connected in C-shaped groove 15, extension plate 13 is slidably connected with C-shaped groove 15, slider plate 14 is in the inside of cargo fork 3, limiting plate 10 is in the outside of cargo fork 3, extension plate 13 is used for connecting limiting plate 10 and slider plate 14, C-shaped groove 15 is used for inserting extension plate 13, extension plate 13 slides in C-shaped groove 15, limiting plate 10 is used for limiting extension plate 13 to move incompletely into cargo fork 3.

[0026] Further, the extension fork structure further comprises a screw rod 11 and a motor 12, a threaded hole is formed through the opposite side of the sliding block plate 14 relative to the limiting plate 10, the motor 12 is fixedly connected to the inner wall of the vertical beam frame 1 connected with the cargo fork 3, the main body bottom surface of the motor 12 is fixedly connected with the cargo fork 3, the output shaft of the extension plate 13 is fixedly connected with the screw rod 11 through a shaft coupling, the other end of the screw rod 11 is rotatably connected to the inner wall of the C-shaped groove 15 of the cargo fork 3, the screw rod 11 is threadedly connected with the threaded hole of the sliding block plate 14, the motor 12 is used for providing the rotating force of the screw rod 11, the screw rod 11 is connected with the threaded hole of the sliding block plate 14, when the screw rod 11 rotates, because the extension plate 13 and the C-shaped groove 15 are connected in plug manner, the screw rod 11 rotates to make the sliding block plate 14 slide on the screw rod 11, thereby driving the extension plate 13 to slide in the C-shaped groove 15, according to the size of the specific goods, the distance between the limiting plate 10 and the cargo fork 3 is adjusted, the upper plane of the limiting plate 10 is flush with the upper plane of the cargo fork 3, and the stability during the transportation of goods is ensured.

[0027] Further, the magnetic attraction structure comprises a square hole 16 and a magnetic attraction block 17, the square hole 16 is formed through the side of the cargo fork 3 away from the extension plate 13, the magnetic attraction block 17 is connected in plug manner in the square hole 16, the four sides of the magnetic attraction block 17 are fixedly connected with the square hole 16, the square hole 16 is used for mounting the magnetic attraction block 17, and the magnetic attraction block 17 is used for being magnetically connected with a metal tray, the tray is placed with goods, or is connected with goods of a metal shell, and the transportation stability is ensured.

[0028] Further, the magnetic attraction structure further comprises a cover plate 9, the cover plate 9 is connected in snap manner in the square hole 16, the cover plate 9 is on the side of the magnetic attraction block 17 away from the extension plate 13, the cover plate 9 is attached to the magnetic attraction block 17, and the cover plate 9 is used for covering the magnetic attraction block 17 and sealing the square hole 16 when the magnetic attraction block 17 is not used.

[0029] Structural description:

[0030] The vertical beam frame 1 has a certain length and height, has a space for mounting other components, supports the stability of the forklift itself, provides a mounting basis for the walking fork 2, the cargo fork 3, the transmission assembly and the like, and ensures that the overall structure of the forklift is stable during loading and unloading.

[0031] The walking fork 2 cooperates with the walking fork roller to realize the straight-line walking of the load, realizes the up-down transportation of the vehicle compartment of the forklift through the push-pull of the walking fork push-pull rod, is parallel to the cargo fork 3, and cooperates to complete the loading and unloading of goods.

[0032] The cargo fork 3 carries the load to move up and down to complete the loading and unloading operation of the goods; the extension fork structure and the magnetic attraction structure are arranged, and the adaptability and fixing effect to different goods are enhanced.

[0033] Transmission sprocket 4: round gear shape, with multiple sprocket teeth, clamping transmission chain 5, moving up and down and rotating when the hydraulic cylinder 8 piston rod drives the rotating shaft to move, thereby controlling the up and down movement of the cargo fork 3;

[0034] Transmission chain 5: chain structure, composed of multiple chain links, connecting the cargo fork 3 and the vertical beam frame 1, driven by the transmission sprocket 4, realizing the lifting movement of the cargo fork 3;

[0035] Battery and hydraulic pump 6: the battery supplies power to the hydraulic pump, and the hydraulic pump outputs pressure hydraulic oil to the hydraulic cylinder 8, providing power for the lifting of the cargo fork 3; provided with a drag lever and a foot pedal, which can manually press the hydraulic cylinder 8 to extend and retract when the battery is out of power;

[0036] Guide wheel 7: round, with hub and rim, can rotate around the shaft, symmetrically clamped on the "H" type channel steel, guiding the up and down movement of the cargo fork 3, while bearing the transverse load of the cargo fork 3, ensuring the stable lifting of the cargo fork 3;

[0037] Hydraulic cylinder 8: cylindrical, composed of cylinder, piston rod and other parts, under the control of the battery and hydraulic pump 6, the piston rod extends and retracts, driving the rotating shaft connected thereto, and then driving the transmission sprocket 4 to move, realizing the lifting of the cargo fork 3;

[0038] Cover plate 9: square thin plate, matching the size of square hole 16, covering magnetic block 17, when not using magnetic block 17, sealing square hole 16, protecting magnetic block 17 and preventing debris from entering;

[0039] Limiting plate 10: square plate structure, fixed at one end of extension plate 13, limiting the complete movement of extension plate 13 into cargo fork 3, and when the upper surface of cargo fork 3 is flush, ensuring stable transportation of goods;

[0040] Lead screw 11: slender rod shape, with threads on the surface, rotating under the drive of motor 12, cooperating with the screw hole of sliding block plate 14, sliding the sliding block plate 14 on the lead screw 11 through rotation, thereby driving the extension plate 13 to slide in the C-shaped groove 15 of the cargo fork 3, adjusting the length of the extended cargo fork;

[0041] Motor 12: provides power for the rotation of lead screw 11, realizes the adjustment of the extended cargo fork structure by driving lead screw 11;

[0042] Extension plate 13: long strip plate, one end connected to limiting plate 10, the other end connected to sliding block plate 14, inserted into the C-shaped groove 15 of the cargo fork 3 and slidable, by adjusting its extension length, changing the effective length of the cargo fork 3, to adapt to the loading requirements of goods of different sizes;

[0043] Slider plate 14: plate-shaped, with a threaded hole in the middle, threaded with the screw rod 11, sliding on the screw rod 11 when the screw rod 11 rotates, driving the extension plate 13 to move;

[0044] C-shaped slot 15: C-shaped slot structure, opened at one end of the cargo fork 3, inserted into the extension plate 13, providing a sliding track for the extension plate 13, allowing the extension plate 13 to be adjusted in extension and retraction on the cargo fork 3;

[0045] Square hole 16: square hole structure, opened on the cargo fork 3, installing the magnetic block 17, providing a fixed position for the magnetic block 17;

[0046] Magnetic block 17: square block, matching the size of the square hole 16, magnetically connected with metal tray or metal shell goods, fixing the goods, preventing the goods from falling off during transportation.

[0047] Working principle: when the need to lift the load fork 3, the operator operation of the battery and hydraulic pump 6, which provides power for the hydraulic cylinder 8, the piston rod movement of the hydraulic cylinder 8, drive shaft, make the transmission sprocket 4 both ends of the transmission chain wheel 4 on the chain 5, because the transmission chain 5 one end with the load fork 3 fixed connection, the other end is fixed on the vertical beam frame 1 of the crossbar, so the transmission sprocket 4 rotation will drive the transmission chain 5 movement, in turn realize the load fork 3 along the vertical beam frame 1 up and down sliding, complete the lifting operation of goods, when the need for manual operation, can be through the drag lever and foot pedal on the hydraulic cylinder 8, realize the same load fork lifting effect, for different specifications of goods, can adjust the extension of the load fork structure, start the motor 12, the output shaft of the motor 12 drive screw 11 rotation, screw 11 and the sliding block plate 14 on the threaded hole screw connection, and the extension plate 13 and C-shaped groove 15 plug-in connection limit the rotation of the sliding block plate 14, therefore, the screw 11 rotation, the sliding block plate 14 on the screw 11 sliding, thereby driving the extension plate 13 in the C-shaped groove 15 of the load fork 3 sliding, by adjusting, can change the distance between the limit plate 10 and the load fork 3, make the upper surface of the limit plate 10 and the upper surface of the load fork 3 flush, to adapt to the loading requirements of different size goods, ensure the stability of the goods transportation, when transporting metal tray or metal shell goods, magnetic structure plays a role, the load fork 3 on the magnetic block 17 is installed in the square hole 16, when the goods placed on the load fork 3, the magnetic block 17 and metal tray or metal shell goods produce magnetic attraction connection, will be firmly fixed on the load fork 3, when not need to use the magnetic function, can be covered with the cover plate 9 in the square hole 16, cover the magnetic block 17, seal the square hole 16, in the whole loading and unloading process, the operator by pushing the walking fork 2, using the walking fork 2 and the vertical beam frame 1 bottom roller realize the movement of the forklift, cooperate with the lifting of the load fork 3, the extension of the load fork structure adjustment and the fixation of the goods by the magnetic structure, complete the heavy maintenance equipment from the ground to the transport vehicle compartment or from the compartment to the ground designated location of loading and unloading operation, in the loading and unloading operation, first push the forklift to the goods, according to the size of the goods adjust the extension of the load fork structure, if the goods is metal material, then open the cover plate 9 of the magnetic structure, then operate the hydraulic pump lifting button, the battery and hydraulic pump 6 drive the hydraulic cylinder 8, drive the transmission sprocket 4 and the transmission chain 5, make the load fork 3 lift the goods under the guidance of the guide wheel 7, then push the forklift, use the walking fork roller and the lower support universal wheel to move the walking fork 2 to the compartment appropriate position, then pull the walking fork 2 back, finally operate the hydraulic pump to make the load fork 3 rise to the same level with the compartment, push the walking fork 2 to the load fork 3, push the goods to the designated position of the compartment, during the vertical beam frame 1 plays a role in stable support, first push the forklift to the compartment goods unloading place, operate the hydraulic pump to make the load fork 3 rise to the fork loading position of the goods, the magnetic block 17 adsorb the goods, then operate the hydraulic pump to make the load fork 3 rise to fork the goods, then pull out the walking fork 2,The hydraulic pump is operated to make the oil cylinder elongate, the walking fork 2 falls to the ground, and then the fork truck is pushed to move backward. Finally, the hydraulic pump is operated to make the loading fork 3 descend, the goods are unloaded to the designated position on the ground, the cover plate 9 of the magnetic attraction structure is covered after the unloading is completed, and if the loading fork structure is adjusted to be elongated, the initial state is restored. During the whole loading and unloading process, the structures work cooperatively to ensure the smooth operation.

[0048] Although the embodiments of the present application have been shown and described, it should be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A heavy load hydraulic chain drive truck-mounted fork device, comprising a vertical beam frame (1), a walking fork (2) and a load fork (3), the bottom of the vertical beam frame (1) is connected with the walking fork (2) through plug-in connection, one end of the load fork (3) is fixedly connected with a guide wheel (7), the side surface of the vertical beam frame (1) is slidably connected with the load fork (3), the load fork (3) is slidably connected with the vertical beam frame (1) through the guide wheel (7), and the load fork (3) is in parallel with the walking fork (2), characterized in that: The vertical beam frame (1) is provided with a transmission assembly, the transmission assembly is connected with the cargo fork (3), the cargo fork (3) is provided with an extension cargo fork structure, and the cargo fork (3) is provided with a plurality of magnetic attraction structures. ​ 2. A heavy duty hydraulic chain drive on-board fork lift device according to claim 1, characterized in that: The transmission assembly comprises a transmission sprocket (4), a transmission chain (5), a battery and a hydraulic pump (6) and a hydraulic oil cylinder (8), the bottom surface in the vertical beam frame (1) is fixedly provided with the battery and the hydraulic pump (6), the battery and the hydraulic pump (6) are provided with a pull rod and a foot pedal, the bottom surface in the vertical beam frame (1) is provided with the hydraulic oil cylinder (8), the bottom surface of the main body of the hydraulic oil cylinder (8) is fixedly connected with the vertical beam frame (1), the hydraulic oil cylinder (8) and the battery and the hydraulic pump (6) are connected by wires, one end of the piston rod of the hydraulic oil cylinder (8) is fixedly connected with a rotating shaft, one side of the cylindrical surface of the rotating shaft is fixedly connected with the hydraulic oil cylinder (8), both ends of the rotating shaft are rotatably connected with the transmission sprocket (4), the sprocket teeth of the transmission sprocket (4) are connected with the transmission chain (5) in a clamping mode, one side of the transmission chain (5) is fixedly connected with the cargo fork (3), and the other end of the transmission chain (5) is fixedly connected with the cross rod of the vertical beam frame (1).

3. A heavy duty hydraulic chain drive on-board fork lift device according to claim 2, wherein: The extension cargo fork structure comprises a limiting plate (10), an extension plate (13), a sliding block plate (14) and a C-shaped groove (15), one end of the extension plate (13) is fixedly connected with the limiting plate (10), and the other end of the extension plate (13) is fixedly connected with the sliding block plate (14); one end of the cargo fork (3) away from the vertical beam frame (1) is provided with the C-shaped groove (15), the C-shaped groove (15) is close to the top surface of the cargo fork (3), the extension plate (13) is insertedly connected in the C-shaped groove (15), and the extension plate (13) is slidably connected with the C-shaped groove (15); the sliding block plate (14) is arranged in the cargo fork (3), and the limiting plate (10) is arranged outside the cargo fork (3).

4. A heavy duty hydraulic chain drive on-board fork lift device according to claim 3, wherein: The extension cargo fork structure further comprises a lead screw (11) and a motor (12), one side of the sliding block plate (14) opposite to the limiting plate (10) is provided with a threaded hole, the inner wall of the cargo fork (3) connected with the vertical beam frame (1) is fixedly connected with the motor (12), the main body of the motor (12) is fixedly connected with the cargo fork (3), the output shaft of the extension plate (13) is fixedly connected with the lead screw (11) through a shaft coupling, the other end of the lead screw (11) is rotatably connected with the inner wall of the cargo fork (3) provided with the C-shaped groove (15), and the lead screw (11) is threadedly connected with the threaded hole of the sliding block plate (14).

5. A heavy duty hydraulic chain drive on-board fork lift device according to claim 4 wherein: The magnetic attraction structure comprises a square hole (16) and a magnetic attraction block (17), one side of the cargo fork (3) away from the extension plate (13) is provided with the square hole (16), and the magnetic attraction block (17) is insertedly connected in the square hole (16); the four sides of the magnetic attraction block (17) are fixedly connected with the square hole (16).

6. A heavy duty hydraulic chain drive on-board fork lift device according to claim 5 wherein: The magnetic attraction structure further comprises a cover plate (9), the square hole (16) is connected with the cover plate (9) through clamping connection, the cover plate (9) is on the side of the magnetic attraction block (17) away from the extension plate (13), and the cover plate (9) is attached to the magnetic attraction block (17).

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