A toothed lifting telescopic fork

Abstract

The utility model discloses a tooth type lift telescopic fork, including telescopic fork subassembly and lift platform subassembly, and telescopic fork subassembly is by upper fork, middle fork, lower fork and is connected in turn, and the synchronous telescopic of middle fork and upper fork is realized through the tensioning linkage mechanism, and lower fork installs drive mechanism and vertical rack, provides power for telescopic and participates in lifting drive, and lift platform subassembly contains base, guide shoe mechanism and lift drive mechanism, and the combination wheel groove of guide shoe mechanism cooperates with combination guide wheel, realizes lift accurate orientation, and lift drive mechanism is engaged through transmission shaft, gear and lower fork rack, and the vertical lift of telescopic fork subassembly is converted to the rotation movement of motor. The utility model discloses through gear rack drive and precision orientation structure, has improved equipment operation stability, transmission efficiency and positioning accuracy, has effectively guaranteed the safety of goods handling, is applicable to the scene of high requirements of handling accuracy and efficiency such as automatic warehousing.

Description

Technical Field

[0001] This utility model relates to the field of telescopic fork manufacturing technology, specifically to a toothed lifting telescopic fork. Background Technology

[0002] In material handling scenarios across warehousing, logistics, and manufacturing industries, lifting forks are crucial equipment for efficient transfer of raw materials and finished products, playing a vital role, especially in assembly line settings where rapid and accurate material delivery is required. Currently, in light-load applications, some traditional lifting forks employ multi-stage linkages or hydraulic drive structures, resulting in numerous components, complex assembly processes, high manufacturing costs, and difficult maintenance. While the load is relatively small in light-load scenarios, material placement may deviate from the intended path. Traditional forks' single-rail guides or simple gear transmission structures are prone to operational jamming or component wear due to uneven loading, affecting equipment lifespan and safety. Furthermore, the dispersed drive mechanism and fork body layout of some forks result in a loose overall structure, making them unsuitable for space-constrained light-load operating environments. Simultaneously, traditional electrical control schemes lack sufficient accuracy in detecting fork position, potentially leading to positioning errors during loading and unloading, impacting operational efficiency.

[0003] Therefore, how to overcome the shortcomings of the existing technology mentioned above has become the subject of this application. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a toothed lifting telescopic fork.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A toothed telescopic lifting fork includes a telescopic fork assembly and a lifting platform assembly. The telescopic fork assembly is mounted on the lifting platform assembly. The telescopic fork assembly includes an upper fork, a middle fork, and a lower fork that are sequentially and movably connected. The middle fork and the upper fork are synchronously extended and retracted through a tensioning linkage mechanism. A drive mechanism that works in conjunction with the lower fork is mounted on the lower fork. A vertical rack is provided on the lower fork.

[0007] The lifting platform assembly includes a base and a guide shoe mechanism and a lifting drive mechanism mounted on the base. The guide shoe mechanism consists of a combined wheel groove, a combined guide wheel, and a fixing plate. The combined wheel groove is mounted on the base and has a guide groove in the vertical direction. The combined guide wheel is mounted below the lower fork through the fixing plate and is embedded in the guide groove of the combined wheel groove. The lifting drive mechanism includes a drive shaft, a gear, and a bearing seat. Both ends of the drive shaft are mounted on the base through the bearing seats. The drive shaft is connected to a lifting motor through a coupling. The gear is keyed to the drive shaft. When the lifting motor drives the drive shaft to rotate, the gear meshes with the vertical rack.

[0008] Furthermore, the upper fork and the middle fork are slidably connected by a first sliding structure. The first sliding structure includes a first guide member and a first sliding groove. One of the first guide member and the first sliding groove is disposed on the upper fork, and the other is disposed on the middle fork. The sliding engagement of the upper fork and the middle fork is achieved by the first guide member sliding on the first sliding groove. The middle fork and the lower fork are slidably connected by a second sliding structure. The second sliding structure includes a second guide member and a second sliding groove. One of the second guide member and the second sliding groove is disposed on the middle fork, and the other is disposed on the lower fork. The sliding engagement of the middle fork and the lower fork is achieved by the second guide member sliding on the second sliding groove.

[0009] Furthermore, the first guide member includes a first guide block and a first guide wheel, both of which are slidably connected to the first groove; the second guide member includes a second guide block and a second guide wheel, both of which are slidably connected to the second groove.

[0010] Furthermore, the drive mechanism includes a telescopic fork motor, a universal joint, and a position switch. The telescopic fork motor is connected to the lower fork gear on the lower fork via the universal joint, and the position switch is electrically connected to the telescopic fork motor and the lifting motor.

[0011] Furthermore, a rack is installed in the fork, and the rack meshes with the lower fork gear. When the lower fork gear rotates, it drives the rack.

[0012] Furthermore, the tensioning linkage mechanism includes a tensioner and a plate chain. The tensioner is installed on both the upper fork and the lower fork. The plate chain bypasses the sprocket on the middle fork, with one end connected to the tensioner on the upper fork and the other end connected to the tensioner on the lower fork.

[0013] Furthermore, clamping plates are installed on both sides of the lower fork gear.

[0014] Furthermore, the drive mechanism is covered with a protective cover.

[0015] Furthermore, the position switch includes a telescopic fork position switch and a lifting position switch.

[0016] Compared with existing technologies, the advantages of this utility model are as follows: It adopts a composite transmission structure of gear-rack and chain tensioner, integrating the drive mechanism for horizontal extension and vertical lifting into the lower fork assembly and the lifting platform assembly, avoiding the redundant layout of traditional multi-stage linkage or hydraulic systems. Through mechanical structure innovation and electromechanical control synergistic optimization, it breaks through the technical bottlenecks of traditional light-load forks in terms of structural compactness, off-center load adaptability and energy consumption control. It has the advantages of high efficiency, safety and economy, and can significantly improve the material handling efficiency in warehousing logistics, assembly lines and other scenarios, and has broad industrial application value. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Appendix Figure 1 This is a schematic diagram of the structure of an embodiment of this application;

[0019] Appendix Figure 2 This is a schematic diagram of the telescopic fork assembly according to an embodiment of this application;

[0020] Appendix Figure 3 This is a schematic diagram of the structure of the fork in an embodiment of this application;

[0021] Appendix Figure 4 This is a schematic diagram of the fork structure in an embodiment of this application;

[0022] Appendix Figure 5 This is a partial enlarged view of the fork in the embodiment of this application;

[0023] Appendix Figure 6 This is a schematic diagram of the structure of the fork in an embodiment of this application;

[0024] Appendix Figure 7 This is a schematic diagram of the lifting platform assembly according to an embodiment of this application;

[0025] Appendix Figure 8 This is a schematic diagram of the guide shoe mechanism according to an embodiment of this application;

[0026] Appendix Figure 9 This is a schematic diagram of the lifting drive mechanism in an embodiment of this application.

[0027] Explanation of reference numerals and components in the accompanying drawings:

[0028] 10. Telescopic fork assembly; 11. Upper fork; 112. First guide block; 113. First guide wheel; 12. Middle fork; 121. Middle fork rack; 122. First slide groove; 123. Second slide groove; 124. Flywheel; 13. Lower fork; 131. Vertical rack; 132. Second guide block; 133. Second guide wheel; 134. First lower fork gear; 135. Second lower fork gear; 20. Lifting platform assembly; 21. Base; 22. Guide shoe mechanism; 221. Combined wheel groove; 222. Combined guide wheel; 223. Fixing plate; 23. Lifting drive mechanism; 231. Drive shaft; 232. Gear; 233. Bearing seat; 30. Lifting motor; 31. Telescopic fork motor; 32. Universal joint; 33. Position switch; 14. Tensioner; 15. Clamping plate; 16. Protective cover. Detailed Implementation

[0029] The technical solution of this utility model will now be clearly and completely described through specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0030] See appendix Figures 1-9 As shown, this application discloses a toothed telescopic lifting fork that, through the coordinated design of mechanical transmission and a guiding mechanism, achieves horizontal telescopic and vertical lifting functions for goods. It is suitable for light-load material handling scenarios. Its core consists of a telescopic fork assembly 10 and a lifting platform assembly 20. The telescopic fork assembly 10 includes an upper fork 11, a middle fork 12, and a lower fork 13 connected sequentially. The middle fork 12 and the upper fork 11 achieve synchronous telescopic movement through a tensioning linkage mechanism. This mechanism ensures that the middle fork 12 and the upper fork 11 maintain synchronized movement during telescopic movement, avoiding problems such as goods tilting or falling due to asynchronous telescopic movement, thus improving the stability and safety of goods handling. A drive mechanism is installed on the lower fork 13 to power the telescopic movement of the telescopic fork assembly 10. By precisely controlling the power output, smooth telescopic fork telescopic movement is achieved. A vertical rack 131 is provided on the lower fork 13, meshing with a gear in the lifting platform assembly 20, thereby converting the rotational motion of the lifting drive mechanism into the vertical lifting motion of the telescopic fork assembly 10.

[0031] The lifting platform assembly 20 includes a base 21 and a guide shoe mechanism 22 and a lifting drive mechanism 23 mounted on the base 21. The base 21 is the basic support component of the lifting platform assembly 20. Preferably, the base 21 is made of a high-strength metal frame and is fixed to the ground or equipment base by anchor bolts, providing a rigid mounting reference for the guide shoe mechanism 22 and the lifting drive mechanism 23. The guide shoe mechanism 22 consists of a combined wheel groove 221, a combined guide wheel 222, and a fixing plate 223. The combined wheel groove 221 is mounted on the base 21 and has a guide groove in the vertical direction. The combined guide wheel 222 is mounted below the lower fork 13 through the fixing plate 223 and is embedded in the guide groove of the combined wheel groove 221. When the lifting drive mechanism 23 drives the lower fork 13 to move vertically, the combined guide wheel 222 rolls in the guide groove, constraining the lateral displacement of the lower fork 13 and allowing it to move only in the vertical direction, thereby achieving precise guidance. The lifting drive mechanism 23 includes a drive shaft 231, a gear 232, and a bearing housing 233. Both ends of the drive shaft 231 are mounted on the base 21 via the bearing housings 233, which provide support and reduce rotational resistance. The drive shaft 231 is connected to the lifting motor 30 via a coupling, and the gear 232 is keyed to the drive shaft 231. The lifting motor 30 acts as a power source, transmitting its rotational motion to the drive shaft 231. When the lifting motor 30 drives the drive shaft 231 to rotate, the gear 232 meshes with the vertical rack 131. Since the vertical rack 131 is fixed to the lower fork 13, it forms a rack and pinion transmission pair with the gear 232. When the lifting motor 30 drives the drive shaft 231 to rotate, the gear 232 rotates accordingly, and its teeth mesh with the tooth grooves of the vertical rack 131, converting the rotational motion of the gear 232 into the vertical linear motion of the vertical rack 131.

[0032] The upper fork 11 and the middle fork 12 are slidably connected by a first sliding structure. The first sliding structure includes a first guide member and a first sliding groove 122. One of the first guide member and the first sliding groove 122 is located on the upper fork 11, and the other is located on the middle fork 12. The sliding engagement between the upper fork 11 and the middle fork 12 is achieved by the first guide member sliding on the first sliding groove 122. The middle fork 12 and the lower fork 13 are slidably connected by a second sliding structure. The second sliding structure includes a second guide member and a second sliding groove 123. One of the second guide member and the second sliding groove 123 is located on the middle fork 12, and the other is located on the lower fork 13. The sliding engagement between the middle fork 12 and the lower fork 13 is achieved by the second guide member sliding on the second sliding groove 123. Preferably, the first guide member includes a first guide block 112 and a first guide wheel 113 disposed on the inner wall of the upper fork 11, and the first sliding groove 122 is formed on the outer wall of the middle fork 12. Both the first guide block 112 and the first guide wheel 113 are slidably connected to the first sliding groove 122. The second guide member includes a second guide block 132 and a second guide wheel 133 disposed on the outer wall of the lower fork 13, and a second slide groove 123 is formed on the inner wall of the middle fork 12. The second guide block 132 and the second guide wheel 133 are slidably connected to the second slide groove 123.

[0033] The drive mechanism includes a telescopic fork motor 31, a universal joint 32, and a position switch 33. The telescopic fork motor 31 is connected to the first lower fork gear 134 and the second lower fork gear 135 on the lower fork 13 via the universal joint 32. The position switch 33 is electrically connected to the telescopic fork motor 31 and the lifting motor 30. Preferably, a double-section universal joint is used, with a cross-shaft coupling in the middle, allowing for angular deviation and axial displacement between the two shafts. When the telescopic fork assembly 10 tilts slightly during lifting, the universal joint 32 can compensate for the angular deviation through the swing of its joint, ensuring continuous and stable power transmission and avoiding jamming or wear caused by misalignment of traditional rigid couplings. The first lower fork gear 134 is keyed to the output end of the universal joint 32, and the second lower fork gear 135 is coaxially fixed to the first lower fork gear 134, achieving power splitting through an idler gear structure.

[0034] The center fork 12 is equipped with a center fork rack 121. The center fork rack 121 meshes with the first lower fork gear 134 and the second lower fork gear 135. When the gears rotate clockwise or counterclockwise, the center fork rack 121 will be pushed or pulled by the inter-tooth force. The center fork rack 121 is fixed on the center fork 12, and its horizontal movement directly drives the center fork 121 to extend or retract synchronously, realizing the telescopic function.

[0035] The tensioning linkage mechanism includes a tensioner 14 and a plate chain. Tensioners 14 are installed on both the upper fork 11 and the lower fork 13. The plate chain passes over a sprocket 124 on the middle fork 12, with one end connected to the tensioner 14 on the upper fork 11 and the other end connected to the tensioner 14 on the lower fork 13. Utilizing the flexible transmission characteristics of the plate chain, the tensioners 14 fix both ends of the chain, converting the movement of the middle fork 12 into synchronous movement of the upper fork 11, thus achieving double-fork linkage. The tensioner 14 prevents transmission failure caused by chain slack due to long-term use, while compensating for length changes caused by chain wear, ensuring linkage accuracy. Plate chain drives feature a constant transmission ratio, compact structure, and wear resistance, making them suitable for mechanical structures requiring synchronous movement. The sprocket 124 acts as a guide mechanism, changing the direction of chain movement so that the linear motion of the middle fork 12 is transmitted to the upper fork 11 via the chain. When the middle fork 12 extends, it drives the sprocket 124 forward, pulling the chain. Since the other end of the chain is fixed to the lower fork 13, the upper fork 11 is pulled by the chain and extends synchronously (when the chain is taut, the displacement of the middle fork and the upper fork is the same). When the middle fork 12 retracts, it drives the sprocket 124 backward, the slack section of the chain is tightened by the tensioner, and the upper fork 11 is pulled by the chain and retracts synchronously, always maintaining synchronous movement with the middle fork 12.

[0036] Preferably, clamping plates 15 are installed on both sides of the first lower fork gear 134 and the second lower fork gear 135. The clamping plates 15 are fixed to both sides of the first lower fork gear 134 and the second lower fork gear 135 by bolts or welding, forming an axial constraint on the gears and preventing the gears from moving axially.

[0037] Preferably, the drive mechanism is equipped with a protective cover 16 to form a physical isolation barrier, preventing operators from accidentally touching the moving parts, avoiding mechanical injury accidents such as entanglement and crushing, and ensuring personnel safety.

[0038] Preferably, the position switch 33 includes a telescopic fork position switch and a lifting position switch. The telescopic fork position switch is mainly used to monitor the telescopic positions of the upper fork 11 and the middle fork 12. When the telescopic fork motor 31 drives the fork to extend or retract, the telescopic fork position switch detects the movement status of the fork in real time. The lifting position switch is responsible for monitoring the vertical lifting height of the telescopic fork assembly 10. During the lifting process of the lifting motor 30 driving the telescopic fork assembly 10 to lift, the lifting position switch works continuously. The telescopic fork position switch and the lifting position switch work closely with the control system to work together in the picking and placing process. When picking up goods, the telescopic fork position switch first confirms that the fork has extended to the correct position, and then the lifting position switch controls the fork to rise and lift the goods; when placing goods, after the lifting position switch controls the fork to reach the target height, the telescopic fork position switch controls the fork to extend and place the goods. The entire process ensures safe, efficient, and accurate execution of the operation process through the precise detection and feedback of the two types of position switches.

[0039] The bidirectional telescopic function is achieved as follows: The telescopic fork motor 31 serves as the power source, outputting rotational power upon startup. This power is transmitted through the universal joint 32 to the first lower fork gear 134 and the second lower fork gear 135, driving the gears to rotate. This utilizes the principle of gear transmission in mechanical transmission, transferring the motor's rotational motion to the gears of the lower fork assembly, providing initial power for the subsequent extension and retraction of the fork. The first lower fork gear 134 and the second lower fork gear 135 mesh with the rack 121 fixed on the center fork 12. According to the gear and rack transmission principle, when the first lower fork gear 134 and the second lower fork gear 135 rotate, they push the rack 121 to perform horizontal linear motion, thereby causing the center fork 12 to extend or retract. This transmission method can accurately convert the rotational motion of the gears into linear motion, realizing the extension and retraction of the center fork. The tensioner 14 is fixed at both ends to the upper fork 11 and the lower fork 13, respectively, and a plate chain is connected by passing around the sprocket 124 of the center fork 12. When the fork 12 extends and retracts under the drive of the gear and rack, it drives the plate chain. Since the two ends of the chain are connected to the upper fork 11 and the lower fork 13 respectively, and the tensioner 14 keeps the chain taut, the movement of the chain can pull the upper fork 11 to extend or retract synchronously. This process utilizes the characteristics of chain drive and tensioning device to ensure that the upper fork 11 and the middle fork 12 remain synchronized during the extension and retraction process, preventing goods from tilting or falling due to asynchronous extension and retraction of the forks. During the entire bidirectional extension and retraction process, the telescopic fork motor 31 provides power, which drives the middle fork 12 to move through the gear and rack drive. Then, the tensioner 14 and the plate chain realize the synchronous extension and retraction of the upper fork 11 and the middle fork 12. The components work closely together to convert the rotational motion of the telescopic fork motor 31 into gear rotation, linear motion of the middle fork 12, and synchronous linear motion of the upper fork 11 in sequence, ultimately realizing the bidirectional extension and retraction function of the telescopic fork assembly 10 and meeting the horizontal displacement requirements when storing and retrieving goods.

[0040] The lifting function is achieved as follows: The lifting motor 30 serves as the power source. After starting in the forward direction, it outputs rotational power, which is transmitted to the transmission shaft 231 through the coupling, causing the transmission shaft 231 to rotate. Since the gear 232 is fixed to the transmission shaft 231 by a key, the two form a rigid connection. Therefore, the rotation of the transmission shaft 231 will synchronously drive the gear 232 to rotate. The gear 232 meshes with the rack 131 fixed on the lower fork 13. According to the gear and rack transmission principle, the rotational motion of the gear 232 will be converted into the linear motion of the rack 131. When the gear 232 rotates clockwise, it will push the rack 131 to move upward, thereby driving the lower fork 13 connected to the rack 131 and the entire telescopic fork assembly 10 to rise vertically. When the motor reverses, the gear 232 rotates counterclockwise, and the rack 131 moves downward, realizing the vertical descent of the telescopic fork assembly 10. The combined guide wheel 222 is fixedly installed below the lower fork 13 via the fixing plate 223, while the combined wheel groove 221 is fixed to the base 21 of the lifting platform assembly 20. The combined guide wheel 222 is embedded in the guide groove of the combined wheel groove 221, constraining the movement direction of the lower fork 13. This ensures that the lower fork 13 can only move vertically along the guide groove of the combined wheel groove 221 during lifting, effectively limiting its horizontal offset and sway. Even with a certain lateral force during the gear and rack transmission, the cooperation between the combined guide wheel 222 and the combined wheel groove 221 ensures the smoothness and accuracy of the lifting of the telescopic fork assembly 10, avoiding the risk of jamming or cargo falling due to movement deviation. By controlling the forward and reverse rotation and speed of the lifting motor 30, the lifting direction and speed of the telescopic fork assembly 10 can be precisely controlled. When the fork needs to be raised to a specified height, the motor is started to rotate forward, and the gear and rack transmission drives the fork to rise. When approaching the target height, the motor speed can be reduced to achieve precise positioning. Conversely, to lower the forks, the motor is reversed to ensure a smooth descent. This combination of motor control and mechanical transmission enables efficient and safe lifting and lowering of goods, meeting the needs of automated warehousing and other similar scenarios.

[0041] Pick-up and delivery process:

[0042] The picking process works as follows: The telescopic fork position switch and the lifting position switch monitor the position information of the telescopic fork assembly 10 and the cargo location in real time. When the telescopic fork moves to the coordinates corresponding to the picking location, the switch triggers a signal, which is fed back to the control system to confirm that the current position meets the picking conditions. After receiving the picking instruction, the control system starts the telescopic fork motor 31, which drives the upper fork 11 to extend through the transmission component. During this process, the tensioning linkage mechanism ensures that the upper fork 11 and the middle fork 12 extend synchronously, keeping the fork body stable and preparing to lift the goods. After the telescopic fork is fully extended, the lifting motor 30 starts, driving the telescopic fork assembly 10 to rise vertically through the gear and rack transmission. As the fork body rises, the goods are lifted smoothly. When the predetermined height is reached, the lifting motor 30 stops. After the goods are lifted, the telescopic fork motor 31 starts again, driving the upper fork 11 to retract, safely returning the goods to the telescopic fork assembly 10. The picking action is thus completed.

[0043] The loading / unloading process works as follows: Based on the target cargo location information, the control system activates the lifting motor 30, driving the telescopic fork assembly 10 to rise or fall precisely to the target cargo location height. The telescopic fork position switch and the lifting position switch continuously monitor the position to ensure accurate positioning. Upon reaching the target height, the telescopic fork motor 31 activates, extending the upper fork 11 to deliver the goods to the corresponding position above the cargo location. Once the upper fork 11 is fully extended, the lifting motor 30 activates, driving the telescopic fork assembly 10 to fall until the upper fork 11 is below the cargo location plane, and the goods are smoothly placed on the cargo location. After the goods are placed, the lifting motor 30 drives the telescopic fork assembly 10 to rise to a safe height, and then the telescopic fork motor 31 drives the upper fork 11 to retract, completing the loading / unloading process. The telescopic fork assembly 10 returns to its initial state, awaiting the next instruction.

[0044] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A toothed lifting telescopic fork, characterized in that, The device includes a telescopic fork assembly and a lifting platform assembly. The telescopic fork assembly is mounted on the lifting platform assembly. The telescopic fork assembly includes an upper fork, a middle fork, and a lower fork that are movably connected in sequence. The middle fork and the upper fork are synchronously telescopic through a tensioning linkage mechanism. The lower fork is equipped with a drive mechanism that works in conjunction with it. A vertical rack is provided on the lower fork. The lifting platform assembly includes a base and a guide shoe mechanism and a lifting drive mechanism mounted on the base. The guide shoe mechanism consists of a combined wheel groove, a combined guide wheel, and a fixing plate. The combined wheel groove is mounted on the base and has a guide groove in the vertical direction. The combined guide wheel is mounted below the lower fork through the fixing plate and is embedded in the guide groove of the combined wheel groove. The lifting drive mechanism includes a drive shaft, a gear, and a bearing seat. Both ends of the drive shaft are mounted on the base through the bearing seats. The drive shaft is connected to a lifting motor through a coupling. The gear is keyed to the drive shaft. When the lifting motor drives the drive shaft to rotate, the gear meshes with the vertical rack.

2. The toothed lifting telescopic fork according to claim 1, characterized in that, The upper fork and the middle fork are slidably connected by a first sliding structure. The first sliding structure includes a first guide and a first groove. One of the first guide and the first groove is disposed on the upper fork, and the other is disposed on the middle fork. The sliding engagement of the upper fork and the middle fork is achieved by the first guide sliding on the first groove. The middle fork and the lower fork are slidably connected by a second sliding structure. The second sliding structure includes a second guide and a second groove. One of the second guide and the second groove is disposed on the middle fork, and the other is disposed on the lower fork. The sliding engagement of the middle fork and the lower fork is achieved by the second guide sliding on the second groove.

3. A toothed lifting telescopic fork according to claim 2, characterized in that, The first guide member includes a first guide block and a first guide wheel, both of which are slidably connected to the first groove; the second guide member includes a second guide block and a second guide wheel, both of which are slidably connected to the second groove.

4. A toothed lifting telescopic fork according to claim 1, characterized in that, The drive mechanism includes a telescopic fork motor, a universal joint, and a position switch. The telescopic fork motor is connected to the lower fork gear on the lower fork via the universal joint, and the position switch is electrically connected to the telescopic fork motor and the lifting motor.

5. A toothed lifting telescopic fork according to claim 4, characterized in that, The middle fork is equipped with a middle fork rack, which meshes with the lower fork gear. When the lower fork gear rotates, it drives the middle fork rack.

6. A toothed lifting telescopic fork according to claim 1, characterized in that, The tensioning linkage mechanism includes a tensioner and a plate chain. The tensioner is installed on both the upper fork and the lower fork. The plate chain passes around the sprocket on the middle fork, with one end connected to the tensioner on the upper fork and the other end connected to the tensioner on the lower fork.

7. A toothed lifting telescopic fork according to claim 4, characterized in that, Clamping plates are installed on both sides of the lower fork gear.

8. A toothed lifting telescopic fork according to claim 4, characterized in that, The drive mechanism is covered with a protective cover.

9. A toothed lifting telescopic fork according to claim 4, characterized in that, The position switches include a telescopic fork position switch and a lifting position switch.

Images