Heavy-load telescopic fork with narrow section

Abstract

The invention relates to the technical field of telescopic forks and discloses a narrow-section heavy-load telescopic fork which comprises a telescopic fork fixing arm and a first-stage telescopic fork arm arranged on the telescopic fork fixing arm, and a second-stage telescopic fork arm is arranged on the first-stage telescopic fork arm. The telescopic fork fixing arm is provided with a driving structure used for driving the first-stage telescopic fork arm and the second-stage telescopic fork arm, two mounting plates are symmetrically and fixedly mounted on the bottom face of the telescopic fork fixing arm, first spring telescopic rods are arranged at the two ends of the top face of each mounting plate in a penetrating mode, and the first spring telescopic rods are fixedly connected with the penetrating positions. Through the anti-falling assembly, the connecting hook assembly and the steel cable inclined lifting structure, when the two-stage telescopic fork arm stretches out and bears heavy loads, stable inclined upward pulling force can be applied to the front end of the fork arm, the bending falling amount of the cantilever caused by the heavy loads is reduced, the rigidity and bearing stability of the fork arm are improved, the goods inclination and sliding risks are effectively avoided, and the safety of goods is improved. And the safety and the reliability in the heavy load carrying process are improved.

Description

Technical Field

[0001] This invention relates to the field of telescopic fork technology, and more particularly to heavy-duty telescopic forks with narrow cross-sections. Background Technology

[0002] Telescopic forks are the core actuators for automated warehousing and logistics handling. They achieve adjustable linear reciprocating motion through multi-level nested booms, enabling precise storage, retrieval, and transfer of goods on stacker cranes, AGVs, and shuttles.

[0003] In actual heavy-duty operations, when telescopic forks extend to carry heavy loads, the telescopic fork arms that directly bear the load are subjected to a large downward bending moment. The greater the extension stroke, the more pronounced the stress on the cantilever becomes. The middle and front parts of the fork arms are prone to bending and sagging due to the weight of the load. This deformation not only causes the telescopic fork's running trajectory to deviate and its positioning accuracy to decrease, but also exacerbates the uneven wear of the transmission components and guide structures. Long-term use can easily lead to problems such as telescopic jamming and unstable movement. In severe cases, it can cause the load to tilt, slip, or even damage the equipment, directly affecting the stability, reliability, and safety of telescopic fork operations.

[0004] Therefore, it is necessary to design a heavy-duty telescopic fork with a narrow cross-section to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a narrow-section heavy-duty telescopic fork.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A narrow-section heavy-duty telescopic fork includes a telescopic fork fixed arm and a primary telescopic fork arm mounted on the fixed arm. A secondary telescopic fork arm is mounted on the primary telescopic fork arm. The fixed arm has a drive structure for driving the primary and secondary telescopic fork arms. Two mounting plates are symmetrically fixedly mounted on the bottom surface of the fixed arm. A spring telescopic rod is passed through both ends of the top surface of each mounting plate and fixedly connected to the through-hole. A mounting shell is fixedly mounted on the telescopic end of the spring telescopic rod. A steel cable is mounted inside the mounting shell, and a hook is fixedly mounted on the pulling end of the steel cable. A fall arrestor adapted to the steel cable is mounted on the top surface of the mounting plate. Two sliding rods adapted to the hooks are symmetrically arranged on both sides of the secondary telescopic fork arm. A hook assembly for mounting the sliding rods is provided on the side of the secondary telescopic fork arm. Locking assemblies for locking the fall arrestor are provided at both ends of the mounting plate. Limiting assemblies for controlling the fall arrestor's movement are provided at both ends of the mounting plate.

[0008] As a preferred embodiment of the present invention, the fall arrestor includes a reel rotatably mounted on the inner wall of the mounting housing, the steel cable being evenly wound around the inner side of the reel, a drive shaft being provided through the side of the mounting housing and coaxially and fixedly connected to the reel, a torsion spring being fitted on the outer wall of the drive shaft, and the two ends of the torsion spring being fixedly connected to the drive shaft and the mounting housing respectively.

[0009] As a preferred embodiment of the present invention, the position where the steel cable passes through the mounting shell is located at the very top of the mounting shell.

[0010] As a preferred embodiment of the present invention, the hook assembly includes a mounting groove formed on the side end of the secondary telescopic fork arm, the slide rod is slidably mounted on the inner wall of the mounting groove, the outer wall of the slide rod is provided with a slot, two retaining rings that engage with the slot are symmetrically fixedly mounted on the inner wall of the mounting groove, a magnetic sheet is fixedly mounted on one end of the slide rod located outside the mounting groove, a mounting bracket is fixedly mounted on the side of the mounting plate, and a magnetic sheet is fixedly mounted on the top of the mounting bracket.

[0011] As a preferred embodiment of the present invention, the magnetic pole of the second magnetic piece is opposite to that of one of the two magnetic pieces located on the same side that is far from the first-stage telescopic fork arm, and is the same as that of the other magnetic piece.

[0012] As a preferred embodiment of the present invention, the locking assembly includes a support frame fixedly installed at the telescopic end of a spring telescopic rod. A fixed ring plate coaxially arranged with the drive shaft is fixedly installed on the top surface of the support frame. A fixed sleeve is fixedly installed on the side of the fixed ring plate. A plurality of locking plates arranged in a circular array are provided through the outer wall of the fixed sleeve. A plurality of locking grooves adapted to the locking plates are opened on the outer wall of the drive shaft. A plurality of fixed plates opposite to the locking plates are fixedly installed on the side of the fixed ring plate. A spring is fixedly installed between the side of the fixed plate and the side of the locking plate. A sensing structure adapted to the locking assembly is provided at the end of the support frame away from the spring telescopic rod.

[0013] As a preferred embodiment of the present invention, the sensing structure includes a transmission gear rotatably mounted on the end of the support frame and coaxially arranged with the transmission shaft. A connecting rod is fixedly mounted on the side of the transmission gear. The outer wall of the connecting rod has a plurality of slots corresponding to the locking plate. A second magnetic plate is slidably mounted on the inner wall of the slot. A first magnetic plate corresponding to the second magnetic plate is fixedly mounted on one end of the locking plate located outside the locking slot. A drive motor is fixedly mounted on the end of the support frame. A drive gear meshing with the transmission gear is fixedly mounted on the output end of the drive motor.

[0014] As a preferred embodiment of the present invention, the magnetic poles of magnetic plate one and magnetic plate two are the same.

[0015] As a preferred embodiment of the present invention, the limiting component includes a fixed frame fixedly installed on the top surface of the mounting plate. Two partitions are symmetrically fixedly installed on the inner wall of the fixed frame. A limiting plate is slidably installed on the inner wall of the fixed frame opposite to the first spring telescopic rod. The telescopic end of the first spring telescopic rod has a limiting groove adapted to the limiting plate. A second spring is fixedly installed between the limiting plate and the partition. A sliding plate is slidably installed on the inner wall of the fixed frame away from the limiting plate. A third spring is fixedly installed between the side of the sliding plate and the inner wall of the fixed frame. A guide rod is fixedly installed on the side of the limiting plate opposite to the sliding plate. Two clearance openings adapted to the guide rods are symmetrically opened on the side of the sliding plate. A second spring telescopic rod is fixedly installed on the top surface of the sliding plate. The two second spring telescopic rods located at the same end of the two mounting plates are staggered. Two push plates located directly below the sliding rod and corresponding to the two second spring telescopic rods are symmetrically fixedly installed on the bottom surface of the secondary telescopic fork arm.

[0016] As a preferred embodiment of the present invention, the telescopic end of the second spring telescopic rod is symmetrically provided with two inclined surfaces, and the push plate is configured as L-shaped.

[0017] The present invention has the following beneficial effects:

[0018] 1. This heavy-duty telescopic fork uses anti-fall components, hook components and steel cable diagonal lifting structure to apply a stable diagonal upward pulling force to the front end of the fork arm when the secondary telescopic fork arm is extended and bearing heavy load. This reduces the bending and falling of the cantilever arm caused by heavy load, improves the rigidity and load-bearing stability of the fork arm, effectively avoids the risk of cargo tilting and slipping, and improves the safety and reliability of heavy-duty handling.

[0019] 2. In this invention, a magnetic attraction method with opposite and identical magnetic poles is used to realize the automatic extension and retraction of the slide bar. With the help of the limiting component, the slide bar and the hook are accurately hooked and autonomously unhooked. It can meet the bidirectional extension and retraction operation requirements of the telescopic fork. No additional drive or manual intervention is required throughout the process. The operation is smooth and without interference or jamming. The overall structure is compact and the response is fast, making it suitable for high-frequency operation scenarios in automated warehousing.

[0020] 3. In this invention, a centrifugal force-driven magnetic unlocking and spring reset locking structure is adopted, which can automatically release the reel lock to achieve unwinding when the fork arm is running. After positioning, the steel cable length is locked immediately. During reset, it works with the torsion spring to automatically rewind, realizing the linkage control of the entire process of unwinding, locking and rewinding. The positioning is accurate and the locking is reliable. At the same time, it extends the service life of the transmission components and improves the overall stability and service life of the equipment. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the narrow-section heavy-duty telescopic fork proposed in this invention; Figure 2This is a schematic diagram of the two-stage telescopic fork arm structure of the narrow-section heavy-duty telescopic fork proposed in this invention; Figure 3 for Figure 2 Enlarged structural diagram at point A in the middle; Figure 4 This is a schematic diagram of the mounting plate structure for the narrow-section heavy-duty telescopic fork proposed in this invention. Figure 5 This is an exploded structural diagram of the mounting shell of the narrow-section heavy-duty telescopic fork proposed in this invention. Figure 6 This is a schematic diagram of the mounting frame structure for the narrow-section heavy-duty telescopic fork proposed in this invention; Figure 7 for Figure 6 Enlarged structural diagram at point B; Figure 8 This is a schematic diagram of the limiting component structure of the narrow-section heavy-duty telescopic fork proposed in this invention.

[0022] In the picture: 1. Telescopic fork fixed arm; 2. Primary telescopic fork arm; 3. Secondary telescopic fork arm; 4. Drive structure; 5. Mounting plate; Fall arrestor components; 61. Spring telescopic rod one; 62. Mounting housing; 63. Reel; 64. Steel cable; 65. Hook; 66. Drive shaft; 67. Torsion spring; Hook assembly; 71. Mounting slot; 72. Slide bar; 73. Card slot; 74. Snap ring; 75. Magnetic plate one; 76. Mounting bracket; 77. Magnetic plate two; Locking assembly; 81. Support frame; 82. Fixing ring plate; 83. Fixing sleeve; 84. Locking plate; 85. Locking groove; 86. Fixing plate; 87. Spring 1; Induction structure; 91. Transmission gear; 92. Connecting rod; 93. Slot; 94. Magnet plate one; 95. Drive motor; 96. Drive gear; 97. Magnet plate two; 10. Limiting component; 101. Fixing frame; 102. Limiting plate; 103. Partition; 104. Limiting groove; 105. Spring 2; 106. Slide plate; 107. Spring 3; 108. Guide rod; 109. Clearance opening; 1010. Spring telescopic rod 2; 1011. Push plate. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0024] Example 1: This example shows a narrow-section heavy-duty telescopic fork disclosed in this embodiment, referring to... Figure 1-8The system includes a telescopic fork fixed arm 1 and a primary telescopic fork arm 2 mounted on the telescopic fork fixed arm 1. A secondary telescopic fork arm is mounted on the primary telescopic fork arm 2. A drive structure 4 for driving the primary telescopic fork arm 2 and the secondary telescopic fork arm 3 is mounted on the telescopic fork fixed arm 1. Two mounting plates 5 are symmetrically fixedly mounted on the bottom surface of the telescopic fork fixed arm 1. Spring telescopic rods 61 are passed through both ends of the top surface of the mounting plates 5, and the spring telescopic rods 61 are fixedly connected to the through ends. A mounting shell 62 is fixedly mounted on the telescopic end of the spring telescopic rods 61. A steel cable is provided on the inner side of the mounting shell 62. 64. The position where the steel cable 64 passes through the mounting shell 62 is located at the top of the mounting shell 62. The pulling end of the steel cable 64 is fixedly installed with a hook 65. The top surface of the mounting plate 5 is provided with a fall protection component 6 adapted to the steel cable 64. Two sliding rods 72 adapted to the hooks 65 are symmetrically arranged on both sides of the secondary telescopic fork arm 3. The side of the secondary telescopic fork arm 3 is provided with a hook assembly 7 for installing the sliding rods 72. Both ends of the mounting plate 5 are provided with locking components 8 for locking the fall protection component 6. Both ends of the mounting plate 5 are provided with limiting components 10 for controlling the clearance of the fall protection component 6.

[0025] The fall arrestor 6 includes a reel 63 rotatably mounted on the inner wall of the mounting housing 62, a steel cable 64 evenly wound on the inner side of the reel 63, a drive shaft 66 coaxially and fixedly connected to the reel 63 through the side of the mounting housing 62, a torsion spring 67 fitted on the outer wall of the drive shaft 66, and the two ends of the torsion spring 67 fixedly connected to the drive shaft 66 and the mounting housing 62 respectively.

[0026] The implementation principle of this embodiment is as follows:

[0027] In actual operation, the heavy-duty telescopic fork first securely mounts the fixed arm 1 of the telescopic fork to the corresponding equipment position via the mounting plates 5 on both sides. The drive structure 4 then drives the primary telescopic fork arm 2 and the secondary telescopic fork arm 3 to extend to both sides, thereby smoothly bearing heavy loads and completing the handling operation. During the outward extension of the primary telescopic fork arm 2 and the secondary telescopic fork arm 3, the sliding rod 72 on the side of the secondary telescopic fork arm 3 can form a reliable connection with the corresponding hook 65. With the coordinated action of the anti-fall component 6 and the hook component 7, when the secondary telescopic fork arm 3 extends to the working position, the steel cable 64 can apply an upward traction force to the secondary telescopic fork arm 3. At the same time, the locking component 8 can lock and fix the effective length of the steel cable 64, thereby forming a stable oblique lifting support for the extended secondary telescopic fork arm 3. The support reduces the bending and sag of the secondary telescopic fork arm 3 under cantilever stress when carrying heavy loads, ensuring the fork arm's operating posture and the safety of cargo handling. During the retraction and reset process of the primary telescopic fork arm 2 and the secondary telescopic fork arm 3, the steel cable 64 can be smoothly wound into the mounting shell 62, while the hook 65 and the slide bar 72 can be autonomously disengaged without affecting the normal extension and retraction of the telescopic fork in both directions. Throughout the entire extension and retraction movement of the primary telescopic fork arm 2 and the secondary telescopic fork arm 3, the limiting component 10 can precisely control the position and posture of the mounting shell 62, so that the mounting shell 62 provides sufficient clearance for the slide bar 72 at the corresponding stage, thereby ensuring smooth and reliable hooking and disengaging actions between the hook 65 and the slide bar 72, and ensuring the stable operation of the entire heavy-duty telescopic and anti-fall mechanism.

[0028] Example 2: Based on Example 1, this example discloses a narrow-section heavy-duty telescopic fork, such as... Figure 2-4 As shown, the hook assembly 7 includes a mounting groove 71 formed on the side end of the secondary telescopic fork arm 3. A slide rod 72 is slidably mounted on the inner wall of the mounting groove 71. A slot 73 is formed on the outer wall of the slide rod 72. Two retaining rings 74 that engage with the slot 73 are symmetrically fixedly mounted on the inner wall of the mounting groove 71. A magnetic piece 75 is fixedly mounted on one end of the slide rod 72 located outside the mounting groove 71. A mounting bracket 76 is fixedly mounted on the side of the mounting plate 5. A magnetic piece 77 is fixedly mounted on the top of the mounting bracket 76. The magnetic pole of the magnetic piece 77 is opposite to that of one of the two magnetic pieces 75 located on the same side that is away from the primary telescopic fork arm 2, and is the same as that of the other magnetic piece 75.

[0029] The implementation principle of this embodiment is as follows:

[0030] During the operation of the telescopic fork, when the primary telescopic fork arm 2 and the secondary telescopic fork arm 3 extend outward, the magnetic plate 75 at the end of the slide rod 72 of the secondary telescopic fork arm 3 away from the telescopic fork fixed arm 1 will approach the magnetic plate 77 at the top of the corresponding mounting bracket 76. Since the magnetic poles on opposite sides are opposite, under the action of the magnetic attraction of opposite poles, the slide rod 72 overcomes the internal constraint and slides outward and extends out of the mounting groove 71. At the same time, the retaining groove 73 on the outer wall of the slide rod 72 and the retaining ring 74 on the inner wall of the mounting groove 71 form a stable engagement limit, so that the slide rod 72 remains reliably extended. Meanwhile, the limiting component 10 releases the limiting constraint on the spring telescopic rod 61. As the secondary telescopic fork arm 3 continues to extend outward, the extended slide rod 72 gradually contacts the mounting shell 62 and applies downward pressure, forcing the spring telescopic rod to... When the first 61 elastically contracts, and the hook 65 is at the top of the mounting shell 62, the sliding rod 72 can smoothly enter the inside of the hook 65 and complete a reliable hook connection. After that, the sliding rod 72 moves synchronously with the secondary telescopic fork arm 3, continuously pulling the hook 65 and the connected steel cable 64, driving the reel 63 inside the mounting shell 62 to synchronously achieve a stable unwinding action. When the sliding rod 72 at the other end of the secondary telescopic fork arm 3 passes the corresponding mounting frame 76, because the magnetic poles of the first magnetic piece 75 and the second magnetic piece 77 are the same on the opposite side, under the action of the like repulsion magnetic force, the sliding rod 72 remains retracted inside the mounting groove 71 and will not extend outward, thereby effectively avoiding interference and jamming between the sliding rod 72 and the mounting shell 62, ensuring smooth operation and stable running of the secondary telescopic fork arm 3 during bidirectional telescopic movement.

[0031] Example 3: Based on Example 1, this example discloses a narrow-section heavy-duty telescopic fork, such as... Figure 4-7 As shown, the locking assembly 8 includes a support frame 81 fixedly installed at the telescopic end of the spring telescopic rod 61. A fixed ring plate 82 coaxially arranged with the drive shaft 66 is fixedly installed on the top surface of the support frame 81. A fixed sleeve 83 is fixedly installed on the side of the fixed ring plate 82. A plurality of locking plates 84 arranged in a ring array are provided through the outer wall of the fixed sleeve 83. A plurality of locking grooves 85 adapted to the locking plates 84 are opened on the outer wall of the drive shaft 66. A plurality of fixed plates 86 opposite to the locking plates 84 are fixedly installed on the side of the fixed ring plate 82. A spring 87 is fixedly installed between the side of the fixed plate 86 and the side of the locking plate 84. A sensing structure 9 adapted to the locking assembly 8 is provided at the end of the support frame 81 away from the spring telescopic rod 61.

[0032] The sensing structure 9 includes a transmission gear 91 rotatably mounted on the end of the support frame 81 and coaxially arranged with the transmission shaft 66. A connecting rod 92 is fixedly mounted on the side of the transmission gear 91. The outer wall of the connecting rod 92 has several slots 93 corresponding to the locking plate 84. A second magnetic plate 97 is slidably mounted on the inner wall of the slots 93. A first magnetic plate 94 corresponding to the second magnetic plate 97 is fixedly mounted on one end of the locking plate 84 located outside the locking groove 85. The magnetic poles of the first magnetic plate 94 and the second magnetic plate 97 are the same. A drive motor 95 is fixedly mounted on the end of the support frame 81. A drive gear 96 meshing with the transmission gear 91 is fixedly mounted on the output end of the drive motor 95.

[0033] The implementation principle of this embodiment is as follows:

[0034] When the primary telescopic fork arm 2 and the secondary telescopic fork arm 3 of the telescopic fork start to run, the drive motor 95 at the end of the support frame 81 is simultaneously energized and starts, driving the drive gear 96 to rotate. The drive gear 96 meshes with the transmission gear 91, thereby driving the transmission gear 91 and the connecting rod 92 connected to it to rotate at high speed. During the high-speed rotation of the connecting rod 92, under the action of centrifugal force, the magnetic plate 97 slides outward along the inner wall of the slot 93, causing the magnetic plate 97 to move towards the outer side of the slot 93 and gradually approach the magnetic plate 94 at the end of the locking plate 84. Since the magnetic plate 94 and the magnetic plate 97 have a weaker magnetic force when they are far apart and have the same relative magnetic poles, when they approach each other, under the action of the like poles repelling each other, the locking plate 84 slides outward along the inner wall of the fixed sleeve 83 and exits the locking groove 85 on the transmission shaft 66, thereby releasing the locking constraint on the transmission shaft 66. Subsequently, when the hook 65 is connected to the slide rod 72, under the continuous traction of the secondary telescopic fork arm 3... Under the action of the reel 63, the reel 63 can rotate freely to achieve smooth unwinding of the steel cable 64. When the secondary telescopic fork arm 3 moves to the predetermined position, the drive motor 95 stops running, the centrifugal force disappears, the magnetic plate 2 97 resets, the repulsive force between the magnetic plate 1 94 and the magnetic plate 2 97 weakens, and the locking plate 84 is re-inserted into the locking groove 85 on the drive shaft 66 under the elastic reset action of the spring 1 87, realizing reliable locking of the drive shaft 66 and the reel 63, keeping the steel cable 64 at a fixed length, thereby forming a stable upward pulling force on the secondary telescopic fork arm 3, effectively suppressing the sag phenomenon that occurs when the fork arm is under heavy load. During the retraction and reset process of the telescopic fork, the drive motor 95 starts synchronously again. Repeating the above actions can release the limiting constraint on the drive shaft 66 again. At this time, under the elastic reset action of the torsion spring 67, the reel 63 can automatically reverse to achieve orderly winding of the steel cable 64, so that the hook 65 can be smoothly reset, preparing for the next telescopic handling operation.

[0035] Example 4: Based on Example 1, this example discloses a narrow-section heavy-duty telescopic fork, such as... Figure 2 , Figure 3 , Figure 4 and Figure 8 As shown, the limiting assembly 10 includes a fixed frame 101 fixedly installed on the top surface of the mounting plate 5. Two partitions 103 are symmetrically fixedly installed on the inner wall of the fixed frame 101. A limiting plate 102 is slidably installed on the inner wall of the end of the fixed frame 101 opposite to the spring telescopic rod 61. The telescopic end of the spring telescopic rod 61 has a limiting groove 104 adapted to the limiting plate 102. A spring 105 is fixedly installed between the limiting plate 102 and the partitions 103. A sliding plate 106 is slidably installed on the inner wall of the end of the fixed frame 101 away from the limiting plate 102. A spring 105 is fixedly installed between the side of the sliding plate 106 and the inner wall of the fixed frame 101. 07. A guide rod 108 is fixedly installed on the side of the limiting plate 102 opposite to the slide plate 106. Two clearance openings 109 adapted to the guide rod 108 are symmetrically opened on the side of the slide plate 106. A spring telescopic rod 1010 is fixedly installed on the top surface of the slide plate 106. The two spring telescopic rods 1010 located at the same end of the two mounting plates 5 are staggered. The telescopic ends of the spring telescopic rods 1010 are symmetrically provided with two inclined surfaces. Two push plates 1011 located directly below the slide rod 72 and corresponding to the two spring telescopic rods 1010 are symmetrically fixedly installed on the bottom surface of the secondary telescopic fork arm 3. The push plates 1011 are L-shaped.

[0036] The implementation principle of this embodiment is as follows:

[0037] In the initial state, the limiting plate 102 is inserted into the limiting groove 104 on the outer wall of the telescopic end of the first spring telescopic rod 61, forming a stable position limit for the first spring telescopic rod 61, keeping it locked and unable to extend or retract freely. When the second-stage telescopic fork arm 3 is running, the push plate 1011 directly below the slide rod 72 at the end away from the telescopic fork fixed arm 1 in its extension direction moves with the fork arm and passes the position of the fixed frame 101. The push plate 1011 first contacts the second spring telescopic rod 1010 and applies a pushing force to it, and then pushes... The sliding plate 106 slides inside the fixed frame 101. During the sliding process, the guide rod 108 can smoothly enter the clearance slot 109 on the side of the sliding plate 106, providing sufficient space for the movement of the limiting plate 102. At this time, under the elastic force of the second spring 105, the limiting plate 102 slides inward to the fixed frame 101 and separates from the limiting groove 104 on the first spring telescopic rod 61, thereby releasing the limiting constraint on the first spring telescopic rod 61, so that the sliding rod 72 directly above the sliding plate 106 can move in accordance with the movement of the sliding plate 106. When the secondary telescopic fork arm 3 moves, it can smoothly drive the spring telescopic rod 61 to shorten, providing clearance for the movement of the slide rod 72 and ensuring that the hooking action between the slide rod 72 and the hook 65 is reliably completed. After the slide rod 72 completes the hooking or unhooking action, the push plate 1011 continues to move with the fork arm and separates from the spring telescopic rod 1010 under the action of the inclined plane. At this time, under the combined action of the spring 107 and the clearance port 109, the guide rod 108 and the limiting plate 102 can be driven to reset synchronously. 102 is reinserted into the limiting groove 104 on the outer wall of the spring telescopic rod 61, thereby locking the spring telescopic rod 61 again. In the same telescopic direction, the push plate 1011 directly below the slide bar 72 near the end of the telescopic fork fixing arm 1 is misaligned with the spring telescopic rod 1010 on the same path. The push plate 1011 cannot contact the spring telescopic rod 1010, so the limiting release action of the spring telescopic rod 61 at that point will not be triggered, ensuring the normal operation of the telescopic fork.

[0038] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A heavy-duty telescopic fork with a narrow cross section, comprising a telescopic fork fixing arm (1) and a primary telescopic fork arm (2) disposed on the telescopic fork fixing arm (1), wherein a secondary telescopic fork arm (3) is disposed on the primary telescopic fork arm (2), and a driving structure (4) for driving the primary telescopic fork arm (2) and the secondary telescopic fork arm (3) is disposed on the telescopic fork fixing arm (1), wherein two mounting plates (5) are symmetrically fixedly mounted on the bottom surface of the telescopic fork fixing arm (1), characterized in that, Both ends of the top surface of the mounting plate (5) are provided with spring telescopic rods (61), and the spring telescopic rods (61) are fixedly connected to the through-holes. The telescopic end of the spring telescopic rods (61) is fixedly installed with a mounting shell (62). A steel cable (64) is provided on the inner side of the mounting shell (62). A hook (65) is fixedly installed on the pulling end of the steel cable (64). A drive shaft (66) is provided through the side of the mounting shell (62). The top surface of the mounting plate (5) is provided with... The steel cable (64) is adapted to the fall arrest component (6). The two sides of the secondary telescopic fork arm (3) are symmetrically provided with two sliding rods (72) adapted to the hooks (65). The sides of the secondary telescopic fork arm (3) are provided with a hook assembly (7) for installing the sliding rods (72). The two ends of the mounting plate (5) are provided with locking components (8) for locking the fall arrest component (6). The two ends of the mounting plate (5) are provided with limiting components (10) for controlling the fall arrest component (6) to move. The locking assembly (8) includes a support frame (81) fixedly installed at the telescopic end of the spring telescopic rod (61). A fixed ring plate (82) coaxially arranged with the drive shaft (66) is fixedly installed on the top surface of the support frame (81). A fixed sleeve (83) is fixedly installed on the side of the fixed ring plate (82). A plurality of locking plates (84) arranged in a ring array are provided through the outer wall of the fixed sleeve (83). A plurality of locking grooves (85) adapted to the locking plates (84) are opened on the outer wall of the drive shaft (66). A plurality of fixed plates (86) opposite to the locking plates (84) are fixedly installed on the side of the fixed ring plate (82). A spring (87) is fixedly installed between the side of the fixed plate (86) and the side of the locking plate (84). A sensing structure (9) adapted to the locking assembly (8) is provided at the end of the support frame (81) away from the spring telescopic rod (61). The sensing structure (9) includes a transmission gear (91) rotatably mounted on the end of the support frame (81) and coaxially arranged with the transmission shaft (66). A connecting rod (92) is fixedly mounted on the side of the transmission gear (91). A plurality of slots (93) corresponding to the locking plate (84) are opened on the outer wall of the connecting rod (92). A magnetic plate two (97) is slidably mounted on the inner wall of the slot (93). A magnetic plate one (94) corresponding to the magnetic plate two (97) is fixedly mounted on one end of the locking plate (84) located outside the locking groove (85). A drive motor (95) is fixedly mounted on the end of the support frame (81). A drive gear (96) meshing with the transmission gear (91) is fixedly mounted on the output end of the drive motor (95).

2. The narrow-section heavy-duty telescopic fork according to claim 1, characterized in that, The fall arrestor assembly (6) includes a reel (63) rotatably mounted on the inner wall of the mounting housing (62), a steel cable (64) evenly wound on the inner side of the reel (63), a drive shaft (66) coaxially arranged and fixedly connected to the reel (63), a torsion spring (67) fitted on the outer wall of the drive shaft (66), and the two ends of the torsion spring (67) are fixedly connected to the drive shaft (66) and the mounting housing (62) respectively.

3. The narrow-section heavy-duty telescopic fork according to claim 1, characterized in that, The steel cable (64) passes through the mounting shell (62) at the top of the mounting shell (62).

4. The narrow-section heavy-duty telescopic fork according to claim 1, characterized in that, The hook assembly (7) includes a mounting groove (71) opened on the side end of the secondary telescopic fork arm (3). The slide rod (72) is slidably installed on the inner wall of the mounting groove (71). The outer wall of the slide rod (72) is provided with a slot (73). Two retaining rings (74) that engage with the slot (73) are symmetrically fixedly installed on the inner wall of the mounting groove (71). A magnetic piece (75) is fixedly installed at one end of the slide rod (72) located outside the mounting groove (71). A mounting bracket (76) is fixedly installed on the side of the mounting plate (5). A magnetic piece (77) is fixedly installed at the top of the mounting bracket (76).

5. The narrow-section heavy-duty telescopic fork according to claim 4, characterized in that, The magnetic pole of the second magnetic piece (77) is opposite to that of one of the two magnetic pieces (75) located on the same side, which is away from the first telescopic fork arm (2), and is the same as that of the other magnetic piece (75).

6. The narrow-section heavy-duty telescopic fork according to claim 1, characterized in that, The magnetic poles of magnetic plate one (94) and magnetic plate two (97) are the same.

7. The narrow-section heavy-duty telescopic fork according to claim 1, characterized in that, The limiting component (10) includes a fixed frame (101) fixedly installed on the top surface of the mounting plate (5). Two partitions (103) are symmetrically fixedly installed on the inner wall of the fixed frame (101). A limiting plate (102) is slidably installed on the inner wall of the fixed frame (101) opposite to the first spring telescopic rod (61). A limiting groove (104) adapted to the limiting plate (102) is opened at the telescopic end of the first spring telescopic rod (61). A second spring (105) is fixedly installed between the limiting plate (102) and the partition (103). A sliding plate (106) is slidably installed on the inner wall of the fixed frame (101) away from the limiting plate (102). The side of the sliding plate (106) is parallel to the inner wall of the first spring telescopic rod (61). Spring 3 (107) is fixedly installed between the inner walls of the fixed frame (101). Guide rod (108) is fixedly installed on the side opposite to the sliding plate (106) of the limiting plate (102). Two clearance openings (109) adapted to the guide rod (108) are symmetrically opened on the side of the sliding plate (106). Spring telescopic rod 2 (1010) is fixedly installed on the top surface of the sliding plate (106). The two spring telescopic rods 2 (1010) located at the same end of the two mounting plates (5) are staggered. Two push plates (1011) located directly below the slide rod (72) and corresponding to the two spring telescopic rods 2 (1010) are symmetrically fixedly installed on the bottom surface of the secondary telescopic fork arm (3).

8. The narrow-section heavy-duty telescopic fork according to claim 7, characterized in that, The telescopic end of the second spring telescopic rod (1010) is symmetrically provided with two inclined surfaces, and the push plate (1011) is set in an L-shape.

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