Two-stage telescopic mechanism and telescopic pallet fork

Abstract

The secondary telescopic mechanism comprises a telescopic base and primary telescopic pieces arranged in the direction of the two ends of the telescopic base in a sliding mode, and secondary telescopic pieces are further arranged on the faces, away from the telescopic base, of the primary telescopic pieces in a sliding mode. The starting ends of the first belt and the second belt are respectively fixed at the right end and the left end of the telescopic base; the tail end of the first belt and the tail end of the second belt penetrate through the left end and the right end of the first-stage telescopic piece correspondingly and are fixed to the right end and the left end of the second-stage telescopic piece correspondingly. And a first guide assembly and a second guide assembly are respectively arranged between the first-stage telescopic piece and the telescopic base and between the first-stage telescopic piece and the second-stage telescopic piece. The telescopic pallet fork has the bidirectional telescopic function, can adapt to different application scenes, meanwhile, due to the design of the V-shaped guide rails and the pulleys, larger loads can be borne, the telescopic length is greatly increased, and the stability and safety of the pallet fork in the operation process are guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of logistics warehousing, and particularly relates to a two-stage telescopic mechanism and a telescopic fork. Background Art

[0002] In the field of modern logistics warehousing, as an important loading and unloading device, the performance of the fork directly affects the efficiency and safety of logistics operations. Traditional fork devices often can only have single-stage telescoping, unable to adapt to goods of different sizes and shapes, and at the same time, there are also problems such as low efficiency, complex operation, and insufficient stability during the operation process.

[0003] The primary drive of the existing fork telescopic picking mechanism usually drives the rack on the fork body to perform linear motion through gears or sprockets, and the extended distance is limited by the length of the transmission rack itself. For two-stage forks with a longer telescopic distance, most of them adopt a telescopic guide rail structure, with both the load capacity and the single-stage telescopic distance being relatively small.

[0004] Therefore, researching and developing a fork device with a two-stage telescopic function has become an important direction for the technological upgrading of the logistics industry. Summary of the Utility Model

[0005] Aiming at the problems of weak load-bearing capacity and short telescopic distance of the telescopic fork in the prior art, the utility model provides a two-stage telescopic mechanism and a telescopic fork to solve the above problems.

[0006] According to the first aspect of the present application, a two-stage telescopic mechanism is provided, including a telescopic base and a first-stage telescopic member slidably arranged along both ends of the telescopic base. A second-stage telescopic member is also slidably arranged on the side of the first-stage telescopic member away from the telescopic base; it further includes a first belt and a second belt. The starting ends of the first belt and the second belt are respectively fixed to the right end and the left end of the telescopic base; the ending ends of the first belt and the second belt respectively pass through the left end and the right end of the first-stage telescopic member and are respectively fixed to the right end and the left end of the second-stage telescopic member; a first guiding component and a second guiding component are respectively arranged between the first-stage telescopic member and the telescopic base, and between the second-stage telescopic member.

[0007] By adopting the above technical solution, when the first-stage telescopic member slides left / right along the telescopic base, the first belt / second belt will pull the second-stage telescopic member to slide synchronously, and their sliding strokes and speeds are the same. At the same time, the first guiding component and the second guiding component can ensure the direction consistency and stability of the first-stage telescopic member and the second-stage telescopic member during sliding.

[0008] In some specific embodiments, a first pulley and a second pulley are respectively rotatably arranged at the left and right ends of the first-stage telescopic member, and the first belt and the second belt are respectively wound around the first pulley and the second pulley.

[0009] By adopting the above technical solution, the arrangement of the first pulley and the second pulley can avoid direct friction when the first belt and the second belt pass through the first-stage telescopic member, reduce the wear between the two, and at the same time, the transmission design of the pulley enables the tension of the belt to be more evenly distributed during the entire telescopic process, avoiding problems such as belt slipping and breakage caused by uneven tension.

[0010] In some specific embodiments, the first guiding assembly includes a first guide rail and a first pulley set respectively arranged on the first-stage telescopic member and the telescopic base, and the second guiding assembly includes a second guide rail and a second pulley set respectively arranged on the second-stage telescopic member and the first-stage telescopic member.

[0011] By adopting the above technical solution, the cooperation between the guide rail and the pulley set enhances the structural stability of the first-stage telescopic member and the second-stage telescopic member, ensures that the first-stage telescopic member and the second-stage telescopic member can move along a predetermined trajectory, avoids deviation, guarantees the positioning accuracy, and at the same time can reduce the friction during telescoping, reduce the wear of each component, and improve the efficiency and lifespan of the structure.

[0012] In some specific embodiments, both the first guide rail and the second guide rail are linear guide rails, and the shapes of the parts of the first guide rail and the second guide rail that cooperate with the first pulley set and the second pulley set are V-shaped.

[0013] By adopting the above technical solution, the cooperation between the V-shaped guide rail and the V-shaped pulley set can effectively limit the movement direction of the telescopic member, reduce lateral and longitudinal deviation, improve the positioning accuracy, have smaller friction, move more smoothly and smoothly, can evenly distribute the load, and the V-shaped guide rail has a high anti-deformation ability and can bear a large load without deformation, thereby improving the overall load-bearing capacity of the telescopic member.

[0014] In some specific embodiments, left and right limit blocks for restricting the left and right movement strokes of the first-stage telescopic member are respectively arranged at the left and right ends of the telescopic base. The left and right limit blocks are arranged in a vertically offset manner, and first and second stop blocks cooperating with the left and right limit blocks are arranged on the first-stage telescopic member.

[0015] By adopting the above technical solution, the left and right limit blocks cooperate with the first and second stop blocks to accurately control the left and right movement strokes of the first-stage telescopic member, avoid the telescopic member exceeding the predetermined range. The vertically offset design can effectively prevent the limit blocks from interfering with each other, and at the same time, the positions of the limit blocks and the stop blocks can be adjusted according to the situation to be applicable to different application scenarios.

[0016] According to the second aspect of the present application, a telescopic fork is provided, which includes the above-mentioned secondary telescopic mechanism, and also includes a fork base. The bottom of the telescopic base is fixed on the fork base, and a driving component is further provided below the side surface of the fork base. The driving component cooperates with the bottom surface of the first-stage telescopic member and drives the first-stage telescopic member to drive the second-stage telescopic member to perform linear motion along both ends of the telescopic base.

[0017] By adopting the above technical solution, the cooperation between the driving component and the bottom surface of the first-stage telescopic member can achieve efficient linear motion, significantly improve the operation efficiency of the telescopic fork. The telescopic base is fixed on the fork base, providing a stable support structure, enhancing the stability and load-bearing capacity of the fork. The cooperation between the driving component and the first-stage telescopic member can achieve high-precision positioning control, ensuring the accuracy of the telescopic fork during operation.

[0018] In some specific embodiments, the driving component includes a first driven wheel and a second driven wheel arranged at the same height at both ends of the fork base. A driving wheel is provided between the first driven wheel and the second driven wheel. The height of the driving wheel is lower than that of the first driven wheel and is arranged close to the first driven wheel.

[0019] By adopting the above technical solution, the driving wheel is arranged between the two driven wheels and is closely arranged next to the first driven wheel, which helps to transmit a greater driving force and improve the driving efficiency. The first driven wheel and the second driven wheel at the same height can ensure that the fork is evenly stressed during movement, reducing structural deformation and damage caused by uneven stress.

[0020] In some specific embodiments, the driving component further includes a double-sided rack belt. The inner racks of the double-sided rack belt are respectively meshed with the first driven wheel and the second driven wheel. After the double-sided rack belt bypasses the first driven wheel, the outer rack of the double-sided rack belt is meshed with the top of the driving wheel.

[0021] By adopting the above technical solution, the double-sided rack belt provides more stable support through multi-point meshing, reducing the risk of single-point failure, effectively avoiding the slipping phenomenon that may occur in traditional transmission methods, improving the reliability of the transmission. The design of the double-sided rack belt makes the force between the driven wheel and the driving wheel more uniform, reducing the wear of a single part, extending the service life of the equipment, and being able to achieve high-precision motion control, improving the positioning accuracy during the telescopic process of the fork.

[0022] In some specific embodiments, the driving component further includes a tensioning wheel arranged between the driving wheel and the second driven wheel, and the tensioning wheel is arranged close to the driving wheel. After the double-sided rack belt bypasses the top of the driving wheel, the inner rack of the double-sided rack belt is meshed with the bottom of the tensioning wheel.

[0023] By adopting the above technical solution, the tension pulley can effectively adjust the tension of the double-sided rack belt, maintain the appropriate tightness of the rack belt, and avoid transmission problems caused by slack or over-tightening. The tension pulley is arranged close to the driving wheel, ensuring the efficient transmission of the driving force, reducing the transmission loss, and improving the transmission efficiency.

[0024] In some specific embodiments, a synchronous rack meshing with the double-sided rack belt is further provided at the bottom of the first-level telescopic member, and a track is further provided below the matching part of the double-sided rack belt and the synchronous rack for preventing the double-sided rack belt from falling off.

[0025] By adopting the above technical solution, the synchronous rack arranged at the bottom of the first-level telescopic member meshes with the double-sided rack belt to ensure their synchronous movement, enabling high-precision motion control, improving the positioning accuracy of the telescopic fork during the telescopic process, reducing errors, and the anti-falling function provided by the track can effectively prevent the double-sided rack belt from disengaging from the driven wheel during operation, ensuring the safety and continuity of the operation.

[0026] The beneficial effects of this application compared with the prior art are as follows:

[0027] The second-level telescopic mechanism of this application realizes the synchronous sliding of the first-level telescopic member and the second-level telescopic member through the first belt and the second belt, ensuring that their sliding strokes and speeds are consistent. The first guiding component and the second guiding component enhance the structural stability through the cooperation of the guide rail and the pulley group, ensuring the consistency and stability of the movement direction of the telescopic member, improving the positioning accuracy. The cooperation of the V-shaped guide rail and the V-shaped pulley group enables the second-level telescopic mechanism to bear a greater load. The left limit block and the right limit block cooperate with the first stop block and the second stop block to accurately control the movement stroke of the first-level telescopic member and prevent it from exceeding the predetermined range. The up-and-down staggered design prevents the limit blocks from interfering with each other and increases the adaptability of the telescopic mechanism.

[0028] The telescopic fork of this application realizes efficient linear motion through the cooperation of the driving component and the bottom surface of the first-level telescopic member, significantly improving the operation efficiency of the telescopic fork. The reasonable configuration of the driving wheel and the driven wheel ensures the transmission of a greater driving force and uniform force, improving the driving efficiency and positioning accuracy. The double-sided rack belt provides more stable support through multi-point meshing, avoiding slipping. At the same time, by using the cooperation of the synchronous rack and the double-sided rack belt, the maximum left / right movement length of the fork is 130% of the rack length, greatly improving the movement stroke and efficiency of the fork. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings are included to provide a further understanding of the embodiments and are incorporated in and constitute a part of this specification. The drawings illustrate the embodiments and, together with the description, are used to explain the principles of the present utility model. Other embodiments and many of the intended advantages of the embodiments will be readily apparent as they become better understood by reference to the following detailed description. The elements of the drawings are not necessarily to scale with each other. Like reference numerals refer to corresponding like parts.

[0030] Figure 1 is a schematic diagram of a secondary telescopic structure according to an embodiment of the present application;

[0031] Figure 2 is another mating schematic diagram of a secondary telescopic mechanism according to an embodiment of the present application;

[0032] Figure 3 is a schematic diagram of a telescopic fork structure according to an embodiment of the present application;

[0033] Figure 4 is a schematic diagram of a double fork structure according to an embodiment of the present application.

[0034] The meanings of the numbers in the figure:

[0035] Telescopic base 01, primary telescopic member 02, secondary telescopic member 03, first belt 04, second belt 05, first guiding assembly 06, second guiding assembly 07, first pulley 08, second pulley 09, first guide rail 10, first pulley block 11, second guide rail 12, second pulley block 13, left limit block 14, right limit block 15, fork base 16, first driven wheel 17, second driven wheel 18, driving wheel 19, double-sided rack belt 20, tensioning wheel 21, synchronous rack 22, supporting rail 23, driving shaft 24. Detailed Description of the Embodiments

[0036] In the following detailed description, reference is made to the accompanying drawings which form a part of the detailed description and in which are shown illustrative specific embodiments in which the present utility model may be practiced. In this regard, directional terms, such as “top”, “bottom”, “left”, “right”, “up”, “down”, etc., are used with reference to the orientation of the described figures. Since the components of the embodiments may be positioned in several different orientations, the directional terms are used for purposes of illustration and are in no way limiting. It should be understood that other embodiments may be utilized or logical changes may be made without departing from the scope of the present utility model. Accordingly, the following detailed description should not be taken in a limiting sense, and the scope of the present utility model is defined by the appended claims.

[0037] According to a first aspect of the present application, a secondary telescopic mechanism is proposed, Figure 1The schematic diagram of the secondary telescopic structure according to an embodiment of the present application is shown. As shown in the figure, the mechanism includes a telescopic base 01 and a primary telescopic member 02 slidably disposed along both ends of the telescopic base 01. A secondary telescopic member 03 is also slidably disposed on the side of the primary telescopic member 02 away from the telescopic base 01. It further includes a first belt 04 and a second belt 05. The starting ends of the first belt 04 and the second belt 05 are respectively fixed to the right end and the left end of the telescopic base 01. The ending ends of the first belt 04 and the second belt 05 respectively pass through the left end and the right end of the primary telescopic member 02 and are respectively fixed to the right end and the left end of the secondary telescopic member 03. First guiding components 06 and second guiding components 07 are respectively provided between the primary telescopic member 02 and the telescopic base 01 and the secondary telescopic member 03.

[0038] Specifically, the starting ends and the ending ends of the first belt 04 and the second belt 05 are installed in a detachable form including but not limited to a synchronous belt clip, which is convenient for later replacement and maintenance, and at the same time, the tension of the belt can be adjusted according to the situation.

[0039] Further, when the primary telescopic member 02 moves to the left, the first belt 04 is subjected to a leftward pulling force at the mating portion with the primary telescopic member 02, so that the ending end of the first belt 04 drives the secondary telescopic member 03 to move leftward synchronously with the primary telescopic member 02. Similarly, when the primary telescopic member 02 moves to the right, the second belt 05 is subjected to a rightward pulling force, so that the secondary telescopic member 03 moves rightward synchronously with the primary telescopic member 02.

[0040] By adopting the above technical solution, when the primary telescopic member 02 slides leftward / rightward along the telescopic base 01, the first belt 04 / second belt 05 will pull the secondary telescopic member 03 to slide synchronously, and their sliding strokes and speeds are the same. At the same time, the first guiding components 06 and the second guiding components 07 can ensure the direction consistency and stability of the sliding of the primary telescopic member 02 and the secondary telescopic member 03.

[0041] In some specific embodiments, first pulleys 08 and second pulleys 09 are respectively rotatably disposed at the left and right ends of the primary telescopic member 02. The first belt 04 and the second belt 05 are respectively wound around the first pulley 08 and the second pulley 09.

[0042] Specifically, when the first belt 04 passes through the left end of the primary telescopic member 02, it is wound around the first pulley 08, and the same is true for the first belt 05.

[0043] By adopting the above technical solution, the setting of the first pulley 08 and the second pulley 09 can avoid the direct friction between the first belt 04 and the second belt 05 when passing through the first-stage telescopic member 02, reduce the wear between the two, and at the same time, the transmission design of the pulley enables the tension of the belt to be more evenly distributed during the entire telescopic process, avoiding problems such as belt slipping and breakage caused by uneven tension.

[0044] In some specific embodiments, the first guiding assembly 06 includes a first guide rail 10 and a first pulley group 11 respectively disposed on the first-stage telescopic member 02 and the telescopic base 01, and the second guiding assembly 07 includes a second guide rail 12 and a second pulley group 13 respectively disposed on the second-stage telescopic member 03 and the first-stage telescopic member 02.

[0045] Specifically, both the first pulley group 11 and the second pulley group 13 are composed of a number of upper and lower sub-pulleys, and the number distribution of the upper and lower sub-pulleys adopts a staggered arrangement. For example, if the number of sub-pulleys in the first group is one upper and two lower, then the number of sub-pulleys in the second group is two upper and one lower, and so on, which can ensure that the first pulley group 11 and the second pulley group 13 can provide strong supporting forces.

[0046] By adopting the above technical solution, the cooperation of the guide rail and the pulley group enhances the structural stability of the first-stage telescopic member 02 and the second-stage telescopic member 03, ensures that the first-stage telescopic member 02 and the second-stage telescopic member 03 can move along a predetermined trajectory, avoids deviation, ensures the positioning accuracy, and at the same time can also reduce the friction during telescoping, reduce the wear of each component, and improve the efficiency and service life of the structure.

[0047] Figure 2 Shows another mating schematic diagram of the two-stage telescopic mechanism according to an embodiment of the present application, as Figure 1-2 shown, both the first guide rail 10 and the second guide rail 12 are linear guide rails, and the shapes of the portions of the first guide rail 10 and the second guide rail 12 that cooperate with the first pulley group 11 and the second pulley group 13 are V-shaped.

[0048] Specifically, taking the cooperation between the first guide rail 10 and the first pulley group 11 as an example, the top and bottom of the first guide rail 10 cooperate with the upper and lower sub-pulleys of the first pulley group 11, and both the top and bottom of the first guide rail 10 form V-shaped chamfers, and the pulley grooves of the first pulley group 11 are also correspondingly provided with V-shaped chamfers, ensuring the accuracy of the stroke direction of the first guide rail 10, enabling the first guiding assembly 06 to provide a strong load-bearing capacity for the cooperation between the first-stage telescopic member 02 and the telescopic base 01, and further enabling the entire two-stage telescopic mechanism to bear a greater load. The same applies to the cooperation between the second guide rail 12 and the second pulley group 13.

[0049] By adopting the above technical solution, the cooperation between the V-shaped first guide rail 10, second guide rail 12 and the V-shaped first pulley set 11, second pulley set 13 can effectively limit the movement directions of the first telescopic member 02 and the second telescopic member 03, reduce the lateral and longitudinal offsets, improve the positioning accuracy, and at the same time have less friction, smoother and more stable movement, can evenly distribute the load, and the V-shaped structure has a high anti-deformation ability and can bear a large load without deformation, thereby improving the overall load-bearing capacity of the secondary telescopic mechanism.

[0050] In some specific embodiments, left and right limit blocks 14 and 15 for limiting the left and right movement strokes of the primary telescopic member 02 are respectively provided at the left and right ends of the telescopic base 01. The left limit block 14 and the right limit block 15 are arranged with an upper and lower dislocation, and first stoppers (not shown in the figure) and second stoppers (not shown in the figure) cooperating with the left limit block 14 and the right limit block 15 are provided on the primary telescopic member 02.

[0051] Specifically, the first stopper and the second stopper are respectively arranged at the right end and the left end of the primary telescopic member 02. When the primary telescopic member 02 moves to the left, the first stopper moves to the left and touches the left limit block 14, and at this time, the maximum left movement stroke is reached. When the primary telescopic member 02 moves to the right, the second stopper moves to the right and touches the right limit block 15, and at this time, the maximum right movement stroke is reached.

[0052] Furthermore, the stroke limit is not limited to the cooperation between the stopper and the limit block, and electrical limit forms such as limit switches can also be used to limit the maximum stroke of the secondary telescopic mechanism.

[0053] By adopting the above technical solution, the left limit block 14, the right limit block 15 cooperating with the first stopper and the second stopper can accurately control the left and right movement strokes of the primary telescopic member 02, avoid the telescopic member exceeding the predetermined range, and the upper and lower dislocation design can effectively prevent the limit blocks from interfering with each other. At the same time, the positions of the limit block and the stopper can be adjusted according to the situation, which is applicable to different application scenarios.

[0054] According to the second aspect of the present application, a telescopic fork is proposed. Figure 3 The schematic structural diagram of the telescopic fork according to the embodiment of the present application is shown. As Figure 1-3 shown, the fork includes the above-mentioned secondary telescopic mechanism, and further includes a fork base 16. The bottom of the telescopic base 01 is fixed on the fork base 16, and a driving assembly is further provided below the side surface of the fork base 16. The driving assembly cooperates with the bottom surface of the primary telescopic member 02 and drives the primary telescopic member 02 to drive the secondary telescopic member 03 to perform linear movement along the two ends of the telescopic base 01.

[0055] By adopting the above technical solution, the driving component cooperates with the bottom surface of the first telescopic member 02, enabling efficient linear motion, significantly improving the operating efficiency of the telescopic forklift. The telescopic base 01 is fixed on the forklift base 16, providing a stable support structure, enhancing the stability and load-bearing capacity of the forklift. The cooperation between the driving component and the first telescopic member 02 can achieve high-precision positioning control, ensuring the accuracy of the telescopic forklift during operation.

[0056] In some specific embodiments, the driving component includes a first driven wheel 17 and a second driven wheel 18 placed at the same height at both ends of the forklift base 16. A driving wheel 19 is provided between the first driven wheel 17 and the second driven wheel 18. The height of the driving wheel 19 is lower than that of the first driven wheel 17 and is arranged close to the first driven wheel 17.

[0057] By adopting the above technical solution, the driving wheel 19 is placed between the two driven wheels and is arranged close to the first driven wheel 17, which helps to transmit a greater driving force and improve the driving efficiency. The first driven wheel 17 and the second driven wheel 18 at the same height can ensure that the forklift is evenly stressed during movement, reducing structural deformation and damage caused by uneven stress.

[0058] In some specific embodiments, the driving component further includes a double-sided rack belt 20. The inner racks of the double-sided rack belt 20 are respectively meshed with the first driven wheel 17 and the second driven wheel 18. After the double-sided rack belt 20 bypasses the first driven wheel 17, the outer rack of the double-sided rack belt 20 is meshed with the top of the driving wheel 19.

[0059] By adopting the above technical solution, the double-sided rack belt 20 provides more stable support through multi-point meshing, reducing the risk of single-point failure, effectively avoiding the slipping phenomenon that may occur in traditional transmission methods, improving the reliability of the transmission. The design of the double-sided rack belt 20 makes the force between the driven wheels and the driving wheel 19 more uniform, reducing the wear of a single part, extending the service life of the equipment, and enabling high-precision motion control, improving the positioning accuracy during the telescopic process of the forklift.

[0060] In some specific embodiments, the driving component further includes a tensioning wheel 21 placed between the driving wheel 19 and the second driven wheel 18, and the tensioning wheel 21 is arranged close to the driving wheel 19. After the double-sided rack belt 20 bypasses the top of the driving wheel 19, the inner rack of the double-sided rack belt 20 is meshed with the bottom of the tensioning wheel 21.

[0061] By adopting the above technical solution, the setting of the tensioning wheel 21 can effectively adjust the tension of the double-sided rack belt 20, maintaining the appropriate tightness of the double-sided rack belt 20, avoiding transmission problems caused by slack or over-tightening. The tensioning wheel 21 is arranged close to the driving wheel 19, ensuring the efficient transmission of the driving force, reducing transmission losses, and improving the transmission efficiency.

[0062] In some specific embodiments, a synchronous rack 22 meshing with the double-sided rack belt 20 is further provided at the bottom of the first-stage telescopic member 02, and a track 23 for preventing the double-sided rack belt 20 from falling off is further provided below the mating portion of the double-sided rack belt 20 and the synchronous rack 22.

[0063] Furthermore, based on the structure of the second-stage telescopic mechanism, the telescopic stroke of the telescopic fork is greater than the length of the synchronous rack 22. When the first-stage telescopic member 02 and the second-stage telescopic member 03 are telescoped to the maximum stroke, the total length of the telescopic fork is greater than or equal to 130% of the synchronous rack 22.

[0064] By adopting the above technical solution, the synchronous rack 22 provided at the bottom of the first-stage telescopic member 02 meshes with the double-sided rack belt 20 to ensure synchronous movement of the two, enabling high-precision motion control, improving the positioning accuracy of the telescopic fork during the telescopic process, reducing errors, and the anti-falling function provided by the track 23 can effectively prevent the double-sided rack belt from disengaging from the driven wheel during operation, ensuring the safety and continuity of the operation.

[0065] Figure 4 FIG. shows a schematic diagram of a double-fork structure according to an embodiment of the present application, as Figure 1-4 shown, the drive wheels 19 of the two telescopic forks are connected to the same drive motor (not shown in the figure) through a drive shaft 24, and the telescopic forks on both sides are controlled to telescope synchronously by the drive motor. At the same time, the forward and reverse functions of the drive motor enable the drive wheels 19 to precisely control the telescopic fork to telescope left / right.

[0066] The second-stage telescopic mechanism of the present application has a two-way telescopic function, can adapt to goods of different sizes and shapes, improves the versatility and flexibility of the mechanism. The second-stage telescopic mechanism adopts a V-shaped guide rail and a pulley group, and the load is significantly increased compared with a telescopic guide rail of the same length. The telescopic length is increased by 130% compared with the stroke of the telescopic guide rail. The telescopic fork adopts a motor drive mode to achieve fast and precise telescoping of the second-stage telescopic mechanism, improving the operation efficiency. The forward and reverse drive of the motor and the precise control system achieve precise control of the telescopic direction and speed of the fork, improving the convenience and safety of the operation. Through the optimized design of the structure and the adoption of advanced balancing technology, the stability and safety of the telescopic fork during operation are ensured.

[0067] Obviously, those skilled in the art can make various modifications and changes to the embodiments of the present utility model without departing from the spirit and scope of the present utility model. In this way, if these modifications and changes are within the scope of the claims of the present utility model and their equivalent forms, the present utility model also aims to cover these modifications and changes. The word "comprising" does not exclude the presence of other elements or steps not listed in the claims. The simple fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage. Any reference signs in the claims should not be construed as limiting the scope.

Claims

1. A two-stage telescopic mechanism, characterized in that, It includes a telescopic base and a first-stage telescopic member slidably disposed along both ends of the telescopic base. A second-stage telescopic member is also slidably disposed on a surface of the first-stage telescopic member away from the telescopic base. It further includes a first belt and a second belt. The starting ends of the first belt and the second belt are respectively fixed to the right end and the left end of the telescopic base. The ending ends of the first belt and the second belt respectively pass through the left end and the right end of the first-stage telescopic member, and are respectively fixed to the right end and the left end of the second-stage telescopic member. First guiding assemblies and second guiding assemblies are respectively provided between the first-stage telescopic member and the telescopic base, and the second-stage telescopic member.

2. The telescopic mechanism according to claim 1, wherein, First pulleys and second pulleys are respectively rotatably disposed at the left and right ends of the first-stage telescopic member. The first belt and the second belt are respectively wound around the first pulley and the second pulley.

3. The telescopic mechanism according to claim 1, wherein The first guiding assembly includes a first guide rail and a first pulley group respectively disposed on the first-stage telescopic member and the telescopic base. The second guiding assembly includes a second guide rail and a second pulley group respectively disposed on the second-stage telescopic member and the first-stage telescopic member.

4. The telescopic mechanism according to claim 3, characterized in that, Both the first guide rail and the second guide rail are linear guide rails, and the shapes of the portions of the first guide rail and the second guide rail that cooperate with the first pulley group and the second pulley group are V-shaped.

5. The telescopic mechanism according to claim 1, wherein Left limit blocks and right limit blocks for restricting the left and right movement strokes of the first-stage telescopic member are respectively provided at the left and right ends of the telescopic base. The left limit blocks and the right limit blocks are arranged in a vertically offset manner, and first stop blocks and second stop blocks cooperating with the left limit blocks and the right limit blocks are provided on the first-stage telescopic member.

6. A telescopic fork, comprising the secondary telescopic mechanism according to any one of claims 1-5, characterized in that, It includes a fork base. The bottom of the telescopic base is fixed to the fork base, and a driving assembly is further provided below the side surface of the fork base. The driving assembly cooperates with the bottom surface of the first-stage telescopic member and drives the first-stage telescopic member to drive the second-stage telescopic member to perform linear motion along both ends of the telescopic base.

7. The forklift fork according to claim 6, characterized in that, The driving assembly includes a first driven wheel and a second driven wheel at the same height at both ends of the fork base. A driving wheel is provided between the first driven wheel and the second driven wheel. The height of the driving wheel is lower than that of the first driven wheel and is disposed close to the first driven wheel.

8. The forklift tine according to claim 7, wherein The driving assembly further includes a double-sided rack belt. The inner racks of the double-sided rack belt are respectively engaged with the first driven wheel and the second driven wheel. After the double-sided rack belt bypasses the first driven wheel, the outer rack of the double-sided rack belt is engaged with the top of the driving wheel.

9. The forklift tine according to claim 8, characterized in that, The driving assembly further includes a tensioning wheel disposed between the driving wheel and the second driven wheel. The tensioning wheel is disposed close to the driving wheel. After the double-sided rack belt bypasses the top of the driving wheel, the inner rack of the double-sided rack belt is engaged with the bottom of the tensioning wheel.

10. The forklift tine according to claim 9, characterized in that, A synchronous rack engaged with the double-sided rack belt is further provided at the bottom of the first-stage telescopic member, and a track for preventing the double-sided rack belt from falling off is further provided below the portion where the double-sided rack belt cooperates with the synchronous rack.

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