Lift truck with self-locking function

Abstract

A driving device of the lift truck with the self-locking function comprises a worm gear and a worm which are in transmission fit with each other, the worm is used for being in transmission connection with external driving force, the worm gear is connected to a movable part through a traction rope, and a lifting platform is driven to ascend or descend by rotating the worm gear to wind or release the traction rope. The lead angle of the worm is smaller than the equivalent friction angle between meshing gear teeth between the worm gear and the worm. Therefore, the worm can only drive the worm gear to rotate, the worm gear cannot drive the worm to rotate, self-locking of the driving device is achieved when the worm gear rotates reversely, it is guaranteed that the lifting platform cannot fall off when the worm stops rotating, and equipment damage and personal injury are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of lifting vehicles, in particular to a lifting vehicle with self-locking function. Background Art

[0002] At present, common lift trucks use hydraulic devices to raise and lower the lifting platform, thereby achieving the purpose of lifting goods. Since the hydraulic device has high requirements for sealing, the piston, sealing ring and other parts are prone to wear after long-term use. At the same time, impurities in the hydraulic oil will also cause damage to various components, resulting in high maintenance costs in the later stage. Utility Model Content

[0003] In view of the shortcomings of the background technology, the purpose of the utility model is to provide a lifting vehicle with self-locking function.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A self-locking lifting vehicle comprises a base and a lifting platform, wherein the base is provided with a column guide rail, and one side of the lifting platform is provided with a movable part that is rollingly adapted to the column guide rail; the driving device also comprises a worm wheel and a worm that are mutually transmission-coordinated, the worm being used for transmission connection with an external driving force, the worm wheel being connected to the movable part through a traction rope, and the lifting platform is driven to rise or fall by rotating the worm wheel to reel in or release the traction rope, and the lead angle of the worm is smaller than the equivalent friction angle between the meshing gear teeth of the worm wheel and the worm, so that the worm wheel cannot drive the worm.

[0006] Furthermore, the column guide rail includes a first column guide rail and a second column guide rail, the first column guide rail and the second column guide rail are respectively arranged on both sides of the base, and the movable part includes a first movable part and a second movable part respectively adapted to the first column guide rail and the second column guide rail.

[0007] Furthermore, the worm wheel is provided with a coaxially arranged rope wheel, and the rope wheel is provided with a first wire taking-up groove and a second wire taking-up groove, and the first wire taking-up groove and the second wire taking-up groove are respectively provided with a first traction rope and a second traction rope, and the first traction rope and the second traction rope are respectively connected to the first movable part and the second movable part.

[0008] Furthermore, the first column guide rail and the second column guide rail are respectively provided with a first adjusting device and a second adjusting device at the top, and the first adjusting device and the second adjusting device are respectively provided with a first movable pulley and a second movable pulley which can be raised and lowered along the axis of the first column guide rail and the second column guide rail respectively, and the first traction rope and the second traction rope are respectively connected to the first movable part and the second movable part after passing around the first movable pulley and the second movable pulley.

[0009] Furthermore, the first adjustment device and the second adjustment device respectively include a first screw rod and a second screw rod threadably adapted to the first column guide rail and the second column guide rail, and one end of the first screw rod and the second screw rod located in the first column guide rail and the second column guide rail are respectively connected to the first movable pulley and the second movable pulley.

[0010] Furthermore, the base is provided with a first fixed pulley and a second fixed pulley, and the second traction rope is connected to the second movable part after passing around the first fixed pulley, the second fixed pulley and the second movable pulley in sequence.

[0011] Furthermore, the driving device also includes an input part, one end of the input part is gear-engaged and transmission-connected to the worm, the other end of the input part is transmission-connected to an external driving force, and the transmission ratio between the input part and the worm is less than 1.

[0012] Furthermore, it also includes a wrench that is transmission-matched with the other end of the input part, and the base is provided with a clamping seat for clamping the wrench.

[0013] Furthermore, lifting rings are respectively provided on the tops of the first column guide rail and the second column guide rail.

[0014] Furthermore, rollers and a lifter are provided at the bottom of the base. When the lifter is extended and abuts the ground so that at least part of the roller is detached from the ground, the base is in a fixed state. When the lifter is retracted and detached from the ground, the roller abuts the ground and the base is in a movable state.

[0015] The beneficial effects of the utility model are:

[0016] 1. The utility model proposes a self-locking lifting vehicle, whose driving device includes a worm wheel and a worm that are mutually driven and matched. The worm is used to transmit and connect the external driving force. The worm wheel is connected to the movable part through a traction rope. The lifting platform is driven to rise or fall by rotating the worm wheel to reel in or release the traction rope, and the lead angle of the worm is smaller than the equivalent friction angle between the meshing gear teeth of the worm wheel and the worm. Therefore, the worm wheel can only be driven by the worm, and the worm wheel cannot drive the worm to rotate, so that the self-locking of the driving device is realized when the worm wheel reverses, ensuring that the lifting platform will not fall when the worm stops rotating, avoiding equipment damage and personal injury.

[0017] 2. The utility model proposes a self-locking lifting vehicle, which adjusts the height difference on both sides of the lifting platform by adjusting the height of the first movable pulley and the second movable pulley to adapt to the uneven ground on the work site, so that the lifting platform is always in a horizontal state during the lifting process, thereby ensuring the safety of the equipment during the lifting process.

[0018] 3. The utility model provides a self-locking lifting vehicle, in which the transmission ratio between the input part and the worm is less than 1, so that the operator can easily rotate the input part.

[0019] 4. The utility model provides a self-locking lifting vehicle, wherein the tops of the first column guide rail and the second column guide rail are respectively provided with lifting rings, so as to facilitate the lifting of the lifting vehicle by the lifting equipment.

[0020] 5. The utility model proposes a self-locking lifting vehicle, wherein rollers and a lifting device are provided at the bottom of the base. By extending or retracting the lifting device, the rollers are separated from or abutted against the ground, so that the base is switched between a fixed state and a movable state, which is convenient for manual operation to move the lifting vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 This is one of the schematic diagrams of a self-locking lifting vehicle of the utility model;

[0023] Figure 2 This is the second schematic diagram of a self-locking lift truck of the utility model;

[0024] Figure 3 It is a schematic diagram of a lifting platform with a self-locking lifting vehicle of the utility model;

[0025] Figure 4 It is a schematic diagram of a base of a self-locking lifting vehicle of the utility model;

[0026] Figure 5 This is a schematic diagram of a driving device of a self-locking lifting vehicle of the utility model;

[0027] Figure 6 for Figure 2 A partial enlarged schematic diagram in the middle;

[0028] Figure 7 for Figure 2 A partial enlarged schematic diagram of point B in the middle;

[0029] Figure 8 for Figure 4 A partial enlarged schematic diagram of point C in the middle;

[0030] In the figure, 10, base; 20, lifting platform; 30, driving device; 301, worm gear; 302, worm; 401, first column guide rail; 402, second column guide rail; 501, first movable part; 502, second movable part; 60, rope pulley; 601, first wire taking-up groove; 602, second wire taking-up groove; 701, first traction rope; 702, second traction rope; 801, first screw rod; 802, first movable pulley; 803, first toggle rod; 901, second screw rod; 902, second movable pulley; 903, second toggle rod; 1001, first fixed pulley; 1002, second fixed pulley; 110, wrench; 120, clamping seat; 130, lifting ring; 140, lifting device; 150, ordinary roller; 160, input part. DETAILED DESCRIPTION

[0031] Combine the following Figure 1-8 The utility model is described in detail.

[0032] A self-locking lifting vehicle comprises a base 10 and a lifting platform 20, wherein the base 10 is provided with a column guide rail, and one side of the lifting platform 20 is provided with a movable part rollingly adapted to the column guide rail; and further comprises a driving device 30, wherein the driving device 30 comprises a worm wheel 301 and a worm 302 which are mutually transmission-coordinated, wherein the worm 302 is used for transmission connection with an external driving force, and the worm wheel 301 is connected to the movable part through a traction rope, and the lifting platform 20 is driven to rise or fall by rotating the worm wheel 301 to reel in or release the traction rope, and the lead angle of the worm 302 is smaller than the equivalent friction angle between the meshing gear teeth between the worm wheel 301 and the worm 302, so that the worm wheel 301 cannot drive the worm 302. Therefore, the worm wheel 301 can only be driven to rotate by the worm 302, and the worm wheel 301 cannot drive the worm 302 to rotate, so that the self-locking of the driving device 30 is realized when the worm wheel 301 is reversed, so as to ensure that the lifting platform 20 will not fall when the worm 302 stops rotating, thereby avoiding equipment damage and personal injury.

[0033] In this embodiment, the column guide includes a first column guide 401 and a second column guide 402, and the first column guide 401 and the second column guide 402 are respectively arranged on both sides of the base 10, and the movable part includes a first movable part 501 and a second movable part 502 respectively adapted to the first column guide 401 and the second column guide 402.

[0034] In this embodiment, the worm wheel 301 is provided with a coaxially arranged rope wheel 60, and the rope wheel 60 is provided with a first wire taking-up groove 601 and a second wire taking-up groove 602. The first wire taking-up groove 601 and the second wire taking-up groove 602 are respectively provided with a first traction rope 701 and a second traction rope 702. The first traction rope 701 and the second traction rope 702 are respectively connected to the first movable part 501 and the second movable part 502.

[0035] In this embodiment, the first column guide rail 401 and the second column guide rail 402 are respectively provided with a first adjusting device and a second adjusting device, and the first adjusting device and the second adjusting device are respectively provided with a first movable pulley 802 and a second movable pulley 902 which can be raised and lowered along the axial direction of the first column guide rail 401 and the second column guide rail 402, respectively, and the first traction rope 701 and the second traction rope 702 are connected to the first movable part 501 and the second movable part 502 after passing through the first movable pulley 802 and the second movable pulley 902 respectively. Further, the base 10 is provided with a first fixed pulley 1001 and a second fixed pulley 1002, and the second traction rope 702 is connected to the second movable part 502 after passing through the first fixed pulley 1001, the second fixed pulley 1002 and the second movable pulley 902 in sequence.

[0036] In this embodiment, the first adjusting device and the second adjusting device respectively include a first screw rod 801 and a second screw rod 901 threadedly adapted to the first column guide rail 401 and the second column guide rail 402, and one end of the first screw rod 801 and the second screw rod 901 located in the first column guide rail 401 and the second column guide rail 402 is respectively connected to the first movable pulley 802 and the second movable pulley 902. When in use, the height of the first movable pulley 802 and the second movable pulley 902 is adjusted by the first screw rod 801 and the second screw rod 901, and then the height difference on both sides of the lifting platform 20 is adjusted to adapt to the uneven ground at the site, so that the lifting platform 20 is always in a horizontal state during the lifting process, ensuring the safety of the equipment during the lifting process. Further, the first screw rod 801 and the second screw rod 901 are respectively provided with a first toggle rod 803 and a second toggle rod 903 on the outside, so that the operator can rotate the first screw rod 801 and the second screw rod 901 through the first toggle rod 803 and the second toggle rod 903.

[0037] In this embodiment, the driving device 30 also includes an input part 160, one end of the input part 160 is gear-engaged and connected to the worm 302, and the other end of the input part 160 is connected to the external driving force, and the transmission ratio between the input part 160 and the worm 302 is less than 1, which is convenient for the operator to rotate the input part 160.

[0038] In this embodiment, a wrench 110 is further included which is transmission-matched with the other end of the input portion 160 . The base 10 is provided with a clamping seat 120 for clamping the wrench 110 , so as to avoid the loss of the wrench 110 due to the lack of a relevant storage device on the lifting vehicle.

[0039] In this embodiment, a lifting ring 130 is respectively provided on the top of the first column guide rail 401 and the second column guide rail 402 to facilitate the lifting of the lifting vehicle by the lifting equipment.

[0040] In this embodiment, rollers and a lifter 140 are provided at the bottom of the base 10. By extending or retracting the lifter 140, the rollers are separated from or abutted against the ground, so that the base 10 is switched between a fixed state and a movable state, which is convenient for manual operation to carry the lift vehicle. Specifically, when the lifter 140 is extended and abutted against the ground so that at least part of the rollers are separated from the ground, the base 10 is in a fixed state. When the lifter 140 is retracted and separated from the ground, the rollers abut against the ground, and the base 10 is in a movable state. Further, the rollers include universal wheels (not shown) and ordinary rollers 150. The ordinary rollers 150 are provided at the front end of the base 10, and the lifter 140 and the universal wheels are provided at the rear end of the base 10.

[0041] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable those skilled in the art to understand the content of the utility model and implement it, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A self-locking lift truck, characterized in that: It includes a base and a lifting platform, the base is provided with a column guide rail, and one side of the lifting platform is provided with a movable part that is rollingly adapted to the column guide rail; it also includes a driving device, the driving device includes a worm wheel and a worm that cooperate with each other, the worm is used to transmit and connect an external driving force, the worm wheel is connected to the movable part through a traction rope, and the lifting platform is driven to rise or fall by rotating the worm wheel to reel in or release the traction rope, and the lead angle of the worm is smaller than the equivalent friction angle between the meshing gear teeth of the worm wheel and the worm, so that the worm wheel cannot drive the worm.

2. A self-locking lift truck as claimed in claim 1, characterized in that: The column guide rail includes a first column guide rail and a second column guide rail, the first column guide rail and the second column guide rail are respectively arranged on both sides of the base, and the movable part includes a first movable part and a second movable part respectively adapted to the first column guide rail and the second column guide rail.

3. A self-locking lift truck as claimed in claim 2, characterized in that: The worm wheel is provided with a coaxially arranged rope wheel, and the rope wheel is provided with a first wire taking-up groove and a second wire taking-up groove, and the first wire taking-up groove and the second wire taking-up groove are respectively provided with a first traction rope and a second traction rope, and the first traction rope and the second traction rope are respectively connected to the first movable part and the second movable part.

4. A self-locking lift truck as claimed in claim 3, characterized in that: The first column guide rail and the second column guide rail are respectively provided with a first adjusting device and a second adjusting device at the top, and the first adjusting device and the second adjusting device are respectively provided with a first movable pulley and a second movable pulley which can be raised and lowered along the axis of the first column guide rail and the second column guide rail respectively, and the first traction rope and the second traction rope are connected to the first movable part and the second movable part after passing through the first movable pulley and the second movable pulley respectively.

5. A self-locking lift truck as claimed in claim 4, characterized in that: The first adjusting device and the second adjusting device respectively include a first screw rod and a second screw rod threadedly adapted to the first column guide rail and the second column guide rail, and one end of the first screw rod and the second screw rod located in the first column guide rail and the second column guide rail are respectively connected to the first movable pulley and the second movable pulley.

6. A self-locking lift truck as claimed in claim 4, characterized in that: The base is provided with a first fixed pulley and a second fixed pulley, and the second traction rope is connected to the second movable part after winding around the first fixed pulley, the second fixed pulley and the second movable pulley in sequence.

7. A self-locking lift truck as claimed in claim 2, characterized in that: The driving device also includes an input part, one end of the input part is gear-engaged and transmission-connected to the worm, the other end of the input part is transmission-connected to an external driving force, and the transmission ratio between the input part and the worm is less than 1.

8. A self-locking lift truck as claimed in claim 7, characterized in that: It also includes a wrench that is transmission-matched with the other end of the input part, and the base is provided with a clamping seat for clamping the wrench.

9. A self-locking lift truck as claimed in claim 2, characterized in that: Lifting rings are respectively provided on the tops of the first column guide rail and the second column guide rail.

10. A self-locking lift truck as claimed in claim 1, characterized in that: A roller and a lifter are provided at the bottom of the base. When the lifter is extended and abuts against the ground so that at least part of the roller is detached from the ground, the base is in a fixed state. When the lifter is retracted and detached from the ground, the roller abuts against the ground and the base is in a movable state.

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