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Abstract

The utility model discloses a carrier truck relates to carrier truck technical field. Carrier truck includes frame, lifting module and drive module, is provided first wheel group and second wheel group through in frame and lifting module respectively, when first wheel group and ground contact or and the track of goods shelf contact, carrier truck can move along left and right direction. Since drive module passes through lifting motor output power, after the deceleration through deceleration component, power transmission to worm, worm drives worm wheel and swing arm rotation, swing arm drives lifting module lifting again. Since drive module adopts the mode of worm wheel and worm transmission power, and worm wheel and worm have the function of self -locking, even if lifting motor stop rotation can also lock the height of lifting module under the self -locking of worm wheel and worm, therefore, lifting motor can cancel the structure of clutching brake, to reduce the cost of lifting motor, improve the service life of lifting motor.

Description

Technical Field

[0001] This utility model relates to the field of transport vehicle technology, and in particular to a transport vehicle. Background Technology

[0002] In warehousing and logistics systems, pallet trucks have always been the mainstream equipment for transporting heavy-duty pallets. Pallet trucks can move forward and backward and left and right within the racking tracks, and they are also equipped with lifting mechanisms to lift goods, thus delivering them to different locations on the racking or moving items from the racking to a designated location. Traditional pallet trucks rely on the brake of the lifting motor to lock the goods in place after lifting them, which causes severe wear on the brake, affecting the lifespan of the lifting motor and resulting in low reliability. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a transport vehicle that employs a worm gear and worm drive system. The worm gear and worm have a self-locking function, which can reduce motor losses.

[0004] The transport vehicle according to an embodiment of the present utility model includes: a frame, with first wheel sets respectively provided at both ends along the front-rear direction; The lifting module has a second wheel set at each end along the left and right directions; A drive module, mounted on the vehicle frame, includes a lifting motor, a reduction gear assembly, and an output assembly. The output assembly includes a worm gear, a worm, and a swing arm. The lifting motor is driven to the input end of the reduction gear assembly, and the output end of the reduction gear assembly is driven to the worm. The worm meshes with the worm gear, the worm gear is fixedly connected to the swing arm, and the swing arm is driven to the lifting module. The swing arm is configured to swing under the drive of the worm gear to drive the lifting module to rise or fall.

[0005] The transport vehicle according to the embodiments of this utility model has at least the following beneficial effects: By setting a first wheel set and a second wheel set in the frame and lifting module respectively, the transport vehicle can move left and right when the first wheel set is in contact with the ground or the shelf track. Since the drive module outputs power through the lifting motor, after being reduced in speed by the reduction assembly, the power is transmitted to the worm gear. The worm gear drives the worm wheel and the swing arm to rotate, and the swing arm then drives the lifting module to rise and fall. When the lifting module adjusts the position of the second wheel set under the drive module, so that the second wheel set is in contact with the ground or the shelf track, and the first wheel set is suspended, the transport vehicle can move forward and backward. Because the drive module uses a worm gear and worm wheel to transmit power, and the worm gear and worm wheel have a self-locking function, even if the lifting motor stops, the height of the lifting module can be locked by the self-locking of the worm gear and worm wheel. Therefore, the lifting motor can eliminate the need for a brake device, reducing the cost of the lifting motor and increasing its service life. In other embodiments, the lifting motor can also be equipped with a brake structure, providing double protection with the self-locking of the worm gear and worm wheel, which can also reduce brake wear and improve the service life and reliability of the lifting motor.

[0006] According to some embodiments of the present invention, the lifting module includes a mounting plate, the mounting plate having a strip-shaped hole extending along the front-rear direction, one end of the swing arm being disposed within the strip-shaped hole and capable of moving within the strip-shaped hole to drive the lifting module to rise or fall.

[0007] According to some embodiments of the present invention, the lifting module includes two plate groups spaced apart in the left-right direction, each plate group having two mounting plates spaced apart in the front-back direction, the deceleration assembly including a dual-output reducer, the dual-output reducer having an output shaft protruding from both ends of the dual-output reducer in the front-back direction, the output assembly having two components and being driven connected to both ends of the output shaft respectively, one end of the swing arm of the two output components being respectively disposed in the strip hole of the corresponding mounting plate, the two swing arms being configured to swing synchronously in opposite directions.

[0008] According to some embodiments of the present invention, the two side walls of the strip hole along the front-back direction are respectively constructed as a first arc-shaped surface and a second arc-shaped surface, and the two side walls of the strip hole along the up-down direction are respectively constructed as a first plane and a second plane. The first plane is located above the second plane. The first arc-shaped surface and the second arc-shaped surface are respectively connected to the two ends of the second plane along the front-back direction. The first arc-shaped surface and the first plane are connected by a third arc-shaped surface, and the second arc-shaped surface and the first plane are connected by a fourth arc-shaped surface. Along the up-down direction, the third arc-shaped surface and the fourth arc-shaped surface protrude upward from the first plane. The lifting module has sequentially increasing heights of a first height, a second height, and a third height. When the lifting module is at the first height, the first wheel set is suspended, and the second wheel set is configured to drive the transport vehicle to move in the forward-backward direction, with one end of the swing arm abutting against the third arc-shaped surface. When the lifting module is at the second height, the first wheel set is configured to drive the transport vehicle to move in the left-right direction, and the second wheel set is suspended, with one end of the swing arm located between the third arc-shaped surface and the fourth arc-shaped surface. When the lifting module is at the third height, one end of the swing arm abuts against the fourth arc-shaped surface.

[0009] According to some embodiments of the present invention, the swing arm includes a rod and a bearing. The rod is driven to the worm gear. The rod is provided with a connecting post spaced apart from the rotation center of the rod. The connecting post is fixedly connected to the inner ring of the bearing. The outer ring of the bearing is fitted with the wall of the strip hole.

[0010] According to some embodiments of the present invention, the drive module is provided in two parts and is installed on the frame along the left-right direction. The two drive modules are used together to drive the lifting module to rise or fall.

[0011] According to some embodiments of the present invention, the lifting module includes two plate groups and two connecting rods. The two plate groups are spaced apart in the left-right direction and are respectively connected to the second wheel group. The two connecting rods are spaced apart in the front-back direction and are fixedly connected to the two plate groups.

[0012] According to some embodiments of the present invention, the drive module further includes at least two guide plates spaced apart in the front-rear direction. Each guide plate has a guide groove extending in the up-down direction, and the guide grooves of the two guide plates are respectively guided and engaged with a connecting rod.

[0013] According to some embodiments of the present invention, the plate assembly includes two mounting plates spaced apart in the front-back direction, and the guide plate is provided with a limiting groove extending in the up-down direction on one side facing the other guide plate, and the two limiting grooves respectively limit and cooperate with the two corresponding mounting plates.

[0014] According to some embodiments of the present invention, the deceleration assembly includes a dual-output reducer, the dual-output reducer having an output shaft protruding from both ends of the dual-output reducer along the front-rear direction, the output assembly having two output components and being driven connected to both ends of the output shaft respectively, the output assembly further including an output box, the output box having the worm gear and the worm, two guide plates respectively correspondingly connected to the side of the output box opposite to the other output box, the guide plate having one of a first protrusion and a first groove on the side facing the output box, the output box having the other of the first protrusion and the first groove on the side facing the guide plate, the first protrusion and the first groove being positioned and engaged, and the output box and the guide plate being connected by fasteners.

[0015] According to some embodiments of the present invention, the deceleration assembly includes a reversing gearbox, which contains a gear set. The output assembly further includes an output box, which contains the worm gear and the worm. The worm and the gear set are drivenly connected. The reversing gearbox has one of a second protrusion and a second groove on its side facing the output box. The output box has the other of the second protrusion and the second groove on its side facing the reversing gearbox. The second protrusion and the second groove are positioned and engaged. The output box and the reversing gearbox are connected by fasteners.

[0016] According to some embodiments of the present invention, the deceleration assembly includes a planetary reducer, a dual-output reducer, and two reversing gearboxes. The output assembly has two components. The input end of the planetary reducer is connected to the output end of the lifting motor. The output end of the planetary reducer is connected to the input end of the dual-output reducer. The two output ends of the dual-output reducer are respectively connected to the input ends of the two reversing gearboxes. The output ends of the two reversing gearboxes are respectively connected to the worm gears of the two output assemblies.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of the structure of a transport vehicle according to an embodiment of the present invention; Figure 2 This is an exploded view of a transport vehicle according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of the transport vehicle after the outer shell is hidden, according to one embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of a drive module according to an embodiment of the present invention; Figure 5 This is an exploded view of a driving module according to an embodiment of the present invention; Figure 6 This is an exploded view of the hidden portion of the drive module structure according to one embodiment of this utility model; Figure 7 This is an exploded view of the hidden portion of the drive module structure according to one embodiment of this utility model; Figure 8 This is a schematic diagram of the structure of the mounting plate and the swing arm in one embodiment of the present invention; Figure 9 This is a schematic diagram of the structure of the mounting plate according to one embodiment of the present invention; Figure 10 This is a front view of a driving module according to an embodiment of the present invention; Figure 11 yes Figure 3 Enlarged view of point A in the middle.

[0019] Figure label: 1000 pallet trucks; Frame 100; First wheelset 110; Body shell 120; Lifting module 200; second wheel assembly 210; plate assembly 220; mounting plate 230; strip hole 231; first arc surface 232; second arc surface 233; third arc surface 234; fourth arc surface 235; first plane 236; second plane 237; connecting rod 240; Drive module 300; lifting motor 310; Reduction assembly 320; Dual output reducer 321; Output shaft 3211; Reversing gearbox 322; Second protrusion 3221; Input gear 3222; Output gear 3223; Planetary reducer 323; Bracket 324; Output component 330; worm gear 331; worm 332; swing arm 333; rod 3331; connecting column 3332; bearing 3333; output box 334; first groove 3341; second groove 3342; guide plate 340; guide groove 341; limiting groove 342; first protrusion 343. Detailed Implementation

[0020] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0021] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0023] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0024] Reference Figure 1 , Figure 2 and Figure 3 As shown, a transport vehicle 1000 according to one embodiment of the present invention can be used in a warehousing and logistics system to transport goods. For example, the transport vehicle 1000 can run on the rails of a shelf or on the ground. The transport vehicle 1000 can be a shuttle, such as a four-way shuttle. The transport vehicle 1000 of this embodiment includes a housing 120, a frame 100, a lifting module 200, and a drive module 300. The frame 100 has first wheel sets 110 at both ends along the front-rear direction. The housing 120 covers the upper end of the bracket 324 and is fixedly connected to the frame 100. (Refer to...) Figure 2 As shown, the lifting module 200 has second wheel sets 210 at both ends along the left and right directions, perpendicular to the front and back directions. (Refer to...) Figure 4 , Figure 5 and Figure 6 As shown, the drive module 300 is mounted on the frame 100. The drive module 300 includes a lifting motor 310, a reduction assembly 320, and an output assembly 330. The output assembly 330 includes a worm gear 331, a worm 332, and a swing arm 333. The lifting motor 310 is driven to the input end of the reduction assembly 320, and the output end of the reduction assembly 320 is driven to the worm 332. The worm 332 meshes with the worm gear 331, and the worm gear 331 is fixedly connected to the swing arm 333. The swing arm 333 is driven to the lifting module 200. The swing arm 333 is configured to swing under the drive of the worm gear 331 to drive the lifting module 200 to rise or fall.

[0025] The frame 100 can be understood as the basic structure used to support and install other functional modules. Its specific form can be a frame structure, a flat plate structure, or other rigid structures suitable for load-bearing. The first wheel set 110 can be configured through axle connection, suspension device, or sliding rail cooperation, and its main function is to provide support for movement in the left-right direction. The first wheel set 110 and the second wheel set 210 can be implemented as omnidirectional wheels, directional wheels, or track wheels, the selection depending on the needs of the actual operating environment. For example, the rack has main rails and sub-rails, with the sub-rails extending in the left-right direction and the main rail extending in the front-back direction. The first wheel set 110 can run on the sub-rails, while the second wheel set 210 can run on the main rail.

[0026] The lifting module 200 is designed to achieve height adjustment, and the height adjustment range and accuracy can be improved by adding limit switches, sensors, or mechanical stops. The drive module 300, as the core power unit, can be implemented using various transmission methods. For example, the reduction assembly 320 can use a gear reducer, belt drive, or chain drive, its main function being to convert the high-speed, low-torque output of the lifting motor 310 into a low-speed, high-torque output. The meshing of the worm gear 331 and worm 332 in the output assembly 330 can be a single-start worm 332, a multi-start worm 332, or a variable-tooth-thickness worm 332, ensuring the reliability of the self-locking function. By designing the lead angle of the worm 332 to be smaller than the equivalent friction angle of the meshing worm gear 331, the worm gear 331 cannot drive the worm 332 by its own rotation; instead, the worm gear 332 drives the worm gear 331, thus achieving the self-locking function. The drive connection of the swing arm 333 can be a hinge structure, a slider structure or a crank-connecting rod mechanism. Its main function is to convert the rotational motion into the linear motion of the lifting module 200.

[0027] By setting a first wheel set 110 and a second wheel set 210 on the frame 100 and the lifting module 200 respectively, the transport vehicle 1000 can move in the left and right directions when the first wheel set 110 is in contact with the ground or the shelf track. Since the drive module 300 outputs power through the lifting motor 310, and after being reduced in speed by the reduction assembly 320, the power is transmitted to the worm gear 332. The worm gear 332 drives the worm wheel 331 and the swing arm 333 to rotate, and the swing arm 333 then drives the lifting module 200 to rise and fall. When the lifting module 200 adjusts the position of the second wheel set 210 under the drive of the drive module 300, so that the second wheel set 210 is in contact with the ground or the shelf track, and the first wheel set 110 is in a suspended state, the transport vehicle 1000 can move in the front and back directions. Because the drive module 300 transmits power using a worm gear 331 and a worm 332, and the worm gear 331 and worm 332 have a self-locking function, even if the lifting motor 310 stops, the height of the lifting module 200 can be locked by the self-locking of the worm gear 331 and worm 332. Therefore, the lifting motor 310 can eliminate the need for a brake, thereby reducing the cost of the lifting motor 310 and increasing its service life. Of course, the lifting motor 310 can also be equipped with a brake function, which, together with the self-locking of the worm gear 331 and worm 332, provides double protection, reduces wear on the brake, and improves the service life and reliability of the lifting motor 310.

[0028] Reference Figure 2 , Figure 5 and Figure 8 As shown in the embodiment of this utility model, the lifting module 200 of the transport vehicle 1000 includes a mounting plate 230. The mounting plate 230 has a strip-shaped hole 231 extending in the front-rear direction. One end of the swing arm 333 is disposed in the strip-shaped hole 231 and can move within the strip-shaped hole 231 to drive the lifting module 200 to rise or fall. "Movement" refers to the ability of one end of the swing arm 333 to move and rotate within the strip-shaped hole 231. The lifting motor 310 can rotate forward or backward, thereby driving the swing arm 333 to swing in different directions, allowing the lifting module 200 to rise or fall.

[0029] The strip-shaped hole 231 can be understood as an elongated hole structure extending in the front-to-back direction, allowing the end of the swing arm 333 to slide within it, thereby absorbing the horizontal component force generated by the movement of the swing arm 333. The mechanism that allows one end of the swing arm 333 to rotate and move within the strip-shaped hole 231 converts the rotational motion of the swing arm 333 into sliding along the strip-shaped hole 231, ensuring that the vertical displacement of the lifting module 200 is not disturbed by horizontal forces.

[0030] By adopting the above solution, a strip-shaped hole 231 extending in the front-to-back direction is provided on the mounting plate 230, allowing the end of the swing arm 333 to slide freely in the front-to-back direction when it swings under the drive of the worm gear 331. This absorbs the horizontal component force generated by the movement of the swing arm 333 and prevents the horizontal force from being transmitted to the lifting module 200 body. The mechanism of one end of the swing arm 333 rotating and moving within the strip-shaped hole 231, by converting the rotational motion of the swing arm 333 into sliding along the strip-shaped hole 231, ensures that the vertical displacement of the lifting module 200 is not disturbed by the horizontal, achieves a smooth transition of power transmission, improves the stability of the lifting module 200 during height switching, and provides reliable operation guarantee for the transport vehicle 1000 during track switching.

[0031] Reference Figure 5 and Figure 8 As shown in the embodiment of this utility model, the swing arm 333 includes a rod 3331 and a bearing 3333. The rod 3331 and the worm gear 331 are driven to connect. The rod 3331 is provided with a connecting post 3332 on the side facing the mounting plate 230, which is spaced apart from the rotation center of the rod 3331. The connecting post 3332 is fixedly connected to the inner ring of the bearing 3333. The outer ring of the bearing 3333 is provided in the strip hole 231, and the outer ring of the bearing 3333 and the hole wall of the strip hole 231 are in abutment fit.

[0032] The rod 3331 refers to the part of the swing arm 333 that connects to the worm gear 331. Its main function is to transmit power from the worm gear 331 to the overall structure of the swing arm 333. In practical applications, the rod 3331 can achieve a drive connection with the worm gear 331 through keyway fitting, threaded connection, or welding to ensure the stability of power transmission. The bearing 3333 can convert the original sliding friction into rolling friction, thereby reducing the coefficient of friction and wear rate of the contact surface, and improving the durability and smooth operation of the equipment.

[0033] With the above solution, the swing arm 333 is driven by the worm gear 331 through the rod 3331, ensuring that power is stably transmitted from the worm gear 331 to the swing arm 333. When the swing arm 333 swings, the outer ring of the bearing 3333 rolls rather than slides in the slot 231, effectively reducing wear during movement and improving the service life of the swing arm 333.

[0034] It should be noted that, in another embodiment, the bearing 3333 can also be replaced with a roller, and the appropriate solution can be selected according to the actual situation.

[0035] Reference Figure 2 and Figure 10As shown in the embodiment of this utility model, the lifting module 200 of the transport vehicle 1000 includes two plate groups 220 spaced apart in the left-right direction. Each plate group 220 has two mounting plates 230 spaced apart in the front-back direction. The reduction assembly 320 includes a dual-output reducer 321, which has an output shaft 3211 protruding from both ends in the front-back direction. Two output components 330 are provided and are respectively driven connected to both ends of the output shaft 3211. One end of each swing arm 333 of the two output components 330 is respectively located in the slotted hole 231 of the corresponding mounting plate 230. The two swing arms 333 are configured to swing synchronously in opposite directions. In other embodiments, the swing directions of the two swing arms 333 may be the same; the following explanation will use opposite swing directions as an example.

[0036] By adopting the above scheme, two mounting plates 230 arranged at intervals along the front-rear direction are set in the plate group 220 of the lifting module 200, effectively avoiding the problem of uneven torque distribution when supported at a single point. The strip-shaped holes 231 on each mounting plate 230 extend along the front-rear direction. This design not only constrains the movement trajectory of the ends of the swing arms 333, but also ensures that the swing arms 333 can only slide in a predetermined direction during lifting, thus limiting the degrees of freedom of the lifting module 200 in the front-rear direction. The two output shafts 3211 of the dual-output reducer 321, located at both ends along the front-rear direction, are connected to the two output components 330 through a one-to-one connection. This direct-drive connection method ensures precise synchronization of power transmission and eliminates phase deviation caused by differences in the transmission chain. When the lifting motor 310 starts, the dual-output reducer 321 drives the two swing arms 333 to rotate at the same angular velocity but in opposite directions, so that the forward horizontal component generated by one swing arm 333 is equal in magnitude and opposite in direction to the backward horizontal component generated by the other. For example... Figure 10 As shown, one swing arm 333 rotates counterclockwise, and the other swing arm 333 rotates clockwise. Therefore, the two can cancel out the horizontal component force on the lifting module 200, so that the lifting module 200 will not swing in the back-and-forth direction, reducing the shaking of the transport vehicle 1000 and improving the smoothness of operation.

[0037] Reference Figure 8 and Figure 9As shown in the embodiment of this utility model, the two side walls of the strip hole 231 along the front-back direction are respectively constructed as a first arc-shaped surface 232 and a second arc-shaped surface 233, and the two side walls of the strip hole 231 along the up-down direction are respectively constructed as a first plane 236 and a second plane 237. The first plane 236 is located above the second plane 237. The first arc-shaped surface 232 and the second arc-shaped surface 233 are respectively connected to the two ends of the second plane 237 along the front-back direction. The first arc-shaped surface 232 and the first plane 236 are connected by a third arc-shaped surface 234, and the second arc-shaped surface 233 and the first plane 236 are connected by a fourth arc-shaped surface 235. Along the up-down direction, the third arc-shaped surface 234 and the fourth arc-shaped surface 235 protrude upward from the first plane 236.

[0038] The lifting module 200 has sequentially increasing heights to a first height, a second height, and a third height. When the lifting module 200 is at the first height, the first wheel set 110 is suspended in the air, meaning it is separated from the ground or the shelf track surface. The second wheel set 210 is in contact with the support surface, which is the ground or shelf track surface. Therefore, the second wheel set 210 can drive the transport vehicle 1000 to move in the back-and-forth direction. At this time, one end of the swing arm 333 is engaged with the third arc-shaped surface 234 to ensure that the lifting module 200 can be stably positioned at the first height. Figure 8 The dashed circle in the diagram represents the state when the outer ring of bearing 3333 abuts against the third arc-shaped surface 234. When the lifting module 200 is at the second height, the first wheel set 110 is in contact with the support surface, while the second wheel set 210 is suspended. At this time, the first wheel set 110 can drive the transport vehicle 1000 to move in the left and right directions. One end of the swing arm 333 is located between the third arc-shaped surface 234 and the fourth arc-shaped surface 235. When the lifting module 200 is at the third height, one end of the swing arm 333 is engaged with the fourth arc-shaped surface 235 to ensure that the lifting module 200 can be stably maintained at the third height.

[0039] The first arc-shaped surface 232 and the second arc-shaped surface 233 refer to the arc-shaped surface of one side of the slot hole 231 along the front-to-back direction. These can be implemented using a circular or elliptical arc surface, matching the shape of the swing arm 333 to form a naturally embedded locking point, thus limiting horizontal displacement. The first plane 236 and the second plane 237 refer to the flat surface of one side of the slot hole 231 along the vertical direction, providing a stable sliding guide surface for the swing arm 333. The third arc-shaped surface 234 refers to the arc-shaped transition surface connecting the first arc-shaped surface 232 and the first plane 236. This can be implemented using a high-convex arc surface or a circular arc surface, enhancing the locking strength and preventing accidental descent of the lifting module 200. The fourth arc-shaped surface 235 refers to the arc-shaped transition surface connecting the second arc-shaped surface 233 and the first plane 236. This can also be implemented using a high-convex arc surface or a circular arc surface, providing reliable mechanical locking and limiting excessive rising or falling of the lifting module 200. The supporting surface refers to the ground, or the surface where the main track, sub-track, and first wheel group 110 or second wheel group 210 come into contact.

[0040] When the lifting module 200 is at the first height, one end of the swing arm 333 abuts against the third arc-shaped surface 234. At this time, the rollers or bearings 3333 of the swing arm 333 are embedded in the recess formed by the third arc-shaped surface 234. In this state, the second wheel set 210 extends downward and contacts the support surface (such as the sub-rail), the first wheel set 110 separates from the support surface, and the transport vehicle 1000 runs on the second wheel set 210. Because the end of the swing arm 333 is engaged with the third arc-shaped surface 234, a mechanical self-locking mechanism is formed. Combined with the self-locking characteristics of the worm gear 331 and worm 332, it can ensure that the lifting module 200 is stably maintained at the first height under heavy load, preventing accidental descent due to vibration or power failure, and improving the safety of equipment operation.

[0041] When the drive module 300 drives the swing arm 333 to rotate, causing the lifting module 200 to reach the second height, one end of the swing arm 333 is located between the third arc surface 234 and the fourth arc surface 235, and moves within the space defined by the first plane 236 and the second plane 237. This process is the reversal transition stage, where the first wheel set 110 contacts the support surface (such as the main track), and the second wheel set 210 gradually detaches from the support surface.

[0042] When the lifting module 200 is at the third height, one end of the swing arm 333 abuts against the fourth arc-shaped surface 235. At this time, the first wheel set 110 fully bears the weight of the vehicle body, and the second wheel set 210 retracts. The fourth arc-shaped surface 235 also acts as a positioning dead point, locking the swing arm 333 at a specific angle to ensure that the lifting module 200 is stable at the third height. This double locking structure of worm gear 331 and worm 332 self-locking and track groove positioning provides a guarantee for the stability of the transport vehicle 1000 during operation.

[0043] It should be noted that when there are two drive modules 300, there are also two swing arms 333 with opposite swing directions. Therefore, the mounting plates 230 that cooperate with the two swing arms 333 are symmetrically arranged in the left and right directions, and the strip holes 231 of the two mounting plates 230 are also symmetrically arranged in the left and right directions.

[0044] Reference Figure 3 and Figure 4 As shown in the embodiment of this utility model, the transport vehicle 1000 has two drive modules 300, which are installed on the frame 100 in the left-right direction. The two drive modules 300 are used together to drive the lifting module 200 to rise or fall, thereby improving the stability of the lifting module 200 during operation.

[0045] The two drive modules 300 are used to drive the lifting module 200 to rise or fall respectively. This separate and independent drive mechanism ensures that the lifting module 200 is evenly distributed with force during movement, reducing swaying and improving overall stability. In addition, the drive module 300 does not need to be designed with a main shaft running across the entire frame 100, which eliminates the encroachment of the traditional main shaft on the internal space of the frame 100, leaving sufficient space for the installation of key components such as electronic control devices and batteries, thereby making efficient use of limited space.

[0046] Reference Figure 2 As shown in the embodiment of this utility model, the lifting module 200 of the transport vehicle 1000 includes two plate groups 220 and two connecting rods 240. The two plate groups 220 are spaced apart in the left-right direction and are respectively connected to the second wheel group 210. The two connecting rods 240 are spaced apart in the front-back direction and are fixedly connected to the two plate groups 220.

[0047] Plate assembly 220 refers to the structural unit used to bear and transmit lifting forces. It can be made of metal sheet, composite material plate, or other materials with sufficient strength and rigidity. Connecting rod 240 refers to the component used to connect the two plate assemblies 220 and provide structural stability. It can be a cylindrical rod, a rectangular cross-section rod, or other form of rigid connector. By setting up two plate assemblies 220 and two connecting rods 240, a stable rigid frame can be constructed to solve the problem of easy twisting of the lifting module 200 under independent drive of the dual drive module 300, thereby ensuring that the transport vehicle 1000 moves smoothly on the track and improving the accuracy and reliability of cargo handling.

[0048] To improve guidance accuracy, refer to Figure 2 , Figure 4 and Figure 11As shown in the embodiment of this utility model, the drive module 300 further includes at least two guide plates 340 spaced apart in the front-back direction. The guide plates 340 are provided with guide grooves 341 extending in the up-down direction. The guide grooves 341 of the two guide plates 340 are respectively guided and cooperated with a connecting rod 240 to ensure that the lifting module 200 can move in the up-down direction, but will not move in the front-back direction.

[0049] In the above-described scheme, a limiting groove 342 extending vertically is provided on the side of the guide plate 340 facing the other guide plate 340. The two limiting grooves 342 respectively engage with the two corresponding mounting plates 230 for limiting. This structure utilizes the side of the guide fixing plate and the side of the mounting plate 230 for guidance, further constraining the degree of freedom of the lifting module 200 in the horizontal plane. Furthermore, the guide plate 340 directly engages with the mounting plate 230, reducing the use of additional guide sliders and lowering the number of parts and assembly difficulty.

[0050] Reference Figure 3 and Figure 11 As shown in the embodiment of this utility model, the plate assembly 220 includes two mounting plates 230 spaced apart in the front-rear direction. A limiting groove 342 extending in the vertical direction is provided on the side of the guide plate 340 facing the other guide plate 340. The two limiting grooves 342 respectively limit and cooperate with the two corresponding mounting plates 230, further ensuring that the lifting module 200 can move in the vertical direction but not in the front-rear direction. The limiting groove 342 refers to a strip-shaped groove structure provided on the guide plate 340, which can be formed by wire cutting or milling, and can constrain the movement trajectory of the mounting plate 230.

[0051] By adopting the above solution, and by setting a limiting groove 342 on the guide plate 340 and forming a cooperative relationship with the mounting plate 230, the problem of swaying in the front-back direction of the lifting module 200 is effectively solved. The two mounting plates 230 are arranged at intervals along the front-back direction, forming a stable support frame and providing a reliable structural foundation for the limiting cooperation. The design of the limiting groove 342 extending in the vertical direction allows the mounting plate 230 to perform necessary lifting movements within the groove, while the physical obstruction of the groove wall restricts the displacement of the mounting plate 230 in the front-back direction. This cooperation method ensures that the front-back degree of freedom of the lifting module 200 is eliminated during movement, reducing the possibility of torsion or tilting of the lifting module 200 due to single-point constraints. It ensures that the lifting module 200 moves accurately in the vertical direction during driving, improving the operational stability of the transport vehicle 1000 during track switching or load changes, and providing reliable mechanical protection for subsequent track switching operations.

[0052] Furthermore, this design, in conjunction with the guide groove 341, constitutes a dual constraint mechanism for the movement trajectory of the lifting module 200. The guide groove 341 is mainly responsible for constraining the vertical movement of the lifting module 200, while the limiting groove 342 focuses on eliminating swaying in the forward and backward directions and solving the over-constraint problem. The two work together to ensure that the lifting module 200 maintains a precise movement trajectory throughout the entire movement process, thereby improving the overall stability and positioning accuracy of the transport vehicle 1000, reducing the number of parts, and lowering the assembly difficulty.

[0053] Reference Figure 4 , Figure 5 and Figure 7 As shown in the embodiment of this utility model, the reduction assembly 320 includes a dual-output reducer 321. The dual-output reducer 321 has two output shafts 3211 at both ends along the front-rear direction. The output assembly 330 has two output shafts 3211 and is drivenly connected to the output shafts 3211 respectively. The output assembly 330 also includes an output box 334. The output box 334 has a worm gear 331 and a worm 332. Two guide plates 340 are respectively connected to the side of the output box 334 facing away from the other output box 334. The side of the guide plate 340 facing the output box 334 has one of the first protrusion 343 and the first groove 3341. The side of the output box 334 facing the guide plate 340 has the other of the first protrusion 343 and the first groove 3341. The first protrusion 343 and the first groove 3341 are positioned and engaged. The output box 334 and the guide plate 340 are connected by fasteners. The output box 334 and the guide plate 340 are modularly assembled, which is convenient for disassembly and assembly.

[0054] The first protrusion 343 refers to a protruding structure used for positioning, which can be cylindrical, rectangular, or other regular-shaped protrusions, providing positioning and alignment functions during assembly. The first groove 3341 is a recessed structure that matches the first protrusion 343, and its shape and size must correspond to the first protrusion 343 to ensure that the two can be positioned and fitted together.

[0055] Modular assembly refers to the method of decomposing complex mechanical equipment into several independent functional modules for assembly. Its core lies in achieving rapid connection and disassembly through standardized interfaces. Based on this, the modular assembly between the output box 334 and the guide plate 340 can be achieved through the design of unified mounting holes and positioning structures, thereby significantly simplifying the installation process and shortening maintenance time.

[0056] During installation, quick positioning is achieved through the interlocking of the first protrusion 343 and the first groove 3341 (similar to a mortise and tenon structure), followed by connection using fasteners. This design not only ensures assembly accuracy and improves connection strength, but also allows for easy disassembly of the guide plate 340 or output box 334 as an independent module during later maintenance, without the need to completely disassemble the entire vehicle.

[0057] Reference Figure 4 , Figure 5 and Figure 7 As shown in the embodiment of this utility model, the deceleration assembly 320 includes a reversing gearbox 322, which contains a gear set. The output assembly 330 also includes an output box 334, which contains a worm gear 331 and a worm 332. The worm 332 is drivenly connected to the gear set. One of the second protrusion 3221 and the second groove 3342 is provided on the side of the reversing gearbox 322 facing the output box 334. The other of the second protrusion 3221 and the second groove 3342 is provided on the side of the output box 334 facing the reversing gearbox 322. The second protrusion 3221 and the second groove 3342 are positioned and engaged. The output box 334 and the reversing gearbox 322 are connected by fasteners. The reversing gearbox 322 and the output box 334 are modularly assembled, which is convenient for disassembly and assembly.

[0058] It should be noted that the reversing gearbox 322 refers to a device used to change the direction of power transmission and integrate gear sets to achieve a speed reduction function. It can be implemented using multi-stage gear transmission or a planetary gear structure. For example, the gear set within the reversing gearbox 322 includes an input gear 3222 and an output gear 3223. The output gears 3223 mesh with each other, and the input gear 3222 is connected to the output shaft 3211 of the dual-output reducer 321. The output gear 3223 is connected to the worm gear 332. The output housing 334 can be understood as a housing structure encapsulating the worm wheel 331 and the worm gear 332, providing a stable installation environment and ensuring the meshing accuracy of the worm wheel 331 and the worm gear 332. The design of the second protrusion 3221 and the second groove 3342 is to achieve a rapid positioning function. Different shapes of protrusions and grooves can be combined to meet different assembly requirements, such as rectangular, circular, or other geometrical fitting designs, which simplifies the assembly process and improves positioning accuracy.

[0059] The second protrusion 3221 and the second groove 3342 are positioned and engaged, and fixed by fasteners. This modular design allows the dual-output reducer 321, the reversing gearbox 322 and the output box 334 to be moved or separated along the drive shaft direction, with a certain degree of positional flexibility, which further facilitates the layout and placement of electrical components inside the frame 100 of the pallet truck 1000 and subsequent maintenance and replacement.

[0060] Reference Figure 5 , Figure 6 and Figure 7As shown in the embodiment of this utility model, the reduction assembly 320 includes a planetary reducer 323, a dual-output reducer 321, and two reversing gearboxes 322. Two output assemblies 330 are provided. The input end of the planetary reducer 323 is connected to the output end of the lifting motor 310, and the output end of the planetary reducer 323 is connected to the input end of the dual-output reducer 321. The two output ends of the dual-output reducer 321 are respectively connected to the input ends of the two reversing gearboxes 322. The output ends of the two reversing gearboxes 322 are respectively connected to the worm gears 332 of the two output assemblies 330. A frame is connected between the two reversing gearboxes 322 to fix the position of the reversing gearboxes 322.

[0061] It should be noted that the planetary reducer 323 refers to a transmission device that achieves a high reduction ratio through a planetary gear set. It can employ a multi-stage planetary gear structure or a compound planetary gear structure, providing stable high reduction ratio power transmission. The dual-output reducer 321 can be understood as a reduction device with two symmetrical output ends. It can be implemented through a synchronous shaft design or a symmetrical gear set design, enabling bidirectional power distribution and ensuring synchronicity of the outputs on both sides. The reversing gearbox 322 refers to a gear device capable of changing the direction of power transmission. It can employ a bevel gear set or a helical gear set, allowing for flexible adjustment of the power transmission direction to adapt to complex operating conditions.

[0062] The reduction gear assembly 320 consists of a planetary reducer 323, a dual-output reducer 321, and a reversing gearbox 322. The output end of the lifting motor 310 is connected to the input end of the planetary reducer 323. After a single-stage reduction, the output end of the planetary reducer 323 is connected to the input end of the dual-output reducer 321. The dual-output reducer 321 splits the power and transmits it to the input end of the reversing gearbox 322. The reversing gearbox 322 contains a gear set for adjusting the transmission direction and further reducing speed. Its output end is finally connected to the worm gear 332. The worm gear 332 drives the worm wheel 331 and the swing arm 333, converting the rotational motion into the vertical motion of the lifting module 200. This transmission chain is compact in design, and through multi-stage reduction combined with the worm wheel 331 and worm gear 332 transmission, it effectively improves the torque output and ensures the smoothness of the lifting action.

[0063] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A transport vehicle, characterized in that, include: The frame has a first wheel set at each end along the front-rear direction; The lifting module has a second wheel set at each end along the left and right directions; A drive module, mounted on the vehicle frame, includes a lifting motor, a reduction gear assembly, and an output assembly. The output assembly includes a worm gear, a worm, and a swing arm. The lifting motor is driven to the input end of the reduction gear assembly, and the output end of the reduction gear assembly is driven to the worm. The worm meshes with the worm gear, the worm gear is fixedly connected to the swing arm, and the swing arm is driven to the lifting module. The swing arm is configured to swing under the drive of the worm gear to drive the lifting module to rise or fall.

2. The transport vehicle according to claim 1, characterized in that: The lifting module includes a mounting plate with a strip-shaped hole extending along the front-rear direction. One end of the swing arm is located in the strip-shaped hole and can move within the strip-shaped hole to drive the lifting module to rise or fall.

3. The transport vehicle according to claim 2, characterized in that: The lifting module includes two plate groups spaced apart in the left-right direction. Each plate group has two mounting plates spaced apart in the front-back direction. The deceleration assembly includes a dual-output reducer with an output shaft protruding from both ends of the dual-output reducer in the front-back direction. The output assembly has two components, each drivenly connected to both ends of the output shaft. One end of the swing arm of each of the two output components is respectively located in the strip hole of the corresponding mounting plate. The two swing arms are configured to swing synchronously in opposite directions.

4. The transport vehicle according to claim 2, characterized in that: The two side walls of the strip hole along the front-back direction are respectively constructed as a first arc-shaped surface and a second arc-shaped surface. The two side walls of the strip hole along the vertical direction are respectively constructed as a first plane and a second plane. The first plane is located above the second plane. The first arc-shaped surface and the second arc-shaped surface are respectively connected to the two ends of the second plane along the front-back direction. The first arc-shaped surface and the first plane are connected by a third arc-shaped surface. The second arc-shaped surface and the first plane are connected by a fourth arc-shaped surface. Along the vertical direction, the third arc-shaped surface and the fourth arc-shaped surface protrude upward from the first plane. The lifting module has sequentially increasing heights of a first height, a second height, and a third height. When the lifting module is at the first height, the first wheel set is suspended, and the second wheel set is configured to drive the transport vehicle to move in the forward-backward direction, with one end of the swing arm abutting against the third arc-shaped surface. When the lifting module is at the second height, the first wheel set is configured to drive the transport vehicle to move in the left-right direction, and the second wheel set is suspended, with one end of the swing arm located between the third arc-shaped surface and the fourth arc-shaped surface. When the lifting module is at the third height, one end of the swing arm abuts against the fourth arc-shaped surface.

5. The transport vehicle according to claim 2, characterized in that: The swing arm includes a rod and a bearing. The rod is driven and connected to the worm gear. The rod is provided with a connecting post spaced apart from the rotation center of the rod. The connecting post is fixedly connected to the inner ring of the bearing. The outer ring of the bearing is engaged with the wall of the strip hole.

6. The transport vehicle according to claim 1, characterized in that: The drive module is provided in two parts and is mounted on the frame along the left and right direction. The two drive modules are used together to drive the lifting module to rise or fall.

7. The transport vehicle according to claim 6, characterized in that: The lifting module includes two plate groups and two connecting rods. The two plate groups are spaced apart in the left-right direction and are respectively connected to the second wheel group. The two connecting rods are spaced apart in the front-back direction and are fixedly connected to the two plate groups.

8. The transport vehicle according to claim 7, characterized in that: The drive module further includes at least two guide plates spaced apart in the front-to-back direction. Each guide plate has a guide groove extending in the up-down direction, and the guide grooves of the two guide plates are respectively guided and engaged with a connecting rod.

9. The transport vehicle according to claim 8, characterized in that: The plate assembly includes two mounting plates spaced apart in the front-to-back direction. The guide plate has a limiting groove extending in the up-down direction on one side facing the other guide plate. The two limiting grooves respectively limit and cooperate with the two corresponding mounting plates.

10. The transport vehicle according to claim 8, characterized in that: The reduction assembly includes a dual-output reducer with an output shaft protruding from both ends of the reducer along the front-rear direction. Two output components are provided, each drivingly connected to one end of the output shaft. The output components also include an output housing containing the worm gear and the worm. Two guide plates are respectively connected to the side of the output housing facing away from the other output housing. One of a first protrusion and a first groove is provided on the side of the guide plate facing the output housing, and the other of the first protrusion and the first groove is provided on the side of the output housing facing the guide plate. The first protrusion and the first groove are positioned and engaged, and the output housing and the guide plate are connected by fasteners.

11. The transport vehicle according to claim 1, characterized in that: The deceleration assembly includes a reversing gearbox containing a gear set. The output assembly also includes an output box containing the worm gear and the worm. The worm and the gear set are drivenly connected. The reversing gearbox has one of a second protrusion and a second groove on its side facing the output box. The output box has the other of the second protrusion and the second groove on its side facing the reversing gearbox. The second protrusion and the second groove are positioned and engaged. The output box and the reversing gearbox are connected by fasteners.

12. The transport vehicle according to claim 1, characterized in that: The deceleration assembly includes a planetary reducer, a dual-output reducer, and two reversing gearboxes. The output assembly has two components. The input end of the planetary reducer is connected to the output end of the lifting motor. The output end of the planetary reducer is connected to the input end of the dual-output reducer. The two output ends of the dual-output reducer are respectively connected to the input ends of the two reversing gearboxes. The output ends of the two reversing gearboxes are respectively connected to the worm gears of the two output assemblies.

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