Lift truck

Abstract

The invention relates to the technical field of lifting devices, in particular to a lift truck. Comprising a lifting mechanism, a loading part and a bottom frame, wherein the loading part and the bottom frame are connected with the lifting mechanism; the first driving piece is connected with the lifting column; the chain wheel is connected with the output end of the first driving part; the two ends in the length direction of the annular chain are meshed with the chain wheels; the first rail is fixed to the annular chain and is in sliding connection with the lifting column, and the bottom frame is fixed to the first rail; the second track is fixed to the annular chain, the second track and the first track are located on the two sides of the annular chain, the second track is slidably connected with the lifting column, and the loading piece is fixed to the second track; the annular chain circularly moves along the periphery of the chain wheel to drive the loading piece and the bottom frame to move. Driving force needed by the lifting mechanism is stable, dead points do not exist, a unique movement sequence is formed through environmental resistance in the lifting process of the loading part and the bottom frame, the structure is simplified, cost is controlled, and meanwhile lifting reliability can be guaranteed.

Description

Technical Field

[0001] This invention relates to the technical field of lifting devices, and in particular to a lifting vehicle. Background Technology

[0002] Handcarts are a common means of transporting goods, suitable for short-distance transport or for transferring goods between storage points and motor vehicles in places where motor vehicles are inconvenient to use. Taking loading goods from a handcart onto a vehicle as an example, after a conventional handcart has transported the goods to the side of the vehicle, it is necessary to manually lift the goods on the handcart vertically to the height of the vehicle compartment before pushing the goods into the compartment, which is relatively laborious.

[0003] To reduce the need for manpower or other tools in transporting goods by handcart, the applicant disclosed a lifting cart with a sliding loading platform and an anti-tipping control method in Chinese Patent Publication No. CN118004922A. This lifting cart has a lifting assembly, a load-bearing assembly installed at the output end of the lifting assembly, and a sliding assembly connected to the load-bearing assembly and the lifting assembly for driving their horizontal movement. The lifting assembly is a scissor lift. When loading goods, the scissor lift opens to raise the load-bearing assembly to the height of the cart body. The sliding assembly pushes the load-bearing assembly onto the cart body. Then, the scissor lift closes, retracting the lower frame of the scissor lift from the ground to the height of the cart body. The sliding assembly then pushes the closed lifting assembly horizontally onto the cart body. The entire cart, along with the goods, completes the lifting of the cart body, allowing for further transfer of goods within the cart body.

[0004] The existing scissor lift mechanism in this type of flatbed truck, which can adjust its overall height with the vehicle, is a scissor lift. During lifting, the driving force of the scissor lift is not constant. When the scissor lift is closed at its lowest position, the scissor arm is nearly horizontal, and at this point, the scissor lift is at its dead point. Driving the scissor lift to open and lift the goods on the scissor lift platform at this dead point requires a very large driving force from a motor or cylinder. Therefore, existing scissor lift flatbed trucks with scissor lifts require very high-performance drives to load and lift heavy goods, resulting in high drive costs and short lifespans when transporting heavy loads. Summary of the Invention

[0005] To address the issues of high drive costs and short lifespan in current scissor lift vehicles used for transporting heavy goods, this invention aims to provide a lifting vehicle that utilizes a ring chain and vertically arranged double sliding rails to achieve overall lifting of the goods and the lifting vehicle. This lifting process eliminates dead spots and effectively reduces drive costs and extends drive lifespan when transporting heavy goods.

[0006] To achieve the objectives of this invention, the present invention provides a lifting vehicle, which adopts the following technical solution: A lifting vehicle includes a lifting mechanism, a loading component, and a base frame. The loading component and the base frame are connected to the lifting mechanism. The lifting mechanism includes: a lifting column; a first driving member connected to the lifting column; a sprocket connected to the output end of the first driving member; a ring chain with its two ends meshing on the sprocket along its length; a first track fixed to the ring chain, the first track being slidably connected to the lifting column, and the base frame being fixed to the first track; and a second track fixed to the ring chain, the second track and the first track being located on opposite sides of the ring chain, the second track being slidably connected to the lifting column, and the loading component being fixed to the second track. The first driving member drives the sprocket to rotate around its own axis, causing the ring chain to circulate along the outer circumference of the sprocket, thereby moving the loading component and the base frame.

[0007] The implementation can include any or all of the following features.

[0008] In one embodiment, when the lifting vehicle changes from a retracted state to an open state, the horizontal height of the base frame remains unchanged, the lifting column slides upward along the first track, and the second track slides upward along the lifting column; when the lifting vehicle changes from an open state to a folded state, the horizontal height of the loading component remains unchanged, the lifting column slides upward along the second track, and the first track slides upward along the lifting column.

[0009] In one embodiment, a first slider is fixed on the lifting column, and the first track is slidably engaged with the first slider; a second slider is also fixed on the lifting column, the second slider is located above the first slider, the second slider and the first slider are respectively located on both sides of the width direction of the lifting column, and the second track is slidably engaged with the second slider.

[0010] In one embodiment, the first track is fixed to a first mounting plate, and a first connector is provided between the first mounting plate and the annular chain. One end of the first connector is fixed to the first mounting plate, and the other end is fixed to a first side of the annular chain. The second track is fixed to a second mounting plate, and a second connector is provided between the second track and the annular chain. One end of the second connector is fixed to the second mounting plate, and the other end is fixed to a second side of the annular chain. The first side and the second side are located on opposite sides in the width direction of the lifting column.

[0011] In one embodiment, a rotating shaft is connected to the loading component, and a linkage mechanism is connected to the rotating shaft. The linkage mechanism includes a first link and a second link. One end of the first link is fixed to the rotating shaft, and the other end is rotatably connected to the second link. A wheel link is rotatably connected to the second link, and a second wheel is connected to the wheel link. The wheel link is rotatably connected to the loading component. When the rotating shaft rotates, the first link drives the second link to move the wheel link closer to or away from the second link.

[0012] In one embodiment, a third mounting shaft is rotatably mounted on the loading component, a fourth mounting shaft is fixed on the wheel connecting rod, the fourth mounting shaft is fixed to the third mounting shaft, the second connecting rod has a groove, the groove engages with the third mounting shaft, and the wheel connecting rod is locked to the open state.

[0013] In one embodiment, a handle is fixed on the rotating shaft, and the handle rotates around the center of the shaft hole of the rotating shaft. A first limiting member and a second limiting member are fixed on the loading member. The first limiting member and the second limiting member are located on the movement trajectory of the handle. When the handle is fixed to the first limiting member, the wheel connecting rod is locked to the open state. When the handle is fixed to the second limiting member, the wheel connecting rod is locked to the folded state.

[0014] In one embodiment, the loading member includes a loading fork tooth fixed to the second mounting plate; a second connecting rod is arranged within the loading fork tooth along its length direction, and a rotating shaft is rotatably inserted through the loading fork tooth along its width direction.

[0015] In one embodiment, the sprocket includes a first sprocket and a second sprocket, the second sprocket being located above the first sprocket. The first sprocket is fixed to the output end of the first drive member. The second sprocket is rotatably connected to a first mounting shaft, which passes through the lifting column. A tensioning mechanism is provided between the first mounting shaft and the lifting column. The portion of the lifting column through which the first mounting shaft passes has a travel space. By adjusting the tensioning mechanism, the first mounting shaft moves within the travel space, and the annular chain is tensioned or relaxed.

[0016] In one embodiment, the tensioning mechanism includes a tensioning block and a tensioning rod. The tensioning rod passes through the tensioning block and is threadedly connected to the tensioning block. The tensioning block is fixed to the lifting column. One end of the tensioning rod in the length direction abuts against the lower surface of the first mounting shaft, and the other end is suspended. When the tensioning rod is rotated, the tensioning rod moves up and down along the tensioning block, causing the first mounting shaft to move.

[0017] In one embodiment, the base frame includes a base and a support fork, the support fork being fixed to the first mounting plate and the base; a moving mechanism is mounted on the base, the moving mechanism being connected to the support fork and controlling the horizontal movement of the support fork.

[0018] In one embodiment, the moving mechanism includes a first sleeve, which is arranged along the length direction of the supporting fork tooth, and the supporting fork tooth passes through the first sleeve and can move along the first sleeve; the moving mechanism also includes a second sleeve and a third sleeve, one end of the second sleeve passes through the third sleeve and can move along the third sleeve, and the other end is fixed to the first sleeve, and the third sleeve is fixed to the base along the width direction of the supporting fork tooth.

[0019] In one embodiment, a support mechanism is fixed on the base frame. The support mechanism includes a second drive member and a support member. The output end of the second drive member is connected to the support member. The second drive member drives the support member to move up and down along the length direction of the first track. When the loading member transfers the goods from the first height to the second height and the base frame is raised to the second height, the support member abuts against the plane where the first height is located.

[0020] In one embodiment, electric wheels are mounted on the base frame.

[0021] In summary, the present invention provides a lifting vehicle with the following beneficial effects: First, the lifting vehicle of this application uses a lifting column, a first driving component, a ring chain, a sprocket, a first rail, and a second rail to achieve lifting. During the lifting process, the driving force of the first driving component is always smoothly transmitted to the ring chain through the sprocket. During the cyclic movement of the ring chain, the loading component and the base frame are raised sequentially by the sliding connection between the first rail, the second rail, and the lifting column, avoiding the dead point problem of traditional scissor lift mechanisms. It can carry heavy goods weighing up to 450 kg. In the transportation of heavy goods, it significantly reduces the procurement and maintenance costs of high-power drive components. At the same time, the first driving component always works under a stable load, which can significantly extend the service life of the first driving component.

[0022] Secondly, the wheel linkage on the loading component of this application folds and unfolds under the control of the rotating shaft and linkage mechanism. The engagement between the groove and the third mounting shaft, as well as the cooperation between the first and second limiting members and the handle, locks the folded or unfolded state of the wheel linkage. When loading goods, locking the wheel linkage in the folded state facilitates the smooth insertion of the support forks into pallets of different heights without being affected by the wheel linkage's height. It also avoids the uneven force distribution and wobbling that occurs with conventional non-foldable wheels, thus improving loading stability. When unloading goods, locking the wheel linkage in the unfolded state allows it to stably abut against the truck bed. At this time, as the ring chain circulates, the lifting column can only slide upwards along the first track, thereby raising the underframe to the truck bed height. During the underframe raising process, the goods can be stably placed on the loading component without contacting the truck bed surface.

[0023] Third, the cooperation between the loading fork teeth and the first, second, and third sleeves in this application allows the loading fork teeth to extend along their length and width, expanding their load-bearing area and facilitating the loading and transportation of goods of different sizes. Simultaneously, adjusting the forward extension length of the loading fork teeth during the underframe lifting process makes it easy to lift the entire lifting vehicle to the truck bed level.

[0024] Fourth, the lifting vehicle of this application must not tilt forward after loading goods. The lifting vehicle's chassis, lifting column, first rail, and second rail are heavy, making the lifting vehicle itself heavy. At the same time, it must also ensure that the chassis does not tilt backward after the empty vehicle is unloaded. A support mechanism is set up to drive the support component downward to abut against the plane of the first height (e.g., the ground) after the chassis is raised, forming another support point between the chassis and the first height plane, preventing the lifting vehicle from tilting backward and improving the stability and safety of the lifting vehicle. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the aerial work platform when it is in the open position. Figure 2 This is a structural diagram of the lifting mechanism and loading components when the aerial work platform is in the open position. Figure 3 A schematic diagram of the internal structure of the lifting column when the lifting vehicle is in the open position; Figure 4 A schematic diagram of a lifting platform for raising cargo pallets; Figure 5 This is a structural schematic diagram of the loading component; Figure 6 This is a schematic diagram of the overall structure of the lifting vehicle when it is in the open state, viewed from another perspective. Figure 7 This is a schematic diagram of the lifting vehicle in its retracted state.

[0026] Explanation of reference numerals in the attached figures: 1. Lifting mechanism; 11. Lifting column; 12. First driving component; 13. Transmission assembly; 131. First sprocket; 132. Second sprocket; 133. Ring chain; 1331. First connecting component; 1332. Second connecting component; 14. Sliding assembly; 141. First slider; 142. Second slider; 143. First track; 144. Second track; 15. First mounting plate; 16. Second mounting plate; 17. Mounting hole; 18. First mounting shaft; 2. Tensioning mechanism; 21. Tensioning block; 22. Tensioning rod; 3. Loading components; 31. Loading fork teeth; 32. Mounting tube; 4. Base frame; 41. Base; 411. Fourth wheel; 42. Support fork tooth; 421. First protrusion; 422. Second wheel; 5. Rotating shaft; 51. Handle; 511. First limiting component; 512. Second limiting component; 513. Pin hole; 6. Linkage mechanism; 61. First link; 62. Second link; 621. Groove; 63. Wheel link; 631. First rod; 6311. First wheel; 632. Second rod; 6321. Third mounting shaft; 6322. Fourth mounting shaft; 7. Moving mechanism; 71. First sleeve; 72. Second sleeve; 73. Third sleeve; 74. Limiting assembly; 741. Stroke groove; 742. Second protrusion; 8. Support mechanism; 81. Support component; 811. Inner tube; 8111. Rack; 8112. Third wheel; 812. Outer tube; 813. Second drive component; 9. Tray. Detailed Implementation

[0027] To make the objectives and technical solutions of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The directional terms mentioned in the following embodiments, such as up, down, left, right, front, back, bottom, top, X direction, Y direction, Z direction, etc., are only for reference to the accompanying drawings. Therefore, the directional terms used are for illustrative purposes and not for limiting the present invention.

[0028] This invention discloses a lifting vehicle capable of lifting goods at a first height, such as the ground, to a second height, such as the cargo box surface, and completely lifting the lifting vehicle body to the second height, such as the cargo box surface, for use. (See reference...) Figure 1 The lifting vehicle includes a lifting mechanism 1, a loading component 3, and a base frame 4. The loading component 3 and the base frame 4 are connected to the lifting mechanism 1. When the lifting mechanism 1 moves, it causes the loading component 3 and the base frame 4 to move away from or towards each other. When the loading component 3 moves away from the base frame 4, the lifting vehicle opens. When the base frame 4 moves closer to the loading component 3, the lifting vehicle retracts.

[0029] Reference Figure 2 The lifting mechanism 1 includes a lifting column 11, on which a first drive member 12 and a transmission assembly 13 are mounted. The output end of the first drive member 12 is connected to the transmission assembly 13. The transmission assembly 13 includes a first sprocket 131 and a second sprocket 132 (only the installation position of the second sprocket 132 is shown in the figure). Along the length of the lifting column 11, the second sprocket 132 is arranged above the first sprocket 131 and is rotatably connected to the lifting column 11. The first sprocket 131 is fixed to the output end of the first drive member 12. The transmission assembly 13 also includes an annular chain 133 mounted on both the first sprocket 131 and the second sprocket 132. The lower end of the annular chain 133 meshes with the first sprocket 131, and the upper end meshes with the second sprocket 132. The first drive member 12 uses a motor capable of outputting torque. When the first drive member 12 moves, it drives the first sprocket 131 to rotate around its own axis, causing the annular chain 133 to circulate around the outer periphery of the first sprocket 131 and the second sprocket 132. In one specific embodiment, the annular chain 133 is an annular roller chain.

[0030] Reference Figure 3 The lifting column 11 is also equipped with a sliding assembly 14. The sliding assembly 14 includes a first slider 141 and a second slider 142, respectively fixed at both ends of the lifting column 11 along its length (Z direction). The second slider 142 is located above the first slider 141, and the second slider 142 and the first slider 141 are located on opposite sides of the lifting column 11 along the X direction. The sliding assembly 14 also includes a first rail 143 and a second rail 144, respectively slidably connected to the sliders (141; 142) on the lifting column 11. One side of the first rail 143 along the X direction is fixed to the first mounting plate 15, and the other side passes through the first slider 141 and is slidably connected to it. One side of the second rail 144 along the X direction is fixed to the second mounting plate 16, and the other side passes through the second slider 142 and is slidably connected to it. Both the first rail 143 and the second rail 144 extend along the length of the lifting column 11. Figure 4A first connector 1331 is provided between the first mounting plate 15 and the annular chain 133. One end of the first connector 1331 is fixed to the first mounting plate 15, and the other end is fixed to the first side of the annular chain 133. The base frame 4 is connected to the lower end of the first mounting plate 15. A second connector 1332 is provided between the second track 144 and the annular chain 133. One end of the second connector 1332 is fixed to the second mounting plate 16, and the other end is fixed to the second side of the annular chain 133. The first side and the second side of the annular chain 133 are located on opposite sides of the lifting column 11 in the X direction. The loading component 3 is fixed to the second mounting plate 16. When the annular chain 133 moves cyclically, it drives the first connector 1331 and the second connector 1332 to move simultaneously, causing relative sliding between the first track 143 and the first slider 141, and between the second track 144 and the second slider 142. This causes the loading component 3 to move away from the base frame 4 or the base frame 4 to move closer to the loading component 3.

[0031] Reference Figure 2 To ensure smoother movement of the lifting mechanism 1 driving the loading component 3 and the base frame 4, the transmission components 13 are symmetrically arranged on both sides of the lifting column 11 in the Y direction. The first driving component 12 is fixed to one side of the lifting column 11 in the Y direction, and the output shaft of the first driving component 12 passes from one side of the lifting column 11 in the Y direction to the other side. Two symmetrically arranged first sprockets 131 are fixed on the output shaft of the first driving component 12. Correspondingly, first connecting members 1331 for fixing to the corresponding annular chains 133 are fixed on both sides of the first mounting plate 15 in the Y direction. The two first connecting members 1331 are symmetrically arranged, and the first track 143 is located between the two first connecting members 1331. Second connecting members 1332 for fixing to the corresponding annular chains 133 are fixed on both sides of the second mounting plate 16 in the Y direction. The two second connecting members 1332 are symmetrically arranged, and the second track 144 is located between the two second connecting members 1332.

[0032] Reference Figure 4 The upper end of the lifting column 11 is provided with a mounting hole 17 (see...). Figure 3A first mounting shaft 18 is inserted into the mounting hole 17. A second sprocket 132 is rotatably connected to both axial ends of the first mounting shaft 18. A tensioning mechanism 2 is provided between the first mounting shaft 18 and the lifting column 11. The tensioning mechanism 2 includes a tensioning block 21 and a tensioning rod 22. The tensioning rod 22 passes through the tensioning block 21 and is threadedly connected to the tensioning block 21. The tensioning block 21 is fixed to the Y-direction side wall of the lifting column 11. One end of the tensioning rod 22 abuts against the lower surface of the first mounting shaft 18, and the other end is suspended. The mounting hole 17 is an oblong hole extending along the length of the lifting column 11, which provides travel space for the first mounting shaft 18 to move on the lifting column 11 during tensioning. Rotating the tensioning rod 22 causes the tensioning rod 22 to move up and down along the tensioning block 21, changing the horizontal height of the first mounting shaft 18 in the mounting hole 17, thereby achieving tensioning or slack of the annular chain 133. The diameter of the first mounting shaft 18 located on both sides of the mounting hole 17 is greater than the length of the short shaft of the mounting hole 17, which is used to limit the axial movement of the first mounting shaft 18 within the mounting hole 17.

[0033] Reference Figure 4 The loading component 3 includes a loading fork 31, which is arranged horizontally. A mounting tube 32 is fixed to one end of the loading fork 31 facing the second mounting plate 16. The mounting tube 32 is fixed to the second mounting plate 16. The loading fork 31 and the second track 144 are located on opposite sides of the mounting plate. Figure 5The loading fork 31 has a hollow structure, and a rotating shaft 5 is installed inside the loading fork 31. The rotating shaft 5 extends along the width direction of the loading fork 31, passes through the loading fork 31, and is rotatably connected to the loading fork 31. A linkage mechanism 6 is connected to the rotating shaft 5. The linkage mechanism 6 includes a first link 61 and a second link 62. One end of the first link 61 is rotatably connected to the second link 62 along its length direction, and the other end is sleeved and fixed on the rotating shaft 5. Both the first link 61 and the second link 62 are located inside the loading fork 31. The second link 62 extends along the length direction of the loading fork 31 and is located above the rotating shaft 5. The first link 61 is inclinedly connected between the rotating shaft 5 and the second link 62. The linkage mechanism 6 also includes a wheel link 63 rotatably connected to the second link 62. A first wheel 6311 is rotatably connected to the end of the wheel link 63 away from the second link 62. Specifically, the wheel link 63 is installed as follows: a second mounting shaft (not shown in the figure) is rotatably connected to the second link 62. The end of the wheel link 63 facing the second link 62 is sleeved and rigidly fixed to the second mounting shaft. A third mounting shaft 6321 is rotatably connected to the loading fork 31 below the second mounting shaft. A fourth mounting shaft 6322 is fixed to the wheel link 63. The fourth mounting shaft 6322 is sleeved and rigidly fixed to the third mounting shaft 6321. The fourth mounting shaft 6322 is located between the second mounting shaft and the first wheel 6311. When the rotating shaft 5 rotates, it drives the first link 61 to rotate synchronously. The movement of the first link 61 drives the second link 62 to swing, which in turn drives the second mounting shaft to move synchronously with the second link 62. This allows the wheel link 63 to move closer to or further away from the second link 62 under the constraint of the third mounting shaft 6321, thus realizing the folding or unfolding of the wheel link 63. The wheel link 63 includes a first link 631 and a second link 632. The second link 632 is fixed at a certain angle to the upper end of the first link 631. The included angle between the first link 631 and the second link 632 is an obtuse angle, which can be 145°. A first wheel 6311 is mounted on the lower end of the first link 631. A second mounting shaft is connected to the upper end of the second link 632. A third mounting shaft 6321 and a fourth mounting shaft 6322 are connected at the junction of the first link 631 and the second link 632. In the folded state, the first link 631 and the second link 62 are parallel, allowing the wheel link 63 to be completely folded and stored within the second fork.

[0034] Reference Figure 5 The lower edge of the second connecting rod 62 is provided with a groove 621. The shape of the groove 621 matches the shape of the third mounting shaft 6321. As the second connecting rod 62 swings forward, the wheel connecting rod 63 gradually moves away from the second connecting rod 62 and unfolds. The groove 621 gradually moves closer to the third mounting shaft 6321. When the groove 621 is engaged with the third mounting shaft 6321, the second connecting rod 62 stops moving, thus locking the wheel connecting rod 63 in the unfolded state.

[0035] Reference Figure 5 Meanwhile, to facilitate locking of the wheel link 63 in the folded state, a handle 51 is fixed on the rotating shaft 5. The handle 51 is located at one end of the rotating shaft 5 along its length and outside the loading fork 31. The handle 51 extends radially along the rotating shaft 5, and turning the handle 51 causes the rotating shaft 5 to rotate synchronously. A first limiting member 511 is fixed to the side of the loading fork 31 on the side where the handle 51 is located, and a second limiting member 512 is fixed to the side of the mounting tube 32 on the side where the handle 51 is located. Both the first limiting member 511 and the second limiting member 512 are located on the movement trajectory of the handle 51, with the second limiting member 512 located above the first limiting member 511. The first limiting member 511 and the second limiting member 512 can be pins (not shown in the figure) fixed to the loading fork 31, and a pin hole 513 for fitting the pin is opened at the far end of the handle 51 away from the rotating shaft 5. When the handle 51 is rotated upwards until the pin hole 513 aligns with the second limiting member 512, the pin hole 513 is fitted onto the second limiting member 512, at which point the wheel connecting rod 63 is locked in a folded state. When the handle 51 is rotated downwards until the pin hole 513 aligns with the first limiting member 511, the pin hole 513 is fitted onto the first limiting member 511, at which point the wheel connecting rod 63 is locked in an open state. The groove 621 can be set to engage the third mounting shaft 6321, thus aligning the pin hole 513 with the first limiting member 511. The hollow loading fork 31 provides travel space for the rotating shaft 5 and the connecting rod mechanism 6 to move axially along the rotating shaft 5. When the pin hole 513 is fitted onto the first limiting member 511 or the second limiting member 512, the rotating shaft 5 is pulled towards the handle 51. After fitting, the rotating shaft 5 is pushed back away from the handle 51, thus fitting the handle 51 onto the first limiting member 511 or the second limiting member 512.

[0036] Reference Figure 5 The rotating shaft 5 is made of a prism, such as a prism with a regular hexagonal cross-section. The hole on the loading fork 31 for the rotating shaft 5 to pass through is a round hole to ensure that the rotating shaft 5 can rotate normally within the loading fork 31. The hole in the first connecting rod 61 for the rotating shaft 5 to pass through is an internal hexagon that matches the shape of the rotating shaft 5, so that the first connecting rod 61 can be fitted onto the rotating shaft 5 at a fixed angle and move with the rotating shaft 5 without mutual rotation. The handle 51 is also fitted onto the rotating shaft 5 through an internal hexagon that matches the shape of the rotating shaft 5.

[0037] Reference Figure 5 At least one set of linkage mechanism 6 is connected to each end of the length direction of the rotating shaft 5. Each set of linkage mechanism 6 is located inside the outermost loading fork tooth 31 on the left and right. Each second link 62 is connected to a wheel link 63 at least at both the front and rear ends, so that the bottom of the loading fork tooth 31 has at least 4 evenly distributed wheel links 63, ensuring that the wheel links 63 can provide stable and balanced support for the loading fork tooth 31.

[0038] Reference Figure 6The base frame 4 includes a base 41 and a support fork 42. The support fork 42 is connected to the base 41, and the upper surface of the base 41 is fixed to the first mounting plate 15 and the first track 143. A moving mechanism 7 is provided on the base 41 along both the length and width directions of the support fork 42. The moving mechanism 7 is connected to the support fork 42 and drives the support fork 42 to move along its length and width directions. Specifically, a first sleeve 71 is fitted onto the support fork 42, allowing the support fork 42 to move back and forth within the first sleeve 71. A second sleeve 72 is fixedly connected to the first sleeve 71, extending along the width direction of the support fork 42. A third sleeve 73 is fixedly attached to the base 41 along the width direction of the support fork 42, with the second sleeve 72 passing through and moving along the third sleeve 73. The moving mechanism 7 can change the forward extension length of the support fork 42 and the overall width of the base, increasing the ease of use of the lifting vehicle.

[0039] Reference Figure 6 To prevent the support fork 42 from being pulled out of the first sleeve 71, a first protrusion 421 is fixed to one end of the support fork 42 along its length, and a second wheel 422 is installed at the other end along its length. The first protrusion 421 and the second wheel 422 can restrict the forward and backward movement of the support fork 42 within the first sleeve 71. The first protrusion 421 can be a bolt protruding from the end face of the support fork 42, such as a U-bolt. To prevent the second sleeve 72 from being pulled out of the third sleeve 73, a limiting component 74 is provided between the second sleeve 72 and the third sleeve 73. The limiting component 74 includes a travel groove 741, which is formed along the length of the third sleeve 73. The limiting component 74 also includes a second protrusion 742 that cooperates with the travel groove 741. One end of the second protrusion 742 passes through the travel groove 741 and can slide along the travel groove 741, while the other end is fixed to the second sleeve 72.

[0040] Reference Figure 6 A support mechanism 8 is fixed on the base 41 behind the first mounting plate 15. The support mechanism 8 includes a support member 81, which extends along the length of the first track 143. The support member 81 includes an inner tube 811 and an outer tube 812. The outer tube 812 is sleeved on the inner tube 811, and its lower end is fixed to the base 41. A rack 8111 is provided on the inner tube 811 along its length, and a third wheel 8112 is installed at the lower end of the inner tube 811. The support mechanism 8 also includes a second drive member 813. The output end of the second drive member 813 meshes with the rack 8111, and the output torque of the second drive member 813 drives the inner tube 811 to rise and fall along the length of the first track 143. The support mechanism 8 is used to drive the inner tube 811 downward to contact the ground after the base frame 4 rises, providing rear support for the lifting vehicle and preventing it from tilting backward when the base frame 4 rises after unloading.

[0041] Reference Figure 1 A fourth wheel 411 is mounted on the bottom surface of the base 41. When the lifting vehicle is in the retracted state, the lower edges of the fourth wheel 411 and the second wheel 422 on the support fork 42 are on the same plane, allowing them to simultaneously contact the placement surface of the lifting vehicle, providing stable and balanced support. The fourth wheel 411 is an electric wheel, such as an electric wheel that can be controlled by a handle or button to move forward, backward, and turn. The electric wheel is a commercially available electric wheel that meets the load-bearing requirements of the lifting vehicle.

[0042] The implementation process of a lifting vehicle according to an embodiment of the present invention is as follows: Reference Figure 7 Before using the lifting vehicle of this application to transfer goods, the lifting vehicle is placed in a retracted state on a first plane, such as the ground, and the horizontal height of the first plane is defined as the first height. The loading fork 31 is located inside the supporting fork 42, and the upper end face of the supporting fork 42 and the loading fork 31 are on the same plane. The wheel connecting rod 63 is locked in a folded state, and the second wheel 422 and the fourth wheel 411 simultaneously contact the first plane. The first connecting member 1331 is located above the second connecting member 1332. The fourth wheel 411 drives the lifting vehicle to move to the side of the goods to be transported on the first plane. The support fork 42 and loading fork 31 are inserted into the middle of the goods pallet 9. The first drive unit 12 is started to rotate forward. The ring chain 133 begins to circulate along direction A on the outer circumference of the sprocket. At this time, the ground generates resistance to the support fork 42, forcing the first slider 141 to slide upward along the first track 143. The support fork 42 is still on the first plane. The lifting column 11 gradually rises. At the same time, the second track 144 slides upward along the second slider 142. The second connecting member 1332 and the second mounting plate 16 fixed to the second connecting member 1332 rise synchronously. The loading fork 31 loads the goods and its pallet 9 and rises to the second plane (e.g., the car body surface) and then stops. The lifting vehicle is in the deployed state. Figure 4 As shown, the height of the second plane is defined as the second height. After the goods are lifted from the first height to the second height, the first drive component 12 is closed. At this time, unloading can be carried out, or the goods can be unloaded after the base frame 4 is lifted to the second height.

[0043] Reference Figure 4The fourth wheel 411 drives the extended lifting vehicle to move on the first plane, extending the loading fork 31 into the carriage and the supporting fork 42 into the carriage. The drive wheel linkage 63 extends and locks the wheel linkage 63 to the open state, so that the first wheel 6311 abuts against the carriage surface. The first drive component 12 is started to reverse, and the ring chain 133 moves in a circular motion along direction B around the sprocket. At this time, the carriage surface generates resistance to the loading fork 31, forcing the second slider 142 to slide upward along the second track 144. The lifting column 11 gradually rises, and the loading fork 31 remains on the carriage surface. At the same time, the first track 143 slides upward along the first slider 141, causing the first mounting plate 15 to drive the base frame 4 to rise to the second height. During the rise of the base frame 4, the supporting fork 42 moves away from the carriage to avoid the supporting fork 42 from contacting the carriage. After the base frame 4 rises to the second height, the lifting vehicle returns to the retracted state. Move the support fork 42 into the carriage to raise the entire lifting vehicle from the first height to the second height. At this point, unloading can be carried out, or the lifting vehicle can be used to transfer goods within the second plane. Due to the heavy weight of the lifting vehicle, in order to prevent the entire vehicle from tilting backward after the base frame 4 is raised and after unloading, the second drive component 813 is opened when the base frame 4 rises, driving the inner tube 811 to descend. After the base frame 4 rises, the third wheel 8112 of the inner tube 811 abuts against the first plane, providing rear support for the lifting vehicle after unloading. When the lifting vehicle is to be used with the vehicle, simply retract the inner tube 811 upward.

[0044] The lifting mechanism 1 of this application requires a stable driving force and has no dead point problem, which greatly reduces the procurement and maintenance costs of high-power drive components, and the lifting process is also more stable. Furthermore, when the lifting vehicle is opened and closed by the ring chain 133, the resistance of the ground and the vehicle body surface is used to make the second mounting plate 16 and the first mounting plate 15 form a unique movement sequence, without the need for a separate sequence control mechanism. This simplifies the structure, controls costs, and ensures the reliability of the lifting.

[0045] In the description of the embodiments of this invention, unless otherwise explicitly specified and limited, the term "fixed" should be interpreted broadly. For example, fixing can refer to fixing connection methods such as welding, riveting, keying, threading, and integral connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0046] Finally, it should be noted that the above-described embodiments are merely specific implementations of the present invention, used to illustrate the technical solutions of the present invention, and not to limit them. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the scope of the technology disclosed in the present invention, or make equivalent substitutions for some of the technical features; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the scope of protection of the present invention.

Claims

1. A lifting vehicle, characterized in that, The system includes a lifting mechanism, a loading component, and a base frame, wherein the loading component and the base frame are connected to the lifting mechanism; the lifting mechanism includes: Lifting column; The first driving component is connected to the lifting column; The sprocket is connected to the output end of the first drive component; A ring chain, with its two ends meshing on the sprocket along its length; The first track is fixed to the annular chain, the first track is slidably connected to the lifting column, and the base frame is fixed to the first track; The second track is fixed to the annular chain. The second track and the first track are located on both sides of the annular chain. The second track is slidably connected to the lifting column. The loading component is fixed to the second track. The first driving member drives the sprocket to rotate around its own axis, causing the annular chain to move cyclically along the outer periphery of the sprocket, thereby driving the loading member and the base frame to move.

2. The lifting vehicle as described in claim 1, characterized in that, When the lifting vehicle changes from the retracted state to the open state, the horizontal height of the base frame remains unchanged, the lifting column slides upward along the first track, and the second track slides upward along the lifting column; when the lifting vehicle changes from the open state to the folded state, the horizontal height of the loading component remains unchanged, the lifting column slides upward along the second track, and the first track slides upward along the lifting column.

3. A lifting vehicle as described in claim 2, characterized in that, A first slider is fixed on the lifting column, and the first track slides in cooperation with the first slider; a second slider is also fixed on the lifting column, the second slider is located above the first slider, the second slider and the first slider are respectively located on both sides of the width direction of the lifting column, and the second track slides in cooperation with the second slider.

4. A lifting vehicle as described in claim 3, characterized in that, The first track is fixed to the first mounting plate, and a first connector is provided between the first mounting plate and the annular chain. One end of the first connector is fixed to the first mounting plate, and the other end is fixed to the first side of the annular chain. The second track is fixed to the second mounting plate, and a second connector is provided between the second track and the annular chain. One end of the second connector is fixed to the second mounting plate, and the other end is fixed to the second side of the annular chain. The first side and the second side are located on opposite sides of the lifting column in the width direction.

5. A lifting vehicle as described in claim 4, characterized in that, The loading component is connected to a rotating shaft, and a linkage mechanism is connected to the rotating shaft. The linkage mechanism includes a first link and a second link. One end of the first link is fixed to the rotating shaft, and the other end is rotatably connected to the second link. A wheel link is rotatably connected to the second link, and a second wheel is connected to the wheel link. The wheel link is rotatably connected to the loading component. When the rotating shaft rotates, the first link drives the second link to move the wheel link closer to or away from the second link.

6. A lifting vehicle as described in claim 5, characterized in that, The loading component has a third mounting shaft that rotates on it, and the wheel connecting rod has a fourth mounting shaft that is fixed on it. The fourth mounting shaft is fixed to the third mounting shaft. The second connecting rod has a groove that engages with the third mounting shaft. The wheel connecting rod is locked to the open state.

7. A lifting vehicle as described in claim 6, characterized in that, A handle is fixed on the rotating shaft, and the handle rotates around the center of the shaft hole of the rotating shaft. A first limiting member and a second limiting member are fixed on the loading member. The first limiting member and the second limiting member are located on the movement trajectory of the handle. When the handle is fixed to the first limiting member, the wheel connecting rod is locked to the open state. When the handle is fixed to the second limiting member, the wheel connecting rod is locked to the folded state.

8. A lifting vehicle as described in claim 5, characterized in that, The loading component includes a loading fork tooth, which is fixed to the second mounting plate; the second connecting rod is arranged inside the loading fork tooth along the length direction of the loading fork tooth, and the rotating shaft is rotatably inserted inside the loading fork tooth along the width direction of the loading fork tooth.

9. A lifting vehicle as described in claim 1, characterized in that, The sprocket includes a first sprocket and a second sprocket. The second sprocket is located above the first sprocket. The first sprocket is fixed to the output end of the first drive component. The second sprocket is rotatably connected to a first mounting shaft. The first mounting shaft passes through the lifting column. A tensioning mechanism is provided between the first mounting shaft and the lifting column. The lifting column has a travel space at the part through which the first mounting shaft passes. By adjusting the tensioning mechanism, the first mounting shaft moves within the travel space, and the annular chain is tensioned or relaxed.

10. A lifting vehicle as described in claim 9, characterized in that, The tensioning mechanism includes a tensioning block and a tensioning rod. The tensioning rod passes through the tensioning block and is threadedly connected to the tensioning block. The tensioning block is fixed to the lifting column. One end of the tensioning rod in the length direction abuts against the lower surface of the first mounting shaft, and the other end is suspended. When the tensioning rod is rotated, the tensioning rod moves up and down along the tensioning block, causing the first mounting shaft to move.

11. A lifting vehicle as described in claim 1, characterized in that, The base frame includes a base and a support fork, the support fork being fixed to the first mounting plate and the base; a moving mechanism is mounted on the base, the moving mechanism being connected to the support fork and controlling the horizontal movement of the support fork.

12. A lifting vehicle as described in claim 11, characterized in that, The moving mechanism includes a first sleeve, which is arranged along the length direction of the supporting fork tooth. The supporting fork tooth passes through the first sleeve and can move along the first sleeve. The moving mechanism also includes a second sleeve and a third sleeve. One end of the second sleeve passes through the third sleeve and can move along the third sleeve, while the other end is fixed to the first sleeve. The third sleeve is fixed to the base along the width direction of the supporting fork tooth.

13. A lifting vehicle as described in claim 1, characterized in that, A support mechanism is fixed on the base frame. The support mechanism includes a second drive component and a support component. The output end of the second drive component is connected to the support component. The second drive component drives the support component to move up and down along the length direction of the first track. When the loading component transfers the goods from the first height to the second height and the base frame is raised to the second height, the support component abuts against the plane where the first height is located.

14. A lifting vehicle as described in claim 1, characterized in that, The base frame is equipped with electric wheels.

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