A constant height platform truck
By designing a height-adjustable trolley and utilizing a combination of electric push rods and damping hydraulic rods, the height of the material box can be automatically adjusted, solving the problems of lumbar muscle strain and low work efficiency caused by existing trolleys, and achieving stable and efficient material transportation and retrieval.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- TIANXING AUTOMATION RIZHAO CO LTD
- Filing Date
- 2025-10-24
- Publication Date
- 2026-08-04
AI Technical Summary
The existing trolleys only have the functions of carrying and moving. When the material in the upper material box is used up, the lower material box will decrease with the stacking height, which requires employees to repeatedly bend over to pick up the lower material. Long-term operation leads to lumbar muscle strain and reduces the efficiency of the assembly line. The industry has alleviated this by reducing the number of stacking layers, but this increases the frequency of material box replacement and reduces production efficiency.
A height-fixed trolley was designed. Through a combination of electric push rods, damped hydraulic rods, and cylindrical helical tension springs, it ensures that the top material box on the support plate is always kept at a preset height, automatically compensates for changes in stacking height, avoids employees bending over to operate, and uses casters and annular limit protrusions to ensure stability and safety.
It eliminates the need for employees to bend over to pick up materials, reducing the risk of lumbar muscle strain, improving the efficiency of assembly line operations, adapting to different stacking layers, reducing the failure rate, and meeting various assembly line needs.
Smart Images
Figure CN224589178U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of auxiliary equipment for production lines, specifically a fixed-height trolley. Background Technology
[0002] A production line trolley, also known as a production line trolley, material trolley, or tooling trolley, is a specialized mobile device used in industrial production lines to carry, transport, temporarily store, and recycle materials, semi-finished products, finished products, or tools.
[0003] In production lines for automobiles and their parts, electronic components, and food processing and assembly, employees frequently need to retrieve materials from material boxes. To increase material storage capacity, material boxes are usually stacked on trolleys. However, existing trolleys only have the functions of carrying and moving. When the materials in the upper material box are used up and removed, the lower material box will descend as the stack height decreases, causing employees to repeatedly bend over to retrieve materials from the lower layer. Long-term repeated bending over can lead to occupational injuries such as lumbar muscle strain and lumbar disc herniation. At the same time, the bending-up motion prolongs the time for each material retrieval, which reduces the overall efficiency of the production line. The industry often alleviates this by reducing the number of stacked layers at a time, but this will increase the frequency of material box replacement, further reducing production efficiency. Utility Model Content
[0004] The purpose of this utility model is to provide a fixed-height trolley to solve the problem mentioned in the background art that the existing trolleys only have the functions of carrying and moving. When the materials in the upper material box are used up and removed, the lower material box will descend as the stacking height decreases, which requires employees to repeatedly bend over to retrieve the lower material. Long-term repeated bending over can lead to occupational injuries such as lumbar muscle strain and lumbar disc herniation. At the same time, the bending-standing action process prolongs the single material retrieval time, which will reduce the overall operation efficiency of the production line. The industry often alleviates this problem by reducing the number of stacking layers at a time, but this will increase the frequency of material box replacement and further reduce production efficiency.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a height-fixed trolley, comprising a trolley body, universal wheels fixedly connected to the lower surface of the trolley body, a column fixedly connected to the upper surface of the trolley body, a fixing block fixedly connected to the upper surface of the column, a handle fixedly connected to the outer surface of the column, an electric push rod fixedly connected to the upper surface of the trolley body, a bearing block fixedly connected to the upper end of the electric push rod, a damping hydraulic rod fixedly connected to the upper surface of the bearing block, a cylindrical helical tension spring sleeved on the surface of the damping hydraulic rod, a connecting block fixedly connected to the upper end of the damping hydraulic rod, a bearing plate fixedly connected to the surface of the connecting block, and an annular limiting protrusion fixedly connected to the upper surface of the bearing plate.
[0006] Preferably, the casters are arranged in four symmetrical groups on the lower surface of the trolley body.
[0007] Preferably, the columns are symmetrically distributed in four groups on the upper surface of the trolley body, and the columns cover the electric push rod, the bearing block, the damping hydraulic rod and the cylindrical helical tension spring.
[0008] Preferably, the fixing block is block-shaped, and the electric push rods are symmetrically distributed in four groups on the upper surface of the trolley body.
[0009] Preferably, the bearing block is slidably connected to the column via an electric push rod, and the damping hydraulic rod is slidably connected to the column via the bearing block, wherein the damping hydraulic rod is multi-segmented.
[0010] Preferably, the two ends of the cylindrical helical tension spring are fixedly connected to the bearing block and the connecting block, respectively. The axial direction of the cylindrical helical tension spring is parallel to the lifting direction of the bearing plate. The connecting block is slidably connected to the column through a damping hydraulic rod.
[0011] Preferably, the support plate is slidably connected to the column via a connecting block, and the annular limiting protrusions are distributed around the upper surface of the support plate.
[0012] Compared with the prior art, the beneficial effects of this utility model are: 1. Through the fixed connection between the trolley body and the electric push rod, the fixed connection between the electric push rod and the bearing block, the fixed connection between the bearing block and the damping hydraulic rod, the sleeve connection between the damping hydraulic rod and the cylindrical helical tension spring, the fixed connection between the damping hydraulic rod and the connecting block, and the fixed connection between the connecting block and the bearing plate, the elastic force provided by the cylindrical helical tension spring balances the total weight of the material boxes on the bearing plate, so that the uppermost material box on the bearing plate is always kept at the preset height. When at least one layer of material boxes is removed from the bearing plate, the elastic force of the cylindrical helical tension spring will drive the bearing plate to move upward until the uppermost material box returns to the preset height. This eliminates the need for employees to bend over throughout the process, keeps the material picking height constant, and reduces the risk of lumbar muscle strain for employees.
[0013] 2. Through the fixed connection between the trolley body and the casters, the fixed connection between the bearing block and the damping hydraulic rod, the sleeve connection between the damping hydraulic rod and the cylindrical helical tension spring, and the fixed connection between the bearing plate and the annular limiting protrusion, the damping hydraulic rod buffer can prevent the material box from tipping over due to the rapid rise and fall of the bearing plate, the annular limiting protrusion can prevent the material box from slipping, and the braking mechanism of the casters ensures the stability of the trolley during operation. Moreover, this new type can adapt to different stacking layers and meet the needs of various production lines. This new type has no complicated electrical control system and has a low failure rate. Attached Figure Description
[0014] Figure 1 This is a three-dimensional front view of the structure of this utility model; Figure 2 This is a side-view perspective view of the structure of this utility model; Figure 3 This is a partial three-dimensional structural diagram of the trolley body of this utility model; Figure 4 This is a partial three-dimensional schematic diagram of the height-fixing mechanism of this utility model; Figure 5 This is a three-dimensional partial sectional view of the height-fixing mechanism of this utility model; Figure 6 This is a partial three-dimensional schematic diagram of the bearing plate of this utility model.
[0015] In the diagram: 1. Trolley body; 2. Casters; 3. Column; 4. Fixing block; 5. Handle; 6. Electric push rod; 7. Bearing block; 8. Damping hydraulic rod; 9. Cylindrical helical tension spring; 10. Connecting block; 11. Bearing plate; 12. Annular limiting protrusion. Detailed Implementation
[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0017] Please see Figure 1-6 One embodiment provided by this utility model: A height-fixed trolley includes a trolley body 1 for carrying and transporting material boxes. A caster wheel 2 is fixedly connected to the lower surface of the trolley body 1, enabling the trolley body 1 to move. A braking mechanism is provided on the caster wheel 2 to lock its rotational state, ensuring stability during trolley operation. The caster wheel 2 is an existing product and is not considered a technical protection point of this application; therefore, it will not be described in detail here. A column 3 is fixedly connected to the upper surface of the trolley body 1, and a fixing block 4 is fixedly connected to the upper surface of the column 3. The fixing block 4 is used to lock the maximum height that the support plate 11 can rise. The outer surface of the column 3... A handle 5 is fixedly connected to the trolley body 1, which facilitates the worker in pushing the trolley. An electric push rod 6 is fixedly connected to the upper surface of the trolley body 1. The electric push rod 6 is used to push the support block 7 upward, thereby adjusting the extension length of the cylindrical helical tension spring 9, which can accommodate material boxes of various weights. The electric push rod 6 is an existing product and is not considered a technical protection point of this application, so it will not be described in detail here. The upper end of the electric push rod 6 is fixedly connected to the support block 7, which is used to support the damping hydraulic rod 8 and the cylindrical helical tension spring 9. The upper surface of the support block 7 is fixedly connected to the damping hydraulic rod 8, which is used to support the damping hydraulic rod 8 and the cylindrical helical tension spring 9. The lifting and lowering process of the support plate 11 provides buffer damping to slow down the lifting and lowering speed of the support plate 11 and prevent the material box from shaking. The damping hydraulic rod 8 is an existing product and is not considered a technical protection point of this application, so it will not be described in detail here. A cylindrical helical tension spring 9 is sleeved on the surface of the damping hydraulic rod 8. The cylindrical helical tension spring 9 is used to provide an elastic force that balances the total weight of the material boxes on the support plate 11, so that the uppermost material box on the support plate 11 is always kept at a preset height. When at least one layer of material box is removed from the support plate 11, the elastic force of the cylindrical helical tension spring 9 will drive the support plate 11 to move upward until the uppermost layer is removed. The material box is restored to the preset height, so that employees do not need to bend over during the whole process. The material picking height is constant, which can reduce the risk of lumbar muscle strain for employees. The stiffness coefficient of the cylindrical helical tension spring 9 is preset according to the weight of a single material box and the maximum number of stacked layers. The upper end of the damping hydraulic rod 8 is fixedly connected to the connecting block 10. The connecting block 10 is used to connect the cylindrical helical tension spring 9 and the bearing plate 11. The surface of the connecting block 10 is fixedly connected to the bearing plate 11. The bearing plate 11 is used to support the material box. The upper surface of the bearing plate 11 is fixedly connected to the annular limiting protrusion 12. The annular limiting protrusion 12 is used to limit the horizontal displacement of the material box on the bearing plate 11.
[0018] Furthermore, the trolley body 1 is used to carry and transport material boxes. The casters 2 are symmetrically distributed in four groups on the lower surface of the trolley body 1. The casters 2 are used to enable the trolley body 1 to move. The casters 2 are equipped with a braking mechanism to lock the rotation state of the casters 2 and ensure the stability of the trolley during operation. The casters 2 are existing products and are not considered as a technical protection point of this application. Therefore, they will not be described in detail here.
[0019] Furthermore, the columns 3 are symmetrically distributed in four groups on the upper surface of the trolley body 1, and the columns 3 cover the outside of the electric push rod 6, the bearing block 7, the damping hydraulic rod 8 and the cylindrical helical tension spring 9.
[0020] Furthermore, the fixing block 4 is block-shaped and is used to lock the maximum height that the support plate 11 can rise. The handle 5 is used to facilitate the workers to push the trolley. The electric push rods 6 are symmetrically distributed in four groups on the upper surface of the trolley body 1. The electric push rods 6 are used to push the support block 7 upward, thereby adjusting the extension length of the cylindrical helical tension spring 9, which can then adapt to material boxes of various weights. The electric push rods 6 are existing products and are not considered as technical protection points of this application, so they will not be described in detail here.
[0021] Furthermore, the bearing block 7 is slidably connected to the column 3 via the electric push rod 6. The bearing block 7 is used to support the damping hydraulic rod 8 and the cylindrical helical tension spring 9. The damping hydraulic rod 8 is slidably connected to the column 3 via the bearing block 7. The damping hydraulic rod 8 is multi-segmented. The damping hydraulic rod 8 is used to provide buffer damping during the lifting and lowering of the bearing plate 11, thereby slowing down the lifting and lowering speed of the bearing plate 11 and preventing the material box from shaking. The damping hydraulic rod 8 is an existing product and is not considered a technical protection point of this application. Therefore, it will not be described in detail here.
[0022] Furthermore, the two ends of the cylindrical helical tension spring 9 are fixedly connected to the bearing block 7 and the connecting block 10, respectively. The axial direction of the cylindrical helical tension spring 9 is parallel to the lifting direction of the bearing plate 11. The cylindrical helical tension spring 9 is used to provide an elastic force that balances the total weight of the material boxes on the bearing plate 11, so that the uppermost material box on the bearing plate 11 is always kept at a preset height. When at least one layer of material box is removed from the bearing plate 11, the elastic force of the cylindrical helical tension spring 9 will drive the bearing plate 11 to move upward until the uppermost material box returns to the preset height. This eliminates the need for employees to bend over throughout the process, and the material retrieval height is constant, which can reduce the risk of lumbar muscle strain for employees. The stiffness coefficient of the cylindrical helical tension spring 9 is preset according to the weight of a single material box and the maximum number of stacked layers. The connecting block 10 is slidably connected to the column 3 through the damping hydraulic rod 8. The connecting block 10 is used to connect the cylindrical helical tension spring 9 and the bearing plate 11.
[0023] Furthermore, the support plate 11 is slidably connected to the column 3 via the connecting block 10. The support plate 11 is used to support the material box. The annular limiting protrusions 12 are distributed around the upper surface of the support plate 11. The annular limiting protrusions 12 are used to limit the horizontal displacement of the material box on the support plate 11.
[0024] Working principle: Empty material boxes are stacked layer by layer on the support plate 11. The total weight of the support plate 11 increases, and the cylindrical spiral tension spring 9 is compressed until the height of the top material box drops to the preset material retrieval height. At this time, the elastic force of the cylindrical spiral tension spring 9 is balanced with the total weight. The employee takes the material from the top material box. After the material in that layer is used up, the empty box is removed. The total weight of the support plate 11 decreases, and the elastic force of the cylindrical spiral tension spring 9 is greater than the remaining weight, which drives the support plate 11 to rise vertically until the new top material box returns to the preset height, realizing automatic height compensation. During the lifting and lowering process of the support plate 11, the damping hydraulic rod 8 provides buffer resistance through internal damping oil, so that the lifting and lowering speed of the support plate 11 is low and the material box is prevented from tilting.
[0025] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.
Claims
1. A leveling bogie comprising a bogie body (1), characterized in that: The lower surface of the trolley body (1) is fixedly connected with casters (2), the upper surface of the trolley body (1) is fixedly connected with a column (3), the upper surface of the column (3) is fixedly connected with a fixing block (4), the outer surface of the column (3) is fixedly connected with a handle (5), the upper surface of the trolley body (1) is fixedly connected with an electric push rod (6), the upper end of the electric push rod (6) is fixedly connected with a bearing block (7), the upper surface of the bearing block (7) is fixedly connected with a damping hydraulic rod (8), the surface of the damping hydraulic rod (8) is sleeved with a cylindrical helical tension spring (9), the upper end of the damping hydraulic rod (8) is fixedly connected with a connecting block (10), the surface of the connecting block (10) is fixedly connected with a bearing plate (11), and the upper surface of the bearing plate (11) is fixedly connected with an annular limiting protrusion (12).
2. A leveling platform according to claim 1, characterized in that: The universal wheels (2) are symmetrically distributed in four groups on the lower surface of the trolley body (1).
3. The leveling platform of claim 1, wherein: The columns (3) are symmetrically distributed in four groups on the upper surface of the trolley body (1). The columns (3) are covered by the electric push rod (6), the bearing block (7), the damping hydraulic rod (8) and the cylindrical helical tension spring (9).
4. The leveling platform of claim 1, wherein: The fixed block (4) is block-shaped, and the electric push rods (6) are symmetrically distributed in four groups on the upper surface of the trolley body (1).
5. The leveling platform of claim 1, wherein: The bearing block (7) is slidably connected to the column (3) via the electric push rod (6), and the damping hydraulic rod (8) is slidably connected to the column (3) via the bearing block (7). The damping hydraulic rod (8) is multi-segmented.
6. A leveling platform according to claim 1, wherein: The two ends of the cylindrical helical tension spring (9) are fixedly connected to the bearing block (7) and the connecting block (10) respectively. The axial direction of the cylindrical helical tension spring (9) is parallel to the lifting direction of the bearing plate (11). The connecting block (10) is slidably connected to the column (3) through the damping hydraulic rod (8).
7. The leveling platform of claim 1, wherein: The support plate (11) is slidably connected to the column (3) via the connecting block (10), and the annular limiting protrusion (12) is distributed around the upper surface of the support plate (11).