Elevator using a rack and pinion transmission

Abstract

The application provides a lifting machine applying a gear and rack transmission structure and belongs to the field of logistics storage. A driving gear on one side of a loading platform and a rack on one side of a stand column form a lifting transmission mechanism, so as to improve transmission precision, realize accurate butt joint of the lifting machine and a goods shelf, and completely solve the existing defects that the loading platform is prone to subsidence when goods or a shuttle vehicle enters or exits the lifting machine. The lifting machine comprises a base assembly, a stand column frame assembly is fixedly connected to the base assembly, a plurality of counterweight chains and a counterweight assembly are arranged on the inner side of the stand column frame assembly, a loading platform assembly is vertically connected and runs in the stand column frame assembly, and a top frame assembly is arranged on the top of the stand column frame assembly.

Description

Technical Field

[0001] This application pertains to the field of logistics and warehousing, specifically proposing a hoist that utilizes a gear and rack transmission structure to enable cargo and / or four-way shuttle layer-changing operations. Background Technology

[0002] Currently, various lifting devices are commonly used in the logistics and warehousing industry to facilitate the transfer of goods between adjacent conveyor systems and the transportation of goods in and out of warehouses. With the rapid development of e-commerce and conveyor automation technology, the scale of logistics transfer centers is increasing. As a key piece of equipment in automated warehouses for goods entry and exit and four-way shuttle transfers, the elevator's ability to safely, conveniently, and accurately transport goods or four-way shuttles to designated levels has become a crucial element of automated warehouses.

[0003] The most common types of hoists currently used are chain hoists or wire rope hoists. These hoists employ flexible connections. Due to the tensile strength of the chains and wire ropes, they will elongate after a period of operation, resulting in a height difference when the hoist connects with the racking inside the automated warehouse. Furthermore, changes in load when goods enter or exit the hoist cause further stretching of the chains and wire ropes, again leading to a height difference when connecting with the racking. This height difference can obstruct the movement of goods or four-way shuttles, or even prevent them from entering or exiting the hoist, and may even cause goods to fall. Additionally, the drive motors of these hoists are usually installed at the top of the hoist. For ease of maintenance, safety railings are typically installed at the top, which occupies considerable overhead space, reducing the utilization rate of the warehouse's vertical space.

[0004] In view of the above, this patent application is hereby filed. Utility Model Content

[0005] The lifting machine using a gear and rack transmission structure described in this application aims to solve the problems existing in the prior art by forming a lifting transmission mechanism through a drive gear on one side of the loading platform and a rack on one side of the column. This is intended to improve transmission accuracy, achieve precise docking between the lifting machine and the rack, and completely solve the existing defect that the loading platform is prone to sinking when goods or shuttle cars enter or exit the lifting machine.

[0006] To achieve the above design objectives, the lifting machine using a gear and rack transmission structure includes a base assembly, a column frame assembly fixedly connected to the base assembly, an array of counterweight chains and counterweight components arranged inside the column frame assembly, a loading platform assembly running vertically connected to the column frame assembly, and a top frame assembly arranged on top of the column frame assembly; the loading platform assembly includes a loading platform frame, a set of cargo conveying lines and two shuttle tracks are horizontally arranged on the loading platform frame, movable obstructions are provided at the ends of the shuttle tracks to prevent cargo from rushing out along the cargo conveying lines, an array of loading platform guide wheels are provided on the sides of the loading platform frame to provide vertical lifting guidance, and a set of loading platform drive assemblies are respectively arranged at the four corners of the loading platform frame.

[0007] Furthermore, the loading platform drive assembly includes a drive assembly mounting frame that is installed and connected to the loading platform frame. A reducer and a servo motor connected in series are mounted on the drive assembly mounting frame. The output end of the reducer passes through the drive assembly mounting frame and a gear fixed by a tensioning sleeve is provided on the output shaft of the reducer.

[0008] Furthermore, the drive assembly mounting bracket is provided with an elongated oval adjustment hole that allows the horizontal mounting position to be adjusted by bolts.

[0009] Furthermore, the bottom of the drive component fixing frame is provided with a guide groove, and bosses are provided at the four corners of the loading platform frame, with the guide groove and the bosses engaging in a mating fit.

[0010] Furthermore, the base assembly includes a welded frame, and at the top of the four corners of the welded frame, there are respectively a lower limit buffer block for supporting the loading platform assembly and a loading platform positioning pin for horizontal positioning of the loading platform assembly.

[0011] Furthermore, leveling feet are provided at the bottom of the four corners of the welded frame, and an array of counterweight buffers are provided on the welded frame to buffer the lifting and lowering of the loading platform assembly.

[0012] Furthermore, the column frame assembly includes an array of vertically arranged columns assembled from multiple sets of bent sheet metal structures. A first horizontal brace, a second horizontal brace, and a diagonal brace are respectively connected between adjacent columns in the horizontal or longitudinal direction. Column connectors are fixed at the adjacent bent sheet metal structure assembly points that make up each set of columns, and racks are connected vertically along the columns.

[0013] Furthermore, the column includes a bent sheet metal part, and a group of column stiffeners are laterally connected inside the bend of the bent sheet metal part; process holes for connecting the first cross brace, the second cross brace and the diagonal brace are evenly provided along the side of each group of columns at intervals of 40 to 80 mm.

[0014] Furthermore, the top frame includes a top frame on which an array of single sprocket assemblies and double sprocket assemblies are provided. An array of counterweight chains are respectively wound around the single sprocket assemblies and double sprocket assemblies. One end of the counterweight chain is connected to the loading platform frame, and the other end is connected to the counterweight assembly.

[0015] Furthermore, the counterweight assembly includes two sets of counterweight guide rails assembled from several guide rails with hollow structures. Each set of counterweight guide rails is vertically installed on the column via an array of guide rail fixing frames. A guide rail connecting plate is fixed between two adjacent guide rails in each set of counterweight guide rails. An array of counterweight guide wheel assemblies for movably connecting to the inner side of the counterweight guide rails is installed on the side of the counterweight frame on which the counterweight plates are installed. A counterweight chain rod for connecting the counterweight chain is installed on the top of the counterweight frame.

[0016] In summary, the hoist employing a gear and rack transmission structure has the following advantages and beneficial effects:

[0017] 1. This application adopts a 4-axis servo drive assembly with gear and rack transmission to realize the lifting and lowering movement of the loading platform. Compared with the existing chain or wire rope structure, it can completely solve the problem of loading platform settlement.

[0018] 2. The lifting mechanism of the cargo platform proposed in this application adopts a gear and rack structure, which has higher transmission accuracy and better stability compared with the existing chain or wire rope structures.

[0019] 3. The 4-axis servo drive structure with gear and rack transmission proposed in this application has the power fixed on the upper part of the loading platform frame. Compared with the existing chain-type hoist structure where the power is fixed on the top frame, it can better save the top space of the hoist and improve the space utilization rate.

[0020] 4. The hoist proposed in this application, lacking a power mechanism at the top, eliminates the need for guardrails and ladders, resulting in a simpler overall structure. Furthermore, it utilizes bent sheet metal columns with internally welded reinforcing ribs to enhance strength. Multiple arrays of process holes are spaced along the sides of the columns, allowing for the installation of fixed horizontal and diagonal braces according to different project heights, and enabling the columns to be spliced ​​based on the total project height. Compared to existing technologies, this structure offers higher modularity, simpler installation and commissioning processes, and lower costs. Attached Figure Description

[0021] The present application will now be further described in conjunction with the following figures;

[0022] Figure 1 This is the assembly drawing of the hoist using the gear and rack transmission structure described in this application;

[0023] Figure 2 This is a structural diagram of the base assembly;

[0024] Figure 3 This is a structural diagram of the loading platform assembly;

[0025] Figure 4 This is a structural diagram of the column frame assembly;

[0026] Figure 5 This is a structural diagram of the top frame component;

[0027] Figure 6 This is a structural diagram of the counterweight assembly;

[0028] Figure 7 This is a structural diagram of the column;

[0029] Figure 8 and Figure 9 These are structural schematic diagrams of the cargo platform drive component from different perspectives;

[0030] In the above figures, 1. Base assembly, 2. Cargo platform assembly, 3. Column frame assembly, 4. Top frame assembly, 5. Counterweight assembly, 6. Counterweight chain; 11. Welded frame, 12. Leveling foot, 13. Lower limit buffer block of cargo platform, 14. Cargo platform positioning pin, 15. Counterweight buffer; 21. Cargo platform frame, 22. Cargo conveyor line, 23. Cargo platform guide wheel, 24. Cargo platform drive assembly, 25. Shuttle track, 26. Movable stop; 31. Column, 32. First cross brace, 33. Second cross brace, 34. Diagonal brace, 35. Column connecting plate, 3 6. Rack and pinion; 37. Upper limit stop; 38. Protective net; 41. Top frame; 42. Single sprocket assembly; 43. Double sprocket assembly; 51. Counterweight guide rail; 52. Guide rail fixing bracket; 53. Guide rail connecting plate; 54. Counterweight frame; 55. Counterweight plate; 56. Counterweight guide wheel assembly; 57. Counterweight chain tie rod; 241. Drive component fixing bracket; 242. Reducer; 243. Servo motor; 244. Gear; 245. Expansion sleeve; 246. Motor cover; 247. Gear cover; 248. Guide groove; 311. Bending sheet metal part; 312. Column stiffener plate. Detailed Implementation

[0031] Example 1, such as Figures 1 to 9 As shown, this application proposes a novel hoist using a gear and rack transmission structure, including a base assembly 1, a column frame assembly 3 fixedly connected to the base assembly 1, an array of counterweight chains 6 and counterweight components 5 arranged inside the column frame assembly 3, a loading platform assembly 2 vertically connected to and running on the column frame assembly 3, and a top frame assembly 4 arranged on top of the column frame assembly 3. Specifically,

[0032] The base assembly 1 includes a welded frame 11, with a lower limit buffer block 13 for supporting the loading platform assembly 2 and a loading platform positioning pin 14 for horizontal positioning of the loading platform assembly 2 respectively provided at the top of the four corners of the welded frame 11; leveling feet 12 are provided at the bottom of the four corners of the welded frame 11; and a series of counterweight buffers 15 are provided on the welded frame 11 for buffering the lifting and lowering of the loading platform assembly 2.

[0033] The loading platform assembly 2 includes a loading platform frame 21 installed and connected to the welded frame 11. A set of cargo conveying lines 22 and two shuttle car guide rails 25 are horizontally arranged on the loading platform frame 21. Movable blocks 26 are provided at the ends of the shuttle car rails 25 to prevent cargo from rushing out along the cargo conveying lines 22. An array of loading platform guide wheels 23 are provided on the side of the loading platform frame 21 to provide vertical lifting guidance. The contact distance between the loading platform guide wheels 23 and the column 31 is adjusted relative to each other by adjusting bolts. A set of loading platform drive assemblies 24 are respectively provided at the four corners of the loading platform frame 21.

[0034] The loading platform drive assembly 24 includes a drive assembly mounting frame 241 that is installed and connected to the loading platform frame 21. A reducer 242 and a servo motor 243 connected in series are mounted on the drive assembly mounting frame 241. A motor cover 246 connected to the drive assembly mounting frame 241 is provided outside the reducer 242 and the servo motor 243. The output end of the reducer 242 passes through the drive assembly mounting frame 241 and a gear 244 is provided on the output shaft of the reducer 242 by a tensioning sleeve 245. A gear cover 247 connected to the drive assembly mounting frame 241 is provided outside the gear 244.

[0035] The drive assembly mounting bracket 241 is provided with an elongated oval adjustment hole that can be adjusted by bolts to adjust its horizontal installation position, thereby facilitating the adjustment of the meshing tension between the gear 244 and the rack 36; the tightening sleeve 245 fixes the gear 244 to ensure that the gear 244 and the corresponding rack mesh accurately during assembly, and can ensure that they have the same initial meshing force, avoiding the problem of repeatedly adjusting the meshing angle between the gear and the rack during assembly.

[0036] The drive component fixing frame 241 is provided with a guide groove 248 at the bottom and a boss is provided at the four corners of the loading platform frame 21. The guide groove 248 and the boss are engaged to ensure that the loading platform drive component 24 will not deflect during adjustment.

[0037] The column frame assembly 3 includes an array of vertically arranged columns 31 assembled from multiple sets of bent sheet metal structures. A first horizontal brace 32, a second horizontal brace 33, and a diagonal brace 34 are connected between adjacent columns 31 in the horizontal or longitudinal direction. A column connector 35 is fixedly connected at the adjacent bent sheet metal structure assembly points that make up each set of columns 31. A rack 36 is connected vertically along the column 31. An upper limit stop 37 is provided at the vertical top of the column 31. Multiple sets of protective nets 38 are provided on the sides and back of the column frame assembly 3.

[0038] The column 31 with the bent sheet metal structure includes a bent sheet metal part 311, and an array of column stiffeners 312 are horizontally connected inside the bend of the bent sheet metal part 311.

[0039] Process holes for connecting the first horizontal brace 32, the second horizontal brace 33 and the diagonal brace 34 are evenly provided at intervals of 40 to 80 mm along the side of each set of columns 31, so as to install and fix the horizontal brace and diagonal brace according to different floor heights of the project, and to splice the columns according to the total height of different projects. The columns of this structure are more modular than traditional columns.

[0040] The top frame 4 includes a top frame 41 that is fixedly connected to the top of the array columns 31. An array of single sprocket assemblies 42 and double sprocket assemblies 43 are provided on the top frame 41. An array of counterweight chains 6 are respectively wound around the single sprocket assembly 42 and the double sprocket assembly 43. One end of the counterweight chain 6 is connected to the loading platform frame 21 of the loading platform assembly 2, and the other end is connected to the counterweight assembly 5.

[0041] The counterweight assembly 5 includes two sets of counterweight guide rails 51 assembled from several guide rails with hollow structures. Each set of counterweight guide rails 51 is vertically mounted on the column 31 via an array of guide rail fixing brackets 52. A guide rail connecting plate 53 is fixedly connected between two adjacent guide rails in each set of counterweight guide rails 51. An array of counterweight guide wheel assemblies 56 for movably connecting to the inner side of the counterweight guide rails 51 is installed on the side of the counterweight frame 54 on which the counterweight plate 55 is installed. A counterweight chain rod 57 for connecting the counterweight chain 6 is installed on the top of the counterweight frame 54.

[0042] The embodiments described above, in conjunction with the accompanying drawings, are merely preferred solutions for achieving the objectives of this utility model. Those skilled in the art can draw inspiration from this and directly derive other alternative structures that conform to the design concept of this utility model. Other structural features derived therefrom should also fall within the scope of the solutions described in this utility model.

Claims

1. A hoist employing a gear and rack transmission structure, characterized in that: It includes a base assembly, a column frame assembly fixedly connected to the base assembly, an array of counterweight chains and counterweight components inside the column frame assembly, a loading platform assembly running vertically connected to the column frame assembly, and a top frame assembly on top of the column frame assembly. The loading platform assembly includes a loading platform frame, on which a cargo conveyor line and two shuttle tracks are horizontally arranged. At the ends of the shuttle tracks, movable barriers are provided to prevent cargo from being pushed out of the conveyor line. On the sides of the loading platform frame, an array of loading platform guide wheels are provided to provide vertical lifting guidance. At the four corners of the loading platform frame, a set of loading platform drive components are respectively provided.

2. The hoist using a gear and rack transmission structure according to claim 1, characterized in that: The loading platform drive assembly includes a drive assembly mounting frame that is installed and connected to the loading platform frame. A reducer and a servo motor are mounted in series on the drive assembly mounting frame. The output end of the reducer passes through the drive assembly mounting frame and a gear is fixed on the output shaft of the reducer by a tensioning sleeve.

3. The hoist using a gear and rack transmission structure according to claim 2, characterized in that: The drive assembly mounting bracket is provided with an elongated oval adjustment hole that allows the horizontal position of the mounting to be adjusted by bolts.

4. The hoist using a gear and rack transmission structure according to claim 2, characterized in that: The drive component mounting frame has a guide groove at the bottom and bosses at the four corners of the loading platform frame. The guide groove and the bosses are engaged.

5. The hoist using a gear and rack transmission structure according to claim 1 or 2, characterized in that: The base assembly includes a welded frame, and at the top of the four corners of the welded frame, there are respectively a lower limit buffer block for supporting the loading platform assembly and a loading platform positioning pin for horizontal positioning of the loading platform assembly.

6. The hoist using a gear and rack transmission structure according to claim 5, characterized in that: Leveling feet are provided at the bottom of the four corners of the welded frame, and an array of counterweight buffers are provided on the welded frame to buffer the lifting and lowering of the loading platform assembly.

7. The hoist using a gear and rack transmission structure according to claim 1 or 2, characterized in that: The column frame assembly includes an array of vertically arranged columns assembled from multiple sets of bent sheet metal structures. A first horizontal brace, a second horizontal brace, and a diagonal brace are connected between adjacent columns in the horizontal or longitudinal direction. Column connectors are fixed at the adjacent bent sheet metal structure assembly points that make up each set of columns, and racks are connected vertically along the columns.

8. The hoist using a gear and rack transmission structure according to claim 7, characterized in that: The column includes a bent sheet metal part, and a number of column stiffeners are horizontally connected inside the bend of the bent sheet metal part; Process holes for connecting the first horizontal brace, the second horizontal brace, and the diagonal brace are evenly provided at intervals of 40 to 80 mm along the side of each set of columns.

9. The hoist using a gear and rack transmission structure according to claim 1 or 2, characterized in that: The top frame includes a top frame on which an array of single sprocket assemblies and double sprocket assemblies are provided. An array of counterweight chains are respectively wound around the single sprocket assemblies and double sprocket assemblies. One end of the counterweight chain is connected to the loading platform frame, and the other end is connected to the counterweight assembly.

10. The hoist using a gear and rack transmission structure according to claim 1 or 2, characterized in that: The counterweight assembly includes two sets of counterweight guide rails assembled from several guide rails with hollow structures. Each set of counterweight guide rails is vertically installed on the column via an array of guide rail fixing frames. A guide rail connecting plate is fixed between two adjacent guide rails in each set of counterweight guide rails. An array of counterweight guide wheel assemblies for movably connecting to the inner side of the counterweight guide rails is installed on the side of the counterweight frame on which the counterweight plates are installed. A counterweight chain tie rod for connecting the counterweight chain is installed on the top of the counterweight frame.

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