Auxiliary tray for loading parts on sensor assembly table

By designing protective baffle components and corner protectors on the auxiliary tray of the sensor assembly table, the problem of protecting parts while waiting is solved, ensuring the stability of parts and improving production efficiency and assembly success rate.

CN224563065UActive Publication Date: 2026-07-28SHANGHAI QINGYING AUTOMATION EQUIPMENT CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
SHANGHAI QINGYING AUTOMATION EQUIPMENT CO LTD
Filing Date
2025-09-29
Publication Date
2026-07-28

AI Technical Summary

Technical Problem

During sensor assembly, components lack effective protection while waiting on the tray, making them susceptible to accidental touches or scratches, which can cause them to change position, affecting subsequent automated assembly and reducing production efficiency.

Method used

A component loading auxiliary tray for a sensor assembly station was designed. It adopts a protective baffle assembly and corner protection sleeves. Through the cooperation of limit blocks and reset springs, it ensures that the components remain stable on the tray, prevents them from sliding and falling, and provides effective protection.

Benefits of technology

This improves the practicality and reliability of the pallet, avoids changes in the position of parts, and greatly improves production efficiency and assembly success rate.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a spare parts loading auxiliary tray of sensor assembly platform relates to work technical field. Spare parts loading auxiliary tray of sensor assembly platform, including auxiliary tray main part and four edge angle protection sleeve, be provided with four protection baffle subassembly on auxiliary tray main part, and protection baffle subassembly includes protection baffle and two protection shell, and the outside wall of two protection shell near protection baffle is all seted up with second limit block groove, and the inside of two second limit block grooves all are connected with limit block in sliding, and the vertical state of protection baffle is kept under the action of limit block through protection baffle subassembly protection baffle, and four protection baffles form a closed area around auxiliary tray main part, prevent spare parts on the tray and slide and fall, like this effectively improved the practicality and reliability of auxiliary tray main part, avoided the spare parts on auxiliary tray main part possibly touching a little bit carelessly simultaneously, and then greatly improved production efficiency.
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Description

Technical Field

[0001] This utility model relates to the field of work technology, and in particular to a component loading auxiliary tray for a sensor assembly station. Background Technology

[0002] In modern industrial systems, sensors, with their ability to accurately perceive and convert various physical, chemical, and biological quantities, have become the cornerstone for intelligent and automated operation in many fields. From real-time monitoring of engine conditions and vehicle driving status in automobile manufacturing, to controlling production equipment operating parameters and material characteristics in industrial automation scenarios, and to regulating indoor temperature, humidity, and air quality in the smart home field, sensors are ubiquitous. With the acceleration of digital transformation in various industries, the demand for sensors has exploded, and unprecedentedly high requirements have been placed on their performance indicators such as accuracy, stability, and reliability. This necessitates continuous innovation in sensor manufacturing processes to adapt to the stringent market demands.

[0003] In the entire sensor production process, the assembly stage is the core stage to ensure product quality and performance. This stage requires the assembly of numerous precision components, such as chips, capacitors, resistors, and housings, according to precise process requirements. Any slight deviation may lead to a decrease in sensor performance or even failure. As a key carrier for material transportation and temporary storage in the assembly stage, the rationality of the design and functionality of the component loading auxiliary tray directly affects the efficiency and quality of the assembly operation.

[0004] During sensor assembly, components need to wait on a pallet for a certain period of time before entering the subsequent assembly station. During this period, if the pallet lacks effective protection, the components are easily touched or scratched by accidents. In a collaborative production environment, operators may accidentally touch the components on the pallet while performing other production tasks, causing their positions to change. This will undoubtedly interfere with the subsequent gripping and assembly operations of the automated assembly equipment, and in severe cases, may even lead to assembly failure, requiring reloading and repositioning, which greatly reduces production efficiency. Utility Model Content

[0005] The purpose of this utility model is to at least solve one of the technical problems existing in the prior art by providing a component loading auxiliary tray for a sensor assembly station. This solves the problem that during the sensor assembly process, components need to wait on the tray for a certain period of time before entering the subsequent assembly station. During this period, if the tray lacks effective protection, the components are easily touched or scratched by accidents. In a multi-person collaborative production environment, operators may accidentally touch the components on the tray while performing other production tasks, causing their positions to change. This will undoubtedly interfere with the subsequent gripping and assembly operations of the automated assembly equipment, and in severe cases, may even lead to assembly failure, requiring reloading and repositioning, which greatly reduces production efficiency.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a component loading auxiliary tray for a sensor assembly table, comprising an auxiliary tray body and four corner protective sleeves, wherein the auxiliary tray body is provided with four protective baffle assemblies; The protective baffle assembly includes a protective baffle and two protective shells. A protective pad is provided on one outer wall of the protective baffle. A sliding rod is slidably connected to the outer wall of each of the two protective shells. A second limiting block groove is opened on the outer wall of each of the two protective shells near the protective baffle. A limiting block is slidably connected inside the two second limiting block grooves. Two first limiting block grooves are opened on the lower outer wall of the protective baffle. Among them, push block grooves are opened on one side of the outer wall of both protective shells, and push blocks are slidably connected inside the two push block grooves. Return springs are sleeved on the outer walls of the two slide rods, and limit blocks are locked inside the two push block grooves. Four protective baffle assemblies are set on the four sides of the auxiliary tray body.

[0007] Preferably, the two protective shells are fixedly installed on the upper surface of the corresponding protrusions of the auxiliary tray body, and the lower outer wall of the protective baffle is rotatably connected to the opposite surfaces of the two corresponding protrusions on the auxiliary tray body; In this configuration, the ends of the two limiting blocks near the first limiting block groove both slide to the outside of the second limiting block groove and are respectively slidably connected to the inside of the corresponding first limiting block groove.

[0008] Preferably, the ends of the two slide rods near the limiting block both extend slidably into the interior of the second limiting block groove and are respectively fixedly connected to the outer wall of the corresponding limiting block; The two ends of the two reset springs are fixedly connected to the outer wall of the corresponding limit block and the inside of the second limit block groove, respectively, and the inside of the two push block grooves are connected to the inside of the corresponding second limit block groove.

[0009] Preferably, the ends of the two push blocks near the limiting block slidably extend into the interior of the second limiting block groove and are respectively fixedly connected to the outer wall of the corresponding limiting block; The outer walls at both ends of the two limiting blocks are fixedly connected to the outer wall of one side of the corresponding push block and the inner wall of the push block groove, respectively.

[0010] Preferably, the upper surface of the auxiliary tray body is provided with four corner protective sleeve mounting grooves, the outer walls of the four corner protective sleeves are threaded with fixing bolts, and the lower outer walls of the four sides of the auxiliary tray body are provided with connecting grooves. The outer walls of the T-shaped blocks on the four corner protective sleeves are slidably connected to the interior of the corresponding corner protective sleeve mounting grooves.

[0011] Preferably, one inner wall of each of the four corner protective sleeves contacts the outer walls of the four corners of the auxiliary tray body. The four corner protective sleeves are installed on the four corners of the auxiliary pallet body by fixing bolts and internal threaded connections to the grooves in the corner protective sleeve installation slots. Protective pads are fixedly installed on the upper surface of the auxiliary pallet body.

[0012] Compared with the prior art, the beneficial effects of this utility model are: 1. The component loading auxiliary tray of the sensor assembly table is kept vertical by the protective baffle assembly under the action of the limit block. The four protective baffles form a closed area around the auxiliary tray body to prevent the components from sliding and falling on the tray. This effectively improves the practicality and reliability of the auxiliary tray body, and avoids the possibility of accidentally touching the components on the auxiliary tray body, thereby greatly improving production efficiency. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the external structure of the protective baffle of this utility model; Figure 3 This utility model Figure 2 A structural schematic diagram of the enlarged view at point A in the middle; Figure 4 This is a schematic diagram of the internal structure of the protective shell of this utility model.

[0014] Reference numerals in the attached drawings: 1. Auxiliary tray body; 2. Corner protection sleeve; 3. Slide rod; 4. Protective baffle; 5. Protective pad; 6. Protective shell; 7. Push block; 8. Limiting block; 9. Push block groove; 10. Corner protection sleeve mounting groove; 11. Fixing bolt; 12. First limiting block groove; 13. Limiting block; 14. Return spring; 15. Second limiting block groove. Detailed Implementation

[0015] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0016] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0017] In the description of this utility model, terms such as greater than, less than, and exceeding are understood to exclude the stated number, while terms such as above, below, and within are understood to include the stated number. The use of terms like "first" and "second" is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the quantity or sequence of the indicated technical features.

[0018] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0019] Please see Figure 1-4 This utility model provides a technical solution: a component loading auxiliary tray for a sensor assembly table, comprising an auxiliary tray body 1 and four corner protective sleeves 2; The auxiliary tray body 1 is equipped with four protective baffle assemblies; The protective baffle assembly includes a protective baffle 4 and two protective shells 6. The two protective shells 6 are fixedly installed on the upper surface of the corresponding protrusions on the auxiliary tray body 1. A protective pad is provided on one outer wall of the protective baffle 4. Sliding rods 3 are slidably connected to the outer walls of both protective shells 6. The lower outer wall of the protective baffle 4 is rotatably connected to the opposite surfaces of the two corresponding protrusions on the auxiliary tray body 1. The outer wall of each of the two protective shells 6 near the protective baffle 4 is provided with a second limiting block groove 15. Limiting blocks 13 are slidably connected inside the two second limiting block grooves 15. The lower outer wall of the protective baffle 4 is provided with two first limiting block grooves 12. The ends of the two limiting blocks 13 near the first limiting block grooves 12 are slidably extended to the outside of the second limiting block grooves 15 and are slidably connected to the inside of the corresponding first limiting block grooves 12. The ends of the two sliding rods 3 near the limiting blocks 13 are slidably extended to the second limiting block grooves. The interior of the two protective shells 6 is fixedly connected to the outer wall of the corresponding limiting block 13. The outer wall of each of the two protective shells 6 is provided with a push block groove 9. The interior of each of the two push block grooves 9 is slidably connected with a push block 7. The outer wall of each of the two slide rods 3 is sleeved with a return spring 14. The two ends of the two return springs 14 are fixedly connected to the outer wall of the corresponding limiting block 13 and the interior of the second limiting block groove 15. The interior of each of the two push block grooves 9 is connected to the interior of the corresponding second limiting block groove 15. The end of each of the two push blocks 7 near the limiting block 13 is slidably extended into the interior of the second limiting block groove 15 and is fixedly connected to the outer wall of the corresponding limiting block 13. The interior of each of the two push block grooves 9 is engaged with a limiting block 8. The outer walls of the two ends of the limiting block 8 are fixedly connected to the outer wall of one side of the corresponding push block 7 and the inner wall of the push block groove 9. The four protective baffle assemblies are set on the four sides of the auxiliary tray body 1.

[0020] The auxiliary tray body 1 has four corner protection sleeve mounting grooves 10 on its upper surface. The outer walls of the four corner protection sleeves 2 are threaded with fixing bolts 11. The lower outer walls of the four sides of the auxiliary tray body 1 are provided with connecting grooves. The outer walls of the T-shaped blocks on the four corner protection sleeves 2 are slidably connected to the interior of the corresponding corner protection sleeve mounting grooves 10. The inner wall of one side of the four corner protection sleeves 2 is in contact with the outer walls of the four corners of the auxiliary tray body 1. The four corner protection sleeves 2 are installed on the four corners of the auxiliary tray body 1 by fixing bolts 11 and threaded connection to the grooves in the corner protection sleeve mounting grooves 10. A protective pad 5 is fixedly installed on the upper surface of the auxiliary tray body 1.

[0021] Furthermore, when using this device, initially, when using the component loading auxiliary tray of the sensor assembly table, the protective baffle 4 remains vertical under the action of the limiting block 13. The four protective baffles 4 form a closed area around the auxiliary tray body 1 to prevent components from sliding and falling on the tray. When loading is required, the operator manually pushes the push block 7, which slides in the push block groove 9, causing the limiting block 13 fixedly connected to it to slide along the second limiting block groove 15, so that the limiting block 13 disengages from the first limiting block groove 12 on the lower outer wall of the protective baffle 4. At this time, the protective baffle 4 loses the restriction of the limiting block 13 and can rotate around the rotation connection point of its corresponding protrusion to the auxiliary tray body 1, opening outward. After the operator places the sensor components on the upper surface of the auxiliary tray body 1, the protective baffle 4 is manually reset, and the push block 7 is released. Under the elastic force of the reset spring 14, the slide rod 3 drives the limiting block 13 to slide along the second limiting block groove 15. The positioning block 13 automatically slides back and re-engages into the first limiting block groove 12, restoring the protective baffle 4 to a vertical position and confining the parts within the pallet to prevent displacement during handling or subsequent operations. Simultaneously, during pallet handling, the four corner protective sleeves 2 tightly fit against the four corners of the auxiliary pallet body 1 and are securely fixed by the fixing bolts 11, effectively resisting the impact of external collisions, protecting the pallet corners from damage, and extending the pallet's service life. Furthermore, the protective pad on one side of the protective baffle 4 prevents direct collisions between the parts and the protective baffle 4, ensuring the quality and performance of the parts. When unloading, repeatedly pushing the push block 7 to open the protective baffle 4 allows for easy removal of the parts from the pallet. Throughout the entire loading, handling, and unloading process, the protective baffle assembly and the corner protective sleeves 2 work together, ensuring the stability and safety of the parts on the pallet while facilitating operation by the personnel.

[0022] With the protective baffle assembly, the protective baffle 4 is kept vertical under the action of the limiting block 13. The four protective baffles 4 form a closed area around the auxiliary pallet body 1, preventing parts from sliding and falling on the pallet. This effectively improves the practicality and reliability of the auxiliary pallet body 1, and avoids the possibility of accidentally touching the parts on the auxiliary pallet body 1, thereby greatly improving production efficiency.

[0023] Structural Description: Auxiliary Tray Body 1: As the core load-bearing component of the entire loading auxiliary tray, its upper surface is used to place the sensor components to be loaded. Four corner protective sleeve mounting slots 10 are opened on the upper surface of the auxiliary tray body 1 for installing corner protective sleeves 2. The lower outer wall of the four sides is provided with connecting slots to provide installation interfaces when connecting with other equipment or structures. At the same time, the protrusions at the corresponding positions provide support for the installation of the protective baffle assembly. Corner Protection Sleeve 2: There are four corner protection sleeves 2 in total. The outer wall of the sleeve is provided with threaded holes. The sleeves are connected to the corner protection sleeve mounting groove 10 on the auxiliary pallet body 1 by fixing bolts 11. The outer wall of the T-shaped block on the corner protection sleeve 2 slides in fit with the inside of the corner protection sleeve mounting groove 10 to ensure the stability and accuracy of the installation. After installation, one inner wall of the sleeve is in close contact with the outer walls of the four corners of the auxiliary pallet body 1, which can effectively protect the four corners of the pallet and prevent damage caused by collision during handling and loading. Slide rod 3: Each protective baffle assembly includes two slide rods 3, whose outer wall is slidably connected to the protective shell 6, one end of which extends slidably into the second limiting block groove 15 and is fixedly connected to the limiting block 13. The slide rod 3 plays a guiding role in the movement of the protective baffle assembly, ensuring that the limiting block 13 can slide along the predetermined direction, while bearing the elastic force of the return spring 14 to maintain the mechanical balance of the structure. Protective baffle 4: The protective baffle 4 in the four protective baffle assemblies is respectively set on the four sides of the auxiliary tray body 1. Its lower outer wall is rotatably connected to the opposite surfaces of two corresponding protrusions on the auxiliary tray body 1, and can rotate around the connection point. The protective pad on one side of the outer wall of the protective baffle 4 can prevent the parts from directly and rigidly contacting the protective baffle 4 during the loading and placement of parts, and play a role in buffering and scratch protection. In addition, two first limiting block grooves 12 are opened on the lower outer wall of the protective baffle 4, which are used to cooperate with the limiting block 13 to realize the limiting and fixing of the protective baffle 4. Protective shell 6: Each protective baffle assembly has two protective shells 6, which are fixedly installed on the upper surface of the corresponding protrusion of the auxiliary tray body 1. They serve to protect the internal sliding rod 3, limiting block 13, return spring 14 and other structures. The second limiting block groove 15 and push block groove 9 opened on its outer wall provide sliding space for the limiting block 13 and push block 7 respectively. Through reasonable structural design, the smoothness and stability of the movement between the components are ensured. Push block 7: Located inside the push block groove 9 and can slide, one end of which slides into the second limit block groove 15 and is fixedly connected to the limit block 13. By manually pushing the push block 7, the operator can drive the limit block 13 to slide in the second limit block groove 15 and the first limit block groove 12, thereby controlling the limit state of the protective baffle 4. The operation is convenient and intuitive. Limiting block 8: It is engaged inside the push block groove 9, and its two ends are fixedly connected to the outer wall of one side of the push block 7 and the inner wall of the push block groove 9, respectively. It is used to limit the sliding range of the push block 7, prevent the push block 7 from disengaging from the push block groove 9 during the sliding process, and ensure the structural integrity and functional reliability of the protective baffle assembly. Push block groove 9: It is opened on the outer wall of one side of the protective shell 6 and communicates with the second limit block groove 15 inside. It provides a sliding track for push block 7 and also provides an installation position for limit block 8, so that the operator can easily control the movement of limit block 13 through push block 7. Corner protection sleeve mounting groove 10: Four mounting grooves on the upper surface of the auxiliary tray body 1 are used to install corner protection sleeve 2. The shape of the groove is adapted to the T-shaped block of corner protection sleeve 2 to ensure that corner protection sleeve 2 can be accurately positioned during installation. And by tightening the fixing bolts 11, corner protection sleeve 2 is firmly connected to the auxiliary tray body 1. Fixing bolt 11: By connecting with the groove in the corner protection sleeve mounting groove 10, the corner protection sleeve 2 is fixed to the auxiliary pallet body 1, ensuring that the corner protection sleeve 2 will not loosen or fall off during use, and providing continuous and effective protection for the pallet corners; First limiting block groove 12: It is opened on the lower outer wall of the protective baffle 4. The two first limiting block grooves 12 are respectively engaged with two limiting blocks 13. When the limiting block 13 slides into the first limiting block groove 12, it can restrict the rotation of the protective baffle 4 and keep the protective baffle 4 in a vertical state, which can block and protect the parts placed on the auxiliary tray body 1. When the limiting block 13 is disengaged from the first limiting block groove 12, the protective baffle 4 can rotate freely, which facilitates the loading and unloading of parts. Limiting block 13: It slides in the second limiting block groove 15 and the first limiting block groove 12. One end is fixedly connected to the slide rod 3 and the other end is fixedly connected to the push block 7. Through the drive of the slide rod 3 and the push block 7, it can engage or disengage with the first limiting block groove 12, thereby controlling the limiting state of the protective baffle 4. It is a key component for the protective baffle assembly to realize the limiting function. Return spring 14: It is sleeved on the outer wall of the slide rod 3, and its two ends are fixedly connected to the outer wall of the limit block 13 and the inside of the second limit block groove 15 respectively. In the natural state, the return spring 14 is in a compressed or stretched state, providing the limit block 13 with the elastic force to return. When the push block 7 pushes the limit block 13 away from the first limit block groove 12, the push block 7 is released, and the elastic force of the return spring 14 will cause the limit block 13 to automatically slide back into the first limit block groove 12, so as to realize the automatic limit of the protective baffle 4. The second limiting block groove 15 is formed on the outer wall of the protective shell 6 near the protective baffle 4, providing sliding space for the limiting block 13, and also providing guidance and constraint for the movement of the slide rod 3 and the push block 7, ensuring that the limiting block 13 will not deviate or get stuck during the sliding process, and ensuring the normal operation of the protective baffle assembly.

[0024] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A component loading auxiliary tray for a sensor assembly station, comprising an auxiliary tray body (1) and four corner protective sleeves (2), characterized in that: The auxiliary tray body (1) is provided with four protective baffle assemblies; The protective baffle assembly includes a protective baffle (4) and two protective shells (6). A protective pad is provided on one side of the outer wall of the protective baffle (4). A sliding rod (3) is slidably connected to the outer wall of each of the two protective shells (6). A second limiting block groove (15) is opened on the outer wall of each of the two protective shells (6) near the protective baffle (4). A limiting block (13) is slidably connected inside the two second limiting block grooves (15). Two first limiting block grooves (12) are opened on the lower outer wall of the protective baffle (4). Among them, the outer wall of one side of each of the two protective shells (6) is provided with a push block groove (9), the inside of each of the two push block grooves (9) is slidably connected with a push block (7), the outer wall of each of the two slide rods (3) is sleeved with a reset spring (14), the inside of each of the two push block grooves (9) is locked with a limit block (8), and the four protective baffle assemblies are set on the four sides of the auxiliary tray body (1).

2. The component loading auxiliary tray of the sensor assembly station according to claim 1, characterized in that: The two protective shells (6) are fixedly installed on the upper surface of the corresponding protrusions of the auxiliary tray body (1), and the lower outer wall of the protective baffle (4) is rotatably connected to the opposite surfaces of the two corresponding protrusions on the auxiliary tray body (1). Among them, the two limiting blocks (13) near the end of the first limiting block groove (12) both slide to the outside of the second limiting block groove (15) and are respectively slidably connected to the inside of the corresponding first limiting block groove (12).

3. The component loading auxiliary tray of the sensor assembly station according to claim 1, characterized in that: The ends of the two slide rods (3) near the limiting block (13) are slidably extended into the interior of the second limiting block groove (15) and are fixedly connected to the outer wall of the corresponding limiting block (13); The two ends of the two reset springs (14) are fixedly connected to the outer wall of the corresponding limit block (13) and the inside of the second limit block groove (15), respectively, and the inside of the two push block grooves (9) are connected to the inside of the corresponding second limit block groove (15).

4. The component loading auxiliary tray of the sensor assembly station according to claim 1, characterized in that: The two push blocks (7) are slidably extended into the interior of the second limiting block groove (15) at one end near the limiting block (13) and are respectively fixedly connected to the outer wall of the corresponding limiting block (13); Among them, the outer walls of the two limit blocks (8) are fixedly connected to the outer wall of one side of the corresponding push block (7) and the inner wall of the push block groove (9).

5. The component loading auxiliary tray of the sensor assembly station according to claim 1, characterized in that: The upper surface of the auxiliary tray body (1) is provided with four corner protective sleeve mounting grooves (10), and the outer walls of the four corner protective sleeves (2) are all threaded with fixing bolts (11). The lower outer walls of the four sides of the auxiliary tray body (1) are all provided with connecting grooves. Among them, the outer walls of the T-shaped blocks on the four corner protective sleeves (2) are slidably connected to the interior of the corresponding corner protective sleeve mounting grooves (10).

6. The component loading auxiliary tray of the sensor assembly station according to claim 1, characterized in that: The inner wall of one side of each of the four corner protective sleeves (2) is in contact with the outer wall of the four corners of the auxiliary tray body (1); Among them, the four corner protective sleeves (2) are installed on the four corners of the auxiliary tray body (1) by means of fixing bolts (11) and internal thread connection to the corner protective sleeve installation groove (10). The upper surface of the auxiliary tray body (1) is fixedly installed with protective pads (5).