A regulating device comprising a fines rate weighing unit

Abstract

The utility model discloses a kind of adjusting device of containing tail rate weighing unit, by setting first adjusting mechanism, so that the component to be adjusted can be inserted shell or extracted shell along horizontal direction;By setting at least two second adjusting mechanism, the distance between the component to be adjusted and bottom plate is adjusted respectively by second adjusting mechanism, so as to adjust the levelness of the component to be adjusted, compared with the mode of adjusting the whole instrument in prior art, it is more convenient, and the adjustment accuracy is higher.The utility model has the beneficial effects that by setting first adjusting mechanism, so that the component to be adjusted can be inserted shell or extracted shell along horizontal direction;By setting at least two second adjusting mechanism, the distance between the component to be adjusted and bottom plate is adjusted respectively by second adjusting mechanism, so as to adjust the levelness of the component to be adjusted, compared with the mode of adjusting the whole instrument in prior art, it is more convenient, and the adjustment accuracy is higher.

Description

Technical Field

[0001] This utility model relates to the field of cigarette measurement technology, and in particular to an adjustment device for a weighing unit with a content of cigarette residue. Background Technology

[0002] The dust content of cigarettes is one of the important physical indicators in the finished cigarette product testing. It directly affects the filling effect of tobacco shreds inside the cigarette, thus influencing the draw resistance, tobacco consumption, and the consumer's smoking experience. This directly impacts key technical indicators such as cigarette head size, cigarette quality, tar content, and sensory evaluation. Therefore, detecting and controlling the dust content during cigarette manufacturing is of great significance for improving the quality of finished cigarettes and meeting consumer demands.

[0003] Currently, cigarette dust content measuring instruments are commonly used for testing. These instruments typically include modules such as a sieving module, a lifting module, a weighing module, and an electrical module. When measuring the weight of tobacco shreds and dust, the instrument must be horizontal. Most manufacturers adjust the level of the weighing module in their dust content measuring instruments by adjusting the weight module itself or the entire instrument. Both methods suffer from inconvenience and cumbersome adjustment procedures.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0005] The technical problem to be solved by this utility model is: how to solve the problem of the inconvenience of adjusting the weighing module.

[0006] This utility model solves the above-mentioned technical problems through the following technical means:

[0007] This utility model claims protection for an adjustment device for a weighing unit with final rate, including a base plate, a horizontally arranged base plate inside a housing, and a component to be adjusted arranged on the base plate;

[0008] It also includes a first adjustment mechanism, which is provided between the housing and the base plate. The first adjustment mechanism is configured to adjust the base plate to be inserted into or removed from the housing in a horizontal direction.

[0009] It also includes a second adjustment mechanism, with at least two second adjustment mechanisms disposed between the base plate and the component to be adjusted, and the at least two second adjustment mechanisms being configured to adjust the component to be adjusted to move away from or closer to the base plate in a vertical direction.

[0010] Preferably, the first adjustment mechanism includes a slide rail assembly, a slider assembly, and a locking assembly. The slide rail assembly and / or slider assembly are arranged inside the housing, and together with another slider assembly and / or another slide rail assembly arranged on the base plate, they form a guide rail guiding fit along the opening direction of the housing.

[0011] A locking assembly is provided between the housing and the base plate, and the locking assembly is configured to restrict relative movement between the base plate and the housing.

[0012] Preferably, at least one set of support plates is symmetrically arranged on both sides inside the housing, and a slide rail body is provided on the surface of the support plates that are far apart from each other, wherein the support plates and the slide rail body constitute a slide rail assembly;

[0013] A set of connecting plates are symmetrically arranged on both sides of the base plate. The connecting plates are located outside the support plate. The surfaces of the connecting plates that are close to each other are provided with slider bodies. The slider bodies and the slide rail bodies form a guide rail cooperation along the opening direction of the housing. The connecting plates and the slider bodies constitute a slider assembly.

[0014] Preferably, the locking assembly includes a first blocking block, a second blocking block, and a first connecting unit. The first blocking block is disposed on the surface of the bottom plate near the opening of the housing. The first blocking block is perpendicular to the bottom plate. The second blocking block is disposed inside the housing. The second blocking block is configured to fit against the first blocking block when the bottom plate is inserted into the housing. The mating surfaces of the first blocking block and the second blocking block are connected to each other through the first connecting unit.

[0015] Preferably, the second adjustment mechanism includes a clamping block, a rotating wheel, and a second connecting unit. The clamping block is disposed on the surface of the connecting plate that is close to each other. The rotating wheel is slidably disposed in the clamping mouth of the clamping block along the vertical direction. The top of the rotating wheel passes through the bottom plate, and the rotating wheel is threadedly engaged with the bottom of the part to be adjusted. The second connecting unit is disposed at the clamping mouth of the clamping block and is configured to adjust the size of the clamping mouth of the clamping block.

[0016] Preferably, the clamping block has a U-shaped cross-section, and the U-shaped opening forms the clamping opening of the clamping block. The inner wall of the clamping block has a through hole along the vertical direction, and a rotating wheel is coaxially inserted into the through hole. A second connecting unit is provided at the clamping opening of the clamping block located outside the rotating wheel.

[0017] Preferably, a first screw hole is formed on the surface of the second block near the first block, and an anti-loosening bolt is provided at the corresponding position of the first block. The anti-loosening bolt and the screw hole together form the first connecting unit.

[0018] Preferably, the first blocking block has a T-shaped cross-section, and an anti-collision unit is provided between the second blocking block and the first blocking block. The anti-collision unit and the first connecting unit are staggered.

[0019] Preferably, the support plate has an L-shaped cross-section, and the horizontal plate of the support plate is installed at the bottom of the shell through a third connecting unit.

[0020] Preferably, the connecting plate has an inverted L-shaped cross-section, and the connecting plates are symmetrically arranged on both sides of the base plate to form an inverted U-shaped cross-section.

[0021] The advantages of this utility model are:

[0022] I. This utility model claims to protect an adjustment device for a weighing unit with a final rate. By setting a first adjustment mechanism, the component to be adjusted can be inserted into or removed from the housing in a horizontal direction. By setting at least two second adjustment mechanisms, the second adjustment mechanisms respectively adjust the distance between the component to be adjusted and the base plate, thereby adjusting the levelness of the component to be adjusted. Compared with the method of adjusting the entire instrument in the prior art, this is more convenient and has higher adjustment accuracy.

[0023] Second, the sliding guide engagement between the slide rail assembly and the slider assembly allows the component to be adjusted to be inserted into or partially withdrawn from the housing; in conjunction with the locking assembly, when the component to be adjusted slides into the housing to perform the weighing operation, the locking assembly locks the base plate and the housing, thus preventing the sliding engagement from affecting the weighing operation of the component to be adjusted within the weighing module.

[0024] Third, the support plate has an L-shaped cross-section, which not only provides ample installation space for the third connecting unit, but also matches the inverted L-shaped cross-section of the connecting plate. This ensures that the support plate and the connecting plate do not interfere with each other during sliding, while providing sufficient installation space for the slide rail body and the slider body.

[0025] Fourth, the first blocking block is preferably a T-shaped cross-section configuration, which provides sufficient installation space for the first connecting unit and the anti-collision unit; when the base plate is inserted into the housing, the first connecting unit connects the first blocking block and the second blocking block, so that the component to be adjusted remains relatively stable with the housing in the horizontal direction; when the base plate is inserted into the housing, the anti-collision unit reduces the problem of damage to the precision of the component to be adjusted due to mutual impact.

[0026] 5. The second adjustment mechanism, through the cooperation of the clamping block and the second connecting unit, allows the clamping block to switch between two states. State 1: When the clamping block jaws are open, the rotating wheel is rotated to adjust the height of one side of the component to be adjusted, thereby achieving leveling of the component to be adjusted. State 2: When the clamping block jaws are closed, the rotating wheel cannot be adjusted, avoiding the influence of the rotating wheel on the weighing operation of the component to be adjusted.

[0027] VI. The clamping block can be V-shaped or other notched shapes. In this utility model, a U-shaped cross-section configuration is preferred. Combined with the through hole in the vertical direction of the inner wall of the clamping block, it can not only guide and position the rotation of the wheel, but also make the clamping more stable due to the large contact area during the clamping process. In addition, the clamping block has sufficient reserved installation position for the second connecting unit to ensure the stability of the clamping block's closed state. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the adjustment device of the weighing unit with a final content of the present invention, and the connection structure between the part to be adjusted and the shell.

[0029] Figure 2 yes Figure 1 A side sectional view;

[0030] Figure 3 This is a schematic diagram of the first adjusting mechanism of this utility model;

[0031] Figure 4 This is a side sectional view of the adjustment device of the weighing unit with a content of powder in this utility model.

[0032] Figure 5 yes Figure 4 A magnified view of a portion of the image;

[0033] Figure 6 This is a top view of the adjustment device of the weighing unit with a final content of the present invention;

[0034] Figure 7 yes Figure 6 A magnified view of a portion of the image.

[0035] a. Housing; b. Component to be adjusted;

[0036] 1. Base plate;

[0037] 2. First adjusting mechanism; 20. Slide rail assembly; 200. Support plate; 201. Slide rail body; 21. Slider assembly; 210. Connecting plate; 211. Slider body; 22. Locking assembly; 220. First blocking block; 221. Second blocking block; 222. First connecting unit; 2220. First screw hole; 2221. Anti-loosening bolt; 23. Anti-collision unit;

[0038] 3. Second adjustment mechanism; 30. Clamping block; 300. Through hole; 31. Rotary wheel; 32. Second connecting unit; 320. Adjusting bolt; 321. Adjusting screw hole. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0040] See Figure 1 and Figure 2This utility model claims protection for an adjustment device for a weighing unit with a final rate, including a base plate 1, a first adjustment mechanism 2 and a second adjustment mechanism 3, wherein the base plate 1 is horizontally arranged inside the housing a, and the component to be adjusted b is arranged on the base plate 1;

[0041] A first adjustment mechanism 2 is provided between the shell a and the base plate 1. The first adjustment mechanism 2 is configured to adjust the base plate 1 to be inserted into the shell a horizontally or to be partially removed from the shell a.

[0042] See Figures 1 to 4 Furthermore, the first adjustment mechanism 2 includes a slide rail assembly 20, a slider assembly 21, and a locking assembly 22. The slide rail assembly 20 and / or the slider assembly 21 are arranged inside the housing a, and together with another slider assembly and / or another slide rail assembly arranged on the base plate 1, they form a guide rail guiding engagement along the opening direction of the housing a.

[0043] Furthermore, at least one set of support plates 200 are symmetrically arranged on both sides of the shell a. The support plates 200 have an L-shaped cross-section. The horizontal plates of the support plates 200 are installed at the bottom of the shell a through a third connecting unit. The surfaces of the support plates 200 that are far apart from each other are provided with slide rail bodies 201. The support plates 200 and the slide rail bodies 201 constitute a slide rail assembly 20. A set of connecting plates 210 are symmetrically arranged on both sides of the bottom plate 1. The connecting plates 210 are located outside the support plates 200. The connecting plates 210 have an inverted L-shaped cross-section. The connecting plates 210 symmetrically arranged on both sides of the bottom plate 1 form an inverted U-shaped cross-section. The surfaces of the connecting plates 210 that are close to each other are provided with slider bodies 211. The slider bodies 211 and the slide rail bodies 201 constitute a guide rail guide engagement along the opening direction of the shell a. The connecting plates 210 and the slider bodies 211 constitute a slider assembly 21.

[0044] It is worth mentioning that the support plate 200 has an L-shaped cross-section, which not only provides ample installation space for the third connecting unit, but also matches the inverted L-shaped cross-section of the connecting plate 210. This ensures that the support plate 200 and the connecting plate 210 do not interfere with each other when sliding, while providing sufficient installation space for the slide rail body 201 and the slider body 211.

[0045] A locking assembly 22 is provided between the housing a and the base plate 1. The locking assembly 22 is configured to restrict relative movement between the base plate 1 and the housing a.

[0046] Furthermore, the locking assembly 22 includes a first blocking block 220, a second blocking block 221, and a first connecting unit 222. The first blocking block 220 is disposed on the surface of the bottom plate 1 near the opening of the housing a. The first blocking block 220 has a T-shaped cross-section and is perpendicular to the bottom plate 1. The second blocking block 221 is disposed inside the housing a. An anti-collision unit 23 is disposed between the second blocking block 221 and the first blocking block 220. The anti-collision unit 23 and the first connecting unit 222 are staggered. The second blocking block 221 is configured to fit against the first blocking block 220 when the bottom plate 1 is inserted into the housing a. The mating surfaces of the first blocking block 220 and the second blocking block 221 are connected to each other through the first connecting unit 222.

[0047] It is worth mentioning that the first blocking block 220 is preferably a T-shaped cross-section configuration, which provides sufficient installation space for the first connecting unit 222 and the anti-collision unit 23; when the base plate 1 is inserted into the housing a, the first connecting unit 222 connects the first blocking block 220 with the second blocking block 221, so that the component to be adjusted b remains relatively stable with the housing a in the horizontal direction; when the base plate 1 is inserted into the housing a, the anti-collision unit 23 reduces the problem of precision damage to the component to be adjusted b caused by mutual collision.

[0048] See Figures 1 to 5 Furthermore, a first screw hole 2220 is opened on the surface of the second block 221 near the first block 220, and an anti-loosening bolt 2221 is provided at the corresponding position of the first block 220. The anti-loosening bolt 2221 and the screw hole together form the first connecting unit 222. The diameter of the two ends of the anti-loosening bolt 2221 is larger than the diameter of the middle end, and the middle end of the anti-loosening bolt 2221 is adapted to the first block 220 to prevent the anti-loosening bolt 2221 from falling off.

[0049] It is worth mentioning that the sliding guide cooperation between the slide rail assembly 20 and the slider assembly 21 can realize the insertion or partial extraction of the component b to be adjusted into the housing a; in conjunction with the locking assembly 22, when the component b to be adjusted slides into the housing a to perform the weighing operation, the locking assembly 22 locks the base plate 1 and the housing a, so that the weighing module b is stably arranged in the housing a, avoiding the impact of the sliding cooperation on the weighing operation of the component b to be adjusted.

[0050] See Figures 1 to 7 In this configuration, at least two second adjustment mechanisms 3 are disposed between the base plate 1 and the component b to be adjusted, and the at least two second adjustment mechanisms 3 are configured to adjust the component b to move away from or closer to the base plate 1 in the vertical direction.

[0051] Furthermore, the second adjustment mechanism 3 includes a clamping block 30, a rotating wheel 31, and a second connecting unit 32. The clamping block 30 is provided on the surface of the connecting plate 210 that is close to each other. The rotating wheel 31 is slidably provided in the clamping mouth of the clamping block 30 along the vertical direction. The top of the rotating wheel 31 passes through the bottom plate 1, and the rotating wheel 31 is threadedly engaged with the bottom of the part b to be adjusted. The second connecting unit 32 is provided at the clamping mouth of the clamping block 30 and is configured to adjust the clamping mouth size of the clamping block 30.

[0052] Furthermore, the clamping block 30 has a U-shaped cross-section, and the U-shaped opening forms the clamping opening of the clamping block 30. The inner wall of the clamping block 30 has a through hole 300 along the vertical direction. The rotating wheel 31 is coaxially inserted into the through hole 300. A second connecting unit 32 is provided at the clamping opening of the clamping block 30 located outside the rotating wheel 31. The clamping block 30 can be V-shaped or other shapes with notches. In this utility model, the preferred cross-section is U-shaped. Combined with the through hole 300 along the vertical direction of the inner wall of the clamping block 30, it can not only guide and position the rotation of the rotating wheel 31, but also make the clamping more stable due to the large contact area during the clamping process. Moreover, the clamping block 30 has sufficient reserved installation position for the second connecting unit 32 to ensure the stability of the clamping opening of the clamping block 30 in the closed state.

[0053] The second adjustment mechanism 3, through the cooperation of the clamping block 30 and the second connecting unit 32, allows the clamping block 30 to switch between two states. In state one, when the clamping jaws of the clamping block 30 are open, the rotating wheel 31 is rotated to adjust the height of one side of the component b to be adjusted, thereby achieving leveling of the component b. In state two, when the clamping jaws of the clamping block 30 are closed, the rotating wheel 31 cannot be adjusted, thus avoiding the influence of the rotation of the rotating wheel 31 on the weighing operation of the component b to be adjusted.

[0054] This utility model claims an adjustment device for a weighing unit with a final rate. By setting a first adjustment mechanism 2, the component to be adjusted b can be inserted into or removed from the housing a in the horizontal direction. By setting at least two second adjustment mechanisms 3, the second adjustment mechanisms 3 respectively adjust the distance between the component to be adjusted b and the base plate 1, thereby adjusting the levelness of the component to be adjusted b. Compared with the method of adjusting the entire instrument in the prior art, this is more convenient and has higher adjustment accuracy.

[0055] Based on this, a specific application scenario for adjusting the weighing unit containing tobacco dust is provided, which adjusts the weighing module of tobacco shreds and tobacco dust, wherein the component to be adjusted, b, is the weighing module.

[0056] The third connecting unit is preferably a connecting bolt, and the support plate 200 is installed in the connecting screw hole at the bottom of the housing a through the connecting bolt.

[0057] The anti-collision unit 23 is preferably a hydraulic buffer. One end of the hydraulic buffer is installed on the second block 221. The hydraulic buffer is arranged perpendicularly to the second block 221, and the other end of the hydraulic buffer is directly opposite the first block 220. The hydraulic buffer buffers the first block 220 and the second block 221 through hydraulic damping. This is the prior art and will not be described in detail.

[0058] The second connecting unit 32 preferably includes an adjusting bolt 320 and an adjusting screw hole 321. The adjusting screw hole 321 is penetrated on the side of the clamping block 30 away from the through hole 300. The adjusting bolt 320 is engaged in the adjusting screw hole 321 to realize the opening and closing of the clamping block 30.

[0059] The adjustment process of the regulating device includes the following stages:

[0060] Phase 1: Adjusting the first adjustment mechanism 2, specifically including pulling the base plate 1 out of the housing a and inserting the base plate 1 into the housing a.

[0061] Taking the removal of the base plate 1 from the housing a as an example, firstly, unscrew the anti-detachment bolt 2221 to make the first blocking block 220 and the second blocking block 221 independent of each other; secondly, pull the base plate 1 along the opening direction of the housing a so that the slide rail assembly 20 slides and engages with another slider assembly, and the weighing module is removed from a.

[0062] The process of pulling the base plate 1 out of the housing a and inserting the base plate 1 into the housing a is the reverse operation, and will not be described again.

[0063] Phase Two: Adjusting the Second Adjustment Mechanism 3. There are multiple Second Adjustment Mechanisms 3. The main purpose is to achieve leveling of the weighing module by adjusting the different support heights of each Second Adjustment Mechanism 3 on the base plate 1. Taking one of the Second Adjustment Mechanisms 3 as an example, firstly, loosen the adjusting bolt 320 to open the clamping jaws of the clamping block 30, and adjust the rotating wheel 31 to bring the height of the component b to be adjusted to the appropriate position; secondly, tighten the adjusting bolt 320 to lock the position of the rotating wheel 31.

[0064] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications 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 this utility model.

Claims

1. An adjustment device for a weighing unit containing a certain percentage of waste products, characterized in that, Includes a base plate (1), the base plate (1) is horizontally arranged inside the housing (a), and the component to be adjusted (b) is arranged on the base plate (1); It also includes a first adjustment mechanism (2), which is provided between the housing (a) and the base plate (1). The first adjustment mechanism (2) is configured to adjust the base plate (1) to be inserted into or removed from the housing (a) in the horizontal direction. It also includes a second adjustment mechanism (3), with at least two second adjustment mechanisms (3) placed between the base plate (1) and the component to be adjusted (b), and the at least two second adjustment mechanisms (3) are configured to adjust the component to be adjusted (b) to move away from or closer to the base plate (1) in the vertical direction.

2. The adjusting device for a weighing unit with a content of final product according to claim 1, characterized in that, The first adjustment mechanism (2) includes a slide rail assembly (20), a slider assembly (21) and a locking assembly (22). The slide rail assembly (20) and / or the slider assembly (21) are arranged inside the housing (a), and together with another slider assembly and / or another slide rail assembly arranged on the base plate (1), they form a guide rail guiding fit along the opening direction of the housing (a). A locking assembly (22) is provided between the housing (a) and the base plate (1), and the locking assembly (22) is configured to restrict relative movement between the base plate (1) and the housing (a).

3. The adjusting device for a weighing unit with a content of final product according to claim 2, characterized in that, At least one set of support plates (200) are symmetrically arranged on both sides inside the housing (a), and slide rail bodies (201) are provided on the surfaces of the support plates (200) that are far apart from each other. The support plates (200) and the slide rail bodies (201) constitute a slide rail assembly (20). A set of connecting plates (210) are symmetrically arranged on both sides of the base plate (1). The connecting plates (210) are located outside the support plate (200). The surfaces of the connecting plates (210) that are close to each other are provided with slider bodies (211). The slider bodies (211) and the slide rail bodies (201) form a guide rail guide engagement along the opening direction of the housing (a). The connecting plates (210) and the slider bodies (211) constitute a slider assembly (21).

4. The adjusting device for a weighing unit with a content of final product according to claim 2, characterized in that, The locking assembly (22) includes a first blocking block (220), a second blocking block (221), and a first connecting unit (222). The first blocking block (220) is disposed on the surface of the bottom plate (1) near the opening of the housing (a). The first blocking block (220) is perpendicular to the bottom plate (1). The second blocking block (221) is disposed inside the housing (a). The second blocking block (221) is configured to fit against the first blocking block (220) when the bottom plate (1) is inserted into the housing (a). The mating surfaces of the first blocking block (220) and the second blocking block (221) are connected to each other through the first connecting unit (222).

5. The adjusting device for a weighing unit with a content of final product according to claim 1, characterized in that, The second adjustment mechanism (3) includes a clamping block (30), a rotating wheel (31), and a second connecting unit (32). The clamping block (30) is provided on the surface of the connecting plate (210) which are close to each other. The rotating wheel (31) is rotatably provided in the clamping mouth of the clamping block (30) along the vertical direction. The top of the rotating wheel (31) passes through the bottom plate (1), and the rotating wheel (31) is threadedly engaged with the bottom of the part (b) to be adjusted. The second connecting unit (32) is provided at the clamping mouth of the clamping block (30), and the second connecting unit (32) is configured to adjust the clamping mouth size of the clamping block (30).

6. The adjusting device for a weighing unit with a content of final product according to claim 5, characterized in that, The clamping block (30) has a U-shaped cross-section and the U-shaped opening forms the clamping opening of the clamping block (30). The inner wall of the clamping block (30) is penetrated by a through hole (300) along the vertical direction. A rotating wheel (31) is coaxially inserted into the through hole (300). A second connecting unit (32) is provided at the clamping opening of the clamping block (30) located outside the rotating wheel (31).

7. The adjusting device for a weighing unit with a content of final product according to claim 4, characterized in that, A first screw hole (2220) is opened on the surface of the second block (221) near the first block (220), and an anti-loosening bolt (2221) is provided at the corresponding position of the first block (220). The anti-loosening bolt (2221) and the screw hole together constitute the first connecting unit (222).

8. The adjusting device for a weighing unit with a content of final product according to claim 7, characterized in that, The first blocking block (220) has a T-shaped cross-section. A collision protection unit (23) is provided between the second blocking block (221) and the first blocking block (220). The positions of the collision protection unit (23) and the first connecting unit (222) are staggered.

9. The adjusting device for a weighing unit with a content of final product according to claim 3, characterized in that, The support plate (200) has an L-shaped cross-section and the horizontal plate of the support plate (200) is installed at the bottom of the shell (a) through the third connecting unit.

10. The adjusting device for a weighing unit with a content of final product according to claim 3, characterized in that, The connecting plate (210) has an inverted L-shaped cross-section, and the connecting plates (210) are symmetrically arranged on both sides of the bottom plate (1) to form an inverted U-shaped cross-section.

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