A metrology detection kit

Abstract

The application relates to the technical field of toolboxes, and more particularly discloses a metering detection toolbox which comprises a box body assembly, a box door assembly, a box door limiting assembly, a device supporting assembly and a device fixing assembly. The box body assembly comprises a box body, sliding grooves are arranged at the top of the inner walls on the two sides of the box body, elastic blocks are movably sleeved on the top of the inner walls on the two sides of the back of the box body, the back of each elastic block is fixedly connected with a first limiting plate, and the back of the first limiting plate is fixedly connected with a first spring. The measuring device to be placed into the toolbox is placed on the fixing table, the second limiting plate, the telescopic block and the supporting plate are lowered under the action of the mass of the device itself, and then the second spring is compressed, which is beneficial to the placing and taking out of the device by the user. The fixing mode of the application does not use a sponge body, so the volume of the sponge body will not shrink, and the device cannot be fixed well.

Description

A metrology and testing toolbox Technical Field

[0001] This invention relates to the field of toolbox technology, and more specifically to a metrology and testing toolbox. Background Technology

[0002] Existing metrological testing equipment at construction sites includes measuring tapes for measuring length, plumb bobs for measuring depth, dust detectors for detecting dust content, and decibel meters for detecting noise. Some of the existing metrological testing equipment, such as measuring tapes and plumb bobs, can be transported or stored directly in the outside environment. However, dust detectors and decibel meters, for example, need to be stored in toolboxes when being transported or stored.

[0003] There are two main ways to fix dust detectors and decibel meters in existing testing toolboxes. One is to fill the outside of the equipment with sponge, which can wrap the equipment and fill the toolbox completely. The advantage of sponge filling is that it has good cushioning ability and can reduce the impact on the equipment when the toolbox is impacted.

[0004] Existing metrology and testing toolkits have the following shortcomings in practical use:

[0005] Firstly, existing testing toolboxes use sponges that conform to the shape of the equipment to secure it when storing testing equipment. However, due to the properties of the sponge itself, its deformation coefficient changes after a period of use, making it unable to securely fix the equipment. Furthermore, the sponge adhering to the outer surface of the equipment makes it inconvenient for users to place and remove the equipment, which is not conducive to user operation.

[0006] Secondly, existing metrology and testing toolboxes are mostly sealed by a sealing plate and locking device on the top of the box after the equipment is placed inside. However, this sealing method will leave gaps at the seal, allowing external dust to enter the testing box through air displacement, which is not conducive to the long-term preservation of the equipment. Summary of the Invention

[0007] In order to overcome the above-mentioned defects of the prior art, the present invention provides a metrology and testing toolbox to solve the problems existing in the background art.

[0008] This invention provides the following technical solution: A metrology and testing toolbox is provided, comprising a box body assembly, a door assembly, a door limiting assembly, an equipment support assembly, and an equipment fixing assembly. The box body assembly includes a main body. Sliding grooves are formed on the top of the inner walls on both sides of the main body. Spring blocks are movably fitted onto the top of the inner wall on the back of the main body on both sides. A first limiting plate is fixedly connected to the back of each spring block. A first spring is fixedly connected to the back of the first limiting plate. First telescopic grooves are formed on the top of the inner wall on the back of the main body on both sides corresponding to the positions of the spring blocks. The back of the first spring is fixedly connected to the back of the first telescopic groove of the main body. The size of the first limiting plate is adapted to the internal size of the first telescopic groove of the main body, and the size of the spring block is matched to the opening size of the first telescopic groove of the main body.

[0009] Furthermore, a door assembly is slidably connected to the inner side of the slide groove. The door assembly includes a door body, a sealing plate is fixedly connected to the back of the bottom of the door body, sliders are fixedly connected to the front of both sides of the door body, a square groove is opened on the front of the top of the door body, a first limiting tooth is fixedly connected to the bottom of the square groove, a square groove is opened on the top of the back of the door body, and the depth of the square groove matches the thickness of the sealing plate. The size of the slider matches the slide groove, and the cross-section of the first limiting tooth is an obtuse triangle.

[0010] Furthermore, the door limiting assembly includes a rotating plate, a second limiting tooth fixedly connected to the back of the bottom of the rotating plate, a rotating shaft fixedly sleeved on the side of the rotating plate, ball bearings fixedly sleeved on both sides of the outer surface of the rotating shaft, a torque spring fixedly sleeved on the outer side of the rotating plate, a limiting block provided at the bottom of the rotating plate, U-shaped grooves provided on both sides of the top front of the main body of the box, the outer sides of the ball bearings fixedly sleeved to the sides of the U-shaped grooves, the bottom of the limiting block being connected to the bottom of the U-shaped groove, the front of the limiting block being located at the center of the bottom of the U-shaped groove, a square groove provided on the front top of the limiting block, and the shape of the second limiting tooth being the same as that of the first limiting tooth but in the opposite direction.

[0011] Furthermore, the equipment support assembly includes a gravity sensing component. The bottom of the gravity sensing component is fixedly connected to the bottom of the inner side of the main body of the housing. The gravity sensing component includes a cover, the bottom of which is fixedly connected to a base plate. A second spring is fixedly connected to the top of the base plate. A second limiting plate is fixedly connected to the top of the second spring. A telescopic block is fixedly connected to the top of the second limiting plate. A support plate is fixedly connected to the top of the telescopic block. A fixing plate is fixedly connected to the top of the gravity sensing component. A fixing platform is fixedly connected to the center of the top of the fixing plate. Triangular plates are fixedly connected to the four corners of the top of the fixing plate. The cross-sectional view of the main body of the housing is H-shaped. The dimensions of the bottom space of the main body of the box are matched with the dimensions of the second limiting plate. The dimensions and depth of the top space of the cover are matched with the support plate. The dimensions of the connecting hole in the middle of the cover are matched with the dimensions of the telescopic block. The area of ​​the bottom of the cover is the same as the area of ​​the top of the base plate. The fixing plate, the fixing platform, and the triangular plate are all made of hollow polyethylene. All components in the gravity sensing component, except for the second spring, are made of polyethylene. The sum of the distance between the bottom of the second limiting plate and the top of the support plate and the height of the second spring after compression is the same as the height of the cover. The equipment support component is located in the middle of the bottom inner side of the main body of the box. The top of the fixing platform is provided with a rubber layer.

[0012] Furthermore, the equipment fixing assembly includes a fixing block, a third spring fixedly connected to the inner side of the fixing block, a third limiting plate fixedly connected to one side of the third spring, a telescopic column fixedly connected to one side of the third limiting plate, a roller movably connected to the back of the telescopic column, and an equipment clamping plate fixedly connected to one side of the telescopic column. Four square slots are formed on one side of the fixing block, and a circular slot for fixing the third spring is formed on the other side of the square slots. The internal dimensions of the square slots of the fixing block match the third limiting plate, and the opening dimensions of the square slots match the cross-sectional dimensions of the telescopic column. The telescopic column and the roller are movably connected via bearings. The triangular plate is located between two telescopic columns, and a rubber layer is provided on the contact surface between the equipment clamping plate and the equipment. Technical effects and advantages of the present invention:

[0013] 1. This invention places the measuring equipment to be placed in the toolbox onto a fixed platform. Under the weight of the equipment itself, the second limiting plate, telescopic block, and support plate descend, thereby compressing the second spring and causing the triangular plate to descend. The inclined surface of the triangular plate pushes the roller closer to the equipment, which in turn pushes the equipment clamping plate closer to the equipment to fix it. When the equipment is removed, the pressure generated by the weight of the equipment disappears, and the pushing of the second spring and the contraction of the third spring cause the equipment support component and the equipment fixing component to return to their original positions. This is convenient for users to place or remove the equipment. Furthermore, the fixing method of this invention does not use a sponge, which would cause the sponge to shrink and fail to fix the equipment properly. Moreover, the equipment support component and the equipment fixing component of this invention can provide the same cushioning capacity as a sponge.

[0014] 2. When the equipment enclosure is closed, the present invention pushes the enclosure door body towards the front of the enclosure body. The first limiting tooth impacts the second limiting tooth. Since both the second and first limiting teeth are inclined surfaces, the rotating plate can be pushed to rotate counterclockwise. Then, when the first limiting tooth passes the second limiting tooth, it returns to its original position under the action of the torque spring, locking the enclosure door body. When the enclosure is opened, it is only necessary to press the front rotating plate at the top of the rotating plate to rotate counterclockwise. Then, the spring block is pushed out by the rebound of the first spring, and then the enclosure door body is pushed out. Then, the enclosure door body can be pulled open. This helps to avoid gaps between the sealing plate and the enclosure body. This application uses a sliding plate seal to reduce the entry of dust and facilitate the long-term storage of the equipment. Attached Figure Description

[0015] Figure 1 is a schematic diagram of the overall structure of the present invention.

[0016] Figure 2 is a schematic cross-sectional view of the overall structure of the present invention.

[0017] Figure 3 is a schematic diagram of the box assembly structure of the present invention.

[0018] Figure 4 is a schematic cross-sectional view of the housing assembly of the present invention.

[0019] Figure 5 is a schematic diagram of the door assembly structure of the present invention.

[0020] Figure 6 is a schematic diagram of the door limiting component structure of the present invention.

[0021] Figure 7 is a schematic diagram of the equipment support component structure of the present invention.

[0022] Figure 8 is a schematic diagram of the gravity sensing component structure of the present invention.

[0023] Figure 9 is a schematic diagram of the device fixing component structure of the present invention.

[0024] The attached figures are labeled as follows: 1. Box assembly; 101. Box body; 102. Slide groove; 103. Spring block; 104. First limiting plate; 105. First spring; 2. Box door assembly; 201. Box door body; 202. Sealing plate; 203. Slider; 204. First limiting tooth; 3. Box door limiting assembly; 301. Rotating plate; 302. Second limiting tooth; 303. Rotating shaft; 304. Ball bearing; 305. Torque spring; 306. Limiting block; 4. 401. Equipment support components; 401. Gravity sensing components; 4011. Cover; 4012. Base plate; 4013. Second spring; 4014. Second limiting plate; 4015. Telescopic block; 4016. Support plate; 402. Fixing plate; 403. Fixing platform; 404. Triangular plate; 5. Equipment fixing components; 501. Fixing block; 502. Third spring; 503. Third limiting plate; 504. Telescopic column; 505. Equipment clamping plate; 506. Roller. Detailed Implementation

[0025] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. The metrology and testing toolbox involved in the present invention is not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Referring to Figures 1-4, the present invention provides a metrology and testing toolbox, including a box assembly 1, a door assembly 2, a door limiting assembly 3, an equipment support assembly 4, and an equipment fixing assembly 5. The box assembly 1 includes a box body 101. Sliding grooves 102 are provided on the top of the inner walls on both sides of the box body 101. Spring blocks 103 are movably sleeved on both sides of the top of the inner wall on the back of the box body 101. A first limiting plate 104 is fixedly connected to the back of the spring block 103. A first spring 105 is fixedly connected to the back of the first limiting plate 104. A first telescopic groove is provided on both sides of the top of the inner wall on the back of the box body 101 corresponding to the position of the spring block 103. The back of the first spring 105 is fixedly connected to the back of the first telescopic groove of the box body 101. The size of the first limiting plate 104 is adapted to the internal size of the first telescopic groove of the box body 101. The size of the spring block 103 is matched with the opening size of the first telescopic groove of the box body 101.

[0027] In this embodiment, specifically, regardless of the position of the first limiting plate 104 in the first telescopic groove, the first spring 105 is always in a compressed state and has the deformation force to push the first limiting plate 104 forward. The fit between the first limiting plate 104 and the internal dimensions of the first telescopic groove, as well as the fit between the spring block 103 and the first telescopic groove, is a tolerance fit. That is, the fit between the first telescopic groove and the spring block 103 and the first limiting plate 104 can enable the spring block 103 and the first limiting plate 104 to extend and retract normally. In other words, this embodiment does not limit its specific tolerance.

[0028] Referring to Figure 5, a door assembly 2 is slidably connected to the inner side of the slide groove 102. The door assembly 2 includes a door body 201. A sealing plate 202 is fixedly connected to the back of the bottom of the door body 201. Slider 203s are fixedly connected to the front of both sides of the door body 201. A square groove is opened on the front of the top of the door body 201. A first limiting tooth 204 is fixedly connected to the bottom of the square groove of the door body 201. A square groove is opened on the top of the back of the door body 101, and the depth of the square groove matches the thickness of the sealing plate 202. The size of the slider 203 matches the slide groove 102. The cross-sectional view of the first limiting tooth 204 is an obtuse triangle.

[0029] In this embodiment, specifically, the cooperation relationship between the slider 203 and the slide groove 102 is such that the door body 201 can slide on the inner side of the slide groove 102 through the slider 203 without causing the door assembly 2 to shake when it is engaged with the box body assembly 1. The dimensional deviation between the slider 203 and the slide groove 102 is not specifically limited in this embodiment, as long as the above-mentioned limiting conditions are met.

[0030] Referring to Figure 6, the door limiting assembly 3 includes a rotating plate 301. A second limiting tooth 302 is fixedly connected to the back of the bottom of the rotating plate 301. A rotating shaft 303 is fixedly sleeved on the side of the rotating plate 301. Ball bearings 304 are fixedly sleeved on both sides of the outer surface of the rotating shaft 303. A torque spring 305 is fixedly sleeved on the outer side of the rotating plate 301. A limiting block 306 is provided at the bottom of the rotating plate 301. U-shaped grooves are provided on both sides of the top front of the main body 101 of the box. The outer side of the ball bearings 304 is fixedly sleeved on both sides of the U-shaped groove. The bottom of the limiting block 306 is connected to the bottom of the U-shaped groove. The front of the limiting block 306 is located at the center of the bottom of the U-shaped groove. A square groove is provided on the front top of the limiting block 306. The shape of the second limiting tooth 302 is the same as that of the first limiting tooth 204 but in the opposite direction.

[0031] In this embodiment, specifically, one end of the torque spring 305 is fixedly sleeved with the rotating shaft 303 and the other end is fixedly connected to the main body 101 of the box. The limiting block 306 is set to limit the position of the rotating plate 301 in the forward and reverse rotation, so as to ensure the service life of the box door limiting component 3.

[0032] Referring to Figures 7-8, the equipment support assembly 4 includes a gravity sensing assembly 401. The bottom of the gravity sensing assembly 401 is fixedly connected to the bottom of the inner side of the main body 101. The gravity sensing assembly 401 includes a cover 4011. A base plate 4012 is fixedly connected to the bottom of the cover 4011. A second spring 4013 is fixedly connected to the top of the base plate 4012. A second limiting plate 4014 is fixedly connected to the top of the second spring 4013. A telescopic block 4015 is fixedly connected to the top of the second limiting plate 4014. A support plate 4016 is fixedly connected to the top of the telescopic block 4015. A fixing plate 402 is fixedly connected to the top of the gravity sensing assembly 401. A fixing platform 403 is fixedly connected to the middle of the top of the fixing plate 402. Triangular plates 404 are fixedly connected to the four corners of the top of the fixing plate 402. The cross-sectional view of the main body 101 is H-shaped. The dimensions of the bottom space of the main body 101 are matched with the dimensions of the second limiting plate 4014. The dimensions and depth of the top space of the cover 4011 are matched with the support plate 4016. The dimensions of the connecting hole in the middle of the cover 4011 are matched with the dimensions of the telescopic block 4015. The area of ​​the bottom of the cover 4011 is the same as the area of ​​the top of the base plate 4012. The fixing plate 402, the fixing platform 403, and the triangular plate 404 are all made of hollow polyethylene. All components in the gravity sensing component 401, except for the second spring 4013, are made of polyethylene. The sum of the distance between the bottom of the second limiting plate 4014 and the top of the support plate 4016 and the height of the second spring 4013 after compression is the same as the height of the cover 4011. The equipment support component 4 is located in the middle of the bottom of the inner side of the main body 101. The top of the fixing platform 403 is provided with a rubber layer.

[0033] In this embodiment, specifically, the fit between the second limiting plate 4014 and the cover 4011, the support plate 4016 and the cover 4011, and the telescopic block 4015 and the cover 4011 is a tolerance fit. The deformation coefficient of the second spring 4013 can be adjusted according to the weight of the equipment placed in the box. That is, this embodiment does not specifically limit the deformation coefficient of the second spring 4013.

[0034] Referring to Figure 9, the equipment fixing assembly 5 includes a fixing block 501. A third spring 502 is fixedly connected to the inner side of the fixing block 501. A third limiting plate 503 is fixedly connected to one side of the third spring 502. A telescopic column 504 is fixedly connected to one side of the third limiting plate 503. A roller 506 is movably connected to the back of the telescopic column 504. An equipment clamping plate 505 is fixedly connected to one side of the telescopic column 504. Four square slots are provided on one side of the fixing block 501. A circular slot for fixing the third spring 502 is provided on the other side of the square slots of the fixing block 501. The internal dimensions of the square slots of the fixing block 501 are matched with the third limiting plate 503. The opening dimensions of the square slots of the fixing block 501 are matched with the cross-sectional dimensions of the telescopic column 504. The telescopic column 504 and the roller 506 are movably connected by bearings. A triangular plate 404 is located between two telescopic columns 504. A rubber layer is provided on the contact surface between the equipment clamping plate 505 and the equipment.

[0035] In this embodiment, specifically, the deformation coefficient of the third spring 502 can be adjusted according to the amount of equipment placed inside the box. That is, this embodiment does not specifically limit the deformation coefficient of the third spring 502. The fit between the fixed block 501 and the telescopic column 504 and the fit between the telescopic column 504 and the fixed block 501 are tolerance fits.

[0036] The working principle of this invention is as follows: The measuring equipment to be placed in the toolbox is placed on the fixed platform 403. The weight of the equipment itself causes the second limiting plate 4014, the telescopic block 4015, and the support plate 4016 to descend, compressing the second spring 4013. This, in turn, causes the triangular plate 404 to descend. The inclined surface of the triangular plate 404 pushes the roller 506 closer to the equipment, which in turn pushes the equipment clamping plate 505 closer to the equipment to fix it in place. When the equipment is removed, the pressure generated by the equipment's weight disappears. The pushing action of the second spring 4013 and the contraction of the third spring 502 cause the equipment support assembly 4 and the equipment fixing assembly 5 to return to their original positions. When the box is closed, by pushing the box door body 201 toward the front of the box body 101, the first limiting tooth 204 strikes the second limiting tooth 302. Since both the second limiting tooth 302 and the first limiting tooth 204 are inclined surfaces, the rotating plate 301 can be pushed to rotate counterclockwise. Then, when the first limiting tooth 204 passes the second limiting tooth 302, it returns to its original position under the action of the torque spring 305, locking the box door body 201. When the box is opened, simply press the front rotating plate 301 at the top to rotate it counterclockwise. Then, the spring block 103 is pushed out by the rebound of the first spring 105, which in turn pushes out the box door body 201. Then, the box door body 201 can be opened by pulling it open.

[0037] When the toolbox is impacted by the outside, the box shakes, causing the fixed equipment inside to shake further. However, due to the gravity sensing component 401, the force of the shaking equipment is converted into the deformation force of the second spring 4013. The deformation force of the second spring 4013 is consumed by the interaction force between the triangular plate 404 and the roller 506, thereby achieving the purpose of reducing the impact force.

Claims

1. A metrology and testing toolbox, comprising a box assembly (1), characterized in that, Also includes: The equipment includes a door assembly (2), a door limiting assembly (3), an equipment support assembly (4), and an equipment fixing assembly (5). The door assembly (1) includes a door body (101). The top of the inner walls on both sides of the door body (101) is provided with a sliding groove (102). The top of the inner wall on the back of the door body (101) is movably fitted with spring blocks (103) on both sides. The back of the spring blocks (103) is fixedly connected to a first limiting plate (104). The back of the first limiting plate (104) is fixedly connected to a first spring (105). The equipment support assembly (4) includes a gravity sensing assembly. (401) The bottom of the gravity sensing component (401) is fixedly connected to the bottom of the inner side of the main body (101). The gravity sensing component (401) includes a cover (4011). A base plate (4012) is fixedly connected to the bottom of the cover (4011). A second spring (4013) is fixedly connected to the top of the base plate (4012). A second limiting plate (4014) is fixedly connected to the top of the second spring (4013). A telescopic block (4015) is fixedly connected to the top of the second limiting plate (4014). The top of the telescopic block (4015) is fixedly... A support plate (4016) is connected to the top of the gravity sensing component (401), a fixing plate (402) is fixedly connected to the top, a fixing platform (403) is fixedly connected to the middle of the top of the fixing plate (402), and triangular plates (404) are fixedly connected to the four corners of the top of the fixing plate (402). The equipment fixing component (5) includes a fixing block (501), a third spring (502) is fixedly connected to the inner side of the fixing block (501), a third limiting plate (503) is fixedly connected to one side of the third spring (502), and a third limiting plate (503) is fixedly connected to one side of the third limiting plate (503). A telescopic column (504) is provided, with a roller (506) movably connected to its back side and a clamping plate (505) fixedly connected to one side of the telescopic column (504). The telescopic column (504) and the roller (506) are movably connected by a bearing. A triangular plate (404) is located between the two telescopic columns (504). A rubber layer is provided on the contact surface between the clamping plate (505) and the equipment. The roller (506) is pushed closer to the equipment by the inclined surface of the triangular plate (404), which in turn pushes the clamping plate (505) closer to the equipment to fix the equipment.

2. The metrology and testing toolbox according to claim 1, characterized in that: A door assembly (2) is slidably connected to the inner side of the slide groove (102). The door assembly (2) includes a door body (201). A sealing plate (202) is fixedly connected to the back of the bottom of the door body (201). Slider blocks (203) are fixedly connected to the front of both sides of the door body (201). A square groove is opened on the front of the top of the door body (201). A first limiting tooth (204) is fixedly connected to the bottom of the square groove of the door body (201). The door limiting assembly (3) includes a rotating plate (301), a second limiting tooth (302) is fixedly connected to the back of the bottom of the rotating plate (301), a rotating shaft (303) is fixedly sleeved on the side of the rotating plate (301), ball bearings (304) are fixedly sleeved on both sides of the outer surface of the rotating shaft (303), a torque spring (305) is fixedly sleeved on the outer side of the rotating plate (301), and a limiting block (306) is provided at the bottom of the rotating plate (301).

3. The metrology and testing toolbox according to claim 1, characterized in that: The top two sides of the inner wall of the back of the main body of the box (101) are provided with first telescopic grooves corresponding to the positions of the spring blocks (103). The back of the first spring (105) is fixedly connected to the back of the first telescopic groove of the main body of the box (101). The size of the first limiting plate (104) is adapted to the size of the inside of the first telescopic groove of the main body of the box (101). The size of the spring block (103) is matched with the opening size of the first telescopic groove of the main body of the box (101).

4. The metrology and testing toolbox according to claim 1, characterized in that: The cross-sectional view of the main body (101) is H-shaped. The dimensions of the bottom space of the main body (101) are matched with the dimensions of the second limiting plate (4014). The dimensions and depth of the top space of the cover (4011) are matched with the support plate (4016). The dimensions of the connecting hole in the middle of the cover (4011) are matched with the dimensions of the telescopic block (4015). The area of ​​the bottom of the cover (4011) is the same as the area of ​​the top of the base plate (4012). The fixing plate (402), the fixing platform (403), and the triangular plate (4014) are also matched. 4) All are hollow polyethylene materials. In the gravity sensing component (401), all components except the second spring (4013) are made of polyethylene. The sum of the distance between the bottom of the second limiting plate (4014) and the top of the support plate (4016) and the height of the second spring (4013) after compression is the same as the height of the cover (4011). The equipment support component (4) is located in the middle of the bottom of the inner side of the box body (101). The top of the fixed platform (403) is provided with a rubber layer.

5. A metrology and testing toolbox according to claim 1, characterized in that: The fixing block (501) has four square slots on one side and a circular slot for fixing the third spring (502) on the other side of the square slots. The internal dimensions of the square slots of the fixing block (501) are matched with the third limiting plate (503). The opening size of the square slots of the fixing block (501) is matched with the cross-sectional dimensions of the telescopic column (504).

6. A metrology and testing toolbox according to claim 2, characterized in that: The top of the back of the main body (101) of the box is provided with a square groove and the depth of the square groove matches the thickness of the sealing plate (202). The size of the slider (203) matches the groove (102). The cross-sectional view of the first limiting tooth (204) is an obtuse triangle.

7. A metrology and testing toolbox according to claim 2, characterized in that: The box body (101) has U-shaped grooves on both sides of the top front. The outer side of the ball bearing (304) is fixedly sleeved with the two sides of the U-shaped groove. The bottom of the limiting block (306) is connected to the bottom of the U-shaped groove. The front of the limiting block (306) is located at the center of the bottom of the U-shaped groove. The front of the top of the limiting block (306) has a square groove. The shape of the second limiting tooth (302) is the same as that of the first limiting tooth (204) but the opposite direction.

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