Enhanced bubble aluminum heat insulation film blanket production device

Abstract

The utility model relates to the technical field of bubble aluminum heat insulation film blanket production equipment, and discloses an enhanced bubble aluminum heat insulation film blanket production device which comprises an attaching box body, and an upper glue spreading roller and a lower glue spreading roller are rotationally connected between the opposite side walls in the attaching box body. And two rows of shaping rollers which are matched with the upper glue spreading roller and the lower glue spreading roller and are horizontally arranged are rotationally connected between the opposite side walls in the laminating box body. According to the utility model, the bubble aluminum heat-insulating film blanket base material passes through the space between the upper glue spreading roller and the lower glue spreading roller, the two surfaces of the bubble aluminum heat-insulating film blanket base material are glued through the upper glue spreading roller and the lower glue spreading roller, and the bubble aluminum heat-insulating film blanket base material and the two reinforcing layers are pulled to the space between the two rows of shaping rollers at the same time; the driving unit drives the multiple shaping rollers to shape the upper reinforcing layer, the lower reinforcing layer and the bubble aluminum heat insulation film blanket base material, the effect that the reinforcing layers are attached to the two faces of the bubble aluminum heat insulation film blanket base material at the same time is achieved, and then the production efficiency of the enhanced bubble aluminum heat insulation film blanket is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to bubble aluminum heat insulation film blanket production equipment technical field, concretely is a kind of enhanced bubble aluminum heat insulation film blanket production device. BACKGROUND

[0002] Bubble aluminum heat insulation film blanket is also called reflective bubble aluminum heat insulation film blanket or aluminum foil bubble heat insulation film, which is a reflective honeycomb structure heat insulation material.

[0003] In order to enhance the tensile strength of the bubble aluminum heat insulation film blanket, the prior art has made many improvements to the bubble aluminum heat insulation film blanket, such as the patent with the publication number CN213296708U, which discloses a bubble aluminum heat insulation blanket, which comprises a first heat insulation layer, n layers of bubble layers and a second heat insulation layer from top to bottom. The first heat insulation layer is fixedly connected with the n layers of bubble layers, and the n layers of bubble layers are adhesively connected with the second heat insulation layer. The low thermal conductivity of air in the bubble layer is utilized, and the physical principle is used to effectively isolate the radiant heat, so that the entire material has good heat insulation and heat preservation effect. The aluminum foil layer is provided with a scratch-resistant wear-resistant layer on one side, and a reinforcing layer is fixedly connected on the other side, to prevent the aluminum foil layer from being scratched or bent during construction, which affects the heat insulation and waterproof effect of the bubble aluminum foil layer. A PET film reinforcing layer is arranged between the bubble layer and the aluminum foil layer, which can enhance the tensile strength of the bubble aluminum heat insulation blanket and prevent the tensile woven layer from scratching the bubble layer. The bubble aluminum heat insulation blanket is formed by hot pressing and suction, without using polyurethane glue, which meets the green environmental protection concept and is not easy to crack, and can ensure good waterproof effect and heat insulation performance.

[0004] The above-mentioned patent has obvious beneficial effects, but still has the following disadvantages in actual operation:

[0005] In the above-mentioned comparative document, the symmetric reinforcing layer is arranged to enhance the tensile strength of the bubble aluminum heat insulation film blanket, so that the symmetric reinforcing layer and the scratch-resistant wear-resistant layer need to be laminated during production. In actual production, the lamination equipment only laminates the reinforcing layer on one side, and then laminates the reinforcing layer on the other side after laminating the reinforcing layer on one side, which reduces the production efficiency of the enhanced bubble aluminum heat insulation film blanket. Therefore, there is an urgent need to improve the production device for the enhanced bubble aluminum heat insulation film blanket to solve the defects of the prior art. UTILITY MODEL CONTENTS

[0006] In view of the deficiencies of the prior art, the utility model provides a production device for an enhanced bubble aluminum heat insulation film blanket, which improves the production efficiency of the enhanced bubble aluminum heat insulation film blanket.

[0007] In order to achieve the above object, the utility model provides the following technical scheme: a reinforced bubble aluminum heat insulation film blanket production device, including the lamination box, the upper glue roller and the lower glue roller are rotatably connected between the opposite side walls in the lamination box, two rows of the sizing roller that are adapted with the upper glue roller and the lower glue roller and are arranged horizontally are rotatably connected between the opposite side walls in the lamination box, two guide rollers that are respectively located above the upper glue roller and below the lower glue roller are rotatably connected between the opposite side walls in the lamination box, one side of the lamination box is equipped with the drive unit for driving a plurality of sizing rollers synchronous rotation, one side of the upper glue roller is equipped with the upper glue groove that is adapted, the upper glue groove one side is equipped with the glue outlet that is adapted with the upper glue roller, the lower glue roller side is equipped with the lower glue groove that is adapted, the lower glue roller lower part is immersed in the lower glue groove.

[0008] Preferably, the drive unit includes the first drive motor fixedly installed at one side of the lamination box, each of the sizing rollers is fixedly installed with the first connecting shaft extending to the outside, each of the first connecting shafts is fixedly installed with the transmission wheel at the side surface of the outside, the side surfaces of the two first connecting shafts are fixedly installed with the first gear meshing with each other, the first drive motor drives one of the first connecting shafts to rotate, and the transmission belt for transmission is sleeved between the side surfaces of the adjacent two transmission wheels.

[0009] Preferably, one end of the upper glue roller and the lower glue roller is fixedly installed with the second connecting shaft extending to the outside, the second drive motor with the output end fixedly installed with one of the second connecting shafts is fixedly installed at one side of the lamination box, and the side surfaces of the two second connecting shafts are fixedly installed with the second gear meshing with each other.

[0010] Preferably, the upper cleaning frame with one side closely attached to the side surface of the upper glue roller is fixedly installed in the lamination box, the lower cleaning frame with one side closely attached to the side surface of the lower glue roller is fixedly installed in the lamination box, the recovery box is arranged at one side of the lamination box, and the communication pipe is fixedly installed in communication between the recovery box, the upper cleaning frame and the lower cleaning frame.

[0011] Preferably, the first fixed plate is fixedly installed on the opposite side walls in the lamination box, the first adjusting bolt with one end rotatably connected to the side of the upper glue groove is threaded through and connected in the first fixed plate, and the first limiting nut for limiting is threaded connected to the side surface of the first adjusting bolt.

[0012] Preferably, the second fixed plate and the two symmetrical third fixed plates are fixedly installed on the upper part of the lower glue groove, the second adjusting bolt is threaded through and connected on the second fixed plate, the glue scraping plate with one side adapted to the side surface of the lower glue roller is rotatably connected to one end of the second adjusting bolt, the second limiting nut for limiting is threaded connected to the side surface of the second adjusting bolt, and the limiting column penetrating through the third fixed plate is fixedly connected to one of the glue scraping plates.

[0013] Preferably, the upper glue tank is fixedly installed with a limiting block at both ends, and opposite side walls in the laminating box are provided with limiting grooves matched with the limiting blocks.

[0014] In view of the defects of the prior art, the utility model provides a reinforced bubble aluminum heat insulation film blanket production device, overcomes the defects of the prior art, and has the beneficial effects that:

[0015] 1、 in the utility model, the bubble aluminum heat insulation film blanket base material made is pulled into the laminating box, the bubble aluminum heat insulation film blanket base material passes between the upper glue roller and the lower glue roller, the bubble aluminum heat insulation film blanket base material is glued on both sides by the upper glue roller and the lower glue roller, the bubble aluminum heat insulation film blanket base material and the two layers of reinforcing layers are pulled into the two rows of setting rollers at the same time, the driving unit drives a plurality of setting rollers to set the reinforcing layers and the bubble aluminum heat insulation film blanket base material, the effect that the reinforcing layers are simultaneously laminated on both sides of the bubble aluminum heat insulation film blanket base material is realized, and the production efficiency of the reinforced bubble aluminum heat insulation film blanket is further improved.

[0016] 2、 in the utility model, one side of the upper cleaning frame is elastic and tightly attached to the side of the upper glue roller, one side of the lower cleaning frame is elastic and tightly attached to the side of the lower glue roller, the upper cleaning frame and the lower cleaning frame clean the impurities adhered to the sides of the upper glue roller and the lower glue roller respectively, prevent the sides of the upper glue roller and the lower glue roller from adhering more impurities due to long-time gluing, and improve the gluing effect of the bubble aluminum heat insulation film blanket base material.

[0017] 3、 in the utility model, the distance between the upper glue tank and the side of the upper glue roller can be adjusted through the first adjusting bolt, the distance between the lower glue tank and the side of the lower glue roller can be adjusted through the second adjusting bolt, the glue layer on the sides of the upper glue roller and the lower glue roller is controlled, and the laminating effect of the bubble aluminum heat insulation film blanket base material and the reinforcing layers is improved.

[0018] Other features and advantages of the present application will be set forth in the following description of the application, and in part will become apparent to those skilled in the art upon examination of the following or can be learned by practice of the application. The objects and other advantages of the application can be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application.

[0020] Figure 1 It is a whole structure schematic view of the utility model;

[0021] Figure 2This is a schematic diagram of the internal structure of the box in this utility model;

[0022] Figure 3 This is a schematic diagram of the structure of the upper and lower coating rollers in this utility model;

[0023] Figure 4 This is a partial structural diagram of the upper glue tank in this utility model;

[0024] Figure 5 for Figure 1 Enlarged structural diagram at point A in the middle;

[0025] Figure 6 for Figure 1 Enlarged structural diagram at point B;

[0026] Figure 7 for Figure 1 Enlarged structural diagram at point C;

[0027] Figure 8 for Figure 3 Enlarged structural diagram at point D;

[0028] Figure 9 for Figure 3 Enlarged structural diagram at point E in the middle.

[0029] In the diagram: 1. Adhesive box; 2. Upper adhesive roller; 3. Lower adhesive roller; 4. Shaping roller; 5. Guide roller; 6. Drive unit; 7. First connecting shaft; 8. First drive motor; 9. Transmission wheel; 10. First gear; 11. Transmission belt; 12. Second connecting shaft; 13. Second drive motor; 14. Second gear; 15. Adhesive groove; 16. Adhesive outlet; 17. First fixing plate; 18. First adjusting bolt; 19. First limit nut; 20. Lower adhesive groove; 21. Upper cleaning frame; 22. Lower cleaning frame; 23. Recycling box; 24. Connecting pipe; 25. Second fixing plate; 26. Second adjusting bolt; 27. Adhesive scraper; 28. Second limit nut; 29. ​​Third fixing plate; 30. Limiting post; 31. Limiting block; 32. Limiting groove. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0031] Example 1

[0032] Please see Figures 1-9An enhanced bubble aluminum heat insulation film blanket production device includes a laminating box 1. An upper glue-coating roller 2 and a lower glue-coating roller 3 are rotatably connected between opposite side walls inside the laminating box 1. Two rows of shaping rollers 4, adapted to the upper glue-coating roller 2 and the lower glue-coating roller 3 and arranged horizontally, are rotatably connected between opposite side walls inside the laminating box 1. Two guide rollers 5, located above the upper glue-coating roller 2 and below the lower glue-coating roller 3 respectively, are rotatably connected between opposite side walls inside the laminating box 1. A drive unit 6 for driving several shaping rollers 4 to rotate synchronously is provided on one side of the laminating box 1. A glue-coating groove 15 adapted to the upper glue-coating roller 2 is provided on one side of the glue-coating groove 15. A glue outlet 16 adapted to the upper glue-coating roller 2 is opened on one side of the glue-coating groove 15. A lower glue-coating groove 20 adapted to the lower glue-coating roller 3 is provided on the side of the lower glue-coating roller 3. The lower part of the lower glue-coating roller 3 is immersed in the lower glue-coating groove 20.

[0033] The specific implementation method in this embodiment is as follows: Aluminum powder or aluminum foil is mixed with a foaming agent through a specific process and foamed in a heating furnace to form a bubble aluminum structure. The substrate of the bubble aluminum heat insulation film is then completed. Subsequently, the substrate is pulled into the bonding box 1 by a traction device. The substrate passes between the upper adhesive roller 2 and the lower adhesive roller 3. The upper adhesive groove 15 and the lower adhesive groove 20 contain adhesive for connecting the substrate and the reinforcing layer. The reinforcing layer includes, but is not limited to, a PET film layer. The tensile strength of the reinforcing layer bubble aluminum heat insulation film is enhanced by the two reinforcing layers. The substrate is then pulled between the upper and lower rows of shaping rollers 4 via the two guide rollers 5 and the traction device. Simultaneously, the substrate is coated with adhesive on both sides by the upper adhesive roller 2 and the lower adhesive roller 3, and then also pulled between the two rows of shaping rollers 4 (e.g., ...). Figure 2 Furthermore, the aluminum bubble insulation film substrate is located in the middle of the two sets of reinforcing layers. The shaping roller 4 can be heated, and the driving unit 6 drives several shaping rollers 4 to shape the upper and lower reinforcing layers with the aluminum bubble insulation film substrate, thereby achieving the effect of simultaneously bonding the reinforcing layers to both sides of the aluminum bubble insulation film substrate, thus improving the production efficiency of the reinforced aluminum bubble insulation film.

[0034] As a technical optimization of this utility model, the drive unit 6 includes a first drive motor 8 fixedly installed on one side of the box body 1, a first connecting shaft 7 extending to the outside fixedly installed at the end of each shaping roller 4, a transmission wheel 9 fixedly installed on the outer side of each first connecting shaft 7, and a first gear 10 meshing with each other fixedly installed on the sides of two symmetrical first connecting shafts 7. The first drive motor 8 drives one of the first connecting shafts 7 to rotate, and a transmission belt 11 for transmission is sleeved between the sides of two adjacent transmission wheels 9.

[0035] Specifically, the first drive motor 8 is started, and the output end of the first drive motor 8 drives one of the first connecting shafts 7 provided with the first gear 10 to rotate, and the first gear 10 drives the other first gear 10 engaged therewith to rotate, and the upper and lower first connecting shafts 7 rotate in opposite directions, and the upper and lower first connecting shafts 7 drive the transmission wheels 9 to rotate, and the transmission wheels 9 drive a plurality of transmission wheels 9 to rotate through the transmission belt 11, thereby realizing the synchronous rotation of the plurality of shaping rollers 4, and the upper and lower rows of shaping rollers 4 rotate in opposite directions, thereby transmitting and shaping the bubble aluminum heat insulation film blanket base material and the reinforcing layer after lamination.

[0036] As a technical optimization scheme of the utility model, the upper glue coating roller 2 and the lower glue coating roller 3 are fixedly provided with the second connecting shafts 12 extending to the outside, one side of the lamination box body 1 is fixedly provided with the second drive motor 13 with the output end fixedly provided with one of the second connecting shafts 12, and the two second connecting shafts 12 are fixedly provided with the second gears 14 engaged with each other on the side surface of the outer end.

[0037] Specifically, when the two sides of the bubble aluminum heat insulation film blanket base material are coated with glue, the second drive motor 13 is started, and the output end of the second drive motor 13 drives one of the second connecting shafts 12 to rotate, and the second connecting shaft 12 drives the other second connecting shaft 12 to rotate through the two second gears 14 engaged with each other, and the upper glue coating roller 2 and the lower glue coating roller 3 rotate in opposite directions, thereby coating the two sides of the bubble aluminum heat insulation film blanket base material with glue and achieving a certain transmission effect.

[0038] Among them, the first drive motor 8 and the second drive motor 13 in the above can be purchased in the market, which belongs to mature technology and has been fully disclosed, so the description is not repeated, the first drive motor 8 and the second drive motor 13 are provided with power connection lines, and they are electrically connected with the external main controller and 220V phase voltage (or 380V line voltage) through the power lines, and the main controller can be a conventional known device such as a computer to play a control role.

[0039] Embodiment two

[0040] Please refer to Figure 1 and Figure 3 , the embodiment includes the above-mentioned embodiment, wherein, further comprising: the lamination box body 1 is fixedly provided with an upper cleaning frame 21 abutting against one side of the upper glue coating roller 2, the lamination box body 1 is fixedly provided with a lower cleaning frame 22 abutting against one side of the lower glue coating roller 3, one side of the lamination box body 1 is provided with a recycling box 23, and the recycling box 23 is fixedly provided with a communication pipe 24 communicating between the upper cleaning frame 21 and the lower cleaning frame 22.

[0041] The specific implementation in this embodiment is that the upper cleaning frame 21 has elasticity on one side and is tightly attached to the side of the upper glue roller 2, the lower cleaning frame 22 has elasticity on one side and is tightly attached to the side of the lower glue roller 3, the upper cleaning frame 21 and the lower cleaning frame 22 clean the impurities adhered to the side of the upper glue roller 2 and the lower glue roller 3 respectively, prevent the side of the upper glue roller 2 and the lower glue roller 3 from adhering more impurities due to long-time gluing, affect the gluing effect of the bubble aluminum heat insulation film blanket base material, improve the gluing effect of the bubble aluminum heat insulation film blanket base material, and the scraped impurities fall into the upper cleaning frame 21 and the lower cleaning frame 22 and flow into the recycling box 23 through the connecting pipe 24 for recycling.

[0042] Embodiment three

[0043] Please refer to Figure 3 、 Figure 4 、 Figure 7 、 Figure 8 and Figure 9 , the embodiment includes all the above embodiments, wherein the first fixed plate 17 is fixedly installed on the opposite side walls in the fitting box 1, the first adjusting bolt 18 is threaded connected on the first fixed plate 17 and one end of the first adjusting bolt 18 is rotatably connected with the upper glue groove 15 on one side, the first limiting nut 19 is threaded connected on the side of the first adjusting bolt 18 for limiting, the second fixed plate 25 and two symmetrical third fixed plates 29 are fixedly installed on the upper part of the lower glue groove 20, the second adjusting bolt 26 is threaded connected on the second fixed plate 25, the scraping plate 27 is rotatably connected on one end of the second adjusting bolt 26 and one side of the scraping plate 27 is adapted to the side of the lower glue roller 3, the second limiting nut 28 is threaded connected on the side of the second adjusting bolt 26 for limiting, the limiting column 30 is fixedly connected on one of the scraping plate 27 and penetrates the third fixed plate 29, the limiting block 31 is fixedly installed on both ends of the upper glue groove 15, and the limiting groove 32 is formed on the opposite side walls in the fitting box 1 and is adapted to the limiting block 31.

[0044] The specific implementation in the embodiment: the distance between the upper glue tank 15 and the side surface of the upper glue roller 2 can be adjusted by rotating the first adjusting bolt 18, the upper glue tank 15 is moved by the rotation of the first adjusting bolt 18, at this time, the limiting block 31 moves in the limiting groove 32, the upper glue tank 15 is limited, the thickness of the glue layer on the upper glue roller 2 can be controlled, after the distance between the upper glue tank 15 and the side surface of the upper glue roller 2 is adjusted, the first limiting nut 19 is tightened to limit and fix the position of the upper glue tank 15, and the thickness of the glue layer on the lower glue roller 3 can be controlled by rotating the second adjusting bolt 26 which is screwed on the second fixed plate 25, the second adjusting bolt 26 drives the glue scraping plate 27 to move when rotating, the distance between the glue scraping plate 27 and the side surface of the lower glue roller 3 is adjusted, the limiting column 30 which is fixedly installed on the side surface of the glue scraping plate 27 moves on the third fixed plate 29, the position of the glue scraping plate 27 is limited, after the distance between the glue scraping plate 27 and the side surface of the lower glue roller 3 is adjusted, the second limiting nut 28 is tightened to limit and fix the position of the second adjusting bolt 26, the glue layer on the side surface of the upper glue roller 2 and the lower glue roller 3 is controlled, and the bonding effect of the air bubble aluminum heat insulation film blanket base material and the reinforcing layer is improved.

[0045] The above only provides preferred embodiments of the present application and is not intended to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacement for some technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An enhanced bubble aluminum insulation film blanket production device comprising a lamination box body (1), characterized in that, The upper glue roller (2) and the lower glue roller (3) are rotatably connected between the opposite side walls in the lamination box (1), two rows of shaping rollers (4) are rotatably connected between the opposite side walls in the lamination box (1) and are horizontally arranged and matched with the upper glue roller (2) and the lower glue roller (3), two guide rollers (5) are rotatably connected above the upper glue roller (2) and below the lower glue roller (3) respectively, a driving unit (6) is arranged on one side of the lamination box (1) and is used for driving a plurality of shaping rollers (4) to rotate synchronously, the upper glue roller (2) is provided with an upper glue groove (15) matched therewith on one side, the upper glue groove (15) is provided with a glue outlet (16) matched with the upper glue roller (2) on one side, and the lower glue roller (3) is provided with a lower glue groove (20) matched therewith on the side surface, and the lower glue roller (3) is immersed in the lower glue groove (20).

2. The apparatus for producing an enhanced bubble aluminum thermal insulation blanket according to claim 1, wherein, The driving unit (6) comprises a first driving motor (8) fixedly installed on one side of the lamination box (1), a first connecting shaft (7) extending to the outside is fixedly installed at the end of each shaping roller (4), a transmission wheel (9) is fixedly installed on the side surface of each first connecting shaft (7) located outside, first gears (10) meshing with each other are fixedly installed on the side surfaces of the upper and lower first connecting shafts (7), and the first driving motor (8) drives one of the first connecting shafts (7) to rotate.

3. The apparatus for producing an enhanced bubble aluminum thermal insulation blanket of claim 1, wherein, The upper glue roller (2) and the lower glue roller (3) are rotatably connected between the opposite side walls in the lamination box (1), two rows of shaping rollers (4) are rotatably connected between the opposite side walls in the lamination box (1) and are horizontally arranged and matched with the upper glue roller (2) and the lower glue roller (3), two guide rollers (5) are rotatably connected above the upper glue roller (2) and below the lower glue roller (3) respectively, a driving unit (6) is arranged on one side of the lamination box (1) and is used for driving a plurality of shaping rollers (4) to rotate synchronously, the upper glue roller (2) is provided with an upper glue groove (15) matched therewith on one side, the upper glue groove (15) is provided with a glue outlet (16) matched with the upper glue roller (2) on one side, and the lower glue roller (3) is provided with a lower glue groove (20) matched therewith on the side surface, and the lower glue roller (3) is immersed in the lower glue groove (20).

4. The apparatus for producing an enhanced bubble aluminum thermal insulation blanket of claim 1, wherein, The lamination box (1) is provided with an upper cleaning frame (21) fixedly installed in the lamination box (1) and abutting against the side surface of the upper glue roller (2) on one side, a lower cleaning frame (22) fixedly installed in the lamination box (1) and abutting against the side surface of the lower glue roller (3) on one side, and a recycling box (23) arranged on one side of the lamination box (1), wherein a communication pipe (24) in communication is fixedly installed between the recycling box (23) and the upper cleaning frame (21) and the lower cleaning frame (22).

5. The apparatus for producing an enhanced bubble aluminum thermal insulation blanket of claim 1, wherein, The first fixed plate (17) is fixedly installed on the opposite side walls in the lamination box (1), a first adjusting bolt (18) is screwed and penetrates through the first fixed plate (17) and is rotatably connected to one side of the upper glue groove (15), and a first limiting nut (19) is screwed and connected to the side surface of the first adjusting bolt (18) and is used for limiting.

6. The apparatus for producing an enhanced bubble aluminum thermal insulation blanket of claim 1, wherein, The lower glue tank (20) upper fixed installation has second fixed plate (25) and two symmetrical third fixed plate (29), the second fixed plate (25) is connected with second adjusting bolt (26) on the through and threaded, one end of the second adjusting bolt (26) is rotatably connected with the glue scraping plate (27) that one side is adapted to the side of lower glue roller (3), the second adjusting bolt (26) side is connected with the second limiting nut (28) for limiting, one fixed connection of the glue scraping plate (27) has the limiting column (30) that passes through third fixed plate (29).

7. The apparatus of claim 5, wherein the apparatus further comprises a second vacuum chamber. The upper glue tank (15) both ends are fixedly installed with a limiting block (31), and the opposite side walls in the fitting box body (1) are provided with a limiting groove (32) matched with the limiting block (31).

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