Textile cotton carding device for textile production
By designing a textile carding device with adjustment and cleaning components, automated roller surface cleaning was achieved, solving the problem of low efficiency in manual cleaning of traditional carding machines, improving cleaning efficiency and reducing the workload of workers.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JINAN HEAD OF TEXTILE CO LTD
- Filing Date
- 2025-06-13
- Publication Date
- 2026-05-15
AI Technical Summary
When using traditional carding machines, fibers and clumps of impurities from the cotton adhere to the roller needle cloth, requiring workers to manually clean them regularly, resulting in a large workload and low efficiency.
A textile carding device was designed, comprising an adjustment component and a cleaning component. The device uses an electric telescopic rod to drive a needle cloth brush to automatically clean the surface of the roller shaft. The needle cloth brush is fixed by fastening bolts and its position and angle can be adjusted to cover most of the roller shafts, reducing the number of manual cleaning operations.
It improves cleaning efficiency, reduces workers' workload, lowers the risk of accidents, and the needle cloth brush is replaceable or cleanable to adapt to the cleaning needs of different rollers.
Smart Images

Figure CN224243327U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of textile production, and in particular to a textile carding device for textile production. Background Technology
[0002] Carding machines are core equipment in the textile industry, mainly used to open, clean, and orient fibers (such as cotton, wool, and chemical fibers). They work together through components such as licker-in rollers, cylinders, and doffers to break down disordered fibers into single fibers, remove impurities and short fibers, and form a uniform fiber web (cotton web). This provides high-quality raw materials for spinning or nonwoven fabric production. The carding function of the carding machine directly affects yarn strength, uniformity, and finished product quality. It is widely used in cotton spinning, wool spinning, and nonwoven fabric fields and is a key machine for improving the quality of textiles.
[0003] Currently, when using carding machines, some fibers and clumps of impurities from the cotton adhere to the carding cloth on each roller. Therefore, workers need to clean them regularly with special carding cloth brushes or scrapers. However, since there are many rollers on the equipment, completing the task manually throughout the process would result in a huge workload for workers and low efficiency. In general, the traditional carding device design is not user-friendly and cannot reduce the workload of workers or improve efficiency.
[0004] Therefore, it is necessary to provide a new textile carding device for textile production to solve the above-mentioned technical problems. Utility Model Content
[0005] The technical problem solved by this utility model is to provide a textile carding device that can assist workers in efficiently cleaning the needle cloth on the roller surface while reducing their workload.
[0006] To solve the above-mentioned technical problems, the present invention provides a textile carding device for textile production, comprising: a base, a carding machine body fixedly connected to the top of the base, side guard plates fixedly connected to the top of the base on both the front and rear sides of the carding machine body, a cover provided on the top of the two side guard plates, a side bottom plate provided on both the front and rear sides of the base, and an adjustment component installed between the two side bottom plates.
[0007] The adjustment assembly includes two arc-shaped components, each fixedly connected to one of the two side base plates. An arc-shaped groove is formed on the surface of each arc-shaped component. A rotating arm is rotatably connected to the upper side of each side base plate. An inner support is slidably connected inside the rotating arm. A connecting shaft is rotatably connected to the ends of both inner supports. A rotating wheel is fixedly connected to the ends of the two connecting shafts that are relatively far apart. Several limiting holes are evenly distributed around the axis on the surface of each rotating wheel. A limiting pin is inserted into one of the limiting holes. A limiting hole is formed on the surface of each inner support, with one end of the limiting pin located inside the limiting hole.
[0008] A support is fixedly connected between the two connecting shafts. A cleaning component is installed on the surface of the support. The cleaning component includes two electric telescopic rods distributed in a front-to-back manner. Both electric telescopic rods are fixedly connected to the support. The telescopic end of the electric telescopic tube passes through the surface of the support and is fixedly connected to a fixing frame. A fixing member is provided on the inner side of the fixing frame. A needle cloth brush is adhered to the bottom of the fixing member.
[0009] As a further embodiment of this utility model, fastening bolts are symmetrically inserted into one side surface of the fixing frame, and threaded holes corresponding to the fastening bolts are opened on the surface of the fixing member, and the fastening bolts are threadedly connected to the threaded holes.
[0010] Through the above technical solution, in this device, the length and width of the needle brush bonded to the bottom of the fixing part should match the working roller shaft on the carding machine body. In this way, when the electric telescopic rod drives the needle brush to move towards and contact the designated roller shaft, the needle brush can effectively clean the surface of the working roller. Since the fixing part that fixes the needle brush is fixed to the fixing frame by fastening bolts, when the surface of the needle brush is covered with a lot of impurities, resulting in a significant decrease in its cleaning effect, the user can remove it for cleaning or replacement, and then continue the cleaning task. This design can clean some of the working rollers in the carding machine through the cleaning component, removing most of the impurities and fibers from their surface, thereby reducing the workload of workers when cleaning manually with scrapers or brushes later. At the same time, the length of the needle brush in this structure can cover the length of the working roller, and the cleaning efficiency is relatively higher than that of manual cleaning. Since the workload of workers is reduced, workers do not need to clean one side of the rotating working roller for a long time, and the probability of accidents is greatly reduced.
[0011] As a further embodiment of this utility model, positioning pins are inserted into the surfaces of both rotating arms, and a plurality of evenly distributed positioning holes are opened on the surface of the inner support, with the positioning pins passing through the positioning holes on one side.
[0012] Through the above technical solution, in this device, the end of the rotating arm and the arc-shaped part have the same axis. When the user needs to adjust the position of the cleaning component to clean other work rollers, the rotating arm can be rotated, and then the rotating arm can be fixed in the required position using locking bolts and locking nuts. After that, the extension length of the inner support is adjusted, and a positioning pin is inserted into the positioning hole for fixation. In order to better align the needle brush in the cleaning component with the work roller to be cleaned, the angle of the support in this device can be adjusted. When adjusting, rotate the support to the appropriate direction, and then make a fine adjustment again so that the second limiting hole on one side of the turntable is aligned with the first limiting hole and a limiting pin is inserted into it to limit the support. Finally, the needle brush can be effectively aligned with the designated work roller. This structure, through the design of the adjustment component, can flexibly adjust the position and direction of the cleaning component, thereby enabling surface cleaning of most work rollers.
[0013] As a further embodiment of this utility model, a central hole is provided on the surface of the rotating arm, a locking bolt is inserted into the center hole, the end of the locking bolt passes through an arc-shaped groove and is threaded with a locking nut, and a protective gasket is provided between the locking nut and the arc-shaped part.
[0014] Using the above technical solution, after rotating the rotating arm to the required angle, it can be fixed to the arc-shaped part by using locking nuts, locking bolts and protective washers.
[0015] As a further embodiment of this utility model, the front and rear ends of the cover are fixedly connected to a fixing plate, and a number of mounting bolts are sleeved on the surface of the fixing plate. The top of the side guard plate is provided with mounting holes that match the mounting bolts, and the mounting bolts are threadedly connected to the mounting holes.
[0016] With the above technical solution, the size of the base selected in the device should be able to effectively support the carding machine body, and the size of the side guards on both sides should also be able to cover the transmission components on both sides of the carding machine body. The cover is set on the upper side of the carding machine body and is fixedly connected to the side guards. When the working roller needs to be cleaned regularly, it can be removed by disassembling several mounting bolts.
[0017] As a further embodiment of this utility model, a plurality of observation plates II are fixedly connected to the surface of the cover, and observation plates I are fixedly connected to the surface of both side guards. Both observation plates II and observation plates I are made of transparent material.
[0018] The above technical solution, by setting up observation board one and observation board two, allows users to observe the carding machine body located inside the protective structure.
[0019] As a further embodiment of this utility model, ear plates are fixedly connected to both ends of the two side bottom plates, and the ear plates are fixedly connected to the side guard plate on the adjacent side by bolts and nuts.
[0020] Through the above technical solution, when the adjustment component and cleaning component are not needed, the user can disassemble and store the entire structure. The structure is reasonably designed, and the carding device has a certain self-cleaning function, which can effectively reduce the workload of workers when cleaning and maintaining several working rollers. The design is user-friendly.
[0021] Compared with related technologies, the textile carding device for textile production provided by this utility model has the following advantages:
[0022] Beneficial effects:
[0023] 1. In this utility model, the length and width of the needle brush bonded to the bottom of the fixing part should match the working roller shaft on the carding machine body. In this way, when the electric telescopic rod drives the needle brush to move towards the designated roller shaft and contact it, the needle brush can effectively clean the surface of the working roller. Since the fixing part of fixing the needle brush is fixed to the fixing frame by fastening bolts, when the surface of the needle brush is covered with a lot of impurities and its cleaning effect is significantly reduced, the user can remove it for cleaning or replacement and then continue the cleaning task. This design can clean some working rollers in the carding machine through the cleaning component, removing most of the impurities and fibers on their surface, thereby reducing the workload of workers when cleaning manually with scrapers or brushes later. At the same time, the length of the needle brush in this structure can cover the length of the working roller, and the cleaning efficiency is relatively higher than manual cleaning. Since the workload of workers is reduced, workers do not need to clean one side of the rotating working roller for a long time, and the probability of accidents is greatly reduced.
[0024] 2. In this utility model, the end of the rotating arm and the arc-shaped part have the same axis. When the user needs to adjust the position of the cleaning component to clean other work rollers, the rotating arm can be rotated, and then the rotating arm can be fixed in the required position using locking bolts and locking nuts. After that, the extension length of the inner support is adjusted, and a positioning pin is inserted into the positioning hole for fixing. In order to better align the needle brush in the cleaning component with the work roller to be cleaned, the angle of the support in this device can be adjusted. When adjusting, rotate the support to the appropriate direction, and then make a fine adjustment again so that the second limiting hole on one side of the turntable is aligned with the first limiting hole and a limiting pin is inserted into it to limit the support. Finally, the needle brush can be effectively aligned with the designated work roller. This structure, through the design of the adjustment component, can flexibly adjust the position and direction of the cleaning component, thereby enabling surface cleaning of most work rollers. Attached Figure Description
[0025] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.
[0026] Figure 1 This is a schematic diagram of the overall structure of a textile carding device for textile production according to this utility model;
[0027] Figure 2 This is a partial structural breakdown diagram of a textile carding device for textile production according to this utility model. Figure 1 ;
[0028] Figure 3 This is a partial structural breakdown diagram of a textile carding device for textile production according to this utility model. Figure 2 ;
[0029] Figure 4 This is a partial structural cross-sectional view of a textile carding device for textile production according to this utility model.
[0030] Explanation of key symbols:
[0031] 1. Base; 2. Carding machine body; 3. Side guard plate; 4. Observation plate one; 5. Cover; 6. Observation plate two; 7. Side bottom plate; 8. Adjustment assembly; 9. Cleaning assembly; 10. Electric telescopic rod; 11. Mounting bolt; 12. Mounting hole; 13. Arc-shaped component; 14. Needle cloth brush; 15. Rotating arm; 16. Locking bolt; 17. Center hole; 18. Locking nut; 19. Inner support; 20. Positioning pin; 21. Positioning hole; 22. Rotary wheel; 23. Limiting pin; 24. Limiting hole one; 25. Limiting hole two; 26. Support component; 27. Fastening bolt; 28. Fixing frame; 29. Fixing component. Detailed Implementation
[0032] Please combine Figures 1 to 4 ,in, Figure 1 This is a schematic diagram of the overall structure of a textile carding device for textile production according to this utility model; Figure 2 This is a partial structural breakdown diagram of a textile carding device for textile production according to this utility model. Figure 1 ; Figure 3 This is a partial structural breakdown diagram of a textile carding device for textile production according to this utility model. Figure 2 ; Figure 4 This is a partial structural cross-sectional view of a textile carding device for textile production according to this utility model. The textile carding device for textile production includes:
[0033] The base 1 has a carding machine body 2 fixedly connected to its top. Side guard plates 3 are fixedly connected to the top of the base 1 on both the front and rear sides of the carding machine body 2. Covers 5 are provided on the top of the two side guard plates 3. Side bottom plates 7 are provided on both the front and rear sides of the base 1. An adjustment component 8 is installed between the two side bottom plates 7.
[0034] The adjustment component 8 includes an arc-shaped component 13. Two arc-shaped components 13 are provided and fixedly connected to two side base plates 7 respectively. An arc-shaped groove is opened on the surface of the arc-shaped component 13. A rotating arm 15 is rotatably connected to the upper side of the side base plate 7. An inner support 19 is slidably connected inside the rotating arm 15. A connecting shaft is rotatably connected to the ends of the two inner supports 19. A rotating wheel 22 is fixedly connected to the ends of the two connecting shafts that are relatively far apart. A number of limiting holes 25 are evenly distributed around the axis on the surface of the rotating wheel 22. A limiting pin 23 is inserted into the limiting hole 25 on one side. A limiting hole 24 is opened on the surface of the inner support 19. One end of the limiting pin 23 is located inside the limiting hole 24.
[0035] A support member 26 is fixedly connected between the two connecting shafts. A cleaning component 9 is installed on the surface of the support member 26. The cleaning component 9 includes two electric telescopic rods 10 distributed in a front-to-back manner. Both electric telescopic rods 10 are fixedly connected to the support member 26, and the telescopic end of the electric telescopic tube passes through the surface of the support member 26 and is fixedly connected to a fixing frame 28. A fixing member 29 is provided on the inner side of the fixing frame 28, and a needle cloth brush 14 is glued to the bottom of the fixing member 29.
[0036] like Figure 1-4 As shown, fastening bolts 27 are symmetrically inserted into one side surface of the fixing bracket 28, and threaded holes corresponding to the fastening bolts 27 are opened on the surface of the fixing member 29, and the fastening bolts 27 are threadedly connected to the threaded holes.
[0037] In this device, the length and width of the needle cloth brush 14, which is attached to the bottom of the fixing member 29, should match the working roller shaft on the carding machine body 2. In this way, when the electric telescopic rod 10 drives the needle cloth brush 14 to move toward and contact the designated roller shaft, the needle cloth brush 14 can effectively clean the surface of the working roller. Since the fixing member 29 that fixes the needle cloth brush 14 is fixed to the fixing frame 28 by the fastening bolt 27, when the surface of the needle cloth brush 14 is covered with a lot of impurities, resulting in a significant decrease in its cleaning effect, the user can remove it for cleaning or replacement and then continue the cleaning task. This design can clean some of the working rollers in the carding machine through the cleaning component 9, removing most of the impurities and fibers from their surface, thereby reducing the workload of workers when cleaning manually with scrapers or brushes later. At the same time, the length of the needle cloth brush 14 in this structure can cover the length of the working roller, and the cleaning efficiency is relatively higher than that of manual cleaning. Since the workload of workers is reduced, workers do not need to clean on one side of the rotating working roller for a long time, and the probability of accidents is greatly reduced.
[0038] like Figure 1-4 As shown, positioning pins 20 are inserted into the surfaces of both rotating arms 15, and several evenly distributed positioning holes 21 are opened on the surface of the inner support 19, with the positioning pins 20 passing through the positioning holes 21 on one side.
[0039] In this device, the end of the rotating arm 15 and the arc-shaped part 13 have the same axis. When the user needs to adjust the position of the cleaning component 9 to clean other work rollers, the rotating arm 15 can be rotated, and then the rotating arm 15 can be fixed in the required position using the locking bolt 16 and the locking nut 18. After that, the extension length of the inner support 19 is adjusted, and the positioning pin 20 is inserted into the positioning hole 21 for fixation. In order to better align the needle brush 14 in the cleaning component 9 with the work roller to be cleaned, the angle of the support 26 in this device can be adjusted. When adjusting, rotate the support 26 to the appropriate direction, and then make a fine adjustment again so that the second limiting hole 25 on one side of the turntable is aligned with the first limiting hole 24 and the limiting pin 23 is inserted into it to limit the support 26. Finally, the needle brush 14 can be effectively aligned with the designated work roller. This structure, through the design of the adjustment component 8, can flexibly adjust the position and direction of the cleaning component 9, thereby enabling surface cleaning of most work rollers.
[0040] like Figure 1-4 As shown, a central hole 17 is provided on the surface of the rotating arm 15. A locking bolt 16 is inserted into the center hole 17. The end of the locking bolt 16 passes through the arc-shaped groove and is threaded to a locking nut 18. A protective gasket is provided between the locking nut 18 and the arc-shaped part 13.
[0041] After rotating the rotating arm 15 to the desired angle, it can be fixed to the arc-shaped part 13 by using the locking nut 18, locking bolt 16 and protective washer.
[0042] like Figure 1-4 As shown, the front and rear ends of the cover 5 are fixedly connected with fixing plates. Several mounting bolts 11 are sleeved on the surface of the fixing plates. The top of the side guard plate 3 is provided with mounting holes 12 that match the mounting bolts 11. The mounting bolts 11 and the mounting holes 12 are threaded together.
[0043] The base 1 selected in this device should be large enough to effectively support the carding machine body 2, and the side guards 3 on both sides should also be large enough to cover the transmission components on both sides of the carding machine body 2. The cover 5 is set on the upper side of the carding machine body 2 and is fixedly connected to the side guards 3. When the working roller needs to be cleaned regularly, it can be removed by disassembling several mounting bolts 11.
[0044] like Figure 1-4As shown, several observation plates 6 are fixedly connected to the surface of the cover 5, and observation plates 4 are fixedly connected to the surfaces of the two side guards 3. Both observation plates 6 and observation plates 4 are made of transparent material.
[0045] By setting up observation panels 4 and 6, users can observe the carding machine body 2 located inside the protective structure.
[0046] like Figure 1-4 As shown, ear plates are fixedly connected to both ends of the two side bottom plates 7. The ear plates are fixedly connected to the side guard plate 3 on the adjacent side by bolts and nuts.
[0047] In this structure, when the adjustment component 8 and cleaning component 9 are not needed, the user can disassemble and store them as a whole. The structure is reasonably designed and the carding device has a certain self-cleaning function, which can effectively reduce the workload of workers when cleaning and maintaining several working rollers. The design is user-friendly.
[0048] The working principle of the textile carding device for textile production provided by this utility model is as follows:
[0049] First step: In this device, the length and width of the needle cloth brush 14, which is attached to the bottom of the fixing part 29, should match the working roller shaft on the carding machine body 2. In this way, when the electric telescopic rod 10 drives the needle cloth brush 14 to move toward and contact the designated roller shaft, the needle cloth brush 14 can effectively clean the surface of the working roller. Since the fixing part 29 that fixes the needle cloth brush 14 is fixed to the fixing frame 28 by the fastening bolt 27, when the surface of the needle cloth brush 14 is covered with a lot of impurities, resulting in a significant decrease in its cleaning effect, the user can remove it for cleaning or replacement and then continue the cleaning task. This design can clean some of the working rollers in the carding machine through the cleaning component 9, removing most of the impurities and fibers from their surface, thereby reducing the workload of workers when cleaning manually with scrapers or brushes later. At the same time, the length of the needle cloth brush 14 in this structure can cover the length of the working roller, and the cleaning efficiency is relatively higher than manual cleaning. Since the workload of workers is reduced, workers do not need to clean on one side of the rotating working roller for a long time, and the probability of accidents is greatly reduced.
[0050] The second step: In this device, the end of the rotating arm 15 and the arc-shaped part 13 have the same axis. When the user needs to adjust the position of the cleaning component 9 to clean other work rollers, the rotating arm 15 can be rotated, and then the rotating arm 15 can be fixed in the required position using the locking bolt 16 and the locking nut 18. After that, the extension length of the inner support 19 is adjusted, and the positioning pin 20 is inserted into the positioning hole 21 for fixation. In order to better align the needle brush 14 in the cleaning component 9 with the work roller to be cleaned, the angle of the support 26 in this device can be adjusted. When adjusting, rotate the support 26 to the appropriate direction, and then make a fine adjustment again so that the second limiting hole 25 on one side of the turntable is aligned with the first limiting hole 24 and the limiting pin 23 is inserted into it to limit the support 26. Finally, the needle brush 14 can be effectively aligned with the designated work roller. This structure, through the design of the adjustment component 8, can flexibly adjust the position and direction of the cleaning component 9, thereby enabling surface cleaning of most work rollers.
[0051] It should be noted that the device structure and accompanying drawings of this utility model mainly describe the principle of this utility model. In terms of the technical aspects of this design principle, the setting of the power mechanism, power supply system and control system of the device is not fully described. However, under the premise that those skilled in the art understand the principle of the above utility model, the specific details of its power mechanism, power supply system and control system can be clearly understood. The control method in the application document is automatic control through a controller. The control circuit of the controller can be implemented by those skilled in the art through simple programming.
[0052] All standard parts used can be purchased from the market, and can be customized according to the instructions and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the existing technology. The machinery, parts and equipment adopt conventional models in the existing technology, and the structure and principle of the components known to those skilled in the art can be known by those skilled in the art through technical manuals or conventional experimental methods.
[0053] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and alterations can be made to these embodiments, or they can be used directly or indirectly, without departing from the principles and spirit of the present invention. In other related technical fields, the scope of the present invention is defined by the appended claims and their equivalents, and they are similarly included within the patent protection scope of the present invention.
Claims
1. A textile carding device for textile production, characterized in that, Includes a base (1), the top of which is fixedly connected to a carding machine body (2), and the tops of the base (1) located on the front and rear sides of the carding machine body (2) are fixedly connected to side guard plates (3), the tops of the two side guard plates (3) are provided with covers (5), and the positions of the front and rear sides of the base (1) are provided with side bottom plates (7), and an adjustment component (8) is installed between the two side bottom plates (7); The adjustment component (8) includes an arc-shaped component (13), two of which are fixedly connected to two side base plates (7) respectively. The surface of the arc-shaped component (13) is provided with an arc-shaped groove. The upper side of the side base plate (7) is rotatably connected to a rotating arm (15). The interior of the rotating arm (15) is slidably connected to an inner support (19). The ends of the two inner supports (19) are rotatably connected to a connecting shaft. The ends of the two connecting shafts that are relatively far apart are fixedly connected to a rotating wheel (22). The surface of the rotating wheel (22) is provided with several limiting holes (25) evenly distributed around the axis. A limiting pin (23) is inserted into the limiting hole (25) on one side. A limiting hole (24) is provided on the surface of the inner support (19). One end of the limiting pin (23) is located inside the limiting hole (24). A support member (26) is fixedly connected between the two connecting shafts. A cleaning component (9) is installed on the surface of the support member (26). The cleaning component (9) includes two electric telescopic rods (10) distributed front to back. Both electric telescopic rods (10) are fixedly connected to the support member (26), and the telescopic end of the electric telescopic tube passes through the surface of the support member (26) and is fixedly connected to a fixing frame (28). A fixing member (29) is provided on the inner side of the fixing frame (28), and a needle cloth brush (14) is glued to the bottom of the fixing member (29).
2. The textile carding apparatus for textile production as described in claim 1, characterized in that, The fixing bracket (28) has fastening bolts (27) symmetrically inserted on one side surface. The fixing member (29) has threaded holes corresponding to the fastening bolts (27) on its surface. The fastening bolts (27) are threadedly connected to the threaded holes.
3. The textile carding apparatus for textile production as described in claim 2, characterized in that, Positioning pins (20) are inserted into the surfaces of both rotating arms (15), and the surface of the inner support (19) is provided with several evenly distributed positioning holes (21), with the positioning pins (20) passing through the positioning holes (21) on one side.
4. The textile carding apparatus for textile production as described in claim 3, characterized in that, The rotating arm (15) has a central hole (17) on its surface. A locking bolt (16) is inserted into the central hole (17). The end of the locking bolt (16) passes through an arc-shaped groove and is threaded with a locking nut (18). A protective gasket is provided between the locking nut (18) and the arc-shaped part (13).
5. The textile carding apparatus for textile production as described in claim 4, characterized in that, The front and rear ends of the cover (5) are fixedly connected to a fixing plate. Several mounting bolts (11) are sleeved on the surface of the fixing plate. The top of the side guard plate (3) is provided with mounting holes (12) that match the mounting bolts (11). The mounting bolts (11) and the mounting holes (12) are threaded together.
6. The textile carding apparatus for textile production as described in claim 5, characterized in that, Several observation plates (6) are fixedly connected to the surface of the cover (5), and observation plates (4) are fixedly connected to the surface of the two side guards (3). Both observation plates (6) and observation plates (4) are made of transparent material.
7. The textile carding apparatus for textile production as described in claim 6, characterized in that, Both ends of the two side bottom plates (7) are fixedly connected with ear plates, which are fixedly connected to the adjacent side guard plate (3) by bolts and nuts.