Cutter for food dicing

Abstract

The utility model relates to the technical field of cutters, and discloses a food dicing cutter which comprises a base cover, inserting grooves are formed in the front side and the rear side of the left end and the right end of the base cover respectively, a plurality of T-shaped grooves are formed in the position, between the inserting grooves in the front side and the rear side, of the bottom end of the base cover, T-shaped strips are arranged on the inner walls of the T-shaped grooves respectively, and transverse cutters are fixedly connected to the bottom ends of the T-shaped strips respectively. Connecting frames are arranged at the left end and the right end of the base cover correspondingly, inserting bolts are fixedly connected to the front sides and the rear sides of the opposite ends of the connecting frames correspondingly, the shapes of the outer walls of the inserting bolts are matched with the shapes of the inner walls of the inserting grooves correspondingly, embedding grooves are formed in the front portions and the rear portions of the opposite sides of the top ends of the connecting frames correspondingly, and clamping plates are arranged on the inner walls of the embedding grooves correspondingly. And the bottom ends of the fixing blocks are fixedly connected with longitudinal cutters. According to the utility model, the transverse cutter and the longitudinal cutter in the cutter are quickly detached, so that the cutter is convenient to clean, and the influence on the cleaning work of the cutter is reduced.

Description

Technical Field

[0001] This utility model relates to the field of cutting tool technology, specifically a cutting tool for dicing food. Background Technology

[0002] In the food processing industry, the fine processing of food is a crucial step. Among them, the operation of dicing various ingredients is very common. For example, when making a vegetable salad, lettuce, cucumber, and tomatoes need to be diced into uniform small cubes. To complete these dicing tasks efficiently and with high quality, it is necessary to use appropriate knife structures.

[0003] Currently, some dicing knives used in food processing have certain drawbacks. In order to meet the dicing requirements, multiple blades need to be assembled and fixed in a corresponding arrangement. Therefore, the assembly steps are numerous and cumbersome. During cleaning, the inconvenience of disassembly affects the cleaning of the blades. Furthermore, food tends to adhere to the blade surface during dicing, interfering with the cutting process and reducing the efficiency and quality of food dicing.

[0004] In order to facilitate subsequent cleaning and allow for easy disassembly of the knife, this application proposes a food dicing knife. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a food dicing knife with a quick-release cross-cutting blade and a longitudinal cutting blade for easy cleaning.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a food dicing knife, comprising a base cover, slots on both the left and right ends and the front and rear sides of the base cover, and a plurality of T-shaped grooves on the bottom end of the base cover between the front and rear slots. T-shaped strips are provided on the inner walls of each T-shaped groove, and a cross-cutting blade is fixedly connected to the bottom end of each T-shaped strip. Connecting frames are provided on both the left and right ends of the base cover, and pins are fixedly connected to the front and rear sides of opposite ends of each connecting frame. The shape of the outer wall of each pin corresponds to the shape of the inner wall of the slot. The connecting frame has fitting grooves on both the front and back sides of its top, opposite sides. Each fitting groove has a locking plate on its inner wall. Each locking plate on both the front and back sides has a fixing block fixedly connected to its opposite end. Each fixing block has a longitudinal cutting blade fixedly connected to its bottom end. Each locking plate on both the front and back sides has a positioning hole on its opposite inner wall. Each base cover has a plug-in block fixedly connected to both the left and right sides of its front and back ends. Each connecting frame has a folding plate fixedly connected to its front and back ends near the base cover. Each folding plate on both the left and right sides has a hole or groove on its opposite inner wall.

[0007] Further description: Each of the insert blocks has a push plate slidably connected to its inner wall. Each of the push plates on both the front and rear sides has a limit block fixedly connected to the middle of its opposite end. The shape of the outer wall of the limit block matches the shape of the inner wall of the slot. Each of the push plates on both the front and rear sides has a spring fixedly connected to its opposite end. The other end of each spring is fixedly connected to the inner wall of the insert block. Here, the spring has a certain elastic support, which can keep the outward end of the push plate and the inner wall of the square slot at the same horizontal plane.

[0008] Further description: Push-pull brackets are slidably connected to the upper and lower inner walls of the opposite ends of the plug blocks on both the front and rear sides. The upper and lower parts of the opposite ends of the push-pull brackets on both the front and rear sides are respectively fixedly connected to the upper and lower parts of the opposite ends of the push plates on both the front and rear sides. Here, the push-pull brackets are semi-enclosed, and the upper and lower sides are at the same horizontal position as the upper and lower sides of one end of the push plate.

[0009] Further description: The opposite ends of the plug blocks on both the left and right sides, away from the base cover, are provided with square grooves. The shapes of the opposite ends of the folding plates on both the left and right sides are matched with the shapes of the inner walls of the square grooves. Here, one end of the folding plate extends and is bent at 90° so as to be inserted into the square groove.

[0010] Further description: The connecting frame has a curved plate slidably connected to the inner wall of the fitting groove on the side facing the base cover at both ends. The inner walls of the opposite ends of the curved plate are fixedly connected to the anti-movement bolts. The shape of the opposite ends of the anti-movement bolts on both sides matches the shape of the inner wall of the positioning hole. Here, the two ends of the curved plate are bent and the outer wall of the anti-movement bolt is circular.

[0011] Further description: Track rods are slidably connected to both the front and rear sides of the inner wall of the curved plate. The left and right ends of the track rods are fixedly connected to the inner wall of the connecting frame. Springs II are fixedly connected to the inner wall of the curved plate outside the track rods. The other end of each spring II is fixedly connected to the inner wall of the connecting frame. Here, spring II generates elastic potential energy when compressed. The track rods can provide a horizontal trajectory for the sliding of the curved plate and prevent spring II from flipping when compressed.

[0012] Further description: Each of the transverse cutting blades is fitted with a scraper sleeve one, and each of the longitudinal cutting blades is fitted with a scraper sleeve two. Each of the left and right ends of the scraper sleeve one is fixedly connected with a connecting rod. The opposite ends of the connecting rods on the left and right sides are respectively fixedly connected to the opposite ends of the scraper sleeve two. Each of the front and rear transverse cutting blades has an extension rod fixedly connected to the middle of the opposite ends. Here, the scraper sleeves are all made of hard material. The connecting rods enable the connection between the scraper sleeve one and the scraper sleeve two, and the inner walls of the scraper sleeves are in contact with the outer walls of the blades.

[0013] Further description: Each of the opposite ends of the extension rod is fixedly connected to a vertical plate, and each of the vertical plates is fixedly connected to a concave frame. The inner wall of the bottom end of each concave frame is threaded with bolts that penetrate both the inner and outer sides of the concave frame. Each bolt has a rubber pad fixedly connected to its top. Here, the rubber pad is made of hard rubber and has an anti-slip surface on top. The size of the opening of the concave frame can be manufactured according to the actual side size of the conveying device.

[0014] Beneficial effects:

[0015] 1. In this utility model, the two side retaining blocks and longitudinal cutting blades are disassembled through the cooperation of the bending plate, the track rod, the second spring, the blocking bolt, the locking plate, and the positioning hole. The two side connecting frames are quickly disassembled through the cooperation of the plug block, the push plate, the limiting block, the push-pull bracket, the first spring, the square groove, the folding plate, and the hole groove. After the two ends of the base cover are blocked, the T-shaped strip can be pulled out from the T-shaped groove, and the cross-cutting blade is removed from the bottom of the base cover. Thus, the cross-cutting blade and longitudinal cutting blade in this utility model are quickly disassembled, which is convenient for cleaning and reduces the impact on the cleaning of the tool.

[0016] 2. In this utility model, by using scraper sleeve one and scraper sleeve two to fit onto the surface of the cross-cutting blade and the longitudinal cutting blade, the cross-cutting blade and the longitudinal cutting blade will pass through scraper sleeve one and scraper sleeve two when they are pushed down, and then cut the food. When food is attached to the surface of the cross-cutting blade and passes through the bottom of scraper sleeve one and scraper sleeve two, it will be blocked and pushed off, thereby preventing food from adhering to the blade surface, interfering with the cutting, and reducing the efficiency and quality of food dicing. Attached Figure Description

[0017] Figure 1 This is a perspective view of a food dicing knife according to the present invention;

[0018] Figure 2 This is a schematic diagram of the base cover structure of a food dicing knife according to the present invention;

[0019] Figure 3 This is a schematic diagram of the connecting frame structure of a food dicing knife according to the present invention;

[0020] Figure 4 This is a cross-sectional view of the insert block of a food dicing knife according to the present invention;

[0021] Figure 5 This is a schematic diagram of the curved plate structure of a food dicing knife according to the present invention;

[0022] Figure 6 This is a schematic diagram of the retaining block structure of a food dicing knife according to the present invention;

[0023] Figure 7 This is a schematic diagram of the T-shaped strip structure of a food dicing knife according to the present invention;

[0024] Figure 8 This is a schematic diagram of the scraper sleeve of a food dicing knife according to the present invention.

[0025] In the diagram: 1. Base cover; 2. Connecting frame; 3. Fixing block; 4. Cross cutter; 5. Longitudinal cutter; 6. Scraper sleeve one; 7. Connecting rod; 8. Scraper sleeve two; 9. T-slot; 10. Slot; 11. Insertion block; 12. Insert bolt; 13. Folding plate; 14. Hole slot; 15. Clamping plate; 16. Bend plate; 17. Push plate; 18. Limiting block; 19. Push-pull frame; 20. Square slot; 21. Spring one; 22. Track rod; 23. Spring two; 24. Anti-movement bolt; 25. Fitting groove; 26. Positioning hole; 27. T-strip; 28. Extension rod; 29. ​​Vertical plate; 30. Concave frame; 31. Bolt; 32. Rubber pad. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Example 1

[0028] Please see Figure 1 , Figure 3 as well as Figures 6-7 A food dicing knife includes a base cover 1. Slots 10 are provided on both the left and right ends and the front and back sides of the base cover 1. Several T-shaped grooves 9 are provided on the bottom of the base cover 1 between the front and back slots 10. T-shaped strips 27 are provided on the inner walls of each T-shaped groove 9. A cross-cutting blade 4 is fixedly connected to the bottom of each T-shaped strip 27. Connecting frames 2 are provided on both the left and right ends of the base cover 1. Inserts 12 are fixedly connected to the front and back sides of opposite ends of the connecting frames 2. The shape of the outer wall of the inserts 12 matches the shape of the inner wall of the slot 10. The tops of the connecting frames 2 are opposite to each other. Both the front and rear sides of one side are provided with fitting grooves 25, and the inner walls of the fitting grooves 25 are provided with locking plates 15. The opposite ends of the locking plates 15 on the front and rear sides are fixedly connected with retaining blocks 3. The bottom ends of the retaining blocks 3 are fixedly connected with longitudinal cutting blades 5. The inner walls of the opposite ends of the locking plates 15 on the front and rear sides are provided with positioning holes 26. The front and rear ends of the base cover 1 are fixedly connected with plug-in blocks 11 on the left and right sides. The front and rear ends of the connecting frame 2 are fixedly connected with folding plates 13 on the side near the base cover 1. The inner walls of the opposite ends of the folding plates 13 on the left and right sides are provided with holes and grooves 14.

[0029] To explain further, firstly, the mounting head on the top of the base cover 1 is connected to the drive end of a linear stroke drive component such as a hydraulic rod or an electric push rod. Then, the drive component and the cutter are installed above the conveying device. When the conveying device transports the food to the right longitudinal cutter 5, the drive component pushes the base cover 1 to move down intermittently. The right longitudinal cutter 5 cuts the food into segments. Subsequently, the segments of food pass through the bottom of multiple transverse cutters 4 and are cut into several strips. When the food moves to the left longitudinal cutter 5, it is continuously cut into several small pieces, thus completing the food dicing process.

[0030] Example 2

[0031] Please see Figure 2 , Figure 4 as well as Figure 5 Further, based on Embodiment 1, push plates 17 are slidably connected to the inner walls of the plug-in blocks 11. Limiting blocks 18 are fixedly connected to the middle of the opposite ends of the front and rear push plates 17. The shape of the outer wall of the limiting blocks 18 matches the shape of the inner wall of the slot 14. Springs 21 are fixedly connected to the opposite ends of the front and rear push plates 17. The other ends of the springs 21 are fixedly connected to the inner walls of the plug-in blocks 11. Push-pull brackets 19 are slidably connected to the upper and lower inner walls of the opposite ends of the front and rear plug-in blocks 11. The upper and lower parts of the opposite ends of the front and rear push-pull brackets 19 are respectively fixedly connected to the upper and lower parts of the opposite ends of the front and rear push plates 17. The opposite ends of the left and right plug-in blocks 11 are open on the side away from the base cover 1. A square groove 20 is provided. The shape of the opposite end of the left and right side folding plates 13 is matched with the shape of the inner wall of the square groove 20. The front and rear ends of the connecting frame 2 are slidably connected to the inner wall of the fitting groove 25 facing the base cover 1. The front and rear sides of the opposite end of the bending plate 16 are fixedly connected to the inner wall of the connecting frame 2. The shape of the opposite end of the left and right side folding plates 24 is matched with the shape of the inner wall of the positioning hole 26. The front and rear sides of the inner wall of the bending plate 16 are slidably connected to the track rod 22. The left and right ends of the track rod 22 are fixedly connected to the inner wall of the connecting frame 2. The inner wall of the bending plate 16 is fixedly connected to the outside of the track rod 22. The other end of the spring 23 is fixedly connected to the inner wall of the connecting frame 2.

[0032] To further explain, when it is necessary to clean the cross-cutting blade 4 and longitudinal cutting blade 5 in the cutting tool, the bending plate 16 can be pushed outward first. The bending plate 16 will slide on the outer wall of the track rod 22 and squeeze the spring 23. At the same time, the inner wall of one end of the bending plate 16 will drive the blocking bolt 24 to disengage from the inner wall of the positioning hole 26, releasing the limitation of the locking plate 15 on this side. Then, the retaining block 3 and longitudinal cutting blade 5 on this side can be removed from the connecting frame 2. The locking plates 15 on both sides will also disengage from the fitting groove 25. The retaining block 3 and longitudinal cutting blade 5 on the other side can be removed in the same way.

[0033] Next, press the push-pull brackets 19 on both the front and rear sides simultaneously, causing them to push the push plate 17 to slide on the inner wall of the plug block 11 and squeeze the spring 21. The push plate 17 moves to one side of the base cover 1 with the limiting block 18. The limiting block 18 disengages from the slot 14, releasing the limiting of the folding plate 13. The corresponding connecting bracket 2 on this side is removed from one end of the base cover 1, and the plug 12 is pulled out from the corresponding slot 10. The connecting bracket 2 on the other side is removed in the same way, so that there are no obstructing parts at both ends of the base cover 1. Finally, the T-shaped strip 27 is pulled out from the T-shaped groove 9, and the cross-cutting blade 4 is removed from the bottom of the base cover 1, completing the quick disassembly of the blade for easy cleaning.

[0034] Example 3

[0035] Please see Figure 8 Based on Embodiment 1, the outer wall of the transverse cutter 4 is fitted with a scraper sleeve 1 6, and the outer wall of the longitudinal cutter 5 is fitted with a scraper sleeve 2 8. The left and right ends of the scraper sleeve 1 6 are fixedly connected with connecting rods 7. The opposite ends of the left and right connecting rods 7 are respectively fixedly connected to the opposite ends of the scraper sleeve 2 8. The middle of the opposite ends of the transverse cutter 4 on both the front and rear sides is fixedly connected with an extension rod 28. The opposite ends of the extension rods 28 are fixedly connected with a vertical plate 29. The bottom end of the vertical plate 29 is fixedly connected with a concave frame 30. The inner wall of the bottom end of the concave frame 30 is threaded with bolts 31 that penetrate the inner and outer sides of the concave frame 30. The top of the bolts 31 is fixedly connected with rubber pads 32.

[0036] To further explain, after installing the drive components and blades above the conveying device, scraper sleeve 1 6 and scraper sleeve 2 8 are arranged in the order of cross-cutting blade 4 and longitudinal cutting blade 5, and are fitted onto the surfaces of cross-cutting blade 4 and longitudinal cutting blade 5. The concave frames 30 on both sides are placed on both sides of the conveying frame and clamped to the side of the conveying device. The bolt 31 is rotated, and the bolt 31 spirals upward, causing the rubber pad 32 to contact the bottom of the conveying device, thereby clamping the conveying device and providing stability for scraper sleeve 1 6 and scraper sleeve 2 8. When the cross-cutting blade 4 and longitudinal cutting blade 5 move down to cut food, they will pass through scraper sleeve 1 6 and scraper sleeve 2 8. When the food attached to the surface of the cross-cutting blade 4 and longitudinal cutting blade 5 passes the bottom of scraper sleeve 1 6 and scraper sleeve 2 8, it will be blocked and pushed off, preventing food from adhering to the blade surface and interfering with the cutting.

[0037] Working principle: First, the top mounting head of the base cover 1 is connected to the drive end of a linear stroke drive component such as a hydraulic rod or electric push rod. Then, the drive component and the cutter are installed on the upper side of the conveying device. When the conveying device transports the food to the right longitudinal cutter 5, the drive component will push the base cover 1 to move down intermittently. At this time, the right longitudinal cutter 5 will cut the food into segments. Then, after the segments of food pass the bottom of multiple transverse cutters 4, they will be cut into several strips until the food moves to the left longitudinal cutter 5 and is continuously cut into several small pieces, thus completing the food dicing work.

[0038] When it is necessary to disassemble and clean the cross-cutting blade 4 and longitudinal cutting blade 5 in the cutting tool, push the bending plate 16 outward, so that the bending plate 16 slides on the outer wall of the track rod 22 and squeezes the spring 23. At the same time, the inner wall of one end of the bending plate 16, along with the locking bolt 24, disengages from the inner wall of the positioning hole 26, thereby releasing the restriction on the locking plate 15 on that side. Then, pull the retaining block 3 and the longitudinal cutting blade 5 on that side out from between the connecting frame 2, and the locking plates 15 on both sides will also disengage from the fitting groove 25. After that, remove the retaining block 3 and the longitudinal cutting blade 5 on the other side according to the above steps. Then, press the push-pull brackets 19 on the front and rear sides simultaneously to push the push plate 17 into the insertion block 11. The wall slides and squeezes the spring 21. At the same time, the push plate 17 moves the limiting block 18 towards the base cover 1, causing the limiting block 18 to disengage from the slot 14, thereby releasing the limiting of the folding plate 13. Then, the corresponding connecting bracket 2 on this side is removed from one end of the base cover 1, and the plug 12 is pulled out from the corresponding slot 10. Then, the connecting bracket 2 on the other side is removed in the same way, so that there are no obstructing parts at both ends of the base cover 1. Then, the T-shaped strip 27 is pulled out from the T-shaped groove 9, and the cross-cutting blade 4 is removed from the bottom of the base cover 1. Thus, the quick disassembly of the cross-cutting blade 4 and the longitudinal cutting blade 5 in the blade is completed, so that the cross-cutting blade 4 and the longitudinal cutting blade 5 can be cleaned.

[0039] After installing the drive components and blades on the upper side of the conveying device, place scraper sleeve 1 6 and scraper sleeve 2 8 in the order of cross-cutting blade 4 and longitudinal cutting blade 5, and then fit them onto the surfaces of cross-cutting blade 4 and longitudinal cutting blade 5. Next, place the concave frames 30 on both sides of the conveying frame and clamp them onto the sides of the conveying device. Then, rotate the bolt 31 so that the bolt 31 spirals upward and contacts the bottom of the conveying device with the rubber pad 32, thereby forming a clamp on the conveying device and providing stability for scraper sleeve 1 6 and scraper sleeve 2 8. Then, the cross-cutting blade 4 and longitudinal cutting blade 5 are pushed down and pass through scraper sleeve 1 6 and scraper sleeve 2 8 to cut the food. When the food attached to the surface of the cross-cutting blade 4 and longitudinal cutting blade 5 passes through the bottom of scraper sleeve 1 6 and scraper sleeve 2 8, it will be blocked and pushed down, thereby preventing the food from adhering to the blade surface and interfering with the cutting.

[0040] 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 without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A food dicing knife, comprising a base cap (1), characterized in that: The base cover (1) has slots (10) on both the left and right ends and on both the front and back sides. The bottom of the base cover (1) has several T-shaped grooves (9) between the slots (10) on both the front and back sides. The inner walls of the T-shaped grooves (9) are provided with T-shaped strips (27). The bottom ends of the T-shaped strips (27) are fixedly connected with cross-cutting blades (4). The base cover (1) has connecting frames (2) on both the left and right ends. The connecting frames (2) have pins (12) fixedly connected on both the front and back sides of opposite ends. The shape of the outer wall of the pins (12) matches the shape of the inner wall of the slots (10). The top of the connecting frames (2) has openings on both the front and back sides. The fitting groove (25) is provided, and the inner wall of the fitting groove (25) is provided with a locking plate (15). The locking plates (15) on the front and rear sides are fixedly connected to a retaining block (3) at one end. The bottom of the retaining block (3) is fixedly connected to a longitudinal cutter (5). The inner wall of the locking plates (15) on the front and rear sides is provided with a positioning hole (26). The base cover (1) is fixedly connected to the left and right sides of the front and rear ends. The connecting frame (2) is fixedly connected to the side of the front and rear ends near the base cover (1). The inner wall of the folding plates (13) on the left and right sides is provided with a hole groove (14).

2. The food dicing knife according to claim 1, characterized in that: The inner wall of each plug-in block (11) is slidably connected to a push plate (17). The middle of the opposite ends of the push plates (17) on both the front and rear sides is fixedly connected to a limit block (18). The shape of the outer wall of the limit block (18) matches the shape of the inner wall of the slot (14). The opposite ends of the push plates (17) on both the front and rear sides are fixedly connected to a spring (21). The other end of the spring (21) is fixedly connected to the inner wall of the plug-in block (11).

3. The food dicing knife according to claim 1, characterized in that: The upper and lower inner walls of the opposite ends of the plug-in blocks (11) on the front and rear sides are slidably connected with push-pull brackets (19). The upper and lower parts of the opposite ends of the push-pull brackets (19) on the front and rear sides are respectively fixedly connected to the upper and lower parts of the opposite ends of the push plates (17) on the front and rear sides.

4. The food dicing knife according to claim 1, characterized in that: The plug-in blocks (11) on both the left and right sides have square grooves (20) on the opposite side away from the base cover (1), and the shapes of the opposite ends of the folding plates (13) on both the left and right sides are in line with the shape of the inner wall of the square groove (20).

5. A food dicing knife according to claim 1, characterized in that: The connecting frame (2) has a curved plate (16) slidably connected to the inner wall of the fitting groove (25) facing the base cover (1) at both ends. The inner walls of the front and rear sides of the curved plate (16) are fixedly connected to the blocking bolts (24). The shape of the opposite end of the blocking bolts (24) on the left and right sides matches the shape of the inner wall of the positioning hole (26).

6. A food dicing knife according to claim 5, characterized in that: The inner wall of the bent plate (16) is slidably connected to the front and rear sides of the inner wall, and the left and right ends of the track rod (22) are fixedly connected to the inner wall of the connecting frame (2). The inner wall of the bent plate (16) located outside the track rod (22) is fixedly connected to the second spring (23), and the other end of the second spring (23) is fixedly connected to the inner wall of the connecting frame (2).

7. A food dicing knife according to claim 1, characterized in that: The outer wall of the cross-cutting blade (4) is fitted with a scraper sleeve (6), and the outer wall of the longitudinal cutting blade (5) is fitted with a scraper sleeve (8). The left and right ends of the scraper sleeve (6) are fixedly connected with connecting rods (7). The opposite ends of the connecting rods (7) on the left and right sides are respectively fixedly connected to the opposite ends of the scraper sleeve (8). The middle of the opposite ends of the cross-cutting blades (4) on the front and rear sides is fixedly connected with an extension rod (28).

8. A food dicing knife according to claim 7, characterized in that: Each of the extension rods (28) has a vertical plate (29) fixedly connected to one end opposite to the other. Each of the vertical plates (29) has a concave frame (30) fixedly connected to the bottom end. Each of the concave frames (30) has a bolt (31) threadedly connected to the inner wall of the bottom end of the concave frame (30) and passes through both the inner and outer sides of the concave frame (30). Each of the bolts (31) has a rubber pad (32) fixedly connected to the top end.

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