Strip-shaped box folding mechanism
By designing a strip box folding device that includes a forming base plate, upper and lower long-side folding plates, guide plates, and a short-side folding mechanism, the problem of requiring manual assistance for complex boxes in the existing technology is solved, and automated and efficient folding is achieved.
Patent Information
- Application Number
- CN202520052705.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-09
- Publication Date
- 2025-12-23
- Estimated Expiration
- 2035-01-09
AI Technical Summary
Existing folding devices for bar boxes require manual assistance when dealing with complex boxes, resulting in low work efficiency.
Design a folding mechanism that includes a forming base plate, upper and lower long-side folding plates, guide plates, cardboard support, and short-side folding mechanism. Control the cardboard to fold multiple times through a drive mechanism to automate the folding of complex boxes.
It enables automated folding of complex boxes, improving work efficiency and ensuring the integrity and stability of the folding process.
Smart Images
Figure CN223701861U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the packaging folding technical field, concretely relates to a strip-shaped box folding mechanism. BACKGROUND
[0002] With the development of automation technology, the folding device of strip-shaped box is also constantly improved, and it is understood that the existing market carton folding device uses the working principle of a cylinder, sets a groove grinding tool of a preset size, obtains a formed carton by pressing and punching the paperboard to be folded to the grinding tool, and the folding device can only fold some relatively simple boxes, and once the box is a little complex, manual cooperation is needed to complete, resulting in relatively low work efficiency. CONTENT OF THE UTILITY MODEL
[0003] The utility model aims at providing a strip-shaped box folding mechanism to solve the above problems in the prior art.
[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:
[0005] A strip-shaped box folding mechanism, comprising a forming bottom plate, a lower long-edge folding plate, an upper long-edge folding plate, a front guide plate, a paperboard support, a right side short-edge folding plate, a left side short-edge folding plate and a rear guide plate, a folding plate avoiding hole is formed in the middle part of the forming bottom plate, the front guide plate is installed above the forming bottom plate on one side of the folding plate avoiding hole, and the front guide plate and the forming bottom plate cooperate to form a product inlet; the rear guide plate is installed above the forming bottom plate on the other side of the folding plate avoiding hole, and the rear guide plate and the forming bottom plate cooperate to form a forming bin;
[0006] The lower end of one side of the forming bottom plate is provided with a paperboard support, so as to place the paperboard to be folded on the paperboard support, and when the paperboard to be folded is placed on the paperboard support, the middle part of the paperboard to be folded is aligned with the product inlet, so that the product pushes the middle part of the paperboard to be folded through the product inlet into the forming bin;
[0007] The upper long-edge folding plate is arranged above the folding plate avoiding hole between the front guide plate and the rear guide plate, and the upper long-edge folding plate is connected with a first driving mechanism, so as to control the downward movement of the upper long-edge folding plate through the first driving mechanism and make the paperboard to be folded complete the upper folding;
[0008] The lower long-edge folding plate is arranged below the folding plate avoiding hole, and the lower long-edge folding plate is connected with a second driving mechanism, so as to control the upward movement of the lower long-edge folding plate through the second driving mechanism and make the paperboard to be folded complete the lower folding;
[0009] The right side short-edge folding plate and the left side short-edge folding plate are arranged on both sides of the forming bin respectively, so as to complete the short-edge folding of the short edges on both sides of the paperboard to be folded through the right side short-edge folding plate and the left side short-edge folding plate.
[0010] As one preferred technical scheme in the utility model, two paper stopping plates are installed on the front guide plate to limit the two sides of the paper to be folded through the two paper stopping plates.
[0011] As one preferred technical scheme in the utility model, the first driving mechanism comprises an upper folding cross beam, sliding guide columns and an upper folding driving assembly for driving the sliding guide columns to move up and down, the upper folding cross beam is connected with the upper long-side folding plate, the two ends of the upper folding cross beam are connected with the sliding guide columns, and the two sliding guide columns vertically penetrate through the formed bottom plate.
[0012] As one preferred technical scheme in the utility model, the two sliding guide columns are slidably connected with the formed bottom plate through linear bearings, and the linear bearings are installed on the formed bottom plate.
[0013] As one preferred technical scheme in the utility model, the first driving mechanism further comprises a guide column connecting beam and an upper folding articulated joint, the guide column connecting beam is arranged below the formed bottom plate, the two ends of the guide column connecting beam are respectively connected with the two sliding guide columns, the upper folding articulated joint is installed on the guide column connecting beam, the upper folding articulated joint is connected with the upper folding driving assembly, and the upper folding articulated joint is controlled to move up and down through the upper folding driving assembly.
[0014] As one preferred technical scheme in the utility model, the second driving mechanism comprises a lower edge vertical sliding rail seat, a vertical sliding rail, a lower folding support, a lower edge seat and a lower folding driving assembly for driving the lower edge seat to move up and down, the lower edge vertical sliding rail seat is connected with the lower long-side folding plate and the lower edge seat, the vertical sliding rail is installed on the lower folding support in the vertical direction, and the lower edge vertical sliding rail seat is slidably connected on the vertical sliding rail.
[0015] As one preferred technical scheme in the utility model, the lower folding support is fixedly connected with the formed bottom plate.
[0016] As one preferred technical scheme in the utility model, the right side short edge folding and the left side short edge folding both comprise a fixing base, a linear guide rail, a folder, a front fixed corner folder, a front fixed corner folder base, a mounting base and a cylinder, the linear guide rail, the front fixed corner folder base and the cylinder are all mounted on the fixing base, the mounting base is slidably connected on the linear guide rail, the folder is connected on the mounting base, the telescopic rod of the cylinder is connected with the mounting base, so as to drive the mounting base to slide on the linear guide rail through the cylinder; the folder is provided with a folding lug close to the outside of one side of the middle part of the forming bin, the side of the folding lug facing the product inlet is an inclined surface, so as to limit the short edge of the paperboard to be folded through the folding lug and make it fold backward; the other side of the folding lug away from the product inlet is a pressing edge plane, so as to drive the pressing edge plane to slide to the outlet direction of the forming bin through the sliding of the folder, and then further drive the short edge of the paperboard to be folded to fold backward; the front fixed corner folder base is located on the side of the folder away from the product inlet, the front fixed corner folder is mounted on the side of the front fixed corner folder base close to the middle part of the forming bin, so as to limit the short edge of the paperboard after folding backward through the two front fixed corner folders.
[0017] As one preferred technical scheme in the utility model, the paperboard support comprises a vertical extension plate and a support plate, the upper end of the vertical extension plate is fixedly connected with the forming bottom plate, the lower end of the vertical extension plate is fixedly connected with one end of the support plate, the other end of the support plate extends away from the forming bottom plate and is arranged at an acute angle with the support plate.
[0018] Beneficial effects: the utility model with the help of the thrust of the product, the paperboard to be folded is pushed into the forming bin from the product inlet, and the paperboard to be folded is limited by the forming bottom plate and the front guide plate to complete three-side folding, then the upper and lower long edges of the paperboard to be folded are folded through the upper long edge folding plate and the lower long edge folding plate, finally the short edges of the paperboard to be folded on both sides are folded through the right side short edge folding and the left side short edge folding, so that the whole packaging and folding of the paperboard to be folded can be completed, the whole folding mechanism is concentrated together, the folding work more complicated than the prior art is completed, and the work efficiency is ensured. BRIEF DESCRIPTION OF DRAWINGS
[0019] Figure 1 It is a structure schematic view under the first visual angle of the utility model;
[0020] Figure 2 It is a structure schematic view under the second visual angle of the utility model;
[0021] Figure 3 It is a schematic view when the paperboard to be folded is placed under the first visual angle of the utility model;
[0022] Figure 4 It is a schematic view when the rear guide plate is not arranged under the second visual angle of the utility model;
[0023] Figure 5 This is a schematic diagram of the structure with the right short side folded and the left short side folded.
[0024] In the diagram: 31-forming base plate; 32-lower long side folding plate; 33-upper long side folding plate; 34-upper folding crossbeam; 35-sliding guide post; 36-linear bearing; 37-front guide plate; 38-cardboard bracket; 39-upper folding joint; 40-board stop; 41-lower scraper edge vertical slide rail seat; 42-vertical slide rail; 43-lower folding support; 44-forming chamber; 45-right short side fold; 46-left short side fold; 47-guide post connecting beam; 48-lower scraper edge seat; 49-rear guide plate; 1-fixed seat; 2-linear guide rail; 3-folder; 4-front fixed corner folder; 5-front fixed corner folder seat; 6-mounting seat. Detailed Implementation
[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the present utility model will be briefly introduced below in conjunction with the accompanying drawings and descriptions of the embodiments or the prior art. Obviously, the following description of the structure of the accompanying drawings is only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. It should be noted that the description of these embodiments is used to help understand this utility model, but does not constitute a limitation on this utility model.
[0026] Example:
[0027] like Figures 1-5 As shown, this embodiment provides a strip box folding mechanism, including a forming base plate 31, a lower long-side folding plate 32, an upper long-side folding plate 33, a front guide plate 37, a cardboard support 38, a right short-side folding plate 45, a left short-side folding plate 46, and a rear guide plate 49. A folding plate clearance hole is provided in the middle of the forming base plate 31, thus dividing the forming base plate 31 into two sides around the folding plate clearance hole. A front guide plate 37 is installed above the forming base plate 31 on the side with the folding plate clearance hole. The front guide plate 37 can be connected to the two sides of the front guide plate 37 via... The forming base plate 31 is connected to the plate to ensure the stability of the front guide plate 37, while not affecting the cooperation between the front guide plate 37 and the forming base plate 31 to form the product entrance, that is, the entrance for the product packaged by the folded cardboard to enter the folding mechanism of this strip box; a rear guide plate 49 is installed on the top of the forming base plate 31 on the other side of the folding plate avoidance hole, and the forming base plate 31 can be connected to the rear guide plate 49 on both sides by connecting plates to ensure the stability of the rear guide plate 49, while not affecting the cooperation between the rear guide plate 49 and the forming base plate 31 to form the forming chamber 44.
[0028] On the basis of the above structure, further, the lower end of the forming bottom plate 31 side is provided with a paperboard support 38, so as to place the to-be-folded paperboard on the paperboard support 38, and when the to-be-folded paperboard is placed on the paperboard support 38, the middle part of the to-be-folded paperboard (generally, the paper box has a sealing side, and the middle part here can be understood as the side corresponding to the sealing side, and for the strip-shaped paper box, the middle part here is preferably the side where the long edge is located) is aligned with the product inlet, so as to facilitate the product to push the middle part of the to-be-folded paperboard through the product inlet into the forming bin 44, and then make the two large faces connected with the middle part of the to-be-folded paperboard complete folding under the limiting of the forming bottom plate 31 and the front guide plate 37, and directly complete the three-face folding of the large face and the long edge on one side of the strip-shaped box when entering the forming bin 44 through the product inlet.
[0029] Further, the upper long edge folding plate 33 is arranged above the folding plate avoiding hole between the front guide plate 37 and the rear guide plate 49, and the upper long edge folding plate 33 is connected with a first driving mechanism, so as to control the upper long edge folding plate 33 to move downward by the first driving mechanism and make the to-be-folded paperboard complete upper folding, and when the upper long edge folding plate 33 moves downward, a downward force is given to the upper end of the to-be-folded paperboard, so as to drive the upper end of the to-be-folded paperboard to fold downward; the lower long edge folding plate 32 is arranged below the folding plate avoiding hole, and the lower long edge folding plate 32 is connected with a second driving mechanism, so as to control the lower long edge folding plate 32 to move upward by the second driving mechanism and make the to-be-folded paperboard complete lower folding, and after the lower long edge folding plate 32 passes through the folding plate avoiding hole, an upward force is given to the lower end of the to-be-folded paperboard, so as to drive the lower end of the to-be-folded paperboard to fold upward; the right side short edge folding 45 and the left side short edge folding 46 are respectively arranged on both sides inside the forming bin 44, so as to complete the short edge folding of the two short edges of the to-be-folded paperboard by the right side short edge folding 45 and the left side short edge folding 46, and then complete the packaging and folding of the entire to-be-folded paperboard.
[0030] The utility model make use of the thrust of product, push the to-be-folded paperboard into the forming bin 44 from product inlet, and make the to-be-folded paperboard complete three-face folding by the limiting of forming bottom plate 31 and front guide plate 37, then complete the long edge folding of the upper and lower long edges of to-be-folded paperboard by upper long edge folding plate 33 and lower long edge folding plate 32, finally complete the short edge folding of the two short edges of to-be-folded paperboard by right side short edge folding 45 and left side short edge folding 46, can complete the packaging and folding of the entire to-be-folded paperboard, concentrate the entire folding mechanism together, complete the more complex folding work than prior art, and also guarantee work efficiency.
[0031] As a preferred embodiment in the embodiment, it needs to be further explained that the front guide plate 37 is provided with two paper blocking plates 40, so as to limit the two sides of the to-be-folded paperboard by the two paper blocking plates 40, and then make the to-be-folded paperboard more stably placed on the strip-shaped box folding mechanism.
[0032] As a preferred embodiment in the present embodiment, it needs to be further explained that the first driving mechanism comprises the upper folding cross beam 34, the sliding guide column 35 and the upper folding driving assembly driving the sliding guide column 35 to move up and down, the upper folding cross beam 34 is connected with the upper long side folding plate 33, both ends of the upper folding cross beam 34 are connected with the sliding guide column 35, both of the sliding guide columns 35 vertically penetrate the shaped bottom plate 31, thereby ensuring that the upper long side folding plate 33 moves vertically up and down, and ensuring that the upper long side folding plate 33 can accurately fold the long side of the paperboard to be folded in the process of moving down.
[0033] As a preferred embodiment in the present embodiment, it needs to be further explained that both of the sliding guide columns 35 are slidably connected with the shaped bottom plate 31 through the linear bearing 36, the linear bearing 36 is installed on the shaped bottom plate 31, thereby making the sliding of the linear bearing 36 more smooth and reducing the friction.
[0034] As a preferred embodiment in the present embodiment, it needs to be further explained that the first driving mechanism further comprises the guide column connecting beam 47 and the upper folding hinge 39, the guide column connecting beam 47 is arranged below the shaped bottom plate 31, both ends of the guide column connecting beam 47 are connected with the two sliding guide columns 35 respectively, the upper folding hinge 39 is installed on the guide column connecting beam 47, the upper folding hinge 39 is connected with the upper folding driving assembly, so as to control the upper folding hinge 39 to move up and down through the upper folding driving assembly, the upper folding driving assembly can be a telescopic rod or a linkage mechanism controlled by a motor, etc., without specific limitation. The upper folding driving assembly drives the upper folding hinge 39 to move up and down, the upper folding hinge 39 drives the sliding guide column 35 to move up and down through the guide column connecting beam 47, and the sliding guide column 35 drives the upper long side folding plate 33 to move up and down through the upper folding cross beam 34.
[0035] As a preferred embodiment in the present embodiment, it needs to be further explained that the second driving mechanism comprises the lower edge vertical sliding rail seat 41, the vertical sliding rail 42, the lower folding support 43, the lower edge seat 48 and the lower folding driving assembly driving the lower edge seat 48 to move up and down, the lower edge vertical sliding rail seat 41 is connected with the lower long side folding plate 32 and the lower edge seat 48, the vertical sliding rail 42 is installed on the lower folding support 43 along the vertical direction, and the lower edge vertical sliding rail seat 41 is slidably connected on the vertical sliding rail 42. In actual operation, the lower folding driving assembly controls the lower edge seat 48 to slide up and down, the lower edge seat 48 drives the lower long side folding plate 32 to slide up and down through the lower edge vertical sliding rail seat 41, and the lower folding driving assembly can be a telescopic rod or a linkage mechanism controlled by a motor, etc., without specific limitation. It needs to be additionally explained here that in actual operation, the lower folding driving assembly can be combined with the upper folding driving assembly to form a total driving assembly, thereby further reducing the cost.
[0036] As a preferred embodiment in the present embodiment, it needs to be further explained that the lower folding support 43 is fixedly connected with the forming bottom plate 31 to ensure the stability of the lower folding support 43, of course, the lower folding support 43 can also be fixedly connected with other objects as long as the stability of the lower folding support 43 can be ensured.
[0037] As a preferred embodiment in the present embodiment, it needs to be further explained that the right side short edge folding 45 and the left side short edge folding 46 both include a fixed seat 1, a linear guide rail 2, a folder 3, a front fixed corner folder 4, a front fixed corner folder seat 5, a mounting seat 6 and a cylinder 7, the linear guide rail 2, the front fixed corner folder seat 5 and the cylinder 7 are all mounted on the fixed seat 1, the mounting seat 6 is slidingly connected on the linear guide rail 2, the folder 3 is connected on the mounting seat 6, the telescopic rod of the cylinder 7 is connected with the mounting seat 6 to drive the mounting seat 6 to slide on the linear guide rail 2 through the cylinder 7 and then control the folder 3 to move; the folder 3 is provided with a folding lug close to the outside of one side of the middle part of the forming bin 44, the side of the folding lug facing the product inlet is an inclined surface to facilitate the to-be-folded paperboard to slide between the two folding lugs to limit the short edge of the to-be-folded paperboard to fold backward; the other side of the folding lug away from the product inlet is an edge pressing plane to slide to the outlet direction of the forming bin 44 through the sliding of the folder 3 to further drive the short edge of the to-be-folded paperboard to fold backward; the front fixed corner folder seat 5 is located on the side of the folder 3 away from the product inlet, the front fixed corner folder 4 is mounted on the side of the front fixed corner folder seat 5 close to the middle part of the forming bin 44 to limit the short edge of the to-be-folded paperboard after folding backward. In practice, when the to-be-folded paperboard enters the forming bin 44, the short edge of the to-be-folded paperboard contacts the folder 3 to be folded by the limitation of the folder 3, and then is bound between the two front fixed corner folders 4, then the cylinder 7 can control the folder 3 to retract, the folding lug on the folder 3 can further press the short edge to realize the further folding of the short edge of the to-be-folded paperboard.
[0038] As a preferred embodiment in the present embodiment, it needs to be further explained that the paperboard support 38 includes a vertical extension plate and a support plate, the upper end of the vertical extension plate is fixedly connected with the forming bottom plate 31, the lower end of the vertical extension plate is fixedly connected with one end of the support plate, the other end of the support plate extends away from the forming bottom plate 31 and is arranged at an acute angle with the support plate, which is simple in structure and can stably support the to-be-folded paperboard.
[0039] Finally, it should be noted that the above only describes the preferred embodiments of the present application and is not intended to limit the protection scope of the present application. 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. A carton folding mechanism characterized by, The application relates to a paperboard folding machine, which comprises a shaped bottom plate (31), a lower long-side folding plate (32), an upper long-side folding plate (33), a front guide plate (37), a paperboard support (38), a right-side short-side folding plate (45), a left-side short-side folding plate (46) and a rear guide plate (49), a folding-plate-avoiding hole is formed in the middle of the shaped bottom plate (31), a front guide plate (37) is arranged above one side of the shaped bottom plate (31) of the folding-plate-avoiding hole, and the front guide plate (37) and the shaped bottom plate (31) cooperatively form a product inlet; a rear guide plate (49) is arranged above the other side of the shaped bottom plate (31) of the folding-plate-avoiding hole, and the rear guide plate (49) and the shaped bottom plate (31) cooperatively form a shaping chamber (44). The lower end of one side of the shaped bottom plate (31) is provided with the paperboard support (38), the paperboard support (38) is used for placing the paperboard to be folded, and when the paperboard to be folded is placed on the paperboard support (38), the middle of the paperboard to be folded is aligned with the product inlet, so that the product pushes the middle of the paperboard to be folded through the product inlet to enter the shaping chamber (44). The upper long-side folding plate (33) is arranged above the folding-plate-avoiding hole between the front guide plate (37) and the rear guide plate (49), and the upper long-side folding plate (33) is connected with a first driving mechanism, so as to control the downward movement of the upper long-side folding plate (33) through the first driving mechanism and make the paperboard to be folded complete upper folding. The lower long-side folding plate (32) is arranged below the folding-plate-avoiding hole, and the lower long-side folding plate (32) is connected with a second driving mechanism, so as to control the upward movement of the lower long-side folding plate (32) through the second driving mechanism and make the paperboard to be folded complete lower folding. The right-side short-side folding plate (45) and the left-side short-side folding plate (46) are arranged on the two sides inside the shaping chamber (44) respectively, so as to complete short-side folding of the two short sides of the paperboard to be folded through the right-side short-side folding plate (45) and the left-side short-side folding plate (46).
2. A carton folding mechanism according to claim 1, wherein, Two paperboard blocking plates (40) are arranged on the front guide plate (37), so as to limit the two sides of the paperboard to be folded through the two paperboard blocking plates (40).
3. A carton folding mechanism according to claim 1 or 2, wherein, The first driving mechanism comprises an upper folding cross beam (34), sliding guide columns (35) and an upper folding driving assembly for driving the sliding guide columns (35) to move up and down, the upper folding cross beam (34) is connected with the upper long-side folding plate (33), the two ends of the upper folding cross beam (34) are both connected with the sliding guide columns (35), and the two sliding guide columns (35) both vertically penetrate the shaped bottom plate (31).
4. A carton folding mechanism according to claim 3, wherein, The two sliding guide columns (35) are both slidably connected with the shaped bottom plate (31) through linear bearings (36), and the linear bearings (36) are arranged on the shaped bottom plate (31).
5. A carton folding mechanism according to claim 3 wherein, The first driving mechanism further comprises a guide column connecting beam (47) and an upper folding hinge (39), the guide column connecting beam (47) is arranged below the forming bottom plate (31), two ends of the guide column connecting beam (47) are connected with two sliding guide columns (35) respectively, and the upper folding hinge (39) is installed on the guide column connecting beam (47) and connected with the upper folding driving assembly, so as to control the upper folding hinge (39) to move up and down through the upper folding driving assembly.
6. A carton folding mechanism according to claim 1 or 2, wherein, The second driving mechanism comprises a lower blade edge vertical sliding rail seat (41), a vertical sliding rail (42), a lower folding support (43), a lower blade edge seat (48) and a lower folding driving assembly for driving the lower blade edge seat (48) to move up and down, the lower blade edge vertical sliding rail seat (41) is connected with the lower long edge folding plate (32) and the lower blade edge seat (48), the vertical sliding rail (42) is installed on the lower folding support (43) in the vertical direction, and the lower blade edge vertical sliding rail seat (41) is slidingly connected on the vertical sliding rail (42).
7. A carton folding mechanism according to claim 6, wherein The lower folding support (43) is fixedly connected with the forming bottom plate (31).
8. A carton folding mechanism according to claim 1 or 2, wherein, The right side short edge folding (45) and the left side short edge folding (46) each comprise a fixed seat (1), a linear guide rail (2), a folder (3), a front fixed folding corner device (4), a front fixed folding corner device seat (5), a mounting seat (6) and a cylinder (7), the linear guide rail (2), the front fixed folding corner device seat (5) and the cylinder (7) are all installed on the fixed seat (1), the mounting seat (6) is slidingly connected on the linear guide rail (2), the folder (3) is connected on the mounting seat (6), and the telescopic rod of the cylinder (7) is connected with the mounting seat (6), so as to drive the mounting seat (6) to slide on the linear guide rail (2) through the cylinder (7); the folder (3) is provided with a folding lug close to the outside of one side of the middle part of the forming bin (44), one side of the folding lug facing the product inlet is an inclined surface for facilitating the to-be-folded paperboard to slide between the two folding lugs, so as to limit the short edge of the to-be-folded paperboard through the folding lug and make it fold backward; the other side of the folding lug away from the product inlet is a pressing edge plane, so as to drive the pressing edge plane to slide to the outlet direction of the forming bin (44) through the sliding of the folder (3), and further drive the short edge of the to-be-folded paperboard to fold backward; the front fixed folding corner device seat (5) is located on the side of the folder (3) away from the product inlet, and the front fixed folding corner device (4) is installed on one side of the front fixed folding corner device seat (5) close to the middle part of the forming bin (44), so as to limit the short edge of the to-be-folded paperboard after folding backward through the two front fixed folding corner devices (4).
9. A carton folding mechanism according to claim 1 or 2, wherein, The paperboard support (38) comprises a vertical extension plate and a support plate, the upper end of the vertical extension plate is fixedly connected with the forming bottom plate (31), the lower end of the vertical extension plate is fixedly connected with one end of the support plate, and the other end of the support plate extends away from the forming bottom plate (31) and is arranged at an acute angle with the support plate.