Roller mechanism for extrusion forming of profile radiator and adjusting method of roller mechanism

Abstract

The invention discloses a roller mechanism for extrusion forming of a profile radiator and an adjusting method of the roller mechanism, the roller mechanism comprises two groups of symmetrically arranged compression roller assemblies, and each compression roller assembly comprises a roller seat and a roller rotationally arranged in the roller seat. The first adjusting assembly and the second adjusting assembly are arranged, the two roller seats and the rollers are driven to be combined or unfolded by rotating the adjusting screw rod of the first adjusting assembly, the moving distance of the rollers can be accurately controlled, the rollers are adjusted to be at the needed distance, and the adjustment efficiency is improved. The problems that according to an existing adjusting mode, the moving distance of the rollers is difficult to accurately control, and errors are prone to occurring are solved, the profile radiator penetrates through the position between the two rollers to be subjected to extrusion forming, a strip-shaped appearance of a specific size is obtained, the heights of the roller seat and the rollers can be finely adjusted by rotating an adjusting rod of the second adjusting assembly, and the production efficiency is improved. And the height of the profile radiator is matched.

Description

Technical Field

[0001] The invention relates to the technical field of extrusion rollers, in particular to a roller mechanism for extrusion molding of a profile radiator and an adjustment method thereof. Background Art

[0002] Profile radiator is a strip-shaped heat-conducting structure with aluminum profile as the main body, also known as heat dissipation aluminum bar and heat dissipation aluminum flat bar. Profile radiator is mainly used to quickly conduct the heat generated by the heating object to maintain the normal working temperature of the heating object and prevent damage due to overheating. Due to its superior performance, it is widely used in: machinery, automobiles, wind power generation, construction machinery, air compressors, railway locomotives, household appliances and other industries. When producing and processing profile radiators, it is necessary to use a roller mechanism to extrude them into a strip shape of a specific size before proceeding to the next step of processing.

[0003] The existing roller mechanism generally installs two rollers in an outer frame through bolts. The outer frame is provided with slide slots on the upper and lower parts and the bolts are inserted into the slide slots. The rollers are pushed by loosening and tightening the bolts to adjust the spacing. This adjustment method is difficult to accurately control the moving distance of the rollers. When loosening and tightening the bolts, the rollers may be offset and prone to errors, and the height of the rollers cannot be adjusted. Therefore, the present invention proposes a roller mechanism for extrusion molding of profile radiators and an adjustment method thereof to solve the above problems. Summary of the invention

[0004] The object of the present invention is to provide a roller mechanism for extrusion molding of a profile radiator and an adjustment method thereof, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a roller mechanism for extrusion molding of a profile radiator, comprising a roller assembly, two groups of which are symmetrically arranged, wherein the roller assembly comprises a roller seat and a roller rotatably arranged in the roller seat; The first adjustment assembly includes a support plate, a slide rail disposed on the top of the support plate, an adjustment clamping plate disposed at one end of the support plate, and an adjustment screw inserted in the adjustment clamping plate; The two roller seats are both slidably arranged on the slide rail of the support plate, and the first adjusting screw is threadedly connected with the roller seats; The second adjustment assembly includes a base plate, an adjustment screw rotatably arranged in the middle of the base plate, a threaded sleeve arranged at the bottom of the support plate, and a plurality of guide members arranged around the adjustment screw; One end of the adjusting screw rod is threadedly connected to the threaded sleeve, one end of the guide member is connected to the support plate, and the other end of the guide member is connected to the bottom plate.

[0006] As a preferred solution of the present invention, the roller seat comprises an outer frame, a pad installed at the bottom of the outer frame and sliders installed at both sides of the bottom of the pad, and the roller is located inside the outer frame; The slide rails are provided with two rails located at both sides of the top of the support plate. The slide rails correspond to the positions of the sliders of the roller seat, and the roller seat is slidably arranged on the slide rails through the sliders.

[0007] As a preferred solution of the present invention, wherein: a positioning shaft is arranged along the middle of the roller through the outer frame, bearings are arranged at the upper and lower ends of the roller, the roller and the bearings are both sleeved on the positioning shaft and located in the outer frame, and the bottom end of the positioning shaft is connected to the outer frame.

[0008] As a preferred solution of the present invention, the adjusting screw is provided with two sections of threads in opposite directions, a guide block is further provided at the bottom of the pad of the roller seat, and the guide block is located between the two sliders of the roller seat, and threaded holes matching the two sections of threads of the adjusting screw are respectively provided in the middle of the guide blocks of the two roller seats, the adjusting screw passes through the threaded holes of the two guide blocks, and the two sections of threads of the adjusting screw are respectively threadedly connected with the guide blocks of the two roller seats.

[0009] As a preferred solution of the present invention, the adjusting splint is a square plate-like structure, a circular hole matching the adjusting screw is arranged in the middle of the adjusting splint, a notch is straightly opened along the top of the circular hole of the adjusting splint to form a left splint and a right splint, the adjusting screw is inserted into the circular hole of the adjusting splint, a tension bolt is inserted into the adjusting splint above the circular hole, the tension bolt passes through the right splint and is threadedly connected to the left splint, and a turning handle is arranged on one side of the adjusting screw of the adjusting splint.

[0010] As a preferred solution of the present invention, a threaded groove matching with the adjusting screw is provided in the middle of the threaded sleeve of the support plate, and the top end of the adjusting screw is screwed into the threaded groove of the threaded sleeve and threadedly connected thereto.

[0011] As a preferred solution of the present invention, wherein: a driven bevel gear is arranged on the adjusting screw rod, a through hole is arranged in the middle of the bottom plate, the bottom end of the adjusting screw rod passes through the through hole of the bottom plate and is connected with a baffle plate, the driven bevel gear is close to the top of the bottom plate, and the baffle plate is close to the top of the bottom plate; The bottom plate is also provided with a support on one side of the adjusting screw rod, an adjusting rod is inserted on the support, one end of the adjusting rod is connected with a driving bevel gear, and the driving bevel gear of the adjusting rod is meshed with the driven bevel gear of the adjusting screw rod.

[0012] As a preferred solution of the present invention, wherein: the number of the guide members is at least 3, the guide members include a guide rod and a guide sleeve, the guide sleeve is installed on the base plate, the bottom end of the guide rod is inserted into the guide sleeve, and the top end of the guide rod is connected to the support plate.

[0013] A method for adjusting a roller mechanism for extrusion molding of a profile radiator, comprising roller spacing adjustment and roller height adjustment; The roller spacing adjustment comprises the following steps: S11. Loosen the tension bolt so that the adjusting clamp no longer clamps the adjusting screw; S12, rotating the adjusting screw so that the two guide blocks on the adjusting screw move along the axial direction of the adjusting screw and move closer to or farther away from each other; S13, the guide block drives the pad, the outer frame and the roller to move synchronously, and the sliders on both sides of the pad slide linearly along the slide rail, thereby adjusting the distance between the two rollers; S14. After the roller spacing adjustment is completed, tighten the tension bolt to restore the clamping state of the adjusting clamp plate to the adjusting screw; The roller height adjustment comprises the following steps: S21, rotating the adjusting rod, so that the adjusting rod drives the driving bevel gear to rotate, and the driving bevel gear drives the driven bevel gear and the adjusting screw to rotate; S22. When the adjusting screw rotates, the threaded sleeve at the top of the adjusting screw moves upward or downward along the adjusting screw, and the support plate and the roller above the support plate are driven to move synchronously through the threaded sleeve. The guide rod at the bottom of the support plate slides linearly along the guide sleeve, thereby adjusting the height of the two rollers.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention is provided with a first adjusting component and a second adjusting component. By rotating the adjusting screw of the first adjusting component, the two roller seats and the roller wheels are driven to merge or open, the moving distance of the roller wheels can be accurately controlled, and the roller wheels are adjusted to the required spacing, which solves the problem that the moving distance of the roller wheels is difficult to accurately control and errors are prone to occur in the existing adjustment method. The profile radiator is extruded through the two rollers to obtain a strip shape of a specific size. By rotating the adjustment rod of the second adjusting component, the height of the roller seat and the roller wheel can also be fine-tuned to match the height of the profile radiator. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a front cross-sectional structural schematic diagram of the present invention; Figure 3 For the present invention Figure 2 A schematic diagram of the enlarged structure at A in the middle; Figure 4 For the present invention Figure 2 Schematic diagram of the enlarged structure at point B in the middle.

[0016] In the figure: 1, pressure roller assembly; 11, roller seat; 111, outer frame; 112, pad; 113, slider; 114, guide block; 1141, threaded hole; 12, roller; 13, positioning shaft; 14, bearing; 2. First adjustment component; 21. Support plate; 22. Slide rail; 23. Adjustment clamp; 231. Tightening bolt; 24. Adjustment screw; 25. Turning handle; 3. Second adjustment component; 31. Base plate; 311. Through hole; 32. Adjusting screw; 33. Threaded sleeve; 331. Threaded groove; 34. Guide member; 341. Guide rod; 342. Guide sleeve; 35. Driven bevel gear; 36. Baffle; 37. Support; 38. Adjusting rod; 39. Active bevel gear. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] See also Figure 1-Figure 4 A roller mechanism for extrusion molding of a profile radiator comprises a roller assembly 1, two groups of which are symmetrically arranged, and the roller assembly 1 comprises a roller seat 11 and a roller 12 rotatably arranged in the roller seat 11; The first adjustment assembly 2 includes a support plate 21, a slide rail 22 disposed on the top of the support plate 21, an adjustment clamping plate 23 disposed at one end of the support plate 21, and an adjustment screw 24 inserted in the adjustment clamping plate 23; The two roller seats 11 are both slidably disposed on the slide rail 22 of the support plate 21, and the first adjusting screw 24 is threadedly connected to the roller seats 11; The second adjustment assembly 3 includes a bottom plate 31, an adjustment screw rod 32 rotatably disposed in the middle of the bottom plate 31, a threaded sleeve 33 disposed at the bottom of the support plate 21, and a plurality of guide members 34 disposed around the adjustment screw rod 32; One end of the adjusting screw rod 32 is threadedly connected to the threaded sleeve 33 , one end of the guide member 34 is connected to the support plate 21 , and the other end of the guide member 34 is connected to the bottom plate 31 .

[0019] In this embodiment, the roller seat 11 includes an outer frame 111, a pad 112 installed at the bottom of the outer frame 111, and sliders 113 installed at both sides of the bottom of the pad 112, and the roller 12 is located in the outer frame 111; Specifically, the outer frame 111 is a C-shaped structure, and the outer frame 111 and the pad 112 as well as the pad 112 and the slider 113 are connected by bolts arranged at four corners; Two slide rails 22 are provided on both sides of the top of the support plate 21. The slide rails 22 correspond to the positions of the sliders 113 of the roller seat 11. The roller seat 11 is slidably arranged on the slide rails 22 through the sliders 113. Specifically, the slide rail 22 is a strip structure, and a slide groove matching the slide rail 22 is provided at the bottom of the slider 113. The slider 113 is inserted into the slide rail 22 to prevent the slider 113 from being separated from the slide rail 22, and the slider 113 can slide linearly on the slide rail 22; The outer frame 111 is provided with a positioning shaft 13 running through the middle of the roller 12. The upper and lower ends of the roller 12 are provided with bearings 14. The roller 12 and the bearings 14 are both sleeved on the positioning shaft 13 and located in the outer frame 111. The bottom end of the positioning shaft 13 is connected to the outer frame 111. Specifically, the bearing 14 is embedded in the upper and lower ends of the roller 12, the outer ring of the bearing 14 is connected to the roller 12, the inner ring of the bearing 14 is sleeved on the positioning shaft 13, a cylindrical handle is provided at the top of the positioning shaft 13, and the bottom end of the positioning shaft 13 is threaded or pinned to the outer frame 111.

[0020] In this embodiment, the adjusting screw 24 is provided with two sections of threads in opposite directions, and a guide block 114 is further provided at the bottom of the pad 112 of the roller seat 11, and the guide block 114 is located between the two sliders 113 of the roller seat 11, and threaded holes 1141 matching the two sections of threads of the adjusting screw 24 are respectively provided in the middle of the guide blocks 114 of the two roller seats 11, and the adjusting screw 24 passes through the threaded holes 1141 of the two guide blocks 114, and the two sections of threads of the adjusting screw 24 are respectively threadedly connected with the guide blocks 114 of the two roller seats 11; Specifically, when the adjusting screw 24 rotates, the guide block 114 on the adjusting screw 24 moves axially along the adjusting screw 24 , and the two guide blocks 114 move closer to or farther from each other, and the guide blocks 114 drive the roller seat 11 to move as a whole, thereby adjusting the distance between the two rollers 12 .

[0021] In this embodiment, the adjusting clamp plate 23 is a square plate-shaped structure, a circular hole matching with the adjusting screw 24 is arranged in the middle of the adjusting clamp plate 23, a notch is opened in the adjusting clamp plate 23 along the top straight line of the circular hole to form a left clamp plate and a right clamp plate, the adjusting screw 24 is inserted into the circular hole of the adjusting clamp plate 23, a tension bolt 231 is inserted into the adjusting clamp plate 23 above the circular hole, the tension bolt 231 passes through the right clamp plate and is threadedly connected with the left clamp plate, and a rotating handle 25 is arranged on one side of the adjusting screw 24 located on the adjusting clamp plate 23; Specifically, when it is necessary to adjust the spacing of the rollers 12, the tensioning bolt 231 is loosened so that the adjusting clamp 23 no longer clamps the adjusting screw 24, thereby rotating the adjusting screw 24 to adjust the spacing. When it is not necessary to adjust the spacing of the rollers 12, the tensioning bolt 231 is tightened so that the adjusting clamp 23 maintains the clamping state of the adjusting screw 24 to prevent the adjusting screw 24 from rotating without human power.

[0022] In this embodiment, a thread groove 331 matching with the adjusting screw rod 32 is provided in the middle of the threaded sleeve 33 of the support plate 21, and the top end of the adjusting screw rod 32 is screwed into the thread groove 331 of the threaded sleeve 33 and is threadedly connected thereto; A driven bevel gear 35 is provided on the adjusting screw rod 32, a through hole 311 is provided in the middle of the bottom plate 31, the bottom end of the adjusting screw rod 32 passes through the through hole 311 of the bottom plate 31 and is connected with a baffle 36, the driven bevel gear 35 is close to the top of the bottom plate 31, and the baffle 36 is close to the top of the bottom plate 31; Specifically, the bottom plate 31 is provided with a groove at the baffle 36, and the baffle 36 is placed in the groove of the bottom plate 31. The through hole 311 of the bottom plate 31 and the baffle 36 are both circular, and the diameter of the baffle 36 is larger than the inner diameter of the through hole 311. The baffle 36 and the adjusting screw rod 32 are threadedly connected. The bottom plate 31 is also provided with a support 37 on one side of the adjusting screw rod 32 , and an adjusting rod 38 is inserted on the support 37 . One end of the adjusting rod 38 is connected to a driving bevel gear 39 , and the driving bevel gear 39 of the adjusting rod 38 is meshed with the driven bevel gear 35 of the adjusting screw rod 32 .

[0023] In this embodiment, the number of guide members 34 is at least 3. In specific implementation, the number of guide members 34 is set to 3 or 4. When the number of guide members 34 is set to 3, two guide members 34 are set on one side of the base plate 31, and one guide member 34 is set on the other side. The adjustment rod 38 and the support 37 are located on the side with two guide members 34. When the number of guide members 34 is set to 4, two guide members 34 are respectively set on both sides of the base plate 31. The guide members 34 include a guide rod 341 and a guide sleeve 342. The guide sleeve 342 is installed on the base plate 31, and the bottom end of the guide rod 341 is inserted into the guide sleeve 342. The top end of the guide rod 341 is connected to the support plate 21. Specifically, the guide sleeve 342 is fixed to the base plate 31 by bolts, and the top end of the guide rod 341 is inserted into the support plate 21 and is threadedly connected or pinned to it.

[0024] The adjustment method of the roller mechanism for extrusion molding of the profile radiator of the present invention includes adjusting the spacing of the rollers 12 and adjusting the height of the rollers 12; The roller 12 spacing adjustment includes the following steps: S11, loosen the tension bolt 231 so that the adjusting clamping plate 23 no longer clamps the adjusting screw 24; S12, rotating the adjusting screw 24, so that the two guide blocks 114 on the adjusting screw 24 move along the axial direction of the adjusting screw 24 and move closer to or farther from each other; S13, the guide block 114 drives the pad 112, the outer frame 111 and the roller 12 to move synchronously, and the sliders 113 on both sides of the pad 112 slide linearly along the slide rail 22, so as to adjust the distance between the two rollers 12; S14, after the roller 12 spacing is adjusted, the tension bolt 231 is tightened to restore the clamping state of the adjusting clamp plate 23 to the adjusting screw 24; The height adjustment of the roller 12 includes the following steps: S21, rotating the adjusting rod 38, so that the adjusting rod 38 drives the active bevel gear 39 to rotate, and the active bevel gear 39 drives the driven bevel gear 35 and the adjusting screw 32 to rotate; S22. When the adjusting screw rod 32 rotates, the threaded sleeve 33 at the top of the adjusting screw rod 32 moves upward or downward along the adjusting screw rod 32, and the threaded sleeve 33 drives the support plate 21 and the roller 12 above the support plate 21 to move synchronously, and the guide rod 341 at the bottom of the support plate 21 slides linearly along the guide sleeve 342, thereby adjusting the height of the two rollers 12.

[0025] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A roller mechanism for extrusion molding of a profile radiator, characterized in that: include, A pressure roller assembly (1) is symmetrically arranged in two groups, the pressure roller assembly (1) comprising a roller seat (11) and a roller wheel (12) rotatably arranged in the roller seat (11); A first adjustment component (2), comprising a support plate (21), a slide rail (22) arranged on the top of the support plate (21), an adjustment clamping plate (23) arranged at one end of the support plate (21), and an adjustment screw (24) inserted into the adjustment clamping plate (23); The two roller seats (11) are both slidably arranged on the slide rail (22) of the support plate (21), and the first adjusting screw (24) is threadedly connected to the roller seats (11); A second adjustment assembly (3), comprising a base plate (31), an adjustment screw (32) rotatably disposed in the middle of the base plate (31), a threaded sleeve (33) disposed at the bottom of the support plate (21), and a plurality of guide members (34) disposed around the adjustment screw (32); One end of the adjusting screw rod (32) is threadedly connected to the threaded sleeve (33), one end of the guide member (34) is connected to the support plate (21), and the other end of the guide member (34) is connected to the bottom plate (31).

2. The roller mechanism for extrusion molding of profile radiator according to claim 1, characterized in that: The roller seat (11) comprises an outer frame (111), a pad (112) mounted on the bottom of the outer frame (111), and sliders (113) mounted on both sides of the bottom of the pad (112), and the roller (12) is located inside the outer frame (111); The slide rails (22) are provided with two ends located on both sides of the top of the support plate (21); the slide rails (22) correspond to the positions of the sliders (113) of the roller seat (11); the roller seat (11) is slidably arranged on the slide rails (22) via the sliders (113).

3. The roller mechanism for extrusion molding of profile radiator according to claim 2, characterized in that: The outer frame (111) is provided with a positioning shaft (13) passing through the middle of the roller (12); bearings (14) are provided at both upper and lower ends of the roller (12); the roller (12) and the bearing (14) are both sleeved on the positioning shaft (13) and located inside the outer frame (111); and the bottom end of the positioning shaft (13) is connected to the outer frame (111).

4. The roller mechanism for extrusion molding of profile radiator according to claim 3, characterized in that: The adjusting screw (24) is provided with two sections of threads in opposite directions. A guide block (114) is also provided at the bottom of the pad (112) of the roller seat (11), and the guide block (114) is located between the two sliders (113) of the roller seat (11). The middle of the guide blocks (114) of the two roller seats (11) are respectively provided with threaded holes (1141) that match the two sections of threads of the adjusting screw (24). The adjusting screw (24) passes through the threaded holes (1141) of the two guide blocks (114), and the two sections of threads of the adjusting screw (24) are respectively threadedly connected to the guide blocks (114) of the two roller seats (11).

5. The roller mechanism for extrusion molding of profile radiator according to claim 4, characterized in that: The adjusting clamp (23) is a square plate-shaped structure. A circular hole matching the adjusting screw (24) is provided in the middle of the adjusting clamp (23). A notch is provided in the adjusting clamp (23) along the top straight line of the circular hole to form a left clamp and a right clamp. The adjusting screw (24) is inserted into the circular hole of the adjusting clamp (23). A tension bolt (231) is inserted into the adjusting clamp (23) above the circular hole. The tension bolt (231) passes through the right clamp and is threadedly connected to the left clamp. A rotating handle (25) is provided on one side of the adjusting screw (24) located on the adjusting clamp (23).

6. The roller mechanism for extrusion molding of profile radiator according to claim 1 or 5, characterized in that: A threaded groove (331) matching with the adjusting screw rod (32) is provided in the middle of the threaded sleeve (33) of the support plate (21), and the top end of the adjusting screw rod (32) is screwed into the threaded groove (331) of the threaded sleeve (33) to be threadedly connected thereto.

7. The roller mechanism for extrusion molding of profile radiator according to claim 6, characterized in that: A driven bevel gear (35) is provided on the adjusting screw rod (32), a through hole (311) is provided in the middle of the bottom plate (31), the bottom end of the adjusting screw rod (32) passes through the through hole (311) of the bottom plate (31) and is connected to a baffle (36), the driven bevel gear (35) is close to the top of the bottom plate (31), and the baffle (36) is close to the top of the bottom plate (31); The bottom plate (31) is further provided with a support (37) on one side of the adjusting screw rod (32); an adjusting rod (38) is inserted into the support (37); one end of the adjusting rod (38) is connected to a driving bevel gear (39); the driving bevel gear (39) of the adjusting rod (38) is meshed with the driven bevel gear (35) of the adjusting screw rod (32).

8. The roller mechanism for extrusion molding of profile radiator according to claim 7, characterized in that: The number of the guide members (34) is at least three. The guide members (34) comprise a guide rod (341) and a guide sleeve (342). The guide sleeve (342) is mounted on the bottom plate (31). The bottom end of the guide rod (341) is inserted into the guide sleeve (342). The top end of the guide rod (341) is connected to the support plate (21).

9. The method for adjusting the roller mechanism for extrusion molding of a profile radiator according to any one of claims 1 to 8, characterized in that: It includes roller (12) spacing adjustment and roller (12) height adjustment; The roller (12) spacing adjustment comprises the following steps: S11, loosen the tension bolt (231) so that the adjusting clamping plate (23) no longer clamps the adjusting screw (24); S12, rotating the adjusting screw (24) so ​​that the two guide blocks (114) on the adjusting screw (24) move axially along the adjusting screw (24) and move closer to or farther from each other; S13, driving the pad (112), the outer frame (111) and the roller (12) to move synchronously through the guide block (114), and the sliders (113) on both sides of the pad (112) slide linearly along the slide rails (22), thereby adjusting the distance between the two rollers (12); S14, after the roller (12) spacing adjustment is completed, the tension bolt (231) is tightened to restore the clamping state of the adjustment clamping plate (23) to the adjustment screw (24); The height adjustment of the roller (12) comprises the following steps: S21, rotating the adjusting rod (38), so that the adjusting rod (38) drives the driving bevel gear (39) to rotate, and the driving bevel gear (39) drives the driven bevel gear (35) and the adjusting screw (32) to rotate; S22. When the adjusting screw (32) rotates, the threaded sleeve (33) at the top of the adjusting screw (32) moves upward or downward along the adjusting screw (32), and the supporting plate (21) and the roller (12) above the supporting plate (21) are driven to move synchronously through the threaded sleeve (33), and the guide rod (341) at the bottom of the supporting plate (21) slides linearly along the guide sleeve (342), thereby adjusting the height of the two rollers (12).

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