Adjustable bone sawing machine

Abstract

The utility model discloses an adjustable bone sawing machine which comprises a main body machine frame, a cutting assembly is arranged on the main body machine frame, and the cutting assembly comprises a driving motor and a saw blade. A pushing assembly is arranged on the side face of the main body rack and comprises a supporting frame, and a pushing plate is installed on the supporting frame; an adjusting assembly is further arranged on the edge of the main body rack and comprises a mounting bracket, a limiting adjusting plate, a fixed screw rod and a rotating screw rod; a fixing screw rod is arranged on the mounting bracket, a limiting adjusting plate is arranged between the fixing screw rod and the main body rack, an adjusting seat is arranged on the limiting adjusting plate, and a compression spring is arranged between the adjusting seat and the limiting adjusting plate; a rotating screw rod is arranged on the adjusting seat, and the rotating screw rod is meshed with the fixed screw rod; and a side baffle is fixedly mounted on the limiting adjusting plate. According to the utility model, the limiting adjusting plate is in sliding connection with the fixed screw rod, so that the thickness of a slice can be coarsely adjusted, and accurate fine adjustment can be realized by rotating the screw rod; and the slice thickness adjusting range is wider, and the adjusting speed is higher.

Description

Technical Field

[0001] This utility model belongs to the field of bone sawing machine technology, specifically relating to an adjustable bone sawing machine. Background Technology

[0002] Meat retains a certain firmness after freezing, making it easier to cut and separate. A bone saw can facilitate this process. Existing patent CN222532607U discloses a bone saw equipped with an easy-to-clean track, including a machine body and an operating table. A placement box is fixedly connected to one side of the operating table, and a cleaning mechanism is located above the operating table. This bone saw with an easy-to-clean track adjusts the cutting thickness by turning a threaded rod connected to a baffle via a bearing. During adjustment, the baffle and a fixing ring slide along the track. However, existing bone saws only allow adjustment of the cutting thickness via the threaded rod, requiring slow rotation each time. When a large range of meat thickness needs to be cut, multiple rotations of the threaded rod are required, making thickness adjustment laborious and inefficient. Therefore, an adjustable bone saw is needed to overcome these problems. Summary of the Invention

[0003] This invention addresses the problems existing in the prior art by designing an adjustable bone saw. This invention uses a limit adjustment plate that is slidably connected to a fixed screw to allow for coarse adjustment of the slice thickness. Then, the position of the limit adjustment plate can be precisely adjusted by rotating the screw. The slice thickness adjustment range is wider, the adjustment speed is faster, and the adjustment process is more labor-saving.

[0004] The objective of this invention is achieved through the following technical solution: An adjustable bone saw includes a main frame, on which a cutting assembly is mounted. The cutting assembly includes a drive motor and a saw blade. When the drive motor operates, it drives the saw blade to rotate relative to the main frame. A pushing assembly is provided on the side of the main frame, including a support frame with a push plate mounted on it. An adjustment assembly is also provided on the edge of the main frame, including a mounting bracket, a limit adjustment plate, a fixing screw, and a rotating screw. The mounting bracket has a fixing screw, and a limit adjustment plate is slidably mounted between the fixing screw and the main frame. The limit adjustment plate has an adjustment seat rotatably connected to it, and a compression spring is provided between the adjustment seat and the limit adjustment plate. The adjustment seat has a rotating screw rotatably connected to it, and the rotating screw meshes with the fixing screw. A side baffle is fixedly mounted on the limit adjustment plate.

[0005] Preferably, the cutting assembly further includes a first knob, a lead screw and an adjusting slider, a driving disc and a driven disc; the main frame is provided with a mounting box, which has an oblong hole in which the adjusting slider is slidably mounted; the outer side of the mounting box is provided with a lead screw rotatably connected thereto, and the end of the lead screw is provided with the first knob; one end of the lead screw is mounted on the mounting box via a bearing, and the other end of the lead screw is mounted on the adjusting slider via a bearing; the adjusting slider is provided with a driven disc rotatably connected thereto, and the bottom of the main frame is provided with a driving disc rotatably connected thereto; a saw blade is sleeved between the driving disc and the driven disc, and a drive motor is fixedly mounted on the main frame, with the motor shaft of the drive motor connected to the driving disc.

[0006] Preferably, the width of the waist-shaped hole is adapted to the width of the adjusting slider, and the adjusting slider moves up and down along the waist-shaped hole when the first knob drives the lead screw to rotate; the main frame is provided with mounting holes for inserting the saw blade, and the saw teeth on the saw blade are set towards the adjusting component.

[0007] The side baffle position is pre-adjusted by adjusting the component, ensuring a fixed distance between the side baffle and the saw blade, thus maintaining a consistent slice thickness. The meat to be cut is placed on the push plate of the push component, and the drive motor is turned on. The drive motor rotates the active disc, which in turn drives the driven disc via the saw blade. The saw blade then rotates continuously relative to the main frame; the saw teeth on the blade are not shown in the accompanying diagram. The meat on the push plate is then pushed towards the saw blade to slice it. After prolonged use, the saw blade tension needs adjustment. Turning the first knob rotates the lead screw, allowing the adjustment slider to move up and down along the oblong hole, facilitating easy adjustment of the saw blade tension.

[0008] Preferably, the adjustment assembly further includes a second knob and a handle, and the mounting bracket is fixedly mounted on the main frame; a fixing screw is fixedly installed between the two extension arms of the mounting bracket, and a limit adjustment plate is slidably installed on the fixing screw, with the lower end face of the limit adjustment plate abutting against the upper end face of the main frame; the limit adjustment plate is provided with an adjustment seat rotatably connected thereto, and a handle is fixedly installed on the adjustment seat; the adjustment seat is provided with a rotating screw rotatably connected thereto, and a second knob is fixedly installed at the end of the rotating screw; a strip plate is fixedly installed on the adjustment seat, and a guide limit screw is provided on the adjustment plate, with a compression spring sleeved on the outer layer of the guide limit screw.

[0009] Preferably, a first pin is fixedly installed on the limiting adjustment plate, and the adjustment seat is rotatably installed on the first pin; a retaining spring is installed between the adjustment seat and the first pin, and the retaining spring is fitted against the side wall of the adjustment seat.

[0010] Preferably, the bottom of the fixed screw is provided with a first thread, and the rotating screw is provided with a second thread, the first thread and the second thread meshing with each other; the rotating screw is located below the fixed screw; when the rotating screw rotates relative to the fixed screw, the limiting adjustment plate moves along the axial direction of the fixed screw.

[0011] Preferably, the compression spring is sleeved on the guide limit screw; one end of the compression spring is fixedly installed on the limit adjustment plate, and the other end of the compression spring is fixedly installed on the strip plate; in the default state, the fixing screw and the rotating screw are engaged with each other, and the compression spring is in a compressed state; a side baffle is fixedly installed on the side of the limit adjustment plate, the bottom of the side baffle is fitted with the main frame, and the side wall of the side baffle is parallel to the push plate.

[0012] Preferably, the support frame is provided with a pair of guide protrusions, and the push plate is slidably mounted on the guide protrusions; the guide protrusions are provided with slots, and the bottom of the push plate is provided with a limiting strip; the limiting strip is disposed in the slot, and the outer contour of the limiting strip is adapted to the outer contour of the slot; both ends of the support frame are provided with buffers, and the push plate is disposed between the two buffers; the upper end surface of the push plate is flush with the upper end surface of the main frame.

[0013] Preferably, the main frame is further provided with a limiting component to restrict the movement of the limiting adjustment plate; the limiting component includes a first screw, a third knob and a limiting component body; the first screw is screwed to the main frame, one end of the first screw is fixedly installed with the third knob, and the other end of the first screw is fixedly installed with the limiting component body; the limiting component body is arranged facing the side baffle, and the limiting component body and the side baffle are arranged parallel to each other.

[0014] In the default state, the compression spring is compressed, so the rotating screw is positioned directly below the fixed screw, and the rotating and fixed screws are engaged. Turning the second knob causes the rotating screw to rotate relative to the fixed screw, thus moving the adjusting seat and limit adjustment plate along the axial direction of the fixed screw relative to the main frame. First, determine the desired meat cutting thickness and make a rough adjustment using the limit adjustment plate. Pushing the handle further compresses the compression spring, allowing the adjusting seat to rotate relative to the limit adjustment plate. This rotation causes the rotating screw to disengage from the fixed screw, allowing the operator to move the limit adjustment plate left and right in a wide range. After determining the approximate position of the limit adjustment plate, release the handle, causing the rotating screw to re-engage with the fixed screw. Then, rotate the rotating screw using the second knob to precisely adjust the position of the limit adjustment plate. The main frame often has scale lines on its edge (not shown in the accompanying diagram), which can be used to determine the position of the limit adjustment plate. A detachable retaining circlip is installed on the first pin. The retaining circlip is an existing standard part and is not shown in the accompanying drawings. The retaining circlip is used to axially position the adjusting seat and prevent the adjusting seat from moving relative to the first pin. After the position of the limiting adjusting plate is adjusted, the position of the limiting adjusting plate is fixed by the limiting assembly. The first screw is rotated by the third knob, so that the body of the limiting component is fitted against the side of the limiting adjusting plate.

[0015] Compared with the prior art, this utility model has the following advantages: 1. This utility model allows for rough adjustment of the side baffle position via the adjustment component, followed by precise adjustment of the side baffle position via the second knob driving the rotating screw; this facilitates adjustment of the slice thickness, making adjustment faster and less strenuous; 2. The limiting component restricts the position of the side baffle, preventing displacement of the side baffle during meat cutting, resulting in better synchronization; 3. The pushing component moves the meat relative to the cutting component, making the cutting process more strenuous and safer. Attached Figure Description

[0016] Figure 1 This is a perspective view of the present utility model;

[0017] Figure 2 This is a diagram of the internal structure of the present invention;

[0018] Figure 3 for Figure 1 A magnified view of a portion of position A in the middle;

[0019] Figure 4 To provide a 3D view of the components;

[0020] Figure 5 To adjust the exploded view of the components;

[0021] Markings in the diagram: 1. Main frame; 2. Cutting assembly; 21. Drive motor; 22. Saw blade; 23. First knob; 24. Lead screw; 25. Adjusting slider; 26. Driven disc; 27. Driven disc; 3. Pushing assembly; 31. Support frame; 32. Push plate; 33. Guide protrusion; 34. Slot; 35. Limiting strip; 36. Buffer; 4. Adjusting assembly; 41. Mounting bracket; 42. Limiting adjustment plate; 43. Fixed... 44. Fixed screw; 45. Rotating screw; 46. Strip plate; 47. Adjusting seat; 48. Compression spring; 49. Second knob; 40. Handle; 410. Guide limit screw; 411. First pin; 412. First thread; 413. Second thread; 5. Side baffle; 6. Mounting box; 61. Waist-shaped hole; 7. Mounting hole; 8. Limiting component; 81. First screw; 82. Third knob; 83. Limiting component body. Detailed Implementation

[0022] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings:

[0023] like Figures 1 to 5 As shown, this embodiment discloses an adjustable bone saw, including a main frame 1, a cutting assembly 2 on the main frame 1, the cutting assembly 2 including a drive motor 21 and a saw blade 22, the drive motor 21 driving the saw blade 22 to rotate relative to the main frame 1 when working; a pushing assembly 3 is provided on the side of the main frame 1, the pushing assembly 3 including a support frame 31, a push plate 32 mounted on the support frame 31; an adjustment assembly 4 is also provided on the edge of the main frame 1, the adjustment assembly 4 including a mounting bracket 41, a limit adjustment plate 42, etc. A fixed screw 43 and a rotating screw 44 are provided on the mounting bracket 41. A limit adjustment plate 42 is slidably installed between the fixed screw 43 and the main frame 1. An adjustment seat 46 is rotatably connected to the limit adjustment plate 42. A compression spring 47 is provided between the adjustment seat 46 and the limit adjustment plate 42. A rotating screw 44 is rotatably connected to the adjustment seat 46. The rotating screw 44 meshes with the fixed screw 43. A side baffle 5 is fixedly installed on the limit adjustment plate 42.

[0024] The cutting assembly 2 further includes a first knob 23, a lead screw 24, an adjusting slider 25, a driving disc 27, and a driven disc 26. The main frame 1 is provided with a mounting box 6, which has an oblong hole 61. The adjusting slider 25 is slidably mounted within the oblong hole 61. A lead screw 24 is rotatably connected to the outer side of the mounting box 6, and the first knob 23 is mounted at the end of the lead screw 24. One end of the lead screw 24 is mounted on the mounting box 6 via a bearing, and the other end is mounted on the adjusting slider 25 via a bearing. The driven disc 26 is rotatably connected to the adjusting slider 25, and a driving disc 27 is rotatably connected to the bottom of the main frame 1. A saw blade 22 is fitted between the driving disc 27 and the driven disc 26. A drive motor 21 is fixedly mounted on the main frame 1, and the motor shaft of the drive motor 21 is connected to the driving disc 27. The width of the waist-shaped hole 61 is adapted to the width of the adjusting slider 25. When the first knob 23 drives the lead screw 24 to rotate, the adjusting slider 25 moves up and down along the waist-shaped hole 61. The main frame 1 is provided with a mounting hole 7 for inserting the saw blade 22, and the saw teeth on the saw blade 22 are set towards the adjusting component 4.

[0025] The adjustment assembly 4 further includes a second knob 48 and a handle 49. The mounting bracket 41 is fixedly mounted on the main frame 1. A fixing screw 43 is fixedly mounted between the two extension arms of the mounting bracket 41. A limit adjustment plate 42 is slidably mounted on the fixing screw 43. The lower end face of the limit adjustment plate 42 is in contact with the upper end face of the main frame 1. An adjustment seat 46 is provided on the limit adjustment plate 42 and rotatably connected thereto. A handle 49 is fixedly mounted on the adjustment seat 46. A rotating screw 44 is provided on the adjustment seat 46 and rotatably connected thereto. A second knob 48 is fixedly mounted at the end of the rotating screw 44. A strip plate 45 is fixedly mounted on the adjustment seat 46. A guide limit screw 410 is provided on the adjustment plate. A compression spring 47 is sleeved on the outer layer of the guide limit screw 410. A first pin 411 is fixedly mounted on the limiting adjustment plate 42, and the adjusting seat 46 is rotatably mounted on the first pin 411. A retaining ring is installed between the adjusting seat 46 and the first pin 411, and the retaining ring is fitted against the side wall of the adjusting seat 46. The bottom of the fixing screw 43 is provided with a first thread 412, and the rotating screw 44 is provided with a second thread 413, and the first thread 412 and the second thread 413 mesh with each other. The rotating screw 44 is located below the fixing screw 43. When the rotating screw 44 rotates relative to the fixing screw 43, the limiting adjustment plate 42 moves along the axial direction of the fixing screw 43. The compression spring 47 is sleeved on the guide limit screw 410; one end of the compression spring 47 is fixedly installed on the limit adjustment plate 42, and the other end of the compression spring 47 is fixedly installed on the strip plate 45; in the default state, the fixing screw 43 and the rotating screw 44 are engaged with each other, and the compression spring 47 is in a compressed state; a side baffle 5 is fixedly installed on the side of the limit adjustment plate 42, the bottom of the side baffle 5 is fitted with the main frame 1, and the side wall of the side baffle 5 is parallel to the push plate 32. The compression spring 47 is sleeved on the guide limit screw 410; one end of the compression spring 47 is fixedly installed on the limit adjustment plate 42, and the other end of the compression spring 47 is fixedly installed on the strip plate 45; in the default state, the fixing screw 43 and the rotating screw 44 are engaged with each other, and the compression spring 47 is in a compressed state; a side baffle 5 is fixedly installed on the side of the limit adjustment plate 42, the bottom of the side baffle 5 is fitted with the main frame 1, and the side wall of the side baffle 5 is parallel to the push plate 32. The main frame 1 is also provided with a limiting component 8 to restrict the movement of the limiting adjustment plate 42; the limiting component 8 includes a first screw 81, a third knob 82 and a limiting component body 83; the first screw 81 is screwed to the main frame, one end of the first screw 81 is fixedly installed with the third knob 82, and the other end of the first screw 81 is fixedly installed with the limiting component body 83; the limiting component body 83 is set towards the side baffle 5, and the limiting component body 83 and the side baffle 5 are arranged parallel to each other.

[0026] The specific operation process of this embodiment is as follows: In the default state, the compression spring 47 is in a compressed state, so the rotating screw 44 is just below the fixed screw 43, and the rotating screw 44 and the fixed screw 43 are engaged with each other; rotating the second knob 48 causes the rotating screw 44 to rotate relative to the fixed screw 43, so that the adjusting seat 46 and the limit adjusting plate 42 will move relative to the main frame 1 along the axial direction of the fixed screw 43; the cutting thickness of the meat is determined in advance, and the position is first roughly adjusted by the limit adjusting plate 42; then push the handle 49 to further compress the compression spring 47, so that the adjusting seat 46... The adjusting seat 46 can rotate relative to the limiting adjustment plate 42. When the adjusting seat 46 rotates, it drives the rotating screw 44 to disengage from the fixing screw 43, and then the operator can push the limiting adjustment plate 42 left and right in a wide range. After determining the approximate position of the limiting adjustment plate 42, the handle 49 is released, so that the rotating screw 44 and the fixing screw 43 re-engage. Then, the second knob 48 drives the rotating screw 44 to rotate, so that the position of the limiting adjustment plate 42 can be precisely adjusted. There are often scale lines on the edge of the main frame 1. The scale lines are not shown in the attached drawings of the instruction manual. The position of the limiting adjustment plate 42 is determined by the scale lines. A detachable retaining ring is installed on the first pin 411. The retaining ring is an existing standard part and is not shown in the attached drawings of the instruction manual. The retaining ring is used to axially position the adjusting seat 46 to prevent the adjusting seat 46 from moving relative to the first pin 411. After adjusting the position of the limit adjustment plate 42, the position of the limit adjustment plate 42 is fixed by the limit component 8; the first screw 81 is rotated by the third knob 82, so that the limit component body 83 is fitted to the side of the limit adjustment plate 42.

[0027] The position of the side baffle 5 is pre-adjusted by adjusting component 4, so that the distance between the side baffle 5 and the saw blade 22 is kept fixed, and the slicing thickness of the meat is kept fixed. The meat to be cut is placed on the push plate 32 of the push component 3, and the drive motor 21 is turned on. The drive motor 21 drives the active plate 27 to rotate, and the active plate 27 drives the driven plate 26 to rotate through the saw blade 22. In this way, the saw blade 22 will rotate continuously relative to the main frame 1. The saw teeth on the saw blade 22 are not shown in the attached drawings of the instruction manual. Then, the meat on the push plate 32 is pushed toward the saw blade 22, thereby slicing and dividing the meat.

[0028] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. An adjustable bone saw, comprising a main frame (1) on which a cutting assembly (2) is arranged, characterized in that, The cutting assembly (2) comprises a driving motor (21) and a saw blade (22), the driving motor (21) drives the saw blade (22) to rotate relative to the main rack (1) when working; the side of the main rack (1) is provided with a pushing assembly (3), the pushing assembly (3) comprises a support frame (31), and a push plate (32) is installed on the support frame (31); the edge of the main rack (1) is also provided with an adjusting assembly (4), the adjusting assembly (4) comprises a mounting bracket (41), a limiting adjusting plate (42), a fixed screw rod (43) and a rotating screw rod (44); the mounting bracket (41) is provided with the fixed screw rod (43), the limiting adjusting plate (42) is slidably installed between the fixed screw rod (43) and the main rack (1), the limiting adjusting plate (42) is provided with an adjusting seat (46) rotatably connected thereto, and the adjusting seat (46) and the limiting adjusting plate (42) are provided with a compression spring (47); the adjusting seat (46) is provided with the rotating screw rod (44) rotatably connected thereto, and the rotating screw rod (44) and the fixed screw rod (43) are meshed with each other; and the limiting adjusting plate (42) is fixedly installed with a side baffle (5).

2. The adjustable bone saw as set forth in claim 1, wherein, The cutting assembly (2) further comprises a first knob (23), a lead screw (24) and an adjusting sliding block (25), a driving disc (27) and a driven disc (26); the main rack (1) is provided with a mounting box body (6), the mounting box body (6) is provided with a waist-shaped hole (61), and the adjusting sliding block (25) is slidably installed in the waist-shaped hole (61); the outer side of the mounting box body (6) is provided with the lead screw (24) rotatably connected thereto, and the tail end of the lead screw (24) is installed with the first knob (23); one end of the lead screw (24) is installed on the mounting box body (6) through a bearing, and the other end of the lead screw (24) is installed on the adjusting sliding block (25) through a bearing; the adjusting sliding block (25) is provided with the driven disc (26) rotatably connected thereto, and the bottom of the main rack (1) is provided with the driving disc (27) rotatably connected thereto; the saw blade (22) is sleeved and installed between the driving disc (27) and the driven disc (26), the main rack (1) is fixedly installed with the driving motor (21), and the motor shaft of the driving motor (21) is connected with the driving disc (27).

3. The adjustable osteotome of claim 2, wherein, The width of the waist-shaped hole (61) and the width of the adjusting sliding block (25) are matched with each other, the adjusting sliding block (25) moves up and down along the waist-shaped hole (61) when the first knob (23) drives the lead screw (24) to rotate; the main rack (1) is provided with a mounting hole (7) penetrating the saw blade (22), and the saw teeth on the saw blade (22) are arranged towards the adjusting assembly (4).

4. The adjustable osteotome of claim 1, wherein, The adjusting assembly (4) further comprises a second knob (48) and a handle (49), and the mounting bracket (41) is fixedly installed on the main body rack (1); a fixed screw rod (43) is fixedly installed between the two extending arms of the mounting bracket (41), a limiting adjusting plate (42) is slidably installed on the fixed screw rod (43), and the lower end surface of the limiting adjusting plate (42) is arranged in abutment with the upper end surface of the main body rack (1); the limiting adjusting plate (42) is provided with an adjusting seat (46) rotatably connected thereto, and the handle (49) is fixedly installed on the adjusting seat (46); the adjusting seat (46) is provided with a rotating screw rod (44) rotatably connected thereto, and the second knob (48) is fixedly installed at the end of the rotating screw rod (44); a strip-shaped plate (45) is fixedly installed on the adjusting seat (46), and the adjusting plate is provided with a guide limiting screw (410), and the guide limiting screw (410) is externally sleeved with a compression spring (47).

5. The adjustable osteotome of claim 4, wherein, The limiting adjusting plate (42) is fixedly installed with a first pin shaft (411), and the adjusting seat (46) is rotatably installed on the first pin shaft (411); a clamping spring is installed between the adjusting seat (46) and the first pin shaft (411), and the clamping spring is arranged in abutment with the side wall of the adjusting seat (46).

6. The adjustable osteotome of claim 4, wherein, The bottom of the fixed screw rod (43) is provided with a first thread (412), the rotating screw rod (44) is provided with a second thread (413), and the first thread (412) and the second thread (413) are engaged with each other; the rotating screw rod (44) is arranged below the fixed screw rod (43); when the rotating screw rod (44) rotates relative to the fixed screw rod (43), the limiting adjusting plate (42) moves along the axial direction of the fixed screw rod (43).

7. The adjustable osteotome of claim 4, wherein, The compression spring (47) is sleeved on the guide limiting screw (410); one end of the compression spring (47) is fixedly installed on the limiting adjusting plate (42), and the other end of the compression spring (47) is fixedly installed on the strip-shaped plate (45); in the default state, the fixed screw rod (43) and the rotating screw rod (44) are engaged with each other, and the compression spring (47) is in a compressed state; the side surface of the limiting adjusting plate (42) is fixedly installed with a side edge baffle (5), the bottom of the side edge baffle (5) is arranged in abutment with the main body rack (1), and the side wall of the side edge baffle (5) is arranged in parallel with the push plate (32).

8. The adjustable osteotome of claim 1, wherein, The support frame (31) is provided with a pair of guide protrusions (33), and the push plate (32) is slidably installed on the guide protrusions (33); the guide protrusions (33) are provided with clamping grooves (34), and the bottom of the push plate (32) is provided with a limiting strip (35); the limiting strip (35) is arranged in the clamping groove (34), and the outer contour of the limiting strip (35) is matched with the outer contour of the clamping groove (34); the both ends of the support frame (31) are provided with buffer members (36), and the push plate (32) is arranged between the two buffer members (36); the upper end surface of the push plate (32) is arranged in flush with the upper end surface of the main machine rack.

9. The adjustable osteotome of claim 1, wherein, The main body rack (1) is further provided with a limiting component (8) for limiting the movement of the limiting and positioning adjusting plate (42); the limiting component (8) comprises a first screw rod (81), a third knob (82) and a limiting member body (83); the first screw rod (81) is screwed with the main body rack, one end of the first screw rod (81) is fixedly provided with the third knob (82), and the other end of the first screw rod (81) is fixedly provided with the limiting member body (83); the limiting member body (83) is provided towards the side edge baffle (5), and the limiting member body (83) and the side edge baffle (5) are provided in parallel with each other.

Images