Small portable joint cutting device

Abstract

The invention provides a small portable joint cutting device, and belongs to the field of architectural engineering decoration. According to the technical scheme, a cutting machine is fixedly installed on the bottom frame and comprises a machine body and a cutting blade set, the cutting blade set is installed at the output shaft end of the cutting machine and located on one side of the front end of the bottom frame, the cutting blade set comprises an installation shaft, a plurality of sets of circular blades are arranged on the installation shaft, and idler wheels are arranged at the position, close to the rear end, of the lower portion of the bottom frame through a support. A cutting depth adjusting mechanism is arranged at the front end of the bottom frame and comprises a support rod arranged on the side face of the bottom frame, and a limiting round rod coaxial with the mounting shaft is arranged on the support rod. The seam cutting device has the beneficial effects that the structure is simple, seam cutting can be achieved only by pushing a handle during operation, the working process is stable, the cut seam depth is uniform, meanwhile, seams with different widths can be cut according to requirements, and the working efficiency and the working quality are improved.

Description

Technical Field

[0001] The invention relates to the field of building engineering decoration and renovation, and in particular to a small portable seam cutting device. Background Art

[0002] In the field of construction, concrete floors and ground surfaces are widely used for decoration and renovation projects. Since concrete is prone to shrinkage cracks during the solidification process, it is often used to cut grid seams and fill the seams with flexible materials to resist cracks caused by changes in concrete stress. In the past, a small handheld cutting machine 2 was often used to cut two slits at a preset position according to a preset seam width, and then the excess concrete between the gaps was removed to form a separation seam effect. This method is relatively cumbersome to operate, the handheld cutting tool has poor stability, the depth of the slits cut by the tool is inconsistent during operation, and there are safety hazards. In response to this problem, we have improved the traditional cutting tool and proposed a small portable cutting device. Summary of the invention

[0003] The object of the present invention is to provide a small portable slitting device which is easy to operate, improves tool stability during slitting operations, and improves operation efficiency and operation quality.

[0004] The present invention is achieved by the following measures:

[0005] A small portable slitting device, characterized in that it comprises a base frame, a cutting machine is fixedly mounted on the base frame, the cutting machine comprises a body and a cutting blade group, the cutting blade group is mounted on the output shaft end of the cutting machine and is located on one side of the front end of the base frame, the cutting blade group comprises a mounting shaft, a plurality of groups of circular blades are arranged on the mounting shaft, and specifically the mounting shaft is mounted on the output end of the motor of the cutting machine;

[0006] A roller is arranged through a bracket at the lower part of the base frame near the rear end, and a cutting depth adjustment mechanism is arranged at the front end of the base frame, and the cutting depth adjustment mechanism includes a bracket rod arranged on the side of the base frame, and a limiting round rod coaxial with the installation axis is arranged on the bracket rod, and an auxiliary round rod coaxial with the limiting round rod is arranged on the other side of the base frame, and a door-shaped frame is slidingly arranged around the limiting round rod and the auxiliary round rod, and a height limiting plate cooperating with the limiting round rod is arranged on the door-shaped frame.

[0007] The specific features of the present invention also include:

[0008] The vertical side plates on both sides of the door-shaped frame are provided with sliding grooves, the limiting round rod and the auxiliary round rod are respectively slidably arranged in the sliding grooves on the corresponding sides, the lower ends of the vertical side plates on both sides are provided with bottom plates, and the lower side surfaces of the bottom plates on both sides are provided with a pair of rolling wheels;

[0009] A motor is arranged on the vertical side plate close to the limiting round rod through a bracket plate, a screw rod is arranged on the output end of the motor, the lower end of the screw rod is rotatably arranged on the bottom plate on the corresponding side, a screw rod slider is arranged on the periphery of the screw rod, the height limiting plate is arranged on the screw rod slider, and the height limiting plate is slidably arranged in the slide groove on the corresponding side;

[0010] The outer surface of the vertical side plate on the corresponding side is provided with a scale matching the height limit plate. The cutting depth is obtained by subtracting the radius of the circular blade from the radius of the mounting shaft and then subtracting the distance from the height limit plate to the ground. The height of the height limit plate can be adjusted by the cooperation of the motor and the screw rod, thereby adjusting the cutting depth. Due to the limitation of the height limit plate, the cutting depth of the circular blade will remain consistent.

[0011] The height limiting plate is provided with a vertical plate, a rectangular plate is slidably provided on the vertical plate, an upper end of the rectangular plate close to the center of the corresponding slide groove is provided with an inclined surface matched with the limiting round rod, and the distance between the lower side of the rectangular plate and the upper side of the height limiting plate is matched with the diameter of the limiting round rod, that is, the limiting round rod can be just stuck between the rectangular plate and the height limiting plate;

[0012] A handle is provided at one end of the rectangular plate away from the inclined surface, and a spring is provided on the periphery of the rectangular plate between the handle and the vertical plate, one end of the spring is fixed to the handle, and the other end of the spring is fixed to the vertical plate. When the limiting round rod slides down and is pressed on the inclined surface, the rectangular plate will be pushed outwards against the force of the spring, and then stuck between the rectangular plate and the height limiting plate to maintain the position of the cutting blade group, so as to facilitate stable cutting. By pulling the handle, the locking of the limiting round rod by the rectangular plate can be released.

[0013] A rotating plate is provided at the center of the handle, and a push rod is provided on the rotating plate. A through hole cooperating with the push rod is provided on the vertical plate, and the push rod is provided in the through hole. When the handle is pulled backward, the push rod is disengaged from the through hole. At this time, the rectangular plate will not be disengaged from the vertical plate. Then, the rotating plate is rotated, and under the action of the spring, the push rod is pressed against the side surface of the vertical plate, thereby maintaining the state of the rectangular plate and facilitating the sliding of the limiting round rod. Finally, the handle is pulled and the push rod is inserted into the through hole again, so that the rectangular plate is reset.

[0014] The installation shaft includes a thick shaft in the middle and thin shafts arranged at both ends of the thick shaft, the outer surface of the thick shaft is provided with an external spline, and the circular blades are provided with three groups in total, one group of the circular blades is fixed in the middle of the thick shaft, and the other two groups of the circular blades are respectively slidably arranged on both sides of the fixed circular blades through an internal spline arranged in the center;

[0015] The outer peripheries of the thin shafts on both sides are provided with nuts through thread structures, and the inner ends of the nuts on both sides are rotatably provided with inner sleeves, and the inner sleeves are slidably provided on the outer periphery of the thick shaft through two inner splines matched with the outer splines;

[0016] The outer sleeve is rotatably provided with an outer sleeve through an annular groove provided on the periphery of the inner sleeve, a pair of L-shaped plates are provided on the inner side of the outer sleeve facing the circular blade, and a corresponding insertion hole matching with the L-shaped plate is provided on the circular blade, and an arc-shaped hole matching with the horizontal plate of the L-shaped plate is provided on one side of the insertion hole;

[0017] The outer side surface of the outer sleeve is provided with a locking bolt for fixing the outer sleeve on the inner sleeve. When the L-shaped plate is inserted into the insertion hole, the outer sleeve is rotated, and the horizontal plate of the L-shaped plate rotates along the arc hole. At this time, the vertical plate of the L-shaped plate is abutted against the side of the circular blade. The outer sleeve is then fixed by the locking bolt, and the distance between the sliding circular blade and the circular blade fixed in the middle is adjusted by rotating the nut to achieve the setting of the cutting width.

[0018] The distance between the vertical plate of the L-shaped plate and the inner sleeve matches the thickness of the circular blade, that is, after the outer sleeve rotates, the circular blade is just stuck between the vertical plate of the L-shaped plate and the edge of the inner sleeve and will not move, thereby ensuring cutting stability.

[0019] The front end of the base frame is provided with a mounting groove, a circular shaft is provided in the mounting groove, a long rod is rotatably provided on the periphery of the circular shaft, a positioning piece is provided at the free end of the long rod, the positioning piece is aligned with the fixed circular blade, the positioning piece is used to calibrate the cutting position, and the cutting position line is drawn on the ground in advance during cutting, and then accurate cutting is achieved by aligning the positioning piece with the cutting line.

[0020] Torsion springs are arranged on the peripheries of the circular shafts on both sides of the long bar, one end of the torsion spring is fixed on the long bar, and the other end of the torsion spring is fixed on the corresponding side surface of the mounting groove.

[0021] A pair of rotating wheels are provided at the lower front end of the positioning piece through a rotating shaft, and the pair of rotating wheels are respectively provided on both sides of the positioning piece. Initially, the positioning piece is inclined downward. When the cutting piece group is pressed down to the ground, the rotating wheels are against the ground, thereby avoiding the adjustment of the positioning piece due to different cutting depths. If not adjusted, the positioning piece may interfere with the ground. The structure provided in this embodiment can ensure that under various cutting depth conditions, the positioning piece always maintains a close distance to the ground, which is convenient for the operator to align it with the cutting line.

[0022] A handle is provided at the rear end of the base frame, and a winding rod is provided on the handle, and the winding rod is used to wind the wire of the cutting machine;

[0023] A protective shell is also arranged around the cutting blade assembly.

[0024] Here’s how to use it:

[0025] A1. Clean the surface debris of the base layer according to the specification requirements. Ensure that there is no debris on the concrete surface where the seams need to be cut, and ensure that the seam cutting device moves smoothly and without obstacles.

[0026] A2. Layout the split seam position according to the drawings and specifications. Mark the split seam position according to the layout with an ink fountain to the surface of the construction base to form the split seam line;

[0027] A3. According to the depth to be cut, the height of the height limit plate is adjusted by the motor. According to the slit width, the distance between the circular blades is adjusted by turning the nut to ensure that the distance between the two outer circular blades and the fixed circular blade in the middle is equal. The feeler gauge can be used for calibration.

[0028] A4. Turn on the power, start the cutting machine and wind the excess wire around the winding frame, then lift the handle to move the cutting blade assembly downward for cutting. During cutting, ensure that the positioning blade is aligned with the cutting line.

[0029] The beneficial effects of the present invention are as follows: the device has a simple structure, and can be operated by pushing the handle to achieve the cutting of the seams. The working process is smooth, and the depth of the cut seams is uniform. At the same time, seams of different widths can be cut according to requirements, thereby improving work efficiency and work quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention.

[0031] Figure 2 for Figure 1 A is an enlarged view of the middle image.

[0032] Figure 3 Schematic diagram of the front-end structure of an embodiment of the present invention.

[0033] Figure 4 It is a schematic diagram of the structure of installing the shaft in an embodiment of the present invention.

[0034] Figure 5 It is a schematic diagram of the structure of the inner sleeve and the outer sleeve in an embodiment of the present invention.

[0035] Figure 6 Schematic diagram of the structure of a circular blade in an embodiment of the present invention.

[0036] Among them, the figure markings are: 1, base frame; 2, cutting machine; 3, door frame; 4, roller; 5, motor; 6, bracket rod; 7, screw rod; 8, limit round rod; 9, slide groove; 10, bottom plate; 11, height limit plate; 12, circular blade; 13, long rod; 14, positioning piece; 15, rotating wheel; 16, handle; 17, winding rod; 18, vertical plate; 19, spring; 20, handle; 21, rotating plate; 22, push rod; 23, rectangular plate; 24, nut; 25, thin shaft; 26 outer sleeve; 27, mounting groove; 28, outer spline; 29, inner sleeve; 30, inner spline two; 31, L-shaped plate; 32, inner spline one; 33, jack; 34, arc hole. DETAILED DESCRIPTION

[0037] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0038] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0040] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.

[0041] See also Figure 1-Figure 6 A small portable slitting device includes a base frame 1, a cutting machine 2 is fixedly mounted on the base frame 1, the cutting machine 2 includes a body and a cutting blade group, the cutting blade group is mounted on the output shaft end of the cutting machine 2 and is located on one side of the front end of the base frame 1, the cutting blade group includes a mounting shaft, and a plurality of groups of circular blades 12 are arranged on the mounting shaft, and the mounting shaft is specifically mounted on the output end of the motor of the cutting machine 2;

[0042] A roller 4 is arranged through a bracket at the lower part of the base frame 1 near the rear end, and a cutting depth adjustment mechanism is arranged at the front end of the base frame 1. The cutting depth adjustment mechanism includes a bracket rod 6 arranged on the side of the base frame 1, and a limiting round rod 8 coaxial with the installation axis is arranged on the bracket rod 6. An auxiliary round rod coaxial with the limiting round rod 8 is arranged on the other side of the base frame 1. A door-shaped frame 3 is slidably arranged around the limiting round rod 8 and the auxiliary round rod, and a height limiting plate 11 cooperating with the limiting round rod 8 is arranged on the door-shaped frame 3.

[0043] The vertical side plates on both sides of the door-shaped frame 3 are provided with slide grooves 9, and the limiting round rod 8 and the auxiliary round rod are respectively slidably arranged in the slide grooves 9 on the corresponding sides. The lower ends of the vertical side plates on both sides are provided with bottom plates 10, and the lower sides of the bottom plates 10 on both sides are provided with a pair of rolling wheels;

[0044] A motor 5 is arranged on the vertical side plate near the limiting round rod 8 through a bracket plate, a screw rod 7 is arranged at the output end of the motor 5, the lower end of the screw rod 7 is rotatably arranged on the corresponding side bottom plate 10, a screw rod slider is arranged on the outer periphery of the screw rod 7, a height limiting plate 11 is arranged on the screw rod slider, and the height limiting plate 11 is slidably arranged in the corresponding side slide groove 9;

[0045] The outer surface of the corresponding side vertical side plate is provided with a scale matching the height limit plate 11. The cutting depth is obtained by subtracting the radius of the circular blade 12 from the radius of the mounting shaft and then subtracting the distance from the height limit plate 11 to the ground. The height of the height limit plate 11 can be adjusted by the cooperation of the motor 5 and the screw rod 7, thereby adjusting the cutting depth. Due to the limitation of the height limit plate 11, the cutting depth of the circular blade 12 will remain consistent.

[0046] A vertical plate 18 is provided on the height limiting plate 11, and a rectangular plate 23 is slidably provided on the vertical plate 18. An inclined surface matching the limiting round rod 8 is provided at the upper end of the rectangular plate 23 close to the center of the corresponding chute 9. The distance between the lower side of the rectangular plate 23 and the upper side of the height limiting plate 11 matches the diameter of the limiting round rod 8, that is, the limiting round rod 8 can be just stuck between the rectangular plate 23 and the height limiting plate 11;

[0047] A handle 20 is provided at one end of the rectangular plate 23 away from the inclined surface, and a spring 19 is provided on the periphery of the rectangular plate 23 between the handle 20 and the vertical plate 18. One end of the spring 19 is fixed on the handle 20, and the other end of the spring 19 is fixed on the vertical plate 18. When the limiting round rod 8 slides down and is squeezed on the inclined surface, it will overcome the force of the spring 19 to push the rectangular plate 23 outward, and then get stuck between the rectangular plate 23 and the height limiting plate 11, so as to maintain the position of the cutting blade group and facilitate stable cutting. By pulling the handle 20, the locking of the limiting round rod 8 by the rectangular plate 23 can be released.

[0048] A rotating plate 21 is provided at the center of the handle 20, and a push rod 22 is provided on the rotating plate 21. A through hole matching the push rod 22 is provided on the vertical plate 18, and the push rod 22 is arranged in the through hole. When the handle 20 is pulled backward, the push rod 22 is disengaged from the through hole. At this time, the rectangular plate 23 will not be disengaged from the vertical plate 18. Then, the rotating plate 21 is rotated. Under the action of the spring 19, the push rod 22 is pressed against the side of the vertical plate 18, thereby maintaining the state of the rectangular plate 23, facilitating the sliding of the limiting round rod 8, and finally, by pulling the handle 20 and inserting the push rod 22 into the through hole again, the rectangular plate 23 is reset.

[0049] The mounting shaft includes a thick shaft in the middle and thin shafts 25 arranged at both ends of the thick shaft. The outer surface of the thick shaft is provided with an external spline 28. There are three groups of circular blades 12. One group of circular blades 12 is fixed in the middle of the thick shaft, and the other two groups of circular blades 12 are slidably arranged on both sides of the fixed circular blades 12 through an internal spline 32 arranged in the center.

[0050] The outer periphery of the thin shafts 25 on both sides is provided with nuts 24 through a threaded structure, and the inner side ends of the nuts 24 on both sides are rotatably provided with inner sleeves 29, and the inner sleeves 29 are slidably provided on the outer periphery of the thick shaft through the inner spline 2 30 matched with the outer spline 28;

[0051] The outer sleeve 26 is rotatably arranged on the periphery of the inner sleeve 29 through the annular groove, and a pair of L-shaped plates 31 are arranged on the inner side of the outer sleeve 26 facing the circular blade 12, and a corresponding circular blade 12 is provided with a plug hole 33 that matches the L-shaped plate 31, and an arc hole 34 that matches the horizontal plate of the L-shaped plate 31 is arranged on one side of the plug hole 33;

[0052] The outer surface of the outer sleeve 26 is provided with a locking bolt for fixing the outer sleeve 26 to the inner sleeve 29. When the L-shaped plate 31 is inserted into the insertion hole 33, the outer sleeve 26 is rotated, and the horizontal plate of the L-shaped plate 31 rotates along the arc hole 34. At this time, the vertical plate of the L-shaped plate 31 is abutted against the side of the circular blade 12. Then, the outer sleeve 26 is fixed by the locking bolt, and then the distance between the sliding circular blade 12 and the middle fixed circular blade 12 is adjusted by rotating the nut 24 to achieve the setting of the cutting width.

[0053] The distance between the vertical plate of the L-shaped plate 31 and the inner sleeve 29 matches the thickness of the circular blade 12, that is, after the outer sleeve 26 rotates, the circular blade 12 is just stuck between the vertical plate of the L-shaped plate 31 and the edge of the inner sleeve 29 and will not move, thereby ensuring cutting stability.

[0054] A mounting groove 27 is provided at the front end of the base frame 1, a circular shaft is provided in the mounting groove 27, a long rod 13 is rotatably provided on the outer periphery of the circular shaft, a positioning piece 14 is provided at the free end of the long rod 13, the positioning piece 14 is aligned with the fixed circular blade 12, and the positioning piece 14 is used to calibrate the cutting position. When cutting, the cutting position line is drawn on the ground in advance, and then accurate cutting is achieved by aligning the positioning piece 14 with the cutting line.

[0055] Torsion springs are arranged on the peripheries of the circular shafts on both sides of the long rod 13 , one end of the torsion spring is fixed on the long rod 13 , and the other end of the torsion spring is fixed on the corresponding side surface of the mounting groove 27 .

[0056] A pair of rotating wheels 15 are provided at the lower front end of the positioning piece 14 through a rotating shaft. The pair of rotating wheels 15 are respectively arranged on both sides of the positioning piece 14. Initially, the positioning piece 14 is inclined downward. When the cutting piece group is pressed down to the ground, the rotating wheels 15 are against the ground, thereby avoiding the adjustment of the positioning piece 14 due to different cutting depths. If it is not adjusted, the positioning piece 14 may interfere with the ground. The structure provided in this embodiment can ensure that under various cutting depth conditions, the positioning piece 14 always maintains a close distance to the ground, which is convenient for the operator to align it with the cutting line.

[0057] A handle 16 is provided at the rear end of the base frame 1, and a winding rod 17 is provided on the handle 16. The winding rod 17 is used to wind the wire of the cutting machine 2;

[0058] A protective shell 23 is also provided around the cutting blade assembly.

[0059] Here’s how to use it:

[0060] A1. Clean the surface debris of the base layer according to the specification requirements. Ensure that there is no debris on the concrete surface where the seams need to be cut, and ensure that the seam cutting device moves smoothly and without obstacles.

[0061] A2. Layout the split seam position according to the drawings and specifications. Mark the split seam position according to the layout with an ink fountain to the surface of the construction base to form the split seam line;

[0062] A3. According to the depth to be cut, the height of the height limit plate 11 is adjusted by the motor 5. According to the slit width, the distance between the circular blades 12 is adjusted by rotating the nut 24 to ensure that the distance between the two outer circular blades 12 and the fixed central circular blade 12 is equal. The feeler gauge can be used for calibration.

[0063] A4. Turn on the power, start the cutting machine 2 and wind the excess wire around the winding frame, then lift the handle 16 to move the cutting blade assembly downward for cutting. During cutting, ensure that the positioning blade 14 is aligned with the cutting line.

[0064] Technical features not described in the present invention can be achieved through or by adopting existing technologies and will not be described in detail here. Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention should also fall within the scope of protection of the present invention.

Claims

1. A small portable slitting device, characterized in that: The invention comprises a base frame (1), a cutting machine (2) is fixedly mounted on the base frame (1), the cutting machine (2) comprises a body and a cutting blade group, the cutting blade group is mounted on the output shaft end of the cutting machine (2) and is located on one side of the front end of the base frame (1), the cutting blade group comprises a mounting shaft, and a plurality of groups of circular blades (12) are arranged on the mounting shaft; A roller (4) is arranged at the lower part of the base frame (1) near the rear end through a bracket, and a cutting depth adjustment mechanism is arranged at the front end of the base frame (1), and the cutting depth adjustment mechanism comprises a bracket rod (6) arranged on the side of the base frame (1), and a limiting round rod (8) coaxial with the installation axis is arranged on the bracket rod (6), and an auxiliary round rod coaxial with the limiting round rod (8) is arranged on the other side of the base frame (1), and a door-shaped frame (3) is slidably arranged around the limiting round rod (8) and the auxiliary round rod, and a height limiting plate (11) cooperating with the limiting round rod (8) is arranged on the door-shaped frame (3).

2. The small portable slitting device according to claim 1, characterized in that: The vertical side plates on both sides of the door-shaped frame (3) are provided with sliding grooves (9), the limiting round rod (8) and the auxiliary round rod are respectively slidably arranged in the sliding grooves (9) on the corresponding sides, the lower ends of the vertical side plates on both sides are provided with bottom plates (10), and the lower side surfaces of the bottom plates (10) on both sides are provided with a pair of rolling wheels; A motor (5) is arranged on the vertical side plate close to the limiting round rod (8) through a bracket plate, a screw rod (7) is arranged at the output end of the motor (5), the lower end of the screw rod (7) is rotatably arranged on the bottom plate (10) on the corresponding side, a screw rod slider is arranged on the periphery of the screw rod (7), the height limiting plate (11) is arranged on the screw rod slider, and the height limiting plate (11) is slidably arranged in the slide groove (9) on the corresponding side; The outer side surface of the vertical side plate on the corresponding side is provided with a scale matching the height limiting plate (11).

3. The small portable slitting device according to claim 2, characterized in that: The height limiting plate (11) is provided with a vertical plate (18), and a rectangular plate (23) is slidably provided on the vertical plate (18), and an inclined surface matching with the limiting round rod (8) is provided at the upper end of the rectangular plate (23) close to the center of the corresponding sliding groove (9), and the distance between the lower side of the rectangular plate (23) and the upper side of the height limiting plate (11) matches the diameter of the limiting round rod (8); A handle (20) is provided at one end of the rectangular plate (23) away from the inclined surface, and a spring (19) is provided on the periphery of the rectangular plate (23) between the handle (20) and the vertical plate (18), one end of the spring (19) is fixed to the handle (20), and the other end of the spring (19) is fixed to the vertical plate (18).

4. The small portable slitting device according to claim 3, characterized in that: A rotating plate (21) is arranged at the center of the handle (20), a push rod (22) is arranged on the rotating plate (21), a through hole matching with the push rod (22) is arranged on the vertical plate (18), and the push rod (22) is arranged in the through hole.

5. The small portable slitting device according to claim 1, characterized in that: The installation shaft comprises a thick shaft in the middle and thin shafts (25) arranged at both ends of the thick shaft, the outer surface of the thick shaft is provided with an external spline (28), and the circular blades (12) are provided in three groups, one group of the circular blades (12) is fixed in the middle of the thick shaft, and the other two groups of the circular blades (12) are slidably arranged on both sides of the fixed circular blades (12) through an internal spline (32) arranged in the center; The outer peripheries of the thin shafts (25) on both sides are provided with nuts (24) through threaded structures, and the inner ends of the nuts (24) on both sides are rotatably provided with inner sleeves (29), and the inner sleeves (29) are slidably provided on the outer periphery of the thick shaft through the second inner spline (30) matched with the outer spline (28); An outer sleeve (26) is rotatably arranged on the periphery of the inner sleeve (29) through an annular groove, a pair of L-shaped plates (31) are arranged on the inner side surface of the outer sleeve (26) facing the circular blade (12), and correspondingly, a plug hole (33) cooperating with the L-shaped plate (31) is arranged on the circular blade (12), and an arc-shaped hole (34) cooperating with the horizontal plate of the L-shaped plate (31) is arranged on one side of the plug hole (33); The outer side surface of the outer sleeve (26) is provided with locking bolts for fixing the outer sleeve (26) to the inner sleeve (29).

6. The small portable slitting device according to claim 5, characterized in that: The distance between the vertical plate of the L-shaped plate (31) and the inner sleeve (29) matches the thickness of the circular blade (12).

7. The small portable slitting device according to claim 5, characterized in that: The front end of the base frame (1) is provided with a mounting groove (27), a circular shaft is provided in the mounting groove (27), a long bar (13) is rotatably provided on the periphery of the circular shaft, a positioning piece (14) is provided at the free end of the long bar (13), and the positioning piece (14) is aligned with the fixed circular blade (12).

8. The small portable slitting device according to claim 7, characterized in that: Torsion springs are arranged on the peripheries of the circular shafts on both sides of the long bar (13), one end of the torsion spring is fixed to the long bar (13), and the other end of the torsion spring is fixed to the corresponding side surface of the installation groove (27).

9. The small portable slitting device according to claim 8, characterized in that: A pair of rotating wheels (15) are arranged at the lower end of the front side of the positioning piece (14) via a rotating shaft, and the pair of rotating wheels (15) are respectively arranged on both sides of the positioning piece (14).

10. The small portable slitting device according to claim 1, characterized in that: A handle (16) is provided at the rear end of the base frame (1), and a winding rod (17) is provided on the handle (16); A protective shell (23) is also provided around the cutting blade assembly.

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