A small portable seam cutter

Abstract

The application provides a small portable cutting device, belonging to the field of building engineering decoration. The technical scheme is: including a chassis, a cutting machine is fixedly installed on the chassis, the cutting machine includes a machine body and a cutting piece group, the cutting piece group is installed at the output shaft end of the cutting machine and at one side of the front end of the chassis, the cutting piece group includes an installation shaft, a plurality of groups of circular blades are arranged on the installation shaft, a roller is arranged on the lower part of the chassis near the rear end through a support, a cutting depth adjusting mechanism is arranged at the front end of the chassis, the cutting depth adjusting mechanism includes a support rod arranged on the side surface of the chassis, and a limiting round rod coaxial with the installation shaft is arranged on the support rod. The application has the beneficial effects that: the device has a simple structure, and only needs to be pushed by a handle during operation to realize the cutting of the seam, the working process is stable, the cutting seam depth is uniform, different width seams can be cut according to requirements, and the working efficiency and working quality are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of architectural engineering decoration, and more particularly to a small portable cutting joint device. BACKGROUND

[0002] In the field of building construction, the concrete floor and ground of decoration engineering is a more widely used decoration method. Since the concrete is prone to shrinkage cracks during the solidification process, the method of cutting joint and filling flexible materials in the joint is often used to resist the cracks caused by the stress changes of the concrete. In the past, a small handheld cutting machine 2 was used to cut two gaps according to the preset joint width at the preset position, and then the excess concrete between the gaps was removed, thereby forming the effect of the separation joint. This method is relatively cumbersome to operate, the handheld cutting tool has poor stability, and the cutting depth of the tool during operation is inconsistent and has safety hazards. In view of this problem, we improve the traditional cutting tool and propose a small portable cutting joint device. SUMMARY

[0003] The purpose of the present application is to provide a small portable cutting joint device which is simple to operate, improves the stability of the tool during cutting joint operation, and improves the operation efficiency and quality.

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

[0005] A small portable cutting joint device, characterized in that it comprises a chassis, a cutting machine is fixedly installed on the chassis, the cutting machine comprises a machine body and a cutting blade group, the cutting blade group is installed at the output shaft end of the cutting machine and at one side of the front end of the chassis, the cutting blade group comprises an installation shaft, a plurality of groups of circular blades are arranged on the installation shaft, and specifically the installation shaft is installed on the output end of the motor of the cutting machine.

[0006] A roller is arranged on the lower part of the chassis near the rear end through a support, a cutting depth adjusting mechanism is arranged at the front end of the chassis, the cutting depth adjusting mechanism comprises a support rod arranged on the side of the chassis, a limiting circular rod coaxial with the installation shaft is arranged on the support rod, an auxiliary circular rod coaxial with the limiting circular rod is arranged on the other side of the chassis, a door-shaped frame is slidably arranged on the periphery of the limiting circular rod and the auxiliary circular rod, and a height limiting plate matched with the limiting circular rod is arranged on the door-shaped frame.

[0007] The specific features of the present application are:

[0008] The door-shaped frame is arranged on the periphery of the limiting circular rod and the auxiliary circular rod, and a height limiting plate matched with the limiting circular rod is arranged on the door-shaped frame.

[0009] A motor is arranged on the vertical side plate near the limiting round rod through a support plate, an output end of the motor is provided with a lead screw, a lower end of the lead screw is rotationally arranged on the bottom plate of the corresponding side, a lead screw sliding block is arranged on the periphery of the lead screw, the height limiting plate is arranged on the lead screw sliding block and is slidingly arranged in the sliding groove of the corresponding side;

[0010] A scale matched with the height limiting plate is arranged on the outer side of the vertical side plate, the radius of the circular blade is subtracted from the radius of the mounting shaft, and then the distance from the height limiting plate to the ground is subtracted to obtain the cutting depth, the height of the height limiting plate can be adjusted through the cooperation of the motor and the lead screw, so as to adjust the cutting depth, and due to the limitation of the height limiting plate, the cutting depth of the circular blade will remain consistent.

[0011] A vertical plate is arranged on the height limiting plate, a rectangular plate is slidingly arranged on the vertical plate, an inclined surface matched with the limiting round rod is arranged on the upper end of the rectangular plate near the center of the corresponding sliding groove, 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 clamped between the rectangular plate and the height limiting plate;

[0012] One end of the spring is fixed on the handle, and the other end of the spring is fixed on the vertical plate, when the limiting round rod slides downward and is pressed on the inclined surface, the rectangular plate will be pushed outward against the force of the spring, and then it is clamped between the rectangular plate and the height limiting plate, so as to keep the position of the cutting piece group and facilitate stable cutting, and the handle can be pulled to release the locking of the rectangular plate on the limiting round rod.

[0013] A rotating plate is arranged at the center of the handle, a top rod is arranged on the rotating plate, a through hole matched with the top rod is arranged on the vertical plate, and the top rod is arranged in the through hole, when the handle is pulled backward, the top rod is separated from the through hole, at this time, the rectangular plate will not be separated from the vertical plate, then the rotating plate is rotated, the top rod is pressed on the side surface of the vertical plate under the action of the spring, so as to keep the state of the rectangular plate, the limiting round rod is conveniently slid upward, finally the handle is pulled again, the top rod is inserted into the through hole again, and the rectangular plate is reset.

[0014] The mounting shaft comprises a middle thick shaft and thin shafts arranged at both ends of the thick shaft, the outer surface of the thick shaft is provided with external splines, the circular blades are provided with three groups, one group of the circular blades is fixed at the middle of the thick shaft, and the other two groups of the circular blades are respectively arranged at both sides of the fixed circular blades through the internally arranged internal splines two.

[0015] The outer periphery of the thin shafts on both sides is provided with nuts through thread structure, the opposite inner side ends of the nuts are rotatably provided with inner sleeves, and the inner sleeves are arranged on the outer periphery of the thick shaft through the arranged internal splines two matched with the external splines.

[0016] The outer periphery of the inner sleeve is rotatably provided with an outer sleeve through the arranged annular groove, a pair of L-shaped plates are arranged on the inner side surface of the outer sleeve facing the circular blades, corresponding arc-shaped holes matched with the horizontal plates of the L-shaped plates are arranged on the circular blades.

[0017] Locking bolts for fixing the outer sleeve on the inner sleeve are arranged on the outer side surface of the outer sleeve, when the L-shaped plates are inserted into the arc-shaped holes, the horizontal plates of the L-shaped plates are rotated, at this time, the vertical plates of the L-shaped plates are attached to the side surface of the circular blades, then the outer sleeve is fixed through the locking bolts, and then the distance between the sliding circular blades and the fixed circular blades in the middle is adjusted through the rotating nuts, so that the cutting width is set.

[0018] The distance between the vertical plates of the L-shaped plates and the inner sleeve is matched with the thickness of the circular blades, that is, after the outer sleeve is rotated, the circular blades are just clamped between the vertical plates of the L-shaped plates and the edges of the inner sleeve, and cannot be moved, so that the cutting stability is ensured.

[0019] The front end of the base frame is provided with a mounting groove, a circular shaft is arranged in the mounting groove, a long rod is rotatably arranged on the outer periphery of the circular shaft, a positioning piece is arranged on the free end of the long rod, the positioning piece is aligned with the fixed circular blade, and the positioning piece is used for calibrating the cutting position.

[0020] The outer periphery of the circular shaft on both sides of the long rod is provided with a torsion spring, one end of the torsion spring is fixed on the long rod, and the other end of the torsion spring is fixed on the corresponding side surface of the mounting groove.

[0021] The lower front end of the positioning plate is equipped with a pair of rotating wheels via a pivot. The pair of rotating wheels are respectively located on both sides of the positioning plate. Initially, the positioning plate is angled downwards. When the cutting plate assembly is pressed down to the ground, the rotating wheels rest against the ground, thereby avoiding the need to adjust the positioning plate for different cutting depths. If not adjusted, the positioning plate may interfere with the ground. The structure provided in this embodiment can ensure that the positioning plate always maintains a relatively close distance from the ground under various cutting depth conditions, making it easy for the operator to align it with the cutting line.

[0022] The base frame is provided with a handle at the rear end, and a winding rod is provided on the handle for winding the wire of the cutting machine;

[0023] The cutting disc assembly is also surrounded by a protective shell.

[0024] The usage method is as follows:

[0025] A1. Clean the surface of the base layer according to the specifications. Ensure that the concrete surface at the location where the joint needs to be cut is free of debris, and ensure that the joint cutting device moves smoothly and without obstruction.

[0026] A2. Arrange the locations of the expansion joints according to the drawings and specifications. Use a chalk line to mark the joint locations onto the surface of the substrate, forming the joint lines.

[0027] A3. Adjust the height of the height limiting plate by the motor according to the depth to be cut. Adjust the distance between the circular blades by rotating the nut according to the width of the cut to ensure that the distance between the two outer circular blades and the middle fixed circular blade is equal. A feeler gauge can be used for calibration.

[0028] A4. Connect the power supply, start the cutting machine and wrap the excess wire around the winding frame. Then lift the handle to lower the cutting blade assembly and start cutting. During cutting, ensure that the positioning plate is aligned with the cutting line.

[0029] The beneficial effects of this invention are as follows: the device has a simple structure, and the cutting of the seam can be achieved simply by pushing the handle during operation. The working process is stable, and the depth of the cut seam is uniform. At the same time, it can cut seams of different widths according to requirements, thereby improving work efficiency and work quality. Attached Figure Description

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

[0031] Figure 2 for Figure 1 A magnified view of A in the middle.

[0032] Figure 3 This is a schematic diagram of the front-end structure according to an embodiment of the present invention.

[0033] Figure 4 It is a structure schematic view of the installed shaft in the embodiment of the application.

[0034] Figure 5 It is a structure schematic view of the inner sleeve and outer sleeve in the embodiment of the application,

[0035] Figure 6 It is a structure schematic view of the circular blade in the embodiment of the application.

[0036] Wherein, the reference signs are: 1, base frame; 2, cutting machine; 3, door-shaped frame; 4, roller; 5, motor; 6, support rod; 7, screw rod; 8, limiting round rod; 9, sliding groove; 10, bottom plate; 11, height limiting plate; 12, circular blade; 13, long rod; 14, positioning sheet; 15, rotating wheel; 16, handle; 17, winding rod; 18, vertical plate; 19, spring; 20, handle; 21, rotating plate; 22, jacking 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-shaped hole. DETAILED DESCRIPTION

[0037] It should be noted that the embodiments in the application and the features in the embodiments can be combined with each other without conflict.

[0038] In the description of the application, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. In addition, the terms "first", "second" and the like are only for the purpose of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" and the like can explicitly or implicitly include one or more of the features. In the description of the application, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0039] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0040] In order to clearly illustrate the technical features of the scheme, the scheme will be described below through specific embodiments.

[0041] Referring to Figures 1-6 A small portable cutting device, comprising a chassis 1, a cutting machine 2 is fixedly installed on the chassis 1, the cutting machine 2 comprises a machine body and a cutting blade group, the cutting blade group is installed at the output shaft end of the cutting machine 2 and at one side of the front end of the chassis 1, the cutting blade group comprises a mounting shaft, a plurality of sets of circular blades 12 are arranged on the mounting shaft, and the mounting shaft is installed on the output end of the motor of the cutting machine 2;

[0042] A roller 4 is arranged on the lower part of the chassis 1 close to the rear end through a support, and a cutting depth adjusting mechanism is arranged on the front end of the chassis 1, the cutting depth adjusting mechanism comprises a support rod 6 arranged on the side surface of the chassis 1, a limiting round rod 8 coaxial with the mounting shaft is arranged on the support rod 6, an auxiliary round rod coaxial with the limiting round rod 8 is arranged on the other side surface of the chassis 1, a door-shaped frame 3 is slidingly arranged on the periphery of 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] A sliding groove 9 is arranged on each of the two vertical side plates of the door-shaped frame 3, the limiting round rod 8 and the auxiliary round rod are slidingly arranged in the corresponding sliding groove 9, and a bottom plate 10 is arranged at the lower end of each of the two vertical side plates, a pair of rolling wheels is arranged on the lower side surface of each of the two bottom plates 10;

[0044] A motor 5 is arranged on the vertical side plate close to the limiting round rod 8 through a support plate, a lead screw 7 is arranged on the output end of the motor 5, the lower end of the lead screw 7 is rotatably arranged on the corresponding bottom plate 10, a lead screw sliding block is arranged on the periphery of the lead screw 7, and a height limiting plate 11 is arranged on the lead screw sliding block, the height limiting plate 11 is slidingly arranged in the corresponding sliding groove 9;

[0045] A scale cooperating with the height limiting plate 11 is arranged on the outer side surface of the corresponding vertical side plate, the radius of the circular blade 12 is subtracted from the radius of the mounting shaft, and then the distance from the height limiting plate 11 to the ground is subtracted to obtain the cutting depth, the height of the height limiting plate 11 can be adjusted through the cooperation of the motor 5 and the lead screw 7, so as to adjust the cutting depth, and due to the limitation of the height limiting plate 11, the cutting depth of the circular blade 12 will remain consistent.

[0046] The vertical plate 18 is provided on the height limiting plate 11, and a rectangular plate 23 is slidingly arranged on the vertical plate 18. The rectangular plate 23 is provided with an inclined surface near the upper end of the center of the corresponding sliding groove 9, and the inclined surface is matched with the limiting round rod 8. The distance between the lower side of the rectangular plate 23 and the upper side of the height limiting plate 11 is matched with the diameter of the limiting round rod 8, that is, the limiting round rod 8 can be clamped between the rectangular plate 23 and the height limiting plate 11.

[0047] One end of the rectangular plate 23 away from the inclined surface is provided with a handle 20. The outer periphery of the rectangular plate 23 between the handle 20 and the vertical plate 18 is provided with a spring 19. 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 is pressed on the inclined surface after sliding downward, the rectangular plate 23 will be pushed outward to overcome the force of the spring 19, and then be clamped between the rectangular plate 23 and the height limiting plate 11, so as to keep the position of the cutting piece group, facilitate stable cutting, and the locking of the rectangular plate 23 to the limiting round rod 8 can be released by pulling the handle 20.

[0048] The center of the handle 20 is provided with a rotating plate 21, and the rotating plate 21 is provided with a top rod 22. The vertical plate 18 is provided with a through hole matched with the top rod 22. The top rod 22 is arranged in the through hole. When the handle 20 is pulled backward, the top rod 22 is separated from the through hole. At this time, the rectangular plate 23 will not be separated from the vertical plate 18. Then, the rotating plate 21 is rotated. Under the action of the spring 19, the top rod 22 is pressed on the side surface of the vertical plate 18, so as to keep the state of the rectangular plate 23, facilitate the upward sliding of the limiting round rod 8, and finally the handle 20 is pulled again, and the top rod 22 is inserted into the through hole again, so that the rectangular plate 23 is reset.

[0049] The mounting shaft includes a middle thick shaft and thin shafts 25 arranged at both ends of the thick shaft. The outer surface of the thick shaft is provided with external splines 28. The circular blades 12 are provided in three groups. 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 slidingly arranged on both sides of the fixed circular blades 12 through the center arranged internal splines 32.

[0050] The outer periphery of the thin shaft 25 on both sides is provided with a nut 24 through a threaded structure. The opposite inner side ends of the two nuts 24 are rotationally provided with an inner sleeve 29. The inner sleeve 29 is slidingly arranged on the outer periphery of the thick shaft through the arranged internal splines two 30 matched with the external splines 28.

[0051] The outer periphery of the inner sleeve 29 is rotationally provided with an outer sleeve 26 through the arranged annular groove. The outer sleeve 26 is provided with a pair of L-shaped plates 31 on the inner side surface facing the circular blades 12. The corresponding circular blades 12 are provided with a plug hole 33 matched with the L-shaped plate 31. The plug hole 33 is provided with an arc-shaped hole 34 matched with the horizontal plate of the L-shaped plate 31.

[0052] The outer sleeve 26 is provided with locking bolts on the outer side for fixing the outer sleeve 26 on the inner sleeve 29, when the L-shaped plate 31 is inserted into the insertion hole 33, the outer sleeve 26 is rotated, the horizontal plate of the L-shaped plate 31 is rotated along the arc-shaped hole 34, at this time, the vertical plate of the L-shaped plate 31 is attached to the side of the circular blade 12, then the outer sleeve 26 is fixed by the locking bolts, then the distance between the sliding circular blade 12 and the fixed circular blade 12 is adjusted by rotating the nut 24, so as to realize the setting of the cutting width.

[0053] The distance between the vertical plate of the L-shaped plate 31 and the inner sleeve 29 is matched with the thickness of the circular blade 12, that is, after the outer sleeve 26 is rotated, the circular blade 12 is just clamped between the vertical plate of the L-shaped plate 31 and the edge of the inner sleeve 29, and cannot move, so as to ensure the cutting stability.

[0054] The front end of the base frame 1 is provided with a mounting groove 27, a circular shaft is arranged in the mounting groove 27, a long rod 13 is rotatably arranged around the circular shaft, a positioning piece 14 is arranged 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 for calibrating the cutting position.

[0055] The circular shafts on both sides of the long rod 13 are each provided with a torsion spring, 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] The front lower end of the positioning piece 14 is provided with a pair of rotating wheels 15 through rotating shafts, the rotating wheels 15 are arranged on both sides of the positioning piece 14, the positioning piece 14 is initially inclined downward, when the cutting piece group is pressed to the ground, the rotating wheels 15 are abutted on the ground, so that the adjustment of the positioning piece 14 under different cutting depths is avoided, if the positioning piece 14 is not adjusted, the positioning piece 14 may interfere with the ground, and the structure provided in the embodiment can ensure that the positioning piece 14 always maintains a close distance from the ground under various cutting depth conditions, so as to facilitate the operator to align the positioning piece 14 with the joint line.

[0057] The rear end of the base frame 1 is provided with a handle 16, and the handle 16 is provided with a wire winding rod 17, the wire winding rod 17 is used for winding the wire of the cutting machine 2.

[0058] The cutting piece group is further provided with a protective shell 23.

[0059] The use method is as follows:

[0060] A1, according to the specification requirements, clean the surface of the base layer of sundries. Ensure that the concrete surface of the joint position needs to be clean, and ensure that the joint device runs smoothly without obstacles.

[0061] A2, according to the drawing and specification requirements, carry out the position of the split seam layout. The cutting seam position is according to the layout ink bucket to pop line to the construction base surface, form the cutting seam line;

[0062] A3, according to the depth to be cut, adjust the height of the height limiting plate 11 through the motor 5, according to the cutting seam width, adjust the distance between the circular blades 12 by rotating the nut 24, ensure that the distance between the two outer circular blades 12 and the middle fixed circular blade 12 is equal, which can be calibrated by a feeler gauge;

[0063] A4, turn on the power, start the cutting machine 2 and wind the excess wire on the winding frame, then lift the handle 16, so that the cutting blade group moves down, and then cut, ensure that the positioning piece 14 is aligned with the cutting seam line during cutting.

[0064] The technical features not described in the application can be realized by or using the prior art, which will not be repeated here. Of course, the above description is not a limitation of the application, and the application is not limited to the above examples. Changes, modifications, additions or substitutions made by ordinary skilled in the art within the scope of the application should also be within the protection scope of the application.

Claims

1. A small portable slitting device characterized by, The utility model provides cutting machine, including chassis (1), cutting machine (2) are fixedly installed on chassis (1), cutting machine (2) include machine body and cutting piece group, cutting piece group is installed at the output shaft end of cutting machine (2) and is at the one side of chassis (1) front end, and cutting piece group includes installation shaft, and a plurality of sets of circular blade (12) are arranged on installation shaft, The lower part of chassis (1) is provided with a roller (4) through a support near the rear end, and the front end of chassis (1) is provided with a cutting depth adjusting mechanism, which comprises a support rod (6) arranged on the side surface of chassis (1), a limiting round rod (8) coaxial with the installation shaft is arranged on the support rod (6), an auxiliary round rod coaxial with the limiting round rod (8) is arranged on the other side surface of chassis (1), a door-shaped frame (3) is slidably arranged on the periphery of the limiting round rod (8) and the auxiliary round rod, and a height limiting plate (11) matched with the limiting round rod (8) is arranged on the door-shaped frame (3). A sliding groove (9) is arranged on the vertical side plate on both sides of the door-shaped frame (3), the limiting round rod (8) and the auxiliary round rod are slidably arranged in the sliding groove (9) on the corresponding side, and a bottom plate (10) is arranged at the lower end of the vertical side plate on both sides. A motor (5) is arranged on the vertical side plate near the limiting round rod (8) through a support plate, a lead screw (7) is arranged at the output end of the motor (5), the lower end of the lead screw (7) is rotatably arranged on the corresponding side of the bottom plate (10), a lead screw sliding block is arranged on the periphery of the lead screw (7), the height limiting plate (11) is arranged on the lead screw sliding block, and the height limiting plate (11) is slidably arranged in the sliding groove (9) on the corresponding side. A scale matched with the height limiting plate (11) is arranged on the outer side surface of the vertical side plate on the corresponding side. A vertical plate (18) is arranged on the height limiting plate (11), a rectangular plate (23) is slidably arranged on the vertical plate (18), an inclined surface matched with the limiting round rod (8) is arranged on the upper end of the rectangular plate (23) near the center of the corresponding sliding groove (9), and the distance between the lower side surface of the rectangular plate (23) and the upper side surface of the height limiting plate (11) is matched with the diameter of the limiting round rod (8). A handle (20) is arranged at one end of the rectangular plate (23) away from the inclined surface, a spring (19) is arranged 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).

2. The compact portable slitting device of claim 1, wherein, A rotating plate (21) is arranged at the center of the handle (20), a top rod (22) is arranged on the rotating plate (21), a through hole matched with the top rod (22) is arranged on the vertical plate (18), and the top rod (22) is arranged in the through hole.

3. The compact portable slitting device of claim 1, wherein, The mounting shaft comprises a middle thick shaft and thin shafts (25) arranged at both ends of the thick shaft, the outer surface of the thick shaft is provided with external splines (28), the circular blades (12) are provided with three groups, one group of circular blades (12) is fixed at the middle of the thick shaft, and the other two groups of circular blades (12) are respectively arranged on both sides of the fixed circular blade (12) through the centrally arranged internal spline one (32); The outer periphery of the thin shaft (25) on both sides is provided with a nut (24) through a threaded structure, the opposite inner side end of the nut (24) on both sides is rotatably provided with an inner sleeve (29), and the inner sleeve (29) is slidably arranged on the outer periphery of the thick shaft through the arranged internal spline two (30) matched with the external spline (28); The outer periphery of the inner sleeve (29) is rotatably provided with an outer sleeve (26) through the arranged annular groove, the outer sleeve (26) is provided with a pair of L-shaped plates (31) on the inner side surface facing the circular blade (12), and the corresponding circular blade (12) is provided with a jack (33) matched with the L-shaped plate (31), and the jack (33) is provided with an arc-shaped hole (34) matched with the horizontal plate of the L-shaped plate (31) on one side. The outer side surface of the outer sleeve (26) is provided with a locking bolt for fixing the outer sleeve (26) on the inner sleeve (29).

4. The small portable slitting device of claim 3, wherein, The distance between the vertical plate of the L-shaped plate (31) and the inner sleeve (29) is matched with the thickness of the circular blade (12).

5. The compact portable slitting device of claim 3, wherein, The front end of the chassis (1) is provided with a mounting groove (27), the mounting groove (27) is provided with a circular shaft, the outer periphery of the circular shaft is rotatably provided with a long rod (13), the free end of the long rod (13) is provided with a positioning piece (14), and the positioning piece (14) is aligned with the fixed circular blade (12).

6. The small portable slitting device of claim 5, wherein, The outer periphery of the circular shaft on both sides of the long rod (13) is provided with a torsion spring, 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).

7. The small portable slitting device of claim 6, wherein, The front side lower end of the positioning piece (14) is provided with a pair of rotating wheels (15) through a rotating shaft, and the rotating wheels (15) are respectively arranged on both sides of the positioning piece (14).

8. The compact portable slitting device of claim 1, wherein, The rear end of the chassis (1) is provided with a handle (16), and the handle (16) is provided with a winding rod (17); The cutting piece group is also provided with a protective shell.

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