CN109853215B

CN109853215B - Cloth tailoring equipment

Info

Publication number: CN109853215B
Application number: CN201910223755.0A
Authority: CN
Inventors: 余平晓
Original assignee: Jiangxi Juxian Chemical Fiber Co ltd
Current assignee: Jiangxi Huasheng Plastic Industry Co ltd
Priority date: 2019-03-22
Filing date: 2019-03-22
Publication date: 2020-12-08
Anticipated expiration: 2039-03-22
Also published as: CN109853215A

Abstract

The invention discloses a cloth cutting device, which comprises a cutting box fixedly arranged on the ground, wherein a cutting cavity is fixedly arranged in the cutting box, a winding cavity positioned in the cutting box is fixedly arranged at the right end of the cutting cavity, cloth conveying assemblies are fixedly arranged in the cutting cavity and the winding cavity, the cloth is conveyed to a processed end from an unprocessed end through device transmission by the cloth conveying assemblies, belt conveying cavities positioned in the cutting box are symmetrically arranged at the left end and the right end of the cutting cavity, the cloth cutting device is simple in structure and convenient to operate, a cutting knife is driven to move up and down through friction transmission, the left and the right movement of the cutting knife are controlled, the cutting knife can cut the cloth in a plane, a pressure roller is driven to extrude the cloth in the cutting process, so that the cloth cannot be displaced in the cutting process, and the pressure roller and the cutting knife cancel the abutting against the cloth through a plurality of rows of linkage motions after the cutting is finished, the cloth to be cut can conveniently reach the cutting position.

Description

Cloth tailoring equipment

Technical Field

The invention relates to the field of cutting, in particular to a cloth cutting device.

Background

The automatic cutting of cloth generally uses the commodity smooth clothing cutting China of the clothing industry, along with the continuous improvement of the aesthetic requirements of society progress, the manufacturing requirements of clothing are higher and higher, common clothing is easy to displace under the cutting of the existing cutting machine, so that the quality of the clothing is not qualified or the precision is too low, the wearing comfort and the attractiveness of the clothing are affected, and the pressurizing assembly is additionally arranged in the cutting process of the equipment, so that the problems are effectively solved.

Disclosure of Invention

The invention aims to provide a cloth cutting device which is used for overcoming the defects in the prior art.

The cloth cutting equipment comprises a cutting box fixedly arranged on the ground, wherein a cutting cavity is fixedly arranged in the cutting box, a winding cavity positioned in the cutting box is fixedly arranged at the right end of the cutting cavity, cloth conveying assemblies are fixedly arranged in the cutting cavity and the winding cavity, the cloth is conveyed to a processed end from an unprocessed end through equipment transmission by the cloth conveying assemblies, belt transmission cavities positioned in the cutting box are symmetrically arranged at the left end and the right end of the cutting cavity, a spring cavity is fixedly arranged at the upper end of the belt transmission cavity, cloth pressing assemblies are fixedly arranged in the belt transmission cavity and the spring cavity, the cloth pressing assemblies press the cloth when the equipment cuts the cloth, the cloth is prevented from being displaced in the cutting process to influence the cutting precision, a motor thread block is fixedly arranged at the upper end of the belt transmission cavity, and a cutting assembly is fixedly arranged between the motor thread blocks which are symmetrical left and right, the cutting assembly cuts the cloth on the plane on the cloth, so that the stability of the equipment is effectively improved, the motor thread block is far away from the cutting cavity end, the switching assembly is fixedly arranged at the cutting cavity end, the switching assembly enables the cutting assembly not to be in contact with the cloth when the cloth is replaced, and meanwhile, the cloth pressing assembly is far away from the conveyor belt when the cloth is replaced, so that the operation convenience of the equipment is effectively improved. The cut waste cloth is wound around the processed end.

The cloth conveying assembly comprises a winding motor embedded in the right end wall of a winding cavity, the left end of an output shaft of the winding motor is fixedly provided with a rotating motor shaft which extends out of the winding cavity and is connected with the left end wall of a cutting cavity in a rotating matching manner, the upper end of the motor shaft is connected with the right end wall of the winding cavity in a rotating matching manner and is provided with a rotating shaft which is connected with the left end wall of the cutting cavity in a rotating matching manner, a motor wheel positioned in the winding cavity is fixedly arranged on the motor shaft, a shaft wheel positioned in the winding cavity is fixedly arranged on the rotating shaft, the shaft wheel is connected with the motor wheel through a synchronous belt, an upper winding wheel positioned in the cutting cavity is fixedly arranged on the rotating shaft, an active rotating shaft positioned in the cutting cavity is fixedly arranged on the motor shaft, and a driven shaft positioned below the active rotating shaft is connected between the left end wall and the, the cutting machine is characterized in that a conveying belt is connected between the driven shaft and the cutting cavity, and a lower winding wheel located at the lower end of the driven shaft is connected between the left end wall and the right end wall of the cutting cavity in a rotating fit mode.

The cloth pressing component comprises a switching motor embedded on the lower end wall of the belt transmission cavity, a switching shaft is fixedly arranged at the upper end of an output shaft of the driving wheel, a driving wheel positioned in the belt transmission cavity is fixedly arranged on the switching shaft, a driven wheel which is symmetrical in the front and back is arranged on the driving wheel and is close to the end of the cutting cavity and is connected with the lower end wall of the belt transmission cavity in a rotating fit manner, the driven wheel which is symmetrical in the front and back is connected with the driving wheel through a synchronous belt, an internal thread block is fixedly arranged on the upper end surface of the driven wheel, an external thread rod which is connected with the cutting box in a sliding fit manner is arranged in the internal thread block in a matching manner, the external thread rod stretches into the spring cavity in a sliding manner, a butting block is arranged between the front end wall and the rear end wall of the spring cavity in a sliding fit manner, a spring is connected with the end wall of the spring cavity, and an inner cavity which, and the end surface of the abutting block, which is close to the cutting cavity, is fixedly provided with a fixed rod, and the fixed rod is provided with abutting wheels which are abutted against the front end surface and the rear end surface of the conveyor belt in a rotating fit connection mode.

In a further technical scheme, the cutting assembly comprises a movable block in sliding fit connection with the end wall of the motor thread block, a sliding cavity is fixedly arranged at the end of the movable block close to the cutting cavity, a threaded extension shaft which extends upwards and rotatably extends out of the movable block is rotatably arranged on the lower end wall of the sliding cavity, the thread projecting shaft is connected with a motor thread block which is connected with the sliding cavity and the inner wall of the motor thread block in a sliding fit way in a threaded fit way, a fixing frame is fixedly arranged between the motor thread blocks which are symmetrical left and right, the fixed frame is fixedly provided with a fixed frame inner cavity with a downward opening, the right end wall of the fixed frame inner cavity is embedded with a transverse cutting motor positioned on a motor thread block at the right end, the left end of the output shaft of the transverse cutting motor is fixedly provided with a rotating shaft which is connected with the motor thread block at the left end in a rotating matching way, and the rotating shaft is in threaded fit connection with a threaded blade in sliding fit connection with the inner wall of the inner cavity of the fixed frame.

According to a further technical scheme, the switching assembly comprises a threaded slider cavity which is positioned at the end, far away from the cutting cavity, of the winding cavity, a meshing cavity which is positioned in the cutting box is fixedly arranged at the lower end of the threaded slider cavity, a wire cavity which is positioned in the cutting box is fixedly arranged at the end, far away from the cutting cavity, of the meshing cavity and is vertically symmetrical, the wire cavity which penetrates through the vertical symmetry and is rotated by the switching shaft is connected with the upper end wall of the threaded slider cavity in a rotating matching manner, a wire wheel which is positioned in the wire cavity is fixedly arranged on the switching shaft, a fixed pulley is arranged between the upper end wall and the lower end wall of the wire cavity in a rotating matching manner, a winding wire which bypasses the fixed pulley and is fixedly arranged on the upper end wall of the movable block is wound on the wire wheel, a threaded slider which is positioned in the threaded slider cavity is connected on the switching shaft in a threaded matching manner, the threaded slider, the output shaft of the cutting motor extends out of the threaded sliding block in a rotating mode and then extends into the meshing cavity, an upper friction wheel is fixedly arranged on the part, in the meshing cavity, of the output shaft of the cutting motor, and a lower friction wheel is fixedly arranged on the part, in the meshing cavity, of the threaded extension shaft in a rotating mode.

The invention has the beneficial effects that: the cloth cutting device is simple in structure and convenient to operate, the cutting knife is driven to move up and down through friction transmission, the cutting knife is controlled to move left and right at the same time, the cutting knife can cut cloth in a plane, the press wheel is driven to extrude the cloth in the cutting process, the cloth cannot be displaced in the cutting process, after the cutting is finished, the press wheel and the cutting knife are cancelled to be abutted against the cloth through a plurality of series of linkage motions, and the cloth to be cut can conveniently reach a cutting position.

It will be apparent to those skilled in the art that various modifications may be made to the above embodiments without departing from the general spirit and concept of the invention. All falling within the scope of protection of the present invention. The protection scheme of the invention is subject to the appended claims.

Drawings

FIG. 1 is a schematic view of the internal structure of a cloth cutting apparatus according to the present invention;

FIG. 2 is an enlarged schematic view of "A" in FIG. 1;

FIG. 3 is an enlarged schematic view of "B" in FIG. 1;

FIG. 4 is a schematic view in the direction "C-C" in FIG. 2;

fig. 5 is a schematic view in the direction "D-D" in fig. 2.

Detailed Description

The invention will now be described in detail with reference to fig. 1-5, for convenience of description, the following orientations will now be defined: the up, down, left, right, and front-back directions described below correspond to the up, down, left, right, and front-back directions in the projection relationship of fig. 1 itself.

Referring to fig. 1-5, a cloth cutting apparatus according to an embodiment of the present invention includes a cutting box 100 fixed on the ground, a cutting cavity 102 is fixed in the cutting box 100, a winding cavity 137 in the cutting box 100 is fixed at the right end of the cutting cavity 102, a cloth transfer component is fixed in the cutting cavity 102 and the winding cavity 137, the cloth transfer component enables the cloth to reach a processed end from an unprocessed end through apparatus transmission, belt transfer cavities 124 in the cutting box 100 are symmetrically arranged at the left and right ends of the cutting cavity 102, a spring cavity 146 is fixed at the upper end of the belt transfer cavity 124, cloth pressing components are fixed in the belt transfer cavity 124 and the spring cavity 146, the cloth pressing components press the cloth when the apparatus cuts the cloth, so as to prevent the cloth from being displaced during cutting, and affecting the precision of the cloth, a motor thread block 118 is fixed at the upper end of the belt transfer cavity 124, bilateral symmetry the motor screw thread piece 118 between set firmly cutting assembly, cutting assembly carries out the cutting on the plane to the cloth on the cloth, the effectual stability that has increased equipment, keeping away from of motor screw thread piece 118 tailor chamber 102 end and firmly be equipped with switching components, switching components makes when changing the cloth cutting assembly not with the cloth contact makes simultaneously cloth pressing assembly keeps away from when changing the cloth conveyer belt 104, the effectual operation convenience that has increased equipment.

Beneficially or exemplarily, the cloth conveying assembly comprises a winding motor 131 embedded in the right end wall of the winding cavity 137, a motor shaft 133 extending out of the winding cavity 137 and connected with the left end wall of the cutting cavity 102 in a rotating and matching manner is fixedly arranged at the left end of an output shaft of the winding motor 131, a rotating shaft 136 connected with the left end wall of the cutting cavity 102 in a rotating and matching manner is arranged at the upper end of the motor shaft 133 and connected with the right end wall of the winding cavity 137 in a rotating and matching manner, a motor wheel 134 positioned in the winding cavity 137 is fixedly arranged on the motor shaft 133, a shaft wheel 138 positioned in the winding cavity 137 is fixedly arranged on the rotating shaft 136, the shaft wheel 138 is connected with the motor wheel 134 through a synchronous belt 135, an upper winding wheel 103 positioned in the cutting cavity 102 is fixedly arranged on the rotating shaft 136, and a driving rotating shaft 132 positioned in the cutting cavity 102 is fixedly arranged on the motor shaft 133, a driven shaft 109 positioned below the driving rotating shaft 132 is connected between the left end wall and the right end wall of the cutting cavity 102 in a rotating fit manner, a conveying belt 104 is connected between the driven shaft 109 and the cutting cavity 102, and a lower winding wheel 105 positioned at the lower end of the driven shaft 109 is connected between the left end wall and the right end wall of the cutting cavity 102 in a rotating fit manner.

Beneficially or exemplarily, the cloth pressing assembly comprises a switching motor 160 embedded in the lower end wall of the belt transmission cavity 124, a switching shaft 121 is fixedly arranged at the upper end of an output shaft of the driving wheel 125, a driving wheel 125 positioned in the belt transmission cavity 124 is fixedly arranged on the switching shaft 121, a front and back symmetrical driven wheel 128 is arranged at the end of the driving wheel 125 close to the cutting cavity 102 and is in rotating fit connection with the lower end wall of the belt transmission cavity 124, the front and back symmetrical driven wheel 128 is connected with the driving wheel 125 through a synchronous belt 127, an inner thread block 107 is fixedly arranged on the upper end surface of the driven wheel 128, an outer thread rod 130 in sliding fit connection with the cutting box 100 is arranged in threaded fit connection with the inner thread block 107, the outer thread rod 130 is slidably inserted into the spring cavity 146, an abutting block 112 is arranged in sliding fit connection between the front and back end walls of the spring cavity 146, the end walls of the abutting block 112 and the spring cavity 146 are connected with a spring, an inner cavity 110 abutting against the external thread rod 130 is fixedly arranged in the abutting block 112, a fixing rod 147 is fixedly arranged on the end surface, close to the cutting cavity 102, of the abutting block 112, and an abutting wheel 106 abutting against the front end surface and the rear end surface of the conveyor belt 104 is arranged on the fixing rod 147 in a rotating matching connection mode.

Beneficially or exemplarily, the cutting assembly includes a movable block 120 connected with an end wall of the motor thread block 118 in a sliding fit manner, a sliding cavity 161 is fixedly arranged at the end of the movable block 120 close to the cutting cavity 102, a thread protruding shaft 119 extending upwards and rotatably protruding out of the movable block 120 is rotatably arranged at a lower end wall of the sliding cavity 161, a motor thread block 118 connected with inner walls of the sliding cavity 161 and the motor thread block 118 in a sliding fit manner is connected to the thread protruding shaft 119 in a threaded fit manner, a fixed frame 113 is fixedly arranged between the motor thread blocks 118 in bilateral symmetry, a fixed frame inner cavity 115 with a downward opening is fixedly arranged on the fixed frame 113, a transverse cutting motor 116 located on the motor thread block 118 at the right end is embedded in a right end wall of the fixed frame inner cavity 115, a rotating shaft 114 connected with the motor thread block 118 at the left end is fixedly arranged at the left end of an output shaft of the transverse cutting motor 116 in a rotating fit manner, the rotating shaft 114 is connected with a thread blade 163 in a sliding fit connection with the inner wall of the fixing frame inner cavity 115 through a thread fit.

Advantageously or exemplarily, the switching assembly comprises a threaded slider cavity 141 located at the end of the winding cavity 137 far away from the cutting cavity 102, a meshing cavity 143 located in the cutting box 100 is fixedly arranged at the lower end of the threaded slider cavity 141, a wire cavity 122 is fixedly arranged at the end of the meshing cavity 143 far away from the cutting cavity 102 in an up-down symmetrical manner, the switching shaft 121 rotatably penetrates through the wire cavity 122 in an up-down symmetrical manner and is connected with the upper end wall of the threaded slider cavity 141 in a rotating and matching manner, a wire wheel 123 located in the wire cavity 122 is fixedly arranged on the switching shaft 121, a fixed pulley 149 is arranged between the upper end wall and the lower end wall of the wire cavity 122 in a rotating and matching manner, a winding wire 164 which bypasses the fixed pulley 149 and is fixedly arranged on the upper end wall of the movable block 120 is arranged on the wire wheel 123 in a winding manner, a threaded slider 142 located in the threaded slider cavity 141 is connected on the switching shaft 121 in a threaded manner, and the threaded slider 142 is connected with the cutting, the upper end face of the threaded sliding block 142 is embedded with a cutting motor 140, the output shaft of the cutting motor 140 rotatably extends out of the threaded sliding block 142 and then extends into the meshing cavity 143, an upper friction wheel 144 is fixedly arranged on the part of the output shaft of the cutting motor 140 in the meshing cavity 143, the threaded extending shaft 119 rotatably extends into the meshing cavity 143, and a lower friction wheel 145 is fixedly arranged on the part of the threaded extending shaft 119 in the meshing cavity 143.

In the initial state, the transverse cutting motor 116, the winding motor 131, the cutting motor 140 and the switching motor 160 are in a stop working state, the thread blade 163 abuts against the conveyor belt 104, and the abutment wheel 106 abuts against the conveyor belt 104, so that the structure is located at the initial position in the initial state, and is adjusted in the subsequent work, and the working coordination of the equipment is effectively improved.

When the equipment is operated, the switching motor 160 is driven to rotate to drive the switching shaft 121 to rotate, the switching shaft 121 drives the driving wheel 125 to rotate, the synchronous belt 127 drives the driven wheel 128 engaged with the switching shaft to rotate to drive the internal thread block 107 to rotate, so that the external thread rod 130 in threaded fit connection with the internal thread block 107 moves downwards, under the action of the spring on the end face of the abutting block 112, the abutting block 112 is pulled towards the end wall direction of the spring cavity 146, the abutting wheel 106 is separated from abutting against the conveyor belt 104, meanwhile, the switching shaft 121 drives the reel 123 to rotate, so that the winding wire 164 is continuously wound on the reel 123, under the guiding action of the fixed pulley 149, the movable block 120 moves towards the front end, so that the thread blade 163 is separated from being engaged with the abutting wheel 106, and meanwhile, the switching shaft 121 drives the thread sliding block 142 to slide upwards, disengaging the upper friction wheel 144 from engagement with the lower friction wheel 145;

horizontally placing the cloth wound in the lower winding wheel 105 on the conveyor belt 104, winding the end of the cloth far away from the lower winding wheel 105 on the upper winding wheel 103, driving the switching motor 160 to reversely rotate, returning the device to the initial position, driving the cutting motor 140 to operate, driving the cutting motor 140 to drive the upper friction wheel 144 to rotate, driving the lower friction wheel 145 to rotate by the upper friction wheel 144, driving the thread extending shaft 119 to rotate by the lower friction wheel 145, driving the motor thread block 118 to slide up and down in the sliding cavity 161, driving the fixed frame inner cavity 115 to slide up and down on the conveyor belt 104, driving the cross cutting motor 116 to operate, driving the thread blade 163 to slide left and right on the front end face of the conveyor belt 104, making the thread blade 163 freely cut the cloth on the front end face of the conveyor belt 104, and after a part of cutting is completed, the switching motor 160 works again to make the abutting wheel 106 and the thread blade 163 cancel and abut against the conveyor belt 104, the upper friction wheel 144 and the lower friction wheel 145 are not meshed any more, the winding motor 131 is driven to work to drive the motor shaft 133 to rotate, the motor shaft 133 drives the driving rotating shaft 132 to rotate, the conveyor belt 104 meshed with the driving rotating shaft 132 is driven to rotate, meanwhile, the motor shaft 133 drives the motor shaft 134 to rotate, the shaft wheel 138 is driven to rotate through the synchronous belt 135, the upper winding wheel 103 is driven to rotate through the rotating shaft 136, and cut cloth is wound on the upper winding wheel 103.

Claims

1. A cloth cutting device comprises a cutting box fixedly arranged on the ground, wherein a cutting cavity is fixedly arranged in the cutting box, a winding cavity positioned in the cutting box is fixedly arranged at the right end of the cutting cavity, a cloth transferring component is fixedly arranged in the cutting cavity and the winding cavity, the cloth is enabled to reach a processed end from an unprocessed end through device transmission by the cloth transferring component, belt transmission cavities positioned in the cutting box are symmetrically arranged at the left end and the right end of the cutting cavity, a spring cavity is fixedly arranged at the upper end of the belt transmission cavity, a cloth pressing component is fixedly arranged in the belt transmission cavity and the spring cavity, the cloth is pressed by the cloth pressing component when the cloth is cut by the device, the cutting precision is prevented from being influenced by displacement in the cloth cutting process, a motor thread block is fixedly arranged at the upper end of the belt transmission cavity, a cutting component is fixedly arranged between the motor thread blocks in bilateral symmetry, and performs planar cutting on the cloth by the cutting component, the stability of the equipment is effectively improved, the end, far away from the cutting cavity, of the motor threaded block is fixedly provided with the switching component, the switching component enables the cutting component not to be in contact with the cloth when the cloth is replaced, and meanwhile, the cloth pressing component is far away from the conveyor belt when the cloth is replaced, so that the operation convenience of the equipment is effectively improved; the cloth conveying assembly comprises a winding motor embedded in the right end wall of the winding cavity, the left end of an output shaft of the winding motor is fixedly provided with a rotating motor shaft which extends out of the winding cavity and is connected with the left end wall of the cutting cavity in a rotating matching manner, the upper end of the motor shaft and the right end wall of the winding cavity are fixedly connected with a rotating shaft which is connected with the left end wall of the cutting cavity in a rotating matching manner, a motor wheel positioned in the winding cavity is fixedly arranged on the motor shaft, a shaft wheel positioned in the winding cavity is fixedly arranged on the rotating shaft, the shaft wheel is connected with the motor wheel through a synchronous belt, an upper winding wheel positioned in the cutting cavity is fixedly arranged on the rotating shaft, an active rotating shaft positioned in the cutting cavity is fixedly arranged on the motor shaft, and a driven shaft positioned below the active rotating shaft is connected between the left end wall and the right end wall of the cutting cavity in a, a conveying belt is connected between the driven shaft and the cutting cavity, and a lower winding wheel positioned at the lower end of the driven shaft is connected between the left end wall and the right end wall of the cutting cavity in a rotating fit manner; the cloth pressing component comprises a switching motor embedded in the lower end wall of the belt transmission cavity, a switching shaft is fixedly arranged at the upper end of an output shaft of the driving wheel, a driving wheel positioned in the belt transmission cavity is fixedly arranged on the switching shaft, a driven wheel which is close to the end of the cutting cavity and is connected with the lower end wall of the belt transmission cavity in a rotating fit manner is arranged on the driving wheel, the driven wheel is symmetrical in the front-back direction, the driven wheel is connected with the driving wheel through a synchronous belt, an internal thread block is fixedly arranged on the upper end face of the driven wheel, an external thread rod which is connected with the cutting box in a sliding fit manner is arranged in the internal thread block in a matching manner, the external thread rod stretches into the spring cavity in a sliding manner, a butting block is arranged between the front end wall and the rear end wall of the spring cavity in a sliding fit manner, a spring is connected with the end wall of the spring cavity, and an inner, the end surface of the abutting block close to the cutting cavity is fixedly provided with a fixed rod, and the fixed rod is provided with abutting wheels which abut against the front end surface and the rear end surface of the conveyor belt in a rotating fit connection manner; the cutting component comprises a movable block which is connected with the end wall of the motor thread block in a sliding fit manner, a sliding cavity is fixedly arranged at the end of the movable block close to the cutting cavity, the lower end wall of the sliding cavity is rotatably provided with a threaded extension shaft which extends upwards and rotatably and extends out of the movable block, the thread projecting shaft is connected with a motor thread block which is connected with the inner wall of the sliding cavity in a sliding fit way in a thread fit way, a fixing frame is fixedly arranged between the motor thread blocks which are symmetrical left and right, the fixed frame is fixedly provided with a fixed frame inner cavity with a downward opening, the right end wall of the fixed frame inner cavity is embedded with a transverse cutting motor positioned on a motor thread block at the right end, the left end of the output shaft of the transverse cutting motor is fixedly provided with a rotating shaft which is connected with the motor thread block at the left end in a rotating matching way, the rotating shaft is in threaded fit connection with a threaded blade in sliding fit connection with the inner wall of the inner cavity of the fixed frame; the switching assembly comprises a threaded slider cavity which is positioned at the end of the winding cavity far away from the cutting cavity, the lower end of the threaded slider cavity is fixedly provided with a meshing cavity positioned in the cutting box, the end of the meshing cavity far away from the cutting cavity is symmetrically and vertically fixedly provided with a wire cavity, the switching shaft is rotatably connected with the wire cavity in a way of penetrating through the wire cavity in an up-down symmetry way and is in rotating fit with the upper end wall of the threaded slider cavity, a wire wheel positioned in the wire cavity is fixedly arranged on the switching shaft, a fixed pulley is arranged between the upper end wall and the lower end wall of the wire cavity in a way of rotating fit connection, a winding wire which bypasses the fixed pulley and is fixedly arranged on the upper end wall of the movable block is wound on the wire wheel, a threaded slider positioned in the threaded slider cavity is in a way of threaded fit connection on the switching shaft, the threaded slider is connected with the cutting box in a way of, the output shaft of the cutting motor extends out of the threaded sliding block in a rotating mode and then extends into the meshing cavity, an upper friction wheel is fixedly arranged on the part, in the meshing cavity, of the output shaft of the cutting motor, and a lower friction wheel is fixedly arranged on the part, in the meshing cavity, of the threaded extension shaft in a rotating mode.