CN112722715A

CN112722715A - Machining is with defeated material mechanism convenient to speed governing in grades

Info

Publication number: CN112722715A
Application number: CN202011523275.5A
Authority: CN
Inventors: 梁景英
Original assignee: Individual
Current assignee: Dongying Hengcheng Machinery Co ltd
Priority date: 2020-12-21
Filing date: 2020-12-21
Publication date: 2021-04-30
Anticipated expiration: 2040-12-21
Also published as: CN112722715B

Abstract

The invention provides a feeding mechanism for machining, which is convenient for grading speed regulation and comprises a conveying structure; the lower end of the conveying structure is provided with a sliding structure; the lower end of the sliding structure is provided with a power structure; adjusting structures are arranged at two ends of the power structure; conveying structure is still including the mounting bracket, the sliding frame, the guide roll, the conveyer belt, the slide bar, the guide roll is installed to mounting bracket upper end position, and be equipped with the conveyer belt on the guide roll, the lower extreme fixed mounting of conveyer belt has two slide bars, sliding frame slidable mounting is on the slide bar, the guide roll is provided with five groups, the same guide roll of installing on the sliding frame, the conveyer belt all sets up with every guide roll is tangent, the sliding frame extends the conveyer belt downwardly to the high position of three guide roll, the sliding frame is slidable mounting, make the sliding frame can be under the condition that drives the conveyer belt motion, can also carry out the slip about the sliding frame, thereby realize that the sliding frame of sliding motion does not influence the motion of conveyer belt.

Description

Machining is with defeated material mechanism convenient to speed governing in grades

Technical Field

The invention belongs to the technical field of conveying equipment, and particularly relates to a feeding mechanism for machining, which is convenient for grading speed regulation.

Background

A conveying device is a machine which is driven by friction to convey materials in a continuous mode. By using the material conveying device, the materials can be conveyed on a certain conveying line from an initial feeding point to a final discharging point to form a material conveying flow path. The conveying device can be used for conveying both broken materials and finished articles. Besides pure material conveying, the device can also be matched with the requirements of the technological process in the production flow of each industrial enterprise to form a rhythmic line production conveying line. The conveying equipment is widely applied to various modern industrial enterprises.

Application No.: the invention discloses a speed-adjustable conveyor belt for kitchen waste treatment equipment, which comprises a conveyor belt main body arranged between a crusher discharge port and a roller screen feed port, wherein a driving motor in the conveyor belt main body is a speed-adjustable motor, the speed-adjustable motor is connected with an output end of a speed regulator, an input end of the speed regulator is connected with a mains supply, a forward and reverse rotation control end of the speed regulator comprises a CW end, a CCW end and a COM end, the CW end and the CCW end are respectively connected with the COM end through a circuit provided with a relay, and a control end of the relay is connected with a PLC. The invention has the beneficial effects that: the speed regulator can be controlled by the PLC controller, the speed regulating motor can be indirectly controlled, the conveyor belt can run forward and backward at high speed, the screening rate can be improved, and the device is clean, debugged and convenient to use.

Based on the above, the existing transmission equipment mostly uses the motor and the frequency converter to control the speed, the frequency converter can generate system disorder when in use, the cost of the frequency converter is high, and unnecessary loss is caused, and the existing mechanical speed regulation equipment does not have a grading effect and cannot meet the corresponding speed regulation requirement.

Therefore, in view of the above, research and improvement are made on the existing structure and defects, and a feeding mechanism for machining, which facilitates step speed regulation, is provided in order to achieve the purpose of higher practical value.

Disclosure of Invention

In order to solve the technical problems, the invention provides a feeding mechanism for machining, which is convenient for stepped speed regulation and aims to solve the problems that the existing conveying equipment mostly uses a motor and a frequency converter to control the speed, the frequency converter is disordered when in use, the cost of the frequency converter is high, unnecessary loss is caused, and the existing mechanical speed regulation equipment does not have a stepped effect and cannot meet the corresponding speed regulation requirement.

The invention relates to a feeding mechanism for machining, which facilitates graded speed regulation and has the purpose and the effect achieved by the following specific technical means:

a feeding mechanism for machining convenient for grading speed regulation comprises a conveying structure; the lower end of the conveying structure is provided with a sliding structure; the lower end of the sliding structure is provided with a power structure; adjusting structures are arranged at two ends of the power structure; the conveying structure further comprises a mounting frame, a sliding frame, a guide roller, a conveying belt and sliding rods, the guide roller is mounted at the upper end of the mounting frame, the conveying belt is arranged on the guide roller, the two sliding rods are fixedly mounted at the lower end of the conveying belt, the sliding frame is slidably mounted on the sliding rods, and the guide roller is provided with five groups.

Furthermore, the sliding structure further comprises an auxiliary plate, an extension plate, a mounting groove and a sliding block, the auxiliary plate is mounted at the lower end of the conveyor belt, the mounting groove is formed in the auxiliary plate, the downward extension plate is mounted in the middle of the sliding frame, the sliding block is fixedly mounted at the bottom of the extension plate, and the sliding block is slidably mounted in the mounting groove.

Further, sliding construction is still including the chucking piece, has seted up three inner groovies of group on the mounting groove inner wall, and the chucking piece that has the spring is all installed to the sliding block front and back end, and the chucking piece can block each other with the inner groovy.

Furthermore, the sliding structure further comprises a sliding plate, protruding heads and sliding grooves, three groups of sliding grooves are formed in the auxiliary plate, the protruding heads are arranged at the upper end of the extension plate, the sliding plate is slidably mounted in the three groups of sliding grooves, the sliding plate is fixed to the extension plate through the protruding blocks, and a handle is arranged at the outer end of the sliding plate.

Furthermore, adjust the structure still including side board, side slide, dead lever, sideslip groove, the back end position at the accessory plate is fixed to the side board, and slidable mounting has the side slide on the side board, has seted up vertical spout on the side slide, hugs closely and installs the dead lever in the side slide, and dead lever outer end slidable mounting is in vertical spout, and the inboard slidable mounting of dead lever is in the sideslip groove of twice slope.

Furthermore, the adjusting structure further comprises a connecting plate and a screw rod, wherein the connecting plate is used for connecting and fixing the side sliding plates at the left end and the right end, and the screw rod is arranged in the middle of the connecting plate.

Further, power structure is still including cone pulley, fixed frame, innerspring, and fixed frame both ends and dead lever reciprocal anchorage, and three groups of cone pulleys are installed to the fixed frame internal rotation, and the root position of every group cone pulley all adds and is equipped with the innerspring, and the cone pulley size of three groups is different structures, and the axis of every group cone pulley all corresponds with the inner groovy each other simultaneously.

Furthermore, the power structure still includes belt, clamp plate, screw rod, sliding shaft, and the belt is installed in three group's cone pulley root outer ends, and has a clamp plate at middle cone pulley position slidable mounting, installs a screw rod on the clamp plate, and the clamp plate is whole to be the arc structure, and the sliding shaft is installed respectively at the both ends of clamp plate.

Compared with the prior art, the invention has the following beneficial effects:

the setting of conveying structure installs the guide roll on the sliding frame equally, and the conveyer belt all sets up with every guide roll is tangent, and the sliding frame is the slidable mounting with the high position of conveyer belt downwardly extending to three guide roll for the sliding frame can be under the condition that drives the conveyer belt motion, can also carry out the slip about the sliding frame, thereby realizes that the sliding frame of sliding motion does not influence the motion of conveyer belt.

Sliding construction's setting, set up three inner groovies of group with the inside of mounting groove, when the sliding block slides corresponding inner groove position, the chucking piece can block in the inner groovy under the effect of spring, let the sliding frame have the fixed effect of three-section position at the slip in-process, sliding plate slidable mounting is in the sliding tray, also fix on the extension board, make the sliding plate can drive the sliding frame motion when sliding motion, and install the handle on the sliding plate can more convenient control.

The arrangement of the power structure and the step speed regulation are divided into three groups of different conical wheels, the center of each group of conical wheels corresponds to the inner groove, so that the sliding frame can correspond to the corresponding conical wheel after being positioned, the three groups of conical wheels are arranged from small to large once, the speed regulation of different levels is realized when the sliding frame is combined with the corresponding conical wheel, because the conical wheels and the guide rollers on the sliding frame are in tangential friction transmission, the conical wheels with the inner springs can better clamp and transmit power, the fixed frames with two ends fixed with the fixed rods mutually can allow the moving side sliding plates to drive the fixed frames to move, the slope of the side sliding grooves is the same as that of the conical wheels, the speed regulation of the whole transmission belt is realized when the fixed frames are adjusted to move, and the belt can better rub against the conical wheels, the pressing plate is arranged at the position of the conical wheel in the middle, two sliding shafts are arranged at two ends of the pressing plate, the belt can be better fixed on the conical wheel, and a good transmission effect on the conical wheel is achieved.

Drawings

Fig. 1 is a schematic structural view of the present invention.

Fig. 2 is a schematic view of the sliding structure of the present invention.

Fig. 3 is a schematic diagram of the power configuration of the present invention.

Fig. 4 is a schematic view of the screw structure of the present invention.

Fig. 5 is a schematic view of the sliding panel structure of the present invention.

Fig. 6 is a schematic view of the present invention at a part enlarged in fig. 2.

Fig. 7 is a schematic view of the present invention at a part B enlarged in fig. 3.

In the drawings, the corresponding relationship between the component names and the reference numbers is as follows:

1. a transfer structure; 101. a mounting frame; 102. a sliding frame; 103. a guide roller; 104. a conveyor belt; 105. a slide bar; 2. a sliding structure; 201. an auxiliary plate; 202. an extension plate; 203. a sliding plate; 204. a protruding head; 205. a sliding groove; 206. mounting grooves; 207. a slider; 208. a clamping block; 3. an adjustment structure; 301. a side panel; 302. a side slide plate; 303. fixing the rod; 304. a side chute; 305. a connecting plate; 306. a screw rod; 4. a power structure; 401. a conical wheel; 402. a fixing frame; 403. an inner spring; 404. a belt; 405. pressing a plate; 406. a screw; 407. a sliding shaft.

Detailed Description

The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

Example (b):

as shown in figures 1 to 7:

the invention provides a feeding mechanism for machining, which is convenient for grading speed regulation and comprises a conveying structure 1; the lower end of the conveying structure 1 is provided with a sliding structure 2; the lower end of the sliding structure 2 is provided with a power structure 4; the two ends of the power structure 4 are provided with the adjusting structures 3; the conveying structure 1 further comprises a mounting frame 101, a sliding frame 102, guide rollers 103, conveying belts 104 and sliding rods 105, the guide rollers 103 are mounted at the upper end of the mounting frame 101, the conveying belts 104 are arranged on the guide rollers 103, two sliding rods 105 are fixedly mounted at the lower ends of the conveying belts 104, the sliding frame 102 is slidably mounted on the sliding rods 105, five groups of guide rollers 103 are arranged, the guide rollers 103 are similarly mounted on the sliding frame 102, the conveying belts 104 are all arranged in a tangent mode with each guide roller 103, the sliding frame 102 extends the conveying belts 104 downwards to the height positions of the three guide rollers 103, the sliding frame 102 is slidably mounted, the sliding frame 102 can slide the sliding frame 102 left and right under the condition that the conveying belts 104 are driven to move, and therefore the sliding frame 102 achieving sliding motion does not influence the movement of the conveying belts 104.

The sliding structure 2 further includes an auxiliary plate 201, an extension plate 202, a mounting groove 206, and a sliding block 207, the auxiliary plate 201 is mounted at the lower end of the conveyor belt 104, the mounting groove 206 is formed in the auxiliary plate 201, the downward extension plate 202 is mounted in the middle of the sliding frame 102, the sliding block 207 is fixedly mounted at the bottom of the extension plate 202, the sliding block 207 is slidably mounted in the mounting groove 206, and the sliding block 207 is connected with the sliding frame 102 through the extension plate 202, so that the sliding frame 102 can perform stable sliding motion through the two sliding rods 105 and the sliding block 207 at the bottom.

Wherein, sliding structure 2 is still including chucking piece 208, three inner grooves of group have been seted up on the mounting groove 206 inner wall, the chucking piece 208 that has the spring is all installed to the sliding block 207 front and back end, chucking piece 208 can with the mutual block of inner groove, set up three inner grooves of group with the inside of mounting groove 206, when sliding block 207 slides corresponding inner groove position, chucking piece 208 can block in the inner groove under the effect of spring, let sliding frame 102 have the fixed effect of three-section position at the slip in-process.

The sliding structure 2 further comprises a sliding plate 203, protruding heads 204 and sliding grooves 205, three groups of sliding grooves 205 are formed in the auxiliary plate 201, the protruding heads 204 are arranged at the upper end of the extension plate 202, the sliding plate 203 is slidably mounted in the three groups of sliding grooves 205, the sliding plate 203 is fixed on the extension plate 202 through protruding blocks, a handle is arranged at the outer end of the sliding plate 203, the sliding plate 203 is slidably mounted in the sliding grooves 205 and is also fixed on the extension plate 202, the sliding plate 203 can drive the sliding frame 102 to move during sliding movement, and the handle mounted on the sliding plate 203 can be controlled more conveniently.

Wherein, it still includes side board 301 to adjust structure 3, side slide 302, dead lever 303, sideslip groove 304, side board 301 is fixed in the rear end position of accessory plate 201, slidable mounting has side slide 302 on side board 301, vertical spout has been seted up on the side slide 302, hug closely and install dead lever 303 in the side slide 302, dead lever 303 outer end slidable mounting is in vertical spout, the inner slidable mounting of dead lever 303 is in the sideslip groove 304 of twice slope, slidable mounting's side slide 302 is in the sliding motion in-process, can drive dead lever 303 and slide, because the inner of dead lever 303 is slidable mounting in the sideslip groove 304 of twice slope simultaneously, let the dead lever 303 of horizontal slip can be the motion of going up and down simultaneously.

The adjusting structure 3 further comprises a connecting plate 305 and a screw rod 306, the connecting plate 305 connects and fixes the side sliding plates 302 at the left end and the right end, the screw rod 306 is installed in the middle of the connecting plate 305, the side plates 301 and the side sliding plates 302 are both arranged into two symmetrical groups, the two groups of side sliding plates 302 are fixed through the connecting plate 305, and the screw rod 306 installed in the middle of the connecting plate 305 can drive the side sliding plates 302 to move stably.

Wherein, the power structure 4 further comprises a cone pulley 401, a fixed frame 402, an inner spring 403, two ends of the fixed frame 402 are mutually fixed with the fixed rod 303, three groups of cone pulleys 401 are rotatably installed in the fixed frame 402, the inner spring 403 is additionally installed at the root position of each group of cone pulleys 401, the sizes of the three groups of cone pulleys 401 are different structures, the middle shaft of each group of cone pulleys 401 corresponds to the inner groove, the step speed regulation is divided into three groups of different cone pulleys 401, the center of each group of cone pulleys 401 corresponds to the inner groove, thereby realizing that the sliding frame 102 can correspond to the corresponding cone pulley 401 after being positioned, the three groups of cone pulleys 401 are arranged from small to large once, realizing that the speed regulation of different levels is carried out when the sliding frame 102 is aligned with the corresponding cone pulley 401, because the guide rollers 103 on the sliding frame 102 and the cone pulleys are in tangential friction transmission, so that the conical wheel 401 with the internal spring 403 can be better clamped to transmit power.

Wherein, power structure 4 is still including belt 404, clamp plate 405, screw rod 406, sliding shaft 407, belt 404 is installed in three group's cone pulley 401 root outer ends, and there is a clamp plate 405 at middle cone pulley 401 position slidable mounting, install a screw rod 406 on the clamp plate 405, clamp plate 405 is whole to be the arc structure, sliding shaft 407 is installed respectively at the both ends of clamp plate 405, in order to let belt 404 and cone pulley 401 rub better, set up clamp plate 405 with the cone pulley 401 department of intermediate position, clamp plate 405 both ends have two sliding shaft 407, can be with better fixing on cone pulley 401 of belt 404, realize the good transmission effect to cone pulley 401.

The specific use mode and function of the embodiment are as follows:

in the invention, the guide rollers 103 are arranged on the sliding frame 102, the conveyor belt 104 is tangent to each group of guide rollers 103, the guide rollers 103 near the lower end position and the guide rollers 103 on the sliding frame 102 project and extend the conveyor belt 104 to the lower end by the height of three guide rollers 103, the sliding frame 102 is arranged in a sliding way, so that the sliding frame 102 can slide left and right under the condition of driving the conveyor belt 104 to move, a downward extension plate 202 is arranged at the middle position of the sliding structure 2, a sliding block 207 is fixedly arranged at the bottom of the extension plate 202, the sliding block 207 is arranged in the mounting groove 206 in a sliding way, the sliding block 207 is connected with the sliding frame 102 through the extension plate 202, so that the sliding frame 102 can stably slide with the sliding block 207 at the bottom through two sliding rods 105, the clamping blocks 208 with springs are arranged at the front and rear ends of the sliding block 207, and the clamping blocks 208 can be mutually clamped with the, three groups of inner grooves are arranged in the mounting groove 206, when the sliding block 207 slides to the corresponding inner groove position, the clamping block 208 is clamped in the inner groove under the action of a spring, so that the sliding frame 102 has the fixing effect of three sections of positions, the sliding plate 203 is arranged on the sliding groove 205 in a sliding manner and is also fixed on the extension plate 202, so that the sliding plate 203 drives the sliding frame 102 to move in the sliding movement, a handle arranged on the sliding plate 203 can be controlled more conveniently, the side sliding plate 302 in the sliding movement can drive the fixing rod 303 to slide, because the inner end of the fixing rod 303 is simultaneously arranged in two inclined side sliding grooves 304 in a sliding manner, the fixing rod 303 in the left-right sliding manner can move up and down simultaneously, the side sliding plate 301 and the side sliding plate 302 are both arranged at two symmetrical positions, and the side plate 305 fixing rod 303 passes through the two groups of side sliding plates 302, the screw 306 installed in the middle of the connecting plate 305 can drive the side sliding plate 302 to move, wherein the step speed regulation is composed of three groups of different conical wheels 401, the center of each group of conical wheels 401 corresponds to the inner groove, thereby realizing that the sliding frame 102 can correspond to each group of conical wheels 401, the three groups of conical wheels 401 are arranged from small to large, realizing the speed regulation of different levels when the sliding frame 102 is aligned with the corresponding conical wheels 401, because the conical wheels 401 and the guide rollers 103 on the sliding frame 102 are in tangential friction transmission, the conical wheels 401 with the inner springs 403 can better clamp and transmit power, the two ends of the conical wheels are fixed with the fixed frame 402 fixed with the fixed rod 303, thereby the moving side sliding plate 302 can drive the fixed frame 402 to move, the slopes of the side sliding grooves 304 and the conical wheels 401 are the same, and realizing the speed regulation when the fixed frame 402 moves, in order to better enable the belt 404 to rub the conical pulley 401, a pressing plate 405 is arranged at the conical pulley 401 at the middle position, two sliding shafts 407 are arranged at two ends of the pressing plate 405, the belt 404 can be better fixed on the conical pulley 401, and a good transmission effect on the conical pulley 401 is achieved. The sliding frame 102 is also provided with guide rollers 103, the conveyor belt 104 is arranged in a tangent manner with each guide roller 103, the sliding frame 102 extends the conveyor belt 104 downwards to the height positions of the three guide rollers 103, the sliding frame 102 is arranged in a sliding manner, so that the sliding frame 102 can slide left and right under the condition of driving the conveyor belt 104 to move, the sliding frame 102 in sliding movement does not influence the movement of the conveyor belt 104, the step speed regulation is divided into three groups of different conical wheels 401, the centers of the conical wheels 401 in each group correspond to the inner grooves, the sliding frame 102 can correspond to the corresponding conical wheels 401 after being positioned, the conical wheels 401 in the three groups are arranged once from small to large, the speed regulation of different levels is realized when the sliding frame 102 is aligned with the corresponding conical wheels 401, and because the conical wheels 401 and the guide rollers 103 on the sliding frame 102 are in tangent friction transmission, thereby cone pulley 401 with innerspring 403, chucking that can be better conveys power, both ends and the fixed frame 402 of dead lever 303 reciprocal anchorage, can let the side slide board 302 of motion drive fixed frame 402 and move, side spout 304 is the same with the inclination of cone pulley 401, make when adjusting fixed frame 402 and move, realized carrying the holistic speed adjustment of belt 104, in order to better let belt 404 and cone pulley 401 rub, set up clamp plate 405 with the cone pulley 401 department of intermediate position, clamp plate 405 both ends have two slip axles 407, can be with better fixing on cone pulley 401 of belt 404, realize the good transmission effect to cone pulley 401.

The embodiments of the present invention have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.

Claims

1. The utility model provides a machining is with defeated material mechanism convenient to hierarchical speed governing which characterized in that: comprising a conveying structure (1); the lower end of the conveying structure (1) is provided with a sliding structure (2); the lower end of the sliding structure (2) is provided with a power structure (4); adjusting structures (3) are arranged at two ends of the power structure (4); the conveying structure (1) further comprises an installation frame (101), a sliding frame (102), guide rollers (103), a conveying belt (104) and sliding rods (105), the guide rollers (103) are installed at the upper end of the installation frame (101), the conveying belt (104) is arranged on the guide rollers (103), the two sliding rods (105) are fixedly installed at the lower end of the conveying belt (104), the sliding frame (102) is slidably installed on the sliding rods (105), and five groups of guide rollers (103) are arranged.

2. A feeding mechanism for machining convenient for stepped speed regulation as claimed in claim 1, wherein: the sliding structure (2) further comprises an auxiliary plate (201), an extension plate (202), a mounting groove (206) and a sliding block (207), the auxiliary plate (201) is mounted at the lower end of the conveyor belt (104), the mounting groove (206) is formed in the auxiliary plate (201), the downward extension plate (202) is mounted in the middle of the sliding frame (102), the sliding block (207) is fixedly mounted at the bottom of the extension plate (202), and the sliding block (207) is slidably mounted in the mounting groove (206).

3. A feeding mechanism for machining convenient for stepped speed regulation as claimed in claim 1, wherein: sliding structure (2) are still including chucking piece (208), have seted up three inner groovies of group on mounting groove (206) inner wall, and chucking piece (208) that have the spring are all installed to sliding block (207) front and back end, and chucking piece (208) can be with the mutual block of inner groovy.

4. A feeding mechanism for machining convenient for stepped speed regulation as claimed in claim 1, wherein: the sliding structure (2) further comprises a sliding plate (203), protruding heads (204) and sliding grooves (205), three groups of sliding grooves (205) are formed in the auxiliary plate (201), the protruding heads (204) are arranged at the upper end of the extending plate (202), the sliding plate (203) is slidably mounted in the three groups of sliding grooves (205), meanwhile, the sliding plate (203) is fixed on the extending plate (202) through the protruding blocks, and a handle is arranged at the outer end of the sliding plate (203).

5. A feeding mechanism for machining convenient for stepped speed regulation as claimed in claim 1, wherein: adjust structure (3) still including side board (301), side slide (302), dead lever (303), side spout (304), the rear end position at accessory plate (201) is fixed in side board (301), slidable mounting has side slide (302) on side board (301), vertical spout has been seted up on side slide (302), hug closely and install dead lever (303) in side slide (302), dead lever (303) outer end slidable mounting is in vertical spout, dead lever (303) inner slidable mounting is in the side spout (304) of twice slope.

6. A feeding mechanism for machining convenient for stepped speed regulation as claimed in claim 1, wherein: the adjusting structure (3) further comprises a connecting plate (305) and a screw rod (306), the connecting plate (305) is used for connecting and fixing the side sliding plates (302) at the left end and the right end, and the screw rod (306) is installed in the middle of the connecting plate (305).

7. A feeding mechanism for machining convenient for stepped speed regulation as claimed in claim 1, wherein: power structure (4) are still including cone pulley (401), fixed frame (402), inner spring (403), and fixed frame (402) both ends and dead lever (303) reciprocal anchorage, and three groups of cone pulleys (401) are installed to fixed frame (402) internal rotation, and the root position of every group cone pulley (401) all adds and is equipped with inner spring (403), and three groups of cone pulleys (401) size are different structures, and the axis of every group cone pulley (401) all corresponds each other with the inner groovy simultaneously.

8. A feeding mechanism for machining convenient for stepped speed regulation as claimed in claim 1, wherein: the power structure (4) is characterized by further comprising a belt (404), a pressing plate (405), a screw rod (406) and a sliding shaft (407), wherein the belt (404) is installed at the outer end of the root of the three groups of cone wheels (401), the pressing plate (405) is installed at the position of the middle cone wheel (401) in a sliding mode, the screw rod (406) is installed on the pressing plate (405), the pressing plate (405) is integrally of an arc-shaped structure, and the sliding shaft (407) is installed at two ends of the pressing plate (405) respectively.