CN114536114B

CN114536114B - Multi-shaft linkage special tool grinding machine

Info

Publication number: CN114536114B
Application number: CN202210258507.1A
Authority: CN
Inventors: 冯晓飞
Original assignee: Wuhu Hongjin Machine Tools Co ltd
Current assignee: Wuhu Hongjin Machine Tools Co ltd
Priority date: 2022-03-16
Filing date: 2022-03-16
Publication date: 2022-10-14
Anticipated expiration: 2042-03-16
Also published as: CN114536114A

Abstract

The invention relates to an automatic grinding point location technology, which is used for solving the problems of low equipment utilization rate, low production efficiency and easy falling of scraps on a lead screw to damage the lead screw during the processing of a multi-shaft linkage grinding machine, in particular to a multi-shaft linkage special tool grinding machine; according to the invention, a plurality of groups of products to be processed are distributed at the B-direction rotating center in an annular array manner, the products can be processed at the front station, the rear station can be used for continuously feeding, the front station can be used for discharging, the processing procedure is effectively optimized, the long-time waiting process of a robot for feeding and discharging is avoided, the utilization rate of equipment is improved, the production efficiency is effectively increased, meanwhile, a cleaning mechanism is arranged outside the nylon cover, the chips above the nylon cover can be cleaned in time, the nylon cover is prevented from being punctured when the nylon cover shrinks, the chips are prevented from entering the nylon cover to damage the lead screw, the service life of the lead screw is further prolonged, and the maintenance cost is reduced.

Description

Multi-shaft linkage special tool grinding machine

Technical Field

The invention relates to an automatic grinding point location technology, in particular to a multi-shaft linkage special tool grinding machine.

Background

The application of the numerical control tool grinder in the mechanical manufacturing is more and more extensive, can carry on the abrasive machining to the cutting tool including all kinds of milling cutter, bit cutter, wherein the five-axis linkage numerical control grinder is mainly used for processing all kinds of cutters of the hard alloy material, the different varieties of specifications of cutters can be processed and finished independently, integrally, automatically on the five-axis linkage cutter grinder, have irreplaceable important function in the mechanical manufacturing field;

at present, the existing multi-axis linkage special tool grinding machine still has shortcomings, most grinding machines can only complete a certain processing procedure when in use, and the processing needs to be completed in the order of loading, processing and unloading, and the mechanism can lead the loading and unloading mechanism to be always in an idle state in the processing process, thus leading the equipment utilization rate to be low, thereby reducing the production efficiency, meanwhile, because the multi-axis linkage grinding machine often has a high-precision lead screw, the processed chips are easy to splash or puncture a nylon cover, when the chips fall on the high-precision lead screw, the lead screw is easy to scrap, the cost of maintenance is increased, and the economic production of enterprises is not facilitated;

in view of the above technical problems, the present application proposes a solution.

Disclosure of Invention

In the invention, a plurality of groups of products to be processed are distributed at a B-direction rotating center in an annular array, the products can be placed on processing stations by a six-axis robot during processing, then the stations are driven to advance by the rotation of the B-direction rotating center, so that the products can be processed on the stations in front, the stations in rear can continue to be loaded, the stations in the front can be unloaded, the processing procedure is effectively optimized, the long-time waiting process of the loading and unloading robot is avoided, the utilization rate of the equipment is improved, the limiting time of the equipment is reduced, the production efficiency is effectively increased, the C-direction rotating grinding wheel spindle can realize complex movement under the driving of the X-axis spindle and the Y-axis spindle, the coarse grinding station, the fine grinding station and the angle cleaning, the R-angle station or the single product grinding are integrally processed, the occupied area is saved, one worker can operate a plurality of equipment, the working efficiency is improved, meanwhile, a nylon maintenance cover is arranged outside the X-axis spindle and the Y-axis spindle, the cut chips are prevented from falling onto the lead screw, meanwhile, a cleaning mechanism is arranged outside the nylon cover, the nylon cover is prevented from being damaged during processing, and the nylon cover is prevented from falling, the nylon cover is used for maintaining and the special grinding machine.

The purpose of the invention can be realized by the following technical scheme:

a multi-axis linkage special tool grinding machine comprises a machine body, wherein a product tray is arranged on the side face of the machine body, a six-axis robot for feeding is arranged above the product tray, an X-axis spindle is arranged above the machine body, a Y-axis spindle is arranged above the X-axis spindle, a C-direction rotating grinding wheel spindle is arranged above the Y-axis spindle, the X-axis spindle, the Y-axis spindle and the C-direction rotating grinding wheel spindle are annularly arranged above the machine body, and a B-direction rotating center is rotatably connected to the center above the machine body;

the B-direction rotating center is driven by a DD motor cam divider at the lower part, the C-direction rotating grinding wheel main shaft is provided with a diamond grinding wheel at one side, the X-axis main shaft and the Y-axis main shaft are both composed of an inner lead screw and an outer shell, the Y-axis spindle is arranged above an outer shell of the X-axis spindle, the C-axis rotating grinding wheel spindle is rotatably connected above the outer shell of the Y-axis spindle, nylon covers are arranged at two ends of the outer shells of the X-axis spindle and the Y-axis spindle, and a baffle is arranged at one end, away from the outer shells of the X-axis spindle and the Y-axis spindle, of each nylon cover.

As a preferred embodiment of the invention, the top end of the baffle is fixedly connected with a cleaning mechanism and a matching mechanism, the cleaning mechanism comprises a first support, a second support, a connecting frame, a limiting rod, a rotating rod, a belt groove, a spring and clamping grooves, the first support and the second support are two sets of semi-circular arc frames which are arranged oppositely, the side wall of the second support is provided with the clamping grooves, the clamping grooves penetrate through the second support, a precession shaft penetrates through the second support, a gap is reserved between the precession shaft and the second support, the outer wall of the precession shaft is sleeved with a precession wheel, the precession wheel is rotatably connected inside the clamping grooves, the outer walls of the second support and the first support are provided with the belt groove, and a cleaning belt is clamped inside the belt groove.

As a preferred embodiment of the present invention, the inner wall of the first bracket is fixedly connected with a limiting rod, the side wall of the first bracket is rotatably connected with a rotating rod, the rotating rod is clamped between two sets of limiting rods, the top of the inner wall of the first bracket is fixedly connected with a spring, the bottom end of the spring is fixedly connected to the upper surface of the rotating rod, and the top end of the rotating rod is rotatably connected with a compensation block.

As a preferred embodiment of the present invention, the upper surface of the compensation block is provided with a plurality of sets of limiting wheels, a gap is left between each limiting wheel and the compensation block, the cross section of the cleaning belt is in a convex structure, the belt groove is also in a convex structure, the bottom end of the cleaning belt is clamped between the upper surface of the compensation block and the bottom end of the limiting wheel, and the convex part of the cleaning belt is provided with bristles.

As a preferred embodiment of the present invention, a plurality of groups of the first supports and the second supports are disposed on the outer wall of the precession shaft at equal intervals, the plurality of groups of the first supports and the second supports are connected through a connecting frame, the connecting frame has two groups of connecting rods forming an X-shaped structure, the middle parts of the two groups of connecting rods are rotatably connected through a rotating shaft, and two ends of the connecting rod are rotatably connected outside the side walls of the first supports and the second supports.

In a preferred embodiment of the present invention, a return spring is disposed at one end of the connecting frame, and two ends of the return spring are respectively mounted on two sets of connecting rods of the connecting frame.

As a preferred embodiment of the present invention, one end of the precession shaft is fixedly connected to a top end of the baffle, one end of the baffle, which is away from the precession shaft, is fixedly connected to a matching mechanism, the matching mechanism includes a safety block, a rotating wheel and a support rod, the safety block is disposed at two ends of the support rod, one group of the safety blocks is connected to the baffle, the rotating wheel is slidably connected to an outer wall of the support rod, and the cleaning belt is wound around an outer wall of the rotating wheel.

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

1. according to the invention, a plurality of groups of products to be processed are distributed at the position of the B-direction rotating center in an annular array, the products can be placed on processing stations by the six-axis robot during processing, and then the stations are driven to advance by the rotation of the B-direction rotating center, so that the products can be processed on the stations in front, the stations in the rear can continue to be loaded, the station in the front can be loaded, the station in the foremost can be loaded, the processing procedure is effectively optimized, the long-time waiting process of the loading and unloading robot is avoided, the utilization rate of equipment is improved, the idle time of the equipment is reduced, and the production efficiency is effectively increased.

2. According to the invention, the C-direction rotating grinding wheel spindle can realize complex movement under the driving of the X-axis spindle and the Y-axis spindle, and the integrated grinding processing of the rough and fine grinding station, the corner cleaning station and the R-angle station or a single product is realized, so that the product grinding efficiency is effectively improved, the floor area is saved, one worker can operate multiple devices, and the working efficiency is improved.

3. According to the invention, the nylon covers are arranged outside the X-axis main shaft and the Y-axis main shaft, so that cut chips are prevented from falling on the lead screw, the lead screw is protected, meanwhile, the cleaning mechanism is arranged outside the nylon covers, so that the chips above the nylon covers can be cleaned in time, the chips are prevented from puncturing the nylon covers when the nylon covers shrink, the chips are prevented from entering the nylon covers to damage the lead screw, the service life of the lead screw is further prolonged, the maintenance cost is reduced, and the economic benefit is improved.

Drawings

In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.

FIG. 1 is a schematic front view of the structure of the present invention;

FIG. 2 is an enlarged schematic view of the structure at A in FIG. 1 according to the present invention;

FIG. 3 is a schematic top view of the present invention;

FIG. 4 is a schematic view of the cleaning mechanism of the present invention;

FIG. 5 is an enlarged view of the structure at B in FIG. 4 according to the present invention;

FIG. 6 is an enlarged view of the structure of FIG. 4 at C according to the present invention;

FIG. 7 is a schematic view of a screw shaft structure according to the present invention;

FIG. 8 is a schematic structural view of a first bracket and a second bracket according to the present invention;

fig. 9 is a schematic structural diagram of the fitting mechanism of the present invention.

In the figure: 1. a bed body; 2. an X-axis spindle; 3. a Y-axis spindle; 4. rotating the grinding wheel spindle in the direction C; 5. a product tray; 6. b is to the rotation center; 7. a six-axis robot; 8. a cleaning mechanism; 81. a first bracket; 82. a second bracket; 83. a connecting frame; 84. a limiting rod; 85. rotating the rod; 86. a belt groove; 87. a spring; 88. a card slot; 9. a mating mechanism; 91. a safety block; 92. a rotating wheel; 93. a support bar; 10. screwing in the shaft; 11. a precession wheel; 12. a compensation block; 13. a limiting wheel; 14. a nylon cover; 15. cleaning the belt; 16. a reset spring; 17. and a baffle plate.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The first embodiment is as follows:

referring to fig. 1-3, a multi-axis linkage special tool grinding machine comprises a machine body 1, wherein the machine body 1 is made of natural marble, the characteristics of small linear expansion coefficient, difficult rusting, wear resistance and magnetism prevention of the marble are utilized, the processing stability and the service life of the grinding machine are effectively improved, a product tray 5 is arranged on the side surface of the machine body 1 and used for placing products to be processed and processed, meanwhile, the products which are not processed and processed are stored in a partition mode, a six-axis robot 7 used for feeding is arranged above the product tray 5, the six-axis robot 7 can load and unload a swinging disc to the products, the products can be placed on a processing station through the six-axis robot 7 during processing, the station is driven to advance through the rotation of a B-direction rotation center 6, so that the products can be processed on the station in front, and the station in the rear part is continuously loaded, the frontmost station can carry out blanking, the processing procedure is effectively optimized, the long-time waiting process of a loading and unloading robot is avoided, the utilization rate of equipment is improved, the idle time of the equipment is reduced, the production efficiency is effectively increased, an X-axis main shaft 2 is arranged above a machine body 1, a Y-axis main shaft 3 is arranged above the X-axis main shaft 2, the X-axis main shaft 2 and the Y-axis main shaft 3 are annularly distributed outside a B-direction rotating center 6, a C-direction rotating grinding wheel main shaft 4 is arranged above the Y-axis main shaft 3, the C-direction rotating grinding wheel main shaft 4 can realize complex movement under the driving of the X-axis main shaft 2 and the Y-axis main shaft 3, the integrated grinding processing of a rough and fine grinding station, a fine grinding station and a corner cleaning station, an R corner station or a single product is realized, the product grinding efficiency is effectively improved, the occupied area is saved, and one worker can operate a plurality of equipment, the working efficiency is improved, the X-axis spindle 2, the Y-axis spindle 3 and the C-direction rotating grinding wheel spindle 4 are annularly arranged above the machine body 1, and the center above the machine body 1 is rotationally connected with a B-direction rotating center 6;

a conjoined direction-dividing lifting mechanism is arranged at the top end of the B-direction rotating center 6, a controller for controlling a driving part is arranged in a machine body, the B-direction rotating center 6 is driven by a DD motor cam divider at the lower part to realize higher driving precision and ensure processing precision, a diamond grinding wheel is arranged at one side of a C-direction rotating grinding wheel spindle 4 and can swing left and right along with the C-direction rotating grinding wheel spindle 4 to realize a grinding process of a workpiece, an X-direction spindle 2 and a Y-direction spindle 3 are both composed of an inner lead screw and an outer shell, the inner lead screw is driven by a high-precision servo motor, the Y-direction spindle 3 is arranged above the outer shell of the X-direction spindle 2, so that the foundation of the Y-direction spindle 3 can move along with the X-direction spindle 2, realize the cooperation removal of Y axial main shaft 3 and X axial main shaft 2, accomplish C to the removal of rotatory emery wheel main shaft 4 in the plane inside, C rotates to rotatory emery wheel main shaft 4 and connects in the outside casing top of Y axial main shaft 3, X axial main shaft 2 all is provided with nylon cover 14 with the outside casing both ends of Y axial main shaft 3, be used for protecting the lead screw, the piece that produces when preventing to cut drops on the lead screw, improve the life of lead screw, the one end that the outside casing of X axial main shaft 2 and Y axial main shaft 3 was kept away from to nylon cover 14 is provided with baffle 17, the other end of fixed nylon cover 14, and X axial main shaft 2 all is provided with nylon cover 14 with the both ends of Y axial main shaft 3, make X axial main shaft 2 and Y axial main shaft 3 only can move between two sets of baffle 17.

Example two:

referring to fig. 1-9, a cleaning mechanism 8 and a matching mechanism 9 are fixedly connected to the top end of the baffle 17, the cleaning mechanism 8 and the matching mechanism 9 are distributed on both sides of the baffle 17, the cleaning mechanism 8 includes a first bracket 81, a second bracket 82, a connecting bracket 83, a limiting rod 84, a rotating rod 85, a belt groove 86, a spring 87 and a slot 88, the first bracket 81 and the second bracket 82 are two sets of semi-circular frames arranged oppositely, a gap is left between the first bracket 81 and the second bracket 82, the side wall of the second bracket 82 is provided with a slot 88, the slot 88 penetrates through the second bracket 82 for the revolving wheel 11 to pass through, the second bracket 82 is internally provided with a revolving shaft 10, the revolving shaft 10 is fixedly installed on the side wall of the baffle 17, the revolving shaft 10 on the X axial main shaft 2 does not overlap with the Y axial main shaft 3 in the axial direction, the revolving shaft 10 on the Y axial main shaft 3 does not overlap with the X axial main shaft 2 in the axial direction, thereby avoiding the precession shaft 10 from influencing the movement of the X-axis main shaft 2 or the Y-axis main shaft 3, a gap is left between the precession shaft 10 and the second bracket 82, the precession wheel 11 is sleeved on the outer wall of the precession shaft 10, the precession wheel 11 is rotatably connected in the clamping groove 88, so that the precession wheel 11 can drive the cleaning belt 15 to rotate through the outside clamping teeth, the second bracket 82 and the first bracket 81 are provided with belt grooves 86, the belt grooves 86 are in a convex structure, the cleaning belt 15 is clamped in the belt grooves 86, the cross section of the cleaning belt 15 is in a convex structure, so that the wide part below the cleaning belt 15 can be clamped on the wide part on the belt grooves 86, the cleaning belt 15 is prevented from sliding down from the belt grooves 86, the inner wall of the first bracket 81 is fixedly connected with a limiting rod 84, the side wall of the first bracket 81 is rotatably connected with a rotating rod 85, dwang 85 presss from both sides between two sets of gag lever posts 84, guarantee that the direction of motion of dwang 85 is perpendicular, first support 81 inner wall top fixedly connected with spring 87, be used for promoting dwang 85 downwards, make dwang 85 can drive compensation block 12 and descend, thereby taut clean belt 15, guarantee clean belt 15's operating stability, spring 87 bottom fixed connection is at the dwang 85 upper surface, dwang 85 top is rotated and is connected with compensation block 12, compensation block 12 upper surface is provided with the spacing wheel 13 of multiunit, leave the clearance between spacing wheel 13 and the compensation block 12, clean belt 15 bottom block is between compensation block 12 upper surface and spacing wheel 13 bottom, make spacing wheel 13 and compensation block 12 can drive clean belt 15 downstream, clean belt 15 bellying is provided with the brush hair, the brush hair can clean the piece on nylon cover 14 when rotating under first support 81 and second support 82, simultaneously because the brush hair is located the bulge of clean belt 15, and clean belt 15's stop gear is then gathered at clean belt 15's bottom widened part, thereby avoided the brush hair to influence the rotation of clean belt 15.

Example three:

referring to fig. 4-6, a plurality of sets of first brackets 81 and second brackets 82 are disposed on the outer wall of the precession shaft 10 at equal intervals, the plurality of sets of first brackets 81 are connected to the second brackets 82 through a connecting frame 83, the connecting frame 83 has two sets of connecting rods forming an X-shaped structure, and the middle portions of the two sets of connecting rods are rotatably connected through a rotating shaft, two ends of the connecting rods are rotatably connected to the outer side walls of the first brackets 81 and the second brackets 82, when the X-axis spindle 2 or the Y-axis spindle 3 moves to approach the baffle 17, one set of first brackets 81 is pressed, the first brackets 81 presses the connecting frame 83, so that the connecting frame 83 deforms and drives the second brackets 82 to move, when the second brackets 82 move, the internal precession wheel 11 is driven to rotate on the precession shaft 10, and further the cleaning belt 15 on the outer side is driven to move, one end of the connecting frame 83 is provided with a return spring 16, two ends of a reset spring 16 are respectively arranged on two groups of connecting rods of the connecting frame 83, when the connecting frame 83 is extruded and deformed, the reset spring 16 is compressed, so that elastic potential energy is accumulated in the reset spring 16, when the outer shell leaves the second support 82, the reset spring 16 is released to drive the connecting frame 83 to reset, one end of the precession shaft 10 is fixedly connected to the top end of the baffle 17, one end of the baffle 17, which is far away from the precession shaft 10, is fixedly connected with a matching mechanism 9, the matching mechanism 9 comprises a safety block 91, a rotating wheel 92 and a supporting rod 93, the safety block 91 is arranged at two ends of the supporting rod 93 to prevent the rotating wheel 92 from falling off the supporting rod 93, one group of the safety blocks 91 is connected to the baffle 17, the rotating wheel 92 is slidably connected to the outer wall of the supporting rod 93, and the cleaning belt 15 is wound on the outer wall of the rotating wheel 92, so that the cleaning belt 15 can drive the rotating wheel 92 to slide on the supporting rod 93, thereby ensuring that the direction of the cleaning belt 15 is always perpendicular to the supporting rod 93, the cleaning belt 15 is prevented from being inclined.

With reference to the second embodiment and the third embodiment, the working principle is as follows:

according to the invention, the nylon cover 14 is arranged outside the X-axis main shaft 2 and the Y-axis main shaft 3, so that cut chips are prevented from falling on the lead screw, the lead screw is protected, the cleaning mechanism 8 is arranged outside the nylon cover 14, when the X-axis main shaft 2 or the Y-axis main shaft 3 moves in a certain direction, the nylon cover 14 on the side is extruded, and the second support 82 on the side is extruded, so that the second support 82 drives the connecting frame 83 to deform, the first support 81 is driven to move on the precession shaft 10, and then the precession wheel 11 spirally advances on the precession shaft 10 to drive the cleaning belt 15 to rotate, so that the cleaning belt 15 can timely clean the chips above the nylon cover 14, the chips are prevented from puncturing the nylon cover 14 when the nylon cover 14 contracts, the chips are prevented from entering the nylon cover 14 to damage the lead screw, the service life of the lead screw is further prolonged, the maintenance cost is reduced, and the economic benefit is improved.

The preferred embodiments of the present invention disclosed above are intended to aid in the description of the invention. The preferred embodiments are not exhaustive and do not limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, thereby enabling others skilled in the art to best understand the invention and its practical application. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A multi-axis linkage special tool grinding machine comprises a machine body (1), wherein a product tray (5) is arranged on the side face of the machine body (1), and a six-axis robot (7) for feeding is arranged above the product tray (5), and is characterized in that an X-axis spindle (2) is arranged above the machine body (1), a Y-axis spindle (3) is arranged above the X-axis spindle (2), a C-direction rotating grinding wheel spindle (4) is arranged above the Y-axis spindle (3), the X-axis spindle (2), the Y-axis spindle (3) and the C-direction rotating grinding wheel spindle (4) are annularly arranged above the machine body (1), and a B-direction rotating center (6) is rotatably connected to the center above the machine body (1);

the machine is characterized in that a connected directional lifting mechanism is mounted at the top end of the B-direction rotating center (6), a controller for controlling a driving part is arranged in a machine body, the B-direction rotating center (6) is driven by a DD motor cam divider below the B-direction rotating center, a diamond grinding wheel is mounted on one side of the C-direction rotating grinding wheel spindle (4), the X-direction spindle (2) and the Y-direction spindle (3) are both composed of an inner lead screw and an outer shell, the Y-direction spindle (3) is arranged above the outer shell of the X-direction spindle (2), the C-direction rotating grinding wheel spindle (4) is rotatably connected above the outer shell of the Y-direction spindle (3), nylon covers (14) are arranged at two ends of the outer shells of the X-direction spindle (2) and the Y-direction spindle (3), and a baffle (17) is arranged at one end, far away from the X-direction spindle (2) and the outer shell of the Y-direction spindle (3), of each nylon cover (14);

the cleaning device is characterized in that a cleaning mechanism (8) and a matching mechanism (9) are fixedly connected to the top end of the baffle plate (17), the cleaning mechanism (8) comprises a first support (81), a second support (82), a connecting frame (83), a limiting rod (84), a rotating rod (85), a belt groove (86), a spring (87) and a clamping groove (88), the first support (81) and the second support (82) are two sets of semicircular arc frames which are oppositely arranged, the clamping groove (88) is formed in the side wall of the second support (82), the second support (82) is penetrated by the clamping groove (88), a spiral shaft (10) is arranged in the second support (82), a gap is reserved between the spiral shaft (10) and the second support (82), a spiral wheel (11) is sleeved on the outer wall of the spiral shaft (10), the rotary wheel (11) is rotatably connected in the clamping groove (88), the second support (82) and the outer wall of the first support (81) are provided with the belt groove (86), the inner wall of the first support (81) is fixedly connected with the limiting rod (84), the first support (85), and the inner wall of the limiting rod (85) is connected with the limiting rod (85), the utility model discloses a safety belt, including first support (81) inner wall top fixedly connected with spring (87), spring (87) bottom fixed connection is at dwang (85) upper surface, dwang (85) top is rotated and is connected with compensation piece (12), compensation piece (12) upper surface is provided with multiunit spacing wheel (13), leave the clearance between spacing wheel (13) and compensation piece (12), the transversal shape structure of personally submitting of clean belt (15), belt groove (86) also are shape structure, clean belt (15) bottom block is between compensation piece (12) upper surface and spacing wheel (13) bottom, the protruding department of clean belt (15) is provided with the brush hair, multiunit interval such as first support (81) and second support (82) sets up at precession axle (10) outer wall, multiunit link between first support (81) and second support (82) through link (83), link (83) have two sets of connecting rods to constitute X type structure, and rotate through the pivot in the middle part of two sets of connecting rods and connect, the both ends of this connecting rod rotate to connect and connect at first support (81) and second support (82) top of the baffle (16) outer wall, reset spring (17) is provided with the overhead end of connecting rod (17) respectively, one end fixedly connected with cooperation mechanism (9) of precession axle (10) are kept away from in baffle (17), cooperation mechanism (9) are including insurance block (91), rotation wheel (92) and bracing piece (93), insurance block (91) set up at bracing piece (93) both ends, and one of them a set of insurance block (91) are connected on baffle (17), rotate wheel (92) sliding connection at bracing piece (93) outer wall, and clean belt (15) wraparound connects at rotation wheel (92) outer wall.