CN115673221A

CN115673221A - Screw processing multistation cold heading machine

Info

Publication number: CN115673221A
Application number: CN202211324200.3A
Authority: CN
Inventors: 阎军; 王建
Original assignee: Xiaogan Hongmao Machinery Equipment Co ltd
Current assignee: Xiaogan Hongmao Machinery Equipment Co ltd
Priority date: 2022-10-27
Filing date: 2022-10-27
Publication date: 2023-02-03

Abstract

The invention provides a screw machining multi-station cold header, and relates to the technical field of cold headers, wherein a cold header body is installed at the top end of a bottom plate, a controller is installed on one side of the top end of the cold header body, and a screening mechanism is arranged below a discharge port; through being provided with clean mechanism in one side of feed inlet, utilize clean mechanism's clean chamber, the feed port, rotatory chamber, the dust absorption mouth, the dust storage box, the dust absorption fan, circular tooth, drive gear, the transmission shaft, first servo motor, the fixed slot, the commentaries on classics piece, the installation cavity, second servo motor, the threaded rod, the thread bush, the hinge bar, the cleaning brush, the gag lever post, the guide bar, the uide bushing, the worm, mutually supporting of worm wheel, usable cleaning brush carries out cleaning to the lateral wall of raw materials for production, iron rust and the dust of raw materials for production lateral wall clear up, make raw materials for production clean cleaner and tidy, thereby the practicality of this cold heading machine when using has been improved greatly.

Description

Screw processing multistation cold heading machine

Technical Field

The invention relates to the technical field of cold headers, in particular to a screw machining multi-station cold header.

Background

Along with the development of economy, the technological level is continuously improved, the mechanical industry in China is developed very rapidly, and cold headers are used more and more, wherein the cold headers mainly use piers and are special equipment specially used for producing fasteners such as nuts and bolts in batches, according to the metal plastic deformation theory, a certain pressure is applied to a metal blank at normal temperature to enable the metal blank to generate plastic deformation in a die cavity, and the metal blank is formed according to the specified shape and size;

the processing raw materials of the cold header are coiled steel wires, however, when the existing cold header processes the steel wires into screws, the existing cold header basically processes the production raw materials directly, the production raw materials are not cleaned before processing, and iron rust and garbage attached to the outer sides of some production raw materials are cleaned, so that the products discharged by the production raw materials are not clean and tidy enough, the quality of the cold header products is influenced, meanwhile, scraps produced in the mixed processing process of finished products are inconvenient to screen, manual secondary screening is needed, the labor intensity of workers is increased, and the practicability of the cold header during use is reduced.

Disclosure of Invention

Aiming at the problems, the invention provides a screw machining multi-station cold header, which solves the problem that in the prior art, the outer side wall of a production raw material is inconvenient to clean, so that a finished product is not clean and tidy enough.

In order to realize the purpose of the invention, the invention is realized by the following technical scheme: a multi-station cold header for screw machining comprises a bottom plate, wherein a cold header body is installed at the top end of the bottom plate, a controller is installed on one side of the top end of the cold header body, a feed port is installed on one side of the cold header body, a cleaning mechanism is arranged on one side of the feed port, a discharge port is installed on the other side of the cold header body, and a screening mechanism is arranged below the discharge port;

clean mechanism is including clean chamber, feed port, rotatory chamber, dust absorption mouth, dust storage box, dust absorption fan and clean brush, clean chamber is installed in one side of cold heading machine body, the inside in clean chamber is run through there is the feed port, the internally mounted in clean chamber has rotatory chamber, the inside in rotatory chamber is provided with the moving structure, the clean brush is installed to the one end of moving structure, the outside in rotatory chamber is provided with the revolution mechanic, the dust absorption mouth is installed to the bottom in clean chamber, dust storage box installs the top in bottom plate one side, dust storage fan is installed to one side of dust storage box, dust storage box's one end is linked together through the one end of pipeline with the dust absorption mouth.

The further improvement lies in that: revolution mechanic includes circular tooth, drive gear, transmission shaft, a servo motor, worm wheel and spacing subassembly, circular tooth sets up in the both ends in the rotatory chamber outside, drive gear installs in the both sides of the inside bottom in clean chamber, intermeshing between circular tooth and the drive gear, the transmission shaft is installed to drive gear's inboard, the worm wheel is installed to one side of drive gear, the front end meshing of worm wheel has the worm, a servo motor installs in the bottom in clean chamber, a servo motor's output is connected with the one end of worm.

The further improvement lies in that: the limiting assembly comprises a fixing groove and a rotating block, the fixing groove is formed in two sides of the inside of the cleaning cavity, the rotating block is installed inside the fixing groove, and one end of the rotating block is connected with one end of the rotating cavity.

The further improvement lies in that: the inner diameter of the fixing groove is larger than the outer diameter of the rotating block, and a rotating structure is formed between the fixing groove and the rotating block.

The further improvement lies in that: the movable structure comprises an installation cavity, a second servo motor, a threaded rod, a threaded sleeve, a hinged rod, a limiting sleeve and a guide assembly, wherein the installation cavity is installed at the top end and the bottom end of the inner side of the rotary cavity, the second servo motor is installed on one side of the installation cavity, the threaded rod is installed below the inner part of the second servo motor, the output end of the second servo motor is connected with one end of the threaded rod, the thread directions of the two ends of the threaded rod are opposite, the outer side wall of the threaded rod is symmetrically provided with the threaded sleeve, the bottom end of the threaded sleeve is hinged with the hinged rod, the bottom end of the hinged rod is hinged with the top end of the cleaning brush, the limiting rod is installed above the inner part of the installation cavity, the outer side wall of the limiting rod is symmetrically provided with the limiting sleeve, and the bottom end of the limiting sleeve is connected with the top end of the threaded sleeve.

The further improvement lies in that: the guide assembly comprises a guide rod and a guide sleeve, the guide rod is installed above and below the inner wall of the rotary cavity, the guide sleeve is arranged on the outer side wall of the guide rod, and one end of the guide sleeve is connected with one end of the cleaning brush.

The further improvement lies in that: screening mechanism is including screening chamber, sieve, play flitch, expanding spring and power structure, the below in the discharge gate is installed in the screening chamber, the inside in screening chamber sets up in the inside of sieve, a flitch is installed at the both ends of sieve, the one end that goes out the flitch extends in the outside in screening chamber, install expanding spring on the inner wall in screening chamber, expanding spring's top is connected with the bottom that goes out the flitch.

The further improvement lies in that: the utility model discloses a screening chamber, including the fixed chamber of power structure, including fixed chamber, third servo motor, driving gear, movable frame, movable rod, dead lever and movable sleeve, fixed chamber is installed in the both sides in screening chamber, third servo motor is installed to the one end in fixed chamber, the internally mounted in fixed chamber has the driving gear, third servo motor's output is connected with the one end of driving gear, the lateral wall of driving gear is provided with the movable frame, the inside both sides of movable frame are provided with the driving rack, the inboard intermeshing of driving gear and movable frame, the movable rod is installed on the top of movable frame, the one end of movable rod extends to the outside in fixed chamber, the top of movable rod is connected with the bottom of play flitch, the dead lever is installed to the inside one side in fixed chamber, the lateral wall of dead lever is provided with the movable sleeve, the one end of movable sleeve is connected with the one end of movable frame.

The invention has the beneficial effects that: by arranging the cleaning mechanism on one side of the feeding hole, the cleaning cavity, the feeding hole, the rotating cavity, the dust collection port, the dust storage box, the dust collection fan, the circular teeth, the transmission gear, the transmission shaft, the first servo motor, the fixed groove, the rotating block, the mounting cavity, the second servo motor, the threaded rod, the threaded sleeve, the hinge rod, the cleaning brush, the limiting rod, the limiting sleeve, the guide rod, the guide sleeve, the worm and the worm wheel are matched with each other, the cleaning brush can be used for cleaning the outer side wall of the production raw material, and rust and dust on the outer side wall of the production raw material can be cleaned, so that the production raw material is cleaner and cleaner, and the practicability of the cold header is greatly improved; through being provided with the screening mechanism in the below of discharge gate, utilize the screening chamber of screening mechanism, the sieve, go out the flitch, expanding spring, fixed chamber, third servo motor, the driving gear, the adjustable frame, the movable rod, dead lever and the mutual cooperation of movable sleeve, can filter the processing to the piece that produces in finished product and the course of working for the device ejection of compact is more high-efficient convenient, does not need artifical secondary screening, thereby has improved the work efficiency of this cold heading machine when using greatly.

Drawings

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

FIG. 2 is a schematic front sectional view of the screening mechanism of the present invention;

FIG. 3 is a schematic front sectional view of the cleaning mechanism of the present invention;

FIG. 4 is a schematic side view of the rotary chamber of the present invention;

FIG. 5 is an enlarged view of a portion of FIG. 2;

fig. 6 is a schematic view of the enlarged structure at B in fig. 2 according to the present invention.

Wherein: 1. a base plate; 2. a cold header body; 3. a controller; 4. a feed inlet; 5. a discharge port; 6. cleaning the cavity; 7. a feed port; 8. a rotating chamber; 9. a dust suction port; 10. a dust storage box; 11. a dust collection fan; 12. round teeth; 13. a transmission gear; 14. a drive shaft; 15. a first servo motor; 16. fixing grooves; 17. rotating the block; 18. a mounting cavity; 19. a second servo motor; 20. a threaded rod; 21. a threaded sleeve; 22. a hinged lever; 23. a cleaning brush; 24. a limiting rod; 25. a limiting sleeve; 26. a guide bar; 27. a guide sleeve; 28. a screening chamber; 29. a sieve plate; 30. a discharge plate; 31. a tension spring; 32. a fixed cavity; 33. a third servo motor; 34. a driving gear; 35. a movable frame; 36. a movable rod; 37. fixing the rod; 38. a movable sleeve; 39. a worm; 40. a worm gear.

Detailed Description

In order to further understand the present invention, the following detailed description will be made with reference to the following examples, which are only used for explaining the present invention and are not to be construed as limiting the scope of the present invention.

According to fig. 1, 2, 3, 4, 5 and 6, the embodiment provides a screw processing multi-station cold header, which comprises a bottom plate 1, a cold header body 2 is installed on the top end of the bottom plate 1, a controller 3 is installed on one side of the top end of the cold header body 2, a feed inlet 4 is installed on one side of the cold header body 2, a cleaning mechanism is arranged on one side of the feed inlet 4, a discharge outlet 5 is installed on the other side of the cold header body 2, a screening mechanism is arranged below the discharge outlet 5, the cleaning mechanism comprises a cleaning cavity 6, a feed hole 7, a rotating cavity 8, a dust suction port 9, a dust storage box 10, a dust suction fan 11 and a cleaning brush 23, the cleaning cavity 6 is installed on one side of the cold header body 2, the feed hole 7 penetrates through the inside of the cleaning cavity 6, the rotating cavity 8 is installed inside the cleaning cavity 6, the inside of rotatory chamber 8 is provided with the removal structure, cleaning brush 23 is installed to the one end that removes the structure, the outside of rotatory chamber 8 is provided with revolution mechanic, dust absorption mouth 9 is installed to the bottom in clean chamber 6, dust storage box 10 installs in the top of bottom plate 1 one side, dust absorption fan 11 is installed to one side of dust storage box 10, dust storage box 10's one end is linked together through the one end of pipeline with dust absorption mouth 9, during the use, utilizes the removal structure to remove two cleaning brushes 23 to suitable position, then utilizes revolution mechanic to drive cleaning brush 23 and rotates, starts dust absorption fan 11 at last, under the cooperation of dust absorption mouth 9, with the piece rubbish of the ejection of compact of clean brush 23 through dust absorption mouth 9 and pipeline absorption into dust storage box 10's inside.

The rotating structure comprises circular teeth 12, a transmission gear 13, a transmission shaft 14, a first servo motor 15, a worm 39, a worm wheel 40 and a limiting component, the circular teeth 12 are arranged at two ends of the outer side of a rotating cavity 8, the transmission gear 13 is arranged at two sides of the bottom end of the inner part of a cleaning cavity 6, the circular teeth 12 and the transmission gear 13 are meshed with each other, the transmission shaft 14 is arranged on the inner side of the transmission gear 13, the worm wheel 40 is arranged at one side of the transmission gear 13, the worm 39 is meshed at the front end of the worm wheel 40, the first servo motor 15 is arranged at the bottom end of the cleaning cavity 6, the output end of the first servo motor 15 is connected with one end of the worm 39, the limiting component comprises a fixing groove 16 and a rotating block 17, the fixing groove 16 is arranged at two sides of the inner part of the cleaning cavity 6, and the rotating block 17 is arranged inside the fixing groove 16, one end of the rotating block 17 is connected with one end of the rotating cavity 8, the inner diameter of the fixed groove 16 is larger than the outer diameter of the rotating block 17, a rotating structure is formed between the fixed groove 16 and the rotating block 17, when the device is used, the first servo motor 15 is started to drive the worm 39 to rotate, the worm 39 and the worm wheel 40 are meshed with each other, the worm wheel 40 is driven to rotate, the worm wheel 40 is connected with one end of the transmission gear 13, the two transmission gears 13 are driven to rotate under the transmission of the transmission shaft 14, the transmission gear 13 and the circular teeth 12 are meshed with each other, the rotating cavity 8 is driven to rotate under the limiting of the fixed groove 16 and the rotating block 17, the two cleaning brushes 23 are driven to rotate, the outer side wall of a steel wire is cleaned by using the two cleaning brushes 23, iron rust and dust on the outer side wall of a production raw material are cleaned, and the production raw material is cleaner, thereby greatly improving the practicability of the cold header when in use.

The movable structure comprises a mounting cavity 18, a second servo motor 19, a threaded rod 20, a threaded sleeve 21, a hinged rod 22, a limiting rod 24, a limiting sleeve 25 and a guide assembly, the mounting cavity 18 is mounted at the top end and the bottom end of the inner side of the rotary cavity 8, the second servo motor 19 is mounted at one side of the mounting cavity 18, the threaded rod 20 is mounted below the inner portion of the second servo motor 19, the output end of the second servo motor 19 is connected with one end of the threaded rod 20, the thread directions of the two ends of the threaded rod 20 are opposite, the threaded sleeves 21 are symmetrically arranged on the outer side wall of the threaded rod 20, the bottom end of the threaded sleeve 21 is hinged to the hinged rod 22, the bottom end of the hinged rod 22 is hinged to the top end of the cleaning brush 23, the limiting rod 24 is mounted above the inner portion of the mounting cavity 18, the limiting sleeve 25 is symmetrically arranged on the outer side wall of the limiting rod 24, the bottom end of the hinged sleeve 25 is connected with the top end of the threaded sleeve 21, when the movable structure is used, the second servo motor 19 is started to drive the threaded rod 20 to rotate, the threaded rod 24 and the guide assembly drives the threaded rod 21 to move to the cleaning brush to move the raw material, so that the raw material is moved to the guide assembly, and the guide assembly is used for cleaning of the cold heading machine, thereby greatly improving the raw material production of the cold heading machine.

The guide assembly comprises a guide rod 26 and a guide sleeve 27, the guide rod 26 is installed above and below the inner wall of the rotating cavity 8, the guide sleeve 27 is arranged on the outer side wall of the guide rod 26, one end of the guide sleeve 27 is connected with one end of the cleaning brush 23, and when the cleaning brush is used, the cleaning brush 23 can be guided by utilizing the mutual matching between the guide rod 26 and the guide sleeve 27, so that the cleaning brush 23 is more stable when moving.

The screening mechanism comprises a screening cavity 28, a screen plate 29, a discharge plate 30, an expansion spring 31 and a power structure, the screening cavity 28 is installed below a discharge port 5, the inside of the screening cavity 28 is arranged inside the screen plate 29, the discharge plate 30 is installed at two ends of the screen plate 29, one end of the discharge plate 30 extends outside the screening cavity 28, the expansion spring 31 is installed on the inner wall of the screening cavity 28, the top end of the expansion spring 31 is connected with the bottom end of the discharge plate 30, the power structure comprises a fixed cavity 32, a third servo motor 33, a driving gear 34, a movable frame 35, a movable rod 36, a fixed rod 37 and a movable sleeve 38, the fixed cavity 32 is installed at two sides of the screening cavity 28, the third servo motor 33 is installed at one end of the fixed cavity 32, the driving gear 34 is installed inside the fixed cavity 32, the output end of the third servo motor 33 is connected with one end of the driving gear 34, the outer side wall of the driving gear 34 is provided with a movable frame 35, transmission racks are arranged on two sides inside the movable frame 35, the driving gear 34 is meshed with the inner side of the movable frame 35, a movable rod 36 is installed at the top end of the movable frame 35, one end of the movable rod 36 extends to the outside of the fixed cavity 32, the top end of the movable rod 36 is connected with the bottom end of the discharge plate 30, a fixed rod 37 is installed on one side inside the fixed cavity 32, a movable sleeve 38 is arranged on the outer side wall of the fixed rod 37, one end of the movable sleeve 38 is connected with one end of the movable frame 35, when the sieve plate is used, a screw falls on the sieve plate 29 through the discharge port 5, the third servo motor 33 is started at the moment to drive the driving gear 34 to rotate, and the driving gear 34 is designed as a half gear and the transmission racks inside the driving gear 34 and the movable frame 35 are meshed with each other, the event is under dead lever 37 and movable sleeve 38's is spacing, drive movable frame 35 through driving gear 34 and carry out up-and-down reciprocating motion, and then under expanding spring 31's cooperation, it shakes about driving sieve 29 and play flitch 30 through movable rod 36, because the arc design of sieve 29, make the rubbish piece fall into the inside of screening chamber 28 through sieve 29, the screw rolls through sieve 29 and falls to the inside of going out flitch 30, then carry out convenient ejection of compact to it, can filter the processing to the piece that produces in finished product and the course of working, it is more high-efficient convenient to make the device ejection of compact, do not need artifical secondary screening, thereby the work efficiency of this cold heading machine when using has been improved greatly.

The working principle is as follows: the working personnel firstly penetrate the production raw material into the interior of the cleaning cavity 6 from the feeding hole 7, then penetrate through the middle of the rotating cavity 8, feed is carried out through the feeding hole 4, then the second servo motor 19 is started to drive the threaded rod 20 to rotate, because the thread directions at two ends of the threaded rod 20 are opposite, under the limit of the limit rod 24 and the limit sleeve 25, the two threaded sleeves 21 are driven to move towards the middle through the threaded rod 20, and then the hinged rod 22 is driven to move, under the limit of the guide rod 26 and the guide sleeve 27, the cleaning brush 23 is driven to move through the hinged rod 22, the two cleaning brushes 23 are moved to the outer side of the production raw material, then the first servo motor 15 is started to drive the worm 39 to rotate, because the worm 39 and the worm wheel 40 are meshed with each other, the worm wheel 40 is driven to rotate, because the worm wheel 40 is connected with one end of the transmission gear 13, under the transmission of the transmission shaft 14, the two transmission gears 13 are driven to rotate, because the transmission gear 13 and the circular tooth 12 are meshed with each other, under the limit of the fixed groove 16 and the rotating block 17, the rotating cavity 8, then the two transmission gears 23 are driven to rotate, the cleaning brush 23, then the dust suction and the dust suction box is designed to process the dust through the dust absorption discharge port 34, then the dust absorption box, the dust absorption discharge port 34, then the dust absorption box is designed to process the dust absorption discharge port of the dust absorption box, the dust absorption discharge port 34, the dust absorption box, the dust absorption discharge motor 34, the dust absorption discharge port 34, the dust absorption box, the dust absorption discharge port 34, the event is under the spacing of dead lever 37 and movable sleeve 38, drives movable frame 35 through driving gear 34 and carries out up-and-down reciprocating motion, and then under expanding spring 31's cooperation, drives sieve 29 and play flitch 30 shake from top to bottom through movable rod 36, because the arc design of sieve 29 for the rubbish piece falls into the inside of screening chamber 28 through sieve 29, and the screw rolls through sieve 29 to the inside of going out flitch 30, then carries out convenient ejection of compact to it.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a screw processing multistation cold heading machine, includes bottom plate (1), its characterized in that: a cold header body (2) is mounted at the top end of the bottom plate (1), a controller (3) is mounted at one side of the top end of the cold header body (2), a feeding hole (4) is mounted at one side of the cold header body (2), a cleaning mechanism is arranged at one side of the feeding hole (4), a discharging hole (5) is mounted at the other side of the cold header body (2), and a screening mechanism is arranged below the discharging hole (5);

clean mechanism is including clean chamber (6), feed port (7), rotatory chamber (8), dust absorption mouth (9), dust storage box (10), dust absorption fan (11) and cleaning brush (23), install in one side of cold heading machine body (2) clean chamber (6), the inside of clean chamber (6) is run through there is feed port (7), the internally mounted of clean chamber (6) has rotatory chamber (8), the inside of rotatory chamber (8) is provided with the removal structure, cleaning brush (23) are installed to the one end of moving mechanism, the outside of rotatory chamber (8) is provided with rotary mechanism, dust absorption mouth (9) are installed to the bottom in clean chamber (6), install in the top of bottom plate (1) one side dust storage box (10), dust absorption fan (11) are installed to one side of dust storage box (10), the one end of dust storage box (10) is linked together through the one end of pipeline with dust absorption mouth (9).

2. The screw processing multi-station cold heading machine according to claim 1, wherein: rotary mechanism includes circular tooth (12), drive gear (13), transmission shaft (14), first servo motor (15), worm (39), worm wheel (40) and spacing subassembly, circular tooth (12) set up in the both ends in rotatory chamber (8) outside, the both sides in clean chamber (6) inside bottom are installed in drive gear (13), intermeshing between circular tooth (12) and drive gear (13), transmission shaft (14) are installed to the inboard of drive gear (13), worm wheel (40) are installed to one side of drive gear (13), the front end meshing of worm wheel (40) has worm (39), install in the bottom in clean chamber (6) first servo motor (15), the output of first servo motor (15) is connected with the one end of worm (39).

3. The screw processing multi-station cold heading machine according to claim 2, wherein: spacing subassembly includes fixed slot (16) and commentaries on classics piece (17), fixed slot (16) set up in the inside both sides in clean chamber (6), the internally mounted of fixed slot (16) has commentaries on classics piece (17), the one end of commentaries on classics piece (17) is connected with the one end in rotatory chamber (8).

4. The screw machining multi-station cold header as claimed in claim 3, wherein: the inner diameter of the fixing groove (16) is larger than the outer diameter of the rotating block (17), and a rotating structure is formed between the fixing groove (16) and the rotating block (17).

5. The screw processing multi-station cold heading machine according to claim 4, wherein: the mechanism includes installation cavity (18), second servo motor (19), threaded rod (20), thread bush (21), hinged rod (22), gag lever post (24), stop collar (25) and direction subassembly, install in rotatory cavity (8) inboard top and bottom installation cavity (18), second servo motor (19) are installed to one side of installation cavity (18), threaded rod (20) are installed to the inside below of second servo motor (19), the output of second servo motor (19) is connected with the one end of threaded rod (20), the screw thread opposite direction at threaded rod (20) both ends, the lateral wall symmetry of threaded rod (20) is provided with thread bush (21), the bottom of thread bush (21) articulates there is hinged rod (22), the bottom of hinged rod (22) is articulated each other with the top of cleaning brush (23), gag lever post (24) are installed to the inside top of installation cavity (18), the lateral wall symmetry of gag lever post (24) is provided with stop collar (25), the bottom of stop collar (25) is connected with the top of thread bush (21).

6. The screw processing multi-station cold heading machine according to claim 5, wherein: the direction subassembly includes guide bar (26) and uide bushing (27), install in the top and the below of rotatory chamber (8) inner wall guide bar (26), the lateral wall of guide bar (26) is provided with uide bushing (27), the one end of uide bushing (27) is connected with the one end of cleaning brush (23).

7. The screw machining multi-station cold header as claimed in claim 1, wherein: screening mechanism is including screening chamber (28), sieve (29), play flitch (30), expanding spring (31) and power unit, install in the below of discharge gate (5) screening chamber (28), the inside in screening chamber (28) sets up in the inside of sieve (29), play flitch (30) are installed at the both ends of sieve (29), the one end that goes out flitch (30) extends in the outside of screening chamber (28), install expanding spring (31) on the inner wall in screening chamber (28), the top of expanding spring (31) is connected with the bottom that goes out flitch (30).

8. The screw processing multi-station cold heading machine according to claim 7, wherein: power unit includes fixed chamber (32), third servo motor (33), driving gear (34), movable frame (35), movable rod (36), dead lever (37) and movable sleeve (38), install in the both sides of screening chamber (28) fixed chamber (32), third servo motor (33) are installed to the one end of fixed chamber (32), the internally mounted of fixed chamber (32) has driving gear (34), the output of third servo motor (33) is connected with the one end of driving gear (34), the lateral wall of driving gear (34) is provided with movable frame (35), the inside both sides of movable frame (35) are provided with the driving rack, driving gear (34) and the inboard intermeshing of movable frame (35), movable rod (36) are installed on the top of movable frame (35), the one end of movable rod (36) extends to the outside of fixed chamber (32), the top of movable rod (36) is connected with the bottom of play flitch (30), dead lever (37) is installed to the inside one side of fixed chamber (32), the lateral wall of dead lever (37) is provided with movable sleeve (38), the one end of movable sleeve (38) is connected with the movable sleeve (35).