CN110836587A

CN110836587A - General type drying machinery equipment for granular materials

Info

Publication number: CN110836587A
Application number: CN201911158227.8A
Authority: CN
Inventors: 贾伟伟; 康健
Original assignee: Yandu Xicheng Trade Co Ltd
Current assignee: Yandu Xicheng Trade Co Ltd
Priority date: 2019-11-22
Filing date: 2019-11-22
Publication date: 2020-02-25

Abstract

The invention discloses universal drying mechanical equipment for granular substances, which comprises a mounting seat, a drying cavity, a heat insulation assembly, two groups of heating assemblies, a rotating assembly, three groups of material guide assemblies and a conveying assembly, wherein the drying cavity is fixedly arranged above the mounting seat through a support, the top end of the drying cavity is provided with a feed hopper, the center of the bottom end of the drying cavity is provided with a discharge pipe, and the end of the discharge pipe is provided with a control valve. The drying device comprises a drying cavity, a heat insulation cavity, three groups of material guide assemblies, three groups of sieve plates, a heat insulation cavity, a rotary bin, a drying cavity, a heat insulation plate and a rotary bin, wherein the drying cavity is arranged in the drying cavity, the heat insulation cavity is sleeved outside the drying cavity, the overall utilization rate of energy is improved, the three groups of material guide assemblies are arranged inside the rotary bin, raw materials can be uniformly graded.

Description

General type drying machinery equipment for granular materials

Technical Field

The invention relates to the technical field of drying equipment, in particular to universal drying mechanical equipment for granular substances.

Background

Drying equipment is through certain technological means, the combination of a series of mechanical equipment of moisture or other liquid on dry object surface, the drying technology that is popular at present mainly is ultraviolet stoving, infrared stoving, electromagnetism stoving and hot-blast stoving, they are distinctive, the wide application is in the stoving of various mechanical equipment and food, drying equipment need dry different article simultaneously, and traditional stoving processing, the form such as mostly adopt hot-blast direction stoving is accomplished, but traditional device does not possess the heat preservation and handles mostly, and can't effectively carry out fine cyclic utilization processing to the heat, consequently, the waste of the energy has been increased, overall utilization is lower.

The conventional device has the following disadvantages: traditional drying process, the form such as mostly adopt hot-blast direction stoving is accomplished, but traditional device does not possess the heat preservation greatly and handles, and can't effectively carry out fine cyclic utilization to the heat and handle, consequently increased the waste of the energy, overall utilization is lower, traditional drying device simultaneously, the material very easily takes place accumulational situation and takes place, can't be quick separate the stoving to the material and handle, whole stoving effect has been reduced, and the comprehensiveness and the degree of consistency of drying are not high.

Disclosure of Invention

The invention aims to provide universal drying mechanical equipment for granular materials, which aims to solve the problems that most of the traditional drying treatment is finished in the form of hot air guide drying and the like, but most of the traditional devices do not have heat preservation treatment and cannot effectively recycle heat, so that the waste of energy is increased, the overall utilization rate is low, and meanwhile, the traditional drying device is easy to accumulate materials.

In order to achieve the purpose, the invention provides the following technical scheme: a universal drying mechanism for granular materials, comprising: mount pad, stoving chamber, heat preservation subassembly, two sets of heating element, rotating assembly, three guide subassemblies of group and conveying assembly, the stoving chamber passes through the fixed setting of support in the mount pad top, the feeder hopper has been seted up on stoving chamber top, the bottom center department in stoving chamber installs row's material pipe, and arranges the end department of material pipe and install control flap, the heat preservation subassembly cover is established outside the stoving chamber, and is two sets of heating element matches and installs in the outside both sides in stoving chamber, rotating assembly installs in the stoving intracavity portion, and three guide subassemblies of group match inside the installation rotating assembly, conveying assembly's both ends and feeder hopper, rotating assembly intercommunication.

Preferably, the heat preservation subassembly includes heat preservation chamber, two sets of stand pipes and blast pipe, heat preservation chamber cover is established outside the stoving chamber, and is two sets of the stand pipe is installed in stoving chamber top both sides, and is two sets of the other end of stand pipe passes stoving chamber and the inside intercommunication of heat preservation chamber, the blast pipe is installed in heat preservation chamber bottom one side, and the gaseous direction that can be stable use the stoving intracavity portion to accomplish is used for whole heat preservation to the heat preservation intracavity portion and is handled, has improved the overall utilization ratio of the energy, has avoidd the waste of the energy.

Preferably, the heat preservation cushion layer is installed on the inner wall of the heat preservation cavity in a laminating mode, and the heat preservation cavity is sleeved outside the drying cavity in a laminating mode.

Preferably, it is two sets of heating element installs in stoving chamber both sides, and is two sets of heating element all includes heater, conveyer pipe and aspiration pump, the heater is installed at stoving chamber both sides wall, the one end and the heater intercommunication of conveyer pipe, the other end of conveyer pipe extends to stoving intracavity portion, the end department at the conveyer pipe is installed to the aspiration pump.

Preferably, rotating assembly includes driving motor, drive gear and rotary bin, driving motor installs on the inside top of stoving chamber, rotary bin end department and stoving intracavity wall sliding connection, the top extension department and the feeder hopper intercommunication in rotary bin, the drive gear cover is established on rotary bin top, and driving motor's output is connected with drive gear meshing through the installation gear, the other end and the inside intercommunication in rotary bin of conveyer pipe, rotary bin's bottom and row's material pipe intercommunication, and rotary bin bottom adopt arcuation transition treatment.

Preferably, three groups the guide subassembly is from top to bottom evenly distributed inside rotatory storehouse, three groups the guide subassembly all includes sieve, hot plate, evenly seted up a plurality of groups on the sieve and run through the guide through-hole, the both ends and the laminating of rotatory storehouse inner wall of sieve are connected, the hot plate inlays the inside of establishing at the sieve, and the hot plate all is connected with external power supply through the wire, utilizes under the dislocation installation of a guiding mechanism, No. two guiding mechanisms, utilizes the deflector can cushion the direction processing to the material, has avoided the situation that material and the direct rigid contact of rotatory storehouse inner wall caused the damage to take place.

Preferably, the sizes of the through material guiding through holes of the sieve plates in the three material guiding assemblies are different, and the sizes of the through material guiding through holes of the sieve plates of the three material guiding assemblies are gradually reduced from top to bottom.

Preferably, conveying component comprises a plurality of guide mechanism of group, a plurality of guide mechanism of group two, and is a plurality of guide mechanism, No. two guide mechanism all match and install in rotatory storehouse top inner wall both sides, and a plurality of guide mechanism of group, No. two guide mechanism are the dislocation installation, a plurality of groups guide mechanism, No. two guide mechanism all include deflector, locating piece and reset spring, the fixed setting of locating piece is at rotatory storehouse top inner wall, the end department of deflector passes through hinge and rotatory storehouse inner wall swing joint, reset spring installs and is used for the elastic guidance to handle between locating piece, deflector.

Preferably, still including the clearance subassembly, the clearance subassembly matches and installs on three guide subassemblies of group, the clearance subassembly includes clearance piece, No. two clearance pieces, stay cord and balancing weight, clearance piece, No. two clearance piece slip cap respectively establish at the sieve both ends, and the both ends of stay cord are connected with clearance piece, No. two clearance pieces respectively, the balancing weight is installed on the stay cord to can carry out the propelling movement to the raw materials of sieve, avoid the jam of raw materials, avoid the accumulational situation of raw materials simultaneously, improve whole drying efficiency.

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

1. according to the invention, the heat insulation assembly is arranged, the heat insulation cavity is sleeved outside the drying cavity, so that the rapid loss of heat is avoided, the gas used and finished in the drying cavity can be stably guided into the heat insulation cavity for integral heat insulation treatment under the action of the two groups of guide pipes, the integral utilization rate of energy is improved, the waste of energy is avoided, energy is saved, the environment is protected, then the raw material enters the rotary bin, meanwhile, the rotary bin can be stably driven by the driving motor to synchronously rotate along the inner wall of the drying cavity through the rotation assembly, and the moisture of the raw material can be preliminarily dried through centrifugal treatment, so that the comprehensiveness of subsequent integral treatment is ensured;

2. according to the invention, three groups of material guide assemblies are arranged in the rotary bin, raw materials can be uniformly graded by using the three groups of material guide assemblies, the contact area between the raw materials and the sieve plates is increased, meanwhile, the raw materials can be further heated and dried by arranging the heating plate in the sieve plates, the integral effect and drying comprehensiveness of the device are improved, meanwhile, the raw materials can be stably separated on each sieve plate by virtue of different sizes of the sieve plates of the three groups of material guide assemblies, meanwhile, under the rotating action of the rotary bin, the integral drying effect is accelerated, and the situations of material accumulation and uneven heating in the traditional drying mode are avoided;

3. the cleaning assembly is arranged, the balancing weight can be stably driven to move downwards in the rotating process of the rotating bin, so that the first cleaning block and the second cleaning block at two ends of the sieve plate can be stably driven to move, the raw materials of the sieve plate can be pushed, the blockage of the raw materials is avoided, the situation of raw material accumulation is avoided, the overall drying efficiency is improved, the conveying assembly is arranged, the first guide mechanism and the second guide mechanism are arranged in a staggered mode, the guide plate can be used for buffering and guiding the materials, the situation that the materials are directly and rigidly contacted with the inner wall of the rotating bin to cause damage is avoided, meanwhile, the guide plate can be elastically guided under the action of the reset spring, and the stable effect of overall raw material conveying is guaranteed.

Drawings

FIG. 1 is a front view of a general drying machine for granular materials;

FIG. 2 is a schematic structural diagram of a heat-insulating assembly of a general drying mechanical device for granular substances;

FIG. 3 is a schematic view of a rotating assembly of a general drying machine for granular materials;

FIG. 4 is a schematic view of a material guiding assembly of a general drying machine for granular materials;

FIG. 5 is a schematic structural diagram of a conveying assembly of a universal drying machine for granular materials;

FIG. 6 is a schematic structural diagram of a cleaning assembly of a general drying machinery for granular materials;

fig. 7 is an enlarged schematic view of a general drying mechanism for granular substances at a position a in fig. 3.

In the figure: 1. a mounting seat; 2. a drying bin; 3. a feed hopper; 4. a discharge pipe; 5. a control valve; 6. a heat preservation cavity; 7. a guide tube; 8. an exhaust pipe; 9. a heater; 10. a delivery pipe; 11. an air pump; 12. a drive motor; 13. a drive gear; 14. rotating the bin; 15. a sieve plate; 16. heating plates; 17. a second guide mechanism; 18. a guide plate; 19. positioning blocks; 20. a return spring; 21. a first cleaning block; 22. a second cleaning block; 23. pulling a rope; 24. a balancing weight; 25. a first guide mechanism.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

Referring to fig. 1-7, the present invention provides a technical solution: a universal drying mechanism for granular materials, comprising: mount pad 1, stoving chamber 2, insulating assembly, two sets of heating element, rotating assembly, three guide subassemblies of group and conveying assembly, stoving chamber 2 passes through the fixed setting in 1 top of mount pad through the support, feeder hopper 3 has been seted up on 2 tops in the stoving chamber, the bottom center department in stoving chamber 2 installs row material pipe 4, and arranges the end department of material pipe 4 and install control flap 5, the insulating assembly cover is established in 2 outsides in stoving chamber, and is two sets of heating element matches and installs in 2 outside both sides in stoving chamber, rotating assembly installs in stoving chamber 2 insidely, and three guide subassemblies of group match inside the installation rotating assembly, conveying assembly's both ends and feeder hopper 3, rotating assembly intercommunication.

According to the invention, the heat preservation assembly comprises a heat preservation cavity 6, two groups of guide pipes 7 and an exhaust pipe 8, the heat preservation cavity 6 is sleeved outside the drying cavity 2, the two groups of guide pipes 7 are arranged on two sides of the top end of the drying cavity 2, the other ends of the two groups of guide pipes 7 penetrate through the drying cavity 2 and are communicated with the inside of the heat preservation cavity 6, the exhaust pipe 8 is arranged on one side of the bottom end of the heat preservation cavity 6, the heat preservation cavity 6 is sleeved outside the drying cavity 2, rapid heat loss is avoided, meanwhile, under the action of the two groups of guide pipes 7, gas used and finished in the drying cavity 2 can be stably guided into the heat preservation cavity 6 for integral heat preservation treatment, the integral utilization rate of energy is improved, energy waste is avoided, energy is saved, environment is protected.

In the invention, the inner wall of the heat preservation cavity 6 is provided with a heat preservation cushion layer in a fitting manner, and the heat preservation cavity 6 is sleeved outside the drying cavity 2 in a fitting manner.

In the invention, two groups of heating assemblies are arranged at two sides of a drying cavity 2, each group of heating assemblies comprises a heater 9, a conveying pipe 10 and an air suction pump 11, the heaters 9 are arranged at two side walls of the drying cavity 2, one end of the conveying pipe 10 is communicated with the heater 9, the other end of the conveying pipe 10 extends into the drying cavity 2, and the air suction pump 11 is arranged at the end of the conveying pipe 10.

Preferably, the rotating assembly includes a driving motor 12, a driving gear 13 and a rotary bin 14, the driving motor 12 is arranged at the top end inside the drying cavity 2, the end of the rotary bin 14 is connected with the inner wall of the drying cavity 2 in a sliding way, the top end of the rotary bin 14 is extended and communicated with the feed hopper 3, the driving gear 13 is sleeved at the top end of the rotary bin 14, the output end of the driving motor 12 is engaged with the driving gear 13 through a mounting gear, the other end of the conveying pipe 10 is communicated with the inside of the rotary bin 14, the bottom end of the rotary bin 14 is communicated with the discharging pipe 4, the bottom end of the rotary bin 14 adopts arc transition treatment, the driving motor 12 can stably drive the rotary bin 14 to synchronously rotate along the inner wall of the drying cavity 2, and through centrifugal treatment, the moisture of the raw materials can be preliminarily dried, and the comprehensiveness of the subsequent overall treatment is ensured.

Preferably, three guide assemblies are uniformly distributed inside the rotary bin 14 from top to bottom, each guide assembly comprises a sieve plate 15 and a heating plate 16, the sieve plate 15 is uniformly provided with a plurality of guide through holes, two ends of the sieve plate 15 are connected with the inner wall of the rotary bin 14 in a fitting manner, the heating plate 16 is embedded inside the sieve plate 15, the heating plate 16 is connected with an external power supply through a wire, the three guide assemblies are utilized to uniformly classify the raw materials, the contact area between the raw materials and the sieve plate 15 is increased, meanwhile, the heating plate 16 is arranged inside the sieve plate 15, the raw materials can be further heated and dried, the integral effect and drying comprehensiveness of the device are improved, meanwhile, the sieve plates 15 with the three guide assemblies are different in size, the raw materials can be stably separated on the sieve plates 15, and under the rotation action of the rotary bin 14, the effect of whole stoving has been accelerateed, and the material that has avoidd traditional drying methods is piled up, the inhomogeneous situation of being heated takes place.

Preferably, the sizes of the through material guiding through holes of the sieve plates 15 in the three groups of material guiding assemblies are different, and the sizes of the through material guiding through holes of the sieve plates 15 in the three groups of material guiding assemblies are gradually reduced from top to bottom.

Preferably, the conveying assembly comprises a plurality of groups of first guide mechanisms 25 and a plurality of groups of second guide mechanisms 17, the plurality of groups of first guide mechanisms 25 and the plurality of groups of second guide mechanisms 17 are all installed on two sides of the inner wall of the top end of the rotary bin 14 in a matching manner, the plurality of groups of first guide mechanisms 25 and the plurality of groups of second guide mechanisms 17 are installed in a staggered manner, the plurality of groups of first guide mechanisms 25 and the plurality of groups of second guide mechanisms 17 all comprise guide plates 18, positioning blocks 19 and reset springs 20, the positioning blocks 19 are fixedly arranged on the inner wall of the top end of the rotary bin 14, the end parts of the guide plates 18 are movably connected with the inner wall of the rotary bin 14 through hinges, the reset springs 20 are installed between the positioning blocks 19 and the guide plates 18 and used for elastic guide treatment, under the staggered installation of the first guide mechanisms 16 and the second guide mechanisms 17, the guide plates 18 can be used for buffering and guiding the materials, and avoiding the situation that the materials are directly and rigidly contacted, meanwhile, under the action of the return spring 20, the guide plate 18 can be subjected to elastic guide treatment, and the stable effect of overall raw material conveying is ensured.

Preferably, the cleaning assembly is installed on three guide assemblies in a matching mode and comprises a first cleaning block 21, a second cleaning block 22, a pull rope 23 and a balancing weight 24, the first cleaning block 21 and the second cleaning block 22 are respectively sleeved at two ends of the sieve plate 15 in a sliding mode, two ends of the pull rope 23 are respectively connected with the first cleaning block 21 and the second cleaning block 22, the balancing weight 24 is installed on the pull rope 23, and in the rotating process of the rotating bin 14, the balancing weight 24 can be stably driven to move downwards, so that the first cleaning block 21 and the second cleaning block 22 at two ends of the sieve plate 15 can be stably driven to move, the raw materials of the sieve plate 15 can be pushed, the blockage of the raw materials is avoided, meanwhile, the situation of raw material accumulation is avoided, and the overall drying efficiency is improved.

The working principle is as follows: firstly, raw materials are conveyed into a drying cavity 2 through a feed hopper 3, two groups of heating group components are arranged, high-temperature gas generated by a heater 9 can be stably conveyed into the drying cavity 2 under the action of a conveying pipe 10 to ensure the overall stable drying effect and improve the overall use effect, meanwhile, through arranging the heat insulation component, the heat insulation cavity 6 is sleeved outside the drying cavity 2, the heat insulation treatment can be effectively carried out on the drying cavity 2, the rapid loss of heat is avoided, the overall drying speed is improved, meanwhile, under the action of two groups of guide pipes 7, the gas used and finished in the drying cavity 2 can be stably guided into the heat insulation cavity 6 for the overall heat insulation treatment, the overall utilization rate of energy is improved, the waste of energy is avoided, the energy is saved, the environment is protected, then the raw materials enter a rotary bin 14, and meanwhile, through arranging the rotary component, the driving motor 12 is started, thereby the driving rotary bin 14 which can be stable can carry out synchronous rotation work along the inner wall of the drying cavity 2, through centrifugal processing, the moisture of the raw material can be preliminarily dried, the comprehensiveness of the subsequent integral processing is ensured, meanwhile, three groups of material guide assemblies are arranged in the rotary bin 14, the raw material can be uniformly graded by utilizing the three groups of material guide assemblies, the contact area of the raw material and the sieve plates 15 is increased, meanwhile, the raw material can be further heated and dried by arranging the heating plate 16 in the sieve plates 15, the integral effect and the drying comprehensiveness of the device are improved, meanwhile, the sieve plates 15 of the three groups of material guide assemblies are different in size, the raw material can be stably separated on each sieve plate 15, meanwhile, under the rotation effect of the rotary bin 14, the integral drying effect is accelerated, the material accumulation and the traditional drying mode are avoided, Inhomogeneous situation of being heated takes place, simultaneously through being equipped with the clearance subassembly, at rotatory 14 pivoted in-process in storehouse, can be stable drive balancing weight 24 move down, thereby can be stable drive clearance piece 21 at sieve 15 both ends, No. two clearance pieces 22 remove, thereby can carry out the propelling movement to the raw materials of sieve 15, the jam of raw materials has been avoided, the accumulational situation of raw materials has been avoided simultaneously, whole drying efficiency has been improved, simultaneously through being equipped with transport assembly, utilize guiding mechanism 25 No. one, No. two under guiding mechanism 17's dislocation installation, utilize deflector 18 can cushion the direction processing to the material, avoided the situation emergence that material and rotatory 14 inner wall direct rigid contact caused the damage, simultaneously under reset spring 20 effect, can carry out elastic guide processing to deflector 18, whole raw materials transport's stable effect has been guaranteed.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a general type drying machinery equipment of particulate matter, its characterized in that includes mount pad (1), stoving chamber (2), heat preservation subassembly, two sets of heating element, rotating assembly, three groups guide subassembly and conveying assembly, stoving chamber (2) are fixed to be set up in mount pad (1) top through the support, feeder hopper (3) have been seted up on stoving chamber (2) top, the bottom center department of stoving chamber (2) installs row material pipe (4), and arranges the end department of material pipe (4) and install control flap (5), the heat preservation subassembly cover is established in stoving chamber (2) outside, and is two sets of heating element matches and installs in the outside both sides of stoving chamber (2), rotating assembly installs inside stoving chamber (2), and three groups guide subassembly matches and installs inside the rotating assembly, conveying assembly's both ends and feeder hopper (3), The rotating assemblies are in communication.

2. The universal drying machinery equipment for granular materials as claimed in claim 1, wherein: the heat preservation subassembly includes heat preservation chamber (6), two sets of stand pipe (7) and blast pipe (8), heat preservation chamber (6) cover is established outside stoving chamber (2), and is two sets of stand pipe (7) are installed in stoving chamber (2) top both sides, and two sets of the other end of stand pipe (7) passes stoving chamber (2) and the inside intercommunication in heat preservation chamber (6), install in heat preservation chamber (6) bottom one side blast pipe (8).

3. The universal drying machinery equipment for granular materials as claimed in claim 1, wherein: the inner wall of the heat preservation cavity (6) is provided with a heat preservation cushion layer in a fitting mode, and the heat preservation cavity (6) is sleeved outside the drying cavity (2) in a fitting mode.

4. The universal drying machinery equipment for granular materials as claimed in claim 1, wherein: two sets of heating element installs in stoving chamber (2) both sides, and is two sets of heating element all includes heater (9), conveyer pipe (10) and aspiration pump (11), install at stoving chamber (2) both sides wall heater (9), the one end and the heater (9) intercommunication of conveyer pipe (10), the other end of conveyer pipe (10) extends to inside stoving chamber (2), the end department at conveyer pipe (10) is installed in aspiration pump (11).

5. The universal drying machinery equipment for granular materials as claimed in claim 1, wherein: rotating assembly includes driving motor (12), drive gear (13) and rotary bin (14), install on stoving chamber (2) inside top driving motor (12), rotary bin (14) end department and stoving chamber (2) inner wall sliding connection, the top of rotary bin (14) extends department and feeder hopper (3) intercommunication, drive gear (13) cover is established on rotary bin (14) top, and the output of driving motor (12) is connected with drive gear (13) meshing through the installation gear, the other end and the inside intercommunication in rotary bin (14) of conveyer pipe (10), the bottom and the row of rotary bin (14) expect pipe (4) intercommunication, and rotary bin (14) bottom adopts the arcuation transition to handle.

6. The universal drying machinery equipment for granular materials as claimed in claim 1, wherein: three groups the guide subassembly from top to bottom evenly distributed is inside rotatory storehouse (14), three groups the guide subassembly all includes sieve (15), hot plate (16), evenly seted up a plurality of groups on sieve (15) and run through the guide through-hole, the both ends and the laminating of rotatory storehouse (14) inner wall of sieve (15) are connected, hot plate (16) inlay the inside of establishing at sieve (15), and hot plate (16) all are connected with external power supply through the wire.

7. The universal drying machinery equipment for granular substances according to claim 6, wherein: the sizes of the through guide through holes of the sieve plates (15) in the guide assemblies are different, and the sizes of the through guide through holes of the sieve plates (15) in the guide assemblies are gradually reduced from top to bottom.

8. The universal drying machinery equipment for granular materials as claimed in claim 1, wherein: conveying assembly comprises a plurality of guide mechanism (25), No. two guide mechanism (17) of a plurality of groups, and is a plurality of guide mechanism (25), No. two guide mechanism (17) all match and install in rotatory storehouse (14) top inner wall both sides, and a plurality of groups guide mechanism (25), No. two guide mechanism (17) are the dislocation installation, a plurality of groups guide mechanism (25), No. two guide mechanism (17) all include deflector (18), locating piece (19) and reset spring (20), locating piece (19) are fixed to be set up at rotatory storehouse (14) top inner wall, the end department of deflector (18) passes through hinge and rotatory storehouse (14) inner wall swing joint, reset spring (20) are installed and are used for the elastic guidance to handle between locating piece (19), deflector (18).

9. The universal drying machinery equipment for granular materials as claimed in claim 1, wherein: still include the clearance subassembly, the clearance subassembly matches and installs on three guide subassemblies of group, the clearance subassembly includes clearance piece (21), No. two clearance pieces (22), stay cord (23) and balancing weight (24), clearance piece (21), No. two clearance pieces (22) slip cap respectively establish at sieve (15) both ends, and the both ends of stay cord (23) are connected with clearance piece (21), No. two clearance pieces (22) respectively, balancing weight (24) are installed on stay cord (23).