CN116371730A - Sieving mechanism is used in ejection of compact of silicon nitride granulation - Google Patents

Abstract

The invention relates to the technical field of silicon nitride manufacturing instruments, and provides a screening device for silicon nitride granulation discharging, which comprises: the screening box body, the base, the first screening mechanism, the second screening mechanism and the material returning device; the screening box body is fixedly arranged at the upper end of the base, a first screening mechanism is arranged in the screening box body, and a second screening mechanism is arranged below the first screening mechanism; the screening box body is connected with a feed back device; the screening box left side outer wall is equipped with actuating mechanism, the actuating mechanism right side is connected with screening net vibrating device, and screening net vibrating device is used for vibrating first screening mechanism and second screening mechanism. The invention is beneficial to multilayer fine screening of the silicon nitride particles, can effectively screen the silicon nitride particles for multiple rounds, and reduces the waste of the silicon nitride particles.

Description

Sieving mechanism is used in ejection of compact of silicon nitride granulation

Technical Field

The invention relates to the technical field of silicon nitride manufacturing instruments, in particular to a screening device for granulating and discharging silicon nitride.

Background

Silicon nitride has a molecular formula of Si3N4, belongs to a compound combined by covalent bonds, has higher mechanical strength, has smaller friction coefficient, and has smaller friction coefficient improvement range under the conditions of high temperature and high speed; the silicon nitride ceramics can reach the required shape and precision and surface finish by a mechanical processing mode; high mechanical strength and hardness close to corundum. The room temperature bending strength of the hot pressed silicon nitride can be up to 780-980 MPa, some are even higher, compared with alloy steel, and the strength can be kept to 1200 ℃ all the time without reduction.

The silicon nitride granulation ejection of compact can be through sieving mechanism screening generally, and current silicon nitride granulation ejection of compact is with sieving mechanism has following problem:

1. typically, only once, some of the acceptable silicon nitride particles fail to pass through the screen quickly due to material accumulation, resulting in sorting of the portion of acceptable silicon nitride particles into scrap, thereby creating waste;

2. after the materials screened by the screening device are collected, the materials need to be manually poured into the screening device, so that the labor intensity is high;

3. when the silicon nitride particles enter the screening device and vibrate, the surface of the silicon nitride particles can be wrapped with a layer of dust and the like (when part of the silicon nitride particles are stained with dust in the transportation process or dust exists in the screening mechanism, more silicon nitride particles are stained with dust in the vibration screening process), and the surface smoothness and the using effect of the silicon nitride particles can be affected.

Disclosure of Invention

The invention provides a screening device for silicon nitride granulation and discharge, which is used for solving at least one of the problems set forth in the background art.

A sieving mechanism for silicon nitride granulation ejection of compact, includes: the screening box body, the base, the first screening mechanism, the second screening mechanism and the material returning device;

the screening box body is fixedly arranged at the upper end of the base, a first screening mechanism is arranged in the screening box body, and a second screening mechanism is arranged below the first screening mechanism;

The screening box body is connected with a feed back device.

Preferably, a feed inlet is formed in the top of the screening box body, and a feed hopper is fixedly arranged at the feed inlet.

Optionally, the first screening mechanism includes: the device comprises a coarse screening net, a vertical sliding sleeve, a protection plate, a vertical sliding rod, a first spring, a first support and a guide inclined plate;

the screening box body is characterized in that a first bracket is symmetrically arranged at the left and right of the inner top of the screening box body and fixedly connected with the inner walls of the left side and the right side of the screening box body; a first spring is fixedly arranged below the bracket; a coarse screening net is arranged below the spring and connected with the first spring;

the left end of the coarse screening net is provided with a vertical sliding sleeve symmetrically in front-back direction, and the vertical sliding sleeve is fixedly connected with the left end face of the coarse screening net; the left upper end face of the coarse screening net is fixedly provided with a protection plate which is vertically connected with the upper end face of the coarse screening net; the right side of the coarse screening net is fixedly connected with a material guiding inclined plate; the lower end of the coarse screening net is connected with a material guiding funnel;

a vertical sliding rod corresponding to the vertical sliding sleeve is arranged on the left inner wall of the screening box body; the vertical sliding sleeve is in sliding connection with the vertical sliding rod along the vertical direction.

Optionally, the second screening mechanism includes: the device comprises a first mounting plate, a second mounting plate, a first sliding rod, a second spring, a second sliding rod, a third spring, a middle screening net and an inclined screening net;

The screening box body is characterized in that a first mounting plate is arranged on the left wall inside the screening box body and fixedly connected to the front-rear center of the left wall of the screening box body;

the center of the first mounting plate is provided with a first sliding rod which penetrates through the first mounting plate in a sliding manner along the vertical direction, the outer surface of the first sliding rod is sleeved with a second spring, a middle screening net is arranged below the sliding rod, the lower end of the sliding rod is hinged with the upper end face of the left side of the middle screening net, and the second spring is fixedly connected with the first mounting plate and the sliding rod;

the screening box body is characterized in that a second mounting plate is arranged on the right wall inside the screening box body and fixedly connected to the front-rear center of the right wall of the screening box body; the mounting plate is positioned below the middle screening net;

the second center of the mounting plate is provided with a second sliding rod, the second sliding rod penetrates through the second mounting plate in a sliding manner along the vertical direction, a third spring is sleeved on the outer surface of the sliding rod, the third spring is fixedly connected with the second mounting plate and the second sliding rod, and the second end of the sliding rod is hinged with the right lower end of the middle screening net; an inclined screening net (17) is arranged below the middle screening net and is fixedly connected with the inner wall of the screening box body.

Preferably, a driving connection port is arranged in the middle of the left wall of the screening box body; a stirring roller is arranged below the feeding funnel and is rotationally connected with the front wall and the rear wall of the screening box body; the rear end of the stirring roller is connected with a first chain wheel which is positioned at the outer side of the rear end of the screening box body; the screening box comprises a screening box body, wherein a screening net vibrating device is arranged on the outer wall of the left side of the screening box body, and the screening net vibrating device is connected to the right side of the driving mechanism and used for vibrating a first screening mechanism and a second screening mechanism;

The driving mechanism includes: the driving box body, the driving motor I, the driving shaft I, the belt pulley I, the bevel gear II, the bevel gear III, the bevel gear IV and the driving shaft II;

the outer wall of the left side of the screening box body is fixedly connected with a driving box body, and the driving box body is communicated with the screening box body through a driving connection port;

the driving box body is internally provided with a driving motor I, and a belt wheel I and a bevel gear I are sequentially arranged at intervals in the front-rear direction of an output shaft of the driving motor I; a bevel gear II is meshed above the bevel gear I; the top end of the bevel gear II is fixedly provided with a transmission shaft I in the vertical direction, and the transmission shaft I is rotationally connected with a baffle plate in the driving box body;

the top of the transmission shaft I is fixedly provided with a bevel gear III, and the right side of the bevel gear III is connected with a bevel gear IV in a meshed manner;

the four right ends of the bevel gears are fixedly provided with a transmission shaft II, the transmission shaft II penetrates through the left wall of the screening box body along the left-right direction, and the transmission shaft II is rotationally connected with the left wall and the right wall of the screening box body.

Preferably, the screen mesh vibration device includes: a first vibration mechanism and a second vibration mechanism;

the drive box is internally provided with a first vibrating mechanism, and the first vibrating mechanism comprises: the device comprises a first baffle plate, a rotary support, a third transmission shaft, a fourth belt pulley, a second belt, a first cam, a push rod base, a track groove, a third push rod and a fourth spring;

The inner wall of the right end of the driving box body is provided with a first partition board which is positioned at the left side of the driving connecting port; a rotary support is arranged below the partition plate and fixedly connected with the bottom of the driving box body;

the rotary support is rotationally connected with a transmission shaft III in the front-rear direction, the front end and the rear end of the transmission shaft III are respectively provided with a belt wheel IV and a cam I, and a belt II is connected between the belt wheel IV and the belt wheel I;

a push rod base is arranged above the first cam, and a track groove is formed in the bottom of the push rod base; the first cam is embedded in the track groove; the upper part of the push rod base is fixedly connected with a push rod III, the push rod III penetrates through the first partition board in a sliding manner along the up-down direction, a spring IV is sleeved outside the push rod III, and the upper end and the lower end of the spring IV are respectively fixedly connected with the first partition board and the push rod base; the push rod is propped against the bottom of the middle screening net;

the first screening mechanism below is equipped with second vibration mechanism, and second vibration mechanism includes: bevel gear five, bevel gear six, cam two, connecting axle, sprocket two;

a pair of bevel gears V are arranged on the transmission shaft II at left and right intervals; a connecting shaft in the front-rear direction is arranged above the bevel gear five, and the connecting shafts are arranged in two at left-right intervals and are rotationally connected with the front wall and the rear wall of the screening box body; the connecting shaft is provided with a second cam symmetrically in front and back; the second cam is contacted with the lower end of the upper coarse screening net; a bevel gear six is arranged in the middle of the connecting shaft; the bevel gear six is in meshed connection with the bevel gear five; the rear end of the left connecting shaft is connected with a second chain wheel, and chain transmission is carried out between the second chain wheel and the first chain wheel.

Preferably, the feeding back device comprises: the device comprises a feed back groove, a spiral blade shaft, a conveying pipe, a belt pulley II, a servo motor II, a belt I, a belt pulley III, a rotating shaft, an inclined pipe I, an inclined pipe II, a discharge pipe and an electric butterfly valve;

a return trough is arranged below the right side of the inclined screening net, and the bottom of the return trough is fixedly connected with the bottom end inside the screening box body; a conveying pipe is arranged on the right outer side of the screening box body, and the bottom of the conveying pipe is connected with the base;

the right side of the return chute is provided with a first inclined pipe which is communicated with the right end of the return chute and a feed inlet communicated with the bottom of the conveying pipe, a discharge pipe is connected to the lower part of the inclined pipe, and an electric butterfly valve is arranged on the discharge pipe; an inclined tube II is arranged between the top of the conveying tube and the feeding funnel, and the inclined tube II is communicated with a discharge hole of the conveying tube and the feeding funnel;

the inside of the conveying pipe is provided with a spiral blade shaft in the vertical direction, and the spiral blade shaft is rotationally connected with the conveying pipe; the bottom end of the spiral blade shaft is provided with a belt pulley II; a second servo motor is arranged on the right side of the conveying pipe, an output shaft of the second servo motor penetrates through the top wall of the base, a rotating shaft is connected below the output shaft of the second servo motor, and the rotating shaft penetrates through the upper wall of the base; and a belt wheel III is arranged on the rotating shaft, and a belt I is connected between the belt wheel III and the belt wheel II.

Preferably, the inside of the base is hollow, and a belt conveyor in the left-right direction is also arranged in the base; a bevel gear six is arranged at the front side of the roller at the right end of the belt conveyor; the six upper sides of the bevel gears are meshed with a bevel gear seven, and the bevel gear seven is fixedly connected with a second output shaft of the servo motor;

the top of the base and the bottom of the screening box body are provided with discharging funnels; self-locking universal wheels are arranged at four corners of the bottom end of the base; the left end of the base is provided with a discharge hole.

Preferably, the right part of the base is also provided with a particle cleaning and drying device;

the particle cleaning and drying device comprises: the device comprises a bottom plate, a screw rod mounting column, an auxiliary adjusting device, a mounting frame, an annular sleeve, a vertical support plate, a roller screen, a roller cover, a fluted disc, a motor IV, a belt pulley V, a belt pulley VI, a gear shaft, a spur gear II, a water storage tank, an electromagnetic valve, a spray pipe, a waste liquid collecting tank, a sewage pipe, a heating cavity, a heating net, a fan, a hot air pipe and a lifting motor;

a bottom plate is fixedly arranged at the upper end of the right side of the base, an auxiliary adjusting device is connected to the bottom plate, and the working end of the auxiliary adjusting device is connected with a mounting frame;

the left end of the mounting frame is vertically and fixedly provided with a vertical support plate downwards, the right end of the mounting frame is vertically provided with an annular sleeve downwards, and a rotary screen is rotationally arranged in the annular sleeve; a fluted disc is fixedly arranged at the left end of the rotary screen and is in rotary connection with the vertical support plate;

The upper part of the fluted disc is meshed with a second spur gear, the left end of the second spur gear is fixedly connected with a gear shaft, and the gear shaft penetrates through the vertical support plate along the left-right direction; the left end of the gear shaft is connected with a belt pulley V; a motor IV is fixedly arranged at the upper end of the left side of the mounting frame, and the output shaft of the motor IV is connected with a belt wheel six; the belt wheel five and the belt wheel six are driven by a belt;

a water storage tank is arranged at the right side of the motor IV at the upper end of the mounting frame, a spray pipe is communicated below the water storage tank, and the spray pipe is connected with the mounting frame; the spray pipe is provided with an electromagnetic valve; the upper end of the right side of the mounting frame is provided with a fan, and the right end of the fan is communicated with the heating cavity; a heating net is arranged in the heating cavity, and the right end of the heating cavity is communicated with a hot air pipe; the right end of the rotary screen is in threaded connection with a rotary cover; a waste liquid collecting tank is arranged below the roller screen and connected with the upper end surface of the bottom plate; and a drain pipe is arranged at the right end of the bottom of the waste liquid collecting tank.

Optionally, the auxiliary adjusting device includes: the device comprises a lead screw mounting column, a T-shaped chute, an internal thread sliding block, a lifting lead screw, a horizontal supporting arm, a triangular bracket, a horizontal sliding sleeve, a horizontal sliding rod, a limiting block, a linear rack, a first spur gear, a third servo motor and a first connecting rod;

A screw rod mounting column is vertically and fixedly arranged on the left side of the bottom plate, and a lifting screw rod is connected between the upper end and the lower end of the screw rod mounting column in a vibrating manner; the lifting screw rod is connected with an internal thread sliding block through threads; the right end of the internal thread sliding block is connected with a horizontal supporting arm; the top of the screw rod mounting column is provided with a lifting motor, and an output shaft of the lifting motor is connected with the top end of the lifting screw rod; the screw rod mounting column is embedded with a T-shaped chute in the up-down direction, and the left end of the internal thread sliding block is connected in a sliding manner in the T-shaped chute;

the center of the upper end of the horizontal supporting arm is fixedly provided with a triangular bracket, and the top of the triangular bracket is fixedly connected with a horizontal sliding sleeve; a horizontal sliding rod is arranged in the horizontal sliding sleeve in a sliding manner along the left-right direction; a linear rack is fixedly arranged at the bottom of the horizontal sliding rod; a limiting block is arranged at the left end of the horizontal sliding rod;

a servo motor III is fixedly arranged on the front side of the right end of the triangular bracket, and the front and rear output shafts of the servo motor III penetrate through the triangular bracket; the rear end of the three output shafts of the servo motor is connected with a first straight gear which is meshed with the linear rack; the right end of the horizontal sliding rod is hinged with a first connecting rod, and the middle part of the first connecting rod is rotationally connected with the right end of the horizontal supporting arm; and a mounting frame is fixedly connected with the bottom end of the connecting rod.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims thereof as well as the appended drawings.

The technical scheme of the invention is further described in detail through the drawings and the embodiments.

Drawings

The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:

FIG. 1 is a schematic elevational view of the screening apparatus of the present invention;

FIG. 2 is a top cross-sectional view of a second vibration mechanism of the present invention;

FIG. 3 is a left side cross-sectional view of the interior of the drive housing of the present invention;

FIG. 4 is a partial connection structure diagram of a screen mesh according to the present invention;

fig. 5 is a schematic front view of the particle cleaning and drying device of the present invention.

In the figure: 1. screening a box body; 101. a feed inlet; 102. a feed hopper; 103. driving the connection port; 104. a discharge hopper; 105. a stirring roller; 2. a base; 3. coarse screening net; 4. a vertical sliding sleeve; 5. a protection plate; 6. a vertical slide bar; 7. a first spring; 8. a first bracket; 9. a material guiding sloping plate; 10. a first mounting plate; 11. a second mounting plate; 12. a first sliding rod; 13. a second spring; 14. a sliding rod II; 15. a third spring; 16. a middle screening net; 17. a diagonal screen; 18. a driving mechanism; 19. driving the box body; 20. driving a first motor; 21. a transmission shaft I; 22. a belt wheel I; 23. bevel gears I; 24. bevel gears II; 25. bevel gears III; 26. bevel gears IV; 27. a transmission shaft II; 28. a material returning device; 29. a feed back groove; 30. a helical leaf shaft; 31. a delivery tube; 32. a belt wheel II; 33. a servo motor II; 34. a first belt; 35. a belt wheel III; 36. a rotation shaft; 37. a first inclined tube; 38. a second inclined tube; 39. a discharge pipe; 40. a discharge port; 41. an electric butterfly valve; 42. a screen vibrating device; 43. a first partition board; 44. a rotary support; 45. a transmission shaft III; 46. a belt wheel IV; 47. a second belt; 48. a first cam; 49. a push rod base; 50. a track groove; 51. a push rod III; 52. a spring IV; 53. a bevel gear V; 54. a bevel gear six; 55. a second cam; 56. a connecting shaft; 57. a sprocket I; 58. a second chain wheel; 59. a belt conveyor; 60. self-locking universal wheels; 61. a particle cleaning and drying device; 62. a bottom plate; 63. a lead screw mounting column; 64. a T-shaped chute; 65. an internal thread slider; 66. lifting a screw rod; 67. a horizontal support arm; 68. a tripod; 69. a horizontal sliding sleeve; 70. a horizontal slide bar; 71. a limiting block; 72. a linear rack; 73. a spur gear I; 74. a servo motor III; 75. a first connecting rod; 76. a mounting frame; 77. an annular sleeve; 78. a vertical support plate; 79. a drum screen; 80. a drum cover; 81. fluted disc; 82. a fourth motor; 83. fifth belt wheel; 84. a belt wheel six; 85. a gear shaft; 86. a spur gear II; 87. a water storage tank; 88. an electromagnetic valve; 89. a shower pipe; 90. a waste liquid collecting tank; 91. a blow-down pipe; 92. a heating chamber; 93. a heating net; 94. a blower; 95. a hot air pipe; 96. a bevel gear seven; 97. a bevel gear eight; 98. and a lifting motor.

Detailed Description

The preferred embodiments of the present invention will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present invention only, and are not intended to limit the present invention.

In addition, the descriptions of the "first," "second," and the like, herein are for descriptive purposes only and are not intended to be specifically construed as order or sequence, nor are they intended to limit the invention solely for distinguishing between components or operations described in the same technical term, but are not to be construed as indicating or implying any relative importance or order of such features. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, technical solutions and technical features between the embodiments may be combined with each other, but it is necessary to base that a person skilled in the art can implement the combination of technical solutions, when the combination of technical solutions contradicts or cannot be implemented, should be considered that the combination of technical solutions does not exist, and is not within the scope of protection claimed by the present invention.

Embodiment 1, as shown in fig. 1-5, the invention discloses a screening device for silicon nitride granulation discharging, comprising: the screening box 1, the base 2, the first screening mechanism, the second screening mechanism and the material returning device 28;

The screening box body 1 is fixedly arranged at the upper end of the base 2, a first screening mechanism is arranged in the screening box body 1, and a second screening mechanism is arranged below the first screening mechanism;

the screening box 1 is connected with a feed back device 28.

The screening box 1 top is equipped with feed inlet 101, and feed inlet 101 is fixed to be equipped with feed hopper 102.

The working principle and the beneficial effects of the technical scheme are as follows: the silicon nitride particles are poured into a feeding funnel 102 and enter the screening box 1 through a feeding port 101; the silicon nitride particles fall into the first screening mechanism for primary screening, the silicon nitride particles fall into the second screening mechanism for screening under the action of gravity after the primary screening, the silicon nitride particles with qualified size passing through the second screening mechanism are collected, and the silicon nitride particles which do not pass through the second screening mechanism are automatically input into the screening box body 1 through the feed back device 28 for next screening; the screening device for silicon nitride granulation discharging can effectively screen silicon nitride particles for multiple times, and ensures that the silicon nitride particles reaching standards can be screened out to the greatest extent.

The invention screens twice through the first screening mechanism and the second screening mechanism, so that the silicon nitride particles with the size close to the qualified size are screened out firstly through the first screening mechanism and enter the second screening mechanism, and the second screening mechanism is more convenient to screen out the silicon nitride particles with the qualified size.

The invention solves the following problems in the prior art: 1. typically, only once, some of the acceptable silicon nitride particles fail to pass through the screen quickly due to material accumulation, resulting in sorting of the portion of acceptable silicon nitride particles into scrap, thereby creating waste; 2. after the materials screened by the screening device are collected, the materials need to be manually poured into the screening device again, and the labor intensity is high.

Embodiment 2, on the basis of embodiment 1, as shown in fig. 1 and 4, the first screening mechanism includes: the device comprises a coarse screening net 3, a vertical sliding sleeve 4, a protection plate 5, a vertical sliding rod 6, a first spring 7, a first bracket 8 and a guide inclined plate 9;

the left and right symmetry of the inner top of the screening box body 1 is provided with a first bracket 8, and the first bracket 8 is fixedly connected with the inner walls of the left side and the right side of the screening box body 1; a first spring 7 is fixedly arranged below the first bracket 8; a coarse screening net 3 is arranged below the first spring 7, and the coarse screening net 3 is connected with the first spring 7;

the left end of the coarse screening net 3 is provided with a vertical sliding sleeve 4 symmetrically in front-back direction, and the vertical sliding sleeve 4 is fixedly connected with the left end face of the coarse screening net 3; the left upper end face of the coarse screening net 3 is fixedly provided with a protection plate 5, and the protection plate 5 is vertically connected with the upper end face of the coarse screening net 3; the right side of the coarse screening net 3 is fixedly connected with a material guiding inclined plate 9; the lower end of the coarse screening net 3 is fixedly connected with a material guiding funnel;

The inner wall of the left side of the screening box body 1 is provided with a vertical sliding rod 6 corresponding to the vertical sliding sleeve 4; the vertical sliding sleeve 4 is in sliding connection with the vertical sliding rod 6 along the vertical direction.

Preferably, the second screening mechanism includes: a first mounting plate 10, a second mounting plate 11, a first sliding rod 12, a second spring 13, a second sliding rod 14, a third spring 15, a middle screening net 16 and an inclined screening net 17;

the screening box body 1 is characterized in that a first mounting plate 10 is arranged on the left wall inside the screening box body 1, and the first mounting plate 10 is fixedly connected to the center of the left wall of the screening box body 1 in the front-rear direction;

the center of the mounting plate I10 is provided with a sliding rod I12, the sliding rod I12 penetrates through the mounting plate I10 in a sliding manner along the vertical direction, the outer surface of the sliding rod I12 is sleeved with a spring II 13, a middle screening net 16 is arranged below the sliding rod I12, the lower end of the sliding rod I12 is hinged with the upper end face of the left side of the middle screening net 16, and the spring II 13 is fixedly connected with the mounting plate I10 and the sliding rod I12;

the right wall inside the screening box body 1 is provided with a second mounting plate 11, and the second mounting plate 11 is fixedly connected to the center of the right wall of the screening box body 1 in the front-rear direction; the second mounting plate 11 is positioned below the middle screening net 16;

the center of the mounting plate II 11 is provided with a sliding rod II 14, the sliding rod II 14 penetrates through the mounting plate II 11 in a sliding manner along the vertical direction, a spring III 15 is sleeved on the outer surface of the sliding rod II 14, the spring III 15 is fixedly connected with the mounting plate II 11 and the sliding rod II 14, and the top end of the sliding rod II 14 is hinged with the right lower end of the middle screening net 16; an inclined screening net 17 is arranged below the middle screening net 16, and the inclined screening net 17 is fixedly connected with the inner wall of the screening box body 1.

The mesh openings of the coarse screening mesh 3, the middle screening mesh 16 and the inclined screening mesh 17 are sequentially reduced.

The working principle and beneficial effects of the technical scheme are as follows: the silicon nitride particles passing through the coarse screening net 3 pass through the middle screening net 16 and the inclined screening net 17 in sequence for screening, and the silicon nitride particles with qualified final size are collected below the inclined screening net 17; the silicon nitride particles which do not pass through the inclined screening net 17 pass through the material returning device 28 for the second round of screening; the screening accuracy is guaranteed by arranging three layers of screens.

In embodiment 3, on the basis of embodiment 2, as shown in fig. 1, 2 and 3, a driving connection port 103 is provided in the middle of the left wall of the screening box 1; a stirring roller 105 is arranged below the feeding funnel 102, and the stirring roller 105 is rotatably connected with the front wall and the rear wall of the screening box body 1; the rear end of the stirring roller 105 is connected with a first chain wheel 57, and the first chain wheel 57 is positioned on the outer side of the rear end of the screening box body 1; the outer wall of the left side of the screening box body 1 is provided with a driving mechanism 18, and the right side of the driving mechanism 18 is connected with a screening net vibrating device 42 _， The screen vibrating device 42 is used for vibrating the first screening mechanism and the second screening mechanism;

the drive mechanism 18 includes: the driving box 19, the driving motor one 20, the transmission shaft one 21, the belt wheel one 22, the bevel gear one 23, the bevel gear two 24, the bevel gear three 25, the bevel gear four 26 and the transmission shaft two 27;

The outer wall of the left side of the screening box body 1 is fixedly connected with a driving box body 19, and the driving box body 19 is communicated with the screening box body 1 through a driving connection port 103;

a first driving motor 20 is arranged at the bottom in the driving box 19, and a first belt wheel 22 and a first bevel gear 23 are sequentially arranged at intervals in the front-rear direction of an output shaft of the first driving motor 20; a bevel gear II 24 is meshed above the bevel gear I23; the top end of the bevel gear II 24 is fixedly provided with a first transmission shaft 21 in the vertical direction, and the first transmission shaft 21 is rotationally connected with a baffle plate in the driving box 19;

the top of the transmission shaft I21 is fixedly provided with a bevel gear III 25, and the right side of the bevel gear III 25 is connected with a bevel gear IV 26 in a meshed manner;

the right end of the bevel gear IV 26 is fixedly provided with a transmission shaft II 27, the transmission shaft II 27 penetrates through the left wall of the screening box body 1 along the left-right direction, and the transmission shaft II 27 is rotationally connected with the left wall and the right wall of the screening box body 1.

Preferably, the screen vibrating device 42 includes: a first vibration mechanism and a second vibration mechanism;

a first vibration mechanism is arranged in the driving box 19, and the first vibration mechanism comprises: partition plate one 43, rotary support 44, transmission shaft three 45, belt pulley four 46, belt two 47, cam one 48, push rod base 49, track groove 50, push rod three 51, spring four 52;

The inner wall of the right end of the driving box body 19 is provided with a first partition board 43, and the first partition board 43 is positioned at the left side of the driving connection port 103; a rotary support 44 is arranged below the first partition plate 43, and the rotary support 44 is fixedly connected with the bottom of the driving box 19;

the rotary support 44 is rotatably connected with a transmission shaft III 45 in the front-rear direction, the front end and the rear end of the transmission shaft III 45 are respectively provided with a belt wheel IV 46 and a cam I48, and a belt II 47 is connected between the belt wheel IV 46 and the belt wheel I22;

a push rod base 49 is arranged above the first cam 48, and a track groove 50 is arranged at the bottom of the push rod base 49; the first cam 48 is embedded in the track groove 50; a third push rod 51 is fixedly connected above the first push rod base 49, the third push rod 51 penetrates through the first partition plate 43 in a sliding mode along the up-down direction, a fourth spring 52 is sleeved outside the third push rod 51, and the upper end and the lower end of the fourth spring 52 are fixedly connected with the first partition plate 43 and the first push rod base 49 respectively; the third push rod 51 is propped against the bottom of the middle screening net 16;

the first screening mechanism below is equipped with second vibration mechanism, and second vibration mechanism includes: bevel gear five 53, bevel gear six 54, cam two 55, connecting shaft 56, sprocket two 58;

a pair of bevel gears five 53 are arranged on the transmission shaft two 27 at left and right intervals; a connecting shaft 56 in the front-rear direction is arranged above the bevel gear five 53, the connecting shafts 56 are arranged in two at left-right intervals, and the connecting shafts 56 are rotationally connected with the front wall and the rear wall of the screening box body 1; the connecting shaft 56 is provided with a second cam 55 symmetrically in front and back; the second cam 55 is contacted with the lower end of the upper coarse screening net 3; a bevel gear six 54 is arranged in the middle of the connecting shaft 56; the bevel gear six 54 is in meshed connection with the bevel gear five 53; the rear end of the left connecting shaft 56 is connected with a second chain wheel 58, and the second chain wheel 58 and the first chain wheel 57 are in chain transmission.

The working principle of the technical scheme is as follows: the silicon nitride particles are poured into the feeding funnel 102, the first chain wheel 57 rotates to drive the stirring roller 105 to stir materials to the feeding port 101, and the stirring speed is determined by the rotation speed of the first chain wheel 57; the silicon nitride particles enter the screening box body 1 through the feeding port 101; the silicon nitride particles fall into the first screening mechanism for primary screening, and the silicon nitride particles fall into the second screening mechanism under the action of gravity after primary screening;

when the driving mechanism 18 works, the output shaft of the driving motor I20 rotates to drive the belt wheel I22 and the bevel gear I23 to synchronously rotate, the bevel gear I23 is meshed to drive the bevel gear II 24 to rotate, the bevel gear II 24 drives the transmission shaft I21 and the bevel gear III 25 to synchronously rotate, and the bevel gear III 25 drives the bevel gear IV 26 and the transmission shaft II 27 to synchronously rotate; when the first vibration mechanism works, the belt pulley I22 is driven by the belt II 47 to rotate the belt pulley IV 46, and the belt pulley IV 46 rotates to drive the transmission shaft III 45 and the cam I48 to synchronously rotate on the rotary support 44; the first cam 48 slides in the track groove 50 to enable the push rod base 49 and the third push rod 51 to slide up and down synchronously, the third push rod 51 is used for pushing the middle screening net 16, and the fourth spring 52 buffers the impact force of sliding between the third push rod 51 and the first partition plate 43; the push rod III 51 slides up and down reciprocally to drive the middle screening net 16 to vibrate up and down; when the first vibration mechanism works, the transmission shaft II 27 rotates to drive the bevel gear V53 on the transmission shaft II to rotate, and the bevel gear V53 drives the bevel gear V54, the connecting shaft 56 and the cam II 55 to synchronously rotate; the second cam 55 rotates to enable the coarse screening net 3 to vibrate up and down; the connecting shaft 56 on the left side rotates and drives the rear end sprocket II 58 to rotate, and the sprocket II 58 drives the sprocket I57 and the stirring roller 105 to synchronously rotate through a chain;

The coarse screening net 3 vibrates up and down along the vertical sliding sleeve 4, so that qualified silicon nitride particles fall onto the middle screening net 16 for screening, and the other part of silicon nitride particles fall into the material returning device 28 through the material guiding inclined plate 9 under the action of vibration force and gravity; the protection plate 5 prevents the silicon nitride particles from moving to the left when vibrating; the first spring 7 plays a role in supporting and buffering when vibrating; when the middle screening net 16 vibrates up and down, the first sliding rod 12 slides up and down in the first mounting plate 10, the second spring 13 buffers the impact force of the first sliding rod 12 during sliding, the second sliding rod 14 slides back and forth in the second mounting plate 11 in the opposite direction to the first sliding rod 12, and the third spring 15 buffers the vibration impact force of the second sliding rod 14; qualified silicon nitride particles fall onto the inclined screen 17 under the vibration action of the middle screen 16 and finally fall onto the belt conveyor 59; the non-screened silicon nitride particles fall into the right-hand feed back device 28 for a second screening round.

The beneficial effects of the technical scheme are that: the driving mechanism 18 drives the coarse screening net 3 and the middle screening net 16 to vibrate up and down in different modes at the same time, the driving mechanism 18 also drives the stirring roller 105 to rotate, a plurality of mechanisms are driven to operate by the same power source, and the utilization rate of a driving motor is improved.

Embodiment 4, on the basis of any one of embodiments 1 to 3, as shown in fig. 1, the feeding back device 28 includes: the feed back groove 29, the spiral vane shaft 30, the conveying pipe 31, the belt pulley II 32, the servo motor II 33, the belt I34, the belt pulley III 35, the rotating shaft 36, the inclined pipe I37, the inclined pipe II 38, the discharging pipe 39 and the electric butterfly valve 41;

a return chute 29 is arranged below the right side of the inclined screening net 17, and the bottom of the return chute 29 is fixedly connected with the bottom end inside the screening box body 1; a conveying pipe 31 is arranged on the right outer side of the screening box body 1, and the bottom of the conveying pipe 31 is connected with the base 2;

the right side of the return chute 29 is provided with a first inclined pipe 37, the first inclined pipe 37 is communicated with the right end of the return chute 29 and a feed inlet communicated with the bottom of the conveying pipe 31, a discharge pipe 39 is connected below the first inclined pipe 37, and an electric butterfly valve 41 is arranged on the discharge pipe 39; an inclined tube II 38 is arranged between the top of the conveying tube 31 and the feeding funnel 102, and the inclined tube II 38 is communicated with a discharge hole of the conveying tube 31 and the feeding funnel 102;

a vertical spiral blade shaft 30 is arranged in the conveying pipe 31, and the spiral blade shaft 30 is rotatably connected with the conveying pipe 31; the bottom end of the spiral blade shaft 30 is provided with a belt pulley II 32; a second servo motor 33 is arranged on the right side of the conveying pipe 31, an output shaft of the second servo motor 33 penetrates through the top wall of the base 2, a rotating shaft 36 is connected below the output shaft of the second servo motor 33, and the rotating shaft 36 penetrates through the upper wall of the base 2; the rotating shaft 36 is provided with a belt pulley III 35, and a belt I34 is connected between the belt pulley III 35 and the belt pulley II 32.

Preferably, the inside of the base 2 is hollow, and a belt conveyor 59 is further arranged in the base 2 in the left-right direction; the front side of the roller at the right end of the belt conveyor 59 is provided with a bevel gear six 54; the upper part of the bevel gear six 54 is in meshed connection with a bevel gear seven 96, and the bevel gear seven 96 is fixedly connected with the output shaft of the servo motor two 33;

the top of the base 2 and the bottom of the screening box 1 are provided with a discharging funnel 104; the four corners of the bottom end of the base 2 are provided with self-locking universal wheels 60; the left end of the base 2 is provided with a discharge hole 40.

The working principle of the technical scheme is as follows:

the silicon nitride particles which are qualified by the final screening fall onto the belt conveyor 59 through the discharging hopper 104; the servo motor II 33 rotates to drive the bevel gear seven 96 to rotate, the bevel gear seven 96 drives the bevel gear six 54 and the belt conveyor 59 to synchronously rotate, qualified silicon nitride particles are conveyed to the discharge port 40, and the residual silicon nitride particles enter the feed back device 28 to be subjected to second-round screening; the self-locking universal wheel 60 can move the whole device to a fixed position;

when the feed back device 28 works, the silicon nitride particles which do not pass through the first screening pass through fall into the feed back groove 29 under the action of gravity, and then enter the conveying pipe 31 through the inclined pipe I37; the servo motor II 33 operates to drive the belt pulley II 32 to rotate, the belt pulley II 32 drives the belt pulley III 35 and the spiral blade shaft 30 to rotate through the belt I34, the spiral blade shaft 30 extrudes and conveys silicon nitride particles upwards, and the silicon nitride particles enter the feeding funnel 102 again through the inclined tube II 38 for second-round screening; after the second screening, the silicon nitride particles which do not pass through the three-layer screening net flow into the discharging pipe 39 through the inclined pipe I37, and at the moment, the electric butterfly valve 41 is opened, and falls onto the belt conveyor to be conveyed to the discharging port 40, so that the screening of the target silicon nitride particles is completed.

The beneficial effects of the technical scheme are that: the material returning device 28 carries out secondary screening on the silicon nitride particles after the primary screening, so that the non-leakage screening of the target silicon nitride particles meeting the requirements is greatly ensured, and the quality of the screened silicon nitride particles is improved. The belt conveyor 59 and the material returning device can be driven by the second servo motor 33, and the driving control is convenient.

Embodiment 5, on the basis of any one of embodiments 1 to 4, as shown in fig. 1 and 5, the right part of the base 2 is further provided with a particle cleaning and drying device 61;

the particle cleaning and drying device 61 includes: the bottom plate 62, the lead screw mounting column 63, the auxiliary adjusting device, the mounting frame 76, the annular sleeve 77, the vertical support plate 78, the rotary screen 79, the rotary cover 80, the fluted disc 81, the motor IV 82, the belt pulley V83, the belt pulley V84, the gear shaft 85, the spur gear II 86, the water storage tank 87, the electromagnetic valve 88, the spray pipe 89, the waste liquid collecting tank 90, the blow-off pipe 91, the heating cavity 92, the heating net 93, the fan 94, the hot air pipe 95 and the lifting motor 98;

a bottom plate 62 is fixedly arranged at the upper end of the right side of the base 2, an auxiliary adjusting device is connected to the bottom plate 62, and the working end of the auxiliary adjusting device is fixedly connected with a mounting frame 76;

a vertical support plate 78 is vertically and fixedly arranged at the left end of the mounting frame 76 downwards, an annular sleeve 77 is vertically arranged at the right end of the mounting frame 76 downwards, and a rotary screen 79 is rotationally arranged in the annular sleeve 77; a fluted disc 81 is fixedly arranged at the left end of the rotary screen 79, and the fluted disc 81 is rotationally connected with the vertical support plate 78;

The upper part of the fluted disc 81 is in meshed connection with a second spur gear 86, the left end of the second spur gear 86 is connected with a gear shaft 85, and the gear shaft 85 penetrates through the vertical support plate 78 along the left-right direction; the left end of the gear shaft 85 is connected with a fifth belt pulley 83; a motor IV 82 is fixedly arranged at the upper end of the left side of the mounting frame 76, and an output shaft of the motor IV 82 is connected with a belt wheel VI 84; the fifth belt pulley 83 and the sixth belt pulley 84 are driven by a belt;

a water storage tank 87 is arranged at the upper end of the mounting frame 76 and positioned on the right side of the motor IV 82, a spray pipe 89 is communicated below the water storage tank 87, and the spray pipe 89 is connected with the mounting frame 76; the spray pipe 89 is provided with an electromagnetic valve 88; a fan 94 is arranged at the upper right end of the mounting frame 76, and the right end of the fan 94 is communicated with the heating cavity 92; a heating net 93 is arranged in the heating cavity 92, and the right end of the heating cavity 92 is communicated with a hot air pipe 95; the right end of the drum screen 79 is in threaded connection with a drum cover 80; a waste liquid collecting tank 90 is arranged below the drum screen 79, and the waste liquid collecting tank 90 is connected with the upper end face of the bottom plate 62; a drain pipe 91 is arranged at the right end of the bottom of the waste liquid collecting tank 90.

Preferably, the auxiliary adjusting device includes: the screw rod mounting column 63, the T-shaped chute 64, the internal thread sliding block 65, the lifting screw rod 66, the horizontal supporting arm 67, the triangular bracket 68, the horizontal sliding sleeve 69, the horizontal sliding rod 70, the limiting block 71, the linear rack 72, the first spur gear 73, the third servo motor 74 and the first connecting rod 75;

A screw rod mounting column 63 is vertically and fixedly arranged on the left side of the bottom plate 62, and a lifting screw rod 66 is connected between the upper end and the lower end of the screw rod mounting column 63 in a vibrating manner; the lifting screw 66 is in threaded connection with an internal thread slider 65; the right end of the internal thread sliding block 65 is connected with a horizontal supporting arm 67; the top of the screw rod mounting column 63 is provided with a lifting motor 98, and an output shaft of the lifting motor 98 is connected with the top end of the lifting screw rod 66; a T-shaped chute 64 in the up-down direction is embedded in the screw rod mounting column 63, and the left end of the internal thread slider 65 is slidably connected in the T-shaped chute 64;

a triangular bracket 68 is fixedly arranged in the center of the upper end of the horizontal supporting arm 67, and the top of the triangular bracket 68 is fixedly connected with a horizontal sliding sleeve 69; a horizontal sliding rod 70 is arranged in the horizontal sliding sleeve 69 in a sliding manner along the left-right direction; a linear rack 72 is fixedly arranged at the bottom of the horizontal slide bar 70; a limiting block 71 is arranged at the left end of the horizontal sliding rod 70;

a third servo motor 74 is fixedly arranged on the front side of the right end of the tripod 68, and an output shaft of the third servo motor 74 penetrates through the tripod 68 from front to back; the rear end of an output shaft of the servo motor III 74 is connected with a first straight gear 73, and the first straight gear 73 is meshed with the straight rack 72; the right end of the horizontal sliding rod 70 is hinged with a first connecting rod 75, and the middle part of the first connecting rod 75 is rotatably connected with the right end of the horizontal supporting arm 67; the first connecting rod 75 is fixedly connected with a mounting frame 76 at the bottom end.

The working principle of the technical scheme is as follows: after the silicon nitride particles are subjected to multilayer vibration screening, a layer of dust is adhered to the surfaces of the silicon nitride particles (when part of the silicon nitride particles are stained with dust in the transportation process or dust exists in the screening mechanism, more surfaces of the silicon nitride particles are stained with dust in the vibration screening process); pouring the screened silicon nitride particles into a drum screen 79, and screwing up a drum cover 80; the motor IV 82 operates to drive the belt pulley VI 84 to rotate, the belt pulley VI 84 drives the belt pulley V83 to rotate through a belt, the belt pulley V83 rotates to enable the gear shaft 85 and the spur gear II 86 to synchronously rotate, and the spur gear II 86 drives the fluted disc 81 and the rotary screen 79 to integrally rotate in the vertical support plate 78 and the annular sleeve 77; the electromagnetic valve 88 is opened, clean water flows into the spray pipe 89 from the water storage tank 87 under the action of gravity and is sprayed out, silicon nitride particles in the drum screen 79 are cleaned, and the waste liquid is collected by the waste liquid collecting tank 90 and finally discharged by the drain pipe 91; after cleaning, the lifting motor 98 operates to drive the lifting screw 66 to rotate, the lifting screw 66 enables the internal thread sliding block 65 to slide upwards along the T-shaped sliding groove 64, the internal thread sliding block 65 drives the right horizontal supporting arm 67, the triangular bracket 68, the first connecting rod 75 and the like to move upwards, the third servo motor 74 operates to drive the first straight gear 73 to rotate, the first straight gear 73 is meshed and driven to enable the linear rack 72 and the horizontal sliding rod 70 to slide rightwards, the first connecting rod 75 is pushed out of the first connecting rod 70 rightwards, the first connecting rod 75 rotates around the right end of the horizontal supporting arm 67 by an angle under the action of a lever principle, the whole drum screen 79 tilts rightwards, the heating net 93 is heated at the moment, the fan 94 operates to blow hot air to the drum screen 79 through the hot air pipe 95; after the silicon nitride particles are dried, the operator unscrews the drum cover 80 and removes the clean silicon nitride particles.

The beneficial effects of the technical scheme are that: the particle cleaning and drying device 61 can quickly clean and remove dust on the surface of the screened silicon nitride particles and then dry the particles, so that the surface of the screened silicon nitride particles is kept clean and smooth, and the angle and the height of the drum screen 79 can be quickly adjusted by the auxiliary adjusting device.

Claims (10)

1. Screening device for silicon nitride granulation ejection of compact, characterized by, include: the screening box body (1), the base (2), the first screening mechanism, the second screening mechanism and the material returning device (28);

the screening box body (1) is fixedly arranged at the upper end of the base (2), a first screening mechanism is arranged in the screening box body (1), and a second screening mechanism is arranged below the first screening mechanism;

the screening box body (1) is connected with a feed back device (28).

2. The screening device for silicon nitride granulation and discharge according to claim 1, wherein a feed inlet (101) is arranged at the top of the screening box body (1), and a feed hopper (102) is fixedly arranged at the feed inlet (101).

3. The screening device for silicon nitride granulation and discharge according to claim 1, wherein: the first screening mechanism includes: the device comprises a coarse screening net (3), a vertical sliding sleeve (4), a protection plate (5), a vertical sliding rod (6), a first spring (7), a first bracket (8) and a guide inclined plate (9);

The screening box body (1) is characterized in that a first bracket (8) is symmetrically arranged at the left and right of the inner top of the screening box body (1), and the first bracket (8) is fixedly connected with the inner walls of the left side and the right side of the screening box body (1); a first spring (7) is fixedly arranged below the first bracket (8); a coarse screening net (3) is arranged below the first spring (7), and the coarse screening net (3) is connected with the first spring (7);

the left end of the coarse screening net (3) is provided with vertical sliding sleeves (4) symmetrically in front-back, and the vertical sliding sleeves (4) are fixedly connected with the left end face of the coarse screening net (3); a protection plate (5) is fixedly arranged on the upper end face of the left side of the coarse screening net (3), and the protection plate (5) is vertically connected with the upper end face of the coarse screening net (3); the right side of the coarse screening net (3) is fixedly connected with a material guiding inclined plate (9); the lower end of the coarse screening net (3) is connected with a material guiding funnel;

a vertical sliding rod (6) corresponding to the vertical sliding sleeve (4) is arranged on the inner wall of the left side of the screening box body (1); the vertical sliding sleeve (4) is connected with the vertical sliding rod (6) in a sliding manner along the vertical direction.

4. The screening device for silicon nitride granulation and discharge according to claim 2, wherein: the second screening mechanism includes: the device comprises a first mounting plate (10), a second mounting plate (11), a first sliding rod (12), a second spring (13), a second sliding rod (14), a third spring (15), a middle screening net (16) and an inclined screening net (17);

The screening box body (1) is characterized in that a first mounting plate (10) is arranged on the left wall inside the screening box body (1), and the first mounting plate (10) is fixedly connected to the front-rear center of the left wall of the screening box body (1);

the center of the first mounting plate (10) is provided with a first sliding rod (12), the first sliding rod (12) penetrates through the first mounting plate (10) in a sliding manner along the vertical direction, a second spring (13) is sleeved on the outer surface of the first sliding rod (12), a middle screening net (16) is arranged below the first sliding rod (12), the lower end of the first sliding rod (12) is hinged with the upper end face of the left side of the middle screening net (16), and the second spring (13) is fixedly connected with the first mounting plate (10) and the first sliding rod (12);

the right wall inside the screening box body (1) is provided with a second mounting plate (11), and the second mounting plate (11) is fixedly connected to the front-rear center of the right wall of the screening box body (1); the second mounting plate (11) is positioned below the middle screening net (16);

the center of the second mounting plate (11) is provided with a second sliding rod (14), the second sliding rod (14) penetrates through the second mounting plate (11) in a sliding manner along the vertical direction, a third spring (15) is sleeved on the outer surface of the second sliding rod (14), the third spring (15) is fixedly connected with the second mounting plate (11) and the second sliding rod (14), and the top end of the second sliding rod (14) is hinged with the right lower end of the middle screening net (16); an inclined screening net (17) is arranged below the middle screening net (16), and the inclined screening net (17) is fixedly connected with the inner wall of the screening box body (1).

5. The screening device for silicon nitride granulation and discharge according to claim 4, wherein: a driving connection port (103) is arranged in the middle of the left wall of the screening box body (1); the lower part of the feeding funnel (102) is provided withThe screening device is provided with a stirring roller (105), and the stirring roller (105) is rotationally connected with the front wall and the rear wall of the screening box body (1); the rear end of the stirring roller (105) is connected with a first chain wheel (57), and the first chain wheel (57) is positioned at the outer side of the rear end of the screening box body (1); the screening box body (1) left outer wall is provided with a driving mechanism (18), and the right side of the driving mechanism (18) is connected with a screening net vibrating device (42) _， The screening net vibrating device (42) is used for vibrating the first screening mechanism and the second screening mechanism;

the drive mechanism (18) includes: the driving box body (19), a first driving motor (20), a first transmission shaft (21), a first belt wheel (22), a first bevel gear (23), a second bevel gear (24), a third bevel gear (25), a fourth bevel gear (26) and a second transmission shaft (27);

the outer wall of the left side of the screening box body (1) is fixedly connected with a driving box body (19), and the driving box body (19) is communicated with the screening box body (1) through a driving connection port (103);

a first driving motor (20) is arranged at the inner bottom of the driving box body (19), and a first belt wheel (22) and a first bevel gear (23) are sequentially arranged at intervals in the front-rear direction of an output shaft of the first driving motor (20); a bevel gear II (24) is meshed above the bevel gear I (23); the top end of the bevel gear II (24) is fixedly provided with a transmission shaft I (21) in the vertical direction, and the transmission shaft I (21) is rotationally connected with a baffle plate in the driving box body (19);

A bevel gear III (25) is fixedly arranged at the top of the transmission shaft I (21), and a bevel gear IV (26) is connected to the right side of the bevel gear III (25) in a meshed manner;

the right end of the bevel gear IV (26) is fixedly provided with a transmission shaft II (27), the transmission shaft II (27) penetrates through the left wall of the screening box body (1) along the left-right direction, and the transmission shaft II (27) is rotationally connected with the left wall and the right wall of the screening box body (1).

6. The sieving mechanism for silicon nitride granulation and discharge as claimed in claim 5, wherein said sieving net vibrating mechanism (42) comprises: a first vibration mechanism and a second vibration mechanism;

a first vibration mechanism is arranged in the driving box body (19), and comprises: the device comprises a first partition plate (43), a rotary support (44), a third transmission shaft (45), a fourth belt wheel (46), a second belt (47), a first cam (48), a push rod base (49), a track groove (50), a third push rod (51) and a fourth spring (52);

the inner wall of the right end of the driving box body (19) is provided with a first partition board (43), and the first partition board (43) is positioned at the left side of the driving connection port (103); a rotary support (44) is arranged below the first partition plate (43), and the rotary support (44) is fixedly connected with the bottom of the driving box body (19);

the rotary support (44) is rotationally connected with a transmission shaft III (45) in the front-rear direction, the front end and the rear end of the transmission shaft III (45) are respectively provided with a belt wheel IV (46) and a cam I (48), and a belt II (47) is connected between the belt wheel IV (46) and the belt wheel I (22);

A push rod base (49) is arranged above the first cam (48), and a track groove (50) is formed in the bottom of the push rod base (49); the first cam (48) is embedded in the track groove (50); the upper part of the push rod base (49) is fixedly connected with a push rod III (51), the push rod III (51) penetrates through the first partition plate (43) in a sliding manner along the up-down direction, a spring IV (52) is sleeved outside the push rod III (51), and the upper end and the lower end of the spring IV (52) are respectively fixedly connected with the first partition plate (43) and the push rod base (49); the push rod III (51) is propped against the bottom of the middle screening net (16);

the first screening mechanism below is equipped with second vibration mechanism, and second vibration mechanism includes: bevel gear five (53), bevel gear six (54), cam two (55), connecting shaft (56), sprocket two (58);

a pair of bevel gears (53) are arranged on the transmission shaft II (27) at left and right intervals; a connecting shaft (56) in the front-rear direction is arranged above the bevel gear V (53), the connecting shafts (56) are arranged in two at left-right intervals, and the connecting shafts (56) are rotationally connected with the front wall and the rear wall of the screening box body (1); the connecting shaft (56) is provided with a cam II (55) symmetrically in front and back; the second cam (55) is contacted with the lower end of the upper coarse screening net (3); a bevel gear six (54) is arranged in the middle of the connecting shaft (56); the bevel gear six (54) is in meshed connection with the bevel gear five (53); the rear end of the left connecting shaft (56) is connected with a second chain wheel (58), and the second chain wheel (58) and the first chain wheel (57) are in chain transmission.

7. A screening device for granulating and discharging silicon nitride according to claim 4, wherein,

the feed back device (28) comprises: the device comprises a feed back groove (29), a spiral blade shaft (30), a conveying pipe (31), a belt pulley II (32), a servo motor II (33), a belt I (34), a belt pulley III (35), a rotating shaft (36), a inclined pipe I (37), an inclined pipe II (38), a discharge pipe (39) and an electric butterfly valve (41);

a return trough (29) is arranged below the right side of the inclined screening net (17), and the bottom of the return trough (29) is fixedly connected with the bottom end inside the screening box body (1); a conveying pipe (31) is arranged on the right outer side of the screening box body (1), and the bottom of the conveying pipe (31) is connected with the base (2);

the right side of the return chute (29) is provided with an inclined tube I (37), the inclined tube I (37) is communicated with the right end of the return chute (29) and a feed inlet communicated with the bottom of the conveying pipe (31), a discharge pipe (39) is connected below the inclined tube I (37), and an electric butterfly valve (41) is arranged on the discharge pipe (39); an inclined tube II (38) is arranged between the top of the conveying tube (31) and the feeding funnel (102), and the inclined tube II (38) is communicated with a discharge hole of the conveying tube (31) and the feeding funnel (102);

a vertical spiral blade shaft (30) is arranged in the conveying pipe (31), and the spiral blade shaft (30) is rotationally connected with the conveying pipe (31); the bottom end of the spiral blade shaft (30) is provided with a belt pulley II (32); a second servo motor (33) is arranged on the right side of the conveying pipe (31), an output shaft of the second servo motor (33) penetrates through the top wall of the base (2), a rotating shaft (36) is connected below the output shaft of the second servo motor (33), and the rotating shaft (36) penetrates through the upper wall of the base (2); and a belt wheel III (35) is arranged on the rotating shaft (36), and a belt I (34) is connected between the belt wheel III (35) and the belt wheel II (32).

8. The screening device for silicon nitride granulation and discharge according to claim 7, wherein the base (2) is hollow, and a belt conveyor (59) in the left-right direction is further arranged in the base (2); a bevel gear six (54) is arranged at the front side of the roller at the right end of the belt conveyor (59); a bevel gear seven (96) is engaged and connected above the bevel gear six (54), and the bevel gear seven (96) is fixedly connected with the output shaft of the servo motor two (33);

a discharging funnel (104) is arranged at the top of the base (2) and the bottom of the screening box body (1); self-locking universal wheels (60) are arranged at four corners of the bottom end of the base (2); the left end of the base (2) is provided with a discharge hole (40).

9. The screening device for silicon nitride granulation and discharge according to claim 1, wherein the right part of the base (2) is further provided with a particle cleaning and drying device (61);

the particle cleaning and drying device (61) comprises: the device comprises a bottom plate (62), a screw rod mounting column (63), an auxiliary adjusting device, a mounting frame (76), an annular sleeve (77), a vertical support plate (78), a drum screen (79), a drum cover (80), a fluted disc (81), a motor IV (82), a belt pulley V (83), a belt pulley V (84), a gear shaft (85), a spur gear II (86), a water storage tank (87), an electromagnetic valve (88), a spray pipe (89), a waste liquid collecting tank (90), a sewage drain pipe (91), a heating cavity (92), a heating net (93), a fan (94), a hot air pipe (95) and a lifting motor (98);

A bottom plate (62) is fixedly arranged at the upper end of the right side of the base (2), an auxiliary adjusting device is connected to the bottom plate (62), and a mounting frame (76) is fixedly connected to the working end of the auxiliary adjusting device;

the left end of the mounting frame (76) is downwards and vertically provided with a vertical support plate (78), the right end of the mounting frame (76) is downwards and vertically provided with an annular sleeve (77), and a rotary screen (79) is rotationally arranged in the annular sleeve (77); a fluted disc (81) is fixedly arranged at the left end of the rotary screen (79), and the fluted disc (81) is rotationally connected with the vertical support plate (78);

the upper part of the fluted disc (81) is connected with a second spur gear (86) in a meshed manner, the left end of the second spur gear (86) is connected with a gear shaft (85), and the gear shaft (85) penetrates through the vertical support plate (78) along the left-right direction; the left end of the gear shaft (85) is fixedly connected with a fifth belt pulley (83); a motor IV (82) is fixedly arranged at the upper end of the left side of the mounting frame (76), and an output shaft of the motor IV (82) is connected with a belt wheel VI (84); the fifth belt pulley (83) and the sixth belt pulley (84) are driven by a belt;

a water storage tank (87) is arranged at the right side of the motor IV (82) at the upper end of the mounting frame (76), a spray pipe (89) is communicated below the water storage tank (87), and the spray pipe (89) is connected with the mounting frame (76); an electromagnetic valve (88) is arranged on the spray pipe (89); a fan (94) is arranged at the upper end of the right side of the mounting frame (76), and the right end of the fan (94) is communicated with a heating cavity (92); a heating net (93) is arranged in the heating cavity (92), and the right end of the heating cavity (92) is communicated with a hot air pipe (95); the right end of the rotary screen (79) is in threaded connection with a rotary cover (80); a waste liquid collecting tank (90) is arranged below the rotary screen (79), and the waste liquid collecting tank (90) is connected with the upper end surface of the bottom plate (62); a drain pipe (91) is arranged at the right end of the bottom of the waste liquid collecting tank (90).

10. The screening device for silicon nitride granulation and discharge according to claim 9, wherein,

the auxiliary adjusting device comprises: the device comprises a screw rod mounting column (63), a T-shaped chute (64), an internal thread sliding block (65), a lifting screw rod (66), a horizontal supporting arm (67), a triangular bracket (68), a horizontal sliding sleeve (69), a horizontal sliding rod (70), a limiting block (71), a linear rack (72), a first spur gear (73), a third servo motor (74) and a first connecting rod (75);

a screw rod mounting column (63) is vertically and fixedly arranged on the left side of the bottom plate (62), and a lifting screw rod (66) is connected between the upper end and the lower end of the screw rod mounting column (63) in a vibrating manner; the lifting screw rod (66) is connected with an internal thread sliding block (65) through threads; the right end of the internal thread sliding block (65) is connected with a horizontal supporting arm (67); the top of the screw rod mounting column (63) is provided with a lifting motor (98), and an output shaft of the lifting motor (98) is connected with the top end of the lifting screw rod (66); a T-shaped chute (64) in the up-down direction is embedded in the lead screw mounting column (63), and the left end of the internal thread sliding block (65) is in sliding connection in the T-shaped chute (64);

a triangular bracket (68) is fixedly arranged at the center of the upper end of the horizontal supporting arm (67), and the top of the triangular bracket (68) is fixedly connected with a horizontal sliding sleeve (69); a horizontal sliding rod (70) is arranged in the horizontal sliding sleeve (69) in a sliding manner along the left-right direction; a linear rack (72) is fixedly arranged at the bottom of the horizontal sliding rod (70); a limiting block (71) is arranged at the left end of the horizontal sliding rod (70);

A servo motor III (74) is fixedly arranged on the front side of the right end of the tripod (68), and an output shaft of the servo motor III (74) penetrates through the tripod (68) front and back; the rear end of an output shaft of the servo motor III (74) is connected with a first spur gear (73), and the first spur gear (73) is meshed with the linear rack (72); the right end of the horizontal sliding rod (70) is hinged with a first connecting rod (75), and the middle part of the first connecting rod (75) is rotationally connected with the right end of the horizontal supporting arm (67); and the bottom end of the first connecting rod (75) is fixedly connected with a mounting frame (76).

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