A screen conveyor

Abstract

The utility model relates to the technical field of food conveying equipment, specifically a screen conveyor, including a frame and a conveying mechanism and a driving mechanism arranged on the frame. The screen conveyor also includes a displacement mechanism, and the displacement mechanism includes a plurality of elastic members. The conveying mechanism includes a buffer bin and a conveying bin, and the buffer bin is fixedly arranged above the conveying bin. A plurality of elastic members are evenly fixedly connected between the conveying bin and the top of the frame, and each elastic member is in an inclined state. The driving mechanism includes a driving source and a transmission assembly, and the driving source is fixedly arranged at the bottom of the frame, and the driving source is movably connected to the conveying bin through the transmission assembly. The screen conveyor of the utility model can not only screen materials and powder particles, but also separately convey materials and powder particles.

Description

Technical Field

[0001] The utility model relates to the technical field of food conveying equipment, in particular to a screen conveyor. Background Art

[0002] At present, on the market, after the surface of the material (food to be processed) is coated with powder, the powder (powder particles) needs to be sieved off. This step requires manual screening or the use of a vibrating screen to dry the material and then manually collect the material. First, the manual screening of materials and coating of powder has low work efficiency, small output, and cannot work continuously. Secondly, after the existing vibrating screen screens screen the materials and coat the powder, the screened materials still need to be manually collected and transferred, and the work efficiency is also low, and it cannot work continuously. Therefore, a screen conveyor is urgently needed to solve the above problems. Utility Model Content

[0003] In order to solve the technical problems that manual or vibrating screens are inefficient in screening materials and coating powder, and cannot work continuously, the utility model provides a screen conveyor, which can not only screen materials and powder particles, but also separately convey materials and powder particles.

[0004] The utility model provides a screen conveyor, including a frame and a conveying mechanism and a driving mechanism arranged on the frame. The screen conveyor also includes a displacement mechanism, and the displacement mechanism includes a plurality of elastic members. The conveying mechanism includes a buffer bin and a conveying bin. The buffer bin is fixedly arranged above the conveying bin. A plurality of elastic members are evenly and fixedly connected between the conveying bin and the top of the frame. Each of the elastic members is in an inclined state. The driving mechanism includes a driving source and a transmission assembly. The driving source is fixedly arranged at the bottom of the frame, and the driving source is movably connected to the conveying bin through the transmission assembly. The conveying bin is fixedly connected to the frame through a plurality of elastic members. Since the elastic members are elastic, the driving source can drive the conveying bin to move through the transmission assembly, that is, drive the conveying bin to reciprocate and vibrate. The driving source is started, driving the transmission assembly to rotate, thereby driving the conveying bin to do reciprocating and vibrating motion.

[0005] Furthermore, each of the elastic members is configured as a spring plate, and both ends of each of the spring plates are respectively fixedly connected to the outer wall of the conveying bin and the top of the frame through a fixing plate. The elastic member is configured as a spring plate. The conveying bin is fixedly connected to the frame through a plurality of spring plates, and the spring plates can support the conveying bin; since the spring plates are elastic, the driving source can drive the conveying bin to move through the transmission assembly.

[0006] Furthermore, a plurality of the fixing plates are evenly fixedly connected to the outer side wall of the conveying bin and the top of the frame, each of the fixing plates is tilted, a first connection hole is provided at both ends of each spring plate, a second connection hole is provided on each fixing plate, and each of the first connection hole and the second connection hole is fixedly connected by a nut and a bolt. By providing the first connection hole at both ends of the spring plate, providing the second connection hole on the fixing plate, the first connection hole, the second connection hole, the nut and the bolt, the spring plate is fixed between the outer side wall of the conveying bin and the top of the frame.

[0007] Furthermore, the conveying bin includes a conveying frame and a stepped particle screen, a feeding trough is arranged inside the conveying frame, the particle screen is fixedly arranged inside the conveying frame and located above the feeding trough, and there is a space for particles to pass through between the particle screen and the feeding trough; the buffer bin is fixedly arranged at one end of the conveying frame and located above one end of the particle screen, a first discharge port is arranged on the other end of the conveying frame, the first discharge port is located to the side of the other end of the particle screen, and a second discharge port connected to the feeding trough is arranged on the bottom of the conveying frame, the second discharge port is located below the other end of the particle screen. The purpose of setting the stepped particle screen is that after the material passes through the buffer bin and enters the particle screen, the material can roll over for many times, so that the powder particles on the front and the turned side of the material can be screened out through reciprocating vibration motion, and the screening effect is better.

[0008] Furthermore, the particle screen includes a plurality of sub-screens, which are fixedly arranged inside the conveying frame in sequence and are all located above the blanking chute, and the plurality of sub-screens extend in sequence along the length direction of the conveying frame and are arranged in sequence from top to bottom along the height direction of the conveying frame, and the space is formed between the blanking chute and the plurality of sub-screens; the buffer bin is located above the uppermost sub-screen, the first discharge port is located to the side of the lowermost sub-screen, and the second discharge port is located below the lowermost sub-screen. The material can enter the blanking chute through the plurality of sub-screens.

[0009] Furthermore, the buffer bin is provided with a connected feeding port and a discharging port, the discharging port is located above the uppermost sub-sieve with a gap therebetween, and a material blocking plate is detachably provided on one side of the buffer bin, the material blocking plate is located on one side of the gap and contacts the top of the uppermost sub-sieve. When screening materials and powder particles, the material blocking plate is removed, and the materials can pass through the buffer bin and the gap into the conveying bin.

[0010] Furthermore, a fixing hole is provided on one side of the buffer bin, a waist-shaped hole is provided on the material baffle plate, and the fixing hole and the waist-shaped hole are fixedly connected by a star-shaped handle. The waist-shaped hole can change the position of the material baffle plate, thereby changing the size of the gap, thereby adjusting the conveying amount of the material.

[0011] Further, the driving source is set as a driving motor, and the transmission assembly includes an eccentric shaft, a driven wheel, a driving wheel, a belt, a connecting rod and two bearing seats. The two bearing seats are relatively arranged on the top of the frame, and the eccentric shaft is rotatably connected with the two bearing seats. One end of the eccentric shaft passes through one of the bearing seats and is fixedly connected with the driven wheel. The output shaft of the driving motor is fixedly connected with the driving wheel and can drive it to rotate. The belt is set between the driving wheel and the driven wheel. Rod end joint bearings are provided at both ends of the connecting rod. The two rod end joint bearings are respectively rotatably connected with the middle part of the eccentric shaft and the conveying bin. The driving motor is started to drive the driven wheel, the driving wheel and the belt to rotate, and then drive the eccentric shaft fixedly connected to the driving wheel to rotate. After the eccentric shaft rotates, the connecting rod and the two rod end joint bearings are driven to rotate. Since the two rod end joint bearings are respectively rotatably connected with the middle part of the eccentric shaft and the conveying bin, although the conveying bin is fixedly connected with the frame through multiple elastic members, under the elastic action of the elastic members, the conveying bin is finally driven to perform reciprocating vibration motion.

[0012] Furthermore, a connection seat is provided on the bottom of the conveying bin, a pin is provided on the connection seat, and the two rod end joint bearings are rotatably connected to the middle part of the eccentric shaft and the pin respectively; a protective cover corresponding to the belt is provided on the frame. By providing the pin on the connection seat, one of the rod end joint bearings is rotatably connected to the conveying bin. The protective cover protects the belt to prevent the belt from being damaged.

[0013] Furthermore, an eccentric portion is provided in the middle of the eccentric shaft, and a rod end joint bearing close to the eccentric shaft is rotatably connected to the eccentric portion.

[0014] Compared with the prior art, the utility model has the following technical effects:

[0015] The screen conveyor of the utility model has a conveying bin fixedly connected to the frame through a plurality of elastic parts. Since the elastic parts are elastic, the driving source can drive the conveying bin to move through the transmission component, that is, drive the conveying bin to vibrate back and forth. The driving source is started, driving the transmission component to rotate, and then driving the conveying bin to vibrate back and forth. Finally, after the material passes through the buffer bin, the material and the powder particles are separated through the conveying bin, and the purpose of separately conveying the material and the powder particles is achieved at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of a screen conveyor of the utility model. Figure 1 ;

[0017] Figure 2 This utility model Figure 1 A magnified schematic diagram of the structure Figure 2 ;

[0018] Figure 3 This is a schematic diagram of the structure of the conveying bin of the utility model. Figure 3 ;

[0019] Figure 4 The structure of the conveying frame of the utility model is schematically shown Figure 4 ;

[0020] Figure 5 The structure of the transmission assembly of the utility model is schematically shown Figure 5 ;

[0021] Figure 6 The structure of the baffle plate of the utility model is schematically shown Figure 6 ;

[0022] Figure 7 The structure diagram of the eccentric shaft of the utility model Figure 7 ;

[0023] The reference numerals in the accompanying drawings are:

[0024] 1. Frame; 11. Protective cover;

[0025] 2. Buffer bin; 21. Baffle plate;

[0026] 3. Conveying bin; 31. Conveying frame; 311. Dropping chute; 32. Particle screen; 321. Sub-screen; 33. First discharge port; 34. Second discharge port; 35. Connecting seat;

[0027] 4. Spring plate; 41. Fixed plate;

[0028] 5. Transmission assembly; 51. Eccentric shaft; 511. Eccentric part; 52. Driven wheel; 53. Driving wheel; 54. Belt; 55. Connecting rod; 56. Bearing seat; 57. Rod end joint bearing;

[0029] 6. Drive motor. DETAILED DESCRIPTION

[0030] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0031] like Figures 1 to 7As shown, a screen conveyor includes a frame 1 and a conveying mechanism and a driving mechanism arranged on the frame 1, wherein the conveying mechanism includes a buffer bin 2 and a conveying bin 3, wherein the buffer bin 2 is fixedly arranged above the conveying bin 3, and the conveying bin 3 is movably arranged on the top of the frame 1, and the driving mechanism includes a driving source and a transmission assembly 5, wherein the driving source is fixedly arranged at the bottom of the frame 1, and the driving source is movably connected to the conveying bin 3 through the transmission assembly 5. The screen conveyor also includes a displacement mechanism, wherein the displacement mechanism includes a plurality of elastic members, wherein the plurality of elastic members are evenly fixedly connected between the conveying bin 3 and the top of the frame 1, and each of the elastic members is in an inclined state.

[0032] The conveying bin 3 is fixedly connected to the frame 1 through a plurality of elastic members. Since the elastic members are elastic, the driving source can drive the conveying bin 3 to move through the transmission assembly 5, that is, drive the conveying bin 3 to vibrate back and forth. The driving source is started, driving the transmission assembly 5 to rotate, and then driving the conveying bin 3 to vibrate back and forth. Finally, after the material passes through the buffer bin 2, the material and the powder particles are separated through the conveying bin 3, and the purpose of separately conveying the material and the powder particles is achieved at the same time.

[0033] The screen conveyor of this embodiment replaces manual labor and can not only screen materials and powder particles, but also separately convey materials and powder particles, thereby effectively improving the screening efficiency of materials.

[0034] As an implementable embodiment, each of the elastic members is configured as a spring plate 4, and both ends of each of the spring plates 4 are fixedly connected to the outer wall of the conveying bin 3 and the top of the frame 1 respectively through a fixing plate 41, and each of the spring plates 4 is in an inclined state. Among them, the fixing plate 41 located on the outer wall of the conveying bin 3 and the fixing plate 41 located on the top of the frame 1, which are fixedly connected to both ends of the spring plate 4, are arranged relatively along the above-mentioned spring plates 4. In this embodiment, the elastic member is configured as a spring plate 4. The conveying bin 3 is fixedly connected to the frame 1 through a plurality of spring plates 4, and the spring plates 4 can support the conveying bin 3; since the spring plates 4 are elastic, the driving source can drive the conveying bin 3 to move through the transmission assembly 5.

[0035] Specifically, the plurality of fixing plates 41 are evenly fixedly connected to the outer wall of the conveying bin 3 and the top of the frame 1, and each of the fixing plates 41 is tilted. The plurality of fixing plates 41 of this embodiment can be fixed to the outer wall of the conveying bin 3 and the top of the frame 1 by welding. A first connecting hole is provided on both ends of each of the spring plates 4, and a second connecting hole is provided on each of the fixing plates 41. Each of the first connecting holes and the second connecting holes is fixedly connected by nuts and bolts. By providing a first connecting hole on both ends of the spring plate 4, providing a second connecting hole on the fixing plate 41, the first connecting hole, the second connecting hole, the nuts and the bolts, the spring plate 4 is fixed between the outer wall of the conveying bin 3 and the top of the frame 1. See FIG. Figure 2 In fact, a plurality of the fixing plates 41 are evenly fixedly connected to the outside of the conveying frame 31 and the top of the frame 1 .

[0036] As an implementable embodiment, the conveying bin 3 includes a conveying frame 31 and a stepped particle screen 32, a feeding trough 311 is arranged inside the conveying frame 31, the particle screen 32 is fixedly arranged inside the conveying frame 31 and located above the feeding trough 311, and there is a space for particles to pass through between the particle screen 32 and the feeding trough 311; the buffer bin 2 is fixedly arranged at one end of the conveying frame 31 and located above one end of the particle screen 32, a first discharge port 33 is arranged on the other end of the conveying frame 31, the first discharge port 33 is located on the side of the other end of the particle screen 32, and a second discharge port 34 connected to the feeding trough 311 is arranged on the bottom of the conveying frame 31. The second discharge port 34 in this embodiment is inclined to further facilitate the discharge of powder particles, and the second discharge port 34 is located below the other end of the particle screen 32.

[0037] The buffer bin 2 is used to store materials to be screened and transported. The transport frame 31 is used to transport materials and powder particles separately. The stepped particle screen 32 is used to separate materials and powder particles. The purpose of setting the stepped particle screen 32 is that after the material passes through the buffer bin 2 and enters the particle screen 32, the material can roll over many times, so that the powder particles on the front and back of the material can be screened out through reciprocating vibration motion, and the screening effect is better.

[0038] When the conveying bin 3 performs reciprocating vibration motion, that is, the conveying frame 31 and the particle screen 32 perform reciprocating vibration motion, the material in the buffer bin 2 enters one end of the particle screen 32, and the material can roll over on the stepped particle screen 32 for many times to achieve the effect of turning over, and the powder particles on the front and the turned side of the material can enter the chute 311 after the particle screen 32 vibrates, wherein the powder particles in the chute 311 are discharged through the second discharge port 34 located below the other end of the particle screen 32. The screened material is discharged after being transported to the first discharge port 33 through vibration, and is ready to enter the next process for processing.

[0039] A crossbeam is fixedly arranged inside the conveying frame 31, and the crossbeam is located above the particle screen 32. The crossbeam is arranged to further increase the structural strength of the conveying frame 31.

[0040] As an implementable embodiment, the particle screen 32 includes a plurality of sub-screens 321, which are fixedly arranged inside the conveying frame 31 in sequence and are all located above the blanking chute 311. The plurality of sub-screens 321 extend in sequence along the length direction of the conveying frame 31 and are arranged in sequence from top to bottom along the height direction of the conveying frame 31. The plurality of sub-screens 321 form a stepped shape, and the space is formed by the blanking chute 311 and the plurality of sub-screens 321. The buffer bin 2 is located above the uppermost sub-screen 321, the first discharge port 33 is located on the side of the lowermost sub-screen 321, and the second discharge port 34 is located below the lowermost sub-screen 321. The material can enter the blanking chute 311 through the plurality of sub-screens 321.

[0041] Furthermore, a connecting plate is fixedly connected between each two adjacent sub-sieves 321. The sub-sieves 321 can be arranged inside the conveying frame 31 by welding. The arrangement of the connecting plate enables the multiple sub-sieves 321 to better screen materials and powder particles.

[0042] As an implementation method, the buffer bin 2 is provided with a connected feeding port and a discharging port, the discharging port is located above the uppermost sub-screen 321 with a gap therebetween, and a material blocking plate 21 is detachably provided on one side of the buffer bin 2, the material blocking plate 21 is located on one side of the gap and contacts the top of the uppermost sub-screen 321. Since the buffer bin 2 is fixedly provided at one end of the conveying frame 31 and located above one end of the particle screen 32, the discharging port of the buffer bin 2 is located above one end of the particle screen 32, that is, above the uppermost sub-screen 321.

[0043] When the screen conveyor is not working, the material blocking plate 21 is fixed on one side of the buffer bin 2 and contacts the top of the uppermost sub-screen 321 , so that the material to be screened and conveyed in the buffer bin 2 cannot enter the conveying bin 3 .

[0044] When screening materials and powder particles, the material blocking plate 21 is removed, and the materials can pass through the buffer bin 2 and the gap into the conveying bin 3 .

[0045] The buffer bin 2 is provided with a fixing hole on one side, and the baffle plate 21 is provided with a waist-shaped hole, and the fixing hole and the waist-shaped hole are fixedly connected by a star-shaped handle. The waist-shaped hole can change the position of the baffle plate 21, and then change the size of the gap, so as to adjust the conveying amount of the material.

[0046] As an implementable embodiment, the driving source is set to a driving motor 6, and the transmission assembly 5 includes an eccentric shaft 51, a driven wheel 52, a driving wheel 53, a belt 54, a connecting rod 55 and two bearing seats 56. The two bearing seats 56 are relatively arranged on the top of the frame 1, and the eccentric shaft 51 is rotatably connected to the two bearing seats 56. One end of the eccentric shaft 51 passes through one of the bearing seats 56 and is fixedly connected to the driven wheel 52. The output shaft of the driving motor 6 is fixedly connected to the driving wheel 53 and can drive it to rotate. The belt 54 is sleeved between the driving wheel 53 and the driven wheel 52. Rod end joint bearings 57 are provided at both ends of the connecting rod 55. The two rod end joint bearings 57 are respectively rotatably connected to the middle part of the eccentric shaft 51 and the conveying bin 3.

[0047] The driving motor 6 is started to drive the driven wheel 52, the driving wheel 53 and the belt 54 to rotate, thereby driving the eccentric shaft 51 fixedly connected to the driving wheel 53 to rotate. After the eccentric shaft 51 rotates, it drives the connecting rod 55 and the two rod end joint bearings 57 to rotate.

[0048] Since the two rod end joint bearings 57 are rotationally connected to the middle part of the eccentric shaft 51 and the conveying bin 3 respectively, although the conveying bin 3 is fixedly connected to the frame 1 through multiple elastic parts, under the elastic action of the elastic parts, the conveying bin 3 is finally driven to perform reciprocating vibration motion.

[0049] Specifically, a connection seat 35 is provided on the bottom of the conveying bin 3, a pin is provided on the connection seat 35, and two rod end joint bearings 57 are rotatably connected to the middle part and the pin of the eccentric shaft 51. By providing a pin on the connection seat 35, one of the rod end joint bearings 57 is rotatably connected to the conveying bin 3.

[0050] As an implementation method, the frame 1 is provided with a protective cover 11 corresponding to the belt 54. The protective cover 11 protects the belt 54 to prevent the belt 54 from being damaged.

[0051] As an implementation method, an eccentric portion 511 is provided in the middle of the eccentric shaft 51, and a rod end joint bearing 57 close to the eccentric shaft 51 is rotatably connected to the eccentric portion 511. Figure 7 , one of the rod end joint bearings 57 on the connecting rod 55 is connected to the eccentric portion 511 of the eccentric shaft 51. Because the eccentric portion 511 and the eccentric shaft 51 are not concentric (the axes of the two are not the same), the eccentric shaft 51 has an eccentric effect when rotating, thereby driving the connecting rod 55 to reciprocate. Because the conveying bin 3 is fixedly connected to the frame 1 through multiple spring plates 4, and the spring plates 4 are inclined, the connecting rod 55 finally drives the conveying bin 3 connected thereto to perform reciprocating vibration motion. It is worth noting that reciprocation refers to the displacement of the conveying bin 3 in the horizontal direction, and vibration refers to the displacement of the conveying bin 3 in the vertical direction.

[0052] During the working process of the screen conveyor, the material to be screened and conveyed enters the buffer bin 2 through the feeding port.

[0053] By opening the baffle plate 21 , the material in the buffer bin 2 can enter the conveying bin 3 through the discharge port and the gap.

[0054] The driving motor 6 is started to drive the driven wheel 52, the driving wheel 53 and the belt 54 to rotate, thereby driving the eccentric shaft 51 fixedly connected to the driving wheel 53 to rotate. After the eccentric shaft 51 rotates, it drives the connecting rod 55 and the two rod end joint bearings 57 to rotate.

[0055] Since the two rod end joint bearings 57 are rotatably connected to the middle part of the eccentric shaft 51 and the pin shaft at the bottom of the conveying bin 3 respectively, although the conveying bin 3 is fixedly connected to the frame 1 through multiple spring plates 4, under the elastic action of the spring plates 4, the conveying bin 3 is ultimately driven to perform reciprocating vibration motion.

[0056] When the conveying bin 3 performs reciprocating vibration motion, that is, when the conveying frame 31 and the particle screen 32 perform reciprocating vibration motion, the material in the buffer bin 2 enters the uppermost sub-screen 321, and the material can roll over multiple times on multiple sub-screens 321 to achieve the effect of turning over. The powder particles on the front and the turned-over side of the material can enter the blanking trough 311 after the vibration of multiple sub-screens 321, wherein the powder particles in the blanking trough 311 are discharged through the second discharge port 34 located below the lowermost sub-screen 321. The screened material is then discharged after being transported to the rear first discharge port 33 through vibration, and is ready to enter the next process for processing. After the screening operation is completed, the baffle plate 21 is fixed on one side of the buffer bin 2 again, and contacts the top of the uppermost sub-screen 321, so that the material to be screened and transported in the buffer bin 2 cannot enter the conveying bin 3.

[0057] The embodiments described above are only preferred embodiments of the present invention and are only used to explain the present invention, not to limit the scope of implementation of the present invention. For those skilled in the art, other implementation methods can certainly be easily made by replacement or modification based on the technical contents disclosed in this specification. Therefore, all changes and improvements made to the principles and process conditions of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. A screen conveyor, comprising a frame (1) and a conveying mechanism and a driving mechanism arranged on the frame (1), characterized in that: The screen conveyor further comprises a displacement mechanism, the displacement mechanism comprises a plurality of elastic members, the conveying mechanism comprises a buffer bin (2) and a conveying bin (3), the buffer bin (2) is fixedly arranged above the conveying bin (3), a plurality of elastic members are evenly and fixedly connected between the conveying bin (3) and the top of the frame (1), each of the elastic members is in an inclined state, and the driving mechanism comprises a driving source and a transmission assembly (5), the driving source is fixedly arranged at the bottom of the frame (1), and the driving source is movably connected to the conveying bin (3) via the transmission assembly (5).

2. The screen conveyor according to claim 1, characterized in that: Each of the elastic members is configured as a spring plate (4), and both ends of each of the spring plates (4) are respectively fixedly connected to the outer side wall of the conveying bin (3) and the top of the frame (1) via fixing plates (41).

3. The screen conveyor according to claim 2, characterized in that: A plurality of the fixing plates (41) are evenly fixedly connected to the outer wall of the conveying bin (3) and the top of the frame (1); each of the fixing plates (41) is arranged at an angle; a first connecting hole is arranged at both ends of each of the spring plates (4); a second connecting hole is arranged on each of the fixing plates (41); and each of the first connecting hole and the second connecting hole is fixedly connected by a nut and a bolt.

4. The screen conveyor according to claim 1, characterized in that: The conveying bin (3) comprises a conveying frame (31) and a stepped particle screen (32); a feeding trough (311) is arranged inside the conveying frame (31); the particle screen (32) is fixedly arranged inside the conveying frame (31) and located above the feeding trough (311); a space for particles to pass through is provided between the particle screen (32) and the feeding trough (311); the buffer bin (2) is fixedly arranged at one end of the conveying frame (31) and located above one end of the particle screen (32); a first discharge port (33) is arranged at the other end of the conveying frame (31); the first discharge port (33) is located to the side of the other end of the particle screen (32); a second discharge port (34) connected to the feeding trough (311) is arranged at the bottom of the conveying frame (31); the second discharge port (34) is located below the other end of the particle screen (32).

5. The screen conveyor according to claim 4, characterized in that: The particle screen (32) comprises a plurality of sub-screens (321), the plurality of sub-screens (321) are fixedly arranged in sequence inside the conveying frame (31) and are all located above the blanking chute (311), the plurality of sub-screens (321) extend in sequence along the length direction of the conveying frame (31) and are arranged in sequence from top to bottom along the height direction of the conveying frame (31), and the space is formed between the blanking chute (311) and the plurality of sub-screens (321); the buffer bin (2) is located above the uppermost sub-screen (321), the first discharge port (33) is located on the side of the lowermost sub-screen (321), and the second discharge port (34) is located below the lowermost sub-screen (321).

6. The screen conveyor according to claim 5, characterized in that: The buffer bin (2) is provided with a feeding port and a discharging port which are connected to each other. The discharging port is located above the uppermost sub-sieve (321) with a gap therebetween. A material blocking plate (21) is detachably provided on one side of the buffer bin (2). The material blocking plate (21) is located on one side of the gap and in contact with the top of the uppermost sub-sieve (321).

7. The screen conveyor according to claim 6, characterized in that: A fixing hole is provided on one side of the buffer bin (2), and a waist-shaped hole is provided on the material blocking plate (21), and the fixing hole and the waist-shaped hole are fixedly connected via a star-shaped handle.

8. The screen conveyor according to claim 1, characterized in that: The driving source is set as a driving motor (6), and the transmission assembly (5) comprises an eccentric shaft (51), a driven wheel (52), a driving wheel (53), a belt (54), a connecting rod (55) and two bearing seats (56). The two bearing seats (56) are arranged on the top of the frame (1) relative to each other. The eccentric shaft (51) is rotatably connected to the two bearing seats (56). One end of the eccentric shaft (51) passes through one of the bearing seats (56) and is fixedly connected to the driven wheel (52). The output shaft of the driving motor (6) is fixedly connected to the driving wheel (53) and can drive the driving wheel (53) to rotate. The belt (54) is sleeved between the driving wheel (53) and the driven wheel (52). Rod end joint bearings (57) are arranged at both ends of the connecting rod (55). The two rod end joint bearings (57) are rotatably connected to the middle part of the eccentric shaft (51) and the conveying bin (3) respectively.

9. The screen conveyor according to claim 8, characterized in that: A connecting seat (35) is arranged on the bottom of the conveying bin (3), a pin is arranged on the connecting seat (35), and two rod end joint bearings (57) are rotatably connected to the middle part of the eccentric shaft (51) and the pin respectively; a protective cover (11) corresponding to the belt (54) is arranged on the frame (1).

10. The screen conveyor according to claim 8, characterized in that: An eccentric portion (511) is provided in the middle of the eccentric shaft (51), and a rod end joint bearing (57) close to the eccentric shaft (51) is rotatably connected to the eccentric portion (511).

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