Belt type conveying screening machine and screening method

Abstract

The invention relates to the technical field of screening, in particular to a belt type conveying and screening machine and a screening method.The belt type conveying and screening machine comprises a fixing frame body, a conveying and screening belt, a vibration knockout device and a material guiding plate, the conveying and screening belt, the vibration knockout device and the material guiding plate are arranged in the fixing frame body, the conveying and screening belt comprises a screening belt, and screening holes are formed in the belt face of the screening belt; the screening belt is divided into an ascending screening belt and a descending screening belt, the vibration knockout device is arranged between the ascending screening belt and the descending screening belt, and a material guide plate is arranged below the ascending screening belt. The vibrating screen has the beneficial effects that the fixed frame body is free of vibration, the vibration energy consumption is small, the requirement for exciting force is reduced, the vibration load is small, and the power of a vibration power source is reduced; the vibration screening cost is reduced, the screening quality is high, the screening effect is good, overall sealing and upper cover sealing during operation are achieved, dust overflowing is greatly reduced, and the surrounding ecological environment is protected.

Description

Technical Field

[0001] The invention relates to the technical field of screening, and in particular to a belt conveyor screening machine and a screening method. Background Art

[0002] Vibrating screening machine is a mechanical equipment used for material classification, screening, filtering or dehydration, and is widely used in mining, metallurgy, chemical industry, building materials, food and other industries. It makes the material move on the screen surface through vibration, thereby realizing the separation of materials of different particle sizes. The vibrating screening machine generates periodic vibration through the vibration power source or exciter, so that the screen box and the screen mesh vibrate accordingly. After the material enters the screen box from the feed inlet, the material smaller than the screen mesh aperture falls to the lower layer through the screen mesh under the action of vibration; the material larger than the screen mesh aperture moves forward along the screen surface and is finally discharged from the discharge port. The traditional vibrating screening machine is blocked by the screen mesh due to the high viscosity or high water content of the material, the vibration power source is insufficient to excite the vibration force, the vibration power source loads the vibrating screening machine as a whole, the load is too large and the consumption is too large, the vibration power source and the shock absorbing spring are easily damaged and frequently replaced. At the same time, because the screening vibration amplitude is at a certain angle with the material running route, the vibration amplitude is affected, the vibration frequency is insufficient, resulting in low screening efficiency, poor screening quality, high screening cost, and heavy workload.

[0003] The Chinese invention patent "A belt-type screening conveyor device for a vibrating screen" with the authorization announcement number CN112691902B discloses a belt-type screening conveyor device for a vibrating screen, which is fixedly mounted on the screen box of the vibrating screen, the roller shafts at both ends of the driven roller are fixed on the side plates at the discharge end of the vibrating screen box, the roller shafts at both ends of the active roller are fixed on the side plates at the feeding end of the vibrating screen box, and a plurality of screening belts are sleeved on the active roller and the driven roller, each upward screening belt is mounted on the spacer sleeve of the upper roller assembly, and the downward screening belt is alternately mounted on the upper lower roller and the lower lower roller, so that each screening belt mounted on the lower roller assembly The gaps between the belts are larger than the gaps between each screening belt mounted on the upper roller assembly. The advantages are no hole blockage, high screening efficiency, and independent control of the throughput, which reduces the vibration mass of the vibrating screen and increases the overall service life of the vibrating screen. However, the vibration power source in this patent needs to drive the entire belt conveyor and the screen box to vibrate together, which requires a large excitation force, a large power source, and high cost. In addition, several screening belts are spliced ​​and staggered for screening, and the gap distance between the several screening belts cannot be guaranteed. The screening of needle-shaped and flaky material particles cannot be controlled, and the material needs to flush the screening belt twice to reach the bottom, which causes great wear on the screening belt.

[0004] The Chinese invention patent with the publication number CN110142199A "A Small Crawler Vibrating Screening Machine" discloses a small crawler vibrating screening machine, including a power vehicle and a screening mechanism arranged on the power vehicle; the screening mechanism includes a frame, a screen body, a feed belt conveyor, a lower discharge belt conveyor, a feed bin, a plurality of foldable belt conveyors, and a vibration power source; the screen body is installed in the frame, the vibration power source is installed on the screen body, the feed belt conveyor and the lower discharge belt conveyor are respectively installed on the upper and lower parts of the vibrating screen, the feed bin is installed on the feed belt conveyor, one end of the foldable belt conveyor is installed on the frame, and the other end When not working, it is folded and placed above the frame. The foldable belt conveyor is used to transport materials screened by the screen body; a control panel is provided on the frame, and the advantages are simple structure, reasonable design, small size, low cost, low energy consumption, high working efficiency, no need to disassemble during transfer, convenient transportation, fast entry speed and production speed, but the patent is the same as most screening machines, the screening machine and the belt conveyor are separately arranged, the material transportation in the screening machine adopts the screening box tilted at a certain angle, the excitation force of the vibration power source is decomposed, the energy supply of the vibration power source is weakened, the rated power required by the vibration power source is increased, the cost is high, the energy efficiency is low, the screening efficiency is low, the screening quality is poor, the screening cost is high, and the workload of personnel is large. Summary of the invention

[0005] In order to overcome the shortcomings of the prior art, the present invention provides a belt conveyor screening machine and a screening method. Holes are opened on a conveyor belt with a certain width to form a screening belt with a hole shape having a screening function. A vibrating knocker is arranged below the ascending screening belt. The ascending screening belt vibrates when passing over the vibrating knocker. The material on the ascending screening belt is vibrated and screened during the conveying process. The material smaller than the screen hole is screened out by the vibrating knocker and discharged along a guide plate. The material larger than the screen hole is discharged from the discharge end. The vibrating screening only vibrates the screening belt, and other structures do not vibrate. The screening belt rotates continuously in a closed loop in the belt conveyor screening machine, so as to realize the transportation of materials and the screening of materials at the same time.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A belt conveyor screening machine comprises a fixed frame, a conveyor screening belt, a vibrating knocker, a material guide plate and a reverse material guide plate, a reverse material guide plate is arranged at the lower part of the fixed frame, and a conveyor screening belt, a vibrating knocker and a material guide plate are arranged inside the fixed frame, the conveyor screening belt comprises a screening belt, the belt surface of the screening belt is provided with screening holes, the screening belt is divided into an ascending screening belt and a descending screening belt, the vibrating knocker is arranged between the ascending screening belt and the descending screening belt, the vibrating knocker comprises a vibration power source, a shock absorbing spring, a vibration hammer wheel and a vibration frame, the vibration frame fixes the vibration power source, the vibration hammer wheel and the shock absorbing spring, a plurality of the vibration power sources are evenly arranged along the material conveying direction, a plurality of shock absorbing springs are arranged on both sides of the vibration power source, a plurality of the vibration hammer wheels are contact-assembled on the lower surface of the ascending screening belt along the material conveying direction, and a material guide plate is arranged below the ascending screening belt.

[0008] Furthermore, the belt conveyor screening machine also includes a feed chute, an upper cover and a material baffle plate. The upper cover is arranged on the top of the fixed frame, the feed chute is arranged on the top of the fixed frame on the feeding side of the ascending screening belt, and the material baffle plate is arranged on both sides of the ascending screening belt along the material conveying direction.

[0009] Furthermore, the conveying and screening belt also includes a driving wheel, a motor, a driven wheel, a redirecting wheel, a compensating tensioning device and a supporting roller assembly. The driving wheel, the driven wheel, the redirecting wheel and the screening belt form a conveying closed loop. The supporting roller assembly is arranged on the lower belt surface of the descending screening belt, and the compensating tensioning device is provided with a spring buffer device.

[0010] Furthermore, the movable end of the shock absorbing spring is fixed on the vibration frame, and the fixed end of the shock absorbing spring is fixed on the fixed frame body.

[0011] Furthermore, a discharge port 1 and a discharge port 2 are arranged at the bottom of the fixed frame, the discharge port 1 is arranged below the discharge position, and the discharge port 2 is arranged at the bottom end of the reverse guide plate.

[0012] Furthermore, the guide plate is arranged in a herringbone shape below the upward screening belt, and the material is discharged to both sides along the herringbone guide plate surface over the downward screening belt.

[0013] Furthermore, the vibration parameters of the screening belt are: G=3-5g, where G is the vertical acceleration and g is the acceleration due to gravity.

[0014] Furthermore, the angle between the conveying direction of the screening belt and the vibration direction of the vibrating knocker is 75° to 105°.

[0015] Furthermore, the screening method of the belt conveyor screening machine comprises the following steps:

[0016] S1. The screening belt is sequentially wrapped around the driving wheel, the redirecting wheel and the driven wheel to form a closed loop. The closed loop formed by the screening belt is divided into an upward screening belt and a downward screening belt. Screening holes are arranged on the belt surface of the screening belt. The vibrating beater is arranged between the upward screening belt and the downward screening belt. The supporting wheel assembly is arranged on the lower surface of the downward screening belt to support the screening belt.

[0017] S2. The material falls from the feed chute onto the surface of the upward screening belt. The motor drives the driving wheel to rotate. The screening belt transports the material to the discharge position as the driving wheel rotates. A vibrating beater is arranged between the upward screening belt and the downward screening belt. The vibration of the vibration power source drives the vibration frame to vibrate. The fixed end of the shock-absorbing spring is fixed to the fixed frame, and the movable end of the shock-absorbing spring vibrates with the vibration frame.

[0018] S3, the vibration of the vibrating frame drives the vibration of the vibrating hammer wheel, the outer surface of the vibrating hammer wheel contacts the lower surface of the upward screening belt, the upward screening belt vibrates along with the vibration hammer wheel, the material on the upward screening belt leaks out from the screening holes of the screening belt along with the vibration, and the large particle material is transported to the discharge position along with the vibration;

[0019] S4, the leaked small particles pass through the upward screening belt, and the herringbone guide plate arranged below the upward screening belt guides the materials to both sides, and the materials pass over the downward screening belt along the plate surface of the herringbone guide plate and are discharged to both sides;

[0020] S5. Large particles fall from the discharging position and are discharged from the discharging port 1. Small particles are guided from both sides of the guide plate and gathered by the reverse guide plate and are discharged from the discharging port 2.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1) The weight of the vibrating knocker is only about 1 / 3 of the weight of the equipment. The overall operating energy consumption is reduced by half compared with the overall vibration screening product. The vibrating knocker only vibrates the screening belt, and the outer fixed frame does not vibrate. The vibration energy consumption is small, the exciting force requirement is reduced, the vibration load is small, the power of the vibration power source is reduced, the vibration screening cost is reduced, the screening quality is high, and the screening effect is good.

[0023] 2) The vibration direction of the vibrating beater is nearly perpendicular to the conveying direction of the screening belt. The exciting force of the vibration power source is completely transmitted to the screening belt for screening materials, with high screening efficiency and good screening effect.

[0024] 3) Except for the screening belt, other shell structures do not participate in the vibration, which makes it easier to achieve overall sealing. The upper cover is sealed during operation, which greatly reduces dust spillage, protects the surrounding ecological environment, improves the screening environment, and achieves safety, energy saving and environmental protection.

[0025] 4) The mass of the vibration is small, and the bearing load requirement for the equipment foundation is small. The screening belt transports materials horizontally, which reduces the height requirement of the screening space, reduces the length requirement of the feeding belt, saves the cost of supporting facilities, and the screening machine has a compact structure and reduced costs.

[0026] 5) The vibration power source operates under frequency conversion control, which improves work efficiency, has a good material screening effect, and can realize intelligent control.

[0027] 6) Since only the vibrating screening belt is used to screen the material, there is no need to consider the existing bearing limit speed and load-bearing capacity when manufacturing large-scale screening equipment, so that large-scale and multi-layered screening equipment can be manufactured and large-scale production operations can be realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural sectional view of the belt conveyor screening machine described in the present invention.

[0029] Figure 2 It is a structural side view of the belt conveyor screening machine described in the present invention.

[0030] Figure 3 This is the front view of the belt conveyor screening machine structure of the present invention (I).

[0031] Figure 4 This is the front view (II) of the belt conveyor screening machine structure of the present invention.

[0032] Figure 5 It is a schematic diagram of the screening belt mechanism described in the present invention.

[0033] In the figure: 1. Upward screening belt; 2. Baffle plate; 3. Screening hole; 4. Material; 5. Vibration direction; 6. Vibration frame; 7. Vibration hammer wheel; 8. Conveying direction; 9. Vibration knocker; 10. Driving wheel; 11. Motor base; 12. Vibration power source; 13. Shock-absorbing spring; 14. Driven wheel; 15. Guide plate; 16. Falling direction of small particle materials; 17. Upper cover; 18. Fixed frame; 19. Support wheel assembly; 20. Reverse guide plate; 21. Downward screening belt; 22. Feed chute; 23. Motor; 24. Compensation tensioning device; 25. Reversing wheel; 26. Discharge port 1; 27. Discharge port 2. DETAILED DESCRIPTION

[0034] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings:

[0035] like Figure 1-Figure 5As shown, a working principle of a belt conveyor screening machine is as follows: the vibration power source 12 of the vibrating knocker vibrates, the vibration power source 12 drives the vibration frame 6 to vibrate, the vibration hammer wheel 7 on the vibration frame 6 vibrates the upward screening belt 1, and during the vibration process, the material 4 on the upward screening belt 1, which is smaller than the sieve hole, passes through the screening hole 3 on the screening belt, and the falling direction 16 of the small particle material is to fall along the plate surface of the herringbone guide plate 15, and after passing over both sides of the downward screening belt 21, it is gathered by the reverse guide plate 20 and discharged through the discharge port 27, and the material 4 larger than the screening hole 3 is transported by the rotation of the screening belt and discharged from the discharge port 1 26 at the discharge position.

[0036] Example 1: Figure 1-Figure 3 , Figure 5As shown in the figure, a belt conveyor screen includes a fixed frame 18, a conveyor screen belt, a vibration knocker 9, a guide plate 15 and a reverse guide plate 20. The reverse guide plate 20 is arranged at the lower part of the fixed frame 18 and is located below the conveyor screen belt to gather the small particle materials 4 falling from the guide plate 15 above. Inside the fixed frame 18, there are a conveyor screen belt, a vibration knocker 9 and a guide plate 15. The conveyor screen belt includes a screen belt, which is mainly made of a rubber conveyor belt, polyurethane material or chain plate, etc., and can be made into a one-piece closed annular belt or can be made in sections and then connected by gluing or using string pins, belt clamps, etc. The surface of the screen belt is provided with screening holes 3. The screen belt is divided into an upward screening belt 1 and a downward screening belt 21. The screen belt is wound around between a driving wheel 10 and a driven wheel 14 to form a closed loop. Above the driving wheel 10 is the upward screening belt 1 for transporting materials 4, and the return belt below the driving wheel 10 is the downward screening belt 21. The vibration knocker 9 is arranged between the upward screening belt 1 and the downward screening belt 21. The vibration knocker 9 includes a vibration power source 12, a shock-absorbing spring 13, a vibration hammer body wheel 7 and a vibration frame 6. The vibration frame 6 fixes the vibration power source 12, the vibration hammer body wheel 7 and the shock-absorbing spring 13. The vibration power sources 12 are evenly arranged along the material 4 conveying direction 8. A number of shock-absorbing springs 13 are arranged before and after both sides of one vibration power source 12. A number of the vibration hammer body wheels 7 are in contact and assembled on the lower surface of the upward screening belt 1 along the material 4 conveying direction 8. The vibration knocker 9 knocks on the lower surface of the upward screening belt 1, and the upward screening belt 1 vibrates. The materials 4 on the upward screening belt 1 fall through the screening holes 3 smaller than the screening holes 3 under the action of vibration, realizing the screening of the materials 4. The power supply mode of the vibration power source 12 of the vibration knocker 9 can be provided by the rotation of an eccentric body, a mechanical jacking mechanism, hydraulic pressure or electromagnetic force, etc. The vibration motor of the vibration power source 12 realizes variable frequency speed control. The vibration power source 12 is fixed on the vibration frame 6 through a motor base 11. The vibration hammer body wheel 7 of the vibration knocker 9 is directly in contact with the lower surface of the upward screening belt 1. The contact surface between the vibration hammer body wheel 7 and the upward screening belt 1 is a rolling curved surface, which can transmit the exciting force while rolling without hindering the transmission and conveying of the screen belt for materials 4. The guide plate 15 is arranged below the upward screening belt 1. The guide plate 15 is arranged below the upward screening belt 1 and is fixed on the vibration frame 6. The two side plates of the guide plate 15 cross over the downward screening belt 21 below it. The falling materials 4 fall from both sides of the plate surface of the guide plate 15 over the downward screening belt 21 and into the reverse guide plate 20, and then are discharged from the second discharge port 27. The return downward screening belt 21 does not receive the falling materials 4, so there will be no material storage affecting the rotation of the screen belt, reducing the wear of the screen belt, and there is no need to drive the entire conveyor screen belt to vibrate, reducing the exciting force requirement and the power requirement of the vibration power source 12.

[0037] As Figure 2-Figure 3 As shown, further, the belt conveyor screening machine also includes a feed chute 22, an upper cover 17 and a baffle plate 2. The upper cover 17 is arranged on the top of the fixed frame 18. The fixed frame 18 does not participate in the screening vibration, which makes it easier to close the upper cover 17 and reduce dust overflow. The feed chute 22 is arranged on the top of the fixed frame 18 on the feeding side of the ascending screening belt 1, and the baffle plate 2 is arranged on both sides of the ascending screening belt 1 along the conveying direction of the material 4.

[0038] like Figure 3 As shown, further, the driving wheel 10, the driven wheel 14, the redirecting wheel 25 and the screening belt of the conveying screening belt form a conveying closed loop; the driving wheel 10 and the motor 23 are arranged at the discharging position, the driven wheel 14 is arranged at the feeding position, the supporting wheel assembly 19 is arranged at the lower belt surface of the descending screening belt 21, and the compensating tensioning device 24 is provided with a spring buffer device, which is arranged on the descending screening belt 21.

[0039] like Figure 1-Figure 3 As shown, further, the movable end of the shock-absorbing spring 13 is fixed on the vibration frame 6, and the fixed end of the shock-absorbing spring 13 is fixed on the fixed frame body 18. The vibration frame 6 vibrates along with the vibration of the vibration power source 12. One end of the shock-absorbing spring 13 on the vibration frame 6 is fixed on the fixed frame body 18, and the other end is connected to the vibration frame 6, so as to reduce the shock of the vibration frame 6 and improve the service life.

[0040] like Figure 3 As shown, further, a discharge port 1 26 and a discharge port 27 are arranged at the bottom of the fixed frame 18, the discharge port 1 26 is arranged below the discharge position, the discharge port 27 is arranged at the bottom of the reverse guide plate 20, and a reverse guide plate 20 is arranged at the top of the discharge port 27 to gather the falling small particle material 4, which can reduce the size of the discharge port 27 and realize a multi-stage belt conveyor screening machine. At the same time, due to the different processing volume and on-site environment, when the belt conveyor screening machine requires a longer screen surface, a belt conveyor is arranged at the bottom, and the reverse guide plate 20 can gather the length of the discharge port 27 to facilitate discharge.

[0041] like Figure 2 As shown, further, the guide plate 15 is arranged in a herringbone shape below the upward screening belt 1, and the material 4 passes over the downward screening belt 21 along the herringbone guide plate surface and is discharged to both sides.

[0042] Furthermore, the vibration parameters of the screening belt are: G=3~5g, where G is the vertical acceleration; g is the gravitational acceleration. The vibration power source 12 mainly vibrates the upward screening belt 1 and the material 4. Therefore, the power acting on the upward screening belt 1 is large, and the vertical acceleration of the vibration of the material 4 is greater than 3g. The vibration amplitude of the material 4 is large, and the screening effect is good.

[0043] Furthermore, the angle between the conveying direction 8 of the screening belt and the vibration direction 5 of the vibrating knocker 9 is 75° to 105°, the vibration direction 5 of the vibration power source 12 is almost perpendicular to the conveying direction 8 of the screening belt, and the exciting force is almost completely transmitted to the material 4 on the belt surface, thereby improving the screening efficiency and achieving a good screening effect.

[0044] Example 2: Figure 1-Figure 2 , Figure 4-Figure 5As shown, a belt conveyor screening machine includes a fixed frame 18, a conveyor screening belt, a vibrating knocker 9, a guide plate 15 and a reverse guide plate 20. The reverse guide plate 20 is arranged at the lower part of the fixed frame 18, and the reverse guide plate 20 is arranged below the conveyor screening belt to gather small particle materials 4 falling from the guide plate 15 above. The conveyor screening belt, the vibrating knocker 9 and the guide plate 15 are arranged inside the fixed frame 18. The conveyor screening belt includes a screening belt. The screening belt is mainly made of rubber conveyor belt, polyurethane material or chain plate, etc., and can be made into a closed annular belt formed at one time, or it can be made in sections and connected by gluing or using a pin shaft, belt clamp, etc.; the belt surface of the screening belt is provided with screening holes 3, so The screening belt is divided into an upward screening belt 1 and a downward screening belt 21. The screening belt is wrapped around the driving wheel 10 and the driven wheel 14 to form a closed circuit. The upward screening belt 1 for transporting materials 4 is above the driving wheel 10, and the return belt below the driving wheel 10 is the downward screening belt 21. The vibrating beater 9 is arranged between the upward screening belt 1 and the downward screening belt 21. The vibrating beater 9 includes a vibration power source 12, a shock absorbing spring 13, a vibration hammer wheel 7 and a vibration frame 6. The vibration frame 6 fixes the vibration power source 12, the vibration hammer wheel 7 and the shock absorbing spring 13. The vibration power source 12 is evenly arranged along the conveying direction 8 of the material 4. A plurality of shock absorbing springs 13 are arranged on both sides of a vibration power source 12. The vibrating hammer wheel 7 is contacted and assembled on the lower surface of the upward screening belt 1 along the conveying direction 8 of the material 4, and the vibrating knocker 9 vibrates and knocks on the lower surface of the upward screening belt 1. The upward screening belt 1 vibrates, and the material 4 on the upward screening belt 1 that is smaller than the screening hole 3 falls through the screening hole 3 under the action of vibration, thereby realizing the screening of the material 4. The power supply mode of the vibration power source 12 of the vibrating knocker 9 can be provided by eccentric body rotation, mechanical jacking mechanism, hydraulic or electromagnetic force, etc. The vibration motor of the vibration power source 12 realizes variable frequency speed control, and the vibration power source 12 is fixed on the vibration frame 6 through the motor base 11. The vibrating hammer wheel 7 of the vibrating knocker 9 is directly in contact with the lower surface of the upward screening belt 1, and the vibrating hammer wheel 7 is in contact with the upper screening belt 1. The contact surface of the screening belt 1 is a rolling curved surface. While transmitting the exciting force, the rolling does not hinder the screening belt from driving and conveying the material 4. A guide plate 15 is arranged under the upward screening belt 1. The guide plate 15 is arranged under the upward screening belt 1 and fixed on the vibration frame 6. The two side plate surfaces of the guide plate 15 pass over the downward screening belt 21 below it. The fallen material 4 passes over the downward screening belt 21 from both sides of the plate surface of the guide plate 15 and falls into the reverse guide plate 20, and then is discharged from the discharge port 27. The downward screening belt 21 on the return journey does not receive the fallen material 4, so there is no material storage to affect the rotation of the screening belt, thereby reducing the wear of the screening belt and there is no need to drive the entire conveying screening belt to vibrate, thereby reducing the exciting force requirement and the power requirement of the vibration power source 12.

[0045] like Figure 2 , Figure 4 As shown, further, the belt conveyor screening machine also includes a feed chute 22, an upper cover 17 and a baffle plate 2. The upper cover 17 is arranged on the top of the fixed frame 18. The fixed frame 18 does not participate in the screening vibration, which makes it easier to close the upper cover 17 and reduce dust overflow. The feed chute 22 is arranged on the top of the fixed frame 18 on the feeding side of the ascending screening belt 1, and the baffle plate 2 is arranged on both sides of the ascending screening belt 1 along the conveying direction of the material 4.

[0046] like Figure 4 As shown, further, the driving wheel 10, the driven wheel 14, the redirecting wheel 25 and the screening belt of the conveying screening belt form a conveying closed loop; the driving wheel 10 and the motor 23 are arranged at the discharging position, the driven wheel 14 is arranged at the feeding position, the supporting wheel assembly 19 is arranged on the lower belt surface of the descending screening belt 21, and the compensating tensioning device 24 is provided with a spring buffer device, which is arranged on one side of the driven wheel 14.

[0047] like Figure 1 , Figure 4 As shown, further, the movable end of the shock-absorbing spring 13 is fixed on the vibration frame 6, and the fixed end of the shock-absorbing spring 13 is fixed on the fixed frame body 18. The vibration frame 6 vibrates along with the vibration of the vibration power source 12. One end of the shock-absorbing spring 13 on the vibration frame 6 is fixed on the fixed frame body 18, and the other end is connected to the vibration frame 6, so as to reduce the shock of the vibration frame 6 and improve the service life.

[0048] like Figure 4 As shown, further, a discharge port 1 26 and a discharge port 27 are arranged at the bottom of the fixed frame 18, the discharge port 1 26 is arranged below the discharge position, the discharge port 27 is arranged at the bottom of the reverse guide plate 20, and a reverse guide plate 20 is arranged at the top of the discharge port 27 to gather the falling small particle material 4, which can reduce the size of the discharge port 27 and realize a multi-stage belt conveyor screening machine. At the same time, due to the different processing volume and on-site environment, when the belt conveyor screening machine requires a longer screen surface, a belt conveyor is arranged at the bottom, and the reverse guide plate 20 can gather the length of the discharge port 27 to facilitate discharge.

[0049] like Figure 2 As shown, further, the guide plate 15 is arranged in a herringbone shape below the upward screening belt 1, and the material 4 passes over the downward screening belt 21 along the herringbone guide plate surface and is discharged to both sides.

[0050] Furthermore, the vibration parameters of the screening belt are: G=3~5g, where G is the vertical acceleration; g is the gravitational acceleration. The vibration power source 12 mainly vibrates the upward screening belt 1 and the material 4. Therefore, the power acting on the upward screening belt 1 is large, and the vertical acceleration of the vibration of the material 4 is greater than 3g. The vibration amplitude of the material 4 is large, and the screening effect is good.

[0051] Furthermore, the angle between the conveying direction 8 of the screening belt and the vibration direction 5 of the vibrating knocker 9 is 75° to 105°, the vibration direction 5 of the vibration power source 12 is almost perpendicular to the conveying direction 8 of the screening belt, and the exciting force is almost completely transmitted to the material 4 on the belt surface, thereby improving the screening efficiency and achieving a good screening effect.

[0052] like Figure 1-Figure 5 As shown, further, the screening method of the belt conveyor screening machine includes the following steps:

[0053] S1, the screening belt is sequentially wrapped around the driving wheel 10, the redirecting wheel 25 and the driven wheel 14 to form a closed loop, and the closed loop formed by the screening belt is divided into an upward screening belt 1 and a downward screening belt 21, and screening holes 3 are arranged on the belt surface of the screening belt, and the vibrating beater 9 is arranged between the upward screening belt 1 and the downward screening belt 21, and the supporting wheel assembly 19 is arranged on the lower surface of the downward screening belt 21 to support the screening belt;

[0054] S2, the material 4 falls from the feed chute 22 onto the belt surface of the upward screening belt 1, the motor 23 drives the driving wheel 10 to rotate, and the screening belt transports the material 4 to the discharge position as the driving wheel 10 rotates. A vibrating beater 9 is arranged between the upward screening belt 1 and the downward screening belt 21, and the vibration power source 12 vibrates to drive the vibration frame 6 to vibrate. The fixed end of the shock-absorbing spring 13 is fixed to the fixed frame 18, and the movable end of the shock-absorbing spring 13 vibrates with the vibration frame 6;

[0055] S3, the vibration of the vibration frame 6 drives the vibration hammer wheel 7 to vibrate, the outer surface of the vibration hammer wheel 7 contacts the lower surface of the upward screening belt 1, the upward screening belt 1 vibrates with the vibration hammer wheel 7, the material 4 on the upward screening belt 1 vibrates, the small particle material 4 leaks from the screening hole 3 of the screening belt, and the large particle material 4 is transported to the discharge position with the vibration;

[0056] S4, the leaked small particles pass through the upward screening belt 1, and the herringbone guide plate 15 arranged below the upward screening belt 1 guides the materials 4 to both sides, and the materials 4 pass over the downward screening belt 21 along the plate surface of the herringbone guide plate 15 and are discharged to both sides;

[0057] S5, the large particle material 4 falls from the discharging position and is discharged from the discharging port 1 26, and the small particle material is guided from both sides of the guide plate 15 and gathered by the reverse guide plate 20 and is discharged from the discharging port 2 27.

[0058] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A belt conveyor screening machine, comprising a fixed frame, a conveyor screening belt, a vibrating beater, a guide plate and a reverse guide plate, wherein a reverse guide plate is arranged at the lower part of the fixed frame, characterized in that: A conveying and screening belt, a vibrating knocker and a material guide plate are arranged inside the fixed frame. The conveying and screening belt includes a screening belt, and screening holes are arranged on the belt surface of the screening belt. The screening belt is divided into an ascending screening belt and a descending screening belt. The vibrating knocker is arranged between the ascending screening belt and the descending screening belt. The vibrating knocker includes a vibration power source, a shock-absorbing spring, a vibration hammer wheel and a vibration frame. The vibration frame fixes the vibration power source, the vibration hammer wheel and the shock-absorbing spring. Several vibration power sources are evenly arranged along the material conveying direction. Several shock-absorbing springs are arranged on both sides of the vibration power source. Several vibration hammer wheels are contact-assembled on the lower surface of the ascending screening belt along the material conveying direction, and a material guide plate is arranged below the ascending screening belt.

2. A belt conveyor screening machine according to claim 1, characterized in that: The belt conveyor screening machine also includes a feed chute, an upper cover and a material baffle plate. The upper cover is arranged on the top of the fixed frame, the feed chute is arranged on the top of the fixed frame on the feeding side of the ascending screening belt, and the material baffle plate is arranged on both sides of the ascending screening belt along the material conveying direction.

3. A belt conveyor screening machine according to claim 1, characterized in that: The conveying and screening belt also includes a driving wheel, a motor, a driven wheel, a redirecting wheel, a compensating tensioning device and a supporting roller assembly. The driving wheel, the driven wheel, the redirecting wheel and the screening belt form a conveying closed loop. The supporting roller assembly is arranged on the lower belt surface of the descending screening belt, and the compensating tensioning device is provided with a spring buffer device.

4. A belt conveyor screening machine according to claim 1, characterized in that: The movable end of the shock absorbing spring is fixed on the vibration frame, and the fixed end of the shock absorbing spring is fixed on the fixed frame body.

5. The belt conveyor screening machine according to claim 1, characterized in that: A discharge port 1 and a discharge port 2 are arranged at the bottom of the fixed frame, wherein the discharge port 1 is arranged below the discharge position, and the discharge port 2 is arranged at the bottom end of the reverse guide plate.

6. A belt conveyor screening machine according to claim 1, characterized in that: The guide plate is arranged in a herringbone shape below the upward screening belt, and the material is discharged to both sides along the surface of the herringbone guide plate over the downward screening belt.

7. The belt conveyor screening machine according to claim 1, characterized in that: The vibration parameters of the screening belt are: G=3-5g, where G is the vertical acceleration and g is the acceleration due to gravity.

8. The belt conveyor screening machine according to claim 1, characterized in that: The angle between the conveying direction of the screening belt and the vibration direction of the vibrating knocker is 75° to 105°.

9. A screening method for a belt conveyor screening machine according to claim 1, characterized in that: The screening method of the belt conveyor screening machine comprises the following steps: S1. The screening belt is sequentially wrapped around the driving wheel, the redirecting wheel and the driven wheel to form a closed loop. The closed loop formed by the screening belt is divided into an upward screening belt and a downward screening belt. Screening holes are arranged on the belt surface of the screening belt. The vibrating beater is arranged between the upward screening belt and the downward screening belt. The supporting wheel assembly is arranged on the lower surface of the downward screening belt to support the screening belt. S2. The material falls from the feed chute onto the surface of the upward screening belt. The motor drives the driving wheel to rotate. The screening belt transports the material to the discharge position as the driving wheel rotates. A vibrating beater is arranged between the upward screening belt and the downward screening belt. The vibration of the vibration power source drives the vibration frame to vibrate. The fixed end of the shock-absorbing spring is fixed to the fixed frame, and the movable end of the shock-absorbing spring vibrates with the vibration frame. S3. The vibration of the vibrating frame drives the vibration of the vibrating hammer wheel. The outer surface of the vibrating hammer wheel contacts the lower surface of the upward screening belt. The upward screening belt vibrates along with the vibration hammer wheel. The materials on the upward screening belt vibrate along with the vibration. Small particles of materials leak out from the screening holes of the screening belt, and large particles of materials are transported to the discharge position along with the vibration. S4, the leaked small particles pass through the upward screening belt, and the herringbone guide plate arranged below the upward screening belt guides the materials to both sides, and the materials pass over the downward screening belt along the plate surface of the herringbone guide plate and are discharged to both sides; S5. Large particles fall from the discharging position and are discharged from the discharging port 1. Small particles are guided from both sides of the guide plate and gathered by the reverse guide plate and are discharged from the discharging port 2.

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