A screening machine for fine gravel

Abstract

This invention discloses a screening machine for fine sand and gravel, belonging to the field of screening technology. The screening machine includes a screening box with a vibration function, and an inclined screen plate is fixedly installed in the inner cavity of the screening box. Multiple support bars are installed on the surface of the screen plate, and a screen channel is formed between any two adjacent support bars. Several screen holes are provided at the bottom of the screen channel. Breaking bars are installed on both sides of the middle section of the screen channel. The breaking bars on both sides of the same screen channel will move relative to each other as the screening box vibrates. During the screening process, smaller particles will fall into the screen channel, while larger particles will roll along the slide and be discharged outwards through the discharge port, reducing the risk of screen channel blockage.

Description

Technical Field

[0001] This invention relates to a screening machine for fine sand and gravel, belonging to the technical field of screening machines. Background Technology

[0002] The screening of sand and gravel is mainly used to control the quality of sand and gravel aggregates. Screening is generally carried out using a screening machine. The screen plate in the screening machine is mainly used to screen or separate materials. Materials are screened according to particle size through screen holes of different mesh sizes, allowing materials of different sizes to be separated. However, in the screening process of conventional screen plates, because the screen plate has several screen holes, the screen holes also hinder the movement of materials on the screen plate during the separation process, resulting in high friction and slow screening speed. Furthermore, since the materials are not standard spheres, when the material shape is irregular, the material will get stuck in the screen holes. When this happens, the material will accumulate on the surface of the screen plate, affecting the screening quality. Therefore, although conventional screening machines have screening functions, the screening speed is slow and the screening effect is poor. To solve this problem, this invention provides a screening machine for fine sand and gravel. Summary of the Invention

[0003] To address the problems existing in the prior art, the present invention provides a screening machine for fine sand and gravel, which can solve the problems of material stockpiling and low working efficiency.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a screening machine for fine sand and gravel, the screening machine including a screening box with vibration function, wherein inclined screen plates are fixedly installed in the inner cavity of the screening box.

[0005] The surface of the sieve plate is equipped with multiple support bars, and a sieve channel is formed between any two adjacent support bars. The bottom of the sieve channel is provided with several sieve holes.

[0006] Both sides of the middle section of the screen channel are equipped with crushing bars, and the crushing bars on both sides of the same screen channel will move relative to each other as the screening box vibrates.

[0007] Preferably, both crushing bars have crushing surfaces on their opposite sidewalls, and the distance between the two crushing surfaces gradually increases along the direction of material movement.

[0008] Preferably, the two crushing bars in the same screen channel are an active bar and a fixed bar, respectively. The active bar is slidably installed on the side wall of the corresponding support bar, and the fixed bar is fixedly installed on the corresponding support bar.

[0009] Preferably, the two ends of the screening box are connected to a plurality of support shafts, the active bar is sleeved on the support shafts, and an elastic body is sleeved on both ends of the active bar on the outside of the support shafts.

[0010] Preferably, the two crushing bars in the same screen channel are side ribs fixedly installed on the support bar, the side ribs and the support bar are integrally formed, and the support bar is slidably installed on the surface of the screen plate.

[0011] Preferably, the weights of any two adjacent support bars are different.

[0012] Preferably, the two ends of the screening box are connected to a plurality of support shafts, the support strip is sleeved on the outside of the support shafts, and elastic bodies are sleeved on both ends of the support shafts.

[0013] Preferably, the support strip is in the shape of a long strip plate, and both sides of the upper end of the support strip are provided with strip-shaped parts that protrude to both sides, and two adjacent strip-shaped parts form a slide for fine sand and gravel to roll.

[0014] Preferably, the screening box is mounted on a support, and both ends of the support are connected to the screening box via support springs. A drive device for driving the screening box to vibrate is installed in the middle of the support. The screening box has a vibration chamber with an open top. A screen plate is installed inside the vibration chamber. A partition is installed at the bottom of the inclined lower end of the screen plate. The screen plate and the partition divide the vibration chamber into multiple screening chambers, and each screening chamber is connected to a corresponding discharge port.

[0015] Preferably, there are multiple screen plates arranged vertically. When the number of screen plates is n, the screen plates and the partitions at their bottoms divide the vibration chamber into n+1 screening chambers, and each screening chamber is connected to a discharge port.

[0016] Compared with the prior art, the present invention sets a screen channel on the screen plate. During the screening process, smaller particles of material fall into the screen channel, while larger particles roll along the slide and are discharged outward through the discharge port. Compared with the ordinary screen plate screening method, this screening method can discharge larger particles in a short time, while smaller particles fall into the screen channel. The crushing plates set on both sides of the screen channel can crush materials that may clog the screen holes in advance, thereby reducing the risk of screen blockage. In addition, there is an opening angle between the two crushing plates, which can prevent materials from getting stuck in the gaps of the crushing device. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention.

[0018] Figure 2 This is the front view of the present invention.

[0019] Figure 3 This is a schematic diagram of the internal structure of the screening box of the present invention.

[0020] Figure 4This is a schematic diagram of the discharge structure of the sieve plate of the present invention.

[0021] Figure 5 This is a partial cross-sectional view of the sieve plate in Embodiment 1 of the present invention.

[0022] Figure 6 For the present invention Figure 5 Sectional view at point AA.

[0023] Figure 7 This is a partial cross-sectional view of the sieve plate in Embodiment 2 of the present invention.

[0024] In the diagram: 1. Support frame, 2. Support spring, 3. Discharge port, 4. Screening box, 5. Cover plate, 6. Drive device, 7. First screening chamber, 8. Second screening chamber, 9. Third screening chamber, 10. Elastomer one, 11. Support bar, 12. Screen channel, 13. Fixing bar, 14. Screen hole, 15. Drive bar, 16. Screen plate, 17. Support shaft one, 18. Side rib, 19. Support shaft two, 20. Elastomer two. Detailed Implementation

[0025] The present invention is illustrated below with specific embodiments, but these are not intended to limit the invention.

[0026] Example 1

[0027] like Figures 1-6As shown in this embodiment, a fine sand and gravel screening machine is provided, which includes a vibrating screening box 4 mounted on a support 1. Both ends of the support 1 are connected to the screening box 4 via support springs 2. A driving device 6 for driving the screening box 4 to vibrate is installed in the middle of the support 1. Triangular supports 1 are mounted on both the support 1 and the screening box 4. Two corresponding triangular supports 1 have two parallel mounting surfaces, and the vertical projection of any one mounting surface overlaps with the other mounting surface. The two ends of the support springs 2 are respectively mounted on the two mounting surfaces, and multiple support springs 2 can be connected between two corresponding mounting surfaces. The number of support springs 2 is selected according to the weight of the screening box 4; the heavier the screening box 4, the more support springs 2 are required. The number of support springs 2 is greater than two. When the number of support springs 2 is even, the support springs 2 are arranged symmetrically left and right along the length of the bracket 1. When the number of support springs 2 is odd, one support spring 2 is connected to the middle of the bracket 1, and the remaining support springs 2 are arranged symmetrically. The drive device 6 is fixed to the middle of the bracket 1, and the other end of the drive device 6 is connected to the bottom of the screening box 4. The drive device 6 can be driven by various means, such as cam or cylinder, to ensure that the screening box 4 moves regularly or irregularly relative to the bracket 1. In this embodiment, the drive method is hydraulic cylinder drive. A hinged connecting rod is installed on the bracket 1, and a hydraulic cylinder is fixed to the bottom of the screening box 4. The output end of the hydraulic cylinder is connected to the end of the connecting rod. The screen box 4 is hinged, and when the hydraulic cylinder makes an extension-retraction-extension motion, it drives the screening box 4 to make a regular movement. The screening box 4 has a vibrating chamber with an open top. The bottom of the vibrating chamber is inclined, allowing materials to move along the bottom and be discharged. A cover plate 5 can be installed on the upper end of the vibrating chamber, and a feed pipe can be connected to the cover plate 5 to supply materials to the device. An inclined screen plate 16 is connected inside the vibrating chamber. The material feed end is the higher end of the screen plate 16. When materials fall onto the screen plate 16, the screen plate 16 shakes with the screening box 4. Larger particles slide down the screen plate 16, while smaller particles fall through the screen holes 14 of the screen plate 16. A baffle is installed at the bottom of the screen plate 16, and a discharge port is installed at the bottom of the screening box 4. There are multiple sieve plates 16 arranged vertically. When there are two sieve plates 16, the sieve plate 16 and its bottom partition divide the vibrating chamber into three screening chambers. Each screening chamber is connected to a corresponding discharge port 3. Larger particles screened out by the sieve plate 16 roll down the sieve plate 16 and fall into the discharge port 3, where they are discharged outwards. Workers only need to collect them at the bottom of the multiple discharge ports 3. The sieve plate 16 and the partition divide the vibrating chamber into multiple screening chambers, each of which is connected to a corresponding discharge port 3. The discharge port 3 and the screening chamber are one-to-one, and the multiple screening chambers are independent of each other. The upper screening chamber can only drop through the sieve holes 14 on the sieve plate 16 into the screening chamber at its bottom. Figure 3 and Figure 4In this embodiment, two sieve plates 16 are provided. The two sieve plates 16 divide the vibration chamber into a first screening chamber 7, a second screening chamber 8 and a third screening chamber 9. The material in the first screening chamber 7 can enter the second screening chamber 8 through the upper sieve plate 16, and the material in the second screening chamber 8 can enter the third screening chamber 9 through the lower sieve plate 16, thereby completing the screening function.

[0028] The diameter of the sieve hole 14 on the sieve plate 16 is larger than the diameter of the sieve hole 14 on the sieve plate 16 at its bottom, and the distance between the two crushing bars is smaller than the diameter of the sieve hole 14. The diameter of the material screened out by multiple screening chambers will decrease sequentially.

[0029] Multiple screen channels 12 are provided on the surface of the screen plate 16 along its length. The screen channels 12 are arranged on the upper surface of the screen plate 16 along its length. Multiple screen holes 14 are provided at the bottom of each screen channel 12. The shortest distance between two support bars 11 is less than the maximum diameter of the screen hole 14. When the diameter of the granular material is less than the distance between the two support bars 11, it will fall into the screen channel 12 and pass through the screen holes 14 at the bottom of the screen channel 12, falling into the bottom screening chamber.

[0030] Combination Figure 5 and Figure 6 Both crushing bars have crushing surfaces on their opposite sidewalls. The distance between the two crushing surfaces gradually increases along the direction of material movement. There is an included angle between the two crushing bars, which is conical. The opening of the screen channel 12 increases along with the movement of the material, which can prevent the material from clogging inside the screen channel 12 and reduce the risk of clogging. When the material falls between the two crushing bars, the space at the front end of the crushing bars is small, which can crush larger materials. After the material moves down a certain distance, the space increases, and the crushed material will fall to the bottom of the screen channel 12 and be discharged from the screen hole 14.

[0031] The support bar 11 is a long strip plate. Both sides of the upper end of the support bar 11 are provided with strip-shaped parts that protrude to both sides. Two adjacent strip-shaped parts form a slide for fine sand and gravel to roll. Larger particles of material can move along the slide.

[0032] The two crushing bars in the same screen channel 12 are the active bar 15 and the fixed bar 13. The active bar 15 is slidably installed on the side wall of the corresponding support bar 11, and the fixed bar 13 is fixedly installed on the corresponding support bar 11. Several support shafts 17 are connected to both ends of the screening box 4. The active bar 15 is sleeved on the support shafts 17. The outer side of the support shafts 17 is fitted with elastic bodies 10 at both ends of the active bar 15. The elastic bodies 10 ensure that the active bar 15 is arranged in the middle of the support bar 11 in the normal state. When the screening box 4 vibrates, the active bar 15 will move back and forth. In this embodiment, when the screening box 4 vibrates, the active bar 15 will move back and forth with the vibration of the screening box 4. The active bar 15 and the fixed bar 13 are relatively displaced. Crushing surfaces are provided on the two opposite side walls of the active bar 15 and the fixed bar 13. When the particle shape is irregular, the particle is elliptical. Irregularly shaped materials will block the screen holes 14. The crushing bars will crush the materials, thereby avoiding the screen holes 14 from being blocked.

[0033] Example 2

[0034] like Figures 1-4 and Figure 7 As shown, based on Embodiment 1, the crushing strips inside the sieve channel 12 are replaced with two side ribs 18 fixedly mounted on the support strip 11 within the same sieve channel 12. The side ribs 18 and the support strip 11 are integrally formed, and the support strip 11 is slidably mounted on the surface of the sieve plate 16. The weights of any two adjacent support strips 11 are different. Several support shafts 19 are connected to both ends of the screening box 4. Support bars 11 are sleeved on the outside of the support shafts 19. Elastic bodies 20 are sleeved on both ends of the support bars 11 on the outside of the support shafts 19. In this embodiment, the support bars 11 on both sides of any screen channel 12 will move, and the weights of the two support bars 11 are different, so they will displace each other, thereby completing the crushing. In this embodiment, there is an included angle between the two crushing bars and they are conical. When the material is pushed to move in the direction in which the crushing bars open, it is difficult for the material to return to the initial position. Therefore, it will continue to move in the direction in which the crushing bars open. When the crushing bars lose their clamping force on the material, it will fall into the screen channel 12 and fall from the screen hole 14 into the next screening chamber.

[0035] In use: The material is poured from the top of the screen plate 16 onto the surface of the uppermost screen plate 16. During the vibration of the screening box 4, smaller particles will enter the screen channel 12 first, while larger particles will roll down along the slide. The larger particles will not encounter any obstruction during the rolling process and will fall at a faster speed. Since the shape of the material is not entirely round, irregularly shaped materials may get stuck at the screen holes 14. The crushing bars on both sides will crush such materials that are blocking the screen holes 14. After being crushed, they can fall smoothly from the screen holes 14 and be discharged outward through the discharge port 3. Multiple screen plates 16 can perform multi-stage screening of materials to complete the screening work. In this screening machine, larger particles are not obstructed during screening, so the screening speed is faster than that of ordinary screens, thus improving screening efficiency.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate and not limit the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the present invention without departing from the spirit and scope of the present invention. Any modifications or partial substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A screening machine for fine sand and gravel, characterized in that, The screening machine includes a screening box (4) with vibration function, and an inclined sieve plate (16) is fixedly installed in the inner cavity of the screening box (4). The surface of the sieve plate (16) is equipped with multiple support bars (11), and a sieve channel (12) is formed between any two adjacent support bars (11). The bottom of the sieve channel (12) is provided with a number of sieve holes (14). Both sides of the middle section of the screen channel (12) are equipped with crushing bars. The crushing bars on both sides of the same screen channel (12) will move relative to each other as the screening box (4) vibrates. Both crushing bars have crushing surfaces on their opposite sidewalls, and the distance between the two crushing surfaces gradually increases along the direction of material movement. The two crushing bars in the same screen channel (12) are an active bar (15) and a fixed bar (13). The active bar (15) is slidably installed on the side wall of the corresponding support bar (11), and the fixed bar (13) is fixedly installed on the corresponding support bar (11). The screening box (4) is connected to several support shafts (17) at both ends. The active bar (15) is sleeved on the support shafts (17). The support shafts (17) are sleeved on both ends of the active bar (15) at both ends.

2. The screening machine for fine sand and gravel according to claim 1, characterized in that, The two crushing bars in the same screen channel (12) are both side ribs (18) fixedly installed on the support bar (11). The side ribs (18) and the support bar (11) are integrally formed. The support bar (11) is slidably installed on the surface of the screen plate (16).

3. A screening machine for fine sand and gravel according to claim 2, characterized in that, The weights of any two adjacent support bars (11) are different.

4. A screening machine for fine sand and gravel according to claim 3, characterized in that, The screening box (4) is connected to several support shafts (19) at both ends. The support bar (11) is sleeved on the outside of the support shaft (19). The outside of the support shaft (19) is sleeved on both ends of the support bar (11) with an elastic body (20).

5. A screening machine for fine sand and gravel according to claim 1, characterized in that, The support bar (11) is a long strip plate. Both sides of the upper end of the support bar (11) are provided with strip-shaped parts that protrude to both sides. Two adjacent strip-shaped parts form a slide for fine sand and gravel to roll.

6. A screening machine for fine sand and gravel according to claim 1, characterized in that, The screening box (4) is mounted on the support (1). The two ends of the support (1) are connected to the screening box (4) by support springs (2). The middle part of the support (1) is equipped with a drive device (6) for driving the screening box (4) to vibrate. The screening box (4) has a vibration chamber with an open top. The screen plate (16) is installed inside the vibration chamber. The bottom of the lower end of the screen plate (16) is equipped with a partition. The screen plate (16) and the partition divide the vibration chamber into multiple screening chambers. Each screening chamber is connected to the corresponding discharge port (3).

7. A screening machine for fine sand and gravel according to claim 6, characterized in that, The number of sieve plates (16) is multiple, and the multiple sieve plates (16) are arranged vertically. When the number of sieve plates (16) is n, the sieve plates (16) and the partitions at their bottoms divide the vibration chamber into n+1 screening chambers, and each screening chamber is connected to a discharge port (3).

Images