Device for reducing content of finished aggregate needle pieces

Abstract

The device comprises a base, a treatment box and a screening box which are sequentially connected from bottom to top, the treatment box and the base are supported and fixed through supporting legs, and a shaping crusher is arranged in the center of the base; a feeding hopper is arranged at the top of the screening box, a first circular screen structure and a second circular screen structure which are obliquely arranged are laid in the screening box in a layered mode, aggregate screened by the first circular screen structure enters the treatment box through a first feeding pipe, and aggregate screened by the second circular screen structure enters the treatment box through a second feeding pipe; two screen frames which are symmetrically distributed are arranged in the treatment box, and aggregate and needle-shaped aggregate with qualified sizes can be screened through special structures in the screen frames; a collecting frame, a collecting hopper and a discharging pipe which are of an integrated structure and are sequentially connected from top to bottom are arranged in the center of the bottom of the treatment box, and the collecting frame is used for collecting needle-shaped aggregate screened in the treatment box. The needle-shaped aggregate screening device has the advantages of being reasonable in structural design, convenient to operate and maintain and capable of improving the needle-shaped aggregate screening effect.

Description

Technical Field

[0001] This invention relates to the field of sand and gravel aggregate processing technology, specifically to a device for reducing the content of needle-shaped and flake-shaped aggregates in finished products. Background Technology

[0002] With the increasing demand for sand and gravel aggregates in domestic infrastructure construction, the development and utilization of sand and gravel aggregate resources is in a period of rapid industry growth. Mechanized crushed stone is a major raw material for concrete, and a high content of needle-shaped and flaky particles directly affects the compressive strength of cemented gravel. Therefore, controlling the content of needle-shaped and flaky particles is one of the effective ways to reduce the porosity of manufactured crushed stone and improve concrete performance.

[0003] Currently, to reduce the content of needle-shaped and flaky particles in machine-made crushed stone and optimize its particle shape, machine-made crushed stone can be added to the ore, and the product's edges and corners can be ground through a shaping process. However, during the shaping process, most aggregates that meet the standard particle shape requirements are re-ground and crushed along with irregular particles by the crusher, resulting in a significant waste of raw materials and energy. In addition, the screen openings in existing equipment are rectangular. Due to the slender shape of needle-shaped aggregates, some needle-shaped aggregates may longitudinally insert into and pass through the screen openings during vibrating screening, resulting in a generally poor screening effect for needle-shaped and flaky aggregates. Summary of the Invention

[0004] The purpose of this invention is to provide a device that reduces the content of needle-shaped aggregates in finished aggregates, which has a reasonable structural design, is easy to operate and maintain, improves the screening effect of needle-shaped aggregates, facilitates screening sampling and observation, and ensures the quality of screening work.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: A device for reducing the content of needle-shaped and flaky aggregates in finished products includes a base, a processing box, and a screening box connected in sequence from bottom to top. The processing box is supported and fixed to the base by support legs, and a shaping crusher is provided at the center of the base. The top of the screening box is equipped with a feeding hopper. The screening box is filled with a first circular screen structure and a second circular screen structure arranged at an inclination. The aggregate screened by the first circular screen structure enters the processing box through the first feeding pipe, and the aggregate screened by the second circular screen structure enters the processing box through the second feeding pipe. The processing box is equipped with two symmetrically distributed screen frames. Each screen frame has a top that is inclined towards the center and a strip screen structure is embedded in the top. The screen frame is equipped with a limiting plate parallel to the strip screen structure and a cylinder structure that controls the lifting and lowering of the limiting plate. The bottom of the screen frame is funnel-shaped and its bottom center is connected to the discharge pipe. The bottom of the screen frame near the center of the processing box is equipped with a discharge channel with a sealing structure. The lower side of the limiting plate is equipped with a shielding strip near the sealing structure. The shielding strip is located between the sealing structure and the cylinder structure. The bottom center of the processing box is provided with an integral structure consisting of a collection frame, a collection hopper, and a discharge pipe connected sequentially from top to bottom. The collection frame is used to collect the aggregate discharged from the discharge channel, and the discharge pipe passes through the bottom plate of the processing box and faces the shaping crusher.

[0006] Furthermore, the first or second circular screen structure includes a circular screen and a vibrating motor fixedly connected to its bottom surface; the strip screen structure includes a strip screen and a vibrating motor fixedly connected to its bottom surface.

[0007] Furthermore, the sealing structure includes a connecting rod and a blocking block. One end of the connecting rod is connected to the lower side of the limiting plate, and the other end is connected to the blocking block. The blocking block is inserted into the discharge opening at the top of the discharge channel.

[0008] Furthermore, the collection frame is provided with a sampling structure, which includes two baffles arranged in pairs. The two baffles can block the aggregate from flowing down when they are joined together. The baffles have a pull plate at the outward end and a limiting block at the inward end. The limiting blocks are magnetically attracted to each other.

[0009] Compared with the prior art, the present invention has the following advantages: This invention relates to a device for reducing the content of needle-shaped aggregates in finished aggregates. It has a reasonable structural design, is easy to operate and maintain, improves the screening effect of needle-shaped aggregates, facilitates screening sampling and observation, and ensures the quality of screening work. Attached Figure Description

[0010] Figure 1 This is an external schematic diagram of the overall structure of the present invention.

[0011] Figure 2 This is a cross-sectional view of the overall structure of the present invention.

[0012] Figure 3 This is a cross-sectional view of the sieve frame structure of the present invention.

[0013] Figure 4 yes Figure 3 Enlarged schematic diagram of the structure at point A in the middle.

[0014] Figure 5 This is a cross-sectional view of the collection frame structure of the present invention.

[0015] Reference numerals: 1. Processing box; 2. Base; 3. Support leg; 4. Screening box; 41. First circular screen; 42. Second circular screen; 43. First feed pipe; 44. Second feed pipe; 45. Valve; 46. Feed hopper; 5. Screen frame; 6. First strip screen; 7. Second strip screen; 8. Connecting plate; 9. Cylinder structure; 10. Limiting plate; 11. Collection hopper; 12. Discharge pipe; 13. Shaping crusher; 14. Sampling structure; 141. Collection frame; 142. Baffle; 143. Limiting block; 144. Pulling plate; 15. Discharge pipe; 16. Discharge opening; 17. Discharge channel; 18. Connecting rod; 19. Blocking block; 20. Shielding strip; 21. Box door. Detailed Implementation

[0016] The embodiments of the present invention will now be described in further detail with reference to the accompanying drawings.

[0017] like Figure 1 As shown, a device for reducing the content of needle-like and flaky aggregates in finished products includes a base 2, a processing box 1, and a screening box 4 connected sequentially from bottom to top. The processing box 1 is supported and fixed to the base 2 by support legs 3, and a shaping crusher 13 is located at the center of the base 2. Both the processing box 1 and the screening box 4 adopt a front-opening door structure, allowing for inspection and maintenance by opening the box door 21 from the front.

[0018] like Figure 2 As shown, the top of the screening box 4 is provided with a feed hopper 46. The screening box 4 is filled with a first circular screen 41 and a second circular screen 42 arranged at an inclination. The aggregate screened by the first circular screen 41 enters the processing box 1 through the first feed pipe 43, and the aggregate screened by the second circular screen 42 enters the processing box 1 through the second feed pipe 44.

[0019] like Figure 2 , 3 As shown in Figure 4, the processing box 1 is provided with two symmetrically distributed screen frames 5. Each screen frame 5 has a top that is inclined towards the center and a strip screen is embedded in the top. The screen frames on the left and right sides are respectively provided with a first strip screen 6 and a second strip screen 7. The screen frame 5 is provided with a limiting plate 10 parallel to the strip screen and a cylinder structure 9 for controlling the lifting and lowering of the limiting plate 10. The bottom of the screen frame 5 is funnel-shaped and its bottom center is connected to the discharge pipe 15. The discharge pipe 15 penetrates the side wall of the processing box 1. The bottom of the screen frame 5 near the center of the processing box 1 is provided with a discharge channel 17 with a sealing structure. The discharge channel 17 is used to discharge the needle-shaped aggregate that enters the screen frame 5. The lower side of the limiting plate 10 near the sealing structure is provided with a blocking strip 20. The blocking strip 20 is located between the sealing structure and the cylinder structure 9. The blocking strip 20 is used to block the needle-shaped aggregate to prevent it from rolling into the discharge pipe 15.

[0020] The bottom center of the processing box 1 is provided with an integral structure consisting of a collection frame 141, a collection hopper 11, and a discharge pipe 12 connected from top to bottom. The collection frame 141 is used to collect the aggregate discharged from the discharge channel 17, and the discharge pipe 12 passes through the bottom plate of the processing box 1 and faces the shaping crusher 13.

[0021] A fixed vibrating motor is connected to the bottom surface of the first circular screen 41 or the second circular screen 42; a fixed vibrating motor is also connected to the bottom surface of the first strip screen 6 or the second strip screen 7. Specifically, the first circular screen 41 is located on the upper side and is inclined from left to right. One end of the first feed pipe 43 passes through the left side wall of the screening box 4 and connects to the left side of the first circular screen 41, while the other end passes through the top wall of the processing box 1. The second circular screen 42 is located on the lower side and is inclined from left to right. One end of the second feed pipe 44 passes through the right side wall of the screening box 4 and connects to the right side of the second circular screen 42, while the other end passes through the top wall of the processing box 1. Both the first feed pipe 43 and the second feed pipe 44 are equipped with valves 45 to control the falling of aggregates.

[0022] The sieve frame 5 is provided with a connecting plate 8, which is connected to the front and rear sides of the sieve frame 5 respectively. The connecting plate 8 is connected to the limiting plate 10 through the cylinder structure 9.

[0023] The sealing structure includes a connecting rod 18 and a blocking block 19. One end of the connecting rod 18 is connected to the lower side of the limiting plate 10, and the other end is connected to the blocking block 19. The blocking block 19 is inserted into the discharge opening 16 at the top of the discharge channel 17.

[0024] like Figure 5 As shown, the collection frame 141 is equipped with a sampling structure 14, which is used to sample the sieved aggregate to facilitate the assessment of the sieving status of needle-shaped aggregate. The sampling structure 14 includes two paired baffles 142. The two baffles 142, when joined together, can block the aggregate from flowing downwards. A pull plate 144 is provided at the outward end of each baffle 142, and a limiting block 143 is provided at the inward end. Specifically, the opposing surfaces of the two baffles 142 are fixedly connected to the limiting blocks 143, and the disengaged surfaces are fixedly connected to the pull plates 144. The limiting blocks 143 are magnetically attracted to each other. Preferably, to prevent the baffles 142 from not fitting tightly within the collection frame 141, the limiting blocks 143 and the pull plates 144 are both made of magnets, and the collection frame 141 is made of iron.

[0025] The working principle of this invention is as follows: First, the aggregate to be processed is poured into the screening box 4 through the feed hopper 46. The first circular screen 41 and the second circular screen 42 are vibrated by a vibrating motor to screen the aggregate. Since the screen aperture size of the first circular screen 41 is larger than that of the second circular screen 42, large aggregates remain on the first circular screen 41, small aggregates remain on the second circular screen 42, and excessively small aggregates fall to the bottom of the screening box 4. The large aggregates on the first circular screen 41 roll to the left and enter the processing box 1 through the first feed pipe 43, while the small aggregates on the second circular screen 42 roll to the right and... The aggregate enters the processing box 1 through the second feed pipe 44. Large aggregates fall onto the first strip screen 6, and small aggregates fall onto the second strip screen 7. A vibrating motor vibrates the first and second strip screens 6 and 7, further separating the aggregates. Aggregates of suitable shape and size pass through the screen holes of the first or second strip screen 6 and enter the screen frame 5. Inside the screen frame 5, the aggregates roll towards the discharge pipe 15 at the funnel-shaped bottom, and are discharged through the discharge pipe 15. Meanwhile, needle-shaped aggregates inserted into the screen holes of the first or second strip screen 6 fall... The end abuts against the top surface of the limiting plate 10, preventing the needle-shaped aggregate from moving down the inclined surface into the screen frame 5. This avoids the needle-shaped aggregate from entering the discharge pipe 15 along with the aggregate of the correct size, thereby improving the screening effect of the needle-shaped aggregate. When too many needle-shaped aggregates are inserted into the screen holes of the first strip screen 6 or the second strip screen 7, seriously affecting the screening efficiency, the control cylinder structure 9 lowers the limiting plate 10. The lowering of the limiting plate 10 causes the needle-shaped aggregates inserted into the screen holes of the first strip screen 6 or the second strip screen 7 to pass through the screen holes and enter the screen frame 5, and then abut against the top surface of the limiting plate 10. The inclined top surface of 0 moves towards the center of the processing box 1. The needle-shaped aggregate falls on the bottom of the screen frame 5 near the center of the processing box 1 and moves towards the discharge pipe 15. However, the blocking strip 20 will block the further movement of the needle-shaped aggregate. As the limit plate 10 descends, it drives the connecting rod 18 to descend. The block 19 fixedly connected to the lower end of the connecting rod 18 enters the discharge channel 17 after passing through the discharge opening 16, thereby opening the discharge opening 16. The needle-shaped aggregate that is restricted from further movement will roll into the discharge opening 16 and be discharged downward through the discharge channel 17, and finally fall into the collection box 141.

[0026] Furthermore, when the device is first started, push the two baffles 142 in the collection frame 141 to move them toward each other until the two limiting blocks 143 are attracted together. At this time, the aggregate falling into the collection frame 141 will remain on the baffles 142. The operator can take samples of the aggregate on the baffles 142 to observe and judge the screening of needle-shaped aggregates by the device. When it is confirmed that the device is screening normally, pull the two pull plates 144 to move the two baffles 142 apart until the two limiting blocks 143 are respectively attached to the side wall of the collection frame 141. At this time, the needle-shaped aggregate falling into the collection frame 141 will continue to fall into the collection hopper 11 and then be discharged into the shaping crusher 13 through the discharge pipe 12.

[0027] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several improvements and modifications without departing from the concept of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A device for reducing the content of needle-shaped and flaky aggregates in finished products, characterized in that: It includes a base, a processing box and a screening box connected in sequence from bottom to top. The processing box is supported and fixed to the base by support legs. A shaping crusher is located at the center of the base. The top of the screening box is equipped with a feeding hopper. The screening box is filled with a first circular screen structure and a second circular screen structure arranged at an inclination. The aggregate screened by the first circular screen structure enters the processing box through the first feeding pipe, and the aggregate screened by the second circular screen structure enters the processing box through the second feeding pipe. The processing box is equipped with two symmetrically distributed screen frames. Each screen frame has a top that is inclined towards the center and a strip screen structure is embedded in the top. The screen frame is equipped with a limiting plate parallel to the strip screen structure and a cylinder structure that controls the lifting and lowering of the limiting plate. The bottom of the screen frame is funnel-shaped and its bottom center is connected to the discharge pipe. The bottom of the screen frame near the center of the processing box is equipped with a discharge channel with a sealing structure. The lower side of the limiting plate is equipped with a shielding strip near the sealing structure. The shielding strip is located between the sealing structure and the cylinder structure. The bottom center of the processing box is provided with an integral structure consisting of a collection frame, a collection hopper, and a discharge pipe connected sequentially from top to bottom. The collection frame is used to collect the aggregate discharged from the discharge channel, and the discharge pipe passes through the bottom plate of the processing box and faces the shaping crusher.

2. The device for reducing the content of needle-shaped and flake-shaped aggregates in finished products according to claim 1, characterized in that: The first or second circular screen structure includes a circular screen and a vibrating motor fixedly connected to its bottom surface; the strip screen structure includes a strip screen and a vibrating motor fixedly connected to its bottom surface.

3. The device for reducing the content of needle-shaped and flake-shaped aggregates in finished products according to claim 1, characterized in that: The sealing structure includes a connecting rod and a blocking block. One end of the connecting rod is connected to the lower side of the limiting plate, and the other end is connected to the blocking block. The blocking block is inserted into the discharge opening at the top of the discharge channel.

4. The device for reducing the content of needle-shaped and flaky aggregates in finished products according to claim 1, characterized in that: The collection frame is equipped with a sampling structure, which includes two baffles arranged in pairs. The two baffles can block the aggregate from flowing down when they are put together. The baffles have a pull plate at the outward end and a limiting block at the inward end. The limiting blocks are magnetically attracted to each other.

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