Screening device for concrete aggregate

Abstract

The utility model relates to the technical field of concrete screens, and discloses a concrete aggregate screening device which comprises a supporting frame, a screen connected to the supporting frame, a cleaning mechanism used for cleaning the screen and a driving unit used for driving the cleaning mechanism to move in the length direction of the screen, and the driving unit is connected to the supporting frame. The cleaning mechanism comprises an upper cleaning unit and a lower cleaning unit, the upper cleaning unit is located above the screen, the lower cleaning unit is located below the screen, the lower cleaning unit is used for jacking materials clamped in the screen to the position above the screen, the upper cleaning unit is used for cleaning the materials on the screen out of the screen, and the lower cleaning unit is used for cleaning the materials on the screen out of the screen. According to the utility model, aggregate clamped on the screen mesh can be cleaned from the upper part of the screen mesh through the upper cleaning unit and the lower cleaning unit, so that the service life of the screen mesh is prolonged, and the screen mesh can be better protected.

Description

Technical Field

[0001] The utility model relates to the technical field of concrete screens, in particular to a screening device for concrete aggregates. Background Art

[0002] The raw materials of concrete generally need to be screened before production. Screening is generally to remove impurities in the raw materials (generally refers to large impurities, soil, plant roots and other non-stone components). By separating raw materials of different particle sizes, it can help the density and workability of concrete, thereby improving the strength and impermeability of concrete. The raw materials after screening are easier to mix evenly, thereby improving the overall performance of concrete, allowing the various components to be more fully combined together, and by removing impurities and unqualified raw materials, it can reduce material waste in the concrete production process and reduce production costs. However, since the particles contained in the raw materials will occasionally get stuck on the screen, long-term sticking on the screen will cause the screen to deform, thereby reducing the screening quality of the screen and affecting the service life of the screen, so the raw materials stuck on the screen need to be cleaned.

[0003] In the prior art, the utility model patent (CN213825874U) discloses a discharge device for an aggregate silo of a concrete mixing station, comprising a discharge box connected below the aggregate silo, wherein a screen is arranged in the discharge box, and a discharge hopper is connected to the discharge box below the screen, and a cleaning mechanism for cleaning large particles of impurities on the screen is provided in the discharge box, wherein the cleaning mechanism comprises a roller connected below the screen and parallel to the screen, the outer wall of the roller is fixed with cleaning teeth that can be inserted into the mesh of the screen, the upper surface of the screen is provided with a scraper parallel to the roller, and a driving mechanism for driving the roller to rotate and driving the scraper and the roller to move perpendicular to the roller axis is provided in the discharge box, and a switch plate that can be opened to transfer material out of the discharge box is provided on the side wall of the discharge box, and the cleaning teeth of the device will continuously abut against the screen, which will wear the screen over time.

[0004] Based on this, the technical problem to be solved in this case is: how to clean the sand and gravel stuck in the screen from above the screen. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a screening device for concrete aggregates. The device pushes the sand and gravel stuck on the screen onto the top of the screen through the lower cleaning unit, and cleans the sand and gravel from the screen through the upper cleaning unit. In this way, the service life of the screen can be extended, thereby better protecting the screen, and the staff does not need to manually clean the screen, reducing the workload of the staff.

[0006] The technical solution of the utility model is:

[0007] A screening device for concrete aggregates, comprising a support frame, a screen connected to the support frame, a cleaning mechanism for cleaning the screen, and a driving unit for driving the cleaning mechanism to move along the length direction of the screen, wherein the driving unit is connected to the support frame, and the cleaning mechanism comprises an upper cleaning unit and a lower cleaning unit, wherein the upper cleaning unit is located above the screen, and the lower cleaning unit is located below the screen, the lower cleaning unit is used to push material stuck in the screen to the top of the screen, and the upper cleaning unit is used to clean the material on the screen out of the screen.

[0008] One of the above technical solutions of the utility model has at least one of the following advantages or beneficial effects:

[0009] The utility model uses the lower cleaning unit to push the sand and gravel stuck on the screen onto the upper part of the screen, and uses the upper cleaning unit to clean the sand and gravel from the screen, in this way the service life of the screen can be extended, thereby better protecting the screen, and the staff does not need to clean the screen manually, which reduces the workload of the staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a perspective view of Example 1 of the present utility model;

[0011] Figure 2 This is a front view of Example 1 of the utility model;

[0012] Figure 3 for Figure 2 AA section view;

[0013] Figure 4 This is a side view of Example 1 of the present utility model;

[0014] Figure 5 for Figure 4 BB cross-sectional view;

[0015] Figure 6 Schematic diagram of the structure of the lower cleaning unit.

[0016] Among them, the figure marks of each drawing are as follows: 1. support frame; 2. screen; 3. cleaning mechanism; 4. drive unit; 11. slide rail; 12. discharge port; 31. upper cleaning unit; 32. lower cleaning unit; 41. connecting rod; 121. baffle; 311. brush; 312. bracket; 313. second spring; 321. push plate; 322. connecting block; 323. first spring; 3211. inclined surface; 3212. protrusion. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0018] Example 1

[0019] See also Figure 1-6 A screening device for concrete aggregate includes a support frame 1, a screen 2 connected to the support frame 1, a cleaning mechanism 3 for cleaning the screen 2, and a driving unit 4 for driving the cleaning mechanism 3 to move along the length direction of the screen 2. The driving unit 4 is connected to the support frame 1. The cleaning mechanism 3 includes an upper cleaning unit 31 and a lower cleaning unit 32. The upper cleaning unit 31 is located above the screen 2, and the lower cleaning unit 32 is located below the screen 2. The lower cleaning unit 32 is used to push the material stuck in the screen 2 to the top of the screen 2, and the upper cleaning unit 31 is used to clean the material on the screen 2 out of the screen 2.

[0020] In practical applications, after the aggregate of concrete is screened through the screen 2, irregular sand and gravel with a particle size close to the diameter of the screening mesh of the screen 2 in the aggregate will be stuck on the screen 2, which requires cleaning the sand and gravel stuck on the screen 2. If the screen 2 is only cleaned by the brush 311, some sand and gravel will be stuck on the screen holes of the screen 2 and block the screen holes, making it impossible for qualified aggregate to fall through the blocked screen holes, thereby reducing the screening efficiency. On the other hand, the aggregate stuck in the screen 2 is unqualified. If Aggregates that fall from the screen 2 may be mixed in qualified aggregates, thereby affecting the quality of the concrete. Therefore, when cleaning the screen 2, the lower cleaning unit 32 can prevent the unqualified aggregates stuck in the screen 2 from falling from under the screen 2, and the unqualified aggregates stuck in the screen 2 can be pushed to the top of the screen 2, and the materials on the screen 2 can be cleaned out of the screen 2 through the upper cleaning unit 31, thereby better protecting the screen 2, extending the service life of the screen 2, and reducing the workload of the staff.

[0021] Preferably, the lower cleaning unit 32 includes a vertically arranged push plate 321 and a connecting block 322, the connecting block 322 is connected to the driving unit 4, the push plate 321 is connected to the connecting block 322, and the push plate 321 is located in front of the upper cleaning unit 31 moving along the length direction of the screen 2.

[0022] Through the above design, the push plate 321 is located in front of the upper cleaning unit 31 and can push the unqualified aggregate stuck in the screen 2 onto the screen 2 while being cleaned by the upper cleaning unit 31, and the push plate 321 can move together with the connecting block 322, thereby ensuring that the cleaning range can cover the entire screen 2.

[0023] More preferably, the push plate 321 is provided with an inclined surface 3211 slanting downward from a side close to the upper cleaning unit 31 to a side away from the upper cleaning unit 31 .

[0024] In the above design, the downward inclined surface 3211 can make the push plate 321 move the unqualified aggregate upward in a manner that fits the inclined surface 3211 when contacting the screen 2, and finally push the unqualified aggregate stuck in the screen 2 from the bottom of the screen 2 to the top of the screen 2, so that the upper cleaning unit 31 can clean the unqualified aggregate from the screen 2.

[0025] More preferably, a first spring 323 is provided at the bottom of the push plate 321 , and the push plate 321 is connected to the connecting block 322 via the first spring 323 .

[0026] In this embodiment, the first spring 323 can ensure that the highest point of the push plate 321 is always in contact with the screen 2, so that unqualified aggregate can be pushed onto the screen 2 through the inclined surface 3211.

[0027] More preferably, the push plate 321 is provided with a plurality of spherical crown-shaped protrusions 3212 , which are staggered along the inclined surface 3211 . The plurality of protrusions 3212 are used to loosen the material stuck on the screen 2 and push it above the screen 2 through the push plate 321 .

[0028] In this embodiment, multiple protrusions 3212 are located on the inclined surface 3211. When unqualified aggregate protrudes from the bottom of the screen 2, when the push plate 321 contacts the unqualified aggregate, the protrusion 3212 will make priority contact, and through multiple contacts, the unqualified aggregate can be loosened from the screen 2 in an up and down reciprocating manner so that it can be pushed to the top of the screen 2 by the push plate 321 and cleaned up by the upper cleaning unit 31.

[0029] Furthermore, the upper cleaning unit 31 includes a brush 311 and a bracket 312, the bracket 312 is provided with a second spring 313, the brush 311 is connected to the second spring 313, the bracket 312 is connected to the driving unit 4, and the lower cleaning unit 32 is located in front of the bracket 312 moving along the length direction of the screen 2, and the driving unit 4 is used to drive the bracket 312 to move along the length direction of the screen 2.

[0030] Through the above design, the driving unit 4 drives the bracket 312 and drives the brush 311 to move along the length direction of the screen 2, thereby sweeping the entire area of ​​the screen 2, and then cleaning the unqualified aggregate on the screen 2 from the screen 2. On the other hand, the second spring 313 can ensure that the brush 311 is in contact with the screen 2, thereby ensuring that the unqualified aggregate on the screen 2 is cleaned away.

[0031] Preferably, the driving unit 4 is a ball screw.

[0032] In this embodiment, the ball screw can ensure that the push plate 321 and the brush 311 move along the length direction of the screen 2, so that the cleaning range can cover the entire screen 2.

[0033] More preferably, a connecting rod 41 is provided on the slider of the ball screw, and the connecting rod 41 is connected to the lower cleaning unit 32. Slide rails 11 are provided on both sides of the support frame 1, and the slide rails 11 are arranged along the length direction of the screen 2. The lower cleaning unit 32 is slidably connected to the slide rails 11 and can move along the direction of the slide rails 11.

[0034] Through the above design, the connecting rod 41 can drive the connecting block 322 to move together, so that the push plate 321 and the brush 311 move synchronously, thereby ensuring that the push plate 321 is always located in front of the brush 311, which is conducive to pushing unqualified aggregate to the top of the screen 2 and cleaning it through the brush 311. On the other hand, the sliding rail 11 can ensure that the movement direction of the connecting block 322 is along the length direction of the screen 2, which is conducive to preventing the push plate 321 from becoming unstable due to the force generated by the contact between the push plate 321 and the unqualified aggregate.

[0035] More preferably, the screen 2 is arranged to be tilted downward, and the support frame 1 is provided with a discharge port 12, which is located at one end of the screen 2 tilted downward, and the discharge port 12 is provided with symmetrically arranged baffles 121.

[0036] In this embodiment, in order to facilitate the centralized recovery and processing of unqualified aggregates, the unqualified aggregates on the screen 2 are swept to the discharge port 12 by the brush 311, and the unqualified aggregates are recovered and processed together through the discharge port 12, while the baffle 121 can prevent the material from being discharged outward from the area outside the discharge port 12, which is conducive to the recovery and processing of unqualified aggregates.

[0037] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A screening device for concrete aggregates, comprising a support frame, a screen connected to the support frame, a cleaning mechanism for cleaning the screen, and a driving unit for driving the cleaning mechanism to move along the length direction of the screen, wherein the driving unit is connected to the support frame, and is characterized in that: The cleaning mechanism includes an upper cleaning unit and a lower cleaning unit. The upper cleaning unit is located above the screen and the lower cleaning unit is located below the screen. The lower cleaning unit is used to push the material stuck in the screen to the top of the screen, and the upper cleaning unit is used to clean the material on the screen out of the screen. The lower cleaning unit includes a vertically arranged push plate and a connecting block, wherein the connecting block is connected to the driving unit, the push plate is connected to the connecting block, and the push plate is located in front of the upper cleaning unit moving along the length direction of the screen; The upper cleaning unit includes a brush and a bracket. The bracket is provided with a second spring. The brush is connected to the second spring. The bracket is connected to a driving unit. The lower cleaning unit is located in front of the bracket moving along the length direction of the screen. The driving unit is used to drive the bracket to move along the length direction of the screen.

2. A concrete aggregate screening device according to claim 1, characterized in that: The push plate is provided with an inclined surface which is inclined downward from a side close to the upper cleaning unit to a side away from the upper cleaning unit.

3. The concrete aggregate screening device according to claim 1, characterized in that: A first spring is provided at the bottom of the push plate, and the push plate is connected to the connecting block via the first spring.

4. A concrete aggregate screening device according to claim 2, characterized in that: The push plate is provided with a plurality of spherical crown-shaped protrusions, which are staggered along the inclined surface. The plurality of protrusions are used to loosen the material stuck on the screen and push it onto the screen through the push plate.

5. The concrete aggregate screening device according to claim 1, characterized in that: The driving unit is a ball screw.

6. The concrete aggregate screening device according to claim 5, characterized in that: A connecting rod is provided on the slider of the ball screw, and the connecting rod is connected to the lower cleaning unit. Slide rails are provided on both sides of the support frame, and the slide rails are arranged along the length direction of the screen. The lower cleaning unit is slidably connected to the slide rails and can move along the slide rail direction.

7. The concrete aggregate screening device according to claim 1, characterized in that: The screen is arranged to be tilted downward, and a discharge port is provided on the support frame. The discharge port is located at one end of the screen tilted downward, and symmetrically arranged baffles are provided on the discharge port.

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