A screening device for concrete raw materials

Abstract

This utility model discloses a screening device for concrete raw materials, comprising: an inclined guide frame, a screening groove at the top of the inclined guide frame, a feeding hopper fixed to the higher side of the top of the inclined guide frame, an inclined discharge channel at the bottom of the feeding hopper, a fixing cover fixed to the side of the bottom of the feeding hopper near the inclined discharge channel, and an outlet adjustment mechanism on the outside of the fixing cover. This utility model utilizes the wavy, elongated structure of the screening frame to create undulating surfaces on the screening mesh, increasing the contact and residence time between the concrete raw materials and the mesh. The unevenness of the mesh promotes the positional shift of the raw materials, allowing smaller particles to be better screened and fall. Adjusting the outlet adjustment mechanism reduces the thickness of the discharge port, decreasing the amount of material fed and achieving fine screening. Combined with movable crushing components, it crushes agglomerated raw materials and prevents outlet blockage.

Description

Technical Field

[0001] This utility model relates to the field of concrete production technology, and in particular to a screening device for concrete raw materials. Background Technology

[0002] The main raw materials for concrete include cement, crushed stone, sand, fly ash, expansion agent, and antifreeze agent. Before use, these raw materials need to be screened to prevent the presence of some large particles from affecting the subsequent performance of the concrete.

[0003] Chinese Patent Publication No. CN221183629U discloses a screening device for concrete raw materials, including a rectangular frame. There are at least three rectangular frames, which are parallel to each other and placed at an angle. The length of the rectangular frames decreases from top to bottom. Sufficient space is left at the bottom of the screen plate of each rectangular frame to allow for the direct placement of a transfer vehicle for collecting the screened material.

[0004] The aforementioned existing technical solution has the following shortcomings: The device uses an inclined screen plate in conjunction with a vibrating motor to screen concrete raw materials. However, in this structure, when the concrete raw materials fall from the height of the screen plate, the time the concrete raw materials spend on the screen plate is short due to vibration and acceleration. This can easily cause some concrete raw materials to roll directly to the bottom with the bottom layer of raw materials without being completely screened, resulting in fine particles being mixed into the coarse product. Therefore, there is room for improvement. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the defect in the prior art that the contact between concrete raw materials and the screen plate is not sufficient, which easily causes fine particles of raw materials to be mixed in the coarse product after screening. This utility model proposes a screening device for concrete raw materials.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a screening device for concrete raw materials, comprising: an inclined guide frame, a screening trough at the top of the inclined guide frame, a feeding hopper fixed to the higher side of the top of the inclined guide frame, an inclined discharge channel at the bottom of the feeding hopper, a fixing cover fixed to the side of the bottom of the feeding hopper near the inclined discharge channel, an outlet adjustment mechanism on the outside of the fixing cover, and a screening mechanism located above the screening trough, below the inclined discharge channel, and the interior of the screening trough is far from the lower... One end of the hopper is fixed with an L-shaped guide chute, which is located below the screening mechanism. The screening mechanism includes a screening frame installed inside the screening trough. The end of the screening frame near the inclined discharge channel is rotatably connected to the inside of the screening trough. Multiple springs are fixed at the bottom of the other end of the screening frame, and the bottom ends of the springs are all connected to the inner wall of the L-shaped guide chute. A vibration motor is installed on one side of the bottom end of the screening frame, and a screening screen is fixed at the top of the screening frame. The screening frame has a wavy strip structure in the length direction, and the entire screening frame is set at an inclination.

[0007] Preferably, the outlet adjustment mechanism includes a baffle that is slidably installed on the outer wall of the fixed cover, a screw fixed at the bottom of both sides of the hopper, a rotating plate sleeved on the outside of the screw, one end of the rotating plate being fixedly connected to the outside of the baffle, and a locking nut sleeved on the outer end of the screw, with the inner wall of the locking nut abutting against the outer side of the rotating plate.

[0008] Preferably, the outer side of the fixed cover is curved, the main view section of the baffle is curved, and the outlet adjustment mechanism is located at the outer end of the inclined discharge channel.

[0009] Preferably, a movable crushing component is provided on the side of the screening tank away from the L-shaped guide chute, and one end of the movable crushing component extends into the interior of the inclined discharge channel.

[0010] Preferably, the movable crushing assembly includes a rotating motor fixed to one side of the inclined guide frame. One end of the rotating motor is connected to a lead screw, one end of which extends into the interior of the screening trough. A connecting sleeve is threaded onto the outer side of the lead screw, and a fixing sleeve is fixed to the top of the connecting sleeve. A crushing rod extends through the interior of the fixing sleeve, and the crushing rod and the fixing sleeve are rotatably connected. One end of the crushing rod extends into the interior of the inclined discharge channel, and multiple crushing blades are installed at one end of the crushing rod located inside the inclined discharge channel. The crushing blades are located behind the baffle.

[0011] Preferably, a gear is fixed at the end of the crushing rod away from the crushing blade, a toothed plate meshes with one side of the gear, and both ends of the toothed plate are fixedly connected to the inner sidewall of the screening trough, with the toothed plate and the lead screw being distributed in parallel.

[0012] Compared with the prior art, the beneficial effects of this utility model include:

[0013] The wavy strip structure along the length of the screening frame creates a wave-like undulation on the screen surface, increasing the contact and residence time of the concrete raw materials during the rolling process. The raised and recessed positions on the screen further amplify the impact and bounce of the concrete raw materials, facilitating the transfer of positions between the upper and lower layers. This improves the downward screening and falling of small particles in the concrete raw materials. Adjusting the outlet regulating mechanism changes the opening thickness of the inclined discharge channel, reducing the amount of concrete raw materials fed in, achieving fine screening. Simultaneously, in conjunction with the movable crushing components, toothed plates, gears, etc., it crushes any agglomerates of concrete raw materials in the inclined discharge channel, preventing blockage of the outlet. Attached Figure Description

[0014] The disclosure of this utility model is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings, the same reference numerals are used to refer to the same parts. Wherein:

[0015] Figure 1 The schematic diagram shows a three-dimensional structural schematic diagram according to one embodiment of the present utility model;

[0016] Figure 2 The schematic diagram shows a cross-sectional perspective structural schematic diagram according to one embodiment of the present utility model;

[0017] Figure 3 The schematic diagram shows a three-dimensional structural schematic of an active crushing assembly according to one embodiment of the present utility model;

[0018] Figure 4 The schematic diagram shows a three-dimensional structural schematic of an outlet regulating mechanism according to one embodiment of the present utility model;

[0019] Figure 5 The schematic diagram shows a three-dimensional structural schematic of a screening mechanism according to one embodiment of the present invention.

[0020] The following are the labels in the diagram: 1. Inclined guide frame; 2. Feed hopper; 3. Inclined discharge channel; 4. Fixed cover; 5. Outlet adjustment mechanism; 51. Baffle; 52. Rotating plate; 53. Screw; 54. Locking nut; 6. Screening mechanism; 61. Screening frame; 62. Screening screen; 63. Vibrating motor; 64. Spring; 7. L-shaped guide trough; 8. Screening trough; 9. Movable crushing assembly; 91. Rotating motor; 92. Lead screw; 93. Connecting sleeve; 94. Fixed sleeve; 95. Crushing rod; 96. Crushing blade; 10. Toothed plate; 11. Gear. Detailed Implementation

[0021] It is readily understood that, based on the technical solution of this utility model, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of this utility model. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this utility model and should not be considered as the entirety of this utility model or as limitations or restrictions on the technical solution of this utility model.

[0022] Example 2

[0023] To address the shortcomings of existing technologies, such as insufficient contact between concrete raw materials and the sieve plate, which easily leads to the inclusion of fine particles in the coarse product after sieving, the following solution is disclosed, specifically as follows: Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown:

[0024] A screening device for concrete raw materials includes: an inclined guide frame 1, a screening trough 8 at the top of the inclined guide frame 1, a feeding hopper 2 fixed to the higher side of the top of the inclined guide frame 1, an inclined discharge channel 3 at the bottom of the feeding hopper 2, a fixing cover 4 fixed to the side of the bottom of the feeding hopper 2 near the inclined discharge channel 3, an outlet adjustment mechanism 5 on the outside of the fixing cover 4, a screening mechanism 6 located above the inside of the screening trough 8, the screening mechanism 6 being located below the inclined discharge channel 3, and an L-shaped guide trough 7 fixed to the end of the inside of the screening trough 8 away from the feeding hopper 2. The material trough 7 is located below the screening mechanism 6. The screening mechanism 6 includes a screening frame 61 installed inside the screening trough 8. The end of the screening frame 61 near the inclined discharge channel 3 is rotatably connected to the inside of the screening trough 8. Multiple springs 64 are fixed at the bottom of the other end of the screening frame 61. The bottom ends of the springs 64 are all connected to the inner wall of the L-shaped guide trough 7. A vibration motor 63 is installed on one side of the bottom end of the screening frame 61. A screening screen 62 is fixed at the top of the screening frame 61. The screening frame 61 has a wavy strip structure in the length direction. The screening frame 61 is inclined as a whole.

[0025] The outlet adjustment mechanism 5 includes a baffle 51 that is slidably installed on the outer wall of the fixed cover 4. Screws 53 are fixed at the bottom ends on both sides of the hopper 2. Rotating plates 52 are sleeved on the outside of the screws 53. One end of the rotating plates 52 is fixedly connected to the outside of the baffle 51. Locking nuts 54 are sleeved on the outer end of the screws 53. The inner wall of the locking nuts 54 abuts against the outer side of the rotating plates 52.

[0026] The outer side of the fixed cover 4 is curved, the main view section of the baffle 51 is curved, and the outlet adjustment mechanism 5 is located at the outer end of the inclined discharge channel 3.

[0027] In this embodiment, concrete raw materials are pre-placed in the hopper 2. The materials are automatically transferred to the screening frame 61 under gravity through the inclined discharge channel 3. By pushing the baffle 51, the rotating plate 52 rotates along the screw 53. The rotating plate 52 is fixed by the inward screwing of the locking nut 54, thereby adjusting the size of the opening between the bottom of the baffle 51 and the inclined discharge channel 3 to adjust the amount of concrete raw materials falling onto the screening frame 61, avoiding excessive material discharge at once, and achieving a fine screening effect. When the concrete raw materials roll on the screening frame 61, the vibration motor 63 is started, and in conjunction with the spring 64, the screening screen 62 is vibrated, so that the concrete raw materials are continuously shaken on the screening screen 62 to promote the impact between the concrete raw materials and the screening screen 62. Due to the wavy undulation of the screening screen 62, the residence time of the raw materials on the screening screen 62 is increased, thereby promoting the full screening of the raw materials. The coarse raw materials are discharged to one side through the L-shaped guide chute 7, while the fine raw materials are discharged from the bottom of the screening trough 8.

[0028] Example 2

[0029] To further improve the smooth screening of concrete raw materials and prevent the problem of some raw materials caking and clogging the outlet, the following solution is disclosed, as follows: Figure 2 and Figure 3 As shown:

[0030] A movable crushing component 9 is provided on the side of the screening tank 8 away from the L-shaped guide trough 7, and one end of the movable crushing component 9 extends into the interior of the inclined discharge channel 3.

[0031] The active crushing assembly 9 includes a rotating motor 91 fixed to one side of the inclined guide frame 1. One end of the rotating motor 91 is connected to a lead screw 92. One end of the lead screw 92 passes through the interior of the screening trough 8. A connecting sleeve 93 is threaded onto the outside of the lead screw 92. A fixing sleeve 94 is fixed to the top of the connecting sleeve 93. A crushing rod 95 passes through the interior of the fixing sleeve 94. The crushing rod 95 and the fixing sleeve 94 are rotatably connected. One end of the crushing rod 95 passes through the interior of the inclined discharge channel 3. Multiple crushing blades 96 are installed on one end of the crushing rod 95 located inside the inclined discharge channel 3. The crushing blades 96 are located behind the baffle 51.

[0032] A gear 11 is fixed at one end of the crushing rod 95 away from the crushing blade 96. A toothed plate 10 meshes with one side of the gear 11. Both ends of the toothed plate 10 are fixedly connected to the inner sidewall of the screening trough 8. The toothed plate 10 and the lead screw 92 are distributed in parallel.

[0033] In this embodiment, during the discharge process of the inclined discharge channel 3, the rotating motor 91 is started synchronously to rotate in both directions, causing the lead screw 92 to rotate, thereby causing the connecting sleeve 93 to move axially along the lead screw 92, so that one end of the connecting sleeve 93 moves along the outlet of the inclined discharge channel 3. Since the gear 11 is always meshed with the toothed plate 10 during this process, the gear 11 drives the crushing rod 95 to rotate, causing the crushing blade 96 to rotate, so as to cut the passing concrete raw materials, so as to prevent the clumps of raw materials from being blocked at the outlet position, and to achieve the crushing effect of the clumps.

[0034] The scope of this utility model is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the protection scope of this utility model.

Claims

1. A screening device for concrete raw materials, characterized in that, include: An inclined guide frame has a screening trough at its top. A hopper is fixed to the higher side of the top of the inclined guide frame, and an inclined discharge channel is provided at the bottom of the hopper. A fixing cover is fixed to the bottom of the hopper near the inclined discharge channel, and an outlet adjustment mechanism is provided on the outside of the fixing cover. A screening mechanism is provided at the upper part of the screening trough, below the inclined discharge channel. An L-shaped guide trough is fixed to the end of the screening trough away from the hopper. Located below the screening mechanism, the screening mechanism includes a screening frame installed inside the screening trough. One end of the screening frame near the inclined discharge channel is rotatably connected to the inside of the screening trough. Multiple springs are fixed to the bottom of the other end of the screening frame, and the bottom ends of the springs are all connected to the inner wall of the L-shaped guide trough. A vibration motor is installed on one side of the bottom end of the screening frame, and a screening screen is fixed to the top of the screening frame. The screening frame has a wavy strip structure in the length direction, and the entire screening frame is inclined.

2. The screening device for concrete raw materials according to claim 1, characterized in that: The outlet adjustment mechanism includes a baffle that is slidably installed on the outer wall of the fixed cover. Screws are fixed at the bottom ends of both sides of the hopper. Rotating plates are sleeved on the outside of the screws. One end of each rotating plate is fixedly connected to the outside of the baffle. A locking nut is sleeved on the outer end of the screw. The inner wall of the locking nut abuts against the outer side of the rotating plate.

3. The screening device for concrete raw materials according to claim 2, characterized in that: The outer side of the fixed cover is curved, the main view section of the baffle is curved, and the outlet adjustment mechanism is located at the outer end of the inclined discharge channel.

4. The screening device for concrete raw materials according to claim 2, characterized in that: A movable crushing component is provided on the side of the screening tank away from the L-shaped guide trough, and one end of the movable crushing component extends into the interior of the inclined discharge channel.

5. The screening device for concrete raw materials according to claim 4, characterized in that: The movable crushing assembly includes a rotating motor fixed to one side of the inclined guide frame. One end of the rotating motor is connected to a lead screw, and one end of the lead screw extends into the interior of the screening trough. A connecting sleeve is threaded onto the outside of the lead screw, and a fixing sleeve is fixed to the top of the connecting sleeve. A crushing rod extends through the interior of the fixing sleeve, and the crushing rod and the fixing sleeve are rotatably connected. One end of the crushing rod extends into the interior of the inclined discharge channel, and multiple crushing blades are installed at one end of the crushing rod located inside the inclined discharge channel. The crushing blades are located behind the baffle.

6. The screening device for concrete raw materials according to claim 5, characterized in that: A gear is fixed to one end of the crushing rod away from the crushing blade. A toothed plate meshes with one side of the gear. Both ends of the toothed plate are fixedly connected to the inner sidewall of the screening trough. The toothed plate and the lead screw are distributed in parallel.

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