Nano calcium carbonate raw material screening device

Abstract

The utility model discloses a nano calcium carbonate raw material screening device which comprises a screening box (1), the screening box (1) is connected with a dust collecting box (3) through an air inlet pipe (2), an exhaust fan (4) is arranged on the air inlet pipe (2), an air outlet (5) is formed in the dust collecting box (3), filter cloth (6) is arranged in the dust collecting box (3), a pressing mechanism is arranged on the bottom face of the filter cloth (6), and a winding mechanism is arranged on the filter cloth (6). The winding mechanism pulls the filter cloth (6) to move along the air outlet (5); the pressing mechanism comprises a pressing frame (7) located at the bottom of the filter cloth (6), supporting strips (8) are arranged on the two sides of the pressing frame (7), connecting rods (9) connected with the dust collecting box (3) are arranged on the supporting strips (8), and springs (10) are arranged between the pressing frame (7) and the supporting strips (8). The utility model has the advantage of convenient use.

Description

Technical Field

[0001] The utility model belongs to the field of nano calcium carbonate production equipment, in particular to a nano calcium carbonate raw material screening device. Background Art

[0002] The raw material for producing nano calcium carbonate is limestone from mines. After the limestone is crushed, it is necessary to screen out particles of suitable size, then calcine it into quicklime, digest the quicklime into calcium hydroxide slurry, and dehydrate and dry the calcium hydroxide slurry before the finished product can be obtained.

[0003] Existing screening devices, such as a limestone screening device for calcium hydroxide production with application number 202321882396.8, screen the limestone in a relatively closed screening box, and use a continuously vibrating, inclined screening plate in the screening box to screen the limestone. The size of the sieve holes on the screening plate determines the screening size of the limestone. The dust generated during the screening process is driven by an exhaust fan into a dust collecting box outside the screening box, which can avoid dust pollution of the environment and protect workers.

[0004] The existing screening device has the following defects: the exhaust fan sends the dust into the dust box, and the dust needs to stay in the dust box, and the air entering the dust box needs to be discharged in time to avoid the formation of high pressure inside the dust box. This requires opening a large-diameter exhaust hole in the dust box, and covering the exhaust hole with a filter cloth that allows air to pass through but prevents dust from passing through. However, the dust moves with the airflow and is easily accumulated on the filter cloth, causing the filter cloth to be blocked. The filter cloth needs to be frequently replaced or cleaned, which is cumbersome to use.

[0005] Therefore, the existing screening device has the defect of being complicated to use. Utility Model Content

[0006] The purpose of the utility model is to provide a nano calcium carbonate raw material screening device. The utility model has the advantage of being convenient to use.

[0007] The technical solution of the utility model is as follows: a nano calcium carbonate raw material screening device comprises a screening box, the screening box is connected to a dust collecting box through an air inlet pipe, the air inlet pipe is provided with an exhaust fan, the dust collecting box is provided with an exhaust port, a filter cloth covering the exhaust port is provided inside the dust collecting box, the filter cloth is a belt-shaped structure, a pressing mechanism is provided on the bottom surface of the filter cloth, the pressing mechanism makes the filter cloth elastically pressed against the inner wall of the dust collecting box, a winding mechanism is provided on the filter cloth, and the winding mechanism pulls the filter cloth to move along the exhaust port.

[0008] In the aforementioned nano-calcium carbonate raw material screening device, the clamping mechanism includes a pressing frame located at the bottom of the filter cloth, the exhaust port is located on the inner side of the pressing frame, and support bars are provided on both sides of the pressing frame. The support bars are located below the pressing frame, and at least two connecting rods connected to the dust box are provided on the support bars. The connecting rods pass through the pressing frame, and at least two springs are provided between the pressing frame and the support bars.

[0009] In the aforementioned nano-calcium carbonate raw material screening device, the spring is in a spiral shape and is sleeved on the connecting rod.

[0010] In the aforementioned nano-calcium carbonate raw material screening device, the winding mechanism includes a first follower roller and a second follower roller respectively located on both sides of the pressure frame, a first drive roller is provided on the lower side of the first follower roller, and a second drive roller is provided on the lower side of the second follower roller. One end of the filter cloth is wound around the first drive roller after passing by the first follower roller, and the other end of the filter cloth is wound around the second drive roller after passing by the second follower roller. The first drive roller and the second drive roller are both connected to the driving mechanism.

[0011] In the aforementioned nano-calcium carbonate raw material screening device, the driving mechanism includes a motor and a chain both located outside the dust collecting box, three sprockets are provided on the inner side of the chain, one of the sprockets is fixed to the output end of the motor, and the other two sprockets are respectively connected to the first driving roller and the second driving roller.

[0012] In the aforementioned nano-calcium carbonate raw material screening device, brush plates are provided between the first driving roller and the first follower roller and between the second driving roller and the second follower roller. The brush plates are fixed to the dust collecting box and are in contact with the filter cloth.

[0013] In the aforementioned nano-calcium carbonate raw material screening device, a collecting bucket is provided in the dust collecting box, the outer edge of the collecting bucket is fixed to the dust collecting box, and the collecting bucket is located at the lower side of the air inlet pipe.

[0014] Compared with the prior art, the utility model has made an improvement on the structure of the dust box on the basis of the existing screening device, by arranging a strip of filter cloth on the exhaust port of the dust box, using a pressing mechanism to press a part of the filter cloth to the dust box to close the exhaust port, and using a winding mechanism to pull the filter cloth to move, so that the clean area of ​​the filter cloth slowly passes through the exhaust port, ensuring that the airflow can smoothly pass through the filter cloth and be discharged from the exhaust port, thereby reducing the chance of filter cloth clogging, reducing the frequency of replacement or cleaning, and being more convenient to use.

[0015] In addition, the utility model cleans the dust attached to the filter cloth by means of the brush plate, so that the filter cloth is restored to be clean, thereby further extending the service life of the filter cloth, further reducing the frequency of replacing or cleaning the filter cloth, and being more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a front view structural schematic diagram of the utility model.

[0017] Figure 2 It is a left-side structural schematic diagram of the first follower roller.

[0018] Figure 3 It is a left-side structural schematic diagram of the first driving roller.

[0019] Figure 4 It is a structural diagram of the driving mechanism.

[0020] Figure 5 It is a structural diagram of the clamping mechanism.

[0021] The markings in the accompanying drawings are: 1-screening box, 2-air inlet pipe, 3-dust collecting box, 4-exhaust fan, 5-exhaust port, 6-filter cloth, 7-pressure frame, 8-support bar, 9-connecting rod, 10-spring, 11-first follower roller, 12-second follower roller, 13-first driving roller, 14-second driving roller, 15-motor, 16-chain, 17-sprocket, 18-brush plate, 19-collecting bucket, 20-first bracket, 21-second bracket. DETAILED DESCRIPTION

[0022] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0023] Embodiment 1. A nano calcium carbonate raw material screening device, such as Figure 1 As shown, it includes a screening box 1, which is connected to a dust collecting box 3 through an air inlet pipe 2, and an exhaust fan 4 is provided on the air inlet pipe 2. The characteristics are as follows:

[0024] An exhaust port 5 is provided on the dust box 3, and a filter cloth 6 covering the exhaust port 5 is provided inside the dust box 3. The filter cloth 6 is a belt-shaped structure, and a clamping mechanism is provided on the bottom surface of the filter cloth 6. The clamping mechanism elastically presses the filter cloth 6 against the inner wall of the dust box 3. A winding mechanism is provided on the filter cloth 6, and the winding mechanism pulls the filter cloth 6 to move along the exhaust port 5.

[0025] The clamping mechanism includes a pressing frame 7 located at the bottom of the filter cloth 6, the exhaust port 5 is located on the inner side of the pressing frame 7, and support bars 8 are provided on both sides of the pressing frame 7. The support bars 8 are located below the pressing frame 7, and five connecting rods 9 are provided on the support bars 8, which are all connected to the dust box 3. The connecting rods 9 pass through the pressing frame 7, and five spiral springs 10 are provided between the pressing frame 7 and the support bars 8. The five springs 10 are respectively sleeved on the five connecting rods 9.

[0026] The winding mechanism includes a first follower roller 11 and a second follower roller 12 respectively located on both sides of the pressing frame 7. Both ends of the first follower roller 11 and the second follower roller 12 are rotatably connected to the dust box 3 through a first bracket 20. A first driving roller 13 is provided at the lower side of the first follower roller 11, and a second driving roller 14 is provided at the lower side of the second follower roller 12. One end of the filter cloth 6 is wound around the first driving roller 13 after passing through the first follower roller 11, and the other end of the filter cloth 6 is wound around the second driving roller 14 after passing through the second follower roller 12. The first driving roller 13 and the second driving roller 14 are both connected to the driving mechanism. The first driving roller 13 and the second driving roller 14 are both rotatably connected to the dust box 3 through a second bracket 21.

[0027] The driving mechanism includes a motor 15 and a chain 16 both located outside the dust box 3. The motor 15 is an explosion-proof reduction motor. Three sprockets 17 are provided on the inner side of the chain 16. One of the sprockets 17 is fixed to the output end of the motor 15, and the other two sprockets 17 are connected to the first driving roller 13 and the second driving roller 14 respectively.

[0028] A brush plate 18 is provided between the first driving roller 13 and the first follower roller 11 and between the second driving roller 14 and the second follower roller 12 . The brush plate 18 is fixed to the dust box 3 and contacts the filter cloth 6 .

[0029] The dust box 3 is provided with a collecting hopper 19 , the outer edge of which is fixed to the dust box 3 , and the collecting hopper 19 is located at the lower side of the air inlet pipe 2 .

[0030] Working principle: The dust in the screening box 1 enters the dust box 3 with the airflow under the action of the exhaust fan 4. After the airflow enters the dust box 3, the flow rate decreases, and most of the dust settles into the collection bucket 19 under the action of gravity and enters the bottom of the collection bucket 19. The collection bucket 19 isolates the airflow from the dust box 3 to prevent the dust in the collection bucket from being raised again. The airflow leaves the dust box 3 from the exhaust port 5 through the filter cloth 6, and part of the dust is intercepted on the filter cloth 6 with the movement of the airflow. Under the elastic force of the spring 10, the pressing frame 7 presses the filter cloth 6 on the dust box 3 to prevent the airflow and dust from passing through the exhaust port 5 around the filter cloth 6.

[0031] The motor 15 drives one of the sprockets 17 to rotate, and driven by the chain 16, the other two sprockets 17 rotate synchronously, so that the first drive roller 13 and the second drive roller 14 rotate synchronously and in the same direction, and the filter cloth 6 overcomes the pressing force of the pressing frame 7 and is pulled, and the clean area of ​​the filter cloth 6 slowly passes through the bottom of the exhaust port, so that the airflow can smoothly pass through the exhaust port 5. When the filter cloth 6 passes through the brush plate 18, the dust attached to the filter cloth 6 is brushed off by the brush plate 18, so that the filter cloth 6 is restored to a clean state.

[0032] Embodiment 2: Based on Embodiment 1, the motor 15 is connected to a PLC controller, and the PLC controller is used to make the motor 15 rotate forward and reverse periodically, and the filter cloth 6 moves back and forth periodically.

[0033] Embodiment 3. Based on embodiment 2, a filter is provided at the upper end of the air outlet 5 to further intercept the powder. Since the powder is basically intercepted by the filter cloth 6, the amount of dust entering the filter is very small, the service life of the filter is very long, and the replacement frequency is low.

[0034] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc., indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

Claims

1. A nano calcium carbonate raw material screening device, comprising a screening box (1), the screening box (1) is connected to a dust collecting box (3) through an air inlet pipe (2), and an exhaust fan (4) is provided on the air inlet pipe (2), characterized in that: An exhaust port (5) is provided on the dust collecting box (3), and a filter cloth (6) covering the exhaust port (5) is provided inside the dust collecting box (3). The filter cloth (6) is a belt-shaped structure, and a pressing mechanism is provided on the bottom surface of the filter cloth (6). The pressing mechanism causes the filter cloth (6) to be elastically pressed against the inner wall of the dust collecting box (3). A winding mechanism is provided on the filter cloth (6), and the winding mechanism pulls the filter cloth (6) to move along the exhaust port (5).

2. The nano calcium carbonate raw material screening device according to claim 1, wherein: The pressing mechanism comprises a pressing frame (7) located at the bottom of the filter cloth (6), the exhaust port (5) is located inside the pressing frame (7), support bars (8) are provided on both sides of the pressing frame (7), the support bars (8) are located below the pressing frame (7), at least two connecting rods (9) connected to the dust box (3) are provided on the support bars (8), the connecting rods (9) pass through the pressing frame (7), and at least two springs (10) are provided between the pressing frame (7) and the support bars (8).

3. The nano calcium carbonate raw material screening device according to claim 2, wherein: The spring (10) is in a spiral shape and is sleeved on the connecting rod (9).

4. The nano calcium carbonate raw material screening device according to claim 1, characterized in that: The winding mechanism comprises a first follower roller (11) and a second follower roller (12) respectively located on both sides of the pressing frame (7); a first driving roller (13) is provided on the lower side of the first follower roller (11); a second driving roller (14) is provided on the lower side of the second follower roller (12); one end of the filter cloth (6) passes around the first follower roller (11) and is then wound around the first driving roller (13); the other end of the filter cloth (6) passes around the second follower roller (12) and is then wound around the second driving roller (14); and both the first driving roller (13) and the second driving roller (14) are connected to the driving mechanism.

5. The nano calcium carbonate raw material screening device according to claim 4, characterized in that: The driving mechanism comprises a motor (15) and a chain (16) both located outside the dust box (3); three sprockets (17) are provided inside the chain (16); one of the sprockets (17) is fixed to the output end of the motor (15); and the other two sprockets (17) are respectively connected to the first driving roller (13) and the second driving roller (14).

6. The nano calcium carbonate raw material screening device according to claim 5, characterized in that: A brush plate (18) is provided between the first driving roller (13) and the first follower roller (11) and between the second driving roller (14) and the second follower roller (12); the brush plate (18) is fixed to the dust collecting box (3), and the brush plate (18) is in contact with the filter cloth (6).

7. The nano calcium carbonate raw material screening device according to claim 1, characterized in that: A collecting bucket (19) is provided in the dust collecting box (3), the outer edge of the collecting bucket (19) is fixed to the dust collecting box (3), and the collecting bucket (19) is located at the lower side of the air inlet pipe (2).

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