Lower feeding and coating device of wall flow type carrier

Abstract

The utility model relates to the technical field of wall flow type carrier processing, in particular to a lower feeding coating device of a wall flow type carrier, which comprises a coating pool, a coating cavity is arranged in the coating pool, a clamp is arranged above the coating pool and used for placing a carrier to be coated above the coating cavity, a first valve is arranged at the bottom of the coating pool, and a second valve is arranged at the bottom of the coating pool and used for placing the carrier to be coated above the coating cavity. A second valve is arranged on the side wall; the tank body is connected to the first valve, and when the first valve is opened, the coating cavity is communicated with the tank body. According to the utility model, the coating pool is arranged, the clamp fixes the carrier above the coating pool, the tank body for temporarily storing slurry is arranged below the coating pool, and the slurry circulating system is connected with the tank body and the coating pool, so that the slurry can be poured into the carrier from the lower part, and the coating mode has low requirement on the viscosity of the slurry and good fluidity of the slurry; and the slurry can fully enter the pore channels of the carrier, and the suction and recovery speed of the slurry after coating is high, so that the energy consumption during equipment processing is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of wall flow type carrier processing, in particular to a lower feeding coating device of a wall flow type carrier. Background Art

[0002] Wall-flow carriers usually refer to a honeycomb ceramic filter with a special structure, the most representative of which is the diesel particulate filter (DPF). The structure of the wall-flow carrier is usually honeycomb-shaped with a large number of parallel channels. When the exhaust gas passes through the carrier, the gas is forced to pass through the wall from the open inlet channel into the adjacent closed channel, thereby achieving the capture of particulate matter. The wall-flow carrier needs to be coated with a catalyst. After the catalyst is coated, the wall-flow carrier can more effectively catalyze the reaction of harmful substances in the exhaust gas and improve the purification efficiency.

[0003] Traditional coating usually uses top-feed coating. In order to ensure that the coating is in place, the slurry is thickened to increase the viscosity, and poured onto the upper end surface of the carrier through quantitative feeding flow. Through vacuum suction on the lower end surface of the carrier, it is generally necessary to coat the complete carrier twice. Due to the special pores of the wall-flow carrier, the air resistance is large when the airflow passes through, and the viscosity of the slurry in the top-feed coating method is also large, so that the slurry will stay on the surface of the carrier, and the back pressure of the finished coating product is large, resulting in high energy consumption during coating. Utility Model Content

[0004] In view of the technical problems existing in the wall-flow carrier in the prior art, the first aspect of the utility model provides a lower feeding coating device for the wall-flow carrier, comprising:

[0005] A coating pool, wherein a coating cavity is provided inside the coating pool, a fixture is provided above the coating pool for placing the carrier to be coated above the coating cavity, a first valve is provided at the bottom of the coating pool, and a second valve is provided on the side wall;

[0006] A tank body connected to the first valve, when the first valve is opened, the coating chamber is connected to the tank body, a third valve is provided on the upper part of the tank body, a fourth valve is provided on the bottom of the tank body, and the third valve is connected to a vacuum pumping component;

[0007] A slurry circulation system, wherein the discharge end is connected to the second valve, and the feed end is connected to the fourth valve;

[0008] A liquid level sensor is arranged above the coating pool and is used to detect whether the slurry overflows to the top of the carrier to be coated;

[0009] The slurry circulation system is used to inject slurry into the coating chamber, so that the slurry spreads upward from the bottom of the carrier to be coated along its pores to achieve coating of the carrier to be coated.

[0010] Preferably, the clamp comprises a lower clamp and an upper clamp, the lower clamp is connected to the coating pool, and the upper clamp extends above the upper end surface of the carrier to be coated.

[0011] Preferably, the lower clamp and the upper clamp comprise a silicone rubber airbag, and the silicone rubber airbag is configured to clamp the edge of the wall flow carrier after being inflated.

[0012] Preferably, the lower fixture is detachably connected to the coating tank.

[0013] Preferably, the first valve comprises a pneumatic butterfly valve.

[0014] Preferably, the second valve comprises a pneumatic clamp valve, and a flow meter is provided at the second valve for detecting the total amount of slurry injected into the coating pool.

[0015] Preferably, the fourth valve is located at the lowest position of the tank body, and the third valve is located at the highest position of the tank body.

[0016] Preferably, the second valve is also connected to a local coating container, and the local coating container and the slurry circulation system are not connected to the second valve at the same time.

[0017] Compared with the prior art, the advantages of the utility model are:

[0018] The utility model provides a coating pool, a clamp fixes the carrier to the top of the coating pool, a tank body for temporarily storing slurry is provided below the coating pool, a slurry circulation system connects the tank body and the coating pool, thus forming a slurry coating device with bottom feeding, which can realize slurry perfusion to the carrier from below. This coating method has low requirements on the viscosity of the slurry and has good fluidity. Not only can the slurry fully enter the pores of the carrier, but also the slurry can be quickly sucked and recovered after coating, so as to reduce energy consumption during equipment processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are not intended to be drawn to scale. In the accompanying drawings, each identical or nearly identical component shown in various figures may be represented by the same reference numeral. For the sake of clarity, not every component is labeled in each figure. Now, embodiments of various aspects of the utility model will be described by way of example and with reference to the accompanying drawings, in which:

[0020] Figure 1 It is a structural schematic diagram of a lower feeding coating device of a wall-flow carrier shown in the first embodiment of the utility model;

[0021] Figure 2It is a schematic diagram of the slurry coating the wall flow type carrier from bottom to top shown in the first embodiment of the utility model;

[0022] Figure 3 It is a schematic diagram of the slurry recovery from suction shown in the first embodiment of the utility model;

[0023] Figure 4 It is a schematic diagram of realizing partial coating of a wall flow carrier shown in the second embodiment of the utility model. DETAILED DESCRIPTION

[0024] In order to better understand the technical content of the present invention, specific embodiments are described below in conjunction with the accompanying drawings.

[0025] like Figure 1 As shown, the first embodiment of the utility model proposes a wall-flow carrier bottom feeding coating device, comprising a coating pool 10, a tank body 20, a slurry circulation system 30 and a liquid level sensor 40. The utility model aims to coat the carrier by bottom feeding. Different from top feeding, bottom feeding can completely penetrate every pore of the carrier. Therefore, the fluidity of the slurry is high, rather than requiring the slurry to be viscous. Therefore, when the slurry is prepared, the fluidity of the slurry is greater.

[0026] A coating chamber 101 is provided inside the coating pool 10 , a fixture is provided above the coating pool 10 for placing the carrier to be coated above the coating chamber 101 , and a second valve 14 is provided on the side wall of the coating pool 10 .

[0027] Thus, before coating the carrier, the carrier is fixed above the coating tank 10 by a clamp. During coating, the slurry is injected into the coating tank 10 so that the slurry covers the entire carrier from bottom to top.

[0028] Specifically, when the second valve 14 is opened, the slurry circulation system 30 can inject slurry into the coating chamber 101, so that the slurry spreads upward from the bottom of the carrier to be coated along the pores thereof, thereby coating the carrier to be coated.

[0029] Furthermore, in order to facilitate detection of whether the slurry completely submerges the carrier, a liquid level sensor 40 is provided above the coating pool 10 to detect whether the slurry overflows to the top of the carrier to be coated.

[0030] When the slurry overflows and submerges the top of the substrate 100 to be coated, Figure 2 As shown, when the liquid level sensor 40 detects that the liquid level has reached the target height, the loading of the slurry circulation system 30 is stopped and the second valve 14 is closed.

[0031] Furthermore, a first valve 13 is provided at the bottom of the coating pool 10, and the tank body 20 is connected to the first valve 13. When the first valve 13 is opened, the coating chamber 101 is connected to the tank body 20. A third valve 21 is provided on the upper part of the tank body 20, and a fourth valve 22 is provided at the bottom of the tank body 20. The third valve 21 is connected to the vacuum pumping component.

[0032] In this way, when the slurry covers the carrier from bottom to top, it is necessary to extract the excess slurry, the vacuum component is opened, and a negative pressure is formed in the tank body 20, and the first valve 13 is opened. Figure 3 As shown, the slurry in the pores of the carrier is sucked out and prepared for recycling the slurry. It can be understood that due to the negative pressure, the excess slurry can be quickly recovered into the tank 20.

[0033] Furthermore, the discharge end of the slurry circulation system 30 is connected to the second valve 14 , and the feed end of the slurry circulation system 30 is connected to the fourth valve 22 .

[0034] Thus, when the fourth valve 22 is opened, the slurry recovered in the tank 20 can be sucked into the slurry circulation system 30 to be prepared for the next coating.

[0035] Preferably, the fourth valve 22 is located at the lowest position of the tank body 20 , and the third valve 21 is located at the highest position of the tank body 20 .

[0036] In this way, when the excess slurry in the coating chamber 101 and the carrier is sucked into the tank body 20, the fourth valve 22 will not be blocked. At the same time, when discharging the slurry temporarily stored in the tank body 20, since the third valve 21 is at the lowest point, the slurry can be completely recovered to the end of the slurry circulation system 30.

[0037] In the above-mentioned embodiment, the clamp includes a lower clamp 11 and an upper clamp 12, the lower clamp 11 is connected to the coating tank 10, and the upper clamp 12 extends above the upper end surface of the carrier to be coated.

[0038] Optionally, the lower clamp 11 and the upper clamp 12 include a silicone rubber airbag, which is configured to clamp the edge of the wall-flow carrier after being inflated.

[0039] The airbag is used to clamp the carrier to be coated, which can ensure sealing and can clamp carriers of different sizes.

[0040] Furthermore, the lower clamp 11 is detachably connected to the coating pool 10. Thus, if the size of the carrier changes more, the current airbag is not sufficient to fully perform adaptive clamping, and the carriers of different sizes can be clamped by replacing the lower clamp 11.

[0041] In the above embodiment, the first valve 13 may be a pneumatic butterfly valve. The second valve 14 may be a pneumatic clamp valve. A flow meter is provided at the second valve 14 to detect the total amount of slurry injected into the coating pool 10 .

[0042] In the second embodiment shown in the present application, the second valve 14 is also connected to the partial coating container 50 , and the partial coating container 50 and the slurry circulation system 30 are not connected to the second valve 14 at the same time.

[0043] It can be understood that when local coating of the pores in the carrier is required, the traditional upper feeding method cannot be implemented. The above-mentioned embodiment is not easy to control the liquid level height of the slurry entering the carrier, that is, the accuracy of local coating cannot be guaranteed. Therefore, by connecting the local coating container 50 to the second valve 14, the upper end of the local coating container 50 is open. Therefore, the local coating container 50 and the multiple pores in the carrier constitute a connector, and the liquid level of the slurry in the pores in the carrier can be reflected by the liquid level of the slurry in the local coating container 50.

[0044] In this way, when performing local coating, the slurry is slowly injected into the local coating container 50, and the slurry height in the local coating container 50 is continuously monitored to accurately reflect the slurry position in the pores in the carrier to achieve local coating. After coating, the excess slurry is also recovered through the tank body 20.

[0045] In combination with the above embodiments, the utility model sets a coating pool, and a clamp fixes the carrier to the top of the coating pool. A tank body for temporarily storing slurry is provided below the coating pool. The slurry circulation system connects the tank body and the coating pool, thereby forming a bottom-feed slurry coating device, which can realize slurry perfusion on the carrier from below. This coating method has low requirements on the viscosity of the slurry and has good fluidity. It can not only fully enter the pores of the carrier, but also has a fast suction and recovery speed for the slurry after coating, so as to reduce energy consumption during equipment processing.

[0046] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. A person with ordinary knowledge in the technical field to which the present invention belongs may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the definition of the claims.

Claims

1. A wall-flow carrier bottom feeding coating device, characterized in that: include: A coating pool (10), wherein a coating chamber (101) is provided inside the coating pool (10), a fixture is provided above the coating pool (10) for placing a carrier to be coated above the coating chamber (101), a first valve (13) is provided at the bottom of the coating pool (10), and a second valve (14) is provided on the side wall; A tank body (20) is connected to the first valve (13). When the first valve (13) is opened, the coating chamber (101) is connected to the tank body (20). A third valve (21) is provided at the top of the tank body (20). A fourth valve (22) is provided at the bottom of the tank body (20). The third valve (21) is connected to a vacuum pumping component. A slurry circulation system (30), wherein the discharge end is connected to the second valve (14), and the feed end is connected to the fourth valve (22); A liquid level sensor (40) is arranged above the coating pool (10) and is used to detect whether slurry overflows to the top of the carrier to be coated; The slurry circulation system (30) is used to inject slurry into the coating chamber (101), so that the slurry spreads upward from the bottom of the carrier to be coated along its pores, thereby coating the carrier to be coated.

2. The bottom feeding coating device of the wall flow carrier according to claim 1 is characterized in that: The clamp comprises a lower clamp (11) and an upper clamp (12), wherein the lower clamp (11) is connected to the coating pool (10), and the upper clamp (12) extends above the upper end surface of the carrier to be coated.

3. The bottom feeding coating device of the wall flow carrier according to claim 2 is characterized in that: The lower clamp (11) and the upper clamp (12) comprise a silicone rubber airbag, which is configured to clamp the edge of the wall flow carrier after being inflated.

4. The bottom feeding coating device of the wall flow carrier according to claim 2, characterized in that: The lower clamp (11) is detachably connected to the coating pool (10).

5. The bottom feeding coating device of the wall flow carrier according to claim 1, characterized in that: The first valve (13) comprises a pneumatic butterfly valve.

6. The bottom feeding coating device of the wall flow carrier according to claim 1, characterized in that: The second valve (14) comprises a pneumatic pipe clamp valve, and a flow meter is provided at the second valve (14) for detecting the total amount of slurry injected into the coating pool (10).

7. The bottom feeding coating device of the wall flow carrier according to claim 1, characterized in that: The fourth valve (22) is located at the lowest position of the tank body (20), and the third valve (21) is located at the highest position of the tank body (20).

8. The bottom feeding coating device of the wall flow carrier according to claim 1, characterized in that: The second valve (14) is also connected to a local coating container (50), and the local coating container (50) and the slurry circulation system (30) are not connected to the second valve (14) at the same time.

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