A waste gas treatment device for ABS plastic processing

Abstract

The utility model relates to exhaust treatment technical field, concretely is a kind of exhaust treatment device for ABS plastic processing, it includes: bottom plate, the top of bottom plate is sequentially provided with activated carbon adsorption tower, catalytic combustion equipment, negative pressure fan and spray tower from left to right, the rear side of activated carbon adsorption tower is connected with gas collector pipe;Coarse filter box, the left and right sides of coarse filter box lower end are both connected with gas guide pipe, the lower end of gas guide pipe is connected with gas collection frame cover, the middle end of coarse filter box bottom is connected with loudspeaker gas collection cover.The utility model adds two gas collection frame covers on the both sides of injection molding machine, and can increase the collection efficiency of gas in the moment of injection molding machine mold opening and closing, increase the flow rate of gas, so as to improve the instantaneous gas collection capacity of the device, avoid the situation that instantaneous high concentration exhaust gas breaks through airflow capture range and diffuses outward.

Description

Technical Field

[0001] This utility model relates to the field of waste gas treatment technology, specifically a waste gas treatment device for ABS plastic processing. Background Technology

[0002] ABS plastic processing refers to the process of manufacturing desired products from acrylonitrile-butadiene-styrene copolymer (ABS) through a series of processes. ABS is a thermoplastic with good mechanical strength, impact resistance, processability, and surface gloss, and is widely used in automobiles, electronics, home appliances, toys, and other fields. However, the waste gas generated during ABS plastic processing differs significantly from the waste gas generated from the processing of other materials (such as metals, wood, rubber, and ordinary plastics) in terms of composition, characteristics, and hazards. Its core hazard is the combined effect of toxic organic compounds. Acrylonitrile can cause respiratory irritation, nausea, and vomiting, and long-term exposure may be carcinogenic; styrene can damage the nervous system and hematopoietic function; butadiene is a potential carcinogen and has a high risk of flammability and explosion. Therefore, waste gas treatment devices for ABS plastic processing are required.

[0003] Currently, exhaust gas treatment devices used in ABS plastic processing typically lack instantaneous gas collection structures (such as fast-response side suction hoods). This is because injection molding machines generate short-term high-concentration exhaust gases during mold opening and closing. Without a targeted instantaneous gas collection structure, pulse-like leakage of exhaust gases can easily occur. Compared to the traditional method of installing gas collection hoods on top of injection molding machines, if the installation distance is too far, the instantaneous high-concentration exhaust gases can easily break through the airflow capture range and diffuse outwards, potentially polluting the workshop environment and affecting the health of workers. Therefore, we propose an exhaust gas treatment device for ABS plastic processing. Utility Model Content

[0004] The purpose of this invention is to provide a waste gas treatment device for ABS plastic processing, which has the advantages of instantaneous gas collection structure and good gas collection effect. It solves the problem that, compared with the traditional method of setting up a gas collection hood on the top of the injection molding machine, if the distance is too far, the instantaneous high concentration of waste gas can easily break through the airflow capture range and spread outward, which may pollute the workshop environment and affect the health of workers.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a waste gas treatment device for ABS plastic processing, comprising:

[0006] The base plate has an activated carbon adsorption tower, a catalytic combustion device, a negative pressure fan and a spray tower arranged sequentially from left to right on its top. The activated carbon adsorption tower is connected to a gas collection pipe at its rear.

[0007] The coarse filter box has air guide pipes connected to both the left and right sides of its lower end, and the lower end of the air guide pipes is connected to an air collection frame cover. The middle of the bottom of the coarse filter box is connected to a horn-shaped air collection cover.

[0008] An auxiliary speed-increasing fan is provided, the air inlet of which is connected to the upper end of the coarse filter box via a pipe, and a guide branch pipe is connected between the exhaust end of the auxiliary speed-increasing fan and the air collection pipe.

[0009] Preferably, the activated carbon adsorption tower, catalytic combustion equipment, negative pressure fan and spray tower are connected by pipelines.

[0010] Preferably, the top of the coarse filter box is connected to the rear end of the gas collecting pipe, and a filter screen is provided in the middle of the inner cavity of the coarse filter box.

[0011] Preferably, there are two auxiliary speed-increasing fans, and the two auxiliary speed-increasing fans are respectively fixedly installed at the left and right ends of the top of the coarse filter box.

[0012] Preferably, the outer surface of the gas collecting pipe is fitted with a weather-resistant and heat-insulating sleeve, and the inner side of the weather-resistant and heat-insulating sleeve is provided with an electric heating layer.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] This invention adds two gas collection frames to both sides of the injection molding machine, which can increase the gas collection efficiency and increase the gas flow rate at the moment the injection molding machine opens and closes the mold. This improves the instantaneous gas collection capacity of the device and avoids the situation where high concentrations of exhaust gas break through the airflow capture range and diffuse outward. Attached Figure Description

[0015] Figure 1 This is a first-view structural diagram of the present invention;

[0016] Figure 2 This is a schematic diagram of the second-view structure of the present invention;

[0017] Figure 3 This is a cross-sectional view of the gas collection frame and filter box of this utility model.

[0018] Figure 4 This is a schematic diagram of the combined structure of the horn-shaped air collection cover and the auxiliary speed-increasing fan of this utility model.

[0019] In the diagram: 1. Base plate; 101. Activated carbon adsorption tower; 102. Catalytic combustion equipment; 103. Negative pressure fan; 104. Spray tower; 105. Gas collection pipe; 106. Coarse filter box; 107. Horn-shaped gas collection hood; 108. Filter screen; 2. Weather-resistant insulation jacket; 201. Electric heating layer; 3. Gas guide pipe; 301. Gas collection frame cover; 4. Auxiliary speed-increasing fan; 401. Guide branch pipe. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] The components of this application, including the base plate 1, activated carbon adsorption tower 101, catalytic combustion equipment 102, negative pressure fan 103, spray tower 104, gas collection pipe 105, coarse filter box 106, horn gas collection hood 107, filter screen plate 108, weather-resistant insulation jacket 2, electric heating layer 201, gas guide pipe 3, gas collection frame cover 301, auxiliary speed-increasing fan 4, and guide branch pipe 401, are all general standard parts or parts known to those skilled in the art. Their structure and principle can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0024] Example 1

[0025] Please see Figures 1-4 As shown, this utility model provides a technical solution: a waste gas treatment device for ABS plastic processing, comprising:

[0026] The bottom plate 1 has an activated carbon adsorption tower 101, a catalytic combustion device 102, a negative pressure fan 103 and a spray tower 104 arranged sequentially from left to right on the top of the bottom plate 1. The gas collection pipe 105 is connected to the rear side of the activated carbon adsorption tower 101.

[0027] The coarse filter box 106 has air guide pipes 3 connected to the left and right sides of the lower end of the coarse filter box 106. The lower end of the air guide pipes 3 is connected to the air collection frame cover 301. The middle end of the bottom of the coarse filter box 106 is connected to the horn air collection cover 107.

[0028] The auxiliary speed-increasing fan 4 has its inlet end connected to the upper end of the coarse filter box 106 via a pipe, and its exhaust end is connected to the air collection pipe 105 via a guide branch pipe 401.

[0029] The activated carbon adsorption tower 101, catalytic combustion equipment 102, negative pressure fan 103 and spray tower 104 are connected by pipelines. The top of the coarse filter box 106 is connected to the rear end of the gas collection pipe 105. A filter screen plate 108 is provided in the middle of the inner cavity of the coarse filter box 106. There are two auxiliary speed-increasing fans 4, and the two auxiliary speed-increasing fans 4 are fixedly installed at the left and right ends of the top of the coarse filter box 106 respectively.

[0030] This technical solution involves inspecting the equipment before starting it. Once the equipment is in normal working order, mains power is supplied to the device via the main control switch. Then, the external control device sets the normal operating procedure as described in existing technologies. The negative pressure fan 103 provides negative pressure and driving force for the waste gas treatment. The horn-shaped gas collection hood 107 collects the waste gas, preventing uncontrolled diffusion. The coarse filter box 106, with the assistance of the filter screen 108, pre-filters the collected waste gas. The collected waste gas then enters the activated carbon adsorption tower 101 via the gas collection pipe 105 (the activated carbon adsorption tower 101 typically uses granular or honeycomb activated carbon, with preference given to activated carbon with strong adsorption capacity for benzene series compounds and acrylonitrile). The porous structure of the activated carbon adsorbs VOCs. After the activated carbon becomes saturated... Switching to desorption mode, the activated carbon is back-blown with 120-180℃ hot air (or nitrogen) to decompose the adsorbed VOCs into high-concentration waste gas. After the waste gas enters the catalytic combustion device 102, the high-concentration VOCs are burned at a low temperature of 250-350℃ under the action of the catalyst, decomposing into CO2 and H2O. Then, the waste gas after low-temperature combustion enters the spray tower 104. Through contact with the spray liquid (usually water), the heat in the waste gas is absorbed, thereby reducing the temperature of the waste gas and recovering heat. It also captures and washes away some fine particulate matter that may be generated during the combustion process, such as dust and carbon black, thereby achieving the purpose of removing particulate matter and improving the cleanliness of the waste gas. Finally, it is discharged, thus achieving effective treatment of waste gas (the above treatment methods, steps and equipment are mature steps and products in the existing technology, so they will not be described in detail here).

[0031] By installing the gas collection frame 301 and the air guide pipe 3, a horn-shaped gas collection hood 107 can be installed above the injection molding machine, and gas collection frames 301 can be added to both sides of the injection molding machine (the installation position should be selected according to the needs and should not affect the operation of the equipment; at the same time, the appropriate specification of the gas collection frame hood 301 can be selected according to the model of the injection molding machine). This allows for rapid collection of the short-term high-concentration exhaust gas generated at the moment the injection molding machine opens and closes the mold, avoiding pulse-like leakage of exhaust gas. Simultaneously, the auxiliary speed-increasing fan 4 further enhances the gas collection during the mold opening and closing process. Before, the auxiliary speed-increasing fan 4 will be turned on (usually three seconds before the start of operation) by setting the working program through the external control equipment. When the auxiliary speed-increasing fan 4 is working, it can quickly draw the gas in the coarse filter box 106 through the pipeline and the guide branch pipe 401 and transport it into the gas collection pipe 105. This forces the horn gas collection hood 107 and the gas collection frame hood 301 to instantly accelerate the gas collection speed, thereby further improving the instantaneous gas collection capacity of the device and preventing the instantaneous high concentration of exhaust gas from breaking through the airflow capture range and spreading outward.

[0032] It should be noted that the mold opening and closing actions of an injection molding machine are usually detected by signals emitted by the machine's own sensors. Common detection methods include using position sensors such as proximity switches, photoelectric sensors, or limit switches. These sensors are installed at corresponding positions on the mold or injection molding machine. When the mold opens or closes, the sensors detect the change in mold position and emit an electrical signal. This signal can be transmitted to the injection molding machine's control system to determine the mold opening and closing status and position. For example, when the mold is in the correct position, the mold opening position sensor will emit a signal to inform the control system that the next operation can be performed, such as ejecting the product. The operating program set by the external control equipment will also receive this signal, thereby realizing the control of the auxiliary speed-increasing fan 4 to start. At the same time, the connection methods and electrical connections of the various components of this device all adopt mature and conventional methods in existing technology, so they will not be described in detail here.

[0033] Example 2

[0034] Based on Embodiment 1, this utility model is as follows: Figures 1-4 As shown, the outer surface of the gas collecting pipe 105 is covered with a weather-resistant heat-insulating sleeve 2, and an electric heating layer 201 is provided on the inner side of the weather-resistant heat-insulating sleeve 2.

[0035] This technical solution involves installing a weather-resistant insulation sleeve 2 on the outside of the gas collecting pipe 105 to prevent the temperature from dropping as the exhaust gas flows within the pipe. The electric heating layer 201 allows for heating of the outside of the gas collecting pipe 105 as needed. This heated pipe can then heat the exhaust gas flowing inside, ensuring a stable temperature during heating. This is important because the exhaust gas produced during ABS plastic processing has a high styrene content, and styrene, upon condensation, is a major cause of pipe blockage. Styrene is a low-boiling-point (145℃) but... High-saturated vapor pressure volatile organic compounds (VOCs) can cause styrene vapor to change from a gaseous state to a liquid state during waste gas transmission or treatment if the ambient temperature is lower than its dew point (e.g., when pipes are exposed outdoors in winter or waste gas enters low-temperature pipes without preheating), or if insufficient pipe insulation leads to heat loss. This forms an oily liquid accumulation. Meanwhile, impurities such as plastic debris and dust carried in the waste gas will adsorb the liquid styrene, forming a mixture that is even more difficult to clean. This mixture adheres to the inner wall of the pipe and accumulates over time, leading to blockage. This process can prevent pipe blockage and benefit manufacturers.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.

Claims

1. A waste gas treatment device for ABS plastic processing, characterized in that, include: The bottom plate (1) is provided with an activated carbon adsorption tower (101), a catalytic combustion device (102), a negative pressure fan (103) and a spray tower (104) arranged sequentially from left to right on the top of the bottom plate (1). The gas collection pipe (105) is connected to the rear side of the activated carbon adsorption tower (101). The coarse filter box (106) has air guide pipes (3) connected to the left and right sides of the lower end of the coarse filter box (106), and the lower end of the air guide pipes (3) is connected to the air collection frame cover (301). The middle end of the bottom of the coarse filter box (106) is connected to the horn air collection cover (107). An auxiliary speed-increasing fan (4) is provided. The air inlet of the auxiliary speed-increasing fan (4) is connected to the upper end of the coarse filter box (106) through a pipe. The exhaust end of the auxiliary speed-increasing fan (4) is connected to the air collection pipe (105) by a guide branch pipe (401).

2. The waste gas treatment device for ABS plastic processing according to claim 1, characterized in that: The activated carbon adsorption tower (101), catalytic combustion equipment (102), negative pressure fan (103) and spray tower (104) are connected by pipelines.

3. The waste gas treatment device for ABS plastic processing according to claim 1, characterized in that: The top of the coarse filter box (106) is connected to the rear end of the gas collecting pipe (105), and a filter screen plate (108) is provided in the middle of the inner cavity of the coarse filter box (106).

4. The waste gas treatment device for ABS plastic processing according to claim 1, characterized in that: The number of auxiliary speed-increasing fans (4) is two, and the two auxiliary speed-increasing fans (4) are respectively fixedly installed at the left and right ends of the top of the coarse filter box (106).

5. The waste gas treatment device for ABS plastic processing according to claim 1, characterized in that: The outer surface of the gas collecting pipe (105) is fitted with a weather-resistant heat-insulating sleeve (2), and an electric heating layer (201) is provided on the inner side of the weather-resistant heat-insulating sleeve (2).

Images