Waste gas treatment device for plastic production and processing

By improving the purification and dewatering components, the problem of insufficient contact between the atomizing nozzle and dust in the waste gas treatment device was solved, achieving more efficient waste gas purification and dewatering effects and extending the service life of the activated carbon layer.

CN223945359UActive Publication Date: 2026-02-27NANJING JINSHAN SYNTHETIC MATERIALS CO LTD
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Patent Information

Application Number
CN202520437353.1
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-03-13
Publication Date
2026-02-27
Estimated Expiration
2035-03-13

AI Technical Summary

Technical Problem

In existing waste gas treatment devices, when the second fan draws in waste gas, the water sprayed from the atomizing nozzle does not come into sufficient contact with the dust, which shortens the service life of the activated carbon honeycomb panel and affects the overall treatment effect.

Method used

The system employs purification and dewatering components. A drive motor rotates a bevel gear and a hollow shaft to increase the contact between the waste gas and the treatment agent. Combined with the design of a liquid pump and atomizing nozzles, the purification effect is improved. The dewatering component drives the dewatering device to vibrate through a threaded groove, enhancing the dewatering effect and extending the service life of the activated carbon layer.

Benefits of technology

It improves the purification and water removal effects of waste gas, extends the service life of the activated carbon layer, and enhances the overall processing capacity of the device.

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Abstract

The utility model discloses a waste gas treatment device for plastic production and processing, which belongs to the technical field of waste gas treatment and comprises a treatment box, a water removal component is arranged on the top side in the treatment box, and a purification component is arranged in the treatment box. According to the waste gas treatment device, a driving motor drives a connecting shaft, a second bevel gear, a first bevel gear, a hollow shaft, a connecting sleeve, a gas conveying pipe and a one-way gas outlet to rotate, so that the flowing effect of a treatment agent in the treatment box is improved, waste gas uniformly makes contact with and reacts with the treatment agent, and then the waste gas purification treatment effect of the device is improved; a liquid suction pump sucks the treatment agent on the bottom side in the treatment box through a pipeline and a liquid suction frame, a filter screen can filter liquid in the treatment agent, and then the liquid suction pump sprays the liquid through a connecting pipe, a liquid conveying frame and an atomizing nozzle, so that the liquid is in contact and reacts with the waste gas subjected to primary treatment again; the waste gas purification treatment effect of the device is further improved.
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Description

TECHNICAL FIELD

[0001] The utility model belongs to waste gas treatment technical field especially relates to a waste gas treatment device for plastic production and processing. BACKGROUND

[0002] Plastic is the monomer as raw material, through polyaddition or condensation polymerization and become the high molecular compound, and the plastic will produce dust and waste gas in the production and processing process, because these waste gas direct emission to the air will cause serious pollution to the environment, usually will adopt waste gas treatment device to the gas is handled after discharging.

[0003] Such as Chinese patent document (CN219111290U) a kind of production plastic board waste gas treatment device, including processing box, the front of processing box is hinged with door, the left side of processing box is fixed with first fan, the air outlet end of first fan is fixedly connected with the left side of processing box, the utility model is processed by setting processing box, first fan, water pump, spray pipe, atomizing nozzle, support rod, filter screen, activated carbon honeycomb plate, UV light oxygen purification box and second fan, when the waste gas generated in plastic processing is handled, water in the interior of processing box can be extracted by water pump and sent to spray pipe, dust in waste gas can be separated out after being sprayed by atomizing nozzle, gas after spraying can be secondary treated in waste gas under the action of filter screen and activated carbon honeycomb plate, finally, gas after secondary treatment is purified again in UV light oxygen purification box, avoid the situation that waste gas is not completely purified, but the device in use process, second fan can drive waste gas in the interior of processing box to be extracted, possibly leading to that water sprayed by atomizing nozzle and dust in waste gas contact is poor, and under the action of second fan, enter into activated carbon honeycomb plate, reduce the overall service life of activated carbon honeycomb plate, and further will cause impact on the overall treatment effect of device, therefore, need to be improved. UTILITY MODEL CONTENTS

[0004] The utility model aims at: in order to solve the prior art in use process, second fan can drive waste gas in the interior of processing box to be extracted, possibly leading to that water sprayed by atomizing nozzle and dust in waste gas contact is poor, and under the action of second fan, enter into activated carbon honeycomb plate, reduce the overall service life of activated carbon honeycomb plate, and further will cause impact on the overall treatment effect of device problem, and propose a kind of waste gas treatment device for plastic production and processing.

[0005] In order to achieve the above object, the utility model adopts the following technical scheme:

[0006] A kind of waste gas treatment device for plastic production and processing, including processing box, the interior top side of processing box is provided with water removal component, the interior of processing box is provided with purification component;

[0007] The purification assembly comprises a hollow shaft, a fixing sleeve is communicated with the outer periphery of the hollow shaft through a first through hole, the bottom of the hollow shaft extends to the inside of the treatment box and is fixedly connected with a connecting sleeve, a plurality of second through holes are arranged at the joint of the connecting sleeve and the hollow shaft, a gas delivery pipe is communicated with one side of the second through hole, the gas delivery pipe is communicated with the connecting sleeve, and a plurality of one-way air outlets are arranged in the gas delivery pipe.

[0008] As a further description of the above technical solution:

[0009] The hollow shaft is rotatably connected in the inside of the treatment box, the top end of the hollow shaft extends to the outside of the treatment box and is fixedly connected with a first bevel gear, the first bevel gear is meshingly connected with a second bevel gear on one side, the second bevel gear is fixedly connected with a connecting shaft in the inside, the connecting shaft is fixedly connected with a driving motor at the end away from the second bevel gear, and the bottom of the driving motor is fixedly connected with the top of the treatment box through a support seat.

[0010] As a further description of the above technical solution:

[0011] The fixing sleeve is rotatably connected to the outer periphery of the hollow shaft, and the bottom of the fixing sleeve is fixedly connected with the top of the treatment box, one side of the fixing sleeve is communicated with a gas inlet pipe, one side of the top of the treatment box is communicated with a liquid inlet pipe, and one side of the top of the treatment box is communicated with a gas outlet pipe.

[0012] As a further description of the above technical solution:

[0013] The cross-sectional shape of the gas delivery pipe is U-shaped, and a cylinder is communicated with the end of the gas delivery pipe away from the connecting sleeve, the cylinder is fixedly connected to the outer periphery of the hollow shaft, and the cylinder is communicated with the hollow shaft.

[0014] As a further description of the above technical solution:

[0015] The bottom end of the hollow shaft is fixedly connected with a mounting sleeve, connecting rods are fixedly connected to the two sides of the mounting sleeve, a scraper is fixedly connected to the other end of the connecting rod, and a liquid suction frame is arranged on the other side of the scraper.

[0016] As a further description of the above technical solution:

[0017] A cavity is arranged in one side of the inside of the liquid suction frame, a filter screen is arranged in one side of the inside of the cavity, the filter screen is in contact with the scraper, a liquid suction pump is communicated with the other side of the cavity through a pipeline, an infusion frame is communicated with the output end of the liquid suction pump through a connecting pipe, the cross-sectional shape of the infusion frame is annular, the infusion frame is fixedly connected in the inside of the treatment box, the infusion frame is arranged above the gas delivery pipe, and a plurality of atomizing nozzles are communicated with the inner periphery of the infusion frame.

[0018] As a further description of the above technical solution:

[0019] The water removal assembly comprises a water remover, the water remover is sleeved on the outer periphery of the hollow shaft, the cross-sectional shape of the water remover is arranged as a T shape, a plurality of springs are fixedly connected to the bottom of the water remover, an annular plate is fixedly connected to the bottom of the spring, and one side of the annular plate is fixedly connected to the inner wall of the treatment box.

[0020] Further description of the above technical solution is as follows:

[0021] The hollow shaft is provided with two thread grooves with the same pitch and opposite rotation directions on the outer periphery of the top of the hollow shaft, the hollow shaft is drivingly connected with a lead screw seat through the thread grooves, the lead screw seat is arranged above the water remover, an activated carbon layer is arranged above the water remover, the activated carbon layer is rotatably connected to the outer periphery of the hollow shaft and fixedly connected to the inside of the treatment box, circular through holes are arranged on both sides of the inside of the lead screw seat, a limiting rod is slidably connected to the inside of the circular through hole, the top end of the limiting rod is fixedly connected to the bottom of the activated carbon layer, a circular groove is arranged on the top side of the inside of the water remover, and the limiting rod is slidably connected to the inside of the circular groove.

[0022] The beneficial effects of the present application are as follows:

[0023] 1、In the present application, the purification assembly is arranged, the driving motor drives the connecting shaft, the second bevel gear, the first bevel gear, the hollow shaft, the connecting sleeve, the gas conveying pipe and the one-way gas outlet to rotate, the flow effect of the treatment agent in the treatment box is increased, the waste gas is uniformly contacted and reacted with the treatment agent, and the purification and treatment effect of the device on the waste gas is improved, the liquid pump extracts the treatment agent on the bottom side in the treatment box through the pipeline and the liquid extraction frame, the filter screen filters the liquid in the treatment agent, then the liquid pump is sprayed through the connecting pipe, the liquid conveying frame and the atomizing nozzle, so that the waste gas gas after preliminary treatment is contacted and reacted again, and the purification and treatment effect of the device on the waste gas is further improved.

[0024] 2、In the present application, the water removal assembly is arranged, the hollow shaft drives the lead screw seat to move up and down through the thread grooves with the same pitch and opposite rotation directions, the lead screw seat drives the water remover to move up and down, the vibration effect of the water remover in the use process is increased, and the water removal effect of the water remover on the waste gas is improved, so that the treatment effect and service life of the activated carbon layer on the waste gas are improved. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a whole three-dimensional structure schematic view of the present application;

[0026] Figure 2 It is a three-dimensional structure schematic view of the inside of the treatment box in the present application;

[0027] Figure 3The utility model discloses a partial enlarged structure schematic diagram of A place in the utility model Figure 2 .

[0028] Figure 4 The utility model discloses a partial enlarged structure schematic diagram of B place in the utility model Figure 2 .

[0029] Figure 5 The utility model discloses a partial enlarged structure schematic diagram of C place in the utility model Figure 2 .

[0030] Legend:

[0031] 1, processing box, 2, purification assembly, 201, hollow shaft, 202, first bevel gear, 203, second bevel gear, 204, connecting shaft, 205, drive motor, 206, fixed sleeve, 207, connecting sleeve, 208, gas pipe, 209, one-way air outlet, 210, liquid pumping frame, 211, liquid pumping pump, 212, liquid conveying frame, 213, atomizing nozzle, 214, connecting rod, 215, scraper, 3, water removal assembly, 301, water removal device, 302, spring, 303, annular plate, 304, screw seat. DETAILED DESCRIPTION

[0032] The technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without creative labor fall within the scope of the utility model.

[0033] Please refer to Figures 1-5 , the utility model provides a technical scheme: a plastic production and processing exhaust treatment device, including processing box 1, the inside top side of processing box 1 is provided with water removal assembly 3, and processing box 1 is internally provided with purification assembly 2.

[0034] The purification assembly 2 comprises a hollow shaft 201, the outer periphery of the hollow shaft 201 is communicated with a fixing sleeve 206 through a first through hole, the bottom of the hollow shaft 201 extends to the inside of the treatment box 1 and is fixedly connected with a connecting sleeve 207, a plurality of second through holes are arranged at the joint of the connecting sleeve 207 and the hollow shaft 201, a gas conveying pipe 208 is communicated with one side of the second through hole, the gas conveying pipe 208 is communicated with the connecting sleeve 207, a plurality of one-way gas outlets 209 are arranged in the gas conveying pipe 208, the hollow shaft 201 is rotatably connected in the treatment box 1, the top end of the hollow shaft 201 extends to the outside of the treatment box 1 and is fixedly connected with a first bevel gear 202, a second bevel gear 203 is meshingly connected on one side of the first bevel gear 202, a connecting shaft 204 is fixedly connected in the second bevel gear 203, a driving motor 205 is fixedly connected at the end of the connecting shaft 204 away from the second bevel gear 203, the bottom of the driving motor 205 is fixedly connected with the top of the treatment box 1 through a support seat, the fixing sleeve 206 is rotatably connected on the outer periphery of the hollow shaft 201, and the bottom of the fixing sleeve 206 is fixedly connected with the top of the treatment box 1, a gas inlet pipe is communicated with one side of the fixing sleeve 206, a liquid inlet pipe is communicated with one side of the top of the treatment box 1, a gas outlet pipe is communicated with one side of the top of the treatment box 1, the cross-sectional shape of the gas conveying pipe 208 is U-shaped, a cylinder is communicated with the end of the gas conveying pipe 208 away from the connecting sleeve 207, the cylinder is fixedly connected on the outer periphery of the hollow shaft 201 and is communicated with the hollow shaft 201, an installation sleeve is fixedly connected on the outer periphery of the bottom of the hollow shaft 201, connecting rods 214 are fixedly connected on the two sides of the installation sleeve, a scraper 215 is fixedly connected at the other end of the connecting rod 214, a liquid suction frame 210 is arranged on the other side of the scraper 215, the cross-sectional shape of the liquid suction frame 210 is annular, the bottom of the liquid suction frame 210 is fixedly connected with the inner wall of the treatment box 1, a cavity is arranged in one side of the inside of the liquid suction frame 210, a filter screen is arranged in one side of the inside of the cavity, the filter screen is in contact with the scraper 215, a liquid suction pump 211 is communicated with the other side of the cavity through a pipeline, a liquid conveying frame 212 is communicated with the output end of the liquid suction pump 211 through a connecting pipe, the cross-sectional shape of the liquid conveying frame 212 is annular, the liquid conveying frame 212 is fixedly connected in the treatment box 1 and is arranged above the gas conveying pipe 208, a plurality of atomizing nozzles 213 are communicated with the inner periphery of the liquid conveying frame 212.

[0035] Specifically, the device is installed in place, the treatment agent is delivered into the treatment box 1 through the liquid inlet pipe, the gas inlet pipe is connected to the external waste gas supply device, the external waste gas supply device delivers the waste gas generated during the plastic production into the hollow shaft 201 and the hollow shaft 201, the waste gas in the hollow shaft 201 is sprayed into the treatment agent in the treatment box 1 through the gas delivery pipe 208 and the one-way gas outlet 209, the waste gas is contacted and reacted with the treatment agent, the driving motor 205 and the liquid pump 211 are started according to actual needs, the connecting shaft 204 and the second bevel gear 203 are driven to rotate by the driving motor 205, the power is transmitted to the first bevel gear 202 through the linkage effect between the second bevel gear 203 and the first bevel gear 202, the first bevel gear 202 drives the hollow shaft 201, the connecting sleeve 207, the gas delivery pipe 208 and the one-way gas outlet 209 to rotate, the flow effect of the treatment agent in the treatment box 1 is improved, the waste gas is uniformly contacted and reacted with the treatment agent, and the purification treatment effect of the device on the waste gas is improved. The liquid pump 211 extracts the treatment agent on the bottom side of the treatment box 1 through the pipeline and the liquid extraction frame 210, the filter screen filters the liquid in the treatment agent, then the liquid pump 211 delivers the treatment agent into the liquid delivery frame 212 through the connecting pipe, and then sprays it out through the atomizing nozzle 213, so that it is contacted and reacted with the waste gas after preliminary treatment again, the purification treatment effect of the device on the waste gas is further improved. At the same time, the hollow shaft 201 drives the mounting sleeve, the connecting rod 214 and the scraper 215 to rotate, the surface of the filter screen is cleaned by the scraper 215 to prevent the filter screen from being blocked after a long time, and the overall use performance of the device is improved. According to actual needs, the pipeline can be set as a one-way pipeline.

[0036] The water removal assembly 3 comprises a water remover 301, the water remover 301 is sleeved on the outer peripheral side of the hollow shaft 201, the cross-sectional shape of the water remover 301 is T-shaped, a plurality of springs 302 are fixedly connected to the bottom of the water remover 301, an annular plate 303 is fixedly connected to the bottom of the spring 302, one side of the annular plate 303 is fixedly connected with the inner wall of the treatment box 1, two thread grooves with the same pitch and opposite rotation directions are formed in the top outer peripheral side of the hollow shaft 201, a lead screw seat 304 is drivingly connected to the hollow shaft 201 through the thread grooves, the lead screw seat 304 is arranged above the water remover 301, an activated carbon layer is arranged above the water remover 301, the activated carbon layer is rotatably connected to the outer peripheral side of the hollow shaft 201 and fixedly connected to the inside of the treatment box 1, circular through holes are formed in the inside of the lead screw seat 304 on both sides, limit rods are slidably connected in the circular through holes, the top ends of the limit rods are fixedly connected with the bottom of the activated carbon layer, a circular groove is formed in the top side of the water remover 301, and the limit rods are slidably connected in the circular groove.

[0037] Specific implementation: The treated exhaust gas passes through the water separator 301, which processes the water contained in the exhaust gas to improve the treatment effect and service life of the subsequent activated carbon layer on the exhaust gas. Then, the activated carbon layer purifies the exhaust gas again and discharges it through the gas outlet pipe. The hollow shaft 201 drives the screw seat 304 up and down through the thread grooves with the same pitch and opposite rotation direction, and under the action of the spring 302, the screw seat 304 drives the water separator 301 to move up and down, which assists to increase the vibration effect of the water separator 301 during use, thereby improving the water removal effect of the water separator 301 on the exhaust gas.

[0038] Working principle: In use, first install the device in the appropriate position, then deliver the treatment agent into the treatment box 1 through the liquid inlet pipe, and connect the gas inlet pipe with the external exhaust gas supply device. The external exhaust gas supply device delivers the exhaust gas generated during plastic production into the fixed sleeve 206 and the hollow shaft 201 through the gas inlet pipe. At this time, the exhaust gas in the hollow shaft 201 is injected into the treatment agent inside the treatment box 1 through the gas delivery pipe 208 and the one-way gas outlet 209, so that the exhaust gas and the treatment agent are in contact and reaction. According to actual needs, start the drive motor 205 and the liquid pump 211. The drive motor 205 drives the connecting shaft 204 and the second bevel gear 203 to rotate, and uses the linkage effect between the second bevel gear 203 and the first bevel gear 202 to transmit power to the first bevel gear 202, so that the first bevel gear 202 drives the hollow shaft 201, the connecting sleeve 207, the gas delivery pipe 208 and the one-way gas outlet 209 to rotate, so that the exhaust gas is uniformly in contact and reaction with the treatment agent. The liquid pump 211 extracts the treatment agent on the bottom side of the treatment box 1 through the pipeline and the liquid extraction frame 210. The filter screen filters the liquid in the treatment agent. Then the liquid pump 211 delivers the treatment agent into the liquid delivery frame 212 through the connecting pipe, and then sprays it out through the atomizing nozzle 213, so that it is in contact and reaction with the exhaust gas again. At the same time, the hollow shaft 201 drives the mounting sleeve, the connecting rod 214 and the scraper 215 to rotate, and the scraper 215 cleans the surface of the filter screen. The treated exhaust gas passes through the water separator 301, which processes the water contained in the exhaust gas. Then, the activated carbon layer purifies the exhaust gas again and discharges it through the gas outlet pipe. At the same time, the hollow shaft 201 drives the screw seat 304 up and down through the thread grooves with the same pitch and opposite rotation direction, and under the action of the spring 302, the screw seat 304 drives the water separator 301 to move up and down, improving the removal effect of the device on the water in the exhaust gas.

[0039] The above merely describes a preferred embodiment of the present application, and the protection scope of the present application is not limited thereto, and any skilled person in the art, according to the technical scheme and the inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A plastic production and processing waste gas treatment device comprising a treatment box (1), characterized in that: The processing box (1) is internally provided with a water removal assembly (3), and the processing box (1) is internally provided with a purification assembly (2); The purification assembly (2) comprises a hollow shaft (201), a fixed sleeve (206) is communicated with the outer circumferential side of the hollow shaft (201) through a first through hole, the bottom of the hollow shaft (201) extends to the inside of the processing box (1) and is fixedly connected with a connecting sleeve (207), a plurality of second through holes are formed at the joint of the connecting sleeve (207) and the hollow shaft (201), a gas delivery pipe (208) is communicated with one side of the second through hole, the gas delivery pipe (208) is communicated with the connecting sleeve (207), and a plurality of one-way air outlets (209) are formed in the gas delivery pipe (208).

2. The plastic production and processing waste gas treatment device according to claim 1, characterized in that: The hollow shaft (201) is rotatably connected in the processing box (1), the top end of the hollow shaft (201) extends to the outside of the processing box (1) and is fixedly connected with a first bevel gear (202), one side of the first bevel gear (202) is meshingly connected with a second bevel gear (203), the inside of the second bevel gear (203) is fixedly connected with a connecting shaft (204), the end of the connecting shaft (204) away from the second bevel gear (203) is fixedly connected with a driving motor (205), and the bottom of the driving motor (205) is fixedly connected with the top of the processing box (1) through a support seat.

3. The plastic production and processing waste gas treatment device according to claim 2, characterized in that: The fixed sleeve (206) is rotatably connected to the outer circumferential side of the hollow shaft (201), and the bottom of the fixed sleeve (206) is fixedly connected to the top of the processing box (1). One side of the fixed sleeve (206) is communicated with a gas inlet pipe, one side of the top of the processing box (1) is communicated with a liquid inlet pipe, and one side of the top of the processing box (1) is communicated with a gas outlet pipe.

4. The plastic production and processing waste gas treatment device according to claim 3, characterized in that: The cross-sectional shape of the gas delivery pipe (208) is U-shaped, and the end of the gas delivery pipe (208) away from the connecting sleeve (207) is communicated with a cylinder, which is fixedly connected to the outer circumferential side of the hollow shaft (201) and communicated with the hollow shaft (201).

5. The plastic production and processing waste gas treatment device according to claim 4, characterized in that: The bottom end of the hollow shaft (201) is fixedly connected with a mounting sleeve, and connecting rods (214) are fixedly connected to the two sides of the mounting sleeve. The other end of the connecting rod (214) is fixedly connected with a scraper (215). The other side of the scraper (215) is provided with a liquid pumping frame (210). The cross-sectional shape of the liquid pumping frame (210) is annular, and the bottom of the liquid pumping frame (210) is fixedly connected with the inner wall of the processing box (1).

6. The plastic production and processing waste gas treatment device according to claim 5, characterized in that: A cavity is formed in one side of the inside of the liquid pumping frame (210), a filter screen is arranged on one side of the inside of the cavity, the filter screen is in contact with the scraper (215), the other side of the cavity is communicated with a liquid pumping pump (211) through a pipeline, the output end of the liquid pumping pump (211) is communicated with a liquid delivery frame (212) through a connecting pipe, the cross-sectional shape of the liquid delivery frame (212) is annular, the liquid delivery frame (212) is fixedly connected in the processing box (1), and the liquid delivery frame (212) is arranged above the gas delivery pipe (208). The inner circumferential side of the liquid delivery frame (212) is communicated with a plurality of atomizing nozzles (213).

7. The plastic production and processing waste gas treatment device according to claim 6, characterized in that: The water removal assembly (3) comprises a water remover (301) which is sleeved on the outer circumferential side of the hollow shaft (201), the cross-sectional shape of the water remover (301) is T-shaped, a plurality of springs (302) are fixedly connected to the bottom of the water remover (301), an annular plate (303) is fixedly connected to the bottom of the spring (302), and one side of the annular plate (303) is fixedly connected to the inner wall of the treatment box (1).

8. The plastic production and processing waste gas treatment device according to claim 7, characterized in that: Two thread grooves with the same pitch and opposite rotation directions are formed on the outer circumferential side of the top of the hollow shaft (201), the hollow shaft (201) is drivingly connected with a lead screw seat (304) through the thread grooves, the lead screw seat (304) is arranged above the water remover (301), an activated carbon layer is arranged above the water remover (301), the activated carbon layer is rotatably connected to the outer circumferential side of the hollow shaft (201), and the activated carbon layer is fixedly connected to the inside of the treatment box (1), circular through holes are formed in the inside of both sides of the lead screw seat (304), a limiting rod is slidably connected in the circular through holes, the top end of the limiting rod is fixedly connected to the bottom of the activated carbon layer, a circular groove is formed in the top side of the inside of the water remover (301), and the limiting rod is slidably connected in the circular groove.

Citation Information

Patent Citations

  • Waste gas treatment device for producing plastic plates

    CN219111290U