CN115990543A - A safe and efficient clean production method for reducing crushing and screening dust - Google Patents

Abstract

The invention discloses a clean production method for safely and efficiently reducing broken and screened dust, which comprises the following steps: dust generated by the work of the jaw crusher, the cone crusher and the vibrating screen is sucked into the dust remover by the dust hood, and the crushed products after the work of the jaw crusher and the cone crusher fall onto the belt of the first belt conveyor and the dust lifted by the belt is sucked into the dust remover by the dust hood; the dust entering the dust remover is settled under the action of self gravity and falls into the ore collecting pool from the sewage outlet of the dust remover; and (3) automatically flowing overflow water at the upper layer of the ore collecting tank to a reservoir, after the ore pulp at the bottom of the ore collecting tank is accumulated, conveying water in the reservoir to the ore collecting tank and pulping, automatically flowing ore pulp to a transfer tank, and conveying the ore pulp in the transfer tank to a production system. The invention has simple flow and high dust removal efficiency, realizes the effective control of dust discharge, combines the production water to make slurry, ensures that the collected dust enters a production system, improves the utilization rate of the dust and the production water, and saves resources and production cost.

Description

A safe and efficient clean production method for reducing crushing and screening dust

technical field

The invention belongs to the field of clean production, in particular to a clean production method for safely and efficiently reducing crushing and screening dust.

Background technique

The rapid development of industry will inevitably cause a certain amount of environmental pollution. Coal mines, cement, thermal power, chemical and other industries will produce a large amount of dust in the production process, which not only pollutes the working environment of the factory, but also threatens the health of workers. In this regard, dust collectors play a very important role in industrial production and environmental protection. At the same time, with the improvement of people's living standards, people's requirements for the living environment have also increased, and the national policy on the emission limit of particulate matter has also continued to increase, making the requirements for dust collectors in production more and more high. In a sense, it can no longer meet the actual use requirements now.

During the crushing, discharging and screening process of existing crushing and screening equipment, due to the relatively small diameter of dust particles, it will be separated from the stone and float in the air, resulting in poor air quality in the surrounding environment. It is easy to be sucked into the body and cause certain damage to the body of the staff. The existing methods generally adopt: 1. The fan leads it out of the working environment, or, 2. Spray water to suppress the dust, but the dust drawn out of the working environment causes external Environmental pollution, dust discharge is easy to exceed the standard; at the same time, both methods cause waste of stone dust resources, resulting in poor practicability.

Contents of the invention

The technical problem to be solved by the present invention is to provide a safe and efficient clean production method for reducing crushing and screening dust in view of the deficiencies of the above-mentioned prior art. The clean production method for safely and efficiently reducing crushing and screening dust has a simple process and high dust removal efficiency. In order to effectively control the dust emission, at the same time, it is combined with the production water to make slurry, so that the collected dust enters the production system, improves the utilization rate of dust and water, and saves resources and production costs.

For realizing above-mentioned technical purpose, the technical scheme that the present invention takes is:

A safe and efficient clean production method for reducing crushing and screening dust, including: the dust generated by jaw crushers, cone crushers and vibrating screens is sucked into the dust collector by dust suction hoods and pipes, while jaw crushers and cone crushers are After the crusher works, the broken products fall on the belt of the first belt conveyor, and the dust raised is also sucked into the dust collector by the dust suction cover and the pipeline; the dust entering the dust collector settles under its own gravity and is discharged from the dust collector The sewage outlet falls into the ore collection pool; the upper overflow water of the ore collection pool enters the storage tank by gravity, and after the bottom of the ore collection pool has accumulated to a certain extent, the water in the storage tank is transported to the ore collection pool to wash and clean the slurry. Slurry is made, and then the pulp flows into the transfer tank by itself, and the pulp in the transfer tank is transported to the production system.

As a further improved technical solution of the present invention, the dust collector is a microporous membrane filter dust collector, and the large particle dust entering the microporous membrane filter dust collector settles into the lower box of the microporous membrane filter dust collector under the action of its own gravity ;Small particles of dust enter the microporous membrane of the microporous membrane filter dust collector with the airflow. Under the action of the pressure difference, the dusty airflow is filtered on the microporous membrane, and the filtered clean air is discharged through the air outlet of the microporous membrane filter dust collector. , the dust is trapped on the microporous membrane. When the dust on the surface of the microporous membrane accumulates to a certain thickness, the dust will fall off to the lower box by its own gravity, and the dust stuck on the microporous membrane will be blown off by the compressed air to the lower box. The dust in the box body and the lower box is discharged from the sewage outlet at the bottom of the lower box body, and the dust falls into the ore collection pool for sedimentation. Finally, pump the water in the reservoir to the ore collection pool to flush and make pulp, then the pulp flows into the transfer pool through the pipeline, and then the pulp in the transfer pool is transported to the production system through the pump.

As a further improved technical solution of the present invention, the discharge port of the jaw crusher communicates with the feed port of the vibrating screen through the first belt conveyor, and the coarse particle discharge port of the vibrating screen passes through the second belt conveyor. It communicates with the feed port of the cone crusher, and the discharge port of the cone crusher communicates with the feed port of the vibrating screen through the first belt conveyor.

As a further improved technical solution of the present invention, the crushing cavity shell of the jaw crusher is connected with a dust suction hood, the discharge port of the jaw crusher is connected with a dust suction hood, and the discharge port of the jaw crusher is The suction hood at is covered on the belt of the first belt conveyor.

As a further improved technical solution of the present invention, a dust suction hood is provided above the feed port of the cone crusher, a dust suction hood is connected to the discharge port of the cone crusher, and the suction at the discharge port of the cone crusher is The dust cover covers the belt of the first belt conveyor.

As a further improved technical solution of the present invention, a closed box is provided around the feed port of the cone crusher, and the closed box is sealed and communicated with the dust collection hood. The closed box is also provided with an observation port. A rubber pad is provided around the mouth, and the observation port is hinged with a cover plate through a hinge, and the cover plate is sealed and closed with the rubber pad.

As a further improved technical solution of the present invention, the dust suction hood sealed and connected to the discharge port of the jaw crusher and the dust suction hood sealed and connected to the discharge port of the cone crusher are integrally structured, and the integrated structure is integrated with the first belt conveyor The belt on the belt is connected by a belt skin seal sliding connection.

As a further improved technical solution of the present invention, the angle between the suction hood that is sealed and communicated with the discharge port of the jaw crusher and the discharge channel of the jaw crusher is 50-70°, and the discharge port of the cone crusher The angle between the dust suction hood that is sealed and communicated with the discharge port of the cone crusher is 50-70°.

As a further improved technical solution of the present invention, the vibrating screen adopts a fully enclosed vibrating screen, and the fully enclosed vibrating screen of the vibrating screen is sealed and communicated with a dust collection cover.

As a further improved technical solution of the present invention, the bottom of the ore collection pool has a certain inclination angle to the horizontal plane, and there is a height difference between the outlet of the bottom of the ore collection pool and the feed port of the transfer pool, so that the ore pulp flows into the transfer tank by itself through the pipeline. pool, the lower end of the feed port of the transfer pool is provided with a filter.

The beneficial effects of the present invention are:

The feeding end of the jaw crusher, cone crusher and vibrating screen of the present invention realizes a fully closed state, which can effectively prevent dust from escaping. At the same time, an observation port is set at the feeding end to pay attention to the feeding situation at any time; The dust generated by the cone crusher and the vibrating screen is transported to the dust collector by the dust hood and the pipeline. There is a closed box around the feed port of the cone crusher, and the closed box of the cone crusher is sealed with the dust hood. Connected, so that the dust near the feed inlet and the feed belt head is transported to the dust collector through the dust suction hood to effectively collect dust; the angle between the dust suction hood above the first belt conveyor and the discharge groove of the crusher is controlled. In the range of 50-70°, it can not only prevent the coarse particle material on the belt from being sucked into the belt when the angle is too small, but also avoid the problem of low dust absorption rate when the angle is too large; between the dust suction hood above the first belt conveyor and the belt The belt side skin is used for sealed sliding connection, which can make it a closed whole without affecting the normal operation of the belt; the process is simple, the service life is long, the dust collection efficiency is high, and the total dust collection efficiency can reach 99.9~ 99.99%; the dust is collected by the high-efficiency filter dust collector through the microporous membrane. The dust with larger particles entering the dust collector will settle into the lower box of the dust collector under the action of its own gravity due to the slowing down of the airflow velocity, and the dust with smaller particles will flow with the airflow. Enter the microporous membrane filter material, under the action of pressure difference, the dust-laden airflow is filtered on the microporous membrane, the dust is trapped on the microporous membrane, and the filtered clean air is discharged through the air outlet, which realizes the effective control of dust emission , when the dust on the surface of the microporous membrane accumulates to a certain thickness, most of the dust will fall off to the lower box by its own gravity, and the dust stuck on the microporous membrane will be blown off by compressed air to the lower box, and then The dust in the box is discharged from the sewage outlet to the collection pool; the collection pool is set up as a slope to store materials, which is conducive to the collection of dust and the flushing of production water, and the discharge port of the collection pool and the feed port of the transfer pool are provided with certain The difference in height facilitates the self-flow of ore pulp into the transfer tank and avoids pipeline blockage; the lower end of the feed port of the transfer tank is equipped with a filter to filter some impurities so as not to block the pipeline, which is conducive to the normal operation of the system; the upper overflow water in the collection tank enters the storage tank The production water in the water tank and the storage tank is used to wash the dust falling into the mining pool to realize the recycling of the production water. At the same time, the ore pulp formed in the mining pool finally enters the production system for sorting, effectively improving the utilization rate of dust and realizing resource utilization. Comprehensive utilization.

Description of drawings

Fig. 1 is the structural representation of the clean production device of the present invention that reduces crushing and screening dust safely and efficiently;

Fig. 2 is a schematic diagram of the crushing plant structure of the clean production device for safely and efficiently reducing crushing and screening dust of the present invention;

Fig. 3 is a schematic view of the structure of the observation port of the clean production device for safely and efficiently reducing crushing and screening dust of the present invention;

Fig. 4 is a schematic diagram of the structure of the dust collector area of the clean production device for safely and efficiently reducing crushing and screening dust of the present invention;

Among them, 1. Jaw crusher; 2. Cone crusher; 3. Vibrating screen; 4. Dust collector; , observation port; 10, drip groove; 11, vacuum cover; 12, belt edge; 13 closed box; 14, hinge; 15, cover plate; 16, rubber pad; 17, air inlet; 18, air outlet ; 19, the upper box; 20, the lower box; 21, the sewage outlet; 22, the first belt conveyor; 23, the second belt conveyor; 24, the pipeline.

Detailed ways

The specific embodiment of the present invention is described further below according to accompanying drawing:

As shown in Figure 1, this embodiment provides a safe and efficient clean production device for reducing crushing and screening dust, including a jaw crusher 1, a cone crusher 2, a vibrating screen 3, a dust collector 4, a collection pool 5, a storage The pool 6 and the transfer pool 7; the jaw crusher 1, the cone crusher 2 and the vibrating screen 3 are all equipped with a dust collection cover 11, and a plurality of suction covers 11 pass through the air inlet of the pipeline 24 and the dust collector 4 respectively. 17 connected; the dust collector 4 is placed above the mine pool 5; the reservoir 6 is located on one side of the mine pool 5 so as to ensure that the upper overflow water of the mine pool 5 enters the reservoir 6, and the mine pool The discharge port at the bottom of the pool 5 is connected with the transfer pool 7 through the pipeline 24; the reservoir 6 is connected with the ore pool 5 through the pump and the pipeline 24, and the water in the pool 5 and the reservoir 6 is recycled; the transfer The slurry in the pool 7 is used to enter the production system through the pipeline 24 and the pump.

Specifically, as shown in Figure 1, the discharge port of the jaw crusher 1 is communicated with the feed port of the vibrating screen 3 through the first belt conveyor 22, and the coarse particle discharge port of the vibrating screen 3 (also That is, the coarse particle return box 8) is communicated with the feed port of the cone crusher 2 by the second belt conveyor 23, and the discharge port of the cone crusher 2 is connected with the feed port of the vibrating screen 3 by the first belt conveyor 22 connected.

As shown in Figure 2, the plurality of suction hoods 11 at the jaw crusher 1 are respectively placed in the crushing chamber of the jaw crusher 1 and the dust is discharged to the first belt conveyor 22, that is, the jaw The shell of the crushing chamber of the jaw crusher 1 is connected with a dust collection cover 11, and the discharge port of the jaw crusher 1 is connected with a dust collection cover 11, and the dust collection cover 11 at the discharge port of the jaw crusher 1 is covered On the belt of the first belt conveyor 22 .

As shown in Figure 2, a plurality of suction hoods 11 at the cone crusher 2 are respectively placed above the feed inlet and the dust is discharged to the first belt conveyor 22; that is, the feed of the cone crusher 2 A dust collection cover 11 is provided above the feed port, specifically, a closed box 13 is covered around the feed port of the cone crusher 2 and the outside of the feed belt head of the second belt conveyor 23, and the closed box 13 is sealed and fixedly connected with the shell of the cone crusher 2, and the closed box 13 is sealed and communicated with the dust collection cover 11. The closed box 13 is also provided with an observation port 9, as shown in Figure 3, the observation port 9 Rubber pads 16 are arranged around, and the observation port 9 is hinged with a cover plate 15 (using a steel plate) through a hinge 14, and the cover plate 15 is sealed and closed with the rubber pad 16; the discharge port of the cone crusher 2 is connected There is a dust suction hood 11, and the dust suction hood 11 at the discharge port of the cone crusher 2 is covered on the belt of the first belt conveyor 22.

The suction hood 11 of the discharge port of the jaw crusher 1 and the discharge port of the cone crusher 2 are integrally structured, and the integrated structure passes through the belt on the first belt conveyor 22 The belt edge skin 12 seals the sliding connection.

As shown in Figure 2, the angle between the suction hood 11 that is sealed and communicated with the discharge port of the jaw crusher 1 and the discharge channel 10 of the jaw crusher 1 is 50-70°, and the cone crusher 2 The angle between the suction hood 11 that is sealed and communicated with the discharge port and the discharge port gutter 10 of the cone crusher 2 is 50-70°.

The vibrating screen 3 adopts a fully enclosed vibrating screen 3 , and the upper box of the fully enclosed vibrating screen 3 of the vibrating screen 3 is sealed and communicated with a dust collection cover 11 .

The dust collector 4 is a DZF4-2.0 microporous membrane high-efficiency filter dust collector, which consists of a dust collector air inlet 17, a filter system, an air outlet 18, ash cleaning system, an upper box 19, a lower box 20, and an ash unloading device. composition. As shown in Figure 4, the bottom of the dust collector 4 is provided with a sewage outlet 21, and the sewage outlet 21 is connected with a sewage valve. Go to mining pool 5.

The bottom of the ore collection pool 5 has a certain inclination angle to the horizontal plane, and there is a height difference between the outlet of the bottom of the ore collection pool 5 and the feed port of the transfer pool 7, so that the ore pulp in the ore collection pool 5 flows in through the pipeline 24 A transfer pool 7, the lower end of the feed port of the transfer pool 7 is provided with a filter.

The jaw crusher 1, the cone crusher 2 and the feed end of the vibrating screen 3 in this embodiment are all covered with a closed box 13 to prevent the dust at the feed end from entering the production environment. Observation port 9, as shown in Figure 3, is also provided with observation port 9 on the closed casing 13, is provided with rubber pad around described observation port 9, and described observation port 9 is hinged with cover plate 15 by hinge 14, is To achieve a better sealing effect, the rubber pad is placed between the closed box body 13 and the cover plate 15, and the cover plate 15 and the observation port 9 are sealed and closed by the rubber pad.

The products of jaw crusher 1 and cone crusher 2 in this embodiment are transported to vibrating screen 3 by first belt conveyor 22, and the products on the screen are returned to box 8 through coarse particles to second belt conveyor 23, and are transported by the second belt conveyor. Conveyor 23 is transported to the cone crusher 2 for further crushing, and the under-screen product is transferred from the third belt conveyor to the fourth belt conveyor and enters the powder ore bin for follow-up operations.

During the dust removal process, the internal dust generated by the crushing cavity of the jaw crusher 1, the feed port of the cone crusher 2, and the vibrating screen 3 is sucked into the dust collector 4 by the dust collection cover 11 through the pipe 24, and at the same time the jaw crusher 1 and cone crusher 2 work broken products fall on the belt of the first belt conveyor 22, and the dust raised is also sucked into the dust collector 4 by the dust collection hood 11 through the pipeline 24. The dust with larger particles entering the dust collector 4 will settle into the lower box 20 of the dust collector 4 under the action of its own gravity due to the slowing down of the airflow velocity; the dust with smaller particles will enter the microporous membrane filter material with the airflow, Next, the dust-laden airflow is filtered on the microporous membrane, and the dust is trapped on the microporous membrane, while the filtered clean air is discharged through the upper box body 19 and the air outlet 18. When the dust on the surface of the microporous membrane accumulates to a certain thickness, most of the dust will fall off by its own gravity, and the dust stuck on the microporous membrane will be blown off by the compressed air to the lower box 20, and inside the lower box 20 The dust is all discharged from the sewage outlet 21. Dust falls into the ore collection pool 5 for precipitation, and the upper overflow water of the ore collection pool 5 can enter the reservoir 6 through gravity flow for subsequent slurry making. After the bottom slurry has accumulated to a certain extent, the pump will pump the The production water is sent to the collection pool 5, so that the production water is used to wash and make slurry, and then the slurry flows into the transfer pool 7 through the pipeline 24, and then is pumped to the production system to improve the utilization rate of dust and production water and save resources and production costs.

This embodiment also provides a safe and efficient clean production method for reducing crushing and screening dust, including: the dust generated by the jaw crusher 1, the cone crusher 2 and the vibrating screen 3 is sucked to the micro In the porous film filter dust collector, the crushed products after the jaw crusher 1 and the cone crusher 2 work simultaneously fall on the belt of the first belt conveyor 22, and the dust raised is also sucked into the micropores by the dust collection cover 11 and the pipeline 24 In the membrane filter dust collector; the large particle dust entering the microporous membrane filter dust collector settles into the lower box 20 of the microporous membrane filter dust collector under the action of its own gravity; the small particle dust enters the microporous membrane filter dust collector with the airflow The microporous membrane of the filter, under the action of the pressure difference, the dusty airflow is filtered on the microporous membrane, and the filtered clean air is discharged through the air outlet 18 of the microporous membrane filter dust collector, and the dust is trapped on the microporous membrane. When the dust on the surface of the membrane accumulates to a certain thickness, the dust will fall off to the lower box 20 by its own gravity, and the dust stuck on the microporous membrane will fall off to the lower box 20 by compressed air, and the dust in the lower box 20 will be uniform. It is discharged from the sewage outlet 21 at the bottom of the lower box body 20, and the dust falls into the ore collection pool 5 for precipitation. , the water in the reservoir 6 is transported to the ore collection pool 5 through the pump to wash and make slurry for the pulp, and then the pulp flows into the transfer pool 7 through the pipeline, and then the pulp in the transfer pool 7 is transported to the production system through the pump .

Through process upgrading and transformation, the safe and efficient clean production equipment for reducing crushing and screening dust is in good condition, the dust removal efficiency is increased to 99.5%, the concentration of particulate matter at the discharge port is less than the special discharge limit of 10mg/m ³ , and the discharge of heavy metals is reduced by more than 20%. , to meet the requirements of the government's environmental protection that the concentration of particulate matter at the exhaust outlet of crushing and screening must be lower than the special discharge limit of the "Lead and Zinc Industrial Pollutant Discharge Standard (GB25466-2010) Revised Sheet", and the heavy metal discharge should be 15% lower than before. In addition, all the dust collected in the system re-enters the production system, and 450 tons of raw ore can be recovered each year, which greatly improves the utilization rate of dust and realizes comprehensive utilization of resources while protecting the environment.

The scope of protection of the present invention includes but is not limited to the above embodiments. The scope of protection of the present invention is based on the claims. Any replacement, deformation, and improvement that are easily conceived by those skilled in the art for this technology fall within the scope of the present invention. protected range.

Claims (10)

1. The clean production method for safely and efficiently reducing crushing and screening dust is characterized by comprising the following steps of: dust generated by the work of the jaw crusher, the cone crusher and the vibrating screen is sucked into the dust remover through the dust hood and the pipeline, and meanwhile, crushed products after the work of the jaw crusher and the cone crusher fall onto a belt of the first belt conveyor, and the dust raised by the belt of the first belt conveyor is sucked into the dust remover through the dust hood and the pipeline; the dust entering the dust remover is settled under the action of self gravity and falls into the ore collecting pool from the sewage outlet of the dust remover; the upper overflow water of the ore collecting pond automatically flows into the water reservoir, after the ore pulp at the bottom of the ore collecting pond is accumulated, the water in the water reservoir is conveyed into the ore collecting pond so as to flush and make pulp, and then the pulp automatically flows into the intermediate transfer pond, and the pulp in the intermediate transfer pond is conveyed to a production system.

2. The clean production method for safely and efficiently reducing broken and screened dust according to claim 1, wherein the dust remover is a microporous membrane filter dust remover, and large-particle dust entering the microporous membrane filter dust remover is settled into a lower box body of the microporous membrane filter dust remover under the action of self gravity; the dust of granule gets into microporous membrane filter dust remover's microporous membrane along with the air current, under the pressure differential effect, the dust-laden air current filters on the microporous membrane, the air that filters clean is discharged through the air outlet of microporous membrane filter dust remover, the dust is held back on the microporous membrane, when the dust on microporous membrane surface gathers to certain thickness, the dust drops to the lower box by self gravity effect, the dust that glues on the microporous membrane drops to the lower box by compressed air jetting, the dust is all discharged from the drain of lower box bottom in the lower box, the dust falls into the sedimentation in the collection basin, the upper overflow water in collection basin is through flowing into the cistern, thereby the water in the collection basin is carried to the collection basin through the pump after the pulp accumulates to certain thickness, thereby wash and make thick liquid to the ore pulp, then the ore pulp flows into the transfer basin through the pipeline, the ore pulp in the transfer basin is carried to production system through the pump again.

3. The clean production method for safely and efficiently reducing crushing and screening dust according to claim 1, wherein a discharge port of the jaw crusher is communicated with a feed port of a vibrating screen through a first belt conveyor, a coarse particle discharge port of the vibrating screen is communicated with a feed port of a cone crusher through a second belt conveyor, and a discharge port of the cone crusher is communicated with the feed port of the vibrating screen through the first belt conveyor.

4. The clean production method for safely and efficiently reducing crushing and screening dust according to claim 1, wherein a dust hood is communicated with a crushing cavity shell of the jaw crusher, a dust hood is communicated with a discharge port of the jaw crusher, and the dust hood at the discharge port of the jaw crusher is covered on a belt of a first belt conveyor.

5. The clean production method for safely and efficiently reducing crushing and screening dust according to claim 4, wherein a dust hood is arranged above a feed inlet of the cone crusher, a dust hood is communicated with a discharge outlet of the cone crusher, and the dust hood at the discharge outlet of the cone crusher is covered on a belt of the first belt conveyor.

6. The clean production method for safely and efficiently reducing crushed and screened dust according to claim 5, which is characterized by comprising the following steps of: the cone crusher is characterized in that a closed box body is arranged around a feed inlet of the cone crusher and is communicated with the dust hood in a sealing mode, an observation opening is further formed in the closed box body, rubber pads are arranged around the observation opening, a cover plate is hinged to the observation opening through a hinge, and the cover plate is sealed with the rubber pads in a sealing mode.

7. The clean production method for safely and efficiently reducing crushed and screened dust according to claim 5, which is characterized by comprising the following steps of: the suction hood with the jaw crusher discharge port in sealing communication is of an integrated structure with the suction hood with the cone crusher discharge port in sealing communication, and the integrated structure is in sealing sliding connection with a belt on the first belt conveyor through a belt edge skin.

8. The clean production method for safely and efficiently reducing crushed and screened dust according to claim 5, which is characterized by comprising the following steps of: the angle between the dust hood and the discharge hole dripping groove of the jaw crusher is 50-70 degrees, and the angle between the dust hood and the discharge hole dripping groove of the cone crusher is 50-70 degrees.

9. The clean production method for safely and efficiently reducing crushing and screening dust according to claim 1, which is characterized by comprising the following steps of: the vibrating screen is a totally-enclosed vibrating screen, and the totally-enclosed vibrating screen of the vibrating screen is communicated with a dust hood in a sealing way.

10. The clean production method for safely and efficiently reducing crushing and screening dust according to claim 1, which is characterized by comprising the following steps of: the bottom of the ore collecting tank has a certain inclination angle with the horizontal plane, and the bottom discharge port of the ore collecting tank has a height difference with the feeding port of the transfer tank, so that ore pulp automatically flows into the transfer tank through a pipeline, and a filter screen is arranged at the lower end of the feeding port of the transfer tank.

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