CN105771494B - Towards the water circulation automatic dust removing method and device of Wood-based Panel Production - Google Patents

Abstract

The invention discloses a water circulation automatic dust removal method and device for artificial board production in the dust removal technology. The dust is settled into the flocculation buffer pool by the simplest spraying method, and the water filtered by a purified water tank after flocculation and sedimentation can be recycled for use in Spraying, the purified water tank also has the function of backwashing. When the dirt accumulated at the bottom of the tank reaches a certain value, the controller opens the water valve at the bottom of the tank, and the powerful water above the tank will return the dirt below. Rinse clean, and coarsely filter the backwash sewage through a solid-liquid separator, while the remaining sewage can be discharged into the flocculation buffer pool for circulation and filtration for reuse. The controller is fully automatic control, which can handle dust with large capacity and high efficiency, and separate solid and liquid The sewage that comes out is sent back to the flocculation sedimentation tank for re-filtering and recycling to avoid waste of water resources and secondary pollution of the environment. It has a circular purification function and realizes zero discharge of sewage.

Description

Water cycle automatic dust removal method and device for wood-based panel production

technical field

The invention relates to a dust removal technology, in particular to an automatic dust removal device and a dust removal method for removing dust from wood-based panels.

Background technique

Commonly used dust removal devices in the industry include wet dust removal devices, electrostatic dust removal devices, and cyclone dust removal devices. There has always been a problem of environmental pollution in the production of wood-based panels. The particles produced in the exhaust gas of wood-based panels are basically wood dust. Wood dust has large particles, no chemical reaction, a large flow rate, and is easy to separate and collect. Therefore, cyclone separators and bag dust collectors are generally used. container for recycling. Although this type of device is convenient for dust removal and has relatively high efficiency, there are actually many problems such as the exhaust gas cannot meet the standard, the filter bag is easy to clog, the energy utilization rate is not high, and the working conditions of the workers are poor. Ordinary wet dedusting devices also have some problems. The biggest problem is that the sewage from dust treatment is not recycled, resulting in a large amount of waste of water resources and secondary pollution to the environment.

Contents of the invention

The purpose of the present invention is to provide a practical, simple, environmentally friendly, low-cost, high-efficiency water circulation automatic dust removal method and device for wood-based panel production, based on water recycling and automatic control, to achieve an ideal dust removal effect.

In order to achieve the above purpose, the technical scheme adopted by the present invention for the water circulation automatic dedusting device for wood-based panel production is as follows: it includes a water purification buffer pool, the upper part of the water purification buffer pool is connected to the tap water inlet through the water inlet pipe, and the tap water control electric valve is provided on the water inlet pipe , the water purification buffer pool is equipped with a water purification tank level gauge, one side of the water purification buffer pool is connected to the spray nozzle through the first water pipe, the spray nozzle is set above the interior of the spray tower dust collector, and the top of the spray tower dust collector is provided with an air outlet, There is a slag outlet at the bottom, an air inlet under the side wall of the spray tower dust collector, and a clean water pump and an air compressor on the first water pipe; the slag outlet is connected to the flocculation buffer tank through the second water pipe, and the inside of the flocculation buffer tank Equipped with a flocculation tank liquid level gauge, the bottom is connected to the purified water tank through the third water pipe, and the flocculation water control electric valve, flocculation water pump and pressure sensor are installed on the third water pipe, and the upper end of the flocculation buffer tank is connected to the flocculant feed port through the fourth water pipe , the fourth water pipe is equipped with a flocculant control electric valve; the bottom of the purified water tank is connected to the backwash sewage tank through the backwash drain pipe, and the backwash sewage control electric valve is installed on the backwash drain pipe; the backwash sewage tank is equipped with a sewage pool Liquid level gauge, the upper end of the backwash sewage tank is connected to one end of the sewage pump through the fifth water pipe, and the other end of the sewage pump is connected to the water spray port. The terrain of the purified water tank is higher than that of the purified water buffer tank, and the side and top of the purified water tank are connected through the drain pipe The water purification buffer pool; the solid-liquid separator includes a box, the upper part of the side wall of the box is a downward-sloping filter screen, and the filter screen is facing the water spray port; the side of the lower part of the filter screen is a downward-sloping connection The water pan and the backwash sewage tank are connected to the lower end of the water receiving pan through the sixth water pipe; the side wall of the flocculation buffer tank is connected to the solid-liquid separator through the seventh water pipe, and the terrain of the solid-liquid separator is higher than that of the flocculation buffer pool; Pool level gauge, flocculation tank level gauge, sewage tank level gauge, pressure sensor, clean water pump, sewage pump5, flocculation water pump, air compressor, flocculation water control electric valve, flocculant control electric valve, tap water control electric valve The valve and the backwash sewage control electric valve are respectively connected to the controller through different ports.

The technical scheme adopted by the water cycle automatic dedusting method for the production of wood-based panels in the present invention comprises the following steps:

A. The controller turns on the water purification pump, air compressor and flocculant electric control valve. The water purification pump pumps the water in the water purification buffer tank to the spray nozzle. The wood-based panel dust enters the spray tower dust collector from the air inlet and is sprayed by the spray nozzle Settling, the purified gas is discharged from the air outlet;

B. The controller collects the water level value of the liquid level gauge in the flocculation tank. If the water level detected by the liquid level gauge in the flocculation tank does not reach the required value, the controller controls the flocculation water control electric valve to close, the flocculation water pump stops working, and the purification tank stops purifying Sewage; otherwise, open the flocculation water control electric valve, turn on the flocculation water pump, and the flocculation water pump will send the sewage in the flocculation buffer tank to the purified water tank;

C. The controller collects the pressure value of the pressure sensor. If the pressure does not reach the preset threshold value of the controller, the backwash sewage control electric valve is closed to make the purified water tank purify the sewage; otherwise, the flocculation water control electric valve is closed and the backwash is opened. The sewage control valve closes the flocculation pump, and the purified water tank stops purifying for backwashing;

D. The controller collects the water level value measured by the liquid level gauge of the sewage tank in the backwashing sewage tank. If the water level value is lower than the preset threshold, the sewage pump is turned off, otherwise, the sewage pump is turned on.

Compared with the prior art, the present invention has the following advantages:

1. The cost of the device in the present invention is low. The water purification tank uses extremely cheap materials such as stones, pebbles and fine sand to form a filter layer, which greatly reduces the cost of the entire water purification system.

2. The dust removal method in the present invention has a high degree of automation. The whole system is fully automatic controlled by the controller, and all parts can coordinate and work in a reasonable and orderly manner without personnel monitoring.

3. The present invention realizes zero discharge of sewage. The device has the function of circulation and purification, and the sewage separated from solid and liquid is sent back to the flocculation sedimentation tank for re-filtering and recycling, which can avoid the waste of water resources and the secondary pollution of the environment.

4. The device of the present invention has a good filtering effect. The purified water tank adopts the reverse osmosis principle of water from below to achieve a good filtering effect.

5. The present invention has high cleaning efficiency and energy saving. The potential energy of the water in the purified water tank is used to realize backwashing, and the purpose of efficiently cleaning up dirt and saving energy is achieved.

6. The solid-liquid separator in the present invention has simple equipment and high efficiency. The novel solid-liquid separator device is simple and can quickly separate and collect the residue of backwash sewage.

Description of drawings

Fig. 1 is the structural representation of the water circulation automatic dedusting device of the present invention facing the production of wood-based panels;

Figure 2 is the internal structure and external connection diagram of the controller;

Fig. 3 is a flow chart of the automatic dedusting method of the water circulation automatic dedusting device for wood-based panel production according to the present invention.

In the figure: 1. Air inlet; 2. Spray nozzle; 3. Air outlet; 4. Spray tower dust collector; 9. Dirt collection brush; 10. Filter screen; 11. Water tray; 12. Sludge sedimentation tank; 13. Backwash sewage tank; 14. Ground; 15. Backwash drain pipe; 16. Tower; 17. Support frame; 18. clapboard; 19. stone layer; 20. gravel layer; 21. fine sand layer; 22. water outlet; 23. clean water buffer pool; 24. baffle; .Water nozzle; 27. Steering gear; 28. Support leg; 29. Air compressor; 30. Controller;

A01. Electric valve for flocculation water control; A04. Electric valve for backwash sewage control; A06. Electric valve for tap water control; A09. Electric valve for flocculant control;

A02. Flocculation pump; A05. Sewage pump; A07. Clean water pump;

A03. Pressure sensor; A08. Water level gauge in clean water tank; A10. Sewage tank level gauge; A11. Flocculation tank level gauge;

B01～B11. Water inlet and outlet pipes; B12. Water inlet pipes; B13. Ring water pipes;

D01～D04. Input interface circuit; C01～C09. Interface drive circuit.

detailed description

Referring to Fig. 1 and Fig. 2, the water circulation automatic dedusting device for wood-based panel production of the present invention is mainly composed of a wet dedusting system, a water purification system and a solid-liquid separation system. Among them, the wet dust removal system is composed of water inlet device and spray tower dust collector 4, the water purification system is composed of flocculation buffer tank 7 and purified water tank 6, and the solid-liquid separation system is composed of solid-liquid separator 8, backwash sewage tank 13, etc. composition.

The water inlet device of the wet dust removal system consists of a clean water buffer tank 23, a clean water tank liquid level gauge A08, a tap water control electric valve A06, a self-boiling water port 22, a clean water pump A07, and an air compressor 29. The water purification buffer pool 23 is a cement pool with an upper end opening. The upper end of the water purification buffer pool 23 is connected with a water inlet pipe B12. In Fig. 2, the tap water control electric valve A06 is connected to the controller 30 in Fig. 2 through the control line, and the tap water control electric valve A06 is controlled to be opened by the controller 30, thereby controlling whether the self-boiling water port 22 replenishes water into the clean water buffer pool 23. One side of the water purification buffer pool 23 is connected to the water pipe B10, and the water purification buffer pool 23 is connected to the spray tower dust collector 4 through the water pipe B10. The clean water pump A07 and the air compressor 29 are installed on the water pipe B10, and the other end of the air compressor 29 is connected to the water pipe B06 installed in the spray tower deduster 4. Referring to Fig. 2, the clean water pump A07 and the air compressor 29 are respectively connected to the controller 30, and the controller 30 controls the work of the clean water pump A07 to extract the water in the clean water buffer pool 23, and the air compressor 29 adds compressed air into the water and sends it into the spray Tower dust collector 4 is used for spraying.

The water purification buffer tank 23 is equipped with a water purification tank level gauge A08, see Figure 2, the water purification tank level gauge A08 is connected to the controller 30 through a signal line, and the water purification tank level gauge A08 is used to sense the water purification buffer tank The water level in 23 can transmit the sensed water level signal to the controller 30, and the controller 30 adjusts the running water control electric valve A06 to ensure that the water purification buffer pool 23 reaches the set water level. Neither allow the water in the clean water buffer tank 23 to overflow too much, nor allow the clean water pump A07 to drain the water in the clean water buffer tank 23, causing the water pump to dry out or even damage the equipment.

The spray dedusting tower 4 in the wet dedusting system is composed of an air inlet 1, an air outlet 3, a slag discharge outlet 5, and a spray nozzle 2. The spray dust removal tower 4 is a tank structure, the middle section of the spray dust removal tower 4 is a hollow cylinder, the upper and lower ends of the cylinder are respectively welded with hollow round tables, and the top opening of the spray dust removal tower 4 is an air outlet 3 for The purified gas is discharged, and the bottom opening of the spray dedusting tower 4 is a slag discharge port 5, which is used to discharge sewage entrained with wood-based panel dust. There is an air inlet 1 under the side wall of the spray dedusting tower 4, and a round hole is opened above the side wall of the spray dedusting tower 4 for welding the water pipe B06, one end of the water pipe B06 is connected to the water pipe B10, and the other end of the water pipe B06 is connected to For the branch water pipe inside the dedusting tower 4, the other end of the water pipe B06 is connected to three branch water pipes extending downward. On the three equal points of water pipe B13. A plurality of spray nozzles 2 are evenly installed along the circumferential direction on the circular water pipe B13, and the number of spray nozzles 2 is at least 3 (only 5 spray nozzles 2 are shown in Figure 1), which is conducive to stabilizing the water pressure in the water pipe and increasing the spray amount of shower. A plurality of spray nozzles 2 are above the interior of the spray tower dust collector 4 , and the height of the plurality of spray nozzles 2 is higher than the air inlet 1 and above the air inlet 1 . Because the particle size of wood-based panel dust is large and easily soluble in water, multiple spray nozzles 2 can fully dissolve the wood-based panel dust in the water droplets and settle to the bottom of the spray dedusting tower 4, so that the purified gas discharged from the air outlet 3 can meet the standard .

The flocculation buffer tank 7 in the water purification system is composed of a flocculant control electric valve A09, a flocculant feed port 25, a flocculation tank liquid level gauge A11 and the like. The flocculation buffer tank 7 is a cement tank with an open top, and its volume is relatively large. The top of the flocculation buffer tank 7 is connected with a water pipe B02, and the slag outlet 5 at the bottom of the spray dedusting tower 4 is connected to the flocculation buffer tank 7 through the water pipe B02, so that the sewage that is sprayed and settled in the spray dedusting tower 4 and entrained with wood-based panel dust is discharged. In the flocculation and sedimentation tank 7, the sewage is flocculated and settled and waits for the next step of purification. The bottom of the flocculation buffer tank 7 has a round hole for welding the water pipe B04, the bottom of the flocculation buffer tank 7 is connected to the purified water tank 6 through the water pipe B04, and the flocculation water control electric valve A01, the flocculation water pump A02 and the pressure sensor A03 are installed on the water pipe B04 , referring to Fig. 2 again, the flocculation water control electric valve A01, the flocculation water pump A02 and the pressure sensor A03 are respectively connected to the controller 30, the flocculation water pump A02 is used to pump the water in the flocculation buffer tank 7 to the purified water tank 6, and the flocculation water control motor The valve A01 controls the on-off of the water pipe, and the pressure sensor A03 is used to detect the water pressure inside the purified water tank 6 . The upper end of the flocculation buffer tank 7 is also connected with a water pipe B11, and the other end of the water pipe B11 is connected with the flocculant feed port 25, and the water pipe B11 is equipped with a flocculant control electric valve A09. Referring to FIG. 2 , the flocculant control electric valve A09 is connected to the controller 30 through a control line. The flocculant enters the flocculation buffer pool 7 from the flocculant feed port 25, and the flocculant feed port 25 is similar to a funnel that controls the size of the opening with the flocculant control electric valve A09. When starting to work, the controller 30 opens the flocculant control electric valve A09, and injects the flocculant according to a certain proportion, which is an experimental value obtained according to the degree of flocculation of water. Wood-based panel dust is easy to float on the surface of water and is relatively small. If it is directly filtered by the filter layer, the filtering effect will not only be poor, but also the entire equipment will be blocked. Therefore, it is necessary to flocculate the wood-based panel dust into large flocculent coagulation sediments. Considering that the wood-based panel dust will not undergo chemical reaction and the operation cost of the whole set of equipment, it is only necessary to add flocculant to the flocculation buffer pool 7 to achieve the desired effect.

A flocculation tank liquid level gauge A11 is installed at a certain height inside the flocculation buffer tank 7, as shown in FIG. The flocculation tank level gauge A11 can transmit the sensed water level signal to the controller 30, and the controller 30 adjusts the flocculation water to control the electric valve A01, so that the water level in the flocculation buffer tank 7 reaches a constant value. Neither too much water in the flocculation buffer tank 7 will overflow nor too little water in the pool will cause the flocculation pump A02 to dry out. The most important thing is to have sufficient time margin to make the wood-based panel dust and flocculant The reaction takes place sufficiently to form flocculent coagulation precipitates.

A water pipe B01 is connected to a side wall of the flocculation buffer tank 7, and the flocculation buffer tank 7 is connected to the solid-liquid separator 8 through the water pipe B01.

The purified water tank 6 in the water purification system is a closed cylindrical box structure, and a support plate 17, a dividing plate 18, a stone layer 19, a gravel layer 20, and a fine sand layer 21 are installed inside. The bottom of the purified water tank 6 sides has a round hole for welding the water pipe B03, and the water pipe B03 is connected to the water pipe B04.

The bottom of the purified water tank 6 has a round hole for welding the backwash drain pipe 15, the bottom of the purified water tank 6 is connected to the backwash sewage pool 13 through the backwash drain pipe 15, and the backwash sewage control is installed on the backwash drain pipe 15. The electric valve A04 is shown in FIG. 2 . The backwash sewage control electric valve A04 is connected to the controller 30 through a control line. There is a round hole on the top of the backwash sewage tank 13 for welding the water pipe B08, and the water pipe B08 is connected to the backwash drain pipe 15. The backwash sewage control electric valve A04 controls the on-off of the backwash drainage pipe 15, the backwash drainage pipe 15 needs to be closed when the purified water tank 6 purifies the sewage, and the backwash sewage control electric valve needs to be opened when the purified water tank 6 needs backflush. Valve A04, the backwash sewage is discharged into the backwash sewage tank 13 through the backwash drain pipe 15.

The inner bottom of the purified water tank 6 is fixedly placed with a support plate 17. The structure of the support plate 17 is similar to a round table with four legs. . On the support plate 17, a dividing plate 18, a stone layer 19, a gravel layer 20, and a fine sand layer 21 are placed successively from bottom to top; The outer diameter of the circular thin metal plate is equal to the outer diameter of the support plate 17 . The upper surface of the dividing plate 18 is first paved with stones of a certain thickness to form a stone layer 19, then paved with stones of the same thickness to form a stone layer 20, and finally covered with fine sand of the same thickness to form a fine sand layer 21, the order of stacking is According to the principle of stone coarse filtration step by step to sand fine filtration.

Purified water tank 6 side tops have round holes for welding drainpipe B09, and the other end of drainpipe B09 is connected to clean water buffer pool 23, and clean water buffer pool 23 is connected to purified water tank 6 through drainpipe B09. The volume of the purified water tank 6 is much smaller than that of the purified water buffer tank 23 . The purified water tank 6 is mounted on a tower 16 of a certain height, and the tower 16 can increase the potential energy of the water in the purified water tank 6, so that the bottom of the purified water tank 6 is higher than the top of the purified water buffer pool 23, that is, the purified water tank The overall terrain of 6 is high, and the clean water buffer pool 23 is low in terrain, and the purified water tank 6 utilizes the advantage of the high terrain to directly flow the filtered clean water into the clean water buffer pool 23 in the low terrain.

After the flocculation pump A02 is turned on, the sewage in the flocculation buffer tank 7 is continuously pumped into the purified water tank 6, and the water level of the sewage under the clapboard 18 in the purified water tank 6 is continuously increased, and the sewage passes through the stone layer 19, the stone layer 20, the fine sand Layer 21 is reverse osmosis filtration layer by layer, and now the water above the fine sand layer 21 has been completely purified. After the water level reaches the position of the drainage pipe B09, the purified water flows into the clean water buffer pool 23 through the drainage pipe B09. The filter layer composed of stone layer 19, gravel layer 20 and fine sand layer 21 can not only reduce the cost of the whole equipment, but also can filter sewage with large capacity and high efficiency. After a period of time, more and more dirt accumulates under the partition 18. When the pressure value detected by the pressure sensor A03 reaches the threshold, the flocculation water control electric valve A01 and the flocculation water pump A02 are closed, and the backwash sewage control valve A04 is opened. The huge water above the partition 18 quickly backwashes the accumulated dirt below the partition 18, and the backwashed sewage flows into the low-lying backwash sewage tank 13 through the backwash drain pipe 15 and the water pipe B08. Therefore, the pressure sensor A03 on the water pipe B04 in the present invention can transmit the sensed water pressure signal to the controller 30, and then the controller 30 adjusts the flocculation water control electric valve A01, the backwash sewage control electric valve A04, and the flocculation water pump A02, the purified water tank 6 can automatically complete purification and backwashing. When there is too much dirt accumulated under the partition 18 and the filtering effect is not good, that is, when the water pressure reaches the threshold value, the controller 30 can control the purified water tank 6 to stop purifying and perform backwashing, so that the purified water tank 6 will still remain in the next cycle. Keep your filtration at its best.

The solid-liquid separator 8 in the solid-liquid separation system is composed of a filter screen 10, a baffle plate 24, a steering gear 27, a dirt collection brush 9, a water receiving tray 11, and the like. The backwash sewage tank 13 in the solid-liquid separation system is a cement tank with an open upper end, and two water pipes are connected to the upper end of it, which are water pipe B07 and water pipe B08 respectively. Water pipe B08 and backwash drainpipe 15 form an integral body to connect purified water tank 3, water pipe B07 connects one end of sewage pump A05, and the other connection of sewage pump A05 is water spray port 26, and water spray port 26 faces filter screen 10. Referring to FIG. 2 , the sewage pump A05 is connected to the controller 30 via a control line. The ultra-high-power sewage pump A05 pumps the sewage to be separated from solid and liquid to the water spray port 26 through the water pipe B07, and then fully sprays it onto the downwardly inclined filter screen 10. The backwash sewage tank 13 has a round hole on the side close to the solid-liquid separator 8 for welding the water pipe B05. The backwash sewage tank 13 is connected to the water receiving tray 11 through the water pipe B05. The water receiving tray 11 is placed obliquely to receive water. The top of the pan 11 is located at the side below the filter screen 10, and the lower end of the water receiving pan 11 is connected to the backwash sewage tank 13 through the water pipe B05.

A sewage tank level gauge A10 is installed inside the backwashing sewage tank 13 , as shown in FIG. 2 , the sewage tank level gauge A10 is connected to the controller 30 via a signal line. The sewage tank liquid level gauge A10 is used to sense the water level in the backwash sewage tank 13, and can transmit the sensed water level signal to the controller 30, and then the controller 30 adjusts the sewage pump A05 to ensure that the volume in the backwash sewage tank 13 reaches the set value. The fixed water level will neither allow the water in the backwash sewage tank 13 to overflow too much, nor allow the sewage pump A05 to dry out and cause equipment damage.

The main body of the solid-liquid separator 8 is a box structure in which the upper part of the side wall is an inclined screen 10, and the screen 10 is a metal gauze with holes on it, which can be used as the upper part of the side wall of the box. Metal dense gauze is stitched on the frame. The filter screen 10 is welded on the casing of the solid-liquid separator 8, and the lower bottom edge of the filter screen 10 is welded with a baffle plate of a certain height, which can prevent the water in the solid-liquid separator 8 from flow out. After the sewage in the backwash sewage tank 13 passes through the filter screen 10, the large floc therein adheres to the filter screen 10 rapidly, and the coarsely filtered liquid will flow into the casing of the solid-liquid separator 8 through the filter screen 10, Thereby the separation of solid and liquid is achieved.

Baffle plates 24 are respectively welded on both side edges of the filter screen 10 , and the up and down lengths of the baffle plates 24 are equal to the up and down lengths of the filter screen 10 and are perpendicular to the filter screen 10 . Steering gear 27 and dirt collection brush 9 are arranged on the baffle plate 24, dirt collection brush 9 is controlled by steering gear 27, and the length of dirt collection brush 9 is approximately equal to filter screen 10 widths. Referring to Fig. 2, the steering gear 27 is connected to the controller 30 by a control line. If the controller 30 turns on the steering gear 27, the dirt collecting brush 9 will go back and forth with the lower end of the dirt collecting brush 9 as the center of the circle driven by the steering gear 27 every once in a while. Rotate 90 degrees once to clean the filter screen 10 to prevent the filter screen 10 from being blocked by too much dirt adsorbed on the filter screen 10 .

The water receiving tray 11 is a box-shaped body that is placed obliquely and has an open upper end. The upper end of the water receiving tray 11 is welded on the baffle plate 24 . However, there must be a certain gap between the water receiving tray 11 and the filter screen 10, which is about the width of the dirt collection brush 9. When the dirt collection brush 9 rotates, the scraped dirt can fall into the sludge below through the gap. In the sedimentation tank 12, the water sprayed from the water spray port 26 will only have a small part of the water falling into the sludge sedimentation tank 12 through the gap. Place sludge settling tank 12 below filter screen 10, make sludge settling tank 12 directly below the slit, sludge settling tank 12 is a cement pool with an upper end opening, for accepting the dirt collected by dirt brush 9.

Two supporting legs 28 are welded on the bottom of the lower end of the water receiving tray 11 for supporting the water receiving tray 11 and making it have a certain slope. The lower end of the water receiving tray 11 has a round hole for welding the water pipe B05, and the water pipe B05 is connected to the backwash sewage tank 13. When strong water is sprayed onto the filter screen 10, part of it will bounce back, and the water receiving tray 11 collects this part of water, and flows into the backwashing sewage tank 13 through the drain pipe B05 along the slope, collects and separates the solid and liquid again.

The bottom of the solid-liquid separator 8 is higher than the top of the flocculation buffer tank 7, the solid-liquid separator 8 is on a high terrain, and the flocculation buffer tank 7 is on a low terrain. There is a round hole at the bottom of the solid-liquid separator 8 for welding the water pipe B01, and the other end of the water pipe B01 is connected to the flocculation buffer tank 7, and the coarsely filtered water in the solid-liquid separator 8 on a high terrain flows into the flocculation through the drain pipe B01 In the buffer pool 7, the problem of circulating water utilization is solved.

Referring to FIG. 2 , the controller 30 is composed of a single-chip microcomputer, multiple interface driving circuits and multiple input interface circuits, and each interface driving circuit and input interface circuit are respectively connected to the single-chip microcomputer through different ports. : the single-chip microcomputer model is STM32, and the single-chip microcomputer is connected with the corresponding controlled parts in Fig. 1 through a plurality of interface drive circuits, and is also connected with the corresponding detection parts in Fig. 1 through a plurality of input interface circuits respectively. Specifically: the single-chip microcomputer is respectively connected to the pressure sensor A03 through the input interface circuit D01, connected to the water level gauge A08 through the input interface circuit D02, connected to the sewage tank level gauge A10 through the input interface circuit D03, and connected to the flocculation tank through the input interface circuit D04 Level gauge A11. The single-chip microcomputer is also connected to the flocculation water pump A02 via the interface drive circuit C01, the sewage pump A05 via the interface drive circuit C02, the clean water pump A07 via the interface drive circuit C03, the flocculation water control electric valve A01 via the interface drive circuit C04, and the flocculation water control electric valve A01 via the interface drive circuit C05 is connected to the backwash sewage control electric valve A04, connected to the tap water control electric valve A06 through the interface drive circuit C06, connected to the flocculant control electric valve A09 through the interface drive circuit C07, connected to the steering gear 27 through the interface drive circuit C08, and connected to the interface drive circuit C09 Connect the air compressor 29.

Referring to the flow chart in FIG. 3 , the controller 30 will cycle sequentially and continuously inquire about the liquid level gauge A08 of the clean water tank, the level gauge of the flocculation tank A11 , the pressure sensor A03 , and the level gauge of the sewage tank A10 , and then issue corresponding instructions. The dust is settled into the flocculation buffer pool 7 by the simplest spraying method, and the water filtered by the purified water tank 6 after flocculation and precipitation can also be recycled for spraying. The purified water tank 6 also has the function of backwashing. When the dirt accumulated at the bottom of the tank reaches a certain value, the controller 30 opens the water valve at the bottom of the tank, and the powerful water above the tank backwashes the dirt below. clean. Then the backwash sewage is coarsely filtered through the solid-liquid separator, and the remaining sewage can be discharged into the flocculation buffer pool 7 for circulation and filtration for reuse. Among them, using the controller 30 to allocate work reasonably can process dust with a large capacity and high efficiency. details as follows:

When starting to work, the controller 30 opens the clean water pump A07, the air compressor 29 and the flocculant electric control valve A09, and the clean water pump A07 pumps the water in the clean water buffer pool 23 to the spray nozzle 2 through the water pipe B10, and the wood-based panel dust flows from the inlet The tuyere 1 enters the bottom of the spray tower dust collector 4 and is sprayed and settled by a plurality of spray nozzles 2, and the purified gas is discharged from the air outlet 3. The water in the clean water buffer pool 23 is constantly pumped away by the clean water pump A07, and the purified water in the purified water tank 6 will be replenished into the clean water buffer pool 23 through the water inlet pipe B09. In order to make the water level in the clean water buffer pool 23 reach A constant value needs to continuously collect the water level value measured by the water purification tank liquid level gauge A08 in the water purification buffer tank 23. If the water level does not reach the required value, then open the tap water control electric valve A06, and replenish water from the tap water port 22 to the clean water buffer pool 23. On the contrary, if the water level reaches the required value, then close the tap water control electric valve A06 to stop replenishing water. After the controller 30 reads the liquid level gauge A08 of the clean water tank, it jumps to read the liquid level gauge A11 of the flocculation tank. Next, the controller 30 collects the water level value of the flocculation tank level gauge A11 in the flocculation buffer tank 7. If the water level detected by the flocculation tank level gauge A11 does not reach the required value, the controller 30 controls the flocculation water to control the electric valve A01 Close, the flocculation pump A02 stops working, and the purified water tank 6 stops purifying sewage, so that a certain period of time can be left so that the flocculant can fully flocculate the wood-based panel dust in the flocculation buffer tank 7 into pieces. If the water level detected by the flocculation tank liquid level meter A11 reaches the required value, the flocculation water control electric valve A01 is opened, the flocculation water pump A02 is turned on, and the flocculation water pump A02 sends the sewage in the flocculation buffer tank 7 to the purified water tank 6 under pressure. After the controller 30 reads the level gauge A11 of the flocculation tank, it jumps to read the pressure sensor A03. Then, the controller 30 collects the pressure value of the pressure sensor A03. If the pressure does not reach the preset threshold value of the controller 30, the backwash sewage control electric valve A04 is closed, so that the purified water tank 6 keeps purifying sewage. Conversely, if the pressure value reaches the preset threshold, the flocculation water control electric valve A01 is closed, the backwash sewage control valve A04 is opened, the flocculation water pump A02 is closed, and the purified water tank 6 stops purifying for backwashing. After the controller 30 reads the pressure sensor A03, it jumps to read the sewage tank level gauge A10. Finally, the controller 30 collects the water level value measured by the sewage tank liquid level gauge A10 in the backwash sewage tank 13. If the water level is low to the bottom and the water level value is lower than the preset threshold value, the sewage pump A05 stops working, and the steering gear 27 is turned off. The solid-liquid separation device stopped working. Conversely, if the water level is higher than the preset threshold and the water level is not lowered to the bottom, the sewage pump A05 is turned on, the steering gear 27 works, and the solid-liquid separation device starts to work. After the controller 30 reads the liquid level gauge A10 of the sewage tank, it then recirculates and jumps to read the liquid level gauge A08 of the clean water tank.

Claims (7)

1. A water cycle automatic dust removal device for wood-based panel production, including a water purification buffer pool (23), the upper part of the water purification buffer pool (23) is connected to the water inlet (22) through the water inlet pipe (B12), and the upper part of the water inlet pipe (B12) Equipped with tap water control electric valve (A06), its feature is: the water purification buffer tank (23) is equipped with a water purification tank liquid level gauge (A08), and one side of the water purification buffer tank (23) passes through the first water pipe (B10) Connect the spray nozzle (2), the spray nozzle (2) is set above the interior of the spray tower dust collector (4), the top of the spray tower dust collector (4) is provided with an air outlet (3), and the bottom is provided with a slag outlet (5), An air inlet (1) is provided under the side wall of the spray tower dust collector (4), and a clean water pump (A07) and an air compressor (29) are provided on the first water pipe (B10); The second water pipe (B02) is connected to the flocculation buffer tank (7), and the flocculation tank level gauge (A11) is installed inside the flocculation buffer tank (7), and the bottom is connected to the purified water tank (6) through the third water pipe (B04). The water pipe (B04) is equipped with a flocculation water control electric valve (A01), a flocculation water pump (A02) and a pressure sensor (A03), and the upper end of the flocculation buffer tank (7) is connected to the flocculant feed port (25) through the fourth water pipe (B11) , the fourth water pipe (B11) is equipped with a flocculant control electric valve (A09); the bottom of the purified water tank (6) is connected to the backwash sewage tank (13) through the backwash drain pipe (15), and the backwash drain pipe (15) The backwash sewage control electric valve (A04) is installed on the top; the backwash sewage tank (13) is equipped with a sewage tank liquid level gauge (A10), and the upper end of the backwash sewage tank (13) is connected to the sewage pump ( One end of A05), the other end of the sewage pump (A05) is connected to the water spray port (26), the terrain of the purified water tank (6) is higher than that of the purified water buffer pool (23), and the top of the side of the purified water tank (6) passes through the drain pipe (B09) is connected to the water purification buffer tank (23); the solid-liquid separator (8) includes a box body, and the upper part of the side wall of the box body is a filter screen (10) inclined downward, and the filter screen (10) is facing the The water spray port (26) mentioned above; the side of the lower part of the filter screen (10) is a downwardly inclined water tray (11), and the backwash sewage tank (13) is connected to the lower end of the water tray (11) through the sixth water pipe (B05) The side wall of the flocculation buffer tank (7) is connected to the solid-liquid separator (8) through the seventh water pipe (B01), and the terrain of the solid-liquid separator (8) is higher than that of the flocculation buffer tank (7); Tank level gauge (A08), flocculation tank level gauge (A11), sewage tank level gauge (A10), pressure sensor (A03), clean water pump (A07), sewage pump (A05), flocculation water pump (A02), The air compressor (29), flocculation water control electric valve (A01), flocculant control electric valve (A09), tap water control electric valve (A06) and backwash sewage control electric valve (A04) are respectively connected to the controller through different ports (30). 2. According to claim 1, the water cycle automatic dust removal device for wood-based panel production is characterized in that: there is a gap between the upper part of the water receiving tray (11) and the filter screen (10), and the sludge sedimentation tank is directly below the gap ( 12); baffles (24) are respectively installed on both side edges of the filter screen (10), steering gears (27) and dirt collection brushes (9) are arranged on the baffles (24), and the dirt collection brushes (9) are connected to the rudder machine (27), the steering gear (27) is connected to the controller (30). 3. The water cycle automatic dedusting device for wood-based panel production according to claim 1, characterized in that: one end of the eighth water pipe (B06) is connected to the first water pipe (B10), and the other end of the eighth water pipe (B06) is connected to the spray There are three branch water pipes extending downward inside the tower dust collector (4), and the three branch water pipes are connected to the ring water pipe (B13) below, and the ring water pipe (B13) is evenly equipped with multiple spray nozzles (2) along the circumferential direction . 4. According to claim 1, the water cycle automatic dust removal device for wood-based panel production is characterized in that: the purified water tank (6) is a closed cylindrical box structure, and the support plate (17), Dividing plate (18), stone block layer (19), gravel layer (20) and fine sand layer (21), on the dividing plate (18), there are evenly distributed apertures. 5. The water cycle automatic dedusting device for wood-based panel production according to claim 1, characterized in that: the volume of the purified water tank (6) is smaller than the volume of the purified water buffer pool (23). 6. a kind of automatic dedusting method of the water cycle automatic dedusting device facing wood-based panel production as claimed in claim 1, it is characterized in that comprising the following steps: A. The controller (30) turns on the water purification pump (A07), the air compressor (29) and the flocculant control electric valve (A09), and the water purification pump (A07) pumps the water in the water purification buffer tank (23) to the spray nozzle (2), the wood-based panel dust enters the spray tower dust collector (4) from the air inlet (1) and is sprayed and settled by the spray nozzle (2), and the purified gas is discharged from the air outlet (3); B. The controller (30) collects the water level value of the flocculation tank level gauge (A11). If the water level detected by the flocculation tank level gauge (A11) does not reach the required value, the controller (30) controls the flocculation water to control the electric valve (A01) is closed, the flocculation pump (A02) stops working, and the purified water tank (6) stops purifying sewage; otherwise, the flocculation water control electric valve (A01) is turned on, the flocculation water pump (A02) is turned on, and the flocculation water pump (A02) is pressed to send flocculation Sewage in the buffer pool (7) to the purified water tank (6); C. The controller (30) collects the pressure value of the pressure sensor (A03). If the pressure does not reach the preset threshold value of the controller (30), it will close the backwash sewage control electric valve (A04), so that the purified water tank (6) is always Purify the sewage; otherwise, close the flocculation water control electric valve (A01), open the backwash sewage control electric valve (A04), close the flocculation water pump (A02), and the purified water tank (6) stops purification for backwashing; D. The controller (30) collects the water level value measured by the sewage tank liquid level gauge (A10) in the backwash sewage tank (13). If the water level value is lower than the preset threshold value, the sewage pump (A05) is turned off, otherwise it is turned on Sump pump (A05). 7. According to the automatic dedusting method of the water cycle automatic dedusting device for wood-based panel production according to claim 6, it is characterized in that: the water level gauge (A08) in the water purification pool (A08) collects the water level in the water purification buffer pool (23), if the water level is not When the required value is reached, the tap water control electric valve (A06) is opened to supply water from the tap water port (22) to the clean water buffer tank (23), otherwise the tap water control electric valve (A06) is closed.