JP6098023B1 - Conveyor return belt cleaning apparatus and conveyor return belt cleaning method - Google Patents

Abstract

A conveyor return belt cleaning device and a cleaning method using the same, while using a high-pressure water cleaning method, minimize water replenishment, and also collect transport particles adhering to the conveyor. A conveyor return belt cleaning apparatus and a conveyor return belt cleaning method according to the present invention regenerates cleaning water required for high-pressure cleaning by purifying turbid water, and circulates water to be used in the conveyor return belt cleaning apparatus. Let The original powder is dehydrated / dried from the sludge slurry generated in the process of purifying the washing water as a dewatered cake, and the granular material contained in the muddy water is conveyed to the subsequent relay conveyor. A sustainable apparatus and method is provided that does not require a separate sludge / slurry dedicated transport facility and can be operated continuously with power and makeup water supply. [Selection] Figure 1

Description

  The present invention relates to an apparatus for cleaning a belt surface soiled with earth, sand, coal, ore, etc. in belt conveyor transportation, and relates to reuse of cleaning water, recovery of cleaning water slurry, and conveyance of granular material after drying of dewatered cake. Provided is a belt conveyor cleaning device that can be sustained by returning it to the belt conveyor.

  When powder particles and granular materials such as earth and sand, coal, ore are transported by a belt conveyor, it is necessary to remove the transported material adhering to the belt conveyor on the discharge side of the belt conveyor. Foreign matter, sand, or mud adhering to the belt surface may bite into the drive parts that support and convey the belt, causing damage such as scratches, polishing, and bearing burnout. After discharging the earth and sand outside, when the return belt is transported into the mine, the mud adhering to the conveyor belt dries with the frictional heat of the carrier etc. and generates a large amount of dust, causing a problem that deteriorates the mine environment, or This is because there is a risk of causing disasters such as ignition by dry dust and dust explosion in the transport of coal and coke.

  Therefore, when transporting earth and sand, coal and ore in the belt conveyor transport, a scraping device called “belt cleaner” is often mounted for the purpose of cleaning the belt surface contaminated with earth and sand, coal and ore. For example, Non-Patent Document 1 describes an example of a belt cleaner. The scraping device slides a scraping tip such as a scraper on the surface to be cleaned on the front and back surfaces of the belt conveyor, and by physical action, particles such as earth and sand, coal, ore, or their mud hydration By scraping off the object, foreign matter, sand and mud adhering to the belt surface are dropped down to clean the belt surface. However, with this scraping method alone, there is a problem that unevenness occurs due to wear of the scraping tip, and complete cleaning cannot be performed.

  Furthermore, in order to make it cleaner, in addition to a contact type cleaning method such as scraping cleaning / brush cleaning, a water cleaning method is also used in combination. Washing with water requires post-treatment of the wash water, and according to chemical treatment means, the wash water is received in a receiving tray and then collected in a water collection tank and purified by adding a purification agent. The consumption of the purifier is also proportional to the use of the wash water, and the additive cost increases according to the use of the wash water (from the description of FIG. 1 of Patent Document 1). For this reason, the problem of “eliminating use of wasted washing water and reducing the cost required for cleaning water purification” (same paragraph 0002, line 6) is recognized, and there is no granular material on the belt conveyor. In some cases, a mechanism that stops washing and avoids wasteful use of washing water was also a solution to the problem (see paragraph 0004, line 5 onwards).

  Patent Document 2 relates to a sprinkler cleaning device provided at a connecting portion of a belt conveyor that transports bulk materials such as coal (paragraph 0001 of Patent Document 2). Conventionally, washing water is drained with an SS (suspended substance amount) of about 5000 ppm, requires a large amount of flocculant, and increases the cost of transporting the dewatered sludge. (Paragraph 0004), rather than treating the waste water with wastewater, instead of using it as a drainage treatment, it is “used for chute sprinkler shower 2” (paragraph 0011 of Patent Document 2) to reduce wastewater treatment targets. (FIG. 1 of Patent Document 2). And, by reducing the amount of wastewater treatment, it is possible to reduce running costs such as reducing the load on wastewater treatment equipment and reducing the transportation cost of sludge treatment, saving clean water and reducing the load on the pump. (Paragraph 0011).

  On the other hand, when high-pressure water cleaning is used for periodic cleaning of a belt conveyor, for example, the plunger pump requires a high level of purified water with a turbidity and solid concentration of 1 mg / L or less. Is done. Patent Document 2 states in paragraph 0002 that “in the conventional sprinkling cleaning device for a conveyor transfer section, the cleaning water has an SS (amount of suspended solids) of about 5000 ppm”, and “the conventional SS is about 300 ppm for chute sprinkling. It uses water ”(Patent Document 2, paragraph 0004). Using the “washing shower” (Claim 1 of Patent Document 2), there is no recognition of the problem of reusing water after purifying the wastewater to a concentration of 1 mg / L or less. Since the wet deposit is scraped off by the scraper 11b after the washing water is applied (Patent Document 2, Paragraph 0003), the conventional water washing and reuse of the washing water as described in Patent Document 2 It is reasonable to understand that low water pressure cleaning was used in the system.

  Even though high-pressure water cleaning is effective for use in regular cleaning of belt conveyors, it is particularly useful for regular cleaning in a closed premises such as in a tunnel. There is a problem that washing muddy water needs to be collected and the water cost becomes high. Even if it is going to use purified water for washing muddy water for high-pressure water washing, the water used for high-pressure water washing has a turbidity of 1 mg / L (in this case, the content of solid matter such as mud, pulverized coal, etc. It was difficult to be reused in reality.

  Thus, it is understood that a large amount of turbid water is generated in the water washing method, and therefore, this method is often used instead of this method and a brush washing performed by a stored water circulation method or a small amount of water. In the case of nozzle cleaning, it is necessary to avoid the risk of the belt being worn by a water jet flow containing muddy water in relation to the turbidity of purified water (content of solid matter such as mud and pulverized coal) that can be put into practical use. Therefore, in the high-pressure water washing, the purified water of the waste water cannot be reused, and generally depends on the low pressure (0.3 to 0.5 MPa) water injection conditions. As a result, due to the low pressure, the cleaning power is weak and the cleaning of the belt conveyor is incomplete. In the low-pressure cleaning, as described in Patent Document 2, a means of “scraping wet deposits with the scraper 11b after applying the cleaning water” is also required, but the deposits cannot be completely removed.

  Thus, even though the strong jet water impinging on the belt due to constant use of high pressure wash water provides the advantage that the deposits can be completely removed, the problem of belt wear becomes apparent and drainage is regenerated. In use, the problem that a high cleanliness level with a solid content concentration of 1 mg / L or less is required is recognized, and these problems related to the constant use of high-pressure washing water are also recognized in Patent Documents 1 and 2. It is understood that there was no suggestion.

The need for high cleanliness of 1 mg / L or less is not only to prevent damage to the high-pressure plunger pump and to prevent belt wear, but also to prevent dust from adhering to the conveyor belt surface due to low-level cleansing water. (The latter point is not related to high pressure cleaning / low pressure cleaning). It was estimated from the following measurement examples that the cleanliness of 1 mg / L or less of washing water required from the former satisfies the necessity of the latter.
The amount of dust remaining on the conveyor due to the turbidity of 1000 mg / L washing water was measured as follows.
(1) Wet the conveyor belt (new) evenly with a turbidity of 1000 mg / L.
(2) The conveyor belt is set up vertically and dried naturally.
(3) Carefully collect the dust on the dried surface with a brush, and measure the mass with a precision pan balance.
When the procedure (1) to (3) was repeated three times and the amount of adhering dust was measured, it was 140 mg / m ^{2 on} average. If all the dust remaining on the conveyor is floating in the atmosphere as viewed from the safety side, the amount of dust generated per minute on the actual machine base is
Estimated dust generation amount per minute = Conveyor speed x Conveyor width x Dust adhesion amount. Using the numerical values of conveyor speed of 200m / min and conveyor width of 1.2m, corresponding to actual machine operating conditions, multiplying the wet area generated per minute by 140mg of dust adhesion, and estimating the amount of dust generated per minute , Get the following.
Dust generation amount per minute = 200m x 1.2m x 140mg / m ² / min
= 33600 mg / min Next, the dust concentration in the air is estimated by the following formula, assuming that the ventilation amount in the tunnel is 3000 m ³ .
Dust concentration in the air = 33600 (mg / min) / 3000 (m ³ )
= 11.2 mg / m ³
Here, the safe allowable value of the concentration of mineral dust in the atmosphere is 0.15 mg / m ³ .
That is, when the turbidity of the washing water is 1000 mg / L, dust concentration in the air is 75 times the 11.2 mg / m ^3, and the safety margin value 0.15 mg / m ^3. It is clear that it is necessary to improve the degree of cleaning by at least an order of magnitude from a purification level of about 300 ppm with conventional flocculants. Even if the margin for the safety tolerance is one digit, if the turbidity (dust concentration) of the washing water is 1 mg / L, it is sufficient for safety and hygiene even when used in a tunnel.

  Next, in the conventional technology for recovering the transported granular material from the cleaning water, in the cleaning of coal powder, the cleaning water is composed of the recovery water from the recovery hopper, a coagulation stirring tank, a coagulation sedimentation tank, a sludge dewatering device, etc. There is one that is sent to a wastewater treatment device, sludge is dehydrated and sent to a coal storage, and wastewater treatment water is reused (FIG. 4 and paragraph 0003 of Patent Document 2). In this prior art, after the turbid water collection, after the treatment in the flocculation agitation tank, the flocculation settling tank, the sludge dewatering is stopped, and the original granular material is not directly returned to the conveyor, but separately, Requires dehydrated sludge transport and final disposal. In the configuration where turbid water is regenerated to purified water using a filtration filter instead of coagulation sedimentation, the surface of the filter is clogged and it is necessary to clean or replace the filter unit, depending on the working time between them Conveyor cleaning must be stopped.

JP 2001-5871 A JP-A-9-255131

http://www.nodatec.co.jp/pg190.html “NODTEC, homepage: What is a belt cleaner”

  The present invention makes it possible to always apply high-pressure cleaning capable of providing high cleanliness to the belt conveyor transfer section, to enable reuse of cleaning water, and to almost recover powder from muddy water to the original belt conveyor. Only the steam in the drying process is returned and dissipated, and it is only necessary to supply makeup water and operating power to compensate for evaporation from the outside. A method for cleaning a belt is provided.

  The conveyor return belt cleaning apparatus and the conveyor return belt cleaning method of the present invention enables reuse of cleaning water as high pressure water cleaning for high pressure water cleaning, minimizes the replenishment amount of water from the outside world, and consumes clean water. In addition, regarding the treatment of turbid water, it should be a sustainable conveyor return belt cleaning device and conveyor return belt cleaning method.

  The conveyor return belt cleaning device and the conveyor return belt cleaning method of the present invention not only prevent dust generation but also almost completely recovers the transported powder particles adhering to the belt conveyor and returns them to the original belt conveyor transport system. This should be a sustainable conveyor return belt cleaning device and conveyor return belt cleaning method that does not require separate disposal of the granules.

  The conveyor return belt cleaning device and the conveyor return belt cleaning method of the present invention uses water for cleaning granular materials, and even if a large amount of muddy water or turbid water is generated in the cleaning water, Through the water purification process, turbid water is recovered by water filtration as washing water with a predetermined high cleanliness level, and can be reused even with high-pressure water washing. It should be a sustainable conveyor return belt cleaning device and a method for cleaning the conveyor return belt that can prevent the occurrence of other post-treatment of muddy water.

  The conveyor return belt cleaning device and the conveyor return belt cleaning method according to the present invention are not used for other purposes, such as chute watering, but the belt conveyor cleaning wastewater is regenerated and reused as cleaning water. Concerning use, there is a sustainable conveyor return belt cleaning device and conveyor return belt cleaning method. This is a conveyor return belt cleaning device and a conveyor return belt cleaning method that require only a small amount of supply water as compared with the conventional water washing method even when makeup water is required.

  The conveyor return belt cleaning device and the conveyor return belt cleaning method of the present invention are substantially free of foreign matter, sand and mud adhering to the belt by high pressure water cleaning, greatly reducing the risk of belt conveyor failure, and dust in the mine. A comfortable environment with no generation should be maintained, and the risk of ignition and explosion by dust should be minimized. A water filtration filter can be used to purify muddy water to a predetermined cleanliness level that can be used for high-pressure water washing, and filter performance can be restored even if deposits accumulate on the filtration surface of the water filtration filter. It should be possible to provide a sustainable conveyor return belt cleaning apparatus, and a sustainable conveyor return belt cleaning method using means capable of recovering filter performance.

  The conveyor return belt cleaning device and the conveyor return belt cleaning method of the present invention enables the original powdery matter to be recovered from the slurry generated in the process of purifying the cleaning water so that it can be reused by dehydration and drying means. It is only necessary to recover the powder and particulates contained in the slab and continue to convey it on the following conveyor, and to supply makeup water and operating power from the outside to compensate for water evaporation during drying. A conveyor return belt cleaning device and a conveyor return belt cleaning method should be realized that do not require a dedicated transport mechanism such as slurry, are low in cost for installation and running, and are sustainable.

The present invention which solved this problem is as follows.
[Invention of Claim 1]
A conveyor return belt cleaning device for cleaning a conveyor return belt to which powder particles on a conveyor are adhered by washing with water, the following components:
A washing water high pressure spray nozzle;
A water receiving member that is disposed below the conveyor return belt and receives turbid water of cleaning water containing the powder particles;
A raw water tank that is in fluid communication with a pipe line connected to the water receiving member and is capable of storing washed muddy water flowing down to the water receiving member;
A water purification unit that is in fluid communication with a pipe line connected to the raw water tank and is capable of purifying the raw water in the raw water tank;
A filter unit that is in fluid communication with a pipe line connected to the water purification unit and that can store the purified water purified by the water purification unit and purify the water;
A wash water recirculation channel in fluid communication with fresh water filtered by the filter unit by a conduit capable of recirculating to the wash water high-pressure injection nozzle;
A slurry conduit in fluid communication with a slurry outlet disposed at the bottom of the water purification unit;
Slurry dewatering and drying means in fluid communication with a high concentration slurry conduit connected to a high concentration slurry outlet disposed at the bottom of the raw water tank;
A filtrate reflux path in fluid communication from the slurry dewatering and drying means by a line connected to the raw water tank; and
A passage of the dewatering cake in fluid communication from the slurry dewatering and drying means to the upper side of the relay conveyor;
Conveyor return belt cleaning device.

[Effects of the invention]
The present invention provides a conveyor return belt cleaning device for a belt conveyor connecting portion, which can provide high cleanliness by cleaning with a washing water high-pressure jet nozzle and can apply high-pressure cleaning to a belt conveyor connecting portion at all times during the operation of the conveyor. To do. The high-pressure washing method using the washing water high-pressure jet nozzle is more efficient for washing than the low-pressure washing, and the effect that the amount of water can be reduced is obtained.

  The conveyor return belt cleaning apparatus of the present invention constitutes a system mechanism that enables reuse of cleaning water for high-pressure water cleaning, and the effect of drastically reducing the cost of using water newly supplied from the outside can be obtained. Since muddy water is closed in the conveyor return belt cleaning device, it is not necessary to add an existing muddy water treatment device, and there is an effect that less replenishment water is required.

  The conveyor return belt cleaning apparatus of the present invention uses cleaning water in high-pressure water cleaning, removes foreign matter, sand and mud adhering to the belt by high-pressure water cleaning, and contains powder particles in the processing liquid, It is effective for countermeasures against occurrence.

  The conveyor return belt cleaning device of the present invention uses water for cleaning granular materials, and even if a large amount of turbid water is generated, turbid water collection and clarified water purification treatment is performed as a post-treatment after using the cleaning water. The turbid water is reused, and even if it is a closed space such as in a tunnel, the generation of a large amount of turbid water is not a problem.

  The conveyor return belt cleaning device of the present invention does not use the belt conveyor cleaning wastewater for other purposes like chute watering, but reuses the cleaning water again, and even if makeup water is required, a small amount of It is a conveyor return belt cleaning device that is sustainable in the sense that it only requires supply of makeup water.

  The conveyor return belt cleaning device of the present invention removes foreign matter, sand and mud adhering to the belt by high-pressure water cleaning, so the risk of failure of the belt conveyor is greatly reduced, dust generation in the mine is prevented, and comfortable Safe environment and minimize the risk of ignition and explosion caused by dust.

  The system combining the water filtration device and the slurry dehydrating / drying means cleans and reuses the turbid water generated by the high-pressure nozzle cleaning. On the other hand, the residue slurry is filtrated and then dehydrated and discharged. This wastewater is also collected in the raw water tank, and the loss of water is limited to the dissipation to the atmosphere by evaporation, so that the effect of high water use efficiency is obtained.

  The dewatering cake is returned to the relay conveyor through the passage communicating with the slurry dehydrating and drying means from the slurry dewatering and drying means to the upper side of the relay conveyor by the slurry pump or the air transport, and is transported to the original conveyor. In addition, it is possible to obtain the equipment effect that a transport mechanism dedicated to the dewatering cake is not required, and to reduce the total manufacturing cost and installation cost of the system device.

[Invention of Claim 2]
The conveyor return belt cleaning apparatus according to claim 1, wherein the fresh water filtered by the filter unit has a suspended solid content concentration of 1 mg / L or less.

[Effects of the invention]
When the suspended solid content concentration is 1 mg / L or less, there is no problem in the operation of the high-pressure pump, and the effect that the belt wear risk due to the jet water is sufficiently reduced can be obtained.

[Invention of Claim 3]
The conveyor return belt cleaning according to claim 1 or 2, wherein the cleaning water high-pressure jet nozzle is a high-pressure water nozzle within a nozzle pressure range of 8 to 11 MPa and includes a high-pressure pump capable of supplying the nozzle pressure at a predetermined flow rate. apparatus.

[Effects of the invention]
If it is the range of nozzle pressure 8-11MPa, it is suitable for ensuring necessary washing | cleaning power, ensuring the belt wear risk and the economical efficiency of a high pressure pump.

[Invention of Claim 4]
The water purification unit includes a water filtration container and the following components in the water filtration container:
A water filtration filter;
A filter cleaning nozzle disposed opposite the water filtration filter;
A slurry outlet disposed at the bottom of the water filtration vessel;
The slurry tube is capable of discharging deposits on the surface of the filter washed away by the washing liquid jet from the filter washing nozzle as a slurry together with the raw water from the slurry outlet, and in fluid communication with the slurry outlet. The conveyor return belt cleaning device according to any one of claims 1 to 3, which is transportable to the raw water tank through a path.

[Effects of the invention]
The system that combines the water filtration device and the slurry dehydrating and drying means cleans and reuses the turbid water generated by high-pressure nozzle cleaning, while the membrane deposits generated by the water purification unit are removed from the surface of the filter filtration membrane by the cleaning nozzle. The slurry is discharged from the bottom of the container as a slurry and sent to the slurry dehydrating and drying means via the raw water tank. Membrane deposits on the surface of the filter filtration membrane do not require replacement of the filter, are removed from the surface of the filter filtration membrane, and maintenance of the conveyor return belt cleaning device is not required for maintenance of the filter. Provided is a conveyor return belt cleaning device that is sustainable in terms of enabling. After the slurry is solid-liquid separated by slurry dehydration and drying means, water is dehydrated and discharged, and this drainage is also returned to the raw water tank and recovered, and the loss of water is limited to dissipation to the atmosphere due to evaporation, and the water reuse rate is high Effective and sustainable.

[Invention of Claim 5]
A high-pressure water cleaning method for a conveyor return belt using the conveyor return belt cleaning device according to any one of claims 1 to 4, wherein the cleaning water high-pressure spray nozzle described below is used when the conveyor speed is in a range of 160 m to 200 m per minute. Injection conditions:
Nozzle pressure 8-11 MPa;
Nozzle water volume per nozzle 20 to 23 L / min;
Nozzle distance 200-400 mm;
Nozzle angle 50-60 °, and;
Cleaning width per nozzle 220 mm to 250 mm;
A high pressure cleaning method for a conveyor return belt for high pressure water washing according to spraying conditions including:

[Effects of the invention]
If it is the injection conditions of said washing water high-pressure injection nozzle, it is suitable for ensuring necessary cleaning power while ensuring belt wear risk and economics of a high pressure pump.

[Invention of Claim 6]
The preventive maintenance method of the conveyor using the conveyor return belt cleaning apparatus of any one of Claims 1-4 which acquires the laser camera image of the conveyor surface after washing | cleaning, and test | inspects the micro laceration which arose on the conveyor surface.

[Effects of the invention]
The foreign matter, sand, and mud adhering to the belt are almost removed by cleaning with the high-pressure water nozzle, so that the accuracy of detection is not significantly reduced due to mud contamination on the surface, and the detection accuracy of the micro laceration on the belt surface is increased and preventive maintenance is performed. The effect that it contributes to is obtained.

[Invention of Claim 7]
A method for cleaning a conveyor return belt, in which a conveyor return belt to which powder particles on a conveyor are attached is washed with water, and includes the following:
A high pressure water washing step S100 for washing the conveyor return belt with high pressure water by means of a washing water high pressure spray nozzle;
Raw water tank precipitation stage S200 for receiving turbid water containing washing powder containing the granular material below the conveyor return belt, storing the turbid water flowing down, and precipitating raw water content in the raw water tank;
In fluid communication with said raw water tank and pipe line, receiving raw water of the raw water tank, the raw water and water purification the raw water in the water purification unit having a filter for filtering, combined, the raw water to the filtration surface of the filter On the other hand, a water purification step S300 that sprays as a cleaning fluid and deposits accumulated on the filtration surface of the filter to the bottom of the water purification unit to generate a slurry at the bottom of the water purification unit;
A water purification step S400 for receiving purified water from the water purification unit and purifying with a filter unit;
A washing water refluxing step S500 for refluxing the fresh water filtered by the filter unit to the washing water high-pressure injection nozzle;
The slurry at the bottom of the container of the water purification unit generated in the water purification step S300 is transferred to the raw water tank by a slurry pipe connected to the slurry outlet disposed at the bottom of the water purification unit. Returning to the bottom of the container, slurry transfer step S600 step;
A high-concentration slurry outlet disposed at the bottom of the raw water tank and a high-concentration slurry pipe that is connected to the high-concentration slurry outlet, and a high-concentration slurry that is precipitated in the raw water tank are pumped to the slurry dewatering and drying means Concentration slurry pumping step S700;
A slurry dehydration drying step S800 for dehydrating and drying the high concentration slurry by the slurry dehydration drying means;
A dewatering cake transporting step S900 for transporting the dewatered and dried cake from the slurry dewatering and drying means to the upper side of the relay conveyor using the path of the dewatered and dried cake; and
A dehydrated filtrate refluxing step S1000 for refluxing the filtrate from the slurry dehydrating and drying means to the raw water tank by a pipe line connected to the raw water tank;
Conveyor return belt cleaning method.

[Effects of the invention]
The cleaning method of the conveyor return belt of the present invention does not use the belt conveyor cleaning drainage for other purposes like chute watering, but circulates and reuses the cleaning water again, so that the use of water is sustainable. This is a conveyor return belt cleaning device. This is a sustainable conveyor return belt cleaning method in the sense that a small amount of makeup water can be supplied even when makeup water is required.

  The conveyor return belt cleaning method of the present invention substantially removes foreign matter, sand and mud adhering to the belt by high-pressure water cleaning, greatly reducing the risk of failure of the belt conveyor and preventing dust generation in the mine, It is possible to maintain a comfortable environment and to minimize the risk of ignition and explosion caused by dust.

  The turbid water generated by the high-pressure nozzle cleaning is purified and reused by the conveyor return belt cleaning method that combines the water filtration device and the slurry dehydrating and drying means. On the other hand, the residue slurry is filtrated and then dehydrated and discharged. This wastewater is also collected in the raw water tank, and the loss of water is limited to the dissipation to the atmosphere by evaporation, so that the effect of high water use efficiency is obtained.

[Invention of Claim 8]
The method for cleaning a conveyor return belt according to claim 7, wherein the conveyor return belt cleaning device according to any one of claims 1 to 4 is used.

[Invention of Claim 9]
The conveyor return belt cleaning apparatus according to any one of claims 1 to 4, which can be maintained from the outside only by replenishing steam lost by the slurry dehydrating and drying means and supplying operating power.

[Effects of the invention]
The effect that it is substantially sustainable only by replenishment of steam and supply of operating power is obtained.

[Invention of Claim 10]
9. The method for cleaning a conveyor return belt according to claim 5, 7 or 8, wherein the method can be sustained only by replenishing steam lost by the slurry dehydrating and drying means and supplying operating power.

[Effects of the invention]
The effect that it is substantially sustainable only by replenishment of steam and supply of operating power is obtained.

1 is an overall system diagram of a conveyor return belt cleaning apparatus 1 to which an embodiment of the present invention is applied. It is a side surface schematic diagram which shows the relationship between the conveyance conveyor of the conveyor return belt washing | cleaning apparatus 1 with which one embodiment of this invention is applied, and a relay conveyor. It is a figure which shows each step step of the conveyor return belt washing | cleaning method which uses the conveyor return belt washing | cleaning apparatus 1 shown by FIG.1 and FIG.2 which is another embodiment of this invention.

  Below, the conveyor return belt washing | cleaning apparatus 1 by embodiment of this invention is demonstrated using FIG.1 and FIG.2. FIG. 1 is a system diagram of a main part of a conveyor return belt cleaning apparatus 1 to which an embodiment of the present invention according to the embodiment is applied, and is a schematic diagram partially showing the inside of a container of constituent component devices. . FIG. 2 is a schematic side view schematically showing the relationship between a transport conveyor (hereinafter also referred to as a primary conveyor), a relay conveyor associated therewith, and the conveyor return belt cleaning apparatus 1 according to the present invention.

In one embodiment, the conveyor return belt cleaning device 1 according to the present invention is a conveyor return belt cleaning device that cleans the conveyor return belt 9 to which the powder particles 4 on the transport conveyor (hereinafter also referred to as a primary conveyor) 2 adhere by washing with water. The apparatus 1 includes the following components: a washing water high-pressure injection nozzle; a water receiving member; a raw water tank; a water purification unit; a filter unit; a slurry dewatering and drying means; a washing water reflux channel; a slurry pipeline; This is a conveyor return belt cleaning device having a dewatering cake passage as a constituent element. That is, a conveyor return belt cleaning device that cleans a conveyor return belt to which powder particles on a transport conveyor adhere by washing with water, and includes the following components:
Washing water high pressure injection nozzle 11;
A water receiving member 15 disposed below the conveyor return belt 9 and receiving turbid water of the cleaning water containing the granular material 4;
A raw water tank 50 that is in fluid communication with a conduit 39 connected to the water receiving member 15 and is capable of storing the muddy water flowing down to the water receiving member 15;
Water purification units 100 and 101 that are in fluid communication with a pipe line 90 connected to the raw water tank 50 and are capable of purifying the raw water in the raw water tank 50;
A filter unit 201 that is in fluid communication with a pipe line 190 connected to the water purification units 100 and 101, stores the purified water purified by the water purification units 100 and 101, and can be purified.
A washing water reflux channel 250 that fluidly communicates the fresh water filtered by the filter unit 201 to the washing water high-pressure jet nozzle 11 through a conduit that can be refluxed;
A slurry conduit 154 in fluid communication with the raw water tank 50 and a slurry outlet 113 disposed at the bottom of the water purification units 100 and 101;
Slurry dehydrating and drying means 400 in fluid communication with a high concentration slurry conduit 204 connected to a high concentration slurry outlet 63 disposed at the bottom of the raw water tank 50;
A filtrate reflux path 470 in fluid communication from the slurry dewatering and drying means 400 by a line connected to the raw water tank 50;
A passage 304 of the dewatering cake that is in fluid communication from the slurry dewatering and drying means 400 to the upper portion of the relay conveyor 3;
It is the conveyor return belt washing | cleaning apparatus 1 containing this.
Below, each component component of the conveyor return belt washing | cleaning apparatus 1 is explained in full detail.

<Washing water high pressure injection nozzle 11>
In this embodiment, the conveyor return belt washing | cleaning apparatus 1 is equipped with the washing water high pressure injection nozzle 11 under the conveyor return belt 9 to which the granular material 4 on the conveyance conveyor (primary conveyor) 2 adhered. The washing water is jetted from the washing water high-pressure jet nozzle 11 and the water adhering to the conveyor return belt 9 is almost washed away. The cleaning water high-pressure spray nozzles 11 are arranged with a cleaning width per nozzle in the range of 220 mm to 250 mm at almost equal intervals in the width direction of the belt. The nozzle distance between the belt 9 and the washing water high-pressure jet nozzle 11 is in the range of 200 to 400 mm, and the nozzle jet central angle θ is arranged at a position of 50 to 60 °.

  According to the above-described configuration and arrangement of the washing water high-pressure injection nozzle 11, the nozzle pressure of 8 to 11 MPa, and the injection condition of the nozzle water amount 20 to 23 L / min per nozzle, The high-pressure cleaning ability of the conveyor return belt 9 is exerted to a high degree, and a high cleaning effect that foreign matter, sand and mud adhering to the belt are almost removed by high-pressure water cleaning can be obtained.

<Water receiving member 15>
In this embodiment, muddy water containing foreign matter, sand and mud adhering to the belt is received by the water receiving member 15, and the muddy water outlet 33 provided at the lower end of the water receiving member 15 is arranged further downward by the pipe line 39. The raw water tank 50 is in fluid communication. The muddy water can flow down the pipe 39 and flow into the raw water tank container 51 from the inlet 61 of the raw water tank.
<Raw water tank 50>
In the present embodiment, the raw water tank 50 is disposed below the water receiving member 15, and is in fluid communication with the upper surface of the water receiving member 15 by the conduit 39. The muddy water flows down from the muddy water outlet 33 at the lower part of the water receiving member 15, fluidly communicates with the water receiving member 15, and is supplied from the muddy water inlet 61 provided at the upper portion of the raw water tank 50 where muddy water can be stored. In the raw water tank container 51, the turbid water is agitated by the internal swirling flow, and foreign matter, sand, and mud settle below the baffle plate provided in the central part of the raw water tank container 51. An outlet pump 62 is installed on the upper part of the raw water tank container 51 where the slurry can be precipitated at the bottom of the raw water tank container 51. The raw water is directed to the water purification unit 100, 101, and the raw water is the supernatant water of the raw water tank. Is supplied from the raw water inlet 120 of the water purification unit 100 which is pumped up by the outlet pump 62 and is in fluid communication with the raw water tank 50 through the pipe line 90. Te, and is capable put into water purification unit 100.

<Water purification unit>
In this embodiment, each water purification unit has the same water filtration mechanism, and in this embodiment, two water purification units 100 and 101 are included in the configuration. It is provided in the water purification container water filtration container 111 (the code is described below for the water purification unit 100, but the same applies to the water purification unit 101), the outer surface is the filtration surface, and the inside has a filtrate passage. The filter 110 can filter the raw water to a predetermined level of purified water. Raw water is supplied between the inner surface of the water purification container water filtration container 111 and the outer surface of the filter 110, and the raw water permeates from the outer surface to the inner surface and can be filtered. The purified water staying inside the filter 110 at a predetermined level can be pumped by the pump 240 from the purified water outlet 121 through the outlet valve 122 to the inlet 220 of the filter unit 201 from the pipe line 190 in fluid communication with the filter unit 201. Then, the purified water is input / stored in the filter unit 201.

  In the present embodiment, in the water filtration container 111 of the water purification unit 100, an injection nozzle 118 that blows raw water as a cleaning fluid against the filtration surface of the filter 110 is provided and accumulated on the filtration surface. The deposits can be washed with raw water sprayed from the spray nozzle 118. By spraying the raw water from the spray nozzle 118, the deposit film accumulated on the filtration surface can fall downward. At the top of the water filtration container 111 of the water purification unit 100, 101, a motor 130 is disposed that is coupled to the central axis of a cylindrical filter 110 that is rotatably suspended from the water filtration container 111. The filter 110 is rotatable in the water filtration container 111 so that the filtration surface passes through the spraying range of the cleaning fluid from the spray nozzle 118, and the filter 110 rotates in the water filtration container 111 at a predetermined rotation speed. Is possible. In this way, the film-like deposits accumulated on the filtration surface of the filter 110 are washed by the injection nozzle 118 provided in the water filtration container 111 at any time or at any time, and the water purification units 100 and 101 are cleaned. Falls and accumulates at the bottom of the water filtration container 111.

<Filter unit 201>
In the present embodiment, the filter unit 201 is in fluid communication with one or a plurality of water purification units 100 and 101 by a pipe line 190, and each of the filter units 201 includes a water filtration container 211, similar to the water purification units 100 and 101. A filter unit 210 is provided in the water filtration container 211 of the filter unit, the outer surface is a filtration surface, and the filter 210 having a filtrate passage inside allows filtration of the suspended solid content concentration to a level of 1 mg / L or less. In the present embodiment, the water purification unit 100, 101 has already cleaned the raw water to the purified water level, and the filter unit 201 further purified the water to a level where the suspended solid content concentration is 1 mg / L or less. Here, the expression “clean water” means that the degree of cleanliness in the water purification units 100 and 101 is further increased, and indicates the relative cleanliness level between the water purification unit 100 and the filter unit 201. In the form, the suspended matter amount concentration of the outlet water of the filter unit 201 is at a level of 1 mg / L or less.

<Washing water reflux channel 250>
In the present embodiment, the cleaning water recirculation water channel 250 is in fluid communication from the center of the filter unit 201 to the cleaning water high-pressure injection nozzle 11 from the fresh water outlet 231 via the high-pressure pump 260. The water contained in the muddy water originally flowing down as muddy water can be adjusted in pressure by the inverter 261 of the high-pressure pump 260 and reused as the washing water in the washing water high-pressure injection nozzle 11. The washing water recirculation water channel 250 penetrates the water receiving part 15 and is connected to each washing water high-pressure injection nozzle 11. The fresh water purified by the filter unit 201 can be supplied to each washing water high-pressure injection nozzle 11 as washing water. Has been.

<Slurry line 154>
In this embodiment, the slurry pipe line 154 fluidly communicates the raw water tank 50 and the slurry outlet 113 disposed at the bottom of the water purification units 100 and 101, and deposits dropped on the bottom of the water purification unit 100. Is discharged as a slurry and can be transferred to the lower part of the raw water tank container 51. The mixture of raw water and deposits forms a slurry at the bottom of the water purification unit 100 and is discharged as a slurry from a slurry outlet 113 provided at the bottom of the water filtration container 111.

<Slurry dehydration drying means 400>
In the present embodiment, the high-concentration slurry that has been precipitated in the raw water tank 50 and transferred from the water purification units 100 and 101 as the precipitate slurry in the raw water tank 50 is also mixed. The slurry is discharged from the lower slurry outlet 63 and can be put into the slurry dehydrating and drying means 400. The slurry dehydrating and drying means 400 includes a dehydrating function and a drying function, but the dehydrating function and the drying function may have separate casings. If both functions are integrated as in this embodiment, there is no need for a structure for transferring the dewatering cake by communicating between the dewatering function / drying function and the individual housings, and there is an advantage that the installation space can be reduced. In this embodiment, the slurry dewatering / drying means 400 constitutes a slurry dewatering / drying apparatus 400 having both a dewatering function and a drying function as one component. The slurry dehydrating and drying apparatus 400 includes a dehydrating and drying container 411, a cylindrical body 410 provided in the dehydrating and drying container 411, having a perforation hole formed in a wall surface and having a filtrate passage formed therein, and a wall surface of the cylindrical body 410 A hydrophilic filtration membrane (not shown) formed on the outside of the filter, a heated gas passage (not shown) formed between the back surface (not shown) of the filtration membrane and the surface of the cylindrical body, and the heated gas Heating gas supply means 413 for supplying a heated gas to the passage, and the filtration membrane can be heated from the back side by the supplied heated gas.

  The heated gas supply means 413 includes a blower 495 and a heat source 494. The heated gas passes through the heated gas means 413, passes through a heated gas passage (not shown) formed between the surfaces of the cylindrical body, and moves upward. The gas is discharged from the heated gas outlet 482 through the exhaust passage 483 and discharged to the outside air. The high concentration slurry is introduced into the dehydration drying container 411 from the slurry inlet 420, and the high concentration slurry is filtered from the dehydration drying container 411 pressurized by the compressor 493 into the cylindrical body 410.

  The hydrophilic filtration membrane formed on the outside of the wall surface of the cylindrical body 410 is a pleated filter including a plurality of ridges formed in a zigzag shape on the outer wall surface of the cylindrical body 410, and the heated gas passage is the pleat. A heated pleated filter is formed in the filter cage (not shown) and dehydrates and dries the cake adhering to the filter membrane. The filtrate flows down through a filtrate passage (not shown) formed inside the cylindrical body 410 and shares a supporting structure with the heated gas supply means 413 that passes through the dehydration drying container 411 and is connected to the lower part of the cylindrical body 410. The filtrate discharge pipe 462 discharges the filtrate from the filtrate discharge pipe 462 to the filtrate reflux path 470 outside the dehydration drying container 411.

<Slurry dehydrated filtrate reflux path 470>
In this embodiment, the slurry dehydrating filtrate reflux path 470 fluidly communicates the slurry dehydrating and drying means 400 and the raw water tank 50, and the filtrate discharged from the slurry dehydrating and drying apparatus 400 is connected to the filtrate reflux path 470. It is possible to return to the raw water tank 50 from the filtrate inlet 71. While the turbid water generated by high-pressure nozzle washing is purified and reused by the water purification units 100 and 101 which are water filtration devices, the slurry drained and dried by the slurry dehydration drying device 400 is used to remove the filtrate discharged after solid-liquid separation by the raw water tank 50. The recovered filtrate is returned to the water purification units 100 and 101 again. Here, the loss of water from the entire system is limited to the dissipation to the atmosphere by evaporation, and the effect of high water use efficiency is obtained.

<Powder recirculation passage 304>
In the present embodiment, the present invention further includes a granular material reflux passage 304 that is a transport mechanism of the dehydrated cake generated by the slurry dehydrating and drying unit 400, and the granular material reflux passage 304 includes the slurry pump 301, or The dewatering cake can be conveyed to the relay conveyor 3 including an air conveyance mechanism (not shown). With this configuration, the dewatering cake can be discharged onto the relay conveyor 3 by the slurry pump 301 or air conveyance (not shown), and there is no need for a special conveying mechanism dedicated to the dewatering cake. The effect of reducing the total manufacturing cost and installation cost of the belt cleaning apparatus 1 can be obtained.

More specifically, the dehydration and drying of the cake and the reflux of the filtrate using the mechanism are performed according to the following configuration.
The filtrate reflux path 470 is provided with a filtrate outlet valve 471 that enables opening and closing of a pipe line with the filtrate discharge pipe 462, and a hot air inlet valve on the blower 495 and heat source 494 side of the heating gas supply means 413. 412 is disposed, and the high-concentration slurry is discharged from the slurry outlet 63 at the lower part of the raw water tank, and the high-concentration slurry is introduced into the slurry dehydrating and drying means 400 from the inlet 420. At this time, the hot air inlet valve 412 is closed. The high concentration slurry is filled in the dehydration drying container 411, and filtration of the high concentration slurry is started. A cake layer is generated on the surface filtration membrane of the pleated filter composed of a plurality of ridges formed in a zigzag shape on the outer wall surface of the cylindrical body 410. The filtrate extracted into the tubular body 410 passes through the opened filtrate outlet valve 471, and the filtrate is discharged out of the dehydrating and drying vessel 411 from the filtrate discharge pipe 462 via the filtrate reflux path 470, through the filtrate inlet 71, It returns to the raw water tank 50. After determining that the film thickness has reached a predetermined thickness, the slurry in the dehydration drying container 411 is discharged.
Next, the dehydration function is actuated, while the high concentration slurry inlet valve and the hot air inlet valve 412 are closed, air is sent from the pressure pipe 492 by the compressor 493 to increase the pressure in the dehydration drying container 411 and the dehydration drying container 411. The liquid inside is pressurized and discharged. The pleated filter cake membrane of the cylindrical body 410 is also pressurized and dehydrated.
After dehydration, the heating means is operated, the filtrate outlet valve 471 is closed, the hot air inlet valve 412 is opened, the heated gas is supplied by the blower 495 and the heat source 494, the heated gas passes through the heated gas supply pipe 413, The cake film on the surface of the pleat filter passes through a heated gas passage (not shown) formed between the surfaces of the cylindrical body, passes upward, passes through a heated gas outlet 482, passes through an exhaust passage 483, and is discharged to the outside air. It is dried and solidified there.
After drying, the hot air inlet valve 412 is also closed, an air pulse is generated from the compressor 493, the solidified cake is crushed by the impact of pressure, and the solidified cake is removed from the filter surface and dropped to the inner bottom of the dehydration drying container 411. . The dry cake discharge valve 303 is opened, and the dry cake is transported to the relay conveyor 3 by the slurry pump 301 or a transport mechanism 304 including an air transport mechanism (not shown).

  According to the present embodiment, the present invention provides a high-pressure water nozzle 11 in which the cleaning water high-pressure injection nozzle 11 is within a nozzle pressure range of 8 to 11 MPa, and supplies the cleaning water while maintaining the nozzle pressure at a predetermined flow rate. The conveyor return belt cleaning apparatus 1 according to claim 1, comprising a high-pressure pump 260 capable of performing the following operation. If it is the range of nozzle pressure 8-11MPa, it is suitable for the wear risk of the conveyor return belt 9, and the economical ensuring of the high pressure pump 260.

In the present embodiment, the conveyor return belt cleaning device 1 has the following cleaning water high-pressure spray nozzle spraying conditions when the conveyor speed is in a range of 160 m to 200 meters:
Nozzle pressure 8-11 MPa;
Nozzle water volume per nozzle 20 to 23 L / min;
Nozzle distance 200-400 mm;
Nozzle angle θ 50-60 ° and;
Cleaning width per nozzle 220 mm to 250 mm;
If the high pressure water washing is performed under the injection conditions including the high pressure washing ability of the conveyor return belt, the high pressure water washing can completely remove foreign matters, sand and mud adhering to the belt, and can obtain a high washing effect. At the same time, it reduces belt wear and prevents performance degradation. Unlike the low-pressure cleaning in the water washing method, it is not necessary to scrape wet deposits with the scraper after the washing water is applied, and the scraper 17 disposed behind the belt is a draining scraper. Foreign matter adhering to the belt is washed away completely by the water washing method, which is effective for dust generation countermeasures.

  Here, by taking a laser camera image of the cleaned conveyor surface behind the scraper 17 and inspecting the conveyor surface, foreign matter, sand and mud adhering to the belt can be completely removed by high-pressure water cleaning. Therefore, the micro laceration generated on the conveyor surface is not concealed by mud and can be recognized, which is advantageous for preventive maintenance of the conveyor.

  FIG. 3 shows an embodiment of a conveyor return belt cleaning method as another embodiment of the present invention. This method can also use the conveyor return belt cleaning apparatus 1 shown in FIGS. 1 and 2. In this case, the configuration and function of the conveyor return belt cleaning apparatus 1 are as described above, and in the description of the embodiment described in detail below, reference numerals are used to refer to means used to implement each stage of the method of the present invention. Refers to the reference numerals shown in FIG. 1 and FIG. The conveyor return belt cleaning method S1, which is an embodiment of the conveyor return belt cleaning method, includes a high-pressure water cleaning stage S100, a raw water tank precipitation stage S200, a water purification stage S300, a water purification stage S400, a washing water reflux stage S500, and a slurry transfer stage. S600, high concentration slurry pumping step S700, slurry dehydrating and drying step S800, dewatering cake conveying step S900 and dehydrated filtrate refluxing step S1000 are included.

[High pressure water washing step S100]
The conveyor return belt cleaning method S1 shown in the present embodiment includes a high-pressure water cleaning stage S100 as an initial stage, and at this stage, the conveyor return to which the powder particles 4 on the conveyor (primary conveyor) 2 are attached. This is a stage in which the belt 9 is almost washed away by water jetted from the washing water high-pressure jet nozzle 11 from below. The cleaning water high-pressure spray nozzle 11 has a cleaning width per nozzle in the range of 220 mm to 250 mm at approximately equal intervals in the width direction of the belt and a conveyor speed of 160 m to 200 meters. The nozzle distance to the injection nozzle 11 is in the range of 200 to 400 mm, and the configuration and arrangement of the cleaning water high-pressure injection nozzle 11 in which the nozzle injection central angle θ is arranged at a position of 50 to 60 °, and the amount of nozzle water per nozzle If high pressure water washing is performed under the injection conditions of 20 to 23 L / min and nozzle pressure of 8 to 11 MPa, the high pressure washing ability of the conveyor return belt 9 is demonstrated, and the foreign matter, sand and mud adhering to the belt are almost completely obtained by high pressure water washing. A higher cleaning effect can be obtained.

[Raw water tank precipitation stage S200]
In the present embodiment, the raw water tank precipitation stage S200 is included as the next stage of the high-pressure water washing stage S100. Waste water containing foreign matter, sand, and mud that has been washed with water in the high-pressure water washing step S100 and adhered to the belt receives turbid water containing the granular material 4 by the water receiving member 15 installed below the conveyor return belt 9.
The muddy water flows down from the muddy water outlet 33 at the lower part of the water receiving member 15, fluidly communicates with the water receiving member 15, and is supplied from the muddy water inlet 61 provided at the upper portion of the raw water tank 50 where muddy water can be stored. 50 flows into the raw water tank 50 where it is collected and stored. In the raw water tank 50, muddy water is agitated by the internal swirling flow 80, and foreign matter, sand, and mud are settled downwardly partitioned by the baffle plate 53 to form a precipitate slurry at the bottom of the raw water tank container 51. is there.

[Water purification stage S300]
In the present embodiment, the water purification stage S300 is included as the next stage of the raw water tank precipitation stage S200 stage. Each of the water purification units used at this stage constitutes a water filtration device, and its water filtration container 111 (hereinafter, the code is described for the water purification unit 100, but the same applies to the water purification unit 101. ) And is filtered by a filter 110 having an outer surface as a filtration surface and a filtrate passage inside. Supernatant water is introduced into the water purification units 100 and 101 from the raw water inlet 120 through the valve 119 by the outlet pump 62 installed at the upper part of the raw water tank container 51. Raw water is supplied between the inner surface of the water filtration container 111 and the outer surface of the filter 110, and the raw water is permeated from the outer surface to the inner surface and filtered to obtain a predetermined level of purified water, which is stored in the inner region of the filter 110. It is a stage.

  In the water purification step S300, a spray nozzle 118 that blows raw water as a cleaning fluid to the filtration surface of the filter 110 is provided in the water filtration container 111 of the water purification unit 100 used in the present embodiment. The deposits accumulated on the filtration surface are washed by the raw water sprayed from the spray nozzle 118 and fall downward. The filter 110 can be rotated in the water filtration container by the motor 130 and rotates in the water filtration container 111 so that the filtration surface passes through the spraying range of the cleaning fluid from the spray nozzle 118. In this way, the filter 110 is a stage in which deposits accumulated on the filtration surface are washed and dropped downward by the injection nozzle 118 provided in the water filtration container 111 at any time or at any time. It is.

[Water purification stage S400]
In this embodiment, the water purification stage S400 is included as the next stage of the water purification stage S300. At this stage, each filter unit has a water filtration container 211 as in the case of the water purification unit. The purified water fed from the purified water outlet 121 of the water purification unit 121 through the outlet valve 122 to the inlet 220 of the water filtration container 211 by the pump 240 and charged / stored in the filter unit 201 is stored in the water filtration container 211 of the filter unit 201. And is filtered by a filter 210 having an outer surface as a filtration surface and having a filtrate passage therein. Here, the water purification unit 100, 101 has already cleaned the raw water to the purified water level, and the filter unit 201 is further purified to a predetermined level, and the suspended matter amount concentration is purified to a level of 1 mg / L or less. It is.

[Washing water reflux stage S500]
In the present embodiment, the washing water refluxing step S500 is included as the next step of the water purification step S400. In this stage, fresh water is pumped from the center of the filter unit to the washing water high-pressure injection nozzle from the fresh water outlet 231 by the high-pressure pump 260, and the water contained in the muddy water that has flowed down as muddy water before is reused as reclaimed water. This is a possible stage.

[Slurry transfer stage S600]
In the present embodiment, the slurry transfer stage S600 is included as the next stage of the water purification stage S300. In the water purification step S300, the raw water is sprayed on the filtration surface of the filter 12 as a cleaning fluid, and the deposits accumulated on the filtration surface are washed by the raw water sprayed from the spray nozzle 20 and dropped downward with the raw water. The mixture of deposits forms a slurry at the bottom of the water filtration container 111 and is discharged as a slurry from a slurry outlet 113 provided at the bottom of the water filtration container 111 at this stage. In this stage, the slurry passes through the pipe 154 that is in fluid communication with the slurry outlet 113 and is returned to the lower portion of the raw water tank container 51.

[High concentration slurry pumping stage S700]
In the present embodiment, a high-concentration slurry pumping stage S700 is included as the next stage of the slurry transfer stage S600. This stage is settled in the raw water tank 50, the slurry precipitate of the water purification unit 100 is also mixed as the precipitate slurry of the raw water tank 50, and the high concentration slurry whose concentration has increased in the raw water tank 50 after the precipitation is the raw water tank This is a stage where the high-concentration slurry outlet 63 at the bottom of the container 51 is discharged from the high-concentration slurry outlet 63 and is pumped to the slurry dehydrating and drying means 400 by the pumping pump 221.

[Slurry dehydration drying step S800]
In this embodiment, the slurry dehydration drying step S800 is included as the next step of the high concentration slurry pumping step S700. This stage uses the slurry dehydrating / drying means 400 and includes a dehydrating sub-stage and a drying sub-stage, but a dehydrating means and a drying means having separate casings may be used in the dehydrating sub-stage and the drying sub-stage. If both means are integrated, there is no need for means for transferring the dewatered cake by communicating between the two types of housings, and there is an advantage that the installation space can be reduced. The slurry dehydrating / drying means 400 used in this stage includes a dehydrating / drying container 411, a cylindrical body 410 provided in the dehydrating / drying container 411, a perforation hole is formed in a wall surface, and a filtrate passage is formed therein. A hydrophilic filtration membrane formed outside the wall surface of the shape 410, a heated gas passage (not shown) formed between the back surface of the filtration membrane and the surface of the cylindrical shape 410, and the heated gas passage (shown) A heating gas supply means 413 for supplying the heating gas to the heating gas supply means 413, and heating the filtration membrane from the back side with the supplied heating gas to dehydrate and dry the high-concentration slurry.

  The heated gas supply means 413 includes a blower 495 and a heat source 494. At this stage, the heated gas passes through the heated gas supply pipe 462 and is formed between the surfaces of the cylindrical body (not shown). Through the exhaust gas passage 482 and exhausted to the outside air. The high-concentration slurry is charged into the dehydration / drying container 411 from the slurry inlet 420, and the high-concentration slurry is filtered from the dehydration / drying container 411 pressurized by the compressor 493 to the region inside the cylindrical body 410.

The hydrophilic filtration membrane formed outside the wall surface of the cylindrical body 410 is a pleated filter (not shown) including a plurality of ridges formed in a zigzag shape on the outer wall surface of the cylindrical body 410, and the heated gas A passage is formed in the cage of the pleated filter, and the heated pleated filter dehydrates and dries the cake adhering to the filtration membrane. The filtrate flows down through a filtrate passage (not shown) formed inside the cylindrical body 410 and shares a supporting structure with the heated gas supply means 413 that passes through the dehydration drying container 411 and is connected to the lower part of the cylindrical body 410. In this stage, the filtrate is discharged from the filtrate discharge pipe 462 to the filtrate reflux path 470 by the filtrate discharge pipe 462.
In this stage, more specifically, the slurry is dehydrated and dried as follows.
A filtrate outlet valve 471 disposed to enable the opening and closing of the conduit between the filtrate reflux passage 470 and the filtrate discharge pipe 462, and the blower 495 and heat source 494 side of the heating gas supply means 413 are disposed. The hot air inlet valve 412 is closed first, and the high concentration slurry is charged from the raw water tank via the slurry inlet 420 and the high concentration slurry is filled in the dehydration drying container 411. Filtration of the high concentration slurry is started. A cake layer is generated as a surface filtration membrane of a pleated filter composed of a plurality of ridges formed in a zigzag shape on the outer wall surface of the tubular body 410. The filtrate extracted into the tubular body 410 passes through the opened filtrate outlet valve 471, and the filtrate is discharged out of the dehydration drying vessel 411 from the filtrate discharge pipe 462 to the filtrate reflux path 470, passes through the filtrate inlet 71, and is supplied to the raw water. Reflux to tank 50. After determining that the film thickness has reached a predetermined thickness, the slurry in the dehydration drying container 411 is discharged.
Next, the dehydration function is activated, and air is fed from the air pressure pipe 492 into the dehydration drying container 411 by the compressor 493 while the high concentration slurry inlet valve 420 and the hot air inlet valve 412 are closed, and the pressure in the dehydration drying container 411 is increased. The liquid in the dehydrating and drying container 411 is discharged under pressure. The cylindrical pleated filter cake membrane is also pressurized and dehydrated.
After dehydration, heating means is applied. The filtrate outlet valve 471 is closed, the hot air inlet valve 412 is opened, the heated gas is supplied by the blower 495 and the heat source 494, and the heated gas passes through the heated gas supply means 413 and is formed between the surfaces of the cylindrical body. The cake film on the surface of the pleat filter is dried and solidified there while passing through the heated gas passage (not shown), passing upward, passing through the heated gas outlet 482, passing through the exhaust passage 483, and being discharged to the outside air.
After the cake drying, the hot air inlet valve 412 is also closed, an air pulse is generated from the compressor 493, the solidified cake is crushed by the impact pressure, and the solidified cake is removed from the filter surface and dropped to the inner bottom of the dehydration drying container 411. .

[Dehydrated cake transport stage S900]
In the present embodiment, a dewatering cake conveying step S900 is included as the next step of the slurry dehydrating and drying step S800. This stage is a stage in which the dewatered cake is conveyed to the relay conveyor 3. At this stage, the dewatered cake generated by the slurry dewatering and drying means 400 is transported to the relay conveyor 3 by the slurry pump 301 or a transport mechanism 304 including an air transport mechanism (not shown). At this stage, the dewatering cake / dried cake is discharged and processed on the relay conveyor 3 by the slurry pump 301 or air conveyance (not shown) with the discharge valve 303 opened, and a special conveyance mechanism dedicated to the dehydration cake is also provided. The equipment effect that it is not necessary is obtained, and the total manufacturing cost and installation cost of the conveyor return belt cleaning system can be reduced.

[Dehydrated filtrate reflux stage S1000]
In the present embodiment, a dehydrated filtrate reflux stage S1000 is included as the next stage of the slurry dehydration drying stage S800. This stage is a stage in which the filtrate discharged from the slurry dehydrating and drying apparatus 400 is refluxed from the filtrate inlet 71 to the raw water tank 50 through the filtrate reflux path 470. The washing system combining the water purification units 100 and 101, which are water filtration devices, and the slurry dehydrating and drying device 400 clarifies and reuses the turbid water generated by high-pressure nozzle washing, while discharging the filtrate after solid-liquid separation by filtration of the slurry. In this stage, the filtrate is also collected in the raw water tank 50 and returned to the water purification units 100 and 101 again. In this case, the loss of water is limited to the dissipation to the atmosphere by evaporation, and the effect of high water use efficiency is obtained.

  The embodiment according to the present invention has been described above, but the present invention is not limited to the embodiment, and various modifications can be made without departing from the spirit of the present invention. One or more water purification units may be added according to the processing capacity, or two or more water purification units may be installed and one of them is used as a stand-by unit by parallel processing, and one unit is also used during filter maintenance. It is a configuration that is advantageous for continuous operation of the conveyor return belt cleaning device.

  The slurry dewatering / drying means may be composed of individual casings with these functions separated, even if the dewatering and drying means are not integrated as shown in one embodiment of the present invention.

  The effects of the invention taken up here are not limited to appearing in one embodiment at the same time, and it is sufficient that even a part of them is manifested to achieve the object of the invention product. It will be easy to judge.

  INDUSTRIAL APPLICABILITY The present invention can be used for a cleaning device system for a return belt surface in which deposits of particles such as earth and sand, coal, ore are present in belt conveyor transportation.

DESCRIPTION OF SYMBOLS 1 Conveyor return belt washing | cleaning apparatus 2 Conveyor conveyor 3 Relay conveyor 4 Powder body 9 Conveyor return belt 11 Washing water high pressure injection nozzle 15 Water receiving member 17 Scraper 33 Muddy water outlet 39 Pipe line 50 Raw water tank 51 Raw water tank container 61 Inlet of raw water tank 62 Raw water tank outlet pump 63 High concentration slurry outlet 71 Filtrate inlet 100, 101 Water purification unit 110 Filter 111 Water filtration container 113 of water purification unit 113 Slurry outlet 118 Injection nozzle 119 Raw water inlet 120 Valve 121 Purified water outlet 122 Outlet valve 130 Motor 154 Slurry line 190 Pipe line 201 Filter unit 204 High-concentration slurry line 210 Filter 211 Water filtration container 220 of filter unit Filter unit inlet 231 Fresh water outlet 240 Pump 250 Washing water reflux water path 260 High-pressure pump 261 Inverter 301 Slurry pump 304 Dehydration cake passage / powder granule reflux passage 400 Slurry dehydration drying means 410 Cylindrical body 411 Dehydration drying container 412 Hot air inlet valve 413 Heated gas supply means 420 Slurry inlet 462 Filtrate discharge pipe 470 Filtrate reflux Path 471 Filtrate outlet valve 482 Heated gas outlet 483 Exhaust path 492 Air pressure pipe 493 Compressor 494 Heat source 495 Blower S1 Conveyor return belt washing method S100 High pressure water washing stage S200 Raw water tank precipitation stage S300 Water purification stage S400 Water purification stage S500 Washing water reflux Stage S600 Slurry transfer stage S700 High-concentration slurry pumping stage S800 Slurry dehydration drying stage S900 Dehydrated cake transport stage S1000 Dehydrated filtrate reflux stage

Claims (10)

A conveyor return belt cleaning device for cleaning a conveyor return belt to which powder particles on a conveyor are adhered by washing with water, the following components:
A washing water high pressure spray nozzle;
A water receiving member that is disposed below the conveyor return belt and receives turbid water of cleaning water containing the powder particles;
A raw water tank that is in fluid communication with a pipe line connected to the water receiving member and capable of storing the muddy water flowing down to the water receiving member;
A water purification unit that is in fluid communication with a pipe line connected to the raw water tank and is capable of purifying the raw water in the raw water tank;
A filter unit that is in fluid communication with a pipe line connected to the water purification unit and that can store the purified water purified by the water purification unit and purify the water;
A wash water recirculation channel in fluid communication with fresh water filtered by the filter unit by a conduit capable of recirculating to the wash water high-pressure injection nozzle;
A slurry conduit in fluid communication with a slurry outlet disposed at the bottom of the water purification unit;
Slurry dewatering and drying means in fluid communication with a high concentration slurry conduit connected to a high concentration slurry outlet disposed at the bottom of the raw water tank;
A filtrate reflux path in fluid communication from the slurry dewatering and drying means by a line connected to the raw water tank; and
A passage of the dewatering cake in fluid communication from the slurry dewatering and drying means to the upper side of the relay conveyor;
Conveyor return belt cleaning device.   The conveyor return belt cleaning apparatus according to claim 1, wherein the fresh water filtered by the filter unit has a suspended solid content concentration of 1 mg / L or less.   The conveyor return belt cleaning according to claim 1 or 2, wherein the cleaning water high-pressure jet nozzle is a high-pressure water nozzle within a nozzle pressure range of 8 to 11 MPa and includes a high-pressure pump capable of supplying the nozzle pressure at a predetermined flow rate. apparatus. The water purification unit includes a water filtration container and the following components in the water filtration container:
A water filtration filter;
A filter cleaning nozzle disposed opposite the water filtration filter;
A slurry outlet disposed at the bottom of the water filtration vessel;
The slurry tube is capable of discharging deposits on the surface of the filter washed away by the washing liquid jet from the filter washing nozzle as a slurry together with the raw water from the slurry outlet, and in fluid communication with the slurry outlet. The conveyor return belt cleaning device according to any one of claims 1 to 3, which is transportable to the raw water tank through a path. A high-pressure cleaning method for a conveyor return belt using the conveyor return belt cleaning device according to any one of claims 1 to 4, wherein the cleaning water high-pressure spray nozzle is: Injection conditions:
Nozzle pressure 8-11 MPa;
Nozzle water volume per nozzle 20 to 23 L / min;
Nozzle distance 200-400 mm;
Nozzle angle 50-60 °, and;
Cleaning width per nozzle 220 mm to 250 mm;
A high pressure cleaning method for a conveyor return belt for high pressure water washing according to spraying conditions including:   The preventive maintenance method of the conveyor using the conveyor return belt cleaning apparatus of any one of Claims 1-4 which acquires the laser camera image of the conveyor surface after washing | cleaning, and test | inspects the micro laceration which arose on the conveyor surface. A method for cleaning a conveyor return belt, in which a conveyor return belt to which powder particles on a conveyor are attached is washed with water, and includes the following:
A high pressure water washing step S100 for washing the conveyor return belt with high pressure water by means of a washing water high pressure spray nozzle;
Raw water tank precipitation stage S200 for receiving turbid water containing washing powder containing the granular material below the conveyor return belt, storing the turbid water flowing down, and precipitating raw water content in the raw water tank;
In fluid communication with said raw water tank and pipe line, receiving raw water of the raw water tank, the raw water and water purification the raw water in the water purification unit having a filter for filtering, combined, the raw water to the filtration surface of the filter On the other hand, a water purification step S300 that sprays as a cleaning fluid and deposits accumulated on the filtration surface of the filter to the bottom of the water purification unit to generate a slurry at the bottom of the water purification unit;
A water purification step S400 for receiving purified water from the water purification unit and purifying with a filter unit;
A washing water refluxing step S500 for refluxing the fresh water filtered by the filter unit to the washing water high-pressure injection nozzle;
The slurry at the bottom of the container of the water purification unit generated in the water purification step S300 is transferred to the raw water tank by a slurry pipe connected to the slurry outlet disposed at the bottom of the water purification unit. Returning to the bottom of the container, slurry transfer step S600 step;
A high-concentration slurry outlet disposed at the bottom of the raw water tank and a high-concentration slurry pipe that is connected to the high-concentration slurry outlet, and a high-concentration slurry that is precipitated in the raw water tank are pumped to the slurry dewatering and drying means Concentration slurry pumping step S700;
A slurry dehydration drying step S800 for dehydrating and drying the high concentration slurry by the slurry dehydration drying means;
A dewatering cake transporting step S900 for transporting the dewatered and dried cake from the slurry dewatering and drying means to the upper side of the relay conveyor using the path of the dewatered and dried cake; and
A dehydrated filtrate refluxing step S1000 for refluxing the filtrate from the slurry dehydrating and drying means to the raw water tank by a pipe line connected to the raw water tank;
Conveyor return belt cleaning method.   The method for cleaning a conveyor return belt according to claim 7, wherein the conveyor return belt cleaning device according to any one of claims 1 to 4 is used. The conveyor return belt cleaning apparatus according to any one of claims 1 to 4, which can be maintained from the outside only by replenishing steam lost by the slurry dehydrating and drying means and supplying operating power . 9. The method of cleaning a conveyor return belt according to claim 5, 7 or 8, wherein the method can be sustained from the outside only by replenishing steam lost by the slurry dehydrating and drying means and supplying operating power .

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