CN104368434A - Sand washing machine with fine sand recovering and rewashing function and obtaining method thereof - Google Patents

Abstract

The invention discloses a sand washing machine with the function of recovering and rewashing fine sand and its realization method. A water collecting tank is connected to the water outlet of the sand washing machine, and a water dividing tank is arranged on the upper part of the water collecting tank, which is separated from the water collecting tank. The bottom of the water tank is provided with a communication port connected to the sump, and a diverter valve is arranged in the communication port, a clear water discharge port is provided on the upper side wall of the water diversion tank, and a hydrocyclone is set up on the outer side wall of the water diversion tank near the upper position, and the water collection tank There is a sewage pump at the bottom, the sewage pump is connected to the water inlet of the hydrocyclone through a conduit, the clean water outlet of the hydrocyclone is connected to the top of the water separation tank through the conduit, and the concentrated liquid outlet of the hydrocyclone is connected to the water through the conduit The feed port of the sand washing machine. The invention adds a fine sand recovery system on the basis of the sand washing machine, which can effectively improve the gradation of the finished sand, increase the output, and greatly reduce the content of particulate matter in the discharged sewage, reducing the pollution pressure on the environment.

Description

A sand washing machine with the function of recovering and washing fine sand and its realization method

the

technical field

The invention relates to the technical field of sand washing machines, in particular to a sand washing machine with the function of recovering and washing fine sand and its realization method.

the

Background technique

The sand washing machine is a machine that rinses out the mud powder (particles smaller than 75 microns) contained in the sand by gravity flotation, fishes out the sand and effectively dehydrates it to a certain location.

At present, the common sand washing machines are bucket wheel type, chain plate bucket type, spiral type and so on. As shown in Fig. 1 and Fig. 2, a bucket-wheel sand washing machine described in the patent 201320597916.0 is mainly composed of a grit chamber 1, a power system 2, a bucket wheel 3, and a drain 4. The basic principle is that the screened sand is washed into the front of the grit chamber 1 of the sand washing machine with a large amount of water, and the rear of the grit chamber 1 is provided with a drainage port 4, and the sand is driven by the water flow in the grit chamber. The tank 1 moves from the front to the rear. During this process, the sand sinks into the bottom of the grit chamber 1 under the action of gravity, and the fine mud powder contained in the sand is rinsed out from the drain 4 under the drive of the water flow. , the power system 2 drives the bucket wheel 3 to rotate slowly according to the direction shown in the figure to pick up the sand sunken into the bottom of the grit chamber 1, and the bottom of the bucket wheel 3 is a screen with holes to effectively drain the water in the picked up sand Filter out, the bucket wheel 3 unloads the finished sand after desilting and filtering out the water outside the tail of the grit chamber 1 (generally picked up by the conveyor belt).

In sand washing production, it is difficult to control the non-uniform mud content of sand materials and the precise follow-up control of water consumption. Therefore, while the mud powder less than 75 microns is washed away, some fine sand will also be discharged from the outlet 4. Expelled and lost. The flow process of the grit chamber 1 is short and the water flow is large, so the amount of fine sand discharged will be more. The loss of fine sand will make the fineness modulus of the finished sand coarser and the gradation worse, and at the same time increase the content of particulate matter in the discharged water to form sedimentation and pollution.

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Contents of the invention

The purpose of the present invention is to solve the technical problem that the fine sand discharged from the discharge port of the sand washing machine cannot be recovered and washed again, and to provide a simple structure and process, convenient manufacturing and matching, which can effectively improve the gradation of the finished sand, increase the output, and greatly improve the quality of the sand. The invention discloses a sand washing machine with the function of recovering and washing fine sand and a realization method thereof, which reduces the particle content in discharged sewage and reduces the pressure on environmental pollution.

In order to achieve the above objectives, the present invention is achieved through the following technical solutions: a sand washing machine with the function of recovering and rewashing fine sand, including a sand washing machine, characterized in that the water outlet of the sand washing machine is connected with a A water collection tank, the upper part of the water collection tank is provided with a water distribution tank isolated from it, the bottom of the water distribution tank is provided with a communication port connected to the water collection tank, and a diverter valve is arranged in the communication port, and the upper part of the water distribution tank There is a clean water outlet on the side wall, a hydrocyclone is set up on the outer wall of the water distribution tank near the upper part, and a sewage pump is provided at the bottom of the sump, and the sewage pump is connected to the hydrocyclone through a conduit. The water inlet of the hydrocyclone is connected, the clear water outlet of the hydrocyclone is connected to the top of the water separation tank through a conduit, and the concentrated solution outlet of the hydrocyclone is connected to the feed port of the sand washing machine through a conduit .

On the basis of the bucket wheel sand washing machine, the present invention designs and adds a fine sand recovery system to form a sand washing machine with a fine sand recovery function, which can effectively recover fine sand larger than 100 microns (about 80-90% recovery rate). The gradation of the finished sand increases the output, greatly reduces the particulate matter content in the discharged sewage, and reduces the pollution pressure on the environment.

As a preference, the hydrocyclone includes a swirl casing, and the swirl casing has a separation chamber composed of a cylindrical section inner cavity and a conical section inner cavity connected up and down, and the hydrocyclone's The water inlet is arranged on the side of the inner cavity of the cylindrical section and is tangent to the side wall, the clear water outlet of the hydrocyclone is arranged on the top of the inner cavity of the cylindrical section, and the concentrated liquid of the hydrocyclone The discharge port is arranged at the bottom of the inner chamber of the conical section.

The core component of the hydrocyclone is the inner cavity of the conical section. The whole cyclone is made of steel plate or other wear-resistant materials. Under the pressure of the pump, the sewage to be treated is moved from the tangential direction at a high speed (recommended 5-12 m/s). The sewage entering the hydrocyclone rotates at a high speed along the wall of the hydrocyclone. Under the action of centrifugal force, the solid particles are thrown to the wall of the cyclone, and under the action of the friction force of the wall of the cyclone, its own gravity and the water flow, the solid particles drop down to the concentrated liquid slag outlet at the conical bottom with the swirling flow. out from here. Due to the high-speed rotation of sewage along the wall of the device, a low pressure is formed in the center of the hydrocyclone, and the treated clear liquid forms a spiral upward secondary spiral flow at the axis of the cyclone, and is discharged from the clear liquid outlet in the upper center of the cyclone. When discharged, the clear liquid outlet should be connected to the atmosphere to prevent siphoning.

Preferably, the sand washing machine is a bucket wheel sand washing machine, and its structure is composed of a grit chamber, a power system, a bucket wheel, a feed port and a discharge port, wherein the bottom of the bucket wheel is a screen with holes.

Of course, the sand washing machine can also choose the chain plate bucket type and the spiral type, but from the structural point of view, the structural transformation of the bucket wheel type is easier.

Preferably, the water collecting tank and the grit chamber are connected in one piece.

It makes the fine sand recovery and washing system more closely combined with the sand washing machine, which is more convenient for unified management.

A method for recovering and rewashing fine sand based on the above-mentioned sand washing machine, comprising the following steps:

(1) The screened sand is washed into the feed port at the front of the grit chamber of the sand washer along with a large amount of water, and the sand moves from the front to the rear of the grit chamber under the drive of the water flow. The medium sand sinks into the bottom of the grit chamber under the action of gravity, and the fine mud powder contained in the sand is rinsed out from the drain outlet and enters the sump under the drive of the water flow. The sand at the bottom of the tank is picked up, and the bottom of the bucket wheel is a screen with holes to effectively filter out the water in the picked up sand. The bucket wheel unloads the finished sand after desliming and filtered water at the tail of the grit chamber The outside is picked up by the conveyor belt;

(2) The sewage after rinsing will be discharged from the outlet to the sump with some fine sand at the same time, and the sewage will be sent to the hydrocyclone at a high flow rate through the sewage pump, and the sewage will make a fast spiral in the hydrocyclone Movement, the fine sand particles contact the inner wall of the hydrocyclone under the action of centrifugal force, and are subjected to the frictional resistance of the inner wall of the hydrocyclone, spirally settle along the inner wall of the hydrocyclone to the bottom of the cone of the hydrocyclone, and together with a little water Together, they are discharged from the outlet of the concentrate at the bottom of the cone of the hydrocyclone to the feed port at the front of the grit chamber. These fine sands are scooped up together with other finished sands by the bucket wheel and become a part of the finished sand, which is also unloaded by the bucket wheel. The outside of the tail of the grit chamber is picked up by the conveyor belt, and the clean water separated from the fine sand particles in the hydrocyclone is discharged from the clean water outlet on the top of the hydrocyclone into the water diversion tank, and a small part of the clean water is regulated by the diverter valve. To the sump, it is recirculated in the fine sand recovery system, and the rest of the clean water treated by the hydrocyclone is discharged from the clean water drain.

As a preference, in step 2, the sewage is sent into the hydrocyclone at a relatively high flow rate through the sewage pump, and the flow rate is preferably 5-12 m/s.

Beneficial effects: (1) The invention has a simple structure, standard products are available for the sewage pump and the hydrocyclone, the process is simple and practical, and the production and matching are convenient.

(2) The combination of the sand washing machine and the fine sand recovery and rewashing system is convenient. The sand washing machine can be used alone or in combination, especially the existing sand washing machine can be easily upgraded.

(3) The sand washing machine and the fine sand recovery and rewashing system are arranged next to each other, with a compact structure and a small footprint.

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Description of drawings

Fig. 1 is the structural representation of prior art conventional sand washing machine;

Fig. 2 is the top view of Fig. 1;

Fig. 3 is the structural representation of sand washing machine after the modification of the present invention;

Fig. 4 is the top view of Fig. 3;

Fig. 5 is the left view of Fig. 3;

Fig. 6 is a structural sectional view of A-A in Fig. 4;

Fig. 7 is a schematic structural view of the hydrocyclone of the present invention.

In the figure: 1-grit chamber, 2-power system, 3-bucket wheel, 4-drainage port, 5-hydrocyclone, 6-clear water discharge port, 7-water diversion tank, 8-diverter valve, 9-sewage Pump, 10-water collection tank, 51-water inlet, 52-clean water outlet, 53-concentrated solution outlet.

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Detailed ways

In order to make the technical means, creative features and objectives of the present invention easy to understand, the present invention is further described below in conjunction with specific embodiments.

Embodiment: As shown in Figure 3 and Figure 4, it is a φ2600×800 bucket wheel sand washing machine with fine sand recovery function, including a settling tank 1, power system 2, bucket wheel 3, and drainage port 4 , Hydrocyclone 5, clear water outlet 6, water diversion tank 7, diverter valve 8, sewage pump 9, water collection tank 10 and conduit pipeline, etc. Grit sink 1, power system 2, bucket wheel 3, and drain 4 form a bucket wheel sand washing machine, hydrocyclone 5, clean water drain 6, water diversion tank 7, diverter valve 8, sewage pump 9, water collection tank 10 The fine sand recovery system is composed of conduits and pipelines. The fine sand recovery system is integrated with the bucket wheel sand washing machine through the integral connection structure of the water collection tank 10 and the grit chamber 1 .

As shown in Figure 7, the hydrocyclone 5 includes a swirl casing, and the swirl casing has a separation chamber formed by connecting the inner chamber of the cylindrical section and the inner chamber of the conical section up and down, and the inlet of the hydrocyclone 5 The water outlet 51 is arranged on the side of the inner chamber of the cylindrical section and is tangent to the side wall, the clear water outlet 52 of the hydrocyclone 5 is arranged on the top of the inner chamber of the cylindrical section, and the concentrated liquid outlet 53 of the hydrocyclone 5 is arranged on the The bottom of the inner cavity of the conical segment.

As shown in Figures 5 and 6, the water distribution tank 7 is arranged on the upper part of the water collection tank 10, and the two are separated by the partition plate at the bottom of the water distribution tank 7. The clean water outlet 6 is arranged on the upper part of the water distribution tank 7, and the diverter valve 8 is provided. In the communication port at the bottom of the water distribution tank 7, the outlet of the communication port leads to the sump 10, the sewage pump 9 is placed at the bottom of the sump 10, the hydrocyclone 5 is hung on the upper part of the side of the water distribution tank 7, and the lower part of the hydrocyclone 5 concentrates The liquid outlet 53 is higher than the grit chamber 1, and is connected to the feed port of the grit chamber 1 through a conduit so that the concentrated liquid can flow to the grit chamber 1 by itself, and the water outlet of the sewage pump 9 is connected with the hydrocyclone 5 The water inlet 51 of the hydrocyclone 5 is connected to each other, the clear water outlet 52 of the hydrocyclone 5 is connected to the top of the water distribution tank 7 with a conduit, the drain 4 is placed on the rear side of the grit chamber 1, and the sump 10 just catches the drainage of the drain 4 , The bucket wheel 3 is installed on the grit chamber 1 and is driven to rotate by the power system 2. The power system 2 is composed of a drive motor, a gearbox and a gear box. Wherein the bottom of the bucket wheel 3 is a screen cloth with holes.

Wherein the water dividing tank 7 is placed on the sump 10 so as to return to clear water. The diverter valve 8 is placed at the bottom of the water diversion tank 7 so as to return clear water. The clear water outlet is placed in the upper half of the water dividing tank 7 so as to return clear water and drain clear water.

The realization method of fine sand recovery and rewashing: (1) The screened sand is washed into the feed port at the front of the grit chamber of the sand washer along with a large amount of water, and the sand is driven by the water flow from the front of the grit chamber Moving to the rear, during this process, the sand sinks into the bottom of the grit chamber under the action of gravity, and the fine mud powder contained in the sand is rinsed out from the drain outlet into the sump under the drive of the water flow, and the power system drives the bucket wheel Rotate slowly to pick up the sand that sinks into the bottom of the grit chamber. The bottom of the bucket wheel is a screen with holes to effectively filter out the water in the picked up sand. The bucket wheel removes the mud and filters out the water. The finished sand is unloaded outside the tail of the grit chamber and picked up by the conveyor belt;

(2) The sewage after rinsing will be discharged from the outlet to the sump with some fine sand at the same time, and the sewage will be sent to the hydrocyclone at a relatively high flow rate (recommended 5-12 m/s) by the sewage pump. Rapid spiral motion in the hydrocyclone, the fine sand particles contact the inner wall of the hydrocyclone under the action of centrifugal force, and are subjected to the frictional resistance of the inner wall of the hydrocyclone, and settle spirally along the inner wall of the hydrocyclone to the hydrocyclone. Cone bottom of the device, and together with a little water, it is discharged from the outlet of the concentrated solution at the bottom of the hydrocyclone cone to the feed port at the front of the grit chamber. The fine sand is picked up by the bucket wheel together with other finished sand to become finished sand. A part of the grit chamber is also unloaded by the bucket wheel outside the tail of the grit chamber and picked up by the conveyor belt. The clean water separated from the fine sand particles in the hydrocyclone is discharged from the top clean water outlet of the hydrocyclone into the water separation tank. A small part of clean water is adjusted back to the sump by the diverter valve, and recirculated in the fine sand recovery system (because the processing capacity of the usually selected hydrocyclone and the flow rate of the sewage pump should be greater than the maximum sewage discharge of the sand washing machine, In order to prevent the sewage pump from being sucked, part of the treated clean water needs to be returned to the sump), and the rest of the clean water treated by the hydrocyclone is discharged from the clean water outlet.

The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the industry should understand that the present invention is not limited by the above-mentioned embodiments, and that described in the above-mentioned embodiments and the description only illustrates the principles of the present invention, and the present invention also has various aspects without departing from the spirit and scope of the present invention. Variations and improvements all fall within the scope of the claimed invention. The protection scope of the present invention is defined by the appended claims and their equivalents.

Claims (6)

1. one kind is reclaimed the sand washer washing function again with fine sand, comprise sand washer, it is characterized in that, the delivery port connection of described sand washer is provided with a water leg, the top of described water leg is provided with one and is separated by with it bypass channel left, the bottom of described bypass channel is provided with the connected entrance of the described water leg of a connection, a flow divider is provided with in described connected entrance, the upper side wall of described bypass channel is provided with a clear water discharge outlet, the lateral wall of described bypass channel has set up a hydrocyclone by the upper position, the bottom of described water leg is provided with a sewage pump, described sewage pump is connected by the water inlet of conduit with described hydrocyclone, the Graceful mouth of a river of described hydrocyclone passes into the top of described bypass channel by conduit, the concentrate outlet of described hydrocyclone passes into the charging aperture of described sand washer by conduit.

2. the sand washer washing function with fine sand recovery more according to claim 1, it is characterized in that, described hydrocyclone comprises an eddy flow housing, have one in described eddy flow housing and dock by cylindrical section inner chamber and conical section inner chamber the disengagement chamber formed one on the other, tangent with sidewall on the side that the water inlet of described hydrocyclone is arranged at described cylindrical section inner chamber, the Graceful mouth of a river of described hydrocyclone is arranged at the top of described cylindrical section inner chamber, and the concentrate outlet of described hydrocyclone is arranged at the bottom of described conical section inner chamber.

3. the sand washer washing function with fine sand recovery more according to claim 1 and 2, it is characterized in that, sand washer is bucket wheel formula sand washer, and its structure is made up of riffler, dynamical system, bucket wheel, charging aperture and discharge outlet, and wherein the bottom of bucket wheel is screen cloth with holes.

4. the sand washer washing function with fine sand recovery more according to claim 3, it is characterized in that, water leg and riffler are integral type syndeton.

5. reclaim an implementation method of washing again based on sand washer fine sand described in the claims 4, comprise the following steps:

(1) sand after screening pours the charging aperture of sand washer riffler front portion with a large amount of water, sand is posteriorly moved by front portion under the drive of current in riffler, the bottom of riffler is sunk under gravity at this process medium sand, and be contained in mud powder tiny in sand and go out from discharge outlet rinsing under the drive of current and enter water leg, dynamical system drives bucket wheel slow circumvolve, the sand sunk to bottom riffler is picked up, the bottom of bucket wheel is that screen cloth with holes effectively can filter out the water in the sand picked up, bucket wheel is connect away after desliming and the outside that the finished sand filtering water is discharged at riffler afterbody by conveyer belt,

(2) sewage after rinsing can be with some fine sand to be expelled to water leg from discharge outlet simultaneously, these sewage send into hydrocyclone through sewage pump with higher flow velocity, sewage does screw fast in hydrocyclone, fine sand grain under centrifugal action with hydrocyclone contact internal walls, and be subject to the frictional resistance effect of hydrocyclone inwall, the hydrocyclone cone end is settled down to along hydrocyclone spiral inner wall, and be expelled to the charging aperture of riffler front portion from the concentrate outlet at the hydrocyclone cone end together with a little water, these fine sands are picked up the part becoming finished sand together with other finished sand by bucket wheel, the outside being equally discharged at riffler afterbody by bucket wheel is connect away by conveyer belt, the clear water separating fine sand grain in hydrocyclone then enters bypass channel from the discharge of the Graceful mouth of a river, top of hydrocyclone, the clear water of its small portion regulates through flow divider and is back to water leg, again circulate in fine sand recovery system, all the other clear water after hydrocyclone process are discharged from clear water discharge outlet.

6. sand washer fine sand according to claim 5 reclaims the implementation method of washing again, it is characterized in that, in step 2, sewage sends into hydrocyclone through sewage pump with higher flow velocity, the preferred 5-12 meter per second of this flow velocity.