Device for preventing foam of thickener from overflowing

Abstract

The utility model discloses a thickener foam overflow prevention device which comprises a thickener body and an overflow weir, an inverted-U-shaped pipe is arranged on the side wall of the overflow weir in a penetrating mode, one end of the inverted-U-shaped pipe is located outside the overflow weir, the other end of the inverted-U-shaped pipe is located inside the overflow weir, and the length of the inverted-U-shaped pipe is larger than that of one end of the inverted-U-shaped pipe. A water suction pump is installed on the side wall of the other end of the inverted-U-shaped pipe, a plurality of fixing blocks are fixedly connected to the inner wall of the other end of the inverted-U-shaped pipe, the fixing blocks are connected with an annular support matched with the inner wall of the other end of the inverted-U-shaped pipe through elastic connecting pieces, and a blocking block matched with the inner wall of the other end of the inverted-U-shaped pipe is fixedly connected to the bottom of the annular support. The inner side wall of the overflow weir is fixedly connected with a liquid level meter higher than the bottom of the other end of the inverted-U-shaped pipe, and a vertical overflow channel is formed in the bottom of the overflow weir. The device has the advantages of being simple in structure, efficient, convenient and capable of avoiding loss of concentrate products.

Description

Technical Field

[0001] The utility model relates to the application field of thickeners, in particular to a device for preventing thickener foam from overflowing. Background Art

[0002] In modern industrial production sites, thickeners are commonly used slurry material dehydration devices, generally including a tank body, a central tube and a bridge. Their advantages are small footprint, high concentration efficiency, simple structure, and easy operation. For mining companies that use foam flotation technology, a problem faced by their thickeners when using them is that foam on the thickener surface is easy to accumulate, and it takes a long time to eliminate it naturally. When the accumulation is serious, it will cause a large amount of concentrate product loss. Therefore, many mining companies will use the method of adding defoaming agents to eliminate foam. The disadvantages of this method include increasing production costs, affecting the quality of concentrate products and the dehydration operation of the next process; or using a serrated overflow weir baffle to block the foam, but when the foam accumulation is serious, some concentrate foam will still overflow from the overflow weir and cause metal loss.

[0003] Chinese invention patent publication number CN111265917A discloses a device for preventing the overflow of suspended foam in a thickener, including a defoaming device, a bracket, a track groove, and a driving motor; the defoaming device is fixed on the bracket and is placed horizontally between the central axis of the thickener and the rib of the thickener clarifier tank through the bracket, one end of the bracket is rotatably connected to the central axis of the thickener, and the other end is equipped with a track wheel, which is connected to a driving motor, and the driving motor drives the track wheel to drive the bracket to rotate around the central axis of the thickener; it can prevent the accumulation and overflow of suspended foam in the thickener. The device has a complex structure, high maintenance cost, and cannot fundamentally solve the problem.

[0004] Another example is China's invention patent publication number CN117717809A, which discloses a suspended foam processing device for a thickener, including a thickener body, a foam guide mechanism and a power mechanism are provided on the thickener body, a processing mechanism and a feeding mechanism are provided on the power mechanism; the processing mechanism includes a mounting tube, a spiral plate is provided on the outside of the mounting tube, convex thorns are provided on the spiral plate, and the pitch of the spiral plate gradually decreases from top to bottom; the feeding mechanism includes a feeding barrel, the spiral plate is located inside the feeding barrel, a crushing net is provided at the bottom of the feeding barrel, and a feeding pipe is provided on the feeding barrel. This device avoids foam overflow by eliminating foam, and it also has the problem of complex structure, high maintenance cost, and cannot fundamentally solve the problem. Utility Model Content

[0005] The technical problem to be solved by the utility model is that the existing suspended foam processing device for thickeners adopts a mechanical structure to eliminate foam, which cannot fundamentally solve the problem. Therefore, a device to prevent thickener foam from overflowing is provided.

[0006] The technical solution of the utility model is: a device for preventing thickener foam from overflowing, comprising a thickener body and an overflow weir, an inverted U-shaped tube is penetrated through the side wall of the overflow weir, one end of the inverted U-shaped tube is located outside the overflow weir, and the other end of the inverted U-shaped tube is located inside the overflow weir and its length is greater than one end of the inverted U-shaped tube, a water pump is installed on the side wall of the other end of the inverted U-shaped tube, a plurality of fixed blocks are fixedly connected to the inner wall of the other end of the inverted U-shaped tube, the fixed block is connected to an annular bracket adapted to the inner wall of the other end of the inverted U-shaped tube through an elastic connecting piece, a blocking block adapted to the inner wall of the other end of the inverted U-shaped tube is fixedly connected to the bottom of the annular bracket, a liquid level gauge higher than the bottom of the other end of the inverted U-shaped tube is fixedly connected to the inner side wall of the overflow weir, a vertical overflow channel is opened at the bottom of the overflow weir, and an electromagnetic valve connected to the signal of the liquid level gauge is installed in the vertical overflow channel.

[0007] An improvement of the above solution is that the top of the vertical overflow channel is connected to an overflow pipe.

[0008] The overflow pipe in the above solution is located below the other end of the inverted U-shaped pipe.

[0009] A further improvement of the above solution is that a plurality of defoaming water pipes are provided on the top edge of the thickener body, and the water outlets of the defoaming water pipes are oriented toward the center of the thickener body.

[0010] The water outlet of the defoaming water pipe in the above scheme is flat.

[0011] A further improvement of the above scheme is that the defoaming water pipe is equipped with a valve.

[0012] The highest point of the other end of the inverted U-shaped tube in the above scheme is 50-100 mm lower than the slurry level.

[0013] The method for using the anti-thickener foam overflow device comprises the following steps: the inverted U-shaped tube is located below the slurry level in the thickener as a whole, the block closes the other end of the inverted U-shaped tube, the water pump is started, the slurry enters from one end of the inverted U-shaped tube and fills the inverted U-shaped tube, thereby pushing the block down, the elastic connecting piece is stretched, the block is separated from the other end of the inverted U-shaped tube, the solenoid valve is opened, the slurry enters the overflow weir from the vertical overflow channel, as the liquid level in the overflow weir rises to immerse the other end of the inverted U-shaped tube, the liquid level meter sends a signal to the solenoid valve to close the vertical overflow channel, thereby forming a siphon inside and outside the overflow weir through the inverted U-shaped tube, and preventing the foam on the slurry surface in the thickener from overflowing into the overflow weir.

[0014] The beneficial effect of the utility model is that through the cooperation of the inverted U-shaped tube and the water pump, the inverted U-shaped tube is filled with liquid, and then the slurry is injected into the overflow weir until the other end of the inverted U-shaped tube is immersed therein, forming a siphon effect, and continuously sucking the slurry in the thickener into the overflow weir, avoiding the slurry level in the thickener being higher than the overflow weir and thus overflowing, thereby reducing the loss of concentrate products. The utility model has a simple structure, is highly efficient and convenient, and can avoid the loss of concentrate products; it has few consumables and low later maintenance costs; it is simple and easy to use, easy to manage, and easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the thickener foam overflow prevention device of the utility model;

[0016] Figure 2 yes Figure 1 The enlarged schematic diagram at A in the middle;

[0017] Figure 3 yes Figure 2 Schematic diagram of the three-dimensional structure;

[0018] In the figure, 1. thickener body, 2. overflow weir, 3. inverted U-shaped pipe, 4. water pump, 5. fixing block, 6. elastic connecting piece, 7. annular bracket, 8. blocking block, 9. liquid level meter, 10. vertical overflow channel, 11. overflow pipe, 12. defoaming water pipe. DETAILED DESCRIPTION

[0019] The technical scheme of the utility model is described clearly and completely below in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments by ordinary technicians in this field without creative work are within the protection scope of the utility model.

[0020] like Figure 1-3As shown, the anti-thickener foam overflow device includes a thickener body 1 and an overflow weir 2. The overflow weir includes a side wall and a bottom, and is built around the edge of the thickener. An inverted U-shaped tube 3 is passed through the side wall of the overflow weir. One end of the inverted U-shaped tube is located outside the overflow weir, and the other end of the inverted U-shaped tube is located inside the overflow weir and its length is greater than one end of the inverted U-shaped tube. When the thickener is working normally and filled with slurry, the lowest point of one end of the inverted U-shaped tube is 30-50 mm higher than the lowest point of one end of the inverted U-shaped tube, and the highest point of the other end of the inverted U-shaped tube is 50-100 mm lower than the slurry level. A water pump 4 is installed on the side wall of the other end of the inverted U-shaped tube, and a plurality of fixed blocks 5 are fixedly connected to the inner wall of the other end of the inverted U-shaped tube. The fixed block is connected to an annular bracket 7 adapted to the inner wall of the other end of the inverted U-shaped tube through an elastic connector 6. A blocking block 8 adapted to the inner wall of the other end of the inverted U-shaped tube is fixedly connected to the bottom of the annular bracket. Specifically, the annular bracket can be connected to the blocking block through a plurality of connecting rods. The connecting rod can be vertical. In order to avoid friction between the vertical connecting rod and the inner wall of the inverted U-shaped tube, the connecting rod is preferably designed to be an inwardly raised arc. A liquid level gauge 9 higher than the bottom of the other end of the inverted U-shaped tube is fixedly connected to the inner wall of the overflow weir. A vertical overflow channel 10 is opened at the bottom of the overflow weir. An electromagnetic valve connected to the liquid level gauge signal is installed in the vertical overflow channel.

[0021] The inverted U-shaped tube is made of stainless steel to ensure its service life. Such an inverted U-shaped tube can be arranged on multiple side walls of the annular overflow weir, and multiple matching vertical overflow channels are also arranged at the bottom of the overflow weir. The specific diameter and number of the inverted U-shaped tubes need to be determined according to the size and working conditions of the thickener, but in principle, the drainage capacity of the inverted U-shaped tube is more than twice the feeding capacity of the thickener.

[0022] As a preferred example of the utility model, a plurality of defoaming water pipes 12 are provided at the top edge of the thickener body, the outlets of the defoaming water pipes are oriented toward the center of the thickener body, and valves are provided on the defoaming water pipes to timely control the number of defoaming water pipes opened and adjust the flushing pressure of the defoaming water. The defoaming water pipes form a fan-shaped impact water flow to achieve external force to destroy the foam stability and concentrate the foam near the center of the thickener without scattering around.

[0023] As a preferred example of the utility model, the top of the vertical overflow channel is connected with an overflow pipe 11, which can be in the shape of an outwardly expanding trumpet mouth to increase the flow rate of the liquid. The overflow pipe can be located at any position at the bottom of the overflow weir, but is preferably located below the other end of the inverted U-shaped pipe. When the block drops to a certain height, the overflow pipe can drag the block to play a role of limiting. At the same time, when the solenoid valve fails, the block can also play a role of blocking the vertical overflow channel.

[0024] The method for using the device to prevent thickener foam overflow comprises the following steps: the inverted U-shaped tube is located below the slurry level in the thickener as a whole, and there is foam above the slurry surface; a block closes the other end of the inverted U-shaped tube, and the water pump is started; the supernatant in the slurry enters from one end of the inverted U-shaped tube and fills the inverted U-shaped tube, thereby pushing the block down; the elastic connecting piece is stretched, and the block is separated from the other end of the inverted U-shaped tube; the solenoid valve is opened, and the slurry enters the overflow weir from the vertical overflow channel; as the liquid level in the overflow weir rises to immerse the other end of the inverted U-shaped tube, the liquid level meter sends a signal to the solenoid valve to close the vertical overflow channel, and a siphon is formed inside and outside the overflow weir through the inverted U-shaped tube to prevent the foam on the slurry surface in the thickener from overflowing into the overflow weir.

Claims

1. A thickener foam overflow prevention device, comprising a thickener body (1) and an overflow weir (2), wherein: An inverted U-shaped tube (3) is penetrated through the side wall of the overflow weir, one end of the inverted U-shaped tube is located outside the overflow weir, the other end of the inverted U-shaped tube is located inside the overflow weir and its length is greater than that of the one end of the inverted U-shaped tube, a water pump (4) is installed on the side wall of the other end of the inverted U-shaped tube, a plurality of fixed blocks (5) are fixedly connected to the inner wall of the other end of the inverted U-shaped tube, the fixed blocks are connected to an annular bracket (7) adapted to the inner wall of the other end of the inverted U-shaped tube through an elastic connecting piece (6), a blocking block (8) adapted to the inner wall of the other end of the inverted U-shaped tube is fixedly connected to the bottom of the annular bracket, a liquid level meter (9) higher than the bottom of the other end of the inverted U-shaped tube is fixedly connected to the inner wall of the overflow weir, a vertical overflow channel (10) is opened at the bottom of the overflow weir, and an electromagnetic valve connected to the signal of the liquid level meter is installed in the vertical overflow channel.

2. The device for preventing thickener foam overflow as claimed in claim 1, characterized in that: The top of the vertical overflow channel is connected to an overflow pipe (11).

3. The device for preventing thickener foam overflow as claimed in claim 2, characterized in that: The overflow pipe is located below the other end of the inverted U-shaped pipe.

4. The device for preventing thickener foam overflow as claimed in claim 1, characterized in that: A plurality of defoaming water pipes (12) are provided on the top edge of the thickener body, and the water outlets of the defoaming water pipes are oriented toward the center of the thickener body.

5. The device for preventing thickener foam overflow as claimed in claim 4, characterized in that: The water outlet of the defoaming water pipe is flat.

6. The device for preventing thickener foam overflow as claimed in claim 4, characterized in that: The defoaming water pipe is equipped with a valve.

7. The device for preventing thickener foam overflow as claimed in claim 1, characterized in that: The highest point of the other end of the inverted U-shaped tube is 50-100 mm lower than the slurry level.

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