JPH04110109U - Outlet structure of polluted liquid filtration equipment - Google Patents

Abstract

(57) [Summary] (with amendments) [Purpose] To smooth the movement of filter paper over the discharge port formed in the polluted liquid tank. [Structure] The discharge port structure is composed of a plurality of slits parallel to the moving direction of the filter paper. The filter paper covers the outlet, which is made up of slits, and is moved by a chain when a blockage occurs. At this time, since the direction of the slits substantially coincides with the direction of movement of the filter paper, there are almost no factors that inhibit the movement of the filter paper. Therefore, the filter paper is dragged by the chain due to the drag force caused by the friction generated between the chain and the filter paper, and smoothly moves over the discharge port.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is based on a filter paper that is formed on the bottom plate of a polluted liquid tank and is moved by a chain. The present invention relates to a structure of a discharge port in a polluted liquid filtration device having a covered discharge port.

0002

[Conventional technology]

Conventionally, in this type of polluted liquid filtration device, a discharge port is formed in the bottom plate of the polluted liquid tank. The outlet has a perforated plate with a plurality of holes and is covered with filter paper. Filter paper is generally in the form of a band, and is connected to the circulating chain and the inside surface of the polluted liquid tank. Drag due to friction between the chain and the chain caused by the weight of the chain It can be moved by pulling a chain using force F1 (no In theory, the drag force F1 due to friction is greater than the frictional resistance force F2 between the filter paper and the inner surface of the polluted liquid tank. It is set to become larger. ). Therefore, this polluted liquid filtration device filters the polluted liquid through filter paper and filters it through the holes in the perforated plate. It is designed to be discharged. In addition, when the filter paper of a polluted liquid filtration device becomes clogged, By circulating the chain, the clogged part of the filter paper is sent out of the polluted liquid tank. At the same time, the new part of the filter paper is drawn onto the perforated plate at the outlet, reducing filtration efficiency. is prevented.

0003

[Problem that the idea aims to solve]

However, the discharge port of such a polluted liquid filtration device has the following problems. If the holes in the perforated plate are large, the filter paper will be affected by the pressure difference between the inside and outside of the tank. may bite into the hole, making it difficult to move using only the dragging force F1. others Therefore, a slip phenomenon occurs in which the chain moves but the filter paper does not move, and the filter paper Can be damaged by chains. On the other hand, if the pores are small, the filter paper cannot be used effectively and will clog quickly. ri occurs. If a cutting piece in the polluted liquid gets stuck in the filter paper, the cutting piece will be removed when the filter paper is moved. It may get caught in the holes and tear the filter paper. Therefore, the polluted liquid remains unfiltered. For example, it is discharged from the discharge port and fed into a machine tool for cutting or will interfere with grinding.

0004

[Means to solve the problem]

This invention is based on a filter paper that is formed on the bottom plate of a polluted liquid tank and is moved by a chain. In a polluted liquid filtration device having a covered outlet, the filter paper is moved through the outlet. The above problem can be solved by configuring it with multiple slits parallel to the direction. It is something that

[0005]

[Effect]

The filter paper covers the outlet made of slits, and if it becomes clogged, it will damage the chain. Therefore, it can be moved. At this time, the direction of the slit almost matches the direction of movement of the filter paper. Therefore, there are almost no factors that inhibit the movement of the filter paper. Therefore, the filter paper , the chain is dragged by the drag force caused by the friction between the chain and the filter paper. and move smoothly over the discharge port.

[0006]

【Example】

Hereinafter, embodiments of the present invention will be described based on the drawings. The dirty tank (turbid liquid tank) 11 of the polluted liquid filtration device 10 is, for example, a lathe, a grinder, etc. Dirt containing cutting powder or grinding powder discharged from machine tools such as polishing machines (not shown) The coolant (tainted liquid) is allowed to flow into the tank. Note that the coolant is Regarding liquid, cutting liquid may flow into the tank 11.

[0007] The bottom plate 12 of the dirty tank (hereinafter simply referred to as "tank") 11 has a discharge port. 13 is formed. The discharge port 13 is provided in the direction of movement of the filter paper 30 (arrow in FIG. 1), which will be described later. A plurality of wedge wires 60 are provided parallel to mark A). wedge wire 60 A slit 61 is formed between them. The cross-sectional shape of the wedge wire 60 is triangular. It is. A suction chamber 14 is formed below the discharge port 13. Inside the tank 11 is a flight conveyor chain (hereinafter referred to as It is simply called a "chain." ) 16 are provided. The chain 16 consists of a pair of chains. It spans between prorockets 17 and 18 and is driven by a motor 19, It moves circularly within 11.

[0008] The filter paper 30 is wound into a roll and is placed on the top of the tank 11, with the end of the filter paper 30 being wound into a roll. It is sandwiched between the chain 11 and the chain 16 and covers the discharge port 13. At the top of tank 11 is a clean tank that stores filtered clean coolant C. 31 are provided. The coolant tank 31 is provided with an overflow pipe 34. ing. Between the tank 11 and the clean tank 31, there is a A three-way valve 36, a pressure sensor 33 that detects the pressure inside the suction chamber 14, and a filter are connected to each other. The waste coolant is sent to the clean tank 31 and other machine tools (not shown). A pump 32 is provided. The pump 32 has a discharge port 37 connected to the machine tool. It is. Note that the pressure sensor 33 is installed between the three-way valve 36 and the pump 32. However, it may be provided between the three-way valve 36 and the suction chamber 14.

[0009] Next, the operation will be explained. Dirty coolant D sent from the machine tool flows into the tank 11. The dirty coolant D is pumped through the filter paper 30 and the slit in the suction chamber 14 by the pump 32. The coolant C is passed through the tank 61, becomes clean coolant C, and is sent to the clean tank 31. Sent to the machine. When filtering the dirty coolant D through the filter paper 30, clean coolant D is removed. It becomes runt C.

0010 On the other hand, cutting powder and grinding powder contained in the dirty coolant gradually accumulate on the filter paper 30. , clogging the filter paper 30 and impeding the flow of coolant. During this time, the pump 32 continues the suction operation, so the pressure in the suction chamber 14 is reduced to the pressure in the tank 11. Gradually decrease the power. This state continues and the pressure in the suction chamber 14 reaches a predetermined pressure. When the pressure becomes lower, the pressure sensor 33 senses this and switches the three-way valve 36 to the pump 32. The connection is switched from the connection with the suction chamber 14 to the connection between the pump 32 and the clean tank 31. let By switching the three-way valve 36, the clean coolant in the suction chamber 14 is sucked out. It no longer accumulates in the suction chamber 14. That is, the flow between the pump 32 and the suction chamber 14 can be stopped. Therefore, the pressure inside the suction chamber 14 returns to the original predetermined pressure, and the suction chamber 14 returns to its original predetermined pressure. The adsorption force of the filter paper 30 to the chain 14 is reduced, and the clogged part of the filter paper is removed by the chain 16. moved by The weight of the chain 16 is applied to the filter paper 30, and the chain The chain 16 absorbs the drag force F1 caused by friction between the chain 16 and the filter paper 30. The filter paper 30 is pulled and moved by using the filter paper 30. Of course, the drag force F1 is the difference between the filter paper 30 and the tank. 11 is set to be larger than the frictional resistance force F2.

[0011] In this way, the clogged part of the filter paper is removed from the discharge port 13 to the rising wall 40 of the tank 31. and is discharged outside the tank 11. During this time, the pump 32 sends clean coolant from the coolant tank 31 to the machine tool. continues to grow. When the clogged part of the filter paper moves to the rising wall 40, a new part of the filter paper is discharged. It is drawn onto the wedge wire 60 of the mouth 13. After that, the motor 19 stops. After the motor 19 stops, the three-way valve 36 switches to its original position and the pump 32 The connection is switched from the coolant tank 31 to the suction chamber 14. The above operation is automatically repeated every time the filter paper 30 becomes clogged.

0012 In the above operation, the direction of the slit 61 and the moving direction of the filter paper 30 are the same. Therefore, the frictional resistance force F2 when the filter paper 30 moves on the discharge port 13 is small. , the occurrence of slippage between the filter paper and the chain is reduced. As a result, The filter paper 30 will not be damaged. Also, due to the pressure difference between the inside of the tank 11 and the inside of the suction chamber 14, the filter paper 30 is The coolant D may be sucked into the slit 61 or become dirty on the filter paper 30. Even if the cutting pieces (not shown) inside the filter may become stuck, the filter should not be used for the same reason. The paper 30 can be moved as it is and is less likely to be damaged. . Even if the filter paper 30 were torn, the gap between the slits 61 should be made narrower. This prevents large cutting powder from entering the suction chamber 14. be able to.

[0013] In addition, the polluted liquid filtration device 10 explained above uses the pump 32 to filter the suction chamber 1. 4 is lower than the pressure in the tank 11, and the dirty coolant D is removed from the suction chamber 14. It is called a vacuum filtration device or a polluted liquid suction filtration device. Ru.

[0014]

[Effect of the idea]

According to the discharge port structure of the present invention, the slit is formed in the same direction as the moving direction of the filter paper. Therefore, the following effects are achieved. The frictional resistance force F2 of the filter paper on the discharge port becomes smaller, and the chain and the filter paper This eliminates the slip phenomenon between the filter paper and the filter paper, allowing smooth movement of the filter paper. Once you can move the filter paper smoothly, you will be able to move the filter paper smoothly. , damage to the filter paper can be prevented. Since the frictional resistance force F2 becomes smaller, it is possible to use a filter that is inexpensive and has low tensile strength. Paper can be used. The filter paper is sucked into the slit and falls due to the pressure difference between the inside and outside of the polluted liquid tank. Even if the filter paper gets stuck in the filter paper, The filter paper can be smoothly moved over the discharge port in its original state. If the filter paper is damaged or you forget to attach it, the polluted liquid may pass through the filter paper. Even if it flows into the slit without being Ground powder can be filtered.

[0015]

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view along the filter paper of a filtrate suction type filtration device with a discharge port structure according to the present invention.

FIG. 2 is a partial plan view of the discharge port seen from inside the dirty tank.

FIG. 3 is a right side view of FIG. 2;

[0016]

[Explanation of symbols]

10 Polluted liquid filtration device 11 Dirty tank (pollution tank) 12 Bottom plate 13 Outlet 16 Flight conveyor chain (chain) 30 Filter paper 61 slit

Claims (1)

[Scope of utility model registration request] 1. A polluted liquid filtration device having a discharge port formed in a bottom plate of a polluted liquid tank and covered with a filter paper moved by a chain, wherein the discharge port is formed by a plurality of slits parallel to the moving direction of the filter paper. A filtrate outlet structure of a polluted liquid filtration device, which is characterized by: