JPH03181304A - Method for confirming clamping of filter plates - Google Patents

Abstract

PURPOSE:To labor-savingly detect the clamping of the filter plates of a horizontal filter plate-type filter by measuring the pressure in a filtration chamber a specified time after a pipeline communicating with the chamber is closed and then pressurized to a specified value. CONSTITUTION:Filter plates 1 are vertically mounted to form a filtration chamber, and a suspension is filtered by a filter medium inserted between the plates 1 in the horizontal filter plate-type filter. The clogging of the plates 1 is confirmed as described below. A filter medium 4 is firstly inserted between the plates 1, and then the plate stack is clamped by an opening and closing device 6 to form a filtration chamber. Shut-off valves 16 and 16' are then closed to close a raw liq. pipeline and a filtrate pipeline, compressed air is introduced to pressurize the filtration chamber to a specified value, and then a shut-off valve 15 is closed. The pressure in the filtration chamber is measured by a pressure indicator controller 13 after a specified time, and an alarm is issued when the pressure is abnormally high as compared with the pressure drop in normal clamping.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a horizontal door plate type filter, and more particularly to a method for checking whether the door plate of a horizontal door plate type filter is fastened.

[Conventional technology]

The horizontal p-plate type p-chiki is capable of high-accuracy clearance, 7
It has many advantages, such as being able to replace the door material relatively easily, and easily adjusting the capacity of the filter by increasing or decreasing the number of stacked door panels. It is used in many fields such as solid-liquid separation of fine chemicals. Here, a horizontal door plate type filtration machine consists of stacking multiple door plates made of rectangular P frames in multiple tiers (hereinafter referred to as the door plate stack), and combining the two upper and lower door plates to form one filtration chamber. This refers to a filtration machine that filters the undiluted solution through an inserted sheet of filter paper or other mesh material. Each door plate is a connection between the door plate and the motor-driven opening/closing device placed above the top i door plate! The ellipse allows it to move vertically, and if the filtration resistance of the oak wood increases after running for a suitable period of time, the opening/closing device and coupling mechanism open the gap between the door panels and move the wood horizontally to pull out a new section. The feature is that the door plate can be tightened and the filtration operation can be performed again. When tightening this door plate, if there is a hard object in the contact area of the P frame of the upper and lower door plates, or if the furnace frame does not close completely due to other reasons, after restarting the filtration operation. This may cause liquid leakage. For this reason, it is necessary to check the tightening state of the furnace frame before restarting the overflow operation, but conventionally, the position of the furnace frame is detected and confirmed after tightening using a beam I switch, etc. However, in the case of a small gap between the P frames of less than 1 mm, such as when a cake is caught, the detection quality is poor and unreliable, so it was ultimately necessary for the operator to visually confirm the detection. “Every time the frame is tightened,
There was an inconvenience in that the operator had to go to the site where the T-Iki was installed and check each time the gaps between the boards.

[Problem of invention]

The present invention has been made in view of the problems of the conventional technology for soft soil, and is capable of detecting the fastening state of the p-plate of a horizontal p-plate type filter in a labor-saving manner, and is highly reliable. The objective is to provide a confirmation method.

[Means of problem solving]

The gist of the present invention is to provide a horizontal door plate type filter in which door plates are stacked vertically to form a filter chamber and a suspension is filtered by a furnace material inserted between the filter plates. After inserting between the plates, tighten the p-plate to form a filtration chamber, block the pipe line communicating with the filtration chamber, introduce pressurized air into the filtration chamber, pressurize it to a predetermined pressure, and then a predetermined period of time has elapsed. This is a method for checking the fastening of P plates, which is characterized in that the fastening state between the P plates is confirmed by measuring the pressure inside the filtration chamber afterwards.

[For production]

After inserting the furnace material between the P plates, tighten the filter plate to form a filtration chamber, and close the raw solution pipe, P liquid pipe, and other pipes that communicate with the filtration chamber. Pressurized air is introduced into the filtration chamber and the inside of the filtration chamber is pressurized to a predetermined pressure (3 to 4 kg/ciG). After pressurizing, close the air pipe and measure the pressure inside the filtration chamber after an appropriate period of time (50 to 200 seconds).At this time, if the gap between the plates is large due to cake, etc. When the gap becomes abnormally large, this is detected by a pressure gauge and an alarm is issued to notify the operator that the gap between the door plates is large.In this case, the number of measurements may be one or more times, and in some cases, a microcomputer etc. The determination may be made by pattern recognition.

〔Example〕

The content of the present invention will be further explained below based on Examples.

FIG. 1 is a system diagram of an embodiment of the present invention. In the figure 1
is a P plate stacked in multiple stages, including a T frame 2 with a rectangular (or circular) outer circumference, a bottom plate 3 that divides the P plate into upper and lower parts to form a filtration chamber, and a sheet-like filter paper 4 that resists P overpressure. A mesh plate 5 that is supported in a planar manner and allows for free flow of two-door liquid.
Consisting of The sawn plates 1 are combined vertically to form a filter chamber, and the sheet-like filter paper 4 is deposited on the mesh plate 5 between the upper and lower baffles. Reference numeral 6 denotes a door plate opening/closing device, which uses an electric motor and a jack to move the top cover of the gangplank stack up and down, and has a structure in which all the P plates are opened and closed in conjunction with means for interconnecting the wide plates (not shown). There is. Each P board 1
is connected to one end of a flexible distribution pipe 9,9' which is connected to the liquid supply header 7 and the iP liquid header 8, respectively. lO is an air pipe line, and air holes II, 11 of each filtration chamber
It is connected to via a connecting pipe 12.12. Reference numeral 13 denotes a pressure indicating controller for introducing pressurized air installed in the air pipe line IO. Reference numeral 15 denotes a shutoff valve for blocking the pipeline installed in the air pipeline IO, and 16 and 16' indicate shutoff valves for closing the liquid pipeline installed in the stock solution pipeline and the P liquid pipeline, respectively. .

Next, a method of operating the embodiment having the above configuration will be explained. After inserting a new filter paper 4 between the door panels, the opening/closing device 6 tightens the spanboard stack to form a filtration chamber. Next, the shutoff valves 16 and 16' are closed to close the stock solution pipe and the liquid solution pipe, and then pressurized air is introduced into the filtration chamber by the pressure indicator controller 13 to maintain a predetermined pressure (for example, 3
After increasing the pressure to 4 kg/c+tG), the shutoff valve 15 is closed, and the air pipe line 10 is also closed. After this state is reached, a predetermined period of time (
For example, after 50 to 200 seconds), the pressure inside the filtration chamber is measured once or several times using the pressure indicator controller 13, and if it is abnormally large compared to the pressure drop under normal fastening conditions, an alarm is issued. . In response to this alarm, the operator goes to the installation site of the R-Iki and checks the tightness of the p-plate, and if foreign objects are caught in the saw frame, open the door plate and clean the abutting part of the p-frame. If the rear door plate is properly fastened, the shutoff valves 16 and 16' are opened, the stock solution is introduced into the filtration chamber, and the p-filtration operation is restarted. FIG. 2 is a graph showing data obtained by measuring pressure drop using Test 1-fi. The door plate used in this test is 0.5m
The dimensions are X O, 5m, and the data marked with ○ indicates normal fastening, and the data marked with marks indicates data when a 0.4 mm thick liner was installed between the door panels.

〔Effect of the invention〕

According to the present invention as described above, since the fastening state of the door plate can be checked using a very simple device, the operator does not have to go to the site every time the door plate is opened or closed, thereby saving labor in operation.

[Brief explanation of drawings]

FIG. 1 is a system diagram of an embodiment of the present invention, and FIG. 2 is a graph showing pressure drop data by a test machine. 1; door plate, 2; p-frame, 3; bottom plate, 4; material, 5; mesh spray 1, 6; opening/closing device, 7; liquid supply header, 8;
Liquid header, 9; Distribution pipe, 10; Air pipe line, 11; Air hole, 12; Connecting pipe, 13; Pressure indicating controller, +5.1
6; Shutoff valve.

Claims (1)

[Claims] In horizontal filter filters, filter plates are stacked one above the other to form a filtration chamber, and the suspension is filtered through the filter media inserted between the filter plates.After the filter media is inserted between the filter plates, the filter plates are tightened for filtration. After forming a chamber and closing the pipe line communicating with the filtration chamber, pressurized air is introduced into the filtration chamber and pressurized to a predetermined pressure. A method for checking the fastening of a filter plate, characterized by checking the fastening state of the filter plate.