JPS62216613A - Method for automatically detecting generation of partial pressure on filter plate in filter press - Google Patents

Abstract

PURPOSE:To detect generation of partial pressure on a filter plate by providing a detector bar projecting outward from the filter plate, moving a traveling body equipped with a sensor at a constant speed during press filtration, and detecting the abnormality in the interval between the arranged detector bars. CONSTITUTION:The detector bars 33 are respectively projected outward from a requisite number of the filter plates 25 provided to the filter press, and the detector bars 33 are arranged at regular intervals when the filter plates 25 are closed. The traveling body 43 which is provided with the sensor 50 and can be freely moved back and forth is arranged in the vicinity of the filter plate 25, the traveling body 43 equipped with the sensor 50 is moved at a constant speed during press filtration by the closed filter plates 25, and the abnormality in the interval between the arranged detector bars 33 is detected by the sensor 50. Generation of partial pressure on the filter plate 25 during press filtration is detected in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a method for automatically detecting the occurrence of partial pressure on a filter plate in a filter press.

Conventional technology Conventionally, in the squeeze filtration process in a filter press, a large amount of cake accumulates near the inlet of the void due to the properties of the stock solution, and the pressure inside the filter chamber sometimes becomes lower than the pressure inside the other i11 chambers. there were. In such a case, when a difference occurs in the pressures in the adjacent voids and so-called uneven pressure occurs, the filtering surface of the filter plate between the two line chambers is pushed by the higher pressure, and the lower pressure There is a problem in that the filter bulges out into the void, and in severe cases, cracks occur on the filter surface, impeding the filtering operation.

Purpose of Squeezing This invention was developed as a result of intensive research to solve the above problems.When the above-mentioned uneven pressure occurs during press filtration, the filtration surface is deformed due to this. It was discovered that the hanging handles on both the left and right sides of the filter plate being closed were also deformed so that they were no longer parallel to the hanging hands of other filter plates.
This led to the completion of this invention.

An object of the present invention is to easily and reliably detect the occurrence of uneven pressure from the outside of the filter plate during compression filtration using the filter plate, and to prevent deformation of the filter plate due to the uneven pressure. An object of the present invention is to provide a method for automatically detecting the occurrence of uneven pressure on a filter plate in a filter press, which allows the filter press to perform filtration work smoothly at all times.

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a required number of filter plates provided in a filter press, each having a detection bar protruding outward, and all detection bars being equal when the filter plate is in a closed state. Attach them so that they are spaced apart,
a! ! A movable body equipped with a sensor that can move back and forth is placed near the roots, and when the filter plate in the closed state is being squeezed, the movable body with the sensor is moved at a constant speed, and the sensor detects abnormalities in the spacing of the detection bars. The gist of this paper is a method for automatically detecting the occurrence of uneven pressure on a filter plate in a filter press, which is characterized by detecting the occurrence of uneven pressure on a filter plate by detecting .

Example Next, embodiments of the invention will be described with reference to the drawings.

In this manual, the front refers to the first side and the rear refers to the rear head side. Also, left and right refers to the direction toward the rear.

1 to 6, the filter press (21) includes a fast head (22), a loose head (23),
It mainly consists of a rear head (24), a pair of left and right side plates (26), and a large number of filter plates (25) arranged between a fast head (22) and a loose head (23). There are hanging hands (27) on the left and right sides of the filter plate (25).
) are provided, and these hanging hands (27) are attached to the side plate (2
G) By being placed on the upper edge of the filter plate (25)
is slidably supported.

The stock solution supply port (
30), and a filtrate outlet (
31) is provided and communicates with the filtrate passage. In addition, a detection bar (
33) are attached in an upwardly projecting manner, and when the filter plate (25) is in the closed state, all the detection bars (33) are arranged at equal intervals δ. In addition, the detection bar (3
3) The lower half is inserted into the insertion hole (3) in the center of the upper part of the filter plate (25).
4), and the frame part (25) of the filter plate (25).
The portion (34a) of the insertion hole (34) corresponding to the insertion hole (34) is made larger than the outer shape of the detection bar (33), and as the filter surface (28) expands and deforms due to uneven pressure, the detection bar (34a) 33) is designed to be easy to tilt.

A horizontal U-shaped guide frame (36) is arranged horizontally on the upper part of the filter press (21), and both front and rear ends of this frame (36) rise from the first head (22) and the V-head (24). A pillar (37
) (38). Guide frame (
Cheno guide rails (39) are attached to the upper surfaces of the upper and lower horizontal parts (36a) (36b) of 36), respectively.
The vertical straight portions of an endless roller chain (42) wound around a pair of front and rear sprockets (40, 41) are guided by guide rails (39), respectively. The chino (42) is rotated forward or reverse by a reversible motor (48) provided on the rear column (38). A moving body (43) is attached to the middle of the lower horizontal part (36b) of the ceno (42). Mobile object (
43) is made up of a mounting plate (44), a horizontal bracket (45) extending to the left from this, and a pair of left and right vertical plaques 1146) provided on the lower surface of the horizontal bracket (45) at a predetermined distance from each other. It is configured. The mounting plate (44) of the moving body (43) is attached to the guide frame (3).
6) is slidably guided via a holding member (59) containing a number of transfer balls to a slide rail (47) attached to the inner surface of the vertical part (36C) in the direction of the movement. . A pair of left and right vertical brackets (46) on the moving body (43) are equipped with light emitting lights 1 facing each other as sensors.
A fiber-optic photoelectric switch (50) is installed, comprising a photodetector (51) and a photoreceiver (52). The upper surface of the horizontal bracket (45) has an L-shaped plaque 1-(
The photoelectric switch main body (53) is attached via the photoelectric switch (49). The photoelectric switch body (53) and the floodlight (51)
) and the light receiver (52) are each connected to each other by an optical fiber cable. Also first head (22
), the front light shielding plate (54) is located at the top of the detection bar (3).
3), and a rear light shielding plate (55) is attached to the upper end of the loose head (23).
) is between the last detection bar (33) and III! i(i
They are installed so that they are lined up. In this embodiment, the length of the rear light shielding plate (55) in the front-rear direction is longer than the length of the front light shielding plate (54) in the front-rear direction.

The signal of the change in the received light M from the photoelectric switch (50) is controlled by the control 6.
Sent to 05111 (56). First head (2
2) is connected to the stock solution supply pipe (57), and the stock solution supply pipe (57) is connected to the stock solution supply pipe (57).
57), a stock solution supply pump (P) and a valve (58) are interposed. The stock solution supply pump (P) and photoelectric switch movement motor (48) are controlled by the control panel (56).
It operates based on signals from.

A method for automatically detecting the occurrence of partial pressure in the filter plate (25) in the filter press (21) according to the present invention will be explained based on FIG. 7.

First, the pressure Fll when the filter plate (25) is in the closed state (see Figure 1)
When the ila period is over, the ffl liquid supply vertical pump (P) operates to supply the stock solution to the supply pipe (57) and the first head (22).
) into each void (32) (step 1)
. On the other hand, the endless roller chino (42) is rotated by the operation of the photoelectric switch moving motor (48), and the endless roller chain (42) is rotated during the press filtration or at any time during the process.
The body (43) and the photoelectric switch (5G) integrated therewith are moved along the slide rail (47) and between the fast head (22) and the loose head (23) (
Step 2). Then, the occurrence of polarized pressure on the filter plate (25) is detected by the photoelectric switch (50) as follows.

That is, in the squeeze filtration process, a photoelectric switch (5
0) is located above the loose head (23), when this photoelectric switch (50) is turned on (step 3), light is emitted from the emitter (51) of the photoelectric switch (50) and sent to the receiver (52). The light beam that reaches the rear light shield (
55), and the amount of light received by the light receiver (52) becomes zero. After passing the rear light shielding plate (55), the m
The minimum reference time (T1) timer provided in m (5B) is turned on (step 4), and the next filter plate (25) is detected from the rear light shielding plate (55) by moving the photoelectric switch (50). The actual measured value (T) of the transit time to the bar (33) is determined in advance by the distance (1) between the two and the photoelectric switch (
It is checked whether the minimum reference value (T1) of the passing time calculated and set based on the moving speed of 50) is exceeded (step 5). When the minimum standard value (T1) is exceeded, the timer for the passing opening tolerance standard value (T2) is turned on at the same time as the minimum standard value (T1) is exceeded (step 6), and then the actual measurement value of the passing time (
It is checked whether T) further exceeds the allowable reference value (T2) (step 7). If the allowable reference value (T2) is not exceeded, the light beam is blocked by the tip of the detection bar (33) within this time range, the received light m becomes zero, and the photoelectric switch (50) is turned off (step 8) In this state, a normal operation indicator lamp (not shown) lights up (step 9). When the light beam passes through this detection bar (33), the amount of received light increases and the photoelectric switch (50) is turned on again, and in the same way, the light beam passes through the next filter plate (25).
to the detection bar (33), and the above operation is automatically repeated.

For example, as shown by the two-dot chain line in FIG. 2, in step 5, the detection bars (3
3) If the actual measurement value (T) of the transit time of the light beam between the comrades is less than the minimum reference value (T1) (T<1), the light beam is blocked by the tip of the detection bar (33). I was told,
The amount of light received becomes pyro, and the photoelectric switch (50) is turned off (step 10 in FIG. 7). This signal immediately causes an alarm to sound (step 11), stopping the stock solution supply pump (P) (step 12) and also stopping the photoelectric switch moving motor (48) (step 13). Also, as shown by the solid line in FIG. 2, in step 7, the detection bar (
33) The measured value (■) of the transit time of the light beam between the comrades is the sum (TI) of the minimum standard value (T1) and the allowable standard value (T2).
+T2) (T>TI+72), an alarm immediately sounds (Step 11 in Figure 7) and the stock solution supply pump (
P) and the motor (48) are stopped (steps 12 and 1).
3). Due to these, uneven pressure is generated on the filtering surface (28) of the filter plate (25), and the filtering surface (28) is deformed so as to bulge out in the linear shape (32) either in the front or rear of the filter plate (25). It is certain that it becomes clear.

Note that the passage time of the light beam when compression filtration is performed normally is determined by the distance (1) between the detection bars (33) and the movement of the moving body (43), that is, the photoelectric switch (50). For example, if this is 2.7±0°3 seconds, the minimum reference value (T1) for the light beam passage time is 2.4 seconds, and the allowable reference value (T1) after this is determined by the speed. T2) is 0.6 seconds.

In addition, in the compression filtration process of the filter press (1), the light beam of the photoelectric switch (50) is transmitted to the detection bar (33) of the filter plate (25) due to the advance of the moving body (43) as described above.
The light passes through from behind to reach the front light shielding plate (54). Since the length of the front light shielding plate (54) in the front-rear direction is longer than that of the detection bar (33), the state where the amount of light received is zero continues for that long, and this is sensed and the motor for moving the photoelectric switch (48 ) is reversed, and this time the charging switch (50) is moved back and forth, and in the same manner as above, the generation of biased pressure on the filter plate (25) is detected while moving back. The photoelectric switch (50) is connected to the rear light shielding plate (55).
), the length in the front and back direction is the front light shielding plate (5
4), this is sensed and the photoelectric switch moving motor (48) is reversed, and the photoelectric switch (5) is moved in the opposite direction.
0) moves forward, and the above detection operation is automatically repeated. Note that switching between forward and reverse directions of the motor (48) at the start end and end end of the movement process of the photoelectric switch (50) may be performed by a limit switch.

In addition, in the above embodiment, the detection bar (33) is attached to the upper part of the filter plate (25);
25) on the left or right side. Furthermore, the means for attaching the detection bar (33) is not limited to that shown in the drawings, and may be attached to the filter plate (25) by other means.

Further, the photoelectric switch (50) is not limited to the transmission type shown in the drawings, but may also be a coaxial reflection type, 13, J: or direct reflection type photoelectric switch.

In addition to photoelectric switches, we also offer other sensors,
For example, infrared sensors, ultrasonic sensors, etc. can also be used.

Effects of the Invention As described above, the method for automatically detecting the occurrence of biased pressure in a filter plate in a filter press according to the present invention includes detecting bars (
33) are mounted so as to protrude outward and all the detection bars (33) are arranged at equal intervals when the filter plate (25) is closed, and are placed near the filter plate (25). A movable body (43) equipped with a sensor (50) is disposed, and during compression filtration using a filter plate (25) in a closed state,
The filter plate (25) is moved by moving the moving body (43) with the sensor (50) at a constant speed, and the sensor (50) detects an abnormality in the arrangement interval (l) of the detection bar (33).
This device is characterized by detecting the occurrence of uneven pressure in the filter plate (25) during squeeze filtration by the filter plate (25).
5) can be easily and reliably detected from the outside;
It is possible to prevent the filter plate (25) from being deformed due to uneven pressure, and the filtration work by the filter press can always be carried out smoothly.

[Brief explanation of drawings]

The drawings show an example of this invention. Fig. 1 is a partially omitted side view of the filter press, and Fig. 2 is an enlarged sectional view of the filter plate, showing the case where uneven pressure is generated in the filtration process. . Fig. 3 is an enlarged front view of the filter plate, Fig. 4 is an enlarged sectional view taken along line IV-IV 15i1 in Fig. 3, and Fig. 5 is an enlarged sectional view of the partial pressure generation detection device of the filter press. This corresponds to line v-V in FIG. 6. FIG. 6 is an enlarged side view of the same portion, and FIG. 7 is a block diagram showing an example of a $ control circuit of the partial pressure generation detection device. (21)... Filter press, (25)... Filter plate, (32)... Linear, (33)... Detection bar, (4
2)...Laura Choi2. (43)...mobile object,
(48)...Motor for moving photoelectric switch, (5G)
...Photoelectric switch (sensor), (P)...Stock solution supply pump. that's all

Claims (1)

[Claims] Each of the required number of filter plates (25) provided in the filter press is provided with a detection bar (33) in an outwardly protruding shape and a filter plate (25).
5) so that all the detection bars (33) are arranged at equal intervals in the closed state of the filter plate (2).
A movable body (43) equipped with a sensor (50) that can be freely moved back and forth is arranged near the sensor (50), and the movable body (43) with the sensor (50) is The sensor (50) detects the detection bar (3) by moving it at a constant speed.
3) A method for automatically detecting the occurrence of uneven pressure in a filter plate in a filter press, characterized in that the occurrence of uneven pressure in the filter plate (25) is detected by detecting an abnormality in the arrangement interval (l).