JP2014062880A - Screening mesh breakage detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable an awareness of the breakage and the wear state of a sieving mesh in real time when a sieving device using a screen mesh is in the operation state, and also to enable a screening mesh breakage detection device to function irrespective of the type, the model, the structure, and the size of the sieving device and the material to be used of the sieving mesh.SOLUTION: A granularity distribution of a powder granular material produced from the sieving device located at the preceding stage of the detection device is measured in real time, and the detection of the coexistence of the errant granularity distribution and the irregular granularity as compared with the recognized normal time granularity distribution can lead to an awareness of a damage, a breakage, and a degree of wear of the sieving mesh used in the sieving device. Since the detection device functions independently from the sieving device located at the preceding stage, any of the type and the model of the sieving device, and the material of the sieving mesh used therefor can be accepted.

Description

  The present invention relates to a screen-type sorting apparatus used to manage powders and granules of inorganic substances, pharmaceutical raw materials, food raw materials, etc. to a target particle size and particle size distribution. It detects screen breakage, breakage, and wear of screens such as used wire meshes and resin meshes.

  Conventional network breakage detection methods use AE signals obtained from acoustic emission sensors, use microwaves, detect abnormal vibrations using vibration sensors, and detect fluctuations in the load current of mechanical decision machines. Although there are some which detect abnormal sound with a sound sensing element, all of these methods do not function unless they are integrated with a target sorting apparatus. Therefore, the existing sorting device cannot be used as it is, and there is a difficulty in that a modification for attaching the sensing device or a sorting device with a sensing device must be newly purchased. In addition, there is a disadvantage that some detection methods cannot be applied to the type and structure of the target sorting apparatus and the material of the net used.

  The present invention is a detection device that is completely independent from the target sorting apparatus, and recognizes normality while measuring in real time the particle size distribution of the powder produced from the sorting apparatus located in the previous stage. In order to detect screen breaks and wear levels used in the previous sorting device by detecting out-of-standard particle contamination and abnormal fluctuations in the size distribution compared to the particle size distribution at the time, the target sorting device The purpose is to eliminate the above-mentioned difficulties and to use the existing screen type sorting apparatus as it is without requiring any side modification or cooperation.

  In addition, in order to receive the granular material produced from the target sorting device as it is and demonstrate the detection function, the above drawbacks are eliminated, and the type, model, structure, size and use of the target sorting device The purpose is not to ask any kind or material of the screen.

  Claim 1 of the present invention for solving the above-mentioned problems is intended to detect a powder produced from a target sorting apparatus, and to receive a granular pipe, a cylindrical pipe for receiving the powder, a particle size measuring chamber, and a dry particle size measuring machine. Because it is a detection device that integrates the evaluation calculation circuit, display monitor, and powder outlet, it does not require mechanical and electrical cooperation with the sorting device located in the previous stage, and the target sorting It functions regardless of the type and specifications of the device.

  Claim 2 of the present invention is to provide an isolated measurement space in the cylindrical pipe for receiving the granular material for continuously measuring the particle size of the granular material at a flow rate necessary for the particle size measurement. Therefore, after the sampled granular material that is the target of particle size measurement passes through the measurement area, it merges with the granular material that is not the target of measurement and continuously falls. The whole body is continuously discharged as it is.

  According to a third aspect of the present invention, the amount of granular material necessary for the particle size measurement is continuously taken from the sampling hole provided at the top of the mountain-folded branch plate, and the particle size measurement cylindrical pipe according to the second aspect is provided. The particle size distribution of the target granular material is measured in real time by allowing it to fall naturally through the particle size measurement region provided in the above. In addition, by making the mountain-folded branch plate into a two-stage upper and lower type, a powder concentration suitable for particle size measurement can be secured and accurate particle size measurement can be performed.

  According to claim 4 of the present invention, the agglomerates contained in the granular material incorporated for particle size measurement are dispersed by air ration in an unsealed space before passing through the particle size measurement region, whereby the agglomerates are dispersed and coarse particles. It is characterized by preventing erroneous measurement to be recognized.

  The screen breakage detection apparatus of the present invention has the above-described functions and has the following effects.

  (1) Regardless of the type and specification of the target screen type sorting apparatus and the type and material of the net used, it functions only by being installed independently at the subsequent stage of the sorting apparatus.

  (2) Since the measurement object is measured in real time, it is possible to quickly and reliably detect extraneous particle contamination and abnormal fluctuations in the particle size distribution.

  (3) In addition to screen breakage and breakage, the degree of wear of the screen mesh can be grasped.

  (4) The granular materials received by the detection device at the entrance are immediately discharged from the exit without any loss as they are.

  (5) The powder which is easily aggregated is subjected to a dispersion action by airation before passing through the particle size measurement region, and accurate particle size measurement can be performed.

Front view of the screen breakage detection device of the present invention Plan view of the device Side view of the device Perspective view of mountain-folded branch plate with sampling holes Top view of air nozzle Example of normal size distribution display Display example of particle size distribution at the time of abnormality Display of particle size distribution at the time of abnormality, etc.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  In FIG. 1, 1 is a cylindrical pipe for receiving, 2 is a mountain-folded branch plate (for upper stage), 3 is a sampling hole, 4 is a mountain-folded branch board (for lower stage), 5 is a cylindrical pipe for particle size measurement, 6 is FIG. 1 is a front view of a screen breakage detection device in which all mechanisms are integrated, in which a particle size measurement region, 7 is a dry particle size measuring device, 8 is a display monitor (liquid crystal panel), 9 is an opposed air nozzle.

  When the total amount of powder produced from the previous sorting device is continuously supplied to the receiving cylindrical pipe 1, the powder necessary for particle size measurement is the top of the mountain-folded branch plate (for upper stage) 2 Only the granular material that has entered through the sampling hole 3 provided at the top and passed through the sampling hole 3 provided at the top of the mountain-folded branch plate (for lower stage) 4 falls into the particle size measurement region 6 below, and dry particle size measurement It is measured in real time by the machine 7. In this case, the granular material which has passed through the sampling hole 3 of the mountain fold type branch plate (for upper stage) 2 but does not pass through the sampling hole 3 of the mountain fold type branch plate (for lower stage) 4 is not subject to particle size measurement, and particle size measurement. It falls through the space isolated from the cylindrical pipe 5 for use and continuously discharged out of the machine.

  In addition, most of the powder particles that do not enter the sampling hole 3 provided at the top of the mountain-folded branch plate (for upper stage) 2 are dropped as they are and continuously discharged out of the machine. At the same time, the granular material passing through the particle size measurement region 6 is subjected to particle size measurement in real time, and then merges with the granular material not measured and continuously discharged out of the machine.

  In addition, the granular material that has passed through the sampling hole 3 of the mountain fold type branch plate (for upper stage) 2 is subjected to an air ration action in the space above the mountain fold type branch plate (for lower stage) 4 so that the mixed agglomerates are dispersed. The

  FIG. 2 is a plan view of the screen breakage detecting device of the present invention. When the hole of the sampling hole 3 provided at the top of the mountain-folded branch plate (for upper stage) 2 is closed, the received granular material is left and right. It can be seen that it is branched, passes through as it is, and is discharged out of the machine.

  FIG. 3 is a side view of the detection apparatus, and the particle size distribution measured in real time is always displayed on the touch panel display monitor (liquid crystal panel) 8. Further, the particle diameter (mm) and the allowable ratio (% by weight) set as the threshold values on the coarse powder side and the fine powder side according to the object are displayed.

  When this threshold value is set, when either one of the following conditions is satisfied, a detection signal is generated by the operation of the evaluation arithmetic circuit, and the abnormality indicator lamp is turned on. In addition, it is possible to automatically control the front-stage sorting apparatus and the rear-stage apparatus using this detection signal.

  (1) When the ratio of particles larger than the set particle diameter exceeds the allowable ratio in the coarse powder side threshold value.

  (2) When the ratio of particles smaller than the set particle diameter exceeds the allowable ratio in the fine powder side threshold value.

  FIG. 4 is a perspective view of a mountain-folded branch plate provided with a sampling hole 3 at the top for taking in an amount of powder necessary for particle size measurement. The size and shape of the sampling hole 3 are different. Further, since particles larger than the short diameter of the long hole of the sampling hole 3 cannot pass through, the particle size measurement is excluded.

  FIG. 5 is a configuration diagram of the opposed air nozzle 9 for dispersing the agglomerates, which is provided between the two-stage mountain-folded branch plates and provided on the inner wall of the receiving cylindrical pipe 1.

  FIG. 6 shows an example of a normal particle size distribution displayed on the display monitor (liquid crystal panel) 8 during operation of the screen breakage detection device of the present invention. Here, the horizontal axis represents the particle size classification, the vertical axis represents the weight% in the classification, and the two broken lines represent the particle size (coarse powder side and fine powder side) of the set threshold value.

  FIG. 7 is an example of a display of an abnormal particle size distribution displayed on the display monitor (liquid crystal panel) 8 during operation of the screen breakage detection device of the present invention.

  FIG. 8 is another example of the display of the particle size distribution at the time of abnormality displayed on the display monitor (liquid crystal panel) 8 during the operation of the screen breakage detection device of the present invention.

  Hereinafter, embodiments will be described with reference to the drawings.

  In FIG. 1 and FIG. 2, a cylindrical pipe 5 for particle size measurement with a diameter of 100 mm is horizontally arranged in a cross-crossing relationship within a receiving cylindrical pipe 1 with a diameter of 250 mm arranged vertically. (Upper stage) A 6 mm wide and 80 mm long sampling hole 3 provided at the top of 2 is located directly above the central axis of the particle size measuring pipe 5 and is positioned in the middle of the receiving cylindrical pipe 1. This is provided at the entrance of the receiving cylindrical pipe 1. Further, both edges of the mountain fold type branch plate (for upper stage) 2 are connected to the inside of the receiving cylindrical pipe 1 and the lower part is provided as an open space.

  In FIG. 3, a long hole sampling hole 3 having a width of 4 mm and a length of 40 mm provided at the top of the mountain fold type branch plate (lower stage) 4 is looked down from above, and the long hole of the mountain fold type branch board (upper stage) 2 Crossing at right angles to the sampling hole, both sides of the isosceles triangle of the mountain-folded branch plate (for lower stage) 4 are closed with a plate, and the lower part of the square is connected so as to be connected to the cylindrical pipe 5 for particle size measurement. It is provided so as to block the intrusion of powder from other than.

  Further, a dry particle size measuring machine 7 was provided on the side surface portion of the cylindrical pipe 5 for particle size measurement, and an open space was provided by cutting out a portion directly below the particle size measuring region of the cylindrical pipe. As a result, the granular material that has entered through the sampling hole 3 of the mountain-folded branch plate (for the lower stage) 4 is measured in real time when it naturally falls and passes through the particle size measurement region 6 in the cylindrical pipe 5 for particle size measurement. . Moreover, the granular material which passed the particle size measurement area | region 6 merges with the granular material outside a measuring object, and is continuously discharged | emitted outside the apparatus. Examples of the dry particle size measuring device 7 include a laser diffraction particle size measuring device.

  In FIG. 4, the cross-sectional area ratio of the long hole (width 6 mm, length 80 mm) of the sampling hole 3 provided at the top of the mountain-folded branch plate (for upper stage) 2 and the receiving cylindrical pipe 1 having a diameter of 250 mm is approximately 1 to 100, a long hole (width 4 mm, length 40 mm) of the sampling hole 3 provided at the top of the mountain-folded branch plate (for lower stage) 4 and a spatial cross section (width 80 mm, length 100 mm) at that position The cross-sectional area ratio is 1:50. Further, it is necessary to change the sizes and shapes of the upper and lower sampling holes 3 in accordance with the diameter of the receiving cylindrical pipe 1. In the case of Example 1, particles larger than the short diameter 4 mm of the long hole of the sampling hole 3 for the lower stage cannot pass through and are excluded from the particle size measurement. Therefore, the size of the supplied granular material is required to be 4 mm or less in diameter. Is done.

  FIG. 5 is a configuration diagram of the opposed air nozzle 9 provided in the receiving cylindrical pipe 1, and the top of the mountain-folded branch plate (for upper stage) 2 above the sampling hole 3 of the mountain-folded branch board (for lower stage) 4. The mixed agglomerates are dispersed by injecting compressed air from the left and right onto the granular material that has entered from the sampling hole 3. The compressed air injected here passes through the open space together with the powder particles that do not enter the sampling hole 3 of the mountain-folded branch plate (for lower stage) 4 and is discharged outside the apparatus.

  A series of net products (Chinese medicinal raw material powder, maximum particle size 0.850mm) produced while a general-purpose circular vibrating screen equipped with a new screen with a wire mesh diameter of 1000mm, aperture of 0.600mm, and wire diameter of 0.390mm When the data is supplied to the detection apparatus, the information obtained is as follows. In this case, the coarse particle side threshold value for detecting and notifying that the particle ratio of the particle diameter of 0.600 mm or more is 8% and the differential threshold value for detecting and notifying the particle ratio of the particle diameter of 0.250 mm or less are 3%. Yes. This threshold value is arbitrarily set according to the particle size range and the allowable ratio required for the granular material supplied to the detection apparatus. Moreover, it collected individually with the campus chute provided temporarily in order to measure the weight of the powder which passes a particle size measurement area | region. Moreover, the raw material supply to the circular vibration sieve machine of the front | former stage was made into the fixed supply of 1500 kg per hour.

  The supply amount of the powder was 20.7 kg per minute and the operation was continued for 1 hour. As a result, the total discharge amount was 1240 kg together with the amount of powder 0.250 kg that passed through the particle size measurement region. An example of the particle size distribution displayed on the display monitor (liquid crystal panel) 8 during operation is shown in FIG. In this case, no significant change was observed in the supply amount or the particle size distribution, and no detection notification was given. Moreover, the particle ratio of 0.600 mm or more shown during operation was in the range of 5 to 6%, and the particle ratio of 0.250 mm or less was in the range of 0 to 1%.

  Subsequent to Example 2 described above, the information obtained in the case of carrying out under the same conditions after cutting a part of the wire net with a metal cutting rod over a length of 100 mm to intentionally create a net breaking part is as follows.

  The supply amount of the powder was 22.1 kg per minute and the operation was continued for 30 minutes. As a result, the total discharge amount was 660 kg together with the amount of powder 0.133 kg that passed through the particle size measurement region. An example of the particle size distribution displayed on the display monitor (liquid crystal panel) 8 during operation is shown in FIG. In this case, large fluctuations were observed in the supply amount and particle size distribution, and a detection notification was given 5 seconds after the start of operation. The proportion of particles of 0.600 mm or more shown during operation was in the range of 20-25%. Moreover, the particle ratio of 0.250 mm or less was in the range of 0 to 1%. At this time, the maximum particle diameter in the net product of the circular vibrating screen was 2.36 mm.

  Subsequent to Example 3, after replacing the screen with the same specifications as Example 2 used for 3600 hours of operation time, the information obtained when implemented under the same conditions is as follows.

  The supply amount of powder was 21.6 kg per minute and the operation was continued for 1 hour. As a result, the total discharge amount was 1290 kg together with the amount of powder 0.260 kg that passed through the particle size measurement region. FIG. 8 shows another example of the particle size distribution displayed on the display monitor (liquid crystal panel) 8 during operation. In this case, fluctuations were observed in the supply amount and particle size distribution, and a detection notification was given 1 minute after the start of operation. The proportion of particles of 0.600 mm or more shown during operation was in the range of 7-10%. Moreover, the particle ratio of 0.250 mm or less was in the range of 0 to 1%.

  Although the fourth embodiment has been described above, the present invention can take the following embodiments.

  (1) For the dry particle size analyzer, laser diffraction particle size analyzers such as those manufactured by Malvern, UK, Sympatec, Germany, Honeywell, Shimadzu, Horiba, etc. are used. can do.

  (2) The diameter of the cylindrical pipe for receiving is effective from 150 mm to 350 mm, and need not be 250 mm.

  (3) The diameter of the cylindrical pipe for particle size measurement is effective from 50 mm to 150 mm, and need not be 100 mm.

  (4) The size and shape of the sampling hole provided at the top of the mountain-folded branch plate need not be fixed and can be arbitrarily determined.

  (5) Air separation using an opposed air nozzle is effective for powders that easily aggregate due to static electricity or the like, and is not necessarily performed.

  (6) The material of the cylindrical pipe may be any type such as plastic or metal.

  (7) The external device can be automatically controlled using the detection signal based on the threshold value.

  (8) The threshold value for notifying the detection signal can be arbitrarily set and changed on the touch panel.

1 Cylindrical pipe for receiving 2 Mountain-folded branch plate (for upper stage)
3 Sampling hole 4 Mountain fold type branch plate (for lower stage)
5 Cylindrical pipe for particle size measurement 6 Particle size measurement area 7 Dry particle size measuring machine 8 Display monitor (liquid crystal panel)
9 Opposite air nozzle

Claims (4)

  It is a detection device that is used in the subsequent stage of a screen sorting device that uses a screen mesh. In addition to a vertically arranged cylindrical pipe that accepts the total amount of powder produced from the screen sorting device, it incorporates the amount required for particle size measurement. A mountain-folded branch plate with a sampling hole for the top, a cylindrical pipe for particle size measurement through which only the granular material for particle size measurement passes, a dry particle size measuring machine, an evaluation calculation circuit, and a touch panel display monitor ( A screen breakage detecting device comprising a liquid crystal panel) in a single container.   A screen network breaker comprising a cylindrical pipe for particle size measurement, which is in the cylindrical pipe arranged vertically and has a diameter smaller than that of the cylindrical pipe and is horizontally arranged in a crossing relationship with the cylindrical pipe. Detection device.   A screen network breakage detecting device comprising a mountain-folded branch plate provided with a sampling hole by an upper and lower two-stage system at the top.   A screen breakage detecting device provided with an opposing air nozzle for injecting compressed air into a space that is not a sealed space, between the two-stage mountain-folded branch plates.

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