JPH0141506Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention is used for classification of powder, granular materials, liquids, etc., foreign matter removal,
This invention relates to a vibrating sieve device that performs sieving.

Conventional technology and its problems In general, the amount of powder or liquid in various hoppers or containers or the level of their upper surface can be detected by measuring the weight of the hopper or container with a load cell, or by using an appropriate sensor. This is done by installing it in the hopper or container and detecting the upper surface level of the powder or liquid inside.

However, with regard to vibrating sieving devices used for the purpose of classifying powder, granular materials, liquids, etc., removing foreign substances, sieving, etc., the above-mentioned prior art does not know how to measure the amount or level of the material to be processed accommodated in the device. Even if you try, it is actually impossible to go up and down.

This is because the part of the vibrating sieving device that accommodates the processed material vibrates violently, so it cannot be supported by a load cell, and even if a sensor is installed in the part that accommodates the processed material as in the past, the violent vibrations cannot be supported. Exposure to this will reduce accuracy and cause damage in a short period of time.

Furthermore, although the processing object storage portion is provided with a lid to prevent the processing objects from flying away, the lid may get in the way and prevent an appropriate sensor from being provided.

Instead of using such a load cell or sensor, monitoring with a television camera may be considered, but in this case, the lid must be opened, and visual judgment using a television camera is difficult and unreliable.

Under these circumstances, there has been no suitable vibrating sieving device that allows knowing the amount of the treated material contained therein or its upper surface level. However, in a vibrating sieving device, if the screen mesh or cloth (these are collectively referred to as the "screen mesh") becomes abnormally clogged, or if the material to be processed exceeds the processing capacity of the screen mesh, the material to be processed on the screen The amount of material to be processed increases abnormally, and the level of the upper surface of the material increases abnormally. When the screen net is torn, the amount of material to be processed on it decreases abnormally, and the level of the upper surface of the material decreases abnormally. If you can know the level, you can compare it with a predetermined standard value to know the risk of overflow of the material to be processed, abnormal clogging or tearing of the screen net, as well as the amount of material to be processed on the screen net or its It is also possible to automatically control the top surface level.

Therefore, as a result of intensive research, the inventor of the present invention found that in a vibrating sieving device, the vibrating container with a screen net stretched over it is supported by a fixed part by a spring device, and therefore, when the amount of material to be processed in the vibrating container increases or decreases, Focusing on the fact that the vibrating container is displaced due to the accompanying change in its own weight, a non-contact sensor that emits an electrical or electronic quantum signal corresponding to the amount of mechanical displacement of the vibrating container is placed at a fixed position. At the same time, if a distance recognition device is provided that receives a signal from the sensor and recognizes the distance between the vibrating container and the sensor, it is possible to indirectly know the amount of the material to be processed on the screen net or the level of its top surface. This discovery led to the completion of this invention.

Means for Solving the Problems In other words, the present invention provides a vibrating container that is supported by a spring device, has a screen net inside, and is displaced in accordance with changes in its own weight as a whole due to an increase or decrease in the amount of material to be processed on the screen net. In a vibrating sieve device, a non-contact type sensor that emits an electrical or electronic quantum signal of a degree corresponding to the amount of mechanical displacement of the vibrating container is arranged at a fixed position, and in response to a signal from the sensor, the The present invention relates to a vibrating sieving device characterized by being provided with a distance recognition device that recognizes the distance between a container and a sensor.

Examples of the non-contact type sensor include an eddy current type sensor, a magnetic type sensor, a photoelectric type sensor, a back pressure type sensor using air flow, and the like.

When using an eddy current sensor, the part of the vibrating container facing the sensor must be an electrical conductor;
If a magnetic sensor is used, the portion of the vibrating container that faces the sensor must be made of magnetic material.

The above-mentioned types of vibrating sieve devices include in-plane motion type so-called gyratory shifters and gyroscope shifters, horizontally installed low head screens, elliptical vibrating sieve devices, resonance screens and binders, vibrating motor type resonant screens and synchronous types. Screens, as well as universal screens, circular mesh vibrating sieves, and Dalton vibrating sieves with screen meshes adjusted in multiple stages up and down.

In addition, when referring to the amount of mechanical displacement of the vibrating container mentioned above, the term "container" is a concept that includes not only the container itself, but also those that are connected to the container itself and can be displaced together with the container itself. It is.

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

The illustrated vibrating sieve device S is called a Sueco screen, and in the illustrated example, it is used to pre-screen a coating material to be applied to paper to improve its printability, appearance, etc. It is being

The vibration container 1 has an upper frame 12 having a lid 11, a lower frame 14 made of a conductive material and having a bottom plate 13, and a screen net 15 stretched between the upper and lower frames. The lower frame 14 is provided with a size outlet 121 and an undersize outlet 141.

Further, a vibration drive motor 16 having eccentric loads 161 and 162 at the upper and lower ends is attached to the lower frame 14.

The vibrating container 1 is supported on a fixed frame 3 via a plurality of springs 2.

Therefore, when the motor 16 is started, the container 1 vibrates and the paint on the screen net 15 can be screened.

Paint is supplied to the container 1 from a supply line L1 via a control valve V1. Furthermore, the paint discharged from the undersize outlet 141 flows into the circulation tank 4, from which it returns to the container 1 via the circulation line L2 and control valve V2 using the pump P1, and on the other hand, it is transferred to the next process using the pump P2. sent to.

The fixed frame 3 supporting the vibrating container 1 has the vibrating container 1 facing the lower frame 14 of the container.
A non-contact type sensor 5 such as an eddy current type position sensor or an eddy current loss shape displacement sensor that emits an electrical or electronic quantum signal of a degree corresponding to the amount of mechanical displacement is installed.

The distance between the sensor 5 and the lower frame 14 is
It is determined in consideration of the maximum expected approach distance of the container 1 to the sensor 5 and the maximum swing width of the container 1 so that the frame 14 will not collide with the sensor 5.

A signal from the sensor 5 is sent to a distance recognition device 6 connected to the sensor 5, and the recognition device 6 is connected to a calculation device 7.

The distance recognition device 6 is capable of setting a zero point and is capable of detecting a distance of several microns, receives a signal from the sensor 5, calculates the distance between the container 1 and the sensor 5, and outputs a signal corresponding to the distance. The computing device 7
Enter.

The device 7 compares the distance with a predetermined reference value for determining the danger of screen mesh clogging or paint overflow, and if the distance exceeds the reference value, the screen mesh is abnormally clogged and the paint on the screen mesh is removed. The device 7 emits a signal indicating that the screen level has increased abnormally, and the device 7 compares the distance with a predetermined reference value for determining screen network tearing, and if the distance exceeds the reference value, the screen network is removed. It emits a signal indicating that the paint surface level has fallen abnormally due to breakage. Signals from these computing devices are used to stop the motors of each pump, close control valves, activate the screen tear alarm AL, etc.

In addition, the computing device 7 constantly compares the distance between the container 1 and the sensor 5 with a reference value corresponding to the constant level so as to maintain the paint level in the container 1 constant, and controls each pump motor and control valve. It issues signals for controlled operation as appropriate.

In this way, in the vibrating sieve device S, oversupply of paint to the container 1, clogging of the screen net 15, or tearing of the screen net 15 is immediately detected, and it is possible to prevent loss of valuable paint from flowing out.
It is possible to prevent the occurrence of defective products (for example, those with minute protrusions due to pigment or the like on the paper surface) in subsequent steps due to troubles in the sieving device 7.

Effects of the invention As described above, according to the present invention, it is possible to detect excessive supply of material to be processed into the vibrating container, clogging of the screen mesh, or tearing of the screen mesh, and to prevent leakage of valuable material to be processed. A vibrating sieving device that makes it possible to prevent the occurrence of defective products in subsequent processes due to problems with the sieving device, and also enables unattended management such as automatically controlling the amount of material to be processed in the vibrating container and the level of its top surface. can be provided.

[Brief explanation of the drawing]

The drawing is a schematic diagram showing one embodiment of the present invention. S... Vibrating sieve device, 1... Vibrating container, 2...
...Spring, 5...Sensor, 6...Distance recognition device, 7...Arithmetic device.

Claims (1)

[Scope of utility model registration request] In a vibrating sieving device equipped with a vibrating vessel supported by a spring device, having a screen net inside, and displacing in response to changes in the overall weight due to increases and decreases in the amount of material to be processed on the screen net, a machine of the vibrating vessel A non-contact sensor that emits an electrical or electronic quantum signal of a degree corresponding to the amount of displacement of the object is placed at a fixed position, and the distance between the container and the sensor is recognized by receiving the signal from the sensor. A vibrating sieve device characterized by being equipped with a recognition device.