JPH0581312B2 - - Google Patents

Description

[Detailed description of the invention]

【0001】

TECHNICAL FIELD The present invention relates to a vibrating sieve machine that is capable of immediately detecting breakage of a wire mesh for the sieve during use.

【0002】

[Prior Art] A container is swingably supported on a machine base via a coil spring, a wire mesh is stretched inside the container, and a vibration motor fixed to the container is driven to rotate. Vibrating sieves, which are configured to vibrate to classify and sort powder and granules on a wire mesh, are used to process powder and granules handled in various fields such as medicine, food, and mining, as is well known. has been done.

【0003】

[Problem to be solved by the invention] Now, in this vibrating sieve machine, the wire mesh stretched inside the vessel may suddenly break due to wear or other causes during use, but with conventional vibrating sieve machines, Since it was not known when the wire mesh broke inside, it was difficult to take immediate action, and by the time the wire mesh was noticed it was too late, causing problems such as the need to reprocess a large amount.

【0004】

[Means for Solving the Problems] The present invention aims to solve the above-mentioned problems by installing a rigid punching plate at an appropriate distance from the bottom of a wire mesh stretched horizontally in a container, and electrically disconnecting the wire mesh from the wire mesh. The punching plate is insulated and supported by the wire mesh, and is equipped with a capacitance detector that detects a change in capacitance between the wire mesh and the punching plate, so that damage to the wire mesh can be detected by an abnormal change in the capacitance. It is characterized by the fact that

【0005】

[Function] When the wire mesh is torn and hangs down, the capacitance between the wire mesh and the punching plate changes, so if this is detected during operation of the vibrating sieve machine, damage can be immediately detected from the change.

【0006】

[Example] This vibrating sieve machine has a plurality of coil springs 2 fixedly planted on the outer periphery of a cylindrical machine base 1, a container 3 is supported on the coil springs 2, and a rotating shaft is attached to the bottom of the container 3. A vibration motor 4 having an unbalanced weight is fixedly installed, and the container 3 is vibrated by driving the vibration motor 4. A wire mesh 5 is stretched horizontally inside the container 3. Reference numeral 6 denotes a punching plate provided below the wire mesh 5 and parallel to the wire mesh 5 at an appropriate interval. The punching plate is provided with large openings through which the material to be sieved can freely pass. Reference numeral 7 denotes an input port provided in the lid plate 8 of the container 3, through which the material to be sieved is input into the container 3 from a feeder (not shown). 9 is a discharge gutter for discharging the powder on the wire mesh 5 to the outside of the container 3;
0 is a discharge gutter for discharging the powder and granules that have fallen under the wire mesh 5 to the outside of the container 3.

[0007] FIG. 2 shows an enlarged view of the mounting portions of the wire mesh 5 and the punching plate 6, and in the same figure, 11
is an inward flange fixed to the inner periphery of the container 3 by welding, and a protrusion with a chevron-shaped cross section is formed on the lower surface of the inward flange 11, and a groove with a V-shaped cross section with which the protrusion matches is formed on the upper surface. The peripheral edge of the wire mesh 5 is sandwiched between the clamping ring 12 and the inward flange 11, and the bolt 1 is inserted.
3 is passed through the inward flange 11 and the clamping ring 12. 20 is a ring to which the outer peripheral edge of the wire mesh 5 is wound and engaged. Large diameter seat plates 14 and 15 made of an insulating material such as nylon resin are inserted into the portion of the bolt 13 that hangs downward from the clamping ring 12, with a smaller diameter seat plate 16 sandwiched between them. Board 1
A mounting piece 17 protruding from the outer peripheral edge of the punching rate 6 is sandwiched between 4 and 15, and a washer 18 is interposed below the seat plate 15, and a nut 19 is tightened. In this way, the mounting piece 17 of the punching rate 6 and the mounting hole opened therein are attached to the seat plates 14, 15,
16, the punching rate 6 is electrically insulated from the bolts 13 and the wire mesh 5.

[0008] 21 is a wire mesh 5 and a punching plate 6
In order to detect the capacitance between the cable 26 and the crimp part of the nut 19 and the punching plate 6,
When the capacitance exceeds a predetermined range, the detector 21 outputs a signal to the control panel 22 and sets off the alarm 2.
3, and the time is memorized in the timer 24, and at the same time, the vibration motor 4 and the feeder 2 are activated.
5 and the supply of the material to be sieved is stopped.

[0009] For this reason, if the wire mesh 5 breaks during operation, or if it bends significantly as a sign of breakage, the wire mesh 5,
When the capacitance between the punching plates 6 increases and the abnormal change is detected by the capacitance detector 21, an alarm is issued by the signal, and at the same time, the time is stored in the timer, and furthermore, the operation can be automatically stopped. .

[0010] In this example, a punching plate as shown in the figure was used as an electrode for detecting capacitance with the wire mesh, but such a punching plate is not necessarily required to detect capacitance. A conductive frame may also be placed under the wire mesh and used as an electrode.

【0011】

[Effects of the Invention] In this way, the present invention makes it possible to detect damage to the wire mesh in a vibrating sieve machine by changes in capacitance, so sudden damage during operation can be reliably detected and can be dealt with immediately. This has the beneficial effect of improving reliability as a machine.

[Brief explanation of drawings]

FIG. 1 is a system diagram of a vibrating sieve machine of the present invention.

FIG. 2 is a partially enlarged sectional view of the vibrating sieve machine.

FIG. 3 is a perspective view of the punching plate.

[Explanation of symbols]

1... Machine stand 3... Container 5...wire mesh 6...Punching plate 14, 15, 16... Seat board 21...Capacitance detector 22...Control panel 23... Alarm.

Claims (1)

[Claims] Claim 1: A rigid punching plate is supported at the bottom of a wire mesh stretched horizontally in the container at an appropriate distance and electrically insulated from the wire mesh, and a rigid punching plate is supported between the wire mesh and the punching plate. 1. A vibrating sieve machine comprising a capacitance detector that detects a change in capacitance of the wire mesh, and damage to the wire mesh is detected by an abnormal change in the capacitance detector.