JPS5841245B2 - variable speed conveyor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a conveyor that straddles a conveyor between double rows of rotatably wound media, and more particularly to a rotational deviation detection device for double rows of rotatably wound media.

Sedimentation basins (including sedimentation basins), etc. can be equipped with scraper conveyors for scraping sediment by installing scrapers serving as conveyors at equal intervals between two rows of rotating chenos. many.

A conventional method of taking over a scraper conveyor (hereinafter referred to as a scraper) for scraping up sediment will be explained with reference to FIGS. 1 and 2.

Chain wheels 2a and 2b are placed on both sides of the sedimentation tank 1,
A and 3b are tensioned so as to be rotatable, and a plurality of scrapers 4 are attached to the chain wheels 3a and 3b by extending them at equal intervals, and the chain wheel 2a is attached to the chain wheel 2a.
, 2b are mounted with a load cell 5, and a proximity detector 6 connected to a timing device is provided on one side of the passage zone of the scraper plate 4 so as to face it.

This allows for abnormalities in the raking machine to be detected even from a remote location.

However, this method has the drawback that if a phase shift occurs between the left and right chinos due to an abnormality, when one chino breaks, or when one of the scrapers comes off, the abnormality is not detected and operation continues. There were drawbacks such as failure to detect abnormalities when the rotation speed of the chino changed.

In view of the above-mentioned drawbacks, it is an object of the present invention to provide a conveyor with a double-row check 7 that can detect out-of-phase between the left and right chains, detachment of the attachment part of the conveyor, etc. even if the conveyor is made variable speed.

The purpose of this invention is to provide a pulse device that emits a fixed number of pulses each time at the output end of the variable speed drive device of the conveyor, so that both ends of the conveyor face the track on which they rotate together with the chino, that is, the passage zone at both ends of the conveyor. A pair of proximity detectors are provided symmetrically.

There is a preset counter for the number of pulses that sets the maximum flame for the transport tool to pass through the detection area of this proximity detector, a preset counter that sets the maximum gap between the transport tools, and a preset counter that sets the maximum different phase between the left and right ends of the transport tool. is connected to the pair of proximity detectors with an OR gate, a preset counter set with the maximum different phase is connected to an AND gate, and these preset counters and an abnormality signal device are connected.

The abnormality signal transmitting device is activated when the checker 7 slips, stretches, breaks, or has a different phase.

The configuration of an embodiment of this invention will be explained based on the drawings.

FIG. 3 is a plan view of a conveyor according to an embodiment of the present invention, and FIG.
5 is a block diagram of the abnormality detection device, and FIG. 6 is an operation diagram.

In Figures 3 and 4, the output end of the variable speed drive 8 to which the conveyor 7 should be connected has a fixed number each time (the larger the number, the better).
A pulse device 9 is provided which generates a pulse of .

The conveyor 7 has main chain wheels 10a and 10b rotatably attached to a main shaft which is transmitted to the variable speed drive device 8, and a driven chain wheel 11a rotatably fitted to another shaft.

11b, and these chain wheels 10a, 11a and 10b.

Rotating chairs 712a and 12b that can be hung on 11b respectively
, a plurality of conveyance tools 13 installed by hanging them at equal intervals between the checks 712a and 12b, and a pair of symmetrical proximity detectors 14a, 1 facing on both sides of the rotation passage zone of the conveyance tools 13.
4b, and an abnormality detection device 15 connected to the proximity detectors 14a, 14b and the pulse device 9.

In FIG. 5, the inside of the abnormality detection device 15 is shown, and there is an abnormality signal device 16 therein, and the count-out relay of the preset counter 171819 connected to the pulse device 9 is connected to the abnormality signal device 16.

The preset counter 171819 is the proximity detector 1
The preset counter 17 connected to the OR gates 4a and 14b clears the count when the input of the signal from the OR gate stops, but when the count exceeds T1, the relay is activated.

The count T1 is set based on the length of the detection area and the movement limit of the conveyor due to chain elongation.

The preset counter 18 includes proximity detectors 14a, 14
It has a connection circuit between B and an AND gate, and the signal input to the AND gate clears the count, but when the count exceeds T2, the relay is activated.

The count T2 is set based on the different phase limit at the front of the carrier.

The preset counter 19 clears the count each time the OR gate signal is input and starts at 0, but when the count exceeds T3, the relay is activated.

Curtain 1-T3 is set with a limit due to chain elongation in the mounting interval of the conveyor 13.

Next, the operation of the above configuration will be described.

The pulse device 9 has main chain wheels 10a, 10b and a driven chain wheel 11.
a.

The length by which the checks 712a and 12b and the conveyor 13 should be rotated is expressed in units of pulse numbers.

The detectors 14a and 14b are a check 712a. It is detected that the end of the conveyor 13 rotating together with the conveyor 12b passes a specific point on the conveyor 7.

The front of the carrier 13 enters the detection area and the proximity detector 14
The signal Sa detected and transmitted by a (either 14a or 14b is fine, but here it is assumed that 14a comes first)
The preset counter 17.1 via the or gate
8.19 and each counts the number of pulses emitted by the pulse device 9.

As the carrier 13 further advances, the signal s is output from the proximity detector 14b.
This signal sb is input to the preset counter 18 via an AND gate.

The preset counter 18 receives input from the OR gate side.
The number of pulses t2 is counted before the input on the AND-CATE side, and this t2 indicates the different phase on the left and right sides of the carrier. If the different phase is small, t2<T2 (the set tolerance limit for different phases), and the pulse count is cleared to O. Ru.

When t2>T2 due to detachment of the attachment part of the conveyor 13, meshing slip between the chain 7 and chain wheel, disconnection of the chain 7, etc., the abnormality signal device 16 is activated via a relay.

The carrier 13 further advances and the proximity detector 14a is detected.

14b, the preset counter 1
The signal Sa input to 7 is stopped, and the input of the signal sb is also stopped.

The preset counter 17 counts 11 pulses until the signal is input from the OR gate and stops.
indicates the length between the detection area and the carrier 13, and when the carrier 13 normally passes through the detection area, tl<TI (set abnormality tolerance limit) and the pulse count is cleared to O.

If tl>TI due to a malfunction in the transmission part, meshing slip between the chain 7 and chain wheel, chain disconnection, etc., the abnormality signal device 16 is activated via a relay.

Furthermore, the chees 712a and 12b rotate to carry the following conveyor 13.
enters the detection range of the proximity detectors 14a, 14b,
The signal Sa or sb is again input from the OR gate to the preset counters 17, 18, and 19.

The preset counter 19 counts t3 as the number of pulses during the interval in which the signal is input from the OR gate, and counts this t3.
3 indicates the rotational gap of the carrier 13, and when t3<T3 (the set interval tolerance limit), the pulse count returns to O and starts counting again.

If the progress of the conveyor is delayed due to a failure in the transmission part, meshing slip between chain 7 and chain wheel, chain breakage, etc., t3
≧T3, the preset counter 19 activates the abnormality signal device 16 via the relay.

As described above, this invention provides a pulse device at the output end of the drive unit of a variable speed conveyor, symmetrically provides proximity detectors on both sides of the conveyor, and provides a preset counter via an OR gate and an AND gate. Even if the conveyor speed is within the proximity detection area or outside the detection area, it is possible to compare the drive speed, the conveyor speed, and the different phases on the left and right sides, so even if the conveyor speed is changed, cutting of the check 7 and slip conveyance can be avoided. A variable speed conveyor for double-row wound media was obtained that can freely detect dislodging of tools, abnormal phase, etc.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a conventional double-row chain conveyor, FIG. 2 is a view taken along arrow A-A in FIG. 1, FIG. 3 is a plan view of a conveyor according to an embodiment of the present invention, and FIG. The arrow BB diagram, FIG. 5 is a control block diagram, and FIG. 6 is a diagram showing a count chart. 8: Variable speed drive device, 9: Pulse device, 10a. 10b: main chain wheel, 12a, 12b: check 7.13: conveyor, 14a, 14b: proximity detector, 16: abnormality signal device, 17, 18, 19 nib reset counter.

Claims (1)

[Claims] 1. In a conveyor having a variable speed drive device in which a conveying tool is hung between double rows of chains that are rotatably suspended, a pulse device 9 is provided at the output end of the variable speed drive device 8, and a pulse device 9 is provided on both sides of the conveyor 7. A pair of proximity detectors 14a and 14b are provided facing the passage zone at both ends of the conveyor 13 that rotates with the chino,
The proximity detectors 14a and 14b are connected to a counter 17 in which the transportation tool passing length TI is set, a counter 19 in which the transportation tool gap T3 is set, and a counter 18 in which the difference in phase T2 at both ends of the transportation tool is set. The detectors 14a, 14b and the counter 18 are connected via an AND gate, and the pulse device 9 and the counter 1γ, 18
．． 19 in parallel, counter 17.18.19
A variable speed conveyor characterized in that the output side of the conveyor and an abnormality signal device 16 are connected in parallel.