CN203767528U

CN203767528U - Conveyor belt jamming protection system

Info

Publication number: CN203767528U
Application number: CN201320871585.5U
Authority: CN
Inventors: 张新建; 闫林华; 徐孟虎; 高纪立
Original assignee: ZHENGZHOU RONGQI THERMOELECTRICITY ENERGY CO Ltd
Current assignee: ZHENGZHOU RONGQI THERMOELECTRICITY ENERGY CO Ltd
Priority date: 2013-12-27
Filing date: 2013-12-27
Publication date: 2014-08-13
Anticipated expiration: 2023-12-27

Abstract

The utility model provides a conveyor belt jamming protection system, and belongs to the field of a feed belt safety protection system. A current acquisition circuit and an electromagnetic relay are arranged on a power line of a driving motor of a conveyor belt, and the system also comprises a comparator, a memory comparator and an AND gate circuit, wherein the input end of the comparator is electrically connected with the output end of the current acquisition circuit; the input end of the memory comparator is electrically connected with the output end of the current acquisition circuit; the output end of the AND gate circuit is electrically connected with the control input end of the electromagnetic relay; the two input ends are respectively and electrically connected with the output end of the comparator and the output end of the memory comparator. The system has the beneficial effect that with the adding of one judging condition, the electromagnetic circuit is controlled to be disconnected only under the circumstance of meeting two conditions, so that the generation of maloperation in motor start is guaranteed.

Description

A kind of belt jam protection system of transporting

Technical field

The utility model relates to feed belt safety system, relates in particular to a kind ofly transporting the protection system that prevents belt tear fracture when belt runs into jam.

Background technology

The driving of transporting belt generally drives by drive motor, if when sports belt runs into jam in operational process, the pulling force of drive motor may be broken transporting belt.When running into belt jam, drive motor electric current also can increase thereupon, when electric current increases to a certain degree, drive motor can be given and to be burnt out, very likely can cause extremely serious work safety accident, for producing, also will cause no small loss simultaneously.

In order to solve the above problems, available technology adopting belt jam protection system technical scheme as shown in Figure 3, on the electric wireline of drive motor 1 that transports belt, be provided with current collection circuit 2 and electromagnetic relay 3; Also comprise a comparator 4, the mouth of the input end of comparator 4 and current collection circuit 2 is electrically connected, and the control input end of mouth and electromagnetic relay 3 is electrically connected.Described comparator 4 can arrange current threshold, when the current value receiving is greater than this setting current threshold, the value that will export control signal is 1, and then control electromagnetic relay 3 disconnects, to prevent that the electric current of drive motor 1 from continuing to increase, and results in greater loss or cause serious industrial accident.

This belt jam of prior art protection system; although can prevent that belt jam from causing electric current to increase and making electromagnetic relay 3 tripping operations, when drive motor 1 starts, its starting current is generally also larger; likely can surpass the current threshold of setting, and cause malfunction.

Utility model content

The purpose of this utility model is the problem for above-mentioned existence, provides a kind of and is transporting the protection system that prevents belt tear fracture when belt runs into jam.

The technical solution adopted in the utility model is: a kind of belt jam protection system of transporting is provided with current collection circuit and electromagnetic relay on the electric wireline of drive motor that transports belt; Also comprise a comparator, the input end of comparator and the mouth of current collection circuit are electrically connected; Also comprise a memory comparator and an AND circuit, the input end of described memory comparator and the mouth of current collection circuit are electrically connected; The mouth of described AND circuit and the control input end of electromagnetic relay are electrically connected, and two input ends are electrically connected with the mouth of comparator and the mouth of memory comparator respectively.

The beneficial effect of technical solutions of the utility model: increase a Rule of judgment, all just can control electromagnetic relay in satisfied situation when two conditions and disconnect, guarantee to produce malfunction when starter motor.

Accompanying drawing explanation

Fig. 1 is the schematic diagram of the utility model embodiment.

Fig. 2 is a kind of schematic diagram of remembering comparator in prior art.

Fig. 3 is the schematic diagram that transports belt jam protection system in prior art.

The specific embodiment

Below in conjunction with accompanying drawing, the utility model is described in detail.

In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.

The a kind of of the present embodiment transports belt jam protection system as shown in Figure 1, on the electric wireline of drive motor 1 that transports belt, is provided with current collection circuit 2 and electromagnetic relay 3; Also comprise a comparator 4, the mouth of the input end of comparator 4 and current collection circuit 2 is electrically connected; Also comprise a memory comparator 5 and an AND circuit 6, the mouth of the input end of described memory comparator 5 and current collection circuit 2 is electrically connected; The control input end of the mouth of described AND circuit 6 and electromagnetic relay 3 is electrically connected, and two input ends are electrically connected with the mouth of comparator 4 and the mouth of memory comparator 5 respectively.

Memory comparator 5 be a kind of can be by calculating its of the current value growth ratio that on current value ratio this moment, collects a moment, it compares growth ratio and preset value, when growth ratio is more than or equal to preset value, export 1, when growth ratio is less than preset value, export 0.Fig. 2 is a kind of schematic diagram of remembering comparator of the prior art, and memory comparator 5 comprises first memory 50, second memory 51, sampling module 52 and calculator 53.The mouth of the input end of described sampling module 54 and current collection circuit 2 is electrically connected, and mouth and first memory 50 input ends are electrically connected, and gather the current value of primary current Acquisition Circuit 2 outputs every 0.1～1S; The mouth of first memory 50 is electrically connected with the input end of second memory 51 and the first input end of calculator 53 respectively, the current value gathering for store sample module 54 is exported the current value I of storage 1 when receiving a current value by output port; The second input end of the mouth of second memory 51 and calculator 53 is electrically connected, and the current value transmitting for storing first memory 50 is exported the current value I of storage 2 when receiving a current value by output port; Calculator 53 exports 1 when (I2-I1)/I1 >=￡, when (I2-I1)/I1 < ￡ output 0.￡ value in the present embodiment is 0.02～0.05.

Only having output valve when comparator 4 is 1 and memory comparator 5 while being also 1, control output end 3 inputs of electromagnetic relay 3 be only 1, now control electromagnetic relay 3 and disconnect.

The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection domain of the present utility model.

Claims

1. transport a belt jam protection system, on the electric wireline that transports the drive motor of belt (1), be provided with current collection circuit (2) and electromagnetic relay (3); Also comprise a comparator (4), the mouth of the input end of comparator (4) and current collection circuit (2) is electrically connected; It is characterized in that, also comprise a memory comparator (5) and an AND circuit (6), the mouth of the input end of described memory comparator (5) and current collection circuit (2) is electrically connected; The control input end of the mouth of described AND circuit (6) and electromagnetic relay (3) is electrically connected, and two input ends are electrically connected with the mouth of comparator (4) and the mouth of memory comparator (5) respectively.