CN201382767Y

CN201382767Y - Displacement sensor for weighing segment of belt

Info

Publication number: CN201382767Y
Application number: CN200920035570U
Authority: CN
Inventors: 袁延强
Original assignee: NANJING SANAI INDUSTRIAL AUTOMATION Co Ltd
Current assignee: NANJING SANAI IPC CO., LTD.
Priority date: 2009-03-13
Filing date: 2009-03-13
Publication date: 2010-01-13
Anticipated expiration: 2019-03-13

Abstract

The utility model relates to a displacement sensor for the weighing segment of a belt, which can measure the weight of material and synchronously measure the belt displacement at the material loading segment through a belt weigher. A contact-type belt displacement sensor adopts a roller as a belt displacement detection element, so as to drive the code disc of a rotary encoder used as a signal conversion element. In the prior art, the roller is not in contact with a return stroke belt for loading material, and the belt displacement position and the measuring object weighing position are inconsistent with each other. In the displacement sensor provided by the utility model, the friction roller is in contact with the back side of the belt at the weighing segment, so that the utility model avoids the errors of belt weigher. The utility model utilizes the gravity of a counterbalance object or the tension of a spring to automatically balance the empty weight of the roller and the rotary encoder, as well as the variety of the weight of the belt and material and other vertical downward forces in a certain range, so that the consistent contact friction between the roller and the trace belt of the belt weigher can be ensured, and the disengagement between the belt and the weighting roller of the belt weigher is also prevented at the same time.

Description

Weighing section belt displacement transducer

Technical field

The utility model relates to a kind of belt conveyer scale speed measuring device, and specifically, the utility model is about detecting the sensor of belt conveyer scale trace conveying belt displacement in service, especially can being installed in the tangent displacement sensor in belt balance weighing zone.

Background technology

Belt conveyer scale is a kind of continuous integration Automatic balance, in order to the gross weight of the bulk material that obtains to pass through in the section sometime.Its principle of work is during with a bit of stroke of the every operation regular length of conveying belt, claims weight one time to the material on the conveying belt; With claim in the whole time period each time weight add up, promptly obtain gross weight.This shows that the material signal during belt balance weighing not only comprises the output signal of LOAD CELLS, also comprised the output signal of displacement transducer.

The conveying belt displacement transducer of prior art has contact and contactless two big classes.Non-contact displacement transducer is subjected to the influence of field working conditions and electromagnetic interference (EMI) bigger, uses not general at present.The present tangent displacement sensor that generally uses, with the friction roller that contacts with belt as its signal detection component, with the scrambler of the coaxial rotation of roller as its signal conversion element.The principle of work of scrambler can be based on photoelectric effect, Hall effect, magnetic induction etc.The displacement of conveying belt is directly proportional with the number of turns that roller turns over, and during the conveying belt operation, its code-disc is the pulsing signal with the roller rotation, starts the electronic sampling switch of belt balance weighing instrument, gathers the weight signal that is recorded by LOAD CELLS.

Because the conveying belt of belt conveyer scale is an elastic body, its quality also can exist inhomogeneous, and weight of material changes, and this changes with regard to the tension force that causes conveying belt, and the length of conveying belt is changed thereupon; In addition, also can there be fluctuation in the supply voltage or the frequency of supply conveying belt drive motor; This just make conveying belt displacement time differential or travelling speed can be constantly, different everywhere.

The roller of the displacement transducer of prior art does not contact with the trace belt of weighing area, mostly by himself gravity contact with return belt (Fig. 1 7), therefore the check point of weight of material and belt displacement is not or not same place, can not measure the displacement of this segment belt in the weight of material on measuring certain segment belt, this just makes the ordinary straps scale be difficult to obtain the weighing result of pin-point accuracy.

Summary of the invention

The utility model has overcome shortcoming of the prior art, and the displacement transducer mounting means of a class novelty and the structure that adapts therewith are provided.The technical scheme that the utility model is dealt with problems is: the check point as the friction roller of displacement transducer detecting element, the return belt 3 of loaded material is never changed to the section L place of weighing of trace belt 1.

For the friction roller that makes displacement transducer can contact all the time with the back side of belt conveyer scale trace belt, being unlikely simultaneously the weighing carrier roller that makes belt and belt conveyer scale again breaks away from, the utility model has utilized balancing weight or spring etc. to provide a power that makes progress by lever to friction roller, to overcome the self gravitation of the displacement transducer that comprises friction roller, and the downward component of the gravity of belt and material, belt tension etc. makes the sagging acting force of displacement transducer, and can play the self-poise effect within the specific limits.

The displacement transducer that the utility model provides, can be when trace belt 1 process of loading quilt title material 6 be weighed section L, the weight of material is loaded on the weighing unit 5 through weighing carrier roller 4, not only measure weight of material by LOAD CELLS, also simultaneously by displacement sensor load the displacement of that section conveying belt of this partial material; Thereby avoided the prior art displacement transducer, because friction roller is contacted with the return belt or the non-section of weighing of trace belt of belt conveyer scale, thereby can not the displacement of synchronous detection belt and the error brought of the thing weight of displacement measurement position.

The utility model is made after the sample, and the applicant has done a large amount of belt conveyer scale material tests, compares test with prior art displacement transducer (contacting return belt).The result who on many belt conveyer scales of different size, different flow, tests, as shown in the table:

Above-mentioned experimental data has been proved the beneficial effects of the utility model: compared with prior art, adopt the utility model can improve the accuracy of weighing.

Description of drawings

Fig. 1 is the synoptic diagram of belt conveyer scale.

Among the figure: 1-trace belt; 2-carries carrying roller; The 3-return belt; The 4-weighing carrier roller; 5-weighing unit (containing LOAD CELLS); 6-is claimed material; 7-displacement transducer roller (prior art contacts with return belt).

Fig. 2 is the front view of the structure wiring layout of the utility model embodiment;

Fig. 3 is the vertical view of the structure wiring layout of the utility model embodiment;

Among the figure: the 7-roller; The 8-lever; The 9-supporting base; The 10-bearing pin; The 11-mass; 12-mass erecting frame; The 13-rotary encoder.

Embodiment

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail:

The something in common of the utility model and prior art is, the code-disc of scrambler is by 1～2 roller transmission, and roller is as the detecting element of belt displacement, and scrambler is the conversion element of displacement transducer, is used for detected displacement is converted to pulse signal.

The difference of the utility model and prior art is, connect lever 8 on the housing of its scrambler, center section near lever is equipped with the fulcrum of bearing pin 10 as lever, fulcrum is supported by supporting base 9, the other end establishing weight erecting frame 12 of lever is so that place mass 11 (or extension spring); Supporting base 9 is installed on the shell of weighing unit 5.Adjust the weight and the arm of force (or elastic force of extension spring) of mass, make the back side contact friction of roller and belt conveyer scale weighing section belt, simultaneously unlikely again belt push up the disengaging weighing carrier roller.

In order to make roller that bigger diameter and wheel rim width be arranged, be unlikely too heavy again, that the central authorities of roller and the spoke part between the outer rim can adopt is converge like the spokes of a wheel at the hub, suitable mode such as attenuate, hollow out (among Fig. 2 be that example represent with the punching) is removed the part material.

Claims

1, a kind of weighing section belt displacement transducer, it is characterized in that: form by rotary encoder [13] and 1～2 roller [7], lever [8], counterweight or extension spring [11], the central authorities of roller cooperate with the transmission shaft of rotary encoder code-disc, bearing pin [10] is worn as fulcrum in the middle part of lever, at the rightabout two of fulcrum, lever is connected with rotary encoder shell, counterweight or extension spring and erecting frame [12] thereof respectively; This sensor construction is assemblied in the weighing section of belt conveyer scale trace belt, and roller contacts with the non-charge level that is subjected to of belt.

2, according to right 1 described weighing section belt displacement transducer, it is characterized in that: the bearing pin [10] at lever middle part places holding in the hole of supporting base [9], and supporting base [9] is fixedly installed on the shell of weighing unit [5].

3, according to right 1 described weighing section belt displacement transducer, it is characterized in that: the central authorities of roller [7] and the disc portion between the outer rim adopt the form of converge like the spokes of a wheel at the hub, attenuate or hollow out.