CN2039415U

CN2039415U - Portable multipoint foodstuff thermometer

Info

Publication number: CN2039415U
Application number: CN 88215110
Authority: CN
Inventors: 张晓林; 刘振铎
Original assignee: Individual
Current assignee: Individual
Priority date: 1988-10-17
Filing date: 1988-10-17
Publication date: 1989-06-14

Abstract

The utility model belongs to the technical field of temperature measurement, which is applied in the foodstuffs system, measuring the temperature of cereal stack, granary, grain bin, and foodstuffs in the sack. The portable multipoint foodstuff thermometer mainly comprises a feeler, a measuring bar, a thermometric instrument, the sleeve pipe of the measuring bar, and a handle, etc. The thermometric instrument is provided with electronic circuits. The portable multipoint foodstuff thermometer adopts an MOS integrated circuit and a liquid crystal display. The measuring bar can be dismounted and assembled according the need of users.

Description

Portable multipoint foodstuff thermometer

The utility model belongs to the temperature measurement technology field, is mainly used in the grain system, can carry out temperature detection to the grain in cereal buttress, silo, bulk grain tank and the gunnysack.

In grain system, the temperature detection of grain in the domestic grain depot is still used alcohol thermometer or mercury thermometer, and its remarkable shortcoming is that reading is unintelligible, and in the thermometer withdrawal process, reading can change, and generally will differ from one to three degree.Microcomputer has been applied in the cereal temperature detection in recent years.Use the touring cereal temperature that detects of microcomputer, temperature sensor lead will be drawn very longly, makes reading inaccurate, and lead-in wire often bumps disconnected or bitten broken by mouse.

The purpose of this utility model provides a kind of easy to carry, the measuring accuracy height, and cost is low, power saving, and the electronic thermometer that can dismantle.

Fig. 1 is a structural drawing of the present utility model.1 is measuring staff among the figure, and 2 is gauge head, 3 temperature instrumentations, 4 measuring staff sleeve pipe and handles.

Fig. 2 is an electronic-circuit diagram of the present utility model.

Fig. 3 is a schematic diagram of the present utility model.

The utility model is mainly by gauge head 2, measuring staff 1, and temperature instrumentation 3, four parts such as measuring staff sleeve pipe and handle 4 are formed, as shown in Figure 1.On gauge head 2 and measuring staff 1, temperature sensor is arranged.Temperature sensor distributes as required on the measuring staff 1.The utility model can have a joint measuring staff or a more piece, and is passable once the joint measuring staff for cereal temperature in the measurement gunnysack, then wants 3-6 joint measuring staff for the measurement of silo and bulk grain tank temperature.Be connected by double-screw bolt between each section measuring staff and measuring staff and measuring staff sleeve pipe and the handle, be convenient to the dismounting of measuring staff.Temperature instrumentation 3 is fixed on measuring staff sleeve pipe and the handle 4.The lead-in wire of the temperature sensor of gauge head 2 and measuring staff 1 is received on the temperature instrumentation 3 by measuring staff 2.Measuring staff 1 is divided into measuring point measuring staff and no measuring point measuring staff, in general, for the temperature survey of silo bulk grain tank and each buttress, can select for use a joint that the measuring staff of measuring point is arranged, and all the other are the measuring staff of no measuring point; For the measurement of cereal temperature in the gunnysack, only can select measuring staff for use at termination band measuring point.

Electronic circuit of the present utility model is by temperature sensor, A/D converter, and three parts such as display element are formed, and as shown in Figure 2, its transfer process is finished by an integrated package.Temperature sensor is transferred to electronic circuit to the temperature simulation amount that collects.Through integration type A/D transducer the temperature simulation amount is changed into digital quantity.Number amount is passed through internal counter, latch, and seven-segment decoder, driver directly drives the luminous demonstration of LCD at last, and its process is as shown in Figure 3.

Characteristics of the present utility model are with liquid crystal dut temperature to be shown.For the detection of cereal temperature, select three and half precision enough, therefore, the A/D conversion chip can be selected 7106 series for use, and temperature-measuring range is adjusted at 0-100 ℃, and temperature sensor can be selected technotron (3DJ type) for use.After each pipe is chosen, it is bonded at the measuring staff inwall respectively and is enclosed on the gauge head with epoxy resin.During use, temperature instrumentation and measuring staff are combined into needed length, insert in the measured body, turn on the power switch, see that instrument numerical value is basicly stable after, write down the temperature that this value promptly is the thing of surveying, measuring error is in ± 1% at this moment.

The utility model is compared with existing thermometer and is had the following advantages:

1, temperature probe is to be made of some sensitive elements, and these temperature-sensing element (device)s are separately fixed on measuring staff termination and the measuring staff, like this, dut temperature is not to get a point just, but surveys the mean value of a little subrange, like this, the measurement temperature is more accurate.Especially in the rural area for the measurement (Ru Guduo, harness buttress, wheat buttress etc.) of cereal, the temperature value of only getting a point is not enough science, if stylus tip (when referring to that a measuring point is contained in the tip) just in time is inserted in the straw, even might the mouldy also survey of cereal not come out like this, we have made the temperature sensor of this multi-measuring point according to customer requirements.

2, on circuit design, adopt the MOS integrated circuit, and LCD, make it power saving (change one-shot battery can with two to three years), clear reading is generous.And electronic type thermometer in the past adopts light-emitting nixie tube to show reading more, power consumption big (hundreds of milliampere), and when using in the sun, reading almost can not be recognized.

3, structurally, made detachable, synthetic plurality of sections, the user oneself is combined into the length of needs according to the measuring object different needs, the shortest is one meter, the longlyest reaches 6 meters, the user can be folded into several sections after using up, and is all very convenient for carrying and taking care of.

Claims

1, a kind of electronic thermometer, temperature sensor is arranged, display part and electronic circuit partly wait composition, it is characterized in that being distributed with temperature sensor on gauge head 2 and the measuring staff 1, described measuring staff 2 is a joint or a more piece, and can dismantle combination, temperature sensor is through the MOC integrated circuit on gauge head 2 and the measuring staff 1, the temperature simulation quantitative change is changed into digital quantity, drive liquid crystal display, measured temperature is shown.

2, electronic thermometer according to claim 1 is characterized in that being distributed with on the measuring staff 1 some temperature sensors as measuring point.