CN201637469U

CN201637469U - Anti-cheating electronic scale

Info

Publication number: CN201637469U
Application number: CN200920278729XU
Authority: CN
Inventors: 李世金
Original assignee: KAIFENG GROUP CO Ltd
Current assignee: KAIFENG GROUP CO Ltd
Priority date: 2009-11-09
Filing date: 2009-11-09
Publication date: 2010-11-17
Anticipated expiration: 2019-11-09

Abstract

The utility model relates to an anti-cheating electronic scale, comprising a weighing sensor and a secondary meter, wherein communication connection between the weighing sensor and the secondary meter according to a certain protocol. The weighing sensor and the secondary meter are required to check address information during communication. The secondary meter can use weight signals of the weighing sensor normally only when the address information of the weighing sensor accords with the address information of the secondary meter; otherwise, the secondary meter refuses to use or cannot use weight signals of the weighing sensor. Cheating through replacing the weighing sensor with different sensitivity or the circuit board of the secondary meter can be prevented in such a way.

Description

A kind of anti-cheated electronic weighing scale

Technical field:

The utility model relates to a kind of electronic scales of practising fraud of can preventing.

Background technology:

Existing electronic scales generally is made up of LOAD CELLS and secondary instrument.LOAD CELLS converts weight to electric signal, and secondary instrument is responsible for that then this electric signal carried out digitized processing and converts gravimetric value to showing and carrying out various required functions.Because the sensitivity of every sensor is different, secondary instrument needs weight is calibrated, and the data of calibration are retained in the nonvolatile memory of secondary instrument.Like this, on the one hand under the constant situation of secondary instrument, because the sensitivity of LOAD CELLS is directly proportional with the weight indicating value, therefore as long as change the purpose that the LOAD CELLS of different sensitivity just can reach the change gravimetric value; On the other hand, under the constant situation of LOAD CELLS, the secondary instrument that also can change another electronic scales reaches the purpose that changes gravimetric value.By the LOAD CELLS of replacing different sensitivity or the wiring board of secondary instrument, just can carry out the weight cheating at an easy rate like this.

The utility model content:

The purpose of this utility model is to overcome above-mentioned the deficiencies in the prior art, provides a kind of and prevents by changing the electronic scales that LOAD CELLS or secondary instrument are practised fraud.

In order to realize the foregoing invention purpose, the utility model has adopted following technical scheme:

A kind of anti-cheated electronic weighing scale comprises LOAD CELLS and secondary instrument, carries out communication between described LOAD CELLS and the secondary instrument and is connected.

Described LOAD CELLS comprises elastic body, strainometer, analog-to-digital conversion circuit unit, sends address information memory and communicating circuit unit, is provided with in the described secondary instrument and checks address information memory and comparing unit.

Described LOAD CELLS comprises elastic body, strainometer, analog-to-digital conversion circuit unit, checks address information memory, comparing unit and communicating circuit unit, is provided with in the described secondary instrument to send the address information memory.

The utility model has following advantage with respect to prior art:

The utility model employing has the digital LOAD CELLS of unique identification coding (also being the address coding), existing LOAD CELLS is connected with ball bearing made using between the secondary instrument changes the communication connection of carrying out according to certain agreement into, the two must be according to protocol core to address information when communication, have only when the address information of the two conforms to, secondary instrument could normally use the weight signal of LOAD CELLS, otherwise, the secondary instrument refusal uses the weight signal that maybe can not use LOAD CELLS, so just can prevent the LOAD CELLS by replacing different sensitivity or utilize the different secondary instruments of changing of the calibration parameter that stores in the secondary instrument to practise fraud, and then standard the act of purchase and sale of trade market, guaranteed both parties' legitimate interests.

Description of drawings:

Fig. 1 is the structured flowchart of a kind of preferred implementation of the utility model.

Fig. 2 is the structured flowchart of the another kind of embodiment of the utility model.

Embodiment:

Referring to Fig. 1 and Fig. 2, the anti-cheated electronic weighing scale that provides according to the utility model, comprise LOAD CELLS 1 and secondary instrument 2, carrying out communication according to certain agreement between LOAD CELLS 1 and the secondary instrument 2 is connected, and the two must have only when the address information of the two conforms to according to protocol core to address information when communication, and secondary instrument 2 could normally use the weight signal of LOAD CELLS 1, otherwise secondary instrument 2 refusals use the weight signal that maybe can not use LOAD CELLS 1.So no matter more emat sensor is still changed secondary instrument, as long as address is inconsistent, electronic scales just can't use, and has reached to prevent the purpose of practising fraud.

As shown in Figure 1, as a kind of preferred implementation of the present utility model, LOAD CELLS 1 comprises elastic body 11, strainometer 12, analog-to-digital conversion circuit unit 13, sends address information memory 14 and communicating circuit unit 15, be provided with in the secondary instrument 2 and check address information memory 21 and comparing unit 22, as preferably, check address information memory 21 and comparing unit 22 and can realize that the function of compare address can realize with program with the single-chip microcomputer that carries Nonvolatile memory function and comparing function.During work, the weight of weighing is added in and makes elastic body 11 produce distortion on the elastic body 11, strainometer 12 this distortion of induction also convert thereof into faint electric signal, analog-to-digital conversion circuit unit 13 electric signal that this is faint amplifies and converts digital weight signal to, communicating circuit unit 15 sends this digital weight signal and the address information agreements in accordance with regulations that are stored in the transmission address information memory 14 to secondary instrument 2, comparing unit 22 in the secondary instrument 2 with the address information received be stored in the address information of checking in the address information memory 21 and compare, when more inequality, secondary instrument 2 refusals use this digital weight signal, and demonstration failure message, electronic scales can't be weighed, when more identical, secondary instrument 2 normal these digital weight signals that use, electronic scales normally moves.

As shown in Figure 2, as another kind of embodiment of the present utility model, LOAD CELLS 1 comprises elastic body 11, strainometer 12, analog-to-digital conversion circuit unit 13, checks address information memory 14, comparing unit 15 and communicating circuit unit 16, be provided with in the secondary instrument 2 and send address information memory 21, as preferably, check address information memory 14 and comparing unit 15 and can realize that the function of compare address can realize with program with the single-chip microcomputer that carries Nonvolatile memory function and comparing function.During work, the weight of weighing is added in and makes elastic body 11 produce distortion on the elastic body 11 on the one hand, strainometer 12 this distortion of induction also convert thereof into faint electric signal, analog-to-digital conversion circuit unit 13 electric signal that this is faint amplifies and converts digital weight signal to, transmission address information memory in the secondary instrument 2 21 sends address information to LOAD CELLS 1 simultaneously on the other hand, comparing unit 15 is checked the address information accepted the interior address information of address information memory 14 and is compared with being stored in, when more identical, communicating circuit unit 15 sends the digital weight signal of LOAD CELLS 1 to secondary instrument 2, secondary instrument 2 normal these digital weight signals that use, electronic scales normally moves, when more inequality, communicating circuit unit 15 refusals send the digital weight signal of LOAD CELLS 1 to secondary instrument, and the demonstration failure message, electronic scales can't be weighed.

Claims

1. an anti-cheated electronic weighing scale comprises LOAD CELLS and secondary instrument, it is characterized in that: carry out communication between described LOAD CELLS and the secondary instrument and be connected.

2. anti-cheated electronic weighing scale as claimed in claim 1, it is characterized in that: described LOAD CELLS comprises elastic body, strainometer, analog-to-digital conversion circuit unit, sends address information memory and communicating circuit unit, is provided with in the described secondary instrument and checks address information memory and comparing unit.

3. anti-cheated electronic weighing scale as claimed in claim 1, it is characterized in that: described LOAD CELLS comprises elastic body, strainometer, analog-to-digital conversion circuit unit, checks address information memory, comparing unit and communicating circuit unit, is provided with in the described secondary instrument to send the address information memory.