The electronic belt scale is still inaccurate after calibration, what is the reason?

If there is nothing wrong with the verification steps and methods, then it is necessary to find the cause from the parts. The problems encountered can be analyzed and referenced for you, mainly the speed measurement is not accurate, the millivolt value of the load cell output is not accurate enough, etc., respectively, each break. In addition, it is recommended to choose a large brand of direct sales from the factory, a company with a high reputation, and after-sales service, such as the quality of the electronic belt scale of Shengneng Technology is directly proportional.

There are many reasons for this, it may be that your belt scale is broken, or it may be caused by the bad working environment of the belt scale.

Are you not using a special calibration device? If you use something to verify it, it is easy to get inaccurate results.

How to calibrate the electronic scale and how to calibrate the electronic scale.

The belt scale is not allowed after calibration, it depends on which verification method you use, hanging code, chain code or physical object. Hanging code and chain code calibration are just simulated physical calibration, and there is a big difference in it. Mechanical vibration, belt tension influence, ambient wind temperature, belt deviation, etc., these are uncontrollable factors from the outside world.

Do not use steel wire belts for conveyor belts, the machining accuracy of the belt scale in the early stage, the position of the scale body installation, and the rigidity of the conveyor frame need to be reinforced? Does the trunnion have a response? Are the connecting reeds deformed?

Is there a tie wire leveling in the weighing scale body area? Does the roller have radial runout? Is the conveyor frame tensioner in place?

The speed measurement, the linearity of the load cell, the sensitivity and the AD accuracy of the weighing instrument all add up to the overall error of the belt scale. Lots of installation problems. After the standard installation, the belt length and verification are in the later stage, and the foundation is not good like building a house, and it is useless to talk about anything.

After the standard installation of the belt scale is completed, the length of the whole lap belt should be measured by the crank method, and the time taken to test 2-3 full turns after the belt runs stably, and the calibration cycle is automatically established in the instrument, that is, the instrument receives the speed pulse to calculate the speed of the belt.

Automatic zero point calibration, the quality of belt scale installation, and the magnitude of belt tension change can be basically reflected here. After the first pass of the zero point change, the return is 2-3 times in the run. There is no need to change here.

Many belt scale manufacturers fool customers, and every time they have to change the zero point, every time they change? How can I see the stability of the belt scale?

Automatic interval calibration or physical interval calibration, this is the same as automatic zero point calibration, the first time you change it, don't change it below. Observe the stability of the scale.

If you don't change the interval again, you have to find out the reason if it can't be stabilized. Most of it has something to do with the technical installation. Some of the attendants put it up and were done.

There will be no leveling at all, and there will be no reinforcement. The seemingly complex belt scale simplifies it. Who else cares to do it?

The market is rotten, and I don't want to serve anymore. There are many such enterprises.

It is hoped that in the future, technical exchanges will be carried out first when purchasing belt scales. One point, one point, no profit, where does the service come from.

Xuzhou Sanyuan Automated Weighing Division will answer for you.

If there is a zero problem in our electronic belt scale, it is only caused by zero drift, and the problem is not very big, as long as the starting error is subtracted. But if there is still a possibility that there is a problem with the proportions, it is not clear what is the difference between the measurement and the reality. Because the electronic belt scale is a dynamic measurement system, there is a calibration time for the zero point dilemma and loss calibration, and the error within the design range of the belt measurement cycle is considered to be qualified.

Problems caused by zero deviation need to be found, such as belt jitter, loss of pulse signal of the speed sensor, zero change of the load cell, etc. The zero deviation of the belt scale may also be due to the slight movement of the false in the process of long-term use, the wear of the belt, the zero drift of the electronic circuit itself with the change of temperature and humidity of the instrument itself, which are the reasons for affecting the zero point, so it is necessary to maintain it regularly in the process of continuous use to ensure accurate measurement; The Fengbo electronic belt weighs that the zero point can be calibrated and repeatedly. These are just some of the causes of zero problems on electronic belt scales, just to give you an example:

If the zero level shows that the flow rate is 2t h, when the actual material is 100t h, is the reality 102t h; Because of the different reasons, you can also refer to the "electronic belt scale calibration needs to pay attention to what problems", therefore, the actual material is also in doubt, the simple way is to often carry out dynamic zero on the electronic belt scale, Wang Shen to ensure that the zero is within the normal range.

The interval calibration of the belt scale is actually the calibration of the scale star in the popular sense.

Zero point calibration is to peel, when the load cell is installed, the scale frame, roller bracket, the belt on the metering section, we have to zero their wheel cheats, for example, the zero output of the bridge round weight sensor is 6mv after the force, then we have to treat the value of 6mv as 0. However, the uneven thickness of the belt on the belt conveyor, the vibration after operation, the weight tensioning and the radial runout of the idler will affect the output of 6mV, so when the zero point is calibrated, the flow rate will occur. However, the zero point is the average value of the entire belt, as long as the accumulated zero error value of the last lap is within the standard range.

Interval calibration is when the hanging code or chain code is calibrated, the load cell will output a MV value after the force, for example, 10mV, compared with the zero output is changed by 4mv, open the belt, through the formula chain code per kilogram per meter belt speed to obtain the instantaneous flow rate on the current belt, which is generated by the change of 4mv force. Due to the linear variation of the load cell, the MV value varies depending on the weight of the material. Proportional calculations can be performed to weigh the value of the MV of the load cell and the flow rate.

Xuzhou Sanyuan automation technology **** for you to solve the Lahua answer.

Belt scale interval calibration refers to the process of comparing the indication value of the belt scale display instrument with the actual instantaneous conveying volume and cumulative amount of the belt conveyor. When inspecting the calibration of the belt scale, first check whether the components are in the initial state, the main and attached lifting mechanism molds should be in the lifting position, the two groups of A and B grasping mechanisms should be in the closed state of grabbing the code, and the crank top is in a falling state. Check whether each part is in its initial state:

The main and attached lifting mechanism should be in the lifting position, and the two groups of code grabbing mechanisms should be in the closed state of grabbing the code A, and the two groups of code grabbing and b. The crank jacking mechanism is in a falling state. Check the connection of each component and check whether there are any objects on the device that affect the operation.

Check whether the 380V three-phase power supply circuit is normal. Turn the control cabinet on, push the air switch up, and check if the 24V power indication is normal.

At present, most users generally use electronic belt scales for measurement, and its advantage is that it can dynamically measure the materials transported by the belt in operation, and it is really good to use it for process measurement and ratio batching. Since the belt scale uses to measure the instantaneous weight on the belt conveyor, at the same time measure the running speed of the belt, and then use the mathematical model to make an integral estimate, due to the tension of the belt when running. Humidity.

The effects of instantaneous weight and wear, coupled with the difficulty of instantaneous dynamic weight and velocity measurements, can only be a dynamic mathematical estimation that produces estimation errors. Since it is an error, it may be a positive error or a negative error, but the belt scale is often a negative error, which is mainly caused by the "belt effect" caused by the influence of temperature and other factors. Due to the price of **, at the moment on grain.

For the measurement of materials such as coal that require slightly higher measurement accuracy, belt scales are obviously not suitable.

We use two fixed electronic scales to measure the materials transported by bulk material transportation, and change the dynamic measurement to static measurement. In addition, PLC control, weighing control instruments, computer records, etc. constitute an automatic control continuous metering system, which changes dynamic to static. It does not affect the transportation volume of the original belt, and achieves high-precision measurement.

The adjustment is simple, the measurement accuracy is higher, and it fully meets the national commercial standard. (Patent number: Pearl River Electronic Weighing Apparatus ****.)

1.Choose the right installation location. As we all know, the environmental conditions (including interference, humidity, vibration, space and other factors) that need to operate are different for electronic belt scales, so the conditions that need to be achieved for the location of the installation scale rack are small vibration and interference, suitable humidity, and easy maintenance.

2.Pay attention to the fastening screws. After the manufacturer purchases the belt scale, the uneven road will cause the screws on the scale frame to loosen during transportation, so in order to avoid shaking during operation, the screws need to be tightened during commissioning.

3.Ensure the installation of the load cell. Install the load cell on the scale frame, tighten the screws as well, and adjust the position of the sensor to achieve a uniform force.

4.Install the scale frame correctly. To be mounted on the belt rack, they must be placed in a horizontal position to ensure that the force on the belt frame is relatively even, and the screws must also be tightened.

5.Connect the cables. Connect the signal cables of the weighing and speed sensors, and do not install them in a strong electric environment, and remember that the joints of the wires should be protected to prevent failures such as short circuits or disconnections.

6.Peeling. After the installation of the electronic belt scale, the empty belt is required for operation, the weight of the belt is recorded, and then the skin is removed.

7.Demarcate. The belt scale is calibrated by hanging code, chain code or physical object.

8.Training of operators. The staff needs to learn the basic knowledge of the operation and maintenance of the electronic belt scale, ensure that the work during the operation of the electronic belt scale is completed proficiently, and ensure its normal operation.

What is the zero point and interval of a belt scale.

How to calculate the deviation between the physical calibration of the belt scale and the chaincode calibration.

A detailed explanation of the belt scale repair and 2105 weighing indicator calibration steps.

Xuzhou Sanyuan belt scale after-sales service department will answer for you.

1.Adjust the zero point.

It can be adjusted 2-3 times as needed until the zero point is stable.

2。Check interval.

The interval value of the belt scale can be adjusted by means of hanging code, chain code or physical verification.

For specific details, you can contact the sales department of ZTE Sanyuan belt scale to request a technical manual.

Shandong Jinpeng weighing equipment, excellent quality, low quality, perfect after-sales service.

Start by placing a knowing how many grams on top of it, then adjust slowly.

Before the zero point calibration of the belt scale, check the parameters of each component and instrument. Clean up the stuck coal or other foreign objects on the scale body.

Idling the belt for a period of time can clean up the coal attached to the belt and adjust the deviation.

Belt scale chain code calibration steps: (take Xuzhou 2105 belt scale instrument as an example).

In menu 2, calibrate the data, put the scale model (17 or 14), the verification method: chain code, and the weight of the chain code are entered correctly. Find the automatic creation of calibration intervals, record the belt length, the number of calibration laps and the time.

Easy to view later. The length of the belt is measured using the crank method, as the chain code calibration calculates the simulated load from the length of the belt. The inaccurate length of the belt affects the accuracy of the belt scale.

The chaincode also needs to be precise). After the speed of the opening belt is stable, the cycle can be established, where the belt can not deviate, and the deviation must be adjusted well, otherwise it will affect the zero point and interval calibration. The establishment period is mainly for the instrument to receive the tachymetric pulse to calculate the belt running speed.

As long as the speed sensor is not replaced in the future, this step can be eliminated for the next calibration of the weighing instrument, belt or main motor drive drum. If you want to check whether there is a problem with the speed measurement or clean up the accumulation on the belt, you can add this step, I think this step is still very necessary. If the above parts are replaced, the input of each parameter must be re-measured, and the cycle will be re-established.

Automatic zero point calibration in menu 1: After the belt speed is stabilized, press the start button, press change after the countdown is completed, and the new zero point value will be automatically input to the meter. Because the tare weight, belt tension, outside temperature and other factors are different each time it is calibrated.

After changing once, return to run 2-3 times, and do not need to change after the completion of these 2-3 times, to see the stability of the scale. If the deviation is large every time, it is necessary to find the reason.

Automatic interval calibration in menu 1: tiling the chaincode, the chaincode should completely cover the belt scale, and the standard chaincode length should cover the belt scale and cover the front and back sets of roller racks of the scale body. This step is very important, otherwise the force will be different.

Suppose a 30 kg m chaincode only covers 29 kg m, but it should be calibrated as 30 kg m. The verified data will be higher than the actual value. The chaincode and belt must not be mistracked during calibration.

If the deviation is to be adjusted, recalibration. After the countdown is completed, press change, change once and return to run 2-3 times, this 2-3 times do not need to be changed after completion, see the stability of the scale. If the deviation is large every time, it is necessary to find the reason.

The calculation method of the simulated load is as follows: number of kilograms per meter of chain code Length of single-turn belt Number of checks 1000

Instantaneous flow = number of kilograms per meter of chain code Belt speed 3600 1000

Use these two formulas to see if the data displayed on the meter is correct during the chaincode check. If it is correct, it means that the parameter input is correct, if it is not correct, please see if there is any incorrect input in the calibration data such as the scale model, calibration method, and chain code weight.