How to choose the chain code of calibration belt scale, what is the interval calibration of belt sca

The selection method of calibrating the chain code of the belt scale: according to the requirements of the verification of the electronic belt scale, the specification of the chain code can take 80% of the maximum flow point of the corresponding belt conveyor as the high load, and take 20%-40% of the maximum flow point of the corresponding belt conveyor as the low load.

Looking for a belt scale manufacturer, you need to look at the qualification. Qualification certificates in the industrial field include manufacturing measuring instrument license, national industrial product production license, security engineering enterprise qualification certificate, etc., if there is a high risk of flammable and explosive workplaces, it is also necessary to obtain coal safety certification, explosion-proof certification, etc. There are many manufacturers on the market who do not have qualification certification, in order to sell products and forge certification, so when choosing a manufacturer, you must carefully distinguish the authenticity of the certificate according to the product, including whether the certification period has expired.

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Depending on how much traffic you actually use.

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.

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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.

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.

According to the current international recommendations (OIML R50:1996), the national metrology verification regulations (JJG195-2002), the national standard (GB T 7721-2007), the electronic belt scale is graded, level 1, level 2 three accuracy levels, that is, the dynamic cumulative error of automatic weighing materials is required to be not greater than in use; The allowable error of the initial verification and subsequent verification is half of the above-mentioned indicators, that is, they are not greater than. In other words, the accuracy of a scale should be equivalent to the long-term allowable error.

Users should have a clear understanding of this, because some belt scale manufacturers intentionally or unintentionally confuse the two, and use the indicators required by the verification to pass off the accuracy level; What's more, the performance of the belt scale is very susceptible to the impact of the environment and working conditions, so only the belt scale with excellent durability can reliably and stably maintain the corresponding performance requirements of its accuracy level for a long time, and it is not just the calibration data at the time of delivery.

At present, there are belt scales with higher accuracy in China. For a grade of belt scale, the index should be maintained for a long time, and the error of verification is not greater. As for the so-called belt scale, it stands to reason that the maximum allowable error during its reliable service life should not exceed (this indicator is better than the common Class III non-automatic scale, how much confidence is there?!).

For high-precision belt scales, please choose Chengde Guangfeng.

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 ****.)

Hello, it is a pleasure to serve you and give you the following answer: A belt scale encoder is a device used to measure the load of a belt scale, it can detect the load of the belt scale and convert it into an electronic signal for further processing. The function of the belt scale encoder is to detect the load of the belt scale rock and convert it into an electronic signal for further processing.

Its function is to detect the load of the belt scale and convert it into an electronic signal for further processing. If there is a problem with the belt scale encoder, it may be due to the excessive or underload on the belt scale, or due to a malfunction of the belt scale's encoder itself. Workaround:

1.First of all, check if the load on the belt scale is too large or too small, and if so, you should adjust the load on the belt scale to ensure that the encoder of the belt scale can work properly. 2.

Secondly, check whether the encoder of the belt scale is faulty, if so, the encoder of the belt scale should be replaced in time to ensure that the encoder of the belt scale can work normally. Personal tip: A belt scale encoder is an important measuring device that detects the load on the belt scale and converts it into an electronic signal for further processing.

Therefore, when using the encoder of the belt scale, Changque should pay attention to check whether the load of the belt scale is too large or too small, and whether the encoder of the belt scale is faulty to ensure that the encoder of the belt scale can work properly.

The data obtained by the same belt scale through chain code and hanging code calibration is not the same. Here's why:

The code verification only acts on the load cell, and the roller and belt are not in contact.

The chain code check acts on the belt, then the force is transmitted to the idler, and the scale body is on the load cell. There is a strong deviation between the hanging code and the chaincode check.

Compared with the physical calibration, the chaincode is more accurate than the hanging code.

When calibrating the physical object, the linearity of the load cell, the rigidity of the scale body and the frame, the pulse of the speed measurement, the tension change of the belt, the belt deviation and mechanical vibration, the external temperature environment and so on are all considered.

Therefore, the physical object is higher than the chaincode, and the chaincode is higher than the hanging code.

However, the stability of the belt scale overrides all calibration, and it makes no sense to calibrate the unstable belt scale in any way. Most of the instability has something to do with the technical installation. Some of the attendants put it up and were done.

There is no leveling at all, and there is no reinforcement, and some do not even understand where the belt scale is installed. The seemingly complicated installation of belt scales simplifies it. Who else cares to do it?

Xuzhou Sanyuan Automated Weighing Division will answer for you. Welcome to call the technical exchange.

Mainly according to the bearing mode of the scale body and the performance of the weighing display, if both are high-quality, the error between the general weight comparison and the running chain code is 1-2%, if both are the public quality, the error between the weight comparison and the running chain code is 10-12%. One more thing to note: the belt is within the standard range.

You're talking about calibration factors, right? It's definitely a little different, but if the school is doing well, the values shouldn't be much different.

The calibration of the electronic belt scale is related to the accuracy of use, and it is very important to choose the appropriate calibration method, and the calibration method of the electronic belt scale can be mainly divided into the following types:

1.Hanging code verification. This is a more traditional calibration method, the calibration accuracy is relatively low, if the accuracy of the belt scale is not high, you can choose this calibration method.

2.Chaincode validation. The method of chain code verification belt scale is more convenient, and the time is relatively short, but the inspection accuracy is not very high when the cycle chain code simulates the material to verify the belt scale.

3.Offline physical verification. In other words, this is a verification method to compare the weighing value of the belt scale with the weighing value of the ground punch car scale. After the belt scale has weighed the material, the material will be weighed.

Collect it, put it on the ground scale and re-weigh it for comparison, and at the same time correct the loose weighing error of the belt scale (the ground scale needs to be a verified and qualified scale). Although the accuracy of this verification method is higher than that of hanging code and chain code verification, it is more troublesome to operate than letter holes.

This is by far the most accurate method of calibration accuracy, it is the use of a set of physical detection as the control scale for calibration, but this detection method is more expensive than the first three.

To calibrate the electronic belt scale, you need to select the calibration equipmentGuonuoxinkeProvide winch chain code verification, hanging code verification, automatic cycle chain code verification, rolling code verification, etc.