A non-continuous cumulative weighing instrument large tonnage weightless calibration system and method

Abstract

The present invention discloses a non-continuous cumulative weighing instrument large-tonnage weightless calibration system and method, the system includes an electromagnetic power meter, a weighing lever, a lever support and a constant current source, the electromagnetic power meter is fixed on a platform, the lever support supports the weighing lever at the axial lower end of the weighing lever, an angle measuring device is arranged on the upper end surface of the weighing lever, the angle measuring device is used to measure the deflection angle of the weighing lever with the lever support as the support point, one end of the weighing lever is rotatably connected and fixed with the tension column of the electromagnetic power meter through a first axle pin, the other end of the weighing lever is rotatably connected and fixed with the connecting column set with the calibrated weighing hopper through a second axle pin, and the constant current source is connected to the electromagnetic power meter. The present invention realizes that the mass of the loading station can be calibrated without weights, improves the mass calibration efficiency of the loading station, eliminates the need for long-distance transportation of weighing weights for calibration, and improves the mass calibration accuracy of the loading station.

Description

Technical Field

[0001] The invention relates to a large-tonnage weightless calibration system and method for a discontinuous cumulative weighing instrument, which is a large-tonnage weightless calibration system and method for a discontinuous cumulative weighing instrument based on calibrating an electromagnetic power meter with a Planck constant. Background Art

[0002] Loading stations generally need to use large 1000Kg weights for quality calibration on a regular basis, and the weights are generally stored at fixed points. When the loading station needs to be calibrated, the large weights need to be transported to the site. The general transportation distance is relatively long and time-consuming. In addition, during the storage process, the weights will be exposed to moisture for a long time, and the quality of the weights will be lost to a certain extent. This also causes certain errors in the quality calibration process of the loading station. Since the above problems have not been well solved, the quality calibration of loading stations has been plaguing enterprises for a long time. Summary of the invention

[0003] The purpose of the present invention is to provide a large-tonnage weightless calibration system and method for a discontinuous cumulative weighing instrument, which is a large-tonnage weightless calibration system and method for a discontinuous cumulative weighing instrument based on the Planck constant for calibrating an electromagnetic power meter.

[0004] In order to achieve the above object, the scheme of the present invention is:

[0005] A large-tonnage weightless calibration system for a discontinuous cumulative weighing instrument, wherein the system comprises an electromagnetic power meter, a weighing lever, a lever support and a constant current source, wherein the electromagnetic power meter is fixed on a platform, the lever support supports the weighing lever at the axial lower end of the weighing lever, an angle measuring device is arranged on the upper end surface of the weighing lever, the angle measuring device is used to measure the deflection angle of the weighing lever with the lever support as the support point, one end of the weighing lever is rotatably connected and fixed to the tension column of the electromagnetic power meter through a first axle pin, the other end of the weighing lever is rotatably connected and fixed to the connection column provided with the calibrated weighing hopper through a second axle pin, and the constant current source is connected to the electromagnetic power meter; wherein: the electromagnetic power meter is an electromagnetic power meter having a fixed relationship between a standard magnetic pull and an input current value formed by calibration, the lever support is provided with a first lifting and lowering adjustment mechanism, and the first lifting and lowering adjustment mechanism is used for horizontal correction of the weighing lever.

[0006] A further solution is that the tension column of the electromagnetic power meter is provided with a second lifting and adjusting mechanism, and the first lifting and adjusting mechanism and the second lifting and adjusting mechanism are used together for horizontal calibration of the weighing lever.

[0007] The solution is further as follows: the weighing lever is axially provided with a long slide groove, the lever support is slidably arranged in the slide groove, and the sliding arrangement is used to change the support point of the lever support for the weighing lever, and the calibration weighing is changed by changing the support point according to the torque balance formula.

[0008] The solution is further as follows: there are multiple standard magnetic pulls, and the multiple standard magnetic pulls are in a fixed relationship with the multiple input current values. Different input current values ​​are changed to change different standard magnetic pulls. According to the torque balance formula, different standard magnetic pulls formed by changing different input current values ​​are used to change the calibration weighing.

[0009] The solution is further as follows: the first lifting and adjusting mechanism includes a lever support base, a vertical hole is arranged on the lever support base, a rotatable first adjusting nut is arranged at the upper end of the vertical hole through a limiting groove, the lever support is screwed into the first adjusting nut through a thread, and the lifting and lowering of the lever support can be controlled by rotating the first adjusting nut.

[0010] The solution is further: the second lifting and adjusting mechanism includes an adjustment base and a tension column extension rod fixedly connected to the tension column of the electromagnetic power meter, one end of the tension column extension rod is used to connect with one end of the weighing lever, a vertical through hole is arranged on the adjustment base, and a rotatable second adjusting nut is arranged on the vertical through hole through a limiting groove, the tension column extension rod is screwed into the second adjusting nut through a thread, and the lifting and lowering of the tension column extension rod can be controlled by rotating the second adjusting nut.

[0011] A large-tonnage weightless calibration method for a non-continuous cumulative weighing instrument is a calibration method based on the weightless calibration system, wherein one end of a weighing lever is rotatably connected and fixed to a connecting column provided with a weighing hopper to be calibrated via a second axle pin, and a tension column of the electromagnetic power meter is provided with a second lifting and lowering adjustment mechanism. First, the connection between the tension column of the electromagnetic power meter and the other end of the weighing lever is disconnected; wherein, the supporting point of the lever support on the weighing lever is determined according to the torque relationship between the calibration weight and the standard magnetic tension of the electromagnetic power meter, and then zero point calibration and weighing calibration are performed;

[0012] The zero point calibration sequence is: empty the weighing hopper, adjust the weight display to "0", then support the lever support at the supporting point of the weighing lever, adjust the first lifting adjustment mechanism so that the reading value of the angle measuring device is "0", that is, the weighing lever is in a horizontal state; then, adjust the second lifting adjustment mechanism so that the tension column of the electromagnetic power meter is just connected and fixed to the other end of the weighing lever through the first shaft pin;

[0013] The weighing calibration is as follows: inputting a current of standard magnetic pulling force into the electromagnetic power meter to form a calibrated weight pulling force on the other end of the weighing lever, at which time the weighing lever tilts toward the electromagnetic power meter and loses its horizontal state; filling the weighing material into the weighing hopper, reading the degree value of the angle measuring device, when the degree value is "0", that is, the weighing lever is in a horizontal state, the weighing material filled in is the weight to be calibrated; then, removing the standard magnetic pulling force, checking the weight reading of the weighing hopper, and completing the weighing calibration.

[0014] The solution is further that: the weighing lever is axially provided with a long slide groove, the lever support is slidably arranged in the slide groove, and the sliding arrangement is used to change the support point of the lever support for the weighing lever, and the calibration weighing is changed by changing the support point according to the torque balance formula; the method further includes: changing the support point of the lever support at the lower end of the weighing lever, performing weighing calibration again, and realizing the linear calibration of the calibrated weighing hopper by calibrating different calibration weights.

[0015] The solution is further that: there are multiple standard magnetic pulls, and the multiple standard magnetic pulls are in a fixed relationship with multiple input current values. Different input current values ​​are changed to change different standard magnetic pulls. According to the torque balance formula, different standard magnetic pulls formed by changing different input current values ​​are used to change the calibration weighing. The method further includes: changing different input current values, weighing and calibrating again, and realizing linear calibration of the calibrated weighing hopper by changing different standard magnetic pulls formed by different input current values ​​for different calibration weighings.

[0016] The scheme is further as follows: the first lifting and adjusting mechanism includes a lever support base, a vertical hole is provided on the lever support base, a rotatable first adjusting nut is provided at the upper end of the vertical hole through a limiting groove, the lever support is screwed into the first adjusting nut through a thread, and the lifting and lowering of the lever support can be controlled by rotating the first adjusting nut; the second lifting and adjusting mechanism includes an adjustment base and a tension column extension rod serving as a tension column of the electromagnetic power meter, one end of the tension column extension rod is used to be connected to one end of the weighing lever, a vertical hole is provided on the adjustment base, a rotatable second adjusting nut is provided on the vertical hole through a limiting groove, the tension column extension rod is screwed into the second adjusting nut through a thread, and the lifting and lowering of the tension column extension rod can be controlled by rotating the second adjusting nut.

[0017] Compared with the prior art, the advantages of the present invention are as follows: the mass of the loading station can be calibrated without weights, which improves the efficiency of mass calibration of the loading station and eliminates the need for long-distance transportation of weighing weights for calibration; standard equipment can be connected and fixed to the weighing hopper, and calibration can be performed at any time, which improves the accuracy of mass calibration of the loading station and will not be subject to the uncertainty error caused by the wear and corrosion of the weights; online mass calibration of the loading station and mass correction of the weighing system are realized, and the weighing weights do not need to be replaced when stopping the vehicle for mass calibration, which not only improves the efficiency of mass calibration of the loading station, but also allows online analysis and permanent storage of calibration data, statistics of historical data, and thus fault diagnosis and analysis of the calibration instrument, and recording of actual data of each calibration process, which is more transparent and traceable compared to the weight calibration process. The automation and intelligence of mass calibration of the loading station are realized.

[0018] The present invention is described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the system structure of the present invention;

[0020] Figure 2 is a schematic diagram of the structure of the first lifting and lowering adjustment mechanism of the present invention, Figure 1 A magnified view of part A;

[0021] Figure 3 is a schematic diagram of the structure of the second lifting and lowering adjustment mechanism of the present invention, Figure 1 Enlarged view of part B. DETAILED DESCRIPTION

[0022] Embodiment 1:

[0023] A non-continuous cumulative weighing instrument large tonnage weightless calibration system, such as Figure 1 , Figure 2 and Figure 3 As shown, the system includes an electromagnetic power meter 1, a weighing lever 2, a lever support 3, a constant current source 4 and a controller 5. The electromagnetic power meter 1 and the lever support 3 are fixed on a platform 6. The lever support 3 supports the weighing lever 2 at the axial lower end of the weighing lever. An angle measuring device 7 is arranged on the upper end surface of the weighing lever. The angle measuring device 7 is used to measure the deflection angle of the weighing lever 2 with the lever support 3 as the support point. One end of the weighing lever 2 is rotatably connected and fixed to a tension column 101 extending from the electromagnetic power meter through a first axle pin 8, and the other end of the weighing lever 2 is rotatably connected and fixed to a connecting column 901 provided with a calibrated weighing hopper 9 through a second axle pin 10. The calibrated weighing hopper 9 is supported on a weight sensor 902. The constant current source 4 is connected to the electromagnetic power meter 1, and the electromagnetic power meter 1 and the angle measuring device 7 are connected to the controller 5.

[0024] This technical solution uses the principle of a steelyard, and uses the electromagnetic force generated by an electromagnetic power meter as the standard weight of the steelyard to calibrate a large tonnage of 1000 kg. The electromagnetic power meter is a well-known technology used. By supplying power to the electromagnetic power meter to enable it to work normally, a downward electromagnetic force is generated. According to the Planck constant, the downward force is converted into an electromagnetic force based on the mechanical force required to move an object with a mass of 1 kg. Different magnitudes of current can generate downward electromagnetic forces, and the mass corresponding to the electromagnetic force can be converted. That is: based on the Planck constant, an electromagnetic power meter with a fixed relationship between the standard magnetic pull and the input current value is formed by using a balance and a standard weight in the laboratory. The electromagnetic power meter of this embodiment is an electromagnetic power meter that has been compared with a ton-level weight. Electromagnetic force has been widely used in sports fitness training equipment. As this system, the lever support 3 is provided with a first lifting and adjusting mechanism, and the first lifting and adjusting mechanism is used for weighing lever level correction.

[0025] For the convenience of adjustment, in the embodiment, the tension column of the electromagnetic power meter is provided with a second lifting adjustment mechanism, and the first lifting adjustment mechanism and the second lifting adjustment mechanism are used together for the horizontal calibration of the weighing lever.

[0026] The electromagnetic power meter 1 in this embodiment is used as a standard and usually only generates a fixed standard magnetic pulling force. However, the weighing lever 2 is used. As long as the support point of the lever support 3 on the weighing lever 2 is changed, the calibration of different weighing can be achieved. That is, by adjusting the lever ratio, the mass ratio of the objects carried by the two ends of the weighing lever can be adjusted, so that a low-power electromagnetic power meter can be used to realize the weighing calibration of a large load mass. To this end: the weighing lever 2 is axially provided with a long slide groove 201, and the lever support 3 is slidably arranged in the slide groove 201. The sliding arrangement is used to change the support point of the lever support 3 on the weighing lever 2, and according to the moment balance formula (the moment balance formula of the product of the weight on both sides and the distance from the fulcrum), the calibration weighing is changed by changing the support point.

[0027] At the same time, there is another preferred scheme, in which there are multiple standard magnetic pulls, and the multiple standard magnetic pulls are in a fixed relationship with the multiple input current values. Different standard magnetic pulls are changed by changing different input current values, and the calibration weighing is changed by changing different standard magnetic pulls formed by changing different input current values ​​according to the torque balance formula.

[0028] In the embodiment, in order to facilitate intuitive positioning and adjustment: the weighing lever 2 is provided with a scale 202 along the long slide groove, and the scale is from the connection point with the tension column of the electromagnetic power meter as "0" to the distance from the connection column set with the calibrated weighing hopper. The required calibration weight can be quickly calculated through the scale.

[0029] like Figure 2 As shown, the first lifting adjustment mechanism includes a lever support base 301, a vertical hole 302 is provided on the lever support base 301, a rotatable first adjustment nut 304 is provided at the upper end of the vertical hole through a limiting notch 303, the lever support is screwed into the first adjustment nut 304 through a thread, and the first adjustment nut 304 can be rotated to control the lifting of the lever support 3. For precise adjustment, the threads on the first adjustment nut 304 and the lever support 3 are fine threads, and the lever support 3 is positioned in the slide groove 201 through a pin 305.

[0030] like Figure 3As shown: the second lifting adjustment mechanism includes an adjustment base as the tension column 101 of the electromagnetic power meter and a tension column extension rod 102, one end of the tension column extension rod 102 is used to connect with one end of the weighing lever 2 through the first shaft pin 8, a vertical hole 103 is provided on the adjustment base, and a rotatable second adjustment nut 105 is provided on the vertical hole 103 through a limiting notch 104, the tension column extension rod 102 is screwed into the second adjustment nut 105 through a thread, and the second adjustment nut 105 can be rotated to control the lifting and lowering of the tension column extension rod 102. For precise adjustment, the threads on the second adjustment nut 105 and the tension column extension rod 102 are also fine threads.

[0031] The above calibration structure can form a standard device which is connected and fixed to the weighing hopper, and the weighing calibration of the weighing hopper 9 can be performed at any time.

[0032] Embodiment 2:

[0033] A non-continuous cumulative weighing instrument large-tonnage weightless calibration method is a calibration method based on the weightless calibration system described in Example 1. Therefore, the content in Example 1 should be regarded as the content of this embodiment. One end of the weighing lever is rotatably connected and fixed to the connecting column 901 set to the calibrated weighing hopper 9 through a second shaft pin 10. The lever support 3 is provided with a first lifting adjustment mechanism, and the tension column 101 of the electromagnetic power meter 1 is provided with a second lifting adjustment mechanism. First, disconnect the tension column 101 of the electromagnetic power meter 1 from the weighing lever 2. Then, according to the torque relationship between the calibration weight and the standard magnetic pull of the electromagnetic power meter, determine the support point of the lever support on the weighing lever, and then perform zero point calibration and weighing calibration. For example, if you want to calibrate the weighing hopper 9 to 1000Kg, the standard magnetic pull of the electromagnetic power meter selected is 100Kg, the weighing lever selected should be 11m, and the support point of the lever support on the weighing lever should be 1m close to the side of the weighing hopper. In this way, according to the torque balance formula 100Kg×10m=1000Kg×1m;

[0034] The zero point calibration sequence is: empty the weighing hopper, adjust the weight display to "0", then support the lever support at the supporting point of the weighing lever, adjust the first lifting adjustment mechanism so that the reading value of the angle measuring device is "0", that is, the weighing lever is in a horizontal state; then, adjust the second lifting adjustment mechanism so that the tension column of the electromagnetic power meter is just connected and fixed to the other end of the weighing lever through the first shaft pin;

[0035] The weighing calibration is as follows: inputting a current of standard magnetic pulling force into the electromagnetic power meter to form a calibrated weight pulling force on the other end of the weighing lever, at which time the weighing lever tilts toward the electromagnetic power meter and loses its horizontal state; filling the weighing material into the weighing hopper, reading the degree value of the angle measuring device, when the degree value is "0", that is, the weighing lever is in a horizontal state, the weighing material filled in is the weight to be calibrated; then, removing the standard magnetic pulling force, checking the weight reading of the weighing hopper, and completing the weighing calibration.

[0036] As described in Example 1: the weighing lever is axially provided with a long slide groove, the lever support is slidably arranged in the slide groove, and the sliding arrangement is used to change the support point of the lever support for the weighing lever, and the calibration weighing is changed by changing the support point according to the torque balance formula; therefore, the method further includes: changing the support point of the lever support at the lower end of the weighing lever, performing weighing calibration again, and realizing linear calibration of the calibrated weighing hopper by calibrating different calibration weights, which is also an online calibration.

[0037] Also, as described in Example 1: there are multiple standard magnetic pulls, and the multiple standard magnetic pulls are in a fixed relationship with the multiple input current values. Different input current values ​​are changed to change different standard magnetic pulls. According to the torque balance formula, the calibration weighing is changed by changing different standard magnetic pulls formed by changing different input current values. Therefore, the method further includes: changing different input current values, weighing and calibrating again, and realizing linear calibration of the calibrated weighing hopper by changing different standard magnetic pulls formed by different input current values ​​for different calibration weighings.

[0038] Among them: the first lifting and adjusting mechanism includes a lever support base, a vertical hole is set on the lever support base, and a rotatable first adjusting nut is set at the upper end of the vertical hole through a limiting groove, the lever support is screwed into the first adjusting nut through a thread, and the lifting and lowering of the lever support can be controlled by rotating the first adjusting nut; the second lifting and adjusting mechanism includes an adjusting base and a tension column extension rod fixedly connected to the tension column of the electromagnetic power meter, one end of the tension column extension rod is used to be connected to one end of the weighing lever, a vertical through hole is set on the adjusting base, and a rotatable second adjusting nut is set on the vertical through hole through a limiting groove, the tension column extension rod is screwed into the second adjusting nut through a thread, and the lifting and lowering of the tension column extension rod can be controlled by rotating the second adjusting nut.

[0039] The above non-continuous cumulative weighing instrument large-tonnage weightless calibration system and method embodiment calculates the load mass of the weighing material through the output value of the electromagnetic power meter and the set lever ratio. Only when the weighing lever is measured to be in a balanced state by the angle measuring device, can the electromagnetic power meter calculate the load mass of the material corresponding to the lever ratio. The load mass of the weighing hopper calculated by the power meter is calibrated with the load mass of the weighing hopper calculated by the weighing sensor, and the system calibration of the load mass of the loading station hopper can be realized without weighing weights. It has realized the calibration of the mass of the loading station without weights, which has improved the efficiency of the mass calibration of the loading station and eliminated the need for long-distance transportation of weighing weights for calibration; it has improved the accuracy of the mass calibration of the loading station and will no longer be affected by the uncertainty errors caused by the wear and corrosion of the weights during the mass calibration; it has realized the online mass calibration of the loading station and the mass correction of the weighing system. During the mass calibration, there is no need to stop the vehicle to replace the weighing weights, which not only improves the efficiency of the mass calibration of the loading station, but also can analyze the calibration data online and preserve it permanently, make statistics on the historical data to diagnose the faults of the calibrator, and record the actual data of each calibration process. Compared with the calibration process with weights, it is more transparent and the calibration process is traceable, which can realize the automation and intelligence of the mass calibration of the loading station.

Claims

1. A non-continuous cumulative weighing instrument large tonnage weightless calibration method is based on a non-continuous cumulative weighing instrument large tonnage weightless calibration system, the system comprising: An electromagnetic power meter, a weighing lever, a lever support and a constant current source, wherein the electromagnetic power meter is fixed on a platform, the lever support supports the weighing lever at the axial lower end of the weighing lever, an angle measuring device is arranged on the upper end surface of the weighing lever, the angle measuring device is used to measure the deflection angle of the weighing lever with the lever support as the supporting point, one end of the weighing lever is rotatably connected and fixed to the tension column of the electromagnetic power meter through a first axle pin, the other end of the weighing lever is rotatably connected and fixed to the connecting column set with the calibrated weighing hopper through a second axle pin, and the constant current source is connected to the electromagnetic power meter; wherein: the electromagnetic power meter is an electromagnetic power meter formed by calibration with a fixed relationship between a standard magnetic pull and an input current value, the lever support is provided with a first lifting and lowering adjustment mechanism, and the first lifting and lowering adjustment mechanism is used for horizontal calibration of the weighing lever; One end of the weighing lever is rotatably connected and fixed to a connecting column provided with a calibrated weighing hopper through a second axle pin, and the tension column of the electromagnetic power meter is provided with a second lifting and lowering adjustment mechanism. First, the connection between the tension column of the electromagnetic power meter and the other end of the weighing lever is disconnected; it is characterized in that the supporting point of the lever support on the weighing lever is determined according to the torque relationship between the calibration weight and the standard magnetic tension of the electromagnetic power meter, and then zero point calibration and weighing calibration are performed; The zero point calibration sequence is: empty the weighing hopper, adjust the weight display to "0", then support the lever support at the supporting point of the weighing lever, adjust the first lifting adjustment mechanism so that the reading value of the angle measuring device is "0", that is, the weighing lever is in a horizontal state; then, adjust the second lifting adjustment mechanism so that the tension column of the electromagnetic power meter is just connected and fixed to the other end of the weighing lever through the first shaft pin; The weighing calibration is as follows: inputting a current of standard magnetic pulling force into the electromagnetic power meter to form a calibrated weight pulling force on the other end of the weighing lever, at which time the weighing lever tilts toward the electromagnetic power meter and loses its horizontal state; filling the weighing material into the weighing hopper, reading the degree value of the angle measuring device, when the degree value is "0", that is, the weighing lever is in a horizontal state, the weighing material filled in is the weight to be calibrated; then, removing the standard magnetic pulling force, checking the weight reading of the weighing hopper, and completing the weighing calibration.

2. The method according to claim 1, characterized in that The weighing lever is axially provided with a long slide groove, and the lever support is slidably arranged in the slide groove. The sliding arrangement is used to change the support point of the lever support on the weighing lever, and the calibration weighing is changed by changing the support point according to the torque balance formula; the method further includes: changing the support point of the lever support at the lower end of the weighing lever, performing weighing calibration again, and realizing linear calibration of the calibrated weighing hopper by calibrating different calibration weights.

3. The method according to claim 1, characterized in that There are multiple standard magnetic pulling forces, and the multiple standard magnetic pulling forces are in a fixed relationship with multiple input current values. Different input current values ​​are changed to change different standard magnetic pulling forces. According to the torque balance formula, different standard magnetic pulling forces formed by changing different input current values ​​are used to change the calibration weighing. The method further includes: changing different input current values, weighing and calibrating again, and realizing linear calibration of the calibrated weighing hopper by changing different standard magnetic pulling forces formed by different input current values ​​for different calibration weighings.

4. The method according to claim 1, characterized in that: The first lifting and adjusting mechanism includes a lever support base, a vertical hole is provided on the lever support base, a rotatable first adjusting nut is provided at the upper end of the vertical hole through a limiting groove, the lever support is screwed into the first adjusting nut through a thread, and the lifting and lowering of the lever support can be controlled by rotating the first adjusting nut; the second lifting and adjusting mechanism includes an adjusting base and a tension column extension rod fixedly connected to the tension column of the electromagnetic power meter, one end of the tension column extension rod is used to be connected to one end of the weighing lever, a vertical through hole is provided on the adjusting base, a rotatable second adjusting nut is provided on the vertical through hole through a limiting groove, the tension column extension rod is screwed into the second adjusting nut through a thread, and the lifting and lowering of the tension column extension rod can be controlled by rotating the second adjusting nut.

5. The method according to claim 1, characterized in that The second lifting and adjusting mechanism includes an adjusting base and a tension column extension rod serving as the tension column of the electromagnetic power meter. One end of the tension column extension rod is used to be connected to one end of the weighing lever. A vertical hole is arranged on the adjusting base. A rotatable second adjusting nut is arranged on the vertical hole through a limiting groove. The tension column extension rod is screwed into the second adjusting nut through a thread. Rotating the second adjusting nut can control the lifting and lowering of the tension column extension rod.

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