Pre-heat-free waiting electronic balance weighing method

Abstract

The application discloses a preheating-free waiting electronic balance weighing method, which comprises the following steps: collecting the real-time temperature of a permanent magnet in response to the start of an electronic balance; obtaining the real-time intrinsic magnetic field intensity of the permanent magnet with respect to a first coil at the real-time temperature; adjusting the current intensity flowing into a second coil according to the real-time intrinsic magnetic field intensity, so that the magnetic field intensity of the region where the first coil is located is maintained within a first preset magnetic field intensity range; issuing a magnetic field intensity adjustment completion reminder to enable a user to perform a first skin-removing zero operation on the electronic balance in response to the magnetic field intensity of the region where the first coil is located being within the first preset magnetic field intensity range; stopping the energization of the second coil and issuing a preheating completion reminder to enable the user to perform a second skin-removing zero operation on the electronic balance in response to the permanent magnet reaching a thermal equilibrium temperature; and weighing a to-be-measured object in response to the object being placed on a scale pan. The application can eliminate the preheating waiting time while ensuring the weighing accuracy.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electronic balance, in particular to a preheating-free waiting electronic balance weighing method. BACKGROUND

[0002] A balance is a weighing instrument, which measures the mass of an object. Previously, the balance was made according to the principle of the lever, and there was a small plate on each end of the lever, a weight was placed on one end, and an object to be weighed was placed on the other end, a pointer was installed in the center of the lever, and when the two ends were balanced, the masses (weights) of the two ends were equal. With the progress of science and technology, modern balances are more and more precise, more and more sensitive, and more and more various.

[0003] An electronic balance is a kind of precision balance with high precision and high sensitivity, and an electromagnetic balance electronic balance is a common instrument in modern laboratories. The electromagnetic balance electronic balance maintains the balance of the scale pan by keeping the electromagnetic force equal to the gravity of the object to be measured, and records the current in the coil proportional to the electromagnetic force, and obtains the weight of the object to be measured by measuring the current. The electromagnetic balance electronic balance has high precision, so it has high requirements for the weighing environment, and temperature, humidity, vibration, altitude and other reasons may affect the weighing structure. In particular, temperature changes will affect the change of the balance range and zero point, causing weighing data drift, instability and other situations. Only after sufficient preheating, the permanent magnet inside the balance reaches thermal equilibrium, and the electromagnetic intensity of the internal circuit tends to be stable, the balance can reach equilibrium. After sufficient preheating, through skinning and zeroing, calibration and other operations, accurate weighing can be achieved. The more precise the electronic balance, the longer the preheating time, which results in a long waiting time when using the electronic balance. How to reduce the waiting time of using the electronic balance and improve the use efficiency has become a problem to be solved. SUMMARY

[0004] In view of the above part of the defects of the prior art, the technical problem to be solved by the present application is to provide a preheating-free waiting electronic balance weighing method, which aims to reduce or even eliminate the preheating waiting time under the condition of ensuring the weighing accuracy, so that the electronic balance can be quickly used, thereby improving the use efficiency of the electronic balance.

[0005] In order to achieve the above object, the application discloses a preheating-free waiting electronic balance weighing method applied to an electromagnetic balance type electronic balance, which comprises a weighing pan, a support connecting rod, a weighing column, a beam rod and a coil holder, the coil holder is provided with a first coil, a permanent magnet below the coil holder is used to generate a first magnetic field, and a second coil on the outer side of the upper part of the permanent magnet is used to generate a second magnetic field by being electrified; the electronic balance further comprises a light barrier and a photosensitive tube circuit used to detect the displacement of the weighing pan, the photosensitive tube circuit is connected with a proportional-integral-derivative regulator, and the proportional-integral-derivative regulator is used to control the current input into the first coil; the method comprises the following steps:

[0006] Step S1, in response to the start of the electronic balance, the real-time temperature of the permanent magnet is collected, the magnetic field strength variation curve corresponding to the permanent magnet is obtained according to the real-time temperature and the temperature variation curve corresponding to the permanent magnet, and the real-time intrinsic magnetic field strength of the permanent magnet for the first coil at the real-time temperature is obtained according to the magnetic field strength variation curve obtained through pre-experiment and the real-time temperature.

[0007] Step S2, the current intensity input into the second coil is adjusted according to the real-time intrinsic magnetic field strength, so that the second magnetic field generated by the second coil and the first magnetic field generated by the permanent magnet are superimposed or offset, and the magnetic field strength of the area where the first coil is located is maintained within the first preset magnetic field strength range.

[0008] Step S3, in response to the magnetic field strength of the area where the first coil is located being within the first preset magnetic field strength range, a magnetic field strength adjustment completion reminder is sent to make the user perform a first peeling zero operation on the electronic balance; after the first peeling zero operation, the electronic balance works in a preheating-free waiting weighing mode and performs a weighing operation;

[0009] Step S4, in response to the permanent magnet reaching a thermal equilibrium temperature, the power supply to the second coil is stopped, and a preheating completion reminder is sent to make the user perform a second peeling zero operation on the electronic balance; after the second peeling zero operation, the electronic balance works in a preheated weighing mode and performs a weighing operation;

[0010] Step S5, after the step S3 or the step S4, in response to the placement of a to-be-measured object on the weighing pan of the electronic balance, the to-be-measured object is weighed to obtain the weight of the to-be-measured object.

[0011] Optionally, the step S2 comprises:

[0012] According to the magnetic field strength variation curve and the magnetic field direction of the first magnetic field, current is input to the second coil in a first current direction and the current intensity input to the second coil is adjusted, so that the second magnetic field generated by the second coil counteracts the first magnetic field generated by the permanent magnet to maintain the magnetic field strength of the area where the first coil is located within a first preset magnetic field strength range; wherein the first preset magnetic field strength range is set according to the magnetic field strength generated by the permanent magnet when the permanent magnet reaches thermal equilibrium.

[0013] Optionally, the method further comprises:

[0014] The environmental temperature corresponding to the electronic balance is collected; according to the environmental temperature, the thermal equilibrium temperature of the permanent magnet is obtained; according to the permanent magnet reaching the thermal equilibrium temperature, the corresponding magnetic field strength of the permanent magnet when reaching thermal equilibrium is obtained,

[0015] According to the corresponding magnetic field strength of the permanent magnet when reaching thermal equilibrium, the first preset magnetic field strength range is set.

[0016] Optionally, after the step S1, the method further comprises:

[0017] The temperature of the permanent magnet is collected in real time; wherein a temperature sensor for collecting the temperature of the permanent magnet is arranged beside the permanent magnet;

[0018] In response to the amplitude of the change of the temperature of the permanent magnet within a preset time length being less than a preset change amplitude, it is determined that the permanent magnet reaches thermal equilibrium.

[0019] Optionally, the step S2 comprises:

[0020] According to the magnetic field strength variation curve and the magnetic field direction of the first magnetic field, current is input to the second coil in a second current direction and the current intensity input to the second coil is adjusted, so that the second magnetic field generated by the second coil superimposes the first magnetic field generated by the permanent magnet to maintain the magnetic field strength of the area where the first coil is located within a first preset magnetic field strength range.

[0021] Optionally, the electronic balance further comprises a magnetometer, and the magnetometer is arranged directly above or below the permanent magnet, and the method further comprises:

[0022] In response to the electronic balance being turned on, the magnetometer is used to collect the real-time magnetic field strength in the electronic balance;

[0023] According to the real-time magnetic field intensity, the current intensity into the second coil is adjusted so that the second magnetic field generated by the second coil and the first magnetic field generated by the permanent magnet are superimposed or offset to maintain the magnetic field intensity of the area where the first coil is located within a first preset magnetic field intensity range.

[0024] Optionally, the method further comprises:

[0025] The ambient temperature corresponding to the electronic balance is collected; wherein, the outer wall of the electronic balance is provided with a thermal equilibrium temperature sensor for collecting the ambient temperature;

[0026] In response to the ambient temperature exceeding a threshold value, an alarm is issued to avoid demagnetization damage of the permanent magnet.

[0027] The beneficial effects of the present application are as follows: 1. The second coil is wound on the upper outer side of the permanent magnet to collect the real-time temperature of the permanent magnet, and the real-time intrinsic magnetic field strength of the permanent magnet to the first coil under the real-time temperature is obtained. According to the real-time intrinsic magnetic field strength, the current intensity flowing into the second coil is adjusted, so that the second magnetic field generated by the second coil and the first magnetic field generated by the permanent magnet are superimposed or offset, and the magnetic field strength of the region where the first coil is located is maintained within the first preset magnetic field strength range. The second magnetic field generated by the change of the magnetic field strength of the current in the second coil is used to offset the change of the magnetic field strength of the first magnetic field (caused by the change of temperature), so as to ensure the stability of the overall magnetic field strength of the region where the first coil is located, and then the electromagnetic force is no longer affected by the change of the magnetic field strength, so that the weighing result can be ensured to be accurate and stable. The present application can make the overall magnetic field strength of the region where the first coil is located stable for weighing without waiting for the preheating to end, effectively reducing or even eliminating the preheating waiting time, and improving the weighing efficiency of the electronic balance. 2. The present application can obtain the corresponding relationship (magnetic field strength change curve) between the temperature of the permanent magnet and the intrinsic magnetic field strength in advance, and then indirectly obtain the real-time intrinsic magnetic field strength according to the real-time temperature of the permanent magnet, and then realize the adjustment of the second magnetic field strength according to the temperature of the permanent magnet. Compared with introducing a new device to directly measure the magnetic field strength, the measurement of temperature is more convenient and will not affect the weighing result. 3. The present application stops the power supply to the second coil when the permanent magnet reaches the thermal equilibrium temperature, and sends a preheating completion reminder to make the user perform the second skinning zero operation on the electronic balance. After the preheating is completed, the temperature of the permanent magnet is basically stable and can generate a stable magnetic field, so that the external magnetic field intervention is not needed to make it stable. Therefore, the present application stops the power supply to the second coil and performs the second skinning zero operation again, which can effectively save energy. 4. The present application can change the direction of the current in the second coil, so that the first magnetic field and the second magnetic field offset each other to keep the magnetic field stable. Because the first magnetic field gradually decreases as the preheating temperature rises, when the offset magnetic field is used, the real-time intrinsic magnetic field strength of the permanent magnet reaching the thermal equilibrium temperature can be ensured to fall within the first preset magnetic field strength range, and the skinning zero operation is reduced. In summary, the present application introduces a new controllable variable magnetic field to offset the change of the original magnetic field strength, so as to realize the stability of the magnetic field when the preheating is not completed, ensure the stability and accuracy of the weighing result when the preheating is not completed, and thus eliminate the preheating waiting, and increase the weighing efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a flowchart of a preheating-free electronic balance weighing method provided by a specific embodiment of the present application;

[0029] Figure 2 is a structural schematic diagram of an electronic balance provided by a specific embodiment of the present application. DETAILED DESCRIPTION

[0030] The application discloses a preheating-free waiting electronic balance weighing method, and technical personnel in the field can learn from the content and improve technical details to realize the method. It is particularly pointed out that all similar substitutions and changes are obvious to technical personnel in the field and are regarded as being included in the application. The method and application of the application have been described through preferred embodiments, and relevant personnel can obviously change or appropriately change and combine the method and application described herein without departing from the content, spirit and scope of the application to realize and apply the technology of the application.

[0031] The application discloses a preheating-free waiting electronic balance weighing method, and technical personnel in the field can learn from the content and improve technical details to realize the method. It is particularly pointed out that all similar substitutions and changes are obvious to technical personnel in the field and are regarded as being included in the application. The method and application of the application have been described through preferred embodiments, and relevant personnel can obviously change or appropriately change and combine the method and application described herein without departing from the content, spirit and scope of the application to realize and apply the technology of the application.

[0032] Therefore, the application provides a preheating-free waiting electronic balance weighing method, which is applied to an electromagnetic balance electronic balance, and the electronic balance comprises a scale pan, the scale pan is connected with a coil holder through a support connecting rod, a weighing column and a beam rod, the coil holder is wound with a first coil, a permanent magnet for generating a first magnetic field is arranged below the coil holder, and a second coil for generating a second magnetic field by being electrified is wound on the outer side of the upper portion of the permanent magnet; the electronic balance further comprises a light barrier and a photosensitive tube circuit for detecting the displacement of the scale pan, the photosensitive tube circuit is connected with a proportional-integral-derivative regulator, and the proportional-integral-derivative regulator is used for controlling the current input into the first coil; and the method comprises the following steps.

[0033] S1: in response to the start of the electronic balance, the real-time temperature of the permanent magnet is collected; the magnetic field strength change curve corresponding to the permanent magnet is obtained according to the real-time temperature and the temperature change curve corresponding to the permanent magnet; and the real-time intrinsic magnetic field strength of the permanent magnet for the first coil at the real-time temperature is obtained according to the magnetic field strength change curve obtained through pre-experiment and the real-time temperature.

[0034] It should be noted that the temperature change curve is a curve of real-time temperature change, and the magnetic field strength change curve is a curve relationship diagram of the temperature of the permanent magnet and the intrinsic magnetic field strength (that is, when the temperature of the permanent magnet is how much, the corresponding intrinsic magnetic field strength is how much). The intrinsic magnetic field strength is indirectly obtained through temperature measurement, so that the influence of a magnetometer (an instrument for measuring the magnetic field strength) on the weighing result can be avoided. Meanwhile, the temperature measurement by using a temperature sensor is simpler and more convenient than the magnetometer.

[0035] In a specific embodiment, a temperature sensor is arranged on the side of the permanent magnet, and is used for collecting the temperature of the permanent magnet in real time.

[0036] In a specific embodiment, the structure of the electronic balance can be as shown in the figure Figure 2 201 is a weighing pan, 202 is a support connecting rod, 203 is a weighing column, 204 is a beam rod, 205 is a coil holder, 206 is a first coil, 207 is a permanent magnet, 208 is a second coil, 209 is a photoelectric displacement detection mechanism for checking the displacement of the weighing pan, 210 is an adjusting mechanism, 211 is a base, 212 is a light shielding baffle, and 213 is a bottom corner bolt. Due to the structure of the electronic balance, some components of the electronic balance are not labeled or not shown in the figure.

[0037] Step S2, according to the real-time intrinsic magnetic field strength, adjust the current intensity into the second coil, so that the second magnetic field generated by the second coil and the first magnetic field generated by the permanent magnet superimposed or offset the magnetic field strength of the area where the first coil is maintained within the first preset magnetic field strength range.

[0038] It should be noted that after the electronic balance is started, the permanent magnet is in a preheating state, the temperature gradually rises, and the magnetic field generated by the permanent magnet decreases in strength due to the temperature rise. However, the electromagnetic force is proportional to the magnetic field strength and the current in the first coil, and the weighing in the electronic balance depends on the electromagnetic force equal to the weight, and the principle of measuring the current in the first coil to obtain the weight, at this time the magnetic field strength also becomes a variable that causes the weighing reading to be unstable, thereby making the weighing result inaccurate. Therefore, the embodiment of the application increases the energized coil on the permanent magnet to generate a controllable intensity magnetic field that superimposes or offsets the magnetic field of the permanent magnet, so that the magnetic field strength of the area where the first coil is stable. Accordingly, the magnetic field strength remains unchanged for accurate weighing, reduces or eliminates preheating waiting time, and improves weighing efficiency.

[0039] Optionally, step S2 includes:

[0040] According to the magnetic field strength change curve and the magnetic field direction of the first magnetic field, the current is input into the second coil in the first current direction and the current intensity into the second coil is adjusted, so that the second magnetic field generated by the second coil and the first magnetic field generated by the permanent magnet are offset to maintain the magnetic field strength of the area where the first coil is within the first preset magnetic field strength range; wherein the first preset magnetic field strength range is set according to the magnetic field strength generated by the permanent magnet when it reaches thermal equilibrium.

[0041] It should be noted that during the preheating process of the electronic balance, the magnetic field strength generated by the permanent magnet gradually weakens, and the magnetic field strength after preheating is smaller than that before preheating. The embodiment makes the first magnetic field and the second magnetic field offset each other to keep the magnetic field stable, and sets the first preset magnetic field strength range according to the magnetic field strength generated by the permanent magnet in thermal equilibrium, which can ensure that the magnetic field strength of the region where the first coil is located is always maintained within the first preset magnetic field strength range before and after preheating. It can increase the weighing stability, and at the same time, the embodiment can also not need to perform the second weighing skinning operation, reduce the operation process, and be more convenient for users.

[0042] Further, the method further comprises:

[0043] The environment temperature corresponding to the electronic balance is collected; the thermal equilibrium temperature of the permanent magnet is obtained according to the environment temperature; the magnetic field strength corresponding to the permanent magnet when reaching thermal equilibrium is obtained according to the permanent magnet reaching the thermal equilibrium temperature; and the first preset magnetic field strength range is set according to the magnetic field strength corresponding to the permanent magnet when reaching thermal equilibrium.

[0044] It should be noted that the thermal equilibrium temperature of the permanent magnet is related to the external environment temperature, and the thermal equilibrium temperature of the permanent magnet can be obtained by obtaining the external environment temperature.

[0045] Optionally, step S2 comprises:

[0046] According to the magnetic field strength change curve and the magnetic field direction of the first magnetic field, the current is input to the second coil in the second current direction and the current intensity input to the second coil is adjusted, so that the second magnetic field generated by the second coil and the first magnetic field generated by the permanent magnet are superimposed to maintain the magnetic field strength of the region where the first coil is located within the first preset magnetic field strength range.

[0047] It should be noted that the method of superimposing two magnetic fields can also maintain the stability of the magnetic field.

[0048] Step S3, in response to the magnetic field strength of the region where the first coil is located being within the first preset magnetic field strength range, a magnetic field strength adjustment completion reminder is issued to enable the user to perform a first skinning zero operation on the electronic balance; after the first skinning zero operation, the electronic balance works in a preheating-free waiting weighing mode and performs a weighing operation.

[0049] It should be noted that when the magnetic field strength of the region where the first coil is located is within the first preset magnetic field strength range, it means that the magnetic field strength of the region where the first coil is located has been stabilized. At this time, the weighing result is already relatively accurate and does not need to be preheated and waited.

[0050] Step S4, in response to the permanent magnet reaching the thermal equilibrium temperature, stop energizing the second coil and issue a preheating completion reminder to make the user perform a second skinning zero operation on the electronic balance; after the second skinning zero operation, the electronic balance works in the preheated weighing mode and performs a weighing operation.

[0051] It should be noted that after the permanent magnet reaches the thermal equilibrium temperature, the magnetic field itself is stable, and stopping energizing the second coil can reduce energy waste.

[0052] Step S5, after step S3 or step S4, in response to the placement of the measured object on the scale pan of the electronic balance, the measured object is weighed to obtain the weight of the measured object.

[0053] In a specific embodiment, after step S1, the method further comprises:

[0054] Real-time acquisition of the temperature of the permanent magnet; wherein a temperature sensor for acquiring the temperature of the permanent magnet is arranged beside the permanent magnet;

[0055] In response to the fact that the amplitude of the change in the temperature of the permanent magnet within a preset time length is less than a preset change amplitude, it is determined that the permanent magnet has reached thermal equilibrium.

[0056] It should be noted that the thermal equilibrium temperature may fluctuate slightly due to external reasons, and therefore the range amplitude of this embodiment can effectively reduce false judgments.

[0057] Optionally, the electronic balance further comprises a magnetometer, and the magnetometer is arranged directly above or below the permanent magnet, and the method further comprises:

[0058] In response to the start of the electronic balance, the magnetometer is used to acquire the real-time magnetic field strength in the electronic balance;

[0059] According to the real-time magnetic field strength, the current intensity supplied to the second coil is adjusted, so that the second magnetic field generated by the second coil and the first magnetic field generated by the permanent magnet are superimposed or offset, and the magnetic field strength of the region where the first coil is located is maintained within the first preset magnetic field strength range.

[0060] It should be noted that the embodiment of the present application can also directly measure the magnetic field strength by using the magnetometer.

[0061] In a specific embodiment, the method further comprises:

[0062] Acquisition of the ambient temperature corresponding to the electronic balance; wherein a thermal equilibrium temperature sensor for acquiring the ambient temperature is arranged on the outer wall of the electronic balance;

[0063] In response to the fact that the ambient temperature exceeds a threshold value, an alarm reminder is issued to avoid demagnetization damage to the permanent magnet.

[0064] It should be noted that if the ambient temperature is too high, the permanent magnet will be permanently demagnetized, causing damage, therefore, the embodiment of the present application avoids the occurrence of this situation through temperature detection.

[0065] The second coil is wound on the upper outer side of the permanent magnet to collect the real-time temperature of the permanent magnet, and then the real-time intrinsic magnetic field strength of the permanent magnet for the first coil under the real-time temperature is obtained; according to the real-time intrinsic magnetic field strength, the current intensity flowing into the second coil is adjusted, so that the second magnetic field generated by the second coil and the first magnetic field generated by the permanent magnet are superimposed or offset, and the magnetic field strength of the region where the first coil is located is maintained within the first preset magnetic field strength range. The embodiment of the present application adjusts the second magnetic field generated by the change of the magnetic field strength of the current in the second coil to offset the change of the magnetic field strength of the first magnetic field caused by the temperature change, so as to ensure the stability of the overall magnetic field strength of the region where the first coil is located, and then the electromagnetic force is no longer affected by the change of the magnetic field strength, so that the weighing result can be ensured to be accurate and stable. The embodiment of the present application can make the overall magnetic field strength of the region where the first coil is located stable for weighing without waiting for the preheating to end, effectively reducing or even eliminating the preheating waiting time, and improving the weighing efficiency of the electronic balance.

[0066] The embodiment of the present application can obtain the corresponding relationship (magnetic field strength change curve) between the temperature of the permanent magnet and the intrinsic magnetic field strength in advance, and then indirectly obtain the real-time intrinsic magnetic field strength according to the real-time temperature of the permanent magnet, and then realize the adjustment of the second magnetic field strength according to the temperature of the permanent magnet. Compared with introducing a new device to directly measure the magnetic field strength, the temperature is more convenient to measure and will not affect the weighing result.

[0067] The embodiment of the present application stops energizing the second coil and sends a preheating completion reminder when the permanent magnet reaches the thermal equilibrium temperature, so that the user performs the second skinning zero operation on the electronic balance. After the preheating is completed, the temperature of the permanent magnet is basically stable and can generate a stable magnetic field, so that external magnetic field intervention is not needed to make it stable. Therefore, the embodiment of the present application stops energizing the second coil and re-performs the second skinning zero operation, which can effectively save energy.

[0068] The embodiment of the present application can change the current direction in the second coil, so that the first magnetic field and the second magnetic field offset each other to keep the magnetic field stable. Because the first magnetic field gradually decreases as the preheating temperature rises, when the offset magnetic field is used, the real-time intrinsic magnetic field strength of the permanent magnet reaching the thermal equilibrium temperature can be ensured to fall within the first preset magnetic field strength range, and the skinning zero operation is reduced.

[0069] In summary, the embodiment of the present application introduces a new controllable variable magnetic field to offset the change of the original magnetic field strength, so as to realize the stability of the magnetic field before the preheating is completed, ensure the stability and accuracy of the weighing result during the preheating, and thus eliminate the preheating waiting time and increase the weighing efficiency.

[0070] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0071] Each embodiment in this specification is described in a related manner. Similar parts between the various embodiments can be referred to in conjunction with each other. Each embodiment focuses on the differences between the other embodiments. In particular, the system embodiment is generally similar to the method embodiment, so the description is relatively simple. For related parts, refer to the description of the method embodiment.

[0072] The above are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention are included in the scope of protection of the present invention.

Claims

1. A pre-heat wait-free electronic balance weighing method, characterized by, The application is applied to an electromagnetic balance electronic balance, which comprises a balance pan, a support link, a weighing column, a beam rod and a coil holder, the coil holder is provided with a first coil, a permanent magnet below the coil holder is used to generate a first magnetic field, the upper outer side of the permanent magnet is provided with a second coil used to generate a second magnetic field by electrification, the electronic balance further comprises a light barrier and a photosensitive tube circuit used to detect the displacement of the balance pan, the photosensitive tube circuit is connected with a proportional integral derivative regulator, the proportional integral derivative regulator is used to control the current input into the first coil, and the method comprises the following steps: Step S1, in response to the start of the electronic balance, the real-time temperature of the permanent magnet is collected, the magnetic field strength variation curve corresponding to the permanent magnet is obtained according to the real-time temperature and the temperature variation curve corresponding to the permanent magnet, and the real-time intrinsic magnetic field strength of the permanent magnet for the first coil at the real-time temperature is obtained according to the magnetic field strength variation curve obtained through pre-experiment and the real-time temperature; Step S2, the current intensity input into the second coil is adjusted according to the real-time intrinsic magnetic field strength, so that the second magnetic field generated by the second coil and the first magnetic field generated by the permanent magnet are superimposed or offset, and the magnetic field strength of the area where the first coil is located is maintained within the first preset magnetic field strength range; Step S3, in response to the magnetic field strength of the area where the first coil is located being within the first preset magnetic field strength range, a magnetic field strength adjustment completion reminder is sent to make the user perform a first peeling zero operation on the electronic balance, and after the first peeling zero operation, the electronic balance works in a preheating-free waiting weighing mode and performs a weighing operation; Step S4, in response to the permanent magnet reaching a thermal equilibrium temperature, the electrification of the second coil is stopped, and a preheating completion reminder is sent to make the user perform a second peeling zero operation on the electronic balance, and after the second peeling zero operation, the electronic balance works in a preheated weighing mode and performs a weighing operation; Step S5, after step S4, in response to the placement of a to-be-measured object on the balance pan of the electronic balance, the to-be-measured object is weighed to obtain the weight of the to-be-measured object; In step S2, the current is input into the second coil in a first current direction according to the magnetic field strength variation curve and the magnetic field direction of the first magnetic field, and the current intensity input into the second coil is adjusted, so that the second magnetic field generated by the second coil and the first magnetic field generated by the permanent magnet are offset, and the magnetic field strength of the area where the first coil is located is maintained within the first preset magnetic field strength range, and the first preset magnetic field strength range is set according to the magnetic field strength generated by the permanent magnet when the permanent magnet reaches thermal equilibrium. The method further comprises: collecting an ambient temperature corresponding to the electronic balance; obtaining the thermal equilibrium temperature of the permanent magnet according to the ambient temperature; obtaining the magnetic field strength corresponding to the permanent magnet when the permanent magnet reaches thermal equilibrium according to the permanent magnet reaching the thermal equilibrium temperature; and setting the first preset magnetic field strength range according to the magnetic field strength corresponding to the permanent magnet when the permanent magnet reaches thermal equilibrium.

2. The pre-heat waiting-free electronic balance weighing method according to claim 1, characterized in that, After the step S1, the method further comprises: collecting the temperature of the permanent magnet in real time; wherein a temperature sensor for collecting the temperature of the permanent magnet is arranged beside the permanent magnet; determining that the permanent magnet reaches thermal equilibrium in response to the amplitude of the change in the temperature of the permanent magnet within a preset time length being less than a preset change amplitude.

3. The pre-heatless waiting electronic balance weighing method according to claim 1, characterized in that, The step S2 comprises: According to the magnetic field strength change curve and the magnetic field direction of the first magnetic field, the current direction of the second coil is adjusted to the second current direction, and the current intensity flowing into the second coil is adjusted, so that the second magnetic field generated by the second coil and the first magnetic field generated by the permanent magnet are superimposed to maintain the magnetic field strength of the area where the first coil is located within the first preset magnetic field strength range.

4. The pre-heatless waiting electronic balance weighing method according to claim 1, characterized in that, The electronic balance further comprises a magnetometer arranged directly above or below the permanent magnet, and the method further comprises: collecting the real-time magnetic field strength in the electronic balance by using the magnetometer in response to the electronic balance being turned on; adjusting the current intensity flowing into the second coil according to the real-time magnetic field strength, so that the second magnetic field generated by the second coil and the first magnetic field generated by the permanent magnet are superimposed or cancelled to maintain the magnetic field strength of the area where the first coil is located within the first preset magnetic field strength range.

5. The pre-heatless waiting electronic balance weighing method according to claim 1, wherein, The method further comprises: collecting an ambient temperature corresponding to the electronic balance; wherein the outer wall of the electronic balance is provided with a thermal equilibrium temperature sensor for collecting the ambient temperature; issuing an alarm reminder in response to the ambient temperature exceeding a threshold value to avoid demagnetization damage to the permanent magnet.

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