Improved structure of electromagnetic force balancing device for electronic balance

Abstract

The utility model belongs to the technical field of electronic balances, and particularly relates to an improved structure of an electromagnetic force balancing device for an electronic balance, which comprises a stand column assembly vertically arranged in the electromagnetic force balancing device, the stand column assembly comprises an outer column body and an inner column body fixedly arranged in the outer column body, and a damping ring is sleeved outside the outer column body. A plurality of stress buffering grooves are vertically formed in the surface of the outer column body. According to the utility model, the durability of the permanent magnet is improved, the possibility of demagnetization of the permanent magnet is greatly reduced, the influence of uncertainty in the measurement process of the electronic balance is further reduced, and the accuracy and reliability of the measurement result are ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of electronic balances, and particularly relates to an improved structure of an electromagnetic force balancing device for an electronic balance. Background Art

[0002] Electronic balances are high-precision weighing instruments used across multiple disciplines, including mechanics, materials, electronic circuits, information processing, and precision manufacturing. With the advancement of science and technology and the rise of industrialization, the demand for electronic balances has increased significantly, particularly in key areas such as measurement transfer, food safety, biomedicine, and chemical analysis.

[0003] The operating principle of an electronic balance is primarily based on electromagnetic force compensation, achieving force or torque balance through electronic devices. Specifically, an electronic balance measures the weight of an object by using the electromagnetic force, or Ampere force, generated by a current-carrying wire in a magnetic field. When an object is placed on the scale pan, its gravity exerts a force on the coil, causing it to move. A displacement sensor detects this displacement and sends a signal. A regulator and amplifier then adjust the current in the coil until the sensor returns to its center position. At this point, the current intensity is proportional to the object's mass, thereby achieving weighing.

[0004] However, when an electronic balance is used repeatedly, the friction between the column and the permanent magnet can cause the permanent magnet to demagnetize. This can degrade the performance of the balance's magnetic sensor, leading to unstable readings, fluctuations, or drift, and thus affecting the reliability of measurement results. Therefore, measurement uncertainty in an electronic balance is a key factor affecting the accuracy and reliability of measurement results and requires scientific evaluation and control. Furthermore, extensive research data indicates that poor thermal conductivity of the column can also cause permanent magnet demagnetization.

[0005] Therefore, improvements are urgently needed. Utility Model Content

[0006] In response to the above-mentioned defects in the prior art, the present invention provides an improved structure of an electromagnetic force balancing device for an electronic balance, including a column assembly vertically arranged in the electromagnetic force balancing device. The electromagnetic force balancing device adopts the prior art, such as the disclosed invention patent with publication number CN102768060B, which discloses an electromagnetic force balance sensor in a high-precision multifunctional electronic balance, including a column, a permanent magnet, a tension spring, a coil and a light shielding sheet. The column assembly is analogous to a column, the column is connected to the bottom of the weighing pan, the column vertically passes through the permanent magnet and the bottom is connected to the light shielding sheet, the coil is installed at the bottom of the permanent magnet, the coil is connected to the permanent magnet through a tension spring, and the coil is connected to the PID adjustment circuit through a wire. The PID adjustment circuit is connected to the photoelectric detection circuit through a wire. The photoelectric detection circuit has a photosensitive tube. The coil is connected to the signal conditioning circuit through a wire. The signal conditioning circuit is connected to the data acquisition circuit through a wire. The data acquisition circuit is connected to the microprocessor system through a wire. The microprocessor system is used to perform digital filtering, drift compensation, and linear processing on the collected weighing data, and then output and display it; this case improves the structure of the column, that is, the column assembly, including an outer column and an inner column fixed inside the outer column. The outer side of the outer column is provided with a damping ring, and a number of stress buffer grooves are vertically arranged on the surface of the outer column. This stress release structure can not only reduce mechanical stress, but also improve heat conduction efficiency.

[0007] Optionally, the damping ring is a rubber damping ring.

[0008] Specifically, the rubber damping ring mainly covers the outside of the outer column part located between the bottom of the scale plate and the top of the permanent magnet. It can not only reduce the impact of temperature changes, vibration and impact of the column assembly on the permanent magnet, but also reduce the sound radiation caused by mechanical vibration and reduce mechanical noise, thereby ensuring the stability and measurement precision of the electronic balance.

[0009] Optionally, a number of heat dissipation hole groups equal to the number of stress buffer grooves are vertically arranged on the surface of the inner cylinder, and the positions of the heat dissipation hole groups correspond to the positions of the stress buffer grooves respectively, and each heat dissipation hole group includes multiple heat dissipation holes.

[0010] Specifically, this porous structure not only increases the surface area of ​​the column assembly, but also helps to improve the heat conduction efficiency.

[0011] The present invention also includes other components that enable the improved structure of the electromagnetic force balancing device for an electronic balance to function normally, which are all conventional technical means in the art. In addition, devices or components not limited in the present invention all adopt conventional technical means in the art.

[0012] The working principle and beneficial effects of the present invention are as follows: during measurement, before the scale pan of the electronic balance is loaded, the electromagnetic force balancing device is in an initial equilibrium state; after the scale pan is loaded, the gravity of the object being weighed causes the column assembly of the electromagnetic force balancing device to move downward, thereby displacing the light shielding plate and causing the photosensitive diode to sense the light emitted by the light-emitting tube. The specific detection principle can be found in the working principle of the published patent document "A High-Precision Multifunctional Electronic Balance" and will not be repeated here; during the downward movement of the column assembly, it will collide with the permanent magnet, and the rubber damping ring can provide a buffer between the two, protecting the permanent magnet and reducing damage caused by the collision. It can also reduce the acoustic radiation generated by temperature changes and mechanical vibrations, thereby reducing mechanical noise; the stress buffer groove provided on the outer column can not only reduce mechanical stress but also improve heat conduction efficiency; the heat dissipation holes provided on the inner column can not only increase the surface area of ​​the column assembly but also help improve heat conduction efficiency. In this way, the above multiple improvement measures can slow down the occurrence of permanent magnet demagnetization, ensuring the stability and measurement precision of the electronic balance. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0015] Figure 2 This is a schematic structural diagram of the column assembly in an embodiment of the present utility model after the rubber damping ring is removed.

[0016] Figure 3 This is a schematic structural diagram of the inner cylinder in an embodiment of the present utility model.

[0017] In the figure: 1. Outer cylinder, 2. Inner cylinder, 3. Rubber damping ring, 4. Stress buffer groove, 5. Heat dissipation hole. DETAILED DESCRIPTION

[0018] The present invention is described below in conjunction with the accompanying drawings and specific embodiments of the present invention. The description herein is intended only to explain the present invention and is not intended to limit the present invention. Based on the embodiments of the present invention, any modifications, equivalent substitutions, improvements, etc. made by those skilled in the art without creative work to all other embodiments obtained based on the embodiments of the present invention shall be included within the scope of protection of the present invention.

[0019] Example

[0020] like Figure 1-3As shown, an embodiment of the utility model provides an improved structure of an electromagnetic force balancing device for an electronic balance, including a column assembly vertically arranged in the electromagnetic force balancing device, the column assembly including an outer column 1 and an inner column 2 fixedly arranged inside the outer column 1, the outer portion of the outer column 1 is sleeved with a rubber damping ring 3, and a plurality of stress buffer grooves 4 are vertically arranged on the surface of the outer column 1. This stress release structure can not only reduce mechanical stress, but also improve heat conduction efficiency; a plurality of heat dissipation hole groups with the same number as the stress buffer grooves 4 are vertically arranged on the surface of the inner column 2, and the positions of the plurality of heat dissipation hole groups respectively correspond to the positions of the plurality of stress buffer grooves 4, and each heat dissipation hole group includes a plurality of heat dissipation holes 5. This porous structure can not only increase the surface area of ​​the column assembly, but also help to improve heat conduction efficiency.

[0021] In addition, the rubber damping ring 3 mainly covers the outside of the outer column 1 located between the bottom of the scale plate and the top of the permanent magnet. It can not only reduce the impact of temperature changes, vibration and impact of the column assembly on the permanent magnet, but also reduce the sound radiation caused by mechanical vibration and reduce mechanical noise, thereby ensuring the stability and measurement accuracy of the electronic balance.

[0022] The working principle and beneficial effects of the present invention are as follows: during measurement, before the scale pan of the electronic balance is loaded, the electromagnetic force balancing device is in an initial equilibrium state; after the scale pan is loaded, the gravity of the object being weighed causes the column assembly of the electromagnetic force balancing device to move downward, and in the process of the column assembly moving downward, it will collide with the permanent magnet, and the rubber damping ring 3 can provide a buffer between the two, protect the permanent magnet, reduce the damage caused by the collision, and also reduce the sound radiation caused by temperature changes and mechanical vibrations, and reduce mechanical noise; and the stress buffer groove 4 provided on the outer column 1 can not only reduce mechanical stress, but also improve heat conduction efficiency; the heat dissipation holes 5 provided on the inner column 2 can not only increase the surface area of ​​the column assembly, but also help to improve heat conduction efficiency. In this way, the above multiple improvement measures can slow down the occurrence of permanent magnet demagnetization and ensure the stability of the electronic balance and measurement precision.

[0023] By comparing the electronic balance before and after the improvement, the following table is obtained:

[0024] plan Electronic balance before improvement Improved electronic balance Indication error ≥0.000410mg <0.000410mg Standard uncertainty of reference mass ≥0.00220mg <0.00220mg Combined standard uncertainty ≥0.05mg <0.05mg Combined standard uncertainty ≥0.10mg <0.10mg

[0025] In summary, it can be seen that the uncertainty of the measurement process of the improved electronic balance is lower than that of the electronic balance before the improvement, and the accuracy and reliability of the measurement results are higher.

[0026] While the embodiments of the present invention have been described above, the above description is intended to be illustrative, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. An improved structure of an electromagnetic force balancing device for an electronic balance, comprising a column assembly vertically arranged in the electromagnetic force balancing device, characterized in that: The column assembly comprises an outer column and an inner column fixedly arranged inside the outer column. A damping ring is sleeved on the outer surface of the outer column, and a plurality of stress buffer grooves are vertically arranged on the surface of the outer column.

2. The improved structure of the electromagnetic force balancing device for an electronic balance according to claim 1, characterized in that: The damping ring adopts a rubber damping ring.

3. The improved structure of the electromagnetic force balancing device for an electronic balance according to claim 2, characterized in that: A number of heat dissipation hole groups having the same number as the stress buffer grooves are vertically arranged on the surface of the inner column, and the positions of the heat dissipation hole groups respectively correspond to the positions of the stress buffer grooves, and each heat dissipation hole group includes multiple heat dissipation holes.

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