Resistance measuring device

Abstract

The utility model particularly relates to a resistance measuring device, which is used for detecting the relative resistance value of a ceramic abrasive material and is characterized by comprising an insulation resistance meter and a detection mechanism, the detection mechanism comprises a large metal cylinder and a small metal cylinder, the cross sections of the large metal cylinder and the small metal cylinder are circular, and the two metal cylinders are concentrically arranged on an insulation substrate. An annular space between the two metal cylinders is a discharging cavity, two binding posts are installed on the insulation substrate, the first binding post is connected with the outer metal cylinder through a conductive block, the second binding post is connected with the inner metal cylinder through a conductive block, and two terminals of the insulation resistance meter are connected with the two binding posts through wires respectively. The device has the advantages of simple structure, low manufacturing cost, flexibility and convenience in use and high detection efficiency.

Description

TECHNICAL FIELD

[0001] The utility model relates to a resistance measuring device which is used for detecting the relative resistance value of ceramic abrasives. BACKGROUND

[0002] With the continuous development of science and technology, the coverage of electrostatic sanding technology in the coated abrasive industry is also expanding. The principle of electrostatic sanding is to use high-voltage electrostatic field and rely on the electrical properties of the abrasive to make the abrasive become a charged body and be adsorbed on the substrate coated with a binder, forming a sand belt with excellent grinding performance.

[0003] The sand particles of electrostatic sanding are adsorbed by electrostatic field force, so the electrical conductivity of the abrasive will affect the effect of electrostatic sanding. The electrical resistance of ceramic abrasives is relatively high, and its resistance value is relatively stable. There are some powder-specific resistivity measuring instruments on the market, but they either require special sample preparation equipment or use pressure adjustment for measurement. The ceramic abrasive particles are hard, and the pressure will cause the sample preparation container to wear out, reducing the service life of the sample preparation container and requiring frequent replacement. Therefore, the existing powder-specific resistivity measuring instruments are not suitable for detecting the resistance value of ceramic abrasives. SUMMARY

[0004] The utility model aims at providing a resistance measuring device which uses an insulation resistance meter and a simple detection mechanism to quickly detect the relative resistance of ceramic abrasives and improve work efficiency.

[0005] The utility model is achieved by the following technical solutions:

[0006] That is, a resistance measuring device, characterized in that it comprises an insulation resistance meter and a detection mechanism. The detection mechanism comprises two metal cylinders with circular cross sections, which are concentrically installed on an insulating base plate. The annular space between the two metal cylinders is a material discharge cavity. Two terminal posts are installed on the insulating base plate. The first terminal post is connected to the outer metal cylinder through a conductive block, and the second terminal post is connected to the inner metal cylinder through a conductive block. The two end buttons of the insulation resistance meter are connected to the two terminal posts through wires.

[0007] Further, the insulating base plate of the utility model is a wooden board or a plastic board.

[0008] Further, the two metal cylinders of the utility model are stainless steel cylinders.

[0009] The insulation resistance meter (commonly known as a swing meter) of the utility model is a mature commercially available product, and its use method is a conventional technical means for those skilled in the art.

[0010] The utility model discloses a relative resistance of ceramic abrasive is detected, and the electrostatic sanding effect of the customer of the coated abrasive is improved by using different processes according to the detection result.

[0011] The working principle of the utility model is as follows:

[0012] When the ceramic abrasive is not placed in the discharging cavity, it is empty resistance, and the pointer on the insulation resistance meter points to infinity (usually not due to environmental influence) in theory (when the handle is shaken) ; when the ceramic abrasive is filled in the discharging cavity, the index value of the pointer on the insulation resistance meter (when the handle is shaken) is the relative resistance value of the filled ceramic abrasive.

[0013] The measured relative resistance value is not the actual resistance value of the ceramic abrasive itself, but the value on the insulation resistance meter containing environmental influence factors.

[0014] When the electrostatic field force of the electrostatic sanding acts on the ceramic abrasive particles, there is a certain success probability, and the sanding success cannot be 100%, and through the experiment, it can be known that the ceramic abrasive with low relative resistance value has better sanding effect, the ceramic abrasive itself is a high resistance product, and the production environment and the detection environment greatly influence the resistance detection result, therefore, only by detecting the relative resistance value of the ceramic abrasive, the batch with too large resistance value (≥ 500MΩ) can be screened out, and then the relative resistance value is reduced, and the sanding effect can be improved.

[0015] That is to say, from the cost and efficacy, the resistance detection of the ceramic abrasive does not need accurate value, and only the relative value size is known.

[0016] In order to make the measurement result as accurate as possible, the ceramic abrasive in the discharging cavity needs to be vibrated (manual vibration or ultrasonic vibration).

[0017] The utility model discloses a detection of the relative resistance of ceramic abrasive, and adds a controllable index analysis to the ceramic abrasive, which has the advantages of simple structure, low manufacturing cost, flexible and convenient use, high detection efficiency. DRAWINGS

[0018] Figure 1 It is the structural schematic diagram of the utility model;

[0019] Figure 2 It is the top view structural schematic diagram of the detection mechanism of the utility model.

[0020] As shown in the figure: 1. insulation resistance meter;2. insulation substrate;3 second terminal post;4. outer metal cylinder;5. inner metal cylinder;6. discharging cavity;7. first terminal post;8. conductive block. CONCRETE IMPLEMENTATION

[0021] The embodiments of the technical scheme of the utility model will be described below in detail with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical scheme of the utility model, and therefore only serve as examples, and cannot limit the protection scope of the utility model. It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the present application should be the usual meanings understood by the technical personnel in the field to which the utility model belongs.

[0022] As shown in Figure 1 , Figure 2 The outer metal cylinder 4 and the inner metal cylinder 5 are concentrically installed on the insulating base plate 2 (wood board), and the annular space between the two metal cylinders is the discharging cavity 6. Two terminal posts are installed on the insulating base plate 2, the first terminal post 7 is connected with the outer metal cylinder 4 through the conductive block 8, and the second terminal post 3 is connected with the inner metal cylinder 5 through the conductive block 8. The two end buttons of the insulation resistance meter 1 are connected with the two terminal posts through wires.

[0023] When the utility model is used to detect the relative resistance value of ceramic abrasive, it is easily affected by air humidity and environmental temperature, and therefore the test method is divided into two kinds:

[0024] Method 1: 500g of the sample to be detected is placed in an environment with room temperature of 25 DEG C and air humidity of 45% to 50% for not less than 4 hours. It should be noted that the material and the measuring device should not be directly contacted by hand during the test process. The ceramic abrasive is poured into the discharging cavity, is vibrated and compacted, and is detected by using the insulation resistance meter. The index value of the pointer is the relative resistance value of the filled ceramic abrasive. The resistance value measured by the above method can be directly used for comparison.

[0025] Method 2: 500g of the sample to be detected is directly detected without treatment in a normal environment. When the resistance detection value is relatively high (≥500MΩ), the new sample and the fixed sample are retested in a similar time period, and the detection results of the fixed sample and the new sample are recorded. If the resistance value of the new sample is lower than that of the fixed sample, the new sample can be normally put into the warehouse. If the resistance value of the new sample is higher than that of the fixed sample, the operation of method 1 needs to be rechecked for the batch of products, so as to determine whether measures need to be taken to reduce the relative resistance value of the abrasive.

[0026] The above embodiments are only used to illustrate the technical scheme of the utility model, and cannot limit the protection scope of the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical scheme recorded in the foregoing embodiments can still be modified, or some or all of the technical features can be replaced equivalently. The modification or replacement does not make the essence of the corresponding technical scheme deviate from the scope of the technical scheme of the embodiments of the utility model, and should be covered in the scope of the claims and the description of the utility model.

Claims

1. A resistance measuring device, characterized in that... It includes an insulation resistance meter and a testing mechanism. The testing structure includes two metal cylinders, one large and one small, with a circular cross-section. The two metal cylinders are concentrically mounted on an insulating substrate. The annular space between the two metal cylinders is a feeding chamber. Two terminals are mounted on the insulating substrate. The first terminal is connected to the outer metal cylinder through a conductive block, and the second terminal is connected to the inner metal cylinder through a conductive block. The two terminals of the insulation resistance meter are connected to the two terminals respectively through wires.

2. The resistance measuring device according to claim 1, characterized in that... The insulating substrate is made of wood or plastic.

3. The resistance measuring device according to claim 1, characterized in that... Both metal cylinders are made of stainless steel.

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