Electrostatic diffusivity measuring device

Abstract

The invention discloses an electrostatic diffusivity measuring device, which is used for measuring the electrostatic diffusivity of a sample, and comprises a sample pool for containing the sample; the discharging module comprises a plurality of discharging parts used for discharging the samples to enable the samples to be electrified, and the discharging parts are arranged above the sample pool; the surface potentiometer is connected with the discharge module and is used for measuring the surface potential of the sample; the plurality of discharge parts are arranged along a specific first direction; the surface potentiometers are disposed adjacent to each other in a second direction perpendicular to the first direction with respect to an array line of the plurality of discharge portions. The plurality of discharge parts are provided integrally with the surface potentiometer and are relatively movable in the second direction with respect to the sample. According to the invention, uniform electrification of the sample is realized, and the electrification characteristic measurement accuracy is improved; stable measurement of solid samples can be supported, and stable measurement of fluid samples such as liquid samples and slurry samples can also be supported.

Description

Technical Field

[0001] This invention relates to the field of sample charge measurement technology, and in particular to an electrostatic diffusion rate measuring device. Background Technology

[0002] Currently, the mainstream method for investigating the charge of samples is based on the JIS-C61340-2-1 standard (the corresponding international standard is IEC61340-2-1): the sample is charged, and then the change in its surface potential is measured to assess the sample's charge. However, existing techniques for measuring the surface potential after sample charging have shortcomings in terms of measurement accuracy (especially in controlling the uniformity of sample charge) and applicability to liquid samples. Summary of the Invention

[0003] According to an embodiment of the present invention, an electrostatic diffusivity measuring device is provided for measuring the electrostatic diffusivity of a sample, comprising:

[0004] Sample pool (existing technology), the sample pool is used to hold samples;

[0005] The discharge module includes multiple discharge sections for discharging the sample to make it charge, and the discharge sections are arranged above the sample cell.

[0006] A surface potentiometer, connected to a discharge module, is used to measure the surface potential of a sample.

[0007] Multiple discharge sections are arranged along a specific first direction;

[0008] The surface potentiometers are arranged adjacent to each other in a second direction perpendicular to the first direction, relative to the arrangement lines of the plurality of discharge sections.

[0009] Multiple discharge sections are integrated with the surface potentiometer and can move relative to the sample in a second direction.

[0010] Preferably, three discharge sections are provided.

[0011] Furthermore, while the sample remains stationary, multiple discharge sections and surface potentiometers can move together along the second direction.

[0012] Furthermore, the discharge module also includes: a first drive mechanism (a conventional technical means), a pair of first guide rails, a first support arm, and an auxiliary arm;

[0013] Multiple discharge sections are disposed below the first support arm and connected to the first support arm;

[0014] The auxiliary arm is fixedly connected to the first support arm, and the surface potentiometer is located below the first support arm and connected to the first support arm;

[0015] The first drive mechanism has its output end connected to the first support arm, which can drive the first support arm to move in the second direction.

[0016] Furthermore, the first drive mechanism adopts one of the following: a linear module, a hydraulic cylinder, or a linear motor.

[0017] Furthermore, it also includes: a base, which is used to support the sample pool.

[0018] Furthermore, it also includes: a second drive mechanism (a conventional technical means), the output end of which is connected to the base and can drive the base to move in a second direction. The first drive mechanism and the second drive mechanism can be selected. If the saturation characteristics of the liquid are being measured, the second drive mechanism can be omitted.

[0019] Furthermore, the second drive mechanism adopts one of the following: a linear module, a hydraulic cylinder, or a linear motor.

[0020] Furthermore, it also includes a temperature control module, which is mounted on the base and used to adjust the sample temperature in the sample pool.

[0021] Furthermore, the temperature control module includes a heater and a Peltier element for adjusting the sample temperature to -20°C to 200°C.

[0022] Furthermore, it also includes: control electrodes, a second support arm, and a third drive mechanism (which are conventional technical means).

[0023] The control electrode is used to control the voltage applied to the sample;

[0024] The second support arm is fixedly connected to the control electrode;

[0025] The output end of the third drive mechanism is connected to the second support arm, driving the second support arm to move along the second direction.

[0026] Furthermore, the second drive mechanism adopts one of the following: a linear module, a hydraulic cylinder, or a linear motor.

[0027] The electrostatic diffusion rate measuring device according to embodiments of the present invention achieves uniform charging of the sample, thereby improving the accuracy of charging characteristic measurement; it can not only support stable measurement of solid samples, but also support stable measurement of fluid samples such as liquids and slurries.

[0028] It should be understood that both the foregoing general description and the following detailed description are exemplary and intended to provide further illustration of the claimed technology. Attached Figure Description

[0029] Figure 1 This is a top view conceptual diagram of the discharge section in a state where it is retreating or moving away from the sample cell according to an embodiment of the present invention;

[0030] Figure 2 This is a frontal conceptual diagram of the discharge section in a state where it is retreating or moving away from the sample cell according to an embodiment of the present invention;

[0031] Figure 3 This is a top view conceptual diagram of the discharge section in the state directly above the sample cell according to an embodiment of the present invention;

[0032] Figure 4 for Figure 3 Sectional view along axis AA;

[0033] Figure 5 This is a top-view conceptual diagram of a surface potentiometer according to an embodiment of the present invention, positioned directly above the sample cell.

[0034] Figure 6 for Figure 5 BB-direction sectional view. Detailed Implementation

[0035] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, further illustrating the present invention.

[0036] 1. First Embodiment

[0037] like Figures 1-6 As shown, the electrostatic diffusivity measuring device of this invention evaluates the charge of a sample according to the method specified in JIS-C61340-2-1 (international standard IEC61340-2-1). Simply put, the electrostatic diffusivity measuring device charges the sample with static electricity and then measures the degree of charge dissipation (the degree of reduction in charge). The type of sample is not particularly limited; for example, it may include particles, powders, liquids, etc. Furthermore, substances such as metals, plastics, rubber, fabrics, ceramics, inks, pastes, and non-flammable greases can also be used as samples for measurement.

[0038] exist Figure 1 In this design, the X-axis and Y-axis are mutually perpendicular horizontal axes, forming a horizontal plane, and the Z-axis is a vertical axis. The base 101 is a plate-shaped base made of metal and is grounded. Figure 2 , 4As shown in Figure 6, the base 101 houses a heater 141 and is also equipped with a Peltier element 142 for cooling. By heating the heater 141, the sample cell 102 can be heated, thereby heating the sample contained within the sample cell 102; by cooling the base 101 through the Peltier element 142, the sample cell 102 can be cooled, thereby cooling the sample contained within the sample cell 102. Using the heater 141 and the Peltier element 142, the sample can be adjusted to the desired temperature, with a temperature adjustment range, for example, -20°C to 200°C. The electrostatic diffusivity measuring device may also be provided with a housing (casing) covering the entire device; however, illustrations and descriptions of this housing are omitted here. Alternatively, a structure can be adopted in which the housing serves as a constant temperature and humidity chamber, housing the electrostatic diffusivity measuring device within it.

[0039] like Figures 1-2 As shown, a sample pool 102 for holding samples is placed above the base 101. The sample pool 102 can be prepared according to the material of the sample. The example shown here is a single sample pool 102, but there can also be two or more sample pools 102. When there are two or more sample pools 102, they are arranged at specific intervals along the Y-axis direction in the figure.

[0040] like Figures 1-5 As shown, the electrostatic diffusion rate measuring device includes discharge sections 111, 112, and 113 arranged horizontally along the X-axis. These discharge sections have the same structure and performance, capable of corona discharge, causing the sample contained in the sample cell 102 to become electrostatically charged. The discharge sections 111, 112, and 113 are fixed at specific intervals to a first support arm 114 extending along the X-axis. The first support arm 114 is movable in a horizontal direction perpendicular to the X-axis, i.e., the Y-axis direction. When the first support arm 114 moves along the Y-axis direction, the discharge sections 111, 112, and 113 also move horizontally along the Y-axis direction. A first drive mechanism drives the first support arm 114 to move on first guide rails 115 and 116 extending along the Y-axis direction. When discharging the sample contained in the sample cell 102, the discharge section 112 needs to be moved above the sample cell 102 and kept stationary.

[0041] like Figure 1 As shown, an auxiliary arm 120 for supporting the surface potentiometer 121 is fixed on the first support arm 114. The auxiliary arm 120 protrudes in the Y-axis direction, and the surface potentiometer 121 is fixed at its lower part. When the first support arm 114 moves in the Y-axis direction, the surface potentiometer 121 also moves in the Y-axis direction. That is, the discharge parts 111, 112, and 113 are integrated with the surface potentiometer 121 and move in the Y-axis direction.

[0042] like Figures 1-2As shown, a control electrode 130 can be inserted between the sample cell 102 and the discharge sections 111, 112, and 113. The control electrode 130 is a planar metal electrode to which a control voltage can be applied. The discharge voltage of the discharge sections 111, 112, and 113 is, for example, 6 kV. For some types of samples, the voltage applied to the sample may be too high. Furthermore, in some cases, it is necessary to know the charge of the sample under a specific electric field strength environment. For these cases, the control electrode 130 can be inserted between the sample cell 102 and the discharge sections 111, 112, and 113, and the voltage applied to the control electrode 130 (control voltage) can be adjusted to adjust the voltage applied to the sample contained in the sample cell 102. The range of the control voltage is, for example, 0V to ±1000V.

[0043] like Figures 1-2 As shown, the control electrode 130 is supported by the second support arm 131 and moves along the Y-axis under the drive of the third drive mechanism. Figure 1 The state shown is the state after the control electrode 130 has retracted from above the sample cell 102.

[0044] Arrangement of the discharge section:

[0045] like Figure 1 As shown, arranging discharge sections 111, 112, and 113 along the X-axis ensures uniform discharge of the sample contained in the sample pool 102 along the X-axis, meaning the sample can be uniformly charged along the X-axis. Furthermore, arranging discharge sections 111 and 113 on either side of discharge section 112 along the X-axis allows the discharge areas of the three sections to overlap in the Y-axis direction. Using discharge section 112 as a reference, the discharge area in the Y-axis direction is expanded, thereby ensuring uniform discharge of the sample pool 102 in the Y-axis direction, i.e., achieving uniform charging of the sample in the Y-axis direction. Through this arrangement, uniform discharge of the sample in both the X-axis and Y-axis directions is ensured, enabling the sample to be uniformly charged.

[0046] If only one discharge section 112 is provided, the uniformity of discharge to sample cell 102 in the horizontal direction will be insufficient. In this case, the measurement accuracy of sample charge will decrease.

[0047] Furthermore, assuming that the discharge sections 111, 112, and 113 are arranged along the Y-axis, the following problem will arise. The measurement of the sample's charge is performed according to the following steps:

[0048] First, the discharge section 112 is moved directly above the sample cell 102, and the sample is charged by the discharge of the discharge sections 111, 112, and 113. At this time, if necessary, a control electrode 130 with a specific voltage is inserted between the sample cell 102 and the discharge section. Next, the discharge sections 111, 112, and 113 are moved away from above the sample cell 102, and the surface potentiometer 121 is moved above the sample cell 102 to measure the change in the sample surface potential as the charge dissipates.

[0049] During this process, after the sample becomes charged, the discharge sections 111, 112, and 113 need to be quickly moved away from above the sample cell 102, and the surface potentiometer 121 needs to be moved above the sample cell 102. This is because after the discharge sections 111, 112, and 113 stop discharging, the charge on the sample will immediately begin to dissipate, and in the initial stage of dissipation, the degree of charge dissipation is relatively large. At this time, the change in the sample surface potential is crucial for assessing the charge of the sample.

[0050] Assuming the discharge sections are arranged along the Y-axis, the time required for these discharge sections 111, 112, and 113 to retract from above the sample pool 102 after the discharge is complete will be less than... Figure 1 The structure shown is even longer. Specifically, assuming the first support arm 114 moves at the same speed, it is arranged along the X-axis with the discharge units 111, 112, and 113 ( Figure 1 Compared to the case shown in the diagram, the time required for retreat will increase by more than two times. This would prevent meeting the requirement that "the surface potential of the sample should be measured as soon as possible after it is charged."

[0051] Arranging the discharge sections 111, 112, and 113 along the X-axis not only ensures the uniformity of discharge to the sample cell 102 in both the X and Y axes, but also has the advantage of shortening the time interval between the sample being charged and the start of potential measurement.

[0052] In the electrostatic diffusion rate measuring device, the base 101 remains stationary during the measurement process, as does the sample cell 102 placed on the base 101. Therefore, this device can measure highly fluid samples such as liquids and slurries. Simultaneously, thanks to the arrangement of the discharge section and the surface potentiometer 121, the device can achieve uniform charging of the sample and shorten the time interval between the end of charging and the start of surface potential measurement. Therefore, this device can not only measure the charge of the sample with high precision but also measure the decrease in surface potential (charge reduction) of the sample's charge in the initial stage of dissipation with high precision.

[0053] 2. Second Embodiment

[0054] like Figures 1-6As shown, the electrostatic diffusion rate measuring device of this embodiment can also be implemented by fixing the first support arm 114, making the base 101 a movable platform that can move along the axial direction. In this embodiment, the relative positional relationship between the sample cell 102 and the discharge unit, and the relative positional relationship between the sample cell 102 and the surface potentiometer 121 during measurement, are the same as in the first embodiment. Furthermore, the method of using the control electrode 130 is also the same as in the first embodiment.

[0055] In this embodiment, since the sample may move, it may flow when using highly fluid samples such as liquids or slurries. Therefore, in some cases, this embodiment may not be suitable for measuring highly fluid samples such as liquids or slurries (depending on the sample's fluidity). However, compared to the first embodiment, the wiring arrangement for connecting the discharge units 111, 112, and 113 that process high-voltage electricity, and the structure and wiring arrangement for supporting and connecting the surface potentiometer 121 that processes weak signals, are simpler in this embodiment. Therefore, this embodiment can reduce device costs and has advantages in terms of maintainability.

[0056] In this embodiment, a control electrode 130 may be used, which can be inserted between the sample and the discharge sections 111, 112, and 113. Alternatively, an embodiment may be used, comprising a heater 141 and a Peltier element 142, which serve as a sample temperature regulating mechanism for adjusting the sample temperature.

[0057] The first, second, and third drive mechanisms are not shown in the accompanying drawings.

[0058] Above, refer to Figures 1-6 An electrostatic diffusion rate measuring device according to an embodiment of the present invention is described, which achieves uniform charging of the sample and improves the accuracy of charging characteristic measurement; it can support stable measurement of fluid samples such as liquids and slurries.

[0059] It should be noted that, in this specification, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes that element.

[0060] Although the present invention has been described in detail through the preferred embodiments above, it should be understood that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions to the present invention will be apparent to those skilled in the art after reading the above description. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. An electrostatic diffusivity measuring device for measuring the electrostatic diffusivity of a sample, characterized in that, Include: A sample pool, used to hold the sample; A discharge module comprising a plurality of discharge sections for discharging a sample to charge it, the discharge sections being disposed above the sample cell; A surface potentiometer, connected to the discharge module, is used to measure the surface potential of the sample; The plurality of discharge sections are arranged along a specific first direction; The surface potentiometers are arranged adjacent to each other in a second direction perpendicular to the first direction, relative to the arrangement lines of the plurality of discharge sections. The plurality of discharge sections are integrally disposed with the surface potentiometer and are capable of relative movement with respect to the sample in the second direction.

2. The electrostatic diffusivity measuring device as described in claim 1, characterized in that, The sample remains stationary, while the plurality of discharge sections and the surface potentiometer can move together along the second direction.

3. The electrostatic diffusion rate measuring device as described in claim 1 or 2, characterized in that, The discharge module further includes: a first drive mechanism, a pair of first guide rails, a first support arm, and an auxiliary arm; The plurality of discharge units are disposed below the first support arm and connected to the first support arm; The auxiliary arm is fixedly connected to the first support arm, and the surface potentiometer is disposed below the first support arm and connected to the first support arm; The first driving mechanism has its output end connected to the first support arm, and can drive the first support arm to move along the second direction.

4. The electrostatic diffusivity measuring device as described in claim 1, characterized in that, It also includes: a base for supporting the sample pool.

5. The electrostatic diffusion rate measuring device as described in claim 4, characterized in that, It also includes: a second drive mechanism, the output end of which is connected to the base and can drive the base to move along the second direction.

6. The electrostatic diffusivity measuring device as described in claim 4, characterized in that, It also includes a temperature control module, which is mounted on the base and is used to adjust the sample temperature in the sample pool.

7. The electrostatic diffusivity measuring device as described in claim 6, characterized in that, The temperature control module includes a heater and a Peltier element for adjusting the sample temperature to -20°C to 200°C.

8. The electrostatic diffusivity measuring device as described in claim 1, characterized in that, It also includes: control electrodes, a second support arm, and a third drive mechanism; The control electrode is used to control the voltage of the sample; The second support arm is fixedly connected to the control electrode; The output end of the third drive mechanism is connected to the second support arm, driving the second support arm to move along the second direction.

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