Silicon steel sheet insulation resistance measuring instrument

Abstract

The application discloses a silicon steel sheet insulation resistance measuring instrument, which comprises a supporting seat, a test integrated box, a driving mechanism and a controller, a workbench is arranged on the supporting seat, the workbench is used for placing a sample to be measured, the test integrated box is installed on the supporting seat through the driving mechanism, the driving mechanism is used for driving the test integrated box to be close to or away from the workbench, the test integrated box comprises a frame, a contact assembly and a drilling assembly, the contact assembly comprises a contact head and a mounting rod, the first end of the mounting rod is installed on the frame, the contact head is installed on the second end of the mounting rod through a gap structure, the gap structure is used for enabling the contact head to swing in any direction, and the drilling assembly is used for drilling into a sample coating, the contact head, the drilling assembly and the driving mechanism are electrically connected with the controller; the contact assembly can flexibly swing with the aid of the gap structure, the contact head can be completely vertically contacted with the sample, and then better adhesion with the sample surface is achieved, and the testing accuracy and reliability are effectively improved.

Description

Technical Field

[0001] This application relates to the field of insulation resistance testing technology, and in particular to a silicon steel sheet insulation resistance measuring instrument. Background Technology

[0002] The existing devices for testing the insulation resistance coefficient of the coating on the surface of silicon steel sheets are mainly based on the national standard GB / T 2522-2017 Test Method for Insulation Resistance and Adhesion of Coating on Electrical Steel Strips (Sheets). The basic principle described in the standard is to apply a pressure of 129N to each of the 10 contacts with an area of ​​64.5mm2, and then use a sharp drill bit to drill through the coating on the surface of the silicon steel sheet. A voltage of 0.5V is then applied to the drill bit and the contacts, and the insulation resistance coefficient is finally calculated based on the current. Essentially, it measures the resistance formed when the contacts are in flat contact with the surface of the silicon steel sheet.

[0003] The challenge with equipment based on this principle lies in the thin coating on the silicon steel sheet (especially non-oriented silicon steel sheets; some oriented silicon steel sheets also have very thin coatings in certain areas due to uneven coating). Since the standard contact should be rigid, even a slight tilt can cause the rigid contact to directly crush the surface coating, resulting in a short circuit and a surface resistance close to zero, leading to a very large measurement error. In non-extreme cases, even if the contact doesn't penetrate the silicon steel sheet's surface coating, a tilted contact will still reduce the contact area with the sample, thus increasing the contact resistance error.

[0004] Existing testing equipment suffers from the problem of rigid contacts failing to achieve perfectly perpendicular contact with flat silicon steel samples. The rigid contact's overall structure is rigidly connected when pressure is applied, making it impossible to guarantee perpendicular contact during machining and assembly. While some commercially available solutions use soft conductive rubber materials for the contacts, this deviates from the national standard for bronze or stainless steel contacts. This soft contact increases the contact area, and the resistivity of the conductive rubber itself is higher than that of bronze and stainless steel, thus failing to meet national standards. Other products lack specialized contact designs and cannot guarantee perpendicular contact with the sample, resulting in poor measurement repeatability and large measurement errors.

[0005] Therefore, in order to ensure that the contacts of the testing equipment meet national standards and can also ensure that the contacts are in complete perpendicular contact with the sample, so that the testing equipment can accurately measure the resistance formed when the contacts are in flat contact with the surface of the silicon steel sheet, it is necessary to redesign a silicon steel sheet insulation resistance measuring instrument to solve the above problems. Utility Model Content

[0006] The main purpose of this application is to propose a silicon steel sheet insulation resistance measuring instrument, which aims to solve the problem that the contacts of existing testing equipment are difficult to make completely perpendicular contact with the sample.

[0007] To achieve the above objectives, the silicon steel sheet insulation resistance measuring instrument proposed in this application includes: a support base, a test integration box, a drive mechanism, and a controller. The support base is provided with a worktable for placing the sample to be tested. The test integration box is mounted on the support base via the drive mechanism, which is used to drive the test integration box closer to or further away from the worktable.

[0008] The test integration box includes a frame, a contact assembly, and a drilling assembly. The contact assembly includes a contact and a mounting rod. The first end of the mounting rod is mounted on the frame, and the contact is mounted on the second end of the mounting rod through a gap structure. The gap structure allows the contact to swing in any direction. The drilling assembly is used to drill into the sample coating.

[0009] The contact, drilling assembly, and drive mechanism are all electrically connected to the controller.

[0010] Optionally, the gap structure includes a fixed seat, the first end of which is mounted on the mounting rod via a connector, and there are gaps between the fixed seat, the mounting rod, and the connector. The contact is fixedly mounted on the second end of the fixed seat.

[0011] Optionally, the connector is a connecting screw, the second end of the fixing seat has a mounting groove, the first end of the fixing seat and the mounting groove have a through mounting hole, the second end of the mounting rod has a threaded hole, the connecting screw passes through the mounting hole and is threaded into the threaded hole, the length of the connecting screw is greater than the sum of the depth of the threaded hole and the depth of the mounting hole, and the diameter of the connecting screw is smaller than the diameter of the mounting hole.

[0012] Optionally, the frame includes a top plate, a pressure plate, an upper insulating plate, a lower insulating plate, and two side plates. The top plate, pressure plate, upper insulating plate, and lower insulating plate are all perpendicular to the two side plates and are sequentially fixed between the two side plates. The upper insulating plate and the lower insulating plate are used to insulate the contact assembly and the drilling assembly from the frame.

[0013] Optionally, a connecting plate and a pressure sensor are provided between the frame and the drive mechanism. The connecting plate is connected to the drive mechanism, and the two ends of the pressure sensor are respectively connected to the top plate and the connecting plate. The pressure sensor is electrically connected to the controller.

[0014] Optionally, the contact assembly further includes a first spring, a first end of the mounting rod passing through the upper insulating plate and the pressure plate, the mounting rod being slidably connected to the upper insulating plate and not in contact with the pressure plate, the first spring being fitted onto the outer side of the first end of the mounting rod, and an adjusting nut being threaded onto the outer side of the mounting rod, the two ends of the first spring abutting against the upper insulating plate and the adjusting nut respectively, the second end of the mounting rod passing through the lower insulating plate, and the mounting rod being slidably connected to the lower insulating plate.

[0015] Optionally, the drilling assembly includes a spiral guide sleeve, a spiral rod, a jaw, and a drill bit. The spiral guide sleeve is fixedly mounted on the upper insulating plate by a fastener. The first end of the spiral rod passes through the spiral guide sleeve and through the upper insulating plate. The spiral rod engages with a spiral groove in the spiral guide sleeve. The second end of the spiral rod is fixedly connected to the jaw. The jaw passes through the lower insulating plate. The drill bit is mounted on the jaw. A second spring is fitted on the outer side of the spiral rod. The two ends of the second spring abut against the spiral guide sleeve and the jaw, respectively.

[0016] Optionally, the support base includes a first support portion arranged horizontally, a second support portion, and a third support portion arranged vertically. The first support portion and the second support portion are fixedly connected through the third support portion to form a C-shaped structure. The workbench is arranged on the first support portion, and the test integration box is located between the first support portion and the second support portion. A guide cylinder is provided on the second support portion, and a guide rod is slidably arranged inside the guide cylinder. The guide rod passes through the second support portion and is fixedly connected to the test integration box.

[0017] Optionally, a plurality of photoelectric sensors are further provided between the first support and the second support. The plurality of photoelectric sensors are distributed from top to bottom and mounted on the third support via an adjustment plate. The adjustment plate is used to adjust the position of the photoelectric sensors. A sensing sheet is fixedly provided on the test integration box. The sensing sheet extends to the photoelectric sensor. The photoelectric sensor is electrically connected to the controller. The photoelectric sensor is used to sense the position of the test integration box through the sensing sheet.

[0018] Optionally, the driving mechanism includes a drive motor and a lead screw assembly. Both the drive motor and the lead screw assembly are fixedly mounted on the second support. The lead screw assembly is connected to the test integration box. A transmission assembly is connected between the drive motor and the lead screw assembly. The transmission assembly is used to transmit the power of the drive motor to the lead screw assembly. The lead screw assembly is used to drive the test integration box to move up and down.

[0019] This application's technical solution comprises a support base, a test integration box, a drive mechanism, and a controller. The support base has a worktable for placing the sample to be tested. The test integration box is mounted on the support base via the drive mechanism, which moves the test integration box closer to or away from the worktable. The test integration box includes a frame, a contact assembly, and a drilling assembly. The contact assembly includes a contact and a mounting rod. The first end of the mounting rod is mounted on the frame, and the contact is mounted on the second end of the mounting rod via a gap structure. The gap structure allows the contact to swing in any direction. The drilling assembly is used to drill into the sample coating. The contact, drilling assembly, and drive mechanism are all electrically... The controller is connected; the sample to be tested is placed on the worktable, and the controller controls the drive mechanism, which drives the test integrated box to move towards the worktable until the contact component contacts the sample. The drilling component drills into the sample coating, and then the insulation resistance coefficient is calculated based on the current by applying voltage to the drill bit and the contact. After the test, the drive mechanism drives the test integrated box away from the worktable. The contact component can swing flexibly with the help of the gap structure, so that the contact can not only meet the national standard, but also ensure that the contact is in complete perpendicular contact with the sample, thus better adhering to the sample surface and effectively improving the accuracy and reliability of the test. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall structure of the silicon steel sheet insulation resistance measuring instrument of this application;

[0022] Figure 2 This is a schematic diagram of the test integrated box in the silicon steel sheet insulation resistance measuring instrument of this application;

[0023] Figure 3 This is an exploded structural diagram of the test integrated box in the silicon steel sheet insulation resistance measuring instrument of this application;

[0024] Figure 4 This is an exploded structural diagram of the contact component in the silicon steel sheet insulation resistance measuring instrument of this application;

[0025] Figure 5 This is an exploded structural diagram of the drilling assembly in the silicon steel sheet insulation resistance measuring instrument of this application;

[0026] Figure 6 This is a schematic diagram illustrating the force analysis of the inclined contact point in the silicon steel sheet insulation resistance measuring instrument of this application when it contacts the sample.

[0027] Figure 7 For this application Figure 6 Enlarged schematic diagram of the local structure at point I;

[0028] Figure 8 This is a schematic diagram illustrating the force analysis of an inclined contactor in contact with a sample in an existing insulation resistance testing device.

[0029] Explanation of icon numbers:

[0030] 1. Support base; 110. First support part; 111. Workbench; 120. Second support part; 121. Guide cylinder; 122. Guide rod; 130. Third support part; 2. Test integration box; 210. Frame; 211. Top plate; 212. Pressure plate; 213. Upper insulating plate; 214. Side plate; 215. Lower insulating plate; 220. Contact assembly; 221. Contact; 222. Mounting rod; 2221. Threaded hole; 223. Fixing base; 2231. Mounting rod; 2232, Mounting Hole; 224, Connector; 225, First Spring; 226, Adjusting Nut; 230, Drilling Assembly; 231, Spiral Guide Sleeve; 232, Spiral Rod; 233, Clamp; 234, Drill Bit; 235, Second Spring; 236, Fixing Member; 240, Connecting Plate; 250, Pressure Sensor; 3, Drive Mechanism; 310, Drive Motor; 320, Lead Screw Assembly; 330, Transmission Assembly; 4, Photoelectric Sensor; 5, Sample.

[0031] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0033] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly set on the other component; when a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to the other component.

[0034] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0035] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if the word "and / or" appears throughout the text, it means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0036] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0037] Existing testing equipment suffers from the problem of rigid contacts failing to achieve perfectly perpendicular contact with flat silicon steel samples. The rigid contact's overall structure is rigidly connected when pressure is applied, making it impossible to guarantee perpendicular contact during machining and assembly. While some commercially available solutions use soft conductive rubber materials for the contacts, this deviates from the national standard for bronze or stainless steel contacts. This soft contact increases the contact area, and the resistivity of the conductive rubber itself is higher than that of bronze and stainless steel, thus failing to meet national standards. Other products lack specialized contact designs and cannot guarantee perpendicular contact with the sample, resulting in poor measurement repeatability and large measurement errors.

[0038] Therefore, in order to ensure that the contact of the test device is in full vertical contact with the sample while meeting the national standards, so that the test device can accurately measure the resistance formed when the contact is in flat contact with the surface of the silicon steel sheet, it is necessary to redesign a silicon steel sheet insulation resistance measuring instrument to solve the above problems.

[0039] In view of this, the present application proposes a silicon steel sheet insulation resistance measuring instrument.

[0040] In an embodiment of the present application, referring to Figures 1 to 7 , the above-mentioned silicon steel sheet insulation resistance measuring instrument includes: a support base 1, a test integration box 2, a driving mechanism 3 and a controller. A workbench 111 is provided on the support base 1, and the workbench 111 is used to place the待测样品 5. The待测样品 5 is a silicon steel sheet. The test integration box 2 is installed on the support base 1 through the driving mechanism 3, and the driving mechanism 3 is used to drive the test integration box 2 to approach or move away from the workbench 111; the test integration box 2 includes a frame 210, ten contact components 220 and two drilling components 230. The contact component 220 includes a contact 221 and a mounting rod 222. The corners of the contact 221 are all rounded corners, so as to avoid scratching the surface of the sample 5 when the contact 221 contacts the sample 5. The first end of the mounting rod 222 is installed on the frame 210, and the contact 221 is installed at the second end of the mounting rod 222 through a clearance structure. The clearance structure is used to enable the contact 221 to swing in any direction. The drilling component 230 is used to drill into the coating of the sample 5; the contact 221, the drilling component 230, and the driving mechanism 3 are all electrically connected to the controller.

[0041] Specifically, the controller controls the driving mechanism 3 to realize the movement of the test integration box 2. The contact component 220 can swing flexibly by means of the clearance structure, and then better fit the surface of the sample 5. The drilling component 230 is used to penetrate the coating of the sample 5 to ensure the accuracy of the measurement; among them, the contact component 220 can swing flexibly by means of the clearance structure, so that on the premise of meeting the national standards, the contact 221 can also ensure full vertical contact with the sample 5, and then better fit the surface of the sample 5, effectively improving the accuracy and reliability of the test.

[0042] Referring to Figure 4 , the clearance structure includes a fixed seat 223. The first end of the fixed seat 223 is installed on the mounting rod 222 through a connecting member 224. There are clearances between the fixed seat 223 and the mounting rod 222 and the connecting member 224. The contact 221 is fixedly installed at the second end of the fixed seat 223; when the contact component 220 contacts the sample 5, the fixed seat 223 can swing in any direction by virtue of the clearances with the mounting rod 222 and the connecting member 224 under the constraint of the connecting member 224, so that the contact 221 closely fits the surface of the sample 5; enabling the contact 221 to automatically find the position by swinging and fit the surface of the sample 5.

[0043] refer to Figure 4 and Figure 7 The connector 224 is a connecting screw. A mounting groove 2231 is formed at the second end of the fixing seat 223. A through mounting hole 2232 is formed between the first end of the fixing seat 223 and the mounting groove 2231. A threaded hole 2221 is formed on the second end of the mounting rod 222. The connecting screw passes through the mounting hole 2232 and is threaded into the threaded hole 2221. The length of the connecting screw is greater than the sum of the depths of the threaded hole 2221 and the mounting hole 2232, and the diameter of the connecting screw is smaller than the diameter of the mounting hole 2232. The connecting screw passes through the mounting hole 2232 of the fixing seat 223 and is screwed into the threaded hole 2221 of the mounting rod 222. Because the length of the connecting screw is greater than the sum of the depths of the threaded hole 2221 and the mounting hole 2232, and its diameter is smaller than the diameter of the mounting hole 2232, the fixing seat 223 can swing around the connecting screw. The swing function of the fixing seat 223 is achieved by utilizing the gap between the connecting screw and the mounting hole 2232. This provides a simple and reliable gap structure implementation method, ensuring that the contact 221 can swing flexibly.

[0044] refer to Figure 2 and Figure 3 The frame 210 includes a top plate 211, a pressure plate 212, an upper insulating plate 213, a lower insulating plate 215, and two side plates 214. The top plate 211, pressure plate 212, upper insulating plate 213, and lower insulating plate 215 are all perpendicular to the two side plates 214 and are fixedly installed between the two side plates 214 in sequence. The upper insulating plate 213 and lower insulating plate 215 are used to insulate the contact assembly 220 and the drilling assembly 230 from the frame 210. The frame 210 provides support and mounting position for the contact assembly 220 and the drilling assembly 230. The upper insulating plate 213 and lower insulating plate 215 ensure that the contact assembly 220 and the drilling assembly 230 are insulated from the frame 210, preventing current interference, improving the accuracy of the test, and reducing the interference of external factors on the measurement results.

[0045] refer to Figure 2 and Figure 3 A connecting plate 240 and a pressure sensor 250 are provided between the frame 210 and the drive mechanism 3. The connecting plate 240 is connected to the drive mechanism 3, and the two ends of the pressure sensor 250 are connected to the top plate 211 and the connecting plate 240 respectively. The pressure sensor 250 is electrically connected to the controller. The pressure sensor 250 monitors the pressure on the test integrated box 2 in real time and feeds the signal back to the controller. The controller adjusts the action of the drive mechanism 3 according to the pressure, thereby accurately controlling the contact pressure between the test integrated box 2 and the sample 5, and improving the stability and accuracy of the test.

[0046] refer to Figure 3 and Figure 4The contact assembly 220 also includes a first spring 225. The first end of the mounting rod 222 passes through the upper insulating plate 213 and the pressure plate 212. The mounting rod 222 is slidably connected to the upper insulating plate 213 and does not contact the pressure plate 212. The first spring 225 is fitted onto the outer side of the first end of the mounting rod 222. An adjusting nut 226 is also threaded onto the outer side of the mounting rod 222. The two ends of the first spring 225 abut against the upper insulating plate 213 and the adjusting nut 226, respectively. The second end of the mounting rod 222 passes through the lower insulating plate 215, and the mounting rod... 222 is slidably connected to the lower insulating plate 215; when the test integrated box 2 approaches the sample 5, the contact 221 first contacts the sample 5. As the test integrated box 2 continues to move downward, the mounting rod 222 slides relative to the upper insulating plate 213, and the first spring 225 is compressed. The adjusting nut 226 can adjust the preload of the first spring 225, thereby ensuring that the contact pressure between the contact 221 and the sample 5 is stable and improving the repeatability and accuracy of the test. In addition, the first spring 225 also provides a buffering effect, so that the contact 221 and the sample 5 maintain a suitable contact pressure.

[0047] Specifically, during the assembly and debugging process, the adjusting nut 226 can adjust the preload of the first spring 225 to make the pressure of the ten contacts consistent, ensuring that it meets the requirement of ±5% contact resultant force error in the test method.

[0048] refer to Figure 3 and Figure 5 The drilling assembly 230 includes a spiral guide sleeve 231, a spiral rod 232, a clamp 233, and a drill bit 234. The spiral guide sleeve 231 is fixedly mounted on the upper insulating plate 213 by a fastener 236. The first end of the spiral rod 232 passes through the spiral guide sleeve 231 and through the upper insulating plate 213, engaging with the spiral groove inside the spiral guide sleeve 231. The second end of the spiral rod 232 is fixedly connected to the clamp 233, which passes through the lower insulating plate 215. The drill bit... 234 is mounted on the gripper 233. A second spring 235 is fitted on the outside of the spiral rod 232. The two ends of the second spring 235 abut against the spiral guide sleeve 231 and the gripper 233, respectively. When the drill bit 234 contacts the surface of the sample 5, as the test integrated box 2 continues to descend, the spiral rod 232 rotates under the action of the spiral groove of the spiral guide sleeve 231, and drives the gripper 233 and the drill bit 234 to rotate and drill into the coating of the sample 5. The second spring 235 provides cushioning during the drilling process.

[0049] It should be noted that since the pressure measured by the pressure sensor is the sum of the pressures on the drill bit and the contact, the value measured by the pressure sensor is usually directly taken as the contact pressure during testing. Therefore, the smaller the pressure on the drill bit, the smaller the pressure adjustment error of the contact. By utilizing the helical engagement of the spiral guide sleeve 231 and the spiral rod 232, linear motion is converted into rotational motion, realizing the rotary drilling function of the drill bit 234. This allows for drilling through the sample coating with less pressure, thereby reducing the testing error of the pressure sensor. In addition, the drilling assembly 230 can automatically complete the drilling operation, and the second spring 235 can automatically reset the drill bit. The buffering effect of the second spring 235 can prevent the drill bit 234 from excessively drilling into the sample 5, protecting the sample 5 and the drill bit 234. To accommodate sample coatings of different thicknesses, springs with different elastic coefficients can be replaced as needed.

[0050] refer to Figure 1 The support base 1 includes a horizontally arranged first support part 110, a second support part 120, and a vertically arranged third support part 130. The first support part 110 and the second support part 120 are fixedly connected through the third support part 130 to form a C-shaped structure. The workbench 111 is arranged on the first support part 110. The test integration box 2 is located between the first support part 110 and the second support part 120. A guide cylinder 121 is arranged on the second support part 120. A guide rod 122 is slidably arranged in the guide cylinder 121. The guide rod 122 passes through the second support part 120 and is fixedly connected to the test integration box 2. The C-shaped support base 1 provides stable support for the test integration box 2. The sample 5 to be tested is placed on the workbench 111 of the first support part 110. The drive mechanism 3 drives the test integration box 2 to move up and down between the first support part 110 and the second support part 120. The guide rod 122 slides in the guide cylinder 121 to ensure the accuracy and stability of the movement direction of the test integration box 2.

[0051] refer to Figure 1 Multiple photoelectric sensors 4 are provided between the first support part 110 and the second support part 120. The multiple photoelectric sensors 4 are distributed from top to bottom and are mounted on the third support part 130 through an adjustment plate. The adjustment plate is used to adjust the position of the photoelectric sensors 4. A sensing sheet (not shown in the figure) is fixedly installed on the test integrated box 2. The sensing sheet extends to the photoelectric sensor 4. The photoelectric sensor 4 is electrically connected to the controller. The photoelectric sensor 4 is used to sense the position of the test integrated box 2 through the sensing sheet. When the test integrated box 2 moves up and down, the sensing sheet moves with it. The moving sensing sheet will pass through the photoelectric sensor 4. The photoelectric sensor 4 senses the position of the sensing sheet and feeds back the signal to the controller. The controller determines the position of the test integrated box 2 based on the signal. Specifically, the photoelectric sensor 4 uses the principle of light reflection or blocking to detect the position of the sensing sheet and converts the light signal into an electrical signal. It can accurately monitor the position of the test integrated box 2, which facilitates the controller to accurately control the action of the drive mechanism 3.

[0052] refer to Figure 1 The drive mechanism 3 includes a drive motor 310 and a lead screw assembly 320. Both the drive motor 310 and the lead screw assembly 320 are fixedly mounted on the second support part 120. The lead screw assembly 320 is connected to the test integration box 2. A transmission assembly 330 is connected between the drive motor 310 and the lead screw assembly 320. The transmission assembly 330 is used to transmit the power of the drive motor 310 to the lead screw assembly 320, and the lead screw assembly 320 is used to drive the test integration box 2 to move up and down. When the drive motor 310 starts, it transmits the power to the lead screw assembly 320 through the transmission assembly 330, and the lead screw assembly 320 drives the test integration box 2 to move up and down. The lead screw assembly 320 can convert the rotational motion of the drive motor 310 into the linear motion of the lead screw assembly 320, thereby realizing the up and down movement of the test integration box 2.

[0053] It should be noted that this device is used to test the insulation resistance coefficient of the coating on the surface of silicon steel sheets. The main principle is based on the national standard GB / T 2522-2017 Test Method for Insulation Resistance and Adhesion of Coating on Electrical Steel Strips (Sheets). The basic principle described in the standard is to apply a pressure of 129N to each of the 10 contacts with an area of ​​64.5mm2, and then use a sharp drill bit to drill through the coating on the surface of the silicon steel sheet. A voltage of 0.5V is then applied to the drill bit and the contacts. Finally, the insulation resistance coefficient is calculated based on the current. Essentially, it measures the resistance formed when the contacts are in flat contact with the surface of the silicon steel sheet.

[0054] refer to Figure 6 , 7 and Figure 8 In existing contact assemblies, the pressure mounting rod and contact are rigidly connected. In this proposed contact assembly, the mounting rod and contact are a movable structure with a gap. Before contacting the sample, the contact in this proposed assembly will tend to be perpendicular to the sample under gravity. When both existing and proposed contact assemblies contact the sample, the existing contact assembly will have a certain tilt angle, resulting in a contact area that fails to meet the national standard of 64.5 mm². 2 Furthermore, this could potentially damage the insulating coating on the sample surface, leading to incorrect test results. In contrast, the contact assembly in this solution has a movable section. When the contact tip touches the sample surface, because the contact tip and mounting rod are separated, there is no force transmission. Therefore, the contact surface completely conforms to the sample surface. As the contact rod begins to apply pressure, although the applied pressure still has a certain angle, the contact area between the contact tip and the sample is a standard 64.5 mm². 2 The sample is also subjected to uniform stress.

[0055] This application's technical solution comprises a support base, a test integration box, a drive mechanism, and a controller. The support base has a worktable for placing the sample to be tested. The test integration box is mounted on the support base via the drive mechanism, which moves the test integration box closer to or away from the worktable. The test integration box includes a frame, a contact assembly, and a drilling assembly. The contact assembly includes a contact and a mounting rod. The first end of the mounting rod is mounted on the frame, and the contact is mounted on the second end of the mounting rod via a gap structure. The gap structure allows the contact to swing in any direction. The drilling assembly is used to drill into the sample coating. The contact, drilling assembly, and drive mechanism are all electrically... The controller is connected; the sample to be tested is placed on the worktable, and the controller controls the drive mechanism, which drives the test integrated box to move towards the worktable until the contact component contacts the sample. The drilling component drills into the sample coating, and then the insulation resistance coefficient is calculated based on the current by applying voltage to the drill bit and the contact. After the test, the drive mechanism drives the test integrated box away from the worktable. The contact component can swing flexibly with the help of the gap structure, so that the contact can not only meet the national standard, but also ensure that the contact is in complete perpendicular contact with the sample, thus better adhering to the sample surface and effectively improving the accuracy and reliability of the test.

[0056] The above description is merely an optional embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the inventive concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A silicon steel sheet insulation resistance measuring instrument, characterized in that, include: The device includes a support base, a test integration box, a drive mechanism, and a controller. The support base is equipped with a worktable for placing the sample to be tested. The test integration box is mounted on the support base via the drive mechanism, which drives the test integration box to move closer to or away from the worktable. The test integration box includes a frame, a contact assembly, and a drilling assembly. The contact assembly includes a contact and a mounting rod. The first end of the mounting rod is mounted on the frame, and the contact is mounted on the second end of the mounting rod through a gap structure. The gap structure allows the contact to swing in any direction. The drilling assembly is used to drill into the sample coating. The contact, drilling assembly, and drive mechanism are all electrically connected to the controller.

2. The silicon steel sheet insulation resistance measuring instrument as described in claim 1, characterized in that, The gap structure includes a fixed base, the first end of which is mounted on the mounting rod via a connector. There are gaps between the fixed base, the mounting rod, and the connector. The contact is fixedly mounted on the second end of the fixed base.

3. The silicon steel sheet insulation resistance measuring instrument as described in claim 2, characterized in that, The connector is a connecting screw. The second end of the fixing seat has a mounting groove. The first end of the fixing seat and the mounting groove have a through mounting hole. The second end of the mounting rod has a threaded hole. The connecting screw passes through the mounting hole and is threaded into the threaded hole. The length of the connecting screw is greater than the sum of the depth of the threaded hole and the depth of the mounting hole. The diameter of the connecting screw is smaller than the diameter of the mounting hole.

4. The silicon steel sheet insulation resistance measuring instrument as described in claim 1, characterized in that, The frame includes a top plate, a pressure plate, an upper insulating plate, a lower insulating plate, and two side plates. The top plate, pressure plate, upper insulating plate, and lower insulating plate are all perpendicular to the two side plates and are fixedly installed between the two side plates in sequence. The upper insulating plate and the lower insulating plate are used to insulate the contact assembly and the drilling assembly from the frame.

5. The silicon steel sheet insulation resistance measuring instrument as described in claim 4, characterized in that, A connecting plate and a pressure sensor are provided between the frame and the drive mechanism. The connecting plate is connected to the drive mechanism, and the two ends of the pressure sensor are respectively connected to the top plate and the connecting plate. The pressure sensor is electrically connected to the controller.

6. The silicon steel sheet insulation resistance measuring instrument as described in claim 4 or 5, characterized in that, The contact assembly further includes a first spring. The first end of the mounting rod passes through the upper insulating plate and the pressure plate. The mounting rod is slidably connected to the upper insulating plate and does not contact the pressure plate. The first spring is fitted on the outer side of the first end of the mounting rod. An adjusting nut is also threadedly connected to the outer side of the mounting rod. The two ends of the first spring abut against the upper insulating plate and the adjusting nut, respectively. The second end of the mounting rod passes through the lower insulating plate and is slidably connected to the lower insulating plate.

7. The silicon steel sheet insulation resistance measuring instrument as described in claim 4 or 5, characterized in that, The drilling assembly includes a spiral guide sleeve, a spiral rod, a jaw, and a drill bit. The spiral guide sleeve is fixedly mounted on the upper insulating plate by a fastener. The first end of the spiral rod passes through the spiral guide sleeve and through the upper insulating plate. The spiral rod engages with the spiral groove inside the spiral guide sleeve. The second end of the spiral rod is fixedly connected to the jaw. The jaw passes through the lower insulating plate. The drill bit is mounted on the jaw. A second spring is fitted on the outer side of the spiral rod. The two ends of the second spring abut against the spiral guide sleeve and the jaw, respectively.

8. The silicon steel sheet insulation resistance measuring instrument as described in any one of claims 1 to 5, characterized in that, The support base includes a first support part arranged horizontally, a second support part, and a third support part arranged vertically. The first support part and the second support part are fixedly connected through the third support part to form a C-shaped structure. The workbench is arranged on the first support part. The test integration box is located between the first support part and the second support part. A guide cylinder is provided on the second support part. A guide rod is slidably arranged inside the guide cylinder. The guide rod passes through the second support part and is fixedly connected to the test integration box.

9. The silicon steel sheet insulation resistance measuring instrument as described in claim 8, characterized in that, Multiple photoelectric sensors are provided between the first support and the second support. The multiple photoelectric sensors are distributed from top to bottom and mounted on the third support via an adjustment plate. The adjustment plate is used to adjust the position of the photoelectric sensors. A sensing sheet is fixedly provided on the test integration box. The sensing sheet extends to the photoelectric sensor. The photoelectric sensor is electrically connected to the controller. The photoelectric sensor is used to sense the position of the test integration box through the sensing sheet.

10. The silicon steel sheet insulation resistance measuring instrument as described in claim 8, characterized in that, The driving mechanism includes a drive motor and a lead screw assembly. Both the drive motor and the lead screw assembly are fixedly mounted on the second support. The lead screw assembly is connected to the test integration box. A transmission assembly is connected between the drive motor and the lead screw assembly. The transmission assembly is used to transmit the power of the drive motor to the lead screw assembly. The lead screw assembly is used to drive the test integration box to move up and down.

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