Nondestructive testing equipment for piezoresistor

Abstract

The invention belongs to the technical field of piezoresistor detection, and particularly relates to nondestructive testing equipment for a piezoresistor, which comprises a support frame, a limiting plate and the like, a limiting plate is installed on the supporting frame. According to the invention, all the conductive elastic sheets are electrified and then all the conductive elastic sheets move, so that all the conductive elastic sheets touch the pins of the corresponding piezoresistors, and the conductive elastic sheets are arranged to be n-shaped structures, so that the middle positions of the conductive elastic sheets are concave inwards; according to the invention, the conductive elastic sheets are arranged on the piezoresistors, so that the conductive elastic sheets can be in better contact with the pins of the piezoresistors to prevent broken contact, all the piezoresistors are detected through an infrared thermal imager, if the temperature range of any one of the piezoresistors after being electrified exceeds a standard value, the piezoresistor is abnormal after being electrified, the piezoresistor is judged to be a defective product, and the defective product is judged to be a non-defective product. And meanwhile, the audible and visual alarm operates to give an audible and visual alarm.

Description

Technical Field

[0001] The present invention belongs to the technical field of varistor detection, and particularly relates to a non-destructive detection device for varistors. Background Art

[0002] A varistor is short for a voltage-sensitive resistor, which is a non-linear resistor element. It has the characteristics of a wide operating voltage range, fast response to overvoltage pulses, strong ability to withstand impact current, small leakage current, and small resistance temperature coefficient. It is an ideal protection element and is widely used in household appliances and other electronic products. It is often used to form overvoltage protection circuits, noise elimination circuits, spark elimination circuits, lightning protection circuits, surge voltage absorption circuits, and protect semiconductor components. Based on the prior art, it is found that during the production and processing of zinc oxide varistors, in order to ensure the quality of varistors, varistors need to be detected. However, based on the prior art, it is found that most of the existing detection methods detect varistors through a multimeter. This method is inefficient, not safe enough, and cannot detect the structural strength of varistors at the same time, resulting in the easy neglect of the structural stability of varistors, and thus there are greater risks and potential safety hazards in the subsequent use of varistors. Summary of the Invention

[0003] In order to overcome the disadvantages of the existing method for detecting varistors, which is inefficient and not safe enough, the present invention provides a non-destructive detection device for varistors.

[0004] The technical solution of the present invention is as follows: A non-destructive detection device for varistors includes a support frame; it also includes a limit plate, an electric actuator I, a fixing plate, a conductive elastic sheet, a mounting frame, a CCD camera, an infrared thermal imager, and a marking component; the limit plate is installed on the support frame, and a long strip-shaped through groove is opened on the limit plate; several electric actuators I are installed on the support frame, and the electric actuators I are distributed on both sides of the support frame; the telescopic parts of all the electric actuators I on the same side are commonly fixed to a fixing plate; several conductive elastic sheets are arranged on each fixing plate; the mounting frame is fixedly connected to the support frame; the CCD camera is installed on the mounting frame; the infrared thermal imager is installed on the mounting frame; a marking component for marking defective varistors is connected to the support frame.

[0005] As a further preferred solution, an audible and visual alarm is installed on the support frame.

[0006] As a further preferred solution, the cross-section of the limit plate is semi-circular, and an anti-slip coating is applied to the inner side of the limit plate.

[0007] As a further preferred solution, the conductive elastic sheet is arranged in an n-shaped structure, and the middle position of the conductive elastic sheet is concave inward.

[0008] As a further preferred solution, it further includes a limiting strip; the limiting strip is fixedly connected to the lower part of the limiting plate, and the limiting strip is made of rubber material.

[0009] As a further preferred solution, the marking assembly includes an electric slide rail, an electric slider, an electric actuator II, and a marker pen; the electric slide rail is fixedly connected to the support frame; the electric slider is slidably connected to the electric slide rail; the electric actuator II is fixedly connected to the lower part of the electric slider; the telescopic part of the electric actuator II is equipped with a marker pen.

[0010] As a further preferred solution, the overall shape of the marker pen is conical, and the marker pen is overall set to be inclined.

[0011] As a further preferred solution, it further includes that a conduit is fixedly connected to each fixing plate; a number of spray heads are connected to each conduit, and each spray head corresponds to a conductive elastic sheet.

[0012] As a further preferred solution, it further includes a clamping and limiting system; the clamping and limiting system is connected to the support frame; the clamping and limiting system includes an electric actuator III, a connecting plate I, a clamping plate I, an electric actuator IV, a connecting plate II, and a clamping plate II; at least two electric actuators III are fixedly connected to the support frame; a connecting plate I is fixedly connected to the telescopic part of each electric actuator III, and the connecting plate I is made of insulating material; a number of clamping plates I are fixedly connected to each connecting plate I, and the clamping plates I are made of insulating material; at least two electric actuators IV are fixedly connected to the support frame; a connecting plate II is fixedly connected to the telescopic part of each electric actuator IV, and the connecting plate II is made of insulating material; a number of clamping plates II are fixedly connected to each connecting plate II, and the clamping plates II are made of insulating material.

[0013] As a further preferred solution, a blocking part protruding upward is arranged at one end of the clamping plate II away from the connecting plate II.

[0014] The advantages and positive effects of the present invention are: (1), By making all the conductive elastic sheets energized, and then moving all the conductive elastic sheets, so that all the conductive elastic sheets touch the pins of the corresponding varistors. And because the conductive elastic sheet is set in an n-shaped structure, the middle position of the conductive elastic sheet is concave inward, so that the conductive elastic sheet can better contact the pins of the varistor, preventing disconnection. Then, all the varistors are detected by an infrared thermal imager. If the temperature range of any varistor exceeds the standard value after being energized, it means that the varistor is abnormal after being energized and is determined to be a defective product. At the same time, the sound and light alarm operates to emit a sound and light alarm.

[0015] (2) By moving the marker pen to touch the abnormal varistor and marking the abnormal varistor, the energization detection of the varistor is realized, and the abnormal varistor is marked with the marker pen, so as to facilitate the subsequent manual picking out of the abnormal varistors, thereby improving the quality of the varistors.

[0016] (3) When the conductive elastic sheet moves, it will squeeze the pins of the varistor, thereby causing the pins of the varistor to be pressed. Then, the pins of all varistors are detected by the CCD camera. If the pins of the varistor become loose after being pressed, it indicates that the pins of the varistor are abnormal, and it is determined that the structure of the varistor is not firm. Then, the varistors with unstable structures are marked with a marker pen, so as to realize the detection of the structural strength of the varistors and mark the varistors with unstable structures, so as to facilitate the subsequent manual picking out of the varistors with unstable structures.

[0017] (4) Through multiple nozzles, the nozzles blow out gas and blow it towards the corresponding conductive elastic sheets and the pins of the corresponding varistors, so as to realize the cleaning of the conductive elastic sheets and the pins of the varistors, thereby blowing off dust and other impurities on the conductive elastic sheets and the pins of the varistors, thereby reducing the occurrence of poor contact when the pins of the varistors contact the conductive elastic sheets, and thereby improving the accuracy of the energization detection of the varistors.

[0018] (5) By cooperating the clamping plate II with the clamping plate I to limit the pins of the varistor, when the conductive elastic sheet moves to squeeze the pins of the varistor, the lower part of the pins of the varistor can remain stable, reducing the possibility of displacement, thereby improving the accuracy of the detection of the structural stability of the varistor. Description of the Drawings

[0019] Figure 1 It is a first - perspective three - dimensional structure schematic diagram of the non - destructive testing equipment for varistors of the present invention; Figure 2 It is a second - perspective three - dimensional structure schematic diagram of the non - destructive testing equipment for varistors of the present invention; Figure 3 It is a three - dimensional structure schematic diagram of the combination of varistor, foam board and rubber strip of the non - destructive testing equipment for varistors of the present invention; Figure 4 It is a three - dimensional structure schematic diagram of the combination of limit plate, electric actuator I, fixed plate, conductive elastic sheet, mounting rack, CCD camera, infrared thermal imager, electric slide rail, electric slider and electric actuator II of the non - destructive testing equipment for varistors of the present invention; Figure 5Schematic diagram of the three-dimensional structure of the limit plate, limit strip, electric slide rail, electric slider, electric actuator II and marker pen of the non-destructive testing equipment for varistors of the present invention; Figure 6 Schematic diagram of the installation positions of the conduit and nozzle of the non-destructive testing equipment for varistors of the present invention; Figure 7 Schematic diagram of the three-dimensional structure of the electric actuator I, fixing plate, conductive elastic sheet, conduit and nozzle of the non-destructive testing equipment for varistors of the present invention; Figure 8 Schematic diagram of the pressure-bearing state of the varistor of the non-destructive testing equipment for varistors of the present invention; Figure 9 Schematic diagram of the three-dimensional structure of the clamping and limiting system of the non-destructive testing equipment for varistors of the present invention; Figure 10 Schematic diagram of the three-dimensional structure of the electric actuator III, connecting plate I, clamping plate I, electric actuator IV, connecting plate II and clamping plate II of the non-destructive testing equipment for varistors of the present invention.

[0020] In the figure: 1 - support frame, 11 - sound and light alarm, 2 - varistor, 21 - foam board, 22 - rubber strip, 201 - limit plate, 2011 - limit strip, 202 - electric actuator I, 203 - fixing plate, 204 - conductive elastic sheet, 205 - mounting bracket, 206 - CCD camera, 207 - infrared thermal imager, 208 - electric slide rail, 209 - electric slider, 210 - electric actuator II, 211 - marker pen, 301 - conduit, 302 - nozzle, 401 - electric actuator III, 402 - connecting plate I, 403 - clamping plate I, 404 - electric actuator IV, 405 - connecting plate II, 406 - clamping plate II, 4061 - blocking part. Detailed implementation manners

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0022] Embodiment 1: A non-destructive testing equipment for varistors, according to Figures 1-8 as shown, includes a support frame 1; It further includes a limit plate 201, an electric actuator I 202, a fixing plate 203, a conductive elastic sheet 204, a mounting bracket 205, a CCD camera 206, an infrared thermal imager 207 and a marking assembly; the limit plate 201 is mounted on the support frame 1, and a long strip-shaped through groove is provided on the limit plate 201; four electric actuators I 202 are mounted on the support frame 1, the electric actuator I 202 is an electric push rod, and the electric actuators I 202 are distributed on both sides of the support frame 1; the telescopic parts of all the electric actuators I 202 on the same side are fixedly connected to a fixing plate 203 together; a plurality of conductive elastic sheets 204 are arranged on each fixing plate 203; the mounting bracket 205 is fixedly connected to the support frame 1; the CCD camera 206 is mounted on the mounting bracket 205; the infrared thermal imager 207 is mounted on the mounting bracket 205; the marking assembly is connected to the support frame 1.

[0023] An audible and visual alarm 11 is mounted on the support frame 1. When the infrared thermal imager 207 detects an abnormal phenomenon of the varistor 2, it emits a sound and flashes through the audible and visual alarm 11 to remind the on-site staff.

[0024] The cross-section of the limit plate 201 is semi-circular ring-shaped, and an anti-slip coating is coated on the inner side of the limit plate 201, which is used to limit the varistor 2 and increase the friction between the limit plate 201 and the varistor 2.

[0025] The conductive elastic sheet 204 is set in an n-shaped structure, and the middle position of the conductive elastic sheet 204 is concave inward, which is used to better contact the pins of the varistor 2 and prevent disconnection.

[0026] It further includes a limit strip 2011; the limit strip 2011 is fixedly connected to the lower part of the limit plate 201, and the limit strip 2011 is made of rubber, which is used to limit the varistor 2.

[0027] The marking assembly includes an electric slide rail 208, an electric slide block 209, an electric actuator II 210 and a marking pen 211; the electric slide rail 208 is fixedly connected to the support frame 1; the electric slide block 209 is slidably connected to the electric slide rail 208; the electric actuator II 210 is fixedly connected to the lower part of the electric slide block 209, and the electric actuator II 210 is an electric push rod; the marking pen 211 is mounted on the telescopic part of the electric actuator II 210.

[0028] The whole of the marking pen 211 is set in a conical shape, and the whole of the marking pen 211 is set in an inclined shape, so as to move to two adjacent varistors 2 and mark the defective varistor 2.

[0029] It further includes that a conduit 301 is fixedly connected to each fixing plate 203; a plurality of nozzles 302 are fixedly connected and communicated to each conduit 301, and each nozzle 302 corresponds to a conductive elastic sheet 204 respectively.

[0030] It should be noted that multiple varistors 2 are arranged neatly, and the lower ends of the leads of multiple varistors 2 are all inserted into the foam board 21, and a rubber strip 22 is adhesively bonded to the leads on the same side of multiple varistors 2, so that multiple varistors 2 remain stable during transfer. Since most of the existing detection methods detect the varistors 2 through a multimeter, the efficiency is low, the safety is not high, and the structural strength of the varistors 2 cannot be detected simultaneously, resulting in the easy neglect of the structural stability of the varistors 2, and thus there is a greater risk in the subsequent use process of the varistors 2, leaving a potential safety hazard; To solve the above problems, when this device is in use, first connect two fixing plates 203 to an external power supply, so that all the conductive elastic sheets 204 are energized. Then connect an external pump to two conduits 301, and make the distance between two adjacent varistors 2 the same. Then place multiple neatly arranged varistors 2 into the lower part of the support frame 1, so that the lower part of the support frame 1 provides support for the foam board 21. At the same time, the upper parts of all varistors 2 come into contact with the inner side of the limiting plate 201, and the varistors 2 are placed more stably through the setting of the limiting strip 2011. Then control all the electric actuators I 202 to start. The telescopic parts of two electric actuators I 202 on the same side move respectively to drive a fixing plate 203 to move, so that the two fixing plates 203 move towards each other. The two fixing plates 203 drive all the conductive elastic sheets 204 to move, so that all the conductive elastic sheets 204 touch the leads of the corresponding varistors 2. Since the conductive elastic sheet 204 is set in an n-shaped structure and the middle position of the conductive elastic sheet 204 is concave inward, the conductive elastic sheet 204 can better contact the leads of the varistor 2 to prevent disconnection. Due to the characteristics of the varistor 2 being affected by aging, moisture or material deterioration, the leakage current of the varistor 2 increases significantly (far exceeding the normal value), resulting in overheating of the varistor 2 after power-on. At this time, use an infrared thermal imager 207 to detect all the varistors 2. If the temperature range of any varistor 2 after power-on exceeds the standard value, it means that the varistor 2 is abnormal after power-on and is judged as a defective product. At the same time, the sound and light alarm 11 operates to emit a sound and light alarm; After the abnormal varistor 2 is detected, the electric slider 209 is controlled to start moving along the electric slide rail 208. The movement of the electric slider 209 drives the movement of the electric actuator II 210, and the movement of the electric actuator II 210 drives the movement of the marker pen 211, so that the marker pen 211 moves above the abnormal varistor 2. Then, the electric actuator II 210 is controlled to start. The telescopic part of the electric actuator II 210 moves to drive the marker pen 211 to move downward, so that the marker pen 211 moves to touch the abnormal varistor 2 and marks the abnormal varistor 2, thereby realizing the power-on detection of the varistor 2 and marking the abnormal varistor 2 with the marker pen 211, so as to facilitate the subsequent manual picking out of the abnormal varistor 2, thus improving the quality of the varistor 2; Moreover, the two fixing plates 203 move towards each other to drive all the conductive elastic pieces 204 to move, and make the conductive elastic pieces 204 contact with the pins of the varistor 2. During this process, the movement of all the conductive elastic pieces 204 will cause extrusion on the pins of the varistor 2, so that the pins of the varistor 2 are under pressure, as Figure 8 shown. Then, the pins of all the varistors 2 are detected by the CCD camera 206. If the pins of the varistor 2 show looseness after being under pressure, it means that the pins of the varistor 2 are abnormal, and it is determined that the structure of the varistor 2 is not firm. Then, the electric slider 209 is controlled to start moving along the electric slide rail 208 with the same working principle as above. The movement of the electric slider 209 drives all the connected components to move, so that the marker pen 211 moves above the varistor 2 with an unstable structure. Then, the electric actuator II 210 is controlled to operate, and the marker pen 211 is used to mark the varistor 2 with an unstable structure, thereby realizing the detection of the structural strength of the varistor 2 and marking the varistor 2 with an unstable structure, so as to facilitate the subsequent manual picking out of the varistor 2 with an unstable structure.

[0031] It should be noted that, to further improve the accuracy of the power-on detection of the varistor 2, since dust and other impurities are likely to adhere to the pins of the varistor 2 during the production process and subsequent handling and storage, resulting in poor contact when the pins of the varistor 2 come into contact with the conductive elastic sheet 204 due to the presence of impurities, thus affecting the accuracy of the power-on detection of the varistor 2. Therefore, before the power-on detection of the varistor 2, the operation of the peripheral pump is controlled to inject gas into the two conduits 301, so that the gas is blown from the multiple nozzles 302 on the conduit 301 to the corresponding conductive elastic sheet 204 and the pins of the corresponding varistor 2, thereby realizing the cleaning of the conductive elastic sheet 204 and the pins of the varistor 2, blowing off the dust and other impurities on the conductive elastic sheet 204 and the pins of the varistor 2, reducing the occurrence of poor contact when the pins of the varistor 2 come into contact with the conductive elastic sheet 204, and improving the accuracy of the power-on detection of the varistor 2.

[0032] Embodiment 2: Based on Embodiment 1, according to Figures 9-10 As shown, it further includes a clamping and limiting system; a clamping and limiting system is connected to the support frame 1; the clamping and limiting system includes an electric actuator III 401, a connecting plate I 402, a clamping plate I 403, an electric actuator IV 404, a connecting plate II 405, and a clamping plate II 406; two electric actuators III 401 are fixedly connected to the support frame 1, and the electric actuator III 401 is an electric push rod; a connecting plate I 402 is fixedly connected to the telescopic part of each electric actuator III 401, and the connecting plate I 402 is made of insulating material; a number of clamping plates I 403 are fixedly connected to each connecting plate I 402, and the clamping plate I 403 is made of insulating material; two electric actuators IV 404 are fixedly connected to the support frame 1, and the electric actuator IV 404 is an electric push rod; a connecting plate II 405 is fixedly connected to the telescopic part of each electric actuator IV 404, and the connecting plate II 405 is made of insulating material; a number of clamping plates II 406 are fixedly connected to each connecting plate II 405, and the clamping plate II 406 is made of insulating material.

[0033] One end of the clamping plate II 406 away from the connecting plate II 405 is provided with an upward protruding blocking portion 4061 for cooperating with the clamping plate I 403 to jointly limit the pins of the varistor 2.

[0034] Since a rubber strip 22 is adhesively bonded to the pins on each same side of the varistor 2, and the lower ends of the pins of multiple varistors 2 are inserted into the foam board 21, when the conductive elastic sheet 204 moves to squeeze the pins of the varistor 2, the pins of the varistor 2 are prone to displacement, which may lead to errors in the structural stability detection of the varistor 2. To further improve the accuracy of the structural stability detection of the varistor 2, after multiple varistors 2 are moved to the support frame 1, all the electric actuators III 401 are controlled to start. The telescopic part of each electric actuator III 401 moves to drive a connecting plate I 402 to move respectively, and the movement of each connecting plate I 402 drives the corresponding clamping plate I 403 to move, so that each clamping plate I 403 moves to abut against the side surface of the pin of the varistor 2. Then, all the electric actuators IV 404 are controlled to start. The telescopic part of each electric actuator IV 404 moves to drive a connecting plate II 405 to move respectively, and the movement of each connecting plate II 405 drives the corresponding clamping plate II 406 to move, so that each clamping plate II 406 moves to abut against the side surface of the pin of the varistor 2, and each clamping plate II 406 intersects with the corresponding clamping plate I 403. And through the arrangement of the blocking part 4061, the pins of the varistor 2 can be better limited, as Figure 10 shown, so that the clamping plate II 406 and the clamping plate I 403 cooperate to limit the pins of the varistor 2. When the conductive elastic sheet 204 moves to squeeze the pins of the varistor 2, the lower part of the pins of the varistor 2 can be kept stable, reducing the possibility of displacement, thereby improving the accuracy of the structural stability detection of the varistor 2.

[0035] Although the present invention has been described with reference to exemplary embodiments, it should be understood that the present invention is not limited to the disclosed exemplary embodiments. The scope of the following claims should be given the broadest interpretation so as to cover all variations and equivalent structures and functions.

Claims

1. A non-destructive testing device for a varistor, comprising a support frame (1); characterized in that: The invention also comprises a limit plate (201), an electric actuator I (202), a fixing plate (203), a conductive spring (204), a mounting frame (205), a CCD camera (206), an infrared thermal imager (207) and a marking assembly; the limit plate (201) is mounted on the support frame (1), and a long through slot is formed on the limit plate (201); a plurality of electric actuators I (202) are mounted on the support frame (1), and the electric actuators I (202) are distributed on the support frame (1). On both sides; the telescopic parts of all electric actuators I (202) on the same side are fixedly connected to a fixed plate (203); each fixed plate (203) is provided with a plurality of conductive springs (204); a mounting frame (205) is fixedly connected to the support frame (1); a CCD camera (206) is installed on the mounting frame (205); an infrared thermal imager (207) is installed on the mounting frame (205); and a marking component for marking a defective varistor (2) is connected to the support frame (1).

2. A nondestructive testing device for a varistor according to claim 1, characterized in that: An audible and visual alarm (11) is mounted on the support frame (1).

3. The nondestructive testing device for varistor according to claim 1, characterized in that: The cross section of the limiting plate (201) is semicircular, and the inner side of the limiting plate (201) is coated with an anti-slip coating.

4. The nondestructive testing device for varistor according to claim 1, characterized in that: The conductive spring sheet (204) is arranged in an n-shaped structure, and the middle portion of the conductive spring sheet (204) is concave inwards.

5. The nondestructive testing device for varistor according to claim 1, characterized in that: It also includes a limiting strip (2011); the lower part of the limiting plate (201) is fixedly connected to the limiting strip (2011), and the limiting strip (2011) is made of rubber.

6. A nondestructive testing device for a varistor according to any one of claims 1 to 5, characterized in that: The marking assembly comprises an electric slide rail (208), an electric slider (209), an electric actuator II (210) and a marking pen (211); the electric slide rail (208) is fixedly connected to the support frame (1); the electric slider (209) is slidably connected to the electric slide rail (208); the electric actuator II (210) is fixedly connected to the lower part of the electric slider (209); and the marking pen (211) is installed on the telescopic part of the electric actuator II (210).

7. A nondestructive testing device for a varistor according to claim 6, characterized in that: The entirety of the marking pen (211) is configured in a cone shape, and the entirety of the marking pen (211) is configured in an inclined shape.

8. The nondestructive testing device for varistor according to claim 7, characterized in that: It also includes a conduit (301) fixedly connected to each fixing plate (203); each conduit (301) is connected to a plurality of nozzles (302), and each nozzle (302) corresponds to a conductive spring sheet (204).

9. A nondestructive testing device for a varistor according to claim 8, characterized in that: The invention also includes a clamping and limiting system; the clamping and limiting system is connected to the support frame (1); the clamping and limiting system includes an electric actuator III (401), a connecting plate I (402), a clamping plate I (403), an electric actuator IV (404), a connecting plate II (405) and a clamping plate II (406); at least two electric actuators III (401) are fixedly connected to the support frame (1); the telescopic portion of each electric actuator III (401) is fixedly connected to a connecting plate I (402), and the connecting plate I (402 ) is made of insulating material; each connecting plate I (402) is fixedly connected to a plurality of clamping plates I (403), and the clamping plates I (403) are made of insulating material; at least two electric actuators IV (404) are fixedly connected to the support frame (1); the telescopic part of each electric actuator IV (404) is fixedly connected to a connecting plate II (405), and the connecting plate II (405) is made of insulating material; each connecting plate II (405) is fixedly connected to a plurality of clamping plates II (406), and the clamping plates II (406) are made of insulating material.

10. A nondestructive testing device for a varistor according to claim 9, characterized in that: An upwardly protruding blocking portion (4061) is provided at one end of the clamping plate II (406) away from the connecting plate II (405).

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