Automatic coating equipment for piezoresistor

Abstract

The automatic coating equipment comprises a base, a coating box is fixedly connected to the upper end of the base, fixing plates are fixedly connected to the two ends of the inner side of the coating box, rotating shafts are rotatably connected to the interiors of the fixing plates, rotating rings are fixedly connected to the inner ends of the rotating shafts, and the rotating rings are fixedly connected to the inner ends of the rotating shafts. The inner side of the rotating ring is fixedly connected with a plurality of sets of positioning plates, the interior of the positioning plate at the upper end is in threaded connection with a screw rod, the rotating ring is installed in the coating box, the positioning plates, the screw rod and a pressing plate are arranged in the rotating ring, two pins of a piezoresistor can be positioned and clamped, and therefore the two pins of the piezoresistor can be fixed and clamped. According to the coating device for the varistor, the coating stability of the varistor is guaranteed, the whole coating device can conduct coating operation on a plurality of varistors at a time, the coating efficiency of the varistor is improved, then rotation of the varistors can be achieved under the action of the gear assembly, and therefore the uniform coating effect is achieved.

Description

Technical Field

[0001] This utility model relates to the field of varistor spraying technology, and in particular to an automatic coating device for varistors. Background Technology

[0002] A varistor is an electronic component with nonlinear current-voltage characteristics. Its main components are metal oxides such as zinc oxide. Its resistance changes significantly with the applied voltage. When an overvoltage occurs in the circuit, it can quickly conduct and shunt current to protect the equipment. The coating process is a crucial step in applying an insulating protective layer (such as epoxy resin or silicone) to its surface. This aims to isolate it from moisture, dust, and chemical corrosion in the environment, preventing moisture absorption that could lead to performance degradation or increased leakage current. It also enhances mechanical strength to avoid physical damage during transportation and use. The coating layer also improves surface insulation, ensuring no arcing occurs under high voltage, and maintains stable voltage response characteristics through uniform coating thickness.

[0003] In existing technologies, varistor coating mainly relies on manual operation. Operators need to hold the resistors one by one and dip or brush them to coat them. Only one component can be processed at a time, resulting in low production efficiency (less than 1,000 pieces per person per day). Furthermore, manual operation is prone to uneven coating thickness, causing fluctuations in insulation performance or local defects. At the same time, excessive sprayed liquid is directly discarded during the coating process, resulting in a material utilization rate of less than 40%. High-value functional coatings are wasted in a serious manner, which leads to increased production costs, poor quality stability, and low resource sustainability. Utility Model Content

[0004] The purpose of this invention is to provide an automatic coating device for varistors, which solves the problems of existing technology where varistor coating mainly relies on manual operation, which is time-consuming and labor-intensive, and excessive sprayed liquid is directly discarded, resulting in a material utilization rate of less than 40% and serious waste of high-value functional coatings.

[0005] To achieve the above objectives, an automatic coating device for varistors is provided, comprising a base, a coating box fixedly connected to the upper end of the base, a fixing plate fixedly connected to both ends of the inner side of the coating box, a rotating shaft rotatably connected inside the fixing plate, a rotating ring fixedly connected to the inner end of the rotating shaft, a plurality of positioning plates fixedly connected to the inner side of the rotating ring, and a screw threadedly connected to the inner end of the positioning plate.

[0006] The lower end of the screw is rotatably connected to a pressure plate, and the lower end of the pressure plate is fixedly connected to a buffer pad. The outer end of the positioning plate on the left is fixedly connected to a drive box, and the rotating shaft on the left passes through the drive box and is fixedly connected to a gear two.

[0007] According to the automatic coating equipment for varistor, a liquid storage tank is fixedly connected to the other end of the base, and a delivery pipe is provided through the upper end of the liquid storage tank.

[0008] According to the automatic coating equipment for varistor, a delivery pump is provided in the middle of the delivery pipe, and a liquid storage plate is provided at the other end of the delivery pipe through the coating box. Several nozzles are provided at the lower end of the liquid storage plate.

[0009] According to the automatic coating equipment for a varistor, a drain port is provided through the bottom of the inner end of the coating box, and a filter screen is installed inside the drain port.

[0010] According to the automatic coating equipment for a varistor, a collection box is installed through the lower end of the drain port, and a return pipe is installed through the inside of the collection box.

[0011] According to the automatic coating equipment for a varistor, one end of the reflux pipe is disposed above the other end of the liquid storage tank, and a reflux pump is provided in the middle of the reflux pipe.

[0012] According to the automatic coating equipment for varistor, the coating box has a door hinged to its outer side, and the door has a viewing window.

[0013] The above-mentioned solution has the following beneficial effects:

[0014] 1. This patent installs a rotating ring inside the coating box, and the rotating ring is equipped with a positioning plate, screw and pressure plate, which can position and clamp the two pins of the varistor to ensure the stability of the varistor during coating. This allows the entire coating device to coat multiple resistors at one time, improving its coating efficiency. Secondly, the rotation of the resistor can be achieved by the gear assembly, thereby achieving a uniform coating effect.

[0015] 2. This patent allows for the filtration of the coating solution after coating by installing a filter screen at the drain port of the coating tank. The solution can then be returned to the storage tank via a return pipe and a return pump, reducing the overall coating cost and preventing waste.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0018] Figure 1 This is a front view of an automatic coating device for varistor according to the present invention;

[0019] Figure 2 This is a cross-sectional view of an automatic coating device for varistor according to the present invention;

[0020] Figure 3 This is a schematic diagram of the rotating ring structure of an automatic coating device for varistor according to the present invention;

[0021] Figure 4 This is a schematic diagram of the gear assembly of an automatic coating device for varistor according to the present invention.

[0022] Legend:

[0023] 1. Coating box; 2. Box door; 3. Viewing window; 4. Base; 5. Collection box; 6. Return pipe; 7. Return pump; 8. Storage tank; 9. Transfer pump; 10. Transfer pipe; 11. Nozzle; 12. Liquid storage plate; 13. Rotary ring; 14. Drive box; 15. Fixing plate; 16. Filter screen; 17. Drain port; 18. Rotating shaft; 19. Screw; 20. Positioning plate; 21. Pressure plate; 22. Motor; 23. Gear 1; 24. Gear 2. Detailed Implementation

[0024] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0025] Reference Figure 1-4 This utility model provides an automatic coating device for varistors, including a base 4. A coating box 1 is fixedly connected to the upper end of the base 4. Fixing plates 15 are fixedly connected to both ends of the inner side of the coating box 1. A rotating shaft 18 is rotatably connected inside the fixing plate 15. A rotating ring 13 is fixedly connected to the inner end of the rotating shaft 18. Several sets of positioning plates 20 are fixedly connected to the inner side of the rotating ring 13. A screw 19 is threadedly connected inside the upper positioning plate 20. The design of the rotating ring 13 and the positioning components can conveniently fix multiple varistors at one time, improving the coating effect of the entire coating device.

[0026] The lower end of the screw 19 is rotatably connected to the pressure plate 21, and the lower end of the pressure plate 21 is fixedly connected to the buffer pad. The outer end of the left positioning plate 20 is fixedly connected to the drive box 14. The left rotating shaft 18 passes through the drive box 14 and is fixedly connected to the gear 24. Rotating the screw 19 drives the pressure plate 21 to move downward. The pressure plate 21 can press the two pins of the varistor to ensure the stability of the varistor during coating. Secondly, the rubber buffer pad at the bottom can prevent damage to the pins during the pressing process and improve its protection capability.

[0027] A motor 22 is fixedly connected to the bottom inner side of the drive box 14. A gear 23 is fixedly connected to the output end of the motor 22. Gear 23 meshes with gear 24. When the motor 22 is started, it drives gear 23 to rotate. Under the meshing action, it drives gear 24, shaft 18, and ring 13 to rotate, thus completing the rotation coating of the varistor and improving the uniform coating of the varistor.

[0028] A liquid storage tank 8 is fixedly connected to the other end of the base 4. A delivery pipe 10 is installed through the upper end of the liquid storage tank 8. A delivery pump 9 is installed in the middle of the delivery pipe 10. The other end of the delivery pipe 10 is installed through the coating box 1 and a liquid storage plate 12 is installed inside. Several nozzles 11 are installed at the lower end of the liquid storage plate 12. When the delivery pump 9 is started, the coating liquid inside the liquid storage tank 8 is delivered to the liquid storage plate 12 through the delivery pipe 10 and sprayed downward through the nozzles 11 to complete the coating operation on the varistor. The liquid storage plate 12 and the nozzles 11 are configured to cooperate with the rotating ring 13 below. The nozzles 11 are also arranged in a circular ring to ensure the uniformity of the coating.

[0029] A drain port 17 is provided through the bottom of the inner end of the coating tank 1. A filter screen 16 is installed inside the drain port 17. A collection tank 5 is installed through the lower end of the drain port 17. A return pipe 6 is provided through the inside of the collection tank 5. The other end of the return pipe 6 is provided above the storage tank 8. A return pump 7 is provided in the middle of the return pipe 6. A door 2 is hinged to the outside of the coating tank 1. A viewing window 3 is provided on the door 2. The coating liquid after coating can pass through the filter screen 16 and enter the collection tank 5. Then, the return pump 7 is started to collect the liquid in the collection tank. The coating solution in step 5 is returned to the storage tank 8 through the return pipe 6 to achieve recycling. The filter screen 16 can filter impurities in the coating solution to avoid impurities affecting the coating effect. The filter screen 16 can also be cleaned regularly by the staff during subsequent use. The collection box 5 below has a door at the rear end, which can also be cleaned regularly. The transfer pump 9 in this device is a high-precision peristaltic pump: model: Lange L100-2J (chemical corrosion resistant type), while the return pump 7 is a self-priming diaphragm pump: model: Yamada NDP-25 (PTFE diaphragm type).

[0030] Working principle: During use, the operator places the pins of the varistor to be coated between the two positioning plates 20, and then turns the screw 19 to drive the pressure plate 21 downward. The pressure plate 21 can position and clamp the pins of the varistor to ensure the stability of the varistor during coating. Then, the box door 2 is closed and the delivery pump 9 is started, so that the coating liquid inside the storage tank 8 is delivered to the storage plate 12 through the delivery pipe 10 and sprayed downward through the nozzle 11 to complete the coating operation of the varistor. Then, the motor 22 is started to drive the gear 1 23 to rotate. Under the meshing action, the gear 2 24, the rotating shaft 18, and the rotating ring 13 are rotated to complete the rotational coating of the varistor and improve the uniform coating of the varistor. The coating liquid remaining after coating can be filtered through the filter screen 16 and enter the collection box 5. Then, the return pump 7 is started to send the coating liquid in the collection box 5 back to the storage tank 8 through the return pipe 6 to achieve the effect of recycling.

[0031] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. An automatic coating device for varistors, comprising a base (4), characterized in that, The upper end of the base (4) is fixedly connected to a coating box (1), and the two inner ends of the coating box (1) are fixedly connected to a fixing plate (15). The inside of the fixing plate (15) is rotatably connected to a rotating shaft (18), and the inner end of the rotating shaft (18) is fixedly connected to a rotating ring (13). The inner side of the rotating ring (13) is fixedly connected to several sets of positioning plates (20), and the upper end of the positioning plate (20) is threadedly connected to a screw (19). The lower end of the screw (19) is rotatably connected to a pressure plate (21), and the lower end of the pressure plate (21) is fixedly connected to a buffer pad. The outer end of the positioning plate (20) on the left side is fixedly connected to a drive box (14), and the rotating shaft (18) on the left side passes through the drive box (14) and is fixedly connected to a gear (24).

2. The automatic coating equipment for a varistor according to claim 1, characterized in that, A motor (22) is fixedly connected to the bottom inner side of the drive box (14), and a gear (23) is fixedly connected to the output end of the motor (22). The gear (23) meshes with the gear (24).

3. The automatic coating equipment for a varistor according to claim 1, characterized in that, A liquid storage tank (8) is fixedly connected to the other end of the base (4), and a delivery pipe (10) is provided through the upper end of the liquid storage tank (8).

4. The automatic coating equipment for a varistor according to claim 3, characterized in that, A delivery pump (9) is provided in the middle of the delivery pipe (10), and a liquid storage plate (12) is provided inward through the coating box (1) at the other end of the delivery pipe (10). Several nozzles (11) are provided at the lower end of the liquid storage plate (12).

5. The automatic coating equipment for a varistor according to claim 1, characterized in that, The bottom of the inner end of the coating box (1) is provided with a drain port (17), and a filter screen (16) is installed inside the drain port (17).

6. The automatic coating equipment for a varistor according to claim 5, characterized in that, A collection box (5) is installed through the lower end of the drain port (17), and a return pipe (6) is installed through the inside of the collection box (5).

7. The automatic coating equipment for a varistor according to claim 6, characterized in that, The other end of the reflux pipe (6) is disposed above the other end of the liquid storage tank (8), and a reflux pump (7) is provided in the middle of the reflux pipe (6).

8. The automatic coating equipment for a varistor according to claim 1, characterized in that, The coating box (1) is hinged to the outside of a door (2), and the door (2) is provided with a viewing window (3).

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