Intelligent packaging equipment and packaging process of piezoresistor and piezoresistor

Abstract

The application provides an intelligent packaging equipment for a pressure-sensitive resistor, a packaging process and the pressure-sensitive resistor. The intelligent packaging equipment for the pressure-sensitive resistor comprises a man-machine interface, a plurality of clamps and, sequentially arranged along the transmission direction of the clamps, a feeding rack, an oven, a packaging device and a discharging rack. The feeding rack, the oven and the discharging rack accommodate the clamps in a layered manner. The oven is provided with a constant temperature device for constant temperature adjustment of the pressure-sensitive resistor on the clamp. The packaging device comprises a packaging mechanical arm, a heat preservation box, a heating assembly and a powder tank assembly. The powder tank assembly is filled with packaging powder. The heating assembly comprises a heating door, a leveling rack and a sliding seat. The leveling rack is provided with a scraper extending into the powder tank assembly. The heat preservation box, the heating assembly and the powder tank assembly are sequentially distributed from top to bottom to make the packaging process of the pressure-sensitive resistor continuous and orderly, improve the packaging efficiency and the packaging yield, and reduce the volume of the packaging equipment and improve the space utilization.

Description

Technical Field

[0001] This invention relates to the field of varistor manufacturing, and in particular to intelligent packaging equipment, packaging process, and varistors. Background Technology

[0002] Encapsulation is one of the processes in the manufacturing of varistors. The purpose of the encapsulation process is to wrap the varistor with encapsulation material to form a protective shell, thereby protecting the varistor and ensuring its reliability and operational stability in complex environments.

[0003] The encapsulation process requires temperature control of the varistor beforehand. Once the surface temperature of the varistor is constant, it is inserted into a material bath to coat it with encapsulating material. The varistor is then transferred to an oven for heat treatment to solidify the encapsulating material onto its surface. Heating is necessary before and after encapsulation, and this heating process requires the varistor to remain stationary in the oven. For these reasons, existing varistor encapsulation equipment has the following problems:

[0004] 1. In the production process of varistor, the temperature control of varistor and the hot melt curing of packaging material are segmented processes. The temperature control and hot melt curing processes both require time to stand still in the oven. This can easily cause the varistor to be packaged to stay for a long time between the two processes. In the packaging process, manual operation exposes the varistor to the air, which leads to a decrease in the surface temperature of the varistor and uneven surface temperature, resulting in an excessive number of defective varistor packages.

[0005] 2. Storage devices or extended transport tracks are needed on the production line to accommodate the varistors to be packaged that are stuck on the production line, which increases the overall size of the packaging equipment, making the packaging equipment too bulky and taking up a lot of workshop space.

[0006] 3. The amount of encapsulation powder needs to be judged by human experience and added manually. It cannot be added accurately as needed, resulting in a large error in the amount of encapsulation powder used, which leads to an excessively high defect rate of varistors.

[0007] 4. During the packaging process, repetitive manual operations may prevent dust from being sealed off, causing dust leakage and affecting the workshop environment. Summary of the Invention

[0008] The purpose of this invention is to overcome the shortcomings of the prior art and provide an intelligent packaging device, packaging process, and varistor for varistors, which makes the packaging process of varistors coherent and orderly, improves packaging efficiency and packaging yield, improves the accuracy of packaging powder usage and avoids waste of packaging materials, avoids dust in the workshop and reduces dust pollution, making the workshop environment more environmentally friendly, and reduces the size of the packaging equipment and improves space utilization.

[0009] The objective of this invention is achieved through the following technical solution:

[0010] An intelligent packaging device for varistors includes: a human-machine interface, multiple fixtures, and a loading rack, an oven, a packaging device, and an unloading rack arranged sequentially along the conveying direction of the fixtures.

[0011] Each of the fixtures is provided with multiple clips for holding the varistor to be packaged and suspending it below the fixture. The loading rack, the drying oven, and the unloading rack all accommodate multiple fixtures in a layered manner.

[0012] The oven is equipped with a temperature control device, which is used to maintain the temperature of the varistor on the fixture. Here, temperature control refers to heating or cooling the varistor to keep its temperature at a set value.

[0013] The encapsulation device includes an encapsulation robotic arm and, from top to bottom, an insulation box, a heating assembly, and a powder tank assembly. The powder tank assembly is filled with encapsulation powder. The heating assembly includes a heating door, a leveling frame, and a sliding seat. The heating door faces the insulation box. The leveling frame is equipped with a scraper that extends into the powder tank assembly. The sliding seat is used to drive the heating door and the leveling frame to move synchronously to open or close the opening of the powder tank assembly and the opening of the insulation box, and to allow the scraper to smooth the encapsulation powder in the powder tank assembly.

[0014] The packaging robotic arm is located inside the insulation box. The packaging robotic arm is used to drive the clamp from the insulation box into the powder tank assembly and insert the varistor into the packaging powder.

[0015] In one embodiment, the packaging device further includes a feeding assembly, which includes a hopper, a conveying pipe, and a feeding screw located within the conveying pipe. The hopper is used to store packaging powder, the conveying pipe extends toward the opening side of the powder tank assembly, and the feeding screw rotates to push the packaging powder in the hopper forward along the conveying pipe.

[0016] In one embodiment, the insulated box is provided with a movable door on the side near the oven and on the side near the unloading rack.

[0017] In one embodiment, the loading rack, the drying oven, and the unloading rack are all equipped with chain drive assemblies, and the chain drive assemblies are equipped with multiple hanging plates for storing the fixtures.

[0018] In one embodiment, a pushing robot is provided between the loading rack and the oven, between the oven and the insulation box, and between the insulation box and the unloading rack. The pushing robot is used to push the clamp on the hanging plate into the next station.

[0019] In one embodiment, the outer side of the insulated box is provided with an insulated cover, and when the heating door leaves the insulated box, the insulated cover covers the heating door.

[0020] In one embodiment, the packaging robotic arm includes a lead screw drive module, a hanger, and a pressure frame swing arm. The hanger is provided with two opposing C-shaped support plates for supporting the clamp. The pressure frame swing arm is rotatably mounted on the C-shaped support plates and is used to press the clamp on the C-shaped support plates.

[0021] In one embodiment, the leveling frame is provided with an exhaust duct, and the exhaust duct has multiple exhaust ports, which are distributed at intervals along the edge of the powder tank assembly.

[0022] In one embodiment, the powder tank assembly includes an air chamber, a tank body, a filter layer, and a heating coil. The tank body is open at both ends, the air chamber is located at the bottom of the tank body, the filter layer is disposed between the air chamber and the tank body, the encapsulated powder is filled in the tank body, the heating coil is disposed in the air chamber, the air chamber is filled with a sponge, the sponge wraps around the heating coil, and the air chamber is connected to an external air pump; a weighing frame is provided at the bottom of the air chamber, the weighing frame is used to detect the weight of the encapsulated powder in the tank body.

[0023] A varistor packaging process, based on the above-mentioned intelligent packaging equipment for varistors, includes the following steps:

[0024] Step 1: Enter the control program and parameters related to the varistor to be packaged into the human-machine interface, clamp the varistor to be packaged onto the fixture, and start the control program to begin the packaging equipment operation.

[0025] Step 2: Transfer the fixture to the loading rack, and the fixture at the bottom of the loading rack enters the drying oven;

[0026] Step 3: The temperature control device heats or cools the varistors entering the oven and maintains a constant temperature.

[0027] Step 4: The varistor, after being kept at a constant temperature, is placed in an insulated box with the fixture for reheating;

[0028] Step 5: The encapsulation robotic arm drives the fixture to descend, moving it from the insulated box to the powder tank assembly, inserting the varistor into the encapsulation powder, and allowing the encapsulation powder to coat the surface of the varistor.

[0029] Step 6: The packaging robot arm returns to the insulation box with the clamp, and the sliding seat pushes the heating door and the leveling frame forward, so that the heating door moves to close the insulation box and the leveling frame closes the opening of the powder tank assembly;

[0030] Step 7: The heating door operates repeatedly to reheat the insulation box until the encapsulation powder wrapped around the surface of the varistor is thermally melted and solidified, forming an insulating layer on the surface of the varistor.

[0031] Step 8: Transfer the fixture from the insulation box to the unloading rack for temporary storage, waiting for unloading.

[0032] A varistor is prepared by the above-mentioned varistor packaging process.

[0033] In summary, the combination of the top-to-bottom arranged insulation box, heating components, and powder tank components ensures a smooth and orderly packaging process for varistors, improving packaging efficiency and yield; enhancing the accuracy of powder usage and avoiding material waste; and reducing the size of the packaging equipment, thus increasing space utilization. Attached Figure Description

[0034] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 A schematic diagram of an intelligent packaging device for varistors;

[0036] Figure 2 This is a schematic diagram of the packaging device.

[0037] Figure 3 This is a diagram of the internal structure of the packaging device;

[0038] Figure 4 This is a diagram showing the assembly status of various components within the encapsulation device during heat-melting and curing.

[0039] Figure 5 This is a diagram showing the assembly status of various components within the packaging device during the packaging process.

[0040] Figure 6 This is a structural diagram of the insulated box;

[0041] Figure 7 This is a schematic diagram of the encapsulated robotic arm.

[0042] Figure 8 This is a schematic diagram of the fixture's structure;

[0043] Figure 9 A schematic diagram showing the assembly of the heating door, leveling frame, and sliding seat;

[0044] Figure 10 This is a breakdown diagram of the heating door and leveling frame;

[0045] Figure 11 This is a schematic diagram of the powder tank assembly;

[0046] Figure 12 This is a diagram showing the internal structure of the powder tank assembly;

[0047] Figure 13 This is a schematic diagram showing the connection between the chain drive assembly and the clamp.

[0048] Figure reference numerals: 10. Intelligent packaging equipment for varistors; 11. Human-machine interface; 20. Varistor; 100. Fixture; 110. Clip; 200. Loading rack; 300. Drying oven; 310. Temperature control device; 400. Packaging device; 410. Packaging robotic arm; 411. Screw drive module; 412. Hanger; 413. Pressing frame swing rod; 414. C-shaped tray; 420. Insulation box; 421. Movable door; 422. Insulation cover; 430. Heating component; 431. Heating door; 432. Leveling frame; 433. Sliding seat; 434. Scraper; 435. Exhaust duct; 4351. Exhaust vent; 440. Powder tank assembly; 441. Air chamber; 442. Tank body; 443. Filter layer; 444. Heating coil; 445. Weighing frame; 450. Feeding assembly; 451. Hopper; 452. Conveying pipe; 453. Feeding screw; 500. Unloading frame; 600. Chain drive assembly; 610. Hanging plate; 700. Pushing robot; Detailed Implementation

[0049] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0050] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0052] Please see Figure 1 This invention provides an intelligent packaging device 10 for varistors, comprising: a human-machine interface 11, multiple fixtures 100, and a loading rack 200, an oven 300, a packaging device 400, and an unloading rack 500 arranged sequentially along the transport direction of the fixtures 100. The flow direction of the fixtures 100 is roughly as follows: after the varistor is placed on the fixture 100, it is stored in the loading rack 200. The fixture 100 is transferred from the loading rack 200 to the oven 300. The oven 300 and the constant temperature device 310 heat or cool the varistor to maintain its surface temperature at a set value in preparation for packaging. After being kept at a constant temperature, the varistor enters the packaging device 400 with the fixture 100 for packaging. Finally, the packaged varistor enters the unloading rack 500 with the fixture 100 to await unloading.

[0053] Please see Figure 1 and Figure 8 Each fixture 100 is equipped with multiple clips 110, which are used to hold the varistor 20 to be packaged and suspend it below the fixture 100. The loading rack 200, the drying oven 300 and the unloading rack 500 are all arranged in layers to accommodate multiple fixtures 100. That is, the loading rack 200, the drying oven 300 and the unloading rack 500 can all accommodate multiple fixtures 100, and each fixture 100 in the loading rack 200, the drying oven 300 or the unloading rack 500 is stored in layers, thereby increasing the number of fixtures 100 that can be accommodated and improving space utilization.

[0054] Please see Figure 1 The oven 300 is equipped with a temperature control device 310, which is used to heat or cool the varistor 20 on the fixture 100 so that the temperature of the varistor is maintained at the set value.

[0055] Please see Figure 2and Figure 3 The packaging device 400 includes a packaging robotic arm 410 and, from top to bottom, an insulation box 420, a heating component 430, and a powder tank component 440, the powder tank component 440 being filled with packaging powder.

[0056] Please see Figure 4 , Figure 9 and Figure 10 The heating assembly 430 includes a heating door 431, a leveling frame 432, and a sliding seat 433. The heating door 431 faces the heat preservation box 420. The leveling frame 432 is provided with a scraper 434, which extends into the powder trough assembly 440. The sliding seat 433 is used to drive the heating door 431 and the leveling frame 432 to move synchronously to open or close the opening of the powder trough assembly 440 and the opening of the heat preservation box 420, and to make the scraper 434 smooth the encapsulated powder in the powder trough assembly 440.

[0057] Please see Figure 4 and Figure 7 The packaging robot arm 410 is located inside the insulation box 420. The packaging robot arm 410 is used to drive the clamp 100 from the insulation box 420 into the powder tank assembly 440 and insert the varistor into the packaging powder.

[0058] This application also provides a varistor packaging process, based on the intelligent packaging equipment 10 for the varistor described above, including the following steps:

[0059] Step 1: Input the control program and parameters related to the varistor to be packaged into the human-machine interface 11, and clamp the varistor to be packaged onto the fixture 100; start the control program and the packaging equipment 10 starts working. The data of the equipment operation can be displayed through the touch screen of the human-machine interface 11, and the worker can set and adjust the packaging-related parameters such as the constant temperature of the constant temperature device 310 and the heating temperature of the heating door 431 through the touch screen of the human-machine interface 11.

[0060] Step 2: Transfer the fixture 100 to the loading rack 200. The worker places the fixture 100, which holds the varistor 20, into the loading rack 200. When the equipment starts, the bottommost fixture 100 in the loading rack 200 enters the drying oven 300. For example... Figure 1 As shown, a pushing robot 700 is provided between the loading rack 200 and the oven 300. The pushing robot 700 sends the bottom clamp 100 into the oven 300. The speed at which the clamp 100 enters the oven 300 is related to the speed at which the packaging device 400 packages the varistor 20. When a clamp 100 enters the packaging device 400 for the packaging process, the clamp 100 in the loading rack 200 is sent into the oven 300.

[0061] Step 3: The temperature control device 310 heats or cools the varistor entering the oven 300 and maintains a constant temperature.

[0062] Step 4: The temperature-controlled varistor enters the packaging device 400 along with the fixture 100;

[0063] Step 5: The packaging robot arm 410 drives the clamp 100 to descend, moving it from the heat preservation box 420 to the powder tank assembly 440, inserting the varistor into the packaging powder, so that the packaging powder coats the surface of the varistor.

[0064] Step 6: The packaging robot arm 410 returns to the insulation box 420 with the clamp 100, and the sliding seat 433 pushes the heating door 431 and the leveling frame 432 forward, so that the heating door 431 moves to the bottom of the insulation box 420 and the leveling frame 432 closes the opening of the powder tank assembly 440.

[0065] Step 7: The heating door 431 operates repeatedly to reheat the insulation box 420 until the encapsulation powder wrapped around the surface of the varistor is thermally melted and solidified, forming an insulating layer on the surface of the varistor.

[0066] Step 8: Transfer the fixture 100 from the insulation box 420 to the unloading rack 500 for temporary storage, waiting for unloading.

[0067] The working principle of the intelligent packaging equipment 10 for the above-mentioned varistors is as follows:

[0068] The varistor 20 is clamped onto the clip 110, with the varistor 20 suspended below the clip 100 as follows: Figure 8 As shown, the clamp 100 is then stored in the loading rack 200;

[0069] When the equipment is started, the clamp 100 located at the bottom of the loading rack 200 is pushed into the oven 300. The constant temperature device 310 in the oven 300 heats or cools the equipment to adjust the temperature of the varistor 20 and keep it at the set value. The clamp 100 located at the top of the oven 300 is pushed into the packaging device 400 for packaging operation.

[0070] The clamp 100 entering the packaging device 400 is caught by the packaging robot arm 410. In the packaging device 400, the heat preservation box 420, the heating component 430 and the powder tank component 440 are distributed in order from top to bottom. That is, at this time, the clamp 100 is located inside the heat preservation box 420, and the heating door 431 faces the heat preservation box 420, which can maintain the surface temperature of the varistor 20.

[0071] Please see Figure 4 and Figure 5During the encapsulation operation, the sliding seat 433 drives the heating door 431 and the leveling frame 432 to move synchronously, causing the leveling frame 432 to be misaligned with the powder tank assembly 440, opening the opening of the powder tank assembly 440. The heating door 431 moves away from below the insulation box 420. At this time, both the bottom of the insulation box 420 and the opening of the powder tank assembly 440 are closed. The encapsulation robotic arm 410 descends with the clamp 100, transferring the clamp 100 from inside the insulation box 420 into the powder tank assembly 440, inserting the varistor 20 into the encapsulation powder. Figure 5 As shown, the encapsulation powder is applied to the portion of the varistor 20 to be encapsulated; after the encapsulation powder coats the varistor 20, the encapsulation robotic arm 410 resets, causing the clamp 100 to return to the insulation box 420, and the sliding seat 433 drives the heating door 431 and the leveling frame 432 to reset, as shown. Figure 4 As shown, the heating door 431 heats the insulation box 420, causing the encapsulation powder adhering to the varistor 20 to be thermally melted and cured to form an insulating layer; finally, the varistor 20, which has completed thermal melting and curing, enters the unloading rack 500 with the fixture 100 to wait for unloading.

[0072] When the sliding seat 433 drives the heating door 431 and the leveling frame 432 to move synchronously, the scraper 434 on the leveling frame 432 moves from one end of the powder trough assembly 440 to the other end, its position changing from... Figure 4 The position change shown is Figure 5 As shown, the scraper 434 can level the encapsulation powder during its translational movement inside the powder tank assembly 440, ensuring that the varistor 20 is in a flat state before being coated with powder. This ensures that the part of the varistor 20 to be encapsulated can be completely covered by the encapsulation powder after entering the powder tank assembly 440.

[0073] It should be emphasized that the insulation box 420, heating component 430 and powder tank component 440 in the packaging device 400 are arranged in a top-to-bottom order. The packaging robot arm 410 drives the clamp 100 to descend into the powder tank component 440, so that the packaging powder coats the varistor 20 and then immediately returns to the insulation box 420 for heat melting and curing without waiting. This improves the packaging efficiency and avoids the packaging powder from falling off the surface of the varistor 20 due to waiting after powder coating, which would result in an incomplete insulation layer after curing. This improves the stability of the packaging process.

[0074] As can be seen from the above, the intelligent packaging equipment 10 for varistors has the following beneficial effects:

[0075] 1. The fixture 100 is stored in layers in the loading rack 200, drying oven 300 and unloading rack 500, which increases the number of fixtures 100 that can be stored per unit area, which helps to reduce the overall size of the equipment and improve the space utilization of the equipment. At the same time, it can avoid the product being stuck while waiting for the packaging powder to be hot melted and cured, which affects the normal operation of other processes. It also solves the problem of high varistor packaging failure rate caused by uneven temperature and large packaging temperature difference during the product retention process.

[0076] 2. An oven 300 and a constant temperature device 310 are configured to heat or cool the varistor to be packaged and then maintain the temperature. The varistor is brought to a constant temperature state before it enters the packaging position, which reduces the temperature adjustment time during the packaging process, thereby improving the packaging efficiency and the packaging yield.

[0077] 3. The insulation box 420 and the powder tank assembly 440 are integrated into the same equipment. After the varistor is wrapped with the encapsulation powder, it is returned to the insulation box 420 for heat melting and curing. This makes the process of the varistor wrapping the encapsulation powder and the heat melting and curing process closely connected. The encapsulation powder is immediately heat-melted and cured after wrapping the varistor without waiting. This reduces the size of the equipment and also prevents the encapsulation powder from falling off due to failure to heat melt and cure in time, which would lead to poor encapsulation.

[0078] 4. The packaging process of the varistor is completed inside the packaging device 400 without manual operation, which can prevent dust leakage, avoid affecting the workshop environment, and reduce environmental pollution.

[0079] Please see Figure 2 and Figure 4 In one embodiment, the packaging device 400 further includes a feeding assembly 450, which includes a hopper 451, a conveying pipe 452, and a feeding screw 453 located within the conveying pipe 452. The hopper 451 is used to store packaging powder. The conveying pipe 452 extends toward the opening side of the powder tank assembly 440. Rotation of the feeding screw 453 can push the packaging powder in the hopper 451 forward along the conveying pipe 452, transferring the packaging powder from the hopper 451 to the powder tank assembly 440. The feeding amount of packaging powder is controlled by the feeding screw 453 to achieve quantitative feeding. The amount of encapsulating powder in the powder tank assembly 440 is kept constant, and the depth of the encapsulating powder in the powder tank assembly 440 is maintained at a relatively stable height. After the encapsulation robot arm 410 drives the clamp 100 to descend, it ensures that the part to be encapsulated on the varistor 20 can be completely inserted into the encapsulating powder. This ensures that the part to be encapsulated on the varistor 20 can be stably adhered with a sufficient amount of encapsulating powder. The amount of encapsulating powder does not need to be judged by human experience. It can be accurately added according to the needs, which helps to reduce encapsulation defects caused by improper encapsulating powder and avoid waste.

[0080] Please see Figure 3and Figure 6 In one embodiment, the insulation box 420 is provided with a movable door 421 on the side near the drying oven 300 and on the side near the unloading rack 500. In this way, when the clamp 100 enters or leaves the insulation box 420, the movable door 421 at the corresponding position can be opened and closed after the entry or exit action is completed, so that the insulation box 420 is in a relatively sealed state, avoiding heat leakage that would prolong the packaging time and reduce the packaging efficiency.

[0081] Please see Figure 13 In one embodiment, the loading rack 200, the drying oven 300, and the unloading rack 500 are all equipped with chain drive assemblies 600. The chain drive assemblies 600 are equipped with multiple hanging plates 610 for storing fixtures 100. This allows the fixtures 100 in the loading rack 200, the drying oven 300, and the unloading rack 500 to be stored in layers. When the chain drive assembly 600 is started, the multiple layers of fixtures 100 can be raised or lowered simultaneously, thereby moving the top or bottom layer of fixtures 100 to the position to be transferred.

[0082] Please see Figure 1 Pushing robots 700 are installed between the loading rack 200 and the oven 300, between the oven 300 and the insulation box 420, and between the insulation box 420 and the unloading rack 500. The pushing robots 700 are used to push the clamps 100 on the hanging plate 610 located at the transfer position into the next process. Based on the working principle of the intelligent packaging equipment 10 for varistors, if the pushed clamps 100 are located in the loading rack 200, then the "next station" here refers to the oven 300; if the pushed clamps 100 are located in the oven 300, then the "next station" here refers to the insulation box 420, and so on.

[0083] Please see Figure 5 and Figure 6 In one embodiment, an insulation cover 422 is provided on the outside of the insulation box 420. When the opening of the powder tank assembly 440 is open, the insulation cover 422 covers the heating door 431. The insulation cover 422 only functions when the packaging robot arm 410 drives the varistor 20 to pick up powder. Specifically, when the varistor 20 picks up powder, the sliding seat 433 moves the heating door 431 and the leveling frame 432 away. At this time, the heating door 431 will move under the insulation cover 422. Figure 5 As shown, the heating door 431 is covered by the heat insulation cover 422 to prevent the heat on the heating door 431 from dissipating outward during the powder coating process. On the one hand, this avoids heat loss, which would lead to a longer heat melting and curing time later. On the other hand, it also protects the surrounding accessories and prevents the overflowing heat from affecting the normal operation of the external accessories.

[0084] Please see Figure 3 and Figure 7In one embodiment, the packaging robotic arm 410 includes a lead screw drive module 411, a hanger 412, and a pressure frame swing arm 413. The hanger 412 is provided with two opposing C-shaped support plates 414 for supporting the clamp 100. The pressure frame swing arm 413 is rotatably mounted on the C-shaped support plates 414 and is used to press the clamp 100 on the C-shaped support plates 414. The support for the clamp 100 is provided by the curved position on the C-shaped tray 414. The two ends of the support structure formed by the C-shaped tray 414 are unobstructed, so the pusher robot 700 can push the clamp 100 to move horizontally, thereby allowing the clamp 100 to enter and exit the insulation box 420. The pressure frame swing rod 413 provided on the C-shaped tray 414 provides pressure to press the clamp 100 on the C-shaped tray 414, providing pressure to prevent the clamp 100 from jumping or shifting due to the reaction force generated when the varistor 20 is inserted into the packaging powder.

[0085] Please see Figure 9 and Figure 10 In one embodiment, the leveling frame 432 is equipped with an exhaust duct 435 and a temporary storage box (not shown) connected to the exhaust duct 435. Multiple exhaust ports 4351 are provided on the exhaust duct 435, and these ports are spaced apart along the edge of the powder tank assembly 440. As can be seen from the working principle of the intelligent packaging equipment 10 for varistors, the packaging material is powder. Therefore, the insertion and removal of the varistor 20 will cause some packaging powder to be stirred up. To prevent the scattered powder, the leveling frame 432 is equipped with an exhaust duct 435, and the exhaust ports 4351 on it are spaced apart along the edge of the powder tank assembly 440. The exhaust duct 435 sucks up the stirred-up packaging powder and guides it into the temporary storage box, preventing it from escaping outside the equipment. The packaging powder stored in the temporary storage box is added to the hopper 451 in batches on the same day for continued use, avoiding waste of packaging powder. The exhaust duct 435 is located on the leveling frame 432 and is spaced apart from the powder tank assembly 440. The exhaust duct 435 has a weak airflow and is only used to remove the packaging powder that is lifted into the air due to the packaging action. This ensures that no powder tank that is scattered in the air will float out and pollute the workshop environment after the equipment protective door is opened, thus improving the environmental protection level of the workshop.

[0086] Please see Figure 11 and Figure 12In one embodiment, the powder tank assembly 440 includes an air chamber 441, a tank body 442, a filter layer 443, and a heating coil 444. The tank body 442 is open at both ends. The air chamber 441 is located at the bottom of the tank body 442. The filter layer 443 is disposed between the air chamber 441 and the tank body 442. Encapsulating powder is filled inside the tank body 442. The heating coil 444 is disposed in the air chamber 441, which is filled with a sponge that wraps around the heating coil 444. The air chamber 441 is connected to an external air pump. A weighing frame 445 is provided at the bottom of the air chamber 441 for detecting the weight of the encapsulating powder inside the tank body 442. The effects of the powder tank assembly 440 are as follows:

[0087] The air chamber 441 is connected to an external air pump. Air is pumped into the air chamber 441, causing the air to flow towards the tank 442. The air entering the air chamber 441 is heated by the heating coil 444 to form hot air. This hot air heats the encapsulation powder inside the tank 442, thereby regulating the temperature of the encapsulation powder and ensuring it is in a state that easily adheres to the varistor 20. It should be noted that the air must pass through a sponge and filter layer 443 during its journey from the air chamber 441 into the tank 442. This filters out moisture, oil droplets, and other contaminants from the air, preventing the encapsulation powder from becoming damp and clumping together.

[0088] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. An intelligent packaging device for a varistor, characterized in that, include: Human-machine interface, multiple fixtures, and loading rack, drying oven, packaging device, and unloading rack arranged sequentially along the conveying direction of the fixtures; Each of the fixtures is provided with multiple clips for holding the varistor to be packaged and suspending it below the fixture. The loading rack, the drying oven, and the unloading rack all accommodate multiple fixtures in a layered manner. The oven is equipped with a temperature control device, which is used to maintain the temperature of the varistor on the fixture. The encapsulation device includes an encapsulation robotic arm and, from top to bottom, an insulation box, a heating assembly, and a powder tank assembly. The powder tank assembly is filled with encapsulation powder. The heating assembly includes a heating door, a leveling frame, and a sliding seat. The heating door faces the insulation box. The leveling frame is equipped with a scraper that extends into the powder tank assembly. The sliding seat is used to drive the heating door and the leveling frame to move synchronously to open or close the opening of the powder tank assembly and the opening of the insulation box, and to allow the scraper to smooth the encapsulation powder in the powder tank assembly. The packaging robotic arm is located inside the insulated box. The packaging robotic arm is used to drive the clamp from the insulated box into the powder tank assembly and insert the varistor into the packaging powder. The packaging device further includes a feeding assembly, which includes a hopper, a conveying pipe, and a feeding screw located inside the conveying pipe. The hopper is used to store packaging powder, the conveying pipe extends toward the opening side of the powder tank assembly, and the feeding screw rotates to push the packaging powder in the hopper forward along the conveying pipe. The powder tank assembly includes an air chamber, a tank body, a filter layer, and a heating coil. The tank body is open at both ends. The air chamber is located at the bottom of the tank body. The filter layer is disposed between the air chamber and the tank body. The encapsulated powder is filled in the tank body. The heating coil is disposed in the air chamber. The air chamber is filled with a sponge, which wraps around the heating coil. The air chamber is connected to an external air pump. A weighing frame is provided at the bottom of the air chamber for detecting the weight of the encapsulated powder in the tank body.

2. The intelligent packaging equipment for varistors according to claim 1, characterized in that, The insulated box has a movable door on the side near the drying oven and another on the side near the unloading rack.

3. The intelligent packaging equipment for varistors according to claim 1, characterized in that, The loading rack, the drying oven, and the unloading rack are all equipped with chain drive assemblies. The chain drive assemblies are equipped with multiple hanging plates, which are used to store the clamps. Pushing robots are provided between the loading rack and the drying oven, between the drying oven and the insulation box, and between the insulation box and the unloading rack. The pushing robots are used to push the clamps on the hanging plate into the next station.

4. The intelligent packaging equipment for varistors according to claim 1, characterized in that, The outer side of the insulated box is provided with an insulated cover, and when the heating door leaves the insulated box, the insulated cover covers the heating door.

5. The intelligent packaging equipment for varistors according to claim 1, characterized in that, The packaging robotic arm includes a lead screw drive module, a hanger, and a pressure frame swing arm. The hanger is provided with two opposing C-shaped support plates, which are used to support the clamp. The pressure frame swing arm is rotatably mounted on the C-shaped support plates and is used to press the clamp on the C-shaped support plates.

6. The intelligent packaging equipment for varistors according to claim 1, characterized in that, The leveling frame is equipped with an exhaust duct, and the exhaust duct has multiple exhaust ports, which are distributed at intervals along the edge of the powder tank assembly.

7. A varistor packaging process, based on an intelligent packaging device for the varistor according to any one of claims 1 to 6, characterized in that, Includes the following steps: Step 1: Enter the control program and parameters related to the varistor to be packaged into the human-machine interface, clamp the varistor to be packaged onto the fixture, and start the control program to begin the packaging equipment operation. Step 2: Transfer the fixture to the loading rack, and the fixture at the bottom of the loading rack enters the drying oven; Step 3: The temperature control device heats or cools the varistors entering the oven and maintains a constant temperature. Step 4: The varistor, after being kept at a constant temperature, is placed in an insulated box with the fixture for reheating; Step 5: The encapsulation robotic arm drives the fixture to descend, moving it from the insulated box to the powder tank assembly, inserting the varistor into the encapsulation powder, and allowing the encapsulation powder to coat the surface of the varistor. Step 6: The packaging robot arm returns to the insulation box with the clamp, and the sliding seat pushes the heating door and leveling frame forward, so that the heating door closes the insulation box and the leveling frame closes the opening of the powder tank assembly; Step 7: The heating door operates repeatedly to reheat the insulation box until the encapsulation powder wrapped around the surface of the varistor is thermally melted and solidified, forming an insulating layer on the surface of the varistor. Step 8: Transfer the fixture from the insulation box to the unloading rack for temporary storage, waiting for unloading.

8. A varistor, characterized in that, It is prepared by the varistor packaging process described in claim 7.

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