Intelligent packaging equipment and packaging process of piezoresistor and piezoresistor

Abstract

The invention provides intelligent packaging equipment of a piezoresistor, a packaging process and the piezoresistor. The intelligent packaging equipment of the piezoresistor comprises a human-computer interface, a plurality of clamps, and a feeding frame, a drying oven, a packaging device and a discharging frame which are sequentially arranged in the conveying direction of the clamps. The feeding frame, the drying oven and the discharging frame contain the clamps in a layered mode. A constant-temperature device is arranged in the drying oven and is used for carrying out constant-temperature adjustment on the piezoresistor on the clamp; the packaging device comprises a packaging mechanical arm, a heat preservation box, a heating assembly and a powder groove assembly, the powder groove assembly is filled with packaging powder, the heating assembly comprises a heating door, a leveling frame and a sliding base, and a scraper is arranged on the leveling frame and extends into the powder groove assembly. Through cooperation of the heat preservation box, the heating assembly and the powder groove assembly which are sequentially distributed from top to bottom, the packaging process of the piezoresistor is coherent and ordered, the packaging efficiency is improved, and the packaging yield is increased; moreover, the size of packaging equipment is reduced, and the space utilization rate is improved.

Description

Technical Field

[0001] The present invention relates to the field of varistor production, and in particular to intelligent packaging equipment, packaging technology and varistor for varistor. Background Art

[0002] Packaging is one of the processes in the varistor manufacturing process. The purpose of the packaging process is to wrap the varistor with packaging materials to form a protective shell, thereby providing protection for the varistor and ensuring its reliability and working stability in complex environments.

[0003] The specific implementation process of the packaging process requires constant temperature management of the varistor first, inserting it into the material tank after the surface temperature of the varistor is constant, so that the packaging material is wrapped on the varistor, and then transferring the varistor to the oven for hot melting operation to solidify the packaging material on the surface of the varistor. The varistor needs to be heated before and after coating the packaging material, and the heating process requires the varistor to stand still in the oven. Based on the above reasons, the existing varistor packaging equipment has the following problems:

[0004] 1. The constant temperature management of varistors and hot melt curing of packaging materials in the production process of varistors are segmented processes. The constant temperature management and hot melt curing processes require time to stay in the oven, which can easily cause the varistors to be packaged to stay for a long time between the previous and next processes. In addition, manual operation during the packaging process exposes the varistors to the air, resulting in a decrease in the surface temperature of the varistors and uneven surface temperature, which leads to an excessively high number of defective varistor packages.

[0005] 2. It is necessary to provide a storage device on the assembly line or extend the transmission track to store the varistors to be packaged that are stranded on the assembly line, which increases the overall volume of the packaging equipment, making the packaging equipment too bloated and occupying a large space in the workshop;

[0006] 3. The packaging powder needs to be manually judged by experience. The packaging powder is added manually and cannot be added accurately as needed, resulting in a large error in the amount of packaging powder, which leads to a high defective rate of varistor packaging;

[0007] 4. Due to repeated manual operations during the packaging process, dust removal cannot be closed, causing dust leakage and affecting the workshop environment. Summary of the invention

[0008] The object of the present invention is to overcome the deficiencies in the prior art and provide an intelligent packaging device, a packaging process and a varistor for the varistor, so that the packaging process of the varistor is coherent and orderly, the packaging efficiency is improved, and the packaging yield is increased; the use accuracy of the packaging powder is improved, and the waste of packaging materials is avoided; the powder dust in the workshop is avoided, the dust pollution is reduced, and the workshop environment is made more environmentally friendly; and the volume of the packaging device is reduced, and the space utilization rate is improved.

[0009] The object of the present invention is achieved by the following technical solutions:

[0010] An intelligent packaging device for a varistor, which includes: a human-machine interface, a plurality of jigs, and a loading rack, an oven, a packaging device, and an unloading rack sequentially arranged along the transmission direction of the jigs;

[0011] Each of the jigs is provided with a plurality of clips, and the clips are used to hold the varistor to be packaged and suspend it below the jig. The loading rack, the oven and the unloading rack all accommodate a plurality of the jigs in a layered manner;

[0012] A constant temperature device is provided in the oven, and the constant temperature device is used for constant temperature management of the varistor on the jig. Here, the constant temperature management refers to heating or cooling the varistor to keep the temperature of the varistor at a set value;

[0013] The packaging device includes a packaging robotic arm and a heat preservation box, a heating component and a powder tank component sequentially distributed from top to bottom. The powder tank component is filled with packaging powder. The heating component includes a heating door, a leveling frame and a sliding seat. The heating door faces the heat preservation box. A scraper is provided on the leveling frame, and the scraper extends into the powder tank component. The sliding seat is used to drive the heating door and the leveling frame to translate synchronously to open or close the opening of the powder tank component and the opening of the heat preservation box, and make the scraper level the packaging powder in the powder tank component;

[0014] The packaging robotic arm is located in the heat preservation box, and the packaging robotic arm is used to drive the jig to enter the powder tank component from the heat preservation box and insert the varistor into the packaging powder.

[0015] In one embodiment, the packaging device further includes a feeding component, and the feeding component includes a hopper, a feeding pipe and a feeding screw located in the feeding pipe. The hopper is used to store the packaging powder, the feeding pipe extends toward the opening side of the powder tank component, and the rotation of the feeding screw is used to push the packaging powder in the hopper to advance along the feeding pipe.

[0016] In one embodiment, an activity door is provided on one side of the heat preservation box close to the oven and on the side close to the unloading rack respectively.

[0017] In one embodiment, a chain drive assembly is provided in each of the loading rack, the oven, and the unloading rack. A plurality of hanging plates are provided on the chain drive assembly, and the hanging plates are used to store the jigs.

[0018] In one embodiment, a pusher manipulator is provided between the loading rack and the oven, between the oven and the heat preservation box, and between the heat preservation box and the unloading rack. The pusher manipulator is used to push the jig on the hanging plate into the next working station.

[0019] In one embodiment, a heat preservation cover is provided outside the heat preservation box. When the heating door leaves the heat preservation box, the heat preservation cover covers the heating door.

[0020] In one embodiment, the encapsulation robotic arm includes a lead screw drive module, a hanging rack, and a pressing frame swing rod. The hanging rack is provided with two C-shaped support plates arranged opposite to each other. The C-shaped support plates are used to support the jig, and the pressing frame swing rod is rotatably arranged on the C-shaped support plate. The pressing frame swing rod is used to press the jig on the C-shaped support plate.

[0021] In one embodiment, an air extraction pipeline is provided on the leveling rack. A plurality of air extraction openings are opened on the air extraction pipeline, and the plurality of air extraction openings are distributed at intervals along the edge of the powder trough assembly.

[0022] In one embodiment, the powder trough assembly includes an air chamber, a trough body, a filter layer, and a heating coil. Both ends of the trough body are open. The air chamber is located at the bottom of the trough body. The filter layer is arranged between the air chamber and the trough body. Encapsulation powder is filled in the trough body. The heating coil is arranged in the air chamber. A sponge is filled in the air chamber. The sponge wraps the heating coil, and the air chamber is communicated with an external air pump; a weighing rack is provided at the bottom of the air chamber, and the weighing rack is used to detect the weight of the encapsulation powder in the trough body.

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

[0024] Step 1: Enter the control program and parameters related to the varistor to be encapsulated into the human-machine interface, clamp the varistor to be encapsulated on the jig, and start the control program to make the encapsulation equipment start working;

[0025] Step 2: Transfer the jig to the loading rack, and the jig on the lowermost layer in the loading rack enters the oven;

[0026] Step 3: The constant temperature device heats or cools the varistor entering the oven and performs constant temperature management;

[0027] Step 4: The temperature-controlled varistor enters the incubator with the fixture and is reheated;

[0028] Step 5: The encapsulation robot arm drives the fixture to descend, moves it from the incubator to the powder tank assembly, inserts the varistor into the encapsulation powder, and allows the encapsulation powder to wrap around the surface of the varistor;

[0029] Step 6: The encapsulation robot arm returns to the incubator with the fixture, and the sliding seat pushes the heating door and the leveling frame forward, causing the heating door to move and close the incubator, and the leveling frame to close the opening of the powder tank assembly;

[0030] Step 7: The heating door operates repeatedly to reheat the incubator until the encapsulation powder wrapped around the surface of the varistor melts and solidifies, forming an insulating layer on the surface of the varistor;

[0031] Step 8: Transfer the fixture from the incubator to the blanking rack for temporary storage and wait for blanking.

[0032] A varistor is prepared by the above varistor encapsulation process.

[0033] In summary, through the cooperation of the incubator, heating component, and powder tank assembly distributed in the order from top to bottom, the encapsulation process of the varistor is made coherent and orderly, improving the encapsulation efficiency and the encapsulation yield rate; improving the accuracy of the use of the encapsulation powder and avoiding waste of encapsulation materials; and reducing the volume of the encapsulation equipment and improving the space utilization rate. Brief Description of the Drawings

[0034] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0035] Figure 1 It is a schematic structural diagram of an intelligent encapsulation device for varistors;

[0036] Figure 2 It is a schematic structural diagram of the encapsulation device;

[0037] Figure 3 It is an internal structural diagram of the encapsulation device;

[0038] Figure 4 It is a diagram of the cooperation state of each component in the encapsulation device during hot melt curing;

[0039] Figure 5 It is a diagram of the cooperation state of each component in the encapsulation device during encapsulation;

[0040] Figure 6 Schematic structural diagram of the incubator;

[0041] Figure 7 Schematic structural diagram of the encapsulation robotic arm;

[0042] Figure 8 Schematic structural diagram of the fixture;

[0043] Figure 9 Schematic diagram of the cooperation of the heating door, leveling frame and sliding seat;

[0044] Figure 10 Exploded schematic diagram of the heating door and leveling frame;

[0045] Figure 11 Schematic diagram of the powder tank assembly;

[0046] Figure 12 Internal structure diagram of the powder tank assembly;

[0047] Figure 13 Schematic diagram of the cooperation of the chain drive assembly and the fixture.

[0048] Reference numerals: 10, intelligent encapsulation equipment for varistors; 11, human-machine interface; 20, varistor; 100, fixture; 110, clip; 200, loading rack; 300, oven; 310, temperature control device; 400, encapsulation device; 410, encapsulation robotic arm; 411, lead screw drive module; 412, hanging rack; 413, pressing frame swing rod; 414, C-shaped support plate; 420, incubator; 421, movable door; 422, heat preservation cover; 430, heating assembly; 431, heating door; 432, leveling frame; 433, sliding seat; 434, scraper; 435, exhaust duct; 4351, exhaust port; 440, powder tank assembly; 441, air cavity; 442, tank body; 443, filter layer; 444, heating coil; 445, weighing rack; 450, feeding assembly; 451, hopper; 452, feeding pipe; 453, feeding screw; 500, unloading rack; 600, chain drive assembly; 610, hanging plate; 700, pushing manipulator; Detailed implementation manners

[0049] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present invention more thorough and comprehensive.

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

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this invention belongs. The terms used in the description of the present invention herein are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0052] Please refer to Figure 1 , the present invention provides an intelligent packaging device 10 for a varistor, which includes: a human-machine interface 11, a plurality of jigs 100, and a loading rack 200, an oven 300, a packaging device 400, and an unloading rack 500 sequentially arranged along the transmission direction of the jig 100. The flow direction of the jig 100 is generally as follows: after the varistor is placed on the jig 100, it is stored in the loading rack 200. The jig 100 is transferred from the loading rack 200 to the oven 300. The oven 300 and the temperature control device 310 heat or cool the varistor to maintain its surface temperature at a set value in preparation for packaging. The varistor after temperature control management enters the packaging device 400 with the jig 100 to perform the packaging operation. Finally, the packaged varistor enters the unloading rack 500 with the jig 100 and waits for unloading.

[0053] Please refer to Figure 1 and Figure 8 , each jig 100 is provided with a plurality of clips 110. The clips 110 are used to clamp the varistor 20 to be packaged and suspend it below the jig 100. The loading rack 200, the oven 300, and the unloading rack 400 all accommodate a plurality of jigs 100 in a layered manner, that is, the loading rack 200, the oven 300, and the unloading rack 400 can all accommodate a plurality of jigs 100, and the respective jigs 100 in the loading rack 200, the oven 300, or the unloading rack 400 are stored in layers, so as to increase the accommodation quantity of the jigs 100 and improve the space utilization rate.

[0054] Please refer to Figure 1 , the oven 300 is provided with a temperature control device 310. The temperature control device 310 is used to heat or cool the varistor 20 on the jig 100 to maintain the temperature of the varistor at a set value;

[0055] Please refer to Figure 2and Figure 3 The encapsulation device 400 includes an encapsulation robot arm 410, and an incubator 420, a heating assembly 430, and a powder tank assembly 440 that are sequentially distributed from top to bottom. The powder tank assembly 440 is filled with encapsulation powder.

[0056] Please refer to Figure 4 、 Figure 9 and Figure 10 As shown in FIGS. and, the heating assembly 430 includes a heating door 431, a leveling frame 432, and a sliding seat 433. The heating door 431 faces the incubator 420. A squeegee 434 is provided on the leveling frame 432. The squeegee 434 extends into the powder tank assembly 440. The sliding seat 433 is used to drive the heating door 431 and the leveling frame 432 to translate synchronously, so as to open or close the opening of the powder tank assembly 440 and the opening of the incubator 420, and to make the squeegee 434 level the encapsulation powder in the powder tank assembly 440;

[0057] Please refer to Figure 4 and Figure 7 As shown in FIGS. and, the encapsulation robot arm 410 is located in the incubator 420. The encapsulation robot arm 410 is used to drive the fixture 100 to enter the powder tank assembly 440 from the incubator 420, and insert the varistor into the encapsulation powder.

[0058] The present application also provides a varistor encapsulation process, based on the above-mentioned intelligent encapsulation device 10 for varistors, including the following steps:

[0059] Step 1: Enter the control program and parameters related to the varistor to be encapsulated into the human-machine interface 11, and clamp the varistor to be encapsulated on the fixture 100; start the control program to make the encapsulation device 10 start working. The data during the operation of the device can be displayed through the touch screen of the human-machine interface 11, and the worker can set and adjust the encapsulation-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 puts the fixture 100 with the varistor 20 clamped into the loading rack 200. When the device starts, the lowermost fixture 100 in the loading rack 200 enters the oven 300. For example, Figure 1 As shown in FIG., a pusher robot arm 700 is provided between the loading rack 200 and the oven 300. The lowermost fixture 100 is sent into the oven 300 through the pusher robot arm 700. Among them, the speed at which the fixture 100 enters the oven 300 is related to the speed at which the encapsulation device 400 encapsulates the varistor 20. When a fixture 100 enters the encapsulation device 400 for the encapsulation process, the fixture 100 in the loading rack 200 is sent into the oven 300.

[0061] Step 3: The thermostat 310 heats or cools the varistors entering the oven 300 and performs temperature control management.

[0062] Step 4: The varistors that have undergone temperature control management enter the encapsulation device 400 with the fixture 100.

[0063] Step 5: The encapsulation robotic arm 410 drives the fixture 100 to descend, moving it from the incubator 420 to the powder trough assembly 440, inserting the varistor into the encapsulation powder, and allowing the encapsulation powder to wrap around the surface of the varistor.

[0064] Step 6: The encapsulation robotic arm 410 returns with the fixture 100 to the incubator 420, and the sliding seat 433 pushes the heating door 431 and the leveling frame 432 forward, moving the heating door 431 below the incubator 420 and closing the opening of the powder trough assembly 440 with the leveling frame 432.

[0065] Step 7: The heating door 431 operates repeatedly to reheat the incubator 420 until the encapsulation powder wrapped around the surface of the varistor melts and solidifies, forming an insulating layer on the surface of the varistor.

[0066] Step 8: The fixture 100 is transferred from the incubator 420 to the blanking rack 500 for temporary storage, waiting for blanking.

[0067] The working principle of the intelligent encapsulation device 10 for the above varistors is as follows:

[0068] The varistor 20 is clamped on the clip 110, and the state where the varistor 20 is suspended below the fixture 100 is as Figure 8 shown, and then the fixture 100 is placed in the loading rack 200.

[0069] When the device is started, the fixture 100 at the bottom layer in the loading rack 200 is pushed into the oven 300, and the thermostat 310 in the oven 300 heats or cools to adjust the temperature of the varistor 20 to maintain it at the set value; the fixture 100 at the top layer in the oven 300 is pushed into the encapsulation device 400 for encapsulation operation.

[0070] The fixture 100 entering the encapsulation device 400 is caught by the encapsulation robotic arm 410. In the encapsulation device 400, the incubator 420, the heating component 430, and the powder trough assembly 440 are distributed in sequence from top to bottom. That is, at this time, the fixture 100 is inside the incubator 420, and the heating door 431 faces the incubator 420, which can maintain the surface temperature of the varistor 20.

[0071] Please refer to Figure 4 and Figure 5, when performing the encapsulation operation, the sliding seat 433 drives the heating door 431 and the leveling frame 432 to translate synchronously, so that the leveling frame 432 is staggered from the powder tank assembly 440, opening the opening of the powder tank assembly 440, and the heating door 431 leaves below the heat preservation box 420. At this time, both the lower part of the heat preservation box 420 and the opening of the powder tank assembly 440 are in a closed state. The encapsulation robotic arm 410 drives the fixture 100 to descend, so that the fixture 100 is transferred from the heat preservation box 420 into the powder tank assembly 440, and the varistor 20 is inserted into the encapsulation powder. As Figure 5 shown, the parts of the varistor 20 to be encapsulated are adhered with the encapsulation powder; after the encapsulation powder wraps the varistor 20, the encapsulation robotic arm 410 resets, making the fixture 100 return to the heat preservation box 420, and the sliding seat 433 drives the heating door 431 and the leveling frame 432 to reset. As Figure 4 shown, the heating door 431 heats the heat preservation box 420, so that the encapsulation powder adhered to the varistor 20 is melted and solidified to form an insulating layer; finally, the varistor 20 after the hot melt curing enters the blanking frame 500 with the fixture 100 and waits for blanking.

[0072] Among them, when the sliding seat 433 drives the heating door 431 and the leveling frame 432 to translate synchronously, the scraper 434 on the leveling frame 432 moves from one end of the powder tank assembly 440 to the other end, and its position changes from the position shown in Figure 4 to the position shown in Figure 5 . The process of the scraper 434 translating inside the powder tank assembly 440 can sweep the encapsulation powder flat, ensuring that the varistor 20 is in a flat state before powdering, so as to ensure that the parts to be encapsulated of the varistor 20 can be completely wrapped by the encapsulation powder after entering the powder tank assembly 440.

[0073] It should be emphasized that the heat preservation box 420, the heating component 430 and the powder tank assembly 440 in the encapsulation device 400 are distributed in sequence from top to bottom. The encapsulation robotic arm 410 drives the fixture 100 to descend into the powder tank assembly 440, and immediately returns to the heat preservation box 420 after the encapsulation powder wraps the varistor 20 for hot melt curing without waiting. On the one hand, the encapsulation efficiency is improved. On the other hand, it avoids the shedding of the encapsulation powder on the surface of the varistor 20 caused by standby after powdering, resulting in an incomplete insulating layer after curing, and improves the stability of the encapsulation process.

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

[0075] 1. The fixture 100 is stored in a layered manner in the loading rack 200, the oven 300, and the unloading rack 500. This increases the number of fixtures 100 that can be stored per unit area, helps reduce the overall volume of the equipment, improves the space utilization rate of the equipment, and at the same time avoids the problem that product retention during the waiting for the encapsulated powder to melt and solidify affects the normal operation of other process steps, and solves the problem of high encapsulation defect rate of varistors caused by uneven temperature and large encapsulation temperature difference during the retention process of the product.

[0076] 2. The oven 300 and the constant temperature device 310 are configured to heat or cool the varistor to be encapsulated and then perform constant temperature treatment. The varistor is brought into a constant temperature state in advance before entering the encapsulation position, reducing the temperature adjustment time during the encapsulation process, thereby improving the encapsulation efficiency and the encapsulation yield.

[0077] 3. The insulation box 420 and the powder tank assembly 440 are integrated in the same equipment. After the varistor is wrapped with the encapsulation powder, it returns to the insulation box 420 for hot melt curing. This makes the process of the varistor being wrapped with the encapsulation powder and hot melt curing closely connected. The encapsulation powder is immediately hot melt cured after wrapping the varistor without waiting. While reducing the equipment volume, it can also prevent the problem of encapsulation defects caused by the encapsulation powder falling off due to untimely hot melt curing.

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

[0079] Please refer to Figure 2 and Figure 4 , in one embodiment, the encapsulation device 400 further includes a feeding component 450. The feeding component 450 includes a hopper 451, a feeding pipe 452, and a feeding screw 453 located inside the feeding pipe 452. The hopper 451 is used to store the encapsulation powder. The feeding pipe 452 extends toward the opening side of the powder tank assembly 440. The rotation of the feeding screw 453 can push the encapsulation powder in the hopper 451 to advance along the feeding pipe 452, transferring the encapsulation powder from the hopper 451 to the powder tank assembly 440. By controlling the feeding amount of the encapsulation powder through the feeding screw 453, quantitative feeding is achieved, keeping the amount of the encapsulation powder in the powder tank assembly 440 unchanged and maintaining the depth of the encapsulation powder in the powder tank assembly 440 at a relatively stable height. After the encapsulation robotic arm 410 drives the fixture 100 to descend, it ensures that the part of the varistor 20 to be encapsulated can be completely inserted into the encapsulation powder, thereby ensuring that the part of the varistor 20 to be encapsulated can stably adhere to a sufficient amount of encapsulation powder. The amount of the encapsulation powder does not need to be judged by manual experience and can be accurately input according to requirements, which is beneficial to reducing encapsulation defects caused by improper use of the encapsulation powder and avoiding waste.

[0080] Please refer to Figure 3and Figure 6 In one embodiment, an active door 421 is provided on one side of the incubator 420 close to the oven 300 and on the side close to the blanking rack 500. In this way, when the fixture 100 enters or leaves the incubator 420, the corresponding active door 421 can be opened and closed after the entry and exit actions are completed, so that the incubator 420 is in a relatively sealed state, avoiding heat leakage, which may lead to an extended encapsulation time and reduced encapsulation efficiency.

[0081] Please refer to Figure 13 In one embodiment, a chain drive assembly 600 is provided in the loading rack 200, the oven 300, and the blanking rack 500. A plurality of hanging plates 610 are provided on the chain drive assembly 600, and the hanging plates 610 are used to store the fixtures 100. As a result, the fixtures 100 in the loading rack 200, the oven 300, and the blanking rack 500 are stored in a layered manner. When the chain drive assembly 600 is started, multiple layers of fixtures 100 can be lifted or lowered simultaneously, so that the uppermost or lowermost fixture 100 can be moved to the position to be transferred.

[0082] Please refer to Figure 1 Between the loading rack 200 and the oven 300, between the oven 300 and the incubator 420, and between the incubator 420 and the blanking rack 500, a pusher manipulator 700 is provided. The pusher manipulator 700 is used to push the fixture 100 on the hanging plate 610 at the position to be transferred into the next process. Combining with the working principle of the intelligent encapsulation device 10 for varistors, if the pushed fixture 100 is in the loading rack 200, then the "next station" here refers to the oven 300; if the pushed fixture 100 is in the oven 300, then the "next station" here refers to the incubator 420, and so on.

[0083] Please refer to Figure 5 and Figure 6 In one embodiment, a thermal insulation cover 422 is provided outside the incubator 420. When the opening of the powder tank assembly 440 is in an open state, the thermal insulation cover 422 covers the heating door 431. The thermal insulation cover 422 only functions when the encapsulation robotic arm 410 drives the varistor 20 to dip powder. Specifically, when the varistor 20 dips 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 to the lower part of the thermal insulation cover 422. As shown in Figure 5 The heating door 431 is covered by the thermal insulation cover 422, preventing the heat on the heating door 431 from radiating outwards during the powder dipping process. On the one hand, it avoids heat loss, which may lead to a longer subsequent hot melt curing time; on the other hand, it can also protect the surrounding accessories and prevent the overflowing heat from affecting the normal operation of the external accessories.

[0084] Please refer to Figure 3 and Figure 7, In one embodiment, the encapsulation robotic arm 410 includes a lead screw drive module 411, a hanging bracket 412, and a pressing frame swing rod 413. The hanging bracket 412 is provided with two C-shaped pallets 414 arranged oppositely. The C-shaped pallets 414 are used to support the fixture 100. The pressing frame swing rod 413 is rotatably arranged on the C-shaped pallet 414, and the pressing frame swing rod 413 is used to press the fixture 100 on the C-shaped pallet 414. The bending position on the C-shaped pallet 414 provides support for the fixture 100. The two ends of the support structure formed by the C-shaped pallets 414 are unobstructed. Therefore, the pusher manipulator 700 can push the fixture 100 to translate, so that the fixture 100 can enter and exit the incubator 420. The pressing frame swing rod 413 arranged on the C-shaped pallet 414 provides pressure to press the fixture 100 on the C-shaped pallet 414, providing pressure to prevent the fixture 100 from jumping and shifting due to the reaction force generated when the varistor 20 is inserted into the encapsulation powder.

[0085] Please refer to Figure 9 and Figure 10 , In one embodiment, an air extraction pipeline 435 and a temporary storage box (not shown in the figure) communicated with the air extraction pipeline 435 are provided on the leveling frame 432. A plurality of air extraction openings 4351 are opened on the air extraction pipeline 435, and the plurality of air extraction openings 4351 are spaced along the edge of the powder trough assembly 440. From the working principle of the intelligent encapsulation device 10 of the varistor, the encapsulation material is powder. Therefore, when the varistor 20 is inserted and withdrawn, some encapsulation powder will be lifted. To prevent these lifted powders from escaping, the air extraction pipeline 435 is configured on the leveling frame 432, and the air extraction openings 4351 thereon are spaced along the edge of the powder trough assembly 440. The lifted encapsulation powder is sucked away through the air extraction pipeline 435 and introduced into the temporary storage box to prevent it from escaping to the outside of the device. The encapsulation powder stored in the temporary storage box is put into the hopper 451 in batches on the same day for continued use, avoiding waste of the encapsulation powder. Among them, the air extraction pipeline 435 is located on the leveling frame 432, there is a gap between it and the powder trough assembly 440, and the wind force of the air extraction pipeline 435 is weak, only used to suck away the encapsulation powder lifted and floating in the air due to the encapsulation action, thereby ensuring that there will be no powder trough scattered in the air polluting the workshop environment after the equipment protection door is opened, and improving the environmental protection level of the workshop.

[0086] Please refer to Figure 11 and Figure 12, In one embodiment, the powder tank assembly 440 includes an air cavity 441, a tank body 442, a filter layer 443, and a heating coil 444. Both ends of the tank body 442 are open. The air cavity 441 is located at the bottom of the tank body 442. The filter layer 443 is disposed between the air cavity 441 and the tank body 442. Encapsulated powder is filled in the tank body 442. The heating coil 444 is disposed in the air cavity 441. The air cavity 441 is filled with sponge, and the sponge wraps the heating coil 444. Moreover, the air cavity 441 is communicated with an external air pump; a weighing rack 445 is provided at the bottom of the air cavity 441, and the weighing rack 445 is used to detect the weight of the encapsulated powder in the tank body 442. The effects of the powder tank assembly 440 are as follows:

[0087] The air cavity 441 is communicated with an external air pump. The air pump fills air into the air cavity 441, so that the air flows towards the tank body 442. The air entering the air cavity 441 is heated by the heating coil 444 to form hot air, and the encapsulated powder in the tank body 442 is heated by these hot air, thereby regulating the temperature of the encapsulated powder to make it in a state that is easy to adhere to the varistor 20. It should be noted that when the air enters the tank body 442 from the air cavity 441, it needs to pass through the sponge and the filter layer 443, which can filter out water vapor, oil droplets, etc. in the air and prevent the encapsulated powder from getting damp and agglomerating.

[0088] The above-described embodiments merely represent several implementation manners of the present invention. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. An intelligent encapsulation device for a varistor, characterized in that, Including: A human-machine interface, a plurality of jigs, a loading rack, an oven, a packaging device, and an unloading rack sequentially arranged along the transmission direction of the jigs; Each of the jigs is provided with a plurality of clips, and the clips are used to hold the varistors to be packaged and suspend them below the jigs. The loading rack, the oven, and the unloading rack all accommodate a plurality of the jigs in a layered manner; A constant-temperature device is provided in the oven, and the constant-temperature device is used for constant-temperature management of the varistors on the jigs; The packaging device includes a packaging robotic arm, and a heat preservation box, a heating component, and a powder tank component sequentially distributed from top to bottom. The powder tank component is filled with packaging powder. The heating component includes a heating door, a leveling frame, and a sliding seat. The heating door faces the heat preservation box. A scraper is provided on the leveling frame, and the scraper extends into the powder tank component. The sliding seat is used to drive the heating door and the leveling frame to translate synchronously to open or close the opening of the powder tank component and the opening of the heat preservation box, and to make the scraper level the packaging powder in the powder tank component; The packaging robotic arm is located in the heat preservation box, and the packaging robotic arm is used to drive the jig to enter the powder tank component from the heat preservation box and insert the varistor into the packaging powder.

2. The intelligent packaging device for varistors according to claim 1, characterized in that The packaging device further includes a feeding component, and the feeding component includes a hopper, a feeding pipe, and a feeding screw located in the feeding pipe. The hopper is used to store packaging powder. The feeding pipe extends toward the opening side of the powder tank component. The rotation of the feeding screw is used to push the packaging powder in the hopper to advance along the feeding pipe.

3. The intelligent packaging device for the varistor according to claim 1, characterized in that, One movable door is provided on each of the sides of the heat preservation box close to the oven and close to the unloading rack.

4. The intelligent packaging device for varistors according to claim 1, characterized in that, Chain transmission components are provided in the loading rack, the oven, and the unloading rack. A plurality of hanging plates are provided on the chain transmission components, and the hanging plates are used to store the jigs; Pushing robotic arms are provided between the loading rack and the oven, between the oven and the heat preservation box, and between the heat preservation box and the unloading rack. The pushing robotic arms are used to push the jigs on the hanging plates into the next working station.

5. The intelligent packaging device for the varistor according to claim 1, characterized in that, A heat preservation cover is provided outside the heat preservation box. When the heating door leaves the heat preservation box, the heat preservation cover covers the heating door.

6. The intelligent packaging device for varistors according to claim 1, characterized in that, The packaging robotic arm includes a screw rod transmission module, a hanging rack, and a pressing frame swing rod. The hanging rack is provided with two C-shaped supporting plates arranged oppositely, and the C-shaped supporting plates are used to support the jig. The pressing frame swing rod is rotatably arranged on the C-shaped supporting plate, and the pressing frame swing rod is used to press the jig on the C-shaped supporting plate.

7. The intelligent packaging device for the varistor according to claim 1, wherein An air extraction pipeline is provided on the leveling frame, and a plurality of air extraction openings are opened on the air extraction pipeline. The plurality of air extraction openings are spaced apart along the edge of the powder tank component.

8. The intelligent packaging device for a varistor according to claim 1, characterized in that, The powder tank assembly includes an air chamber, a tank body, a filter layer and a heating coil. Both ends of the tank body are open. The air chamber is located at the bottom of the tank body. The filter layer is provided between the air chamber and the tank body. Encapsulation powder is filled in the tank body. The heating coil is provided in the air chamber. A sponge is filled in the air chamber. The sponge wraps the heating coil, and the air chamber is communicated with 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 encapsulation powder in the tank body.

9. A varistor encapsulation process, based on the intelligent encapsulation device for varistors described in any one of claims 1 to 8, characterized in that, It includes the following steps: Step 1: Enter the control program and parameters related to the varistor to be encapsulated into the human-machine interface, clamp the varistor to be encapsulated on the fixture, and start the control program to make the encapsulation equipment work. Step 2: Transfer the fixture to the loading rack, and the fixture in the bottom layer of the loading rack enters the oven. Step 3: The constant temperature device heats or cools the varistor entering the oven and performs constant temperature management. Step 4: The varistor after constant temperature management enters the incubator with the fixture for reheating. Step 5: The encapsulation robotic arm drives the fixture to descend, moves it from the incubator to the powder tank assembly, inserts the varistor into the encapsulation powder, and makes the encapsulation powder wrap around the surface of the varistor. Step 6: The encapsulation robotic arm brings the fixture back to the incubator, and the sliding seat pushes the heating door and the leveling frame forward to close the heating door of the incubator and make the leveling frame close the opening of the powder tank assembly. Step 7: The heating door operates repeatedly to reheat the incubator until the encapsulation powder wrapped around the surface of the varistor melts and solidifies to form an insulating layer on the surface of the varistor. Step 8: Transfer the fixture from the incubator to the unloading rack for temporary storage and wait for unloading.

10. A varistor, characterized in that, Prepared by the varistor encapsulation process described in claim 9.

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