Surface coating method of PPTC (Polymeric Positive Temperature Coefficient) element

Abstract

The invention relates to a surface coating method of a PPTC element, surface coating equipment of the PPTC element comprises a jig, a rubberizing machine and an automatic end capping machine, the jig is provided with a plurality of through holes, and the method comprises the steps that primer is pasted on the back face of the jig through the rubberizing machine; a plurality of PPTC elements to be coated are arranged in the through holes of the jig and are adhered to the primer of the jig, and the PPTC elements to be coated are in one-to-one correspondence with the through holes; and placing the jig on which the PPTC element to be coated is fixed on the automatic end capping machine on which the protective glue is paved, and coating the protective glue on the PPTC element to be coated fixed in the jig by utilizing the automatic end capping machine. According to the surface coating method of the PPTC element, the coating efficiency of the surface protection glue of the PPTC element can be improved.

Description

Technical Field

[0001] This application relates to the technical field of thermistors, and particularly to a surface coating method for PPTC components. Background Art

[0002] Polymer PTC (abbreviation: PPTC) is a self - restoring fuse, and its main raw materials include polymer resin and conductive filler. Through a series of process steps, such as high - temperature kneading, granulation, extrusion, and lamination, these two materials are dispersed and fused with each other, and finally a thermistor core material with a positive temperature coefficient characteristic is formed. These core materials can be further processed into products of different packaging types, such as plug - in type, battery chip type, and chip type.

[0003] The chip - type PPTC component has a hexahedron structure, with solder mask ink and conductive pads covering the upper and lower bottom surfaces, and the rest of the four sides exposing the core material; since the conductive filler is an inorganic material and the polymer resin is an organic material, they are combined only by physical connection rather than chemical reaction. Therefore, many tiny pores will be formed during the fusion process. If these core materials are directly exposed to the air, moisture is likely to penetrate into the material interior through these pores, affecting the electrical performance and weather resistance of the chip - type PPTC component.

[0004] In order to improve the weather resistance and electrical performance of the chip - type PPTC component, the related technology uses the screen - printing method to successively print the protective glue on the outer periphery of the chip - type PPTC component and then perform thermal curing to effectively protect the exposed core material in the chip - type PPTC component. However, this method is a manual printing method, and the coating efficiency of the protective glue is relatively low. Summary of the Invention

[0005] The embodiments of this application provide a surface coating method for PPTC components, aiming to improve the coating efficiency of the protective glue on the surface of PPTC components.

[0006] In a first aspect, the embodiments of this application provide a surface coating method for PPTC components. The surface coating equipment for the PPTC components includes a jig, a glue - sticking machine, and an automatic end - sealing machine. The jig is provided with a plurality of through - holes, and the method includes:

[0007] Using the glue - sticking machine to stick the bottom glue on the reverse side of the jig;

[0008] Loading a plurality of PPTC components to be coated into the plurality of through - holes of the jig and adhering them to the bottom glue of the jig, where the PPTC components to be coated correspond to the through - holes one by one;

[0009] Place the fixture for fixing the PPTC component to be painted on the automatic capping machine covered with protective glue, and use the automatic capping machine to coat the protective glue on the PPTC component to be painted fixed in the fixture.

[0010] In some embodiments, the PPTC component to be painted includes a vertical surface and a side surface, and the fixture includes a first fixture and a second fixture. Among them, the through-hole length of the second fixture is greater than the through-hole length of the first fixture, and the through-hole length of the second fixture is greater than the sum of the lengths of the vertical surface and the side surface of the PPTC component to be painted;

[0011] Loading the plurality of PPTC components to be painted into the plurality of through-holes of the fixture and adhering them to the bottom glue of the fixture includes:

[0012] If coating the vertical surface of the PPTC component to be painted, load the plurality of PPTC components to be painted into the plurality of through-holes of the first fixture and adhere them to the bottom glue of the first fixture;

[0013] If coating the side surface of the PPTC component to be painted, load the plurality of PPTC components to be painted into the plurality of through-holes of the second fixture and adhere them to the bottom glue of the second fixture.

[0014] In some embodiments, the surface coating equipment for the surface-mounted PPTC component further includes a leveling machine and a pushing-down machine. After loading the plurality of PPTC components to be painted into the plurality of through-holes of the fixture, the method further includes:

[0015] If coating the vertical surface of the PPTC component to be painted, use the leveling machine to flatten the PPTC component to be painted loaded into the fixture;

[0016] If coating the side surface of the PPTC component to be painted, use the pushing-down machine to push down and level the PPTC component to be painted loaded into the fixture.

[0017] In some embodiments, the surface coating equipment for the surface-mounted PPTC component further includes an automatic drying furnace. After using the automatic capping machine to coat the protective glue on the PPTC component to be painted fixed in the fixture, the method further includes:

[0018] Place the PPTC component to be painted that has been coated and fixed in the fixture in the automatic drying furnace, and use the automatic drying furnace to cure the protective glue on the surface of the PPTC component to be painted.

[0019] In some embodiments, the surface coating equipment for the surface-mounted PPTC component further includes a face-changing machine. The vertical surface of the PPTC component to be painted includes a first vertical surface and a second vertical surface. The method includes:

[0020] When the first facade of the PPTC component to be painted fixed in the first fixture has been coated with protective glue and cured, apply a base glue on the front side of the first fixture, so that the first facade coated with protective glue adheres to the base glue on the front side of the first fixture;

[0021] Tear off the base glue pasted on the reverse side of the first fixture;

[0022] Place the first fixture with the reverse side base glue torn off on the surface changer, wherein the front side of the first fixture is placed opposite to the surface changer;

[0023] Use the surface changer to move the PPTC component to be painted from the front side of the first fixture along the reverse side of the first fixture, so as to expose the second facade of the PPTC component to be painted outside the through hole on the reverse side of the first fixture;

[0024] Coat and cure the protective glue on the second facade exposed outside the through hole on the reverse side of the first fixture.

[0025] In some embodiments, the surface coating device for the surface-mounted PPTC component further includes a discharging machine, the discharging machine is provided with a first steel bar and a second steel bar, the first steel bar and the second steel bar are arranged relatively at intervals, and a limiting space is formed between the first steel bar and the second steel bar;

[0026] After coating and curing the protective glue on the second facade exposed outside the through hole on the reverse side of the first fixture, the method further includes:

[0027] Place the first fixture in the limiting space, tear off the base glue on the front side of the first fixture, and use the discharging machine to separate the PPTC component already painted on the first fixture from the first fixture.

[0028] In some embodiments, the surface coating device for the surface-mounted PPTC component further includes a surface changer, the side surface of the PPTC component to be painted includes a first side surface and a second side surface, and the method includes:

[0029] When the first side surface of the PPTC component to be painted fixed in the second fixture has been coated with protective glue and cured, apply a base glue on the front side of the second fixture, so that the first side surface coated with protective glue adheres to the base glue on the front side of the second fixture;

[0030] Tear off the base glue pasted on the reverse side of the second fixture;

[0031] Place the second fixture with the reverse side base glue torn off on the surface changer, wherein the front side of the second fixture is placed opposite to the surface changer;

[0032] Use the surface-changing machine to move the PPTC component to be coated from the front of the second fixture along the back of the second fixture, so as to expose the second side of the PPTC component to be coated outside the through-hole on the back of the second fixture;

[0033] Coat and cure the protective glue on the second side exposed outside the through-hole on the back of the second fixture.

[0034] In some embodiments, the surface coating device for the patch PPTC component further includes a discharging machine, the discharging machine is provided with a first steel bar and a second steel bar, the first steel bar and the second steel bar are arranged at intervals relatively, and a limiting space is formed between the first steel bar and the second steel bar;

[0035] After coating and curing the protective glue on the second side exposed outside the through-hole on the back of the second fixture, the method further includes:

[0036] Place the second fixture in the limiting space, tear off the bottom glue on the front of the second fixture, and use the discharging machine to unload the coated PPTC component on the second fixture into the accommodating space of the discharging machine.

[0037] In some embodiments, the surface coating device for the PPTC component further includes a vibrating feeder, and loading a plurality of PPTC components to be coated into the plurality of through-holes of the fixture includes:

[0038] Use the vibrating feeder to vibrate and load a plurality of PPTC components to be coated into the plurality of through-holes of the fixture.

[0039] In some embodiments, the surface coating device for the PPTC component further includes a guiding plate, and loading a plurality of PPTC components to be coated into the plurality of through-holes of the fixture by using the vibrating feeder includes:

[0040] Stack the guiding plate on the front of the fixture;

[0041] Place the fixture with the guiding plate stacked thereon on the vibrating feeder;

[0042] Pour a plurality of the PPTC components to be coated onto the guiding plate, and use the vibration of the vibrating feeder to load the plurality of PPTC components to be coated into the plurality of through-holes of the fixture.

[0043] An embodiment of the present application provides a surface coating method for a PPTC component. Among them, the method includes: using the tape applicator to apply the bottom glue on the reverse side of the fixture; loading a plurality of PPTC components to be coated into a plurality of through holes of the fixture and adhering them to the bottom glue of the fixture, where the PPTC components to be coated correspond to the through holes one by one; placing the fixture fixed with the PPTC components to be coated on the automatic capping machine covered with the protective glue, and using the automatic capping machine to coat the protective glue on the PPTC components to be coated fixed in the fixture. In this way, by using the automatic capping machine to coat the protective glue on the PPTC components to be coated fixed in the fixture, the coating efficiency of the protective glue on the surface of the PPTC component can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The accompanying drawings herein are incorporated into the specification and constitute a part of this specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application.

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0046] One or more embodiments are exemplarily illustrated by the pictures in the corresponding accompanying drawings. These exemplary illustrations do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, unless otherwise stated, and the drawings in the drawings do not constitute a proportional limitation.

[0047] Figure 1 Schematic flowchart of the first embodiment of a surface coating method for a PPTC component provided by the present application;

[0048] Figure 2 Schematic structural diagram of the PPTC component provided by the present application after coating is completed;

[0049] Figure 3 Schematic flowchart of the surface coating method for a PPTC component provided by the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0050] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the following will clearly and completely describe the technical solutions in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are some, but not all, of the embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts shall fall within the scope of protection of this application.

[0051] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure of this application, components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit this application. In addition, this application may repeat reference numerals and / or letters in different examples. This repetition is for the purpose of simplification and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed.

[0052] It should be understood that when used in this specification and the appended claims, the terms "comprises" and "comprising" indicate the presence of the described features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or their groups.

[0053] It should also be understood that the terms used in this specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. As used in this specification of this application and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" are intended to include the plural forms.

[0054] It should be further understood that the term "and / or" used in this specification of this application and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0055] As used in this specification and the appended claims, the term "if" can be interpreted as "when", "once", "in response to determining", or "in response to detecting" according to the context. Similarly, the phrase "if determined" or "if [the described condition or event] is detected" can be interpreted as meaning "once determined", "in response to determining", "once [the described condition or event] is detected", or "in response to detecting [the described condition or event]" according to the context.

[0056] Polymer PTC (abbreviated as PPTC) is a self - restoring fuse, and its main raw materials include polymer resin and conductive filler. Through a series of technological steps, such as high - temperature internal mixing, granulation, extrusion, and lamination, these two materials are dispersed and fused with each other, and finally a thermistor core material with positive temperature coefficient characteristics is formed. These core materials can be further processed into products with different packaging types, such as plug - in type, battery chip type, and surface - mount type.

[0057] The surface - mount type PPTC component has a hexahedron structure. The upper and lower bottom surfaces are covered with solder mask ink and conductive pads, and the rest of the four sides expose the core material. Since the conductive filler is an inorganic material and the polymer resin is an organic material, they are combined only by physical connection rather than chemical reaction. Therefore, many tiny pores will be formed during the fusion process. If these core materials are directly exposed to the air, moisture is likely to penetrate into the material through these pores, affecting the electrical performance and weather resistance of the surface - mount type PPTC component.

[0058] In order to improve the weather resistance and electrical performance of the surface - mount type PPTC component, the related technologies adopt the following two methods:

[0059] The first method: Coat the six surfaces of the surface - mount type PPTC component with a plastic - encapsulated layer. Specifically, first wrap the six surfaces of the surface - mount type PPTC component with plastic - encapsulating material, then attach copper foil (to make the surface - mount type PPTC component conductive), drill holes (to make the surface - mount type PPTC component weldable), and then cut along the pad spacer line.

[0060] However, the coating process of six - surface plastic encapsulation is relatively complex. During the process, problems such as low yield and slow efficiency may occur due to reasons such as the dimensional consistency of the surface - mount type PPTC component and equipment errors, resulting in a relatively high cost for this method.

[0061] The second method: Adopt the screen - printing method, that is, sequentially print the protective glue on the outer periphery of the surface - mount type PPTC component and then perform thermal curing to effectively protect the exposed core material in the surface - mount type PPTC component. However, this method is a manual printing method, and the coating efficiency of the protective glue is relatively low.

[0062] In order to solve the technical problem of the relatively low coating efficiency of the protective glue in the existing technology, this application provides a surface coating method for PPTC components, which can improve the coating efficiency of the protective glue on the surface of PPTC components.

[0063] The surface coating equipment for PPTC components provided by the embodiments of this application includes a fixture, a tape - sticking machine, and an automatic end - sealing machine. The fixture is provided with a plurality of through - holes. Refer to Figure 1 , Figure 1 is a schematic flow chart of the first embodiment of a surface coating method for PPTC components provided by this application. The method includes the following steps:

[0064] Step 110: Use the glue sticking machine to stick the base glue on the back side of the jig.

[0065] Step 120: Install a plurality of PPTC components to be coated into a plurality of through holes of the jig, and adhere them to the base glue of the jig, wherein the PPTC components to be coated correspond to the through holes one by one.

[0066] Step 130: placing the jig with the PPTC component to be coated fixed thereon on the automatic terminal sealing machine covered with protective glue, and using the automatic terminal sealing machine to coat the PPTC component to be coated fixed in the jig with protective glue.

[0067] This embodiment uses an automatic sealing machine to coat the protective glue on the PPTC component to be coated fixed in the fixture. The operation is simple and the coating is automatic, which can improve the coating efficiency of the protective glue on the surface of the PPTC component.

[0068] In addition, since the screen printing method has relatively high requirements on the size of the SMD PPTC component, after the SMD PPTC component is loaded into the jig, if the size of the SMD PPTC component is relatively small, the gap between the jig and the SMD PPTC component is large. At this time, the printing ink can easily penetrate into the periphery of the SMD PPTC component and the jig itself, resulting in the need to clean the jig, which is more cumbersome; and if the size of the SMD PPTC component is too large, it is easy for the SMD PPTC component to be unable to be loaded into the jig, or it is difficult to unload after loading in the jig, resulting in a relatively low coating efficiency of the SMD PPTC component.

[0069] In this embodiment, the PPTC component to be coated is indirectly fixed to the jig by adhering to the base glue. Therefore, when the PPTC component to be coated is small in size, it can also ensure that the PPTC component to be coated is tightly adhered to the jig and is not easy to shift or loosen during subsequent operations. When unloading is required, the base glue can be directly torn off to quickly remove the PPTC component in the through hole of the jig from the jig, thereby improving the problem that the chip-type PPTC component is too large and stuck in the card slot of the jig and is not easy to unload.

[0070] And because the protective glue is spread on the automatic terminal sealing machine, the PPTC component to be coated can be coated with the protective glue by sticking, avoiding the protective glue from penetrating from the gap between the PPTC component to be coated and the jig to the periphery of the PPTC component to be coated or the jig itself, and there is no need to clean the protective glue that has penetrated the jig, thereby improving the coating efficiency and coating effect of the protective glue.

[0071] In addition, since the PPTC component to be painted is indirectly fixed on the fixture by adhering to the bottom glue, and the PPTC component to be painted is painted with the protective glue by picking, the fixture in this application has a high tolerance for the size of the PPTC component to be painted, and can be compatible with the PPTC components to be painted with the same height but different thicknesses at the same time. For example, the thickness can be 0.8 mm and 1.0 mm.

[0072] In some embodiments, referring to Figure 2 , the PPTC component to be painted includes an upright surface and a side surface, and the fixture includes a first fixture and a second fixture. Among them, the through-hole length of the second fixture is greater than the through-hole length of the first fixture, and the through-hole length of the second fixture is greater than the sum of the lengths of the upright surface and the side surface of the PPTC component to be painted;

[0073] In step 120, loading a plurality of PPTC components to be painted into the plurality of through-holes of the fixture and adhering them to the bottom glue of the fixture includes:

[0074] Step 121: If the upright surface of the PPTC component to be painted is coated, load a plurality of the PPTC components to be painted into the plurality of through-holes of the first fixture and adhere them to the bottom glue of the first fixture;

[0075] Step 122: If the side surface of the PPTC component to be painted is coated, load a plurality of the PPTC components to be painted into the plurality of through-holes of the second fixture and adhere them to the bottom glue of the second fixture.

[0076] In some embodiments, the surface coating device for the chip PPTC component further includes a leveling machine and a pushing-down machine. After loading a plurality of PPTC components to be painted into the plurality of through-holes of the fixture, the method further includes:

[0077] If the upright surface of the PPTC component to be painted is coated, use the leveling machine to flatten the PPTC component to be painted loaded into the fixture;

[0078] If the side surface of the PPTC component to be painted is coated, use the pushing-down machine to push down and level the PPTC component to be painted loaded into the fixture.

[0079] In some embodiments, the surface coating device for the chip PPTC component further includes an automatic drying furnace. After coating the protective glue on the PPTC component to be painted fixed in the fixture by using the automatic capping machine, the method further includes:

[0080] Place the coated PPTC component to be painted, which is fixed in the fixture, in the automatic drying furnace, and cure the protective glue on the surface of the PPTC component to be painted by using the automatic drying furnace.

[0081] In some embodiments, the surface coating device of the surface-mounted PPTC component further includes a face-changing machine. The vertical surface of the PPTC component to be painted includes a first vertical surface and a second vertical surface. The method includes:

[0082] When the first vertical surface of the PPTC component to be painted, which is fixed in the first fixture, has been coated with the protective glue and cured, then stick the bottom glue on the front of the first fixture so that the first vertical surface with the protective glue coated adheres to the bottom glue on the front of the first fixture;

[0083] Tear off the bottom glue stuck on the back of the first fixture;

[0084] Place the first fixture with the bottom glue on the back torn off on the face-changing machine, wherein the front of the first fixture is placed opposite to the face-changing machine;

[0085] Use the face-changing machine to move the PPTC component to be painted from the front of the first fixture along the back of the first fixture, so that the second vertical surface of the PPTC component to be painted is exposed outside the through hole on the back of the first fixture;

[0086] Coat and cure the protective glue on the second vertical surface exposed outside the through hole on the back of the first fixture.

[0087] In some embodiments, the surface coating device of the surface-mounted PPTC component further includes a discharging machine. The discharging machine is provided with a first steel bar and a second steel bar. The first steel bar and the second steel bar are arranged relatively at intervals, and a limiting space is formed between the first steel bar and the second steel bar;

[0088] After coating and curing the protective glue on the second vertical surface exposed outside the through hole on the back of the first fixture, the method further includes:

[0089] Place the first fixture in the limiting space, tear off the bottom glue on the front of the first fixture, and use the discharging machine to separate the painted PPTC component on the first fixture from the first fixture.

[0090] In some embodiments, the surface coating device of the surface-mounted PPTC component further includes a face-changing machine. The side surface of the PPTC component to be painted includes a first side surface and a second side surface. The method includes:

[0091] After the first side of the PPTC component to be painted fixed in the second jig has been coated with the protective glue and cured, apply a base glue on the front side of the second jig so that the first side coated with the protective glue adheres to the base glue on the front side of the second jig;

[0092] Tear off the base glue pasted on the reverse side of the second jig;

[0093] Place the second jig with the reverse side base glue torn off on the surface changer, wherein the front side of the second jig is placed opposite to the surface changer;

[0094] Use the surface changer to move the PPTC component to be painted from the front side of the second jig along the reverse side of the second jig, so that the second side of the PPTC component to be painted is exposed outside the through hole on the reverse side of the second jig;

[0095] Coat and cure the protective glue on the second side exposed outside the through hole on the reverse side of the second jig.

[0096] In some embodiments, the surface coating device for the patch PPTC component further includes a unloading machine, the unloading machine is provided with a first steel bar and a second steel bar, the first steel bar and the second steel bar are arranged relatively at intervals, and a limiting space is formed between the first steel bar and the second steel bar;

[0097] After coating and curing the protective glue on the second side exposed outside the through hole on the reverse side of the second jig, the method further includes:

[0098] Place the second jig in the limiting space, tear off the base glue on the front side of the second jig, and use the unloading machine to unload the painted PPTC component on the second jig into the accommodating space of the unloading machine.

[0099] In some embodiments, the surface coating device for the PPTC component further includes a vibrating feeder, and loading the plurality of PPTC components to be painted into the plurality of through holes of the jig includes:

[0100] Use the vibrating feeder to vibrate and load a plurality of PPTC components to be painted into the plurality of through holes of the jig.

[0101] In some embodiments, the surface coating device for the PPTC component further includes a guiding plate, and loading the plurality of PPTC components to be painted into the plurality of through holes of the jig by using the vibrating feeder includes:

[0102] Stack the guiding plate on the front side of the jig;

[0103] Place the jig with the guiding plate stacked on it on the vibrating feeder;

[0104] Pour a plurality of the PPTC components to be coated onto the said introduction plate, and utilize the vibration of the said vibration feeder to load the plurality of the PPTC components to be coated into a plurality of through holes of the said jig.

[0105] It should be noted that the first vertical surface is the same as the second vertical surface, and the first side surface is the same as the second side surface. The coating sequence of the vertical surface and the side surface can be selected according to the actual situation, and the present application does not limit it here.

[0106] Based on the above embodiments, in combination with Figure 2 and Figure 3 , the present application takes the coating sequence of the first vertical surface, the second vertical surface, the first side surface and the second side surface as an example for illustration. Specifically, the following process can be referred to:

[0107] 1. Adjust the viscosity of the protective glue, and evenly spread the protective glue on the slurry platform of the automatic capping machine.

[0108] Among them, the automatic capping machine can be used to automatically brush the protective glue evenly.

[0109] 2. Use a pasting machine to paste the bottom glue on the reverse side of the first jig (such as the jig ① in Figure 3 ).

[0110] 3. Stack the introduction plate on the front of the first jig, place the first jig stacked with the introduction plate on the vibration feeder, and pour a batch of PPTC components to be coated onto the introduction plate.

[0111] Among them, when the first jig is placed on the vibration feeder, the introduction plate faces upward.

[0112] 4. Use the vibration feeder to vibrate and load a batch of PPTC components to be coated into the through holes of the first jig, and initially adhere them to the bottom glue on the first jig.

[0113] Among them, when the PPTC components to be coated are loaded into the through holes of the first jig, the first vertical surface faces upward.

[0114] 5. Use a leveling machine to flatten the PPTC components to be coated in the first jig, keep the heights of the first vertical surfaces facing upward basically the same, and strengthen the adhesion effect between the second vertical surface of the PPTC components to be coated and the bottom glue, so as to prevent the second vertical surface of the PPTC components to be coated from falling off the bottom glue on the first jig.

[0115] 6. Place the leveled first jig on the automatic capping machine, and use the automatic capping machine to dip an appropriate amount of protective glue for the PPTC components to be coated fixed in the first jig.

[0116] Among them, when the first jig is placed on the automatic capping machine, the first vertical surface faces downward so that the first vertical surface can complete the coating of the protective glue.

[0117] 7. Place the first fixture that has completed the coating of the first side in the material cage, and place the material cage in the automatic drying oven to wait for the protective glue coated on the first side to be baked and cured.

[0118] 8. Use a gluing machine to stick the base glue on the front of the first fixture.

[0119] That is, stick the base glue on the already coated and cured first side of the PPTC component to be coated, so that the first side is initially adhered to the base glue on the front of the first fixture.

[0120] 9. Tear off the base glue stuck on the reverse side of the first fixture; and place the first fixture with the reverse side base glue torn off in the surface-changing machine, where the front of the first fixture is placed opposite to the surface-changing machine; use the surface-changing machine to move the PPTC component to be coated from the front of the first fixture along the reverse side of the first fixture, so that the second side of the PPTC component to be coated is exposed outside the through hole on the reverse side of the first fixture.

[0121] 10. Use a leveling machine to flatten the PPTC component to be coated in the first fixture, keep the heights of the second sides facing up basically the same, and strengthen the adhesion effect between the first side of the PPTC component to be coated and the base glue, to prevent the first side of the PPTC component to be coated from falling off the base glue on the first fixture.

[0122] 11. Place the leveled first fixture on the automatic capping machine, and use the automatic capping machine to dip an appropriate amount of protective glue for the PPTC component fixed in the first fixture.

[0123] Among them, when the first fixture is placed on the automatic capping machine, the second side faces downwards so that the second side is coated with the protective glue.

[0124] 12. Place the first fixture that has completed the coating of the second side in the material cage, and place the material cage in the automatic drying oven to wait for the protective glue coated on the second side to be cured.

[0125] 13. Place the first fixture after the second side is cured on the unloading machine, tear off the base glue on the front of the first fixture, and use the unloading machine to separate the PPTC component with two sides coated on the first fixture from the first fixture.

[0126] 14. Use a gluing machine to stick the base glue on the reverse side of the second fixture (such as Figure 3 fixture ② in

[0127] 15. Use a vibrating feeder to vibrate and batch load the PPTC components to be coated with two sides into multiple through holes of the second fixture.

[0128] Among them, the PPTC component to be painted in the second fixture is also facing upward in a vertical plane.

[0129] 16. Use a push-down machine to push down and level the PPTC component to be painted loaded into the second fixture, so as to change the posture of the PPTC component to be painted from facing upward in a vertical plane to facing upward in a side plane.

[0130] Among them, it can be the first side facing upward, and the second side is adhered to the bottom glue of the second fixture.

[0131] 17. Place the leveled second fixture on an automatic capping machine, and use the automatic capping machine to dip an appropriate amount of protective glue on the PPTC component to be painted fixed in the second fixture.

[0132] Among them, when the second fixture is placed on the automatic capping machine, the first side faces downward so that the first side can be coated with the protective glue.

[0133] 18. Place the second fixture after the first side is coated in a material cage, and place the material cage in an automatic drying furnace to wait for the protective glue coated on the first side to be baked and cured.

[0134] 19. Use a face-changing machine to turn over and change the face of the second fixture to complete the coating and curing of the second side of the PPTC component to be painted in the second fixture.

[0135] 20. Place the second fixture after the two sides are cured on a discharging machine for discharging.

[0136] Among them, for steps 19 and 20, the specific coating and curing operations can refer to the operations of coating and curing the opposite side described above.

[0137] In this way, the surface coating method of the PPTC component provided by this application only needs to coat the protective glue on the vertical and side surfaces of the PPTC component, and the operation processes are all implemented by machines, and manual labor only needs to transfer the PPTC component. Therefore, the coating efficiency of the PPTC component can be improved;

[0138] Moreover, the fixture provided by this application has relatively high versatility and is convenient for switching PPTC components of different models.

[0139] In the above embodiments, the descriptions of each embodiment have their own focuses. For parts not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0140] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present application.

[0141] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality of" means two or more unless otherwise specifically defined.

[0142] In the present application, unless otherwise clearly specified and defined, the terms such as "mounted", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it may be a connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0143] In the present application, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the horizontal height of the first feature is lower than that of the second feature.

[0144] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic expressions of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0145] Obviously, those skilled in the art can make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, provided that these modifications and variations of this application fall within the scope of the claims of this application and their equivalent technologies, this application also intends to include these changes and modifications therein.

[0146] As described above, the above is only the specific implementation manner of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art within the technical scope disclosed by this application can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered by the protection scope of this application. Therefore, the protection scope of this application shall be subject to the protection scope of the claims.

Claims

1. A surface coating method for a PPTC component, characterized in that: The surface coating equipment of the PPTC component includes a jig, a glue sticking machine and an automatic terminal sealing machine, the jig is provided with a plurality of through holes, and the method includes: Using the glue sticking machine to stick the base glue on the reverse side of the jig; Installing a plurality of PPTC components to be coated into a plurality of through holes of the jig and adhering them to the base glue of the jig, wherein the PPTC components to be coated correspond to the through holes one by one; The jig fixed with the PPTC component to be coated is placed on the automatic terminal sealing machine covered with protective glue, and the PPTC component to be coated fixed in the jig is coated with protective glue by using the automatic terminal sealing machine.

2. The method according to claim 1, characterized in that: The PPTC component to be coated includes a vertical surface and a side surface, and the jig includes a first jig and a second jig, wherein the through hole length of the second jig is greater than the through hole length of the first jig, and the through hole length of the second jig is greater than the sum of the lengths of the vertical surface and the side surface of the PPTC component to be coated; The method of installing a plurality of PPTC components to be coated into a plurality of through holes of the fixture and adhering them to the base glue of the fixture comprises: If the vertical surface of the PPTC component to be coated is coated, a plurality of the PPTC components to be coated are installed into a plurality of through holes of the first fixture and adhered to the base glue of the first fixture; If the side surface of the PPTC component to be coated is coated, a plurality of the PPTC components to be coated are installed into a plurality of through holes of the second fixture and adhered to the base glue of the second fixture.

3. The method according to claim 2, characterized in that The surface coating equipment of the patch PPTC component also includes a leveler and a pusher. After the plurality of PPTC components to be coated are loaded into the plurality of through holes of the fixture, the method further includes: If the vertical surface of the PPTC component to be coated is to be coated, the PPTC component to be coated loaded into the jig is flattened by the flattening machine; If the side of the PPTC component to be coated is to be coated, the PPTC component to be coated loaded into the jig is pushed down and leveled by the push-down machine.

4. The method according to claim 1, characterized in that: The surface coating equipment of the patch PPTC component also includes an automatic drying oven. After the PPTC component to be coated fixed in the fixture is coated with protective glue by the automatic terminal sealing machine, the method also includes: The coated PPTC component to be coated and fixed in the fixture is placed in the automatic drying oven, and the protective glue on the surface of the PPTC component to be coated is cured by the automatic drying oven.

5. The method according to claim 2, characterized in that: The surface coating equipment of the patch PPTC component also includes a face changing machine, the facade of the PPTC component to be coated includes a first facade and a second facade, and the method includes: When the first vertical surface of the PPTC component to be coated fixed in the first fixture has been coated with protective glue and cured, a primer is attached to the front side of the first fixture so that the first vertical surface coated with protective glue is adhered to the primer on the front side of the first fixture; Remove the base glue on the back side of the first jig; Placing the first jig with the back side glue removed on the face changing machine, wherein the front side of the first jig is placed opposite to the face changing machine; Using the face-changing machine, the PPTC component to be coated is moved from the front side of the first jig along the back side of the first jig, so that the second vertical surface of the PPTC component to be coated is exposed outside the through hole on the back side of the first jig; The second facade exposed outside the through hole on the reverse side of the first fixture is coated with protective glue and cured.

6. The method according to claim 5, characterized in that The surface coating equipment of the patch PPTC component also includes a discharger, the discharger is provided with a first steel bar and a second steel bar, the first steel bar and the second steel bar are arranged relatively spaced apart, and a limiting space is formed between the first steel bar and the second steel bar; After coating and curing the second facade exposed outside the through hole on the reverse side of the first fixture with protective glue, the method further includes: The first jig is placed in the limiting space, the base glue on the front of the first jig is torn off, and the PPTC component coated on the first jig is separated from the first jig by using the unloader.

7. The method according to claim 2, characterized in that: The surface coating equipment of the patch PPTC component also includes a surface changing machine, the side of the PPTC component to be coated includes a first side and a second side, and the method includes: When the first side of the PPTC component to be coated fixed in the second fixture has been coated with protective glue and cured, a primer is attached to the front side of the second fixture so that the first side coated with protective glue is adhered to the primer on the front side of the second fixture; Remove the base glue on the back side of the second jig; Placing the second jig with the back side glue removed on the face changing machine, wherein the front side of the second jig is placed opposite to the face changing machine; Using the face-changing machine, the PPTC component to be coated is moved from the front side of the second jig along the back side of the second jig, so that the second side surface of the PPTC component to be coated is exposed outside the through hole on the back side of the second jig; The second side surface exposed outside the through hole on the reverse side of the second fixture is coated with protective glue and cured.

8. The method according to claim 7, characterized in that The surface coating equipment of the patch PPTC component also includes a discharger, the discharger is provided with a first steel bar and a second steel bar, the first steel bar and the second steel bar are arranged relatively spaced apart, and a limiting space is formed between the first steel bar and the second steel bar; After coating and curing the second side surface exposed outside the through hole on the reverse side of the second fixture with protective glue, the method further includes: The second jig is placed in the limiting space, the base glue on the front of the second jig is torn off, and the PPTC component coated on the second jig is unloaded into the accommodation space of the unloader by using the unloader.

9. The method according to claim 1, characterized in that: The surface coating equipment of the PPTC component further includes a vibrating feeder, which loads a plurality of PPTC components to be coated into a plurality of through holes of the fixture, including: The vibrating feeder is used to vibrate a plurality of PPTC components to be coated into a plurality of through holes of the fixture.

10. The method according to claim 9, characterized in that The surface coating equipment of the PPTC component further includes an introduction plate, and the vibration feeding machine is used to vibrate and load a plurality of PPTC components to be coated into a plurality of through holes of the fixture, including: Overlaying the introduction plate on the front side of the jig; Placing the jig stacked with the introduction plate on the vibrating feeder; A plurality of the PPTC components to be coated are poured into the introduction plate, and the plurality of the PPTC components to be coated are loaded into the plurality of through holes of the jig by utilizing the vibration of the vibration feeder.

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