Heating pad and welding die
By setting a wrapping layer between the heating pad's cable and the encapsulation layer and performing high-frequency welding to form a multi-layer sealed structure, the problem of water seepage in the heating pad under humid conditions is solved, achieving a better waterproof effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-26
- Publication Date
- 2026-03-20
AI Technical Summary
Existing heating pads are not waterproof in humid environments and are prone to water leakage.
An encapsulation layer is placed between the heating pad's cable and the encapsulation layer, and multiple layers are sealed using a high-frequency welding mold to form multiple sealing rings to improve sealing and durability.
It significantly improves the waterproof performance and overall sealing of the heating pad, preventing water leakage.
Smart Images
Figure CN224021890U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to heating product technical field, especially relate to a heating pad and welding mould. BACKGROUND
[0002] The heating pad is a kind of commonly used heating material placed in the bottom of the heated object, generally for surface heating body, inside is heating body, outside is packaged with plastic, rubber or fabric etc.The common heating pad includes electric blanket, yoga mat, heating table pad etc., and heating pad often appears in the form of ultra-thin, and the thickness is generally 1-5 millimeters.Because the diameter of the wire used in heating pad is much smaller than the diameter of the commonly used wire, the waterproof effect of the structure of wiring packaging is not good.After long time use in humid place, internal water seepage often occurs. SUMMARY
[0003] The technical purpose of the utility model is to provide a kind of heating pad, to solve the problem of poor waterproof effect of heating pad.The heating pad described in this paper is further provided with a wrapping layer between cable and packaging layer, and in one embodiment, the outer periphery of the cable of the heating pad and the heating body is formed into multiple sealing rings, thereby significantly improving the sealing and firmness of the heating pad.
[0004] To solve the above technical problems, in the first aspect, the utility model provides a kind of heating pad, the heating pad includes:
[0005] Heating body;
[0006] Packaging layer, including the first packaging layer and the second packaging layer connected, the heating body is sealed between the first packaging layer and the second packaging layer;
[0007] Cable, electrically connected with the heating body, and at least part of the cable is located between the first packaging layer and the second packaging layer;
[0008] Wrapping layer, at least one circle of the cable is wrapped, and is sealed with the packaging layer Connection.
[0009] Further, the thickness of the wrapping layer is less than the thickness of the packaging layer.
[0010] Further, the first packaging layer includes the first packaging part and the second packaging part connected, the cross section of the second packaging part is arc-shaped, to form first accommodating groove, and the cable is at least partially located in the first accommodating groove;
[0011] The second packaging layer includes the third packaging part and the fourth packaging part connected, the cross section of the fourth packaging part is arc-shaped, to form second accommodating groove, and the cable is at least partially located in the second accommodating groove;
[0012] The second encapsulation part and the fourth encapsulation part are sealed and connected, and the encapsulation part formed by the second encapsulation part and the fourth encapsulation part wraps the cable line once.
[0013] Further, the second encapsulation part comprises a first protruding part, and the first protruding part is located outside the first encapsulation part.
[0014] The fourth encapsulation part comprises a second protruding part, and the second protruding part is located outside the third encapsulation part.
[0015] The first protruding part and the second protruding part are sealed and connected to form a protruding part, and the protruding part is provided with a plurality of sealing rings which are uniformly arranged in the axial direction of the cable line.
[0016] Further, the first encapsulation part and the second encapsulation part are made of the same material.
[0017] The third encapsulation part and the fourth encapsulation part are made of the same material.
[0018] The first encapsulation layer and the second encapsulation layer are made of the same material.
[0019] Further, the first encapsulation part, the second encapsulation part, the third encapsulation part and the fourth encapsulation part are all made of polyvinyl chloride rubber.
[0020] Further, the first encapsulation part and the second encapsulation part are integrally formed.
[0021] The third encapsulation part and the fourth encapsulation part are integrally formed.
[0022] Further, the heating body is at least one of an electric heating wire, a metal sheet and a heating film.
[0023] In the second aspect, the utility model provides a kind of welding mould, and welding mould includes first mould and second mould, and the welding mould is used to carry out high frequency welding and press bonding to the wiring structure of the heating pad described in any one of the above;The first mould and the second mould abut and form hollow welding die cavity, for accommodating the wiring structure of the heating pad.In high frequency welding to the heating pad, the heating pad can be placed on the first mould, the second mould is close to the first mould, until the first encapsulation layer and the second encapsulation layer of the heating pad are pre-pressed tightly.
[0024] Further, the first mould is provided with first welding groove, the first welding groove is used to accommodate the first protruding part of the heating pad, and a plurality of uniformly arranged first protrusions are arranged in the first welding groove.
[0025] The second mold is provided with a second welding groove for accommodating the second protruding part of the heating pad, and a plurality of second protrusions are uniformly arranged in the second welding groove;
[0026] When the first mold and the second mold abut against each other, the first protrusions and the second protrusions are connected to form annular protrusions, and annular grooves are formed between adjacent annular protrusions.
[0027] The utility model discloses a heating pad, including heating body, encapsulation layer, cable and wrapping layer, and encapsulation layer includes first encapsulation layer and second encapsulation layer that link to each other, and heating body is sealed between first encapsulation layer and second encapsulation layer. Cable is electrically connected with heating body, and at least part cable is located between first encapsulation layer and second encapsulation layer. The wrapping layer is wrapped at least one round cable, and is sealedly connected with encapsulation layer. The utility model discloses heating body is sealed in encapsulation layer, and the cable connected with heating body is wrapped with wrapping layer, and wrapping layer is sealedly connected with encapsulation layer, can improve the sealing property and firmness of heating pad, and then improve the waterproof performance of heating pad, prevent the seepage condition of heating pad. BRIEF DESCRIPTION OF DRAWINGS
[0028] Figure 1 It is the overall structure schematic diagram of heating pad in the utility model embodiment;
[0029] Figure 2 It is Figure 1 The sectional view of A-A line in;
[0030] Figure 3 It is the structure schematic diagram of protruding part in the utility model embodiment;
[0031] Figure 4 It is the overall structure schematic diagram of welding mold in the utility model embodiment;
[0032] Figure 5 It is the structure schematic diagram of first mold in the utility model embodiment;
[0033] Figure 6 It is the structure schematic diagram of second mold in the utility model embodiment.
[0034] In the accompanying drawings, the reference numerals denote: 1, encapsulation layer; 101, first encapsulation layer; 1011, first encapsulation portion; 11, second encapsulation portion; 111, first receiving groove; 112, first protruding portion; 102, second encapsulation layer; 1101, encapsulation portion; 1021, third encapsulation portion; 12, sealing ring; 13, fourth encapsulation portion; 131, second receiving groove; 132, second protruding portion; 1102, protruding portion; 2, wrapping layer; 3, cable; 4, welding mold; 41, first mold; 411, first welding groove; 412, first protrusion; 42, second mold; 421, second welding groove; 422, second protrusion. Detailed Implementation
[0035] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.
[0036] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "circumferential", "radial", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.
[0038] Heating pads are often ultra-thin, typically 1-5 mm thick. Because their diameter is much smaller than that of commonly used electrical wires, the waterproofing of the wiring enclosure is poor. After prolonged use in humid environments, internal water seepage often occurs.
[0039] To address the aforementioned technical problems, this utility model proposes a heating pad.
[0040] Figure 1 This is a schematic diagram of the overall structure of the heating pad in an embodiment of this utility model. Figure 2 yes Figure 1 Cross-sectional view along line AA. (From the attached...) Figures 1-2 As can be seen from the figure, the heating pad includes a heating element (not shown in the figure), an encapsulation layer 1, a cable 3, and a wrapping layer 2.
[0041] The heating element is the main component of the heating pad that generates heat. In some embodiments, the heating element is at least one of a heating wire, a metal sheet, and a heating film. Heating wires, metal sheets, and heating films have good thermal conductivity, and graphene heating films are preferred. When energized, the heating element converts electrical energy into heat energy, thereby raising the overall temperature of the heating pad.
[0042] The encapsulation layer 1 includes a first encapsulation layer 101 and a second encapsulation layer 102 connected together, with the heating element sealed between the first encapsulation layer 101 and the second encapsulation layer 102. The first encapsulation layer 101 and the second encapsulation layer 102 facilitate the placement of the heating element within the encapsulation layer 1. By placing the heating element between the first encapsulation layer 101 and the second encapsulation layer 102 and sealing the perimeter of the first encapsulation layer 101 and the second encapsulation layer 102, the heating element can be encapsulated within the encapsulation layer 1, achieving a sealed and waterproof design.
[0043] Cable 3 is electrically connected to the heating element. One end of cable 3 is connected to the heating element, and the other end can be connected to an external power source to provide power to the heating element. At least a portion of cable 3 is located between the first encapsulation layer 101 and the second encapsulation layer 102, that is, a portion of cable 3 extends into the encapsulation layer 1 to facilitate connection with the heating element. In this way, the entire heating element is located within the encapsulation layer 1, which provides electrical insulation and mechanical protection for the heating element. In addition, because a portion of cable 3 is located between the first encapsulation layer 101 and the second encapsulation layer 102, it prevents the cable ends from being exposed, thus preventing leakage.
[0044] The sheathing layer 2 wraps around the cable 3 at least once and is sealed to the encapsulation layer 1. Sealing the heating element and cable 3 with the encapsulation layer 1, and further sealing the cable 3 with the sheathing layer 2, improves the sealing performance of the heating pad. A sealed connection means there are no gaps at the joint between the two objects. Exemplarily, the encapsulation layer 1 and the sheathing layer 2 are wrapped around the cable 3, with the outer peripheral surface of the sheathing layer 2 connected to the encapsulation layer 1, and the connection between the outer peripheral surface of the sheathing layer 2 and the encapsulation layer 1 is seamless, thus sealing the cable 3 and the heating element, preventing them from communicating or contacting with external air / water.
[0045] It can be known by the above embodiment that the heating body is sealed in the packaging layer 1, and the cable 3 connected with the heating body is wrapped with the wrapping layer 2, the wrapping layer 2 is sealingly connected with the packaging layer 1, the sealing property of the heating pad can be improved, the waterproof property of the heating pad is further improved, and the water seepage of the heating pad is prevented.
[0046] In some embodiments, the thickness of the wrapping layer 2 is less than the thickness of the packaging layer 1. In the manufacturing process of the heating pad, the wrapping layer 2 wraps the cable 3 at least one time, then the wrapped cable 3 is placed between the first packaging layer 101 and the second packaging layer 102, and then the first packaging layer 101, the second packaging layer 102 and the wrapping layer 2 are high-frequency welded by using the welding mold 4, so that the structure formed by the first packaging layer 101, the second packaging layer 102 and the wrapping layer 2 is all-around double-layer sealed to the cable 3, that is, the cable 3 is 360-degree one-week welded and sealed. Since the thickness of the wrapping layer 2 is less than the thickness of the packaging layer 1, in the high-frequency welding process, the wrapping layer 2 melts first and penetrates into each corner gap between the first packaging layer 101 and the second packaging layer 102, so that the wrapping layer 2 is sealingly connected with the packaging layer 1. Then the first packaging layer 101 and the second packaging layer 102 melt again, and the first packaging layer 101 and the second packaging layer 102 are sealingly connected, so that the structure formed by the first packaging layer 101, the second packaging layer 102 and the wrapping layer 2 is all-around double-layer sealed to the cable 3.
[0047] As shown in the accompanying drawings, Figure 2 In some embodiments, the first packaging layer 101 comprises a first packaging part 1011 and a second packaging part 11 connected with each other, the second packaging part 11 is arc-shaped in cross section to form a first accommodating groove 111, and the cable 3 is at least partially located in the first accommodating groove 111. The shape of the second packaging part 11 is more suitable for the shape of the cable 3, and the second packaging part 11 can be in closer contact with the wrapping layer 2 wrapped on the cable 3 during high-frequency welding, so that the welding is better.
[0048] The second packaging layer 102 comprises a third packaging part 1021 and a fourth packaging part 13 connected with each other, the third packaging part 1021 is arc-shaped in cross section to form a second accommodating groove 131, and the cable 3 is at least partially located in the second accommodating groove 131. Similarly, the shape of the fourth packaging part 13 is more suitable for the shape of the cable 3, and the fourth packaging part 13 can be in closer contact with the wrapping layer 2 wrapped on the cable 3 during high-frequency welding, so that the welding is better.
[0049] When the second encapsulation part 11 and the fourth encapsulation part 13 are sealed together, the encapsulation part 1101 formed by the second encapsulation part 11 and the fourth encapsulation part 13 wraps around the cable 3, thereby sealing the cable 3 through the encapsulation layer 1 and preventing external water from entering between the cable 3 and the encapsulation layer 1. For example, the first encapsulation part 1011 and the third encapsulation part 1021 are flat, so that the first encapsulation part 1011 and the second encapsulation part 11 can be better welded during high-frequency welding.
[0050] As attached Figure 3 As shown, in some embodiments, to improve the sealing performance of the heating pad, the second encapsulation portion 11 includes a first protruding portion 112, which is located outside the first encapsulation portion 1011. The fourth encapsulation portion 13 includes a second protruding portion 132, which is located outside the third encapsulation portion 1021. The first protruding portion 112 and the second protruding portion 132 are sealed together to form a protrusion 1102. The protrusion 1102 can seal the portion of the cable 3 that extends out of the encapsulation layer 1, thereby improving the sealing performance between the encapsulation layer 1 and the cable 3, and thus improving the overall sealing performance of the heating pad.
[0051] Cable 3 is led out from the side of the heating pad. The first protruding part 112, the second protruding part 132 are fused with cable 3 and the wrapping layer 2 that wraps cable 3 by high-frequency pressing to form a multi-layer sealing structure and improve the sealing and waterproof effect.
[0052] The protrusion 1102 is provided with multiple sealing rings 12, which are evenly distributed along the axial direction of the cable 3. The sealing rings 12 can further improve the sealing performance of the protrusion 1102 to the cable 3. The welding mold 4 is provided with multiple protrusions, which surround the cable 3, and there is an annular groove between two adjacent protrusions. During high-frequency welding of the encapsulation layer 1, the welding mold 4 presses the first protrusion 112 and the second protrusion 132, and the protrusions squeeze the protrusion 1102, causing the protrusion 1102 and the corresponding encapsulation layer 2 to deform, forming a dense sealing ring 12 in the annular groove, thereby improving the sealing performance of the protrusion 1102 to the cable 3. The protrusions include a first protrusion 412 and a second protrusion 422. The sealing ring 12 makes the connection between the encapsulation layer 1 and the cable 3 more secure, and the cable 3 is less likely to slip relative to the encapsulation layer 1, thus improving the overall structural strength of the heating pad. On the other hand, the wrapping layer 2 surrounding the cable 3 is squeezed in the molten state and will gather at the sealing ring 12 to form a dense ring, thereby greatly improving the waterproof performance.
[0053] In some embodiments, the first and second encapsulating portions 1011 and 11 are made of the same material, the third and fourth encapsulating portions 1021 and 13 are made of the same material, and the first and second encapsulating layers 101 and 102 are made of the same material. In this way, when the first encapsulating layer 101 is made, the first and second encapsulating portions 1011 and 11 can be better connected, especially when the first and second encapsulating portions 1011 and 11 are integrally formed. When the second encapsulating layer 102 is made, the third and fourth encapsulating portions 1021 and 13 can be better connected, especially when the third and fourth encapsulating portions 1021 and 13 are integrally formed. When high-frequency welding is performed, the first and second encapsulating layers 101 and 102 can be better welded.
[0054] In some embodiments, the first, second, third, and fourth encapsulating portions 1011, 11, 1021, and 13 are all made of PVC rubber. It is a thermoplastic elastomer material with PVC as the main component. It combines the properties of plastic and rubber, exhibiting unique physical and chemical properties. PVC rubber has good elasticity and flexibility, as well as high tensile strength and wear resistance. In addition, it also has excellent weather resistance, chemical corrosion resistance, and water resistance. The first, second, third, and fourth encapsulating portions 1011, 11, 1021, and 13 are made of the same material as the PVC rubber commonly used in cable 3. The welding of PVC rubber material is generally achieved using a high-frequency welding machine, which works on the principle of using the increased polarity of PVC molecular structure to generate internal friction and heat until melting.
[0055] For example, due to differences in production and formulation of PVC rubber, there can be significant differences in thickness, and sometimes the PVC rubber material of the encapsulating layer 1 melts, but the PVC rubber material of the cable 3 does not melt. Alternatively, the PVC rubber material of the cable 3 melts, and the PVC rubber material of the encapsulating layer 1 has been damaged by heat. Therefore, at least one wrapping layer 2 is wrapped between the encapsulating layer 1 and the cable 3 as a transition. The wrapping layer 2 is made of PVC rubber, and the thickness of the PVC rubber of the wrapping layer 2 is smaller than that of the encapsulating layer 1. When wrapping, the length of the wrapping layer 2 is extended to more than twice its original length by pulling it hard, making the wrapping layer 2 thinner, and then wrapping it around the cable 3 for 1-3 turns to form a transition layer. In a high-frequency environment, the PVC molecules in the PVC rubber film of the wrapping layer 2 generate intense molecular friction, and under the action of pretension, they melt first and penetrate into the gaps at all corners of the sandwich, achieving a perfect sealing effect. The thickness of the wrapping layer 2 is lower than that of the PVC rubber layers of the encapsulating layer 1 and the cable 3, so that when the PVC rubber of the wrapping layer 2 penetrates into the gaps at all corners of the sandwich, the PVC rubber materials of the encapsulating layer 1 and the cable 3 will not be damaged by heat.
[0056] Exemplarily, the encapsulation layer 1 is a PVC rubber film, and the manufacturer is Changzhou Wujin Baixing Plastic Products Co., Ltd. The encapsulation layer 1 has a width of 580 mm, a thickness of 0.40 mm, and a yellow cloth pattern. The material of the encapsulation layer 1 is PVC rubber. The cable 3 is produced by Ningbo Gonguan Cable Co., Ltd., and has a model of 2*2.5 square millimeters of RVV cable 3. The wrapping layer 2 is produced by Dongguan Changkai Plastic Products Co., Ltd., and is a PVC transparent film with a thickness of 0.08 mm. The graphene heating film used by the heating body is a customized graphene heating film produced by Ningbo Wencai Neng Technology Co., Ltd.
[0057] In some embodiments, the first encapsulation part 1011 and the second encapsulation part 11 are integrally formed, so that the first encapsulation part 1011 and the second encapsulation part 11 can be tightly connected. The third encapsulation part 1021 and the fourth encapsulation part 13 are integrally formed, so that the third encapsulation part 1021 and the fourth encapsulation part 13 can be tightly connected.
[0058] As shown in the accompanying Figures 4-6 As shown in the accompanying
[0059] In this document, the wiring structure of the heating pad can include: a cable 3, one end of the cable is connected to the heating body, and the other end extends a certain distance away from the heating pad; a wrapping layer 2, the wrapping layer 2 is arranged around the outer periphery of the cable 3, one end of the wrapping layer 2 is close to the heating body, and the other end extends a first length away from the heating pad; an encapsulation layer 1, the encapsulation layer 1 is arranged around the outer periphery of the wrapping layer 2, one end of the encapsulation layer 1 seals the heating body, and the other end extends a second length away from the heating pad. In one specific embodiment, the first length is less than or equal to the second length. As shown in the accompanying Figures 5-6As shown, in some embodiments, the first mold 41 is provided with a first welding groove 411 for accommodating the first protruding portion 112 of the heating pad, and a plurality of first protrusions 412 are uniformly arranged in the first welding groove 411. The second mold 42 is provided with a second welding groove 421 for accommodating the second protruding portion 132 of the heating pad, and a plurality of second protrusions 422 are uniformly arranged in the second welding groove 421. When the first mold 41 and the second mold 42 abut, the first protrusions 412 and the second protrusions 422 are connected to form annular protrusions. The annular recesses (not labeled in the figure) are between two adjacent annular protrusions. When the packaging layer 1 is subjected to high-frequency welding, the welding mold 4 compresses the first protruding portion 112 and the second protruding portion 132, and the annular protrusions extrude the protruding portion 1102, so that the protruding portion 1102 is deformed in the annular recess to form a dense sealing ring 12, thereby improving the sealing performance of the protruding portion 1102 to the cable 3.
[0060] Packaging method of heating pad
[0061] As an example, the packaging method of the heating pad described herein includes: step S1: providing a welding mold 4, the welding mold 4 including a first mold 41 and a second mold 42, the first mold 41 and the second mold 42 abutting to form a hollow welding mold cavity; step S2: placing the heating pad wiring structure to be packaged in the welding mold cavity, and applying pressure and high frequency to the heating pad wiring structure until the heating pad wiring structure forms a sealed structure. In one specific embodiment, the heating pad wiring structure includes: a cable 3, one end of the cable 3 being connected to the heating body, and the other end extending a distance away from the heating pad; a wrapping layer 2, the wrapping layer 2 being arranged around the outer periphery of the cable 3, one end of the wrapping layer 2 being close to the heating body, and the other end extending a first length away from the heating pad; a packaging layer 1, the packaging layer 1 being arranged around the outer periphery of the wrapping layer 2, one end of the packaging layer 1 sealing the heating body, and the other end extending a second length away from the heating pad. In one specific embodiment, the first length is less than or equal to the second length.
[0062] In one specific embodiment, in step S2, the applied pressure is 20-100 kg; the high-frequency heating time is 3-8 seconds, and the cooling holding time is 10 seconds. In this embodiment, the cooling holding time refers to the time for the welding mold to cool down. If the pressure of the welding mold is released at a higher temperature, the welding mold and the polyvinyl chloride film will be bonded, so it is necessary to wait for the welding mold to cool down before releasing. In addition, in this embodiment, the high frequency is generated by energization, and the energization current ranges from 5 A to 10 A.
[0063] In one specific embodiment, the wrapping layer 2 is formed on the cable 3 by stretching a polyvinyl chloride (PVC) rubber film to more than twice its initial length and then wrapping it around the cable 3 1-3 times. The wrapping layer 2 is a very thin PVC film with extensibility. After stretching, it is wrapped around the surface of the inner cable 3, while the first encapsulation layer 101 and the second encapsulation layer 102 are still planar PVC films at this time. The welding cavity of the welding mold 4 used for high-frequency welding is circular. It first clamps the first encapsulation layer 101 and the second encapsulation layer 102 from the top and bottom, making the PVC film of the encapsulation layer 1 circular. Then, high frequency is generated by energizing, causing all the molecules of the PVC material to vibrate. Heat is generated through molecular self-vibration and self-friction, thus melting itself. Because of the stretching effect, the randomly arranged PVC molecules in the wrapping layer 2 become somewhat oriented, and are more affected by the high frequency, generating more heat. In addition, because it is thinner, it melts earlier.
[0064] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A heating pad, characterized in that, The heating pad includes: Heating element; The encapsulation layer includes a first encapsulation layer and a second encapsulation layer connected together, and the heating element is sealed between the first encapsulation layer and the second encapsulation layer; A cable is electrically connected to the heating element, and at least a portion of the cable is located between the first encapsulation layer and the second encapsulation layer; The sheathing layer wraps around the cable at least once and is sealed to the encapsulation layer.
2. The heating pad according to claim 1, characterized in that, The thickness of the wrapping layer is less than the thickness of the encapsulation layer.
3. The heating pad according to claim 1, characterized in that, The first encapsulation layer includes a first encapsulation portion and a second encapsulation portion connected together. The cross-section of the second encapsulation portion is arc-shaped to form a first receiving groove, and the cable is at least partially located in the first receiving groove. The second encapsulation layer includes a third encapsulation portion and a fourth encapsulation portion connected together. The cross-section of the fourth encapsulation portion is arc-shaped to form a second receiving groove, and the cable is at least partially located in the second receiving groove. When the second encapsulation part and the fourth encapsulation part are sealed together, the encapsulation part formed by the second encapsulation part and the fourth encapsulation part wraps around the cable.
4. The heating pad according to claim 3, characterized in that, The second encapsulation portion includes a first protruding portion, which is located outside the first encapsulation portion; The fourth encapsulation portion includes a second protruding portion, which is located outside the third encapsulation portion; The first protruding portion and the second protruding portion are sealed together to form a protruding part. The protruding part is provided with a plurality of sealing rings, which are evenly arranged in the protruding part along the axial direction of the cable.
5. The heating pad according to claim 3, characterized in that, The first encapsulation part and the second encapsulation part are made of the same material; The third encapsulation part and the fourth encapsulation part are made of the same material; The first encapsulation layer and the second encapsulation layer are made of the same material.
6. The heating pad according to claim 5, characterized in that, The first encapsulation part, the second encapsulation part, the third encapsulation part, and the fourth encapsulation part are all made of polyvinyl chloride rubber.
7. The heating pad according to claim 5, characterized in that, The first packaging part and the second packaging part are integrally formed; The third packaging part and the fourth packaging part are integrally formed.
8. The heating pad according to any one of claims 1-7, characterized in that, The heating element is at least one of heating wire, metal sheet, and heating film.
9. A welding mold, characterized in that, The welding mold includes a first mold and a second mold, and the welding mold is used to perform high-frequency welding and pressing on the wiring structure of the heating pad according to any one of claims 1-8; When the first mold and the second mold come into contact, they form a hollow welding cavity to accommodate the wiring structure of the heating pad.
10. The welding mold according to claim 9, characterized in that, The first mold is provided with a first welding groove, which is used to accommodate the first protruding part of the heating pad, and the first welding groove is provided with a plurality of evenly arranged first protrusions. The second mold is provided with a second welding groove, which is used to accommodate the second protruding part of the heating pad, and the second welding groove is provided with a plurality of evenly arranged second protrusions; When the first mold and the second mold abut against each other, the first protrusion and the second protrusion connect to form an annular protrusion, and an annular groove is formed between adjacent annular protrusions.