A thermal protector and a manufacturing device of a heating element thereof

Abstract

This utility model relates to a thermal protector and its heating element manufacturing equipment, belonging to the field of thermal protectors. The utility model includes a pin, a cover plate, a moving spring assembly, a bimetallic strip, a first stationary foot, a second stationary foot, a heating element, a third stationary foot assembly, and a base. The pin is disposed on the cover plate. The moving spring assembly, bimetallic strip, first stationary foot, second stationary foot, heating element, and third stationary foot assembly are all disposed within a cavity formed by the cover plate and the base. The two ends of the heating element are welded to the first and second stationary feet, respectively. One end of the moving spring assembly is electrically connected to the first stationary foot, and the other end of the moving spring assembly cooperates with one end of the third stationary foot assembly. The other end of the third stationary foot assembly is electrically connected to the pin. Its structural feature is that the heating element has a planar geometric structure and is formed by bending.

Description

Technical Field

[0001] This utility model relates to a thermal protector and its heating element manufacturing equipment, belonging to the field of thermal protectors, and is mainly used for over-temperature rise and over-current protection of refrigeration compressors or other motors. Background Technology

[0002] Current refrigeration compressors are all equipped with a thermal protector, which is mainly used for over-temperature and over-current protection. Existing thermal protectors consist of a pin assembly, a stationary pin assembly, a moving spring assembly, and a heating element assembly, forming a protective circuit that is electrically connected under normal conditions and disconnected under abnormal conditions. The thermal protector has a heating element and a bimetallic strip. When the refrigerator compressor stalls or the voltage is unstable, the current increases. When the heat generated by the heating element reaches the set operating temperature of the bimetallic strip, the thermal protector will trip and disconnect the electrical circuit. When the thermal protector reaches the set reset temperature, the bimetallic strip will reset and reconnect the electrical circuit.

[0003] Existing thermal protectors have over-temperature rise and over-current protection functions. The heating element 7 plays a very important role. The magnitude of the thermal protector current depends on the resistance value of the heating element. The larger the resistance value, the smaller the current, and the smaller the resistance value, the larger the current. When a spiral heating element is used, the resistance value can be increased but it is difficult to decrease. When a planar heating element is used, the resistance value can be decreased but it is difficult to increase. Both have their advantages and disadvantages.

[0004] The current manufacturing method involves winding wire into a spiral shape and stamping or cutting sheet metal into a flat shape (such as...). Figure 3 , 4 ), spiral heating element (such as Figure 3 As shown, most of the heat generated when current passes through is absorbed by the base 9, extending the protection time, while the planar heating element (such as...) Figure 4 (As shown) Compared to the spiral heating element, less heat is absorbed by the base 9, resulting in a shorter protection time. However, the use of sheet metal stamping or cutting leads to greater material waste and higher costs. Utility Model Content

[0005] The purpose of this utility model is to overcome the above-mentioned deficiencies in the existing technology and to provide a thermal protector with a reasonable structural design and a device for manufacturing its heating element.

[0006] The technical solution adopted by this utility model to solve the above problems is as follows: The thermal protector includes a pin, a cover plate, a moving spring assembly, a bimetallic strip, a stationary foot one, a stationary foot two, a heating element, a stationary foot three assembly, and a base. The pin is disposed on the cover plate. The moving spring assembly, the bimetallic strip, the stationary foot one, the stationary foot two, the heating element, and the stationary foot three assembly are all disposed in the cavity formed by the cover plate and the base. The two ends of the heating element are welded to the stationary foot one and the stationary foot two, respectively. One end of the moving spring assembly is electrically connected to the stationary foot one, and the other end of the moving spring assembly cooperates with one end of the stationary foot three assembly. The other end of the stationary foot three assembly is electrically connected to the pin. Its structural feature is that the heating element is arranged in a planar geometric shape and is formed by bending.

[0007] Furthermore, when the other end of the moving spring assembly contacts one end of the stationary foot three-component assembly, the stationary foot two, the heating element, the stationary foot one, the moving spring assembly, the stationary foot three-component assembly, and the pin are sequentially electrically connected to form an electrical circuit.

[0008] Furthermore, the base is provided with a loading cavity for placing the heating element, and the bottom of the loading cavity is provided with a limiting platform for limiting the height of the heating element.

[0009] Furthermore, the limiting platform is provided with two strip-shaped protrusions.

[0010] Furthermore, the heating element is made of alloy resistance wires of different diameters, such as nickel-chromium, constantan, and iron-chromium, and is bent into m-shaped, U-shaped, S-shaped, and Ω-shaped structures.

[0011] Furthermore, the heating element, bimetallic strip, and moving spring assembly are arranged sequentially from bottom to top.

[0012] Furthermore, another technical objective of this utility model is to provide a device for manufacturing a heating element.

[0013] The above-mentioned technical objective of this utility model is achieved through the following technical solution.

[0014] A manufacturing apparatus for producing a heating element is characterized in that: the manufacturing apparatus includes a conveying mechanism for conveying a heating wire, a bending mechanism for bending the heating wire into a planar geometric structure, and a cutting mechanism for cutting the bent heating wire to form a heating element. The cutting mechanism is located above the bending mechanism, and both the cutting mechanism and the bending mechanism cooperate with the conveying mechanism.

[0015] Furthermore, the conveying mechanism includes a fixed base, a servo motor, a transmission gear set, and a spool assembly. The servo motor, transmission gear set, and spool assembly are all mounted on the fixed base, and the servo motor is connected to the transmission gear set. The servo motor drives the transmission gear set to push the heating wire, and the spool assembly adjusts the heating wire to a flat position.

[0016] Furthermore, the cutting mechanism includes a fixed frame, a cylinder, and scissors. The cylinder barrel is fixed on the fixed frame, and the piston rod of the cylinder is connected to the scissors, which are pushed by the cylinder.

[0017] Furthermore, the bending mechanism includes a fixed plate, a guide wheel assembly, a line positioning seat, a bending needle, a rotating wheel, a second servo motor, and a bending seat. The guide wheel assembly, the line positioning seat, and the bending seat are all mounted on the fixed plate. The line positioning seat is located between the guide wheel assembly and the bending seat. The bending needle is mounted on the bending seat. The bending seat is coaxially connected to the rotating wheel. The rotating wheel is connected to the second servo motor via a belt and a pulley.

[0018] Compared with existing technologies, this utility model has the following advantages: This thermal protector uses a bending process to bend the heating wire into various planar structural shapes such as M-shape, U-shape, S-shape, and Ω-shape, solving the problems of minimizing the resistance value of wire heating elements and maximizing the resistance value of plate heating elements. This is equivalent to expanding the current range and increasing the specifications of thermal protector products with both wire and plate heating elements, which not only meets more market demands but also improves the thermal efficiency response of the thermal protector, thereby better protecting the motor. At the same time, it reduces the loss of raw materials, bringing higher profit value to enterprises. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the thermal protector according to an embodiment of the present invention.

[0020] Figure 2 This is an exploded structural diagram of the thermal protector according to an embodiment of the present invention.

[0021] Figure 3 This is a schematic diagram of the internal structure of a thermal protector (spiral heating element) in the prior art.

[0022] Figure 4 This is a schematic diagram of the internal structure of a thermal protector (planar heating element) in the prior art.

[0023] Figure 5 This is a schematic diagram of the internal structure of the thermal protector according to an embodiment of the present invention.

[0024] Figure 6 This is a three-dimensional structural diagram of the base according to an embodiment of the present utility model.

[0025] Figure 7aThis is a three-dimensional structural diagram of the first heating element according to an embodiment of the present utility model.

[0026] Figure 7b This is a three-dimensional structural diagram of the second type of heating element according to an embodiment of the present invention.

[0027] Figure 7c This is a three-dimensional structural diagram of the third type of heating element in this utility model embodiment.

[0028] Figure 7d This is a three-dimensional structural diagram of the fourth type of heating element according to an embodiment of this utility model.

[0029] Figure 7e This is a three-dimensional structural diagram of the fifth type of heating element in this utility model embodiment.

[0030] Figure 7f This is a three-dimensional structural diagram of the sixth heating element according to an embodiment of the present utility model.

[0031] Figure 8 This is a three-dimensional structural diagram of the heating element manufacturing equipment according to an embodiment of the present invention.

[0032] Figure 9 This is a three-dimensional structural diagram of the conveying mechanism according to an embodiment of the present utility model.

[0033] Figure 10 This is a three-dimensional structural diagram of the cutting mechanism according to an embodiment of the present utility model.

[0034] Figure 11 This is a three-dimensional structural diagram of the bending mechanism according to an embodiment of the present utility model.

[0035] Figure 12 This is a schematic diagram of the connection relationship of the electronic control system according to an embodiment of the present invention.

[0036] In the diagram: Pin 1, Cover plate 2, Moving spring assembly 3, Bimetallic strip 4, Stationary foot 1 5, Stationary foot 2 6, Heating element 7, Stationary foot 3 assembly 8, Base 9, Loading cavity 9-1, Limiting platform 9-2, Conveying mechanism A, Cutting mechanism B, Bending mechanism C, Fixed seat A1, Servo motor 1 A2, Transmission gear set A3, Wire wheel set A4, Fixed frame B1, Cylinder B2, Scissors B3, Fixed plate C1, Wire wheel set C2, Wire positioning seat C3, Bending needle C4, Rotating wheel C5, Servo motor 2 C6, Bending seat C7, Sensor 1 SQ1, Sensor 2 SQ2, Origin sensor SQ3, Sensor 3 SQ4, Sensor 4 SQ5, Start button SQ0, Solenoid valve 1 FB2, Solenoid valve 2 FB3, Programmable controller PLC, Central processing unit CPU, Input interface IN, Output interface OUT, Servo driver 1 SA2, Encoder 1 BM1, Servo driver 2 SC6, Encoder 2 BM2. Detailed Implementation

[0037] The present invention will be further described in detail below with reference to the accompanying drawings and through embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0038] Example

[0039] See Figure 1-2 As shown in Figures 5-12, it should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings of this specification are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the conditions under which this utility model can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model. Furthermore, the use of terms such as "upper," "lower," "left," "right," "middle," and "one" in this specification is only for clarity of description and is not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of implementation of this utility model.

[0040] The thermal protector in this embodiment (such as...) Figure 1-2 As shown in Figures 5-7c, the assembly includes pin 1, cover plate 2, moving spring assembly 3, bimetallic strip 4, stationary foot 1 5, stationary foot 2 6, heating element 7, stationary foot 3 assembly 8, and base 9. Pin 1 is mounted on cover plate 2. Moving spring assembly 3, bimetallic strip 4, stationary foot 1 5, stationary foot 2 6, heating element 7, and stationary foot 3 assembly 8 are all mounted in the cavity formed by cover plate 2 and base 9. Heating element 7, bimetallic strip 4, and moving spring assembly 3 are arranged sequentially from bottom to top.

[0041] The two ends of the heating element 7 are welded to stationary foot 5 and stationary foot 6 respectively. One end of the moving spring assembly 3 is electrically connected to stationary foot 5. The other end of the moving spring assembly 3 is engaged with one end of stationary foot assembly 8 (that is, when the other end of the moving spring assembly 3 is in contact with one end of stationary foot assembly 8, stationary foot 6, heating element 7, stationary foot 5, moving spring assembly 3, stationary foot assembly 8, and pin 1 are electrically connected in sequence to form an electrical circuit). The other end of stationary foot assembly 8 is electrically connected to pin 1. The heating element 7 is arranged in various planar geometric shapes. The heating element 7 is formed by bending. "The heating element 7 is arranged in various planar geometric shapes" means that the axes of each section of the heating wire are in the same plane during the bending process to the heating element 7.

[0042] The base 9 is provided with a loading cavity 9-1 for placing the heating element 7. The bottom of the loading cavity 9-1 is provided with a limiting platform 9-2 for limiting the height of the heating element 7. The limiting platform 9-2 is provided with two strip-shaped protrusions. The heating element 7 is made of alloy resistance wire materials of various diameters such as nickel-chromium, constantan, and iron-chromium, and is bent into other malleable shapes such as m-shaped, U-shaped, S-shaped, and Ω-shaped. The cross-section of the heating element 7 is circular.

[0043] Specifically, the thermal protector is connected to the compressor via the compressor's three-core terminal block. Simply insert pin 1 into the compressor's three-core terminal block; at the same time, the connecting tab of the stationary pin 2 6 is used for power connection; after inserting the starter into the compressor's three-core terminal block and making electrical connection, it can be put into normal use. When the mains voltage is too high or too low or the refrigeration system malfunctions, the bimetallic strip 4 deforms due to heat, pushing the contact of the moving spring assembly 3 away from the contact of the stationary pin assembly 8, and the thermal protector activates, thereby cutting off the above-mentioned protective circuit and protecting the compressor motor.

[0044] Equipment for manufacturing heating elements (such as) Figure 8-11 As shown, it includes a conveying mechanism A for conveying the heating wire, a bending mechanism C for bending the heating wire into a planar geometric structure, and a cutting mechanism B for cutting the bent heating wire to form a heating element 7. The cutting mechanism B is located above the bending mechanism C, and both the cutting mechanism B and the bending mechanism C cooperate with the conveying mechanism A.

[0045] The conveying mechanism A includes a fixed base A1, a servo motor A2, a transmission gear set A3, and a thread-forming wheel set A4. The servo motor A2, the transmission gear set A3, and the thread-forming wheel set A4 are all mounted on the fixed base A1. The servo motor A2 is connected to the transmission gear set A3. The servo motor A2 drives the transmission gear set A3 to push the heating wire. The thread-forming wheel set A4 adjusts the heating wire to be flat. The thread-forming wheel set A4 consists of multiple rotating wheels arranged in upper and lower rows. The two adjacent rotating wheels are staggered. The upper row of rotating wheels is adjusted to loosen and tighten with the lower row of rotating wheels to press the curved wire (i.e., the heating wire) flat.

[0046] The cutting mechanism B includes a fixed frame B1, a cylinder B2, and scissors B3. The cylinder barrel of cylinder B2 is fixed on the fixed frame B1, and the piston rod of cylinder B2 is connected to scissors B3. Scissors B3 is pushed by cylinder B2. Cylinder B2 cooperates with sensor SQ1, sensor SQ2, and solenoid valve FB2. Scissors B3 cooperates with sensor SQ4, sensor SQ5, and solenoid valve FB3.

[0047] The bending mechanism C includes a fixed plate C1, a guide wheel assembly C2, a line positioning seat C3, a bending needle C4, a rotating wheel C5, a second servo motor C6, and a bending seat C7. The guide wheel assembly C2, the line positioning seat C3, and the bending seat C7 are all mounted on the fixed plate C1. The line positioning seat C3 is located between the guide wheel assembly C2 and the bending seat C7. The bending needle C4 is mounted on the bending seat C7. The bending seat C7 is coaxially connected to the rotating wheel C5. The rotating wheel C5 is connected to the second servo motor C6 via a belt and a pulley. The second servo motor C6 works in conjunction with the origin sensor SQ3.

[0048] The manufacturing equipment consists of an electronic control system (such as...) Figure 12 The system is controlled by a servo driver SA2, encoder BM1, servo driver SC6, encoder BM2, start button SQ0, sensor SQ1, sensor SQ2, origin sensor SQ3, sensor SQ4, sensor SQ5, solenoid valve FB2, solenoid valve FB3, and programmable logic controller (PLC) (model FP2SH). The PLC includes a central processing unit (CPU) (model FP2-C2L), an input interface IN (model FP2-X16D2), and an output interface OUT (model FP2-Y16T). Both the input interface IN and the output interface OUT are connected to the CPU.

[0049] The input interface IN is connected to the start button SQ0, sensor 1 SQ1, sensor 2 SQ2, origin sensor SQ3, sensor 3 SQ4, and sensor 4 SQ5 respectively. The output interface OUT is connected to servo driver 1 SA2, servo driver 2 SC6, solenoid valve 1 FB2, and solenoid valve 2 FB3 respectively. Servo driver 1 SA2 is connected to servo motor 1 A2 and encoder 1 BM1 respectively. Servo driver 2 SC6 is connected to servo motor 2 C6 and servo motor 2 C6 respectively.

[0050] The specific connection methods and functions of the electronic control system are as follows:

[0051] The input interface IN receives various switching signals from external sensors and switches, and transmits them to the central processing unit (CPU).

[0052] The input interface IN is configured with X0, X1, X2, X3, X4, X5, and a common terminal COM.

[0053] Connect the X0 end to one end of the start button SQ0 to start the automatic operation of the production equipment.

[0054] X1 is connected to one end of sensor SQ1, which is the lowering (action) position signal of cylinder B2.

[0055] X2 is connected to one end of sensor SQ2, which is the rising (original) position signal of cylinder B2.

[0056] The X3 terminal is connected to one end of the origin sensor SQ3, which is the zero-point position signal of the servo motor C6.

[0057] The X4 terminal is connected to one end of sensor SQ4 (number 3), which is the position signal of the scissors B3 closing (action).

[0058] The X5 terminal connects to one end of sensor SQ5 (number four), which transmits the original (open) position signal of scissors B3.

[0059] The other ends of the start button SQ0, sensor 1 SQ1, sensor 2 SQ2, origin sensor SQ3, sensor 3 SQ4, and sensor 4 SQ5 are all connected to the negative terminal V- of the DC power supply, and the common terminal COM of the input interface IN is connected to the positive terminal V+ of the DC power supply.

[0060] The output interface OUT outputs a switch signal to control the corresponding action.

[0061] The output interface OUT is configured with terminals Y0, Y1, Y2, Y3, Y4, and Y5.

[0062] Y0-Y1: Y0 and Y1 are connected to the PUL and DIR terminals of servo driver SA2, respectively. The positive terminal + of servo driver SA2 is connected to the positive terminal V+ of the DC power supply. The motor line interface UVW and encoder line interface BM of servo driver SA2 are connected to servo motor A2 and encoder BM1, respectively. Closed-loop control is achieved through the operation control of servo motor A2 and the position feedback of encoder BM1 to ensure the precise operation of servo motor A2. Y0 and Y1 output pulse and direction signals, respectively. The PUL terminal of servo driver SA2 receives the pulse signal and controls the rotation angle and speed of servo motor A2. The DIR terminal of servo driver SA2 receives the direction signal and controls the rotation direction of servo motor A2. These rotation states are controlled by the transmission gear set A3 connected to the shaft of servo motor A2 to realize the control of the length, speed and direction of the heating wire push.

[0063] Y2-Y3 terminals: Y2 and Y3 terminals are connected to the PUL and DIR terminals of servo driver SC6, respectively. The positive terminal (+) of servo driver SC6 is connected to the positive terminal (V+) of the DC power supply. The motor line interface (UVW) and encoder line interface (BM) of servo driver SC6 are connected to servo motor C6 and encoder BM2, respectively. Closed-loop control is achieved through the operation control of servo motor C6 and the position feedback of encoder BM2, ensuring the precise operation of servo motor C6. Y2 and Y3 terminals output pulse and direction signals, respectively. The PUL terminal of servo driver SC6... The UL terminal receives pulse signals to control the rotation angle and speed of servo motor C6 off-center. The DIR terminal of servo driver SC6 receives direction signals to control the rotation direction of servo motor C6. These rotation states are mechanically transmitted through pulleys, belts, rotating wheel C5, bending seat C7, and bending needle C4, which are mechanically connected to the shaft of servo motor C6. Finally, the bending needle C4 executes the bending action of the heating wire. The number of pulse signals controls the bending angle, the frequency of the pulse signals controls the bending speed, and the level of the direction signal controls the bending direction.

[0064] Y4 is connected to one end of solenoid valve FB2, controlling the energization and de-energization of solenoid valve FB2.

[0065] The Y5 terminal is connected to one end of the second solenoid valve FB3, controlling the energization and de-energization of the second solenoid valve FB3.

[0066] The other ends of solenoid valves FB2 (number one) and FB3 (number two) are connected to the positive terminal V+ of the DC power supply, and the negative terminal - of the output interface OUT is connected to the negative terminal V- of the DC power supply.

[0067] The central processing unit (CPU) is the core control component of the electronic control system. Its working principle is to receive the input signal from the input interface IN, perform logic control according to the program design requirements, and output the corresponding control signal at the output interface OUT based on the processing result, thereby realizing the automatic control of the heating element 7 manufacturing process.

[0068] Solenoid valve FB2 receives electrical control from Y4 and controls cylinder B2 to perform actions through air circuit switching.

[0069] Solenoid valve FB3 receives electrical control from terminal Y5 and controls scissors B3 to perform actions via air circuit switching.

[0070] Sensor SQ1 is used to detect the descent (action) position of cylinder B2.

[0071] Sensor SQ2 is used to detect the rising (original) position of cylinder B2.

[0072] The origin sensor SQ3 is used for zero-point position detection of servo motor C6.

[0073] Sensor SQ4 is used for detecting the closing (action) position of scissors B3.

[0074] Sensor 4, SQ5, is used for detecting the open (original) position of scissors B3.

[0075] The method for manufacturing the heating element is as follows:

[0076] S1. Based on the shape of the heating element 7, break down the manufacturing steps and set the operating parameters for each manufacturing step. For example, step N1 pushes the heating wire Lmm, step N2 bends it to the left or right at an H angle, and so on.

[0077] S2. Thread the heating wire through the wire assembly A4, the transmission gear assembly A3, the guide wheel assembly C2, the wire positioning seat C3, and the two bending needles C4.

[0078] S3. Press the start button SQ0. The electrical control system will control the production equipment to automatically complete the entire production process according to the program design requirements in the central processing unit (CPU) and the production steps and operating parameters set in S1.

[0079] S4. Servo motor C6 performs a home reset action. The X3 terminal of input interface IN receives a signal from the home sensor SQ3, indicating that servo motor C6 is at the zero position. The X2 terminal of input interface IN receives a signal from sensor SQ2, indicating that cylinder B2 is at its original position. The X4 terminal of input interface IN receives a signal from sensor SQ4, indicating that scissors B3 is at its original position. If all positions are at their original positions, proceed to the next action.

[0080] S5. When the output interface OUT is connected to the control signal at the Y4 terminal, the first solenoid valve FB2 is energized, and the air circuit control cylinder B2 drives the scissors B3 to descend to the corresponding position of the heating wire. After receiving the descent signal from the first sensor SQ1 at the X1 terminal of the input interface IN, the next action control is performed.

[0081] S6. When the output interface OUT connects to the control signal at the Y5 terminal, the second solenoid valve FB3 is energized, and the pneumatic control scissors B3 performs a closing action, cutting off the excess portion of the heating wire. After the input interface IN receives the scissor closing position signal from the fourth sensor SQ5 at the X5 terminal, the output interface OUT disconnects the control signal at the Y5 terminal, the second solenoid valve FB3 is de-energized, and the pneumatic control scissors B3 performs an opening action. After the input interface IN receives the opening position signal from the third sensor SQ4, the next action control is performed.

[0082] S7. When the output interface OUT disconnects the control signal at the Y4 terminal, the first solenoid valve FB2 is de-energized, the air circuit control cylinder B2 drives the scissors B3 to the rising position, and the input interface IN receives the rising position signal from the second sensor SQ2 and then proceeds to the next action control.

[0083] S8. Following the manufacturing steps and operating parameters set in S1, execute step N1. The Y0 and Y1 terminals of the output interface OUT output pulse signals and direction signals respectively. After receiving the signals, the PUL and DIR terminals of the servo driver SA2 cooperate with the servo motor A2 and the encoder BM1 to control the servo motor A2 to operate precisely, driving the transmission gear set A3 to accurately deliver the heating wire according to the set length, speed, and direction.

[0084] S9. Following the manufacturing steps and operating parameters set in S1, execute step N2. The Y2 and Y3 terminals of the output interface OUT output pulse signals and direction signals respectively. After receiving the signals, the PUL and DIR terminals of servo driver SC6 cooperate with servo motor C6 and encoder BM2 to control servo motor C6 to operate precisely. Through mechanical transmission via pulley, belt, rotating wheel C5, bending seat C7, and bending needle C4, the bending action is completed according to the set bending angle and bending direction.

[0085] S10. Repeat steps S8 and S9 according to the decomposed production steps until all production steps are completed.

[0086] S11. After all production steps are completed, servo motor C6 returns to the zero position and runs S5, S6, and S7 to complete the material cutting action.

[0087] S12, the electronic control system detects the original position and zero point position of all actions, thus ending the production cycle of a product.

[0088] The aforementioned equipment and method for manufacturing the heating element are not limited to the heating element 7 in the thermal protector of this embodiment, but can also be applied to the manufacturing of the heating wire in a thermal protector with a constant bimetallic strip snap time, as disclosed in application number 202322010874.2. Figures 7d-7f As shown.

[0089] Furthermore, it should be noted that the specific embodiments described in this specification may differ in the shape and name of their components. The above description is merely illustrative of the structure of this utility model. All equivalent or simple variations made based on the structure, features, and principles described in this utility model are included within the protection scope of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, as long as they do not deviate from the structure of this utility model or exceed the scope defined by the claims, all of which should fall within the protection scope of this utility model.

Claims

1. A thermal protector comprising a pin, a cover plate, a moving spring assembly, a bimetallic strip, a static pin 1, a static pin 2, a heat generating body, a static pin 3 assembly and a base, characterized in that: The heating element (7) is formed by bending and is bent into a planar geometric shape. The cross-section of the heating element (7) is circular. The heating element (7) is made of alloy resistance wire material. The base (9) is provided with a loading cavity (9-1) for placing the heating element (7). The bottom of the loading cavity (9-1) is provided with a limiting platform (9-2) for limiting the height of the heating element (7).

2. The thermal protector of claim 1, wherein: The pin (1) is set on the cover plate (2). The moving spring assembly (3), bimetallic strip (4), stationary foot one (5), stationary foot two (6), heating element (7), and stationary foot three assembly (8) are all set in the cavity formed by the cover plate (2) and the base (9). The two ends of the heating element (7) are welded to stationary foot one (5) and stationary foot two (6) respectively. One end of the moving spring assembly (3) is electrically connected to stationary foot one (5). The other end of the moving spring assembly (3) cooperates with one end of stationary foot three assembly (8). The other end of stationary foot three assembly (8) is electrically connected to the pin (1).

3. The thermal protector of claim 1, wherein: When the other end of the moving spring assembly (3) contacts one end of the stationary foot assembly (8), the stationary foot two (6), the heating element (7), the stationary foot one (5), the moving spring assembly (3), the stationary foot assembly (8), and the pin (1) are connected in sequence to form an electrical circuit.

4. The thermal protector of claim 1, wherein: The limiting platform (9-2) is provided with two strip-shaped protrusions.

5. The thermal protector of claim 1, wherein: The heating element (7) is made of alloy resistance wires of different diameters, such as nickel-chromium, constantan, and iron-chromium, and is bent into m-shaped, u-shaped, s-shaped, and Ω-shaped structures.

6. The thermal protector of claim 1, wherein: The heating element (7), bimetallic strip (4), and moving spring assembly (3) are arranged sequentially from bottom to top.

7. An apparatus for manufacturing the heat-generating body according to any one of claims 1 to 6, characterized by: The manufacturing equipment includes a conveying mechanism (A) for conveying the heating wire, a bending mechanism (C) for bending the heating wire into a planar geometric structure, and a cutting mechanism (B) for cutting the bent heating wire to form a heating element (7). The cutting mechanism (B) is located above the bending mechanism (C), and both the cutting mechanism (B) and the bending mechanism (C) cooperate with the conveying mechanism (A).

8. The heat generator production apparatus according to claim 7, wherein: The conveying mechanism (A) includes a fixed base (A1), a servo motor (A2), a transmission gear set (A3), and a spool set (A4). The servo motor (A2), the transmission gear set (A3), and the spool set (A4) are all mounted on the fixed base (A1). The servo motor (A2) is connected to the transmission gear set (A3). The servo motor (A2) drives the transmission gear set (A3) to push the heating wire, and the spool set (A4) adjusts the heating wire to be flat.

9. The heat generator production apparatus according to claim 7, wherein: The cutting mechanism (B) includes a fixed frame (B1), a cylinder (B2) and scissors (B3). The cylinder barrel of the cylinder (B2) is fixed on the fixed frame (B1), and the piston rod of the cylinder (B2) is connected to the scissors (B3). The scissors (B3) are pushed by the cylinder (B2).

10. The heat generator production apparatus according to claim 7, wherein: The bending mechanism (C) includes a fixed plate (C1), a guide wheel assembly (C2), a line positioning seat (C3), a bending needle (C4), a rotating wheel (C5), a second servo motor (C6), and a bending seat (C7). The guide wheel assembly (C2), the line positioning seat (C3), and the bending seat (C7) are all mounted on the fixed plate (C1). The line positioning seat (C3) is located between the guide wheel assembly (C2) and the bending seat (C7). The bending needle (C4) is mounted on the bending seat (C7). The bending seat (C7) is coaxially connected to the rotating wheel (C5). The rotating wheel (C5) is connected to the second servo motor (C6) via a belt and a pulley.

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