Diffusion brazing machine capable of measuring temperature at multiple points

Abstract

The utility model provides a multi-point temperature measurement diffusion brazing machine which can improve the reliability of collected temperature and facilitate accurate control of welding temperature. The multi-point temperature measurement diffusion brazing machine comprises an electric cabinet, a workbench, a fixed die, a movable die, a lifting driving mechanism, a first electric connecting part and a second electric connecting part, and a welding operation area is formed between the fixed die and the movable die; a temperature detection mechanism is arranged on each of the two sides of the fixed mold on the workbench; the temperature detection mechanism comprises a connecting plate installed on the workbench, a limiting plate located above the connecting plate, a lead screw rotationally penetrating through the limiting plate, rotationally connected with the connecting plate and extending in the vertical direction, and a guide rod arranged beside the lead screw and fixedly connected with the limiting plate and the connecting plate. The sliding piece is slidably connected to the guide rod in a sleeving mode and is in threaded fit with the lead screw, the temperature sensor is fixed to the sliding piece and electrically connected with the electric cabinet, the detection end of the temperature sensor faces the welding operation area, and the temperature sensor ascends and descends along with the sliding piece when the lead screw bears external torsional force.

Description

Technical Field

[0001] This utility model relates to the field of diffusion brazing equipment technology, and in particular to a diffusion brazing machine with multi-point temperature measurement. Background Technology

[0002] Diffusion brazing is a process that involves adding an intermediate layer (filler metal) with a melting point lower than the substrate between workpieces to be joined. Heating and pressurizing cause a diffusion reaction at the interface, thus achieving a connection. Depending on the heating method, diffusion brazing is classified into induction diffusion brazing, furnace diffusion brazing, and resistance diffusion brazing. Resistance diffusion brazing uses current passing through the joint resistance to generate heat, keeping the workpiece molecules in an active state at a high temperature, melting the solder medium (such as copper solder paste or tin solder paste), and welding the workpieces together. The pull-out force of the welded workpieces is significantly greater than that of workpieces welded using traditional diffusion brazing processes. Furthermore, because resistance diffusion brazing achieves welding through localized heating of the workpieces, its energy consumption is significantly reduced compared to overall workpiece heating, which helps reduce product processing costs. Therefore, it is widely used in the processing of small, precision parts. During the operation of resistance diffusion brazing equipment, the welding temperature needs to be sensed in real time, and the welding parameters need to be adjusted via a controller to compensate for the welding temperature. Currently, most resistance diffusion brazing equipment in the industry uses single-point independent temperature measurement. The selection of the temperature sensor installation position directly affects the reliability of welding temperature control. Moreover, during the mold heating process, due to the difference in resistance values, the temperature of different parts on the same mold is not the same. Single-point temperature measurement often fails to accurately reflect the actual situation of workpiece welding, resulting in insufficient reliability of temperature detection and thus affecting the accurate control of workpiece welding temperature. Utility Model Content

[0003] Therefore, it is necessary to address the above-mentioned shortcomings by providing a diffusion brazing machine with multi-point temperature measurement. This machine improves the reliability of temperature acquisition by detecting welding temperature at multiple points and in multiple segments, which is conducive to precise control of welding temperature.

[0004] A diffusion brazing machine with multi-point temperature measurement includes an electrical control box, a worktable, a fixed mold fixed on the worktable and loaded with a first workpiece, a movable mold located above the fixed mold and loaded with a second workpiece, and a lifting drive mechanism for driving the movable mold to move closer to or away from the fixed mold. The fixed mold is provided with a first electrical connection part that contacts the first workpiece and is electrically connected to the electrical control box, and the movable mold is provided with a second electrical connection part that contacts the second workpiece and is electrically connected to the electrical control box. A welding operation area is formed between the fixed mold and the movable mold.

[0005] On the workbench, a temperature detection mechanism is provided on each of the two opposite sides of the fixed mold. The temperature detection mechanism includes a connecting plate installed on the workbench, a limiting plate located above the connecting plate, a lead screw that rotatably passes through the limiting plate and is rotatably connected to the connecting plate and extends in the vertical direction, a guide rod located beside the lead screw and fixedly connected to the limiting plate and the connecting plate, a sliding component that is slidably sleeved on the guide rod and threadedly engaged with the lead screw, and a temperature sensor fixed on the sliding component and electrically connected to the electrical control box. The detection end of the temperature sensor faces the welding operation area. When the lead screw is subjected to external torsional force, the temperature sensor moves up and down along the length of the guide rod along with the sliding component.

[0006] In one embodiment, a first arc-shaped through hole and a first central hole located at the center of the circle containing the first arc-shaped through hole are provided on the side of the connecting plate adjacent to the worktable. A first positioning pin passing through the first arc-shaped through hole and a second positioning pin passing through the first central hole are fixed on the worktable. The annular side of the first positioning pin abuts against the inner side of the first arc-shaped through hole, and the annular side of the second positioning pin abuts against the inner side of the first central hole.

[0007] In one embodiment, the central angle of the first arc-shaped through hole is 30°-180°.

[0008] In one embodiment, the temperature detection mechanism further includes a turntable located above the limiting plate and fixedly connected to the lead screw, and a handle fixed on the turntable.

[0009] In one embodiment, the temperature detection mechanism further includes a motor located above and fixedly connected to the limiting plate, wherein the output shaft of the motor is coaxial with and driven by the lead screw.

[0010] In one embodiment, the temperature detection mechanism includes a guide rod located on one side of the lead screw; or the temperature detection mechanism includes two guide rods symmetrically arranged on both sides of the lead screw.

[0011] In one embodiment, the slider includes a nut sleeved on and threadedly connected to a lead screw, a slider slidably sleeved on a guide rod, and a mounting plate fixedly connected to the nut and the slider.

[0012] In one embodiment, the nut and slider are respectively connected to the mounting plate screws, or the nut, slider and mounting plate are integrally formed.

[0013] In one embodiment, the temperature detection mechanism further includes an L-shaped fixing plate, which includes a horizontal plate and a vertical plate perpendicular to the horizontal plate and fixedly connected to one end of the horizontal plate. The vertical plate has a mounting hole, through which the temperature sensor passes and is fixedly connected to the vertical plate. The horizontal plate has a second arc-shaped through hole and a second central hole located at the center of the circle containing the second arc-shaped through hole. A third positioning pin passing through the second arc-shaped through hole and a fourth positioning pin passing through the second central hole are fixed on the side of the mounting plate adjacent to the horizontal plate. The annular side of the third positioning pin abuts against the inner side of the second arc-shaped through hole, and the annular side of the fourth positioning pin abuts against the inner side of the second central hole.

[0014] In one embodiment, two temperature detection mechanisms are installed off-center on the workbench, with one temperature detection mechanism located on the front side of the fixed mold and the other temperature detection mechanism located on the rear side of the fixed mold.

[0015] The diffusion brazing machine implementing this invention, which uses multi-point temperature measurement, has a temperature detection mechanism on each side of the welding operation area. Through the cooperation of a lead screw, guide rod, and sliding component, the height of the temperature sensor can be adjusted. This increases the number of temperature detection points in the diffusion brazing machine and allows for the detection of temperatures at multiple height levels within the welding operation area by adjusting the sensor height. This expands the temperature detection range and increases the number of temperature values ​​collected. The multiple temperature values ​​collected accurately reflect the heating of the workpiece by the diffusion brazing machine, improving the reliability and credibility of the collected temperature values. This facilitates precise control of the workpiece's welding temperature based on the collected temperature values. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a diffusion brazing machine with multi-point temperature measurement in one embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram of the structure of a diffusion brazing machine with multi-point temperature measurement in another embodiment of the present invention;

[0018] Figure 3 for Figure 1 A partially enlarged structural diagram of part A in the illustrated embodiment. Detailed Implementation

[0019] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0020] Please see Figure 1This utility model discloses a diffusion brazing machine with multi-point temperature measurement. The diffusion brazing machine includes an electrical control box 100, a worktable 200, a fixed mold 300 fixed on the worktable 200 and loading a first workpiece, a movable mold 400 located above the fixed mold 300 and loading a second workpiece, and a lifting drive mechanism 500 for driving the movable mold 400 closer to or further away from the fixed mold 300. The fixed mold 300 has a first electrical connection part that contacts the first workpiece and is electrically connected to the electrical control box 100. The movable mold 400 has a second electrical connection part that contacts the second workpiece and is electrically connected to the electrical control box 100. A welding operation area 600 is formed between the fixed mold 300 and the movable mold 400. Before diffusion brazing, the first workpiece to be welded is clamped on the fixed mold 300, and brazing filler metal is applied to the welding area of ​​the first workpiece. The second workpiece to be welded is clamped on the movable mold 400. The first and second workpieces can be fixed to each other by clips or magnetic adsorption, and both the first and second workpieces are made of conductive materials. Preferably, in this embodiment, both the first and second workpieces are made of copper. Of course, depending on the actual welding requirements, the first and second workpieces can also be made of aluminum, zinc, or other solid conductive metal materials. The materials of the first and second workpieces can be the same or different. In this embodiment, the lifting drive mechanism 500 can be one of a cylinder, an electric cylinder, a hydraulic cylinder, a motor, and a lead screw and nut connector. The electrical control box 100 contains a controller electrically connected to the lifting drive mechanism 500, the first electrical connection part, and the second electrical connection part, as well as a power supply providing power to the controller. This controller can be a PLC controller or a microcontroller. The outer surface of the electrical control box 100 is equipped with a touch screen display 110, a voltmeter 120, and an ammeter 130 electrically connected to the controller, so that operators can understand the working status of the diffusion brazing machine based on the displays on the touch screen 110, voltmeter 120, and ammeter 130, or send instructions to the controller through the touch screen 110 to adjust the working parameters of the diffusion brazing machine. An insulating pad 210 is also placed between the fixed mold 300 and the worktable 200 to prevent current from being conducted from the first electrical connection part on the fixed mold 300 to the worktable 200, thereby preventing leakage and electric shock accidents and improving the safety of diffusion brazing machine operation. The bottom of the worktable and the electrical control box are also equipped with casters or rollers to facilitate the movement of the diffusion brazing machine.

[0021] In the diffusion brazing operation, the lifting drive mechanism 500 drives the movable mold 400 to descend, causing the movable mold 400 to move the second workpiece closer to the first workpiece until the second workpiece contacts the brazing filler metal on the first workpiece. Subsequently, the electrical control box 100 controls the first and second electrical connection parts to conduct electricity, further conducting current to the first and second workpieces, and connecting through the brazing filler metal. In this case, the mating part (joint) of the first and second workpieces will generate resistance heat, which will heat the brazing filler metal, causing it to melt and fill the gap between the first and second workpieces. When the molten brazing filler metal solidifies, the connection between the first and second workpieces is achieved.

[0022] In this embodiment, a temperature detection mechanism 700 is provided on each of the two opposite sides of the fixed mold 300 on the workbench 200. The temperature detection mechanism 700 includes a connecting plate 710 installed on the workbench 200, a limiting plate 720 located above the connecting plate 710, a lead screw 730 that rotatably passes through the limiting plate 720 and is rotatably connected to the connecting plate 710 and extends in the vertical direction, a guide rod 740 disposed beside the lead screw 730 and fixedly connected to the limiting plate 720 and the connecting plate 710, a sliding member 750 that is slidably sleeved on the guide rod 740 and threadedly engaged with the lead screw 730, and a temperature sensor 760 fixed on the sliding member 750 and electrically connected to the electrical control box 100. The detection end of the temperature sensor 760... The temperature sensor 760, facing the welding operation area 600, collects the temperature of the fixed mold 300 and the movable mold 400 within the welding operation area 600. When the lead screw 730 is subjected to external torsional force, the sliding member 750 moves up and down along the length of the guide rod 740. Thus, during the operation of the diffusion brazing machine, the two temperature sensors 760 detect the temperature on both sides of the first and second workpieces. Simultaneously, by adjusting the height of the temperature sensors 760, the temperature at multiple different height positions within the welding operation area 600 can be detected. A temperature curve can be plotted using the collected temperature values, allowing for feedback adjustment of the diffusion brazing machine's operating parameters, thereby improving the welding quality of the workpiece. Furthermore, by collecting temperatures at different heights within the welding operation area 600, the temperature conditions of multiple locations on the fixed mold 300 and the movable mold 400 can be obtained, allowing for understanding the temperature rise of the fixed mold 300 and the movable mold 400 during welding. This enables timely adjustment of welding operation parameters to prevent mold damage caused by excessively high temperatures in the fixed mold 300 and the movable mold 400, thus protecting the molds.

[0023] Please combine Figure 1 and Figure 3In one embodiment, the connecting plate 710 has a first arc-shaped through hole 711 and a first central hole 712 located at the center of the circle containing the first arc-shaped through hole 711 on one side adjacent to the worktable 200. A first positioning pin 220 passing through the first arc-shaped through hole 711 and a second positioning pin 230 passing through the first central hole 712 are fixed on the worktable 200. The annular side of the first positioning pin 220 abuts against the inner side of the first arc-shaped through hole 711, and the annular side of the second positioning pin 230 abuts against the inner side of the first central hole 712. Alternatively, the first positioning pin 220 is tightly fitted to the inner side of the first arc-shaped through hole 711, and the second positioning pin 230 is tightly fitted to the inner side of the first central hole 712. This prevents the connecting plate 710 from wobbling relative to the worktable 200 due to insecure installation. Furthermore, the central angle of the first arc-shaped through hole 711 is 30°-180°. In this embodiment, by opening a first arc-shaped through hole 711 and a first central hole 712 on the connecting plate 710, and fixing a first positioning pin 220 and a second positioning pin 230 on the workbench 200, when the connecting plate 710 is subjected to external thrust, it will rotate within the central angle range of the first arc-shaped through hole 711 with the second positioning pin 230 as the center and the distance between the first positioning pin 220 and the second positioning pin 230 as the radius, so as to adjust the rotation angle of the temperature sensor 760 in the horizontal plane (or the upper surface of the workbench 200), thereby expanding the detection range of the temperature sensor 760 for different parts of the welding operation area 600, and increasing the number of temperature detection points on the fixed mold 300 and the movable mold 400, so as to realize multi-angle temperature detection of the fixed mold 300 and the movable mold 400 in the horizontal plane, so as to achieve accurate temperature measurement.

[0024] Preferably, a first limiting head is fixed to the top of the first positioning pin 220, and a second limiting head is fixed to the top of the second positioning pin 230. The width of the first limiting head is greater than the width of the first arc-shaped through hole 711, and the width of the second limiting head is greater than the width of the first central hole 712. The lower surface of the first limiting head abuts against the edge of the first arc-shaped through hole 711, and the lower surface of the second limiting head abuts against the edge of the first central hole 712. This prevents the connecting plate 710 from detaching from the first positioning pin 220 and the second positioning pin 230 from above the worktable 200, improving the stability of the temperature detection mechanism 700 on the worktable 200. Of course, when the lower surface of the connecting plate 710 is fully in contact with the mounting plane of the first positioning pin 220 and the second positioning pin 230, the mounting plane can provide stable support for the temperature detection mechanism 700, and the first and second limiting heads can be omitted.

[0025] To facilitate the rotation of the lead screw 730 for adjusting the height of the temperature sensor 760, please refer to [link / reference needed]. Figure 1In one embodiment, the temperature detection mechanism 700 further includes a turntable 770 located above the limiting plate 720 and fixedly connected to the lead screw 730, and a handle 771 fixed on the turntable 770. Preferably, the handle 771 is fixed to the upper surface edge of the turntable 770. Thus, the operator can grasp the handle 771 and rotate the turntable 770 to drive the lead screw 730 to rotate, causing the slider 750 and the temperature sensor 760 to rise and fall vertically, achieving manual adjustment of the detection height of the temperature sensor 760. This allows the slider 750 and the temperature sensor 760 to move along a predetermined trajectory, enabling multi-point monitoring for accurate temperature measurement. Please refer to [link to relevant documentation]. Figure 2 In another embodiment, the temperature detection mechanism 700 also includes a motor 780 located above and fixedly connected to the limiting plate 720. The output shaft of the motor 780 is coaxial with and driven by the lead screw 730. The motor 780 is electrically connected to the controller of the electrical control box 100. Thus, the motor 780 is controlled by the controller to work, and the output shaft of the motor 780 drives the lead screw 730 to rotate, so that the sliding member 750 and the temperature sensor 760 can move along a predetermined trajectory to achieve multi-point monitoring for accurate temperature measurement.

[0026] In one embodiment, the temperature detection mechanism 700 includes a guide rod 740 located on one side of the lead screw 730. That is, each temperature detection mechanism 700 includes only one guide rod 740 located beside the lead screw 730. The guide rod 740 limits the sliding member 750 to prevent rotation and restrict its sliding path. In another embodiment, the temperature detection mechanism 700 includes two guide rods 740 symmetrically arranged on both sides of the lead screw 730. By providing one guide rod 740 on each side of the lead screw 730, the swaying of the sliding member 750 during lifting and lowering can be reduced, improving the smoothness of the lifting and lowering of the sliding member 750.

[0027] To ensure smooth rotation of the lead screw 730, in one embodiment, a through hole is provided on the limiting plate 720, in which a first bearing 721 is fixed. A second bearing 713 is fixed on the connecting plate 710. The top of the lead screw 730 passes through the first bearing 721 and rotatably engages with it, while the bottom of the lead screw 730 is inserted into and rotatably engages with the second bearing 713. Preferably, the first bearing 721 and the second bearing 713 are tapered roller bearings. By providing the first bearing 721 and the second bearing 713, the resistance during the rotation of the lead screw 730 can be reduced, ensuring smooth rotation of the lead screw 730.

[0028] In this embodiment, the sliding member 750 includes a nut 751 sleeved on and threadedly connected to the lead screw 730, a slider 752 slidably sleeved on the guide rod 740, and a mounting plate 753 fixedly connected to the nut 751 and the slider 752. Further, the nut 751 and the slider 752 are respectively screwed to the mounting plate 753, or the nut 751, the slider 752, and the mounting plate 753 are integrally formed. Preferably, the nut 751 and the slider 752 are respectively screwed to the mounting plate 753.

[0029] Please combine Figure 1 and Figure 3 The temperature detection mechanism 700 also includes an L-shaped fixing plate 790. The L-shaped fixing plate 790 includes a horizontal plate 791 and a vertical plate 792 that is perpendicular to the horizontal plate 791 and fixedly connected to one end of the horizontal plate 791. The vertical plate 792 has a mounting hole 793. The temperature sensor 760 passes through the mounting hole 793 and is fixedly connected to the vertical plate 792. The horizontal plate 791 has a second arc-shaped through hole 794 and a second center hole 795 located at the center of the circle where the second arc-shaped through hole 794 is located. The mounting plate 753 has a third positioning pin 754 that passes through the second arc-shaped through hole 794 and a fourth positioning pin 755 that passes through the second center hole 795 fixed on one side adjacent to the horizontal plate 791. The annular side of the third positioning pin 754 abuts against the inner side of the second arc-shaped through hole, and the annular side of the fourth positioning pin 755 abuts against the inner side of the second center hole 795. This can also be understood as the third positioning pin 754 being tightly fitted to the inner surface of the second arc-shaped through hole 794, and the fourth positioning pin 755 being tightly fitted to the inner surface of the second center hole 795. This prevents the L-shaped fixing plate 790 from swaying relative to the mounting plate 753 under the influence of the gravity of the temperature sensor 760. Preferably, the central angle of the second arc-shaped through hole 794 is 30°-180°. Furthermore, a third limiting head is fixed to the end of the third positioning pin 754, and a fourth limiting head is fixed to the end of the fourth positioning pin 755. The width of the third limiting head is greater than the width of the second arc-shaped through hole 794, and the width of the fourth limiting head is greater than the width of the second central hole 795. The lower surface of the third limiting head abuts against the edge of the second arc-shaped through hole 794, and the lower surface of the fourth limiting head abuts against the edge of the second central hole 795. In this way, the temperature sensor 760 together with the L-shaped fixing plate 790 can be prevented from falling off the front and rear sides of the mounting plate 753, so as to ensure the stability of the installation of the temperature sensor 760.

[0030] In this embodiment, by opening a second arc-shaped through hole 794 and a second central hole 795 on the L-shaped fixing plate 790, and fixing a third positioning pin 754 and a fourth positioning pin 755 on the mounting plate 753, when the L-shaped fixing plate 790 is subjected to external thrust, it will rotate within the central angle range of the second arc-shaped through hole 794 with the fourth positioning pin 755 as the center and the distance between the third positioning pin 754 and the fourth positioning pin 755 as the radius, so as to adjust the rotation angle of the temperature sensor 760 in the vertical plane, thereby expanding the detection range of the temperature sensor 760 for different parts of the welding operation area 600, and increasing the number of temperature detection points on the fixed mold 300 and the movable mold 400, so as to realize multi-angle temperature detection of the fixed mold 300 and the movable mold 400 in the horizontal plane, so as to achieve accurate temperature measurement.

[0031] In another embodiment, two temperature detection mechanisms 700 are staggered on the worktable 200, with one temperature detection mechanism 700 located on the front side of the fixed mold 300 and the other temperature detection mechanism 700 located on the rear side of the fixed mold 300. In this embodiment, the two temperature detection mechanisms 700 are arranged on the left and right sides of the fixed mold 300, and their positions are staggered in the front-back direction of the fixed mold 300, which helps to increase the temperature detection range in the front-back direction of the fixed mold 300. Thus, by staggering the two temperature detection mechanisms 700 on both sides of the fixed mold 300, and by adjusting the detection height of the temperature sensor 760 in the vertical direction, the detection angle in the horizontal plane, and the detection angle in the vertical plane, comprehensive detection of the temperature of each part in the welding operation area 600 can be achieved. This allows for the plotting of welding temperature curves based on the detected temperature values ​​of each part in the welding operation area 600, thereby accurately controlling the welding temperature of the diffusion brazing machine on the workpiece and improving the welding effect.

[0032] The diffusion brazing machine implementing this utility model with multi-point temperature measurement has a temperature detection mechanism 700 on each side of the welding operation area 600. Through the cooperation of the lead screw 730, guide rod 740 and sliding member 750, the height of the temperature sensor 760 can be adjusted. In this way, while increasing the number of temperature detection points of the diffusion brazing machine, the temperature of multiple height segments within the welding operation area 600 can be detected by adjusting the height of the temperature sensor 760. This increases the temperature detection range and the number of temperature values. The multiple temperature values ​​collected can accurately reflect the heating of the workpiece by the diffusion brazing machine. The reliability and credibility of the collected temperature values ​​are improved, which is conducive to accurately controlling the welding temperature of the workpiece based on the collected temperature values.

[0033] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0034] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A multi-point temperature measurement diffusion brazing machine, comprising an electric control box, a workbench, a fixed mold fixed on the workbench and loaded with a first workpiece, a movable mold located above the fixed mold and loaded with a second workpiece, a lifting driving mechanism for driving the movable mold to approach or move away from the fixed mold, a first electric connection part provided on the fixed mold and in contact with the first workpiece and electrically connected to the electric control box, a second electric connection part provided on the movable mold and in contact with the second workpiece and electrically connected to the electric control box, and a welding operation area formed between the fixed mold and the movable mold; characterized in that, a temperature detection mechanism is arranged on each of two opposite sides of the fixed mold on the workbench, the temperature detection mechanism comprises a connecting plate mounted on the workbench, a limiting plate located above the connecting plate, a lead screw rotating through the limiting plate and rotationally connected with the connecting plate and extending in a vertical direction, a guide rod arranged beside the lead screw and fixedly connected with the limiting plate and the connecting plate, a sliding piece slidingly sleeved on the guide rod and threadedly matched with the lead screw, and a temperature sensor fixed on the sliding piece and electrically connected with the electric control box, a detection end of the temperature sensor faces the welding operation area, and the temperature sensor follows the sliding piece to rise and fall along the length direction of the guide rod when the lead screw is subjected to external torsional force.

2. The multi-point temperature measuring diffusion brazing machine according to claim 1, characterized in that, A first circular arc-shaped through hole and a first center hole located at the center of the circle of the first circular arc-shaped through hole are formed on one side of the connecting plate adjacent to the workbench, a first positioning pin penetrating through the first circular arc-shaped through hole and a second positioning pin penetrating through the first center hole are fixed on the workbench, the ring side surface of the first positioning pin abuts against the inner side surface of the first circular arc-shaped through hole, and the ring side surface of the second positioning pin abuts against the inner side surface of the first center hole.

3. The multi-point temperature measuring diffusion brazing machine according to claim 2, characterized in that, The central angle of the first circular arc-shaped through hole is 30°-180°.

4. The multi-point temperature measuring diffusion brazing machine according to claim 1, characterized in that, The temperature detection mechanism further comprises a rotating disc located above the limiting plate and fixedly connected with the lead screw, and a handle fixed on the rotating disc.

5. The multi-point temperature measuring diffusion brazing machine according to claim 1, characterized in that, The temperature detection mechanism further comprises a motor located above the limiting plate and fixedly connected with the limiting plate, and an output shaft of the motor is coaxial with the lead screw and is drivingly connected.

6. The multi-point temperature measuring diffusion brazing machine according to claim 1, characterized in that, The temperature detection mechanism comprises one guide rod located on one side of the lead screw; or the temperature detection mechanism comprises two guide rods symmetrically arranged on both sides of the lead screw.

7. The multi-point temperature measuring diffusion brazing machine according to claim 1, characterized in that, The sliding piece comprises a nut sleeved on the lead screw and threadedly connected with the lead screw, a sliding block slidingly sleeved on the guide rod, and a mounting plate fixedly connected with the nut and the sliding block.

8. The multi-point temperature measuring diffusion brazing machine according to claim 7, characterized in that, The nut and the sliding block are respectively screw-connected with the mounting plate, or the nut, the sliding block and the mounting plate are integrally formed.

9. The multi-point temperature measuring diffusion brazing machine according to claim 7, characterized in that, The temperature detection mechanism further comprises an L-shaped fixing plate, which comprises a horizontal plate and a vertical plate perpendicular to the horizontal plate and fixedly connected with one end of the horizontal plate, an installation hole is formed in the vertical plate, the temperature sensor passes through the installation hole and is fixedly connected with the vertical plate, the horizontal plate is provided with a second arc-shaped through hole and a second center hole located at the center of the circle of the second arc-shaped through hole, a third positioning pin passing through the second arc-shaped through hole and a fourth positioning pin passing through the second center hole are fixed on one side of the installation plate adjacent to the horizontal plate, the ring side surface of the third positioning pin abuts against the inner side surface of the second arc-shaped through hole, and the ring side surface of the fourth positioning pin abuts against the inner side surface of the second center hole.

10. The multi-point temperature measuring diffusion brazing machine according to claim 1, wherein The two temperature detection mechanisms are installed in a staggered manner on the workbench, one of the temperature detection mechanisms is located at the front side of the fixed mold, and the other temperature detection mechanism is located at the rear side of the fixed mold.

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