Stirring tool

Abstract

The utility model discloses a stirring tool, which relates to the field of welding tools and comprises a processing spindle, a stirring head and a temperature monitoring module. The machining main shaft and the stirring head are designed in a split mode, stirring heads of different specifications can be conveniently replaced under the condition that the machining main shaft is not disassembled, cost is reduced, efficiency is improved, meanwhile, the temperature monitoring module is also designed in a split mode, and the machining efficiency is improved. The temperature transmission assembly and the temperature sensing assembly of the temperature monitoring module can be combined and connected while the stirring head is installed, so that the stirring tool can monitor the temperature of the stirring head in real time at high precision and high frequency, and data support and guidance are provided for production and scientific research.

Description

Technical Field

[0001] This utility model relates to the field of welding tools, and in particular to a stirring tool. Background Technology

[0002] Friction welding is a highly efficient solid-state welding technology that generates heat through the relative movement (usually rotation) of workpieces and the friction of the contact surfaces, causing the material surface to reach a plastic state, and then achieving a connection under pressure.

[0003] The existing stirring tools used in friction welding have the following problems: 1. Existing stirring tools are generally of one-piece structure. If the one-piece machining part is severely damaged by collision during use, the entire tool holder needs to be replaced, which is costly and reduces efficiency; 2. The existing method for testing the temperature of the machined surface is mainly to detect the temperature of the heat-affected zone near the machining position by using a sliding contact thermocouple. The surface roughness of the workpiece, the fitting space, and the sliding speed under actual working conditions limit the temperature measurement accuracy of the sliding contact thermocouple, resulting in inaccurate temperature measurement. Alternatively, the thermocouple wire is placed near the machining position through a pre-machined hole or groove. After machining, the thermocouple tip will form a metallurgical bond with the material near the machining position, making it unusable and costly. At the same time, existing stirring tools cannot achieve accurate high-frequency temperature measurement at the same time, which will greatly hinder the digitalization and intelligent monitoring in the field of machining; 3. During the welding process, excessively high interface processing temperature will directly affect the service life of the tool and will also significantly affect the microstructure of the welded area or deposited component (such as abnormal grain growth and uneven interlayer bonding), thereby reducing the mechanical properties, tensile properties, and corrosion evolution behavior of the welded area or deposited component. Utility Model Content

[0004] This utility model provides a stirring tool with a split design, which can meet the needs of quick change of working conditions. When the stirring head is installed, the temperature transmission component and the temperature sensing component can be connected together to facilitate the monitoring of the processing temperature.

[0005] This utility model provides a stirring tool, including a machining spindle, a stirring head, and a temperature monitoring module; the machining spindle and the stirring head are detachably connected along a first direction; the temperature monitoring module includes a temperature sensing component and a temperature transmission component, the temperature sensing component is disposed on the stirring head and is used to monitor the temperature of the stirring head; the temperature transmission component is disposed on the machining spindle, and the temperature transmission component and the temperature sensing component can be detachably connected along the first direction, the temperature transmission component is used to transmit the temperature signal of the stirring head to the outside.

[0006] The stirring tool of this utility model has at least the following beneficial effects:

[0007] The mixing tool of this utility model adopts a split design, which allows for easy replacement of mixing heads of different specifications without disassembling the machining spindle, thus reducing costs and increasing efficiency. At the same time, the temperature monitoring module also adopts a split design, which allows the temperature transmission component and temperature sensing component of the temperature monitoring module to be combined and connected when the mixing head is installed. This enables the mixing tool to monitor the temperature of the mixing head in real time with high precision and high frequency, providing data support and guidance for production and scientific research. Attached Figure Description

[0008] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0009] Figure 1 This is a side view of the stirring tool in this application;

[0010] Figure 2 yes Figure 1 A partial schematic diagram of the bottom of the machining spindle;

[0011] Figure 3 yes Figure 1 Schematic diagram of the structure of the stirring head;

[0012] Figure 4 yes Figure 1 AA diagram;

[0013] Figure 5 yes Figure 4 Enlarged view of point A in the middle;

[0014] Figure 6 This is a schematic diagram of the temperature monitoring module in this application;

[0015] Figure 7 This is a schematic diagram of the structure of the stirring head and temperature sensing assembly in this application;

[0016] Figure 8 yes Figure 7 Vertical cross-sectional view;

[0017] Figure 9 This is a bottom view of the stirring tool in this application;

[0018] Figure 10 Yes, yes Figure 9 Schematic diagram of BB in the middle;

[0019] Figure 11 yes Figure 10 Enlarged view of point B in the middle;

[0020] Figure 12 yes Figure 9 Schematic diagram of CC in the middle;

[0021] Figure 13 yes Figure 12 Enlarged view of point C in the middle;

[0022] The reference numerals in the attached drawings are explained as follows: 100, machined spindle; 101, polygonal hole; 102, first connecting hole; 103, threaded component; 104, bottom surface of the machined spindle; 105, second receiving hole; 106, boss; 107, first flow hole; 107a, inlet of the first flow hole; 107b, outlet of the first flow hole; 108, second flow hole; 108a, inlet of the second flow hole; 108b, outlet of the second flow hole; 109, seal;

[0023] 200. Stirring head; 201. Fitting block; 202. Second connecting hole; 203. Top surface of stirring head;

[0024] 204. First receiving hole; 205. Water tank;

[0025] 300. Temperature monitoring module; 301. Temperature sensing component; 302. Temperature transmission component; 303. Copper nail; 304. Thermocouple; 305. Probe unit; 306. Connecting wire; 307. Terminal body; 308. Spring probe. Detailed Implementation

[0026] The features and exemplary embodiments of various aspects of this utility model will now be described in detail. To make the objectives, technical solutions, and advantages of this utility model clearer, the following description, in conjunction with the accompanying drawings and specific embodiments, will provide a further detailed description. It should be understood that the specific embodiments described herein are intended only to explain this utility model and not to limit it. For those skilled in the art, this utility model can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this utility model by illustrating examples of it.

[0027] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0028] This embodiment discloses a stirring tool that can be used in fields such as friction welding. The stirring tool includes a machining spindle 100, a stirring head 200, and a temperature monitoring module 300, as detailed below:

[0029] like Figure 1 As shown, the machining spindle 100 and the stirring head 200 are detachably connected along a first direction. When the machining spindle 100 and the stirring head 200 are disconnected, they can separate along the first direction. When it is necessary to connect the machining spindle 100 and the stirring head 200 together, they approach each other and connect together along the first direction. The connection between the machining spindle 100 and the stirring head 200 can be achieved using threaded connections, magnetic connections, snap-fit ​​connections, etc. In this embodiment, the first direction is configured as the axial direction of the machining spindle 100, i.e., the height direction.

[0030] like Figure 2 and Figure 3 As shown, the bottom surface 104 of the machining spindle is recessed inward along the first direction to form a polygonal hole 101 (the inner circumferential outline of the polygonal hole 101 is polygonal). The polygonal hole 101 can be a triangular hole, a quadrilateral hole, a pentagonal hole, etc. (a quadrilateral hole is shown in this embodiment), as long as it can transmit torque between the machining spindle 100 and the stirring head 200. A fitting block 201 is provided on the top surface 203 of the stirring head. The outer circumferential shape of the fitting block 201 fits the polygonal hole 101. In this embodiment, the fitting block 201 is a quadrilateral square block, and the fitting block 201 and the polygonal hole 101 are clearance-fitted. When it is necessary to connect the machining spindle 100 and the stirring head 201 together, the fitting block 201 is aligned with the polygonal hole 101 and inserted into the polygonal hole 101 along the first direction.

[0031] like Figure 2 and Figure 3As shown, a plurality of first connecting holes 102 are provided on the outer peripheral side of the machining spindle 100. The plurality of first connecting holes 102 are spaced apart along the circumference of the machining spindle 100. The first connecting holes 102 are radially connected to the polygonal hole 101. The mating block 201 is provided with second connecting holes 202 corresponding one-to-one with the first connecting holes 102. Threaded parts 103 (such as nut screws, connecting bolts, etc.) pass through the first connecting holes 102 and are threaded to the second connecting holes 202, thereby realizing a detachable connection between the machining spindle 100 and the stirring head 200. When it is necessary to disconnect the connection between the machining spindle 100 and the stirring head 200, it is only necessary to unscrew the threaded parts 103 out of the second connecting holes 202.

[0032] like Figure 4 and Figure 5 As shown, the bottom surface 104 of the machining spindle and the top surface 203 of the stirring head are both configured as horizontal surfaces. When the machining spindle 100 and the stirring head 200 are connected together, the bottom surface 104 of the machining spindle 100 and the top surface 203 of the stirring head are in contact and abut against each other. In the first direction, the axis of the first connecting hole 102 is at a first predetermined distance H1 from the bottom surface 104 of the machining spindle, and the axis of at least one second connecting hole 202 is at a second predetermined distance H2 from the top surface 203 of the stirring head. The second predetermined distance H2 is less than the first predetermined distance H1, that is, the axis of the first connecting hole 102 and the axis of the second connecting hole 202 have a predetermined distance difference (the specific difference value is selected according to the actual situation). When the threaded part 103 is tightened, since the second predetermined distance H2 is less than the first predetermined distance H1, the threaded part 103 will drive the stirring head 200 to tighten upward during the tightening process. That is, the upper top surface of the stirring head 200 and the lower bottom surface of the machining spindle 100 are tightly attached, which can achieve both locking and a certain waterproof effect.

[0033] In some preferred embodiments, such as Figure 3 and Figure 5As shown, the multiple second connecting holes 202 provided on the mating block 201 are divided into two types. The axis of the first type of second connecting hole 202 is at a second predetermined distance H2 from the top surface 203 of the stirring head, which is less than the first predetermined distance H1. The axis of the second type of second connecting hole 202 is also at a second predetermined distance from the top surface 203 of the stirring head, but this second predetermined distance is equal to the first predetermined distance, that is, the axis of the second type of second connecting hole 202 and the first connecting hole 102 are located in the same horizontal plane. A corner is formed between two adjacent sides of the mating block 201, and the first type of second connecting hole 202 is provided at the corner. The first type of second connecting hole 202 is used to generate upward pressure to keep the stirring head 200 in close contact with the machining spindle 100, and the second type of second connecting hole 202 serves to position the stirring head 200. In addition, in some other embodiments, all the multiple second connecting holes 202 can be designed as the first type of second connecting holes 202, and all are eccentrically locked.

[0034] like Figure 6 As shown, the temperature monitoring module 300 includes a temperature sensing component 301 and a temperature transmission component 302. The temperature sensing component 301 is disposed on the stirring head 200 and is used to monitor the temperature of the stirring head 200. The temperature transmission component 302 is disposed on the machining spindle 100. The temperature transmission component 302 and the temperature sensing component 301 can be detachably connected along a first direction. The temperature transmission component 302 can be used to transmit the temperature signal of the stirring head 200 to the outside. When the machining spindle 100 and the stirring head 200 are connected together, the temperature sensing component 301 and the temperature transmission component 302 will be in direct contact. The temperature signal of the temperature sensing component 301 is transmitted to the temperature transmission component 302, and the temperature transmission component 302 transmits the temperature signal to the external system (i.e., the host computer). This embodiment realizes a closed loop of temperature monitoring by combining the host computer, thereby obtaining high-precision temperature information of the stirring head 200 in real time during the processing.

[0035] like Figure 7 and Figure 8As shown, along the first direction, the top surface of the mating block 201 is provided with a first receiving hole 204 (blind hole) extending away from the machining spindle 100. The opening at the upper end of the first receiving hole 204 is opened on the top surface of the mating block 201. The first receiving hole 204 extends downward to a certain depth away from the machining spindle 100. At least part of the temperature sensing component 301 is disposed in the first receiving hole 204. The temperature sensing component 301 extends in the first receiving hole 204 along the depth direction of the first receiving hole 204. By placing the temperature sensing component 301, which can sense the temperature, in the stirring head 200 through the first receiving hole 204 with a certain depth, the temperature of the stirring head 200 can be measured accurately in real time. At the same time, it avoids the defects caused by using a sliding contact thermocouple to detect the temperature of the heat-affected zone near the machining position or placing the thermocouple wire through a pre-processed hole or groove near the machining position in the prior art.

[0036] like Figure 9 and Figure 10 As shown, the lower end of the machining spindle 100 is provided with a concave polygonal hole 101, and the inner top surface of the polygonal hole 101 is provided with a second receiving hole 105 communicating with the outer peripheral surface of the machining spindle 100; at least a portion of the temperature transmission component 302 is disposed in the second receiving hole 105, wherein the lower end of the temperature transmission component 302 is correspondingly disposed with the upper end of the temperature sensing component 301 in the first direction. When the machining spindle 100 and the stirring head 200 are connected along the first direction, the lower end of the temperature transmission component 302 can contact the upper end of the temperature sensing component 301, thereby realizing the transmission of temperature signals.

[0037] like Figure 11 As shown, the temperature sensing component 301 includes a copper nail 303 and a thermocouple 304; the copper nail 303 is disposed at the opening of the first receiving hole 204, and the copper nail 303 is connected to the thermocouple 304, which is located below the copper nail 303; the thermocouple 304 is disposed inside the first receiving hole 204, and extends a certain length within the first receiving hole 204 along its length direction, so as to more accurately measure the temperature of the stirring head 200.

[0038] like Figure 11As shown, the temperature transmission assembly 302 includes a probe unit 305, a connecting wire 306, and a circuit board (not shown). At least a portion of the probe unit 305 is disposed at the opening of the second receiving hole 105 (an opening located on the inner top surface of the polygonal hole 101). When the machining spindle 100 and the stirring head 200 are connected along the first direction, the probe unit 305 can connect to or contact the copper nail 303 in the first direction. The connecting wire 306 is disposed within the second receiving hole 105, extending along the length of the second receiving hole 105. Both ends of the connecting wire 306 are connected to the probe unit 305 and the circuit board, respectively. The circuit board is used to transmit temperature signals to an external system. The circuit board can be disposed on the machining spindle 100 or in other locations. Its specific structure can be found in the temperature monitoring circuit board in the prior art, which will not be described in detail in this embodiment. The circuit board can transmit the temperature signal to an external system (host computer) wirelessly.

[0039] During the welding process, the stirring head 200 will be subjected to friction, axial pressure, and lateral force from material flow, resulting in heat accumulation and a high thermal field at the contact interface. This heat will be directly monitored in real time by the thermocouple 304 inside the stirring head 200 and will be transferred sequentially to: copper nail 303 → probe unit 305 → connecting wire 306 → circuit board. The above parts constitute the transmitting end of temperature monitoring, while the external system (host computer) can act as the receiving end to receive temperature signals in real time. At the same time, the user can adjust the frequency to be monitored within a predetermined range to achieve high-precision monitoring of temperature data.

[0040] like Figure 11 As shown, the probe unit 305 includes a terminal body 307 and a spring probe 308. The terminal body 307 is disposed at the opening of the second receiving hole 105 (an opening located on the inner top surface of the polygonal hole 101). The spring probe 308 is disposed on the terminal body 307 and can elastically extend and retract in the first direction (i.e., the height direction). At least a portion of the spring probe 308 protrudes downward from the inner top surface of the polygonal hole 101. When the machining spindle 100 and the stirring head 200 are connected along the first direction, the lower end of the spring probe 308 can elastically abut against the copper nail 303 in the first direction. The two ends of the connecting wire 306 are respectively connected to the spring probe 308 and the circuit board.

[0041] In this embodiment, a tight assembly of the various structures can be achieved through a special electrical signal transmission spring probe 308, copper nail 303, and high-temperature resistant insulating mating block 201. Furthermore, the use of a spring probe 308 with an internal spring allows for floating contact between the spring probe 308 and the copper nail 303, effectively buffering any hard contact and allowing sufficient slack in assembly. This reduces processing and assembly difficulty and significantly improves the stability of temperature signal transmission, ensuring accurate temperature monitoring at the processing location. The copper nail 303 can assist in transmitting signals from the thermocouple 304; the threads on the copper nail 303 better lock with the thermocouple 304, and the internal hexagonal groove of the copper nail 303 can cover the lower end of the spring probe 308, achieving good contact.

[0042] In some preferred embodiments, such as Figure 2 , Figure 3 and Figure 12 As shown, the bottom surface 104 of the machining spindle is provided with a downwardly protruding boss 106; the top surface 203 of the stirring head is recessed downward to form a water tank 205. When the machining spindle 100 and the stirring head 200 are connected along the first direction, the boss 106 can be inserted into the water tank 205 along the first direction, thereby realizing the positioning and stable transmission of torque between the machining spindle 100 and the stirring head 200. In this embodiment, the bottom surface 104 of the machining spindle is provided with multiple bosses 106 at intervals along its circumference, and the water tank 205 on the stirring head 200 is provided in a one-to-one correspondence with the bosses 106.

[0043] like Figure 13 As shown, the machining spindle 100 is provided with a first flow hole 107 and a second flow hole 108. The inlet 107a of the first flow hole is located on the outer peripheral surface of the machining spindle 100. The first flow hole 107 extends downward along the axial direction of the machining spindle 100, and the outlet 107b of the first flow hole is located on the lower end face of the boss 106. The inlet 108a of the second flow hole is located on the lower end face of the boss 106, and the second flow hole 108 extends upward along the axial direction of the machining spindle 100. The outlet 108b of the second flow hole is located on the outer peripheral surface of the machining spindle 100. A channel for the flow of cooling medium is formed between the first flow hole 107, the water tank 205, and the second flow hole 108. The external cooling medium enters from the inlet 107a of the first flow hole, and then enters the water tank 205 of the stirring head 200 from the outlet 107b of the first flow hole to cool the stirring head 200. Then the cooling medium in the water tank 205 flows out from the inlet 108a of the second flow hole to its outlet.

[0044] In this embodiment, the first flow hole 107, the water tank 205, and the second flow hole 108 can form a circulating self-cooling structure, which can improve the service life of the stirring tool, alleviate the thermal field evolution behavior in production or scientific research, and play a key role in the machining process of high-temperature alloy materials (high heat generation), making the machining process more stable. This embodiment has a total of four first flow holes 107 and four second flow holes 108. The cooling medium enters from the periphery of the machining spindle 100 into the four first flow holes 107 respectively, flows to the water tank 205, and then exits through the four corresponding second flow holes 108, achieving complete circulating self-cooling of the machining spindle 100 and the stirring head 200 to the maximum extent.

[0045] like Figure 2 and Figure 13 As shown, a sealing element 109 is sleeved on the outer periphery of the boss 106. The sealing element 109 can be a rubber sealing ring or other sealing ring with elastic deformation capability. When the machining spindle 100 and the stirring head 200 are connected along the first direction, at least part of the elastic sealing ring is squeezed between the inner peripheral wall of the water tank 205 and the outer peripheral wall of the boss 106, thereby achieving a seal between the inner side wall of the water tank 205 and the side wall of the boss 106, and preventing the leakage of cooling medium.

[0046] The working principle of the stirring tool in this embodiment is as follows:

[0047] Preparation: Align the mating block 201 on the stirring head 200 with the polygonal hole 101 on the bottom surface of the machining spindle 100, and align the boss 106 at the lower end of the machining spindle 100 with the water tank 205 of the stirring head 200. Insert the mating block 201 into the polygonal hole 101 along the first direction, and insert the boss 106 into the water tank 205. Then, use multiple threaded parts 103 to connect the first connecting hole 102 on the machining spindle 100 and the second connecting hole 202 on the mating block 201 one by one, thereby realizing the connection between the stirring head 200 and the machining spindle 100.

[0048] Welding process: The stirring head 200 rotates under the drive of the machining spindle 100 and moves relative to the workpiece below the stirring head 200, thereby achieving welding of the workpiece;

[0049] During the processing, the temperature of the stirring head 200 is monitored in real time by thermocouple 304. The temperature signal monitored by thermocouple 304 passes through copper nail 303 → spring probe 308 → connecting wire 306 → circuit board in sequence, and is finally uploaded to the external system (host computer) by the circuit board.

[0050] During the processing, the cooling medium flows from the inlet 107a of the first flow hole, through the water tank 205 and the inlet 108a of the second flow hole in sequence, and finally flows out from the outlet 108b of the second flow hole, thereby cooling the processing spindle 100 and the stirring head 200.

[0051] The above description is merely a specific embodiment of this utility model. Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, modules, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model.

Claims

1. A stirring tool, characterized in that, It includes a machining spindle (100), a stirring head (200), and a temperature monitoring module (300); The machining spindle (100) and the stirring head (200) are detachably connected along the first direction; The temperature monitoring module (300) includes a temperature sensing component (301) and a temperature transmission component (302). The temperature sensing component (301) is disposed on the stirring head (200) and is used to monitor the temperature of the stirring head (200). The temperature transmission component (302) is disposed on the machining spindle (100). The temperature transmission component (302) and the temperature sensing component (301) can be detachably connected along the first direction. The temperature transmission component (302) is used to transmit the temperature signal of the stirring head (200) to the outside.

2. The stirring tool according to claim 1, characterized in that, The bottom surface (104) of the machining spindle is provided with a polygonal hole (101), and the top surface (203) of the stirring head is provided with a fitting block (201) whose shape matches the polygonal hole (101). The fitting block (201) can be inserted into the polygonal hole (101) along the first direction; the first direction is configured as the axial direction of the machining spindle (100).

3. The stirring tool according to claim 2, characterized in that, The machining spindle (100) has a first connecting hole (102) on its outer periphery that connects to the polygonal hole (101); the mating block (201) has a second connecting hole (202); the threaded part (103) is connected to the first connecting hole (102) and the second connecting hole (202) to realize the detachable connection between the machining spindle (100) and the stirring head (200).

4. The stirring tool according to claim 3, characterized in that, The top surface (203) of the stirring head abuts against the bottom surface (104) of the machining spindle; in the first direction, the axis of the first connecting hole (102) has a first predetermined distance (H1) from the bottom surface (104) of the machining spindle, and the axis of at least one second connecting hole (202) has a second predetermined distance (H2) from the top surface (203) of the stirring head, the second predetermined distance (H2) being less than the first predetermined distance (H1).

5. The stirring tool according to any one of claims 2 to 4, characterized in that, In the first direction, the top surface of the mating block (201) is provided with a first receiving hole (204) extending away from the machining spindle (100), and the temperature sensing component (301) is disposed in the first receiving hole (204); The inner top surface of the polygonal hole (101) is provided with a second receiving hole (105) that connects to the outer peripheral surface of the machining spindle (100); at least a portion of the temperature transmission component (302) is disposed in the second receiving hole (105).

6. The stirring tool according to claim 5, characterized in that, The temperature sensing component (301) includes a copper nail (303) and a thermocouple (304); the copper nail (303) is disposed at the opening of the first receiving hole (204) and is connected to the thermocouple (304); the thermocouple (304) is disposed inside the first receiving hole (204) and extends along the length direction of the first receiving hole (204); The temperature transmission component (302) includes a probe unit (305), a connecting wire (306), and a circuit board; at least a portion of the probe unit (305) is disposed at the opening of the second receiving hole (105), and the probe unit (305) can be connected to the copper nail (303) in a first direction; the connecting wire (306) is disposed in the second receiving hole (105), and both ends of the connecting wire (306) are respectively connected to the probe unit (305) and the circuit board, and the circuit board is used to transmit temperature signals to an external system.

7. The stirring tool according to claim 6, characterized in that, The probe unit (305) includes a terminal body (307) and a spring probe (308); the terminal body (307) is disposed at the opening of the second receiving hole (105); the spring probe (308) is disposed on the terminal body, and at least a portion of the spring probe (308) protrudes from the inner top surface of the polygonal hole (101) for elastically abutting against the copper nail (303) in a first direction; the two ends of the connecting wire (306) are respectively connected to the spring probe (308) and the circuit board.

8. The stirring tool according to any one of claims 2 to 4, characterized in that, The bottom surface (104) of the machining spindle is provided with a boss (106); the top surface (203) of the stirring head is provided with a water tank (205), and the boss (106) can be inserted into the water tank (205) along the first direction.

9. The stirring tool according to claim 8, characterized in that, The machining spindle (100) is provided with a first flow hole (107) and a second flow hole (108); the inlet of the first flow hole (107) is located on the outer peripheral surface of the machining spindle (100), and the outlet of the first flow hole (107) is located on the boss (106); the inlet of the second flow hole (108) is located on the boss (106), and the outlet of the second flow hole (108) is located on the outer peripheral surface of the machining spindle (100). A channel for the flow of cooling medium is formed between the first flow hole (107), the water tank (205) and the second flow hole (108).

10. The stirring tool according to claim 9, characterized in that, A sealing element (109) is fitted on the outer periphery of the boss (106), and the sealing element (109) is located between the inner peripheral wall of the water tank (205) and the outer peripheral wall of the boss (106).

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