Low-voltage wire harness conduction brazing connection device and method

Abstract

The invention discloses a low-voltage wire harness conduction brazing connection device and method, and relates to the technical field of wire harness processing. The wire harness connector comprises a wire harness terminal and a fixing frame which are matched with each other, a conductor part of the wire harness terminal is provided with a first-stage groove, a second-stage groove and a third-stage groove which are axially through and gradually decreased in radial size, the inner wall of the first-stage groove is provided with a threaded wall, a drill rod injection hole is formed in the annular side of the first-stage groove, a conductor is inserted into the first-stage groove and the second-stage groove, and a partition ring is arranged at an opening in the outer side of the first-stage groove. The fixing frame is provided with a station groove and a conductor inserting groove, a pressure probe is embedded in the station groove, pneumatic clamping parts are arranged on the two sides of the station groove, a melt tank with a heating wire and a pressurizing air pipe is movably installed on one side of the fixing frame, and a photoelectric probe aligned with the third-level groove is arranged on the periphery of the fixing frame. According to the invention, the bonding force of the molten brazing filler metal can be enhanced, sufficient filling and no gap are ensured, the contact resistance is reduced, the conduction stability and connection reliability of the low-voltage wire harness are improved, and looseness and brazing filler metal overflow are avoided.

Description

Technical Field

[0001] This invention relates to the field of wire harness processing technology, and in particular to a low-voltage wire harness conductive brazing connection device and method. Background Technology

[0002] Low-voltage wiring harnesses are core connection components in electronic equipment, automotive electrical systems, and other fields. Their conductivity stability and connection reliability directly affect the overall operating efficiency and service life of the equipment. Brazing, due to its advantages such as high connection strength and good conductivity, has become one of the mainstream methods for connecting conductors and terminals in low-voltage wiring harnesses. However, existing low-voltage wiring harness brazing connection technology still has many problems that urgently need to be solved, which seriously restricts the improvement of connection quality.

[0003] First, the groove walls of traditional wire harness terminals are mostly smooth surfaces. After the solder solidifies, the bonding force between the solder and the groove wall is insufficient. During long-term use, the solder is prone to loosening due to factors such as vibration and thermal expansion and contraction, which increases the contact resistance and causes faults such as poor conductivity and localized overheating.

[0004] Secondly, in the solder filling process, existing devices mostly rely on natural flow or simple pressure to inject solder, which makes it difficult to ensure that the solder fully fills the gap between the conductor and the tank, easily forming defects such as voids and bubbles, further aggravating the problem of unstable contact resistance.

[0005] In addition, the lack of real-time and effective filling status detection means that it is impossible to accurately determine whether the solder is filled in place, often resulting in insufficient filling or excessive overflow, which not only affects the connection performance but also causes solder waste and environmental pollution.

[0006] In summary, these technical issues collectively lead to drawbacks in existing low-voltage wire harness brazing connections, such as high contact resistance, poor conductivity, and short connection life, which fail to meet the high precision and high reliability requirements of modern equipment for low-voltage wire harnesses. Summary of the Invention

[0007] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: This invention provides a low-voltage wire harness conductive brazing connection device, including a wire harness terminal adapted to the brazing connection device. The conductor portion of the wire harness terminal has a primary groove, a secondary groove, and a tertiary groove with axial penetration and decreasing radial dimensions. The primary groove has a threaded wall. A brazing hole communicating with the primary groove is opened on the circumferential side of the conductor portion. The conductor end after wire stripping is inserted into the primary groove and the secondary groove. A blocking ring is disposed at the opening position on the outer side of the primary groove of the conductor portion. The blocking ring is sleeved around the conductor and abuts against the insulation layer of the conductor.

[0008] The brazing connection device is equipped with a mounting frame, which has a through-type work station slot and a conductor slot. The wire harness terminal is clamped in the work station slot, and one end of the conductor protrudes from the conductor slot. A photoelectric probe aligned axially with the three-stage slot of the conductor is also mounted around the periphery of the mounting frame. A pressure probe for detecting the clamping position of the wire harness terminal is embedded in the side wall of the work station slot. A set of pneumatic clamping parts is located on both side walls of the work station slot. A molten material tank is movably mounted on one side wall of the work station slot. The mounting frame is equipped with a displacement actuator for directional movement of the molten material tank. An inlet pipe is connected to the upper side of the molten material tank, and an outlet pipe is connected to the lower side. The outlet pipe has an outlet cone end that mates with the brazing hole. The inlet pipe is equipped with an inlet valve and a pressurizing gas pipe located downstream of the inlet valve that injects pressurized gas into the molten material tank. The molten material tank is also equipped with a heating wire inserted downward into the outlet pipe.

[0009] As a preferred technical solution of the brazing connection device of the present invention: the radial dimensions of the first-level groove and the second-level groove are larger than the radial dimensions of the conductor after stripping the wire at the side end of the conductor, and the radial dimension of the third-level groove is smaller than the radial dimensions of the conductor after stripping the wire at the side end of the conductor.

[0010] As a preferred technical solution of the brazing connection device of the present invention: the partition ring is provided with a protrusion that can be inserted into the primary slot, and the wire harness terminal is provided with a wire clamping screw for fixing the insertion position of the secondary slot.

[0011] As a preferred embodiment of the brazing connection device of the present invention: a positioning groove for positioning wire harness terminals is provided on the inner side of the work station groove. Piston grooves are formed on both side walls of the work station groove, and a piston disc is disposed within the piston groove. The piston disc includes a piston ring that abuts against the inner wall of the piston groove. The piston disc is connected to a connecting rod, which is connected to a clamping part. The fixing frame is also equipped with an external air nozzle communicating with the piston groove, and the external air nozzle is connected to an air supply device via an air pipe.

[0012] As a preferred technical solution of the brazing connection device of the present invention: the feed pipe is connected to the upstream feeding equipment through the feed hose, and the pressurized air pipe is connected to the upstream booster pump through the air hose.

[0013] As a preferred technical solution of the brazing connection device of the present invention: the fixed frame is provided with a displacement groove for guiding the movable installation of the molten material tank, and a displacement connecting rod is provided at the output end of the displacement driver, with the side end of the displacement connecting rod fixedly connected to the molten material tank.

[0014] As a preferred technical solution of the brazing connection device of the present invention: the heating wire extends from the inner cavity of the melting tank to the discharge cone position of the discharge pipe.

[0015] This invention provides a method for conductive brazing connection of low-voltage wire harnesses, comprising the following: Step 1: Strip the insulation layer from the end of the conductor and place the isolation ring around the exposed conductor.

[0016] Step 2: Align the conductor with the primary and secondary slots of the wire harness terminal and insert it to complete the pre-fixation. Then, snap the wire harness terminal into the station slot of the fixing frame.

[0017] Step 3: The pressure probe detects the card being installed in place, and the clamping part clamps the wire harness terminal.

[0018] Step 4: The displacement actuator moves the molten material tank, so that the discharge cone is precisely aligned with the injection hole.

[0019] Step 5: Open the feed valve, inject an appropriate amount of brazing powder into the melting tank through the feed pipe, and then close the feed valve. The particle size of the brazing powder should be larger than the inner diameter of the discharge pipe.

[0020] Step 6: Start the heating wire to melt the brazing powder, and at the same time pressurize the melting tank through the pressurized air pipe to inject the molten brazing material into each tank.

[0021] Step 7: When the photoelectric probe detects a welding wire obstruction signal in the three-stage tank, the pressurization gas pipe stops pressurizing the melting tank, and the heating wire is de-energized.

[0022] Step 8: Keep the docked state still and allow the solder to cool and solidify naturally. After a preset time interval, the displacement actuator will drive the solder pot to move backward and reset.

[0023] Step 9: Release the clamping part and remove the brazed wire harness terminal from the work station slot.

[0024] Compared with existing technologies, the beneficial effects of this invention are: In this invention, the primary, secondary, and tertiary slots of the wire harness terminal are designed with a radially decreasing shape. This facilitates conductor insertion and provides a limiting effect through the tertiary slot, while the threaded wall of the primary slot enhances the bonding force of the solder. The isolation ring is engaged in the primary slot through its protrusion and secured with the wire clamping screw, forming a sealed structure that effectively prevents solder overflow. After pressurized injection, the solder completely fills the gaps between the conductor and each slot. A photoelectric probe monitors the filling status in real time to ensure no gaps, achieving a tight fit between the conductor and the terminal. This significantly reduces contact resistance, ensures stable conduction of the low-voltage wire harness, and avoids loosening or poor contact problems. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the device of the present invention.

[0026] Figure 2 This is a schematic diagram of the structure in this invention where the wire harness terminal is separated from the fixing frame.

[0027] Figure 3 for Figure 2 A magnified structural diagram of part A in the middle.

[0028] Figure 4 for Figure 2 A magnified structural diagram of section B in the middle.

[0029] Wherein: 1-Wire, 2-Conductor; 3-Wire harness terminal, 31-Conductor part, 32-Insulation part, 33-Firing screw, 311-Primary groove, 312-Secondary groove, 313-Tertiary groove, 314-Injection hole, 315-Threaded wall; 4-Isolation ring, 41-Protrusion; 5-Fixing frame, 51-Station groove, 511-Positioning groove, 52-Conductor slot, 53-Piston groove, 531-External air nozzle, 54-Displacement groove; 6-Pressure probe; 7-Piston disc, 71-Piston ring, 72-Connecting rod part; 8-Clamping part; 9-Melting tank, 91-Infeed pipe, 92-Outfeed pipe, 921-Outfeed cone, 93-Infeed valve, 94-Pressurized air pipe, 95-Heating wire; 10-Displacement actuator, 101-Displacement connecting rod; 11-Rubber sleeve; 12-Photoelectric probe. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0031] Example 1: This invention designs a low-voltage wire harness conductive brazing connection device, including wire harness terminals 3, isolation rings 4, fixing frames 5, pressure probes 6, clamping parts 8, molten material tanks 9, displacement actuators 10, photoelectric probes 12, and other components. The specific structural configuration is as follows: Combination Figure 1 , Figure 3 The conductor 1 is the main body of the low-voltage wire harness to be connected. After the insulation layer is stripped off at the end, the internal conductor 2 is exposed. The conductor 2 is inserted into the primary slot 311 and the secondary slot 312, serving as the core carrier for current conduction.

[0032] Combination Figure 1 , Figure 2 , Figure 3The wire harness terminal 3 is composed of a conductor portion 31 and an insulating portion 32. The insulating portion 32 surrounds the conductor portion 31, providing insulation and protection. The conductor portion 31 has a primary groove 311, a secondary groove 312, and a tertiary groove 313 extending axially. The radial dimensions of these three grooves decrease progressively. The radial dimensions of the primary groove 311 and the secondary groove 312 are larger than the radial dimension of the conductor 2 after stripping the wire 1, facilitating the insertion and assembly of the conductor 2. The radial dimension of the tertiary groove 313 is smaller than the radial dimension of the conductor 2, forming a limiting structure. The inner wall of the primary groove 311 has a threaded wall 315 to enhance the bonding stability with the solder. A solder injection hole 314 is provided on the circumferential side of the conductor portion 31, communicating with the interior of the primary groove 311 to provide a channel for solder injection. The wire harness terminal 3 is also equipped with a wire clamping screw 33 for securing the conductor 2 inserted into the secondary groove 312.

[0033] Combination Figure 1 , Figure 3 The isolation ring 4 is adapted to be installed at the outer opening of the primary groove 311 of the conductor section 31. The isolation ring 4 has a protrusion 41, which can be inserted into the primary groove 311 for positioning. The isolation ring 4 is sleeved around the conductor 2 and tightly abuts against the insulation layer of the wire 1 to form a sealed structure to prevent the molten brazing material from overflowing during the brazing process.

[0034] Combination Figure 1 , Figure 2 , Figure 4 The mounting bracket 5 has a through-hole workstation slot 51 and a conductor slot 52. The wire harness terminal 3 is clamped in the workstation slot 51, and one end of the conductor portion 31 protrudes from the conductor slot 52. A positioning groove 511 is provided inside the workstation slot 51 for precise positioning of the wire harness terminal 3. A pressure probe 6 is embedded in the end side wall of the workstation slot 51 to detect the clamping position of the wire harness terminal 3. Piston grooves 53 are provided on both side walls of the workstation slot 51. A piston disc 7 is disposed within the piston groove 53. The piston disc 7 includes a piston ring 71 that tightly abuts against the inner wall of the piston groove 53. The piston disc 7 is connected to a connecting rod portion 72, which is fixedly connected to the clamping portion 8. The mounting bracket 5 is also equipped with an external air nozzle 531 communicating with the piston groove 53. The external air nozzle 531 is connected to an air supply device via an air pipe to provide power for the movement of the clamping portion 8. A photoelectric probe 12 is installed around the periphery of the mounting bracket 5. The photoelectric probe 12 is axially aligned with the three-stage groove 313 of the conductor section 31 and is used to detect the filling status of the solder in the three-stage groove 313. The mounting bracket 5 also has a displacement groove 54 for guiding the movable installation of the solder pot 9.

[0035] Combination Figure 1 , Figure 4 The clamping part 8 is a set of pneumatic actuators, symmetrically arranged on both sides of the work station groove 51. It is linked with the piston disc 7 through the connecting rod part 72. Under the drive of the air supply equipment, it can realize the opening and closing action to clamp and fix or release the wire harness terminal 3 in the work station groove 51.

[0036] Combination Figure 1 , Figure 2 , Figure 4 The molten charge tank 9 is movably mounted on one side wall of the workstation slot 51 of the fixed frame 5, and its movement is guided by the displacement slot 54. The upper side of the molten charge tank 9 is connected to an inlet pipe 91, which is connected to the upstream feeding equipment via a guide hose for injecting brazing powder into the molten charge tank 9. An inlet valve 93 is installed on the inlet pipe 91 to control the opening and closing of the inlet channel. The lower side of the molten charge tank 9 is connected to an outlet pipe 92, which has an outlet cone 921 at its side end. The outlet cone 921 mates with the brazing injection hole 314 of the wire harness terminal 3 to achieve precise docking and injection. The molten charge tank 9 is also equipped with a pressurized gas pipe 94, located downstream of the inlet valve 93, and connected to an upstream booster pump via a guide hose, which can inject pressurized gas into the molten charge tank 9. The melting tank 9 is also equipped with a heating wire 95. The heating wire 95 is inserted downward into the discharge pipe 92 and extends from the inner cavity of the melting tank 9 to the position of the discharge cone 921. It is used to heat and melt the brazing powder to ensure the brazing supply effect to the primary tank 311 and the secondary tank 312.

[0037] Combination Figure 1 , Figure 2 , Figure 4 The displacement actuator 10 is mounted on the fixed frame 5, and the output end is provided with a displacement connecting rod 101. The side end of the displacement connecting rod 101 is fixedly connected to the melting tank 9, which can drive the melting tank 9 to move in a direction along the displacement groove 54, so as to realize the docking or separation of the discharge cone 921 and the injection hole 314.

[0038] In addition, the rubber sleeve 11 is a flexible protective component. After brazing, it is sleeved at the connection position between the wire 1 and the wire harness terminal 3 to cover the welding area and play the roles of insulation, corrosion prevention and mechanical protection.

[0039] Example 2: This invention designs a low-voltage wire harness conductive brazing connection method, the specific steps of which are as follows: I. Preliminary Preparation and Pre-fixation Procedures First, the end of the wire 1 is treated by stripping the insulation layer from the end of the wire 1 to expose the inner conductor 2. Then, the isolation ring 4 is fitted around the exposed conductor 2 of the wire 1 after stripping, ensuring that the protrusion 41 of the isolation ring 4 faces the conductor portion 31 of the wire harness terminal 3.

[0040] Secure the wire harness terminal 3, and slowly insert the stripped conductor 2 into the first-level groove 311 and the second-level groove 312 of the conductor section 31, ensuring that the conductor 2 is fully in contact with the inner walls of the first-level groove 311 and the second-level groove 312, and that the end of the conductor 2 extends to a position close to the third-level groove 313.

[0041] Tightening the wire clamping screw 33 on the wire harness terminal 3 pre-fixes the conductor 2 inserted into the secondary slot 312, ensuring the conductor 2 remains stable in the primary slot 311 and the secondary slot 312. Simultaneously, the tightening force of the wire clamping screw 33 tightly clamps the isolation ring 4 between the insulation layer of the conductor 1 and the opening of the primary slot 311, forming a sealed structure to prevent subsequent solder from leaking out from the gap.

[0042] II. Wiring Harness Terminal Positioning and Clamping The pre-fixed wire harness terminal 3 is aligned with the work station slot 51 of the fixing frame 5 and inserted, so that the insulating part 32 of the wire harness terminal 3 is precisely fitted with the positioning slot 511 inside the work station slot 51, thereby achieving the initial positioning of the wire harness terminal 3.

[0043] When the pressure probe 6 embedded in the end wall of the workstation slot 51 detects the pressure signal of the wire harness terminal 3 being clamped in place, the pressure probe 6 transmits the signal to the control unit, and the control unit triggers the clamping action command.

[0044] The gas supply device introduces gas into the piston groove 53 through the external gas nozzle 531. The gas pushes the piston disc 7 to move along the inner wall of the piston groove 53. The piston ring 71 of the piston disc 7 fits tightly against the inner wall of the piston groove 53 to ensure airtightness. The piston disc 7 drives the connecting rod 72 to move synchronously. The connecting rod 72 drives the clamping parts 8 on both sides of the station groove 51 to clamp towards the wire harness terminal 3 until the clamping parts 8 fit tightly against the insulating part 32 of the wire harness terminal 3, firmly fixing the wire harness terminal 3 in the station groove 51 and ensuring the stability of subsequent brazing operations.

[0045] III. Alignment and Adjustment of the Melting Pot The control unit starts the displacement driver 10, which drives the molten pot 9 to move directionally along the displacement groove 54 of the fixed frame 5 via the displacement connecting rod 101.

[0046] During the movement, the moving direction of the molten material tank 9 is adjusted with the soldering hole 314 of the wire harness terminal 3 as the alignment reference, so that the discharge cone 921 at the end of the discharge pipe 92 of the molten material tank 9 is precisely aligned with the soldering hole 314, and finally the discharge cone 921 and the soldering hole 314 are tightly connected to form a sealed connection to avoid leakage when the soldering material is injected.

[0047] IV. Injection and Heating / Melting of Brazing Powder Open the feed valve 93 on the feed pipe 91 and inject an appropriate amount of brazing powder into the inner cavity of the molten material tank 9 through the feed pipe 91. During the injection process, ensure that the brazing powder is evenly distributed in the molten material tank 9 to avoid accumulation. The particle size of the brazing powder is larger than the inner diameter of the discharge pipe 92.

[0048] After the brazing powder is injected, the feed valve 93 is closed to cut off the feed channel. At the same time, the heating wire 95 configured in the melting tank 9 is started. The heating wire 95 extends from the inner cavity of the melting tank 9 to the discharge cone 921 of the discharge pipe 92 to heat the brazing powder in the melting tank 9, so that the brazing powder gradually melts to form a uniform molten brazing material.

[0049] During the heating process of the heating wire 95, pressurized gas is injected into the inner cavity of the molten material tank 9 through the pressurized gas pipe 94 to provide power support for the subsequent injection of the molten brazing material and ensure that the molten brazing material can be smoothly filled into the target slot.

[0050] V. Filling and Testing of Brazing Filler Material Under the continuous action of pressurized gas, the solder in the molten material tank 9 flows into the primary groove 311 of the wire harness terminal 3 through the discharge pipe 92, the discharge cone 921, and the solder injection hole 314 in sequence. Then, it gradually diffuses along the primary groove 311 to the secondary groove 312 and the tertiary groove 313, fully filling the gap between the primary groove 311, the secondary groove 312, the tertiary groove 313 and the conductor 2, so as to achieve full fit between the conductor 2 and the conductor part 31.

[0051] The photoelectric probe 12 on the periphery of the fixed frame 5 detects the state inside the three-stage groove 313 in real time. Since the photoelectric probe 12 is axially aligned with the three-stage groove 313, when the three-stage groove 313 is completely filled with solder, the solder will block the detection light of the photoelectric probe 12, and the photoelectric probe 12 will then send a filling completion signal to the control unit.

[0052] VI. Stopping Operations and Cooling After receiving the filling completion signal from the photoelectric probe 12, the control unit immediately controls the pressurization pipe 94 to stop injecting pressurized gas into the inner cavity of the melting tank 9, and at the same time cuts off the power supply to the heating wire 95 to stop the heating operation.

[0053] The discharge cone 921 of the molten material tank 9 is kept in contact with the solder injection hole 314. After a preset time, the solder in the first-stage groove 311, the second-stage groove 312, and the third-stage groove 313 is allowed to cool and solidify naturally, forming a stable brazing connection structure to ensure reliable conduction between the conductor 2 and the conductor part 31 of the wire harness terminal 3.

[0054] VII. Equipment Reset and Workpiece Removal After the solder has completely solidified, the control unit starts the displacement driver 10. The displacement driver 10 drives the molten material tank 9 to move in the opposite direction along the displacement groove 54, so that the discharge cone 921 separates from the soldering hole 314, and the molten material tank 9 returns to its initial position.

[0055] The control unit controls the air supply equipment to stop supplying air to the piston groove 53. Under the action of the reset force, the piston disc 7 drives the connecting rod 72 and the clamping part 8 to move in the opposite direction, and the clamping part 8 releases the clamping state on the wire harness terminal 3.

[0056] The operator holds the insulating part 32 of the wire harness terminal 3 and removes the wire harness terminal 3 from the work station slot 51 to complete the core brazing process.

[0057] VIII. Subsequent Protective Measures After removing the brazed workpiece, select a suitable rubber sleeve 11 and place the rubber sleeve 11 on the connection position between the wire 1 and the wire harness terminal 3. Push the rubber sleeve 11 forcefully to completely cover the welding area, forming a protective barrier for the welding part and preventing external environmental factors from corroding the welding part. At the same time, it improves the insulation performance and mechanical protection capability of the connection part.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A low-voltage wire harness conductive brazing connection device, characterized in that: Includes a wire harness terminal (3) adapted to a brazing connection device. The conductor portion (31) of the wire harness terminal (3) is provided with a first-level groove (311), a second-level groove (312), and a third-level groove (313) that are axially penetrating and have decreasing radial dimensions. The first-level groove (311) is provided with a threaded wall (315). The conductor portion (31) is provided with a brazing hole (314) communicating with the first-level groove (311) on the circumferential side. The conductor (2) after stripping the wire at the side end of the wire (1) is inserted into the first-level groove (311) and the second-level groove (312). A partition ring (4) is disposed at the opening position outside the primary groove (311) of the conductor part (31), and the partition ring (4) is sleeved around the conductor (2) and abuts against the insulation layer of the wire (1). The brazing connection device is equipped with a fixing frame (5), which has a through work station groove (51) and a conductor slot (52). The wire harness terminal (3) is clamped in the work station groove (51), and one end of the conductor part (31) protrudes out of the conductor slot (52). The fixing frame (5) is also equipped with a photoelectric probe (12) that is axially aligned with the three-level groove (313) of the conductor part (31). A pressure probe (6) for detecting the clamping position of the wire harness terminal (3) is embedded in the end side wall of the work station slot (51). A set of pneumatic clamping parts (8) is provided on both side walls of the work station slot (51). A melting tank (9) is movably arranged on one side wall of the work station slot (51). A displacement driver (10) for driving the melting tank (9) to move in a directional direction is provided on the fixed frame (5). The upper side of the melting tank (9) is connected to the feed pipe (91), and the lower side of the melting tank (9) is connected to the discharge pipe (92). The side end of the discharge pipe (92) is provided with a discharge cone (921) that cooperates with the injection hole (314). The feed pipe (91) is equipped with a feed valve (93) and a pressurized gas pipe (94) located downstream of the feed valve (93) and injecting pressurized gas into the melting tank (9). The melting tank (9) is also equipped with a heating wire (95) that is inserted downward into the discharge pipe (92).

2. The low-voltage wire harness conductive brazing connection device according to claim 1, characterized in that: The radial dimensions of the first-level groove (311) and the second-level groove (312) are greater than the radial dimensions of the conductor (2) after stripping the wire at the side end of the conductor (1), and the radial dimension of the third-level groove (313) is less than the radial dimension of the conductor (2) after stripping the wire at the side end of the conductor (1).

3. The low-voltage wire harness conductive brazing connection device according to claim 1, characterized in that: The partition ring (4) is provided with a protrusion (41) that can be inserted into the primary groove (311), and the wire harness terminal (3) is provided with a wire clamping screw (33) for fixing the position of the insertion into the secondary groove (312).

4. The low-voltage wire harness conductive brazing connection device according to claim 1, characterized in that: The inner side of the work station slot (51) is provided with a positioning slot (511) for positioning the wire harness terminal (3); The work station slot (51) has piston slots (53) on both sides. A piston disc (7) is arranged in the piston slot (53). The piston disc (7) includes a piston ring (71) that abuts against the inner wall of the piston slot (53). The piston disc (7) is connected to a connecting rod (72). The connecting rod (72) is connected to a clamping part (8). The mounting bracket (5) is also equipped with an external air nozzle (531) that communicates with the piston groove (53), and the external air nozzle (531) is connected to the air supply device through an air pipe.

5. The low-voltage wire harness conductive brazing connection device according to claim 1, characterized in that: The feed pipe (91) is connected to the upstream feeding equipment via a feed hose, and the pressurized air pipe (94) is connected to the upstream booster pump via a pressurized air hose.

6. The low-voltage wire harness conductive brazing connection device according to claim 1, characterized in that: The fixing frame (5) is provided with a displacement groove (54) for guiding the movable installation of the molten material tank (9). The output end of the displacement driver (10) is provided with a displacement connecting rod (101), and the side end of the displacement connecting rod (101) is fixedly connected to the molten material tank (9).

7. The low-voltage wire harness conductive brazing connection device according to claim 1, characterized in that: The heating wire (95) extends from the inner cavity of the melting tank (9) to the discharge cone (921) of the discharge pipe (92).

8. A method for conductive brazing connection of a low-voltage wire harness, characterized in that, A low-voltage wire harness conductive brazing connection device applied to any one of claims 1 to 7 includes the following: Step 1: Strip the insulation layer from the end of the conductor (1) and place the isolation ring (4) around the exposed conductor (2); Step 2: Align the conductor (2) with the primary slot (311) and secondary slot (312) of the wire harness terminal (3) and insert it to complete the pre-fixation. Then, snap the wire harness terminal (3) into the work station slot (51) of the fixing frame (5). Step 3: The pressure probe (6) detects the card being installed, and the clamping part (8) clamps the wire harness terminal (3). Step 4: The displacement actuator (10) drives the melting tank (9) to move, so that the discharge cone (921) and the injection hole (314) are precisely aligned; Step 5: Open the feed valve (93), inject an appropriate amount of brazing powder into the melting tank (9) through the feed pipe (91), and then close the feed valve (93). The particle size of the brazing powder is larger than the inner diameter of the discharge pipe (92). Step 6: Start the heating wire (95) to melt the brazing powder, and at the same time pressurize the melting tank (9) through the pressurized air pipe (94) to inject the molten brazing material into each tank; Step 7: When the photoelectric probe (12) detects a welding wire blocking signal in the three-stage tank (313), the pressurization pipe (94) stops pressurizing the melting tank (9), and the heating wire (95) is de-energized. Step 8: Keep the docked state still and wait for the solder to cool and solidify naturally. After a preset time interval, the displacement driver (10) drives the solder tank (9) to move backward and reset. Step 9: The clamping part (8) is released from the clamp and the brazed wire harness terminal (3) is taken out from the work station slot (51).

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