Open circuit protection for diverter rack quench inductor

Abstract

This utility model proposes an open-circuit protection device for a steering gear rack quenching inductor, relating to the field of heat treatment technology. It includes a quenching device and a protection device. The quenching device has a first electrode and a second electrode spaced apart. The protection device includes a first conductive bus, a second conductive bus, and a spiral coil. One end of the first conductive bus is electrically connected to the first electrode, and one end of the second conductive bus is electrically connected to the second electrode. The other ends of the first and second conductive buses are respectively used to connect to a power supply. Both ends of the spiral coil are electrically connected to the first and second conductive buses, respectively. The impedance of the spiral coil is greater than the impedance of the working circuit formed by the first electrode, the steering gear rack, and the second electrode. By connecting a high-impedance spiral coil in parallel with the electrode circuit, an automatically switching dual path is formed: during normal operation, the current flows through the electrode-rack path; during open circuit, the current automatically switches to the spiral coil path, effectively limiting the current and suppressing overvoltage and overcurrent, thus protecting the power supply components.

Description

Technical Field

[0001] This utility model relates to the field of heat treatment equipment technology, and in particular to an open-circuit protection device for a steering gear rack quenching inductor. Background Technology

[0002] In the automotive steering system manufacturing field, the reliability of rack and pinion steering systems is directly related to driving safety. The steering rack, as a key transmission component, requires a quenching process to ensure its surface hardness. Currently, the industry commonly uses high-frequency induction hardening technology to strengthen the rack surface.

[0003] The existing technologies mainly include the following two quenching methods:

[0004] Traditional induction coil heating involves placing a rack within an induction coil and heating it using the principle of electromagnetic induction. However, this method has a significant drawback: the irregular shape of the rack's teeth leads to uneven heating at the tooth roots, making it difficult to achieve the desired quenching effect.

[0005] Patent CN104313290A discloses a high-frequency quenching device and method for a steering gear rack. The device forms a heating circuit with a positive electrode, a steering gear rack, and a negative electrode to heat the steering gear rack itself. At the same time, an induction heater works. Based on the skin effect, the induction heater generates an induced current that converges on the rack surface to generate heat. The rack is heated evenly and can quickly reach the temperature required for high-frequency quenching, ensuring the heating effect of the rack.

[0006] However, the applicant discovered some defects in actual use. Specifically, during the installation of the steering rack, the rack is placed horizontally between the positive and negative electrodes, and a clamping block is used to bring the rack into contact with the electrodes. However, the clamping block is usually driven by a cylinder, which can easily lead to poor contact between the rack and the electrodes due to mechanical vibration or insufficient cylinder pressure. When the heating circuit is open, the high-frequency power supply will generate overvoltage spikes because energy cannot be released, or overcurrent surges may occur due to control loop malfunction. The power devices (such as IGBTs) of the high-frequency power supply will be subjected to overcurrent surges, leading to breakdown and damage. Power supply failures can cause the entire production line to stop, severely affecting production efficiency. Utility Model Content

[0007] In view of this, this utility model proposes an open-circuit protection device for the quenching inductor of the steering gear rack to solve the technical problem that the power devices of the high-frequency power supply will be subjected to large current surges when the heating circuit of the existing quenching equipment is open, resulting in damage to the high-frequency power supply.

[0008] The technical solution of this utility model is implemented as follows:

[0009] This utility model provides an open-circuit protection device for a steering gear rack quenching sensor, comprising:

[0010] A quenching apparatus having a first electrode and a second electrode spaced apart;

[0011] The protection device includes a first conductive bus, a second conductive bus, and a spiral coil. One end of the first conductive bus is electrically connected to a first electrode, and the other end is used to connect to a power source. One end of the second conductive bus is electrically connected to a second electrode, and the other end is used to connect to a power source. The two ends of the spiral coil are electrically connected to the first conductive bus and the second conductive bus, respectively. The impedance of the spiral coil is greater than the impedance of the working circuit formed by the first electrode, the steering gear rack, and the second electrode.

[0012] Based on the above technical solution, preferably, the inductive reactance of the spiral coil is at least twice the working circuit impedance.

[0013] Based on the above technical solution, preferably, a first insulating layer is provided between the first conductive bus and the second conductive bus, a first cooling pipe is provided on the side of the first conductive bus away from the first insulating layer, and a second cooling pipe is provided on the side of the second conductive bus away from the first insulating layer. The first cooling pipe, the first conductive bus, the first insulating layer, the second conductive bus and the second cooling pipe are fixedly connected to form an integral stacked structure by insulating fasteners.

[0014] Based on the above technical solution, preferably, the first cooling pipe and the second cooling pipe are both U-shaped structures, laid parallel to each other along the length direction of the corresponding conductive busbar, the U-shaped bend of each cooling pipe is located at one end of the conductive busbar, the two straight pipe sections extend along the length direction of the conductive busbar, and the ends of the two straight pipe sections are connected to the first liquid cooling interface.

[0015] Based on the above technical solution, preferably, the spiral coil is located on one side of the overall stacked structure. The spiral coil is wound with a multi-turn hollow metal tube. The two ends of the spiral coil are respectively connected to a third cooling tube and a fourth cooling tube. The end of the third cooling tube away from the spiral coil is electrically connected to the first conductive busbar. The end of the fourth cooling tube away from the spiral coil is electrically connected to the second conductive busbar. The ends of the third cooling tube and the fourth cooling tube away from the spiral coil are respectively connected to a second coolant interface.

[0016] Based on the above technical solution, preferably, a first conductive connector is fixedly provided between the third cooling pipe and the first conductive busbar, and a second conductive connector is fixedly provided between the fourth cooling pipe and the second conductive busbar.

[0017] Based on the above technical solution, preferably, the quenching device further includes a mounting base, a first fixed row, a second fixed row, and a second insulating layer. The first fixed row is fixedly disposed on the mounting base, with one end electrically connected to the first conductive row and the other end electrically connected to the first electrode. The second fixed row is fixedly disposed parallel to the top surface of the first fixed row, and the length of the second fixed row is greater than the length of the first fixed row. The second insulating layer is disposed between the first fixed row and the second fixed row. One end of the second fixed row is electrically connected to the second conductive row, and the other end is electrically connected to the second electrode.

[0018] Based on the above technical solution, preferably, the first electrode and the second electrode are slidably mounted on the first fixed row and the second fixed row, respectively, and the mounting distance between the two electrodes can be changed by sliding adjustment.

[0019] Based on the above technical solution, preferably, the quenching device further includes a water spray box, which is disposed between the first electrode and the second electrode, with an open bottom and sealed and fixedly connected to the first fixed row. The top surface of the water spray box is provided with several water spray holes. Several cooling water channels are provided at intervals along the length direction of the water spray box in the mounting base and the first fixed row. The cooling water channels are connected to the inner cavity of the water spray box. The side of the mounting base is provided with a water inlet connector connected to the cooling water channels.

[0020] Based on the above technical solution, preferably, a baffle is horizontally arranged inside the water spray box along its length direction. The baffle divides the inner cavity of the water spray box into an upper cavity and a lower cavity that are interconnected. The water spray holes are evenly distributed on the top surface of the water spray box corresponding to the upper cavity. The outlet of the cooling water channel is connected to the lower cavity, and the outlet of the cooling water channel is directly opposite the baffle in the vertical direction.

[0021] The present invention has the following advantages over the prior art:

[0022] (1) By connecting a high-impedance spiral coil 23 in parallel in the electrode circuit, a dual current path with automatic switching characteristics is constructed. Under normal operating conditions, the current preferentially flows through the low-impedance electrode-rack path to ensure the quenching effect; when the electrode contact is poor or open-circuited, the current automatically switches to the high-impedance spiral coil path, effectively limiting the circuit current and preventing the high-frequency power supply from generating overvoltage spikes or overcurrent impacts due to the inability to release energy, thereby protecting the high-frequency power supply devices from damage. This protection device has a simple and reliable structure, requires no additional control module, and has significant advantages such as low cost and easy maintenance.

[0023] (2) The first cooling pipe, the first conductive busbar, the first insulating layer, the second conductive busbar and the second cooling pipe are fixedly connected by insulating fasteners to form an integral stacked structure, thereby forming a compact integral module. The compact structure saves installation space; secondly, the integrated design improves the reliability of the system; thirdly, the double-sided cooling arrangement significantly improves heat dissipation efficiency. This modular design also facilitates the maintenance and replacement of the equipment.

[0024] (3) The layered fixed row not only provides stable electrode support but also optimizes the current path. At the same time, the second insulating layer effectively prevents the risk of short circuit between electrodes. This modular electrode fixing structure facilitates installation and commissioning and also improves the ease of equipment maintenance.

[0025] (4) By setting baffles inside the water spray box, the cooling water impacts the baffles vertically from the water outlet. After being reflected by the baffles, the flow velocity is reduced, effectively eliminating the directional impact of direct water flow on specific water spray holes. The lower cavity acts as a buffer cavity, which can reduce the water flow field. The upper cavity establishes a static pressure zone through a connected design, ensuring that the pressure difference at the outlet of each water spray hole is as small as possible, thereby achieving the consistency of the jet flow velocity of each water spray hole and thus ensuring the consistency of quenching. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a three-dimensional structural schematic diagram of the anti-open circuit protection device for the steering gear rack quenching sensor disclosed in this utility model.

[0028] Figure 2 This is a three-dimensional structural diagram of the protective device disclosed in this utility model;

[0029] Figure 3 This is a three-dimensional structural diagram of the quenching device disclosed in this utility model.

[0030] Figure 4 This is a planar sectional view of the quenching device disclosed in this utility model;

[0031] Figure label:

[0032] S, Steering rack; 1, Quenching device; 11, First electrode; 12, Second electrode; 13, Mounting base; 14, First fixed row; 15, Second fixed row; 16, Second insulating layer; 17, Water spray box; 171, Water spray hole; 131, Cooling water channel; 132, Water inlet connector; 18, Baffle plate; 172, Upper cavity; 173, Lower cavity;

[0033] 2. Protective device; 20. Insulating fastener; 21. First conductive bar; 22. Second conductive bar; 23. Spiral coil; 24. First insulating layer; 25. First cooling pipe; 26. Second cooling pipe; P1. First liquid cooling interface; 27. Third cooling pipe; 28. Fourth cooling pipe; P2. Second coolant interface; 29. ​​First conductive connector; 30. Second conductive connector. Detailed Implementation

[0034] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0035] like Figure 1 As shown, combined with Figure 2 This utility model embodiment discloses an open-circuit protection device for a steering gear rack quenching sensor, including a quenching device 1 and a protection device 2.

[0036] The quenching device 1 has a first electrode 11 and a second electrode 12 arranged at intervals. These two electrodes constitute the basic working components of the quenching circuit. They form a current path through contact with the steering rack S, thereby heating the steering rack.

[0037] In actual operation, the steering rack S spans between the first electrode 11 and the second electrode 12, and a clamping force is applied to the steering rack by a clamping mechanism (such as a cylinder) so that the steering rack contacts the first electrode 11 and the second electrode 12.

[0038] Mechanical vibration or insufficient cylinder pressure can easily lead to poor contact between the steering rack and the first electrode 11 and the second electrode 12. When the heating circuit is open, the high-frequency power supply will generate overvoltage spikes because the energy cannot be released, or overcurrent surges will be caused by the control loop malfunction. The power devices of the high-frequency power supply (such as IGBTs) will be subjected to overcurrent surges, resulting in breakdown and damage. Power supply failure will cause the entire production line to stop, seriously affecting production efficiency.

[0039] To address the aforementioned problems, this embodiment includes a protection device 2. Specifically, the protection device 2 comprises a first conductive bus 21, a second conductive bus 22, and a spiral coil 23. One end of the first conductive bus 21 is connected to the first electrode 11, and the other end is connected to a power source. One end of the second conductive bus 22 is connected to the second electrode 12, and the other end is connected to a power source. These two conductive buses form a current transmission channel from the power source to the electrode.

[0040] The spiral coil 23 is the core component of the protection device 2, with its two ends connected to the first conductive bus 21 and the second conductive bus 22, respectively. This connection method allows the spiral coil 23 to form a parallel relationship with the electrode working circuit. In this embodiment, the impedance of the spiral coil 23 must be greater than the impedance of the working circuit composed of the electrode and the rack.

[0041] By connecting a high-impedance spiral coil 23 in parallel in the electrode circuit, a dual current path with automatic switching characteristics is constructed. Under normal operating conditions, the current preferentially flows through the low-impedance electrode-rack path to ensure the quenching effect. When there is poor electrode contact or an open circuit, the current automatically switches to the high-impedance spiral coil path, effectively limiting the circuit current and preventing overvoltage spikes or overcurrent surges caused by the inability to release energy in the high-frequency power supply, thereby protecting the high-frequency power supply components from damage. This protection device has a simple and reliable structure, requires no additional control module, and has significant advantages such as low cost and easy maintenance.

[0042] In the above embodiments, the first electrode 11, the second electrode 12, the first conductive bus 21, and the second conductive bus 22 are all made of copper, which can achieve high conductivity and high heat dissipation performance.

[0043] As one implementation, the impedance value of the helical coil 23 is at least twice the impedance of the working circuit.

[0044] Setting the impedance ratio to more than 2 times is based on the following considerations: First, a 2-fold impedance difference ensures that under normal operating conditions, the shunt current through the spiral coil 23 does not exceed 1 / 3 of the total current, ensuring that most of the energy is effectively used for rack heating; Second, when an open circuit fault occurs in the working circuit, this impedance ratio can strictly limit the transient current to within 1.5 times the rated value of the power supply, ensuring both protection effectiveness and preventing overload of the protection components themselves.

[0045] In actual production, operators can precisely design the parameters of the spiral coil 23 (such as the number of turns, wire diameter, etc.) based on the specific working circuit impedance measurement value to ensure that the impedance requirement is met by more than twice.

[0046] In some implementations, a first insulating layer 24 is provided between the first conductive bus 21 and the second conductive bus 22, which effectively isolates the two conductive buses and prevents short circuits. In this embodiment, the first insulating layer 24 can be made of commercially available insulating materials. A first cooling pipe 25 is provided on the side of the first conductive bus 21 away from the first insulating layer 24, and a second cooling pipe 26 is provided on the side of the second conductive bus 22 away from the first insulating layer 24. This symmetrical arrangement enables uniform heat dissipation. The first cooling pipe 25, the first conductive bus 21, the first insulating layer 24, the second conductive bus 22, and the second cooling pipe 26 are fixedly connected by insulating fasteners 20 to form an integral stacked structure. This allows the five-layer structure to form a compact integrated module, saving installation space. Secondly, the integrated design improves the reliability of the system. Furthermore, the double-sided cooling arrangement significantly improves the heat dissipation efficiency of the conductive buses. This modular design also facilitates equipment maintenance and replacement; when a single component is damaged, the entire unit can be disassembled and repaired.

[0047] In this embodiment, both the first cooling pipe 25 and the second cooling pipe 26 are made of copper, which can improve heat dissipation performance.

[0048] In some implementations, the first cooling pipe 25 and the second cooling pipe 26 are both U-shaped structures, laid parallel to each other along the length of the corresponding conductive busbar. The U-shaped bend of each cooling pipe is located at one end of the conductive busbar, and the two straight pipe sections extend along the length of the conductive busbar. The ends of the two straight pipe sections are connected to the first liquid cooling interface P1.

[0049] By designing the first cooling pipe 25 and the second cooling pipe 26 as a U-shaped structure, this specially shaped pipe is laid parallel to the length of the conductive bar, forming an efficient cooling circuit layout.

[0050] The U-shaped bend is located at one end of the busbar, allowing the two straight tube sections to extend longitudinally along the busbar. This arrangement maximizes the contact area between the cooling tubes and the busbar. Both straight tube sections are connected to a first liquid cooling interface P1 at their ends. This symmetrical interface design facilitates the connection and disassembly of the cooling system.

[0051] In this embodiment, the spiral coil 23 is located on one side of the stacked structure. The spiral coil 23 is wound with a multi-turn hollow metal tube. This design not only ensures electromagnetic performance but also achieves effective cooling.

[0052] The two ends of the spiral coil 23 are respectively connected to a third cooling pipe 27 and a fourth cooling pipe 28. The end of the third cooling pipe 27 away from the spiral coil 23 is electrically connected to the first conductive bus 21. The end of the fourth cooling pipe 28 away from the spiral coil 23 is electrically connected to the second conductive bus 22. The ends of the third cooling pipe 27 and the fourth cooling pipe 28 away from the spiral coil 23 are respectively connected to the second coolant interface P2.

[0053] The third cooling pipe 27 is electrically connected to the first conductive bus 21, and the fourth cooling pipe 28 is electrically connected to the second conductive bus 22. This connection method ensures electrical conductivity while maintaining structural integrity. The second coolant inlet P2 at the end of the cooling pipe facilitates the circulation of coolant into the spiral coil 23, cooling the entire spiral coil 23 during the heating process and preventing the spiral coil 23 from dry burning.

[0054] Since the surface of the first conductive busbar 21 has a U-shaped first cooling pipe 25 and the surface of the second conductive busbar 22 has a U-shaped second cooling pipe 26, in order to facilitate the electrical connection between the third cooling pipe 27 and the first conductive busbar 21 and the fourth cooling pipe 28 and the second conductive busbar 22, the protection device 2 of this embodiment is also provided with a first conductive connector 29 and a second conductive connector 30. The third cooling pipe 27 is fixedly connected to the first conductive busbar 21 through the first conductive connector 29, and the fourth cooling pipe 28 is fixedly connected to the second conductive busbar 22 through the second conductive connector 30.

[0055] In some embodiments, the first conductive connector 29 is welded to the third cooling pipe 27 by welding, and then the first conductive connector 29 is placed on the surface of the first conductive bus 21 and the two are locked together by bolts. Correspondingly, the second conductive connector 30 is welded to the fourth cooling pipe 28 by welding, and then the second conductive connector 30 is placed on the surface of the second conductive bus 22 and the two are locked together by bolts.

[0056] This embodiment also discloses the specific structural configuration of the quenching device 1, as detailed in the appendix. Figure 3 and 4 As shown, the quenching device 1 also includes a mounting base 13, a first fixed row 14, a second fixed row 15, and a second insulating layer 16.

[0057] The first fixed row 14 is directly fixed to the mounting base 13, forming a basic support layer. Its two ends are respectively connected to the first conductive row 21 and the first electrode 11, forming a complete current path. The second fixed row 15 is arranged parallel above the first fixed row 14, and is electrically isolated by the second insulating layer 16. One end of the second fixed row 15 is electrically connected to the second conductive row 22, and the other end is electrically connected to the second electrode 12.

[0058] Since the first conductive busbar 21 and the second conductive busbar 22 are stacked, the first fixed busbar 14 and the second fixed busbar 15 are also stacked, which facilitates the fixed connection between the fixed busbar and the conductive busbar.

[0059] The length of the second fixed row 15 is greater than that of the first fixed row 14. This differentiated design provides a larger adjustment space for the electrode connection, allowing the first electrode 11 and the second electrode 12 to be arranged at intervals in the horizontal direction, which facilitates the connection of the steering rack between the first electrode 11 and the second electrode 12.

[0060] The layered arrangement of the fixed bars not only provides stable electrode support but also optimizes the current path. Furthermore, the second insulating layer 16 effectively prevents the risk of short circuits between electrodes. This modular electrode fixing structure facilitates installation and commissioning and improves the ease of equipment maintenance.

[0061] In some implementations, the first electrode 11 and the second electrode 12 are slidably mounted on the first fixed row 14 and the second fixed row 15, respectively, and the mounting distance between the two electrodes can be changed by sliding adjustment.

[0062] Taking the first electrode 11 as an example, a strip-shaped hole is provided on the surface of the first electrode 11 along the length direction of the first fixed row 14. By installing a locking bolt in the strip-shaped hole, the position of the first electrode 11 relative to the first fixed row 14 can be adjusted, and then the locking bolt can be used to fix the first electrode 11 and the first fixed row 14.

[0063] The positions of the first electrode 11 and the second electrode 12 are adjustable, allowing for adaptation to different steering rack lengths. In this embodiment, the top end of the first electrode 11 is inserted into a tooth groove at one end of the steering rack, and the top end of the second electrode 12 is inserted into a tooth groove at the other end of the steering rack.

[0064] It is worth noting that the first electrode 11 and the second electrode 12 have opposite polarities. For example, the first electrode 11 is the positive electrode and the second electrode 12 is the negative electrode. The circuit formed by the first electrode 11, the steering rack and the second electrode 12 is filled with alternating current, and the direction of the current changes with the time of the cycle.

[0065] To achieve cooling during the quenching process of the steering gear rack, the quenching device 1 in this embodiment also includes a water spray box 17. The water spray box 17 is disposed between the first electrode 11 and the second electrode 12, with an open bottom and sealed and fixedly connected to the first fixed row 14. The top surface of the water spray box 17 is provided with a plurality of water spray holes 171. The mounting base 13 and the first fixed row 14 are provided with a plurality of cooling water channels 131 spaced apart along the length direction of the water spray box 17. The cooling water channels 131 are connected to the inner cavity of the water spray box 17. The side of the mounting base 13 is provided with a water inlet connector 132 connected to the cooling water channels 131.

[0066] Using the above technical solution, cooling water is introduced through the water inlet connector 132, and the cooling water enters the interior of the spray box 17 through the cooling water channel 131, and is then sprayed out through the spray hole 171 at the top of the spray box 17, so as to achieve rapid cooling of the surface of the steering gear rack during the quenching process. This rapid cooling causes the surface layer of the steel to undergo a martensitic phase transformation, which increases the hardness and significantly enhances the wear resistance and fatigue strength of the rack.

[0067] In some embodiments, a baffle 18 is horizontally arranged inside the water spray box 17 along its length direction. The baffle 18 divides the inner cavity of the water spray box 17 into an upper cavity 172 and a lower cavity 173 that are interconnected. Water spray holes 171 are evenly distributed on the top surface of the water spray box 17 corresponding to the upper cavity 172. The outlet of the cooling water channel 131 is connected to the lower cavity 173, and the outlet of the cooling water channel 131 is directly opposite the baffle 18 in the vertical direction.

[0068] This design ensures that the cooling water impacts the baffle 18 vertically from the water outlet, and its velocity is reduced after being reflected by the baffle 18, effectively eliminating the directional impact of the direct water flow on the specific spray holes 171. The lower cavity 173 acts as a buffer cavity, reducing the water flow field, while the upper cavity 172 establishes a static pressure zone through a connected design, ensuring that the pressure difference at the outlet of each spray hole 171 is as small as possible, thereby achieving consistent jet velocity across all spray holes 171 and ensuring consistent quenching.

[0069] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An open-circuit protection device (2) for a steering gear rack quenching inductor, characterized in that, include: The quenching device (1) has a first electrode (11) and a second electrode (12) arranged at intervals; The protection device (2) includes a first conductive bus (21), a second conductive bus (22) and a spiral coil (23). One end of the first conductive bus (21) is electrically connected to the first electrode (11), and the other end is used to connect to the power supply. One end of the second conductive bus (22) is electrically connected to the second electrode (12), and the other end is used to connect to the power supply. The two ends of the spiral coil (23) are electrically connected to the first conductive bus (21) and the second conductive bus (22) respectively. The impedance of the spiral coil (23) is greater than the impedance of the working circuit formed by the first electrode (11), the steering rack and the second electrode (12).

2. The anti-open-circuit protection device (2) for the steering gear rack quenching sensor as described in claim 1, characterized in that: The impedance of the spiral coil (23) is at least twice the impedance of the working circuit.

3. The anti-open-circuit protection device (2) for the steering gear rack quenching sensor as described in claim 1, characterized in that: A first insulating layer (24) is provided between the first conductive bus (21) and the second conductive bus (22). A first cooling pipe (25) is provided on the side of the first conductive bus (21) away from the first insulating layer (24). A second cooling pipe (26) is provided on the side of the second conductive bus (22) away from the first insulating layer (24). The first cooling pipe (25), the first conductive bus (21), the first insulating layer (24), the second conductive bus (22) and the second cooling pipe (26) are fixedly connected to form an integral stacked structure by insulating fasteners (20).

4. The anti-open-circuit protection device (2) for the steering gear rack quenching sensor as described in claim 3, characterized in that: The first cooling pipe (25) and the second cooling pipe (26) are both U-shaped structures, laid parallel to each other along the length of the corresponding conductive busbar. The U-shaped bend of each cooling pipe is located at one end of the conductive busbar, and the two straight pipe sections extend along the length of the conductive busbar. The ends of the two straight pipe sections are connected to the first liquid cooling interface (P1).

5. The anti-open-circuit protection device (2) for the steering gear rack quenching sensor as described in claim 3, characterized in that: The spiral coil (23) is located on one side of the stacked structure. The spiral coil (23) is wound with a multi-turn hollow metal tube. The two ends of the spiral coil (23) are respectively connected to a third cooling pipe (27) and a fourth cooling pipe (28). The end of the third cooling pipe (27) away from the spiral coil (23) is electrically connected to the first conductive bus (21). The end of the fourth cooling pipe (28) away from the spiral coil (23) is electrically connected to the second conductive bus (22). The ends of the third cooling pipe (27) and the fourth cooling pipe (28) away from the spiral coil (23) are respectively connected to a second coolant interface (P2).

6. The anti-open-circuit protection device (2) for the steering gear rack quenching sensor as described in claim 5, characterized in that: A first conductive connector (29) is fixedly provided between the third cooling pipe (27) and the first conductive busbar (21), and a second conductive connector (30) is fixedly provided between the fourth cooling pipe (28) and the second conductive busbar (22).

7. The anti-open-circuit protection device (2) for the steering gear rack quenching sensor as described in claim 1, characterized in that: The quenching device (1) further includes a mounting base (13), a first fixed row (14), a second fixed row (15), and a second insulating layer (16). The first fixed row (14) is fixedly mounted on the mounting base (13), with one end electrically connected to the first conductive row (21) and the other end electrically connected to the first electrode (11). The second fixed row (15) is fixedly mounted parallel to the top surface of the first fixed row (14), and the length of the second fixed row (15) is greater than the length of the first fixed row (14). The second insulating layer (16) is disposed between the first fixed row (14) and the second fixed row (15). One end of the second fixed row (15) is electrically connected to the second conductive row (22), and the other end is electrically connected to the second electrode (12).

8. The anti-open-circuit protection device (2) for the steering gear rack quenching sensor as described in claim 7, characterized in that: The first electrode (11) and the second electrode (12) are slidably mounted on the first fixed row (14) and the second fixed row (15), respectively, and the mounting distance between the two electrodes can be changed by sliding adjustment.

9. The anti-open-circuit protection device (2) for the steering gear rack quenching sensor as described in claim 7, characterized in that: The quenching device (1) also includes a water spray box (17), which is disposed between the first electrode (11) and the second electrode (12). The bottom is open and sealed and fixedly connected to the first fixed row (14). The top surface of the water spray box (17) is provided with a plurality of water spray holes (171). The mounting base (13) and the first fixed row (14) are provided with a plurality of cooling water channels (131) spaced apart along the length direction of the water spray box (17). The cooling water channels (131) are connected to the inner cavity of the water spray box (17). The side of the mounting base (13) is provided with a water inlet connector (132) connected to the cooling water channel (131).

10. The anti-open-circuit protection device (2) for the steering gear rack quenching sensor as described in claim 9, characterized in that: A baffle plate (18) is horizontally arranged inside the water spray box (17) along its length direction. The baffle plate (18) divides the inner cavity of the water spray box (17) into an upper cavity (172) and a lower cavity (173) that are interconnected. Water spray holes (171) are evenly distributed on the top surface of the water spray box (17) corresponding to the upper cavity (172). The outlet of the cooling water channel (131) is connected to the lower cavity (173), and the outlet of the cooling water channel (131) is directly opposite the baffle plate (18) in the vertical direction.

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