Frequency modulated quenching apparatus for screwdrivers and method of use

Abstract

The application discloses a frequency-adjusting quenching device of a screwdriver, relates to the technical field of quenching equipment, and aims to solve the problem of low toughness of the corner position of the existing mobile quenching device and easy corner cracking in the prior art, and comprises a quenching box, a frequency-adjusting device, a motor, a conductive circuit, a moving assembly one, an inductor one, an inductor two and a frequency-adjusting module. The application further discloses a use method of the frequency-adjusting quenching device of the screwdriver, which comprises the following steps: S02, fixing a workpiece to be processed by using a three-jaw chuck; S04, starting the moving assembly one to make the workpiece to be processed move in the inductive coil relative to the inductive coil; S06, the inductor one sends a signal one comprising position information of the workpiece to be processed, and the inductor two sends a signal two comprising moving speed information of the workpiece to be processed relative to the inductive coil; S08, a controller receives the signal one and the signal two to adjust a heating frequency; and S10, starting a cooling device to control a flowable medium to cool the workpiece to be processed.

Description

Technical Field

[0001] This invention relates to the field of quenching equipment technology, and in particular to a method of using a frequency-modulated quenching device for screwdrivers. Background Technology

[0002] Heat treatment is a process that alters the external conditions of a metal through heating, holding, and cooling to induce desired changes in its microstructure and chemical composition, thereby improving its properties. Heat treatment causes a series of solid-state transformations in steel, such as atomic diffusion, phase transformation, and changes in the dissolution of solutes in solid solutions. The methods used to induce these transformations include heating, holding, and cooling.

[0003] Cooling methods in metal heat treatment mainly include air cooling and medium cooling. Air cooling involves placing the heated sample in air under specific temperature and humidity conditions for natural cooling. Medium cooling (quenching), on the other hand, involves immersing the sample, heated to the austenitic state, in a cooling medium for rapid cooling, ensuring the cooling rate of the sample exceeds the external cooling rate to obtain martensite. Cooling media are divided into two main categories: one category includes media that undergo physical changes during quenching, such as water, aqueous solutions, and oils; the other category includes media that do not undergo physical changes (or undergo minimal changes) during quenching, such as molten salts and soluble alkalis.

[0004] The quenching of steel aims to impart a martensitic structure, and the challenge lies in controlling the appropriate cooling rate and ensuring uniform cooling. Quenching methods are divided into manual and machine-based methods. Current technology typically employs conventional mobile quenching, where the quenching magnetic lines penetrate from the surface inwards. For quenching at a fixed frequency, the hardened layer of the object is often too deep, resulting in excessive stress and a tendency for edge and corner cracking. Therefore, a new type of mobile quenching device is needed that can reduce the length of the magnetic lines of force on both sides of the quenched workpiece, preventing edge and corner cracking caused by excessive stress at both ends. Summary of the Invention

[0005] The purpose of this application is to provide a new frequency-modulated quenching device and its usage method, which solves the problem that existing mobile quenching devices in the prior art are prone to causing excessive stress at both ends of the workpiece, leading to corner cracking, by using a characteristic heating frequency.

[0006] To achieve the above objectives, the embodiments of this application adopt the following technical solutions:

[0007] A frequency-modulated quenching device for a screwdriver, characterized in that it comprises: a quenching chamber for mounting other components; an induction coil for heating a workpiece passing through the induction coil; a clamping device fixedly disposed inside the quenching chamber, located on the other side of the quenching chamber, for clamping the workpiece and positioning it at the center line of the induction coil; a frequency modulation device including a motor for power supply; a conductive line connected to the induction coil and the motor for transmitting electrical energy; a first moving component disposed on the clamping device and / or the induction coil for moving the workpiece inside the induction coil; and a first sensor. A second sensor is used to sense the position information of the workpiece and send a second signal, the second signal including the position information of the workpiece; a first sensor is used to sense the speed of the workpiece relative to the induction coil and send a first signal, the first signal including the speed information of the workpiece relative to the induction coil; a frequency modulation module is electrically connected to the induction coil, used to receive the first signal, obtain the position information of the induction coil and the workpiece, determine whether the other end of the workpiece is close to the induction coil, if so, adjust the heating frequency of the induction coil to 1 / 2 of the predetermined frequency, if it is determined that the other end of the workpiece is far from the induction coil, increase the heating frequency according to a predetermined ratio. The second signal is received to obtain the speed information of the moved part, and the heating frequency is adjusted according to the speed information according to a predetermined ratio until the predetermined frequency is reached.

[0008] In the above technical solution, the present invention provides a frequency-modulated quenching device for screwdrivers. By adjusting the heating frequency at both ends of the workpiece, the quenching depth is reduced. Compared with the existing mobile quenching device, the width of the quenching magnetic lines at both ends of the workpiece is reduced. This solves the problem that in the existing mobile quenching, the quenching magnetic lines penetrate from the surface to the interior. For a quenching method with a fixed frequency, the hardened layer at both ends of the workpiece is too deep, and the stress is too great, resulting in low toughness and easy cracking at the corners of the workpiece. This achieves the technical effect of improving the toughness of the corners of the product and avoiding cracking.

[0009] Furthermore, in this embodiment of the invention, the frequency modulation quenching device further includes: a cooling device, which is disposed inside the quenching chamber. The cooling device further includes a water return assembly, which includes a water pump and several nozzles. The several nozzles are disposed inside the quenching chamber and are directed toward the workpiece.

[0010] Furthermore, in this embodiment of the invention, the moving component includes an electric telescopic rod, which is fixedly installed at the top of the quenching box. The clamping device includes a connecting plate and a three-jaw chuck. One end of the connecting plate is fixedly disposed at the lower end of the electric telescopic rod. The connecting plate is arranged horizontally. The three-jaw chuck is disposed at the other end of the connecting plate and is used to clamp the workpiece so that the workpiece corresponds to the induction coil.

[0011] Furthermore, in this embodiment of the invention, the fixing of the induction coil includes a fixing plate and a conductive block. The fixing plate is also provided with a slot for installing the conductive block, and the conductive block is used to connect the conductive circuit.

[0012] Furthermore, in this embodiment of the invention, sensor one includes an infrared sensor, which is disposed on the top of the quenching box and faces the clamping device. It is used to detect the distance between the workpiece and the infrared sensor and send signal one, which includes distance information between the workpiece and the infrared sensor.

[0013] Furthermore, in this embodiment of the invention, sensor two includes a speed sensor, which is fixedly mounted on the clamping device and is used to detect the moving speed of the clamping device and send signal two, which includes speed information of the clamping device.

[0014] Furthermore, in this embodiment of the invention, the moving component includes a telescopic motor, which is fixedly installed inside the quenching box at a position relative to the clamping device. An induction coil is fixedly installed on the movable end of the telescopic motor to make the center line of the induction coil correspond to the clamping device.

[0015] Furthermore, in this embodiment of the invention, the quenching box also includes a second moving component, which is disposed at the bottom of the quenching box and is used to move the quenching box.

[0016] Furthermore, in this embodiment of the invention, the moving component includes a telescopic motor, which is fixedly installed inside the quenching box at a position relative to the clamping device. An induction coil is fixedly installed on the movable end of the telescopic motor, and the center line of the induction coil is aligned with the clamping device.

[0017] This application also discloses a method for using a frequency-modulated quenching device for screwdrivers, including the following steps:

[0018] Step S02: Fix the workpiece using a three-jaw chuck;

[0019] Step S04: Activate the moving component one to make the workpiece move relative to the induction coil within the induction coil;

[0020] Step S06: Sensor 1 sends signal 1, which includes the position information of the workpiece, and at the same time, Sensor 2 sends signal 2, which includes the moving speed information of the workpiece relative to the induction coil.

[0021] In step S08, the controller receives signal one and signal two, and determines whether the other end of the workpiece is close to the induction coil according to signal one. If so, the heating frequency of the induction coil is adjusted to 1 / 2 of the predetermined frequency. If the other end of the workpiece is far away from the induction coil, the heating frequency is increased according to the predetermined ratio and the quenching depth is reduced. At the same time, the heating frequency is adjusted according to signal two.

[0022] Step S10: Start the cooling device and control the flowable medium to cool the workpiece.

[0023] Compared with the prior art, the present invention has the following technical effects:

[0024] Sensor 1 detects whether an object is approaching the induction coil and sends signal 1. Sensor 2 detects the speed of the connected placement plate and sends signal 2. Together with sensor 1 and the controller, signal 1 and the pre-set positions of the infrared beam and the induction coil determine whether the workpiece is close to the induction coil. At the same time, sensor 2 sends signal 2 to indicate the relative speed of the workpiece within the induction coil. Together with the sensors, the heating frequency can be adjusted according to the speed, achieving the technical effect of reducing the quenching depth at both ends of the workpiece, ensuring the toughness of both ends of the workpiece and preventing cracking. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of a frequency-modulated quenching device for a screwdriver according to the present invention.

[0026] Figure 2 This is a schematic diagram of a structural embodiment of a frequency-modulated quenching device for a screwdriver according to the present invention.

[0027] Figure 3 This is a schematic diagram of another embodiment of the structure of a frequency-modulated quenching device for a screwdriver.

[0028] Figure 4 This is a schematic diagram comparing the quenching magnetic lines of the frequency-modulated quenching device for a screwdriver according to the present invention with those of the prior art.

[0029] In the attached diagram

[0030] 1. Quenching box 2. Clamping device 3. Workpiece

[0031] 4. Induction coil; 5. Conductive circuit; 101.

[0032] 7. Sensor 1 8. Controller 9. Sensor 2

[0033] 10. Moving component 11. Cooling device 12. Quenching magnetic lines of force

[0034] 101. Moving component 2; 201. Connecting placement plate; 202. Three-jaw chuck.

[0035] 401, Conductive block; 402, Fixing plate; 701, Infrared sensor Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the present invention clear and complete, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of the present invention, and are merely illustrative of the embodiments of the present invention. They are not intended to limit the embodiments of the present invention. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] In the description of this invention, it should be noted that the terms "center," "middle," "upper," "lower," "left," "right," "inner," "outer," "top," "bottom," "side," "vertical," and "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "a," "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0039] For purposes of simplicity and illustration, the principles of the embodiments are described primarily by way of example. In the following description, numerous specific details are set forth to provide a thorough understanding of the embodiments. However, it will be apparent to those skilled in the art that these embodiments may not be limited to these specific details in practice. In some instances, well-known methods and structures have not been described in detail to avoid unnecessarily obscuring these embodiments. Furthermore, all embodiments can be used in combination with each other.

[0040] like Figure 1 , Figure 4 This embodiment provides a frequency-modulated quenching device for screwdrivers. Figure 1 This is a structural block diagram of a frequency-modulated quenching device according to an embodiment of the present invention, as shown below. Figure 1 As shown, the device includes:

[0041] A frequency-modulated quenching device for a screwdriver, characterized in that it comprises: a quenching chamber 1 for mounting other components; an induction coil 4 for heating a workpiece 3 passing through the induction coil 4; a clamping device 2, fixedly disposed inside the quenching chamber 1 on the other side of the quenching chamber 1, for clamping one end of the workpiece 3 and positioning the workpiece 3 at the center line of the induction coil 4; a frequency modulation controller 8, the frequency modulation device including a battery connected to the heating device, the battery for power supply; a conductive line 5 connected to the induction coil 4 for transmitting electrical energy; a moving component 10, the moving component 10 disposed on the clamping device 2 and / or the induction coil 4, for moving the workpiece 3 inside the induction coil 4; and a sensor 7 for sensing the movement of the workpiece 3 driven by the moving component 10. The system includes: a moving part speed sensor 4 and a working part 3 position sensor 9; a frequency modulation module electrically connected to the induction coil 4; a receiving signal 1 to obtain the moving part speed information; adjusting the heating frequency according to the speed information by a predetermined ratio until the predetermined frequency is reached; receiving the second signal to obtain the position information of the induction coil 4 and the working part 3; determining whether the other end of the working part 3 is close to the induction coil 4; if so, adjusting the heating frequency of the induction coil 4 to 1 / 2 of the predetermined frequency; if the other end of the working part 3 is far away from the induction coil 4, increasing the heating frequency by a predetermined ratio.

[0042] Through the above-mentioned device, the workpiece 3 is clamped by the clamping device 2 and moved automatically within the induction coil 4 by the moving component 10. This achieves the technical effect of facilitating worker operation, saving working time, and improving work efficiency while ensuring the quenching effect. Then, the frequency modulation module obtains the position and moving speed of the workpiece 3 and the induction coil 4 and adjusts the heating frequency. By adjusting the heating frequency at both ends of the workpiece 3, the quenching depth is reduced. Compared with the existing mobile quenching device, the width of the quenching magnetic lines at both ends of the workpiece 3 is reduced. This solves the problem that in the existing mobile quenching, the quenching magnetic lines penetrate from the surface to the inside. For a quenching method with a fixed frequency, the hardened layer at both ends of the workpiece 3 is too deep, and the stress is too great, resulting in low toughness and easy cracking at the corners of the workpiece 3. This achieves the technical effect of improving the toughness of the corners of the product and avoiding cracking.

[0043] The heating frequency of the induction coil 4 can be adjusted by obtaining the moving speed of the workpiece 3 and the position of the workpiece 3 relative to the induction coil 4 through the frequency modulation module. Whether this can reduce the quenching depth of the workpiece 3 can be determined according to actual needs. In other words, there are many ways to adjust the heating frequency of the induction coil 4 by obtaining the position and moving speed of the workpiece 3. Regardless of the method used, as long as the quenching depth at both ends of the workpiece 3 can be reduced by adjusting the heating frequency, the problem of low toughness and easy cracking at the corners of commonly used mobile quenching devices can be solved.

[0044] There are many ways to adjust the heating frequency to reduce the quenching depth at both ends of the workpiece 3. In this embodiment, two optional implementation methods are provided.

[0045] Example 1:

[0046] like Figure 2 As shown, in this embodiment, the device for adjusting the heating frequency to reduce the quenching depth at both ends of the workpiece 3 includes:

[0047] The components include: a quenching chamber 1 for mounting other components; an induction coil 4 for heating the workpiece 3 passing through the induction coil 4; a clamping device 2 fixedly disposed inside the quenching chamber 1 on the other side, used to clamp one end of the workpiece 3 and position it at the center line of the induction coil 4; a frequency modulation controller 8, including a motor 6 for power supply; a conductive line 5 connected to the induction coil 4 for transmitting electrical energy; a moving assembly 10 disposed on the clamping device 2 and / or the induction coil 4 for moving the workpiece 3 inside the induction coil 4; and a sensor 7 for sensing the speed of the workpiece 3 relative to the induction coil 4 and sending a signal. The system includes: a speed information of the moved part; a second sensor 9, which senses the position information of the workpiece 3 and sends a second signal, which includes the position information of the induction coil 4 and the workpiece 3; a frequency modulation module, which is electrically connected to the induction coil 4, for receiving the first signal, acquiring the speed information of the moved part, adjusting the heating frequency according to the speed information in a predetermined proportion until the predetermined frequency is reached; receiving the second signal, acquiring the position information of the induction coil 4 and the workpiece 3, determining whether the other end of the workpiece 3 is close to the induction coil 4, if so, adjusting the heating frequency of the induction coil 4 to 1 / 2 of the predetermined frequency, if it is determined that the other end of the workpiece 3 is far away from the induction coil 4, increasing the heating frequency in a predetermined proportion and decreasing the quenching depth.

[0048] Specifically, in this embodiment, the frequency-modulated quenching device further includes a cooling device 11, which is installed inside the quenching chamber 1 and is used to control the flowable medium to cool the workpiece 3. The cooling device 11 also includes a water return assembly, which includes a water pump and several nozzles. The several nozzles are installed inside the quenching chamber 1 and face the workpiece 3. They are used to cooperate with the heating device to complete the quenching of the workpiece 3 and ensure hardenability.

[0049] Specifically, the moving component 10 includes an electric telescopic rod, which is fixedly installed at the top of the quenching box 1. The clamping device 2 includes a connecting placement plate 201 and a three-jaw chuck 202. One end of the connecting placement plate 201 is fixedly installed at the lower end of the electric telescopic rod, so that the connecting placement plate 201 is arranged horizontally. The three-jaw chuck 202 is installed at the other end of the connecting placement plate 201 for clamping the workpiece 3, so that the workpiece 3 corresponds to the induction coil 4.

[0050] Specifically, the fixing of the induction coil 4 includes a fixing plate 402 and a conductive block 401. The fixing plate 402 includes a slot 1, which is located at one end of the fixing plate 402 for installing a conductive line 5. The conductive line 5 is connected to the motor 6 to provide electrical energy.

[0051] Specifically, sensor 7 includes an infrared sensor 701, which is located on the top of the quenching chamber 1, facing the three-jaw chuck 202, for detecting the distance between the workpiece 3 and the infrared sensor 701, and sending a signal 1, which includes distance information between the workpiece 3 and the infrared sensor 701.

[0052] Specifically, sensor 29 includes a speed sensor. This sensor 29 is low-power, highly sensitive, and easy to install. The speed sensor is fixedly mounted on the connecting plate 201 to detect the speed of the connecting plate 201 and send signal 2. This signal 2 includes the speed information of the connecting plate 201. In conjunction with sensor 17 and controller 8, the sensor 29 determines whether the workpiece 3 is close to the induction coil 4 by using signal 1 and the pre-set positions of the infrared and induction coil 4. This prevents processing errors caused by improper placement of the workpiece 3. At the same time, sensor 29 sends the relative motion speed of the workpiece 3 within the induction coil 4 through signal 2. In conjunction with the sensor, the heating frequency can be adjusted according to the speed. This satisfies the technical effect of adjusting the heating frequency to reduce the quenching depth at both ends of the workpiece 3, ensuring the toughness of both ends of the workpiece 3 and preventing cracking.

[0053] Specifically, the quenching box 1 is also equipped with a box door, which has an observation window made of high-temperature resistant glass, for observing the quenching process and ensuring the safety of quenching.

[0054] Specifically, a moving component 101 is provided under the quenching box 1, including directional wheels and / or universal wheels, for moving the quenching box 1.

[0055] Example 2:

[0056] like Figure 3 In this embodiment, there are various devices that can satisfy the above-mentioned adjustment of heating frequency to reduce the quenching depth at both ends of the workpiece 3. Here, another device is provided, which has: a clamping device 2 is fixedly disposed on the left side of the quenching box 1. The clamping device 2 includes a three-jaw chuck 202 for fixing the workpiece 3.

[0057] Specifically, the moving component 10 includes a telescopic motor 6, which is fixedly installed inside the quenching chamber 1 at a position relative to the clamping device 2. The movable end of the telescopic motor 6 is fixedly mounted with an induction coil 4, and the center line of the induction coil 4 is aligned with the clamping device 2, so that the workpiece 3 moves relative to the induction coil 4 within the induction coil 4. The telescopic motor 6 is connected to the controller 8 to drive the induction coil 4 to reciprocate, and the speed and distance of the reciprocating motion can be set in advance to ensure the quenching effect.

[0058] Specifically, sensor 7 includes an infrared sensor 701, which is located on the movable end of the telescopic motor 6, on the side close to the induction coil 4. It is used to detect whether an object is approaching the induction coil 4 and send a signal 1, including information on whether an object is approaching the induction coil 4, thereby achieving the effect of detecting whether the workpiece 3 is close to the induction coil 4.

[0059] Specifically, sensor 2 9 includes a speed sensor, which is set on the moving end of the telescopic motor 6 to detect the speed of the moving end of the telescopic motor 6. This achieves the effect of detecting the induction coil 4 set on the moving end of the telescopic motor 6. In conjunction with sensor 1 7 and controller 8, it can achieve the effect of adjusting the heating frequency according to the speed, thereby satisfying the technical effect of adjusting the heating frequency to reduce the quenching depth at both ends of the workpiece 3, ensuring the toughness of both ends of the workpiece 3 and avoiding cracking.

[0060] The remaining devices and their effects in this embodiment are the same as in Embodiment 1.

[0061] Example 3:

[0062] In this embodiment, a method for detecting the straightness of a connecting rod is also provided, including the following steps:

[0063] Step S02: Fix the workpiece 3 to be processed using a three-jaw chuck 202, for example, by screwing or fixing the nut onto the three-jaw chuck 202;

[0064] Step S04: Start the moving component 10 to make the workpiece 3 move relative to the induction coil 4 within the induction coil 4. For example, in Embodiment 1, the moving component 10 includes a telescopic motor 6 that drives the clamping device 2 to make the workpiece 3 reciprocate within the induction coil 4.

[0065] In step S06, sensor 1 7 sends signal 1, which includes the position information of the workpiece 3, and at the same time sensor 2 9 sends signal 2, which includes the moving speed information of the workpiece 3 relative to the induction coil 4.

[0066] In step S08, the controller 8 receives signal one and signal two, and determines whether the other end of the workpiece 3 is close to the induction coil 4 according to signal one. If so, the heating frequency of the induction coil 4 is adjusted to 1 / 2 of the predetermined frequency. If it is determined that the other end of the workpiece 3 is far away from the induction coil 4, the heating frequency is increased according to the predetermined ratio to reduce the quenching depth. At the same time, the heating frequency is adjusted according to signal two to achieve the technical effect of adjusting the heating frequency to reduce the quenching depth at both ends of the workpiece 3, ensuring the toughness of both ends of the workpiece 3 and avoiding cracking.

[0067] Step S10: Start the cooling device 11 to control the flowable medium to cool the workpiece 3, and cooperate with the heating device to complete the quenching of the workpiece 3 to ensure hardenability.

[0068] Although the illustrative specific embodiments of this application have been described above to enable those skilled in the art to understand this application, this application is not limited to the scope of the specific embodiments. For those skilled in the art, all applications utilizing the concept of this application are protected as long as various variations are within the spirit and scope of this application as defined and determined by the appended claims.

Claims

1. A frequency modulated quenching device for a screwdriver, characterized in that, The quenching device comprises: a quenching box for mounting other components; an induction coil for heating a workpiece passing through the induction coil; a clamping device fixedly arranged inside the quenching box and located on the other side of the quenching box for clamping the workpiece and positioning the workpiece at the center line position of the induction coil; a frequency modulation device comprising a motor for power supply; a conductive circuit connected with the induction coil and the motor for transmitting electric energy; a moving assembly one arranged on the clamping device and / or the induction coil for moving the workpiece inside the induction coil; an inductor one for sensing the position information of the workpiece and sending a signal one comprising the position information of the workpiece; an inductor two for sensing the speed of the workpiece relative to the induction coil and sending a signal two comprising the speed information of the workpiece relative to the induction coil; a frequency modulation module electrically connected with the induction coil for receiving the signal one, obtaining the position information of the induction coil and the workpiece, judging whether the other end of the workpiece is close to the induction coil, if yes, adjusting the heating frequency of the induction coil to 1 / 2 of the predetermined frequency, if judging that the other end of the workpiece is away from the induction coil, increasing the heating frequency by a predetermined proportion; receiving the signal two, obtaining the speed information of the moving part, and adjusting the heating frequency according to the speed information by a predetermined proportion until the predetermined frequency is reached.

2. A frequency modulated quenching device for a screwdriver according to claim 1, characterized in that The quenching device further comprises a cooling device arranged in the quenching box, the cooling device further comprises a water return assembly comprising a water pump and a plurality of nozzles arranged inside the quenching box, the plurality of nozzles are directed towards the position of the workpiece.

3. The frequency modulated quenching device for screwdrivers according to claim 1, characterized in that, The moving assembly one comprises an electric telescopic rod fixedly mounted at the top end of the quenching box, the clamping device comprises a connecting placement plate and a three-jaw chuck, one end of the connecting placement plate is fixedly arranged at the lower end of the electric telescopic rod, the connecting placement plate is horizontally arranged, the three-jaw chuck is arranged at the other end of the connecting placement plate for clamping the workpiece so that the workpiece corresponds to the induction coil.

4. The frequency modulated quenching device for screwdrivers according to claim 1, characterized in that, The fixation of the induction coil comprises a fixed plate and a conductive block, the fixed plate is further provided with a notch one for mounting the conductive block, the conductive block is used for connecting the conductive circuit.

5. The frequency modulated quenching device for screwdrivers according to claim 1, characterized in that, The inductor one comprises an infrared inductor arranged at the top of the quenching box and directed towards the clamping device for detecting the distance between the workpiece and the infrared inductor and sending the signal one comprising the distance information of the distance between the workpiece and the infrared inductor.

6. The frequency modulated quenching device for screwdrivers according to claim 1, characterized in that, The inductor two comprises a speed sensor fixedly arranged on the clamping device for detecting the moving speed of the clamping device and sending the signal two comprising the speed information of the clamping device.

7. The frequency modulated quenching device for screwdrivers according to claim 1, characterized in that, The moving assembly one includes a telescopic motor, which is fixedly arranged in the quenching box and located at the opposite position of the clamping device, and the movable end of the telescopic motor is fixedly installed with the induction coil, so as to make the center line position of the induction coil correspond to the clamping device.

8. The frequency modulated quenching device for screwdrivers according to claim 1, characterized in that, The quenching box further includes a moving assembly two, which is arranged at the bottom of the quenching box and used to drive the quenching box to move.

9. The frequency modulated quenching device for screwdrivers according to claim 1, characterized in that, The moving assembly one includes a telescopic motor, which is fixedly arranged in the quenching box and located at the opposite position of the clamping device, and the movable end of the telescopic motor is fixedly installed with the induction coil, so as to make the center line position of the induction coil correspond to the clamping device.

10. A method of using a frequency modulated quenching device of a screwdriver, applied to the frequency modulated quenching device of any one of claims 1 to 9, characterized in that, The method comprises the following steps: S02, fixing the workpiece by using a three-jaw chuck; S04, starting the moving assembly one to make the workpiece move relative to the induction coil; S06, the inductor one sends the signal one including the position information of the workpiece, and the inductor two sends the signal two including the moving speed information of the workpiece relative to the induction coil; S08, the controller receives the signal one and the signal two, judges whether the other end of the workpiece is close to the induction coil according to the signal one, adjusts the heating frequency of the induction coil to 1 / 2 of the predetermined frequency if yes, increases the heating frequency according to a predetermined proportion and reduces the quenching depth if the other end of the workpiece is away from the induction coil, and adjusts the heating frequency according to the signal two; S10, starting the cooling device to control the flowable medium to cool the workpiece.

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