Motor shaft blind hole quenching device

Abstract

The utility model relates to the technical field of motor shaft quenching, and provides a motor shaft blind hole quenching device which comprises a fixing frame, a quenching liquid pipe and a heating ring, and the quenching liquid pipe comprises an insertion pipe and two first water inlet pipes; one end of each of the two first water inlet pipes is communicated with the bottom end of the insertion pipe in a sealing manner; the heating ring is fixed to the top end of the insertion pipe in a sealed mode, and the heating ring and the insertion pipe are both arranged in a blind hole of a motor shaft. The two first water inlet pipes are arranged, the pressure of cooling liquid sprayed out of the first water outlet holes can be adjusted through on-off control of the two first water inlet pipes and water supply equipment, and when the heating ring moves in the blind hole and heats the blind hole, the cooling liquid with small pressure is used for quenching the inner wall of the blind hole located below the heating ring; and when the heating ring moves to the root part of the blind hole and finishes heating, the root part of the blind hole is quenched by using high-pressure cooling liquid, so that the quenching quality of the quenching device is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of motor shaft quenching, in particular to a blind hole quenching device for a motor shaft. Background Art

[0002] Quenching is an important process in the processing of motor shafts. After heating the motor shaft to a certain temperature, rapid cooling is carried out with a coolant (oil, water, air, etc.), which can significantly improve the hardness and strength of the motor shaft.

[0003] The utility model with the publication number CN220183336U discloses a high-frequency quenching device for internal splines in blind holes, which has high high-frequency quenching quality, uniform hardness in the blind hole and no cracking phenomenon. The technical solution adopted is as follows: The three-jaw chuck clamping device for clamping the upper end of the workpiece is fixedly installed above the workbench. A rotating mechanism for driving the workpiece to rotate is installed on the three-jaw chuck clamping device. The quenching lifting device is fixedly installed on the workbench. A power supply system is installed inside the quenching lifting device. The scanning internal spline induction coil is a non-closed circular ring structure. The free ends of the cross bars of the two L-shaped conductive tubes are fixed at the upper end of the quenching lifting device and connected to the power supply system. The free ends of the vertical bars of the two L-shaped conductive tubes face vertically upward and are connected to both ends of the scanning internal spline induction coil. The scanning internal spline induction coil is correspondingly located directly below the three-jaw chuck clamping device.

[0004] In the above technical solution, in order to improve the quenching quality of the workpiece, the blind hole is set downward to avoid water accumulation in the blind hole. However, the induction coil will occupy a certain longitudinal space, making the liquid spray hole unable to move to the root position inside the blind hole, and the cooling medium cannot be sprayed on the root position of the blind hole, and spray quenching at the root of the blind hole cannot be achieved. Summary of the Utility Model

[0005] In view of this, the utility model provides a blind hole quenching device for a motor shaft, which can spray the coolant at different positions inside the blind hole to ensure the quenching quality of the motor shaft.

[0006] The technical solution of the utility model is realized as follows: The utility model provides a blind hole quenching device for a motor shaft, including a fixing frame, a quenching liquid pipe and a heating coil. Among them,

[0007] The quenching liquid pipe includes an inserting pipe and two first water inlet pipes. The inserting pipe is fixedly arranged on the fixing frame and is arranged in the vertical direction. First water outlet holes are opened on the circumferential side of its top end. One ends of the two first water inlet pipes are hermetically communicated with the bottom end of the inserting pipe, and the other ends are both communicated with a water supply device through pipelines and electromagnetic control valves.

[0008] The heating coil is hermetically fixed at the top end of the inserting pipe, and both it and the inserting pipe are arranged inside the blind hole of the motor shaft.

[0009] Based on the above technical solutions, preferably, it further includes a cooling disc, and the cooling disc includes a collar and a second water inlet pipe. Among them,

[0010] The collar is fixedly arranged on the fixed frame and sleeved outside the motor shaft. It is a hollow circular ring structure, and second water outlet holes are provided on its inner wall;

[0011] One end of the second water inlet pipe is fixedly sealed on the collar, and the other end is connected to a water supply device through a pipeline and an electromagnetic control valve, and the inside of the second water inlet pipe is communicated with the second water outlet holes.

[0012] More preferably, the cooling disc further includes a screw rod and a nut. Among them,

[0013] One end of the screw rod is fixedly arranged on the collar, and the other end passes through and is slidably arranged on the fixed frame;

[0014] The nut is connected to the screw rod by thread fit. Two nuts are arranged on each screw rod, and the two nuts on the same screw rod respectively abut against both sides of the fixed frame.

[0015] More preferably, there are two second water inlet pipes, and the two second water inlet pipes and the two first water inlet pipes are symmetrically arranged about the center line of the insertion tube.

[0016] Based on the above technical solutions, preferably, the insertion tube includes a central tube and a top cover. Among them,

[0017] The central tube passes through and is detachably fixed on the fixed frame;

[0018] The top cover is a circular cover structure with an opening at the lower end. The lower end of the top cover is sleeved outside the upper end of the central tube and is fixedly sealed with it. The first water outlet holes are provided on the circumferential side of the top cover.

[0019] More preferably, the heating coil includes two magnetic conductors, screws and coils. Among them,

[0020] The two magnetic conductors are arranged in abutting contact along the axial direction of the insertion tube. Card slots are provided on the circumferential sides of the magnetic conductors, and the two card slots are communicated;

[0021] The screw passes through the two magnetic conductors. One end of it is detachably fixedly connected to the top side of the top cover, and the other end abuts against the top side of the upper magnetic conductor;

[0022] The coil is arranged in the card slot, and its two ends respectively abut against the two magnetic conductors.

[0023] Based on the above technical solutions, preferably, the fixing frame includes a mounting frame and a support frame. The insertion tube passes through and is detachably fixed on the support frame. An installation groove is formed on the circumferential side of the support frame, and the installation groove penetrates to the top side and the bottom side of the support frame respectively. And a part of the mounting frame is detachably fixed in the installation groove.

[0024] More preferably, the mounting frame includes two mounting plates and a connecting plate. Among them,

[0025] The two mounting plates are arranged at intervals;

[0026] One end of the connecting plate is fixedly arranged between the two mounting plates, and the other end is fixedly connected to the heating coil. And a part of the connecting plate is detachably fixed in the installation groove.

[0027] More preferably, the mounting frame further includes a reinforcing rod and a reinforcing plate. Among them,

[0028] The reinforcing rods are respectively fixedly arranged on both sides of the connecting plate, and both ends thereof are respectively clamped with the mounting plate and the heating coil;

[0029] The reinforcing plates are respectively fixedly arranged on both sides of the connecting plate. There are two reinforcing plates on each side of the connecting plate. And the two reinforcing plates located on the same side of the connecting plate are respectively abutted against the top side and the bottom side of the reinforcing rod. The two reinforcing plates located below are detachably fixedly connected to the support frame.

[0030] More preferably, a plurality of first water outlet holes and a plurality of second water outlet holes are provided, and the plurality of first water outlet holes and the plurality of second water outlet holes are both arranged in a circumferential array around the center line of the insertion tube.

[0031] A motor shaft blind hole quenching device of the present utility model has the following beneficial effects compared with the prior art:

[0032] (1) By providing two first water inlet pipes and controlling the on-off connection with the water supply device, the pressure of the coolant sprayed out of the first water outlet holes can be adjusted. When the heating coil moves in the blind hole and conducts heating, the inner wall of the blind hole below the heating coil is quenched with coolant at a small pressure. And when the heating coil moves to the root of the blind hole and ends heating, the root of the blind hole is quenched with coolant at a large pressure, thereby ensuring the quenching quality of the present quenching device;

[0033] (2) By providing the mounting plate, the connecting plate and the support frame, and fixedly connecting the connecting plate to the heating coil, it is convenient to replace the quenching liquid pipe, thereby improving the maintenance convenience of the present quenching device;

[0034] (3) By setting the reinforcing rods and reinforcing plates, the connection firmness between the fixing frame and other components can be improved. By setting two mounting plates, the mounting adaptability of the fixing frame can be increased, thereby enhancing the fixing firmness of this quenching device. Description of the Drawings

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0036] Figure 1 Stereogram of a motor shaft blind hole quenching device of the present invention;

[0037] Figure 2 Cross-sectional view at the heating coil of a motor shaft blind hole quenching device of the present invention;

[0038] Figure 3 Stereogram at the mounting frame of a motor shaft blind hole quenching device of the present invention;

[0039] Figure 4 Stereogram at the support frame of a motor shaft blind hole quenching device of the present invention;

[0040] Figure 5 Stereogram of the fixing frame of a motor shaft blind hole quenching device of the present invention.

[0041] Wherein: 1, fixing frame; 11, mounting frame; 111, mounting plate; 112, connecting plate; 113, reinforcing rod; 114, reinforcing plate; 12, support frame; 101, mounting groove; 2, quenching liquid pipe; 21, insertion pipe; 211, central pipe; 212, top cover; 22, first water inlet pipe; 201, first water outlet hole; 3, heating coil; 31, magnetic conductor; 32, screw; 33, coil; 301, card slot; 4, cooling disk; 41, collar; 42, second water inlet pipe; 43, screw rod; 44, nut; 401, second water outlet hole; 5, motor shaft; 501, blind hole. Detailed Embodiments

[0042] The following will clearly and completely describe the technical solutions in the present invention in conjunction with the specific embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0043] The motor shaft is the motor shaft 5, and a blind hole 501 is provided at one end thereof. The inside of the blind hole 501 is in a spline shape. As Figure 2 shown, the lower end inside the blind hole 501 is the mouth of the blind hole 501, and the upper end inside the blind hole 501 is the root of the blind hole 501. When quenching the motor shaft 5, with the mouth of the blind hole 501 facing downwards, the problem of the cooling medium accumulating inside the blind hole 501 can be avoided, thereby improving the quenching quality of the motor shaft 5.

[0044] As Figures 1 - 5 shown, a blind hole quenching device for a motor shaft of the present utility model includes a fixing frame 1, a quenching liquid pipe 2, a heating coil 3 and a cooling disk 4, which are used for quenching the motor shaft 5.

[0045] Among them, the fixing frame 1 is used for carrying other components.

[0046] The quenching liquid pipe 2 is used for quenching the inside of the blind hole 501. The quenching liquid pipe 2 includes an insertion pipe 21 and two first water inlet pipes 22. The insertion pipe 21 is fixedly arranged on the fixing frame 1 and is arranged in the vertical direction. A first water outlet hole 201 is provided on the circumferential side of its top end; one ends of the two first water inlet pipes 22 are hermetically communicated with the bottom end of the insertion pipe 21. As Figure 1 shown, the two first water inlet pipes 22 and the insertion pipe 21 are preferably connected through a tee. The inside of the first water inlet pipe 22 is communicated with the first water outlet hole 201. The other ends of the two first water inlet pipes 22 are both communicated with a water supply device through a pipeline and an electromagnetic control valve, and can be controlled to be turned on and off according to actual needs, and it is possible to select to conduct one first water inlet pipe 22 with the water supply device or both first water inlet pipes 22 with the water supply device or both first water inlet pipes 22 not with the water supply device. Among them, the water supply device is used for providing a coolant.

[0047] The heating coil 3 is used for heating the motor shaft 5. The heating coil 3 is hermetically fixed at the top end of the insertion pipe 21, and it and the insertion pipe 21 are both arranged inside the blind hole 501 of the motor shaft 5. After the heating coil 3 heats the motor shaft 5 to a specified temperature, the first water inlet pipe 22 is conducted with the water supply device, so that the coolant in the water supply device enters the insertion pipe 21 through the first water inlet pipe 22, and then is sprayed out from the first water outlet hole 201 onto the inner wall of the blind hole 501, thereby quenching the inner wall of the blind hole 501.

[0048] When quenching the inner wall of the blind hole 501, first fix the top end of the motor shaft 5 on the rotating chuck, then insert the heating coil 3 and the quenching liquid pipe 2 into the blind hole 501. Next, drive the heating coil 3 to move up and down by moving the quenching device up and down, so as to heat the inner wall of the blind hole 501. After the inner wall of the blind hole 501 is heated to the specified temperature, drive the quenching liquid pipe 2 to move by moving the quenching device, so that the cooling liquid sprayed from the first water outlet hole 201 sprays on the inner wall of the blind hole 501. During this period, since the heating coil 3 is arranged above the first water outlet hole 201, the first water outlet hole 201 cannot move up to the root position of the blind hole 501. If you want the cooling liquid to contact the root position of the blind hole 501, it is necessary to increase the spraying pressure of the cooling liquid so that the cooling liquid splashes to the root position of the blind hole 501. Based on this principle, two first water inlet pipes 22 are provided in this quenching device. When the heating coil 3 is inserted into the mouth of the blind hole 501 and moves up to heat the inner wall of the blind hole 501, make one of the first water inlet pipes 22 communicate with the water supply device. At this time, the spraying pressure of the cooling liquid is small, and the cooling liquid is sprayed on the inner wall of the blind hole 501 below the heating coil 3 to perform quenching while heating the inner wall of the blind hole 501. When the heating coil 3 moves to the root of the blind hole 501 and stops heating, make both first water inlet pipes 22 communicate with the water supply device, so as to increase the pressure of the cooling liquid sprayed from the first water outlet hole 201, so that the cooling liquid can splash to the root position in the blind hole 501, thus ensuring the quenching quality. Specifically, in order to make the cooling liquid better spray to the root of the blind hole 501, it is preferably to set the first water outlet hole 201 to be inclined, so that the end close to the center line of the insertion pipe 21 is lower than the end far from the center line of the insertion pipe 21.

[0049] The cooling disc 4 is used for quenching the outer wall of the motor shaft 5. The cooling disc 4 includes a collar 41, a second water inlet pipe 42, a screw 43 and a nut 44. The collar 41 is fixedly arranged on the fixed frame 1 and sleeved outside the motor shaft 5. It is a hollow circular ring structure, and a second water outlet hole 401 is opened on its inner wall. One end of the second water inlet pipe 42 is fixedly sealed on the collar 41, and the other end is connected to the water supply device through a pipeline and an electromagnetic control valve, and the inside of the second water inlet pipe 42 is connected to the second water outlet hole 401. After the heating coil 3 heats the motor shaft 5 to the specified temperature, the cooling liquid in the water supply device enters the collar 41 through the second water inlet pipe 42, and then is sprayed from the second water outlet hole 401 to the outside of the motor shaft 5, so as to quench the outside of the motor shaft 5.

[0050] One end of the screw rod 43 is fixedly arranged on the collar 41, and the other end penetrates through and is slidably arranged on the fixing frame 1; the nut 44 is connected to the screw rod 43 through thread fit. There are two nuts 44 arranged on each screw rod 43, and the two nuts 44 on the same screw rod 43 respectively abut against both sides of the fixing frame 1, so as to fix the collar 41 on the fixing frame 1; at the same time, by rotating the two nuts 44, the screw rod 43 can be axially moved, so as to adjust the relative positions of the collar 41 and the fixing frame 1 and the relative positions of the collar 41 and the heating coil 3. Among them, it is preferably that the collar 41 and the heating coil 3 are at the same height.

[0051] There may also be two second water inlet pipes 42, and the two second water inlet pipes 42 and the two first water inlet pipes 22 are symmetrically arranged about the center line of the insertion pipe 21, so as to improve the balance of the quenching device.

[0052] As Figure 2 shown, a plurality of first water outlet holes 201 and second water outlet holes 401 are provided, and the plurality of first water outlet holes 201 and the plurality of second water outlet holes 401 are arranged in a circumferential array around the center line of the insertion pipe 21, so as to improve the quenching efficiency and the uniformity and stability of the quenching operation of the quenching device.

[0053] As Figure 2 shown, the insertion pipe 21 includes a central pipe 211 and a top cover 212. The central pipe 211 penetrates through and is detachably fixed on the fixing frame 1; the top cover 212 is a circular cover-shaped structure with an opening at the lower end. The lower end of the top cover 212 is sleeved on the outside of the upper end of the central pipe 211 and is fixedly sealed with it. The first water outlet holes 201 are opened on the circumferential side of the top cover 212. By using the top cover 212 to block the end of the central pipe 211, the sealing performance between the top end of the insertion pipe 21 and the heating coil 3 is improved.

[0054] The heating coil 3 includes two magnetic conductors 31, screws 32 and a coil 33. The two magnetic conductors 31 are arranged in abutment along the axial direction of the insertion pipe 21. A card slot 301 is opened on the circumferential side of the magnetic conductor 31, and the two card slots 301 are communicated; the screw 32 penetrates through the two magnetic conductors 31, one end of which is detachably fixedly connected to the top side of the top cover 212, preferably through thread fit, and the other end abuts against the top side of the upper magnetic conductor 31, so as to fix the two magnetic conductors 31 on the top side of the top cover 212; the coil 33 is arranged in the card slot 301, and its two ends respectively abut against the two magnetic conductors 31, so as to improve the fixing firmness and disassembly convenience of the coil 33; by applying high-frequency alternating current to generate a changing magnetic field, eddy currents are generated in the magnetic conductor 31, and these eddy currents generate Joule heat due to resistance, so as to heat the motor shaft 5. This is the prior art.

[0055] The fixing bracket 1 includes a mounting bracket 11 and a support bracket 12. The mounting bracket 11 is used to connect with the output end of a lifting device (such as a lifting hydraulic cylinder) to drive the quenching device up and down. The inserting pipe 21 penetrates through and is detachably fixed on the support bracket 12. An installation groove 101 is formed on the circumferential side of the support bracket 12, and the installation groove 101 penetrates through to the top side and the bottom side of the support bracket 12 respectively. And a part of the mounting bracket 11 is detachably fixed in the installation groove 101. The through design of the installation groove 101 can prevent the coolant from accumulating in the installation groove 101.

[0056] The mounting bracket 11 includes two mounting plates 111, a connecting plate 112, a reinforcing rod 113 and a reinforcing plate 114. The two mounting plates 111 are arranged at intervals, and their arrangement mode corresponds to the side wall of the output end of the lifting device. The two mounting plates 111 can be arranged on the same plane to mount the mounting plates 111 on the plane side wall, or the two mounting plates 111 can be arranged at a certain angle to be mounted on the arc-shaped side wall, increasing the contact area between the mounting plates 111 and the output end of the lifting device and improving the fixing firmness between the mounting plates 111 and the output end of the lifting device. One end of the connecting plate 112 is fixedly arranged between the two mounting plates 111, and the other end is fixedly connected with the heating coil 3. And a part of the connecting plate 112 is detachably fixed in the installation groove 101. The connecting plate 112 is also fixedly connected with the heating coil 3, so that the quenching liquid pipe 2 can be detached from the quenching device alone without affecting the fixing position of the heating coil 3, thereby improving the maintenance convenience of the quenching device.

[0057] The reinforcing rods 113 are respectively fixedly arranged on both sides of the connecting plate 112, and their two ends are respectively clamped with the mounting plate 111 and the heating coil 3 to improve the bending resistance of the connecting plate 112 and enhance its structural strength. The reinforcing plates 114 are respectively fixedly arranged on both sides of the connecting plate 112. There are two reinforcing plates 114 on each side of the connecting plate 112, and the two reinforcing plates 114 located on the same side of the connecting plate 112 respectively abut against the top side and the bottom side of the same reinforcing rod 113, thereby also improving the bending resistance of the reinforcing rod 113. The two reinforcing plates 114 located below are detachably fixedly connected with the support bracket 12.

[0058] The using method of a motor shaft blind hole quenching device of the present utility model is as follows:

[0059] First, fix the motor shaft 5 on the rotating jaw with the blind hole 501 facing downwards, fix the fixing frame 1 on the output end of the lifting device, then move the heating coil 3 to directly below the blind hole 501, and control the rotation of the rotating jaw. Then, energize and heat the heating coil 3, and use the lifting device to drive the heating coil 3 to insert into the blind hole 501 and move upwards within the blind hole 501 to heat the motor shaft 5. Finally, connect the first water inlet pipe 22 and the second water inlet pipe 42 to the water supply device, and let the coolant spray on the outer wall of the motor shaft 5 and the inner wall of the blind hole 501 to perform the quenching operation on the motor shaft 5. During this period, when the first water outlet hole 201 moves below the root position of the blind hole 501, only one of the first water inlet pipes 22 is connected to the water supply device to keep the coolant at a relatively low pressure for quenching the motor shaft 5 at the lower side of the heating coil 3. When the first water outlet hole 201 moves to the root position of the blind hole 501, both first water inlet pipes 22 are connected to the water supply device to increase the water pressure so that the coolant can spray on the root of the blind hole 501, thus realizing the quenching of the root of the blind hole 501.

[0060] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A quenching device for a blind hole of a motor shaft, characterized in that: It includes a fixing frame (1), a quenching liquid pipe (2) and a heating coil (3). Among them, the quenching liquid pipe (2) includes an insertion pipe (21) and two first water inlet pipes (22). The insertion pipe (21) is fixedly arranged on the fixing frame (1) and is arranged in the vertical direction. A first water outlet hole (201) is opened on the circumferential side of its top end; one ends of the two first water inlet pipes (22) are hermetically communicated with the bottom end of the insertion pipe (21), and the other ends are communicated with a water supply device through pipes and electromagnetic control valves; the heating coil (3) is hermetically fixed at the top end of the insertion pipe (21), and both it and the insertion pipe (21) are arranged in the blind hole (501) of the motor shaft (5).

2. The blind hole quenching device for a motor shaft according to claim 1, characterized in that: It further includes a cooling disc (4). The cooling disc (4) includes a collar (41) and a second water inlet pipe (42). Among them, the collar (41) is fixedly arranged on the fixing frame (1) and is sleeved outside the motor shaft (5). It is a hollow circular ring structure, and a second water outlet hole (401) is opened on its inner wall; one end of the second water inlet pipe (42) is hermetically fixed on the collar (41), the other end is communicated with a water supply device through pipes and electromagnetic control valves, and the inside of the second water inlet pipe (42) is communicated with the second water outlet hole (401).

3. The blind hole quenching device for a motor shaft according to claim 2, characterized in that: The cooling disc (4) further includes a screw (43) and a nut (44). Among them, one end of the screw (43) is fixedly arranged on the collar (41), and the other end passes through and is slidably arranged on the fixing frame (1); the nut (44) is connected to the screw (43) by thread fit. Two nuts (44) are arranged on each screw (43), and the two nuts (44) on the same screw (43) respectively abut against both sides of the fixing frame (1).

4. The motor shaft blind hole quenching device according to claim 3, characterized in that: There are two second water inlet pipes (42). The two second water inlet pipes (42) and the two first water inlet pipes (22) are symmetrically arranged about the central axis of the insertion pipe (21).

5. A quenching device for a blind hole of a motor shaft according to claim 1, characterized in that: The insertion pipe (21) includes a central pipe (211) and a top cover (212). Among them, the central pipe (211) passes through and is detachably fixed on the fixing frame (1); the top cover (212) is a circular cover structure with an opening at the lower end. The lower end of the top cover (212) is sleeved outside the upper end of the central pipe (211) and is hermetically fixed to it. The first water outlet hole (201) is opened on the circumferential side of the top cover (212).

6. The quenching device for the blind hole of the motor shaft according to claim 5, characterized in that: The heating coil (3) includes two magnetic conductors (31), screws (32) and a coil (33). Among them, the two magnetic conductors (31) are arranged in abutting contact along the axial direction of the insertion pipe (21). A card slot (301) is opened on the circumferential side of the magnetic conductor (31), and the two card slots (301) are communicated with each other; the screw (32) passes through the two magnetic conductors (31). One end of it is detachably fixedly connected to the top side of the top cover (212), and the other end abuts against the top side of the upper magnetic conductor (31); The coil (33) is arranged in the card slot (301), and its two ends are respectively abutted against the two magnetic conductors (31).

7. The blind hole quenching device for a motor shaft according to claim 1, characterized in that: The fixing frame (1) includes a mounting frame (11) and a support frame (12). The insertion tube (21) penetrates through and is detachably fixed on the support frame (12). An installation groove (101) is formed on the circumferential side of the support frame (12), and the installation groove (101) penetrates to the top side and the bottom side of the support frame (12). A part of the mounting frame (11) is detachably fixed in the installation groove (101).

8. The quenching device for the blind hole of the motor shaft according to claim 7, characterized in that: The mounting frame (11) includes two mounting plates (111) and a connecting plate (112), wherein the two mounting plates (111) are arranged at intervals; one end of the connecting plate (112) is fixedly arranged between the two mounting plates (111), the other end is fixedly connected to the heating coil (3), and a part of the connecting plate (112) is detachably fixed in the installation groove (101).

9. The blind hole quenching device for a motor shaft according to claim 8, characterized in that: The mounting frame (11) further includes a reinforcing rod (113) and a reinforcing plate (114), wherein the reinforcing rod (113) is respectively fixedly arranged on both sides of the connecting plate (112), and its two ends are respectively clamped with the mounting plate (111) and the heating coil (3); the reinforcing plates (114) are respectively fixedly arranged on both sides of the connecting plate (112). Two reinforcing plates (114) are arranged on each side of the connecting plate (112). The two reinforcing plates (114) located on the same side of the connecting plate (112) are respectively abutted against the top side and the bottom side of the reinforcing rod (113). The two reinforcing plates (114) located below are detachably fixedly connected to the support frame (12).

10. A quenching device for a blind hole of a motor shaft according to claim 2, characterized in that: A plurality of first water outlet holes (201) and a plurality of second water outlet holes (401) are provided, and the plurality of first water outlet holes (201) and the plurality of second water outlet holes (401) are both arranged in a circumferential array around the center line of the insertion tube (21).

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