A strength detection device for motor shaft casting

Abstract

The present invention belongs to the technical field of motor shaft casting detection, and specifically refers to a strength detection device for motor shaft castings, including a detection platform, a guide platform, a support frame, a closed clamping mechanism and a resistance detection type strength measurement mechanism, wherein the support frame is symmetrically arranged on the upper wall of the detection platform, the guide platform is arranged on the upper wall of the support frame, the closed clamping mechanism is arranged on the guide platform, and the resistance detection type strength measurement mechanism is arranged on the closed clamping mechanism, and the closed clamping mechanism includes a guide mechanism, a wall-attaching mechanism and a debris removal mechanism. The present invention provides a strength detection device for motor shaft castings that can clean dust adhered to the surface of motor shaft castings by gas flow force, thereby improving the accuracy of the strength detection result of motor shaft castings using air flow.

Description

Technical Field

[0001] The invention belongs to the technical field of motor shaft casting detection, and specifically refers to a strength detection device for a motor shaft casting. Background Art

[0002] Motor shaft casting is a component used in the manufacture of motor shafts, usually made by casting methods. Motor shaft castings usually have the characteristics of wear resistance, high temperature resistance and high strength to ensure the normal operation and stability of the motor.

[0003] The existing strength detection device for motor shaft castings has the following problems:

[0004] The existing strength detection device for motor shaft castings has relatively simple functions. It does not have the ability to detect the flatness and roughness of the surface of the motor shaft casting, and does not have the ability to clean impurities on the surface of the motor shaft casting. The recessed parts on the surface of the motor shaft casting often retain and fill with dust, which will affect the detection data of the surface smoothness of the motor shaft casting, thereby causing deviations in the strength detection results of the motor shaft casting. Therefore, it cannot meet the existing use requirements of the motor shaft casting strength detection device. Summary of the invention

[0005] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a strength detection device for motor shaft castings that can clean the dust adhered to the surface of the motor shaft casting by gas flow force, thereby improving the accuracy of the strength detection results of the motor shaft castings using air flow.

[0006] The present scheme proposes a strength detection device for a motor shaft casting, comprising a detection platform, a guide platform, a support frame, a closed clamping mechanism and a resistance detection type strength measurement mechanism, wherein the support frame is symmetrically arranged on the upper wall of the detection platform, the guide platform is arranged on the upper wall of the support frame, the closed clamping mechanism is arranged on the guide platform, and the resistance detection type strength measurement mechanism is arranged on the closed clamping mechanism, the closed clamping mechanism comprises a guide mechanism, a wall-attaching mechanism and a debris removal mechanism, the guide mechanism is arranged on the upper wall of the guide platform, the wall-attaching mechanism is arranged on a side of the guide mechanism away from the guide platform, the debris removal mechanism is arranged on the wall-attaching mechanism, the resistance detection type strength measurement mechanism comprises a dust detection mechanism and a wind detection mechanism, the dust detection mechanism is arranged on a side of the guide mechanism away from the wall-attaching mechanism, and the wind detection mechanism is arranged on the wall-attaching mechanism.

[0007] The guide mechanism includes a guide column, an air guide cylinder, a spring, a sliding magnet and a fixed electromagnet. The guide column passes through the inner wall of the middle part of the guide platform. The air guide cylinder is slidably arranged at both ends of the guide column. The air guide cylinder is symmetrically arranged up and down. The spring is arranged between the air guide cylinder outside the guide column and the guide platform. The sliding magnet is respectively arranged on the side of the air guide cylinder outside the guide column away from the guide platform. The fixed electromagnet is arranged on both sides of the guide column symmetrically up and down, and the fixed electromagnet is arranged opposite to the sliding magnet; the wall-attaching mechanism includes an air guide duct, a semicircular channel, a sealing strip, a semicircular arc plate, a smooth wear-resistant plate and a channel frame. The channel frame is symmetrically arranged on the side wall of the air guide cylinder. The semicircular channel is arranged between the channel frames, and the semicircular channel is open at one end The semicircular channels are arranged relatively to each other, the semicircular arc plates are arranged through the inner walls at both ends of the semicircular channels, the sealing strips are respectively arranged on the side walls of the semicircular channel opening and the inner walls of the semicircular arc plates, the smooth wear-resistant plates are arranged on the inner walls of the semicircular channels, and the air duct is connected between the air cylinder and the semicircular channel; the impurity removal mechanism comprises a motor seat, an air pump, a glass ball cylinder, a dust exhaust port and an air inlet pipe, the motor seat is arranged on the side of the semicircular channel away from the sealing strip, the air pump is arranged on the side of the motor seat away from the semicircular channel, the air inlet pipe is connected between the side of the semicircular channel away from the air duct and the exhaust end of the air pump, the glass ball cylinder is connected on the side of the air cylinder away from the semicircular channel, and the dust exhaust port is arranged on the side of the glass ball cylinder away from the air cylinder.

[0008] When in use, the air guide cylinder slides along the guide column through the channel frame to drive the semicircular channels to move in opposite directions. At this time, the distance between the semicircular channels increases. When the motor shaft casting is placed between the semicircular channels, the fixed electromagnets are fixed on both sides of the guide column and energized to generate magnetism. The fixed electromagnets and the sliding magnets are set with the same poles. The fixed electromagnets push the sliding magnets through repulsive force. The sliding magnets drive the air guide cylinder to slide along the guide column under the deformation of the spring. The air guide cylinder drives the semicircular channels to move relative to each other through the air guide duct, and the semicircular channels drive the sealing strips to fit each other.

[0009] Preferably, the dust detection mechanism includes a spotlight and a light intensity sensor, the spotlight is arranged on the side wall of the glass ball tube, and the light intensity sensor is arranged on the side of the glass ball tube away from the spotlight; the wind detection mechanism includes a gas initial velocity sensor and a gas final velocity sensor, the gas initial velocity sensor is arranged at one end of the semicircular channel close to the vacuum pump, the detection end of the gas initial velocity sensor passes through the semicircular channel and is arranged on the inner wall of the smooth wear-resistant plate, and the gas final velocity sensor is arranged at one end of the semicircular channel away from the gas initial velocity sensor, and the detection end of the gas final velocity sensor passes through the semicircular channel and is arranged on the inner wall of the smooth wear-resistant plate.

[0010] When in use, the spotlight emits light to illuminate the detection end of the light intensity sensor, the light intensity sensor detects the light intensity of the spotlight, the vacuum pump draws outside air through the vacuum end, the outside air enters into the air intake pipe through the exhaust end, the air inside the air intake pipe enters into the semicircular channel, the airflow circulating inside the semicircular channel flushes the dust adhered to the surface of the motor shaft casting, the dust-containing gas flows into the glass ball tube and is discharged through the dust exhaust port.

[0011] Specifically, the support frame is provided with a controller.

[0012] Wherein, the controller is electrically connected to the fixed electromagnet, the air pump, the spotlight, the light intensity sensor, the gas initial velocity sensor and the gas final velocity sensor respectively.

[0013] Preferably, the model of the controller is HAD-SC200.

[0014] The beneficial effects achieved by adopting the above structure are as follows:

[0015] Compared with the prior art, the present invention adopts the effect of gas flow rate and flow force, and through the closed clamping mechanism and the resistance detection strength measuring mechanism, under the action of the guiding mechanism, the wall-adhering mechanism, the impurity removal mechanism, the dust detection mechanism and the wind detection mechanism, the impurities on the surface of the motor shaft casting can be cleaned by the flow force of the gas, so that the depressions on the surface of the motor shaft casting are revealed, which is convenient for improving the detection efficiency of the flatness of the surface of the motor shaft casting. When the gas flow velocity detected by the gas terminal velocity sensor varies greatly with respect to the gas flow velocity detected by the gas initial velocity sensor, it means that the gas encounters a large flow resistance in the semicircular channel, which means that the surface of the motor shaft casting is rough, shortening the service life of the motor. Therefore, it is necessary to process the surface of the motor shaft casting in order to improve the strength of the motor shaft casting. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of this scheme;

[0017] Figure 2 This is the main stereogram of the scheme;

[0018] Figure 3 This is a bottom-up stereogram of the scheme;

[0019] Figure 4 This is the main view of this scheme;

[0020] Figure 5 This is the left view of this scheme;

[0021] Figure 6 This is the right view of this scheme;

[0022] Figure 7This is a top view of the scheme;

[0023] Figure 8 for Figure 4 AA section view of the part;

[0024] Fig. 9 for Figure 7 A cross-sectional view of the BB portion;

[0025] Fig.10 for Figure 1 Part I shows a magnified structural view.

[0026] Among them, 1. detection table, 2. closed clamping mechanism, 3. guide mechanism, 4. guide column, 5. air guide cylinder, 6. spring, 7. sliding magnet, 8. fixed electromagnet, 9. wall-attaching mechanism, 10. air guide duct, 11. semicircular channel, 12. sealing strip, 13. impurity removal mechanism, 14. motor seat, 15. vacuum pump, 16. glass ball cylinder, 17. dust exhaust port, 18. dust detection mechanism, 19. spotlight, 20. light intensity sensor, 21. wind detection mechanism, 22. gas initial velocity sensor, 23. gas final velocity sensor, 24. resistance detection type strength measurement mechanism, 25. guide table, 26. air intake pipe, 27. semicircular arc plate, 28. support frame, 29. smooth wear-resistant plate, 30. controller, 31. channel frame.

[0027] The accompanying drawings are used to provide further understanding of the present scheme and constitute a part of the specification. Together with the embodiments of the present scheme, they are used to explain the present scheme and do not constitute a limitation on the present scheme. DETAILED DESCRIPTION

[0028] The technical scheme in the embodiments of the present scheme will be clearly and completely described below in conjunction with the drawings in the embodiments of the present scheme. Obviously, the described embodiments are only part of the embodiments of the present scheme, not all of the embodiments; based on the embodiments in the present scheme, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present scheme.

[0029] In the description of this scheme, it should be understood that terms such as "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this scheme and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on this scheme.

[0030] like Figure 1-Figure 10As shown, the present scheme proposes a strength detection device for a motor shaft casting, comprising a detection platform 1, a guide platform 25, a support frame 28, a closed type clamping mechanism 2 and a resistance detection type strength measurement mechanism 24, wherein the support frame 28 is symmetrically arranged on the upper wall of the detection platform 1, the guide platform 25 is arranged on the upper wall of the support frame 28, the closed type clamping mechanism 2 is arranged on the guide platform 25, the resistance detection type strength measurement mechanism 24 is arranged on the closed type clamping mechanism 2, the closed type clamping mechanism 2 comprises a guide mechanism 3, a wall-attaching mechanism 9 and a debris removal mechanism 13, the guide mechanism 3 is arranged on the upper wall of the guide platform 25, the wall-attaching mechanism 9 is arranged on the side of the guide mechanism 3 away from the guide platform 25, the debris removal mechanism 13 is arranged on the wall-attaching mechanism 9, the resistance detection type strength measurement mechanism 24 comprises a dust detection mechanism 18 and a wind detection mechanism 21, the dust detection mechanism 18 is arranged on the side of the guide mechanism 3 away from the wall-attaching mechanism 9, and the wind detection mechanism 21 is arranged on the wall-attaching mechanism 9.

[0031] The guide mechanism 3 includes a guide column 4, an air guide cylinder 5, a spring 6, a sliding magnet 7 and a fixed electromagnet 8. The guide column 4 passes through the inner wall of the middle part of the guide platform 25, the air guide cylinder 5 is slidably arranged at both ends of the guide column 4, and the air guide cylinder 5 is symmetrically arranged up and down. The spring 6 is arranged between the air guide cylinder 5 on the outside of the guide column 4 and the guide platform 25. The sliding magnet 7 is respectively arranged on the side of the air guide cylinder 5 on the outside of the guide column 4 away from the guide platform 25. The fixed electromagnet 8 is arranged on both sides of the guide column 4 symmetrically up and down, and the fixed electromagnet 8 is arranged opposite to the sliding magnet 7; the wall-attaching mechanism 9 includes an air guide duct 10, a semicircular channel 11, a sealing strip 12, a semicircular arc plate 27, a smooth wear-resistant plate 29 and a channel frame 31. The channel frame 31 is symmetrically arranged on the side wall of the air guide cylinder 5, the semicircular channel 11 is arranged between the channel frames 31, the semicircular channel 11 is opened at one end, and the semicircular channel 1 1 are arranged relatively, the semicircular plate 27 is penetrated and arranged on the inner walls at both ends of the semicircular channel 11, the sealing strip 12 is respectively arranged on the side wall of the opening of the semicircular channel 11 and the inner wall of the semicircular plate 27, the smooth wear-resistant plate 29 is arranged on the inner wall of the semicircular channel 11, and the air duct 10 is communicated and arranged between the air guide cylinder 5 and the semicircular channel 11; the impurity removal mechanism 13 includes a motor seat 14, an air pump 15, a glass ball cylinder 16, a dust discharge port 17 and an air inlet pipe 26, the motor seat 14 is arranged on the side of the semicircular channel 11 away from the sealing strip 12, the air pump 15 is arranged on the side of the motor seat 14 away from the semicircular channel 11, the air inlet pipe 26 is communicated and arranged between the side of the semicircular channel 11 away from the air duct 10 and the exhaust end of the air pump 15, the glass ball cylinder 16 is communicated and arranged on the side of the air guide cylinder 5 away from the semicircular channel 11, and the dust discharge port 17 is arranged on the side of the glass ball cylinder 16 away from the air guide cylinder 5.

[0032] The dust detection mechanism 18 includes a spotlight 19 and a light intensity sensor 20, wherein the spotlight 19 is arranged on the side wall of the glass ball tube 16, and the light intensity sensor 20 is arranged on the side of the glass ball tube 16 away from the spotlight 19; the wind detection mechanism 21 includes a gas initial velocity sensor 22 and a gas final velocity sensor 23, wherein the gas initial velocity sensor 22 is arranged at one end of the semicircular channel 11 close to the vacuum pump 15, and the detection end of the gas initial velocity sensor 22 passes through the semicircular channel 11 and is arranged on the inner wall of the smooth wear-resistant plate 29, and the gas final velocity sensor 23 is arranged at one end of the semicircular channel 11 away from the gas initial velocity sensor 22, and the detection end of the gas final velocity sensor 23 passes through the semicircular channel 11 and is arranged on the inner wall of the smooth wear-resistant plate 29.

[0033] A controller 30 is disposed on the side wall of the support frame 28 .

[0034] The controller 30 is electrically connected to the fixed electromagnet 8 , the air pump 15 , the spotlight 19 , the light intensity sensor 20 , the gas initial velocity sensor 22 , and the gas final velocity sensor 23 , respectively.

[0035] The model of the controller 30 is HAD-SC200.

[0036] When in use, the dust suction pipe of the external dust removal device is connected to the dust discharge port 17. In the initial state, the spring 6 is in an extended state, and the air guide cylinder 5 slides along the guide column 4 through the channel frame 31 to drive the semicircular channels 11 to move in opposite directions. At this time, the distance between the semicircular channels 11 is the maximum value;

[0037] When the strength of the motor shaft casting needs to be tested, the motor shaft casting is placed on the upper wall of the semicircular arc plate 27 below the guide platform 25, the bottom wall of the motor shaft casting is fitted with the sealing strip 12, the controller 30 controls the fixed electromagnet 8 to start, the fixed electromagnet 8 is fixed on both sides of the guide column 4 and energized to generate magnetism, the fixed electromagnet 8 and the sliding magnet 7 are arranged with the same pole, the fixed electromagnet 8 pushes the sliding magnet 7 through repulsion, the sliding magnet 7 drives the air guide tube 5 to slide along the guide column 4 by the deformation of the spring 6, the air guide tube 5 drives the semicircular channel 11 to move relative to each other through the channel frame 31, the semicircular channel 11 drives the sealing strips 12 to fit each other, the sealing strip 12 above the guide platform 25 is fitted with the upper wall of the motor shaft casting, the sealing strip 12 is wrapped around the outside of the motor shaft casting, and the sealing operation of the space formed by the semicircular channel 11 is completed;

[0038] When testing the strength of the motor shaft casting, it is necessary to remove impurities on its surface. The controller 30 controls the vacuum pump 15 to start. The vacuum pump 15 extracts outside air through the vacuum end. The outside air enters the air inlet pipe 26 through the exhaust end. The air in the air inlet pipe 26 enters the semicircular channel 11. The airflow flowing in the semicircular channel 11 flushes the impurities adhered to the surface of the motor shaft casting. The dust-containing gas passes through the space formed by the semicircular channels 11 and flows into the glass ball cylinder 16 through the air guide pipe. The dust-containing gas in the glass ball cylinder 16 is discharged through the dust outlet 17. The dust-containing gas discharged from the dust outlet 17 enters the dust removal equipment for filtration.

[0039] The controller 30 controls the spotlight 19 and the light intensity sensor 20 to start, and the light emitted by the spotlight 19 passes through the glass bulb 16 and irradiates the detection end of the light intensity sensor 20, and the light intensity sensor 20 detects the light intensity of the spotlight 19;

[0040] When the dust-laden gas enters the glass ball cylinder 16, the light intensity of the spotlight 19 detected by the light intensity sensor 20 weakens due to the presence of dust in the gas. As the gas continues to flow, the dust on the surface of the motor shaft casting is completely removed. When the light intensity of the spotlight 19 detected by the light intensity sensor 20 returns to the initial value, it indicates that the dust concentration in the gas is reduced and the dust on the surface of the motor shaft casting is cleaned.

[0041] The flatness of the motor shaft casting surface is tested. The higher the surface roughness of the motor shaft casting, the lower the fatigue strength, and the more obvious the microscopic protrusions and valleys on the surface. The microscopic unevenness will cause stress concentration when the motor shaft casting is subjected to force. Stress concentration will cause the motor shaft casting to crack or break under a small external force, thereby reducing its strength.

[0042] The controller 30 controls the gas initial velocity sensor 22 to start, and the gas initial velocity sensor 22 detects the gas flow rate at one end of the semicircular channel 11 close to the air pump 15. The controller 30 controls the gas final velocity sensor 23 to start, and the gas final velocity sensor 23 detects the gas flow rate at one end of the semicircular channel 11 close to the glass ball cylinder 16.

[0043] When gas flows through a pipe with a high inner wall roughness, its flow velocity will decrease. When the gas flow velocity detected by the gas terminal velocity sensor 23 changes greatly relative to the gas flow velocity detected by the gas initial velocity sensor 22, it means that the gas encounters a large flow resistance in the semicircular channel 11, which means that the surface of the motor shaft casting is rough, shortening the service life of the motor. Therefore, the surface of the motor shaft casting needs to be processed to improve the strength of the motor shaft casting; just repeat the above operation when using it next time.

[0044] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0045] The above is a description of the present solution and its implementation methods, which is not restrictive. The drawings show only one implementation method of the present solution, and the actual structure is not limited thereto. In short, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creative design without departing from the creative purpose of the present solution, they should all fall within the protection scope of the present solution.

Claims

1. A strength detection device for a motor shaft casting, comprising a detection platform (1), a guide platform (25), and a support frame (28), characterized in that: The apparatus further comprises a closed clamping mechanism (2) and a resistance-detecting strength-measuring mechanism (24); the support frame (28) is symmetrically arranged on the upper wall of the detection platform (1); the guide platform (25) is arranged on the upper wall of the support frame (28); the closed clamping mechanism (2) is arranged on the guide platform (25); the resistance-detecting strength-measuring mechanism (24) is arranged on the closed clamping mechanism (2); the closed clamping mechanism (2) comprises a guide mechanism (3), a wall-attaching mechanism (9) and a debris-removing mechanism (13); The guide mechanism (3) is arranged on the upper wall of the guide platform (25); the wall-attaching mechanism (9) is arranged on a side of the guide mechanism (3) away from the guide platform (25); the impurity removal mechanism (13) is arranged on the wall-attaching mechanism (9); the resistance-detecting intensity measuring mechanism (24) comprises a dust-detecting mechanism (18) and a wind-detecting mechanism (21); the dust-detecting mechanism (18) is arranged on a side of the guide mechanism (3) away from the wall-attaching mechanism (9); and the wind-detecting mechanism (21) is arranged on the wall-attaching mechanism (9).

2. The strength detection device for a motor shaft casting according to claim 1, characterized in that: The guide mechanism (3) comprises a guide column (4), an air guide cylinder (5), a spring (6), a sliding magnet (7) and a fixed electromagnet (8); the guide column (4) penetrates the inner wall of the middle part of the guide platform (25); the air guide cylinder (5) is slidably arranged at both ends of the guide column (4); the air guide cylinder (5) is symmetrically arranged up and down; the spring (6) is arranged between the air guide cylinder (5) outside the guide column (4) and the guide platform (25); the sliding magnet (7) is respectively arranged on the side of the air guide cylinder (5) outside the guide column (4) away from the guide platform (25); the fixed electromagnet (8) is arranged on both sides of the guide column (4) symmetrically up and down; the fixed electromagnet (8) and the sliding magnet (7) are arranged opposite to each other.

3. The strength detection device for a motor shaft casting according to claim 2, characterized in that: The wall-adhering mechanism (9) comprises an air guide tube (10), a semicircular channel (11), a sealing strip (12), a semicircular plate (27), a smooth wear-resistant plate (29) and a channel frame (31); the channel frame (31) is symmetrically arranged on the side wall of the air guide cylinder (5); the semicircular channel (11) is arranged between the channel frames (31); the semicircular channel (11) is arranged with an opening at one end; the semicircular channels (11) are arranged opposite to each other; the semicircular plate (27) is penetrated through the inner walls at both ends of the semicircular channel (11); the sealing strip (12) is respectively arranged on the side wall of the opening of the semicircular channel (11) and the inner wall of the semicircular plate (27); the smooth wear-resistant plate (29) is arranged on the inner wall of the semicircular channel (11); and the air guide tube (10) is arranged between the air guide cylinder (5) and the semicircular channel (11) in communication.

4. The strength detection device for a motor shaft casting according to claim 3 is characterized in that: The impurity removal mechanism (13) comprises a motor base (14), an air pump (15), a glass ball cylinder (16), a dust discharge port (17) and an air inlet pipe (26); the motor base (14) is arranged on a side of the semicircular channel (11) away from the sealing strip (12); the air pump (15) is arranged on a side of the motor base (14) away from the semicircular channel (11); the air inlet pipe (26) is arranged in communication between a side of the semicircular channel (11) away from the air guide pipe (10) and an exhaust end of the air pump (15); the glass ball cylinder (16) is arranged in communication with a side of the air guide cylinder (5) away from the semicircular channel (11); and the dust discharge port (17) is arranged on a side of the glass ball cylinder (16) away from the air guide cylinder (5).

5. The strength detection device for a motor shaft casting according to claim 4, characterized in that: The dust detection mechanism (18) comprises a spotlight (19) and a light intensity sensor (20); the spotlight (19) is arranged on a side wall of the glass ball tube (16); and the light intensity sensor (20) is arranged on a side of the glass ball tube (16) away from the spotlight (19).

6. The strength detection device for a motor shaft casting according to claim 5, characterized in that: The air detection mechanism (21) comprises a gas initial velocity sensor (22) and a gas final velocity sensor (23); the gas initial velocity sensor (22) is arranged at one end of the semicircular channel (11) close to the air pump (15); a detection end of the gas initial velocity sensor (22) passes through the semicircular channel (11) and is arranged on the inner wall of the smooth wear-resistant plate (29); and the gas final velocity sensor (23) is arranged at one end of the semicircular channel (11) away from the gas initial velocity sensor (22); a detection end of the gas final velocity sensor (23) passes through the semicircular channel (11) and is arranged on the inner wall of the smooth wear-resistant plate (29).

7. The strength detection device for a motor shaft casting according to claim 6, characterized in that: The support frame (28) is provided with a controller (30).

8. The strength detection device for a motor shaft casting according to claim 7, characterized in that: The controller (30) is electrically connected to the fixed electromagnet (8), the air pump (15), the spotlight (19), the light intensity sensor (20), the gas initial velocity sensor (22), and the gas final velocity sensor (23), respectively.

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