A measurement method for a conical surface interference fit press-in measurement device

Abstract

This invention relates to the technical field of traction motor and gear mounting devices for railway locomotives and rolling stock, and particularly to a measuring device and method for measuring the pressing amount of a conical interference fit. The rangefinder consists of a laser emitting system, a laser receiving system, a housing, and cables. The axial pressing amount between the motor shaft and gear connected by an external conical interference fit is essentially the axial displacement of the gear on the motor shaft after pressing relative to its position before pressing, i.e., the difference between the two axial positions. This method of measuring the pressing amount of a conical interference fit avoids the potential harm to the operator from high-temperature parts during traditional manual measurement; it also completely avoids the errors in the measuring scale length and internal distance of the rangefinder; the method is highly efficient and accurate, ensuring the quality of assembly operations, and thus greatly reducing accidents such as gear loosening and mid-journey stoppages caused by problems in the assembly of the gear and motor shaft, which disrupt the normal production order of the railway.

Description

Technical Field

[0001] This invention relates to an automated detection method and device for the assembly pressing amount of a traction motor and gear in a railway locomotive and rolling stock using a conical surface interference fit connection, and more particularly to a measurement method for a conical surface interference fit pressing amount measuring device. Background Technology

[0002] In railway locomotives (or power vehicles), the torque of the traction motor is transmitted to the wheelset via a traction gear pair to achieve traction. The driving gear and the motor shaft are typically fixed with an interference fit using an external conical surface to facilitate removal and replacement of the driving gear from the motor shaft. When assembling the gear onto the motor shaft, the gear is usually heated, utilizing the principle of thermal expansion and contraction to enlarge the gear's inner bore. The gear is then fitted onto the motor shaft and pushed into the appropriate position. During this process, to ensure the interference fit meets specified requirements, the axial pressing amount must also meet the expected requirements. To obtain an accurate axial pressing amount, before pressing, the gear at room temperature is fitted onto the motor shaft and gently pushed against the motor side. The axial relative position data at this point is measured and used as the basis for calculating the pressing amount. The gear is then removed from the motor shaft and heated to a specified temperature. The heated gear is then fitted onto the motor shaft again and pressed until it reaches the limit device or cannot be pushed further. The axial relative position data is measured again at this point, and the difference between the two axial relative position data is the pressing amount.

[0003] The traditional method for measuring the axial relative position of a gear to the motor shaft is to use a depth gauge for manual measurement. Manual measurement has two disadvantages: first, the high temperature of the gear in its hot state can be harmful to the human body, so the measurement process must be carried out carefully to avoid contact between exposed parts of the body and the gear; second, the process of manual measurement, reading, pressing amount calculation, and recording is inefficient and prone to errors. Summary of the Invention

[0004] The present invention aims to solve the above-mentioned defects and provide a measurement method for a device for measuring the amount of press-in of a conical surface interference fit.

[0005] To overcome the deficiencies in the prior art, the technical solution adopted by this invention to solve its technical problem is as follows: This device for measuring the press-in amount of a conical surface interference fit includes a rangefinder. The rangefinder includes a base, a vertical rod, a sliding rod, a housing, and a clamping device. The vertical rod is fixedly installed on the base, and the sliding rod is fixed to the vertical rod by the clamping device. The housing is connected to the horizontally arranged sliding rod by a built-in elastic element. A laser emitting system and a laser receiving system are arranged vertically within the housing. The laser emitting system consists of a red laser emitting device and a green laser emitting device arranged side-by-side within the housing. The receiving system consists of a red laser receiver and a green laser receiver arranged side by side inside the housing. The red laser transmitter and the green laser transmitter share a set of sinusoidal circuits for driving the laser diodes inside the red laser transmitter and the green laser transmitter. The red laser receiver and the green laser receiver are equipped with photoelectric conversion elements. A reference plane perpendicular to the laser emission path is provided on the housing in the laser emission direction. The housing is also equipped with cables for obtaining power from the outside, receiving power on / off and detection commands, and sending detection data. The cables connect the laser emission system and the laser receiving system inside the housing.

[0006] According to another embodiment of the present invention, when the laser emitted by the red laser emitting device and the green laser emitting device is directed toward the metal surface to be measured at a position 200 mm in front and perpendicular to the direction of the light, a red light spot and a green light spot are formed on the surface to be measured, and the center of the two light spots are about 20 mm apart.

[0007] According to another embodiment of the present invention, the red laser receiving device and the green laser receiving device are each configured with a narrowband filter centered on the laser wavelength emitted by the red laser emitting device and the green laser emitting device, respectively.

[0008] According to another embodiment of the present invention, the sine wave circuit further modulates the wavelength of the sine wave, half of which is the measuring scale length L, and the measuring scale length L is greater than 1.5 times the upper limit of the press-in required to achieve the interference fit of the conical surface.

[0009] According to another embodiment of the present invention, the distances from the emission points of the two laser diodes in the red laser emitting device and the green laser emitting device to the reference plane are equal, with an allowable deviation of ±0.5mm; the distances from the two photoelectric conversion elements in the red laser receiving device and the green laser receiving device to the reference plane are equal, with an allowable deviation of ±0.5mm.

[0010] A method for measuring the press-in amount of a conical surface interference fit, the method comprising: S1. Place the rangefinder in front of the extended end face of the motor shaft, ensuring the rangefinder's reference plane faces the motor shaft end face. Adjust the height of the rangefinder using the clamping device so that the laser emission port of the rangefinder is approximately level with the center of the motor shaft. Use a ruler with 1mm accuracy to ensure the distance between the rangefinder's reference plane and the motor shaft end face. One gear thickness should be left unattended. In addition, a distance of 30-50mm, and With the built-in distance of the rangefinder Divide by the length of the measuring tape The resulting decimal is 0.5 ± 0.1; S2. Connect the cable (14) on the rangefinder to the host computer. Send a power-on command to the rangefinder through the host computer. The rangefinder can work stably after warming up for 10 minutes. S3. Place the gear at room temperature onto the motor shaft and gently push it toward the motor side until it can no longer be pushed. S4. The host computer sends a detection command to the rangefinder. At this time, there is one light spot on each of the motor shaft end face and the gear hub end face. The lateral sliding housing makes the two light spots evenly distributed on both sides of the mating surface of the two workpieces. The rangefinder sends the position detection data of the motor shaft end face and the gear hub end face to the host computer in real time via cable. and Detection data and For less than the length of the measuring ruler In this part, the host computer display refreshes the detection data in real time; S5. After the detection data in step S4 stabilizes or after 0.5 seconds, the host computer collects the data. and They are respectively denoted as and ; S6. Remove the gear from the motor shaft, heat it to the specified temperature, and then put the hot gear back onto the motor shaft. Gently push it towards the motor side until it can no longer be pushed. Perform the test according to step S4. After the test data stabilizes or after 0.5 seconds, the host computer collects the position detection data of the motor shaft end face and the gear hub end face. and Detection data and For less than the length of the measuring ruler The parts are respectively denoted as and ; S7. Based on the detection data from steps S5 and S6, calculate the assembly pressing amount using the following formula. .

[0011] According to another embodiment of the present invention, the rangefinder further includes a built-in distance sensor. This represents the average of four distances: from the laser diode emission point in the red laser emitting device to the reference plane, from the laser diode emission point in the green laser emitting device to the reference plane, from the photoelectric conversion element in the red laser receiving device to the reference plane, and from the photoelectric conversion element in the green laser receiving device to the reference plane.

[0012] The beneficial effects of this invention are as follows: This method of measuring the press-in amount of a conical surface interference fit avoids the potential harm to the operator caused by high-temperature parts during traditional manual measurement; it completely eliminates the errors in the measuring scale length and internal distance of the rangefinder; and because the emission point and receiving point are fixed on the same device and the two optical paths are very close, the measurement error caused by the working environment is negligible. These are advantages compared to single-path laser rangefinders. This method has high efficiency and high accuracy, ensuring the quality of assembly operations, and thus greatly reducing accidents that affect the normal production order of railways, such as gear loosening and mid-journey stoppages, caused by problems in the assembly of gears and motor shafts. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0014] Figure 1 This is a schematic diagram of the measurement system structure of the present invention; Figure 2 yes Figure 1 A view from direction A is a schematic diagram of the distance measuring instrument and measuring device. Figure 3 yes Figure 1 The B-direction view is a schematic diagram of the laser spot position.

[0015] The components are: 1. Rangefinder, 2. Base, 3. Vertical rod, 4. Sliding rod, 5. Clamping device, 6. Red laser emitting device, 7. Green laser emitting device, 8. Red laser receiving device, 9. Green laser receiving device, 10. Reference surface, 11. Laser emitting system, 12. Laser receiving system, 13. Housing, 14. Cable, 15. Motor, 16. Gear. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0017] The axial press-in amount between the motor shaft and gear, which are connected by an interference fit of an external conical surface, is essentially the axial displacement of the gear on the motor shaft after press-fitting, relative to its position before press-fitting, i.e., the difference between the two axial positions. This invention uses phase-type laser ranging technology to achieve non-contact measurement of axial position, and the measuring device, namely the rangefinder, is the core of this invention.

[0018] like Figure 2 As shown in the figure, a rangefinder 1 is included. The rangefinder 1 includes a base 2, a vertical rod 3, a sliding rod 4, a housing 13, and a clamping device 5. The vertical rod 3 is fixedly installed on the base 2, and the sliding rod 4 is fixed to the vertical rod 3 by the clamping device 5. The housing 13 is connected to the horizontally arranged sliding rod 4 by a built-in elastic element. A laser emitting system 11 and a laser receiving system 12 are provided inside the housing 13. The laser emitting system 11 and the laser receiving system 12 are arranged vertically. The laser emitting system 11 consists of a red laser emitting device 6 and a green laser emitting device 7 arranged side by side inside the housing 13. The laser receiving system 12 consists of a red laser emitting device 6 and a green laser emitting device 7 arranged side by side inside the housing 13. The system consists of a light receiving device 8 and a green laser receiving device 9. The red laser emitting device 6 and the green laser emitting device 7 share a set of frequency-stabilized sinusoidal circuits for driving the laser diodes inside the red laser emitting device 6 and the green laser emitting device 7. The red laser receiving device 8 and the green laser receiving device 9 are equipped with photoelectric conversion elements. A reference plane 10 perpendicular to the laser emission path is provided on the housing 13 in the laser emission direction. The housing 13 is also equipped with a cable 14 for obtaining power from the outside, receiving power on / off commands and detection commands, and sending detection data. The cable 14 connects the laser emitting system 11 and the laser receiving system 12 inside the housing 13.

[0019] When the laser emitted by the red laser emitting device 6 and the green laser emitting device 7 is directed at the metal surface to be measured, which is 200mm in front and perpendicular to the direction of the laser beam, a red spot and a green spot are formed on the surface to be measured, with the center of the two spots about 20mm apart.

[0020] The red laser receiver 8 and the green laser receiver 9 are each equipped with a narrowband filter centered on the wavelengths of the lasers emitted by the red laser emitter 6 and the green laser emitter 7, respectively. The purpose of each system having a narrowband filter is to prevent mutual interference between the two laser systems.

[0021] Among them, the sine wave circuit modulates the wavelength of the sine wave, and half of the sine wave wavelength is the measuring scale length L. The measuring scale length L is greater than 1.5 times the upper limit of the press-in amount required to achieve the interference fit of the conical surface.

[0022] Among them, the distance from the laser diode emission point in the red laser emitting device 6 to the reference surface 10 is equal to the distance from the laser diode emission point in the green laser emitting device 7 to the reference surface 10, with an allowable deviation of ±0.5mm; the distance from the photoelectric conversion element in the red laser receiving device 8 to the reference surface 10 is equal to the distance from the photoelectric conversion element in the green laser receiving device 9 to the reference surface 10, with an allowable deviation of ±0.5mm.

[0023] A method for measuring the press-in amount of a conical surface interference fit, the method comprising: S1, such as Figure 1 As shown, a rangefinder 1 is placed in front of the end face of the motor shaft protruding from the motor 15, with the reference surface 10 of the rangefinder 1 facing the end face of the motor shaft. The height of the rangefinder is adjusted by the clamping device 5 so that the laser emission port of the rangefinder is basically at the same height as the center of the motor shaft. A ruler with an accuracy of 1mm is used to ensure the distance between the reference surface 10 of the rangefinder and the end face of the motor shaft. One gear thickness should be left unattended. Add a distance of 30-50mm, and ensure the length from the reference plane 10 to the end face of the motor shaft. With the built-in distance of the rangefinder Sum divided by the length of the measuring tape The resulting decimal is 0.5 ± 0.1; S2. Connect cable 14 on rangefinder 1 to host computer. Send power-on command to rangefinder 1 through host computer. Rangefinder 1 can work stably after warming up for 10 minutes. S3. Place gear 16, which is at room temperature, onto the motor shaft and gently push it toward the motor side until it can no longer be pushed. S4. A detection command is sent to the rangefinder 1 via the host computer. At this time, there is one light spot on the end face of the motor shaft and one on the end face of the gear hub of gear 16. The transverse sliding housing 13 makes the two light spots evenly distributed on both sides of the mating surface of the two workpieces. Figure 3 As shown, the rangefinder 1 sends position detection data of the motor shaft end face and gear hub end face to the host computer in real time via cable 14. and Detection data and For less than the length of the measuring ruler In this part, the host computer display refreshes the detection data in real time; S5. After the detection data in step S4 stabilizes or after 0.5 seconds, the host computer collects the data. and They are respectively denoted as and ; S6. Remove gear 16 from the motor shaft, heat it to the specified temperature, and then put the hot gear back onto the motor shaft. Gently push it towards the motor side until it can no longer be pushed. Perform the test according to step S4. After the test data stabilizes or after 0.5 seconds, the host computer collects the position detection data of the motor shaft end face and the gear hub end face. and Detection data and It is less than the length of the measuring ruler. The parts are respectively denoted as and ; S7. Based on the detection data from steps S5 and S6, calculate the assembly pressing amount using the following formula. .

[0024] The rangefinder has a built-in distance measurement function. The distances are the average of the following four distances: from the laser diode emission point in the red laser emitting device 6 to the reference plane 10, from the laser diode emission point in the green laser emitting device 7 to the reference plane 10, from the photoelectric conversion element in the red laser receiving device 8 to the reference plane 10, and from the photoelectric conversion element in the green laser receiving device 9 to the reference plane 10. Example

[0025] Known thickness of the gear to be assembled The diameter is 130mm, the required press-in amount for the conical surface interference fit is 3.2~4.0mm, the press-in amount measurement accuracy is 0.05mm, the gear heating temperature rise is 110~160K, and the workshop ambient temperature is 20℃.

[0026] Based on the required indentation, the measuring scale length of the rangefinder can be determined. It should be greater than 1.5 times the upper limit of the indentation, i.e., 6mm; considering the current level of phase-based laser ranging technology, the phase detection accuracy is equal to the length of the measuring scale. 1‰. In this embodiment, the length of the measuring ruler is taken. With a diameter of 20mm and a phase detection accuracy of 0.02mm, it can meet all the requirements for measuring the amount of indentation in assembly technology.

[0027] Preparation of rangefinder 1: a. such as Figure 2 As shown, the rangefinder 1 consists of a laser emitting system 11, a laser receiving system 12, a housing 13, and a cable 14. The laser emitting system 11 comprises a red laser emitting device 6 and a green laser emitting device 7 arranged side-by-side. When the laser emitted by the red laser emitting device 6 and the green laser emitting device 7 is directed towards a metal surface to be measured, positioned 200mm in front and perpendicular to the laser beam direction, two light spots with a diameter of approximately 1mm are formed on the surface to be measured, with a center-to-center distance of approximately 20mm between the two spots. Figure 3As shown. The laser receiving system 12 consists of a red laser receiving device 8 and a green laser receiving device 9 arranged side by side; in order to avoid mutual interference between the two laser systems, a narrowband filter with the laser wavelength emitted by the red laser emitting device 6 and the green laser emitting device 7 as the center wavelength is configured in the red laser receiving device 8 and the green laser receiving device 9 respectively.

[0028] b. A reference surface 10 perpendicular to the laser emission path is made on the housing 13 of the rangefinder 1 in the direction of laser emission.

[0029] c. The distances from the laser diode emission points in the red laser emitting device 6 and the green laser emitting device 7 to the reference surface 10 are basically the same, at 29.5 mm and 30.0 mm respectively; the distances from the photoelectric conversion elements in the red laser receiving device 8 and the green laser receiving device 9 to the reference surface 10 are basically the same, at 27.5 mm and 27.0 mm respectively. The built-in rangefinder... The average of these four distance values ​​is 28.5 mm.

[0030] d. To further reduce the relative measurement error between the two laser detection systems, the red laser emitting device 6 and the green laser emitting device 7 share a circuit that can generate a stable sine wave with a frequency of 7500MHz to drive the laser diodes in the red laser emitting device 6 and the green laser emitting device 7, thereby achieving synchronous modulation of the intensity of the emitted laser.

[0031] e. The rangefinder 1 obtains power from an external host computer via cable 14, receives power-on / off and detection commands, and sends detection data.

[0032] f. The rangefinder 1, base 2, vertical rod 3, sliding rod 4, and clamping device 5 are assembled into a measuring device. The clamping device 5 is used to adjust the height of the rangefinder 1 on the vertical rod 3. The rangefinder 1 is mounted on the horizontal sliding rod 4 through the inner surface of the hole on the housing 13. An elastic element is provided between the inner surface of the hole and the sliding rod, allowing the rangefinder to slide on the sliding rod 4 under a lateral force greater than 5N.

[0033] Inspection steps and methods during the gear assembly process onto the motor shaft: S1, such as Figure 1 As shown, a rangefinder 1 is placed in front of the end face of the extended end of the motor shaft, with the reference plane 10 of the rangefinder 1 facing the end face of the motor shaft. The distance between the two is... The height of the rangefinder 1 on the vertical rod 3 is adjusted by the clamping device 5 so that the height of the laser emission port of the rangefinder 1 is basically consistent with the center of the motor shaft. S2. Connect the rangefinder cable 14 to the host computer; send a power-on command to the rangefinder 1 through the host computer, and the rangefinder will preheat. After 10 minutes of preheating, the rangefinder can work stably. S3. Place the gear at room temperature onto the motor shaft and gently push the gear toward the motor side until it can no longer be pushed. S4, such as Figure 3 As shown, the host computer sends a detection command to the rangefinder 1. Red and green laser spots should be visible on the motor shaft end face and gear hub end face, respectively. The center distance between the two spots should be (20±10) mm, and they should be basically evenly distributed on both sides of the mating surfaces of the two workpieces. If necessary, the rangefinder can be pushed laterally to slide it to the desired position on the slide bar 4. The host computer display refreshes the detected position detection data of the motor shaft end face and gear hub end face in real time. and It is less than the length of the measuring ruler. Part of; S5. After the detection data stabilizes, the host computer collects the data. and The data are denoted as follows: and ; S6. Remove the gear from the motor shaft, heat it to 150℃~170℃, and quickly slip the hot gear onto the motor shaft, gently pushing it towards the motor side until it can no longer be pushed. After the test data stabilizes, the host computer collects the position detection data of the motor shaft end face and the gear hub end face. and Detection data and For less than the length of the measuring ruler The parts are respectively denoted as and ; S7. Based on the detection data from steps S5 and S6, the host computer automatically calculates the injection amount using the following formula. ; S8, Judgment Does it meet the requirement of an indentation depth of 3.2~4.0mm?

[0034] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for measuring the press-in amount of a conical surface interference fit, characterized in that, The method includes: S1. Place a rangefinder (1) in front of the end face of the motor shaft protruding from the motor (15), so that the reference surface (10) of the rangefinder (1) is facing the end face of the motor shaft. Adjust the height of the rangefinder by clamping device (5) so that the laser emission port of the rangefinder is basically at the same height as the center of the motor shaft. Use a ruler with an accuracy of 1mm to ensure the distance between the reference surface (10) of the rangefinder and the end face of the motor shaft. One gear thickness should be left unattended. In addition, a distance of 30-50mm, and With the built-in distance of the rangefinder Sum divided by the length of the measuring tape The resulting decimal is 0.5 ± 0.1; S2. Connect the cable (14) on the rangefinder (1) to the host computer. Send the power-on command to the rangefinder (1) through the host computer. The rangefinder (1) can work stably after warming up for 10 minutes. S3. Place the gear (16) at room temperature onto the motor shaft and gently push it toward the motor side until it can no longer be pushed. S4. The host computer sends a detection command to the rangefinder (1). At this time, there is one light spot on the end face of the motor shaft and one on the end face of the gear hub of the gear (16). The lateral sliding housing (13) makes the two light spots evenly distributed on both sides of the joint surface of the two workpieces. The rangefinder (1) sends the position detection data of the end face of the motor shaft and the end face of the gear hub to the host computer in real time through the cable (14). and Detection data and For less than the length of the measuring ruler In this part, the host computer display refreshes the detection data in real time; S5. After the detection data in step S4 stabilizes or after 0.5 seconds, the host computer collects the data. and They are respectively denoted as and ; S6. Remove the gear (16) from the motor shaft, heat it to the specified temperature, and then put the high-temperature gear back onto the motor shaft. Gently push it towards the motor side until it can no longer be pushed. Perform position detection according to step S4. After the detection data stabilizes or after 0.5 seconds, the host computer collects the position detection data of the motor shaft end face and the gear hub end face. and Detection data and For less than the length of the measuring ruler The parts are respectively denoted as and ; S7. Based on the detection data from steps S5 and S6, calculate the assembly pressing amount using the following formula. .

2. The measurement method of the conical surface interference fit press-in amount measuring device as described in claim 1, characterized in that, The rangefinder has a built-in distance measurement function. The distances are the average of the following four distances: the laser diode emission point in the red laser emitting device (6) to the reference plane (10), the laser diode emission point in the green laser emitting device (7) to the reference plane (10), the photoelectric conversion element in the red laser receiving device (8) to the reference plane (10), and the photoelectric conversion element in the green laser receiving device (9) to the reference plane (10).

3. The measurement method of the conical surface interference fit press-in measurement device as described in claim 1, comprising a rangefinder (1), characterized in that: The rangefinder (1) includes a base (2), a vertical rod (3), a sliding rod (4), a housing (13), and a clamping device (5). The vertical rod (3) is fixedly installed on the base (2), and the sliding rod (4) is fixed to the vertical rod (3) by the clamping device (5). The housing (13) is connected to the horizontally arranged sliding rod (4) by a built-in elastic element. The housing (13) is equipped with a laser emitting system (11) and a laser receiving system (12), which are arranged vertically. The laser emitting system (11) consists of a red laser emitting device (6) and a green laser emitting device (7) arranged side by side inside the housing (13). The laser receiving system (12) consists of a red laser emitting device (6) and a green laser emitting device (7) arranged side by side inside the housing (13). The system consists of a red laser receiver (8) and a green laser receiver (9). The red laser emitter (6) and the green laser emitter (7) share a set of sinusoidal circuits for driving the laser diodes inside the red laser emitter (6) and the green laser emitter (7) to stabilize their frequencies. The red laser receiver (8) and the green laser receiver (9) are equipped with photoelectric conversion elements. The housing (13) has a reference plane (10) perpendicular to the laser emission path in the laser emission direction. The housing (13) is also equipped with a cable (14) for obtaining power from the outside, receiving power-on and power-off commands and detection commands, and sending detection data. The cable (14) connects the laser emission system (11) and the laser receiving system (12).

4. The measurement method of the conical surface interference fit press-in amount measuring device as described in claim 3, characterized in that: When the laser emitted by the red laser emitting device (6) and the green laser emitting device (7) is directed at the metal surface to be measured at a position 200mm in front of it and perpendicular to the direction of the laser beam, a red spot and a green spot are formed on the surface to be measured, with a center-to-center distance of about 20mm between the two spots.

5. The measurement method of the conical surface interference fit press-in amount measuring device as described in claim 3, characterized in that: The red laser receiver (8) and the green laser receiver (9) are each equipped with a narrowband filter with the laser wavelength emitted by the red laser emitter (6) and the green laser emitter (7) as the center wavelength.

6. The measurement method of the conical surface interference fit press-in amount measuring device as described in claim 3, characterized in that: The sine wave circuit modulates the wavelength of the sine wave, and half of the sine wave wavelength is the measuring scale length L. The measuring scale length L is greater than 1.5 times the upper limit of the press-in amount required to achieve the interference fit of the conical surface.

7. The measurement method of the conical surface interference fit press-in amount measuring device as described in claim 3, characterized in that: The distance from the laser diode emission point in the red laser emitting device (6) to the reference surface (10) is equal to the distance from the laser diode emission point in the green laser emitting device (7) to the reference surface (10), with an allowable deviation of ±0.5mm; the distance from the photoelectric conversion element in the red laser receiving device (8) to the reference surface (10) is equal to the distance from the photoelectric conversion element in the green laser receiving device (9) to the reference surface (10), with an allowable deviation of ±0.5mm.

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