A device for measuring the outer diameter of a motor rotor

Abstract

The invention discloses a motor rotor outer diameter measuring device, belonging to the field of motor rotor detection technology. A motor rotor outer diameter measuring device comprises a column and a base, a clamping assembly is provided on the base, a lifting platform is slidably provided on the column, a rotating platform is provided at the bottom of the lifting platform, a support rod is connected to the side of the rotating platform, an annular guide rail a and an annular guide rail b are longitudinally connected to the support rod in sequence, two groups of outer diameter detection parts are connected to the annular guide rail a and the annular guide rail b, and a positioning ring is connected between the two groups of outer diameter detection parts. By arranging symmetrically distributed outer diameter detection parts on the annular guide rail and using the positioning ring to ensure the symmetrical state, synchronous measurement of four different points at one time is realized, the rotating structure design allows dynamic measurement, and the roundness deviation of the rotor is more comprehensively evaluated. The outer diameter detection part has a detection head, a guide rod and a second sleeve, which provide the guiding accuracy of the detection.

Description

Technical Field

[0001] The invention relates to the technical field of motor rotor detection, and in particular to a motor rotor outer diameter measuring device. Background Art

[0002] In modern industrial production, motors are widely used as power sources, and their performance and quality are directly related to the operating efficiency and stability of the entire equipment. As one of the core components of the motor, the dimensional accuracy of the motor rotor, especially the accuracy of the outer diameter, has a vital impact on the performance of the motor. Traditional motor rotor outer diameter measurement mostly relies on manual operation, which is not only inefficient, but also easily affected by human factors, resulting in large errors in the measurement results. With the improvement of industrial automation, higher requirements are placed on the accuracy and efficiency of motor rotor outer diameter measurement.

[0003] At present, although some automated measuring equipment has appeared on the market, these devices can only measure a single point or a few points, which makes it difficult to fully reflect the overall size of the rotor. In addition, these devices lack an effective cleaning mechanism during the measurement process, and the measurement accuracy is easily affected by surface impurities. At the same time, the existing technology also has certain limitations in the alignment and positioning of the detection head, and it is impossible to achieve high-precision dynamic measurement. Therefore, we propose a motor rotor outer diameter measurement device. Summary of the invention

[0004] The purpose of the present invention is to solve the problem of how to perform multi-point or dynamic detection on a motor rotor and improve the detection accuracy, and to propose a motor rotor outer diameter measuring device.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A device for measuring the outer diameter of a motor rotor comprises a column and a base, wherein the base is provided with a clamping assembly for a motor rotor, a lifting platform is slidably provided on the column, a driving part for driving the lifting platform to move is provided on the column, a rotating table is rotatably provided at the bottom of the lifting platform, a support rod is connected to the side of the rotating table, a rotating plate is connected to the bottom of the support rod, a fixed plate is connected to the bottom of the rotating plate, a guide piece is provided on the base, a slot is provided on the fixed plate, the guide piece is inserted into the slot to limit the rotation of the fixed plate, an annular guide rail a and an annular guide rail b are longitudinally connected to the support rod in sequence, two groups of outer diameter detection parts are connected to the annular guide rail a and the annular guide rail b, and a positioning ring is connected between the two groups of outer diameter detection parts.

[0007] Preferably, the outer diameter detection part includes a slider, the number of the sliders is two, the positioning ring is connected between the two sliders, the slider is used to be slidably connected to the annular guide rail a and the annular guide rail b, the slider is connected to a support, the support is slidably connected to a slide seat, the bottom of the support is connected to a cylinder, the output end of the cylinder is provided with a connecting plate, a first push rod is connected between the slide seat and the connecting plate, two support plates are connected to the top of the slide seat, a slide rod is slidably connected to the support plate, a second baffle is connected to the slide rod, a first spring is sleeved on the slide rod, the two ends of the first spring are respectively abutted against the second baffle plate and the support plate, one end of the slide rod is connected to the first baffle plate, and the other end is connected to the detection head, the support is connected to a displacement sensor, the output end of the displacement sensor is connected to the first detection unit, and the bottom of the slide rod is connected to the second detection unit, when the cylinder is retracted to the limit position and the first baffle plate is in contact with the support plate, the distance measured by the displacement sensor is in an initial state, and the detection head is tangent to the test axis.

[0008] Preferably, a first sealing cavity and a sliding cavity are provided in the sliding rod, a first piston is sealingly and slidingly connected in the first sealing cavity, a guide rod is connected to the first piston, the guide rod passes through the sliding rod and extends toward the detection end, a third baffle is sleeved on the guide rod, the third baffle is slidably arranged in the sliding cavity, a second spring is sleeved on the guide rod, two ends of the second spring are respectively abutted against the third baffle and the inner side of the sliding cavity, a first channel is provided in the guide rod, a first nozzle is provided at the end of the guide rod in the detection direction, a dustproof net is provided on the first nozzle, a first one-way valve is provided in the first channel, and a second one-way valve is provided outside the first sealing cavity.

[0009] Preferably, the detection end of the sliding rod is in an open state, the detection head is connected to the port of the sliding rod through screws, a first sleeve is sleeved on the outside of the detection head, the first sleeve is connected to the detection head through bolts, and the guide assembly is used to locate the detection position of the detection head and clean the surface of the electronic rotor and the end of the guide rod.

[0010] Preferably, the end of the detection head is embedded in an elastic ring piece, a through hole is opened in the middle of the elastic ring piece, the guide rod passes through the through hole, and a plurality of protrusions are provided on the surface of the guide rod, and the plurality of protrusions contact the elastic ring piece through the through hole to generate vibration.

[0011] Preferably, the guide assembly includes a second sleeve sleeved on the outside of the first sleeve, a second sealing cavity is provided on the first sleeve, a second push rod is connected to the inner side of the second sleeve, the second push rod is inserted into the second sealing cavity, a second piston is connected to the end of the second push rod away from the second sleeve, a blocking member is connected to the inner side of the second sealing cavity, a third spring is sleeved on the second push rod, and both ends of the third spring are respectively against the second sleeve and the blocking member.

[0012] Preferably, a second channel is provided in the second push rod, an inclined second nozzle is provided inside the second sleeve, the second channel is communicated with the second nozzle, a fourth one-way valve is provided in the second channel, and a third one-way valve is provided on the second sealing cavity.

[0013] Preferably, the clamping assembly includes a screw rod installed in the base, the screw rod is provided with opposite threads at two ends, the base is provided with a through groove, two symmetrical clamping plates are slidably connected to the base, a clamping block is provided on the inner side of the clamping plate, the lower end of the clamping plate is respectively connected to the two ends of the screw rod, the screw rod extends outward through the base, and the extended end of the screw rod is connected to a knob.

[0014] Preferably, a dial is provided on the fixed plate, the rotating plate is sleeved on the outside of the dial without contacting each other, and a locking piece with a pointer is provided on the rotating plate.

[0015] Compared with the prior art, the present invention provides a motor rotor outer diameter measuring device, which has the following beneficial effects:

[0016] The present invention provides symmetrically distributed outer diameter detection parts on the annular guide rails a and b, and uses positioning rings to ensure the symmetrical state, so that four different points can be synchronously measured at one time, thereby improving the measurement efficiency, enhancing the reliability of data, and effectively reducing the error that may be introduced by single-point measurement. Since the entire measuring mechanism is set as a rotating structure, it can perform rotational dynamic measurement, can perform continuous or fixed-point measurement at different positions of the motor rotor, can more comprehensively evaluate the roundness deviation of the rotor, and is suitable for occasions with high precision requirements. The design of the guide rod ensures that the detection head is accurately aligned before contacting the surface to be measured, avoiding measurement errors caused by misalignment. Error. At the same time, during the retraction of the guide rod, the first piston squeezes the gas out, which realizes the instant cleaning of the surface to be measured, effectively removes the surface particles and ensures the measurement accuracy. In addition, the vibration mechanism of the elastic ring further promotes the shedding of fine particles at the end of the detection head, and improves the overall measurement accuracy. The addition of the second sleeve expands the contact area with the surface to be measured, provides better guiding accuracy, and ensures the stable approach of the detection head. In conjunction with the action of the second piston, the gas ejected from the second nozzle not only further cleans the surface to be measured, but also specially maintains the dustproof net on the first nozzle, doubly ensuring the cleanliness of the measurement environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the structure of a motor rotor outer diameter measuring device proposed by the present invention Figure 1 ;

[0018] Figure 2 A schematic diagram of the structure of a motor rotor outer diameter measuring device proposed by the present invention Figure 2 ;

[0019] Figure 3 A schematic diagram of the structure of a motor rotor outer diameter measuring device proposed by the present invention Figure 3 ;

[0020] Figure 4 This is a front view of a motor rotor outer diameter measuring device proposed by the present invention;

[0021] Figure 5 It is a left view of a motor rotor outer diameter measuring device proposed by the present invention;

[0022] Figure 6 A top view of a motor rotor outer diameter measuring device proposed by the present invention;

[0023] Figure 7 A motor rotor outer diameter measuring device proposed by the present invention Figure 4 Full cross-sectional view of middle AA;

[0024] Figure 8A motor rotor outer diameter measuring device proposed by the present invention Figure 7 The structural diagram of the D part;

[0025] Fig. 9 A schematic diagram of the structure of the detection part of a motor rotor outer diameter measuring device proposed by the present invention Figure 1 ;

[0026] Fig.10 A schematic diagram of the structure of the detection part of a motor rotor outer diameter measuring device proposed by the present invention Figure 2 ;

[0027] Fig.11 A motor rotor outer diameter measuring device proposed by the present invention Fig.10 The structural diagram of part A in the figure;

[0028] Fig.12 A motor rotor outer diameter measuring device proposed by the present invention Fig.10 The structural diagram of part B;

[0029] Fig.13 A motor rotor outer diameter measuring device proposed by the present invention Fig.10 Schematic diagram of the structure of part C;

[0030] Fig.14 The structure of the annular guide rail a and the annular guide rail b in the motor rotor outer diameter measuring device proposed by the present invention is shown in FIG. Figure 1 ;

[0031] Fig.15 The structure of the annular guide rail a and the annular guide rail b in the motor rotor outer diameter measuring device proposed by the present invention is shown in FIG. Figure 2 ;

[0032] In the figure: 100, base; 101, column; 102, lifting platform; 103, driving part; 104, guide member; 105, through groove; 200, rotating platform; 201, support rod; 202, rotating plate; 203, fixed plate; 204, annular guide rail a; 205, annular guide rail b; 2051, positioning ring; 206, dial; 207, locking member; 208, slot; 300, slider; 301, support seat; 302, cylinder; 303, connecting plate; 304, slide seat; 305, first push rod; 306, support plate; 400, slide rod; 401, first baffle; 402, first sealing chamber; 403, slide chamber; 404, guide rod; 405, first piston; 406, first channel; 407, second baffle ;408, first spring;409, third baffle;410, second spring;411, first one-way valve;4110, second one-way valve;412, first nozzle;413, dust net;500, displacement sensor;501, first detection unit;502, second detection unit;600, detection head;601, elastic ring;602, protrusion;700, first sleeve;701, second sealing chamber;702, third one-way valve;800, second sleeve;801, second push rod;802, second piston;803, fourth one-way valve;804, third spring;805, blocking member;806, second channel;807, second nozzle;900, screw;901, knob;902, clamp;903, clamping block. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0034] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0035] Reference Figure 1-Figure 15A motor rotor outer diameter measuring device comprises a column 101 and a base 100, wherein the base 100 is provided with a clamping assembly for the motor rotor, a lifting platform 102 is slidably provided on the column 101, a driving unit 103 for driving the lifting platform 102 to move is provided on the column 101, a rotating platform 200 is rotatably provided at the bottom of the lifting platform 102, a support rod 201 is connected to the side of the rotating platform 200, a rotating plate 202 is connected to the bottom of the support rod 201, and the rotating plate 202 is connected to the bottom of the rotating plate 202. 02 A fixed plate 203 is connected to the bottom, a guide member 104 is provided on the base 100, a slot 208 is provided on the fixed plate 203, the guide member 104 is inserted into the slot 208 to limit the rotation of the fixed plate 203, and an annular guide rail a204 and an annular guide rail b205 are longitudinally connected to the support rod 201 in sequence, two groups of outer diameter detection parts are connected to the annular guide rail a204 and the annular guide rail b205, and a positioning ring 2051 is connected between the two groups of outer diameter detection parts.

[0036] By adopting the scheme of the present invention, the motor rotor is fixed by the clamping assembly on the base 100, the lifting platform 102 slides on the column 101 and is driven down by the driving part 103 to cover the motor rotor, the annular guide rail a204 and the annular guide rail b205 on the support rod 201, and the two symmetrical outer diameter detection parts on each guide rail are positioned by the positioning ring 2051 to ensure that they are always in a symmetrical state. When detecting the outer diameter, four different points can be measured synchronously at one time. Since it is set as a rotating structure, rotational dynamic measurement and measurement of different positions can also be performed.

[0037] In one embodiment, the outer diameter detection unit includes a slider 300, the number of the sliders 300 is two, the positioning ring 2051 is connected between the two sliders 300, the slider 300 is used to be slidably connected to the annular guide rail a204 and the annular guide rail b205, the slider 300 is connected to a support 301, the support 301 is slidably connected to the slider 304, the bottom of the support 301 is connected to a cylinder 302, the output end of the cylinder 302 is provided with a connecting plate 303, a first push rod 305 is connected between the slider 304 and the connecting plate 303, the top of the slider 304 is connected to two support plates 306, the support plate 306 is slidably connected to a slide rod 400, the slide rod 400 is connected to the slide rod 401, and the slide rod 401 is connected to the slide rod 402. 00 is connected with a second baffle 407, a first spring 408 is sleeved on the slide bar 400, two ends of the first spring 408 are respectively against the second baffle 407 and the support plate 306, one end of the slide bar 400 is connected with the first baffle 401, and the other end is connected with the detection head 600, the support 301 is connected with a displacement sensor 500, the output end of the displacement sensor 500 is connected with the first detection unit 501, and the bottom of the slide bar 400 is connected with the second detection unit 502, when the cylinder 302 shrinks to the limit position and the first baffle 401 is in contact with the support plate 306, the distance measured by the displacement sensor 500 is in the initial state, and the detection head 600 is tangent to the test axis.

[0038] According to the solution of the present invention, a slider 300 is slidably connected to the annular guide rail, a support 301 is provided on the slider 300, and a cylinder 302 is connected to the bottom of the support 301. The cylinder 302 drives the connecting plate 303 to move, and then the slider 304 is pushed to slide on the support 301 through the first push rod 305. A slide bar 400 is slidably connected to the support plate 306 at the top of the slide bar 304, and one end of the slide bar 400 is connected to a detection head 600. The main function of the detection head 600 is to contact the outer side of the motor rotor to drive the second detection unit 502 on the slide bar 400 to move relative to the first detection unit 501, thereby achieving a detection effect. The detection head 600 is tangent to the test axis. It can be understood that, in the initial state, the first detection unit 501 and the second detection unit 502 measure The value is "0". When the cylinder 302 contracts, the connecting plate 303 pushes the slide 304 toward the motor rotor through the first push rod 305, and the detection head 600 is in the extreme position due to the action of the first spring 408. As the cylinder 302 contracts, the detection head 600 is against the surface to be measured. At this time, the first spring 408 is squeezed and contracted. As the cylinder 302 contracts to the extreme position, the detection head 600 also reaches the precise measurement point. The relative movement distance between the first detection unit 501 and the second detection unit 502 is the radius of the motor rotor. The outer diameter of the motor shaft can be calculated and directly displayed through a computer program. The present invention can also be controlled by PLC to achieve multiple groups of detection and dynamic detection, and has high flexibility of use and technical scalability.

[0039] In one embodiment, a first sealed cavity 402 and a sliding cavity 403 are provided in the sliding rod 400, a first piston 405 is sealingly and slidably connected in the first sealed cavity 402, a guide rod 404 is connected to the first piston 405, the guide rod 404 passes through the sliding rod 400 and extends toward the detection end, a third baffle 409 is sleeved on the guide rod 404, the third baffle 409 is slidably disposed in the sliding cavity 403, a second spring 410 is sleeved on the guide rod 404, two ends of the second spring 410 are respectively abutted against the third baffle 409 and the inner side of the sliding cavity 403, a first channel 406 is provided in the guide rod 404, a first nozzle 412 is provided at the end of the guide rod 404 in the detection direction, a dustproof net 413 is provided on the first nozzle 412, a first one-way valve 411 is provided in the first channel 406, and a second one-way valve 4110 is provided outside the first sealed cavity 402.

[0040] By adopting the scheme of the present invention, during the contraction of the cylinder 302, the guide rod 404 is first in contact with the surface to be measured, and the detection head 600 can be aligned through the guide rod 404. At the same time, when the guide rod 404 retracts into the sliding rod 400, the first piston 405 is pushed to squeeze the air in the first sealing cavity 402. The gas is ejected through the first nozzle 412, which can clean the surface of the object to be measured and avoid particles between the surface to be measured and the detection head 600, thereby affecting the detection accuracy. The one-way valve exists to change the gas flow direction according to the movement of the first piston 405. Since the one-way valve is a relatively mature structural design, it will not be described in detail here.

[0041] Optionally, in one embodiment, the detection end of the slide rod 400 is in an open state, the detection head 600 is connected to the port of the slide rod 400 by screws, the detection head 600 is externally sleeved with a first sleeve 700, the first sleeve 700 is connected to the detection head 600 by bolts, and a guide assembly is provided on the first sleeve 700, and the guide assembly is used to locate the detection position of the detection head 600 and clean the surface of the electronic rotor and the end of the guide rod 404.

[0042] Alternatively, the end of the detection head 600 is embedded in an elastic ring piece 601, a through hole is opened in the middle of the elastic ring piece 601, the guide rod 404 passes through the through hole, and a plurality of protrusions 602 are provided on the surface of the guide rod 404. The plurality of protrusions 602 pass through the through hole and contact the elastic ring piece 601 to generate vibration.

[0043] By adopting the solution of the present invention, during the retraction of the guide rod 404, the multiple protrusions 602 can come into contact with the elastic ring piece 601, thereby causing the elastic ring piece 601 to vibrate. Since the elastic ring piece 601 is close to the end of the detection head 600, the fine particles at the end of the detection head 600 can automatically fall off, thereby improving the detection accuracy.

[0044] It is also possible to choose that the guide assembly includes a second sleeve 800 sleeved on the outside of the first sleeve 700, a second sealed cavity 701 is provided on the first sleeve 700, a second push rod 801 is connected to the inner side of the second sleeve 800, the second push rod 801 is inserted into the second sealed cavity 701, the end of the second push rod 801 away from the second sleeve 800 is connected to the second piston 802, a blocking member 805 is connected to the inner side of the second sealed cavity 701, a third spring 804 is sleeved on the second push rod 801, the two ends of the third spring 804 are respectively against the second sleeve 800 and the blocking member 805, a second channel 806 is provided in the second push rod 801, an inclined second nozzle 807 is provided on the inner side of the second sleeve 800, the second channel 806 is communicated with the second nozzle 807, a fourth one-way valve 803 is provided in the second channel 806, and a third one-way valve 702 is provided on the second sealed cavity 701.

[0045] By adopting the solution of the present invention, the guide rod 404 contacts the surface to be measured first, and then the second sleeve 800 contacts the surface to be measured. Since the second sleeve 800 increases the contact area, it has better guiding accuracy. At the same time, the gas in the second sealing chamber 701 can be ejected from the second nozzle 807 through the second piston 802, thereby further cleaning the surface to be measured and the dustproof net 413 on the first nozzle 412.

[0046] Optionally, in one embodiment, the clamping assembly includes a screw 900 installed in the base 100, the screw 900 is provided with threads at two opposite ends, the base 100 is provided with a through groove 105, two symmetrical clamps 902 are slidably connected to the base 100, a clamping block 903 is provided on the inner side of the clamp 902, the lower end of the clamp 902 is respectively threadedly connected to the two ends of the screw 900, the screw 900 extends outward through the base 100, and the extended end of the screw 900 is connected to a knob 901.

[0047] Optionally, in one embodiment, a dial 206 is provided on the fixed plate 203 , the rotating plate 202 is sleeved outside the dial 206 without contacting each other, and a locking member 207 with a pointer is provided on the rotating plate 202 .

[0048] The present invention sets symmetrically distributed outer diameter detection parts on the annular guide rail a204 and the annular guide rail b205, and uses the positioning ring 2051 to ensure the symmetrical state, so that four different points can be synchronously measured at one time, thereby improving the measurement efficiency, enhancing the reliability of data, and effectively reducing the error that may be introduced by single-point measurement. Since the entire measuring mechanism is set as a rotating structure, it can perform rotational dynamic measurement, and can perform continuous or fixed-point measurement at different positions of the motor rotor, and can more comprehensively evaluate the roundness deviation of the rotor. It is suitable for occasions with high precision requirements. The design of the guide rod 404 ensures that the detection head 600 is accurately aligned before contacting the surface to be measured, avoiding measurement errors caused by misalignment. At the same time, During the retraction of the guide rod 404, the first piston 405 squeezes the gas to be ejected, thereby realizing instant cleaning of the surface to be measured, effectively removing surface particles, and ensuring measurement accuracy. In addition, the vibration mechanism of the elastic ring 601 further promotes the shedding of fine particles at the end of the detection head 600, thereby improving the overall measurement accuracy. The addition of the second sleeve 800 expands the contact area with the surface to be measured, provides better guiding accuracy, and ensures the stable approach of the detection head 600. In conjunction with the action of the second piston 802, the gas ejected from the second nozzle 807 not only further cleans the surface to be measured, but also specially maintains the dustproof net 413 on the first nozzle 412, thereby doubly ensuring the cleanliness of the measurement environment.

[0049] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A motor rotor outer diameter measuring device, characterized in that: The invention comprises a column (101) and a base (100), wherein the base (100) is provided with a clamping assembly for a motor rotor, a lifting platform (102) is slidably provided on the column (101), a driving unit (103) for driving the lifting platform (102) to move is provided on the column (101), a rotating platform (200) is rotatably provided at the bottom of the lifting platform (102), a supporting rod (201) is connected to the side of the rotating platform (200), a rotating plate (202) is connected to the bottom of the supporting rod (201), and the bottom of the rotating plate (202) is connected to A fixing plate (203) is provided, a guide member (104) is provided on the base (100), a slot (208) is provided on the fixing plate (203), the guide member (104) is inserted into the slot (208) to limit the rotation of the fixing plate (203), an annular guide rail a (204) and an annular guide rail b (205) are longitudinally connected to the support rod (201) in sequence, two groups of outer diameter detection parts are connected to the annular guide rail a (204) and the annular guide rail b (205), and a positioning ring (2051) is connected between the two groups of outer diameter detection parts; The outer diameter detection unit comprises a slider (300), the number of the sliders (300) is two, the positioning ring (2051) is connected between the two sliders (300), the slider (300) is used for sliding connection on the annular guide rail a (204) and the annular guide rail b (205), the slider (300) is connected to a support (301), the support (301) is slidably connected to the slider (304), the bottom of the support (301) is connected to a cylinder (302), the output end of the cylinder (302) is provided with a connecting plate (303), a first push rod (305) is connected between the slider (304) and the connecting plate (303), the top of the slider (304) is connected to two support plates (306), the support plate (306) is slidably connected to a slide rod (400), the slide rod (400) ) is connected to a second baffle (407), a first spring (408) is sleeved on the slide bar (400), two ends of the first spring (408) are respectively against the second baffle (407) and the support plate (306), one end of the slide bar (400) is connected to the first baffle (401), and the other end is connected to the detection head (600), a displacement sensor (500) is connected to the support (301), the output end of the displacement sensor (500) is connected to the first detection unit (501), and the bottom of the slide bar (400) is connected to the second detection unit (502), when the cylinder (302) shrinks to the limit position and the first baffle (401) and the support plate (306) are in contact, the distance measured by the displacement sensor (500) is in an initial state, and the detection head (600) is tangent to the test axis; The slide bar (400) is provided with a first sealed cavity (402) and a slide cavity (403). The first sealed cavity (402) is sealed and slidably connected with a first piston (405). The first piston (405) is connected with a guide rod (404). The guide rod (404) passes through the slide bar (400) and extends toward the detection end. The guide rod (404) is sleeved with a third baffle (409). The third baffle (409) is slidably arranged in the slide cavity (403). The guide rod (404) is sleeved with a third baffle (409). two springs (410), the two ends of the second spring (410) respectively abut against the third baffle (409) and the inner side of the sliding cavity (403), a first channel (406) is provided in the guide rod (404), a first nozzle (412) is provided at the end of the guide rod (404) in the detection direction, a dustproof net (413) is provided on the first nozzle (412), a first one-way valve (411) is provided in the first channel (406), and a second one-way valve (4110) is provided outside the first sealing cavity (402); The detection end of the slide bar (400) is in an open state. The detection head (600) is connected to the port of the slide bar (400) by screws. The detection head (600) is sleeved with a first sleeve (700) on the outside. The first sleeve (700) is connected to the detection head (600) by bolts. A guide assembly is provided on the first sleeve (700). The guide assembly is used to locate the detection position of the detection head (600) and clean the surface of the motor rotor and the end of the guide bar (404).

2. The motor rotor outer diameter measuring device according to claim 1, characterized in that: The end of the detection head (600) is embedded in an elastic ring piece (601), a through hole is opened in the middle of the elastic ring piece (601), the guide rod (404) passes through the through hole, and a plurality of protrusions (602) are provided on the surface of the guide rod (404), and the plurality of protrusions (602) pass through the through hole and contact the elastic ring piece (601) to generate vibration.

3. The motor rotor outer diameter measuring device according to claim 1, characterized in that: The guide assembly includes a second sleeve (800) sleeved on the outside of the first sleeve (700), a second sealing cavity (701) is provided on the first sleeve (700), a second push rod (801) is connected to the inner side of the second sleeve (800), the second push rod (801) is inserted into the second sealing cavity (701), the end of the second push rod (801) away from the second sleeve (800) is connected to a second piston (802), a blocking member (805) is connected to the inner side of the second sealing cavity (701), a third spring (804) is sleeved on the second push rod (801), and the two ends of the third spring (804) are respectively against the second sleeve (800) and the blocking member (805).

4. The motor rotor outer diameter measuring device according to claim 3, characterized in that: A second channel (806) is provided in the second push rod (801), an inclined second nozzle (807) is provided on the inner side of the second sleeve (800), the second channel (806) is communicated with the second nozzle (807), a fourth one-way valve (803) is provided in the second channel (806), and a third one-way valve (702) is provided on the second sealed cavity (701).

5. The motor rotor outer diameter measuring device according to claim 1, characterized in that: The clamping assembly includes a screw rod (900) installed in the base (100), the screw rod (900) is provided with threads at two opposite ends, the base (100) is provided with a through groove (105), two symmetrical clamping plates (902) are slidably connected to the base (100), a clamping block (903) is provided on the inner side of the clamping plate (902), the lower end of the clamping plate (902) is respectively connected to the two ends of the screw rod (900) by threads, the screw rod (900) passes through the base (100) and extends to the outside, and the extended end of the screw rod (900) is connected to a knob (901).

6. The motor rotor outer diameter measuring device according to claim 1, characterized in that: The fixed plate (203) is provided with a dial (206), the rotating plate (202) is sleeved outside the dial (206) without contacting each other, and the rotating plate (202) is provided with a locking member (207) with a pointer.

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