Vernier caliper device with correction function and detection method

Abstract

The invention discloses a vernier caliper device with a correction function and a detection method, and mainly relates to the technical field of measurement tool control. Comprising a control unit, a function switch, a voice broadcaster, a first tilt angle sensor, a second tilt angle sensor, a third tilt angle sensor, an in-place switch, a Hall sensor, a vernier scale locking device and a storage battery which are installed on a vernier caliper. The function switch, the voice broadcaster, the first tilt angle sensor, the second tilt angle sensor, the third tilt angle sensor, the in-place switch and the Hall sensor are all in signal connection with the control unit. According to the invention, correction can be provided for a beginner using a vernier caliper for measurement, the measurement precision is improved, and the learning speed of the beginner is accelerated.

Description

Technical Field

[0001] The invention relates to the technical field of measuring tool control, in particular to a vernier caliper device with a correction function and a detection method. Background Art

[0002] A vernier caliper is a measuring tool for measuring length, inner and outer diameters, and depth. The main scale and vernier of the vernier caliper have two pairs of movable jaws, namely the inner measuring jaw and the outer measuring jaw. The inner measuring jaw is usually used to measure the inner diameter, the outer measuring jaw is usually used to measure the length and outer diameter, and the depth gauge is usually used to measure the depth. Generally, for beginners, there are large errors in measurement accuracy and readings. For example, when the vernier caliper uses the inner and outer measuring jaws for measurement, if the positions are not standard, it will cause inaccurate readings. After the vernier caliper is measured, the operator needs to remove the vernier caliper from the measuring part to read the reading. If the locking worm gear is not locked, it may cause the vernier to move, resulting in incorrect measurement results due to errors. Summary of the invention

[0003] The purpose of the present invention is to solve the problems existing in the prior art and to provide a vernier caliper device and a detection method with a corrective function, which can provide correction for beginners using a vernier caliper for measurement, improve the measurement accuracy, and speed up the learning speed of beginners.

[0004] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0005] A vernier caliper device with a corrective function, comprising a control unit, a function switch, a voice announcer, a first inclination sensor, a second inclination sensor, a third inclination sensor, an in-position switch, a Hall sensor, a vernier ruler locking device, and a battery installed on the vernier caliper; the first inclination sensor is installed on the top of the vernier ruler of the vernier caliper, and is used to detect the horizontal inclination angle of the outer measuring claw or the inner measuring claw relative to the position of the measuring component during the measurement process of the vernier caliper; the second inclination sensor is installed on the head of the main ruler of the vernier caliper, and is used to detect the vertical horizontal inclination angle of the outer measuring claw or the inner measuring claw relative to the position of the measuring component during the measurement process of the vernier caliper; the third inclination sensor is installed on the vernier ruler of the vernier caliper The bottom of the vernier caliper is used to detect the vertical and horizontal inclination angle of the depth gauge relative to the measuring component during the measurement process of the vernier caliper; the vernier caliper locking device includes a worm and a locking worm wheel meshing with the worm, and a threaded hole penetrating the outer wall of the vernier caliper and adapted to the worm is provided at the top of the vernier caliper; the locking worm wheel is connected to the rotating component of the Hall sensor through a rotating shaft, and the Hall sensor is used to detect the rotation direction of the locking worm wheel; the in-place switch is installed above the worm, and is used to detect whether the locking worm wheel of the vernier caliper is locked in place, and is a normally open switch; the function switch, the voice announcer, the first inclination sensor, the second inclination sensor, the third inclination sensor, the in-place switch, and the Hall sensor are all connected to the control unit signal.

[0006] A correction detection method for a vernier caliper device having a correction function, comprising: turning on a function switch;

[0007] When measuring the length or inner and outer diameters of a component, first rotate the locking worm gear clockwise to loosen the vernier ruler. The in-place switch is closed by the pressure of the worm rotating counterclockwise and moving upward. The rotating component of the Hall sensor generates a high potential signal in the direction of loosening the vernier ruler under the drive of the locking worm gear. At this time, the high potential of the Hall sensor and the signal of the closed in-place switch are transmitted to the control unit, and the control unit controls the voice announcer not to alarm.

[0008] Place the outer measuring claw or the inner measuring claw of the vernier caliper on the detection position of the component to be measured, the first inclination sensor transmits the horizontal signal of the vernier caliper relative to the measurement component to the control unit, and the second inclination sensor transmits the vertical signal of the vernier caliper relative to the measurement component to the control unit; if the detected signal does not exceed the set range, the control unit controls the voice announcer not to give a voice alarm; if the detected signal exceeds the set range, the control unit controls the voice announcer to give an alarm for warning and correction;

[0009] After the detection is completed, the locking worm gear of the vernier caliper is locked first. If the locking worm gear is forgotten to be locked, the control unit controls the voice announcer to issue a voice alarm "the locking worm gear is forgotten to be locked"; if the locking worm gear rotates counterclockwise to drive the worm to rotate clockwise to move the locking vernier ruler downward, but it is not locked in place, resulting in the in-place switch contact arm being compressed by the worm and continuing to close, the rotating part of the Hall sensor generates a low-potential signal in the direction of loosening the vernier ruler under the drive of the locking worm gear. At this time, the low potential of the Hall sensor and the signal of the closed in-place switch are transmitted to the control unit, and the control unit controls the voice announcer to issue a voice alarm "the locking worm gear is not locked in place"; if the vernier ruler is locked in place, the control unit determines that the locking worm gear is locked in place and controls the voice announcer not to issue a voice alarm;

[0010] When measuring the depth of a component, first loosen the vernier ruler. The in-position switch is closed by the pressure of the worm rotating counterclockwise and moving upward. The rotating component of the Hall sensor generates a high potential signal in the direction of loosening the vernier ruler under the drive of the locking worm gear. At this time, the high potential of the Hall sensor and the signal of the closed in-position switch are transmitted to the control unit, and the control unit controls the voice announcer not to alarm.

[0011] When measuring the depth, put the depth gauge of the vernier caliper on the detection position of the measuring component, and the third inclination sensor transmits the vertical and horizontal signals of the vernier caliper relative to the measuring component to the control unit; if the detected signal does not exceed the set range, the control unit controls the voice announcer not to give a voice alarm; if the detected signal exceeds the set range, the control unit controls the voice announcer to give an alarm to warn and correct "the vertical and horizontal inclination angles do not meet the requirements";

[0012] After the detection is completed, the locking worm gear of the vernier caliper is locked first. If the locking worm gear is forgotten to be locked, the Hall sensor continues to transmit the high potential in the direction of loosening the vernier scale and the signal of closing the in-place switch to the control unit, and the control unit controls the voice announcer to issue a voice alarm "the locking worm gear is forgotten to be locked"; if the locking worm gear is not locked in place, the contact arm of the in-place switch is still compressed by the worm and continues to be closed, and the rotating part of the Hall sensor generates a low potential signal in the direction of loosening the vernier scale under the drive of the locking worm gear. At this time, the control unit controls the voice announcer to issue a voice alarm "the locking worm gear is not locked in place"; if the vernier scale is locked in place, the control unit determines that the locking worm gear is locked in place and controls the voice announcer not to issue a voice alarm.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] The present invention determines the position of the vernier caliper relative to the measuring component through the signals detected by three inclination sensors, and if the detection signal exceeds the set range, an alarm will be issued for correction; after the detection, it is determined whether the locking worm gear is locked through the signals detected by the in-place switch and the Hall sensor, and the control unit will determine whether to issue a voice alarm through the voice announcer according to the signals detected by the in-place switch and the Hall sensor; it can make it easier for beginners to master the operating essentials, is convenient to operate, does not affect the use of the original vernier caliper, only increases the auxiliary function, can ensure the measurement accuracy, and speed up the learning speed of beginners. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the present invention;

[0016] Figure 2 It is the control principle diagram of the present invention.

[0017] The numbers shown in the accompanying drawings are: 1. first inclination sensor; 2. second inclination sensor; 3. third inclination sensor; 4. in-position switch; 5. Hall sensor; 6. vernier scale; 7. outer measuring jaw; 8. inner measuring jaw; 9. main scale; 10. worm; 11. locking worm wheel; 12. depth gauge. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the application equally.

[0019] Embodiment 1: As attached Figure 1-2 As shown, the present invention is a vernier caliper device with a corrective effect, comprising:

[0020] 1) Control unit

[0021] For automatic control, mounted on a vernier caliper device.

[0022] 2) Function switch

[0023] Used to determine whether the device is enabled or disabled, installed on the vernier caliper device.

[0024] 3) Voice announcer

[0025] Used for voice broadcast warning, installed on the vernier caliper device.

[0026] 4) First inclination sensor 1

[0027] It is used to detect the horizontal inclination angle of the outer measuring claw 7 or the inner measuring claw 8 relative to the position of the measuring part during the measurement process of the vernier caliper device, to ensure that the horizontal inclination of the vernier caliper device relative to the measuring part is not too large, to prevent the outer measuring claw 7 or the inner measuring claw 8 from contacting the measured part in a position that does not meet the requirements. It has a base to adjust the initial signal parameters of the first inclination sensor 1, and the first inclination sensor 1 is installed on the top of the vernier scale 6 of the vernier caliper.

[0028] 5) Second inclination sensor 2

[0029] It is used to detect the vertical and horizontal inclination angle of the outer measuring claw 7 or the inner measuring claw 8 relative to the position of the measuring part during the measurement process of the vernier caliper device, to ensure that the vertical and horizontal inclination of the vernier caliper device relative to the measuring part is not too large, to prevent the outer measuring claw 7 or the inner measuring claw 8 from contacting the measured part in a position that does not meet the requirements. It has a base to adjust the initial signal parameters of the inclination sensor, and the second inclination sensor 2 is installed at the head of the main scale 9 of the vernier caliper.

[0030] 6) The third inclination sensor 3

[0031] It is used to detect the vertical and horizontal inclination angle of the depth gauge relative to the measuring part during the measurement process of the vernier caliper device, to ensure that the vertical and horizontal inclination of the vernier caliper device relative to the measuring part is not too large, to prevent the contact position of the depth gauge 12 with the measured part from not meeting the requirements. It has a base to adjust the initial signal parameters of the inclination sensor, and the third inclination sensor 3 is installed at the bottom of the vernier scale 6 of the vernier caliper.

[0032] 7) In-position switch 4

[0033] The in-place switch 4 is used to detect whether the locking worm wheel 11 of the vernier caliper is locked in place. It is a normally open switch installed on the vernier caliper device. If the locking worm wheel 11 is not locked in place, the vernier scale 6 may move, resulting in inaccurate measurement results. When the locking worm wheel 11 rotates counterclockwise, it drives the worm 10 to rotate clockwise and move downward, the vernier scale 6 is locked, and at the same time, the in-place switch 4 is not compressed and disconnected, and the disconnection signal is transmitted to the control unit; when the locking worm wheel 11 rotates clockwise, it drives the worm 10 to rotate counterclockwise and move upward, the vernier scale 6 is not locked, and at the same time, the in-place switch 4 is compressed and closed, and the closing signal is transmitted to the control unit.

[0034] 8) Hall sensor 5

[0035] The locking worm wheel 11 used to detect whether the vernier caliper is locking or releasing the rotation direction is installed on the vernier caliper device. The rotating part of the Hall sensor 5 is connected to the locking worm wheel 11 through a rotating shaft. When the locking worm wheel 11 rotates counterclockwise, it drives the worm 10 to rotate clockwise and move downward, that is, the vernier scale 6 is locked, and the signal of the Hall sensor 5 is at a low potential, and the signal is transmitted to the control unit; when the locking worm wheel 11 rotates clockwise, it drives the worm 10 to rotate counterclockwise and move upward, the vernier scale 6 is not locked but released, and the signal of the Hall sensor 5 is at a high potential, and the signal is transmitted to the control unit. If the function switch is turned on, the vernier caliper device works, the locking worm wheel 11 rotates clockwise, and the vernier scale 6 is released. After a period of time, it is still not locked. The control unit determines that the locking worm wheel 11 has forgotten to be locked and controls the voice announcer to alarm.

[0036] 9) Vernier scale locking device

[0037] It is used to lock the vernier scale 6, mainly including a locking worm wheel 11 and a worm 10. The locking worm wheel 11 is connected to the rotating part of the Hall sensor 5 through a rotating shaft; the upper end of the worm 10 can compress or release the contact arm of the in-place switch as it moves up or down, so that the in-place switch 4 is closed or opened; the lower end of the worm 10 is connected to the vernier scale 6 through a threaded connection, and when the worm 10 rotates and moves downward, it can support the main scale 9, thereby locking the vernier scale 6 relative to the main scale 9.

[0038] 10) Battery

[0039] Used to power the vernier caliper device and installed on the vernier caliper device.

[0040] When the device is used to measure length or inner and outer diameters, the control unit determines the position of the outer measuring claw 7 or the inner measuring claw 8 of the vernier caliper device relative to the measuring component, that is, the horizontal and vertical inclination angles, according to the signals detected by the first inclination sensor 1 and the second inclination sensor 2. If the detected signal exceeds the set range, the voice announcer will be controlled to alarm for warning and correction; when measuring depth, the control unit determines the position of the depth gauge 12 of the vernier caliper device relative to the measuring component, that is, the vertical inclination angle, according to the signal detected by the third inclination sensor 3. If the detected signal exceeds the set range, the voice announcer will be controlled to alarm for warning and correction; whether it is detecting length or inner and outer diameters, or detecting depth, after the detection is completed, whether the locking worm gear 11 is locked, the control unit will determine whether to issue a voice announcer voice alarm according to the signals detected by the in-place switch 4 and the Hall sensor 5; this makes it easier for beginners to master the operating essentials and the accuracy of vernier caliper measurement is also improved.

[0041] Embodiment 2: The present invention is a correction detection method for a vernier caliper device having a correction function, comprising:

[0042] Turn on the function switch to make the vernier caliper device work:

[0043] 1) When measuring the length or inner and outer diameters of a component, first rotate the locking worm wheel 11 clockwise to loosen the vernier scale 6. The in-place switch 4 is closed by the pressure of the worm 10 rotating counterclockwise and moving upward. The rotating part of the Hall sensor 5 generates a high potential signal in the direction of loosening the vernier scale 6 under the drive of the locking worm wheel 11. At this time, the high potential of the Hall sensor 5 and the signal of the closing of the in-place switch 4 are transmitted to the control unit, and the control unit controls the voice announcer not to alarm.

[0044] Place the outer measuring claw 7 or the inner measuring claw 8 of the vernier caliper device on the detection position of the measuring component, the first inclination sensor 1 transmits the lateral level signal of the vernier caliper device relative to the measuring component to the control unit, and the second inclination sensor 2 transmits the longitudinal level signal of the vernier caliper device relative to the measuring component to the control unit; if the detected signal does not exceed the set range, it means that the lateral and longitudinal vertical measurement angles of the vernier caliper device are correct relative to the detection position of the measuring component, and the control unit controls the voice announcer not to give a voice alarm; if the detected signal exceeds the set range, it means that the lateral and vertical measurement angles of the vernier caliper device do not meet the requirements relative to the detection position of the measuring component, and the control unit controls the voice announcer to give an alarm to warn and correct "the lateral inclination angle does not meet the requirements", "the longitudinal inclination angle does not meet the requirements" or "both the lateral and longitudinal inclination angles do not meet the requirements".

[0045] When the test is completed and reading is required, the locking worm gear 11 of the vernier caliper device must be locked, otherwise the vernier scale 6 may move, resulting in inaccurate measurement readings. If the locking worm gear 11 is forgotten to be locked, the Hall sensor 5 continues to transmit the high potential in the direction of loosening the vernier scale 6 and the signal of the closing of the in-position switch 4 to the control unit. After a period of time, the control unit determines that the locking worm gear 11 is forgotten to be locked and the vernier scale 6 may move, causing an error and controlling the voice announcer to issue a voice alarm "the locking worm gear is forgotten to be locked". If the locking worm wheel 11 rotates counterclockwise to drive the worm 10 to rotate clockwise and move the locking vernier 6 downward, but it is not locked in place, the contact arm of the in-place switch 4 is still compressed by the worm 10 and continues to close. The rotating part of the Hall sensor 5 generates a low potential signal in the direction of loosening the vernier 6 under the drive of the locking worm wheel 11. At this time, the low potential of the Hall sensor 5 and the signal of the closing of the in-place switch 4 are transmitted to the control unit. The control unit determines that the locking worm wheel 11 is not locked in place and may cause the vernier 6 to move, causing an error and controlling the voice announcer to issue a voice alarm "The locking worm wheel is not locked in place". If the locking worm wheel 11 rotates counterclockwise to drive the worm 10 to rotate clockwise and move the locking vernier 6 downward, the vernier 6 is locked in place, and the contact arm of the in-place switch 4 is not compressed by the worm 10 and is disconnected. The Hall sensor 5 transmits the low potential of the locking rotation direction of the vernier 6 and the signal of the disconnection of the in-place switch 4 to the control unit. The control unit determines that the locking worm wheel 11 is locked in place and controls the voice announcer not to issue a voice alarm.

[0046] 2) When measuring the depth of a component, first rotate the locking worm wheel 11 clockwise to loosen the vernier scale 6. The in-position switch 4 is closed by the pressure of the counterclockwise rotating worm 10 moving upward. The rotating component of the Hall sensor 5 generates a high potential signal in the direction of loosening the vernier scale 6 under the drive of the locking worm wheel 11. At this time, the high potential of the Hall sensor 5 and the signal of the closing of the in-position switch 4 are transmitted to the control unit, and the control unit controls the voice announcer not to alarm.

[0047] When measuring the depth, the depth gauge 12 of the vernier caliper is placed on the detection position of the measuring component, and the third inclination sensor 3 transmits the vertical and horizontal signal of the vernier caliper device relative to the measuring component to the control unit; if the detected signal does not exceed the set range, it means that the vertical and horizontal measurement angle of the vernier caliper device is correct relative to the detection position of the measuring component, and the control unit controls the voice announcer not to issue a voice alarm; if the detected signal exceeds the set range, it means that the vertical and horizontal measurement angle of the vernier caliper device relative to the detection position of the measuring component does not meet the requirements, and the control unit controls the voice announcer to alarm to warn and correct "the vertical and horizontal inclination angle does not meet the requirements".

[0048] When the test is completed and reading is required, the locking worm gear 11 of the vernier caliper device must be locked, otherwise the vernier scale 6 may move, resulting in inaccurate measurement readings. If the locking worm gear 11 is forgotten to be locked, the Hall sensor 5 continues to transmit the high potential in the direction of loosening the vernier scale 6 and the signal of the closing of the in-position switch 4 to the control unit. After a period of time, the control unit determines that the locking worm gear 11 is forgotten to be locked and the vernier scale may move, causing an error and controlling the voice announcer to issue a voice alarm "the locking worm gear is forgotten to be locked". If the locking worm wheel 11 rotates counterclockwise to drive the worm 10 to rotate clockwise and move the locking vernier 6 downward, but it is not locked in place, the contact arm of the in-place switch 4 is still compressed by the worm 10 and continues to close. The rotating part of the Hall sensor 5 generates a low potential signal in the direction of loosening the vernier 6 under the drive of the locking worm wheel 11. At this time, the low potential of the Hall sensor 5 and the signal of the closing of the in-place switch 4 are transmitted to the control unit. The control unit determines that the locking worm wheel 11 is not locked in place and may cause the vernier 6 to move, causing an error and controlling the voice announcer to issue a voice alarm "The locking worm wheel is not locked in place". If the locking worm wheel 11 rotates counterclockwise to drive the worm 10 to rotate clockwise and move the locking vernier downward, the vernier 6 is locked in place, and the contact arm of the in-place switch 4 is not compressed by the worm 10 and is disconnected. The Hall sensor 5 transmits the low potential of the locking rotation direction of the vernier 6 and the signal of the disconnection of the in-place switch 4 to the control unit. The control unit determines that the locking worm wheel 11 is locked in place and controls the voice announcer not to issue a voice alarm.

[0049] 3) The measuring method and steps of the present invention are basically the same as those of the original vernier caliper, except that the correction function is added. After measuring a set of values, the following measurement exercises can be continued according to the above steps and operating instructions. In this way, the automatic detection and correction function of the vernier caliper device can avoid the phenomenon of inaccurate detection values ​​caused by beginners' poor grasp of operating instructions, and also speed up the learning speed of beginners to a certain extent.

Claims

1. A vernier caliper device with a corrective effect, characterized in that: The invention comprises a control unit, a function switch, a voice announcer, a first inclination sensor (1), a second inclination sensor (2), a third inclination sensor (3), an in-position switch (4), a Hall sensor (5), a vernier ruler locking device, and a battery; the first inclination sensor (1) is installed on the top of the vernier ruler (6) of the vernier caliper, and is used to detect the horizontal inclination angle of the outer measuring claw (7) or the inner measuring claw (8) relative to the position of the measuring component during the measurement process of the vernier caliper; the second inclination sensor (2) is installed on the head of the main scale (9) of the vernier caliper, and is used to detect the vertical horizontal inclination angle of the outer measuring claw (7) or the inner measuring claw (8) relative to the position of the measuring component during the measurement process of the vernier caliper; the third inclination sensor (3) is installed on the bottom of the vernier ruler (6) of the vernier caliper, and is used to detect the vertical horizontal inclination angle of the outer measuring claw (7) or the inner measuring claw (8) relative to the position of the measuring component during the measurement process of the vernier caliper. The invention relates to a depth gauge and a vernier caliper. The invention relates to a depth gauge and a vernier caliper. The invention relates to a depth gauge and a vernier caliper. The vernier caliper is provided with a vernier caliper locking device. The vernier caliper locking device comprises a worm (10) and a locking worm wheel (11) meshed with the worm (10). A threaded hole penetrating the outer wall of the vernier caliper (6) and adapted to the worm (10) is provided at the top of the vernier caliper. The locking worm wheel (11) is connected to a rotating part of a Hall sensor (5) via a rotating shaft. The Hall sensor (5) is used to detect the rotation direction of the locking worm wheel (11). The in-position switch (4) is installed above the worm (10) and is used to detect whether the locking worm wheel (11) of the vernier caliper is locked in place. The in-position switch (4) is a normally disconnected switch. The function switch, the voice announcer, the first inclination sensor (1), the second inclination sensor (2), the third inclination sensor (3), the in-position switch (4) and the Hall sensor (5) are all connected to the control unit signal.

2. The correction detection method of a vernier caliper device with a correction function according to claim 1, characterized in that: include: Turn on the function switch; When measuring the length or inner and outer diameters of a component, the locking worm wheel (11) is first rotated clockwise to loosen the vernier ruler (6). The in-position switch (4) is closed by the pressure of the worm (10) rotating counterclockwise and moving upward. The rotating component of the Hall sensor (5) generates a high potential signal in the direction of loosening the vernier ruler (6) under the drive of the locking worm wheel (11). At this time, the high potential of the Hall sensor (5) and the signal of the closing of the in-position switch (4) are transmitted to the control unit, and the control unit controls the voice announcer not to alarm. The outer measuring claw (7) or the inner measuring claw (8) of the vernier caliper is placed at the detection position of the component to be measured, the first inclination sensor (1) transmits a horizontal signal of the vernier caliper relative to the measured component to the control unit, and the second inclination sensor (2) transmits a vertical signal of the vernier caliper relative to the measured component to the control unit; if the detected signal does not exceed the set range, the control unit controls the voice announcer not to sound a voice alarm; if the detected signal exceeds the set range, the control unit controls the voice announcer to sound an alarm for warning and correction; After the detection is completed, the locking worm wheel (11) of the vernier caliper is first locked. If the locking worm wheel (11) is forgotten to be locked, the control unit controls the voice announcer to issue a voice alarm "the locking worm wheel is forgotten to be locked"; if the locking worm wheel (11) rotates counterclockwise to drive the worm (10) to rotate clockwise to move the locking vernier scale (6) downward, but it is not locked in place, resulting in the contact arm of the in-place switch (4) being compressed by the worm (10) and continuing to close, the rotating part of the Hall sensor (5) generates a low potential signal in the direction of loosening the vernier scale (6) under the drive of the locking worm wheel (11). At this time, the low potential of the Hall sensor (5) and the signal of the closing of the in-place switch are transmitted to the control unit, and the control unit controls the voice announcer to issue a voice alarm "the locking worm wheel is not locked in place"; if the vernier scale (6) is locked in place, the control unit determines that the locking worm wheel (11) is locked in place and controls the voice announcer not to issue a voice alarm; When measuring the depth of a component, the vernier ruler (6) is first loosened, and the in-position switch (4) is closed by the pressure of the worm (10) rotating counterclockwise and moving upward. The rotating component of the Hall sensor (5) generates a high potential signal in the direction of loosening the vernier ruler (6) under the drive of the locking worm gear (11). At this time, the high potential of the Hall sensor (5) and the signal of the closing of the in-position switch (4) are transmitted to the control unit, and the control unit controls the voice announcer not to alarm. When measuring the depth, the depth gauge (12) of the vernier caliper is placed on the detection position of the measuring component, and the third inclination sensor (3) transmits the vertical and horizontal signals of the vernier caliper relative to the measuring component to the control unit; if the detected signal does not exceed the set range, the control unit controls the voice announcer not to give a voice alarm; if the detected signal exceeds the set range, the control unit controls the voice announcer to give an alarm to warn and correct that "the vertical and horizontal inclination angles do not meet the requirements"; After the detection is completed, the locking worm wheel (11) of the vernier caliper is first locked. If the locking worm wheel (11) is forgotten to be locked, the Hall sensor (5) continues to transmit the high potential in the direction of the vernier scale loosening and the signal of the in-place switch closing to the control unit, and the control unit controls the voice announcer to issue a voice alarm "the locking worm wheel is forgotten to be locked"; if the locking worm wheel (11) is not locked in place, the contact arm of the in-place switch (4) is still compressed by the worm (10) and continues to be closed, and the rotating part of the Hall sensor (5) generates a low potential signal in the direction of the vernier scale loosening under the drive of the locking worm wheel (11), and at this time the control unit controls the voice announcer to issue a voice alarm "the locking worm wheel is not locked in place"; if the vernier scale (6) is locked in place, the control unit determines that the locking worm wheel is locked in place and controls the voice announcer not to issue a voice alarm.

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