Non-contact gap in-situ measurement device, measurement method and calculation method

Abstract

The invention discloses a non-contact gap in-situ measurement device, a measurement method and a calculation method, the gap in-situ measurement device comprises a main body, a differential ruler and a reset assembly, and the main body is provided with a guide channel; the foot hooking assembly is movably arranged in the guide channel and abuts against the front end of the differential ruler, and the differential ruler drives the foot hooking assembly to move along the guide channel, so that the front end of the foot hooking assembly is opened after the foot hooking assembly extends out of the main body; the reset assembly is connected to the hook foot assembly, and the front end of the hook foot assembly is folded through elastic acting force and retreats to enter the body. Through cooperation of the differential ruler and the hook foot assembly, accurate positioning of the bottom of the blind hole can be achieved, and complex equipment is not needed; the problem that the distance from the outer surface to the inner surface of the shell is difficult to measure due to a blind area in a traditional method is effectively solved; the device is suitable for the measurement requirements of different types of cases, has good universality and expansibility, and does not need to dismount or damage the structure of the case.

Description

Technical Field

[0001] This invention relates to the field of rotating machinery measurement, and more particularly to a non-contact in-situ gap measurement device, measurement method, and calculation method. Background Technology

[0002] Rotating machinery, as a key device for converting thermal energy into mechanical energy, relies heavily on the proper coordination between its internal flowing and stationary components for its operational efficiency and safety. Among these, the target object clearance (i.e., the clearance between the blade tip and the inner wall of the casing) is one of the key parameters affecting the aerodynamic performance, efficiency, and long-term operational stability of rotating machinery.

[0003] During the actual operation of rotating machinery, the blade tip clearance changes dynamically with varying operating conditions due to factors such as thermal expansion, centrifugal force, and vibration. Accurately acquiring real-time data on blade tip clearance is crucial for assessing the safety of rotating machinery, optimizing structural design, and improving operational efficiency.

[0004] Currently, commonly used methods for measuring blade tip clearance in rotating machinery testing and research mainly include capacitive sensor methods, eddy current sensor methods, and laser ranging methods. These methods typically require drilling a measurement hole in the casing and installing a sensor probe into the hole to detect the blade tip clearance. However, in practical operation, especially under blind hole conditions (blind holes are through holes or stepped holes that are inherent to the casing itself), traditional measurement methods have the following problems: Measurement is difficult: The bottom area of ​​the blind hole is a typical "blind zone" or "black box" structure with a small internal space, making it impossible to directly contact or observe it through conventional means (such as laser ranging, optical imaging, manual measurement, etc.). This makes it difficult to accurately obtain the distance from the outer surface of the casing to the inner surface (in other words, the depth of the blind hole or the wall thickness of the casing).

[0005] High non-destructive requirements: Traditional methods usually require opening through-holes in the casing for measurement, which not only increases the risk of structural damage but may also affect the normal operation of rotating machinery.

[0006] Insufficient measurement accuracy: Existing methods are difficult to implement in-situ measurements under blind hole conditions, especially in measuring the shrinkage value of the blade tip clearance. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide a non-contact in-situ gap measurement device, measurement method and calculation method.

[0008] The technical solution adopted by this invention to solve its technical problem is: A non-contact in-situ gap measurement device, comprising: The main body is equipped with a guide passageway; Differential ruler; A hook-foot assembly is movably disposed within the guide channel and abuts against the front end of the micrometer. The micrometer drives the hook-foot assembly to move along the guide channel, causing the front end of the hook-foot assembly to open after it extends out of the main body. A reset component is connected to the hook component, which uses an elastic force to close the front end of the hook component and retract it into the main body.

[0009] Furthermore, in the aforementioned non-contact in-situ gap measuring device, the hook assembly preferably includes a displacement measuring component movably disposed within the guide channel and at least one chuck movably disposed at the front end of the displacement measuring component; the at least one chuck abuts against the front end of the micrometer to drive the at least one chuck, so that after the displacement measuring component moves along the guide channel and extends out of the main body, the at least one chuck moves from inside the displacement measuring component to outside the displacement measuring component.

[0010] Furthermore, in the aforementioned non-contact in-situ gap measurement device, the displacement measurement component preferably includes a mounting base, the mounting base having a receiving cavity, the chuck including a body movably disposed within the receiving cavity and a locking portion disposed at one end of the body, the micrometer driving the body forward and causing the locking portion to move from inside the displacement measurement component to outside the displacement measurement component.

[0011] Furthermore, in the aforementioned non-contact in-situ gap measuring device, the displacement measuring component preferably further includes a positioning element installed on the cavity wall of the receiving cavity, and the positioning element is perpendicular to the axis of the main body; the positioning element passes through the jaw.

[0012] Furthermore, in the aforementioned non-contact in-situ gap measuring device, the displacement measuring component preferably further includes a support member mounted on the mounting base. The support member includes at least one sliding groove perpendicular to the axis of the main body, and the chuck further includes a sliding portion disposed at the other end of the main body, the sliding portion being slidably disposed within the sliding groove.

[0013] Furthermore, in the aforementioned non-contact in-situ gap measuring device, the displacement measuring component preferably further includes a base, the base including a tube and at least one limiting block disposed on the tube; the tube is slidably disposed within the guide channel; the inner wall of the guide channel is provided with at least one limiting groove, which is parallel to the axis of the guide channel, and the limiting block is slidably installed within the limiting groove.

[0014] Furthermore, in the aforementioned non-contact in-situ gap measuring device, the reset component preferably includes a first elastic element disposed between the jaw and the mounting base.

[0015] Furthermore, in the aforementioned non-contact in-situ gap measuring device, the reset assembly preferably further includes a second elastic element disposed between the base and the end of the main body near the micrometer.

[0016] Furthermore, in the aforementioned non-contact in-situ gap measuring device, the jaw preferably includes a driving surface disposed on the body, and the micrometer includes a micrometer screw and a driving part disposed on the micrometer screw. The driving part abuts against the driving surface so that after the hook assembly extends out of the body, the jaw moves from inside the displacement measuring assembly to outside the displacement measuring assembly.

[0017] Furthermore, in the aforementioned non-contact in-situ gap measuring device, preferably, three jaws are provided, and when the three jaws are closed, the driving surface forms an inward concave structure with a smaller inner surface and a larger outer surface.

[0018] A non-contact in-situ gap measurement method includes the following steps: S1, for a first blind hole and a second blind hole with different diameters that are connected to each other on the housing, the depth of the first blind hole is first measured using calipers; S2, insert the main body of the measuring device into the first blind hole, rotate the micrometer to drive the hook assembly, and the hook assembly extends forward into the second blind hole; S3, until the front end of the hook assembly loses the restriction of the second blind hole wall, the micrometer drives the front end of the hook assembly to open, so that the front end of the hook assembly hooks onto the inner wall of the housing, and reads the scale on the micrometer to measure the depth of the second blind hole. S4, the depth of the first blind hole plus the depth of the second blind hole is used to obtain the distance information from the outer surface to the inner surface of the housing; S5, establish a reference for the installation position based on the distance information, and install the sensor into the first blind hole and the second blind hole.

[0019] A non-contact in-situ gap measurement and calculation method for measuring the gap between the inner surface of a housing and a target object includes the following steps: S1, measuring the capacitance value between the sensor and the target object. The actual distance between the sensor and the target object is calculated using the following formula. , Where A is the area of ​​the capacitor plates of the sensor. It is the dielectric constant; S2, the distance between the inner surface of the computer housing and the sensor probe end, is calculated using the following formula. , ;in This is the distance between the outer surface and the inner surface of the casing. This is the distance between the sensor probe tip and the outer surface of the housing; S3, calculate the gap d between the target objects using the following formula, d .

[0020] The present invention has the following advantages: by combining the micrometer and the hook foot assembly, precise positioning of the bottom of the blind hole can be achieved without the need for complex equipment; it effectively solves the problem of difficulty in measuring the distance from the outer surface to the inner surface of the housing due to the blind zone in traditional methods; it is applicable to the measurement needs of different types of rotating machinery, has good versatility and expandability, and can quickly complete the measurement task on site without disassembling or damaging the rotating machinery structure. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings: Figure 1 This is a three-dimensional structural schematic diagram of the non-contact in-situ gap measuring device in some embodiments of the present invention; Figure 2 yes Figure 1 A cross-sectional schematic diagram of the non-contact in-situ gap measurement device shown. Figure 3 yes Figure 1 A three-dimensional structural diagram of the hook-foot assembly shown; Figure 4 yes Figure 3 A cross-sectional view of the hook-foot assembly shown. Figure 5 yes Figure 3 A three-dimensional exploded view of the hook-foot assembly shown. Figure 6 yes Figure 5 A three-dimensional exploded view of the hook-foot assembly from another perspective. Figure 7 yes Figure 5 A schematic diagram of the three-dimensional structure of the chuck shown; Figure 8 yes Figure 1 A schematic diagram of the three-dimensional structure of the main body shown; Figure 9 This is a three-dimensional structural diagram of the non-contact in-situ gap measuring device in use in some embodiments of the present invention; Figure 10 This is a schematic diagram of the sensor installation state structure for a non-contact in-situ gap calculation method. Detailed Implementation

[0022] To provide a clearer understanding of the technical features, objectives, and effects of this invention, specific embodiments are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "front," "rear," "upper," "lower," "left," "right," "longitudinal," "horizontal," "vertical," "horizontal," "top," "bottom," "inner," "outer," "head," and "tail" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing this technical solution and do not indicate that the device or element referred to must have a specific orientation; therefore, they should not be construed as limitations on this invention.

[0023] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "linking," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. When an component is referred to as being "on" or "below" another component, the component can be located "directly" or "indirectly" on the other component, or there may be one or more intermediary components. The terms "first," "second," "third," etc., are only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," "third," etc., may explicitly or implicitly include one or more of that feature. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0024] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the invention. However, those skilled in the art will understand that the invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the invention with unnecessary detail.

[0025] The technical solution adopted by this invention to solve its technical problem is: like Figures 1 to 2As shown, some embodiments of the present invention disclose a non-contact in-situ gap measurement device, method, and in-situ measurement calculation method. This non-contact in-situ gap measurement device measures the wall thickness of a housing through a blind hole (in other words, the depth of the blind hole). Of course, this in-situ gap measurement device is not limited to measuring the depth of blind holes in rotating machinery; it can also measure the hole depth on other devices, and its application is not limited in this context. In some embodiments, the in-situ gap measurement device may include a main body 10, a micrometer 20, a hook assembly 30, and a reset assembly 40. The main body 10 has a guide channel 12, the micrometer 20 is disposed at one end of the guide channel 12, and the hook assembly 30 is disposed within the guide channel 12. Driven by the micrometer 20, the hook assembly 30 moves along the guide channel 12, causing its front end to open after extending beyond the main body 10. The distance by which the hook assembly 30 extends beyond the main body 10 can be displayed on the scale of the micrometer 20. The reset component 40 is connected to the hook foot component 30. The micrometer 20 removes or reduces the drive on the hook foot component 30. The reset component 40 uses elastic force to close the front end of the hook foot component 30 and retract it into the main body 10.

[0026] Please refer to Figure 9 Understandably, the hook assembly 30 (or the guide channel 12 coaxial) is aligned with the blind hole, and the micrometer 20 is rotated to drive the hook assembly 30 to move into the blind hole along the guide channel 12. After the hook assembly 30 passes through the blind hole, the front end of the hook assembly 30 opens to hook onto the wall of the blind hole (the inner surface of the housing). At this time, the depth of the blind hole (the distance of the hook assembly 30 extending out of the main body 10) can be determined by reading the value on the micrometer 20, which provides reliable data support for the accurate measurement of the gap of the target object, especially the retraction value.

[0027] For reference Figure 8 In some embodiments, the main body 10 may include a cylindrical body 11, a guide channel 12, and at least one limiting groove 13. The cylindrical body 11 is a hollow structure forming the guide channel 12, and three limiting grooves 13 are provided on the inner wall of the guide channel 12. Understandably, the guide channel 12 and the three limiting grooves 13 guide the movement of the hook-foot assembly 30, preventing the hook-foot assembly 30 from deviating during movement.

[0028] In other embodiments, the main body 10 can also be a plate-like structure, and the guide channel 12 is a through groove provided on the plate-like main body 10 to allow the hook foot assembly 30 to slide within the through groove. Alternatively, in other embodiments, the guide channel 12 can be a guide rail / block structure, with the main body 10 and the hook foot assembly 30 connected via the guide rail / block structure. Or, the guide channel 12 can be a slider, with the hook foot assembly 30 slidably mounted on the main body 10 via the slider.

[0029] Continue to refer to Figure 1 and Figure 2 In some embodiments, the micrometer scale 20 may include a micrometer screw 21, a drive unit 22, a fixed sleeve 23, a micrometer cylinder 24, and a force measuring device 25. The drive unit 22 is located at the front end of the micrometer screw 21 and has a tapered structure to drive the aforementioned hook assembly 30. The micrometer screw 21 engages with the internal thread of the fixed sleeve 23, converting rotational motion into axial displacement. The micrometer cylinder 24 is fixed to the rear end of the micrometer screw 21 via a tapered fastener or screw, achieving synchronous rotation. When the micrometer cylinder 24 rotates one revolution, the micrometer screw 21 moves forward or backward. The force measuring device 25 is mounted at the tail end of the micrometer cylinder 24. The ratchet mechanism of the force measuring device 25 disengages from the transmission when a set torque threshold is reached, limiting the measuring force. The main scale of the fixed sleeve 23 and the circumferential scale of the micrometer cylinder 24 form a reading system with a minimum resolution of 0.01 mm. In some embodiments, the micrometer scale 20 can be mounted on the main body 10 using fasteners 50. In some embodiments, the fastener 50 may be a nut, a snap fastener, a rivet, a bolt, etc.

[0030] like Figure 3 and Figure 4 As shown, in some embodiments, the hook assembly 30 may include a displacement measuring assembly 31 and at least one claw 32. The displacement measuring assembly 31 is movably disposed within the guide channel 12, and at least one claw 32 is disposed at the front end of the displacement measuring assembly 31. Under the push of the micrometer screw 21, the displacement measuring assembly 31 moves along the axial direction of the guide channel 12, and at least one claw 32 moves along the radial direction of the guide channel 12. That is, at least one claw 32 moves from inside the displacement measuring assembly 31 to outside the displacement measuring assembly 31.

[0031] Understandably, the end of the main body 10 near at least one claw 32 is placed against the outer surface of the housing, and the displacement measuring component 31 corresponds to the blind hole. Then, the micrometer scale 20 is rotated so that its micrometer screw 21 pushes at least one claw 32. Since at least one claw 32 is limited by the inner wall of the main body 10 and the wall of the blind hole and cannot expand, the displacement measuring component 31 extends into the blind hole along the guide channel 12 until at least one claw 32 passes through the blind hole and reaches the inner surface of the housing. At least one claw 32 loses the limitation of the blind hole wall and moves from inside the displacement measuring component 31 to outside the displacement measuring component 31 under the push of the micrometer screw 21 to expand, so as to hook onto the inner surface of the housing. Finally, the thickness of the housing (depth of the blind hole) can be known by reading the scale on the micrometer scale 20.

[0032] For reference Figure 5 and Figure 6In some embodiments, the displacement measuring component 31 may include a mounting base 311, a positioning element 312, a support element 313, and a base 314. The positioning element 312 is mounted on the mounting base 311, and the claw 32 is slidably mounted on the positioning element 312. The positioning element 312 is vertically disposed on the main body 10 to guide and limit the sliding direction of the claw 32. In other words, the movement of the claw 32 from inside to outside the displacement measuring component 31 or from outside to inside the displacement measuring component 31 is along the axis of the positioning element 312. The support element 313 is mounted on the mounting base 311 and supports the bottom of the claw 32, limiting the movement direction of the claw 32 and guiding its movement from inside to outside the displacement measuring component 31 or from outside to inside the displacement measuring component 31. The base 314 is installed at one end of the mounting base 311. The base 314 cooperates with the limiting groove 13 of the main body 10 to enable the displacement measuring component 31 to slide along the axis of the main body 10 within the guide channel 12, thus preventing tilting. In some embodiments, the mounting base 311 and the base 314 are respectively cylindrical structures and axially connected to achieve fitting within the guide channel 12.

[0033] Refer again Figure 5 and Figure 6 In some embodiments, the mounting base 311 may include a receiving cavity 3110, a base body 3111, a fixing part 3112, and a shaft hole 3113. The receiving cavity 3110 is defined inside the base body 3111. Parts of the claws 32 are slidably disposed within the receiving cavity 3110, while other parts are located outside the receiving cavity 3110. The fixing part 3112 is disposed on the base body 3111 for connection with it. The shaft hole 3113 is formed on the base body 3111, and the positioning member 312 is installed within the shaft hole 3113. Understandably, the three claws 32 slide within the receiving cavity 3110 and can expand in three different directions within the receiving cavity 3110. When the three claws 32 abut against the cavity wall (inner wall of the base body 3111) of the receiving cavity 3110, they are limited and prevented from expanding further.

[0034] Refer again Figure 4 and Figure 5In some embodiments, the support member 313 may include at least one sliding groove 3130, a base 3131, a central through hole 3132, and a fixing hole 3133. The base 3131 has an annular structure and is installed at the inner bottom end of the seat 3111. Three sliding grooves 3130 are provided, each opening radially along the base 3131; that is, the three sliding grooves 3130 are perpendicular to the main body 10. The central through hole 3132 is located at the axis of the base 3131, and the micrometer screw 21 passes through the central through hole 3132 before pushing the chuck 32. The fixing hole 3133 serves to connect with the aforementioned base 314.

[0035] Refer again Figure 5 and Figure 6 In some embodiments, the base 314 may include a tube 3141, at least one limiting block 3142, a support ring 3143, and at least one connector 3144. The tube 3141 is mounted on the mounting base 311 near the micrometer 20. Three limiting blocks 3142 are provided, each slidably mounted in a limiting groove 13. The limiting grooves 13 are parallel to the axis of the main body 10, limiting the displacement measuring component 31 in the direction of movement of the main body 10 and preventing the displacement measuring component 31 from moving out of the guide channel 12. The support ring 3143 is installed inside the tube 3141. At least one connector 3144 is mounted on the support ring 3143 and extends towards the mounting base 311. The connector 3144 passes through a fixing hole 3133 and is mounted on a fixing part 3112, connecting the mounting base 311, the support 313, and the base 314 together.

[0036] like Figure 6 and Figure 7 As shown, in some embodiments, three claws 32 are provided. Driven by the micrometer screw 21, the three claws 32 expand in different directions to the outside of the displacement measuring component 31 to hook onto the inner surface of the housing and increase its stability.

[0037] For reference here Figure 6 and Figure 7In some embodiments, the pawl 32 may include a body 321, a locking portion 322, a guide hole 323, a sliding portion 324, a driving portion 325, and a spring abutment surface 326. The locking portion 322 is disposed at the end of the body 321 away from the support ring 313. The body 321 is parallel to the main body 10, and the locking portion 322 is perpendicular to either the main body 10 or the body 321. The locking portion 322 is parallel to the surface of the mounting base 311 at the end away from the micrometer 20. The body 321 is slidably mounted within the receiving cavity 3110. The locking portion 322 is disposed on the surface of the mounting base 311 at the end away from the base 314, and slides on this surface. In other words, the locking portion 322 slides back and forth between the inside and outside of the mounting base 311. The guide hole 323 is formed on the body 321 in a direction perpendicular to the main body axis, and the body 321 is slidably mounted on the positioning member 312 through the guide hole 321. A sliding part 324 is disposed at the end of the body 321 away from the locking part 322. The sliding part 324 is slidably installed in the sliding groove 3130. The cooperation between the guide hole 323 and the positioning member 312 and the cooperation between the sliding part 324 and the sliding groove 3130 restricts the movement direction of the claw 32, ensuring stable movement of the claw 32. A driving surface 325 is disposed at the bottom end of the body 321. The distance between the end of the driving surface 325 near the driving part 22 and the axis of the body 10 is greater than the distance between the end of the driving surface 325 away from the driving part 22 and the axis of the body 10. After the three claws 32 are closed, the driving surface 325 forms an inward concave structure with a smaller inner surface and a larger outer surface. When the three driving surfaces 325 of the three claws 32 are located in the displacement measuring component 31, the ends of the three driving surfaces 325 near the driving part 22 have openings, and the distance between the ends of the three driving surfaces 325 near the driving part 22 is greater than the distance between the ends of the three driving surfaces 325 away from the driving part 22. The drive unit 22 extends into the opening and abuts against the drive surface 325 to push the three claws 32 to expand outwards respectively, so as to hook onto the inner surface of the housing. The spring abutment surface 326 is provided at the guide hole 323 of the body 321.

[0038] like Figure 2 and Figure 4As shown, in some embodiments, the reset assembly 40 may include a first elastic element 41 and a second elastic element 42, a first fixing plate 43, and a second fixing plate 44. The first elastic element 41 is sleeved on the positioning element 312, and its two ends abut against the inner wall of the receiving cavity 3110 (the inner wall of the mounting base 311) and the spring contact surface 326, respectively, to provide an elastic force to the chuck 32. When the micrometer screw 21 removes its push on the chuck 32, the first elastic element 41 pulls the chuck 32 back to its original position using its elastic force. The first fixing plate 43 is installed at the end of the base 314 away from the mounting base 311, and the second fixing plate 44 is installed within the guide channel 12 of the main body 10 and connected to the fastener 50. The two ends of the second elastic element 42 are respectively installed between the first fixed plate 43 and the second fixed plate 44 to provide elastic force to the displacement measuring component 31. When the micrometer screw 21 removes its push on the pawl 32, the first elastic element 41 pulls the displacement measuring component 31 into the guide channel 12 of the main body 10 by the elastic force.

[0039] A non-contact in-situ gap measurement method includes the following steps: S1, for a first blind hole and a second blind hole with different diameters that are connected to each other on the housing, the depth of the first blind hole is first measured using calipers; it is understood that the blind hole is a stepped hole structure, and the blind hole includes a first blind hole and a second blind hole connected to the first blind hole. The diameter of the first blind hole is larger than the diameter of the second blind hole. Therefore, when measuring the depth of the first blind hole, calipers can be directly inserted into the first blind hole so that the calipers abut against the bottom wall of the first blind hole.

[0040] S2, the main body 10 of the measuring device is inserted into the first blind hole, and the micrometer 20 is rotated to drive the hook assembly 30. The hook assembly 30 extends forward into the second blind hole. Understandably, when the main body 10 is inserted into the first blind hole, the displacement measuring assembly 31 corresponds to the second blind hole. When the micrometer 20 is rotated to drive the driving surface 325 of the chuck 32, the locking part 322 of the chuck 32 is limited by the main body 10. The displacement measuring assembly 31 moves away from the micrometer 20, extends out of the main body 10 and into the second blind hole.

[0041] S3, until the front end of the hook assembly 30 loses the constraint of the second blind hole wall, the micrometer 20 drives the front end of the hook assembly 30 to open, so that the front end of the hook assembly 30 hooks onto the inner wall of the housing, and reads the scale on the micrometer 20 to measure the depth of the second blind hole; understandably, the locking part 322 is constrained by the second blind hole wall, and the displacement measuring assembly 31 continues to move away from the micrometer 20 until the locking part 322 loses the constraint of the second blind hole wall (until the locking part 322 passes through the second blind hole), the micrometer 20 drives the locking part 322 of the pawl 32 to move from inside the displacement measuring assembly 31 to outside the displacement measuring assembly 31 (the three locking parts 322 expand outward respectively), so that the locking part 322 hooks onto the inner wall of the housing to measure the depth of the second blind hole (please refer to Figure 9 ).

[0042] S4, the depth of the first blind hole plus the depth of the second blind hole gives the distance information from the outer surface to the inner surface of the housing.

[0043] S5, based on this distance information, a reference for the installation position is established, and sensor C is installed into the first blind hole and the second blind hole. Understandably, the installation position of sensor C is calculated based on the distance information from the outer surface to the inner surface of the housing (please refer to...). Figure 10 When calculating the gap between the target object and the installation location, the distance from the installation location to the gap is the same as the distance from the sensor C to the target object. In other words, the distance from the sensor C probe to the inner surface of the housing can be obtained by subtracting the installation location reference of the sensor C from the distance from the outer surface to the inner surface of the housing.

[0044] like Figure 10 As shown, a non-contact in-situ gap measurement and calculation method is used to measure the gap between the inner surface of a housing and a target object, including the following steps: S1, measuring the capacitance value between the sensor C and the target object. The actual distance between sensor C and the target object is calculated using the following formula. , Where A is the area of ​​the capacitor plates of sensor C. It is the dielectric constant; S2 is the distance between the inner surface of the computer housing and the probe end of sensor C, calculated using the following formula. , ;in This is the distance between the outer surface and the inner surface of the casing. This is the distance between the sensor C probe end and the outer surface of the housing; S3, calculate the gap d between the target objects using the following formula, d .

[0045] It should be noted that those skilled in the art can freely combine the above-mentioned technical features without departing from the concept of the present invention, and can also make several modifications and improvements, all of which fall within the protection scope of the present invention.

Claims

1. A non-contact in-situ gap measurement device, characterized in that, include: The main body (10) is equipped with a guide passage (12); Differential ruler (20); Hook assembly (30), the hook assembly (30) is movably disposed in the guide channel (12) and abuts against the front end of the micrometer (20), the micrometer (20) drives the hook assembly (30) to move along the guide channel (12), so that the front end of the hook assembly (30) opens after the hook assembly (30) extends out of the main body (10); The reset component (40) is connected to the hook component (30) and uses elastic force to close the front end of the hook component (30) and retract it into the body (10).

2. The non-contact in-situ gap measuring device according to claim 1, characterized in that, The hook assembly (30) includes a displacement measuring component (31) movably disposed within the guide channel (12) and at least one claw (32) movably disposed at the front end of the displacement measuring component (31); the front end of the micrometer (20) abuts against the at least one claw (32) to drive the at least one claw (32) so that after the displacement measuring component (31) moves along the guide channel (12) and extends out of the main body (10), the at least one claw (32) moves from inside the displacement measuring component (31) to outside the displacement measuring component (31).

3. The non-contact in-situ gap measuring device according to claim 2, characterized in that, The displacement measuring component (31) includes a mounting base (311), the mounting base (311) is provided with a receiving cavity (3110), the claw (32) includes a body (321) movably disposed in the receiving cavity (3110) and a locking part (322) disposed at one end of the body (321), the micrometer (20) drives the body (321) to move forward, and drives the locking part (322) to move from inside the displacement measuring component (31) to outside the displacement measuring component (31).

4. The non-contact in-situ gap measuring device according to claim 3, characterized in that, The displacement measuring assembly (31) further includes a positioning element (312) installed on the cavity wall of the receiving cavity (3110), and the positioning element (312) is perpendicular to the axis of the main body (10); the positioning element (312) passes through the claw (32).

5. The non-contact in-situ gap measuring device according to claim 3, characterized in that, The displacement measuring assembly (31) further includes a support (313) mounted on the mounting base (311), the support (313) including at least one sliding groove (3130) perpendicular to the axis of the main body (10), and the claw (32) further includes a sliding part (324) disposed at the other end of the main body (321), the sliding part (324) being slidably disposed in the sliding groove (3130).

6. The non-contact in-situ gap measuring device according to claim 2, characterized in that, The displacement measuring component (31) further includes a base (314), the base (314) including a tube (3141) and at least one limiting block (3142) disposed on the tube (3141); the tube (3141) is slidably disposed in the guide channel (12); the inner wall of the guide channel (12) is provided with at least one limiting groove (13) and is parallel to the axis of the guide channel (12), and the limiting block (3142) is slidably installed in the limiting groove (13).

7. The non-contact in-situ gap measuring device according to claim 3, characterized in that, The reset assembly (40) includes a first elastic element (41) disposed between the claw (32) and the mounting base (311).

8. The non-contact in-situ gap measuring device according to claim 6, characterized in that, The reset assembly (40) further includes a second elastic element (42) disposed between the base (314) and the end of the body (10) near the micrometer (20).

9. The non-contact in-situ gap measuring device according to claim 3, characterized in that, The chuck (32) includes a driving surface (325) disposed on the body (321), and the micrometer (20) includes a micrometer screw (21) and a driving part (22) disposed on the micrometer screw (21). The driving part (22) abuts against the driving surface (325) so that after the hook assembly (30) extends out of the body (10), the chuck (32) moves from inside the displacement measuring assembly (31) to outside the displacement measuring assembly (31).

10. The non-contact in-situ gap measuring device according to claim 9, characterized in that, The three claws (32) are provided. When the three claws (32) are closed, the driving surface (325) forms an inner concave structure with a smaller inner surface and a larger outer surface.

11. A non-contact in-situ gap measurement method, using the non-contact in-situ gap measurement device according to any one of claims 1-10, characterized in that, The steps include: S1, for the first blind hole and the second blind hole with different diameters that are connected on the housing, first use calipers to measure the depth of the first blind hole; S2, insert the main body (10) of the measuring device into the first blind hole, rotate the micrometer (20) to drive the hook assembly (30), and the hook assembly (30) extends forward into the second blind hole; S3, until the front end of the hook assembly (30) loses the limit of the second blind hole wall, the micrometer (20) drives the front end of the hook assembly (30) to open, so that the front end of the hook assembly (30) hooks onto the inner wall of the housing, and reads the scale on the micrometer (20) to measure the depth of the second blind hole. S4, the depth of the first blind hole plus the depth of the second blind hole is used to obtain the distance information from the outer surface to the inner surface of the housing; S5, establish a reference for the installation position based on the distance information, and install the sensor (C) into the first blind hole and the second blind hole.

12. A non-contact in-situ gap measurement and calculation method for measuring the gap between the inner surface of a housing and a target object. The non-contact in-situ gap measurement method according to claim 11 is characterized in that, Includes the following steps: S1, measuring the capacitance between the sensor (C) and the target object. The actual distance between the sensor (C) and the target object is calculated using the following formula. , Where A is the area of ​​the capacitor plates of the sensor (C), It is the dielectric constant; S2, the distance between the inner surface of the computer housing and the probe end of the sensor (C) is calculated using the following formula. , ;in This is the distance between the outer surface and the inner surface of the casing. The distance between the sensor (C) probe end and the outer surface of the housing; S3, calculate the gap d between the target objects using the following formula, d .

Images