Hole spacing measuring device and measuring method thereof

Abstract

The present application relates to the technical field of hole distance measurement, and discloses a hole distance measurement device and a measurement method thereof, the hole distance measurement device comprising: a reference part comprising a reference rod and two reference surfaces, the reference rod having the reference surfaces formed on both ends thereof; a measurement part comprising a measurement rod and two measurement pieces, at least one measurement piece being slidably arranged on the measurement rod, the two measurement pieces being arranged in one-to-one correspondence with the two reference surfaces, the measurement part having a calibration state and a measurement state for measuring the hole distance of two through holes on a measurement piece, when the measurement part is in the calibration state, the two measurement pieces are calibrated by the two reference surfaces; and a size display structure arranged on the measurement part, the size display structure being used for displaying the size measured by the measurement part. The present application ensures the measurement accuracy by the reference part, and the measurement accuracy is high.

Description

Technical Field

[0001] This invention relates to the field of hole spacing measurement technology, and specifically to a hole spacing measuring device and its measuring method. Background Technology

[0002] Currently, wind turbines consist of blades, embedded bushings at the blade root, and steel flanges. The flanges have a relatively large pitch circle diameter and a distributed perforated structure. Currently, a measuring tape is generally used to measure the flange's pitch circle diameter. However, measuring tapes have low accuracy and large errors, reaching 1-2 mm. Furthermore, these measuring tapes are generally not calibrated, making it impossible to guarantee measurement accuracy. Summary of the Invention

[0003] In view of this, the present invention provides a hole spacing measuring device and a measuring method thereof to solve the problem of low measurement accuracy caused by using a tape measure to measure the pitch circle diameter of a flange.

[0004] In a first aspect, the present invention provides a hole spacing measuring device, comprising: a reference part including a reference rod and two reference surfaces, wherein reference surfaces are formed on both ends of the reference rod; a measuring part including a measuring rod and two measuring elements, wherein at least one measuring element is slidably disposed on the measuring rod, and the two measuring elements are disposed in a one-to-one correspondence with the two reference surfaces; the measuring part having a calibration state and a measuring state for measuring the hole spacing of two through holes on a workpiece to be measured; when the measuring part is in the calibration state, the two measuring elements are calibrated by the two reference surfaces; and a dimension display structure disposed on the measuring part for displaying the dimension measured by the measuring part.

[0005] First, the two reference surfaces of the reference unit are used to calibrate the two measuring parts of the measuring unit. After calibration, the first reading displayed on the dimension display structure is read. Next, the two measuring parts of the measuring unit are inserted into the two through holes of the workpiece to be measured for measurement. After measurement, the second reading displayed on the dimension display structure is read. Finally, the distance between the centers of the two through holes is calculated based on the distance between the two reference surfaces, the first reading, the second reading, and the diameter of the through holes. The reference unit ensures high measurement accuracy. The hole distance measuring device is formed by the reference unit, the measuring unit, and the dimension display structure. It has a simple structure and is less expensive than a laser tracker.

[0006] In one alternative embodiment, the measuring unit and the reference unit are separately configured, and when the measuring unit is in calibration mode, it is placed on the reference rod. By separating the reference unit and the measuring unit, only the measuring unit needs to be picked up during measurement, making operation convenient and easy to handle with one hand. This reduces fatigue from prolonged gripping and significantly lowers the workload of measurement personnel.

[0007] In one optional embodiment, the measuring unit further includes an operating member that cooperates with the slidable measuring element. The operating member is rotatably mounted on the measuring rod, with one end forming an abutment end that cooperates with the slidable measuring element and the other end forming an operating end. During calibration, the operating member is manually rotated, thereby moving the slidable measuring element so that it comes into contact with the corresponding reference surface. During measurement, the operating member is manually rotated, thereby moving the slidable measuring element so that it comes into contact with the inner wall of the corresponding through hole. The design of the operating member simplifies the measurement operation and reduces the number of measurement steps.

[0008] In one optional embodiment, the measuring unit further includes a fixing seat that mates with a slidable measuring element. The fixing seat is fixed to the measuring rod and slidably connected to the slidable measuring element. The operating element is rotatably mounted on the fixing seat. The fixing seat facilitates the installation of the measuring element and the operating element, eliminating the need to machine a structure on the measuring rod to install the measuring element and the operating element, thus simplifying the structure of the measuring rod.

[0009] In one alternative embodiment, the measuring unit further includes a guide mechanism disposed between the fixed base and the slidable measuring element. The guide mechanism guides the movement of the measuring element.

[0010] In one optional embodiment, the mounting base has an elongated hole, and the measuring part further includes a connector that passes through the elongated hole and connects to a slidable measuring element. The connector and the elongated hole facilitate adjustment of the measuring element's position during measurement.

[0011] In one optional embodiment, the measuring unit further includes an anti-detachment block, which is fixed to the slidable measuring component. The abutment end abuts against the anti-detachment block, and the anti-detachment block has an anti-detachment surface that mates with the upper surface of the fixing seat. The anti-detachment block prevents the adjusting component from falling off and also allows for operation space by keeping the bolt away from the measuring surface when tightening it.

[0012] In one optional embodiment, the measuring unit further includes a magnetic element, which is fixed to the measuring component. The magnetic element is used to attract the measuring component to the mounting base to keep the slidable measuring component in a fixed position. The magnetic element can eliminate wobbling and gaps, ensuring the stability of the scale line during measurement and reading.

[0013] In one optional embodiment, the dimension display structure is the dimension display section of a vernier caliper or a micrometer. The dimension display structure borrows from the dimension display section of a vernier caliper, offering simple and convenient reading with high accuracy. Using a micrometer's dimension display section further improves measurement accuracy. In one optional embodiment, reference blocks are fixed to both ends of the reference rod, with one side of each reference block forming a reference surface; alternatively, reference holes are formed at both ends of the reference rod, with the wall of each reference hole forming a reference surface; or, a reference block is fixed to one end of the reference rod, with one side of the reference block forming a reference surface, and a reference hole is formed at the other end of the reference rod, with the wall of the reference hole forming a reference surface. The distance between the reference surfaces of the two reference blocks is machined to an accuracy of 0.05 mm, ensuring reference accuracy.

[0014] In one optional embodiment, the reference unit further includes a bracket disposed on the reference rod, with the measuring rod resting on the bracket when the measuring unit is in calibration mode. During calibration, the bracket supports the measuring unit.

[0015] Secondly, the present invention also provides a hole spacing measurement method. Using the aforementioned hole spacing measuring device, the hole spacing measurement method includes the following steps: calibrating the two measuring elements of the measuring part of the hole spacing measuring device using two reference surfaces of the reference part of the hole spacing measuring device; reading the first reading displayed by the size display structure of the hole spacing measuring device after calibration; inserting the two measuring elements of the measuring part into the two through holes of the workpiece to be measured for measurement; reading the second reading displayed by the size display structure after measurement; and calculating the distance between the centers of the two through holes based on the distance between the two reference surfaces, the first reading, the second reading, and the diameter of the through holes.

[0016] In one alternative embodiment, the measuring unit and the reference unit are separately disposed. Before the step of calibrating the two measuring elements of the measuring unit through the two reference surfaces of the reference unit, the hole distance measurement method further includes: placing the measuring unit on the reference unit; after the step of reading the first reading displayed by the dimension display structure after calibration, the hole distance measurement method further includes: adjusting at least one measuring element until the measuring unit is removed from the reference unit.

[0017] In one optional embodiment, one sliding measuring element forms an adjusting element, and the other measuring element forms a fixing element. The step of calibrating the two measuring elements of the measuring element using two reference surfaces of the reference part includes: pressing the fixing element against one reference surface of the reference part; and adjusting the adjusting element until it presses against the other reference surface of the reference part. Calibration only requires adjusting one measuring element, simplifying the operation and reducing the number of measurement steps.

[0018] In one optional embodiment, the fixing member is slidably disposed, and the step of calibrating the two measuring parts of the measuring part using the two reference surfaces of the reference part further includes: adjusting the fixing member until the first reading is an integer. The fixing member is also adjustable, which facilitates the alignment of the main scale line of the vernier scale with the full scale position of the main scale during reference calibration, facilitating subsequent readings and enabling convenient accuracy calibration at any time.

[0019] In one optional embodiment, one measuring element forms an adjusting element, and the other measuring element forms a fixing element. The step of inserting the two measuring elements of the measuring unit into two through holes of the test piece for measurement includes: first inserting the fixing element into one through hole of the test piece; then inserting the adjusting element into the other through hole of the test piece; adjusting the adjusting element until the fixing element and the adjusting element abut against the inner wall of the corresponding through hole. Only one measuring element needs to be adjusted during measurement, making the operation simple and reducing the number of measurement steps. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a perspective view of a hole spacing measuring device according to an embodiment of the present invention; Figure 2 for Figure 1 A perspective view of the reference section of the hole spacing measuring device shown; Figure 3 for Figure 1 A perspective view of the measuring section of the hole spacing measuring device shown; Figure 4 for Figure 1 Front view of the hole spacing measuring device shown; Figure 5 for Figure 4 A magnified view of part A in the diagram; Figure 6 for Figure 4 A magnified view of part B in the diagram; Figure 7 for Figure 1 A top view of the hole spacing measuring device shown; Figure 8 for Figure 7 A partial sectional view along the CC axis; Figure 9 for Figure 1 A perspective view of the left measuring component of the hole spacing measuring device shown; Figure 10 for Figure 9 A partial 3D view of the left measuring component shown; Figure 11 for Figure 1 A perspective view of the right measuring component of the hole spacing measuring device shown; Figure 12 for Figure 11A partial 3D view of the measurement component shown; Figure 13 for Figure 11 A perspective view of the measuring component of the measuring assembly shown from another angle; Figure 14 for Figure 11 A perspective view of the fixing block of the measuring component shown from another angle; Figure 15 for Figure 1 The front view of the workpiece measured by the hole spacing measuring device shown.

[0022] Explanation of reference numerals in the attached figures: 1. Reference section; 101. Reference rod; 102. Reference stop; 104. Reference surface; 105. Support; 2. Measuring section; 201. Measuring rod; 202. Measuring component; 2021. Measuring cylinder; 2022. Sliding block; 2023. Guide groove; 203. Operating component; 2031. Right screw; 2032. Torque limiting ratchet; 204. Fixing base; 2041. Guide rail; 2042. Long slot; 2043. Fixing block; 2044. Mounting block; 205. Connecting component; 206. Magnetic component; 207. Anti-detachment block; 208. First fastener; 209. Second fastener; 210. Third fastener; 3. Dimension display structure; 301. Main scale; 302. Secondary scale; 4. Test piece; 41. Through hole. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] In related technologies, measuring tapes are generally used to measure the pitch circle diameter of flanges. However, measuring tapes have low accuracy and large errors, ranging from 1mm to 2mm. Furthermore, measuring tapes are generally not calibrated, making it impossible to guarantee measurement accuracy. For precise measurement, laser trackers are typically used. These devices offer high accuracy but are complex to operate, inconvenient to use, and very expensive.

[0025] To solve the above problems, the following will be combined with... Figures 1 to 15 The following describes embodiments of the present invention.

[0026] According to an embodiment of the present invention, a hole spacing measuring device is provided, comprising: a reference part 1, a measuring part 2, and a size display structure 3.

[0027] like Figure 2 , Figure 5 and Figure 8 As shown, specifically, the reference part 1 includes a reference rod 101 and two reference surfaces 104, with reference surfaces 104 formed on both ends of the reference rod 101.

[0028] like Figure 2 , Figure 3 and Figure 15 As shown, specifically, the measuring unit 2 includes a measuring rod 201 and two measuring elements 202. The two measuring elements 202 are slidably mounted on the measuring rod 201. The two measuring elements 202 are correspondingly arranged with the two reference surfaces 104. The measuring unit 2 has a calibration state and a measurement state for measuring the hole distance between the two through holes 41 on the workpiece 4 to be measured. When the measuring unit 2 is in the calibration state, it calibrates the two measuring elements 202 through the two reference surfaces 104. The hole distance between the two through holes 41 is the distance between the centers of the two through holes 41.

[0029] like Figure 1 and Figure 6 As shown, specifically, the dimension display structure 3 is provided on the measuring unit 2, and the dimension display structure 3 is used to display the dimension measured by the measuring unit 2.

[0030] The hole spacing measuring device of this embodiment first calibrates the two measuring elements 202 of the measuring unit 2 using the two reference surfaces 104 of the reference unit 1. After calibration, the first reading displayed on the dimension display structure 3 is read. Then, the two measuring elements 202 of the measuring unit 2 are inserted into the two through holes 41 of the workpiece to be measured 4 for measurement. After measurement, the second reading displayed on the dimension display structure 3 is read. Finally, the distance between the centers of the two through holes 41 is calculated based on the distance between the two reference surfaces 104, the first reading, the second reading, and the diameter of the through holes 41. The reference unit 1 ensures high measurement accuracy. The hole spacing measuring device is formed by the reference unit 1, the measuring unit 2, and the dimension display structure 3, which has a simple structure and lower cost compared to a laser tracker.

[0031] In this embodiment, the measuring unit 2 and the reference unit 1 are separately arranged. When the measuring unit 2 is in the calibration state, it is placed on the reference rod 101. When the measuring unit 2 is in the calibration state, it is placed on the reference unit 1, and one measuring element 202 is pressed against a reference surface 104. The other measuring element 202 is moved to press against another reference surface 104. When the measuring unit 2 is in the measuring state, one measuring element 202 is first inserted into a through hole 41 of the part to be measured 4, and the other measuring element 202 is inserted into another through hole 41 of the part to be measured 4. The two measuring elements 202 are moved to abut against the inner wall of the corresponding through hole 41. During measurement, the measuring unit 2 is first placed on the reference unit 1. The two measuring elements 202 of the measuring unit 2 are calibrated using the two reference surfaces 104 of the reference unit 1. After calibration, the first reading is read from the dimension display structure 3. Then, at least one measuring element 202 is adjusted until the measuring unit 2 is removed from the reference unit 1. Next, the two measuring elements 202 of the measuring unit 2 are inserted into the two through holes 41 of the workpiece to be measured for measurement. After measurement, the second reading is read from the dimension display structure 3. Finally, the distance between the centers of the two through holes 41 is calculated based on the distance between the two reference surfaces 104, the first reading, the second reading, and the diameter of the through holes 41. By separating the reference unit 1 and the measuring unit 2, only the measuring unit 2 needs to be handled during measurement. This makes operation convenient, can be handled with one hand, and does not cause fatigue even after long periods of handling, greatly reducing the labor intensity of the measuring personnel.

[0032] In other embodiments, the measuring unit 2 is disposed on the reference unit 1, specifically, the measuring rod 201 is fixed on the reference rod 101. In other embodiments, one measuring element 202 is slidably disposed on the measuring rod 201, and another measuring element 202 is fixedly disposed on the measuring rod 201. The fixing method between the other measuring element 202 and the measuring rod 201 can be welding, bonding, riveting, etc.

[0033] like Figure 4 and Figure 15 As shown, in this embodiment, the distance between the two reference surfaces 104 is L0, the first reading is a, the second reading is c, and the diameter of the through hole 41 is D. Taking the flange as an example, the hole spacing is explained. The through hole 41 on the flange can also be called the pitch circle hole. The pitch circle diameter of the flange refers to the distance between the centers of the two oppositely arranged through holes 41. The theoretical pitch circle diameter X1 is L0+D. During measurement, the relative movement of the measuring part 202 relative to the reference part 1 is ca. The measured pitch circle diameter X2 is the sum of the theoretical pitch circle diameter X1 and the relative movement. In other words, X2=L0+D+(ca).

[0034] It should be noted that X1 is a fixed value, and a is the scale displayed by the size display structure 3 during calibration. a can be any value during calibration.

[0035] In other embodiments, the test piece 4 can be any other part that requires measuring the hole spacing between the two through holes 41.

[0036] like Figure 1 , Figure 9 , Figure 11 and Figure 12 As shown, in this embodiment, the measuring unit 2 further includes an operating member 203 that cooperates with the slidable measuring member 202. The operating member 203 is rotatably mounted on the measuring rod 201. One end of the operating member 203 forms an abutment end that cooperates with the slidable measuring member 202, and the other end of the operating member 203 forms an operating end. During calibration, the operating member 203 is manually rotated, thereby moving the slidable measuring member 202 so that the measuring member 202 is pressed against the corresponding reference surface 104. During measurement, the operating member 203 is manually rotated, thereby moving the slidable measuring member 202 so that the measuring member 202 is pressed against the inner wall of the corresponding through hole 41. The design of the operating member 203 simplifies the operation and reduces the number of measurement steps.

[0037] Alternatively, in other embodiments, the operating component 203 may be omitted, and the measuring personnel may directly push the measuring component 202.

[0038] In this embodiment, one measuring element 202 forms an adjusting element, and the other measuring element 202 forms a fixing element. During calibration, the fixing element is first placed against a reference surface 104 of the reference part 1, and then the adjusting element is adjusted until it abuts against another reference surface 104 of the reference part 1. During measurement, the fixing element is first inserted into a through hole 41 of the part to be measured 4, and then the adjusting element is inserted into another through hole 41 of the part to be measured 4. The adjusting element is then adjusted until the fixing element and the adjusting element abut against the inner wall of the corresponding through hole 41. When measuring the hole distance, the measuring personnel only need to adjust one measuring element 202, which is simple to operate and requires fewer measurement steps.

[0039] To facilitate reading and size management, the first reading can be made an integer by adjusting the corresponding operating part 203 of the fixing part.

[0040] like Figure 1 , Figure 5 , Figure 8 , Figure 9 , Figure 11 and Figure 12As shown, in this embodiment, the measuring unit 2 further includes a fixing seat 204 that cooperates with the slidable measuring element 202. The fixing seat 204 is fixed on the measuring rod 201 and is slidably connected to the slidable measuring element 202. The operating element 203 is rotatably mounted on the fixing seat 204. The fixing seat 204 facilitates the installation of the measuring element 202 and the operating element 203, eliminating the need to machine the structure for installing the measuring element 202 and the operating element 203 on the measuring rod 201, thus simplifying the structure of the measuring rod 201.

[0041] Alternatively, in other embodiments, the fixing base 204 may be omitted, and the measuring element 202 may be directly slidably connected to the measuring rod 201.

[0042] In this embodiment, the operating member 203 is threadedly connected to the fixed base 204. After the operating member 203 is rotated to the designated position and then released, the position of the measuring member 202 remains fixed, which makes the measurement accuracy higher and also facilitates reading.

[0043] like Figure 8 , Figure 9 , Figure 11 and Figure 12 As shown, in this embodiment, the fixing base 204 includes a fixing block 2043 and a mounting block 2044. The fixing block 2043 is fixed to the bottom wall of the measuring rod 201, and the mounting block 2044 is fixed to the fixing block 2043. The mounting block 2044 has a threaded hole, and the operating member 203 is threadedly connected to the threaded hole. The mounting block 2044 is fixed to the fixing block 2043 by a third fastener 210. The fixing block 2043 is fixed to the bottom wall of the measuring rod 201 by welding, bonding, riveting, or other fixing methods. The third fastener 210 is a bolt, etc.

[0044] In other embodiments, the mounting block 2044 is welded to the fixing block 2043, or the mounting block 2044 may be fixed to the measuring rod 201.

[0045] like Figure 4 , Figure 5 and Figure 8As shown, the left measuring assembly consists of a fixed base 204 and an operating component 203 on the left side of the measuring rod 201, while the right measuring assembly consists of the same fixed base 204 and operating component 203. Each of the measuring components 202, fixed base 204, and operating component 203 is provided in pairs, with each pair corresponding to the other. The two operating components 203 are designated as the left and right operating components, respectively. The right operating component includes a right screw 2031 and a torque-limiting ratchet 2032. The torque-limiting ratchet 2032 is connected to the right screw 2031, and adjustment is made via the ratchet 2032 during tightening to ensure uniform torque and measurement consistency. This allows for rapid tightening and torque control, improving measurement accuracy. The left operating component includes two left screws located on either side of the fixed component. The position of the fixed component is adjusted using these two left screws. During calibration, adjusting the position of the fixed component by adjusting the two left screws ensures that the first reading is an integer, facilitating accurate reading. It should be noted that the screw can also be called a set screw. The set screw is knurled for easy and quick manual tightening. A torque limiting ratchet 2032 is installed on the set screw to ensure uniform torque during tightening and guarantee measurement consistency.

[0046] In this embodiment, the two fixing seats 204 are a left fixing seat and a right fixing seat. The left fixing seat includes two mounting blocks 2044, which are threadedly connected to the two left screws in a one-to-one correspondence. The right fixing seat includes one mounting block 2044, which is threadedly connected to the right screw 2031.

[0047] In other embodiments, the right fixing seat is an L-shaped block and the left fixing seat is an inverted U-shaped block.

[0048] It should be noted that left and right refer to Figure 4 The direction indicated by the middle arrow: left or right.

[0049] In this embodiment, both the reference rod 101 and the measuring rod 201 are hollow rod-shaped structures, which helps to reduce weight, make operation easier, and facilitate calibration. They are suitable for measuring flanges with a diameter greater than or equal to 2.8 meters. Specifically, both the reference rod 101 and the measuring rod 201 are hollow rectangular tubes, which are lightweight, have good rigidity, and are easy for measurement personnel to handle.

[0050] In other embodiments, the reference rod 101 and the measuring rod 201 are both solid rectangular rods, etc.

[0051] like Figure 9 , Figure 10 and Figure 14As shown, in this embodiment, the fixing base 204 is provided with an elongated hole 2042, and the measuring part 2 also includes a connector 205. The connector 205 passes through the elongated hole 2042 and connects to the measuring part 202. The connection 205 and the elongated hole 2042 facilitate the adjustment of the position of the measuring part 202 during measurement. The connector 205 is specifically a bolt.

[0052] In this embodiment, the measuring unit 2 further includes a guiding mechanism disposed between the fixed base 204 and the measuring element 202. The guiding mechanism guides the movement of the measuring element 202.

[0053] like Figure 13 and Figure 14 As shown, specifically, the guiding mechanism includes a slidingly fitted guide rail 2041 and a guide groove 2023. The fixed base 204 has the guide rail 2041, and the measuring component 202 has a guide groove 2023. The cross-sectional shape of the guide rail 2041 and the guide groove 2023 is rectangular.

[0054] In other embodiments, the cross-sectional shape of the guide rail 2041 and the guide groove 2023 is T-shaped or dovetail-shaped, in which case the guide groove 2023 is a T-shaped groove or a dovetail groove.

[0055] In other embodiments, the measuring element 202 has a guide rail 2041, and the fixed seat 204 has a guide groove 2023. Alternatively, the guiding structure includes a guide hole and a guide shaft, with one of the fixed seats 204 having a guide hole and the other having a guide shaft.

[0056] like Figure 1 and Figure 11 As shown, in this embodiment, the measuring unit 2 further includes an anti-detachment top block 207. The anti-detachment top block 207 is fixed on the adjusting member, and the abutting end abuts against the anti-detachment top block 207. The anti-detachment top block 207 has an anti-detachment surface that mates with the upper surface of the fixing seat 204. The anti-detachment top block 207 prevents the adjusting member from falling and also allows for operation space by keeping the bolt away from the measuring surface when tightening it. Specifically, the anti-detachment top block 207 is T-shaped, meaning it has a stop edge to prevent it from falling. The anti-detachment top block 207 is fixed to the adjusting member by a first fastener 208, such as a screw.

[0057] like Figure 1 , Figure 10 and Figure 12As shown, in this embodiment, the measuring unit 2 further includes a magnetic component 206. The magnetic component 206 is fixed to the measuring component 202 and is used to adhere to the fixing base 204 to keep the slidable measuring component 202 in a fixed position. The magnetic component 206 eliminates shaking and gaps, ensuring the stability of the measurement and reading lines. Specifically, the magnetic component 206 is a permanent magnet such as a magnet. The magnetic component 206 is fixed to the upper surface of the measuring component 202 by a second fastener 209, such as a screw.

[0058] In other embodiments, the magnetic element 206 is an electromagnet.

[0059] In other embodiments, when the fixing base 204 is not provided, the magnetic element 206 is used to attach to the measuring rod 201.

[0060] like Figure 6 and Figure 11 As shown, in this embodiment, the dimension display structure 3 is the dimension display part of a vernier caliper. In other words, the dimension display structure 3 borrows from the dimension display part of a vernier caliper, making reading simple, convenient, and highly accurate. The dimension display structure 3 includes a main scale 301 and a secondary scale 302. The main scale 301 is fixed on the fixed base 204, and the secondary scale 302 is fixed on the adjusting component. Each division of the main scale 301 is 1mm, and each division of the secondary scale 302 is 0.9mm. The secondary scale 302 has 10 divisions, each representing 10 graduations. The measurement and reading principle is the same as that of a vernier caliper, with a measurement accuracy of 0.1mm, indicating high accuracy. Both the main scale 301 and the secondary scale 302 are made of steel rulers or similar materials.

[0061] In this embodiment, the fixing member is slidably mounted on the fixing base 204, meaning the fixing member is also adjustable. During reference calibration, it is convenient for the main scale line of the vernier scale 302 to align with the full scale position of the main scale 301, facilitating subsequent readings and enabling convenient accuracy calibration at any time.

[0062] In other embodiments, the size display structure 3 adopts a micrometer size display unit to further improve measurement accuracy. The micrometer can be a mechanical micrometer or a digital micrometer. Specifically, the size display structure 3 includes a fixed scale tube and a micrometer tube. The fixed scale tube is fixed on the fixed base 204, and the micrometer tube is fixed on the operating member 203. When the size display structure 3 adopts a micrometer size display unit, the size display structure 3 also includes a display screen, a sensor, etc.

[0063] like Figure 2 As shown, in this embodiment, reference blocks 102 are fixed to both ends of the reference rod 101, and one side of each reference block 102 forms a reference surface 104. The distance between the reference surfaces 104 of the two reference blocks 102 is machined to a precision of 0.05mm, ensuring reference accuracy. The reference blocks 102 are welded to the reference rod 101, and the reference blocks 102 are specifically L-shaped.

[0064] In other embodiments, reference holes are provided at both ends of the reference rod 101, and the wall surface of each reference hole forms a reference surface 104; or, a reference block 102 is fixed at one end of the reference rod 101, one side of the reference block 102 forms a reference surface 104, and a reference hole is provided at the other end of the reference rod 101, and the wall surface of the reference hole forms a reference surface 104.

[0065] like Figure 1 and Figure 2 As shown, in this embodiment, the reference unit 1 further includes a bracket 105 disposed on the reference rod 101. When the measuring unit 2 is in the calibration state, the measuring rod 201 is placed on the bracket 105. During calibration, the bracket 105 is used to support the measuring unit 2. The bracket 105 has an opening that matches the measuring rod 201. The number of brackets 105 is at least two.

[0066] In this embodiment, the measuring component 202 includes a measuring cylinder 2021 and a sliding block 2022. The sliding block 2022 is slidably connected to the fixed base 204. The lower end of the measuring cylinder 2021 has a guide surface for easy insertion into the through hole 41. A groove is formed on the upper surface of the sliding block 2022, and a magnet is installed in the groove.

[0067] Specifically, the fastener is securely fixed by bolts on both sides and on top, ensuring that the fastener remains stationary during measurement.

[0068] It should be noted that the directions indicated are up and down. Figure 4 The direction indicated by the middle arrow: "up" or "down".

[0069] The following is combined Figures 1 to 8 The measurement process of the hole spacing measuring device is described; Reference calibration: Place the measuring rod 201 on the reference rod 101. The cylindrical portion of the measuring cylinder 2021 of the fixing component should be pressed against one side of the reference stop 102. Adjust the quick-tightening set screw that abuts against the top block to press the measuring cylinder 2021 of the adjusting component against the other side of the reference stop 102. Then loosen the set screw and retighten the measuring cylinder 2021 using the ratchet until the ratchet rotates freely. Observe the scale dimensions at this point, accurate to 0.1mm. Calculate from the leftmost position 0. Assuming the reading is 'a', the machining distance between the reference surfaces 104 of the two reference stops 102 of the reference rod 101 is L0, and the diameter of the pitch circle hole is D. The theoretical pitch circle diameter X1 = L0 + B. After reading the value, loosen the set screw.

[0070] To facilitate reading and size management, the two bolts on both sides of the fixing component can be adjusted to align the 0 mark of the vernier scale with the 301 mark of the main scale. After adjustment, the bolts on both sides and the top of the fixing component must be firmly secured.

[0071] Measurement and Calculation: Take the measuring rod 201, first insert the measuring cylinder 2021 of the fixing part into a pitch circle hole, then insert the measuring cylinder 2021 of the other adjusting part into the corresponding pitch circle hole. The cylindrical parts of the measuring cylinders 2021 on both sides should be close to the outer side of the corresponding pitch circle hole. Manually tighten the set screw, so that the measuring cylinders 2021 on both sides are close to the smallest inner wall of the corresponding pitch circle hole. Then loosen the set screw and tighten it with the ratchet until the ratchet rotates freely. At this time, the reading can be taken, and the reading is c. At this time, the pitch circle diameter X2 = L0 + B + (ca).

[0072] The hole spacing measuring device of this application separates the reference part 1 and the measuring part 2. It measures the pitch circle diameter by measuring the relative movement of the measuring element 202. It is simple to operate, has few measurement steps, high measurement accuracy, and is inexpensive. Furthermore, both the reference rod 101 of the reference part 1 and the measuring rod 201 of the measuring part 2 are convenient hollow rod structures, which are easy to operate, can be held with one hand, and are not tiring to hold for a long time.

[0073] It should be noted that X1 can also be called the reference dimension, and X2 can also be called the measuring dimension. The measuring dimension is the sum of the reference dimension and the relative movement.

[0074] According to an embodiment of the present invention, in another aspect, a hole spacing measurement method is provided, using the above-described hole spacing measurement device. The hole spacing measurement method includes the following steps: The two measuring elements 202 of the measuring part 2 of the hole spacing measuring device are calibrated by the two reference surfaces 104 of the reference part 1 of the hole spacing measuring device. After calibration, read the first reading displayed by the dimension display structure 3 of the hole spacing measuring device; The two measuring elements 202 of the measuring unit 2 are inserted into the two through holes 41 of the part to be measured 4 to perform the measurement. After measurement, read the second reading displayed by dimension display structure 3; The distance between the centers of the two through holes 41 is calculated based on the distance between the two reference planes 104, the first reading, the second reading, and the diameter of the through hole 41.

[0075] The measurement accuracy is ensured by the reference part 1, and the measurement accuracy is high. The hole distance measuring device is formed by the reference part 1, the measuring part 2 and the size display structure 3. The structure is simple and the cost is low compared with the laser tracker.

[0076] In this embodiment, the measuring unit 2 and the reference unit 1 are separately arranged. Before the step of calibrating the two measuring elements 202 of the measuring unit 2 through the two reference surfaces 104 of the reference unit 1, the hole distance measurement method further includes: placing the measuring unit 2 on the reference unit 1; and after the step of reading the first reading displayed by the dimension display structure 3 after calibration, the hole distance measurement method further includes: adjusting at least one measuring element 202 until the measuring unit 2 is removed from the reference unit 1. By separating the reference unit 1 and the measuring unit 2, only the measuring unit 2 needs to be picked up during measurement, making operation convenient and easy to handle with one hand, reducing fatigue even after long periods of gripping, and greatly reducing the labor intensity of the measuring personnel.

[0077] In this embodiment, one measuring element 202 forms an adjusting element, and the other measuring element 202 forms a fixing element. The step of calibrating the two measuring elements 202 of the measuring unit 2 using the two reference surfaces 104 of the reference unit 1 includes: abutting the fixing element against one reference surface 104 of the reference unit 1; and adjusting the adjusting element until it abuts against the other reference surface 104 of the reference unit 1. Calibration only requires adjusting one measuring element 202, making the operation simple and reducing the number of measurement steps.

[0078] In this embodiment, the fixing member is slidably disposed. The step of calibrating the two measuring members 202 of the measuring unit 2 through the two reference surfaces 104 of the reference unit 1 further includes: adjusting the fixing member until the first reading is an integer. The fixing member is also adjustable, which facilitates the alignment of the main scale line of the vernier scale 302 with the full scale position of the main scale 301 during reference calibration, facilitating subsequent readings and enabling convenient accuracy calibration at any time.

[0079] In this embodiment, one measuring element 202 forms an adjusting element, and the other measuring element 202 forms a fixing element. The step of inserting the two measuring elements 202 of the measuring unit 2 into the two through holes 41 of the part to be measured 4 for measurement includes: first, inserting the fixing element into one through hole 41 of the part to be measured 4; then, inserting the adjusting element into the other through hole 41 of the part to be measured 4; adjusting the adjusting element until the fixing element and the adjusting element abut against the inner wall of the corresponding through hole 41. Only one measuring element 202 needs to be adjusted during measurement, which is simple to operate and requires fewer measurement steps.

[0080] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A hole spacing measuring device, characterized in that, include: The reference part (1) includes a reference rod (101) and two reference surfaces (104), and the reference surfaces (104) are formed on both ends of the reference rod (101). The measuring unit (2) includes a measuring rod (201) and two measuring elements (202). At least one of the measuring elements (202) is slidably disposed on the measuring rod (201). The two measuring elements (202) are disposed in a one-to-one correspondence with the two reference surfaces (104). The measuring unit (2) has a calibration state and a measurement state for measuring the hole distance between two through holes (41) on the test piece (4). When the measuring unit (2) is in the calibration state, the two measuring elements (202) are calibrated by the two reference surfaces (104). The measuring unit (2) further includes an operating member (203) and a fixed seat (204) that cooperate with the slidable measuring member (202). The operating member (203) is rotatably disposed on the measuring rod (201). One end of the operating member (203) forms an abutment end that cooperates with the slidable measuring member (202), and the other end of the operating member (203) forms an operating end. The fixed seat (204) is fixed on the measuring rod (201) and is slidably connected to the slidable measuring member (202). The operating member (203) is rotatably disposed on the fixed seat (204). A size display structure (3) is provided on the measuring unit (2), and the size display structure (3) is used to display the size measured by the measuring unit (2).

2. The hole spacing measuring device according to claim 1, characterized in that, The measuring part (2) and the reference part (1) are separately arranged. When the measuring part (2) is in the calibration state, the measuring part (2) is placed on the reference rod (101).

3. The hole spacing measuring device according to claim 1, characterized in that, The measuring unit (2) further includes a guide mechanism disposed between the fixed base (204) and the slidable measuring element (202).

4. The hole spacing measuring device according to claim 1, characterized in that, The fixed base (204) is provided with an elongated hole (2042), and the measuring part (2) also includes a connector (205), which passes through the elongated hole (2042) and is connected to the slidable measuring part (202).

5. The hole spacing measuring device according to claim 1, characterized in that, The measuring part (2) further includes an anti-detachment top block (207), which is fixed on the slidable measuring element (202). The abutting end abuts against the anti-detachment top block (207), which has an anti-detachment surface that cooperates with the upper surface of the fixing seat (204).

6. The hole spacing measuring device according to claim 1, characterized in that, The measuring part (2) further includes a magnetic element (206), which is fixed on the measuring part (202). The magnetic element (206) is used to adhere to the fixed base (204) to keep the position of the slidable measuring part (202) stationary.

7. The hole spacing measuring device according to any one of claims 1 to 6, characterized in that, The size display structure (3) is the size display part of a vernier caliper or a micrometer.

8. The hole spacing measuring device according to any one of claims 1 to 6, characterized in that, Reference blocks (102) are fixed at both ends of the reference rod (101), and one side of each reference block (102) forms the reference surface (104). Alternatively, reference holes are provided at both ends of the reference rod (101), and the wall surface of each reference hole forms the reference surface (104). Alternatively, a reference block (102) is fixed to one end of the reference rod (101), and a reference surface (104) is formed on one side of the reference block (102). A reference hole is opened on the other end of the reference rod (101), and the wall surface of the reference hole forms a reference surface (104).

9. The hole spacing measuring device according to any one of claims 1 to 6, characterized in that, The reference part (1) also includes a bracket (105) disposed on the reference rod (101). When the measuring part (2) is in the calibration state, the measuring rod (201) is placed on the bracket (105).

10. A method for measuring hole spacing, characterized in that, Using the hole spacing measuring device according to any one of claims 1 to 9, the hole spacing measuring method includes the following steps: The two measuring elements (202) of the measuring part (2) of the hole spacing measuring device are calibrated by the two reference surfaces (104) of the reference part (1) of the hole spacing measuring device; After calibration, read the first reading displayed by the size display structure (3) of the hole spacing measuring device; The two measuring elements (202) of the measuring unit (2) are inserted into the two through holes (41) of the test piece (4) respectively for measurement; After measurement, read the second reading displayed by the size display structure (3); The distance between the centers of the two through holes (41) is calculated based on the distance between the two reference surfaces (104), the first reading, the second reading, and the diameter of the through hole (41).

11. The hole spacing measurement method according to claim 10, characterized in that, The measuring part (2) and the reference part (1) are separately provided. Before the step of calibrating the two measuring elements (202) of the measuring unit (2) through the two reference surfaces (104) of the reference unit (1), the hole spacing measurement method further includes; Place the measuring part (2) on the reference part (1); After the step of reading the first reading displayed by the size display structure (3) after calibration, the hole distance measurement method further includes; Adjust at least one of the measuring elements (202) until the measuring part (2) is removed from the reference part (1).

12. The hole spacing measurement method according to claim 10, characterized in that, One of the sliding measuring elements (202) forms an adjusting element, and the other measuring element (202) forms a fixing element. The steps for calibrating the two measuring elements (202) of the measuring unit (2) using the two reference surfaces (104) of the reference unit (1) include: The fastener is abutted against a reference surface (104) of the reference part (1); Adjust the adjusting member until it abuts against another reference surface (104) of the reference part (1).

13. The hole spacing measurement method according to claim 12, characterized in that, The fixing member is slidably disposed, and the step of calibrating the two measuring elements (202) of the measuring unit (2) through the two reference surfaces (104) of the reference part (1) further includes: Adjust the fastener until the first reading is an integer.

14. The hole spacing measurement method according to any one of claims 10 to 13, characterized in that, One of the measuring elements (202) forms an adjusting element, and the other measuring element (202) forms a fixing element. The steps of inserting the two measuring elements (202) of the measuring unit (2) into the two through holes (41) of the workpiece to be measured (4) to perform the measurement include: First, insert the fastener into a through hole (41) of the test piece (4); Then insert the adjusting member into another through hole (41) of the test piece (4); Adjust the adjusting member until the fixing member and the adjusting member abut against the inner wall of the corresponding through hole (41).

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