A few semi-circular arc outer diameter measuring device

Abstract

The utility model relates to a kind of few semi-circular arc outer diameter measuring devices, belong to outer diameter measurement technical field;Including fixed plate, top rod seat, measuring seat, fixed seat are respectively fixedly arranged on the front end surface of fixed plate, top rod is screw-connected in the inside of top rod seat, two fixed support points are fixedly arranged on the upper end surface of measuring seat, slidingly set up movable seat on the upper end of fixed seat, spring is arranged between movable seat and fixed seat, movable rod is fixedly set up on the upper end of movable block, movable rod is slidingly inserted in measuring seat inside, movable rod upper end is fixedly set up with dynamic measuring head, split type inner diameter gauge is clamped between fixed seat and movable seat;Solved the problem that few semi-circular diameter measurement cannot realize on-site detection currently.

Description

Technical Field

[0001] This utility model belongs to the field of outer diameter measurement technology, specifically relating to a device for measuring the outer diameter of a semi-circular arc. Background Technology

[0002] Measuring the diameter of a semicircle is a common problem in the machinery industry. Commonly used methods suffer from large errors and cumbersome calculations, making them difficult to meet requirements. Coordinate measuring machines and roundness testers are time-consuming and inefficient, and cannot be used for on-site inspection. To improve production efficiency, a gauge was designed for on-site measurement of the outer diameter of a crescent-shaped plate. Utility Model Content

[0003] This invention overcomes the shortcomings of the prior art and proposes a device for measuring the outer diameter of a semicircle; it solves the problem that the current measurement of the diameter of a semicircle cannot be carried out on-site.

[0004] To achieve the above objectives, this utility model is implemented through the following technical solution.

[0005] A device for measuring the outer diameter of a semi-circular arc includes a fixed plate. A top rod seat, a measuring seat, and a fixed seat are fixedly mounted on the front, middle, and lower sides of the fixed plate, respectively. A top rod is screwed into the top rod seat. Two fixed fulcrums are fixedly mounted on the upper end face of the measuring seat. A movable seat is slidably mounted on the upper end of the fixed seat. A spring is installed between the movable seat and the fixed seat. A movable rod is fixedly mounted on the upper end of the movable block. The movable rod is slidably inserted into the measuring seat. A movable measuring head is fixedly mounted on the upper end of the movable rod. A split-type inner diameter gauge is clamped between the fixed seat and the movable seat.

[0006] Furthermore, the top rod seat is fixedly connected to the front end face of the fixing plate by two screws on the left and right; two positioning pins are inserted between the measuring seat and the fixing plate, and the measuring seat is fixedly connected to the front end face of the fixing plate by two screws; two positioning pins are inserted between the fixing seat and the fixing plate, and the fixing seat is fixedly connected to the front end face of the fixing plate by two screws.

[0007] Furthermore, the push rod remains vertical, the lower end of the push rod has a hemispherical structure, and a handle is fixedly installed at the upper end of the push rod, with the handle located above the push rod seat.

[0008] Furthermore, a measuring groove is provided on the upper surface of the measuring base, and the upper ends of the inner walls on the left and right sides of the measuring groove are inclined toward the side that is far away from each other; two fixed supports are respectively fixed on the inner walls on the left and right sides of the measuring groove.

[0009] Furthermore, the movable rod remains vertical, with its upper end slidably inserted into the center of the bottom surface of the measuring groove. The moving probe is located in the middle of the inner side of the measuring groove, and two fixed fulcrums are symmetrically arranged on the left and right sides of the moving probe.

[0010] Furthermore, the movable block is provided with two symmetrical vertical through-hole upper insertion slots, and the fixed base is provided with two symmetrical vertical through-hole lower insertion slots, with the two upper insertion slots corresponding one-to-one with the two lower insertion slots; an upper spring groove is provided at the lower opening of each upper insertion slot, and a lower spring groove is provided at the upper opening of each lower insertion slot.

[0011] Furthermore, the same guide rod is inserted into the corresponding upper and lower insertion slots. An anti-detachment ring is fixedly installed at the upper end of the guide rod, and a fixing nut is screwed onto the lower end of the guide rod.

[0012] Furthermore, a spring is fitted onto the outside of each guide rod, with the upper and lower ends of the spring located inside the upper and lower spring grooves on the same side, respectively.

[0013] Furthermore, a semi-circular upper clamping groove is provided in the middle of the lower end face of the movable seat, and a semi-circular lower clamping groove is provided in the middle of the upper end face of the fixed seat, with the upper clamping groove and the lower clamping groove corresponding vertically.

[0014] Furthermore, the probe of the split-type inner diameter gauge 11 is clamped between the upper clamping groove and the lower clamping groove.

[0015] The beneficial effects of this utility model compared to the prior art are as follows: The semi-circular outer diameter measuring device provided by this utility model can measure the outer crescent diameter on site, simplifying the measurement method and improving production efficiency. Attached Figure Description

[0016] The present invention will now be described in further detail with reference to the accompanying drawings: Figure 1 This is a front view of the present invention; Figure 2 This is a side sectional view of the present invention; Figure 3 This is a schematic diagram of the structure of a split-type inner diameter gauge; Figure 4 This is a schematic diagram illustrating the measurement principle of the chord height and chord length method. Figure 5 This is a schematic diagram of the measurement values ​​of the chord height and chord length method; Among them, 1 is a fixed plate, 2 is a top rod seat, 3 is a measuring seat, 4 is a fixed seat, 5 is a top rod, 6 is a fixed fulcrum, 7 is a movable seat, 8 is a spring, 9 is a movable rod, 10 is a movable measuring head, 11 is a split-type inner diameter gauge, 12 is a screw, 13 is a positioning pin, 14 is a handle, 15 is a guide rod, 16 is a fixing nut, 17 is an upper clamping groove, 18 is a lower clamping groove, 19 is a measuring stylus, and 20 is a crescent plate. Detailed Implementation

[0017] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, this utility model will be further described in detail with reference to the embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of this utility model and are not intended to limit it. The technical solution of this utility model will be described in detail below with reference to the embodiments and accompanying drawings, but the scope of protection is not limited thereto.

[0018] like Figure 1 As shown in Figure 3, this utility model provides a device for measuring the outer diameter of a semi-circular arc, including a fixed plate 1. A top rod seat 2, a measuring seat 3, and a fixed seat 4 are fixedly arranged on the front end face, middle side, and lower side of the fixed plate 1, respectively. A top rod 5 is screwed into the top rod seat 2. Two fixed support points 6 are fixedly arranged on the upper end face of the measuring seat 3. A movable seat 7 is slidably arranged on the upper end of the fixed seat 4. A spring 8 is arranged between the movable seat 7 and the fixed seat 4. A movable rod 9 is fixedly arranged on the upper end of the movable seat 7. The movable rod 9 is slidably inserted into the measuring seat 3. A movable measuring head 10 is fixedly arranged on the upper end of the movable rod 9. A split-type inner diameter gauge 11 is clamped between the fixed seat 4 and the movable seat 7.

[0019] The fixing plate 1 is a square plate-shaped structure located in the left and right vertical planes. The top rod seat 2 is fixedly connected to the front end face of the fixing plate 1 by two screws 12 on the left and right sides. Two positioning pins 13 are inserted between the measuring seat 3 and the fixing plate 1 to complete the positioning between the measuring seat 3 and the fixing plate 1. The measuring seat 3 is fixedly connected to the front end face of the fixing plate 1 by two screws 12. Two positioning pins 13 are inserted between the fixing seat 4 and the fixing plate 1 to complete the positioning between the fixing seat 4 and the fixing plate 1. The fixing seat 4 is fixedly connected to the front end face of the fixing plate 1 by two screws 12.

[0020] The top rod 5 remains vertical, and the lower end of the top rod 5 has a hemispherical structure. A handle 14 is fixedly installed at the upper end of the top rod 5. The handle 14 is located above the top rod seat 2. The top rod 5 can be rotated through the handle 14, thereby adjusting the height of the top rod 5.

[0021] A concave "︺"-shaped measuring groove is provided on the upper surface of the measuring base 3. The bottom surface of the measuring groove is kept horizontal, and the upper ends of the inner walls on the left and right sides of the measuring groove are inclined towards the side that is farther away from each other. Two fixed support points 6 are respectively fixedly set on the inner walls on the left and right sides of the measuring groove.

[0022] The movable rod 9 remains vertical, and its upper end is slidably inserted into the center of the bottom surface of the measuring groove. The movable probe 10 is located in the middle of the inner side of the measuring groove, and two fixed support points 6 are symmetrically arranged on the left and right sides of the movable probe 10.

[0023] Two symmetrical, vertically extending upper insertion slots are provided on the movable base 7, and two symmetrical, vertically extending lower insertion slots are provided on the fixed base 4. The two upper insertion slots correspond one-to-one with the two lower insertion slots. An upper spring groove is provided at the lower opening of each upper insertion slot, with an inner diameter larger than the inner diameter of the upper insertion slot itself. Similarly, a lower spring groove is provided at the upper opening of each lower insertion slot, with an inner diameter larger than the inner diameter of the lower insertion slot itself. A guide rod 15 is inserted into the corresponding upper and lower insertion slots, with both ends of the guide rod 15 extending beyond the outer sides of the upper and lower insertion slots. An anti-detachment ring is fixedly installed at the upper end of the guide rod 15, with an outer diameter larger than the inner diameter of the upper insertion slot. A fixing nut 16 is screwed onto the lower end of the guide rod 15. A spring 8 is sleeved on the outside of each guide rod 15, with the upper and lower ends of the spring 8 located inside the upper and lower spring grooves on the same side, respectively. When the movable seat 7 is not subjected to external force, the maximum distance is maintained between the movable seat 7 and the fixed seat 4 under the action of the spring 8's restoring force.

[0024] A semi-circular upper clamping groove 17 is provided in the middle of the lower end face of the movable seat 7, and a semi-circular lower clamping groove 18 is provided in the middle of the upper end face of the fixed seat 4. The upper clamping groove 17 and the lower clamping groove 18 correspond vertically. The probe 19 of the split-type inner diameter gauge 11 is clamped between the upper clamping groove 17 and the lower clamping groove 18.

[0025] The working principle of this utility model is as follows: String height and chord length measurement, as follows Figure 4 As shown, the radius of the circle is R, the chord length is L, and the chord height is h. The diameter of the circle can be calculated as 2R = L. 2 / 4h+h, from the above formula, it can be seen that when the chord length L is fixed, there is a corresponding relationship between the diameter 2R and h, but it is not a linear relationship. Thus, when the chord length is constant, the diameter can be obtained by measuring the chord height and then calculating, which is quite cumbersome and not suitable for field use.

[0026] like Figure 5 As shown, taking crescent plate 20 as an example, we will further analyze the correspondence between chord height and radius: when the reference chord height of crescent plate 20 is 9.387, the corresponding workpiece diameter is 51.999. When the chord height increases or decreases by 0.005, the diameter change is calculated, as shown in the table below. Table 1: Corresponding Arc Diameters When Chord Height Changes String height diameter chord height variation Diameter variation 9.407 51.929 +0.005 -0.017 9.402 51.946 +0.005 -0.018 9.397 51.964 +0.005 -0.017 9.392 51.981 +0.005 -0.018 9.387 51.999 0 0 9.382 52.017 -0.005 +0.018 9.377 52.035 -0.005 +0.018 9.372 52.052 -0.005 +0.017 9.367 52.070 -0.005 +0.018 As can be seen from the table above, the chord height and diameter have an approximately inverse linear relationship within a certain range. When the proportionality coefficient is taken as the average value, K = -(0.017+0.018) / (0.005+0.005) = -3.5. The diameter is calculated according to this coefficient with an error of 0.5μm, which is sufficient for the machining of the crescent plate 20 part.

[0027] When the movable seat 7 is not subjected to external force, under the action of the spring 8, the movable seat 7 and the fixed seat 4 maintain the maximum distance. At this time, the movable rod 9 and the moving probe 10 are at the maximum height. At this time, the height of the moving probe 10 is consistent with the height of the fixed support points 6 on both sides.

[0028] When it is necessary to measure the diameter of the outer crescent surface of the crescent plate 20 on-site, place the crescent plate 20 on the movable measuring head 10, and keep the end face of the crescent plate 20 in contact with the front face of the fixed plate 1, with the middle of the outer crescent surface of the crescent plate 20 in contact with the movable measuring head 10. Then, rotate the push rod 5 through the handle 14, and the push rod 5 will descend until the lower end of the push rod 5 contacts the inner crescent surface of the crescent plate 20. Then continue to rotate the push rod 5, and the push rod 5 will continue to descend, applying pressure to the crescent plate 20, causing the crescent plate 20 to move downward. The crescent plate 20 drives the movable measuring head 10 to move downward, and the movable measuring head 10 drives the movable rod 9 and the movable seat 7 to move downward synchronously. The upper clamping groove 17 on the movable seat 7 and the lower clamping groove 18 on the fixed seat 4 begin to apply pressure to the probe 19 of the split-type inner diameter gauge 11, and the split-type inner diameter gauge 11 begins to read. When the two ends of the outer crescent surface of the crescent plate 20 come into contact with the two fixed fulcrums 6, the crescent plate 20 can no longer move downwards. At this time, the downward movement of the movable seat 7 reaches its maximum, and the reading of the split-type inner diameter gauge 11 also reaches its maximum. At this time, the reading of the split-type inner diameter gauge 11 is the chord height h of the outer crescent surface of the crescent plate 20, and the fixed distance between the two fixed fulcrums 6 is the chord length L of the outer crescent surface of the crescent plate 20. The diameter of the outer crescent surface of the crescent plate 20 can be obtained by combining the chord height h and the chord length L with the proportional coefficient.

[0029] As the measurement principle shows, the proportionality coefficient between the chord height and the diameter will change due to variations in workpiece dimensions or manufacturing errors in the measuring device. For different workpieces or tooling, to determine the proportionality coefficient, two reference blocks of different dimensions need to be made according to the dimensions of the workpiece being measured. The proportionality coefficient is determined by measuring the two chord heights corresponding to these reference blocks. This invention selects the upper and lower limit dimensions of the workpiece.

[0030] As can be seen from the table above showing the correspondence between chord height and diameter, the variation in chord height is much smaller than that in diameter. Therefore, when the diameter tolerance of the workpiece is small, the diameter must be measured by checking the chord height, and the accuracy of the measuring instrument must be sufficiently high. Thus, we chose a measuring instrument with a value of 0.001. Furthermore, since the proportionality coefficient is generally not an integer, conversion is relatively complicated. To solve this problem, we selected a segmented inner diameter gauge 11 and made improvements to it.

[0031] like Figure 3 The diagram shows a split-type inner diameter gauge 11. When inspecting a part, changes in size cause changes in the opening of the valve body. These changes in valve opening then compress the tip of the probe 19, causing axial movement of the probe 19. The probe 19 then drives the gauge index to rotate, thus achieving the inspection purpose. When the tip angle is 53.13°, calculations show that the change in valve opening is in a 1:1 ratio to the axial change of the probe 19. Figure 3 As can be seen, adjusting the gauge's scaling factor can be achieved simply by adjusting the cone tip angle. Since the absolute value of the scaling factor between the chord height and the diameter is greater than 1, it is generally best to reduce the cone tip angle to make the scaling factor an integer; ideally, the scaling factor should be adjusted to 1. This allows for convenient measurement of the 20mm arc diameter of the outer crescent plate.

[0032] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A device for measuring the outer diameter of a semi-circular arc, characterized in that: The device includes a fixed plate (1), a top rod seat (2), a measuring seat (3), and a fixed seat (4) fixedly installed on the front, middle, and lower sides of the fixed plate (1), a top rod (5) screwed inside the top rod seat (2), two fixed support points (6) fixedly installed on the upper end face of the measuring seat (3), a movable seat (7) slidably installed on the upper end of the fixed seat (4), a spring (8) installed between the movable seat (7) and the fixed seat (4), a movable rod (9) fixedly installed on the upper end of the movable seat (7), the movable rod (9) slidably inserted into the measuring seat (3), a movable measuring head (10) fixedly installed on the upper end of the movable rod (9), and a split-type inner diameter gauge (11) clamped between the fixed seat (4) and the movable seat (7).

2. The device for measuring the outer diameter of a partial arc as described in claim 1, characterized in that: The top rod seat (2) is fixedly connected to the front end face of the fixing plate (1) by two screws (12) on the left and right sides; two positioning pins (13) are inserted between the measuring seat (3) and the fixing plate (1), and the measuring seat (3) is fixedly connected to the front end face of the fixing plate (1) by two screws (12); two positioning pins (13) are inserted between the fixing seat (4) and the fixing plate (1), and the fixing seat (4) is fixedly connected to the front end face of the fixing plate (1) by two screws (12).

3. The device for measuring the outer diameter of a partial arc according to claim 1, characterized in that: The top rod (5) remains vertical. The lower end of the top rod (5) is a hemispherical structure. A handle (14) is fixedly installed on the upper end of the top rod (5). The handle (14) is located above the top rod seat (2).

4. The device for measuring the outer diameter of a partial arc according to claim 1, characterized in that: A measuring groove is provided on the upper surface of the measuring seat (3), and the upper ends of the inner walls on the left and right sides of the measuring groove are inclined to the side that is far away from each other; two fixed supports (6) are respectively fixed on the inner walls on the left and right sides of the measuring groove.

5. The device for measuring the outer diameter of a partial arc according to claim 4, characterized in that: The movable rod (9) remains vertical, and the upper end of the movable rod (9) is slidably inserted into the center of the bottom surface of the measuring groove. The moving probe (10) is located in the middle of the inner side of the measuring groove, and two fixed support points (6) are symmetrically arranged on the left and right sides of the moving probe (10).

6. The device for measuring the outer diameter of a partial arc according to claim 1, characterized in that: Two vertically symmetrical upper insertion slots are provided on the movable seat (7), and two vertically symmetrical lower insertion slots are provided on the fixed seat (4). The two upper insertion slots correspond one-to-one with the two lower insertion slots. An upper spring groove is provided at the lower opening of each upper insertion slot, and a lower spring groove is provided at the upper opening of each lower insertion slot.

7. The device for measuring the outer diameter of a partial arc according to claim 6, characterized in that: The same guide rod (15) is inserted into the corresponding upper and lower insertion slots. An anti-detachment ring is fixedly installed at the upper end of the guide rod (15), and a fixing nut (16) is screwed onto the lower end of the guide rod (15).

8. The device for measuring the outer diameter of a partial arc according to claim 7, characterized in that: A spring (8) is fitted on the outside of each guide rod (15), with the upper and lower ends of the spring (8) located in the upper and lower spring grooves on the same side, respectively.

9. The device for measuring the outer diameter of a partial arc according to claim 1, characterized in that: A semi-circular upper clamping groove (17) is provided in the middle of the lower end face of the movable seat (7), and a semi-circular lower clamping groove (18) is provided in the middle of the upper end face of the fixed seat (4). The upper clamping groove (17) and the lower clamping groove (18) correspond to each other vertically.

10. A device for measuring the outer diameter of a partial arc according to claim 9, characterized in that: The probe (19) of the split-type inner diameter gauge (11) is held between the upper clamping groove (17) and the lower clamping groove (18).

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