Large-size narrow circular arc radius measuring device

Abstract

This utility model discloses a large-size narrow arc radius measuring device, including a measuring unit and a calibration unit. The calibration unit is a sector-shaped standard block, which includes a sector-shaped base body. The radius of the sector-shaped base body is equal to the standard radius of the workpiece being measured. A vertically penetrating standard block shaft mounting hole is opened at the center of the sector-shaped base body, and an arc-shaped standard block radius measuring block is vertically arranged along the arc edge of the sector-shaped base body. The measuring unit includes a rotating shaft, the lower end of which is installed in the standard block shaft mounting hole. The measuring unit includes a horizontally arranged dial indicator mounting bracket, one end of which is fitted onto the middle section of the rotating shaft. A horizontally arranged dial indicator is mounted on the mounting bracket, and the dial indicator measures and calibrates the radius of the inner surface of the sector-shaped standard block. The device in this embodiment is based on the principle of comparative measurement and mainly consists of two parts: a measuring unit and a calibration unit. It achieves the purpose of indirectly measuring the arc radius of the workpiece being measured with high accuracy.

Description

Technical Field

[0001] This utility model belongs to the field of precision measurement technology, and relates to a large-size narrow arc radius measuring device. Background Technology

[0002] Circular radius measurement is typically performed using coordinate measuring machines (CMMs). When the arc area is large and the number of measurement points is sufficient, CMMs are the most suitable and economical measurement method. However, when measuring large, narrow arc radii, the arc area is extremely narrow. Continuing to use a CMM results in a very dense measurement point count, leading to significant errors in the fitted measurement results and hindering effective evaluation.

[0003] Currently, in the development of new retarder products, the radius of the arc to be measured on the part is required to be R97.5mm (with an error of 0 and +0.1). The angle of the arc area is only 14°, accounting for less than 4% of the whole circle. Traditional measurement methods, including coordinate measuring machines, cannot effectively measure this. It is necessary to design a special fixture to solve the problem of measuring the arc radius. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a large-size narrow arc radius measuring device to solve the technical problem that it is difficult to measure the radius of large-size narrow arcs in the existing technology.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A large-size narrow arc radius measuring device includes a measuring unit and a calibration unit. The calibration unit is a sector-shaped standard block, which includes a sector-shaped base body. The radius of the sector-shaped base body is equal to the standard radius of the workpiece being measured. A vertically penetrating standard block shaft mounting hole is also provided at the center of the sector-shaped base body. The diameter of the standard block shaft mounting hole is equal to the diameter of the central hole at the center of the workpiece being measured. An arc-shaped standard block radius measuring block is also integrally provided vertically along the arc edge of the sector-shaped base body.

[0006] The measuring unit includes a rotating shaft, the lower end of which is installed in the rotating shaft mounting hole of the standard block and can rotate circumferentially relative to the rotating shaft mounting hole of the standard block; the measuring unit also includes a horizontally arranged dial indicator mounting bracket, one end of which is fitted onto the middle section of the rotating shaft, and the dial indicator mounting bracket is limited circumferentially and radially by the rotating shaft. A horizontally arranged dial indicator is also installed on the dial indicator mounting bracket, which measures and calibrates the radius of the inner side surface of the sector-shaped standard block.

[0007] The middle section of the rotating shaft is also fitted with multiple mounting bracket height adjustment rings. The mounting bracket height adjustment rings are arranged at the top or bottom of the dial indicator mounting bracket. By increasing the number of mounting bracket height adjustment rings at the bottom of the dial indicator mounting bracket, the vertical position of the dial indicator mounting bracket can be adjusted, thereby adjusting the vertical position of the dial indicator measuring head.

[0008] The measuring head of the dial indicator can also rotate circumferentially by rotating the upper end of the rotating shaft, thereby enabling measurement at different circumferential positions of the standard block radius measuring block.

[0009] This utility model also has the following technical features: Specifically, the rotating shaft includes, from bottom to top along the axial direction, an integrated rotating shaft mounting section, a bottom shoulder limiting section of the mounting bracket, a mounting bracket section, a top limiting section of the mounting bracket, and a rotating shaft rotation drive section.

[0010] The rotating shaft mounting section includes a cylindrical rotating shaft mounting section body, which is inserted into the rotating shaft mounting hole of the standard block, and the rotating shaft mounting section body and the rotating shaft mounting hole of the standard block are clearance-fitted; a rotating shaft exhaust groove is also provided on the outer side wall of the rotating shaft mounting section body along the axial direction.

[0011] The outer diameter of the bottom shoulder limiting section of the mounting bracket is larger than the diameter of the standard block shaft mounting hole, thereby achieving axial limiting of the shaft within the standard block shaft mounting hole; the outer diameter of the bottom shoulder limiting section of the mounting bracket is also larger than the outer diameter of the mounting bracket section, thereby achieving axial lower-end limiting of the table mounting bracket and the mounting bracket height adjustment ring.

[0012] Specifically, the mounting bracket section includes a long-axis-shaped mounting bracket body. A circumferential limiting keyway for the mounting bracket is formed along the axial direction on the outer side wall of the mounting bracket body, and a circumferential limiting key for the mounting bracket is installed in the circumferential limiting keyway. The watch mounting bracket and the mounting bracket height adjustment ring are both fitted onto the mounting bracket body, and both the watch mounting bracket and the mounting bracket height adjustment ring are circumferentially limited by the circumferential limiting key for the mounting bracket.

[0013] The mounting bracket top limiting section includes a cylindrical mounting bracket top limiting section body. The outer side wall of the mounting bracket top limiting section body is provided with a mounting bracket top limiting section external thread. The mounting bracket top limiting section body is connected to the mounting bracket top limiting nut through the mounting bracket top limiting section external thread, thereby realizing the axial upper end limiting of the mounting bracket and the mounting bracket height adjustment ring.

[0014] The aforementioned rotating shaft drive section includes a cylindrical rotating shaft drive section body. A radially penetrating handle mounting hole is provided on the rotating shaft drive section body. A rotating shaft handle is installed radially inside the handle mounting hole. The circumferential rotation of the dial indicator's measuring head is achieved by rotating the rotating shaft handle circumferentially.

[0015] Specifically, the watch mounting bracket includes a horizontally arranged watch mounting bracket body. One end of the watch mounting bracket body has a mounting bracket mounting hole that passes through the watch mounting bracket body and has a keyway. The watch mounting bracket body is fitted onto the mounting bracket section through the mounting bracket mounting hole.

[0016] The dial indicator mounting bracket body is provided with a vertical through hole for a dial indicator fixing seat near one end. The lower surface of the dial indicator mounting bracket body near one end is also integrally provided with a first dial indicator fixing seat. The second dial indicator fixing seat at the bottom of the dial indicator passes through the through hole for the dial indicator fixing seat. The second dial indicator fixing seat and the first dial indicator fixing seat are fastened together by a dial indicator fastening pin.

[0017] The upper surface of the other end of the mounting bracket body is also integrally provided with a dial indicator guide block. The upper surface of the dial indicator guide block is provided with a dial indicator guide groove that passes through the dial indicator guide block. The measuring head of the dial indicator passes through the dial indicator guide groove for guidance and limitation.

[0018] Specifically, the mounting bracket height adjustment ring is in the shape of an annular block, and the mounting bracket height adjustment ring is fitted onto the mounting bracket section.

[0019] The inner wall of the mounting bracket height adjustment ring is also provided with an axially penetrating adjustment ring mounting keyway. The mounting bracket height adjustment ring achieves circumferential limitation through the cooperation between the adjustment ring mounting keyway and the mounting bracket circumferential limit key.

[0020] Specifically, the depth of the center hole at the center of the workpiece being measured is equal to the depth of the mounting hole of the standard block shaft.

[0021] Compared with the prior art, the present invention has the following beneficial technical effects: (I) The device in this embodiment is designed based on the principle of comparison measurement and mainly consists of two parts: a measurement unit and a calibration unit. Before measurement, the measurement unit needs to be calibrated using a sector standard block with a known radius and center. Then, the arc dimension on the workpiece with a known center is measured. By using the pointer position of the dial indicator, the arc radius of the workpiece can be indirectly measured. It has the characteristics of convenient measurement and high accuracy.

[0022] (II) The mounting bracket height adjustment ring in this embodiment is used to adjust the height of the meter mounting bracket in the vertical height direction. By increasing or decreasing the number of mounting bracket height adjustment rings at the bottom of the meter mounting bracket, the measurement of arc radius at different heights can be achieved.

[0023] (III) In this embodiment, the rotating shaft mounting section of the device is fitted with the center hole at the center of the workpiece being measured or the rotating shaft mounting hole of the standard block to achieve the rotation measurement of the measuring unit; the circumferential limiting key in the mounting bracket of the rotating shaft is used to circumferentially fasten the relative rotation between the rotating shaft, the table mounting bracket and the mounting bracket height adjustment ring. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the device in this utility model.

[0025] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure at section AA.

[0026] Figure 3 This is a schematic diagram of the structure of the sector-shaped standard block in this utility model.

[0027] Figure 4 This is a schematic diagram of the rotating shaft in this utility model.

[0028] Figure 5 This is a schematic diagram of the structure of the table mounting bracket in this utility model.

[0029] Figure 6 This is a schematic diagram of the mounting bracket height adjustment ring in this utility model.

[0030] Figure 7 This is a schematic diagram of the measuring unit in this utility model.

[0031] Figure 8 This is a schematic diagram of the measuring unit in this utility model when the height is 0 during calibration.

[0032] Figure 9 This is a schematic diagram of the dial indicator in this utility model.

[0033] Figure 10 This is a schematic diagram of the measuring unit in this utility model when measuring the workpiece.

[0034] The meanings of the labels in the figure are as follows: 1-Measuring unit, 2-Mounting bracket section shim, 3-Sector-shaped standard block, 4-Workpiece to be measured, 5-Rotating shaft, 6-Indicator mounting bracket, 7-Dial indicator, 8-Mounting bracket height adjustment ring, 9-Mounting bracket top limit nut, 10-Rotating shaft handle, 11-Dial indicator fastening pin, 12-Adjusting ring mounting keyway.

[0035] 301-Fan-shaped chassis body, 302-Standard block shaft mounting hole, 303-Standard block radius measuring block.

[0036] 501 - Rotary shaft mounting section, 502 - Bottom shoulder limiting section of mounting bracket, 503 - Mounting bracket section, 504 - Top limiting section of mounting bracket, 505 - Rotary shaft rotation drive section.

[0037] 601 - Dial indicator mounting bracket body, 602 - Mounting hole of mounting bracket, 603 - Through hole of dial indicator fixing seat, 604 - First fixing seat of dial indicator, 605 - Dial indicator guide block, 606 - Dial indicator guide groove.

[0038] 701 - Measuring head, 702 - Second mounting bracket for dial indicator.

[0039] 50101 - Shaft mounting section body, 50102 - Shaft exhaust groove.

[0040] 50301 - Mounting frame section body, 50302 - Mounting frame circumferential limit keyway, 50303 - Mounting frame circumferential limit key.

[0041] 50401 - Mounting bracket top limiting section body, 50402 - Mounting bracket top limiting section external thread.

[0042] 50501 - Rotary shaft drive section body; 50502 - Handle mounting hole.

[0043] The specific content of this utility model will be further explained in detail below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0044] It should be noted that, unless otherwise specified, all equipment and components in this utility model are commonly used in the art and are known in the prior art. For example, the dial indicator is a known dial indicator, the top limit nut of the mounting bracket is a known standard nut, the dial indicator fastening pin is a known standard pin, the mounting bracket section gasket is a known standard gasket, and the mounting bracket circumferential limit key is a known standard limit key.

[0045] In this invention, the XOY coordinate system is a two-dimensional rectangular coordinate system. The X-axis is horizontal, which is the horizontal direction; the Y-axis is vertical, and the axis of the rotating shaft 5 is the vertical direction; the mounting end of the rotating shaft 5 on the sector-shaped standard block 3 is the lower axial end of the rotating shaft 5.

[0046] In this invention, "large size" refers to the radius of the arc of the workpiece being measured being greater than or equal to 97.5 mm; "narrow arc" refers to the central angle of the arc of the workpiece being measured being less than or equal to 14°.

[0047] Following the above technical solution, the following are specific embodiments of this utility model. It should be noted that this utility model is not limited to the following specific embodiments, and all equivalent modifications made based on the technical solution of this application fall within the protection scope of this utility model.

[0048] Example: This embodiment provides a large-size narrow arc radius measuring device, such as... Figures 1 to 3 As shown, it includes a measurement unit 1 and a calibration unit; the calibration unit is a sector-shaped standard block 3, which includes a sector-shaped base body 301. The radius of the sector-shaped base body 301 is equal to the standard radius of the workpiece 4 being measured. A vertically penetrating standard block shaft mounting hole 302 is also provided at the center of the sector-shaped base body 301. The diameter of the standard block shaft mounting hole 302 is equal to the diameter of the central hole at the center of the workpiece 4 being measured. An arc-shaped standard block radius measuring block 303 is also integrally provided vertically along the arc edge of the sector-shaped base body 301.

[0049] like Figure 7 As shown, the measuring unit 1 includes a rotating shaft 5, the lower axial end of which is installed in the rotating shaft mounting hole 302 of the standard block and can rotate circumferentially relative to the rotating shaft mounting hole 302 of the standard block; the measuring unit 1 also includes a horizontally arranged dial indicator mounting bracket 6, one end of which is fitted onto the middle section of the rotating shaft 5. The dial indicator mounting bracket 6 is limited circumferentially and radially by the rotating shaft 5. A horizontally arranged dial indicator 7 is also installed on the dial indicator mounting bracket 6. The dial indicator 7 measures and calibrates the radius of the inner side of the sector-shaped standard block 3.

[0050] Multiple mounting bracket height adjustment rings 8 are also fitted on the middle section of the rotating shaft 5. The mounting bracket height adjustment rings 8 are arranged at the top or bottom of the dial indicator mounting bracket 6. By increasing the number of mounting bracket height adjustment rings 8 at the bottom of the dial indicator mounting bracket 6, the vertical position of the dial indicator mounting bracket 6 can be adjusted, thereby adjusting the vertical position of the measuring head 701 of the dial indicator 7.

[0051] The measuring head 701 of the dial indicator 7 can also rotate circumferentially by rotating the upper end of the shaft 5, thereby enabling measurement of the standard block radius measuring block 303 at different circumferential positions.

[0052] As a preferred embodiment of this invention, such as Figure 4 As shown, the rotating shaft 5 includes, from bottom to top along the axial direction, an integrated rotating shaft mounting section 501, a mounting bracket bottom shoulder limiting section 502, a mounting bracket section 503, a mounting bracket top limiting section 504, and a rotating shaft rotation drive section 505.

[0053] The rotating shaft mounting section 501 includes a cylindrical rotating shaft mounting section body 50101, which is inserted into the rotating shaft mounting hole 302 of the standard block. The rotating shaft mounting section body 50101 and the rotating shaft mounting hole 302 of the standard block are in clearance fit. A rotating shaft exhaust groove 50102 is also provided on the outer side wall of the rotating shaft mounting section body 50101 along the axial direction.

[0054] The outer diameter of the bottom shoulder limiting section 502 of the mounting bracket is greater than the diameter of the standard block shaft mounting hole 302, thereby limiting the axial movement of the shaft 5 within the standard block shaft mounting hole 302; the outer diameter of the bottom shoulder limiting section 502 of the mounting bracket is also greater than the outer diameter of the mounting bracket section 503, thereby limiting the axial lower end of the table mounting bracket 6 and the mounting bracket height adjustment ring 8.

[0055] As a preferred embodiment, the mounting bracket section 503 includes a long-axis-shaped mounting bracket section body 50301. A mounting bracket circumferential limiting keyway 50302 is provided along the axial direction on the outer side wall of the mounting bracket section body 50301. A mounting bracket circumferential limiting key 50303 is installed in the mounting bracket circumferential limiting keyway 50302. The watch mounting bracket 6 and the mounting bracket height adjustment ring 8 are both fitted on the mounting bracket section body 50301. The watch mounting bracket 6 and the mounting bracket height adjustment ring 8 are both circumferentially limited by the mounting bracket circumferential limiting key 50303.

[0056] The top limiting section 504 of the mounting bracket includes a cylindrical mounting bracket top limiting section body 50401. The outer side wall of the mounting bracket top limiting section body 50401 is provided with a mounting bracket top limiting section external thread 50402. The mounting bracket top limiting section body 50401 is connected to the mounting bracket top limiting nut 9 through the mounting bracket top limiting section external thread 50402, thereby achieving the axial upper limit of the mounting bracket 6 and the mounting bracket height adjustment ring 8.

[0057] The rotating shaft drive section 505 includes a cylindrical rotating shaft drive section body 50501. A radially penetrating handle mounting hole 50502 is provided on the rotating shaft drive section body 50501. A rotating shaft handle 10 is radially installed in the handle mounting hole 50502. The circumferential rotation of the measuring head 701 of the dial indicator 7 is realized by the circumferential rotation of the rotating shaft handle 10.

[0058] As a preferred embodiment of this invention, such as Figure 5 As shown, the watch mounting bracket 6 includes a horizontally arranged watch mounting bracket body 601. One end of the watch mounting bracket body 601 has a mounting bracket mounting hole 602 that passes through the watch mounting bracket body 601 and has a keyway. The watch mounting bracket body 601 is fitted onto the mounting bracket section 503 through the mounting bracket mounting hole 602.

[0059] The dial indicator mounting bracket body 601 has a vertically penetrating dial indicator fixing seat through hole 603 near the other end. The lower surface of the dial indicator mounting bracket body 601 near the other end is also integrally provided with a first dial indicator fixing seat 604. The second dial indicator fixing seat 702 at the bottom of the dial indicator 7 passes through the dial indicator fixing seat through hole 603. The second dial indicator fixing seat 702 and the first dial indicator fixing seat 604 are fastened together by the dial indicator fastening pin 11.

[0060] The upper surface of the other end of the dial indicator mounting bracket body 601 is also integrally provided with a dial indicator guide block 605. The upper surface of the dial indicator guide block 605 is provided with a dial indicator guide groove 606 that passes through the dial indicator guide block 605. The measuring head 701 of the dial indicator 7 passes through the dial indicator guide groove 606 for guidance and limiting.

[0061] As a preferred embodiment of this invention, such as Figure 6 As shown, the mounting bracket height adjustment ring 8 is in the shape of an annular block, and the mounting bracket height adjustment ring 8 is fitted onto the mounting bracket section 503.

[0062] The inner wall of the mounting bracket height adjustment ring 8 is also provided with an axially penetrating adjustment ring mounting keyway 12. The mounting bracket height adjustment ring 8 achieves circumferential limitation through the cooperation between the adjustment ring mounting keyway 12 and the mounting bracket circumferential limit key 50303.

[0063] As a preferred embodiment, the depth of the central hole at the center of the workpiece 4 being measured is equal to the depth of the standard block shaft mounting hole 302.

[0064] In this embodiment, the workpiece 4 to be measured is a workpiece with a known center and a segment of arc. The workpiece 4 to be measured adopts a commonly used workpiece to be measured in the art. The standard radius of the workpiece 4 to be measured adopts a commonly used standard radius of the workpiece to be measured in the art.

[0065] In this embodiment, the central angle between the fan-shaped chassis body 301 and the standard block radius measuring block 303 is greater than or equal to 90°.

[0066] In this embodiment, the axial direction of the mounting bracket 6 is the same as the axial direction of the rotating shaft 5, and the axial direction of the rotating shaft 5 is vertical; the horizontal direction is horizontal.

[0067] In this embodiment, the device is designed with a matching rotating shaft 5 based on the center hole at the center of the workpiece 4 being measured. The rotating shaft mounting section body 50101 of the rotating shaft 5 is clearance-fitted with the center hole at the center of the workpiece 4 being measured or the rotating shaft mounting hole 302 of the standard block, thereby realizing the rotation measurement of the measuring unit 1. The rotating shaft 5 is also provided with a rotating shaft exhaust groove 50102 to facilitate the insertion of the rotating shaft 5 into the center hole at the center of the workpiece 4 being measured or the rotating shaft mounting hole 302 of the standard block. The bottom shoulder limiting section 502 of the mounting bracket of the rotating shaft 5 is used to position the mounting bracket 6, and the circumferential limiting key 503 of the mounting bracket of the rotating shaft 5 is used. 03 is used to circumferentially limit the relative rotation between the rotating shaft 5, the watch mounting bracket 6, and the mounting bracket height adjustment ring 8; the top limiting section 504 of the mounting bracket of the rotating shaft 5 is designed with an external thread 50402, which is used to lock the watch mounting bracket 6 and the mounting bracket height adjustment ring 8 through the top limiting nut 9, preventing them from axially moving relative to the rotating shaft mounting section body 50101; a rotating shaft rotation handle 10 is installed in the handle mounting hole 50502 of the rotating shaft 5, which facilitates the rotation of the rotating shaft 5.

[0068] In this embodiment, the mounting bracket section 503 of the rotating shaft 5 is also fitted with a mounting bracket section 2, which is located at the lower axial end of the mounting bracket section 503.

[0069] In this embodiment, one end of the mounting bracket 6 is fitted onto the rotating shaft 5, and the connection and circumferential limitation are achieved through the circumferential limit key 50303 of the mounting bracket.

[0070] In this embodiment, the dial indicator 7 in the device is required to have a small structural size, such as... Figure 9 As shown, it has a connectable and fixed structure, such as the Mitutoyo 1003A dial indicator. The Mitutoyo 1003A dial indicator adopts the commonly known Mitutoyo 1003A dial indicator in this field; the stroke range of this dial indicator is 0 to 4 mm, and the graduation value is 0.01 mm, which can meet the usage requirements.

[0071] In this embodiment, the mounting bracket height adjustment ring 8 is used to adjust the height of the dial indicator mounting bracket 6 in the vertical direction. Different height arc radii can be measured by increasing or decreasing the number of mounting bracket height adjustment rings 8 at the bottom of the dial indicator mounting bracket 6. This embodiment has three mounting bracket height adjustment rings 8, each with a height of 11mm, enabling the measurement of arc radii in four height directions: 0mm, 11mm, 22mm, and 33mm. Initially, the measuring head 701 of the dial indicator 7 is in the vertical position (0 position), and there are no mounting bracket height adjustment rings 8 at the bottom of the dial indicator mounting bracket 6. Figure 8 As shown; the height adjustment rings 8 of each mounting bracket are also connected to the rotating shaft 5 via the keyway 12 of the adjustment ring mounting.

[0072] In this embodiment, the calibration unit is a sector-shaped standard block 3. The radius of the sector-shaped standard block 3 is equal to the standard radius of the workpiece 4 being measured, and the known radius of the inner side of the sector-shaped standard block 3 is R0. The arc area corresponding to the sector-shaped standard block 3 is large, and the corresponding central angle is greater than or equal to 90°.

[0073] The device in this embodiment specifically includes the following steps when in use: Step 1, adjust the measuring height: Before measurement, confirm the height of the arc segment of the workpiece 4 to be measured, install the corresponding number of mounting bracket height adjustment rings 8 under the mounting bracket 6, reinstall the measuring unit 1, and lock it with the top limit nut 9 of the mounting bracket.

[0074] Step 2: Calibrate measurement unit 1: Insert the shaft mounting section 50101 of the rotating shaft 5 into the standard block shaft mounting hole 302 of the sector standard block 3 (the radius of the inner side of the sector standard block 3 is known to be R0). Rotate the mounting bracket section 503 by rotating the shaft handle 10, thus rotating the dial indicator 7. The measuring head 701 of the dial indicator 7 measures the size of the inner side of the sector standard block 3. Observe the pointer jump of the dial indicator 7. Move the dial of the dial indicator 7 so that the pointer is aligned with the "0" mark on the dial. Observe the reading of the small dial of the dial indicator 7 and record it as W0.

[0075] Step 3: Measure the radius of the arc of the workpiece 4 being measured. like Figure 10 As shown, insert the rotating shaft mounting section body 50101 of the rotating shaft 5 into the center hole at the center of the workpiece 4 to be measured. Rotate the mounting bracket section 503 by rotating the rotating shaft handle 10. The measuring head 701 of the dial indicator 7 measures the distance from the arc end of the workpiece 4 to be measured. Observe the pointer jump of the dial indicator 7 and record the small scale reading W1 and the pointer reading Z of the dial indicator 7 (facing the dial indicator, the right side of the 0 mark is positive and the left side is negative). Then the radius corresponding to the arc of the workpiece 4 to be measured is: R0-(W1-W0)-Z.

[0076] Step 4: Confirm measurement results: Compare the measurement results with the standard radius required by the drawing. If the measurement result is smaller than the standard radius required by the drawing, adjust the tool compensation in time and continue processing until the measurement result reaches the standard radius required by the design drawing. Otherwise, it has exceeded the tolerance and the cause of the deviation needs to be analyzed and adjusted in time.

Claims

1. A large-size narrow arc radius measuring device, characterized in that, It includes a measurement unit (1) and a calibration unit; the calibration unit is a fan-shaped standard block (3), the fan-shaped standard block (3) includes a fan-shaped base body (301), the radius of the fan-shaped base body (301) is equal to the standard radius of the workpiece (4) being measured, and a vertically penetrating standard block shaft mounting hole (302) is also provided at the center of the fan-shaped base body (301), the diameter of the standard block shaft mounting hole (302) is equal to the diameter of the central hole at the center of the workpiece (4) being measured, and an arc-shaped standard block radius measuring block (303) is also integrally provided on the arc edge of the fan-shaped base body (301). The measuring unit (1) includes a rotating shaft (5), the lower axial end of which is installed in the rotating shaft mounting hole (302) of the standard block and can rotate circumferentially relative to the rotating shaft mounting hole (302); the measuring unit (1) also includes a horizontally arranged dial indicator mounting bracket (6), one end of which is fitted onto the middle section of the rotating shaft (5), the dial indicator mounting bracket (6) is limited circumferentially and radially by the rotating shaft (5), and a horizontally arranged dial indicator (7) is also installed on the dial indicator mounting bracket (6), the dial indicator (7) measures and calibrates the radius of the inner side of the sector standard block (3); The middle section of the rotating shaft (5) is also fitted with multiple mounting bracket height adjustment rings (8). The mounting bracket height adjustment rings (8) are arranged at the top or bottom of the meter mounting bracket (6). By increasing the number of mounting bracket height adjustment rings (8) at the bottom of the meter mounting bracket (6), the meter mounting bracket (6) is adjusted in the vertical position, thereby realizing the adjustment of the measuring head (701) of the dial indicator (7) in the vertical position. The measuring head (701) of the dial indicator (7) can also rotate circumferentially by rotating the upper end of the shaft (5), thereby enabling measurement of the standard block radius measuring block (303) at different circumferential positions.

2. The large-size narrow arc radius measuring device as described in claim 1, characterized in that, The rotating shaft (5) includes, from bottom to top along the axial direction, an integrally formed rotating shaft mounting section (501), a mounting bracket bottom shoulder limiting section (502), a mounting bracket section (503), a mounting bracket top limiting section (504), and a rotating shaft rotation drive section (505). The rotating shaft mounting section (501) includes a cylindrical rotating shaft mounting section body (50101), which is inserted into the standard block rotating shaft mounting hole (302). The rotating shaft mounting section body (50101) and the standard block rotating shaft mounting hole (302) are clearance-fitted. A rotating shaft exhaust groove (50102) is also provided on the outer side wall of the rotating shaft mounting section body (50101) along the axial direction. The outer diameter of the bottom shoulder limiting section (502) of the mounting bracket is larger than the diameter of the standard block shaft mounting hole (302), thereby achieving axial limiting of the shaft (5) within the standard block shaft mounting hole (302); the outer diameter of the bottom shoulder limiting section (502) of the mounting bracket is also larger than the outer diameter of the mounting bracket section (503), thereby achieving axial lower limit of the table mounting bracket (6) and the mounting bracket height adjustment ring (8).

3. The large-size narrow arc radius measuring device as described in claim 2, characterized in that, The mounting bracket section (503) includes a long-axis-shaped mounting bracket section body (50301). A mounting bracket circumferential limiting keyway (50302) is provided along the axial direction on the outer side wall of the mounting bracket section body (50301). A mounting bracket circumferential limiting key (50303) is installed in the mounting bracket circumferential limiting keyway (50302). The watch mounting bracket (6) and the mounting bracket height adjustment ring (8) are both fitted on the mounting bracket section body (50301). The watch mounting bracket (6) and the mounting bracket height adjustment ring (8) are both circumferentially limited by the mounting bracket circumferential limiting key (50303). The mounting bracket top limiting section (504) includes a cylindrical mounting bracket top limiting section body (50401). The outer side wall of the mounting bracket top limiting section body (50401) is provided with a mounting bracket top limiting section external thread (50402). The mounting bracket top limiting section body (50401) is connected to the mounting bracket top limiting nut (9) through the mounting bracket top limiting section external thread (50402), thereby realizing the axial upper end limiting of the mounting bracket (6) and the mounting bracket height adjustment ring (8). The rotating shaft drive section (505) includes a cylindrical rotating shaft drive section body (50501). A radially penetrating handle mounting hole (50502) is provided on the rotating shaft drive section body (50501). A rotating shaft handle (10) is installed radially inside the handle mounting hole (50502). The circumferential rotation of the measuring head (701) of the dial indicator (7) is realized by rotating the rotating shaft handle (10).

4. The large-size narrow arc radius measuring device as described in claim 3, characterized in that, The watch mounting bracket (6) includes a horizontally arranged watch mounting bracket body (601). One end of the watch mounting bracket body (601) is provided with a mounting bracket mounting hole (602) that passes through the watch mounting bracket body (601) and has a keyway. The watch mounting bracket body (601) is fitted onto the mounting bracket section (503) through the mounting bracket mounting hole (602). The meter mounting bracket body (601) is provided with a vertical through hole (603) for the dial indicator fixing seat near the other end. The lower surface of the meter mounting bracket body (601) near the other end is also integrally provided with a first dial indicator fixing seat (604). The second dial indicator fixing seat (702) at the bottom of the dial indicator (7) passes through the through hole (603) for the dial indicator fixing seat. The second dial indicator fixing seat (702) and the first dial indicator fixing seat (604) are fastened together by a dial indicator fastening pin (11). The upper surface of the other end of the mounting bracket body (601) is also integrally provided with a dial indicator guide block (605). The upper surface of the dial indicator guide block (605) is provided with a dial indicator guide groove (606) that passes through the dial indicator guide block (605). The measuring head (701) of the dial indicator (7) passes through the dial indicator guide groove (606) for guidance and positioning.

5. The large-size narrow arc radius measuring device as described in claim 3, characterized in that, The mounting bracket height adjustment ring (8) is in the shape of an annular block and is fitted onto the mounting bracket section (503). The inner wall of the mounting bracket height adjustment ring (8) is also provided with an axially penetrating adjustment ring mounting keyway (12). The mounting bracket height adjustment ring (8) achieves circumferential limitation through the cooperation between the adjustment ring mounting keyway (12) and the mounting bracket circumferential limit key (50303).

6. The large-size narrow arc radius measuring device as described in claim 1, characterized in that, The depth of the center hole at the center of the workpiece (4) being tested is equal to the depth of the standard block shaft mounting hole (302).

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