Gauge for measuring flange ring groove

Abstract

The utility model discloses a gage for measuring flange annular groove, including ruler body, fixed measuring component and movable measuring component, the measuring end of fixed measuring rod and movable measuring rod all stretch to the bottom outside of ruler body, and the measuring end of fixed measuring rod and movable measuring rod all are spherical end. The utility model utilizes the principle that the tangent of circle and straight line will produce only the point to make the measuring end of measuring rod and measuring surface form point contact, and through elastic spring piece, the small displacement variation of fixed measuring rod is converted into acting force and is passed to the dial gauge, and the indication increment of dial gauge is used to accurate embodiment, thereby can improve the measuring accuracy when the inside and outside diameter of flange annular groove is measured, in the utility model, the fixed measuring rod and movable measuring rod are all set up to can carry out the lift adjustment, and utilize the lock screw to lock fixed measuring rod, thereby can measure the inside and outside diameter size and angle value of any height position on flange sealing bevel.

Description

Technical Field

[0001] This utility model relates to the field of measuring tool technology, and in particular to a gauge for measuring flange annular grooves. Background Technology

[0002] In the measurement of flange annular grooves, the industry currently commonly uses vernier calipers or universal protractors. Vernier calipers utilize the principle of conformal measurement, with 23° angles on both sides of the caliper. They can only measure the inner and outer diameters of the flange annular groove end face, and are not convenient for measuring the inner and outer diameters at arbitrary heights of the sealing surface's inclined plane. Universal protractors can measure the angles of the flange sealing surface, but because the depth of the annular groove is not large, using a universal protractor for measurement is inconvenient, resulting in low accuracy of the measured values.

[0003] Utility model patent document CN219869386U discloses a measuring fixture, the technical solution of which includes a connecting rod, a first limiting component, a measuring instrument, and a second limiting component. The first limiting component is disposed at one end of the connecting rod and has a first abutting end. The second limiting component is slidably disposed at the other end of the connecting rod, with its measuring end in contact. The second limiting component has a second abutting end and is connected to the connecting rod via an elastic component. When measuring a deep annular groove, both the first and second abutting ends slide downwards along the height direction, allowing adjustment of their lengths to facilitate contact between the first and second abutting ends and two opposite positions within the annular groove. This utility model discloses a technical solution that allows the determination of the annular groove's dimensions through readings on the measuring instrument, facilitating the measurement of deep annular grooves. However, because the first and second abutting ends are perpendicular to the vertical adjusting rod, they can only abut against the sidewall of the annular groove from the side, making it inconvenient for measuring annular grooves with inclined walls. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a gauge for measuring flange annular grooves, which can improve the accuracy of measuring flange annular groove dimensions and facilitate the measurement of sealing bevel dimensions.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a gauge for measuring flange annular grooves, including a scale body, a fixed measuring component and a movable measuring component;

[0006] The ruler itself is a horizontally positioned long strip structure;

[0007] The fixed measuring component is fixedly installed at one end of the ruler body, and the movable measuring component is installed at the other end of the ruler body and can slide along the length of the ruler body;

[0008] The fixed measuring assembly includes a fixed measuring rod, a fixed measuring rod seat, a connecting block, elastic springs, a measuring screw, and a dial indicator. The fixed measuring rod is perpendicular to the scale body and is mounted on the fixed measuring rod seat. The connecting block is fixedly connected to the scale body. The fixed measuring rod seat is connected to the connecting block through multiple vertically arranged elastic springs. The measuring screw is parallel to the scale body and is fixedly connected to the fixed measuring rod seat. The measuring screw abuts against the end of the dial indicator rod.

[0009] The movable measuring assembly includes a movable measuring rod and a movable measuring frame. The movable measuring rod is perpendicular to the scale body and is mounted on the movable measuring frame. The movable measuring frame slides in conjunction with the scale body.

[0010] The measuring ends of both the fixed and movable measuring rods extend downwards to the bottom of the ruler, and both measuring ends are spherical.

[0011] As an improvement to the above solution: the fixed measuring assembly further includes a limiting rod, a limiting rod seat, and a fixing frame; the limiting rod seat is fixedly connected to the fixed measuring rod seat, the measuring screw is fixedly connected to the limiting rod seat, the connecting block is fixedly connected to the fixing frame, and the fixing frame is fixedly connected to the ruler body; the limiting rod is vertically set and fixedly connected to the limiting rod seat, the fixing frame is provided with a limiting gap that limits the limiting rod along the length of the ruler body, and the connecting block and the bottom of the ruler body are also provided with limiting gaps that limit the fixed measuring rod along the length of the ruler body.

[0012] As an improvement to the above solution, a limiting block is also included. The limiting block is provided with a limiting groove, which is composed of an outer diameter measuring limiting groove and an inner diameter measuring limiting groove connected together. The inner diameter measuring limiting groove is offset towards the dial indicator, and the outer diameter measuring limiting groove is offset towards the direction away from the dial indicator. The limiting block is detachably fixed to the fixing frame by a limiting locking screw, and the end of the limiting rod that is not connected to the limiting rod seat extends upward through the limiting groove.

[0013] As an improvement to the above solution: the top of the fixing frame is provided with a translation groove that matches the limiting block. The limiting block limits the limiting block in the length direction of the ruler body, and the limiting block can translate in the width direction of the ruler body.

[0014] As an improvement to the above solution, it also includes an open sleeve fixed to the front end of the mounting bracket, through which the end of the dial indicator rod passes and abuts against the measuring screw, forming a clearance fit between the open sleeve and the end of the dial indicator rod; it also includes a protective sleeve fixed to the scale body and located in front of the mounting bracket, in which the dial indicator is fixed, and the top of the protective sleeve has an opening for observing the dial indicator reading.

[0015] As an improvement to the above solution: the movable measuring component further includes a locking block and a locking screw; the locking screw is threadedly connected to the locking block and the movable measuring frame, and the locking block and the movable measuring frame can be locked and fixed to the ruler body by the locking screw.

[0016] As an improvement to the above solution: the two sides of the locking block are bent downward to form limiting edges, and the limiting edges on both sides of the locking block are respectively snapped onto the outside of the two sides of the ruler body to form a limiting fit in the width direction of the ruler body.

[0017] As an improvement to the above solution: the fixed measuring rod can be vertically raised and lowered relative to the fixed measuring rod base, and is locked and fixed to the fixed measuring rod base by a lifting set screw; the movable measuring rod can be vertically raised and lowered relative to the movable measuring frame, and is locked and fixed to the movable measuring frame by a first conical end set screw and a second conical end set screw.

[0018] As an improvement to the above solution: the ruler body is a hollow elongated strip structure with a rectangular cross-section. The top of the ruler body is provided with an upper sliding groove that fits with the upper part of the movable measuring rod with a clearance, and the bottom of the ruler body is provided with a lower sliding groove that fits with the lower part of the movable measuring rod with a clearance.

[0019] The beneficial effects of this utility model are as follows: By setting the ends of both the fixed measuring rod in the fixed measuring assembly and the movable measuring rod in the movable measuring assembly to be spherical, this utility model utilizes the principle that a circle and a straight line will produce a unique tangent point, allowing the measuring end of the measuring rod to form point contact with the measuring surface. A spring is used to convert the small displacement of the fixed measuring rod into a force that is transmitted to the dial indicator, and the incremental reading of the dial indicator accurately reflects this force. This effectively improves the measurement accuracy when measuring the inner and outer diameters of the flange annular groove. Furthermore, this utility model allows both the fixed and movable measuring rods to be height-adjustable and secured with set screws, enabling the measurement of the inner and outer diameter dimensions and angle values ​​at any height on the flange sealing slope. Attached Figure Description

[0020] Figure 1 This is an isometric view of the present invention;

[0021] Figure 2 This is a front sectional view of the present invention;

[0022] Figure 3 A cross-sectional view of the fixed measuring component;

[0023] Figure 4 Axonometric drawing of a fixed measuring component;

[0024] Figure 5 Axonometric drawing of the active measurement component;

[0025] Figure 6An axonometric drawing of the ruler;

[0026] Figure 7 A schematic diagram of the fit between the limiting rod and the limiting block when measuring the inner diameter of the flange annular groove;

[0027] Figure 8 A schematic diagram of the fit between the limiting rod and the limiting block when measuring the outer diameter of the flange annular groove;

[0028] Figure 9 This is a schematic diagram for measuring the inner diameter of the flange annular groove.

[0029] Figure 10 This is a schematic diagram for measuring the outer diameter of the flange annular groove.

[0030] The markings in the diagram are as follows: 100-Scale body, 110-Upper slide groove, 120-Lower slide groove, 200-Fixed measuring component, 210-Fixed measuring rod, 220-Fixed measuring rod seat, 221-Lifting set screw, 230-Connecting block, 240-Elastic spring, 251-Measuring screw, 252-Dial indicator, 253-Open sleeve, 254-Protective sleeve, 260-Limiting rod, 270-Limiting rod seat, 280-Fixed frame, 290-Limiting block, 291-Limiting groove, 292-Limiting locking screw, 300-Modible measuring component, 310-Modible measuring rod, 320-Modible measuring frame, 330-Locking block, 331-Locking screw, 341-First cone end set screw, 342-Second cone end set screw. Detailed Implementation

[0031] To facilitate understanding of this utility model, the following description, in conjunction with the accompanying drawings, will provide further details.

[0032] In the description of this utility model, it should be noted that the terms "front", "rear", "left", "right", "up", "down", "inner", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of description and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0033] like Figure 1 and Figure 2As shown, the gauge for measuring flange annular groove disclosed in this utility model consists of a scale body 100, a fixed measuring component 200, and a movable measuring component 300; the fixed measuring component 200 is fixedly installed at one end of the scale body 100, and the movable measuring component 300 is movably installed at the other end of the scale body 100, and the movable measuring component 300 can slide along the length direction of the scale body 100. The fixed measuring component 200 is provided with a fixed measuring rod 210, and the movable measuring component 300 is provided with a movable measuring rod 310. One end of both the fixed measuring rod 210 and the movable measuring rod 310 extends beyond the bottom of the ruler body 100, and this end is the measuring end. The measuring ends of both the fixed measuring rod 210 and the movable measuring rod 310 are spherical. Furthermore, the fixed measuring rod 210 is movably connected to the fixed measuring component 200, and the movable measuring rod 310 is movably connected to the movable measuring component 300. With the ruler body 100 set horizontally as a reference, both the fixed measuring rod 210 and the movable measuring rod 310 can be adjusted vertically up and down relative to the ruler body 100.

[0034] Specifically, such as Figures 2 to 4As shown, the fixed measuring assembly 200 includes a fixed measuring rod 210, a fixed measuring rod base 220, a connecting block 230, elastic springs 240, a measuring screw 251, a dial indicator 252, a limiting rod 260, a limiting rod base 270, and a fixing frame 280. The fixed measuring rod 210 is mounted on the fixed measuring rod base 220, which has a mounting through hole for mounting the fixed measuring rod 210. The connecting block 230 is fixedly connected to the scale body 100, and the connecting block 230 is connected to the fixed measuring rod base 220 by multiple elastic springs 240. The measuring screw 251 is fixed on the fixed measuring rod seat 220. The measuring screw 251 is set horizontally parallel to the scale body 100. The dial indicator 252 is fixed on the fixed measuring assembly 200. The end of the dial indicator 252 abuts against the measuring screw 251. The spherical end of the dial indicator 252 and the end face of the measuring screw 521 are pre-compressed by a spring. The limiting rod seat 270 is fixedly connected to the fixed measuring rod seat 220. The measuring screw 251 is fixedly connected to the limiting rod seat 270. The connecting block 230 is fixedly connected to the fixing frame 280, and the fixing frame 280 is fixedly connected to the ruler body 100. The limiting rod 260 is vertically set and fixedly connected to the limiting rod seat 270. The fixing frame 280 is provided with a limiting gap that limits the limiting rod 260 along the length direction of the ruler body 100. The connecting block 230 and the bottom of the ruler body 100 are provided with limiting gaps that limit the fixed measuring rod 210 along the length direction of the ruler body 100. The upper and lower limiting gaps are the same size. The upper end of the fixed measuring rod 210 passes through the limiting gap on the connecting block 230, and the lower end of the fixed measuring rod 210 passes through the limiting gap on the ruler body 100. The fixed measuring rod 210 has a small range of displacement under the limitation of the limiting gap. Since the fixed measuring rod seat 220 is connected to the connecting block 230 through the spring sheet 240, and the fixed measuring rod seat 220 and the limiting rod seat 270 are connected as a whole, when the fixed measuring rod 210 installed on the fixed measuring rod seat 220 produces a small radial displacement within the range limited by the limiting gap, it will drive the limiting rod 260 to move synchronously and cause the elastic spring sheet 250 to undergo elastic deformation, thereby transmitting the force to the dial indicator 252 through the measuring screw 251, and the reading of the dial indicator 252 can be read.

[0035] like Figure 3 and Figure 4As shown, the fixed measuring assembly 200 also includes a limiting block 290, which has a limiting groove 291 that mates with the limiting rod 260. The limiting groove 291 consists of an outer diameter measuring limiting groove and an inner diameter measuring limiting groove connected together. The inner diameter measuring limiting groove is offset towards the dial indicator 252, and the outer diameter measuring limiting groove is offset away from the dial indicator 252. The limiting block 290 is detachably fixed to the fixing frame 280 by a limiting locking screw 292. The end of the limiting rod 260 not connected to the limiting rod seat 270 extends upward through the limiting groove 291. By tightening the limiting locking screw 292, the limiting block 290 is locked to the fixing frame 280, thus fixing the limiting block 290. The position of the limiting block 290 can be adjusted after loosening the limiting locking screw 292 to allow different parts of the limiting rod and the limiting groove 291 to engage. Figure 8 As shown, when measuring the inner diameter of the flange annular groove, the limiting block 290 is moved so that the limiting rod 260 is located in the inner diameter measuring limiting groove, and then the limiting locking screw 292 is tightened to fix the limiting block 290 on the fixing bracket 280. Figure 8 As shown, when measuring the outer diameter of the flange annular groove, the limiting block 290 is moved so that the limiting rod 260 is located in the outer diameter measuring limiting groove, and then the limiting locking screw 292 is tightened to fix the limiting block 290 on the fixing frame 280.

[0036] Furthermore, such as Figures 1 to 3 As shown, in order to further improve the fixing effect of the limiting block 290 on the fixing frame 280, this utility model adds a translation groove to the top of the fixing frame 280. The width of the translation groove is adapted to the width of the limiting block 290. Both ends of the translation groove are open ends. The limiting block 290 forms a limit on the length of the ruler body 100. The limiting block 290 can be translated in the width direction of the ruler body 100, but cannot move in the length direction of the ruler body 100.

[0037] Furthermore, such as Figure 2 and Figure 3 As shown, this utility model has a horizontal through hole at the front end of the fixing frame 280, and an open sleeve 253 is fixedly installed in the horizontal through hole. The open sleeve 253 is tightly fitted with the horizontal through hole of the fixing frame 280. The end of the dial indicator 252 passes through the open sleeve 253 and abuts against the measuring screw 251. The open sleeve 253 and the end of the dial indicator 252 form a clearance fit. It also includes a protective sleeve 254 fixed on the ruler body 100 and located in front of the fixing frame 280. The dial indicator 252 is fixed in the protective sleeve 254. The top of the protective sleeve 254 is provided with an opening for observing the reading of the dial indicator 252.

[0038] Specifically, such as Figure 1 , Figure 2 and Figure 5 As shown, the movable measuring assembly 300 includes a movable measuring rod 310, a movable measuring frame 320, a locking block 330, and a locking screw 331. The movable measuring frame 320 slides with the ruler body 100 so that the entire movable measuring assembly 300 can slide along the length of the ruler body 100. A through hole adapted to the movable measuring rod 310 is vertically provided on the movable measuring frame 320 to realize the installation of the movable measuring rod 310, so that the movable measuring rod 310 is set perpendicular to the ruler body 100. The locking screw 331 and the movable measuring frame 320 are both threadedly connected to the locking screw 331. The locking block (330) and the movable measuring frame 320 can be locked and fixed on the ruler body 100 by the locking screw 331. This invention bends the two sides of the locking block 330 downward to form limiting edges, so that the limiting edges on both sides of the locking block 330 are respectively snapped onto the outside of the two sides of the ruler body 100 to form a limiting fit in the width direction of the ruler body 100, so as to prevent the movable measuring component 300 from shifting during the sliding process along the ruler body 100.

[0039] To enable the measurement of dimensions and angles at different heights of the sealing slope on the flange annular groove, this invention configures both the fixed measuring rod 210 and the movable measuring rod 310 as liftable structures. For example... Figure 2 and Figure 3 As shown, the fixed measuring rod 210 can be vertically raised and lowered relative to the fixed measuring rod base 220, and is locked and fixed to the fixed measuring rod base 220 by the lifting set screw 221. When it is necessary to adjust the height of the fixed measuring rod 210, simply loosen the lifting set screw 221. Figure 2 and Figure 5 As shown, the movable measuring rod 310 can be vertically raised and lowered relative to the movable measuring frame 320, and is locked and fixed to the movable measuring frame 320 by the cooperation of the first conical end set screw 341 and the second conical end set screw 342; the first conical end set screw 341 is vertically set and threadedly connected to the movable measuring frame 320, the second conical end set screw 342 is horizontally set and threadedly connected to the movable measuring frame 320, the ends of the first conical end set screw 341 and the second conical end set screw 342 abut against each other, the first conical end... Both the set screw 341 and the second tapered set screw 342 have tapered ends. When the first tapered set screw 341 is tightened, the tapered surface of the first tapered set screw 341 will press against the tapered end of the second tapered set screw 342, so that the second tapered set screw 342 moves in the radial direction of the movable measuring rod 310 and presses the movable measuring rod 310. When it is necessary to adjust the height of the movable measuring rod 310, the first tapered set screw 341 can be loosened.

[0040] like Figure 1 , Figure 2 and Figure 6As shown, the ruler body 100 in this utility model is a hollow elongated strip structure with a rectangular cross-section, and the ruler body 100 is set horizontally. The top of the ruler body 100 is provided with an upper sliding groove 110 that is in clearance fit with the upper part of the movable measuring rod 310, and the bottom of the ruler body 100 is provided with a lower sliding groove 120 that is in clearance fit with the lower part of the movable measuring rod 310. The ruler body 100 guides and limits the movable measuring rod 310 through the upper sliding groove 110 and the lower sliding groove 120, so as to limit the sliding of the movable measuring component 300 as a whole.

[0041] When assembling the gauge for measuring flange annular grooves disclosed in this utility model, the assembly work shall be carried out according to the following steps:

[0042] Step 1: Assemble the connecting block 230, the fixed measuring rod seat 220 and the elastic spring 240, and use 8 spring washers and 8 hex socket head cap screws to connect and tighten them in place.

[0043] Step 2: Install the limit rod 260, measuring screw 251 and limit rod seat 270 by hammering them in with an interference fit. Then, use two internal hexagon head screws to connect and tighten the limit rod seat 270 to the fixed measuring rod seat 220.

[0044] Step 3: Place the fixed measuring rod 210 into the through hole of the fixed measuring rod seat 220 to make the fixed measuring rod 210 and the fixed measuring rod 210 have a clearance fit. Use the lifting set screw 221 to lock the fixed measuring rod 210 so that it cannot move up and down.

[0045] Step 4: Place the assembled parts into the ruler body 100, and use four hexagon socket head cap screws to connect and secure the fixing bracket 280 to the ruler body 100. Install the opening sleeve 253 in the horizontal through hole at the front end of the fixing bracket 280, so that the end face of the opening sleeve 253 is flush with the end face of the fixing bracket 280.

[0046] Step 5: Lift the fixed measuring rod 210 upwards, and use hex socket flat head screws to connect and tighten the fixing bracket 280 to the connecting block 230.

[0047] Step 6: Install the two long cylinders into the grooves of the cylinder base, ensuring an interference fit between the long cylinders and the grooves of the cylinder base. Then, use hex socket head cap screws to connect and secure the cylinder base to the bottom of the ruler body 100.

[0048] Step 7: Place the movable measuring rod 310 into the through hole of the movable measuring frame 320 to make a clearance fit between the movable measuring rod 310 and the movable measuring frame 320. Then, place the second conical end set screw 342 into the horizontal through hole of the movable measuring frame 320 and use the first conical end set screw 341 to tighten it until the movable measuring rod 310 can no longer move up and down.

[0049] Step 8: Place the movable measuring frame 320 into the ruler body 100, install the locking block 330 on the top of the ruler body 100, and use the locking screw 331 to connect and secure the locking block 330 to the movable measuring frame 320.

[0050] Step 9: Use four hex socket countersunk screws to secure the protective sleeve 254 to the ruler body 100.

[0051] Step 10: Insert the terminal rod of the dial indicator 252 into the open sleeve 253, adjust the dial preload value of the dial indicator 252 so that the small pointer of the dial indicator 252 indicates the middle value of the range, and then screw the internal hexagonal set screw into the upper part of the fixing bracket 280 until the dial indicator 252 can no longer move laterally.

[0052] When measuring the inner diameter of a flange annular groove using the gauge disclosed in this utility model, the following steps shall be followed:

[0053] Step 1: Determine the preload value of dial indicator 252. Select the range of dial indicator 252 in the range of 0 to 6 mm. Set the small pointer of dial indicator 252 to the middle value of the range so that the dial of dial indicator 252 has a variable range of 3 mm in both clockwise and counterclockwise directions. Then, fine-tune the large pointer of dial indicator 252 to zero.

[0054] Step 2: Loosen the locking screw 331 to allow the movable measuring frame 320 to slide along the ruler body 100; place the gauge on the flange end face to be inspected, so that the fixed measuring rod 210 and the movable measuring rod 310 are placed in the flange groove in their natural state, with the bottom ends of the two measuring rods contacting the bottom surface of the annular groove, and tighten the corresponding screws so that the fixed measuring rod 210 and the movable measuring rod 310 cannot move in the vertical direction.

[0055] Step 3: Determine the location of the dimension range to be measured; slightly rotate the movable measuring frame 320 in the circumferential direction of the annular groove. Get as close as possible to the true value of the inner diameter to be measured, and then tighten the locking screw 331 until the movable measuring frame 320 does not move in any direction on the scale body 100.

[0056] Step 4: Remove the gauge and use an outside micrometer to check the distance between the fixed measuring rod 210 and the movable measuring rod 310. The value should be accurate to three decimal places.

[0057] Step 5: Recheck the dial indicator pointers again, ensuring that the small pointer of dial indicator 252 indicates the middle value of the range and the large pointer is zero; loosen the screws tightening the limit block 290, and adjust the position of the limit block 290 so that the limit rod 260 moves into the inner diameter measuring limit groove of the limit groove 291 and is in contact with the groove wall, so that the limit rod 260 does not move in the direction of the moving measuring component 300.

[0058] Step 6: Place the gauge back into the flange annular groove to be tested, and rotate the fixed measuring component 200 at a small angle in the circumferential direction of the flange annular groove to obtain the maximum value of the inner diameter. The fixed measuring rod 210 transmits the force to the end face of the measuring screw 251 under the action of the elastic spring 240, causing the measuring head of the dial indicator 252 to change the force reading. Read the reading e1 of the dial indicator 252 at this time.

[0059] Step 7, according to... Figure 9 We know the following relationship:

[0060] A1=B1-2(H1-a1)tan23°, B1=C1-2R-2Rcos23°;

[0061] The above relationship is derived as A1 = C1 - 2R - 2Rcos23° - 2(H1 - a1)tan23°. Substituting the known conditions and function values ​​into the relationship and simplifying, we get A1 = C1 - 0.848H1 - 21.103. The final dimension required for measurement is D1 = A1 + e1. The final relationship is D1 = C1 - 0.848H1 - 21.103 + e1.

[0062] In the formula, A1 is the inner diameter of the flange annular groove calculated from the diagram, B1 is the diameter between the tangent points of the spherical ends of the two measuring rods and the sealing slope of the annular groove, C1 is the maximum distance between the two measuring rods determined before measurement based on the annular groove dimensions, D1 is the actual outer diameter of the flange annular groove end face, H1 is the depth of the annular groove, R is the radius of the spherical end of the measuring rod, a1 is the distance from the tangent point of the spherical end of the measuring rod and the sealing slope to the bottom of the groove, and e1 is the increment of the dial indicator reading. Among these, C1, H1, and R are known values, which, when substituted into the formula, yield a value accurate to three decimal places, which is the inner diameter of the flange annular groove.

[0063] When measuring the outer diameter of a flange annular groove using the gauge disclosed in this utility model, the following steps shall be followed:

[0064] Step 1: Determine the preload value of dial indicator 252. Select the range of dial indicator 252 in the range of 0 to 6 mm. Set the small pointer of dial indicator 252 to the middle value of the range so that the dial of dial indicator 252 has a variable range of 3 mm in both clockwise and counterclockwise directions. Then, fine-tune the large pointer of dial indicator 252 to zero.

[0065] Step 2: Loosen the locking screw 331 to allow the movable measuring frame 320 to slide along the ruler body 100; place the gauge on the flange end face to be inspected, so that the fixed measuring rod 210 and the movable measuring rod 310 are placed in the flange groove in their natural state, with the bottom ends of the two measuring rods contacting the bottom surface of the annular groove, and tighten the corresponding screws so that the fixed measuring rod 210 and the movable measuring rod 310 cannot move in the vertical direction.

[0066] Step 3: Determine the location of the dimension range to be measured; slightly rotate the movable measuring frame 320 in the circumferential direction of the annular groove. Get as close as possible to the true value of the outer diameter to be measured, and then tighten the locking screw 331 until the movable measuring frame 320 does not move in any direction on the scale body 100.

[0067] Step 4: Remove the gauge and use an outside micrometer to check the distance between the fixed measuring rod 210 and the movable measuring rod 310. The value should be accurate to three decimal places.

[0068] Step 5: Recheck the dial indicator pointers again, ensuring that the small pointer of dial indicator 252 indicates the middle value of the range and the large pointer is zero; loosen the screws tightening the limit block 290, and adjust the position of the limit block 290 so that the limit rod 260 moves into the outer diameter measuring limit groove of the limit groove 291 and is in contact with the groove wall, so that the limit rod 260 does not move away from the moving measuring component 300.

[0069] Step 6: Place the gauge back into the flange annular groove to be tested, and rotate the fixed measuring component 200 at a small angle in the circumferential direction of the flange annular groove to obtain the maximum value of the outer diameter. The fixed measuring rod 210 transmits the force to the end face of the measuring screw 251 under the action of the elastic spring 240, causing the measuring head of the dial indicator 252 to change the force reading. Read the reading e2 of the dial indicator 252 at this time.

[0070] Step 7, according to... Figure 10 We know the following relationship:

[0071] A2=B2+2(H2-a2)tan23°, B2=C2+2R+2Rcos23°;

[0072] The above relationship is derived as A2 = C2 - 2R + 2Rcos23° + 2(H2 - a2)tan23°. Substituting the known conditions and function values ​​into the relationship and simplifying, we get A2 = C2 + 0.848H2 + 21.103. The final dimension required for measurement is D2 = A2 - e2. The final relationship is D2 = C2 + 0.848H2 + 21.103 - e2.

[0073] In the formula, A2 is the outer diameter of the flange annular groove calculated as shown in the figure, B2 is the diameter between the tangent points of the spherical ends of the two measuring rods and the sealing slope of the annular groove, C2 is the minimum distance between the two measuring rods determined before measurement based on the size of the annular groove, D2 is the actual inner diameter of the flange annular groove end face, H2 is the depth of the annular groove, R is the radius of the spherical end of the measuring rod, a2 is the distance from the tangent point of the spherical end of the measuring rod and the sealing slope to the bottom surface of the groove, and e2 is the increment of the dial indicator reading; where C2, H2, and R are known values, substituting them into the formula will yield a value accurate to three decimal places, which is the outer diameter of the flange annular groove.

Claims

1. A gauge for measuring the annular groove of a flange, characterized in that: It includes a ruler body (100), a fixed measuring component (200), and a movable measuring component (300); The ruler body (100) is a horizontally positioned elongated strip structure; The fixed measuring component (200) is fixedly installed at one end of the ruler body (100), and the movable measuring component (300) is installed at the other end of the ruler body (100) and can slide along the length of the ruler body (100); The fixed measuring assembly (200) includes a fixed measuring rod (210), a fixed measuring rod seat (220), a connecting block (230), an elastic spring (240), a measuring screw (251), and a dial indicator (252). The fixed measuring rod (210) is perpendicular to the scale body (100) and is mounted on the fixed measuring rod seat (220). The connecting block (230) is fixedly connected to the scale body (100). The fixed measuring rod seat (220) is connected to the connecting block (230) through multiple vertically arranged elastic springs (240). The measuring screw (251) is parallel to the scale body (100) and is fixedly connected to the fixed measuring rod seat (220). The measuring screw (251) abuts against the end of the dial indicator (252). The movable measuring assembly (300) includes a movable measuring rod (310) and a movable measuring frame (320). The movable measuring rod (310) is perpendicular to the ruler (100) and is mounted on the movable measuring frame (320). The movable measuring frame (320) is slidably engaged with the ruler (100). The measuring ends of both the fixed measuring rod (210) and the movable measuring rod (310) extend downwards to the bottom of the ruler (100), and the measuring ends of both the fixed measuring rod (210) and the movable measuring rod (310) are spherical.

2. The gauge for measuring flange annular grooves as described in claim 1, characterized in that: The fixed measuring assembly (200) also includes a limiting rod (260), a limiting rod seat (270), and a fixing frame (280); the limiting rod seat (270) is fixedly connected to the fixed measuring rod seat (220), the measuring screw (251) is fixedly connected to the limiting rod seat (270), the connecting block (230) is fixedly connected to the fixing frame (280), and the fixing frame (280) is fixedly connected to the ruler body (100); the limiting rod (260) is vertically set and fixedly connected to the limiting rod seat (270), the fixing frame (280) is provided with a limiting gap that limits the limiting rod (260) along the length direction of the ruler body (100), and the connecting block (230) and the bottom of the ruler body (100) are provided with a limiting gap that limits the fixed measuring rod (210) along the length direction of the ruler body (100).

3. The gauge for measuring flange annular grooves as described in claim 2, characterized in that: It also includes a limiting block (290), on which a limiting groove (291) is provided. The limiting groove (291) is composed of an outer diameter measuring limiting groove and an inner diameter measuring limiting groove connected together. The inner diameter measuring limiting groove is offset toward the direction close to the dial indicator (252), and the outer diameter measuring limiting groove is offset toward the direction away from the dial indicator (252). The limiting block (290) is detachably fixed to the fixing frame (280) by a limiting locking screw (292). The end of the limiting rod (260) that is not connected to the limiting rod seat (270) extends upward through the limiting groove (291).

4. The gauge for measuring flange annular grooves as described in claim 3, characterized in that: The top of the fixed frame (280) is provided with a translation groove that is adapted to the limiting block (290). The limiting block (290) forms a limit on the limiting block (290) in the length direction of the ruler (100), and the limiting block (290) can be translated in the width direction of the ruler (100).

5. The gauge for measuring flange annular grooves as described in claim 2, characterized in that: It also includes an open sleeve (253) fixed to the front end of the mounting bracket (280), the end of the dial indicator (252) passes through the open sleeve (253) and abuts against the measuring screw (251), and the open sleeve (253) and the end of the dial indicator (252) form a clearance fit; it also includes a protective sleeve (254) fixed on the scale body (100) and located in front of the mounting bracket (280), the dial indicator (252) is fixed in the protective sleeve (254), and the top of the protective sleeve (254) is provided with an opening for observing the reading of the dial indicator (252).

6. The gauge for measuring flange annular grooves as described in claim 1, characterized in that: The movable measuring assembly (300) also includes a locking block (330) and a locking screw (331); the locking screw (331) is threadedly connected to the locking block (330) and the movable measuring frame (320), and the locking block (330) and the movable measuring frame (320) can be locked and fixed on the ruler body (100) by the locking screw (331).

7. The gauge for measuring flange annular grooves as described in claim 6, characterized in that: The two sides of the locking block (330) are bent downward to form limiting edges. The limiting edges on both sides of the locking block (330) are respectively snapped onto the outside of the ruler body (100) to form a limiting fit in the width direction of the ruler body (100).

8. The gauge for measuring flange annular grooves as described in claim 1, characterized in that: The fixed measuring rod (210) can be vertically raised and lowered relative to the fixed measuring rod base (220) and locked and fixed on the fixed measuring rod base (220) by the lifting set screw (221); the movable measuring rod (310) can be vertically raised and lowered relative to the movable measuring frame (320) and locked and fixed on the movable measuring frame (320) by the cooperation of the first cone end set screw (341) and the second cone end set screw (342).

9. The gauge for measuring flange annular grooves as described in claim 1, characterized in that: The ruler body (100) is a hollow strip structure with a rectangular cross section. The top of the ruler body (100) is provided with an upper groove (110) that is in clearance fit with the upper part of the movable measuring rod (310), and the bottom of the ruler body (100) is provided with a lower groove (120) that is in clearance fit with the lower part of the movable measuring rod (310).

Images