Gauge for measuring diameter of boss in groove of part

Abstract

A testing fixture for measuring the diameter of a boss in a part groove comprises a guide seat and a dial indicator, the guide seat is a hollow cylinder, the lower end of the guide seat is provided with a small-diameter section used for being inserted into a shaft hole of a measured part, one diameter in the middle of the guide seat is provided with two through holes penetrating through the side wall, and a sliding rod penetrates through the two through holes to be in sliding fit with the guide seat. The middle section of the sliding rod is fixedly provided with a wedge-shaped sleeve, the wedge-shaped sleeve is positioned in an inner cavity of the guide seat, the front end and the rear end of the sliding rod respectively extend out of the guide seat, the front end is provided with a vertically downward first measuring head, the rear end is sleeved with a return spring, the return spring is arranged in a spring seat, and the spring seat is fixedly connected with the sliding rod. The left side and the right side of the lower part of the guide seat are symmetrically provided with radial extension arms, the two radial extension arms are respectively provided with a vertically downward positioning pin, the upper part of the guide seat is fixedly connected with a gauge stand, the dial gauge is arranged on the gauge stand, and a measuring rod of the dial gauge penetrates through the gauge stand downwards and corresponds to the wedge-shaped sleeve.

Description

Technical Field

[0001] The invention relates to a gauge for measuring the diameter of a part, in particular to a gauge for measuring the diameter of a boss in a groove of a part. Background Art

[0002] During the processing of the boss inside the part, due to the narrow gap between the ring groove of the part, the general measuring tool cannot effectively detect it. The conventional means can only be detected by a three-coordinate measuring machine. As a high-precision measuring equipment, the three-coordinate measuring machine has high requirements on the environment and needs to be configured with a special room to ensure the temperature, humidity and other environmental factors. The cost is high, and the detection time of the three-coordinate measuring machine is long, the speed is slow, and the efficiency is low. It can only perform random inspections on parts and cannot meet the requirements of all parts detection, resulting in uncontrollable processing quality.

[0003] There is a need for a gauge that can quickly detect the diameter of the boss in the groove of a part, such as a gauge for a ring boss disclosed in CN113587768A, and its detection method and use. The gauge includes an upper die assembly, a lower die assembly, and a ring boss. The ring boss includes a cylindrical body and a support layer. A fixing groove is provided on one side surface of the cylindrical body, and the other side surface is connected to the support layer. A cylindrical protrusion with a middle through structure is provided at the bottom of the fixing groove. The ring boss is placed in the upper die assembly, and then the upper die assembly with the ring boss is buckled on the lower die assembly. If the upper die assembly and the lower die assembly are fully matched, the detection result is qualified, and then the diameter of the cylindrical protrusion and the dimensions of the ring boss are measured manually with a caliper. However, this type of ring boss inspection fixture and its inspection method have the following disadvantages: the height of the cylindrical protrusion on the ring boss is 0.4 to 0.6 mm higher than the height of the cylindrical body of the ring boss. When the height of the cylindrical protrusion on the ring boss is lower than the height of the cylindrical body of the ring boss, it is impossible to manually measure the diameter of the cylindrical protrusion with a caliper. Manual measurement is prone to inconsistent measurement techniques, resulting in errors in readings, and manual measurement speed is slow. For mass production, it may not meet the requirements of production progress. Summary of the invention

[0004] The purpose of the present invention is to provide a gauge for measuring the diameter of a boss inside a part groove in response to the corresponding deficiencies in the prior art. The gauge has a simple structure, low environmental requirements, is easy to calibrate, does not require manual measurement with a caliper, has a high detection speed, and can effectively meet the rapid detection requirements of the boss processing process inside the part.

[0005] The object of the present invention is to adopt the following scheme to achieve: a gauge for measuring the diameter of the boss in the groove of a part, comprising a guide seat and a micrometer, wherein the guide seat is a hollow cylinder, the lower end of the guide seat is provided with a small diameter section for inserting into the axial hole of the measured part, two through holes penetrating the side wall are provided on a diameter in the middle of the guide seat, a sliding rod passes through the two through holes and slides with the guide seat, a wedge sleeve is fixedly provided in the middle section of the sliding rod, the wedge sleeve is located in the inner cavity of the guide seat, the front and rear ends of the sliding rod extend out of the guide seat respectively, and a vertically extending sleeve is provided at the front end The first measuring head below has a return spring sleeved at the rear end, the return spring is in the spring seat, the spring seat is fixedly connected to the sliding rod, radial extension arms are symmetrically arranged on the left and right sides of the lower part of the guide seat, and each of the two radial extension arms is equipped with a vertically downward positioning pin, and the two positioning pins are provided with one end of the return spring close to the sliding rod, the two positioning pins are at an equal distance from the central axis of the sliding rod, and the distance from the center of the guide seat is equal; a dial seat is fixedly connected to the top of the guide seat, the micrometer is installed on the dial seat, and the measuring rod of the micrometer passes through the dial seat downward to correspond to the wedge sleeve.

[0006] Preferably, at least one of the two through holes of the guide seat is provided with a keyway, and the sliding rod is circumferentially positioned by slidingly cooperating with the keyway through radially arranged guide pins.

[0007] Preferably, the guide pin is fixed to the sliding rod by interference fit.

[0008] Preferably, the sliding rod is a stepped shaft, one end of which is a large diameter section, the other end of which is a threaded small diameter section, and the middle is a medium diameter section. The large diameter section is a mounting seat for the first measuring head, and the mounting seat is provided with a radial hole. The first measuring head is installed in the radial hole and extends downwardly out of the mounting seat. The spring seat is provided with a stepped through hole. The spring seat is sleeved on the threaded small diameter section of the sliding rod through the small diameter hole of the stepped through hole and is locked with a nut. The large diameter hole of the spring seat faces the guide seat, and the return spring is sleeved on the sliding rod and located in the large diameter hole of the spring seat.

[0009] Preferably, the diameter of the mounting seat of the first measuring head is larger than the diameter of the through hole, and a limiting protrusion is provided on the outer wall of the guide seat. The limiting protrusion is located below or above the through hole on one side of the mounting seat and is used to limit the sliding rod.

[0010] Preferably, the axial length of the return spring in a compressed state is greater than the axial length of the large-diameter hole of the spring seat; and the first measuring head is fixed in the radial hole by a locking screw.

[0011] Preferably, an annular groove is provided in the middle section of the sliding rod, the wedge sleeve is provided with a radial threaded hole, the wedge sleeve is sleeved on the sliding rod, a limit screw is assembled in the radial threaded hole and inserted into the annular groove to position the wedge sleeve shaft on the sliding rod.

[0012] Preferably, a stepped hole running through the base from top to bottom is provided, an elastic locking sleeve is fitted in the stepped hole, the sleeve of the micrometer is inserted into the elastic locking sleeve, so that the measuring rod of the micrometer extends out of the lower end of the base, and the elastic locking sleeve is tightened by a tightening screw to fix the micrometer on the base.

[0013] Preferably, the elastic locking sleeve is provided with an opening penetrating the sleeve wall in the axial direction, so that the sleeve of the dial gauge can be clamped.

[0014] Preferably, the two radially extending arms of the guide seat are each provided with a positioning hole, the two positioning pins are respectively installed in a positioning hole and extend downward out of the radially extending arm, the two positioning pins are respectively fixed in the positioning hole by screws, and the lower ends of the two positioning pins are consistent in height with the lower end of the first measuring head.

[0015] The beneficial effects of the present invention are as follows: The guide seat is a hollow cylinder, the lower end of the guide seat is provided with a small diameter section for inserting into the axial hole of the measured piece, and two through holes penetrating the side wall are provided on a diameter in the middle of the guide seat, and a sliding rod passes through the two through holes and slidably cooperates with the guide seat. A wedge sleeve is fixedly provided on the middle section of the sliding rod, and the wedge sleeve is located in the inner cavity of the guide seat, and the front and rear ends of the sliding rod extend out of the guide seat respectively, wherein a first measuring head vertically downward is provided at the front end, and a return spring is sleeved at the rear end, and the return spring is in the spring seat, and the spring seat is fixedly connected to the sliding rod, and radial extension arms are symmetrically provided on the left and right sides of the lower part of the guide seat, and each of the two radial extension arms is equipped with a vertically downward positioning pin, and the two positioning pins are provided with one end of the return spring near the sliding rod, and the two positioning pins are at an equal distance from the central axis of the sliding rod and the distance from the center of the guide seat is equal; a dial seat is fixedly connected to the top of the guide seat, and the micrometer is installed on the dial seat, and the measuring rod of the micrometer passes through the dial seat downward and corresponds to the wedge sleeve.

[0016] The lower end of the guide seat is provided with a small diameter section for inserting into the axial hole of the measured part for preliminary positioning, which can improve the efficiency of measuring the boss diameter in the part groove; by setting the return spring, while ensuring the stability of the detection process, when the inspection fixture is not inspected, the sliding rod can automatically return to its position for the next rapid inspection of the part; two positioning pins are set with equal distances from the central axis of the sliding rod and the center of the guide seat, so that when measuring the boss diameter in the part groove, three-point positioning is formed by the two positioning pins and the first measuring head to ensure the measurement accuracy; the inspection fixture is provided with a micrometer, which can avoid errors in readings caused by inconsistent manual measurement techniques and improve the detection efficiency; the inspection fixture has low environmental requirements and can be configured next to the processing equipment; when a part is proofread The diameter measurement values ​​of the left and right sides of the boss in the groove are the maximum and minimum values ​​when they are qualified, respectively. It is only necessary to mark the diameters of the boss on the left and right sides of the proofreading part with the inspection fixture, and then measure the diameter of the boss in the groove of the part to be tested. It is possible to quickly confirm whether the diameter of the boss in the groove of the part is qualified by checking whether the pointer of the micrometer is in the marked area. The inspection fixture is easy to calibrate and has a fast detection speed. It can meet the requirements of all parts detection and does not require manual measurement with a caliper. The inspection fixture has a simple structure and a concise and clear internal structure. It does not contain complex parts and cumbersome connection methods. The various components are closely matched and reasonably laid out without redundant design. This simple structural design greatly improves the stability and reliability of the inspection fixture, and is also easy to manufacture, assemble and maintain.

[0017] Preferably, at least one of the two through holes of the guide seat is provided with a keyway, and the sliding rod is circumferentially positioned by sliding fit between a radially arranged guide pin and the keyway, and the guide pin is fixed to the sliding rod by interference fit.

[0018] Through this assembly method, the sliding rod can be positioned circumferentially, making the sliding rod more stable when moving, ensuring that the ball head of the first measuring head is vertically downward, and ensuring the measurement accuracy of the gauge.

[0019] Preferably, the sliding rod is a stepped shaft, one end of which is a large diameter section, the other end of which is a threaded small diameter section, and the middle is a medium diameter section, the large diameter section being a mounting seat for the first measuring head, the mounting seat being provided with a radial hole, the first measuring head being installed in the radial hole and extending downwardly outwardly from the mounting seat, the first measuring head being fixed in the radial hole by a locking screw, the diameter of the mounting seat for the first measuring head being larger than the diameter of the through hole, a limiting protrusion being provided on the outer wall of the guide seat, the limiting protrusion being located below or above the through hole on one side of the mounting seat, and being used to limit the sliding rod, the spring seat being provided with a stepped through hole, the spring seat being sleeved on the threaded small diameter section of the sliding rod through the small diameter hole of the stepped through hole and being locked with a nut, the large diameter hole of the spring seat facing the guide seat, the return spring being sleeved on the sliding rod and located in the large diameter hole of the spring seat, the axial length of the return spring in the compressed state being larger than the axial length of the large diameter hole of the spring seat.

[0020] The guide seat is provided with a limiting protrusion, which can produce a gap between the outer wall of the guide seat and the mounting seat on the sliding rod, reducing the contact area between the mounting seat on the sliding rod and the outer wall of the guide seat, and can effectively reduce the factors such as oil pollution that cause the mounting seat on the sliding rod to stick to the outer wall of the guide seat, thereby causing damage to the first measuring head. This structure can improve the sensitivity of the first measuring head and reduce the requirements of the inspection fixture on the environment; the axial length of the return spring in the compressed state is greater than the axial length of the large diameter hole of the spring seat, so that the sliding rod of the inspection fixture can automatically return to its position when not inspected, while improving the stability of the inspection process, so as to be used for the next rapid inspection of parts.

[0021] Preferably, an annular groove is provided in the middle section of the sliding rod, the wedge sleeve is provided with a radial threaded hole, the wedge sleeve is sleeved on the sliding rod, a limit screw is assembled in the radial threaded hole and inserted into the annular groove to position the wedge sleeve shaft on the sliding rod.

[0022] This assembly method can better fix the wedge sleeve and meet the requirements of lateral and circumferential fixation of the wedge sleeve. The annular groove on the sliding rod provides a precise positioning position for the installation of the wedge sleeve, and can also make the wedge sleeve more stably fixed on the sliding rod.

[0023] Preferably, a stepped hole penetrating from top to bottom is provided on the base, an elastic locking sleeve is fitted in the stepped hole, the sleeve of the dial gauge is inserted into the elastic locking sleeve, so that the measuring rod of the dial gauge extends out of the lower end of the base, and the elastic locking sleeve is tightened by a tightening screw to fix the dial gauge on the base, and an opening penetrating the sleeve wall along the axial direction is provided on the elastic locking sleeve to enable the sleeve of the dial gauge to be clamped.

[0024] An elastic locking sleeve is used with an opening that penetrates the sleeve wall along the axial direction. The opening design can adapt to sleeves of various sizes of micrometers, and can also make the sleeve of the micrometer easily inserted into the elastic locking sleeve from the axial direction and adjust the height of the micrometer; after the elastic locking sleeve is tightened with a screw, the micrometer can be effectively prevented from axial displacement. When the probe is subjected to torque, this fixing method can effectively resist the torsion and ensure the accuracy and stability of the measurement.

[0025] Preferably, the two radially extending arms of the guide seat are each provided with a positioning hole, the two positioning pins are respectively installed in a positioning hole and extend downward and outward from the radially extending arms, and the two positioning pins are respectively fixed in the positioning hole by screws.

[0026] This assembly method can fix the locating pin in a suitable position. The locating pin is fixed with a screw. The locating pin can be easily moved or replaced by loosening the screw, and then tightening the screw to complete the new installation and fixation. The operation is simple and quick. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a schematic diagram of the structure of the present invention during measurement; Figure 3 It is a structural schematic diagram of the table base in the present invention; Figure 4 It is a structural schematic diagram of the guide seat in the present invention; Figure 5 for Figure 4 A top view of Figure 6 for Figure 4 Left view of; Figure 7 It is a structural schematic diagram of the sliding rod in the present invention; Figure 8 It is a schematic diagram of the structure of the locking sleeve in the present invention; Fig. 9 It is a schematic diagram of the structure of the sliding sleeve in the present invention; Fig.10 It is a structural schematic diagram of the spring seat in the present invention.

[0028] Markings in the accompanying drawings: Micrometer 1, dial base 2, clamping screw 3, guide base 4, small diameter section 41, through hole 42, positioning hole 43, radially extending arm 44, positioning pin 45, sliding rod 5, mounting base 51, radial hole 52, locking screw 53, center axis 54, first measuring head 6, elastic locking sleeve 7, annular groove 8, wedge sleeve 9, limit screw 10, return spring 11, spring seat 12, nut 13, guide pin 14, measuring rod 15, gear 16, outer edge 161. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with the accompanying drawings: There is a gear, and the diameter of the boss in the groove of the part needs to be quickly detected. Figure 2 As shown, there is an annular groove at one axial end of the gear 16, the gear 16 has an axial hole, and there is an annular inner boss between the annular groove and the axial hole inside the gear 16. The annular inner boss is inside the gear 16. When the diameter of the annular inner boss is 61.97~62.00mm, it is considered qualified.

[0030] In order to quickly detect the diameter of the boss in the groove of the gear 16, a gauge for measuring the diameter of the boss in the groove of the part is designed. The specific structure of the gauge is as follows: See also Figures 1 to 10A gauge for measuring the diameter of a boss in a groove of a part, comprising a guide seat 4 and a micrometer 1. The guide seat 4 is a hollow cylinder. The lower end of the guide seat 4 is provided with a small diameter section 41 for inserting into the axial hole of the measured part. Two through holes 42 penetrating the side wall are arranged on a diameter in the middle of the guide seat 4. A sliding rod 5 passes through the two through holes 42 and slides with the guide seat 4. At least one of the two through holes 42 of the guide seat 4 is provided with a keyway. The sliding rod 5 is circumferentially positioned by slidingly cooperating with the keyway through a radially arranged guide pin 14. The guide pin 14 is fixed on the sliding rod 5 by an interference fit. A wedge sleeve 9 is fixedly arranged in the middle section of the sliding rod 5. The wedge sleeve 9 is located in the inner cavity of the guide seat 4. An annular groove 8 is provided in the middle section of the sliding rod 5, and the wedge sleeve 9 is provided with a radial threaded hole. The wedge sleeve 9 is sleeved on the sliding rod 5, and a limit screw 10 is assembled in the radial threaded hole and inserted into the annular groove 8 to position the wedge sleeve 9 axis on the sliding rod 5. The front and rear ends of the sliding rod 5 extend outward from the guide seat 4 respectively, wherein a first measuring head 6 is provided vertically downward at the front end, and a return spring 11 is sleeved at the rear end. The sliding rod 5 is a stepped shaft, one end of which is a large diameter section, the other end is a threaded small diameter section, and the middle is a medium diameter section. The large diameter section is a mounting seat 51 for the first measuring head 6, and the mounting seat 51 is provided with a radial hole 52. The first measuring head 6 is installed in the radial hole 52 and extends downward outward from the mounting seat 51. The first measuring head 6 is fixed in the radial hole 52 by a locking screw 53. The diameter of the mounting seat 51 of the first measuring head 6 is larger than the diameter of the through hole 42. A limiting protrusion is arranged on the outer wall of the guide seat 4. The limiting protrusion is located below or above the through hole 42 on one side of the mounting seat 51, and is used to limit the sliding rod 5. The spring seat 12 is provided with a stepped through hole. The spring seat 12 is sleeved on the threaded small diameter section of the sliding rod 5 through the small diameter hole of the stepped through hole and locked with a nut 13. The large diameter hole of the spring seat 12 faces the guide seat 4. The return spring 11 is sleeved on the sliding rod 5 and is located in the large diameter hole of the spring seat 12. The axial length of the return spring 11 in the compressed state is greater than the large diameter hole of the spring seat 12. The axial length of the hole, the return spring 11 is in the spring seat 12, the spring seat 12 is fixedly connected to the sliding rod 5, the radially extending arms 44 are symmetrically arranged on the left and right sides of the lower part of the guide seat 4, and the two radially extending arms 44 are each installed with a vertically downward positioning pin 45, and the two radially extending arms 44 of the guide seat 4 are each provided with a positioning hole 43, and the two positioning pins 45 are respectively installed in a positioning hole 43 and extend the radially extending arms 44 downward and outward, and the two positioning pins 45 are respectively fixed in the positioning hole 43 by screws, and the two positioning pins 45 are provided with one end of the return spring 11 near the sliding rod 5, and the two positioning pins 45 are at an equal distance from the central axis 54 of the sliding rod 5, and the distance from the center of the guide seat 4 is equal;A table seat 2 is fixedly connected to the top of the guide seat 4, and the micrometer 1 is installed on the table seat 2. The table seat 2 is provided with a stepped hole that runs through the top and bottom, and an elastic locking sleeve 7 is assembled in the stepped hole. The sleeve of the micrometer 1 is inserted into the elastic locking sleeve 7, so that the measuring rod 15 of the micrometer 1 extends out of the lower end of the table seat 2. The elastic locking sleeve 7 is compressed by a clamping screw 3 to fix the micrometer 1 on the table seat 2. The elastic locking sleeve 7 is provided with an opening that runs through the sleeve wall in the axial direction, so that the sleeve of the micrometer 1 is clamped in the elastic locking sleeve 7 by the clamping screw 3. The measuring rod 15 of the micrometer 1 passes through the table seat 2 downward and corresponds to the wedge sleeve 9. When the inspection tool is not inspected, the wedge sleeve 9 just contacts the measuring rod 15. ;

[0031] Adjust the reading of the micrometer 1 to 0, and use the proofreading piece of the gear 16 to debug the gauge for measuring the diameter of the boss in the groove of the part. The diameter of the boss in the groove of the proofreading piece is 61.97mm, and the thickness of the boss on the left side of the proofreading piece is 0.03mm thicker than that on the right side. When the proofreading piece of the gear 16 is measured on the left side with the gauge, the measured value corresponds to the maximum value of 62.00mm when qualified, and when the right side is measured with the gauge, the measured value corresponds to the minimum value of 61.97mm when qualified; Use the gauge to measure the diameter of the boss in the groove of the proofreading piece, first measure the left side of the proofreading piece, and insert the small diameter section 41 of the gauge guide seat 4 into the shaft hole of the proofreading piece, When the two locating pins 45 and the first measuring head 6 contact the outer edge 161 of the inner boss of the proofreading part, the small diameter section 41 of the guide seat 4 of the gauge continues to be inserted into the axial hole of the proofreading part, and the ball heads of the two locating pins 45 and the ball heads of the first measuring head 6 always maintain a close contact state with the inner boss of the proofreading part. The first measuring head 6 drives the sliding rod 5 to move to the left, and the wedge sleeve 9 fixed on the sliding rod 5 generates a reading by applying pressure to the measuring rod 15 of the micrometer 1. After the small diameter section 41 of the guide seat 4 is completely inserted into the axial hole of the proofreading part, the ball heads of the two locating pins 45 and the ball heads of the first measuring head 6 are located in the groove of the proofreading part and are in close contact with the inner boss of the proofreading part. , the ball head of the first measuring head 6 is located on the left side of the axial hole of the proofreading part, and the pointer position of the micrometer 1 is marked at this time. The reading of the micrometer 1 at this time corresponds to the outer diameter of the inner boss of the proofreading part is 62.00mm; lift the inspection fixture, and the rebound force of the return spring 11 resets the sliding rod, flips the inspection fixture, and measures the right side of the proofreading part again, inserts the small diameter section 41 of the inspection fixture guide seat 4 into the axial hole of the proofreading part, and when the two positioning pins 45 and the first measuring head 6 contact the outer edge 161 of the inner boss of the proofreading part, the small diameter section 41 of the guide seat 4 of the inspection fixture continues to be inserted into the axial hole of the proofreading part, and the ball heads of the two positioning pins 45 and the ball head of the first measuring head 6 always maintain contact with the proofreading part The first measuring head 6 drives the sliding rod 5 to move to the right in close contact with the inner boss. The wedge-shaped sleeve 9 fixed on the sliding rod 5 generates a reading by applying pressure to the measuring rod 15 of the micrometer 1. After the small-diameter section 41 of the guide seat 4 is fully inserted into the axial hole of the proofreading piece, the ball heads of the two locating pins 45 and the ball heads of the first measuring head 6 are located in the grooves of the proofreading piece and in close contact with the inner boss of the proofreading piece. The ball head of the first measuring head 6 is located on the right side of the axial hole of the proofreading piece. Mark the pointer position of the micrometer 1 at this time. The reading of the micrometer 1 corresponds to the outer diameter of the inner boss of the proofreading piece, which is 61.97 mm. The inspection fixture is lifted. At this time, the resilience of the return spring 11 resets the sliding rod.

[0032] This gauge for measuring the boss diameter in a part groove is relatively simple and convenient during debugging operations, and marking the micrometer 1 can significantly improve the efficiency of measurement.

[0033] After the micrometer 1 is marked, the above method is used to quickly measure the diameter of the boss in the groove of the gear 16. When the small diameter section 41 of the guide seat 4 of the gauge is completely inserted into the shaft hole of the gear 16, the pointer of the micrometer 1 is located between the two marked points, and the diameter of the boss in the groove of the gear 16 is between 61.97 and 62.00 mm, which is considered qualified; when the small diameter section 41 of the guide seat 4 of the gauge is completely inserted into the shaft hole of the gear 16, the pointer of the micrometer 1 is not between the two marked points, and the diameter of the boss in the groove of the gear 16 is not between 61.97 and 62.00 mm, which is considered unqualified.

[0034] This gauge for measuring the diameter of the boss in the groove of a part can quickly detect the diameter of the boss in the groove of the part, and can meet the full detection of the part. The gauge has low environmental requirements and can be configured next to the processing equipment, which can effectively meet the rapid detection needs of the boss processing process in the part.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification made to the present invention by those skilled in the art without departing from the spirit of the present invention shall fall within the protection scope of the present invention.

Claims

1. A gauge for measuring the diameter of a boss in a groove of a part, characterized in that: The invention comprises a guide seat (4) and a micrometer (1), wherein the guide seat (4) is a hollow cylinder, the lower end of the guide seat (4) is provided with a small diameter section (41) for inserting into the axial hole of the measured object, two through holes (42) penetrating the side wall are provided on a diameter in the middle of the guide seat (4), a sliding rod (5) passes through the two through holes (42) and is slidably matched with the guide seat (4), a wedge sleeve (9) is fixedly provided on the middle section of the sliding rod (5), the wedge sleeve (9) is located in the inner cavity of the guide seat (4), the front and rear ends of the sliding rod (5) respectively extend out of the guide seat (4), wherein a first measuring head (6) is provided vertically downward at the front end, and a return spring (11) is provided at the rear end, and the return spring (11) is provided at the The spring seat (12) is fixedly connected to the sliding rod (5), and radially extending arms (44) are symmetrically arranged on the left and right sides of the lower part of the guide seat (4). The two radially extending arms (44) are each equipped with a vertically downward positioning pin (45). The two positioning pins (45) are provided with one end of a return spring (11) near the sliding rod (5). The two positioning pins (45) are equidistant from the central axis (54) of the sliding rod (5) and the center of the guide seat (4). A dial seat (2) is fixedly connected to the top of the guide seat (4), and the micrometer (1) is installed on the dial seat (2). The measuring rod (15) of the micrometer (1) passes through the dial seat (2) and downwardly corresponds to the wedge sleeve (9).

2. The gauge for measuring the diameter of the boss in the groove of a part according to claim 1, characterized in that: At least one of the two through holes (42) of the guide seat (4) is provided with a keyway, and the sliding rod (5) is circumferentially positioned by slidingly cooperating with the keyway through a radially arranged guide pin (14).

3. The gauge for measuring the diameter of the boss in the groove of a part according to claim 2, characterized in that: The guide pin (14) is fixed on the sliding rod (5) by interference fit.

4. The gauge for measuring the diameter of the boss in the groove of a part according to claim 1, characterized in that: The sliding rod (5) is a stepped shaft, one end of which is a large diameter section, the other end of which is a threaded small diameter section, and the middle of which is a medium diameter section. The large diameter section is a mounting seat (51) of a first measuring head (6). The mounting seat (51) is provided with a radial hole (52). The first measuring head (6) is mounted in the radial hole (52) and extends downwardly out of the mounting seat (51). The spring seat (12) is provided with a stepped through hole. The spring seat (12) is sleeved on the threaded small diameter section of the sliding rod (5) through the small diameter hole of the stepped through hole and is locked with a nut (13). The large diameter hole of the spring seat (12) faces the guide seat (4). The return spring (11) is sleeved on the sliding rod (5) and is located in the large diameter hole of the spring seat (12).

5. The gauge for measuring the diameter of the boss in the groove of a part according to claim 4, characterized in that: The diameter of the mounting seat (51) of the first measuring head (6) is larger than the diameter of the through hole (42), and a limiting protrusion is provided on the outer wall of the guide seat (4). The limiting protrusion is located below or above the through hole (42) on one side of the mounting seat (51) and is used to limit the sliding rod (5).

6. The gauge for measuring the diameter of the boss in the groove of a part according to claim 4, characterized in that: The axial length of the return spring (11) in a compressed state is greater than the axial length of the large-diameter hole of the spring seat (12); and the first measuring head (6) is fixed in the radial hole (52) by a locking screw (53).

7. The gauge for measuring the diameter of the boss in the groove of a part according to claim 1, characterized in that: An annular groove (8) is provided in the middle section of the sliding rod (5), and the wedge sleeve (9) is provided with a radial threaded hole. The wedge sleeve (9) is sleeved on the sliding rod (5), and a limit screw (10) is assembled in the radial threaded hole and inserted into the annular groove (8) to position the wedge sleeve (9) axis on the sliding rod (5).

8. The gauge for measuring the diameter of the boss in the groove of a part according to claim 1, characterized in that: The base (2) is provided with a stepped hole extending vertically therethrough, an elastic locking sleeve (7) is assembled in the stepped hole, the sleeve of the micrometer (1) is inserted into the elastic locking sleeve (7), so that the measuring rod (15) of the micrometer (1) extends out of the lower end of the base (2), and the elastic locking sleeve (7) is compressed by a compression screw (3) to fix the micrometer (1) on the base (2).

9. The gauge for measuring the diameter of the boss in the groove of a part according to claim 8, characterized in that: The elastic locking sleeve (7) is provided with an opening penetrating the sleeve wall in the axial direction, so that the sleeve of the micrometer (1) can be clamped.

10. The gauge for measuring the diameter of the boss in the groove of a part according to claim 1, characterized in that: The two radially extending arms (44) of the guide seat (4) are each provided with a positioning hole (43), the two positioning pins (45) are each installed in a positioning hole (43) and extend downwardly out of the radially extending arms (44), and the two positioning pins (45) are each fixed in the positioning hole (43) by means of screws.

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