A screw thread micrometer master gauge calibration device

Abstract

The present application belongs to the technical field of measuring tools or methods, and particularly relates to a calibration device for a thread micrometer calibration rod. The calibration device comprises a distance measuring device for obtaining the horizontal distance between two ends of the thread micrometer calibration rod; a support device comprising a front support device and a rear support device with lifting functions, respectively used for supporting the two ends of the thread micrometer calibration rod; a leveling device arranged between the front support device and the rear support device and maintaining the same horizontal state with the thread micrometer calibration rod; and a positioning device used for fixing the height position of the support device. Through the lifting adjustment of the front support device and the rear support device, the thread micrometer calibration rod is aligned with the distance measuring device, and the technical effect of leveling the thread micrometer calibration rod is realized by reading the reading of the leveling device. In addition, the position of the leveled support device is fixed by the positioning device to realize the effect of stabilizing the leveling state of the calibration device.

Description

Technical Field

[0001] This invention belongs to the technical field of measuring instruments or methods, and particularly relates to a calibration device for a thread micrometer calibration rod. Background Technology

[0002] A thread micrometer is a commonly used micro-measuring tool in mechanical manufacturing, also known as a plug micrometer. It is a mechanical measuring tool that uses a precision screw pair for measurement and reads the scale from the micrometer drum and the fixed sleeve. A thread micrometer calibration rod is a standard part used to check the accuracy of the thread micrometer. Thread micrometer calibration rods generally have a certain degree of error when they leave the factory, so they need to be calibrated before use.

[0003] The calibration method for the thread micrometer calibration rod is based on the National Metrological Verification Regulation JJG24-2005 "Thread Micrometer," which stipulates that the calibration is performed on a vertical optical gauge using a comparative method with three needles and four equal gauge blocks of 3.177 mm in diameter and a groove gauge. During calibration, the axis of the thread micrometer calibration rod must be kept parallel to the ground when it is held horizontally. However, in practice, the calibration rod is often fixed manually before calibration, which easily introduces errors. Alternatively, a support platform set up with a distance measuring device is used to support the thread micrometer calibration rod, but unevenness of the table or support platform can also cause errors, making the calibration process inaccurate. Summary of the Invention

[0004] The purpose of this invention is to provide a calibration device for a thread micrometer calibration rod. This invention achieves the technical effect of aligning the thread micrometer calibration rod with the measuring device by adjusting the lifting of the front support and the rear support, and by reading the leveling part to achieve the leveling of the thread micrometer calibration rod.

[0005] Furthermore, considering the high precision requirements of the thread micrometer calibration rod, its weight during frequent installations can cause the platform to tilt slightly. Therefore, the platform must be leveled again after each calibration, which is very cumbersome. A second objective of this invention is to use a positioning component to fix the leveled support component, thereby achieving a stable leveling state for the calibration device.

[0006] The technical solution adopted by the present invention to solve the above problems is: a calibration device for a thread micrometer calibration rod, including a distance measuring device for obtaining the horizontal distance between the two ends of the thread micrometer calibration rod;

[0007] The support components include a front support component and a rear support component with lifting function, which are respectively used to support the two ends of the thread micrometer calibration rod;

[0008] A leveling component is positioned between the front support and the rear support, and maintains the same horizontal position as the threaded micrometer calibration rod.

[0009] Positioning element, used to fix the height position of the support device.

[0010] A further preferred technical solution is that the support member is composed of a support unit; the support unit includes an upper rod, a lower rod, a height adjustment member disposed between the upper rod and the lower rod, and a rod support disposed at the upper end of the upper rod for supporting the thread micrometer calibration rod.

[0011] A further preferred technical solution is that the measuring component is composed of a linkage unit; the linkage unit includes a main rod, a secondary rod, a telescopic component for connecting the main rod and the secondary rod, and a hinge component respectively disposed on the outer ends of the main rod and the secondary rod for connecting the upper rod or the lower rod.

[0012] A further preferred technical solution is that the distance from the rotation axis of the hinge in the front support to the rod support surface is equal to the distance from the rotation axis of the hinge in the rear support to the rod support surface, and the measuring flat element is disposed on the main rod and / or the auxiliary rod.

[0013] A further preferred technical solution is that: a retraction groove is provided on the inner end of the auxiliary rod; the telescopic component includes a sliding rod disposed on the inner end of the main rod, with the other end installed in the retraction groove.

[0014] A further preferred technical solution is that: a limiting groove is provided on the inner side of the return groove; the telescopic member also includes a limiting block disposed on the sliding rod and installed in the limiting groove; the groove extension direction of the limiting groove is consistent with the movement direction of the sliding rod.

[0015] A further preferred technical solution is that: the auxiliary rod is also provided with a positioning through hole and a positioning screw hole for connecting the positioning through hole and the return groove; the telescopic member also includes a threaded groove provided on the inner end of the sliding rod; the positioning member includes a positioning bolt screwed into the positioning screw hole and used to simultaneously screw into the threaded groove, and a knob provided on the positioning bolt.

[0016] A further preferred technical solution is that: the lower rod is provided with a height adjustment groove for installing the height adjustment component, and an internally threaded hole body provided on the height adjustment groove; the height adjustment component includes a threaded post installed in the height adjustment groove and screwed to the internally threaded hole body, a rotating rod for driving the threaded post to rotate, and a turntable for driving the rotating rod to rotate.

[0017] A further preferred technical solution is that: the lower rod is also provided with a rotating hole communicating with the height adjustment groove; the rotating rod includes a rotating column rotatably mounted on the inner bottom surface of the height adjustment groove, and a gear disposed on the rotating column; the turntable includes a drive disk, a drive rod disposed on the drive disk and mounted in the rotating hole, and a crown gear disposed on the inner end of the drive rod and used to mesh with the gear.

[0018] A further preferred technical solution is that: the lower end of the threaded column (203a) is provided with a rotating groove (203a1) for mounting the rotating column (203b1), and a force transmission groove (203a2) provided on the rotating groove (203a1); the rotating rod (203b) further includes a force transmission block (203b3) provided on the rotating column (203b1) and used for mounting in the force transmission groove (203a2).

[0019] In summary, the present invention has the following advantages:

[0020] First, the support component with lifting and leveling functions can ensure that the thread micrometer calibration rod can always be adjusted to the appropriate position for calibration during the calibration process, thereby improving calibration accuracy.

[0021] Secondly, the connecting rod unit between the front and rear support members always remains parallel to the thread micrometer calibration rod, so that the level measuring component installed on it can reflect the horizontal state of the thread micrometer calibration rod in real time.

[0022] Third, the positioning component acts directly on the telescopic component of the linkage unit. When the telescopic component is locked, the linkage unit also loses its telescopic function, so there will be no vertical relative displacement between the front and rear support components, thus achieving a stable state of maintaining the horizontal angle.

[0023] Fourth, after the positioning component locks the telescopic component, it also locks the height position of the front and rear support components. That is, when the height adjustment component of one support component becomes loose, the other support component can maintain the height of the loose support component through the linkage unit.

[0024] Fifth, the positioning component eliminates the complex steps of locking the front and rear support components separately by locking the linkage unit in one simple step.

[0025] Sixth, the positioning component acts only on the linkage unit and not on the front and rear support components, thus avoiding the risk of accidentally touching the height adjustment component during the process of locking the front and rear support components separately, which could cause the leveling state to change.

[0026] Seventh, during the process of locking the telescopic component with the positioning component, the component always moves along the extension direction of the telescopic component, so that the main and auxiliary rods will not be bent due to the force perpendicular to the positioning component. In other words, the locking process does not affect the already leveled main and auxiliary rods. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the calibration device for a thread micrometer calibration rod.

[0028] Figure 2 for Figure 1 An enlarged schematic diagram of the support unit section.

[0029] Figure 3 This is a structural schematic diagram of the support unit.

[0030] Figure 4 This is a schematic diagram of the linkage unit.

[0031] Figure 5 This is a schematic diagram of the connection between the auxiliary rod and the telescopic component, with the auxiliary rod in axial section to show the structure of the sliding rod installed in the groove and the positioning component installed in the positioning component through hole.

[0032] Figure 6 for Figure 5 A schematic diagram showing the positioning bolt being screwed into the threaded groove to lock the sliding rod.

[0033] Figure 7 This is a schematic diagram of the connection between the upper and lower rods, with the lower rod shown in an axial cross-section to illustrate the component structure installed in the height adjustment slot.

[0034] Figure 8 for Figure 7 Enlarged schematic diagram of the connection between the threaded column and the rotating rod.

[0035] Figure 9 for Figure 8 An enlarged schematic diagram of the connection between the threaded column and the rotating column, with the threaded column in axial section to show the component structure installed in the rotating slot.

[0036] In the attached diagram, the components represented by each number are as follows: Threaded micrometer calibration rod A, distance measuring device 1, support unit 2, connecting rod unit 3, leveling component 4, positioning component 5, length measuring machine 101, pin gauge 102, laser rangefinder 103, upper rod 201, lower rod 202, height adjustment component 203, rod support 204, main rod 301, auxiliary rod 302, telescopic component 303, hinge component 304, positioning bolt 501, knob 502, height adjustment groove 202a, internal threaded hole 202b, rotating hole 202 c, Internal threaded hole body 202b, threaded column 203a, rotating rod 203b, turntable 203c, return groove 302a, limiting groove 302b, positioning part through hole 302c, positioning screw hole 302d, sliding rod 303a, limiting block 303b, threaded groove 303c, rotating groove 203a1, force transmission groove 203a2, rotating column 203b1, gear 203b2, force transmission block 203b3, drive disk 203c1, drive rod 203c2, crown gear 203c3. Detailed Implementation

[0037] Outer end: refers to the end of an object with a distinct longer side, such as a rod or bar, that faces outwards into space; for example, the outer end of the main rod 301 and the secondary rod 302 refers to the end closer to the support unit 2. Similarly, it is easy to see that the inner end refers to the opposite end of the outer end;

[0038] The present invention will be further described in detail below with reference to the accompanying drawings.

[0039] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

[0040] Example: Reference Figure 1 The ranging device 1 includes:

[0041] The length measuring machine 101 is a precision instrument for measuring large dimensions. It is used to accurately measure the length of some extra-long workpieces. For example, the model is JD90A.

[0042] Pin gauge 102 is a cylindrical measuring tool with a nominal diameter. In the measurement of the thread micrometer calibration rod, the pin gauge diameter is generally φ3.177mm. It is fixed to the length measuring machine 101 by a clamp for the calibration process of the thread micrometer calibration rod A. The clamp includes two sets, which respectively set the pin gauge at the front and rear ends of the thread micrometer calibration rod A, and the distance between them can be adjusted by the length measuring machine 101.

[0043] The laser rangefinder 103 is an instrument that uses laser to measure distance. The method of use is as follows: First, place a gauge block of standard length between the front and rear needle gauges. Then, adjust the reading of the laser rangefinder to 0. Next, remove the gauge block and install the micrometer calibration rod A between the front and rear needle gauges. The error of the micrometer calibration rod A is determined by reading the distance the front needle gauge moves closer to the laser rangefinder 103. For example, if the laser rangefinder measures a movement of 0.05mm towards the laser rangefinder 103, then the micrometer calibration rod A has an error of +0.05mm.

[0044] In addition, by adjusting the height of the two supports set below the thread micrometer calibration rod A, the thread micrometer calibration rod A can be adjusted to be between the front and rear needle gauges.

[0045] refer to Figure 2 The linkage unit 3 has a telescopic function, and the distance from the rotation axis of the hinge 304 in the front support to the support surface of the rod support 204 is equal to the distance from the rotation axis of the hinge 304 in the rear support to the support surface of the rod support 204. It can be seen that a parallelogram is formed by connecting the midpoints of the support surfaces of the rod supports 204 in the front and rear supports, and the midpoint of the rotation axis of the middle hinge 304. The linkage unit 3 and the thread micrometer calibration rod A form the parallel sides of this parallelogram. Thus, by simply installing the leveling piece 4 on the linkage unit 3, the current levelness of the thread micrometer calibration rod A can be read in real time. This saves the step of measuring the current levelness of the thread micrometer calibration rod A using contact or non-contact methods each time it is calibrated, thereby simplifying the operation.

[0046] In addition, the positioning element 5 can be used to fix the linkage unit 3, so that it loses its telescopic function. In this way, when either the front or rear support needs to actively or passively adjust its height, it will be prevented by the linkage unit 3 of fixed length, thus achieving the fixing function.

[0047] refer to Figure 3 The support is composed of a support unit 2; the support unit 2 includes an upper rod 201, a lower rod 202, an adjusting member 203 disposed between the upper rod 201 and the lower rod 202, and a rod support 204 disposed at the upper end of the upper rod 201 for supporting the thread micrometer calibration rod. In this embodiment, the upper end of the adjusting member 203 is fixed to the lower end of the upper rod 201, and the lower end of the adjusting member 203 is telescopically installed in the lower rod 202. By adjusting the length of the adjusting member 203 installed in the lower rod 202, the overall height of the adjusting member 203 and the lower rod 202 is changed, thereby raising or lowering the upper rod 201, and thus changing the height of the rod support 204 used to support the thread micrometer calibration rod A.

[0048] In another embodiment, the lower end of the height adjustment component 203 is fixed to the upper end of the lower rod 202, and the upper end of the height adjustment component 203 is telescopically installed in the upper rod 201. By adjusting the length of the height adjustment component 203 installed in the upper rod 201, the overall height of the height adjustment component 203 and the upper rod 201 is changed, thereby raising or lowering the upper rod 201. This embodiment only discusses the specific structure of the upper end of the height adjustment component 203 being fixed to the lower end of the upper rod 201.

[0049] refer to Figure 4 The leveling component is composed of a linkage unit 3; the linkage unit 3 includes a main rod 301, a secondary rod 302, a telescopic member 303 for connecting the main rod 301 and the secondary rod 302, and a hinge member 304 respectively disposed on the outer ends of the main rod 301 and the secondary rod 302 for connecting the upper rod 201. The hinge member allows the main rod 301 and the secondary rod 302 to be rotatably connected to the upper rod 201, and the outer ends of the main rod 301 and the secondary rod 302 can move together with the change in height of the upper rod 201.

[0050] One end of the telescopic component 303 is set on the inner end of the main rod 301, and the other end is telescopically installed in the secondary rod 302. When the distance between the two hinges 304 changes, the other end of the telescopic component 303 will also change its length installed in the secondary rod 302, thereby realizing the telescopic property of the linkage unit 3.

[0051] In this embodiment, the positioning element 5 is mounted on the auxiliary rod 302 and a portion of it is exposed outside the rod to facilitate direct operation of the positioning element 5.

[0052] In this embodiment, the main rod 301 is significantly longer than the short rod, and the measuring element 4 is mounted on the main rod 301. However, this does not mean that the measuring element 4 can only be mounted on the main rod 301; it can also be mounted on the secondary rod 302. The advantage of mounting it on the main rod 301 is that when operating the positioning element 5 located on the secondary rod 302, it is less likely to accidentally touch the measuring element 4.

[0053] refer to Figure 5 The inner end of the secondary rod 302 is provided with a return groove 302a; the telescopic member 303 includes a sliding rod 303a disposed at the inner end of the main rod 301, with the other end installed in the return groove 302a. The sliding rod 303a can slide along the return groove 302a in the secondary rod 302.

[0054] Furthermore, a limiting groove 302b is provided on the inner side of the return groove 302a; the telescopic member 303 also includes a limiting block 303b disposed on the sliding rod 303a and installed in the limiting groove 302b; the groove extension direction of the limiting groove 302b is consistent with the movement direction of the sliding rod 303a. When the limiting block 303b is installed in the limiting groove 302b, the sliding rod 303a cannot slide directly out of the return groove 302a by movement, because all the openings of the limiting groove 302b are located within the return groove 302a. In addition, the process of installing the limiting block 303b in the limiting groove 302b will not affect the process of the sliding rod 303a sliding along the return groove 302a in the auxiliary rod 302.

[0055] In addition, the auxiliary rod 302 is also provided with a positioning through hole 302c and a positioning screw hole 302d for connecting the positioning through hole 302c and the return groove 302a; the telescopic member 303 also includes a threaded groove 303c provided on the inner end of the sliding rod 303a; the positioning member 5 includes a positioning bolt 501 screwed into the positioning screw hole 302d and used to simultaneously screw into the threaded groove 303c, and a knob 502 provided on the positioning bolt 501. In the non-fixed state, the positioning bolt 501 is only screwed into the positioning screw hole 302d. When it is necessary to fix the position of the sliding rod 303a, the knob 502 is rotated to make the positioning bolt 501 screwed into the threaded groove 303c and finally screwed into the threaded groove 303c. By the positioning bolt 501 being simultaneously screwed into the positioning screw hole 302d and the threaded groove 303c, the sliding rod 303a can no longer slide along the return groove 302a. Figure 6 As shown, this achieves the locking function.

[0056] It is easy to see that when it is necessary to release the fixing effect on the sliding rod 303a, it is only necessary to rotate the knob 502 in the opposite direction to disengage the positioning bolt 501 from the threaded groove 303c.

[0057] refer to Figure 7 The lower rod 202 is provided with a height adjustment groove 202a for mounting the height adjustment component 203, and an internally threaded hole 202b disposed in the height adjustment groove 202a. The height adjustment component 203 includes a threaded post 203a installed in the height adjustment groove 202a and screwed to the internally threaded hole 202b, a rotating rod 203b for driving the threaded post 203a to rotate, and a turntable 203c for driving the rotating rod 203b to rotate. By controlling the rotation of the rotating rod 203b through the turntable 203c, the threaded post 203a is driven to rotate, thereby changing the height position screwed to the internally threaded hole 202b, ultimately achieving the effect of adjusting the height of the upper rod 201.

[0058] refer to Figure 8The lower rod 202 is also provided with a rotating hole 202c communicating with the height adjustment groove 202a; the rotating rod 203b includes a rotating column 203b1 rotatably mounted on the inner bottom surface of the height adjustment groove 202a, and a gear 203b2 disposed on the rotating column 203b1; the turntable 203c includes a drive disc 203c1, a drive rod 203c2 disposed on the drive disc 203c1 and mounted in the rotating hole 202c, and a crown gear 203c3 disposed on the inner end of the drive rod 203c2 and used to mesh with the gear 203b2. When the drive disc 203c1 is rotated, the crown gear 203c3 is driven to rotate through the drive rod 203c2, thereby driving the gear 203b2 to rotate. The gear 203b2 is coaxially fixed together with the rotating column 203b1, so that the gear can drive the rotating column to rotate together, thereby driving the threaded column 203a to rotate.

[0059] It is easy to see that when the height of the threaded post 203a needs to be adjusted in the opposite direction, it is only necessary to rotate the drive disk 203c1 in the opposite direction.

[0060] It should be noted that the rotating column 203b1 and the threaded column 203a are connected in a manner that prevents relative rotation but allows axial relative movement. That is, the rotating column 203b1 can drive the threaded column 203a to rotate, but it does not restrict the height adjustment process of the threaded column 203a.

[0061] refer to Figure 9 The threaded post 203a has a rotating groove 203a1 at its lower end for mounting the rotating post 203b1, and a force transmission groove 203a2 disposed on the rotating groove 203a1; the rotating rod 203b also includes a force transmission block 203b3 disposed on the rotating post 203b1 and for mounting in the force transmission groove 203a2. When the rotating post 203b1 rotates, it drives the force transmission block 203b3 engaged in the force transmission groove 203a2 to rotate, thereby driving the threaded post 203a to rotate.

[0062] It should be noted that the interlocking action between the force transmission groove 203a2 and the force transmission block 203b3 will not affect the height movement of the threaded column 203a.

[0063] In summary, a calibration method for a thread micrometer calibration rod includes the following steps:

[0064] S11. Adjust the front and rear support components to the same height as the needle gauge 102 using the drive disc 203c1, and level the rod support 204 by reading the reading of the leveling piece 4;

[0065] S12. Rotate knob 502 to lock the current height and levelness of the front and rear supports;

[0066] S13. Place the gauge block of standard length on the rod support 204 and zero the laser rangefinder 103;

[0067] S14. Remove the gauge block and place the thread micrometer calibration rod A on the rod support 204. Adjust the position of the front needle gauge and record the value of the laser rangefinder to obtain the error value of the thread micrometer calibration rod.

[0068] Furthermore, the same or similar element symbols are used as far as possible in the accompanying drawings and description to refer to the same or similar parts or steps. The drawings are presented in a simplified form and are not drawn to scale. For convenience and clarity only, directional terms such as top, bottom, left, right, upward, above, above, below, behind, and front may be used to refer to the drawings. These and similar directional terms should not be construed as limiting the scope of this disclosure in any way.

Claims

1. A calibration device for a thread micrometer calibration rod, used in the calibration process of a thread micrometer calibration rod, characterized in that, include: The distance measuring device (1) is used to obtain the horizontal distance between the two ends of the thread micrometer calibration rod; The support components include a front support component and a rear support component with lifting function, which are respectively used to support the two ends of the thread micrometer calibration rod; The leveling component (4) is set between the front support and the rear support, and maintains the same horizontal state as the thread micrometer calibration rod; Positioning component (5) is used to fix the height position of the support component; the support component is composed of a support unit (2); the support unit (2) includes an upper rod (201), a lower rod (202), and a height adjustment component (203) disposed between the upper rod (201) and the lower rod (202), and a rod support (204) disposed at the upper end of the upper rod (201) and used to support the thread micrometer calibration rod; the leveling component is composed of a connecting rod unit (3); the connecting rod unit (3) includes a main rod (301) and a secondary rod (302). The telescopic member (303) is used to connect the main rod (301) and the auxiliary rod (302), and the hinge member (304) is respectively provided on the outer ends of the main rod (301) and the auxiliary rod (302) and used to connect the upper rod (201); the distance from the rotation axis of the hinge member (304) in the front support member to the support surface of the rod support (204) is equal to the distance from the rotation axis of the hinge member (304) in the rear support member to the support surface of the rod support (204), and the measuring flat member (4) is provided on the main rod (301) and / or the auxiliary rod (302). The auxiliary rod (302) has a return groove (302a) on its inner end; the telescopic member (303) includes a sliding rod (303a) disposed on the inner end of the main rod (301) and with its other end installed in the return groove (302a); a limiting groove (302b) is provided on the inner side of the return groove (302a); the telescopic member (303) also includes a limiting block (303b) disposed on the sliding rod (303a) and installed in the limiting groove (302b); the auxiliary rod (302) The upper part is also provided with a positioning through hole (302c) and a positioning screw hole (302d) for connecting the positioning through hole (302c) and the return groove (302a); the telescopic part (303) also includes a threaded groove (303c) provided on the inner end of the sliding rod (303a); the positioning part (5) includes a positioning bolt (501) screwed on the positioning screw hole (302d) and used to simultaneously screw on the threaded groove (303c), and a knob (502) provided on the positioning bolt (501).

2. The calibration device for a thread micrometer calibration rod according to claim 1, characterized in that, The lower rod (202) is provided with a height adjustment groove (202a) for installing the height adjustment component (203) and an internally threaded hole (202b) provided on the height adjustment groove (202a); the height adjustment component (203) includes a threaded post (203a) installed in the height adjustment groove (202a) and screwed to the internally threaded hole (202b), a rotating rod (203b) for driving the threaded post (203a) to rotate, and a turntable (203c) for driving the rotating rod (203b) to rotate.

3. The calibration device for a thread micrometer calibration rod according to claim 2, characterized in that, The lower rod (202) is also provided with a rotating hole (202c) communicating with the height adjustment groove (202a); the rotating rod (203b) includes a rotating column (203b1) rotatably mounted on the inner bottom surface of the height adjustment groove (202a), and a gear (203b2) disposed on the rotating column (203b1); the turntable (203c) includes a drive disk (203c1), a drive rod (203c2) disposed on the drive disk (203c1) and mounted in the rotating hole (202c), and a crown gear (203c3) disposed on the inner end of the drive rod (203c2) and used to mesh with the gear (203b2).

4. The calibration device for a thread micrometer calibration rod according to claim 3, characterized in that, The lower end of the threaded column (203a) is provided with a rotating groove (203a1) for mounting the rotating column (203b1) and a force transmission groove (203a2) provided on the rotating groove (203a1); the swivel rod (203b) also includes a force transmission block (203b3) provided on the rotating column (203b1) and used for mounting in the force transmission groove (203a2).

Images