Accurate position measurement auxiliary tool for hardness tester

Abstract

The invention discloses a precise position measurement assistive device for a durometer, and relates to the technical field of auxiliary devices for durometer measurement, the precise position measurement assistive device comprises a mounting base and a sample positioning cylinder, the bottom of the mounting base is provided with a mounting clamping groove, and the precise position measurement assistive device further comprises a measurement position positioning mechanism and a position adjusting mechanism, the measurement position positioning mechanism comprises a positioning steel needle and an adjustable lifting alignment mechanism, and the positioning steel needle is used for positioning a hardness measurement position on the test piece. The positioning steel needle slides along the guide rail through the sliding seat, the first telescopic square rod and the second telescopic square rod stretch out and draw back, the positioning steel needle can be conveniently and rapidly aligned with a measurement position marked on a test piece, and the positioning steel needle and the conical positioning guide sleeve are longitudinally and coaxially aligned, so that the conical positioning guide sleeve is synchronously aligned with the measurement position; and the detection pressure head can be conveniently and quickly inserted into the central position of the conical positioning guide sleeve by means of the guide of the inclined surface on the inner side of the conical positioning guide sleeve, so that the detection pressure head is accurately aligned with the measurement position.

Description

Technical Field

[0001] The invention relates to the technical field of auxiliary tools for hardness tester measurement, and in particular to an auxiliary tool for precise position measurement of a hardness tester. Background Art

[0002] A hardness tester is a hardness testing instrument, which is mainly used to measure the hardness value of materials. It is widely used in hardness testing of various materials, including steel, casting, heat treatment, automotive parts, bearings, rubber and plastics and other metal and non-metal industries. In the hardness measurement process, it is generally necessary to align the detection pressure head on the hardness tester with the corresponding position on the test piece for detection, so it is necessary to adjust the relative position between the test piece and the detection pressure head.

[0003] The existing hardness tester includes a detection pressure head and a liftable round stage. During testing, it is necessary to first place the test piece or standard test block on the liftable round stage, and then visually inspect and manually determine the relative position of the test piece with respect to the detection pressure head during measurement. Then, the liftable round stage drives the test block to rise and contact the detection pressure head for hardness testing.

[0004] The shortcomings of the existing hardness tester are: the existing hardness tester relies on naked eye observation to directly manually place and adjust the position of the test block, which makes it difficult to ensure that the measuring position on the test block is accurately aligned with the detection pressure head, which easily leads to inaccurate test results; although there is also a method of adding an auxiliary tool to the object stage of the hardness tester, placing the test block on the auxiliary tool, and relying on the auxiliary tool to adjust the position, but generally the auxiliary tool mainly relies on rotating threaded adjustment parts in different directions when adjusting the position, and the threaded adjustment parts are used to adjust the position in different directions. It is necessary to repeatedly rotate the threaded adjustment parts in different directions, especially when the distance between the measuring points is small, and repeated calibration and multiple measurements are required. The operation is not convenient enough and the operating efficiency is low. At the same time, the adjustment process still relies entirely on naked eye observation to see whether the measuring position of the test block and the relative position of the detection pressure head are aligned, and the accuracy is low, because before the formal detection, there is a certain distance between the test block and the detection pressure head, which is difficult to align. Summary of the invention

[0005] The object of the present invention is to provide a precise position measurement auxiliary tool for a hardness tester, so as to solve the technical problem in the prior art that it is inconvenient to adjust the precise measurement position during the hardness tester testing a sample.

[0006] The technical problem to be solved by the present invention can be achieved by the following technical solutions:

[0007] A precise position measurement auxiliary tool for a hardness tester comprises a mounting base and a sample positioning cylinder, wherein a mounting slot is provided at the bottom of the mounting base, and further comprises:

[0008] A measurement position positioning mechanism, the measurement position positioning mechanism comprises a positioning steel needle and an adjustable lifting alignment mechanism, the positioning steel needle is used to locate the hardness measurement position on the test piece; the adjustable lifting alignment mechanism moves laterally synchronously with the positioning steel needle, and the adjustable lifting alignment mechanism is used to dock with the detection pressure head of the hardness tester so that the detection pressure head is aligned with the positioning steel needle;

[0009] The position adjustment mechanism comprises an upper movable plate and an intermediate mounting plate. The upper movable plate is slidably arranged on the intermediate mounting plate. The sample positioning tube is slidably arranged on the upper movable plate. The moving directions of the sample positioning tube and the upper movable plate are perpendicular to each other.

[0010] As a further solution of the present invention: a guide groove is provided at the bottom of the upper movable plate, and a guide key which is slidably matched with the guide groove is fixedly connected to the middle mounting plate.

[0011] As a further solution of the present invention: the sample positioning cylinder and the upper movable plate are both equipped with sliding guide mechanisms, and the two groups of sliding guide mechanisms include a connecting guide sleeve and a guide tube. The connecting guide sleeve corresponding to the sample positioning cylinder is fixedly connected to one side of the upper movable plate, and the connecting guide sleeve corresponding to the upper movable plate is fixedly connected to one side of the intermediate mounting plate. The guide tubes of the two groups of sliding guide mechanisms are perpendicular to each other, and each guide tube slides through the corresponding connecting guide sleeve. The sample positioning cylinder and the upper movable plate move synchronously with the corresponding guide tubes respectively, and the connecting guide sleeve is threaded with a first fastening bolt for fixing the guide tube.

[0012] As a further solution of the present invention: each guide tube is threadedly connected with an adjusting screw, the sample positioning tube and the upper movable plate are both provided with rotating connecting pieces, and the sample positioning tube and the upper movable plate are respectively rotatably connected to the corresponding adjusting screws through corresponding rotating connecting pieces.

[0013] As a further solution of the present invention: the rotating connecting piece includes a cylindrical head, and a T-slot is provided on the side of the sample positioning cylinder close to the corresponding guide tube and the side of the upper movable plate close to the corresponding guide tube. Each of the adjusting screws is coaxially fixedly connected with a cylindrical head, and the cylindrical head is correspondingly rotatably fitted and connected in the T-slot.

[0014] As a further solution of the present invention: the adjustable lifting and alignment mechanism includes a conical positioning guide sleeve and a telescopic support rod, the conical positioning guide sleeve is coaxially arranged above the positioning steel needle, the conical positioning guide sleeve is used to dock with the detection pressure head, the telescopic support rod is connected to the bottom of the conical positioning guide sleeve, and a lateral adjustment mechanism is connected between the end of the telescopic support rod away from the conical positioning guide sleeve and the upper movable plate, the lateral adjustment mechanism is used to synchronously adjust the lateral position of the conical positioning guide sleeve and the positioning steel needle, and a rotation detection mechanism for detecting the measurement position surface of the test piece is provided on one side of the positioning steel needle, and the rotation detection mechanism is connected to the telescopic end of the telescopic support rod.

[0015] As a further solution of the present invention: the lateral adjustment mechanism includes a guide rail, a first telescopic square rod and a second telescopic square rod; the guide rail is arranged on one side of the upper movable plate, and the guide rail moves in the same direction as the sample positioning cylinder, a slide seat is slidably arranged in the guide rail, a limiting slide groove is also arranged on the inner wall of one side of the guide rail, one side of the slide seat is slidably engaged in the limiting slide groove, one side of the slide seat is threadedly connected with a second fastening bolt for fixing the position of the slide seat relative to the guide rail, the slide seat is provided with a slot, one end of the first telescopic square rod is inserted into the slot, the second telescopic square rod is horizontally fixedly connected to the other end of the first telescopic square rod, the telescopic end of the second telescopic square rod is fixedly connected to the telescopic support rod, the positioning steel needle is fixedly connected below the telescopic end of the second telescopic square rod, the second telescopic square rod is provided with a third fastening bolt for fixing the length of the second telescopic square rod, and the first telescopic square rod is provided with a fourth fastening bolt for fixing the length of the first telescopic square rod.

[0016] As a further solution of the present invention: the rotation detection mechanism includes a rotation drive mechanism, a first steering bevel gear, a second steering bevel gear and a leveling detection mechanism, the first steering bevel gear is rotationally connected to one side of the telescopic end of the second telescopic square rod, the second steering bevel gear is rotationally connected to the top of the positioning steel needle, and the first steering bevel gear is meshed with the second steering bevel gear, the first steering bevel gear is connected to the telescopic end of the telescopic support rod through the rotation drive mechanism, and the leveling detection mechanism rotates around the positioning steel needle with the second steering bevel gear.

[0017] As a further solution of the present invention: the rotary drive mechanism includes a rack, a spur gear and a transmission belt, the rack is fixedly connected to one side of the telescopic end of the telescopic support rod, the spur gear is rotatably connected to the outer wall of the telescopic support rod, and the rack is meshed with the spur gear, the first steering bevel gear is coaxially fixedly connected to the first transmission wheel, the spur gear is coaxially fixedly connected to the second transmission wheel, and the first transmission wheel and the second transmission wheel are connected by a transmission belt.

[0018] As a further solution of the present invention: the flatness detection mechanism includes a U-shaped fixed plate, a detection rotating plate, an alarm and a detection probe; the U-shaped fixed plate is fixedly connected to the bottom surface of the second steering bevel gear, the detection rotating plate is located on the inner side of the U-shaped fixed plate, and the side of the detection rotating plate close to the positioning steel needle is movably connected to the U-shaped fixed plate through a hinge, limiting springs are connected between the two sides of the detection rotating plate and the U-shaped fixed plate, pressure sensing switches electrically connected to the alarm are installed on the inner walls of the two sides of the U-shaped fixed plate facing the detection rotating plate, and a plurality of detection probes are provided, which are equidistantly fixed and distributed at the bottom of the detection rotating plate.

[0019] Beneficial effects of the present invention:

[0020] 1. The positioning steel needle of the present invention slides along the guide rail by means of the slide seat and the first telescopic square rod and the second telescopic square rod are telescoped, so as to be convenient for quickly aligning with the measuring position marked on the test piece. Since the positioning steel needle and the conical positioning guide sleeve are longitudinally coaxially aligned, the conical positioning guide sleeve is synchronously aligned with the measuring position, and the sample positioning tube can carry the test piece to rely on the guide tubes distributed in different directions to quickly and directly slide and adjust the position, so as to facilitate driving the conical positioning guide sleeve to quickly approach the position of the detection pressure head, and raise the conical positioning guide sleeve to cover the detection pressure head, and rely on the inner inclined surface of the conical positioning guide sleeve to guide, so as to facilitate quickly inserting the detection pressure head to the center position of the conical positioning guide sleeve, thereby realizing accurate alignment of the detection pressure head with the measurement position, and avoiding the need to rotate and twist the threaded adjustment member to improve the measurement efficiency.

[0021] 2. When the conical positioning guide sleeve of the present invention is connected with the detection pressure head for position alignment and adjustment, it is necessary to rely on the telescopic support rod to extend and retract to drive the conical positioning guide sleeve to move longitudinally. In this process, the telescopic support rod drives the set rack to drive the spur gear, and the spur gear drives the detection rotating plate with the detection probe to rotate around the positioning steel needle in the area where the measuring position is located through the transmission wheel, the transmission belt, the first steering bevel gear and the second steering bevel gear. When the surface is uneven, the movement of the moving detection probe is hindered, thereby causing the detection rotating plate to deflect and squeeze the pressure sensing switch, which is convenient for the alarm to operate and prompt the operator that the current detection position is not flat enough and is not suitable for detection. That is, the surface detection of the detection position is automatically realized in the process of position determination, without the need for manual operation, thus saving operation time.

[0022] 3. The sample positioning tube of the present invention can not only slide with the test piece by relying on the guide tubes in different directions to quickly adjust the initial position by long-distance displacement, but also can adjust the short-distance displacement by relying on the adjusting screw connected by the inner thread of the guide tube, so as to further improve the accuracy of the measurement position. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below in conjunction with the accompanying drawings.

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 It is a schematic diagram of the structure of the middle mounting plate and the mounting base in the present invention;

[0026] Figure 3 It is a structural schematic diagram of the upper movable plate in the present invention;

[0027] Figure 4 It is a schematic structural diagram of the sample positioning tube and the corresponding guide tube in the present invention;

[0028] Figure 5 yes Figure 4 A schematic diagram of the enlarged structure at A in the middle;

[0029] Figure 6 It is a structural schematic diagram of the relative position distribution of the tapered positioning guide sleeve, the rack, the first steering bevel gear and the second steering bevel gear in the present invention;

[0030] Figure 7 It is a structural schematic diagram of the relative position distribution of the detection probe and the positioning steel needle in the present invention;

[0031] Figure 8 It is a schematic diagram of the structure of the detection rotating plate and the U-shaped fixing plate in the present invention;

[0032] Fig. 9 It is a structural schematic diagram of the cooperation and docking of the measuring aid and the hardness testing machine disclosed in the present invention.

[0033] In the figure: 1, mounting base; 2, middle mounting plate; 3, upper moving plate; 4, specimen positioning cylinder; 5, specimen; 6, guide plate; 7, guide key; 8, sliding guide mechanism; 9, guide groove; 10, rotating column; 11, locking screw; 12, mounting slot; 13, guide tube; 14, connecting guide sleeve; 15, first fastening bolt; 16, adjusting screw; 17, T-slot; 18, cylindrical head; 19, guide rail; 20, first telescopic square rod; 21, second telescopic square rod; 22, third fastening bolt; 23, cone shaped positioning guide sleeve; 24, limiting slide groove; 25, slide seat; 26, second fastening bolt; 27, rack; 28, spur gear; 29, second transmission wheel; 30, transmission belt; 31, first transmission wheel; 32, first steering bevel gear; 33, second steering bevel gear; 34, U-shaped fixing plate; 35, telescopic support rod; 36, detection probe; 37, positioning steel needle; 38, detection rotating plate; 39, limiting spring; 40, pressure sensing switch; 41, loading round table; 42, hardness testing machine; 43, detection pressure head. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] like Figure 1-Figure 9 As shown, a precise position measurement auxiliary tool for a hardness tester includes a mounting base 1 and a sample positioning cylinder 4, the sample positioning cylinder 4 is used to clamp a test piece 5 that needs to be hard tested, and a mounting slot 12 is provided at the bottom of the mounting base 1 for matching with a loading table 41 of a hardness tester 42. The auxiliary tool also includes a measurement position positioning mechanism and a position adjustment mechanism; the measurement position positioning mechanism includes a positioning steel needle 37 and an adjustable lifting alignment mechanism, the positioning steel needle 37 is used to locate the hardness measurement position on the test piece 5; the adjustable lifting alignment mechanism and the positioning steel needle 37 move synchronously horizontally, and the adjustable lifting alignment mechanism is used to dock with a detection pressure head 43 of the hardness tester 42, so that the detection pressure head 43 is aligned with the positioning steel needle 37, so that the detection pressure head 43 is aligned with the hardness measurement position, which is convenient for measurement;

[0036] The position adjustment mechanism includes an upper movable plate 3 and an intermediate mounting plate 2. The upper movable plate 3 is slidably set on the intermediate mounting plate 2. The sample positioning cylinder 4 is slidably set on the upper movable plate 3, and the moving directions of the sample positioning cylinder 4 and the upper movable plate 3 are perpendicular to each other. After the positioning steel needle 37 is positioned to give the measuring position of the test piece 5, by moving the upper movable plate 3 and the sample positioning cylinder 4, the adjustable lifting alignment mechanism is conveniently aligned with the detection pressure head 43, and then docked, so that the detection pressure head 43 is aligned with the measurement position.

[0037] In some specific embodiments, such as Figures 1 to 3 As shown, a guide groove 9 is provided at the bottom of the upper movable plate 3, and a guide key 7 is fixedly connected to the middle mounting plate 2 and slides with the guide groove 9, and there are two guide grooves 9 and two guide keys 7 distributed in pairs, and the guide grooves 9 and the guide keys 7 slide with each other, so that the upper movable plate 3 can slide stably relative to the middle mounting plate 2.

[0038] In some specific embodiments, in combination Figure 1 and Figure 3As shown, the sample positioning cylinder 4 and the upper movable plate 3 are both equipped with a sliding guide mechanism 8, and the two sets of sliding guide mechanisms 8 include a connecting guide sleeve 14 and a guide tube 13. The connecting guide sleeve 14 corresponding to the sample positioning cylinder 4 is fixedly connected to one side of the upper movable plate 3, and the connecting guide sleeve 14 corresponding to the upper movable plate 3 is fixedly connected to one side of the intermediate mounting plate 2. The guide tubes 13 of the two sets of sliding guide mechanisms 8 are perpendicular to each other, and each guide tube 13 slides through the corresponding connecting guide sleeve 14. The sample positioning cylinder 4 and the upper movable plate 3 move synchronously with the corresponding guide tube 13, respectively. The connecting guide sleeve 14 is threadedly connected with a first fastening bolt 15 for fixing the guide tube 13. When the cylinder 4 moves with the specimen 5 along the X-axis direction, it relies on the corresponding guide tube 13 to slide and guide relative to the corresponding connecting guide sleeve 14. When the sample positioning cylinder 4 needs to move with the specimen 5 along the Y-axis direction, the upper movable plate 3 relies on the corresponding guide tube 13 to slide and guide relative to the corresponding connecting guide sleeve 14. Since the guide tube 13 can slide directly relative to the connecting guide sleeve 14 without the need for rotation and other operations, it is convenient for the sample positioning cylinder 4 to quickly determine the preliminary position of the specimen 5. When the measurement position on the specimen 5 is finally determined to be aligned with the detection pressure head 43, the corresponding guide tube 13 can be fixed relative to the connecting guide sleeve 14 by the first fastening bolt 15.

[0039] In other specific embodiments, each guide tube 13 is threadedly connected to the inside with an adjusting screw 16, the length of the adjusting screw 16 is greater than the length of the guide tube 13, the sample positioning cylinder 4 and the upper movable plate 3 are both provided with rotating connecting parts, and the sample positioning cylinder 4 and the upper movable plate 3 are respectively rotatably connected to the corresponding adjusting screw 16 through the corresponding rotating connecting parts.

[0040] Among them, the rotating connecting part includes a cylindrical head 18, and a T-slot 17 is provided on the side of the sample positioning cylinder 4 close to the corresponding guide tube 13 and the side of the upper movable plate 3 close to the corresponding guide tube 13. Each adjusting screw 16 is coaxially fixedly connected with a cylindrical head 18, and the cylindrical head 18 is correspondingly rotatably connected in the T-slot 17. When the sample positioning cylinder 4 and the upper movable plate 3 move, they can rely on the corresponding guide tube 13 for guided movement. After quickly and preliminarily determining the position, they can also rely on thread adjustment by rotating the adjusting screw 16 to facilitate short-distance displacement adjustment.

[0041] In addition, a guide plate 6 is fixedly connected to the upper movable plate 3 . Two guide plates 6 are provided and are parallel to the two sides of the sample positioning tube 4 . The guide plates 6 are used to guide the sample positioning tube 4 to move horizontally smoothly.

[0042] In some specific embodiments, such as Figure 6As shown, the adjustable lifting and alignment mechanism includes a conical positioning guide sleeve 23 and a telescopic support rod 35. The conical positioning guide sleeve 23 is coaxially arranged above the positioning steel needle 37. The conical positioning guide sleeve 23 is used to dock with the detection pressure head 43. The telescopic support rod 35 is connected to the bottom of the conical positioning guide sleeve 23. A lateral adjustment mechanism is connected between the end of the telescopic support rod 35 away from the conical positioning guide sleeve 23 and the upper movable plate 3. The lateral adjustment mechanism is used to synchronously adjust the lateral positions of the conical positioning guide sleeve 23 and the positioning steel needle 37, and a rotation detection mechanism for detecting the measurement position surface of the test piece 5 is provided on one side of the positioning steel needle 37, and the rotation detection mechanism is connected to the telescopic end of the telescopic support rod 35.

[0043] In some specific embodiments, such as Figure 4 and Figure 5As shown, the lateral adjustment mechanism includes a guide rail 19, a first telescopic square rod 20 and a second telescopic square rod 21; the guide rail 19 is arranged on one side of the upper movable plate 3, and the guide rail 19 moves in the same direction as the sample positioning tube 4, the guide rail 19 can be fixedly connected to the guide tube 13 corresponding to the sample positioning tube 4 through a bracket, the guide rail 19 is parallel to the guide tube 13 corresponding to the sample positioning tube 4, a slide seat 25 is slidably arranged in the guide rail 19, and a limiting slide groove 24 is also arranged on the inner wall of one side of the guide rail 19, and the outer wall of one side of the slide seat 25 is raised and slidably engaged in The limiting slide groove 24 can prevent the slide 25 from being separated from the guide rail 19, ensuring its stable sliding. The sliding direction of the slide 25 is the same as the sliding direction of the sample positioning cylinder 4. One side of the slide 25 is protruding and is threadedly connected with a second fastening bolt 26. The second fastening bolt 26 is facing the bottom of the guide rail 19, so that the bottom of the guide rail 19 is distributed with an anti-slip groove. When it is necessary to fix the position of the slide 25 relative to the guide rail 19, the second fastening bolt 26 is abutted against the bottom of the guide rail 19; the slide 25 is provided with a plug The first telescopic square rod 20 is parallel to the telescopic support rod 35, and the second telescopic square rod 21 is horizontally fixedly connected to the other end of the first telescopic square rod 20, and the two are perpendicular to each other. The second telescopic square rod 21 and the first telescopic square rod 20 are both square cross-sections and can only be telescopic. The telescopic end cannot rotate. The telescopic direction of the second telescopic square rod 21 is the same as the sliding direction of the upper movable plate 3; the telescopic end of the second telescopic square rod 21 is fixedly connected to the telescopic support rod 35, and the positioning steel needle 37 is fixedly connected to the lower part of the telescopic end of the second telescopic square rod 21. The second telescopic square rod 21 is provided with a third fastening bolt 22 for fixing the length of the second telescopic square rod 21. The second telescopic square rod 21 includes an outer sleeve and a sliding rod slidably inserted in the outer sleeve. The third fastening bolt 22 can be threadedly connected to the outer sleeve of the second telescopic square rod 21, and then abuts against the sliding rod inserted in the outer sleeve; similarly, the first telescopic square rod 20 is provided with a fourth fastening bolt for fixing the length of the first telescopic square rod 20;After the test piece 5 is marked with the measuring position in advance, it is placed in the test piece positioning tube 4. The first telescopic square rod 20 is extended and retracted to make the positioning steel needle 37 descend and contact the surface of the test piece 5. The slide seat 25 slides along the guide rail 19 to adjust the position of the positioning steel needle 37 and the tapered positioning guide sleeve 23 in the X-axis direction. At the same time, the second telescopic square rod 21 is extended and retracted to adjust the position of the positioning steel needle 37 and the tapered positioning guide sleeve 23 in the Y-axis direction, so that the positioning steel needle 37 is aligned with the measuring position marked on the test piece 5. In this way, the tapered positioning guide sleeve 23 is also aligned with the measuring position. Then, the position of the slide seat 25 relative to the guide rail 19 is fixed by the second fastening bolt 26, the length of the first telescopic square rod 20 is fixed by the fourth fastening bolt, and the length of the second telescopic square rod 21 is fixed by the third fastening bolt 22. In this way, the positioning steel needle 37, the tapered positioning guide sleeve 23, and the test piece 5 are fixed relative to the test piece positioning tube 4. Then, the guide tubes 13 in different directions can be used to quickly adjust the X-axis and Y-axis. The sample positioning cylinder 4 is moved in the axial direction, and the conical positioning guide sleeve 23 is driven by the sample positioning cylinder 4 to quickly move close to the detection pressure head 43, and the telescopic support rod 35 is operated to extend during the approaching process, so that the conical positioning guide sleeve 23 is raised to cover the detection pressure head 43, and the detection pressure head 43 is finally inserted to the center position of the conical positioning guide sleeve 23 by the inner conical inclined surface of the conical positioning guide sleeve 23. Since the conical positioning guide sleeve 23 is coaxially aligned with the positioning steel needle 37, the detection pressure head 43 and the positioning steel needle 37 are aligned. 37 are coaxially aligned, so that the detection pressure head 43 is aligned with the measuring position on the test piece 5, and then the guide tubes 13 at different positions are fixed. Since the first telescopic square rod 20 is plugged into the slide 25 and can be detached, the telescopic support rod 35 can be retracted to lower the conical positioning guide sleeve 23 to separate it from the detection pressure head 43, and then the first telescopic square rod 20 is separated from the slide 25, and the conical positioning guide sleeve 23 and the positioning steel needle 37 are removed and separated from the top of the test piece 5 to avoid hindering the hardness measurement. ;

[0044] In some specific embodiments, such as Figure 6 As shown, the rotation detection mechanism includes a rotation drive mechanism, a first steering bevel gear 32, a second steering bevel gear 33 and a flatness detection mechanism. The first steering bevel gear 32 is rotationally connected to one side of the telescopic end of the second telescopic square rod 21 through a rotating shaft, and the second steering bevel gear 33 is rotationally connected to the top of the positioning steel needle 37. The second steering bevel gear 33 rotates around the positioning steel needle 37, and the first steering bevel gear 32 is meshed with the second steering bevel gear 33. The first steering bevel gear 32 is connected to the telescopic end of the telescopic support rod 35 through the rotation drive mechanism. The flatness detection mechanism rotates around the positioning steel needle 37 with the second steering bevel gear 33, and is used to detect whether the measuring position of the test piece 5 is flat.

[0045] Among them, the rotary drive mechanism includes a rack 27, a spur gear 28 and a transmission belt 30. The rack 27 is fixedly connected to one side of the telescopic end of the telescopic support rod 35 through a bracket. The spur gear 28 is rotatably connected to the outer wall of the telescopic support rod 35 through a rotating shaft. The spur gear 28 does not rise and fall synchronously with the conical positioning guide sleeve 23, and the rack 27 is meshed with the spur gear 28. The first steering bevel gear 32 is coaxially fixedly connected to the first transmission wheel 31, and the spur gear 28 is coaxially fixedly connected to the second transmission wheel 29. The first transmission wheel 31 and the second transmission wheel 29 are connected by a transmission belt 30.

[0046] When the conical positioning guide sleeve 23 is raised and lowered by extending and retracting the telescopic support rod 35, the rack 27 is also raised and lowered, so that the rack 27 drives the spur gear 28 to rotate, and the spur gear 28 drives the first steering bevel gear 32 to rotate through the first transmission wheel 31. The second transmission wheel 29 and the transmission belt 30 mobilize the first steering bevel gear 32 to rotate, and the first steering bevel gear 32 drives the second steering bevel gear 33 to rotate, so that the second steering bevel gear 33 can drive the leveling detection mechanism to rotate around the positioning steel needle 37. It should be noted that when the conical positioning guide sleeve 23 is docked with the detection pressure head 43 and the detection pressure head 43 is inserted in the center position of the conical positioning guide sleeve 23, the telescopic support rod 35 needs to bring the conical positioning guide sleeve 23 down to reset, and then be removed from the auxiliary tool. The descending distance in this process can make the leveling detection mechanism rotate one circle.

[0047] In some specific embodiments, in combination Figure 7 and Figure 8As shown, the flatness detection mechanism includes a U-shaped fixed plate 34, a detection rotating plate 38, an alarm and a detection probe 36; the U-shaped fixed plate 34 is fixedly connected to the bottom surface of the second steering bevel gear 33 through a bracket, the detection rotating plate 38 is located on the inner side of the U-shaped fixed plate 34, and the side of the detection rotating plate 38 close to the positioning steel needle 37 is movably connected to the U-shaped fixed plate 34 through a hinge, and the other side is a movable end, and the two sides of the detection rotating plate 38 are connected to the U-shaped fixed plate 34 with compressible or bending limit springs. 39, pressure sensing switches 40 electrically connected to the alarm are installed on both sides of the U-shaped fixing plate 34 facing the inner wall of the detection rotating plate 38, and the alarm can be fixedly installed on the upper movable plate 3, and a plurality of detection probes 36 are provided, and are equidistantly fixed and distributed at the bottom of the detection rotating plate 38, and the bottom end of the detection probe 36 is flush with the bottom end of the positioning steel needle 37. In order to prevent the detection probe 36 from being easily bent, the detection probe 36 is made of steel material with good bending resistance. When the positioning steel needle 37 is aligned and contacts the mark on the test piece 5 When the measuring position is recorded, the detection probe 36 also contacts the surface of the area where the measuring position of the specimen 5 is located. When the conical positioning guide sleeve 23 is aligned with the detection pressure head 43 and then lowered to reset, the second steering bevel gear 33 rotates around the positioning steel needle 37, which drives the U-shaped fixing plate 34 to rotate around the positioning steel needle 37. In this way, the detection probes 36 distributed laterally and equidistantly rotate around the positioning steel needle 37 and move along the surface of the area where the measuring position of the specimen 5 is located. When there are unevenness or grooves in the area where the measuring position of the specimen 5 is located, the detection probe 36 will be obstructed during the movement, resulting in the deflection of the detection rotating plate 38 relative to the U-shaped fixing plate 34, thereby squeezing the pressure sensing switch 40 on one side, which will trigger the alarm, conveniently reminding the detection operator that the surface of the current detection position is not flat enough and is not suitable for detection, that is, the detection position detection is realized in the process of aligning the detection pressure head 43 with the detection position. If the detection is qualified, the hardness test is directly carried out. If it is unqualified, the marking position is replaced.

[0048] It should be noted that, since the surface layers detected by the detection probe 36 here are basically not directly observable by the naked eye, the surface problems observable by the naked eye will be directly replaced when marking the measurement position.

[0049] Furthermore, a brush may be installed on the outside of the U-shaped fixing plate 34 to clean the area where the measuring position is located during the rotation process to remove attached particles and debris.

[0050] In some specific implementation schemes, in order to facilitate the sliding of the detection probe 36 and the positioning steel needle 37 on the surface of the test piece 5, a ball is embedded at the bottom end of the detection probe 36 and the positioning steel needle 37, similar to the tip structure of a ballpoint pen.

[0051] In some specific embodiments, in order to further facilitate the adjustment of the position of the test piece 5, such as Figure 2As shown, a rotating column 10 is fixedly connected to the bottom of the middle mounting plate 2, and the rotating column 10 is rotatably connected to the mounting base 1, and a locking screw 11 is threadedly connected to one side of the mounting base 1. A wrench slot is provided at one end of the locking screw 11, and the other end is passed through the mounting position of the rotating column 10, so that after the orientation is adjusted by rotating the rotating column 10, the rotating column 10 can be tightened by the locking screw 11, so that the position of the middle mounting plate 2 is fixed relative to the mounting base 1.

[0052] In order to facilitate the understanding of the embodiments of this solution by those skilled in the art, the working principle of this solution is briefly described in combination with specific application scenarios:

[0053] First, mark the measuring position on the specimen 5 with a marker pen in advance, then put the specimen 5 into the paper sample positioning tube 4, and connect the entire auxiliary tool with the object stage 41 on the hardness tester 42 through the mounting slot 12 at the bottom of the mounting base 1, and then extend and retract the first telescopic square rod 20 to make the positioning steel needle 37 descend and contact the surface of the specimen 5, and slide along the guide rail 19 by the slide seat 25 to adjust the position of the positioning steel needle 37 and the conical positioning guide sleeve 23 in the X-axis direction, and at the same time, by the telescopic movement of the second telescopic square rod 21, adjust the position of the positioning steel needle 37 and the conical positioning guide sleeve 23 in the Y-axis direction, so as to facilitate the positioning steel needle 37 to align with the measuring position marked on the specimen 5. Since the conical positioning guide sleeve 23 and the positioning steel needle 37 are longitudinally coaxially aligned, the conical positioning guide sleeve 23 is also aligned with the measuring position;

[0054] Then, the position of the slide 25 relative to the guide rail 19 is fixed by the second fastening bolt 26, the length of the first telescopic square rod 20 is fixed by the fourth fastening bolt, and the length of the second telescopic square rod 21 is fixed by the third fastening bolt 22, so that the positioning steel needle 37, the conical positioning guide sleeve 23, and the test piece 5 are fixed relative to the test piece positioning tube 4. Since the guide tube 13 provided can directly slide relative to the connecting guide sleeve 14 without the need for rotation and other operations, the test piece 5 and the conical positioning guide sleeve 23 in the test piece positioning tube 4 can be quickly moved in the X-axis and Y-axis directions by relying on the guide tubes 13 in different directions, so that the conical positioning guide sleeve 23 can be quickly moved close to the detection pressure head 43 on the hardness testing machine 42, and the position can be quickly and preliminarily determined;

[0055] In this process, the telescopic support rod 35 is extended, so that the conical positioning guide sleeve 23 is lifted up and covers the approaching detection pressure head 43, that is, the detection pressure head 43 is relatively inserted into the conical positioning guide sleeve 23, and is guided by the conical inclined surface inside the conical positioning guide sleeve 23, so that the detection pressure head 43 is finally inserted into the center position of the conical positioning guide sleeve 23. The above-mentioned longitudinal lifting of the conical positioning guide sleeve 23 can be synchronized with the lateral movement in different directions. Since the conical positioning guide sleeve 23 is coaxially aligned with the positioning steel needle 37, the detection pressure head 43 is realized. The positioning steel needle 37 is coaxially aligned to achieve alignment of the detection pressure head 43 with the measuring position on the test piece 5, and then the guide tubes 13 at different positions are fixed. Since the first telescopic square rod 20 is plugged into the slide 25 and can be detached, the telescopic support rod 35 can be retracted to lower the conical positioning guide sleeve 23 to make it detach from the detection pressure head 43, and then the first telescopic square rod 20 is separated from the slide 25, and the conical positioning guide sleeve 23 and the positioning steel needle 37 are removed and separated from the top of the test piece 5 to avoid interfering with the hardness measurement.

[0056] After the conical positioning guide sleeve 23 is aligned with the detection pressure head 43, the telescopic support rod 35 is contracted and lowered to reset, and the rack 27 moves synchronously, and the rack 27 drives the spur gear 28 to rotate, and the spur gear 28 drives the first steering bevel gear 32 to rotate through the first transmission wheel 31, the second transmission wheel 29 and the transmission belt 30, and the first steering bevel gear 32 drives the second steering bevel gear 33 to rotate;

[0057] When the second steering bevel gear 33 rotates around the positioning steel needle 37, it drives the U-shaped fixing plate 34 to rotate around the positioning steel needle 37, so that the detection probes 36 distributed equidistantly laterally rotate around the positioning steel needle 37 and move along the surface of the area where the measurement position of the test piece 5 is located. When there are unevenness or grooves in the area where the measurement position of the test piece 5 is located, the detection probe 36 will be obstructed during the movement, causing the detection rotating plate 38 to deflect relative to the U-shaped fixing plate 34, thereby squeezing the pressure sensing switch 40 on one side, which will trigger the alarm, conveniently reminding the detection operator that the surface of the current detection position has unevenness or grooves or cracks that are difficult to detect with the naked eye, which affect the surface flatness and is not suitable for detection.

[0058] Several embodiments of the present invention are described in detail above, but the embodiments of the present invention are not limited thereto and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A precise position measurement auxiliary tool for a hardness tester, comprising a mounting base (1) and a sample positioning cylinder (4), wherein a mounting slot (12) is provided at the bottom of the mounting base (1), characterized in that: Also includes: A measurement position positioning mechanism, the measurement position positioning mechanism comprising a positioning steel needle (37) and an adjustable lifting alignment mechanism, the positioning steel needle (37) being used to position a hardness measurement position on a test piece (5); the adjustable lifting alignment mechanism and the positioning steel needle (37) moving laterally synchronously, and the adjustable lifting alignment mechanism being used to dock with a detection pressure head (43) of a hardness testing machine (42), so that the detection pressure head (43) is aligned with the positioning steel needle (37); The position adjustment mechanism comprises an upper movable plate (3) and an intermediate mounting plate (2), wherein the upper movable plate (3) is slidably arranged on the intermediate mounting plate (2), and the sample positioning cylinder (4) is slidably arranged on the upper movable plate (3), and the moving directions of the sample positioning cylinder (4) and the upper movable plate (3) are perpendicular to each other.

2. The precise position measurement aid for a hardness tester according to claim 1, characterized in that: A guide groove (9) is provided at the bottom of the upper movable plate (3), and a guide key (7) which is slidably matched with the guide groove (9) is fixedly connected to the intermediate mounting plate (2).

3. The precise position measurement aid for a hardness tester according to claim 1, characterized in that: The sample positioning cylinder (4) and the upper movable plate (3) are both provided with a sliding guide mechanism (8). The two sets of the sliding guide mechanisms (8) both include a connecting guide sleeve (14) and a guide tube (13). The connecting guide sleeve (14) corresponding to the sample positioning cylinder (4) is fixedly connected to one side of the upper movable plate (3). The connecting guide sleeve (14) corresponding to the upper movable plate (3) is fixedly connected to one side of the intermediate mounting plate (2). The guide tubes (13) of the two sets of the sliding guide mechanisms (8) are perpendicular to each other, and each guide tube (13) slides through the corresponding connecting guide sleeve (14). The sample positioning cylinder (4) and the upper movable plate (3) respectively move synchronously with the corresponding guide tube (13). The connecting guide sleeve (14) is threadedly connected with a first fastening bolt (15) for fixing the guide tube (13).

4. The precise position measurement aid for a hardness tester according to claim 3, characterized in that: Each guide tube (13) is internally threadedly connected with an adjusting screw (16), and the sample positioning tube (4) and the upper movable plate (3) are both provided with rotating connecting pieces, and the sample positioning tube (4) and the upper movable plate (3) are respectively rotatably connected to the corresponding adjusting screw (16) via the corresponding rotating connecting pieces.

5. The precise position measurement aid for a hardness tester according to claim 4, characterized in that: The rotating connecting member comprises a cylindrical head (18), a T-slot (17) is provided on the side of the sample positioning cylinder (4) close to the corresponding guide tube (13) and a T-slot (17) is provided on the side of the upper movable plate (3) close to the corresponding guide tube (13), each of the adjusting screws (16) is coaxially fixedly connected with a cylindrical head (18), and the cylindrical head (18) is correspondingly rotatably matched and connected in the T-slot (17).

6. The precise position measurement aid for a hardness tester according to claim 1, characterized in that: The adjustable lifting and alignment mechanism comprises a conical positioning guide sleeve (23) and a telescopic support rod (35), wherein the conical positioning guide sleeve (23) is coaxially arranged above the positioning steel needle (37), the conical positioning guide sleeve (23) is used to dock with the detection pressure head (43), the telescopic support rod (35) is connected to the bottom of the conical positioning guide sleeve (23), and a lateral adjustment mechanism is connected between the end of the telescopic support rod (35) away from the conical positioning guide sleeve (23) and the upper movable plate (3), and the lateral adjustment mechanism is used to synchronously adjust the lateral position of the conical positioning guide sleeve (23) and the positioning steel needle (37), and a rotation detection mechanism for detecting the measurement position surface of the test piece (5) is arranged on one side of the positioning steel needle (37), and the rotation detection mechanism is connected to the telescopic end of the telescopic support rod (35).

7. The precise position measurement aid for a hardness tester according to claim 6, characterized in that: The lateral adjustment mechanism comprises a guide rail (19), a first telescopic square rod (20) and a second telescopic square rod (21); the guide rail (19) is arranged on one side of the upper movable plate (3), and the guide rail (19) moves in the same direction as the sample positioning cylinder (4); a slide seat (25) is slidably arranged in the guide rail (19); a limiting slide groove (24) is also provided on the inner wall of one side of the guide rail (19); one side of the slide seat (25) is slidably engaged in the limiting slide groove (24); one side of the slide seat (25) is threadedly connected with a second fastening bolt (26) for fixing the position of the slide seat (25) relative to the guide rail (19); A slot is provided, one end of the first telescopic square rod (20) is inserted into the slot, the second telescopic square rod (21) is horizontally fixedly connected to the other end of the first telescopic square rod (20), the telescopic end of the second telescopic square rod (21) is fixedly connected to the telescopic support rod (35), the positioning steel needle (37) is fixedly connected below the telescopic end of the second telescopic square rod (21), the second telescopic square rod (21) is provided with a third fastening bolt (22) for fixing the length of the second telescopic square rod (21), and the first telescopic square rod (20) is provided with a fourth fastening bolt for fixing the length of the first telescopic square rod (20).

8. The precise position measurement aid for a hardness tester according to claim 7, characterized in that: The rotation detection mechanism comprises a rotation drive mechanism, a first steering bevel gear (32), a second steering bevel gear (33) and a flattening detection mechanism, wherein the first steering bevel gear (32) is rotationally connected to one side of the telescopic end of the second telescopic square rod (21), the second steering bevel gear (33) is rotationally connected to the top of the positioning steel needle (37), and the first steering bevel gear (32) is meshed with the second steering bevel gear (33), the first steering bevel gear (32) is cooperatively connected with the telescopic end of the telescopic support rod (35) through the rotation drive mechanism, and the flattening detection mechanism rotates around the positioning steel needle (37) along with the second steering bevel gear (33).

9. The precise position measurement aid for a hardness tester according to claim 8, characterized in that: The rotary drive mechanism comprises a rack (27), a spur gear (28) and a transmission belt (30); the rack (27) is fixedly connected to one side of the telescopic end of the telescopic support rod (35); the spur gear (28) is rotatably connected to the outer wall of the telescopic support rod (35); the rack (27) is meshed with the spur gear (28); the first steering bevel gear (32) is coaxially fixedly connected to a first transmission wheel (31); the spur gear (28) is coaxially fixedly connected to a second transmission wheel (29); the first transmission wheel (31) and the second transmission wheel (29) are matched and connected via a transmission belt (30).

10. The precise position measurement aid for a hardness tester according to claim 8, characterized in that: The flatness detection mechanism comprises a U-shaped fixed plate (34), a detection rotating plate (38), an alarm and a detection probe (36); the U-shaped fixed plate (34) is fixedly connected to the bottom surface of the second steering bevel gear (33), the detection rotating plate (38) is located on the inner side of the U-shaped fixed plate (34), and the side of the detection rotating plate (38) close to the positioning steel needle (37) is movably connected to the U-shaped fixed plate (34) through a hinge, and limiting springs (39) are connected between the two sides of the detection rotating plate (38) and the U-shaped fixed plate (34), and pressure sensing switches (40) electrically connected to the alarm are installed on the inner walls of the two sides of the U-shaped fixed plate (34) facing the detection rotating plate (38), and a plurality of detection probes (36) are provided, and are equidistantly fixed and distributed at the bottom of the detection rotating plate (38).

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