Portable residual stress meter

Abstract

The utility model discloses a portable residual stress meter which comprises a testing mechanism, a fixing mechanism and an aim point adjusting mechanism connected with the testing mechanism and the fixing mechanism. The test mechanism comprises a mounting seat, a pressing assembly arranged on the inner side of the mounting seat, a micro electric drill arranged at the lower end of the pressing assembly, a strain gauge arranged on a test piece, and a data analysis unit electrically connected with the strain gauge; the downward pressing assembly moves on the inner side of the installation base in the vertical direction. According to the utility model, through the cooperative arrangement of the testing mechanism, the fixing mechanism and the aim point adjusting mechanism, test pieces with various shapes and sizes can be fixed, and through the aim point adjusting mechanism, the drill center of a micro electric drill is aligned with the center of a strain gauge to drill a micro blind hole, so that the problem that in the prior art, the precision is high is solved. And a micro blind hole cannot be accurately drilled in the center of the strain gauge, so that the measured residual stress size and direction are not accurate enough.

Description

TECHNICAL FIELD

[0001] The utility model relates to stress test technical field especially relates to a portable residual stress appearance. BACKGROUND

[0002] Residual stress refers to the action and influence of various process factors on the component during the manufacturing process; when these factors disappear, if the above-mentioned action and influence of the component cannot completely disappear, and part of the action and influence remains in the component, then the remaining action and influence is called residual stress or residual stress.

[0003] The commonly used residual stress measurement is the blind hole method, that is, a strain gauge is attached to the measured part of the workpiece, a small blind hole with a diameter of about 2mm is punched in the center of the strain gauge to cause the release of residual stress, and the release amount is measured by a residual stress tester, and the size and direction of the residual stress of the part are calculated.

[0004] The prior art CN219391189U discloses a portable stress tester, which comprises a test piece, a strain gauge, a stress tester body, a cylinder, a support rod b, a lifting column and a spring; the strain gauge is arranged on the test piece, and the strain gauge is electrically connected with the stress tester body; support rings a and b are arranged on the bottom and the outer wall of the top of the cylinder respectively, four groups of support rods a are arranged horizontally and equidistantly on the outer wall of the support ring a; a sleeve is arranged on the top of the support rod b, the sleeve is sleeved on the support rod a, a locking bolt is arranged on the sleeve, and an adsorption assembly connected with the test piece is arranged at the bottom of the support rod b; the lifting column penetrates through the cylinder, an electric drill is arranged at the bottom of the lifting column, a drill bit is vertically arranged at the bottom of the electric drill, and a pressing plate is arranged at the top of the lifting column; the spring is sleeved on the cylinder, and the two ends of the spring are connected with the support ring b and the pressing plate respectively. The utility model has no size limit for the test piece, and can successfully complete the measurement of residual stress, and has a wide range of application.

[0005] However, the above-mentioned prior art cannot guarantee that the drill bit is directly opposite the center of the strain gauge when fixing the test piece or punching a blind hole on the strain gauge, so that the size and direction of the measured residual stress are not accurate enough.

[0006] Therefore, it is necessary to provide a portable residual stress tester to solve the above-mentioned technical problems. SUMMARY

[0007] The utility model overcomes the insufficient prior art and provides a portable residual stress tester.

[0008] In order to achieve the above-mentioned purpose, the utility model adopts the technical scheme that a portable residual stress tester comprises a test mechanism, a fixing mechanism, and a center adjustment mechanism connecting the test mechanism and the fixing mechanism.

[0009] The testing mechanism comprises a mounting seat, a pressing assembly arranged inside the mounting seat, a micro electric drill arranged at the lower end of the pressing assembly, a strain gauge arranged on a testing piece, and a data analysis unit electrically connected with the strain gauge; the pressing assembly moves in the vertical direction inside the mounting seat;

[0010] The fixing mechanism comprises a connecting arm, support rods arranged at both ends of the connecting arm, and a connecting sleeve sleeved outside the connecting arm; the lower end of the support rod is provided with a magnetic base;

[0011] The centering adjusting mechanism comprises an adjusting hole arranged on the surface of the mounting seat, an adjusting rod arranged on the surface of the connecting sleeve and matched with the adjusting hole, and a rack arranged on one side of the connecting arm;

[0012] The adjusting rod is threadedly connected with the adjusting hole, and the outer surface of the adjusting rod is rotationally connected with the connecting sleeve; one side of the connecting sleeve is provided with a rack groove and a gear groove, the rack is movably arranged in the rack groove, an adjusting gear is arranged in the gear groove, and the adjusting gear is meshingly connected with the rack.

[0013] In a preferred embodiment of the utility model, the pressing assembly comprises a cylinder arranged inside the mounting seat, and an extension rod arranged in the cylinder; the outer surface of the cylinder is provided with a first supporting ring; the upper end of the extension rod is provided with a pressing plate, and the lower end of the extension rod is connected with the micro electric drill; the outer part of the extension rod is sleeved with a spring, and the two ends of the spring are respectively connected with the pressing plate and the first supporting ring.

[0014] In a preferred embodiment of the utility model, the outer surface of the extension rod is threadedly connected with the inner side surface of the cylinder, and the outer surface of the cylinder is rotationally connected with the mounting seat.

[0015] In a preferred embodiment of the utility model, the outer surface of the cylinder is further provided with a second supporting ring, and the outer edge of the second supporting ring is provided with a plurality of protrusions.

[0016] In a preferred embodiment of the utility model, the two ends of the connecting arm are provided with mounting holes penetrating from top to bottom, and the support rods are inserted into the mounting holes; the support rods are vertically arranged threaded rods, the outer surface of the support rods is threadedly connected with height adjusting sleeves, and the upper surface of the height adjusting sleeves abuts against the lower surface of the support rods.

[0017] In a preferred embodiment of the utility model, the surface of the mounting seat is provided with a plurality of insertion holes, the surface of the connecting sleeve is provided with a plurality of insertion rods matched with the insertion holes, and the plurality of insertion rods are respectively inserted into the corresponding insertion holes.

[0018] In a preferred embodiment of the utility model, the depth of the gear groove is less than the thickness of the connecting sleeve, and the gear is rotationally connected with the inner wall of the gear groove.

[0019] In a preferred embodiment of the utility model, the outer surface of the gear is provided with a one-character or cross-shaped notch.

[0020] In a preferred embodiment of the utility model, the support rod is provided with a movable arm at one end of the connecting arm, and the other end of the movable arm is also provided with a support rod.

[0021] In a preferred embodiment of the utility model, the movable arm is sleeved on the support rod, and the movable arm is movably connected with the connecting arm.

[0022] The utility model solves the defects in the background art, and has the following beneficial effects:

[0023] (1) The utility model provides a portable residual stress instrument, through the cooperation of the test mechanism, the fixing mechanism and the center adjustment mechanism, various shapes and sizes of test pieces can be fixed, and through the center adjustment mechanism, the center of the micro drill is aligned with the center of the strain gauge to drill micro blind holes, so that the problem that the micro blind holes cannot be accurately drilled on the center of the strain gauge in the prior art is solved, and the size and direction of the measured residual stress are not accurate enough.

[0024] (2) The utility model sets up a fixing mechanism, the movable arm is arranged at one end of the connecting arm and is movable relative to the connecting arm, that is, the utility model has three support rods, two positions are fixed, and the other position can be adjusted according to the shape and size of the test piece, so that the test mechanism is stable, and various shapes and sizes of test pieces can be fixed.

[0025] (3) The utility model sets up a center adjustment mechanism, the mounting seat and the connecting sleeve are connected through the matched adjusting rod and adjusting hole, the distance between the mounting seat and the connecting sleeve is controlled by rotating the adjusting rod, X-axis movement is realized. In addition, the connecting sleeve is provided with a gear, the connecting arm is provided with a rack, the gear and the rack are engaged, the position of the connecting sleeve on the connecting arm can be adjusted by rotating the gear, Y-axis movement is realized. The two structure combinations are the center adjustment mechanism, the plane position adjustment of the test mechanism is realized, the center of the micro drill can be aligned with the center of the strain gauge to drill micro blind holes after the test piece is fixed, and the measurement accuracy of the residual stress is improved. BRIEF DESCRIPTION OF DRAWINGS

[0026] The utility model will be further described in connection with the drawings and embodiments;

[0027] Figure 1is a perspective view of the preferred embodiment of the utility model;

[0028] Figure 2 is another angle perspective view of the preferred embodiment of the utility model;

[0029] Figure 3 is a rear view of the preferred embodiment of the utility model;

[0030] Figure 4 is a perspective view of the test mechanism of the preferred embodiment of the utility model;

[0031] Figure 5 is a perspective view of the connecting sleeve of the preferred embodiment of the utility model.

[0032] In the drawing: 1, test mechanism;11, mounting seat;12, lower pressing assembly;13, micro electric drill;14, strain gauge;15, data analysis unit;121, cylinder body;122, telescopic rod;123, first support ring;124, pressing plate;125, spring;126, second support ring;127, protrusion;2, fixing mechanism;21, connecting arm;22, support rod;23, connecting sleeve;24, magnetic base;25, mounting hole;26, height adjusting sleeve;27, movable arm;3, centring adjustment mechanism;31, adjusting hole;32, adjusting rod;33, rack;34, jack;35, jack rod;36, rack groove;37, gear groove;38, gear. DETAILED DESCRIPTION

[0033] The utility model will be explained further in detail in combination with the drawings and embodiments, these drawings are all simplified schematic view, only with the schematic way shows the basic structure of the utility model, therefore it shows only the related structure of the utility model.

[0034] As Figure 1 And Figure 2 Show, a kind of portable residual stress instrument, include: test mechanism 1, fixed mechanism 2 and the centring adjustment mechanism 3 of the connection test mechanism 1 and fixed mechanism 2;Centring adjustment mechanism 3 is used to adjust the horizontal position of test mechanism 1 on fixed mechanism 2.Test mechanism 1 include: mounting seat 11, the lower pressing assembly 12 of setting in the inside of mounting seat 11, the micro electric drill 13 of setting in the lower end of lower pressing assembly 12, the strain gauge 14 of setting on test piece and the data analysis unit 15 of being electrically connected with strain gauge 14;Lower pressing assembly 12 moves in the inside of mounting seat 11 along vertical direction, by micro electric drill 13 to test piece exert pressure, to thereby cause strain.

[0035] It is worth mentioning that the strain gauge 14 is in close contact with the surface of the test piece, captures the tiny deformation signal, and transmits the signal to the data analysis unit 15. The data analysis unit 15 is a static resistance strain gauge, which is responsible for receiving, processing and analyzing the data transmitted by the strain gauge 14, and finally obtaining the accurate value of the residual stress.

[0036] The fixing mechanism 2 in the embodiment comprises a connecting arm 21, support rods 22 arranged at both ends of the connecting arm 21, and a connecting sleeve 23 sleeved outside the connecting arm 21; the lower end of the support rod 22 is provided with a magnetic base 24.

[0037] In one embodiment, a universal joint is further connected between the support rod 22 and the magnetic base 24.

[0038] The connecting arm 21 is a rectangular tube, and the four edges are provided with chamfers. The connecting sleeve 23 cooperates with the connecting arm 21, and the outer surface of the connecting arm 21 is slidingly connected with the inner wall of the connecting sleeve 23, so that the connecting arm 21 can move along the axial direction.

[0039] The connecting arm 21 in the embodiment is provided with a mounting hole 25 penetrating from top to bottom at both ends, and the support rod 22 is inserted into the mounting hole 25; the support rod 22 is a vertical threaded rod, and a height adjusting sleeve 26 is threadedly connected to the outer surface of the support rod 22; the upper surface of the height adjusting sleeve 26 abuts against the lower surface of the support rod 22, and the position of the height adjusting sleeve 26 on the support rod 22 is controlled by rotating the height adjusting sleeve 26, so that the height adjusting sleeve 26 also supports the position stability of the connecting arm 21.

[0040] As shown in FIGS. Figure 3 and Figure 5 The centration adjusting mechanism 3 comprises an adjusting hole 31 arranged on the surface of the mounting seat 11, an adjusting rod 32 arranged on the surface of the connecting sleeve 23 and matched with the adjusting hole 31, and a rack 33 arranged on one side of the connecting arm 21; the adjusting rod 32 is threadedly connected with the adjusting hole 31, and the outer surface of the adjusting rod 32 is rotatably connected with the connecting sleeve 23, that is, a sleeve ring is arranged on the upper surface of the connecting sleeve 23, and the outer surface of the adjusting rod 32 is rotatably connected with the sleeve ring through a ball bearing; one side of the connecting sleeve 23 is provided with a rack groove 36 and a gear groove 37, the rack 33 is movably arranged in the rack groove 36, and an adjusting gear 38 is arranged in the gear groove 37 and engaged with the rack 33.

[0041] The depth of the gear groove 37 is less than the thickness of the connecting sleeve 23, and the gear 38 is rotatably connected with the inner wall of the gear groove 37; the outer surface of the gear 38 is provided with a one-letter or cross-shaped notch, or a rotating handle of a protrusion 127, for rotating the gear 38; by rotating the gear 38, the rack 33 is not moved under the meshing action of the gear 38 and the rack 33, the connecting sleeve 23 is driven, and then the test assembly is moved along the axial direction of the connecting arm 21.

[0042] The utility model sets up the centering adjustment mechanism 3, and the connecting sleeve 23 between the mounting base 11 is connected through the adapting adjusting lever 32 and the adjusting hole 31, and the distance between the mounting base 11 and the connecting sleeve 23 is controlled by rotating the adjusting lever 32, realizes X axis movement. In addition, the connecting sleeve 23 is provided with gear 38, and the connecting arm 21 is provided with rack 33, and the gear 38 and the rack 33 are engaged, and the position of the connecting sleeve 23 on the connecting arm 21 can be adjusted by rotating the gear 38, realizes Y axis movement. Two structure combinations are the centering adjustment mechanism 3, realize the plane position adjustment of test mechanism 1, can after the test piece is fixed, the center of micro electric drill 13 is aligned with the center of strain gauge 14 and is carried out the drilling of micro blind hole, improves the measurement accuracy of residual stress.

[0043] As shown in Figure 4 The lower pressing assembly 12 includes: a cylinder 121 arranged on the inner side of the mounting base 11, and a telescopic rod 122 arranged in the cylinder 121; the outer surface of the cylinder 121 has a first support ring 123; the upper end of the telescopic rod 122 is provided with a pressing plate 124, and the lower end of the telescopic rod 122 is connected with the micro electric drill 13; the outer part of the telescopic rod 122 is sleeved with a spring 125, and the two ends of the spring 125 are respectively connected with the pressing plate 124 and the first support ring 123. The outer surface of the telescopic rod 122 is threadedly connected with the inner side of the cylinder 121, and the outer surface of the cylinder 121 is rotatably connected with the mounting base 11 through a ball bearing; the outer surface of the cylinder 121 is further provided with a second support ring 126, and the outer edge of the second support ring 126 is provided with a plurality of protrusions 127, which facilitates the rotation of the cylinder 121.

[0044] The mounting base 11 in the embodiment is provided with a plurality of insertion holes 34 on the surface, and the connecting sleeve 23 is provided with a plurality of insertion rods 35 matched with the insertion holes 34 on the surface, and the plurality of insertion rods 35 are respectively inserted into the corresponding insertion holes 34, and the number of the insertion rods 35 is at least two, which are distributed on both sides of the adjusting lever 32, thereby providing stability for the connection between the mounting base 11 and the connecting sleeve 23.

[0045] One end of the connecting arm 21 in the embodiment is provided with a support rod 22, and the other end of the support rod 22 is also provided with a support rod 22; the support rod 22 is sleeved with the support rod 22, and the support rod 22 is movably connected with the connecting arm 21.

[0046] The utility model sets up the fixed mechanism 2, and the movable arm 27 is arranged at one end of the connecting arm 21 and is movable relative to the connecting arm 21, that is to say, the utility model has three support rods 22, two positions are fixed, and the other position can be adjusted according to the shape and size of the test piece, so that the test mechanism 1 is stable, and various shapes and sizes of test pieces are also fixed.

[0047] The utility model discloses a testing device for strain gauge, it is including the base 1, the magnetic force seat 24, the micro electric drill 13, the telescopic rod 122, the cylinder 121, the adjusting rod 32, the gear 38, the strain gauge 14 and the data receiving unit 15, the base 1 is provided with the magnetic force seat 24, the magnetic force seat 24 is provided with the micro electric drill 13, the micro electric drill 13 is provided with the telescopic rod 122, the telescopic rod 122 is provided with the cylinder 121, the cylinder 121 is provided with the adjusting rod 32, the adjusting rod 32 is provided with the gear 38, the gear 38 is provided with the strain gauge 14, the strain gauge 14 is provided with the data receiving unit 15.

[0048] The above is according to the ideal embodiment of the utility model for the inspiration, through the above-mentioned explanation content, the relevant personnel can completely change and modify in the range of not deviating from the technical thought of the utility model. The technical scope of the utility model is not limited to the content in the specification, and the technical scope must be determined according to the scope of claims.

Claims

1. A portable residual stress meter comprising: The utility model provides a kind of testing mechanism (1), fixed mechanism (2) and the centring adjusting mechanism (3) connected with the testing mechanism (1) and the fixed mechanism (2), it is characterized by: the testing mechanism (1) includes: mounting seat (11), lower pressing assembly (12) being arranged in the inside of the mounting seat (11), micro electric drill (13) being arranged in the lower end of the lower pressing assembly (12), strain gauge (14) being arranged on test piece, and data analysis unit (15) being electrically connected with the strain gauge (14);Lower pressing assembly (12) moves in vertical direction inside the mounting seat (11); The fixed mechanism (2) includes: connecting arm (21), support rod (22) being arranged at both ends of the connecting arm (21), and connecting sleeve (23) being sleeved on the outside of the connecting arm (21);The lower end of the support rod (22) is provided with a magnetic base (24); The centring adjusting mechanism (3) includes: adjusting hole (31) being opened on the surface of the mounting seat (11), adjusting rod (32) being arranged on the surface of the connecting sleeve (23) and being matched with the adjusting hole (31), and rack (33) being arranged on one side of the connecting arm (21); The adjusting rod (32) is threadedly connected with the adjusting hole (31), and the outer surface of the adjusting rod (32) is rotationally connected with the connecting sleeve (23);One side of the connecting sleeve (23) is provided with a rack groove (36) and a gear groove (37), the rack (33) is movably arranged in the rack groove (33), and an adjusting gear (38) is arranged in the gear groove (37), and the adjusting gear (38) is meshedly connected with the rack (33).

2. A portable residual stress meter according to claim 1, characterized in that: The lower pressing assembly (12) includes: a cylinder (121) arranged inside the mounting seat (11), and a telescopic rod (122) arranged in the cylinder (121);The outer surface of the cylinder (121) has a first support ring (123);The upper end of the telescopic rod (122) is provided with a pressing plate (124), and the lower end of the telescopic rod (122) is connected with the micro electric drill (13);The outer part of the telescopic rod (122) is sleeved with a spring (125), and the two ends of the spring (125) are respectively connected with the pressing plate (124) and the first support ring (123).

3. A portable residual stress meter according to claim 2, characterized in that: The outer surface of the telescopic rod (122) is threadedly connected with the inner side of the cylinder (121), and the outer surface of the cylinder (121) is rotationally connected with the mounting seat (11).

4. A portable residual stress meter according to claim 3, characterized in that: The outer surface of the cylinder (121) is further provided with a second support ring (126), and the outer edge of the second support ring (126) is provided with a plurality of protrusions (127).

5. The portable residual stress meter according to claim 1, characterized by: The connecting arm (21) is provided with a mounting hole (25) penetrating from top to bottom at both ends, and the support rod (22) is inserted into the mounting hole (25);The support rod (22) is a vertically arranged threaded rod, and the outer surface of the support rod (22) is threadedly connected with a height adjusting sleeve (26), and the upper surface of the height adjusting sleeve (26) abuts against the lower surface of the support rod (22).

6. The portable residual stress meter according to claim 1, characterized by: The mounting base (11) is provided with a plurality of insertion holes (34), and the connecting sleeve (23) is provided with a plurality of insertion rods (35) matched with the insertion holes (34), and the insertion rods (35) are respectively inserted into the corresponding insertion holes (34).

7. The portable residual stress meter according to claim 1, characterized by: The depth of the gear groove (37) is less than the thickness of the connecting sleeve (23), and the gear (38) is rotationally connected with the inner wall of the gear groove (37).

8. The portable residual stress meter according to claim 1, characterized by: The outer surface of the gear (38) is provided with a T-shaped or cross-shaped notch.

9. The portable residual stress meter according to claim 1, characterized by: The support rod (22) mounted at one end of the connecting arm (21) is provided with a movable arm (27), and the other end of the movable arm (27) is also provided with a support rod (22).

10. A portable residual stress meter according to claim 9, characterized in that: The movable arm (27) is sleeved on the support rod (22), and the movable arm (27) is movably connected with the connecting arm (21).

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