Dynamic strain gauge

Abstract

The utility model relates to a dynamic strain gauge, and belongs to the field of detection equipment, the dynamic strain gauge comprises a housing, and the bottom ends of the left and right side walls of the housing are provided with concave cavities; the cavity wall, facing the top end of the machine shell, of the concave cavity is parallel to the surface of the bottom end of the machine shell, the bottom end of the concave cavity is communicated with the end face of the bottom end of the machine shell, and an included angle formed between the cavity wall, facing the front end of the machine shell, of the concave cavity and the cavity wall, facing the upper portion, of the concave cavity is an obtuse angle. Supporting legs are arranged in the concave cavities, one ends of the supporting legs are hinged to the interiors of the concave cavities, and the other ends of the supporting legs are free ends; when the supporting legs abut against the cavity wall, facing the front end of the machine shell, of the concave cavity, the supporting legs support the machine shell and enable the end face of the front end of the machine shell to face the inclined upper portion. The dynamic strain gauge has the advantages that a worker can conveniently operate the dynamic strain gauge, and the worker does not need to bend down for a long time when operating the dynamic strain gauge.

Description

Technical Field

[0001] The present application relates to the field of measuring equipment, and in particular to a dynamic strain gauge. Background Art

[0002] The components of the dynamic strain gauge are: bridge, amplifier, phase-sensitive detector, filter, oscillator, and power supply. It is mainly used in experimental stress analysis and dynamic strength research to measure dynamic strain of arbitrary deformation of structures and materials.

[0003] The current dynamic strain gauge is usually placed directly on the workbench during use, and the control area of ​​the dynamic strain gauge is located on the front end of the dynamic strain gauge. At present, the height of most workbenches is generally between 80 cm and 100 cm. Therefore, when the dynamic strain gauge is placed on the workbench, the staff needs to bend down to operate the dynamic strain gauge operation panel, which is inconvenient in actual operation. Utility Model Content

[0004] In order to facilitate the operation of the dynamic strain gauge by the staff and to eliminate the need for the staff to bend over for a long time when operating the dynamic strain gauge, the present application provides a dynamic strain gauge.

[0005] The present application provides a dynamic strain gauge that adopts the following technical solution:

[0006] A dynamic strain gauge comprises a housing, wherein the bottom ends of the side walls on the left and right sides of the housing are both provided with concave cavities;

[0007] The cavity wall of the concave cavity facing the top of the housing is parallel to the bottom surface of the housing, the bottom of the concave cavity is connected to the bottom end surface of the housing, and the angle formed between the cavity wall of the concave cavity facing the front end of the housing and the cavity wall of the concave cavity facing upward is an obtuse angle;

[0008] A support leg is provided inside each of the concave cavities, one end of each of the support legs is hinged inside the concave cavities, and the other end of each of the support legs is a free end;

[0009] When the support leg abuts against the cavity wall of the concave cavity toward the front end of the casing, the support leg supports the casing and makes the front end surface of the casing face obliquely upward.

[0010] By adopting the above technical solution, the casing is supported by the supporting legs so that the front end face of the casing faces obliquely upward. When the staff operates the dynamic strain gauge, they do not need to bend over to operate, thereby reducing the staff's fatigue.

[0011] Optionally, the supporting leg is detachably connected in the cavity.

[0012] By adopting the above technical solution, when the supporting leg is damaged, the supporting leg can be replaced, thereby reducing the maintenance cost of the dynamic strain gauge.

[0013] Optionally, the support leg is connected to the housing via a hinge shaft, the hinge shaft includes an optical axis segment and a threaded segment, the threaded segment is threadedly connected to the housing, and the support leg is rotatably connected to the optical axis segment.

[0014] By adopting the above technical solution, when the supporting leg needs to be replaced, the hinge shaft can be removed from the casing for replacement, thereby reducing maintenance costs.

[0015] Optionally, the length of the supporting legs is adjustable.

[0016] By adopting the above technical solution, the tilt angle of the housing of the dynamic strain gauge can be changed by adjusting the length of the supporting legs, so that the tilt angle of the dynamic strain gauge can be adjusted according to the height of different people.

[0017] Optionally, the support leg includes a fixed sleeve and a movable joint;

[0018] One end of the movable joint extends into the inner hole of the fixed sleeve, and the other end is located outside the fixed sleeve;

[0019] The movable joint can move in the inner hole of the fixed sleeve along the axial direction of the fixed sleeve;

[0020] A plurality of positioning holes are provided on the tube wall of the fixing sleeve at intervals along the axial direction of the fixing sleeve;

[0021] The movable joint is provided with a receiving groove on the side wall of one end of the inner hole of the fixed sleeve, and a locking pin capable of being inserted into the positioning hole is slidably connected in the receiving groove. When the movable joint moves along the axial direction of the fixed sleeve, the locking pins can be aligned with the positioning holes on the fixed sleeve one by one;

[0022] An elastic body is arranged inside the accommodating groove, and when the locking pin is opposite to the positioning hole, the elastic body pushes the locking pin to be inserted into the corresponding positioning hole.

[0023] By adopting the above technical solution, when adjusting the length of the supporting leg, the locking pin is pressed back into the inside of the accommodating groove, and then the movable section is pulled to move the movable section along the axial direction of the fixed sleeve. When the length of the supporting leg is adjusted to the required length, the locking pin is inserted into the corresponding positioning hole under the action of the elastic body, so that the relative position of the fixed sleeve and the movable section can be locked, thereby completing the adjustment of the length of the supporting leg.

[0024] Optionally, a connecting cavity is provided on the bottom end surface of the housing, and the connecting cavity connects the concave cavities on the left and right sides of the housing;

[0025] The supporting legs located in the left and right concave cavities are connected by connecting arms;

[0026] When the supporting leg rotates to abut against the cavity wall of the concave cavity toward the top of the housing, the connecting arm is located in the communicating cavity;

[0027] An elastic clip is arranged in the communicating cavity;

[0028] When the connecting arm is located in the communicating cavity, the elastic clip clamps and fixes the connecting arm.

[0029] By adopting the above technical solution, the elastic clip clamps and fixes the connecting arm, thereby fixing the supporting leg. During the transportation process, the supporting leg is prevented from moving, which makes it inconvenient to carry the dynamic strain gauge.

[0030] Optionally, the elastic clip includes a first elastic clip, a second elastic clip and a connecting plate, the first elastic clip and the second elastic clip are arranged relative to each other at an interval, one end of the first elastic clip and the second elastic clip are connected to the connecting plate, and the distance between the first elastic clip and the second elastic clip gradually increases from the end farthest from the connecting plate to the end close to the connecting plate.

[0031] By adopting the above technical solution, the first elastic clip and the second elastic clip clamp the connecting arm in the middle, so that the connecting arm can be quickly fixed and the connecting arm can be quickly detached from between the first elastic clip and the second elastic clip.

[0032] Optionally, the first elastic clip and the second elastic clip are both provided with an outwardly folded flange at one end away from the connecting piece.

[0033] By adopting the above technical solution, the flanges of the first elastic clip and the second elastic clip form a flared structure. When the connecting arm enters the flared structure, it is convenient for the connecting arm to push the first elastic clip and the second elastic clip to undergo elastic deformation, thereby making it easier for the connecting arm to be inserted between the first elastic clip and the second elastic clip.

[0034] Optionally, a rubber sleeve is provided at the free end of the supporting leg.

[0035] By adopting the above technical solution, the free end of the supporting leg can be protected and the wear of the free end of the supporting leg can be reduced.

[0036] In summary, the present application includes at least one of the following beneficial technical effects:

[0037] 1. The casing is supported by supporting legs so that the front end of the casing faces obliquely upward. When the staff operates the dynamic strain gauge, they do not need to bend over to operate, thus reducing the staff's fatigue;

[0038] 2. By adjusting the length of the supporting legs, the tilt angle of the housing of the dynamic strain gauge can be changed, so that the tilt angle of the dynamic strain gauge can be adjusted according to the height of different people;

[0039] 3. The elastic clip clamps the connecting arm to fix the supporting leg, thereby fixing the supporting leg to prevent the supporting leg from moving during transportation, thereby preventing the dynamic strain gauge from being inconvenient to carry. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is a schematic diagram of the structure of a dynamic strain gauge disclosed in an embodiment of the present application;

[0041] Figure 2 This is a schematic diagram of the structure of the dynamic strain gauge support leg disclosed in the embodiment of the present application supporting the housing;

[0042] Figure 3 is an exploded view of the connection structure between the support leg and the housing of the dynamic strain gauge disclosed in the embodiment of the present application;

[0043] Figure 4 is an exploded view of a support leg used by a dynamic strain gauge disclosed in an embodiment of the present application;

[0044] Figure 5 is a partial cross-sectional view of a support leg used by a dynamic strain gauge disclosed in an embodiment of the present application;

[0045] Figure 6 is a schematic structural diagram of the bottom end surface of the dynamic strain gauge disclosed in the embodiment of the present application;

[0046] Figure 7 yes Figure 6 A partial enlarged view of area A in the middle.

[0047] Explanation of the accompanying drawings: 1. casing; 11. concave cavity; 12. connecting cavity; 2. supporting leg; 21. fixing sleeve; 211. positioning hole; 22. movable joint; 221. accommodating groove; 2211. first groove body; 2212. second groove body; 23. locking pin; 231. rod body; 232. baffle; 24. spring; 3. hinge axis; 31. optical axis section; 32. threaded section; 4. rubber sleeve; 5. connecting arm; 6. elastic clip; 61. first elastic clip; 611. first flange; 62. second elastic clip; 621. second flange; 63. connecting piece. DETAILED DESCRIPTION

[0048] The following is combined with Figure 1-7 This application is described in further detail.

[0049] The embodiment of the present application discloses a dynamic strain gauge.

[0050] Reference Figure 1 , Figure 2 The dynamic strain gauge includes a housing 1 having a rectangular structure. A cavity 11 is provided at the bottom end of the side walls on both sides of the housing 1. The cavity wall of the cavity 11 facing the top end of the housing 1 is parallel to the bottom end face of the housing 1. The bottom end of the cavity 11 is connected to the bottom end face of the housing 1. The angle formed between the cavity wall of the cavity 11 facing the front end of the housing 1 and the cavity wall of the cavity 11 facing the top end of the housing 1 is an obtuse angle.

[0051] Support legs 2 are provided in the concave cavities of the left and right side walls of the casing 1, and one end of the support leg 2 is hinged in the installed concave cavity 11 through a hinge shaft 3. The two hinge shafts 3 are coaxially arranged opposite to each other. The other end of the support leg 2 is a free end. When the support leg 2 rotates counterclockwise around the hinge shaft 3 in the direction of the rear end of the casing 1 and the support leg 2 abuts against the cavity wall of the concave cavity 11 facing the top of the casing 1, the support leg 2 is completely retracted into the concave cavity 11. When the support leg 2 rotates clockwise in the direction of the front end of the casing 1 and abuts against the cavity wall of the concave cavity 11 facing the front end of the casing 1, the free end of the support leg 2 is located below the bottom end face of the casing 1. When the free end of the support leg 2 is located below the bottom end face of the casing 1, when the casing 1 is placed on the table top of the workbench, the casing 1 is tilted under the support of the support leg 2, and the front end face of the casing 1 faces obliquely upward.

[0052] Reference Figure 3 The hinge shaft 3 includes a coaxially arranged smooth optical shaft section 31 and a threaded section 32 with threads on the surface, and the optical shaft section 31 and the threaded section 32 are integrally formed. The threaded section 32 is threadedly connected to the housing 1. The support leg 2 is rotatably connected to the optical shaft section 31. The hinge shaft 3 is threadedly connected to the housing 1, so that when the support leg 2 is damaged, the support leg 2 can be removed from the housing 1 for replacement.

[0053] Reference Figure 4 , Figure 5 The support leg 2 includes a fixed sleeve 21 and a movable joint 22, one end of the movable joint 22 extends into the inner hole of the fixed sleeve 21, and the other end of the movable joint 22 is located outside the fixed sleeve 21. The movable joint 22 can move in the inner hole of the fixed sleeve 21 along the axial direction of the fixed sleeve 21.

[0054] A plurality of positioning holes 211 are formed on the wall of the fixing sleeve 21 at a side of the fixing sleeve 21 facing away from the housing 1 . The positioning holes 211 are arranged at intervals along the axial direction of the fixing sleeve 21 .

[0055] The moving section 22 is located at one end inside the fixed sleeve 21, and a receiving groove 221 is provided on the side wall of the moving section 22 facing away from the housing 1, and a locking pin 23 is slidably connected inside the receiving groove 221. The receiving groove 221 includes a first groove body 2211 and a second groove body 2212, and the second groove body 2212 connects the first groove body 2211 with the outer surface of the moving section 22. The cross-sectional area of ​​the first groove body 2211 is greater than the cross-sectional area of ​​the second groove body 2212.

[0056] The lock pin 23 includes a rod body 231 penetrating the second groove body 2212 and a baffle 232 located at the first groove body 2211. The rod body 231 and the baffle 232 are integrally formed. The cross-sectional shape of the baffle 232 is adapted to the cross-sectional shape of the first groove body 2211, so that the side wall surface of the baffle 232 abuts against the groove body wall of the first groove body 2211. The thickness of the baffle 232 is less than the depth of the first groove body 2211. The length of the rod body 231 is longer than the depth of the second groove body 2212.

[0057] A spring 24 is disposed inside the first slot 2211, one end of the spring 24 abuts against the bottom wall of the first slot 2211, and the other end of the spring 24 abuts against the baffle 232. When the baffle 232 compresses the spring 24, the rod 231 can be retracted into the second slot 2212. When the spring 24 is in an uncompressed state, one end of the rod 231 away from the baffle 232 extends out of the surface of the moving joint 22.

[0058] One end of the rod body 231 away from the baffle 232 can be inserted into the interior of the positioning hole 211. When the movable section 22 moves along the axial direction of the fixed sleeve 21, the locking pin 23 can be opposite to the positioning holes 211 on the fixed sleeve 21 one by one. When the locking pin 23 is opposite to one of the positioning holes 211, the rod body 231 of the locking pin 23 is inserted into the corresponding positioning hole 211, locking the relative position of the fixed sleeve 21 and the movable section 22, and locking the length of the support leg 2. When it is necessary to adjust the length of the support leg 2, the locking pin 23 is pressed back into the second slot 2212. At this time, the spring 24 is in a compressed state, and the movable section 22 is pulled along the axial direction of the fixed sleeve 21, so that the locking pin 23 moves to be opposite to one of the other positioning holes 211. When the locking pin 23 is opposite to the positioning hole 211 , the spring 24 pushes the locking pin 23 to move toward the positioning hole 211 , and the locking pin 23 is inserted into the positioning hole 211 , so that the length of the supporting leg 2 can be adjusted.

[0059] In order to protect the free end of the supporting leg 2 , a rubber sleeve 4 is sleeved on the outside of the free end of the supporting leg 2 , and the rubber sleeve 4 wraps the free end of the supporting leg 2 , thereby reducing the wear of the supporting leg 2 .

[0060] Reference Figure 6A communication cavity 12 is provided on the bottom end surface of the casing 1 , and the communication cavity 12 is connected to the concave cavities 11 on the left and right sides of the casing 1 .

[0061] A connecting arm 5 is provided between the two supporting legs 2. The connecting arm 5 is a cylindrical structure. One end of the connecting arm 5 is fixedly connected to the free end of one of the supporting legs 2, and the other end of the connecting arm 5 is fixedly connected to the free end of the other supporting leg 2. When the supporting leg 2 rotates counterclockwise toward the rear end of the housing 1, and the supporting leg 2 abuts against the cavity wall of the concave cavity 11 toward the top of the housing 1, the connecting arm 5 is located inside the communicating cavity 12.

[0062] Reference Figure 6 , Figure 7 An elastic clip 6 is fixed inside the connecting cavity 12. The elastic clip 6 includes a first elastic clip 61, a second elastic clip 62, and a connecting piece 63 located between the first elastic clip 61 and the second elastic clip 62. The first elastic clip 61, the connecting piece 63, and the second elastic clip 62 are integrally formed. The first elastic clip 61 and the second elastic clip 62 are arranged relative to each other at a distance. One end of the first elastic clip 61 is connected to the connecting piece 63, and the other end of the first elastic clip 61 is a free end. One end of the second elastic clip 62 is connected to the connecting piece 63, and the other end of the second elastic clip 62 is a free end. The connecting piece 63 is attached to the cavity bottom of the connecting cavity 12 and fixed to the cavity bottom of the connecting cavity 12. A distance is left between the first elastic clip 61 and the second elastic clip 62 and the cavity wall of the connecting cavity 12, and the left distance is used to deform the first elastic clip 61 and the second elastic clip 62.

[0063] The distance between the first elastic clip 61 and the second elastic clip 62 gradually increases from the end away from the connecting piece 63 to the end close to the connecting piece 63. The maximum distance between the first elastic clip 61 and the second elastic clip 62 enables the connecting arm 5 to be inserted between the first elastic clip 61 and the second elastic clip 62. The minimum distance between the first elastic clip 61 and the second elastic clip 62 is smaller than the diameter of the connecting arm 5. When the free ends of the first elastic clip 61 and the second elastic clip 62 are away from each other, the distance between the free ends of the first elastic clip 61 and the second elastic clip 62 enables the connecting arm 5 to pass through.

[0064] In order to facilitate the connection arm 5 to be inserted between the first elastic clip 61 and the second elastic clip 62, the free end of the first elastic clip 61 is provided with a first flange 611 folded outwards, and the first flange 611 is integrally formed with the first elastic clip 61. The free end of the second elastic clip 62 is provided with a second flange 621 folded outwards, and the second flange 621 is integrally formed with the second elastic clip 62.

[0065] When the connecting arm 5 is inserted between the first elastic clip 61 and the second elastic clip 62, the connecting arm 5 first pushes the free ends of the first elastic clip 61 and the second elastic clip 62, so that the free ends of the first elastic clip 61 and the second elastic clip 62 gradually move away from each other, until the connecting arm 5 is completely inserted between the first elastic clip 61 and the second elastic clip 62. At this time, the first elastic clip 61 and the second elastic clip 62 squeeze the connecting arm 5, thereby fixing the connecting arm 5.

[0066] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "front", "back" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0067] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection, a mechanical connection, an electrical connection, a direct connection, or an indirect connection through an intermediate medium, or the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present application can be understood according to the specific circumstances. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0068] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A dynamic strain gauge, comprising a housing (1), characterized in that: The bottom ends of the side walls on both sides of the housing (1) are both provided with concave cavities (11); The cavity wall of the concave cavity (11) facing the top end of the housing (1) is parallel to the bottom end surface of the housing (1), the bottom end of the concave cavity (11) is connected to the bottom end surface of the housing (1), and the angle formed between the cavity wall of the concave cavity (11) facing the front end of the housing (1) and the cavity wall of the concave cavity (11) facing upward is an obtuse angle; A support leg (2) is provided inside the concave cavity (11), one end of the support leg (2) is hinged inside the concave cavity (11), and the other end of the support leg (2) is a free end; When the support leg (2) abuts against the cavity wall of the concave cavity (11) toward the front end of the casing (1), the support leg (2) supports the casing (1) and makes the front end face of the casing (1) face obliquely upward.

2. A dynamic strain gauge according to claim 1, characterized in that: The supporting leg (2) is detachably connected in the concave cavity (11).

3. A dynamic strain gauge according to claim 2, characterized in that: The support leg (2) is connected to the housing (1) via a hinge shaft (3); the hinge shaft (3) comprises an optical axis section (31) and a threaded section (32); the threaded section (32) is threadedly connected to the housing (1); and the support leg (2) is rotatably connected to the optical axis section (31).

4. A dynamic strain gauge according to claim 1, characterized in that: The length of the supporting leg (2) is adjustable.

5. A dynamic strain gauge according to claim 4, characterized in that: The supporting leg (2) comprises a fixed sleeve (21) and a movable joint (22); One end of the movable joint (22) extends into the inner hole of the fixed sleeve (21), and the other end is located outside the fixed sleeve (21); The movable joint (22) is capable of moving in the inner hole of the fixed sleeve (21) along the axial direction of the fixed sleeve (21); A plurality of positioning holes (211) are provided on the tube wall of the fixing sleeve (21) at intervals along the axial direction of the fixing sleeve (21); The movable section (22) is provided with a receiving groove (221) on a side wall at one end of the inner hole of the fixed sleeve (21), and a locking pin (23) capable of being inserted into the positioning hole (211) is slidably connected in the receiving groove (221); when the movable section (22) moves along the axial direction of the fixed sleeve (21), the locking pin (23) can be aligned with the positioning holes (211) on the fixed sleeve (21) one by one; An elastic body is disposed inside the receiving groove (221), and when the locking pin (23) is opposite to the positioning hole (211), the elastic body pushes the locking pin (23) to be inserted into the corresponding positioning hole (211).

6. A dynamic strain gauge according to claim 1, characterized in that: The bottom end surface of the housing (1) is provided with a connecting cavity (12), and the connecting cavity (12) connects the concave cavities (11) on the left and right sides of the housing (1); The support legs (2) located in the left and right concave cavities (11) are connected via a connecting arm (5); When the support leg (2) rotates to abut against the cavity wall of the concave cavity (11) facing the top of the housing (1), the connecting arm (5) is located in the connecting cavity (12); An elastic clip (6) is arranged in the communicating cavity (12); When the connecting arm (5) is located in the communicating cavity (12), the elastic clip (6) clamps and fixes the connecting arm (5).

7. A dynamic strain gauge according to claim 6, characterized in that: The elastic clip (6) comprises a first elastic clip (61), a second elastic clip (62) and a connecting piece (63); the first elastic clip (61) and the second elastic clip (62) are arranged opposite to each other at a distance; one end of the first elastic clip (61) and the second elastic clip (62) are connected to the connecting piece (63); and the distance between the first elastic clip (61) and the second elastic clip (62) gradually increases from the end away from the connecting piece (63) to the end close to the connecting piece (63).

8. A dynamic strain gauge according to claim 7, characterized in that: The first elastic clip (61) and the second elastic clip (62) are both provided with outwardly folded edges at one end away from the connecting piece (63).

9. A dynamic strain gauge according to claim 1, characterized in that: The free end of the supporting leg (2) is provided with a rubber sleeve (4).

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