Foil strain gauge resistance value automatic testing device

Abstract

The utility model relates to a foil type strain gauge resistance value automatic testing device comprising a rack which is provided with an installation disc which is arranged on the rack and is used for placing a plurality of foil type strain gauges; the mounting disc driving mechanism can drive the mounting disc to move forwards, backwards, leftwards and rightwards; the foil type strain gauge connecting device is arranged on the rack, and the foil type strain gauge connecting device comprises a pair of contact pins; the foil type strain gauge connecting device driving device can drive the foil type strain gauge connecting device to move to the position above the mounting disc and drive the contact pins of the foil type strain gauge connecting device to move downwards so as to make contact with the contacts of the corresponding foil type strain gauges; the resistance measuring instrument is connected to the contact pins and is used for acquiring the resistance of the corresponding foil strain gauges; and the control system is used for controlling the operation of each component and recording an acquisition result of the resistance measuring instrument.

Description

Technical Field

[0001] The utility model relates to the field of strain gauge production testing, in particular to an automatic resistance value testing device for foil type strain gauges. Background Art

[0002] Strain gauges are sensors whose resistance changes with applied force; they measure physical quantities such as force, pressure, tension, weight, etc. by converting them into changes in resistance. When an external force acts on a fixed object, stress and strain are generated. The reaction force generated inside the object (to the external force) is stress, and the displacement and deformation generated are strain. Strain gauges are one of the most important sensors in electrical measurement technology and are used to measure mechanical quantities. As the name suggests, strain gauges are mainly used for strain measurement. As a technical term, "strain" includes tensile strain and compressive strain, which are distinguished by positive and negative signs. Therefore, strain gauges can measure both expansion and contraction.

[0003] During the use of strain gauges, several strain gauges are used to form a Wheatstone bridge circuit. When there is no force or deformation, the closer the resistance values ​​of the strain gauges forming the Wheatstone bridge circuit are, the more accurate their response to external forces will be. During the production of strain gauges, it is necessary to measure the resistance of the strain gauges so that strain gauges with similar resistance values ​​can be sorted. The existing strain gauge resistance measurement process is often performed manually due to its small area and small solder joints, and it still cannot be automated.

[0004] The purpose of the present invention is to design an automatic resistance test device for foil strain gauges in view of the above-mentioned problems in the prior art. Utility Model Content

[0005] In view of the problems existing in the above-mentioned prior art, the utility model provides an automatic resistance value testing device for foil strain gauges, which can effectively solve at least one problem existing in the above-mentioned prior art.

[0006] The technical solution of the utility model is:

[0007] A foil strain gauge resistance automatic testing device comprises a frame, wherein the frame is provided with:

[0008] A mounting plate for placing several foil strain gauges;

[0009] The installation disk driving mechanism can drive the installation disk to move forward, backward, left and right;

[0010] A foil strain gauge connection device, the foil strain gauge connection device comprising a pair of contact pins;

[0011] A foil strain gauge connection device driving device, which can drive the foil strain gauge connection device to move above the mounting plate, and drive the contact pins of the foil strain gauge connection device to move downward so as to contact the contacts of the corresponding foil strain gauges;

[0012] a resistance measuring instrument, connected to the contact pins, for collecting the resistance of the corresponding foil strain gauge;

[0013] The control system is used to control the operation of each component and record the collection results of the resistance measuring instrument.

[0014] Further, the foil strain gauge connection device driving device comprises a first screw rod arranged transversely, the first screw rod drives a connection seat, and a first driving cylinder arranged downward;

[0015] The foil strain gauge connection device comprises a mounting plate, the middle portion of which is hinged to the connection seat, and the first driving cylinder drives the mounting plate to swing at its hinged end, thereby driving the contact pin to move up and down.

[0016] Furthermore, a spring is connected between the connecting seat and the mounting plate.

[0017] Furthermore, the mounting plate driving mechanism comprises a second screw rod arranged transversely and a third screw rod arranged longitudinally, the second screw rod is used to drive the mounting plate to move left and right, and the third screw rod is used to drive the mounting plate to move forward and backward.

[0018] Furthermore, the bottom of the mounting plate is a cylindrical structure, and a gear ring is provided on the outer side of the bottom of the mounting plate, and the gear ring enables the mounting plate to rotate through the cooperation of a corresponding motor and a belt.

[0019] Furthermore, it includes a camera, which is arranged in the frame at a position above the mounting plate. The control system is used to obtain the image of the foil strain gauge through the camera and control the angle of the mounting plate through the motor.

[0020] Furthermore, it comprises a supplementary light source, which is arranged above the installation plate.

[0021] Furthermore, it includes a friction mechanism, which is arranged at a position where the frame is located on the side of the mounting plate, and the foil strain gauge connection device driving device can drive the foil strain gauge connection device to move to the top of the friction mechanism, so that the contact pin rubs against the friction mechanism.

[0022] Furthermore, the friction mechanism includes a fine friction plate and a coarse friction plate, and the fine friction plate and the coarse friction plate are driven by corresponding second drive cylinders so as to be movable left and right, so that the contact pin rubs against the corresponding fine friction plate or the coarse friction plate.

[0023] Furthermore, the friction mechanism includes a fourth screw rod, which is longitudinally arranged to drive the fine friction plate and the coarse friction plate to move forward and backward. The cooperation between the second drive cylinder and the fourth screw rod enables the contact pin to rub in the un-friction area of ​​the fine friction plate or the coarse friction plate.

[0024] Therefore, the utility model provides the following effects and / or advantages:

[0025] The utility model can realize automatic measurement of the resistance of a plurality of foil strain gauges, replace manual work, and realize automatic measurement.

[0026] The utility model can realize the measurement of each foil strain gauge through the arrangement of the mounting plate and the mounting plate driving mechanism and the cooperation with the contact pins, and can also adjust the arrangement angle of the strain gauge.

[0027] The utility model can grind and clean the contact pins through the cooperation of the friction mechanism, thereby ensuring the sensitivity of the contact pins during long-term trials.

[0028] It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of the placement of foil strain gauges.

[0030] Figure 2 It is a structural schematic diagram of the utility model.

[0031] Figure 3 It is a structural schematic diagram of a foil strain gauge connecting device and a foil strain gauge connecting device driving device.

[0032] Figure 4 It is a structural diagram of the friction mechanism. DETAILED DESCRIPTION

[0033] In order to facilitate understanding by those skilled in the art, the structure of the present invention is further described in detail with reference to the accompanying drawings:

[0034] Embodiment 1

[0035] refer to Figure 2-4 , a foil strain gauge resistance automatic testing device, comprising a frame 1, wherein the frame 1 is provided with:

[0036] A mounting plate 2 for placing a plurality of foil strain gauges 10;

[0037] The mounting plate driving mechanism 3 can drive the mounting plate 2 to move forward, backward, left and right;

[0038] The foil strain gauge connection device 4 comprises a pair of contact pins 401;

[0039] The foil strain gauge connection device driving device 5 can drive the foil strain gauge connection device 4 to move above the mounting plate 2, and drive the contact pin 401 of the foil strain gauge connection device 4 to move downward so as to contact the contact point of the corresponding foil strain gauge 10;

[0040] a resistance measuring instrument 6 connected to the contact pin 401 and used for collecting the resistance of the corresponding foil strain gauge 10;

[0041] The control system (not shown) is used to control the operation of each component and record the collection results of the resistance measuring instrument 5.

[0042] In this embodiment, the foil strain gauge 10 is formed into a Figure 1 The shape of the array arrangement is shown. The foil strain gauges 10 arranged in the array are bonded by an adhesive film 20 so that they can be arranged regularly. Then the film 20 is opened by a fixing frame 30 to facilitate subsequent testing.

[0043] The mounting disk 2 in this embodiment is a shape that matches the above-mentioned fixing frame 30 and membrane 20, and is not limited here. The fixing frame 30 can be locked by the mounting disk 2 so that it moves with the mounting disk 2. The foil strain gauge connection device driving device 4 drives the foil strain gauge connection device 3 to the top of the mounting disk 2, at which time the position of the foil strain gauge connection device 3 is fixed. Then, the mounting disk 2 can move forward, backward, left and right, so that each foil strain gauge 10 arranged in the array is moved to the bottom of the contact pin 301 in turn. Then, the foil strain gauge connection device 3 drives the contact pin 301 to move downward, thereby contacting the corresponding foil strain gauge 10, so that the resistance of each foil strain gauge 10 can be automatically measured. The resistance measuring instrument 5 can be a direct adoption of the existing technology, such as a multimeter.

[0044] refer to Figure 3 , further, the foil strain gauge connection device driving device 5 comprises a first screw rod 501 arranged transversely, the first screw rod 501 drives a connection seat 502, and a first driving cylinder 503 arranged downward;

[0045] The foil strain gauge connection device 4 includes a mounting plate 401 , the middle portion of which is hinged to the connection seat 502 , and the first drive cylinder 503 drives the mounting plate 401 to swing at its hinged end, thereby driving the contact pin 402 to move up and down.

[0046] The middle part of the mounting plate 401 is hinged to the connecting seat 502 to form a seesaw-like structure. One end of the mounting plate 401 is driven by the first driving cylinder 503, and the other end of the mounting plate 401 can swing up and down.

[0047] Furthermore, a spring is connected between the connecting seat 502 and the mounting plate 401 .

[0048] In this embodiment, the spring can enable the connecting seat 502 and the mounting plate 401 to form a clip-like structure, thereby cooperating with the first driving cylinder 503 to achieve the reset of the mounting plate 401.

[0049] Furthermore, the mounting plate driving mechanism 3 includes a second screw rod 301 arranged transversely and a third screw rod 302 arranged longitudinally, wherein the second screw rod 301 is used to drive the mounting plate 2 to move left and right, and the third screw rod 302 is used to drive the mounting plate 3 to move forward and backward.

[0050] Furthermore, the bottom of the mounting plate 2 is a cylindrical structure, and a gear ring 201 is provided on the outer side of the bottom of the mounting plate 2. The gear ring 201 enables the mounting plate 2 to rotate through the cooperation of a corresponding motor and a belt.

[0051] Furthermore, it includes a camera 7, which is arranged in the frame 1 at a position above the mounting plate 2, and the control system is used to obtain the image of the foil strain gauge 10 through the camera 7 and control the angle of the mounting plate 2 through the motor.

[0052] Furthermore, it includes a supplementary light source 8 which is arranged above the mounting plate 2 .

[0053] In this embodiment, the camera 7 can obtain the image of the foil strain gauge 10 from directly above the mounting disk 2, so as to automatically determine the arrangement direction of the image of the foil strain gauge 10, and the mounting disk 2 is rotated by rotating the motor so that the lateral arrangement direction of the foil strain gauge 10 is parallel to the second screw rod 301, and the longitudinal arrangement direction of the foil strain gauge 10 is parallel to the third screw rod 302, so that the second screw rod 301 and the third screw rod 302 can be used to control the position of the mounting disk 2.

[0054] Further, refer to Figure 4, including a friction mechanism 9, which is arranged at a position where the frame 1 is located on the side of the mounting plate 2, and the foil strain gauge connection device driving device 5 can drive the foil strain gauge connection device 4 to move to the top of the friction mechanism 9, so that the contact pin 401 rubs against the friction mechanism 9.

[0055] Furthermore, the friction mechanism 9 includes a fine friction plate 901 and a coarse friction plate 902, and the fine friction plate 901 and the coarse friction plate 902 are driven by the corresponding second driving cylinder 903 so as to be movable left and right, so that the contact pin 401 rubs against the corresponding fine friction plate 901 or the coarse friction plate 902.

[0056] When the contact pin 401 is close to the fine friction plate 901 or the coarse friction plate 902, the second drive cylinder 903 moves it left and right, so as to rub the contact pin 401. This is because during the production process of the foil strain gauge 10, the solder joints are coated with a film, and the surface may be covered with wax, detergent, etc. After the contact pin 401 contacts the solder joints for many times, it will be contaminated, thereby reducing its performance. Therefore, the contact pin 401 can be rubbed by the corresponding friction plate to keep it clean.

[0057] Furthermore, the friction mechanism includes a fourth screw rod 904, which is longitudinally arranged to drive the fine friction plate 901 and the coarse friction plate 902 to move forward and backward. The cooperation between the second drive cylinder 903 and the fourth screw rod 904 enables the contact pin 401 to rub in the un-friction area of ​​the fine friction plate 901 or the coarse friction plate 902.

[0058] In this embodiment, the cooperation of the second drive cylinder 903 and the fourth screw rod 904 enables the fine friction plate 901 or the coarse friction plate 902 to move in the front, back, left, and right directions, thereby controlling the position of the fine friction plate 901 or the coarse friction plate 902. After the contact pin 401 rubs against the fine friction plate 901 or the coarse friction plate 902, the friction area will be contaminated or the friction coefficient will be reduced. Through the cooperation and movement of the second drive cylinder 903 and the fourth screw rod 904, the contact pin 401 rubs against various positions of the fine friction plate 901 or the coarse friction plate 902. The coarse friction plate 902 can be sandpaper with a mesh size of less than 400, and the fine friction plate 901 can be sandpaper with a mesh size of more than 400, which is not limited here.

[0059] It should be noted that in the claims, any reference signs placed between brackets shall not be constructed as limiting the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claims. The word "a" or "an" preceding a component does not exclude the presence of a plurality of such components. The utility model can be implemented with the aid of hardware comprising several different components and with the aid of a suitably programmed computer. In a unit claim enumerating several means, several of these means may be embodied by the same hardware item. The use of the words first, second, and third etc. does not indicate any order. These words may be interpreted as names.

[0060] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present invention.

[0061] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0062] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms should not be understood as necessarily being directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

Claims

1. An automatic resistance test device for foil strain gauges, characterized in that: The invention comprises a frame, wherein the frame is provided with: A mounting plate for placing several foil strain gauges; The installation disk driving mechanism can drive the installation disk to move forward, backward, left and right; A foil strain gauge connection device, the foil strain gauge connection device comprising a pair of contact pins; A foil strain gauge connection device driving device, which can drive the foil strain gauge connection device to move above the mounting plate, and drive the contact pins of the foil strain gauge connection device to move downward so as to contact the contacts of the corresponding foil strain gauges; a resistance measuring instrument, connected to the contact pins, for collecting the resistance of the corresponding foil strain gauge; The control system is used to control the operation of each component and record the collection results of the resistance measuring instrument.

2. The automatic resistance test device of a foil strain gauge according to claim 1, characterized in that: The foil strain gauge connection device driving device comprises a first screw rod arranged transversely, the first screw rod drives a connection seat, and a first driving cylinder arranged downwardly; The foil strain gauge connection device comprises a mounting plate, the middle portion of which is hinged to the connection seat, and the first driving cylinder drives the mounting plate to swing at its hinged end, thereby driving the contact pin to move up and down.

3. The automatic resistance test device of a foil strain gauge according to claim 2, characterized in that: A spring is connected between the connecting seat and the mounting plate.

4. The automatic resistance test device of a foil strain gauge according to claim 1, characterized in that: The mounting plate driving mechanism comprises a second screw rod arranged transversely and a third screw rod arranged longitudinally, wherein the second screw rod is used to drive the mounting plate to move left and right, and the third screw rod is used to drive the mounting plate to move forward and backward.

5. The automatic resistance test device of a foil strain gauge according to claim 1, characterized in that: The bottom of the mounting plate is a cylindrical structure, and a gear ring is arranged on the outer side of the bottom of the mounting plate. The gear ring enables the mounting plate to rotate through the cooperation of a corresponding motor and a belt.

6. The automatic resistance test device of a foil strain gauge according to claim 5, characterized in that: It includes a camera, which is arranged in the frame at a position above the mounting plate. The control system is used to obtain the image of the foil strain gauge through the camera and control the angle of the mounting plate through the motor.

7. The automatic resistance test device of a foil strain gauge according to claim 6, characterized in that: It includes a supplementary light source, which is arranged above the installation plate.

8. The automatic resistance test device of a foil strain gauge according to claim 1, characterized in that: It includes a friction mechanism, which is arranged at a position where the frame is located on the side of the mounting plate. The foil strain gauge connecting device driving device can drive the foil strain gauge connecting device to move above the friction mechanism, so that the contact pin rubs against the friction mechanism.

9. The automatic resistance test device of a foil strain gauge according to claim 8, characterized in that: The friction mechanism comprises a fine friction plate and a coarse friction plate, and the fine friction plate and the coarse friction plate are driven by corresponding second driving cylinders so as to be movable left and right, so that the contact pin rubs against the corresponding fine friction plate or the coarse friction plate.

10. The automatic resistance test device of a foil strain gauge according to claim 9, characterized in that: The friction mechanism includes a fourth screw rod, which is longitudinally arranged to drive the fine friction plate and the coarse friction plate to move forward and backward. The cooperation between the second drive cylinder and the fourth screw rod enables the contact pin to rub the un-friction area of ​​the fine friction plate or the coarse friction plate.

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