CN108673375A - Clamping device for pasting strain gauges on strain beams of beam structures - Google Patents

Abstract

A clamping device for pasting strain gauges on beam structure strain beams relates to a clamping device for pasting strain gauges. The clamping device solves the problems that the clamping force of the clamping device pasted by the existing beam-type structure strain gauge is difficult to control, the distribution of the clamping force applied to the strain gauge is concentrated, and the parallel clamp structure with the uniformly distributed clamping force is complex and large in size. The clamping device comprises two clamping plates which are oppositely arranged and two bolt assemblies; the distance between the two oppositely arranged clamping plates can be adjusted by the two bolt assemblies, and the clamping parts of the two oppositely arranged clamping plates are used for clamping the strain gauge on the strain beam with the beam structure. The invention can be widely applied to the clamping of beam type strain gage pasting and the clamping of various workpieces with limited clamping space.

Description

Clamping device for pasting strain gauges on strain beams of beam structures

technical field

The invention relates to a clamping device for sticking strain gauges.

Background technique

The joints of the manipulator are usually pasted with strain gauges to detect the joint torque, and the quality of the strain gauge paste directly affects the accuracy of the joints of the manipulator. Press or clamp with clips, but often face the following problems: In some places with limited space, such as beam structure strain gauges pasted, the force that can be exerted by clips is limited, it is more difficult to reach by hand, and the clamping force is difficult to control. The distribution of the clamping force on the strain gauge is relatively concentrated. The use of parallel clamps can ensure that the clamping force on the strain gauge is evenly distributed, but the parallel clamps are often complex in structure, large in size, and inconvenient to use.

Contents of the invention

The present invention aims to solve the problem that the clamping force of the clamping device attached to the existing beam structure strain gauge is difficult to control, the clamping force distribution of the strain gauge is relatively concentrated, and the parallel clamp structure with a uniform distribution of clamping force is complex and bulky. , The invention provides a clamping device for pasting the strain gage on the strain beam of the beam structure.

A clamping device for pasting strain gauges on a strain beam of a beam structure, including two opposite clamping plates 1 and two bolt assemblies 2;

The two bolt assemblies 2 can adjust the distance between the two opposite clamping plates 1, and the clamping parts 1-1 of the two opposite clamping plates 1 are used to clamp the strain on the strain beam 3 of the beam structure piece.

Preferably, each bolt assembly 2 includes a bolt rod 2-1, a large nut 2-2 and a small nut 2-3;

The bolt rod 2-1 includes two threaded sections 2-1-1, and the optical axis section 2-1-2 is between the two threaded sections 2-1-1;

Both bolt assemblies 2 run through two opposite clamping plates 1, wherein the first clamping plate 1 is fastened between the screw head of the first bolt rod 2-1 and the large nut 2-2 on it, A second clamping plate 1 is fastened between the screw head of the second bolt rod 2-1 and the large nut 2-2 on it;

A spring 4 is squeezed between the small nut 2-3 that is threaded at the end of the first bolt rod 2-1 and the second clamping plate 1;

A spring 4 is squeezed between the small nut 2-3 that is threaded on the tail of the second bolt rod 2-1 and the first clamping plate 1;

The optical axis section 2-1-2 on the first bolt rod 2-1 can move left and right relative to the second clamping plate 1;

The optical axis section 2-1-2 on the second bolt rod 2-1 can move left and right relative to the first clamping plate 1.

Preferably, the clamping part 1-1 is a rectangular plate structure.

Preferably, a detachable pressing plate 5 is installed at the tail of each bolt rod 2-1.

Preferably, a depression is provided on the pressing surface of the detachable pressing board 5 , and the depression is used to hold fingers.

Preferably, the clamping plate 1 is made of steel.

Preferably, a rubber pad is provided on the inner side of the clamping part 1-1.

The beneficial effect brought by the invention is that the invention can realize the function of parallel clamping, so that the force on the clamped workpiece is uniform. It has the function of adjustable clamping force, which is convenient to adjust. It has a long service life and can be restored to its original state only by replacing the spring. Small in size and light in weight, the clamping force can still be guaranteed in a limited space, and can be widely used in the clamping of beam-type strain gauges and various workpieces with limited clamping space.

Description of drawings

Fig. 1 is the structural representation of the clamping device for pasting the strain gauge on the beam structure strain beam according to the present invention;

Fig. 2 is a state diagram when the tails of the two bolt rods 2-1 in Fig. 1 are squeezed;

Fig. 3 is a state diagram when increasing the clamping force of the clamping plate 1 in Fig. 1;

Fig. 4 is a schematic structural diagram of the bolt rod 2-1.

Detailed ways

Specific Embodiment 1: Refer to FIG. 1 to illustrate this embodiment. The clamping device for pasting the strain gage on the strain beam of the beam structure described in this embodiment includes two oppositely arranged clamping plates 1 and two bolt assemblies 2 ;

The two bolt assemblies 2 can adjust the distance between the two opposite clamping plates 1, and the clamping parts 1-1 of the two opposite clamping plates 1 are used to clamp the strain on the strain beam 3 of the beam structure piece.

In this embodiment, the present invention can realize the function of parallel clamping, so that the force on the clamped workpiece is uniform.

Specific embodiment two: Refer to Fig. 1 to Fig. 4 to illustrate this embodiment, the difference between this embodiment and the clamping device for pasting the strain gages on the strain beam of the beam structure described in the first embodiment is that each of the The bolt assembly 2 includes a bolt rod 2-1, a large nut 2-2 and a small nut 2-3;

The bolt rod 2-1 includes two threaded sections 2-1-1, and the optical axis section 2-1-2 is between the two threaded sections 2-1-1;

Both bolt assemblies 2 run through two opposite clamping plates 1, wherein the first clamping plate 1 is fastened between the screw head of the first bolt rod 2-1 and the large nut 2-2 on it, A second clamping plate 1 is fastened between the screw head of the second bolt rod 2-1 and the large nut 2-2 on it;

A spring 4 is squeezed between the small nut 2-3 that is threaded at the end of the first bolt rod 2-1 and the second clamping plate 1;

A spring 4 is squeezed between the small nut 2-3 that is threaded on the tail of the second bolt rod 2-1 and the first clamping plate 1;

The optical axis section 2-1-2 on the first bolt rod 2-1 can move left and right relative to the second clamping plate 1;

The optical axis section 2-1-2 on the second bolt rod 2-1 can move left and right relative to the first clamping plate 1.

In this embodiment, in the process of use, the tails of the two bolt rods 2-1 are pressed by hand. After the two clamping plates 1 are separated from each other, the clamping device is inserted into the strain beam of the workpiece. Due to the elastic force of the spring 4, the two clamping plates 1 will approach each other and clamp the strain gauge.

The gap between the optical axis section 2-1-2 of the two bolt rods 2-1 and the through hole on the clamping plate 1 plays the role of a guide rail, so that the bolt rod 2-1 of the clamping device can only move along the axis. There will be no rotation or movement in other directions.

The clamping plate 1 and the bolt rod 2-1 are relatively fixed by the bolts of the large thread section corresponding to the large nut 2-2, but they are not directly made into a whole, which is convenient for processing and saves materials.

By adjusting the positions of the two small nuts 2-3 or replacing the spring 4 with different wire diameters, the spring 4 can generate different elastic forces to meet the needs of different occasions.

The clamping device of the present invention has the function of adjustable clamping force, which is convenient to adjust. The service life is long, and only the spring 4 needs to be replaced to return to the original state. Small in size and light in weight, the clamping force can still be guaranteed in a limited space.

In this embodiment, the thread diameter of the thread segment 2-1-1 corresponding to the large nut 2-2 is larger than the thread diameter of the thread segment 2-1-1 corresponding to the small nut 2-3.

Specific embodiment three: referring to Fig. 1 to Fig. 4 to illustrate this embodiment, the difference between this embodiment and the clamping device for pasting strain gages on beam-type strain beams described in specific embodiment one or two is that the The clamping part 1-1 is a rectangular plate structure.

Specific Embodiment 4: Refer to Fig. 1 to Fig. 4 to illustrate this embodiment. The difference between this embodiment and the clamping device for sticking the strain gage on the beam structure strain beam described in the second embodiment is that each bolt rod The afterbody of 2-1 is equipped with detachable press plate 5.

In this embodiment, the rear portion of each bolt rod 2-1 is equipped with a detachable pressing plate 5, which increases the stress area of the fingers and facilitates extrusion of the rear portion of the bolt rod 2-1.

Embodiment 5: Refer to Fig. 1 to Fig. 4 to illustrate this embodiment. The difference between this embodiment and the clamping device for sticking strain gages on beam-type strain beams described in Embodiment 4 is that the pressing plate can be detached The pressing surface of 5 is provided with a concave portion, and the concave portion is used to hold fingers.

In this embodiment, the arrangement of the recessed portion prevents the finger from slipping off the pressing plate 5, and limits the position of the finger, which is convenient for squeezing the tails of the two bolt rods 2-1.

Specific embodiment six: Referring to Fig. 1 to Fig. 4 to illustrate this embodiment, the difference between this embodiment and the clamping device for pasting the strain gage on the beam structure strain beam described in the specific embodiment one is that the clamping Plate 1 is made of steel.

In this embodiment, the clamping plate 1 is made of steel to ensure high extrusion strength.

Embodiment 7: Refer to Fig. 1 to Fig. 4 to illustrate this embodiment. The difference between this embodiment and the clamping device for sticking strain gages on beam-type strain beams described in Embodiment 1 is that the clamping A rubber pad is provided on the inner side of the part 1-1.

In this embodiment, the rubber pad plays the role of protecting the strain gauge and making the stress distribution more uniform.

The structure of the clamping device for pasting the strain gages on the strain beams of the beam structure according to the present invention is not limited to the specific structures described in the above-mentioned embodiments, but can also be a reasonable combination of the technical features described in the above-mentioned embodiments.

Claims (7)

1. The clamping device for pasting the strain gages on the strain beam of the beam structure is characterized in that, it comprises two opposite clamping plates (1) and two bolt assemblies (2); The two bolt assemblies (2) can adjust the distance between the two opposite clamping plates (1), and the clamping parts (1-1) of the two opposite clamping plates (1) are used to clamp the beam Strain gauges on the type structural strain beam (3). 2. The clamping device for pasting the strain gauges on the beam structure strain beam according to claim 1, characterized in that, each bolt assembly (2) comprises a bolt rod (2-1), a large Nut (2-2) and a small nut (2-3); The bolt rod (2-1) includes two threaded sections (2-1-1), and the optical axis section (2-1-2) is between the two threaded sections (2-1-1); Both bolt assemblies (2) run through two opposite clamping plates (1), wherein the screw head of the first bolt rod (2-1) and the large nut (2-2) on it are fastened with a The first clamping plate (1), the second clamping plate (1) is fastened between the screw head of the second bolt rod (2-1) and the large nut (2-2) thereon; A spring (4) is squeezed between the small nut (2-3) that is threaded at the tail of the first bolt rod (2-1) and the second clamping plate (1); A spring (4) is squeezed between the small nut (2-3) that is threaded at the tail of the second bolt rod (2-1) and the first clamping plate (1); The optical axis segment (2-1-2) on the first bolt rod (2-1) can move left and right relative to the second clamping plate (1); The optical axis section (2-1-2) on the second bolt rod (2-1) can move left and right relative to the first clamping plate (1). 3. The clamping device for pasting the strain gauges on the beam structure strain beam according to claim 1 or 2, characterized in that, the clamping part (1-1) is a rectangular flat plate structure. 4. The clamping device for pasting strain gauges on beam-type strain beams according to claim 2, characterized in that, each bolt rod (2-1) is equipped with a detachable pressing plate (5) at the tail. 5. The clamping device for pasting strain gauges on beam-type strain beams according to claim 4, characterized in that a depression is provided on the pressing surface of the detachable pressing plate (5), and the depression is used to hold Put your finger down. 6. The clamping device for pasting the strain gages on the strain beam of the beam structure according to claim 1, characterized in that, the clamping plate (1) is made of steel. 7. The clamping device for pasting strain gauges on beam-type strain beams according to claim 1, characterized in that a rubber pad is provided on the inner side of the clamping part (1-1).