CN112879399B - Strain gauge pasting device - Google Patents

Abstract

The invention provides a strain gauge pasting device which is used for pasting a strain gauge at a certain position of an object and comprises an operating platform, a support, a lifting unit, an adsorption unit, a pressure head and a container for placing the pressure gauge; the lifting unit is connected with the bracket, the pressure head is fixed at the bottom of the lifting unit, and the movement of the lifting unit can drive the pressure head to lift above the operating platform; the container is provided with a groove structure, and the groove structure is matched with the strain gauge structure and used for accommodating the strain gauge; the pressure head can extend into the container, and the strain gauge is adsorbed on the bottom surface of the pressure head under the action of the adsorption unit. Compared with the existing artificial bonding strain gauge, the bonding device disclosed by the invention has the advantages that the strain gauge is bonded at the position to be bonded of an object through the bonding device, the bonding precision and the bonding quality are improved, the labor cost is reduced, the automation degree is improved, and the bonding device is suitable for different strain gauge structures and sizes.

Description

A strain gauge sticking device

technical field

The invention belongs to the technical field of strain gauges, and in particular relates to a strain gauge sticking device.

Background technique

A strain gauge is an element used to measure strain and is often used in sensors.

A multi-dimensional force/torque sensor is a sensor that can detect force or torque information in two or more directions at the same time, and plays an important role in many fields such as robotics, aerospace, and biomedicine. The strain gauge multi-dimensional force/torque sensor is a kind of multi-dimensional force/torque sensor, including an elastic body and a strain gauge bonded to the elastic body. In the working state, the elastic body is deformed under the action of external force or torque. The electrical signal of the strain gauge changes, and the force or torque information is obtained by detecting the change of the electrical signal of the strain gauge.

At present, in the multi-dimensional force/torque sensor of strain gauge type, sticking the strain gauge on the elastic body is mainly done by hand, that is, the operator holds the strain gauge, applies glue on the surface of the strain gauge, and then sticks it in a certain position and presses it to make it fixed. This manual method has many problems, such as the inability to ensure the accuracy of the pasting position, the inability to ensure the consistency of the pressing force, etc., which has become one of the factors affecting the performance of the sensor. In particular, the commonly used strain gauge multi-dimensional force/torque sensor is small in size, so the area of the strain gauge is also small, usually no more than 10mm × 10mm, which increases the difficulty of manual pasting, and it is difficult to ensure the integrity of the operation.

SUMMARY OF THE INVENTION

In view of the above technical situation, the present invention provides a strain gauge sticking device, by which the strain gauge can be stuck on an object, and the sticking position accuracy and sticking quality can be improved.

The technical solution provided by the present invention is: a strain gauge sticking device for sticking the strain gauge on a certain position of an object, characterized in that: the sticking device includes an operating table, a bracket, a lifting unit, an adsorption unit, and an indenter, and a container for placing piezo-transformable tablets;

The lifting unit is connected with the bracket, the indenter is fixed at the bottom of the displacement unit, and the displacement unit can perform vertical lifting movement, driving the indenter to rise and fall above the operating table;

The container is provided with a groove structure, and the groove structure is adapted to the strain gauge structure for accommodating the strain gauge; the pressure head can extend into the container, and the strain gauge is adsorbed on the pressure gauge under the action of the adsorption unit. the underside of the head;

In the working state, the object is placed on the operating table; the adsorption unit works so that the strain gauge is adsorbed on the bottom surface of the indenter; the side of the strain gauge facing the object is coated with adhesive; the movement of the lifting unit drives the indenter to move to the position where the object is to be bonded Then the lifting unit performs a downward movement to make the strain gauge and the object bond at the position to be bonded, and the adsorption unit stops working; when the strain gauge and the object are firmly bonded, the lifting unit rises, and the object with the bonded strain gauge is taken out.

The adsorption unit is used to provide a force that enables the strain gauge to be adsorbed on the bottom surface of the indenter.

The manner in which the adsorption unit adsorbs the strain gauge is not limited. As an implementation manner, the adsorption unit adopts negative pressure adsorption, including a vacuum generator and a pipeline communicated with the vacuum generator, the pressure head is provided with a number of ventilation holes, the vacuum generator works, and the pipeline is communicated with the ventilation holes. A negative pressure is formed at the bottom of the indenter, and the strain gauge is adsorbed on the bottom surface of the indenter.

The structure of the lifting unit is not limited. As an implementation manner, the lifting unit includes a connecting piece that can be lifted vertically and a turntable connected to the connecting piece. The turntable rotates to drive the connecting piece to displace in the vertical direction, thereby driving the ram to move up and down.

In the actual bonding process, air bubbles are often retained between the strain gauge and the object, which affects the bonding effect. Preferably, in the present invention, an indenter base is arranged between the indenter and the bottom of the lifting unit. The indenter base is movably connected to one end of the indenter, and is connected to the other end of the indenter through a spring. In the natural state of the spring, the indenter base is connected to the The indenter forms a certain angle at the movable connection end. When the lifting unit descends, one end of the indenter connected to the spring first comes into contact with the object. When the indenter continues to press down, the contact surface between the strain gauge and the object gradually increases under the combined action of the spring and the hinge, and finally comes into full contact. It is beneficial to avoid air bubbles between the bonding surfaces and further improve the bonding effect. Preferably, the included angle is 5-15°.

The fixed connection method between the indenter and the lifting unit is not limited, including chuck connection, slot connection, clamping connection, and screw-fastening connection.

The material of the indenter is not limited, and it is preferably a skin-like soft rubber, which can not only avoid damage to the strain gauge during pasting, but also distribute the force more evenly during continuous pressing.

Preferably, a support plate is also provided above the lifting unit. When the strain gauge and the object are bonded at the position to be bonded, a weight is placed on the support plate, thereby increasing the pressure of the indenter, and realizing the adhesion at the bonding position. Continue pressing to further improve the bonding effect.

Compared with the existing artificially bonded strain gauges, the present invention sticks the strain gauges on the to-be-bonded position of the object through the bonding device, which improves the bonding accuracy and bonding quality on the one hand, and reduces labor costs on the other hand. The degree of automation is improved, and it can be adapted to different strain gauge structures and sizes.

Description of drawings

FIG. 1 is a schematic structural diagram of a strain gauge sticking device according to Embodiment 1 of the present invention.

FIG. 2 is an enlarged view of the indenter portion in FIG. 1 .

FIG. 3 is a schematic view of the bottom surface structure of the indenter in FIG. 1 .

FIG. 4 is a schematic structural diagram of the container according to Embodiment 1 of the present invention.

FIG. 5 is a schematic diagram of the strain gauge in the container in Example 1 of the present invention.

FIG. 6 is a schematic diagram of the indenter embedded in the container in Example 1 of the present invention.

FIG. 7 is a schematic diagram of bonding between the indenter and the elastomer for the adsorption strain gauge in Example 1 of the present invention.

1-5 are: 1-operating table; 2-vacuum generator; 3-support; 4-lifting unit; 5-turntable; 6-pipeline; 7-press block; 8-sensor; 9- Indenter base; 10-indenter; 11-spring; 12-vent hole; 13-groove; 14-structure; 16-strain gauge; 18-container; 19-support plate; 20-weight.

Detailed ways

The present invention will be further described in detail below with reference to the embodiments and the accompanying drawings. It should be noted that the following embodiments are intended to facilitate the understanding of the present invention, but do not have any limiting effect on it.

Example 1:

As shown in FIGS. 1-4 , the sticking device includes an operating table 1 , a bracket 3 , a lifting unit 4 , an adsorption unit, an indenter 10 , and a container 18 for placing the pressure-transforming sheet 16 .

The lifting unit 4 is connected with the bracket 3 , the ram 10 is fixed on the bottom of the lifting unit 4 , the lifting unit 4 can perform vertical lifting motion, and the driving ram 10 can perform lifting motion above the operating table 1 .

As shown in Figures 4 and 5, the container 18 has a structure 14 matched with the structure of the pressure head, so that the pressure head can extend into the container. A groove 13 is provided in the structure 14 , and the groove 13 is adapted to the structure of the strain gauge 16 for accommodating the strain gauge 16 . When the strain gauge 16 is placed in the groove 13 of the container 18 , it will not move. One end of the lead 17 of the strain gauge is placed outside the container. Different types of strain gauges correspond to grooves of different sizes.

In this embodiment, the adsorption unit adopts negative pressure adsorption, and includes a vacuum generator 2 and a pipeline 6 communicating with the vacuum generator. As shown in FIG. 3 , the pressure head 10 is provided with several ventilation holes 12 , the vacuum generator 2 works, the pipeline 6 is connected with the ventilation holes 12 , and a negative pressure is formed at the bottom of the pressure head 10 , and the strain gauge 16 can be adsorbed on the pressure head 10 . underside.

In this embodiment, the lifting unit includes a connecting piece (not shown in the figure) that can be displaced in the vertical direction, and a turntable 5 connected with the connecting piece. The turntable 6 rotates to drive the connecting piece to displace in the vertical direction, thereby driving the pressure head 10 Carry out the lifting movement.

In this embodiment, as shown in FIG. 2 , an indenter base 9 is arranged between the indenter 10 and the bottom of the displacement unit 4 , and one end of the indenter base 9 and the indenter 10 is movably connected with the other end of the indenter through a hinge. The spring 11 is connected. In the natural state of the spring 11, the indenter base 9 and the indenter 10 form an included angle of 10° at the movable connection end.

In this embodiment, the material of the indenter is skin-like soft rubber. The indenter is clamped at the bottom of the displacement unit by a three-jaw chuck.

In this embodiment, a support plate 19 on which weights 20 can be placed is further provided above the lifting unit.

In this embodiment, the sticking device is used for sticking strain gauges in a strain gauge multi-dimensional force/torque sensor. The strain gauge multi-dimensional force/torque sensor 8 includes an elastic body and a strain gauge bonded to the elastic body.

The paste method is as follows:

Place the elastic body in the strain gauge multi-dimensional force/torque sensor on the operating table, and use the pressing block 7 to press and fix the elastic body on the operating table;

The strain gauges are placed in the grooves 13 of the container 18 . As shown in FIG. 6 , the pressure head 10 is embedded in the structure 14 of the container 18 , the vacuum generator 2 works, the pipeline 6 is communicated with the ventilation hole 12 , and a negative pressure is formed at the bottom of the pressure head 10 to reduce the strain in the groove 13 . The sheet 16 is adsorbed on the bottom surface of the indenter; the adhesive is coated on the side of the strain gauge facing the elastomer;

As shown in FIG. 7 , the lifting unit 4 moves up and down to drive the indenter 10 above the position where the elastic body is to be bonded, and then the lifting unit 4 moves downward to bond the strain gauge 10 and the elastic body at the position to be bonded. In this process, one end of the indenter connected to the spring first contacts the elastic body. When the indenter continues to press down, the contact surface between the strain gauge and the elastomer gradually increases under the combined action of the spring and the hinge. The weight 20 is placed on the support plate 19, thereby increasing the pressure of the indenter 10, realizing continuous pressing on the bonding position, and improving the bonding effect.

The above embodiments describe the technical solutions of the present invention in detail. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Anything done within the scope of the principles of the present invention Any modifications, additions or substitutions in similar manners, etc., shall be included within the protection scope of the present invention.

Claims (9)

1. A strain gauge sticking device for sticking the strain gauge on a certain position of an object, characterized in that: the sticking device comprises a console, a bracket, a lifting unit, an adsorption unit, an indenter, and a device for placing the strain gauge container; The lifting unit is connected with the bracket, the pressure head is fixed at the bottom of the lifting unit, the lifting unit can perform vertical lifting movement, and the driving pressure head can be lifted and lowered above the operating table; The container is provided with a groove structure, and the groove structure is adapted to the strain gauge structure for accommodating the strain gauge; the pressure head can extend into the container, and the strain gauge is adsorbed on the pressure gauge under the action of the adsorption unit. the underside of the head; In the working state, the object is placed on the operating table; the adsorption unit works so that the strain gauge is adsorbed on the bottom surface of the indenter; the side of the strain gauge facing the object is coated with adhesive; the movement of the lifting unit drives the indenter to move to the position where the object is to be bonded Then the lifting unit moves downwards, so that the strain gauge and the object are bonded at the position to be bonded, and the adsorption unit stops working; when the strain gauge and the object are firmly bonded, the lifting unit rises, and the object with the bonded strain gauge is taken out; An indenter base is arranged between the indenter and the bottom of the lifting unit. The indenter base is movably connected to one end of the indenter, and is connected to the other end of the indenter through a spring. Under the natural state of the spring, the indenter base and the indenter are movably connected. The ends form a certain angle. 2 . The strain gauge sticking device according to claim 1 , wherein the adsorption unit adopts negative pressure adsorption, comprising a vacuum generator and a pipeline communicating with the vacuum generator, and the pressure head is provided with several ventilation holes; 2 . When the generator works, the pipeline is connected with the vent hole, and a negative pressure is formed at the bottom of the indenter, and the strain gauge is adsorbed on the bottom surface of the indenter. 3 . The strain gauge sticking device according to claim 1 , wherein the lifting unit comprises a connecting piece that can be displaced in a vertical direction and a turntable connected to the connecting piece, and the turntable rotates to drive the connecting piece in the vertical direction. 4 . Displacement, thereby driving the indenter to move up and down. 4 . The strain gauge sticking device according to claim 1 , wherein the fixed connection between the indenter and the lifting unit includes chuck connection, slot connection, clamping connection or screw-fastening connection. 5 . 5 . The strain gauge sticking device according to claim 1 , wherein the material of the indenter is skin-like soft rubber. 6 . 6 . The strain gauge sticking device according to claim 1 , wherein a support plate is further arranged above the lifting unit, and when the strain gauge and the object are bonded at the position to be bonded, the weight is placed on the support plate. 7 . 7 . The strain gauge sticking device according to claim 1 , wherein the area of the strain gauge is less than or equal to 10 mm×10 mm. 8 . 8. The strain gauge sticking device according to claim 1, wherein the included angle is 5-15°. 9 . The strain gauge sticking device according to claim 1 , wherein the object is an elastic body in a multi-dimensional force/torque sensor. 10 .

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