Multifunctional wind tunnel balance strain gauge pressing device

Abstract

The multifunctional wind tunnel balance strain gauge pressing device has the main function of pressing strain gauges for sensors of various shapes. The device mainly includes a lockable main beam, several movable aluminum sheets, and side fastening blocks. Since the elastic beams of various types of sensors have different sizes, the corresponding pressing plates need to be processed for pressing after the sensors are pasted. The main application process of the device is to first fix the position of each aluminum sheet according to the shape of the sensor patch position, as shown in the figure, and then use two clamps to press the strain gauge. The feature of the present invention is that it can ensure that the force acting on the strain gauge is relatively balanced, and it can be used as a reusable device for most sensor pressing.

Description

Technical Field

[0001] The invention relates to a multifunctional wind tunnel balance strain gauge pressing device. Background Art

[0002] Strain gauge pressure sensors are a common structural form in force sensors. Their structure can flexibly design the form of elastic sensitive elements to adapt to various applications. Therefore, strain gauge pressure sensors made of strain gauges are still widely used in the aerospace industry, electric power industry and other industries as well as other high-precision stress testing fields. Elastic strain elements include cantilever beams, fixed beams, Π-shaped beams, annular beams, thin-walled cylinders, etc. They can be combined into various types according to different needs. After designing the elastic beam, strain gauges need to be pasted at the corresponding positions. The most commonly used strain gauge is the adhesive strain gauge.

[0003] Since the quality of the patch directly affects the measurement accuracy, the pasted strain gauge needs to be given a certain pressure in the oven to squeeze out the bubbles between the strain gauge and the elastic beam to ensure that the strain gauge is completely attached to the elastic beam. The requirements for the pressing device are also extremely high. The direction of the pressure must be parallel to the strain gauge. The pressing device is not allowed to exert lateral force on the strain gauge. The existing pressing devices are mostly two thin plates. For different elastic beams, suitable pressing plates are required. Moreover, the pressing plates are generally fixed at both ends, and the force is difficult to control. It is easy to damage the strain gauge or cause unsatisfactory pressing effects. Summary of the invention

[0004] The technical problem solved by the present invention is: to overcome the shortcomings of the prior art and provide a multifunctional wind tunnel balance strain gauge pressing device, which can be used to press strain gauges for sensors of various shapes. The device can ensure that the force acting on the strain gauge is relatively balanced, can be applied to the pressing devices of different elastic beams of most sensors, and can be reused.

[0005] The technical solution of the present invention is: a multifunctional wind tunnel balance strain gauge pressing device, including a positioning device and an aluminum sheet;

[0006] The positioning device is provided with two groups, each including a main beam and two side beams; the two side beams are fixedly installed on both sides of the main beam; the main beam is provided with a hollow groove for the aluminum sheet to pass through; the side of the main beam is provided with a fastening knob for locking and fixing the aluminum sheet in the hollow groove; the side of the two side beams are provided with a fastening block for connecting and fixing the side beams of the two groups of positioning devices;

[0007] The aluminum sheet is provided with two groups, which respectively pass through the hollow slots of the two positioning devices and respectively contact one end of the strain gauge sensor to be compressed between the two positioning devices.

[0008] Furthermore, the aluminum sheet is selected to have a corresponding width according to the size and shape of the elastic beam of the wind tunnel balance.

[0009] Furthermore, the positions of the two side beams are adjusted as required.

[0010] Furthermore, the aluminum sheet can move freely in the hollow groove when it is not locked.

[0011] Furthermore, the aluminum sheet can be provided in multiple numbers according to requirements to fit elastic beams of different shapes and sizes.

[0012] Furthermore, the aluminum sheet on the side beam is used to support the side beam, so that the force point of the side beam is completely on the protruding aluminum sheet, and the action surface of the side beam is the strain flattened on the balance elastic beam.

[0013] Furthermore, the two groups of side beams are not fitted and opposed to each other, the middle aluminum sheet is a supporting member, and a gap is left between the two groups of side beams for locking.

[0014] The advantages of the present invention compared with the prior art are:

[0015] (1) The present invention selects a certain number of movable aluminum sheets to combine corresponding crimping surfaces according to the size and position of the strain gauge, so that the pressure is more concentrated on the surface of the strain gauge, thereby avoiding the generation of bubbles in the strain gauge;

[0016] (2) The present invention fixes the aluminum sheet by cooperating with the locking crossbeam, and is applicable to deformation beams and strain gauges of different sizes;

[0017] (3) The present invention achieves a technical effect in which two devices are locked in opposition to each other so that each point of the strain gauge is subjected to uniform force and the pressure fully covers the surface of the strain gauge, thereby achieving a better bonding effect between the strain gauge and the deformation amount. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a rendering of the present invention, and is a stereoscopic view of the multifunctional sensor strain gauge pressing device of the present invention when in use;

[0019] Figure 2 is a three-dimensional schematic diagram of a special sensor according to the present invention;

[0020] Figure 3 It is a three-dimensional diagram of the main beam and the connecting mechanism of the multifunctional sensor strain gauge pressing device of the present invention;

[0021] Figure 4 It is a three-dimensional diagram of the main beam of the multifunctional sensor strain gauge pressing device of the present invention;

[0022] Figure 5 The embedded aluminum strip of the present invention is assembled on the main beam and can slide up and down on the main beam. DETAILED DESCRIPTION

[0023] In order to better understand the above technical scheme, the technical scheme of the present application is described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present application and the specific features in the embodiments are detailed descriptions of the technical scheme of the present application, rather than limitations on the technical scheme of the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments can be combined with each other.

[0024] The following is a further detailed description of the multifunctional wind tunnel balance strain gauge pressing device provided in the embodiment of the present application in conjunction with the accompanying drawings of the specification. The specific implementation method may include (eg Figures 1 to 5 As shown): including a positioning device and an aluminum sheet;

[0025] The positioning device is provided with two groups, each including a main beam and two side beams; the two side beams are fixedly installed on both sides of the main beam; the main beam is provided with a hollow groove for the aluminum sheet to pass through; the side of the main beam is provided with a fastening knob for locking and fixing the aluminum sheet in the hollow groove; the sides of the two side beams are provided with fastening blocks for connecting and fixing the side beams of the two groups of positioning devices; the aluminum sheet is provided with two groups, respectively passing through the hollow grooves of the two positioning devices, and respectively contacting one end of the strain gauge sensor to be compressed between the two positioning devices. The aluminum sheet selects the corresponding width according to the size and shape of the elastic beam of the wind tunnel balance. The positions of the two side beams are adjusted as needed. The aluminum sheet can move freely in the hollow groove when it is not locked. The aluminum sheet can be set in multiples according to needs to fit the elastic beams of different shapes and sizes. The aluminum sheet on the side beam is used to support the side beam, so that the force point of the side beam is completely on the extended aluminum sheet, and the action surface of the side beam is the strain flattening on the elastic beam of the balance. The two groups of side beams are not fitted and opposite, the middle aluminum sheet is a support, and a gap is left between the two groups of side beams for locking.

[0026] Further, in the embodiments provided in the embodiments of the present application, specifically including:

[0027] (1) The main beam can be locked.

[0028] (2) Several movable aluminum sheets,

[0029] (3) Side fastening block.

[0030] Since the elastic beams of different sensor models have different sizes, the corresponding pressing plates need to be processed after the sensors are pasted. The main application process of this device is to first select a certain number of aluminum sheets according to the shape of the sensor patch position for locking, such as Figure 1 As shown, two of the clamps are then used to compress the strain gauge. The feature of the present invention is that it can ensure that the force acting on the strain gauge is relatively balanced, and the device can be used to compress most sensor gauges into a reusable device.

[0031] The following is a specific combination Figure 2The sensor introduces the use of the multifunctional sensor strain gauge pressing device. First, determine the sensor patch position, such as Figure 2 As shown in Figure 1, the multifunctional sensor strain gauge pressing device is used by two sets of devices. First, use one half to adjust the position of the aluminum sheet and fix it: the specific operation steps are as follows: loosen the fastening knob on the main beam of the multifunctional sensor strain gauge pressing device. At this time, the aluminum sheet can move freely up and down along the side beam direction. Place the plane or curved surface of the sensor to be patched upward, so that the aluminum sheet of the multifunctional sensor strain gauge pressing device falls freely on the strain gauge to check whether it is fully covered. Then tighten the fixing knob on the main beam of the multifunctional sensor strain gauge pressing device, and the aluminum sheet will no longer move. It can be understood that a certain number of aluminum sheets are selected, and their area is the strain gauge pressing area. After locking, the selected aluminum sheet composition can completely cover the surface of the strain gauge. The other half of the multifunctional sensor strain gauge pressing device turns the sensor 180° and repeats the above steps. The multifunctional sensor strain gauge pressing device is finalized. Cut a rubber pad of appropriate size at the patch position to protect the multifunctional sensor strain gauge pressing device and the sensor strain gauge. Finally, dock the two multifunctional sensor strain gauge pressing devices and fix them with the bolts provided by the side beam, and the clamp function operation is completed.

[0032] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

[0033] The contents not described in detail in the specification of the present invention belong to the common knowledge of those skilled in the art.

Claims

1. Multifunctional wind tunnel balance strain gauge pressing device, characterized by: Including positioning device and aluminum sheet; The positioning device is provided with two groups, each including a main beam and two side beams; the two side beams are fixedly installed on both sides of the main beam; the main beam is provided with a hollow groove for the aluminum sheet to pass through; the side of the main beam is provided with a fastening knob for locking and fixing the aluminum sheet in the hollow groove; the side of the two side beams are provided with a fastening block for connecting and fixing the side beams of the two groups of positioning devices; The aluminum sheet is provided with two groups, which respectively pass through the hollow slots of the two positioning devices and respectively contact one end of the strain gauge sensor to be compressed between the two positioning devices.

2. The multifunctional wind tunnel balance strain gauge pressing device according to claim 1 is characterized in that: The width of the aluminum sheet is selected according to the size and shape of the elastic beam of the wind tunnel balance.

3. The multifunctional wind tunnel balance strain gauge pressing device according to claim 1 is characterized in that: The positions of the two side beams are adjusted as required.

4. The multifunctional wind tunnel balance strain gauge pressing device according to claim 1 is characterized in that: The aluminum sheet can move freely in the hollow groove when it is not locked.

5. The multifunctional wind tunnel balance strain gauge pressing device according to claim 1 is characterized in that: The aluminum sheet can be provided in plurality according to requirements to fit elastic beams of different shapes and sizes.

6. The multifunctional wind tunnel balance strain gauge pressing device according to claim 1, characterized in that: The aluminum sheet on the side beam is used to support the side beam, so that the force point of the side beam is completely on the extended aluminum sheet, and the action surface of the side beam is the strain flat on the balance elastic beam.

7. The multifunctional wind tunnel balance strain gauge pressing device according to claim 1 is characterized in that: The two sets of side beams are not fitted together and are placed opposite to each other. The middle aluminum sheet serves as a support. A gap is left between the two sets of side beams for locking.

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