TWI534418B - Screw deformation detection device - Google Patents

Description

Screw deformation detecting device

The present invention relates to a detecting device, and more particularly to a screw deformation detecting device for detecting a deformation amount of a screw.

Referring to Figure 1, the linear device 1 generally includes a long-arranged screw 11, two slide rails 12 respectively located on opposite sides of the screw 11, and a screwed to the screw 11 and slidably fitted to the slide The stage 13 of the rail 12. The stage 13 can be installed in a load (not shown) to drive the load for linear movement. In normal use, the slide rails 12 and the axis of the screw 11 are parallel to each other, and the rotation of the screw 11 can drive the stage 13 to slide along the slide rails 12, however, when the slide rails 12 are When the axial direction of the screw 11 is not parallel, the stage 13 is pulled laterally by the slide rails 12, and a lateral force F is applied to the screw 11, so that the screw 11 is slightly deformed and easily worn and damaged. If the degree of non-parallelism between the slide rails 12 and the screw 11 is too large, the screw 11 may be severely bent, causing the linear device 1 to have an overload problem.

Conventionally, a sliding dial gauge or a dial gauge is used to measure the amount of deformation of the screw 11 due to the force, so as to understand the force of the screw 11, but the method must be used in the linear device 1 Install the load In the past, the load on the stage 13 is removed, and even the stage 13 needs to be disassembled for measurement, so that it is extremely inconvenient to use.

Accordingly, it is an object of the present invention to provide a screw deformation detecting device that facilitates detecting the amount of deformation of a screw.

Thus, the screw deformation detecting device of the present invention is suitable for detecting a linear device. The linear device comprises a screw, two slide rails respectively located on two sides of the screw, and a loading platform screwed to the screw and slidably fitted to the slide rails. The screw has an opposite first end and a second end and is adapted to displace the stage along the rails. The screw deformation detecting device includes at least one first strain gauge, and a processing unit.

The first strain gauge is adhered to the first end peripheral surface of the screw, and can be deformed according to the deformation of the first end portion and change the resistance value. The processing unit signal is coupled to the first strain gauge and includes a first measurement module and a calculation module. When the stage is moved to a specific position, the first measurement module can be driven to measure the resistance change amount of the first strain gauge once. The calculation module calculates a first deformation amount representing the deformation of the first end portion according to the resistance change amount measured by the first measurement module.

2‧‧‧Linear device

21‧‧‧ screw

211‧‧‧ first end

212‧‧‧second end

213‧‧‧Measurement points

22‧‧‧Slide rails

23‧‧‧The stage

24‧‧‧Motor

3‧‧‧First strain gauge

4‧‧‧Second strain gauge

5‧‧‧Processing unit

51‧‧‧First measurement module

52‧‧‧Second measurement module

53‧‧‧Computation Module

Other features and advantages of the present invention will be apparent from the embodiments of the drawings, wherein: Figure 1 is a plan view illustrating a conventional linear device; Figure 2 is a partial plan view showing an embodiment of the screw deformation detecting device of the present invention and a linear device; Figure 3 is a partial front elevational view showing the embodiment and the linear device; and Figure 4 is a functional block diagram illustrating The system architecture of this embodiment.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same reference numerals.

Referring to Figures 2, 3 and 4, an embodiment of the screw deformation detecting device of the present invention is suitable for detecting a linear device 2. The linear device 2 includes a screw 21 disposed longitudinally on the left and right sides, two slide rails 22 respectively located on the front side and the rear side of the screw 21, and a screw threaded on the screw 21 and slidably mounted on the slide rails 22 The stage 23 and a motor 24 are provided. The screw 21 has a first end portion 211 and a second end portion 212 opposite to each other, and a plurality of measuring points 213 spaced along the screw 21. The stage 23 can be installed in a load (not shown) and can drive the load to move linearly. In order to achieve a better measurement result, the screw 21 of the embodiment has 20 measuring points 213, but the number of measuring points 213 is not limited thereto, but is located at the leftmost and rightmost sides. The measuring points 213 must be adjacent to both ends of the screw 21, respectively. The motor 24 can drive the screw 21 to rotate to drive the stage 23 to be displaced along the length of the slide rails 22 to the equal measuring points 213.

The screw deformation detecting device includes four first strain gauges 3, four second strain gauges 4, and one processing unit 5.

The first strain gauges 3 extend along the longitudinal direction of the screw 21 and are equally spaced around the axis of the screw 21, and are respectively adhered to the circumferential surface of the first end portion 211. In this embodiment, The first strain gauges 3 are respectively located on the top side, the bottom side, the front side, and the back side of the first end portion 211, but are not limited thereto. The first strain gauges 3 located on the front side and the back side may be deformed respectively according to the deformation of the first end portion 211 in the horizontal direction, and the resistance values are changed, and the first strain gauges located on the top side and the bottom side are respectively 3 may be deformed as the first end portion 211 is deformed perpendicular to the horizontal direction, and the resistance value is changed.

The second strain gauges 4 extend along the longitudinal direction of the screw 21 and are equally spaced around the axis of the screw 21, and are respectively adhered to the second end portion corresponding to the first strain gauges 3, respectively. 212 weeks. In this embodiment, the second strain gauges 4 are respectively disposed on the top side, the bottom side, the front side, and the back side of the second end portion 212 corresponding to the first strain gauges 3, but not in the above limit. The second strain gauges 4 located on the front side and the rear side may be deformed respectively according to the deformation of the second end portion 212 in the horizontal direction, and the resistance values are changed, and the second strain gauges located on the top side and the bottom side are respectively 4 may be deformed as the second end portion 212 is deformed perpendicular to the horizontal direction, and the resistance value is changed.

In the first and second strain gauges 3 and 4 of the embodiment, the resistance value can be changed by deformation, but other piezoelectric materials capable of generating current or voltage by deformation can be used in practice, due to various types. Moreover, the prior art is not the focus of the present invention and therefore will not be described in detail herein.

The processing unit 5 signals the first strain gauges 3 and the The second strain gauge 4 includes a first measurement module 51, a second measurement module 52, and a calculation module 53.

The first measurement module 51 can be driven when the stage 23 is located at each measurement point 213, and the resistance change amount of the first strain gauges 3 is measured once. The second measurement module 52 can be driven when the stage 23 is located at each measurement point 213, and the resistance change amount of the second strain gauges 4 is measured once. It should be noted that when the stage 23 is located at each measuring point 213, the first and second strain gauges 3, 4 are positioned on the top side, the bottom side, the front side and the back side of the screw 21 and respectively The first and second end portions 211 and 212 are correctly detected in the horizontal direction and perpendicular to the horizontal direction, and are measured by the first and second measurement modules 51 and 52. However, the first and second strain gauges 3 and 4 may be disposed on the specific four sides of the screw 21 to detect the deformation amount of the first and second end portions 211 and 212 along the specific four sides. It is not limited to this embodiment.

The calculation module 53 can calculate four first deformation amounts according to the resistance change amounts measured by the first measurement module 51 on the first strain gauges 3, and according to the second quantities The second change amount is calculated by the measurement module 52 measuring the resistance change amount measured by the second strain gauges 4. The first amount of deformation is the amount of deformation of the screw 21 caused by the lateral force on the top side, the bottom side, the front side, and the rear side of the first end portion 211. The second amount of deformation is the amount of deformation of the screw 21 due to the lateral force on the top side, the bottom side, the front side, and the back side of the second end portion 212.

When the screw deformation detecting device of the present invention is used, the stage 23 is first moved to the first measuring point 213 at the rightmost side of the screw 21, and the same First, the second strain gauges 3, 4 are positioned on the top side, the bottom side, the front side and the back side of the screw 21 and are respectively located at fixed positions, and trigger the first and second measurement modules 51, 52 to measure once. The resistance change amounts of the first and second strain gauges 3 and 4 are further calculated by the calculation module 53 to calculate the first deformation amount and the second deformation amount of the first group. At this time, the operator can know the force of the screw 21 when the stage 23 is at the first measuring point 213.

Then, the operator restarts the motor 24 to drive the screw 21 to rotate, and the carrier 23 is moved to the left. When moving to the second measuring point 213, the first and second strain gauges 3 and 4 are also Positioned on the top side, the bottom side, the front side, and the back side of the screw 21 and respectively located at a fixed position, and triggering the first and second measurement modules 51, 52 to measure the first and second strains again. The resistance change amount of the gauges 3 and 4, and the first deformation amount of the second group and the second deformation amount are calculated. At this time, the operator can know the force of the screw 21 when the stage 23 is at the second measuring point 213.

And so on, until the measurement of all the measurement points 213 is completed, so that the operator can measure that the stage 23 is located at each measurement point 213, the screw 21 is forced to be at the first and second ends. The first deformation amount of the deformation of the four sides of the portions 211, 212 and the second deformation amount, thereby understanding the force of the screw 21 during the movement of the stage 23.

In this embodiment, the first and second strain gauges 3 and 4 are disposed at the two ends of the screw 21 in order to achieve high detection accuracy, but the first strain gauge 3 may be disposed only in the implementation. One end of the screw 21 is designed to measure only the amount of deformation of the screw 21 in the horizontal direction, and only a single one of the first strain gauge 3 and a single one of the second strain gauges 4 are respectively disposed on the screw 21 The front side or the rear side of the two ends may be even provided with a single one of the first strain gauges 3 on the front side or the rear side of one end of the screw 21, which is not limited to the embodiment.

In summary, the screw deformation detecting device of the present invention measures the resistance change of the first and second strain gauges 3 and 4 a plurality of times during the movement through the stage 23, and understands the calculation result by the calculation result. The force of the screw 21 in the horizontal direction and the direction perpendicular to the horizontal direction during the movement of the stage 23 is performed. In this way, the detection can be performed without disassembling the load on the stage 23, so that the convenience of detecting the deformation of the screw 21 can be improved, and the object of the present invention can be achieved.

However, the above is only the embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the simple equivalent changes and modifications made by the patent application scope and the patent specification of the present invention are still It is within the scope of the patent of the present invention.

2‧‧‧Linear device

21‧‧‧ screw

211‧‧‧ first end

212‧‧‧second end

213‧‧‧Measurement points

22‧‧‧Slide rails

23‧‧‧The stage

24‧‧‧Motor

3‧‧‧First strain gauge

4‧‧‧Second strain gauge

Claims (1)

A screw deformation detecting device is suitable for detecting a linear device, wherein the linear device comprises a screw, two sliding rails respectively located on two sides of the screw, and a screw is screwed to the screw and slidably embedded in the sliding a loading platform of the rail, the screw has an opposite first end portion and a second end portion, and the carrier is driven to be displaced along the sliding rails, the screw deformation detecting device comprises: four first strain gauges, Arranged at equal angles around the axis of the screw, and respectively adhered to the specific four sides of the circumferential surface of the first end along the long axis of the screw, and can be deformed respectively according to the deformation of the first end portion And changing the resistance value; the four second strain gauges are equally spaced around the axis of the screw, and are respectively adhered to the specific four sides of the circumferential surface of the second end along the long direction of the screw, and The deformation may be respectively changed along with the deformation of the second end portion; and a processing unit, the signal is connected to the first strain gauge and the second strain gauge, and includes a first measurement module, a first Two measurement modules, and one calculation The screw further has a plurality of measuring points arranged along a long interval, and when the stage is moved to each measuring point, the first strain gauges are located on a specific four sides of the screw, the first measurement The module can be driven to measure the resistance change amount of the first strain gauges, and the second strain gauges are respectively located on specific four sides of the screw, and the second measurement module can be driven to measure once. The amount of resistance change of the second strain gauges, the calculation module is measurable according to the first measurement modules The amount of change in resistance is calculated as four first deformation amounts respectively representing deformations of the specific four sides of the first end portion, and the calculation module can detect the resistance changes according to the second measurement modules. For the amount, four second deformation amounts respectively representing the deformation of the specific four sides of the second end are calculated.