KR101074330B1 - Apparatus for measuring breaking strength of glass plate and measuring method thereof - Google Patents

Abstract

The present invention provides a glass fracture strength measuring apparatus and a measuring method thereof, which can measure the degree of warpage of the glass from the initial load and the load applied at that moment, and analyze the change in warpage from the time it is completely destroyed.
Glass breakdown strength measuring apparatus according to the present invention is a fixed frame provided so that the glass plate is mounted on both ends, a breaking tip for applying a compressive load to the glass plate mounted on the fixing frame, a load cell provided to detect the breaking strength on the top of the breaking tip, load cell upper A lifting means for elevating the breakdown tip, a rotation-linear motion converting means connected to an elevating means, a servo motor connected to a rotation-linear motion converting means to generate a rotational force, a control unit for controlling the servo motor, and a load of a load cell and It characterized in that it comprises a measuring unit for measuring the degree of bending by corresponding to the rotational force of the servo motor set to a specific displacement value.

Description

Apparatus for measuring breaking strength of glass plate and measuring method

The present invention relates to a glass breaking strength measuring apparatus and a measuring method thereof, and more particularly, to a measuring device having a precision pressing means and a warpage measuring means and a measuring method for precisely measuring the breaking strength of the glass.

In general, the compression and tensile strength measuring device is a device for measuring the strength by artificially applying a compressive or tensile load to the specimen of the mechanical component. The compression and tensile strength measuring apparatus can improve the stability and reliability of the finished product by measuring the breaking strength of the component to be used in the finished product in advance.

1 is a cross-sectional view showing a conventional compressive and tensile strength measuring apparatus, the conventional compressive and tensile strength measuring apparatus 10 is the upper frame 7 and the lower fixedly installed on the top and bottom of the guide bar (5, 6) The actuator 1, the load cell 3 and the specimen holder 4 are mounted to the frame 8, respectively, and the actuator 1 and the load cell 3 reciprocate by a predetermined distance of the height adjusting part 2, respectively. to be.

However, the conventional compressive and tensile strength measuring device 10 is equipped with a dedicated device to apply a certain section of load to a certain distance by using a fixed actuator (1), it is not possible to measure various loads as well as load cell ( 3) and the calibration of the actuator 1 were not possible. In addition, the hydraulic device in the fixing device adds cost and limited travel distance, and has a problem in that only the maximum value at the time of breaking is included among the loads applied when the mechanical device is bent.

On the other hand, the failure test of the conventional glass plate is a method of measuring the falling ball falling at a predetermined height, although easy and simple, precise fracture strength measurement and the degree of warpage at the time of failure is not known.

SUMMARY OF THE INVENTION An object of the present invention is to provide a glass fracture strength measuring apparatus and a measuring method thereof, which can measure the degree of warpage of the glass from the initial load and the load applied at that moment, and analyze the change in bending from the time it is completely destroyed. have.

It is still another object of the present invention to provide a glass breaking strength measuring apparatus and measuring method thereof, which are capable of precise measurement, and can achieve safety and convenience in testing.

The measuring device according to the present invention for solving the above problems is a fixed frame provided so that the glass plate is mounted, a breaking tip for applying a compressive load to the glass plate mounted on the fixing frame, a load cell provided to detect the breaking strength on the top of the breaking tip, Lifting means for elevating the breakdown tip on the load cell, rotation-linear motion conversion means connected to the elevating means, servo-motor connected to the rotation-linear motion conversion means for generating a rotational force, a control unit for controlling the servo motor and the load cell It includes a measuring unit for measuring the degree of bending and the breaking strength by matching the load and the rotational speed of the servo motor with the set specific displacement.

According to a preferred embodiment of the present invention, the measuring unit is a display device for displaying the set value and the measured value, including the size of the fixing frame, the maximum load value, the bending degree of the breakdown point, the strength of the breakdown point, and an output for printing the measured value The device is further included.

According to a preferred embodiment of the present invention, the rotation-linear motion converting means includes a gear module for converting the rotation of the servo motor.

According to a preferred embodiment of the present invention, the gear module consists of a bevel gear or a worm gear.

According to a preferred embodiment of the present invention, the lifting means includes a screw which is connected to the rotating shaft and rotates, and a screw block which is formed outside the screw and lifts the breaking tip according to the rotation of the screw.

According to a preferred embodiment of the present invention, the screw block has a quadrangular shape in order to cancel the torsional rotational force, and includes at least one pair of ball linear bearings outward for smooth linear motion.

According to a preferred embodiment of the present invention, the load cell can be replaced by providing a plurality of types having different measurement ranges.

According to a preferred embodiment of the present invention, the fracture tip has a U-shaped or double U-shaped shape, and the size of the tip has a range of 0.1 to 30.0 mm.

On the other hand, the method of measuring the breaking strength of the glass according to the present invention, the step of mounting the glass plate on the fixed frame, the rotational speed of the screw according to the rotational speed of the servo motor, and set the moving distance of the screw block according to the rotational speed of the screw The step of applying a pulse to the servomotor, the compressive load is transmitted to the tip, the step of measuring the deformation signal of the load cell according to the compression load, the step of calculating the bending degree by measuring the screw displacement amount and the measurement based on the set value Analyzing the generated values.

According to a preferred embodiment of the present invention, the servo motor is set such that the screw is rotated by one rotation and the screw block is moved by 1 µm when 10000 pulses are applied.

According to the glass breaking strength measuring apparatus and the measuring method according to the present invention, the compressive load is applied to the glass plate through the servomotor and the screw, so that the buffer means of the conventional complicated structure is unnecessary, so the configuration is simple and convenient to use. .

In addition, the degree of warpage of the glass and the load applied at that time can be recorded at each moment from the time of the first load, and the degree of warpage and the degree of warpage can be measured.

In addition, it is possible to test the glass plate of various sizes by arranging the fixing frame according to the size of the glass plate, and it is possible to accurately measure by placing a plurality of load cells for measuring the size of the load, and the fracture tip that touches the glass plate has various sizes. It can be tested under different conditions so that accurate measurement can be made.

1 is a cross-sectional view showing a conventional compression and tensile strength measuring apparatus,
Figure 2 is a photograph showing the overall shape of the glass breaking strength measuring device of the present invention,
3a to 3b are photographs and cross-sectional views showing the internal configuration of the test and measurement space,
4a to 4b are perspective views showing the fixing frame and the U-shaped and double U-shaped fracture tip of various sizes,
Figure 5a is a cross-sectional view showing a state in which the screw block is raised,
5B is a cross-sectional view taken along line AA ′ of FIG. 5A;
Figure 5c is a cross-sectional view showing a state in which the screw block is lowered,
6A to 6B are views illustrating a display apparatus in which a displacement value is set;
7a to 7b is a figure showing the form of the static pressure test and the resulting output value,
8 is a configuration diagram showing a configuration of a destructive test result derivation system;
9 is a flow chart showing a glass breaking strength measuring method of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The illustrated drawings illustrate only the essential contents for clarity of the invention and omit the additional ones, and thus should not be construed as limited to the drawings.

2 is a photograph showing the overall shape of the breaking strength measuring apparatus 100 according to an embodiment of the present invention, the breaking strength measuring apparatus 100 is a test and measurement space 110, the upper measuring equipment is installed therein, the upper A display device 150 for displaying a measurement result and a set value, etc. on one side, and an output device 160 for outputting the measurement result on the other side is provided. In addition, the glass fragment recovery box 170 is installed below the breakdown strength measuring apparatus 100 so that the glass fragments broken by the test can be easily collected. It goes without saying that the above configuration can be modified in various positions.

3A and 3B are photographs and cross-sectional views illustrating the configuration of the test and measurement space 110, and include a fixing frame 111 and a glass plate mounted on the fixing frame 111 to allow the glass plate 112 to be mounted thereon. Destructive tip 113 to apply a load by pressing 112, a load cell (114) is installed on the top of the breaking tip 113, elevating means 120 is installed on the load cell 114, elevating means 120 It is composed of a servo motor 145 connected to the gear module 140 and the gear module 140 is installed on the top to generate a rotational force. Hereinafter, the above-described configuration will be described in more detail.

4A to 4B are perspective views illustrating fracture tips of various sizes of fixing frames 111 and 111 'and U-shaped 113 and double U-shaped 113' shapes, and the fixing frames 111 and 111 'have various sizes. It may be formed into a shape. That is, it can be replaced in various forms according to the type and size of the glass plates 112 and 112 'to be measured. For example, the small fixing frame 111 may be used to measure the breaking strength of the small glass plate 112, and the medium to large fixing frame may be used to measure the breaking strength of the large glass plate 112 '. (111 ') is used. In addition, it is possible to replace and use various types of shapes and sizes of the fracture tips 113 and 113 'that directly apply the load to the glass plates 112 and 112' mounted on the fixing frames 111 and 111 '. That is, the shapes of the breaking tips 113 and 113 'touching the glass plates 112 and 112' may be various shapes such as U-shaped, elongated U-shaped, two U-shaped, and the size of the tip. In addition, the tip diameter may also be variously formed to 0.1mm, 0.3mm, 1.0mm, 3.0mm, 10.0mm, 30.0mm and the like.

On the other hand, the load cell 114 is provided with a plurality of types by varying the measurement range, it is used to replace according to the type of glass plate 112 to be measured. That is, the glass plate 112 to be measured has various types such as tempered glass, double glass, laminated glass, and selects and replaces an appropriate load cell 114 to measure various measurement ranges according to the characteristics of the glass plate 112. . For example, the maximum load measurable load of the load cell 114 may be provided as 200Kg, 500kg, 2000kg, 5000kg, etc. At this time, the maximum load value of the mounted load cell may be displayed on the display.

5A to 5C are cross-sectional views showing the internal structure of the elevating means 120, FIG. 5A shows a state in which the screw block 122 is raised, FIG. 5B is a cross-sectional view AA ′ of FIG. 5A, and FIG. 5C is a screw Block 122 is in the lowered state. The elevating means 120 is a screw 121 connected to the rotary shaft 130, a screw block 122 for elevating the breaking tip 113 by the rotation of the screw 121, the screw 121 and the screw block 122 Consists of the lifting means outer wall 123 surrounding the outside.

The screw 121 is in the form of a screw provided with a ball 125 in a regular groove formed to a predetermined depth is connected to the rotating shaft 130 and serves to elevate the screw block 122, the screw ( A ball bearing 124 for linear movement is provided between the elevating means outer wall 123 and the screw block 122 in order to offset the torsion of the screw block 122 due to the rotational force of 121. At least one pair of ball bearings 124 for the linear motion is provided symmetrically, preferably a pair of left and right sides of the screw block 122 having a quadrangular shape as shown in FIG. 5B. By such a configuration, the torsional rotational force due to the rotation of the screw 121 can be canceled, and the screw block 122 can perform a smooth linear motion to reduce the measurement error.

On the other hand, the elevating means 120 is mounted on the gear module 140 is connected to the rotary shaft 130. The gear module 140 changes the direction of rotation. Preferably, the gear module 140 rotates in the 90 ° direction from the gear module 140 as the servo motor 145 provided at right angles to the rotation shaft 130 rotates. Bevel gears or worm gears and the like may be provided so that the changed vertical rotational force is obtained and the rotation shaft 130 may rotate. The rotary shaft 130 and the rotary motor can be directly connected, but since the shaft of the rotary motor is subjected to compression or tensile pressure, damage to the motor can occur, and this problem can be solved by using a gear module. Do.

The servo motor 145 connected to the gear module 140 transmits the rotational force to the screw 121 so that the screw block 122 of the elevating means 120 can be lifted or lowered.

Based on the above-described configuration, with reference to the accompanying drawings a preferred embodiment of the destruction result deriving system of the fracture strength measuring apparatus 100 according to the present invention will be described in detail with reference to FIGS.

6A to 6B are views showing a display device in which a displacement value is set, and FIGS. 7A to 7B are diagrams showing the type of the static pressure test and the output result according thereto, and FIG. 8 shows the configuration of the failure test analysis system. As a block diagram, the failure test analysis system 200 has a maximum load value 151, a tip diameter 152 that is the size of the fracture tip 113, a moving speed 153 of a lifting means, a moving distance, and a glass thickness 154. ), The control unit 210 that can set the size of the fixing frame 111, the maximum load value 151, and the like, the degree of warpage of the glass 112 and the degree of warpage at the time of breakdown 155 to fracture strength 156 based on the set value. ) And a display unit 230 for outputting the set value and the calculated result value. In addition, the display unit 230 preferably includes a display device 150 and an output device 160. The display device 150 may input a setting value by a touch screen method (FIGS. 6A and 6B) and the output device 160 may be a printer.

An operation process of the control unit 210, the measurement unit 220, and the display unit 230 of the analysis system 200 will be described below.

When the pitch of the screw 121 is 1 cm, 1 cm is moved in one rotation. When the screw 121 is set to rotate one time when 10000 pulses are applied to the servo motor 145, the lifting means is moved by one pulse. Screw block 122 of 120 is to be moved forward or downward by 1㎛. Therefore, if one pulse is given and the strain signal is read from the load cell 114, and one pulse is given again, the strain signal is read from the load cell 114, and the relationship between the strain signal after the applied pulse is analyzed by graphing or data. , The load applied to the glass 112 used in the fracture test and the degree of warpage at that time are calculated. The deflection degree is 1 pulse since the compressive load of the fracture tip 113 is not "0" (that is, it may vary depending on glass, but the fracture tip falls and the glass comes into contact with a value from "0"). It is converted into 1 micrometer per sugar. When the pulse is measured from the time when the load cell 114 signal is not " 0 ", the distance at which the breaking tip 113 is moved at that time appears. Since there is no buffer portion in the middle of the glass to be measured, the glass is bent by the traveled distance, and thus the degree of warpage until breakage, that is, the degree of warpage 115 at the time of breakage can be measured, and the measured value is displayed on the display device 150. When displayed on or output by the output device 160, the degree of warpage and the breaking strength 156 of the glass can be easily seen at a glance (FIGS. 7A and 7B).

On the other hand, in the method of measuring the breaking strength using the glass breaking strength measuring apparatus 100, the step of mounting the glass plate 112 to the fixing frame 111, the screw according to the rotational speed of the servomotor 145 Setting the movement distance of the screw block 122 according to the rotational speed of the 121 and the rotational speed of the screw 121, and applying a pulse to the servomotor 145 to transfer the compressive load to the breaking tip 113. Measuring the glass breakdown strength comprising the steps of measuring the deformation signal of the load cell 114 according to the compressive load, calculating the amount of deflection by measuring the screw displacement amount, and measuring and analyzing the load cell strain and screw displacement during breakdown It is about a method.

8 is a flow chart illustrating a method of measuring glass breakdown strength according to the present invention. First, the fixing frame 111 is selected and mounted according to the size of the glass plate 112 (S300), and the rotational speed of the servomotor 145 is determined. The rotation speed of the screw 121 and the moving distance of the lifting means 120 according to the rotation speed are set or calculated (S320). Then, as the lifting means 120 descends by applying rotational force to the servomotor 145, the breaking tip 113 transmits the glass plate 112 while gradually increasing a constant load (S340), and measures a signal from the load cell 114. While (S360) to analyze the set value and the measured value is to measure the degree of bending and fracture strength (S380). In addition, as described above, the servo motor 145 is preferably set such that the screw is rotated by one rotation and the screw block 122 of the elevating means 120 moves 1 μm when 10000 pulses are applied.

By doing in this way, the degree of bending of the glass plate 112 and the load applied at that time can be precisely measured at every moment, and the change in bending until complete destruction can be analyzed. We can plan.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Do.

100: fracture strength measuring device 110: test and measurement space
111, 111 ': Fixing frame 112: glass plate
113, 113 ': Destroyed tip 114: Load cell
120: lifting means 121: screw
122: screw block 123: outer wall
124: ball bearing for linear motion 130: axis of rotation
140: gear module 145: servo motor
150: display device 151: maximum load value
152: tip diameter 153: moving speed
154 glass thickness 155 bending degree at break
156: breaking strength 160: output device
200: analysis system 210: control unit
220: measuring unit 230: display unit

Claims (10)

Fixing frame provided so that the glass plate is mounted;
Breaking tip for applying a compressive load to the glass plate mounted on the fixed frame;
A load cell provided on the top of the breaking tip to detect breaking strength;
A screw installed on the load cell and lifting means of the breaking tip, the screw connected to the rotating shaft and the screw installed in the quadrangular outer wall to offset the torsional rotational force of the screw, and the ball bearing for linear motion is supported between the outer wall block;
A rotation-linear motion conversion gear module connected to an upper portion of the screw rotation shaft;
A servo motor connected to the rotation-linear motion gear module to generate a rotation force;
A control unit for controlling the servomotor with a pulse; And
Glass breaking strength measuring device comprising a measuring unit for reading the deformation signal for each pulse applied to measure the degree of bending and breaking strength.
The method of claim 1,
The measuring unit may further include a display device for displaying a set value and a measured value including the size of the fixing frame, the maximum load value, the bending degree at the break point, and the strength at the break point, and an output device for printing the measured value. Glass breaking strength measuring device.
delete delete delete delete The method of claim 1,
The load cell is a glass breaking strength measuring device, characterized in that the replacement by having a plurality of different types of measuring range.
The method of claim 1,
The fracture tip is glass breaking strength measuring device, characterized in that the U-shaped or paired U-shaped.
In the method of measuring the breaking strength by using the glass breaking strength measuring device according to claim 1,
Mounting a glass plate on the fixing frame;
Setting the rotational speed of the screw according to the rotational speed of the servomotor and the moving distance of the screw block according to the rotational speed of the screw;
Applying a pulse to the servomotor to transfer the compressive load to the breaking tip;
Measuring a strain signal of the load cell according to the compressive load;
Calculating a degree of deflection by measuring a screw displacement for each applied pulse; And
Glass fracture strength measuring method comprising the step of measuring and analyzing the load cell deformation amount and screw displacement amount at the time of breakage.
10. The method of claim 9,
The servo motor is glass breaking strength measurement method characterized in that the screw is set to move 1㎛ when the screw is rotated 1㎛ when applying a 10,000 pulse.

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