CN214703194U - Device for testing low-temperature viscosity of glass by bending method - Google Patents
Device for testing low-temperature viscosity of glass by bending method Download PDFInfo
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- CN214703194U CN214703194U CN202120794049.4U CN202120794049U CN214703194U CN 214703194 U CN214703194 U CN 214703194U CN 202120794049 U CN202120794049 U CN 202120794049U CN 214703194 U CN214703194 U CN 214703194U
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Abstract
The utility model relates to a glass test equipment field discloses a device of bending method test glass low temperature viscosity, include: a heating furnace (1) having a heating chamber; a glass holder (2) which is placed in the heating chamber and is capable of supporting the glass (3) to be measured with a suspended portion between different support positions; the pressure rod (4) extends along the vertical direction and is arranged to apply pressure to a suspended part of the glass to be measured supported on the glass support so as to synchronously move downwards along with the flexural deformation of the glass to be measured in the heating process of the heating cavity; and the displacement detector (6) is arranged on the test bench (8) and can measure the displacement of the pressure rod in the vertical direction. The utility model discloses a pressure is exerted to the glass that awaits measuring with the pressure pole of vertical extension to testing arrangement, with its self gravity direct action in the portion of suspending of awaiting measuring glass, can keep invariable pressure from this in the testing process and in the test of different samples.
Description
Technical Field
The utility model relates to a glass test equipment specifically relates to a device of bending method test glass low temperature viscosity.
Background
The low-temperature viscosity of glass generally means the viscosity of glass in a non-liquid state, and has an important influence in glass products and electronic display panel glass. Due to the limitation of the glass form, the low-temperature viscosity of the glass cannot be measured by a rotational viscometer aiming at the high-temperature liquid viscosity. The testing of annealing point and strain point is of great interest and application as two important parameters for the low temperature viscosity of glass.
In the conventional art, glass testing equipment generally measures the annealing point of glass by a glass fiber drawing method. For this reason, it is necessary to reheat, melt, and draw a sheet glass produced in a production line into a wire. The method not only puts forward higher requirements on operators in the wire drawing process, but also changes the sample by secondary heating and melting, and increases energy waste and unsafe factors.
In this case, a bending viscosity test method and a corresponding test apparatus are proposed. This type of test equipment determines the annealing point by measuring the viscous deflection rate of the midpoint of a simply loaded glass strut, and then extrapolates to determine the strain point. According to different force application modes, the viscosity testing equipment by the bending method is divided into a horizontal type tester and a pull-down type tester, the structure is complex, and the problems that the pressure is not constant, the testable sample is single and the like exist.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the unsteady scheduling problem of pressure among the glass low temperature viscosity test that prior art exists, providing a device of bending method test glass low temperature viscosity, the device can apply invariable pressure to the glass that awaits measuring to be convenient for be applicable to the sample test of different shapes.
In order to achieve the above object, the present invention provides a device for testing low temperature viscosity of glass by bending method, comprising: a heating furnace having a heating chamber; the glass support is arranged in the heating cavity and is provided with a plurality of different supporting positions in the same horizontal plane so as to support the glass to be measured to be provided with a suspended part between the different supporting positions; the pressure rod extends along the vertical direction and is arranged to apply pressure to a suspended part of the glass to be detected supported on the glass support so as to synchronously move downwards along with the flexural deformation of the glass to be detected in the heating process of the heating cavity; and the displacement detector is arranged on the test bench and can measure the displacement of the pressure rod in the vertical direction.
Preferably, the end part of the glass bracket for supporting the glass to be tested is provided with an inner side surface and an outer side surface which are close to each other and obliquely extend relative to a vertical plane.
Preferably, the top end of the glass support is rectangular and open.
Preferably, a positioning base for placing the glass support is arranged in the heating cavity, and one sides of the positioning base and the glass support, which are connected with each other, are respectively provided with a positioning matching structure.
Preferably, the positioning matching structure comprises a positioning groove formed on the positioning base and a positioning bulge arranged at the bottom of the glass support.
Preferably, one end of the pressure rod, which is far away from the glass support, is connected with an induction rod extending along the vertical direction, and the displacement detector measures the displacement of the pressure rod by detecting the displacement of the induction rod.
Preferably, the device has a collimating aperture disposed around the pressure bar.
Preferably, the pressure rod is provided at its periphery with a limiting boss located above the alignment hole to limit the downward movement limit of the pressure rod.
Preferably, the bottom end of the pressure rod has a prismatic indenter with an edge extending in the horizontal direction for applying pressure to the glass to be tested.
Preferably, the device comprises a controller which is connected with the heating furnace through signals to control the temperature change in the heating cavity.
Through the technical scheme, the utility model discloses with the pressure bar of vertical extension to the glass that awaits measuring applys pressure, with its self gravity direct action in the portion of suspending of the glass that awaits measuring, can keep invariable pressure from this in the testing process and in the test of different samples. By the force application mode, the glass bracket can support sheet, block, rod-shaped and other glass samples, and is convenient for testing low-temperature viscosity parameters such as annealing points, strain points and the like of samples in different shapes.
Drawings
FIG. 1 is a schematic view of an apparatus for testing low temperature viscosity of glass by bending according to a preferred embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of the glass holder of FIG. 1 along a vertical cross-section in a state of supporting a glass to be measured.
Description of the reference numerals
1-heating a furnace; 2-a glass support; 21-positioning a projection; 3-glass to be detected; 4-a pressure bar; 41-limiting boss; 42-prismatic indenter; 5-positioning the base; 51-a positioning groove; 6-displacement detector; 7-an induction rod; 8-a test bench; 81-alignment holes; 9-a controller; 10-computer.
Detailed Description
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings. It is to be understood that the description of the embodiments herein is for purposes of illustration and explanation only and is not intended to limit the invention.
Referring to fig. 1, the device for testing the low temperature viscosity of glass by the bending method according to the preferred embodiment of the present invention comprises a heating furnace 1, a glass support 2, a pressure bar 4, etc. by measuring the viscous deflection rate of the glass 3 to be tested at different temperatures, the low temperature viscosity parameters such as annealing point and strain point can be calculated.
The heating furnace 1 has a heating chamber, so that the heating chamber can be heated by an electric heating wire, and the glass 3 to be measured can be bent and not be melted. The glass holder 2 is placed in the heating chamber and has a plurality of different support positions in the same horizontal plane so as to be able to support, for example, a sheet-like glass 3 to be measured with a suspended portion between the different support positions. For example, in the preferred embodiment shown in the figure, the glass holder 2 is a column with a rectangular opening at the top, and the top edge thereof can be used to contact and support the bottom surface of the glass 3 to be measured, so as to suspend the glass to be measured between the two top edges. In this case, the pressure rod 4 described later may act on the suspended portion to apply a pressure that causes the glass 3 to be measured to be viscously deflected.
In the testing process, the glass 3 to be tested is horizontally supported on the glass support 2, and the upper side of the glass 3 to be tested is provided with a pressure rod 4 for applying pressure. The pressure rod 4 extends and moves in the vertical direction, and the bottom end thereof acts on the suspended portion of the glass 3 to be measured. Therefore, as the heating furnace 1 is heated, the temperature in the heating cavity rises, the gravity of the pressure rod 4 acts on the glass 3 to be measured, so that the glass 3 to be measured is subjected to flexural deformation, and simultaneously, the pressure rod 4 synchronously moves downwards. In the process, the viscous deflection rate of the glass 3 to be measured at different heating temperatures in the heating cavity is obtained, so that low-temperature viscosity parameters such as the annealing point and the strain point of the glass can be determined.
The testing device applies pressure to the glass 3 to be tested by the vertically extending pressure rod 4, and directly acts the self gravity on the suspended part of the glass 3 to be tested, thereby maintaining constant pressure in the testing process and different sample tests. By the force application mode, the glass bracket 2 can support sheet-shaped, block-shaped, rod-shaped and other glass samples, and is convenient for testing low-temperature viscosity parameters such as annealing points, strain points and the like of samples in different shapes.
It is to be understood that the glass holder 2 may be formed in various structural forms or support the glass 3 to be measured in various ways as long as it enables the glass 3 to be measured to be supported with a suspended portion. For example, the glass holder 2 may be formed in a separate structure to support different portions of the glass 3 to be measured, respectively.
The glass holders 2 and the pressure bars 4 should have a good heat resistance, since they are subjected to high temperatures during the test, either entirely or partly, in the heating chamber of the furnace 1. For this purpose, a material thereof, such as a corundum material, may be appropriately selected.
In the illustrated preferred embodiment, the test apparatus further comprises a displacement probe 6 for measuring the amount of displacement of the pressure bar 4 in the vertical direction, the displacement probe 6 being mounted on a test bench 8, the pressure bar 4 extending through the table of the test bench 8 into the furnace 1 below.
Specifically, displacement detector 6 passes through the support mounting on testboard 8, and the one end (the upper end) of keeping away from glass support 2 of pressure bar 4 is connected with along the response pole 7 of vertical direction extension, and this response pole 7 passes displacement detector 6's detection zone and extends to can be surveyed by this displacement detector 6 and obtain response pole 7 along with the displacement amount of pressure bar 4 in vertical direction. Through connect the response pole 7 that matches with displacement detector 6 on pressure bar 4, can avoid directly setting up induction element on the pressure bar like the corundum material to need not to change induction element after pressure bar 4 damages, practice thrift the maintenance cost.
In order to guide the pressure rod 4 to move in the vertical direction to maintain a constant pressure during the thermal bending of the glass 3 to be tested as a test sample, a straightening hole 81 surrounding the pressure rod 4 may be provided on the test table 8. This alignment hole 81 can be for the slice round hole structure of adjustably installing on testboard 8 to can adjust before the test to make pressure bar 4 pass alignment hole 81 and extend, guarantee that it can freely reciprocate, and prevent the card and hinder.
During the test, the pressure bar 4 can be prevented from being continuously displaced downward by the controller 9 described later by controlling the temperature in the heating furnace 1. This control method is relatively slow in limiting the movement of the pressure rod 4, and therefore, a limiting boss 41 located above the alignment hole 81 may be further provided on the periphery of the pressure rod 4 to limit the downward movement limit of the pressure rod 4.
In the glass holder 2 described above, as shown in fig. 2, the top edge is used to support the glass 3 to be measured. The inner side surface and the outer side surface of the glass support 2 can extend close to each other at the top end part, namely the inner side surface and the outer side surface are inclined relative to a vertical plane at the end part position, so that a supporting edge angle with an angle alpha is formed, two-line supporting can be formed when the glass 3 to be tested is pressed, and the testing accuracy is improved.
Accordingly, for uniform application of force, a prismatic indenter 42 may be provided at the bottom end of the pressure rod, the edge of the prismatic indenter 42 extending in the horizontal direction so as to be able to apply pressure in line contact to the glass 3 to be measured.
In the preferred embodiment shown in the figure, a positioning base 5 for placing the glass bracket 2 is further arranged in the heating cavity, and the sides of the positioning base 5 and the glass bracket 3 which are connected with each other are respectively provided with a positioning matching structure. Specifically, the positioning matching structure may include a positioning groove 51 formed on the positioning base 5 and a positioning protrusion 21 arranged at the bottom of the glass support 2, so that the placing position of the glass support 2 in the heating cavity can be determined by the positioning base 5 in different testing processes, and the testing accuracy is ensured. In other embodiments, the positioning matching structure can also be formed as other matching structures, such as a positioning protrusion arranged on the positioning base 5, a positioning groove formed on the bottom of the glass support 2 and the like.
The displacement of the pressure rod 4 measured by the displacement probe 6 may be transmitted to a controller 9, which controller 9 may be arranged in signal connection with the furnace 1 to control the temperature change in the heating chamber. Software loaded by a computer 10 transmits control information to a controller 9, the heating furnace 1 starts to heat up at a heating speed of 2-8 ℃/min, the computer software records temperature and displacement information and calculates deflection rate, the software can calculate viscosities at different temperatures by using a Fuckel formula, and the corresponding temperatures under glass annealing and strain points, namely the annealing point and the strain point of a glass sample are obtained according to the corresponding relation between the viscosities and the temperatures.
In the above preferred embodiment of the present invention, the glass support 2 can be correspondingly disposed according to the glass 3 to be measured. For example, for a rod-shaped sample, a limiting structure may be arranged at the top end of the glass support 2 to prevent the sample from falling. The heating furnace 1 used may be of various suitable types or may employ different heating devices as long as it can accurately control the temperature change and be accurately measured.
The following description will be made in conjunction with the testing device of the preferred embodiment of the present invention:
(1) cutting the long cover plate glass into glass strips of 100mm x 15mm, grinding the edges of the glass strips by 800 meshes to remove burrs, grinding the glass strips to be flat, controlling the two sides of a sample to be parallel, and controlling the size deviation to be 15 +/-0.05 mm;
(2) opening a furnace door of the heating furnace, placing a sample on a glass bracket made of corundum, wherein the long edge of the sample is vertical to the supporting edge of the glass bracket, placing a pressure rod down to enable the edge of the prismatic pressure head to be parallel to the supporting edge of the glass bracket, uniformly stressing the sample, and closing the furnace door;
(3) the alignment hole is adjusted to ensure that the induction rod is positioned in the middle of the displacement detector and the pressure rod can freely move up and down without being blocked;
(4) sequentially turning on a controller power supply, a computer and test control software of the test device, confirming that the instrument is under the control of the software, turning on a heating power supply, setting a protection temperature, raising the temperature to 750 ℃ at the maximum, and setting a protection displacement, wherein the maximum displacement is 5 mm; setting a temperature rise curve, enabling the furnace to rise at a speed of 4 ℃/min, determining that the computer software records temperature and displacement values during temperature rise, and carrying out online recording;
(5) after the test was completed, several temperature and displacement coordinates were selected, and a curve of temperature and viscosity was fit with software, and the corresponding annealing point and strain point of the glass sample were obtained by defining viscosity 1013dpa $, 1014.5dpa $, and temperature.
The results of the tests on the three samples are given in table 1 below.
TABLE 1
Table 2 shows the results of the tests on the same three samples using the tensile method.
TABLE 2
It can be seen that compare in traditional testing arrangement and method, utilize the utility model discloses the sample test data standard deviation of testing arrangement and method is less than 1.5, and is more accurate reliable.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited thereto. The technical idea of the utility model within the scope, can be right the utility model discloses a technical scheme carries out multiple simple variant, makes up with any suitable mode including each concrete technical feature. In order to avoid unnecessary repetition, the present invention does not separately describe various possible combinations. These simple variations and combinations should also be considered as disclosed in the present invention, all falling within the scope of protection of the present invention.
Claims (10)
1. An apparatus for testing low temperature viscosity of glass by bending method, comprising:
a heating furnace (1), the heating furnace (1) having a heating chamber;
the glass support (2) is arranged in the heating cavity and is provided with a plurality of different supporting positions in the same horizontal plane, so that the glass (3) to be measured can be supported to have a suspended part between the different supporting positions;
the pressure rod (4) extends along the vertical direction and is arranged to apply pressure to a suspended part of the glass (3) to be tested supported on the glass support (2) so as to synchronously move downwards along with the flexural deformation of the glass (3) to be tested in the heating process of the heating cavity; and the number of the first and second groups,
and the displacement detector (6) is arranged on the test bench (8) and can measure the displacement of the pressure rod (4) in the vertical direction.
2. The device for testing the low-temperature viscosity of glass by a bending method according to claim 1, wherein the end of the glass support (2) for supporting the glass (3) to be tested has inner and outer sides which extend obliquely to a vertical plane close to each other.
3. The device for testing the low-temperature viscosity of glass by the bending method according to claim 1, wherein the top end of the glass support (2) is rectangular open.
4. The device for testing the low-temperature viscosity of the glass by the bending method according to claim 1, wherein a positioning base (5) for placing the glass support (2) is arranged in the heating cavity, and the side, connected with each other, of the positioning base (5) and the glass support (2) is respectively provided with a positioning matching structure.
5. The bending method glass low-temperature viscosity testing device according to claim 4, wherein the positioning matching structure comprises a positioning groove (51) formed on the positioning base (5) and a positioning bulge (21) arranged at the bottom of the glass bracket (2).
6. The device for testing the low-temperature viscosity of the glass by the bending method according to claim 1, wherein an induction rod (7) extending in the vertical direction is connected to one end of the pressure rod (4) far away from the glass support (2), and the displacement detector (6) is used for measuring the displacement of the pressure rod (4) by detecting the displacement of the induction rod (7).
7. The device for testing the low-temperature viscosity of glass by bending according to claim 1, wherein the device has a straightening hole (81) arranged around the pressure bar (4).
8. The apparatus for testing low-temperature viscosity of glass by bending according to claim 7, wherein the pressure bar (4) is provided at its periphery with a limit boss (41) located above the alignment hole (81) to limit the downward movement limit of the pressure bar (4).
9. The device for testing the low-temperature viscosity of glass by a bending method according to claim 1, wherein the bottom end of the pressure rod (4) is provided with a prismatic indenter (42), and the prismatic indenter (42) is provided with an edge extending along the horizontal direction and used for applying pressure to the glass (3) to be tested.
10. The apparatus for testing the low-temperature viscosity of glass by bending according to claim 1, wherein the apparatus comprises a controller (9) in signal communication with the heating furnace (1) for controlling the temperature change in the heating chamber.
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| CN202120794049.4U CN214703194U (en) | 2021-04-16 | 2021-04-16 | Device for testing low-temperature viscosity of glass by bending method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113125303A (en) * | 2021-04-16 | 2021-07-16 | 河南旭阳光电科技有限公司 | Device for testing low-temperature viscosity of glass by bending method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113125303A (en) * | 2021-04-16 | 2021-07-16 | 河南旭阳光电科技有限公司 | Device for testing low-temperature viscosity of glass by bending method |
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Assignee: Beijing Zhongding Weihe Technology Co.,Ltd. Assignor: DONGXU OPTOELECTRONIC TECHNOLOGY Co.,Ltd. Contract record no.: X2023110000063 Denomination of utility model: Device for testing low-temperature viscosity of glass using bending method Granted publication date: 20211112 License type: Common License Record date: 20230515 Assignee: Baotou Xingraw Material Technology Co.,Ltd. Assignor: Beijing Zhongding Weihe Technology Co.,Ltd. Contract record no.: X2023110000064 Denomination of utility model: Device for testing low-temperature viscosity of glass using bending method Granted publication date: 20211112 License type: Fen Xuke Record date: 20230515 |
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