阅读说明：本技术 玻璃管厚度测量方法及装置 (Method and device for measuring thickness of glass tube ) 是由 郝艺 王世岚 田鹏 王博 周波 王丽红 闫冬成 胡恒广 于 2021-08-04 设计创作，主要内容包括：本发明提供一种玻璃管厚度测量方法及装置。所述玻璃管厚度测量方法包括以下步骤：将激光位移传感器固定于激光发射位置；在测量位置无玻璃管的情况下,获得激光位移传感器发出的激光从所述激光发射位置到所述测量位置的直射光程；将玻璃管定位于所述测量位置,获得激光位移传感器发出的激光从激光发射位置穿过所述玻璃管到所述测量位置的折射光程；结合所述直射光程和所述折射光程得到玻璃管的厚度。通过本发明的技术方案,基于两次光程的测量和对比,可实现玻璃管厚度的非接触式的测量,在满足连续生产要求的实时性时可保证玻璃管厚度的测量精确性,达到不影响产品品质和在线生产的目的。(The invention provides a method and a device for measuring the thickness of a glass tube. The glass tube thickness measuring method comprises the following steps: fixing a laser displacement sensor at a laser emission position; under the condition that no glass tube exists at the measuring position, obtaining a direct optical path of laser emitted by a laser displacement sensor from the laser emitting position to the measuring position; positioning the glass tube at the measuring position to obtain a refraction optical path of laser emitted by the laser displacement sensor from a laser emitting position to the measuring position through the glass tube; and combining the direct light path and the refraction light path to obtain the thickness of the glass tube. By the technical scheme of the invention, based on twice optical path measurement and comparison, the non-contact measurement of the thickness of the glass tube can be realized, the measurement accuracy of the thickness of the glass tube can be ensured when the real-time property required by continuous production is met, and the purposes of not influencing the product quality and on-line production are achieved.)

1. A glass tube thickness measuring method, characterized by comprising the steps of:

fixing a laser displacement sensor at a laser emission position;

under the condition that no glass tube exists at the measuring position, obtaining a direct optical path of laser emitted by a laser displacement sensor from the laser emitting position to the measuring position;

positioning the glass tube at the measuring position to obtain a refraction optical path of laser emitted by the laser displacement sensor from a laser emitting position to the measuring position through the glass tube;

and combining the direct light path and the refraction light path to obtain the thickness of the glass tube.

2. The method of measuring the thickness of a glass tube according to claim 1, wherein the thickness of the glass tube is obtained according to the following formula:

L1-L2＝4*n*t

wherein: l1: direct light path, L2: refractive optical path, n: refractive index of glass tube, t: the thickness of the glass tube.

3. A method of measuring a thickness of a glass tube as in claim 1, wherein the step of positioning the glass tube at the measurement position comprises:

and driving the two wedge-shaped blocks on the radial two sides of the glass tube to move in opposite directions, positioning the glass tube at the measuring position, and enabling the laser emission position, the circle center of the glass tube and the measuring position to be located on the same straight line.

4. A method of measuring thickness of a glass tube as in claim 3, wherein the step of driving the two wedges on both radial sides of the glass tube to move toward each other further comprises:

acquiring the glass tube information of the measuring position;

and under the condition of acquiring the information of the glass tube, driving the two wedge-shaped blocks on the two radial sides of the glass tube to move oppositely.

5. A glass tube thickness measuring apparatus (100), characterized by comprising:

a positioning mechanism (1) for positioning the glass tube (200) at a measurement position (3);

the laser displacement sensor (4) is fixed at the laser emission position (2) aligned with the measurement position (3), laser emitted by the laser displacement sensor (4) can penetrate through the glass tube (200), and the laser displacement sensor (4) is used for measuring the optical path between the laser emission position (2) and the measurement position (3).

6. The glass tube thickness measuring device according to claim 5, wherein the positioning mechanism (1) comprises a driving member (11) and a positioning assembly (12) connected to the driving member (11), the driving member (11) being configured to drive the positioning assembly (12) and to position the glass tube (200) to the measuring position (3).

7. The glass tube thickness measuring device according to claim 6, wherein the positioning assembly (12) includes two oppositely disposed wedge blocks (121), and the driving member (11) is configured to drive the two wedge blocks (121) to move toward or away from each other.

8. The glass tube thickness measuring device according to claim 6, wherein the laser emitting position (2), the center of the glass tube (200), and the measuring position (3) are located on the same line when the positioning assembly (12) positions the glass tube (200) to the measuring position (3).

9. The glass tube thickness measuring device according to claims 5 to 8, wherein the glass tube thickness measuring device (100) further comprises a laser reflector (5), the measuring position (3) being located between the laser emitting position (2) and the laser reflector (5), the laser reflector (5) being for reflecting laser light transmitted through the glass tube (200).

10. The glass tube thickness measuring device according to any one of claims 5 to 8, wherein the laser displacement sensor (4) is a blue-green laser displacement sensor (4).

Technical Field

The invention belongs to the technical field of glass manufacturing, and particularly relates to a method and a device for measuring the thickness of a glass tube.

Background

In the current continuous production mode of glass tubes, the glass tubes need to be pulled on a long runway. Some glass tube products, such as medical glass bottles, measuring cylinders, etc., have high requirements for the outer diameter, inner diameter and wall thickness of the glass tube. The existing technology for online precision measurement of the outer diameter, the inner diameter and the wall thickness of the glass tube is not mature. And the glass tube has the motion skew of level and vertical direction when moving on the runway, is unfavorable for the measurement of glass tube, and when adopting contact measurement glass tube, will influence product quality and on-line production, can not satisfy the real-time of continuous production requirement.

Disclosure of Invention

Aiming at the defects or shortcomings in the prior art, the invention provides a method and a device for measuring the thickness of a glass tube, which can measure the thickness of the glass tube in a non-contact measuring mode when meeting the real-time property required by continuous production so as to achieve the aim of not influencing the product quality and realizing online production.

In order to achieve the above object, the present invention provides a glass tube thickness measuring method, wherein the glass tube thickness measuring method comprises the steps of:

fixing a laser displacement sensor at a laser emission position;

under the condition that no glass tube exists at the measuring position, obtaining a direct optical path of laser emitted by a laser displacement sensor from the laser emitting position to the measuring position;

positioning the glass tube at the measuring position to obtain a refraction optical path of laser emitted by the laser displacement sensor from a laser emitting position to the measuring position through the glass tube;

and combining the direct light path and the refraction light path to obtain the thickness of the glass tube.

In the examples of the present invention, the thickness of the glass tube was obtained according to the following formula:

L1-L2＝4*n*t

wherein: l1: direct light path, L2: refractive optical path, n: refractive index of glass tube, t: the thickness of the glass tube.

In an embodiment of the present invention, the step of positioning the glass tube at the measurement position includes:

and driving the two wedge-shaped blocks on the radial two sides of the glass tube to move in opposite directions, positioning the glass tube at the measuring position, and enabling the laser emission position, the circle center of the glass tube and the measuring position to be located on the same straight line.

In an embodiment of the present invention, the step of driving the two wedge-shaped blocks on the two radial sides of the glass tube to move in the opposite direction further includes:

acquiring the glass tube information of the measuring position;

and under the condition of acquiring the information of the glass tube, driving the two wedge-shaped blocks on the two radial sides of the glass tube to move oppositely.

The present invention also provides a glass tube thickness measuring apparatus, the glass tube thickness measuring apparatus (100) comprising: a positioning mechanism (1) for positioning the glass tube (200) at a measurement position (3); the laser displacement sensor (4) is fixed at the laser emission position (2) aligned with the measurement position (3), laser emitted by the laser displacement sensor (4) can penetrate through the glass tube (200), and the laser displacement sensor (4) is used for measuring the optical path between the laser emission position (2) and the measurement position (3).

In an embodiment of the present invention, the positioning mechanism includes a driving member and a positioning assembly connected to the driving member, and the driving member is used for driving the positioning assembly and positioning the glass tube to the measuring position.

In an embodiment of the present invention, the positioning assembly includes two wedge blocks disposed opposite to each other, and the driving member is configured to drive the two wedge blocks to move toward or away from each other.

In the embodiment of the present invention, when the positioning assembly positions the glass tube to the measurement position, the laser emission position, the center of the glass tube, and the measurement position are located on the same line.

In an embodiment of the present invention, the glass tube thickness measuring apparatus further includes a laser reflector, and the measuring position is located between the laser emitting position and the laser reflector, and the laser reflector is configured to reflect the laser light transmitted through the glass tube.

In the embodiment of the invention, the laser displacement sensor is a blue-green laser displacement sensor.

Through the technical scheme, the glass tube thickness measuring device provided by the embodiment of the invention has the following beneficial effects:

the laser displacement sensor can be fixed at the laser emitting position firstly, under the condition that no glass tube is arranged at the measuring position aligned with the laser emitting position, the laser displacement sensor is adopted to measure the direct light path between the laser emitting position and the measuring position, under the condition that the thickness of the glass tube needs to be measured, the glass tube can be positioned at the measuring position, the glass tube is prevented from being deviated and the measuring precision is low, then the laser displacement sensor is adopted to measure the refraction light path between the laser emitting position and the measuring position again, at the moment, the laser emitted by the laser displacement sensor penetrates through the glass tube to be refracted, the length of the light path is changed, and the thickness of the glass tube can be obtained by combining the light path under the condition that the measuring position is not provided with the glass tube, the light path under the condition that the measuring position is provided with the glass tube and the refractive index of the glass tube. The invention can realize the non-contact measurement of the thickness of the glass tube by measuring and comparing the optical path twice, can ensure the measurement accuracy of the thickness of the glass tube when meeting the real-time property required by continuous production, and achieves the aim of not influencing the quality of products and on-line production.

Additional features and advantages of the invention will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide an understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

FIG. 1 is a schematic flow chart of a method for measuring the thickness of a glass tube according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of a glass tube thickness measuring apparatus according to an embodiment of the present invention.

Description of the reference numerals

100	Glass tube thickness measuring device	2	Laser emission position
				1	Positioning mechanism	3	Measuring position
11	Driving member	4	Laser displacement sensor
				12	Positioning assembly	5	Laser reflector
121	Wedge-shaped block	200	Glass tube
				122	Wedge-shaped groove

Detailed Description

The following detailed description of specific embodiments of the invention refers to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative and explanatory of the invention and are not restrictive thereof.

The method for measuring the thickness of a glass tube according to the present invention will be described below with reference to the accompanying drawings.

As shown in fig. 1, in a first embodiment of the glass tube thickness measuring method provided by the present invention, the glass tube thickness measuring method includes the steps of:

the glass tube thickness measuring method comprises the following steps:

s10, fixing the laser displacement sensor at the laser emission position;

s20, under the condition that no glass tube is arranged at the measuring position, obtaining the direct optical path of the laser emitted by the laser displacement sensor from the laser emitting position to the measuring position;

s30, positioning the glass tube at the measuring position, and obtaining the refraction optical path of the laser emitted by the laser displacement sensor from the laser emitting position to the measuring position through the glass tube;

and S40, combining the direct light path and the refraction light path to obtain the thickness of the glass tube.

The laser displacement sensor can be fixed at the laser emitting position firstly, under the condition that no glass tube is arranged at the measuring position aligned with the laser emitting position, the laser displacement sensor is adopted to measure the direct light path between the laser emitting position and the measuring position, under the condition that the thickness of the glass tube needs to be measured, the glass tube can be positioned at the measuring position, the glass tube is prevented from being deviated and the measuring precision is low, then the laser displacement sensor is adopted to measure the refraction light path between the laser emitting position and the measuring position again, at the moment, the laser emitted by the laser displacement sensor penetrates through the glass tube to be refracted, the length of the light path is changed, and the thickness of the glass tube can be obtained by combining the light path under the condition that the measuring position is not provided with the glass tube, the light path under the condition that the measuring position is provided with the glass tube and the refractive index of the glass tube. The embodiment of the invention can realize the non-contact measurement of the thickness of the glass tube by measuring and comparing the optical path twice, can ensure the measurement accuracy of the thickness of the glass tube when meeting the real-time property required by continuous production, and achieves the aim of not influencing the quality of products and on-line production.

In one embodiment, the direct optical path may be stored to avoid multiple detections of the direct optical path.

Further, a second embodiment of the glass tube thickness measuring method is proposed according to the first embodiment of the glass tube thickness measuring method provided by the present invention, S41: the thickness of the glass tube is obtained according to the following formula:

L1-L2＝4*n*t

wherein: l1: direct light path, L2: refractive optical path, n: refractive index of glass tube, t: the thickness of the glass tube.

Due to the fact that the glass material is determined, under the condition that the refractive index of the glass tube is stable, the thickness of the glass tube can be accurately obtained by measuring the direct light path and the refraction light path twice through the laser displacement sensor according to the formula.

The third embodiment of the glass tube thickness measuring method according to the first embodiment of the glass tube thickness measuring method provided by the present invention, S31: the step of positioning the glass tube at the measurement position includes:

and driving the two wedge-shaped blocks on the radial two sides of the glass tube to move in opposite directions, positioning the glass tube at the measuring position, and enabling the laser emission position, the circle center of the glass tube and the measuring position to be located on the same straight line.

After the laser displacement sensor measures the direct light path, and when the glass tube needs to be subjected to thickness measurement, the two wedge blocks can be driven to enable the glass tube to be positioned at the measurement position, and the laser emission position, the circle center of the glass tube and the measurement position are sequentially arranged in the vertical direction, so that the calculation of the laser displacement sensor and the controller on the thickness of the glass tube can be facilitated, and the precision of the thickness measurement of the glass tube is improved.

According to a fourth embodiment of the method for measuring the thickness of the glass tube provided by the invention, the information of the glass tube at the measuring position is obtained;

and under the condition of acquiring the information of the glass tube, driving the two wedge-shaped blocks on the two radial sides of the glass tube to move oppositely.

The device can detect the information of the glass tube in real time through the position sensor, judge whether the thickness of the glass tube is required to be measured, and start to position the glass tube when the information of the glass tube is detected, so that the full automation of the thickness measurement of the glass tube is realized.

Referring to fig. 1, in an embodiment of the present invention, there is provided a glass tube thickness measuring apparatus, wherein the glass tube thickness measuring apparatus 100 includes a positioning mechanism 1 and a laser displacement sensor 4, the positioning mechanism 1 being used to position a glass tube 200 at a measuring position 3; the laser displacement sensor 4 is fixed at the laser emission position 2 aligned with the measurement position 3, the laser energy emitted by the laser displacement sensor 4 can pass through the glass tube 200, and the laser displacement sensor 4 is used for measuring the optical path between the laser emission position 2 and the measurement position 3.

In the embodiment of the present invention, when the glass tube thickness measuring apparatus 100 is used, in the case where the glass tube 200 is not present at the measuring position 3, the optical path between the laser emission position 2 and the measurement position 3 is measured with a laser displacement sensor 4, in the case where the thickness of the glass tube 200 needs to be measured, the glass tube 200 can be positioned at the measurement position 3 by the positioning mechanism 1, the glass tube 200 is prevented from being displaced to cause low measurement accuracy, then, the optical path between the laser emission position 2 and the measurement position 3 is measured again by using the laser displacement sensor 4, at this time, the laser emitted by the laser displacement sensor 4 penetrates through the glass tube 200 to be refracted, so that the length of the optical path changes, and the thickness of the glass tube 200 can be obtained by combining the optical path when the glass tube 200 is not arranged at the measurement position 3, the optical path when the glass tube 200 is arranged at the measurement position 3, and the refractive index of the glass tube 200. According to the embodiment of the invention, the non-contact measurement of the glass tube 200 is realized through the cooperation between the positioning mechanism 1 and the laser displacement sensor 4, the measurement accuracy of the thickness of the glass tube 200 can be ensured when the real-time property required by continuous production is met, and the purposes of not influencing the product quality and on-line production are achieved.

It is understood that after the thickness measurement of the glass tube 200 is completed, the positioning mechanism 1 can release the glass tube 200 from the measuring position 3 to allow the glass tube 200 to enter the next production process, thereby preventing the production process of the glass tube 200 from being interrupted.

In the embodiment of the present invention, the positioning mechanism 1 includes a driving member 11 and a positioning assembly 12 connected to the driving member 11, and the driving member 11 is used to drive the positioning assembly 12 and position the glass tube 200 to the measuring position 3. The driving member 11 in this embodiment can have a motor, and the driving member 11 can drive the positioning assembly 12 to make the positioning assembly 12 drive the glass tube 200 to reach and position to the measuring position 3, and through the cooperation between the driving member 11 and the positioning assembly 12, the precision of the glass tube 200 to the position can be improved, so as to facilitate the measurement of the laser displacement sensor 4 and avoid the situation that the glass tube 200 deviates from the measuring position 3.

Referring to fig. 1, in the embodiment of the present invention, the positioning assembly 12 includes two wedge blocks 121 disposed opposite to each other, and the driving member 11 is used for driving the two wedge blocks 121 to move toward or away from each other. The driving member 11 can adopt a motor, and two wedge blocks 121 are connected with one driving member 11, the movement stroke of the wedge blocks 121 can be adjusted by controlling the switch of the driving member 11, a wedge groove 122 for accommodating the glass tube 200 is formed between the two wedge blocks 121, the measuring position 3 is located between the two wedge blocks 121, when the two wedge blocks 121 move oppositely and the glass tube 200 is positioned to the measuring position 3, the wedge blocks 121 on both sides of the glass tube 200 can prevent the glass tube 200 from deviating by using the wedge structures of the wedge blocks themselves.

In the embodiment of the present invention, in order to ensure the measurement accuracy of the glass tube thickness measuring apparatus 100, when the positioning assembly 12 positions the glass tube 200 to the measurement position 3, the laser emission position 2, the center of the glass tube 200, and the measurement position 3 are located on the same straight line, and the laser emission position 2, the center of the glass tube 200, and the measurement position 3 are sequentially arranged along the up-down direction. In the embodiment of the present invention, under the condition that the transmittance of the glass tube 200 is extremely high, the glass tube thickness measuring apparatus 100 further includes a laser reflector 5, the measuring position 3 is located between the laser emitting position 2 and the laser reflector 5, the laser reflector 5 is used for reflecting laser light transmitted through the glass tube 200, the laser reflector 5 may adopt a reflector, and by laser reflection of the laser reflector 5, the condition of hundred percent light transmission is avoided, and the measuring accuracy of the laser displacement sensor 4 can be improved. Moreover, in one embodiment, to improve the measurement accuracy, the laser displacement sensor 4 is a blue-green laser displacement sensor 4 with a shorter wavelength.

In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means a plurality, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.