CN102519372A - Laser thickness measuring apparatus of lithium battery electrode and working method thereof - Google Patents

Abstract

The invention relates to a laser thickness measuring device and its working method. The device includes upper and lower laser sensors arranged oppositely at both ends of a C-shaped frame mechanism. The C-shaped frame mechanism is arranged on a screw drive mechanism. The device controls the action of the screw drive mechanism to control the laser sensor to move back and forth, and detects the thickness and surface smoothness of the measured plate passing between the upper and lower laser sensors; the measured plate is transmitted through a transmission device. It is conveyed in the length direction, and the moving direction of the measured plate is perpendicular to the output laser beam of the laser sensor. According to the reciprocating motion trajectory of the laser beam on the upper and lower surfaces of the tested plate, the scanning range of the measured plate surface is expanded, and the flatness of the entire surface of the plate is detected, and the measurement accuracy can be controlled according to the driving circuit connected to the industrial computer. The mechanism drives the reciprocating speed of the laser sensor to control it. The higher the reciprocating speed, the higher the measurement accuracy.

Description

Laser thickness measuring device for lithium battery electrode and its working method

technical field

The invention relates to the technical field of laser detection of plate thickness, in particular to a laser thickness measurement device and a working method thereof.

Background technique

In the process of plate production, it is very important to detect the thickness of the plate, which will directly affect the subsequent process.

With the continuous development of thickness measurement technology, there are many methods for the measurement of plate thickness, such as laser transmission method, ultrasonic measurement and so on. Different measurement methods have different technical characteristics and application ranges. Nowadays, non-contact measurements such as laser thickness measurement have been used for thickness measurement of plates. The laser measurement method is non-contact and can be measured online with good real-time performance.

However, because the laser sensor is often stationary when it is working, the plate under test is driven through the laser sensor by the guide roller, and the thickness of a certain point on the surface of the plate can only be fixed to determine whether it is qualified; but the surface of the entire object cannot be tested. Thickness, flatness, etc., it is easy to miss the unqualified plate with a certain thickness on the surface, but other positions are uneven.

Chinese patent document CN1800776A discloses a laser thickness measuring device. When it works, the plate to be measured passes between the laser sensors. This solution also has the problem that it is impossible to detect the flatness of the entire surface of the plate to be tested, and it is easy to miss the problem of unqualified plates.

Contents of the invention

The technical problem to be solved by the present invention is to provide a laser thickness measuring device and its working method that can expand the scanning coverage of the measured plate thickness and measure the overall flatness of the measured plate.

In order to solve the above-mentioned technical problems, the present invention adopts a laser thickness measuring device, which includes upper and lower laser sensors arranged oppositely at both ends of the C-shaped frame mechanism. On the screw drive mechanism, the drive circuit of the screw drive mechanism is connected to an industrial computer, and the industrial computer is connected to an encoder for detecting the rotation amount of the screw in the screw drive mechanism; the industrial computer is controlled by the encoder. The action of the screw drive mechanism is to control the reciprocating movement of the laser sensor and detect the thickness and surface smoothness of the measured plate passing between the upper and lower laser sensors; The plate is conveyed along the length direction through a transmission device, and the moving direction of the measured plate is perpendicular to the output laser beam of the laser sensor. According to the back-and-forth motion trajectory of the laser beam on the upper and lower surfaces of the tested plate, the scanning range of the measured plate surface is expanded, and the flatness of the entire surface of the plate is detected, and the measurement accuracy can be controlled according to the drive circuit connected to the industrial computer. The mechanism drives the reciprocating speed of the laser sensor to control it. The higher the reciprocating speed, the higher the measurement accuracy.

Further, in order to make the measured plate pass through the laser beam emitted by the laser sensor smoothly, the transmission device includes: placed on the left and right sides of the C-shaped frame mechanism and drive the measured plate to pass through the upper and lower laser sensors A pair of guide rollers parallel to each other.

Further, in order to keep the tested sheet material to be conveyed at a constant speed, the transmission device also includes: a winding mechanism for winding the sheet material, and a tension sensor is provided in the rolling mechanism to detect the tension of the sheet material after it is rolled up. The thickness is used to control the angular velocity of the winding shaft in the winding mechanism, so that the measured plate can be kept at a constant speed.

Further, in order to enable the laser sensor to completely return and leave the measured material, which is convenient for mechanical maintenance and automatic calibration of the system, the horizontal movement distance of the C-frame mechanism is not greater than the span of the C-frame mechanism.

Further, the plate to be tested can be a lithium battery electrode film or a battery pole piece.

The working method of the above-mentioned laser measuring device comprises the following steps:

①. First calibrate the distance between the upper and lower laser sensors, that is, the distance between the two laser sensors is equal to the distance from the upper surface of the standard measured plate to the upper laser sensor, the distance from the lower surface of the standard measured plate to the lower laser sensor, and the distance between the standard measured plate and the lower laser sensor. The sum of the thicknesses of the tested plates;

②. After recording the calibration data, control the C-frame mechanism to move horizontally to the working position, and use the laser sensor to measure the edges on both sides of the plate to be tested, so as to determine that the screw drive mechanism drives the laser sensor in the The range of reciprocating movement in the width direction of the tested plate;

③. The screw drive mechanism drives the laser sensor to move back and forth. The transmission device drives the measured plate to pass between the upper and lower laser sensors. The laser beams of the upper and lower laser sensors are on the upper and lower surfaces of the measured plate. For scanning detection, the industrial computer processes the data of the plate under test collected by the laser sensor to obtain thickness data and surface roughness data.

Further, in order to improve the accuracy of detecting the surface roughness of the measured plate, the speed at which the screw drive mechanism drives the laser sensor to make reciprocating motion is increased through the industrial computer.

Further, in order to divide the unqualified length area of the measured plate, the tension sensor in the transmission device controls the rewinding shaft to drive the measured plate to be conveyed at a constant speed, and the industrial computer detects the flatness of the upper and lower surfaces of the measured plate through the laser sensor. Measure the length of the plate, when the surface of the plate is detected as unqualified, it will be marked as the starting point of the unqualified length area, and the industrial computer will start recording the length of the unqualified length area through the laser sensor at the same time, until the upper and lower surfaces of the measured plate are detected to be qualified If it is marked as the end point of the unqualified length area, and the length of the unqualified length area is obtained, then the unqualified length area in the measured plate is divided.

The technical effects of the present invention: (1) The scanning detection range of the measured plate is enlarged through the reciprocating movement of the laser sensor, and the thickness of the measured plate and the flatness of the upper and lower surfaces of the plate can be accurately obtained; (2) The scanning detection range of the plate Expanded to make the collected data more comprehensive and accurate, and it is not easy to cause missed detection of unqualified plates (3) It can mark the unqualified length area of the tested plate and measure the length of this area.

Description of drawings

In order to make the content of the present invention more easily understood, the present invention will be described in further detail below in conjunction with the specific embodiments according to the accompanying drawings, wherein

Fig. 1 is a schematic diagram of the laser thickness measuring device of the present invention.

Fig. 2 is a schematic diagram of the transmission device in the laser thickness measuring device of the present invention.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the present invention is described in detail:

(Example 1)

As shown in Fig. 1-2, the laser thickness measuring device of the present embodiment comprises upper and lower laser sensors 11, 12, and these two laser sensors are relatively arranged at the two ends of the C-shaped frame mechanism 2, and the C-shaped frame mechanism 2 is arranged on a On the screw drive mechanism 5 that controls its linear displacement.

The driving circuit of the screw drive mechanism 5 is connected with an industrial computer, and the industrial computer is connected with an encoder 4 for detecting the amount of rotation of the screw mandrel in the screw drive mechanism 5; the industrial computer is controlled by the encoder 4. The action of the screw drive mechanism 5 is to control the laser sensor to move back and forth, and detect the thickness and surface smoothness of the measured plate 9; The moving direction of the plate 9 is perpendicular to the output laser beam of the laser sensor, and the plate 9 to be measured passes between the two laser sensors.

According to the back-and-forth motion trajectory of the laser beam on the upper and lower surfaces of the measured plate 9, the scanning range of the surface of the measured plate 9 is expanded to detect the flatness of the entire surface of the plate, and the measurement accuracy can be controlled according to the driving circuit connected to the industrial computer. The back-and-forth speed of the laser sensor is controlled by the rod transmission mechanism 5, and the higher the back-and-forth speed, the higher the measurement accuracy.

The transmission device includes: a pair of parallel guide rollers 8 placed on the left and right sides of the C-shaped frame mechanism 2 and driving the measured plate 9 to pass through the upper and lower laser sensors 11 and 12 .

The transmission device also includes: a winding mechanism for winding the sheet material, and a tension sensor is provided in the winding mechanism to detect the thickness of the sheet material 9 after being rolled to control the winding shaft 10 in the winding mechanism The angular velocity of the rotation keeps the measured plate 9 at a constant speed, and the length of the measured plate 9 can be calculated according to the uniform conveying speed of the measured plate 9 combined with the time of the laser sensor’s round-trip scanning, and the unqualified length area of the measured plate can be further obtained The length of the distance between the start and end points.

The horizontal movement distance of the C-frame mechanism 2 is not greater than the span of the C-frame mechanism 2, so that the laser sensor can completely return and leave the measured material, which is convenient for mechanical maintenance and system automatic calibration.

The laser sensor is used to quickly scan back and forth on the upper and lower surfaces of the entire measured plate. The laser sensor can detect a wide range of plates, including lithium battery electrode film or battery pole piece and precision thickness measurement in other fields, such as special organic And inorganic materials, non-ferrous metal foil/strip, metal rolling, solar wafers, semiconductors and other irregular materials.

(Example 2)

The working method of the laser measuring device of described embodiment 1, comprises the following steps:

①. First calibrate the distance between the upper and lower laser sensors 11 and 12, that is, the distance between the two laser sensors is equal to the distance from the upper surface of the standard measured plate 9 to the upper laser sensor 11, and the distance from the lower surface of the standard measured plate 9 to the lower surface. The sum of the distance of the laser sensor 12 and the thickness of the standard measured plate 9;

2. After recording the calibration data, control the C-frame mechanism 2 to move horizontally to the working position, use the laser sensor to measure the edges on both sides of the measured plate 9, and determine that the screw drive mechanism 5 drives the laser sensor at The range of reciprocating motion in the width direction of the measured plate 9;

③. The screw drive mechanism 5 drives the laser sensor to move back and forth, and the transmission device drives the measured plate 9 to pass between the two laser sensors, and the laser beam of the laser sensor scans the upper and lower surfaces of the measured plate 9 For detection, the industrial computer processes the data of the plate under test collected by the laser sensor to obtain thickness data and surface roughness data.

The speed of the reciprocating motion of the laser sensor driven by the screw drive mechanism 5 is controlled by the industrial computer, and the accuracy of the surface flatness of the measured plate 9 is improved by increasing the speed of the reciprocating motion.

The tension sensor in the transmission device controls the winding shaft to drive the measured plate to be conveyed at a constant speed. The industrial computer measures the length of the plate while detecting the flatness of the upper and lower surfaces of the measured plate 9 through the laser sensor. When the surface of the plate is detected to be unqualified When it is marked as the starting point of the unqualified length area, and the industrial computer starts to record the length of the unqualified length area through the laser sensor, it is marked as the end point of the unqualified length area when the upper and lower surfaces of the measured plate 9 are qualified, and After obtaining the length of the unqualified length area, the unqualified length area in the measured plate 9 is divided.

Apparently, the above-mentioned embodiments are only examples for clearly illustrating the present invention, rather than limiting the implementation of the present invention. For those of ordinary skill in the art, on the basis of the above description, other changes or changes in different forms can also be made. It is not necessary and impossible to exhaustively list all the implementation manners here. And these obvious changes or modifications derived from the spirit of the present invention are still within the protection scope of the present invention.

Claims (8)

1. a thickness measurement with laser device comprises the upper and lower laser sensor that is oppositely arranged (11,12) of being located at C type frame mechanism (2) two ends, C type frame mechanism (2) be located at one be used to control its straight-line displacement lead screw transmission mechanism (5), it is characterized in that:

The driving circuit of lead screw transmission mechanism (5) links to each other with an industrial computer, and the scrambler (4) of rotation amount that industrial computer and is used for detecting the screw mandrel of said lead screw transmission mechanism (5) links to each other;

Industrial computer is controlled the action of said lead screw transmission mechanism (5) through scrambler (4); Make back and forth movement to control said upper and lower laser sensor (11,12), and detect from the thickness and the surface smoothness of the tested sheet material (9) that passes between the described upper and lower laser sensor (11,12);

The tested sheet material of said transmission (9) carries out transmitting by length direction through a gearing, and the direction of motion of this tested sheet material (9) is perpendicular to the outgoing laser beam of said upper and lower laser sensor (11,12).

2. thickness measurement with laser device according to claim 1 is characterized in that:

Said gearing contains: place said C type frame mechanism (2) left and right sides and drive a pair of parallel guide roller (8) that tested sheet material (9) passes said upper and lower laser sensor (11,12).

3. thickness measurement with laser device according to claim 2 is characterized in that:

Said gearing also comprises: the rolling-up mechanism that is used for rolling sheet material; And be provided with a tension pick-up in the described rolling-up mechanism; Be used for detecting sheet material (9) and controlled the angular velocity of rolling-up mechanism Scroll (10) rotation, make tested sheet material (9) transmission that remains a constant speed by the thickness after the rolling.

4. thickness measurement with laser device according to claim 1 is characterized in that: the distance that said C type frame mechanism (2) moves horizontally is very much not in the span of C type frame mechanism (2).

5. thickness measurement with laser device according to claim 1 is characterized in that: tested sheet material is electrode of lithium cell film or battery pole piece.

6. the method for work of a laser measuring device for measuring according to claim 1 is characterized in that may further comprise the steps:

1., the spacing of the fixed upper and lower laser sensor (11,12) of advanced rower, the spacing of promptly upper and lower laser sensor (11,12) equals the distance of the upper surface of the tested sheet material of standard to the lower surface of the distance of last laser sensor (11), the tested sheet material of standard to laser sensor (12) down, the thickness sum of the tested sheet material of standard;

2., control C type frame mechanism (2) is moved horizontally to the working position; With described laser sensor the dual-side edge of tested sheet material (9) is measured, made the scope of back and forth movement at said tested sheet material (9) Width to confirm described lead screw transmission mechanism (5) driving laser sensor;

3., lead screw transmission mechanism (5) drives described laser sensor and makes back and forth movement; Gearing drives tested sheet material (9) and between said upper and lower laser sensor (11,12), passes; The laser beam of upper and lower laser sensor (11,12) is done scanning at the upper and lower surfaces of tested sheet material (9) and is detected; Said industrial computer is handled the data of the tested sheet material (9) that laser sensor collects, and obtains thickness data, surfacing degrees of data.

7. the method for work of laser measuring device for measuring according to claim 6 is characterized in that: drive the speed that described laser sensor is made back and forth movement through industrial computer control lead screw transmission mechanism (5).

8. the method for work of laser measuring device for measuring according to claim 6; It is characterized in that: drive tested sheet material through the control of the tension pick-up in conveyer Scroll and at the uniform velocity transmit; Described industrial computer passes through laser sensor when detecting tested sheet material (9) upper and lower surfaces flatness; Measure the length of this sheet material; Then be labeled as defective length areas starting point when plate surface detects when defective, and industrial computer is through the laser sensor length of opening entry this defective length areas simultaneously, is labeled as the terminal point of said defective length areas when upper and lower surfaces is qualified up to the tested sheet material of detection (9); And obtain the length of this defective length areas, underproof length areas is divided out in the then tested sheet material (9).

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