CN108273806A - A kind of laser cleaning equipment camera lens and laser cleaning equipment - Google Patents

Abstract

The invention belongs to the field of laser cleaning, and more specifically relates to a laser cleaning equipment lens and laser cleaning equipment, capable of zooming and precise imaging within a larger size, compact in structure, small in size and portable. The lens casing is provided with a hole for the laser to pass through, and the lens casing is fixedly connected to the upper end of the outer side of the base; the upper surface of the base is provided with a chute, the chute runs through the upper surface of the base, and the length of the chute is less than The length of the base; the convex lens base is slidingly connected with the chute, the lower end of the convex lens base is located on the inner side of the base and is fixedly connected to the lens focusing device, and the lens focusing device is fixedly connected to the inner side of the base; the galvanometer mirror base is fixedly connected to the The upper end of the outer side of the base, the laser sensor is fixedly connected to the base; the vibrating mirror is fixed on the mirror seat, and the convex lens is fixed on the convex lens mirror seat. through a convex lens.

Description

Laser cleaning equipment lens and laser cleaning equipment

technical field

The invention belongs to the field of laser cleaning, and more specifically relates to a lens of laser cleaning equipment and laser cleaning equipment.

Background technique

The precision of laser cleaning is high, and the corresponding problem is that the ideal cleaning effect can only be obtained in a very narrow range near the focus of the output laser. The existing laser cleaning equipment has good adaptability to some flat surfaces, but for uneven The metal surface cleaning effect is not good.

For such defects, there are currently two solutions as follows: 1. Add a variable-focus liquid zoom lens to the optical path to achieve zooming; 2. Change the height of the cleaning platform to adjust the distance between the workpiece to be cleaned and the lens. A Chinese invention patent for an automatic zoom laser cleaning head device and its cleaning method, patent number 201710744791.2, discloses a device that adds a zoomable liquid zoom lens to the optical path to achieve zooming. The automatic zoom laser cleaning head includes a laser generator, and the rear side of the laser generator is provided with a straightening mirror, a protective mirror and a vibrating mirror in sequence along the traveling direction of the beam, and a beam expander is arranged between the straightening mirror and the protective mirror. Mirror, a liquid zoom lens is arranged between the protective mirror and the vibrating mirror, and a focusing mirror is arranged on the rear side of the vibrating mirror along the traveling direction of the light beam. A Chinese invention patent for a liftable cleaning platform assembly and its laser cleaning equipment, patent number 201610605007.5, discloses a device that changes the height of the cleaning platform to adjust the distance between the piece to be cleaned and the lens. The liftable cleaning platform assembly includes a cleaning platform, a cleaning platform installation base, a lifting track, a cantilever roller and a lifting drive mechanism, and the cleaning platform is installed on the cleaning platform installation base; the cleaning platform installation base is slidably arranged on on the lifting track to drive the cleaning platform to rise or fall; the cantilever rollers are arranged on both sides of the cleaning platform, and the cantilever rollers are used to support the pole piece on the cleaning platform; the lifting drive mechanism is connected with the cleaning platform base, and the lifting drive mechanism It is used to drive the installation base of the cleaning platform to slide on the lifting track.

If the distance of the cleaning platform is adjusted, it is not suitable for small portable equipment. Small equipment may not be equipped with too large or even no cleaning platform. For the cleaning of parts of large non-detachable equipment, the laser cleaning equipment is often fixed at a specific position for cleaning. The cleaning platform cannot be moved. For liquid zoom lenses, the requirements for the lens are too high, and the conditions of use are limited.

The invention provides a lens of laser cleaning equipment and laser cleaning equipment. A convex lens of a special size is arranged inside the lens, which can accurately image images in a relatively large size. In addition, a lens focusing device is provided to realize zooming.

Contents of the invention

The technical problem mainly solved by the present invention is to provide a laser cleaning equipment lens and a laser cleaning equipment, which can zoom and accurately image in a larger size, and are compact in structure, small in size and portable.

In order to solve the above-mentioned technical problems, a laser cleaning equipment lens of the present invention is composed of a lens housing, a base, a convex lens holder, a galvanometer mirror holder, a laser sensor and a lens focusing device for changing the position of the convex lens holder, which can zoom and Accurate imaging within a large size, compact structure, small and portable.

The lens housing is provided with a hole for the laser to pass through, and the lens housing is fixedly connected to the upper end of the outer side of the base;

The upper surface of the base is provided with a chute, the chute runs through the upper surface of the base, and the length of the chute is less than the length of the base;

The convex lens holder is slidably connected with the chute, the lower end of the convex lens holder is located inside the base and is fixedly connected to the lens focusing device, and the lens focusing device is fixedly connected to the base inside of

The vibrating mirror base is fixedly connected to the upper end of the outer side of the base, and the laser sensor is fixedly connected to the base;

A vibrating mirror is fixed on the mirror base of the vibrating mirror, and a convex lens is fixed on the mirror base of the convex lens. . The lower half-wavelength transducer is located right below the upper half-wavelength transducer.

As a further optimization of the technical solution, the curved surface of the convex lens mirror surface described in the laser cleaning equipment lens of the present invention satisfies the following equation,

Let S be the tangent plane of the convex lens, take the left plane of the convex lens as the Y axis, pass through the midpoint of the left plane and be the X axis perpendicular to the left plane, establish the limited coordinate system of the convex lens,

Assuming that any ray parallel to the X-axis intersects the convex lens at the point Px, y, the refractive index of the convex lens relative to air is n, and the ray parallel to the X-axis intersects the X-axis after being refracted by the convex lens At point c, the distance between the origin o of the limited coordinate system and point c is L, then

Among them, C is a constant.

As a further optimization of this technical solution, the lens focusing device described in the present invention is composed of an encoder, a mounting seat, a screw drive seat, a nut block, a screw, a motor, a reducer, a shaft coupling I and a coupling The motor is fixedly connected to the mounting seat, the output shaft of the motor is connected to the reducer through the coupling I, and the output shaft of the reducer is connected to the reducer through the coupling II Connect the screw, the screw is rotatably connected in the screw drive seat, the lower end of the nut block is threaded on the screw, the upper end of the nut block is fixedly connected to the convex lens holder, the encoder Fixedly connected to the screw and located outside the screw drive seat, both the reducer and the screw drive seat are fixedly connected to the mounting seat, and the mounting seat is fixedly connected to the inside of the base.

A laser cleaning device includes the laser cleaning device lens mentioned above.

The lens of the laser cleaning equipment and the laser cleaning equipment of the present invention have the beneficial effects of zooming and accurate imaging in a larger size, compact structure, small size and portability.

Description of drawings

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific implementation methods.

FIG. 1 is a schematic structural view of a lens of a laser cleaning device according to the present invention.

Fig. 2 is a schematic structural diagram of a laser cleaning equipment lens of the present invention after the lens housing is removed.

Fig. 3 is a schematic structural diagram of a lens focusing device in a lens of a laser cleaning device according to the present invention.

Fig. 4 is a limited coordinate system of the convex lens of the lens of a laser cleaning equipment according to the present invention.

In the figure: lens housing 1; base 2; chute 2-1; convex lens holder 3; vibrating mirror holder 4; laser sensor 5; lens focusing device 6; encoder 6-1; mounting base 6-2; Screw drive seat 6-3; Nut block 6-4; Screw rod 6-5; Motor 6-6; Reducer 6-7; Coupling Ⅰ 6-8; Coupling Ⅱ 6-9.

Detailed ways

1, 2, 3, 4 to illustrate this embodiment, the fixed connection described in this embodiment can be a common connection such as bolt connection or welding, which can be selected according to the actual situation.

A laser cleaning equipment lens of the present invention is composed of a lens housing 1, a base 2, a convex lens base 3, a vibrating mirror base 4, a laser sensor 5, and a lens focusing device 6 for changing the position of the convex lens base 3, which can be zoomed And accurate imaging in larger size, compact structure, small and portable.

The lens housing 1 is provided with a hole for the laser to pass through, and the lens housing 1 is fixedly connected to the upper end of the outer side of the base 2;

The upper surface of the base 2 is provided with a chute 2-1, the chute 2-1 runs through the upper surface of the base 2, the length of the chute 2-1 is less than the length of the base 2, that is, the The chute 2-1 does not completely span the base 2, and there is no chute 2-1 at one end of the base 2;

The convex lens holder 3 is slidably connected with the chute 2-1, so as to ensure that the convex lens holder 3 can slide in the chute 2-1, thereby adjusting the distance between the convex lens holder 3 and the vibrating mirror holder 4, That is to adjust the distance between the convex lens and the vibrating mirror. The lower end of the convex lens holder 3 is positioned at the inner side of the base 2 and is fixedly connected to the lens focusing device 6, and the lens focusing device 6 is fixedly connected to the inner side of the base 2; the lens focusing device 6 It can drive the convex lens holder 3 to slide in the slide groove 2-1 and fix the position of the convex lens holder 3, so as to adjust the distance between the convex lens and the vibrating mirror to realize zooming. For the cleaning of partial parts of large non-detachable equipment, the laser cleaning equipment is often fixed at a specific position for cleaning, and the cleaning platform cannot be moved. However, this device does not need a cleaning platform, and can be realized by moving the convex lens to zoom, and has a wide range of applications.

The vibrating mirror base 4 is fixedly connected to the upper end of the outer side of the base 2, and the laser sensor 5 is fixedly connected to the base 2;

A vibrating mirror is fixed on the vibrating mirror mirror seat 4, a convex lens is fixed on the convex lens mirror seat 3, and the convex lens mirror seat 3 is located at the output end of the vibrating mirror mirror seat 4 so that the laser passes through the vibrating mirror first and then through the convex lens. Moreover, the positional relationship between the convex lens base 3 and the vibrating mirror base 4 satisfies that the laser light passing through the vibrating mirror can be transmitted to the convex lens and irradiated to the object to be cleaned after passing through the convex lens.

The curved surface of the convex lens mirror satisfies the following equation,

Let S be the tangent plane of the convex lens, take the left plane of the convex lens as the Y axis, pass through the midpoint of the left plane and be the X axis perpendicular to the left plane, establish the limited coordinate system of the convex lens,

Assuming that any ray parallel to the X-axis intersects the convex lens at the point Px, y, the refractive index of the convex lens relative to air is n, and the ray parallel to the X-axis intersects the X-axis after being refracted by the convex lens At point c, the distance between the origin o of the limited coordinate system and point c is L, then

Among them, C is a constant. The tangent line of the tangent plane S of the convex lens passing through the point P at the point Px, y is marked as L1, and the normal line is marked as L2. At the same time, the angle between the incident ray and L2 is denoted as θ, and the angle between the refracted ray PC and L2 is

First, it can be known from the law of refraction:

Let the slope of L1 be k, and since L2 is perpendicular to L1, it is obtained that the slope of L2 is -1/k, and by tanθ=-1/k, formula 1 becomes:

At this time, we know OX=x, XP=y from the coordinate relationship, and let OC=L. At this time, we assume that L is a fixed value, and because of the arbitrariness of Px and y points, the equation about L to be obtained is expressed After any parallel light is incident, it will be deflected to the same point C due to refraction.

From the knowledge of plane geometry, we know that:

but Substitute into equation (2) to get:

n=(Lx)/(y2+(Lx) ² )1/2+(-k)*y/(y ² +(Lx) ² )1/2 (3)

because Substitute into equation (3) to simplify:

Based on the above content, it is obtained: under the premise that n>1, L>0, and n and L are both fixed values, the equation The corresponding convex lens can realize strict absolute convergence for parallel light.

Solve the equation mathematically:

And is a fixed value.

Ignoring L, 0, transform the equation form:

right Multiply the left and right sides by dx to get:

ndx=((Lx)dx-ydy)/(y ² +(Lx) ² )1/2

-ndx＝((xL)dx+ydy)/(y ² +(Lx) ² )1/2

＝(xL)dx/(y ² +(Lx) ² )1/2+ydy/(y ² +(Lx)2)1/2

＝d((y ² +(Lx) ² )1/2)

Integrate both sides at the same time:

-nx+C＝(y ² +(Lx) ² )1/2

That is, the equation that the convex lens section S should satisfy is:

-nx+C=(y ² +(Lx) ² )1/2, wherein L>0, n>1, and are constant values.

Taking this equation further, we get:

When C and L take appropriate values, this equation represents a hyperbola. At the same time, observing the form of the equation, it is concluded that there is a conversion factor of (n ² -1)1/2 between the length of the real axis and the length of the imaginary axis of the hyperbolic equation.

At the same time, from the properties of the hyperbola, the conversion coefficient can be obtained to represent the slope of the hyperbolic asymptote, and it can be further obtained: when n tends to infinity, the asymptote of the hyperbola will be close to the y-axis. Due to the reversibility of the light path, the light emitted from x=L to the left within a certain angle range with the X axis will be strictly converted into parallel light, and the range of this angle is between the two asymptotes The size of the included angle depends on this conversion factor. When n is large enough, almost all light rays emitted to the left space through this point will be strictly converted into parallel light.

Therefore, when the surface of a convex lens satisfies the equation:

At this time, it can solve the technical problem that Gaussian optics can only be accurately imaged in a small size due to the limitation of the paraxial condition, so that it can be accurately imaged in a large size, thus making the device compact and portable.

The lens focusing device 6 is composed of an encoder 6-1, a mount 6-2, a screw drive seat 6-3, a nut block 6-4, a screw 6-5, a motor 6-6, a reducer 6-7, Coupling I6-8 and coupling II6-9, the motor 6-6 is fixedly connected to the mounting seat 6-2, the output shaft of the motor 6-6 passes through the coupling I6- 8 is connected to the reducer 6-7, the output shaft of the reducer 6-7 is connected to the screw 6-5 through the coupling II 6-9, and the screw 6-5 is rotatably connected to the screw drive In the seat 6-3, the lower end of the nut block 6-4 is threadedly connected to the screw rod 6-5, the upper end of the nut block 6-4 is fixedly connected to the convex lens holder 3, and the encoder 6- 1 is fixedly connected to the screw 6-5 and located outside the screw drive seat 6-3, and the reducer 6-7 and the screw drive seat 6-3 are both fixedly connected to the mounting seat 6-2 , the mounting base 6-2 is fixedly connected to the inner side of the base 2. When the focal length needs to be adjusted, by controlling the rotation of the motor 6-6, the screw rod 6-5 is driven to rotate in the screw drive seat 6-3 after being decelerated by the reducer 6-7, thereby driving the nut block 6-4 to move left and right. The principle is The principle of screw drive. Encoder 6-1 selects the existing rotary encoder on the market to collect the rotational speed information at each moment, and performs PID control through computer processing to ensure the accuracy of the movement, and realize accurate control of the movement of the convex lens for zooming.

A laser cleaning device, comprising the above lens of the laser cleaning device.

The principle of a laser cleaning equipment lens and laser cleaning equipment is:

When the laser emitted by the existing laser generating equipment passes through the vibrating mirror, it will pass through the convex lens to irradiate the surface of the object to be cleaned. The existing laser cleaning principle is used to clean the surface of the object. When the surface of the object to be cleaned is uneven, it is necessary to continuously change the position of the convex lens according to the distance between the object surface and the convex lens to achieve zooming, so as to better clean the object surface. During the zooming process, the distance between the laser sensor 5 and the surface of the object is first measured by the laser sensor 5 and the position of the convex lens is initialized. According to the distance between the convex lens and the laser sensor 5 and the distance between the laser sensor 5 and the surface of the object during initialization The distance between the convex lens and the surface of the object is calculated by the computer. Then, the PID control is carried out by the computer to realize the precise zooming of the convex lens, and the different surfaces of the object are cleaned by using the zoomed laser, so that the surface of each part of the object can achieve a good cleaning effect.

Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or replacements made by those skilled in the art within the scope of the present invention also belong to the scope of the present invention. protected range.

Claims (4)

1. a kind of laser cleaning equipment camera lens, it is characterised in that：The laser cleaning equipment camera lens is by mirror head outer shell body (1), pedestal (2), convex lens microscope base (3), galvanometer microscope base (4), laser sensor (5) and the camera lens for changing convex lens microscope base (3) position Focus control (6) forms；

Be provided on the mirror head outer shell body (1) allow laser by hole, the mirror head outer shell body (1) is fixedly connected on the bottom The upper end in the outside of seat (2)；

The upper surface of the pedestal (2) is provided with sliding slot (2-1), and the sliding slot (2-1) runs through the upper surface of the pedestal (2), The length of the sliding slot (2-1) is less than the length of the pedestal (2)；

The convex lens microscope base (3) is slidably connected with the sliding slot (2-1), and the lower end of the convex lens microscope base (3) is positioned at described The inside of pedestal (2) is simultaneously fixedly connected on the lens focusing device (6), and the lens focusing device (6) is fixedly connected on The inside of the pedestal (2)；

The galvanometer microscope base (4) is fixedly connected on the upper end in the outside of the pedestal (2), and the laser sensor (5) is fixed to be connected It is connected on the pedestal (2)；

It is fixed with galvanometer on the galvanometer microscope base (4), convex lens, the convex lens mirror are fixed on the convex lens microscope base (3) The output end that seat (3) is located at the galvanometer microscope base (4) makes laser first pass through the galvanometer again by the convex lens.

2. a kind of laser cleaning equipment camera lens according to claim 1, it is characterised in that：The song of the convex lens minute surface Face meets following equation,

If S is the section of the convex lens, using the left side plane of the convex lens as Y-axis, by left side plane midpoint and vertically Left side plane is X-axis, establishes the restriction coordinate system of the convex lens,

Assuming that any one light for being parallel to X-axis is met at the convex lens at P (x, y) points, if the convex lens relative to The refractive index of air is n, and the light for being parallel to X-axis meets at c points after convex lens refraction with X-axis, limits coordinate system The distance between origin o and c points are L, then have

Wherein, C is constant.

3. a kind of laser cleaning equipment camera lens according to claim 2, it is characterised in that：The lens focusing device (6) by encoder (6-1), mounting base (6-2), screw drive seat (6-3), nut block (6-4), screw rod (6-5), motor (6- 6), retarder (6-7), shaft coupling I (6-8) and shaft coupling II (6-9) composition, the motor (6-6) are fixedly connected on described In mounting base (6-2), the output shaft of the motor (6-6) connects the retarder (6-7) by the shaft coupling I (6-8), The output shaft of the retarder (6-7) connects the screw rod (6-5) by the shaft coupling II (6-9), and the screw rod (6-5) turns Dynamic to be connected in the screw drive seat (6-3), the lower thread of the nut block (6-4) is connected on the screw rod (6-5), The upper end of the nut block (6-4) is fixedly connected with the convex lens microscope base (3), and the encoder (6-1) is fixedly connected on described Outside on screw rod (6-5) and positioned at the screw drive seat (6-3), the retarder (6-7) and screw drive seat (6-3) are equal It is fixedly connected in the mounting base (6-2), the mounting base (6-2) is fixedly connected on the inside of the pedestal (2).

4. a kind of laser cleaning equipment includes the laser cleaning equipment camera lens as described in any one of claims 1 to 3.