Temperature detection device and laser head

Abstract

The application discloses a temperature detection device and a laser head, the laser head comprises the temperature detection device, a focusing lens and a lifting mechanism, a fixed rod with a waist-shaped hole is arranged on the lifting mechanism, the temperature detection device can rotate relative to the shell of the laser head, a mounting frame of the temperature detection device is provided with a gap, a rotating shaft is arranged through the waist-shaped hole in the transverse direction, a roller is sleeved on the rotating shaft, the roller is in sliding contact with the inner walls of the two sides of the waist-shaped hole, a detection central axis of the temperature detection device intersects with a central axis of the focusing lens at a center point on the surface of the focusing lens, when the focusing lens is lifted by the lifting mechanism, the roller is pushed through the waist-shaped hole on the fixed rod to rotate the whole temperature detection device, and the detection central axis of the temperature detection device is always aligned with the center point on the surface of the focusing lens. The application can effectively improve the temperature measurement accuracy of the infrared temperature sensor on the focusing lens.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of laser cutting, in particular to a temperature detection device and a laser head. BACKGROUND

[0002] In the current high-power laser cutting field, with the continuous increase of the energy density through the lens of the laser head, the thermal effect component of the lens increases, the thermal effect of the lens of the laser head increases, and the influence on the laser beam quality and the laser focus after passing through the laser head also increases. Since the stability of the focus of the laser head is very important for the product quality and processing stability of laser processing, it is necessary to monitor the temperature of the focusing lens of the laser head to monitor its thermal effect, and then adjust the focus to enable the laser head to realize stable processing. However, the existing temperature sensor cannot accurately obtain the real-time temperature of the focusing lens when it is directly applied to the temperature monitoring of the lens of the laser head, and the reasons are as follows: 1. The temperature acquisition range of the existing temperature sensor is large, which will collect all the thermal radiation in front of it, and the detection error is large; 2. When focusing, the focusing lens in the laser head will change the fixed position by the lifting mechanism, and move vertically in a certain range in the light path direction, so during the temperature monitoring process, there is stray light reflection when the laser head is processing, which makes the heat source in the laser head complex, and also makes the real-time temperature detected by the temperature sensor have a large error. Therefore, there is an urgent need to design a device that can accurately measure the temperature in the laser head. SUMMARY

[0003] The present application provides a temperature detection device and a laser head, which can effectively reduce the detection angle of the infrared temperature sensor in the laser head, and make the detection central axis of the infrared temperature sensor always align with the surface center of the focusing lens when the focusing lens is lifted, so as to effectively improve the temperature measurement accuracy of the infrared temperature sensor on the focusing lens.

[0004] The technical scheme of the present application is as follows:

[0005] A temperature detection device, comprising an infrared temperature sensor and a mounting frame, the mounting frame is provided with a mounting cavity, the bottom of the mounting cavity is provided with a partition plate, the partition plate is provided with a cylindrical diaphragm hole, the infrared temperature sensor is installed in the mounting cavity, and the collection lens of the infrared temperature sensor corresponds to the diaphragm hole, and the area of the collection lens is larger than that of the diaphragm hole;

[0006] The center of the collection lens and the center of the diaphragm hole are on the same axis, and the axis is the detection central axis of the infrared temperature sensor;

[0007] When measuring, a conical temperature detection range is formed between the measured object and the diaphragm hole, and the heat of the measured object is radiated to the collection lens of the infrared temperature sensor through the diaphragm hole.

[0008] The cone angle of the conical temperature detection range is the detection angle of the temperature detection device, and the calculation formula of the detection angle is as follows:

[0009]

[0010] The transformation is as follows:

[0011]

[0012] In the formula, θ is the detection angle, h is the depth of the diaphragm hole, and d is the diameter of the diaphragm hole.

[0013] The application increases the diaphragm hole in front of the infrared temperature sensor, and the detection angle of the infrared temperature sensor is designed controllably. According to the depth and diameter of the designed diaphragm hole, the detection angle is controlled in a smaller space angle. Even if the infrared temperature sensor is aligned with the surface of the focusing lens to form an effective detection range, the temperature measurement error of the infrared temperature sensor can be effectively reduced.

[0014] Further, a sealing ring is arranged between the bottom of the partition plate and the bottom of the mounting cavity. The sealing ring is used to make the partition plate more stable, so as to ensure the stability of the diaphragm hole and improve the stability of temperature measurement.

[0015] Further, the top of the mounting cavity is provided with a fixing plate, the infrared temperature sensor is mounted in the mounting cavity, and the infrared temperature sensor is fixed through the fixing plate, so that the pins of the infrared temperature sensor are exposed to connect external control instruments.

[0016] Further, the mounting frame is integrally formed by heat insulation material. When the temperature detection device is installed in the laser head, the mounting frame formed by the heat insulation material can reduce the interference of heat radiation in the laser head on the infrared temperature sensor, and improve the accuracy of temperature measurement.

[0017] The application also provides a laser head comprising the above-mentioned temperature detection device, the laser head further comprising a focusing lens and a lifting mechanism for driving the focusing lens to vertically lift, the lifting mechanism being provided with a fixing rod, the fixing rod being provided with a waist-shaped hole, both sides of the mounting frame being symmetrically provided with fixing shafts, the fixing shafts being mounted in the inner wall of the shell of the laser head through bearings so that the mounting frame can rotate relative to the shell, one side of the mounting frame being provided with a connecting block, the connecting block being provided with a notch, the fixing rod being arranged in the notch, and a rotating shaft being arranged across the waist-shaped hole, a roller being sleeved on the rotating shaft and being in sliding contact with the inner walls of both sides of the waist-shaped hole.

[0018] The detection central axis of the infrared temperature sensor intersects with the central axis of the focusing lens at the center point of the surface of the focusing lens.

[0019] When the lifting mechanism drives the focusing lens to lift, the waist-shaped hole on the fixed rod is lifted synchronously, thereby pushing the roller to rotate the mounting frame, so that the detection central axis of the infrared temperature sensor always intersects with the central axis of the focusing lens at the center point of the focusing lens surface.

[0020] The laser head of the present application is provided with a structure for rotating the infrared temperature sensor to follow the movement of the focusing lens. When the focusing lens is lifted in the lifting stroke, the infrared temperature sensor can be rotated by a certain angle through the waist-shaped hole on the fixed rod, so that the detection central axis of the infrared temperature sensor always aims at the center of the focusing lens surface, which can effectively control the heat source of detection to come from the focusing lens only, thereby improving the temperature measurement accuracy of the focusing lens.

[0021] Further, the specific design process for making the detection central axis of the infrared temperature sensor always intersect with the central axis of the focusing lens at the center point of the focusing lens surface is as follows:

[0022] A reference plane perpendicular to the horizontal plane passes through the fixed shaft, the roller and the center point of the focusing lens surface, so that the section center point of the fixed shaft, the roller and the center point of the focusing lens surface are all on the reference plane. A two-dimensional coordinate system is established on the reference plane with the section center point A of the fixed shaft as the zero point. Since the lifting mechanism changes the position of the roller through the waist-shaped hole on the fixed rod, thereby rotating the mounting frame;

[0023] Therefore, when the lifting mechanism is at the lower limit of the stroke, the section center point of the roller is set as point B, and the center point of the focusing lens surface at this time is set as point E, and a lower limit horizontal plane is formed at the height of point E. A perpendicular line is drawn from point A to intersect with the lower limit horizontal plane at point G, that is, AG is the vertical height of point A to the center point of the focusing lens at the lower limit of the stroke. At this time, triangle AGE is a right triangle, and AE is the detection central axis of the infrared temperature sensor to the center point of the focusing lens surface at the lower limit of the stroke.

[0024] When the lifting mechanism is at the upper limit of the stroke, the section center point of the roller is set as point C, and the center point of the focusing lens surface at this time is set as point D, and an upper limit horizontal plane is formed at the height of point D. A perpendicular line is drawn from point A to intersect with the upper limit horizontal plane at point F, that is, AF is the vertical height of point A to the center point of the focusing lens at the upper limit of the stroke. At this time, triangle AFD is a right triangle, and AD is the detection central axis of the infrared temperature sensor to the center point of the focusing lens surface at the upper limit of the stroke.

[0025] Since the focusing lens only changes the height during lifting, AF and AG are on the same perpendicular line, and point D and point E are also on the same perpendicular line, that is, FD=GE.

[0026] Therefore, when the lifting mechanism drives the focusing lens to lift in the lifting stroke, the angle range of the rotating of the mounting frame by synchronously pushing the rollers through the waist-shaped hole on the fixed rod is ∠FAD-∠GAE;

[0027] Therefore, the angle range is ω, FD=GE=K, AF=Y1, AG=Y2, and the lifting stroke is X, i.e. X=Y2-Y1;

[0028] Therefore, the relationship of the angle range ω is as follows:

[0029]

[0030]

[0031]

[0032]

[0033]

[0034] The relationship of the lifting stroke X is as follows:

[0035] K=Y2tan∠GAE=Y1tan∠FAD

[0036] X=Y2-Y1

[0037]

[0038] Since the upper limit position and the lower limit position of the focusing lens and the mounting position of the fixed shaft are determined in the design of the laser head, the values of Y2, Y1 and K can be determined by measurement, and then the angle range ω is calculated, and the radian of the moving arc of the roller is calculated according to the angle range ω, and the shape of the waist-shaped hole is designed according to the radian, so that when the lifting mechanism drives the focusing lens to lift, the detection central axis of the infrared temperature sensor always intersects with the central axis of the focusing lens at the center point of the surface of the focusing lens.

[0039] The mounting position of the infrared temperature sensor is designed from the perspective of geometry, so that the infrared temperature sensor can always rotate to follow the movement of the focusing lens in the stroke range, and the detection central axis always aligns with the surface center point of the focusing lens, so that the heat source of the detection is only from the focusing lens, the problem of complex heat source in the current laser head is effectively solved, and the accuracy of the infrared temperature sensor in temperature measurement of the focusing lens is improved.

[0040] Further, the lifting mechanism comprises a motor, a screw rod fixing seat, a screw rod, a screw rod nut and a sliding block.

[0041] The motor is connected with one end of the screw rod through a shaft coupling, the screw rod is fixed in the laser head through the screw rod fixing seat, the screw rod nut is threadedly sleeved on the screw rod, one side of the sliding block is fixedly connected with the screw rod nut, and the other side of the sliding block is fixedly connected with the focusing lens.

[0042] When the focusing lens is lifted, the motor is started, the motor drives the screw rod to rotate through the shaft coupling, the screw rod nut is linearly moved on the screw rod, and the focusing lens is vertically lifted through the sliding block.

[0043] Further, the focusing lens is fixedly connected with the sliding block through a metal base, and the focusing lens is arranged in a fixing cavity formed in the middle of the metal base.

[0044] Further, the bottom of the fixing rod is provided with a positioning groove, and the top of the sliding block is provided with a positioning protrusion matched with the positioning groove.

[0045] The cooperation of the positioning protrusion and the positioning groove can quickly position the fixing rod on the top of the sliding block, thereby improving the installation efficiency.

[0046] Further, the bottom of the fixing rod is provided with a mounting base, the mounting base is provided with the positioning groove, and both sides of the mounting base are provided with fixing screw holes. After the fixing rod is positioned and inserted into the positioning protrusion on the sliding block through the positioning groove, the fixing rod is locked on the top of the sliding block through bolts, so that the fixing rod is convenient to maintain and replace.

[0047] The beneficial effects of the present application are as follows:

[0048] The present application increases an aperture stop hole in front of the infrared temperature sensor, the aperture stop hole makes the infrared temperature sensor only collect temperature data in a detection angle formed by the aperture of the aperture stop hole, and the temperature measurement error of the infrared temperature sensor can be effectively reduced. BRIEF DESCRIPTION OF DRAWINGS

[0049] Figure 1 is a structural schematic view of a temperature detection device installed on a lifting mechanism;

[0050] Figure 2is a structural schematic diagram of a temperature detection device;

[0051] Figure 3 is a schematic diagram of the temperature detection device and the lifting mechanism installed inside the laser head;

[0052] Figure 4 is Figure 1 another perspective schematic diagram of

[0053] Figure 5 is Figure 4 A-A sectional view of

[0054] Figure 6 is an enlarged schematic diagram of B part in Figure 5

[0055] Figure 7 is a schematic diagram of the principle of calculating the detection angle;

[0056] Figure 8 is a rotating schematic diagram of the infrared temperature sensor when the focusing lens is lifted;

[0057] Figure 9 is a schematic diagram of the geometric relationship between the rotation angle of the infrared temperature sensor and the stroke conversion of the focusing lens.

[0058] In the figure: infrared temperature sensor 1, mounting frame 2, connecting block 201, notch 202, partition 3, diaphragm hole 301, focusing lens 4, fixed rod 5, waist-shaped hole 501, positioning groove 502, fixed shaft 6, roller 7, motor 8, screw rod fixed seat 9, screw rod 10, screw rod nut 11, sliding block 12, coupling 13, metal base 14, sealing ring 15, fixed plate 16, positioning protrusion 17, mounting base 18. DETAILED DESCRIPTION

[0059] The accompanying drawings are only used for illustrative description and cannot be understood as a limitation of the patent; in order to better illustrate the embodiment, some components in the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. The positional relationship described in the drawings is only used for illustrative description and cannot be understood as a limitation of the patent.

[0060] Example 1:

[0061] As Figures 1-6 ​As shown, this embodiment provides a temperature detection device and a laser head. The temperature detection device includes an infrared temperature sensor 1 and a mounting frame 2. The mounting frame 2 has a mounting cavity, and a partition 3 is provided at the bottom of the mounting cavity. The partition 3 has a cylindrical aperture 301. The infrared temperature sensor 1 is installed in the mounting cavity, and the collecting lens of the infrared temperature sensor 1 corresponds to the aperture 301. The area of ​​the collecting lens is larger than the area of ​​the aperture 301. The center of the collecting lens and the center of the aperture 301 are on the same axis, and this axis is the detection axis of the infrared temperature sensor 1.

[0062] The laser head is equipped with the aforementioned temperature detection device, as well as a focusing lens 4 and a lifting mechanism for vertically raising and lowering the focusing lens 4. The lifting mechanism is equipped with a fixed rod 5, which has an oblong hole 501. Fixed shafts 6 are symmetrically arranged on both sides of the mounting frame 2. The fixed shafts 6 are mounted on the inner wall of the laser head housing via bearings so that the mounting frame 2 can rotate relative to the housing. A connecting block 201 is provided on one side of the mounting frame 2. The connecting block 201 has a notch 202. The fixed rod 5 is placed in the notch 201, and a rotating shaft is horizontally arranged in the notch 201, passing through the oblong hole 501. A roller 7 is sleeved on the rotating shaft, and the roller 7 slides in contact with the inner walls on both sides of the oblong hole 501.

[0063] The detection axis of the infrared temperature sensor 1 intersects with the central axis of the focusing lens 4 at the center point of the surface of the focusing lens 4. When the lifting mechanism drives the focusing lens 4 to rise or fall, the waist-shaped hole 501 on the fixed rod 5 rises or falls synchronously, thereby pushing the roller 7 to rotate the mounting bracket 2, so that the detection axis of the infrared temperature sensor 1 always intersects with the central axis of the focusing lens 4 at the center point of the surface of the focusing lens 4.

[0064] like Figure 7 As shown, when the infrared temperature sensor 1 measures the temperature of the focusing lens 4, a conical temperature detection range is formed between the focusing lens 4 and the aperture 301. The heat of the focusing lens 4 is radiated to the acquisition lens of the infrared temperature sensor 1 through the aperture 301 to achieve temperature measurement.

[0065] The cone angle of the conical temperature detection range is the detection angle of the temperature detection device, and the formula for calculating the detection angle is as follows:

[0066]

[0067] The transformation yields:

[0068]

[0069] In the formula, θ is the detection angle, h is the depth of the aperture 301, and d is the diameter of the aperture 301.

[0070] The application increases the diaphragm hole 301 in front of the infrared temperature sensor 1, and the detection angle of the infrared temperature sensor 1 is designed controllably, the detection angle is controlled in a smaller space angle according to the depth and diameter of the designed diaphragm hole 301, that is, the infrared temperature sensor 1 forms an effective detection range to the surface of the focusing lens 4, and the temperature measurement error of the infrared temperature sensor 1 can be effectively reduced. The application is provided with a structure for rotating the infrared temperature sensor 1 to follow the focusing lens 4 when the focusing lens 4 is lifted in the lifting stroke, and the infrared temperature sensor 1 can be rotated by a certain angle through the waist-shaped hole 501 on the fixed rod 5, so that the detection central axis of the infrared temperature sensor 1 is always aligned with the center of the surface of the focusing lens 4, the heat source of the detection can be effectively controlled to come from the focusing lens 4 only, and the temperature measurement accuracy of the focusing lens 4 is improved.

[0071] In the embodiment, the model of the infrared temperature sensor 1 is MLX90614, and the collection lens for collecting temperature is circular with a diameter of 5.5 mm.

[0072] As shown in Figure 8 and Figure 9 , the specific design process that the detection central axis of the infrared temperature sensor 1 is always intersected with the central axis of the focusing lens 4 at the center point of the surface of the focusing lens 4 is as follows:

[0073] A reference plane perpendicular to the horizontal plane passes through the fixed shaft 6, the roller 7 and the center point of the surface of the focusing lens 4, so that the section center point of the fixed shaft 6, the roller 7 and the center point of the surface of the focusing lens 4 are all on the reference plane, and a two-dimensional coordinate system is established on the reference plane with the section center point A of the fixed shaft 6 as the zero point, since the lifting mechanism changes the position of the roller 7 through the waist-shaped hole 501 on the fixed rod 5, and then the mounting frame 2 rotates;

[0074] Therefore, when the lifting mechanism is at the lower limit of the stroke, the section center point of the roller 7 is set as point B, and the center point of the surface of the focusing lens 4 is set as point E at this time, and a lower limit horizontal plane is formed at the height of point E, a vertical line is drawn from point A to intersect with the lower limit horizontal plane at point G, that is, AG is the vertical height of point A to the center point of the focusing lens 4 at the lower limit of the stroke, at this time, △AGE is a right triangle, and AE is the detection central axis of the infrared temperature sensor 1 to the center point of the surface of the focusing lens 4 at the lower limit of the stroke;

[0075] When the lifting mechanism is at the upper limit of the stroke, the cross-section center point of the roller 7 is set as point C, and the center point of the surface of the focusing lens 4 at this time is set as point D, and an upper limit horizontal plane is formed at the height of point D, a vertical line is drawn from point A to intersect the upper limit horizontal plane at point F, i.e. AF is the vertical height from point A to the center point of the focusing lens 4 at the upper limit of the stroke, at this time △AFD is a right triangle, and AD is the detection central axis from the infrared temperature sensor 1 to the center point of the surface of the focusing lens 4 at the upper limit of the stroke;

[0076] Since the lifting of the focusing lens 4 only changes the height, AF and AG are on the same vertical line, and point D and point E are also on the same vertical line, i.e. FD = GE;

[0077] Therefore, when the lifting mechanism drives the focusing lens 4 to lift within the lifting stroke, the angle range of the synchronous rotation of the mounting frame 2 by the waist-shaped hole 501 on the fixed rod 5 to push the roller 7 is ∠FAD-∠GAE;

[0078] Therefore, the angle range is set as ω, FD = GE = K, AF = Y1, AG = Y2, and the lifting stroke is set as X, i.e. X = Y2-Y1;

[0079] Therefore, the relationship of the angle range ω is as follows;

[0080]

[0081]

[0082]

[0083]

[0084]

[0085] The relationship of the lifting stroke X is as follows;

[0086] K = Y2tan∠GAE = Y1tan∠FAD

[0087] X = Y2-Y1

[0088]

[0089] Since the upper limit position and the lower limit position of the focusing lens 4 and the installation position of the fixed shaft 6 are determined in advance when the laser head is designed, the values of Y2, Y1 and K can be determined by measurement, and then the angle range ω is calculated, and the radian of the moving arc of the roller 7 is calculated according to the angle range ω, and the shape of the waist-shaped hole 501 is designed according to the radian, so that when the lifting mechanism drives the focusing lens 4 to move up and down, the detection central axis of the infrared temperature sensor 1 always intersects with the central axis of the focusing lens 4 at the center point on the surface of the focusing lens 4.

[0090] The installation position of the infrared temperature sensor 1 is designed from the perspective of geometry, so that the infrared temperature sensor 1 can always rotate with the movement of the focusing lens 4 within the stroke range, and the detection central axis is always aligned with the center point on the surface of the focusing lens 4, so that the heat source detected can only come from the focusing lens 4, effectively solving the problem of complex heat source in the current laser head, and improving the accuracy of the infrared temperature sensor 1 in temperature measurement of the focusing lens 4.

[0091] Referring to Figure 1 and Figure 3 In this embodiment, the lifting mechanism includes a motor 8, a screw rod fixing seat 9, a screw rod 10, a screw rod nut 11 and a sliding block 12.

[0092] The motor 8 is connected to one end of the screw rod 10 through a shaft coupling 13, the screw rod 10 is fixed in the laser head through the screw rod fixing seat 9, the screw rod nut 11 is threadedly sleeved on the screw rod 10, one side of the sliding block 12 is fixedly connected with the screw rod nut 11, and the other side of the sliding block 12 is fixedly connected with the focusing lens 4.

[0093] When the focusing lens 4 is lifted, the motor 8 is started, the motor 8 drives the screw rod 10 to rotate through the shaft coupling 13, so that the screw rod nut 11 moves linearly on the screw rod 10, and the screw rod nut 11 drives the focusing lens 4 to move vertically through the sliding block 12.

[0094] In this embodiment, the focusing lens 4 is fixedly connected with the sliding block 12 through a metal base 14, and the focusing lens 4 is arranged in a fixing cavity formed in the middle of the metal base 14.

[0095] Similarly, the focusing lens 4 in this embodiment can be replaced by a collimating lens, which is used to detect the temperature of the collimating lens through the temperature detection device, and the center point of the collimating lens is always aligned with the detection central axis of the temperature detection device under the driving of the lifting mechanism. The design principle of the present application can also be applied to other objects that need to be measured.

[0096] The present application adds an aperture 301 in front of the infrared temperature sensor 1, which makes the infrared temperature sensor 1 only collect temperature data in the detection angle formed by the aperture diameter of the aperture 301, so as to effectively reduce the temperature measurement error of the infrared temperature sensor 1; at the same time, through the geometric design of the installation position of the infrared temperature sensor 1 and the upper and lower limits of the lifting mechanism, the infrared temperature sensor 1 can effectively rotate synchronously with the focusing lens 4, so as to make the temperature collection area of the infrared temperature sensor 1 change synchronously with the position of the focusing lens 4, and always ensure that the detection central axis is aligned with the center of the focusing lens 4, thereby further improving the accuracy of the infrared temperature sensor 1 in temperature measurement of the focusing lens 4.

[0097] Embodiment 2:

[0098] Referring to Figure 6 , the present embodiment is similar to embodiment 1, and the difference is that in the present embodiment, a sealing ring 15 is arranged between the bottom of the partition plate 3 and the bottom of the installation cavity. The sealing ring 15 is used to make the partition plate 3 more stable, so as to ensure the stability of the position of the aperture 301 and improve the stability of temperature measurement.

[0099] Referring to Figure 1 and Figure 6 , in the present embodiment, the top of the installation cavity is provided with a fixed plate 16, the infrared temperature sensor 1 is installed in the installation cavity, and is fixed through the fixed plate 16, so that the pins of the infrared temperature sensor 1 are exposed to connect the external control instrument.

[0100] In the present embodiment, the mounting frame 2 is integrally formed by a heat insulation material. When the temperature detection device is installed in the laser head, the mounting frame 2 formed by the heat insulation material can reduce the interference of the heat radiation in the laser head on the infrared temperature sensor 1, and improve the accuracy of temperature measurement.

[0101] Embodiment 3:

[0102] Referring to Figure 5 , the present embodiment is similar to embodiment 1, and the difference is that in the present embodiment, the bottom of the fixed rod 5 of the laser head is provided with a positioning groove 502, and the top of the sliding block 12 is provided with a positioning protrusion 17 matched with the positioning groove 502. The cooperation of the positioning protrusion 17 and the positioning groove 502 can make the fixed rod 5 quickly positioned and installed on the top of the sliding block 12, and improve the installation efficiency.

[0103] Referring to Figure 1 , in the present embodiment, the bottom of the fixed rod 5 is provided with a mounting base 18, the mounting base 18 is provided with the positioning groove 502, and the two sides of the mounting base 18 are provided with fixed screw holes. After the fixed rod 5 is positioned and inserted with the positioning protrusion 17 on the sliding block 12 through the positioning groove 502, the fixed rod 5 is locked on the top of the sliding block 12 by using bolts, which is convenient for later maintenance and replacement.

[0104] Obviously, the above-mentioned embodiments of the present application are only examples for clearly explaining the present application, and are not intended to limit the embodiments of the present application. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, it is not necessary and impossible to exhaust all the embodiments. Any modification, equivalent replacement and improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the claims of the present application.

Claims

1. A laser head, characterized by The temperature detection device comprises an infrared temperature sensor (1), a mounting frame (2) provided with a mounting cavity, and a partition plate (3) provided at the bottom of the mounting cavity and provided with a cylindrical diaphragm hole (301); the infrared temperature sensor (1) is mounted in the mounting cavity, and the collection lens of the infrared temperature sensor (1) corresponds to the diaphragm hole (301); the area of the collection lens is larger than that of the diaphragm hole (301); the center of the collection lens is on the same axis as the center of the diaphragm hole (301), and the axis is the detection central axis of the infrared temperature sensor (1); when measuring, a conical temperature detection range is formed between the measured object and the diaphragm hole (301), and the heat of the measured object is radiated to the collection lens of the infrared temperature sensor (1) through the diaphragm hole (301); the cone angle of the conical temperature detection range is the detection angle of the temperature detection device, and the calculation formula of the detection angle is as follows: wherein θ is the detection angle, h is the depth of the diaphragm hole (301), and d is the diameter of the diaphragm hole (301); the laser head is further provided with a focusing lens (4) and a lifting mechanism for driving the focusing lens (4) to vertically lift; the lifting mechanism is provided with a fixed rod (5) provided with a waist-shaped hole (501); the mounting frame (2) is symmetrically provided with a fixed shaft (6) mounted on the inner wall of the shell of the laser head through a bearing so that the mounting frame (2) can rotate relative to the shell; one side of the mounting frame (2) is provided with a connecting block (201) provided with a notch (202); the fixed rod (5) is arranged in the notch (202), and a rotating shaft is arranged through the waist-shaped hole (501) in the transverse direction of the notch (202); a roller (7) is sleeved on the rotating shaft and in sliding contact with the inner walls of the waist-shaped hole (501) on both sides; the detection central axis of the infrared temperature sensor (1) intersects with the central axis of the focusing lens (4) at the center point on the surface of the focusing lens (4); when the lifting mechanism drives the focusing lens (4) to lift, the waist-shaped hole (501) on the fixed rod (5) synchronously lifts, thereby pushing the roller (7) to rotate the mounting frame (2), so that the detection central axis of the infrared temperature sensor (1) always intersects with the central axis of the focusing lens (4) at the center point on the surface of the focusing lens (4). a sealing ring (15) is arranged between the bottom of the partition plate (3) and the bottom of the mounting cavity.

2. A laser head as claimed in claim 1, characterized in that a fixed plate (16) is arranged at the top of the mounting cavity; the infrared temperature sensor (1) is mounted in the mounting cavity and fixed through the fixed plate (16), so that the pins of the infrared temperature sensor (1) are exposed to connect external control instruments.

3. The laser head of claim 1, wherein the mounting frame (2) is integrally formed by a heat insulation material.

4. The laser head of claim 1, wherein ​ 5. The laser head of claim 1, wherein The specific design process of making the detection central axis of the infrared temperature sensor (1) always intersect with the central axis of the focusing lens (4) at the center point of the surface of the focusing lens (4) is as follows: A reference plane perpendicular to the horizontal plane is passed through the fixed shaft (6), the roller (7) and the center point of the surface of the focusing lens (4), so that the section center point of the fixed shaft (6), the section center point of the roller (7) and the center point of the surface of the focusing lens (4) are all on the reference plane, and a two-dimensional coordinate system is established on the reference plane with the section center point A of the fixed shaft (6) as the zero point; When the lifting mechanism is at the lower limit of the stroke, the section center point of the roller (7) is set as B, and the center point of the surface of the focusing lens (4) at this time is set as point E, and a lower limit horizontal plane is formed at the height of point E, and a vertical line is drawn from point A to intersect the lower limit horizontal plane at point G, that is, AG is the vertical height of point A to the center point of the focusing lens (4) when the lifting mechanism is at the lower limit of the stroke, and at this time, △AGE is a right triangle, and AE is the detection central axis of the infrared temperature sensor (1) to the center point of the surface of the focusing lens (4) when the lifting mechanism is at the lower limit of the stroke; When the lifting mechanism is at the upper limit of the stroke, the section center point of the roller (7) is set as C, and the center point of the surface of the focusing lens (4) at this time is set as point D, and an upper limit horizontal plane is formed at the height of point D, and a vertical line is drawn from point A to intersect the upper limit horizontal plane at point F, that is, AF is the vertical height of point A to the center point of the focusing lens (4) when the lifting mechanism is at the upper limit of the stroke, and at this time, △AFD is a right triangle, and AD is the detection central axis of the infrared temperature sensor (1) to the center point of the surface of the focusing lens (4) when the lifting mechanism is at the upper limit of the stroke; Since the focusing lens (4) only changes the height during lifting, AF and AG are on the same vertical line, and point D and point E are also on the same vertical line, that is, FD=GE; Therefore, when the lifting mechanism drives the focusing lens (4) to lift within the lifting stroke, the waist-shaped hole (501) on the fixed rod (5) synchronously pushes the roller (7) to make the mounting frame (2) rotate within an angle range of ∠FAD-∠GAE; Therefore, the angle range is set as ω, FD=GE=K, AF=Y1, AG=Y2, and the lifting stroke is set as X, that is, X=Y2-Y1; Therefore, the relationship of the angle range ω is as follows: The relationship of the lifting stroke X is as follows: K=Y2tan∠GAE=Y1tan∠FAD X=Y2-Y1 After the upper limit position and the lower limit position of the focusing lens (4) and the mounting position of the fixed shaft (6) are determined, the values of Y2, Y1 and K are obtained, the angle range ω is calculated, the radian of the moving arc of the roller (7) is calculated according to the angle range ω, and the shape of the waist-shaped hole (501) is designed according to the radian, so that the detection central axis of the infrared temperature sensor (1) always intersects with the central axis of the focusing lens (4) at the center point of the surface of the focusing lens (4) when the lifting mechanism drives the focusing lens (4) to lift.

6. The laser head of claim 1, wherein The lifting mechanism comprises a motor (8), a screw rod fixing seat (9), a screw rod (10), a screw rod nut (11), and a sliding block (12); The motor (8) is connected with one end of the screw rod (10) through a shaft coupling (13), the screw rod (10) is fixed in the laser head through the screw rod fixing seat (9), the screw rod nut (11) is threadedly sleeved on the screw rod (10), one side of the sliding block (12) is fixedly connected with the screw rod nut (11), the other side of the sliding block (12) is fixedly connected with the focusing lens (4), and the fixing rod (5) is installed on the top of the sliding block (12).

7. The laser head of claim 6, wherein The focusing lens (4) is fixedly connected with the sliding block (12) through a metal base (14), and the focusing lens (4) is arranged in a fixing cavity formed in the middle of the metal base (14).

8. The laser head of claim 7, wherein the laser head is configured to be mounted on a robot arm. The bottom of the fixing rod (5) is provided with a positioning groove (502), and the top of the sliding block (12) is provided with a positioning protrusion (17) matched with the positioning groove (502).

9. The laser head of claim 8, wherein, The bottom of the fixing rod (5) is provided with a mounting base (18), the mounting base (18) is provided with the positioning groove (502), and both sides of the mounting base (18) are provided with fixing screw holes.

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