A laser cutting machine special for container door frame

Abstract

The application belongs to the technical field of metal processing, and discloses a special laser cutting machine for container door frames, which comprises a rotating seat, the surface of the rotating seat is movably sleeved with a shell, a plurality of heat dissipation fins are fixedly installed on the outer curved surface of the shell at equal intervals, a guide groove is formed in the inner curved surface of the shell, a plurality of first installation grooves are formed on the upper surface of the rotating seat at equal intervals, a plurality of first condenser lenses are fixedly sleeved on the middle portions of the first installation grooves, and the shell, the heat dissipation fins and the first condenser lenses are all made of a heat conduction material with a heat conduction coefficient not lower than 300 W / m·K. The first condenser lenses with different focal lengths are used to alternately collect the light generated by the laser above, so that the multiple high-temperature light spots formed on the focal line under the middle axis of the second installation sleeve of the polarizing lens move up and down at high speed, and the multiple high-temperature light spots form a high-temperature cutting line, thereby solving the problem that the cutting temperature of the existing laser cutting device is not uniformly collected, and the cutting surface is not flat.

Description

Technical Field

[0001] This invention belongs to the field of metal processing technology, specifically a laser cutting machine for container door frames. Background Technology

[0002] Laser cutting is a technology that uses a high-power-density laser beam to locally heat, melt, or vaporize materials, thereby achieving precise cutting. It is widely used in many fields such as metal processing, automotive industry, aerospace, and medical equipment.

[0003] However, existing laser cutting equipment faces many challenges when processing thick, high-temperature resistant materials, mainly in terms of cutting efficiency and cutting quality. Traditional methods typically place the concentrated high-temperature laser spot in the middle of the material's thickness. While this method can increase the cutting depth to some extent, the slow heat conduction from the middle to the upper and lower surfaces results in slow heat accumulation on the upper and lower surfaces, leading to low cutting efficiency. In addition, to address the problem of uneven heat transfer, a common approach is to increase the laser's power consumption to improve output energy. However, this often results in uneven heating in the middle and on the upper and lower surfaces of the material, causing significant deformation of the cut surface and ultimately reducing product quality and precision. Summary of the Invention

[0004] The purpose of this invention is to provide a laser cutting machine specifically for container door frames to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a laser cutting machine for container door frames, comprising a rotating base, a housing movably fitted onto the curved surface of the rotating base, multiple heat sinks fixedly installed at equal intervals on the outer circumference of the outer curved surface of the housing, a guide groove formed on the inner curved surface of the housing, multiple first mounting grooves formed at equal intervals on the upper circumference of the rotating base, multiple first focusing lenses fixedly fitted at the center of each of the multiple first mounting grooves, the focal length of the multiple first focusing lenses increasing at equal intervals along a clockwise direction, a mounting shell slidably provided on the upper surface of the rotating base, the mounting shell fixedly fitted onto the upper part of the inner curved surface of the housing, multiple mounting holes symmetrically formed on the upper surface of the mounting shell, a laser fixedly fitted at the center of each of the multiple mounting holes, a reflective coating provided on the inner side of the mounting shell, a driving mechanism provided at the center between the rotating base and the mounting shell, a spindle mechanism provided at the center of the driving mechanism, multiple focusing mechanisms provided between the inner curved surface of the housing and the spindle mechanism, and a lens mechanism fixedly fitted onto the bottom of the housing.

[0006] Preferably, the driving mechanism includes a protective shell, which is fixedly installed in the middle of the upper surface of the mounting shell. A driving seat is fixedly sleeved on the upper part of the inner curved surface of the protective shell. A driving shaft is movably sleeved in the middle of the mounting shell. The bottom end of the driving shaft is fixedly connected to the middle of the upper surface of the rotating seat. A first driving member is fixedly installed in the middle of the upper surface of the mounting shell. The driving shaft is fixedly sleeved in the middle of the output shaft of the first driving member. A second driving member is fixedly installed on the upper surface of the driving seat. A connecting shaft is fixedly installed at the output end of the second driving member. The connecting shaft is movably sleeved with the driving seat and slidably sleeved with the rotating seat and the driving shaft. The connecting shaft is clearance-fitted with the rotating seat and the driving shaft.

[0007] Preferably, the spindle mechanism includes a first threaded rod, which is fixedly installed at the bottom end of the connecting shaft. A second threaded rod is fixedly installed at the bottom end of the connecting shaft. A third threaded rod is fixedly installed at the bottom end of the second threaded rod. A fourth threaded rod is fixedly installed at the bottom end of the third threaded rod.

[0008] Preferably, the focusing mechanism includes a first mounting sleeve, a second condenser lens is fixedly sleeved in the middle of the first mounting sleeve, a threaded sleeve is fixedly installed on the side of the first mounting sleeve near the main shaft mechanism, the threaded sleeve is threadedly connected to the main shaft mechanism, and a slider is fixedly installed on the side of the first mounting sleeve away from the main shaft mechanism, the slider is slidably sleeved with its adjacent guide groove.

[0009] Preferably, the lens mechanism includes a second mounting sleeve, which is fixedly fitted onto the bottom of the housing. A partition sleeve is fixedly installed in the middle of the second mounting sleeve. A plurality of second mounting slots are symmetrically opened on the upper surface of the partition sleeve, and a polarizing lens is fixedly installed in the middle of the plurality of second mounting slots.

[0010] Preferably, the outer shell, heat sink, and rotating base are made of a thermally conductive material with a thermal conductivity of not less than 300 W / m·K.

[0011] Preferably, the first threaded rod and the fourth threaded rod have opposite thread directions and the same pitch, the second threaded rod and the third threaded rod have opposite thread directions and the same pitch, and the pitch of the first threaded rod is twice the pitch of the second threaded rod.

[0012] Preferably, the uppermost focusing mechanism is threadedly connected to the first threaded rod, the lowermost focusing mechanism is threadedly connected to the fourth threaded rod, and the two middle focusing mechanisms are threadedly connected to the second and third threaded rods respectively from top to bottom.

[0013] Preferably, when the main shaft mechanism rotates in the forward direction, the first threaded rod and the fourth threaded rod respectively drive the upper and lower focusing mechanisms to move towards each other, and the second threaded rod and the third threaded rod respectively drive the two middle focusing mechanisms that are threaded to them to move towards each other. The moving speed of the upper and lower focusing mechanisms is twice the moving speed of the two middle focusing mechanisms. Similarly, when the main shaft mechanism rotates in the reverse direction, the multiple focusing mechanisms move away from each other.

[0014] Preferably, the second mounting sleeve and the partition sleeve are made of a thermally conductive material with a thermal conductivity of not less than 300 W / m·K.

[0015] The beneficial effects disclosed in this invention are as follows:

[0016] 1. This invention, by setting up multiple lasers and multiple first focusing lenses with different focal lengths, multiple focusing mechanisms with the same focal length, and multiple polarizing lenses with the same focal length, causes the lasers generated by the multiple lasers to form multiple equidistant high-temperature light spots on the central axis of the second mounting sleeve below the polarizing lenses. Then, the drive mechanism is activated, causing the rotating base to rotate at high speed. The rotating base then causes the multiple first focusing lenses to rotate at high speed. Since the focal lengths of the multiple first focusing lenses increase equidistantly in a clockwise direction, the first focusing lenses with different focal lengths alternately focus the light generated by the lasers above them, resulting in the final... Multiple high-temperature light spots, focused on the central axis of the second mounting sleeve below the polarizing lens, move alternately and at high speed, forming a high-temperature cutting line. This allows the light generated by multiple lasers to be focused simultaneously, enabling the cutting of high-temperature resistant materials. This overcomes the problems of existing laser cutting devices that, when cutting thick plates, place the focused high-temperature light spots in the middle of the plate's thickness, resulting in slow heat accumulation on the upper and lower surfaces and low cutting efficiency, or that increase laser power consumption, causing uneven heating in the middle and upper parts of the plate, leading to large deformation of the cut surface.

[0017] 2. This invention utilizes a forward-starting drive mechanism, which rotates the main shaft mechanism. The main shaft mechanism drives the uppermost and lowermost focusing mechanisms, which are threadedly connected to it, to move towards each other. Simultaneously, the main shaft mechanism drives the two middle focusing mechanisms, which are threadedly connected to it, to move towards each other. This shortens the distance between the multiple focusing mechanisms, thereby reducing the length of the high-temperature cutting line moving along the central axis of the second mounting sleeve below the polarizing lens. This increases the heat accumulated per unit time, enabling efficient cutting of thin, high-temperature resistant plates. Similarly, by reversing the start of the drive mechanism, the length of the high-temperature cutting line moving along the central axis of the second mounting sleeve below the polarizing lens is increased, enabling efficient cutting of thick, low-melting-point plates. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments of this disclosure will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this disclosure and these drawings without any creative effort.

[0019] Figure 1 This is a schematic diagram of the overall appearance and structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the outer shell structure of the present invention;

[0021] Figure 3 This is a schematic diagram of the mounting shell structure of the present invention;

[0022] Figure 4 This is a schematic diagram of the drive mechanism structure of the present invention;

[0023] Figure 5 This is a schematic diagram of the focusing mechanism of the present invention;

[0024] Figure 6 This is a schematic diagram of the lens mechanism structure of the present invention.

[0025] In the diagram: 1. Rotary base; 101. First mounting slot; 2. Housing; 201. Heat sink; 202. Guide slot; 3. First condenser lens; 4. Mounting shell; 401. Mounting hole; 5. Laser; 6. Drive mechanism; 601. Protective shell; 602. Drive base; 603. Drive shaft; 604. First drive component; 605. Second drive component; 606. Connecting shaft; 7. Main shaft mechanism; 701. First threaded rod; 702. Second threaded rod; 703. Third threaded rod; 704. Fourth threaded rod; 8. Focusing mechanism; 801. First mounting sleeve; 802. Second condenser lens; 803. Threaded sleeve; 804. Slider; 9. Lens mechanism; 901. Second mounting sleeve; 902. Separator sleeve; 903. Second mounting slot; 904. Polarizing lens. Detailed Implementation

[0026] The present disclosure will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present disclosure and are not intended to limit the scope of the disclosure.

[0027] To keep the drawings concise, each drawing only schematically shows the parts relevant to the disclosure; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0028] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0029] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0031] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] like Figures 1 to 6As shown, this embodiment of the invention provides a laser cutting machine for container door frames, including a rotary base 1. A housing 2 is movably fitted onto the curved surface of the rotary base 1. Multiple heat sinks 201 are equidistantly fixedly installed on the outer circumference of the outer curved surface of the housing 2. A guide groove 202 is formed on the inner curved surface of the housing 2. Multiple first mounting grooves 101 are equidistantly formed on the upper circumference of the rotary base 1. Multiple first focusing lenses 3 are fixedly fitted into the center of each of the multiple first mounting grooves 101. The housing 2, heat sinks 201, and rotary base 1 all use materials with a thermal conductivity of not less than 300 kJ / m². Made of thermally conductive material with a strength of W / m·K, the outer shell 2, heat sink 201, and rotating base 1 are all made of copper alloy, thereby improving the thermal conductivity and heat dissipation performance of the outer shell 2, heat sink 201, and rotating base 1. This enables rapid heat dissipation of the first focusing lens 3, the second focusing lens 802, and the polarizing lens 904, which experience temperature rise due to contact with the laser, reducing their temperature and extending their service life. Multiple first focusing lenses 3 have equidistant focal lengths increasing clockwise. A mounting shell 4 slides on the upper surface of the rotating base 1. The upper part of the inner curved surface of the housing 2 is fixedly sleeved. Multiple mounting holes 401 are symmetrically opened on the upper surface of the mounting housing 4. A laser 5 is fixedly sleeved in the middle of each of the multiple mounting holes 401. The inner side of the mounting housing 4 is provided with a reflective coating, so as to reflect the light generated by the laser 5 and irradiating the side of the mounting housing 4, and concentrate it on the upper surface of the first focusing lens 3, thereby improving the utilization efficiency of the laser 5. A drive mechanism 6 is provided in the middle between the rotating base 1 and the mounting housing 4. A main shaft mechanism 7 is provided in the middle of the drive mechanism 6. Multiple focusing mechanisms 8 are provided between the inner curved surface of the housing 2 and the main shaft mechanism 7. A lens mechanism 9 is fixedly sleeved at the bottom of the housing 2.

[0033] like Figures 1 to 4 As shown, the drive mechanism 6 includes a protective shell 601, which is fixedly installed in the middle of the upper surface of the mounting shell 4. A drive seat 602 is fixedly sleeved on the upper part of the inner curved surface of the protective shell 601. A drive shaft 603 is movably sleeved in the middle of the mounting shell 4. The bottom end of the drive shaft 603 is fixedly connected to the middle of the upper surface of the rotary seat 1. A first drive member 604 is fixedly installed in the middle of the upper surface of the mounting shell 4. The drive shaft 603 is fixedly sleeved in the middle of the output shaft of the first drive member 604. The drive seat 602... A second driving component 605 is fixedly mounted on the upper surface. A connecting shaft 606 is fixedly mounted on the output end of the second driving component 605. The connecting shaft 606 is movably sleeved with the driving seat 602. The connecting shaft 606 is slidably sleeved with the rotating seat 1 and the driving shaft 603. The connecting shaft 606 is clearance-fitted with the rotating seat 1 and the driving shaft 603, thereby reducing the frictional resistance between the connecting shaft 606 and the rotating seat 1 and the driving shaft 603, and reducing the load when the second driving component 605 drives the first driving component 604 to rotate.

[0034] like Figure 2 and Figure 5 As shown, the spindle mechanism 7 includes a first threaded rod 701, which is fixedly installed at the bottom end of the connecting shaft 606. A second threaded rod 702 is fixedly installed at the bottom end of the connecting shaft 606. A third threaded rod 703 is fixedly installed at the bottom end of the second threaded rod 702. A fourth threaded rod 704 is fixedly installed at the bottom end of the third threaded rod 703. The thread directions of the first threaded rod 701 and the fourth threaded rod 704 are opposite, and the pitch of the first threaded rod 701 and the fourth threaded rod 704 is the same. The thread directions of the second threaded rod 702 and the third threaded rod 703 are opposite. This allows multiple focusing mechanisms 8 to move closer or further apart synchronously. The second threaded rod 702 and the third threaded rod 703 have the same pitch, and the pitch of the first threaded rod 701 is twice that of the second threaded rod 702. As a result, when multiple focusing mechanisms 8 move further apart or closer together, the distance between multiple sets of adjacent focusing mechanisms 8 remains the same. This ensures that the spacing between multiple high-temperature light spots on the central axis of the second mounting sleeve 901 below the subsequent polarizing lens 904 remains the same, thereby keeping the temperature of the high-temperature cutting line uniform and improving cutting accuracy.

[0035] like Figure 2 and Figure 5As shown, the focusing mechanism 8 includes a first mounting sleeve 801, with a second condenser lens 802 fixedly sleeved in the middle of the first mounting sleeve 801. A threaded sleeve 803 is fixedly installed on the side of the first mounting sleeve 801 near the main shaft mechanism 7, and the threaded sleeve 803 is threadedly connected to the main shaft mechanism 7. A slider 804 is fixedly installed on the side of the first mounting sleeve 801 away from the main shaft mechanism 7, and the slider 804 is slidably sleeved with its adjacent guide groove 202. The uppermost focusing mechanism 8 is threadedly connected to the first threaded rod 701, and the lowermost focusing mechanism 8 is threadedly connected to the fourth threaded rod 704. The two middle focusing mechanisms 8 are threadedly connected from top to bottom to the second threaded rod 702 and the third threaded rod 703, respectively. Furthermore, when the main shaft mechanism 7 rotates forward, the first threaded rod 701 and the fourth threaded rod 704 respectively drive the upper and lower focusing mechanisms 8 to move towards each other. 702 and the third threaded rod 703 respectively drive the two middle focusing mechanisms 8 connected to them to move towards each other, and the moving speed of the upper and lower focusing mechanisms 8 is twice that of the middle two focusing mechanisms 8. Similarly, when the main shaft mechanism 7 rotates in the opposite direction, the multiple focusing mechanisms 8 move away from each other, thereby changing the position of the high-temperature light spot after the laser is refracted by the second focusing lens 802 on the central axis of the second mounting sleeve 901 below the polarizing lens 904 by increasing the distance the focusing mechanisms 8 move up and down. In turn, by shortening or increasing the distance between the multiple focusing mechanisms 8, the distance between the multiple high-temperature light spots on the central axis of the second mounting sleeve 901 below the polarizing lens 904 is reduced or increased, thereby reducing or increasing the length of the high-temperature cutting line on the central axis of the second mounting sleeve 901 below the polarizing lens 904, and thus increasing or decreasing the temperature of the high-temperature cutting line.

[0036] like Figure 2 and Figure 5 As shown, the lens mechanism 9 includes a second mounting sleeve 901, which is fixedly fitted onto the bottom of the outer casing 2. A partition sleeve 902 is fixedly mounted in the middle of the second mounting sleeve 901. A plurality of second mounting slots 903 are symmetrically formed on the upper surface of the partition sleeve 902. A polarizing lens 904 is fixedly mounted in the middle of the plurality of second mounting slots 903. The second mounting sleeve 901 and the partition sleeve 902 are made of materials with a thermal conductivity of not less than 300. The second mounting sleeve 901 and the partition sleeve 902 are made of copper alloy, which improves the heat dissipation efficiency of the second mounting sleeve 901 and the partition sleeve 902 and reduces the temperature of the polarizing lens 904. The heat resistance coefficient of the materials used for the first condensing lens 3, the second condensing lens 802 and the second mounting groove 903 increases sequentially. This allows the use of different materials for the first condensing lens 3, the second condensing lens 802 and the second mounting groove 903 according to the size and temperature of the light spot irradiating the first condensing lens 3, the second condensing lens 802 and the second mounting groove 903, which can reduce manufacturing costs and subsequent replacement costs.

[0037] Working principle:

[0038] In use, the laser 5 is activated. Multiple laser beams generated by the laser 5 are focused by the first focusing lens 3 below it and then directed towards the focusing mechanism 8 below it. The focusing mechanism 8 refocuses the light passing through its upper and lower sides and refracts it towards the main shaft mechanism 7. The refracted light then strikes the polarizing lens 904. The polarizing lens 904 refracts the refracted light again in a direction away from the central axis of the second mounting sleeve 901, causing the multiple refracted beams to form a focused high-temperature spot on the central axis of the second mounting sleeve 901 below the polarizing lens 904, thus reducing the angle between the light beam and the central axis of the second mounting sleeve 901 and decreasing the cutting width. At this time, multiple lasers 5 and multiple first focusing lenses 3 with different focal lengths, multiple focusing mechanisms 8 with the same focal length, and multiple polarizing lenses 904 with the same focal length are set up to form multiple equidistant high-temperature spots on the central axis of the second mounting sleeve 901 below it. Then, the first driving component 604 is activated. The moving part 604 drives the drive shaft 603 to rotate, the drive shaft 603 drives the rotating base 1 to rotate at high speed, and the rotating base 1 drives multiple first focusing lenses 3 to rotate at high speed. At this time, since the focal length of the multiple first focusing lenses 3 increases at equal intervals along the clockwise direction, the first focusing lenses 3 with different focal lengths alternately focus the light generated by the laser 5 above them, so that multiple high-temperature light spots that are finally focused on the central axis of the second mounting sleeve 901 below the polarizing lens 904 move up and down at high speed alternately, so that multiple high-temperature light spots form a high-temperature cutting line. Thus, the light generated by multiple lasers 5 is focused at the same time, and high-temperature resistant materials are cut. This overcomes the problem that when existing laser cutting devices cut high-thickness plates, the focused high-temperature light spots are placed in the middle of the plate thickness, which causes the heat to accumulate slowly on the upper and lower surfaces of the plate, resulting in low cutting efficiency, or the heat is unevenly heated in the middle and upper parts of the plate by increasing the power consumption of the laser 5, resulting in large deformation of the plate cutting surface.

[0039] Furthermore, when this invention is used, the second driving member 605 is activated in the forward direction. The output end of the second driving member 605 drives the connecting shaft 606 to rotate. The connecting shaft 606 drives the first threaded rod 701 to rotate. The first threaded rod 701 drives the second threaded rod 702 to rotate. The second threaded rod 702 drives the third threaded rod 703 to rotate. The third threaded rod 703 drives the fourth threaded rod 704 to rotate. The first threaded rod 701 and the fourth threaded rod 704 are respectively driven by the slider 804 threadedly connected to them to move the uppermost focusing mechanism 8 and the lowermost focusing mechanism 8 towards each other. The second threaded rod 702 and the third threaded rod 704... The threaded rod 703 drives the two focusing mechanisms 8 in the middle to move in opposite directions through the slider 804 connected by its thread, thereby shortening the distance between the multiple second focusing lenses 802. This reduces the length of the high-temperature cutting line moving on the central axis of the second mounting sleeve 901 below the polarizing lens 904, increasing the heat accumulated per unit time and achieving efficient cutting of high-temperature resistant, thin plates. Similarly, the second driving component 605 is activated in the reverse direction, increasing the length of the high-temperature cutting line moving on the central axis of the second mounting sleeve 901 below the polarizing lens 904, and achieving efficient cutting of low-melting-point, thick plates.

[0040] It should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure and are not intended to limit it. Although this disclosure has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this disclosure without departing from the spirit and scope of the technical solutions of this disclosure, and all such modifications and substitutions should be covered within the scope of the claims of this disclosure.

Claims

1. A laser cutting machine for container door frame, comprising a rotating seat (1), characterized in that: The curved surface movable sleeve of the rotating base (1) is provided with an outer shell (2), a plurality of cooling fins (201) are fixedly installed on the outer curved surface of the outer shell (2) at equal intervals, a guide groove (202) is formed on the inner curved surface of the outer shell (2), a plurality of first installation grooves (101) are formed on the upper surface of the rotating base (1) at equal intervals, a plurality of first condenser lenses (3) are fixedly sleeved on the middle portions of the plurality of first installation grooves (101), the focal lengths of the plurality of first condenser lenses (3) increase at equal intervals in the clockwise direction, a mounting shell (4) is slidably arranged on the upper surface of the rotating base (1), the mounting shell (4) is fixedly sleeved with the upper portion of the inner curved surface of the outer shell (2), a plurality of mounting holes (401) are symmetrically formed on the upper surface of the mounting shell (4), a laser (5) is fixedly sleeved on the middle portion of each of the plurality of mounting holes (401), a light-reflecting coating is arranged on the inner side surface of the mounting shell (4), a driving mechanism (6) is arranged on the middle portion between the rotating base (1) and the mounting shell (4), the driving mechanism (6) comprises a protection shell (601), the protection shell (601) is fixedly installed on the middle portion of the upper surface of the mounting shell (4), a driving seat (602) is fixedly sleeved on the upper portion of the inner curved surface of the protection shell (601), a driving shaft (603) is movably sleeved on the middle portion of the mounting shell (4), the bottom end of the driving shaft (603) is fixedly connected with the middle portion of the upper surface of the rotating base (1), a first driving member (604) is fixedly installed on the middle portion of the upper surface of the mounting shell (4), the driving shaft (603) is fixedly sleeved on the middle portion of the output shaft of the first driving member (604), a second driving member (605) is fixedly installed on the upper surface of the driving seat (602), a connecting shaft (606) is fixedly installed on the output end of the second driving member (605), the connecting shaft (606) is movably sleeved with the driving seat (602), the connecting shaft (606) is slidably sleeved with the rotating base (1) and the driving shaft (603), the connecting shaft (606) is in clearance fit with the rotating base (1) and the driving shaft (603), a main shaft mechanism (7) is arranged on the middle portion of the driving mechanism (6), the main shaft mechanism (7) comprises a first threaded rod (701), the first threaded rod (701) is fixedly installed on the bottom end of the connecting shaft (606), a second threaded rod (702) is fixedly installed on the bottom end of the connecting shaft (606), a third threaded rod (703) is fixedly installed on the bottom end of the second threaded rod (702), a fourth threaded rod (704) is fixedly installed on the bottom end of the third threaded rod (703), a plurality of focus distance adjusting mechanisms (8) are arranged between the inner curved surface of the outer shell (2) and the main shaft mechanism (7), the focus distance adjusting mechanism (8) comprises a first installation sleeve (801), a second condenser lens (802) is fixedly sleeved on the middle portion of the first installation sleeve (801), a threaded sleeve (803) is fixedly installed on the side of the first installation sleeve (801) close to the main shaft mechanism (7), the threaded sleeve (803) is in threaded connection with the main shaft mechanism (7),The first mounting sleeve (801) is fixedly installed with a sliding block (804) away from one side of the main shaft mechanism (7), the sliding block (804) is slidably connected with the guide groove (202) adjacent to it, the bottom of the shell (2) is fixedly connected with a lens mechanism (9), the lens mechanism (9) comprises a second mounting sleeve (901), the second mounting sleeve (901) is fixedly connected with the bottom of the shell (2), the middle of the second mounting sleeve (901) is fixedly installed with a separation sleeve (902), the upper surface of the separation sleeve (902) is symmetrically provided with a plurality of second mounting grooves (903), the middle of the plurality of second mounting grooves (903) is fixedly installed with a polarizing lens (904), the polarizing lens (904) refracts the refracted light again in the direction away from the central axis of the second mounting sleeve (901).

2. A laser cutting machine for container door frames according to claim 1, characterized in that: The shell (2), the radiating fin (201) and the rotating seat (1) are made of a heat conductive material with a heat conductivity coefficient not less than 300 W / m·K.

3. A laser cutting machine for container door frames as claimed in claim 2, characterized in that: The first threaded rod (701) and the fourth threaded rod (704) are opposite in screw direction, and the first threaded rod (701) and the fourth threaded rod (704) are the same in pitch; the second threaded rod (702) and the third threaded rod (703) are opposite in screw direction, and the second threaded rod (702) and the third threaded rod (703) are the same in pitch; the pitch of the first threaded rod (701) is twice the pitch of the second threaded rod (702).

4. A laser cutting machine for container door frames as claimed in claim 3, wherein: The uppermost focusing distance adjusting mechanism (8) is in threaded connection with the first threaded rod (701), the lowermost focusing distance adjusting mechanism (8) is in threaded connection with the fourth threaded rod (704), and the two middle focusing distance adjusting mechanisms (8) are in threaded connection with the second threaded rod (702) and the third threaded rod (703) from top to bottom.

5. A laser cutting machine for container door frames as claimed in claim 4, wherein: When the spindle mechanism (7) rotates forward, the first threaded rod (701) and the fourth threaded rod (704) drive the upper and lower focusing distance adjusting mechanisms (8) to move towards each other, the second threaded rod (702) and the third threaded rod (703) drive the two middle focusing distance adjusting mechanisms (8) to move towards each other, and the moving speed of the upper and lower focusing distance adjusting mechanisms (8) is twice the moving speed of the two middle focusing distance adjusting mechanisms (8); similarly, when the spindle mechanism (7) rotates reversely, the focusing distance adjusting mechanisms (8) move away from each other.

6. A laser cutting machine for container door frames according to claim 5, characterized in that: The second mounting sleeve (901) and the separation sleeve (902) are made of a heat conductive material with a heat conductivity coefficient not less than 300 W / m·K.

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