A point scanning device with a disc-type chopper wheel

Abstract

The present invention discloses a point scanning device with a disc-type chopper wheel, comprising a disc-type chopper wheel, an X-ray source component and a fan-shaped collimator; the disc-type chopper wheel comprises a hub, a positioning wheel disc, a column collimator, a positioning mechanism and a lead shielding ring, the positioning wheel disc is fixed to the outer peripheral surface of the hub and is coaxial therewith, and a plurality of positioning mechanisms and a column collimator are arranged on the positioning wheel disc; the column collimator has a column collimation hole extending along the length direction inside; the fan-shaped collimator is fixed to the X-ray source component, and the fan-shaped collimator is located in the inner ring of the hub, and is used to collimate the X-rays generated by the X-ray source component to form a fan-shaped beam and emit it toward the inner peripheral surface of the hub; the central axis of each column collimation hole intersects at the center of the ray source, and the angles of the central axes of adjacent column collimation holes are equal and greater than the central angle of the fan-shaped collimation hole. The chopper wheel component of the present invention adopts a novel disc-type structure to achieve high speed, small size, light weight and economy of the chopper wheel.

Description

Technical Field

[0001] The invention relates to the technical field of X-ray backscatter imaging inspection, and in particular to a point scanning device with a disc-type chopper wheel for an X-ray backscatter imaging system. Background Art

[0002] X-ray backscatter imaging inspection technology is an inspection technology that uses X-ray beams to scan and irradiate the inspected object, detects and receives the backscattered rays of the inspected object, and then images it after analysis and processing. Backscatter detection uses point scanning technology, which has the characteristics of low radiation dose and outstanding detection images of light materials such as explosives and drugs. It is widely used in the field of security inspection of human bodies, goods, and vehicles, and conducts anti-smuggling, anti-drug, anti-terrorism and anti-explosion inspections.

[0003] X-ray backscatter imaging equipment usually uses chopper wheel collimation technology to collimate X-rays into a continuously rotating pencil beam, which continuously scans the object to be inspected point by point to complete point scanning backscatter imaging inspection. The most commonly used point scanning devices usually include chopper wheel collimation devices, cylindrical jumper collimation devices, disk slit collimation devices and other types.

[0004] Among them, the cutting wheel collimation device is completely mounted on the periphery of the X-ray source and rotates around the ray source. The bearing diameter of the cutting wheel rotating mechanism is required to be larger than the external dimensions of the ray source, resulting in a large turning radius and a large moment of inertia of the cutting wheel. It cannot rotate and scan at high speed, which affects the resolution of the detected image and the imaging quality is not high. It also causes the size and weight of the entire detection equipment to increase. The pencil-shaped ray beams at various exit angles of the cylindrical jumper collimation device have different beam cross-sections, and the scanning is intermittent, which affects the detection imaging quality. At the same time, the processing of the incident spiral slit and the exit spiral slit is complicated and the manufacturing cost is high. When the disc-type slit chopper wheel collimation slit is rotated to different positions, the pencil-shaped ray beam has different exit angles and beam cross-sections, which affects the scanning detection imaging quality. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention aims to provide a point scanning device with a disc-type chopper wheel.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A point scanning device with a disc chopper wheel comprises a disc chopper wheel, an X-ray source component and a fan-shaped collimator; the disc chopper wheel comprises a hub, a positioning wheel disc, a column collimator, a positioning mechanism and a lead shielding ring, the lead shielding ring is fixed to and covers the inner circumference of the hub, the positioning wheel disc is fixed to the outer circumference of the hub and is coaxial therewith, a plurality of positioning mechanisms and a column collimator are arranged on the positioning wheel disc, one end of the column collimator passes through and is fixedly connected to the hub and the lead shielding ring, and the other end is connected to the positioning mechanism; the column collimator has a column collimation hole extending in the length direction, the inlet end of the column collimation hole is communicated with the inner ring of the hub, and the outlet end of the column collimation hole is communicated with the outside; the fan-shaped The collimator is fixed to the X-ray source component, the ray source center of the X-ray source component is located on the central axis of the fan-shaped collimation hole of the fan-shaped collimator and is in the same straight line with the central axis of the hub; the fan-shaped collimator is located on the inner ring of the hub, and is used to collimate the X-rays generated by the X-ray source component to form a fan-shaped ray beam and emit it in the direction of the inner circumference of the hub; the central axes of the collimation holes of each column intersect with the ray source center and are located in the same plane with the central axis of the fan-shaped collimation hole, the angles of the central axes of adjacent column collimation holes are equal and greater than the central angle of the fan-shaped collimation hole, and at most only one column collimation hole has an entrance end located within the emission range of the fan-shaped collimation hole at the same time; the hub is transmission-connected to the power device and driven to rotate by the power device.

[0008] Furthermore, the disc chopper wheel also includes a bearing cantilever frame and a drive shaft component, the drive shaft component is connected to the bearing on the top of the bearing cantilever frame, one end of the drive shaft component is transmission-connected to the output shaft of the drive motor, and the other end is transmission-connected to the wheel hub.

[0009] Furthermore, one end of the X-ray source component away from the sector collimator is connected to a support base, and the bottom surface of the support base and the bottom surface of the bearing cantilever frame are located on the same horizontal plane.

[0010] Furthermore, the column collimator is made of a high-density material that can effectively shield X-rays and has a mechanical structure strength that meets design requirements.

[0011] Furthermore, the cross-sectional shape of the column collimating hole is circular or rectangular.

[0012] Furthermore, the hub is made of high-quality structural steel and the positioning wheel disc is made of high-strength aluminum.

[0013] Furthermore, the positioning wheel is provided with a plurality of dynamic balancing weight holes with equal radius along the circumferential direction, and the dynamic balancing weight holes are arranged at equal angles.

[0014] Furthermore, a plurality of dynamic balancing auxiliary weight holes with equal radius are arranged on the wheel hub along the circumferential direction, and the dynamic balancing auxiliary weight holes are arranged at equal angles.

[0015] Furthermore, the hub is provided with a plurality of column synchronization signal photoelectric holes, the number of the column synchronization signal photoelectric holes is the same as the number of the column collimators and are distributed along the circumferential direction, a column synchronization signal photoelectric hole is provided between every two adjacent column collimators, and the center of the column synchronization signal photoelectric hole is located on the angular bisector of the angle between the central axes of the two adjacent column collimators; two column synchronization signal control boards are respectively provided on both sides of the column synchronization signal photoelectric hole along the central axis direction, one of the column synchronization signal control boards is provided with a photoelectric transmitting end, and the other column synchronization signal control board is provided with a photoelectric receiving end; the two side boundaries of the fan-shaped collimating hole are respectively the rotation-in boundary and the rotation-out boundary along the rotation direction of the hub, and whenever the entrance end of the column collimating hole rotates to reach the rotation-in boundary of the fan-shaped collimating hole, there is exactly one column synchronization signal photoelectric hole corresponding to the photoelectric transmitting end and the photoelectric receiving end respectively.

[0016] Furthermore, a wheel synchronization signal photoelectric hole is arranged directly above or below one of the column synchronization signal photoelectric holes; two photoelectric emitting terminals are arranged on one of the column synchronization signal control boards, and two photoelectric receiving terminals are arranged on the other column synchronization signal control board, and the two photoelectric emitting terminals and the two photoelectric receiving terminals are respectively located on a vertical straight line; when the column synchronization signal photoelectric hole with the wheel synchronization signal photoelectric hole arranged directly above or below is rotated to correspond to the two column synchronization signal control boards, the column synchronization signal photoelectric hole just corresponds to one of the photoelectric emitting terminals and the photoelectric receiving terminal, and the wheel synchronization signal photoelectric hole just corresponds to the other photoelectric emitting terminal and the photoelectric receiving terminal.

[0017] The beneficial effects of the present invention are:

[0018] 1) In the present invention, the chopper wheel component adopts a novel disc structure, and the design of the wheel disc, wheel hub and column collimator helps to optimize the size of the chopper wheel, simplify the structure of the chopper wheel, reduce the moment of inertia of the chopper wheel, and increase the rotation speed of the chopper wheel, thereby improving the resolution of the detection image and realizing the high speed, small size, light weight and economy of the chopper wheel.

[0019] 2) The present invention realizes the setting of the column collimator by adopting a positioning wheel and a positioning mechanism, thereby ensuring reliable connection and precise positioning of the column collimator, making the pencil beam scanning more accurate and improving the quality of the detected image.

[0020] 3) The present invention adopts high-density materials such as tungsten-iron-nickel alloy that can shield X-rays and have a certain mechanical structural strength to make the column collimator, ensuring that the collimated pencil-shaped beam has equal cross-section, and the beam energy is concentrated in the high-energy area, thereby improving the penetration of radiation detection.

[0021] 4) In the present invention, the chopper wheel generates a synchronous photoelectric signal to control the detector signal collection, and at the same time controls the chopper wheel drive motor to limit brake, ensuring that after the chopper wheel is braked, the column collimator is not within the fan-shaped collimation hole range to prevent radiation leakage during non-detection work. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the overall structure of the point scanning device in an embodiment of the present invention;

[0023] Figure 2 is a schematic cross-sectional view of a point scanning device in an embodiment of the present invention;

[0024] Figure 3 for Figure 2 A schematic cross-sectional view of the direction shown in B;

[0025] Figure 4 for Figure 3 A schematic diagram of a local A enlargement;

[0026] Figure 5 Schematic diagram of optical path design according to an embodiment of the present invention. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the accompanying drawings. It should be noted that this embodiment is based on the technical solution and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to this embodiment.

[0028] This embodiment provides a point scanning device with a disc-type chopper wheel, such as Figure 1-4As shown, it includes a disc chopper wheel, an X-ray source component 4 and a fan-shaped collimator 3; the disc chopper wheel includes a hub 11, a positioning wheel disc 12, a column collimator 13, a positioning mechanism 14 and a lead shielding ring 15, the lead shielding ring 15 is fixed to and covers the inner circumference of the hub 11, the positioning wheel disc 12 is fixed to the outer circumference of the hub 11 and is coaxial therewith, a plurality of positioning mechanisms 14 and a column collimator 13 are provided on the positioning wheel disc 12, one end of the column collimator 13 passes through and is fixedly connected to the hub 11 and the lead shielding ring 15, and the other end is connected to the positioning mechanism 14; the column collimator 13 has a column collimation hole 131 extending in the length direction, the inlet end of the column collimation hole 131 is communicated with the inner ring of the hub 11, and the outlet end of the column collimation hole 131 is communicated with the outside; The fan-shaped collimator 3 and the X-ray source component 4 are fixed, and the ray source center 401 of the X-ray source component 4 is located on the central axis of the fan-shaped collimation hole of the fan-shaped collimator and is in the same straight line with the central axis of the hub 11; the fan-shaped collimator 3 is located in the inner ring of the hub 11, and is used to collimate the X-rays generated by the X-ray source component 4 to form a fan-shaped ray beam and emit it in the direction of the inner circumference of the hub 11; the central axes of each column collimation hole 131 intersect with the ray source center 401 and are located in the same plane with the central axis of the fan-shaped collimation hole, the angles between the central axes of adjacent column collimation holes 131 are equal and greater than the central angle of the fan-shaped collimation hole, and at most one entrance end of the column collimation hole 131 is located within the emission range of the fan-shaped collimation hole at the same time; the hub 11 is transmission-connected to the power device and driven to rotate by the power device.

[0029] It should be noted that in the above-mentioned point scanning device, the X-rays of the X-ray component 4 are emitted from the ray source core 401, collimated into a fan-shaped beam through the fan-shaped collimator hole in the fan-shaped collimator 3, and then emitted in the direction of the inner circumference of the hub 11. During the high-speed rotation of the hub 11 around the fan-shaped collimator 3, when the fan-shaped beam reaches the position of the non-pipe column collimation hole entrance end on the inner circumference of the hub 11, it will be shielded by the lead shielding ring 15 and cannot be emitted to the outside of the hub. When it reaches the entrance end of the pipe column collimation hole, it will enter the pipe column collimation hole from the entrance end of the pipe column collimation hole, and after being collimated into a pencil-shaped beam, it will be emitted from the exit end to irradiate the object to be detected. After stopping the scanning, the hub 11 stops rotating, and it is necessary to ensure that after the hub 11 is completely stationary, all the pipe column collimation holes 131 are not within the emission range of the fan-shaped collimation hole to prevent radiation leakage during non-detection work.

[0030] The central axis angle of adjacent column collimation holes 131 is greater than the central angle of the fan-shaped collimation hole. During the rotation of the hub 11, at most only one column collimation hole 131 will be within the emission range of the fan-shaped collimation hole at the same time, so that only one beam of radiation is always emitted from the disc chopper wheel. As the hub 11 rotates at a high speed, the column collimator 13 rotates within the fan-shaped collimation hole range, so that there are continuous rays collimated into pencil-shaped beams through the column collimation holes 131 and then irradiated on the object to be detected, thereby completing a row of scans of the object to be detected from top to bottom.

[0031] In this embodiment, the column collimators 13 include four, the central axis angle of adjacent column collimating holes 131 is 90°, and the central angle of the sector collimating holes of the sector collimator 3 is 86°.

[0032] Specifically, the inlet end of the collimation hole of the column collimator 13 is threadedly connected to the hub 11 and the lead shielding ring 15 .

[0033] Specifically, in the present embodiment, the disc chopper wheel also includes a bearing cantilever frame 7 and a drive shaft component 6, wherein the drive shaft component 6 is connected to the bearing at the top of the bearing cantilever frame 7, one end of which is connected to the output shaft of the drive motor 1, and the other end is connected to the hub 11. The disc chopper wheel is supported by the bearing cantilever frame 7, which can meet the design and use conditions of high-speed and high-precision bearings, and finally realizes high-speed, accurate, stable and reliable rotation of the chopper wheel, realizes high-speed scanning, and improves image resolution. The rotation speed of the drive motor 1 can be set according to the scanning speed.

[0034] Furthermore, in this embodiment, the end of the X-ray source component 4 away from the sector collimator 13 is connected to a support base 2, and the bottom surface of the support base 2 and the bottom surface of the bearing cantilever frame 7 are located on the same horizontal plane, which is convenient for positioning and installing the device.

[0035] Furthermore, the column collimator 13 is made of a high-density material that can effectively shield X-rays and has a mechanical structural strength that meets design requirements, such as tungsten-iron-nickel alloy. The cross-sectional shape of the column collimating hole 131 can be circular or rectangular.

[0036] Furthermore, the hub 11 is made of high-quality structural steel, and the positioning wheel disc 12 is made of high-strength aluminum, which further reduces the weight and moment of inertia of the chopper wheel and achieves a lightweight design.

[0037] Furthermore, the positioning wheel 12 is provided with a plurality of dynamic balancing weight holes 121 of equal radius along the circumferential direction, and the dynamic balancing weight holes 121 are arranged at equal angles. The dynamic balancing weight holes 121 are used for dynamic balancing correction of the disc chopper wheel component. In this embodiment, there are 8 dynamic balancing weight holes 121, one of which is arranged every 45°.

[0038] Furthermore, the hub 11 is provided with a plurality of dynamic balancing auxiliary weight holes 111 with equal radius along the circumferential direction, and the dynamic balancing auxiliary weight holes 111 are arranged at equal angles. The dynamic balancing auxiliary weight holes 111 are used to further assist in the dynamic balancing correction of the disc chopper wheel component.

[0039] It should be noted that the disc chopper wheel will inevitably have deviations due to reasons such as processing and assembly. A dynamic balancing tester can be used to detect the unbalanced mass and position, and the corresponding counterweights can be fixed on the dynamic balancing counterweight holes 121 or the dynamic balancing auxiliary counterweight holes 111 at the corresponding positions by adding counterweights to complete the dynamic balancing correction.

[0040] Furthermore, the hub 11 is provided with a plurality of column synchronization signal photoelectric holes 112, the number of the column synchronization signal photoelectric holes 112 is the same as the number of the column collimators 13 and are distributed along the circumferential direction, a column synchronization signal photoelectric hole 112 is provided between every two adjacent column collimators 13, and the center of the column synchronization signal photoelectric hole 112 is located on the bisector of the angle between the central axes of the two adjacent column collimation holes 131; the column synchronization signal photoelectric hole 112 is provided with two column synchronization signal control boards 5 on both sides along the central axis direction, one of the column synchronization signal control boards 5 is provided with a photoelectric transmitting end, and the other column synchronization signal control board 5 is provided with a photoelectric receiving end; the two side boundaries of the fan-shaped collimation hole are respectively a screw-in boundary and a screw-out boundary along the rotation direction of the hub, and whenever the entrance end of the column collimation hole 131 rotates to reach the screw-in boundary of the fan-shaped collimation hole, there is exactly one column synchronization signal photoelectric hole 112 corresponding to the photoelectric transmitting end and the photoelectric receiving end respectively.

[0041] In this embodiment, corresponding to the four column collimators 13, the hub 11 is provided with four column synchronization signal photoelectric holes 112 at a scale of 4×90°.

[0042] It should be noted that the two column synchronization signal control boards are independently fixed and do not rotate with the wheel hub. During the rotation of the wheel hub, the column synchronization signal control board with a photoelectric transmitting end continuously generates an infrared light beam. When there is a column synchronization signal photoelectric hole corresponding to it, the infrared light beam passes through the column synchronization signal photoelectric hole and is received by the column synchronization signal control board with a photoelectric receiving end to generate a column synchronization signal. The column synchronization signal control board with a photoelectric receiving end transmits the column synchronization signal to the signal acquisition system. The signal acquisition system uses the column synchronization signal to perform timing synchronization calibration on the detection signal for computer image regeneration processing and imaging and display of the detection image. In this embodiment, 4 columns of timing photoelectric signals are generated per rotation.

[0043] Furthermore, in the present embodiment, a wheel synchronization signal photoelectric hole 113 is arranged directly above or below one of the column synchronization signal photoelectric holes 112; two photoelectric emitting terminals are arranged on one of the column synchronization signal control boards 5, and two photoelectric receiving terminals are arranged on the other column synchronization signal control board 5, and the two photoelectric emitting terminals and the two photoelectric receiving terminals are respectively located on a vertical straight line; when the column synchronization signal photoelectric hole 112 with the wheel synchronization signal photoelectric hole 113 arranged directly above or below is rotated to correspond to the two column synchronization signal control boards 5, the column synchronization signal photoelectric hole 112 just corresponds to one of the photoelectric emitting terminals and the photoelectric receiving terminal, and the wheel synchronization signal photoelectric hole 113 just corresponds to the other photoelectric emitting terminal and the photoelectric receiving terminal.

[0044] When the wheel synchronization signal photoelectric hole rotates to correspond to the two column synchronization signal control boards, the infrared light beam emitted by the photoelectric transmitting end at the corresponding position passes through the wheel synchronization signal photoelectric hole and is received by the corresponding photoelectric receiving end, thereby generating a wheel synchronization signal. The corresponding column synchronization signal control board transmits the wheel synchronization signal to the signal acquisition system. On the one hand, the wheel synchronization signal can be used to detect the rotation speed of the chopper wheel in real time, and on the other hand, it can be used to divide and calibrate the generation timing of the first column detection signal, and the second, third, and fourth column detection signals are generated in sequence subsequently. In addition, the wheel synchronization signal can be used to determine the braking stop position of the column collimator 13 (a 45° rotation angle in this embodiment) to ensure that non-detection rays are emitted.

[0045] It should be noted that since the image quality and resolution are affected by the scanning spot size and scanning speed, under certain conditions, the smaller the scanning spot diameter and the higher the scanning speed, the higher the image resolution and the better the image quality. Therefore, to improve the resolution and image quality of the scanned image, it is necessary to appropriately reduce the scanning spot size and increase the chopper wheel speed.

[0046] like Figure 5 As shown, D1 represents the outer diameter of the ray emission area, and D2 represents the ray collimation aperture. When the X-ray emission point is outside the center of D1, the emitted X-ray increases the spot size, and its emission should be shielded as much as possible. Among them, L1 and L2 represent the length of the collimation hole when the radius of the hub 11 is R1, L1 represents that the column collimator extends outside the hub 11, and L2 represents that the length of the column collimator is the same as the thickness of the hub 11. L3 represents the length of the collimation hole when the radius of the hub 11 is R2, R1 is less than R2, and L3 is equal to L2. From Figure 5It can be seen that L1, L2, and L3 correspond to different X-ray emission angles β1, β2, and β3, respectively, among which the emission angle β1 corresponding to L1 is the smallest, and the corresponding spot is the smallest, which meets the design requirements of highest resolution and minimum single detection dose. When the X-ray emission point is less than or equal to the diameter D1, the collimation spot effects of the collimation lengths L1 and L3 are the same, and the collimation spot effect of L2 is relatively the worst. In addition, when the hub radius is R2, the structural dimensions, weight, and moment of inertia are large, and the manufacturing difficulty and processing cost are increased. Therefore, this embodiment adopts a smaller hub radius and a longer column collimator length, which can realize a lightweight and miniaturized design of the chopper wheel structure.

[0047] For those skilled in the art, various corresponding changes and modifications can be made according to the above technical solutions and concepts, and all of these changes and modifications should be included in the protection scope of the claims of the present invention.

Claims

1. A point scanning device with a disc-type chopper wheel, characterized in that: The invention comprises a disc-type chopper wheel, an X-ray source component and a sector collimator; the disc-type chopper wheel comprises a hub, a positioning wheel disc, a column collimator, a positioning mechanism and a lead shielding ring, the lead shielding ring is fixed to and covers the inner circumference of the hub, the positioning wheel disc is fixed to the outer circumference of the hub and is coaxial therewith, a plurality of positioning mechanisms and a column collimator are arranged on the positioning wheel disc, one end of the column collimator passes through and is fixedly connected to the hub and the lead shielding ring, and the other end is connected to the positioning mechanism; the column collimator has a column collimation hole extending in the length direction, the inlet end of the column collimation hole is communicated with the inner ring of the hub, and the outlet end of the column collimation hole is communicated with the outside; the sector collimator and the X-ray source The components are fixed, the ray source center of the X-ray source component is located on the central axis of the fan-shaped collimation hole of the fan-shaped collimator and is in the same straight line with the central axis of the hub; the fan-shaped collimator is located in the inner ring of the hub, and is used to collimate the X-rays generated by the X-ray source component to form a fan-shaped ray beam and emit it in the direction of the inner circumference of the hub; the central axes of the collimation holes of each column intersect with the ray source center and are located in the same plane with the central axis of the fan-shaped collimation hole, the included angles of the central axes of adjacent column collimation holes are equal and greater than the central angle of the fan-shaped collimation hole, and at most only one column collimation hole has an entrance end located within the emission range of the fan-shaped collimation hole at the same time; the hub is transmission-connected to the power device and driven to rotate by the power device; A plurality of column synchronization signal photoelectric holes are arranged on the hub, the number of the column synchronization signal photoelectric holes is the same as the number of column collimators and are distributed along the circumferential direction, a column synchronization signal photoelectric hole is arranged between every two adjacent column collimators, and the center of the column synchronization signal photoelectric hole is located on the angular bisector of the angle between the central axes of the two adjacent column collimators; two column synchronization signal control boards are arranged on both sides of the column synchronization signal photoelectric hole along the central axis direction, one of the column synchronization signal control boards is provided with a photoelectric transmitting end, and the other column synchronization signal control board is provided with a photoelectric receiving end; the two side boundaries of the fan-shaped collimating hole are respectively the rotation-in boundary and the rotation-out boundary along the rotation direction of the hub, and whenever the entrance end of the column collimating hole rotates to reach the rotation-in boundary of the fan-shaped collimating hole, there is exactly one column synchronization signal photoelectric hole corresponding to the photoelectric transmitting end and the photoelectric receiving end respectively.

2. The point scanning device with a disc-type chopper wheel according to claim 1, characterized in that: The disc chopper wheel also includes a bearing cantilever frame and a driving shaft component. The driving shaft component is connected to the bearing on the top of the bearing cantilever frame, one end of which is drivingly connected to the output shaft of the driving motor, and the other end is drivingly connected to the wheel hub.

3. The point scanning device with a disc-type chopper wheel according to claim 1, characterized in that: One end of the X-ray source component away from the sector collimator is connected to a support base, and the bottom surface of the support base and the bottom surface of the bearing cantilever frame are located on the same horizontal plane.

4. The point scanning device with a disc-type chopper wheel according to claim 1, characterized in that: The column collimator is made of a high-density material that can effectively shield X-rays and has a mechanical structure strength that meets design requirements.

5. The point scanning device with a disc-type chopper wheel according to claim 1, characterized in that: The cross-sectional shape of the column collimating hole is circular or rectangular.

6. The point scanning device with a disc-type chopper wheel according to claim 1, characterized in that: The wheel hub is made of high-quality structural steel and the positioning wheel disc is made of high-strength aluminum.

7. The point scanning device with a disc-type chopper wheel according to claim 1, characterized in that: The positioning wheel is provided with a plurality of dynamic balancing weight holes with equal radius along the circumferential direction, and the dynamic balancing weight holes are arranged at equal angles.

8. The point scanning device with a disc-type chopper wheel according to claim 7, characterized in that: The wheel hub is provided with a plurality of dynamic balancing auxiliary weight holes with equal radius along the circumferential direction, and the dynamic balancing auxiliary weight holes are arranged at equal angles.

9. The point scanning device with a disc-type chopper wheel according to claim 1, characterized in that: A wheel synchronization signal photoelectric hole is arranged directly above or below one of the column synchronization signal photoelectric holes; two photoelectric emitting ends are arranged on one of the column synchronization signal control boards, and two photoelectric receiving ends are arranged on the other column synchronization signal control board, and the two photoelectric emitting ends and the two photoelectric receiving ends are respectively located on a vertical straight line; when the column synchronization signal photoelectric hole with the wheel synchronization signal photoelectric hole arranged directly above or below is rotated to correspond to the two column synchronization signal control boards, the column synchronization signal photoelectric hole just corresponds to one of the photoelectric emitting ends and the photoelectric receiving end, and the wheel synchronization signal photoelectric hole just corresponds to the other photoelectric emitting end and the photoelectric receiving end.

Images