Adjustable focusing grating point light source

Abstract

The present application relates to the technical fields of machine vision light source detection, and discloses an adjustable focusing grating point light source, which comprises a first shell, a light source module is installed in the first shell, a second shell is connected to the first shell, a rotating disc is rotatably installed in the second shell, three calibration plates are installed on the rotating disc, and gratings are installed in the calibration plates, a switching assembly is further included, the switching assembly comprises a knob, a gear and a crown gear ring, a blowing assembly is arranged on the second shell and used for cleaning the gratings by blowing, the knob is rotated to drive the rotating disc to rotate, the three calibration plates with the gratings are switched in position, different gratings are switched to the light channel in the first shell, different detection requirements are met, the operation is convenient, and the switching efficiency is high.

Description

Technical Field

[0001] This invention relates to the field of machine vision light source detection technology, specifically to an adjustable focusing grating point light source. Background Technology

[0002] A grating point light source is an optical device that uses a grating structure to modulate the light source to achieve a specific light field distribution. Its structure mainly consists of a light source module, a grating assembly, an optical lens group, and a supporting and fixing structure. The light source module typically uses LED chips, laser diodes, etc., as the light-emitting core to provide a high-brightness, narrow-spectrum initial light source. The grating assembly is mostly a periodically arranged microstructure element, and common types include rectangular gratings, sinusoidal gratings, and blazed gratings. The grating is fabricated through processes such as photolithography and nanoimprinting, and can modulate the incident light through diffraction, beam splitting, or beam focusing. The optical lens group generally consists of collimating lenses and focusing lenses to optimize the directionality and uniformity of the emitted light. Existing technology can combine a vision camera with a grating point light source for machine vision light source detection, which is often used for defect detection. In actual operation, the grating point light source projects an image onto the object to be detected, and then the vision camera acquires the image information. When a defect point appears, an image anomaly point is directly generated. By analyzing the anomaly point in the image information through the detection host, the defect detection result can be obtained.

[0003] However, the existing technology has the following problems:

[0004] Most existing grating point light sources are equipped with a single type of grating. Since some detection scenarios may require the detection of various different objects, such as flat, spherical, and irregular objects, the requirements for the grating imaging pattern are also different. This makes it necessary for staff to equip multiple light sources according to actual requirements and disassemble and replace the light sources according to the needs of use during detection, which is quite troublesome. Summary of the Invention

[0005] The purpose of this invention is to provide an adjustable focusing grating point light source to solve the above-mentioned problems and overcome the defects of the prior art, as detailed below.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] This invention provides an adjustable focusing grating point light source, comprising: a first housing, inside which a light source module is installed; a heat sink is connected to the top of the first housing, and a lens is connected to the bottom of the first housing; a second housing is connected to the first housing, and a turntable is rotatably installed inside the second housing, with three calibration plates installed on the turntable, and a grating installed inside the calibration plates; a switching assembly is also included, comprising a knob, a gear, and a crown gear ring; the knob is rotatably installed on the first housing, the gear is connected to the knob and located inside the first housing, and the crown gear ring is installed on the turntable and meshes with the gear; a purging assembly is provided on the second housing for cleaning the grating by purging.

[0008] Preferably, the light source module includes a light source, a lens group, and a peripheral group, and the focal length of the lens group can be adjusted by rotating the peripheral group.

[0009] Preferably, a triangular block is connected to the calibration plate, a positioning slider is slidably installed inside the first housing, a spring is provided between the positioning slider and the inner wall of the first housing, and a V-shaped groove matching the triangular block is opened on the positioning slider. When the calibration plate is in the working position, the triangular block above it is embedded in the V-shaped groove of the positioning slider.

[0010] Preferably, the purging assembly includes a first airbag and three second airbags. The first airbag is mounted on the top surface of the second housing, and the three second airbags are mounted on the inner wall of the second housing. Three air tubes are connected to the first airbag, and the ends of the three air tubes away from the first airbag are respectively connected to the three second airbags. A purging pipe is connected to the bottom of the first airbag and passes through the top of the second housing. A nozzle is connected to the calibration plate, and the nozzle can communicate with the purging pipe when it moves. A sealing block is connected between two adjacent calibration plates. The three calibration plates and the three sealing blocks can seal the bottom of the purging pipe. An air outlet window is installed on the second housing.

[0011] Preferably, the first airbag and the second airbag are respectively provided with elastic reset mechanisms. The turntable has three slots, and the three second airbags are respectively located in the three slots. When the slots move, the edges can contact and compress the second airbags. Two air intake filters are installed on the second airbags, and the air intake filters protrude from the outer wall of the second housing.

[0012] Preferably, the calibration plate is provided with an exhaust groove, and the gas ejected from the nozzle can pass through the surface of the grating and be discharged through the exhaust groove of the calibration plate. The gas discharged through the exhaust groove of the calibration plate is discharged out of the second housing through the air outlet window.

[0013] Preferably, the second housing is provided with a display unit, which includes an indicator dial and a pointer. The indicator dial is mounted on the second housing, and a triangular wheel is rotatably mounted on the second housing. The pointer is mounted on the triangular wheel and is located above the indicator dial. One of the second airbags is connected to a sliding shaft, which is slidably connected to the second housing. A connecting rod is connected to the sliding shaft, and a lever is hinged to the connecting rod.

[0014] Preferably, a reset mechanism is provided between the lever and the connecting rod. When the lever moves toward the slide shaft, it can contact and drive the triangular wheel to rotate 120 degrees. When the lever moves away from the slide shaft, it is subjected to the counter-thrust force of the triangular wheel and swings.

[0015] Preferably, the first housing is provided with a dust removal part, which includes a cleaning rod. The cleaning rod is rotatably mounted on the first housing. A protruding rod is connected to the cleaning rod, and a pull rod is connected to the connecting rod. An elastic rod is connected between the protruding rod and the pull rod. When the protruding rod moves, it can drive the cleaning rod to swing. When the cleaning rod swings, it contacts the surface of the lens.

[0016] The beneficial effects are:

[0017] 1. This adjustable focusing grating point light source, through the setting of the switching component, allows the operator to drive the turntable to rotate by turning the knob, thereby switching the positions of the three calibration plates equipped with gratings. This allows different gratings to be switched onto the light channel in the first housing to meet different detection needs. The operation is convenient and the switching efficiency is high. Furthermore, by utilizing the cooperation between the positioning slider and the triangular block, the positioning slider applies pressure to the triangular block through the elastic force of the spring using the V-groove. This ensures the switching accuracy and also prevents the turntable from shifting due to vibration or other factors during operation, ensuring that the grating is always in the correct working position, thus guaranteeing the stability of the detection process.

[0018] 2. The adjustable focusing grating point light source, through the setting of the purge assembly, enables the first airbag to inflate when the switching assembly switches the position of the three calibration plates, and supplies air to the nozzles on the calibration plate below it through the purge pipe, so that the nozzles spray air to blow away the fine dust adhering to the surface of the calibration plate, thereby ensuring the cleanliness of the calibration plate surface and avoiding the impact of dust on the detection accuracy.

[0019] 3. The adjustable focusing grating point light source, through the setting of the display unit, allows the pointer to move to the corresponding pattern on the indicator panel as the switching component operates, thereby indicating the grating currently in the working position, making it easier for the operator to distinguish the specific position information of the current grating when switching gratings. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the first housing structure of the present invention;

[0023] Figure 3 This is a schematic diagram of the second housing structure of the present invention;

[0024] Figure 4 This is a schematic diagram of the switching component structure of the present invention;

[0025] Figure 5 This is a schematic diagram of the positioning slider structure of the present invention;

[0026] Figure 6 This is a schematic diagram of the purging assembly structure of the present invention;

[0027] Figure 7 This is a schematic diagram of the first airbag structure of the present invention;

[0028] Figure 8 This is a schematic diagram of the nozzle structure of the present invention;

[0029] Figure 9 This is a schematic diagram of the second airbag structure of the present invention;

[0030] Figure 10 This is a schematic diagram of the exhaust window structure of the present invention;

[0031] Figure 11 This is a schematic diagram of the display section structure of the present invention;

[0032] Figure 12 This is a schematic diagram of the triangular wheel structure of the present invention;

[0033] Figure 13 This is a schematic diagram of the cleaning section structure of the present invention.

[0034] The annotations in the attached figures are explained as follows:

[0035] 1. First housing; 11. Lens; 12. Heat sink; 13. Light source module; 14. Calibration board; 15. Grating;

[0036] 2. Second shell; 21. Turntable;

[0037] 3. Switching components; 31. Knob; 32. Gear; 33. Crown gear ring; 34. Triangular block; 35. Positioning slider;

[0038] 4. Purge assembly; 41. First airbag; 42. Air tube; 43. Second airbag; 44. Intake filter; 45. Purge pipe; 46. Nozzle; 47. Sealing block; 48. Air outlet window;

[0039] 5. Display unit; 51. Indicator dial; 52. Slide shaft; 53. Connecting rod; 54. Lever; 55. Triangular wheel; 56. Pointer;

[0040] 6. Dust removal section; 61. Pull rod; 62. Cleaning rod; 63. Protruding rod; 64. Elastic rod. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0042] Example 1

[0043] Most existing grating point light sources are equipped with a single type of grating. Since some detection scenarios may require the detection of various different objects, such as flat, spherical, and irregular objects, the requirements for the grating imaging pattern are also different. This requires the staff to equip multiple light sources according to actual requirements and disassemble and replace the light sources according to the needs of use during detection, which is quite troublesome. In order to solve the above problems, this embodiment is invented.

[0044] Please see Figure 1 - Figure 5An adjustable focusing grating point light source includes: a first housing 1, inside which a light source module 13 is installed; a heat sink 12 is connected to the top of the first housing 1; and a lens 11 is connected to the bottom of the first housing 1. When the light source module 13 operates, it generates heat. The heat sink 12 quickly absorbs and dissipates the heat through a metal thermally conductive material, preventing performance degradation or damage to the light source module 13 due to high temperatures. The lens 11 is a transparent, flat lens, serving as a dustproof and protective element. The light source module 13 includes a light source, a lens group, and a peripheral group. Rotating the peripheral group adjusts the focal length of the lens group. The light source provides the light source, and the lens group, composed of multiple lenses with different curvatures, refracts and converges the light emitted from the light source to achieve a focusing effect. The peripheral group is connected to the lens group via a threaded structure. When the peripheral assembly is rotated, it can change the relative distance between the lenses, thereby adjusting the position of the light convergence point and achieving focal length adjustment to meet the requirements of light focusing accuracy and range in different scenarios. A second housing 2 is connected to the first housing 1. A turntable 21 is rotatably installed inside the second housing 2. Three calibration plates 14 are installed on the turntable 21. A grating 15 is installed inside the calibration plate 14. The three calibration plates 14 are arranged in a circular array on the turntable 21. The grating 15 in each calibration plate 14 has different grating parameters and patterns. When the turntable 21 is rotated, different calibration plates 14 and their internal gratings 15 can be switched to the light propagation path. The grating 15 is used to diffract and split the light, so that the light shines on the object to be measured to form a pattern. Then, in conjunction with a vision camera, machine vision light source detection is achieved.

[0045] It also includes a switching component 3, which includes a knob 31, a gear 32, and a crown gear ring 33. The knob 31 is rotatably mounted on the first housing 1, the gear 32 is connected to the knob 31 and is located inside the first housing 1, and the crown gear ring 33 is mounted on the turntable 21 and meshes with the gear 32. A ratchet and pawl mechanism is provided inside the connection between the knob 31 and the first housing 1, so that the knob 31 can only rotate in one direction. When the operator rotates the knob 31, the knob 31 drives the gear 32 to rotate, and the gear 32 passes through... The crown gear ring 33 drives the turntable 21 to rotate, and the three calibration plates 14 on the turntable 21 rotate accordingly. When the turntable 21 rotates 120 degrees, the grating 15 originally located in the light channel inside the first housing 1 leaves the light channel, and the grating 15 in the next calibration plate 14 moves to the light channel, realizing the switching of calibration plate 14 and grating 15. According to the actual testing needs, the operator can switch different gratings 15 to the light channel inside the first housing 1 by rotating the knob 31 to meet different testing needs.

[0046] Furthermore, a triangular block 34 is connected to the calibration plate 14, and a positioning slider 35 is slidably installed inside the first housing 1. A spring is provided between the positioning slider 35 and the inner wall of the first housing 1. The positioning slider 35 has a V-shaped groove that matches the triangular block 34. When the calibration plate 14 is in the working position, the triangular block 34 above it is embedded in the V-shaped groove of the positioning slider 35. When the turntable 21 drives the calibration plate 14 to rotate to the working position, that is, when the grating 15 is in the light channel, the triangular block 34 on the calibration plate 14 will contact the V-shaped groove of the positioning slider 35. Then, the triangular block 34 uses its inclined surface to push the positioning slider 35 to compress the spring and slide. When the tip of the triangular block 34 begins to embed into the V-shaped groove of the positioning slider 35, the positioning slider 35 uses the elastic force of the spring to apply a pushing force to the triangular block 34, assisting the triangular block 34 to fully embed into the V-shaped groove. Even if the operator does not adjust the turntable 21 to the precise position using the knob 31, the positioning slider 35 can apply force to the triangular block 34 using the spring force, causing the triangular block 34 to drive the calibration plate 14 and the turntable 21 to continue rotating to adjust the position. When the triangular block 34 is fully embedded in the positioning slider 35, the turntable 21 also rotates to the precise position, so that the calibration plate 14 and the grating 15 to be used move to the precise working position. At the same time, the positioning slider 35 also continuously applies pressure to the triangular block 34 through the spring force, effectively preventing the turntable 21 from shifting due to vibration and other factors during operation, ensuring that the grating 15 is always in the correct working position, thereby ensuring the stability of the detection process. When the operator rotates the knob 31, they need to overcome the spring force first, so that the operator can feel whether the rotation is in place by hand.

[0047] Example 2

[0048] Based on Embodiment 1, after long-term use, fine dust may adhere to the surface of the grating 15, which will affect the diffraction and spectral dispersion of light, and ultimately affect the imaging effect, which may lead to misjudgment. This embodiment is invented to solve the above problems.

[0049] Please see Figure 1 , Figure 6 - Figure 10The second housing 2 is equipped with a purge assembly 4 for cleaning the grating 15 by purge. The purge assembly 4 includes a first airbag 41 and three second airbags 43. The first airbag 41 is installed on the top surface of the second housing 2, and the three second airbags 43 are installed on the inner wall of the second housing 2. Three air tubes 42 are connected to the first airbag 41, and the ends of the three air tubes 42 away from the first airbag 41 are respectively connected to the three second airbags 43. The first airbag 41 is made of elastic material and can expand after inflation, and then use its elasticity to expel the internal gas. The three second airbags 43 are also made of elastic material. When the second airbags 43 are squeezed, they can expel the internal gas and inject the gas into the first airbag 41 through the air tubes 42. The second airbags 43 can automatically reset after being released from the squeezed state. A one-way valve is provided in the air tubes 42 so that the gas can only flow from the second airbags 43 to the first airbags 41 through the air tubes 42. A purge pipe 45 is connected to the bottom, and the purge pipe 45 passes through the top of the second housing 2. A nozzle 46 is connected to the calibration plate 14. When the nozzle 46 moves, it can communicate with the purge pipe 45. A sealing block 47 is connected between two adjacent calibration plates 14. The three calibration plates 14 and the three sealing blocks 47 can seal the bottom of the purge pipe 45. An air outlet 48 is installed on the second housing 2. When the turntable 21 drives the calibration plate 14 to move below the purge pipe 45, the nozzle 46 on the calibration plate 14 communicates with the purge pipe 45, so that the gas in the first airbag 41 can enter the nozzle 46 through the purge pipe 45. The three calibration plates 14 and the three sealing blocks 47 form an annular sealing surface, which can seal the purge pipe 45. The three nozzles 46 are located on the annular sealing surface. When the nozzles 46 are not located below the purge pipe 45, the purge pipe 45 is completely blocked by the annular sealing surface, so that the gas in the first airbag 41 cannot be discharged.

[0050] In addition, the first airbag 41 and the second airbag 43 are respectively provided with elastic reset mechanisms. The turntable 21 has three slots, and the three second airbags 43 are respectively located in the three slots. When the turntable 21 moves, the edges of the slots can contact and compress the second airbags 43. Two air intake filters 44 are installed on the second airbags 43, and the air intake filters 44 protrude from the outer wall of the second housing 2. During the rotation of the turntable 21, the edges of the three slots squeeze the three second airbags 43 respectively, so that the three second airbags 43 are compressed, thereby allowing the three second airbags 43 to simultaneously inject gas through the air tubes 42. The first airbag 41 is inserted, and the length of the air tube 42 is determined by the distance between the second airbag 43 and the first airbag 41. When the turntable 21 rotates to the position, the three second airbags 43 are once again located in the three slots. The three second airbags 43 are reset using the elastic reset mechanism. When the second airbags 43 are reset, the air intake filter element 44 draws air from outside the second housing 2 into the second airbags 43 for replenishment. After the first airbag 41 is inflated after being inhaled, its internal elastic reset mechanism can enhance its reset elasticity, so that when the purge tube 45 can expel air, the gas in the first airbag 41 can be quickly expelled.

[0051] It is worth noting that the calibration plate 14 is provided with an exhaust groove. The gas ejected from the nozzle 46 can pass through the surface of the grating 15 and be discharged through the exhaust groove of the calibration plate 14. The gas discharged through the exhaust groove of the calibration plate 14 is discharged through the air outlet 48 and then discharged from the second housing 2. After the nozzle 46 discharges the gas, the gas blows away the fine dust adhering to the surface of the calibration plate 14 as it flows, so that the fine dust is discharged with the gas through the exhaust groove and the air outlet 48 of the calibration plate 14. Through the setting of the blowing assembly 4, when the switching assembly 3 switches the position of the three calibration plates 14, the first airbag 41 can be inflated and supplied with air through the blowing pipe 45 to the nozzle 46 on the calibration plate 14 below it, so that the nozzle 46 blows air to blow away the fine dust adhering to the surface of the calibration plate 14, thereby ensuring the cleanliness of the surface of the calibration plate 14 and avoiding the impact of dust on the detection accuracy.

[0052] Example 3

[0053] Based on Embodiment 2, during actual operation, the staff may not be clear about the specific positions of the three gratings 15. Therefore, when switching, it is necessary to start the light source module 13, observe and calculate, and then switch, which is a rather cumbersome operation. This embodiment was invented to solve the above problem.

[0054] Please see Figure 1 , Figure 11 - Figure 13The second housing 2 is provided with a display unit 5, which includes an indicator dial 51 and a pointer 56. The indicator dial 51 is mounted on the second housing 2, and a triangular wheel 55 is rotatably mounted on the second housing 2. The pointer 56 is mounted on the triangular wheel 55 and is located above the indicator dial 51. The indicator dial 51 is provided with three patterns, each corresponding to one of the three gratings 15. The pattern pointed to by the pointer 56 represents the grating 15 currently in the working position. One of the second airbags 43 is connected to a sliding shaft 52, which is slidably connected to the second housing 2. The connection position between the sliding shaft 52 and the second housing 2 is a groove type. The sliding shaft 52 is connected to... A connecting rod 53 is hinged to a lever 54. When the second airbag 43, connected to the sliding shaft 52, is compressed and reset, it causes the sliding shaft 52 to reciprocate once along its connection point with the second housing 2. This movement of the sliding shaft 52, via the connecting rod 53, causes the lever 54 to reciprocate once simultaneously. A reset mechanism is provided between the lever 54 and the connecting rod 53. The lever 54 can swing towards the sliding shaft 52, but cannot swing away from it. After swinging towards the sliding shaft 52, the lever 54 automatically resets using the reset mechanism. When the lever 54 moves towards the slide shaft 52, it contacts and drives the triangular wheel 55 to rotate 120 degrees. When the lever 54 moves away from the slide shaft 52, it is pushed by the triangular wheel 55 and oscillates. During one reciprocating motion, the lever 54 first moves towards the slide shaft 52 and then moves away from the slide shaft 52. The triangular wheel 55 is triangular star-shaped, with three prongs arranged in a circular array above it. When the lever 54 moves towards the slide shaft 52, it contacts one of the prongs and drives the triangular wheel 55 to rotate 120 degrees. When the lever 54 moves away from the slide shaft 52, the lever 54... It will contact another fork, but will be pushed by the fork and swing towards the slide shaft 52. Then the lever 54 will slide along the end of the fork until it disengages from the fork. During this process, the lever 54 does not drive the triangular wheel 55 to rotate. Therefore, during one reciprocating motion, the lever 54 can drive the triangular wheel 55 to rotate 120 degrees in one direction. When the triangular wheel 55 rotates, it can drive the pointer 56 to rotate, so that the pointer 56 moves to the corresponding pattern on the indicator dial 51, thereby indicating the current working position of the grating 15. This makes it easier for the operator to distinguish the specific position information of the current grating 15 when switching gratings 15.

[0055] It is worth noting that the first housing 1 is provided with a dust removal part 6, which includes a cleaning rod 62. The cleaning rod 62 is rotatably mounted on the first housing 1. A protruding rod 63 is connected to the cleaning rod 62, and a lever relationship is formed between the cleaning rod 62 and the protruding rod 63. When the protruding rod 63 swings, it will drive the cleaning rod 62 to swing in the opposite direction. A pull rod 61 is connected to the connecting rod 53. An elastic rod 64 is connected between the protruding rod 63 and the pull rod 61. The elastic rod 64 has elastic deformation capability. When the protruding rod 63 moves, it can drive the cleaning rod 62 to swing. When the cleaning rod 62 swings, it contacts the surface of the lens 11. When the connecting rod 53 moves back and forth, it drives the elastic rod 64 to move back and forth through the pull rod 61. When the elastic rod 64 moves back and forth, it can drive the cleaning rod 62 to swing back and forth once through the protruding rod 63. When the cleaning rod 62 swings back and forth, it wipes the lens 11 to remove dust from the surface of the lens 11 and avoids affecting the imaging effect. During operation, the cleaning rod 62 does not block the light channel of the lens 11.

[0056] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An adjustable focused grating point light source, characterized by, Include: The first shell (1) is internally mounted with a light source module (13), the top end of the first shell (1) is connected with a heat dissipation seat (12), the bottom end of the first shell (1) is connected with a lens (11); The first shell (1) is connected with a second shell (2), the second shell (2) is rotatably mounted with a rotating disc (21), the rotating disc (21) is mounted with three calibration plates (14), the calibration plate (14) is mounted with a grating (15); It also includes a switching assembly (3), the switching assembly (3) includes a knob (31), a gear (32) and a crown gear ring (33), the knob (31) is rotatably installed on the first shell (1), the gear (32) is connected on the knob (31), the gear (32) is located in the first shell (1), the crown gear ring (33) is installed on the rotating disc (21), the crown gear ring (33) is engaged with the gear (32); The second shell (2) is provided with a blowing assembly (4) for cleaning the grating (15) by blowing; The calibration plate (14) is connected with a triangular block (34), the first shell (1) is slidably mounted with a positioning sliding block (35), the positioning sliding block (35) and the inner wall of the first shell (1) are provided with a spring, the positioning sliding block (35) is provided with a V-shaped groove matched with the triangular block (34), when the calibration plate (14) is located at the working position, the triangular block (34) above it is embedded in the V-shaped groove of the positioning sliding block (35).

2. An adjustable focused grating point light source as claimed in claim 1, characterized in that: The light source module (13) includes a light source, a lens group and a circle group, the focal length of the lens group can be adjusted by rotating the circle group.

3. The adjustable focused grating point light source of claim 1, wherein: The blowing assembly (4) includes a first air bag (41) and three second air bags (43), the first air bag (41) is installed on the top surface of the second shell (2), the three second air bags (43) are all installed on the inner wall of the second shell (2), the first air bag (41) is connected with three air tubes (42), the ends of the three air tubes (42) away from the first air bag (41) are respectively connected with the three second air bags (43), the bottom of the first air bag (41) is connected with a blowing pipe (45), the blowing pipe (45) penetrates through the top of the second shell (2), the calibration plate (14) is connected with a nozzle (46), the nozzle (46) can be communicated with the blowing pipe (45) when moving, the adjacent two calibration plates (14) are connected with a sealing block (47), the three calibration plates (14) and the three sealing blocks (47) can block the bottom of the blowing pipe (45), the second shell (2) is installed with an air outlet window (48).

4. An adjustable focused grating point light source as claimed in claim 3, characterized in that: The first air bag (41) and the second air bag (43) are respectively provided with elastic reset mechanisms, three notches are formed in the rotating disc (21), the three second air bags (43) are respectively located in the three notches, the edges of the notches can contact and compress the second air bags (43) when moving, two air inlet filters (44) are installed on the second air bags (43), and the air inlet filters (44) protrude from the outer wall of the second shell (2).

5. An adjustable focused grating point light source as claimed in claim 4, characterized in that: An exhaust groove is formed in the calibration plate (14), the gas sprayed by the nozzle (46) can pass through the surface of the grating (15) and be discharged through the exhaust groove of the calibration plate (14), and the gas discharged through the exhaust groove of the calibration plate (14) is discharged out of the second shell (2) through the air outlet window (48).

6. The adjustable focused grating point light source of claim 4, wherein: A display part (5) is arranged on the second shell (2), the display part (5) comprises an indicating disc (51) and a pointer (56), the indicating disc (51) is installed on the second shell (2), a triangular wheel (55) is rotatably arranged on the second shell (2), the pointer (56) is installed on the triangular wheel (55), and the pointer (56) is located above the indicating disc (51), one of the second air bags (43) is connected with a sliding shaft (52), the sliding shaft (52) is slidably connected with the second shell (2), a connecting rod (53) is connected with the sliding shaft (52), and a lever (54) is hingedly connected with the connecting rod (53).

7. An adjustable focused grating point light source as claimed in claim 6, characterized in that: A reset mechanism is arranged between the lever (54) and the connecting rod (53), when the lever (54) moves towards the sliding shaft (52), the lever (54) can contact and drive the triangular wheel (55) to rotate by 120 degrees, and when the lever (54) moves away from the sliding shaft (52), the lever (54) swings under the counter thrust of the triangular wheel (55).

8. An adjustable focused grating point light source as claimed in claim 7, characterized in that: A dust cleaning part (6) is arranged on the first shell (1), the dust cleaning part (6) comprises a cleaning rod (62), the cleaning rod (62) is rotatably arranged on the first shell (1), a convex rod (63) is connected with the cleaning rod (62), a pull rod (61) is connected with the connecting rod (53), and an elastic rod (64) is connected between the convex rod (63) and the pull rod (61). When the convex rod (63) moves, the cleaning rod (62) can be swung, and the cleaning rod (62) contacts the surface of the lens (11) when swinging.

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