Adjustable focusing grating point light source

Abstract

The invention relates to the technical field of machine vision light source detection, and discloses an adjustable focusing grating point light source which comprises a first shell, a second shell and a light source module, and the first shell is internally provided with the light source module; the first shell is connected with a second shell, a turntable is rotatably mounted in the second shell, three calibration plates are mounted on the turntable, and gratings are mounted in the calibration plates; the switching assembly comprises a knob, a gear and a crown gear ring; and a purging assembly is arranged on the second shell and is used for cleaning the grating in a purging manner. Through the arrangement of the switching assembly, a worker can drive the rotary table to rotate by rotating the rotary knob, then the three calibration plates provided with the optical gratings are driven to switch positions, different optical gratings are switched to the light channels in the first shell, different detection requirements are met, operation is convenient, and switching efficiency is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of machine vision light source detection, and particularly relates to an adjustable focusing grating point light source. BACKGROUND

[0002] The grating point light source is an optical device for modulating the light source through the grating structure to realize a specific light field distribution, which is mainly composed of a light source module, a grating assembly, an optical lens group and a supporting and fixing structure. The light source module usually adopts LED chips, laser diodes and the like as the light-emitting core to provide high-brightness and narrow-spectrum initial light sources. The grating assembly is usually a periodic arrangement of microstructure elements, and common types include rectangular gratings, sinusoidal gratings and blazed gratings. The gratings are prepared by processes such as photolithography and nanoimprinting, and can diffract, split or condense incident light for modulation. The optical lens group is generally composed of collimating lenses, focusing lenses and the like to optimize the directionality and uniformity of the outgoing light. The existing technology can combine the cooperation of a vision camera and a grating point light source for machine vision light source detection, which is commonly used in defect detection. In actual operation, the grating point light source projects an image on the object to be detected, and then the vision camera collects image information. When a defect point occurs, an image abnormal point is directly generated. By analyzing the abnormal points of the image information by the detection host, the defect detection result can be obtained.

[0003] However, the existing technology has the following problems: Most of the existing grating point light sources are equipped with a single type of grating. Since some detection scenes may need to detect a variety of different objects to be detected, such as flat, spherical and irregular objects, the requirements for grating imaging patterns are also different. This requires workers to equip multiple light sources according to actual requirements, and to disassemble and replace the light sources according to the use requirements during detection, which is more troublesome to operate. SUMMARY

[0004] The purpose of the present application is to provide an adjustable focusing grating point light source to solve the above problems and overcome the defects of the prior art, as described in detail below.

[0005] To achieve the above purpose, the present application provides the following technical solutions: The application provides an adjustable focusing grating point light source, which comprises a first shell, a light source module is arranged in the first shell, a heat dissipation base is connected to the top end of the first shell, and a lens is connected to the bottom end of the first shell; a second shell is connected to the first shell, a rotating disc is rotatably arranged in the second shell, three calibration plates are arranged on the rotating disc, and gratings are arranged in the calibration plates; the adjustable focusing grating point light source further comprises a switching assembly, the switching assembly comprises a knob, a gear and a crown gear ring, the knob is rotatably arranged on the first shell, the gear is connected to the knob, the gear is arranged in the first shell, the crown gear ring is arranged on the rotating disc, and the crown gear ring is engaged with the gear; and a blowing assembly is arranged on the second shell and used for cleaning the gratings by blowing.

[0006] Preferably, the light source module comprises a light source, a lens group and a ring group, and the focal length of the lens group can be adjusted by rotating the ring group.

[0007] Preferably, a triangular block is connected to the calibration plate, a positioning sliding block is slidably arranged in the first shell, a spring is arranged between the positioning sliding block and the inner wall of the first shell, a V-shaped groove matched with the triangular block is formed in the positioning sliding block, and when the calibration plate is in a working position, the triangular block above the calibration plate is embedded in the V-shaped groove of the positioning sliding block.

[0008] Preferably, the blowing assembly comprises a first air bag and three second air bags, the first air bag is arranged on the top surface of the second shell, the three second air bags are arranged on the inner wall of the second shell, three air pipes are connected to the first air bag, the ends of the three air pipes away from the first air bag are connected to the three second air bags respectively, a blowing pipe is connected to the bottom of the first air bag, the blowing pipe penetrates through the top of the second shell, a nozzle is connected to the calibration plate, the nozzle can be communicated with the blowing pipe when the nozzle moves, a sealing block is arranged between two adjacent calibration plates, the three calibration plates and the three sealing blocks can block the bottom of the blowing pipe, and an air outlet window is arranged on the second shell.

[0009] Preferably, elastic return mechanisms are arranged in the first air bag and the second air bags respectively, three grooves are formed in the rotating disc, the three second air bags are arranged in the three grooves respectively, the edges of the grooves can contact and compress the second air bags when the edges move, two air inlet filters are arranged on the second air bag, and the air inlet filters protrude from the outer wall of the second shell.

[0010] Preferably, an exhaust groove is formed in the calibration plate, the gas sprayed by the nozzle can pass through the surface of the grating and be discharged through the exhaust groove of the calibration plate, and the gas discharged through the exhaust groove of the calibration plate is discharged from the second shell through the air outlet window.

[0011] As preferred, the second shell is provided with a display part, the display part comprises an indicating disc and a pointer, the indicating disc is installed on the second shell, a triangular wheel is rotatably installed on the second shell, the pointer is installed on the triangular wheel and located above the indicating disc, one of the second air bags is connected with a sliding shaft, the sliding shaft is slidably connected with the second shell, the sliding shaft is connected with a connecting rod, and the connecting rod is hingedly connected with a lever.

[0012] As preferred, a reset mechanism is arranged between the lever and the connecting rod, the lever can contact and drive the triangular wheel to rotate by 120 degrees when moving towards the sliding shaft, and the lever swings when moving away from the sliding shaft due to the counterforce of the triangular wheel.

[0013] As preferred, the first shell is provided with a dust cleaning part, the dust cleaning part comprises a cleaning rod, the cleaning rod is rotatably installed on the first shell, the cleaning rod is connected with a convex rod, the connecting rod is connected with a pull rod, and the convex rod and the pull rod are connected with an elastic rod, the convex rod can drive the cleaning rod to swing when moving, and the cleaning rod contacts the lens surface when swinging.

[0014] The beneficial effects are that: 1. The adjustable focusing grating point light source, through the setting of the switching assembly, enables the staff to drive the rotating disc to rotate by rotating the knob, thereby driving the three calibration plates with gratings to switch positions, and then switching different gratings to the light channel in the first shell to meet different detection needs, which is convenient to operate and has high switching efficiency. The cooperation of the positioning sliding block and the triangular block enables the positioning sliding block to press the triangular block through the elastic force of the spring, which ensures the switching accuracy and avoids the deviation of the rotating disc due to vibration and other factors during work, ensures that the grating is always in the correct working position, and ensures the stability during detection.

[0015] 2. The adjustable focusing grating point light source, through the setting of the blowing assembly, enables the first air bag to inflate when the switching assembly switches the positions of the three calibration plates, and supplies air to the nozzles on the calibration plate below through the blowing pipe, so that the nozzles blow air to blow away the fine dust attached to the surface of the calibration plate, thereby ensuring the cleanliness of the surface of the calibration plate and avoiding the influence of dust on detection accuracy.

[0016] 3. The adjustable focusing grating point light source, through the setting of the display part, enables the pointer to move to the pattern corresponding to the working position of the grating on the indicating disc, thereby indicating the current grating located in the working position, which is convenient for the staff to distinguish the specific position information of the current grating when switching the grating. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments or prior art description. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative effort.

[0018] Figure 1 is a schematic diagram of the overall structure of the present application; Figure 2 is a schematic diagram of the first shell structure of the present application; Figure 3 is a schematic diagram of the second shell structure of the present application; Figure 4 is a schematic diagram of the switching assembly structure of the present application; Figure 5 is a schematic diagram of the positioning slider structure of the present application; Figure 6 is a schematic diagram of the purging assembly structure of the present application; Figure 7 is a schematic diagram of the first air bag structure of the present application; Figure 8 is a schematic diagram of the nozzle structure of the present application; Figure 9 is a schematic diagram of the second air bag structure of the present application; Figure 10 is a schematic diagram of the exhaust window structure of the present application; Figure 11 is a schematic diagram of the display part structure of the present application; Figure 12 is a schematic diagram of the triangular wheel structure of the present application; Figure 13 is a schematic diagram of the ash removal part structure of the present application.

[0019] The following is a description of the reference signs: 1, first shell; 11, lens; 12, heat dissipation seat; 13, light source module; 14, calibration plate; 15, grating; 2, second shell; 21, rotating disc; 3, switching assembly; 31, knob; 32, gear; 33, crown tooth ring; 34, triangular block; 35, positioning slider; 4, purging assembly; 41, first air bag; 42, air pipe; 43, second air bag; 44, air inlet filter element; 45, purging pipe; 46, nozzle; 47, sealing block; 48, air outlet window; 5, display part; 51, indicator disc; 52, sliding shaft; 53, connecting rod; 54, lever; 55, triangular wheel; 56, pointer; 6, ash removal part; 61, pull rod; 62, cleaning rod; 63, convex rod; 64, elastic rod. DETAILED DESCRIPTION

[0020] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described in detail below. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present application.

[0021] Embodiment 1 Most of the existing grating point light sources are equipped with a single type of grating. Since part of the detection scene may need to detect a plurality of different to-be-detected objects, for example, when detecting flat, spherical and irregular objects, the requirements for the grating imaging pattern are also different, which makes the staff need to equip multiple light sources according to the actual requirements, and disassemble and replace the light source according to the use demand during detection, which is more troublesome to operate. In order to solve the above problems, the present embodiment is invented.

[0022] Please refer to Figure 1 Figure 5 An adjustable focusing grating point light source, comprising: a first shell 1, a light source module 13 is installed inside the first shell 1, a heat dissipation seat 12 is connected to the top end of the first shell 1, and a lens 11 is connected to the bottom end of the first shell 1. The light source module 13 generates heat during operation, the heat dissipation seat 12 quickly absorbs heat through metal heat conduction material and dissipates it outward, avoiding performance degradation or damage of the light source module 13 due to high temperature, and the lens 11 is a transparent flat lens, which plays a dustproof and protective role; the light source module 13 comprises a light source, a lens group and a ring group, the focal length of the lens group can be adjusted by rotating the ring group, the light source is used to provide a light source, the lens group is composed of multiple lenses with different curvatures, and is used to refract and converge the light emitted by the light source, thereby realizing focusing effect, and the ring group is connected with the lens group through a threaded structure, when the ring group is rotated, the ring group can change the relative distance between the lenses, thereby adjusting the position of the light convergence point, realizing focal length adjustment, and meeting the requirements of light focusing accuracy and range in different scenes; a second shell 2 is connected to the first shell 1, a turntable 21 is rotatably installed in the second shell 2, three calibration plates 14 are installed on the turntable 21, gratings 15 are installed in the calibration plates 14, and the three calibration plates 14 are distributed in a circumferential array on the turntable 21. Each grating 15 in the 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 gratings 15 are used for diffraction and light splitting of light, so that the light is irradiated on the object to be detected to form a pattern, and then a visual camera is used to realize machine vision light source detection. ​

[0023] The switching assembly 3 comprises 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 to the knob 31 and located inside the first shell 1. The crown gear ring 33 is installed on the rotating disc 21 and engages with the gear 32. A ratchet and pawl mechanism is arranged inside the connection between the knob 31 and the first shell 1, so that the knob 31 can only rotate in one direction. When the knob 31 is rotated by the operator, the knob 31 drives the gear 32 to rotate, and the gear 32 drives the rotating disc 21 to rotate through the crown gear ring 33. The three calibration plates 14 on the rotating disc 21 rotate accordingly. When the rotating disc 21 rotates by one hundred and twenty degrees, the original grating 15 on the light channel inside the first shell 1 moves away from the light channel, and the next grating 15 in the calibration plate 14 moves to the light channel. The switching of the calibration plate 14 and the grating 15 is realized. The operator can switch different gratings 15 to the light channel in the first shell 1 by rotating the knob 31 to meet different detection requirements.

[0024] Further, the calibration plate 14 is connected with a triangular block 34, and a positioning sliding block 35 is slidably installed in the first shell 1. A spring is arranged between the positioning sliding block 35 and the inner wall of the first shell 1. A V-shaped groove matching the triangular block 34 is formed in the positioning sliding block 35. 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 sliding block 35. When the rotating disc 21 drives the calibration plate 14 to rotate to the working position, i.e., the grating 15 is located in the light channel, the triangular block 34 on the calibration plate 14 will contact the V-shaped groove of the positioning sliding block 35. Then, the triangular block 34 pushes the positioning sliding block 35 to compress the spring and slide by using its inclined surface. When the tip of the triangular block 34 starts to embed in the V-shaped groove of the positioning sliding block 35, the positioning sliding block 35 applies a pushing force to the triangular block 34 by the elastic force of the spring, assisting the triangular block 34 to completely embed in the V-shaped groove. At this time, even if the operator does not adjust the rotating disc 21 to the exact position by the knob 31, the positioning sliding block 35 can apply a force to the triangular block 34 by the elastic force of the spring, so that the triangular block 34 drives the calibration plate 14 and the rotating disc 21 to continue to rotate to adjust the position. When the triangular block 34 completely embeds in the positioning sliding block 35, the rotating disc 21 also rotates to the exact position, so that the calibration plate 14 and the grating 15 to be used move to the accurate working position. At the same time, the positioning sliding block 35 continuously applies pressure to the triangular block 34 by the elastic force of the spring, effectively avoiding the deviation of the rotating disc 21 due to vibration and other factors during work, ensuring that the grating 15 is always in the correct working position, and further ensuring the stability during detection. When the operator rotates the knob 31, the operator needs to overcome the elastic force of the spring first, so that the operator can feel whether the switching is rotated to the correct position by hand feeling.

[0025] Example 2 On the basis of embodiment 1, the surface of the grating 15 can be attached with fine dust after long-term use, thereby affecting the diffraction and light splitting effect of light, ultimately affecting the imaging effect, which may lead to false detection. In order to solve the above problems, the present embodiment is invented.

[0026] Please refer to Figure 1 、 Figure 6 - Figure 10 The second shell 2 is provided with a blowing assembly 4 for cleaning the grating 15 by blowing. 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, and the three second air bags 43 are installed on the inner wall of the second shell 2. Three air tubes 42 are connected to the first air bag 41, and the ends of the three air tubes 42 away from the first air bag 41 are connected to the three second air bags 43, respectively. The first air bag 41 is made of elastic material and can expand after inflation, and then use its elastic force to discharge the internal gas. The three second air bags 43 are also made of elastic material and can discharge internal gas when being pressed and inject gas into the first air bag 41 through the air tube 42. The second air bag 43 can reset itself after being released from the pressed state. A one-way valve is provided in the air tube 42, so that the gas can only flow from the second air bag 43 to the first air bag 41 through the air tube 42 in one direction. The bottom of the first air bag 41 is connected to a blowing pipe 45 which penetrates through the top of the second shell 2. A nozzle 46 is connected to the calibration plate 14, and the nozzle 46 can communicate with the blowing pipe 45 when moving. A sealing block 47 is connected between two adjacent calibration plates 14. The three calibration plates 14 and the three sealing blocks 47 can block the bottom of the blowing pipe 45. An air outlet window 48 is installed on the second shell 2. When the calibration plate 14 is moved to below the blowing pipe 45 by the rotating disc 21, the nozzle 46 on the calibration plate 14 communicates with the blowing pipe 45, so that the gas in the first air bag 41 can enter the nozzle 46 through the blowing pipe 45. The three calibration plates 14 and the three sealing blocks 47 form an annular sealing surface which can block the blowing pipe 45. The three nozzles 46 are located on the annular sealing surface. When the nozzle 46 is not located below the blowing pipe 45, the blowing pipe 45 is completely blocked by the annular sealing surface, so that the gas in the first air bag 41 cannot be discharged.

[0027] In addition, the first air bag 41 and the second air bag 43 are respectively provided with elastic reset mechanisms, the rotating disc 21 is provided with three notches, 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, the second air bags 43 are provided with two air inlet filters 44, the air inlet filters 44 protrude from the outer wall of the second shell 2; during the rotation of the rotating disc 21, the edges of the three notches respectively extrude the three second air bags 43, so that the three second air bags 43 are compressed, thereby causing the three second air bags 43 to simultaneously inject gas into the first air bag 41 through the air pipes 42, the length of the air pipe 42 is determined by the distance between the second air bag 43 and the first air bag 41, when the rotating disc 21 is rotated to the position, the three second air bags 43 are located in the three notches again, the three second air bags 43 are reset by the elastic reset mechanisms, when the second air bag 43 is reset, the air inlet filter 44 is used to suck the air outside the second shell 2 into the second air bag 43 for replenishment, and after the first air bag 41 is filled with air, it begins to expand, and the elastic reset mechanism inside the first air bag 41 can increase the elastic force of the reset, so that when the blowing pipe 45 can discharge air, the gas in the first air bag 41 can be quickly discharged.

[0028] Notably, the calibration plate 14 is provided with an exhaust groove, 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, the gas discharged through the exhaust groove of the calibration plate 14 is discharged from the second shell 2 through the air outlet window 48; after the nozzle 46 discharges the gas, the gas blows the fine dust attached to the surface of the calibration plate 14 when flowing, so that the fine dust is discharged with the gas through the exhaust groove of the calibration plate 14 and the air outlet window 48, through the arrangement of the blowing assembly 4, when the switching assembly 3 switches the positions of the three calibration plates 14, the first air bag 41 can be inflated by filling air, and the blowing pipe 45 supplies air to the nozzle 46 on the calibration plate 14 below, so that the nozzle 46 sprays gas to blow the fine dust attached to the surface of the calibration plate 14, thereby ensuring the cleanliness of the surface of the calibration plate 14 and avoiding the influence of dust on the detection accuracy.

[0029] Embodiment 3 On the basis of embodiment 2, the staff may not know the specific positions of the three gratings 15 during actual operation, so when switching, the light source module 13 needs to be started, and then the switching is performed by observation and calculation, which is relatively cumbersome. To solve the above problem, this embodiment is invented.

[0030] Please refer to Figure 1 、 Figure 11 - Figure 13The second shell 2 is provided with a display part 5, the display part 5 comprises an indicating disc 51 and a pointer 56, the indicating disc 51 is installed on the second shell 2, the second shell 2 is rotatably provided with a triangular wheel 55, the pointer 56 is installed on the triangular wheel 55, the pointer 56 is located above the indicating disc 51, the indicating disc 51 is provided with three patterns corresponding to the three gratings 15 respectively, the pattern pointed by the pointer 56 represents the grating 15 currently located at the working position, 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, the connecting position of the sliding shaft 52 with the second shell 2 is in the form of a sliding groove, the sliding shaft 52 is connected with a connecting rod 53, the connecting rod 53 is hingedly connected with a lever 54, when the second air bag 43 connected with the sliding shaft 52 is compressed and reset, the sliding shaft 52 is driven to reciprocate along the connecting position with the second shell 2, so that the sliding shaft 52 drives the lever 54 to reciprocate synchronously through the connecting rod 53; the lever 54 and the connecting rod 53 are provided with a reset mechanism, the lever 54 can swing towards the sliding shaft 52, but the lever 54 cannot swing away from the sliding shaft 52, after the lever 54 swings towards the sliding shaft 52, the lever 54 can be automatically reset by the reset mechanism, when the lever 54 moves towards the sliding shaft 52, the lever 54 can contact and drive the triangular wheel 55 to rotate 120 degrees, when the lever 54 moves away from the sliding shaft 52, the lever 54 swings due to the counterforce of the triangular wheel 55, during one reciprocating motion of the lever 54, the lever 54 moves towards the sliding shaft 52 first, and then moves away from the sliding shaft 52, the triangular wheel 55 is in the form of a triangular star, three fork rods are arranged in the circumferential direction above the triangular wheel 55, when the lever 54 moves towards the sliding shaft 52, the lever 54 can contact one of the fork rods and drive the triangular wheel 55 to rotate 120 degrees, when the lever 54 moves away from the sliding shaft 52, the lever 54 contacts another fork rod, but swings towards the sliding shaft 52 due to the counterforce of the fork rod, then the lever 54 slides along the end of the fork rod until the lever 54 is separated from the fork rod, during the process, the lever 54 does not drive the triangular wheel 55 to rotate, therefore, during one reciprocating motion of the lever 54, the lever 54 can drive the triangular wheel 55 to rotate 120 degrees in one direction, when the triangular wheel 55 rotates, the triangular wheel 55 can drive the pointer 56 to rotate, so that the pointer 56 moves to the pattern on the indicating disc 51 corresponding to the pattern, thereby indicating the grating 15 currently located at the working position, which is convenient for the staff to distinguish the specific position information of the grating 15 when the gratings 15 are switched.

[0031] It is worth mentioning that the first shell 1 is provided with a dust cleaning part 6, the dust cleaning part 6 comprises a cleaning rod 62, the cleaning rod 62 is rotatably installed on the first shell 1, a convex rod 63 is connected to the cleaning rod 62, a lever relationship is formed between the cleaning rod 62 and the convex rod 63, the convex rod 63 swings to 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 convex rod 63 and the pull rod 61, the elastic rod 64 has elastic deformation capacity, the convex rod 63 moves to drive the cleaning rod 62 to swing, the cleaning rod 62 swings to contact the surface of the lens 11; the connecting rod 53 reciprocatingly moves to drive the elastic rod 64 to reciprocatingly move through the pull rod 61, the elastic rod 64 reciprocatingly moves to drive the cleaning rod 62 to swing once through the convex rod 63, the cleaning rod 62 wipes the lens 11 when reciprocatingly swinging to remove the dust on the surface of the lens 11, and the imaging effect is avoided from being affected, and the cleaning rod 62 does not block the light channel of the lens 11 during operation.

[0032] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection 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.

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 calibration plate (14) is connected with a triangular block (34), a positioning sliding block (35) is slidably installed in the first shell (1), a spring is arranged between the positioning sliding block (35) and the inner wall of the first shell (1), a V-shaped groove matched with the triangular block (34) is formed in the positioning sliding block (35), when the calibration plate (14) is in the working position, the triangular block (34) above the calibration plate (14) is embedded in the V-shaped groove of the positioning sliding block (35).

4. 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, 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).

5. An adjustable focused grating point light source as claimed in claim 4, 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).

6. An adjustable focused grating point light source as claimed in claim 5, 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).

7. The adjustable focused grating point light source of claim 5, 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 installed 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).

8. An adjustable focused grating point light source as claimed in claim 7, 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).

9. An adjustable focused grating point light source as claimed in claim 8, 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 installed 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 when the cleaning rod (62) swings, the cleaning rod (62) contacts the surface of the lens (11).

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