High-precision infrared thermal imaging single-lens glasses device

Abstract

The invention relates to a high-precision infrared thermal imaging single-lens glasses device, which comprises an infrared thermal imaging single-lens glasses main body and an infrared thermal imaging device which are arranged on a glasses frame, one side of the infrared thermal imaging single-lens glasses main body is provided with a plurality of layers of protective films, and the glasses frame is provided with a film tearing structure; the film tearing structure comprises a groove formed in the glasses frame, the groove is used for containing a non-sticking area of the multi-layer protective film, a positioning column matched with a positioning hole of the non-sticking area is arranged on the bottom wall of the groove, and limiting supporting feet are arranged on the edge of the groove and used for limiting the edge area of the multi-layer non-sticking area. According to the infrared thermal imaging single-lens glasses, the multiple layers of protective films are arranged on the side wall of the infrared thermal imaging single-lens glasses main body, when the infrared thermal imaging single-lens glasses are used in a severe environment and the outermost protective film is attached by dust to reduce the definition, the outermost protective film can be torn off through the film tearing structure, and at the moment, the infrared thermal imaging single-lens glasses main body can be protected by using other protective films.

Description

Technical Field

[0001] The invention relates to the technical field of glasses, and in particular to a high-precision infrared thermal imaging single-piece glasses device. Background Art

[0002] Infrared glasses are a type of smart glasses that use infrared technology to achieve special functions and are widely used in military, security, medical, scientific research and other fields. The core principle is to capture infrared radiation emitted by objects through infrared sensors and convert them into visible light images, thereby providing clear visual information in low-light or no-light environments.

[0003] For example, the "infrared video display glasses" disclosed in patent publication number CN105247861B, the transparent display is positioned in the field of view of the user when the display device is worn; the stereoscopic video camera device includes a camera, the camera captures the reflected infrared light image of the surrounding environment; the projection system receives the infrared light image from the stereoscopic camera device, and projects the first infrared-illuminated video image in real time on the left eye viewport portion of the transparent display overlapping with the user's left eye field of view, and projects the second infrared-illuminated video image in real time on the right eye viewport portion of the transparent display overlapping with the user's right eye field of view; However, in dusty environments, frequent sandstorms, or industrial dust environments, infrared glasses are extremely susceptible to dust adhesion, which greatly affects the clarity of the view. Summary of the invention

[0004] In view of the deficiencies of the prior art, the present invention provides a high-precision infrared thermal imaging monocle device to solve the above problems.

[0005] The present invention provides the following technical solutions: A high-precision infrared thermal imaging monocle device, comprising an infrared thermal imaging monocle body and an infrared thermal imaging device arranged on a glasses frame, wherein a multi-layer protective film is arranged on one side of the infrared thermal imaging monocle body, and a film tearing structure is arranged on the glasses frame; The film tearing structure includes a groove opened on the eyeglass frame, the groove is used to accommodate the non-adhesive area of ​​the multiple layers of the protective film, the bottom wall of the groove is provided with a positioning column adapted to the positioning hole of the non-adhesive area, and the edge of the groove is provided with a limiting support foot, and the limiting support foot is used to limit the edge area of ​​the multiple layers of the non-adhesive area.

[0006] Preferably, an oblique push block is slidably connected in the groove, and a push rod extending to the outside of the groove is provided on the oblique push block. The oblique push block is reset by a reset spring, and an elastic sheet is provided on the bottom wall of the groove. The elastic force of the elastic sheet pushes the non-adhesive area of ​​the multiple layers toward the limiting support foot.

[0007] Preferably, a rotating shaft is rotatably connected in the groove, the limiting support foot is arranged on the rotating shaft, a gear is coaxially connected to the rotating shaft, a rack is arranged on the inclined push block, the rack is meshed with the gear, and the push rod and the inclined push block are slidably matched along the axial direction of the rotating shaft.

[0008] Preferably, the inner wall of the groove is provided with a guide groove inclined with respect to the moving direction of the push block, and the rack is provided with a guide column moving in the guide groove.

[0009] Preferably, the inclined surface of the oblique push block close to the non-adhesive area of ​​the multiple layers is provided with an avoidance groove.

[0010] Preferably, a friction layer is provided on the side of the limiting support leg in contact with the non-adhesive area.

[0011] Preferably, limiting support feet are provided on opposite sides of the non-adhesive area, and the movement of the oblique push block drives the limiting support feet on the opposite sides to rotate to different angles.

[0012] Preferably, the non-adhesive area of ​​the protective film includes a first film portion and a second film portion, the first film portion is provided with a card slot, the second film portion is provided with an inserting portion that is inserted and matched with the card slot, and the inserting portion is an arc-shaped structure.

[0013] Preferably, it also includes a control box, which is connected to the infrared thermal imaging monocle main body and the infrared thermal imaging device through a connecting line, a control panel is arranged on the front of the control box, and an arm strap is installed on the back of the control box.

[0014] Preferably, glasses fixing strips are provided on both sides of the glasses frame, the rear end of the glasses fixing strip is internally threadedly connected with a first threaded rod, the rear end of the first threaded rod is fixedly mounted with glasses legs, the outer surface of the first threaded rod is threadedly connected with a stabilizing frame, a slider is fixedly mounted on the stabilizing frame, the rear end of the glasses fixing strip is fixedly mounted with a first sliding rod, the first sliding rod and a straight line pass through the slider, and the free end of the first sliding rod is fixedly mounted with a limiting plate.

[0015] The present invention has the following beneficial technical effects: The present invention arranges a multi-layer protective film on the side wall of the infrared thermal imaging monocle main body. When used in a harsh environment, when the outermost protective film is attached with dust and the clarity is reduced, the outermost protective film can be torn off by a film tearing structure. At this time, the infrared thermal imaging monocle main body can also be protected by other protective films.

[0016] The first slide bar provides a stable moving path for the slider, so that when adjusting the position of the glasses leg, it can remain stable and avoid shaking or deviation from the predetermined path. By rotating the first threaded rod, the user can easily adjust the distance between the glasses leg and the glasses fixing bar. This setting allows users to make personalized adjustments based on their face shape, comfort or wearing needs. The setting of the stabilizer frame not only helps to maintain the integrity of the glasses structure, but also disperses the pressure during the adjustment process, reduces the wear of a single component, and thus prolongs the service life.

[0017] By setting up the arm strap, the control box can be firmly fixed on the user's arm, effectively preventing the control box from shaking or slipping during use; this stability is particularly important for tasks that require long-term or high-intensity monitoring, and can ensure the accuracy and reliability of the data; through the fixation of the arm strap, the user can more easily carry and move the control box, the infrared thermal imaging monocle body and the glasses frame; this not only improves the portability of the equipment, but also makes the user more flexible when monitoring outdoors or in complex environments; the setting of the arm strap allows the user to free his hands without holding the control box, the infrared thermal imaging monocle body and the glasses frame, thereby improving work efficiency; at the same time, this fixing method also reduces the interference of the control box on the user's activities. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 yes Figure 1 Schematic diagram of the local A enlarged structure; Figure 3 It is a schematic diagram of the cooperation between the multi-layer protective film and the film tearing structure of the present invention; Figure 4 It is a schematic diagram of the film tearing structure of the present invention; Figure 5 is a schematic diagram of the protective film of the present invention; Figure 6 This is a schematic diagram of the coordination of the position-limiting support foot, the rack, and the rotating shaft of the present invention; Figure 7 is a schematic diagram of the structure of the first membrane portion of the present invention; Figure 8 is a schematic diagram of the structure of the second membrane portion of the present invention; Fig. 9 The present invention is a schematic diagram of the cooperation between the eyeglass fixing strip and the eyeglass legs.

[0019] The reference numerals in the figure are: 2. Infrared thermal imaging monocle main body; 3. Connecting wire; 4. Control panel; 5. Control box; 6. First slide bar; 7. Arm strap; 8. Glasses frame; 9. Glasses fixing bar; 10. Infrared thermal imaging device; 15. Glasses legs; 16. Stabilizing frame; 17. Sliding block; 18. Limiting plate; 19. First threaded rod; 21. groove; 22. positioning column; 23. limiting support foot; 231. rotating shaft; 232. gear; 24. oblique push block; 241. rack; 242. guide column; 25. push rod; 26. return spring; 27. elastic sheet; 28. guide groove; 200, protective film; 201, non-adhesive area; 202, adhesive area; 203, first film portion; 2031, card slot; 204, second film portion; 2041, inserting portion. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Example: A high-precision infrared thermal imaging monocle device, such as Figure 1-9 As shown: It comprises a glasses frame 8, an infrared thermal imaging monocle glasses body 2 and a control box 5. The infrared thermal imaging monocle glasses body 2 has two pieces, which are respectively arranged at the left and right parts of the glasses frame 8. The rear end of the glasses frame 8 is provided with glasses fixing bars 9 near the left and right sides. The rear ends of the two glasses fixing bars 9 are internally threadedly connected with first threaded rods 19. The rear ends of the two first threaded rods 19 are fixedly installed with glasses legs 15. The outer surfaces of the two first threaded rods 19 are threadedly connected with stabilizing frames 16. The tops and bottoms of the two stabilizing frames 16 are fixedly installed with sliders 17. The rear ends of the two glasses fixing bars 9 are fixedly installed with first slide bars 6 near the tops and bottoms. The rear ends of the first slide bars 6 are fixedly installed with limiting plates 18. The first slide bars 6 are linearly slidably matched with the sliders 17 corresponding to each other along the axis direction of the first threaded rods 19. A control panel 4 is arranged on the front of the control box 5 , arm straps 7 are fixedly installed at the rear end of the control box 5 near the top and the bottom, and a connecting line 3 is arranged on the top of the control box 5 .

[0022] An infrared thermography device 10 is disposed on one side of the glasses frame 8. The infrared thermography device 10 includes an infrared thermal imaging probe and a visible light probe.

[0023] The infrared thermal imaging probe 1001 is used to capture and convert the thermal radiation of the object surface into an electrical signal. The visible light probe 1002 provides an ambient visible light image to enhance situational awareness. The infrared thermal imaging monocle body 2 is a display unit, and the infrared thermal imaging monocle body 2 serves as a visual output interface.

[0024] There are multiple connecting wires 3, and the control box 5 is electrically connected to the infrared thermal imaging monocle body 2 and the infrared thermal imaging device 10 through the corresponding connecting wires 3; a battery is provided in the control box 5, which is responsible for signal transmission and power supply between the control box 5 and the components inside the infrared thermal imaging device 10. The control panel 4 provides a user interaction interface, and the control box 5 integrates and protects the internal electronic components.

[0025] The connection between the first threaded rod 19 and the stabilizing frame 16 is connected by a ball bearing. When in use, the temple 15 is rotated to drive the first threaded rod 19 to rotate until the front of the temple 15 contacts the rear end of the stabilizing frame 16. The movement of the stabilizing frame 16 drives the slider 17 to move along the first slider 6, thereby increasing the stability of the first threaded rod 19 and the temple 15 when moving. Through the movement of the first threaded rod 19 and the temple 15, the distance between the temple 15 and the glasses fixing bar can be quickly adjusted according to the user's own needs, which is convenient for subsequent wearing.

[0026] Specifically, one end of each of the second slide bars 13 away from the clamping plate 14 respectively penetrates the inner left side wall of the placement rack 1 and extends out of the left side of the placement rack 1 , and the connection between the second slide bars 13 and the placement rack 1 is a movable sleeve connection.

[0027] The infrared thermography device 10 integrates the core temperature measurement function. Among them, the infrared thermal imaging probe and the visible light probe are used as thermal imaging sensors. High-precision infrared sensors can be selected, which can not only capture the subtle temperature differences of the detected object, but also have visible light imaging capabilities to meet diverse monitoring needs; By setting the arm strap 7, the control box 5 can be firmly fixed on the user's arm, effectively preventing the control box 5 from shaking or slipping during use; through the fixation of the arm strap 7, the user can more easily carry and move the control box 5, the infrared thermal imaging monocle body 2 and the glasses frame 8; this not only improves the portability of the equipment, but also makes the user more flexible when monitoring outdoors or in complex environments; the setting of the arm strap 7 allows the user to free his hands without holding the control box 5, the infrared thermal imaging monocle body 2 and the glasses frame 8, thereby improving work efficiency; at the same time, this fixing method also reduces the interference of the control box 5 on the user's activities.

[0028] A groove 21 is provided on the front side wall of the glasses frame 8, and a multi-layer protective film 200 is adhered to the front side wall of the infrared thermal imaging monocle main body 2, and the protective film 200 is divided into a non-adhesive area 201 and an adhesive area 202; the adhesive area 202 corresponds to the position of the infrared thermal imaging monocle main body 2, and the adjacent protective films 200 in this area are adhered together; the non-adhesive area 201 corresponds to the position of the groove 21, and the shape of the non-adhesive area 201 is adapted to the contour of the groove 21, and the adjacent protective films 200 in this area are separated from each other and stacked together.

[0029] The local protective film 200 of the non-adhesive area 201 is provided with a positioning hole, and the local protective film 200 of the non-adhesive area 201 includes a first film portion 203 and a second film portion 204. The half holes between the first film portion 203 and the second film portion 204 form positioning holes. At least one card slot 2031 is provided on the first film portion 203, and at least one inserting portion 2041 extends outward from the edge of the second film portion 204. The inserting portion 2041 is arc-shaped or crescent-shaped. Under normal conditions, as shown in the figure Figure 5 As shown, the half holes of the first membrane portion 203 and the second membrane portion 204 are spliced ​​to form a completed positioning hole, and the inserting portion 2041 is inserted into the corresponding card slot 2031 .

[0030] When the multi-layer protective film 200 is pasted on the front side wall of the infrared thermal imaging monocle body 2, the positioning accuracy is improved by the cooperation between the positioning holes and the positioning posts 22.

[0031] A positioning column 22 is vertically fixed on the inner bottom wall of the groove 21. The outer diameter of the positioning column 22 is the same as the inner diameter of the positioning hole and the clearance is matched. An inclined push block 24 is linearly slidably connected in the groove 21. The inclined push block 24 linearly approaches or moves away from the positioning column 22. The side of the inclined push block 24 close to the positioning column 22 is inclined at 45°. The inclined surface of the inclined push block 24 is provided with an avoidance groove. The avoidance groove provides space for the insertion of external components to facilitate the clamping of the first membrane part 203 and the second membrane part 204. The inner bottom wall of the groove 21 is provided with an elastic sheet 27 between the inclined push block 24 and the positioning column 22. The upper and lower sides of the inner bottom wall of the groove 21 are respectively rotatably connected with a rotating shaft 231. The outer side wall of the rotating shaft 231 is coaxially fixed with a corresponding gear 232. The upper end of the rotating shaft 231 is fixedly provided with a limited support foot 23, and the limited support foot 23 is designed to be inclined away from the side of the groove 21. Two racks 241 are fixedly provided on the inclined push block 24, and a push rod 25 is connected to one side of the inclined push block 24 in an axial sliding manner along the positioning column 22 (or the rotating shaft 231). The free end of the push rod 25 extends to the outside of the eyeglass frame 8 for easy manual operation. A return spring 26 is connected between the push rod 25 and the inner wall of the groove 21. The rack 241 is meshed with the corresponding gears 232. The rack 241 and the gear 232 adopt a spur gear structure. A cylindrical guide column 242 is fixed to one side of the rack 241, and a guide groove 28 is provided on the inner wall of the groove 21. The guide column 242 slides relatively in the corresponding guide groove 28 along the axial direction of the inclined rotating shaft 231.

[0032] The spacing between the two groups of limiting legs 23 is slightly smaller than the width of the non-adhesive area 202 of the protective film 200. When the non-adhesive area 202 of the protective film 200 is placed in the groove 21, since the protective film 200 itself has a certain flexibility and the inclined surface of the limiting legs 23 can pass downward over the two groups of limiting legs 23, the non-adhesive areas 202 of multiple groups of protective films 200 are pushed upward under the reverse thrust of the elastic sheet 27 below. At this time, the two groups of limiting legs 23 are used to limit the non-adhesive area 202 of the protective film 200, and the edge position of the non-adhesive area 202 of the uppermost protective film 200 is attached to the bottom surface of the limiting legs 23.

[0033] Before the non-adhesive area 202 of the protective film 200 is placed in the groove 21, the push rod 25 is manually pushed to move so that the oblique push block 24 is away from the positioning column 22 to provide a clearance space for the non-adhesive area 202 of the protective film 200. After the non-adhesive area 202 of the protective film 200 is placed in the groove 21, the push rod 25 is released, and under the elastic force of the return spring 26, the oblique push block 24 is partially moved to the top of the non-adhesive area 202 of the protective film 200.

[0034] After the outermost protective film 200 is affected by the external environment and becomes dirty, the push rod 25 is manually pushed away from the positioning column 22. During this process, the return spring 26 is compressed to generate a reverse elastic force, and the oblique push block 24 follows and moves away from the positioning column 22. At the same time, under the action of the guide column 242 and the guide groove 28, the oblique push block 24 is tilted away from the non-adhesive area 201 of the protective film 200, wherein the oblique push block 24 is slightly away from the top protective film 200 along the axial direction of the rotating shaft 231, and away from the top of the protective film 200 along the moving direction of the push rod 25; during this process, the component force of the tilted movement of the rack 241 on the movement of the push rod 25 drives the meshing gear 232 to rotate, and the rotation of the gear 232 drives the limiting leg 23 to rotate through the rotating shaft 231, and the rotation of the limiting leg 23 drives the non-adhesive area 201 of the top protective film 200 to move toward the positioning column 22 through the friction force; Afterwards, the push rod 25 is reset under the elastic force of the reset spring 26, and the oblique push block 24 is tilted downward and close to the non-adhesive area 201 of the protective film 200 under the action of the guide column 242 and the guide groove 28. During this process, the oblique push block 24 is pressed on the upper surface of the non-adhesive area 201 of the second group of protective films 200, and the non-adhesive area 201 of the topmost protective film 200 is guided to the inclined upper surface of the oblique push block 24, and the non-adhesive area 201 of the topmost protective film 200 is pushed outward by the inclined upper surface of the oblique push block 24, so that it is convenient for the user to manually pull it up to achieve tearing.

[0035] Furthermore, there are two groups of limiting legs 23 arranged on opposite sides of the groove 21 (non-adhesive area 201 of the protective film 200), and the transmission ratios of the gears 232 and the racks 241 corresponding to the two groups of limiting legs 23 are different, so that the two groups of limiting legs 23 rotate at different angles, so that the second membrane portion 204 moves a greater distance than the first membrane portion 203, thereby achieving the separation of the inserting portion 2041 of the second membrane portion 204 from the slot 2031 of the first membrane portion 203, and the arc-shaped inserting portion 2041 is easier to separate, thereby achieving the separation of the first membrane portion 203 and the second membrane portion 204, and the first membrane portion 203 and the second membrane portion 204 in the separated state can easily pass over the positioning column 22 and the limiting legs 23, making it more convenient to tear off the top layer of the protective film 200.

[0036] Furthermore, the inclined upper surface of the oblique push block 24 may be a structure with a high middle portion and low sides, so as to prevent the inserting portion 2041 of the second membrane portion 204 from being inserted into the slot 2031 of the first membrane portion 203 again.

[0037] Furthermore, the non-adhesive area 201 of the protective film 200 is provided with an isolation coating (such as a low-friction coating) to reduce the risk of adhesion, thereby facilitating the separation of the protective film 200 in the non-adhesive area 201 .

[0038] Furthermore, a composite coating is provided on the side wall of the adhesive area 202 of the protective film 200, and the composite coating is composed of an infrared enhancement layer, an anti-reflection layer, a hydrophobic and oleophobic layer, and a wear-resistant layer from the inside to the outside. The infrared enhancement layer enhances the transmittance of infrared signals without affecting the use of visible light; the anti-reflection layer reduces the reflection of light, prevents glare and reflected light from interfering with the device screen, and improves the visibility of the screen, especially in strong light environments, so that users can see the screen content more clearly; the hydrophobic and oleophobic layer prevents water droplets, oil stains and other liquids from adhering to the surface of the protective film, making the liquid easier to slide off, keeping the screen clean, reducing fingerprints and stains, and extending the service life of the protective film; the wear-resistant layer enhances the scratch resistance of the protective film to prevent scratches and damage caused by friction during daily use.

[0039] The above-mentioned embodiments only express the specific implementation of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A high-precision infrared thermal imaging monocle device, comprising an infrared thermal imaging monocle body (2) and an infrared thermal imaging device (10) arranged on a glasses frame (8), characterized in that: A multi-layer protective film (200) is provided on one side of the infrared thermal imaging monocle body (2), and a film tearing structure is provided on the glasses frame (8); The film tearing structure comprises a groove (21) provided on the eyeglass frame (8), wherein the groove (21) is used to accommodate the non-adhesive area (201) of the multiple layers of the protective film (200), the bottom wall of the groove (21) is provided with a positioning column (22) adapted to the positioning hole of the non-adhesive area (201), and the edge of the groove (21) is provided with a limiting support foot (23), and the limiting support foot (23) is used to limit the edge area of ​​the multiple layers of the non-adhesive area (201).

2. A high-precision infrared thermal imaging monocle device according to claim 1, characterized in that: An oblique push block (24) is slidably connected in the groove (21), and a push rod (25) is provided on the oblique push block (24) and extends to the outside of the groove (21). The oblique push block (24) is driven to reset by a reset spring (26). An elastic sheet (27) is provided on the bottom wall of the groove (21), and the elastic force of the elastic sheet (27) pushes the multi-layer non-adhesive area (201) toward the limit support foot (23).

3. A high-precision infrared thermal imaging monocle device according to claim 2, characterized in that: A rotating shaft (231) is rotatably connected in the groove (21), the limiting support foot (23) is arranged on the rotating shaft (231), a gear (232) is coaxially connected to the rotating shaft (231), a rack (241) is arranged on the inclined push block (24), the rack (241) is meshed with the gear (232), and the push rod (25) and the inclined push block (24) are slidably matched along the axial direction of the rotating shaft (231).

4. The high-precision infrared thermal imaging monocle device according to claim 3, characterized in that: The inner wall of the groove (21) is provided with a guide groove (28) which is inclined in the moving direction of the push block (24), and the rack (241) is provided with a guide column (242) which moves in the guide groove (28).

5. The high-precision infrared thermal imaging monocle device according to claim 4, characterized in that: The inclined surface of the oblique push block (24) close to the multi-layer non-adhesive area (201) is provided with an avoidance groove.

6. The high-precision infrared thermal imaging monocle device according to claim 4, characterized in that: A friction layer is provided on the side of the limiting support leg (23) that contacts the non-adhesive area (201).

7. The high-precision infrared thermal imaging monocle device according to claim 4, characterized in that: Limiting feet (23) are arranged on opposite sides of the non-adhesive area (201), and the movement of the oblique push block (24) drives the limiting feet (23) on the opposite sides to rotate at different angles.

8. The high-precision infrared thermal imaging monocle device according to claim 7, characterized in that: The non-adhesive area (201) of the protective film (200) comprises a first film portion (203) and a second film portion (204); a card slot (2031) is provided on the first film portion (203); and an inserting portion (2041) that is inserted and matched with the card slot (2031) is provided on the second film portion (204); the inserting portion (2041) is an arc-shaped structure.

9. The high-precision infrared thermal imaging monocle device according to claim 1, characterized in that: The device also comprises a control box (5), wherein the control box (5) is connected to the infrared thermal imaging monocle main body (2) and the infrared thermal imaging device (10) via a connecting line (3), a control panel (4) is arranged on the front of the control box (5), and an arm strap (7) is installed on the back of the control box (5).

10. The high-precision infrared thermal imaging monocle device according to claim 1, characterized in that: Both sides of the eyeglass frame (8) are provided with eyeglass fixing bars (9), the rear end of the eyeglass fixing bar (9) is internally threadedly connected to a first threaded rod (19), the rear end of the first threaded rod (19) is fixedly mounted with an eyeglass leg (15), the outer surface of the first threaded rod (19) is threadedly connected to a stabilizing frame (16), a slider (17) is fixedly mounted on the stabilizing frame (16), the rear end of the eyeglass fixing bar (9) is fixedly mounted with a first slide bar (6), the first slide bar (6) and a straight line pass through the slider (17), and the free end of the first slide bar (6) is fixedly mounted with a limiting plate (18).

Images