Adjustable magnifier

Abstract

The invention relates to the technical field of magnifying glass adjustment, and discloses an adjustable magnifying glass which comprises a magnifying glass handle, a lower end magnifying assembly, an upper end magnifying assembly, an adjusting assembly, a movable toothed belt, a flip cover positioning plate, a mounting connecting column, a limiting sleeve and a limiting adjusting rod. According to the device, through cooperative transmission of the movable toothed belt and the adjusting assembly, synchronous reverse adjustment of the two magnifying lenses is achieved, parallel alignment is always kept in the distance changing process, optical center deviation is avoided, the problems of ghosting and blurring of imaging are completely eradicated, and the magnifying lens is convenient to use and high in practicability. According to the device, the adjusting process is stable and smooth, the magnification times are linearly changed, the detail requirements of different observation objects can be accurately matched, and the device is suitable for various scenes such as daily reading and fine operation.

Description

Technical Field

[0001] This invention relates to the field of magnifying glass adjustment technology, and more specifically to an adjustable magnifying glass. Background Technology

[0002] A magnifying glass is a common optical tool that uses the optical principle of a convex lens to magnify the image of an object by converging light. Its core component is a convex lens with positive refractive power. Magnifying glasses are widely used in fine work, such as reading tiny printed text, soldering and repairing electronic components, identifying and processing jewelry, repairing watches, observing biological specimens, restoring art, and making models. In these scenarios, users often need to flexibly adjust the magnification to obtain the best observation effect according to the size of the details of the observed object, the required clarity, or individual differences in vision. Traditional single-lens magnifying glasses have a simple structure and low cost, but their magnification is solely determined by the fixed focal length of the lens, which cannot meet the above-mentioned need for flexible adjustment.

[0003] In existing magnifying glasses, the lens groups are fixed on brackets that can move along slide rails or guide rods. Users can change the spacing by directly pushing or pulling one or two brackets to make them slide on the slide rail. Some designs may be equipped with simple clips or friction pads for temporary fixation.

[0004] However, it is difficult to ensure that the lenses are parallel and aligned during the adjustment process. When adjusting the lens spacing, it is often difficult to ensure that the upper and lower lens groups move completely synchronously and symmetrically towards or away from each other. This will cause the optical center of the lens to shift during the adjustment process, which will also damage the image quality and make the magnification change nonlinear or inaccurate. The present invention aims to solve the problem that existing adjustable magnifying glasses cannot ensure that the lenses are parallel and aligned and that the optical center shift leads to a decrease in image quality when adjusting the lens spacing. Summary of the Invention

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides an adjustable magnifying glass, which can effectively solve the problems in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: This invention provides an adjustable magnifying glass, comprising a magnifying glass handle, a lower magnifying component, an upper magnifying component, an adjusting component, a movable toothed belt, a flip-top positioning plate, a mounting connecting post, a limiting sleeve, and a limiting adjusting rod; wherein, The magnifying glass handle provides a basic mounting platform for the entire device; The mounting connecting post is fixedly installed on the magnifying glass handle and has a horizontal axis; The lower and upper magnifying components are mounted on the inside of the magnifying glass handle by being movably sleeved on the mounting connecting post. The lower and upper magnifying components are coaxially arranged and can rotate along the mounting connecting post. The adjustment component is movably installed between the lower amplification component and the upper amplification component, and can make the upper amplification component rotate synchronously in the opposite direction when the lower amplification component rotates. The movable toothed belt is movably sleeved inside the magnifying glass handle, and the outer wall of the movable toothed belt meshes with the lower magnifying component. The rotation of the lower magnifying component can be controlled by the movable toothed belt. The flip-top positioning plate can constrain or release the movable toothed belt by flipping the cover; The limiting sleeve and the limiting adjustment rod connect the lower amplification component and the upper amplification component, and are used to keep the lower amplification component and the upper amplification component parallel and aligned during rotation.

[0007] It also includes a magnifying glass handle comprising a hand-held connecting rod, an extension limiting plate, and constraint fixing posts. Two constraint fixing posts and a mounting connecting post are fixedly installed on the inner side of the hand-held connecting rod from the center to one end. An extension limiting plate is fixedly provided at the end of the hand-held connecting rod near the mounting connecting post. The movable toothed belt is movably sleeved on the two constraint fixing posts.

[0008] It also includes a lower magnifying assembly comprising a lower magnifying lens, a first rotating connecting block, a first connecting arm, a first mounting ring, a first positioning adjustment block, and a first tilting groove. The first rotating connecting block and the first positioning adjustment block are respectively fixedly installed on opposite sides of the lower magnifying lens. The first connecting arm is movably connected to the first rotating connecting block. The first mounting ring is fixedly installed on the first connecting arm at the end away from the first rotating connecting block. A first tilting groove is formed on the inner wall of the first connecting arm.

[0009] It also includes an upper magnifying assembly comprising an upper magnifying lens, a second rotating connecting block, a second connecting arm, a second mounting ring, a second positioning adjustment block, and a second tilting groove. The second rotating connecting block and the second positioning adjustment block are respectively fixedly installed on opposite sides of the upper magnifying lens. The second connecting arm is movably connected to the second rotating connecting block. The second mounting ring is fixedly installed at the end away from the second rotating connecting block. The second tilting groove is formed on the inner wall of the second connecting arm.

[0010] It also includes that the lower amplification component and the upper amplification component are movably connected to the mounting connection column through a first mounting ring and a second mounting ring, and a curved toothed plate is fixed on the side of the first mounting ring facing the constraint fixing column. The movable toothed belt meshes with the curved toothed plate on the side of the constraint fixing column. When the movable toothed belt rotates on the constraint fixing column, it can drive the first mounting ring to rotate together.

[0011] It also includes an adjustment assembly comprising a movable adjustment plate, a second adjustment column, a first adjustment column, a guide constraint rod, and a hollow support frame. The second and first adjustment columns are movably installed on the second and first inclined slots, respectively. The two ends of the hollow support frame are fixedly connected to two extended limiting plates. The guide constraint rod is movably installed inside the hollow support frame, and one end of the guide constraint rod is fixedly connected to the movable adjustment plate. The movable adjustment plate is kept vertical by the constraint of the guide constraint rod and the hollow support frame, ensuring that the first adjustment column is always directly below the second adjustment column.

[0012] It also includes a magnetic fixing block fixed on the upper surface of the handheld connecting rod, two rotating positioning blocks fixed on the handheld connecting rod, the two rotating positioning blocks being arranged opposite each other on the handheld connecting rod, one end of the rotating positioning block being movably installed inside the flip cover positioning plate, so that the flip cover positioning plate can be flipped around the rotating positioning block as the axis, and a magnetic connecting piece fixed on the side of the flip cover positioning plate near the handheld connecting rod, when the flip cover positioning plate is attached to the top of the movable toothed belt and constrained thereon, the magnetic connecting piece and the magnetic fixing block are attached to each other and attracted.

[0013] It also includes that the limiting sleeve and the limiting adjustment rod are respectively fixedly installed on the second positioning adjustment block and the first positioning adjustment block, the movable end of the limiting sleeve is sleeved on the limiting adjustment rod, the lower magnifying lens is directly above the upper magnifying lens, and the lower magnifying lens and the upper magnifying lens are arranged relatively parallel.

[0014] The technical solution provided by this invention has the following advantages compared with the prior art: This device achieves synchronous and reverse adjustment of two magnifying lenses through the coordinated transmission of the movable toothed belt and the adjustment component. The lenses remain parallel and aligned throughout the spacing change process, avoiding optical center shift and eliminating imaging ghosting and blurring problems. This significantly improves the clarity and accuracy of observation. The adjustment process is smooth and stable, and the magnification changes linearly. It can accurately match the detail requirements of different observation objects and is suitable for various scenarios such as daily reading and fine work. Attached Figure Description

[0015] 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.

[0016] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2This is a partial structural schematic diagram of an embodiment of the present invention; Figure 3 This is a schematic diagram of the lower amplification component structure in an embodiment of the present invention; Figure 4 This is a schematic diagram of the upper amplification component structure in an embodiment of the present invention; Figure 5 This is a schematic diagram of the magnifying glass handle structure in an embodiment of the present invention; Figure 6 This is a schematic diagram of the adjustment component structure in an embodiment of the present invention.

[0017] The labels in the diagram represent: 1. Magnifying glass handle; 11. Handheld connecting rod; 12. Extension limiting plate; 13. Constraint fixing post; 2. Lower magnifying assembly; 21. Lower magnifying glass lens; 22. Rotating connecting block No. 1; 23. Connecting arm No. 1; 24. Mounting ring No. 1; 25. Positioning adjustment block No. 1; 26. Tilting groove No. 1; 3. Upper magnifying assembly; 31. Upper magnifying glass lens; 32. Rotating connecting block No. 2; 33. Connecting arm No. 2 34. Mounting arm; 35. Positioning adjustment block; 36. Inclined groove; 4. Adjustment assembly; 41. Movable adjustment plate; 42. Adjustment column; 43. Adjustment column; 44. Guide constraint rod; 45. Hollow support frame; 5. Movable toothed belt; 6. Rotating positioning block; 7. Magnetic fixing block; 8. Flip-top positioning plate; 9. Magnetic connecting piece; 10. Mounting connecting column; 101. Limiting sleeve; 102. Limiting adjustment rod. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0019] The present invention will be further described below with reference to embodiments.

[0020] Example: Please see Figures 1-6 The present invention provides a technical solution: an adjustable magnifying glass, including a magnifying glass handle 1, a lower magnifying component 2, an upper magnifying component 3, an adjusting component 4, a movable toothed belt 5, a flip-top positioning plate 8, a mounting connecting post 10, a limiting sleeve 101, and a limiting adjusting rod 102. The magnifying glass handle 1 provides a basic mounting platform for the entire device, and the mounting connecting post 10 is fixedly mounted on the magnifying glass handle 1 and has a horizontal axis. The lower magnifying component 2 and the upper magnifying component 3 are movably sleeved on the mounting connecting post 10 and installed inside the magnifying glass handle 1 through the mounting connecting post 10. The lower magnifying component 2 and the upper magnifying component 3 are coaxially arranged and can rotate along the mounting connecting post 10. The adjusting component 4 is movably installed between the lower magnifying component 2 and the upper magnifying component 3. When the lower magnifying component 2 rotates, the upper magnifying component 3 can rotate synchronously in the opposite direction. The movable toothed belt 5 is movably sleeved inside the magnifying glass handle 1, and the outer wall of the movable toothed belt 5 meshes with the lower magnifying component 2. The rotation of the lower magnifying component 2 can be controlled through the movable toothed belt 5. The flip-top positioning plate 8 can constrain or release the movable toothed belt 5 by flipping the cover. The limiting sleeve 101 and the limiting adjustment rod 102 connect the lower amplification component 2 and the upper amplification component 3 to keep the lower amplification component 2 and the upper amplification component 3 parallel and aligned when rotating. The magnifying glass handle 1 includes a handheld connecting rod 11, an extension limiting plate 12, and a constraint fixing post 13. Two constraint fixing posts 13 and a mounting connecting post 10 are fixedly installed on the inner side of the handheld connecting rod 11 from the center to one end. An extension limiting plate 12 is fixedly provided at the end of the handheld connecting rod 11 near the mounting connecting post 10. The movable toothed belt 5 is movably sleeved on the two constraint fixing posts 13. The lower magnifying component 2 includes a lower magnifying glass lens 21, a first rotating connecting block 22, a first connecting arm 23, a first mounting ring 24, a first positioning adjustment block 25, and a first tilting groove 26. The first rotating connecting block 22 and the first positioning adjustment block 25 are respectively fixedly installed on the opposite sides of the lower magnifying glass lens 21. The first connecting arm 23 is movably connected to the first rotating connecting block 22. The first mounting ring 24 is fixedly installed on the end of the first connecting arm 23 away from the first rotating connecting block 22. The first tilting groove 26 is opened on the inner wall of the first connecting arm 23.

[0021] In specific implementation: the flip-top positioning plate 8 locks or unlocks the position by constraining or releasing the movable toothed belt 5 through the flip-top operation. The limiting sleeve 101 and the limiting adjustment rod 102 are respectively fixedly installed on the second positioning adjustment block 35 and the first positioning adjustment block 25. The limiting sleeve 101 is movably sleeved on the limiting adjustment rod 102 to form a sliding pair, which is used to force the lower amplification component 2 and the upper amplification component 3 to remain parallel and their optical centers aligned when rotating. In the initial state, the flip-top positioning plate 8 closes and constrains the movable toothed belt 5. When the user flips the flip-top positioning plate 8 to release the movable toothed belt 5, the thumb pushes the movable toothed belt 5 to rotate along the constraint fixing post 13. Through meshing, it drives the first mounting ring 24 to rotate, driving the first connecting arm 23 to change the opening and closing angle around the mounting connecting post 10. At the same time, the first adjusting post 43 in the first tilting groove 26 moves and pushes the adjusting component 4. The adjusting component 4 drives the upper amplifying component 3 to rotate in the opposite direction through force transmission. The limiting sleeve 101 and the limiting adjustment rod 102 slide relative to each other to ensure that they remain parallel and aligned when the lens spacing changes, thereby changing the magnification. After the adjustment is completed, the flip cover positioning plate 8 closes again to lock the movable toothed belt 5 in a fixed position.

[0022] Please see Figures 3-4 The present invention provides a technical solution: the upper magnifying component 3 includes an upper magnifying lens 31, a second rotating connecting block 32, a second connecting arm 33, a second mounting ring 34, a second positioning adjustment block 35, and a second tilting groove 36. The second rotating connecting block 32 and the second positioning adjustment block 35 are respectively fixedly installed on opposite sides of the upper magnifying lens 31. The second connecting arm 33 is movably connected to the second rotating connecting block 32. The second mounting ring 34 is fixedly installed at the end away from the second rotating connecting block 32. The second tilting groove 36 is formed on the inner wall of the second connecting arm 33. The lower amplification component 2 and the upper amplification component 3 are movably connected to the mounting connection post 10 through the first mounting ring 24 and the second mounting ring 34. The first mounting ring 24 is fixedly provided with a curved toothed plate on the side facing the constraint fixing post 13. The movable toothed belt 5 meshes with the curved toothed plate on the side of the constraint fixing post 13. When the movable toothed belt 5 rotates on the constraint fixing post 13, it can drive the first mounting ring 24 to rotate together. The adjustment assembly 4 includes a movable adjustment plate 41, a second adjustment column 42, a first adjustment column 43, a guide constraint rod 44, and a hollow support frame 45. The second adjustment column 42 and the first adjustment column 43 are movably installed on the second inclined groove 36 and the first inclined groove 26, respectively. The two ends of the hollow support frame 45 are fixedly connected to the two extended limiting plates 12, respectively. The guide constraint rod 44 is movably installed inside the hollow support frame 45. One end of the guide constraint rod 44 is fixedly connected to the movable adjustment plate 41. The movable adjustment plate 41 is made vertical by the constraint of the guide constraint rod 44 and the hollow support frame 45, so that the first adjustment column 43 is always directly below the second adjustment column 42.

[0023] In specific implementation: when the movable toothed belt 5 rotates and drives the lower amplification component 2, the opening and closing of the first connecting arm 23 causes the position of the first adjusting column 43 in the first inclined groove 26 to move, pushing the movable adjusting plate 41. The movable adjusting plate 41 is kept vertical by the guiding effect of the guide constraint rod 44 and the hollow support frame 45, thereby driving the second adjusting column 42 to move synchronously in the second inclined groove 36. The inclined design of the first inclined groove 26 and the second inclined groove 36 efficiently converts rotational motion into linear displacement. The rigid connection of the movable adjustment plate 41 ensures the symmetry and accuracy of force transmission, driving the second connecting arm 33 to rotate in the opposite direction around the mounting connecting column 10 to change the opening and closing angle. At the same time, the relative sliding of the limiting sleeve 101 and the limiting adjustment rod 102 forces the lower magnifying component 2 and the upper magnifying component 3 to move symmetrically, keeping the lower magnifying lens 21 parallel to the upper magnifying lens 31 and the optical center aligned, so as to realize the continuous adjustment of the lens spacing and the change of magnification.

[0024] Please see Figures 5-6 The present invention provides a technical solution: a magnetic fixing block 7 is fixedly provided on the upper surface of the hand-held connecting rod 11, and two rotating positioning blocks 6 are fixedly provided on the hand-held connecting rod 11. The two rotating positioning blocks 6 are arranged opposite to each other on the hand-held connecting rod 11. One end of the rotating positioning block 6 is movably installed on the inner side of the flip-cover positioning plate 8, so that the flip-cover positioning plate 8 can be flipped around the rotating positioning block 6 as the axis. A magnetic connecting piece 9 is fixedly provided on the side of the flip-cover positioning plate 8 near the hand-held connecting rod 11. When the flip-cover positioning plate 8 is attached to the top of the movable toothed belt 5 and constrained, the magnetic connecting piece 9 and the magnetic fixing block 7 are attached to each other and attracted. The limiting sleeve 101 and the limiting adjustment rod 102 are respectively fixedly installed on the second positioning adjustment block 35 and the first positioning adjustment block 25. One movable end of the limiting sleeve 101 is sleeved on the limiting adjustment rod 102. The lower magnifying lens 21 is directly above the upper magnifying lens 31, and the lower magnifying lens 21 and the upper magnifying lens 31 are relatively parallel.

[0025] In the specific implementation: In the initial state, the flip-top positioning plate 8 is closed, the magnetic connecting piece 9 is attracted and fixed to the magnetic fixing block 7, the constrained movable toothed belt 5 cannot move, and the lower magnifying lens 21 and the upper magnifying lens 31 are at a fixed distance to provide the current magnification.

[0026] When the magnification needs to be adjusted, the user flips the flip cover positioning plate 8 to open it around the axis of the rotating positioning block 6. The magnetic connecting piece 9 disengages from the magnetic fixing block 7 to release the movable toothed belt 5. Then, the user moves the movable toothed belt 5 up and down against the thumb, causing it to rotate along the constraint fixing post 13 inside the hand-held connecting rod 11. The movable toothed belt 5 drives the first mounting ring 24 to rotate through engagement, driving the first connecting arm 23 to change the opening and closing angle around the mounting connecting post 10. The rotation of the movable toothed belt 5 is precisely engaged with the curved tooth plate of the first mounting ring 24 through its tooth structure, ensuring a smooth and slip-free rotation process.

[0027] The opening and closing of the first connecting arm 23 causes the position of the first adjusting column 43 in the first inclined groove 26 to move, pushing the movable adjusting plate 41. The movable adjusting plate 41 is kept vertical by the constraint of the guide constraint rod 44 and the hollow support frame 45, ensuring that the first adjusting column 43 is always directly below the second adjusting column 42, thereby driving the second adjusting column 42 to move synchronously in the second inclined groove 36. The inclined design of the first inclined groove 26 and the second inclined groove 36 converts the rotational motion of the first connecting arm 23 into the linear displacement of the first adjusting column 43 and the second adjusting column 42, and achieves the symmetry of force transmission through the rigid connection of the movable adjusting plate 41.

[0028] The second connecting arm 33 is driven to rotate in the opposite direction around the mounting connecting column 10 to change the opening and closing angle. At the same time, the limiting sleeve 101 and the limiting adjustment rod 102 slide relative to each other, forcing the lower magnifying component 2 and the upper magnifying component 3 to move symmetrically. This keeps the lower magnifying lens 21 and the upper magnifying lens 31 parallel and their optical centers aligned to change the lens spacing and magnification. The limiting sleeve 101 is sleeved on the limiting adjustment rod 102 to form a sliding pair, which restricts the relative displacement of the lower magnifying component 2 and the upper magnifying component 3 to only be axial, avoiding any lateral offset and ensuring that the optical centers of the lenses always coincide.

[0029] After adjusting to the desired position, the user closes the flip cover positioning plate 8, causing the magnetic connecting piece 9 to adhere to the magnetic fixing block 7, re-constraining the movable toothed belt 5, and locking the lens spacing to fix the magnification.

[0030] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. An adjustable magnifying glass, characterized in that, Includes a magnifying glass handle (1), a lower magnifying assembly (2), an upper magnifying assembly (3), an adjusting assembly (4), a movable toothed belt (5), a flip-top positioning plate (8), a mounting connecting post (10), a limiting sleeve (101), and a limiting adjusting rod (102): where, The magnifying glass handle (1) provides a basic mounting platform for the entire device; The mounting connecting post (10) is fixedly mounted on the magnifying glass handle (1) and has a horizontal axis; The lower magnifying component (2) and the upper magnifying component (3) are mounted on the inside of the magnifying glass handle (1) by being movably sleeved on the mounting connecting post (10). The lower magnifying component (2) and the upper magnifying component (3) are coaxially arranged and can rotate along the mounting connecting post (10). The adjustment component (4) is movably installed between the lower amplification component (2) and the upper amplification component (3), and can make the upper amplification component (3) rotate synchronously in the opposite direction when the lower amplification component (2) rotates; The movable toothed belt (5) is movably sleeved on the inside of the magnifying glass handle (1), and the outer wall of the movable toothed belt (5) meshes with the lower magnifying component (2). The rotation of the lower magnifying component (2) can be controlled by the movable toothed belt (5). The flip-top positioning plate (8) can constrain or release the movable toothed belt (5) by flipping the cover. The limiting sleeve (101) and the limiting adjustment rod (102) connect the lower amplification component (2) and the upper amplification component (3) to keep the lower amplification component (2) and the upper amplification component (3) parallel and aligned during rotation.

2. The adjustable magnifying glass according to claim 1, characterized in that: The magnifying glass handle (1) includes a hand-held connecting rod (11), an extension limiting plate (12), and a constraint fixing post (13). Two constraint fixing posts (13) and a mounting connecting post (10) are fixedly installed on the inner side of the hand-held connecting rod (11) from the center to one end. An extension limiting plate (12) is fixedly provided at one end of the hand-held connecting rod (11) near the mounting connecting post (10). The movable toothed belt (5) is movably sleeved on the two constraint fixing posts (13).

3. An adjustable magnifying glass according to claim 2, characterized in that: The lower magnifying assembly (2) includes a lower magnifying lens (21), a first rotating connecting block (22), a first connecting arm (23), a first mounting ring (24), a first positioning adjustment block (25), and a first tilting groove (26). The first rotating connecting block (22) and the first positioning adjustment block (25) are respectively fixedly installed on opposite sides of the lower magnifying lens (21). The first connecting arm (23) is movably connected to the first rotating connecting block (22). The first mounting ring (24) is fixedly installed on the first connecting arm (23) at the end away from the first rotating connecting block (22). The first tilting groove (26) is opened on the inner wall of the first connecting arm (23).

4. An adjustable magnifying glass according to claim 3, characterized in that: The upper magnifying component (3) includes an upper magnifying lens (31), a second rotating connecting block (32), a second connecting arm (33), a second mounting ring (34), a second positioning adjustment block (35), and a second tilting groove (36). The second rotating connecting block (32) and the second positioning adjustment block (35) are respectively fixedly installed on opposite sides of the upper magnifying lens (31). The second connecting arm (33) is movably connected to the second rotating connecting block (32). The second mounting ring (34) is fixedly installed at the end away from the second rotating connecting block (32). The second tilting groove (36) is opened on the inner wall of the second connecting arm (33).

5. An adjustable magnifying glass according to claim 4, characterized in that: The lower amplification component (2) and the upper amplification component (3) are movably connected to the mounting connecting post (10) through the first mounting ring (24) and the second mounting ring (34). The first mounting ring (24) is fixedly provided with a curved toothed plate on the side facing the constraint fixing post (13). The movable toothed belt (5) meshes with the curved toothed plate on the side of the constraint fixing post (13). When the movable toothed belt (5) rotates on the constraint fixing post (13), it can drive the first mounting ring (24) to rotate together.

6. An adjustable magnifying glass according to claim 5, characterized in that: The adjustment assembly (4) includes a movable adjustment plate (41), a second adjustment column (42), a first adjustment column (43), a guide constraint rod (44), and a hollow support frame (45). The second adjustment column (42) and the first adjustment column (43) are movably installed on the second inclined groove (36) and the first inclined groove (26), respectively. The two ends of the hollow support frame (45) are fixedly connected to two extended limiting plates (12), respectively. The guide constraint rod (44) is movably installed inside the hollow support frame (45). One end of the guide constraint rod (44) is fixedly connected to the movable adjustment plate (41). The movable adjustment plate (41) is vertically positioned by the constraint of the guide constraint rod (44) and the hollow support frame (45), so that the first adjustment column (43) is always directly below the second adjustment column (42).

7. An adjustable magnifying glass according to claim 6, characterized in that: A magnetic fixing block (7) is fixedly provided on the upper surface of the hand-held connecting rod (11). Two rotating positioning blocks (6) are fixedly provided on the hand-held connecting rod (11). The two rotating positioning blocks (6) are arranged opposite to each other on the hand-held connecting rod (11). One end of the rotating positioning block (6) is movably installed inside the flip-top positioning plate (8) so that the flip-top positioning plate (8) can be flipped around the rotating positioning block (6) as the axis. A magnetic connecting piece (9) is fixedly provided on the side of the flip-top positioning plate (8) close to the hand-held connecting rod (11). When the flip-top positioning plate (8) is attached to the top of the movable toothed belt (5) and constrained, the magnetic connecting piece (9) and the magnetic fixing block (7) are attached to each other and attracted.

8. An adjustable magnifying glass according to claim 7, characterized in that: The limiting sleeve (101) and the limiting adjustment rod (102) are respectively fixedly installed on the second positioning adjustment block (35) and the first positioning adjustment block (25). The movable end of the limiting sleeve (101) is sleeved on the limiting adjustment rod (102). The lower magnifying lens (21) is directly above the upper magnifying lens (31), and the lower magnifying lens (21) and the upper magnifying lens (31) are arranged relatively parallel.

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