Hinge capable of quickly calibrating and aligning axes of upper hinge and lower hinge

Abstract

The invention relates to the technical field of hinges, in particular to a hinge capable of quickly calibrating and aligning the axes of an upper hinge and a lower hinge, which comprises a fixed hinge plate, a movable hinge plate and a mandrel, a first rotating seat and a second rotating seat are integrally formed on one side of the fixed hinge plate, and a gap is formed between the first rotating seat and the second rotating seat; a through first mounting hole is formed in the first rotating seat, an inner cavity is formed in the second rotating seat, a rotating hole communicated with the inner cavity is formed in the top of the second rotating seat, a first shaft sleeve is inserted into the bottom of the first mounting hole, and a second shaft sleeve is inserted into the rotating hole; according to the invention, the ejection unit is integrated on the second rotating seat for fixing the fan blades, so that when the core shaft is disassembled, stable axial ejection force can be applied to the core shaft only by operating the ejection unit, alignment and knocking in a narrow space are not needed, the operation intensity is reduced, the risks of part damage and personnel scratch caused by tool slipping are avoided, and the working efficiency is improved. And the taking-out process of the mandrel is more labor-saving and safer.

Description

Technical Field

[0001] This invention relates to the field of hinge technology, specifically to a hinge that allows for rapid alignment of the upper and lower hinge axes. Background Technology

[0002] Screen doors are seasonal products used for ventilation and insect prevention in the home. They are typically installed and used during the peak insect season and need to be disassembled for cleaning, maintenance, or storage during winter and other off-seasons. Therefore, their hinges need to be compatible with frequent disassembly and assembly. Currently, the traditional hinges used in screen doors on the market mainly consist of two types of components: one is two leaf plates fixed to the door leaf (moving blades) and the door frame (fixed blades), respectively, with each leaf plate having a corresponding sleeve for inserting the pivot; the other is a solid... The mandrel, acting as a rotating connector, is a sleeve that passes through the two leaf plates, allowing the movable fan blades to rotate relative to each other. Its assembly and disassembly process is as follows: During installation, the mandrel needs to be manually aligned visually with the sleeve axis of the two leaf plates, and then inserted into the sleeve from top to bottom to form a rotating pair. During disassembly, external tools such as screwdrivers are needed to apply impact force to the end of the mandrel from the narrow operating space at the bottom of the hinge, which is obstructed by the door leaf and frame, causing the mandrel to come out axially upwards along the sleeve. However, the above-mentioned traditional hinge structure has the following drawbacks in actual use: Because the operating space between the mandrel and the sleeve is limited after the hinge is installed, when using a tool to push out the mandrel, it is not only necessary to accurately align the end of the mandrel, but also to apply a large impact force to overcome the fitting resistance between the mandrel and the sleeve. The operation is laborious and inefficient. At the same time, the tool is prone to slipping and deviating in the narrow space, which can easily cause deformation of the end of the mandrel and wear of the leaf plate sleeve, and may also cause safety risks such as scratches to the operator. Traditional hinges rely solely on manual visual alignment of the sleeves of the two leaf plates, lacking a dedicated axis alignment structure. After installation, it is very easy for the axis of the sleeves of the upper and lower leaf plates to be misaligned. This misalignment will cause uneven friction between the spindle and the sleeve, which will aggravate abnormal wear of the spindle and sleeve over long-term use, causing the hinge to jam, make abnormal noises when rotating, and in severe cases, it will lead to spindle deformation and loosening of the leaf plates, significantly shortening the service life of the hinge. Therefore, a hinge that allows for quick alignment of the upper and lower hinge axes is needed to improve the above-mentioned problems. Summary of the Invention

[0003] To address the problem that the limited operating space between the mandrel and sleeve after hinge installation necessitates precise alignment of the mandrel end and the application of significant impact force to overcome the resistance between the mandrel and sleeve when using tools to eject the mandrel, resulting in a laborious and inefficient operation, this invention provides a hinge that allows for rapid alignment of the upper and lower hinge shafts, thus solving the aforementioned problems.

[0004] To achieve the above objectives, the present invention provides the following technical solution: A hinge that enables quick alignment of the upper and lower hinge axes includes a fixed hinge plate, a movable hinge plate, and a spindle. A first rotating seat and a second rotating seat are integrally formed on one side of the fixed hinge plate, with a gap between them. The first rotating seat has a through-hole. The second rotating seat has an internal cavity and a rotating hole at its top communicating with the cavity. A first bushing is inserted into the bottom of the first mounting hole, and a second bushing is inserted into the rotating hole. Movable grooves are formed at both ends of the top of the second bushing.

[0005] One side of the movable plate is integrally formed with a third rotating seat. The third rotating seat has a through second mounting hole. A fourth bushing and a fifth bushing are respectively inserted into the top and bottom of the second mounting hole. The bottom of the fifth bushing has a moving groove and a limiting groove.

[0006] When the third rotating seat is engaged within the interval, the first bushing is in contact with the fourth bushing, and the second bushing is in contact with the fifth bushing. The movable groove, the moving groove, and the limiting groove are on the same central axis. A mandrel is inserted into the first mounting hole. The mandrel passes downward through the central holes of the first bushing, the fourth bushing, the fifth bushing, and the second bushing in sequence and then extends into the inner cavity.

[0007] The inner cavity is provided with an ejection unit that can lift the mandrel upwards, and the ejection unit is also provided with a calibration unit for calibrating the connection between the fixed page plate and the movable page plate.

[0008] As a preferred embodiment of the present invention, the first bushing, the fourth bushing, the fifth bushing, and the second bushing are all T-shaped, and each has a central hole through which the mandrel can pass.

[0009] As a preferred embodiment of the present invention, the bottom of the mandrel is integrally formed with a top rod, and after the mandrel is inserted into the first mounting hole, a third bushing is inserted into the top of the first mounting hole.

[0010] As a preferred embodiment of the present invention, a positioning block is integrally formed on one side of the back of both the fixed page plate and the movable page plate that are close to each other, and the positioning block has a rectangular structure.

[0011] As a preferred embodiment of the present invention, a rotating hole communicating with the inner cavity is provided on one side wall of the second rotating seat, one end of the ejector unit protrudes out of the rotating hole, a fixing plate is fixedly installed inside the inner cavity, a through hole for the ejector rod to pass through is provided at the top center of the fixing plate, and side grooves are provided at both ends of the top of the fixing plate, and through holes communicating with the rotating hole are provided at both ends of the top of the second rotating seat, and the through holes and side grooves are coaxial.

[0012] As a preferred embodiment of the present invention, the ejection unit includes fixed rods arranged in a rectangular array between the fixed plate and the bottom surface of the inner wall of the cavity. Each of the four fixed rods is fitted with a spring, and a lifting plate is slidably mounted on the four fixed rods. The two ends of the springs respectively abut against the fixed plate and the lifting plate. An arc-shaped block is fixedly mounted on the bottom of the lifting plate. A rotating rod is rotatably mounted on the rotating hole. One end of the rotating rod extends into the inner cavity and rotates on the inner wall of the inner cavity. An elliptical block is fixedly fitted onto the outer wall of the rotating rod, and the horizontal end of the elliptical block contacts the arc-shaped block.

[0013] As a preferred embodiment of the present invention, a knob is fixedly connected to one end of the rotating rod that protrudes from the rotating hole, and an anti-slip rubber pad is provided on the knob.

[0014] As a preferred embodiment of the present invention, the calibration unit includes calibration rods fixedly installed on both sides of the lifting plate, and the top of the calibration rods passes through the side groove and the through hole in sequence before extending into the movable groove.

[0015] As a preferred embodiment of the present invention, sliding holes are provided at the four corners of the top of the lifting plate, and the sliding holes are slidably engaged with the fixing rod.

[0016] As a preferred embodiment of the present invention, the top of the lifting plate is fixed with a mounting ring, and the top rod passes through the through hole and rotates to engage with the mounting ring.

[0017] Compared with the prior art, the present invention integrates an ejector unit on the second rotating seat that fixes the fan blade. When disassembling the mandrel, a stable axial ejector force can be applied to the mandrel simply by operating the ejector unit. There is no need to align or knock in a confined space, which not only reduces the intensity of operation, but also avoids the risk of damage to parts and personnel scratches caused by tool slippage, making the process of removing the mandrel easier and safer.

[0018] Compared with the prior art, the present invention, through the coordinated operation of the ejection unit and the calibration unit, enables the calibration unit to accurately position the sleeve axis of the two fan blades during the docking and installation of the fixed fan blades and the movable fan blades. This ensures that the axis of the upper and lower fan blades is on the same straight line after the mandrel is inserted, solving the defect of easy misalignment due to manual alignment of traditional hinges, avoiding off-center friction between the mandrel and the sleeve, effectively reducing abnormal wear and jamming of parts, and significantly improving the long-term reliability and service life of the hinge.

[0019] Compared with the prior art, the present invention provides positioning blocks on both the fixed and movable leaf plates, which can further ensure that the axes of the fixed and movable leaf plates are on the same axis after installation. This completely solves the defect that the axes of the fixed and movable leaf plates are not on the same axis after installation of traditional hinges, and improves the service life of the hinge. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the unfolded structure of the present invention; Figure 3 This is a schematic diagram of the fifth bushing structure of the present invention; Figure 4 This is a schematic diagram of the second bushing structure of the present invention; Figure 5 This is a schematic diagram of the second rotating seat structure of the present invention; Figure 6 This is a top view of the structure of the present invention; Figure 7 This is a schematic cross-sectional view of the second rotating seat of the present invention; Figure 8 This is a schematic diagram of the ejector unit structure of the present invention; Figure 9 This is a schematic diagram of the lifting plate structure of the present invention; Figure 10 This is a schematic diagram of the elliptical block structure of the present invention; Figure 11 This is a schematic diagram of the connection structure between the fixed page plate and the movable page plate of the present invention.

[0021] In the diagram: 1. Fixed leaf plate; 11. First rotating seat; 111. First mounting hole; 12. Second rotating seat; 121. Inner cavity; 122. Rotating hole; 123. Fixed plate; 1231. Through hole; 1232. Side groove; 124. Through hole; 13. First bushing; 14. Second bushing; 141. Movable groove; 15. Third bushing; 2. Movable leaf plate; 21. Third rotating seat; 211. Second mounting hole; 22. Fourth bushing; 23. Fifth bushing; 231. Moving groove; 232. Limiting groove; 3. Ejection unit; 31. Fixed rod; 32. Spring; 33. Lifting plate; 34. Mounting ring; 35. Arc block; 36. Rotating rod; 37. Elliptical block; 38. Calibration rod; 4. Mandrel; 41. Push rod; 5. Positioning block. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0023] Example: Please refer to Figure 1-11The hinge shown allows for quick alignment of the upper and lower hinge axes. It includes a fixed hinge plate 1, a movable hinge plate 2, and a spindle 4. A first rotating seat 11 and a second rotating seat 12 are integrally formed on one side of the fixed hinge plate 1. There is a gap between the first rotating seat 11 and the second rotating seat 12. A through first mounting hole 111 is provided on the first rotating seat 11. The second rotating seat 12 has an inner cavity 121 inside and a rotating hole 122 communicating with the inner cavity 121 is provided at the top. A first bushing 13 is inserted into the bottom of the first mounting hole 111 and a second bushing 14 is inserted into the rotating hole 122. Both ends of the top of the second bushing 14 are provided with movable grooves 141.

[0024] One side of the movable page plate 2 is integrally formed with a third rotating seat 21. A through second mounting hole 211 is provided on the third rotating seat 21. A fourth bushing 22 and a fifth bushing 23 are respectively inserted into the top and bottom of the second mounting hole 211. A moving groove 231 and a limiting groove 232 are respectively provided at the bottom of the fifth bushing 23.

[0025] Among them, the moving groove 231 and the limiting groove 232 at the bottom of the fifth bushing 23 are coaxial elongated grooves, which facilitates the quick insertion of the calibration rod 38 and achieves precise positioning. When the third rotating seat 21 is embedded in the interval, the bottom end face of the fourth bushing 22 is completely in contact with the top end face of the first bushing 13, and the top end face of the fifth bushing 23 is completely in contact with the bottom end face of the second bushing 14, ensuring that the coaxiality error of the center hole of the four bushings is ≤0.02mm.

[0026] When the third rotating seat 21 is engaged within the interval, the first bushing 13 is in contact with the fourth bushing 22, and the second bushing 14 is in contact with the fifth bushing 23. The movable groove 141, the moving groove 231, and the limiting groove 232 are on the same central axis. A mandrel 4 is inserted into the first mounting hole 111. The mandrel 4 passes downward through the central holes of the first bushing 13, the fourth bushing 22, the fifth bushing 23, and the second bushing 14 in sequence and then extends into the inner cavity 121.

[0027] The inner cavity 121 is provided with an ejection unit 3 that can lift the mandrel 4 upward. The ejection unit 3 is also provided with a calibration unit for calibrating the fixed page plate 1 and the movable page plate 2.

[0028] In this embodiment, specific references Figure 2 , Figure 3 and Figure 4 The first bushing 13, the fourth bushing 22, the fifth bushing 23 and the second bushing 14 are all T-shaped, and each has a central hole through which the mandrel 4 can pass.

[0029] In this embodiment, specific references Figure 2The bottom of the mandrel 4 is integrally formed with a push rod 41. After the mandrel 4 is inserted into the first mounting hole 111, the top of the first mounting hole 111 is inserted into the third bushing 15.

[0030] The mandrel 4 is made of stainless steel with a chrome-plated surface, which is both rust-proof and wear-resistant. The mandrel 4 is fitted with the center hole of each bushing with a clearance of 0.005 to 0.01 mm to ensure that the mandrel 4 rotates flexibly and without radial movement.

[0031] In this embodiment, specific references Figure 1 , Figure 2 , Figure 6 and Figure 11 Both the fixed hinge plate 1 and the movable hinge plate 2 have a positioning block 5 integrally formed on one side of their back surfaces that are close to each other. The positioning block 5 has a rectangular structure, which can ensure that the axes of the upper and lower hinges are on the same axis after installation. This solves the defect that the axes of the upper and lower hinges are not on the same axis after installation of traditional hinges and improves the service life of the hinges.

[0032] Specifically, after assembly, the movable leaf plate 2 is rotated counterclockwise to bring it closer to the fixed leaf plate 1. During this process, the positioning block 5 on the movable leaf plate 2 abuts against the fixed leaf plate 1 to form a specific angle. This process restricts the rotation of the movable leaf plate 2, thereby constraining it and ensuring that the first mounting hole 111, the rotating hole 122 and the second mounting hole 211 on the movable leaf plate 2 are coaxial.

[0033] The fixed plate 1 is made of high-strength aluminum alloy through die casting. The first rotating seat 11 and the second rotating seat 12 on one side are symmetrically distributed. The gap between them is matched with the third rotating seat 21, and the tolerance is controlled within 0.02 to 0.05 mm. This can prevent the third rotating seat 21 from wobbling left and right after it is inserted. The first mounting hole 111 on the first rotating seat 11 is a stepped hole structure. The countersunk hole section at the bottom is interference-fitted with the T-shaped bottom of the first bushing 13 to achieve the fixed positioning of the first bushing 13.

[0034] The movable page plate 2 is made of the same material as the fixed page plate 1. The third rotating seat 21 on one side is an integral protrusion structure. The second mounting hole 211 is a through stepped hole. The fourth bushing 22 and the fifth bushing 23 are also made of wear-resistant modified nylon material to reduce frictional loss when the spindle 4 rotates.

[0035] In this embodiment, specific references Figure 1 , Figure 2 , Figure 5 and Figure 7The second rotating seat 12 has a rotating hole 122 on one side wall that connects to the inner cavity 121. One end of the ejector unit 3 passes through the rotating hole 122. A fixing plate 123 is fixedly installed inside the inner cavity 121. A through hole 1231 is opened through the center of the top of the fixing plate 123 so that the ejector rod 41 can pass through. Side grooves 1232 are opened through both ends of the top of the fixing plate 123. Through holes 124 that connect to the rotating hole 122 are opened at both ends of the top of the second rotating seat 12. The through holes 124 and the side grooves 1232 are coaxial.

[0036] The fixing plate 123 is made of stainless steel and is welded to the inner wall of the inner cavity 121. Its through hole 1231 is clearance fit with the top rod 41, and the side groove 1232 is clearance fit with the calibration rod 38 to ensure smooth lifting of the top rod 41 and the calibration rod 38.

[0037] The inner cavity 121 of the second rotating seat 12 is a rectangular cavity, and the rotating hole 122 at its top is also a stepped hole, which is interference-fitted with the T-shaped bottom of the second bushing 14 to prevent the second bushing 14 from shifting when the spindle 4 rotates. Both the first bushing 13 and the second bushing 14 are made of wear-resistant modified nylon material. The end face of its T-shaped structure can fit with the stepped surface of the mounting hole to play an axial limiting role. The movable groove 141 at the top of the second bushing 14 is a long strip through groove. The groove width is clearance-fitted with the diameter of the calibration rod 38, with a tolerance of 0.01 to 0.03 mm. This ensures that the calibration rod 38 can pass through smoothly and avoids radial deviation during the calibration process.

[0038] In this embodiment, specific references Figure 2 , Figure 5 , Figure 8 , Figure 9 and Figure 10 The ejection unit 3 includes four fixed rods 31 arranged in a rectangular array and fixed between the fixed plate 123 and the bottom surface of the inner wall of the inner cavity 121. Each of the four fixed rods 31 is fitted with a spring 32. A lifting plate 33 is slidably mounted on the four fixed rods 31. The two ends of the springs 32 abut against the fixed plate 123 and the lifting plate 33 respectively. An arc-shaped block 35 is fixedly mounted on the bottom of the lifting plate 33. A rotating rod 36 is rotatably mounted on the rotating hole 122. One end of the rotating rod 36 extends into the inner cavity 121 and rotates on the inner wall of the inner cavity 121. An elliptical block 37 is fixedly fitted on the outer wall of the rotating rod 36. The horizontal end of the elliptical block 37 contacts the arc-shaped block 35.

[0039] The lifting plate 33 has sliding holes at the four corners of its top, which slide in conjunction with the fixing rod 31.

[0040] The fixing rods 31 of the ejection unit 3 are made of high-strength alloy steel and have been hardened to a hardness of HRC55~60. The four fixing rods 31 are arranged in a rectangular array to ensure that the lifting plate 33 rises and falls smoothly. The spring 32 is a cylindrical helical compression spring made of stainless steel. Its elastic coefficient has been precisely calculated to provide a stable ejection force. The lifting plate 33 is a thin stainless steel plate. The sliding holes at its four corners are clearance-fitted with the fixing rods 31. The arc-shaped block 35 at the bottom of the lifting plate 33 is made of wear-resistant polyurethane. Its arc surface fits tightly with the outer wall of the elliptical block 37 to reduce friction during rotation.

[0041] In this embodiment, specific references Figure 7 and Figure 8 A knob is fixedly connected to one end of the rotating rod 36 that passes through the rotating hole 122, and an anti-slip rubber pad is provided on the knob.

[0042] The rotating rod 36 is made of stainless steel and is fitted with a nylon bushing between it and the rotating hole 122 to ensure smooth rotation. The anti-slip rubber pad on the knob has a diamond-shaped anti-slip texture to increase the friction between the hand and the knob, making it easy to operate manually.

[0043] In this embodiment, specific references Figure 4 , Figure 7 and Figure 8 The calibration unit includes calibration rods 38 fixedly installed on both sides of the lifting plate 33. The top of the calibration rods 38 passes through the side groove 1232 and the through hole 124 in sequence and then extends into the movable groove 141.

[0044] The calibration rod 38 of the calibration unit is made of stainless steel and has a 15° chamfer at the top. The length and stroke of the calibration rod 38 are precisely designed so that when the lifting plate 33 rises to the highest point, the calibration rod 38 can pass through the three slots at the same time and protrude above the second bushing 14. When assembling the fixed fan blade 1 and the movable fan blade 2, the moving slot 231 on the fifth bushing 23 installed inside the third rotating seat 21 can be aligned with the protruding calibration rod 38, and then the movable fan blade 2 can be pushed in. While the movable fan blade 2 moves, the calibration rod 38 passes through the moving slot 231 and the center hole of the fifth bushing 23 and enters the limiting slot 232. When the calibration rod 38 is in contact with the inner wall of the limiting slot 232, the first rotating seat 11, the second rotating seat 12 and the third rotating seat 21 are coaxially positioned.

[0045] In this embodiment, specific references Figure 2 , Figure 7 and Figure 8 The top of the lifting plate 33 is fixed with an installation ring 34, and the top rod 41 passes through the through hole 1231 and rotates to fit on the installation ring 34.

[0046] Among them, the push rod 41 at the bottom of the mandrel 4 is an integrally formed structure with a diameter smaller than that of the mandrel 4. The mounting ring 34 has a circular groove. The push rod 41 and the circular groove at the top of the mounting ring 34 are rotatably engaged, which allows the mandrel 4 to rotate freely with the movable plate 2 and also enables the mandrel 4 to move up and down.

[0047] A hinge that allows for quick alignment of the upper and lower hinge axes during operation: When connecting the fixed blade 1 and the movable blade 2, manually rotate the outer knob of the second rotating seat 12 to drive the rotating rod 36 to rotate synchronously. The elliptical block 37 on the outer wall of the rotating rod 36 rotates accordingly. Since the horizontal end of the elliptical block 37 contacts the arc-shaped block 35 at the bottom of the lifting plate 33, as the elliptical block 37 rotates eccentrically, its long axis end gradually pushes the arc-shaped block 35 upward, thereby driving the lifting plate 33 to slide upward along the fixed rod 31. The spring 32 is compressed and stores force. During the upward movement of the lifting plate 33, the calibration rods 38 on both sides move upward synchronously, passing through the side groove 1232 of the fixed plate 123 and the through hole 124 of the second rotating seat 12 in sequence, and finally inserting into the movable groove 141 of the second bushing 14 and protruding above the second bushing 14. When assembling the fixed fan blade 1 and the movable fan blade 2, the fifth bushing 23 installed inside the third rotating seat 21 can be... The movable slot 231 is aligned with the protruding calibration rod 38, and then the movable fan blade 2 is pushed in. As the movable fan blade 2 moves, the calibration rod 38 passes through the center hole of the movable slot 231 and the fifth bushing 23 and enters the limiting slot 232. When the calibration rod 38 is in contact with the inner wall of the limiting slot 232, the first rotating seat 11, the second rotating seat 12 and the third rotating seat 21 are coaxially positioned. At this time, the mandrel 4 is inserted from the top of the first rotating seat 11, passes through the first bushing 13, the fourth bushing 22, the fifth bushing 23 and the second bushing 14 in sequence and extends into the mounting ring 34. This ensures that the axes of the upper and lower fan blades are on the same straight line after the mandrel is inserted. This solves the defect of easy misalignment when manually aligned by traditional hinges, avoids the off-center friction between the mandrel and the sleeve, effectively reduces abnormal wear and jamming of parts, and significantly improves the long-term reliability and service life of the hinge.

[0048] When the hinge needs to be disassembled, the above-mentioned synchronous operation is used. As the calibration rod 38 rises, the lifting plate 33 rises, causing the top rod 41 to rise. The rise of the top rod 41 causes the spindle 4 to rise, thereby allowing the spindle 4 to extend out of the first mounting hole 111. The user can then quickly remove the spindle 4, thereby separating the fixed page plate 1 from the movable page plate 2.

[0049] All standard parts used in this application can be purchased from the market. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art and are also general components, which are common knowledge in this field.

[0050] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A hinge that enables rapid alignment of the upper and lower hinge axes, comprising a fixed hinge plate (1), a movable hinge plate (2), and a spindle (4), characterized in that: The fixed plate (1) has a first rotating seat (11) and a second rotating seat (12) integrally formed on one side. There is a gap between the first rotating seat (11) and the second rotating seat (12). The first rotating seat (11) has a through first mounting hole (111). The second rotating seat (12) has an inner cavity (121) inside and a rotating hole (122) communicating with the inner cavity (121) is opened at the top. A first bushing (13) is inserted into the bottom of the first mounting hole (111). A second bushing (14) is inserted into the rotating hole (122). Both ends of the top of the second bushing (14) have through movable grooves (141). The movable plate (2) has a third rotating seat (21) integrally formed on one side. The third rotating seat (21) has a through second mounting hole (211). The top and bottom of the second mounting hole (211) are respectively inserted into a fourth bushing (22) and a fifth bushing (23). The bottom of the fifth bushing (23) has a moving groove (231) and a limiting groove (232). When the third rotating seat (21) is engaged within the interval, the first bushing (13) is in contact with the fourth bushing (22), and the second bushing (14) is in contact with the fifth bushing (23). The movable groove (141), the moving groove (231), and the limiting groove (232) are on the same central axis. A mandrel (4) is inserted into the first mounting hole (111). The mandrel (4) passes downward through the central holes of the first bushing (13), the fourth bushing (22), the fifth bushing (23), and the second bushing (14) in sequence and then extends into the inner cavity (121). The inner cavity (121) is provided with an ejection unit (3) that can lift the mandrel (4) upwards. The ejection unit (3) is also provided with a calibration unit for calibrating the fixed page plate (1) and the movable page plate (2).

2. A hinge according to claim 1 that enables rapid alignment of the upper and lower hinge axes, characterized in that: The first bushing (13), the fourth bushing (22), the fifth bushing (23), and the second bushing (14) are all T-shaped, and each has a central hole through which the spindle (4) can pass.

3. A hinge according to claim 2 that enables rapid alignment of the upper and lower hinge axes, characterized in that: The bottom of the mandrel (4) is integrally formed with a top rod (41). After the mandrel (4) is inserted into the first mounting hole (111), a third bushing (15) is inserted into the top of the first mounting hole (111).

4. A hinge according to claim 1 that enables rapid alignment of the upper and lower hinge axes, characterized in that: The fixed page plate (1) and the movable page plate (2) are both integrally formed with a positioning block (5) on one side of their back surfaces that are close to each other. The positioning block (5) has a rectangular structure.

5. A hinge according to claim 1 or 3 that enables rapid alignment of the upper and lower hinge axes, characterized in that: A rotating hole (122) communicating with the inner cavity (121) is provided on one side wall of the second rotating seat (12). One end of the ejector unit (3) passes through the rotating hole (122). A fixing plate (123) is fixedly installed inside the inner cavity (121). A through hole (1231) for the ejector rod (41) to pass through is provided at the top center of the fixing plate (123). Side grooves (1232) are provided at both ends of the top of the fixing plate (123). Through holes (124) communicating with the rotating hole (122) are provided at both ends of the top of the second rotating seat (12). The through holes (124) and the side grooves (1232) are coaxial.

6. A hinge according to claim 5 that enables rapid alignment of the upper and lower hinge axes, characterized in that: The ejection unit (3) includes fixed rods (31) arranged in a rectangular array between the fixed plate (123) and the bottom surface of the inner wall of the inner cavity (121). Each of the four fixed rods (31) is fitted with a spring (32). A lifting plate (33) is slidably installed on the four fixed rods (31). The two ends of the springs (32) abut against the fixed plate (123) and the lifting plate (33) respectively. An arc-shaped block (35) is fixedly installed at the bottom of the lifting plate (33). A rotating rod (36) is rotatably installed on the rotating hole (122). One end of the rotating rod (36) extends into the inner cavity (121) and rotates on the inner wall of the inner cavity (121). An elliptical block (37) is fixedly fitted on the outer wall of the rotating rod (36). The horizontal end of the elliptical block (37) contacts the arc-shaped block (35).

7. A hinge according to claim 6 that enables rapid alignment of the upper and lower hinge axes, characterized in that: A knob is fixedly connected to one end of the rotating rod (36) that passes through the rotating hole (122), and an anti-slip rubber pad is provided on the knob.

8. A hinge according to claim 5 that enables rapid alignment of the upper and lower hinge axes, characterized in that: The calibration unit includes calibration rods (38) fixedly installed on both sides of the lifting plate (33). The top of the calibration rods (38) passes through the side groove (1232) and the through hole (124) in sequence and then extends into the movable groove (141).

9. A hinge according to claim 6 that enables rapid alignment of the upper and lower hinge axes, characterized in that: The lifting plate (33) has sliding holes at the four corners of its top, and the sliding holes are in sliding fit with the fixing rod (31).

10. A hinge according to claim 9 that enables rapid alignment of the upper and lower hinge axes, characterized in that: The top of the lifting plate (33) is fixed with an installation ring (34), and the top rod (41) passes through the through hole (1231) and rotates to fit on the installation ring (34).

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