A self-closing page with adjustable speed

Abstract

The invention discloses a self-closing leaf with adjustable speed, comprising a shaft, a shaft sleeve, a shaft core, a needle roller, a force storage spring, an oil return spring, an oil retaining seal ring, an oil control needle and an oil filter core; the shaft core is provided with a rod part and a piston part, the upper end of the rod part is connected to the needle roller, and the lower end of the rod part is connected to the piston part; the rod part is provided with a hollow channel extending along its axis, and the middle part of the lower end of the piston part is provided with a concave cavity connected to the hollow channel and opening downward; the oil filter core can be arranged in the concave cavity movably up and down, and the oil control needle is provided with a conical needle head pointing to the oil filter core; the center position of the oil filter core is provided with a first oil passage channel for the oil control needle to be inserted; the outer periphery of the oil filter core is formed with a second oil passage channel; the upper end of the oil filter core is provided with a first seal ring; the piston part is also provided with a third oil passage channel that can flow the hydraulic oil to one side of the oil retaining seal ring. The invention can realize both fast and easy opening and slow automatic closing, and has the advantages of simple structure, adjustable hydraulic oil flow rate, durability and safety.

Description

Technical Field

[0001] The invention relates to a hinge, in particular to a self-closing hinge with adjustable speed. Background Art

[0002] At present, traditional door hinges are folding hinges, where the main hinge and the auxiliary hinge are hinged and fixedly installed on the door frame and the door panel, which cannot play a buffering role in door closing, and cannot control the speed of door closing. When closing the door, if there is a large external force, the door panel and the door frame will collide violently, making a loud noise, and the violent collision is likely to cause excessive interaction force between the door panel and the door frame, which is easy to cause damage to the door panel or door frame, affecting the service life of the door frame and door panel, and there are certain safety hazards. In order to avoid the various defects of the above-mentioned folding hinges, door hinges that have a buffering effect on door closing have gradually emerged on the market.

[0003] Most buffer hinges use direct-push buffers, which require drilling holes in the door for installation, making the installation of buffer hinges complicated and limiting their scope of use. For example, hollow door frames such as plastic steel door frames cannot be installed. A few other buffer hinges use rotary dampers, which are available in one-way and two-way types. To achieve door closing buffering, only one-way dampers can be used. The one-way damper of the buffer hinge has a damping effect throughout the entire door closing stroke. The one-way damper has a longer working time during the door closing stroke. Frequent door closing will easily cause the one-way damper to reach its life cycle and lose its function of buffering door closing. Summary of the invention

[0004] The purpose of the present invention is to provide a self-closing leaf with adjustable speed, which can be opened quickly and easily, and closed slowly and automatically, and has the advantages of simple structure, bidirectional adjustable hydraulic oil flow rate, durability and safety.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] A self-closing leaf with adjustable speed, comprising a right leaf piece, a left leaf piece, a shaft rod, a sleeve, a shaft core, a needle roller, a force storage spring, an oil return spring, an oil retaining seal and a hydraulic control assembly; the sleeve is fixedly connected to the left leaf piece, and the sleeve is provided with a straight groove; the shaft rod is fixedly connected to the right leaf piece, the shaft rod is inserted into the sleeve and slidably cooperates with the sleeve, and the shaft rod is provided with a spiral groove; the shaft core is movably arranged in the middle of the cavity of the shaft rod, and the shaft core is provided with a rod portion and a piston portion, the upper end of the rod portion is connected to the needle roller, and the lower end of the rod portion is connected to the The piston part is connected, and a dynamic sealing connection is formed between the outer periphery of the piston part and the cavity wall of the shaft rod; the rod part is provided with a hollow channel extending along its axis, and the middle part of the lower end of the piston part is provided with a concave cavity connected to the hollow channel and opening downward; the needle roller is perpendicular to the axis of the shaft core and the two ends of the needle roller are respectively connected to the spiral groove and the straight groove; the force storage spring is inserted in the upper part of the cavity of the shaft rod, and the lower end of the force storage spring is against the needle roller; the return oil spring and the oil retaining seal ring are both mounted on the rod part, and the return oil spring The upper end abuts against a boss fixed on the inner circumferential wall of the shaft rod, the lower end of the oil return spring abuts against the upper end of the oil retaining seal ring, and a dynamic sealing connection is formed between the outer periphery of the oil retaining seal ring and the cavity wall of the shaft rod; a sealed oil chamber is formed below the shaft core, and the sealed oil chamber is filled with hydraulic oil; the oil pressure control component is arranged at the lower part of the cavity of the shaft rod, and the oil pressure control component includes an oil control needle and an oil filter core, and the oil filter core can be movably arranged in the concave cavity up and down, and the oil control needle is arranged along the axis of the shaft core, and the oil control needle is provided with a needle pointing to the oil filter core a conical needle head; a first oil passage for inserting the oil control needle is provided at the center of the oil filter core, and the first oil passage is communicated with the hollow channel; a second oil passage is formed between the outer periphery of the oil filter core and the cavity wall of the concave cavity, and the second oil passage is communicated with the hollow channel; a first sealing ring for disconnecting the connection between the second oil passage and the hollow channel is provided at the upper end of the oil filter core; the piston part is also provided with a third oil passage capable of directing the hydraulic oil to one side of the oil retaining sealing ring, and the third oil passage is communicated with the hollow channel.

[0007] As a preferred embodiment of the present invention, the spiral groove is provided with an oblique groove and a horizontal groove which are interconnected; the rotation range of the oblique groove is between 0 degrees and 90 degrees; the rotation range of the horizontal groove is between 90 degrees and 170 degrees.

[0008] As a preferred embodiment of the present invention, a T-shaped nail and a round head column are provided between the force storage spring and the rolling needle, the lower end of the force storage spring is sleeved on the nail rod of the T-shaped nail, the nail head of the T-shaped nail abuts against the upper round head of the round head column, and the lower end face of the round head column abuts against the rolling needle.

[0009] As a preferred solution of the present invention, the upper end of the shaft is threadedly connected with a force adjusting screw, and the lower end of the force adjusting screw abuts against the upper end of the force storage spring.

[0010] As a preferred solution of the present invention, a sealing screw is threadedly connected to the lower end of the shaft rod, and a second sealing ring is provided between the outer periphery of the sealing screw and the cavity wall of the shaft rod.

[0011] As a preferred embodiment of the present invention, a threaded hole and a countersunk hole which are interconnected are provided in the middle portion of the sealing screw, the threaded hole is located above the countersunk hole, a speed regulating screw is threadedly connected to the threaded hole, the upper end of the speed regulating screw is connected to the lower end of the oil control needle, and a third sealing ring is provided between the outer periphery of the speed regulating screw and the hole wall of the countersunk hole.

[0012] As a preferred embodiment of the present invention, the oil retaining sealing ring includes a retaining ring and a Y-shaped sealing ring, and the retaining ring and the Y-shaped sealing ring are sequentially mounted on the rod portion of the shaft core from top to bottom, the upper end of the retaining ring abuts against the lower end of the oil return spring, and the lower end of the retaining ring abuts against the upper end of the Y-shaped sealing ring.

[0013] As a preferred solution of the present invention, a retaining spring for preventing the oil filter element from falling out of the concave cavity is provided on the inner wall of the concave cavity on one side close to the oil cavity.

[0014] As a preferred solution of the present invention, an anti-wear ring is provided at the contact point between the left leaf sheet and the right leaf sheet.

[0015] As a preferred solution of the present invention, the upper and lower ends of the shaft rod are respectively covered with decorative covers.

[0016] Compared with the prior art, the speed-adjustable self-closing leaf provided by the present invention has the following beneficial effects:

[0017] When the left leaf is rotated and opened relative to the right leaf, the needle moves upward under the action of the spiral groove and the straight groove, and compresses the force storage spring to store force; the shaft core connected to the needle roller also moves upward with the needle roller, increasing the volume of the sealed oil chamber, so that the hydraulic oil between the piston part of the shaft core and the oil retaining seal ring flows into the hollow channel through the third oil passage, and the oil filter core moves downward under the hydraulic action of the hollow channel to release the seal of the first seal ring, so that the second oil passage and the hollow channel are connected. At this time, the hydraulic oil in the hollow channel can quickly flow into the sealed oil chamber through the second oil passage; as the shaft core moves upward As the shaft core moves upward, the oil return spring decompresses the pressure to push the oil retaining seal ring downward, and the hydraulic oil between the piston part of the shaft core and the oil retaining seal ring quickly flows back to the sealed oil chamber through the third oil passage, the hollow channel, the first oil passage, and the second oil passage. The oil flow rate to the sealed oil chamber increases accordingly, thereby reducing the resistance when the left leaf is rotated open relative to the right leaf, and achieving quick and easy opening.

[0018] When the left leaf is rotated and closed relative to the right leaf, the force storage spring is decompressed, pushing the needle roller to move downward under the action of the spiral groove and the straight groove, and the shaft core connected to the needle roller also moves downward with the needle roller, compressing the volume of the sealing oil chamber. The oil filter core moves upward under the hydraulic action of the sealing oil chamber, so that the first sealing ring disconnects the connecting channel between the second oil passage and the hollow channel. At this time, the hydraulic oil in the sealing oil chamber can only slowly flow into one side of the oil retaining ring (that is, the cavity formed between the piston part of the shaft core and the oil retaining ring) through the first oil passage, the hollow channel, and the third oil passage in sequence; as the shaft core moves When the cam is in the air, it moves in a direction that the oil pressure is too low, and when the cam is in the air, it moves in a direction that the oil pressure is too high ...

[0019] It can be seen that the speed-adjustable self-closing leaf of the present invention can be opened quickly and easily, and can also be closed slowly and automatically, and has the advantages of simple structure, bidirectional adjustable hydraulic oil flow rate, durability and safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings of the embodiment are briefly introduced below.

[0021] Figure 1It is a structural schematic diagram of a self-closing page with adjustable speed according to an embodiment of the present invention;

[0022] Figure 2 It is a partial enlarged view of the speed-adjustable self-closing page of an embodiment of the present invention;

[0023] Figure 3 It is a schematic diagram of the structure of the shaft;

[0024] Figure 4 It is a schematic diagram of the structure of the sleeve.

[0025] Markings in the figure:

[0026] Right leaf 1; left leaf 2; shaft 3; sleeve 4; shaft core 5; needle roller 6; force storage spring 7; oil return spring 8; oil retaining seal 9; sealed oil chamber 10; oil control needle 11; oil filter element 12; first seal 13; T-nail 14; round head column 15; force adjustment screw 16; sealing screw 17; second seal 18; speed adjustment screw 19; third seal 20; retaining ring 21; anti-wear ring 22; decorative cover 23; spiral groove 31; boss 32; straight groove 41; rod 51; piston 52; hollow channel 53; concave cavity 54; retaining ring 91; Y-type seal 92; conical needle head 111; first oil passage 121; second oil passage 122; third oil passage 521; inclined groove 311; horizontal groove 312; threaded hole 171; countersunk hole 172. DETAILED DESCRIPTION

[0027] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0028] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0029] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0030] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0031] like Figures 1 to 4As shown, the speed-adjustable self-closing leaf of the embodiment of the present invention comprises a right leaf piece 1, a left leaf piece 2, a shaft rod 3, a sleeve 4, a shaft core 5, a needle roller 6, a force storage spring 7, an oil return spring 8, an oil retaining seal 9 and a hydraulic control assembly; the sleeve 4 is fixedly connected to the left leaf piece 2, and the sleeve 4 is provided with a straight groove 41; the shaft rod 3 is fixedly connected to the right leaf piece 1, the shaft rod 3 is inserted into the sleeve 4 and slidably cooperates with the sleeve 4, and the shaft rod 3 is provided with a spiral groove 31; the shaft core 5 is movably arranged in the middle of the cavity of the shaft rod 3, and the shaft core 5 is provided with a rod portion 51 and a piston portion 52, the upper end of the rod portion 51 is connected to the needle roller 6, and the rod portion 5 The lower end of 1 is connected to the piston part 52, and the outer periphery of the piston part 52 forms a dynamic sealing connection with the cavity wall of the shaft rod 3; the rod part 51 is provided with a hollow channel 53 extending along its axis, and the middle part of the lower end of the piston part 52 is provided with a concave cavity 54 connected with the hollow channel 53 and opening downward; the needle roller 6 is perpendicular to the axis of the shaft core 5 and the two ends of the needle roller 6 are respectively connected to the spiral groove 31 and the straight groove 41; the force storage spring 7 is inserted in the upper part of the cavity of the shaft rod 3, and the lower end of the spring is against the needle roller 6; the oil return spring 8 and the oil retaining seal ring 9 are both sleeved on the rod part 51, and the upper end of the oil return spring 8 is connected to the straight groove 41. The boss 32 fixed on the inner peripheral wall of the shaft rod 3 is pressed against the lower end of the oil return spring 8 and the upper end of the oil retaining seal ring 9, and the outer periphery of the oil retaining seal ring 9 and the cavity wall of the shaft rod 3 form a dynamic sealing connection; a sealed oil chamber 10 is formed below the shaft core 5, and the sealed oil chamber 10 is filled with hydraulic oil; the oil pressure control component is arranged at the lower part of the cavity of the shaft rod 3, and the oil pressure control component includes an oil control needle 11 and an oil filter core 12, and the oil filter core 12 is movably arranged in the concave cavity 54, and the oil control needle 11 is arranged along the axis of the shaft core 5, and the oil control needle 11 is provided with a conical needle head 111 pointing to the oil filter core 12; A first oil passage 121 for inserting the oil control needle 11 is provided at the center of the oil filter core 12, and the first oil passage 121 is connected to the hollow passage 53; a second oil passage 122 is formed between the outer periphery of the oil filter core 12 and the cavity wall of the concave cavity 54, and the second oil passage 122 is connected to the hollow passage 53; a first sealing ring 13 for disconnecting the connection between the second oil passage 122 and the hollow passage 53 is provided at the upper end of the oil filter core 12; the piston part 52 is also provided with a third oil passage 521 capable of directing the hydraulic oil to the side of the oil retaining sealing ring 9, and the third oil passage 521 is connected to the hollow passage 53.

[0032] When the left leaf 2 is rotated and opened relative to the right leaf 1, the needle roller 6 moves upward under the action of the spiral groove 31 and the straight groove 41, and compresses the force storage spring 7 to store force; the shaft core 5 connected to the needle roller 6 also moves upward with the needle roller 6, increasing the volume of the sealed oil chamber 10, so that the hydraulic oil between the piston part 52 of the shaft core 5 and the oil retaining seal ring 9 flows into the hollow channel 53 through the third oil passage 521, and the oil filter core 12 moves downward under the hydraulic action of the hollow channel 53 to release the seal of the first seal ring 13, so that the second oil passage 122 is connected to the hollow channel 53. At this time, the hydraulic oil in the hollow channel 53 can quickly flow into the sealed oil chamber 10 through the second oil passage 122; as the shaft core 5 moves upward, the hydraulic oil between the piston part 52 of the shaft core 5 and the oil retaining seal ring 9 flows into the hollow channel 53 through the third oil passage 521. As the shaft core 5 moves upward, the oil control needle 11 gradually separates from the first oil passage 121, and the gap between the conical needle head 111 of the oil control needle 11 and the first oil passage 121 gradually increases, thereby increasing the flow rate of the hydraulic oil returning to the sealed oil chamber 10; when the shaft core 5 moves upward, the oil return spring 8 reduces the pressure, pushes the oil retaining seal 9 to move downward, and quickly returns the hydraulic oil between the piston part 52 of the shaft core 5 and the oil retaining seal 9 to the sealed oil chamber 10 through the third oil passage 521, the hollow channel 53, the first oil passage 121, and the second oil passage 122, and the oil flow rate to the sealed oil chamber 10 increases accordingly, thereby reducing the resistance when the left leaf 2 rotates to open relative to the right leaf 1, and achieving quick and easy opening.

[0033] When the left leaf 2 rotates and closes relative to the right leaf 1, the force storage spring 7 is decompressed, pushing the needle roller 6 to move downward under the action of the spiral groove 31 and the straight groove 41, and the shaft core 5 connected to the needle roller 6 also moves downward with the needle roller 6, compressing the volume of the sealed oil chamber 10. The oil filter core 12 moves upward under the hydraulic action of the sealed oil chamber 10, so that the first sealing ring 13 disconnects the connecting channel between the second oil passage 122 and the hollow channel 53. At this time, the hydraulic oil in the sealed oil chamber 10 can only slowly flow into the side of the oil retaining seal ring 9 (that is, the cavity formed between the piston part 52 of the shaft core 5 and the oil retaining seal ring 9) through the first oil passage 121, the hollow channel 53, and the third oil passage 521 in sequence; As the shaft core 5 moves downward, the oil control needle 11 gradually penetrates into the first oil passage 121, gradually reducing the opening between the conical needle head 111 of the oil control needle 11 and the first oil passage 121, and then gradually reducing the flow rate of the hydraulic oil to the side of the oil retaining seal 9; when the shaft core 5 moves downward, the hydraulic oil flowing into the cavity between the piston part 52 of the shaft core 5 and the oil retaining seal 9 can push the oil retaining seal 9 to move upward relative to the piston part 52 of the shaft core 5, and compress the return oil spring 8 to store force, and the oil flow rate of the sealed oil chamber 10 to the side of the oil retaining seal 9 becomes smaller accordingly, thereby increasing the resistance when the left leaf 2 rotates and closes relative to the right leaf 1, and realizing slow automatic closing.

[0034] It can be seen that the speed-adjustable self-closing leaf of the embodiment of the present invention can be opened quickly and easily, and can also be closed slowly and automatically, and has the advantages of simple structure, bidirectional adjustable hydraulic oil flow rate, durability and safety.

[0035] It should be noted that the spiral groove 31 is provided with an oblique groove 311 and a horizontal groove 312 which are interconnected; the rotation range of the oblique groove 311 is between 0 degrees and 90 degrees; and the rotation range of the horizontal groove 312 is between 90 degrees and 170 degrees. When the self-closing leaf of the present embodiment is applied to a door, the left leaf 2 is installed on the door leaf, and the right leaf 1 is installed on the door frame, wherein 0 degrees of the inclined groove 311 is the door closing angle, and 90 degrees is the door opening initial angle. When the door opening angle is less than 90 degrees, if the external force is removed, the needle roller 6 moves downward along the straight groove 41 of the inclined groove 311 under the action of the storage spring 7, and at the same time drives the shaft sleeve 4 to rotate relative to the shaft rod 3. When the shaft sleeve 4 rotates, it drives the left leaf 2 to rotate relative to the right leaf 1, thereby realizing automatic door closing; when the door leaf is opened to between 90 degrees and 170 degrees, the needle roller 6 enters the horizontal groove 312. At this time, even if the external force is removed, the needle roller 6 will not move downward under the action of the storage spring 7. Therefore, the door leaf can be arbitrarily stopped and positioned under the action of the horizontal groove 312.

[0036] Exemplarily, a T-shaped nail 14 and a round-headed column 15 are provided between the force storage spring 7 and the needle roller 6, the lower end of the force storage spring 7 is sleeved on the nail rod of the T-shaped nail 14, the nail head of the T-shaped nail 14 abuts against the upper round head of the round-headed column 15, and the lower end face of the round-headed column 15 abuts against the needle roller 6. Thus, the force storage spring 7 transmits pressure to the needle roller 6 through the T-shaped nail 14 and the round-headed column 15, which can reduce the friction generated when the force storage spring 7 and the needle roller 6 rotate relative to each other.

[0037] Exemplarily, the upper end of the shaft rod 3 is threadedly connected with a force adjusting screw 16, and the lower end of the force adjusting screw 16 is pressed against the upper end of the force storage spring 7, so that the force adjusting screw 16 can be twisted by an allen key to compress the force storage spring 7 downward to increase the elastic force to increase the door closing force, and conversely, release the force storage spring 7 upward to reduce the elastic force to reduce the door closing force.

[0038] Exemplarily, the lower end of the shaft rod 3 is threadedly connected with a sealing screw 17, and a second sealing ring 18 is provided between the outer periphery of the sealing screw 17 and the cavity wall of the shaft rod 3; the middle part of the sealing screw 17 is provided with a threaded hole 171 and a countersunk hole 172 which are interconnected, and the threaded hole 171 is located above the countersunk hole 172, and the threaded hole 171 is threadedly connected with a speed regulating screw 19, and the upper end of the speed regulating screw 19 is connected to the lower end of the oil control needle 11, and a third sealing ring 20 is provided between the outer periphery of the speed regulating screw 19 and the hole wall of the countersunk hole 172. Thus, the sealing screw 17 is sealed with the shaft rod 3 through the sealing ring and the second sealing ring 18 to prevent oil leakage; the speed regulating screw 19 is sealed with the inner wall of the countersunk hole 172 of the sealing screw 17 through the third sealing ring 20 to prevent oil leakage; the speed regulating screw 19 can be twisted by a hexagonal key to drive the oil control needle 11 to move up and down, thereby adjusting the depth of the oil control needle 11 inserted into the first oil passage 121 to control the flow rate of the hydraulic oil, thereby realizing the adjustable oil flow speed between the sealing oil chamber 10 and one side of the oil retaining sealing ring 9 (i.e., the cavity formed between the piston part 52 of the shaft core 5 and the oil retaining sealing ring 9).

[0039] Exemplarily, a retaining spring 21 is provided on the inner wall of the concave cavity 54 on one side close to the oil cavity to prevent the oil filter element 12 from escaping from the concave cavity 54 and facilitate assembly and disassembly.

[0040] Exemplarily, a plurality of teeth are evenly distributed on the outer circumference of the oil filter core 12 , and the end faces of the teeth are slidably matched with the cavity wall of the concave cavity 54 , and the second oil passage 122 is formed between two adjacent teeth.

[0041] Exemplarily, the oil retaining seal ring 9 includes a retaining ring 91 and a Y-shaped seal ring 92, which are sequentially mounted on the rod portion 51 of the shaft core 5 from top to bottom, the upper end of the retaining ring 91 abuts against the lower end of the oil return spring 8, and the lower end of the retaining ring 91 abuts against the upper end of the Y-shaped seal ring 92. The inner cavity and outer wall of the Y-shaped seal ring 92 abut against the rod portion 51 of the shaft core 5 and the cavity wall of the shaft rod 3, respectively, to seal; the retaining ring 91 can keep the Y-shaped seal ring 92 balanced in reciprocating motion to avoid oil leakage.

[0042] Exemplarily, an anti-wear ring 22 is provided at the contact point between the left leaf sheet 2 and the right leaf sheet 1 to reduce the friction and wear generated when the left leaf sheet 2 and the right leaf sheet 1 rotate.

[0043] Exemplarily, the upper and lower ends of the shaft rod 3 are respectively covered with decorative covers 23 , and a through hole is provided at the center of the decorative cover 23 to facilitate adjustment of the force adjustment screw 16 and the speed adjustment screw 19 therein.

[0044] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A self-closing page with adjustable speed, It is characterized in that It includes a right leaf piece, a left leaf piece, a shaft rod, a shaft sleeve, a shaft core, a needle roller, a force storage spring, an oil return spring, an oil retaining seal ring and a hydraulic control component; The shaft sleeve is fixedly connected to the left leaf, and the shaft sleeve is provided with a straight groove; The shaft is fixedly connected to the right leaf, the shaft is inserted into the shaft sleeve and slidably matched with the shaft sleeve, and the shaft is provided with a spiral groove; The shaft core is movably arranged in the middle of the cavity of the shaft rod, and the shaft core is provided with a rod portion and a piston portion. The upper end of the rod portion is connected to the needle roller, and the lower end of the rod portion is connected to the piston portion. The outer periphery of the piston portion and the cavity wall of the shaft rod form a dynamic sealing connection; the rod portion is provided with a hollow channel extending along its axis, and the middle of the lower end of the piston portion is provided with a concave cavity connected to the hollow channel and opening downward; The needle roller is perpendicular to the axis of the shaft core and two ends of the needle roller are respectively connected to the spiral groove and the straight groove; The force storage spring is inserted into the upper part of the cavity of the shaft rod, and the lower end of the force storage spring is against the roller needle; The oil return spring and the oil retaining seal ring are both sleeved on the rod portion, the upper end of the oil return spring abuts against a boss fixed on the inner peripheral wall of the shaft rod, the lower end of the oil return spring abuts against the upper end of the oil retaining seal ring, and a dynamic sealing connection is formed between the outer periphery of the oil retaining seal ring and the cavity wall of the shaft rod; A sealed oil chamber is formed below the shaft core, and the sealed oil chamber is filled with hydraulic oil; The oil pressure control assembly is arranged at the lower part of the cavity of the shaft rod, and the oil pressure control assembly includes an oil control needle and an oil filter core. The oil filter core is movably arranged in the concave cavity, and the oil control needle is arranged along the axis of the shaft core. The oil control needle is provided with a conical needle head pointing to the oil filter core; a first oil passage for the oil control needle to be inserted is provided at the center of the oil filter core, and the first oil passage is communicated with the hollow passage; a second oil passage is formed between the outer periphery of the oil filter core and the cavity wall of the concave cavity, and the second oil passage is communicated with the hollow passage; a first sealing ring for disconnecting the second oil passage from the hollow passage is provided at the upper end of the oil filter core; The piston part is also provided with a third oil passage which can make the hydraulic oil flow to one side of the oil retaining seal ring, and the third oil passage is communicated with the hollow passage.

2. The speed-adjustable self-closing leaf according to claim 1, It is characterized in that The spiral groove is provided with an oblique groove and a horizontal groove which are interconnected; the rotation range of the oblique groove is between 0 degrees and 90 degrees; the rotation range of the horizontal groove is between 90 degrees and 170 degrees.

3. The speed-adjustable self-closing leaf according to claim 1, It is characterized in that A T-shaped nail and a round head column are provided between the force storage spring and the rolling needle. The lower end of the force storage spring is sleeved on the nail rod of the T-shaped nail. The nail head of the T-shaped nail abuts against the upper round head of the round head column, and the lower end face of the round head column abuts against the rolling needle.

4. The speed-adjustable self-closing leaf according to claim 1, It is characterized in that The upper end of the shaft rod is threadedly connected with a force adjusting screw, and the lower end of the force adjusting screw abuts against the upper end of the force storage spring.

5. The speed-adjustable self-closing leaf according to claim 1, It is characterized in that The lower end of the shaft is threadedly connected with a sealing screw, and a second sealing ring is arranged between the outer periphery of the sealing screw and the cavity wall of the shaft.

6. The speed-adjustable self-closing leaf according to claim 5, It is characterized in that A threaded hole and a countersunk hole which are interconnected are provided in the middle of the sealing screw. The threaded hole is located above the countersunk hole. A speed regulating screw is threadedly connected to the threaded hole. The upper end of the speed regulating screw is connected to the lower end of the oil control needle. A third sealing ring is provided between the outer periphery of the speed regulating screw and the hole wall of the countersunk hole.

7. The speed-adjustable self-closing leaf according to claim 1, It is characterized in that The oil retaining sealing ring includes a retaining ring and a Y-shaped sealing ring, which are sequentially mounted on the rod portion of the shaft core from top to bottom, the upper end of the retaining ring abuts against the lower end of the oil return spring, and the lower end of the retaining ring abuts against the upper end of the Y-shaped sealing ring.

8. The speed-adjustable self-closing leaf according to claim 1, It is characterized in that A retaining spring for preventing the oil filter element from falling out of the concave cavity is provided on an inner wall of one side of the concave cavity close to the oil cavity.

9. The speed-adjustable self-closing leaf according to claim 1, It is characterized in that An anti-wear ring is provided at the contact position between the left leaf sheet and the right leaf sheet.

10. The speed-adjustable self-closing leaf according to claim 1, It is characterized in that The upper and lower ends of the shaft rod are respectively covered with decorative covers.

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