A door closer with a stop function

Abstract

This invention discloses a door closer with a built-in door-stopping function, comprising a cylinder body and its internal cylinder bore and shaft bore. Left and right piston rods are located within the cylinder bore, and a rotating shaft with a cam is positioned between the two piston rods. Rollers are located at the ends of both piston rods and are pressed against the outer contour surface of the cam by a left push spring and a right compression spring, respectively. Concave limiting grooves are provided on opposite sides of the cam's protrusions; the door stops when the rollers engage with the limiting grooves. Multiple independently adjustable speed control valves are provided on the cylinder body to control the opening, closing, and final buffer speeds. An internal oil circuit switching mechanism controlled by a plunger, push rod, and spring is located within the left piston rod, which, in conjunction with a check valve, controls the oil flow direction at different stages. This invention features a compact structure, reliable door-stopping, multi-stage adjustable closing speed, and easily adjustable stopping angle and closing force. It is suitable for various types of swing doors and is worthy of widespread application.

Description

Technical Field

[0001] This invention relates to a device in the field of hardware accessories and hydraulic damping technology, particularly a door closer, and especially a door closer with a built-in door stop function. Background Technology

[0002] Door closers are devices used to control the automatic closing of doors, widely used in commercial buildings, residential buildings, and fire doors. Traditional door closers typically only have a one-way closing function and lack the ability to stop the door (i.e., keep the door still at a specific opening angle). Some door closers with a stopping function require the additional installation of electromagnetic locks or mechanical stops, resulting in complex structures, inconvenient installation and debugging, and fixed stopping positions that cannot be adjusted according to actual needs. In addition, the closing speed of existing door closers mostly relies on a single speed control valve, making it difficult to achieve independent speed control for each stage of opening, closing, and final buffering, leading to large closing impact, high noise, or incomplete closure. With the increasing requirements for building intelligence, the market urgently needs a door closer that is compact in structure, reliable in stopping, adjustable in speed, and easy to install.

[0003] Chinese utility model patent CN 202645244 U discloses a concealed door closer, which includes a cylindrical valve body with end caps at the front and rear ends, upper and lower pressure caps on the upper and lower walls of the valve body, and front and rear pistons inside the valve cavity, connected by a slide plate. The right end of the rear piston is connected to a compression spring located in the right cavity of the valve body. An oil passage is provided on the left end of the valve body wall, and rollers are mounted on the front and rear pistons. A transmission cam that cooperates with the rollers is provided in a through hole penetrating the valve body wall and the slide plate. The valve body wall is thin. This door closer has a single function, no door-stopping function, and relies on a single speed control valve, lacking multi-stage adjustable door speed function. Summary of the Invention

[0004] The present invention aims to overcome the shortcomings of the prior art by providing a door closer with a built-in door-stopping function that can stop the door at any angle and has a multi-stage adjustable closing speed, thus meeting users' needs for high performance, high reliability and flexible adjustment of door closers.

[0005] The technical solution adopted by this invention to solve its technical problem is as follows: This door closer with built-in door stopping function includes a cylinder body, a cylinder bore and a shaft hole perpendicular to the cylinder bore, a left piston rod and a right piston rod inserted into the cylinder bore, a rotating shaft rotatably connected to the left piston rod and the right piston rod and located at the shaft hole, a cam fixed on the rotating shaft, a left sealing cover threadedly closed at the left end of the cylinder bore, a first roller rotatably connected to the right end of the left piston rod, a first blind hole on the left piston rod, a first one-way valve hole communicating with the first blind hole on the left piston rod, a first sealing ball fitted with the first one-way valve hole installed in the first blind hole, and a left sealing ball on the left piston rod. A left push spring is installed between the left sealing cover and the right side of the cylinder body, pressing the first roller towards the outer contour surface of the cam. A second roller is rotatably connected to the left end of the right piston rod. A right pressure spring is installed between the right side of the right piston rod and the right side of the cylinder bore, pressing the second roller towards the outer contour surface of the cam. The right pressure spring has a first transverse channel opening inside the cylinder body and communicating with the shaft hole. A first speed regulating valve hole is opened on the right side of the cylinder body, and a first speed regulating valve is installed on the first speed regulating valve hole. A first transverse blind hole is opened on the cylinder body, communicating with the first speed regulating valve hole. The first transverse blind hole and the cylinder bore are connected through a first connecting hole. The valve port is connected to the first transverse channel via a second channel hole; the left push spring has a second transverse channel opening in the cylinder body at its side end, and a second blind hole opening in the cylinder body at its side end. A second one-way valve port communicating with the second blind hole is opened on the cylinder body. A second sealing ball that mates with the second one-way valve port is installed in the second blind hole. A pressure block is fitted to the side end of the second sealing ball. A force-adjusting valve block is threaded to the side end of the second blind hole. A first compression spring is installed between the force-adjusting valve block and the pressure block. The second transverse channel and the second blind hole are connected via a second connecting hole, and the second connecting hole is located inside the second sealing ball. The outer side of the second one-way valve port is connected to the cylinder body. The holes are connected by a third connecting hole, and the outer end of the second transverse channel is connected to the cylinder bore by a fourth connecting hole; a second speed regulating valve hole is opened on the left side of the cylinder body, and a second speed regulating valve is installed on the second speed regulating valve hole; a first flow hole is opened on the cylinder body that is connected to the second speed regulating valve hole and the shaft hole, and the second speed regulating valve hole and the cylinder bore are connected by the second flow hole; a third speed regulating valve hole is opened on the left side of the cylinder body, and a third speed regulating valve is installed on the third speed regulating valve hole; a third flow hole is opened on the cylinder body that is connected to the third speed regulating valve hole and the shaft hole, and the third speed regulating valve hole and the cylinder bore are connected by a fourth flow hole;The left piston rod has a first annular groove and a second annular groove that communicate with the inlet end of the second flow hole and the inlet end of the fourth flow hole, respectively. The center of the left piston rod has an insertion hole and a through hole with a cross-section smaller than the insertion hole that are interconnected. An insertion rod is inserted into the insertion hole. A push rod is fixed at the end of the insertion rod, which is in clearance fit with the through hole and corresponds to the position of the first blind hole. The push rod has a radial notch at its head for hydraulic oil flow. A third blind hole is opened on the side end of the insertion rod. A second compression spring is installed between the side end of the third blind hole and the side end of the insertion hole. The left piston rod has a pair of radial holes that are arranged opposite each other. The two radial holes connect the first annular groove and the second annular groove to the insertion hole, respectively. A third annular groove is opened on the outer contour of the insertion rod. A radial channel hole is opened on the third annular groove. A connecting channel is opened on the insertion rod to connect the third blind hole to the cylinder bore. A rubber sealing gasket is tightly fitted between the insertion rod and the push rod. An inward limiting groove is provided on the opposite side of the cam protrusion. The cylinder block, cylinder bore, shaft bore, left piston rod, right piston rod, rotating shaft, cam, and first one-way valve bore here function to control the opening and closing speeds and the flow direction of hydraulic oil. The left push spring functions to reset the left piston rod to the right, thus pressing the outer ring of the first roller against the outer contour surface of the cam. The movement of the left piston rod adjusts the door opening stop between 85° and 180° and the closing force between 85° and 0°. The right pressure spring provides automatic push for closing the door. The functions of the first transverse channel, first speed regulating valve hole, first speed regulating valve, first transverse blind hole, first connecting hole, and second channel hole are to provide a flow channel for hydraulic oil when the right piston rod moves, thereby enabling the right piston rod to move smoothly. The first speed regulating valve can adjust the orifice size of the first speed regulating valve hole, thereby adjusting the moving speed and force of the right piston rod, and consequently, adjusting the opening speed and force, and closing speed and force. The functions of the fourth connecting hole, second transverse channel, second connecting hole, third connecting hole, second one-way valve hole, second sealing ball, pressure block, force regulating valve block, first compression spring, and second blind hole are to allow arbitrary stopping of the door within the opening angle range of 85° to 180° and to control the force of manually pulling the door, meeting user needs. The functions of the first flow hole, second speed regulating valve hole, second speed regulating valve, and second flow hole are to adjust and control the closing speed between 85° and 15° when closing. The functions of the third flow hole, third speed regulating valve, third speed regulating valve hole, and second channel hole are to adjust and control the closing speed between 85° and 15°. The four flow holes are used to adjust and control the closing speed and force between 15° and 0°, thus adapting to the closing force of different doors. Some doors have locks and require a fast closing speed to close, while others do not have locks and only need to be closed, with less stringent speed requirements, making it highly versatile. This invention uses the rolling motion of the first and second rollers on a cam, resulting in low friction and high torque. Unlike traditional door closers, it avoids tooth breakage and can be concealed inside the door for pushing, providing a large pushing torque.

[0006] Further improvements include a fourth speed regulating valve hole on the left side of the cylinder block, a fourth speed regulating valve installed on the fourth speed regulating valve hole, a fourth blind hole located inside the cylinder block and connected to the fourth speed regulating valve hole at the side end of the fourth speed regulating valve hole, a fifth connecting hole connecting the outer end of the fourth blind hole to the cylinder bore, and a sixth connecting hole connecting the fourth speed regulating valve hole to the cylinder bore. The functions of the fourth speed regulating valve hole, the fourth speed control valve, the fourth blind hole, the fifth connecting hole, and the sixth connecting hole are as follows: For the door closer, sometimes it is necessary to stop the door at any position between 85° and 180° when the door is open, and sometimes this function is not needed. Therefore, the fourth speed regulating valve hole, the fourth speed control valve, the fourth blind hole, the fifth connecting hole, and the sixth connecting hole provide customers with an option when this function is not needed. When the function of stopping the door at any position between 85° and 160° when the door is open is not needed, simply unscrew the fourth speed control valve to allow flow between the sixth connecting hole and the fourth blind hole. When the left piston is driven, the hydraulic oil will automatically flow from the right side of the left piston through the fifth connecting hole to the left side of the left piston through the sixth connecting hole, thus ensuring smooth flow of the hydraulic oil. At this time, the hydraulic oil will not push the second sealing ball from the third connecting hole, so that the door is either open or closed at any position between 85° and 180°, and does not have the function of stopping the door at any position between 85° and 180°.

[0007] Further improvements include a right-side sealing cover that is threaded to the right end of the cylinder bore. The purpose of this right-side sealing cover is to facilitate the machining and installation of the door closer.

[0008] Further improvements include a first circular hole and a second circular hole with a cross-section smaller than the first circular hole in the center of the right sealing cover. A rotating block is rotatably connected to the first circular hole. A limiting block that mates with the second circular hole is fixed to the left end of the rotating block. A threaded rod is fixed to the left end of the limiting block. An adjusting plate is threaded onto the threaded rod. The right end of the right pressure spring presses against the adjusting plate. An anti-rotation guide groove is opened on the cylinder body. An anti-rotation protrusion that mates with the anti-rotation guide groove is fixed on the adjusting plate. A first O-ring is installed on the rotating block. The functions of the first and second round holes, the rotating block, the limit block, the threaded rod, the adjusting plate, the anti-rotation guide groove, the anti-rotation protrusion, and the first O-ring seal are to allow the rotating block to be turned, thereby using the rotation of the threaded rod to drive the adjustment plate to move. Due to the function of the anti-rotation guide groove and the anti-rotation protrusion, the adjusting plate will not rotate with the threaded rod, but will move through the rotation of the threaded rod, thereby adjusting the distance between the right piston rod and the adjusting plate, thus adjusting the elastic force of the right pressure spring, and thus adjusting the opening force and closing speed of the door.

[0009] Further improvements include a slot on the left side of the insertion hole, into which a plug is inserted. A second O-ring is installed on the plug, and a retaining spring is engaged in the slot. The side end of the second compression spring presses against the plug. The function of the slot, plug, second O-ring, and retaining spring is to facilitate the installation of the second compression spring and reduce assembly costs.

[0010] Further improvements include a square post fixed to the top surface of the pivot, with a countersunk threaded hole on the top surface of the square post. The purpose of the square post and the countersunk threaded hole is to provide an interface for mounting the rocker arm, allowing for easy hinged installation of the rocker arm end and preventing it from loosening when the rocker arm end drives the door closer.

[0011] Further improvements include the addition of pins inserted into both the left and right piston pins, with the first and second rollers mounted on these pins. Both the left and right piston pins are also threaded with slotted screws that vertically secure the pins. The pins and slotted screws facilitate convenient and quick installation of the first and second rollers, thereby reducing processing difficulty and assembly costs.

[0012] Further improvements include the installation of a pair of needle roller bearings, one above the other, on the shaft hole. A sealing cap, threaded to the cylinder body, is located above the upper needle roller bearing. A retaining ring with a circlip, providing longitudinal support for the rotating shaft, is installed on the cylinder body. A third O-ring seal is installed on the sealing cap. The functions of the needle roller bearings, sealing cap, retaining ring, and third O-ring seal are to facilitate shaft installation and reduce machining and installation costs.

[0013] Further improvements include mounting holes on the cylinder body. These mounting holes allow for quick and easy installation and fixation of the door closer to the door frame.

[0014] Further improvements include the addition of end caps on both the left and right sealing covers, and a cover plate on the outer end face of the cylinder body. The end caps and cover plates serve to prevent dust accumulation and enhance aesthetics.

[0015] The beneficial effects of this invention are: 1) The cam drives the left and right piston rods to move, ensuring smooth operation of the door closer and preventing tooth breakage. 2) The left push spring is used to reset the left piston rod to the right, so that the outer ring of the first roller can be pressed against the outer contour surface of the cam. The movement of the left piston rod can adjust the door opening stop between 85° and 180° and the door closing force between 85° and 0°. The right pressure spring can automatically push the door to provide power for closing. 3) The first transverse channel, the first speed regulating valve orifice, the first speed regulating valve, the first transverse blind orifice, the first connecting orifice, and the second channel orifice provide a flow channel for hydraulic oil when the right piston rod moves, thereby enabling the right piston rod to move smoothly. The first speed regulating valve can adjust the orifice size of the first speed regulating valve orifice, thereby adjusting the moving speed and force of the right piston rod, and thus adjusting the opening speed and force, as well as the closing speed and force. 4) Through the fourth connecting hole, the second transverse channel, the second connecting hole, the third connecting hole, the second one-way valve hole, the second sealing ball, the pressure block, the force regulating valve block, the first compression spring, and the second blind hole, the door can be stopped at any opening angle between 85° and 180° and the force of pulling the door by hand can be controlled to meet user needs; 5) The first flow hole, the second speed regulating valve hole, the second speed regulating valve, and the second flow hole are used to adjust and control the closing speed between 85° and 15° when closing the door; the third flow hole, the third speed regulating valve, the third speed regulating valve hole, and the fourth flow hole are used to adjust and control the closing speed and force between 15° and 0° when closing the door, so as to adapt to the closing force of different doors. Some doors have locks and require a fast closing speed to close, while some doors do not have locks and only need to be closed, so the closing speed does not need to be fast, thus the door closer has strong versatility. Attached Figure Description

[0016] Figure 1 This is a perspective view of the present invention; Figure 2 The three-dimensional representation of the present invention when the end caps and cover plates are removed. Figure 1 ; Figure 3 The three-dimensional representation of the present invention when the end caps and cover plates are removed. Figure 2 ; Figure 4 for Figure 2 AA cross-section view; Figure 5 for Figure 2 BB cross-section; Figure 6 This is a cross-sectional view of the first transverse channel region in this invention; Figure 7 for Figure 6 CC section; Figure 8 This is a partial cross-section of the second transverse channel region in the present invention. Figure 1 ; Figure 9 This is the three-dimensional view of the cylinder block located at the third connecting hole in this invention. Figure 1 ; Figure 10This is a partial cross-sectional view of the first and third flow-through hole regions in this invention. Figure 2 ; Figure 11 This is the three-dimensional view of the cylinder block located at the fourth flow hole in this invention. Figure 2 ; Figure 12 This is a partial three-dimensional cross-section of the fourth blind hole region in this invention. Figure 3 ; Figure 13 This is the three-dimensional view of the cylinder block located at the sixth connecting hole in this invention. Figure 3 ; Figure 14 This is a schematic diagram of the top rod region in this invention; Figure 15 This is a schematic diagram of the structure of the first sealing ball region in this invention; Figure 16 This is a schematic diagram of the threaded rod region in this invention; Figure 17 This is a flowchart illustrating the working principle of the door in the top-open state in this invention. Figure 18 This is a flowchart illustrating the working principle of the fully closed state in this invention.

[0017] Explanation of reference numerals in the attached drawings: Cylinder block 1, Cylinder bore 1-1, Shaft bore 1-2, Anti-rotation guide groove 1-3, Mounting hole 1-4, First transverse channel 1a, First speed regulating valve hole 1b, First transverse blind hole 1c, First connecting hole 1d, Second channel hole 1e, Second transverse channel 1f, Second blind hole 1g, Second connecting hole 1h, Second one-way valve hole 1j, Third connecting hole 1k, Fourth connecting hole 1m, Second speed regulating valve hole 1n, First flow hole 1p, Second flow hole 1q, Third speed... Adjusting valve orifice 1s, third flow orifice 1t, fourth flow orifice 1u, fourth speed regulating valve orifice 1v, fourth blind orifice 1w, fifth connecting orifice 1x, sixth connecting orifice 1y, left piston column 2, first blind orifice 2-1, first one-way valve orifice 2-2, first sealing ball 2a, first annular groove 2-3, second annular groove 2-4, insertion hole 2-5, through hole 2-6, radial hole 2-7, slot 2-8, right piston column 3, rotating shaft 4, cam 4-1, concave limiting groove 4-1a, square column 4-2 Countersunk threaded hole 4-3, left sealing cover 5, first roller 6, left push spring 7, second roller 8, right compression spring 9, first speed control valve 10, second sealing ball 11, pressure block 12, force regulating valve block 13, first compression spring 14, slotted shaft screw 15, second speed control valve 16, third speed control valve 17, insert post 18, push rod 18-1, radial notch 18-1a, third blind hole 18a, third circular groove 18b, radial channel hole 18c, connecting channel 18d, second Compression spring 19, rubber gasket 20, fourth speed control valve 21, right sealing cover 22, first round hole 22-1, second round hole 22-2, turning round block 23, limit block 23-1, threaded rod 23-2, adjusting plate 24, anti-rotation protrusion 24-1, first O-ring seal 25, plug 26, second O-ring seal 26a, pin 27, snap ring 28, needle roller bearing 29, sealing cover 30, third O-ring seal 30a, snap ring retainer 31, end cover 32, cover plate 33. Detailed Implementation

[0018] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0019] Referring to the attached diagram: This door closer with a built-in door-stopping function includes a cylinder body 1. The cylinder body 1 has a cylinder bore 1-1 and a shaft bore 1-2 perpendicular to the cylinder bore 1-1. A left piston rod 2 and a right piston rod 3 are inserted and fitted into the cylinder bore 1-1. A rotating shaft 4, rotatably connected to the cylinder body 1 and located at the shaft bore 1-2, is provided between the left piston rod 2 and the right piston rod 3. A cam 4-1 is fixed on the rotating shaft 4. A left sealing cover 5 is threadedly sealed at the left end of the cylinder bore 1-1. A first roller 6 is rotatably connected to the right end of the left piston rod 2. A first blind hole 2-1 is opened on the left piston rod 2. A first one-way valve hole 2-2 communicating with the first blind hole 2-1 is opened on the left piston rod 2. A device connected to the first one-way valve hole 2-2 is installed in the first blind hole 2-1. The first sealing ball 2a is fitted together with the left piston rod 2. A left push spring 7 is installed between the left side of the left piston rod 2 and the right side of the left sealing cover 5, which presses the first roller 6 towards the outer contour surface of the cam 4-1. The left end of the right piston rod 3 is rotatably connected to the second roller 8. A right pressure spring 9 is installed between the right side of the right piston rod 3 and the right side of the cylinder bore 1-1, which presses the second roller 8 towards the outer contour surface of the cam 4-1. The right pressure spring 9 has a first transverse channel 1a that is opened in the cylinder body 1 and communicates with the shaft hole 1-2. A first speed regulating valve hole 1b is opened on the right side of the cylinder body 1. A first speed regulating valve 10 is installed on the first speed regulating valve hole 1b. A first speed regulating valve 10 is opened on the cylinder body 1 that communicates with the first speed regulating valve hole 1b. A transverse blind hole 1c is connected to the cylinder bore 1-1 via a first connecting hole 1d. A first speed regulating valve hole 1b is connected to the first transverse channel 1a via a second channel hole 1e. A second transverse channel 1f is provided on the side end of the left push spring 7, which is located inside the cylinder body 1. A second blind hole 1g is provided on the side end of the second transverse channel 1f, which is located inside the cylinder body 1. A second one-way valve hole 1j is provided on the cylinder body 1, which is connected to the second blind hole 1g. A second sealing ball 11 is installed in the second blind hole 1g, which is fitted with the second one-way valve hole 1j. A pressure block 12 is fitted on the side end of the second sealing ball 11. A force regulating valve block 13 is threadedly connected to the side end of the second blind hole 1g. The force regulating valve block 13 and the pressure block 12 are connected... A first compression spring 14 is installed. The second transverse channel 1f and the second blind hole 1g are connected by a second connecting hole 1h, and the second connecting hole 1h is located inside the second sealing ball 11. The outer side of the second one-way valve hole 1j is connected to the cylinder hole 1-1 by a third connecting hole 1k. The outer end of the second transverse channel 1f is connected to the cylinder hole 1-1 by a fourth connecting hole 1m. A second speed regulating valve hole 1n is opened on the left side of the cylinder body 1. A second speed regulating valve 16 is installed on the second speed regulating valve hole 1n. A first flow hole 1p is opened on the cylinder body 1, which is connected to the second speed regulating valve hole 1n and the shaft hole 1-2. The second speed regulating valve hole 1n is connected to the cylinder hole 1-1 by a second flow hole 1q.A third speed regulating valve hole 1s is opened on the left side of the cylinder body 1. A third speed regulating valve 17 is installed on the third speed regulating valve hole 1s. A third flow hole 1t is opened on the cylinder body 1, which communicates with the third speed regulating valve hole 1s and the shaft hole 1-2. The third speed regulating valve hole 1s and the cylinder hole 1-1 are connected by a fourth flow hole 1u. A first annular groove 2-3 and a second annular groove 2-4 are opened on the left piston rod 2, which communicate with the inlet end of the second flow hole 1q and the inlet end of the fourth flow hole 1u, respectively. An insertion hole 2-5 and a through hole 2-6 with a cross-section smaller than the insertion hole 2-5 and interconnected are opened in the center of the left piston rod 2. An insertion post 18 is inserted into the insertion hole 2-5. A push rod 18-1 is fixed at the end of the insertion post 18, which is in clearance fit with the through hole 2-6 and corresponds to the position of the first blind hole 2-1. The piston rod 18-1 has a radial notch 18-1a at its head end for hydraulic oil flow. A third blind hole 18a is opened on the side end of the insert 18. A second compression spring 19 is installed between the side end of the third blind hole 18a and the side end of the insertion hole 2-4. A pair of opposing radial holes 2-7 are opened on the left piston rod 2. The two radial holes 2-7 respectively connect the first annular groove 2-3, the second annular groove 2-4, and the insertion hole 2-5. A third annular groove 18b is opened on the outer contour of the insert 18. A radial channel hole 18c is opened on the third annular groove 18b. A connecting channel 18d is opened on the insert 18 to connect the third blind hole 18a and the cylinder bore 1-1. A rubber sealing gasket 20 is tightly fitted between the insert 18 and the push rod 18-1. An inwardly recessed limiting groove 4-1a is provided on the opposite side of the cam 4-1's protrusion.

[0020] A fourth speed regulating valve hole 1v is opened on the left side of the cylinder body 1. A fourth speed regulating valve 21 is installed on the fourth speed regulating valve hole 1v. A fourth blind hole 1w is provided on the side end of the fourth speed regulating valve hole 1v, which is opened in the cylinder body 1 and communicates with the fourth speed regulating valve hole 1v. The outer end of the fourth blind hole 1w is connected to the cylinder bore 1-1 through a fifth connecting hole 1x. The fourth speed regulating valve hole 1v is connected to the cylinder bore 1-1 through a sixth connecting hole 1y.

[0021] The right end of cylinder bore 1-1 is threaded and sealed with a right sealing cover 22.

[0022] The right sealing cover 22 has a first circular hole 22-1 and a second circular hole 22-2 with a cross-section smaller than the first circular hole 22-1. A rotating block 23 is rotatably connected to the first circular hole 22-1. A limiting block 23-1 that mates with the second circular hole 22-2 is fixed to the left end of the rotating block 23. A threaded rod 23-2 is fixed to the left end of the limiting block 23-1. An adjusting plate 24 is threadedly fitted onto the threaded rod 23-2. The right end of the right pressure spring 9 presses against the adjusting plate 24. An anti-rotation guide groove 1-3 is opened on the cylinder body 1. An anti-rotation protrusion 24-1 that mates with the anti-rotation guide groove 1-3 is fixed on the adjusting plate 24. A first O-ring 25 is installed on the rotating block 23.

[0023] A slot 2-8 is provided on the left side of the insertion hole 2-5. A plug 26 is inserted into the insertion hole 2-5. A second O-ring 26a is installed on the plug 26. A retaining spring 28 is engaged at the slot 2-8. The side end of the second compression spring 19 presses against the plug 26.

[0024] A square column 4-2 is fixed on the top surface of the rotating shaft 4, and a countersunk threaded hole 4-3 is opened on the top surface of the square column 4-2.

[0025] Pins 27 are inserted into both the left piston rod 2 and the right piston rod 3. The first roller 6 and the second roller 8 are both installed at the pins 27. Slotted shaft screws 15 that vertically fasten the pins 27 are threaded onto both the left piston rod 2 and the right piston rod 3.

[0026] A pair of needle roller bearings 29 are installed on the shaft hole 1-2, one above the other. A sealing cover 30 is threadedly connected to the cylinder body 1 above the upper needle roller bearing 29. A retaining ring 31 for longitudinally supporting the rotating shaft 4 is installed on the cylinder body 1. A third O-ring 30a is installed on the sealing cover 30.

[0027] The cylinder block 1 has mounting holes 1-4.

[0028] Both the left sealing cover 5 and the right sealing cover 22 have end caps 32 attached to them, and the outer end face of the cylinder body 1 has a cover plate 33 attached to it.

[0029] The working principle of this invention is as follows: When the door needs to be pushed open, the cam 4-1 rotates clockwise, and the second roller 8 located in the concave limiting groove 4-1a is moved open, thereby pushing the right piston 3 open and moving it to the right, while simultaneously compressing and storing energy in the right compression spring 9. At this time, hydraulic oil flows rapidly through the first connecting hole 1d and is discharged to the shaft hole 1-2 end through the first transverse channel 1a. At the same time, the left piston 2 also moves towards the cam 4-1 by the elastic force of the left push spring 7. Since the rightward movement direction of the left piston 2 is not the sealing direction of the first sealing ball 2a, the hydraulic oil can flow smoothly from the right side of the left piston 2 through the radial notch 18-1a to the left side of the left piston 2 (e.g., Figure 17 As shown), when the door is pushed to any angle between 85° and 180°, the inlet of the third connecting hole 1k will be exposed. When the hand is released, the right pressure spring 9 will drive the right piston 3 to push the cam 4-1 to the left. However, the hydraulic oil is blocked by the second sealing ball 11 on the second one-way valve hole 1j, causing the oil circuit to be blocked. Therefore, the left piston 2 cannot be pushed by the elastic force of the right pressure spring 9 (at this time, the fourth speed regulating valve 21 is in the state of closing the passage of the sixth connecting hole 1y). Therefore, the door can stop at any angle between 85° and 180° when it is opened. Continue to push the door open by hand until the first roller 6 is stuck in the concave limiting groove 4-1a. At this time, the door is in a 180° fully open state (as shown). Figure 17 (as shown) When the door needs to be closed, pull the door back by hand. At this time, cam 4-1 rotates counterclockwise, thereby pushing the left piston rod 3 to move to the left and compressing the left pressure spring 7 to store energy. The synchronous right pressure spring 9 will then press the right piston rod 3 to move to the left (the rubber sealing gasket 20 is in the state of sealing the through hole 2-6). Due to the leftward movement of the left piston rod 3, the hydraulic oil will cause the first sealing ball 2a to seal the first one-way valve hole 2-2. Therefore, the hydraulic oil on the left side of the left piston rod 3 can only pass through the inlet end of the third connecting hole 1k. The hydraulic oil flow is disrupted because the second sealing ball 11 is pressed against the second one-way valve hole 1j by the pressure block 12 and the first compression spring 14, thus blocking the hydraulic oil passage. Furthermore, the spring force of the right compression spring 8 is insufficient to open the second sealing ball 11. Therefore, when closing the door, in the angle range between 180° and 85°, manual pushing is required to move the door so that the hydraulic oil can be manually pushed open the second sealing ball 11 (at which point the first compression spring 14 is compressed and stored energy), allowing the hydraulic oil on the left side of the left piston column 7 to flow through the second connecting hole 1h. The second transverse channel 1f and the fourth connecting hole 1m flow to the right side of the left piston column 7 (the force of the person pushing the door is adjusted by the force regulating valve block 13). Therefore, when closing the door, it can stop at any position within the angle range of 180° to 85°. When the door is closed to 85° by human force, the left piston column 7 has sealed the inlet end of the third connecting hole 1k, so hydraulic oil will not enter from here. At this time, the left piston column 7 just pushes the end face of the push rod 18-1, causing the push rod 18-1 to move to the left, thereby sealing the rubber seal. When the sealing gasket 20 opens the oil passage of the through hole 2-6, the hydraulic oil will flow from the connecting channel 18d to the radial hole 2-7 at the left end, and then through the first circular groove 2-3 to the second flow hole 1q. It will then flow from the second speed regulating valve hole 1n and the first flow hole 1p to the right side of the left piston column 7. At this time, the elastic force of the right compression spring 9 greatly exceeds the sum of the elastic forces of the left compression spring 7 and the second compression spring 19. Therefore, it can automatically push the cam 4-1 to rotate counterclockwise through the second roller 8, thus automatically closing the door (as shown). Figure 18As shown), when the door automatically closes from 85° to 15° (i.e., the door is at 15°), the insert 18 blocks the radial hole 2-7 on the left side, thus blocking the second flow hole 1q and preventing the oil passage from flowing. At the same time, the oil flows through the connecting channel 18d, through the radial channel hole 18c, to the radial hole 2-7 on the right side, and then through the second circular groove 2-4 to the fourth flow hole 1u and out through the third flow hole 1t. Thus, when the door automatically closes at an angle between 15° and 0°, the door can be controlled to close automatically at an accelerated speed (the door closing speed is adjusted by the third speed regulating valve hole 1s). This invention can stop the door at any angle between 85° and 180°, meeting customer needs and is worthy of promotion and application. When the concave limiting groove 4-1a is engaged with the second roller 8, the door is in the 0° closed state. When the concave limiting groove 4-1a is engaged with the first roller 6, the door is in the 180° open state.

[0030] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A door closer with a built-in door-stopping function, comprising a cylinder body (1), wherein the cylinder body (1) is provided with a cylinder bore (1-1) and a shaft bore (1-2) perpendicular to the cylinder bore (1-1), characterized in that: A left piston rod (2) and a right piston rod (3) are inserted into the cylinder bore (1-1). A rotating shaft (4) is rotatably connected to the cylinder body (1) and located at the shaft bore (1-2) between the left piston rod (2) and the right piston rod (3). A cam (4-1) is fixed on the rotating shaft (4). A left sealing cover (5) is threadedly closed on the left end of the cylinder bore (1-1). A first roller (6) is rotatably connected to the right end of the left piston rod (2). A first blind hole (2-1) is opened on the left piston rod (2). A first one-way hole communicating with the first blind hole (2-1) is opened on the left piston rod (2). A valve hole (2-2) is provided with a first sealing ball (2a) that mates with the first one-way valve hole (2-2). A left push spring (7) that presses the first roller (6) towards the outer contour surface of the cam (4-1) is installed between the left side of the left piston rod (2) and the right side of the left sealing cover (5). A second roller (8) is rotatably connected to the left end of the right piston rod (3). A right pressure spring (9) that presses the second roller (8) towards the outer contour surface of the cam (4-1) is installed between the right side of the right piston rod (3) and the right side of the cylinder hole (1-1). The right compression spring (9) has a first transverse channel (1a) on its side, which is opened in the cylinder (1) and communicates with the shaft hole (1-2). The cylinder (1) has a first speed regulating valve hole (1b) on its right side. A first speed regulating valve (10) is installed on the first speed regulating valve hole (1b). The cylinder (1) has a first transverse blind hole (1c) that communicates with the first speed regulating valve hole (1b). The first transverse blind hole (1c) is connected to the cylinder hole (1-1) through a first connecting hole (1d). The first speed regulating valve hole (1b) is connected to the first transverse channel (1a) through a second channel hole (1e). The left push spring (7) has a second transverse channel (1f) opened in the cylinder (1) at its side end. The second transverse channel (1f) has a second blind hole (1g) opened in the cylinder (1) at its side end. The cylinder (1) has a second one-way valve hole (1j) communicating with the second blind hole (1g). A second sealing ball (11) that mates with the second one-way valve hole (1j) is installed in the second blind hole (1g). A pressure block (12) is fitted to the side end of the second sealing ball (11). The side end of the second blind hole (1g) is threaded. A force-adjusting valve block (13) is connected, and a first compression spring (14) is installed between the force-adjusting valve block (13) and the pressure block (12). The second transverse channel (1f) and the second blind hole (1g) are connected through a second connecting hole (1h), and the second connecting hole (1h) is located inside the second sealing ball (11). The outer side of the second one-way valve hole (1j) is connected to the cylinder hole (1-1) through a third connecting hole (1k). The outer end of the second transverse channel (1f) is connected to the cylinder hole (1-1) through a fourth connecting hole (1m). The cylinder body (1) has a second speed regulating valve hole (1n) on its left side, and a second speed regulating valve (16) is installed on the second speed regulating valve hole (1n). The cylinder body (1) has a first flow hole (1p) that communicates with the second speed regulating valve hole (1n) and the shaft hole (1-2). The second speed regulating valve hole (1n) and the cylinder hole (1-1) are connected through the second flow hole (1q). The cylinder body (1) has a third speed regulating valve hole (1s) on its left side. A third speed regulating valve (17) is installed on the third speed regulating valve hole (1s). The cylinder body (1) has a third flow hole (1t) that communicates with the third speed regulating valve hole (1s) and the shaft hole (1-2). The third speed regulating valve hole (1s) and the cylinder hole (1-1) are connected by a fourth flow hole (1u). The left piston rod (2) has a first annular groove (2-3) and a second annular groove (2-4) that are respectively connected to the inlet end of the second flow hole (1q) and the inlet end of the fourth flow hole (1u). The left piston rod (2) has an insertion hole (2-5) and a through hole (2-6) with a cross-section smaller than the insertion hole (2-5) and interconnected. An insertion post (18) is inserted into the insertion hole (2-5). The end of the insertion post (18) is fixed with a push rod (18-1) that fits with the through hole (2-6) and corresponds to the position of the first blind hole (2-1). The side end of the insertion post (18) has a third blind hole (18a). The side end of the third blind hole (18a) is connected to the insertion hole (2-5). 4) A second compression spring (19) is installed between the side ends. A pair of radial holes (2-7) are opened on the left piston rod (2). The two radial holes (2-7) respectively connect the first ring groove (2-3), the second ring groove (2-4) and the insertion hole (2-5). A third ring groove (18b) is opened on the outer contour of the insertion rod (18). A radial channel hole (18c) is opened on the third ring groove (18b). A connecting channel (18d) is opened on the insertion rod (18) to connect the third blind hole (18a) and the cylinder hole (1-1). A rubber sealing gasket (20) is tightly fitted between the insertion rod (18) and the push rod (18-1). The cam (4-1) has a recessed limiting groove (4-1a) on the opposite side of the protrusion.

2. A door closer with built-in door-stopping function according to claim 1, characterized in that: The cylinder body (1) has a fourth speed regulating valve hole (1v) on its left side. A fourth speed regulating valve (21) is installed on the fourth speed regulating valve hole (1v). The side end of the fourth speed regulating valve hole (1v) is provided with a fourth blind hole (1w) that is opened in the cylinder body (1) and communicates with the fourth speed regulating valve hole (1v). The outer end of the fourth blind hole (1w) is connected to the cylinder bore (1-1) through a fifth connecting hole (1x). The fourth speed regulating valve hole (1v) is connected to the cylinder bore (1-1) through a sixth connecting hole (1y).

3. A door closer with built-in door-stopping function according to claim 1, characterized in that: The right end of the cylinder bore (1-1) is threaded with a right sealing cover (22).

4. A door closer with built-in door-stopping function according to claim 3, characterized in that: The right sealing cover (22) has a first circular hole (22-1) and a second circular hole (22-2) with a cross-section smaller than the first circular hole (22-1) at its center. A rotating block (23) is rotatably connected to the first circular hole (22-1). A limiting block (23-1) that mates with the second circular hole (22-2) is fixed to the left end of the rotating block (23). A threaded rod (23-2) is fixed to the left end of the limiting block (23-1). An adjusting plate (24) is threaded onto the threaded rod (23-2). The right end of the right pressure spring (9) presses against the adjusting plate (24). An anti-rotation guide groove (1-3) is opened on the cylinder (1). An anti-rotation protrusion (24-1) that mates with the anti-rotation guide groove (1-3) is fixed on the adjusting plate (24). A first O-ring (25) is installed on the rotating block (23).

5. A door closer with built-in door-stopping function according to claim 4, characterized in that: A slot (2-8) is provided on the left side of the insertion hole (2-5). A plug (26) is inserted into the insertion hole (2-5). A second O-ring (26a) is installed on the plug (26). A retaining spring (28) is engaged at the slot (2-8). The side end of the second compression spring (19) presses against the plug (26).

6. A door closer with built-in door-stopping function according to claim 1, characterized in that: A square column (4-2) is fixed on the top surface of the rotating shaft (4), and a countersunk threaded hole (4-3) is opened on the top surface of the square column (4-2).

7. A door closer with built-in door-stopping function according to claim 1, characterized in that: Pins (27) are inserted into both the left piston column (2) and the right piston column (3). The first roller (6) and the second roller (8) are both installed at the pins (27). A slotted shaft screw (15) is threaded onto both the left piston column (2) and the right piston column (3) to vertically fasten the pins (27).

8. A door closer with built-in door-stopping function according to claim 1, characterized in that: A pair of needle roller bearings (29) are installed on the shaft hole (1-2) and arranged on the upper and lower sides. A sealing cover (30) with a threaded connection to the cylinder body (1) is provided above the upper needle roller bearing (29). A retaining ring (31) for longitudinally supporting the rotating shaft (4) is installed on the cylinder body (1). A third O-ring (30a) is installed on the sealing cover (30).

9. A door closer with built-in door-stopping function according to claim 1, characterized in that: The cylinder body (1) has mounting holes (1-4).

10. A door closer with built-in door-stopping function according to claim 3, characterized in that: Both the left sealing cover (5) and the right sealing cover (22) are fitted with end caps (32), and the outer end face of the cylinder (1) is fitted with a cover plate (33).

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