A power-saving electric door closer limit unit

Abstract

The present invention relates to a power-saving electric door closer limiting unit, comprising a slide slot body, an upper shell is provided on the upper cover of the slide slot body, a slider assembly is slidably provided in the slide slot, and the slider assembly is movably abutted against a rotating member pivotally connected in the slide slot; a telescopic spring is provided at the top of one end of the rotating member abutting against the slider assembly, and the two ends of the telescopic spring are correspondingly connected to the rotating member and the upper shell; the top of the other end of the rotating member abuts against a limiting piece provided in the slide slot, and the limiting piece is also provided with a first horizontal through hole in a strip shape, and a positioning shaft connected to the wall of the slide slot is provided in the first through hole; a reset spring and a disc-type electromagnet sleeved on the positioning shaft are correspondingly provided between the two sides of the limiting piece and the wall of the slide slot, and the rotating member is provided with an inclined surface inclined from top to bottom and outward at the position abutting against the limiting piece. The invention has a simple structure, is convenient to install, has low energy consumption cost, is convenient to maintain, and only requires a small magnetic force to achieve door opening positioning.

Description

Technical Field

[0001] The invention relates to a security device, in particular to a power-saving electric door closer limiting unit. Background Art

[0002] In modern buildings, fire doors need to be installed according to fire protection regulations. Fire doors installed in some passages are frequently used by people, and fire doors need to be kept open. Usually, electric door closers are installed on these fire doors, mostly in a parallel installation style. The hydraulic body is installed on the door, and the slide is installed on the upper edge of the door frame. The two are connected by a connecting rod. The slider connecting the connecting rod and the slide is limited by the limit unit in the slide to achieve the function of door opening positioning, so that the fire door is in a normally open state. At the same time, it is controlled by the linkage controller. When a fire alarm occurs, the controller links it to trigger the limit release function, and the fire door is closed under the action of the door closer's force storage mechanism. Due to the heavy weight of the fire door, the torque provided by the hydraulic body of the door closer is usually large. In order to maintain the door open state, the limit unit usually needs to provide a large limit force. When the limit force is output by an electromagnet, a large magnetic attraction is required, resulting in a large volume and power consumption of the electromagnet.

[0003] At present, there are two main limiting methods. One method is to use a mechanical limiting structure to keep the slider in position under the action of the limiting structure, and use a pull-out electromagnet to connect the switch of the limiting mechanism. In this way, the electromagnet needs to provide a large current when it is powered on. A large energy storage unit is often set in the door closer, such as a capacitor, a battery, etc. After the communication line sends a door closing command to the door closer, the capacitor supplies power to the electromagnet, and the door closer performs the door closing action. When the power supply line of the door closer is disconnected, the circuit part of the door closer cannot provide a large current to the electromagnet, and the mechanical limiting structure will always keep the door in an open state. In the event of a fire, the fire door loses its function of isolating smoke and fire. Secondly, when opening the door, the mechanical limiting structure of the door closer needs to be manually reset to position the fire door for opening. This type of door closer is more troublesome to operate and requires professionals to operate, which is not conducive to daily use.

[0004] The other method is to use a disc-type electromagnet, which always remains energized when the door is opened and positioned, and the slider is positioned by adsorbing the limit block. This method can realize automatic positioning of the door opening. When the circuit is broken, the limit effect is automatically released. It is more convenient to use, but in the monitoring state, a large current is always required to power the electromagnet, which consumes a lot of energy. Summary of the invention

[0005] In view of the existing deficiencies, the present invention provides a power-saving electric door closer limit unit.

[0006] The technical solution adopted by the present invention to solve its technical problems is: a power-saving electric door closer limit unit, comprising a slide slot body with a slide slot on the surface for installation on a door frame, an upper cover of the slide slot body is provided with an upper shell, a slider assembly is slidably provided in the slide slot, and the slider assembly movably abuts against a rotating member pivotally connected in the slide slot; a telescopic spring is provided at the top of the rotating member at one end abutting against the slider assembly, and the two ends of the telescopic spring are correspondingly connected to the rotating member and the upper shell, and the rotating member is provided with an inverted L-shaped abutting portion at the end abutting against the slider assembly; the top of the other end of the rotating member abuts against a limiting plate, and the limiting plate is sleeved on a positioning pin, and the two ends of the positioning pin are correspondingly connected to the sliding On the two groove walls of the groove, the limit plate is also provided with a first horizontal through hole in the shape of a strip parallel to the position of the positioning pin, and a positioning shaft whose two ends are correspondingly connected to the groove wall of the slide groove is provided in the first through hole; a return spring and a disc-type electromagnet sleeved on the positioning shaft are correspondingly provided between the two sides of the limit plate and the groove wall of the slide groove, and the rotating part is provided with an inclined surface inclined from top to bottom and outward at the position abutting against the limit plate; a limit block for limiting the sliding of the slider assembly is connected to the bottom of the rotating part, and the bottom of the limit block is inclined upward from one end of the adjacent slider assembly to the other end; the slide groove body is provided with a second vertical through hole in the shape of a strip through which the pivot axis passes at the position pivotally connected to the rotating part.

[0007] Preferably, a bracket with an inverted U-shaped cross-section is further provided between the slide slot body and the upper shell, the bracket covers the slide slot body, one end of the telescopic spring is connected to the bracket and the other end is connected to the rotating member, and the bracket is provided with a third vertical through hole in the shape of a strip through which a pivot shaft pivotally connected to the rotating member passes.

[0008] Preferably, the location of the locating pin and the location of the first through hole are at the same height.

[0009] Preferably, the bottom of the rotating member gradually tilts upward from one end abutting against the slider assembly to the other end.

[0010] Preferably, the end of the abutting portion is a rounded structure.

[0011] Preferably, the elastic force of the return spring on the limiting plate is smaller than the force applied to the limiting plate by the rotating member when the door is opened.

[0012] Preferably, the sum of the elastic force of the return spring and the magnetic attraction force of the electromagnet is greater than the force applied by the door opening rotating part to the limiting plate.

[0013] Preferably, a door closing feedback unit and a main control circuit board are also provided in the slide body, and the electromagnet and the door closing feedback unit are electrically connected to the main control circuit board.

[0014] The beneficial effects of the present invention are as follows: the invention reduces the requirements for the electromagnet suction force through the lever action, and only a small magnetic force is needed to achieve door opening positioning, thereby improving the reliability of the limit unit while reducing the power consumption and volume of the electromagnet, and is also conducive to assembly and maintenance, with simpler assembly and more reliable performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of the decomposed structure of an embodiment of the present invention;

[0016] Figure 2 is a schematic structural diagram of a rotating member according to an embodiment of the present invention;

[0017] Figure 3 is a schematic diagram of a limit unit in a normal state according to an embodiment of the present invention;

[0018] Figure 4 is a cross-sectional view of a limiting unit in a normal state according to an embodiment of the present invention;

[0019] Figure 5 is a schematic diagram of the structural state of the limit unit in the door opening / closing process according to an embodiment of the present invention;

[0020] Figure 6 is a cross-sectional view of the structure state of the limit unit of the embodiment of the present invention in the process of opening / closing the door;

[0021] Names and serial numbers of parts in the figure: 1- slide body 10- slide 11- second through hole 12- bracket 13- door closing feedback unit 14- main control circuit board 120- third through hole 2- upper shell 3- slider assembly 30- slider 4- rotating part 40- abutment part 41- inclined surface 5- telescopic spring 6- limiting plate 60- positioning shaft 61- first through hole 62- positioning pin 7- reset spring 8- electromagnet 9- limiting block. DETAILED DESCRIPTION

[0022] In order to more clearly illustrate the purpose, technical solutions and advantages of the embodiments of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments for a clear and complete description. Obviously, the described embodiments are partial embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present invention. In addition, the directional terms mentioned in the present invention, such as "up", "down", "front", "back", "left", "right", "inside", "outside", etc., are only referenced to the directions of the attached diagrams. The directional terms used are for better and clearer explanation and understanding of the present invention, rather than indicating or implying the orientation that the present invention must have, and therefore cannot be understood as limitations on the present invention.

[0023] Embodiments of the present invention Figures 1 to 6 As shown in, a power-saving electric door closer limit unit includes a slide groove body 1 for installation on a door frame, the surface of which is provided with a slide groove 10. The slide groove body 1 is the same as the structure on the existing electric door closer, that is, the so-called guide rail, a strip structure, installed on the door frame, and a slide groove is provided on the surface. The slide groove is used to install various components in the electric door closer, such as a door closing feedback unit 13, a main control circuit board 14, a limit unit, a slider assembly 3, etc., and the door closing feedback unit 13 and the limit unit are electrically connected to the main control circuit board 14, and the slider assembly 3 is connected to the hydraulic cylinder through corresponding connecting rods. The slide groove body 1 is covered with an upper shell 2 to enclose various components in the slide groove body 1. The upper shell 2 and the slide groove body 1 form a whole, which is convenient for installation. The slide groove 10 is provided with a slider assembly 3, the slider assembly 3 adopts any slider assembly in the existing electronic door closer, which includes a slider 30, a sliding channel for the slider, a connecting rod connected to the slider, etc. The slider assembly 3 is movably abutted against a rotating member 4 pivoted in the slide slot 10, that is, the slider 30 in the slider assembly 3 is abutted against the rotating member 4, and the rotating member 4 is pivoted in the slide slot 10 through a pivot axis like a conventional pivot connection structure, and the two ends of the pivot axis are connected to the groove wall of the slide slot 10. The slider 30 and the rotating member 4 are movably abutted and drive the rotating member 4 to rotate in the slide slot 10; the rotating member 4 is provided with a telescopic spring 5 at the top of the end abutting against the slider assembly 3, and the telescopic spring 5 adopts a strong spring with increased elastic force, that is, the telescopic spring 5 and the slider assembly 3 are on the same side of the rotating member 4, such as Figure 1 , Figures 3 to 6As shown in the left side, the telescopic spring 5 is arranged on the top of the rotating member 4, preferably just above the pivoting position of the rotating member 4 and the slide slot 10 and slightly biased to the center of the rotating member 4. When the rotating member 4 is strongly impacted by the slider assembly 3, it will rotate upward along the end of the limiting plate 6, and the telescopic spring 5 will be compressed by the pressure. When the slider assembly 3 and the rotating member 4 are out of contact, the rotating member 4 rotates and resets under the action of the telescopic spring 5, which is beneficial to protect the limiting unit of the door closer from being damaged when the door is forcibly closed. The two ends of the telescopic spring 5 correspond to the rotating member 4. The rotating member 4 is connected to the upper shell 2, and the rotating member 4 is provided with an inverted L-shaped abutment portion 40 at the end abutting against the slider assembly 3, that is, the abutment portion 40 is provided at the lower left corner of the rotating member, so that the slider 30 of the slider assembly 3 will not slip when abutting against the rotating member 4, thereby ensuring the normal operation of the limiting mechanism. At this time, in order to facilitate the abutment of the slider 30 of the slider assembly 3 on the abutment portion 40, the end of the abutment portion 40 is a rounded structure, and the slider assembly 3 will not be damaged; the rotating member 4 abuts against the limiting plate 6 at the top at the other end, and the limiting plate 6 is sleeved on a positioning pin 62. The two ends of the positioning pin 62 are correspondingly connected to the two groove walls of the slide groove 10. The limiting piece 6 is an iron piece. The limiting piece 6 is arranged on the right side of the rotating member 4 and is located at the top of the rotating member 4. It is positioned in the slide groove 10 through the positioning pin 62. In this way, the rotating member 4 abuts against the limiting piece and rotates, which will apply a force to the limiting piece 6. The limiting piece 6 is also provided with a first horizontal through hole 61 in the shape of a strip parallel to the position of the positioning pin 62, that is, the first through hole 61 is strip-shaped and is in the horizontal direction. The length in the horizontal direction is greater than the length in the vertical direction. The interior can move in the horizontal direction, preferably it is a waist-shaped hole, and the first through hole 61 is parallel to the position of the positioning pin 62, so that the limiting piece 6 is subjected to the force of the rotating member 4 without rotating, and the position of the positioning pin 62 is at the same height as the position of the first through hole 61, which ensures the smoothness of the front and rear movement of the limiting piece 6 in the slide groove 10. The first through hole 61 is provided with a positioning shaft 60 whose two ends are correspondingly connected to the groove wall of the slide groove 10, that is, the positioning shaft 60 passes through the first through hole 61 and the two ends are correspondingly connected to the groove wall of the slide groove 10;The two sides of the limit plate 6 and the groove wall of the slide groove 10 are correspondingly provided with a return spring 7 and a disc-type electromagnet 8 sleeved on the positioning shaft 60, that is, the electromagnet 8 and the return spring 7 are located at the front and rear sides of the limit plate 6, and the two ends of the return spring 7 are correspondingly connected to the limit plate 6 and the groove wall of the slide groove 10. The return spring 7 pushes the limit plate 6 toward the electromagnet 8 so that the electromagnet 8 and the limit plate 6 remain in a fitted state. When the electromagnet 8 is energized, it has an attraction effect on the limit plate 6. At this time, the limit plate 6 is non-rigidly fixed on the slide groove 10, which can avoid the problem of assembly error and component processing error causing the electromagnet 8 and the limit plate 6 to fail to fully attract and reduce the magnetic attraction force, effectively ensuring the reliability of the magnetic attraction force. The rotating part 4 is provided with an inclined surface 41 inclined from top to bottom and outward at the position abutting against the limit plate 6, and the bottom of the limit plate 6 can be set to the middle downward The convex structure, such as an arc-shaped protrusion, in actual application, the rotating member 4 rotates under the action of the slider 30 in the slider assembly 3, and the inclined surface 41 on the rotating member 4 applies an upward and lateral thrust to the limiting plate 6. The limiting plate 6 moves under the action of the lateral thrust, and the limiting plate 6 loses its limiting effect on the rotating member 4; when the slider 30 is out of contact with the rotating member 4, the rotating member 4 rotates and resets under the action of the telescopic spring 5, and the inclined surface 41 falls under the limiting plate 6 again. After the limiting plate 6 loses the action of the inclined surface 41, it fits with the surface of the electromagnet 8 again under the action of the reset spring 7. In this way, when the slider assembly 3 triggers the signal switch, the electromagnet 8 is energized to attract the limiting plate 6, and the limiting plate 6 is pressed against the upper surface of the rotating member 4, thereby limiting the rotation of the rotating member 4, so as to limit the sliding of the slider assembly 3 to realize the function of opening the door;When the door closer receives the door closing signal, the electromagnet 8 loses its power supply and loses its attraction force on the limit plate 6. The limit plate 6 moves away from the electromagnet 8 under the action of the rotating member 4 and its inclined surface 41, loses its limiting action, and the rotating member 4 loses its limiting action on the slider 30, thus achieving automatic door closing. The electromagnet 8 controls the activity of the limit plate 6, and then controls the rotation of the rotating member 4, and a lever effect is formed between them. The ratio of the magnetic attraction of the electromagnet 8 and the thrust of the slider 30 in the slider assembly 3 can be reduced through the rotating member 4 and the limit plate 6, which can effectively reduce the demand of the door closer for the attraction of the electromagnet 8. The electromagnet 8 only needs to provide a small magnetic attraction to achieve the door opening positioning of the slider 30 of the slider assembly 3, thereby reducing the power consumption and volume of the electromagnet 8. At the same time, the electromagnet 8 and the limit plate 6 are both arranged outside the activity area of ​​the rotating member 4. When the height of the slide slot 10 is constant, the torque lever ratio of the rotating member 4 can be improved, and the thrust demand of the rotating member 4 on the limit plate 6 can be reduced, thereby reducing the magnetic attraction of the electromagnet 8. The electromagnet 8 and the door closing feedback unit 13 are both electrically connected to the main control circuit board 14, and the main control circuit board 14 controls the electrical connection or disconnection of the electromagnet 8, thereby controlling the opening and closing of the door, and transmitting the corresponding information to the door closing feedback unit 13 to inform people of the state of the door. The door closing feedback unit 13 adopts the components and structures of the door closing feedback on the existing electronic door closer. ;

[0024] Further improvements, such as Figure 1 As shown in the figure, the bottom of the rotating member 4 is connected with a limit block 9 for limiting the sliding of the slider assembly 3, and the bottom of the limit block 9 is tilted upward from one end adjacent to the slider assembly 3 to the other end. The limit block 9 is fixedly connected to the rotating member 4, and while protecting the rotating member 4, the limit block 9 limits the slider 30 in the slider assembly 3 to achieve the function of door opening positioning. The limit block 9 is made of the same wear-resistant and high-temperature resistant plastic material as the slider 30 in the slider assembly 3, which is conducive to improving the service life of the electric door closer.

[0025] Further improvements, such as Figure 1 As shown in the figure, the slide groove body 1 is provided with a second vertical through hole 11 in the shape of a strip through which the pivot axis passes at the position where the slide groove body 1 is pivoted with the rotating member 4. This ensures that after the rotating member 4 is acted upon by the slider assembly 3, the pivot axis at which the rotating member 4 and the slide groove body 1 are pivoted is always located below the second through hole 11 through the force of the telescopic spring 5, thereby buffering the force and ensuring its service life. The through hole is also preferably a waist-shaped hole.

[0026] Further improvements, such as Figure 1 , Figures 3 to 6As shown in the figure, a bracket 12 with an inverted U-shaped cross-section is further provided between the slide groove body 1 and the upper shell 2, and the bracket 12 covers the slide groove body 1, one end of the telescopic spring 5 is connected to the bracket 12 and the other end is connected to the rotating member 4, and the bracket 12 is provided with a third vertical through hole 120 in the shape of a strip through which a pivot axis pivotally connected to the rotating member 4 passes. The use of the bracket 12 facilitates the installation of various components, enhances the structural strength of the product, and avoids damage to the upper shell 2 and the slide groove body 1. The bracket 12 can also be used to install it on the slide rail of the existing door closer, and at this time, the third through hole 120 is in a position corresponding to the second through hole 11.

[0027] Further improvements, such as Figures 1 to 6 As shown in the figure, the bottom of the rotating member 4 gradually tilts upward from one end abutting against the slider assembly 3 to the other end, forming an inclined structure, which ensures that when the door is forcibly closed, the slider in the slider assembly can generate an upward thrust on the rotating member.

[0028] Further improvements, such as Figures 1 to 6 As shown in , the elastic force of the return spring 7 on the limiting plate 6 is smaller than the force applied by the rotating member 4 to the limiting plate 6 when the door is opened, so that the rotating member 4 is not limited by the limiting plate 6, and the door opening action is realized.

[0029] Further improvements, such as Figures 1 to 6 As shown in the figure, the sum of the elastic force of the return spring 7 and the magnetic attraction force of the electromagnet 8 is greater than the force applied by the rotating part 4 to the limiting plate 6 when the door is opened, so that the rotating part 4 can be limited by the limiting plate 6 and remain in the original position, thereby realizing the door opening positioning.

[0030] It should be understood that those skilled in the art may make improvements or changes based on the above description, and all such improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A power-saving electric door closer limiter unit, characterized in that: It comprises a slide slot body for being installed on a door frame and having a slide slot on its surface, the slide slot body being covered with an upper shell, a slider assembly being slidably arranged in the slide slot, the slider assembly being movably abutted against a rotating member pivotally connected in the slide slot; a telescopic spring is arranged at the top of one end of the rotating member abutting against the slider assembly, the two ends of the telescopic spring are correspondingly connected to the rotating member and the upper shell, the rotating member is provided with an abutting portion in an inverted L shape at the end abutting against the slider assembly; the top of the other end of the rotating member abuts against a limiting plate, the limiting plate is sleeved on a positioning pin, the two ends of the positioning pin are correspondingly connected to the two groove walls of the slide slot, and the limiting plate is also provided with a A first through hole in the horizontal direction of the strip parallel to the position of the locating pin, a positioning shaft with two ends correspondingly connected to the wall of the slide slot is arranged in the first through hole; a return spring and a disc-type electromagnet sleeved on the positioning shaft are correspondingly arranged between the two sides of the limit plate and the wall of the slide slot, and the rotating part is provided with an inclined surface inclined from top to bottom and outward at the position abutting against the limit plate; a limit block for limiting the sliding of the slider assembly is connected to the bottom of the rotating part, and the bottom of the limit block is inclined upward from one end of the adjacent slider assembly to the other end; the slide slot body is provided with a second through hole in the vertical direction of the strip through which the pivot axis passes at the position pivotally connected to the rotating part.

2. The power-saving electric door closer limiter unit according to claim 1, characterized in that A bracket with an inverted U-shaped cross section is also provided between the slide slot body and the upper shell, and the bracket covers the slide slot body. One end of the telescopic spring is connected to the bracket and the other end is connected to the rotating member. The bracket is provided with a third vertical through hole in the shape of a strip through which a pivot shaft pivotally connected to the rotating member passes.

3. The power-saving electric door closer limiter unit according to claim 1, characterized in that : The position of the locating pin is at the same height as the position of the first through hole.

4. The power-saving electric door closer limiter unit according to claim 1, characterized in that The bottom of the rotating member gradually tilts upward from one end abutting against the slider assembly to the other end.

5. The power-saving electric door closer limiter unit according to claim 1, characterized in that : The end of the abutting portion is a rounded structure.

6. The power-saving electric door closer limiter unit according to claim 1, characterized in that :The elastic force of the return spring on the limit plate is smaller than the force applied to the limit plate by the rotating part when the door is opened.

7. The power-saving electric door closer limiter unit according to claim 1, characterized in that :The sum of the elastic force of the return spring and the magnetic attraction force of the electromagnet is greater than the force applied by the door opening rotating part to the limit plate.

8. The power-saving electric door closer limiter unit according to claim 1, characterized in that : A door closing feedback unit and a main control circuit board are also arranged in the slide body, and the electromagnet and the door closing feedback unit are electrically connected to the main control circuit board.

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