Electric door closer

Abstract

The present invention discloses an electric door closer, including a mounting seat, a motor, and an actuator shaft. The motor is fixedly mounted on the mounting seat, a slider is slidably arranged on the mounting seat, the motor and the actuator shaft are both linked with the slider, a pull rod is fixedly connected to the slider, a spring is sleeved on the pull rod, the end of the spring close to the slider presses against the mounting seat, a washer is fixedly sleeved on the pull rod, the washer presses against the end of the spring away from the slider, and a damping circuit and a power detection switch are arranged on the motor; the power detection switch is used to detect whether the external power supply is normal, and when the external power supply is normal, the motor is switched to be connected to the external power supply, and when the external power supply is off, the motor is switched to be connected to the damping circuit. Through the above arrangement, the present invention provides an electric door closer that can automatically close the door even when the external power supply is off, and the closing speed of the electric door closer is controlled and adjusted by the damping circuit.

Description

Technical Field

[0001] The invention relates to an electric door closer. Background Art

[0002] At present, the electric door closer mainly includes a motor and an actuator shaft, the motor and the actuator shaft are linked, and the actuator shaft is connected to the door through a connecting arm, that is, when the motor is working, it drives the actuator shaft to rotate, thereby realizing the automatic opening and closing of the door. Since the motor needs an external power supply to power it, when the external power supply is cut off, the existing electric door closer cannot work, and the door can only be opened and closed manually, so there is room for improvement. Summary of the invention

[0003] In view of the deficiencies of the prior art, the present invention provides an electric door closer which can automatically close the door when the external power supply is cut off, and the closing speed of the electric door closer is controlled and adjusted by a damping circuit.

[0004] To achieve the above-mentioned object, the present invention provides an electric door closer, comprising a mounting seat, a motor, and an actuator shaft, wherein the motor is fixedly mounted on the mounting seat, a slider is slidably arranged on the mounting seat, the motor and the actuator shaft are both linked with the slider, a pull rod is fixedly connected to the slider, a spring is sleeved on the pull rod, the end of the spring close to the slider is pressed against the mounting seat, a washer is fixedly sleeved on the pull rod, the washer is pressed against the end of the spring away from the slider, and a damping circuit and a power detection switch are arranged on the motor;

[0005] The power detection switch is used to detect whether the external power supply is normal, and switch the motor to be connected to the external power supply when the external power supply is normal, and switch the motor to be connected to the damping circuit when the external power supply is off;

[0006] The damping circuit includes multiple branches with different resistance values. After the multiple branches are connected in parallel, one end is connected to the motor, and the other end is connected to the power detection switching switch through a switching switch. The switching switch is connected to a position sensor for sensing the position of the spring and triggering it to perform corresponding switching.

[0007] The beneficial effect of the present invention is that: with the above arrangement, when the external power supply is normally supplied, the motor works to drive the actuator shaft to rotate through the slider, thereby driving the door to open and close automatically through the connection of the connecting arm. When the external power supply is cut off, the motor switches to connect with the damping circuit. At this time, people open the door manually. In the process of opening the door, the slider slides and drives the pull rod to move together. The washer moves with the pull rod and compresses the spring. When closing the door, the compressed spring releases pressure and drives the slider to move back, thereby pushing the actuator shaft to rotate through the cam to achieve automatic door closing. In this process, the position sensor detects the position of the spring by induction, and selects branches with different resistance values ​​to connect with the motor according to the detected position, that is, when the door just starts to close, the resistance value of the load on the motor is small, and the door closing speed is fast; and the closer the door is to the fully closed position, the larger the resistance value of the selected load on the motor is, and the slower the door closing speed is, so that the door closing speed becomes more reasonable after being controlled and adjusted by the damping circuit, which can effectively avoid the occurrence of situations such as pinching people due to rapid door closing. In summary, the electric door closer provided by the present invention drives the motor to generate self-generation through the stored force of the spring compression when the door is opened when the external power supply is cut off, and controls the self-generated current consumed by the motor accordingly through the damping circuit, thereby realizing the use of the motor to control the rotation speed of the reduction gear set, thereby controlling and adjusting the closing speed of the door according to the different positions of the door.

[0008] The present invention can be further configured such that the execution shaft is rotatably mounted on a mounting seat, an execution gear is coaxially mounted on the execution shaft, the execution gear is transmission-connected to the motor via a reduction gear set, a cam is fixedly sleeved on the execution shaft, a sliding groove is correspondingly provided on the slider for the cam to be placed in and to form an abutment fit with the cam, the slider is fixedly mounted on a slider bracket, and the axial limit of the slider bracket is arranged on the execution shaft.

[0009] With the above structure, when the motor is working, it drives the execution gear to rotate through the reduction gear set, thereby driving the execution shaft to rotate, and the cam pushes the slider to slide, compressing the spring; or the spring releases the compression force, driving the slider to slide, thereby pushing the execution shaft to rotate through the cam and driving the motor to generate electricity. This structural setting can not only automatically open and close the door when the external power supply is normally supplied to the motor, but also drive the motor to generate electricity to achieve automatic closing when the external power supply is cut off.

[0010] The present invention can be further configured such that the pull rod includes a screw rod and a rod sleeve, one end of the screw rod is fixed to the slider, the other end of the screw rod is threadedly engaged with the rod sleeve, and the washer is fixed to the rod sleeve. This configuration allows the pull rod composed of the screw rod and the rod sleeve to have an adjustable axial length, so that it can be adjusted accordingly according to the spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1It is a schematic diagram of the principle of the present invention;

[0012] Figure 2 It is a structural diagram of the present invention;

[0013] Figure 3 It is a partial structural diagram of the present invention;

[0014] Figure 4 It is a partial structural diagram of the present invention;

[0015] Figure 5 It is a partial structural exploded view of the present invention. DETAILED DESCRIPTION

[0016] like Figure 1-5 The figure shows an electric door closer, including a mounting base 1, a motor 2, and an actuator shaft 3. The motor 2 is fixedly mounted on the mounting base 1, and a slider 4 is slidably arranged on the mounting base 1. The motor 2 and the actuator shaft 3 are both linked with the slider 4. A pull rod 5 is fixedly connected to the slider 4, and a spring 6 is sleeved on the pull rod 5. The end of the spring 6 close to the slider 4 presses against the mounting base 1. A washer 7 is fixedly sleeved on the pull rod 5, and the washer 7 presses against the end of the spring 6 away from the slider 4. A damping circuit and a power detection switch 8 are arranged on the motor 2.

[0017] The power detection switch 8 is used to detect whether the external power supply 9 is supplying power normally, and to switch the motor 2 to be connected to the external power supply 9 when the external power supply 9 is supplying power normally, and to switch the motor 2 to be connected to the damping circuit when the external power supply 9 is powered off;

[0018] Here, the main function of the power detection switching switch 8 is to select and switch the corresponding line by detecting whether the external power supply is normal. Electronic components or circuits that can achieve this function have been widely used in the prior art, so the power detection switching switch 8 will not be described in detail here.

[0019] The damping circuit includes a plurality of branches 10 with different resistance values. Specifically, resistors 14 of different sizes can be set on different branches 10. After the plurality of branches 10 are connected in parallel, one end is connected to the motor 2, and the other end is connected to the power detection switching switch 8 through the switching switch 11. The switching switch 11 is connected to a position sensor 12 for sensing the position of the spring 6 and triggering it to perform corresponding switching.

[0020] With the above arrangement, when the external power supply 9 is powered normally, the motor 2 works to drive the actuator shaft 3 to rotate through the slider 4, thereby driving the door to open and close automatically through the connection of the connecting arm 13. When the external power supply 9 is powered off, the motor 2 is switched to be connected with the damping circuit. At this time, people open the door manually. In the process of opening the door, the slider 4 slides and drives the pull rod 5 to move together. The washer 7 moves with the pull rod 5 and compresses the spring 6. When closing the door, the compressed spring 6 releases pressure and drives the slider 4 to move back, thereby pushing the actuator shaft 3 to rotate through the cam 17 to achieve automatic door closing. In this process, the position sensor 12 detects the position of the spring 6 by induction, and selects branches 10 with different resistance values ​​to connect with the motor 2 according to the detected position, that is, when the door just starts to close, the resistance value of the load on the motor 2 is small, and the door closing speed is fast; and the closer the door is to the fully closed position, the larger the resistance value of the selected load on the motor 2 is, and the slower the door closing speed is, so that the door closing speed becomes more reasonable after being controlled and adjusted by the damping circuit, which can effectively avoid the occurrence of situations such as pinching and injuring people due to rapid door closing. In summary, the electric door closer provided by the present invention drives the motor 2 to generate electricity by itself through the stored force of the spring 6 compressed when the door is opened when the external power supply 9 is powered off, and controls the self-generated current consumed by the motor 2 accordingly through the damping circuit, thereby realizing the use of the motor 2 to control the rotation speed of the reduction gear set 16, thereby controlling and adjusting the closing speed of the door according to the different positions of the door.

[0021] The present invention can be further configured such that the execution shaft 3 is rotatably mounted on the mounting seat 1, an execution gear 15 is coaxially mounted on the execution shaft 3, the execution gear 15 is transmission-connected to the motor 2 via a reduction gear set 16, a cam 17 is fixedly sleeved on the execution shaft 3, a slide groove 19 is correspondingly provided on the slider 4 for the cam 17 to be placed in and to form an abutment fit with the cam 17, the slider 4 is fixedly mounted on a slider bracket 18, and the slider bracket 18 is axially limitedly arranged on the execution shaft 3.

[0022] With the above structure, the motor 2 works, and drives the execution gear 15 to rotate through the reduction gear set 16, thereby driving the execution shaft 3 to rotate, and the cam 17 pushes the slider 4 to slide, compressing the spring 6; or the spring 6 releases the compression force, driving the slider 4 to slide, thereby pushing the execution shaft 3 to rotate through the cam 17, and driving the motor 2 to generate electricity. Such a structural setting can not only automatically open and close the door when the external power supply 9 normally supplies power to the motor 2, but also drive the motor 2 to generate electricity to achieve automatic closing when the external power supply 9 is powered off.

[0023] The present invention can be further configured such that the pull rod 5 includes a screw rod 51 and a rod sleeve 52, one end of the screw rod 51 is fixed to the slider 4, the other end of the screw rod 51 is threadedly engaged with the rod sleeve 52, and the washer 7 is fixed to the rod sleeve 52. This configuration allows the pull rod 5 composed of the screw rod 51 and the rod sleeve 52 to have an adjustable axial length, so that it can be adjusted accordingly according to the spring 6.

Claims

1. An electric door closer, comprising a mounting base, a motor, and an actuator shaft, wherein the motor is fixedly mounted on the mounting base, and characterized in that: A slider is slidably arranged on the mounting seat, and the motor and the actuator shaft are both linked with the slider. A pull rod is fixedly connected to the slider, and a spring is sleeved on the pull rod. The end of the spring close to the slider presses against the mounting seat, and a washer is fixedly sleeved on the pull rod, and the washer presses against the end of the spring away from the slider. A damping circuit and a power detection switching switch are arranged on the motor; the power detection switching switch is used to detect whether the external power supply is normally supplied, and to switch the motor to be connected to the external power supply when the external power supply is normal, and to switch the motor to be connected to the damping circuit when the external power supply is cut off; the damping circuit includes a plurality of branches with different resistance values, and one end of the plurality of branches is connected to the motor after being connected in parallel, and the other end is connected to the power detection switching switch through a switching switch, and a position sensor for sensing the position of the spring and triggering it to switch accordingly is connected to the switching switch; The execution shaft is rotatably mounted on the mounting seat, an execution gear is coaxially mounted on the execution shaft, the execution gear is transmission-connected to the motor via a reduction gear set, a cam is fixedly sleeved on the execution shaft, a slide groove is correspondingly provided on the slider for the cam to be placed in and to form an abutment fit with the cam, the slider is fixedly mounted on the slider bracket, and the slider bracket is axially limited on the execution shaft; The pull rod includes a screw and a rod sleeve, one end of the screw is fixed on the slider, the other end of the screw is threadedly matched with the rod sleeve, and the washer is fixed on the rod sleeve; when the external power supply is normally supplied, the motor works to drive the actuator shaft to rotate through the slider, thereby driving the door to open and close automatically through the connection of the connecting arm; when the external power supply is cut off, that is, when the door needs to be opened manually, the motor is switched to be connected with the damping circuit. During the process of opening the door, the slider slides and drives the pull rod to move together, and the washer moves with the pull rod while compressing the spring; when closing the door, the compressed spring releases pressure and drives the slider to move back, thereby pushing the actuator shaft to rotate through the cam to achieve automatic closing. In this process, the position sensor detects the position of the spring by induction, and selects branches with different resistance values ​​to connect to the motor according to the detected position, that is, when the door just starts to close, the resistance value of the load on the motor is small, and the closing speed is fast; and the closer the door is to the fully closed position, the larger the resistance value of the selected load on the motor is, and the slower the closing speed is.

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