Electromagnetic release door closer

An electromagnetic release door closer, comprising a door closer body, a slide rail, and a rocker arm, one end of the rocker arm being articulated with the door closer body, and wherein an upper surface of the slide rail is provided with a slide groove, the interior of the slide rail is provided with a slide cavity parallel to the slide groove, a through slot which is parallel to the slide groove is arranged between the slide groove and the slide cavity;

• one end of the rocker arm which is far from the door closer body is connected with a slider for sliding in the slide groove, and the rocker arm and the slider are in rotatable and movable connection;
• an electromagnetic limiting mechanism which can slide in the slide cavity is arranged in the slide cavity, the electromagnetic limiting mechanism comprises an electromagnet and an electromagnetic attracting plate, the center of the electromagnet is provided with a guide hole running through the electromagnet, both ends of the electromagnet are provided with threaded fastening holes, and fastening bolts are connected into the threaded fastening holes;
• a limiting latch bolt is arranged in the guide hole, the limiting latch bolt is connected with the electromagnetic attracting plate through a screw, the screw is connected fixedly with the limiting latch bolt, and the screw and the electromagnetic attracting plate are connected movably with each other along the axial direction of the screw;
• a first spring is arranged between the limiting latch bolt and the electromagnetic attracting plate, a second spring is arranged between the electromagnetic attracting plate and the bottom of the slide cavity, the second spring abuts against the bottom of the slide cavity;
• wherein one side, which is close to the electromagnetic attracting plate, of the limiting latch bolt is provided with an annular containing groove, one end of the first spring is located in the annular containing groove, and the other end abuts against the electromagnetic attracting plate;
• wherein a control circuit module is arranged at one end of the slide cavity, and the control circuit module is connected with the electromagnetic limiting mechanism through a spring wire;
• and
• wherein a rocker arm shaft is arranged between the rocker arm and the slider, the rocker arm shaft is provided with an annular groove, one end of the rocker arm shaft is connected fixedly with the slider, the end with the annular groove extends into a first connecting hole of the rocker arm, and under this state, the position of the annular groove in the first connecting hole is as high as threaded holes;
• studs are connected into the threaded holes;
• under the connected state, one end, which is far from the slider, of the rocker arm shaft is not higher than the upper surface of the rocker arm, one end of each stud is located in the annular groove, and the other end is not higher than a sidewall surface of the rocker arm.