CN217872363U - Spacing locking of door closer and unblock subassembly and contain its electric door closer - Google Patents

Abstract

The utility model discloses a spacing locking and unblock subassembly of door closer, it includes spacing and installs the link in spacing, spacing pothook and electro-magnet, the link middle part is rotated with spacing and is connected, the link right-hand member rotates with the one end of spacing turning block to be connected, the other end of spacing turning block rotates and is connected with spacing roller, be equipped with the elastic component between spacing turning block and the link, elastic component takes place elastic deformation when the relative link of spacing turning block takes place to rotate, still be equipped with first spring in the spacing, spacing pothook rotates to be connected in spacing, the electro-magnet passes through the push rod and is connected with spacing pothook left side, the left end bottom supports tightly with the gib head of spacing pothook right-hand member when the link rotates to the level. The door closer has the advantages that by means of the design of the elastic part, the limiting rotating block, the limiting roller and other parts, external force impact on the forced door closing can be effectively avoided, the mechanical structure of the door closer is effectively protected from being damaged, and the service life of a product is prolonged.

Description

Spacing locking of door closer and unblock subassembly and contain its electric door closer

Technical Field

The utility model belongs to the technical field of building fire safety equipment, a fire prevention door closer equipment is related to, concretely relates to spacing locking of door closer and unblock subassembly and contain its electric door closer.

Background

The fireproof door closer is mainly applied to fireproof doors in various public places or commercial occasions, and due to the fact that the passenger flow of the public places or the commercial occasions is large, the fireproof doors are frequently opened and closed, the sound of the fireproof doors colliding with the door frames cannot enter the quiet and peaceful public environment, the passing efficiency of pedestrians can be greatly reduced, meanwhile, the fireproof doors collide with the door frames at high frequency, and the service life of the fireproof door system can be shortened rapidly. According to the regulations of national standard GB50016-2014 'architectural design fire prevention Standard', normally open fire doors are preferably adopted as fire doors at places where people often pass in a building, and should be capable of being automatically closed in case of fire and have a signal feedback function. The normally-open fireproof door electric door closer mainly has two working states, namely, under a daily state, a limiting mechanism arranged in the fireproof door electric door closer takes effect to enable a fireproof door to be normally open; when fire alarm happens, the communication module of the fireproof door electric door closer receives a door closing signal of the system host, so that the limiting is invalid, the fireproof door is closed, and information is fed back to the system host after the fireproof door is closed in place.

At present, the existing normally-open fireproof door electric door closer in the market has the following problems or defects:

1. the normally-open fireproof door closer only has an electric door closing control function and cannot meet various application scenes, and most importantly, after a fire disaster happens and the door is closed urgently, the door closer is easy to be damaged, the fire is spread, and major safety accidents are easy to cause; 2. the forced door closing structure is realized by deforming a corresponding clamped metal part (not a spring) through hard extrusion, and after a fire disaster occurs and under an emergency condition, the door closer is subjected to violent external force impact, the metal part is easy to break and damage, and the door closer fails in function; 3. the number of spare and accessory parts is many, and the structure is complicated, assembles the difficulty, so the product fault rate is high, leads to the comprehensive cost to remain high.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a spacing locking of door closer and unblock subassembly and contain its electric door closer aims at overcoming the above-mentioned not enough that exists among the prior art.

The utility model provides an above-mentioned technical problem's technical scheme as follows: the utility model provides a spacing locking and unblock subassembly of door closer, its include spacing and install in link, spacing pothook and electro-magnet in the spacing, the link middle part with spacing rotates to be connected, the link right-hand member rotates with the one end of spacing turning block to be connected, the other end of spacing turning block rotates and is connected with spacing roller, spacing turning block with be equipped with the elastic component between the link, spacing turning block is relative when the link takes place to rotate the elastic component takes place elastic deformation, still be equipped with first spring in the spacing, first spring can make the link around it with the rotation junction of spacing rotates, spacing pothook rotate connect in the spacing, the electro-magnet pass through the push rod with spacing pothook left side is connected, when the link rotates to the level left end bottom with the gib head of spacing pothook right-hand member supports tightly and spacing roller stretches out and block with the draw-in groove on the door closer slider roof through the opening of spacing bottom.

On the basis of the technical scheme, the utility model discloses can also do following improvement.

Further, the elastic component is the second spring, the link right-hand member is equipped with the angle bar form extension that extends upwards right, spacing turning block middle part with the extension passes through spacing post connection, the cover is equipped with on the spacing post the second spring, the second spring is in compression state, spacing turning block is relative the link takes place to rotate the messenger spacing roller is close to during the extension, the second spring takes place elastic deformation and further grow of compression degree.

The beneficial effects of adopting above-mentioned further scheme are that, structural design is ingenious, the extension of link epitaxial formation angle bar form extension, make things convenient for the installation of second spring, realize that big exogenic action is used, itself plays the spacing roller of block in the slider draw-in groove and can transmit the pressure that external force made spacing rotor overcome the second spring and upwards rotate, make spacing roller and slider draw-in groove throw off the unblock and realize forcing to close the door, do not have the big exogenic action of forcing to close the door and use slider location locking in the draw-in groove to guarantee that spacing roller keeps to be kept in by the stronger compressive force of second spring itself, keep the normally open state of fire door under the normality.

Furthermore, the extension part and the connecting frame are integrally formed, and reinforcing ribs are arranged at the bending part of the extension part and the bending connecting part connected with the connecting frame.

Adopt above-mentioned further scheme's beneficial effect to be, integrated into one piece processing is more convenient, can guarantee the steadiness of extension structure after setting up the strengthening rib.

Further, spacing post is the step screw, the screw thread end of step screw with extension threaded connection, the cap end of step screw with the downside laminating of spacing turning block, set up the confession on the spacing turning block the waist hole that the step screw passed.

The beneficial effect who adopts above-mentioned further scheme is that, the spacing post of step screw form can be better realize being connected of spacing turning block and extension and be convenient for the cover establish the second spring, and the waist hole on step screw and the spacing turning block is the slider complex, and when spacing turning block upwards rotated, step screw itself can not rotate but relative link is static.

Further, the elastic component is a torsion spring, the torsion spring is arranged at the position where the limiting rotating block is connected with the connecting frame in a rotating mode, the torsion spring is in an elastic potential energy accumulation state, the limiting rotating block is opposite to the connecting frame, the limiting roller moves upwards due to the fact that the limiting rotating block rotates, and the torsion spring is elastically deformed to accumulate elastic potential energy and further increase the elastic potential energy.

Adopt above-mentioned further scheme's beneficial effect to be, the elastic component of torsional spring structure also can realize taking place deformation and making spacing roller deviate from the unblock from the draw-in groove of slider when strong exogenic action, and torsional spring itself has certain spacing effect, does not need the cooperation to set up extension piece and spacing post, simple structure.

Furthermore, the middle part of the connecting frame is rotationally connected with the limiting frame through a first pin shaft, the upper end of the limiting clamping hook is rotationally connected with the limiting frame through a second pin shaft, and the limiting rotating block is rotationally connected with the right end of the connecting frame through a third pin shaft.

The beneficial effect of adopting above-mentioned further scheme is that, realize the rotation between corresponding part through each round pin axle and connect, easily the installation.

Furthermore, a downward flanging which corresponds to the front and the back is arranged on the right side of the middle of the connecting frame, the second pin shaft and the third pin shaft are respectively connected with the downward flanging, the upper end of the first spring is connected with a spring positioning column on the connecting frame, the lower end of the first spring is connected with the bottom wall of the limiting frame, the spring positioning column is positioned between the second pin shaft and the third pin shaft, and when the connecting frame rotates to the horizontal position, the first spring is in a compressed state.

The adoption of the further scheme has the beneficial effects that the installation of the second pin shaft and the third pin shaft is convenient by arranging the lower flanging at the right side in the middle of the connecting frame; the first spring is installed in the position between the second pin shaft and the third pin shaft through the spring positioning column, and when the limit clamping hook removes the limit on the left end of the connecting frame, the compressed first spring can push one end of the connecting frame, provided with the limit roller, to rotate upwards and be separated from the sliding block clamping groove to achieve unlocking.

Furthermore, the upper end of the reset rod is fixedly connected with the bottom wall of the connecting frame close to the left end, and the lower end of the reset rod extends out of the open slot in the bottom wall of the limiting frame.

Adopt above-mentioned further scheme's beneficial effect is that, the release link is convenient for open the door the back that targets in place, and the manual work upwards promotes the release link and makes link left end and spacing pothook right side gib head chucking, realizes the locking, keeps preventing that fire door normally opens the state.

Furthermore, the left side of spacing pothook is equipped with down the crotch, the push rod is kept away from the one end of electro-magnet through the pintle with down the crotch is connected, the lower extreme warp of spacing pothook the open slot on the spacing diapire stretches out.

The beneficial effect who adopts above-mentioned further scheme is, makes things convenient for the dismouting, and the spacing pothook is convenient for the manual work to stir after the spacing pothook lower extreme stretches out and realizes the unblock.

The utility model also provides an electric door closer, it includes hydraulic means, connecting rod, slider, casing and the spacing locking of foretell door closer and unblock subassembly, hydraulic means pass through the connecting rod with the slider is connected, the spacing locking of door closer with unblock unit mount in the casing, be equipped with the spout on the casing, the slider is in remove in the spout, be equipped with on the slider roof with the spacing locking of door closer and unblock subassembly spacing roller complex draw-in groove.

Compared with the prior art, the utility model discloses a technological effect and advantage do:

the anti-collision device is provided with a limiting rotating block and a limiting roller, when the fireproof door needs to be forcibly closed, under the action of an external force for closing the door, the limiting roller is subjected to the action force of the clamping groove of the sliding block to enable the limiting rotating block to rotate relative to the connecting frame, so that the elastic part (a second spring or a torsional spring) is elastically deformed, and then the limiting roller is successfully released and unlocked from the clamping groove; the reset column and the limit clamping hook extend out of the bottom of the limit frame, so that manual locking reset or unlocking can be realized; the door closing modes such as electric control automatic door closing, manual driving lever door closing and forced pushing door closing can be realized, and various application scenes are met; simple structure, spare part is small in quantity, and the equipment is convenient.

Drawings

Fig. 1 is an axonometric view of a door closer limit locking and unlocking assembly provided by the present invention;

fig. 2 is a front view of the door closer limit locking and unlocking assembly shown in fig. 1;

FIG. 3 is a bottom view of the door closer spacing locking and unlocking assembly of FIG. 1;

FIG. 4 isbase:Sub>A cross-sectional view A-A of the assembly of FIG. 3;

FIG. 5 is an isometric view of components within the spacing bracket of the assembly shown in FIG. 1 mated with a door closer slide;

FIG. 6 is a front view of the structure shown in FIG. 5;

FIG. 7 is an isometric view of the slider of FIG. 5;

fig. 8 is an axonometric view of the electric door closer provided by the utility model.

In the drawings, the components represented by the respective reference numerals are listed below:

1. a limiting frame; 2. a connecting frame; 3. a limit hook; 4. an electromagnet; 5. a limiting rotation block; 6. a limiting roller; 7. a first spring; 8. a push rod; 9. a slider; 10. a card slot; 11. a second spring; 12. an extension portion; 13. a limiting column; 14. a first pin shaft; 15. a second pin shaft; 16. a third pin shaft; 17. a spring positioning post; 18. a reset lever; 19. a hydraulic device; 20. a connecting rod; 21. a housing.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

In the description of the present invention, if terms indicating orientation such as "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", etc. are used, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

As shown in fig. 1 to 8, the utility model provides a spacing locking and unblock subassembly of door closer, it includes spacing 1 and install in link 2, spacing pothook 3 and electro-magnet 4 in spacing 1, link 2 middle part with spacing 1 rotates to be connected, link 2 right-hand member rotates with spacing turning block 5's one end to be connected, spacing turning block 5's other end rotates and is connected with spacing roller 6, spacing turning block 5 with be equipped with the elastic component between link 2, spacing turning block 5 is relative when link 2 takes place to rotate the elastic component takes place elastic deformation, still be equipped with first spring 7 in spacing 1, first spring 7 can make link 2 around its with spacing 1's rotation junction rotates, spacing pothook 3 rotate connect in spacing 1, electro-magnet 4 through the push rod 8 with spacing pothook 3 left side is connected, link 2 rotate to the level the left end bottom with spacing pothook 3's right-hand member is tight just spacing pothook 6 passes through the block of opening and the roof 10 on spacing 1 and the door closer bottom support.

It should be noted that the elastic force of the elastic element is far greater than that of the first spring, when the connecting frame rotates to the horizontal position, the limiting rotating block keeps the state of extending out of the bottom opening of the limiting frame and being clamped into the clamping groove under the action of the large elastic force of the elastic element, and the large elastic force is enough to ensure that the limiting roller locks the sliding block when the fire door is in the normally open state; when need force to close fire door, violently promote fire door, the draw-in groove of slider increases thereupon to the effort of spacing roller, and the elastic component deformation when being enough to overcome the big elastic action of elastic component, spacing roller upwards rotates along with spacing turning block, deviates from the draw-in groove gradually, and spacing roller itself rotates around self the central axis, and relative draw-in groove diapire rolls promptly, and frictional action is little, and is not fragile. The utility model discloses utilize elastic component (compress spring etc. energetically) can be effectively to the external force impact of forcibly closing the door to dashing, the mechanical structure of effectual protection door closer does not receive the damage, extension product life.

In an embodiment of the present invention, the elastic member is a second spring 11, the right end of the connecting frame 2 is provided with an angle iron-shaped extending portion 12 extending upward and rightward, the middle of the limiting rotation block 5 is connected with the extending portion 12 through a limiting post 13, the limiting post 13 is sleeved with the second spring 11, the second spring 11 is in a compressed state, the limiting rotation block 5 is relative, the connecting frame 2 rotates to make the limiting roller 6 close to the extending portion 12, and the second spring 11 is elastically deformed and the degree of compression is further increased.

It should be noted that, the two ends of the second spring are respectively abutted against the angle iron-shaped extending part and the limiting rotating block, the second spring is kept in a compression state, in other words, the fireproof door is in a compression state when being normally opened, is further compressed when being forcibly closed, and is still in a certain compression state when being completely closed.

In an embodiment of the present invention, the extending portion 12 and the connecting frame 2 are integrally formed, and the extending portion 12 is provided with a reinforcing rib at the bending position of itself and the bending connection position of connecting frame 2.

It should be noted that the reinforcing ribs may be welded separately to the extension portions, or they may be formed separately by stamping.

In an embodiment of the present invention, the limiting post 13 is a step screw, the threaded end of the step screw is in threaded connection with the extending portion 12, the cap end of the step screw is attached to the lower side surface of the limiting rotation block 5, and a waist hole for the step screw to pass through is formed on the limiting rotation block 5.

It can be understood that the initial compression degree of the second spring between the limiting rotation block and the extension part can be adjusted by the screwing degree of the stepped screw into the extension part, and the deeper the screwing is, the greater the compression degree is, and the greater the elastic force is.

In an embodiment of the present invention, the elastic member is a torsion spring, the torsion spring is disposed at the rotation connection portion of the limiting rotation block 5 and the connection frame 2, the torsion spring is in an elastic potential energy accumulation state, the limiting rotation block 5 is relative to the connection frame 2, when the connection frame 2 rotates to make the limiting roller 6 move upwards, the torsion spring generates elastic deformation to accumulate the elastic potential energy for further increase.

It should be noted that, when the elastic member is a torsion spring, the limiting rotation block is spiral, which is convenient for the installation of the torsion spring and the realization of the function.

In an embodiment of the present invention, the middle portion of the connecting frame 2 is rotatably connected to the limiting frame 1 through a first pin 14, the upper end of the limiting hook 3 is rotatably connected to the limiting frame 1 through a second pin 15, and the limiting rotation block 5 is rotatably connected to the right end of the connecting frame 2 through a third pin 16.

In an embodiment of the present invention, a downward-turning edge corresponding to the front and back is provided on the right side of the middle of the connecting frame 2, the second pin 15 and the third pin 16 are respectively connected to the downward-turning edge, the upper end of the first spring 7 is connected to the spring positioning column 17 on the connecting frame 2, the lower end is connected to the bottom wall of the spacing frame 1, the spring positioning column 17 is located between the second pin 15 and the third pin 16, when the connecting frame 2 rotates to the horizontal level, the first spring 7 is in the compression state.

In an embodiment of the present invention, the elastic limiting device further comprises a release link 18, the upper end of the release link 18 is fixedly connected to the bottom wall of the connecting frame 2 near the left end, and the lower end of the release link 18 is extended from the open slot on the bottom wall of the limiting frame 1.

In an embodiment of the present invention, the left side of the limiting hook 3 is provided with a lower hook, the push rod 8 is kept away from one end of the electromagnet 4 is connected with the lower hook through a pin, and the lower end of the limiting hook 3 is extended through the open slot on the bottom wall of the limiting frame 1.

The utility model also provides an electric door closer, it includes the spacing locking of door closer and unblock subassembly on hydraulic means 19, connecting rod 20, slider 9, casing 21 reach, hydraulic means 19 pass through connecting rod 20 with slider 9 is connected, the spacing locking of door closer with unblock unit mount in the casing 21, be equipped with the spout on the casing 21, slider 9 is in remove in the spout, be equipped with on the 9 roof of slider with the spacing locking of door closer and unblock subassembly 6 complex draw-in groove 10 of spacing roller.

The basic principle of the utility model is as follows:

when the fireproof door is opened to a specified position, the sliding block slides to the position right above the limiting locking and unlocking assembly along the sliding groove opening track, one part of the limiting roller is embedded into a corresponding groove area (clamping groove) of the sliding block, and the left end and the right end of the limiting roller are limited inside the limiting rotating block by the clamping spring and are rotationally connected with the limiting rotating block through the pin shaft. A large-force compression spring (a second spring) is preassembled between the limiting rotating block and the connecting frame, and a step screw is inserted into an inner diameter hole of the large-force compression spring, so that support of the large-force compression spring is ensured to exist between the limiting rotating block and the connecting frame, and the pre-pressure of the large-force compression spring depends on the number of screwing turns (screwing-in degree) of the step screw locked on the corresponding screw hole position of the extending part of the connecting frame. After the fireproof door is opened in place, when the door needs to be kept in a door opening limiting working state, the tail end of the connecting frame is clamped by the hook of the limiting clamping hook, so that the connecting frame cannot rotate, the limiting roller is embedded into the slider groove, the slider is limited to move, and the aim of keeping the fireproof door in a normally open state is fulfilled.

When a fire hazard occurs, the remote control room sends a door closing instruction, the electromagnet assembly acts, namely the electromagnet push rod returns, a pin is penetrated at the front end of the electromagnet push rod, the pin constantly contacts with a limiting clamping hook groove position, so that the limiting clamping hook is driven to rotate, the limiting clamping hook is enabled to be unhooked from the tail end of the connecting frame, the connecting frame is pushed by the first spring to rotate, the limiting roller is enabled to be separated from the sliding block clamping groove, and the fireproof door is immediately closed under the action of the hydraulic device.

When a fire disaster does not occur and the fireproof door is forcibly closed by a user, the electromagnet assembly does not act, the limiting locking and unlocking assembly and the limiting clamping hook are always in a clamping state, the sliding block is subjected to external force along the horizontal direction of the sliding groove, and contact force generated by extrusion of the inclined surface of the groove of the sliding block and the outer circumferential surface of the limiting roller is transmitted to the limiting rotating block, so that the second spring is compressed, the limiting roller is also separated from the clamping groove of the sliding block, and the aim of forcibly closing the door is fulfilled.

When engineering technicians need to install and debug the door closer, if the fireproof door is in an opening state, the limiting hook only needs to be manually shifted along the horizontal direction of the sliding groove to rotate, so that the connecting frame is unhooked from the limiting hook, and the fireproof door is closed; if prevent when fire door is in the closed condition, need manually open and prevent fire door, only need to push away fire door leaf to the biggest angle of opening the door, manual pressing reset button can make link and spacing trip automatic block, reaches the spacing purpose of opening the door.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and variations can be made in the embodiments or in part of the technical features of the embodiments without departing from the spirit and the scope of the invention.

Claims (10)

1. A door closer limiting locking and unlocking assembly is characterized by comprising a limiting frame (1), a connecting frame (2), a limiting clamping hook (3) and an electromagnet (4) which are arranged in the limiting frame (1), the middle part of the connecting frame (2) is rotationally connected with the limiting frame (1), the right end of the connecting frame (2) is rotationally connected with one end of a limiting rotating block (5), the other end of the limiting rotating block (5) is rotatably connected with a limiting roller (6), an elastic piece is arranged between the limiting rotating block (5) and the connecting frame (2), when the limiting rotating block (5) rotates relative to the connecting frame (2), the elastic piece generates elastic deformation, a first spring (7) is also arranged in the limiting frame (1), the first spring (7) can enable the connecting frame (2) to rotate around the rotating connection part of the connecting frame and the limiting frame (1), the limiting hook (3) is rotatably connected in the limiting frame (1), the electromagnet (4) is connected with the left side of the limit hook (3) through a push rod (8), when the connecting frame (2) rotates to be horizontal, the bottom of the left end abuts against the hook head at the right end of the limiting clamping hook (3), and the limiting roller (6) extends out of the opening at the bottom of the limiting frame (1) and is clamped with the clamping groove (10) on the top wall of the sliding block (9) of the door closer.

2. The door closer limiting locking and unlocking assembly according to claim 1, wherein the elastic member is a second spring (11), an angle iron-shaped extending portion (12) extending upwards to the right is arranged at the right end of the connecting frame (2), the middle of the limiting rotating block (5) is connected with the extending portion (12) through a limiting column (13), the second spring (11) is sleeved on the limiting column (13), the second spring (11) is in a compression state, the limiting rotating block (5) rotates relative to the connecting frame (2) to enable the limiting roller (6) to be close to the extending portion (12), and the second spring (11) is elastically deformed and the compression degree is further increased.

3. The door closer limiting, locking and unlocking assembly according to claim 2, wherein the extension portion (12) and the connecting frame (2) are integrally formed, and reinforcing ribs are arranged at the bending part of the extension portion (12) and the bending connection part of the extension portion connected with the connecting frame (2).

4. The door closer limiting locking and unlocking assembly according to claim 2, wherein the limiting column (13) is a stepped screw, a threaded end of the stepped screw is in threaded connection with the extending part (12), a cap end of the stepped screw is attached to the lower side surface of the limiting rotating block (5), and a waist hole for the stepped screw to pass through is formed in the limiting rotating block (5).

5. The door closer limiting locking and unlocking assembly according to claim 1, wherein the elastic member is a torsion spring, the torsion spring is arranged at a rotational connection position of the limiting rotation block (5) and the connecting frame (2), the torsion spring is in an elastic potential energy accumulation state, and when the limiting rotation block (5) rotates relative to the connecting frame (2) to enable the limiting roller (6) to move upwards, the torsion spring is elastically deformed to accumulate elastic potential energy for further increase.

6. The door closer limiting locking and unlocking assembly according to claim 1, wherein the middle part of the connecting frame (2) is rotatably connected with the limiting frame (1) through a first pin shaft (14), the upper end of the limiting hook (3) is rotatably connected with the limiting frame (1) through a second pin shaft (15), and the limiting rotating block (5) is rotatably connected with the right end of the connecting frame (2) through a third pin shaft (16).

7. The door closer limiting locking and unlocking assembly according to claim 6, wherein a downward flanging which corresponds to the front and the back is arranged on the right side of the middle of the connecting frame (2), the second pin shaft (15) and the third pin shaft (16) are respectively connected with the downward flanging, the upper end of the first spring (7) is connected with a spring positioning column (17) on the connecting frame (2), the lower end of the first spring is connected with the bottom wall of the limiting frame (1), the spring positioning column (17) is located between the second pin shaft (15) and the third pin shaft (16), and when the connecting frame (2) rotates to be horizontal, the first spring (7) is in a compressed state.

8. The door closer limiting locking and unlocking assembly according to claim 1, further comprising a reset rod (18), wherein the upper end of the reset rod (18) is fixedly connected with the bottom wall of the connecting frame (2) close to the left end, and the lower end of the reset rod (18) extends out of an open slot on the bottom wall of the limiting frame (1).

9. The door closer limiting locking and unlocking assembly according to any one of claims 1 to 8, wherein a lower hook is arranged on the left side of the limiting hook (3), one end of the push rod (8) far away from the electromagnet (4) is connected with the lower hook through a pin, and the lower end of the limiting hook (3) extends out through an open slot on the bottom wall of the limiting frame (1).

10. An electric door closer is characterized by comprising a hydraulic device (19), a connecting rod (20), a sliding block (9), a shell (21) and the door closer limiting locking and unlocking assembly of any one of claims 1 to 9, wherein the hydraulic device (19) is connected with the sliding block (9) through the connecting rod (20), the door closer limiting locking and unlocking assembly is installed in the shell (21), a sliding groove is formed in the shell (21), the sliding block (9) moves in the sliding groove, and a clamping groove (10) matched with the limiting roller (6) of the door closer limiting locking and unlocking assembly is formed in the top wall of the sliding block (9).

Images