CN220726119U - Three-rail falling-prevention PD door closer - Google Patents

Abstract

The utility model belongs to the technical field of door and window accessories, and provides a three-rail anti-falling PD door closer which comprises a fixed part and a sliding part, wherein the fixed part and the sliding part are matched for use; the fixed part further comprises a plugging assembly arranged on the first shell, the plugging assembly comprises a first shifting block, a first baffle, a second shifting block and a second baffle, the first shifting block is connected with the first baffle, the first shifting block is separated from the second shell to drive the first baffle to be inserted into the first pulley hole, the second shifting block is connected with the second baffle, and the second shifting block is separated from the second shell to drive the second baffle to be inserted into the second pulley hole. The three-rail anti-falling PD door closer has the characteristics of simple and compact structure, high reliability and long service life.

Description

Three-rail falling-prevention PD door closer

Technical Field

The utility model relates to the technical field of door and window accessories, in particular to a three-rail anti-falling PD door closer.

Background

Along with the continuous increase of demands of people for household life, the sliding side-hung door, also called as a PD door, can realize the sliding half-opened door and window, and can also realize the full-opened door and window after the side-hung rotation. The balcony is suitable for floor door places such as balconies, study rooms, gardens and the like, and particularly suitable for balconies with smaller outdoor spaces. The application of the three sliding vertical hinged doors enables the household sliding vertical hinged doors to have more choices, and the whole decoration style can be transparent and bright, so that the three sliding vertical hinged doors have the characteristics of modernization.

The three sliding vertical hinged doors are the same as the two sliding vertical hinged doors, and the sliding track of the sliding door comprises two parts: the sliding door and window needs to slide to the moving track by means of the fixed track when the sliding door and window needs to be fully opened, and then the sliding door and window is outwards rotated to be opened after being overlapped with the fixed door and window. Therefore, the fixed rail and the movable rail are provided with the matched pulley holes, so that the sliding door and window can be opened and pushed horizontally. When sliding door and window and fixed door and window overlap the back, when outwards rotatory opening, in order to prevent that sliding door and window from being easy from the roll-off of orbital pulley hole department, and initiate the incident, can set up the baffle in the pulley hole generally, can stretch out the baffle and block up the pulley hole when door and window flat-open, and then prevent sliding door and window from sliding out in the track, when door and window closes, the baffle is retracted to open the slide of pulley hole, fixed track and movable track intercommunication realize the push-pull.

If the Chinese patent with publication number of CN214303403U is granted, a three-rail closer is disclosed, which comprises a locking plate, wherein a first locking section and a second locking section which are used for blocking two pulley holes are arranged on the locking plate and are limited by the inner space of the closer, the connecting part for connecting the first locking section and the second locking section is relatively slim, after the service time is long, the connecting part may have fracture possibility, and the service life of the closer is influenced.

For another example, the Chinese patent with publication number of CN213807141U discloses a three-rail three-linkage closer, wherein a plug plate is arranged in one pulley hole in the closer, namely, the closer only plugs one pulley hole, and the other pulley hole is always in a communicated state, so that the problem of uneven stress possibly exists in the arrangement, and the reliability of the closer is reduced.

The technical problems to be solved by the utility model are as follows: how to improve the reliability and prolong the service life of the closer.

Disclosure of Invention

In order to overcome the defects of the prior art, the utility model aims to provide the three-rail anti-falling PD door closer which has the characteristics of simple and compact structure, high reliability and long service life.

The technical scheme adopted by the utility model is as follows: the three-rail anti-falling PD door closer comprises a fixed part and a sliding part which are matched for use, wherein the fixed part comprises a first shell, a first pulley hole and a second pulley hole are formed in the first shell, the sliding part comprises a second shell, and a third pulley hole corresponding to the first pulley hole and a fourth pulley hole corresponding to the second pulley hole are formed in the second shell;

the fixed part further comprises a plugging assembly arranged on the first shell, the plugging assembly comprises a first shifting block, a first baffle, a second shifting block and a second baffle, the first shifting block is connected with the first baffle, the first shifting block is separated from the second shell to drive the first baffle to be inserted into the first pulley hole, the second shifting block is connected with the second baffle, and the second shifting block is separated from the second shell to drive the second baffle to be inserted into the second pulley hole.

Through setting up the first dog that corresponds with first pulley hole, and the second dog that corresponds with second pulley hole, when fixed part and sliding part butt joint, first shifting block and second casing contact drive first baffle from first pulley hole interior first casing, simultaneously, second shifting block and second casing contact drive second baffle winter second pulley hole interior slide first casing interior for first pulley hole and third pulley hole intercommunication, second pulley hole and fourth pulley hole intercommunication, and then make the pulley can pass from fixed part and sliding part; when the fixed part is separated from the sliding part, the first baffle slides into the first pulley hole from the first shell, and the second baffle slides into the second pulley hole from the first shell, so that the first pulley hole is not communicated with the third pulley hole, and the second pulley hole is not communicated with the fourth pulley hole, and the two door leaves cannot slide relatively and can only be opened flatly. According to the utility model, the first baffle plate and the second baffle plate are correspondingly arranged in the first pulley hole and the second pulley hole respectively, and are mutually independent and do not interfere with each other, so that the reliability and stability of the three-rail closer structure are improved, and the service life of the closer is prolonged.

In some embodiments, the plugging assembly further comprises a first slider and a first elastic member, the first slider is slidably disposed inside the first housing, one end of the first shifting block is connected with the first slider, the other end of the first shifting block is convexly provided with the first housing, one end of the first baffle is connected with the first slider, the other end of the first baffle extends towards the side wall of the first pulley hole, one end of the first elastic member is abutted to one side, away from the first baffle, of the slider, and the other end of the first elastic member is abutted to the first housing. The first sliding block is matched with the first elastic piece, and when the first shifting block contacts with the second shell to drive the first sliding block to slide, the first elastic piece is driven to compress, so that the first baffle is driven to retract into the first shell from the first pulley hole; when the first shifting block is separated from the second shell, the first elastic piece resets to drive the first sliding block to slide, so that the first baffle plate stretches into the first pulley hole from the first shell.

In some embodiments, the plugging assembly further comprises a second slider, a transmission member and a second elastic member, wherein the second slider is slidably arranged inside the first shell, one end of the second shifting block is connected with the second slider, the other end of the second shifting block is convexly provided with the first shell, one end of the transmission member is connected with the second slider, the other end of the transmission member is in transmission connection with the second baffle, one end of the second elastic member is in butt joint with one end, away from the transmission member, of the second slider, and the other end of the second elastic member is in butt joint with the first shell.

In some embodiments, a transmission inclined plane is arranged on the second baffle plate, a transmission hook block matched with the transmission inclined plane is arranged on the transmission piece, and the transmission inclined plane is matched with the transmission hook block to drive the second baffle plate to slide into or slide out of the second pulley hole from the top of the second pulley hole. Through the cooperation of the transmission inclined plane and the transmission hook block, the horizontal reciprocating linear motion of the second sliding block can be converted into the vertical reciprocating linear motion required by the second baffle.

In some embodiments, the closure assembly further comprises a roller rotatably disposed on an outer surface of the drive dog. The friction type between the transmission inclined plane and the transmission hook block can be converted into rolling friction through the rollers, friction reduction, noise reduction and service life prolongation are facilitated.

In some embodiments, the plugging assembly further comprises a third elastic member, one end of the third elastic member is abutted against one end of the second baffle plate far away from the second pulley hole, and the other end is abutted against the first shell. Through setting up the third elastic component, can prevent that the second baffle from retracting to in the first casing in the second pulley hole voluntarily, ensure the reliability of second baffle shutoff second pulley hole.

In some embodiments, a first anti-falling block is arranged on the first shell, a first anti-falling groove opposite to the first anti-falling block is arranged on the second shell, the sliding part further comprises a safety component arranged on the second shell, the safety component comprises a floating block and a first rolling element rotationally connected with the floating element, the floating block is arranged in the second shell in a floating mode, the first rolling element is positioned in the first anti-falling groove, the rotating direction of the first rolling element is tangential to the moving direction of the first anti-falling block, and a groove corresponding to the first rolling element is formed in the first anti-falling block. The resistance of the first anti-falling block inserted into the first anti-falling groove can be reduced by matching the floating block with the first rolling element, so that abrasion is reduced, and noise is reduced; and set up the recess at first anti-falling block, when first anti-falling block and first anti-falling groove are in place after, in the recess was jacked into to first rolling element, first anti-falling block and first anti-falling groove separation had to overcome the power that the slider took place to retract, played the effect of anticreep, and the security performance is higher.

In some embodiments, the safety assembly further includes a fourth elastic member having one end abutting against an end of the slider remote from the first rolling member and the other end abutting against the second housing. The fourth elastic piece is used for providing elastic force required by floating of the floating block and the first rolling piece.

In some embodiments, the safety assembly further comprises an adjustment member threadably coupled to the second housing, the adjustment member for adjusting the amount of precompression of the fourth elastic member. The adjusting piece is used for adjusting the precompression amount of the fourth elastic piece, so that the elastic force provided by the fourth elastic piece is always in a proper state.

In some embodiments, the first shell is further provided with a second anti-falling block and a positioning block, the second shell is provided with a second anti-falling groove corresponding to the second anti-falling block, the second anti-falling groove is internally provided with a second rolling piece, and the second shell is provided with a positioning groove corresponding to the positioning block. Through set up the second rolling piece in the second anti-falling groove, can reduce the resistance that second anti-falling piece and second anti-falling groove are to inserting, and with locating piece and constant head tank cooperation then can be convenient for fixed part and sliding part during installation location use.

The beneficial effects of the utility model are as follows: according to the three-rail anti-falling PD door closer disclosed by the utility model, the first baffle plate and the second baffle plate are arranged on the fixed part and respectively correspond to the first pulley hole and the second pulley hole, the first baffle plate and the second baffle plate are mutually independent and do not interfere with each other, when the fixed part is separated from the sliding part, the first baffle plate pops out to stretch into the first pulley hole, and meanwhile, the second baffle plate pops out to stretch into the second pulley hole, so that the sliding wheel is prevented from sliding out, the safety and reliability are improved, and the service life of the closer is prolonged.

Drawings

FIG. 1 is a schematic view of a three rail anti-roll down PD door closer according to a preferred embodiment of the utility model;

FIG. 2 is a schematic structural view of a fixing portion in the three-rail anti-falling PD door closer shown in FIG. 1;

FIG. 3 is a schematic view of another view of the fixing portion shown in FIG. 2, wherein the cover plate is not shown;

FIG. 4 is a schematic structural view of a second shifting block, a second baffle, a transmission inclined plane, a second sliding block and a transmission member in the plugging assembly of the fixing portion shown in FIG. 3;

FIG. 5 is a schematic view of a second block, a second baffle, a driving bevel, a second slider, and a driving member of the plugging assembly of the fixing portion shown in FIG. 4;

FIG. 6 is a schematic view of the sliding portion of the three-rail anti-roll-down PD door closer of FIG. 1;

fig. 7 is another view structural schematic diagram of the sliding portion in the three-rail anti-falling PD door closer shown in fig. 6, wherein the bottom plate is not shown.

In the figure: 100. three-rail anti-falling PD door closer; 10. a fixing part; 11. a first housing; 111. a first anti-falling block; 112. a groove; 113. the second anti-falling block; 114. a positioning block; 12. a plugging assembly; 121. a first dial block; 122. a first baffle; 123. a first slider; 124. a first elastic member; 125. a second dial block; 126. a second baffle; 1261. a transmission inclined plane; 127. a second slider; 128. a transmission member; 1281. a transmission hook block; 1282. a roller; 129. a second elastic member; 20. a sliding part; 21. a second housing; 211. a first anti-falling groove; 212. a second anti-falling groove; 213. a positioning groove; 22. a safety component; 221. a slider; 222. a first rolling member; 223. a fourth elastic member; 224. an adjusting member; 23. a second rolling member; 24. and a third rolling member.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When the number of one element is referred to as being "plural," it may be any number of two or more. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 to 7, a three-rail anti-falling PD door closer 100 according to a preferred embodiment of the present utility model includes a fixing portion 10 and a sliding portion 20, wherein the fixing portion 10 includes a first housing 11, a first pulley hole (not shown) and a second pulley hole (not shown) are provided on the first housing 11, the sliding portion 20 includes a second housing 21, and a third pulley hole (not shown) corresponding to the first pulley hole and a fourth pulley hole (not shown) corresponding to the second pulley hole are provided on the second housing 21.

As shown in fig. 2 and 6, the first housing 11 is provided with a first anti-falling block 111, the second housing 21 is provided with a first anti-falling groove 211 opposite to the first anti-falling block 111, the sliding part 20 further comprises a safety component 22 mounted on the second housing 21, the safety component 22 comprises a floating block 221 and a first rolling element 222 rotatably connected with the floating element, the floating block 221 is floatingly arranged in the second housing 21, the first rolling element 222 is positioned in the first anti-falling groove 211, the rotation direction of the first rolling element 222 is tangential to the movement direction of the first anti-falling block 111, and the first anti-falling block 111 is provided with a groove 112 corresponding to the first rolling element 222. The first rolling member 222 is engaged with the slider 221 to reduce the resistance of the first falling prevention block 111 inserted into the first falling prevention groove 211, reduce wear and reduce noise; and set up recess 112 at first anti-falling block 111, when first anti-falling block 111 and first anti-falling groove 211 are in place to the back, first rolling member 222 jack-in recess 112, first anti-falling block 111 and first anti-falling groove 211 separation must overcome slider 221 and take place the power of retracting, plays the effect of anticreep, and the security performance is higher.

As shown in fig. 7, the safety assembly 22 further includes a fourth elastic member 223, one end of the fourth elastic member 223 abuts against one end of the slider 221 away from the first rolling member 222, and the other end abuts against the second housing 21. The fourth elastic member 223 is used for providing elastic force required for floating the slider 221 and the first rolling member 222. In order to facilitate adjusting the elastic force of the fourth elastic member 223, the safety assembly 22 further includes an adjusting member 224, the adjusting member 224 is in threaded connection with the second housing 21 and penetrates the fourth elastic member 223, and the adjusting member 224 is used for adjusting the precompression amount of the fourth elastic member 223, in this embodiment, the fourth elastic member 223 is a coil spring. By providing the adjusting member 224 for adjusting the precompression amount of the fourth elastic member 223, the elastic force provided by the fourth elastic member 223 is always in a proper state.

In this embodiment, the number of the first rolling members 222 is two, the two first rolling members 222 are respectively disposed at the top and the bottom of the first anti-falling slot 211, each first rolling member 222 corresponds to one floating member and one fourth elastic member 223, correspondingly, a groove 112 is respectively disposed at the top and the bottom of the first anti-falling block 111, and for convenience of adjustment, an adjusting member 224 is disposed on the fourth elastic member 223 at the bottom of the first anti-falling slot 211. In other embodiments, the first rolling member 222 and the slider 221 may be provided only at the bottom of the first fall preventing groove 211.

In order to facilitate the installation of the safety component 22, a bottom plate for plugging the installation cavity of the installation of the safety component 22 is arranged on the back surface of the second shell 21, and the bottom plate is detachably connected with the second shell 21 through screws.

Optionally, the first housing 11 is further provided with a second anti-falling block 113 and a positioning block 114, the second housing 21 is provided with a second anti-falling groove 212 corresponding to the second anti-falling block 113, the second anti-falling groove 212 is internally provided with a second rolling member 23, and the second housing 21 is provided with a positioning groove 213 corresponding to the positioning block 114. By arranging the second rolling member 23 in the second anti-falling groove 212, the resistance of the second anti-falling block 113 and the second anti-falling groove 212 to insertion can be reduced, and the positioning block 114 and the positioning groove 213 can be matched with each other to facilitate positioning and use when the fixing portion 10 and the sliding portion 20 are installed. In order to reduce the resistance of the first falling prevention block 111 when just inserted into the first falling prevention groove 211, a third rolling piece 24 is provided at the bottom of the opening of the first falling prevention groove 211.

Referring to fig. 1 and 2 together, in order to slide out of the pulley hole when the door and window are opened horizontally, the fixing portion 10 further includes a blocking assembly 12 mounted on the first housing 11, the blocking assembly 12 includes a first block 121, a first baffle 122, a second block 125 and a second baffle 126, the first block 121 is connected with the first baffle 122, the first block 121 is separated from the second housing 21 to drive the first baffle 122 to be inserted into the first pulley hole, the second block 125 is connected with the second baffle 126, and the second block 125 is separated from the second housing 21 to drive the second baffle 126 to be inserted into the second pulley hole. By arranging the first stop block corresponding to the first pulley hole and the second stop block corresponding to the second pulley hole, when the fixed part 10 is in butt joint with the sliding part 20, the first shifting block 121 contacts with the second shell 21 to drive the first baffle 122 to slide into the first shell 11 from the first pulley hole, meanwhile, the second shifting block 125 contacts with the second shell 21 to drive the second baffle 126 to slide into the first shell 11 from the second pulley hole, so that the first pulley hole is communicated with the third pulley hole, the second pulley hole is communicated with the fourth pulley hole, and the pulley can pass through the fixed part 10 and the sliding part 20; when the fixed part 10 is separated from the sliding part 20, the first baffle 122 slides into the first pulley hole from the first shell 11, and the second baffle 126 slides into the second pulley hole from the first shell 11, so that the first pulley hole is not communicated with the third pulley hole, the second pulley hole is not communicated with the fourth pulley hole, and the two door leaves cannot slide relatively and can only be opened flatly. According to the utility model, the first baffle plate 122 and the second baffle plate 126 are correspondingly arranged in the first pulley hole and the second pulley hole respectively, and the first baffle plate 122 and the second baffle plate 126 are mutually independent and do not interfere with each other, so that the reliability and the stability of the three-rail closer structure are improved, and the service life of the closer is prolonged.

As shown in fig. 3, the plugging assembly 12 further includes a first slider 123 and a first elastic member 124, where the first slider 123 is slidably disposed inside the first housing 11, one end of the first shifting block 121 is connected to the first slider 123, the other end of the first shifting block is protruding to the first housing 11, one end of the first baffle 122 is connected to the first slider 123, the other end extends toward the sidewall of the first pulley hole, one end of the first elastic member 124 abuts against one side of the slider away from the first baffle 122, and the other end abuts against the first housing 11. By arranging the first sliding block 123 to be matched with the first elastic piece 124, when the first shifting block 121 contacts with the second shell 21 to drive the first sliding block 123 to slide, the first elastic piece 124 is driven to compress, so that the first baffle 122 is driven to retract into the first shell 11 from the first pulley hole; when the first shifting block 121 is separated from the second housing 21, the first elastic member 124 resets to drive the first slider 123 to slide, so that the first baffle 122 extends into the first pulley hole from the first housing 11. In order to limit the deformation direction of the first elastic member 124, the plugging assembly 12 further includes a first guide post (not shown), one end of the first guide post is connected to the first housing 11, the other end extends toward the inside of the first slider 123, and the first elastic member 124 is sleeved on the outer surface of the first guide post.

Referring to fig. 2 and 3, the plugging assembly 12 further includes a second slider 127, a transmission member 128, and a second elastic member 129, where the second slider 127 is slidably disposed inside the first housing 11, one end of the second shifting block 125 is connected to the second slider 127, the other end is convexly disposed on the first housing 11, one end of the transmission member 128 is connected to the second slider 127, the other end is in transmission connection with the second baffle 126, one end of the second elastic member 129 is abutted to one end of the second slider 127 away from the transmission member 128, and the other end is abutted to the first housing 11. In order to limit the deformation direction of the second elastic member 129, the plugging assembly 12 further includes a second guide post (not shown), one end of the second guide post is connected to the first housing 11, the other end extends toward the inside of the second slider 127, and the second elastic member 129 is sleeved on the outer surface of the second guide post.

As shown in fig. 4 and 5, second baffle 126 is provided with a drive ramp 1261, drive member 128 is provided with a drive hook 1281 that mates with drive ramp 1261, and drive ramp 1261 mates with drive hook 1281 to drive second baffle 126 to slide into or out of the second pulley hole from the top of the second pulley hole. By the cooperation of the driving inclined surface 1261 and the driving hook block 1281, the horizontal reciprocating linear motion of the second slider 127 can be converted into the vertical reciprocating linear motion required by the second baffle 126. Further, the closure assembly 12 further includes a roller 1282, the roller 1282 being rotatably disposed on an outer surface of the drive dog 1281. The friction type between the transmission inclined surface 1261 and the transmission hook block 1281 can be converted into rolling friction by the roller 1282, so that friction and noise are reduced, and the service life is prolonged. The plugging assembly 12 further includes a third elastic member (not shown) having one end abutting against one end of the second baffle 126 remote from the second pulley hole and the other end abutting against the first housing 11. By providing the third elastic member, the second shutter 126 can be prevented from automatically retracting into the first housing 11 from the second pulley hole, and the reliability of blocking the second pulley hole by the second shutter 126 can be ensured. Similarly, to limit the deformation direction of the third elastic member, the plugging assembly 12 further includes a third guide post (not shown), one end of the third guide post is connected to the second housing 21, the other end extends toward the inside of the second baffle 126, and the third elastic member is sleeved on the outer surface of the third guide post.

Optionally, the first elastic member 124, the second elastic member 129 and the third elastic member are coil springs.

Preferably, in order to facilitate the installation of the plugging assembly 12, a cover plate (not shown) is provided on the back surface of the first housing 11, and the cover plate is detachably connected to the first housing 11 through screws, and is used for plugging a cavity on the first housing 11 for installing the plugging assembly 12.

According to the three-rail anti-falling PD door closer 100 disclosed by the utility model, the first baffle plate 122 and the second baffle plate 126 are arranged on the fixed part 10, the first baffle plate 122 and the second baffle plate 126 respectively correspond to the first pulley hole and the second pulley hole, the first baffle plate 122 and the second baffle plate 126 are mutually independent and do not interfere with each other, when the fixed part 10 is separated from the sliding part 20, the first baffle plate 122 pops out and stretches into the first pulley hole, and meanwhile, the second baffle plate 126 pops out and stretches into the second pulley hole, so that the sliding of a pulley is prevented, the safety and reliability are improved, and the service life of the closer is prolonged. And through setting up insurance subassembly 22 in first anti-falling groove 211, reduce the resistance of first anti-falling block 111 and first anti-falling groove 211 to the time of inserting, slow down wearing and tearing and noise reduction to through recess 112 and first rolling member 222 cooperation, prevent that first anti-falling block 111 and first anti-falling groove 211 from separating easily, improve the reliability of closer.

Finally, it should be noted that the foregoing description is only a preferred embodiment of the present utility model, and the present utility model is not limited to the foregoing embodiments, but may be modified or substituted for some of the features described in the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (10)

1. The utility model provides a three-rail anti-falling PD door closer (100), includes fixed part (10) and sliding part (20) that the cooperation was used, fixed part (10) include first casing (11), are equipped with first pulley hole and second pulley hole on first casing (11), sliding part (20) include second casing (21), be equipped with on second casing (21) with the third pulley hole that first pulley hole corresponds, and with the fourth pulley hole that second pulley hole corresponds, its characterized in that:

the fixed part (10) further comprises a plugging assembly (12) arranged on the first shell (11), the plugging assembly (12) comprises a first shifting block (121), a first baffle (122), a second shifting block (125) and a second baffle (126), the first shifting block (121) is connected with the first baffle (122), the first shifting block (121) is separated from the second shell (21) to drive the first baffle (122) to be inserted into the first pulley hole, the second shifting block (125) is connected with the second baffle (126), and the second shifting block (125) is separated from the second shell (21) to drive the second baffle (126) to be inserted into the second pulley hole.

2. The three-rail anti-falling PD door closer (100) according to claim 1, wherein the blocking assembly (12) further comprises a first slider (123) and a first elastic member (124), the first slider (123) is slidably disposed inside the first housing (11), one end of the first pulling block (121) is connected with the first slider (123), the other end of the first pulling block is protruding to form the first housing (11), one end of the first baffle (122) is connected with the first slider (123), the other end of the first baffle extends towards a side wall of the first pulley hole, one end of the first elastic member (124) is abutted to one side, away from the first baffle (122), of the slider, and the other end of the first elastic member is abutted to the first housing (11).

3. The three-rail anti-falling PD door closer (100) according to claim 1, wherein the blocking assembly (12) further comprises a second slider (127), a transmission member (128) and a second elastic member (129), the second slider (127) is slidably disposed inside the first housing (11), one end of the second shifting block (125) is connected with the second slider (127), the other end of the second shifting block is provided with the first housing (11) in a protruding manner, one end of the transmission member (128) is connected with the second slider (127), the other end of the transmission member is connected with the second baffle (126) in a transmission manner, one end of the second elastic member (129) is abutted with one end of the second slider (127) away from the transmission member (128), and the other end of the second elastic member is abutted with the first housing (11).

4. The three-rail anti-falling PD door closer (100) of claim 3, wherein the second baffle (126) is provided with a transmission bevel (1261), the transmission member (128) is provided with a transmission hook block (1281) that cooperates with the transmission bevel (1261), and the transmission bevel (1261) cooperates with the transmission hook block (1281) to drive the second baffle (126) to slide into or out of the second pulley hole from the top of the second pulley hole.

5. The three rail anti-roll down PD door closer (100) of claim 4, wherein the occlusion assembly (12) further comprises a roller (1282), the roller (1282) being rotatably disposed on an outer surface of the drive dog (1281).

6. The three-rail anti-drop PD door closer (100) of claim 4, wherein the blocking assembly (12) further comprises a third elastic member having one end abutting an end of the second baffle (126) remote from the second pulley hole and the other end abutting the first housing (11).

7. The three-rail anti-falling PD door closer (100) according to claim 1, wherein a first anti-falling block (111) is disposed on the first housing (11), a first anti-falling groove (211) opposite to the first anti-falling block (111) is disposed on the second housing (21), the sliding portion (20) further comprises a safety component (22) mounted on the second housing (21), the safety component (22) comprises a slider (221) and a first rolling member (222) rotatably connected with the slider, the slider (221) is disposed in the second housing (21) in a floating manner, the first rolling member (222) is disposed in the first anti-falling groove (211), a rotation direction of the first rolling member (222) is tangential to a movement direction of the first anti-falling block (111), and a groove (112) corresponding to the first rolling member (222) is disposed on the first anti-falling block (111).

8. The three-rail anti-drop PD door closer (100) according to claim 7, wherein the safety assembly (22) further comprises a fourth elastic member (223), one end of the fourth elastic member (223) abuts against an end of the slider (221) away from the first rolling member (222), and the other end abuts against the second housing (21).

9. The three rail fall prevention PD door closer (100) according to claim 8, wherein the safety assembly (22) further comprises an adjustment member (224), the adjustment member (224) being threadedly coupled to the second housing (21), the adjustment member (224) being configured to adjust the amount of precompression of the fourth elastic member (223).

10. The three-rail falling prevention PD door closer (100) according to claim 1, wherein a second falling prevention block (113) and a positioning block (114) are further disposed on the first housing (11), a second falling prevention groove (212) corresponding to the second falling prevention block (113) is disposed on the second housing (21), a second rolling member (23) is disposed in the second falling prevention groove (212), and a positioning groove (213) corresponding to the positioning block (114) is disposed on the second housing (21).