Door closer, heaven and earth hinge applying same and door

Abstract

The utility model discloses a door closer, a heaven and earth hinge with the door closer and a door. The door closer at least comprises a first installation part and a second installation part, a second mounting member; one end of the shaft-shaped assembly is fixedly arranged on the first mounting piece in a sleeving manner; the movable sleeve is movably arranged at the other end of the shaft-shaped assembly in a sleeving manner and is arranged in the second mounting piece in a sleeving manner; the damper is arranged in the second mounting piece in a sleeving manner and is matched with the movable sleeve; the first pin shaft is connected with the second mounting piece and the movable sleeve; the second pin shaft is connected with the movable sleeve and the shaft-shaped assembly; the first sliding groove is formed in the movable sleeve and is in limiting fit with the first pin shaft; the second sliding groove is formed in the movable sleeve and matched with the second pin shaft in a limiting mode. According to the door closer, a reset spring does not need to be arranged in the door closer, damping oil does not need to be injected into the cavity, normal use in the low-temperature environment can be met, the product adaptability is greatly improved, the structure is simple, and cost is low. The door closer is applied to the heaven and earth hinge and the door, and the automatic slow door closing effect can be achieved.

Description

Technical Field

[0001] The utility model relates to the field of hardware equipment, and particularly relates to a door closer, a concealed hinge and a door applying the same. Background Art

[0002] A concealed hinge is a mechanical device used to connect two solids and allow rotation between them.

[0003] The existing concealed hinges generally consist of a pair of mirror-symmetrical hinge leaves, which can only replace the traditional hinge to achieve the rotation function. Although it is a concealed installation compared with the traditional hinge and can improve the aesthetics, it cannot ensure the smoothness of the door opening and closing process.

[0004] As shown in the Chinese utility model patent with the publication number CN220687062U, it discloses a concealed hinge, including an upper rotating device and a lower rotating device. The lower rotating device includes a third mounting member, a fourth mounting member and a rotating ball. The fourth mounting member is detachably mounted on the third mounting member and is rotatably matched with the third mounting member. The rotating ball is movably mounted on the fourth mounting member and is matched with the third mounting member. The upper rotating device includes a first mounting member, a second mounting member, a rotating member and a first connecting head. One end of the rotating member is rotatably mounted on the second mounting member, and the other end is detachably mounted on the first mounting member and is limited by the first connecting head. It also discloses a door applying the same, including the above-mentioned concealed hinge, a door leaf and a door frame. The upper and lower ends of the door leaf are respectively rotatably mounted on the door frame through the upper rotating device and the lower rotating device. The lower rotating device of this concealed hinge is provided with a rotating ball, which can effectively improve the smoothness during rotation. The upper rotating device has an automatic reset function and is convenient to use.

[0005] Although the upper rotating device of the above-mentioned concealed hinge has an automatic reset function and can realize the function of automatically closing the door, when it automatically closes the door, due to the fast rebound speed of the reset torsion spring, the door leaf hits the door frame with great force when closing, which not only easily causes damage but also generates a large noise, affecting the use experience. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a door closer, a concealed hinge and a door applying the same, which can at least solve one of the above problems.

[0007] According to one aspect of the utility model, a door closer is provided, which at least includes:

[0008] A first mounting member, mounted on a fixed member;

[0009] A second mounting member, mounted on a movable member;

[0010] An axially-shaped component, with one end fixedly sleeved on the first mounting member;

[0011] A movable sleeve, movably sleeved on the other end of the shaft-shaped component and sleeved within the second mounting member;

[0012] A damper, sleeved within the second mounting member and cooperating with the movable sleeve;

[0013] A first pin shaft, connecting the second mounting member and the movable sleeve;

[0014] A second pin shaft, connecting the movable sleeve and the shaft-shaped component;

[0015] A first chute, formed on the movable sleeve and in limit cooperation with the first pin shaft;

[0016] A second chute, formed on the movable sleeve and in limit cooperation with the second pin shaft;

[0017] The second mounting member is movably sleeved on the shaft-shaped component and can limit the movable sleeve, the damper and the second pin shaft;

[0018] Both ends of the damper abut against the movable sleeve and the second mounting member respectively.

[0019] Thus, the present utility model provides a door closer with a brand-new structure, which can be applied to a floor hinge, cooperate with a top hinge or a bottom hinge with a return spring, and can realize the function of automatically closing the door slowly. The specific working principle is as follows: in the open state of the door, when the external force disappears and the door automatically closes under the action of the return spring in the top hinge or the bottom hinge, the movable parts such as the door leaf will drive the second mounting member to rotate relative to the shaft-shaped component, drive the movable sleeve to move within the second mounting member, and the movable sleeve moves along the length direction of the shaft-shaped component under the sliding cooperation of the first pin shaft and the first chute and the sliding cooperation of the second pin shaft and the second chute, thereby generating a thrust on the damper, and the damper generates a reaction thrust, thereby preventing the second mounting member from rotating too fast to the place, and thus playing a buffering role to achieve the effect of slowly closing the door; when the door is closed, due to the self-weight of the movable parts such as the door leaf and the action of the return spring, without external force, the reaction thrust of the damper cannot drive the second mounting member to rotate, that is, the door cannot be automatically opened. In addition, the door closer uses a mechanical structure for buffering, does not need to be provided with a return spring inside, nor does it need to inject damping oil into the cavity, which can not only meet the normal use in a low-temperature environment, greatly improve the adaptability of the product, but also has a simple structure and low cost.

[0020] In some embodiments, an installation groove is formed on the first mounting member, and the shaft-shaped component includes a fixed shaft and a connecting head capable of restricting the rotation of the fixed shaft in the axial direction. The connecting head is fixedly sleeved on the outer periphery of the fixed shaft and installed in the installation groove.

[0021] In some embodiments, a first connection hole adapted to the second pin shaft is formed on the fixed shaft, a second connection hole adapted to the first pin shaft is formed on the second mounting member, the first chute is a special-shaped groove extending along the axial rotation direction of the movable sleeve, and the second chute is a strip-shaped groove extending along the length direction of the movable sleeve.

[0022] In some embodiments, a groove-shaped limiting structure is provided on the connector head, and a limiting protrusion adapted to the groove-shaped limiting structure is provided in the mounting groove;

[0023] Alternatively, a groove-shaped limiting structure is provided in the mounting groove, and a limiting protrusion adapted to the groove-shaped limiting structure is provided on the connector head.

[0024] In some embodiments, the shaft-shaped assembly further includes a bearing, and the bearing is sleeved on the outer periphery of the fixed shaft and is in limiting cooperation with the mounting groove. Thus, the bearing plays a role in limiting the connector head and enhances the stability.

[0025] In some embodiments, the shaft-shaped assembly further includes a first snap ring and a second snap ring. A first limiting card slot and a second limiting card slot are formed on the fixed shaft. The first snap ring is sleeved on the outer periphery of the first limiting card slot and is located between the movable sleeve and the bearing, and the second snap ring is sleeved on the second limiting card slot and is located between the connector head and the bottom of the mounting groove. Thus, the arrangement of the first snap ring and the second snap ring can prevent the fixed shaft from undergoing displacement in the length direction.

[0026] In some embodiments, the door closer further includes a fixed sleeve, and the fixed sleeve is sleeved on the outer periphery of the second mounting member and can limit the first pin shaft.

[0027] In some embodiments, the door closer further includes a locking screw. A threaded hole communicating with the mounting groove is formed on the first mounting member, and the locking screw is detachably installed in the threaded hole. The locking screw is in threaded cooperation with the threaded hole and can abut against the connector head.

[0028] According to another aspect of the present invention, there is also provided a floor hinge, including an upper rotating device and a lower rotating device that are used in combination and are respectively installed at the upper and lower ends of the door leaf. One of the upper rotating device or the lower rotating device adopts the above-mentioned door closer.

[0029] Thus, the present invention provides a floor hinge with a brand-new structure. The floor hinge is composed of an upper rotating device and a lower rotating device. The above-mentioned door closer is applied to the upper rotating device or the lower rotating device, and can realize slow automatic closing of the door.

[0030] According to still another aspect of the present invention, there is also provided a door, including the above-mentioned floor hinge, and further including a door leaf and a door frame. The upper and lower ends of the door leaf are respectively rotatably installed on the door frame through the upper rotating device and the lower rotating device.

[0031] Accordingly, the present utility model provides a door with a brand-new structure. This door applies the above-mentioned floor hinge, and the upper rotating device has an automatic slow reset function, enabling an automatic slow door-closing action. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 FIG. 1 is a perspective structural view of the door closer according to Embodiment 1 of the present utility model;

[0033] Figure 2 FIG. Figure 1 2 is a bottom structural view of the door closer shown in FIG. 1;

[0034] Figure 3 FIG. Figure 2 3 is a sectional structural view of the door closer shown in FIG. 1 taken along the line A-A;

[0035] Figure 4 FIG. Figure 1 4 is a perspective structural view of the door closer shown in FIG. 1 with some structures omitted;

[0036] Figure 5 FIG. Figure 1 5 is an exploded structural view of the door closer shown in FIG. 1;

[0037] Figure 6 FIG. Figure 5 6 is a perspective structural view of the fixed shaft of the door closer shown in FIG. 1;

[0038] Figure 7 FIG. Figure 5 7 is a perspective structural view of the movable sleeve of the door closer shown in FIG. 1;

[0039] Figure 8 FIG. Figure 1 8 is an exploded structural view of a part of the door closer shown in FIG. 1;

[0040] Figure 9 FIG. 9 is a simplified structural view of the floor hinge according to Embodiment 2 of the present utility model;

[0041] Figure 10 FIG. 10 is a simplified structural view of the door according to Embodiment 3 of the present utility model;

[0042] Figure 11 FIG. 11 is an exploded structural view of a part of the door closer according to Embodiment 4 of the present utility model;

[0043] Figure 12 FIG. 12 is a front structural view of the door closer according to Embodiment 5 of the present utility model.

[0044] Figures 1 - 12Reference numerals in the drawings: A - floor hinge; B - door leaf; C - door frame; 100 - upper rotating device; 200 - lower rotating device; 1 - first mounting member; 2 - second mounting member; 3 - shaft-shaped assembly; 4 - movable sleeve; 5 - damper; 6 - first pin shaft; 7 - second pin shaft; 8 - locking screw; 9 - fixed sleeve; 11 - base portion; 12 - extension portion; 21 - cylindrical body; 22 - base plate; 23 - end cap; 31 - fixed shaft; 32 - connecting head; 33 - bearing; 34 - first snap ring; 35 - second snap ring; 36 - groove-shaped limiting structure; 37 - limiting protrusion; 41 - first chute; 42 - second chute; 111 - mounting groove; 112 - threaded hole; 121 - third connection hole; 210 - accommodating cavity; 211 - second connection hole; 311 - first connection hole; 312 - first limiting card slot; 313 - second limiting card slot; 314 - limiting plane; 321 - third limiting card slot; 322 - external thread. Detailed implementation manners

[0045] The present utility model will be further described in detail below with reference to the drawings and embodiments.

[0046] Embodiment 1

[0047] Figures 1 - 8 A schematic view shows a door closer according to an embodiment of the present utility model.

[0048] As Figures 1 - 8 shown, the door closer at least includes:

[0049] The first mounting member 1, which is mounted on the door frame C;

[0050] The second mounting member 2, which is mounted on the door leaf B;

[0051] The shaft-shaped assembly 3, one end of which is fixedly sleeved on the first mounting member 1;

[0052] The movable sleeve 4, which is movably sleeved on the other end of the shaft-shaped assembly 3 and is sleeved inside the second mounting member 2;

[0053] The damper 5, which is sleeved inside the second mounting member 2 and is matched with the movable sleeve 4;

[0054] The first pin shaft 6, which connects the second mounting member 2 and the movable sleeve 4;

[0055] The second pin shaft 7, which connects the movable sleeve 4 and the shaft-shaped assembly 3;

[0056] The first chute 41, which is opened on the movable sleeve 4 and is in limiting cooperation with the first pin shaft 6;

[0057] The second chute 42, which is opened on the movable sleeve 4 and is in limiting cooperation with the second pin shaft 7;

[0058] The second mounting member 2 is movably sleeved on the shaft-shaped assembly 3 and can limit the movable sleeve 4, the damper 5, and the second pin shaft 7;

[0059] Both ends of the damper 5 are respectively abutted against the movable sleeve 4 and the second mounting member 2.

[0060] Preferably, the first mounting member 1 of the present embodiment is integrally L-shaped, which includes a base portion 11 and an extension portion 12. The extension portion 12 extends vertically upward from the base portion 11 and is provided with a third connection hole 121. The fixed connection between the extension portion 12 and the door frame C is realized through the cooperation of a screw and the third connection hole 121.

[0061] An installation groove 111 is provided on the base portion 11 of the first mounting member 1. The shaft-shaped assembly 3 includes a fixed shaft 31 and a connection head 32 capable of restricting the rotation of the fixed shaft 31 in the axial direction. The connection head 32 is fixedly sleeved on the outer periphery of the fixed shaft 31 and is installed in the installation groove 111.

[0062] Preferably, the second mounting member 2 of the present embodiment is integrally L-shaped, which includes a cylindrical body 21, a base plate 22, and an end cap 23. The cylindrical body 21 extends vertically upward from the base plate 22, and the base plate 22 is provided with a fourth connection hole. The fixed connection between the base plate 22 and the door leaf B is realized through the cooperation of a screw and the fourth connection hole. A receiving cavity 210 is formed inside the cylindrical body 21, and both the movable sleeve 4 and the damper 5 are located in the receiving cavity 210. The end cap 23 is arranged at one end of the cylindrical body 21 away from the base plate 22 and is fixedly connected to the cylindrical body 21 by welding. The damper 5 is a commercially available hydraulic damping rod. One end of the damper 5 abuts against the movable sleeve 4, and the other end abuts against the end cap 23 through its own telescopic rod. A first connection hole 311 for cooperating with the second pin shaft 7 is provided on the fixed shaft 31. A second connection hole 211 for cooperating with the first pin shaft 6 is provided on the cylindrical body 21 of the second mounting member 2. The first chute 41 is a special-shaped groove extending along the axial rotation direction of the movable sleeve 4, and the second chute 42 is a strip-shaped groove extending in the length direction of the movable sleeve 4. There are 2 first chutes 41 and 2 second chutes 42, which are respectively oppositely arranged on the outer wall of the movable sleeve 4. The first pin shaft 6 passes through the two first chutes 41 and the second connection hole 211 of the cylindrical body 21, and both ends are fixed by manual or machine flattening or pressing, similar to a rivet structure. The second pin shaft 7 passes through the two second chutes 42 and the first connection hole 311 of the fixed shaft 31, and both ends abut against the inner wall of the cylindrical body 21, and are limited by the cylindrical body 21. Therefore, the length of the first pin shaft 6 is greater than the length of the second pin shaft 7.

[0063] A groove-shaped limiting structure 36 is arranged on the connection head 32, and a limiting protrusion 37 for limiting cooperation with the groove-shaped limiting structure 36 is arranged in the installation groove 111;

[0064] Alternatively, a groove-shaped limiting structure 36 is provided in the installation groove 111, and a limiting protrusion 37 that is in limiting cooperation with the groove-shaped limiting structure 36 is provided on the connecting head 32.

[0065] The cooperation between the groove-shaped limiting structure 36 and the limiting protrusion 37 can limit the connecting head 32 and prevent the connecting head 32 from rotating, which actually plays a role in preventing the fixed shaft 31 from rotating.

[0066] As Figure 8 shown, a groove-shaped limiting structure 36 is provided on the connecting head 32 in this embodiment. The groove-shaped limiting structure 36 can be a groove-shaped limiting structure 36 formed by multiple limiting teeth to form multiple limiting grooves. A limiting protrusion 37 that is in limiting cooperation with the groove-shaped limiting structure 36 is provided in the installation groove 111, and the limiting protrusion 37 is in limiting cooperation with one of the limiting grooves.

[0067] As Figures 3 - 5 shown, the shaft-shaped assembly 3 further includes a bearing 33. The bearing 33 is sleeved on the outer periphery of the fixed shaft 31 and is in limiting cooperation with the installation groove 111. Preferably, the bearing 33 in this embodiment is a flat thrust bearing 33. After being assembled, its upper end surface is flush with the upper end surface of the base portion 11. Thus, the bearing 33 plays a role in limiting the connecting head 32 and enhances stability.

[0068] The shaft-shaped assembly 3 further includes a first snap ring 34 and a second snap ring 35. A first limiting card slot 312 and a second limiting card slot 313 are formed on the fixed shaft 31. The first snap ring 34 is sleeved on the outer periphery of the first limiting card slot 312 and is located between the movable sleeve 4 and the bearing 33, and the second snap ring 35 is sleeved on the second limiting card slot 313 and is located between the connecting head 32 and the bottom of the installation groove 111. Thus, the first snap ring 34 and the second snap ring 35 can prevent the fixed shaft 31 from undergoing displacement in the length direction.

[0069] Preferably, a third limiting card slot 321 that is in limiting cooperation with the fixed shaft 31 is formed in the center of the connecting head 32, and a limiting plane 314 that is in limiting cooperation with the third limiting card slot 321 is provided at the lower end of the fixed shaft 31. Thus, the connecting head 32 and the fixed shaft 31 are relatively fixed, and only by limiting the connecting head 32 can the axial rotation of the fixed shaft 31 be effectively prevented.

[0070] Preferably, the bottom of the fixed shaft 31 can penetrate the bottom of the installation groove 111 and extend outside the base portion 11.

[0071] The door closer further includes a locking screw 8. A threaded hole 112 that communicates with the installation groove 111 is formed in the first installation member 1. The locking screw 8 is detachably installed in the threaded hole 112. The locking screw 8 is in threaded cooperation with the threaded hole 112 and can abut against the connecting head 32.

[0072] Preferably, in order to enhance the locking force, an external thread 322 may be provided on the outer wall of the connector 32.

[0073] The present utility model provides a door closer with a brand-new structure, which can be applied to the top and bottom hinges A. The first mounting member 1 is mounted on a stationary object such as a doorframe C, and the second mounting member 2 is mounted on a movable object such as a door leaf B.

[0074] The above-mentioned door closer cooperates with a top hinge or a bottom hinge with a return spring to achieve the function of automatically closing the door slowly. The specific working principle is as follows: In the open door state, when the external force disappears and the door automatically closes under the action of the return spring in the top hinge or the bottom hinge, the door leaf B will drive the second mounting member 2 to rotate relative to the shaft-shaped assembly 3, driving the movable sleeve 4 to move within the second mounting member 2. The movable sleeve 4 moves along the length direction of the shaft-shaped assembly 3 under the sliding fit of the first pin 6 and the first chute 41 and the sliding fit of the second pin 7 and the second chute 42, thereby generating a thrust on the damper 5, and the damper 5 generates a counter-thrust, which can prevent the second mounting member 2 from rotating too fast to the in-place position, thus playing a buffering role and achieving the effect of closing the door slowly; when the door is closed, due to the self-weight of the door leaf B and the action of the return spring, without external force, the door cannot be automatically opened only by the counter-thrust of the damper 5, that is, the second mounting member 2 cannot be driven to rotate.

[0075] In addition, the door closer uses a mechanical structure for buffering, without the need to set a return spring inside or inject damping oil into the cavity. It can not only meet the normal use in low-temperature environments, greatly improve the adaptability of the product, but also has a simple structure and low cost.

[0076] Embodiment 2

[0077] Figure 9 Schematically shows a top and bottom hinge according to one embodiment of the present utility model.

[0078] As Figure 9 shown, the top and bottom hinge includes an upper rotating device 100 and a lower rotating device 200 that are used in combination and are respectively installed at the upper and lower ends of the door body. The upper rotating device 100 or the lower rotating device 200 uses the above-mentioned door closer. In this embodiment, the following rotating device 200 using the above-mentioned door closer is taken as an example for illustration. The upper rotating device 100 is a prior art, and only needs to ensure that it is internally provided with a structure having a reset function such as a reset torsion spring. For the specific structure, reference can be made to the Chinese utility model patent with the publication number CN220687062U, and no further description will be given here.

[0079] Thus, the present utility model provides a top and bottom hinge with a brand-new structure, which is composed of an upper rotating device 100 and a lower rotating device 200. The upper rotating device 100 or the lower rotating device 200 applies the above-mentioned door closer and can achieve slow and automatic door closing.

[0080] Embodiment 3

[0081] Figure 10 Schematically shows a door according to one embodiment of the present invention.

[0082] As Figure 10 shown, the door includes the above-mentioned top and bottom hinge A, and also includes a door leaf B and a door frame C. The upper and lower ends of the door leaf B are respectively rotatably mounted on the door frame C through an upper rotating device 100 and a lower rotating device 200.

[0083] Thus, the present invention provides a door with a brand-new structure. The door applies the above-mentioned top and bottom hinge A. The upper rotating device 100 has an automatic slow reset function and can achieve an automatic slow closing action.

[0084] Embodiment 4

[0085] Figure 11 Schematically shows a door closer according to another embodiment of the present invention.

[0086] As Figure 11 shown, the structure of the door closer in this embodiment is basically the same as that of the door closer in Embodiment 1, except that: the structure of the connecting head 32 is different, and the shape of the corresponding mounting groove 111 is different.

[0087] As Figure 11 shown, the limiting protrusion 37 of this embodiment is provided on the connecting head 32 and is formed by the outward protrusion of the connecting head 32, while the groove-shaped limiting structure 36 is installed in the mounting groove 111 and is formed by the outward extension of the mounting groove 111.

[0088] Embodiment 5

[0089] Figure 12 Schematically shows a door closer according to still another embodiment of the present invention.

[0090] As Figure 12 shown, the structure of the door closer in this embodiment is basically the same as that of the door closer in Embodiment 1, except that: (1) the shape of the first pin shaft 6 is somewhat different; (2) it further includes a fixed sleeve 9.

[0091] See Figures 4 - 5 and Figure 12, the first pin shaft 6 of this embodiment passes through the cylindrical body 21 of the second mounting member 2 and the first sliding groove 41, and the fixing sleeve 9 is sleeved on the outer periphery of the cylindrical body 21 and can limit the two end portions of the first pin shaft 6. In this way, unlike in Embodiment 1, it is not necessary to flatten the two end portions of the installed first pin shaft 6 to form rivets. Instead, the two end portions of the first pin shaft 6 are directly limited by the fixing sleeve 9, and then the fixing sleeve 9 and the substrate 22 are fixedly connected by welding. Compared with Embodiment 1, the first pin shaft 6 can be shielded, improving the aesthetics.

[0092] The above are only some embodiments of the present invention. For those of ordinary skill in the art, without departing from the creative concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A door closer, characterized in that, Comprising: A first mounting member (1), mounted on a fixed member; A second mounting member (2), mounted on a movable member; A shaft-shaped assembly (3), with one end fixedly sleeved on the first mounting member (1); A movable sleeve (4), movably sleeved on the other end of the shaft-shaped assembly (3) and sleeved inside the second mounting member (2); A damper (5), sleeved inside the second mounting member (2) and cooperating with the movable sleeve (4); A first pin shaft (6), connecting the second mounting member (2) and the movable sleeve (4); A second pin shaft (7), connecting the movable sleeve (4) and the shaft-shaped assembly (3); A first chute (41), formed on the movable sleeve (4) and in limiting cooperation with the first pin shaft (6); A second chute (42), formed on the movable sleeve (4) and in limiting cooperation with the second pin shaft (7); The second mounting member (2) is movably sleeved on the shaft-shaped assembly (3) and can limit the movable sleeve (4), the damper (5) and the second pin shaft (7); Both ends of the damper (5) are respectively abutted against the movable sleeve (4) and the second mounting member (2).

2. The door closer according to claim 1, wherein, An installation groove (111) is formed on the first mounting member (1). The shaft-shaped assembly (3) includes a fixed shaft (31) and a connecting head (32) capable of restricting the rotation of the fixed shaft (31) in the axial direction. The connecting head (32) is fixedly sleeved on the outer periphery of the fixed shaft (31) and installed in the installation groove (111).

3. The door closer according to claim 2, wherein, A first connection hole (311) cooperating with the second pin shaft (7) is formed on the fixed shaft (31). A second connection hole (211) cooperating with the first pin shaft (6) is formed on the second mounting member (2). The first chute (41) is a special-shaped groove extending along the axial rotation direction of the movable sleeve (4), and the second chute (42) is a strip-shaped groove extending along the length direction of the movable sleeve (4).

4. The door closer according to claim 2, characterized in that, A groove-shaped limiting structure (36) is arranged on the connecting head (32), and a limiting protrusion (37) in limiting cooperation with the groove-shaped limiting structure (36) is arranged in the installation groove (111); Or, a groove-shaped limiting structure (36) is arranged in the installation groove (111), and the connecting head (32) is provided with a limiting protrusion (37) in limiting cooperation with the groove-shaped limiting structure (36).

5. The door closer according to claim 2, characterized in that, The shaft-shaped assembly (3) further includes a bearing (33), and the bearing (33) is sleeved on the outer periphery of the fixed shaft (31) and in limiting cooperation with the installation groove (111).

6. The door closer according to claim 5, characterized in that, The shaft-shaped assembly (3) further includes a first snap ring (34) and a second snap ring (35). A first limiting card slot (312) and a second limiting card slot (313) are formed on the fixed shaft (31). The first snap ring (34) is sleeved on the outer periphery of the first limiting card slot (312) and located between the movable sleeve (4) and the bearing (33), and the second snap ring (35) is sleeved on the second limiting card slot (313) and located between the connecting head (32) and the bottom of the installation groove (111).

7. The door closer according to claim 3, characterized in that, It further includes a fixed sleeve (9) which is sleeved on the outer periphery of the second mounting member (2) and can limit the first pin shaft (6).

8. The door closer according to any one of claims 2-7, characterized in that, It further includes a locking screw (8). A threaded hole (112) communicating with the mounting groove (111) is formed in the first mounting member (1). The locking screw (8) is detachably mounted in the threaded hole (112), threadedly engaged with the threaded hole (112), and can abut against the connector (32).

9. A floor hinge, characterized in that, It includes an upper rotating device (100) and a lower rotating device (200) which are used in cooperation and are respectively mounted at the upper and lower ends of the door leaf. One of the upper rotating device (100) and the lower rotating device (200) adopts a door closer according to any one of claims 1-8.

10. A door, comprising the top and bottom hinge (A) as claimed in claim 9, characterized in that, It further includes a door leaf (B) and a door frame (C). The upper and lower ends of the door leaf (B) are respectively rotatably mounted on the door frame (C) through the upper rotating device (100) and the lower rotating device (200).

Images