Safe and durable floor spring fireproof door

Abstract

The utility model relates to a safe and durable floor spring fireproof door which comprises a fireproof door frame, a fireproof door leaf and a floor spring, the floor spring is embedded and installed in the ground below a door opening of the fireproof door frame, an eccentric cantilever is installed at the bottom of the fireproof door leaf, and a cam shaft of the floor spring is sleeved in an eccentric shaft hole of the eccentric cantilever; the top of the fireproof door leaf is hinged to the fireproof door frame through a durable eccentric hinge, and a suspended anti-falling chain is further installed between the top of the fireproof door leaf and the fireproof door frame. The eccentric hinge has the advantages that the lower eccentric hinge arm applies vertical acting force to the upper eccentric hinge arm through the rotary supporting bearing, the radial acting force of the eccentric hinge arms to the pin shaft is reduced, the distance between the upper eccentric hinge arm and the lower eccentric hinge arm is limited through the rotary supporting shaft, inclination of the lower eccentric hinge arm is prevented, and abrasion of the pin shaft is reduced; the chain is suspended, the chain is prevented from naturally drooping to rub with the fireproof door leaf and the fireproof door frame, and the fireproof door leaf and the fireproof door frame are prevented from being abraded by the chain.

Description

Technical Field

[0001] The utility model relates to the field of fireproof doors, in particular to a safe and durable floor spring fireproof door. Background Art

[0002] Existing fire doors that use floor springs as their reset drive mechanism are prone to wear on the rotating shaft of the eccentric hinge that connects the top of the door leaf to the fire door frame after a period of opening and closing. This can cause the door leaf to fall away from the eccentric hinge, or even cause the rotating shaft of the eccentric hinge to break, causing the door leaf to topple. Currently, the risk of eccentric hinge wear is mainly reduced by using wear-resistant materials to manufacture eccentric hinges, and installing an anti-fall chain between the top of the fire door leaf and the fire door frame. However, there are the following problems: 1. Because the upper and lower cantilevers of the eccentric hinge are still directly transmitted to the rotating shaft, the radial force exerted by the lower cantilever of the eccentric hinge on the rotating shaft is still very large, and the rotating shaft is still susceptible to wear. 2. The existing anti-fall chain is in a naturally drooping state, and the chain will rub against the fire door leaf and fire door frame, damaging the surface of the fire door leaf and fire door frame over time. Utility Model Content

[0003] The purpose of the utility model is to overcome the above problems existing in the prior art and provide a safe and durable floor spring fireproof door.

[0004] In order to achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions:

[0005] A safe and durable floor spring fire door, comprising a fire door frame, a fire door leaf, and a floor spring. The floor spring is embedded in the ground below the door opening of the fire door frame. An eccentric cantilever is installed at the bottom of the fire door leaf, and the cam shaft of the floor spring is sleeved in the eccentric shaft hole of the eccentric cantilever. The top of the fire door leaf is hinged to the fire door frame by a durable eccentric hinge. A suspended anti-fall chain is also installed between the top of the fire door leaf and the fire door frame to provide anti-fall insurance for the fire door leaf.

[0006] Among them, the durable eccentric hinge includes an upper eccentric hinge arm, a lower eccentric hinge arm, a pin shaft, and a slewing support bearing. The lower eccentric hinge arm is installed at the top of the fire door leaf, the upper eccentric hinge arm is installed at the top of the door opening of the fire door frame, the slewing support bearing is installed between the upper eccentric hinge arm and the lower eccentric hinge arm, and the pin shaft is inserted into the eccentric shaft hole of the upper eccentric hinge arm, the slewing support bearing, and the eccentric shaft hole of the lower eccentric hinge arm from top to bottom.

[0007] Wherein, a positioning block is installed at the top end of the lower eccentric hinge arm, a circular positioning hole is opened on the positioning block, and the outer ring of the slewing support bearing is clamped in the circular positioning hole.

[0008] Wherein, the top end of the outer ring of the slewing support bearing is higher than the top end of the positioning block.

[0009] Wherein, a limiting flange is provided on the top of the pin shaft, and a round head limiting bolt is screwed on the bottom of the pin shaft.

[0010] Furthermore, a decorative cover is respectively installed on the upper eccentric hinge arm and the lower eccentric hinge arm.

[0011] Among them, the suspended anti-fall chain includes two rectangular mounting plates, a chain, two quick-connect rings, and a compression spring. One of the mounting plates is installed on the fire door leaf with screws, and the other mounting plate is installed on the fire door frame with screws. A U-shaped buckle is fixed to the front of each mounting plate, and the head of the chain is connected to the buckle through a quick-connect ring. The chain, quick-connect ring, and buckle are sleeved in the compression spring, and the two ends of the compression spring are respectively in contact with the mounting plate.

[0012] Furthermore, the compression spring is covered with a dustproof cloth tube.

[0013] The beneficial effects of the present invention are as follows: a slewing support bearing is installed between the upper eccentric hinge arm and the lower eccentric hinge arm. On the one hand, the slewing support bearing is used to make the lower eccentric hinge arm apply a vertical force to the upper eccentric hinge arm, reducing the radial force of the eccentric hinge arm on the pin shaft, thereby reducing the wear of the pin shaft. On the other hand, the slewing support shaft is used to limit the distance between the upper eccentric hinge arm and the lower eccentric hinge arm, preventing the lower eccentric hinge arm from tilting, further reducing the wear of the pin shaft, and improving the safety and durability of the floor spring fire door; the chain, quick connecting ring and buckle are put into the compression spring, and the two ends of the compression spring are respectively abutted against the mounting plate to make the chain in a suspended state, thereby preventing the chain from naturally sagging and rubbing against the fire door leaf and the fire door frame, and on the basis of using the anti-fall chain to prevent the fire door leaf from falling, the chain is prevented from wearing the fire door leaf and the fire door frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0015] Figure 1 This is a structural diagram of the floor spring fire door in the utility model;

[0016] Figure 2 This is a schematic structural diagram of the eccentric cantilever in the utility model;

[0017] Figure 3 This is a schematic structural diagram of the durable eccentric hinge in the utility model;

[0018] Figure 4 This is an exploded view of the durable eccentric hinge in the utility model;

[0019] Figure 5 This is a structural diagram of the suspended anti-fall chain in the utility model in a naturally straightened state;

[0020] Figure 6 This is an exploded view of the suspended anti-fall chain in the utility model in a naturally straightened state;

[0021] Explanation of the numbers in the figure: fire door frame 1, fire door leaf 2, floor spring 3, eccentric cantilever 4, eccentric shaft hole 41, durable eccentric hinge 5, upper eccentric hinge arm 51, lower eccentric hinge arm 52, pin 53, limiting flange 531, slewing support bearing 54, positioning block 55, circular positioning hole 551, hexagon socket screw 56, round head limiting bolt 57, decorative cover 58, suspended anti-fall chain 6, mounting plate 61, buckle 62, chain 63, quick connecting ring 64, compression spring 65, dustproof cloth tube 66. DETAILED DESCRIPTION

[0022] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0023] like Figure 1 As shown, a safe and durable floor spring fire door includes a fire door frame 1, a fire door leaf 2, and a floor spring 3. The floor spring 3 is embedded in the ground below the door opening of the fire door frame 1. An eccentric cantilever 4 is installed at the bottom of the fire door leaf 2, and the cam shaft of the floor spring 3 is sleeved in the eccentric shaft hole 41 of the eccentric cantilever 4.

[0024] The top of the fire door leaf 2 is hinged to the fire door frame 1 through a durable eccentric hinge 5. The durable eccentric hinge 5 includes an upper eccentric hinge arm 51, a lower eccentric hinge arm 52, a pin 53, and a slewing support bearing 54. The lower eccentric hinge arm 52 is installed at the top of the fire door leaf 2, the upper eccentric hinge arm 51 is installed at the top of the door opening of the fire door frame 1, the slewing support bearing 54 is installed between the upper eccentric hinge arm 51 and the lower eccentric hinge arm 52, and the pin 53 is inserted into the eccentric shaft hole of the upper eccentric hinge arm 51, the slewing support bearing 54, and the eccentric shaft hole of the lower eccentric hinge arm 52 from top to bottom.

[0025] A slewing support bearing is installed between the upper eccentric hinge arm and the lower eccentric hinge arm. On the one hand, the slewing support bearing enables the lower eccentric hinge arm to apply a vertical force to the upper eccentric hinge arm, reducing the radial force of the eccentric hinge arm on the pin shaft, thereby reducing the wear of the pin shaft. On the other hand, the slewing support shaft limits the distance between the upper eccentric hinge arm and the lower eccentric hinge arm, preventing the lower eccentric hinge arm from tilting, further reducing the wear of the pin shaft, and improving the safety and durability of the floor spring fire door.

[0026] In order to prevent the slewing support bearing 54 from moving on the lower eccentric hinge arm and to ensure that the slewing support bearing 54 is coaxial with the eccentric shaft hole on the lower eccentric hinge arm 52, a positioning block 55 is installed on the top end of the lower eccentric hinge arm 52. The positioning block 55 is connected to the lower eccentric hinge arm 52 with a hexagonal screw 56. The positioning block 55 is provided with a circular positioning hole 551. The outer ring of the slewing support bearing 54 is stuck in the circular positioning hole 551; the top end of the outer ring of the slewing support bearing 54 is higher than the top end of the positioning block 55.

[0027] In order to prevent the pin shaft 53 from bouncing up and down, a limiting flange 531 is provided on the top of the pin shaft 53 , and a round head limiting bolt 57 is screwed on the bottom of the pin shaft 53 .

[0028] In order to improve the aesthetics of the durable eccentric hinge 5 and facilitate cleaning of the surface of the durable eccentric hinge 5 , a decorative cover 58 is respectively installed on the upper eccentric hinge arm 51 and the lower eccentric hinge arm 52 .

[0029] A suspended anti-fall chain 6 is also installed between the top of the fire door leaf 2 and the fire door frame 1 to provide anti-fall insurance for the fire door leaf. The suspended anti-fall chain 6 includes two rectangular mounting plates 61, a chain 63, two quick-connect rings 64, and a compression spring 65. One mounting plate 61 is mounted on the fire door leaf 2 with screws, and the other mounting plate 61 is mounted on the fire door frame 1 with screws. A U-shaped buckle 62 is fixed to the front of each mounting plate 61, and the head of the chain 63 is connected to the buckle 62 through a quick-connect ring 64. The chain 63, quick-connect ring 64, and buckle 62 are sleeved in the compression spring 65, and the two ends of the compression spring 65 are respectively abutted against the mounting plate 61; the compression spring 65 is covered with a dustproof cloth tube 66 to prevent dust from falling into the compression spring, thereby facilitating the cleaning of the surface of the suspended anti-fall chain.

[0030] Put the chain, quick-connect ring and buckle into the compression spring, and make the two ends of the compression spring contact the mounting plate respectively, so that the chain is in a suspended state to prevent the chain from sagging naturally and rubbing against the fire door leaf and fire door frame. On the basis of using the anti-fall chain to prevent the fire door leaf from falling, avoid the chain from wearing the fire door leaf and fire door frame.

[0031] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention as claimed.

Claims

1. A safe and durable floor spring fire door, characterized by: The fireproof door frame comprises a fireproof door leaf, a fireproof door leaf, and a floor spring. The floor spring is embedded in the ground below the door opening of the fireproof door frame. An eccentric cantilever is installed at the bottom of the fireproof door leaf, and the cam shaft of the floor spring is sleeved in the eccentric shaft hole of the eccentric cantilever. The top of the fireproof door leaf is hinged to the fireproof door frame through a durable eccentric hinge. A suspended anti-fall chain is also installed between the top of the fireproof door leaf and the fireproof door frame to provide anti-fall insurance for the fireproof door leaf. The durable eccentric hinge includes an upper eccentric hinge arm, a lower eccentric hinge arm, a pin shaft, and a slewing support bearing. The lower eccentric hinge arm is installed at the top of the fire door leaf, the upper eccentric hinge arm is installed at the top of the door opening of the fire door frame, the slewing support bearing is installed between the upper eccentric hinge arm and the lower eccentric hinge arm, and the pin shaft is inserted into the eccentric shaft hole of the upper eccentric hinge arm, the slewing support bearing, and the eccentric shaft hole of the lower eccentric hinge arm from top to bottom.

2. The floor spring fire door according to claim 1, characterized in that: A positioning block is installed on the top end of the lower eccentric hinge arm. A circular positioning hole is opened on the positioning block, and the outer ring of the slewing support bearing is clamped in the circular positioning hole.

3. The floor spring fire door according to claim 2, characterized in that: The top end of the outer ring of the slewing support bearing is higher than the top end of the positioning block.

4. The floor spring fire door according to claim 1, characterized in that: A limiting flange is provided on the top of the pin shaft, and a round head limiting bolt is screwed on the bottom of the pin shaft.

5. The floor spring fire door according to claim 2, characterized in that: A decorative cover is respectively installed on the upper eccentric hinge arm and the lower eccentric hinge arm.

6. The floor spring fire door according to claim 1, characterized in that: The suspended anti-fall chain includes two rectangular mounting plates, a chain, two quick-connect rings, and a compression spring. One mounting plate is mounted on the fire door leaf with screws, and the other mounting plate is mounted on the fire door frame with screws. A U-shaped buckle is fixed to the front of each mounting plate. The head of the chain is connected to the buckle through a quick-connect ring. The chain, quick-connect ring, and buckle are sleeved in the compression spring, and the two ends of the compression spring are respectively in contact with the mounting plate.

7. The floor spring fire door according to claim 6, characterized in that: The compression spring is covered with a dustproof cloth tube.

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