A fire door

Abstract

The present application relates to the field of fire-fighting equipment, in particular to a fire door comprising a door frame and a door panel, wherein the door panel is rotatably mounted on the inner side of the door frame via a rotating shaft, wherein there are two rotating shafts which are arranged in parallel, and the two rotating shafts are connected to the door panel via a spline, and the two side ends of the rotating shaft are respectively a first end and a second end; the fire door also comprises a limiting structure arranged on the door frame and used to clamp the first end, and a switching mechanism which drives the rotating shaft to move along its own axial direction and connect / disconnect with the limiting structure, and two rotating shafts are arranged on the door panel, namely a main shaft and a spare shaft, and the main shaft and the spare shaft are switched in case of fire, so as to avoid the main shaft from being worn out due to normal use and causing the door panel to be unable to be opened and closed, thereby ensuring that the fire door can be opened and closed normally and the fire prevention effect is achieved, and avoiding the spread of fire caused by the fire door being not closed tightly.

Description

Technical Field

[0001] The present application relates to the field of fire-fighting equipment, and in particular to a fire door. Background Art

[0002] Fire doors are doors that meet fire resistance stability, integrity, and thermal insulation requirements for a certain period of time. Fire doors are generally installed in locations such as evacuation stairwells and fire escapes. Under normal circumstances, fire doors are not opened and closed frequently, but they can be opened and closed frequently over time, causing wear and tear on the door's opening and closing structure. For example, damage to the hinge between the fire door panel and the door frame can prevent the fire door from opening and closing properly, reducing its fireproofing effectiveness and posing a safety hazard to the spread of fire. For fire doors with single door panels, the inability to open and close properly can also affect escape. Summary of the Invention

[0003] In order to solve the problem that the fire door cannot be opened and closed normally due to wear of the rotating structure of the fire door, the present application provides a fire door.

[0004] The fire door provided in this application adopts the following technical solution:

[0005] A fireproof door comprises a door frame and a door panel, wherein the door panel is rotatably installed on the inner side of the door frame through a rotating shaft, there are two rotating shafts and they are arranged in parallel, the two rotating shafts are connected to the door panel through a spline, and the two side ends of the rotating shaft are respectively a first end and a second end; the fireproof door also comprises a limiting structure arranged on the door frame and used to clamp the first end, and a switching mechanism that drives the rotating shaft to move along its own axial direction and connect / disconnect with the limiting structure; the limiting structure comprises a limiting groove opened on the door frame and used to clamp the first end, the switching mechanism comprises a push rod that pushes one of the rotating shafts to move along its own axial direction and connected to the limiting groove, a driving structure that drives the push rod to move, and a transmission mechanism connected between the two rotating shafts, the transmission mechanism is used to transmit the power of the rotating shaft pushed by the push rod to the other rotating shaft, and make the other rotating shaft move axially and disengage from the limiting groove.

[0006] By adopting the above technical solution, two parallel rotating shafts are arranged on the door panel, and a limiting mechanism is arranged on the door frame, wherein the limiting groove is used to clamp the first end of the rotating shaft to realize the connection between the door panel and the door frame; in order to enable the door panel to rotate relative to the door frame for opening and closing, the two rotating shafts will not be clamped with the limiting groove at the same time when the door panel rotates, and a switching mechanism is provided to switch the connection state of the two rotating shafts and the limiting mechanism. A driving structure is provided in the switching mechanism to drive the push rod to move and push one of the rotating shafts to move along its own axial direction and connect with the limiting groove. At this time, the other rotating shaft is disengaged from the limiting groove through the transmission mechanism between the two rotating shafts, thereby switching the rotating shaft when the door panel rotates, avoiding the door panel from being unable to open and close normally due to wear and other reasons of one of the rotating shafts, affecting the escape of personnel and the fire prevention effect. In addition, the rotating shaft and the door panel are connected by a spline, so that the rotating shaft can slide relative to the door panel and maintain connection with the door panel.

[0007] Further preferably, the transmission mechanism includes two connecting gears, two racks and a belt transmission assembly, the two racks are respectively fixedly connected to the two rotating shafts and are arranged axially along the rotating shafts, the two connecting gears respectively engage the two racks, and the belt transmission assembly is connected between the two connecting gears and makes the two connecting gears rotate in the same direction.

[0008] By adopting the above technical solution, two sets of gear rack transmissions and a set of belt transmission assemblies are set up to link the two rotating shafts, and the two connecting gears rotate in the same direction, so that when one of the rotating shafts moves and engages the limit slot, the connecting gear is driven to rotate through the rack, and the other connecting gear is rotated in the same direction through the belt transmission assembly. The other rotating shaft moves in the opposite direction under the action of the gear rack and disengages from the limit slot.

[0009] It is further preferred that the rotating shaft pushed by the push rod is the spare shaft, and the other rotating shaft is the main shaft. The transmission mechanism includes a driving gear, a driven gear, two racks, a steering gear and a group of belt transmission components. The two racks are fixedly connected to the two rotating shafts and are arranged axially along the rotating shaft. The driving gear is meshed with the rack on the spare shaft, and the driven gear is meshed with the rack on the main shaft. The driven gear is an incomplete gear, and the steering gear is meshed with the driving gear. The belt transmission assembly is connected between the steering gear and the driven gear; a pressure plate that abuts the first end is slidingly provided in the limit groove, and a reset member is connected to the pressure plate.

[0010] By adopting the above technical solution, two sets of gear rack transmissions, a set of belt transmission components and a steering gear are set between the spare shaft and the main shaft. Through the setting of the steering gear, the driving gear and the driven gear have opposite directions, so that when the spare shaft moves and is stuck in the limit groove, the transmission mechanism realizes that the main shaft and the spare shaft move in the same direction, so that they are further stuck in the limit groove, avoiding the situation where the spare shaft and the main shaft are both disengaged from the limit groove during the switching process, causing the door panel to fall off the door frame; and the driven gear is an incomplete gear, and during the switching process, the driven gear will disengage from the rack on the main shaft, and a pressure plate that abuts the first end is slidably set in the limit groove. The pressure plate is connected to the reset part, which will compress the reset part when the main shaft is further stuck in the limit groove. When the driven gear is disengaged from the rack on the main shaft, the main shaft is pushed to slide under the elastic force of the reset part, and disengage from the limit groove.

[0011] Further preferably, the driving structure is used to drive the push rod to move radially along the spare shaft, the push rod is connected to a connecting rod, the other end of the connecting rod is connected to a main rod, the main rod supports the second end of the main shaft, and the second end of the spare shaft is provided with an inclined surface on the circumference for abutting against the push rod.

[0012] By adopting the above technical solution, a main rod is provided to support the second end of the main shaft, and the limiting groove is used to clamp the first end of the main shaft to improve the stability of the main shaft during rotation; the driving structure drives the push rod to move radially along the spare shaft, and an inclined surface is provided on the second end of the spare shaft, so that the push rod moves and abuts against the inclined surface, which not only can push the spare shaft to move along its axial direction, but also can cooperate with the limiting groove to support the spare shaft, thereby improving the stability of the spare shaft during rotation; in addition, a connecting rod is connected between the main rod and the push rod, so that when the push rod moves, the main rod is driven to detach from the second end of the main shaft through the connecting rod to avoid blocking the movement of the main shaft.

[0013] It is further preferred that a clamping hole is opened at the axis center of the second end of the main shaft and the spare shaft, and the clamping hole is used to clamp the main rod and the push rod. The connecting rod includes a piston and a cylinder, the piston and the cylinder are slidingly connected, and the piston and the cylinder are fixedly connected to the main rod and the push rod respectively.

[0014] To ensure that the main rod is separated from the main shaft after the spare shaft is engaged with the limiting groove, thereby preventing the door panel from falling off the door frame.

[0015] Further preferably, the axial length of the inclined surface along the spare shaft is greater than the axial depth of the clamping hole along the spare shaft.

[0016] By adopting the above technical solution, since a reset part is provided in the limit groove, the reset part will be compressed after the spare shaft is clamped into the limit groove. When the push rod is facing the clamping hole on the spare shaft, the push rod is clamped into the clamping hole under the action of the reset part. The axial length of the inclined surface along the spare shaft is set to be greater than the axial depth of the clamping hole along the spare shaft, so that the distance the spare shaft is clamped into the limit groove is greater than the distance the reset part pushes the spare shaft, thereby avoiding the spare shaft from being disengaged from the limit groove, that is: after the push rod pushes the spare shaft to be clamped into the limit groove, the push rod continues to translate until it is facing the clamping hole. At this time, the spare shaft is reset under the action of the reset part and the push rod is clamped into the clamping hole. At this time, the spare shaft will not be disengaged from the clamping connection with the limit groove.

[0017] Further preferably, the driving structure includes a separator, an adjusting member and a driving source, the separator is fixedly connected to the push rod, the adjusting member is frustum-shaped, the separator abuts against the peripheral surface of the adjusting member, the adjusting member is connected to the output end of the driving source, and the driving source drives the adjusting member to move along its own axial direction.

[0018] By adopting the above technical solution, the adjusting member of the driving structure is in the shape of a cone, that is, its radius becomes smaller along its axial direction, and the separating member abuts against the peripheral surface of the adjusting member. The adjusting member is driven to move along its axial direction by the driving source, and the separating member is pushed to move along the radial direction of the adjusting member through the abutment action, thereby driving the push rod connected to the separating member to move.

[0019] Further preferably, the driving source includes a connecting plate, an electromagnetic spring and a control unit, the connecting plate is fixedly connected to the separating piece, the electromagnetic spring is connected between the connecting plate and the control unit, the control unit is provided with a built-in power supply, and a smoke sensor switch and a temperature sensor switch are provided on the circuit between the electromagnetic spring and the built-in power supply.

[0020] By adopting the above technical solution, a smoke sensor switch and a temperature sensor switch are set in the circuit between the built-in power supply and the electromagnetic spring. The fire situation is judged by monitoring the indoor smoke and temperature conditions. When the indoor smoke content and temperature both reach the threshold set by the sensors, the two switches are closed, the electromagnetic spring is energized by the built-in power supply, and the connecting plate is pushed to realize the movement of the separation part; setting two switches improves the fault tolerance rate. If only a temperature sensor switch is set, the temperature sensor switch will also be closed in high temperature weather, so that the circuit is open.

[0021] Further preferably, a filling material is provided in the door panel, and the filling material is a composite gelling material of magnesium hydroxide and magnesium chloride.

[0022] By adopting the above technical solution, a composite gelling material of magnesium hydroxide and magnesium chloride is used as the internal filler of the fire door, thereby improving the fireproof effect of the door panel.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. In this application, two rotating shafts are set on the door panel, namely a main shaft and a spare shaft. In the event of a fire, the main shaft and the spare shaft are switched to prevent the door panel from being unable to open and close due to wear and tear of the main shaft during normal use, ensuring that the fire door can be opened and closed normally and the fire prevention effect is achieved, and preventing the fire from spreading due to the fire door not being closed tightly;

[0025] 2. In a further configuration of the present application, a clamping hole is provided on the main shaft and the spare shaft, and the main shaft and the push rod are respectively used for clamping, so that the main shaft and the spare shaft remain stable during rotation;

[0026] 3. In a further configuration of the present application, a composite gelling material of magnesium hydroxide and magnesium chloride is filled in the door panel to improve the fire resistance of the door panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural diagram of a fire door;

[0028] Figure 2 Schematic diagram of the transmission mechanism of embodiment 1;

[0029] Figure 3 It is a three-dimensional schematic diagram of an annular rack;

[0030] Figure 4 is a schematic diagram of the transmission mechanism of embodiment 2;

[0031] Figure 5 is a schematic diagram of the transmission mechanism of embodiment three;

[0032] Figure 6 Schematic diagram of the structure of the fire door of the fourth embodiment;

[0033] Figure 7 It is a structural diagram of the regulating part and the separating part;

[0034] Figure 8 yes Figure 6 Schematic cross-sectional view of AA in the figure;

[0035] Figure 9 yes Figure 8 A magnified schematic diagram of B in the middle;

[0036] Figure 10 1 is a schematic structural diagram of a fire door according to a fifth embodiment;

[0037] Figure 11 yes Figure 10 Schematic cross-sectional view of CC;

[0038] Figure 12 This is a schematic structural diagram of the connection between the push rod and the clamping hole on the spare shaft in the sixth embodiment;

[0039] Figure 13 1 is a schematic structural diagram of a fire door according to a seventh embodiment;

[0040] Figure 14 yes Figure 13 A magnified schematic diagram of D in the middle;

[0041] Figure 15 1 is a schematic structural diagram of a fire door according to an eighth embodiment;

[0042] Figure 16 1 is a schematic structural diagram of a fire door according to a ninth embodiment;

[0043] Figure 17 It is a schematic structural diagram of the fire door of the tenth embodiment.

[0044] Explanation of reference numerals: 1. wall; 2. door frame; 3. door opening; 4. door panel; 42. rotating shaft; 421. clamping hole; 422. inclined plane; 423. main shaft; 424. spare shaft; 425. first end; 426. second end; 5. filling material; 6. screw rod structure; 7. switching mechanism; 71. connecting member; 72. cylinder; 73. piston; 75. slide rail; 76. slider; 77. support spring; 781. separation member; 7 82. Adjusting part; 783. Guide groove; 784. Connecting plate; 785. Electromagnetic spring; 786. Control unit; 787. Ventilation duct; 788. Arc surface; 791. Main rod; 792. Push rod; 8. Transmission mechanism; 82. Belt transmission assembly; 83. Rack; 84. Driving gear; 85. Adjusting gear; 86. Driven gear; 9. Limiting structure; 91. Limiting groove; 92. Resetting part; 93. Pressing plate; 10. Hinge. DETAILED DESCRIPTION

[0045] The following is combined with Figure 1 -Attached Figure 14 This application is described in further detail.

[0046] The embodiment of the present application discloses a fire door, as shown in the attached Figure 1 As shown, the door panel 4 includes a door frame 2, a door panel 4, a limiting structure 9, and a switching mechanism 7. The door panel 4 is rotatably mounted on the inner side of the door frame 2 via a rotating shaft 42. Two rotating shafts 42 are provided and are arranged in parallel. During normal use, the door panel 4 rotates around one of the rotating shafts 42 to open and close. When a fire occurs, the door panel 4 rotates around the other rotating shaft 42 to open and close. This avoids the hidden danger of the door panel 4 being unable to open and close normally in the event of a fire due to wear of the rotating shaft 42 during normal use, thereby reducing the fireproof effect of the door panel 4 and even affecting the escape of personnel. In addition, the filling material 5 in the door panel 4 is a composite gelling material of magnesium hydroxide and magnesium chloride.

[0047] Specifically, the limiting structure 9 includes a limiting groove 91 provided on the door frame 2, which is used to clamp the rotating shaft 42. For the sake of convenience, the two end heads of the rotating shaft 42 are respectively named as the first end head 425 and the second end head 426. In this embodiment, the limiting groove 91 is arranged on the bottom wall of the door frame 2, the lower end head of the rotating shaft 42 is the first end head 425, and the upper end head is the second end head 426. The first end heads 425 of the two rotating shafts 42 are used to clamp with the limiting groove 91, and to ensure that the door panel 4 can rotate, the two rotating shafts 42 will not be clamped with the limiting groove 91 at the same time when the door panel 4 rotates, and the switching mechanism 7 is used to drive the two rotating shafts 42 to move along its own axial direction to switch the two rotating shafts 42 to connect or disconnect with the limiting groove 91. The two rotating shafts 42 are connected to the door panel 4 through a spline, so that the rotating shaft 42 remains connected with the door panel 4 during the movement.

[0048] Specifically, the switching mechanism 7 includes a push rod 792, a driving structure for driving the push rod 792 to move, and a transmission mechanism 8 connected between the two rotating shafts 42. The driving structure drives the push rod 792 to move, and pushes one of the rotating shafts 42 to move along its own axial direction and connect to the limiting groove 91, and transmits power to the other rotating shaft 42 through the transmission mechanism 8, and causes the other rotating shaft 42 to move axially and disengage from the limiting groove 91. In this embodiment, the rotating shaft 42 on the left is the main shaft 423, and the rotating shaft 42 on the right is the spare shaft 424. The push rod 792 is used to push the spare shaft 424 to move.

[0049] This application discloses the following specific embodiments:

[0050] Example 1

[0051] As attached Figure 1As shown, for the driving structure, a screw structure 6 is used as the drive in this embodiment. The screw structure 6 is installed on the top wall of the door frame 2, and the push rod 792 is fixedly connected to the telescopic end of the screw structure 6. The push rod 792 is driven to move downward by the screw structure 6 and abuts against the second end 426 of the spare shaft 424, thereby pushing the spare shaft 424 to move downward; in other embodiments, the screw structure 6 can be installed on the side wall of the door frame 2 to drive the push rod 792 to translate in the left and right directions, that is, to move along the radial direction of the spare shaft 424, and a bevel 422 is opened on the second end 426 of the spare shaft 424, so that the push rod 792 abuts against the bevel 422 during the translation process, and the spare shaft 424 is pushed downward under the action of the push rod 792.

[0052] The transmission mechanism 8 includes two connecting gears, two racks 83 and a belt transmission assembly 82. The two racks 83 are fixedly connected to the two rotating shafts 42, and the racks 83 are arranged axially along the rotating shaft 42. The two connecting gears are respectively engaged with the two racks 83, and the belt transmission assembly 82 is connected between the two connecting gears. Figure 2 As shown, in this embodiment, the two connecting gears are located between the main shaft 423 and the spare shaft 424. The spare shaft 424 moves downward, and the main shaft 423 moves upward and disengages from the limit groove 91 through the gear rack 83 and the belt transmission assembly 82, thereby realizing the switching of the connection status of the spare shaft 424, the main shaft 423 and the door frame 2, so that the door panel 4 rotates around the main shaft 423 and switches to rotate around the spare shaft 424.

[0053] In addition, the main shaft 423 and the spare shaft 424 need to be rotated to open and close the door panel 4. In order to maintain the connection between the connecting gear and the rack 83, as shown in the attached Figure 3 As shown, in this embodiment, the rack 83 adopts an annular rack, and the axes of the two annular racks coincide with the main shaft 423 and the spare shaft 424 respectively. In other embodiments, the annular rack can be integrally formed with the main shaft 423 / spare shaft 424.

[0054] This application also discloses two other embodiments of the transmission mechanism:

[0055] Example 2

[0056] In this embodiment, the transmission mechanism 8 includes two connecting gears, two racks 83 and a group of belt transmission components 82. The two racks 83 are fixedly connected to the two rotating shafts 42 respectively, and the racks 83 are arranged axially along the rotating shaft 42. The two connecting gears are respectively engaged with the two racks 83, and the belt transmission component 82 is connected between the two connecting gears. The difference from the first embodiment is that the two connecting gears are respectively located on the same side of the main shaft 423 and the spare shaft 424. Figure 4As shown, for the convenience of explanation, the connecting gear meshing with the rack 83 on the spare shaft 424 is the driving gear 84, and the connecting gear meshing with the rack 83 on the main shaft 423 is the driven gear 86. The driving gear 84 is located on the left side of the spare shaft 424 and meshes with the rack 83, and the driven gear 86 is located on the left side of the main shaft 423 and meshes with the rack 83. In other embodiments, the driving gear 84 can also be arranged on the right side of the spare shaft 424 and meshes with the rack 83, and the driven gear 86 can be arranged on the right side of the main shaft 423 and meshes with the rack 83. At this time, the spare shaft 424 moves downward, and the gear rack 83 and the belt transmission assembly 82 cause the main shaft 423 to move downward as well.

[0057] In addition, the driven gear 86 is an incomplete gear. After the spare shaft 424 is stuck in the limiting groove 91, the rack 83 on the main shaft 423 disengages from the driven gear 86; a pressure plate 93 is slidingly set in the limiting groove 91, and a reset member 92 is provided on the pressure plate 93. In this embodiment, the reset member 92 is a reset spring, which is connected between the pressure plate 93 and the bottom wall of the limiting groove 91. During the downward movement of the main shaft 423, the pressure plate 93 is pushed down and the reset spring is squeezed. When the driven gear 86 disengages from the rack 83, the main shaft 423 is pushed up by the reset spring until it disengages from the limiting groove 91.

[0058] In the first embodiment, when the backup shaft 424 moves downward, the main shaft 423 moves upward. It may happen that neither the backup shaft 424 nor the main shaft 423 engages the limiting groove 91. At this time, the door panel 4 will fall off the door frame 2. In the second embodiment, when the backup shaft 424 moves downward, it first drives the main shaft 423 downward to ensure the connection between the door panel 4 and the door frame 2, and a reset member 92 is provided to push the main shaft 423 upward to disengage from the limiting groove 91 after the driven gear 86 is disengaged from the rack 83, thereby completing the switching between the backup shaft 424 and the main shaft 423 and preventing the door panel 4 from falling off during the switching process.

[0059] Example 3

[0060] The difference from the second embodiment is that: Figure 5 As shown, the driving gear 84 and the driven gear 86 are arranged between the main shaft 423 and the spare shaft 424, and a steering gear 85 is engaged with the driving gear 84, and the belt transmission assembly 82 is connected between the steering gear 85 and the driven gear 86; the steering gear 85 is set to make the driving gear 84 and the driven gear 86 rotate in opposite directions, so that when the spare shaft 424 moves downward, the main shaft 423 is driven downward first, and after the driven gear 86 is disengaged from the rack 83, the reset member 92 pushes the main shaft 423 to move upward and disengage from the limit groove 91.

[0061] Compared with the second embodiment, the length of the belt drive assembly 82 is shortened, which can reduce the space occupied by the transmission mechanism 8, thereby leaving more space in the door panel 4 for filling the fireproof material.

[0062] This application also discloses another embodiment of the driving mechanism:

[0063] Example 4

[0064] As attached Figure 6-7 As shown, the difference from Example 1 is that the driving structure of this embodiment includes a separator 781, an adjusting member 782 and a driving source for driving the adjusting member 782 to move, the separator 781 is fixedly connected to the push rod 792, the adjusting member 782 is frustum-shaped, the separator 781 abuts against the circumference of the adjusting member 782, the driving source is used to drive the adjusting member 782 to move along its own axial direction, and move the separator 781 along the circumference of the adjusting member 782 toward the axis away from the adjusting member 782, the separator 781 moves smoothly and without setbacks, thereby driving the push rod 792 to move and pushing the spare shaft 424 to move smoothly downward.

[0065] It should be noted that when the separating member 781 abuts against the peripheral surface of the adjusting member 782 and is located directly below / directly above the axis of the adjusting member 782, the adjusting member 782 pushes the separating member 781 to move downward / upward, which is then used to drive the push rod 792 to move downward / upward; when the separating member 781 abuts against other positions on the peripheral surface of the adjusting member 782, the adjusting member 782 can push the separating member 781 to move in the left and right directions, thereby realizing the left and right lateral movement of the push rod 792.

[0066] In addition, an arc surface 788 is formed at the end of the separating member 781 that contacts the adjusting member 782 to prevent the separating member 781 and the adjusting member 782 from being stuck when the separating member 781 contacts the adjusting member 782 .

[0067] In this embodiment, as shown in the attached Figure 8-9As shown, the driving source includes a connecting plate 784, an electromagnetic spring 785 and a control unit 786. The connecting plate 784 is fixedly connected to the separating piece 781. The electromagnetic spring 785 is connected between the connecting plate 784 and the control unit 786. The control unit 786 is provided with a built-in power supply. A smoke sensor switch and a temperature sensor switch are provided on the circuit between the electromagnetic spring 785 and the built-in power supply. The control unit 786 is provided on the inner wall of the ventilation duct 787 to detect the temperature and smoke of the air flowing in the ventilation duct 787. The fire situation is judged by monitoring the two conditions of smoke and temperature. When the smoke content and temperature reach When the threshold value set by the sensor is reached, the two switches are closed and the electromagnetic spring 785 is energized through the built-in power supply. In order to finally move the spare shaft 424 downward and overcome the elastic force of the reset part 92 to be stuck in the limit groove 91, the elastic force of the electromagnetic spring 785 needs to be greater than the elastic force of the reset part 92, and push the connecting plate 784 to realize the movement of the separation part 781. Two switches are set to improve the fault tolerance rate. For example, if a single temperature sensor switch is set, the temperature sensor switch will also be closed in high temperature weather, making the circuit pass, causing the door panel 4 to switch the spare shaft 424 and the main shaft 423 when no fire occurs, resulting in a waste of fire door resources.

[0068] A manually controlled manual switch can be installed in the circuit between the electromagnetic spring 785 and the built-in power supply. The manual switch is set in parallel with the smoke sensor switch and the temperature sensor switch to solve the hidden danger that the circuit cannot be closed due to sensor failure.

[0069] In addition, a guide groove 783 is provided in the wall 1 to guide the sliding of the connecting plate 784 and the adjusting member 782 .

[0070] In a further setting of the present application, a connecting rod is connected to the push rod 792, and the other end of the connecting rod is connected to the main rod 791. The main rod 791 is abutted and supported on the second end 426 of the main shaft 423. The main rod 791 supports the second end 426 of the main shaft 423, and the limiting groove 91 clamps the first end 425 of the main shaft 423, so that the main shaft 423 is guaranteed to be stable when the door panel 4 rotates around the main shaft 423; similarly, after the push rod 792 pushes the spare shaft 424 so that its first end 425 is clamped into the limiting groove 91, the push rod 792 abuts against the second end 426 of the spare shaft 424, and the limiting groove 91 clamps the first end 425 of the spare shaft 424. At this time, the door panel 4 rotates around the spare shaft 424, and the stability of the spare shaft 424 during rotation is guaranteed by the push rod 792 and the limiting groove 91.

[0071] In addition, the push rod 792 is connected to the main rod 791 by a connecting rod, so that when the driving structure drives the push rod 792 to move horizontally, the main rod 791 is driven by the connecting rod to move horizontally and disengage from the second end 426 of the main shaft 423, thereby preventing the main rod 791 from blocking the main shaft 423 from moving upward when it disengages from the limiting groove 91.

[0072] Specifically, this application provides the following embodiments:

[0073] Example 5

[0074] Any one of the three transmission mechanisms can be combined with one of the two drive structures for driving the push rod 792 to move horizontally. In this embodiment, the transmission mechanism in the third embodiment and the drive structure in the fourth embodiment are combined as an example. Figure 10 As shown, a connecting rod is fixedly connected to the left end of the push rod 792, and the left end of the connecting rod is fixedly connected to the main rod 791, and the main rod 791 is supported on the upper end of the main shaft 423 (ie, the second end 426).

[0075] As attached Figure 11 As shown, a slide rail 75 is installed on the wall 1, and two sliders 76 are slidably connected to the slide rail 75. The two sliders 76 are fixedly connected to the main rod 791 and the push rod 792 respectively. A support spring 77 is connected between the slider 76 and the side wall of the slide rail 75. The slider 76 and the slide rail 75 are provided to guide the lateral translation of the main rod 791 and the push rod 792, and the support spring 77 plays a buffering role.

[0076] In order to facilitate the installation of the slider 76 on the main rod 791 and the push rod 792 and the installation of the connecting rod between the main rod 791 and the push rod 792, a connecting piece 71 is provided on the main rod 791 and the push rod 792, and the slider 76 and the connecting rod are both connected to the connecting piece 71. The connecting piece 71 can be integrally formed with the main rod 791 and the push rod 792.

[0077] Example 6

[0078] Any one of the transmission mechanisms in the second and third embodiments can be arbitrarily combined with one of the two driving structures for driving the push rod 792 to move horizontally left and right.

[0079] In this embodiment, the transmission mechanism in the third embodiment and the driving structure in the fourth embodiment are combined as an example. The difference from the fifth embodiment is that: Figure 12 As shown, a clamping hole 421 is opened at the axis center of the second end 426 of the main shaft 423 and the spare shaft 424. The clamping hole 421 is used to clamp the main rod 791 and the push rod 792, thereby improving the supporting effect of the main rod 791 and the push rod 792 on the main shaft 423 and the spare shaft 424. In this embodiment, the driving structure drives the spare shaft 424 to move downward, and cooperates with the reset member 92 through the transmission mechanism 8 to realize that the main shaft 423 moves downward first and then moves upward to disengage from the limit groove 91.

[0080] When the push rod 792 moves horizontally to the locking hole 421 facing the spare shaft 424, the first end 425 of the spare shaft 424 will be stuck in the locking hole 421, and the spare shaft 424 will move downward. Figure 12 As shown, the backup shaft 424 moves upward under the elastic force of the reset member 92 and causes the push rod 792 to be locked in the locking hole 421.

[0081] During the above movement, since the main rod 791 is initially stuck in the clamping hole 421 of the main shaft 423, when the main rod 791 is not separated from the main shaft 423, the main rod 791 will not move synchronously with the translation of the push rod 792. In order to avoid the translation of the push rod 792 being stuck, as shown in the attached figure, Figure 11 As shown, the connecting rod between the main rod 791 and the push rod 792 includes a piston 73 and a cylinder 72. The piston 73 and the cylinder 72 are slidably connected, and the piston 73 and the cylinder 72 are respectively fixedly connected to the main rod 791 and the push rod 792. Specifically, before the main rod 791 is separated from the main shaft 423, the push rod 792 translates and causes the piston 73 and the cylinder 72 to slide relative to each other, while compressing the gas in the cylinder 72. After the main rod 791 is separated from the main shaft 423, the compressed gas in the cylinder 72 pushes the main rod 791 to translate toward the side away from the push rod 792, and moves the main rod 791 away from directly above the main shaft 423. This can also prevent the main shaft 423 from moving upward under the action of the reset member 92 and re-engaging with the main rod 791.

[0082] In addition, the spare shaft 424 will also move upward under the action of the reset member 92 and engage with the push rod 792. At this time, in order to prevent the spare shaft 424 from disengaging from the limit groove 91, the length of the inclined surface 422 along the axial direction of the spare shaft 424 (i.e., the vertical direction) must be greater than the depth of the locking hole 421 along the axial direction of the spare shaft 424, so that the downward movement stroke of the spare shaft 424 is greater than the upward movement stroke, ensuring that the first end 425 of the spare shaft 424 can be engaged with the limit groove 91.

[0083] Example 7

[0084] As attached Figure 13-14As shown, the difference from Example 5 is that: this embodiment adopts the transmission mechanism of Example 1 and the drive structure of Example 4. In addition, this embodiment provides two door panels 4 distributed on the left and right, the two middle rotating shafts 42 are spare shafts 424, and the two rotating shafts 42 on both sides are main shafts 423. Initially, the two door panels 4 rotate from the middle to the sides to open and close.

[0085] The adjusting member 782 is arranged above the junction of the two door panels 4, and the left and right ends of the circumference of the adjusting member 782 are abutted against the separating members 781. By driving the adjusting member 782 forward through the driving source, the separating members 781 on both sides can be pushed to slide at the same time, thereby switching the main shaft 423 and the spare shaft 424 of the two door panels 4 at the same time.

[0086] Example 8

[0087] As attached Figure 15 As shown, the difference from the seventh embodiment is that this embodiment adopts the transmission mechanism of the third embodiment and the driving structure of the fourth embodiment.

[0088] Embodiment 9

[0089] As attached Figure 16 As shown, the difference from the fifth embodiment is that in this embodiment, the spare shaft 424 is installed at the center of the door panel 4, and the main shaft 423 is installed at the left edge of the door panel 4.

[0090] Example 10

[0091] As attached Figure 17 As shown, the difference from the fifth embodiment is that two door panels 4 are provided in this embodiment, wherein one door panel 4 is connected to the door frame 2 via a hinge 10 , and the other door panel 4 is connected to the door frame 2 via two rotating shafts 42 .

[0092] The implementation principle of a fire door disclosed in the embodiment of this application (specifically described using the fire door in Example 6):

[0093] In the initial state, the main rod 791 is inserted into the locking hole 421 of the main shaft 423, the first end 425 of the main shaft 423 is inserted into the limiting groove 91, the push rod 792 is in contact with the spare shaft 424, the first end 425 of the spare shaft 424 is not inserted into the limiting groove 91, and the driven gear 86 is engaged with the rack 83 on the main shaft 423. At this time, the door panel 4 can be rotated around the main shaft 423 for opening and closing.

[0094] In case of fire, Figure 6 The direction is used as a reference, and combined with the attached Figure 9The driving source energizes the electromagnetic spring 785, driving the adjusting member 782 to slide forward and pushing the separating member 781 to move leftward, thereby driving the push rod 792 to move leftward and abut against the inclined surface 422 of the backup shaft 424. Under the action of the push rod 792, the backup shaft 424 is pushed downward and compresses the reset member 92. During the leftward movement of the push rod 792, the piston 73 slides relative to the cylinder 72 and compresses the gas in the cylinder 72.

[0095] During the downward movement of the backup shaft 424, the driving gear 84 is driven to rotate by the rack 83, and the driving gear 84 drives the steering gear 85 to rotate. The steering gear 85 drives the driven gear 86 to rotate via the belt transmission assembly 82. The driven gear 86 drives the main shaft 423 downward via the rack 83 until the main rod 791 is disengaged from the main shaft 423. At this time, the compressed gas in the cylinder 72 pushes the main rod 791 to move left and away from above the main shaft 423.

[0096] When the driven gear 86 is disengaged from the rack 83 , the main shaft 423 moves upward under the elastic force of the reset member 92 and disengages from the limiting groove 91 .

[0097] When the push rod 792 is facing the locking hole 421 on the backup shaft 424, the backup shaft 424 moves upward under the action of the reset member 92 and causes the push rod 792 to be locked in the limiting groove 91. At this time, the door panel 4 can be rotated around the backup shaft 424 for opening and closing.

[0098] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A fire door, comprising a door frame (2) and a door panel (4), wherein the door panel (4) is rotatably mounted on the inner side of the door frame (2) via a rotating shaft (42), characterized in that: There are two rotating shafts (42) and they are arranged in parallel. The two rotating shafts (42) are connected to the door panel (4) via splines. The ends of the rotating shaft (42) are respectively a first end (425) and a second end (426). The fire door further comprises a limiting structure (9) arranged on the door frame (2) and used for clamping the first end (425), and a switching mechanism (7) for driving the rotating shaft (42) to move along its own axial direction and connect / disconnect with the limiting structure (9). The limiting structure (9) comprises a switch provided on the door frame (2) and used for clamping the first end (425). The switching mechanism (7) comprises a push rod (792) for pushing one of the rotating shafts (42) to move along its own axial direction and connected to the limiting groove (91), a driving structure for driving the push rod (792) to move, and a transmission mechanism (8) connected between the two rotating shafts (42), wherein the transmission mechanism (8) is used to transmit the power of the rotating shaft (42) pushed by the push rod (792) to the other rotating shaft (42), and to make the other rotating shaft (42) move axially and disengage from the limiting groove (91); through the push rod (792) The rotating shaft (42) pushed is a spare shaft (424), and the other rotating shaft (42) is a main shaft (423); the driving structure is used to drive the push rod (792) to move radially along the spare shaft (424); a connecting rod is connected to the push rod (792), and the other end of the connecting rod is connected to the main rod (791); the main rod (791) supports the second end (426) of the main shaft (423); the second end (426) of the spare shaft (424) is provided with an inclined surface (422) on its circumference for contacting with the push rod (792); the main shaft (423) and the A clamping hole (421) is provided at the axis center of the second end (426) of the spare shaft (424), and the clamping hole (421) is used to clamp the main rod (791) and the push rod (792). The connecting rod includes a piston (73) and a cylinder (72), and the piston (73) and the cylinder (72) are slidably connected, and the piston (73) and the cylinder (72) are respectively fixedly connected to the main rod (791) and the push rod (792); the axial length of the inclined surface (422) along the spare shaft (424) is greater than the axial depth of the clamping hole (421) along the spare shaft (424).

2. A fire door according to claim 1, characterized in that: The transmission mechanism (8) comprises two connecting gears, two racks (83) and a group of belt transmission components (82), wherein the two racks (83) are respectively fixedly connected to the two rotating shafts (42) and are axially arranged along the rotating shafts (42), the two connecting gears are respectively engaged with the two racks (83), and the belt transmission component (82) is connected between the two connecting gears and enables the two connecting gears to rotate in the same direction.

3. A fire door according to claim 1, characterized in that: The transmission mechanism (8) comprises a driving gear (84), a driven gear (86), two racks (83), a direction-adjusting gear (85) and a group of belt transmission components (82). The two racks (83) are respectively fixedly connected to the two rotating shafts (42) and arranged axially along the rotating shaft (42). The driving gear (84) is meshed with the racks (83) on the spare shaft (424). The driven gear (86) is meshed with the racks (83) on the main shaft (423). The driven gear (86) is an incomplete gear. The direction-adjusting gear (85) is meshed with the driving gear (84). The belt transmission component (82) is connected between the direction-adjusting gear (85) and the driven gear (86). A pressure plate (93) is slidably provided in the limiting groove (91) and abuts against the first end head (425). A reset member (92) is connected to the pressure plate (93).

4. A fire door according to claim 3, characterized in that: The driving structure includes a separating member (781), an adjusting member (782) and a driving source. The separating member (781) is fixedly connected to the push rod (792). The adjusting member (782) is in a frustum shape. The separating member (781) abuts against the peripheral surface of the adjusting member (782). The adjusting member (782) is connected to the output end of the driving source, and the adjusting member (782) is driven by the driving source to move along its own axial direction.

5. A fire door according to claim 4, characterized in that: The driving source includes a connecting plate (784), an electromagnetic spring (785) and a control unit (786); the connecting plate (784) is fixedly connected to the separating member (781); the electromagnetic spring (785) is connected between the connecting plate (784) and the control unit (786); the control unit (786) is provided with a built-in power supply; a smoke sensor switch and a temperature sensor switch are provided on the circuit between the electromagnetic spring (785) and the built-in power supply.

6. The fire door according to claim 1, characterized in that: A filling material (5) is provided in the door panel (4), and the filling material (5) is a composite gelling material of magnesium hydroxide and magnesium chloride.

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