A closure device for a double door

Abstract

The utility model relates to the locking field of door body, concretely relates to a locking device for double door body, including two winding drums, spacing block and operation box, the winding drum is equipped with the wire rope on, and each winding drum is connected with the door body through the wire rope, the spacing groove that is adapted with spacing block is opened to winding drum, wherein the rotation of a winding drum can make spacing block rotate, and make spacing block be stuck in the spacing groove of another winding drum and prevent another winding drum from rotating, each winding drum is equipped with the self locking assembly that prevents its autorotation, the operation box is provided with two fixed beams, the fixed beam is arranged in operation box before and after, winding drum is set up between two fixed beams through rotating shaft, and the both ends of rotating shaft are rotatably connected on the fixed beam, and the self locking assembly is set up in the front side of the fixed beam of the front side, the utility model discloses through mechanical type locking device has realized the purpose of preventing two doors from opening simultaneously, and mechanical type locking device is more stable compared with electrical locking device, and the cost is lower.

Description

Technical Field

[0001] This utility model relates to the field of door locking, specifically to a locking device for double doors. Background Technology

[0002] Currently, two doors in underground coal mines cannot be opened simultaneously because doing so would cause a short circuit in the airflow. This would derail the airflow, leading to areas with little or no airflow and potentially causing gas buildup or exceeding safety limits. Therefore, electrical interlocking is currently used in coal mines to prevent simultaneous opening of both doors. However, electrical equipment is expensive, and its performance is unreliable and has a short lifespan due to the harsh underground environment, exposed to water vapor, water spray, and coal dust. Therefore, there is an urgent need for a stable, reliable, and low-cost double-door interlocking device. Utility Model Content

[0003] The purpose of this invention is to provide a locking device for double doors that can reliably and cost-effectively prevent both doors from opening simultaneously.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A locking device for double doors includes two drums and a limiting block; each drum is equipped with a wire rope, and each drum is connected to the door body via the wire rope; each drum has a limiting groove adapted to the limiting block, wherein rotation of one drum causes the limiting block to rotate, and the limiting block is locked in the limiting groove of the other drum to prevent the other drum from rotating; each drum is equipped with a self-locking component to prevent it from rotating on its own.

[0005] Furthermore, the device includes an operation box containing two fixed beams arranged front to back within the operation box; a drum is positioned between the two fixed beams via a rotating shaft, with both ends of the rotating shaft rotatably connected to the fixed beams; and a self-locking assembly is located on the front side of the fixed beam located at the front.

[0006] Furthermore, the self-locking assembly includes a ratchet, a stop pawl, and a tension spring; the ratchet is fixedly connected to the rotating shaft, one end of the stop pawl is rotatably connected to the fixed beam, and the other end is locked onto the ratchet; one end of the tension spring is fixed to the fixed beam by a fixing block, and the other end is connected to the stop pawl to provide tension to the stop pawl.

[0007] Furthermore, a guide rod is provided on the rear fixed beam, and the limiting block is sleeved on the guide rod. The limiting block can rotate circumferentially along the guide rod and move axially along the guide rod. A control handle is hinged to the front side of the limiting block. The control handle is located on the front side of the front fixed beam, and the contact part between the control handle and the fixed beam is arc-shaped when the control handle rotates.

[0008] Furthermore, the left and right sides of the operation box are respectively provided with through holes for the steel wire rope to pass through, and the steel wire rope is equipped with a tensioning wheel assembly, which is fixed to one side of the operation box by a fixing seat.

[0009] Furthermore, the tensioning wheel assembly includes two tensioning wheels arranged in a vertical direction; the wire rope passes through the through hole, wraps around the bottom of one tensioning wheel, and is connected to the door body.

[0010] Furthermore, the front side of the control box is provided with a window to facilitate the operation of the control handle by the worker, and the window is provided with a cover plate.

[0011] Furthermore, the top rear side of the operation box is provided with a fixing ear for hanging.

[0012] Compared with the prior art, this utility model has the following advantages and beneficial effects: This invention utilizes a limiting groove on the roller and a limiting block adapted to that groove. When one roller rotates due to the door opening, it drives the limiting block to rotate, causing the other side of the limiting block to lock the other roller through the limiting groove, preventing the other roller from rotating and thus preventing the other door from opening. This invention achieves the purpose of preventing two doors from opening simultaneously through a mechanical locking device. Mechanical locking devices are more stable and less expensive than electrical locking devices. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of a locking device for double doors.

[0014] Figure 2 This is a schematic diagram of two rollers.

[0015] Figure 3 This is a schematic diagram of a single roll.

[0016] Figure 4 This is a schematic diagram of the control panel window.

[0017] Figure 5 This is a schematic diagram of an operating box with a cover.

[0018] Figure 6 Top view showing the connection between the control handle and the limit block.

[0019] Figure 7 This is an exploded view of the guide rod and the limiting block. Detailed Implementation

[0020] like Figure 1 and Figure 3As shown, a locking device for double doors includes two rollers 1, a limiting block 2, and an operating box 3. Each roller 1 is equipped with a steel wire rope, and each roller 1 is connected to a door via the steel wire rope. Each roller 1 has a limiting groove 4 that matches the limiting block 2. Rotation of one roller 1 causes the limiting block 2 to rotate, locking it in the limiting groove 4 of the other roller 1 to prevent it from rotating. Each roller 1 is equipped with a self-locking component to prevent its own rotation. The two rollers 1 are arranged left and right and are connected to their respective side doors via steel wire ropes. When the left door is opened by a worker, the left roller 1 is driven to rotate by the steel wire rope. The left roller 1 drives the limiting block 2 to rotate, and the right side of the limiting block 2 locks in the limiting groove 4 of the right roller 1, preventing the right roller 1 from rotating. In other words, the right door cannot be opened if the left door is open.

[0021] The operation box 3 is provided with two fixed beams 11, which are arranged one in front of the other in the operation box 3. The drum 1 is set between the two fixed beams 11, and the two ends of the rotating shaft 12 are rotatably connected to the fixed beams 11 respectively. A bearing is provided between the rotating shaft 12 and the fixed beams 11 to facilitate the rotation of the rotating shaft 12 relative to the fixed beams 11. The self-locking component is set on the front side of the fixed beam 11, and the self-locking component can effectively prevent the drum 1 from rotating back.

[0022] The self-locking assembly includes a ratchet 21, a stop pawl 22, and a tension spring 23. The ratchet 21 is fixedly connected to the rotating shaft 12. One end of the stop pawl 22 is rotatably connected to the fixed beam 11, and the other end is engaged with the ratchet 21. One end of the tension spring 23 is fixed to the fixed beam 11 by a fixing block 24, and the other end is connected to the stop pawl 22 to provide tension to the stop pawl 22. When the drum 1 rotates, the ratchet 21 rotates synchronously with the rotating shaft 12. When the ratchet 21 rotates, the stop pawl 22 rotates relative to the fixed beam 11 and, under the action of the tension spring 23, remains engaged with the ratchet 21, preventing the rotating shaft 12 from rotating back.

[0023] like Figure 4 and Figure 5 As shown, a guide rod 31 is provided on the rear fixed beam 11, and the limiting block 2 is sleeved on the guide rod 31. The limiting block 2 can rotate circumferentially along the guide rod 31 and move axially along the guide rod 31. A control handle 32 is hinged to the front side of the limiting block 2. The control handle 32 is located on the front side of the front fixed beam 11, and the contact part between the control handle 32 and the fixed beam 11 is arc-shaped when the control handle 32 rotates. The arc shape allows for a smooth transition, reducing the force required for the worker to rotate the control handle 32. Figure 6 and Figure 7As shown, the operation box 3 has a window 33 on its front side for easy operation of the control handle 32 by the worker, and a cover plate 34 is provided on the window 33. When it is necessary to move equipment or for emergency evacuation, the two doors can be opened simultaneously for a short time. At this time, the worker needs to open the cover plate 34 and operate the control handle 32 from the window 33. The worker only needs to control one end of the handle 32 to make the control handle 32 rotate relative to the limit block 2. Since the front-to-back distance between the hinge point of the control handle 32 and the limit block 2 and the fixed plate is less than the distance between the hinge point of the control handle 32 and the limit block 2 and the left edge of the control handle 32, as the control handle 32 rotates, the limit block 2 will move forward along the axial direction of the guide rod 31, so that the limit block 2 is located in the groove of the drum 1 for placing the wire rope, so that the two drums 1 can rotate at the same time, that is, to achieve the purpose of opening the two doors at the same time.

[0024] The operation box 3 has through holes on its left and right sides for the steel wire rope to pass through. The steel wire rope is equipped with a tensioning wheel assembly, which is fixed to one side of the operation box 3 by a fixing seat 41. The tensioning wheel assembly includes two tensioning wheels 42, which are arranged vertically. The steel wire rope passes through the through hole, wraps around the bottom of one tensioning wheel 42, and connects to the door body. The tensioning wheel 42 is needed to tension the steel wire rope as it passes through the through hole. Different tensioning wheels 42 are selected for different door bodies or door bodies at different distances, and the two tensioning wheels 42 provide different tension forces to the steel wire rope.

[0025] The top rear side of the operation box 3 is provided with a fixing ear 43 for hanging. The fixing ear 43 is used to hang the operation box 3 in a suitable position so that workers can operate it.

[0026] Of course, the above description is not intended to limit the present utility model, and the present utility model is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should also fall within the protection scope of the present utility model.

Claims

1. A locking device for double doors, characterized in that, It includes two drums and a limiting block; each drum is equipped with a steel wire rope, and each drum is connected to the door body by the steel wire rope; each drum has a limiting groove adapted to the limiting block, wherein the rotation of one drum can cause the limiting block to rotate, and the limiting block is locked in the limiting groove of the other drum to prevent the drum from rotating; each drum is equipped with a self-locking component to prevent it from rotating on its own.

2. A locking device for double doors according to claim 1, characterized in that, The device includes an operation box containing two fixed beams arranged front to back within the operation box; a drum is positioned between the two fixed beams via a rotating shaft, with both ends of the rotating shaft rotatably connected to the fixed beams; and a self-locking assembly is located on the front side of the front fixed beam.

3. A locking device for double doors according to claim 2, characterized in that, The self-locking assembly includes a ratchet, a stop pawl, and a tension spring; the ratchet is fixedly connected to the rotating shaft, one end of the stop pawl is rotatably connected to the fixed beam, and the other end is locked onto the ratchet; one end of the tension spring is fixed to the fixed beam by a fixing block, and the other end is connected to the stop pawl to provide tension to the stop pawl.

4. A locking device for double doors according to claim 2, characterized in that, A guide rod is provided on the fixed beam on the rear side, and the limiting block is sleeved on the guide rod. The limiting block can rotate circumferentially along the guide rod and move axially along the guide rod. A control handle is hinged to the front side of the limiting block. The control handle is located on the front side of the fixed beam on the front side, and the contact part between the control handle and the fixed beam is arc-shaped when the control handle rotates.

5. A locking device for double doors according to claim 2, characterized in that, The operating box has through holes on its left and right sides for the steel wire rope to pass through. The steel wire rope is equipped with a tensioning wheel assembly, which is fixed to one side of the operating box by a fixing seat.

6. A locking device for double doors according to claim 5, characterized in that, The tensioning wheel assembly includes two tensioning wheels arranged vertically; a steel wire rope passes through a through hole, wraps around the bottom of one tensioning wheel, and connects to the door body.

7. A locking device for double doors according to claim 2, characterized in that, The control box has a window on the front side to facilitate the operation of the control handle by the worker, and the window is covered with a cover plate.

8. A locking device for double doors according to claim 2, characterized in that, The top rear side of the control box is provided with a mounting lug.

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