Transmission device capable of being automatically and manually switched for heavy load door

Abstract

The invention relates to the technical field of transmission devices, and provides a transmission device capable of being automatically and manually switched for a heavy-load door, which comprises a driving device for driving a heavy-load door curtain to be rolled or unrolled, and an output shaft of a motor extends to one end far away from the heavy-load door curtain to form an output connecting shaft penetrating out of the tail end of the motor. The transmission device comprises a shell, a hand-pulling chain wheel, a chain wheel shaft, a first compression spring, a second compression spring, a flat key, an ejector pin shaft and a position adjusting mechanism, and the section, provided with the hollow containing cavity, of the chain wheel shaft is axially provided with an open groove allowing the flat key to move to be embedded into a hand-pulling chain wheel key groove or be separated from the hand-pulling chain wheel key groove. The position adjusting mechanism is arranged on the shell, located on the side, away from the second compression spring, of the end cover of the ejector pin shaft and abuts against the end cover of the ejector pin shaft, or the position adjusting mechanism presses the ejector pin shaft towards the flat key to drive the flat key to be embedded into a key groove of the hand zipper wheel. The problem that a manual door opening or closing switching transmission device of an existing heavy rolling gate is complex in structure or unstable in structure is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of transmission devices, in particular to a transmission device capable of automatically and manually switching a heavy-duty door. BACKGROUND

[0002] The heavy-duty door is also called heavy-duty rolling shutter door. The heavy-duty rolling shutter door is a door system using high-strength profiles (such as aluminum alloy or stainless steel), large-area door panels and heavy-duty hardware fittings. It is designed for large-span doorways (usually more than 2 meters wide and up to more than 3 meters high) and can bear a large weight (up to 200-800 kg per leaf). It is widely used in various places, such as factories, warehouses and other places with strong winds in coastal areas; sports venues, airplane hangars and other places requiring large-span doorways; areas with frequent loading and unloading of goods, which can quickly open and close to reduce heat loss; separate different work areas to maintain a clean environment or control noise; and other places. The structure of the heavy-duty door in the prior art is complex. In particular, when opening and closing in a power-off state, the operation procedure is complex and difficult to master, or the structure is not stable and reliable although the operation is convenient.

[0003] For example, Chinese patent document CN200810146496.8 discloses an automatic switching transmission device for an industrial door opener. The core of the present application is to introduce a bidirectional lead cam and a critical fixed device. The bidirectional lead cam is fixedly installed in the axial direction and, under the action of the critical fixed device, does not rotate in the initial state. When the hand-pulled sprocket fixed to the same core shaft as the bidirectional lead cam is pulled in any direction, component A can slide from the low point of the spiral surface or thread groove to the highest point, thereby realizing the axial movement of the core shaft in the same direction. In combination with the bevel gear pair and the power switch, the "motor-driven" mode can be flexibly switched to the "manual-driven" mode. When the hand-pulled sprocket is released, the core shaft is restored under the action of the core shaft restoring device, and the "motor-driven" mode is switched back. For another example, CN201710942912.4 discloses a household door and window roller mechanism using a simple and easy manual adjustment mode with a clutch. The mechanism includes a roller support main body mechanism, a roller clutch device, a roller manual drive device connected to the roller clutch device, and a roller drive device installed above the roller support main body mechanism. The roller support main body mechanism includes two roller shaft corner supports located at the upper corners of the door and window on both sides, roller side frames installed on both sides of the door and window, and a roller cross bar frame connected between the two roller shaft corner supports. The roller manual drive device includes a rotating gear box, a manual rotating gear installed in the rotating gear box, and a rack meshed with the manual rotating gear. The rotating gear box is installed on the side surface of the concave clutch disc through a support. The manual rotating gear is connected to the roller clutch device through a rotating gear shaft. The ends of the rack are connected to a hand-pulled rope, and a limiting block is arranged at the connection between the rack and the hand-pulled rope.

[0004] However, the above-mentioned patent document discloses a technology of driving the motor shaft to rotate by gear engagement, that is, the rotating force of the zipper when pulled drives the gear to engage the gear with the motor shaft, and the motor shaft is driven to rotate by the gear to achieve manual opening. However, when the roller shutter door is a heavy roller shutter door, the engagement force of the gear with the motor shaft is not enough due to the heavy door itself, and the gear rebounds to cause gear slip, so the heavy roller shutter door cannot be pulled. Therefore, it is not suitable for automatic and manual switching of heavy roller shutter doors, especially when the above-mentioned patent structure is used to switch the heavy roller shutter door to manually open or close the door when power is off, it is difficult to achieve opening or closing. SUMMARY

[0005] Therefore, in view of the above problems, the present application provides a heavy door automatic and manual switching transmission device, which can automatically and manually switch to control the opening or closing of the heavy roller shutter door quickly and conveniently. The transmission structure is stable and reliable.

[0006] To solve the technical problem, the application adopts the following scheme: a heavy-duty door automatic and manual switching transmission device, comprising a drive device for driving a heavy-duty door curtain roller or a curtain, the drive device comprising a motor, the motor tail end being provided with a manually switched transmission device, the motor output shaft extending away from one end of the heavy-duty door curtain to form an output connecting shaft passing through the motor tail end, the transmission device comprising a housing, a hand-pulled sprocket, a sprocket shaft, a first compression spring, a second compression spring, a flat key, a thimble shaft and a positioning mechanism, the housing being sleeved on the motor tail end, one end of the sprocket shaft being fixedly connected with the free end of the output connecting shaft of the motor, the hand-pulled sprocket being rotatably sleeved on the sprocket shaft, the other end of the sprocket shaft being rotatably connected with the housing, a key groove for the flat key to be embedded being formed on the side of the hand-pulled sprocket away from the motor, a hollow cavity being formed on the end of the sprocket shaft away from the output connecting shaft, the hollow cavity being open at the end of the sprocket shaft, a slot being formed on the sprocket shaft along the axial direction for the flat key to move in or out of the key groove of the hand-pulled sprocket, the flat key being movably arranged on the slot of the sprocket shaft along the axial direction of the sprocket shaft and passing through the hollow cavity of the sprocket shaft, the first compression spring being arranged between the hollow cavity of the sprocket shaft and the flat key, the side of the flat key facing the first compression spring being provided with a boss embedded in the inner diameter of the first compression spring, one end of the thimble shaft passing into the hollow cavity of the sprocket shaft from the opening of the hollow cavity and abutting against the flat key, the thimble shaft being rotatable and movable in the hollow cavity of the sprocket shaft, the end of the thimble shaft away from the flat key passing out of the opening of the hollow cavity of the sprocket shaft, the free end of the thimble shaft being provided with an end cover larger than the opening of the hollow cavity of the sprocket shaft, the second compression spring being sleeved on the thimble shaft between the opening of the hollow cavity of the sprocket shaft and the end cover of the thimble shaft, the positioning mechanism being arranged on the housing on the side of the end cover of the thimble shaft away from the second compression spring and abutting against the end cover of the thimble shaft or the positioning mechanism pressing the thimble shaft towards the flat key to drive the flat key to be embedded in the key groove of the hand-pulled sprocket.

[0007] Further, the positioning mechanism comprises a bracket, a rotating shaft, a check pressing plate and a pull rod, the bracket being arranged on the housing on the side of the end cover of the thimble shaft away from the second compression spring, the rotating shaft being fixedly arranged on the bracket, the check pressing plate being rotatably arranged on the rotating shaft, the pull rod being fixedly arranged on the check pressing plate, the pull rod driving the check pressing plate to rotate to press the thimble shaft towards the flat key to drive the flat key to be embedded in the key groove of the hand-pulled sprocket and then stopping.

[0008] Further, the check pressing plate is a cuboid, when the check pressing plate is pressed towards the end cover of the thimble shaft along the length direction, the thimble shaft is pressed towards the flat key to drive the flat key to be embedded in the key groove of the hand-pulled sprocket and be limited, when the check pressing plate is reset by the pull rod, the flat key is separated from the key groove of the hand-pulled sprocket under the action of the first compression spring when the check pressing plate abuts against the end cover of the thimble shaft along the width direction.

[0009] Further, the flat key is provided with a groove matched with the hollow cavity end of the chain wheel axle.

[0010] Further, the hollow cavity end of the chain wheel axle is an arc convex matched with the groove of the flat key.

[0011] Further, the hand chain wheel is rotatably sleeved on the chain wheel axle through the first bearing.

[0012] Further, the chain wheel axle is rotatably connected with the shell through the second bearing.

[0013] Further, the output connecting shaft of the motor is further provided with a brake hub.

[0014] Further, the output connecting shaft of the motor is further provided with a cooling fan, and the cooling fan is located between the brake hub and the connecting position of the output connecting shaft and the chain wheel axle.

[0015] The beneficial effects of the present application are as follows: by arranging the manually switchable transmission device at the tail end of the motor of the driving device for driving the heavy-duty door curtain roller or the heavy-duty door curtain unroller, the transmission device is connected with the output connecting shaft of the motor through one end of the sprocket shaft and rotatably connected with the shell arranged at the tail end of the motor through the other end, and the movable flat key is arranged on the sprocket shaft and cooperates with the hand-pulled sprocket, and the flat key is accurately positioned and pushed by the cooperation of the plunger shaft and the first compression spring, the second compression spring and the positioning mechanism, when the heavy-duty door is powered off or the driving device fails to automatically roll or unroll the heavy-duty door curtain, the transmission device can be switched to manual rolling or unrolling, that is, the plunger shaft is pressed inward by operating the positioning mechanism, so that the plunger shaft drives the flat key to move to the key groove of the hand-pulled sprocket until the flat key is embedded in the key groove of the hand-pulled sprocket, that is, the switching to manual rolling or unrolling is completed, at this time, pulling the pull chain of the hand-pulled sprocket makes the pull chain of the hand-pulled sprocket rotate, and the rotation of the pull chain drives the sprocket shaft to rotate, and the output connecting shaft of the motor rotates to drive the roller cross shaft of the heavy-duty door to roll or unroll, when switching to automatic rolling or unrolling of the motor, the plunger shaft end cover is reset by loosening the pressure of the positioning mechanism, at this time, the flat key is pushed outward by the first compression spring to separate from the key groove of the hand-pulled sprocket and completely separate from the hand-pulled sprocket, and the plunger shaft is reset by the second compression spring to make the plunger shaft end cover abut against the positioning mechanism, when the output connecting shaft of the motor rotates automatically, the flat key is separated from the key groove of the hand-pulled sprocket, so that the sprocket shaft rotates and the hand-pulled sprocket does not move, and the plunger shaft and the sprocket shaft are rotatably connected and are not affected, and the sprocket shaft and the shell are rotatably connected and can stably support the sprocket shaft, realizing convenient and rapid automatic and manual switching to control the opening or closing of the heavy-duty rolling shutter door, and the transmission structure is stable and reliable. The positioning mechanism is cooperated with the bracket, the rotating shaft, the check pressure plate and the pull rod, so that it is convenient to operate, and the check pressure plate is in the shape of a cuboid, so that it only needs to be operated by 90° to complete the limiting or resetting, simplifying the operation and being convenient to use, the groove of the flat key and the arc-shaped convex part of the plunger shaft cooperate to make the movement of the flat key more accurate and stable, the first bearing is arranged between the hand-pulled sprocket and the sprocket shaft, and the second bearing is arranged between the sprocket shaft and the shell, so that the rotating and supporting structure is more stable and reliable, and the present application can be widely applied. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a structural schematic diagram of an embodiment of the present application; Figure 2 is a structural schematic diagram of the transmission device in an automatic state of an embodiment of the present application; Figure 3 is a structural schematic diagram of the transmission device in a manual state of an embodiment of the present application; Figure 4is a partial structural schematic diagram of a hand sprocket in the embodiment of the present application.

[0017] In the figure, 1. motor, 2. transmission device, 3. first bearing, 4. second bearing, 5. brake hub, 6. cooling fan, 11. output shaft, 21. housing, 22. hand sprocket, 23. sprocket axle, 24. first compression spring, 25. second compression spring, 26. flat key, 27. thimble axle, 28. adjustment mechanism, 111 output connecting shaft, 221. keyway, 231. slotted, 261. boss, 271. end cover, 281. bracket, 282. rotating shaft, 283. non-return pressing plate, 284. pull rod. DETAILED DESCRIPTION

[0018] The present application will be further described in conjunction with the drawings and specific embodiments.

[0019] Reference Figures 1-4The preferred embodiment of the present invention, a transmission device for heavy-duty doors that can be automatically and manually switched, includes a drive device for driving the heavy-duty door curtain to roll up or lower. The drive device includes a motor 1, and a manual switching transmission device 2 is provided at the tail end of the motor 1. The output shaft 11 of the motor 1 extends away from the end of the heavy-duty door curtain to form an output connecting shaft 111 passing through the tail end of the motor 1. The transmission device 2 includes a housing 21, a hand-operated chain wheel 22, a chain wheel shaft 23, a first compression spring 24, a second compression spring 25, a flat key 26, a pin shaft 27, and an adjustment mechanism 28. The housing 21 is sleeved on the tail end of the motor 1, and one end of the chain wheel shaft 23 is connected to the output connecting shaft of the motor 1. 111 is fixedly connected at its free end. The hand zipper wheel 22 includes a zipper wheel and a zipper sleeved on the zipper wheel. The zipper wheel of the hand zipper wheel 22 is rotatably sleeved on the sprocket shaft 23 via a first bearing 3. The other end of the sprocket shaft 23 is rotatably connected to the outer casing 21 via a second bearing 4. The side of the hand zipper wheel 22 away from the motor 1 has a keyway 221 for a flat key 26 to be embedded in. The end of the sprocket shaft 23 away from the output connecting shaft 111 has a hollow cavity, and the hollow cavity is located at the end of the sprocket shaft 23 with the hollow cavity opening. The section of the sprocket shaft 23 with the hollow cavity has an axially formed keyway 221 for a flat key 26 to be moved and embedded in the hand zipper wheel 22. 21 or disengaging from the slot 231 of the keyway 221 of the hand-operated sprocket 22, the flat key 26 is axially movable along the sprocket shaft 23 and passes through the slot 231 of the sprocket shaft 23 and through the hollow cavity of the sprocket shaft 23. The first compression spring 24 passes between the inner end of the hollow cavity of the sprocket shaft 23 and the flat key 26. The flat key 26 has a boss 261 on the side facing the first compression spring 24 that is embedded in the inner diameter of the first compression spring 24. One end of the ejector pin shaft 27 passes through the opening of the hollow cavity of the sprocket shaft 23 and abuts against the flat key 26. The ejector pin shaft 27 is rotatable via a third bearing and can move axially within the hollow cavity of the sprocket shaft 23. Within the hollow cavity of the sprocket shaft 23, the end of the ejector pin 27 away from the flat key 26 extends out of the opening of the hollow cavity of the sprocket shaft 23, and the free end of the ejector pin 27 is provided with an end cap 271 larger than the opening of the hollow cavity of the sprocket shaft 23. The second compression spring sleeve 25 is provided on the ejector pin 27 between the opening of the hollow cavity of the sprocket shaft 23 and the end cap 271 of the ejector pin 27. The adjusting mechanism 28 is provided on the housing 21 on the side of the end cap 271 of the ejector pin 27 away from the side where the second compression spring 25 is located, abutting against the end cap 271 of the ejector pin 27, or the adjusting mechanism 28 presses the ejector pin 27 against the flat key 26, causing the flat key 26 to be embedded in the keyway 221 of the hand-operated sprocket 22.

[0020] The position adjusting mechanism 28 comprises a support 281, a rotating shaft 282, a check pressing plate 283 and a pull rod 284. The support 281 is arranged on the shell 21 at the side of the end cover 271 of the ejector shaft 27 away from the second compression spring 25. The rotating shaft 282 is fixedly arranged on the support 281. The check pressing plate 283 is a cuboid. The check pressing plate 283 is rotatably sleeved on the rotating shaft 282. The pull rod 284 is fixedly arranged on the check pressing plate 283. The pull rod 284 pulls the check pressing plate 283 to rotate and drive the check pressing plate 283 to press the ejector shaft 27 towards the flat key 26, thereby driving the flat key 26 to be embedded in the key groove 221 of the hand-operated chain wheel 22 and then stop. When the check pressing plate 283 is pressed towards the end cover 271 of the ejector shaft 27 in the length direction, the ejector shaft 27 is pressed towards the flat key 26, thereby driving the flat key 26 to be embedded in the key groove 221 of the hand-operated chain wheel 22 and then be limited. When the check pressing plate 283 is reset by the pull rod 284 and is abutted against the end cover 271 of the ejector shaft 27 in the width direction, the flat key 26 is separated from the key groove 221 of the hand-operated chain wheel 22 under the action of the first compression spring 24, and the ejector shaft 27 is moved outward and reset under the action of the second compression spring 25 and is abutted against the check pressing plate 283 in the width direction.

[0021] The drive device of the heavy-duty door curtain is a prior art component, and a brake hub 5 can be further arranged on the output connecting shaft 111 of the motor 1 to automatically brake at a position when the automatic curtain is rolled or unrolled. A heat dissipation fan 6 is arranged on the output connecting shaft 111 of the motor 1, and the heat dissipation fan 6 is arranged between the brake hub 5 and the connecting position of the output connecting shaft 111 and the chain wheel shaft 23.

[0022] The shape of the flat key in the above embodiment can also be two cross-shaped keys or other shapes, and a matching key groove is arranged at a corresponding position of the hand-operated chain wheel. A groove matched with the end part of the ejector shaft in the hollow cavity of the chain wheel shaft can be arranged at the position of the flat key towards the ejector shaft, and the end part of the ejector shaft in the hollow cavity of the chain wheel shaft is an arc-shaped convex part matched with the groove of the flat key. The cooperation of the arc-shaped convex part of the ejector shaft and the groove of the flat key makes the positioning of the flat key more accurate and the operation more stable when the flat key is embedded in or separated from the key groove of the hand-operated chain wheel. The position adjusting mechanism can also adopt other mechanisms which can abut against the end cover of the ejector shaft and apply pressure to the ejector shaft to press the ejector shaft into the chain wheel shaft and drive the flat key to move and be embedded in the key groove of the hand-operated chain wheel. The check pressing plate is arranged in a cuboid shape for the convenience of use. For example, the position adjusting mechanism can also adopt a spring limit switch handle to adjust the position of the ejector shaft.

[0023] Although the present application is specifically shown and described with reference to the preferred embodiments, those skilled in the art should understand that various changes in form and details can be made to the present application without departing from the spirit and scope of the present application defined in the appended claims.

Claims

1. A transmission device for heavy-duty doors that can be switched between automatic and manual operation, comprising a drive device for driving the heavy-duty door curtain to roll up or lower, said drive device comprising an electric motor, characterized in that: The motor is equipped with a manually switchable transmission device at its tail end. The motor's output axis extends axially away from the heavy-duty door curtain, forming an output connecting shaft that passes through the motor's tail end. The transmission device includes a housing, a hand-operated chain wheel, a chain wheel shaft, a first compression spring, a second compression spring, a flat key, a pin shaft, and an adjustment mechanism. The housing is fitted onto the motor's tail end. One end of the chain wheel shaft is fixedly connected to the free end of the motor's output connecting shaft. The hand-operated chain wheel is rotatably fitted onto the chain wheel shaft, and the other end of the chain wheel shaft is rotatably connected to the housing. A keyway for the flat key to be embedded is provided on the side of the hand-operated chain wheel away from the motor. A hollow cavity is provided on the end of the chain wheel shaft away from the output connecting shaft, with the hollow cavity opening at the end of the chain wheel shaft. A slot is provided axially along the section of the chain wheel shaft with the hollow cavity, allowing the flat key to move and embed into or disengage from the keyway. The flat key can move axially along the chain wheel shaft. A key is movably inserted into the slot of the sprocket shaft, and a flat key passes through the hollow cavity of the sprocket shaft. The first compression spring is inserted between the inner end of the hollow cavity of the sprocket shaft and the flat key. The side of the flat key facing the first compression spring has a boss that is embedded in the inner diameter of the first compression spring. One end of the ejector pin shaft passes through the opening of the hollow cavity of the sprocket shaft and abuts against the flat key. The ejector pin shaft is rotatable and can move axially within the hollow cavity of the sprocket shaft. The end of the ejector pin shaft away from the flat key passes through the hollow cavity opening of the sprocket shaft, and the free end of the ejector pin shaft is provided with an end cap larger than the hollow cavity opening of the sprocket shaft. The second compression spring is sleeved on the ejector pin shaft and located between the hollow cavity opening of the sprocket shaft and the end cap of the ejector pin shaft. The adjusting mechanism is provided on the outer shell and located on the side of the end cap of the ejector pin shaft away from the side where the second compression spring is located. It abuts against the end cap of the ejector pin shaft or the adjusting mechanism presses the ejector pin shaft toward the flat key, causing the flat key to be embedded in the keyway of the hand-operated sprocket.

2. The transmission device for heavy-duty doors that can be automatically or manually switched according to claim 1, characterized in that: The adjustment mechanism includes a bracket, a rotating shaft, a check plate, and a pull rod. The bracket is located on the outer casing on the side of the end cap of the ejector pin shaft away from the second compression spring. The rotating shaft is fixed to the bracket. The check plate is rotatably mounted on the rotating shaft. The pull rod is fixed to the check plate. The pull rod pulls the check plate to rotate, causing the check plate to press the ejector pin shaft against the flat key, thereby causing the flat key to be embedded in the keyway of the hand-operated chain wheel and stop.

3. The transmission device for heavy-duty doors that can be automatically or manually switched according to claim 2, characterized in that: The check plate is rectangular. When the check plate presses against the end cap of the ejector shaft along its length, it causes the ejector shaft to press against the flat key, which in turn causes the flat key to be embedded in the keyway of the hand chain wheel and limited. When the check plate is reset by the pull rod, it abuts against the end cap of the ejector shaft along its width. Under the action of the first compression spring, the flat key disengages from the keyway of the hand chain wheel.

4. The transmission device for heavy-duty doors that can be automatically or manually switched according to claim 1, characterized in that: The flat key has a groove at the position facing the ejector pin shaft that matches the end of the ejector pin shaft located in the hollow cavity of the sprocket shaft.

5. The transmission device for heavy-duty doors that can be automatically or manually switched according to claim 4, characterized in that: The pin shaft is located at the inner end of the hollow cavity of the sprocket shaft, which is an arc-shaped protrusion that matches the groove of the flat key.

6. The transmission device for heavy-duty doors that can be automatically or manually switched according to claim 1, characterized in that: The hand-operated sprocket is rotatably mounted on the sprocket shaft via a first bearing.

7. The transmission device for heavy-duty doors that can be automatically or manually switched according to claim 1, characterized in that: The sprocket shaft is rotatably connected to the housing via a second bearing.

8. The transmission device for heavy-duty doors that can be automatically or manually switched according to claim 1, characterized in that: The output shaft of the electric motor is also equipped with a brake hub.

9. The transmission device for heavy-duty doors that can be automatically or manually switched according to claim 8, characterized in that: The output shaft of the electric motor is also equipped with a cooling fan, which is located between the brake hub and the connection between the output shaft and the sprocket shaft.

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