Emergency manual and variable frequency speed regulation curtain pulling machine

Abstract

The utility model provides a kind of big curtain curtain machine of emergency manual and variable frequency speed regulation, belong to stage equipment technical field, including cabinet, the inside installation of cabinet has, for providing variable frequency speed regulation electric power;Transmission control unit, input end connects power unit to control electric power on-off;Speed reduction transmission unit, input end connects transmission control unit, realizes power speed reduction and increases torque by orthogonal gear engagement;Chain transmission unit, driving part connects speed reduction transmission unit to transmit power;Manual emergency unit, power output end connects chain transmission unit driving part, can provide manual power when electric failure, and break reverse power transmission under electric mode.The utility model can realize speed adjustment by variable frequency motor and governor to adapt the diversification needs of complex scene such as stage performance, movie projection, simultaneously have effective manual emergency operation function to deal with power supply interruption, electric motor failure and other emergency situations.

Description

Technical Field

[0001] This utility model relates to the field of stage equipment technology, and in particular to a large curtain pulling machine that can be manually operated in emergencies and has variable frequency speed regulation. Background Technology

[0002] Curtain pulling machines are widely used in stage performances, film screenings, and other scenarios to electrically control the opening and closing of curtains. Traditional curtain pulling machines mainly use fixed-speed motors, which, while meeting basic functional requirements, cannot adjust the speed according to actual needs. Especially in special circumstances, such as power outages, they cannot be switched to manual operation mode in an emergency, posing certain safety hazards. To improve the flexibility and reliability of curtain pulling machines, variable frequency speed control curtain pulling machines have emerged on the market. These machines incorporate variable frequency motors and speed controllers, allowing the motor to adjust its speed according to different application scenarios, improving the responsiveness and applicability of the equipment. However, existing variable frequency speed control curtain pulling machines still lack effective manual operation methods in the event of motor failure or other emergencies, resulting in a lack of timely response in emergency situations and certain functional limitations.

[0003] Furthermore, most existing curtain-pulling machines on the market offer only a single speed mode, which cannot meet the diverse needs of complex scenarios. They typically only provide fixed speed control options and cannot adapt to different performance rhythms or specific curtain opening and closing requirements.

[0004] Therefore, there is an urgent need for a large curtain pulling machine that can be manually operated in emergencies and has variable frequency speed control. This machine can not only solve the problems mentioned above in actual operation, but also improve the overall performance and safety reliability of the equipment, which is of great significance for improving the efficiency of opening and closing the curtain. Utility Model Content

[0005] To overcome the shortcomings of existing technologies, the purpose of this utility model is to provide a large curtain pulling machine that can be manually operated in emergencies and has variable frequency speed control. It can adjust the speed through a variable frequency motor and speed controller to adapt to the diverse needs of complex scenarios such as stage performances and movie screenings. At the same time, it has an effective manual emergency operation function to deal with emergencies such as power supply interruption and motor failure. This solves the problems of traditional fixed-speed curtain pulling machines that cannot be speed-adjusted and lack emergency manual operation, as well as the lack of effective emergency manual means in existing variable frequency curtain pulling machines. It improves the flexibility, safety and reliability of the large curtain pulling machine and the efficiency of opening and closing the curtain.

[0006] To achieve the above objectives, this utility model provides the following solution: A large curtain pulling machine with emergency manual operation and variable frequency speed control includes a cabinet, inside which is installed a power unit for providing variable frequency speed-controlled electric power; a transmission control unit, whose input end is connected to the output end of the power unit, for controlling the on / off of electric power; a reduction transmission unit, whose input end is connected to the output end of the transmission control unit, for achieving power reduction and torque increase through orthogonal gear meshing; a chain drive unit, whose driving component is connected to the output end of the reduction transmission unit, for transmitting power; and a manual emergency unit, whose power output end is connected to the driving component of the chain drive unit, for providing manual power in case of electric failure and blocking reverse power transmission in electric mode.

[0007] Preferably, the power unit includes a variable frequency motor and a variable frequency speed controller. The variable frequency motor is fixedly installed on the inner wall of the cabinet, and the variable frequency speed controller is installed on the variable frequency motor to adjust the output speed of the variable frequency motor. The output end of the variable frequency motor is connected to a transmission control unit for outputting electric power.

[0008] Preferably, the transmission control unit includes an electromagnetic clutch, the input end of which is connected to a first transmission shaft, the other end of which is connected to the output end of the variable frequency motor, and the output end of the electromagnetic clutch is connected to a second transmission shaft, which is used to transmit the electric power controlled by the on / off state of the electromagnetic clutch to the reduction transmission unit.

[0009] Preferably, the reduction transmission unit includes a reduction gearbox fixed inside the cabinet. The end of the second transmission shaft away from the electromagnetic clutch passes through the reduction gearbox, and the end of the second transmission shaft is connected to a first bevel gear. The bottom of the first bevel gear is meshed with a third bevel gear, and the end of the third bevel gear away from the meshing point of the first bevel gear is meshed with a second bevel gear. Through the orthogonal meshing of the first bevel gear, the third bevel gear, and the second bevel gear, the functions of power steering conversion and the variable frequency motor driving the curtain to close in the forward direction and driving the curtain to open in the reverse direction are realized.

[0010] Preferably, the first bevel gear and the second bevel gear are perpendicular to the third bevel gear, the first bevel gear and the second bevel gear are arranged parallel to each other, and the first bevel gear, the second bevel gear and the third bevel gear are all orthogonal bevel gears, and the axis lines of the three are in the same vertical plane. Through meshing transmission, the power is reduced and torque is increased and the 90° steering conversion is achieved.

[0011] Preferably, a bearing base is provided at the bottom of the third bevel gear, and the bearing base is installed on the inner side of the bottom of the gearbox; the output end of the second bevel gear is connected to a third drive shaft, and the other end of the third drive shaft passes through the gearbox, serving as the output end of the speed reduction transmission unit and connected to the active component of the chain drive unit.

[0012] Preferably, the active component of the chain drive unit includes an active sprocket, which is connected to the end of the third drive shaft away from the second bevel gear and the manual emergency unit via keys. A driven sprocket is provided on the top of the active sprocket, which is installed on the inner side of the top of the cabinet, and the active sprocket and the driven sprocket are connected by a drive chain. The output end of the driven sprocket is fixedly connected to the curtain drive shaft. A through hole is provided on the side wall of the cabinet, and the curtain drive shaft extends through the through hole to the outside of the cabinet to drive the curtain to achieve opening and closing actions.

[0013] Preferably, the manual emergency unit includes a fourth drive shaft and a manual wheel. One end of the fourth drive shaft is connected to the drive sprocket via a key, and the other end of the fourth drive shaft passes through the cabinet and is connected to the manual wheel. A one-way bearing is provided between the fourth drive shaft and the manual wheel. The one-way bearing is fixed to the inner side of the cabinet side wall to allow the power of the manual wheel to be transmitted to the drive sprocket via the fourth drive shaft, and to block the reverse power transmission from the drive sprocket to the fourth drive shaft and the manual wheel in electric mode, thereby preventing the manual wheel from moving.

[0014] Preferably, a control panel is fixedly installed on the top outer wall of the cabinet. The control panel is electrically connected to the variable frequency motor, the variable frequency speed controller and the electromagnetic clutch respectively, and is used to control the start and stop of the variable frequency motor, the speed adjustment of the variable frequency speed controller and the on and off state of the electromagnetic clutch.

[0015] Preferably, the front of the cabinet is provided with a door structure, which is a sliding door. One side of the sliding door is rotatably connected to the side wall of the cabinet by a hinge, and the other side is snapped into the cabinet by a buckle, which is used to facilitate the inspection and maintenance of the power unit, transmission control unit and reduction transmission unit inside the cabinet.

[0016] According to the specific embodiments provided by this utility model, the following technical effects are disclosed: (1) This utility model integrates the variable frequency motor and variable frequency speed controller in the power unit, and combines the control of the on and off of electric power by the electromagnetic clutch in the transmission control unit. It can not only flexibly adjust the output speed of the variable frequency motor through the variable frequency speed controller to adapt to the speed requirements of curtain opening and closing in different scenarios such as stage performances and movie screenings, but also quickly cut off or connect the electric power through the electromagnetic clutch. This solves the problems of traditional fixed speed curtain pullers being unable to adjust speed and the insufficient power control stability of existing variable frequency curtain pullers, and significantly improves the speed adjustment flexibility and power control reliability of the curtain puller.

[0017] (2) By setting a one-way bearing in the manual emergency unit, and cooperating with the key connection structure between the fourth drive shaft and the active sprocket of the chain drive unit, this utility model can block the reverse power transmission from the active sprocket to the fourth drive shaft and the manual wheel in electric mode, thus avoiding the safety hazards caused by the manual wheel following. In the event of power failure, motor failure, or other electric failure scenarios, the manual wheel can transmit power directly to the active sprocket through the fourth drive shaft, thus solving the problem of the lack of emergency manual means or cumbersome operation of existing curtain pullers, and effectively ensuring the timeliness of curtain opening and closing and the safety of operation in emergency situations.

[0018] (3) This utility model achieves efficient power reduction and torque increase by connecting the first bevel gear, the second bevel gear and the third bevel gear in the reduction transmission unit through orthogonal meshing, combined with the support of the bearing base at the bottom of the third bevel gear. It can also complete the 90° turning conversion to adapt to the internal space layout of the cabinet and reduce energy loss in the power transmission process. At the same time, the sliding door structure on the front of the cabinet facilitates the maintenance of internal power unit, reduction transmission unit and other components. The control panel on the top can centrally control the motor start and stop, speed adjustment and clutch on and off, which solves the problems of low transmission efficiency and inconvenient maintenance and operation of the existing curtain machine, and further improves the operating efficiency and ease of use of the curtain machine. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of a large curtain pulling machine that can be manually operated in emergencies and has variable frequency speed regulation according to this utility model; Figure 2 This is a schematic diagram of the internal structure provided for an embodiment of the present utility model; Figure 3 A schematic diagram of the planar structure of the driving sprocket and the driven sprocket provided in an embodiment of this utility model; Figure 4 This is a schematic diagram of the orthogonal bevel gear meshing structure provided in this utility model embodiment.

[0021] Explanation of reference numerals in the attached figures: 1. Cabinet; 2. Control panel; 3. Variable frequency motor; 4. Variable frequency speed controller; 5. First drive shaft; 6. Electromagnetic clutch; 7. Gearbox; 8. Second drive shaft; 9. First bevel gear; 10. Second bevel gear; 11. Third drive shaft; 12. Drive sprocket; 13. Driven sprocket; 14. Drive chain; 15. Fourth drive shaft; 16. One-way bearing; 17. Manual wheel; 18. Through hole; 19. Curtain drive shaft; 20. Sliding door; 21. Third bevel gear; 22. Bearing base. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Example like Figure 1 As shown, this utility model provides a large curtain pulling machine that can be manually operated in emergencies and has variable frequency speed regulation. The cabinet 1 serves as the installation and support carrier for all functional units. The control panel 2 is fixed to the top outer wall of the cabinet 1 by bolts. The control panel 2 is electrically connected to the variable frequency motor 3, variable frequency speed controller 4, and electromagnetic clutch 6 of the transmission control unit of the subsequent power unit through wires. Through integrated control command output, the start and stop of the variable frequency motor 3, the speed regulation of the variable frequency speed controller 4, and the on and off switching of the electromagnetic clutch 6 are realized, providing the control basis for the overall operation of the curtain pulling machine. In addition, the front of the cabinet 1 is equipped with a sliding door 20. One side of the sliding door 20 is rotatably connected to the side wall of the cabinet 1 via a hinge, and the other side is snapped into the cabinet 1 via a buckle. This provides a large enough operating space when the curtain machine needs maintenance, making it convenient for maintenance personnel to disassemble and troubleshoot the power unit, transmission control unit, and reduction transmission unit inside the cabinet 1. The side wall of the cabinet 1 has two through holes 18. One is for the curtain drive shaft 19 of the chain drive unit to pass through, and the other is for the fourth drive shaft 15 of the manual emergency unit to pass through. At the same time, the inner wall of the through hole 18 can also be fitted with a rubber sealing ring, which not only avoids rigid friction between the drive shaft and the side wall of the cabinet 1 when the drive shaft rotates, but also prevents external dust from entering the interior of the cabinet 1 and affecting the operation of the components.

[0025] It should be noted that the power unit, transmission control unit, reduction transmission unit, and chain drive unit are arranged horizontally inside the cabinet 1. The manual emergency unit is connected to one side of the chain drive unit. The units are connected to each other through a drive shaft or meshing structure to form a continuous power transmission link, which can shorten the power transmission path, reduce energy loss, and avoid interference between the units during movement.

[0026] like Figure 2 As shown, the power unit includes a variable frequency motor 3 and a variable frequency speed controller 4. The variable frequency motor 3 is fixed to the inner wall of the cabinet 1 by expansion bolts. The fixing position must ensure that its output shaft is collinear with the axis of the first transmission shaft 5 of the subsequent transmission control unit to avoid radial offset during power transmission. The variable frequency speed controller 4 is bolted to the top of the housing of the variable frequency motor 3, rather than being installed separately. This shortens the transmission distance of the speed control signal, reduces the interference of the electromagnetic environment inside the cabinet 1 on the speed control signal, and ensures that the output speed of the variable frequency motor 3 can accurately follow the instructions of the variable frequency speed controller 4, such as smoothly increasing from a standstill to the set speed, or smoothly decreasing from high speed to low speed. If it were installed separately, it would easily cause delay or fluctuation in the speed control signal, which would not meet the requirements of the stage scene for the stability of the curtain opening and closing speed. The output shaft end of the variable frequency motor 3 is machined with a keyway, which is fixedly connected to one end of the first transmission shaft 5 by a flat key, so that the electric power generated by the variable frequency motor 3 is transmitted to the transmission control unit without slippage, providing an adjustable speed power source for the curtain pulling machine.

[0027] The transmission control unit includes an electromagnetic clutch 6. The input end of the electromagnetic clutch 6 is fixedly connected to the other end of the first transmission shaft 5 via a key, and the output end is also fixedly connected to one end of the second transmission shaft 8 via a key. The axis of the electromagnetic clutch 6 is collinear with the axes of the first transmission shaft 5 and the second transmission shaft 8, ensuring smooth power transmission between the first transmission shaft 5, the electromagnetic clutch 6, and the second transmission shaft 8, avoiding power loss or component wear due to axis misalignment. The electromagnetic clutch 6 is electrically connected to the control panel 2 on the top of the cabinet 1 via a wire, allowing for the on / off control of electric power according to the instructions on the control panel 2. Specifically, when the equipment is in electric mode, the electromagnetic clutch 6 is energized and engaged, transmitting the electric power from the first transmission shaft 5 to the second transmission shaft 8. When the equipment switches to manual emergency mode, the electromagnetic clutch 6 is de-energized and disengaged, cutting off the electric power transmission path and preventing manual power from being transmitted back to the frequency converter motor 3, causing component damage.

[0028] The reduction gear unit includes a reduction gearbox 7, a first bevel gear 9, a second bevel gear 10, a third bevel gear 21, and a third drive shaft 11. The reduction gearbox 7 is bolted to a mounting base inside the cabinet 1. The mounting base must ensure the reduction gearbox 7 is level to prevent additional load from the gearbox due to tilting during internal bevel gear meshing. The end of the second drive shaft 8 away from the electromagnetic clutch 6 penetrates the side wall of the reduction gearbox 7. The penetration point can be sealed with a sealing ring to prevent grease leakage and external dust ingress. The end of the second drive shaft 8 inside the reduction gearbox 7 is fixedly connected to the first bevel gear 9 via a flat key. Figure 4 As shown, the teeth of the first bevel gear 9 mesh with the top teeth of the third bevel gear 21, and the bottom teeth of the third bevel gear 21 mesh with the teeth of the second bevel gear 10. The first bevel gear 9 and the second bevel gear 10 are perpendicular to the third bevel gear 21, and their axes lie in the same vertical plane. This orthogonal meshing structure serves two key functions: Power steering conversion and curtain movement linkage control: Through the meshing transmission relationship between the first bevel gear 9, the third bevel gear 21 and the second bevel gear 10, a corresponding control of the direction of the variable frequency motor 3 and the movement of the curtain is established. When the variable frequency motor 3 rotates forward, the power is transmitted to the first bevel gear 9 through the first drive shaft 5, the electromagnetic clutch 6 and the second drive shaft 8. The first bevel gear 9 drives the third bevel gear 21 to rotate in reverse, and the third bevel gear 21 drives the second bevel gear 10 to rotate forward. The second bevel gear 10 drives the third drive shaft 11 to rotate in the forward direction, and then drives the curtain drive shaft 19 to rotate through the chain drive unit, thereby realizing the curtain closing. When the variable frequency motor 3 rotates in reverse, the direction of each bevel gear is synchronously reversed, the third drive shaft 11 rotates in reverse, and finally drives the curtain to open. This realizes the function of the variable frequency motor 3 closing the curtain when rotating forward and opening the curtain when rotating in reverse, ensuring that the curtain movement matches the motor control command.

[0029] The lateral path of the power transmission is adjusted to match the layout of cabinet 1: the second drive shaft 8 transmits power along the length of cabinet 1. After the above-mentioned bevel gears mesh orthogonally, the third drive shaft 11 transmits power along the width of cabinet 1. Only the lateral path of power transmission is changed, rather than the horizontal transmission property of power. This path adjustment can avoid the power unit, electromagnetic clutch 6 and other components arranged along the length of cabinet 1, avoid spatial interference between the transmission components during the movement, and make the installation position of the subsequent chain drive unit more in line with the needs of the curtain drive shaft 19 at the top of cabinet 1, maximize the use of the internal space of cabinet 1 and adapt to the overall layout.

[0030] In addition, the center hole of the third bevel gear 21 is connected to the bearing base 22 through a bearing. The bearing base 22 is fixed to the bottom inner side of the gearbox 7 by bolts. The function of the bearing base 22 is to position the third bevel gear 21 axially and radially, ensuring that the meshing clearance between the third bevel gear 21 and the first bevel gear 9 and the second bevel gear 10 is kept within a reasonable range of 0.1-0.3mm, so as to avoid poor meshing of the gear teeth due to the shaking of the third bevel gear 21, which could lead to transmission jamming or excessive wear of the tooth surface. The center hole of the second bevel gear 10 is fixedly connected to one end of the third drive shaft 11 through a flat key. The other end of the third drive shaft 11 passes through the other side wall of the gearbox 7, transmitting the power after reduction, torque amplification and steering conversion to the chain drive unit as the power output end of the reduction transmission unit.

[0031] like Figure 3 As shown, the driving component of the chain drive unit is the driving sprocket 12. The center hole of the driving sprocket 12 is machined with a double keyway. The double keyway is fixedly connected to the end of the third drive shaft 11 away from the second bevel gear 10 and the end of the fourth drive shaft 15, respectively. It can simultaneously receive the electric power transmitted by the reduction drive unit and the manual power transmitted by the manual emergency unit, and ensure that the two powers can drive the driving sprocket 12 to rotate synchronously, avoiding damage to the keyway due to excessive torque when connected by a single keyway. A driven sprocket 13 is set directly above the driving sprocket 12. It is connected by a drive chain 14, which transmits the rotational power of the driving sprocket 12 to the driven sprocket 13. The center hole of the driven sprocket 13 is fixedly connected to one end of the curtain drive shaft 19 through a flat key. The other end of the curtain drive shaft 19 extends through the through hole 18 on the side wall of the cabinet 1 to the outside of the cabinet 1. The extended end is fixedly connected to the drive roller of the stage curtain, which transmits the rotational power of the driven sprocket 13 to the drive roller, ultimately realizing the opening and closing of the curtain.

[0032] The manual emergency unit includes a fourth drive shaft 15, a one-way bearing 16, and a manual wheel 17. One end of the fourth drive shaft 15 is connected to the drive sprocket 12 via a double key, and the other end passes sequentially through the inner ring of the one-way bearing 16 and the side wall of the cabinet 1, before being fixedly connected to the center of the manual wheel 17 by bolts. The outer ring of the one-way bearing 16 is fixed to the inner side of the side wall of the cabinet 1 by bolts, thereby positioning the one-way bearing 16 and ensuring that it can transmit power only in one direction.

[0033] The function of the one-way bearing 16 is to achieve one-way isolation and transmission of power: When the equipment is in electric mode, the rotation direction of the fourth drive shaft 15 driven by the drive sprocket 12 is opposite to the free rotation direction of the one-way bearing 16. The inner and outer rings of the one-way bearing 16 are locked, blocking the reverse power transmission from the drive sprocket 12 to the fourth drive shaft 15 and the manual wheel 17, keeping the manual wheel 17 stationary and preventing the operator from accidentally touching the rotating manual wheel 17 and causing a safety accident. When the equipment enters an electric failure state due to power interruption, failure of the frequency converter motor 3, etc., the operator rotates the manual wheel 17. The rotation direction of the fourth drive shaft 15 driven by the manual wheel 17 is consistent with the free rotation direction of the one-way bearing 16. The inner ring of the one-way bearing 16 rotates synchronously with the fourth drive shaft 15, transmitting manual power to the drive sprocket 12, and then driving the curtain drive shaft 19 to rotate through the chain drive unit to realize the emergency opening and closing of the curtain.

[0034] Working Principle: This curtain-pulling machine includes electric and manual modes. In normal operation (electric mode), the curtain opening / closing speed command is input via the control panel 2. The variable frequency drive 4 receives the command and adjusts the output speed of the variable frequency motor 3, causing the motor 3 to start and generate electric power. This power is transmitted to the electromagnetic clutch 6 via the first drive shaft 5. The control panel 2 energizes the electromagnetic clutch 6, engaging it. Power is then transmitted via the second drive shaft 8 to the first bevel gear 9 inside the reduction gearbox 7. The first bevel gear 9 meshes and drives the third bevel gear 21 to rotate. The third bevel gear 21 then... The meshing drive of the second bevel gear 10 rotates, realizing the reduction and torque increase of the power and the conversion of the direction; the second bevel gear 10 drives the third transmission shaft 11 to rotate, transmitting the power to the drive sprocket 12; the drive sprocket 12 drives the driven sprocket 13 to rotate through the transmission chain 14, the driven sprocket 13 drives the curtain drive shaft 19 to rotate, the curtain drive shaft 19 drives the stage curtain drive roller to rotate, and finally realizes the curtain opening and closing at a set speed; during this process, the one-way bearing 16 blocks the reverse power of the drive sprocket 12 to the fourth transmission shaft 15 and the manual wheel 17, and the manual wheel 17 remains stationary.

[0035] When power is interrupted or the variable frequency motor 3 fails, the electromagnetic clutch 6 automatically disengages due to power failure, cutting off the electric power transmission path. The operator holds the manual wheel 17 and rotates it in the set direction. The manual power is transmitted to the one-way bearing 16 via the fourth drive shaft 15. Since the manual rotation direction is consistent with the free rotation direction of the one-way bearing 16, the one-way bearing 16 unlocks and allows power to be transmitted to the drive sprocket 12. After the drive sprocket 12 rotates, it drives the driven sprocket 13 to rotate through the transmission chain 14. The driven sprocket 13 drives the curtain drive shaft 19 to rotate, which in turn drives the curtain drive roller to rotate, realizing the emergency opening and closing of the curtain and ensuring that the stage performance process is not affected by the failure of the curtain machine.

[0036] Therefore, the aforementioned emergency manual and variable frequency speed-regulating curtain puller can adjust the speed through a variable frequency motor and speed controller to adapt to the diverse needs of complex scenarios such as stage performances and movie screenings. At the same time, it has an effective manual emergency operation function to deal with emergencies such as power supply interruption and motor failure. This solves the problems of traditional fixed-speed curtain pullers being unable to adjust speed and lacking emergency manual operation, as well as the lack of effective emergency manual means in existing variable frequency curtain pullers. It improves the flexibility, safety and reliability of the curtain puller and the efficiency of opening and closing the curtain.

[0037] This document uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. Furthermore, those skilled in the art will recognize that, based on the ideas of this utility model, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A large curtain pulling machine that can be manually operated in emergencies and has variable frequency speed control, characterized in that, The device includes a cabinet, inside which is installed a power unit for providing variable frequency speed-controlled electric power; a transmission control unit, whose input end is connected to the output end of the power unit, for controlling the on / off state of the electric power; a reduction transmission unit, whose input end is connected to the output end of the transmission control unit, for achieving power reduction and torque increase through orthogonal gear meshing; a chain drive unit, whose driving component is connected to the output end of the reduction transmission unit, for transmitting power; and a manual emergency unit, whose power output end is connected to the driving component of the chain drive unit, for providing manual power in case of electric failure and blocking reverse power transmission in electric mode.

2. The emergency manual and frequency-controlled curtain pulling machine according to claim 1, characterized in that, The power unit includes a variable frequency motor and a variable frequency speed controller. The variable frequency motor is fixedly installed on the inner wall of the cabinet. The variable frequency speed controller is installed on the variable frequency motor and is used to adjust the output speed of the variable frequency motor. The output end of the variable frequency motor is connected to a transmission control unit for outputting electric power.

3. A large curtain pulling machine with emergency manual operation and variable frequency speed control as described in claim 2, characterized in that, The transmission control unit includes an electromagnetic clutch. The input end of the electromagnetic clutch is connected to a first drive shaft, and the other end of the first drive shaft is connected to the output end of the variable frequency motor. The output end of the electromagnetic clutch is connected to a second drive shaft, which is used to transmit the electric power after the electromagnetic clutch is controlled to the reduction transmission unit.

4. A large curtain pulling machine with emergency manual operation and variable frequency speed control as described in claim 3, characterized in that, The reduction transmission unit includes a reduction gearbox fixed inside the cabinet. The end of the second transmission shaft away from the electromagnetic clutch passes through the reduction gearbox, and the end of the second transmission shaft is connected to a first bevel gear. The bottom of the first bevel gear is meshed with a third bevel gear, and the end of the third bevel gear away from the meshing point of the first bevel gear is meshed with a second bevel gear. Through the orthogonal meshing of the first bevel gear, the third bevel gear, and the second bevel gear, the functions of power steering conversion and the variable frequency motor driving the curtain to close in the forward direction and driving the curtain to open in the reverse direction are realized.

5. A large curtain pulling machine with emergency manual operation and variable frequency speed control as described in claim 4, characterized in that, The first bevel gear and the second bevel gear are perpendicular to the third bevel gear, and the first bevel gear and the second bevel gear are arranged parallel to each other. The first bevel gear, the second bevel gear and the third bevel gear are all orthogonal bevel gears, and their axis lines are all in the same vertical plane. Through meshing transmission, the power is reduced in speed and torque is increased, and the 90° steering conversion is achieved.

6. A large curtain pulling machine with emergency manual operation and variable frequency speed control as described in claim 5, characterized in that, The bottom of the third bevel gear is provided with a bearing base, which is installed on the inner side of the bottom of the gearbox; the output end of the second bevel gear is connected to a third drive shaft, and the other end of the third drive shaft passes through the gearbox, serving as the output end of the speed reduction transmission unit and connected to the active component of the chain drive unit.

7. A large curtain pulling machine with emergency manual operation and variable frequency speed control as described in claim 6, characterized in that, The active component of the chain drive unit includes an active sprocket, which is connected to the end of the third drive shaft away from the second bevel gear and the manual emergency unit via keys. A driven sprocket is provided on the top of the active sprocket, which is installed on the inner side of the top of the cabinet. The active sprocket and the driven sprocket are connected by a drive chain. The output end of the driven sprocket is fixedly connected to the curtain drive shaft. A through hole is provided on the side wall of the cabinet, and the curtain drive shaft extends through the through hole to the outside of the cabinet to drive the curtain to open and close.

8. A large curtain pulling machine with emergency manual operation and variable frequency speed control according to claim 7, characterized in that, The manual emergency unit includes a fourth drive shaft and a manual wheel. One end of the fourth drive shaft is connected to the drive sprocket via a key, and the other end of the fourth drive shaft passes through the cabinet and is connected to the manual wheel. A one-way bearing is provided between the fourth drive shaft and the manual wheel. The one-way bearing is fixed to the inner side of the cabinet side wall to allow the power of the manual wheel to be transmitted to the drive sprocket via the fourth drive shaft, and to block the reverse power transmission from the drive sprocket to the fourth drive shaft and the manual wheel in electric mode, thereby preventing the manual wheel from moving.

9. A large curtain pulling machine with emergency manual operation and variable frequency speed control as described in claim 1, characterized in that, A control panel is fixedly installed on the top outer wall of the cabinet. The control panel is electrically connected to the variable frequency motor, the variable frequency speed controller and the electromagnetic clutch respectively, and is used to control the start and stop of the variable frequency motor, the speed adjustment of the variable frequency speed controller and the on and off state of the electromagnetic clutch.

10. A large curtain pulling machine with emergency manual operation and variable frequency speed control according to claim 1, characterized in that, The front of the cabinet is provided with a door structure, which is a sliding door. One side of the sliding door is rotatably connected to the side wall of the cabinet by a hinge, and the other side is snapped into the cabinet by a buckle, which is used to facilitate the inspection and maintenance of the power unit, transmission control unit and reduction transmission unit inside the cabinet.

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