A motorized curtain driven by a deceleration motor

Abstract

The utility model discloses a kind of electric curtain driven by reduction motor, belong to projection curtain technical field.The electric curtain includes curtain storage bin, pivot drive module and curtain pivot, wherein pivot drive module adopts motor reduction module (including four-stage gear transmission structure) formed by direct current motor cooperation pure gear, Hall detection magnet wheel and multiple Hall induction elements are set in motor shaft end to realize accurate rotation detection.Compared with prior art, the utility model replaces worm gear reducer by pure gear transmission, and transmission efficiency is improved to more than 95%, solves the problem that traditional stroke limiter is not accurately positioned and worm gear is large, low efficiency;While, Hall element detection scheme is stronger than current detection anti-interference, can accurately control curtain in lifting limit position automatic stop. Curtain pivot is realized curtain winding and unwinding by the friction transmission of winding drum drive wheel and curtain winding drum.The design has the advantages of simple structure, low cost, good durability etc.

Description

Technical Field

[0001] This invention relates to the field of projection screen technology and provides an electric screen driven by a geared motor. Background Technology

[0002] A projection screen is a crucial accessory for projectors, serving as the imaging component. Currently, for ease of operation, projection screens typically employ motorized lifting. In practice, when the screen reaches its maximum height, the motor must be stopped to prevent overload. A common solution is to use a travel limit switch to control the drive motor. The limit switch records the screen's travel distance and stops the motor when it senses the screen has reached its limit. However, over time, the travel limit switch may become inaccurate. This can lead to situations where the screen has reached its limit, but the limit switch hasn't triggered, causing the motor to continue moving. Under overload conditions, damage is likely to occur. In a utility model patent titled "Stalled DC Motor for Projection Screen Rewinding and its Control Device" (authorization announcement number: CN220775515U), a screen drive device using a DC motor and a worm gear reducer is adopted. The motor's operation is controlled by detecting the DC motor's operating current. Although this method eliminates the travel limiter, the worm gear, due to its meshing method which is mainly based on sliding friction, has a large energy loss and its efficiency is usually only 50%-90%, far lower than the more than 95% of gear transmission. At the same time, it will also lead to increased heat generation. In addition, controlling the motor's operation by detecting the current is easily affected by interference and has low detection accuracy. Utility Model Content

[0003] Therefore, this utility model provides an electric curtain driven by a geared motor. It uses a DC motor in conjunction with a motor reduction module composed of pure gears to achieve stable low-speed output. The rotation of the motor is detected by setting multiple Hall elements at one end of the motor shaft to achieve high-precision motor control.

[0004] To achieve the above objectives, this utility model provides the following technical solution: an electric curtain driven by a geared motor, comprising: Screen storage compartment, used for installing other components; A rotating shaft drive module is fixedly installed on one side of the curtain storage compartment. It includes a drive motor. One end of the motor's rotating shaft is connected to a motor reduction module, and the other end is fixedly connected to a Hall detection magnetic wheel. A control board is provided on the side of the drive motor near the Hall detection magnetic wheel. The control board is provided with at least two Hall sensing elements, which are located on the outside of the Hall detection magnetic wheel. The screen hinge is rotatably mounted in the screen storage compartment. The motor reduction module is equipped with a reducer output shaft, which is driven and connected to the screen hinge to drive the screen hinge to rotate. The projection screen is wrapped around the outside of the screen hinge. By rotating the screen hinge forward and backward, the projection screen can be controlled to unfold and retract.

[0005] Furthermore, the drive motor is a DC motor, and the motor reduction module includes a first input gear, a first output gear, a second input gear, a second output gear, a third input gear, a third output gear, and a fourth input gear. The first input gear and the first output gear, the second input gear and the second output gear, and the third input gear and the third output gear are all coaxially and fixedly connected. The fourth input gear is coaxially and fixedly connected to the reducer output shaft. The motor rotation shaft is meshed with the first input gear through motor gears. The first output gear is meshed with the second input gear, the second output gear is meshed with the third input gear, and the third output gear is meshed with the fourth input gear.

[0006] Furthermore, the motor reduction module includes a first gear shaft and a second gear shaft arranged in parallel. The first input gear, the first output gear, the third input gear, and the third output gear are rotatably mounted on the first gear shaft, and the second input gear, the second output gear, the fourth input gear, and the reducer output shaft are rotatably mounted on the second gear shaft.

[0007] Furthermore, the motor reduction module includes a first fixed plate, a second fixed plate, and a third fixed plate arranged sequentially from top to bottom. A first gear shaft is rotatably arranged between the first fixed plate and the third fixed plate. A second gear shaft and a third gear shaft are rotatably arranged between the first fixed plate and the second fixed plate. A first input gear and a first output gear are rotatably arranged on the first gear shaft. A second input gear, a second output gear, a fourth input gear, and a reducer output shaft are rotatably arranged on the second gear shaft. A third input gear and a third output gear are rotatably arranged on the third gear shaft.

[0008] Furthermore, the second gear shaft is coaxially arranged with the motor rotation shaft.

[0009] Furthermore, the control board is equipped with a USB-C interface for power supply and data connection.

[0010] Furthermore, a screen winding cylinder is sleeved on the outside of the screen pivot, and the projection screen is wound around the outside of the screen winding cylinder. At least one winding cylinder drive wheel is fixedly arranged on the screen pivot along the axial direction. The winding cylinder drive wheel abuts against the inner side of the screen winding cylinder. When the winding cylinder drive wheel rotates, it can drive the screen winding cylinder to rotate, thereby controlling the unfolding and retraction of the projection screen.

[0011] Compared with the prior art, the beneficial effects of this utility model are: 1. In the present invention, a DC motor is used in conjunction with a motor reduction module composed of multiple gears to provide a stable low-speed rotation driving force for the curtain shaft. At the same time, Hall effect detection elements are used to control the start, stop, forward and reverse rotation of the DC motor. Compared with the traditional design, the cost is lower, the pure gear structure has high transmission efficiency, low heat generation, and good durability. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of an electric curtain driven by a geared motor mentioned in Example 1; Figure 2 for Figure 1 A schematic diagram of the internal structure of an electric curtain driven by a geared motor. Figure 3 This is a schematic diagram of the shaft drive module mentioned in Example 1; Figure 4 This is a schematic diagram of the internal structure of the motor reduction module mentioned in Example 1; Figure 5 for Figure 4 The diagram shows the internal structure of the motor reduction module after the housing has been removed, as mentioned in the article. Figure 6 This is a schematic diagram of the structure of an electric curtain driven by a geared motor, as mentioned in Example 2; Figure 7 for Figure 6 A schematic diagram of the internal structure of an electric curtain driven by a geared motor. Figure 8 This is a schematic diagram of the shaft drive module mentioned in Example 2; Figure 9 This is a schematic diagram of the internal structure of the motor reduction module mentioned in Example 2; Figure 10 for Figure 9 The diagram shows the internal structure of the motor reduction module after the housing has been removed.

[0013] In the picture: 100. Curtain storage compartment; 200. Shaft drive module; 210. Drive motor; 211. Motor rotating shaft; 220. Motor reduction module; 221. First input gear; 222. First output gear; 223. Second input gear; 224. Second output gear; 225. Third input gear; 226. Third output gear; 227. Fourth input gear; 228. Reducer output shaft; 229. First gear shaft; 2210. Second gear shaft; 2211. Third gear shaft; 2212. First fixing plate; 2213. Second fixing plate; 2214. Third fixing plate; 230. Hall detection magnetic wheel; 240. Control board; 250. Hall sensing element; 260. USB-C interface; 300. Curtain pivot; 310. Winding drum drive wheel; 400. Curtain roll; 500. Projection screen. Detailed Implementation

[0014] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0015] Example 1, refer to Appendix Figure 1 ~Appendix Figure 2 The present invention provides an electric curtain driven by a geared motor, including a curtain storage compartment 100 for mounting various components, and a rotating shaft drive module 200 fixedly mounted on one side of the curtain storage compartment 100, as shown in the attached figure. Figure 3 As shown, the rotating shaft drive module 200 includes a drive motor 210, which is a DC motor. DC motors are simple in structure, not prone to failure, and inexpensive, offering good economic benefits. One end of the motor rotating shaft 211 is connected to the motor reduction module 220, and the other end is fixedly connected to a Hall effect detection magnetic wheel 230. A control board 240 is located on the side of the drive motor 210 near the Hall effect detection magnetic wheel 230. The control board 240 is equipped with a USB-C interface 260 for power supply and data connection. The USB-C interface 260 offers various power supply options and, compared to the traditional 220V direct connection circuit, makes the electric curtain body safer. The control board 240 also has at least two Hall effect sensors 250 located outside the Hall effect detection magnetic wheel 230. A curtain rotating shaft 300 is rotatably mounted inside the curtain storage compartment 100. The aforementioned motor reduction module 220 is equipped with a reducer output shaft 228. Additionally, as shown in the attached diagram... Figure 4 Appendix Figure 5As shown, the motor reduction module 220 includes a first input gear 221, a first output gear 222, a second input gear 223, a second output gear 224, a third input gear 225, a third output gear 226, and a fourth input gear 227. The first input gear 221 is coaxially and fixedly connected to the first output gear 222, the second input gear 223 is coaxially and fixedly connected to the second output gear 224, and the third input gear 225 is coaxially and fixedly connected to the third output gear 226. The fourth input gear 227 is coaxially and fixedly connected to the reducer output shaft 228. The motor rotation shaft 211 is meshed with the first input gear 221 through a motor gear, and the first output gear 222 is coaxially and fixedly connected to the second input gear 226. Gear 223 meshes with the second output gear 224 and the third input gear 225, and the third output gear 226 meshes with the fourth input gear 227. In this embodiment, the motor reduction module 220 includes a first gear shaft 229 and a second gear shaft 2210 arranged in parallel. The first input gear 221, the first output gear 222, the third input gear 225, and the third output gear 226 are rotatably mounted on the first gear shaft 229. The second input gear 223, the second output gear 224, the fourth input gear 227, and the reducer output shaft 228 are rotatably mounted on the second gear shaft 2210. The reducer output shaft 228 is connected to... The screen pivot 300 is driven by a multi-stage gear set to output a stable low-speed driving force. A screen roller 400 is sleeved on the outside of the screen pivot 300, and the projection screen 500 is wound around the outside of the screen roller 400. At least one roller drive wheel 310 is fixedly installed on the screen pivot 300 along the axial direction. The roller drive wheel 310 abuts against the inner side of the screen roller 400. By driving the roller drive wheel 310 to rotate in both forward and reverse directions, the screen pivot 300 can drive the screen roller 400 to rotate, thereby controlling the opening and closing of the projection screen 500. During the opening and closing of the projection screen 500, Hall effect sensors detect... The magnetic wheel 230 rotates under the drive of the motor shaft 211. During the rotation, the two poles of the Hall detection magnetic wheel 230 reciprocate through the Hall sensing element 250. The number of magnetic pole changes detected by the Hall sensing element 250 can be used to obtain the number of rotations of the motor shaft 211. Then, based on the reduction ratio of the motor reduction module 220, the final number of rotations of the screen shaft 300 can be obtained. In this way, the final number of rotations of the DC motor can be set according to the length of the projection screen 500. At the same time, by setting two or more Hall sensing elements 250, the forward and reverse rotation of the DC motor can be obtained by the order in which different Hall sensing elements 250 are passed.

[0016] Example 2, refer to Appendix Figure 6 ~Appendix Figure 8 The content differs from that of Example 1, as shown in the appendix. Figure 9 Appendix Figure 10As shown, the motor reduction module 220 includes a first fixing plate 2212, a second fixing plate 2213, and a third fixing plate 2214 arranged sequentially from top to bottom. A first gear shaft 229 is rotatably mounted between the first fixing plate 2212 and the third fixing plate 2214. A second gear shaft 2210 and a third gear shaft 2211 are rotatably mounted between the first fixing plate 2212 and the second fixing plate 2213. The second gear shaft 2210 is coaxially mounted with the motor rotation shaft 211. A first input gear 221 and a first output gear 222 are rotatably mounted on the first gear shaft 229. A second input gear 223, a second output gear 224, a fourth input gear 227, and a reducer output shaft 228 are rotatably mounted on the second gear shaft 2210. A third input gear 225 and a third output gear 226 are also rotatably mounted on the reducer output shaft 229. Wheel 226 is rotatably mounted on the third gear shaft 2211. Compared with the scheme in Embodiment 1, the motor reduction module 220 in Embodiment 2 also adopts a four-stage reduction scheme. However, in Embodiment 2, the second gear shaft 2210 is coaxially set with the motor rotation shaft 211, which ultimately makes the reducer output shaft 228 coaxial with the motor rotation shaft 211. Most of the reduction gears are arranged on both sides of the reducer output shaft 228 and the motor rotation shaft 211 through the first gear shaft 229 and the third gear shaft 2211. Compared with the scheme in Embodiment 1, this structure has a more stable operating structure. At the same time, the three-layer fixing plate (first fixing plate 2212, second fixing plate 2213 and third fixing plate 2214) structure increases the vertical space between the reduction gears, avoids the reduction gears being too concentrated, and improves the heat dissipation performance.

[0017] In the description of this utility model, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0018] The above are merely preferred embodiments of this utility model. Any person skilled in the art may modify this utility model or modify it into an equivalent technical solution using the technical solutions described above. Therefore, any simple modifications or equivalent substitutions made based on the technical solutions of this utility model are within the scope of protection claimed by this utility model.

Claims

1. A motorized curtain driven by a reduction motor, characterized in that, include: A curtain storage compartment (100) is used to install other components; A rotating shaft drive module (200) is fixedly installed on one side of the curtain storage compartment (100), including a drive motor (210). One end of the motor rotating shaft (211) of the drive motor (210) is connected to a motor reduction module (220), and the other end is fixedly connected to a Hall detection magnetic wheel (230). A control board (240) is provided on the side of the drive motor (210) near the Hall detection magnetic wheel (230). The control board (240) is provided with at least two Hall sensing elements (250), and the Hall sensing elements (250) are located on the outside of the Hall detection magnetic wheel (230). A screen pivot (300) is rotatably mounted in the screen storage compartment (100). The motor reduction module (220) is equipped with a reducer output shaft (228), which is driven to drive the screen pivot (300) to rotate. A projection screen (500) is wrapped around the outside of the screen pivot (300). The projection screen (500) can be controlled to unfold and retract by rotating the screen pivot (300) in both directions.

2. The electric curtain driven by a geared motor according to claim 1, characterized in that: The drive motor (210) is a DC motor. The motor reduction module (220) includes a first input gear (221), a first output gear (222), a second input gear (223), a second output gear (224), a third input gear (225), a third output gear (226), and a fourth input gear (227). The first input gear (221) and the first output gear (222), the second input gear (223) and the second output gear (224), the third input gear (225) and the fourth input gear (226) are connected. 5) The fourth input gear (227) is coaxially fixedly connected to the third output gear (226), and the fourth input gear (227) is coaxially fixedly connected to the reducer output shaft (228). The motor rotating shaft (211) is meshed with the first input gear (221) through the motor gear. The first output gear (222) is meshed with the second input gear (223), the second output gear (224) is meshed with the third input gear (225), and the third output gear (226) is meshed with the fourth input gear (227).

3. The electric curtain driven by a geared motor according to claim 2, characterized in that: The motor reduction module (220) includes a first gear shaft (229) and a second gear shaft (2210) arranged in parallel. The first input gear (221), the first output gear (222), the third input gear (225) and the third output gear (226) are rotatably mounted on the first gear shaft (229), and the second input gear (223), the second output gear (224), the fourth input gear (227) and the reducer output shaft (228) are rotatably mounted on the second gear shaft (2210).

4. The electric curtain driven by a geared motor according to claim 2, characterized in that: The motor reduction module (220) includes a first fixed plate (2212), a second fixed plate (2213), and a third fixed plate (2214) arranged sequentially from top to bottom. A first gear shaft (229) is rotatably arranged between the first fixed plate (2212) and the third fixed plate (2214). A second gear shaft (2210) and a third gear shaft (2211) are rotatably arranged between the first fixed plate (2212) and the second fixed plate (2213). A first input gear (221) and a first output gear (222) are rotatably arranged on the first gear shaft (229). A second input gear (223), a second output gear (224), a fourth input gear (227), and a reducer output shaft (228) are rotatably arranged on the second gear shaft (2210). A third input gear (225) and a third output gear (226) are rotatably arranged on the third gear shaft (2211).

5. A motorized curtain driven by a reduction gear motor according to claim 4, characterized in that: The second gear shaft (2210) is coaxially arranged with the motor rotating shaft (211).

6. An electric curtain driven by a geared motor according to any one of claims 2 to 5, characterized in that: The control board (240) is provided with a USB-C interface (260) for power supply and data connection.

7. An electric curtain driven by a geared motor according to claim 6, characterized in that: A screen roller (400) is sleeved on the outside of the screen pivot (300), and the projection screen (500) is wound around the outside of the screen roller (400). At least one roller drive wheel (310) is fixedly provided on the screen pivot (300) along the axial direction. The roller drive wheel (310) abuts against the inner side of the screen roller (400). When the roller drive wheel (310) rotates, it can drive the screen roller (400) to rotate, thereby controlling the unfolding and retraction of the projection screen (500).

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