A direct current brushless motor power device for an automatic door

Abstract

The application relates to a direct-current brushless motor power device for an automatic door, which comprises a main support for being connected with a door leaf; a motor arranged on the main support, the motor being a direct-current brushless motor provided with a Hall sensor; a driving pulley connected with an output shaft of the motor; a guide rail wheel rotatably arranged on the main support, the guide rail wheel being used for being connected with a running track; and a driven pulley rotatably arranged on the main support, the driven pulley being connected with the driving pulley and used for rotating the guide rail wheel. The application has the effects of high transmission efficiency and low noise of the direct-current brushless motor power device.

Description

Technical Field

[0001] This application relates to the technical field of automatic sensor doors, and in particular to a DC brushless motor power unit for automatic doors. Background Technology

[0002] Automatic doors, also known as automatic sensor doors, are devices that can automatically sense whether someone is near the door and automatically control the opening and closing of the door based on the sensing result. They are widely used in shopping malls, hotels, office buildings, and other places. The door leaf is slidably installed on the travel track, and the door leaf will reciprocate linearly along the length of the travel track under the action of the motor power device.

[0003] In related technologies, the motor power unit includes a main support, a DC brushed motor, a gear reducer, and guide wheels. The main support is connected to the door leaf; the DC brushed motor is fixedly mounted on the main support; the gear reducer is mounted on the main support, and the input shaft of the gear reducer is connected to the output shaft of the DC brushed motor; the guide wheels are rotatably connected to the main support, and the guide wheels are connected to the output shaft of the gear reducer, while also being slidably connected to the travel track.

[0004] Regarding the aforementioned technologies, the reduction transmission between the motor and the guide wheel is achieved through a gear reducer, which is a multi-stage gear transmission. This results in low transmission efficiency and high operating noise in the DC brushless motor power unit. Summary of the Invention

[0005] In order to achieve high transmission efficiency and low noise in the DC brushless motor power unit, this application provides a DC brushless motor power unit for automatic doors.

[0006] The DC brushless motor power unit for automatic doors provided in this application adopts the following technical solution:

[0007] A DC brushless motor power unit for automatic doors includes:

[0008] Main bracket, used to connect to the door leaf;

[0009] The motor is mounted on the main support and is a brushless DC motor equipped with a Hall sensor.

[0010] The drive pulley is connected to the output shaft of the motor;

[0011] The guide wheel is rotatably mounted on the main support and is used to connect with the travel track;

[0012] The driven pulley is rotatably mounted on the main support and is connected to the driving pulley. The driven pulley is used to rotate the guide wheel.

[0013] By adopting the above technical solution, due to the setting of the driving pulley and the driven pulley, when the motor starts, the guide rail wheel can be rotated through the cooperation between the driving pulley and the driven pulley, thereby achieving the purpose of moving the door leaf. At the same time, compared with the gear reducer to achieve a speed reduction transmission between the motor and the guide rail wheel, this design method has a higher transmission efficiency than gear transmission at the same manufacturing cost, and the noise during the belt drive process is also significantly less than that of gear transmission. In addition, the power unit will not be damaged when the automatic door is pushed in the reverse direction.

[0014] Preferably, there are two drive pulleys, one for closing and one for opening, both rotatably connected to the main support. There are also two driven pulleys, one for closing and one for opening. The closing driven pulley and the closing drive pulley are connected via an open-loop transmission, while the opening driven pulley and the opening drive pulley are connected via a cross-loop transmission. A transmission selection component is provided on the main support, connected to the output shaft of the motor. This component enables the motor to drive either the closing drive pulley or the opening drive pulley to rotate.

[0015] By adopting the above technical solution, since the closing drive wheel and the closing driven wheel are driven by an open transmission, and the opening drive wheel and the opening driven wheel are driven by a cross transmission, when the closing drive wheel and the opening drive wheel rotate in the same direction, the closing driven wheel and the opening driven wheel rotate in opposite directions. Therefore, the motor can drive the closing drive wheel or the opening drive wheel to rotate through the transmission selection component, so as to realize the forward and reverse rotation of the guide wheel. This allows the door to be opened and closed without the motor switching the rotation direction, thereby reducing the wear and tear on the motor and the transmission loss between the drive pulley and the driven pulley.

[0016] Preferably, the main support is provided with two mounting tubes, the inner side of which allows components to pass through; the drive pulley includes a mounting part and a transmission part, the mounting part being sleeved on the mounting tube via a bearing; the transmission part is exposed outside the mounting tube, and the inner diameter of the transmission part is smaller than the inner diameter of the mounting part.

[0017] By adopting the above technical solution, since the drive pulley includes a mounting part and a transmission part, on the one hand, the purpose of rotating the drive pulley on the main support is achieved; on the other hand, since the inner diameter of the transmission part is smaller than the inner diameter of the mounting part, a structural basis is provided for the connection between the element driving the drive pulley and the drive pulley, thereby providing a structural basis for the motor to drive the closing drive pulley or the opening drive pulley to rotate respectively.

[0018] Preferably, the inner wall of the transmission part is provided with a slot; the transmission selection component includes:

[0019] A transmission tube is rotatably connected to the main support. The transmission tube is connected to the output shaft of the motor. The transmission tube passes through the two drive pulleys. The transmission tube is provided with through holes, which are located at the position of the transmission part.

[0020] A transmission pin is slidably connected in the through hole, and the end of the transmission pin away from the axis of the transmission tube can be inserted into the slot.

[0021] A pin drive is connected to the transmission pin. The pin drive is used to slide the transmission pin in and out of the slot. The connection between the pin drive and the transmission pin does not interfere with the rotation of the transmission tube.

[0022] By adopting the above technical solution, when the motor is to drive the closing drive wheel or the opening drive wheel to rotate, the transmission pin can be inserted into the slot of the closing drive wheel or the opening drive wheel through the pin drive component, so that the transmission tube is connected to the closing drive wheel or the opening drive wheel. At the same time, the connection between the pin drive component and the transmission pin will not interfere with the rotation of the transmission tube, thereby achieving the purpose of driving the motor to drive the closing drive wheel or the opening drive wheel to rotate.

[0023] Preferably, the pin drive includes:

[0024] A guide rod is slidably connected to the main bracket. One end of the guide rod passes through the transmission tube. The guide rod is provided with an opening guide part. The outer peripheral wall of the opening guide part is in movable contact with the transmission pin. When the transmission pin moves from a position with a smaller cross-sectional area to a larger position, the transmission pin is inserted into the slot.

[0025] A return spring is connected to the transmission pin, and the return spring is used to disengage the transmission pin from the slot;

[0026] A telescopic cylinder is mounted on the main support, and the piston rod of the telescopic cylinder is connected to the guide rod.

[0027] By adopting the above technical solution, when connecting the transmission tube to the drive pulley, the piston rod of the transmission telescopic cylinder is first extended. During this process, the guide rod gradually extends into the transmission tube. Then, by opening the guide part, the transmission pin gradually moves away from the center of the transmission tube. When the transmission pin abuts at the position with the largest cross-sectional area of ​​the opening guide part, the transmission pin will be inserted into the slot, thereby achieving the purpose of connecting the transmission tube to the drive pulley. At the same time, since there is no contact between the transmission pin and the opening guide part, the connection between the pin drive component and the transmission pin will not affect the rotation of the transmission tube. To disconnect the transmission tube from the drive pulley, the piston rod of the transmission telescopic cylinder is first retracted. During this process, the guide rod gradually moves out of the transmission tube. Then, the return spring will use its own elastic force to make the transmission pin leave the slot, thereby achieving the purpose of disconnecting the transmission tube from the drive pulley.

[0028] Preferably, a synchronous driving wheel is connected to the output shaft of the motor; a synchronous driven wheel is sleeved on the transmission tube, and the synchronous driven wheel is connected to the synchronous driving wheel; two guide rods are provided, with one end of the two guide rods close to each other inserted into both ends of the transmission tube; two transmission telescopic cylinders are provided, with the piston rod of one transmission telescopic cylinder connected to one of the guide rods.

[0029] By adopting the above technical solution, compared to the method where the motor's output shaft is directly connected to one end of the transmission tube and the guide rod can only be inserted from the other end of the transmission tube, this design ensures that the guide rod, during insertion into the transmission tube, only abuts against the transmission pin that cooperates with the closing or opening drive wheel. Therefore, when the door is frequently opening or closing, the motor will not mistakenly trigger the closing drive wheel to rotate before the opening drive wheel rotates, or vice versa. Thus, during peak hours, if the door is stationary, both guide rods can be pulled out of the transmission tube while the motor is running at low speed. The corresponding guide rod is then inserted into the transmission tube only when the door is about to open or close. This makes the opening and closing of the door smoother and reduces the number of times the motor is repeatedly started, thereby improving the performance and lifespan of the power unit.

[0030] Preferably, the main support is provided with a tension adjustment assembly, the tension adjustment assembly comprising:

[0031] A sliding shaft is slidably mounted on the main support, and the sliding shaft can approach the line connecting the driving pulley and the driven pulley;

[0032] The tensioning pulley is rotatably mounted on the sliding shaft and is used to abut against the belt;

[0033] A tensioning telescopic cylinder is mounted on the main support, and the piston rod of the tensioning telescopic cylinder is connected to the sliding shaft;

[0034] A speed sensor is mounted on the main support, and the speed sensor is used to detect the rotational speed of the motor.

[0035] By adopting the above technical solution, when the door is to be opened or closed, the motor speed will gradually increase. When the motor speed is relatively slow, the sliding axis can be moved away from the line connecting the driving pulley and the driven pulley by the tensioning telescopic cylinder, so as to reduce the belt tension between the driving pulley and the driven pulley, thereby reducing the resistance torque on the motor. When the motor speed is relatively fast, the sliding axis can be moved closer to the line connecting the driving pulley and the driven pulley by the tensioning telescopic cylinder, so as to increase the belt tension between the driving pulley and the driven pulley, thereby enabling the door to move more smoothly and quickly.

[0036] Preferably, the closing drive wheel further includes a blowing section located between the mounting section and the transmission section. The blowing section is provided with an annular gas groove and an output channel. The annular gas groove is located on the inner wall of the blowing section. One end of the output channel is connected to the annular gas groove, and the other end is connected to the outer wall of the periphery of the closing drive wheel. An auxiliary pipe is provided through the main support. The auxiliary pipe is located between the transmission pipe and the mounting pipe. The auxiliary pipe is provided with an input channel. One end of the input channel is used to connect to an external air source, and the other end is connected to the annular gas groove. A closing resistance sensor is provided on the main support. When the resistance detected by the closing resistance sensor exceeds a predetermined value, the tensioning wheel is first moved away from the line connecting the closing drive wheel and the closing driven wheel. Then, gas is ejected from the output channel to disengage the belt from the closing drive wheel.

[0037] By adopting the above technical solution, such as automatic doors in access control areas, where one side of the door only requires a person to approach to open it, while the other side requires an operation such as swiping a card, people often quickly pass between the doors during the closing process. When the door encounters resistance exceeding a predetermined value, the tension adjustment component first loosens the belt, then an external air source fills the input channel with gas, which flows into the annular gas groove, and finally flows out from the output channel, causing the belt to disengage from the closing drive wheel, thus stopping the door. Compared to... By removing the guide rod from the transmission tube, this design allows the transmission tube and the closing drive wheel to continue rotating at high speed. If no one needs to pass through the door afterward, the external air supply is cut off to allow the belt to re-engage with the closing drive wheel. Then, the belt is gradually tightened through the tension adjustment component, allowing the door to start more quickly and continue the closing motion. Thus, in the event of an emergency, the door can quickly stop and open without stopping the motor, thereby improving performance while reducing device wear and tear and reducing the maintenance cost of the automatic door.

[0038] Preferably, the main support is equipped with a closing stroke detector. When the closing stroke of the door leaf is less than one-third complete and the resistance experienced by the door leaf exceeds a predetermined value, the guide rod is not pulled out from the transmission tube, and gas can be ejected from the output channel. When the closing stroke of the door leaf is more than two-thirds complete and the resistance experienced by the door leaf exceeds a predetermined value, the transmission selection component first disconnects the motor from the closing drive wheel, and then causes the motor to drive the opening drive wheel to rotate.

[0039] By adopting the above technical solution, if the resistance experienced by the door leaf during the closing process exceeds a predetermined value due to collisions, and the closing stroke is less than one-third complete, the guide rod will not be withdrawn from the transmission tube. Simultaneously, the tension adjustment component loosens the belt, and gas is ejected from the output channel, causing the belt to disengage from the closing drive wheel. This allows the door leaf to temporarily stop, and resume closing only when no one else passes by. With this design, the motor speed does not need to be reduced after it increases to accommodate the guide rod insertion into the transmission tube. The connection between the drive tube and the closing drive wheel reduces the frequency of motor state switching and allows the door to stop and restart promptly. When the closing stroke is more than two-thirds complete, the guide rod that works with the closing drive wheel is first pulled out of the drive tube, then the motor speed is appropriately slowed down, and then the guide rod that works with the opening drive wheel is inserted into the drive tube. This causes the guide wheel to quickly change its direction of movement, thus opening the door promptly to prevent further collisions with the door and improve the safety of the automatic door during use.

[0040] In summary, this application includes at least one of the following beneficial technical effects:

[0041] 1. By setting up a motor, driving pulley and driven pulley, belt drive has higher transmission efficiency than gear drive under the same manufacturing cost. In addition, the noise in the belt drive process is also significantly less than that in gear drive, thus enabling the DC brushless motor power unit to have high transmission efficiency and low noise.

[0042] 2. By setting the transmission selection component, the door can be opened and closed without the motor changing its rotation direction, thereby reducing the wear and tear on the motor and the transmission loss between the drive pulley and the driven pulley. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the structure of the DC brushless motor power unit in the embodiments of this application.

[0044] Figure 2 This is a schematic diagram illustrating the structure of the transmission selection component in the embodiments of this application.

[0045] Figure 3 This is a schematic diagram illustrating the structure of the tension adjustment component in an embodiment of this application.

[0046] Figure 4 yes Figure 2 The image in the middle is an enlarged view of point A.

[0047] Explanation of reference numerals in the attached drawings: 1. Main support; 11. Mounting tube; 12. Auxiliary tube; 13. Input channel; 14. Closing resistance sensor; 15. Closing stroke detector; 2. Motor; 21. Synchronous drive pulley; 3. Drive pulley; 31. Closing drive pulley; 32. Opening drive pulley; 33. Mounting part; 34. Transmission part; 341. Slot; 35. Blowing part; 351. Annular gas groove; 352. Output channel; 4. Guide wheel; 5. Driven pulley; 51. Closing driven pulley; 52. Opening driven pulley; 6. Transmission selection component; 61. Transmission tube; 611. Perforation; 612. Synchronous driven pulley; 62. Transmission pin; 63. Guide rod; 631. Opening guide part; 64. Return spring; 65. Transmission telescopic cylinder; 7. Tension adjustment component; 71. Sliding shaft; 72. Tensioning wheel; 73. Tension telescopic cylinder; 74. Speed ​​sensor. Detailed Implementation

[0048] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0049] This application discloses a DC brushless motor power unit for automatic doors. (Refer to...) Figure 1The DC brushless motor 2 power unit includes a main bracket 1, a motor 2, a drive pulley 3, a guide wheel 4, and a driven pulley 5. The main bracket 1 is fixedly connected to the door leaf; the motor 2 is fixedly mounted on the main bracket 1; the drive pulley 3 is connected to the output shaft of the motor 2 so that the output shaft of the motor 2 can rotate the drive pulley 3; the guide wheel 4 is rotatably connected to the main bracket 1 via a cylindrical shaft, and the guide wheel 4 is also connected to the travel track; the driven pulley 5 is fixedly sleeved on the shaft connected to the guide wheel 4, and the driven pulley 5 is belt-connected to the drive pulley 3, so the driven pulley 5 can rotate the guide wheel 4. Compared with the method of driving the guide wheel 4 to rotate through a gear reducer, this design method has higher transmission efficiency than gear transmission at the same manufacturing cost, and the noise generated by belt transmission is also significantly less than that of gear transmission, thus enabling the DC brushless motor 2 power unit to have high transmission efficiency and low noise.

[0050] In this embodiment, motor 2 is a brushless DC motor equipped with a Hall sensor to detect changes in the magnetic field of the motor rotor magnet. The Hall signal also serves as feedback for the motor speed, controlling the speed to regulate the opening and closing speed of the automatic door. Furthermore, the Hall sensor exhibits low power consumption, specifically a standby power consumption of 1.08 * 10^ -4 W±10%.

[0051] Reference Figure 1 and Figure 2 In this embodiment, in order to enable the guide wheel 4 to rotate clockwise and counterclockwise when the motor 2 rotates in one direction, the following configuration is provided: First, there are two drive pulleys 3, both of which are rotatably connected to the main support 1. Specifically, two mounting tubes 11 are coaxially spaced and fixedly installed on the main support 1 as the connection basis between the drive pulleys 3 and the main support 1. Each drive pulley 3 includes a mounting part 33 and a transmission part 34. The mounting part 33 is sleeved on the mounting tube 11 through a bearing, while the transmission part 34 is exposed outside the mounting tube 11. The inner diameter of the transmission part 34 is smaller than the inner diameter of the mounting part 33, which serves as the basis for the subsequent transmission connection between the drive pulley 3 and the motor 2. In addition, for easy distinction, the two drive pulleys 3 are divided into a closing drive pulley 31 and an opening drive pulley 32.

[0052] Reference Figure 1 and Figure 2Secondly, there are two driven pulleys 5. The two driven pulleys 5 are a closing driven pulley 51 and an opening driven pulley 52. ​​The closing driven pulley 51 and the closing driving pulley 31 are connected by an open transmission, while the opening driven pulley 52 and the opening driving pulley 32 are connected by a cross transmission. When the closing driving pulley 31 and the opening driving pulley 32 rotate in the same direction, the rotation directions of the closing driven pulley 51 and the opening driven pulley 52 are opposite. This forms the basis for the transmission of the driving pulley 3 rotating in the same direction, causing the guide wheel 4 to rotate in both the forward and reverse directions.

[0053] Reference Figure 1 and Figure 2 Thirdly, slots 341 are provided on the inner walls of the transmission parts 34 of the two drive pulleys 3, and multiple slots 341 are evenly distributed around the axis of the transmission part 34. In this embodiment, a transmission selection component 6 is provided on the main support 1. Specifically, the transmission selection component 6 includes a transmission tube 61, a transmission pin 62, and a pin drive component. The transmission tube 61 is rotatably connected to the main support 1 through a bearing. The transmission tube 61 is connected to the output shaft of the motor 2, and the transmission tube 61 also coaxially passes through the two drive pulleys 3. In addition, multiple through holes 611 are provided in the transmission part 34 of the transmission tube 61, and the multiple through holes 611 are evenly distributed around the axis of the transmission tube 61. The transmission pin 62 is slidably connected in the through hole 611, and the end of the transmission pin 62 away from the axis of the transmission tube 61 can be inserted into the slot 341 to realize the transmission connection between the transmission tube 61 and the drive pulley 3.

[0054] Reference Figure 1 and Figure 2 The pin drive component includes a guide rod 63, a return spring 64, and a transmission telescopic cylinder 65. The guide rod 63 is generally cylindrical in shape, with one end of the guide rod 63 inserted into the transmission tube 61. At this end, an opening guide portion 631 in the shape of a cone is integrally formed. The peripheral outer wall of the opening guide portion 631 abuts against the end of the transmission pin 62 away from the slot 341. When the transmission pin 62 moves from a position with a smaller cross-sectional area to a larger position, the transmission pin 62 will insert into the slot 341, so that the transmission tube 61 can be connected to the drive pulley 3. In this embodiment, there are two guide rods 63. The two guide rods 63 are inserted from both ends of the transmission tube 61, and one guide rod 63 is connected to the transmission pin 62 that cooperates with the closing drive wheel 31, while the other guide rod 63 is connected to the transmission pin 62 that cooperates with the opening drive wheel 32.

[0055] In addition, in this embodiment, since the transmission tubes 61 are all provided with guide rods 63, in order to realize the connection between the motor 2 and the transmission tubes 61, a synchronous drive wheel 21 is coaxially fixedly connected to the output shaft of the motor 2. The part of the transmission tube 61 located between the closing drive wheel 31 and the opening drive wheel 32 is fixedly fitted with a synchronous driven wheel 612, and there is a connection between the synchronous driven wheel 612 and the synchronous drive wheel 21.

[0056] Reference Figure 1 and Figure 2 One end of the return spring 64 is connected to the transmission pin 62, and the other end is connected to the transmission tube 61. When the guide rod 63 is pulled out of the transmission tube 61, the return spring 64 will cause the transmission pin 62 to leave the slot 341, thereby achieving the purpose of disconnecting the transmission tube 61 from the drive pulley 3. The transmission telescopic cylinder 65 is fixedly installed on the main bracket 1, and there are two transmission telescopic cylinders 65. The piston rod of one transmission telescopic cylinder 65 is connected to the end of one guide rod 63 away from the other guide rod 63. Thus, the transmission telescopic cylinder 65 can be used to insert or pull out the guide rod 63 from the transmission tube 61, thereby achieving the purpose of connecting or disconnecting the transmission tube 61 from the drive pulley 3.

[0057] Reference Figure 1 and Figure 2 In this embodiment, during the insertion of the guide rod 63 into the transmission tube 61, each guide rod 63 will only abut against the transmission pin 62 that cooperates with the closing drive wheel 31 or the opening drive wheel 32. Therefore, when the door is in a frequent opening or closing phase, such as during rush hour, if the door is in a stationary state, both guide rods 63 can be pulled out of the transmission tube 61 first, and the motor 2 can be kept in a low-speed rotation state at the same time. When the door is about to open or close, the corresponding guide rod 63 will be inserted into the transmission tube 61. This makes the opening or closing of the door smoother and reduces the number of times the motor 2 is repeatedly started, thereby improving the performance and life of the power device.

[0058] Reference Figure 1 and Figure 3In this embodiment, a tension adjustment assembly 7 is provided on the main support 1, and two tension adjustment assemblies 7 are provided. Each tension adjustment assembly cooperates with a driving pulley 3 and a driven pulley 5. Specifically, the tension adjustment assembly 7 includes a sliding shaft 71, a tension wheel 72, a tension telescopic cylinder 73, and a speed sensor 74. The sliding shaft 71 is slidably connected to the main support 1, and the sliding shaft 71 can move closer to or further away from the line connecting the driving pulley 3 and the driven pulley 5. The tension wheel 72 is rotatably sleeved on the sliding shaft 71 through a bearing, and the tension wheel 72 will abut against the belt. The tension telescopic cylinder 73 is fixedly installed on the main support 1, and the piston rod of the tension telescopic cylinder 73 is fixedly connected to the sliding shaft 71 so as to drive the sliding shaft 71 to perform reciprocating linear motion, thereby achieving the purpose of adjusting the belt tension.

[0059] Reference Figure 1 and Figure 3 The speed sensor 74 is mounted on the main support 1 and is used to detect the rotation speed of the motor 2. So when the door is to be opened or closed, the rotation speed of the motor 2 will gradually increase. When the rotation speed of the motor 2 is slow, the belt can be loosened by the tension adjustment component 7 to reduce the resistance torque on the motor 2. When the rotation speed of the motor 2 is fast, the belt can also be tightened by the tension adjustment component 7, so that the guide wheel 4 can drive the door to move more smoothly.

[0060] Reference Figure 2 and Figure 4 In automatic doors located in access control areas, one side of the door can be opened simply by a person approaching it, while the other side requires a card swipe or other operation. Therefore, people often pass quickly through the door during the closing process. To address this, the following configuration is provided: First, the closing drive wheel 31 also includes a blowing part 35 located between the mounting part 33 and the transmission part 34. Specifically, the inner diameter of the blowing part 35 is larger than that of the mounting part 33 and smaller than that of the transmission part 34. The blowing part 35 is provided with an annular air groove 351 and an output channel 352. The annular air groove 351 is located on the inner wall of the blowing part 35 and is coaxially arranged with the closing drive wheel 31. One end of the output channel 352 is connected to the annular air groove 351, and the other end is connected to the outer peripheral wall of the closing drive wheel 31. At the same time, multiple output channels 352 are evenly distributed around the axis of the closing drive wheel 31.

[0061] Reference Figure 1 and Figure 4Secondly, a closing resistance sensor 14 is installed on the main support 1 to detect the resistance encountered by the door leaf when closing. Thirdly, an auxiliary tube 12 is fixedly installed on the main support 1, and an input channel 13 is opened on the auxiliary tube 12. One end of the input channel 13 is located outside the mounting tube 11 and is connected to an external air source, while the other end is connected to an annular gas groove 351. When the external air source injects gas into the input channel 13, the gas can be ejected from the output channel 352. Fourthly, a closing resistance sensor is also installed on the main support 1. When the resistance value encountered by the door leaf due to a person colliding with the door leaf exceeds a predetermined value, the closing drive wheel 31 is first adjusted by the tension adjustment component 7. The belt between the closing driven wheel 51 is loosened, and then gas is continuously ejected from the output channel 352 to disengage the belt from the closing drive wheel 31, thus stopping the door. If no one needs to pass through the door afterward, the external air supply is cut off to restore the belt to contact with the closing drive wheel 31. Then, the belt is gradually tightened by the tension adjustment component 7, and the door can start more quickly to continue the closing motion. Thus, the door can quickly stop and open without stopping the motor 2 or pulling the guide rod 63 out of the transmission tube 61, thereby improving performance while reducing device wear and tear, thus reducing the maintenance cost of the automatic door.

[0062] Reference Figure 1 and Figure 2 In this embodiment, a closing stroke detector 15 is also installed on the main support 1. When the closing stroke of the door is less than one-third complete, if the resistance experienced by the door exceeds a predetermined value, the guide rod 63 does not need to be pulled out of the transmission tube 61. At the same time, the tension adjustment component 7 loosens the belt and sprays gas from the output channel 352 so that the door can be temporarily stopped. After no one passes through, the door can continue to complete the closing action. This ensures that the state of the motor 2 does not switch frequently and that the door can stop and restart in a timely manner.

[0063] Reference Figure 1 and Figure 2 When the closing stroke of the door leaf has been completed by more than two-thirds, the guide rod 63 that cooperates with the closing drive wheel 31 is first pulled out from the transmission tube 61. Then, the speed of the motor 2 is appropriately reduced. Then, the guide rod 63 that cooperates with the opening drive wheel 32 is inserted into the transmission tube 61 so that the guide wheel 4 can quickly change the direction of movement, thereby opening the door leaf in time to prevent people from colliding with the door leaf again, thus improving the safety of the automatic door during use.

[0064] The implementation principle of a DC brushless motor power device for automatic doors in this application embodiment is as follows: Since the motor 2 rotates the guide wheel 4 through the cooperation between the driving pulley 3 and the driven pulley 5, under the same manufacturing cost, the transmission efficiency of belt drive is higher than that of gear drive. In addition, the noise in the belt drive process is also significantly less than that of gear drive, thereby enabling the DC brushless motor 2 power device to have high transmission efficiency and low noise.

[0065] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A DC brushless motor power unit for automatic doors, characterized in that: include: Main bracket (1), used to connect to the door leaf; The motor (2) is mounted on the main support (1); The drive pulley (3) is connected to the output shaft of the motor (2); The guide wheel (4) is rotatably mounted on the main support (1) and is used to connect with the travel track; The driven pulley (5) is rotatably mounted on the main support (1). The driven pulley (5) is connected to the driving pulley (3). The driven pulley (5) is used to rotate the guide wheel (4). Two drive pulleys (3) are provided, each consisting of a closing drive pulley (31) and an opening drive pulley (32), both of which are rotatably connected to the main support (1). Two driven pulleys (5) are provided, each consisting of a closing driven pulley (51) and an opening driven pulley (52), with the closing driven pulley (51) and the closing drive pulley (31) being open-end drive, and the opening driven pulley (52) and the opening drive pulley (32) being cross-drive. A transmission selection component (6) is provided on the main support (1), which is connected to the output shaft of the motor (2). The transmission selection component (6) is used to enable the motor (2) to drive one of the closing drive pulleys (31) or the opening drive pulley (32) to rotate. The main support (1) is provided with two mounting tubes (11), and the inner side of the mounting tubes (11) is for the components to pass through; the drive pulley (3) includes a mounting part (33) and a transmission part (34), the mounting part (33) is sleeved on the mounting tube (11) by a bearing; the transmission part (34) is exposed outside the mounting tube (11), and the inner diameter of the transmission part (34) is smaller than the inner diameter of the mounting part (33); The inner wall of the transmission part (34) is provided with a slot (341); the transmission selection component (6) includes: The transmission tube (61) is rotatably connected to the main support (1). The transmission tube (61) is connected to the output shaft of the motor (2). The transmission tube (61) passes through the two drive pulleys (3). The transmission tube (61) is provided with a through hole (611). The through hole (611) is located at the position of the transmission part (34). A transmission pin (62) is slidably connected in the through hole (611), and one end of the transmission pin (62) away from the axis of the transmission tube (61) can be inserted into the slot (341). A pin drive is connected to the transmission pin (62). The pin drive is used to slide the transmission pin (62) in and out of the slot (341). The connection between the pin drive and the transmission pin (62) does not interfere with the rotation of the transmission tube (61).

2. The DC brushless motor power unit for automatic doors according to claim 1, characterized in that: The pin drive component includes: A guide rod (63) is slidably connected to the main bracket (1). One end of the guide rod (63) is inserted into the transmission tube (61). The guide rod (63) is provided with an opening guide part (631). The outer wall of the opening guide part (631) is in movable contact with the transmission pin (62). When the transmission pin (62) moves from a position with a smaller cross-sectional area to a larger position, the transmission pin (62) is inserted into the slot (341). A return spring (64) is connected to the transmission pin (62), and the return spring (64) is used to disengage the transmission pin (62) from the slot (341); A transmission telescopic cylinder (65) is mounted on the main support (1), and the piston rod of the transmission telescopic cylinder (65) is connected to the guide rod (63).

3. The DC brushless motor power unit for automatic doors according to claim 2, characterized in that: The output shaft of the motor (2) is connected to a synchronous driving wheel (21); the transmission tube (61) is fitted with a synchronous driven wheel (612), which is connected to the synchronous driving wheel (21); two guide rods (63) are provided, with one end of the two guide rods (63) close to each other and inserted into both ends of the transmission tube (61); two transmission telescopic cylinders (65) are provided, with the piston rod of one transmission telescopic cylinder (65) connected to one guide rod (63).

4. The DC brushless motor power unit for automatic doors according to claim 2, characterized in that: The main support (1) is provided with a tension adjustment assembly (7), which includes: A sliding shaft (71) is slidably mounted on the main support (1), and the sliding shaft (71) can approach the line connecting the driving pulley (3) and the driven pulley (5); The tensioning wheel (72) is rotatably mounted on the sliding shaft (71) and is used to abut against the belt; A tensioning telescopic cylinder (73) is mounted on the main support (1), and the piston rod of the tensioning telescopic cylinder (73) is connected to the sliding shaft (71); A speed sensor (74) is mounted on the main support (1) and is used to detect the rotational speed of the motor (2).

5. The DC brushless motor power unit for automatic doors according to claim 4, characterized in that: The closing drive wheel (31) also includes a blowing section (35) located between the mounting part (33) and the transmission part (34). The blowing section (35) is provided with an annular gas groove (351) and an output channel (352). The annular gas groove (351) is located on the inner wall of the blowing section (35). One end of the output channel (352) is connected to the annular gas groove (351), and the other end is connected to the outer wall of the periphery of the closing drive wheel (31). The main support (1) is provided with an auxiliary pipe (12). The auxiliary pipe (12) is located between the transmission pipe (61) and the mounting part (34). Between the tubes (11), the auxiliary tube (12) is provided with an input channel (13). One end of the input channel (13) is used to connect to an external air source, and the other end is connected to the annular gas groove (351). The main support (1) is provided with a closing resistance sensor (14). When the resistance detected by the closing resistance sensor (14) exceeds a predetermined value, the tension wheel (72) is first moved away from the line connecting the closing drive wheel (31) and the closing driven wheel (51), and then gas is ejected from the output channel (352) to disengage the belt from the closing drive wheel (31).

6. The DC brushless motor power unit for automatic doors according to claim 5, characterized in that: The main support (1) is equipped with a closing stroke detector (15). When the closing stroke of the door leaf is less than one-third and the resistance of the door leaf exceeds a predetermined value, the guide rod (63) will not be pulled out from the transmission tube (61), and the output channel (352) can spray gas. When the closing stroke of the door leaf is more than two-thirds and the resistance of the door leaf exceeds a predetermined value, the transmission selection component (6) first disconnects the motor (2) from the closing drive wheel (31), and then makes the motor (2) drive the opening drive wheel (32) to rotate.

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