Intelligent transmission device

Abstract

The utility model discloses an intelligent transmission device which comprises an upper shell and a lower shell, the lower shell is fixedly connected to the bottom end of the upper shell, the end, away from the upper shell, of the lower shell is fixedly connected with a micro motor, the output end of the micro motor penetrates into the lower shell and is connected with a motor gear, and after the upper shell is connected with the lower shell, the motor gear is connected with the motor gear. A gear set is matched in a cavity formed by the inner space of the upper shell and the inner space of the lower shell, the motor gear is meshed with the input end of the gear set, a threaded hole is formed in the end, away from the lower shell, of the upper shell, a push rod is matched in the threaded hole in a threaded fit mode, and the outer side of the end, with threads, of the push rod is a large-diameter part of the push rod. The transmission device has the advantages of being small in size, low in noise, accurate in stroke control, energy-saving, intelligent in control and the like, and is suitable for metering equipment for metering gas and liquid, control valves, industrial equipment and intelligent household appliances.

Description

Technical Field

[0001] The utility model relates to the technical field of electromechanical automatic control, and particularly relates to an intelligent transmission device. Background Art

[0002] A transmission device is a device that transmits the power of a power source to a working mechanism connected thereto to drive the working mechanism to work, so as to achieve the predetermined purpose of the working mechanism. For example, a structure in which a power source cooperates with a gear reduction box to work.

[0003] However, the existing transmission devices still have the following technical problems: One of them is the accuracy problem of the transmission device during transmission. The transmission accuracy of the transmission device determines its application scope. Especially when the transmission of the transmission device achieves a floating control effect for the working mechanism, such as when connecting to the flow rate of the fluid (liquefied gas, gas, heating, etc.) in the pipeline of the valve on the pipeline, the control of the stroke amount of the transmission device itself is particularly important. If the transmission device cannot achieve high-precision transmission, it will directly affect the floating control effect of the working mechanism connected thereto, resulting in limitations in the applicable scope of the working mechanism connected thereto; The second is the intelligent control problem of the transmission device. The working state of the transmission device needs to be adjusted in a manner that cooperates with manual control, lacking means of intelligent control under non-manual control, and there are still certain defects in the intelligent control of the transmission device; In addition, there is also the problem of the transmission device being used in cooperation with products. When the transmission device is installed in a product and works in cooperation with other components, if the structure of the transmission device itself causes interference to other components in the product or its inherent working characteristics do not match the product effect, it proves that the transmission device has a compatibility problem. Under the current development trends of intelligent products such as miniaturization and low energy consumption, it is still necessary to further improve the transmission device with the above problems. Summary of the Utility Model

[0004] Aiming at the above technical deficiencies, the utility model provides a transmission device with the advantages of small volume, low noise, accurate stroke control, energy saving and intelligent control.

[0005] To achieve the above purpose, the utility model is realized through the following technical solutions:

[0006] The utility model discloses an intelligent transmission device. The transmission device includes an upper housing and a lower housing. The lower housing is fixedly connected to the bottom end of the upper housing. A micro motor is fixedly connected to the end of the lower housing away from the upper housing. The output end of the micro motor penetrates into the lower housing and is connected with a motor gear. After the upper housing is connected to the lower housing, a gear set is fitted in the cavity formed by their internal spaces. The motor gear meshes with the input end of the gear set. A threaded hole is provided at the end of the upper housing away from the lower housing. A push rod that can extend out of the upper housing is fitted in the threaded hole in a threaded fit manner. The outer side of the end of the push rod with threads is the large-diameter part of the push rod. The output end of the gear set meshes with a ring of teeth provided on the edge of the large-diameter part to realize the transmission of the push rod. The micro motor is connected with a control module for controlling its working state. A limiting structure is provided on the end face in the axial direction of the large-diameter part.

[0007] Further, the gear set includes a multi-stage gear and a linkage gear. At least two multi-stage gears are provided in the cavity through a gear shaft. The two ends of the gear shaft are respectively connected in the first fitting holes in the upper housing and the lower housing. Convex columns are provided in both the upper housing and the lower housing. The linkage gear is arranged in the cavity through the cooperation between the through hole in the middle and the convex columns. One of the two adjacent multi-stage gears in the cavity meshes with the linkage gear, and the other multi-stage gear meshes with the motor gear. The linkage gear meshes with the teeth on the edge of the large-diameter part.

[0008] Further, several large-diameter gears and small-diameter gears on the multi-stage gear are distributed in the axial direction of the multi-stage gear in a manner that the radial sizes are different before and after. The two adjacent multi-stage gears in the cavity mesh with each other in a form that their large-diameter gears and small-diameter gears face each other, and the positions of the two in the cavity are misaligned. One of the multi-stage gears meshes with the linkage gear through the small-diameter gear at its axial end, and the other multi-stage gear meshes with the motor gear through the large-diameter gear at its axial end.

[0009] Further, the linkage gear is a double-stage gear. The large-diameter end of the linkage gear meshes with the small-diameter gear of one of the multi-stage gears, and the small-diameter end of the linkage gear meshes with the teeth on the edge of the large-diameter part.

[0010] Further, the part of the push rod located outside the large-diameter part is a connecting rod. A second fitting hole is provided in the lower housing. The part of the connecting rod away from the large-diameter part is fitted in the second fitting hole.

[0011] Further, the end of the upper housing away from the lower housing is a docking end. The docking end is formed by several hook-shaped clamping blocks arranged circumferentially on the end face of the upper housing. The push rod can extend into the space of the docking end inside the clamping blocks.

[0012] Further, the control module includes a single-chip microcomputer, a signal transmitter and a signal receiver. The single-chip microcomputer is electrically connected to the signal transmitter and the signal receiver respectively, and the signal transmitter is electrically connected to the input end of the motor gear.

[0013] Further, the signal receiver is a signal receiver that realizes signal reception through wireless connection with an external intelligent device.

[0014] Further, the limiting structure includes a protrusion A, which is arranged on the end face of the large-diameter part close to the threaded hole side in the axial direction. A limiting rib A is arranged in the upper shell body on the moving path of the protrusion A. An end face A parallel to the end face of the large-diameter part is arranged on the inner wall of the upper shell body outside the threaded hole. There is a gap A between the end face of the large-diameter part where the protrusion A is located and the end face A; when the distance of the gap A reaches the minimum value, the limiting rib A and the protrusion A are in contact with each other, and the length of the push rod extending out of the threaded hole reaches the maximum value.

[0015] Further, the limiting structure further includes a protrusion B, which is arranged on the end face of the large-diameter part far from the threaded hole side in the axial direction. A limiting rib B is arranged in the lower shell body on the moving path of the protrusion B. An end face B parallel to the end face of the large-diameter part is arranged on the inner wall of the lower shell body outside the limiting rib B. There is a gap B between the end face of the large-diameter part where the protrusion B is located and the end face B; when the distance of the gap B reaches the minimum value, the limiting rib B and the protrusion B are in contact with each other, and the length of the push rod extending out of the threaded hole reaches the minimum value.

[0016] The beneficial effects of the present utility model are as follows:

[0017] This transmission device has the characteristics of small volume, which can save space. When it is applied to products, it can create space for the installation of its surrounding components to avoid interference; it uses a micro motor for transmission, achieving a low-noise effect, enhancing the user experience, saving electricity and energy, and cooperating with the multi-stage transmission of the gear set, using a certain transmission ratio to achieve higher transmission accuracy and more accurate control of the stroke of the push rod. Moreover, the limiting structure can ensure that the push rod travels within a specified stroke range, avoiding the phenomenon of push rod jamming caused by the push rod working beyond the stroke; and the push rod that is threaded into the threaded hole rotates under the drive of the gear set to realize its telescopic function and can achieve self-locking of the push rod after power failure; in addition to achieving precise transmission by adopting a structure similar to the cooperation of a power source and a gear reduction box, this transmission device can also realize intelligent control through the control module, without manual adjustment, which is convenient for users to use and is applicable to metering devices for gas and liquid metering, control valves, industrial equipment and smart home appliances. Description of the Drawings

[0018] Figure 1 It is a schematic diagram of the external structure of this transmission device.

[0019] Figure 2 Schematic diagram of the internal structure of the transmission device Figure 1 .

[0020] Figure 3 Schematic diagram of the internal structure of the transmission device Figure 2 .

[0021] Figure 4 Schematic diagram of the internal structure of the transmission device Figure 3 .

[0022] Figure 5 Exploded view of the components of the transmission device.

[0023] Figure 6 Schematic diagram of the structure of the gear set during the assembly of the transmission device.

[0024] Figure 7 Schematic diagram of the structure of the control module.

[0025] Figure 8 Schematic diagram of the structure of the push rod.

[0026] Figure 9 Schematic diagram of the structure of the limit rib A and the end face A.

[0027] Figure 10 Schematic diagram of the structure of the limit rib B and the end face B.

[0028] Figure 11 Schematic diagram of the internal structure of the transmission device when the length of the push rod extending out of the threaded hole reaches the maximum value.

[0029] Figure 12 Schematic diagram of the internal structure of the transmission device when the length of the push rod extending out of the threaded hole reaches the minimum value.

[0030] In the figure, 1. upper housing; 11. threaded hole; 12. docking end; 121. clamping block; 13. limit rib A; 14. end face A; 2. lower housing; 21. second mating hole; 22. limit rib B; 23. end face B; 3. micro motor; 4. motor gear; 5. cavity; 6. gear set; 61. multi-stage gear; 611. large-diameter gear; 612. small-diameter gear; 613. gear shaft; 62. linkage gear; 621. through hole; 622. large-diameter end; 623. small-diameter end; 7. push rod; 71. large-diameter part; 72. connecting rod; 73. limit structure; 731. protrusion A; 732. protrusion B; 733. gap A; 734. gap B; 8. control module; 81. single-chip microcomputer; 82. signal transmitter; 83. signal receiver; 9. first mating hole; 10. convex column. Specific embodiments

[0031] The utility model discloses an intelligent transmission device, as Figures 1 - 8 As shown in combination, the transmission device includes an upper housing 1 and a lower housing 2. The lower housing 2 is fixedly connected to the bottom end of the upper housing 1. A micro motor 3 is fixedly connected to the end of the lower housing 2 away from the upper housing 1. The output end of the micro motor 3 penetrates into the lower housing 2 and is connected to a motor gear 4. After the upper housing 1 is connected to the lower housing 2, a gear set 6 is fitted in the cavity 5 formed by the internal spaces of the two. The motor gear 4 meshes with the input end of the gear set 6. A threaded hole 11 is provided at the end of the upper housing 1 away from the lower housing 2. A push rod 7 that can extend outside the upper housing 1 is fitted in the threaded hole 11 in a threaded fit manner. The outer side of the threaded end of the push rod 7 is the large-diameter part 71 of the push rod 7. The output end of the gear set 6 meshes with a ring of teeth provided on the edge of the large-diameter part 71 to realize the transmission of the push rod 7. The micro motor 3 is connected to a control module 8 for controlling its working state. A limiting structure 73 is provided on the end face in the axial direction of the large-diameter part.

[0032] It should be noted that the transmission device adopts a structure similar to that of a power source cooperating with a gear reduction box to achieve precise transmission. During operation, the micro motor 3 drives the gear set 6 through the motor gear 4. The push rod 7 forms a transmission structure with the gear set 6 through a ring of teeth provided on the edge of its large-diameter part 71, rotates under the drive of the gear set 6, and expands and contracts at the end of the upper housing 1 away from the lower housing 2. Additionally, the transmission device has the characteristics of a small volume, which can save space, and can create space for the installation of its surrounding components when applied, avoiding interference. The use of a micro motor for transmission can achieve a low-noise effect, enhance the user experience, save electricity and energy, and with the multi-stage transmission of the gear set, a high transmission accuracy can be achieved with a certain transmission ratio, and the stroke control of the push rod is more accurate. The push rod fitted in the threaded hole by thread rotates under the drive of the gear set to realize its expansion and contraction function, and can achieve self-locking of the push rod after power-off. It can also achieve intelligent control through the control module, without manual adjustment, which is convenient for users to use, and is applicable to metering devices for gas and liquid metering, control valves, industrial equipment, and smart home appliances.

[0033] When the transmission device is used as a flow regulating device in smart home products, the end of the upper housing 1 away from the lower housing 2 will be docked with a ball valve. After receiving the control instruction from the control module 8, the micro motor 3 in the transmission device drives the push rod 7 to work. By the telescopic action of the push rod 7, the size control of the opening of the internal switch end of the ball valve and the control of the closing of the switch end are realized, so as to control the flow of fluids such as liquefied gas, gas, and heating in the pipeline connected to the ball valve; it can also be connected to an external intelligent device through the control module 8 to realize the function of automatically controlling the pipeline flow. For example, in the heating supply in the north in winter, the indoor temperature is set at 25°C. When the indoor temperature reaches 25°C, the external intelligent device can control the transmission device to push out the push rod 7 to make the opening of the ball valve smaller, and the heating flow in the pipeline also decreases accordingly, so that the indoor temperature remains constant; when the indoor temperature is lower than 25°C, the transmission device will drive the push rod 7 to retract, and the opening of the ball valve becomes larger, so that the heating flow in the pipeline increases, and the indoor temperature rises to reach the set temperature value. After the indoor temperature reaches 25°C, the transmission device stops working, controls the indoor temperature to be constant, improves the home comfort, and at the same time realizes the automatic control of smart home products, which is convenient to operate and energy-saving and emission-reducing.

[0034] As a further preference of the above embodiment, as Figures 2 - 6 As shown in combination, the gear set 6 includes a multi-stage gear 61 and a linkage gear 62. At least two multi-stage gears 61 are provided in the cavity 5 through a gear shaft 613. The two ends of the gear shaft 613 are respectively connected to the first mating holes 9 in the upper housing 1 and the lower housing 2. Convex columns 10 are provided in both the upper housing 1 and the lower housing 2. The linkage gear 62 is arranged in the cavity 5 through the cooperation between the through hole 621 in the middle and the convex column 10. One of the two multi-stage gears 61 adjacent to each other in the cavity 5 meshes with the linkage gear 62, and the other multi-stage gear 61 meshes with the motor gear 4. The linkage gear 62 meshes with the teeth on the edge of the large-diameter part 71.

[0035] Among them, when installing the multi-stage gear 61, the gear shaft 613 can be first inserted into the middle of the multi-stage gear 61, and then one end of the gear shaft 613 is inserted into the first mating hole 9 to position the multi-stage gear 61. Meshing is formed between two adjacent multi-stage gears 61, between one multi-stage gear 61 and the motor gear 4, and between another multi-stage gear 61 and the linkage gear 62. Then, the linkage gear 62 is installed into the upper housing 1 or the lower housing 2 along the direction in which the through hole 621 mates with the convex column 10. Finally, the upper housing 1 and the lower housing 2 are fitted together, so that the other end of the gear shaft 613 is inserted into the first mating hole 9 and the through hole 621 at the other end of the linkage gear 62 is fitted to another convex column 10, thereby realizing the operation of fitting the multi-stage gear 61 and the linkage gear 62 in the cavity 5. When the micro motor 3 works, the motor gear 4 drives one of the multi-stage gears 61, then the meshing between the two multi-stage gears 61 drives, and then the meshing between another multi-stage gear 61 and the linkage gear 62 drives. Finally, the meshing between the large-diameter part 71 on the push rod 7 and the linkage gear 62 drives, so that the push rod 7 realizes telescoping. The transmission ratios of all the gears in the transmission device are adjusted through the motor gear 4, the multi-stage gear 61, the linkage gear 62, and the large-diameter part 71, realizing the adjustment of the rotation action amplitude of the push rod 7, thereby controlling the telescoping length of the push rod 7 and achieving the purpose of accurately controlling the stroke of the push rod 7.

[0036] Preferably, as Figures 2 - 6 shown, several large-diameter gears 611 and small-diameter gears 612 on the multi-stage gear 61 are sequentially distributed in the axial direction of the multi-stage gear 61 in a manner of different front and rear radial sizes. Two adjacent multi-stage gears 61 in the cavity 5 are meshed in a form where their large-diameter gears 611 and small-diameter gears 612 face each other, and the position misalignment of the two in the cavity 5 is realized. One of the multi-stage gears 61 is meshed with the linkage gear 62 through the small-diameter gear 612 at its axial end, and another multi-stage gear 61 is meshed with the motor gear 4 through the large-diameter gear 611 at its axial end.

[0037] Among them, after two adjacent multi-stage gears 61 are meshed in a form where their large-diameter gears 611 and small-diameter gears 612 face each other, and one of the multi-stage gears 61 is meshed with the linkage gear 62, the transmission ratio can be adjusted by the different tooth numbers of the two. After the large-diameter gear 611 on another multi-stage gear 61 is meshed with the motor gear 4, the transmission ratio can also be adjusted by the different tooth numbers of the two. Thus, the transmission ratio is adjusted through the two multi-stage gears 61 and the linkage gear 62 and the motor gear 4 connected thereto, and further the transmission ratios of the gears used for transmission in the transmission device are adjusted, achieving the effect of further adjusting the stroke amount of the push rod 7.

[0038] Preferably, as Figure 2 , Figure 4 and Figure 6 shown in combination, the linkage gear 62 is a double gear. The large-diameter end 622 of the linkage gear 62 meshes with the small-diameter gear 612 of one of the multi-gears 61, and the small-diameter end 623 of the linkage gear 62 meshes with the teeth on the edge of the large-diameter part 71.

[0039] Among them, through the tooth number difference between the large-diameter end 622 on the linkage gear 62 and the teeth of the small-diameter gear 612 of one of the multi-gears 61, and the tooth number difference between the small-diameter end 623 on the linkage gear 62 and the teeth on the edge of the large-diameter part 71, the transmission ratio of the gears used for transmission in the transmission device is further adjusted to achieve the purpose of further adjusting the stroke of the push rod 7, making the stroke of the push rod 7 more accurate.

[0040] As a further preference of the above embodiment, as Figure 2 shown, the part of the push rod 7 located outside the large-diameter part 71 is the connecting rod 72. A second fitting hole 21 is provided in the lower housing 2, and the part of the connecting rod 72 away from the large-diameter part 71 is fitted in the second fitting hole 21.

[0041] Among them, since there is a possibility of position deviation when the push rod 7 expands and contracts by rotation, a connecting rod 72 is provided at the end of the push rod 7. The cooperation between the connecting rod 72 and the second fitting hole 21 improves the stability of the push rod 7 during rotation. It can not only avoid the influence on the control of the opening size of the internal switch end of the ball valve and the control of the closing of the switch end caused by the deviation of the push rod 7, but also avoid the situation where both the push rod 7 and the second fitting hole 21 are damaged due to position deviation during the rotation of the push rod 7.

[0042] As a further preference of the above embodiment, as Figure 1 , Figure 2 and Figure 5 shown in combination, the end of the upper housing 1 away from the lower housing 2 is the docking end 12. The docking end 12 is formed by a plurality of hook-shaped clamping blocks 121 arranged circumferentially along the end face of the upper housing 1. The push rod 7 can extend into the space of the docking end 12 inside the clamping blocks 121.

[0043] Among them, when installing the transmission device, it can be clamped to the outer shell of the ball valve through the clamping blocks 121, so as to achieve the effect of connecting the upper housing 1 to the outer shell of the ball valve, and then connecting the transmission device to the ball valve, realizing that the transmission device controls the opening size of the internal switch end of the ball valve and the closing operation of the switch end by using the push rod 7.

[0044] As a further preference of the above embodiment, as Figure 7As shown, the control module 8 includes a single-chip microcomputer 81, a signal transmitter 82, and a signal receiver 83. The single-chip microcomputer 81 is electrically connected to the signal transmitter 82 and the signal receiver 83 respectively, and the signal transmitter 82 is electrically connected to the input end of the motor gear 4.

[0045] It should be noted that after the transmission device is installed inside the smart home product, the control instructions and data are transmitted through the communication connection between the external smart device and the signal receiver 83. Then, the signal receiver 83 transmits the control instructions to the single-chip microcomputer 81 for processing and data storage. Then, the single-chip microcomputer 81 sends an electrical signal to the signal transmitter 82, and the signal transmitter 82 sends an electrical signal to the micro-motor 3, so as to intelligently adjust the working states such as the start / stop, rotation direction, and rotation speed of the micro-motor 3, realizing the automatic control of the transmission device without manual adjustment.

[0046] Preferably, as Figure 7 shown, the signal receiver 83 is a signal receiver 83 that realizes signal reception through wireless connection with an external smart device.

[0047] Among them, external smart devices such as wireless controllers and mobile phones perform wireless communication connections through Bluetooth connection or WIFI connection, so as to realize the wireless transmission of control signals and data, further facilitating user use and achieving better intelligent control effects of the transmission device.

[0048] As a further preference of the above embodiment, as Figure 6 、 Figure 8 、 Figure 9 and Figure 11 shown in combination, the limiting structure 73 includes a protrusion A731. The protrusion A731 is arranged on the end face of the large-diameter part 71 close to the threaded hole 11 side in the axial direction. A limiting rib A13 is provided in the upper shell 1 located in the moving path of the protrusion A731. The inner wall of the upper shell 1 outside the threaded hole 11 is provided with an end face A14 parallel to the end face of the large-diameter part 71. There is a gap A733 between the end face of the large-diameter part 71 where the protrusion A731 is located and the end face A14. When the distance of the gap A733 reaches the minimum value, the limiting rib A13 and the protrusion A731 are in contact with each other, and the length of the push rod 7 extending out of the threaded hole 11 reaches the maximum value.

[0049] During the process of the push rod 7 extending out of the threaded hole 11, if the end face of the large-diameter portion 71 close to the threaded hole 11 contacts the end face A14, as the push rod 7 continuously performs the action of extending out of the threaded hole 11, the frictional force between the end face of the large-diameter portion 71 close to the threaded hole 11 and the end face A14 will increase, and when the push rod 7 is retracted in the reverse direction, the phenomenon of the push rod 7 getting stuck will occur; therefore, when the protrusion A731 contacts the limiting rib A13 during the rotation of the push rod 7 and extending out of the threaded hole 11, at this time, the length of the push rod 7 extending out of the threaded hole 11 reaches the maximum value, and the contact between the protrusion A731 and the limiting rib A13 limits the push rod 7 in the extending direction, preventing the push rod 7 from further extending out of the threaded hole 11. The gap A733 that still exists between the end face of the large-diameter portion 71 close to the threaded hole 11 and the end face A14 can avoid the phenomenon of the push rod 7 getting stuck and ensure the normal movement of the push rod 7.

[0050] Preferably, as Figure 4 、 Figure 8 、 Figure 10 and Figure 12 Combined as shown, the limiting structure 73 further includes a protrusion B732. The protrusion B732 is provided on the end face of the large-diameter portion 71 in the axial direction away from the threaded hole 11 side. In the lower housing 2, there is a limiting rib B22 located in the moving path of the protrusion B732. On the inner wall of the lower housing 2 outside the limiting rib B22, there is an end face B23 parallel to the end face of the large-diameter portion 71. There is a gap B734 between the end face of the large-diameter portion 71 where the protrusion B732 is located and the end face B23; when the distance of the gap B734 reaches the minimum value, the limiting rib B22 and the protrusion B732 are in contact with each other, and the length of the push rod 7 extending out of the threaded hole 11 reaches the minimum value.

[0051] During the process of the push rod 7 retracting into the threaded hole 11, if the end face of the large-diameter portion 71 away from the threaded hole 11 contacts the end face B23, as the push rod 7 continuously performs the action of retracting into the cavity 5, the frictional force between the end face of the large-diameter portion 71 away from the threaded hole 11 and the end face B23 will increase, and when the push rod 7 is extended in the reverse direction, the phenomenon of the push rod 7 getting stuck will occur; therefore, when the protrusion B732 contacts the limiting rib B22 during the rotation of the push rod 7 and retracting into the cavity 5, at this time, the length of the push rod 7 retracting into the cavity 5 reaches the maximum value, and the contact between the protrusion B732 and the limiting rib B22 limits the push rod 7 in the retracting direction, preventing the push rod 7 from further retracting into the cavity 5. The gap B734 that still exists between the end face of the large-diameter portion 71 away from the threaded hole 11 and the end face B23 can avoid the phenomenon of the push rod 7 getting stuck and ensure the normal movement of the push rod 7.

[0052] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment contains only an independent technical solution. This narrative style of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An intelligent transmission device, comprising an upper housing and a lower housing, wherein the lower housing is fixedly connected to the bottom end of the upper housing, characterized in that: A micro motor is fixedly connected to the end of the lower shell away from the upper shell, and the output end of the micro motor passes through the lower shell and is connected to a motor gear. After the upper shell is connected to the lower shell, a gear set is matched in the cavity formed by the internal space of the two, and the motor gear is meshed with the input end of the gear set. A threaded hole is provided at the end of the upper shell away from the lower shell, and a push rod that can extend out of the upper shell is threadedly matched in the threaded hole. The outer side of the threaded end of the push rod is the large diameter part of the push rod, and the output end of the gear set is meshed with a circle of gear teeth provided on the edge of the large diameter part to realize the transmission of the push rod. The micro motor is connected to a control module for controlling its working state, and a limiting structure is provided on the end face of the large diameter part in the axial direction.

2. The transmission device according to claim 1, characterized in that: The gear set includes multi-linked gears and linkage gears. At least two multi-linked gears are arranged in the cavity through a gear shaft. The two ends of the gear shaft are respectively connected to the first matching holes in the upper shell and the lower shell. Both the upper shell and the lower shell are provided with convex columns. The linkage gear is arranged in the cavity through the cooperation between the through hole in the middle and the convex column. One of the two multi-linked gears in adjacent positions in the cavity is meshed with the linkage gear, and the other multi-linked gear is meshed with the motor gear. The linkage gear is meshed with the gear teeth on the edge of the large diameter part.

3. The transmission device according to claim 2, characterized in that: The plurality of large-diameter gears and small-diameter gears on the multi-stage gear are distributed in the axial direction of the multi-stage gear in a manner of different front-to-rear radial sizes. Two adjacent multi-stage gears in the cavity are meshed with each other in the form of large-diameter gears and small-diameter gears facing each other, and the positions of the two are staggered in the cavity. One of the multi-stage gears is meshed with the linkage gear through the small-diameter gear at its axial end, and the other multi-stage gear is meshed with the motor gear through the large-diameter gear at its axial end.

4. The transmission device according to claim 3, characterized in that: The linkage gear is a double gear, the large diameter end of the linkage gear is meshed with the small diameter gear of one of the multi-link gears, and the small diameter end of the linkage gear is meshed with the gear teeth on the edge of the large diameter portion.

5. The transmission device according to claim 1, characterized in that: The part of the push rod located outside the large diameter portion is a connecting rod. A second matching hole is provided in the lower shell body, and the part of the connecting rod away from the large diameter portion is matched in the second matching hole.

6. The transmission device according to claim 1, characterized in that: The end of the upper shell away from the lower shell is a docking end, which is formed by a plurality of hook-shaped clamping blocks arranged circumferentially along the end surface of the upper shell, and the push rod can extend into the docking end space inside the clamping block.

7. The transmission device according to claim 1, characterized in that: The control module includes a single chip microcomputer, a signal transmitter and a signal receiver. The single chip microcomputer is electrically connected to the signal transmitter and the signal receiver respectively, and the signal transmitter is electrically connected to the input end of the motor gear.

8. The transmission device according to claim 7, characterized in that: The signal receiver is a signal receiver that realizes signal reception through wireless connection with an external smart device.

9. The transmission device according to claim 1, characterized in that: The limiting structure includes a protrusion A, which is arranged on the end face of the large diameter portion close to the threaded hole in the axial direction of the large diameter portion. A limiting rib A located in the moving path of the protrusion A is provided in the upper shell body. An end face A parallel to the end face of the large diameter portion is provided on the inner wall of the upper shell body outside the threaded hole. A gap A is provided between the end face of the large diameter portion where the protrusion A is located and the end face A. When the distance of the gap A reaches a minimum value, the limiting rib A and the protrusion A offset each other, and the length of the push rod extending out of the threaded hole reaches a maximum value.

10. The transmission device according to claim 9, characterized in that: The limiting structure also includes a protrusion B, which is arranged on the end face of the large diameter part away from the threaded hole side in the axial direction of the large diameter part. A limiting rib B is provided in the lower shell body and is located in the moving path of the protrusion B. The inner wall of the lower shell body outside the limiting rib B is provided with an end face B parallel to the end face of the large diameter part. A gap B is provided between the end face of the large diameter part where the protrusion B is located and the end face B. When the distance of the gap B reaches the minimum value, the limiting rib B and the protrusion B offset each other, and the length of the push rod extending out of the threaded hole reaches the minimum value.

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