CN212252831U

CN212252831U - Heating temperature balance adjustment executor

Info

Publication number: CN212252831U
Application number: CN202021027029.6U
Authority: CN
Inventors: 蔡善良; 乔佩
Original assignee: Yuhuan Zhongliang Fluid Intelligent Control Co ltd
Current assignee: Yuhuan Zhongliang Fluid Intelligent Control Co ltd
Priority date: 2020-06-05
Filing date: 2020-06-05
Publication date: 2020-12-29
Anticipated expiration: 2030-06-05

Abstract

The utility model provides a heating temperature balance adjustment executor belongs to executor technical field. The actuator solves the problems that the existing actuator has incomplete functions and influences the service life. This heating temperature balance adjustment executor, including the executor body, be provided with manual-automatic adjustment mechanism on this executor body, the executor body comprises last casing and lower casing, it is connected through the connecting partition board with casing down to go up the casing, be equipped with the motor that has the temperature sensing function in going up the casing, the internal multiunit that is provided with of inferior valve drives the double-deck speed reduction drive gear of mutual transmission by this motor, but the control knob that the casing was equipped with hand-operated rotation outward, through the shell fragment that can play the buffering effect of making an uproar of falling between double-deck speed reduction drive gear and the connecting partition board. The utility model has the advantages of the moment of torsion is little, fall and make an uproar and improve life.

Description

Heating temperature balance adjustment executor

Technical Field

The utility model belongs to the technical field of the executor, a executor is related to, in particular to heating temperature balance adjusts executor.

Background

The actuator is an essential important component of an automatic control system. It is used to receive the control signal from the controller and change the size of the controlled medium to maintain the controlled variable at the required value or in certain range.

The actuator has a wide application range, wherein the actuator in the heating room is used for adjusting the indoor temperature and adjusting the temperature to a value set by a user for the user to experience. However, the existing actuators have some problems in terms of functions in terms of control and internal structures:

the existing actuators are divided into a manual mode and an electric (automatic) mode from the aspect of operation and control, but the actuators integrating the manual mode and the automatic mode are rarely provided;

in addition, functionally, for example, when a user adjusts the room temperature to a set value by an actuator, and the user needs to close the heating facility by the actuator after a period of time, the existing actuator does not have a function of maintaining a constant state for a value set by the user after the user closes the heating facility, so that when the heating facility is closed by the existing actuator, the entire room temperature starts to decrease, and the user experience is reduced;

finally, from the aspect of internal structure, friction is generated between the gear structure in the existing actuator and the shell or the related plastic parts in the shell, so that the noise is high, the abrasion is fast, and the service life is influenced.

Disclosure of Invention

The utility model aims at providing a moment of torsion is little, fall and fall the heating temperature balance adjustment executor that makes an uproar and improve life to the above-mentioned problem that exists among the prior art.

The purpose of the utility model can be realized by the following technical proposal: a heating temperature balance adjustment actuator is characterized by comprising an actuator body, wherein a manual and automatic adjustment mechanism is arranged on the actuator body, manual and automatic operation switching of the actuator body is realized through the manual and automatic adjustment mechanism, the actuator body consists of an upper shell and a lower shell, the upper shell and the lower shell are connected through a connecting partition plate, a motor with a temperature sensing function is arranged in the upper shell, a plurality of groups of double-layer reduction transmission gears which are driven by the motor to mutually transmit are arranged in the lower shell, a control knob which can manually rotate is arranged outside the upper shell, a fixed rotating shaft which is fixedly connected with the control knob and driven by the control knob to rotate is further arranged in the upper shell, the fixed rotating shaft penetrates through the connecting partition plate and extends into the lower shell, and a gear rotating shaft with an outer gear is sleeved on the fixed rotating shaft, the outer gear on the gear rotating shaft is meshed with the double-layer reduction transmission gear, one end of the gear rotating shaft is located in the upper shell, the end of the gear rotating shaft is connected with the control knob in a spline fit mode, the other end of the gear rotating shaft is located in the lower shell, the end of the gear rotating shaft is connected with the fixed rotating shaft in a multi-layer spline sleeve fit mode, the connecting partition plate is provided with a fixing through hole for the gear rotating shaft to pass through, and the double-layer reduction transmission gear and the connecting partition plate are provided with elastic pieces capable of playing.

In the above heating temperature balance adjustment actuator, the end face of the connecting partition plate facing the lower shell direction is provided with two extending seats which extend outwards and protrude in the axial direction, fixed shafts are fixedly connected in the two extending seats, and the fixed shafts penetrate out of the extending seats and extend into the corresponding double-layer reduction transmission gears to be connected with the double-layer reduction transmission gears in a matching manner.

In the above heating temperature balance adjustment actuator, the two-layer reduction transmission gears are four groups, the four groups of two-layer reduction transmission gears are respectively a first two-layer reduction transmission gear, a second two-layer reduction transmission gear, a third two-layer reduction transmission gear and a fourth two-layer reduction transmission gear, the two fixed shafts are respectively a first fixed shaft and a second fixed shaft, the first two-layer reduction transmission gear and the second two-layer reduction transmission gear are alternately sleeved on the first fixed shaft, and the third two-layer reduction transmission gear and the fourth two-layer reduction transmission gear are alternately sleeved on the second fixed shaft.

In the above heating temperature balance adjustment actuator, the first double-layer reduction transmission gear, the second double-layer reduction transmission gear, the third double-layer reduction transmission gear and the fourth double-layer reduction transmission gear are all formed by integrally combining a large-diameter gear and a small-diameter gear, the small-diameter gear in the first double-layer reduction transmission gear is meshed with the large-diameter gear in the third double-layer reduction transmission gear, the small-diameter gear in the third double-layer reduction transmission gear is meshed with the large-diameter gear in the second double-layer reduction transmission gear, the small-diameter gear in the second double-layer reduction transmission gear is meshed with the large-diameter gear in the fourth double-layer reduction transmission gear, and the first return spring is further sleeved at the tail end of the first fixed shaft.

In the above actuator for adjusting the heating temperature balance, the external gear on the gear rotating shaft is engaged with the small-diameter gear in the fourth double-layer reduction transmission gear.

In the above heating temperature balance adjustment actuator, a movable space is provided between the second double-layer reduction transmission gear and the fourth double-layer reduction transmission gear.

In the above heating temperature balance adjustment actuator, the manual-automatic adjustment mechanism includes a main shaft extending from the inside of the upper housing to the inside of the lower housing, a fixing rod is convexly disposed at a position of the bottom wall of the lower housing corresponding to the main shaft, an upper end of the fixing rod extends into the main shaft, a second return spring is sleeved on the fixing rod, one end of the second return spring abuts against the bottom of the main shaft, the other end of the second return spring abuts against the bottom wall of the lower housing, the main shaft can vertically move along the outer wall of the fixing rod, a push rod is disposed on the outer peripheral wall of the main shaft and between the first double-layer reduction transmission gear and the second double-layer reduction transmission gear, the push rod extends to a position between the first double-layer reduction transmission gear and the second double-layer reduction transmission gear and abuts against the surface of the large-diameter gear in the second double-layer reduction, the automatic manual adjusting mechanism further comprises a pressing shaft sleeve which is arranged in the position upper shell and used for driving the main shaft to vertically move along the outer wall of the fixing rod, wherein the top of the pressing shaft sleeve is provided with a pressing part for a user to press by hand, and the pressing part is exposed out of the position upper shell.

In the above heating temperature balance adjustment actuator, the upper shell and the lower shell are in clamping fit through the connecting partition plate.

In the above heating temperature balance adjustment actuator, the end of the connecting partition plate facing the upper casing is provided with a fixing plate for fixing the gear rotating shaft, the peripheral wall of the bottom of the motor symmetrically extends outwards to form a connecting part, and the connecting part is connected with the connecting partition plate through a fixing bolt.

In the above heating temperature balance adjustment actuator, the spring plate comprises a spring plate body and bent pieces integrally connected to two ends of the spring plate body, the two bent pieces are bent and respectively abutted against the end faces of the large-diameter gears in the first double-layer reduction transmission gear and the third double-layer reduction transmission gear, the spring plate body is connected with the connecting partition plate through the connecting bolt, and the end part of the connecting partition plate is provided with a plurality of limiting lugs for limiting the spring plate body.

Compared with the prior art, this heating temperature balance adjustment executor passes through manual or automatic switching of manual automatic regulating mechanism realization, select corresponding mode to open this executor under the different environment of different crowds, multistage double-deck reduction gear's mutual transmission in this executor simultaneously, the moment of torsion is little, installing of shell fragment prevents the friction that produces between gear and the connection baffle and other plastic component in addition, reduce the friction loss, improve life, the effect of making an uproar falls has, the external temperature can be responded to in the setting of motor in this executor, can also play the temperature numerical value that sets for to the user when the user closes this executor and keep invariable state, whole indoor temperature can not descend, user's use experience has been improved.

Drawings

Fig. 1 is a schematic perspective view of the heating temperature balance adjustment actuator.

Fig. 2 is a schematic view of the heating temperature balance adjustment actuator with the upper and lower cases removed.

Fig. 3 is an exploded view of the upper housing, the connecting barrier, and the lower housing in the heating temperature balance adjustment actuator.

Fig. 4 is a schematic view showing a structure of a connection spacer in the heating temperature balance adjustment actuator.

Fig. 5 is a schematic view showing a structure of a connection spacer in the heating temperature balance adjustment actuator.

In the figure, 1, an actuator body; 2. a manual automatic adjustment mechanism; 3. an upper housing; 4. a lower housing; 5. connecting the partition boards; 6. a motor; 7. a control knob; 8. fixing the rotating shaft; 9. an outer gear; 10. a gear shaft; 11. an extension base; 12. a first double reduction transmission gear; 13. a second double reduction drive gear; 14. a third double-layer reduction transmission gear; 15. a fourth double-layer reduction transmission gear; 16. a first fixed shaft; 17. a second fixed shaft; 18. a large-diameter gear; 19. a small diameter gear; 20. a first return spring; 21. an active interval; 22. a main shaft; 23. fixing the rod; 24. a second return spring; 25. a push rod; 26. pushing the circular truncated cone; 27. pressing the shaft sleeve; 28. a pressing part; 29. a fixing plate; 30. a connecting portion; 31. fixing the bolt; 32. a spring plate body; 33. bending the sheet; 34. a connecting bolt; 35. a limiting bump; 36. clamping convex; 37. a clamping block; 38. a card slot; 39. a clamping groove; 40. a clamping block; 41. and (4) a groove.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

As shown in fig. 1, fig. 2, fig. 3, fig. 4 and fig. 5, the heating temperature balance adjusting actuator comprises an actuator body 1, wherein a manual/automatic adjusting mechanism 2 is arranged on the actuator body 1, manual/automatic operation switching of the actuator body 1 is realized through the manual/automatic adjusting mechanism 2, the actuator body 1 is composed of an upper shell 3 and a lower shell 4, the upper shell 3 and the lower shell 4 are connected through a connecting partition plate 5, a motor 6 with a temperature sensing function is arranged in the upper shell 3, a plurality of groups of double-layer reduction transmission gears driven by the motor 6 to mutually transmit are arranged in the lower shell 4, a control knob 7 capable of manually rotating is arranged outside the upper shell 3, a fixed rotating shaft 8 fixedly connected with the control knob 7 and driven by the control knob 7 to rotate is also arranged in the upper shell 3, the fixed rotating shaft 8 penetrates through the connecting partition plate 5 and extends into the lower shell 4, a gear rotating shaft 10 with an external gear 9 is sleeved on, the external gear 9 on the gear rotating shaft 10 is engaged with the double-layer reduction transmission gear, one end of the gear rotating shaft 10 is positioned in the upper shell 3, the end part of the end is in spline fit connection with the control knob 7, the other end of the gear rotating shaft is positioned in the lower shell 4, the end part of the end is in fit connection with the fixed rotating shaft 8 through a multilayer spline sleeve, the connecting partition plate 5 is provided with a fixed through hole for the gear rotating shaft 10 to pass through, the external gear 9 on the gear rotating shaft 10 is engaged with the small-diameter gear 19 in the fourth double-layer reduction transmission gear 15, a spring sheet capable of playing a role in buffering and noise reduction is arranged between the double-layer reduction transmission gear and the connecting partition plate 5, if a room temperature of 25 ℃ is needed in a heating room, after a user enters the heating room and opens the heating equipment through the actuator, the heating equipment starts to heat until the room temperature, the actuator is inserted with electric wires, the end face of the connecting baffle plate 5 facing to the lower shell 4 is provided with two extending seats 11 extending outwards and axially, fixed shafts are fixedly connected in the two extending seats 11, penetrate out of the extending seats 11 and extend into the corresponding double-layer reduction transmission gears to be matched and connected with the double-layer reduction transmission gears, the double-layer reduction transmission gears are four groups, the four groups of double-layer reduction transmission gears are respectively a first double-layer reduction transmission gear 12, a second double-layer reduction transmission gear 13, a third double-layer reduction transmission gear 14 and a fourth double-layer reduction transmission gear 15, the two fixed shafts are respectively a first fixed shaft 16 and a second fixed shaft 17, the first double-layer reduction transmission gear 12 and the second double-layer reduction transmission gear 13 are sleeved on the first fixed shaft 16 at intervals, the third double-layer reduction transmission gear 14 and the fourth double-layer reduction transmission gear 15 are sleeved on the second fixed shaft 17 at intervals, the first double-layer reduction transmission gear 12, the second double-layer reduction transmission gear 13, the third double-layer reduction transmission gear 14 and the fourth double-layer reduction transmission gear 15 are formed by integrally combining a large-diameter gear 18 and a small-diameter gear 19, the small-diameter gear 19 in the first double-layer reduction transmission gear 12 is meshed with the large-diameter gear 18 in the third double-layer reduction transmission gear 14, the small-diameter gear 19 in the third double-layer reduction transmission gear 14 is meshed with the large-diameter gear 18 in the second double-layer reduction transmission gear 13, the small-diameter gear 19 in the second double-layer reduction transmission gear 13 is meshed with the large-diameter gear 18 in the fourth double-layer reduction transmission gear 15, and the first return spring 20 is further sleeved at the.

As shown in fig. 4, the elastic sheet is composed of an elastic sheet body 32 and bent sheets 33 integrally connected to two ends of the elastic sheet body 32, the two bent sheets 33 are bent and respectively abutted against the end faces of the large-diameter gear 18 in the first double-layer reduction transmission gear 12 and the third double-layer reduction transmission gear 14, the elastic sheet body 32 is connected with the connecting partition plate 5 through a connecting bolt 34, the end part of the connecting partition plate 5 is provided with a plurality of limiting lugs 35 for limiting the elastic sheet body 32, when the actuator works, the mutual transmission of the plurality of groups of double-layer reduction transmission gears generates vibration, the vibration is transmitted to the connecting partition plate 5 through a fixed shaft, the connecting partition plate 5 can relatively vibrate, then the connecting partition plate 5 may generate certain abrasion with the upper shell 3 and the lower shell 4, the elastic sheet is additionally arranged inside, and the bent sheets 33 in the elastic sheet abut against the corresponding double-layer, the elastic sheet body 32 is fixedly connected with the connecting partition plate 5, so that the connecting strength is correspondingly enhanced, a good stabilizing effect is achieved in the transmission process of the double-layer reduction transmission gear according to the trial and error of the applicant, and the noise reduction effect is achieved.

In more detail, a movable space 21 is provided between the second double-layer reduction transmission gear 13 and the fourth double-layer reduction transmission gear 15, the manual and automatic adjusting mechanism 2 includes a main shaft 22 extending from the inside of the upper housing 3 to the inside of the lower housing 4, a fixing rod 23 is convexly provided at a position corresponding to the main shaft 22 on the inner bottom wall of the lower housing 4, an upper end of the fixing rod 23 extends into the main shaft 22, a second return spring 24 is sleeved on the fixing rod 23, one end of the second return spring 24 abuts against the bottom of the main shaft 22, the other end of the second return spring abuts against the inner bottom wall of the lower housing 4, the main shaft 22 can vertically move along the outer wall of the fixing rod 23, a push rod 25 is provided on the outer peripheral wall of the main shaft 22 and located between the first double-layer reduction transmission gear 12 and the second double-layer reduction transmission gear 13, the push rod 25 extends to an area between the first double-layer reduction transmission gear 12 and the second double-layer reduction transmission gear 13 The manual-automatic adjusting mechanism 2 further comprises a pressing shaft sleeve 27 which is arranged in the upper housing 3 and wraps the spindle 22 in the upper housing and is used for driving the spindle 22 to vertically move along the outer wall of the fixing rod 23, a pressing portion 28 which is pressed by a hand of a user is arranged at the top of the pressing shaft sleeve 27, the pressing portion 28 is exposed out of the upper housing 3, the pressing shaft sleeve 27 drives the spindle 22 to press downwards through pressing the pressing portion 28, the spindle 22 descends along the outer wall of the fixing rod 23, the return spring II 24 is compressed, the spindle 22 drives the push rod 25 and the push circular table 26 to descend, the circular table 26 is pushed to drive the second double-layer reduction transmission gear 13 to descend, the second double-layer reduction transmission gear 13 compresses the return spring I20, the large-diameter gear 18 in the second double-layer reduction transmission gear 13 is not meshed with the small-diameter gear 19 in the third double-layer reduction transmission gear 14, so that the automatic, when the shaft sleeve 27 is not pressed, the function of automatically opening the actuator can be realized.

In more detail, the upper casing 3 and the lower casing 4 are clamped and matched through the connecting partition plate 5, the lower casing 4 is convexly provided with a plurality of clamping protrusions 36, the upper casing 3 is convexly provided with clamping blocks 37 with a corresponding number, the rear end face of each clamping block 37 is provided with a clamping groove 38 for the clamping protrusions 36 to be matched and clamped, the connecting partition plate 5 is provided with a clamping groove 39 for the clamping protrusions to extend into, the clamping blocks 37 and the clamping grooves 38 are clamped and matched, the clamping groove 39 is provided with a plurality of clamping blocks 40, the clamping grooves 36 are provided with grooves 41 corresponding to the clamping blocks 40, the clamping blocks 40 correspondingly enter the grooves 41 to realize clamping, the double-layer clamping function realizes a better connecting effect and is not easy to loosen, the end part, facing the upper casing 3, of the connecting partition plate 5 is provided with the fixing plate 29 for fixing the gear rotating shaft 10, the peripheral wall of the bottom of the motor 6 outwards symmetrically extends to form the connecting part 30, and the connecting part 30 is connected with the.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. A heating temperature balance adjustment actuator is characterized by comprising an actuator body (1), wherein a manual and automatic adjusting mechanism (2) is arranged on the actuator body (1), manual and automatic operation switching of the actuator body (1) is realized through the manual and automatic adjusting mechanism (2), the actuator body (1) consists of an upper shell (3) and a lower shell (4), the upper shell (3) and the lower shell (4) are connected through a connecting partition plate (5), a motor (6) with a temperature sensing function is arranged in the upper shell (3), a plurality of groups of double-layer reduction transmission gears which are driven by the motor (6) to mutually transmit are arranged in the lower shell (4), a control knob (7) capable of manually rotating is arranged outside the upper shell (3), a fixed rotating shaft (8) which is fixedly connected with the control knob (7) and driven by the control knob (7) to rotate is further arranged in the upper shell (3), this fixed rotating shaft (8) pass and connect baffle (5) and stretch into down casing (4) in, fixed rotating shaft (8) go up the cover and establish gear shaft (10) that have external gear (9), external gear (9) on this gear shaft (10) mesh with above-mentioned double-deck reduction gear mutually, the one end of gear shaft (10) is located casing (3) and the tip and the control knob (7) spline fit connection of this end, and the other end is located down casing (4) and the tip and fixed rotating shaft (8) of this end are connected through the cooperation of multilayer spline housing, connection baffle (5) on have the fixed through hole that supplies gear shaft (10) to pass through, double-deck reduction gear and connect baffle (5) between through the shell fragment that can play the buffering and fall the effect of making an uproar.

2. The heating temperature balance adjusting actuator according to claim 1, wherein the end surface of the connecting partition plate (5) facing the lower housing (4) is provided with two extending seats (11) which axially extend and protrude outwards, the two extending seats (11) are fixedly connected with a fixing shaft, and the fixing shaft penetrates through the extending seats (11) and extends into the corresponding double-layer reduction transmission gear to be connected with the double-layer reduction transmission gear in a matching manner.

3. The heating temperature balance adjusting actuator according to claim 2, wherein the two-layer reduction transmission gears are four groups, the four groups of two-layer reduction transmission gears are respectively a first two-layer reduction transmission gear (12), a second two-layer reduction transmission gear (13), a third two-layer reduction transmission gear (14) and a fourth two-layer reduction transmission gear (15), the two fixing shafts are respectively a first fixing shaft (16) and a second fixing shaft (17), the first two-layer reduction transmission gear (12) and the second two-layer reduction transmission gear (13) are alternately sleeved on the first fixing shaft (16), and the third two-layer reduction transmission gear (14) and the fourth two-layer reduction transmission gear (15) are alternately sleeved on the second fixing shaft (17).

4. The heating temperature balance adjustment actuator according to claim 3, wherein the first double reduction transmission gear (12), the second double reduction transmission gear (13), the third double reduction transmission gear (14) and the fourth double reduction transmission gear (15) are formed by integrally combining a large-diameter gear (18) and a small-diameter gear (19), the small-diameter gear (19) of the first double reduction transmission gear (12) is engaged with the large-diameter gear (18) of the third double reduction transmission gear (14), the small-diameter gear (19) of the third double reduction transmission gear (14) is engaged with the large-diameter gear (18) of the second double reduction transmission gear (13), and the small-diameter gear (19) of the second double reduction transmission gear (13) is engaged with the large-diameter gear (18) of the fourth double reduction transmission gear (15), the tail end part of the first fixed shaft (16) is further sleeved with a first return spring (20).

5. The heating temperature balance adjustment actuator according to claim 4, wherein the external gear (9) on the gear rotating shaft (10) is meshed with a small-diameter gear (19) in the fourth double reduction transmission gear (15).

6. The heating temperature balance adjustment actuator according to claim 3, wherein a movable space (21) is provided between the second double reduction transmission gear (13) and the fourth double reduction transmission gear (15).

7. The heating temperature balance adjustment actuator according to claim 3, wherein the manual/automatic adjustment mechanism (2) comprises a main shaft (22) extending from the inside of the upper housing (3) to the inside of the lower housing (4), a fixing rod (23) is convexly disposed at a position of the inner bottom wall of the lower housing (4) corresponding to the main shaft (22), an upper end of the fixing rod (23) extends into the main shaft (22), a second return spring (24) is sleeved on the fixing rod (23), one end of the second return spring (24) abuts against the bottom of the main shaft (22), the other end of the second return spring (24) abuts against the inner bottom wall of the lower housing (4), the main shaft (22) can vertically move along the outer wall of the fixing rod (23), and a push rod (25) is disposed on the outer peripheral wall of the main shaft (22) and between the first double-layer reduction transmission gear (12) and the second double-layer reduction transmission gear (13), the automatic manual adjusting mechanism comprises a push rod (25), a first double-layer reduction transmission gear (12), a second double-layer reduction transmission gear (13), a large-diameter gear (18) and a pressing shaft sleeve (27), wherein the push rod (25) extends to the position between the first double-layer reduction transmission gear (12) and the second double-layer reduction transmission gear (13) and is abutted to the surface of the large-diameter gear (18) in the second double-layer reduction transmission gear (13) through a pushing circular table (26), the automatic manual adjusting mechanism (2) further comprises a pressing shaft sleeve (27) which is arranged in the upper shell (3) in a position and wraps a main shaft (22) and is used for driving the main shaft (22) to vertically move along the outer wall of a fixing rod (23), a pressing.

8. The heating temperature balance adjustment actuator according to claim 1, wherein the upper housing (3) and the lower housing (4) are in snap fit through a connecting partition (5).

9. The heating temperature balance adjustment actuator according to claim 1, wherein the end of the connecting partition (5) facing the upper casing (3) is provided with a fixing plate (29) for fixing the gear rotating shaft (10), the peripheral wall of the bottom of the motor (6) is provided with a connecting portion (30) extending outwards symmetrically, and the connecting portion (30) is connected with the connecting partition (5) through a fixing bolt (31).

10. The heating temperature balance adjusting actuator according to claim 3, wherein the spring plate is composed of a spring plate body (32) and bent plates (33) integrally connected to two ends of the spring plate body (32), the two bent plates (33) are arranged in a bending mode and are respectively abutted against the end faces of the large-diameter gears (18) in the first double-layer reduction transmission gear (12) and the third double-layer reduction transmission gear (14), the spring plate body (32) is connected with the connecting partition plate (5) through a connecting bolt (34), and a plurality of limiting convex blocks (35) used for limiting the spring plate body (32) are arranged at the end portion of the connecting partition plate (5).