CN214740700U

CN214740700U - Manual-automatic integrated driving device of intelligent casement door and window

Info

Publication number: CN214740700U
Application number: CN202120225319.XU
Authority: CN
Inventors: 胡静俊
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-01-28
Filing date: 2021-01-28
Publication date: 2021-11-16
Anticipated expiration: 2031-01-28

Abstract

The utility model discloses a manual-automatic integrated driving device of an intelligent casement door and window, which comprises a shell, a driving motor, a transmission gear set, a planetary clutch gear set, a transmission rod connecting seat, a transmission rod sliding block and a sliding block fixing seat; a driving motor, a transmission gear set and a planetary clutch gear set are arranged in the shell; the planetary clutch gear set is connected with three planetary gears through a duplicate gear sun gear to drive the movable gear to run; the driving motor is connected with a driving transmission rod of the transmission gear set; the transmission rod is fixed on the square block of the sixth big gear through the transmission rod connecting seat; a transmission rod sliding block and a sliding block fixing seat are hinged to the transmission rod; when the transmission gear set is in a transmission state, the second duplex pinion of the transmission gear set drives the three planet gears through the connecting duplex gear sun gear to drive the movable gear and the large gear in the third duplex gear to synchronously rotate; when the transmission is stopped, the movable gear of the planetary clutch gear set is connected with the third, fourth, fifth, sixth duplicate gear of the transmission gear set to rotate to form idle rotation, so that automatic and manual switching is realized, and the operation is simple and convenient.

Description

Manual-automatic integrated driving device of intelligent casement door and window

Technical Field

The utility model relates to an intelligent door and window field specifically is an intelligence flat-open door and window's manual-automatic drive arrangement.

Background

With the development of science and technology, people continuously pursue the living quality and the living taste, and the application of the intelligent household casement door and window in automation is more and more extensive; providing great convenience for the daily life of people.

Because the intelligent casement window drives the door and window by adopting electric power, the opening and closing of the door and window cannot be controlled once the power failure condition occurs; therefore, a manual-automatic integrated driving device of the intelligent side-hung door window is provided for solving the problems.

Disclosure of Invention

In order to compensate prior art's not enough, because intelligence flat-open window adopts electric power to drive door and window, in case the condition that has a power failure appears, the problem of just can't controlling door and window's opening and shutting, the utility model provides an intelligence flat-open door and window's manual-automatic drive arrangement.

A manual-automatic integrated driving device of an intelligent side-hung door and window comprises a shell and a driving motor; a driving motor, a transmission gear set and a planetary clutch gear set are arranged in the shell; the planetary clutch gear set is connected with three planetary gears through a duplicate gear sun gear to be meshed with the movable gear to rotate; the driving motor drives the transmission rod through the transmission gear set; the transmission rod is fixed on the square block of the sixth big gear through the transmission rod connecting seat and a fourth screw hole; a transmission rod sliding block is hinged on the opening transmission rod; the transmission rod sliding block is buckled and spliced with a sliding block fixing seat.

Preferably, the planetary clutch gear set consists of a duplicate gear sun gear, 3 movable planetary gears, 3 cylindrical pins, 3 springs, 6 buckles, a bracket and a movable gear; the 3 movable planet gears are installed in the movable gears through the cylindrical pins; a spring and a buckle are sleeved on the cylindrical pin, and the movable planetary gear is limited by the bracket; the dual gear sun gear is meshed with the three movable planet gears; the three movable planet gears are meshed with the inner teeth of the movable gears;

the external teeth of the movable gear are meshed with the third duplex bull gear;

preferably, when in a transmission state, the second duplex pinion drives the three planet gears through the duplex gear sun gear to drive the movable gear to rotate synchronously with the third duplex bull gear;

preferably, when the transmission is stopped, the loose gear of the planetary clutch gear set is connected with the third, fourth, fifth and sixth gears of the transmission gear set (41) to rotate to form idle rotation.

Preferably, the transmission gear set consists of a first gearwheel, a first pinion, a second gearwheel, a second pinion, a third gearwheel, a third pinion, a fourth gearwheel, a fourth pinion, a fifth gearwheel, a fifth pinion and a sixth gearwheel; a first pinion is fixedly connected to the first gearwheel in a concentric manner; a second bull gear is connected to the first pinion in a meshing manner; a second pinion is fixedly connected to the second gearwheel in a concentric manner; a planetary clutch gear set is connected to the second pinion in a meshing manner; the planetary clutch gear set is meshed with a third gearwheel through a movable gear; a third pinion is concentrically and fixedly connected to the third gearwheel; a fourth bull gear is connected to the third pinion in a meshing manner; a fourth pinion is concentrically and fixedly connected to the fourth bull gear; a fifth bull gear is connected to the fourth pinion in a meshed manner; a fifth pinion is concentrically and fixedly connected to the fifth bull gear; and a sixth large gear is connected to the fifth small gear in a meshing manner.

Preferably, one end of the transmission rod is connected in a first screw hole on the transmission rod connecting seat and the square block in a buckling mode through a screw and the first fixing hole position; the other end of the transmission rod is hinged to the transmission rod sliding block through a fifth screw hole aligned with the second fixing hole; the transmission rod sliding block is in threaded connection with an adjusting screw and is in sliding connection with an adjusting trapezoidal block; an elastic sheet corresponding to the metal head is arranged in the groove of the sliding block fixing seat; the metal head is fixedly connected to the transmission rod sliding block; a sixth screw hole is formed in the sliding block fixing seat; and a fifth screw hole is formed in the transmission rod sliding block.

Preferably, the front end of the driving motor is provided with a copper gear; the copper gear is connected with a first large gear in a meshing manner; the copper gear is of a worm type; the rear end of the driving motor is provided with a positive and negative electrode wiring point; and the electric wire of the driving motor is communicated with the outside through the semicircular hole.

Preferably, the shell is formed by buckling a lower cover and an upper cover and is fixed through a second screw hole; the driving motor, the transmission gear set and the planetary clutch gear set are rotationally connected in the lower cover through a second cylindrical pin; two sides of the sixth big gear are fixedly connected with first bearings; a circular step is fixedly connected to the upper cover corresponding to the sixth big gear; a transmission rod fixing seat is rotatably connected in the circular step through a second bearing, and third screw holes are formed in four sides of the upper cover.

The utility model discloses an useful part lies in:

1. the utility model is composed of a dual gear sun gear, three planet gears, 3 first cylindrical pins, 3 springs, 6 buckles, a bracket and a movable gear which are meshed and rotated through a planet clutch gear set; three movable planet gears are meshed and connected to the duplicate gear sun gear; the double-gear sun gear is meshed and connected to the inner teeth of the movable gear through three movable planet gears; the three planetary gears are connected in three cylindrical pin holes of the movable gear for limiting through three first cylindrical pins which are sleeved with springs and buckles and a bracket; the outer teeth of the movable gear are connected with a third large gear; when the driving motor is controlled to rotate forwards and backwards electrically, the second pinion is meshed with the sun gear of the duplicate gear to rotate, then three planetary gears meshed with the sun gear of the duplicate gear are driven, then external teeth of the three planetary gears meshed with the movable gear are connected with the third gearwheel to rotate, and then the driving rod rotates forwards and backwards; if manual operation is needed, three planet gears in the movable gear of the planet clutch gear set rotate around the sun gear of the double gear, so that the movable gear idles, the manual switch can be realized by rotating the opening and closing transmission rod by hand, and the conversion between electric operation and manual operation is realized in the application embodiment. The whole structure of the planetary clutch gear set has good stability and positioning performance, can be stably installed during separation, and can also keep the rotation stability during operation; the operation is simpler and the use is more convenient.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive exercise.

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the inner structure of the lower cover of the housing of the present invention;

FIG. 3 is a schematic view of the structure of the upper cover of the housing of the present invention;

fig. 4 is a schematic structural view of the planetary clutch gear of the present invention;

FIG. 4-1 is a perspective view of the planetary clutch gear of the present invention;

fig. 5 is a schematic view of the structure of the transmission rod of the present invention;

fig. 6 is a schematic view of the structure of the transmission rod sliding block and the fixing seat of the present invention;

fig. 7 is a schematic view of the structure of the transmission rod fixing seat of the present invention.

In the figure: a housing 1; a lower cover 111; an upper cover 112; a drive motor 2; a copper gear 3; a first gearwheel 4; a first pinion gear 5; a second bull gear 6; a second pinion gear 7; a planetary clutch gear set 8; a dual gear sun gear 81; a movable gear 9; a planetary gear 10; a first cylindrical pin 101; a spring 102; a buckle 103; a cylindrical pin hole 104; a bracket 105; a third gearwheel 11; a third pinion gear 12; a fourth bull gear 13; a fourth pinion gear 14; a fifth bull gear 15; a fifth pinion gear 16; a sixth large gear 17; a square block 18; a first screw hole 19; a first bearing 20; a second screw hole 21; a semicircular hole 22; positive and negative electrodes 23; a circular step 24; a third screw hole 25; a second bearing 26; a second cylindrical pin 27; a transmission rod 28; second fixing hole locations 29; a first fixing hole site 30; a transmission rod connecting seat 31; a fourth screw hole 32; a transmission rod slider 33; a fifth screw hole 34; a slider fixing base 35; an adjusting screw 36; adjusting the trapezoidal blocks 37; a metal head 38; a spring plate 39; a sixth screw hole 40; a drive gear set 41.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Referring to fig. 1-4, a manual-automatic integrated driving device for an intelligent casement door and window includes a housing 1, a driving motor 2, a transmission gear set 41, a planetary clutch gear set 8, a transmission rod 28, a transmission rod connecting seat 31, a transmission rod sliding block 33, and a sliding block fixing seat 35; a driving gear set 41 and a planetary clutch gear set 8 of the driving motor 2 are arranged in the shell 1; the planet clutch gear 8 is connected with three planet gears 10 through a duplicate gear sun gear 81 to be meshed with the movable gear 9 to rotate; the driving motor 2 drives the transmission rod 28 through the transmission gear set 41; the transmission rod 28 is fixed on the square block 18 of the sixth big gear 17 through a transmission rod connecting seat 31 and a fourth screw hole 32; the sixth large gear 17 is rotatably connected in the shell 1; a transmission rod sliding block 33 is hinged on the opening and closing transmission rod 28; the transmission rod sliding block 33 is buckled and inserted with a transmission rod fixing seat 35.

As an embodiment of the present invention, the planetary clutch gear set 8 is composed of a dual gear sun gear 81, three planetary gears 10, three first cylindrical pins 101, three springs 102, six buckles 103, a bracket 105 and a movable gear 9; the dual-gear sun gear 81 is rotatably connected to the second cylindrical pin 27; three movable planetary gears 10 are meshed and connected to the duplicate gear sun gear 81; the dual-gear sun gear 81 is rotationally connected to the internal teeth of the movable gear 9 by meshing three planet gears 10; the movable gear 9 is rotationally connected to the second cylindrical pin 27; the planet gear 10 is connected in a cylindrical pin hole 104 on the movable gear 9 through a first cylindrical pin 101, a spring 102, a buckle 103 and a bracket 105 and is used for limiting the planet gear 10; the cylindrical pin hole 104 is formed in the movable gear 9; a third gearwheel 11 is connected to the external teeth of the movable gearwheel 9 in a meshing manner; if the electric driving is needed, when the driving motor 2 is controlled to rotate forwards and backwards through the electric control, the second duplex pinion 7 is meshed with the duplex gear sun gear 81 to rotate, then three planet gears 10 meshed with the duplex gear sun gear 81 are driven, then the external teeth of the three planet gears 10 meshed with the movable gear 9 are connected with the third large gear 11 to rotate, and then the transmission rod 28 rotates forwards and backwards; if manual operation is required, the three planetary gears 10 in the loose gear 9 of the planetary clutch gear set 8 rotate around the double gear sun gear 81, so that the loose gear 9 idles, and the manual switch is realized by rotating the transmission rod 28 by hand, and the conversion between electric operation and manual operation is realized in the present embodiment. The planet clutch gear set 8 has good stability and positioning performance in the whole structure, can be stably installed during separation, can also keep the rotation stability during operation, and is simpler to operate and more convenient to use.

As an embodiment of the present invention, the transmission gear set 41 is composed of a first gearwheel 4, a first pinion 5, a second gearwheel 6, a second pinion 7, a third gearwheel 11, a third pinion 12, a fourth gearwheel 13, a fourth pinion 14, a fifth gearwheel 15, a fifth pinion 16, and a sixth gearwheel 17; a first small gear 5 is concentrically and fixedly connected to the first big gear 4; a second bull gear 6 is connected to the first pinion 5 in a meshing manner; a second small gear 7 is concentrically and fixedly connected to the second large gear 6; a planetary clutch gear set 8 is connected to the second pinion 7 in a meshing manner; the planetary clutch gear set 8 is meshed with a third gearwheel 11 through a movable gear 9; a third pinion 12 is concentrically and fixedly connected to the third gearwheel 11; a fourth bull gear 13 is connected to the third pinion gear 12 in a meshing manner; a fourth pinion 14 is concentrically and fixedly connected to the fourth bull gear 13; a fifth gearwheel 15 is connected to the fourth pinion 14 in a meshing manner; a fifth pinion 16 is concentrically and fixedly connected to the fifth gearwheel 15; a sixth large gear 17 is connected to the fifth small gear 16 in a meshing manner; when the door opening and closing device works, the door opening and closing device is formed by stepwise meshing and transmitting a first large gear 4, a first small gear 5, a second large gear 6, a second small gear 7, a third large gear 11, a third small gear 12, a fourth large gear 13, a fourth small gear 14, a fifth large gear 15, a fifth small gear 16 and a sixth large gear 17, so that the output rotating speed of the driving motor 2 is reduced, the output torque of the driving motor 2 is increased, and the door opening and closing function by generating large torque is realized;

as an embodiment of the present invention, one end of the opening/closing transmission rod 28 is connected to the transmission rod connection seat 31 and the first screw hole 19 on the square block 18 through the screw and the first fixing hole 30; the other end of the opening and closing transmission rod 28 is hinged on a transmission rod sliding block 33 through a fifth screw hole 34 aligned with a second fixing hole position 29; the transmission rod sliding block 33 is in threaded connection with an adjusting screw 36 and is in sliding connection with an adjusting trapezoidal block 37; an elastic sheet 39 corresponding to the metal head 38 is arranged in the groove of the sliding block fixing seat 35; the metal head 38 is fixedly connected to the transmission rod sliding block 33; a sixth screw hole 40 is formed in the slider fixing seat 35; the transmission rod sliding block 33 is provided with a fifth screw hole 34, when the transmission rod sliding block works, the transmission rod sliding block 33 and the sliding block fixing seat 35 can be stably and detachably buckled and connected through the elastic sheet 39, and meanwhile, the adjusting screw 36 and the adjusting trapezoidal block 37 can be adjusted, fixedly connected and matched to adapt to different door and window gaps;

as an embodiment of the present invention, a copper gear 3 is installed at the front end of the driving motor 2; the copper gear 3 is connected with a first large gear 4 in a meshing manner; the copper gear 3 is of a worm type; the rear end of the driving motor 2 is provided with a positive and negative electrode wiring point 23; the electric wire of the driving motor 2 is communicated with the outside through the semicircular hole 22; when the transmission device works, the rotation of the horizontal square can be converted into the rotation in the vertical horizontal direction through the copper gear 3, so that the function of small-space transmission is realized;

as an embodiment of the present invention, the housing 1 is formed by fastening a lower cover 111 and an upper cover 112 and is fixed by a second screw hole 21; the driving motor 2, the transmission gear set 41 and the planetary clutch gear 8 are rotationally connected in the lower cover 111 through a second cylindrical pin 27; two sides of the sixth big gear 17 are fixedly connected with a first bearing 20; a circular step 24 is fixedly connected to the upper cover 112 corresponding to the sixth big gear 17; a transmission rod fixing seat 35 is rotatably connected in the circular step 24 through a second bearing 26, and third screw holes 25 are formed in four sides of the upper cover 112; during operation, the bearing 20 can effectively reduce the rotating resistance of the sixth big gear 17, reduce abrasion and prolong the service life.

According to the working principle, when the driving motor 2 is controlled to rotate forwards and backwards electrically, the second duplex pinion 7 is meshed with the duplex gear sun gear 81 to rotate, then three planet gears 10 meshed with the duplex gear sun gear 81 are driven, then external teeth of the three planet gears 10 meshed with the movable gear 9 are connected with the third large gear 11 to rotate, and then the transmission rod 28 rotates forwards and backwards; if the electric driving is needed, when the driving motor 2 is controlled to rotate forwards and backwards through the electric control, the second duplex pinion 7 is meshed with the duplex gear sun gear 81 to rotate, then three planet gears 10 meshed with the duplex gear sun gear 81 are driven, then the external teeth of the three planet gears 10 meshed with the movable gear 9 are connected with the third large gear 11 to rotate, and then the transmission rod 28 rotates forwards and backwards; if manual operation is required, the three planetary gears 10 in the loose gear 9 of the planetary clutch gear set 8 rotate around the double gear sun gear 81, so that the loose gear 9 idles, and the manual switch is realized by rotating the transmission rod 28 by hand, and the conversion between electric operation and manual operation is realized in the present embodiment. The planetary clutch gear set 8 has good stability and positioning performance in the whole structure, can be stably installed during separation, can keep rotation stability during operation, is simpler to operate and more convenient to use, and is formed by stepwise meshing and transmitting a first large gear 4, a first small gear 5, a second large gear 6, a second small gear 7, a third large gear 11, a third small gear 12, a fourth large gear 13, a fourth small gear 14, a fifth large gear 15, a fifth small gear 16 and a sixth large gear 17, so that the output rotating speed of the driving motor 2 is reduced, the output torque of the driving motor 2 is increased, and the function of generating large torque to open and close the door is realized; the transmission rod sliding block 33 and the transmission rod fixing seat 35 can be stably and detachably buckled and connected through the elastic sheet 39, and meanwhile, the adjustable fixedly-connected matching of the adjusting screw 36 and the adjusting trapezoidal block 37 can adapt to different door and window gaps; the copper gear 3 can convert the horizontal square rotation into the rotation in the vertical horizontal direction, thereby realizing the function of small-space transmission; the bearing 20 can effectively reduce the rotating resistance of the sixth big gear 17, reduce the abrasion and prolong the service life.

In the description herein, references to the description of "one embodiment," "an example," "a specific example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention.

Claims

1. The utility model provides an intelligence flat-open door and window's manual-automatic drive arrangement which characterized in that: the transmission mechanism comprises a shell (1), a driving motor (2), a transmission gear set (41), a planetary clutch gear set (8), a transmission rod (28), a transmission rod connecting seat (31), a transmission rod sliding block (33) and a sliding block fixing seat (35);

a driving motor (2), a transmission gear set (41) and a planetary clutch gear set (8) are arranged in the shell (1);

the planetary clutch gear set (8) is connected with three planetary gears (10) through a duplicate gear sun gear (81) to be meshed with the movable gear (9) to rotate;

the driving motor (2) drives the transmission rod (28) by being connected with the transmission gear set (41) and the planetary clutch gear set (8);

the transmission rod (28) is fixed on the square block (18) of the sixth big gear (17) through a transmission rod connecting seat (31) and a fourth screw hole (32);

a transmission rod sliding block (33) is hinged on the opening and closing transmission rod (28); the transmission rod sliding block (33) is buckled and spliced with a sliding block fixing seat (35).

2. The manual-automatic integrated driving device for the intelligent side-hung doors and windows according to claim 1, characterized in that: the planetary clutch gear set (8) comprises a duplicate gear sun gear (81), 3 movable planetary gears (10), 3 cylindrical pins (101), 3 springs (102), 6 buckles (103), a bracket (105) and a movable gear (9);

the 3 movable planet gears (10) are arranged in the movable gear (9) through the cylindrical pin (101);

a spring (102), a buckle (103) and a bracket (105) are sleeved on the cylindrical pin (101) to limit the movable planetary gear (9);

the duplicate gear sun gear (81) is meshed with the three movable planet gears (10);

the three movable planetary gears (10) are meshed with the inner teeth of the movable gear (9);

the outer teeth of the movable gear (9) are meshed with the third duplex big gear (11);

when the transmission mechanism is in a transmission state, the second duplex pinion (7) drives the three planet gears (10) through the duplex gear sun gear (81) to drive the movable gear (9) and the third duplex bull gear (11) to synchronously rotate;

when the transmission is stopped, the loose gear of the planetary clutch gear set (8) is connected with the third, fourth, fifth and sixth gears of the transmission gear set (41) to rotate to form idle rotation.

3. The manual-automatic integrated driving device for the intelligent side-hung doors and windows according to claim 1, characterized in that: the transmission gear set (41) consists of a first large gear (4), a first small gear (5), a second large gear (6), a second small gear (7), a third large gear (11), a third small gear (12), a fourth large gear (13), a fourth small gear (14), a fifth large gear (15), a fifth small gear (16) and a sixth large gear (17); a first small gear (5) is concentrically and fixedly connected to the first big gear (4); a second bull gear (6) is connected to the first pinion (5) in a meshing manner; a second small gear (7) is concentrically and fixedly connected to the second big gear (6); a planetary clutch gear set (8) is connected to the second pinion (7) in a meshed manner; the planetary clutch gear set (8) is meshed with a third gearwheel (11) through a movable gear (9); a third pinion (12) is concentrically and fixedly connected to the third gearwheel (11); a fourth bull gear (13) is connected to the third pinion (12) in a meshing manner; a fourth pinion (14) is concentrically and fixedly connected to the fourth bull gear (13); a fifth bull gear (15) is connected to the fourth pinion (14) in a meshing manner; a fifth pinion (16) is concentrically and fixedly connected to the fifth gearwheel (15); and a sixth large gear (17) is connected to the fifth small gear (16) in a meshing manner.

4. The manual-automatic integrated driving device for the intelligent side-hung doors and windows according to claim 1, characterized in that: one end of the transmission rod (28) is buckled and connected in a transmission rod connecting seat (31) and a first screw hole (19) on the square block (18) through a screw and a first fixing hole position (30); the other end of the transmission rod (28) is hinged on a transmission rod sliding block (33) through a fifth screw hole (34) aligned with a second fixing hole position (29); the transmission rod sliding block (33) is in threaded connection with an adjusting screw (36) and is in sliding connection with an adjusting trapezoidal block (37); an elastic sheet (39) corresponding to the metal head (38) is arranged in the groove of the sliding block fixing seat (35); the elastic sheet (39) is fixedly connected to the sliding block fixing seat (35); a sixth screw hole (40) is formed in the sliding block fixing seat (35); and a fifth screw hole (34) is formed in the transmission rod sliding block (33).

5. The manual-automatic integrated driving device for the intelligent side-hung doors and windows according to claim 4, characterized in that: the front end of the driving motor (2) is provided with a copper gear (3); the copper gear (3) is connected with a first large gear (4) in a meshing manner; the copper gear (3) is of a worm type; the rear end of the driving motor (2) is provided with a positive and negative electrode wiring point (23); and the electric wire of the driving motor (2) is communicated with the outside through the semicircular hole (22).

6. The manual-automatic integrated driving device for the intelligent side-hung doors and windows according to claim 5, is characterized in that: the shell (1) is formed by buckling a lower cover (111) and an upper cover (112) and is fixed through a second screw hole (21); the driving motor (2), the transmission gear set (41) and the planetary clutch gear (8) are rotationally connected in the lower cover (111) through a second cylindrical pin (27); two sides of the sixth big gear (17) are fixedly connected with a first bearing (20); a circular step (24) is fixedly connected to the upper cover (112) corresponding to the sixth big gear (17); the round step (24) is internally and rotatably connected with a transmission rod fixing seat (35) through a second bearing (26), and the four sides of the upper cover (112) are provided with third screw holes (25).