CN113800456B

CN113800456B - Full-automatic filling equipment

Info

Publication number: CN113800456B
Application number: CN202111259628.XA
Authority: CN
Inventors: 季国苗; 吴光忠; 俞永牛; 郑国江
Original assignee: Shaoxing Zhiwei Food Co ltd
Current assignee: Shaoxing Zhiwei Food Co ltd
Priority date: 2021-10-28
Filing date: 2021-10-28
Publication date: 2022-12-13
Anticipated expiration: 2041-10-28
Also published as: CN113800456A

Abstract

A full-automatic filling device belongs to the technical field of filling devices; through setting up the upset and adding holding mechanism, utilize two sets of centre gripping groups among the upset fixture to carry out the centre gripping to the filling bottle, conveniently overturn to the filling bottle, through setting up first turn-over mechanism and second turn-over mechanism, utilize two hypotenuses of triangle-shaped plate and two hypotenuses in V type groove to form two guide ways in the first turn-over mechanism, overturn fixture, it is rotatory to drive the filling bottle, pour the liquid in the filling bottle, utilize two hypotenuses of triangle-shaped plate and two hypotenuses in V type groove to form two guide ways in the second turn-over mechanism, overturn the filling bottle once more, resume the filling bottle to home position, make things convenient for canning material mechanism to carry out the filling, through setting up canning material mechanism, it follows the rotatory synchronous motion of annular mounting bracket to drive canning material mechanism through second driving motor in the canning material mechanism, the convenience is filled the filling bottle.

Description

Full-automatic filling equipment

Technical Field

The invention belongs to the technical field of filling equipment, and particularly relates to full-automatic filling equipment.

Background

The canning machine belongs to one of the packaging equipment, and is widely applied to the tank body packaging production process of products such as liquid, powder, particles and the like. The packaging machine can be divided into a liquid packaging machine, a paste packaging machine, a liquid packaging machine, a particle packaging machine and the like; from the degree of automation of production, filling machines can be divided into semi-automatic filling machines and fully-automatic filling machines.

The liquid filling machine is mainly applied to the production of various liquid products, for example, in the production process of fruit juice beverages, the liquid filling machine is required to be used for filling bottles of the fruit juice beverages, so that canned fruit juice beverage finished products are prepared. The action of overturning and dumping the bottle body is not carried out before filling in the existing liquid filling machine, residual liquid possibly exists in the bottle body after cleaning, and the problem of the quality of the filled soy sauce is caused.

Disclosure of Invention

The invention mainly solves the technical problems in the prior art and provides full-automatic filling equipment.

The technical problem of the invention is mainly solved by the following technical scheme: a full-automatic filling device comprises a mounting base plate, wherein a support column is arranged in the middle of the upper surface of the mounting base plate, a mounting seat is arranged at the upper end of the support column, a plurality of first support frames are arranged on the upper surface of the mounting seat along an axis ring array of the mounting seat, an annular slide rail is arranged on the outer ring surface of the mounting seat, the annular slide rail and the mounting seat are coaxially arranged and fixedly connected, a rotary seat is arranged on the annular slide rail and rotatably connected to the annular slide rail, an annular gear ring is arranged on the outer ring surface of the rotary seat, two first driving motors are arranged on the mounting base plate, a first gear is fixedly connected to the driving shafts of the two first driving motors, and the two first gears are meshed with the annular gear ring, the utility model discloses a rotary table, including the roating seat, annular ring gear, a plurality of second support frames, a plurality of rotary table, the upper surface ring of roating seat sets up and both fixed connection, the axis ring array of roating seat has a plurality of second support frames along the upper surface ring of roating seat, the top of roating seat is equipped with an annular mounting bracket, and is a plurality of the equal fixed connection in the lower terminal surface of annular mounting bracket in the upper end of second support frame, the annular mounting bracket sets up with the roating seat coaxial line, there is multiunit upset fixture along the axis ring array of annular mounting bracket on the annular mounting bracket, upset fixture includes a rotation axis, the rotation axis is connected on the annular mounting bracket, the outer end of rotation axis is equipped with an outer end fixed connection, be equipped with two sets of centre gripping groups on the outer lane of outer roll-over board, the distance between adjacent two sets of centre gripping group is all unanimous. Each group of clamping group comprises an installation base, a guide cylinder is arranged in the middle of the outer end face of the installation base, a sliding cylinder is arranged in the guide cylinder, a double-faced rack is arranged at the outer end of the sliding cylinder, and a pushing frame is arranged at the outer end of the double-faced rack.

Preferably, two clamping supports are symmetrically arranged on the mounting bases on two sides of the guide cylinder, a rotating frame is arranged at each of the outer ends of the two clamping supports, the middle position of the rotating frame is rotatably connected with the outer end of the clamping support, a tooth-shaped structure is arranged at the middle position of the inner side of each of the two rotating frames, and the tooth-shaped structures in the two rotating frames are meshed with the double-sided rack.

Preferably, the inner end of the rotating shaft is provided with an inner overturning plate, the inner overturning plate is fixedly connected with the rotating shaft, the inner overturning plate is horizontally arranged, two ends of the inner side surface of the inner overturning plate are respectively provided with a roller, and the two rollers are rotatably connected with the inner overturning plate.

Preferably, the top of mount pad is equipped with a spacing ring, the spacing ring sets up with the mount pad coaxial line, and is a plurality of the equal fixed connection in the lower terminal surface of spacing ring in the upper end of first support frame, two the gyro wheel is all rotated and is connected on the lower terminal surface of spacing ring, be equipped with first turn-over mechanism and second turn-over mechanism on the spacing ring, the front end of spacing ring is located to first turn-over mechanism, the left side of first turn-over mechanism is located to second turn-over mechanism, and the distance of mechanism is added in two sets of upsets of interval between first turn-over mechanism and the second turn-over mechanism.

As preferred, first turn-over mechanism includes that one sets up the V type groove on the spacing ring, be equipped with a connecting rod on the spacing ring inner circle that V type groove corresponds, the lower extreme of connecting rod is equipped with a triangle-shaped board, the triangle-shaped board is isosceles triangle shape, the hypotenuse of homonymy is parallel to each other in two hypotenuses of triangle-shaped board and the V type groove, and two hypotenuses of triangle-shaped board and V type groove form two guide ways, the horizontal edge of triangle-shaped board lower extreme is less than the lower extreme of spacing ring.

As preferred, be equipped with a set of jar material mechanism on the mounting plate of support column right side rear side, jar material mechanism includes that two locate the support on the mounting plate, and the upper end of two supports is connected with an arc slide rail, the centre of a circle of arc slide rail and the coincidence of the centre of a circle of support column, be equipped with a sliding seat on the arc slide rail, be equipped with an arc rack on the outer terminal surface of arc slide rail, arc rack and the outer lane face laminating fixed connection of arc slide rail, the last sliding connection of arc slide rail has two sets of slip groups, and is two sets of interval between the slip group is unanimous with the interval between the adjacent two sets of upset fixture.

Preferably, the sliding group comprises a vertical frame arranged on the upper surface of the sliding seat, a transverse frame plate is arranged at the upper end of the vertical frame, a guide rod is arranged in the middle of the upper surface of the transverse frame plate, a sliding plate is connected onto the guide rod in a sliding manner, a material pipe is fixedly connected to the right end of the sliding plate, the lower end of the material pipe is connected to the right end of the transverse frame plate in a sliding manner, a material inlet pipe is connected to the upper end of the material pipe, a telescopic cylinder is arranged at the right end of the transverse frame plate, and the extending end of the telescopic cylinder is fixedly connected to the right end of the sliding plate.

Preferably, a second driving motor is arranged in the middle of the upper surface of the arc-shaped sliding rail, a second gear is fixedly connected to a driving shaft of the second driving motor, and the second gear is meshed with the arc-shaped rack.

The invention has the following beneficial effects: through setting up the upset and adding holding mechanism, utilize two sets of centre gripping groups among the upset fixture to carry out the centre gripping to the filling bottle, conveniently overturn to the filling bottle, through setting up first turn-over mechanism and second turn-over mechanism, utilize two hypotenuses of triangle-shaped plate and two hypotenuses in V type groove to form two guide ways in the first turn-over mechanism, overturn fixture, it is rotatory to drive the filling bottle, pour the liquid in the filling bottle, utilize two hypotenuses of triangle-shaped plate and two hypotenuses in V type groove to form two guide ways in the second turn-over mechanism, overturn the filling bottle once more, resume the filling bottle to home position, make things convenient for canning material mechanism to carry out the filling, through setting up canning material mechanism, it follows the rotatory synchronous motion of annular mounting bracket to drive canning material mechanism through second driving motor in the canning material mechanism, the convenience is filled the filling bottle.

Drawings

FIG. 1 is a schematic perspective view of the present invention;

FIG. 2 is a schematic diagram of a front view of the present invention;

fig. 3 is an enlarged schematic view of a portion a in fig. 1.

In the figure: 1. mounting a bottom plate; 2. a support pillar; 3. a mounting seat; 4. a first support frame; 5. an annular slide rail; 6. a rotating base; 7. an annular ring gear; 8. a first drive motor; 9. a first gear; 10. a second support frame; 11. an annular mounting frame; 12. a rotating shaft; 13. an outer roll-over plate; 14. installing a base; 15. a guide cylinder; 16. a second gear; 17. a slide cylinder; 18. a double-sided rack; 19. pushing the frame; 20. clamping the bracket; 21. a rotating frame; 22. a tooth-shaped structure; 23. an inner roll-over plate; 24. a roller; 25. a limiting ring; 26. a V-shaped groove; 27. a connecting rod; 28. a triangular plate; 29. a guide groove; 30. a support; 31. an arc-shaped slide rail; 32. a sliding seat; 33. an arc-shaped rack; 34. erecting a frame; 35. a transverse frame plate; 36. a guide bar; 37. a sliding plate; 38. a material pipe; 39. a feed pipe; 40. a telescopic cylinder; 41. a second drive motor.

Detailed Description

The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.

Example (b): the utility model provides a full-automatic filling equipment, as shown in fig. 1-fig. 3, includes mounting plate 1, the intermediate position of 1 upper surface of mounting plate is equipped with a support column 2, the upper end of support column 2 is equipped with a mount pad 3, the upper surface of mount pad 3 has a plurality of first support frames 4 along the axis ring array of mount pad 3, be equipped with an annular slide rail 5 on the outer lane face of mount pad 3, annular slide rail 5 with 3 coaxial line settings of mount pad and both fixed connection, be equipped with a roating seat 6 on the annular slide rail 5, 6 rotations of roating seat are connected on annular slide rail 5, be equipped with an annular ring 7 on the outer lane face of roating seat 6, be equipped with two first driving motor 8, two on the mounting plate 1 equal fixedly connected with a first gear 9, two on the drive shaft of first driving motor 8 first gear 9 all is connected with the meshing of annular ring 7, annular ring mounting bracket 7 sets up and both fixed connection with annular ring 6 with the coaxial line of roating seat, the upper surface ring of roating seat 6 has a plurality of second support frame 10 along the axis ring array of roating seat 6, the axis ring mounting bracket 11 upper end is equipped with 11 coaxial line settings of annular support frame 11, and 11 coaxial line settings of annular support frame 11, the lower extreme is connected on the annular support frame 11 coaxial line of annular support frame 11.

The overturning clamping mechanism comprises a rotating shaft 12, the rotating shaft 12 is rotatably connected to the annular mounting frame 11, an outer overturning plate 13 is arranged at the outer end of the rotating shaft 12, the outer overturning plate 13 is horizontally arranged, the outer overturning plate 13 is fixedly connected with the outer end of the rotating shaft 12, two groups of clamping groups are arranged on the outer ring surface of the outer overturning plate 13, and the distances between every two adjacent groups of clamping groups are identical. Each group of clamping groups comprises an installation base 14, a guide cylinder 15 is arranged in the middle of the outer end face of the installation base 14, a sliding cylinder 17 is arranged in the guide cylinder 15, a double-faced rack 18 is arranged at the outer end of the sliding cylinder 17, and a pushing frame 19 is arranged at the outer end of the double-faced rack 18.

Two clamping supports 20 are symmetrically arranged on the mounting base 14 on two sides of the guide cylinder 15, the outer ends of the two clamping supports 20 are respectively provided with a rotating frame 21, the middle position of each rotating frame 21 is rotatably connected with the outer end of each clamping support, the middle position of the inner side of each rotating frame 21 is provided with a tooth-shaped structure 22, and the tooth-shaped structures 22 in the two rotating frames 21 are meshed with the double-sided rack 18.

An inner overturning plate 23 is arranged at the inner end of the rotating shaft 12, the inner overturning plate 23 is fixedly connected with the rotating shaft 12, the inner overturning plate 23 is horizontally arranged, two rollers 24 are respectively arranged at two ends of the inner side surface of the inner overturning plate 23, and the two rollers 24 are rotatably connected with the inner overturning plate 23.

The top of mount pad 3 is equipped with a spacing ring 25, spacing ring 25 sets up with 3 coaxial lines of mount pad, and is a plurality of the equal fixed connection in the lower terminal surface of spacing ring 25 in the upper end of first support frame 4, two gyro wheel 24 all rotates to be connected on the lower terminal surface of spacing ring 25, be equipped with first turn-over mechanism and second turn-over mechanism on the spacing ring 25, the front end of spacing ring 25 is located to first turn-over mechanism, the left side of first turn-over mechanism is located to second turn-over mechanism, and the distance of mechanism is added in two sets of upsets in interval between first turn-over mechanism and the second turn-over mechanism.

First turn-over mechanism includes that one sets up the V type groove 26 on the spacing ring 25, be equipped with a connecting rod 27 on the spacing ring 25 inner circular surface that V type groove 26 corresponds, the lower extreme of connecting rod 27 is equipped with a triangle-shaped board 28, triangle-shaped board 28 is isosceles triangle shape, the hypotenuse of homonymy is parallel to each other in two hypotenuses of triangle-shaped board 28 and the V type groove 26, and two hypotenuses of triangle-shaped board 28 and two hypotenuses of V type groove 26 form two guide ways 29, the horizontal edge of triangle-shaped board 28 lower extreme is less than the lower extreme of spacing ring 25.

Be equipped with a set of jar material mechanism on the mounting plate 1 of 2 right rear sides of support column, jar material mechanism includes that two locate the support 30 on the mounting plate 1, and the upper end of two support 30 is connected with an arc slide rail 31, the centre of a circle of arc slide rail 31 and the coincidence of the centre of a circle of support column 2, be equipped with a sliding seat 32 on the arc slide rail 31, be equipped with an arc rack 33 on the outer terminal surface of arc slide rail 31, arc rack 33 and the outer lane face laminating fixed connection of arc slide rail 31, the last sliding connection of arc slide rail 31 has two sets of sliding groups, and is two sets of interval between the sliding group and the adjacent two sets of upset fixture is unanimous.

The sliding group comprises a vertical frame 34 arranged on the upper surface of the sliding seat 32, a transverse frame plate 35 is arranged at the upper end of the vertical frame 34, a guide rod 36 is arranged in the middle of the upper surface of the transverse frame plate 35, a sliding plate 37 is connected on the guide rod 36 in a sliding manner, a material pipe 38 is fixedly connected at the right end of the sliding plate 37, the lower end of the material pipe 38 is connected at the right end of the transverse frame plate 35 in a sliding manner, a feeding pipe 39 is connected at the upper end of the material pipe 38, a telescopic cylinder 40 is arranged at the right end of the transverse frame plate 35, and the extending end of the telescopic cylinder 40 is fixedly connected at the right end of the sliding plate 37.

A second driving motor 41 is arranged in the middle of the upper surface of the arc-shaped sliding rail 31, a second gear 16 is fixedly connected to a driving shaft of the second driving motor 41, and the second gear 16 is meshed with the arc-shaped rack 33.

The principle of the invention is as follows: firstly, push the filling bottle into the centre gripping group through outside mechanism, the filling bottle is at the in-process that pushes, push away frame 19 and is promoted inwards, push away the removal of frame 19 and drive two-sided rack 18 inwards to move, simultaneously because dentate structure 22 and two-sided rack 18 meshing in two turrets 21, the removal of two-sided rack 18 drives two turrets 21 rotatory, press from both sides tight the filling bottle, control first driving motor 8 and rotate, the rotation of first driving motor 8 drives annular ring 7 rotatory through first gear 9, thereby drive annular mounting bracket 11 rotatory, the rotation of annular mounting bracket 11 drives multiunit upset fixture rotatory, because gyro wheel 24 in the upset fixture rotates and connects on the lower terminal surface of spacing ring 25, thereby realize that spacing ring 25 is when rotatory, the unanimous horizontality that keeps of upset fixture, when the upset fixture revolves to first turn-over mechanism.

Because the horizontal edge of the lower end of the triangular plate 28 is lower than the lower end of the limiting ring 25, the roller 24 on the left side slides into the right guide groove 29 formed by the two bevel edges of the triangular plate 28 and the two bevel edges of the V-shaped groove 26, the annular mounting frame 11 continues to rotate, the roller 24 on the left side gradually slides upwards to drive the overturning clamping mechanism to rotate along the rotating shaft 12, the roller 24 on the right side overturns downwards, when the roller 24 on the left side reaches the top end, the roller 24 on the right side continues to move forwards, the roller 24 on the right side and the roller 24 on the left side realize position exchange, the roller 24 on the original left side slides out of the left guide groove 29 formed by the two bevel edges of the triangular plate 28 and the two bevel edges of the V-shaped groove 26 to complete overturning of the overturning clamping mechanism, the filling bottle is inverted, and when the overturning holding mechanism after overturning moves to the second overturning mechanism, the action at the position of the first overturning mechanism is repeated, and the inverted filling bottle is restored to the original state.

When the filling bottle moves to the material filling mechanism, the second driving motor 41 drives the sliding plate 37 to rotate synchronously with the annular mounting frame 11, the telescopic cylinders 40 in the two groups of sliding groups drive the two material pipes 38 to descend, the filling bottle is stretched into for filling, the filling bottle retracts after the filling is completed, the second driving motor 41 drives the material filling mechanism to move reversely, the filling bottle is filled again, the operation is circulated in sequence, the filling bottle after the filling is completed is taken out of the clamping group through an external mechanism, the filling bottle moves out, the rotating frame 21 is opened outwards, the pushing frame 19 is driven outwards reversely, and the initial state is recovered.

Finally, it should be noted that the above embodiments are merely representative examples of the present invention. It is obvious that the invention is not limited to the above-described embodiments, but that many variations are possible. Any simple modification, equivalent change and modification made to the above embodiments in accordance with the technical spirit of the present invention should be considered to be within the scope of the present invention.

Claims

1. The utility model provides a full-automatic filling equipment, includes mounting plate (1), its characterized in that: mounting plate (1) upper surface's intermediate position is equipped with a support column (2), the upper end of support column (2) is equipped with a mount pad (3), the upper surface of mount pad (3) has a plurality of first support frame (4) along the axis ring array of mount pad (3), be equipped with one annular slide rail (5) on the outer lane of mount pad (3), set up and both fixed connection with mount pad (3) coaxial line of annular slide rail (5), be equipped with a roating seat (6) on annular slide rail (5), roating seat (6) rotate to be connected on annular slide rail (5), be equipped with one annular ring gear (7) on the outer lane of roating seat (6), be equipped with two first driving motor (8) on mounting plate (1), two equal fixedly connected with one first gear (9) in the drive shaft of first driving motor (8), two first gear (9) all are connected with annular ring gear (7) meshing, annular ring gear (7) set up and both fixed connection with roating seat (6) coaxial line, the roating seat (6) upper surface of roating seat (6) equal fixedly connected in the second support frame (11) have a plurality of annular ring gear (11) upper surface ring array (10), the support frame (11) equal second support frame (11) upper surface ring seat (10) that the axis of annular support frame (11) is equipped with annular ring gear (11) the annular ring gear (6) is equal The lower end face of the rotary table is characterized in that the annular mounting frame (11) and the rotary seat (6) are coaxially arranged, a plurality of groups of overturning clamping mechanisms are arranged on the annular mounting frame (11) along an axis annular array of the annular mounting frame (11), each overturning clamping mechanism comprises a rotary shaft (12), the rotary shafts (12) are rotatably connected onto the annular mounting frame (11), the outer ends of the rotary shafts (12) are provided with an outward overturning plate (13), the outward overturning plates (13) are horizontally arranged, the outer ends of the outward overturning plates (13) are fixedly connected with the outer ends of the rotary shafts (12), two groups of clamping groups are arranged on the outer ring face of each outward overturning plate (13), the distances between every two adjacent groups of clamping groups are uniform, each group of clamping groups comprises an installation base (14), a guide cylinder (15) is arranged in the middle position of the outer end face of the installation base (14), a sliding cylinder (17) is arranged in the guide cylinder (15), the outer end of the sliding cylinder (17) is provided with a double-face rack (18), and the outer end of the double-face rack (18) is provided with a pushing frame (19).

2. The full-automatic filling equipment according to claim 1, wherein: two clamping supports (20) are symmetrically arranged on the mounting base (14) on two sides of the guide cylinder (15), the outer ends of the two clamping supports (20) are respectively provided with a rotating frame (21), the middle position of each rotating frame (21) is rotatably connected with the outer end of each clamping support, the middle position of the inner side of each rotating frame (21) is provided with a tooth-shaped structure (22), and the tooth-shaped structures (22) in the two rotating frames (21) are meshed with the double-sided rack (18).

3. The full-automatic filling equipment according to claim 2, wherein: the inner of rotation axis (12) is equipped with one interior turning plate (23), interior turning plate (23) and rotation axis (12) fixed connection, interior turning plate (23) level sets up, the both ends of interior turning plate (23) medial surface respectively are equipped with a gyro wheel (24), two gyro wheel (24) rotate with interior turning plate (23) and are connected.

4. A fully automatic filling apparatus according to claim 3, wherein: the top of mount pad (3) is equipped with a spacing ring (25), spacing ring (25) and mount pad (3) coaxial line set up, and is a plurality of the equal fixed connection in the lower terminal surface of spacing ring (25) in the upper end of first support frame (4), two gyro wheel (24) all rotate to be connected on the lower terminal surface of spacing ring (25), be equipped with first turn-over mechanism and second turn-over mechanism on spacing ring (25), the front end of spacing ring (25) is located to first turn-over mechanism, the left side of first turn-over mechanism is located to second turn-over mechanism, and the distance of mechanism is added in two sets of upsets in interval between first turn-over mechanism and the second turn-over mechanism.

5. The full-automatic filling equipment according to claim 4, wherein: first turn-over mechanism includes that one sets up V type groove (26) on spacing ring (25), be equipped with a connecting rod (27) on spacing ring (25) that V type groove (26) correspond, the lower extreme of connecting rod (27) is equipped with a triangle-shaped board (28), triangle-shaped board (28) are isosceles triangle-shaped, the hypotenuse of homonymy is parallel to each other in two hypotenuses of triangle-shaped board (28) and V type groove (26), and two hypotenuses of triangle-shaped board (28) and two hypotenuses of V type groove (26) form two guide ways (29), the horizontal limit of triangle-shaped board (28) lower extreme is less than the lower extreme of spacing ring (25).

6. The full-automatic filling equipment according to claim 5, wherein: be equipped with a set of jar material mechanism on mounting plate (1) of support column (2) right rear side, jar material mechanism includes that two locate support (30) on mounting plate (1), and the upper end of two support (30) is connected with an arc slide rail (31), the centre of a circle of arc slide rail (31) and the centre of a circle coincidence of support column (2), be equipped with a sliding seat (32) on arc slide rail (31), be equipped with an arc rack (33) on the outer terminal surface of arc slide rail (31), arc rack (33) and the outer lane face laminating fixed connection of arc slide rail (31), the last sliding connection of arc slide rail (31) has two sets of sliding groups, and is two sets of interval between the sliding group is unanimous with the interval between the adjacent two sets of upset fixture.

7. The full-automatic filling equipment according to claim 6, wherein: the sliding group is equipped with grudging post (34) including one locating sliding seat (32) upper surface, the upper end of grudging post (34) is equipped with a horizontal frame plate (35), the intermediate position of horizontal frame plate (35) upper surface is equipped with a guide bar (36), sliding connection has a sliding plate (37) on guide bar (36), the right-hand member fixedly connected with material pipe (38) of sliding plate (37), the lower extreme sliding connection of material pipe (38) is in the right-hand member of horizontal frame plate (35), the upper end of material pipe (38) is connected with a inlet pipe (39), the right-hand member of horizontal frame plate (35) is equipped with a telescopic cylinder (40), the end fixed connection that stretches out of telescopic cylinder (40) is in the right-hand member of sliding plate (37).

8. The full-automatic filling equipment according to claim 7, wherein: a second driving motor (41) is arranged in the middle of the upper surface of the arc-shaped sliding rail (31), a second gear (16) is fixedly connected to a driving shaft of the second driving motor (41), and the second gear (16) is meshed with the arc-shaped rack (33).