A kind of scallop machine of falling cage
Technical field
The present invention relates to a kind of automation equipment, in particular to a kind of scallop machine of falling cage.
Background technology
Scallop is a kind of seashell products for sea-farming that people eat, and its delicious meat is nutritious.At present, scallop
The major way of cultivation is cage raft culture, i.e., raft frame is set in sea area, then scallop seedling is placed on and hangs on raft frame
On breeding cage in cultivated.Breeding cage is the important utensil of cultured scallop, and most of existing breeding cage is etting layering
Formula breeding cage, it includes multiple demixing plates and the etting positioned at demixing plate periphery, two adjacent demixing plates and the common shape of etting
Into cage layer, demixing plate is hard nylon web plate, and etting is worked out using smooth nylon netting twine.Etting is provided with along its length
Etting at opening, opening reserves needs at certain overlapped surplus, opening and sew on altogether.
, then will with needlework, it is necessary to which spat is dispensed in each cage layer for entering scallop cage in scallop culture production
Etting opening is sutured.It is ripe scallop when spat is grown into process, breeding cage is pulled out in seawater, manually torn
Suture at etting opening, then operative employee scallop is taken out at etting opening with hand, it is big to there is workload in this process
And it is cumbersome, waste time and energy, cost is high, the problem of efficiency is low.
The content of the invention
The present invention be exactly in order to solve it is existing ripe scallop is manually taken out from scallop cultivation cage when workload it is big and
It is cumbersome, waste time and energy, cost is high, the low technical problem of efficiency saves manpower there is provided one kind is easy to operate, and cost is low, efficiency high
The scallop machine of falling cage.
The present invention provides a kind of scallop machine of falling cage, including framework, motor, power transmission shaft, the first cam, first connecting rod, first
Elevating lever, the first rocking arm, the second cam, second connecting rod, the second elevating lever, the second rocking arm, the first scallop cultivation cage connecting plate,
Two scallop cultivation cage connecting plates, first lifting seat, the second lifting seat, the first guide sleeve, the 3rd guide sleeve, first axis of guide and
Three axis of guides, motor is connected with framework, and power transmission shaft is connected on framework by bearings, and motor passes through transmission mechanism and transmission
Axle is connected;
The side of the right-hand member connection of first cam and power transmission shaft, the first elevating lever and framework, which is rotated, to be connected, and described first connects
The upper end of bar and the first cam are hinged, and the lower end of first connecting rod is connected with the first elevating lever, one end of the first rocking arm with
First elevating lever is hinged, and the other end and the first lifting seat of the first rocking arm are hinged;First guide sleeve and first lifting seat
It is fixedly connected, the first guide sleeve is enclosed on first axis of guide;The upper end of first axis of guide and the top of framework are connected, lower end and frame
The bottom connection of frame;First scallop cultivation cage connecting plate links together with first lifting seat;
The side of the left end connection of second cam and power transmission shaft, the second elevating lever and framework, which is rotated, to be connected, second connecting rod
Upper end and the second cam are hinged, and the lower end of second connecting rod is connected with the second elevating lever, one end of the second rocking arm and second
Elevating lever is hinged, and the other end of the second rocking arm is hinged with the second lifting seat;3rd guide sleeve is fixed with the second lifting seat
Connection, the 3rd guide sleeve is respectively fitted over the 3rd axis of guide;The upper end of 3rd axis of guide and the top of framework are connected, lower end and framework
Bottom connection;Second scallop cultivation cage connecting plate links together with the second lifting seat.
Preferably, it is connected with the first elastic overhead gage and the second elastic lower baffle plate, the first elasticity and keeps off on the first elevating lever
Plate and the second elastic lower baffle plate clamp the first rocking arm;The 3rd elastic overhead gage, the 4th elastic lower block are connected with second elevating lever
Plate, the 3rd elastic overhead gage and the 4th elastic lower baffle plate clamp the second rocking arm.
Preferably, the first jointed shaft is connected with first lifting seat, one end of the first rocking arm is hinged on the first elevating lever
Together, the other end of the first rocking arm is provided with the first hinge hole, and the first jointed shaft passes through the first hinge hole;Connected on second lifting seat
There is the second jointed shaft, one end of the second rocking arm and the second elevating lever are hinged, the other end of the second rocking arm is provided with the second hinge
Hole is connect, the second jointed shaft passes through the second hinge hole.
Preferably, linear bearing is connected between the first guide sleeve and first axis of guide, the 3rd guide sleeve and the 3rd are oriented to
Linear bearing is connected between axle.
Preferably, the bottom of framework is connected with the first limiting section and the second limiting section, and the first limiting section, the second limiting section are used
The distance moved down in the first scallop cultivation cage connecting plate of limitation;The bottom of framework is connected with the 3rd limiting section and the 4th spacing
Portion, the 3rd limiting section and the 4th limiting section are used to limit the distance that the second scallop cultivation cage connecting plate is moved down.
Preferably, the first extension spring is connected between framework and the first elevating lever, is connected between framework and the second elevating lever
Second extension spring;Transmission mechanism includes toothed disc and chain, and toothed disc is connected with power transmission shaft, and the output shaft of motor passes through chain and tooth
Wheel disc is connected.
Preferably, crossbeam is connected between the first scallop cultivation cage connecting plate and the second scallop cultivation cage connecting plate, it is horizontal
It is connected with beam on cord expander, cord expander and is connected with tension rope;The right-hand member for tensing rope is connected with the first hook,
Left end is connected with the second hook;Cord expander includes handle of tensioning device, unlocking handle, right suspension wire wheel, left suspension wire wheel, Zola
Spring, right extension spring, right-hand member wire leading wheel and left end wire leading wheel, are connected between the handle of tensioning device and unlocking handle by lock pin, are drawn
Tight device handle is connected on crossbeam by handle of tensioning device rotating shaft, and unlocking handle is connected on crossbeam by unlocking handle rotating shaft,
The first tensioning wheel and the second tensioning wheel are connected with handle of tensioning device, right-hand member wire leading wheel is connected to the right-hand member of crossbeam, left end lead
Wheel is connected to the left end of crossbeam;One end of right extension spring is connected on crossbeam, and the other end is connected with right suspension wire wheel;One end of Zola's spring
It is connected on crossbeam, the other end is connected with left suspension wire wheel;Right suspension wire wheel is located at the right side of handle of tensioning device, and left suspension wire wheel, which is located at, to be drawn
The left side of tight device handle;
The bottom of first scallop cultivation cage connecting plate is connected with right fixed block, the bottom of the second scallop cultivation cage connecting plate
It is connected with left fixed block;
Tense rope and first bypass right-hand member wire leading wheel, further around the first tensioning wheel is crossed, further around excessively right suspension wire wheel, further around excessively left messenger wire
Wheel, further around the second tensioning wheel is crossed, further around left end wire leading wheel is crossed, is connected with the second hook by left fixed block, tenses still further below
The other end of rope bypasses right-hand member wire leading wheel and is connected by right fixed block with the first hook downwards.
Preferably, it is connected with the first steel wire between the first scallop cultivation cage connecting plate and the second scallop cultivation cage connecting plate
Rope, the second steel wire rope, the 3rd steel wire rope and the 4th steel wire rope.
Preferably, the end of the second elevating lever and the first elevating lever is connected with fan-shaped position-limited box, and position-limited box is by two pieces
Plate is formed by connecting, and is provided between two boards at the top of space, the right-hand member of position-limited box and is provided with upper flange, right-hand member bottom is similarly provided with down
Flange.
The beneficial effects of the invention are as follows realize automated job, save manpower, cost is low, efficiency high.Present invention application
Extensively, it can apply during the automatic processing of other shellfishes, can be applied in other products and topple over processing operation
In.
Further aspect of the present invention and aspect, by the description below with reference to the embodiment of accompanying drawing, are able to
It is clearly stated that.
Brief description of the drawings
Fig. 1 is the front view of the scallop machine of falling cage;
Fig. 2 is the top view of the scallop machine of falling cage;
Fig. 3 is the right view of the scallop machine of falling cage;
Fig. 4 is the left view of the scallop machine of falling cage;
Fig. 5 is first lifting seat and the first rocking arm attachment structure schematic diagram;
Fig. 6 is the second lifting seat and the second rocking arm attachment structure schematic diagram;
Fig. 7 is the schematic diagram that scallop cultivation cage is arranged on the scallop machine of falling cage;
Fig. 8 is that the structure of connecting steel wire ropes between the first scallop cultivation cage connecting plate and the second scallop cultivation cage connecting plate is shown
It is intended to;
Fig. 9 is the left view of structure shown in Fig. 8;
Figure 10 is the scallop machine of the falling cage structural representation for being mounted with cord expander;
Figure 11 is the structural representation of cord expander;
Figure 12 is the schematic diagram that structure shown in Figure 11 removes rope;
Figure 13 is the structural representation that position-limited box is installed on the second elevating lever;
Figure 14 is the top view of position-limited box in Figure 13;
Figure 15 is the upward view of position-limited box in Figure 13.
Symbol description in figure:
1. framework, 2. motors, 3. toothed discs, 4. chains, 5. power transmission shafts, 6. first fixing bearings, 7. second fixing bearings,
8. the first cam, 9. first connecting rods, 10. first extension springs, 11. first elevating levers, 12. first rocking arms, the hinge holes of 12-1. first,
13. the first hook, 14. second hooks, 15. Zola's springs, 16. crossbeams, 17. ropes, 18. right extension springs, the right suspension wire wheels of 19-1., 19-
2. left suspension wire wheel, 20. handle of tensioning device, the tensioning wheels of 20-1. first, the tensioning wheels of 20-2. second, 21. lock pins, 22. unlocking handles,
23. right fixed block, 24. left fixed blocks, 25. the 3rd fixing bearings, 26. second cams, 27. second connecting rods, 28. second draw
Spring, 29. second elevating levers, 30. second rocking arms, the hinge holes of 30-1. second, 31. first scallop cultivation cage connecting plates, 32. second
Scallop cultivation cage connecting plate, 33. first limiting sections, 34. second limiting sections, 35. the 3rd limiting sections, 36. the 4th limiting sections, 37.
First lifting seat, the jointed shafts of 37-1. first, 38. second lifting seats, the jointed shafts of 38-1. second, 39. first guide sleeves, 40.
Two guide sleeves, 41. the 3rd guide sleeves, 42. the 4th guide sleeves, 43. first axis of guides, 44. second axis of guides, 45. the 3rd are oriented to
Axle, 46. the 4th axis of guides;47. the first elastic overhead gage, 48. second elastic lower baffle plates, 49. the 3rd elastic overhead gages, 50. the
Four elastic lower baffle plates, 51. scallop cultivation cages.52. the first steel wire rope, 53. second steel wire ropes, 54. the 3rd steel wire ropes, 55. the 4th
Steel wire rope;56. right-hand member wire leading wheel, 57. left end wire leading wheels, 58. unlocking handle rotating shafts, 59. handle of tensioning device rotating shafts, 60. is spacing
Box, flange, 62. lower gear sides on 61..
Embodiment
As shown in figures 1 to 6, the scallop machine of falling cage includes framework 1, motor 2, toothed disc 3, chain 4, power transmission shaft 5, the first cam
8th, first connecting rod 9, the first extension spring 10, the first elevating lever 11, the first rocking arm 12, the second cam 26, second connecting rod 27, the second extension spring
28th, the second elevating lever 29, the second rocking arm 30, the first scallop cultivation cage connecting plate 31, the second scallop cultivation cage connecting plate 32, first
Lifting seat 37, the second lifting seat 38, the first guide sleeve 39, the second guide sleeve 40, the 3rd guide sleeve 41, the 4th guide sleeve 42,
Under one axis of guide 43, second axis of guide 44, the 3rd axis of guide 45, the 4th the 46, first elastic overhead gage 47 of the axis of guide, the second elasticity
The elastic lower baffle plate 50 of the elastic overhead gage the 49, the 4th of baffle plate the 48, the 3rd, motor 2 is arranged on the top of framework 1, and power transmission shaft 5 passes through the
One fixing bearing 6, the second fixing bearing 7, the support of the 3rd fixing bearing 25 are installed in the top of framework 1.Toothed disc 3 and power transmission shaft
5 middle part connection, the output shaft of motor 2 is connected with driving tooth wheel disc, and driving tooth wheel disc is connected by chain 4 with toothed disc 3.Electricity
The output shaft of machine 2 drives power transmission shaft 5 to rotate by the transmission mechanism of driving tooth wheel disc, toothed disc 3, the composition of chain 4.
First cam 8 is connected with the right-hand member of power transmission shaft 5, and the first elevating lever 11 rotates with the side of framework 1 and is connected (first liter
Dropping bar 11 can be using rotating junction as fulcrum), the upper end of first connecting rod 9 and the first cam 8 are hinged, and first connects
The lower end of bar 9 is fixedly connected with the first elevating lever 11, the first extension spring 10 be connected to framework 1 top and the first elevating lever 11 it
Between.The first jointed shaft 37-1 (the first jointed shaft 37-1 is located at the outside of a lifting seat 37) is connected with first lifting seat 37, the
One end of one rocking arm 12 and the first elevating lever 11 are hinged, and the other end of the first rocking arm 12 is provided with the first hinge hole 12-1.
First jointed shaft 37-1 passes through the first hinge hole 12-1, realizes that the rocking arm 12 of first lifting seat 37 and first is hinged.It is arranged side by side
First guide sleeve 39, the second guide sleeve 40 are welded in first lifting seat 37, and the first guide sleeve 39, the second guide sleeve 40 cover respectively
On first axis of guide 43, second axis of guide 44.The upper end of first axis of guide 43 is connected with the top of framework 1, lower end and framework 1
Bottom connection.The upper end of second axis of guide 44 is connected with the top of framework 1, and lower end is connected with the bottom of framework 1.First is oriented to
Axle 43, second axis of guide 44 are vertically arranged side by side.First scallop cultivation cage connecting plate 31 is welded with first lifting seat 37
Together, the first scallop cultivation cage connecting plate 31 is located at the inner side of first lifting seat 37.The first elastic bullet of overhead gage 47 and second
Property end of the lower baffle plate 48 respectively with the first elevating lever 11 be connected, the first elastic elastic lower baffle plate 48 of overhead gage 47 and second is clamped
First rocking arm 12, the first rocking arm 12 is located between the first elastic elastic lower baffle plate 48 of overhead gage 47 and second.
The bottom of framework 1 is connected with the first limiting section 33, the second limiting section 34, the first limiting section 33, the second limiting section 34
Effect be to limit the distance that the first scallop cultivation cage connecting plate 31 is moved down.
Second cam 26 is connected with the left end of power transmission shaft 5, and the second elevating lever 29 rotates with the side of framework 1 and is connected (second
Elevating lever 29 can be using rotating junction as fulcrum), the upper end of second connecting rod 27 and the second cam 26 are hinged, the
The lower end of two connecting rods 27 is fixedly connected with the second elevating lever 29, and the second extension spring 28 is connected to top and the second elevating lever of framework 1
Between 29.The second jointed shaft 38-1 is connected with second lifting seat 38, and (the second jointed shaft 38-1 is located at the outer of the second lifting seat 38
Side), one end of the second rocking arm 30 and the second elevating lever 29 are hinged, and the other end of the second rocking arm 30 is provided with the second hinge hole
30-1.Second jointed shaft 38-1 passes through the second hinge hole 30-1, realizes that the second lifting seat 38 and the second rocking arm 30 are hinged.Set side by side
The 3rd guide sleeve 41, the 4th guide sleeve 42 put are welded on the second lifting seat 38, the 3rd guide sleeve 41,42 points of the 4th guide sleeve
The 3rd axis of guide 45 is not enclosed on, on the 4th axis of guide 46.The upper end of 3rd axis of guide 45 is connected with the top of framework 1, lower end with
The bottom connection of framework 1.The upper end of 4th axis of guide 46 is connected with the top of framework 1, and lower end is connected with the bottom of framework 1.The
Three axis of guides 45, the 4th axis of guide 46 are vertically arranged side by side.Second scallop cultivation cage connecting plate 32 and the second lifting seat
38 weld together, and the second scallop cultivation cage connecting plate 32 is located at the inner side of the second lifting seat 38.3rd elastic overhead gage 49, the
End of the four elastic lower baffle plates 50 respectively with the second elevating lever 29 is connected, the 3rd elastic elastic lower baffle plate 50 of overhead gage the 49, the 4th
The second rocking arm 30 is clamped, the second rocking arm 30 is located between the 3rd elastic elastic lower baffle plate 50 of overhead gage 49 and the 4th.
The bottom of framework 1 is connected with the 3rd limiting section 35, the 4th limiting section 36, the 3rd limiting section 35, the 4th limiting section 36
Effect be to limit the distance that the second scallop cultivation cage connecting plate 32 is moved down.First extension spring and the effect of the second extension spring
It is that, when the first elevating lever, the second elevating lever are moved down, the pulling force upward to elevating lever plays cushioning effect.
As shown in fig. 7, the inner side of the first scallop cultivation cage connecting plate 31 is connected with the first hook 13, the second scallop cultivation cage
The inner side of connecting plate 32 is connected with the second hook 14.
The course of work of the above-mentioned scallop machine of falling cage is described below:
The one end for the scallop cultivation cage 51 for filling ripe scallop pulled out in seawater is connected with the first hook 13, it is another
End is connected with the second hook 14.
Start motor 2, the driving power transmission shaft 5 of motor 2 rotates, and power transmission shaft 5 drives the first cam 8, the second cam 26 to rotate, the
One cam 8 drives the first elevating lever 11 to pump by first connecting rod 9, while the second cam 26 passes through second connecting rod 27
The second elevating lever 29 is driven to pump.First elevating lever 11 is driven by the first rocking arm 12 and is connected with first lifting seat 37
The first guide sleeve 39, the second guide sleeve 40 pumped on first axis of guide 43, second axis of guide 44, first
Scallop cultivation cage connecting plate 31 pumps with first lifting seat 37.Similarly, the second scallop cultivation cage connecting plate 32
Pump.So, scallop cultivation cage 51 just up and down reciprocatingly vibrates, and the scallop in breeding cage will be automatically from etting opening
Place is fallen down, and then scallop is collected again.
In the above-mentioned course of work, due to the second elastic lower baffle plate 48 can elastic deformation, when the first elevating lever 11 is upward
During motion, the thrust that the second elastic lower baffle plate 48 can be upward to the first rocking arm 12, when the first elevating lever 11 is moved downward, first
The elastic meeting of overhead gage 47 pressure downward to the first rocking arm 12, is so advantageous for the first rocking arm 12 and drives first lifting seat 37 steady
Fixed pumps, and the amplitude of first lifting seat 37 is more stablized.Similarly, the 3rd elastic elasticity of overhead gage the 49, the 4th
The effect of lower baffle plate 50 is identical.
In order that the first guide sleeve 39, the second guide sleeve 40, the 3rd guide sleeve 41, the 4th guide sleeve 42 are more anxious reliable and stable
Moved on the axis of guide, linear bearing can be installed on guide sleeve, the axis of guide is passed through linear bearing.
Scallop cultivation cage 51 is in up and down reciprocatingly vibration processes, it is possible to the position skew in occurred level direction, in order to anti-
Only breeding cage is rocked in the horizontal direction, as shown in FIG. 8 and 9, in the first scallop cultivation cage connecting plate 31 and the second scallop cultivation cage
First steel wire rope 52, the second steel wire rope 53, the 3rd steel wire rope 54, the 4th steel wire rope 55, the 3rd steel wire are installed between connecting plate 32
The steel wire rope 55 of rope 54 and the 4th, which is one group, prevents breeding cage from moving right in the horizontal direction, the first steel wire rope 52 and the second steel wire rope
53 be one group prevent breeding cage to be moved to the left in the horizontal direction, this ensures that breeding cage can only vertically on move down
It is dynamic.
In order to allow the scallop cultivation cage for being arranged on the first scallop cultivation cage connecting plate and the second scallop cultivation cage connecting plate to exist
Horizontal direction is opened completely, and Optimal improvements are carried out in the structure of the foregoing scallop machine of falling cage.Concrete structure as shown in figs. 10-12,
(the crossbeam 16 of crossbeam 16 is installed at the top of the first scallop cultivation cage connecting plate 31 and the top of the second scallop cultivation cage connecting plate 32
It is horizontally oriented), cord expander is installed on crossbeam 16, rope is tensed and is connected on cord expander, the first hook 13
It is connected with the right-hand member for tensing rope, the second hook 14 is connected with tensing the left end of rope.Cord expander includes handle of tensioning device
20th, unlocking handle 22, right suspension wire wheel 19-1, left suspension wire wheel 19-2, Zola's spring 15, right extension spring 18, right-hand member wire leading wheel 56, left end draw
Line wheel 57, is connected between handle of tensioning device 20 and unlocking handle 22 by lock pin 21, and handle of tensioning device 20 passes through handle of tensioning device
Rotating shaft 59 is connected on crossbeam 16, and unlocking handle 22 is connected on crossbeam 16 by unlocking handle rotating shaft 58.Handle of tensioning device 20
On be connected with the first tensioning wheel 20-1, the second tensioning wheel 20-2, right-hand member wire leading wheel 56 is connected to the right-hand member of crossbeam 16, left end lead
Wheel 57 is connected to the left end of crossbeam 16.One end of right extension spring 18 is connected on crossbeam 16, and the other end is connected with right suspension wire wheel 19-1;
One end of Zola's spring 15 is connected on crossbeam 16, and the other end is connected with left suspension wire wheel 19-2.Right suspension wire wheel 19-1 is located at strainer
The right side of handle 20, left suspension wire wheel 19-2 is located at the left side of handle of tensioning device 20.
Handle of tensioning device 20, unlocking handle 22 in Figure 11 and 12 are pinned by lock pin 21, are in the lock state, and are incited somebody to action when with hand
Handle of tensioning device 20 and unlocking handle 22 are broken into two with one's hands, and handle of tensioning device 20 presses arrow side in figure with handle of tensioning device rotating shaft 59 for branch
To turning an angle, unlocking handle 22 handle of tensioning device 20 and is opened with 58 fulcrum certain angles of unlocking handle rotating shaft
Lock handle 22 is unlocked, and handle of tensioning device 20 and unlocking handle 22 are at open configuration.
Right fixed block 23 is arranged on the bottom of the first scallop cultivation cage connecting plate 31, and left fixed block 24 is arranged on second
The bottom of scallop cultivation cage connecting plate 32.
The rope 17 of tension is first bypassed into right-hand member wire leading wheel 56, further around the first tensioning wheel 20-1 is crossed, further around excessively right messenger wire
19-1 is taken turns, further around excessively left suspension wire wheel 19-2, further around the second tensioning wheel 20-2 is crossed, left end wire leading wheel 57 is then passed around, passes through still further below
Cross left fixed block 24 to be connected with the second hook 14, the other end of rope 17 bypasses right-hand member wire leading wheel 56 downwards by right fixed sliding
Wheel 23 is connected with the first hook 13.
With reference to Figure 11, when handle of tensioning device 20 and unlocking handle 22 are pinned by lock pin 21, the second tensioning wheel 20-2 will be connected
Rope on left end wire leading wheel 57 is drawn to the right, and Zola's spring 15 is opened;First tensioning wheel 20-1 will be connected to right-hand member wire leading wheel
Rope on 56 is to Zola, and right extension spring 18 is opened, and whole rope 17 is in tight state, and the second hook 14 tenses scallop to the left
Breeding cage, the first hook 13 tenses to the right scallop cultivation cage, and whole scallop cultivation cage is fully withdrawn to greatest extent, is easy to fan
Shellfish drops out at opening.
As illustrated in figs. 13-15, can be to rotate connection between the second rocking arm 30 and the second elevating lever 29, concrete structure can be with
Realized using structure known to rotating shaft and bearing etc..In actual production operation, it is possible to occur the 3rd elastic overhead gage 49, the
The situation that four elastic lower baffle plates 50 are broken, the amplitude that now the second rocking arm 30 pumps will become big, in order to ensure to shake
Width is basically unchanged, and it is spacing to be carried out to the second rocking arm 30 to set position-limited box 60.
The left end of position-limited box 60 is connected with the end of the second elevating lever 29, right-end openings.Overall position-limited box 60 is in sector, its
Left end is small head, and right-hand member is enlarged head.Position-limited box 60 is formed by connecting by two boards, is formed as the second rocking arm 30 in the middle of two boards
The space of offer is provided.Upper flange 61 is provided with the top of the right-hand member of position-limited box 60, right-hand member bottom is similarly provided with lower gear side 62.
The elastic lower baffle plate 50 of the elastic overhead gage the 49, the 4th of second rocking arm the 30, the 3rd is located in the space in position-limited box 60, the second rocking arm 30
Position-limited box 60 is stretched out in the part being connected with the second lifting seat 38.
When the 3rd elastic elastic lower baffle plate 50 of overhead gage the 49, the 4th is broken, the second rocking arm 30 is moved up, and is performed
Block the second rocking arm 30 to limit the displacement of the second rocking arm 30 in side 61;Second rocking arm 30 is moved down, and lower gear side 62 blocks
Two rocking arms 30 are so as to limit the displacement of the second rocking arm 30.
Similarly, one position-limited box is also installed in the position of the first rocking arm 12.
It is described above to be not intended to limit the invention only to the preferred embodiments of the present invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.