JPS5930647Y2 - Lift mechanism safety device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a safety device for a lift mechanism for raising and lowering a work machine in a mobile agricultural machine, and particularly to a safety device for a lift mechanism for a planting device in a riding rice transplanter.

Generally, in a riding rice transplanter, when the planting device is raised, the seedling stand of the planting device is easily aligned with the auxiliary seedling stand.
In addition, an upper limit stopper is provided to easily regulate the lift amount of the planting device when turning, etc., and also to prevent the planter from colliding with the ground and being damaged even when the planting device is lowered to the lowest position. A lower limit stopper is provided.

Further, in order to prevent the lift mechanism from being lowered by mistake or from lowering due to leakage when the lift mechanism is fully raised and fixed, a work implement lowering prevention stopper is provided.

However, conventionally, these stoppers have been provided separately, and in particular, the drop-prevention stopper has been achieved by passing a chain between the machine and the planting device.

Therefore, during planting work, it is necessary to remove the chain and store it somewhere else, which complicates the work and causes the chain to be lost.

Therefore, the present invention provides a safety device between the work machine and this machine at a position where the distance between the work machine and this machine expands and contracts as the work machine goes up and down, and the safety device is provided with a stopper. It has a connecting rod that can slide inside the boss, and by regulating the amount of sliding of the connecting rod, it forms upper and lower limit stoppers, and by rotating and locking the connecting rod at the upper limit position, it is possible to work. The object of the present invention is to provide a safety device for a lift mechanism, which constitutes a stopper to prevent the machine from descending, thereby eliminating the above-mentioned drawbacks.

Hereinafter, the present invention will be specifically explained based on embodiments shown in the drawings.

As shown in Fig. 1, the riding rice transplanter 1 has a main machine 5 supported by front wheels 2 and rear wheels 3, and an engine 6 is mounted on the front part of the main machine 5. A driver's seat 10 consisting of a steering wheel 7, a seat 9, etc. is arranged in the middle,
An auxiliary seedling stand 11 is fixed to the rear part.

Furthermore, at the rear of the machine 5, a planting device 13, which is a working machine, is supported by a lift mechanism 12 so as to be able to rise and fall freely.
It has a rank of 6.

The lift mechanism 12 also includes two lower links 17 and two upper links 18, as shown in detail in FIG.
The links 17 and 18 on the planting device 13 side are respectively pivotally supported by mouth-shaped brackets 20.

Arms 17a, 17a are fixed to the lower links 17, 17 on the machine 5 side, respectively, and each arm 17a is connected to a hydraulic cylinder device provided at the center of the rear of the machine via a rod 21, 21 and a balancer 22. It is connected to 23.

Further, the upper link 18 on the machine 5 side is pivotally supported by a shaft 25, and the center of the shaft 25 and the center of the shaft 20a that pivotally supports the lower link 17 of the bracket 20 on the planting device 13 side. A safety device 26 according to the present invention is provided between the two parts.

As shown in FIGS. 3 to 6, the safety device 26 has a link boss 27 and a stopper boss 29 that are pivotally supported on the shaft 25, and these bosses 27 and 29 are connected to each other by a joint pipe 30. It is fixed and forms an upper limit stopper surface 27a and a rotation gap 30a.

In addition, the stopper boss 29 has a hollow portion 29 extending over its entire length.
A cut groove 29b is formed along the line a, and a locking groove 29c is formed at one end with a phase difference of 180 degrees from the cut groove 29b.
is formed, and a screw 29d is further formed on the outer periphery of the other end.

A connecting rod 31 is fitted into a sliding material in the hollow portion 29a, and a protrusion 31a is formed at one end of the connecting rod 31.

Furthermore, a lid 32 is screwed onto the screw 29d.
is the protrusion 31 of the connecting rod 31 guided in the cut groove 29b.
The link boss 27, the stopper boss 29, and the lid 32 form a boss body.

Further, the other end of the connecting rod 31 is rotatably connected to a connecting rod 36 by a bolt 33 and a nut 35.
6 is pivotally supported on a shaft 20a.

Note that 37 in the figure is a handle provided on the connecting rod 31.

Since the present invention has the above-mentioned configuration, the planting device 13 is operated by the hydraulic cylinder device 23 via the lift mechanism 12.
Planting work is performed by holding the rice transplanter in the lowered position and operating the riding rice transplanter 1.

At this time, as the planting device 13 descends, the safety device 26 disposed on the diagonal line AB extends as shown in FIG. It is regulated by coming into contact with the surface 32a.

The lower limit regulation position is defined so that the lowest position of the movement trajectory C of the planter 14 is higher than the running surface position of the front wheels 2 and rear wheels 3 by a predetermined height H, and therefore the planting device 13 is not fully loaded. Even if it descends, the planter 15 will not collide with the tiller and be damaged during rice planting work.

Similarly, while driving on the road, the planting device 13
Even if the planter 14 is lowered and the planter 14 is driven, the planter 1
4 will not collide with the road surface.

Next, in order to redirect the riding rice transplanter 1 or to supply auxiliary seedlings, oil is supplied to the hydraulic cylinder device 23 and the lift mechanism 12
The planting device 13 is raised via the.

As the planting device 13 rises, the safety device 26 contracts as shown in FIG.
The tip is regulated by coming into contact with the upper limit stopper surface 27a.

The upper limit regulation position is defined so that the upper end of the seedling stand 15 of the planting device 13 is aligned with the auxiliary seedling stand 11, so that auxiliary seedlings can be easily supplied by pushing out the seedling tray.

Note that these upper and lower limit stopper surfaces 27a and 32
a, the connecting rod 31 is slid smoothly without rotating because its protrusion 31a is guided by the cut groove 29b of the stopper boss 29.

Furthermore, when the planting device 13 is held in an elevated state for on-road driving and storage, the planting device 13 is raised fully as described above, and the tip of the connecting rod 31 is moved to the upper limit stopper surface 27a.
comes into contact with.

In this state, the protrusion 31a of the connecting rod 31 is inserted into the rotation space 30.
a, so that the connecting rod 31 can be rotated.

As a result, when the connecting rod 31 is rotated 180 degrees while holding the handle 37, the protrusion 31a is aligned with the locking groove 29c, and the oil is slightly discharged from the hydraulic cylinder device 23, and the planting device 13
By lowering the protrusion 31a as shown in FIG.
is engaged with the locking groove 29C, so that the planting device 13 can be held in the raised position regardless of the hydraulic pressure leak phenomenon.

In addition, although the above-mentioned embodiment described the planting device 13 of the riding rice transplanter 1, this is not limited to this, and the same applies even when a working machine is supported on a tractor. Of course, the present invention is not limited to this type, and can also be applied to a tow bar type or a direct mounting type as shown in FIG.

As explained above, according to the present invention, the upper limit stopper, the lower limit stopper, and the work equipment lowering prevention stopper can be combined into one safety device 26, so the structure can be simplified and manufactured at low cost. .

In addition, unlike conventional chains, the stopper for preventing work equipment from descending does not need to be stored when not in use, so it does not get lost or the chain gets caught on other equipment, causing general damage to the equipment.

Further, since the safety device 26 is installed approximately at the center of the lift mechanism 12, even if a rolling force acts on the lift mechanism 12, it has almost no effect, and the connecting rod 31 is always guided by the cut groove 29b. It can slide smoothly and will not cause problems such as getting caught.

Further, when the handle 31 is provided on the connecting rod 31, the handle 37 can also serve as a matching mark, and the protrusion 31a can be easily engaged with the cut groove 29b or the locking groove 29c.

[Brief explanation of the drawing]

Fig. 1 is an overall side view showing a riding rice transplanter to which the present invention is applied, Fig. 2 is a perspective view showing its lift mechanism, Fig. 3 is a sectional view of the safety device according to the invention, Figs. Figures 5 and 6 correspond to Figure 3 ■-IV line, V-V line, and Vl-V, respectively.
7 is a sectional view of the safety device in a state different from that shown in FIG. 3, FIG. 8 is a diagram of the principle of operation, and FIG. 9 is a diagram of the principle of operation of another embodiment. 1... Mobile agricultural machine (riding rice transplanter), 5...
・This machine, 12... Lift mechanism, 13...
・Operator (planting device), 26...Safety device, 2
7,29.32...Boss body, 27a...
・Upper limit stopper surface, 29...stopper boss, 29c...locking groove, 31...connecting rod, 31a...protrusion, 32a...・Lower limit stopper surface.

Claims (1)

[Scope of utility model registration request] In a mobile agricultural machine in which a working machine is supported by a lift mechanism so that it can be raised and lowered, a boss body or a connecting rod is connected to the working machine and the main machine, and an upper limit stopper surface and a lower limit stopper surface are formed on both end surfaces of the boss body, respectively. At the same time, a rotation gap and a locking groove are formed adjacent to the upper limit stopper surface, and a protrusion is formed at the tip of the connecting rod to slidably guide the connecting rod tip into the boss body, The amount of sliding is regulated by the tip contacting the upper and lower limit stopper surfaces,
and a safety device for a lift mechanism configured such that the protrusion can be rotated in a rotation gap and engaged with a locking groove.