JPH0520085Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a ridge leveling machine, and in particular, to a ridge leveling machine that digs up muddy soil, mounds it up into old ridges, and pounds the raised soil with a ridge pounding board, the present invention uses a hydraulic pump and a piston device. The present invention relates to a mechanism that is provided so that the piston device operates smoothly when the ridge beating plate is operated by the piston device.

Ridges are built in rice fields to dam and store water, to create boundaries with other people's fields, or to serve as footpaths for agricultural work. Such ridges are considered to be good if they do not leak water, do not collapse even when people walk on them, and are stable without changing in height or width.

In order to create such ridges, conventionally, a tiller is used to make soil at the edge of the ridge, then the weathered soil and grass on the surface of the ridge is removed with a hoe, and then the soil is poured into the remaining area. Another method is to place it on top and beat it with a hoe. This method is the best method because the mixed soil has an oriented structure, so it hardens and hardens when it dries, but if you pile it too thick at once, it will cause large cracks when it dries, causing water leakage, so you can only pile it up by about 3 cm. , it was time-consuming to make adjustments while proceeding with the work, and there was a problem in saving labor in agricultural work.

Therefore, a ridge leveling machine was developed that mechanized the above-mentioned method of mounding the mixed soil with a hoe, but since this machine kneads soil and mud, it can only be used when there is a lot of water in the fields. For example, since it only lasts for a short period of time in early spring, it has the disadvantage of being limited in its usage period.In an attempt to improve this, a ridge leveling machine that replenishes water with a pump was developed, but it was labor-intensive and required less machinery. The operation was also cumbersome.

Next, a ridge adjustment machine was developed that improved these shortcomings and could be used throughout spring and autumn. This involves digging up soil with a rotor and mounding it up into ridges, then pounding the mounded soil with a roughly curved pounding board to compact the top and one side of the ridge.A ridge leveling machine is attached to a tractor. Since it is automated,
Workability has been improved over the previous model.

The ridge beating plate of this ridge leveling machine is connected to a rod provided on the power output shaft of the tractor via a crank mechanism, and is rotatably connected to two parallel links rotatably connected to the machine frame. It is operated by a so-called lever-crank mechanism connected to each other,
The rod is operated according to a constant movement in which the forward and backward movements are constrained by the deformation movement of the parallelogram by the two links.

Therefore, the pounding pressure of the ridge pounding board is applied only to the top surface of the ridge, and this pounding pressure is applied at a constant level regardless of the specific shape of the ridge, the hardness or softness of the soil being piled up, or the water content. Since it cannot be adjusted, when an abnormally large pressure is applied to the ridge, a problem arises in that the ridge is buried in the rice field. This is particularly likely to happen because a large amount of pounding pressure is applied to heap soil in dry fields and compact it into an oriented structure to form ridges.

By the way, when using a ridge adjustment machine to pound piled up soil, soil that can be plastically deformed and has a certain amount of moisture is good for workability and to eliminate water leakage, but the period when the soil is in the optimum moisture state is Extremely short. Therefore, from the side of designing the ridge straightening machine,
The soil that is piled up in the ridges can range from a rock-like solid to a muddy liquid depending on the condition of the field, so it is best to have a soil that can adjust the pounding pressure to suit each individual condition. preferable. but,
The above-mentioned ridge straightening machine using the lever-crank mechanism cannot satisfy this requirement.

A ridge straightening machine that can freely adjust the beating pressure of a ridge beating board has been disclosed in the specifications of other applications filed at the same time as the present application. In this ridge leveling machine, the ridge beating plate is directly attached to the piston rod of the piston device. Therefore, if this installation is done simply by fixing, if a biased external force is applied to the ridge beating plate that is in contact with the ridge embankment, a bending load will be applied to the piston rod, which will increase the friction between the piston head and the cylinder. This will hinder the smooth movement of the piston, but it is clear from the above specification that in order to prevent this, the ridge beating plate should be rotatably attached to the piston rod so that it can rotate according to external force. I made it.

However, even if the large bending load applied to the piston rod can be prevented, the gap between the cylinder and the piston is very small, so even if a small bending load is applied to the piston rod, the friction between the piston head and the cylinder will still occur. This can cause the piston to malfunction and, in severe cases, become inoperable.

In order to prevent this, it is necessary to reduce the frictional force of the portion where the piston head contacts the cylinder, that is, the piston ring, with respect to the cylinder.

However, since conventional piston rings are made of metal, there is a limit to how much they can reduce the coefficient of friction against a steel cylinder.

As described above, when the ridge beating plate is operated by a piston device, a bending load is applied to the piston rod, which increases the friction between the piston head piston and the steel cylinder, causing the piston to malfunction. In order to improve the problem that may occur, at least one of the one or more piston rings of the piston head for the steel cylinder is replaced with a polyacetal resin ring that has a small coefficient of dynamic friction and a lower modulus of elasticity than metal,
This allows the piston to operate smoothly even when a bending load is applied to the piston rod, and allows the piston device to operate the ridge beating plate. To provide a ridge straightening machine in which a plate is rotatably attached to a piston rod so as to face the ridge.

Next, one embodiment of the present invention will be described based on FIGS. 1 to 3.

In Fig. 1, T is a tractor and A is a ridge leveling machine.The machine frame 1 of the ridge leveling machine A is attached to a mounting frame a provided at the rear upper part of the tractor T via links b and c. It is rotatably connected to rotatable links d and e provided on both sides of the rear lower part of the tractor, and furthermore, the length of the front upper part of the machine frame 1 and the center of the rear upper part of the tractor can be adjusted freely. The ridge straightening machine A, which is connected by an adjustment link f and held at a predetermined angle by the adjustment link f, can be rotated downward via the mounting frame a, which is rotated by a hydraulic device (not shown); Further, by upward rotation of the mounting frame a by this hydraulic system, it is possible to return to the original position.

The above-mentioned ridge adjustment machine A has a power transmission shaft connected to a power take-off shaft g of a tractor via a universal joint (not shown), and a reducer 3 installed in a machine frame 1 shown in FIG.
A transmission shaft 4 is connected to the reducer 3, a rotor 5 is attached to the transmission shaft 4, and a ground plate 5' is connected between the transmission shaft 4 and the rotor 5.
is provided.

With this structure, the rotational force of the power transmission shaft is transmitted to the transmission shaft 4 by the speed reducer 3, which reduces the speed and changes the direction of rotation, and further, the rotation direction is reversed to the direction of rotation corresponding to the direction of travel of the tractor. As a result, the rotor 5 rotates with its axis oriented substantially perpendicularly to the direction of travel of the tractor and its rotational direction opposite to the direction of rotation corresponding to the direction of travel of the tractor. .

This rotor 5 has rotating blades 5a, 5b, 5
c, . . . are spirally spaced apart.

The cover plate 5' is provided with a cover plate 5'a that covers the top and both sides of the rotor.

Further, in the straightening machine A, a hydraulic pump 7 consisting of a piston and a cylinder is connected to the speed reducer 3 via a crank 6, a cross pipe 8 is connected to this hydraulic pump 7, and a cross pipe 8 is connected to the cross pipe 8. A hydraulic pressure adjustment device 9 and an air vent valve 10 are provided.

A flexible tube 11 made of rubber or the like is connected to the remaining tube end of the cross tube 8, and a piston device 12 is connected to this.

This piston device 12 is a cylinder 12 made of steel.
a and a piston 12b, this piston 12
b is the piston rod 12b- as shown in FIG.
1 and a piston head 12b-2 provided at the tip of this piston rod. This piston head is attached to the head body 12 on the head mounting member 12b-21 fitted to the piston rod 12b-1.
b-22 is fitted through an O-ring, and a piston ring 12b-23 is fitted to this head body.

Further, a resin ring 12b made of polyacetal resin and having a plate shape is provided between the head main body 12b-22 and a flange protruding from the head mounting member 12b-21 and abutting against the piston rod 12b-1.
-24 is fitted and clamped facing the piston rod side, and its circumferential side is slidably in close contact with the inner surface of the cylinder 12a due to its elasticity.

Similarly, the head mounting member 12b-2
A resin ring 12b similar to the resin ring 12-24 is attached to the protrusion from the head body 12b-22 of No. 1.
-25 is fitted in the opposite direction to the resin ring 12b-24, and is further clamped and fixed between the head body 12b-22 and the holding plate 12b-26 with bolts 12b-27, and the peripheral side portion thereof is attached to the inner surface of the cylinder 12a. Due to its elasticity, it is able to slide in close contact.

Piston rod 12b of the piston device 12
-1 is equipped with a substantially curved ridge striking plate 13 which can simultaneously strike the upper surface and one side of the ridge and is rotatable toward the ridge.

This ridge pounding board 13 rotates according to the external force even if a biased force is applied to one side of the ridge pounding board because the amount of soil piled up on the top surface or one side of the ridge varies depending on the condition of the soil being piled up. This prevents an excessive bending load from being applied to the piston rod, thereby preventing excessive friction between the piston head and the cylinder.

At the rear of the ridge beating plate 13, a molded plate 14 having a substantially similar shape is provided adjacent to it, and furthermore, a tail wheel 15 is provided on the opposite side of the machine frame 1, and this tail wheel 15 By penetrating into the soil, a reaction force is applied, and the ridge beating plate 13 and forming plate 14 can press well against the side surfaces of the ridge.

In addition, 16 is the above-mentioned ridge beating board 13 and molding board 14
This is a vertical position adjustment device that adjusts the vertical position of.

Next, the operation of this embodiment will be explained.

First, as shown in FIG. 1, the ridge leveling machine A is connected to a tractor T, enters a rice field, drives the power output shaft g, and operates the rotor 5 and the ridge beating plate 13.

The height of the entire ridge shaping machine is adjusted so that the rotating blades of the rotor 5 can penetrate one side of the ridge and the surface soil of the rice field, and the heights of the beating plate 13 and the ridge forming plate 14 are adjusted to the height of the ridge. . Then, the direction of the tail wheel 15 is adjusted to an acute angle rearward against the ridge.

In this state, when the tractor T is moved parallel to the ridge, the rotating blades 5a, 5b, 5c of the rotor 5...
At the same time as scraping one side of the ridge, the surface soil of the field is dug up, and the scraped and dug up soil is piled up in the ridge.

The soil thus piled up is pounded and compacted by a ridge-beating board 13, and further smoothed and shaped by a ridge-forming board 14.

Here, the hydraulic pressure adjustment device 9 is operated to adjust the hydraulic pressure, and the pressing force of the piston of the piston device 12 is adjusted to adjust the striking pressure of the ridge beating plate 13. The hydraulic pressure adjusted in this way causes the piston head 1 to
2b-2 is operated within the cylinder 12a, and piston rings 12b-23,
The resin rings 12b-24 and 12b-25 are slid in contact with each other, but the resin ring 12b-2
4 and 12b-25 have a lower coefficient of dynamic friction and a lower modulus of elasticity than metal piston rings, and are more resilient, so they can slide smoothly and can maintain close contact with each other to maintain liquid tightness.

This allows the entire piston head 12b-2 to operate smoothly in the cylinder 12a, so that even if a bending load is applied to the piston rod 12b-1, the function of the piston device will not deteriorate.

According to the present invention, a hydraulic mechanism including a hydraulic pump and a piston device is provided, the piston device operates the ridge beating plate, and one or more piston rings are provided on the piston head of the piston device,
At least one of the piston rings was replaced with a resin ring made of polyacetal resin, and the ridge beating plate was rotatably attached to the piston rod of this piston device toward the ridge, so that excessive bending load would not be applied to the piston rod. In addition, even when a bending load is applied, the coefficient of dynamic friction against a steel cylinder is smaller than that of a metal piston ring, and it has more elasticity than a metal piston ring, so it can be smoothly moved even without the use of lubricant. The slidable resin ring allows the piston to smoothly perform predetermined movements.

Thereby, normal operation of the piston is ensured even in response to any uneven external force that the ridge beating plate receives as a result of changes in the specific condition of the ridge, and workability can be improved.

In addition, compared to the conventional lever-crank mechanism that mechanically connects the above-mentioned links, the special hydraulic mechanism has fewer failures and noise, and unlike the commonly used hydraulic mechanisms with valves, the valves are free from dust and debris. The communication path does not need to be thick because the reciprocating movement of the oil is sufficient, so the oil circulation speed is reduced and no cooling device is required, making it possible to stably perform ridge preparation work for a long time. It can demonstrate excellent practicality as it can be carried out continuously.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an embodiment of the ridge straightening machine of the present invention in use, Fig. 2 is a partially cutaway rear view,
FIG. 3 is a longitudinal sectional view of the piston device of this ridge straightening machine. In the figure, A is the ridge straightening machine, 1 is the machine frame, 5 is the rotor, and 7
is a hydraulic pump, 12 is a piston device, 12b-1
is the piston rod, 12b-2 is the piston head, 12b-23 is the piston ring, 12b-2
4, 12b-25 is a resin ring, and 13 is a ridge beating board.

Claims (1)

[Scope of utility model registration request] A ridge leveling machine that has an earth mowing rotor that excavates mud in the machine frame and heaps it up into old ridges, and a ridge pounding plate that hammers and hardens the mud raised by this earth raising rotor, includes a hydraulic pump consisting of a piston and a cylinder, and this hydraulic pump. A piston device consisting of a piston operated by hydraulic pressure and a steel cylinder is provided, and the above-mentioned ridge beating plate is rotatably attached to the piston rod of this piston device toward the ridge. The piston head of the piston device is provided with one or more piston rings, and at least one of the piston rings is made of resin made of polyacetal resin. A ridge adjustment machine characterized by using a ring.