JPS6030892Y2 - rice transplanter - Google Patents

Description

[Detailed description of the invention] The invention is based on the ground pressure of the seedling planting device, which moves the seedling planting device that is connected and supported by the machine body so as to be able to move up and down, so that the seedlings are planted at a constant depth. Regarding the rice transplanter.

Conventionally, this type of rice transplanter is configured such that the machine body supports a seedling planting device so as to be able to move up and down, and the seedling planting device is moved up and down by a lifting device, and the machine body is equipped with a control unit that controls the driving of the lifting device. In addition, a detecting section for detecting the ground pressure of the seedling planting device is provided on the lower surface of the float of the seedling planting device, and the control section is configured to operate based on the detected value by this detecting section.

However, in such a structure, the control section and the detection section must be interlocked and connected by wires, electric wires, hydraulic hoses, etc., which results in a complicated structure and high cost, and the risk of breakage of the interlocking member. In addition, there is a time delay between the detection unit detecting the ground pressure of the seedling planting device, transmitting the detected value to the control unit, and moving the seedling planting device up and down. , and there were problems such as a drop in sensitivity due to loss during transmission of the detected value.

Therefore, the present invention was devised to solve the above-mentioned problems.The purpose of this invention is to reduce the cost by having an extremely simple structure, to reduce the possibility of failure, and to control the ground pressure of the seedling planting device with a time lag. To provide a rice transplanter that can perform rice transplantation quickly and with high sensitivity.

That is, the present invention provides a pair of first and second parts that are movable relative to each other.
of these members, the first member is connected to the machine body side, and the second member is connected to the seedling planting device side, so that both the members constitute the support link, and each of the members One of the members is provided with a control section that controls the drive of the lifting device, and a detection section that detects the ground pressure of the seedling planting device is formed by relative movement of each of the members, and the detection section is controlled by the control section. The device is characterized in that it is configured to operate directly on the control element of the section.

Embodiments of the present invention will be described below based on illustrative drawings.

In the figure, 1 is a front fuselage 1 with a pair of front wheels 2, 2.
A and a rear fuselage 1b having two pairs of rear wheels 3, 3, and the front wheels 2゜2 and rear wheels 3, 3 are driven by a prime mover 4 mounted on the rear fuselage 1b. , the aircraft 1 is configured to run.

A pilot seat 5 and a steering shaft 6 having a steering wheel 7 are provided on the front body 1a.

Reference numeral 8 denotes a device 8, which is composed of a main body casing 9 having planting claws 10, a seedling stand 11 mounted on the casing 9, a float 12 supported at the lower part of the main casing 9, etc., attached to the front body. Lower link 13 in 1a.

13 and via support links such as the top link 14 so as to be vertically movable, and one end of the suspension rods 16, 16 is pivotally connected to a swinging arm 15.15 pivotally supported on the front body 1a. , pins 18 , 18 protruding from the lower links 13 , 13 are inserted into long holes 17 , 17 formed at the other ends of the suspension rods 16 , 16 , and the swing arm 15 .

15 and this pin 18.A spring 19,
19 interposed therebetween, the lower link 13.

13 is supported by a swinging arm 15.15, and the arm 15
, 15 to swing the lower links 13 and 13 to move the seedling planting device 8 up and down with respect to the body 1.

Further, an operating rod 20 protruding from the shafts of the swinging arms 15, 15 is interlocked and connected to a lifting device 21, and the lifting device 21 swings the lower links 13, 13 via the swinging arms 15.15. The seedling planting device 8 is configured to move up and down as described above.

Further, 22 in the figure is a spring for assisting in pulling up the seedling planting device 8.

Therefore, the present invention provides a rice transplanter with the above structure.
A first member that is relatively movable and is hollowed out from the housing (
A certain second member (hereinafter referred to as a rod) 14b is formed from a rod and a casing 14a (hereinafter referred to as a casing), and a second member (hereinafter referred to as a rod) 14b is formed between the casing 14a and the rod 14b.
A is connected to the body 1, and a rod 14b is connected to the seedling planting device 8 side, and the casing 14a and rod 14b constitute the top link 14, and a control for controlling the drive of the lifting device 21 is provided in the casing 14a. a detection unit 23 that detects ground pressure of the seedling planting device 8 through relative movement between the casing 14a and the rod 14b;
A certain control device 23 is provided from b.

The control section 23a includes a valve body 24 having an inflow path 25 and an outflow path 26.

A control element for controlling the communication state between the inflow passage 25 and the outflow passage 26 within the valve body 24, that is, the valve body 27, a support body 29 that supports the valve rod 28 extending from the valve body 27, and this support body 29. and a spring 3 interposed between the valve body 27 and the valve body 27.
0, and the detection section 23b includes a detection rod 31 fitted into the valve body 24 so as to be movable in the axial direction, a receiver 32 fixed to the tip of the detection rod 31, A receiver 33 received on the casing 14a side in the middle of this detection rod 31, and both receivers 32, 33
The support body 29 of the control section 23a is directly received by one receiver 32 of the detection section 23b, and the detection section The ground pressure of the seedling planting device 8 detected by 23b is directly transmitted to the valve body 27.

Further, the control device 23 is provided with a switching mechanism that changes the elasticity of the spring 34 to switch the ground pressure setting.

This switching mechanism consists of cams 35, 35 and an operating lever 36, and a ring 39 is attached to the detection rod 31 of the detection section 23b.
is inserted so that the receiving ring 39 is brought into contact with the stepped portion 40 of the detection rod 31, and the shaft portion 37 of the operating lever 36 is moved from one side wall of the casing 14a to the other side wall to the detection rod 31. A shaft is inserted through the formed axial long hole 38, and the cam 35.35 is mounted on this shaft portion 37, and the receiving ring 39 and the receiving body 3 are
It is inserted and fixed so that it is positioned between 3 and 3.

This causes the operating lever 36 to operate the cam 35.
35, the receiver 33 moves to one side in the axial direction to compress the spring 34, increasing the elasticity of the spring 34, or the receiver ring 39 moves to the other side in the axial direction. , the detection rod 31 is moved backward via the stepped portion 40.

Thus, the rod 14b of the top link 14 is connected to the detection rod 31 of the detection section 23b in the control device 23 configured as described above, and the control section 23a
The inlet passage 25 is communicated with one boat on the inlet side and one boat on the outlet side of the four-boat three-position switching valve 41, and the outlet passage 26 is opened to the tank 42.

The other boat on the inflow side of this switching valve 41 is connected to the hydraulic pump 43, and the other boat on the outflow side is connected to the lifting device 21.
is connected to.

The rice transplanter of the present invention is configured as described above, and when the rice transplanter 1 is run and the seedling planting device 8 is used to plant seedlings,
As will be described later, the control device 23 controls the driving of the lifting device 21, and the swinging arm 15.15, the suspension rods 16, 16,
The seedling planting device 8 is suspended from the body 1 via the lower links 13, 13 so as to maintain a set ground pressure.

However, the seedling planting device 8 tries to turn forward using the pivot position to the lower links 13, 13 as a fulcrum,
When the seedling planting device 8 is not in contact with the ground and the so-called ground pressure is zero (minimum), the turning force is maximum, and when the seedling planting device 8 is in contact with the ground and the ground pressure increases, this turning force becomes smaller. .

Therefore, a forward turning force acts on the seedling planting device 8 suspended from the body 1 as described above, the top link 14 is pulled forward, and the detection rod 31 of the detection section 23b in the control device 23 is When the seedling planting device 8 is moved in the compression direction of the spring 34 (to the left in the figure) and the ground pressure increases, the turning force becomes smaller and the detection rod 31 is moved in the extension direction due to the elasticity of the spring 34. (to the right in the figure),
When the elasticity of the spring 34 and the turning force are balanced, the movement of the detection rod 31 is stopped.

Along with this, the support body 29 of the control section 23a is received at a predetermined position by the receiver 32 of the detection section 23b, the elastic force of the spring 30 is adjusted, and the pressing force of the valve body 27 by this spring 30 is set. are doing.

On the other hand, by switching the switching valve 41 from the illustrated position to the right, pressure oil from the hydraulic pump 43 is transferred to the control section 23a.
The pressure oil flows into the inlet passage 25, acts on the valve body 27, pushes the valve body 27 open against the spring 30, and returns a part of this pressure oil from the outlet passage 26 to the tank 42, so that the so-called pressure oil is The controlled pressure oil is applied to the lifting device 21 via the switching valve 41, and the lifting device 21 is driven with a set driving force to operate the seedling planting device 8 as described above. The ground pressure is set.

When the switching valve 41 is in the position shown in the figure, the lifting device 21 is stopped, and when it is switched to the left in the figure, the lifting device 21 is driven to advance regardless of the control command from the control device 23. .

In such a state, the amount of seedlings on the seedling platform 11 in the seedling planting device 8 decreases, and if the weight of the seedling planting device 8 becomes lighter, or the front wheels 2, 2 of the traveling machine body 1 become lighter. If the seedling planting device 8 rides on the convex part of the tiller, or if the depth of the tiller is very shallow, the seedling planting device 8 will float, but in the case of the seedling planting device 8, the ground pressure of the seedling planting device 8 is small, as described above. As the turning force of the seedling planting device 8 increases, the detection rod 31 moves in the compression direction of the spring 34 (to the left in the figure), and the support 29
is adjusted so that the elastic force of the spring 30 is weakened by retracting the spring 30.

As a result, the pressing force acting on the valve body 27 is reduced, the pressure of the pressure oil is controlled to be low, the lifting device 21 is moved backward, the seedling planting device 8 is moved downward, and the seedling planting device 8 is grounded. The pressure is adjusted so that it reaches the set pressure.

In addition, when seedlings are added to the seedling stand 11 of the seedling planting device 8 and the weight of the seedling planting device 8 becomes heavy, or the front wheels 2
, 2 fall into the recess of the tiller, or the depth of the tiller is very deep, the seedling planting device 8 tends to sink, but in this case, the ground pressure of the seedling planting device 8 is large, and the seedling planting device 8 sinks. As the turning force of the seedling planting device 8 becomes smaller, the detection rod 3
1 is moved in the extension direction (to the right in the figure) by the elastic force of the spring 34, and the support body 29 is moved forward to adjust the elastic force of the spring 34 to be increased.

As a result, the pressing force acting on the valve body 27 increases, the pressure of the pressure oil is controlled to be high, and the elevating device 21 is driven to move forward, causing the seedling planting device 8 to move upward.
The ground pressure is adjusted so that it becomes the set pressure.

On the other hand, when the seedling planting device 8 is replaced with a larger one, for example, from a 4-row seedling planting device 8 to a 6-row seedling planting device 8, the weight of the seedling planting device 8 greatly exceeds the elastic force of the spring 34. , the spring 34 remains compressed even when the seedling planting device 8 touches the ground.

Therefore, in such a case, the operating lever 36 should be operated to remove the cam 35.
The receiver 33 is moved forward by rotating clockwise from the illustrated position 35.

This increases the elastic force of the spring 34,
As described above, the control device 23 can control the drive of the lifting device 8.

In addition, when the drive of the lifting device 8 is manually controlled, the operating lever 36 is operated to rotate the cams 35, 35 counterclockwise from the position shown in the figure, and the detection rod 31 is moved backward. .

As a result, the pressing force of the spring 30 on the valve body 27 is eliminated, and the pressure oil from the hydraulic pump 43 flows from the inflow path 25 to the outflow path 26 to the tank 42 without being pressure controlled.
As a result, the supply of the pressure oil to the lifting device 21 is controlled by the switching valve 41.

As explained above, in the rice transplanter according to the present invention, the ground pressure of the seedling transplanting device is detected by the detection section in the control device, and based on this detected value, the control section is operated to control the drive of the lifting device. Since the ground pressure of the seedling planting device is set by the device, the planting depth of seedlings with this seedling planting device is always controlled regardless of changes in the weight of the seedling planting device, unevenness of the tiller, or depth. We were able to make it constant.

Moreover, the present invention has a pair of first
Since the ground pressure of the seedling planting device is detected by using the relative movement of each of these members, the detection unit can be configured using the support link, that is, the detection unit can be configured by using the support link. Of these, the other member that is not provided with the control section can be used also as the detection section, thereby reducing the number of parts and simplifying the structure, as well as reducing the installation space. Since the detection section and the control section are integrated into the support link, ground pressure can be detected and controlled for various seedling planting devices or working machines attached to the tip of the support link, regardless of their shape. Therefore, there is no need to replace the seedling planting section and the control section.

Furthermore, fluctuations in the seedling planting device act directly on the support link, that is, on the detection section, and since the detection section in the control device is directly linked to the control element of the control section, the control section is not required as in the conventional case. There is no need for interlocking members such as wires, electric wires, or hydraulic hoses that interlock the detection part and the seedling planting device, and the structure is simple and costs can be reduced. There is no time lag or decrease in detection sensitivity between detecting the ground pressure and controlling the drive of the lifting device, making it possible to set the ground pressure of the seedling planting device accurately and quickly. It is.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; Fig. 1 is a side view thereof, Fig. 2 is an enlarged vertical sectional view of the main part, Fig. 3 is a partially cutaway plan view of the same, and Fig. 4 is an explanation of the operating state. It is a diagram. 1... Aircraft, 8... Seedling planting device, 21.
...Lifting device, 23...Control device, 23
a...control section, 23b...detection section, 2
7... Valve body (control element).

Claims (1)

[Scope of utility model registration request] In a rice transplanter in which a seedling planting device is connected and supported to the machine body via a support link so as to be movable up and down, and the seedling transplanting device is moved up and down with respect to the machine body by an elevating device, a pair of first and second sets that are movable relative to each other are used. 1 and a second member, and among these members, the first member is connected to the machine body side, and the second member is connected to the seedling planting device side, so that both the members constitute the support link, One of the members is provided with a control unit that controls the drive of the lifting device,
A rice transplanter characterized in that a detection section is formed to detect the ground pressure of the seedling transplanting device by relative movement of each of the members, and the detection section is configured to be operated directly by a control element of the control section. .