JP6355519B2 - Field work machine and angle measuring device for field work machine - Google Patents

Description

  The present invention relates to a field work machine that performs a field plowing work, a field work, etc., such as a reversible plow work machine, and an angle measuring device for the field work machine.

  2. Description of the Related Art Conventionally, a front frame having a mast and a lower link pin for mounting an upper link and a lower link of a tractor, and a reverse frame attached so as to be rotatable with respect to the front frame. And a work machine frame attached to the reverse frame, and the work machine frame is arranged symmetrically in the vertical direction when working (when transported, etc., it is arranged symmetrically when not working) A reversible plow working machine that is provided with a plurality of bottoms, and that works by switching the upper and lower bottoms up and down in accordance with each of the reciprocation of the field when performing reciprocation of the field (Patent Documents 1 to 3). reference).

  By the way, during the rolling operation, the roll angle, which is the rotation angle of the reverse frame with respect to the rotation center axis with respect to the front frame, has a plurality of bottoms arranged vertically symmetrically, and the reverse frame is parallel to the field scene. Based on the condition of, change according to the work situation. The roll angle is changed by tilting the reverse frame with respect to the front frame by a hydraulic cylinder.

  When changing the roll angle of the reverse frame, the roll angle should be adjusted even when the rolling operation is performed with any of the plurality of bottoms arranged to be switched symmetrically up and down. In order to do so, it is necessary to measure the roll angle. Conventionally, angle sensors such as potentiometers and rotary encoders have been used to measure the angle of the left and right bottoms.

JP 2005-318810 A Japanese Patent Application Laid-Open No. 11-196604 JP 2001-112305 A

  When the rolling operation is performed in a state where a plurality of bottoms are arranged vertically symmetrically, the rotation of the reverse frame with respect to the front frame is relatively narrow. However, angle sensors such as potentiometers and rotary encoders conventionally used for measuring the roll angle of the reverse frame with respect to the front frame are for a wide measurement angle and are expensive.

  The present invention aims to solve the above-mentioned problems, and within the range of a relatively narrow roll angle that can adjust the rotation angle of the frame as necessary during the rolling operation. Thus, it is an object of the present invention to realize a field work machine such as a reversible plow work machine including an angle measurement apparatus that can be measured at a low cost and has a simple structure, and an angle measurement apparatus for the field work machine.

  In order to solve the above problems, the present invention provides a front frame, a mast fixed to the front frame, a reverse frame rotatably attached to the front frame by a rotatable main shaft, and a field attached to the reverse frame. In a field work machine provided with first and second bottoms that are vertically symmetrical with each other during work, and an angle measuring device that measures a rotation angle of the reverse frame and the main shaft, the angle measuring device is fixed to the main shaft. A rotation transmission tool and a potentiometer attached to the mast, and when either the first or second bottom is in the lower working posture position, the main shaft is used as a center during field work. The rotation transmitting tool is a potentiometer within a predetermined rotation angle range in which the bottom in the working posture position is inclined with respect to the front frame and rotated. Engage the pivot rod of the motor, provides a field working machine, characterized in that the arrangement to enable measurement of rotation angle.

  In order to solve the above-described problems, the present invention is rotatably attached by a front frame coupled to a tractor via a three-point link, a mast fixed to the front frame, and a main shaft that is rotatable on the front frame. A reverse frame, a first and a second bottom that are attached to the reverse frame and are symmetrical with each other during field work, and an angle measuring device that measures the rotation angle of the reverse frame and the main shaft, Accordingly, the first and second bottom vertical positions are switched by rotating the reverse frame, and the field work machine performs the field work with one of the first and second bottoms in the lower working posture. The angle measuring device includes a rotation transmitting tool that is fixed to the main shaft and rotates together with the main shaft, and a potentiometer attached to the mast. The potentiometer has a rotating rod that is biased so as to be at a certain angular position by a spring, and when one of the first and second bottoms is in the lower working posture position, In a predetermined rotation angle range in which the bottom at the work posture position is tilted and rotated with respect to the front frame during field work, the rotation transmitting tool engages with the rotation rod of the potentiometer, and the potentiometer rotates. The pawl is configured to rotate and measure the rotation angle by the rotation of the rotation transmission tool or by the biasing force of the spring.

  In order to solve the above problems, the present invention provides a front frame, a mast fixed to the front frame, a reverse frame rotatably attached to the front frame by a rotatable main shaft, and a field attached to the reverse frame. An angle measuring device that is attached to a mast of a field work machine that includes first and second bottoms that are vertically symmetrical with each other during work, and that measures the rotation angle of the reverse frame and the main shaft. , A rotation transmitting tool fixed to the main shaft, and a potentiometer attached to the mast, and when one of the first and second bottoms is in the lower working posture position, the main shaft is the center. In a predetermined rotation angle range in which the bottom is tilted and rotated with respect to the front frame during field work, the rotation transmitting tool is a potentiometer. Engage the pivot rod of the over data, which provide an angle measuring device of the field working machine, characterized in that the arrangement to enable measurement of rotation angle.

  The pivot rod of the potentiometer is preferably configured to come into contact with the electrical resistance member within the predetermined rotation angle range in which the potentiometer is rotated by engaging with the rotation transmission tool.

  The rotation transmitting tool includes a rotating body that is fixed to the main shaft and rotates together with the main shaft on the front side of the mast, and a pair of wing portions that are fixed to the rotating body symmetrically about the rotation center. It is preferable that an engagement pin that engages with a rotary rod of the potentiometer protrudes from the tip of each of the pair of wing portions.

  The pivot rod of the potentiometer is always urged by a spring so that the pivot rod is directed vertically and vertically, and the first and second bottoms are horizontally symmetrical with each other and are in a non-working position. Sometimes, it is preferable that the pair of wings of the rotating body are in a neutral state that is horizontal to each other, and is in a state of being separated by an equal angle from the rotating rod that faces in the vertical direction.

  For field work machines such as reversible plow work machines, it is necessary to adjust the roll angle of the reverse frame with respect to the front frame in accordance with the change of the tilling depth and tilling width at the time of plowing work. Although it is necessary to measure the roll angle with respect to the front frame, according to the present invention, the angle measuring device for measuring the roll angle has a relatively narrow roll angle within the range in which the bottom is rotated as necessary. By using a simple configuration suitable for measurement, the price can be reduced.

1 shows the overall configuration of a reversible plow work machine to which the field work machine according to the present invention is applied (however, the angle measuring device in the present invention is not attached), and the first bottom (right bottom) is in the lower working posture. It is a perspective view of a state. FIG. 2 is a perspective view showing the overall configuration of the reversible plow working machine (however, the angle measuring device in the present invention is not attached), with the second bottom (left bottom) in the lower working position. It is a figure explaining the Example of the agricultural field working machine which concerns on this invention, and is a perspective view which shows the part of the front side of an agricultural field working machine. It is the figure which looked at the angle measuring apparatus of the agricultural field working machine of the said Example from the front. It is the perspective view which looked at the angle measuring apparatus of the agricultural field working machine of the said Example from diagonally upward. It is the figure seen from the front explaining the effect | action of the angle measuring device of the field working machine of the said Example, (a) shows a state when a 1st bottom exists in a normal working posture, (b) The state when tilted from the working posture is shown. It is the figure seen from the front explaining the effect | action of the angle measuring apparatus of the agricultural field working machine of the said Example, (a)-(c) is a state which neither a 1st bottom nor a 2nd bottom exists in a working posture. Indicates. It is the figure seen from the front explaining the effect | action of the angle measuring device of the field working machine of the said Example, (a) shows a state when a 2nd bottom exists in a normal working posture, (b) The state when it tilts from the working posture is shown. It is a figure explaining the effect | action when the basic structure of the potentiometer of the field working machine of the said Example and a rotation transmission tool and the 1st bottom are in the state of a working posture. It is a figure explaining the effect | action when the basic structure of the potentiometer of the field working machine of the said Example and the relative structure of a rotation transmission tool, and a 2nd bottom exists in the state of a working posture. It is a figure which shows a response | compatibility with the rotation angle of a rotation transmission tool, and the output voltage obtained with a potentiometer in the agricultural field working machine of the said Example.

  EMBODIMENT OF THE INVENTION The form for implementing the field working machine and angle measuring device which concern on this invention is demonstrated below with reference to drawings based on an Example. In the following description, the traveling direction of the field work machine is referred to as the front, the opposite direction is referred to as the rear, and the left-right direction toward the traveling direction is referred to as the work width direction.

  The field work machine and the angle measuring device according to the present invention can be applied to various field work machines. In this embodiment, referring to FIGS. 1 to 11 according to an example applied to a reversible plow work machine as a field work machine. I will explain.

(Overall configuration of field work machine)
A field work machine (reversible plow work machine) 1 according to the present invention includes a front frame 2 and a reverse frame 3 rotatably attached to the front frame 2 as shown in FIGS. Yes.

  A mast 6 is provided on the front frame 2 so as to stand upward. The front frame 2 and the mast 6 can be connected to the tractor via a three-point link (not shown). Specifically, the front frame 2 can be rotatably connected to the lower link of the tractor on both the left and right sides. The mast 6 can be pivotally connected to the upper link of the tractor at its upper end.

  Although not shown, a lift cylinder is provided between the tractor body and the lower link. By operating the lift cylinder, the front frame 2 and the reverse frame 3, that is, the field work machine 1 are operated via the lower link. The whole can be rotated (tilted) in the vertical direction with respect to the tractor.

  Such rotation is necessary when the field work machine 1 is transported, or when the direction is changed at one end of the field and the vertical positions of the first bottom 18 and the second bottom 19 are switched later in the field work. is there.

  Moreover, the agricultural field work machine 1 can control the height with respect to the agricultural field surface by a lift cylinder, and can control a tilling depth. As described above, the configuration in which the height of the field work machine 1 is controlled by the lift cylinder is not the gist of the present invention, and is a well-known technique (see Patent Documents 1 and 2), and thus will not be described in this specification.

  The reverse frame 3 includes a main frame 7, a support frame 8, and an attachment frame 10. The main frame 7 is a member that extends horizontally in the work width direction when working on the field (the state shown in FIG. 1), and is fixed to the rear portion of the main shaft 14 that is rotatably attached to the front frame 2. It is attached to the frame 2 so as to be rotatable together with the main shaft 14.

  A reverse cylinder 15 is provided between the upper portion of the mast 6 and the main frame 7 (see FIG. 2). By operating the reverse cylinder 15, it is possible to rotate the entire reverse frame 3 together with the main shaft 14 with respect to the front frame 2.

  Although this rotation is described later, when the direction of the forward path and the backward path is changed at one end of the field in the field work, the first bottom 18 and the second bottom 19 that are arranged vertically symmetrically are rotated ( Necessary for switching the upper and lower positions.

  In addition, when either the first bottom 18 or the second bottom 19 located at the lower normal work posture is started to plow the uncultivated land, the roll direction is set with respect to the tractor and the front frame 2. It is also necessary to rotate and tilt to improve the penetration into the soil.

  The support frame 8 is fixed to the rear surface side of the main frame 7 and is provided to extend rearward. The mounting frame 10 is fixed to the rear end of the support frame 8, is substantially horizontal when working on the field, and is disposed so as to be inclined in the work width direction with respect to the work progress direction in plan view. Yes.

  As shown in FIGS. 1 and 2, a first bottom 18 and a second bottom 19 that are arranged symmetrically with each other during field work are attached to the mounting frame 10 via a bottom mounting bracket 9. ing. Each of the first bottom 18 and the second bottom 19 includes a plurality of bottom tools (sandwich tools) 20.

  FIG. 1 shows a state in which the first bottom 18 of the field work machine 1 is in the position of the lower work posture, and the sown soil is discharged to the right side in the work progress direction. The bottom that discharges the soil soaked in this way to the right is usually referred to as the right bottom.

  FIG. 2 shows a state in which the second bottom 19 of the agricultural field work machine 1 is in the position of the lower work posture, and the soiled soil is discharged to the left side in the work progress direction. The bottom that discharges the soil soaked in this way to the left is usually referred to as the left bottom.

  As shown in FIG. 1, a gauge wheel 23 is attached to the rear end portion of the attachment frame 10. The above is the overall configuration of the field work machine 1 according to the present invention. Hereinafter, the angle measuring device that is a feature of the present invention will be described.

(Angle measuring device)
As shown in FIGS. 3 to 8, the angle measuring device 30 includes a rotation transmission tool 31 and a potentiometer 32.

  From the state where the first bottom 18 is positioned in the lower normal working posture, the reverse frame 3 and the main shaft 14 are rotated and the second bottom 19 is positioned in the lower normal working posture. The state of the rotation transmission tool 31 and the potentiometer 32 until is shown in FIGS. 6A and 6B, FIGS. 7A to 7C, and FIGS. 8A and 8B sequentially.

  On the front side of the mast 6, the rotation transmission tool 31 is fixed to the main shaft 14 and rotates with the main shaft 14, and a pair of first fixed to the rotation body 35 symmetrically about the rotation center. The wing part 36 and the second wing part 37 are provided (see FIGS. 4 and 6 to 8).

  FIG. 7B is a view seen from the front of the mast 6 in a neutral state in which neither the first bottom 18 nor the second bottom 19 is in the position of the working posture (non-working posture).

  An engagement pin 41 (see FIG. 5) and an engagement pin 42 project from the front end of each of the first wing portion 36 and the second wing portion 37. As will be described later, the engagement pin 41 of the first wing portion 36 and the engagement pin 42 of the second wing portion 37 are engaged with the rotary rod 43 of the potentiometer 32 from the right side and the left side, respectively (see FIGS. 6 and 6). (See FIG. 8).

  As shown in FIG. 4, the potentiometer 32 is attached to the front surface of the mast 6 above the rotation transmission tool 31. The potentiometer 32 has a rotation rod 43, and the rotation rod 43 extends in the vertical direction from the center of the potentiometer 32 (see FIGS. 5 and 6-8). The pivot rod 43 is pivotable together with a pivot shaft 56 provided at the center of a circular substrate 55 described later on the potentiometer 32 (see FIGS. 9 and 10).

  Rotating so that the lower end portion 44 of the rotating rod 43 protruding downward from the potentiometer 32 can be engaged with the engaging pin 41 and the engaging pin 42 of the first wing portion 36 and the second wing portion 37. The transmission tool 31 and the potentiometer 32 are mutually arranged.

  When the rotation transmitting tool 31 rotates, the engagement pin 41 of the first wing portion 36 and the engagement pin 42 of the second wing portion 37 are engaged with the lower end portion 44 of the rotation rod 43, respectively. The rotation rod 43 rotates together with the rotation transmission tool 31.

  Specifically, FIGS. 6 and 8 are views as seen from the front of the mast 6, but in a state where the rotation transmitting tool 31 is rotated counterclockwise, the engagement of the first wing portion 36 is illustrated. The coupling pin 41 engages with the right side surface of the lower end portion 44 of the rotating rod 43 to rotate the rotating rod 43 clockwise (see FIG. 6A).

  On the contrary, in a state where the rotation transmitting tool 31 is rotated in the clockwise direction, the engagement pin 42 of the second wing portion 37 is engaged with the left side surface of the lower end portion 44 of the rotation rod 43 to rotate the rotation rod. 43 is rotated counterclockwise (see FIG. 8A).

  An upper end 45 of the rotary rod 43 protruding downward from the potentiometer 32 is attached to the lower end of the tension coil spring 49 (see FIGS. 5 and 6 to 8). The upper end of the tension coil spring 49 is attached to the mast 6. The rotary rod 43 of the potentiometer 32 is always urged by the tension coil spring 49 so as to take a vertical and vertical posture as shown in FIG.

  When the field work machine 1 does not perform the digging operation and the first bottom 18 and the second bottom 19 are in a horizontal state and are symmetrical with respect to each other and in a non-working position, the state is shown in FIG. As described above, the first wing portion 36 and the second wing portion 37 of the rotating body 35 are in a neutral state in which they are horizontal to each other and are spaced apart from each other by an equal angle from the rotating rod 43 that is directed in the vertical direction.

  A basic configuration of the potentiometer 32 and a relative configuration of the rotation transmission tool 31 are shown in FIGS. 9 and 10. As shown in FIGS. 9 and 10, the potentiometer 32 includes a circular substrate 55, and the rotation rod 43 is attached to a rotation shaft 56 that is rotatably provided at the center of the circular substrate 55. Yes. A slider 57 that rotates together is attached to the rotating rod 43.

A resistance plate 61 is continuously formed on the circular substrate 55 within a part of an angular range around the rotation axis 56. This partial angle is the sum of the angles α ₁ and α ₂ of the same size on the left and right of the center line O of the circular substrate 55. Of resistance plate 61, and the angle alpha ₁ of the partial resistance portion 61L, an angle alpha ₂ of the partial resistor portion 61R.

The rotation angle α ₁ of the rotation rod 43 corresponds to the tilling depth and the tilling width when the rotation transmitting tool 31 and the first wing portion 36 work on the first bottom 18. corresponding to the rotation a predetermined angle theta ₁ required (see Figure 11). The rotation angle α ₂ of the rotation rod 43 is rotated according to the tilling depth and the tilling width when the rotation transmitting tool 31 and the second wing portion 37 work on the second bottom 19. This corresponds to the required predetermined angle θ ₂ (see FIG. 11).

One end 62 of the resistive plate 61 is grounded is connected to a ground portion 64 (connected to GND), the other end portion 63 is the reference voltage V _in is applied. Thus, in a state where one end portion 62 of the resistance plate 61 reference voltage V _in between the ground portion 64 is applied. The slider 57 is connected to the output end 66.

The slider 57 rotates with the rotation of the rotating rod 43 and slides in contact with the resistance plate 61. From the applied reference voltage V _in, a voltage drop occurs depending on the length of the resistive plate 61 from the other end portion 63 to contact with and position of the slider 57.

For this reason, the output voltage _Vout of the output end 66 varies according to the contact position of the slider 57 with the resistance plate 61. The output voltage _Vout at the output terminal 66 is configured to be measured with a voltmeter (not shown).

The output voltage _Vout that fluctuates at the rotational position of the slider 57 is measured in advance with respect to the rotational angle θ of the rotational transmission tool 31 engaged with the rotational rod 43, as shown in the diagram of FIG. In addition, data in which the output voltage _Vout and the rotation angle θ of the rotation transmission tool are associated in advance is created, and the data is stored in a storage unit such as a microcomputer.

When the reverse frame and the rotation transmission tool 31 are tilted during actual farm work, the rotation rod 43 rotates, but the output voltage _Vout corresponding to the rotation position of the slider 57 is measured with a voltmeter. By measuring and inputting to a microcomputer or the like and obtaining the rotation angle of the corresponding rotation transmission tool 31 with this output voltage _Vout , the rotation transmission tool 31, the reverse frame 3, and the first bottom 18 in the working posture or It becomes possible to measure the inclination angle of the second bottom 19 within the angle range of the predetermined angle θ1 or θ2.
(Function)

  In the field work, the field work machine 1 is attached to the tractor, the field work machine 1 is pulled by the tractor, and the bottom of either the first bottom 18 or the second bottom 19 is used as a normal work on the lower side. By positioning it in the posture, it is possible to perform the swallowing work on the field surface.

  In the agricultural field, the work is performed in a reciprocating manner in the longitudinal direction of the agricultural field. For example, when the first bottom 18 is positioned in the normal working posture on the lower side and the forward operation is performed and the work moves to one end side of the agricultural field, the return path is performed. When the direction is changed, the lift cylinder is operated to rotate the lower link, the front frame 2 and the reverse frame 3 upward about the connecting portion on the tractor side of the lower link.

  Subsequently, the reverse cylinder 15 is operated to rotate the reverse frame 3 around the main shaft 14 with respect to the front frame 2 (upside down), so that the positions of the first bottom 18 and the second bottom 19 are turned upside down. To do.

  Then, after the tractor and the field work machine 1 change the direction from the forward path to the return path, the lift cylinder is operated, and the lower link, the front frame 2 and the reverse frame 3 are rotated downward to operate the field work machine 1. It returns to the posture to perform, and the field work of a return way is performed by the 2nd bottom 19 located in the lower normal working posture. The above is the overall operation of the field work machine 1 in the field work. Next, the operation of the angle measuring device 30 will be described.

  When the field work machine 1 does not perform the digging work and the first bottom 18 and the second bottom 19 are in a horizontal state and are symmetrical with each other in the non-working position, as described above, FIG. b) As shown in the neutral state, the first wing portion 36 and the second wing portion 37 of the rotating body 35 are in a horizontal state with respect to each other and spaced apart from the rotating rod 43 directed in the vertical direction by an equal angle. It becomes a state.

  In this state, even if the reverse cylinder 15 is operated to rotate the reverse frame 3, the main shaft 14, and the rotating body 35, the engagement pin 41 of the first wing portion 36 and the engagement pin of the second wing portion 37. As shown in FIGS. 7 (a) to 7 (c), the rotation rod 43 of the potentiometer 32 is located within an angle range that does not engage with the lower end portion 44 of the rotation rod 43 oriented in the vertical direction. Does not rotate, there is no voltage variation measured by the angle measuring device 30, and no change in the rotation angle is measured.

  The reverse cylinder 15 is operated to rotate the reverse frame 3, the main shaft 14, and the rotation transmission tool 31, and either the first bottom 18 or the second bottom 19, for example, as shown in FIG. Field work can be performed by placing the bottom 18 in the normal working posture on the lower side.

  By the way, at the time of farm work, the tractor travels on the bottom of the groove formed when plowing the right wheel while working on the first bottom 18 and the left wheel while working on the second bottom 19. For this reason, the work is inclined to the left or right with respect to the farm scene. However, if the reverse frame 3 and the front frame 2 are integrated, the reverse frame is also tilted together with the tractor, and the farm is cultivated flat. I can't wake up.

  Therefore, the tractor and the front frame 2 are maintained in an inclined state, and the reverse cylinder 15 is operated with respect to the front frame 2 to rotate the reverse frame 3 together with the main shaft 14 in the roll direction so that the tractor and the front frame 2 are parallel to the field scene. The roll angle of the reverse frame 3 with respect to the front frame 2 is changed according to the depth of tillage, the wheel distance of the tractor rear wheel, and the like.

  As described above, in the field work, when the reverse cylinder 15 is operated and the reverse frame 3 is rotated in the roll direction together with the main shaft 14 and tilted, it is necessary to know the roll angle (tilt angle). Such measurement of the roll angle is performed by the angle measuring device 30 and the operation thereof is as follows.

  In a state in which the first bottom 18 is positioned in the normal working posture on the lower side and the fielding operation is performed (see FIG. 1), the rotating body 35 in FIG. From the neutral state shown, it is in a state of being rotated counterclockwise as viewed from the front side, and as shown in FIG. 6 (a), the engagement pin 41 of the first wing portion 36 is on the right side surface of the rotary rod 43. And the pivot rod 43 is pivoted clockwise.

In this state, the rotation transmission tool 31 is at the angular position θ ₁₁ (see FIG. 11), and in the potentiometer 32, as shown in FIG. 9, the rotation rod 43 and the slider 57 are from the center of the one resistance portion 61L. The angle is slightly close to the one end 62. In this state, the voltage drop from the applied reference voltage _{V in} by the resistance plate 61, the output voltage _{V out} of _the output end 66 as measured by voltmeter is _{V 11} (see FIG. 11).

  As described above, when working on the field, the tractor is tilted with respect to the field scene during the operation in order to run the bottom of the groove formed when the right wheel is already cultivated while working on the first bottom 18. The reverse frame 3 is brought into a normal working posture position inclined relative to the tractor and the front frame 2 by the reverse cylinder 15 in order to cultivate the field flat.

  Then, when the first bottom 18 is working, the right wheel from the position of the normal working posture, for example, travels on the bottom of the deeply cultivated groove, and the field is flattened. In order to plow, it is necessary to newly tilt the reverse frame 3 with respect to the tractor and the front frame 2.

  Specifically, in the above case, when the first bottom 18 rotates counterclockwise as viewed in the working direction in order to cultivate the field flat, the first wing portion 36 is moved from the front side. As seen from FIG. 6 (a) to FIG. 6 (b), it rotates clockwise. Then, due to the urging force of the tension coil spring 49, the rotating rod 43 rotates counterclockwise while engaging with and following the engaging pin 41 of the first wing portion 36.

That is, in the potentiometer 32, rotation bar 43 and the slider 57 is in the range from the position shown in FIG. 9 the angle alpha ₁ of (within a predetermined rotational angle theta ₁ of the rotation transmitting device 31), anti Rotate clockwise. As a result, the rotation transmitting member 31 when rotated until the angular position theta _12, the voltage drop due to the resistance plate 61 is decreased, the increased output voltage _{V out,} the _{V 12} (see FIG. 11).

By measuring the output voltage _Vout and inputting it to the microcomputer in this way, the rotation is based on the data on the correspondence between the output voltage _Vout and the rotation angle θ of the rotation transmission tool 31 stored in advance in the microcomputer. angular position theta ₁₂ dynamic transmission device 31 is obtained, thereby, the normal reverse frame 3 from the position of Ergonomics and the pivoting angle is tilted first bottom 18 of the first bottom 18 (inclination angle) It becomes possible to measure.

  When the direction is changed from the forward operation of the farm field to the return operation, the first bottom 18 is switched up and down so that the second bottom 19 is positioned on the lower side. At the time of this switching, the reverse frame 3, the main shaft 14, and the rotating body 35 rotate (invert).

In this rotation process, as shown in FIGS. 7A to 7C, both the engagement pin 41 and the engagement pin 42 of the first wing portion 36 and the second wing portion 37 are rotated. 43 is not engaged, the pivot rod 43 of the potentiometer 32 does not pivot, so the output voltage _Vout does not change.

  In the work on the return path of the field after the up / down switching, as shown in FIG. 2, in the state where the second bottom 19 is positioned in the normal working posture on the lower side and the fielding operation is performed, the rotating body 35 is From the neutral state shown in FIG. 7 (b), it is in a state of rotating clockwise as viewed from the front side, and the engaging pin 42 of the second wing portion 37 engages with the left side surface of the rotating rod 43, The rotating rod 43 is in a state of rotating counterclockwise.

In this state, the rotation transmission tool 31 is at the angular position θ ₂₁ (see FIG. 11), and in the potentiometer 32, as shown in FIG. 10, the rotation rod 43 and the slider 57 are slightly from the center of the resistance portion 61R. It is at an angular position close to the other end 63. In this state, the voltage drop from the reference voltage _{V in} applied by the resistance plate 61, the output voltage _{V out} of _the output end 66 as measured by voltmeter is _{V 21} (see FIG. 11).

  As described above, when working on the field, the tractor is tilted with respect to the field scene during the operation in order to run the bottom of the groove formed when the left wheel is already cultivated while working on the second bottom 19. The reverse frame 3 is brought into a normal working posture position inclined relative to the tractor and the front frame 2 by the reverse cylinder 15 in order to cultivate the field flat.

  When the second bottom 19 is working, the left wheel, for example, runs on the bottom of a deeply cultivated groove from the position of the normal working posture. In order to plow, it is necessary to newly tilt the reverse frame 3 with respect to the tractor and the front frame 2.

  Specifically, in the above case, when the second bottom 19 is inclined in the clockwise direction when viewed in the working direction in order to plow the field flat, the second wing portion 37 is viewed from the front side, As shown in FIG. 8B to FIG. 8A, it rotates counterclockwise. Then, due to the urging force of the tension coil spring 49, the rotating rod 43 rotates clockwise while engaging with and following the engaging pin 42 of the second wing portion 37.

That is, in the potentiometer 32, the pivot rod 43 and the slider 57 are within the range of the angle α ₂ (within the range of the predetermined pivot angle θ ₂ of the pivot transmission tool 31) from the position shown in FIG. Rotate in the direction. As a result, the rotation transmitting member 31 is rotated until the angular position theta _22, the voltage drop due to the resistance plate 61 is increased, the output voltage _{V out} becomes lowered _{V 22} (see FIG. 11).

By measuring this output voltage _Vout and inputting it to the microcomputer, the rotation transmission tool is based on the data on the correspondence between the output voltage _Vout and the rotation angle θ of the rotation transmission tool 31 stored in advance in the microcomputer. The rotation angle θ _{22 of} 31 is obtained, and thereby the rotation angle (tilt angle) of tilting the reverse frame 3 and the second bottom 19 from the position of the normal working posture of the second bottom 19 is measured. Is possible.

  As mentioned above, although the form for implementing the field work machine and angle measuring device concerning the present invention was explained based on the example, the present invention is not limited to such an example, and it is in a claim. It goes without saying that there are various embodiments within the technical scope described.

  Since the field work machine concerning the present invention is the above composition, it is applicable not only to a reversible plow provided with a bottom plow up and down but also to various field work machines.

1 Field work machine
2 Front frame
3 Reverse frame
6 Mast
7 Main frame
8 Support frame
9 Bracket for bottom mounting
10 Mounting frame
14 Spindle
15 Reverse cylinder
18 First bottom
19 Second bottom
20 Bottom tool
23 gauge wheel
30 Angle measuring device
31 Rotating transmission tool
32 Potentiometer
35 Rotating body
36 First wing part of rotating body
37 Second wing of rotating body
41 Engagement pin of first wing part
42 Engaging pin of second wing
43 Rotation of potentiometer
44 Lower end of rotating rod
45 Upper end of rotating rod
49 tension coil spring 55 circular substrate of potentiometer 56 rotary shaft of potentiometer 57 slider of potentiometer 61 resistance plate of potentiometer 62 one end of resistance plate 63 other end of resistance plate 64 grounding portion 66 output end of potentiometer

Claims (9)

A front frame, a mast fixed to the front frame, a reverse frame pivotally attached to the front frame by a pivotable main shaft, and first and first symmetrically attached to the reverse frame and vertically symmetrical with each other during field work; In a field work machine provided with 2 bottoms, an angle measuring device which measures a rotation angle of a reverse frame and a main axis,
The angle measuring device includes a rotation transmission tool fixed to the main shaft, and a potentiometer attached to the mast.
When either one of the first and second bottoms is in the lower work posture position, a predetermined rotation is performed by tilting and rotating the bottom in the work posture position with respect to the front frame around the main shaft during field work. Within the rotation angle range, the rotation transmission tool is configured to engage with the rotation rod of the potentiometer and to measure the rotation angle. A front frame connected to the tractor via a three-point link, a mast fixed to the front frame, a reverse frame rotatably attached to the front frame by a rotatable main shaft, and a field attached to the reverse frame The first and second bottoms which are vertically symmetrical with each other at the time of operation, and an angle measuring device for measuring the rotation angle of the reverse frame and the main shaft, and rotating the reverse frame according to the reciprocating operation of the field. In the field work machine which switches the 1st and 2nd bottom up-and-down position, and makes any one of the 1st and 2nd bottom work posture and performs field work,
The angle measuring device includes a rotation transmission tool that is fixed to the main shaft and rotates together with the main shaft, and a potentiometer attached to the mast.
The potentiometer has a rotating rod that is biased so as to be at a certain angle position by a spring, and when either the first or second bottom is in the lower working posture position, the field work is performed around the main shaft. The rotation transmitting tool engages with the rotation rod of the potentiometer within a predetermined rotation angle range in which the bottom in the working posture position is inclined and rotated with respect to the front frame. Is a structure that is rotated by the rotation of the rotation transmission tool or by the biasing force of the spring, and is capable of measuring the rotation angle.   3. The potentiometer has a configuration in which the pivot rod contacts the electrical resistance member within the predetermined pivot angle range in which the pivot rod engages and rotates with the pivot transmission tool. The field work machine described.   The rotation transmitting tool includes a rotating body that is fixed to the main shaft and rotates together with the main shaft on the front side of the mast, and a pair of wing portions that are fixed to the rotating body symmetrically about the rotation center. The farm work machine according to claim 1, wherein an engagement pin that engages with a rotary rod of a potentiometer is provided at the tip of each of the pair of wing parts.   The pivot rod of the potentiometer is always urged by a spring so that the pivot rod is directed vertically and vertically, and the first and second bottoms are horizontally symmetrical with each other and are in a non-working position. The pair of wing portions of the rotating body are sometimes in a neutral state that is mutually horizontal, and are in a state of being equiangularly separated from a rotating rod oriented in the vertical direction. The field work machine described. A front frame, a mast fixed to the front frame, a reverse frame pivotally attached to the front frame by a pivotable main shaft, and first and first symmetrically attached to the reverse frame and vertically symmetrical with each other during field work; An angle measuring device that is attached to a mast of a field work machine having two bottoms, and that measures a rotation angle of a reverse frame and a main shaft,
The angle measuring device includes a rotation transmission tool fixed to the main shaft, and a potentiometer attached to the mast.
When either the first or second bottom is in the lower working posture position, within a predetermined rotation angle range in which the bottom is tilted and rotated with respect to the front frame around the main shaft during field work. The rotation measuring device according to claim 1, wherein the rotation transmitting tool is configured to engage with a rotation rod of the potentiometer and to measure a rotation angle.   7. The potentiometer has a configuration in which a pivot rod is in contact with an electrical resistance member within the predetermined pivot angle range that pivots by engaging with a pivot transmission tool. Angle measuring device for farm work machines.   The rotation transmitting tool includes a rotating body that is fixed to the main shaft and rotates together with the main shaft on the front side of the mast, and a pair of wing portions that are fixed to the rotating body symmetrically about the rotation center. The angle measuring device for a farm work machine according to claim 6 or 7, wherein an engaging pin that engages with a rotary rod of a potentiometer is projected at the tip of each of the pair of wing parts. .   The pivot rod of the potentiometer is always urged by a spring so that the pivot rod is directed vertically and vertically, and the first and second bottoms are horizontally symmetrical with each other and are in a non-working position. The pair of wings of the rotating body are sometimes in a neutral state that is horizontal to each other, and are in a state of being separated by an equal angle from a rotating rod directed in the up-down direction. An angle measuring device for a field work machine as described.

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