JP5553382B2 - Plowing depth information acquisition device and tractor - Google Patents

Description

  The present invention relates to a tilling depth information acquisition device and a tractor.

  In paddy fields, the depth of the cultivator, that is, the thickness of the soil layer, greatly affects the growth of crops. That is, if the thickness of the soil layer can be made uniform by plowing at a fixed plowing depth, the uneven growth of the crop can be reduced. Thus, in order to keep the tilling depth constant, a technique for controlling the tillage working machine to a constant height (constant posture) with respect to the surface (ground) of the field is necessary.

  Recently, as a technology to control the height of the tillage implement from the ground, the movement of the rear cover provided behind the tillage implement is detected, and the height of the tillage implement is adjusted according to the swing angle of the rear cover. Something that moves up and down has appeared (for example, see Patent Documents 1 to 4). In addition, there is a grounding wheel attached in front of or behind the tillage work machine that regulates the descent of the tillage work machine and keeps the height from the ground constant (see, for example, Patent Document 5).

JP 2008-211971 A JP 2005-198522 A JP 2000-184805 A JP-A-11-225505 JP 2001-136810 A

  However, in the above-described technology for detecting the movement of the rear cover, the surface height after tillage is detected. Therefore, it is affected by the size of the clod formed during tillage, which changes depending on soil properties and soil moisture condition. May not be able to perform proper control. Moreover, since the surface height is detected at the timing after tilling, there is a possibility that the height control of the tilling work machine may be delayed.

  In addition, in the technology using the above-described grounding ring, since the degree of settlement of the grounding ring is different between the case where the soil moisture on the field surface is high and soft and the case where the soil moisture is low and hard, descent regulation cannot be performed accurately. There is a fear.

  Furthermore, since any of the above methods does not take into account the change in the attitude angle of the tillage work machine, there is a possibility that measurement errors, control errors, etc. may occur due to this.

  Then, this invention is made | formed in view of said subject, and it aims at providing the tilling depth information acquisition apparatus which can acquire the information regarding the tilling depth of a tilling work machine accurately. Another object of the present invention is to provide a tractor capable of plowing at an appropriate plowing depth.

The tillage depth information acquisition device according to the present invention includes a rotation amount detection unit including a rotation shaft and a detection unit that is connected to the rotation shaft and detects information about the rotation amount of the rotation shaft, and a traveling direction of the tillage work machine A first gear provided forward and fixed to the rotating shaft, and a second gear having a different number of teeth from the first gear and rotating in accordance with a change in the vertical height position from the ground And a transmission member that transmits the rotation of the second gear to the first gear, and a position change transmission unit that rotates the rotating shaft in response to a change in a vertical height position from the ground. The position maintaining unit that holds the detecting unit and maintains the posture of the detecting unit with respect to the vertical direction regardless of the posture change of the tilling work machine with respect to the ground, and using the detection result of the detecting unit, the tilling Plowing depth information to obtain information on the working machine plowing depth And resulting unit is tilling depth information acquisition apparatus comprising a.

  According to this, the information on the rotation amount of the rotation shaft detected by the tilling depth information acquisition unit includes not only the rotation amount by the position change transmission unit, that is, the change in the vertical height position from the ground, but also the posture. Since the maintenance unit changes the attitude of the detection unit, i.e., the amount of inclination of the tillage working machine with respect to the ground is included, even when the tilling work machine is tilted, It becomes possible to acquire information on the tilling depth with high accuracy.

In this case, the position change transmission unit may include a contact unit that contacts the ground, and the second gear may rotate according to a change in the position of the contact unit in the vertical direction. . The posture maintaining unit may include a pendulum member that holds the detection unit and is swingable with respect to the rotation shaft. In such a case, even if the tiller is tilted, the posture of the pendulum member does not change (the posture with respect to the vertical direction). Therefore, by holding the detection unit on the pendulum member, the posture of the detection unit can be achieved with a simple configuration. Maintenance can be realized.

  In this case, the pendulum member may be provided with a mark indicating whether or not the tilling work machine is in a horizontal state. In such a case, it can be determined based on the mark whether or not the tilling work machine is in a horizontal state.

  A tractor according to the present invention is a tractor including a tractor body, a tilling work machine connected to the tractor body, and a tilling depth information obtaining apparatus according to the invention that obtains information related to a tilling depth of the tilling work machine. .

  According to this, since the cultivation depth information acquisition device which can acquire the information about the cultivation depth with high accuracy is provided, by operating the cultivation work machine using the cultivation depth, the appropriate cultivation depth can be obtained. It becomes possible to plow.

  In this case, the apparatus further includes an adjusting device that adjusts the vertical position of the tilling work machine so that the information about the tilling depth acquired by the tilling depth information acquiring device indicates a preset value. Can be. In such a case, since the vertical position of the tillage working machine is adjusted by the adjusting device, it is possible to automatically perform tilling at an appropriate tilling depth.

  The plowing depth information acquisition apparatus of the present invention has an effect that information on the plowing depth of the plow working machine can be acquired with high accuracy. Moreover, the tractor of this invention has the effect that it can cultivate with an appropriate tilling depth.

It is a side view of the tractor concerning one embodiment. It is a figure which expands and shows a cultivation depth information acquisition apparatus. 3A is a view showing a state in which the acquisition device main body, the pendulum member and the swing rake are taken out from FIG. 2, and FIG. 3B is a view showing the internal structure of FIG. 3B. . FIG. 4A is a diagram showing the internal structure of the housing of the acquisition apparatus body, and FIG. 4B is a cross-sectional view taken along line AA in FIG. It is a figure which shows the state by which the attitude | position of a potentiometer is maintained even if the acquisition apparatus main body inclines. It is a block diagram which shows the principal part of the control system of one Embodiment. It is a figure which shows the state which a rotary working machine is not inclined. FIG. 8A and FIG. 8B are views showing a state where the rotary working machine is tilted backward. Fig.9 (a) and FIG.9 (b) are figures which show the state which the rotary working machine inclines forward. FIG. 10A is a diagram showing an example in the case where the number of teeth of the sprocket is varied (at the time of backward tilting), and FIG. 10B is an example in which the number of teeth of the sprocket is varied (forward tilted). FIG. It is a figure which shows the example which provided the mark in the pendulum member. It is a figure which shows the cultivation depth information acquisition apparatus at the time of using a ground ring.

  Hereinafter, an embodiment of a tractor and a tilling depth information acquisition device according to the present invention will be described in detail with reference to FIGS. FIG. 1 is a side view of a tractor 100 according to the present embodiment.

  The tractor 100 is an apparatus that forms a soil layer by performing tilling while moving in a farm field (for example, paddy field). As shown in FIG. 1, the tractor 100 is provided at a tractor body 10 that moves in the field, a rotary work machine 50 as a tilling work machine that is mounted behind the tractor body 10, and a front end of the rotary work machine 50. The plowing depth information acquisition device 70 is provided.

  The tractor body 10 uses, for example, an engine as power, and transmits the power to the rotary work machine 50 side (PIC shaft) via the PTO shaft 12 and the yoke joint 14. A connection mechanism 20 for mounting the rotary work machine 50 to the tractor body 10 is provided at the rear part of the tractor body 10.

  The connection mechanism 20 is substantially equidistant from the two lower links 22a and 22b above and below the two lower links 22a and 22b on the left and right sides (the front side and the rear side in FIG. 1). And a top link 24 provided at the position. One end (lower end) of the lift rod 32a is connected to one lower link 22a (on the front side in FIG. 1). The other end (upper end) of the lift rod 32a is connected to the lift arm 30a. The lift arm 30a receives the driving force of the hydraulic cylinder 28 (the driving force in the direction of the broken arrow in FIG. 1) and rotates about the shaft 31. In addition, one end (lower end) of the lift rod 32b is connected to the other lower link 22b (on the back side in FIG. 1). The other end (upper end) of the lift rod 32b is connected to a lift arm 30b that can rotate about the shaft 31. The hydraulic cylinder 28 may apply the same driving force to the lift arm 30b as the lift arm 30a. The rotary working machine 50 is lifted upward by driving the hydraulic cylinder 28 so that the lift arm 30a shown in FIG. 1 rotates counterclockwise about the shaft 31. On the contrary, the rotary working machine 50 is lowered downward by driving the hydraulic cylinder 28 so that the lift arm 30a rotates clockwise around the shaft 31.

  The rotary working machine 50 receives the power supplied from the tractor body 10 via the PTO shaft 12 and the yoke joint 14 by the PIC shaft, rotates the rotating claw 52, and performs the cultivation of the farm field. A rear cover 51 is provided behind the rotary working machine 50.

  The plowing depth information acquisition device 70 is attached to the rotary working machine 50 so as to be positioned in front of the rotating claw 52 in the traveling direction. FIG. 2 is an enlarged view of the tilling depth information acquisition device 70 taken out. This plowing depth information acquisition device 70 includes a protective cover 62, an acquisition device main body 64 held by the protective cover 62, a pendulum member 72 as a posture maintaining unit provided in the acquisition device main body 64, and a potentiometer 74 as a detection unit. And a swing rake 66 and a small rake 68 fixed to the protective cover 62.

  The protective cover 62 includes a fixing portion 62a for fixing (screwing) to the rotary working machine 50, and a protection portion 62b that holds the acquisition device main body 64 and protects the acquisition device main body 64 from earth and sand. . A plurality of screw holes are formed in the fixed portion 62a in the vertical direction. Therefore, it is possible to change the height position of the plowing depth information acquisition device 70 (the height position of the rotary claw 52 with respect to the lower end portion of the rotation trajectory) by appropriately changing the screw hole used for screwing. .

  3A shows a state in which the acquisition device main body 64, the pendulum member 72, the potentiometer 74, and the swing rake 66 are taken out from FIG. 2, and FIG. 3B shows the inside of FIG. The structure is shown schematically. 4A shows the internal structure of the housing 75 of the acquisition apparatus main body 64, and FIG. 4B shows a cross-sectional view taken along line AA of FIG. 3A. . In FIG. 4B, illustration of a part of the configuration is omitted in order to avoid complication of the drawing.

  As shown in FIG. 3A, the acquisition device main body 64 includes a casing 75 having a substantially rectangular parallelepiped shape, and two rotation shafts 76 a and 76 b provided on the casing 75. A swing rake 66 is fixed to one of the rotary shafts 76a and 76b. Further, as shown in FIG. 4B, the pendulum member 72 is engaged with the other rotating shaft 76a. The rotating shaft 76 a is connected to a potentiometer 74, and the potentiometer 74 is fixed to the pendulum member 72 with a bolt 73.

  Moreover, as shown to Fig.4 (a), sprocket 78a, 78b which has the same number of teeth (for example, 26) is provided in each rotating shaft 76a, 76b. A roller chain 80 is engaged with each of the sprockets 78a and 78b. One end of the compression coil spring 82 a is connected to one end of the roller chain 80. The other end of the compression coil spring 82 a is in a state of being caught by a fixed shaft 84 a implanted in the housing 75. On the other hand, one end of a compression coil spring 82 b is connected to the other end of the roller chain 80. The other end of this compression coil spring 82b is in a state of being caught by a fixed shaft 84b planted in the casing 75.

Returning to FIG. 3B, the rocking rake 66 has a substantially rectangular parallelepiped body portion 66a and a rake portion 66b. The main body 66a is fixed to the rotation shaft 76b of the acquisition device main body 64, and is always urged counterclockwise by an elastic member (not shown). For this reason, the rake part 66b is always in contact with the field surface (ground), and the contact angle α of the rake part 66b with respect to the ground changes according to the relative positional relationship with the ground. ing. As described above, when the contact angle α of the swing rake 66 changes, the rotation shaft 76b rotates. In this case, for example, the rotary shaft 76b is rotated in the direction of arrow F ₁ in FIG. 4 (a), the roller chain 80 is moved in the F ₂ direction, along with this, the rotation shaft 76a is rotated in the arrow F ₃ direction It becomes like this. Similarly, the rotary shaft 76b is, when the arrow F ₁ in FIGS. 4 (a) is rotated in the reverse direction, the rotary shaft 76a is to be rotated in the direction opposite to the arrow F ₃ direction. That is, it can be said that the change in the position in the vertical direction of the portion of the rocking rake 66 that contacts the ground is converted into the amount of rotation of the rotary shaft 76a by the sprockets 78a and 78b and the roller chain 80. In this case, the potentiometer 74 outputs a voltage corresponding to the amount of rotation of the rotating shaft 76a to the control device 90 (see FIG. 6). In addition, the rotation amount detection part is implement | achieved including the potentiometer 74 and the rotating shaft 76a. Further, a conversion unit is realized by the sprockets 78 a and 78 b and the roller chain 80, and a position change transmission unit is realized by the conversion unit and the swing rake 66.

  The pendulum member 72 is suspended and supported by the casing 75, and its longitudinal direction is always directed to the vertical direction. Since the potentiometer 74 is fixed to the pendulum member 72 as described above, the posture of the potentiometer 74 (the posture in the vertical direction) is always maintained constant by the pendulum member 72. That is, for example, even when the rotary work machine 50 is tilted and the acquisition apparatus main body 64 is tilted as shown in FIG. 5, the posture of the potentiometer 74 is maintained. In this case, the potentiometer 74 outputs to the control device 90 a voltage as if the rotary shaft 76a has rotated in the direction of arrow G by the amount of inclination of the rotary work machine 50.

  Returning to FIG. 2, the small rake 68 is used to eliminate a lump or the like ahead of the swinging rake 66 in the traveling direction so that the lump or the like existing on the ground does not hit the swinging rake 66.

  FIG. 6 is a block diagram showing the main parts of the control system of this embodiment. As shown in FIG. 6, in this embodiment, the control device 90 as the tilling depth information acquisition unit acquires the voltage value output from the potentiometer 74 and drives the hydraulic cylinder 28 based on the voltage value. . In response to the driving of the hydraulic cylinder 28, the lift arm 30a shown in FIG. 1 rotates about the shaft 31, and the rotary working machine 50 moves in the vertical direction. In the present embodiment, an adjustment device that adjusts the vertical position of the rotary working machine 50 is realized by the control device 90, a hydraulic cylinder, and the like.

  Next, a specific method for adjusting the height of the rotary working machine 50 by the control device 90 will be described in detail with reference to FIGS. 7 to 9, the illustration of the rear cover 51 is omitted.

  FIG. 7 shows a state where the rotary working machine 50 is not inclined (a state where the PIC axis is horizontal). In this state, for example, it is assumed that the inclination angle of the rocking rake 66 from the vertical direction is 113 °. In addition, it is assumed that the tilling depth (plowing depth) at this time is 120 mm. In this case, the potentiometer 74 outputs a voltage corresponding to an inclination angle of 113 °. In the present embodiment, the control device 90 adjusts the height of the rotary working machine 50 so as to maintain the tilling depth at 120 mm.

  From this state, it is assumed that the rotary working machine 50 tilts backward by 3 ° as shown in FIG. In this case, it is assumed that the pendulum member 72 shown in FIG. In such a case, the attitude of the potentiometer 74 varies with the inclination of the rotary working machine 50. In this case, if the control device 90 controls the hydraulic cylinder 28 so that the output voltage of the potentiometer 74 is a voltage indicating the inclination angle 113 ° of the swing rake 66, the tilling depth is as shown in FIG. As shown in a), it becomes 134.24 mm. That is, when the rotary working machine 50 is tilted, the potentiometer 74 is also tilted by the same amount as the tilt amount. Therefore, even if the hydraulic cylinder 28 is controlled so that the voltage of the potentiometer 74 becomes a constant value, the case of FIG. Will have a different working depth.

  On the other hand, when the potentiometer 74 is fixed to the pendulum member 72 provided in the tilling depth information acquisition device 70 as in the present embodiment, even if the rotary working machine 50 tilts backward, the pendulum member 72 acts. The potentiometer 74 maintains a constant posture. In this case, the output voltage of the potentiometer 74 indicates a value obtained by rotating (returning) the rotary shaft 76a by the amount of inclination of the rotary working machine 50. Therefore, if the control device 90 controls the hydraulic cylinder 28 and adjusts the height of the rotary working machine 50 so that the output voltage of the potentiometer 74 becomes a voltage corresponding to the inclination angle 113 °, FIG. ), The tilling depth can be 118.81 mm. This value is closer to the tilling depth of 120 mm in FIG. 7 than in the case of FIG. When the control as shown in FIG. 8B is performed, the actual inclination angle of the swing rake 66 is 116 °.

  Similarly, as shown in FIG. 9A, it is assumed that the rotary working machine 50 is tilted forward by 3 °. In this case, it is assumed that the pendulum member 72 shown in FIG. In this case, if the control device 90 controls the hydraulic cylinder 28 so that the output voltage of the potentiometer 74 is a voltage indicating the inclination angle 113 ° of the swing rake 66, the tilling depth is as shown in FIG. As shown in a), it is 105.22 mm. That is, when the rotary working machine 50 is tilted, the potentiometer 74 is also tilted by the same amount as the tilt amount. Therefore, even if the hydraulic cylinder 28 is controlled so that the voltage of the potentiometer 74 becomes a constant value, the case of FIG. Will have a different working depth.

  On the other hand, when the potentiometer 74 is fixed to the pendulum member 72 provided in the tilling depth information acquisition device 70 as in the present embodiment, the pendulum member 72 acts even if the rotary work machine 50 is tilted forward. The potentiometer 74 maintains a constant posture. In this case, the output voltage of the potentiometer 74 indicates a value obtained by rotating the rotary shaft 76a by the inclination of the rotary work machine 50. Therefore, if the control device 90 controls the hydraulic cylinder 28 and adjusts the height of the rotary working machine 50 so that the output voltage of the potentiometer 74 becomes a voltage corresponding to the inclination angle 113 °, FIG. ), The tilling depth can be 122.83 mm. This value is closer to the tilling depth of 120 mm in FIG. 7 than in the case of FIG. When the control shown in FIG. 9B is performed, the actual inclination angle of the swing rake 66 is 110 °.

  That is, in this embodiment, even when the rotary working machine 50 is tilted, the tilling depth can be reduced only by controlling the height position of the rotary working machine 50 so that the output voltage of the potentiometer 74 is kept constant. It becomes possible to maintain substantially constant.

  As described above in detail, according to the present embodiment, the swing rake 66, the sprockets 78a and 78b, and the roller chain 80 rotate the rotary shaft 76a according to the change in the vertical height position from the ground, and the potentiometer 74 detects information related to the rotation amount of the rotary shaft 76a, and the pendulum member 72 holding the potentiometer 74 maintains the posture of the potentiometer 74 in the vertical direction regardless of the posture change of the rotary work machine 50 with respect to the ground. That is, in this embodiment, the information (here, the output voltage) related to the rotation amount of the rotation shaft detected by the potentiometer includes not only the change in the height position but also the inclination amount of the rotary work machine 50 with respect to the ground. Therefore, even when the rotary working machine 50 is tilted, information (output voltage) relating to the tilling depth of the rotary working machine 50 can be obtained with high accuracy by taking the tilt into consideration.

  In the present embodiment, the tractor 100 includes the tractor main body 10, the rotary work machine 50 connected to the tractor main body 10, and the plowing depth information acquisition device 70. By operating the rotary working machine 50 using the tilling depth acquired with high accuracy, tillage at an appropriate tilling depth is possible.

  In the present embodiment, by using the pendulum member 72, it is possible to acquire information (output voltage) regarding the tilling depth in consideration of the inclination of the rotary working machine 50 without using a special inclination sensor or the like. Thereby, even if it does not perform complicated calculation etc., information about tilling depth can be acquired with high accuracy.

  In the present embodiment, the control device 90 controls the hydraulic cylinder 28 so that the voltage output from the potentiometer 74 becomes a predetermined value, and adjusts the height position of the rotary working machine 50. It is possible to automatically set the correct tillage depth.

  In the above-described embodiment, the case where the control device 90 controls the hydraulic cylinder 28 based on the output voltage of the potentiometer 74 has been described. However, the present invention is not limited to this. For example, the output voltage of the potentiometer 74 is determined by the operator. It may be displayed only on a visually observable monitor or the like. As a result, the operator can operate the hydraulic cylinder 28 so that the output voltage becomes a predetermined value, so that the same effect as in the above embodiment can be obtained.

  In addition, although the said embodiment demonstrated the case where the number of teeth of sprocket 78a, 78b was made the same, it is not restricted to this, It can also be set as the number of teeth differing. For example, when the number of teeth of the sprocket 78a is set to 26 and the number of teeth of the sprocket 78b is set to 24, the speed increasing ratio from the rotating shaft 76b to the rotating shaft 76a is 13/12. In this case, if the rotary working machine 50 is tilted by 3 ° (backward tilt), the control device 90 determines that the angle of change of the swing rake 66 is 2.77 ° with respect to the return angle by the pendulum member 72 of 3 °. A position of (≈3 ° × 12/13) is targeted. In this case, as shown in FIG. 10A, compared with the case of FIG. 8B, the plowing depth becomes deeper by 1.2 mm (≈119.98-118.81), which is almost 120 mm in FIG. Can be matched. Further, even when the rotary working machine 50 in FIG. 10 (a) tilts forward by 3 °, by performing the same control as described above, the tilling depth becomes 119.24 mm as shown in FIG. 10 (b). 7 can be made to substantially coincide with 120 mm. It should be noted that the optimum value of the speed increase ratio (or reduction ratio) is the rocking radius of the rocking rake 66 (the distance from the center of the rotating shaft 76b to the ground contact position of the rocking rake 66), the rotating shaft 76b, and the rotating claw. It is determined by the relationship of the distance from the lowest end position of the 52 rotation trajectories. Therefore, the speed increase ratio (or speed reduction ratio) may be determined in consideration of these factors.

  Although not mentioned in the above embodiment, as shown in FIG. 11, the mark M1 may be provided on a part of the pendulum member 72 and the mark M2 may be provided on the lower side in the vertical direction of the protective cover 62. . By providing the marks M1 and M2 in this way, it is possible to check whether the rotary working machine 50 is in the standard state (whether the PIC axis is horizontal). Therefore, for example, when performing the adjustment operation before starting the tilling work, the worker confirms the marks M1 and M2 and adjusts the length of the top link 24 so that the rotary work machine 50 is in the standard state. can do. This makes it possible to perform tillage work while suppressing torque fluctuations of the PTO shaft 12. Instead of the mark M2 on the protective cover 62 side, a scale indicating the angle of the rotary working machine 50 may be provided based on the positional relationship with the mark M1.

  In the embodiment described above, a case where the swing rake 66, the roller chain 80, or the like is used as a mechanism (position change transmission unit) that rotates the rotating shaft 76a in accordance with a change in the vertical height position from the ground is described. However, it is not limited to this. For example, as shown in FIG. 12, a grounding ring 166 and a link mechanism 168 that holds the grounding ring 166 may be used. In this case, the portion of the link mechanism 168 connected to the rotating shaft 76a rotates around the rotating shaft 76a according to the vertical movement of the grounding wheel 166. For this reason, even if the configuration of FIG. 12 is employed, information (output voltage) relating to tilling depth can be obtained with high accuracy by the potentiometer 74 fixed to the pendulum member 72 as in the above embodiment. A warped member or the like may be used instead of the ground ring.

  In the above embodiment, the case where the potentiometer 74 is used as the device for detecting the rotation amount of the rotating shaft 76a has been described. However, the present invention is not limited to this. For example, instead of the potentiometer, another measuring device such as a rotary encoder may be used.

  In the above embodiment, the rotary working machine 50 having the rotary claw 52 is adopted as the rotary working machine 50. However, the present invention is not limited to this, and a plow such as a bottom plow, a disk plow, or a rotary plow may be adopted. good.

  The above-described embodiment is an example of a preferred embodiment of the present invention. However, the present invention is not limited to this, and various modifications can be made without departing from the scope of the present invention.

10 Tractor body 28 Hydraulic cylinder (part of adjusting device)
50 Rotary work machine (cultivation work machine)
70 Plowing depth information acquisition device 74 Potentiometer (detection unit, part of rotation amount detection unit)
76a Rotation shaft (part of rotation amount detection unit)
78a Sprocket (part of position change transmission part, part of conversion part)
78b Sprocket (part of position change transmission part, part of conversion part)
66 Swing rake (part of position change transmission part, contact part)
80 Roller chain (part of position change transmission part, part of conversion part)
72 Pendulum member (Attitude maintenance part)
90 Control device (cultivation depth information acquisition unit, part of adjustment device)
M1 mark

Claims (6)

A rotation amount detection unit having a rotation shaft and a detection unit that is connected to the rotation shaft and detects information about the rotation amount of the rotation shaft;
A first gear provided in front of the tilling direction of the tilling work machine, having a different number of teeth from the first gear, and according to a change in the vertical height position from the ground A second gear that rotates, and a transmission member that transmits the rotation of the second gear to the first gear, and rotates the rotating shaft according to a change in a vertical height position from the ground. A position change transmission unit,
A posture maintaining unit that holds the detection unit and maintains the posture of the detection unit with respect to the vertical direction regardless of a change in the posture of the tillage working machine with respect to the ground;
A plowing depth information acquisition apparatus comprising: a plowing depth information acquisition unit that acquires information related to a plowing depth of the tilling work machine using a detection result of the detection unit. The position change transmission unit includes a contact unit that contacts the ground,
The tilling depth information acquiring apparatus according to claim 1, wherein the second gear rotates according to a change in the position of the contact portion in the vertical direction.   The tilling depth information acquiring apparatus according to claim 1, wherein the posture maintaining unit includes a pendulum member that holds the detection unit and is swingable with respect to the rotation shaft.   The tilling depth information acquisition device according to claim 3, wherein the pendulum member is provided with a mark indicating whether or not the tilling work machine is in a horizontal state. The tractor body,
A tillage work machine connected to the tractor body;
A tractor provided with the tilling depth information acquisition apparatus as described in any one of Claims 1-4 which acquires the information regarding the tilling depth of the said tilling work machine.   The adjustment apparatus which adjusts the height position of the said vertical direction of the said tilling work machine so that the information regarding the tilling depth acquired by the said tilling depth information acquisition apparatus may show the preset value is provided. The described tractor.

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