JP2023150116A - boom sprayer - Google Patents

Abstract

To provide a boom sprayer capable of suppressing decrease in visibility of an operator and suppressing damage of an expandable cylinder.SOLUTION: An elevating device 30 of a boom sprayer 1 includes a pair of four-section link mechanisms 100 arranged separately from each other in a horizontal direction, and the respective four-section link mechanisms 100 include an expandable cylinder 160 connected between two different members, of a first link member 110, a second link member 120, a third link member 130 and a fourth link member 140. The expandable cylinder 160 is positioned above the third link member 130 and extends along the third link member 130 seen from a vertical direction.SELECTED DRAWING: Figure 2

Description

TECHNICAL FIELD This disclosure relates to boom sprayers.

Patent Document 1 discloses a boom sprayer. This boom sprayer has a lifting device including a pair of left and right four-bar link mechanisms at the front end of the vehicle body frame. Each four-bar link mechanism includes a rear link located at the front end of the vehicle body frame, a front link located at the front opposite to the rear link, and an upper part of the rear link and an upper part of the front link. It includes a connected upper link, and a lower link connected to the lower part of the rear link and the lower part of the front link. The pair of upper links are connected to each other by an upper stay for reinforcement, and the pair of lower links are connected to each other by a lower stay for reinforcement. A hydraulic cylinder is connected between the left-right center part of the lower stay and the left-right center part of the center boom provided on the front link, and a pair of four-bar links are connected in accordance with the operation of the hydraulic cylinder. It's supposed to work.

Japanese Patent Application Publication No. 2018-186777

In the above-mentioned boom sprayer, the telescopic cylinder 160, typically a hydraulic cylinder, is placed in the center of the lifting device in the left-right direction, so it is difficult to see the operator who is operating the vehicle while driving or other operations inside the cabin. may decrease. Further, when the vehicle travels in a field or the like, the telescopic cylinder 160 may be damaged due to contact with an object below.

An object of one embodiment of the present disclosure is to provide a boom sprayer that can suppress deterioration in operator visibility and also suppress damage to the telescopic cylinder 160.

An example of a boom sprayer is a boom sprayer including a traveling body (3) having a cabin (7) at the front, and a boom device (4) provided in the traveling body (3) in front of the cabin (7). The boom device (4) includes a lifting device (30) fixed in front of the cabin (7) and a boom part (40) provided at the front of the lifting device (30). (30) includes a pair of four-bar link mechanisms (100) arranged apart from each other in the left-right direction, and each four-bar link mechanism (100) has a first link member extending along the vertical direction. (110), a second link member (120) whose rear end is rotatably supported on the upper end of the first link member (110), and a rear end rotatably supported on the lower end of the first link member (110). a third link member (130) that is supported by Connected between the four link members (140) and two different ones of the first link member (110), the second link member (120), the third link member (130), and the fourth link member (140). The telescopic cylinder (160) is located above the third link member (130) and extends along the third link member (130) when viewed from above and below. It has been extended.

In the boom sprayer described above, the position of the fourth link member (140) relative to the first link member (110) can be raised or lowered as the telescoping cylinder (160) expands and contracts. The telescopic cylinder (160) extends along the third link member (130) of each four-bar link mechanism (100), and the pair of four-bar link mechanisms (100) are spaced apart from each other in the left and right directions. ing. Therefore, when viewed from the operator inside the cabin (7), the telescopic cylinder (160) is located at the position of each of the four-bar link mechanisms (100) arranged on the left and right, and The visibility of the area between the two is suppressed from being impaired. Further, since the telescoping cylinder (160) is located above the third link member (130), the third link member (130) at least partially protects the telescoping cylinder (160) from objects below. I can do it. Therefore, the boom sprayer described above suppresses a decrease in visibility for the operator and also suppresses damage to the telescopic cylinder (160).

The telescoping cylinder (160) may be connected to the first link member (110) and the second link member (120). In particular, one end of the telescopic cylinder (160) may be connected to a position closer to the fourth link member (140) than the longitudinal center of the second link member (120). According to such a configuration, the second link member (120) to which a load is easily applied is supported by the telescopic cylinder (160), so that the rigidity of the four-bar link mechanism (100) can be increased.

The second link member (120) is made of a square steel pipe, and one end of the telescopic cylinder (160) may be connected to a mounting piece (125) projecting downward from the square steel pipe. According to such a configuration, a square steel pipe with high rigidity can be used as the second link member (120), so that the rigidity of the four-bar link mechanism (100) can be further increased.

In the first link member (110), the distance between the supporting position of the second link member (120) and the supporting position of the third link member (130) may exceed 275 mm. In such a configuration, the distance between the support position of the second link member (120) and the support position of the third link member (130) is greater than that in the past, so the strength against torsion is improved. . Therefore, the elevating device (30) can be stably operated without having the reinforcing upper stay and lower stay that are conventionally required. Since an upper stay and a lower stay are not required, visibility of the area between the pair of four-bar link mechanisms (100) is improved.

According to one aspect of the present disclosure, it is possible to provide a boom sprayer that suppresses a decrease in operator visibility and suppresses damage to the telescopic cylinder 160.

FIG. 2 is a perspective view of an example boom sprayer seen diagonally from the front. FIG. 2 is a perspective view of one example of the boom device as seen diagonally from the rear. FIG. 2 is a plan view of an example boom device viewed from above. It is a side view of an example boom device. It is a side view of an example boom device.

Hereinafter, an example of a boom sprayer will be specifically described with reference to the drawings. For convenience, substantially the same elements may be given the same reference numerals and their descriptions may be omitted. In the description, reference may be made to the XYZ orthogonal coordinate system shown in the drawings. Unless otherwise specified, the description will be made assuming that the X direction is the front-rear direction, the Y direction is the left-right direction or the width direction, and the Z direction is the up-down direction with respect to the boom sprayer.

FIG. 1 is a perspective view of an example of a boom sprayer as viewed diagonally from the front. A boom sprayer is a self-propelled riding management machine that sprays a liquid such as a chemical solution onto farmland or crops in a field. The boom sprayer 1 includes a traveling body 3 having a body frame, and a boom device 4 attached to the front part of the traveling body 3. The boom device 4 includes a lifting device 30 supported by the traveling body 3 and a boom section 40 supported by the lifting device 30. The boom section 40 includes a center boom 41 and a pair of side booms 43 connected to both ends of the center boom 41. The center boom 41 and the side booms 43 each have a liquid supply pipe for spraying a chemical solution, which is provided with a plurality of nozzles. When performing chemical spraying, the side booms 43 are deployed in a straight line with respect to the center boom 41, as shown in FIG. The side boom 43 is stored in a folded state when not spraying chemical liquid. The illustrated side boom 43 is a multi-stage telescopic boom, and is in an extended state when the boom is deployed and in a contracted state when the boom is retracted.

A cabin 7 is provided at the front of the traveling body 3 and forms a space in which a worker is seated. An engine room 8 for housing an engine is provided at the rear of the traveling body 3. A chemical liquid tank 9 is provided between the cabin 7 and the engine room 8 to accommodate the chemical liquid sprayed from the center boom 41 and the side booms 43. The traveling body 3 includes a pair of front wheels 11 and a pair of rear wheels 12.

Next, the boom device 4 will be further explained. FIG. 2 is a perspective view of the boom device 4 viewed diagonally from the rear. FIG. 3 is a plan view of the boom device viewed from above. 4 and 5 are side views of the boom device. In the boom device 4 shown in FIGS. 2 to 5, the side boom 43 is omitted. Moreover, FIG. 4 shows a state in which the boom part is in a low position by the lifting device, and FIG. 5 shows a state in which the boom part is in a high position by the lifting device.

As shown in FIG. 2, the lifting device 30 includes a pair of four-bar link mechanisms 100 that are spaced apart from each other in the left-right direction. The pair of four-bar link mechanisms 100 may be spaced apart from each other by a distance approximately equal to the width of the cabin 7 in the left-right direction. In the elevating device 30 as an example, the horizontal position of the four-bar link mechanism 100 located on the right side corresponds to the position of the right end of the cabin 7, and the horizontal position of the four-bar link mechanism 100 located on the left side corresponds to the left end position of cabin 7 (see Figure 1).

Each of the four-bar linkage mechanisms 100 includes a first link member 110, a second link member 120, a third link member 130, and a fourth link member 140. The first link member 110 is fixed to the traveling body 3 and extends in the vertical direction. The first link member 110 as an example includes a pair of side walls 111 that face each other in the left-right direction, and a rear wall 113 that connects the rear ends of the pair of side walls 111. Further, the first link member 110 includes a mounting piece 115 that extends rearward and continues from the side wall 111 located on the outer side in the left-right direction. The attachment piece 115 is a part fixed to the front side of the cabin 7 of the traveling body 3.

The second link member 120 is rotatably supported by the upper end of the first link member 110. For example, the rear end of the second link member 120 is disposed between the pair of side walls 111 of the first link member 110, and is supported by a rotation shaft 112 provided between the pair of side walls 111 (see FIG. 3). . When viewed from the top and bottom, the second link member 120 extends along the front-back direction. The second link member 120 is an example of a square steel pipe.

The third link member 130 is rotatably supported by the lower end of the first link member 110. For example, the rear end of the third link member 130 is disposed between the pair of side walls 111 of the first link member 110 and supported by a rotation shaft 114 provided between the pair of side walls 111. When viewed from the top and bottom, the third link member 130 extends along the front-rear direction and overlaps the second link member 120. The third link member 130 is an example of a square steel pipe. For example, the width of the third link member 130 in the left-right direction may be the same as the width of the second link member 120 in the left-right direction. In this case, the second link member 120 and the third link member 130 may be formed of square steel pipes of the same size. In the first link member 110, the distance between the support position (rotation axis) of the second link member 120 and the support position of the third link member 130 exceeds 275 mm. As an example, the distance between the supporting position of the second link member 120 and the supporting position of the third link member 130 in the first link member 110 may be 300 mm, 400 mm, 500 mm, etc., but is not limited thereto. Note that the lengths of the second link member 120 and the third link member 130 are twice the distance between the supporting position of the second link member 120 and the supporting position of the third link member 130 in the first link member 110. It may be about 3 times as large.

The fourth link member 140 extends along the vertical direction. The upper end of the fourth link member 140 is rotatably supported by the front end of the second link member 120, and the lower end of the fourth link member 140 is rotatably supported by the front end of the third link member 130. Note that the fourth link member 140 in the illustrated example includes an upper extension portion 149 that protrudes above the connection position with the second link member 120. The upper extension part 149 is provided with a horizontal holding mechanism 48 for maintaining the horizontal state of the boom part 40, and the center boom 41 and the side booms 43 are connected to the lifting device 30 via this horizontal holding mechanism 48. is supported by

An example of the fourth link member 140 includes a pair of side walls 141 that face each other in the left-right direction, and a front wall 143 that connects the front ends of the pair of side walls 141. For example, the front end of the second link member 120 is disposed between a pair of side walls 141 of the fourth link member 140 and supported by a rotation shaft 142 provided between the pair of side walls 141. Further, the front end of the third link member 130 is disposed between the pair of side walls 141 of the fourth link member 140 and supported by a rotation shaft 144 provided between the pair of side walls 141.

In the fourth link member 140, the distance between the supporting position of the second link member 120 and the supporting position of the third link member 130 exceeds 275 mm. In one example, the distance from the support position of the second link member 120 on the fourth link member 140 to the support position of the third link member 130 is the distance from the support position of the second link member 120 on the first link member 110 to the support position of the third link member 130. It may be the same as the distance to the support position of 130. Further, the distance from the support position of the first link member 110 on the second link member 120 to the support position of the fourth link member 140 is the distance from the support position of the first link member 110 on the third link member 130 to the support position of the fourth link member 140. may be the same as the distance to the supporting position. That is, the four-bar link mechanism 100 as an example may be a four-bar parallel link mechanism.

The pair of four-bar link mechanisms 100 are connected to each other by a connecting member. In one example, the pair of four-bar link mechanisms 100 are connected to each other by a first connecting member 151, a second connecting member 153, and a third connecting member 155. The first connecting member 151 connects the first link members 110 to each other. For example, the first connecting member 151 is a square steel pipe extending along the left-right direction, and is fixed to the vertical center of one first link member 110 and the vertical center of the other first link member 110. has been done.

The second connecting member 153 and the third connecting member 155 connect the fourth link members 140 to each other. For example, the second connecting member 153 and the third connecting member 155 are square steel pipes extending in the left-right direction. The second connecting member 153 is fixed to an upper portion of one fourth link member 140 in the vertical direction and an upper portion of the other fourth link member 140 in the vertical direction. The third connecting member 155 is fixed to a lower portion of one fourth link member 140 in the vertical direction and a lower portion of the other fourth link member 140 in the vertical direction.

The pair of four-bar link mechanisms are operated by telescopic cylinders 160 provided respectively. The telescopic cylinder 160 connects two different ones of the first link member 110, the second link member 120, the third link member 130, and the fourth link member 140. In the four-bar link mechanism 100, the relative height position of the fourth link member 140 with respect to the first link member 110 is changed by the telescopic cylinder 160 extending and contracting. That is, by expanding and contracting the telescopic cylinder 160, the height position of the fourth link member 140, which is the front part of the lifting device 30, can be changed.

In one example, telescoping cylinder 160 is a hydraulic cylinder that includes cylinder tube 161 and cylinder rod 163. The size of the telescopic cylinder 160 in the left-right direction is not particularly limited, but may be approximately the same as or smaller than the size of the third link member 130 in the left-right direction. In the illustrated telescopic cylinder 160, the diameter of the cylinder rod 163 is smaller than the width of the third link member 130, and the diameter of the cylinder tube 161 is the same as or slightly larger than the width of the third link member 130.

The telescopic cylinder 160 is arranged above the third link member 130. The telescopic cylinder 160 extends along the third link member 130 when viewed from the top and bottom. The telescopic cylinder 160 connects the first link member 110 and the second link member 120. In the illustrated example, the end of the cylinder tube 161 of the telescopic cylinder 160 is disposed between the pair of side walls 111 of the first link member 110 and supported by a rotation shaft 116 provided between the pair of side walls 111. For example, the end of the cylinder tube 161 is connected to the vertical center of the first link member 110.

The end of the cylinder rod 163 of the telescopic cylinder 160 is rotatably supported by a mounting portion provided on the second link member 120. The attachment portion is provided at a position closer to the fourth link member 140 than the center of the second link member 120 in the longitudinal direction. The mounting portion is constituted by a pair of left and right mounting pieces 125. The mounting pieces 125 are provided so as to protrude downward from the left and right side surfaces of the second link member 120 made of a square steel pipe, respectively. The end of the cylinder rod 163 of the telescopic cylinder 160 is disposed between the pair of attachment pieces 125 and supported by a rotation shaft 126 provided between the pair of attachment pieces 125.

In the lifting device 30, the telescopic cylinder 160 in each of the pair of four-bar link mechanisms 100 is brought into a contracted state, so that the fourth link member 140 is controlled to be in a low position (see FIG. 3), and the fourth link member 140 is controlled to be in a low position (see FIG. 3). When the telescopic cylinders 160 in each of the link mechanisms 100 are extended, the fourth link member 140 is controlled to be in a high position (see FIG. 4). By controlling the length of the telescopic cylinder 160, the height of the fourth link member 140 can be controlled to a desired position within a predetermined range. In one example, each telescopic cylinder 160 of the pair of four-bar link mechanisms may be controlled by a control device (not shown) so that the length is always the same.

As described above, the example boom sprayer 1 includes the traveling body 3 having the cabin 7 in the front part, and the boom device 4 provided in front of the cabin 7 in the traveling body 3. The boom device 4 includes a lifting device 30 fixed to the front of the cabin 7 and a boom section 40 provided at the front of the lifting device 30. The lifting device 30 includes a pair of four-bar link mechanisms 100 that are spaced apart from each other in the left-right direction. Each of the four-bar link mechanisms 100 includes a first link member 110 that extends in the vertical direction, a second link member 120 whose rear end is rotatably supported at the upper end of the first link member 110, and a second link member 120 that is rotatably supported at the upper end of the first link member 110. A third link member 130 whose rear end is rotatably supported by the lower end of the first link member 110, a third link member 130 which is rotatably supported by the front end of the second link member 120 and the front end of the third link member 130, and is rotatably supported in the vertical direction. A telescopic cylinder connected between a fourth link member 140 extending along the line and two different ones of the first link member 110, the second link member 120, the third link member 130, and the fourth link member 140. 160. The telescopic cylinder 160 is located above the third link member 130 and extends along the third link member 130 when viewed from above and below.

In the boom sprayer 1 described above, the position of the fourth link member 140 relative to the first link member 110 can be moved up and down as the telescopic cylinder 160 expands and contracts. The telescopic cylinder 160 extends along the third link member 130 of each of the four-bar link mechanisms 100, and the pair of four-bar link mechanisms 100 are spaced apart from each other in the left and right directions. Therefore, when viewed from the operator inside the cabin 7, the telescopic cylinder 160 is located at the position of each of the four-bar link mechanisms 100 arranged on the left and right, and the area between the pair of four-bar link mechanisms 100 is easily visible. damage is suppressed. Moreover, since the telescoping cylinder 160 is located above the third link member 130, the third link member 130 can at least partially protect the telescoping cylinder 160 from objects below. Therefore, in the boom sprayer 1 described above, a decrease in visibility for the operator is suppressed, and damage to the telescopic cylinder 160 is suppressed.

The telescopic cylinder 160 may be connected to the first link member 110 and the second link member 120. In particular, one end of the telescopic cylinder 160 may be connected to a position closer to the fourth link member 140 than the longitudinal center of the second link member 120. According to such a configuration, the second link member 120 to which a load is easily applied is supported by the telescopic cylinder 160, so that the rigidity of the four-bar link mechanism 100 can be increased.

The second link member 120 is made of a square steel pipe, and one end of the telescopic cylinder 160 may be connected to a mounting piece 125 that projects downward from the square steel pipe. According to such a configuration, a square steel pipe with high rigidity can be used as the second link member 120, so that the rigidity of the four-bar link mechanism 100 can be further increased.

In the first link member 110, the distance between the supporting position of the second link member 120 and the supporting position of the third link member 130 exceeds 275 mm. According to such a configuration, the telescopic cylinder 160 can be appropriately arranged in the area inside the four-bar linkage mechanism. Further, since the distance between the supporting position of the second link member 120 and the supporting position of the third link member 130 is set larger than that in the conventional case, the strength against torsion is improved. Therefore, the elevating device 30 can be stably operated without having the reinforcing upper stay and lower stay that are conventionally required. Since an upper stay and a lower stay are not required, the visibility of the area between the pair of four-bar link mechanisms 100 is improved.

Although one embodiment has been described above in detail with reference to the drawings, the specific configuration is not limited to this embodiment.

For example, although an example has been shown in which the telescopic cylinder 160 is connected between the first link member 110 and the second link member 120, the telescopic cylinder is connected between the first link member 110, the second link member 120, and the third link member. 130 and the fourth link member 140, two different from each other may be connected.

Further, in the first link member 110, an example in which the distance between the supporting position of the second link member 120 and the supporting position of the third link member 130 exceeds 275 mm has been shown; The distance between the position and the support position of the third link member 130 may be 275 mm or less. For example, even if the distance between the supporting position of the second link member 120 and the supporting position of the third link member 130 is about 200 mm, the telescopic cylinder 160 can be arranged in the area inside the four-bar link mechanism. However, as described above, the stability of the lifting device is improved by increasing the distance between the supporting position of the second link member 120 and the supporting position of the third link member 130.

DESCRIPTION OF SYMBOLS 1... Boom sprayer, 3... Traveling body, 4... Boom device, 7... Cabin, 30... Lifting device, 40... Boom part, 100... Four-bar link mechanism, 110... First link member, 120... Second link member, 130... Third link member, 140... Fourth link member, 160... Telescopic cylinder.

Claims (5)

a traveling aircraft (3) having a cabin (7) at the front;
A boom sprayer comprising a boom device (4) provided in front of the cabin (7) in the traveling body (3),
The boom device (4) includes:
a lifting device (30) fixed in front of the cabin (7);
a boom part (40) provided at the front part of the lifting device (30),
The elevating device (30) includes a pair of four-bar link mechanisms (100) spaced apart from each other in the left-right direction,
Each of the four-bar linkage mechanisms (100) is
a first link member (110) extending along the vertical direction;
a second link member (120) whose rear end is rotatably supported by the upper end of the first link member (110);
a third link member (130) whose rear end is rotatably supported by the lower end of the first link member (110);
a fourth link member (140) rotatably supported by the front end of the second link member (120) and the front end of the third link member (130) and extending in the up-down direction;
A telescopic cylinder ( 160),
The telescopic cylinder (160) is a boom that is located above the third link member (130) and extends along the third link member (130) when viewed from the top and bottom. sprayer. The boom sprayer of claim 1, wherein the telescoping cylinder (160) is connected to the first link member (110) and the second link member (120). The boom sprayer according to claim 2, wherein one end of the telescoping cylinder (160) is connected to a position closer to the fourth link member (140) than the longitudinal center of the second link member (120). . The second link member (120) is made of a square steel pipe,
The boom sprayer according to any one of claims 1 to 3, wherein one end of the telescopic cylinder (160) is connected to a mounting piece (125) projecting downward from a square steel pipe. In the first link member (110), the distance between the supporting position of the second link member (120) and the supporting position of the third link member (130) exceeds 275 mm. 4. The boom sprayer according to any one of 4.

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