Boom sprayer

Abstract

To provide a boom sprayer capable of sufficiently securing a safe area surrounded by a main frame and a support frame.SOLUTION: A boom sprayer is configured so that, strength of a portal shaped main frame 25 which is erected to extend upward of a driver seat 6 and is provided on both sides in a vehicle lateral direction on a front side of the driver seat 6 on a vehicle body frame 3, is greater than that of a pair of support frames 26 which is separated in the vehicle lateral direction so as to extend in a vehicle cross direction, one end of each support frame is coupled to an upper part of the main frame 25 and the other end thereof is coupled to the vehicle 1 side on a rear side of the driver seat 6, and in forward rotation inversion with front wheels 12 of the vehicle 1 as fulcrums, even the main frame 25 collides with a collision object, deformation of the main frame 25 can be deformed, and a distance until the main frame 25 collides with the collision object is reduced, for reducing moment acting on the main frame 25 and suppressing the deformation of the main frame 25.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a boom sprayer. [Background technology]

[0002] Conventionally, boom sprayers are known in which side booms on both sides of a vehicle are extended so that they are aligned with a center boom provided at the front of the vehicle, and the vehicle is self-propelled by the driver while spraying chemicals from multiple spray nozzles provided on the center boom and side booms.

[0003] With this boom sprayer, there is a risk of it rotating forward around the front wheels as a fulcrum and tipping over, for example, when entering a farm field, etc. For this reason, the boom sprayer has a safety area secured by a safety frame to protect the driver in the event of tipping over due to forward rotation around the front wheels as a fulcrum.

[0004] For example, in the following Patent Document 1, a gate-shaped main frame serving as a main pillar is erected behind the driver's seat on the vehicle body frame (machine frame) so as to straddle the chemical tank from the left and right of the vehicle, and a gate-shaped front frame is erected in front of the driver's seat so as to be connected to the vehicle body frame, and the upper parts of the main frame on both left and right sides of the vehicle and the upper parts of the front frame on both left and right sides of the vehicle are connected by the respective upper frames to form a safety frame. The area surrounded by this safety frame is called the safety area. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2004-074094 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the boom sprayer described in Patent Document 1 above, when the vehicle rotates forward around the front wheels as a fulcrum and falls over, if the front gate-shaped front frame collides with an object such as the ground, as can be seen from Figures 1 to 3 of Patent Document 1, the gate-shaped front frame is made of thin round bars or round pipes, so there is a high possibility that it will deform and there is a risk that the safety area will be violated.

[0007] In addition, if the front front frame deforms and a colliding object collides with the rear main frame, the distance over which the rear main frame collides with the colliding object is longer than the distance over which the front frame collides with the colliding object, so the moment acting on the rear main frame becomes large, causing the rear main frame to also deform, and there is a risk that the safety area will become narrower.

[0008] The present invention has been made to solve such problems, and has an object to provide a boom sprayer in which a sufficient safety area can be secured. [Means for solving the problem]

[0009] The boom sprayer (100) according to the present invention comprises a vehicle (1) capable of self-propelling, on which a driver's seat (6), a chemical tank (11), and an engine room (10) are arranged from the front side in the longitudinal direction of the vehicle on a vehicle body frame (3); a center boom (20) arranged in front of the driver's seat (6) and extending in the left-right direction of the vehicle; a side boom (21) whose end is rotatably connected to the end of the center boom (20) and moves between an open position where it is aligned in a straight line with the center boom (20) and a closed position where it is rotated relative to the center boom (20) and folded to the side of the vehicle body frame (3); and a plurality of side booms (21) provided on the center boom (20) and the side booms (21) for spraying a chemical solution. The boom sprayer (100) is equipped with a spray nozzle (23) for spraying a spray nozzle for spraying a spray nozzle for spraying a spray nozzle for spraying a spray nozzle for spraying a spray nozzle for spraying a spray nozzle for spraying a spray nozzle for spraying a spray nozzle for spraying a spray nozzle for spraying a spray nozzle for spraying a spray nozzle for spraying a spray nozzle for spraying a spray nozzle for spraying a spray nozzle for spraying a spray nozzle for spraying a spray nozzle for spraying a spray nozzle for spraying a spray nozzle for spraying a spray nozzle for spraying a spray nozzle for spraying a spray nozzle for spraying a spray nozzle

[0010] According to such a boom sprayer (100), the strength of the gate-shaped main frame (25) erected on both sides of the vehicle in the left-right direction in front of the driver's seat (6) on the body frame (3) so as to extend above the driver's seat (6) is greater than the strength of a pair of support frames (26, 41) which are arranged at a distance from each other in the left-right direction of the vehicle so as to extend in the fore-and-aft direction of the vehicle, have one end connected to the upper part of the main frame (25) and the other end connected to the vehicle (1) side rearward of the driver's seat (6). Therefore, even if the front gate-shaped main frame (25) collides with an object such as the ground during a forward rotation and overturn with the front wheels (12) of the vehicle (1) as the fulcrum, deformation of the front gate-shaped main frame (25) can be largely suppressed. In addition, when the vehicle (1) rolls forward around the front wheels (12) as a fulcrum, the distance until the front main frame (25) hits the impact object is short and the moment acting on the main frame (25) is small, so that deformation of the front gate-shaped main frame (25) can be largely suppressed. As a result, a sufficient safety area surrounded by the main frame (25) and the support frames (26, 41) can be secured.

[0011] Here, the body frame (3) is provided at its front with a body frame square pipe (17) extending in the left-right direction of the vehicle, and the upper and lower frames (27) constituting the main frame (25) and extending in the up-down direction are provided at their lower parts with an insertion square pipe (30) protruding inward in the left-right direction of the vehicle, and it is preferable that the insertion square pipe (30) is inserted into the body frame square pipe (17) by inserting or extrapolating it. In the case where such a configuration is adopted, when the vehicle (1) rotates forward and falls about the front wheels (12) as a fulcrum, if the front gate-shaped main frame (25) collides with an impact object such as the ground and the socket pipe (30) of the main frame (25) attempts to rotate, the socket pipe (30) is inserted into the square pipe (17) of the body frame, so that the square pipes (17, 30) suppress the rotation of the socket pipe (30) relative to the square pipe (17) of the body frame, and the main frame (25) becomes one with the body frame (3), thereby suppressing deformation of the main frame (25).

[0012] In addition, it is preferable that the body frame square pipe (17) supports the rear link (16) of the four-bar link mechanism (15) of the boom device (2) that moves the center boom (20) up and down. When such a configuration is adopted, the square socket pipe (30) of the main frame (25) is supported on the body frame square pipe (17) that supports the rear link (16) of the four-bar link mechanism (15) of the boom device (2), so that the main frame (25) is firmly supported on the body frame (3).

[0013] In addition, when the other end of the support frame (26) extends and is connected to the rear end of the chemical solution tank (11), the other end of the rear support frame (26) constituting the safety frame (24) is connected at a position further rearward than in the prior art (JP Patent Publication No. 2004-074094) in which the rear main pillar constituting the safety frame was erected directly behind the side of the driver's seat. This makes it possible to expand the safety area rearward and makes it easier to get in and out of the driver's seat (6).

[0014] It is also preferable that the safety frame (24) includes a pair of standing parts (42) erected from both sides in the left-right direction of the vehicle at the rear of the body frame (3), and a boom receiver (43) extending in the left-right direction of the vehicle and spanning the standing parts (42) for receiving the side boom (21), and the other end of the support frame (41) is connected to the boom receiver (43).When such a configuration is adopted, the other end of the rear support frame (41) constituting the safety frame (24) is connected to the boom receiver (43) at the rear of the body frame (3), so that the safety area can be greatly expanded rearward, and the boom receiver (43) can be used for both purposes, reducing the number of parts. Effect of the Invention

[0015] In this way, according to the present invention, a boom sprayer that ensures a sufficient safety area can be provided. [Brief description of the drawings]

[0016] [Figure 1] FIG. 1 is a perspective view of a boom sprayer according to an embodiment of the present invention, viewed obliquely from above and in the front. [Diagram 2] FIG. 2 is a perspective view of the device shown in FIG. 1 with the sunshade, handle, operating device section, operating section, chemical hose, electric hydraulic cylinder, hydraulic hose, etc. removed. [Diagram 3] FIG. 3 is an enlarged perspective view showing a connection portion between a vehicle body frame square pipe and a main frame square socket pipe in FIGS. 1 and 2. [Figure 4] FIG. 3 is a perspective view showing a safety frame in FIGS. 1 and 2. [Diagram 5] FIG. 2 is a perspective view of the vehicle body frame square pipe before the main frame square pipe is connected to the vehicle body frame square pipe. [Figure 6] FIG. 11 is a perspective view showing a support frame of a boom sprayer according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] A preferred embodiment of the boom sprayer according to the present invention will be described below with reference to the accompanying drawings. Fig. 1 is a perspective view of the boom sprayer according to the embodiment of the present invention, seen from the front at an angle above. Fig. 2 is a perspective view of Fig. 1 with the sunshade, the handle for driving in front of the driver's seat and the operating device section for spraying the chemical solution, the operating section provided with an opening / closing lever for opening and closing the side boom arranged on the front side of the driver's seat, the chemical solution hose for sending the chemical solution to the spray nozzle, the electric hydraulic cylinder for raising and lowering the center boom, the hydraulic hose for the electric hydraulic cylinder, etc., removed. Fig. 3 is a perspective view showing an enlarged connection portion between the square pipe of the vehicle frame and the square plug pipe of the main frame in Figs. 1 and 2. Fig. 4 is a perspective view showing the safety frame in Figs. 1 and 2. Fig. 5 is a perspective view before the square pipe of the main frame is connected to the square pipe of the vehicle frame. The boom sprayer of this embodiment sprays a chemical solution on, for example, crops while traveling in a field, for example. In the following description, the terms "front," "rear," "left," and "right" are directions based on the boom sprayer.

[0018] As shown in FIGS. 1 and 2, the boom sprayer 100 is a self-propelled type and includes a travellable vehicle 1 and a boom device 2 for spraying a chemical solution from the vehicle 1.

[0019] The vehicle 1 is equipped with a body frame 3 having a generally rectangular shape that is long in the front-rear direction of the vehicle. As shown in Fig. 1, a driver's seat 6 is provided on the front of the body frame 3, which forms a space for an operator to sit in and drives the vehicle using a handlebar 4 and sprays a chemical solution using an operating device unit 5. An operating unit 8 is provided in front of the driver's seat 6 and includes an opening / closing lever 7 for opening and closing a side boom 21 (described below). A sunshade 9 is provided above the driver's seat 6. The sunshade 9 is installed on a safety frame 24 (described below).

[0020] 1 and 2, an engine room 10 that houses an engine, a chemical liquid pressure-feed pump, etc. is provided on the rear of the body frame 3. A chemical liquid tank 11 that contains the chemical liquid to be sprayed from the boom device 2 is mounted on the body frame 3 between the driver's seat 6 and the engine room 10.

[0021] A pair of front wheels 12 and a pair of rear wheels 13 are provided at the front and rear of the body frame 3 below both sides in the left-right direction of the vehicle. The front wheels 12 and rear wheels 13 rotate when driven by the engine. In this embodiment, the vehicle is four-wheel drive, so the front wheels 12 and rear wheels 13 rotate, but it may be front-wheel drive and rear-wheel drive. At the rear end of the body frame 3, steps 14 are provided for climbing up and down on the body frame 3.

[0022] A pair of four-bar link mechanisms 15 serving as boom lifts are disposed in the left-right direction of the vehicle so as to extend forward on the vehicle body frame 3 in front of the driver's seat 6. The boom device 2 is supported by the vehicle body frame 3 via the four-bar link mechanisms 15.

[0023] 1 to 3, the four-bar link mechanism 15 has a rear link 16 extending in the vertical direction fixed via a support member 18 to a highly rigid body frame square pipe 17 extending in the left-right direction of the vehicle at the front of the body frame 3 (see FIG. 3). When the four-bar link mechanism 15 is operated by the expansion and contraction action of an electric hydraulic cylinder (actuator) 44 as shown in FIG. 1, a horizontal control device 19 connected to the front link of the four-bar link mechanism 15 rises and falls (moves up and down).

[0024] 1 and 2, the boom device 2 includes a level control device 19 connected to a front link extending in the up-down direction of the four-bar link mechanism 15, a center boom 20 swingably connected to the level control device 19 and extending in the left-right direction of the vehicle, and a pair of side booms 21 rotatably connected to both ends of the center boom 20. The center boom 20 is supported by the level control device 19 so as to be swingable like a pendulum in the left-right direction of the vehicle so as to be kept horizontal by gravity. In other words, the center boom 20 becomes horizontal by gravity in accordance with the level control device 19. A locking device for arbitrarily stopping the level control of the center boom 20 is attached to the level control device 19.

[0025] Nozzle pipes 22 are attached along the center boom 20 and the side booms 21, and each nozzle pipe 22 has a plurality of spray nozzles 23 for spraying chemicals provided along the longitudinal direction. When spraying chemicals, the side boom 21 rotates from the closed position shown in the figure to an open position in which it is in a straight line with the center boom 20. In this way, the boom device 2 equipped with the center boom 20, side boom 21 and level control device 19 is supported by the vehicle body frame square pipe 17 via the four-bar link mechanism 15, and the strength of the vehicle body frame square pipe 17 is very high.

[0026] The liquid chemical pressure feed pump is driven while the vehicle is self-propelled by the engine, and the liquid chemical in the liquid chemical tank 11 is sprayed downward from the spray nozzle 23 via the nozzle pipe 22 of the center boom 20 and the side boom 21. When liquid chemical spraying is not being performed, the side boom 21 is rotated to the closed position shown in the figure and folded up, and is stored to the side of the body frame 3 with the rear raised at an angle.

[0027] The boom sprayer 100 is provided with a safety frame 24 for protecting the driver. The safety frame 24 includes a main frame 25 on the front side and a support frame 26 on the rear side, and the sunshade 9 is installed on the main frame 25 and the support frame 26.

[0028] As shown in Figures 1, 2 and 4, the main frame 25 is formed in a gate shape and is erected on the body frame 3 in front of the driver's seat 6 on both sides in the left-right direction of the vehicle, extending above the driver's seat 6, as shown in Figures 1 and 2.

[0029] The support frames 26 are provided in a pair, spaced apart in the left-right direction of the vehicle, extending in the fore-and-aft direction of the vehicle, with one end connected to the upper part of the main frame 25 and the other end connected onto the rear end of the chemical liquid tank 11.

[0030] The main frame 25 here is made up of square pipes, and as shown in FIG. 4, consists of upper and lower frames 27 which are spaced apart in the left-right direction of the vehicle and extend in the vertical direction and are connected via a curved frame 28 to a connecting frame 29 which also extends in the left-right direction of the vehicle. For assembly purposes, the connecting frame 29 is divided into two parts here.

[0031] A square socket pipe 30 that protrudes inward in the left-right direction of the vehicle is provided at the lower part of the upper and lower frames 27, and is inserted into the body frame square pipe 17 (see Figs. 3 and 5). A mounting member 31 for mounting the square socket pipe 30 to the support member 18 (see Figs. 3 and 5) is fixed, for example by welding, to a position of the square socket pipe 30 close to the upper and lower frames 27. A recess 33 is formed on the inside of the mounting member 31 to accommodate a portion 32 (see Fig. 5) of the body frame square pipe 17 that protrudes outward in the left-right direction of the vehicle from the support member 18. Note that some bolts, nuts, etc. are omitted in Figs. 3 and 5.

[0032] Then, the portion 32 (see FIG. 5) of the square socket pipe 30 of the upper and lower frames 27 that protrudes outward in the left-right direction of the vehicle from the support member 18 of the square socket pipe 17 is inserted into the square socket pipe 17 as shown in FIG. 3, while the mounting member 31 is abutted against the support member 18, and the mounting member 31 is fixed to the support member 18 by fastening means such as bolts and nuts.

[0033] In this state, the opposing surfaces of the vehicle body frame square pipe 17 and the square socket pipe 30 inserted into the vehicle body frame square pipe 17 are in a state of almost contact with each other.

[0034] Next, as shown in FIG. 4, the upper parts of the upper and lower frames 27 are connected to each other at the joints 34 via the curved frames 28 and the connecting frames 29, thereby obtaining the gate-shaped main frame 25 connected to the body frame square pipes 17, as shown in FIG. 2.

[0035] The support frame 26 here is made up of round pipes, and as shown in FIG. 4, is configured by connecting front and rear frames 35 which are spaced apart in the left-right direction of the vehicle and extend in the front-rear direction of the vehicle, via an inclined frame 36 which inclines downward and to the rear, and a curved frame 37, to a lower frame 38 which extends downward, and the front and rear frames 35 are connected and reinforced by a reinforcing frame 39 which extends in the left-right direction of the vehicle.

[0036] Then, the front and rear frames 35 of the support frame 26 are connected to the upper part of the gate-shaped main frame 25, and the lower frame 38 of the support frame 26 is fixed onto the rear end of the chemical tank 11 by fastening means such as bolts and nuts, as shown in Figure 2, thereby obtaining a safety frame 24 that ensures a safety area around the driver's seat 6.

[0037] Here, particularly in this embodiment, the strength of the main frame 25 is greater than the strength of the support frame 26 .

[0038] Specifically, the square pipes constituting the main frame 25 are made of STKR400 (square steel pipes) and have a tensile strength of 400 N / mm 2 , wall thickness of 3.2 mm, part dimensions of 50 mm x 50 mm, and section modulus of 8787.836928 are used.

[0039] On the other hand, the round pipes constituting the support frame 26 are made of SGP (carbon steel pipes for piping) and have a tensile strength of 290 N / mm 2 , wall thickness 2.3 mm, part dimensions diameter 31.8 mm, and section modulus 1467.197592 are used.

[0040] Thus, even when simply comparing the tensile strength, the main frame 25 is stronger than the support frame 26 by a large margin.

[0041] Incidentally, since the main frame 25 has a gate-shaped configuration, sufficient strength is ensured against loads from the left and right directions of the vehicle compared to a case in which only the upper and lower frames 27 are provided (without the connecting frame 29).

[0042] According to the boom sprayer 100 configured in this manner, when the vehicle rolls forward around the front wheels 12 as a fulcrum when entering a field or the like, for example, the strength of the gate-shaped main frame 25 erected on both sides of the vehicle left and right direction in front of the driver's seat 6 in the vehicle body frame 3 so as to extend above the driver's seat 6 is higher than the strength of the support frame 26, which is provided in a pair spaced apart in the vehicle left and right direction so as to extend in the vehicle front-rear direction, one end of which is connected to the upper part of the main frame 25 and the other end of which is connected to the rear end of the chemical tank 11 on the vehicle 1 side behind the driver's seat 6. Therefore, even if the front gate-shaped main frame 25 collides with a collision object such as the ground, deformation of the front gate-shaped main frame 25 can be largely suppressed. In addition, when the vehicle rolls forward around the front wheels 12 as a fulcrum, the distance until the front main frame 25 collides with the collision object is short and the moment acting on the main frame 25 is small, so deformation of the front gate-shaped main frame 25 can be largely suppressed. As a result, a sufficient safety area surrounded by the main frame 25 and the support frame 26 can be ensured.

[0043] Furthermore, according to this embodiment, the body frame 3 is provided at its front with the body frame square pipe 17 extending in the left-right direction of the vehicle, and the upper and lower frames 27 which constitute the main frame 25 and extend in the up-down direction are provided at their lower parts with the square socket pipe 30 which protrudes inward in the left-right direction of the vehicle, and the square socket pipe 30 is inserted into the body frame square pipe 17 by insertion. Therefore, even if the front gate-shaped main frame 25 collides with an object such as the ground during a forward rotation and overturn with the front wheel 12 as the fulcrum and the square socket pipe 30 of the main frame 25 attempts to rotate, the square pipes 17, 30 suppress the rotation of the square socket pipe 30 relative to the body frame square pipe 17, and the main frame 25 becomes one with the body frame 3, thereby suppressing deformation of the main frame 25.

[0044] In addition, since the square socket pipe 30 of the main frame 25 is supported by the square body frame pipe 17 which supports the rear link 16 of the four-bar link mechanism 15 of the boom device 2, the main frame 25 is firmly supported by the body frame 3.

[0045] Furthermore, compared to the prior art (JP Patent Publication No. 2004-074094), in which the rear main pillar constituting the safety frame was erected directly behind the driver's seat, the other end of the rear support frame 26 constituting the safety frame 24 is connected to the rear end of the chemical tank 11, which is in a more rearward position, so that the safety area can be expanded rearward and getting in and out of the driver's seat 6 is easier.

[0046] FIG. 6 is a perspective view showing a support frame of a boom sprayer according to another embodiment of the present invention.

[0047] This embodiment differs from the previous embodiment in that the inclined frame 36, curved frame 37 and lower frame 38 (see Figure 4) of the support frame 26 are replaced with a support frame 41 equipped with an inclined frame 40 that extends further rearward.

[0048] Here, a pair of standing portions 42 are erected on both sides of the rear end, which is the rear part of the body frame 3, in the left-right direction of the vehicle, and a boom receiver 43 that extends in the left-right direction of the vehicle and is for receiving the side boom 21 is suspended and connected above the pair of standing portions 42.

[0049] The rear end of the inclined frame 40, which is the other end of the support frame 41, is connected to the boom receiver 43 via fastening means such as a U-bolt or a nut.

[0050] According to this configuration, the other end of the rear support frame 41 that constitutes the safety frame is connected to the boom receiver 43 on the rear side of the body frame 3, so that the safety area can be greatly expanded toward the rear and the boom receiver 43 can be used for both purposes, reducing the number of parts.

[0051] Although the present invention has been specifically described based on the embodiments thereof, the present invention is not limited to the above-mentioned embodiments. For example, in the above-mentioned embodiment, the square socket pipe 30 is inserted into the square pipe 17 of the body frame by internal insertion, which is considered to be particularly suitable, but it may be inserted by extrapolation.

[0052] Further, in the above embodiment, the four-bar link mechanism 15 is used, but a boom lift other than the four-bar link mechanism 15 may be used.

[0053] In the above embodiment, the vehicle frame square pipe 17 and the socket square pipe 30 are used, but for example, round pipes may be used. In this case, however, it is necessary to fix them by welding or the like so that they do not rotate relative to each other.

[0054] Further, the reinforcing frame 39 of the support frames 26, 41 may be omitted. Furthermore, the other end of the support frame may be configured to be gate-shaped and connected to the vehicle 1 side.

[0055] In addition, in the above embodiment, square pipes are used for the main frame 25 as this is particularly preferable, but SS400 (general structural rolled steel) may also be used as a steel material having the same strength as the above-mentioned STKR400. In this case, one example of a configuration is to connect the main frame 25 to the vehicle body frame 3 on or to the side thereof via a bracket or the like, using fastening means such as bolts and nuts, or by welding.

[0056] Furthermore, the members and materials used for the main frame 25 and the support frames 26 and 41 are not limited to those mentioned above. What is important is that the strength of the main frame 25 is greater than the strength of the support frames 26 and 41.

[0057] In addition, in the above embodiment, the side booms 21 are connected to both ends of the center boom 20, but the present invention can also be applied to a boom sprayer in which the side booms 21 are connected to only one end of the center boom 20.

[0058] The present invention can also be applied to a crawler-type boom sprayer in which a crawler is fitted between a drive wheel and an idler wheel that are rotatably mounted on a body frame that constitutes a vehicle and spaced apart in the fore-and-aft direction. [Explanation of symbols]

[0059] 1...vehicle, 2...boom device, 3...body frame, 6...driver's seat, 10...engine room, 11...chemical tank, 15...four-section link mechanism, 16...rear link, 17...body frame square pipe, 20...center boom, 21...side boom, 23...spray nozzle, 24...safety frame, 25...main frame, 26, 41...support frames, 27...upper and lower frames, 30...square socket pipe, 42...standing section, 43...boom support, 100...boom sprayer.

Claims

1. A boom sprayer (100) including a self-propelled vehicle (1) having a driver's seat (6), a chemical tank (11), and an engine room (10) arranged on a vehicle body frame (3) from the front side in the vehicle longitudinal direction, a center boom (20) arranged in front of the driver's seat (6) and extending in the left-right direction of the vehicle, an end of which is rotatably connected to an end of the center boom (20) and which moves between an open position where it is aligned in a straight line with the center boom (20) and a closed position where it is rotated relative to the center boom (20) and folded to the side of the vehicle body frame (3), and a plurality of spray nozzles (23) provided on the center boom (20) and the side boom (21) for spraying a chemical solution, a gate-shaped main frame (25) provided upright on both sides of the vehicle left-right direction in front of the driver's seat (6) in the vehicle body frame (3) so as to extend above the driver's seat (6); a pair of support frames (26, 41) extending in the vehicle longitudinal direction and spaced apart from each other in the vehicle transverse direction, one end of which is connected to an upper portion of the main frame (25) and the other end of which is connected to a side of the vehicle (1) rearward of the driver's seat (6); The boom sprayer (100) is characterized in that the strength of the main frame (25) is greater than the strength of the support frames (26, 41).

2. The vehicle body frame (3) is provided at its front with a vehicle body frame square pipe (17) extending in the left-right direction of the vehicle, The upper and lower frames (27) constituting the main frame (25) and extending in the vertical direction are provided at their lower parts with square socket pipes (30) protruding inward in the left-right direction of the vehicle, 2. The boom sprayer (100) according to claim 1, wherein the socket pipe (30) is inserted into the vehicle frame square pipe (17) by inserting or extrapolating.

3. The boom sprayer (100) according to claim 2, characterized in that the vehicle frame square pipe (17) supports a rear link (16) of a four-bar link mechanism (15) of a boom device (2) that moves the center boom (20) up and down.

4. The boom sprayer (100) according to any one of claims 1 to 3, characterized in that the other end of the support frame (26) extends and is connected to the rear end of the chemical tank (11).

5. A pair of upright portions (42) erected on both sides of the rear portion of the body frame (3) in the left-right direction of the vehicle; a boom receiver (43) extending in the left-right direction of the vehicle, spanning the upright portion (42), and receiving the side boom (21); The boom sprayer (100) according to any one of claims 1 to 3, characterized in that the other end of the support frame (41) is connected to the boom receiver (43).

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