JPH077765U - Nozzle / boom device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a nozzle / boom device in which there is little risk of damage to the attachment parts between the lower support column and the machine body even when the upper support column is overloaded in the longitudinal direction of the machine body. [Structure] A connecting member 3 which is integrally provided with one of the upper strut 7 and the lower strut 8 and which connects the two strut members 7 and 8 so as to be bendable in the front-rear direction of the traveling vehicle body 1.
2, a plate member 40 that is rotatably provided so as to be superposed on the connecting member 32 and that can be fixed and released on the side of the other column 8, and is inserted through the plate member 40 and the connecting member 32. Both members 40 and 32 are integrated with each other, and when the upper strut 7 standing on the lower strut 8 is overloaded in the front-rear direction of the traveling machine body 1, the connecting member 32 and the plate member 40. Replaceable insertion member 4 that is cut by a shear load generated between
It consists of 2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to a nozzle / boom device that is attached to a liquid spray vehicle or the like for spraying liquids such as chemical liquids, liquid fertilizers, and water onto agricultural crops. The present invention relates to an improved nozzle boom device configured to bend at a substantially middle portion.

[0002]

[Prior art]

 In various orchards and the like, a liquid spraying vehicle is used in which a worker is boarded and sprays the chemical liquid.

This type of liquid spraying vehicle is generally configured as follows, for example.

First, a column (nozzle / boom) is attached to the rear part of the machine body. The machine body travels when an operator rides on the vehicle. A tank for storing liquid such as chemical liquid and water is mounted on the rear portion of the machine body.

An appropriate number of nozzles are provided on the support column toward the left and right sides in the traveling direction of the machine body. Each of these nozzles is supported by the column so that the nozzle head oscillates, and further, all the nozzles are configured to oscillate together. Then, the nozzle is interlocked and oscillated by the operation of the drive device provided in the machine body, whereby the spray liquid can be efficiently sprayed over a wide range.

In the spraying vehicle having the above configuration, in order to widen the spraying range of the spraying liquid, it is desirable that the support column is elongated and the liquid is sprayed from a higher position.

On the other hand, if the pillars are made to project upwards for a long time, there is a problem in that they obstruct the transportation of the spray truck or the storage of the spray truck in a warehouse.

[0008] Therefore, conventionally, the strut is configured to be bent forward of the machine body, and the strut is folded and stored in a warehouse. That is, the support column is divided into an upper support column and a lower support column around the middle portion thereof, and the two columns are hinged to each other.

[0009]

[Problems to be solved by the device]

 However, in the above-mentioned conventional one, when traveling between trees in an orchard with the upper support columns standing upright on the lower support columns, the upper support columns extending upwards collide with or are caught on the branches of the trees. There was something that happened.

In addition, if the user mistakenly forgets to bend the upper support column toward the front of the machine during storage in the warehouse and enters the warehouse forward, the upper support column may collide with a low warehouse entrance. Conceivable.

In the above case, the impact due to the collision between the upper strut and the branch of the tree is directly transmitted to the mounting portion between the lower strut and the airframe, and the mounting portion and each strut are damaged. There was a risk to

The present invention has been made in view of the above-mentioned circumstances, and even when the upper strut is overloaded in the longitudinal direction of the vehicle body, the mounting portion between the respective strut or the lower strut and the vehicle body is provided. It is intended to provide a nozzle / boom device having a so-called safety trip function, which is less likely to be damaged.

[0013]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, a nozzle boom device according to the present invention is provided with a lower support column attached to a traveling body, an upper support column provided at an upper end of the lower support column, and a liquid attached to the support column to spray liquid. A nozzle and a connecting member that is integrally provided with either one of the two supports to connect the two supports to each other so that they can be bent in the front-rear direction of the traveling machine body. A plate member that is movably provided and can be fixed and released on the other support side, and is inserted through this plate member and the connecting member so that both these members are integrated with each other, and they stand upright on the lower support column. In addition, when the upper column is overloaded in the front-rear direction of the traveling machine body, a replaceable insertion member that is cut by a shear load generated between the connection member and the plate member is formed. One in which the.

[0014]

[Action]

 In the nozzle boom device according to the present invention, the upper column is erected on the lower column attached to the traveling body, and the liquid is sprayed from the nozzles provided on the column.

The upper strut is erected on the lower strut as follows.

First, a connecting member is integrally provided on one of the two columns, and the two columns are connected to each other so as to be bendable. That is, the connecting member cannot always change the relative position with respect to the one column.

On the other hand, a plate member is fixedly and releasably disposed on the other support side. The plate member is rotatably provided so as to be superposed on the connecting member. However, if necessary, the plate member can be fixed to the other column side by an appropriate means so that the other column column can be fixed. The relative position cannot be changed.

Then, the plate member is integrated with the connecting member by an insertion member inserted through the plate member and the connecting member.

As described above, the above-mentioned upper strut, which is flexibly connected to the lower strut by the connecting member, is erected with respect to the lower strut via the plate member and the insertion member. Can be fixed in the state.

Here, when the fixing state of the plate member to the other support is artificially released, the fixed standing state of the upper support to the lower support is released, and the upper support is moved in the front-rear direction of the traveling machine body. Can be defeated.

On the other hand, when the upper support is overloaded in the front-back direction of the traveling machine body in a state where the upper support is erected and fixed on the lower support, the following occurs.

First, since the plate member is fixed to the other column side, the relative position of the other column does not change. Similarly, since the connecting member is integrally provided with the one support, the relative position of the one support does not change.

Therefore, when the upper support is overloaded in the front-rear direction of the traveling machine body, the connecting member and the plate member rotate relatively opposite to each other while overlapping each other. . As a result, the insertion member inserted across the connecting member and the plate member is cut by the shear load generated between the connecting member and the plate member, and the connecting member and the plate member are separated from each other. The unity relationship between them is solved. In this way, the fixed erected state of the upper strut with respect to the lower strut is released in response to the overload given to the upper strut, so that the upper strut cushions the overload in the front-back direction of the traveling body. You can freely escape to.

Therefore, even when the upper pillar is overloaded in the front-rear direction of the traveling machine body, there is little risk of damaging the mounting portion between the lower pillar and the traveling machine body and the respective pillars.

In order to return the upper strut to the upright state, a new insertion member is replaced with a new insertion member in place of the insertion member cut by the shearing load generated between the connection member and the plate member. It may be inserted over the plate member.

[0026]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 schematically shows a liquid spraying vehicle to which a nozzle / boom device according to an embodiment of the present invention is attached. In the figure, reference numeral 1 indicates a traveling body of the liquid spraying vehicle, 2 a driver's seat, and 3 a traveling device. A tank 4 is provided on the traveling body 1 in a rearward direction of the driver's seat 2. The tank 4 is for storing spray liquid such as agricultural chemicals.

A main body hitch 5 is provided at the rear portion of the traveling machine body 1, and the nozzle / boom device 6 of the present invention is directly mounted on the main body hitch 5.

As shown in FIG. 2, the nozzle / boom device 6 (a piping system for spraying liquid, which is not related to the gist of the present invention, is omitted) has an upper support column 7 and a lower support column 8 connected vertically. In addition, the upper support column 7 is bent and bent in the front-back direction of the traveling machine body 1.

The upper strut 7 and the lower strut 8 are made by joining metal members each having a U-shaped cross section, facing each other so as to form a space inside. As shown in FIG. 3, a shaft member 9 is horizontally inserted into the upper portion of the lower support column 8 with both end portions thereof projecting to the left and right sides in the traveling direction of the traveling machine body 1. . The shaft member 9 is held on the upper end of the lower support column 8 via a bearing 10 so that it can rotate freely (hereinafter, this shaft member 9 is referred to as a "connecting portion rotating shaft"). .

The right and left side surfaces of the lower end of the upper support column 7 and the upper end of the lower support column 8 are connected by connecting members 31 and 32. These connecting members 31 and 32 are fixedly attached to the upper strut 7 by appropriate fasteners 33 such as rivets, bolts and nuts, while the lower strut 8 has the connecting portion rotating shaft 9 Is connected so as to rotate in the front-rear direction of the traveling machine body 1 around the rotation axis X1.

In the illustrated embodiment, as shown in FIG. 3 which is a sectional view taken along the line III-III in FIG. 4, first, covers 34 and 35 are attached to the left and right sides of the upper portion of the lower column 8. These covers 34 and 35 cover both end portions of the connecting portion rotating shaft 9 protruding leftward and rightward from the upper end portion of the lower column 8. Circular protrusions 36 and 37 are provided on the surfaces of the covers 34 and 35, respectively. The centers of the circular protrusions 36 and 37 are located on an extension of the rotation axis X1 of the connecting portion rotation shaft 9.

In the illustrated example, connecting plates are used as the connecting members 31 and 32, and circular holes 38 and 39 that fit into the circular protrusions 36 and 37 are provided in the lower portions of the connecting plates 31 and 32. Has been. Then, after the connecting plates 31 and 32 are fitted to the covers 34 and 35 so that the circular protrusions 36 and 37 and the circular holes 38 and 39 are fitted to each other, the lid members 15 and 15 are attached from above. It is fixed to the circular protrusions 36 and 37. As a result, the connecting plates 31 and 32 are rotatable around the circular protrusions 36 and 37 in the front-rear direction of the traveling machine body 1.

As described above, the upper portions 31a and 32a of the connecting plates 31 and 32 are fixed to the left and right side surfaces of the lower end portion of the upper support column 7 by the fixing members 33.

Further, in the illustrated example, the upper support column 7 is held in an upright state during work, and the upper support column 7 standing on the lower support column 8 is moved forward and backward of the traveling body 1. The structure described below is adopted so that when an overload is applied, the impact exerted on the mounting portion between the lower support column 8 and the traveling machine body 1 and the like due to the overload can be mitigated. .

First, one of the circular protrusions 36 and 37 (in the illustrated example, the circular protrusion 37 on the right side in FIG. 3) is formed so as to protrude a little longer. . A plate member 40 is attached to the circular protrusion 37 so as to overlap the outside of the connecting plate 32. This plate member 40 has a circular hole 41 that fits with the circular protrusion 37 in the substantially central portion thereof. The circular hole 41 is fitted into the circular protrusion 37 and then the lid member 15 is inserted. Are fixed so that they can be rotated separately from the connecting plate 32 about the circular protrusion 37.

The plate member 40 is connected to the connecting plate 32 by screwing a small-diameter bolt 42 as an insertion member in the upper portion thereof. That is, screw holes 43 and 44 having the same diameter are provided in the plate member 40 and the connecting plate 32 at positions corresponding to each other (see FIG. 6), and the small diameter is extended across these screw holes 43 and 44. The bolt 42 is screwed in.

The small-diameter bolt 42 integrates the plate member 40 and the connecting member 32, and a shear load larger than a predetermined value is applied between the plate member 40 and the connecting member 32. It is called a fuse bolt or shear bolt that has the strength to be easily cut by the shearing load.

The plate member 40 can be fixed to and released from the lower column 8 by using an appropriate fixing means.

That is, in the plate member 40, in the illustrated example, the upper strut 7 is upright, and the lower edge portion 45 thereof has an arc shape with the rotation axis X1 as the center, and they are overlapped with each other. The connecting plate 32 is extended downwardly (see FIG. 3). A recess 46 is formed at the center of the arc of the lower edge 45 of the plate member 40.

On the other hand, above the lower strut 8 and below the plate member 40, a convex portion 48 that engages with the concave portion 46 formed in the lower edge portion 45 of the plate member 40 is provided at one end. A lock lever 47 is pivotally supported by a pivot shaft 49. The lock lever 47 is always urged upward by the coil spring 50 so that the convex portion 48 is engaged with the concave portion 46 of the plate member 40, and does not rotate about the circular protrusion 37 during the work. Thus, the plate member 40 is fixed to the lower column 8.

Then, the handle 51 at the lower end of the lock lever 47 is grasped, and the lock lever 51 is rotated rearward about the pivotal shaft 49 against the biasing force of the coil lever 50. The engagement between the convex portion 48 and the concave portion 46 is released, and the fixed relationship between the plate member 40 and the lower support column 8 is released.

In the figure, 52 is a guide slit formed in the lock lever 47 in an arc shape around the pivot shaft 49, and 53 is inserted into the guide slit 52 and screwed into the lower support column 8. These stopper bolts are provided for the purpose of stable rotation operation of the lock lever 47.

Further, in FIG. 1, reference numeral 54 denotes a coil spring provided between the rear part of the connecting plate 31 on the left side in FIG. 3 and the upper part of the lower support column 8. The coil spring 54 gently urges the upper strut 7 and the lower strut 8 upright so that they are in close contact with each other, preventing rattling of the upper strut 7 and tilting it forward. The force required to raise the upper strut 7 is reduced.

Further, in the illustrated example, a suitable number of shaft members 16a, 16b, 17a, 17b, 17c are provided on the upper strut 7 and the lower strut 8 at appropriate intervals between them. The columns 7 and 8 are provided so as to extend horizontally to the left and right. Both ends of these shaft members 16a, 16b, 17a, 17b, 17c project to the left and right sides of the columns 7 and 8 (see FIG. 3). The shaft members 16a, 16b, 17a, 17b, 17c are supported by the support columns 7, 8 via bearings 18, respectively, and the support columns 7, 8 are freely rotated about the axis X2. 8 (hereinafter, the shaft members 16a and 16b provided on the upper strut 7 are referred to as "upper strut cam drive shaft", and the shaft members 17a, 17b and 17c provided on the lower strut 8 are referred to as "lower strut". Cam drive shaft ").

All of the upper strut cam drive shafts 16a and 16b, the lower strut cam drive shafts 17a, 17b and 17c, and the connecting portion turning shaft 9 are turned in conjunction with each other by an appropriate transmission means. Are linked together.

That is, for example, each of the upper strut cam drive shafts 16a, 16b, the lower strut cam drive shafts 17a, 17b, 17c, and the connecting portion pivot shaft 9 has two sprockets 19 left and right. Are installed side by side. These sprockets 19 are located in the columns 7 and 8 described above. Then, the sprockets 19 mounted on the respective vertically adjacent rotating shafts are connected by an endless chain 20. As a result, if a rotational force is applied to any of the rotating shafts, all the cam drive shafts 16a, 16b, 17a, 17b, 17c and the connecting portion rotating shaft 9 will rotate together.

In the illustrated embodiment, a drive device 21 such as a motor is attached to the lower portion of the lower support column 8 so that a drive shaft 22 thereof projects into the lower support column 8, and transmission of an appropriate chain or sprocket is performed. The rotational force is appropriately decelerated and transmitted from the drive device 21 to the lowermost cam drive shaft 17c of the lower support column 8 via the means.

Eccentric cams 23 having circular cross sections are attached to both outer ends of the upper strut cam drive shafts 16a, 16b and the lower strut cam drive shafts 17a, 17b, 17c, respectively. These eccentric cams 23 have a larger outer diameter than the cam drive shafts 16a, 16b, 17a, 17b, 17c and have an appropriate thickness. A rear end portion 25a of the nozzle tube 25 is attached to each of the eccentric cams 23 via a spherical bearing 24 arranged radially outward from the axis X2 of each of the cam drive shafts 16a, 16b, 17a, 17b, 17c. Are attached respectively. As a result, when the cam drive shafts 16a, 16b, 17a, 17b, 17c rotate, the rear end portions 25a of the nozzle pipes 25 correspondingly move the cam drive shafts 16a, 16b, 17a, 17b, A circular motion centered on the axis X2 of 17c is performed.

The nozzle tubes 25 extend to the left and right sides of the machine body 1, respectively. Each nozzle tube 25 is designed to have an appropriate length so that it is not too long. If it is too long, the risk of being caught by the branches of the trees is great when the scatter vehicle travels between trees in the orchard. In order to avoid the same danger, the left and right widths of the upper support column 7 and the lower support column 8 are made as narrow as possible, and the nozzle pipes 25 held by the respective support columns 7 and 8 are prevented from protruding in the left and right directions. It is desirable to shorten it.

Each of the nozzle tubes 25 is axially supported by being sandwiched by U-shaped support members 26 in the middle of its length direction. Both ends of each nozzle tube 25 can freely swing up and down about the horizontal pivot axis fulcrum 27. The U-shaped support member 26 is attached to the tip of the bracket 28 so as to be rotatable around the vertical axis X3. The brackets 28 are attached to the left and right side surfaces of the upper strut 7 and the lower strut 8, respectively, and support the nozzle tube 25 via the U-shaped support member 26.

The spray liquid stored in the tank 4 is sent to each of the nozzle pipes 25 through a pump (not shown), and the nozzle pipes 25 are moved by applying an appropriate braking force to the swing of the nozzle pipes 25. A liquid supply hose 29 for smoothing the liquid is connected to each nozzle, and a nozzle 30 for spraying the spray liquid over a wide range is attached to the tip of each nozzle 25.

The swinging mechanism portion of each nozzle tube 25 and the bent portions of the upper strut 7 and the lower strut 8 are covered with an appropriate cover so that the spray liquid or the like sprayed by the nozzle 30 can enter. Is preferably prevented.

Next, the operation of the nozzle / boom device of this embodiment configured as described above will be described.

When performing the spraying work, the upper support column 7 releases the locking device with the machine body 1 (not shown), and then the operator supports the upper support column 7 on the lower support column 8 and assists the coil panel 54. It is made to stand up.

The connection plates 31 and 32 are integrally provided at the lower end of the upper support column 7, and the connection columns 31 and 32 connect the support columns 7 and 8 in a mutually bendable manner. Therefore, the connecting plates 31 and 32 are always incapable of changing their relative positions with respect to the upper column 7.

On the other hand, the plate member 40 is provided so as to be superposed on the connecting plate 32 and rotatable independently of the connecting plate 32 with the circular protrusion 37 as a center.

Here, the plate member 40 is integrated with the connecting plate 32 by the small-diameter bolt 42 inserted through the plate member 40 and the connecting plate 32.

Therefore, an operator supports the upper strut 7 by hand and erects it on the lower strut 8, and the lock lever 47 prevents the plate member 40 from rotating toward the lower strut 8 side. When fixed, the upper strut 7 is fixed in an upright state to the lower strut 8 via the connecting plates 31 and 32, the plate member 40 and the small diameter bolt 42 (see FIG. 4).

When the upper strut 7 is erected and the drive device 21 is operated as described above, the lower strut cam drive shaft 17c provided at the lowermost side of the lower strut 8 rotates. The rotational force of the lower strut cam drive shaft 17c is controlled by the sprocket 19 and the chain 20 so that all the rotation shafts (the lower strut cam drive shafts 17b and 17a, the connecting portion rotation shaft 9 and the upper strut cam drive shaft). 16b, 16a).

When the lower strut cam drive shafts 17a, 17b, 17c and the upper strut cam drive shafts 16a, 16b rotate, the eccentric cams 23 provided at both outer ends of the respective cam drive shafts are rotated. By the action, the rear end portion 25a of each nozzle tube 25 makes a circular motion about the axis X2 of each cam drive shaft.

Here, each of the nozzle tubes 25 is supported by each of the U-shaped support members 26 so that both ends thereof can freely swing up and down, and further, each of the U-shaped support members 26 is vertical. It is supported by the brackets 28 so as to freely rotate about the axis X3 in the direction. Therefore, when the rear end portion 25a of each nozzle tube 25 makes a circular motion, the nozzle tube 25 swings up and down about the pivot shaft 27 and the vertical movement of the U-shaped support member 26. Through the reverse rotation around the axis X3 in the direction, the tip end portions of the nozzle tubes 25, that is, the nozzles 30 also simultaneously perform the swinging motion.

In this way, each nozzle 30 swings smoothly and reliably in conjunction with each other, and the spray liquid stored in the tank 4 is sprayed over a wide area on both left and right sides in the traveling direction of the traveling machine body 1. It becomes possible to do.

By the way, in an orchard or the like, when traveling between trees with the upper support column 7 standing upright, the upper support column 7 collides with a thick branch 55 of the tree extending from the left and right sides of the traveling path. It may get caught.

In such a case, according to the nozzle / boom device of the present embodiment, a so-called safety trip function works as shown in FIG.

That is, when the upper strut 7 collides with the tree branch 55 or the like, the traveling machine body 1 is moving forward. A strong load will be applied to the rear of.

When a strong rearward load is applied to the upper strut 7, the connecting plates 31 and 32 fixed to the lower end of the upper strut 7 are also centered on the circular protrusions 36 and 37. Try to rotate backwards. On the other hand, the plate member 40, which is integrated with the connecting plate 32 and the small-diameter bolt 42, is held by the lock lever 47 so as not to be rotatable with respect to the lower strut 8 side.

For this reason, when a strong load is applied to the upper support 7 to the rear of the traveling machine body 1, a large shear load is generated between the connecting plate 32 and the plate member 40.

As a result, the small-diameter bolt 42 is cut by the shearing load, the upper strut 7 escapes to the rear of the traveling machine body 1, and the impact due to the collision with the tree branch 55 is softened. Therefore, it is possible to prevent the mounting portion between the lower support column 8 and the traveling machine body 1 and the support columns 7 and 8 from being damaged by the impact due to the collision, and the branches of the tree or the like 55 that collide with the upper support column. You can also avoid damaging the.

In order to restore the upper support column 7 after the small-diameter bolt 42 is cut, an operator stands the inclined upper support column 7 upright on the lower support column 8 and connects it to the plate member 40. The screw holes 43, 44 of the plate 32 may be aligned with each other, and a new small-diameter bolt 42 may be screwed into the screw holes 43, 44 instead of the original small-diameter bolt 42 that has been cut.

On the other hand, when the spreader vehicle equipped with the nozzle / boom device of the illustrated example is stored in a warehouse or the like, the handle 51 of the lock lever 47 is pulled rearward so that the protrusion 48 of the lock lever 47 and The engagement state of the plate member 40 with the recess 46 is released, and the fixed state of the plate member 40 with respect to the lower strut 8 side is artificially released. Then, the fixed upright state of the upper strut 7 with respect to the lower strut 8 is released, and the upper strut 7 can be pulled down by hand above the tank 4 and in front of the traveling machine body 1 (Fig. 5).

Although the upper support column 7 is configured to be tilted in the front-rear direction about the rotation axis X1 of the connecting portion rotation shaft 9, even if the upper support column 7 is tilted, It has no effect on the internal mechanism.

In this embodiment, the connecting plates 31 and 32 are fixed to the lower portion of the upper strut 7, and the plate member 40 is fixed to the lower strut 8 by a lock lever 47 provided on the lower strut 8 side. However, the connecting portion between the upper strut 7 and the lower strut 8 shown in FIG. 3 is upside down, that is, the connecting plate is placed above the lower strut. Needless to say, even if the plate member is fixed and the plate member can be fixed and released with respect to the upper strut side by the lock lever provided on the upper strut side, the same effect as described above can be obtained.

[0074]

[Effect of device]

 According to the nozzle / boom device of the present invention, when the traveling body is run with the upper support column standing upright, even if the traveling body is overloaded in the front-rear direction with respect to the upper support column, the connecting member is connected. Only the insertion member that connects the plate member and the plate member is damaged, and the overload is not directly transmitted to the mounting portion or the like between the lower strut and the traveling body. Therefore, there is little risk of damage to the main part of the device during use.

Further, in order to restore the upper support, it is only necessary to replace the damaged insertion member with a new one, and therefore there is an advantage that the repair work is easy and the cost is low.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of a liquid spraying vehicle equipped with a nozzle / boom device according to an embodiment of the present invention, as viewed from diagonally left rear.

FIG. 2 is a perspective overall perspective view showing the internal structure of the nozzle boom device shown in FIG.

FIG. 3 is a longitudinal sectional view of a main part of a nozzle / boom device (I in FIG. 4).
II-III arrow sectional view).

FIG. 4 is a perspective view of a connecting portion between an upper strut and a lower strut seen from a diagonally right rear side of the scatter vehicle.

FIG. 5 is a perspective view of a connecting portion between the upper strut and the lower strut, showing a state in which the upper strut is tilted forward of the traveling body.

FIG. 6 is a perspective view of a connecting portion between an upper strut and a lower strut, showing a state where the upper strut escapes to the rear.

[Explanation of symbols]

 1 Travel Aircraft 7 Upper Strut 8 Lower Strut 30 Nozzle 32 Connecting Member 40 Plate Member 42 Insertion Member

Claims (1)

[Scope of utility model registration request] 1. A lower strut (8) attached to a traveling body (1), an upper strut (7) provided at an upper end of the lower strut (8), and a liquid attached to the strut (7, 8). And a nozzle (30) for spraying the propeller (7) and one of the columns (7, 8) of the props (7, 8) integrally with each other so that the props (7, 8) of the traveling body (1) are provided. A connecting member (32) for bendingly connecting to each other in the front-rear direction, and a plate member (40) that is rotatably provided so as to overlap with the connecting member (32) and is fixed and releasable on the side of the other column (8). )
And the plate member (40) and the connecting member (32) are inserted so as to integrate the two members (40, 32) with each other, and the upper support column (8) standing upright on the lower support column (8). A replaceable insertion member that is cut by a shear load generated between the connecting member (32) and the plate member (40) when an overload in the front-rear direction of the traveling machine body (1) is applied to 7). (42) A nozzle / boom device comprising: