JP3642961B2 - Parts mounting means for boom sprayers - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a boom sprayer for spraying chemicals on field crops and the like, and more particularly to a component mounting means for mounting components such as a nozzle to a boom body of a boom sprayer.
[0002]
[Prior art]
Conventionally, boom sprayers have been used to spray chemicals on field crops and the like. The boom sprayer includes a tank for storing a medicine, a long boom device provided on both the left and right sides of the tank, and a number of nozzles provided downward on the boom device. The boom sprayer is mounted on the vehicle body, or these are pulled by the vehicle body, and the medicine is sprayed from the nozzle and sprayed on the crops or the like. An example of such a boom sprayer boom device is disclosed in Japanese Utility Model Publication No. 5-3251. As shown in FIG. 3 and FIG. 6 of this publication, the boom device of this example has a telescopic three-stage boom. The three-stage boom has a first-stage boom, a second-stage boom, and a third-stage boom from the proximal end side toward the distal end side, and these are provided so as to be relatively movable in the longitudinal direction. Each of the first-stage boom, the second-stage boom, and the third-stage boom is provided with a plurality of nozzle tubes that are spaced apart from each other in the longitudinal direction. The boom main body is formed with a nozzle tube mounting groove, and a nut is accommodated therein. A bolt is inserted into the nozzle tube mounting groove through an insertion hole of the nozzle tube mounting bracket, and is screwed into the nut to fix the nozzle tube to the boom body.
[0003]
[Problems to be solved by the invention]
The left and right booms of the conventional boom sprayer as described above have a length of about 15 m depending on the model, and usually about 50 nozzle portions are attached at equal intervals. When each nozzle portion is attached to the boom body with four screws, about 200 screws and nuts need to be screwed together.
In the assembly operation of the boom device as described above, the necessary number of nuts accurately counted are inserted in advance from the open end of the nozzle tube mounting groove. Next, the nut is moved one by one in the narrow nozzle tube mounting groove, and is carefully aligned with the insertion hole of the mounting bracket, and the bolt and the nut are screwed together. This operation must be repeated for a predetermined number of screws. In addition, since the nozzle portion is attached to the lower surface of the boom in a use state, an operator must be in an unnatural posture facing upward from the lower side of the boom at the time of maintenance / repair. Must be aligned with the insertion hole, and the nozzle portion must be mounted, which is extremely difficult and time consuming.
[0004]
Accordingly, an object of the present invention is to provide a component mounting means for a boom sprayer that can improve the workability of mounting the nozzle portion.
[0005]
[Means for Solving the Problems]
The above-mentioned object of the present invention is a component mounting means for a boom sprayer for mounting the component (6) with a screw in the longitudinal direction to the boom body (8), wherein the screw is a self-tapping screw (first material). 16), the boom body (8) is made of a second material, and the second material has a lower hardness than the first material, and the boom body (8) is parallel and longitudinal to each other. A component mounting groove (10) having a pair of threading opposing walls (12, 12) extending in the direction is formed, and the distance (w) between the pair of threading opposing walls (12, 12) is This can be achieved by the component mounting means for the boom sprayer, characterized in that it is smaller than the diameter (D) of the self-tapping screw (16).
[0006]
In the present invention, the component (6) is positioned at a predetermined position of the component mounting groove (10) of the boom body (8), and the self-tapping screw (16) is screwed through the component (6). Screw into the threaded opposing walls (12, 12) of the component mounting groove (10) via (14b). Then, since the second material of the boom body (8) has a lower hardness than the first material of the self-tapping screw (16), the self-tapping screw (16) causes the threading facing wall (12). , 12) are threaded with each other and screwed together to fix the component (6) to the boom body (8).
According to the present invention, the self-tapping screw (16) made of the first material can be placed at any position of the component mounting groove (10) made of the second material. Can be fixed. Further, according to the present invention, the component (6) can be fixed to the boom body (8) only by screwing the self-tapping screw (16), and no nut is required. This positioning work is also unnecessary. Therefore, the mounting operation of the component (6) becomes extremely easy, and the efficiency of the mounting operation can be greatly improved.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a cross-sectional view of a boom device according to an embodiment of the present invention, and shows a state where a nozzle portion is attached to a boom body with a self-tapping screw. FIG. 2 is an enlarged partial view of the nozzle portion shown in FIG. Further, FIG. 3 is a view similar to FIG. 1 showing a state in which the nozzle portion is attached to the boom body with bolts and nuts.
The boom sprayer itself for spraying the medicine according to the present embodiment is well-known and is not shown in the figure. And boom devices 2 provided one by one. A large number of nozzle portions 6 provided downward are attached to the bottom wall 9 of the boom body 8 of each boom device 2. The boom sprayer spreads the boom device 2 to the left and right, operates a vehicle on which the boom sprayer is mounted, and pulls the boom sprayer by the vehicle, while feeding the medicine downward from the nozzle portion 6. It is designed to be sprayed toward the etc.
[0008]
As shown in FIG. 1, each of the left and right boom devices 2 is a three-stage extendable and retractable deployment type, and the slide deployment mechanism itself of the boom device 2 is well known. Since there is no description, explanation is omitted. Each of the boom devices 2 includes a first-stage boom portion 2a, a second-stage boom portion 2b, and a third-stage boom portion 2c that are relatively movable in the longitudinal direction. Each of the boom parts 2a, 2b, 2c typically has a length of about 5 m each, so when the three boom parts 2a, 2b, 2c are extended, the total length is about 15 m. Each of the boom portions 2a, 2b, and 2c includes boom bodies 8a, 8b, and 8c made of aluminum alloy, which is a second extruded material. On the bottom walls 9, 9 of the respective boom bodies 8a, 8b of the first-stage boom portion 2a and the second-stage boom portion 2b, there are component mounting grooves 10 extending straight in the longitudinal direction over the entire length. Two are formed in parallel. Each of the component mounting grooves 10 has a pair of flat opposed threads 12 and 12 that are parallel to each other and extend straight in the longitudinal direction. The component mounting groove 10 is integrally formed when the boom bodies 8a and 8b are extruded.
[0009]
A plurality of nozzle portions 6 directed downward are attached to the lower surface of the boom body 8, and a total of about 50 left and right boom devices 2 are provided. The plurality of nozzle portions 6 are arranged at predetermined intervals along the component attachment groove 10 and are attached to the bottom wall 9 of the boom body 8 via attachment brackets 14. The lateral width w of the component mounting groove 10, that is, the distance w between the pair of threading opposing walls 12, 12 is such that a predetermined thread groove depth is obtained. The dimension h in the depth direction of the component mounting groove 10, that is, the height dimension h from the lower surface of the bottom wall 9 of the threading facing wall 12 is set to be slightly smaller than the diameter D. The length under the neck of the screw 16 (slightly smaller than L) is set. The self-tapping screw 16 is made of a first material, for example, stainless steel. Since the boom body 8 is formed of an aluminum alloy, the hardness is lower than that of stainless steel. Therefore, when the self-tapping screw 16 is screwed between the pair of threading opposing walls 12 and 12 through the insertion hole 14b of the mounting bracket 14, the internal thread 18 is thereby brought into the threading opposing wall 12. The nozzle portion 6 is fixed to the boom body 8 by being threaded and screwed together. Both ends in the longitudinal direction of the component mounting groove 10 are open.
[0010]
Further, the boom body 8 is formed so as to be continuous with the component mounting groove 10 on the back side (upper side) in the depth direction and to extend straight along the component mounting groove 10 in the longitudinal direction. The nut movement passage 20 thus formed is integrally formed. Since both ends in the longitudinal direction of the nut moving passage 20 are open, the nut 22 is inserted from the open end of the nut moving passage 20 as necessary, and the nut 22 is inserted into the nut moving passage 20 in the desired manner. It can be moved to the position of the nozzle portion 6. This is because, when the self-tapping screw 16 is repeatedly screwed into the threading opposing walls 12, 12, the threading opposing walls 12, 12 are crushed as shown in FIG. A bolt 24 having a threaded portion longer than the depth dimension h of the component mounting groove 10, that is, the height dimension h of the threading facing walls 12, 12 is used, and the screw tip 24 a is placed in the nut moving passage 20. This is because the nozzle portion 6 can be fixed by being screwed with the nut 22. As shown in FIG. 3, the cross-sectional shape of the nut moving passage 20 has a width dimension W slightly larger than the two-surface width of the nut 22 and a height dimension H slightly larger than the height of the nut 22. It is a horizontally long rectangle, and the nut 22 can move smoothly along the longitudinal direction of the component mounting groove 10. As described above, the length L under the neck of the self-tapping screw 16 is set to a length obtained by combining the height dimension h of the opposed walls 12 and 12 for threading and the thickness of the bracket 14. Therefore, as best shown in FIG. 2, in the state where the self-tapping screw 16 is screwed onto the threading opposing walls 12 and 12 with the mounting bracket 14 interposed, It terminates in the groove 10. Accordingly, the tip 17 of the self-tapping screw 16 does not protrude into the nut moving passage 20 from the component mounting groove 10 and does not hinder the movement of the nut 22.
[0011]
FIG. 4 is an exploded view of the nozzle unit 6. FIG. 5 is a diagram showing a positional relationship between a bracket for attaching the nozzle portion 6 to the boom body 8 and a component attachment groove.
As shown in FIG. 4, the nozzle portion 6 has a medicine ejection port 26 directed vertically downward at the lower end and a medicine inlet 28 at the upper end surface. 28 has a nozzle body 30 with a drug passage (not shown) extending vertically therebetween. Above the nozzle body 30, it is arranged to extend in the longitudinal direction along the boom body 8, communicates with the tank, and has a circular cross section for supplying the medicine in the tank to each of the nozzle bodies 30. The medicine supply pipe 32 is provided. The upper surface of the nozzle body 30 is formed with a half-moon-shaped recess 30a that receives the lower half of the drug supply pipe 32, and the inlet 28 opens on the top surface of the half-moon-shaped recess 30a. The medicine supply pipe 32 has a plurality of medicine discharge ports 34 aligned with the inflow port 28 of the nozzle body 30 on the lower surface thereof. The nozzle unit 6 further includes a tube holder 36 having a semilunar curved portion 36 a that receives the upper half of the drug supply tube 32, and the drug supply tube 32 is formed in the half-moon shape of the nozzle body 30. It is sandwiched between the concave portion 30a and the half-moon shaped curved portion 36a of the tube holder 36. Above the tube holder 36, the mounting bracket 14 having a substantially square plate shape is disposed in the horizontal direction. The bracket 14 is formed with two through holes 14a and 14a. Further, through holes 14b are formed in the four corners of the bracket 14, respectively. As can be seen from FIG. 5, two adjacent through holes 14 b and 14 b are arranged in a line and aligned with each of the component mounting grooves 10.
[0012]
The nozzle portion 6 according to the present embodiment is assembled as follows. First, the nozzle body 30 is positioned so that the inlet 28 is aligned with the discharge port 34 of the medicine supply pipe 32. Next, as shown in FIG. 4, the tube holder 36 and the bracket 14 are positioned from above the medicine supply tube 32. By screwing two countersunk screws 40 from above the bracket 14 into a female screw 30b formed on the upper surface of the nozzle body 30 through the through hole 14a, the medicine supply pipe 32 is connected to the nozzle body. 30 is fixed. Since the countersunk screw 40 is used, the upper surface of the head is flush with the upper surface of the bracket 14 when screwed. Therefore, as shown in FIG. 5, the upper surface of the bracket 14 can be brought into contact with the lower surface of the bottom wall 9 of the boom body 8 without a gap. In this way, a predetermined number of the nozzle bodies 30 are attached to the medicine supply pipe 32.
[0013]
Next, as shown in FIG. 5, the brackets 14 are positioned so that the through holes 14b are aligned with the component mounting grooves 10, respectively. Next, as shown in FIG. 4, the self-tapping screw 16 is inserted into the four through holes 14 b of the bracket 14 from below, and further screwed between the pair of threading opposing walls 12, 12. Then, the female screw 18 is threaded against the threading facing walls 12 and 12 made of aluminum alloy by the male screw of the self-tapping screw 16 made of stainless steel and fixed to each other. This operation is repeated for all the nozzle portions 6, and the nozzle portions 6 are attached to the boom body 8.
When the nozzle body 30 needs to be replaced due to subsequent maintenance inspections, etc., the self-capping screw 16 is removed, and if necessary, the adjacent nozzle portion 6 is also removed, and the countersunk screw 40 is removed. Make it removable. The countersunk screw 40 is removed, the bracket 14 is removed, and the nozzle body 30 is replaced. The new nozzle body 30 is fixed to the bracket 14 according to the reverse process. Next, the through hole 14b of the bracket 14 is aligned with the component mounting groove 10, and the self-tapping screw 16 is screwed onto the already formed female screw 18 and fixed.
[0014]
Even if the self-tapping screw 16 cannot be screwed again because the female screw 18 of the opposing wall for threading 12 or 12 is crushed due to repeated screwing, it is fixed as follows. Can do. The inflow port 28 of the nozzle body 30 and the discharge port 34 of the medicine supply pipe 32 are slightly displaced in the axial direction and repositioned within a range in which they communicate with each other. At this position, the tube holder 36 and the bracket 14 are fixed by the countersunk screws 40. If it does in this way, the said through-hole 14b of the said bracket 14 will shift | deviate to an axial direction from the position where the thread crushing occurred along the longitudinal direction of the said groove 10 for component attachment. Accordingly, the self-tapping screw 16 can be screwed between the threading opposing walls 12 and 12 that have not yet been threaded, and can be securely fixed to the boom body 8. Moreover, the nozzle part 6 can be fixed as follows also in the position where the thread crushing occurred in the opposing walls 12 and 12 for threading. The nut 22 is inserted from the open end of the nut moving passage 20 and moved in the axial direction in the nut moving passage 20 to be positioned at a predetermined bolt screwing position. Next, using the bolt 24 having a thread portion longer than the depth dimension h of the component mounting groove 10, the thread between the threading opposing walls 12, 12 through the through hole 14 b of the bracket 14. It is inserted into the female screw 18 that has been crushed, and is further screwed into the nut 22 in the nut moving passage 20.
[0015]
According to the present embodiment, the depth dimension h of the component mounting groove 10 is substantially the same as the length dimension of the self-tapping screw 16. Therefore, for example, when it is necessary to replace only the specific nozzle body 30 located in the middle position in the longitudinal direction, the nut 22 is not self-tapping without removing the self-tapping screw 16 to which the other nozzle body 30 is attached. The inside of the nut moving passage 20 can be moved to the position of the specific nozzle body 30 without being blocked by the tip 17 of the screw 16 and can be fixed by the bolt 24.
In addition, according to the present embodiment, since the nut moving passage 20 is formed on the back side of the component mounting groove 10, the threading opposing walls 12 and 12 are crushed. Even when it is desired to fix the nozzle portion 6 to the boom body 8 with the nut 22 and the bolt 24, the nut 22 can be attached to the boom body without having to remove the self-tapping screw 16 already attached. 8 can be moved to any position in the longitudinal direction.
[0016]
Furthermore, according to the present embodiment, the boom body 8 is formed of a metal material (aluminum alloy) having a hardness lower than that of the metal material (stainless steel) of the self-tapping screw 16, and the boom body 8 Since the self-tapping screws 16 are provided with threading facing walls 12 and 12 spaced apart from each other by a distance smaller than the diameter D of the self-tapping screw 16, the self-tapping screw 16 can be easily screwed into the metal boom body 8. it can. Further, the nozzle portion 6 can be fixed to the boom body 8 simply by screwing the self-tapping screw 16 between the threading opposing walls 12 and 12. Accordingly, the positioning work is reduced even when it is necessary to work upwards during maintenance inspections, etc., so that the replacement mounting work is facilitated and the working time can be shortened.
[0017]
Conventionally, a significant number of fixing nuts have been required. However, according to the present embodiment, since these nuts are not required at all, it is possible to reduce the weight of the boom and to prevent the long boom from being bent. Can be prevented.
Further, according to the present embodiment, since the threading facing walls 12 and 12 extend straight over the entire length in the longitudinal direction of the boom body 8, positioning of the screw insertion hole in the longitudinal direction is not necessary. The workability can be improved. Furthermore, the screw can be attached at any position in the longitudinal direction, and when the crushing of the thread occurs, it can be re-screwed to the position close to the original position in the longitudinal direction.
Furthermore, according to the present embodiment, the length under the neck of the self-tapping screw is set to a length that combines the thickness of the bracket 14 and the height of the opposing wall 12 for threading. Even if a component such as the bracket 14 is interposed between the head of the self-tapping screw and the boom body 8, a sufficient screwing length can be secured and the member can be firmly fixed.
[0018]
Furthermore, according to the present embodiment, since the component mounting groove 10 and the nut moving passage 20 extend straight in the longitudinal direction over the entire length, the boom body 8 can be easily and integrally formed by extrusion molding. can do.
The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the invention described in the claims, and these are also included in the scope of the present invention. Needless to say.
In the present embodiment, the boom body 8 is made of an aluminum alloy, and the self-tapping screw 16 is made of stainless steel. However, the boom body 8 and the self-tapping screw 16 do not need to be made of these metal materials, and the material of the boom body 8 is relatively harder than the material of the self-tapping screw 16. What is necessary is just to select so that it may become low.
[0019]
In the present embodiment, the threading opposing wall 12 extends straight in the longitudinal direction of the boom body 8 over the entire length. However, the threading opposing wall 12 does not necessarily extend over the entire length in the longitudinal direction of the boom body 8. For example, the lateral interval w between the pair of threading opposing walls 12, 12 is the self-mounting wall. It may be a long hole set slightly smaller than the diameter D of the tapping screw 16.
Further, in the present embodiment, the nut moving passage 20 is formed on the back side of the component mounting groove 10, which is useful when the crushing of the thread occurs, but the nut moving passage 20 is provided. That is not essential.
[0020]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the component attachment means for boom sprayers which can aim at the improvement of workability | operativity of attachment of components, such as a nozzle part, can be provided.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a boom device according to an embodiment, showing a state in which a nozzle portion is attached to a boom body with a self-tapping screw.
FIG. 2 is an enlarged partial view of a nozzle portion shown in FIG.
FIG. 3 is a view similar to FIG. 1, showing a state where the nozzle portion is attached to the boom body with bolts and nuts.
FIG. 4 is an exploded perspective view of the nozzle unit.
FIG. 5 is a diagram showing a positional relationship between a bracket for attaching the nozzle portion to the boom body and a component attachment groove.
[Explanation of symbols]
6 Parts (nozzle part)
8 Boom body 10 Component mounting groove 12 Threading opposing wall 16 Self-tapping screw 20 Nut movement passage w Distance between threading opposing walls D Self-tapping screw diameter L Self-tapping screw neck length h Threading opposing wall Height dimension

Claims (1)

Boom sprayer component mounting means for mounting the component (6) with screws (16) in the longitudinal direction with respect to the boom body (8),
The screw is a self-tapping screw (16) made of a first material, the boom body (8) is formed of a second material, and the second material has a lower hardness than the first material. The boom body (8) is formed with a part mounting groove (10) having a pair of threading opposing walls (12, 12) extending in parallel and in the longitudinal direction, and the pair of threading opposing walls ( 12, 12) is smaller than the diameter (D) of the self-tapping screw (16), and the self-tapping screw (16) terminates in the component mounting groove (10). Furthermore, a nut movement passage (in the boom main body (8)) that is connected to the component mounting groove (10) on the rear side in the depth direction and extends along the component mounting groove (10). Boom spray characterized by having 20) Component mounting means for ya.

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