JP4865391B2 - Boom sprayer lifting device - Google Patents

Description

  The present invention relates to a boom sprayer for spraying a pest control drug or the like in a paddy field or a field crop, and more particularly to a lifting device for lifting and lowering a boom nozzle device of the boom sprayer.

  There are various types of boom sprayers for spraying medicines over a wide area. For example, the boom sprayer described in Patent Document 1 below is a type including a lifting device that lifts and lowers the boom nozzle device so that the spraying height can be adjusted according to the height of the crop.

The lifting device includes a pair of guide rails for guiding the boom nozzle device of the boom sprayer, as will be described with reference to FIGS. 1 and 2, which are explanatory views of the present invention. In addition, a pair of rollers is attached to the boom nozzle device, and the boom nozzle device can be moved up and down along the guide rail by these rollers. Usually, the roller is provided with collar portions at both ends so as not to be removed from the guide rail. Further, the tapered surface inside each collar portion is in contact with the corresponding corner portion of the guide rail having a substantially rectangular cross section.
Japanese Utility Model Application Publication No. 63-28160

  In general, a boom nozzle device in a boom sprayer is a heavy object and is often 100 kg or more. In use, the boom is extended in the lateral direction, and the angle thereof is appropriately adjusted according to the height of the crop and the inclination of the ground, so that the position of the center of gravity of the boom nozzle device varies. For this reason, a great force acts on the contact surface between the guide rail and the roller. Furthermore, when the boom sprayer moves on an uneven surface such as a farm field, vibrations and impacts are applied to the boom sprayer, so that a larger force acts on the contact surface between the guide rail and the roller. Particularly, since the corner portion of the guide rail is in a point contact state with the tapered surface of the collar portion of the roller, dents and wear are likely to occur at the corner portion of the guide rail.

  When the dents and wear generated on the guide rail become large due to long-term use, the boom nozzle device cannot be smoothly moved up and down, so it is necessary to replace the guide rail.

  However, there is a problem that exchanging the guide rail is extremely difficult. That is, the guide rail is a part of the mast frame that is the basis of the boom sprayer, and is configured as one of the main strength members of the boom sprayer. In addition, the mast frame itself is a high-strength structure, is a large welded structure and is integrated with the guide rail, and is heavy and expensive. Therefore, when exchanging the guide rail, the mast frame is also exchanged, and the exchanging work requires a huge number of work steps, which is a heavy burden on the user in terms of cost and time.

  Accordingly, an object of the present invention is to provide a novel boom sprayer lifting device capable of solving the above-mentioned problems.

  To achieve the above object, the present invention provides a guide rail (30) for guiding a boom nozzle device (14) in an elevating device (28) for raising and lowering a boom nozzle device (14) of a boom sprayer (10), A roller (32) that is attached to the boom nozzle device (14) and rolls along the guide rail (30), and a wear plate that is detachably attached to a portion of the guide rail (30) where the roller (32) contacts. (52).

  In such a configuration, the guide rail (30) does not wear or dent, and only occurs on the wear plate (52). Further, since the wear plate (52) is detachable, only the wear plate (52) can be replaced even if the wear plate (52) is worn or the like.

  Further, since the degree of wear or the like generated on the wear plate (52) varies depending on the position, it is preferable to divide the wear plate (52) into a plurality of pieces and attach them to the guide rail (30). This is because it is economical because only the wear plate (52) of the portion with much wear or the like can be replaced.

  As a means for attaching / detaching the wear plate (52), a screw (54) is preferable because it is a simple means.

  When the screw (54) is used, the roller (32) is divided into two parts (32a, 32b) along the axial direction so that the head (60) of the screw (54) does not interfere with the roller (32). A space (62) through which the head (60) of the screw (54) can pass is formed between the portions (32a, 32b).

  When the roller (32) is an integral type, a groove (64) through which the head (60) of the screw (54) can pass may be formed in the shaft (33) of the roller (32). .

  As described above, according to the present invention, the wear plate can prevent the guide rail that guides the boom nozzle device from being worn or dented.

  Further, even if wear or the like occurs on the wear plate, the wear plate can be removed, so that it is very easy to replace it. Therefore, by performing maintenance of the wear plate, it becomes possible to use the boom sprayer in a stable state over a long period of time.

  Furthermore, the cost of the wear plate itself is much lower than that of the guide rail and mast frame, which is advantageous in terms of cost.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals.

  FIG. 1 is a perspective view showing an entire boom sprayer 10 to which the present invention is applicable. The illustrated boom sprayer 10 includes a single type boom nozzle device 14 having a boom (hereinafter referred to as “side boom”) 12 only on one side. As understood from FIG. 2, the side boom 12 is attached to the tip end portion of the turn boom 18 attached to the base 16 so as to be swingable in the horizontal direction so as to be swingable in the vertical direction and the horizontal direction. In the illustrated embodiment, the side boom 12 is composed of three sub-booms, and can be expanded and contracted in a three-stage manner. A pipe 20 is attached to each sub boom of the side boom 12 (see FIG. 1), and the medicine sucked and pumped from the medicine tank 24 by the pump device 22 is jetted from the nozzle 26 of the pipe 20. .

  During work, the turn boom 18 and the side boom 12 are arranged substantially in a straight line, and the side boom 12 is extended in the right direction in FIGS. 1 and 2 for use. Further, the side boom 12 can be swung in the vertical direction according to the form of the spray surface and the height of the crop. Furthermore, it is possible to swing the turn boom 18 180 degrees horizontally as required and extend the side boom 12 to the left.

  In addition, the boom sprayer 10 of the illustrated embodiment includes a lifting device 28 that lifts and lowers the boom nozzle device 14. The lifting device 28 is basically the same as the conventional configuration, and includes a pair of guide rails 30 extending in the vertical direction, and a roller 32 for connecting the base 16 of the boom nozzle device 14 to the guide rails 30. ing. The guide rail 30 is a section steel having a substantially rectangular cross section. Similarly, the guide rail 30 is composed of another section steel 34 extending in the vertical direction and a short section steel 36 horizontally mounted so as to connect these section steels 34 to each other. A mast frame 38 serving as the basis of 10 is formed. A hydraulic cylinder 40 is disposed between the guide rails 30 and extends in the same direction as the guide rails 30. A sprocket 44 is attached to the tip of the piston rod 42 of the hydraulic cylinder 40. A chain 46 is engaged with the sprocket 44, one end of the chain 46 suspended from the sprocket 44 is fixed to the base 16, and the other end is fixed to the mast frame 38. In this configuration, when hydraulic oil is supplied to the hydraulic cylinder 40 and the piston rod 42 is raised, the base 16, that is, the boom nozzle device 14 is also raised via the chain 46. When the hydraulic oil in the hydraulic cylinder 40 is returned to the oil tank (not shown), the piston rod 42 and the boom nozzle device 14 are lowered by their own weight.

  The roller 32 is rotatably supported by a support shaft 50 attached to a bracket 48 on the base 16 of the boom nozzle device 14 as clearly shown in FIG. 2, particularly FIG. 3. Moreover, in this embodiment, the roller 32 is divided | segmented into the two parts 32a and 32b in the axial direction, and each can rotate independently independently. Each of the two divided portions 32a and 32b of the roller 32 is composed of shaft portions 33a and 33b and collar portions 35a and 35b provided integrally on the outer ends thereof. The inner surface of each collar portion 35a, 35b (the surface facing the other collar portion 35b, 35a) is processed into a taper shape. Each roller 32 is disposed outside the corresponding guide rail 30, and the tapered surfaces of the collar portions 35 a and 35 b are in contact with the corners on the outside of the guide rail 30. As a result, the guide rail 30 is sandwiched between the pair of rollers 32, and the base 16 can be moved up and down without dropping from the guide rail 30.

  Since the roller 32 is divided into two parts, when the boom nozzle device 14 is moved up and down, even if the center of gravity of the boom nozzle device 14 is largely moved in the lateral direction and the base 16 is inclined, the collar portions 35a and 35b are Since it rotates independently, rotation of each collar part 35a, 35b is not prevented. Accordingly, even in such a state, the base 16, that is, the boom nozzle device 14 can be smoothly raised and lowered.

  On the other hand, a wear plate 52 is attached to the portion of the guide rail 30 that contacts the roller 32, as shown in FIGS. The wear plate 52 has high wear resistance so as to protect the guide rail 30 from wear and dents caused by load and impact from the roller 32 and to suppress the wear and dents of the wear plate 52 as much as possible. Made from excellent rigid material. The wear plate 52 has a substantially U-shaped cross section and is attached so as to cover the outer surface of the guide rail 30 and the corner adjacent to the surface over the entire length thereof.

  With this configuration, the roller 32 is not in direct contact with the guide rail 30 but only in contact with the wear plate 52, and the guide rail 30 is suitably protected from wear and dents. Further, since the wear plate 52 itself is made of a rigid material having excellent wear resistance, the wear plate 52 is hardly worn or deformed even when used for a long period of time, and the boom nozzle device 14 can be lifted and lowered smoothly over a long period of time. Can be done.

  Various means for attaching the wear plate 52 are conceivable, but it is preferable that the wear plate 52 be removable with a screw 54. More specifically, a plurality of internal thread portions 56 are formed on the outer surface of the guide rail 30 at the center in the horizontal direction and at appropriate intervals in the vertical direction, and the through holes of the wear plate 52 are formed in the internal thread portions 56. The wear plate 52 is preferably attached by screwing the screw 54 through 58. As a result, when wear or dents are generated on the wear plate 52, the wear plate 52 can be removed from the guide rail 30 by removing the screw 54, and only the wear plate 52 can be replaced. The wear plate 52 is much cheaper than the guide rail 30 and the mast frame 38, and is attached to the guide rail 30 with only the screws 54, so that the cost and labor required for replacement are extremely small.

  Although the head 60 of the screw 54 may interfere with the roller 32, as shown in FIG. 3, the head 60 of the screw 54 passes through the space 62 between the parts 32a and 32b of the roller 32 divided into two parts. It is preferable to configure as above.

  In many cases, the boom nozzle device 14 is mainly located at the lower part of the guide rail 30, and the lower wear plate 52 is worn earlier than the upper side. Therefore, it is preferable that the wear plate 52 is divided into a plurality of parts in the vertical direction and attached to the guide rail 30. In the embodiment shown in FIG. 4, the wear plate 52 is divided into two in the vertical direction. When the lower wear plate 52 is more worn than the upper wear plate 52, only the lower wear plate 52 is used. Can be exchanged. Thereby, it becomes possible to further reduce the cost and labor required for replacing the wear plate 52. Of course, the wear plate 52 can be divided not only into two pieces but also into three or more pieces.

  As mentioned above, although preferred embodiment of this invention was described in detail, it cannot be overemphasized that this invention is not limited to the said embodiment.

  For example, the roller in the above embodiment is a two-divided type, but may be an integral type. In such a case, it is preferable to provide a groove 64 through which the head portion 60 of the screw 54 passes in the center of the shaft portion 33 of the roller 32 as shown in FIG.

  Further, the means for attaching the wear plate is not limited to screws, and the use of a blind rivet or the like that can be removed and attached from one side is also conceivable.

It is a perspective view which shows the boom sprayer which has a raising / lowering apparatus which can apply this invention. 1 is a partial view schematically showing a lifting device according to the present invention. It is an enlarged view which shows the principal part of the raising / lowering apparatus by this invention. It is a perspective view which shows the guide rail in the raising / lowering apparatus by this invention. It is a figure similar to FIG. 3 which shows another embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Boom sprayer, 14 ... Boom nozzle device, 28 ... Lifting device, 30 ... Guide rail, 32 ... Roller, 32a, 32b ... Roller part, 38 ... Mast frame, 52 ... Wear plate, 54 ... Screw, 56 ... Female Screw part, 60 ... screw head, 62 ... space, 64 ... groove.

Claims (2)

In the lifting device (28) for lifting and lowering the boom nozzle device (14) of the boom sprayer (10),
A guide rail (30) for guiding the boom nozzle device (14);
A roller (32) attached to the boom nozzle device (14) and rolling along the guide rail (30);
A lifting device for a boom sprayer, comprising a wear plate (52) removably attached to a portion of the guide rail (30) with which the roller (32) contacts ,
The wear plate (52) is detachably attached to the guide rail (30) by a screw (54),
The roller (32) includes a support shaft (50) attached to a bracket (48) provided in the boom nozzle device (14), and a first shaft rotatably supported by the support shaft (50). A portion (33a) and a second shaft portion (33b), and a collar portion (32a and 32b) integrated with the first shaft portion (33a) and the second shaft portion (33b), respectively. The collar portion (32a) of the first shaft portion (33a) is in contact with one of the corners of the wear plate (52) on the guide rail (30), and the second shaft portion ( 33b) the collar portion (32b) is in contact with the other corner of the wear plate (52) on the guide rail (14),
The roller (32) is configured such that the collar portion (32a) of the first shaft portion (33a) and the collar portion (32b) of the second shaft portion (33b) are independently rotatable. ,
The head (60) of the screw (54) is between the collar portion (32a) of the first shaft portion (33a) and the collar portion (32b) of the second shaft portion (33b). A boom sprayer lifting device characterized in that a space (62) through which it can pass is formed .   The boom sprayer lifting device according to claim 1, wherein the wear plate (52) is divided into a plurality of pieces and attached to the guide rail (30).

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