JP6408951B2 - Boom vibration suppressing device and boom sprayer provided with the same - Google Patents

Description

  The present invention relates to a boom vibration suppressing device that is mounted on a boom sprayer having a side boom that is pivotally supported at the left and right positions of a center frame, and that suppresses vibration in the traveling direction of the side boom, and a boom sprayer including the same. .

  The boom sprayer is installed in a traveling vehicle such as a tractor and sprays liquids such as chemicals and liquid fertilizers on a farm field. In such a boom sprayer, it is preferable to increase the length of the boom because the chemical solution can be sprayed over a wide range in one operation. However, if the side boom is lengthened, the side boom is liable to interfere with the ground, crops, banks, utility poles, etc., and the risk of the side boom being damaged increases.

  Therefore, the conventional boom sprayer uses a spring material to support the side boom, and when the side boom interferes with the ground or the like and receives an excessive force, the side boom or the like is not damaged. Is provided with a so-called relief mechanism for releasing the interference force.

  In addition, long side booms may vibrate in the direction of travel when starting, stopping, accelerating or decelerating, climbing over uneven surfaces or turning, etc. There is. However, such vibration cannot be suppressed by the damping effect of the spring material that supports the side boom as described above.

  Therefore, an invention relating to a boom support device for suppressing vibration of the side boom has been proposed. For example, Japanese Patent Application Laid-Open No. 2014-236704 discloses a boom support device that suppresses vibrations of a side boom that is cantilevered by a work vehicle, and biases the side boom in a direction to rotate the vertical boom. There has been proposed a boom support device comprising: a biasing means; and a fluid pressure cylinder that imparts a reaction force to the side boom to which an external force against the biasing force of the biasing means is applied (Patent Document 1). ). According to Patent Document 1, by providing a damping valve, an oil damper, and a relief valve in the fluid pressure cylinder, vibration can be suppressed and the boom can be moved backward to escape. It is said that the boom can be prevented from being damaged.

JP 2014-236704 A

  However, the invention described in Patent Document 1 has a problem that the general fluid pressure cylinder has a large number of parts, and the fluid pressure cylinder having a relief valve is very expensive. Further, since each component plays an important role in the fluid pressure cylinder, it is necessary to maintain a mutual balance, and there is a problem that maintenance such as adjustment of hydraulic pressure and replacement of packing is complicated and difficult. Therefore, the invention has not been put into practical use or popularized.

  The present invention has been made in order to solve such problems, and has a structure that can be manufactured easily and inexpensively at the time of starting, stopping, accelerating and decelerating, overcoming uneven surfaces, and turning. To provide a boom vibration suppressing device and a boom sprayer equipped with the boom vibration suppressing device that can reduce the generated vibration of the boom in the traveling direction by a high damping effect and protect the boom from destruction even when an excessive external force is applied. It is aimed.

  A boom vibration suppressing device according to the present invention is mounted on a boom sprayer having a center frame installed in a traveling vehicle and a side boom pivotally supported at the left and right positions of the center frame, and suppresses vibration in the traveling direction of the side boom. And a first link member having one end pivotally supported by the side boom and a first end pivotally supported by the other end of the first link member. A second link member, a third link member that pivotally supports the second link member and pivotally supports the center frame, and the third link member and the center. And a buffer means provided between the frame and the frame.

  Further, as one aspect of the present invention, the buffer means includes a flat buffer frame suspended from the third link member, and a plate buffer material sandwiched from both side surfaces of the buffer frame, The buffer frame and the plate-shaped buffer material may be integrally connected and connected to the center frame.

  Furthermore, as one aspect of the present invention, there is provided a link material return means for applying an elastic force and returning the first link material and the second link material to an initial position when the first link material and the second link material fluctuate due to the action of the relief mechanism. It may be connected to a two-link material.

  Furthermore, the link material return means is made of a coiled spring material, one end of which is hooked on the third link material, and the other end of the second link material is the first link material. You may be latched by the elastic force adjustment volt | bolt fastened and fixed to the edge part on the opposite side to a shaft support part.

  Further, as one aspect of the present invention, the first link material and the second link material are configured by pressing a shaft supporting portion connecting the first link material and the second link material from the side. There may be provided a bending angle adjusting means for adjusting the bending angle.

  Furthermore, as an aspect of the present invention, the first link member may include an expansion / contraction mechanism that can change the length in the axial direction.

  In addition, a boom sprayer according to the present invention includes a center frame installed in a traveling vehicle, a pair of side booms pivotally supported at the left and right positions of the center frame, and the center frame and the side boom. A plurality of spray nozzles for spraying; a liquid storage tank for storing the liquid; and a liquid supply means for supplying the liquid from the liquid storage tank to the spray nozzles. Installed on each boom.

  According to the present invention, the structure that can be manufactured easily and inexpensively reduces the vibration of the boom in the traveling direction that occurs when starting and stopping, accelerating and decelerating, climbing over uneven surfaces, turning, etc., with a high damping effect, Even when an excessive external force is applied, the boom can be protected from destruction.

It is a perspective view which shows the state which installed one embodiment of the boom sprayer which concerns on this invention in the traveling vehicle. It is a top view which shows the state which extended the side boom in the boom sprayer of this embodiment to the horizontal direction. It is a front view which shows the state which expanded the side boom in the boom sprayer of this embodiment to the horizontal direction. It is an assembly drawing of the center frame, side boom, and boom vibration suppression device in the present embodiment. It is an enlarged plan view which shows the boom vibration suppression apparatus of this embodiment. It is a top view which shows the state which the boom vibration suppression apparatus of this embodiment made the relief mechanism act. It is a top view which shows the state by which the vibration suppression by the boom vibration suppression apparatus of this embodiment is suppressed. In Example 1, it is the attenuation | damping condition comparison graph by the vibration measurement of the side boom of the conventional boom sprayer and the boom sprayer which concerns on this invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of a boom vibration suppressing device and a boom sprayer having the same according to the present invention will be described with reference to the drawings.

  As shown in FIGS. 1 to 3, the boom sprayer 1 according to the present embodiment includes a center frame 2 of the boom sprayer 1 that is directly mounted on or pulled by the tractor, and a pair of shafts that are pivotally supported at the left and right positions of the center frame 2. Side booms 3, 3, a plurality of spray nozzles 4 disposed on the center frame 2 and the side booms 3, 3 for spraying liquid, a liquid storage tank 5 for storing the liquid, and the liquid storage tank 5 Liquid supply means 6 for supplying the liquid to the spray nozzles 4 and a boom vibration suppression device 7 for suppressing vibration of the side booms 3 and 3 are provided.

  The center frame 2 is made of a frame structure made of a metal plate, a metal tube, or the like, and side booms 3 and 3 are pivotally supported at the left and right positions thereof.

  The side boom 3 is a long member in which a plurality of spray nozzles 4, 4... Are arranged, and has a boom main body 31 and an attachment member 32 provided at a base end portion of the boom main body 31. ing. The boom body 31 is connected to the center frame 2 so as to be rotatable in the horizontal direction by the mounting member 32, and opens and closes between a storage position as shown in FIG. 1 and a spraying position as shown in FIG. It has come to be. For this reason, the side boom 3 can be appropriately folded at the time of movement and storage.

  More specifically, the boom main body 31 includes a mechanism that can extend and contract by sliding approximately half of the distal end side in the axial direction. Further, the boom body 31 is pivotally supported with respect to the mounting member 32 so as to be rotatable in the vertical direction, and is provided with a hydraulic cylinder 33 whose length in the axial direction can be varied, as shown in FIG. It is designed to rotate in the direction of the arrow. Further, the mounting member 32 is pivotally supported by the vertical shaft to the left and right positions of the center frame 2 and is folded forward through the mounting member 32 as shown in FIG.

  Next, the spray nozzle 4 sprays various liquids such as chemicals such as agricultural chemicals and liquids such as liquid fertilizer, which are pumped by the liquid supply means 5 described later, in liquid, drop-like or mist-like form. The spray nozzles 4 in the present embodiment are disposed at substantially equal intervals on the center frame 2 and the side boom 3 as shown in FIG. The spray nozzle 4 is not particularly limited, and may be appropriately selected depending on the type of liquid, the crop to be sprayed, and the like.

  The liquid storage tank 5 is a tank for storing liquid to be supplied to the spray nozzles 4, 4. The liquid storage tank 5 in the present embodiment is formed of a synthetic resin made of polyethylene or the like, or a steel plate such as stainless steel, and is installed on the rear side of the traveling vehicle 8. The installation location of the liquid storage tank 5 is not particularly limited, and may be installed at any location of the traveling vehicle 8.

  The liquid supply means 6 is for pumping the chemical liquid from the liquid chemical liquid storage tank 5 to the spray nozzles 4, 4..., And includes a liquid supply pump (not shown) and the liquid supply pump and the spray nozzles 4. 4... Are connected so as to be able to flow.

  Next, the boom vibration suppression device 7 of the present embodiment will be described. As shown in FIGS. 4 and 5, the boom vibration suppressing device 7 according to the present embodiment includes a first link member 71 pivotally supported on the side boom 3, and other than the first link member 71. A second link member 72 pivotally supported at the end, a third link member 73 pivotally supporting the second link member 72, the third link member 73 and the center frame 2, a buffer member 74 provided between the first link member 71, the link member return unit 75 for returning the link members 71, 72, 73 to their initial positions, the first link member 71, and the second link member 72. Bending angle adjusting means 76 for adjusting the bending angle θ.

  The first link member 71 is pivotally supported by the side boom 3 and is made of a long member as shown in FIGS. 4 to 7, and has one end portion of the side boom 3. It is pivotally supported by the mounting member 32 at the base end. Further, the first link member 71 in the present embodiment includes an expansion / contraction mechanism that can change the length in the axial direction so that the side boom 3 can be folded in the front-rear direction. The expansion / contraction mechanism is not particularly limited, and may be manually operated, and various drive means such as a slide type electric motor, an electric cylinder, a fluid pressure motor, or a fluid pressure cylinder may be used.

  The second link member 72 mainly functions as a so-called relief mechanism together with the first link member 71 so as not to be damaged when a load more than a setting is applied to the side boom 3. As shown in FIG. 4, the second link member 72 in the present embodiment is composed of two vertically elongated plate members, and two small-diameter cylindrical members that are sandwiched between these plate members and maintain the distance therebetween. It is configured. The cylinder member functions also as a shaft hole when pivotally supported by the first link member 71 and the third link member 73. In this embodiment, when the second link member is bent with respect to the first link member 71, as shown in FIG. In other words, the front end position of the side boom 3 can be bent about 5.1 m on the rear side and about 1.4 m on the center frame 2 side. It has become. In addition, the angle at which the side boom 3 is bent by the relief mechanism is not particularly limited, and may be appropriately selected from angles at which interference with the ground or the like can be received.

  As shown in FIGS. 4 to 7, the third link member 73 is formed in a pair of broad plate-like bodies that are vertically symmetrical, and a cylindrical member is disposed at a pivotal support position between these plate-like members. Yes. The third link member 73 pivotally supports one end of the second link member 72 and is pivotable with respect to the center frame 2 so as to be able to vibrate with the second link member 72. It is supported. Further, a link material returning means 75 and a bending angle adjusting means 76, which will be described later, are provided between the respective plate materials.

  Next, the buffer means 74 suppresses the vibration in the traveling direction of the side boom 3 by suppressing the vibration of the third link member 72. As shown in FIGS. 5 to 7, the buffer means 74 in the present embodiment is narrow from the flat buffer frame 741 suspended from the third link member 73 and from both side surfaces of the buffer frame 741. It has plate-like cushioning materials 742 and 742 to be held, and a coupling tool 743 that integrally couples the cushioning frame 741 and the plate-like cushioning materials 742 and 742 and fixes them to the center frame 2.

  The buffer frame 741 is suspended between the upper and lower flat plate bodies of the third link member 73 and has an insertion hole (not shown) through which the fastener 743 is inserted at the approximate center thereof.

  The plate-shaped cushioning material 742 absorbs vibration transmitted to the third link material 72 by holding the cushioning frame from both side surfaces, and is provided with an insertion hole 744 through which a fastener 743 is inserted. ing. In this embodiment, it is constituted by a plurality of disc-shaped rubber plates, a protective cap for protecting the rubber plates, and the like. In addition, the shape of the plate-shaped buffer material 742 is not limited to a disk shape, and may be appropriately selected from a polygonal shape or the like.

  The fastener 743 includes bolts and nuts, and is integrally connected to the center frame 2 in a state where a plate-shaped cushioning material 742 is sandwiched between the cushioning frame 741. At this time, since the pressure applied in advance can be adjusted by adjusting the fastening force of the fastener 743, the damping force of vibration by the plate-like cushioning material 742 can be adjusted.

  The buffer means 74 is not limited to one using a rubber plate or the like, but various materials and various devices having damping force and elasticity, for example, synthetic resins such as vinyl chloride and polyethylene, or those resins You may select suitably from a foaming material, a polymer gel, a fluid pressure cylinder, a pressure accumulator, a shock absorber for damping, etc., and a combination of them and a spring material.

  The link material return means 75 gives an elastic force when the first link material 71 and the second link material 72 are changed by the action of the relief mechanism comprising the first link material 71 and the second link material 72. In addition to returning to the initial position, the relief mechanism together with the bending angle adjusting means 76 described later is put in a tension state. The link material return means 75 in the present embodiment is made of a coiled spring material, and one end portion is hooked on the third link material 73 and the other end portion is hooked on the elastic force adjusting bolt 78. Yes. The elastic force adjusting bolt 78 is fastened and fixed to an end portion of the second link material 72 opposite to the shaft support portion 77 with the first link material 71. Therefore, the elastic force adjusting bolt 78 adjusts the fastening position, thereby releasing the relief mechanism from the tensioned state, the relief starting force that the relief mechanism acts, and the link members 71, 72, The relief returning force for returning 73 to the initial position can be adjusted.

  The bending angle adjusting means 76 is for setting the relief starting force on which the relief mechanism acts together with the elastic force adjusting bolt 78, and connects the first link member 71 and the second link member 72. The bending angle θ formed by the first link material 71 and the second link material 72 is adjusted by pressing the shaft support portion 77 from the side. That is, when the bending angle θ at the initial position is approximately 180 °, the axial directions of the first link member 71 and the second link member 72 are not aligned and difficult to bend, whereas the bending angle θ is As the angle becomes larger than 180 °, an angle is formed between the first link material 71 and the second link material 72 and the bending becomes easier.

  As shown in FIG. 4, the bending angle adjusting means 76 in the present embodiment includes a bolt screwing portion 761 provided in the third link member 73 and an adjusting bolt 762 screwed into the bolt screwing portion 761. The bending angle θ formed by the second link material 72 and the first link material 71 can be adjusted by pressing the shaft support portion 77 from the side by the tip of the adjustment bolt 762. . In the present embodiment, the relief mechanism is adjusted so that the relief mechanism acts when a load is applied such that the side boom 3 is bent backward by 3 ° or more as the relief starting force. In addition, the relief starting force which a relief mechanism acts is not specifically limited, You may select suitably according to the objects to interfere, such as the length and intensity | strength of the side boom 3, and the shape of a farm field.

  Next, the operation of each configuration of the boom vibration suppression device 7 and the boom sprayer 1 according to the present embodiment will be described.

  In the first link member 71 in the present embodiment, the side boom 3 can be folded forward as shown in FIG. 1 by extending the length in the axial direction and shortening the length in the axial direction. Thus, as shown in FIGS. 2 and 3, the side boom 3 can be expanded in the lateral direction. When spraying liquid on a farm field or the like, the side boom 3 is expanded in the lateral direction, and the liquid stored in the liquid storage tank 5 by the liquid supply means 6 is discharged from the spray nozzles 4, 4,. Scatter.

  The liquid spraying on the farm field or the like is performed while traveling by the traveling vehicle 8 so as not to be double sprayed. At this time, the side boom 3 may interfere with the ground or a crop, or may interfere with a bank or a utility pole, and a large load may be applied. In such a case, the relief mechanism of the boom vibration suppression device acts. Specifically, it is as follows.

  First, the side boom 3 receives a load due to interference with the ground, for example, and tries to rotate it in the direction opposite to the traveling direction (the arrow direction in FIG. 2). At this time, as shown in FIG. 6, the first link member 71 pivotally supported by the mounting member 32 is pushed in the axial direction, and the second link member 72 and the third link member 73 are pressed. Although the third link member 73 is rotatable with respect to the center frame 2, the range of rotation by the buffer means 74 is limited. Therefore, the pressure received by the third link member 73 is transmitted to the second link member 72 as a reaction force.

  Here, the shaft support portion 77 of the first link member 71 and the second link member 72 can be varied with respect to the side opposite to the side where the bending angle adjusting means 76 is installed. For this reason, the load between the first link member 71 and the second link member 72 is equal to or greater than the relief starting force adjusted by the bending angle adjusting means 76 and the elastic force adjusting bolt 78. When a load such that 3 is bent backward by 3 ° or more is applied, the shaft support 77 can be bent in a variable direction, and can be bent at about 30 ° at the maximum. Thereby, since the load concerning the side boom 3 etc. can be poured away, it can protect from damage.

  Further, in the link material returning means 75, the spring material 75 connected to the second link material 72 is pulled and elastic by bending the shaft support portion 77 between the first link material 71 and the second link material 72. Relief return force by force is generated. The relief returning force is applied so that the second link member 72 is returned to the initial position. Therefore, when the interference load is released from the side boom 3, the second link member 72 is returned to the initial position. The side boom 3 is also automatically returned to the initial position.

  Next, the vibration suppressing action of the boom vibration suppressing device 7 will be described. When the traveling vehicle 8 starts and stops, accelerates and decelerates, climbs over the uneven surface, and turns, the side boom 3 is spread laterally and is in a cantilever state. Vibrates in the direction of travel.

  When the side boom 3 vibrates in the traveling direction, the vibration is transmitted to the first link member 71 via the attachment member 32. In this embodiment, when the first link material 71 and the second link material 72 are in the initial positions, the bending angle θ is about 180 °, and the first link material 71 is vibrated in the axial direction. 72. In the present embodiment, when the vibration by the side boom 3 is ± 3 ° or less, the first link material 71 and the second link material 72 are adjusted so as not to be bent, and thus transmitted to the second link material 72. The generated vibration is transmitted to the third link member 73. And the 3rd link material 73 vibrates centering on the axial support part with the center frame 2. As shown in FIG.

  The buffer means 74 absorbs and suppresses the vibration of the third link member 73. Specifically, the vibration of the third link member 73 is transmitted to the shock absorbing frame 741, and the plate-like shock absorbing material 742 sandwiching the shock absorbing frame 741 absorbs the vibration of the shock absorbing frame 741. The vibration suppressing force of the third link member 73 by the buffer means 74 is transmitted to the side boom 3 via the second link member 72 and the first link member 71, and the vibration of the side boom 3 is suppressed.

According to the boom vibration suppressing device 7 of the present embodiment as described above and the boom sprayer 1 including the same, the following effects can be obtained.
1. The vibration of the side boom 3 is suppressed, and dispersion unevenness due to double spraying or the like can be suppressed.
2. By adopting a cushioning material such as rubber with a simple structure, it can be manufactured at low cost without worrying about failure.
3. The damping force of vibration can be easily adjusted by adjusting the fastening pressure with the fastener 743 of the buffer means 74.
4). When a large load is applied to the side boom 3, the relief function is exhibited by the link mechanism of the first link material 71 and the second link material 72, so that the side boom 3 and the like can be protected from damage. it can.
5. The relief starting force can be easily adjusted by adjusting the elastic force of the link material return means 75 and the bending angle θ between the first link material 71 and the second link material 72.
6). After the relief function is activated, the side boom 3 is automatically returned to the initial position by the relief return force of the link member return means 75, so that the spraying operation can be continued.

  In the first embodiment, a comparative study by experiment is performed on the vibration suppression effect between a conventional boom sprayer and a boom sprayer including the boom vibration suppression device according to the present invention (hereinafter referred to as “the boom sprayer according to the present invention”). went.

  The conventional boom sprayer used in this experiment does not include a boom vibration suppression device. On the other hand, the boom sprayer according to the present invention used in this experiment is one in which a boom vibration suppression device is installed at a connecting portion between the center frame and the side boom, as in the above-described embodiment.

  In this experiment, artificial vibration was generated on the side boom of each boom sprayer, and the amplitude of the side boom and the acceleration at the tip of the side boom were measured.

  FIG. 8 is a graph showing the amplitude of the side boom in time series. As shown in FIG. 8, both the conventional boom sprayer and the boom sprayer according to the present invention vibrate with a large amplitude immediately after the vibration is applied, and attenuate with time.

  Here, for comparison of the attenuation effect, the time until the amplitude was attenuated to 10% or less of the initial value was measured. As a result, as shown in FIG. 8, in the conventional boom sprayer, the amplitude was reduced to 10% or less about 19 seconds after the amplitude was given. On the other hand, in the boom sprayer according to the present invention, the amplitude was reduced to 10% or less after about 11 seconds, and the decay time was almost halved compared to the conventional boom sprayer.

  The acceleration at the tip of the boom was about ± 3.0 G in the conventional boom sprayer, but about ± 1.5 G in the boom sprayer according to the present invention, and this value was also halved.

  From the above, it has been shown that the boom vibration suppressing device according to the present invention and the boom sprayer provided with the same can reduce the attenuation time and amplitude substantially by half as compared with the conventional boom sprayer.

  The boom vibration suppressing device and the boom sprayer provided with the same according to the present invention are not limited to the above-described embodiments, and can be changed as appropriate.

  For example, a pressure accumulator that absorbs vibration in the vertical direction is provided in parallel with the hydraulic cylinder 33 of the side boom 3, or the center frame 2 is attached to the traveling vehicle 8 or the like as described in Japanese Patent Application Laid-Open No. 2012-100520. On the other hand, not only the vibration in the traveling direction but also the vibration in the vertical direction of the side boom 3 and the vibration in the roll direction of the center frame 2 may be suppressed by supporting the swinging freely.

DESCRIPTION OF SYMBOLS 1 Boom sprayer 2 Center frame 3 Side boom 4 Spray nozzle 5 Liquid storage tank 6 Liquid supply means 7 Boom vibration suppression device 8 Traveling vehicle 31 Boom main body 32 Mounting member 33 Hydraulic cylinder 71 First link material 72 Second link material 73 Third Link material 74 Buffer means 75 Link material return means (spring material)
76 Bending angle adjusting means 77 Shaft supporting portion 78 Elastic force adjusting bolt 741 Shock absorbing frame 742 Plate-like cushioning material 743 Connecting tool 744 Insertion hole 761 Bolt screwing portion 762 Adjustment bolt

Claims (7)

A boom vibration suppressing device that is mounted on a boom sprayer having a center frame installed in a traveling vehicle and a side boom that is pivotally supported at the left and right positions of the center frame, and that suppresses vibration in the traveling direction of the side boom,
A first link member whose one end is pivotally supported by the side boom;
A second link member, one end of which is pivotally supported by the other end of the first link member;
A third link member that pivotally supports the second link member and is pivotally supported by the center frame;
The boom vibration suppressing device, comprising: a buffer means provided between the third link member and the center frame.   The buffer means includes a flat buffer frame suspended from the third link member, a plate buffer material sandwiched from both side surfaces of the buffer frame, and the buffer frame and the plate buffer material. The boom vibration suppression device according to claim 1, further comprising: a connecting tool that integrally connects the two to each other and fixes the center frame to the center frame.   When the first link material and the second link material are moved by the action of the relief mechanism, a link material returning means for applying an elastic force and returning to the initial position is connected to the second link material, The boom vibration suppression device according to claim 1 or 2.   The link material return means is made of a coiled spring material, one end of which is hooked to the third link material, and the other end is a shaft support portion with the first link material in the second link material; The boom vibration suppressing device according to claim 3, wherein the boom vibration suppressing device is hooked on an elastic force adjusting bolt fastened and fixed to an opposite end portion.   A bending angle for adjusting a bending angle formed by the first link material and the second link material by pressing a shaft supporting portion connecting the first link material and the second link material from the side. The boom vibration suppression device according to any one of claims 1 to 4, further comprising an adjusting means.   The boom vibration suppressing device according to any one of claims 1 to 5, wherein the first link member includes an expansion / contraction mechanism capable of changing an axial length. A center frame installed in the traveling vehicle, a pair of side booms pivotally supported at the left and right positions of the center frame, a plurality of spray nozzles disposed on the center frame and the side boom and spraying liquid, and the liquid And a liquid supply means for supplying the liquid from the liquid storage tank to the spray nozzles,
A boom sprayer, wherein the boom vibration suppression device according to any one of claims 1 to 6 is installed in each of the side booms.