JP2006225055A - Aerial work platform vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an aerial work platform vehicle structured so that a weight for preventing a boom from tumbling is mounted in such a way as inserted in the condition hidden in a column provided for mounting the boom. <P>SOLUTION: The aerial work platform vehicle is structured so that the column 3 revolving within a horizontal plane relative to a revolving shaft 2 installed behind a frame 1 having running function is installed vertically in such a way as extended backward and that the boom 5 fitted with a gondola 4 is connected with the column with possibility of rising and falling and also extended and retracted, wherein the weight 23 is inserted into the column. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an aerial work vehicle used when working at a high place.

  Work in orchards, such as selection, pollination, weeding, and harvesting, need to be done not only at high altitude but also moving. For this reason, an aerial work vehicle such as that shown in Patent Document 1 below is often used. This aerial work vehicle is provided with a boom having a gondola attached to the end of which a person can ride on the traveling frame so as to be able to turn, undulate and extend. However, a conventional aerial work vehicle has a boom of 360 °. It was intended to make a full turn.

This is convenient in this, but on the other hand it is expensive. In this type of aerial work vehicle, since the traveling frame itself has a steering function, a full turn is not necessary and a partial turn is sufficient. In addition, if the entire turn is performed, the center of the turn must be set to the center of the frame, and if this is done, the distance from the turn center to the grounding end of the grounding member is shortened, the supporting force is reduced, and the slope is inclined. Then there is even a risk of falling. Further, since it is necessary to avoid the boom from interfering with other members, the boom inevitably becomes a high position, and also in this point, posture stability is lacking.
JP 2001-19374 A

  The present invention addresses such a problem, and among the factors for stabilizing the posture, the weight in the vicinity of the pivot center of the boom is increased to prevent the boom from being lifted to avoid falling, and this weight The increase was achieved by effectively placing weights.

  Under the above-mentioned problems, the present invention is a longitudinally extending column that can be swiveled in a horizontal plane with respect to a swivel shaft provided at a rear portion of a frame having a traveling function, as defined in claim 1, Provided is an aerial work vehicle in which a boom having a gondola attached to a column is connected in a retractable and extendable manner, and a weight is inserted into the column.

  Further, the present invention relates to the above-described aerial work vehicle, wherein the boom described in claim 2 is a means in which the boom extends from the column beyond the pivot axis in a direction 180 ° forward, and the frame described in claim 3 However, the left and right vertical members are in the form of a cross-girder with two front and rear horizontal members, and the swivel axis is provided behind the rear horizontal member, and also in the rear horizontal member Means for inserting a weight, and means for providing a weight inserted in a column and a weight inserted in a lateral member according to claim 4 are the same.

  According to the first aspect of the present invention, when the weight of the frame is increased as one measure for stabilizing the posture, this is achieved by adding a weight at a position close to the swing axis that is the pivot center of the boom. And efficient. Therefore, it is not necessary to make the whole frame having various harmful effects heavy. In addition, since the weight is hidden, the design is improved, and the space is effectively used and the area of the frame does not increase. Further, according to the means of claim 2, since the boom and the column are always arranged opposite to each other by 180 °, an efficient weight effect can be realized, and this relationship is different regardless of where the boom is turning. Absent.

  According to the third aspect of the present invention, since the weight can be arranged before and after the pivot shaft, the weight can be added efficiently. In this, one is arranged in the vertical direction and the other is arranged in the horizontal direction. Therefore, the weight effect can be spread in a balanced manner in the front-rear direction and the left-right direction. Also, weight concealment and effective use of space are the same as described above. Furthermore, according to the means of claim 4, the cost for the weight is reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is a side view of an aerial work vehicle showing an example of the present invention, FIG. 2 is a plan view, FIG. 3 is a side view of the main part, and FIG. 4 is a plan view of the main part. The frame 1 which is a chassis, the turning shaft 2 which is a vertical axis provided in the frame 1, the column 3 which turns around the turning shaft 2 in a horizontal plane, and the gondola 4 attached to the tip of the column 3 Boom 5 connected to the.

  The frame 1 has a cross beam shape in which two front and rear horizontal members 7 are passed to two left and right vertical members 6. In this example, the vertical member 6 is an upright plate-shaped member, a horizontal member. 7 is constituted by a rectangular pipe that is passed from the upper and lower middle portions of the vertical member 6 to the left and right. In this case, the rear lateral member 7a has a square cross section, but the front lateral member 7b has a rectangular shape with a flat cross section, and its bottom surface is set to the same height. On the frame 1, an engine 8, a hydraulic pump 9, a hydraulic oil storage tank 10, a battery 11, and the like are mounted.

  In this example, a driving wheel 12 is provided at the rear portion of the vertical member 6 of the frame 1 and a driven wheel 13 is provided at the front portion, and a crawler 14 is wound around the driving wheel 12 and the driven wheel 13. (15 is some grounding idler wheels provided between them). An HST type hydraulic motor 16 is directly attached to the inside of the left and right drive wheels 12, and is driven by hydraulic oil pressurized by the hydraulic pump 9. Therefore, by adjusting the rotation speed and direction of the left and right hydraulic motors 16, the frame 1 can move forward and backward, change the speed, go straight, and turn.

  In this case, the engine 8 is installed in the middle of the frame 1 on the right side in the traveling direction. Specifically, the base 17 is passed to the front and rear transverse members 7a and 7b, and is mounted on the anti-vibration mount and 8a. At this time, the upper surface of the base 17 is lower than the upper surface of the transverse member 7, and the position of the engine 8 is lowered. In addition, since the fuel tank 8b is at the highest position in the engine 8, if it is disposed separately in another place (for example, in front of the engine 8) (not shown), it is installed at a lower position. In addition, interference with the boom 5 and the like can be avoided and this can be set at a low position. In addition, the hydraulic pump 9 is installed in front of the engine 8 and is coupled by a pulley belt mechanism 18.

  The hydraulic oil storage tank 10 is disposed on the left side in the traveling direction corresponding to the engine 8, and is provided at a position as low as the engine 8. Further, the battery 11 is disposed in front of the hydraulic oil storage tank 10. By arranging the heavy engine 8 and the hydraulic oil storage tank 10 in this way, the weight is balanced and the posture is stabilized by lowering the center of gravity. Since the tallest members are the engine 8 and the hydraulic oil storage tank 10, they are covered and protected by two guards 19 on the left and right.

  The column 3 rotates around the pivot shaft 2. In this example, a spacer 20 is attached to the rear center of the rear lateral member 7 a, and a bearing cylinder 21 is erected at the rear part of the spacer 20. A boss 22 formed in front of the column 3 is inserted so that the turning shaft 2 is passed. In this respect, the position of the turning shaft 2 is set at the rear portion of the frame 1, and specifically, the rear end of the contact area of the crawler 14 is slightly behind.

  Further, the vertical position of the turning shaft 2 is kept as low as possible, and is set to be overlapped with the side projection surface of the crawler 14. By the way, a square pipe is used for the column 3, and a weight 23 is inserted therein. Incidentally, in this example, the rear lateral member 7a also uses a square pipe, and the weight 24 can be inserted therein. Therefore, two weights 23 and 24 are provided in the longitudinal direction and the other in the lateral direction before and after approaching the turning shaft 2, and the weight in the vicinity of the turning shaft 2 is very heavy. ing. In addition, since both the weights 23 and 24 are hidden, the design is improved, no space is required, and the area of the frame 1 is not increased. The weight 24 is the same as the previous weight 23, and has a combined effect. For both the weights 23 and 24, solid round bars are suitable in terms of cost. However, since they are not good if they jump in the column 3 or the horizontal member 7a, they should be fitted tightly. The weights 23 and 24 have a vehicle length of 1.7 m, a vehicle width of 1.3 m, and a maximum extension length of 3.5 m up to the gondola 4 of the boom 5, one is assumed to be 80 kg, and both are assumed to be about 160 kg. is doing.

  The column 3 is turned by the turning cylinder 25 in this example. That is, the head 25a of the revolving cylinder 25 is attached to the rear transverse member 7a and the like so as to be rotatable in a horizontal plane, and the rod 25b is pivotally attached to the bracket 26 projecting from the column 3. Therefore, when the turning cylinder 25 is expanded and contracted, the column 3 rotates (turns) around the turning shaft 2. In this case, the turning cylinder 25 is provided in the vicinity of the height of the hydraulic motor 16, and is surrounded and protected by the hydraulic motor 16, the turning shaft 2, the spacer 20, and the like. With this configuration, the turning range of the column 3 is limited, and in this example, the range is set to 30 ° from the front to the left and right, but in addition, it is set in the range of 0 to 90 °. Sometimes.

  By the way, the swing cylinder 25 may be driven by hydraulic oil pressurized by the hydraulic pump 9, but in this example, the rotary cylinder 25 is hydraulic oil pressurized by the electric hydraulic pump 27 provided near the rotary shaft 2. I try to drive it. The electric hydraulic pump 27 here is an integrated motor, pump and tank, and in this example is driven using the power supply of the battery 11. This is because the boom 5 can be turned even when the engine 8 is not operated, and the safety and efficiency of work can be improved.

  The boom 5 is pivotally attached to the upper portion of the column 3 by a connecting pin 28. The boom 5 is a first boom 5a in which the second boom 5b can be moved in and out. If the telescopic cylinder 29 is stretched between the booms 5a and 5b, the telescopic cylinder 29 is expanded and contracted. The second boom 5b expands and contracts with respect to the first boom 5a. At this time, the boom 5 extends from the column 3 beyond the revolving shaft 2, so that the boom 5 and the column 3 are positioned at 180 ° opposite to each other with the revolving shaft 2 interposed therebetween. In addition, about the number of the above booms 5, it is an example, Comprising: It is not limited to this.

  Further, the boom 5 can be raised and lowered with respect to the column 3. That is, the hoisting cylinder 30 is provided between the column 3 and the first boom 5 a, and the hoisting cylinder 30 is expanded and contracted to raise and lower the boom 5 with respect to the column 3. In this case, it is preferable that the boom 5 is attached to a position as low as possible with respect to the column 3. Specifically, when the boom 5 is fully extended and lowered to the lowest position, it is a member located at the lowest position. The hoisting cylinder 30 is lowered to a range where it does not hit the guard 19 provided on the frame 1.

  A fixture 31 is provided at the tip of the second boom 5 b, and the gondola 4 is fixed to the fixture 31 with a pin 32. Since this gondola 4 is for a person to work on the gondola 4, it includes various operating instruments (not shown) for remotely operating the hydraulic motor 16 and the cylinders 25, 29, 30, etc. ) Is provided. Furthermore, the gondola 4 needs to face straight regardless of the undulation angle of the boom 5.

  Therefore, the input cylinder 33 is attached between the column 3 and the first boom 5a, and the output cylinder 34 is attached between the fixture 31 and the gondola 4, and both the cylinders 33, 34 are set to 1: 1 in a closed circuit. Linked in relationship. According to this, since the output cylinder 34 is displaced according to the displacement of the input cylinder 32 based on the undulations of the boom 5, the gondola 4 is always directed straight.

  The above-mentioned aerial work platforms are mounted on trucks or self-propelled and go to the work site such as orchards, where they work as described above. At this time, the orchards have many sloping lands, As mentioned above, there is a risk of falling. For this reason, in the present invention, various considerations have been made in order to avoid the risk of falling, and one of them may increase the weight of the frame 1. Then, the weight of the turning center of the boom 5, that is, the weight in the vicinity of the turning shaft 2 is increased.

  When the force applied to the gondola 4 increases relatively with the extension or turning of the boom 5 and the frame 1 falls down, the turning center of the boom 5 is lifted. At this time, if the weight of the part is heavy, the lifting is suppressed. And fall is prevented. Specifically, the transverse member 7a and the column 3 are arranged before and after the turning shaft 2, and the weights 23 and 24 are inserted into the transverse member 7a and the column 3, respectively. At this time, since one weight 23 is inserted vertically into the column 3 and the other weight 24 is inserted horizontally into the transverse member 7a, it works efficiently in the front-rear direction and the left-right direction, and has a small weight. A great effect can be expected. In addition, the weights 23 and 24 cannot be seen from the outside, and the space can be used effectively and the area of the frame 1 is not increased.

  The second is to increase the contact length of the crawler 14 with respect to the extending direction of the boom 5. The falling direction includes the front-rear direction and the left-right direction. In either direction, the longer the contact length of the crawler 14 with respect to the direction in which the boom 5 extends, the greater the supporting force and the more stable the posture. For this reason, in this example, the turning of the boom 5 is limited to a certain range from the front to the left and right, and the turning shaft 2 is set at the rear end of the contact area of the crawler 14 or around the rear. Yes.

  Thirdly, the center of gravity of the frame 1 is lowered, and the boom 5 is set as low as possible. If the center of gravity of the frame 1 is lowered, it goes without saying that the posture is stabilized. In this example, the engine 8 and the hydraulic oil storage tank 10 are provided at the lowest possible position. Further, if the turning center of the boom 5 is high, a slight inclination is greatly amplified as a falling moment. In this example, the hoisting cylinder 30 is lowered to a range where it does not interfere with the guard 19 of the frame 1.

  By taking the above-mentioned measures, it has been confirmed that the aerial work vehicle does not tip over even when the boom 5 is extended and turned to the maximum when tilted within 15 ° in all directions.

It is a side view of an aerial work vehicle showing an example of the present invention. It is a top view of an aerial work vehicle showing an example of the present invention. It is a side view of the principal part of an aerial work vehicle showing an example of the present invention. It is a top view of the principal part of an aerial work vehicle which shows an example of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Frame 2 Rotating shaft 3 Column 4 Gondola 5 Boom 5a 1st boom 5b 2nd boom 6 Vertical member 7 Horizontal member 7a Backward side member 7b Front side member 8 Engine 8a Anti-vibration mount 8b Fuel tank 9 Hydraulic pump 10 Hydraulic oil Storage tank 11 Battery 12 Drive wheel 13 Drive wheel 14 Crawler 15 Ground idler wheel 16 Hydraulic motor 17 Base 18 Pulley belt mechanism 19 Guard 20 Spacer 21 Bearing cylinder 22 Boss 23 Weight 24 Weight 25 Head 25b 〃 Rod 26 of revolving cylinder 25a 〃 Bracket 27 Electric hydraulic pump 28 Connecting pin 29 Telescopic cylinder 30 Undulating cylinder 31 Mounting tool 32 Pin 33 Input cylinder 34 Output cylinder

Claims (4)

  A column that can be swiveled in a horizontal plane with respect to a swivel shaft provided at the rear of the frame having a traveling function was extended vertically to connect a boom with a gondola attached to the column so that it could be raised and lowered. An aerial work vehicle, characterized in that a weight is inserted into a column in an aerial work vehicle.   The aerial work vehicle according to claim 1, wherein the boom extends from the column beyond the pivot axis in a direction 180 ° forward.   The frame has a cross-girder shape in which two vertical members on the left and right are passed by two horizontal members on the front and rear, and the pivot axis is provided behind the rear horizontal member, and in the rear horizontal member The aerial work vehicle according to claim 1 or 2, wherein a weight is inserted.   The aerial work vehicle according to claim 3, wherein the weight inserted into the column and the weight inserted into the lateral member are the same.