JPS6117757B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a telescopic boom device.

Conventionally, in telescopic boom devices such as aerial work vehicles, the hydraulic hose used to send hydraulic oil or water to the tip of the boom would bend, causing damage due to friction with the inner peripheral surface of the inner cylinder or outer cylinder. If the hydraulic hose is always tensioned with a resilient member to prevent this deflection, external force will be constantly acting on the hydraulic hose, which may cause deterioration of the hose or leakage from the joints. There were problems such as the occurrence of

The purpose of the present invention is to solve these problems, prevent damage and deterioration of the hydraulic hose, prevent liquid leakage accidents, and always store the hydraulic hose in a compact manner. A feature of the invention is that a liquid hose is disposed in the longitudinal direction in a telescoping boom formed by telescopically fitting an outer cylinder and an inner cylinder, and a winding drum for winding the liquid hose is included therein. Further, a gear is attached to the winding drum so that its axial direction coincides with the axial direction of the winding drum, and a pair of linear guide members are respectively connected to the inner cylinder and engage the gear from above and below in a clamping manner. The gear is provided in the outer cylinder, and the gear is rolled on the guide member by mutual expansion and contraction of the inner cylinder and the outer cylinder, and the hose is moved in the longitudinal direction while rotating the drum. By winding the hose in a right-handed and a left-handed manner, the above-mentioned mutual expansion and contraction action is converted into rotational motion of the winding drum, and the hose winding radius of the winding drum is set equal to the radius of the pitch circle of the gear, so that the inner cylinder and the outer cylinder are The length dimension of mutual expansion and contraction of the cylinder and the length dimension of the hose wound by the winding drum are set to be substantially equal.

Hereinafter, the present invention will be explained in detail based on illustrated embodiments.

In Fig. 1, 1 is an aerial work vehicle, a telescopic boom device 3 is mounted on a chassis 2, and 4 is a support stand on a turntable, on which the lower end of an outer cylinder 5 is supported. It is pivotally supported by a shaft 6 so as to be able to swing vertically and raise and lower, and is raised and lowered by a cylinder 7 for raising and lowering. 8 again
10 is an inner cylinder which is telescopically inserted into the opening at the tip of the outer cylinder 5, and a telescopic boom 9 is formed by the inner cylinder 8 and the outer cylinder 5, and 10 has one end connected to the outer cylinder 5 and the other end. This is a hydraulic cylinder pivotally connected to the inner cylinder 8, and performs the telescopic boom 9's telescopic operations A and B. Furthermore, a work box 11 is located at the tip of the telescopic boom 9.
is pivotally mounted on a support shaft 12, and the upper opening peripheral edge of the work box 11 is held horizontally by a horizontal maintenance hydraulic cylinder 13, and the work box 11 is inserted into the work box 11 to perform high-place work. Keep the worker in a stable posture. In general, these cylinders 7, 10, 13 are operated to expand and contract using hydraulic oil, and the pressure oil from a hydraulic pump (not shown) is switched and controlled by a switching valve to the piston side or piston rod side of the cylinders 7, 10, 13. Generally, flexible hydraulic hoses are used to pump the hydraulic fluid or return it to the reservoir.

That is, in FIGS. 2 to 4, reference numeral 14 denotes a flexible hydraulic hose disposed in the longitudinal direction within a telescopic boom 9 consisting of an outer cylinder 5 and an inner cylinder 8. , in the specific example, the hydraulic hose 14 has two substantially equal lengths, a base hose 14a and a tip hose 14.
b are connected to each other through a communication pipe 15, and the proximal end of the base hose 14a is fixed to a fixture 16 at the proximal end of the outer tube 5, while the distal end of the distal hose 14b is connected to the inner tube. A winding drum 18 is fixed to a fixture 17 at the tip of the cylinder 8, and is further provided in the telescopic boom 9 for winding up the hydraulic hose 14.
5 is fixed to the center of the winding drum 18 and bent to slightly protrude from the outer peripheral surface of the winding drum 18, and both ends of the communication pipe 15 and one end of the hoses 14a, 14b are connected in communication. , as shown in FIGS. 3 and 4, from the center of the winding drum 18 to the left and right directions,
a and the tip hose 14b are wound clockwise.

E is a telescopic rotation conversion mechanism that converts the mutual telescopic movements A and B of the inner cylinder 8 and the outer cylinder 5 into rotational movements C and D of the winding drum 18, and the axial direction is the rotational movement C and D of the winding drum 18. The gears 20, 20 attached to the winding drum are meshed with the gears 20, 20 from above and below so as to coincide with the axial direction, and a pair of straight lines are provided on the inner cylinder 8 and the outer cylinder 5, respectively. Guide members 21, 2
Consists of 2 and. Specifically, the axis of the winding drum 18 is arranged horizontally, and is perpendicular to the longitudinal direction of the telescopic boom 9. The gears 20, 20 are connected to the outer flanges 19, 19 of the winding drum 18, and the radius R of the pitch circle of the gear 20 and the winding radius r of the hose 14 wound around the winding drum 18 are are set equal to each other, and furthermore, on the inner surface of the ceiling wall of the inner cylinder 8,
A pair of left and right linear guide members 21, 21 having concave and convex teeth that mesh with the concave and convex teeth of the gear 20 are fixed in the longitudinal direction, and a pair of left and right linear guide members 21, 21 in the longitudinal direction are fixed to the inner surface of the bottom wall of the outer cylinder 5. Guide members 22, 22
is fixed, and the guide member 2 extends from the longitudinal opening 23 formed in the bottom wall of the inner cylinder 8 into the inner cylinder 8.
The concave and convex tooth portions 2 and 22 protrude and mesh with the concave and convex teeth of the gear 20. Therefore, the guide members 21, 2
2 is a pair of upper and lower racks that mesh with the gear 20 from above and below in a hook-like manner, and since the winding drum 18 and the gears 20, 20 do not have pivot shafts, as shown by solid lines and imaginary lines in FIG. For example, if the inner cylinder 8 extends by a length L in the direction of arrow A, the gear 20 moves by (L/2) while rolling toward the tip. Therefore, both hoses 1
4a and 14b (L/2) each are pulled out from the winding drum 18, and the total length dimension of both hoses 14a and 14b pulled out is L/2×2=L, and the winding drum is pulled out by the extended length L. It will be withdrawn from 18.

Conversely, when the inner cylinder 8 is shortened in the direction of arrow B, the total length of the hoses 14a, 14b is wound around the winding drum 18 by the shortened length.

In this way, the mutual telescoping movements A and B of the inner cylinder 8 and the outer cylinder 5 are converted into the rotational movements C and D of the winding drum 18 by the telescoping rotation conversion mechanism E without using a separate drive source.
can be converted to . Therefore, as the telescopic boom 9 expands and contracts, the winding drum automatically rotates to release and wind up the hose 14. Moreover, in the telescopic rotation conversion mechanism E interlockingly connected to the winding drum 18, the hose winding radius r of the winding drum 18 is set equal to the radius R of the pitch circle of the gear 20, so that the outer cylinder 5 and the inner cylinder 8 and the winding length of the hose 14 by the winding drum 18 are set to be substantially equal.

Next, in another embodiment shown in FIG. 5, the communication pipe 15 of the previous embodiment is omitted, and instead, a locking protruding member 24 is protruded from the center of the winding drum 18, and the hydraulic hose 14 is If the protruding member 24 is wound in a U-shape in a continuous shape with no seam in the center, it will be wound on the left and right halves of the winding drum 18 as a left-hand winding and a right-hand winding, respectively, as described above. By making the winding radius equal to the radius of the gear 20, the hose 14 will be reliably wound or pulled out without bending or tensile force.

Thus, in an alternative embodiment shown in FIGS. 6 and 7, the inner cylinder 8 has no opening in its bottom wall to improve strength and rigidity, and instead has longitudinal openings in its side walls. A long hole 25 is opened, and shafts 26, 26 protruding on the left and right sides of the winding drum 18 contained in the inner cylinder 8 are inserted into the long hole 25.
5, 25 and enters into the gap 27, 27 between the side walls of the inner and outer cylinders 8, 5, and the gear 20,
Fix 20. The radius R of the pitch circle of the gear 20
is set equal to the winding radius r of the hose wound around the winding drum 18, and the linear guide members 21 and 22, which engage the gear 20 from above and below in a clamping manner, are connected to the side wall of the inner cylinder 8 and the outside, respectively. It is fixed to the bottom wall of the cylinder 5. A communication pipe 15 is fixed to the winding drum 18, and the base hose 14a and the tip hose 1 are wound in reverse left and right directions.
4b is wound up. Moreover, the telescopic length of the telescopic boom 9 and the length of the hydraulic hose 14 taken up by the winding drum 18 are similar to the previously described embodiments, and the telescopic rotation conversion mechanism E is , cavity 2
Gear 20 and guide members 21, 22 arranged at 7
It consists of

It should be noted that the present invention is not limited to the embodiment shown in the drawings and is of course subject to design changes.As a special work vehicle, the present invention has a telescoping boom, and the tip of the boom is filled with hydraulic oil, water, and other liquids. It is sufficient if the car has a structure where a hydraulic hose is installed to flow the water.
Alternatively, it is free even if a part of the refracting boom is a telescoping boom.
Furthermore, it is not limited to cars, and can be used freely even if it is a stationary telescopic boom. Also, the gear 2 in the above embodiment
0 as a chain wheel and linear guide members 21, 2
It is also preferable that 2 be a chain.

The present invention has effectively achieved its intended purpose with the configuration detailed above. In particular, the mutual expansion and contraction operations A and B of the inner cylinder 8 and outer cylinder 5 cause the gears 20 and 20 to be moved to the guide member 2.
1 and 22, and move the hose 14 in the longitudinal direction while rotating the drum 18.
Since the reciprocal expansion and contraction operations A and B are converted into rotational motions C and D of the winding drum 18 by winding the winding to the right and left, there is no need to attach a separate winding drum drive device and the structure can be simplified. It is possible to reduce the number of failures. Furthermore, by setting the mutual expansion/contraction length dimension L of the inner cylinder 8 and the outer cylinder 5 and the winding length dimension of the hose 14 by the winding drum 18 to be approximately equal, the hydraulic hose 14 may become too tensioned. It is possible to reliably prevent the hose 14 from sagging, thereby eliminating accidents such as breakage and liquid leakage due to overtension of the hose 14, and accidents where the slack of the hose 14 comes into sliding contact with the inner surfaces of the inner and outer cylinders 8 and 5 and is abraded and damaged. Moreover, the entire telescopic boom 9 can be made compact.

[Brief explanation of the drawing]

Figure 1 is a side view showing one embodiment of the present invention, Figure 2 is a side view showing one embodiment of the present invention;
3 is a cross-sectional view of the main part, FIG. 4 is a partially sectional plan view, FIG. 5 is a perspective view of another embodiment, and FIG. 6 is a further embodiment. The partially sectional side view shown in FIG. 7 is a cross-sectional view of the same. 5... Outer cylinder, 8... Inner cylinder, 9... Telescopic boom,
14... Hydraulic pressure hose, 18... Winding drum, E... Telescopic rotation conversion mechanism, L... Telescopic length dimension.

Claims (1)

[Claims] 1 A winding drum 1 that arranges a liquid hose 14 in the longitudinal direction in a telescopic boom 9 formed by telescopically fitting an outer cylinder 5 and an inner cylinder 8 and winds up the liquid hose 14.
Further, gears 20, 20 are attached to the winding drum 18 so that the axial direction coincides with the axial direction of the winding drum 18, and the gears 20, 20 are clamped from above and below. A pair of linear guide members 2 that mesh with each other
1 and 22 are provided in the inner cylinder 8 and the outer cylinder 5, respectively, and the inner cylinder 8
By the mutual expansion and contraction operations A and B of the outer cylinder 5, the gears 20 and 20 are caused to roll on the guide members 21 and 22, and the winding drum 18 is rotated and moved in the longitudinal direction, so that the hose 14 is The winding cylinder 18 winds the winding clockwise and counterclockwise to perform the above-mentioned mutual expansion and contraction operations A and b.
is converted into rotational motions C and D of the winding drum 18, and the hose winding radius r of the winding drum 18 is set equal to the radius R of the pitch circle of the gear 20, so that the inner cylinder 8 and the outer cylinder 5 are mutually connected. A telescopic boom device characterized in that a telescopic length L and a length of the hose 14 taken up by the winding drum 18 are set to be substantially equal.