JP2873756B2 - Heavy object transport trolley - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to the case of moving a concrete caisson from a production yard onto a launching platform, and the case of moving a large precast concrete product from a production yard or a stock yard to another place. The present invention relates to a heavy goods transport trolley used for moving heavy goods.

[0002]

2. Description of the Related Art Conventionally, for example, a heavy caisson such as a concrete caisson is manufactured on a production table having a plurality of bogie introduction grooves for the purpose of carrying out the caisson. Insert a trolley with a jack,
The jack is extended under the caisson, the caisson is loaded on the bogie, and moved on the track.

A conventional bogie 1 of this type has an upper frame 6 supported by a plurality of coil springs 5 on a lower frame 4 having wheels 3 rolling on a track 2 as shown in FIG. 6, a plurality of hydraulic jacks 7 are fixed upward.

[0004]

In the above-described conventional heavy object transport truck, when a heavy object such as a concrete caisson is lifted by using a plurality of trucks and moved on the track 2, each truck 1 When the rails 1 move, the lower frames 4 of the trucks 1, 1 due to changes in the gap between the tracks 2, 2 and the inclination of the track 2, the difference in the inclination of the track contact surfaces of the wheels 3, etc. 6A changes from the initial interval L1 shown in FIG. 6A to L2 as shown in FIG. 6B.

On the other hand, since the bottom surface of the heavy caisson A is in contact with the jack 7 of the upper frame 6, it cannot move relative to the bottom surface of the caisson. For this reason, the change in the interval between the lower frames 4 and 4 is absorbed by the distortion of the coil spring 5 in the lateral direction. At this time, stress is generated in a direction to correct the distortion. This stress is quite large when supporting several hundred tons of caisson A.

When the jack 7 is contracted and the caisson is lowered on another stand in a state where such a lateral stress is applied, the load becomes small during the descent and the friction force of the wheel 13 on the track 2 is reduced. Is smaller than the above-described horizontal stress, the lateral strain of the coil spring 5 is instantaneously returned to the original state, thereby generating a large impact force. This is transmitted as an impact load to the bearing portion of the jack head, the side surfaces of the cylinder and the piston, and the wheel flange surface, causing uneven wear of the equipment.

[0007] In view of such a conventional problem, the present invention disagrees with the track center where the bogie is inclined with respect to the track direction and the bogie center, and in the horizontal direction during descent caused by rail and wheel accuracy. It is an object of the present invention to provide a heavy goods transport cart that does not generate an impact.

[0008]

The features of the present invention for solving the conventional problems as described above and achieving the intended object are as follows.
A lower frame having wheels that can roll on a track, an upper frame swingably supported on the lower frame via a spring, and a heavy lifting hydraulic jack supported by the upper frame. In the heavy load transporting vehicle provided, a hydraulic jack is supported on the upper frame so as to be slidable in a horizontal direction substantially perpendicular to a moving direction of the lower frame, and the hydraulic jack is centrally mounted on the upper frame. An elastic pressing tool for automatically returning to the position is provided.

[0009]

According to the heavy object transporting cart of the present invention, the space between the lower frames of the respective carts changes during the loading movement due to the discrepancy between the track center and the bogie center, and the track laying accuracy and wheel accuracy. However, since the change is absorbed by the movement of the jack with respect to the upper frame, a large impact return force does not occur even when a large load is removed. When the load is removed, each jack is returned to the original neutral position by the elastic pressing device for automatic return.

[0010]

Next, an embodiment of the present invention will be described with reference to FIGS.

In FIG. 1, reference numeral 10 denotes a carriage mounted on a track. The transport vehicle 10 has a lower frame 11 in which a number of wheels 13, 13,... Are arranged in two rows on a lower surface via a bearing 12, so that the wheels 13, 13,. It has become.

An upper frame 15 is supported on the upper surface of the lower frame 11 via a number of coil springs 14, 14,.... Are arranged in multiple rows between the upper surface of both sides in the longitudinal direction of the lower frame 11 and the lower surface of the upper frame 15 opposed thereto.

The upper frame 15 has a pair of loading tables 18 on its upper surface in the longitudinal direction. Three lifting jacks 19, 19, 19, which are located between the loading tables 18 and 18 and which are directed upward and downward, are connected to the upper frame 1.
5 is supported. Each hydraulic jack 19 is supported by the upper frame 15. Each hydraulic jack 19 has a telescopic rod 20 inserted and removed upward, and a pad 22 is swingably supported at its upper end via a hemispherical seat.

Each of the hydraulic jacks 19 is fixed to a sliding plate 23, and the sliding plate 23 is disposed between the loading tables 18, 18 of the upper frame in a horizontal direction, that is, in a direction orthogonal to the traveling direction of the bogie. Sliding guide 24
a, 24b slidably supported.

The sliding plate 23 is configured such that both side surfaces thereof are pressed by automatic reciprocating pressing members 25, 25... As shown in FIG. 4, each of the pressing members 25 is urged in a projecting direction by a cylinder 26 fixed to the outside of the loading table 18, a coil spring 27 housed in the cylinder 26, and the coil spring 27. Tip is sliding plate 2
3 and a pressing rod 28 that is in contact with the pressing rod 3. The initial compression amount of the coil spring 27 is adjusted by an adjusting screw 29 screwed into the rear end of the cylinder 26.

A bogie lifting jack 30 for lifting and turning the bogie is provided at the center of the lower frame 11. This jack has an upper sleeve 36 which is non-rotatably supported on the center lower surface of the lower frame 11, and a lower sleeve 34 having a ground plate 35 fixed to the lower end thereof is freely movable in and out of the upper sleeve 36. The lower sleeve 3 is accommodated by a hydraulic cylinder (not shown).
4 is designed to be moved in and out. Lower sleeve 34
Is turned around 90 ° by a turning drive hydraulic cylinder 37 interposed between it and the lower frame 11.

A driving mechanism for self-propelling is provided at one end of the lower frame 11.

In this traveling drive mechanism, a pair of drive wheels 41, 41 is mounted on a wheel support frame 40 extending in the width direction of the lower frame 11, and a reduction gear is provided by a hydraulic motor 43 having an axle 42 at the center of the frame. To be driven.

The wheel support frame 40 is supported by the swing frame 45, and a lifting hydraulic cylinder 48 is interposed between the wheel supporting frame 40 and a bracket 49 supported by the lower frame 11 and extending upward. The wheel support frame 40 is moved up and down by the expansion and contraction, so that the wheels 41 are grounded or lifted.

The carriage 10 constructed as described above operates the hydraulic unit of the hydraulic jack 19 under a heavy object A such as a large concrete caisson by operating a hydraulic unit.
0, the pad 22 comes into contact with the bottom surface of the heavy object A, the weight of the heavy object A is applied to the upper frame 15 via the hydraulic jack 19, and the coil springs 14 are pressed and contracted. The weight A is lifted while the strength and the weight of the heavy object A are balanced. In this way, the carrier 10 is run on the track by pulling or pushing it while the heavy object is loaded.

At this time, the traveling drive mechanism contracts the hydraulic cylinder 48 to raise the wheel 41 to a level at which the wheel 41 does not contact the track.

When the heavy object A is moved on the track while being loaded in this way, the lower frame 11, 11,... Of each of the transport vehicles 10, 10,. , The horizontal interval changes as in the conventional example shown in FIG. A lateral load is applied between the hydraulic jack 19 and the upper frame 15 according to the change in the interval. In accordance with this load, the sliding plate 23 moves along the sliding guides 24a, 24b, and absorbs a change in the interval between the lower frames 11, 11,..., And thus between the carts 10, 10,. No horizontal distortion is caused between the frames 11 and 15 of the section.

After the transportation, the hydraulic jack 19 is again contracted and lowered, and the heavy object A is placed on another fixed base. When the hydraulic jack 19 is separated from the bottom surface of the heavy object A, the right or left is moved. The pressing plate 25 is pressed to push the biased sliding plate 23 back to the neutral position, whereby the hydraulic jack 19 is automatically returned to the original center position.
Although the bogie lifting jack 30 for turning and the self-propelled traveling drive mechanism are used in the present embodiment, they are not necessarily required in the present invention.

[0024]

As described above, the heavy object transporting cart of the present invention has a hydraulic jack for lifting a heavy object which is slidably supported in the horizontal direction with respect to the upper frame so that each of the carts can be transported during the heavy object transport. Even if the gap between them occurs, this is absorbed by the slide of the hydraulic jack and does not cause horizontal distortion of the coil spring between the upper and lower frames, and therefore, when the heavy load is lowered, the load amount is removed. No shock is generated. After the load is removed, the sliding hydraulic jack is automatically returned to the center position by the elastic pressing device for automatic return.Therefore, there is no need to adjust the position of the hydraulic jack when lifting heavy objects with the hydraulic jack. You can start working.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view showing a truck according to an embodiment of the present invention.

FIG. 2 is a partial vertical sectional side view of the same.

FIG. 3 is a plan view of the same.

FIG. 4 is a partially enlarged sectional view of a hydraulic jack supporting portion.

FIG. 5 is a partial vertical sectional side view showing a conventional heavy object transporting cart.

FIG. 6 is a plan view showing a change in a bogie interval when moving on a track.

[Explanation of symbols]

 Reference Signs List A caisson 10 transport trolley 11 lower frame 12 bearing 13,41 wheel 14,27 coil spring 15 upper frame 18 loading table 19 jack for lifting heavy objects 20 telescopic rod 22 padding 23 sliding plate 24a, 24b sliding guide 25 pressing Fixture 26 Cylindrical body 28 Press rod 29 Adjusting screw 30 Bogie lifting jack 37, 48 Hydraulic cylinder 34 Lower sleeve 35 Ground plate 36 Upper sleeve 40 Support frame 42 Axle 43 Hydraulic motor 45 Swing frame 49 Bracket

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-3-1111 (JP, A) JP-A-49-87041 (JP, A) JP-A-1-308395 (JP, A) (58) Field (Int.Cl. ⁶ , DB name) B65G 7/04 B66F 5/00 B66F 3/24

Claims (1)

(57) [Claims] 1. A lower frame having wheels that can roll on a track, an upper frame swingably supported on the lower frame via a spring, and a heavy lifting object supported by the upper frame. And a hydraulic jack for supporting the hydraulic jack with respect to the upper frame so as to be slidable in a horizontal direction substantially perpendicular to the moving direction of the lower frame. A heavy object transporting trolley comprising an elastic pressing tool for automatically returning the hydraulic jack to a center position.