JPS6143834Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a jacking device for supporting a swivel table.

Truck cranes, which have become larger due to the rise in the height of buildings, are heavy, so it is difficult to drive them on general roads.
This movement was not allowed as it could cause damage to bridges, road shoulders, etc., and after removing the multi-stage boom from the swivel platform, the jacking devices installed at the front and rear of the swivel platform were extended to separate the swivel platform from the truck.
This is done by transporting the multi-stage boom and swivel stand separately using transport means such as a trailer. When the swivel base is separated from the truck, the swivel base is supported by extending the jacking devices provided at the front and rear of the swivel base. Therefore, although this jacking device is designed to be strong enough to support this swivel base, it is possible to accidentally extend the jacking device with the multi-stage boom attached and use the jacking device to turn the table. When attempting to support the stand, there was a risk that the jacking device would break and cause a serious accident.

This invention provides a swivel base support jacking device that allows the swivel base support jacking device to be attached only after the multi-stage boom is removed from the swivel base.

Next, the present invention will be explained based on a specific example.

A is a truck, and a swivel base B is mounted on the truck A via a bearing 1. This swivel base B
is equipped with a boom holder 3 whose base end is pivoted 2, a lifting cylinder 4 for controlling the raising and lowering of the boom holder 3, an operator's room 5, a winch device 6, and the like. C is a multi-stage boom consisting of a plurality of boom tubes, which is equipped with a hydraulic cylinder (not shown) and expands and contracts when the hydraulic cylinder is driven to expand and contract. In this way, multi-stage boom C
Since it has a hydraulic cylinder inside, it is quite heavy.

The connection and fixation of the multi-stage boom C and the boom holder 3 is performed by inserting the multi-stage boom C in the longitudinal direction of the boom holder 3, and then connecting the base end of the outermost cylinder of the boom cylinders forming the multi-stage boom C with the boom holder. This is done by connecting the three proximal ends with pins.
Reference numeral 7 refers to a rear jack for supporting a swivel base, which has an inner cylinder fitted into an outer cylinder disposed on the rear lower surface of the swivel base B so as to be able to extend freely in the left-right direction, and a jack cylinder disposed at the tip of the inner cylinder. A leg plate 7' is disposed at the lower end of this jack cylinder. D
is a jack holder, in which a pair of left and right protruding arms 8, 8 are connected by a connecting member 38. The protruding arms 8, 8 have rotation fulcrum holes 9, 9, fixing holes 10,
10, connection holes 11, 11 are drilled, respectively.
The rotation fulcrum pins 13, 13 are connected to these rotation fulcrum holes 9, 9, with the rotation fulcrum holes 9, 9 overlapping the holes 12, 12 drilled below the tip of the boom holder 3. 12, 12, the jack holder D is suspended below the tip of the boom holder 3. From this state, the jack holder D is rotated in the forward direction of the boom holder 3, and the holes 14 and 1 are bored in the bracket provided protruding from the tip of the boom holder 3.
4 and the fixing holes 10, 10 are overlapped with each other, and the fixing pins 15, 15 are inserted into these fixing holes 10, 10,
When inserted into the holes 14, 14, the jack holder D is stretched in front of the boom holder 3. In this state, the protruding arms 8, 8
The rollers 16 and 17 provided on the bottom face the lower surface of the multi-stage boom C.

E is a front jacking device for the swivel base support;
The inner cylinder 19 is inserted into and removed from the outer cylinder 18, and
A hydraulic cylinder (not shown) is disposed between the outer cylinder 18 and the inner cylinder 19. Reference numeral 20 denotes a floor plate swingably provided at the lower end of the inner cylinder 19. 21 is
This is an abutment arm that is formed on the upper part of the outer cylinder 18 and projects laterally in a state substantially orthogonal to the outer cylinder 18 . A bracket 23 having a mounting hole 22 formed in the upper part is fixed to the tip of the contact arm 21. 24 is
This is a rope end fitting provided on the bracket 23.
25 is a sheave provided to protrude forward from above the tip of the boom holder 3.

The front jacking device E for supporting the swivel table is attached to the jacking holder D in the following manner. First, after removing the multistage boom C from the boom holder 3, ropes 30 and 30, which will be described later, are lowered from the sheaves 25 and 25, respectively, and the rope ends of the front jacking device E for supporting the swivel platform are laid down on the ground. It is fixed to the metal fitting 24. From this state,
When the winch 6 is driven in the direction of winding the rope, the front jacking device E for supporting the rotating platform stands upright, and the upper surfaces of the contact arms 21, 21 come into contact with the lower surfaces 8', 8' of the protruding arms 8, 8. . In this state, attaching hole 2
By inserting the pins 26, 26 between the connecting holes 11, 11 which overlap with the connecting holes 11, 22, the front jacking device E for supporting the swivel table can be fixedly connected to the jacking holder D. In this state, the outer cylinder 18 of the front jacking device E for the swivel base support is located in front of the tip of the boom holder 3, intersects with the longitudinal direction of the boom holder 3, and is placed largely upward with respect to the lower surface of the boom holder 3. protrudes to. In other words, the front jack device E for supporting the swivel base is configured such that it cannot be connected to the jack holder D when the multi-stage boom C is supported by the boom holder 3.

E is a movable body that is located on the upper surface of the boom holder 3 and moves back and forth, and is provided with a pulley 26 and a rope attachment part 27. After the rope 28 let out from the winch 6 is folded back by the pulley 26, it is fixed 29 to the boom holder 3, and one end of the rope 30 is fixed to the rope fixing parts 27, 27, and then the sheaves 25, 25 are fixed. After passing through the radius, the multi-stage boom C stops at the base end 31, and when the winch 6 is further wound and driven, the moving body F moves on the boom holder 3 in the direction of the winch 6, and the multi-stage boom C , which moves in the direction of coming out of the boom holder 3. Note that 32 is a hook suspended from the tip of the multistage boom C.

Next, the process from removing the multistage boom C from the boom holder 3 to separating the swivel base B from the truck A will be explained.

First, the swivel base B is driven to swivel to direct the multistage boom C (indicated by the two-dot chain line) toward the rear of the truck A, as shown in FIG. A trailer (not shown) is placed below the multi-stage boom C in this state.

Next, the rope 28 from the winch 6 is connected to the moving body F.
After wrapping it around the pulley 26 as if turning it around, the end portion is fastened 29. From this state, when the winder 6 is driven in the winding direction of the rope 28, the multistage boom C comes out of the boom holder 3 via the ropes 30, 30. When the multi-stage boom C is extended to the maximum extent, the front end of the multi-stage boom C is supported by the trailer, but the base end of the multi-stage boom C is supported by the ropes 30, 30. When the fixing pin 15 is removed from this state, the protruding arms 8, 8 of the jack holder D rotate downward about the rotation fulcrum pin 13 and become suspended. In this state, the base ends of the jack holder D and the multistage boom C are separated from each other in plan view, so when the winch 6 is driven toward the rope 28 payout side, the base end of the multistage boom C is It can be placed on top. Next, the fastenings 31, 31 at one end of the rope 30 are released, the rope 30 is fastened to the protrusions 40 provided on the protruding arms 8, 8, and the winch 6
When driven in the winding direction of the rope 28, the jack holder D rotates toward the front side of the boom holder 3 around the rotation fulcrum pin 13, and the fixing holes 10, 10 and the holes 14, 14 are aligned. Since they overlap each other, in this state the fixing pin 15
By inserting the into these holes, the jack holder D will be created.
The boom holder 3 is projected forward and fixed. Next, the ropes 30, 30 and the protrusion 40,
40, and after moving the trailer, the rope ends of the ropes 30, 30 are placed on the ground below the jack holder D. The rope end fitting of the front jacking device E for supporting the swivel platform 24, 24
Attach to. After that, when the winch 6 is driven to the winding side of the rope 28, the front jacking device E for supporting the swivel table stands upright, and the upper surface of the contact arms 21, 21 becomes the lower surface 8' of the protruding arms 8, 8, 8', so in this state, insert the pins 26, 26 into the mounting holes 22,
22, by fitting into both the connecting holes 11, 11, a state in which the front jacking device E for supporting the swivel table is connected and fixed to the jacking holder D can be obtained.

Next, the front jacking device E for the swivel table support and the rear jacking device 7 for the swivel table support are pushed out and driven to bring the respective leg plates 20 and 7' into the ground state, and then the bearing 1 and the truck are connected. Then, the front jacking device E for supporting the swivel table and the rear jacking device 7 for supporting the swivel table are driven to lift the swivel table B upward. In this state, the swivel base B is
It becomes completely divided.

As described above, in the present invention, when the front jacking device for the swivel base support is connected and fixed to the jacking holder, a part of it is always in front of the tip of the boom holder. Since it occupies a position that intersects with the longitudinal direction,
With the multi-stage boom inserted into the boom holder,
This has an excellent practical effect in that the front jacking device for the swivel table support is not attached, and accidents such as damage to the front jacking device for the swivel table support can be prevented.

[Brief explanation of the drawing]

Fig. 1 is an overall view of the crane according to the first embodiment of the present invention, Fig. 2 is a partially enlarged perspective view of the crane shown in Fig. 1, and Fig. 3 is a turning view seen from the direction of arrow H in Fig. 1. This is a front jacking device for table support. 3: Boom holder, C: Multistage boom, D: Jacket holder, E: Front jack device for supporting the swivel base.

Claims (1)

[Scope of Claim for Utility Model Registration] A boom holder whose base end is pivotally supported on a swivel table so that it can be raised and lowered freely.A multi-stage boom is installed in the longitudinal direction of the boom holder so that it can be inserted and removed freely, and a jack holder is installed at the tip of the boom holder. A front jacking device for supporting the turning table and a rear jacking device for supporting the turning table are arranged at appropriate positions on the jack holder and the turning table, respectively, so that the turning table is supported by the extension of these jacking devices. The front jacking device for the swinging platform support of a crane is connected and fixed to the jack holder, and in the connected and fixed state, a part of it is connected to the tip of the boom holder. A jacking device for a crane swivel base support, characterized in that the jacking device is located at the front of the boom holder and intersects with the longitudinal direction of the boom holder.