KR200331467Y1 - cargo crane - Google Patents

Abstract

The present invention relates to a movable cargo crane that improves workability by expanding the vertical tilt angle of the boom unit, the movable cargo crane according to the present invention, the hydraulic motor 60 and the drive gear 64, the cap 10 And a fixed block 23 interposed between the space between the rotating column 31 or the space between the loading box 20 and the rotating column 31 to support the rotating column 31, thereby making it a fixed block. By applying the rotating column 31, the length of which is extended by the lowered height of 23, and the inclined cylinder 71 with the extended stroke, the tip is fixed downwardly without lowering the maximum upward rotation angle of the boom unit 40. It is made of structure that can be done.

Here, the hydraulic motor 60 is attached to the bottom surface of the pedestal 25 to support the rotating column 31 and partially protrudes toward the cap 10, the drive gear 64 is formed on the protruding portion of the pedestal 25 It is engaged with the driven gear 66 through the through hole 25a.

According to the movable cargo crane according to the present invention as described above it is possible to extend the stroke of the inclined cylinder without departing from the total height limit to lower the reference angle of the boom unit, it is possible to increase the stability when moving, and improve the work efficiency There is an advantage.

Description

Mobile Cargo Crane

The present invention relates to a mobile cargo crane, and more particularly to a mobile cargo crane is improved workability by expanding the vertical tilt angle of the boom.

In general, a mobile crane is integrally formed with a large vehicle such as a truck, and thus is movable as well as operated by engine power. The configuration of the mobile crane is a cap 10 that forms a vehicle driving space as shown in FIG. 1. ) And a moving element including the loading box 20 connected thereto, a work element driven for direct work, and a driving element for moving the work element.

The work element includes a rotating column 30 rotatably mounted on the fixed block 22 between the cap 10 and the loading box 20, and a boom unit connected to the upper end of the rotating column 30 so as to be rotatable vertically. (boom unit) 40, and the hook 50 is mounted to the boom unit (40).

The driving element is a hydraulic motor 60 for rotating the rotary column 30, the inclined cylinder 70 for the vertical movement of the boom unit 40, the winch 80 for moving the hook 50, etc. Consists of including.

Here, the hydraulic motor 60 is used to the type of the reducer 62 is integrally provided to increase the rotation torque, the connection structure of the hydraulic motor 60 and the rotary column 30 is connected to the reducer 62. The small diameter drive gear 64 is made to engage with the large diameter driven gear 66 at the bottom of the rotary column 30 (see FIG. 3).

In addition, the inclined cylinder 70 is composed of a cylinder rod and a piston rod retractably embedded in the cylinder portion, the lower end of the cylinder portion is rotatably fastened to one side of the rotary column 30, The upper end is mounted in such a way that it is rotatably connected to one end of the boom unit 40.

The boom unit 40 has a structure in which a plurality of booms having different diameters are combined, and a small diameter boom is sequentially drawn in or vice versa in the large diameter boom by a built-in hydraulic cylinder (not shown). It works.

Then, the hook 50 is mounted in the manner of hanging by the wire 52 to the front end of the boom unit 40, it is controlled by the wire winding action by the winch (80).

Here, the driving elements such as the hydraulic motor 60 and the inclined cylinder 70 are driven by receiving power from a hydraulic pump (not shown) for converting engine power into hydraulic power.

According to the conventional movable cargo crane as described above, the horizontal rotation operation of the rotary column 30 by the hydraulic motor 60, the vertical rotation operation of the boom unit 40 by the inclined cylinder 70, and each boom Combination of the height adjustment operation of the hook 50 through the length adjustment operation of the boom unit 40, the wire winding operation of the winch 80 through the withdrawal of, can carry out the movement of heavy materials such as construction materials, the hook In the case of mounting a riding bucket (not shown) instead of 50, an operator can ride in the riding bucket to perform various operations such as street light installation and repair, signage installation and washing.

In the conventional mobile cargo crane, the reference state of the boom unit 40, that is, the angle (reference angle) of the boom unit 40 and the horizontal plane in the state that the inclined cylinder 70 is as much as possible to maintain 0 °, This is described below.

First, the mobile cargo crane prevents deterioration of stability when moving due to excessively high center of gravity according to the manufacturing regulations, and meets height according to traction load in order to satisfy the conditions such as restrictions according to automobile regulations and height limit of work place. (L) That is, the overall height is limited.

In addition, in order to increase the working range of the cargo crane, it is preferable that the upward rotation angle α of the boom unit is large relative to the horizontal line, and the maximum rotation angle of the boom unit 40 is the length of the inclined cylinder 70, that is, the stroke. On the other hand, the stroke of the inclined cylinder 70 is limited to a degree similar to the rotational column 30 due to the mounting structure and the above-mentioned total limit.

In the conventional cargo crane, as shown in FIG. 2, the hydraulic motor 60 includes a pedestal 24 in a structure positioned below the pedestal 24 on the top of the fixed block 22 supporting the rotary column 30. The upper and lower lengths ℓ of the fixed block 22 must be sufficiently larger than the vertical length of the hydraulic motor 60 including the reducer 62, which attaches the hydraulic motor 60 to the fixed block 22 as shown in FIG. This is because a free space for inserting and removing the drive gear 64 through the through-hole 24a of the pedestal 24 when removing or removing it is required. This structural characteristic is the length of the rotating column 30 under the restriction of total height. And a reduction in the stroke of the inclined cylinder 70.

Therefore, in order to maximize the upward rotation angle α of the boom unit 40 under the condition that the stroke of the total height L and the inclined cylinder 70 is limited, the reference angle of the boom unit 40 should be made horizontal. will be.

On the other hand, according to the prior art in which the boom unit 40 is horizontal in this way, since the tip of the boom unit 40 is not stably fixed when the crane moves, the boom unit 40 and the hook 50 are shaken, thus driving stability. Will fall. Therefore, in order to prevent such a phenomenon, there is a problem that a cumbersome process such as fixing the hook 50 to the loading box 20 using a rope 54 or the like is required.

In addition, there is also a problem that there is a lot of inconvenience because the height of the tip of the boom unit 40 is higher than the stacking box 20 even when the transporting material is connected to the hook 50 or the operator boards the riding bucket.

Therefore, in order to solve such a problem, the tip of the boom unit 40 is lowered (minus the reference angle) without lowering the height L, thereby lowering the center of gravity and loading the tip of the boom unit 40 (20). It is preferable to be supported in contact with the stably, but in this case, the upward rotation angle of the boom unit 40 is reduced under the condition that the stroke of the inclined cylinder 70 is limited due to the position structure of the hydraulic motor 60 as described above. There is a problem that the utilization is reduced.

The present invention is devised to solve the above-mentioned conventional problems, and does not reduce the upward rotation angle of the boom unit, it is made of a structure that can be supported by loading the bottom of the boom unit is lowered to improve the movement stability and work convenience An object of the present invention is to provide a mobile cargo crane.

1 is a side view showing the structure of a conventional mobile cargo crane.

2 is an enlarged view of a portion A of FIG. 1 for showing a positional relationship between a rotary column and a hydraulic motor in a conventional mobile cargo crane.

Figure 3 is an exemplary view showing the assembly structure of the hydraulic motor in the conventional mobile cargo crane.

Figure 4 is a side view showing the structure of a mobile cargo crane according to an embodiment of the present invention.

5 is an enlarged view of a portion A of FIG. 4 showing an installation position of a hydraulic motor in a mobile cargo crane according to an embodiment of the present invention.

6 is an exemplary view showing a mounting structure of a hydraulic motor in an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

10: Cap 20: Stacking box

23: fixed block 25: stand

31: rotating column 40: boom unit

50: hook 52: wire

60: hydraulic motor 62: reducer

64: drive gear 66: driven gear

71: tilt cylinder 80: winch

The movable cargo crane provided to achieve the above object has a structure in which the height of a fixed block for supporting the rotating column is interposed between the hydraulic motor and the drive gear, the space between the cap and the rotating column or the space between the loading box and the rotating column. By consisting of, by applying a rotating column and the length of the inclined cylinder has a large stroke length as the lower height of the fixed block is made of a structure that can be fixed to the loading box to lower the front end without reducing the maximum upward rotation angle of the boom unit.

Here, the hydraulic motor is attached to the bottom surface of the pedestal that supports the rotation column and partially protrudes toward the cap side, the drive gear is engaged with the driven gear through the through hole formed in the protrusion of the pedestal.

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 4 to 6.

Mobile cargo crane according to an embodiment of the present invention, as shown in Figure 4, the hydraulic motor 60 and the drive gear 64 is made of a structure interposed in the space between the cap 10 and the rotation column 30. .

Here, the mounting structure of the hydraulic motor 60 and the drive gear 64 has a pedestal 25 having one end protruding toward the cap 10 and a through hole 25a (see FIG. 6) formed as shown in FIG. The hydraulic motor 60 is attached to the bottom of the protruding portion of the pedestal 25, and the driving gear 64 is engaged with the driven gear 66 by passing through the through hole 25a.

According to the present embodiment, since the hydraulic motor 60 does not need to form a clearance for mounting or removing the hydraulic motor 60 in the fixed block 23 supporting the rotary column 31, the fixed motor 23 is fixed. The block 23 has a structure in which its height, that is, its upper and lower lengths ℓ is reduced as compared with the conventional one, and in the state where the height L of the crane is kept the same as before, the reduced length of the fixed block 23 is reduced. It is possible to apply the rotating column 31 which has a length longer by a predetermined portion within the range and the inclined cylinder 71 whose stroke is larger.

Therefore, by applying the inclined cylinder 71 with a long stroke and positioning it lower than in the related art, in the fully contracted state of the inclined cylinder 71, that is, in the reference state, the tip of the boom unit 40 is downward (reference Angular minus structure). In such a structure in which the boom unit 40 is downward, the boom 42 of the boom unit 40 may be partially pulled out to be brought into contact with the storage box 20 so that the boom unit 40 may be stably supported.

In the state in which the inclined cylinder 71 with a long stroke is applied, the working range is not reduced because the upward rotation angle α of the boom unit 40 on the horizontal plane is not reduced as compared with the related art.

Therefore, the movable cargo crane according to the present embodiment as described above, as the front end of the boom unit 40 is kept downward when moving, as well as the overall center of gravity is lowered, the front end and the hook ( By allowing the 50 to be supported by the loading box 20, it is possible to maintain a stable fixed state without going through a cumbersome process of fixing the hook 50 using the rope 54.

In addition, even during operation, the front end of the boom unit 40 in a down state in a convenient way to hang the load on the hook 50, or the operator can easily ride in the riding bucket.

As described above, the movable cargo crane according to the present invention is capable of extending the stroke of the inclined cylinder without departing from the total height limit, thereby lowering the reference angle of the boom unit, increasing stability during movement, and improving work efficiency. That provides the advantage.

Claims (2)

A moving element comprising a cap forming a vehicle driving space and a loading box connected thereto; A work element including a rotating column rotatably mounted on a fixed block between the cap and the loading box, a boom unit connected to the upper end of the rotating column so as to be rotatable, and a hook mounted on the boom unit; Control gear integrated hydraulic motor for reducing the rotational column, drive gear connected to the driven gear which is driven by the hydraulic motor and attached to the lower end of the rotational column, the inclined cylinder for the up and down rotation of the boom unit, and the control of the hook Drive elements including winches, etc. for In the mobile cargo crane consisting of; Since the hydraulic motor and the drive gear are formed in a space between the cap and the rotating column or between the loading box and the rotating column, the height of the fixed block supporting the rotating column is low. A movable cargo crane that can be fixed to the loading box by lowering its tip without reducing the maximum angle of upward rotation of the boom unit by applying a rotating column that is longer in length by a lower height of the fixed block and an inclined cylinder with an extended stroke. The method of claim 1, The hydraulic motor is attached to the bottom of the pedestal to support the rotation column and partially protrude to the cap side, The drive gear is movable cargo crane, characterized in that the meshing with the driven gear through the through-hole formed in the protruding portion of the pedestal.