JPH018469Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a counterweight mounting device for construction machines such as cranes and pile drivers.

Conventionally, the mounting structure for the counterweight in the above-mentioned construction machinery is a so-called mount structure in which a horizontal weight support is provided at the rear end of the base machine's upper revolving body, and the counterweight is placed and fixed on the support. is common. However, according to this conventional device, when attaching or removing a weight, there is no means for moving the weight up and down between the ground and a height position facing the weight support, and a means for moving the weight up and down between the weight support and the rear of the support. Since a means for moving the weight back and forth between positions is required, the equipment for attaching and detaching the weight becomes complicated or large-scale, and the operation of attaching and detaching the weight is also troublesome and inefficient.

SUMMARY OF THE INVENTION Therefore, the present invention aims to provide a counterweight mounting device for a construction machine that eliminates the need to move the counterweight back and forth and simplifies the equipment and operations for attaching and detaching the weight.

The present invention consists of a weight mounting frame provided at the rear end of the base machine, horizontal pins removably installed horizontally in the left and right directions on both sides of the lower part of the weight mounting frame, and A mounting bracket provided on the front surface and fixed to the horizontal pin, a bolt through hole provided above the mounting bracket and penetrating the counterweight back and forth, and a bolt inserted through the bolt through hole to hold the counterweight. A fixing bolt that is tightly fixed to the back of the mounting frame, and when the counterweight is installed, the counterweight is brought into close contact with the back of the weight mounting frame with the mounting bracket of the counterweight fixed to the horizontal pin of the weight mounting frame. The weight pressing means includes a weight pressing bracket provided on the weight mounting frame above the horizontal pin, and penetrating the counterweight back and forth in correspondence with the weight pressing bracket. a threaded rod through-hole provided, a threaded rod that is loosely inserted into the threaded rod through-hole and whose front end is movable up and down and removably connected to the weight pressing bracket, and a counterweight behind the screw rod. It consists of a nut that is screwed into the protruding part and applies a forward pressing force to the counterweight.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

A is a base machine, which consists of a lower running part _A1 and an upper rotating body _A2 . Reference numeral 1 designates the main frame of the upper revolving body A ₂ , with a main counterweight 2 at the rear of the main frame 1, a first auxiliary counterweight 3 at the rear, and a second auxiliary counterweight 4 at the rear (hereinafter, these will be referred to as the main counterweight). weight, first auxiliary weight, and second auxiliary weight) are provided. Both the first and second auxiliary weights 3 and 4 are used in addition to the main weight 2 according to an increase in the hanging load, and in this embodiment, the second auxiliary weight 4 in such a split type counterweight is used. An example will be described in which the present invention is applied as a structure for attaching to the back surface of the first auxiliary weight 3.

2nd auxiliary weight 4 along with main weight 2
The first auxiliary weight 3, which serves as the mounting frame, is placed on the weight support stand 1a provided at the rear end of the rotating body main frame 1, and is passed through the weight 3 and the main weight 2. It is fixed with two left and right fixing bolts 5, 5 and nuts 6, 6. This first auxiliary weight 3 includes
In addition to the bolt through holes 7, 7 through which the fixing bolts 5, 5 are inserted, threaded rods to be described later, which are used when attaching and detaching the weight 3, are inserted into three locations on both sides and in the center of the bolt through holes 7, 7. Threaded rod through holes 8, 9, and 10 are provided at both left and right ends for fixing the second auxiliary weight.
In addition, recesses 12, 12 are provided on the back side of the bottom surface of both left and right ends of the auxiliary weight 3, and pin boxes 13, 13 that open to the back side and the bottom side of the weight are fixed in the recesses 12, 12. Box 13,1
3, horizontal pins 14, 14 extending in the left-right direction are attached so as to be detachable from the outside of the weight.

On the other hand, the second auxiliary weight 4 is not directly supported by the rotating body main frame 1, but is attached to the vertical back surface of the first auxiliary weight 3. That is, this second auxiliary weight 4 has hook-shaped brackets 1 on the lower front part of both left and right ends.
5, 15 are provided protrudingly, and screw holes 11, 15 of the first auxiliary weight 3 are provided at both left and right ends of the intermediate height position.
Provide bolt through holes 16, 16 communicating with 11,
With the brackets 15, 15 engaged and fixed to the pins 14, 14 of the first auxiliary weight 3 as shown in FIGS. 3 and 4, the bolt through hole 1 is inserted as shown in FIG.
The second auxiliary weight 4 is closely attached to the back surface of the first auxiliary weight 3 by screwing fixing bolts 17, 17 inserted through holes 6, 16 into the screw holes 11, 11 of the first auxiliary weight 3. . When using this mounting structure, the basic effect is that for the second auxiliary weight 4, there is no need for a support stand to support the weight weight from below, such as the weight support stand 1a in the case of the first auxiliary weight 3. , when attaching and detaching the auxiliary weight 4, the weight 4
There is no need to move the support back and forth between the support position and the position directly behind it, and it is only necessary to move it up and down.

Pin 1 of the hook-shaped brackets 15, 15
The engaging surface 15a for the bracket 15 and the pin 14 is formed into a downwardly inclined surface as shown in FIG. That's what I do. Also, a first auxiliary weight 4 is placed in the center of the second auxiliary weight
A threaded rod passage hole 18 communicating with the central threaded rod passage hole 10 of the auxiliary weight 3 is provided.

Reference numeral 19 denotes a gantry provided on the main frame 1 of the revolving body, and is configured to be movable up and down by a front member 20 and a rear member 21 which is freely extendable and retractable. This gantry 19 has a peak guide sheave 22 at the peak portion and a front guide sheave 23 at the proximal end of the front member.
The tip of the weight is behind the first auxiliary weight 3 and is located almost directly above the second auxiliary weight 4 (the weight 4
It is configured to protrude to a position where it can be vertically moved up and down between a predetermined mounting height position and the ground. 24 is a frame for attaching the gantry front member.

Reference numeral 25 denotes a drum used when attaching and detaching the first and second auxiliary weights 3 and 4. Although the drum 25 may be installed in the upper revolving structure A ₂ exclusively for attaching and detaching the auxiliary weights, it is usually It is assumed that any one of the plurality of hoisting drums mounted on the rotating body _A2 is used. 26 is a wire rope pulled out from this drum 25, and the wire rope 26 is
When attaching and detaching the auxiliary weight, it passes from the front guide sheave 23 of the gantry 19 to the peak guide sheave 22, passes through the weight guide sheave 27 shared by both the first and second auxiliary weights 3 and 4, and then passes through the gantry peak guide sheave 22 again. Returning to , the terminal is fixed to the frame 24 with the rope socket 28 . In this way, a weight lifting means for vertically moving both the first and second auxiliary weights 3, 4 is constructed.

Next, the auxiliary weights 3 and 4 are lifted to a predetermined height position by the weight lifting means.
In the case of the first auxiliary weight 3, the device is pushed toward the weight support base 1a, and in the case of the second auxiliary weight 4, the means for bringing it into close contact with the first auxiliary weight 3 will be explained. The means includes, as a basic unit, a cylindrical bracket 29 as a member on the rotating body main frame side, a threaded rod 30 attached to this bracket 29, and a nut 31 screwed onto the threaded rod 30. be done. Bracket 29 is
At the intermediate height position on the back side of the main weight 2, the threaded rod through holes 8, 9,
It is stuck in three places corresponding to 10. The bracket 29 is provided with a pair of upper and lower L-shaped engagement grooves 29a, 29a, which open at the front end of the bracket, as shown in FIG. On the other hand, the threaded rod 30
A pair of engagement protrusions 30a, 30a are provided in the tip of the bracket 29 in a radial direction so as to protrude in the shape of a pair of engagement protrusions 30a, 30a, which are pulled into the engagement grooves 29a, 29a of the bracket 29. It is configured so that it can be hooked and engaged. This hook engagement is carried out by inserting the engaging protrusions 30a, 30a into the engaging grooves 29a, 29a from the distal end side in a vertical position as shown in FIG. This is done by holding the bracket in position and then pulling it towards the tip of the bracket. Thereby, the tip of the threaded rod 30 is attached to the bracket 29 so as to be rotatable up and down about the horizontal axis. Note that the threaded rod passage holes 8, 9, 10 of the first auxiliary weight 3 are formed to have a larger diameter than the cylindrical brackets 29, and when the weight is attached, the brackets 29...
I'm starting to get attached to it. Also, Natsuto 3
1 is provided with protrusions 31a radially on the outer periphery of the handle 3, and one of the protrusions 31a...
2 is installed.

Therefore, both the first and second auxiliary weights 3,
The mounting method of step 4 will be explained.

A. Attaching the first auxiliary weight 3 (a) As mentioned above, attach the drum 25, the gantry front guide sheave 23, the peak guide sheave 22,
The wire rope 26 passed through the weight guide sheave 27 attached to the first auxiliary weight 3 is wound up, and the first auxiliary weight 3 is moved from the ground position behind the weight support base 1a shown by the phantom line in FIG. Lift it up to the rear position of the support stand shown (slightly higher than the weight attachment position) and stop.

(B) In this state, insert the threaded rod 30 (only the through hole 8 side is shown in the figure) into the threaded rod through holes 8 and 9 on both sides of the weight 3, and insert the tip of the rod into the engaging protrusion as described above. 30a, 30a and the engagement groove 29a,
By engagement of 29a, the cylindrical bracket 29,
29 so that it can move up and down.

(c) By screwing a nut 31 onto this threaded rod 30 from the rear end side and tightening the nut 31 against the back side of the first auxiliary weight 3, the weight 3 can be moved as shown in FIG. The lower part is placed on the weight support stand 1a and is in a tilted state in contact with the main weight 2.

(d) In this state, loosen the wire rope 26 and
The auxiliary weight 3 is placed on the support base 1a, and the nut 31 is tightened again to bring the entire weight 3 into close contact with the back surface of the main weight 2 in a vertical position.

(e) After that, insert the left and right pair of fixing bolts 5, 5 into the bolt holes 7, 7 and 2a, 2a of the first auxiliary weight 3 and main weight 2, and tighten the fixing nuts 6, 6 on the front side of the main weight.
(as shown in Figure 7).

(F) Loosen the nut 31 and remove it from the threaded rod 30, remove the threaded rod 30 from the bracket 29, and pull it out from the first auxiliary weight 3,
The weight guide sheave 27 is removed from the weight 3, and the wire rope 26 is removed from the first auxiliary weight 3.

In addition, as mentioned above, the first auxiliary weight 3 is mounted on the base machine A (upper rotating body A ₂ ) as a lifting means for vertically moving the first auxiliary weight 3 between the ground and the height position facing the weight support base 1a. A threaded rod 30 and a nut 31 are used as a weight pushing means for pushing the lifted auxiliary weight 3 horizontally toward the support base 1a by using the drum 25, the wire rope 26 pulled out from the drum 25, and the gantry 19. Since the weight 3 is configured to be attached/detached, the weight 3 can be attached/detached with minimal simple equipment, and the weight 3 can be easily attached/detached by oneself without using a separate crane or the like. Also, threaded rod 3
0 to the bracket 29 so that it can move up and down around the horizontal axis, the first auxiliary weight 3
from the state shown in Fig. 5 facing the support stand 1a, to the state shown in Fig. 6 with the lower part on the support stand 1a, and then to the state shown in Fig. 7 when the installation is completed (during the device) or vice versa (during removal). In the process, the vertical of the weight 3 →
The threaded rod 30 can be changed to a posture that is always orthogonal to the weight 3 in accordance with the change in posture from tilt to vertical. That is, even if the auxiliary weight 3 is tilted, the weight weight does not directly act on the threaded rod 30, so that the tightening force and untightening force of the nut 31 can be small. Therefore, the first auxiliary weight 3 can be moved back and forth even more easily and smoothly. In addition, since the strength of the threaded rod 30 is small, the threaded rod 30 can be made with a small diameter, lightweight,
It can be made at low cost.

B. Attaching the second auxiliary weight 4 (a) When attaching the weight 4, first remove the pins 14, 14 from the pin boxes 13, 13 of the first auxiliary weight 3.

(b) After replacing the weight guide sheave 27 with the second auxiliary weight 4, wind up the wire rope 26 and move the weight 4 from the ground to a predetermined height position behind the first auxiliary weight, that is, as shown in FIG. Then, the hook-like brackets 15 on both sides are lifted up to a position slightly higher than the mounting position of the pin 14 inside the pin box 13 and stopped. In this state, the second auxiliary weight 4 is
It is closely opposed to the auxiliary weight 3 with a slight gap (to prevent interference with the first auxiliary weight 3 during lifting).

(C) At this position, insert one of the two threaded rods 30 used when attaching the first auxiliary weight into the central threaded rod through holes 10 and 18 of both auxiliary weights 3 and 4, and is attached to the bracket 29 at the center of the back of the main weight 2 so as to be movable up and down in the same manner as described above, and a nut 31 is screwed thereon.

(d) Pin boxes 1 on both sides of the first auxiliary weight 3
Attach pins 14 and 14 to 3 and 13. At this time, the hook-shaped bracket 15 of the second auxiliary weight 4 is not engaged with the pin 14.

(e) If you loosen the wire rope 26 in this state,
Inclined engagement surface 15a of hook-shaped bracket 15
contacts the pin 14 and slides forward, and is automatically positioned at a predetermined engagement position. Further, as a result, the entire second auxiliary weight 4 is tilted slightly backward as shown in FIG.

(f) Therefore, the nut 31 screwed onto the threaded rod 30
is tightened to bring the second auxiliary weight 4 into a vertical position and bring it into contact with the back surface of the first auxiliary weight 3.

(G) In this state, as shown in Fig. 2, insert the fixing bolts 17, 17 into the screw holes 1
1 and 11 to fix the second auxiliary weight 4, the threaded rod 30 is removed.

In the manner described above, the work of attaching both the first and second auxiliary weights 3 and 4 is completed. Moreover, both auxiliary weights 3 and 4 can be removed by performing the procedure and operation in reverse to the above.

As mentioned above, the second auxiliary weight 4 is not fixed on a support base, but is fixed on the back side of the first auxiliary weight 3 as the weight mounting frame. When using a mounting device, it is basically only necessary to move the weight 4 up and down when attaching and detaching the weight, and there is no need to move it back and forth in the case of a support stand-mounted type, so there is no need for equipment and operations for attaching and detaching the weight. This simplifies and streamlines the work of attaching and detaching the weight.

Moreover, in the above embodiment, the first auxiliary weight 3
The lifting means (vertical movement) of the drum 25 mounted on the base machine A (upper revolving structure A ₂ ), the wire rope 26 pulled out from the drum 25, and the gantry 19 are used to suspend the second auxiliary weight 4. Since it is also used as an upper means, the weight 4
There is no need to add any special equipment for vertical movement of the material, and there is no need to use a separate lifting machine such as a crane. Therefore, it is possible to further simplify the equipment and operation for attaching and detaching the weight, and to improve the efficiency of the attaching and detaching work.

Note that the present invention is not limited to the above-mentioned embodiments, and can be implemented with various modifications as follows.

(1) As a modification of the bracket 15 for fixing the lower left and right sides of the second auxiliary weight 4 to the first auxiliary weight 3 with pins 14, for example, the 11th
As shown in FIG. 1, a bracket 34 has a pin hole 33 that is closed to the lower opening of the bracket 15, that is, the engagement surface 33a for the pin 14 is an inclined surface, and has a long pin hole 33 in the front and rear and up and down directions;
Alternatively, a hook-shaped bracket 36 having a notch 35 which is long only in the vertical direction as shown in FIG.

(2) In the above embodiment, an example is given in which the second auxiliary weight 4 is attached to the back side of the first auxiliary weight 3 in a split counterweight consisting of a main weight 2 and both first and second auxiliary weights 3 and 4. As mentioned above, the present invention is applicable to (a) an auxiliary weight attachment device for a split type counterweight consisting of a main weight and one auxiliary weight, or (b) a device for attaching an auxiliary weight to a split type counterweight consisting of a main weight and one auxiliary weight, or (b) a device for attaching an auxiliary weight to a split type counterweight consisting of a main weight and one auxiliary weight, or (b) a device for attaching an auxiliary weight to a split type counterweight consisting of a main weight and one auxiliary weight; It can also be applied as a mounting device for weights. In the case of (a) above, the main weight becomes the weight mounting frame, and in the case of (b), the rotating body main frame 1 may be the same mounting frame, or a separate weight mounting frame is provided at the rear end of the main frame. It's okay.

As described above, according to the present invention, it is possible to simplify the equipment and operation for attaching and detaching the counterweight by eliminating the need to move the weight back and forth when attaching and detaching the counterweight, thereby reducing the equipment cost and attaching and detaching the weight. This can make work more efficient.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, and Fig. 1 is a side view of the counterweight installed state, and Fig. 2 is a side view of the counterweight installed.
3 is an enlarged sectional view taken along the line of FIG. 2, FIG. 4 is an enlarged sectional view taken along the line of FIG. 3, and FIG. 5 is an enlarged sectional view taken along the line of FIG.
FIG. 6 is a partial cross-sectional side view showing an initial stage in the installation process of the first auxiliary weight as an installation frame for the auxiliary counterweight; FIG. 6 is an enlarged side view showing the intermediate stage; FIG. Figures 8A and 8B are perspective views before and after connecting the threaded rod and bracket used to attach and detach the first and second auxiliary counterweights, and Figures 9 and 10 show the installation process of the second auxiliary counterweight. A partially sectional side view, and FIGS. 11A, 11B, and 11C are side views showing three modifications of the same weight mounting bracket. A...Base machine, _A2 ...Upper rotating structure, 1
...The main frame of the revolving body, 2...The main counterweight that constitutes the weight mounting frame,
3...the first auxiliary counterweight; 4...the second auxiliary counterweight to which the present invention is applicable;
14...Horizontal pin for mounting the weight, 15...Bracket, 17...Fixing bolt, 29...Bracket for weight pressing constituting weight pressing means, 30...Threaded rod, 31...For nut ,
18...Threaded rod through hole.

Claims (1)

[Scope of utility model registration request] A weight mounting frame provided at the rear end of the base machine, horizontal pins removably provided horizontally in the left and right direction on both left and right ends of the lower part of the weight mounting frame, and horizontal pins provided on the front part of the lower left and right sides of the counterweight. A mounting bracket that is fixed to the above-mentioned horizontal pin, a bolt through hole that is provided above the mounting bracket and passes through the counterweight back and forth, and a bolt that is inserted through the bolt through hole and that connects the counterweight to the back side of the weight mounting frame. a fixing bolt for fixing the counterweight in close contact with the weight mounting frame; and a weight pressing means for bringing the counterweight into close contact with the back surface of the weight mounting frame while the mounting bracket of the counterweight is fixed to the horizontal pin of the weight mounting frame when the counterweight is mounted. The weight pressing means includes a weight pressing bracket provided on the weight mounting frame above the horizontal pin, and a screw provided penetrating the counterweight back and forth in correspondence with the weight pressing bracket. A rod through hole, a threaded rod that is loosely inserted into the screw rod through hole and whose front end is movable up and down and removably connected to the weight pressing bracket, and a portion of this screw rod that protrudes to the rear of the counterweight. 1. A mounting device for a counterweight in a construction machine, comprising a nut that is screwed in and applies a forward pressing force to the counterweight.