JP2004067298A - Self-operated attaching/detaching device for counter weight - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a self-operated attaching/detaching device for a counter weight capable of attaching/detaching a counter weight in a stable posture in a short time. <P>SOLUTION: The self-operated attaching/detaching device for the counter weight attaches and detaches the counter weight with respect to the rear part of an upper part swiveling body of construction machinery. The device is equipped with a bracket 3 backwardly prolonged to the rear part 1 of the upper swiveling body, a plurality of link members 6, 7 liftably provided on the bracket 3, a counter weight connection part connecting a hanging part 11 of the counter weight, and a hydraulic cylinder 4 lifting the link members 6, 7. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a counterweight self-attaching / removing device for a construction machine such as a hydraulic shovel or a crane.
[0002]
[Prior art]
The counterweight of the construction machine is configured to be attached to or detached from the rear end of the revolving frame of the upper revolving unit.With a self-propelled crane, the counterweight is removed when moving to the site and before work is performed. Is installed on site.
[0003]
A counterweight attaching / detaching device for this purpose is disclosed in, for example, Japanese Utility Model Laid-Open No. 3-18089 (see FIG. 9).
[0004]
This counterweight attachment / detachment device includes a sprocket 51 at a tip end of a piston rod 50a of a cylinder 50. One end of a chain 52 hung on the sprocket 51 is fixed to a rear portion of a revolving frame, and the other end is a counterweight 53. It is connected to the hanging portion 54a (or 54b). In addition, 55 is a counterweight support stand, and 56 is a frame of the upper swing body.
[0005]
At the time of lifting the counterweight, the posture of the counterweight 53 is inclined in the direction of arrow A by connecting the other end of the chain 52 to the hanging portion 54a on the side closer to the frame 56, and then the piston rod 52 is extended. The counterweight 53 is raised while sliding on the inclined surface 55a of the support base 55.
[0006]
On the other hand, at the time of hanging the counterweight, the other end of the chain 52 is connected to the hanging portion 54b farther from the frame 56 and hung so that the posture of the counterweight 53 is inclined in the direction opposite to the arrow A direction to receive the counterweight. The counterweight 53 is lowered to the ground by moving the surface 53a away from the support base 55 and then reducing the piston rod 52.
[0007]
[Problems to be solved by the invention]
However, in the above-described counterweight attaching / detaching device, since the counterweight 53 is hung by the chain 52, the counterweight 53 may swing around the chain 52 when the counterweight 53 is lifted or hung. There is a problem that the cylinder 50 must be operated slowly in order to move up and down. In addition, when the chain 52 is used as the suspending means, there is a problem that when the cylinder 50 is reduced, it is necessary to secure a storage space for the cylinder.
[0008]
The present invention has been made in consideration of the above-described problems in the conventional counterweight attaching / detaching device, and provides a counterweight self-attaching / removing device capable of stably attaching and detaching the counterweight in a short time. is there.
[0009]
[Means for Solving the Problems]
The present invention provides a counterweight attaching / detaching device for attaching / detaching a counterweight to / from a rear portion of an upper revolving structure of a construction machine, wherein a bracket extends rearward at a rear portion of the upper revolving structure, and a link member is provided on the bracket so as to be able to move up and down, This is a counterweight self-attaching / removing device in which a counterweight connecting portion for connecting a hanging portion of the counterweight is provided at a lower end portion of the link member, and an elevating means for raising and lowering the link member is provided.
[0010]
According to the present invention, since the counterweight is hung up and down by suspending the counterweight on a link member that does not cause bending or twisting, the posture of the counterweight can be stabilized, and thereby the counterweight can be quickly moved to the rear part of the upper revolving superstructure. Can be attached and detached.
[0011]
In the present invention, the link member is configured to be extendable and contractible by an upper link portion and a lower link portion connected below the upper link portion, and a counterweight connecting portion is provided at a lower end of the lower link portion. For example, when the counterweight is installed, the counterweight can be connected by extending the lower link portion to the counterweight placed on the ground, and when the counterweight is not attached / detached, the lower link portion is moved up and down by that length. It can be reduced in the direction and retracted.
[0012]
In the present invention, if the link members are arranged back and forth on both left and right sides, the front and rear link members are connected to each other with a connector, and one end of a hydraulic cylinder as a lifting / lowering means is connected to the connector, a counterweight self-powered attaching / detaching device is provided. It can be made compact. Further, each link member can be moved up and down evenly.
[0013]
In the present invention, by configuring the link member so as to be able to swing back and forth, a counterweight that is not accurately positioned in the front and rear direction can be moved up and down.
[0014]
In the present invention, if the bracket is configured to be detachable with respect to the rear portion of the upper revolving structure, the counterweight self-removable device can be attached to the upper revolving structure as needed, so that the frame of the upper revolving structure is shared. Will be able to do it.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings.
[0016]
FIG. 1 shows an embodiment of a counterweight self-attaching / removing device according to the present invention.
[0017]
In the figure, reference numeral 1 denotes a rear portion of an upper revolving superstructure of a construction machine.
[0018]
The counterweight self-attaching / removing device (hereinafter simply referred to as a weight attaching / detaching device) 2 has a box-shaped bracket 3 attached to the rear part 1 of the upper revolving unit. And a pin hole 3b for fixing the bracket 3 to the upper revolving unit rear portion 1 is provided in a lower portion on the front side of the side plate. In addition, 3c is a reinforcing plate.
[0019]
On the other hand, a pair of frames 1a, 1a (only the near side is shown) extend in parallel to the rear at the upper part of the upper revolving superstructure 1 on which the bracket 3 is mounted, and on the upper part of the frames 1a, 1a. A receiving portion 1b for receiving the mounting shaft 3a is formed. Therefore, if the pins are fixed through the pin holes 3b of the bracket 3 and the pin holes (not shown) formed in the frame 1a, the bracket 3 hung on the rear portion 1 of the upper revolving structure via the mounting shaft 3a is fixed. You can do it.
[0020]
The bracket 3 is provided with two hydraulic cylinders 4 and 4 (only the front side is shown) as lifting means on both sides in the vehicle width direction.
[0021]
The tube 4a of each hydraulic cylinder 4 is fixed to the bracket 3 at the vertical position, and 3d is a connection plate connecting the tube 4a and the bracket side plate.
[0022]
A balance-like connecting tool 5 is provided at the tip of a rod 4b extending upward from the hydraulic cylinder 4, and two links are suspended from the connecting tool 5.
[0023]
More specifically, a connecting tool 5 (only the near side is shown) is provided at a tip 4b 'of the rod 4b via a shaft 5a, and a link 6 (as a link member) is provided at both ends in the front-rear direction of the connecting tool 5 via pins 5b. A link 7 (shown only on the near side) as a link member is suspended via a pin 5c. Since each of the links 6 and 7 can swing back and forth, it is possible to lift the counterweight 10 described later even if the counterweight 10 is not accurately positioned in the front-back direction.
[0024]
Further, a link 6 and a link 7 are arranged in parallel on both sides of the hydraulic cylinder 4, and two links are similarly suspended from the hydraulic cylinder 4 on the back side. Therefore, as a whole, the links are arranged on the left and right (in the vehicle width direction) on both sides.
[0025]
Hereinafter, the configuration of the front hydraulic cylinder 4, the connecting tool 5, and the links 6 and 7 will be described as a representative.
[0026]
The link 6 is composed of a long upper link 6a and a lower link 6b formed shorter than the upper link 6a, and a long groove 6a 'is formed in the upper link 6a.
[0027]
FIG. 2 is an exploded view of the link 6, wherein (a) is a side view of the upper link 6a, (b) is a rear view of the lower link 6b, and (c) is a side view thereof. .
[0028]
The lower link 6b has an outer plate 6c and an inner plate 6d having the same shape. The upper ends of the plates 6c and 6d are connected by connection pins 6e, and the lower ends are connected by connection pins 6f. ing. However, it is assumed that the connection pin 6e is fixed to both plates 6c and 6d after being inserted into the long groove 6a 'of the upper link 6a.
[0029]
As described above, since the pin 5b of the connector 5 and the pin 6e of the lower link 6b can move within the long groove 6a 'of the upper link 6a, respectively, it is interlocked with the expansion and contraction of the hydraulic cylinder 4. Thus, the upper links 6a, 7a can be moved up and down, and the upper links 6a, 7a and the lower links 6b, 7b are extendable (see FIG. 1).
[0030]
On the other hand, it is assumed that the connection pin 6f is also inserted into a connection fitting 11 for connecting to a counterweight 10 described later.
[0031]
The portion of the lower link 6b into which the connection pin 6f is inserted functions as a counterweight connection.
[0032]
6g is a protruding piece for holding the lower link 6b to the bracket 3. When the lower link 6b is moved upward, a pin is passed through a through hole of the protruding piece 6g and the pin is inserted into the bracket 3. If fixed, the lower link 6b can be held in a reduced state.
[0033]
Returning to FIG.
[0034]
The link 7 also has the same configuration as the link 6 described above, has an upper link 7a and a lower link 7b, and can extend the lower link 7b downward. A projection 7g for holding the lower link 7b on the bracket 3 in a reduced state is also provided.
[0035]
Note that the required length of the links 6 and 7 is appropriately determined by the mounting height of the bracket 3 and the slot length of the hydraulic cylinder.
[0036]
A counterweight 10 is disposed below the weight attaching / detaching device 2. Although the counterweight 10 placed on the ground shown in the figure is shown only at the lowermost level so that the connection between the weight attaching / detaching device 2 and the links 6 and 7 can be seen, actually, the counterweight 10 is placed on both sides in the vehicle width direction. A plurality of counterweights 10a are stacked.
[0037]
On the upper surface of the counterweight 10, a pair of connecting fittings (hanging parts) 11 for connecting to the lower link 6b and the lower link 7b is attached in advance.
[0038]
In FIG. 3, the connection fitting 11 has a boss 11a connected to the lower end of the lower link 6b via a pin 6f, and a pair of legs 11c, 11c is further suspended from the boss 11a.
[0039]
Reference numeral 11b denotes a guide plate having a tapered surface for smoothly guiding the connection fitting 11 into the gap between the brackets 3 when the counterweight 10 is lifted.
[0040]
A suspending portion 10b protruding from the counterweight 10 is inserted into the gap between the two legs 11c, 11c, and the pin 12 is passed through the leg 11c and the suspending portion 10b to be fixed. 10 are connected.
[0041]
On the upper surface of the counterweight 10, a mounting plate 10c made of a ridge is formed parallel to the front-rear direction. The mounting plate 10c is provided with through holes 10c 'formed in a substantially triangular shape so that the pins can be easily positioned. When the counterweight 10 is lifted to the mounting position of the upper revolving unit rear portion 1, Then, if a pin is inserted and fixed into a through hole 10c 'of the mounting plate 10c and a through hole (not shown) provided in the frame 1a, the counterweight 10 is fixed to the bracket 3.
[0042]
Next, the operation of the weight attaching / detaching apparatus having the above configuration will be described with reference to FIGS.
[0043]
4 and 5 show the counterweight mounting operation. In FIG. 4, it is assumed that the hydraulic cylinder 4 is in the most contracted state.
[0044]
In FIG. 4A, first, the pins fixing the projections 6g, 7g of the lower links 6b, 7b and the bracket 3 are removed. This releases the lower links 6b, 7b from being fixed, and the lower links 6b, 7b descend along the long grooves 6a ', 7a' of the upper links 6a, 7a.
[0045]
In FIG. 3B, the lowered lower links 6b and 7b are connected to a connection fitting 11 connected to a hanging portion of the counterweight 10. Specifically, the bosses 11a, 11a of the connection fitting 11 and the lower ends of the lower links 6b, 7b are connected by pins.
[0046]
In FIG. 3C, the extra stroke S (L is the center of the rod end in the most contracted state) is extended by extending the piston rod 4b, and the lifting of the counterweight 10 is started.
[0047]
In FIG. 5D, after the hydraulic cylinder 4 is extended by a full stroke, the fixing pin 20 is inserted into and fixed to the mounting plate 10c and the frame 1a (see FIG. 1). The fixing pins 20 are attached to each of the mounting plates 10c at two places, that is, at four places in total.
[0048]
In FIG. 5E, the hydraulic cylinder 4 is slightly loosened from the full stroke (see S 'in the figure), and the counter weight 10 is held by the bracket 3.
[0049]
In FIG. 5 (f), the hydraulic cylinder 4 is contracted to its minimum position, and a rattle preventing bolt (not shown) that extends downward from the bracket 3 and prevents rattling of the counterweight is attached to complete the mounting of the counterweight 10.
[0050]
6 and 7 show the operation of removing the counterweight. It is assumed that the hydraulic cylinder 4 is in the most contracted state.
[0051]
In FIG. 6A, the backlash prevention bolt is removed.
[0052]
In FIG. 3B, the hydraulic cylinder 4 is extended by a full stroke, and then the fixing pins 20 fixed at four positions are removed.
[0053]
In FIG. 2C, the counterweight 10 is lowered by reducing the piston rod 4b of the hydraulic cylinder 4.
[0054]
In FIG. 7D, after separating the counterweight 10 from the lower links 6b, 7b, the hydraulic cylinders 4 are extended to raise the protruding pieces 6g, 7g of the lower links 6b, 7b to their fixed positions, Fix to the bracket 3 at the fixed position.
[0055]
In FIG. 5E, the hydraulic cylinder 4 is contracted, and the removal of the counterweight 10 is completed.
[0056]
FIG. 8 shows a method of attaching the above-mentioned weight attaching / detaching device 2 to the rear portion 1 of the upper-part turning body.
[0057]
In the figure, a pair of sheaves 30b, 30b (only the near side is shown) is disposed on the left and right sides of a front column 30a of the gantry 30. The sheaves 30b, 30b are attached above the weight attaching / detaching device 2 placed on the gantry 32.
[0058]
When lifting the weight attaching / detaching device 2, first, the lifting cylinders 33 are extended to the maximum. Next, one end of the rope 35 is connected to the connecting member 34 of each lifting cylinder 33, the rope 35 is hung around the sheave 30 b, and the other end is connected to the upper end 3 f of the bracket 3.
[0059]
In this state, the lifting cylinders 33 are gradually reduced. Next, the gantry 30 is slightly raised, and the weight attaching / detaching device 2 is pulled toward the rear side of the upper revolving unit. After confirming that the mounting shaft 3a of the bracket 3 has been lifted to a height exceeding the upper end of the rear edge portion 36, the elevating cylinders 33 are slightly extended, and the mounting shaft 3a is hooked on the receiving portion 1b. .
[0060]
According to this method, the weight attaching / detaching device 2 can be mounted on its own even when the gantry 30 is not upright.
[0061]
As described above, if the weight attaching / detaching device 2 is lifted using the gantry 30 and is fixed to the rear portion 1 of the upper revolving structure, and the weight attaching / detaching device 2 is used to attach / detach the counter weight, work relating to attaching / detaching the counter weight can be performed. You can do everything on your own. In the drawing, reference numeral 32 denotes a frame on which the weight attaching / detaching device 2 is mounted. For example, the frame 32 may use a car body weight extending from a lower traveling body.
[0062]
In the above embodiment, the lower links 6b, 7b are configured to extend from the upper links 6a, 7a so as to reach the hanging portion of the counterweight 10, but the lengths of the upper link 6a and the lower link 6b are reduced. It can also be constituted by one link having the added length. Further, if a link having two or more steps, for example, a link consisting of three steps is expanded or contracted, or a joint consisting of three steps is folded, the link member will be upward when the weight attaching / detaching device is attached to the upper rotating body. The amount of protrusion can be reduced.
[0063]
When the hanging portions of the counterweights protrude from the upper surfaces of the counterweights stacked in multiple stages, the counterweights 10 can be directly raised or lowered only by the upper links 6a and 7a.
[0064]
The lower links 6b and 7b can be provided with the same long grooves as the upper links for the purpose of weight reduction.
[0065]
Further, in the above-described embodiment, the pair of hydraulic cylinders 4 is disposed on the left and right. However, the present invention is not limited to this, and one hydraulic cylinder 4 may be disposed in the middle of the left and right links. The arrangement of the links 6 and 7 is determined in accordance with the direction of the boss 11a of the connection fitting 11.
[0066]
【The invention's effect】
As is apparent from the above description, according to the first aspect of the present invention, since the counterweight is lifted and lowered by suspending the counterweight on the link member having no bending or twisting, the posture of the counterweight can be stabilized. Thus, the counterweight can be attached to and detached from the rear portion of the upper revolving superstructure in a short time.
[0067]
According to the second aspect of the present invention, the counterweight can be connected by extending the lower link portion to the counterweight placed on the ground when the counterweight is mounted, and can be connected when the counterweight is not attached or detached. Since the link portion can be reduced and retracted, the overall height during transportation can be reduced.
[0068]
According to the third aspect of the present invention, since the link members are disposed on the left and right sides of the front and rear sides, the front and rear link members are connected to each other by the connection fitting, and one end of the hydraulic cylinder as the elevating means is connected to the connection fitting. The weight self-attaching / removing device can be made compact. Further, each link member can be moved up and down evenly.
[0069]
According to the fourth aspect of the present invention, it is possible to raise and lower a counterweight that is not accurately positioned in the front-rear direction.
[0070]
According to the fifth aspect of the present invention, since the bracket is configured to be detachable from the rear portion of the upper revolving structure, the counterweight self-removable device can be attached to the upper revolving structure as required, and The body frame can be shared.
[Brief description of the drawings]
FIG. 1 is a side view showing a configuration of a counterweight self-attaching / removing device of the present invention.
2A is an enlarged view of an upper link in FIG. 1, and FIGS. 2B and 2C are enlarged views of a lower link.
FIG. 3 is an enlarged view of a counterweight.
FIGS. 4A to 4C are process diagrams illustrating a counterweight mounting operation.
5 (d) to 5 (f) are process diagrams following FIG.
FIGS. 6A to 6C are process diagrams for explaining a counterweight removing operation.
FIGS. 7 (d) and (e) are process diagrams following FIG. 6;
FIG. 8 is a side view showing a mounting method of the counterweight self-attaching / removing device.
FIG. 9 is a side view showing a configuration of a conventional counterweight attaching / detaching device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Upper revolving superstructure rear part 1a Upper revolving superstructure frame 1b Receiving part 2 Counter weight self-removing device 3 Bracket 4 Hydraulic cylinder 4a Tube 4b Rod 5 Connecting tool 6, 7 Link 6a, 7a Upper link 6a ', 7a' Long groove 6b, 7b Lower Side links 6g, 7g Protrusions 10 Counterweights 10b Suspensions 10c Mounting plates 11 Connection fittings

Claims (5)

In a counterweight attachment / detachment device for attaching / detaching a counterweight to / from a rear portion of an upper revolving superstructure of a construction machine,
At the rear of the upper revolving structure, a bracket extends rearward, a link member is provided on the bracket so as to be able to move up and down, and a counter weight connecting portion for connecting a hanging portion of the counter weight is provided at a lower end of the link member. And a self-attaching / removing device for the counterweight, which is provided with elevating means for elevating the link member. The link member is configured to be expandable and contractible by an upper link portion and a lower link portion connected below the upper link portion, and the counterweight connection portion is provided at a lower end of the lower link portion. Item 2. The counterweight self-attaching / removing device according to Item 1. 3. The counter according to claim 1, wherein the link member is disposed forward and backward on both left and right sides, the front and rear link members are connected to each other by a connector, and one end of a hydraulic cylinder as the elevating means is connected to the connector. Weight self-removal device. The counterweight self-attaching / removing device according to any one of claims 1 to 3, wherein the link member is configured to swing back and forth. The counterweight self-attaching / removing device according to any one of claims 1 to 4, wherein the bracket is configured to be detachable from a rear portion of the upper rotating body.

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