JPH0612064Y2 - Mobile counterweight device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a mobile counterweight device attached to a self-propelled construction machine such as a pile driver or a crane vehicle.

(Prior Art) In a self-propelled construction machine or the like, in order to balance the entire vehicle body in the front-rear direction, a counterweight that balances the load load acting on the front part of the vehicle body is attached to the rear part of the vehicle body. A mobile counterweight device has been conceived in which the counterweight can be moved back and forth according to increase and decrease.

This type of mobile counterweight device includes a counterweight movably supported between a front position approaching the vehicle body and a rear position away from the vehicle body, and a drive means for moving the counterweight between the two positions. A conventional device of this type is, for example, Japanese Patent Publication No. 45-31580 and Japanese Utility Model Publication No. 49-43790.
As described in Japanese Unexamined Patent Publication, a slide guide rail is continuously provided in front of the counterweight, and a support means for supporting the slide guide rail so as to be movable in the front-rear direction is provided on the vehicle body side. It is movably supported, and the counterweight is configured to be moved back and forth by a fluid pressure cylinder that directly connects the counterweight and the vehicle body side.

(Problems to be solved by the invention) In the movable counterweight device as described above, a large slide guide rail that is sufficiently longer than the forward and backward movement stroke of the counterweight and can support the counterweight in a cantilevered state is provided. Since the slide guide rails are continuously provided in front of the counterweight and the slide guide rails are supported by the support means on the vehicle body side, the front and rear movement space of the long and large slide guide rails is secured on the vehicle body side. It has to be. In addition, a long fluid pressure cylinder having the same extension / contraction stroke as the counterweight moving stroke is required, and a large front-rear space in which the cylinder enters the rear portion of the vehicle body must be secured.

However, in recent years, self-propelled construction machines and the like that require this type of counterweight device tend to design the entire machine as compactly as possible. Since the devices are centrally arranged, it is very difficult to secure a large space in the front-rear direction in which the slide guide rail and the cylinder as described above enter.

(Means for Solving the Problems) In order to solve the above conventional problems, the present invention provides
A guide rail continuously provided from the vehicle body, and a counterweight movably supported by the guide rail between a front position approaching the vehicle body and a rear position away from the vehicle body,
Drive means for moving the counterweight between the two positions, wherein the drive means connects the vehicle body side and the counterweight with a center-folded two-link, and opens and closes the center-folded two-link. And a cylinder for pushing and pulling the counterweight, and when the counterweight is moved to the front position by closing the center-folding double link, a recess into which substantially the whole center-folding double link is inserted. The present invention proposes a mobile counterweight device in which an entrance is formed on the rear side of the counterweight.

(Embodiment) An embodiment of the present invention will be described below with reference to the attached exemplary drawings.

In FIG. 1, reference numeral 1 is a vehicle body of a self-propelled construction machine equipped with a traveling crawler 2, and is provided in front of a swivel base 4 equipped with a driver's cab 3 etc., for example, a leader 5 for a pile driving device, etc. And a movable counterweight device 6 according to the present invention is arranged at the rear of the swivel base 4. The counterweight 7 in the mobile counterweight device 6
Is supported by the guide rail 8 so as to be movable back and forth between a front position A close to the vehicle body (swivel base 4) and a rear position B rearward from the vehicle body (swivel base 4). The guide rail 8 is composed of a fixed rail portion 9 supporting the counterweight 7 in the front position A and a foldable movable rail portion 10 supporting the counterweight 7 in the rear position B.

As shown in FIG. 2 to FIG. 4, the pair of left and right guide rails 8 are arranged side by side, and the fixed rail portion 9 of each guide rail 8 is provided in the left and right lateral directions attached to the rear end of the swivel base 4. The movable rail portions 10 are provided so as to project from the base material 11 rearward and in parallel with each other, and the movable rail portions 10 are provided at the free ends of the fixed rail portions 9.
, Each of which is horizontally rotatably connected by a vertical support shaft 12. Reference numeral 13 is a stopper attached to the outer side of the free end of each fixed rail portion 9, and as shown by the solid line in FIG. 3, the movable rail portion 10 is rotated outward to the working position X for extending the fixed rail portion 9. When the movable rail portion 10 is moved, the protruding portion 14 formed on the outer side of the base portion of the movable rail portion 10 is configured to abut the stopper 13.

As shown in FIG. 6, the free ends of the two movable rail portions 10 are respectively rotated inward to the storage position Y, which is a direction substantially perpendicular to the fixed rail portion 9. , The connecting eye plates 15a, 15 overlapping each other
The movable rail portion 10 can be fixed to the storage position Y by inserting the connecting pin 16 into the pin holes of the connecting eye plates 15a and 15b overlapping each other.

The fixed rail portions 9 and the movable rail portions 10 of the two guide rails 8 are angled along the lengthwise direction so that the movable rail portions 10 continue in a straight line when in the operating position X. Bar-shaped rail members 17 and 18 are laid.

The counterweight 7 has two guide rails 8
Slide shoes 19 slidably fitted to the rail members 17 and 18 of the above are attached to the bottom surface in the vicinity of both left and right ends, and left and right of a protruding portion 20 that protrudes below the guide rails 8 in the middle of both guide rails 8. The fixing means 21 is attached to both ends. As shown in FIGS. 7 and 8, the fixing means 21 includes a lock pin 24 which is fitted in a cylindrical guide 23 fixedly provided on a base plate 22 so as to be rotatable and axially slidable, and the lock pin 24. 24, and an operating rod 26 having one end fixed to 24 and penetrating a U-shaped guide groove 25 formed in the cylindrical guide 23. On the lower side of the portion 10, fixed plates 27 and 28 having pin holes 27a and 28a into which the lock pin 24 can be fitted are fixedly projected. The board 22 is bolted with the upper side portion fitted from below to the positioning rail members 29 fixed to the left and right end surfaces of the counterweight protruding portion 20. However, after the operating rod 26 is pivoted upward so as to be separated from the inner downward concave portion 25a of the U-shaped guide groove 25, it is outwardly moved to a position directly above the outer downward concave portion 25b, whereby the lock pin is moved. 24 is a cylindrical guide 2
3. The fixing plates 27 and 28 at the opposite positions are moved by projecting from 3.
Can be fitted into the pin holes 27a and 28a. Then, the operating rod 26 is pushed downward to push the outer downward concave portion 25.
The lock pin 24 can be fixed to the projecting position by fitting the lock pin 24 in b. On the contrary, when the operating rod 26 is operated, the lock pin 24 is retracted into the cylindrical guide 23 to be disengaged from the pin holes 27a and 28a of the fixing plates 27 and 28, and the lock pin 24 is moved to the retracted position. It can be fixed.

Counterweight lifting prevention rail members 30 are detachably bolted to the inner sides of the lower portions of the fixed rail portions 9 and the movable rail portions 10 of both guide rails 8 along the length direction. A position where the rail member 30 covers the free end portion of the cylindrical guide 23 of the fixing means 21 and the free end portion of the cylindrical body 31 which is fixedly projected on the substrate 22 in parallel with the cylindrical guide 23. When the counterweight 7 tries to float up from the guide rail 8 due to vibration or the like, at least one of the free end portion of the cylindrical guide 23 and the free end portion of the cylindrical body 31 is the rail member. It is configured to prevent the slide shoe 19 from coming off from the rail members 17 and 18 by coming into contact with the bottom portion 30 and lifting the counterweight 7.

As shown in FIGS. 2 and 3, in order to move the counterweight 7 between a front position A and a rear position B,
Driving means 32 is provided. This drive means 32 is
The first center fold 2 disposed at the center position between both guide rails 8 and interposed between the swivel base 4 and the counterweight 7.
A connecting link 33, and a second intermediate-folding two-link 41 that is interposed between the first intermediate-folding two-link 33 and the swivel 4.
It is composed of the fluid pressure cylinder 34 for opening and closing the first center-folded double link 33. The first center-folded double link 33 has one end pivotally supported by a support shaft 36 at the lower ends of a pair of left and right bearing plates 35 fixed between the base 11 and the swivel 4. The other end of the pair of left and right links 37 and the other end of the pair of left and right links 39 whose one end is pivotally supported on the counterweight 7 side by a support shaft 38 so as to be vertically swingable relative to each other by a support shaft 40. It is connected to the shaft as much as possible. The second center-folded double link 41 has the other ends of a pair of left and right links 43 whose one end is pivotally supported by a support shaft 42 on the upper ends of the pair of left and right bearing plates 35, and the link 37. A pair of left and right links 45 each of which has one end pivotally supported by a support shaft 44 so as to be vertically swingable at a position near the support shaft 40 and the other end of which is pivotally connected by a support shaft 46 so as to be relatively swingable. There are a pair of left and right links 37, 39, 4 respectively.
5, the rear end portion of the cylinder body of the fluid pressure cylinder 34 is supported by the central support shaft 46 of the center-folding double link link 41 for supporting the cylinder, and the tip end portion of the piston rod of the cylinder 34 is A support shaft 47 is provided at a position near the support shaft 38 of the link 39 in the center-folded double link 33.
It is supported by.

As shown in FIG. 3 and FIG. 5, a recessed portion in which the deepest portion reaches a substantially central position in the front-rear direction length of the counterweight 7 at the rear side portion in the center portion in the left-right width direction of the counterweight 7. 48 is formed, and at the deepest portion of the recessed portion 48, at a position slightly lower than the support shaft 36 that pivotally supports the link 37 of the first center-folded double link 33, the first center-folded double link 33. A support shaft 38 that supports the above-mentioned link 39 is supported. The pair of left and right links 43 of the second center-folded double link 41 has the second center-folded double link 41.
As shown in FIG. 2, a stopper 49 is attached which abuts against the abutting portions 45a of the other pair of left and right links 45 to prevent further opening when it opens a predetermined angle. Further, the pair of left and right links 43 are connected and integrated with each other by a connecting plate 50 above the stopper 49.

In the movable counterweight device 6 configured as described above, as shown in FIGS. 2 and 3, the movable rail portions 10 of both guide rails 8 are pivoted outward around the support shaft 12. Then, in the state where the counterweight 7 is set in the linearly continuous working position X with respect to the fixed rail portion 9, the counterweight 7 is guided by the slide shoe 19 and the square bar-shaped rail members 17 and 18 at the bottom of the counterweight 7. It is possible to slide between the front position A and the rear position B on the position 8. However, when the load applied to the front portion of the swivel base 4 is light, the counterweight 7 as shown by the solid line in FIG.
Is set to the front position A, and when the load is heavy, the counterweight 7 is set to the rear position B as shown by the phantom line in FIG.
The forward and backward movement of the is performed by the drive means 32 as shown in FIGS. 2 and 5.

That is, as shown in FIG. 2, the counterweight 7 is moved from the fixed rail portion 9 of the guide rail 8 to the movable rail portion 10 by extending the fluid pressure cylinder 34 and opening the first center-folded double link 33. The first center-folding double link 33 that is opened can be pushed out and moved upward, and conversely, as shown in FIG. 5, the fluid pressure cylinder 34 is contracted to move the first center-fold double link 33. By moving the counterweight 7 from above the movable rail portion 10 of the guide rail 8 to the fixed rail portion 9
It can be pulled up and moved by the first center-folding double link 33 that moves upward.

With the opening / closing movement of the first center-folded double link 33, the second center-folded double link 41 is also opened / closed.
That is, when opening the first center-folded double link 33,
As shown in FIG. 2, the second center-fold double link 41 is pulled by the link 37 to open, and the position of the central support shaft 46 that supports the rear end of the cylinder body of the fluid pressure cylinder 34 is the lower end support shaft of the link 37. 36 (that is, the first center-folded two-link 3
It will descend so as to approach the vehicle body side support shaft (3).
Further, when the first center-folded double link 33 is closed, the second center-folded double link 41 is set to the link 3 as shown in FIG.
The central support shaft 46, which supports the rear end of the cylinder body of the fluid pressure cylinder 34, is closed by the link 37.
The lower end of the shaft 36 rises away from the support shaft 36.
Therefore, as shown in FIG.
Is in the closed limit position, the center line of the fluid pressure cylinder 34 (an imaginary line connecting the support shafts 46 and 47) 34a is linked to the link 3
7, it passes through the substantially central position, and even when the first center-folded double link 33 is at the open limit position as shown in FIG.
The center line 34a of the fluid pressure cylinder 34 passes from the support shaft 40 side to a position of about 1/4 of the effective length of the link 37, and the center line 34a comes too close to the support shaft 40. Can be avoided.

As shown in FIG. 5, when the first center-folding double link 33 is closed to the closing limit and the counterweight 7 is moved to the front position A supported by the fixed rail portion 9,
Approximately half of the first center-folded double link 33 and the fluid pressure cylinder 34 in the drive means 32 enter the recess 48 of the counterweight 7. The first center fold 2
The closing limit position of the connecting link 33 is determined by the contraction limit of the fluid pressure cylinder 34, but another stopper may be provided. In addition, as shown in FIG.
3 is opened to move the counterweight 7 to the rear position B supported by the movable rail portion 10, the second center folding double link 41 contacts the stopper 43 on the link 43 side on the link 45 side. It reaches the opening limit of contact with the portion 45a, and stops further opening of the first center-folded double link 33. That is, the stopper 49 serves as a stopper for determining the opening limit position of the first center-folded double link 33, but the stopper may be provided at another position.

When the counterweight 7 is moved to the front position A or the rear position B as described above, the lock pins 2 of the pair of left and right fixing means 21 provided on the counterweight 7 are moved.
4 is opposed to the pin hole 27a of the fixed plate 27 or the pin hole 28a of the fixed plate 28 on the guide rail 8 side.
Move the lock pin 24 to project in the same manner as described above,
The counterweight 7 can be fixed at the front position A or the rear position B by fitting into the pin hole 27a of the fixed plate 27 or the pin hole 28a of the fixed plate 28 on the guide rail 8 side. Therefore, the supply of the pressure fluid to the fluid pressure cylinder 34 can be cut off and made free. Of course, when the counterweight 7 is moved back and forth by the driving means 32, the lock pin 24 of the fixing means 21 is moved from the pin hole 27a of the fixing plate 27 on the guide rail 8 side or the pin hole 28a of the fixing plate 28 prior to that. I have to get rid of it.

As shown in FIG. 5, if the counterweight 7 is moved to and fixed at the front position A supported by the fixed rail portion 9 of the guide rail 8, as shown in FIG. The movable rail portion 10 is rotated inward to the storage position Y, which is in a direction substantially perpendicular to the fixed rail portion 9, and the connecting eye plates 15a, 1a are overlapped with each other.
Both movable rail portions 10 can be fixed to the storage position Y by inserting the connecting pin 16 into the pin hole of 5b. In this state, the entire guide rails 8 enter the lower side of the counterweight 7 in plan view, and the rearward protruding portions are substantially eliminated.

The drive means 32 for moving the counterweight 7 back and forth between the front position A and the rear position B is not limited to that of the above embodiment. For example, the second broken center double link 41
Omitting, both links 37 of the first broken center double link 33,
The fluid pressure cylinder 34 may be directly interposed between 39, or an electric cylinder may be used instead of the fluid pressure cylinder 34.

Further, the guide rail 8 is not limited to the configuration of the above embodiment, and for example, the fixed rail portion 9 and the working position X can be used.
It is also possible to use a single fixed rail that is integrated with the movable rail portion 10 in the above, or to make the slide guide rails continuously connected forward from the counterweight 7 movable by the support means on the rear side of the vehicle body. It can also be configured to support.

(Operation and Effect of the Invention) As described above, according to the movable counterweight device of the present invention, the guide rail for supporting the counterweight so as to be movable back and forth is continuously provided from the vehicle body. , It is not necessary to secure a large space for the large and long slide guide rail that supports the counterweight in a cantilever manner at the tip to move back and forth.

The driving means for moving the counterweight back and forth is composed of a center-folded double link connecting the vehicle body side and the counterweight, and a cylinder for opening and closing the center-fold double link to push and pull the counterweight. Since it is configured, the expansion and contraction stroke of the cylinder can be enlarged by the center-folded double link and transmitted to the counterweight. Therefore, it is possible to use a small cylinder having a relatively short expansion / contraction stroke. Moreover, when the counterweight is moved to the front position by closing the center-folded double link, a recessed portion into which substantially the whole of the center-folded double link is inserted is formed on the rear side of the counterweight. Therefore, in combination with the fact that a small cylinder can be used as described above, the portion of the driving means that enters the vehicle body side from the front-back movement region of the counterweight can be made very small or can be almost eliminated.

For the above reasons, it is substantially unnecessary to secure a large space for mounting the mobile counterweight device in the rear part of the vehicle body. Therefore, the mobile counterweight device of the present invention is a small self-propelled type. It can be easily and easily installed and used on construction machinery.

[Brief description of drawings]

FIG. 1 is a schematic side view showing a use state, FIG. 2 is a side view showing a mobile counterweight device, FIG. 3 is a plan view of the same, FIG. 4 is a front view of a cutout of the same portion, and FIG. 5 is a counter. Vertical side view with the weight moved to the front position,
FIG. 6 is a partially cutaway plan view showing a state in which the counterweight is moved to the front position and the guide rail is folded, FIG. 7 is a vertical sectional side view of the fixing means, and FIG. 8 shows the fixing means and the guide rail. It is a vertical front view shown. 4 ... Revolving base (car body), 6 ... Mobile counterweight device, 7 ... Counterweight, 8 ... Guide rail, 9 ... Fixed rail part, 10 ... Movable rail part,
12 ... Vertical support shaft for movable rail partial support, 17, 18 ...
… Square bar rail material, 19 …… Slide shoe, 21 ……
Fixing means, 32 ... Driving means, 33 ... First center-folded double link, 34 ... Fluid pressure cylinder, 41 ... Second center-folded double link.

Claims (1)

[Scope of utility model registration request] 1. A guide rail continuous from a vehicle body, a counterweight movably supported by the guide rail between a front position approaching the vehicle body and a rear position away from the vehicle body, and the counterweight. Driving means for moving the counterweight between the two positions, and the driving means opens and closes the center-folded double link connecting the vehicle body side and the counterweight, and opens and closes the center-folded double link to open the counterweight. When the counterweight is moved to the front position by closing and moving the center-folding double link, the center-folding 2
A movable counterweight device, wherein a recessed portion into which substantially the entire link and the like enter is formed in the rear side portion of the counterweight.