US20020062586A1 - Device for attaching and detaching a counterweight of construction machine - Google Patents
Device for attaching and detaching a counterweight of construction machine Download PDFInfo
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- US20020062586A1 US20020062586A1 US09/991,645 US99164501A US2002062586A1 US 20020062586 A1 US20020062586 A1 US 20020062586A1 US 99164501 A US99164501 A US 99164501A US 2002062586 A1 US2002062586 A1 US 2002062586A1
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- counterweight
- telescoping
- support bed
- telescoping device
- upper rotating
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/18—Counterweights
Definitions
- the present invention relates to a device for attaching and detaching a counterweight of a construction machine.
- a counterweight (hereinafter sometimes referred to as CW) of a construction machine is normally placed on a support bed projected horizontally from a rear end of a rotating frame of an upper rotating body.
- the CW is secured to the support bed by means of fixing bolts.
- the CW is removed when the construction machine is transported, and mounted when working.
- the CW has to be lifted or suspended so as not to interfere with the support bed.
- a method for attaching and detaching a counterweight disclosed in Japanese Patent Application Laid-Open No. Hei 7-324354 is known.
- a construction machine 80 is gone up to an inclined bed 81 to incline an upper rotating body 88 .
- an upper portion 84 a of a boom 84 and an upper surface portion 85 a of CW 85 are connected by a wire rope 87 through a sheave 86 a provided on an upper end of a mast 86 , and the fixing bolts are removed.
- the CW 85 is hung down from the sheave 86 a by gravity, and the CW 85 is moved away from the support bed 89 .
- the construction machine having a device for attaching and detaching a counterweight according to the present invention has the following constitution.
- the present invention comprises a lower traveling body; an upper rotating body mounted rotatably on the lower traveling body, the upper rotating body having a support bed standing out from a rear portion thereof; an attaching and detaching device for attaching and detaching a counterweight mounted on the support bed.
- the attaching and detaching device comprises a telescoping device having a lower end pivotally connected in the vicinity of the support bed, a restiform body hung down through a guide portion provided on the telescoping device, and oscillating means for oscillating the telescoping device around the lower end as fulcrum.
- the oscillating means displaces the telescoping device extended from a substantially vertical attitude to an inclined attitude when the counterweight is removed or moved downward.
- the counterweight when the telescoping device is expanded or contracted, the counterweight can be raised or fallen through the restiform body hung down from the guide portion.
- the counterweight When the telescoping device is displaced from a substantially vertical attitude to an inclined attitude by the oscillating means, the counterweight can be moved to a position not to interfere with the support bed or the counterweigh can be moved upward of the support bed without interfering with the support bed. Because of this, the counterweight can be attached or detached from the support bed by its own exertions and quickly.
- FIG. 1 is a front view showing the constitution of a device for attaching and detaching a counterweight according to one embodiment of the present invention
- FIG. 2 a is a front view showing, in an enlarged scale, the constitution of an expansion and contraction arm as telescoping devices according to the device of FIG. 1, and FIG. 2 b is a right side view thereof;
- FIG. 3 is an enlarged view of a chain fixing portion shown in FIG. 1;
- FIG. 4 is a sectional view taken on A-A of FIG. 2 b;
- FIG. 5 is a sectional view taken on B-B of FIG. 2 b;
- FIG. 6 is a schematic view showing a mounting state of a hydraulic cylinder 17 shown in FIG. 1;
- FIG. 7 a is a plan view showing the constitution of a counterweight 3 shown in FIG. 1, and
- FIG. 7 b is a sectional view taken on C-C thereof.
- FIGS. 8 a and 8 b are respectively schematic views showing a conventional method for attaching and detaching a counterweight.
- FIG. 1 shows one embodiment of a device for attaching and detaching a counterweight according to the present invention.
- an upper rotating body 2 is mounted rotatably on a lower traveling body having a crawler 1 mounted thereon.
- a support bed 2 a for placing a CW 3 thereon is stood out in a horizontal direction from a rear end of the upper rotating body 2 .
- the CW 3 placed on the support bed 2 a is formed, in its central portion, with a depressed groove 3 a from a planar view thereof.
- Telescoping arms 4 as a pair of telescoping devices are stood upright within the depressed groove 3 a (only a telescoping arm 4 near side is shown).
- FIGS. 2 a and 2 b show the constitution of the telescoping arm 4 in an enlarged scale. Particularly, FIG. 2 a is a front view thereof, and FIG. 2 b is a right side view thereof.
- the telescoping arm 4 has an outer tube 4 a and an inner tube 4 b which slidably moves within the outer tube 4 a .
- the lower end of the outer tube 4 a is connected through a connecting pin 7 to a bearing 6 stood upright in parallel from a floor plate 5 .
- a box 4 c is secured to the upper end within the inner tube 4 b .
- a rotational shaft 9 is inserted so as to extend through the box 4 c in a horizontal direction.
- Sprockets 11 as a guide unit are rotatably mounted on opposite ends of the rotational shaft 9 through a bearing unit 10 .
- a hydraulic cylinder 8 is inserted into the inner tube 4 b .
- a tube lower end 8 a of the hydraulic cylinder 8 is connected to the connecting pin 7 .
- An end 8 b of a rod is connected to the rotational shaft 9 .
- a reinforcing ring 4 d is wound around the upper end of the outer tube 4 a .
- One end of the chain 12 as a restiform body is secured to the reinforcing ring 4 d .
- a mounting fitting 13 is secured to the side wall of the reinforcing ring 4 d .
- One end of the chain 12 is secured to a coupling 14 provided on the mounting fitting 13 .
- the chain 12 is hung down turning down the sprockets 11 , and the other end thereof is connected to the upper part of the CW 3 . It is noted that the overall length of the chain 12 is set to a length enough to move down the CW 3 removed from the support bed 2 a on the ground.
- the restiform body is constituted by a chain
- the guide unit is engaged with the chain
- the mounting fitting 13 is connected to one end of the chain 12 while being displaced somewhat rearward.
- the amount of engagement of the chain 12 with respect to the sprockets 11 is increased.
- the telescoping arm 4 is contracted in the state that the CW 3 is removed and the chain 12 loses tension, the amount of engagement is kept increased. Accordingly, the chain 12 is hard to be disengaged from the sprockets 11 .
- FIG. 4 is a cross-section view taken on A-A of FIG. 2 b .
- An inner tube 4 b having a square in section is housed in an outer tube 4 a having a rectangular shape in section.
- the inner tube 4 b is supported by a pair of sliders 15 a secured to the outer tube 4 a by a bolt 15 .
- the inner tube 4 b slides smoothly with the sliders 15 a as a guide unit.
- FIG. 5 is a cross-section view taken on B-B of FIG. 2 b .
- Side walls on the machine side of both the outer tubes 4 a are connected by a connecting plate 15 .
- a pair of brackets 15 b projected in parallel from the connecting plate 15 are arranged between both the outer tubes 4 a .
- Numeral 16 denotes a housing box mounted on the lateral side wall of the outer tube 4 a to house the chain 12 removed from the CW 3 .
- brackets 15 b To the brackets 15 b is connected an end 17 a on the rod side of a hydraulic cylinder 17 as oscillating means shown in FIG. 6 through a first pin 18 .
- a tube lower end 17 b of the hydraulic cylinder 17 is connected to a bearing 19 provided on a floor plate 5 through a second pin 20 . Accordingly, when the hydraulic cylinder 17 is contracted, the telescoping arm 4 can be displaced from a substantially vertical position (a position indicated by the solid line of FIG. 1) to an inclined position inclined by ⁇ ° (a position indicated by the chain double-dashed lines in FIG. 1).
- the angle ⁇ is set to an angle such that when the CW 3 somewhat lifted up is moved down, the CW 3 is not substantially interfere with the support bed 2 a standing out from the upper rotating body 2 .
- the oscillating means is constituted by a hydraulic cylinder.
- the lower end thereof is arranged in the vicinity of a pivotal portion of the telescoping arm. If the rod of the hydraulic cylinder is connected to the outer tube of the telescoping arm, the telescoping arm can be oscillated with a hydraulic pump as a drive source provided on the construction machine without using a special drive mechanism.
- FIGS. 7 a and 7 b show the constitution of CW. Particularly, FIG. 7 a is a plan view thereof, and 7 b is a sectional view taken on C-C thereof.
- the CW 3 is formed in its central portion with a depressed groove 3 a in the shape of horseshoe as shown in FIG. 7 a .
- Suspension fittings 21 for connecting the other end of the chain 12 are respectively secured by way of welding to opposed side walls 3 b , 3 b opposed in the depressed groove 3 a .
- the rear side wall 3 c perpendicular to the side walls 3 b , 3 b is formed at the upper part with a thick portion 3 d as shown in FIG. 7 b .
- At the lower part is formed a thin portion 3 e in order to avoid interference with the hydraulic cylinder 17 for oscillation.
- numeral 22 denotes a fixing plate for fixing the telescoping arm 4 when the construction machine is transported.
- This fixing plate 22 is projected forward-downwardly from the front surface (on the machine side) of the connecting plate 15 .
- a stop plate 22 b capable of coming into contact with a receiving plate 5 a of the floor plate 5 is provided at one end 22 a of the fixing plate 22 .
- a slot such as a long hole is formed in the end 22 a of the fixing plate 22 .
- the receiving plate 5 a of the floor plate 5 is formed with a pair of brackets 23 corresponding to the end 22 a of the fixing plate 22 .
- a fixing pin 24 is inserted into through-holes of the pair of brackets 23 and the slot whereby the erected telescoping arm 4 can be secured.
- numeral 25 denotes a chain cover for preventing the chain 12 from dropping out of each of the sprockets 11 .
- a manual switching valve for operating a valve spool by a manual lever (an operating body) may be provided.
- the manual switching valve is provided at a portion where it is capable of confirming a hoisting movement of the CW 3 and is located on an external body of the construction machine. This allows an operator to carry out the attaching and detaching operation of the CW 3 single-handedly.
- the manual switching valve may be constituted by an electromagnetic valve, and the operation of the valve spool may be remote-controlled. This allows an operator to carry out the attaching and detaching operation of the CW 3 at a position away from the construction machine.
- the fixing pin 24 for connecting the fixing plate 22 and the brackets 23 is pulled out.
- Bolts for connecting a bottom portion of the CW 3 and the support bed 2 a is removed.
- the bolts comprise generally four bolts which are inserted from the bottom of the support bed 2 a and fastened and secured to the bottom portion of the CW 3 .
- the hydraulic cylinder 8 (see FIGS. 2 a , 2 b ) is extended by a fixed amount to draw the chain 12 out of the chain housing box 16 .
- the other end thereof is connected to the suspension fitting 21 of the CW 3 .
- the hydraulic cylinder 17 is contracted whereby the telescoping arm 4 is rotated in a direction of arrow D around the connecting pin 7 as fulcrum.
- the contracting operation is stopped.
- the CW 3 is located to position rearward and upward of the machine body, displaced from a position where the CW is mounted on the supported bed 2 a.
- the stretched hydraulic cylinder 8 is operated to be contracted whereby the other end of the chain 12 is rewound through the sprockets 11 . Thereby the CW 3 is moved down on the ground (ground level (GL) of FIG. 1).
- the fixing pin 24 is inserted into the fixing plate 22 and the brackets 23 . Thereby, the telescoping arm 4 is secured to assume a state capable of being transported.
- the hydraulic cylinder 8 is stretched out, and the other end of the chain 12 is drawn out of the chain housing box 16 .
- the hydraulic cylinder 17 is contracted to incline the telescoping arm 4 by ⁇ °.
- the hydraulic cylinder 8 is contracted and the other end of the chain 13 is moved down onto the suspension fitting 21 of the CW 3 .
- the other end of the chain 12 is connected to the suspension fitting 12 , and the hydraulic cylinder 8 is stretched out to thereby force up the CW 3 .
- the CW 3 is not interfere with the support bed 2 a at the time of lifting.
- the hydraulic cylinder 17 is stretched out to erect the telescoping arm 4 substantially vertically. Further, the hydraulic cylinder 8 is contracted to move down the CW 3 on the support bed 2 a.
- the CW 3 can be moved in a constant attitude or upright posture till it moves from the ground to the support bed 2 a . Because of this, the counterweight can be mounted extremely easily. Moreover, the CW 3 is moved up and down using the chain 12 , and movement in the width direction of the chain 12 is suppressed by engagement of the chain 12 with the sprockets 11 . Accordingly, it is possible to suppress swinging of the CW in the width direction of the machine. If the CW 3 is placed on the support bed 2 a without swinging as described above, positioning can be also carried out accurately, quickly and simply.
- the restiform body according to the present invention is able to suppress swinging in the width direction of the machine body, use of a chain is preferable.
- a wire rope can be also used depending on the weight of a counterweight.
- the oscillating means is constituted by a hydraulic cylinder in the aforesaid embodiment.
- the oscillating means is not limited thereto.
- a wire rope of a winch is connected to the outer tube 4 a of the telescoping arm 4 , and the telescoping arm 4 can be also oscillated by winding or rewinding the wire rope.
- At lease a pair of the telescoping arms are disposed in the width direction of the machine body.
- a counterweight can be lifted or suspended more stably.
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Abstract
Description
- 1. Field of the Invention
- The present invention relates to a device for attaching and detaching a counterweight of a construction machine.
- 2. Description of the Related Art
- A counterweight (hereinafter sometimes referred to as CW) of a construction machine is normally placed on a support bed projected horizontally from a rear end of a rotating frame of an upper rotating body. The CW is secured to the support bed by means of fixing bolts. The CW is removed when the construction machine is transported, and mounted when working. When the CW is attached or detached, the CW has to be lifted or suspended so as not to interfere with the support bed.
- For example, a method for attaching and detaching a counterweight disclosed in Japanese Patent Application Laid-Open No. Hei 7-324354 is known. As shown in FIG. 8a, first, a
construction machine 80 is gone up to aninclined bed 81 to incline an upper rotatingbody 88. Then, anupper portion 84 a of aboom 84 and an upper surface portion 85 a ofCW 85 are connected by awire rope 87 through asheave 86 a provided on an upper end of amast 86, and the fixing bolts are removed. As a result, the CW85 is hung down from thesheave 86 a by gravity, and theCW 85 is moved away from thesupport bed 89. - Next, as shown in FIG. 8b, when the
boom 84 is raised up, thewire rope 87 is delivered from thesheave 86 a whereby the CW 85 can be dropped off on the ground. - However, in the aforementioned method, a large inclined bed has to be prepared every time the
CW 85 is attached or detached. Moreover, there poses a problem that the construction machine is forced to assume the unstable attitude. - Further, since rewinding or hoisting of a wire rope is carried out by boom rasing or lowering operation, it is difficult to locate the
CW 85 to the support bed. Moreover, an operator who operates the boom is not able to grasp the suspending condition of theCW 85 from an operating seat. There is a problem that since operation has to be carried out through the aid of a person giving a sign, the work efficiency is poor. - It is an object of the present invention to provide a device for attaching and detaching a counterweight capable of attaching and detaching a counterweight easily and simply to attain the enhancement of the efficiency of attaching and detaching work, and a construction machine having the device.
- The construction machine having a device for attaching and detaching a counterweight according to the present invention has the following constitution.
- The present invention comprises a lower traveling body; an upper rotating body mounted rotatably on the lower traveling body, the upper rotating body having a support bed standing out from a rear portion thereof; an attaching and detaching device for attaching and detaching a counterweight mounted on the support bed. The attaching and detaching device comprises a telescoping device having a lower end pivotally connected in the vicinity of the support bed, a restiform body hung down through a guide portion provided on the telescoping device, and oscillating means for oscillating the telescoping device around the lower end as fulcrum. The oscillating means displaces the telescoping device extended from a substantially vertical attitude to an inclined attitude when the counterweight is removed or moved downward.
- In this case, when the telescoping device is expanded or contracted, the counterweight can be raised or fallen through the restiform body hung down from the guide portion. When the telescoping device is displaced from a substantially vertical attitude to an inclined attitude by the oscillating means, the counterweight can be moved to a position not to interfere with the support bed or the counterweigh can be moved upward of the support bed without interfering with the support bed. Because of this, the counterweight can be attached or detached from the support bed by its own exertions and quickly.
- Further, since a series of operation are carried out while lifting the counterweight (that is, while maintaining a fixed attitude), it is also easy to locate of the counterweight to the support bed.
- FIG. 1 is a front view showing the constitution of a device for attaching and detaching a counterweight according to one embodiment of the present invention;
- FIG. 2a is a front view showing, in an enlarged scale, the constitution of an expansion and contraction arm as telescoping devices according to the device of FIG. 1, and FIG. 2b is a right side view thereof;
- FIG. 3 is an enlarged view of a chain fixing portion shown in FIG. 1;
- FIG. 4 is a sectional view taken on A-A of FIG. 2b;
- FIG. 5 is a sectional view taken on B-B of FIG. 2b;
- FIG. 6 is a schematic view showing a mounting state of a
hydraulic cylinder 17 shown in FIG. 1; - FIG. 7a is a plan view showing the constitution of a
counterweight 3 shown in FIG. 1, and - FIG. 7b is a sectional view taken on C-C thereof; and
- FIGS. 8a and 8 b are respectively schematic views showing a conventional method for attaching and detaching a counterweight.
- The present invention will be described hereinafter on the basis of embodiments shown in the drawings. This is one embodiment of the present invention and is not limited thereto.
- FIG. 1 shows one embodiment of a device for attaching and detaching a counterweight according to the present invention. In the construction machine shown in the figure, an upper rotating
body 2 is mounted rotatably on a lower traveling body having a crawler 1 mounted thereon. Asupport bed 2 a for placing aCW 3 thereon is stood out in a horizontal direction from a rear end of the upper rotatingbody 2. - The CW3 placed on the
support bed 2 a is formed, in its central portion, with adepressed groove 3 a from a planar view thereof.Telescoping arms 4 as a pair of telescoping devices are stood upright within thedepressed groove 3 a (only atelescoping arm 4 near side is shown). - FIGS. 2a and 2 b show the constitution of the
telescoping arm 4 in an enlarged scale. Particularly, FIG. 2a is a front view thereof, and FIG. 2b is a right side view thereof. Thetelescoping arm 4 has anouter tube 4 a and aninner tube 4 b which slidably moves within theouter tube 4 a. The lower end of theouter tube 4 a is connected through a connectingpin 7 to abearing 6 stood upright in parallel from afloor plate 5. - On the other hand, a
box 4 c is secured to the upper end within theinner tube 4 b. Arotational shaft 9 is inserted so as to extend through thebox 4 c in a horizontal direction.Sprockets 11 as a guide unit are rotatably mounted on opposite ends of therotational shaft 9 through a bearingunit 10. Ahydraulic cylinder 8 is inserted into theinner tube 4 b. A tubelower end 8 a of thehydraulic cylinder 8 is connected to the connectingpin 7. Anend 8 b of a rod is connected to therotational shaft 9. Accordingly, when a pair ofhydraulic cylinders 8 provided internally of thetelescoping arms 4 are expanded and contracted in cooperation each other, therotational shaft 9 held on both theboxes 4 c moves up and down. Thereby, thesprockets 11 can be moved up and down. - A reinforcing
ring 4 d is wound around the upper end of theouter tube 4 a. One end of thechain 12 as a restiform body is secured to the reinforcingring 4 d. In detail, a mountingfitting 13 is secured to the side wall of the reinforcingring 4 d. One end of thechain 12 is secured to acoupling 14 provided on the mountingfitting 13. - The
chain 12 is hung down turning down thesprockets 11, and the other end thereof is connected to the upper part of theCW 3. It is noted that the overall length of thechain 12 is set to a length enough to move down theCW 3 removed from thesupport bed 2 a on the ground. - In the present embodiment, the restiform body is constituted by a chain, the guide unit is engaged with the chain, and is constituted by a rotatable sprocket. Therefore, it is possible to suppress vibrations in the width direction of a body of the machine when a counterweight is attached or detached.
- Further, as shown in an enlarged view of FIG. 3, the mounting
fitting 13 is connected to one end of thechain 12 while being displaced somewhat rearward. Thereby, the amount of engagement of thechain 12 with respect to thesprockets 11 is increased. As a result, even if thetelescoping arm 4 is contracted in the state that theCW 3 is removed and thechain 12 loses tension, the amount of engagement is kept increased. Accordingly, thechain 12 is hard to be disengaged from thesprockets 11. - FIG. 4 is a cross-section view taken on A-A of FIG. 2b. An
inner tube 4 b having a square in section is housed in anouter tube 4 a having a rectangular shape in section. Theinner tube 4 b is supported by a pair ofsliders 15 a secured to theouter tube 4 a by abolt 15. Theinner tube 4 b slides smoothly with thesliders 15 a as a guide unit. - FIG. 5 is a cross-section view taken on B-B of FIG. 2b. Side walls on the machine side of both the
outer tubes 4 a are connected by a connectingplate 15. A pair ofbrackets 15 b projected in parallel from the connectingplate 15 are arranged between both theouter tubes 4 a.Numeral 16 denotes a housing box mounted on the lateral side wall of theouter tube 4 a to house thechain 12 removed from theCW 3. - To the
brackets 15 b is connected anend 17 a on the rod side of ahydraulic cylinder 17 as oscillating means shown in FIG. 6 through afirst pin 18. A tubelower end 17 b of thehydraulic cylinder 17 is connected to abearing 19 provided on afloor plate 5 through asecond pin 20. Accordingly, when thehydraulic cylinder 17 is contracted, thetelescoping arm 4 can be displaced from a substantially vertical position (a position indicated by the solid line of FIG. 1) to an inclined position inclined by θ° (a position indicated by the chain double-dashed lines in FIG. 1). - The angle θ is set to an angle such that when the
CW 3 somewhat lifted up is moved down, theCW 3 is not substantially interfere with thesupport bed 2 a standing out from the upperrotating body 2. - In the present embodiment, the oscillating means is constituted by a hydraulic cylinder. The lower end thereof is arranged in the vicinity of a pivotal portion of the telescoping arm. If the rod of the hydraulic cylinder is connected to the outer tube of the telescoping arm, the telescoping arm can be oscillated with a hydraulic pump as a drive source provided on the construction machine without using a special drive mechanism.
- Further, FIGS. 7a and 7 b show the constitution of CW. Particularly, FIG. 7a is a plan view thereof, and 7 b is a sectional view taken on C-C thereof.
- The
CW 3 is formed in its central portion with adepressed groove 3 a in the shape of horseshoe as shown in FIG. 7a.Suspension fittings 21 for connecting the other end of thechain 12 are respectively secured by way of welding to opposedside walls depressed groove 3 a. Therear side wall 3 c perpendicular to theside walls thick portion 3 d as shown in FIG. 7b. At the lower part is formed athin portion 3 e in order to avoid interference with thehydraulic cylinder 17 for oscillation. - Further, in FIG. 2a, numeral 22 denotes a fixing plate for fixing the
telescoping arm 4 when the construction machine is transported. This fixingplate 22 is projected forward-downwardly from the front surface (on the machine side) of the connectingplate 15. Astop plate 22 b capable of coming into contact with a receivingplate 5 a of thefloor plate 5 is provided at oneend 22 a of the fixingplate 22. When the receivingplate 5 a and thestop plate 22 b come in contact with each other, thetelescoping arm 4 is stood upright substantially vertically. - A slot such as a long hole is formed in the
end 22 a of the fixingplate 22. On the other hand, the receivingplate 5 a of thefloor plate 5 is formed with a pair ofbrackets 23 corresponding to theend 22 a of the fixingplate 22. A fixingpin 24 is inserted into through-holes of the pair ofbrackets 23 and the slot whereby the erectedtelescoping arm 4 can be secured. - In the figure, numeral25 denotes a chain cover for preventing the
chain 12 from dropping out of each of thesprockets 11. - For the purpose of switching the direction of pressure oil with respect to the
hydraulic cylinder 8 and thehydraulic cylinder 17, a manual switching valve for operating a valve spool by a manual lever (an operating body) may be provided. Preferably, the manual switching valve is provided at a portion where it is capable of confirming a hoisting movement of theCW 3 and is located on an external body of the construction machine. This allows an operator to carry out the attaching and detaching operation of theCW 3 single-handedly. - Further, the manual switching valve may be constituted by an electromagnetic valve, and the operation of the valve spool may be remote-controlled. This allows an operator to carry out the attaching and detaching operation of the
CW 3 at a position away from the construction machine. - Now, the attaching and detaching operation by way of the device for attaching and detaching a counterweight having the above-described constitution will be explained.
- In FIG. 1, when the
counterweight 3 is not attached or detached, thetelescoping arm 4 is in the contracted state. In this case, the maximum height is shown by H low. - A description will be made hereinafter of a case where the
CW 3 is removed from thesupport bed 2 a. - First, the fixing
pin 24 for connecting the fixingplate 22 and thebrackets 23 is pulled out. Bolts for connecting a bottom portion of theCW 3 and thesupport bed 2 a is removed. The bolts comprise generally four bolts which are inserted from the bottom of thesupport bed 2 a and fastened and secured to the bottom portion of theCW 3. - Next, the hydraulic cylinder8 (see FIGS. 2a, 2 b) is extended by a fixed amount to draw the
chain 12 out of thechain housing box 16. The other end thereof is connected to the suspension fitting 21 of theCW 3. - Next, the
hydraulic cylinder 8 is stretched to the maximum stroke T. Thechain 12 on the side connected to theCW 3 is raised through thesprockets 11. Thereby, theCW 3 is levitated or come up somewhat from thesupport bed 2 a. - Next, the
hydraulic cylinder 17 is contracted whereby thetelescoping arm 4 is rotated in a direction of arrow D around the connectingpin 7 as fulcrum. When the telescoping arm is inclined by θ°, the contracting operation is stopped. At this time, theCW 3 is located to position rearward and upward of the machine body, displaced from a position where the CW is mounted on the supportedbed 2 a. - Next, the stretched
hydraulic cylinder 8 is operated to be contracted whereby the other end of thechain 12 is rewound through thesprockets 11. Thereby theCW 3 is moved down on the ground (ground level (GL) of FIG. 1). - It is noted that there is room S for a suspension allowance of
CW 3 so that the attaching and detaching of thechain 12 can be carried out easily with respect to the suspension fitting 21. - Next, the other end of the
chain 12 is removed from the suspension fitting 21, and the procedure reversed to that mentioned above is carried out. That is, thehydraulic cylinder 17 is stretched out, thetelescoping arm 4 is returned to a substantially vertical attitude, and thehydraulic cylinder 8 is contracted. Thereby, thetelescoping arm 4 is returned to an initial position. However, the other end of thechain 12 is to be housed into thechain housing box 16. - Next, the fixing
pin 24 is inserted into the fixingplate 22 and thebrackets 23. Thereby, thetelescoping arm 4 is secured to assume a state capable of being transported. - Further, in a case where the
CW 3 is mounted on thesupport bed 2 a, the following procedure is taken. First, thehydraulic cylinder 8 is stretched out, and the other end of thechain 12 is drawn out of thechain housing box 16. Thehydraulic cylinder 17 is contracted to incline thetelescoping arm 4 by θ°. Thehydraulic cylinder 8 is contracted and the other end of thechain 13 is moved down onto the suspension fitting 21 of theCW 3. - Next, the other end of the
chain 12 is connected to the suspension fitting 12, and thehydraulic cylinder 8 is stretched out to thereby force up theCW 3. At this time, since thetelescoping arm 4 is in the inclined attitude, theCW 3 is not interfere with thesupport bed 2 a at the time of lifting. Next, thehydraulic cylinder 17 is stretched out to erect thetelescoping arm 4 substantially vertically. Further, thehydraulic cylinder 8 is contracted to move down theCW 3 on thesupport bed 2 a. - As described above, the
CW 3 can be moved in a constant attitude or upright posture till it moves from the ground to thesupport bed 2 a. Because of this, the counterweight can be mounted extremely easily. Moreover, theCW 3 is moved up and down using thechain 12, and movement in the width direction of thechain 12 is suppressed by engagement of thechain 12 with thesprockets 11. Accordingly, it is possible to suppress swinging of the CW in the width direction of the machine. If theCW 3 is placed on thesupport bed 2 a without swinging as described above, positioning can be also carried out accurately, quickly and simply. - Next, when the bolts are inserted from the bottom of the
support bed 2 a, and fastened and secured to the bottom of theCW 3, a mounting of theCW 3 is completed. - Since the restiform body according to the present invention is able to suppress swinging in the width direction of the machine body, use of a chain is preferable. Of course, a wire rope can be also used depending on the weight of a counterweight.
- Further, the oscillating means is constituted by a hydraulic cylinder in the aforesaid embodiment. Of course, the oscillating means is not limited thereto. For example, a wire rope of a winch is connected to the
outer tube 4 a of thetelescoping arm 4, and thetelescoping arm 4 can be also oscillated by winding or rewinding the wire rope. - Preferably, at lease a pair of the telescoping arms are disposed in the width direction of the machine body. In this case, a counterweight can be lifted or suspended more stably.
- While one embodiment of the present invention has been disclosed as described above, it is noted that the scope of protection of the present invention is not limited thereto. Equivalents which exhibit the operation and effect of the present invention are included in the scope of the present invention.
Claims (9)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000364606A JP2002167807A (en) | 2000-11-30 | 2000-11-30 | Counter-weight disconnecting device |
JP2000-364606 | 2000-11-30 |
Publications (2)
Publication Number | Publication Date |
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US20020062586A1 true US20020062586A1 (en) | 2002-05-30 |
US6434866B1 US6434866B1 (en) | 2002-08-20 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US09/991,645 Expired - Fee Related US6434866B1 (en) | 2000-11-30 | 2001-11-26 | Device for attaching and detaching a counterweight of construction machine |
Country Status (2)
Country | Link |
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US (1) | US6434866B1 (en) |
JP (1) | JP2002167807A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10066365B2 (en) | 2016-01-22 | 2018-09-04 | Hpm—Hydraulic Performance Machines Srl | Public works vehicle provided with counterweight lifting system |
US11313101B2 (en) * | 2017-09-29 | 2022-04-26 | Hitachi Construction Machinery Tierra Co., Ltd. | Construction machine |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6871427B2 (en) | 2001-11-05 | 2005-03-29 | Kobelco Construction Machinery Co., Ltd. | Construction machine and self-attaching and-detaching method thereof |
DE102010013390B3 (en) * | 2010-03-30 | 2011-10-06 | Zeppelin Baumaschinen Gmbh | Device for applying and settling counter weight of set of construction machine, particularly chain dredger, has pulley which has lifting roll connected with counter weight, rotatable draw roll supported at frame and rotatable guide roll |
KR102162363B1 (en) | 2020-03-02 | 2020-10-06 | 현대건설기계 주식회사 | Counterweiht mounting device and working machine having the same |
JP7345536B2 (en) | 2021-12-03 | 2023-09-15 | 株式会社小松製作所 | working machine |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0318089A (en) | 1989-06-15 | 1991-01-25 | Tdk Corp | Resistor paste, thick film resistor layer, wiring board, and manufacture of wiring board |
JPH07324354A (en) | 1994-05-31 | 1995-12-12 | Yutani Heavy Ind Ltd | Method for attaching and detaching counter weight |
JPH08302746A (en) | 1995-05-11 | 1996-11-19 | Hitachi Constr Mach Co Ltd | Counterweight device for working machine |
JPH08319637A (en) | 1995-05-25 | 1996-12-03 | Komatsu Ltd | Attaching-detaching device for counterweight |
JPH0978629A (en) | 1995-07-12 | 1997-03-25 | Komatsu Ltd | Attaching and detaching device for counterweight |
JPH10219746A (en) | 1997-01-31 | 1998-08-18 | Yutani Heavy Ind Ltd | Device for mounting/demounting counterweight for hydaulic backhoe |
JPH111940A (en) | 1997-06-12 | 1999-01-06 | Shin Caterpillar Mitsubishi Ltd | Work machine with attaching/detaching device for counterweight |
-
2000
- 2000-11-30 JP JP2000364606A patent/JP2002167807A/en active Pending
-
2001
- 2001-11-26 US US09/991,645 patent/US6434866B1/en not_active Expired - Fee Related
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10066365B2 (en) | 2016-01-22 | 2018-09-04 | Hpm—Hydraulic Performance Machines Srl | Public works vehicle provided with counterweight lifting system |
US11313101B2 (en) * | 2017-09-29 | 2022-04-26 | Hitachi Construction Machinery Tierra Co., Ltd. | Construction machine |
Also Published As
Publication number | Publication date |
---|---|
US6434866B1 (en) | 2002-08-20 |
JP2002167807A (en) | 2002-06-11 |
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