JP2013108247A - Apparatus for connecting/disconnecting upper and lower connecting pins of work machine and method for assembling/disassembling the work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for connecting/disconnecting upper and lower connecting pins of a work machine and a method for assembling/disassembling the work machine in which a lower traveling body and an upper revolving body can be disassembled and coupled easily with reduced labor and it can be implemented even in a relatively small work machine.SOLUTION: A hydraulic cylinder unit 33 is mounted to a boom cylinder mounting part 9 provided in a revolving frame 3. A connecting part 27c in a piston rod distal end of the hydraulic cylinder 27 is connected to a hydraulic cylinder connector 24 provided in an outer end of a connecting pin 18 with a pin 25. By shrinking or extending the hydraulic cylinder 27, the connecting pin 18 is pulled out of or inserted into pin holes of a lower ring 16 and an upper ring 17. A revolving device 25 of a work machine is driven to revolve an upper revolving body and another connecting pin 18 is pulled out or inserted.

Description

  In the present invention, a turning frame is installed on a lower traveling body via a turning device, such as a dismantling machine, a hydraulic excavator, or a crane, and a power unit, a driver's cab, etc. are mounted on the turning frame and the upper turning body is installed. The present invention relates to an apparatus for attaching and detaching a pin for detachably connecting a lower traveling body and an upper revolving body, and an assembling method and a disassembling method of the working machine in a working machine configured by attaching a work front to a revolving frame. .

  In a work machine that is a demolition machine, a hydraulic excavator, a crane, or an application machine thereof, it is necessary to transport the road by a trailer truck or the like every time the work site changes. However, in transportation on the road, the maximum transportable weight, full width, total length, and total height are restricted by the road traffic law. For this reason, in a comparatively large working machine, it becomes necessary to disassemble and transport the lower traveling body and the upper swing body.

  For this vertical disassembly transportation and assembly, conventionally, a structure in which a lower ring provided on the center frame of the lower traveling body and an upper ring provided on the swivel device are detachably coupled using bolts has been used. I came. Further, as another conventional vertical dividing device, as described in Patent Document 1, a plurality of pin holes are provided radially at corresponding portions of the lower ring and the upper ring, and a connecting pin is manually inserted into the pin hole or Some of them can be combined and separated by pulling out. Further, some conventional cranes are provided with a hydraulic cylinder for each connecting pin for inserting / removing a connecting pin to be inserted into a corresponding pin hole of the lower ring and the upper ring.

JP 59-4596 A

  However, according to the conventional structure in which the lower traveling body and the upper revolving body are releasably coupled with bolts, in a work machine with many on-site movements such as a dismantling machine, it takes time and manpower to fasten and remove the bolts. There was a problem that the wear of the bolt crest progressed by repeatedly attaching and detaching.

  In addition, in the case where the pins for connecting the lower traveling body and the upper swing body are manually inserted and removed, there is a problem that the force for inserting and removing the connection pins is insufficient, and this insertion and removal may be difficult.

  In addition, in the case of a device having a hydraulic cylinder that inserts and removes each connecting pin, this structure can be realized if the working machine has a large outer shape of the swivel ring. There is a problem that this structure cannot be realized because the accommodation space is narrow.

  In view of the above-described problems, the present invention makes it possible to easily disassemble and connect the lower traveling body and the upper swing body with less effort and can be realized even with a relatively small working machine. It is an object of the present invention to provide an apparatus for attaching and detaching upper and lower connecting pins of a machine, and an assembling method and a disassembling method of a working machine.

The attachment / detachment device for the upper and lower connecting pins of the work machine according to claim 1 is:
A swivel type in which a swivel frame is installed on a lower traveling body via a swivel device, a power unit and a driver's cab are mounted on the swivel frame to form an upper swivel body, and a work front is detachably attached to the swivel frame Used in working machines,
One of the lower ring provided on the center frame of the lower traveling body and the upper ring provided on the inner ring of the turning device is provided with a longitudinal groove in the circumferential direction, and the other ring is fitted into the longitudinal groove. In addition, the upper and lower connection of the working machine for connecting the lower traveling body and the upper swinging body in a dismountable manner by inserting connection pins into a plurality of pin holes provided radially at the corresponding positions of the lower ring and the upper ring, respectively. In the pin attachment / detachment device,
A hydraulic cylinder unit for inserting / removing the connecting pin, which is detachably attached to a boom cylinder attaching portion provided in the revolving frame;
The hydraulic cylinder constituting the hydraulic cylinder unit is attached to the outside of the turning device with the piston rod facing the turning center side of the turning device, and at the outer end of the connecting pin and the inner end of the piston rod, It is characterized by comprising a connecting portion that is detachably connected to each other by a pin.

The method of assembling the work machine according to claim 2 comprises:
A swivel type in which a swivel frame is installed on a lower traveling body via a swivel device, a power unit and a driver's cab are mounted on the swivel frame to form an upper swivel body, and a work front is detachably attached to the swivel frame Used in working machines,
One of the lower ring provided on the center frame of the lower traveling body and the upper ring provided on the inner ring of the turning device is provided with a longitudinal groove in the circumferential direction, and the other ring is fitted into the longitudinal groove. And a method of assembling the working machine for connecting the lower traveling body and the upper swinging body in a dismountable manner by inserting connection pins into a plurality of pin holes radially provided at corresponding positions of the lower ring and the upper ring, respectively. In
A hydraulic cylinder unit for inserting / removing the connecting pin is positioned outside the swivel device at a boom cylinder mounting portion provided in the swivel frame, and a piston rod of the hydraulic cylinder is directed toward the swivel center of the swivel device. Installation,
A first step of pin-connecting a connecting portion at a tip of a piston rod of the hydraulic cylinder to a hydraulic cylinder connecting portion provided at an outer end of the connecting pin;
A second step of inserting the connecting pin into the pin hole of the lower ring and the upper ring by extension of the hydraulic cylinder;
A third step of releasing the pin connection between the hydraulic cylinder connecting portion provided at the outer end of the connecting pin and the connecting portion at the tip of the piston rod of the hydraulic cylinder;
A fourth step of changing the position of the pin hole to be connected to the connecting pin by driving the turning device by a hydraulic power source provided in the hydraulic power unit to turn the upper turning body.
By repeating the first to fourth steps, the lower traveling body and the upper turning body are assembled with pins.

The method for disassembling the work machine according to claim 3 is:
A swivel type in which a swivel frame is installed on a lower traveling body via a swivel device, a power unit and a driver's cab are mounted on the swivel frame to form an upper swivel body, and a work front is detachably attached to the swivel frame Used in working machines,
One of the lower ring provided on the center frame of the lower traveling body and the upper ring provided on the inner ring of the turning device is provided with a longitudinal groove in the circumferential direction, and the other ring is fitted into the longitudinal groove. And a disassembling method of the working machine for connecting the lower traveling body and the upper swinging body in a dismountable manner by inserting connecting pins into a plurality of pin holes provided radially at the corresponding positions of the lower ring and the upper ring, respectively. In
A hydraulic cylinder unit for inserting / removing the connecting pin is positioned outside the swivel device at a boom cylinder mounting portion provided in the swivel frame, and a piston rod of the hydraulic cylinder is directed toward the swivel center of the swivel device. Installation,
A first step of pin-connecting a connecting portion at a tip of a piston rod of the hydraulic cylinder to a hydraulic cylinder connecting portion provided at an outer end of a connecting pin inserted into a pin hole of the lower ring and the upper ring;
A second step of pulling out the connecting pin from the pin hole of the lower ring and the upper ring by contraction of the hydraulic cylinder;
A third step of releasing the pin connection between the hydraulic cylinder connecting portion provided at the outer end of the connecting pin and the connecting portion at the tip of the piston rod of the hydraulic cylinder;
A fourth step of changing the position of the connecting pin to be pulled out by driving the turning device by a hydraulic power source provided in the hydraulic power unit to turn the upper turning body.
By repeating the first to fourth steps, the connection between the lower traveling body and the upper swing body by the pin is released.

  According to the present invention, since the connecting pin for connecting the lower traveling body and the upper swinging body so as to be disassembled is performed using the hydraulic cylinder, there is no problem of insufficient force as in the case of manual operation. In addition, it is possible to easily attach and detach the connecting pin without requiring much labor and labor as in the conventional case where the lower traveling body and the upper swinging body are detachably coupled with bolts. It becomes. In addition, according to the present invention, since one hydraulic cylinder may be provided as a hydraulic cylinder for attaching and detaching the pin, a large working space for accommodating the hydraulic cylinder is not required, and the working machine is relatively small. Can also be realized.

It is a side view which decomposes | disassembles and shows the structure of the working machine main body to which the attachment / detachment apparatus of the vertical connection pin of this invention is applied. It is a side view which shows one Embodiment of the attachment / detachment apparatus of the vertical connection pin by this invention. It is a top view which shows an example of the turning frame which applies the attachment / detachment apparatus of the vertical connection pin by this invention. It is side surface sectional drawing shown in the state which attached the attachment or detachment apparatus of the vertical connection pin of this Embodiment to the turning frame. It is a top view which shows the attachment or detachment apparatus of the upper and lower connection pin of this Embodiment in the state attached to the turning frame. It is side surface sectional drawing which shows an example of the retaining structure of the connection pin in this Embodiment. It is a front view which shows the state which attached the hydraulic cylinder unit used as the attachment / detachment apparatus of the upper / lower connecting pin of this Embodiment to the turning frame. It is a disassembled top view which shows the hydraulic cylinder unit of this Embodiment. It is a side view which shows the hydraulic cylinder unit of this Embodiment. It is process drawing which shows the attachment process to the boom cylinder attachment part of the hydraulic cylinder unit of this Embodiment. It is process drawing which shows the decomposition | disassembly process of the lower traveling body and upper revolving body of this Embodiment. It is process drawing which shows the coupling | bonding process of the lower traveling body and upper revolving body of this Embodiment.

  FIG. 1 is an exploded side view showing a structure of a working machine main body to which an upper / lower connecting pin attaching / detaching device of the present invention is applied, and FIG. 2 is a side view showing a state in which a part thereof is omitted and assembled. 1 and 2, reference numeral 1 denotes a lower traveling body. The lower traveling body 1 has left and right side frames 1b attached to both sides of a center frame 1a, and a hydraulic motor (not shown) at the rear end of each side frame 1b. ), The driven wheels 1d are attached to the front ends of the side frames 1b, and the crawler belts 1e are wound around the driving wheels 1c and the driven wheels 1d.

  A turning frame 3 is installed on the center frame 1a of the lower traveling body 1 via a turning device 2, and a hydraulic power unit 4, an operator cab 5, a counterweight (not shown), etc. are mounted on the turning frame 3. The revolving body 6 is configured. As shown in the side view of FIG. 2 and the plan view of FIG. 3, the front portion of the revolving frame 3 has a work front (not shown) mounting portion 7 constituted by vertical plates 3 a and 3 a. The front mounting portion 7 includes a boom mounting portion 8 and a boom cylinder mounting portion 9 for raising and lowering the boom.

  The boom mounting portion 8 has pin holes 8a and 8a provided in the vertical plates 3a and 3a, respectively, and a boom (not shown) is attached by pins (not shown) inserted into the pin holes 8a and 8a. Is. The boom cylinder mounting portion 9 includes front end portions of the vertical plates 3a and 3a and vertical plates 9a and 9a provided facing the inner sides of the vertical plates 3a and 3a, respectively. The boom cylinder mounting portion 9 includes a connecting portion (boss) at one end of a boom cylinder (not shown) between the vertical plates 3a and 3a and the vertical plates 9a and 9a facing the vertical plates 3a and 3a, respectively. The pin holes 9b, 9b provided in the vertical plates 3a, 3a, the pin holes 9c, 9c provided in the vertical plates 9a, 9a, and the pins (not shown) to be inserted into the connecting portions (bosses) of the boom cylinder Thus, one end of the boom cylinder is connected.

  There are various types of work fronts to be attached to the front attachment portion 7 according to the work purpose. In the case of a dismantling machine, a hook-like cutter or crushing tool is attached to the tip of an arm that is rotatably attached to the boom. Is installed as a work tool. In the case of an excavator, a bucket, an auger, or the like is attached to the tip of a boom of an articulated structure or a telescopic type. A work front used as a crane may be attached.

  As shown in the side sectional view of FIG. 4, the turning device 2 includes an outer ring 12 fixed to the turning frame 3 with bolts 11, and an inner ring 14 combined with the outer ring 12 through a bearing 13 so as to be turnable. . The inner ring 14 has an internal gear 14 a that meshes with an output gear (none of which is shown) of a turning motor installed on the turning frame 3. Reference numeral 15 denotes a circular frame installed on the center frame 1 a of the lower traveling body 1 for attaching the turning device 2.

  Reference numeral 16 denotes a lower ring attached to the circular frame 15. The lower ring 16 is provided with a vertical groove 16a having an upper opening over the entire circumference. The lower ring 16 is formed by inserting a bolt 20 into a bolt insertion hole 16b provided through the bottom of the vertical groove 16a, and screwing and fastening the bolt 20 into a screw hole 15a provided in the circular frame 15. , Fixedly mounted on the frame 15. The upper ring 17 is fixedly attached to the lower part of the inner ring 14 by screwing and fastening a bolt 22 inserted from above into a bolt insertion hole 14b provided in the inner ring 14 into a screw hole 17a provided in the upper ring 17. .

  The upper ring 17 is detachably fitted in the longitudinal groove 16a of the lower ring 16. As shown in the plan view of FIG. 5, pin holes 16c provided radially on the lower ring 16 and connecting pins 18 are provided from the outside to pin holes 17b provided radially on the upper ring 17 corresponding to the pin holes 16c. By inserting and attaching, the upper turning body 6 including the turning device 2 is detachably attached to the lower traveling body 1.

  Reference numeral 24 denotes a connecting tool for connecting a hydraulic cylinder 27 for inserting and removing, which will be described later, to the connecting pin 18. As shown in FIGS. 4 and 6, the connector 24 has a bifurcated connecting portion 24a for connecting a boss 27c, which is a connecting portion at the tip of the piston rod 27b, with a pin 25 on one end side. The part 24a has a pin hole 24b into which the pin 25 is detachably inserted. A male screw part 24c is provided on the opposite side of the connecting part 24a of the connecting tool 24, and the male screw part 24c is screwed into a screw hole 18a provided in the connecting pin 18, whereby the connecting tool 24 is attached to the connecting pin 18.

  As shown in FIG. 6, rings 28 and 29 for inserting the retaining pins 26 of the connecting pins 18 are provided at positions on the outer peripheral surface of the lower ring 16 above and below the connecting pins 18. Each ring 28, 29 is provided with pin holes 28 a, 29 a for inserting the retaining pins 26 corresponding to the respective connecting pins 18. A cylindrical body 31 is fixed to the lower surface of the lower ring 29, and a hole 31a is provided in the cylindrical body 31 in the radial direction. The retaining pin 26 is attached by being inserted into the cylindrical body 31, the pin holes 28 a and 29 a of the rings 28 and 29, and the pin holes 24 b and 24 b of the connector 24. Then, by inserting the beta pin 30 into the pin hole 26 a provided in the retaining pin 26 and the pin hole 31 a provided in the cylindrical body 31, the connecting pin 18 is connected to the pin hole 16 c of the lower ring 16 and the pin hole of the upper ring 17. It can be fixed so that it cannot be pulled out in a state of being attached to 17b.

  4 and 5, reference numeral 33 denotes a hydraulic cylinder unit that is attached to the boom cylinder attachment portion 9 in order to insert and remove the connecting pin 18. FIG. 7 is a front view showing a state in which the hydraulic cylinder unit 33 is attached to the boom cylinder attaching portion 9, FIG. 8 is an exploded plan view showing the hydraulic cylinder unit 33, and FIG. 9 is a side view of the hydraulic cylinder unit 33.

  As shown in FIGS. 8 and 9, the hydraulic cylinder unit 33 includes a hydraulic cylinder 27 for inserting and removing the connecting pin 18, a bracket 34 for mounting the hydraulic cylinder 27 to the boom cylinder mounting portion 9, and the bracket 34 as a boom cylinder. And a pipe 35 for attachment to the attachment portion 9. The bracket 34 has a box shape that is long in the front-rear direction and the upper-lower direction in which the side view is substantially triangular. The bracket 34 includes a hole 34a into which the pipe 35 is inserted at the upper portion on the rear side thereof, and has a cylindrical portion 34b fixed to one surface of the bracket 34 so as to surround the hole 34a. On the other hand, a hole 34c for inserting a bolt 40 for fixing the hydraulic cylinder unit 33 is provided. Reference numeral 34e denotes a wire connecting portion for lifting the hydraulic cylinder unit 33 by a crane.

  A connecting portion 34d of the hydraulic cylinder 27 is fixed to the lower surface of the front portion of the bracket 34, and a bottom side end portion of the hydraulic cylinder 27 is connected to the connecting portion 34d by a pin 37. Further, the hydraulic cylinder 27 is attached to the bracket 34 by supporting the tube 27 a of the hydraulic cylinder 27 by the support fitting 38 attached to the lower surface of the bracket 34. When the hydraulic cylinder unit 33 is attached to the revolving frame 3, the hydraulic cylinder unit 33 is located outside the revolving device 2, and the piston rod 27b faces the revolving center.

  As shown in FIG. 7, the pipe 35 is inserted into the pin holes 9c, 9c provided in the vertical plates 9a, 9a constituting the boom cylinder mounting portion 9, and is removed at both ends as shown in FIG. It has holes 35a and 35a for inserting bolts 39 (39) for fixing, and holes 35b for inserting bolts (or pins) 40 for fixing the hydraulic cylinder unit near the center. Reference numeral 41 denotes a ring for fixing the pipe 35 that is detachably fitted to both ends of the pipe 35, and each has a hole 41a into which a bolt 39 is inserted. Reference numerals 42 and 43 denote nuts that are screwed into the bolts 39 and 40, respectively.

  FIG. 10 is a diagram showing a process of attaching the hydraulic cylinder unit 33 to the boom cylinder attaching part 9. First, as shown in FIG. 10 (A), the wire 44 suspended from the crane is hung on the connecting portion 34e of the bracket 34 to suspend the hydraulic cylinder unit 33, and the hydraulic cylinder unit 33 is moved to the vertical plates 9a and 9a on the revolving frame 3. Put the pipe 35 in between the pin hole 9b of one vertical plate 3a, and pass through the pin hole 9c of one vertical plate 9a, the hole 34a of the bracket 34, the cylindrical body 34b, and the pin hole of the other vertical plate 9a Pass 9c.

  When the pipe 35 is inserted into the holes 9c, 9c of the two vertical plates 9a, 9a, both ends of the pipe 35 protrude from the vertical plates 9a, 9a to the outside, and FIG. As shown in B), both ends of the pipe 35 protrude from the vertical plates 9a and 9a. Then, as shown in FIG. 10 (C), the fixing ring 41 is fitted to both ends of the pipe 35, and the retaining bolt 39 is inserted into the hole 41 a of the ring 41 and the hole 35 a of the pipe 35. The pipe 42 is fixed between the vertical plates 9a and 9a by screwing the nuts 42 into them.

  Further, a bolt 40 is inserted by aligning the position of the hole 34c of the cylindrical body 34b provided in the bracket 34 with the position of the hole 35b of the pipe 35, and a nut 43 is screwed into the bolt 40 to connect the hydraulic cylinder unit 33 to the pipe. Fix to 35. In this way, the hydraulic cylinder unit 33 can be attached to the boom cylinder attachment portion 9, and the hydraulic cylinder unit 33 can be detached from the boom cylinder attachment portion 9 in a process opposite to this attachment process.

  In this embodiment, an example in which the pipe 35 is inserted and attached to the vertical plates 9a and 9a has been shown. However, by changing this structure, both ends of the pipe 35 protrude outside the vertical plates 3a and 3a. Alternatively, a structure may be employed in which the retaining ring 41 is fitted to each of the protrusions, and the retaining bolt 39 is inserted into the ring 41. Further, one end of the pipe 35 protrudes to the outside of one vertical plate 3a, and the other end protrudes from the outside of the one vertical plate 9a on the opposite side of the two vertical plates 9a. A structure may be employed in which the retaining ring 41 is fitted and the retaining bolt 39 is inserted into each ring 41 and the hole 35a.

  FIG. 11 is a process diagram showing a process of separating the upper swing body 6 from the lower traveling body 1 using such a hydraulic cylinder unit 33. When the work implement is disassembled and transported, the work front including the work front boom and boom cylinder is removed from the revolving frame 3. Then, as explained in FIG. 10, the hydraulic cylinder unit 33 with the hydraulic cylinder 27 contracted is attached to the boom cylinder attachment portion 9, and the hydraulic oil supply joint (not shown) of the hydraulic cylinder 27 is connected to the upper swing body. 6 is connected to a hydraulic source of the hydraulic power unit 4 via a hydraulic hose (not shown).

  In this way, before or after attaching the hydraulic cylinder unit 33 to the boom cylinder mounting portion 9, at least the beta pin 30 of the retaining pin 26 that retains the connecting pin 18 corresponding to the hydraulic cylinder 27 is removed, and the retaining pin 26 is removed. Unplug. Then, by operating the swivel device 2 as necessary, the position of the hydraulic cylinder 27 is adjusted to the position of the connecting pin 18, the hydraulic cylinder 27 is extended, the boss 27 c is aligned with the connecting tool 24, and these are connected by the pin 25. To do.

  11A, by retracting the hydraulic cylinder 27, the connecting pin 18 is pulled out from the pin hole 17b of the upper ring 17, and a part of the connecting pin 18 is inserted into the pin hole 16c outside the lower ring 16. Then, as shown in FIG. 11B, the connection between the hydraulic cylinder 27 and the connector 24 by the pin 25 is released.

  Next, the swivel device 2 is operated so that the hydraulic cylinder 27 faces the different connecting pin 18. In this case, the turning pitch by the turning device 2 is set to one pitch of the connecting pin 18 or to two or more pitches. Alternatively, after a certain connecting pin 18 is removed from the pin hole 17 b of the upper ring 17, the connecting pin 18 on the substantially opposite side of the removed connecting pin 18 may be removed. After the pulling operation of the connecting pin 18 is performed for all the connecting pins, the upper ring 17 is lifted by the crane (not shown) to lift the upper ring 17 as shown in FIG. 11C. The upper revolving unit 6 is separated from the lower traveling unit 1 by being pulled out from 16.

  Thereafter, as shown in FIG. 11D, all the connecting pins 18 are pushed in, and the inner ends thereof penetrate through the pin holes 16 c inside the lower ring 16. The pushing operation of the connecting pin 18 can be performed relatively easily by human power without the upper ring 17. After all the connecting pins 18 are pushed in, the retaining pins 26 are inserted into the upper and lower rings 28 and 29 and the connecting member 24 as shown in FIG. 11E, and the beta pins 30 shown in FIG. The cylindrical body 31 is inserted into the hole 31a and the hole 26a of the retaining pin 26 to keep it from coming off. And it transports in this state. When transporting, the connecting pin 18 may be pulled out from the lower ring 16 and transported together with the beta pin 30 in one place.

  FIG. 12 is a process diagram showing a process of connecting the upper ring 17 to the lower ring 16 by the connecting pin 18 when assembling the work machine at the work site after transportation. First, as shown in FIG. 12A, the retaining pin 26 is pulled out from the state where the connecting pin 18 is fitted to the lower ring 16 and the retaining pin 26 is attached as shown in FIG. Next, as shown in FIG. 12C, the connecting pin 18 is pulled by human power, the longitudinal groove 16a of the lower ring 16 is opened, and the connecting pin 18 is fitted only in the pin hole 16c outside the lower ring 16. And In this way, the vertical groove 16a is left open, the upper swing body 6 is suspended by a crane, and the upper ring 17 is suspended so as to fit into the vertical groove 16a of the lower ring 16 as shown in FIG. Come on. In this case, the position of the pin hole 17 b of the upper ring 17 is aligned with the position of the pin hole 16 c of the lower ring 16.

  Next, the hydraulic cylinder unit 33 is attached to the cylinder attachment portion 9 of the revolving frame 3, and the boss 27 c of the hydraulic cylinder 27 is connected to the connector 24 of the connection pin 28 by the pin 25 as shown in FIG. Then, by extending the hydraulic cylinder 27, the connecting pin 18 is pushed through the pin hole 17b of the upper ring 17 and further pushed through the pin hole 16c inside the lower ring 16. Subsequently, as shown in FIG. 12 (F), the pin 25 is removed from the boss 27c of the hydraulic cylinder 27 and the connector 24. Then, as shown in FIG. 12G, the connecting pin 18 is prevented from being removed by the retaining pin 26, and the retaining pin 26 is retained by the beta pin 30.

  As described above, in the present embodiment, since the connecting pin that connects the lower traveling body 1 and the upper swinging body 6 in a dismountable manner is inserted and removed using the hydraulic cylinder 27, there is insufficient force as in the case of manual operation. There is no problem. In addition, it is possible to easily attach and detach the connecting pin without requiring much labor and labor as in the case of attaching and detaching the lower traveling body and the upper swinging body with bolts that have been conventionally performed. . Further, since only one hydraulic cylinder 27 may be provided as a hydraulic cylinder for attaching and detaching the pin, a large space for accommodating the hydraulic cylinder 27 is not required, and even a relatively small working machine can be realized. It becomes.

  As described above, the present invention has been described by the embodiment. However, when the present invention is implemented, for example, a vertical groove may be provided on the lower surface of the upper ring 17 and the lower ring 16 may be fitted into the vertical groove. In addition, various changes and additions can be made without departing from the scope of the present invention.

  1: Lower traveling body, 2: Turning device, 3: Turning frame, 4: Hydraulic power unit, 5: Driver's cab, 6: Upper turning body, 8: Boom mounting section, 9: Boom cylinder mounting section, 11: Bolt, 12 : Outer ring, 13: bearing, 14: inner ring, 15: circular frame, 16: lower ring, 16a: longitudinal groove, 16c: pin hole, 17: upper ring, 17b: pin hole, 18: connecting pin, 20, 22: Bolt, 24: connector, 25: pin, 26: retaining pin, 27: hydraulic cylinder, 28, 29: ring, 30: beta pin, 33: hydraulic cylinder unit, 34: bracket, 35: pipe, 37: pin, 38: support bracket, 39, 40: bolt, 41: retaining ring, 42, 43: nut

Claims (3)

A swivel type in which a swivel frame is installed on a lower traveling body via a swivel device, a power unit and a driver's cab are mounted on the swivel frame to form an upper swivel body, and a work front is detachably attached to the swivel frame Used in working machines,
One of the lower ring provided on the center frame of the lower traveling body and the upper ring provided on the inner ring of the turning device is provided with a longitudinal groove in the circumferential direction, and the other ring is fitted into the longitudinal groove. In addition, the upper and lower connection of the working machine for connecting the lower traveling body and the upper swinging body in a dismountable manner by inserting connection pins into a plurality of pin holes provided radially at the corresponding positions of the lower ring and the upper ring, respectively. In the pin attachment / detachment device,
A hydraulic cylinder unit for inserting / removing the connecting pin, which is detachably attached to a boom cylinder attaching portion provided in the revolving frame;
The hydraulic cylinder constituting the hydraulic cylinder unit is attached to the outside of the turning device with the piston rod facing the turning center side of the turning device, and at the outer end of the connecting pin and the inner end of the piston rod, An apparatus for attaching and detaching upper and lower connecting pins of a work machine, comprising a connecting portion detachably connected to each other by a pin. A swivel type in which a swivel frame is installed on a lower traveling body via a swivel device, a power unit and a driver's cab are mounted on the swivel frame to form an upper swivel body, and a work front is detachably attached to the swivel frame Used in working machines,
One of the lower ring provided on the center frame of the lower traveling body and the upper ring provided on the inner ring of the turning device is provided with a longitudinal groove in the circumferential direction, and the other ring is fitted into the longitudinal groove. And a method of assembling the working machine for connecting the lower traveling body and the upper swinging body in a dismountable manner by inserting connection pins into a plurality of pin holes radially provided at corresponding positions of the lower ring and the upper ring, respectively. In
A hydraulic cylinder unit for inserting / removing the connecting pin is positioned outside the swivel device at a boom cylinder mounting portion provided in the swivel frame, and a piston rod of the hydraulic cylinder is directed toward the swivel center of the swivel device. Installation,
A first step of pin-connecting a connecting portion at a tip of a piston rod of the hydraulic cylinder to a hydraulic cylinder connecting portion provided at an outer end of the connecting pin;
A second step of inserting the connecting pin into the pin hole of the lower ring and the upper ring by extension of the hydraulic cylinder;
A third step of releasing the pin connection between the hydraulic cylinder connecting portion provided at the outer end of the connecting pin and the connecting portion at the tip of the piston rod of the hydraulic cylinder;
A fourth step of changing the position of the pin hole to be connected to the connecting pin by driving the turning device by a hydraulic power source provided in the hydraulic power unit to turn the upper turning body.
An assembly method of a working machine, wherein the assembly of the lower traveling body and the upper swing body is performed by repeating the first to fourth steps. A swivel type in which a swivel frame is installed on a lower traveling body via a swivel device, a power unit and a driver's cab are mounted on the swivel frame to form an upper swivel body, and a work front is detachably attached to the swivel frame Used in working machines,
One of the lower ring provided on the center frame of the lower traveling body and the upper ring provided on the inner ring of the turning device is provided with a longitudinal groove in the circumferential direction, and the other ring is fitted into the longitudinal groove. And a disassembling method of the working machine for connecting the lower traveling body and the upper swinging body in a dismountable manner by inserting connecting pins into a plurality of pin holes provided radially at the corresponding positions of the lower ring and the upper ring, respectively. In
A hydraulic cylinder unit for inserting / removing the connecting pin is positioned outside the swivel device at a boom cylinder mounting portion provided in the swivel frame, and a piston rod of the hydraulic cylinder is directed toward the swivel center of the swivel device. Installation,
A first step of pin-connecting a connecting portion at a tip of a piston rod of the hydraulic cylinder to a hydraulic cylinder connecting portion provided at an outer end of a connecting pin inserted into a pin hole of the lower ring and the upper ring;
A second step of pulling out the connecting pin from the pin hole of the lower ring and the upper ring by contraction of the hydraulic cylinder;
A third step of releasing the pin connection between the hydraulic cylinder connecting portion provided at the outer end of the connecting pin and the connecting portion at the tip of the piston rod of the hydraulic cylinder;
A fourth step of changing the position of the connecting pin to be pulled out by driving the turning device by a hydraulic power source provided in the hydraulic power unit to turn the upper turning body.
A disassembling method for a working machine, characterized in that the connection between the lower traveling body and the upper turning body by the pins is released by repeating the first to fourth steps.

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