JP5653312B2 - Boom and boom cylinder assembling method and its assembling apparatus - Google Patents

Description

  The present invention relates to a method and an assembling apparatus for assembling a boom and a boom cylinder of a relatively large construction machine to a revolving frame.

  Large construction machines such as demolition machines need to be transported separately from the swivel frame due to restrictions such as weight restrictions. When the boom is transported separately from the revolving frame in this way, it is necessary to carry out assembly after transport as quickly as possible, and therefore, the boom is transported with the boom cylinder attached thereto. Further, when transporting with the boom cylinder attached to the boom, as shown in FIG. 16, in order to enable quick assembly to the swing frame, the boom 71 is attached to the front mounting portion 70 provided on the swing frame. The adapter boss 70a and the boom cylinder 72 mounting boss 70b are provided with an adapter 73 having bosses 73a and 73b having the same spacing and size, and the adapter 73 is attached to the base of the boom 71 and the tip of the boom cylinder 72 by pins 74 and 75. The adapter 73 was transported while being mounted, and the adapter 73 was assembled on the front mounting portion 70 of the turning frame on site (see Patent Document 1).

  However, since the front attachment incorporating such an adapter 73 increases in weight by the amount of the adapter 73, it may exceed the transport limit weight or decrease the running capacity during work due to the increase in the weight of the construction machine. There was a problem.

  In order to solve such a problem, as shown in FIG. 17, the bottom end of the boom cylinder 72 is attached to the boom 71 with a pin 76, and the tube 72 a of the boom cylinder 72 is attached to the boom 71 by a chain, a wire, or the like. The boom 71 and the boom cylinder 72 are supported on the platform of the transport truck during transportation, and the tube 72a of the boom cylinder 72 is attached to a chain block, a wire, etc. The boom 71 was lifted up by a crane while being supported by the tube support member 77.

JP 2010-156168 A

  However, when the support structure for the boom cylinder 72 shown in FIG. 17 is adopted, the boom 71 and the boom cylinder 72 are assembled to the swing frame by hanging the boom 71 almost horizontally by a crane. As a result, the piston rod 72b extends in the direction indicated by the arrow A due to its own weight, making it difficult to connect the turning frame to the front mounting portion 70. Note that when the boom 71 and the boom cylinder 72 are coupled, the boom cylinder 72 is not connected to the hydraulic power source mounted on the revolving frame, and therefore the boom cylinder 72 cannot be contracted.

  In view of the above problems, the present invention provides a boom and boom cylinder assembling method and an assembling apparatus that can prevent the boom cylinder from extending when the boom and boom cylinder are assembled. The purpose is to provide.

The method for assembling the boom and the boom cylinder according to claim 1 comprises:
Pin the bottom end of the boom cylinder to the boom, and attach the boom mounting boss and boom cylinder mounting boss provided at the front mounting part of the revolving frame to the base boss of the boom and the piston rod boss of the boom cylinder. In the method of assembling the boom and boom cylinder that are pinned by aligning the positions of
When the boom is suspended by a lifting device and attached to the revolving frame, the boom cylinder tube is supported by the boom via a tube support member,
Surrounding the outer peripheral surface of the boss of the piston rod of the boom cylinder with a rod fixing member, fixing the rod fixing member to the tube of the boom cylinder to prevent the piston rod from extending,
The boom boss and the piston rod boss are respectively aligned with the corresponding bosses of the swivel frame and pinned by a lifting device.

The method of assembling the boom and boom cylinder according to claim 2 is the method of assembling the boom and boom cylinder according to claim 1,
As the rod fixing member, a belt-shaped member surrounding the outer peripheral surface of the boss of the piston rod is used, and as a means for fixing the belt-shaped member to the tube of the boom cylinder, the belt-shaped member is detachable. Using the mounting member to be mounted,
When the boom and the boom cylinder are pinned to the corresponding boss of the revolving frame, the belt-like member surrounds the outer peripheral surface of the piston rod boss, and the belt-like member is connected to the boom cylinder tube by the mounting member. To prevent the piston rod from extending,
After the boom boss is aligned with the boom mounting boss by a lifting device and connected by a pin, the piston rod boss is brought close to the boom cylinder mounting boss, and the belt-like member is removed from the mounting member. Then, the boss of the piston rod is aligned with the boom cylinder mounting boss and connected by a pin.

The method of assembling the boom and boom cylinder according to claim 3 is the method of assembling the boom and boom cylinder according to claim 1,
As the rod fixing member, a head cover having a width equal to or less than the width of the boss of the piston rod of the boom cylinder and including an outer peripheral mounting portion that covers the outer peripheral surface of the boss is used, and the head cover is attached to the piston rod. As means for fixing to the boom cylinder tube, a rod guard having one end fixed to the head cover and slidably mounted on a guide attached to the boom cylinder tube,
When pinning the boom and the boom cylinder to the boss of the corresponding turning frame, the rod guard is fixed to the guide to prevent the piston rod from extending,
With the head cover attached to the boss of the piston rod, the boss of the boom and the boss of the piston rod are aligned with the corresponding bosses of the swivel frame and connected by pins,
After the connection with the pin, the rod guard is unfixed from the guide.

The boom and boom cylinder assembling apparatus according to claim 4 comprises:
Pin the bottom end of the boom cylinder to the boom, and attach the boom mounting boss and boom cylinder mounting boss provided at the front mounting part of the revolving frame to the base boss of the boom and the piston rod boss of the boom cylinder. In the boom and boom cylinder assembling device for pinning by aligning the positions of
A belt-like member surrounding the outer peripheral surface of the boss of the piston rod of the boom cylinder;
An attachment member attached to the tube of the boom cylinder and detachably fixing the belt-like member to the boss of the piston rod is provided.

The boom and boom cylinder assembly apparatus according to claim 5
Pin the bottom end of the boom cylinder to the boom, and attach the boom mounting boss and boom cylinder mounting boss provided at the front mounting part of the revolving frame to the base boss of the boom and the piston rod boss of the boom cylinder. In the boom and boom cylinder assembling device for pinning by aligning the positions of
A head cover that has a width equal to or less than the width of the boss of the piston rod of the boom cylinder, includes an outer peripheral mounting portion that covers an outer peripheral surface of the boss, and is attached to the piston rod;
A rod guard having one end fixed to the head cover and slidably attached to a guide attached to a tube of the boom cylinder; and a fixture for detachably fixing the rod guard to the guide. And

  According to the present invention, when the boom and boom cylinder are suspended and assembled to the revolving frame, the piston rod of the boom cylinder is fixed to the tube by the rod fixing member, so that the extension of the piston rod is prevented. For this reason, when the boss | hub of a boom cylinder is assembled | attached to the boss | hub of a main body frame, alignment becomes easy and it can assemble a boom cylinder rapidly.

  According to the third and fifth aspects of the present invention, it is possible to carry out only by adding a fixing means for fixing the head cover to the guide to the rod guard and head cover of the existing boom cylinder, and the extension of the piston rod can be prevented at a low cost. Can be performed.

It is a side view showing an example of a construction machine to which an embodiment of an assembling apparatus of the present invention is applied. It is a side view which shows one Embodiment of the assembly method of the boom and boom cylinder by this invention in the state before the assembly to the turning frame of a boom and a boom cylinder. It is a bottom view of the boom cylinder of this embodiment, and shows a state where a rod fixing member is attached to a boss of a piston rod. It is EE expanded sectional drawing of FIG. In this embodiment, it is a side view which shows the state which pinned the boom to the boss | hub of the turning frame. In this embodiment, it is a side view which shows the state which assembled | attached the boom and the boom cylinder to the turning frame. It is a side view of the construction machine which shows the assembly | attachment apparatus which concerns on other embodiment of this invention. FIG. 8 is a side view showing a state before the boom and boom cylinder are assembled to the turning frame in the embodiment of FIG. 7. It is a bottom view of the boom cylinder shown in FIG. It is an enlarged side view which shows the front-end | tip part of the boom cylinder shown in FIG. It is GG sectional drawing of FIG. It is FF expanded sectional drawing of FIG. It is a bottom view of the boom cylinder which shows other embodiment of this invention. FIG. 14 is a cross-sectional view corresponding to FIG. 12 in the embodiment of FIG. 13. FIGS. 14A and 14B are an exploded sectional view and an assembled sectional view showing a rod guard fixing structure in the embodiment of FIG. 13, and FIG. 14C is a bottom view showing a fixing pin retaining structure. It is a side view which shows the assembly apparatus of the boom and boom cylinder using the conventional adapter. It is a side view which shows the assembly apparatus of the boom and boom cylinder using the conventional tube support member.

  FIG. 1 is a side view showing an example of a construction machine to which an embodiment of the assembling apparatus of the present invention is applied. In FIG. 1, reference numeral 1 denotes a lower traveling body, and 2 a revolving frame attached to be revolvable via a revolving device 3. 6 is mounted to constitute the upper swing body 7.

  A front mounting portion 10 for attaching the boom 8 and the boom cylinder 9 is integrally provided at the front portion of the revolving frame 2. The boom 8 of this embodiment is an example of a split boom in which another boom is added to the tip of the boom 8. However, the present invention can also be applied when a general-purpose boom is used instead of the split boom. In this embodiment, an example in which boom cylinders 9 are attached to both sides of the boom 8 is shown. However, the present invention is also applied to a structure in which one boom is attached to the lower side of the boom 8. Is possible. Reference numerals 10a and 10b denote bosses provided on the front mounting portion 10 for connecting the boom 8 and the boom cylinder 9 with pins 11 and 12, respectively.

  FIG. 2 is a side view showing an embodiment of the method for assembling the boom and boom cylinder according to the present invention in a state before the boom and boom cylinder are assembled to the revolving frame 2. As shown in FIG. 2, during transportation and before the boom 8 and the boom cylinder 9 are assembled to the front mounting portion 10 of the swivel frame 2, the boom cylinder 9 has a bottom end portion thereof attached to the boom 8 by a pin 13. The boom cylinder 9 is supported in a state where the boom 8 and the tube 9a of the boom cylinder 9 are connected to each other by a tube support member 14 such as a chain block or a wire. Reference numerals 14a and 14b denote metal fittings for connecting the tube support member 14 attached to the boom 8 and the tube 9a, respectively.

  In this embodiment, as a rod fixing member for preventing the extension of the piston rod 9b of the boom cylinder 9, a band-shaped member 15 surrounding the outer peripheral surface of the boss 9c at the tip of the piston rod 9b is used. As a means for fixing the belt member 9 to the tube 9a of the boom cylinder 9, an attachment member 16 for detachably attaching the strip member is used. 9 d is a hydraulic pipe for supplying hydraulic oil to the rod chamber of the boom cylinder 9.

  FIG. 3 is a bottom view showing a state in which a rod fixing member is attached to the boom cylinder 9 in this embodiment, and FIG. 4 is an enlarged cross-sectional view taken along line EE in FIG. As shown in FIG. 3, the belt-like member 15 has the same width as the boss 9c of the piston rod 9b or a width narrower than the width of the boss 9c. The strip member 15 is preferably made of a flexible material such as a polyamide resin or a cloth.

  As shown in FIG. 4, the attachment member 16 is attached by clamping the tube 9 a with two semicircular metal fittings 16 a and 16 b and fastening the tube 9 a with bolts 17 and nuts 18. The metal fittings 16a and 16b have fastening seats 16c and 16d of the belt-like member 15, respectively. Both ends of the belt-like member 15 are applied to the fastening seats 16c and 16d, and the belt-like member 15 is attached to and detached from the fastening seats 16c and 16d by bolts 19. It has a structure that can be attached. That is, both ends of the belt-like member 15 have holes (not shown) through which the bolts 19 are passed, and the fastening seats 16c and 16d have screw holes (not shown) into which the bolts 19 are screwed. Reference numerals 16e and 16f are openings provided in the fastening seats 16c and 16d for allowing the hydraulic piping 9d to pass therethrough.

  In this embodiment, when the boom 8 and the boom cylinder 9 are pinned to the bosses 10a, 10b of the front mounting portion 10 for front mounting of the corresponding revolving frame 2, as shown in FIGS. The member 15 surrounds the outer peripheral surface of the boss 9c of the piston rod 9b, and both ends of the belt-like member 15 are fastened to the fastening seats 16c and 16d of the mounting member 16 by bolts 19 as shown in FIG. As a result, the piston rod 9b is fixed to the tube 9a of the boom cylinder 9, and the piston rod 9b is prevented from extending. In this state, the boom 8 and the boom cylinder 9 are lifted by a lifting device such as a crane, and the base portion of the boom 8 and the boss 9c at the tip of the piston rod 9b are used as the boom and boom cylinder mounting boss of the front mounting portion 10 of the revolving frame 2. Move to 10a, 10b side. The main body side of the construction machine may be moved to the boom 8 and boom cylinder 9 side by traveling and turning.

  Thereafter, as shown in FIG. 5, the boss 8 a (see FIG. 2) at the base part of the boom 8 is aligned with the boom mounting boss 10 a of the revolving frame 2 and connected by the pin 11. The belt-like member 15 is removed from the boss 9c of the piston rod 9b, and the boss 9c of the piston rod 9b is connected to the boom cylinder mounting boss 10b of the revolving frame 2 by a pin 12.

  Here, when the boss 9c of the piston rod 9b of the boom cylinder 9 is aligned with the boss 10b of the front mounting portion 10, the boom 8 is supported by a main rope (not shown) of a lifting device such as a crane. At the same time, after the tube 9a is suspended by an auxiliary rope (not shown) or a chain block (not shown) and the boom 8 is connected to the boss 10a by the pin 11, the position of the boss 9c of the boom cylinder 9 is set to the position of the boss 10b. Adjacent to some extent. And the strip | belt-shaped member 15 is removed and it connects with the pin 12 according to the position of the boss | hub 9c on the boss | hub 10b.

  Thus, in this embodiment, when the boom 8 and the boom cylinder 9 are suspended and assembled to the front mounting portion 10 of the swivel frame 2, the piston rod 9 b of the boom cylinder 9 is attached by the belt-shaped member 15 and the mounting member 16. Since it is fixed to the tube 9a, the extension of the piston rod 9b is prevented. For this reason, when the boss 9c of the piston rod 9b of the boom cylinder 9 is assembled to the bosses 10a and 10b of the revolving frame 2, the positioning becomes easy, and the boom cylinder 9 can be assembled quickly.

  Further, according to such an assembling method, the conventional adapter 73 shown in FIG. 16 is not required, so that the weight to be transported can be reduced and the weight of the entire construction machine is increased by the weight of the adapter 73. This can be avoided, and the running ability of the construction machine during work is not reduced.

  FIG. 7 is a side view of a construction machine showing another embodiment of the present invention. FIG. 8 is a side view showing a state before the boom 8 and the boom cylinder 9 are assembled to the revolving frame 2. 7 and 8, the same reference numerals are given to the same parts as those in the embodiment shown in FIGS. 1 and 2. 7 and 8, the head cover 22 that fixes the piston rod 9b to the piston rod 9b of the boom cylinder 9 is used as a fixing member that fixes the piston rod 9b to the tube 9a. The head cover 22 is fixed to the tube 9a. As a means, a rod guard 23 having one end fixed to the head cover 22, a guide 24 fixed to the tube 9 a of the boom cylinder 9 and slidably engaged with the rod guard 23, and the rod guard 23 is attached to and detached from the guide 24. Bolts 25 that can be fixed are used.

  For example, in a construction machine used as a dismantling machine, the rod guard 23 prevents a crushing block dropped by a dismantling operation from jumping up from the ground or the like and colliding with the piston rod 9b to damage the piston rod 9b. Particularly, in the structure in which the piston rod 9b is connected to the revolving frame 2 side, the position of the piston rod 9b is lowered, so that such a crushing block or the like easily collides, and the role of the rod guard 23 becomes important.

  9 is a bottom view of the boom cylinder 9 shown in FIG. 8, FIG. 10 is an enlarged side view showing a tip portion of the boom cylinder shown in FIG. 8, and FIG. 11 is a sectional view taken along line GG in FIG. As shown in FIGS. 8 to 11, the head cover 22 has an outer peripheral mounting portion 22a made of a belt-shaped member that is mounted on the outer peripheral surface of the boss 9c of the piston rod 9b, and an attachment that attaches the outer peripheral mounting portion 22a to the tip of the piston rod 9b. A member 22b and a connecting portion 22c with the rod guard 23 are provided. The connecting portion 22c has a cylindrical shape, and is externally fitted to the distal end portion of the tube 9a of the boom cylinder 9 so as to be movable. The head cover 22 and the rod guard 23 are made of steel plates.

  As shown in FIGS. 9 and 11, the outer peripheral mounting portion 22a has a width equal to or smaller than the width of the boss 9c of the piston rod 9b. The attachment member 22b for attaching the outer peripheral mounting portion 22a to the piston rod 9b includes semicircular metal fittings 29, 30 fixed to the piston rod 9b by bolts 27 and nuts 28 with the piston rod 9b sandwiched from both sides, and semicircles thereof. A welding plate 29 is welded to one of the arcuate fittings 29 and 30, and upper and lower ends thereof are provided with a connecting plate 33 fixed to the upper plate portion and the lower plate portion of the outer peripheral mounting portion 22a by bolts 31 and 32, respectively. As shown in FIGS. 9 and 10, one end of the rod guard 23 is connected to the connecting portion 22 c of the head cover 22 by a bolt 35.

  12 is an FF enlarged sectional view of FIG. 8 showing an attachment structure of the guide 24 attached to the tube 9a of the boom cylinder 9. As shown in FIG. 12, 37 and 38 are semicircular metal fittings fixed to the tube 9a by fastening the tube 9a from both sides with bolts 39 and nuts 40. Reference numeral 41 denotes a guide mounting seat welded to one of the semicircular metal fittings 37 and 38. The guide 24 includes left and right vertical plate portions 24a, a horizontal plate portion 24b welded to the lower end thereof, and guide rails 24c welded to both ends of the horizontal plate 24b. The formed part is fixed to the mounting seat 41 with bolts 42 and is attached to the tube 9a. The hydraulic piping 9d of the boom cylinder 9 is inserted between the left and right vertical plate portions 24a and 24a.

  The rod guard 23 has a bent portion 23a bent upward at both ends, and an L-shaped sliding member 23b that is slidably fitted to the guide rail 24c of the guide 24 is welded to the upper surface of the rod guard 23. Become. The rod guard 23 is detachably attached to the lateral plate portion 24b of the guide 24 by bolts 25 and nuts 45.

  In this embodiment, when the boom 8 and the boom cylinder 9 are pinned to the bosses 10a and 10b of the front mounting portion 10 of the corresponding turning frame 2, as shown in FIGS. The rod guard 23 connected by 35 is fixed to the guide 24 by a bolt 25 and a nut 45 (see FIG. 12). As a result, the piston rod 9b is fixed to the tube 9a of the boom cylinder 9, and the piston rod 9b is prevented from extending.

  In this state, the boom 8 and the boom cylinder 9 are lifted by a lifting device such as a crane, and the base portion of the boom 8 and the boss 9c at the tip of the piston rod 9b are used as the boom and boom cylinder mounting boss of the front mounting portion 10 of the revolving frame 2. The front mounting part 10 is moved close to the boom 8 and the boom cylinder 9 by moving to the 10a, 10b side or by running and turning on the construction machine main body side. Thereafter, the boss 8a of the boom 8 is aligned prior to the boss 10a of the front mounting portion 10 and is connected by the pin 11, and then the boss 9c of the boom cylinder 9 is aligned with the boss 10b to be pin 12 Connect by. In this case, the head cover 22 remains attached to the piston rod 9b.

  Thus, in this embodiment, when the boom 8 and the boom cylinder 9 are suspended and assembled to the revolving frame 2, the piston rod 9 b of the boom cylinder 9 is connected to the guide 24 by the rod guard connected to the head cover 22. Since it is fixed to the tube 9a by being fixed, the extension of the piston rod 9b is prevented. For this reason, when the boss 9c of the piston rod 9b of the boom cylinder 9 is assembled to the bosses 10a and 10b of the revolving frame 2, the positioning becomes easy, and the boom cylinder 9 can be assembled quickly.

  Further, according to this embodiment, it is possible to carry out by simply adding bolts 25 and nuts 45 as fixing means for fixing the head cover 22 to the guide 24 to the head cover 22 and the rod guard 23 of the existing boom cylinder 9. This makes it possible to prevent the piston rod 9b from extending at a low cost.

  FIG. 14 is a view corresponding to FIG. 12 showing another embodiment of the present invention in which a pin 47 is used to fix the rod guard 23 to the guide 24. FIG. 15A is an exploded cross-sectional view showing a fixing structure with the pins 47. As shown in FIG. 15A, a pin hole 24 d is provided in the horizontal plate portion 24 b of the guide 24. The rod guard 23 is provided with a pin hole 23c at a location corresponding to the pin hole 24d, and a cylindrical body 23d is welded to the lower surface of the rod guard 23 so as to surround the pin hole 23c. 15 (B) and 15 (C) are provided with pin holes 23e into which retaining pins 48 are inserted.

In this embodiment, when the rod guard 23 is fixed to the guide 24, as shown in FIG. 15 (B), the pin 47 is connected to the pin hole 23c of the rod guard 23 and the pin of the horizontal plate portion 24b of the guide 24. The retaining pin 48 is inserted into the pin hole 47a provided in the pin 47 and the pin hole 23e provided in the cylindrical body 23d, and the ring 48a attached to the retaining pin is attached to the cylindrical body 23d . The pin 47 is prevented from coming off by being hung around. If such a pin 47 is used for fixing the rod guard 23, there is an advantage that the rod guard 23 can be fixed relatively easily.

  Although the present invention has been described above by the embodiments, the present invention can be applied to various large construction machines other than the dismantling machine. Moreover, when implementing this invention, a various change and addition are possible in the range which does not deviate from the summary of this invention.

1: Lower traveling body, 2: Turning frame, 3: Turning device, 4: Power unit, 5: Cab, 6: Counterweight, 7: Upper turning body, 8: Boom, 9: Boom cylinder, 9a: Tube, 9b : Piston rod, 9c: boss, 9d: hydraulic piping, 10: front mounting portion, 10a, 10b: boss, 11, 12, 13: pin, 14: tube support member, 15: strip member (rod fixing member), 16 : Mounting member, 22: head cover, 22a: outer periphery mounting portion, 22b: mounting member, 22c: connecting portion, 23: rod guard (rod fixing member), 24: guide, 24c: guide rail, 25: bolt, 27: bolt , 28: nut, 29, 30: semicircular metal fitting, 33: connecting plate, 35: bolt, 37, 38: semicircular metal fitting, 39: bolt, 40: nut, 41: g Mounting seat for de, 44: Bolt, 45: Nut, 47: Pin, 48: stopper pin

Claims (5)

Pin the bottom end of the boom cylinder to the boom, and attach the boom mounting boss and boom cylinder mounting boss provided at the front mounting part of the revolving frame to the base boss of the boom and the piston rod boss of the boom cylinder. In the method of assembling the boom and boom cylinder that are pinned by aligning the positions of
When the boom is suspended by a lifting device and attached to the revolving frame, the boom cylinder tube is supported by the boom via a tube support member,
Surrounding the outer peripheral surface of the boss of the piston rod of the boom cylinder with a rod fixing member, fixing the rod fixing member to the tube of the boom cylinder to prevent the piston rod from extending,
A method of assembling a boom and a boom cylinder, wherein the boom boss and the piston rod boss are respectively aligned and pinned to corresponding bosses of the revolving frame by a lifting device. In the method of assembling the boom and boom cylinder according to claim 1,
As the rod fixing member, a belt-shaped member surrounding the outer peripheral surface of the boss of the piston rod is used, and as a means for fixing the belt-shaped member to the tube of the boom cylinder, the belt-shaped member is detachable. Using the mounting member to be mounted,
When the boom and the boom cylinder are pinned to the corresponding boss of the revolving frame, the belt-like member surrounds the outer peripheral surface of the piston rod boss, and the belt-like member is connected to the boom cylinder tube by the mounting member. To prevent the piston rod from extending,
After the boom boss is aligned with the boom mounting boss by a lifting device and connected by a pin, the piston rod boss is brought close to the boom cylinder mounting boss, and the belt-like member is removed from the mounting member. A boom and boom cylinder assembly method, wherein the boss of the piston rod is aligned with the boom cylinder mounting boss and connected by a pin. In the method of assembling the boom and boom cylinder according to claim 1,
The rod fixing member has a width equal to or less than the width of the boss of the piston rod of the boom cylinder, and includes an outer peripheral mounting portion that covers the outer peripheral surface of the boss, and uses a head cover attached to the piston rod. As means for fixing to the boom cylinder tube, a rod guard having one end fixed to the head cover and slidably mounted on a guide attached to the boom cylinder tube,
When pinning the boom and the boom cylinder to the boss of the corresponding turning frame, the rod guard is fixed to the guide to prevent the piston rod from extending,
With the head cover attached to the boss of the piston rod, the boss of the boom and the boss of the piston rod are aligned with the corresponding bosses of the swivel frame and connected by pins,
A method of assembling a boom and a boom cylinder, wherein the rod guard is unfixed from the guide after being connected by a pin. Pin the bottom end of the boom cylinder to the boom, and attach the boom mounting boss and boom cylinder mounting boss provided at the front mounting part of the revolving frame to the base boss of the boom and the piston rod boss of the boom cylinder. In the boom and boom cylinder assembling device for pinning by aligning the positions of
A belt-like member surrounding the outer peripheral surface of the boss of the piston rod of the boom cylinder;
A boom and boom cylinder assembly apparatus, comprising: an attachment member attached to a tube of the boom cylinder and detachably fixing the belt-like member to a boss of the piston rod. Pin the bottom end of the boom cylinder to the boom, and attach the boom mounting boss and boom cylinder mounting boss provided at the front mounting part of the revolving frame to the base boss of the boom and the piston rod boss of the boom cylinder. In the boom and boom cylinder assembling device for pinning by aligning the positions of
A head cover that has a width equal to or less than the width of the boss of the piston rod of the boom cylinder, includes an outer peripheral mounting portion that covers an outer peripheral surface of the boss, and is attached to the piston rod;
A rod guard having one end fixed to the head cover and slidably attached to a guide attached to a tube of the boom cylinder; and a fixture for detachably fixing the rod guard to the guide. Boom and boom cylinder assembly device.

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