JP6847528B2 - Construction machinery - Google Patents

Description

The present invention relates to a construction machine, and more particularly to a construction machine having a counterweight mounting portion for detachably mounting a counterweight on the rear portion of an upper swing body having a working device at the front portion.

When transporting large construction machines such as cranes and pile drivers, generally, the lower traveling body, upper swivel body, work equipment and counterweight, which are components, are disassembled and transported separately, and these are transported on site. It is assembled and used. Further, the counterweight is detachably mounted on a counterweight mounting portion projecting below the rear end of the upper swing body, and is provided between the front end of the counterweight mounting portion and the rear end of the upper swing body. The contact prevention wall prevents the counterweight lifted by using an auxiliary crane or the like from colliding with the rear end of the upper swing body and damaging the rear portion of the upper swing body (see, for example, Patent Document 1). ).

Japanese Unexamined Patent Publication No. 2015-178732

In recent years, in order to improve the excavation ability of a small pile driver, the undercarriage of a crawler, which is a traveling body, has been strengthened, and the counterweight has been increased to ensure the stability of the vehicle body. For this reason, since it is necessary to keep the counterweight within the mass limit during transportation, the counterweight can be disassembled and transported even for a small pile driver in the same way as a large one, and it can be safely attached and detached. Is required. However, when the contact prevention wall as described in Patent Document 1 described above is applied, the contact prevention wall is formed of a heavy steel block, so that the contact prevention wall must be separated from the upper swivel body in terms of mass. Not only can the limitation not be satisfied, but also the contact prevention wall and the counterweight mounting portion are attached to the upper swing body in a state of being in close contact with each other, so that there is a problem that disassembly and assembly are not easy.

Therefore, an object of the present invention is to provide a construction machine provided with a contact prevention member that can satisfactorily reduce the impact load when a counterweight collides with the weight while being lightweight.

In order to achieve the above object, the construction machine of the present invention includes a lower traveling body, an upper rotating body rotatably provided on the upper part of the lower traveling body, and a working device provided on the front portion of the upper rotating body. A counterweight mounting portion is provided below the rear end of the upper swivel body, and a counterweight mounted on the counterweight mounting portion is provided between the front end of the counterweight mounting portion and the rear end of the upper swivel body. In a construction machine provided with a contact prevention member for preventing contact with the rear end of the upper swivel body, the contact prevention member is a pair of standing plate members erected on the front portion of the counterweight mounting portion. By arranging the plate surfaces so as to face each other and at intervals in the width direction with the center line of the counterweight mounting portion interposed therebetween, the side edges of the pair of standing plate members and the counterweight can come into contact with each other. It is characterized by being formed in.

Further, in the construction machine of the present invention, the counterweight mounting portion supports a mounting plate capable of supporting the counterweight, a bottom plate arranged below the mounting plate, and the previously described mounting plate with the bottom plate. It is a box-shaped structure formed by combining a plurality of support plates to be formed, and among the plurality of support plates, a pair of support plates at both ends in the width direction of the above-mentioned mounting plate is the lower portion of the standing plate member. It is a feature.

Further, the construction machine of the present invention is characterized in that a hanging portion for lifting by a crane is provided at an upper end portion of the standing plate member. Further, it is characterized in that a box-shaped partition member that can be filled with a weight material is provided on the plate surface of the standing plate member. In addition, a jack cylinder is provided on the lower outer surface of the standing plate member.

According to the construction machine of the present invention, since the side edges of the pair of standing plate members are arranged toward the rear, even if the counterweight collides with the standing plate members from the rear, the bending rigidity is high. It is difficult to bend forward, and the standing plate member does not easily deform. Therefore, even though the contact prevention member is a lightweight flat steel material, the impact load when the counterweight collides can be satisfactorily relaxed. Further, by bringing the front end of the counterweight lifted by a crane or the like into contact with the side edge of the standing plate member, it is possible to position the counterweight in the front-rear direction in a one-sided state with respect to the counterweight mounting portion, and the counterweight can be mounted. Can be done quickly and easily.

Furthermore, by reinforcing the counterweight mounting portion with a standing plate member formed of a thick steel plate, it is possible to improve the strength against bending and compression, and the counterweight mounting portion is formed into a lightweight box shape as a whole. can do. Further, since the pair of standing plate members are largely separated in the width direction of the counterweight mounting portion, the counterweight in contact with the standing plate member is not swung in the turning direction above the mounting plate, and the counterweight Positioning can be performed more stably.

Further, since the machine body can be lifted by a crane or the like by using the hanging portion provided at the upper end portion of the standing plate member, the machine body can be safely lifted. Furthermore, since the partition wall member provided on the plate surface of the standing plate member is formed in a box shape, it is possible to fill the inside with a weight material such as a metal piece to adjust the mass, and the mass can be adjusted within the range of the mass limit. It becomes easy to integrate the upper swing body and the counterweight mounting portion. In addition, since the jack cylinder is provided on the lower outer surface of the standing plate member, it is possible to secure sufficient rigidity and strength to withstand a large jack reaction force generated during construction, and to simplify the mounting structure of the jack cylinder. The manufacturing cost can be reduced.

It is a side view of the pile driver which shows one form example of the construction machine of this invention. It is also a plan view. It is also a side view showing a state in which the counterweight is removed from the base machine. It is also an exploded perspective view of the main part. It is also a side view of the main part. It is also a rear view of the main part.

1 to 6 show an example in which the present invention is applied to a small pile driver. First, as shown in FIGS. 1 and 2, the pile driver 11 includes a base machine 14 on which the upper swivel body 13 is swivelably provided on the lower traveling body 12 via a swivel bearing. The base machine 14 is connected to an upper leader 16 provided on the front portion of the upper swing body 13 so as to be undulating via a leader support 15 and a lower portion of the upper leader 16 provided on the front end portion of the upper swivel body 13. A lower leader 17, a leader undulating cylinder 18 that supports the upper leader 16 from behind, a hose support column 19 that is undulating behind the upper leader 16 at the front of the upper swing body 13, and the hose support column. A hose support column undulating cylinder 20 that supports 19 from the rear and jack cylinders 21 provided at four locations on the front, rear, left and right sides of the upper swing body 13 are provided, and a counter is provided at the lower rear end of the upper swing body 13. A weight mounting portion 22 is projected, and a plurality of counter weights 23 for balancing the base machine 14 during work are mounted on the counter weight mounting portion 22 in a stacked state.

A pair of left and right guide pipes 24 are continuously provided in the upper leader 16 and the lower leader 17 in the longitudinal direction, and a working device 26 such as an auger drive is provided on the guide pipes 24 via a guide give 25 so as to be able to move up and down. There is. Further, a lower vibration stop 27 is provided at the lower end of the lower reader 17. The work device 26 is a rack and pinion that raises and lowers the work device 26 by driving a pinion that meshes with a rack 28 that is continuously provided on the front surfaces of the upper reader 16 and the lower reader 17 by lifting motors 29 and 29. In addition to being provided with a type lifting device, it is provided with output shaft drive motors 31 and 31 for rotationally driving the output shaft 30 penetrating the work device 26.

The upper swing body 13 is provided with an engine chamber 13a on one side, a driver's cab 13b on the front side on the other side, and an equipment storage chamber 13c on the rear side on the other side. Further, a contact prevention member 32 for preventing contact between the counterweight 23 and the rear end of the upper swing body 13 is provided between the front end of the counterweight mounting portion 22 and the rear end of the upper swing body 13. There is.

As shown in FIG. 3, the pile driver 11 formed as described above is separately transported in a state in which the counterweight 23, which affects the mass limitation, is separated from the base machine 14 in advance.

As shown in FIGS. 4 to 6, the counterweight 23 is a flat and wide block body in which two steel planks are laminated and the periphery is covered with a cover material 23a, which is 2 in the width direction on the upper surface. Hanging metal fittings 33 are attached to the respective locations. Further, positioning members 34 for mutual positioning when the counterweights 23 are stacked up and down are provided at two positions on the upper surface of the counterweight 23 in the width direction. Further, the positioning member 34 is also provided on the upper surface of the counterweight mounting portion 22 in the same manner. Further, the counterweight 23 is a counterweight 23 by fastening a long bolt 35 penetrating the counterweight mounting portion 22 and the counterweight 23 with a nut 36 in a state where all the counterweights 23 are mounted on the counterweight mounting portion 22. They are collectively fixed to the weight mounting portion 22.

Connecting arms 37 for attaching the counter weight mounting portion 22 are fixedly provided at two positions in the width direction at the rear end of the swivel frame 13d of the upper swivel body 13, and the connecting arms 37 in the width direction at the front end of the counter weight mounting portion 22 are fixed. The connecting arm 37 is inserted into the bifurcated portion 38 fixed at two locations, and the locking pin 38a straddling the bifurcated portion 38 is locked to the U-shaped guide groove 37a formed on the upper portion of the connecting arm 37. At the same time, the counter weight mounting portion 22 is fixed via the connecting arm 37 by inserting the fixing pin 39 into the pin insertion holes 37b and 38b provided in the overlapping portion between the connecting arm 37 and the bifurcated portion 38. It will be in a state of being attached to the rear part of 13.

The contact prevention member 32 is integrated with the counterweight mounting portion 22 by erecting a pair of standing plate members 40 formed by having an upright portion 40a extending vertically upward at the front portion of the counterweight mounting portion 22. The plate surfaces of the upright portions 40a face each other, and the counterweight mounting portions 22 are separated from each other in the width direction with the center line in between. In this way, since the side edge 40b of the upright portion 40a is arranged toward the rear, even if the counterweight 23 collides with the standing plate member 40 from the rear, it is difficult to bend forward in the direction of high bending rigidity. , The standing plate member 40 is not easily deformed. Further, by bringing the front end of the counterweight 23 into contact with the side edge 40b of the upright portion 40a, it is possible to position the counterweight 23 in the front-rear direction in a one-sided state with respect to the counterweight mounting portion 22, and the counterweight 23 can be mounted. It can be done quickly and easily.

The counterweight mounting portion 22 includes a wide mounting plate 22a capable of stably supporting the counterweight 23, a bottom plate 22b arranged below the mounting plate 22a, and a mounting plate 22a on the bottom plate 22b. A box in which rectangular openings formed at both ends in the width direction by combining a plurality of support plates 22c to be supported are closed by a plate surface of a crank-shaped refracting portion 40c formed under the pair of standing plate members 40. It is a shape structure. Further, the standing plate member 40 is formed of a steel plate having a wall thickness thicker than that of the support plate 22c (for example, a plate thickness of 32 mm). In this way, since the counterweight mounting portion 22 is reinforced by the vertical plate member 40 of the steel thick plate, it is possible to improve the strength against bending and compression, and the counterweight mounting portion 22 is a lightweight box as a whole. It can be formed into a shape. Further, since the upright portions 40a of the pair of standing plate members 40 are largely separated from each other in the width direction of the counterweight mounting portion 22, the counterweight 23 in contact with the upright portion 40a is swiveled above the mounting plate 22a. The counterweight 23 can be positioned more stably without being shaken by the counterweight.

Further, a hanging portion 40d for lifting by a crane is provided at the upper end portion of the standing portion 40a. As described above, since the position of the hanging portion 40d is higher than the upper surface of the counterweight 23, the counterweight 23 does not get in the way during the lifting work, and the aircraft can be safely lifted.

Further, a box-shaped partition member 41 capable of being filled with a weight material mainly composed of a metal piece such as a ponticus is fixedly provided on both plate surfaces of the upright portion 40a. In this way, since the weight material is stored in the space between the front end of the counterweight 23 and the rear end of the upper swivel body 13, the weight material protrudes to the outside of the machine body and adversely affects the traveling and turning operations. Can be prevented. Further, since the partition member 41 is formed in a box shape, the mass can be easily adjusted only by pouring a metal piece mixed with cement into the inside of the partition member 41 and consolidating it. In addition, since the rear surface 41a of the partition wall member 41 is arranged in parallel with the side edge 40b of the upright portion 40a offset forward by about 10 mm, the counterweight 23 is pressed against the rear surface 41a of the partition wall member 41. It is possible to prevent the partition member 41 from being damaged.

Further, a jack cylinder 21 for stably supporting the machine body is fastened to the outer plate surface of the refracting portion 40c with a plurality of bolts 42 via a mounting plate 21a provided on the peripheral wall of the jack cylinder 21. Since the jack cylinder 21 is mounted along the plate surface of the standing plate member 40 in this way, not only the mounting height of the jack cylinder 21 can be easily adjusted, but also a large jack reaction force generated during construction can be withstood. Rigidity and strength can be ensured.

By providing such a contact prevention member 32, when each counterweight 23 is lifted and stacked one by one on the counterweight mounting portion 22 by a crane or the like, the counterweight 23 is mistakenly operated and moved forward. Even if it shakes, the contact prevention member 32 can prevent the counterweight 23 from colliding with the rear end portion of the upper swing body 13. Therefore, the rear portion of the upper swing body 13 is not damaged by the collision of the counterweight 23, the appearance of the upper swing body 13 can be maintained, and the cost required for repair can be reduced.

Further, since the contact prevention member 32 is formed of the steel thick plate standing plate member 40 that reinforces the counterweight mounting portion 22, the counterweight mounting portion 22 can be formed into a lightweight box shape as a whole. It is possible to integrate the upper swing body 13 and the counterweight mounting portion 22 within the range of the mass limitation, and it is possible to greatly improve the efficiency of disassembly and assembly work. Further, the standing plate member 40 is integrally formed from a standard-sized steel plate by using a thermal cutting machine that performs plasma cutting or gas cutting, so that the structure can be simplified, and it is functional and easy to manufacture. A support structure for the counter weight 23 can be realized.

The contact prevention member may be a standing plate member erected in the front portion of the counterweight mounting portion and may be arranged with the side edges facing rearward. For example, a beam is provided between the plurality of standing plate members. It may be a frame body connected by a member. Further, the shape of the counterweight and the counterweight mounting portion is also arbitrary, and can be formed into an appropriate shape according to conditions such as the rear shape and weight of the upper swing body. Further, when adjusting the mass of the counterweight, the weight material is not limited to being filled inside the partition wall member, and may be filled inside the counterweight mounting portion as needed. Further, in this embodiment, a pile driver is exemplified as a construction machine, but the present invention can be applied to various construction machines such as an earth drill and a crane in which a counterweight is detachably mounted on the rear part of an upper swing body. it can.

11 ... Pile driver, 12 ... Lower traveling body, 13 ... Upper swivel body, 13a ... Engine room, 13b ... Driver's cab, 13c ... Equipment storage room, 13d ... Swivel frame, 14 ... Base machine, 15 ... Leader support, 16 ... upper leader, 17 ... lower leader, 18 ... leader undulating cylinder, 19 ... hose support strut, 20 ... hose support strut undulating cylinder, 21 ... jack cylinder, 21a ... mounting plate, 22 ... counterweight mounting part, 22a ... mounting Plate, 22b ... Bottom plate, 22c ... Support plate, 23 ... Counterweight, 23a ... Cover material, 24 ... Guide pipe, 25 ... Guide give, 26 ... Working equipment, 27 ... Lower vibration, 28 ... Rack, 29 ... Lifting motor , 30 ... Output shaft, 31 ... Output shaft drive motor, 32 ... Contact prevention member, 33 ... Hanging bracket, 34 ... Positioning member, 35 ... Bolt, 36 ... Nut, 37 ... Connecting arm, 37a ... Guide groove, 37b ... Pin insertion hole, 38 ... bifurcated part, 38a ... locking pin, 38b ... pin insertion hole, 39 ... fixed pin, 40 ... standing plate member, 40a ... standing part, 40b ... side edge, 40c ... bending part, 40d ... hanging Part, 41 ... partition member, 41a ... rear surface, 42 ... bolt

Claims (5)

A lower traveling body, an upper swivel body provided so as to be swivel on the upper part of the lower traveling body, and a working device provided on the front portion of the upper swivel body are provided, and a counterweight is placed on the lower part of the rear end of the upper swivel body. A contact in which the mounting portion is projected to prevent contact between the front end of the counterweight mounting portion and the rear end of the upper swivel body between the counterweight mounted on the counterweight mounting portion and the rear end of the upper swivel body. In a construction machine provided with a prevention member, the contact prevention member is a pair of standing plate members erected in front of the counterweight mounting portion, with the plate surfaces facing each other and the counterweight mounting portion. A construction machine characterized in that the side edges of the pair of standing plate members and the counterweight are formed so as to be in contact with each other by arranging them at intervals in the width direction with the center line of the above. The counterweight mounting portion is a combination of a mounting plate capable of supporting the counterweight, a bottom plate arranged below the mounting plate, and a plurality of support plates for supporting the previously described mounting plate with the bottom plate. The construction according to claim 1, wherein the box-shaped structure is formed, and a pair of support plates at both ends in the width direction of the above-mentioned mounting plate among the plurality of support plates is a lower portion of the standing plate member. machine. The construction machine according to claim 1 or 2, wherein a hanging portion for lifting by a crane is provided at an upper end portion of the standing plate member. The construction machine according to any one of claims 1 to 3, wherein a box-shaped partition member capable of filling a weight material is provided on the plate surface of the standing plate member. The construction machine according to any one of claims 1 to 4, wherein a jack cylinder is provided on the lower outer surface of the standing plate member.

Images