JP7333260B2 - pile driver - Google Patents

Description

TECHNICAL FIELD The present invention relates to a pile driver, and more particularly to a pile driver equipped with an exhaust gas purification device for purifying exhaust gas discharged from an engine.

Construction machines such as pile drivers, cranes, and hydraulic excavators emit exhaust gas when the engine power unit, which is their power source, is driven. This type of exhaust gas purifier includes a selective catalytic reduction (SCR) device using urea water as a reducing agent, and the SCR catalyst can highly purify NOx in the exhaust gas. Normally, a reducing agent tank that stores urea water is placed in a narrow space away from the engine and other parts. A mounting structure has been proposed in consideration of ease of assembly and maintainability, such as making it possible (see, for example, Patent Document 1).

JP 2017-172141 A

In recent years, due to the tightening of exhaust gas regulations, it has become necessary to install a reducing agent tank even in pile drivers. In particular, a compact pile driver, which requires a compact body, has a problem that the layout of the reducing agent tank tends to be subject to design restrictions.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a pile driver having a supporting structure for a reducing agent tank that enables effective use of a limited mounting space.

In order to achieve the above object, the pile driver of the present invention comprises: a lower traveling body having crawlers; The upper revolving body is equipped with jack devices provided at four locations on the front, back, left and right of the body, a leader provided at the front of the upper revolving body so as to be able to rise and fall, and a work device capable of moving up and down along the front surface of the leader. The body has a frame body in which a box-shaped main frame having a swivel bearing attached to its lower surface and floor frames provided on both left and right sides of the main frame are integrally connected, and the jack device It consists of a pair of left and right front jacks arranged forward with the floor frame interposed therebetween and a pair of left and right rear jacks arranged rearward. In a pile driver equipped with an exhaust gas purifying device that purifies with a reducing agent and equipped with a house that can accommodate them integrally, the working device and the engine power unit are pulled through the main frame. A hydraulic pipe joint is provided between the front jack and the floor frame, which are connected to each other by a hydraulic pipe that is turned, and which can separate the hydraulic pipe in the middle with the side wall of the main frame as a boundary. A space for connecting or disconnecting the hydraulic pipe on the working device side is formed in the hydraulic pipe joint, and the floor frame supports a reducing agent tank in which the reducing agent is stored so as to be able to move in and out of the space. It is characterized in that a tank support structure is provided.

Further, the tank support structure includes a storage case that stores the reducing agent tank, an overlapped portion provided between the storage case and the floor frame, and a pivot pin penetrating the overlapped portion in the vertical direction. , between an entering position where the housing case is moved into the space and a retracted position where the housing case is moved out of the space, the housing case is configured to be rotatable about the axis of the rotating pin. and

Further, a gap is formed in the housing case by separating the reducing agent tank from the rotating pin so that the reducing agent pipe can be routed. It is characterized in that it has a size that allows displacement of the reducing agent pipe due to the rotation of the containing case while it is still connected to the reducing agent tank.

In addition, the upper surface of the storage case is formed flat to serve as a scaffold that allows movement between the upper surface of the house, and the sides of the storage case are provided with elevating steps. and

According to the pile driver of the present invention, a space is formed between the front jack and the floor frame for connecting or disconnecting the hydraulic piping on the working device side, and the reducing agent tank is installed in the space in the floor frame. A tank support structure is provided so that it can be moved in and out. If the reducing agent tank is supported inside the space, it can be mounted compactly along the side of the house. The work space required for maintenance can be secured. That is, it is possible to obtain a supporting structure for the reducing agent tank that can effectively utilize the limited mounting space on the vehicle body.

Further, since the tank support structure has a vertically oriented pivot pin and the container case for the reducing agent tank is configured to be rotatable around the pivot pin, the container case can be moved in a horizontal plane. be possible. Thus, even if the reducing agent tank storing the reducing agent is heavy, it can be stably supported in a cantilevered state, and the operation of moving it from the entering position to the leaving position or vice versa can be easily performed manually. In particular, since the height position and inclination of the storage case do not change at either the entry position or the exit position, when replenishing the reducing agent, the position where the liquid supply port of the reducing agent tank is away from the vehicle body (exit position). , you can work in a safe posture.

BRIEF DESCRIPTION OF THE DRAWINGS It is a side view of the pile driver which shows the example of one form of this invention. It is also a side view of the base machine. It is also a front view of the base machine. It is also a plan view of the base machine. It is a side view which shows a tank support structure. It is also a plan view. It is a side view which shows the modification of a tank support structure. It is also a plan view.

1 to 8 are diagrams showing the pile driver of the present invention. As shown in FIG. 1, the pile driver 11 is composed of a lower traveling body 12 having crawlers 12a and an upper revolving body 14 provided on the lower traveling body 12 so as to be rotatable via a revolving bearing 13. a base machine 15, a leader 16 erected on the front part of the upper revolving body 14, and a leader hoisting cylinder 17 supporting the leader 16 from behind. A leader support 18 for supporting the leader 16 so that it can rise and fall is provided at the front part of the upper rotating body 14 , and hydraulic hoses 19 , electric cables, etc. are provided behind the leader 16 above the front part of the upper rotating body 14 . A pipe guide arm 20 is provided for supporting a plurality of pipes. Furthermore, front jacks 21 and rear jacks 22 are provided as jack devices for stability at four locations on the front, back, left and right of the upper revolving body 14 , and a rear end portion of the upper revolving body 14 is provided with a jack for balancing the pile driver 11 . A counterweight 23 is mounted.

The reader 16 includes a basic reader 25 rotatably attached to a support shaft 24 provided on the reader support 18 in the width direction of the base machine, an upper reader 26 connected to the upper part of the basic reader 25, and a basic reader. 25 is divided into a lower leader 27 connected to the lower part thereof, and the upper reader 26 is divided into a plurality of leader members. These leader members are connected by flange members at the upper and lower ends, and are detachable using bolts and nuts. A top sheave 28 is arranged at the upper end of the upper leader 26, and a detachable anti-vibration member 29 is arranged at the front of the lower part of the lower leader 27, respectively. A pair of left and right guide pipes 31 , 31 are provided continuously over the entire length of the leader 16 at the front ends of both side surfaces of the rack member 30 , which is one of the constituent parts of the leader 16 .

An auger 32, which is an example of a working device, is provided with a pair of left and right guide gibs 32a, 32a which are in sliding contact with the guide pipes 31, 31, projecting rearward, and are meshed with racks provided on both sides of the rack member 30. A pair of right and left pinions are rotated by the auger lifting hydraulic motor 32b to move up and down along the front surface of the leader 16. As shown in FIG. When using this pile driver 11 at a construction site, for example, a steel pipe pile is used as a construction member. The steel pipe pile 33 is connected via a rod cap 35 to the lower end of a drive rod 34 attached through a gear case 32c, and driven by an auger driving hydraulic motor 32d to rotate the rod cap 35 while driving the auger 32. It is pressed into the ground by lowering it.

As shown in FIGS. 2 to 4, the upper revolving body 14 includes a rectangular box-shaped main frame 36 to which the revolving bearing 13 is attached on the lower surface, and floor frames 37 framed on both sides of the main frame 36 in the vehicle width direction. , 38 are integrally connected, and various large parts are mainly mounted on the main frame 36 . In addition, the jack device has a pair of left and right front jacks 21 and 21 at the front and a pair of left and right rear jacks 22 at the rear on both sides in the front-rear direction with the floor frames 37 and 38 interposed therebetween. By extending jack cylinders 21b and 22b having ground plates 21a and 22a at their lower ends, the vehicle body can be stably supported. In particular, the front jack 21 is provided with a jack arm 21c capable of grounding the jack cylinder 21b near the side surface of the leader 16, thereby improving stability during piling work.

A driver's cab 39 is installed in the front part of the floor frame 37 on the right side for operating the auger 32, the upper revolving body 14, the lower traveling body 12, and the like. A device storage house 40 for storing hydraulic devices (not shown) such as a hydraulic oil tank is provided at the rear portion of the floor frame 37 on the right side. On the other hand, on the left floor frame 38, there are a plurality of related devices such as an engine power unit, an attached fuel tank, and an exhaust gas purifier as a hydraulic power unit for supplying pressure oil when driven by the engine. (not shown) is provided. Each house 40, 41 is formed in a substantially rectangular box shape, and is provided with a plurality of inspection doors 41a (opposite side not shown). A staircase 41b and a handrail 41c for preventing falling are provided on the front side of the engine storage house 41, so that maintenance of equipment on the vehicle body can be performed by going up to the house.

Although not shown, the engine power unit is cantilevered on the engine mounted on the floor frame 38 in a vibration-proof state and on the rear side of the engine opposite to the side where the cooling fan exists. and a hydraulic pump device. A radiator facing the cooling fan is provided on the front side of the engine on the floor frame 38, that is, on the upstream side in the flow direction of the cooling air from the cooling fan. Further, a fuel tank is arranged in the engine storage house 41 near directly below the stairs 41b.

An air cleaner 42 installed on an upper surface 41d of an engine storage house 41 is connected to the intake pipe of the engine so that fresh air (external air) sucked by the air cleaner 42 can be supplied to each cylinder of the engine. ing. On the other hand, the exhaust pipe of the engine is provided with an exhaust gas purifying device that complies with higher exhaust gas regulations. The exhaust gas purifying device includes a selective reduction catalyst (SCR) that uses urea water as a reducing agent, and an injection nozzle that is arranged upstream of the SCR in the exhaust pipe and injects urea water toward the exhaust gas in the exhaust pipe. etc. As a result, the exhaust gas after combustion is purified by the exhaust gas purification device, and then discharged to the outside from the exhaust port 43 provided in the upper part of the engine storage house 41 . Specifically, when the urea water is injected, the decomposition reaction of the urea water in a high-temperature atmosphere produces ammonia, and NOx in the exhaust gas is reduced by the ammonia to be decomposed into water and nitrogen. there is

When the engine is driven, the necessary power is obtained from the engine power unit, for example, pressurized oil for operating the auger lifting hydraulic motor 32b and the auger driving hydraulic motor 32d. can do Here, the auger 32 and the engine power unit are connected to each other by a plurality of hydraulic hoses routed through the main frame 36 . From the standpoint of ease of assembly and maintenance, the hydraulic hose is connected to the outer portion of the main frame 36, that is, the auger side hydraulic hose 19 in a separable manner. Specifically, between the front jack 21 and the floor frame 38, a hydraulic piping joint (hose joint) that can separate the auger side hydraulic hose 19 with the side wall 36a as a boundary is provided between the front jack 21 and the floor frame 38 at the exposed side wall 36a of the main frame 36. 44 are provided. As a result, a space 45 for connecting or disconnecting the auger side hydraulic hose 19 to or from the hydraulic piping joint 44 is formed in the space sandwiched between the front jack 21 and the floor frame 38 in the longitudinal direction.

By the way, since the floor frame 38 is mounted with many devices such as an exhaust gas purifying device in addition to the engine power unit, its external dimensions are large in the front-rear direction. As a result, the side area of the main frame 36 where the hydraulic pipe joint 44 is provided is eroded by the floor frame 38 and narrowed. Due to these circumstances, the space 45 has a size that allows connection or disconnection of the auger side hydraulic hose 19, but the space 45 is only wide enough for the jack arm 21c to be curved forward. It's a cramped space. In particular, in the small pile driver 11 that requires a compact body, there arises a problem that the reducing agent tank (urea water tank) for storing the urea water cannot be housed in the engine storage house 41 no matter what. ing.

Therefore, in order to enable the mounting of the reducing agent tank in the space 45 between the front jack 21 and the floor frame 38, which is a limited space of the vehicle body, the floor frame 38 is provided with a reducing agent tank that moves in and out of the space 45. A tank support structure is provided to provide support.

As shown in FIGS. 5 and 6, the tank support structure 46 includes a housing case 48 housing the reducing agent tank 47, an overlapping portion 49 provided between the housing case 48 and the floor frame 38, and the overlapping portion 49. and a rotating pin 50 passing through in the vertical direction. The floor frame 38 and the storage case 48 are arranged side by side in the front-rear direction with their outer surfaces 38a, 48a aligned with each other. The frame-side brackets 38b, 38b and the pair of upper and lower case-side brackets 48b, 48b are superimposed in a nested manner to form an overlapping portion 49. A moving pin 50 is inserted. With this rotating mechanism, the storage case 48 moves between an entering position (solid line in FIG. 6) moved into the space 45 and a retracted position (imaginary line in FIG. 6) moving out of the space 45. It is possible to rotate (horizontally turn) around the axis 50 over an angular range of at least 90 degrees.

The storage case 48 is formed to be slightly larger than the outer shape of the reducing agent tank 47, so that the reducing agent tank 47 can be accommodated with room. By doing so, it can be fixed at the entering position. An openable and closable lid 48d is provided on the upper front side of the storage case 48 at a position corresponding to the liquid supply port cap 47a of the reducing agent tank 47. By opening the lid 48d, the reducing agent tank 47 is opened. can be replenished.

A gap 53 is formed inside the storage case 48 to allow routing of a reducing agent pipe (urea water hose) 51 and a cooling pipe (cooling water hose) 52 by separating the reducing agent tank 47 from the rotating pin 50 . It is The size of the gap 53 is set so that the reducing agent pipe 51 and the cooling pipe 52 are connected to the connecting portion 47b provided on the upper surface of the reducing agent tank 47, respectively, and the sizes of the pipes 51 and 52 along with the rotation of the storage case 48 are adjusted. It is a size that allows displacement. Further, each of the pipes 51 and 52 is connected to a reducing agent pump device (not shown) installed on the floor frame 38, and by operating the reducing agent pump device, the reducing agent pipe 51 is connected to the exhaust gas. Urea water is supplied to the purifier, and a cooling pipe 52 circulates cooling water between the engine and the reducing agent tank 47 . Here, each of the pipes 51 and 52 is routed with a certain degree of slack in the gap 53, and the slack length reaches its maximum when the storage case 48 is rotated from the entering position to the leaving position. It is set longer than the length that is pulled when it rotates.

The upper surface 48e of the storage case 48 is formed flat to serve as a scaffolding that can be moved between the upper surface 41d of the engine storage house 41. Accordingly, the lower portion of the storage case 48 has: A lifting step 54 is provided in which a tread surface 54a is formed by recessing the outer surface 48a. Here, if there is some margin in the arrangement of the storage case 48, as a modified example of the structure of the elevating step, for example, the elevating step can be formed in a convex shape. Specifically, as shown in FIGS. 7 and 8, on the lower front surface 48f of the storage case 48, a lifting step 55 is provided with a tread surface 55a having a non-slip finish. In addition, a chamfered portion 55b having an appropriate size is provided at an inner corner portion of the elevating step 55 so as to avoid contact with the adjacent jack arm 21c.

In the pile driver 11 formed in this way, when the engine power unit is mounted at the manufacturing site, various parts are first mounted on the floor frame 38 in order from large parts such as the engine, and then the rear part of the engine. A hydraulic pump device is attached to , and piping is connected to a fuel tank, a hydraulic oil tank, a reducing agent tank 47 , etc., and then attached to the main frame 36 . At this time, the hydraulic hoses from the hydraulic pump device are temporarily connected to the control valves in the main frame 36, and the plurality of hydraulic hoses connecting the control valves and the hydraulic piping joints 44 are used as the main hydraulic hoses on the power unit side. It is routed within the frame 36 .

Subsequently, the hoisting jigs are fixed to the prepared left and right houses 40, 41 and sequentially attached to the corresponding floor frames 37, 38 by the hoisting operation of the crane. By attaching the air cleaner 42 and the like to the upper surface 41d of the engine storage house 41, the mounting of the engine power unit is completed. After that, various large-sized parts such as the leader 16 and the auger 32 are attached to the upper rotating body 14 through a plurality of processes related to assembly of the lower part such as a jack device.

Here, the auger side hydraulic hose 19 is connected at its base end to the hydraulic pipe joint 44, is guided along the pipe guide arm 20 in a restricted state, and is restrained at the arm tip (J-shaped bent portion) 20a. It is untied and connected in an unrestrained state to hydraulic connector 32e provided on auger 32 (FIG. 1). The operation for connecting the auger-side hydraulic hose 19 will be described below with reference to FIGS. 5 and 6. FIG.

First, the storage case 48 held at the entry position is rotated to the withdrawal position and moved out of the space 45 . At this time, the reducing agent pipe 51 and the cooling pipe 52 are pulled and displaced (moved in position) by the movement of the storage case 48 , but the length of the displacement is absorbed by the slack set in the gap 53 . Subsequently, using the crawler 12 a as a foothold, the operator enters the space 45 and connects all of the plurality of auger-side hydraulic hoses 19 to the hydraulic piping joints 44 . After retreating from the space 45 , the storage case 48 is rotated from the retracted position to the entering position and moved into the space 45 . At this time, the reducing agent pipe 51 and the cooling pipe 52 are pushed and displaced by the movement of the housing case 48, and return to their original set positions. Finally, by fixing the storage case 48 to the floor frame 38 with the fixing bracket 48c and the plurality of bolts 48g, the connection work of the auger side hydraulic hose 19 is completed.

After completing the hose connection between the auger 32 and the upper revolving body 14, the pile driver 11 is in a completed state through the process of supplying fuel, hydraulic oil, and urea water. For example, pressurized oil for operating the auger lifting hydraulic motor 32b and the auger driving hydraulic motor 32d is obtained, and various operations including lifting and rotating the auger 32 bring about a state in which the piling function can be exhibited.

Thus, according to the pile driver 11 of the present invention, the space 45 for connecting or disconnecting the auger side hydraulic hose 19 is formed between the front jack 21 and the floor frame 38. 3, since the tank support structure 46 is provided to support the reducing agent tank 47 so as to be able to move in and out of the space 45, the reducing agent tank 47 can be placed in the space 45 and supported. 47 can be mounted in a compact manner, and if it is supported outside the space 45, a work space required for assembly and maintenance can be secured. That is, it is possible to obtain a support structure for the reducing agent tank 47 that can effectively utilize the limited mounting space on the vehicle body.

Further, since the tank support structure 46 has a vertically oriented pivot pin 50, and the housing case 48 of the reducing agent tank 47 is configured to be rotatable around the pivot pin 50, the housing case 48 can be placed on a horizontal plane. It is possible to move within As a result, even if the reducing agent tank 47 storing the reducing agent is heavy, it can be stably supported in a cantilever state, and the operation of moving it from the entry position to the withdrawal position or vice versa can be easily performed manually. . In particular, since the height position and inclination of the storage case 48 do not change at either the entry position or the exit position, when replenishing the reducing agent, the liquid supply port of the reducing agent tank 47 should be positioned away from the vehicle body (retreat position). position), you can work in a safe posture.

Further, a gap 53 through which the reducing agent pipe 51 can be routed is formed in the accommodation case 48 near the pivot pin 50 , and the size of the gap 53 is such that the reducing agent pipe 51 can be maintained in a connected state while maintaining the connection state of the reducing agent pipe 51 . Since it has a size that allows displacement of the reducing agent pipe 51 accompanying the rotation of 48, it is possible to avoid unreasonable routing of the reducing agent pipe 51 and to provide a degree of freedom of movement. As a result, it is not necessary to remove the reducing agent pipe 51 each time the assembly is performed, and productivity can be improved by shortening the lead time. In particular, in maintenance, the amount of work required to replace the auger side hydraulic hose 19 can be reduced, and in addition, the need to reconfigure the operation settings of the exhaust gas purifying device is eliminated, resulting in a significant reduction in the amount of work. be done.

In addition, since the upper surface 48e of the storage case 48 is formed flat, it becomes a scaffolding that allows movement between the upper surface 41d of the engine storage house 41. safety is ensured. Moreover, since the elevating steps 54 and 55 are provided on the side surface of the housing case 48, it is easy to step on the foot during elevating, and the scaffolding can be moved without difficulty. In particular, the concave elevating step 54 prevents the tread surface 54a from protruding from the width of the vehicle even when provided on the outer side surface 48a of the housing case 48, while the convex elevating step 55 prevents the front surface of the housing case 48 from protruding. 48f has the advantage that the tread surface 55a can be expanded in the depth direction of the storage case 48. As shown in FIG. In either form, it is possible to dispose the housing case 48 and the lifting steps 54 and 55 in the space 45 without impairing the function of the rotating mechanism in the tank support structure 46 . As a result, the narrow space between the front jack 21 and the floor frame 38 can be effectively used, thereby realizing the pile driver 11 with high practicality.

It should be noted that the present invention is not limited to the embodiments described above, and the tank support structure employs a rotating mechanism to make it lightweight, inexpensive, and easy to handle. Other mechanisms may be adopted as long as they can be supported so that they can enter and exit the space. For example, a drawer mechanism having slide rails can be adopted. In addition, the size of the gap provided in the storage case can be appropriately changed in consideration of the amount of movement so that the routing of the reducing agent pipe is not constricted. Furthermore, if concave and convex steps are provided at the same time, it is beneficial as a safety measure for the boarding/alighting route.

DESCRIPTION OF SYMBOLS 11... Piling machine, 12... Lower traveling body, 12a... Crawler, 13... Revolving bearing, 14... Upper revolving body, 15... Base machine, 16... Leader, 17... Leader hoisting cylinder, 18... Leader support, 19... Hydraulic pressure Hose 20 Piping guide arm 20a Arm tip 21 Front jack 21a Grounding plate 21b Jack cylinder 21c Jack arm 22 Rear jack 22a Grounding plate 22b Jack cylinder 23 Counterweight 24 Support shaft 25 Basic leader 26 Upper leader 27 Lower leader 28 Top sheave 29 Anti-vibration member 30 Rack member 31 Guide pipe 32 Auger 32a Guide gib 32b Hydraulic motor for lifting auger 32c Gear case 32d Hydraulic motor for driving auger 32e Hydraulic connector 33 Steel pipe pile 34 Drive rod 35 Rod cap 36 Main frame 36a Side wall , 37, 38... Floor frame 38a... Outside surface 38b... Frame side bracket 39... Driver's cab 40... Equipment storage house 41... Engine storage house 41a... Inspection door 41b... Stairs 41c... Handrail 41d Upper surface 42 Air cleaner 43 Exhaust port 44 Hydraulic pipe joint 45 Space 46 Tank support structure 47 Reducing agent tank 47 a Fluid supply port cap 47 b Connecting part 48 Housing case , 48a...Outside surface 48b...Case side bracket 48c...Fixing bracket 48d...Lid body 48e...Top surface 48f...Front surface 48g...Bolt 49...Overlapping part 50...Rotating pin 51...Reducing agent pipe , 52... cooling pipe, 53... gap, 54... elevating step, 54a... tread surface, 55... elevating step, 55a... tread surface, 55b... chamfered portion

Claims (4)

a lower traveling body equipped with crawlers; an upper revolving body provided on the upper part of the lower traveling body so as to be able to turn via a revolving bearing; jack devices provided at four locations on the front, back, left and right of the upper revolving body; Equipped with a leader that can be raised and lowered at the front of the upper revolving structure, and a work device that can move up and down along the front of the leader,
The upper revolving body has a box-shaped main frame with a revolving bearing attached to its lower surface, and a frame body in which floor frames provided on both left and right sides of the main frame are integrally connected,
The jack device comprises a pair of left and right front jacks arranged forward with the floor frame interposed therebetween, and a pair of left and right rear jacks arranged rearward,
An engine power unit and an exhaust gas purifying device that purifies exhaust gas from the engine with a reducing agent are mounted on one of the left and right sides of the floor frame, and the pile driver includes a house that can accommodate them integrally,
The work device and the engine power unit are connected to each other by hydraulic piping routed through the main frame,
Between the front jack and the floor frame, there is provided a hydraulic piping joint capable of separating the hydraulic piping along the side wall of the main frame. A space for connecting or disconnecting a pipe is formed, and the floor frame is provided with a tank support structure for supporting a reducing agent tank storing the reducing agent so as to be able to move in and out of the space. Characteristic pile driver. The tank support structure has a storage case that stores the reducing agent tank, an overlapped portion provided between the storage case and the floor frame, and a rotating pin that vertically penetrates the overlapped portion, and The storage case is configured to be rotatable about the axis of the rotating pin between an entering position where the storage case is moved into the space and a retracted position where the storage case is moved out of the space. A pile driver according to claim 1. A gap is formed in the housing case by separating the reducing agent tank from the rotating pin so that the reducing agent pipe can be routed. 3. The pile driver according to claim 2, wherein said pile driver has a size that allows displacement of said reducing agent pipe accompanying rotation of said housing case while being connected to a tank. The upper surface of the storage case is formed flat to serve as a scaffold for moving between the upper surface of the house, and the side surface of the storage case is provided with an elevating step. 4. A pile driver according to item 2 or 3.

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