JP2016169063A - Construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction machine which is set as a structure capable of putting one side door into a closed state, of door parts disposed on a lateral wall.SOLUTION: A construction machine has a door part. The door part has one side lateral door and the other side lateral door 15 folded in a double door state. The one side lateral door and the other side lateral door 15 are freely swingably supported, and have an overlapping part in which an end edge 15a of non-support side of the other side lateral door 15 and an end edge 14a of non-support side of the one side lateral door are overlapped on each other. A center pillar 9 is arranged on the rear side of the overlapping part, a front surface of the center pillar 9 is covered with the end edge 15a, and the end edge 14a is put in a fully-closed state while being covered from a front surface of the end edge 15a. A lock mechanism which locks the door part is provided on the one side lateral door, and the lock mechanism is not provided on the other side lateral door 15. On the center pillar 9, a regulation piece 18 is provided which regulates an opening operation of the other side lateral door 15 by being engaged to the end edge 15a when the one side lateral door is put in an open state.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a construction machine in which a door provided with a device for regulating an opening operation is provided on a side wall, and more particularly to a mobile crane provided with a door provided with a device for regulating an opening operation on a side wall of an upper swing body.

  Among construction machines, for example, a mobile crane typified by a crawler crane includes an upper swing body and a lower travel body that supports the upper swing body from below so that the upper swing body can turn freely and travels. On the upper swing body, a long boom for hanging a hook device used for hanging various loads (crane work) via a hanging rope and a winch for winding the hanging rope are provided. Yes.

An upper revolving body of a mobile crane that performs such crane work is provided with an engine that operates a winch, a cooling device that cools the engine, and an engine guard that houses a hydraulic oil tank that operates a boom. Yes.
Since the engine, the hydraulic oil tank, and the like housed in the engine guard need to be regularly maintained, a maintenance work door is provided on the side wall of the engine guard.

An example of the door portion is a door made of two doors. A lock mechanism is provided on at least one of the two doors. This locking mechanism restricts both of the two doors from being opened when a crane operation or the like is being performed. That is, the lock mechanism maintains the fully closed state of the door.
As a structure for securely locking the door portion, for example, a locking mechanism for a passenger door of an automobile can be cited, and for example, there is one disclosed in Patent Document 1.

  Patent Document 1 discloses that the first and second doors pivoted on the edge of the opening are rotated to open and close the opening, and the free ends of the doors in the closed state are inward. A bridge member that is bridged to the opposite edges of the opening, a first locking means that removably fixes the bridge member to the edge, and the doors independently of each other. And the 2nd and 3rd locking means engaged / disengaged to the said bridge | crosslinking member is disclosed.

JP-A-8-142680

  Even if it is going to employ | adopt the lock mechanism of patent document 1 for each door of the door part made into the double doors provided in the side wall of the engine guard of a mobile crane, each door of this door part is thin flat plate shape. Therefore, the lock mechanism of patent document 1 with a complicated structure and weight cannot be provided in each door. Moreover, since the lock mechanism of patent document 1 is a complicated structure, since manufacturing cost will increase, it cannot employ | adopt.

By the way, in the door part of the above-mentioned double doors, there is a door that is closed by overlapping ends (non-support side) opposite to the ends where the doors are supported by hinges or the like.
Even if the lock mechanism disclosed in Patent Document 1 is provided on each door, the lock mechanism provided on the door on one side and the lock mechanism provided on the door on the other side interfere with each other. Therefore, there is a possibility that the door portion cannot be reliably fully closed.

In addition, the environment in which a crane is operated using a mobile crane is mostly an adverse environment in which dust or the like flies. Under such a working environment, for example, a lock mechanism such as dust entering a keyhole. There is a great risk of adverse effects on the environment. Therefore, it is desirable to minimize the number of locking mechanisms provided on the door on the side facing the work environment.
In addition, in the case of the double doors, if a lock mechanism is provided only on one side door and the door on the one side holds the door on the other side in the closed state, both doors are opened when the lock mechanism is released. The Rukoto.

However, when performing maintenance work of the engine or the like with only one side door open, the other side door is not engaged with anything, and thus the open state is reached. That is, the door on the other side that is desired to be closed is also opened, which causes inconvenience in maintenance work.
For example, in cold regions, snow or rain may blow into the engine guard during maintenance work, which may cause troubles such as the engine being frozen. Therefore, it is necessary to keep a door that does not need to be in an open state in a closed state.

  Then, an object of this invention is to provide the construction machine made into the structure which can keep one door closed among the door parts provided in the side wall in view of the said problem.

In order to achieve the above-described object, the present invention takes the following technical means.
The construction machine according to the present invention includes a door portion provided on a side wall, and the door portion includes a door on one side and a door on the other side in a double door shape, and the one side door and the other side door include the side wall. The overlapping portion is supported so as to be rotatable about an axial center facing the vertical direction, and the non-supporting side edge of the other side door overlaps with the non-supporting side edge of the one side door. A center pillar facing in the up-down direction is disposed behind the overlapping portion, and the front side of the center pillar covers an end of the non-supporting side of the other side door, and the other side door is not supported. A lock mechanism that is in a fully closed state in a state where the end side on the non-support side of the one side door is covered from the front surface of the side edge, and the one side door is in a fully closed state to lock the door portion. And a structure in which the lock mechanism is not installed on the other door. In the machine, when the one side door is in an open state, the center pillar has a regulating piece that regulates an opening operation of the other side door by engaging with an end side of the other side door. It is provided.

  Preferably, a base end of the restriction piece is supported so as to be rotatable about an axis oriented in a direction protruding forward from the front surface of the center pillar, and the restriction piece is in a direction along the center pillar. By rotating in the intersecting direction and engaging with the end of the other side door on the non-support side, the other side door becomes locked, and the restriction piece rotates in the direction along the center pillar. And it is good to be comprised so that the said other side door may be in a lock release state by making it non-engage with the edge of the non-support side of the said other side door.

  Preferably, in the closed state of the one side door, the restricting piece is covered with an end side on the non-supporting side of the one side door, and in the open state of the one side door, the restriction by the operator is performed. It is good to be in the state in which the rotation operation of a piece is possible.

  According to the construction machine of this invention, it is set as the structure which can keep one door closed among the door parts provided in the side wall. In particular, in a mobile crane, for example, maintenance work can be easily performed by adopting a structure in which one of the door portions provided on the side wall of the upper swing body can be closed.

1 is a side view schematically showing an overall configuration of a crawler crane according to an embodiment of the present invention. 1 is a rear perspective view schematically showing an overall configuration of a crawler crane according to an embodiment of the present invention. It is a side view which shows roughly the structure of the door part provided in the side wall of an engine guard. It is a side view which shows the structure of the control piece of this invention roughly, and is a figure which shows the non-engagement state of the other side door of the door part by the control piece being cancelled | released. It is a side view which shows the structure of the control piece of this invention schematically, and is a figure which shows the engagement state of the other side door of the door part by the control piece being engaged. It is an AA cross-sectional top view of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In the present embodiment, a mobile crane (crawler crane) of the construction machine 1 will be described as an example with reference to the drawings.
A basic configuration of the crawler crane 1 according to the present embodiment will be described with reference to FIGS. 1 and 2.

  As shown in FIGS. 1 and 2, the crawler crane 1 (hereinafter sometimes simply referred to as a crane) supports the upper swing body 3 and the upper swing body 3 from below so that the upper swing body 3 can swing freely and travels downward. And a body 2. A boom 28 for suspending the hook device 30 via a suspension rope 29 is provided in front of the center of the upper swing body 3 in the width direction. A cab 7 (operating cab) in which an operation unit for operating the boom 28 is provided is mounted in front of one side (right side) in the width direction of the upper swing body 3.

  In describing the crawler crane 1, a position where the traveling direction of the lower traveling body 2 and the axial length direction of the boom 28 provided in the upper swing body 3 coincide with the reference position (home position) of the crawler crane 1. To do. At the reference position of the crawler crane 1, the cab 7 side mounted on the upper swing body 3 is the front direction of the crawler crane 1, and the counterweight 23 side mounted on the upper swing body 3 is the rear direction of the crawler crane 1. To do. Further, one side in the width direction of the upper swing body 3 is the right direction of the crawler crane 1, and the other side in the width direction of the upper swing body 3 is the left direction of the crawler crane 1. This coincides with the direction seen from the operator who has boarded the cab 7.

The lower traveling body 2 of the crane 1 includes endless tracks (crawlers) formed by forming a metal strip in an annular shape at both ends in the left-right direction, and can travel on the ground by the crawler. At the center upper part of the lower traveling body 2, there is mounted a turning means (not shown) for supporting the upper turning body 3 from below so as to turn and turning the upper turning body 3 about the vertical axis. .
The upper swing body 3 is a plate-shaped frame (ladder frame) that is made of steel and has a length in the front-rear direction that is slightly longer than a width in the left-right direction.

A boom 28 that can be raised and lowered is provided on the front side in the width direction of the upper swing body 3, and a hook device 30 is suspended from the tip of the boom 28 via a suspension rope 29. . Further, a hoisting rope 32 is hung around the tip of the boom 28.
On the other hand, a mast 31 around which the hoisting rope 32 is hung and a hoisting winch for hoisting the boom 28 by winding and unwinding the hoisting rope 32 are arranged on the rear side in the center of the upper swing body 3 in the width direction. ing. A counterweight 23 is disposed behind the upper swing body 3.

In addition, a turning unit (not shown) for attaching a turning means of the lower traveling body 2 is disposed at the center lower portion of the upper turning body 3 in the width direction.
Further, behind the boom 28, three winches (first winch 24, second winch 25, and third winch 26) are mounted so as to be arranged in the front-rear direction.
On the left side in the width direction of the upper swing body 3, a cover body 27 having a hollow shape is disposed. Inside the cover body 27, for example, a fuel tank that stores engine fuel and supplies the fuel to the engine, a device for operating the crane 1, and the like are stored.

A cab 7 (cab) is mounted on the right front side of the upper swing body 3 in the width direction, and an engine guard 8 is mounted behind the cab 7 (on the middle to the rear side in the width direction of the upper swing body 3). ing.
The cab 7 is a casing having a large interior, and an operation unit for operating a seat and a crane is provided in the interior, and a passenger door (door) on which an operator can board is provided on the right side. It has been. An operator seated on the seat inside the cab 7 operates the crane by operating the operation unit.

As shown in FIGS. 1 and 2, the engine guard 8 is a metal case body whose interior is a wide space in the front-rear direction, and an engine, a hydraulic oil tank, and the like are stored therein. The front-rear direction and the left-right direction of the engine guard 8 coincide with the front-rear direction and the left-right direction of the crawler crane 1.
Specifically, a hydraulic oil tank, an engine, a fan, and a radiator (both not shown) are stored inside the engine guard 8, and are arranged so as to be arranged vertically, for example, in order from the front. An intake portion (not shown) for sucking cooling air into the engine guard 8 is provided on the rear side wall of the engine guard 8.

The hydraulic oil tank stores therein hydraulic oil for operating a number of hydraulic devices, and is connected to a control valve (main valve) via a hydraulic pipe.
The engine is a power source of the crane 1. The crane 1 is driven by driving the crawler of the lower traveling body 2, and the hoisting device 29 is wound and fed out by driving the winch to lift the hook device 30. Or do a descent.

These engines and hydraulic oil tanks stored in the engine guard 8 need to be regularly maintained in order to maintain performance. Therefore, a door portion 13 that allows communication between the inside and the outside of the engine guard 8 is provided on the side wall of the engine guard 8, for example, the right side wall.
Here, the reason why the door 13 is provided on the side surface of the engine guard 8 will be described below.

As is well known, the crane 1 is a construction machine that is considerably larger than a general excavator, and therefore, the equipment such as an engine built in the engine guard 8 is also larger than a general excavator. For this reason, when performing maintenance work on the device, a large door portion 13 such as a sight door is required on the side wall of the engine guard 8 in view of convenience of access to the built-in device.
On the other hand, a general excavator often performs maintenance work such as opening an upper door and rotating the engine. Since a general excavator is often smaller than the crane 1, the convenience of accessing the device through the upper door is high. Therefore, a large and double door is hardly provided on the side wall of a general excavator.

As described above, the door portion 13 provided in the crane 1 of the present embodiment includes the one-side door 14 and the other-side door 15 in a double-spread shape.
In FIG. 3, since the one side door 14 is on the right side and the other side door 15 is on the left side, the one side door 14 will be referred to as the right side door 14 in the following description of the door portion 13. Similarly, the other door 15 is referred to as the left door 15. 3 is the front side of the right door 14 and the left door 15, and the back side in the paper penetration direction (upper side in FIG. 6) is the right door. 14 and the rear side of the left door 15. This definition is applied when the door portion 13 is described (FIGS. 3 to 6), and the direction shown in FIG. 2 is applied when the entire crane 1 is described.

Now, as shown in FIG. 3, the right door 14 is supported so as to be rotatable around an axial center that faces the right side wall of the engine guard 8 in the vertical direction. The left door 15 is supported (pivotally supported) so as to be rotatable around an axial center facing the vertical direction with respect to the right side wall of the engine guard 8.
The door portion 13 (the kannon door 13) configured by the right door 14 and the left door 15 has an unsupported end side 14a (upward side edge) of the right door 14 and an unsupported left door 15. The non-pivot side end side 15a (the end side facing the up-down direction) has the overlapping portion 16 that overlaps. In the following description, the non-supporting side edge 14a and the non-supporting side edge 15a may be referred to as open sides 14a and 15a.

  On the other hand, a center pillar 9 that faces in the vertical direction is disposed behind the overlapping portion 16 where the open sides 14a and 15a overlap, that is, the engine guard 8 at a position facing the overlapping portion 16. Further, the side pillars 10 that face in the vertical direction are also provided at the engine guard 8 at a position facing the support side edge of the right door 14 and a position facing the support side edge of the left door 15. .

  Center pillar 9 facing the overlapping portion 16, side pillar 10 facing the support side end of the right door 14, or center pillar 9 facing the overlapping portion 16, and the support side end of the left door 15 A space is formed between the side pillar 11 facing the side. That is, the engine guard 8 has an opening 12 that is largely open, and this opening 12 serves as a space for maintenance work.

The opening area of the opening 12 is not particularly limited as long as an operator or the like can enter the engine guard 8 and perform maintenance work. And the right side door 14 and the left side door 15 will be each arrange | positioned in the front side of the opening part 12. As shown in FIG.
That is, the door portion 13 provided on the right wall surface 8a of the engine guard 8 opens the right door 14 and the left door 15 so that the inside and outside of the engine guard 8 communicate with each other. It is configured to enable maintenance work such as a hydraulic oil pump.

  The right door 14 is a metal flat plate, the width in the left-right direction is slightly larger than the width of the opening 12 of the engine guard 8, and the length in the front-rear direction is longer than the length in the front-rear direction of the opening 12 of the engine guard 8. It is said to be long. The right side door 14 is supported by the side pillar 10 of the engine guard 8 about the vertical axis about the right end facing in the vertical direction. The right door 14 is provided with a lock mechanism 17 (details will be described later) that engages the center pillar 9 with the left side edge facing in the vertical direction.

  Therefore, the right door 14 is freely open forward with the side pillar 10 of the engine guard 8 as the center, and is configured to allow maintenance work such as the engine and hydraulic oil pump (FIG. 3). Arrow). Also, the right door 14 has an area that completely covers the opening 12 and is provided with a lock mechanism 17 that locks the right door 14, preventing entry of rain, dust, and the like from the outside during crane operations. Yes.

The left door 15 is a flat plate substantially the same as the right door 14, and the width in the left-right direction and the length in the front-rear direction are also substantially the same as the right door 14. On the other hand, the left side door 15 is supported by the side pillar 11 of the engine guard 8 around the vertical axis, and the lock mechanism 17 is not installed.
Therefore, the left door 15 can be opened forward with the side pillar 11 of the engine guard 8 as a center, and is configured to allow maintenance work such as an engine and a hydraulic oil pump. Further, since the left door 15 has an area that completely covers the opening 12, it prevents entry of rain, dust, and the like from the outside during crane operations.

The right side edge of the left door 15 facing the vertical direction is covered with the left edge of the right door 14 facing the vertical direction in the overlapping portion 16.
In the overlapping portion 16, the front side of the center pillar 9 covers the end of the open side 15a of the left door 15 and the front side of the open side 15a of the left door 15 covers the open side 14a of the right door 14. Closed.

  The lock mechanism 17 provided on the right door 14 locks the door 13 in the fully closed state. The lock mechanism 17 is a general one, and examples thereof include a wheel crane lock mechanism 17 disclosed in Japanese Patent Application Laid-Open No. 2014-133493. That is, the lock mechanism is provided at the upper position on the inner surface side (rear surface side) of the open / close door so as to be able to protrude and retract in the horizontal direction, and engages with a plate provided on the intermediate vertical member in a state of protruding backward. A latch, a second latch that is vertically movable at a lower position on the inner surface side of the opening / closing door, and that engages a plate provided on the intermediate vertical member in a state of protruding downward, and an outer surface side of the opening / closing door An operation handle is provided at an upper position on the (front surface side) and is provided so as to interlock with both the latches via a link or a connecting rod.

The locking mechanism 17 is not particularly limited as long as it is a general one.
By the way, on the front side wall surface of the center pillar 9, when the right door 14 is in the “open state”, it engages with the end of the left door 15 on the non-support side (the right side facing up and down). A restricting piece 18 is provided to restrict the opening operation, that is, to make the left door 15 “closed”.
As shown in FIGS. 4 to 6, the restriction piece 18 is a rectangular plate piece whose front end is bent forward, and the base end of the plate piece is rotatably supported by the substrate 20. Yes. The substrate 20 is a rectangular plate piece that is larger than the plate piece, and is attached to the front surface of the center pillar 9 in the center in the vertical direction with bolts 22 or the like. A support shaft 19 is provided at the center in the vertical direction of the substrate 20 to support the regulating piece 18 so as to be rotatable about the axis. The support shaft 19 is a columnar member and is formed so as to protrude forward (through direction) from the front surface of the substrate 20.

Specifically, the restriction piece 18 is supported by a support shaft 19 whose base end is provided at the center in the vertical direction of the substrate 20 so as to be rotatable about its axis. That is, the restricting piece 18 is supported so as to be rotatable about an axis centered in a direction in which the base end protrudes forward from the front surface of the center pillar 9 with respect to the front surface of the center pillar 9.
As shown in FIG. 4, the restriction piece 18 rotates in the direction along the center pillar 9 and is disengaged from the open side 15 a of the left door 15, so that the left door 15 is unlocked. As shown in FIG. 5, the left door 15 is rotated in a direction intersecting with the direction along the center pillar 9 and engaged with the open side 15 a (upper right side end) of the left door 15. It is configured to be locked. That is, only the right side door 14 is in the “open state” by the restriction piece 18 (see the one-dot chain line in FIG. 2).

  Further, a restriction pin 21 that restricts the rotation of the restriction piece 18 around the axis is provided slightly lower left of the support shaft 19 of the restriction piece 18. The restriction pin 21 is a cylindrical member and is formed so as to protrude forward from the front surface of the substrate 20. The restriction pin 21 restricts the downward rotation of the restriction piece 18 and the unintentional release of the engaged state with the open side 15a accompanying the rotation. In other words, the restriction piece 18 can reliably engage the non-support side end side 15 a of the left door 15 by contacting the lower restriction pin 21.

Furthermore, as shown in FIG. 6, the restriction piece 18 is covered with the open side 14 a of the right door 14 in the closed state of the right door 14, and is restricted by the operator in the open state of the right door 14. The piece 18 can be rotated.
As described above, of the double door 13, only one door (for example, the right door 14) is provided with the lock mechanism 17, and the other door (for example, the left door 15) is not provided with the lock mechanism 17. When the locking piece 17 is released by providing the regulating piece 18 of the present embodiment on the center pillar 9 (the overlapping portion of the door portion 13) and the door 13 is opened, the other door without the locking mechanism 17 is provided. Can be prevented from opening. That is, the door on the other side that is not provided with the lock mechanism 17 can be set in the “closed state”.

Therefore, the other side door that is not provided with the lock mechanism 17 is in the “closed state” by the restriction piece 18 of the present embodiment, so that rain, snow, and dust enter the engine guard 8 during maintenance work of the engine and the like. Can be suppressed.
Moreover, since the restriction piece 18 of the present embodiment has a simple configuration, the operator can easily engage and release it.

In addition, the kannon door 13 has been provided with the lock mechanism 17 in each door so far. However, by providing the center pillar 9 with a restriction piece 18 having a simple structure and an easy mounting method. The number of lock mechanisms 17 can be reduced. Therefore, the manufacturing cost of the door part 13 can be suppressed.
Each embodiment disclosed this time should be considered as illustrative in all points and not restrictive.

In particular, in each embodiment disclosed this time, matters that are not explicitly disclosed, for example, operating conditions and operating conditions, various parameters, dimensions, weights, volumes, etc. of the constituents are within the range normally practiced by those skilled in the art. It does not deviate and employs a value that can be easily assumed by those skilled in the art.
For example, in the present embodiment, the configuration of the restricting piece 18 has been described with respect to the case where the support pillar 19 is pivotally supported on the substrate 20 provided with the support shaft 19 and attached to the center pillar 9. It is good also as a structure which directly provides in 9 and supports the control piece 18 on the support shaft 19 so that rotation is possible. That is, the configuration of the restriction piece 18 is not particularly limited as long as the technology of the present application can be realized.

In the present embodiment, the case where the restriction piece 18 is provided on the right side wall surface 8a of the engine guard 8 has been described. However, the restriction piece 18 is provided on the left side wall surface of the engine guard 8 provided with the double doors 13. Even so, there is no problem.
Further, in the present embodiment, the case where the regulating piece 18 is provided in the center pillar 9 of the engine guard 8 has been described. However, the center pillar of a box (for example, a cover body 27) provided with the double door 13 is provided. You may make it provide in.

  Although the crawler crane 1 has been described as an example, the technology of the present invention can be applied to all construction machines (hydraulic excavators, wheel loaders, etc.) provided with a cover such as an engine guard 8 that protects the engine and the like. It is.

1 Construction machinery (mobile crane, crane)
2 Lower traveling body (crawler)
3 Upper swing body 7 Cab (cab)
8 Engine guard 8a Right side wall 9 Center pillar 10 Side pillar 11 Side pillar 12 Opening part 13 Door part 14 Right side door (one side door)
14a Non-support side end of right door 15 Left door (other door)
15a End of left door on non-supporting side 16 Superposed portion 17 Lock mechanism 18 Restriction piece 19 Support shaft 20 Substrate 21 Restriction pin 22 Bolt 23 Counterweight 24 First winch 25 Second winch 26 Third winch 27 Cover body 28 Boom 29 Suspension rope 30 Hook device 31 Mast 32 Undulating rope

Claims (3)

Having a door provided on the side wall;
The door portion is provided with a one-sided door and the other-side door in a double door shape,
The one-side door and the other-side door are supported so as to be rotatable about an axis that is directed in the vertical direction with respect to the side wall, and an end side on the non-support side of the other-side door, and the one-side door A non-supporting side end of the overlapping portion overlaps,
At the rear of the overlapping portion, a center pillar facing the up and down direction is provided,
The front side of the center pillar covers the non-supporting side edge of the other side door, and the non-supporting side edge of the one side door covers the front side of the non-supporting side edge of the other side door. The one side door is provided with a lock mechanism that locks the door portion in the fully closed state, and the other side door is configured such that the lock mechanism is not installed. In construction machinery
The center pillar is provided with a restricting piece for restricting the opening operation of the other side door by engaging with the non-supporting side edge of the other side door when the one side door is open. A construction machine characterized by The base end of the restricting piece is supported so as to be rotatable about an axis oriented in a direction protruding forward from the front surface of the center pillar with respect to the front surface of the center pillar,
The regulating piece rotates in a direction intersecting with the direction along the center pillar and engages with the non-supporting side edge of the other side door, so that the other side door is in a locked state,
The restriction piece rotates in a direction along the center pillar, and is configured to be non-engaged with the non-support side end of the other side door so that the other side door is unlocked. The construction machine according to claim 1, wherein: In the closed state of the one-side door, the restriction piece is covered by the non-supporting side edge of the one-side door,
The construction machine according to claim 2, wherein in the opened state of the one-side door, the operator can rotate the regulating piece.

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