JP2007063850A - Opening/closing door fixing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an opening/closing door fixing device which stably exerts a vibration preventing function without a risk of the permanent deformation thereof even if an extreme impact load is applied thereto. <P>SOLUTION: A hinge is mounted at one lateral end of the side opening/closing door 16, and a lock mechanism functions to connect and fix the other end of the same to a support 28. The opening/closing door fixing device is formed of a pair of upper and lower stopper members 40 attached to a second reinforcing portion 26 of the side opening/closing door 16, a fixed-side stopper receptacle 42 arranged at an intermediate portion of a mounting plate 41 fixed to the support 28, and adjusting-side stopper receptacles 43 arranged on upper and lower sides of the stopper receptacle 42. Herein a stopper body 48 of the stopper member 40 made of rigid rubber, has upper and lower end faces formed as tapered surfaces 48a, 48a which then abut on tapered surfaces 42a, 43a formed on the fixed-side stopper receptacle 42 and the adjusting-side stopper receptacle 43, respectively. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a construction machine such as a hydraulic excavator, and locks the door such as a side opening / closing cover of a machine room provided on the upper swing body in a closed state and suppresses swinging of the door during the operation of the machine. The present invention relates to an open / close door fixing device that can be used.

  There is a hydraulic excavator as an example of a construction machine. The hydraulic excavator is configured such that an upper swinging body is provided on a lower traveling body having a crawler belt or the like so that the upper swinging body can turn, and a front working mechanism including a boom and an arm and a front attachment such as a bucket is provided on the upper swinging body. In order to drive the hydraulic excavator, an engine and a hydraulic pump are provided, and devices such as a direction switching valve for controlling the direction of pressure oil from the hydraulic pump and a filter for removing foreign substances from the hydraulic oil are installed. Each of these devices is installed behind the part where the front working mechanism and the operator's cab are provided in the swing frame of the upper swing body, and in order to protect these devices, the periphery and upper part are covered with a cover. It constitutes the machine room.

  A part of the side cover of the machine room is a door that can be opened and closed. This side door can be used to inspect equipment, etc. installed in the machine room, and to repair any malfunctions. It is provided for. The machine room is fixedly provided with a partition, a support for supporting the side cover, the upper cover, etc., and the side opening / closing door is provided with a rotating shaft in the vertical direction in the upper swing body. It is opened and closed so as to rotate around the rotation axis. The pivoting shaft of the side opening / closing door is usually composed of a hinge and is opened and closed in the horizontal direction. The hinge is directly attached to a fixed wall portion or a bracket connected to the wall portion is attached as a support portion. The side doors must be kept closed at all times so that they can be opened as needed. For this reason, the end of the opening / closing side opposite to the pivotal fulcrum side of the side opening / closing door is not in a free state, but is provided with a lock mechanism that locks in a detachable manner. The lock mechanism is also provided with an opening / closing operation unit, and means for locking the opening / closing operation unit in an inoperable state.

  Thus, the lock mechanism is provided by connecting the hook member to an operation portion such as a handle that is rotatably provided on the open / close door, and on the other support portion provided inside the machine room. Conventionally, a structure in which a latch that engages with the fixed latch is provided is widely used. Here, since vibration is generated during the operation of the construction machine, the open / close door is held in the closed state by the lock mechanism, but cannot be stably held as it is, and vibrates in the vertical direction. Therefore, in order to prevent noises due to vibrations of the opening / closing doors and damage to the opening / closing doors and hinges, etc., a configuration in which the opening / closing doors are provided with steadying means in addition to the lock mechanism has been widely used.

For example, in Patent Document 1, a locking member is provided on the flange of the partition plate fixed to the upper swing body, and a locking hole is provided on the open / close side of the open / close door so that the open / close door is closed. The locking hole is fitted to a locking member provided in the flange, and the engagement of the locking member and the locking hole suppresses vibration of the open / close door. The locking member has a tapered shape that becomes narrower toward the distal end side, and a tapered flange having substantially the same angle as the taper is formed in the locking hole.
JP 2001-262618 A

  By configuring the steadying means as described above, vibration when the machine is operated with the opening and closing door being closed is suppressed, noise reduction is achieved, and the opening and closing door and a member such as a hinge connected thereto are also provided. However, the configuration of Patent Document 1 is not without problems.

  That is, in order to eliminate the movement of the opening / closing door during the operation of the machine, the engagement between the above-described locking member and the locking hole should be a close-fitting shape. However, while the machine is operated for a long period of time, it slides repeatedly between the locking member and the locking hole, so that a gap is generated between them due to wear or the like. The gap gradually widens. As a result, the swing control function of the door is reduced, and not only is the noise increased, but the door swings up and down around the connection to the hinge so that the connection to the hinge There arises a problem that the shaft may be damaged or the shaft may be deformed.

  In order to improve the above points and to suppress swinging of the door, the present inventor has a stopper member between the opening and closing door and the support member provided on the upper swing body, and the stopper member. It consists of stopper receivers provided at the upper and lower positions, and constitutes anti-sway means that abuts on each other with a tapered surface, and these stopper members and either one of the upper and lower stopper receivers are fixed so that the position can be adjusted vertically. We developed the product and applied for a patent. With this configuration, the stopper member and the stopper receiver can be assembled in close contact with each other so that no gap is generated, and the opening / closing door can be reliably prevented from swinging.

  Here, if either the stopper member or the stopper receiver is formed of an elastic member, even if the stopper member and the stopper receiver are brought into close contact with each other, the stopper member and the stopper receiver are rocked up and down by the amount of elastic deformation caused by the elastic member. There is room to move. For this reason, in the above-mentioned prior invention, both the stopper member and the stopper receiver are made of a metal material such as aluminum which is an incompressible member.

  By configuring the steady rest in this way, even when the maximum vibration occurs in the vehicle when performing operations that can be normally predicted with a general construction machine, the open / close door is held sufficiently stably, and the vehicle The opening / closing door is not swung unduly due to vibrations, etc., and it is possible to prevent the hinge, shaft, etc. from being deformed or damaged. However, a multi-function construction machine that performs a wide variety of work, such as a hydraulic excavator, may be operated under extremely severe conditions, such as a breaker work, so that a significant impact is applied to the open / close door. Sometimes. In the configuration of the above-described steadying prevention means of the invention of the prior application, when using a stopper member and stopper receiver formed of an aluminum material, there is a limit in receiving the load. When an impact is applied, these stopper members or stopper receivers are plastically deformed. If even a part of the stopper member or stopper receiver is plastically deformed, a gap is generated between them, and the steadying function is significantly lowered.

  Of course, if the strength of the steadying means is increased, for example, if the steadying member is composed of a heavy member such as steel, it is possible to prevent deformation even with the impact load described above. It is. However, since either the stopper member or stopper stopper is provided on the open / close door side, providing a heavy object to increase the strength not only hinders the opening / closing operation, but also a large load acting on the hinges etc. This causes problems such as the action of.

  The present invention has been made in view of the above points, and its purpose is to prevent permanent deformation even when an extreme impact load is applied, and to stably exhibit the steady-rest function. An object of the present invention is to provide a swing stopper for an openable door.

  In order to achieve the above-described object, the present invention closes an open / close door that is mounted on an upper swing body of a construction machine and is opened and closed at the other end side by rotating about a rotation shaft provided in a substantially vertical direction. A locking means for locking the opening / closing door in a closed state, and a steady rest for suppressing the opening / closing door from swinging vertically. And the steadying means is provided so as to protrude from either one of the opening and closing door and the support member fixedly provided on the upper swing body. A stopper member and a pair of upper and lower stopper receivers that are provided on the other side and come into contact with upper and lower end surfaces of the protruding portion of the stopper member. The stopper member includes a stopper body made of an elastic member, and the stopper body. The contact surface of the stopper main body with respect to the stopper receiver is thin at the distal end portion, and continuously increases in thickness toward the proximal end side. It has a tapered surface shape, and the contact surface on the stopper receiving side has a tapered surface shape corresponding to the tapered surface.

  When an impact load is applied to the stopper member that is in close contact with the stopper receiver, it is absorbed by the elastic force, but this stopper member is elastically deformed only when an extremely large load is applied, Hardness that does not substantially elastically deform due to vibrations or the like that normally act on the substrate. For this purpose, the stopper body of the stopper member is formed of, for example, hard rubber, and the rubber hardness is set to 70 to 90 degrees, preferably about 80 degrees. The range of elastic deformation is such that the hinge supporting the door is not damaged. Generally, a hinge has some warp, and even if it vibrates to some extent, an excessive force does not act on the hinge within the range of this head. Therefore, in order to limit the amount of elastic deformation of the stopper member in the stopper body, a portion having a small thickness formed between the tapered surface of the stopper body and the core member is used as a load acting portion. Thus, the degree of elastic deformation of the stopper member can be adjusted.

  Either the stopper member or the stopper receiver may be provided on the open / close door side. However, since the open / close door is the movable side, the stopper member is attached to the open / close door, and the stopper receiver is attached to the support member side of the upper swing body. It is more reasonable to put on. A plurality of stopper members can be provided in the vertical direction. A necessary number of stopper members can be provided according to the height direction dimension of the open / close door. For example, two stopper members can be provided so that the height position can be adjusted in the vertical direction. On the other hand, on the support member side, a fixed stopper receiver whose upper and lower ends are in contact with the stopper member and a fixed stopper stopper arranged on the upper and lower sides of this fixed side stopper receiver, the position adjustment is performed so that the other end of the stopper member contacts. It can comprise from a pair of upper and lower adjustment side stopper receivers attached. In order to be able to adjust the position of the stopper member and the stopper receiver, for example, a configuration is adopted in which the stopper member and the stopper receiver are detachably fixed to the open / close door and the support member, respectively, with bolts. In this case, the adjustable stopper member and the stopper receiver are configured to form an opening larger than the outer diameter of the bolt at least in the vertical direction. As a result, when the gap between the stopper member and the stopper receiver is enlarged due to wear or the like, the position of the stopper member is adjusted with the bolt loosened, and the bolt is tightened at that position, so that the top and bottom of the stopper member are It will be fixed in the state which contacts.

  According to the present invention, by adopting the above configuration, the open / close door provided in the construction machine can be stably held over a long period in a closed state, noise can be reduced, and the hinge can be deformed and There are effects such as being able to suppress damage.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. Here, in the following description, what is constituted as a side opening / closing door in a machine room of a hydraulic excavator is shown, but the present invention is not necessarily limited thereto.

  First, FIG. 1 shows an overall configuration of a hydraulic excavator as an example of a construction machine. In FIG. 1, reference numeral 10 denotes a lower traveling body, and the lower traveling body 10 is provided with a pair of left and right traveling means 11, 11 having crawler belts. An upper revolving unit 12 is installed on the lower traveling unit 10 so as to be able to turn. The upper turning body 12 is provided with a front working mechanism 13 including a boom 13a, an arm 13b, and a bucket 13c at a position on the front side thereof, and operations such as excavation of earth and sand are performed by the front working mechanism 13. Further, the bucket 13c in the front work mechanism 13 is detachably connected to the tip of the arm 13b, and work other than excavation can be performed by attaching another front attachment. A driver's cab 14 is provided adjacent to the front working mechanism 13, and the operator operates the operating means including a lever or the like provided in the driver's cab 14 in the driver's cab 14. The mechanism 13 and the like can be operated.

  This hydraulic excavator is driven by hydraulic pressure for traveling by the traveling means 11, turning of the upper swing body 12, and operation of the front working mechanism 13. For this purpose, the hydraulic excavator is provided with a hydraulic pump and an engine that drives the hydraulic pump. A hydraulic oil tank for supplying hydraulic oil to the hydraulic pump and a fuel tank for supplying fuel to the engine are also provided. Furthermore, a battery for supplying power to a direction switching valve for controlling the direction of the pressure oil from the hydraulic pump, devices such as filters, a control panel provided in the cab 14 and other electric devices is also mounted.

  The various devices and tanks described above are installed behind the cab 14 and the front work mechanism 13. Among these, the tanks can be installed in a state exposed to the outside, but at least each device other than the tanks is installed in a machine room 15 covered with a cover. The cover constituting the machine room 15 is made of a thin steel plate from the viewpoint of weight reduction and the like, and a partition made of a pillar or a thick steel plate is fixedly provided as a high-strength structural member at an appropriate position in the room. Some of the covers are fixedly attached to these structural members, but the other part of the covers can be opened and closed. This is because, when a failure occurs in various devices installed in the machine room 15, each device is inspected, and if necessary, measures such as repairs are taken. Therefore, a part of the side covers constituting the machine room 15 is configured as a side opening / closing door 16 that can be opened and closed. The side opening / closing door 16 is provided so as to be supported by the above-described structural member directly or by a support portion made of a bracket or the like connected to the structural member.

  FIG. 2 shows the configuration of the side opening / closing door 16. As is apparent from this figure, a pair of upper and lower hinges 20, 20 are attached to one end of the side opening / closing door 16, and the bolt 21 protrudes from one plate body of both the hinges 20. The bolt 21 is fixed to a support portion 22 fixedly provided in the machine room 15 with a nut 23. Accordingly, the hinge 20 constitutes a pivot shaft provided in the vertical direction with respect to the frame of the upper swing body 12, and the side opening / closing door 16 is opened and closed by pivoting in the horizontal direction with the pivot shaft as a fulcrum. Then, the support portion 22 can be opened outward. That is, the side where the side opening / closing door 16 is connected to the support portion 22 by the hinge 20 is the rotation fulcrum position.

  A first reinforcing portion 24 is fixedly provided at an intermediate portion of the side opening / closing door 16, and a locking mechanism is provided at a position closer to the distal end than the first reinforcing portion 24 (position far from the rotation fulcrum position). 25, and a second reinforcing portion 26 is provided on the distal end side of the lock mechanism 25. Here, the first and second reinforcing portions 24 and 26 are hollow beam members having a U-shaped cross section, and have a length that covers almost the entire length of the side opening / closing door 16 in the vertical direction. It is. Further, an anti-sway means 27 is provided at the site of the second reinforcing portion 26. Therefore, the lock mechanism 25 and the steadying means 27 constitute an open / close door fixing device.

  The open / close side of the side opening / closing door 16 is held closed by the lock mechanism 25 when the side opening / closing door 16 is closed. Moreover, even if the vehicle vibrates, the side opening / closing door 16 is prevented from swinging up and down around the rotation fulcrum position formed by the hinge 20 by the action of the steadying means 27. Therefore, a support 28 as a support member is fixedly provided on the frame of the upper swing body 12, and the lock mechanism 25 and the swing prevention means are provided between the support 28 and the side of the side opening / closing door 16. 27 is attached.

  First, as shown in FIG. 3, the lock mechanism 25 is formed with a through hole at a predetermined position on the distal end side of the side opening / closing door 16, and this through hole is an attachment hole 16a. And the hook attachment part 29 which consists of a metal thin plate is fixed to the site | part of this attachment hole 16a by the welding means. A support shaft 30 is provided at an outer portion of the hook attachment portion 29, and a hook member 31 is rotatably supported on the support shaft 30, and a machine room is opened from an opening 29 a formed in the hook attachment portion 29. 15 protrudes to the inside. A spring 32 acts on the hook member 31, and an operation portion 33 is connected to the hook member 31. As a result, the hook member 31 and its operation portion 33 are urged in the arrow direction A in FIG. 3 by the spring 32, and the operation portion 33 comes into contact with the locking protrusion 29 b provided on the hook attachment portion 29 to be in that position. Retained. Further, when the operation unit 33 is rotated in the direction B in the figure by manual operation or the like, the lock is released. The hook member 31 is formed with a locking portion 31a and a sliding portion 31b. The locking portion 31a is substantially parallel to the side opening / closing door 16, and the sliding portion 31b is a locking portion. It is inclined at an acute angle with respect to 31a.

  The hook member 31 provided on the side opening / closing door 16 is engaged with and disengaged from the latch 34 provided on the support 28. The latch 34 is formed by bending a metal plate, and a predetermined length on one end side thereof is an engagement / disengagement portion 34a that engages / disengages with the locking portion 31a of the hook member 31, and a predetermined length on the other end side. The length is a fixed portion 34b fixedly held by the support 28, and a connecting portion 34c is provided therebetween. The connecting portion 34c and the engaging / disengaging portion 34a and the fixing portion 34b are bent at substantially right angles, and the bending directions thereof are opposite directions. That is, the extending direction of the engaging / disengaging portion 34a and the extending direction of the fixing portion 34b are opposite to each other with the connecting portion 34c interposed therebetween. The latch 34 is fixedly attached to a mounting plate 35 provided by being fixed to the support 28 by welding means, using bolt-nut fixing means.

  Next, the configuration of the steadying means 27 is shown in FIGS. First, as shown in FIG. 4, the steadying means 27 is fixed to the support member 28 by a pair of upper and lower stopper members 40 attached to the second reinforcing portion 26 in the side opening / closing door 16 and means such as welding. A fixed side stopper receiver 42 provided in the mounting plate 41 and an adjustment side stopper receiver 43 provided at a position spaced above and below the fixed side stopper receiver 42 by the vertical dimension of the stopper member 40. Is done. Here, in the side opening / closing door 16 whose one end side is supported by a hinge 20 and whose other end is a free end, the free end side swings up and down around the hinge 20 basically. It is for restricting to do.

  As is clear from FIG. 2, the stopper member 40 is positioned at the end side of the hook member 31, is fixed to the second reinforcing member 26, and is disposed at two positions above and below the hook member 31. Yes. On the other hand, the fixed-side stopper receiver 42 is fixed to the mounting plate 41 by means of welding or the like, for example, and the adjustment-side stopper receiver 43 disposed above and below the mounting plate 41 is detachably mounted to the mounting plate 41 with bolts 44. . The fixed-side and adjustment-side stopper receivers 42 and 43 are formed by bending a metal plate, and a steel plate or the like can be used, but a lightweight metal material such as an aluminum plate is used. You can also

  Of the stopper receivers 42 and 43, the stopper receiver 42 located in the middle is fixedly provided. Therefore, the stopper receiver 42 cannot be adjusted in position, but serves as a reference for performing mutual position adjustment. . Further, the position of the adjustment side stopper receiver 43 can be adjusted at least in the vertical direction. Furthermore, although the stopper member 40 is fixed to the second reinforcing member 26 provided on the side opening / closing door 16, the position of the stopper member 40 can also be adjusted.

  When the hook member 31 and the latch 34 are engaged and the side opening / closing door 16 is closed, the stopper member 40 and the stopper receivers 42 and 43 are at least in the vertical direction, as is apparent from FIGS. Adhere to each other to prevent relative movement. For this reason, the opposing surfaces of the stopper member 40 and the stopper receivers 42 and 43 are formed as tapered surfaces inclined by a predetermined angle, and the taper surfaces are brought into contact with each other to ensure adhesion. That is, as will be described later, the upper and lower end surfaces of the stopper main body 48 of the stopper member 40 are tapered surfaces 48a and 48a, and the upper and lower end surfaces of the fixed-side stopper receiver 42 and the adjustment-side stopper receiver positioned above. On the upper end surface of the adjustment-side stopper receiver 43 located on the lower surface and the lower portion of 43, tapered surfaces 42a and 43a are formed so as to correspond to the tapered surfaces 48a provided above and below the stopper member 40, respectively. The tapered surfaces 42a and 43a may be formed on the entire end surfaces of the stopper receivers 42 and 43. However, in order to avoid interference with the stopper member 40 and the like, the tapered surfaces 42a and 43a are formed only on the portion that contacts the stopper member 40. Has been.

  Since the stopper member 40 is provided on the side opening / closing door 16 and the stopper receivers 42 and 43 are provided on the side of the mounting plate 41 connected to the support 28, it is necessary to align them. Of the stopper receivers 42, 43, the stopper receiver 42 positioned in the middle is fixedly provided, but the adjustment-side stopper receiver 43 is fixed to the mounting plate 41 by two bolts 44 at the upper and lower positions so that the position can be adjusted. Yes. The mounting plate 41 is provided with a nut 45 fixed thereto, and is tightened so that the adjustment side stopper receiver 43 is sandwiched between the nut 45 and the head of the bolt 44, and the adjustment side stopper receiver 43 is fixed. The adjustment side stopper receiver 43 is provided with two bolt insertion holes 46 through which the shaft portion 44a of the bolt 44 is inserted, and these bolt insertion holes 46 are elongated in the vertical direction. When the bolt 44 is tightened, the bolt 44 is prevented from rotating by the washer 47.

  Next, the structure of the stopper member 40 is shown in FIGS. As is apparent from these drawings, the stopper member 40 includes a stopper body 48 and a core member 49. The stopper main body 48 is a block-shaped member made of hard rubber. The stopper main body 48 is a fairly hard member such as a rubber hardness of about 80 degrees, but is still a member that can be elastically deformed. The stopper body 48 is fixed to the second reinforcing member 26 with a bolt 50 in a vertically long state, and the tapered surface 48a is formed on the upper and lower end surfaces. The stopper main body 48 is formed with two openings 51 at upper and lower positions where the core member 49 is mounted at a predetermined interval, and the core member 49 is mounted inside these openings 51. The core member 49 is formed of a substantially elliptical ring member having a predetermined thickness that is closely fitted to the opening 51, and the outer peripheral surface thereof is fixed by bonding to the inner wall of the opening 51 of the stopper body 48.

  The stopper member 40 is fixed by inserting bolts 50 provided at two upper and lower positions into the core member 49 and screwing into the nuts 52 provided on the back surface of the second reinforcing member 26, and is prevented from rotating by a washer 53. Has been. Therefore, the core member 49 is not compressed and deformed by tightening the bolt 50, and is made of a high-strength member, such as stainless steel, in order to reliably receive an impact load acting on the stopper member 40. Yes.

  The stopper main body 48 has upper and lower end surfaces that are tapered surfaces 48a. As is apparent from FIG. 8, the tip end portion of the tapered surface 48a is the thinnest. The wall thickness increases as it goes toward the contact side with the reinforcing member 26. Then, based on the thickness of the tip portion, the degree of elastic deformation of the tip end side of the stopper main body 48 formed of a hard rubber that can be elastically deformed is controlled. Therefore, the amount of elastic deformation due to the minimum thickness of the tapered surface 48a of the stopper main body 48 is set smaller than the range in which the tip portion can move without the hinge 20 of the side door 16 being deformed or damaged. Thus, it is possible to absorb the impact without damaging the hinge 20.

  Here, the core member 49 has a long hole shape that is elongated in the vertical direction, and the width dimension is larger than the diameter of the shaft portion 50 a of the bolt 50. Accordingly, the stopper member 40 is fixed in a state where the position of the stopper member 40 is adjusted within a predetermined range with respect to the second reinforcing member 26. Note that the diameter of the head 50 b of the bolt 50 is at least larger than the width dimension in the internal space of the core member 47.

  Accordingly, since the fixed stopper stopper 42 is fixedly provided on the mounting plate 41 provided on the support 28, the side opening / closing door 16 is closed, and the second reinforcing member of the side opening / closing door 16 is provided. A stopper member 40 is attached to 26. The stopper member 40 is mounted on the upper and lower sides of the stopper receiver 42. At the time of mounting, the position of the stopper member 40 is adjusted in the vertical and horizontal directions, and the tapered surface 48a formed on the stopper main body 48 of the stopper member 40 is stopped. 42 is brought into contact with the tapered surface 42a. In this state, the adjustment-side stopper receiver 43 is mounted on the mounting plate 41, and the tapered surface 43a of the adjustment-side stopper receiver 43 is brought into contact with the other tapered surface 48a of the stopper body 48.

  Accordingly, when the side opening / closing door 16 is closed, that is, when the hook member 31 in the lock mechanism 25 is engaged with the latch 34 and the side opening / closing door 16 is locked in the closed state, the stopper member 40 The upper and lower tapered surfaces 48 a come into surface contact with the tapered surfaces 42 a and 43 a of the stopper receivers 42 and 43. Accordingly, the stopper member 40 and the free end of the side opening / closing door 16 to which the stopper member 40 is attached are fixed so as not to swing in the vertical direction.

  When the excavator is operated, the side opening / closing door 16 is normally kept closed. While the hydraulic excavator is in operation, the upper swing body 12 constantly vibrates. As a result, a force that swings up and down acts on the side opening / closing door 16 that is in a cantilever state, but the other end of the side opening / closing door 16 is provided with a steadying means 27, Since the stopper member 40 and the stopper receivers 42 and 43 are in close contact with each other, the side opening / closing door 16 is stably held, and the swinging of the side opening / closing door 16 is suppressed. The attached hinge 20 or the like is not damaged, and noise can be reduced.

  Among the operations by the hydraulic excavator, for example, during a harsh operation such as a breaker operation, the stopper member 40 provided on the side opening / closing door 16 side and the mounting plate 41 erected on the frame of the upper swing body 12 An extremely large impact load may act between the stopper receivers 42 and 43. However, the stopper member 40 has a stopper body 48 made of an elastic member, and since this stopper body 48 is in contact with the stopper receivers 42 and 43, such a shock load is elastically absorbed and the load is released. As a result, the stopper body 48 is restored to its original state by its elastic restoring force. Therefore, the stopper member 40 and the stopper receivers 42 and 43 are not damaged or deformed.

  Thus, although the stopper member 40 is elastically deformed, its rubber hardness is large, and as shown in FIG. 8, the tip side is extremely thin. Therefore, unless the extremely large impact as described above is applied, that is, when the excavator performs normal work such as when excavating earth and sand, the stopper member 40 is not elastically deformed, and the side opening and closing is not performed. The door 16 is stably held without swinging, noise is reduced, and wear on the contact surface between the stopper member 40 and the stopper receivers 42 and 43 is suppressed.

  As shown in FIG. 9, the side opening / closing door 16 is repeatedly opened and closed, and the contact surface between the stopper member 40 and the stopper receivers 42 and 43 is worn while the excavator is in operation for a long time. , There may be gaps between them. In such a case, the bolts 44 and 50 are loosened so that the tapered surface 48a on the stopper member 40 is brought into contact with the tapered surface 42a of the fixed-side stopper 42 fixedly provided on the mounting plate 41, so that the stopper member 40 The stopper member 40 is fixed by tightening the bolt 50 provided on the stopper. Next, the taper surface 43a of the adjustment side stopper receiver 43 is brought into contact with the taper surface 48a on the other side of the stopper main body 48 of the stopper member 40, and the bolts 44 attached thereto are tightened. Fix it. As a result, the stopper body 48 of the stopper member 40 easily and surely comes into surface contact with the fixed side stopper receiver 42 and the adjustment side stopper receiver 43 with the tapered surfaces 48a and 42a and 48a and 43a. The position of the door 16 can be adjusted so that the door 16 can be stably held.

1 is an external view of a hydraulic excavator as an example of a construction machine. It is a disassembled perspective view which shows a side part opening / closing door and its attaching part. It is sectional drawing in the position containing the locking mechanism in the closed state of a side part opening / closing door. It is XX sectional drawing of FIG. It is a principal part enlarged view of FIG. FIG. 6 is a left side view of FIG. 5. It is a disassembled perspective view of a stopper member. It is sectional drawing of the stopper member in an assembly state. It is a figure similar to FIG. 5 which shows the state which loosened the volt | bolt.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Lower traveling body 12 Upper revolving body 15 Machine room 16 Side opening / closing door 20 Hinge 22 Supporting part 25 Locking mechanism 27 Stabilizing means 28 Support 31 Hook member 34 Latch 40 Stopper member 41 Mounting plate 42 Fixed side stopper receivers 42a, 43a, 48a Tapered surface 43 Adjustment side stopper receiver 44, 45 Bolt 46 Bolt insertion hole 48 Stopper body 49 Core member 51 Opening

Claims (3)

The open / close end of the open / close door is fixed to the open / close door, which is mounted on the upper swing body of the construction machine and is opened / closed by rotating about a rotation shaft provided in a substantially vertical direction. On the side, in the open / close door fixing device provided with a locking means for locking the open / close door in a closed state and a steadying means for suppressing the open / close door from swinging in the vertical direction,
The steadying means is provided on the other side of a stopper member provided so as to protrude from either one of the opening / closing door and a support member fixedly provided on the upper swing body. Comprising a pair of upper and lower stopper receivers that contact the upper and lower end surfaces of the protruding portion of
The stopper member includes a stopper body made of an elastic member and a core member mounted in an opening formed in the stopper body, and a contact surface of the stopper body with the stopper receiver has a thin tip portion. There is a tapered surface shape that continuously thickens as it goes to the base end side,
An opening / closing door fixing device characterized in that the contact surface on the stopper receiving side has a tapered surface shape corresponding to the tapered surface. 2. The open / close door fixing device according to claim 1, wherein the elastic member is formed of a hard rubber having a rubber hardness of 70 to 90 degrees. The stopper member is provided on the opening / closing door side in two upper and lower positions so that the height position can be adjusted, the stopper receiver is provided on the support member, and a fixed stopper receiver disposed between the upper and lower stopper members, 2. The opening / closing door fixing device according to claim 1, further comprising an adjustment-side stopper receiver which is disposed above and below the fixed-side stopper receiver and whose height position is adjustable.

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