JP2010229741A - Lock device for upper turning body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lock device for a upper turning body, which can firmly maintain the locked state of a lock pin for keeping the slewing motion of the upper turning body stopped and a locking hole for undergoing the insertion of the lock pin, by locking the slewing of the upper turning body in two directions, that is, the directions of the forward and backward movements of the construction machinery. <P>SOLUTION: First and second lock plates 10 and 12 are fixed to a round body 6 which is provided in the lower machinery 1. The first and second locking holes 10a and 12a engaged with the lock pin provided in the upper turning body are formed in the first and second lock plates 10 and 12, respectively; and the first and second lock plates 10 and 12 are arranged in portions for locking the slewing motion, in a position in which the upper turning body is directed in the direction of the forward movement and in a position in which the upper turning body is directed in the direction of the backward movement, respectively. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a locking device for an upper swing body that locks the upper swing body in a construction machine such as a hydraulic excavator provided with the upper swing body.

  Conventionally, in this type of construction machine, the upper swing body is used as the lower traveling body in order to prevent the upper swing body from turning carelessly during suspension, transportation or when the construction machine is lifted and transported. It is equipped with a locking device that can be mechanically locked.

  As this type of locking device, for example, a locking device for a construction machine disclosed in Patent Document 1 has been proposed. FIG. 8 shows a cross-sectional view of the locking device provided on the floor of the cab as a prior art of the invention of the present invention.

  As shown in FIG. 8, a lock device 44 is provided on the floor plate 41 a of the cab 41. That is, the locking device 44 provided on the floor board 41a is provided at a position on the floor board 41a, which is a position below the front part of the console 48 arranged on the right side. The lock device 44 includes a lever guide 49, a lock lever 45, and a fixing pin 46 provided at the tip of the lock lever 45. The engaging portion 47a with which the fixing pin 46 engages is formed on the head of the fixing plate 47 provided on the lower traveling body.

  The lever guide 49 is formed in a cylindrical body obtained by bending a thin metal plate or the like into a C-shaped cross section. A slit portion bent in a C-shaped cross section is formed along the upper and lower directions of the cylindrical body, and a mounting flange is integrally formed with the cylindrical body on the lower end side of the lever guide 49. ing. The lever guide 49 is erected on the floor plate 41a by the mounting flange.

  When the direction of the upper swing body 40 is in the forward direction of the construction machine, the position of the fixing pin 46 and the position of the engaging portion 47a formed on the fixing plate 47 can be arranged in a vertically overlapping relationship. When this arrangement relationship is established, the fixing pin 46 can be engaged with the engaging portion 47a by dropping the lock lever 45 along the lever guide 49. Then, the turning motion of the upper turning body 40 can be locked by the lock device 44.

JP 2000-70072 A

  In the lock device for a construction machine described in Patent Document 1, the upper swing body 40 can be locked by the lock device 44 only when the direction of the upper swing body 40 is in the forward direction of the construction machine. . However, when the construction machine is placed on a truck and transported, or when the construction machine is lifted and moved as it is, the upper turning body 40 is set to face the reverse direction of the construction machine, and the upper turning body It may be necessary to lock 40.

  However, in the construction machine locking device described in Patent Document 1, the upper swing body 40 cannot be locked in a state where the upper swing body 40 faces the reverse direction of the construction machine. It has become.

  Further, in the construction machine locking device described in Patent Document 1, the fixing plate 47 is formed as a flat plate made of a steel plate or the like having high rigidity, and the upper end side is obliquely upward with respect to the lower fixing end. It is formed in the shape of a deformed plate that extends by bending. The fixed plate 47 is disposed so as to extend in a direction substantially parallel to the tangent line that contacts the outer periphery of the swivel wheel 42, and the lower end surface of the fixed plate 47 is fixed to the upper surface of the chassis 43 by means such as welding. Yes.

  For this reason, the engaging state of the fixing pin 46 and the engaging portion 47a formed on the head of the fixing plate 47 is engaged based on the thickness of the fixing plate 47. In order to maintain a good engagement state between the fixing pin 46 and the engaging portion 47a, the arrangement position of the fixing pin 46 and the engaging portion 47a with respect to the position in the radial direction from the turning center of the upper turning body 40. Must be arranged with high precision.

  Furthermore, when the fixed pin 46 and the engaging portion 47a are engaged, the turning motion of the upper turning body 40 is stopped. On the contrary, in order to stop the turning motion of the upper swing body 40, a torsional force acts on the engaging portion 47a by the action from the fixing pin 46 provided on the upper swing body side. At this time, if the plate thickness of the fixing plate 47 is thin or if the center position of the fixing pin 46 and the position of the center portion of the plate thickness portion of the fixing plate 47 are shifted, the fixing pin 47 Due to the torsional force caused by the action from 46, there arises a problem that the engagement state between the fixing pin 46 and the engaging portion 47a is released.

  In the present invention, in order to solve these problems, it is possible to lock the upper swing body in two directions, the forward direction and the reverse direction of the construction machine, and to lock the upper swing body to stop the swing motion. The lock state between the pin and the lock hole into which the lock pin is inserted can be firmly maintained, and even if a torsional force acts between the lock pin and the lock hole due to the turning motion from the upper swing body, the lock An object of the present invention is to provide a locking device for an upper swing body that prevents the state from being released.

The object of the present invention can be achieved by the upper revolving body locking device according to claim 1 or 2.
That is, the invention of the present application is a lock device that locks the turning motion of the upper swing body relative to the lower travel body, and the lock device includes a lock pin that can be projected and retracted from the upper swing body side toward the lower travel body side. And a lock plate having a locking hole into which the lock pin is inserted,
The lock plate is fixed on the outer peripheral surface of the round cylinder, which is provided on the lower traveling body and rotatably mounts the upper swing body, along the circumferential direction of the round cylinder, and the lock plate Are provided at two parts, a part on the outer circumferential surface of the round body on the forward direction side of the lower traveling body and a part on the backward direction side of the lower traveling body, respectively. The main feature is that a leg standing from the lower traveling body is provided on one end side of each lock plate in the direction.

  Further, in the present invention, the leg portions of the lock plate provided in the forward direction side portion of the lower traveling body are configured as a pair of leg portions, and the lower traveling body moves forward between the pair of leg portions. The main feature is that the working cylinder of the earth removal blade provided at the tip of the direction is supported.

  In the present invention, since the lock plate is provided in two parts of the outer peripheral surface of the round body, the part on the forward direction side of the lower traveling body and the part on the backward direction side, the upper swing body faces the forward direction. The swivel motion of the upper swing body can be locked at two positions, the position and the position facing the reverse direction.

  Moreover, the lock plate is fixed along the circumferential direction of the round cylinder, and a leg portion standing from the lower traveling body is provided on one end portion side of the lock plate. That is, since the lock plate is disposed along the circumferential direction of the outer peripheral surface of the round cylinder, the contact area when the lock plate is fixed to the outer peripheral surface of the round cylinder can be configured to be large.

  Moreover, since the one end part side of the lock plate is supported by the leg part standing from the lower traveling body, the lock plate can be firmly fixed to the lower traveling body. Furthermore, since the space on the lower surface side of the lock plate on the side where the legs are not provided can be configured widely, piping drawn out from the inside of the cylinder is used on the lower surface side of the lock plate. Can be arranged.

  Furthermore, since the lock pin is engaged with the engagement hole formed in the lock plate, the engagement state between the lock pin and the engagement hole can be firmly configured. Further, since the lock pin can be engaged with the locking hole while sliding on the lock plate, the lock pin can be easily engaged with the locking hole.

  In addition, since the two lock plates can be arranged in positions that are point-symmetric with respect to the center of rotation of the upper revolving structure, the two lock plates are kept in balance in the front-rear direction in the construction machine. A plate can be provided.

  Since the lock plate can be configured in this way, even if a torsional force acts on the lock plate from the upper swing body, the torsional force can be received on the surface of the lock plate, and the circular cylinder can The end face can be supported. As a result, even if a torsional force is applied to the lock plate from the upper swing body, the lock plate can be prevented from peeling off from the outer peripheral surface of the round cylinder, and the upper swing body can be locked in a stable state. Can do.

  As described above, in the upper revolving structure locking device of the present invention, when the construction machine is suspended, when the construction machine is transported on a truck or the like, or when the construction machine is lifted and transported as it is, the turning machine is locked. The direction of the upper revolving body to be placed can be selected from two directions, the forward direction side and the reverse direction side. In addition, since the turning motion of the upper turning body can be locked in a stable state, the turning lock state can be strengthened.

  Also, using the leg portion of the lock plate provided in the forward direction side portion of the lower traveling body, the function of supporting the working cylinder of the earth removal blade provided at the forward end portion of the lower traveling body on this leg portion Can be kept. With this configuration, the lock plate can have a plurality of functions, so that the construction machine can be reduced in weight, and the space portion in the lower surface side portion of the upper swing body can be effectively used. be able to.

It is a perspective view which shows schematic structure of a lower traveling body. (Example) It is a top view which shows the flame | frame structure of a lower traveling body. (Example) It is a front view which shows the frame structure of a lower traveling body. (Example) It is a right view which shows the flame | frame structure of a lower traveling body. (Example) It is a principal part perspective view which shows the lock release state of the upper turning body which faced the front. (Example) It is a principal part perspective view which shows the locked state of the upper turning body which faced the front. (Example) It is a principal part perspective view which shows the locked state of the upper turning body which faced the back. (Example) It is sectional drawing which shows the locked state of an upper traveling body. (Conventional example)

  Preferred embodiments of the present invention will be specifically described below with reference to the accompanying drawings. As the configuration of the upper revolving structure locking device according to the present invention, in addition to the shape and configuration described below, if the shape and configuration can solve the problems of the present invention, those shapes and configurations are adopted. It is something that can be done. For this reason, this invention is not limited to the Example demonstrated below, A various change is possible.

  FIG. 1 shows a schematic configuration of the lower traveling body 1 in a perspective view. As for the frame configuration of the lower traveling body 1, a plan view thereof is shown in FIG. 2, a front view thereof is shown in FIG. 3, and a right side view thereof is shown in FIG.

  As shown in FIG. 2, a conventionally known configuration is adopted as the frame configuration of the lower traveling body 1. A pair of track frames 1b is arranged on both sides of the center frame 1a. A round cylinder 6 on which an upper swing body 2 (see FIG. 5) is pivotably mounted is fixed at the center of the center frame 1a, and a rotary ring 6a is attached to the upper end side of the round cylinder 6.

  The turning wheel 6a is disposed so as to be concentric with the turning center of the upper turning body 2, and is fixed to the upper end of the round body 6 using a plurality of bolts or the like. Then, a driving device (not shown) provided on the upper swing body 2 rotates while meshing with a gear formed on the swing wheel 6a, whereby the upper swing body 2 can be swung. Further, the upper swing body 2 is provided with a cab, a work machine, a counterweight, an engine, etc. (not shown).

  As shown in FIG. 1, a crawler belt 3 is wound around each track frame 1b. On the front side of the center frame 1a, that is, on the forward direction side of the lower traveling body 1, a soil removal blade 4 that is swingably supported by a pair of support arms 15 is provided. One end of the pair of support arms 15 is fixed to the back surface of the soil removal blade 4, and the other end of the pair of support arms 15 is pivotally supported in a boss hole 18a of the flange portion 18 fixed to the center frame 1a. Has been.

Further, a flange portion 5 is fixed to the back surface of the soil removal blade 4, and a boss hole 5a formed in the flange portion 5 and a boss hole formed in the pair of first leg portions 11 fixed to the center frame 1a. By 11a, a working cylinder (not shown) for swinging the soil removal blade 4 can be pivotally supported. The pair of first leg portions 11 is also used as a leg portion for supporting a first lock plate 10 described later.
In the upper part of both end portions on the back side of the soil removal blade 4, there is formed a lifting hole 4a for locking the pulling wire when the construction machine including the lower traveling body 1 is lifted as it is.

  As shown in FIG. 1 and FIG. 2, on the outer circumferential surface of the round body 6, the parts of the lower traveling body 1 in both the forward and backward directions are arranged along the circumferential direction on the outer circumferential surface of the round body 6. The first lock plate 10 and the second lock plate 12 are fixed by welding or the like. For this reason, the edge shapes of the first lock plate 10 and the second lock plate 12 that are fixed to the outer peripheral surface of the round cylinder 6 are configured as curved surfaces that follow the outer peripheral surface of the round cylinder 6.

  A first locking hole 10a and a second locking hole 12a are formed in the first lock plate 10 and the second lock plate 12, respectively. The first locking hole 10a and the second locking hole 12a are used to perform the rotation lock when the upper swing body 2 faces the forward direction and the swing lock when the upper swing body 2 faces the forward direction. In addition, a lock pin 20 (see FIGS. 5 to 7) provided in the upper swing body 2 is configured as a hole to be engaged in each case.

  As shown in FIG. 3, the boss ring 10b is fixed to the upper surface of the first lock plate 10 in the first locking hole 10a, and the lower surface of the second lock plate 12 in the second locking hole 12a is The boss ring 12b is fixed. The height position on the upper surface of the boss ring 10b fixed to the upper surface of the first lock plate 10 and the height position on the upper surface of the second lock plate 12 are configured to be the same height position.

  As shown in FIG. 2, a pair of first legs 11 and a pair of second legs are provided on the edge side of the first lock plate 10 and the edge side of the second lock plate 12 located on the center side of the lower traveling body 1. Each part 13 is fixed. As shown in FIG. 3, the pair of first leg portions 11 and the pair of second leg portions 13 are fixed to the outer peripheral surface of the circular cylinder 6 and the center frame 1a by welding or the like.

  A boss hole 11a is formed in each of the pair of first leg portions 11. The boss hole 11a is formed in the pair of flange portions 5 fixed to the back surface of the soil removal blade 4 shown in FIG. Between the boss holes 5a, one end of a working cylinder (not shown) that swings the soil removal blade 4 is pivotally supported. That is, by extending and contracting an operating cylinder (not shown) supported between the boss hole 11a and the boss hole 5a, the support arm 15 supporting the soil removal blade 4 is moved to the boss hole 18a of the flange portion 18. Can be swung around.

  As shown in FIGS. 3 and 4, the height position on the lower surface of the second lock plate 12 is configured to be higher than the height position on the lower surface of the first lock plate 10 by the plate thickness of the boss ring 12b. With this configuration, a pipe that is piped from the opening 17b of the round body 6 to the traveling motor of the lower traveling body 1 can be arranged using a space formed on the lower surface of the second lock plate 12. become.

  Next, the configuration of the locking device 25 that locks the upper swing body 2 by swiveling will be described with reference to FIGS. 5 to 7 show a revolving frame 2a constituting the upper revolving structure 2, and a cab, an engine room, a working machine, a counterweight, etc. (not shown) are mounted on the revolving frame 2a.

  FIG. 5 shows a state in which the turning lock by the lock device 25 is released in a state where the upper turning body 2 faces the forward direction of the construction machine. FIG. 6 shows a state where the turning lock is performed by the lock device 25 in a state where the upper turning body 2 faces the forward direction of the construction machine. Further, FIG. 7 shows a state in which the turning lock is performed by the locking device 25 in a state where the upper-part turning body 2 faces the reverse direction of the construction machine.

  As shown in FIG. 5 to FIG. 7, the locking device 25 includes a member arranged on the upper swing body 2 side including an operating piece 20, an operating rod 20 b, a fixed pin 20 c and a pin guide portion 21, and a first lock plate 10 and the member disposed on the lower traveling body 1 side composed of the second lock plate 12 is configured.

  The pin guide portion 21 is fixed to the side surface portion of the turning frame 2a, and a through hole is formed in the vertical direction thereof. A fixing pin 20c is inserted into the through hole formed in the pin guide portion 21, and the fixing pin 20c can move up and down from the lower surface of the pin guide portion 21 by moving the through hole in the vertical direction. An operating rod 20b is fixed to the upper end surface of the fixing pin 20c, and the operating rod 20b is configured to have two L cranks overlapped in the vertical direction. An operation piece 20a is fixed to the other end side of the operation rod 20b. A locking hole 23 is formed at the end of the operation piece 20a.

  As an arrangement part of the locking device 25, it can be provided in a front part on the floor surface in the cab (not shown), in the vicinity of a part where the left foot of the worker seated in the driver's seat is placed, It can be placed in a position that does not interfere with the left foot.

  In the cab (not shown), the operation piece 20a is picked up, and the fixing pin 20c is engaged with the first locking hole 10a of the first lock plate 10 or the second locking hole 12a of the second lock plate 12. Or when the fixing pin 20c is engaged with the first locking hole 10a of the first lock plate 10 or the second locking hole 12a of the second lock plate 12. A locking member (not shown) can be provided.

  A locking member provided in a cab (not shown) is engaged with the locking hole 23 of the operating piece 20a, thereby unlocking the operating piece 20a as shown in FIG. It is possible to prevent the operation piece 20a from moving at the two positions including the lock position where the operation piece 20a is dropped as shown in FIG.

  As shown in FIG. 5, when the operation piece 20a is in the unlocked position, the fixed pin 20c is retracted into the through hole of the pin guide portion 21, and the swing frame 2a of the upper swing body 2 is The lower traveling body 1 can freely turn with respect to the center frame 1a.

  On the contrary, when the position of the fixing pin 20c comes to a position overlapping the first locking hole 10a of the first lock plate 10 or a position overlapping the second locking hole 12a of the second lock plate 12, the operation piece 20a When the locking state is released and the fixing pin 20c is freely dropped, the fixing pin 20c is engaged with the first locking hole 10a or the second locking hole 12a as shown in FIGS. I can keep it.

  By the way, the distance between the lower surface of the pin guide portion 21 coming to the position overlapping the first locking hole 10a and the upper surface of the boss ring 10b provided in the first locking hole 10a of the first lock plate 10, and the second The distance between the lower surface of the pin guide portion 21 and the upper surface of the second lock plate 10 that are positioned so as to overlap with the locking hole 12a is the same.

  For this configuration, the length of the fixed pin 20c engaged with the first locking hole 10a and the length of the fixed pin 20c engaged with the second locking hole 12a. The boss ring 10b is provided on the upper surface of the first lock plate 10 and the boss ring 12b is provided on the lower surface of the second lock plate 12 so that the dimensions are the same length. ing. Thus, the distance between the upper surface of the boss ring 10b provided on the first lock plate 10 and the lower surface of the pin guide portion 21 and the distance between the upper surface of the second lock plate 12 and the lower surface of the pin guide portion 21 are kept constant. I can keep it.

  The present invention can be suitably applied to a structure in which the revolving body is rotationally locked in two front and rear directions.

  DESCRIPTION OF SYMBOLS 1 ... Lower traveling body, 1a ... Center frame, 2 ... Upper turning body, 2a ... Turning frame, 4 ... Blade for earth removal, 6 ... Round drum, 10 ... 1st lock plate, 10a ... 1st locking hole, 10b ... Boss ring, 11 ... 1st leg part, 12 ... 2nd lock plate, 12a ... 2nd locking hole, 12b ... Boss ring, 13 ... Second leg, 20 ... Lock pin, 20a ... Operation piece, 20b ... Operation rod, 20c ... Fixed pin, 21 ... Pin guide Part, 25 ... lock device, 40 ... upper revolving body, 41a ... floor board, 43 ... chassis, 44 ... lock device, 45 ... lock lever, 46 ... fixing pin, 47... Fixed plate, 47 a... Engaging portion, 49.

Claims (2)

A locking device that locks the turning motion of the upper swing body relative to the lower traveling body,
The lock device includes a lock pin provided so as to be able to protrude from the upper swing body side toward the lower traveling body side, and a lock plate having a locking hole into which the lock pin is inserted,
Provided on the lower traveling body, on the outer peripheral surface of the round cylinder on which the upper swing body is mounted so as to be rotatable, and along the circumferential direction of the round cylinder, the lock plate is fixed,
The lock plate is provided in two parts, a part on the forward direction side of the lower traveling body on the outer peripheral surface of the round body and a part on the backward direction side of the lower traveling body,
The upper revolving body locking device according to claim 1, wherein a leg portion standing from the lower traveling body is provided on one end side of each lock plate in a circumferential direction of the round body.   The leg portion of the lock plate provided in the forward direction side portion of the lower traveling body is configured as a pair of leg portions, and provided between the pair of leg portions at the forward end portion of the lower traveling body. 2. The upper revolving body locking device according to claim 1, wherein the working cylinder of the earth removing blade is supported.

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