JP6419561B2 - Screw support structure and road machine equipped with screw support structure - Google Patents

Description

  The present invention relates to a screw support structure and a road machine equipped with the screw support structure.

  An asphalt finisher having a screw that extends beyond the vehicle width of the main body and feeds the paving material in the vehicle width direction is known (see Patent Documents 1 and 2).

  In these asphalt finishers, the hydraulic cylinder that moves the screw up and down in the vertical direction to adjust the height of the screw and the screw shaft on the outside in the vehicle width direction when the pavement is sent out from the original position. Some have a screw support structure including an adjustable length rod member that prevents deflection. Note that the length adjusting function is realized by using, for example, a turnbuckle mechanism.

JP 2000-87308 A Japanese Patent Laid-Open No. 2003-232008

  However, one end of the rod member is attached to a bearing that supports the screw on the outer side in the vehicle width direction, and the bearing moves up and down with the screw in the vertical direction. Therefore, when adjusting the height of the screw, the operator needs to remove the bar member from the screw, adjust the length, and then attach it again. This is because the required length of the bar member changes due to the vertical movement of the screw. As a result, each time the operator adjusts the height of the screw, it is necessary to perform complicated operations such as removing the rod member and adjusting the length.

  In view of the above, it is desirable to provide a screw support structure that makes it easier to adjust the height of the screw, and a road machine equipped with the screw support structure.

A screw support structure according to an embodiment of the present invention is a screw support structure that supports a screw that extends beyond a vehicle width of a main body portion of a road machine and feeds a pavement material in a vehicle width direction. It extends along the screw outward in the direction, can be displaced in the vertical direction with respect to the main body together with the screw, and holds the screw rotatably around the screw shaft on the outer side in the vehicle width direction of the main body. A holding member, and a rod member having an invariable length , the first end of which is rotatably attached to the main body portion and the second end of the holding member is rotatably attached to the holding member , on the outer side in the vehicle width direction ; A rotation position adjusting mechanism that adjusts a relative position of the first end with respect to the main body portion on the rotation surface or a relative position of the second end with respect to the holding member on the rotation surface;

  The road machine according to the embodiment of the present invention is equipped with the above-described screw support structure.

  By the above-described means, a screw support structure that makes it easier to adjust the height of the screw and a road machine equipped with the screw support structure are provided.

It is the schematic of the asphalt finisher which concerns on the Example of this invention. It is a figure which shows the structural example of a rotation position adjustment mechanism. It is a top view of a rotation position adjustment mechanism. It is a rear view of a rotation position adjustment mechanism. It is a figure which shows another structural example of a rotation position adjustment mechanism.

  FIG. 1 is a schematic view of an asphalt finisher 100 that is an example of a road machine according to an embodiment of the present invention. Specifically, FIG. 1A is a side view of the asphalt finisher 100 on which the screw support structure 50 is mounted. FIG. 1B is a front view of the screw support structure 50 as seen from the direction indicated by the arrow IB in the plane indicated by the one-dot chain line in FIG. FIG. 1C is a top view of the screw support structure 50 as seen from the direction indicated by the arrow IC in the plane indicated by the two-dot chain line in FIG.

  In this embodiment, the asphalt finisher 100 mainly includes a tractor 1, a hopper 2, a screed 3, and a screw support structure 50.

  The tractor 1 is a mechanism for running the asphalt finisher 100. In this embodiment, the tractor 1 constitutes the main body of the asphalt finisher 100. The tractor 1 moves the asphalt finisher 100 by rotating the front wheels and the rear wheels using a traveling hydraulic motor. The traveling hydraulic motor rotates upon receiving hydraulic oil from a hydraulic source. In addition, a cab including a driver's seat is installed on the upper portion of the tractor 1.

  The hopper 2 is a mechanism for receiving a paving material. In this embodiment, the hopper cylinder 2a is configured to be opened and closed in the vehicle width direction. The asphalt finisher 100 normally accepts a paving material (for example, asphalt mixture) from the loading platform of a dump truck (not shown) with the hopper 2 fully opened. The paving material received in the hopper 2 is fed to the screed 3 via a conveyor (not shown) and the screw 4.

  The screed 3 is a mechanism for spreading and leveling the paving material. In this embodiment, the screed 3 is a floating screed pulled by the tractor 1 and is connected to the tractor 1 via the leveling arm 3a.

  The screw 4 is a mechanism that sends out the paving material fed from the hopper 2 to the rear of the vehicle by a conveyor in the vehicle width direction. In this embodiment, the screw 4 includes a main body screw that fits in the vehicle width of the tractor 1 and an extension (extension) screw that is detachably attached to the main body screw. The screw 4 to which the extension screw is attached extends in the vehicle width direction beyond the vehicle width of the tractor 1. Various extension screws having different lengths can be attached to the main body screw. The screw 4 is configured to be adjustable in height, and is moved up and down in the vertical direction by a height adjusting hydraulic cylinder (not shown).

  The screw support structure 50 is a structure that supports the screw 4. In the present embodiment, the screw support structure 50 prevents the extension screw shaft on the outer side in the vehicle width direction of the tractor 1 from deviating from the original position when the screw 4 sends out the paving material.

  Specifically, the screw support structure 50 mainly includes a holding plate (retaining plate) 51, a front support arm 52, an upper support arm 53, a mounting bracket 54, and a rotation position adjustment mechanism 55.

  The holding plate 51 is a holding member that holds the screw 4 so as to be rotatable around the screw axis on the outer side in the vehicle width direction of the tractor 1 of the asphalt finisher 100. In this embodiment, the holding plate 51 is located in front of the screw 4 and extends along the screw 4 from the tractor 1 to the outside in the vehicle width direction. The holding plate 51 is moved up and down with respect to the tractor 1 together with the screw 4 by a height adjusting hydraulic cylinder.

  The front support arm 52 is a bar member that prevents the screw shaft of the screw 4 from deviating from the original position in the vehicle front-rear direction. In the present embodiment, the front support arm 52 includes a first arm 52a, a second arm 52b, and a third arm 52c.

  One end of the first arm 52 a is connected to the upper part of the leveling arm post 1 a of the tractor 1, and the other end is connected to the upper part of the central post 51 a of the holding plate 51. The second arm 52b has one end connected to the lower part of the leveling arm post 1a and the other end connected to the lower part of the center post 51a. One end of the third arm 52 c is connected to the central portion of the second arm 52 b, and the other end is connected to the outer end in the vehicle width direction of the holding plate 51. In FIG. 1C, the second arm 52b is invisible because it is directly under the first arm 52a.

  Both ends of the first arm 52a, the second arm 52b, and the third arm 52c are connected via a spherical plain bearing. This is to allow vertical movement of the screw 4 and the holding plate 51 within a predetermined range. Further, at least one of the first arm 52a, the second arm 52b, and the third arm 52c may include a length adjustment mechanism such as a turnbuckle mechanism. Further, the front support arm 52 may be composed of one or two arms, or may be composed of four or more arms.

  The upper support arm 53 is a bar member that prevents the screw shaft of the screw 4 from deviating from the original position in the vertical direction. In the present embodiment, the upper support arm 53 has a first end 53 a connected to the mounting bracket 54 and a second end 53 b connected to the rotational position adjusting mechanism 55. Specifically, when the second end 53b is not connected to the rotation position adjusting mechanism 55, the upper support arm 53 rotates the rotation surface (vertical surface) with the first end 53a as the first rotation point. The first end 53a is pin-coupled to the mounting bracket 54 so that it can. The upper support arm 53 has a second end so that the rotation surface (vertical surface) can be rotated using the second end 53b as a second rotation point when the first end 53a is not connected to the mounting bracket 54. 53 b is pin-coupled to the rotational position adjusting mechanism 55. Note that the length of the upper support arm 53 is invariable and does not have a length adjusting mechanism such as a turnbuckle mechanism. Further, the upper support arm 53 may be composed of two or more arms like the front support arm 52.

  The mounting bracket 54 is a member for mounting the first end 53 a of the upper support arm 53 to the tractor 1. In the present embodiment, the mounting bracket 54 is fastened to the side surface of the tractor 1 with bolts.

  The rotation position adjusting mechanism 55 can adjust the position of the rotation point of the upper support arm 53 on the rotation surface in a state where the upper support arm 53 is connected between the tractor 1 and the holding plate 51 (screw 4). It is a mechanism to make. In this embodiment, the rotation position adjusting mechanism 55 is on the rotation surface (vertical surface) of the second rotation point in a state where the upper support arm 53 is connected between the tractor 1 and the holding plate 51 (screw 4). The position of the can be adjusted. This is because the holding plate 51 (screw 4) can be moved up and down in the vertical direction without removing the upper support arm 53. Details of the adjustment of the position of the pivot point will be described later.

  The rotation position adjusting mechanism 55 is also a member for indirectly attaching the second end 53 b of the upper support arm 53 to the holding plate 51. In this embodiment, the rotational position adjusting mechanism 55 is fastened to the upper end of the central post 51a of the holding plate 51 with a bolt.

  Next, a configuration example of the rotation position adjusting mechanism 55 will be described with reference to FIG. 2A is a top view of the rotation position adjusting mechanism 55, and corresponds to an enlarged view of a region indicated by a broken-line circle IIA in FIG. FIG. 2B is a side view of the rotational position adjusting mechanism 55 as seen from the direction indicated by the arrow IIB in the plane indicated by the alternate long and short dash line in FIG. FIG. 2C is a rear view of the rotation position adjusting mechanism 55 as seen from the direction indicated by the arrow IIC in the plane indicated by the two-dot chain line in FIG.

  The rotation position adjusting mechanism 55 mainly includes a guide member 55a, a guided member 55b, and a fixed switching mechanism 55c.

  The guide member 55a is a member that guides the displacement of the guided member 55b, and mainly includes a base plate 55a1, a guide plate 55a2, and a tightening plate 55a3. In this embodiment, the guide member 55a guides the displacement (slide) of the guided member 55b in the Y-axis direction that is the vehicle width direction.

  The base plate 55a1 is a member fixed to the holding plate 51. In this embodiment, the base plate 55a1 extends on a plane parallel to the XY plane, and is fixed to the upper plate 51a1 of the central post 51a of the holding plate 51 using bolts B1 to B4.

  The guide plate 55 a 2 is a plate member that extends parallel to the rotation surface of the upper support arm 53. In the present embodiment, the guide plate 55a2 extends on a plane parallel to the YZ plane, and extends vertically upward with respect to the base plate 55a1. Further, the guide plate 55a2 has two guide holes 55a4 and 55a5 as shown in FIG.

  The tightening plate 55a3 is a plate member that engages with the fixing switching mechanism 55c. In this embodiment, the tightening plate 55a3 extends on a plane parallel to the XZ plane, and extends vertically upward with respect to the guide plate 55a2 and perpendicular to the base plate 55a1.

  The guided member 55b is a member whose displacement is guided by the guide member 55a, and mainly includes a shaft portion 55b1, a connecting portion 55b2, and spacers 55b3 and 55b4.

  The shaft portion 55 b 1 is a member that constitutes a rotation shaft of the upper support arm 53. In the present embodiment, the shaft portion 55 b 1 is connected to the second end 53 b of the upper support arm 53. The shaft portion 55b1 has a flange portion F1 extending in parallel with the + X side surface of the guide plate 55a2.

  The connecting portion 55b2 is a member to which the fixed switching mechanism 55c is connected. In the present embodiment, the connecting portion 55b2 supports the rotation shaft of the fixed switching mechanism 55c. The connecting portion 55b2 has a flange portion F2 extending in parallel to the −X side surface of the guide plate 55a2.

  The spacers 55b3 and 55b4 are members for forming a constant interval between the flange portion F1 of the shaft portion 55b1 and the flange portion F2 of the connecting portion 55b2. In this embodiment, the spacers 55b3 and 55b4 are cylindrical members and are disposed in the guide holes 55a4 and 55a5 formed in the guide plate 55a2. The flange portion F1 and the flange portion F2 are tightened by bolts B5 and B6 in a state of being positioned so as to face each other with the guide plate 55a2 interposed therebetween. At that time, the bolt B5 extends through the spacer 55b3 disposed between the flange portion F1 and the flange portion F2, and the bolt B6 extends through the spacer 55b4 disposed between the flange portion F1 and the flange portion F2. In addition, the thickness (distance in the X-axis direction) of the spacers 55b3 and 55b4 is set to be slightly larger than the thickness of the guide plate 55a2. This is to prevent the guided member 55b from being fixed to the guide member 55a by tightening the bolts B5 and B6.

  The fixing switching mechanism 55c is a mechanism that switches between fixing and releasing the relative position of the guided member 55b with respect to the guide member 55a. In the present embodiment, the fixed switching mechanism 55c mainly includes a shaft portion 55c1, a bolt portion 55c2, and a double nut portion 55c3.

  The shaft portion 55c1 is a member that constitutes a rotating shaft of the bolt portion 55c2. In the present embodiment, the shaft portion 55c1 extends in the Z-axis direction from the head portion of the bolt portion 55c2, and is supported by the connecting portion 55b2 of the guided member 55b. The shaft portion 55c1 extends perpendicular to the base plate 55a1.

  The bolt part 55c2 has threads that engage with the internal threads of the two nuts N1 and N2 constituting the double nut part 55c3. The bolt portion 55c2 is configured to be able to rotate on a rotation surface (XY plane) around an axis formed by the shaft portion 55c1. In this embodiment, an eyebolt is employed as the bolt portion 55c2. Therefore, the bolt part 55c2 can be arranged so as to extend perpendicular to the tightening plate 55a3 as shown in FIG. In that case, as shown in FIG. 2B, the bolt portion 55c2 passes through the tightening plate 55a3 through the notch 55a6 formed in the tightening plate 55a3.

  The double nut portion 55c3 is a member that engages with the bolt portion 55c2. In the present embodiment, the double nut portion 55c3 fixes the relative position of the guided member 55b with respect to the guide member 55a by clamping the tightened plate 55a3 between the nut N1 and the nut N2. Further, the double nut portion 55c3 releases the tightening to release the fixed relative position of the guided member 55b with respect to the guide member 55a.

  Next, with reference to FIG. 3, a description will be given of an operation (hereinafter referred to as “fixing release operation”) in which the operator releases the fixed relative position of the guided member 55 b with respect to the guide member 55 a using the fixing switching mechanism 55 c. To do. FIG. 3 is a top view of the rotation position adjusting mechanism 55 and corresponds to FIG.

  First, the operator loosens the tightening of the tightening plate 55a3 by the two nuts N1 and N2 of the double nut portion 55c3. Specifically, as shown in FIG. 3A, the worker moves the nut N1 in the direction indicated by the arrow AR1, and moves the nut N2 in the direction indicated by the arrow AR2. Thereafter, as shown in FIG. 3B, the operator rotates the bolt portion 55c2 around the shaft portion 55c1 in the direction indicated by the arrow AR3, and moves the bolt portion 55c2 from the notch portion 55a6 of the tightening plate 55a3. Remove.

  As a result, the second end 53b of the upper support arm 53 becomes displaceable along the vehicle width direction indicated by the arrow AR4. In this displaceable state, the operator can adjust the heights of the screw 4 and the holding plate 51 by operating the hydraulic cylinder for height adjustment without removing the upper support arm 53 from the holding plate 51 and the tractor 1. Since the second end 53b of the upper support arm 53 is displaced in the vehicle width direction according to the vertical movement of the screw 4 and the holding plate 51, the presence of the upper support arm 53 does not hinder the vertical movement of the screw 4 and the holding plate 51. Because.

  Next, with reference to FIG. 4, an operation in which the operator adjusts the height of the screw 4 and the holding plate 51 using the height adjusting hydraulic cylinder will be described. FIG. 4 is a rear view of the rotation position adjusting mechanism 55 and corresponds to FIG. Further, the second end 53b of the upper support arm 53 is in a displaceable state, and the first end 53a of the upper support arm 53 is in an undisplaceable state.

  4A shows a state before the screw 4 and the holding plate 51 are moved up and down, and FIG. 4B shows a state when the screw 4 and the holding plate 51 are raised. 4 (C) shows a state when the screw 4 and the holding plate 51 are lowered. Further, the angles α1 to α3 represent angles of the upper support arm 53 with respect to the horizontal plane.

  When the screw 4 and the holding plate 51 are lifted, the guide plate 55a2 is lifted as indicated by an arrow AR5 in FIG. Therefore, the angle of the upper support arm 53 with respect to the horizontal plane decreases from α1 to α2, and the second end 53b of the upper support arm 53 is displaced outward in the vehicle width direction indicated by the arrow AR6. This is because the upward displacement of the guide plate 55a2 is absorbed by the displacement of the second end 53b outward in the vehicle width direction.

  Thereafter, the operator stops the rise of the screw 4 and the holding plate 51 and stops the displacement of the second end 53b, and then performs the guide of the guided member 55b in the reverse procedure to the unlocking operation shown in FIG. An operation of fixing the relative position to the member 55a (hereinafter, “fixing operation”) is executed. Specifically, in the displaceable state shown in FIG. 3B, the operator rotates the bolt portion 55c2 of the fixed switching mechanism 55c around the shaft portion 55c1 to move the notch 55a6 in the tightening plate 55a3. Return the bolt part 55c2. Thereafter, the operator clamps the tightening plate 55a3 between the nuts N1 and N2 of the double nut portion 55c3. As a result, the second end 53b of the upper support arm 53 cannot be displaced along the vehicle width direction.

  Similarly, when the screw 4 and the holding plate 51 are lowered, the guide plate 55a2 is lowered as indicated by an arrow AR7 in FIG. Therefore, the angle of the upper support arm 53 with respect to the horizontal plane increases from α1 to α3, and the second end 53b of the upper support arm 53 is displaced inward in the vehicle width direction indicated by the arrow AR8. This is because the downward displacement of the guide plate 55a2 is absorbed by the displacement of the second end 53b inward in the vehicle width direction.

  Thereafter, the worker stops the lowering of the screw 4 and the holding plate 51 and stops the displacement of the second end 53b, and then performs the fixing work. As a result, the second end 53b of the upper support arm 53 cannot be displaced along the vehicle width direction.

  With the above configuration, the operator simply sets the second end 53 b of the upper support arm 53 in a displaceable state, and does not remove both ends of the upper support arm 53 from the mounting bracket 54 and the rotation position adjusting mechanism 55. 4 and the holding plate 51 can be moved up and down. Further, the operator can complete the height adjustment of the screw 4 and the holding plate 51 only by returning the second end 53b of the upper support arm 53 to the undisplaceable state after moving the screw 4 and the holding plate 51 up and down. Therefore, the operator can easily adjust the screw height for changing the pavement thickness, climbing over a step, and the like.

  Next, another configuration example of the rotational position adjusting mechanism 55 will be described with reference to FIG. FIG. 5 is a rear view of the rotation position adjusting mechanism 55 and corresponds to FIG. Further, in the rotation position adjusting mechanism 55 in FIG. 5, the guide holes 55a4 and 55a5 of the guide plate 55a2 extend in the Z-axis direction, and the second end 53b of the upper support arm 53 and the guided member 55b are both displaced in the Z-axis direction. This is different from the rotation position adjusting mechanism 55 of FIG. In addition, the bolt portion 55c2 of the fixed switching mechanism 55c extends in the Z-axis direction, and the double nut portion 55c3 and the tightening plate 55a3 are disposed in association therewith, and the rotation surface of the bolt portion 55c2 is the base plate 55a1 of the guide member 55a. 2 is different from the rotation position adjusting mechanism 55 in FIG.

  In the present embodiment, when the screw 4 and the holding plate 51 rise, the guide plate 55a2 rises as indicated by an arrow AR9. However, the second end 53b of the upper support arm 53 is not displaced in the vehicle width direction even in a displaceable state. This is because even if the guide plate 55a2 is raised, the spacers 55b3 and 55b4 of the guide plate 55a2 remain in the guide holes 55a4 and 55a5 extending in the Z-axis direction. Further, even if the second end 53b is not displaced in the vehicle width direction according to the vertical movement of the screw 4 and the holding plate 51, the presence of the upper support arm 53 does not hinder the vertical movement of the screw 4 and the holding plate 51. is there.

  Thereafter, the worker performs the fixing work after stopping the ascent of the screw 4 and the holding plate 51. As a result, the second end 53b of the upper support arm 53 cannot be displaced along the vehicle width direction.

  With this configuration, as in the case of the rotation position adjusting mechanism 55 of FIG. The screw 4 and the holding plate 51 can be moved up and down without being removed from the rotation position adjusting mechanism 55. Further, the operator can complete the height adjustment of the screw 4 and the holding plate 51 only by returning the second end 53b of the upper support arm 53 to the undisplaceable state after moving the screw 4 and the holding plate 51 up and down. Therefore, the operator can easily adjust the screw height for changing the pavement thickness, climbing over a step, and the like.

  Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications and substitutions can be made to the above-described embodiments without departing from the scope of the present invention. Can be added.

  For example, in the above-described embodiment, the rotation position adjusting mechanism 55 is used to connect the holding plate 51 directly connected to the screw 4 and the second end 53 b of the upper support arm 53. However, the present invention is not limited to this configuration. For example, the rotation position adjusting mechanism 55 may be used instead of the mounting bracket 54 for connecting the tractor 1 and the first end 53 a of the upper support arm 53. In this case, the second end 53b of the upper support arm 53 may be pin-coupled to the holding plate 51 via a mounting bracket.

  Further, the fixed switching mechanism 55c may be attached to the guided member 55b so as not to rotate. In this case, the operator can displace the second end 53b of the upper support arm 53 only by loosening the double nut portion 55c3 without rotating the bolt portion 55c2 around the shaft portion.

  Further, the fixed switching mechanism 55c may be constituted by a hydraulic cylinder. In this case, the operator opens the valve (not shown) to allow expansion and contraction of the hydraulic cylinder, thereby releasing the fixed relative position of the guided member 55b with respect to the guide member 55a, and closes the valve to prohibit expansion and contraction of the hydraulic cylinder. As a result, the relative position of the guided member 55b with respect to the guide member 55a is fixed.

  Further, the guide plate 55a2 may have one guide hole or may be formed to extend in a direction other than the vertical direction and the horizontal direction.

  DESCRIPTION OF SYMBOLS 1 ... Tractor 1a ... Leveling arm post 2 ... Hopper 2a ... Hopper cylinder 3 ... Screed 3a ... Leveling arm 4 ... Screw 50 ... Screw support structure 51 ... Holding plate 51a ... 51a1 ... Center post 51a1 ... Upper plate 52 ... Front support arm 52a ... First arm 52b ... Second arm 52c ... Third arm 53 ... Upper support arm 53a ... first end 53b ... second end 54 ... mounting bracket 55 ... rotation position adjusting mechanism 55a ... guide member 55a1 ... base plate 55a2 ... guide plate 55a3: Plate to be tightened 55a4, 55a5 ... Guide hole 55a6 ... Notch 55b ... 55b1 ... Shaft part 55b2 ... Connecting part 55b3, 55b4 ... Spacer 55c ... Fixing switching mechanism 55c1 ... Shaft part 55c2 ... Bolt part 55c3 ... Double nut part 100 ...・ Asphalt finisher B1-B6 ... Bolt F1, F2 ... Flange N1, N2 ... Bolt

Claims (5)

A screw support structure that extends beyond the vehicle width of the main body of the road machine and supports the screw that sends out the paving material in the vehicle width direction,
It extends along the screw from the main body portion in the vehicle width direction, and can be displaced in the vertical direction with respect to the main body portion together with the screw. A holding member for rotatably holding,
On the outer side in the vehicle width direction, a first end is rotatably attached to the main body, and a second end is rotatably attached to the holding member;
A rotation position adjustment mechanism that adjusts a relative position on the rotation surface of the first end with respect to the main body portion or a relative position on the rotation surface of the second end with respect to the holding member;
Screw support structure. The rotation position adjusting mechanism with respect to the second end is
A guide member that is fixed to the holding member and guides the displacement of the second end in the vertical direction or the vehicle width direction;
A fixing switching mechanism for switching between fixing and releasing of the second end,
The screw support structure according to claim 1. The fixed switching mechanism is
A bolt portion extending along the guide member from the guided member displaced together with the second end;
A double nut portion that engages with the bolt portion and tightens a member to be tightened extending from the guide member,
The screw support structure according to claim 2. The bolt portion is rotatably attached to the guided member and is removable from the tightened member.
The screw support structure according to claim 3.   A road machine on which the screw support structure according to any one of claims 1 to 4 is mounted.

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