JP5293041B2 - Work attachment and construction machine equipped with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a work attachment facilitating adjustment of a detection point while extending the life, and a construction machine provided with the same. <P>SOLUTION: The work attachment includes: a rotary member 25 mounted on a first link 12 to be rotatable around a connecting shaft J3; a bolt B1 capable of restraining rotation of the rotary member 25 relative to the first link; a detected member 22 fitted to the first link 12 in a state of being rotatable together with the first link 12 by being held by the rotary member 25 whose rotation is restrained by the bolt B1, and having predetermined detection points P3, P4; and a magnetic sensor 21 mounted on an arm 7 so that it may rise with the arm 7 and capable of detecting the detection points P3, P4. The operation for restraining the rotation of the rotary member 25 by the bolt B1 and the operation for allowing the rotation can be conducted from an outside position opposite to the arm 7 across a flange part 12b. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to an angle detection device provided in a work attachment of a construction machine such as a hydraulic excavator.

  For example, as shown in FIG. 9, the arm 101, the bucket 102 provided at the tip of the arm 101, the link 103 connected to the arm 101 so as to be rotatable around the connecting pin 110, the link 103 and the bucket 2. Description of the Related Art A hydraulic excavator provided with a work attachment that includes a link 104 that couples the link 102 and a cylinder 105 that swings the bucket 102 relative to the arm 101 by swinging the links 103 and 104 is known.

  In this type of construction machine, the swing angle of the bucket 102 relative to the arm 101 is detected in order to avoid interference (contact) between the bucket 102 and the cab of the construction machine during operation of the work attachment. Specifically, the work attachment is provided with an angle detection device 106 that detects the angle of the link 103 in order to specify the swing angle of the bucket 102 with respect to the arm 101. As this angle detection device 106, for example, a device using an angle sensor that detects the relative angle of the link 103 with respect to the arm 101 (for example, Patent Document 1) is known.

  On the other hand, instead of detecting the relative angles of the links 103 one by one as in Patent Document 1, there is also one that uses as the angle detection device 106 that detects whether or not the relative angle is equal to or greater than a predetermined angle. For example, when control is performed to limit the tilt angle of the arm 101 when the swing angle of the bucket 102 with respect to the arm 101 is equal to or greater than a predetermined value, the angle of the link 103 need not be detected one by one. It is sufficient to detect whether the angle of the link 103 is equal to or greater than a predetermined angle. In such a case, if a sensor (hereinafter referred to as a switching sensor) whose detection state is switched depending on whether or not the angle of the link 103 is a predetermined angle is used, compared to the case where the angle sensor is used. Cost advantage.

  10 is a cross-sectional view taken along the line XX of FIG. 9 when a switching sensor is used. 11 is a cross-sectional view taken along line XI-XI in FIG.

  A switching sensor 111 shown in each figure detects a detection ring 107 formed in a circular ring shape and detection whether or not the detection points P1 and P2 (see FIG. 11) set in the detection ring are exceeded. Member 108. The detected ring 107 has a metal portion 107a that constitutes a predetermined range in the circumferential direction and a nonmetal portion 107b that constitutes another range, and the boundaries between these portions 107a and 107b are set as detection points P1 and P2. Has been. The detection member 108 includes a magnetic sensor or the like.

The detected ring 107 is fixed to the inner side surface of the flange portion 103 a formed on the outer side of the link 103 by a bolt 109 with the connecting pin 110 passed therethrough. The detection member 108 is fixed to the arm 101 so as to face the outer peripheral surface of the detection ring 107.
Japanese Utility Model Publication No. 3-39104

  By the way, there is a case where not only the bucket 102 but also a working machine such as a crusher is attached to the tip of the arm 101. Even if the stroke of the cylinder 105 is constant, the working machine depends on the type of the working machine. The rocking range (angle) of is different. In other words, the swing range of the work implement changes according to the difference in the distance between the swing support point of the arm 101 and the work implement and the swing support point of the link 104 and the work implement. For this reason, in order to avoid interference between the work implement and the cab, it is necessary to adjust the positions of the detection points P1 and P2 for each work implement.

  However, the conventional switching sensor shown in FIGS. 10 and 11 has a problem that it is difficult to perform an operation for changing the positions of the detection points P1 and P2. The reason is as follows.

  That is, in order to adjust the angle of the detected ring 107, it is necessary to remove the bolt 109 and screw it into another screw hole. However, the detected ring 107 is connected to the flange portion 103a of the link 103 from the inside by the bolt 109. Since it is fixed, it is necessary to remove the link 103 itself from the arm 101 in order to remove the bolt 109, and the work is large.

  Here, it is conceivable to fix the detected ring 107 outside the flange portion 103a of the link 103. However, when the detected ring 107 is disposed outside the flange portion 103a, the earth and sand scattered from the outside directly collide. This increases the possibility of damaging the ring 107 to be detected.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a work attachment capable of easily adjusting a detection point and a construction machine including the work attachment while achieving a long life. .

  In order to solve the above-described problems, the present invention provides a working attachment having a hoisting member that can be raised and lowered with respect to a machine body of a construction machine, wherein the swinging attachment is swingably attached to a tip portion of the hoisting member. A member, a power source that outputs power for swinging the swing member, and the undulating member so as to convert the power from the power source into the swing direction of the swing member relative to the undulating member. A link rotatably provided around the connecting shaft, a flange provided on the link and projecting in a direction perpendicular to the connecting shaft at a position away from the undulating member in the axial direction of the connecting shaft, A rotation member provided to be rotatable about a connecting shaft with respect to the link, a restriction member capable of restricting the rotation of the rotation member with respect to the link, and a rotation whose rotation is restricted by the restriction member Held by the member It is attached to the link so as to be rotatable together with the link, and a detected member having a predetermined detection point is provided on the hoisting member so as to be able to hoist together with the hoisting member, and the detection point can be detected. A detecting member, and the rotating member is configured to hold the detected member so as to be positioned inside the flange portion and the undulating member regardless of a rotating position with respect to the link, and the restriction An operation for restricting the rotation of the rotation member by the member and an operation for allowing the rotation can be performed from an outer position on the opposite side of the undulation member across the flange portion. A work attachment characterized by the above is provided.

  According to the present invention, the member to be detected is held between the flange portion and the undulating member by the rotating member regardless of the rotation position of the rotating member. Direct collision can be suppressed. Furthermore, according to the present invention, since the member to be detected is held by the rotating member that can rotate around the connecting shaft, the object to be detected in a state where the restriction by the restricting member is released (a state in which the rotation is permitted). The angle of the detection point of the detection member can be adjusted. And since the operation of the restriction and the rotation allowance by such a restriction member can be operated from the outside of the flange portion, the trouble of removing the link from the undulating member as in the past can be omitted, and the detection The angle of the point can be easily adjusted.

  Therefore, according to the present invention, it is possible to easily adjust the detection point while extending the life.

  In the work attachment of the construction machine, it is preferable that the restricting member is configured to be capable of adjusting an angle of the rotating member with respect to the link for each predetermined angle around the connecting shaft.

  If it does in this way, it will become possible to adjust a detection point intermittently for every said predetermined angle.

  In the work attachment of the construction machine, the link is formed with a through-hole penetrating the flange portion in a direction parallel to the connecting shaft, the regulating member is a bolt, and the rotating member is It is preferable that a female screw portion capable of screwing the bolt inserted into the through hole from the outside of the flange portion is formed.

  In this way, by loosening the bolt from the outside of the flange, it becomes possible to adjust the angle around the connecting shaft of the rotating member, while by tightening the bolt from the outside of the flange portion, the rotating member Can be fixed to the link at a predetermined angle.

  Moreover, this invention provides the construction machine provided with the said work attachment and the body with which the said work attachment was provided so that raising / lowering was possible.

  According to the present invention, detection points can be easily adjusted while extending the life.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a side view showing the overall configuration of a demolition machine according to an embodiment of the present invention.

  Referring to FIG. 1, a demolition machine 1 as an example of a construction machine includes a self-propelled lower traveling body 2 having a crawler 2a, and an upper revolving body 3 that is turnably mounted on the lower traveling body 2. The work attachment 4 is provided so as to be undulated with respect to the upper swing body 3. Hereinafter, description will be made using front and rear, left and right directions viewed from the occupant of the cab 5 provided in the upper swing body 3.

  The work attachment 4 includes a boom 6 that can be raised and lowered with respect to the upper swing body 3, an arm (raising and lowering member) 7 that is swingably attached to the tip of the boom 6, and the arm 7. A crusher (oscillating member) 8 is provided at the tip so as to be able to swing. The work attachment 4 includes a boom cylinder 9 provided between the boom 6 and the upper swing body 3, an arm cylinder 10 provided between the boom 6 and the arm 7, and one end of the arm 10. The supported crusher cylinder (power source) 11, the first link 12 provided between the tip of the crusher cylinder 11 and the tip of the arm 7, the tip of the crusher cylinder 11 and crushing A second link 14 provided between the machine 8 and an angle detection device 20 (see FIG. 3) for detecting a relative angle between the first link 12 and the arm 7 is provided.

  The boom 6 undulates with respect to the upper swing body 3 according to the expansion and contraction operation of the boom cylinder 9. The arm 7 swings with respect to the boom 6 according to the expansion / contraction operation of the arm cylinder 10.

  FIG. 2 is an enlarged side view showing the tip of the arm 7 of FIG.

  1 and 2, the crusher cylinder 11 includes a cylinder body 15 and a rod 16 that expands and contracts with respect to the cylinder body 15. The base end portion of the cylinder body 15 is supported so as to be rotatable about a left and right axis J1 (see FIG. 1) with respect to the arm 7. On the other hand, the proximal end portion of the first link 12 is attached to the distal end portion of the rod 16 so as to be rotatable about the axis J2 in the left-right direction. And the front-end | tip part of the 1st link 12 is attached with respect to the front-end | tip side surface of the arm 7 so that rotation around the connection axis J3 of the left-right direction is possible. Therefore, the linear motion of the rod 16 of the arm cylinder 10 is converted into the rotational motion around the connecting axis J3, that is, the swing motion of the crusher 8. Then, the rotational driving force is transmitted to the crusher 8 by the second link 14 attached to the tip of the rod 16 so as to be rotatable about the axis J2.

  3 is a cross-sectional view taken along line III-III in FIG. FIG. 4 is an enlarged left side view of the distal end portion of the first link 12.

  2 to 4, the first link 12 is a plate-like metal member extending from the axis J2 to the connecting axis J3. A cylindrical boss 12a (see FIGS. 3 and 4) protrudes to the right at the tip of the first link 12 corresponding to the insertion position of the connecting shaft J3. In other words, the flange portion 12b that bulges in the direction orthogonal to the connecting shaft J3 is formed around the boss 12a when viewed from the boss 12a. The flange portion 12b is provided with twelve female screw portions (through holes) 12c to 12n on a circumference centered on the connecting shaft J3. In each of the female screw portions 12c to 12n, three female screw portions arranged at intervals of 24 ° with the connecting shaft J3 as the center are arranged at four positions every 90 °.

  As will be described in detail later, among the female screw portions 12c to 12n, the female screw portions 12e, 12h, 12k, and 12m (shown by painting) are bolts (regulating members) that penetrate the flange portion 12b as shown in FIG. While B1 is screwed, a bolt B2 for plugging the female screw portion is screwed to the other female screw portion.

  Next, the angle detection device 20 will be described. 5 is a cross-sectional view taken along line VV in FIG. 6 is a right side view of the member 22 to be detected in FIG. FIG. 7 is a right side view of the rotating member 25 of FIG. FIG. 8 is a left side view of the rotating member 25 of FIG.

  3 and 5, the angle detection device 20 holds the magnetic sensor 21 attached to the arm 7, the detected member 22 that is the detection target of the magnetic sensor 21, and the detected member 22. And an attachment member 23 attached to the first link 12.

  The detected member 22 is a cylindrical member as shown in FIGS. 5 and 6. A range E1 of the detected member 22 that is a part in the circumferential direction is made of a resin such as rubber, and a range E2 other than the range E1 is made of metal. The boundary portion between the range E1 and the range E2 constitutes detection points P3 and P4 of the member 22 to be detected. Further, seven through holes 24 penetrating in the axial direction are formed in the detected member 22 in the circumferential direction.

  The attachment member 23 is for attaching the detected member 22 to the first link 12, as shown in FIGS. Specifically, the attachment member 23 holds the detected member 22 and is attached to the first link 12 so as to be rotatable about the connection axis J <b> 3, and the first link of the rotation member 25. 12 is provided with a bolt (restricting member) B1 for restricting the rotation with respect to 12, and a bolt B3 for attaching the detected member 22 to the rotating member 25.

  The rotating member 25 is a donut-shaped metal plate having the same outer diameter and inner diameter as the detected member 22 and having an outer diameter smaller than that of the flange portion 12b. As shown in FIGS. 3 and 7, seven female screw portions 26 opening in the right direction are formed on the right side surface of the rotating member 25 in the circumferential direction corresponding to the through holes 24. Therefore, as shown in FIG. 3, the bolt B <b> 3 inserted from the right into the through hole 24 of the detected member 22 with the mounting member 23 and the detected member 22 overlapped to the left and right is the female thread portion of the rotating member 25. The attachment member 23 and the member 22 to be detected can be integrated with each other by being screwed onto the member 26. The mounting member 23 and the detected member 22 that are integrated in this way are fitted on the outside of the boss 12a of the first link 12 in a rotatable state. Specifically, a disc-shaped rib 28 is formed on the outer peripheral surface of the boss 12 a, and the inner surface of the rotating member 25 is slidably supported on the outer peripheral surface of the rib 28. Since the rib 28 is formed concentrically with the boss 12b and the connecting shaft J3, the rotating member 25 that rotates along the outer periphery of the rib 28 rotates around the connecting shaft J3. Therefore, the detected member 22 held so as to overlap the rotating member 25 is positioned between the flange 12 b and the arm 7 regardless of the rotating position of the rotating member 25.

  On the other hand, as shown in FIGS. 3 and 8, female screw portions 27 that open in the left direction are formed on the left side surface of the rotating member 25 at intervals of 6 ° in the circumferential direction. These female threaded portions 27 are formed at different positions in the circumferential direction from the respective female threaded portions 26 formed on the right side surface. As shown in FIG. 3, the front end of the bolt B1 screwed into the female threaded portions 12e, 12h, 12k and 12m of the flange portion 12b from the left side is screwed into the female threaded portion 27 of the mounting member 23, thereby A rotating member 25 can be attached to one link 12. Thereby, the rotation of the rotation member 25 with respect to the first link 12 is also restricted.

  Hereinafter, a procedure for adjusting the positions of the detection points P3 and P4 of the detected member 22 will be described with reference to FIG. First, the four bolts B <b> 1 are loosened from the left side of the first link 12 and extracted from the female screw portion 27. As a result, the rotation member 25 is released from the restriction on the first link 12 (flange portion 12b) and can be rotated about the connecting shaft J3 (boss 12a). Even in this state, the rotation member 25 and the member 22 to be detected are integrated by the bolt B3, so that the angle of the detection points P3 and P4 can be changed by rotating the rotation member 25. Specifically, in the present embodiment, since the female screw portions 27 are formed on the left side surface of the rotating member 25 at intervals of 6 °, the female screw portions 27 and the female screw portions 12e, 12h, 12k, and 12m of the flange portion 12b. By tightening the bolt B1 in a state where the two are stacked, the detection points P3 and P4 can be adjusted in increments of 6 °.

  As described above, according to the embodiment, the detection member 22 is held between the flange portion 12b and the arm 7 by the rotation member 25 regardless of the rotation position of the rotation member. It is possible to suppress earth and sand from directly colliding with the detected portion 22 by the flange portion 12b. Furthermore, according to the embodiment, since the member 22 to be detected is held by the rotating member 25 that can rotate around the connecting axis J3 with respect to the link, the restriction by the bolt B1 is released (rotation). The angle of the detection points P3 and P4 of the detected member 22 can be adjusted. And since the operation of the restriction | limiting by this bolt B1 and the permission of rotation can be operated from the outer side of the flange part 12b, the angle adjustment of the detection points P3 and P4 can be performed easily.

  Therefore, according to the embodiment, the detection points P3 and P4 can be easily adjusted while extending the life.

  As in the above-described embodiment, the angle of the rotation member 25 with respect to the first link 12 at every predetermined angle (6 °) around the connecting shaft J3 corresponding to the formation position of each female thread portion 27 of the rotation member 25. It is possible to adjust the detection points P3 and P4 intermittently for each predetermined angle.

  As in the above-described embodiment, the first link 12 is formed with female screw portions 12c to 12n that penetrate the flange portion 12b in a direction parallel to the connecting shaft J3, and the rotating member 25 has the flange portion 12b. If the female screw part 27 that can be screwed with the bolt B1 inserted into the female screw parts 12c to 12n from the opposite side of the member 22 to be detected is formed on the left side (outside) of the flange part 12b By loosening B1, the angle around the connecting axis J3 of the rotating member 25 can be adjusted. On the other hand, by tightening the bolt B1 from the outside of the flange portion, the rotating member 25 is moved at a predetermined angle. It can be fixed to one link 12.

  In the above-described embodiment, the configuration for detecting the detection points P3 and P4 of the detected member 22 by the magnetic sensor 21 has been described. However, even when other sensors are used, the detection points are provided on the first link 12. If it is the structure fixed, the effect similar to the above can be acquired by the attachment member 23. FIG. For example, in the configuration in which the limit switch is fixed to the arm 7 and the detector for operating the limit switch is fixed to the first link 12 when the first link 12 and the arm 7 are at a predetermined angle. If the detector is held by the mounting member 23, the angle of the detector can be easily adjusted. Further, in the configuration in which the light source is fixed to the arm 7 and the light shielding plate that blocks the light emitted from the light source when the first link 12 and the arm 7 are at a predetermined angle is fixed to the first link 12, If the light shielding plate is held by the mounting member 23, the angle of the light shielding plate can be easily adjusted.

  In the above embodiment, the rotation of the rotating member 25 relative to the first link 12 is restricted by the bolt B1 inserted from the left into the through holes 12e, 12h, 12k, 12n. The rotation of the rotating member 25 can also be restricted by forming a female screw portion penetrating in the vertical direction or the front-rear direction in 25 and screwing a set screw into the female screw portion. That is, the rotation of the rotation member 25 relative to the first link 12 can be restricted by bringing the tip of the set screw into contact with the side surface of the boss 12 a of the first link 12. And even if it is this structure, the tightening operation of a set screw and the loosening operation of a set screw can be performed from the outer side (left side) of the flange part 12b.

It is a side view which shows the whole structure of the demolition machine which concerns on embodiment of this invention. It is a side view which expands and shows the front-end | tip part of the arm of FIG. It is the III-III sectional view taken on the line of FIG. It is a left view which expands and shows the front-end | tip part of a 1st link. It is the VV sectional view taken on the line of FIG. It is a right view of the to-be-detected member of FIG. It is a right view of the rotation member of FIG. It is a left view of the rotation member of FIG. It is a side view for demonstrating the conventional work attachment. FIG. 10 is a cross-sectional view taken along the line X-X in FIG. It is the XI-XI sectional view taken on the line of FIG.

Explanation of symbols

B1 to B3 Bolt J3 Connecting shaft P1 to P4 Detection point 1 Demolition machine (construction machine)
4 Work attachment 7 Arm (raising / lowering member)
8 Crusher (rocking member)
10 Detected ring 11 Crusher cylinder (power source)
12 First link 12b Flange portion 20 Angle detection device 21 Magnetic sensor 22 Detected member 23 Mounting member 25 Rotating member 26, 27 Female thread portion

Claims (4)

A work attachment having a hoisting member capable of hoisting against the body of a construction machine,
A swinging member attached to the tip of the hoisting member so as to be swingable;
A power source that outputs power for swinging the swing member;
A link provided so as to be rotatable about a connecting shaft with respect to the hoisting member so as to convert the power of the power source into the rocking direction of the rocking member with respect to the hoisting member;
A flange portion provided on the link and extending in a direction perpendicular to the connecting shaft at a position away from the undulating member in the axial direction of the connecting shaft;
A rotating member provided so as to be rotatable around a connecting shaft with respect to the link;
A regulating member capable of regulating the rotation of the rotating member with respect to the link;
A member to be detected having a predetermined detection point attached to the link in a state of being rotatable together with the link by being held by the rotation member whose rotation is restricted by the restriction member;
A detection member provided on the hoisting member so as to be able to hoist together with the hoisting member and capable of detecting the detection point;
The rotating member is configured to hold the detected member so as to be positioned inside the flange portion and the undulating member regardless of a rotating position with respect to the link,
An operation for restricting the rotation of the rotating member by the restricting member and an operation for allowing the rotation can be performed from an outer position on the opposite side of the undulating member across the flange portion. A work attachment characterized by   The work attachment according to claim 1, wherein the restricting member is configured to be capable of adjusting an angle of the rotating member with respect to the link for each predetermined angle around the connecting shaft.   The link is formed with a through-hole penetrating the flange portion in a direction parallel to the connecting shaft, the regulating member is a bolt, and the rotating member is penetrated from the outside of the flange portion. The work attachment according to claim 1, wherein an internal thread portion capable of screwing the bolt inserted into the hole is formed. The work attachment according to any one of claims 1 to 3,
A construction machine comprising: a machine body provided with the work attachment so as to be undulated.

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