Support device for front components of construction machinery

Abstract

The present invention provides a support device for a front member of construction machinery that does not require processing of the front member and improves the efficiency of the front member placement work. [Solution] A support device (20) for placing and supporting the front member (16) when the front device (8) of a construction machine (1), which is formed by inserting a connecting pin (32) into a connecting pin hole (30) formed in the front member (16), is provided. The support device (20) comprises a frame (22) for supporting the front member (16), a first fixing pin (24) inserted into the connecting pin hole (30), and a pair of pin receiving bases (26) that support both ends of the first fixing pin (24) in the axial direction (X) from below and are detachably provided on a pair of upper ends (22a) of the frame (22).

Description

Technical Field

[0001] The present invention relates to a support device for a front member of a construction machine. More specifically, in a construction machine that inserts a connection pin into a connection pin hole formed in a front member constituting a front device to rotatably support the front member, the present invention relates to a support device that places and supports the front member when the front device is disassembled.

Background Art

[0002] When assembling, disassembling, transporting, etc. a front member such as an arm that constitutes a front device of a construction machine, it may be placed and supported on the ground or on the loading platform of a vehicle. Patent Document 1 discloses a support device for a front member for a work attachment used in such a case. In Patent Document 1, a pair of substantially semi-circular brackets project from the front member, and the support device includes a gantry that supports the front member and a pair of receiving portions integrally formed on the gantry.

[0003] A fixing pin is inserted through a long hole formed in each receiving portion via a pin guide fixed to each bracket. As a result, the arc-shaped lower surface (contact surface) of each bracket contacts the support surface formed between the receiving portions. The front member is placed in a state where it can rotate in the vertical direction with this contact point as a fulcrum and the contact surface can move back and forth with respect to the support surface.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] It is not possible to form protrusions such as brackets on the underside of the front members that may come into contact with the ground. Furthermore, long front members generally have thin side walls to reduce weight, so it is not possible to form protrusions such as brackets due to strength issues. Thus, since the form of protrusions on the front members is subject to various constraints, it is conceivable to insert fixing pins as described above into the existing connecting pin holes used to connect the front members to each other and support the front members at each receiving part of the frame.

[0006] However, in this case, it is first necessary to align the position of the connecting pin holes in the front member with the position of the elongated holes formed in each receiving part, and then to insert the aforementioned pin guide through these aligned parts, and then to insert the fixing pin. Consequently, there is a risk that the receiving part may interfere, making it impossible to insert or remove the pin guide or fixing pin, and thus making it difficult to place the front member.

[0007] This invention has been made in view of the above problems, and aims to provide a support device for a front member of construction machinery that does not require processing of the front member and can improve the efficiency of the front member mounting work. [Means for solving the problem]

[0008] To achieve the above objective, the present invention provides a support device for a construction machine front member, which supports the front member when the front assembly of a construction machine, which is formed by inserting a connecting pin into a connecting pin hole formed in the front member, is disassembled. The support device comprises a frame for supporting the front member, a first fixing pin inserted into the connecting pin hole, and a pair of pin receiving bases that support both ends of the first fixing pin in the axial direction from below and are detachably provided on a pair of upper ends of the frame. [Effects of the Invention]

[0009] The support device for the front member of construction machinery of the present invention eliminates the need for processing the front member and improves the efficiency of the front member placement work. [Brief explanation of the drawing]

[0010] [Figure 1] This is a side view of a hydraulic excavator, which is an example of a construction machine according to an embodiment of the present invention. [Figure 2] This is a perspective view of a support device according to an embodiment of the present invention. [Figure 3] This is a perspective view showing a portion of the front unit mounted on the support structure's frame. [Figure 4] This is a perspective view of the front member mounted on the support device. [Figure 5] This is a perspective view of the mounting mechanism. [Figure 6] This is a front view of the mounting mechanism as seen from direction A in Figure 5. [Figure 7] This is an enlarged view of the side of the mounting mechanism as seen from direction B in Figure 6. [Figure 8] This is a perspective view of the pin holder. [Figure 9] This is a top view of the pin holder. [Figure 10] Figure 9 is a side view of the pin holder when the pin retainer is rotated. [Figure 11] This is a step-by-step side view showing the pin retainer being rotated relative to the pin holder. [Figure 12] This is a perspective view of the support device with a long front member installed. [Modes for carrying out the invention]

[0011] Hereinafter, a support device for a front member of a construction machine according to an embodiment of the present invention will be described with reference to the drawings. Figure 1 shows a side view of a hydraulic excavator 1, which is an example of a construction machine. Hereafter, the "front-rear direction" and "up-down direction" shown in the figures refer to directions relative to the body of the hydraulic excavator 1, and the "left-right direction" refers to directions relative to an operator who is riding on the hydraulic excavator 1 and facing forward. The hydraulic excavator 1 comprises a self-propelled crawler-type lower traveling body 2, an upper rotating body 6 that is rotatably mounted on the lower traveling body 2 via a slewing device 4, and a front device 8 that is provided on the front side of the upper rotating body 6 so as to be able to be tilted up and down and is used for excavation work, etc.

[0012] The upper slewing body 6 is equipped with a slewing frame 10 that constitutes its support structure. A cab 12 in which the operator sits is located on the left front side of the slewing frame 10, and a counterweight 14 for balancing the weight with the front device 8 is located on the rear side of the slewing frame 10. The front device 8 consists of a boom 16a supported by the upper slewing body 6, an arm 16b pivotably supported at the tip of the boom 16a, and a bucket 16c pivotably supported at the tip of the arm 16b (hereinafter collectively referred to as the front member 16). These boom 16a, arm 16b, and bucket 16c are driven by hydraulic cylinders 16d, 16e, and 16f, respectively.

[0013] Figure 2 shows a perspective view of a support device 20 according to an embodiment of the present invention. The support device 20 supports the front member 16 when the front device 8 is disassembled. The support device 20 comprises a frame 22, a first fixing pin 24, a pair of pin receiving bases 26, and a pair of mounting mechanisms 28. The frame 22 is formed by combining columns and beams formed from multiple frames and supports the front member 16. The first fixing pin 24 is inserted into a connecting pin hole 30 of the front member 16, which will be described later. The pair of pin receiving bases 26 support both ends of the first fixing pin 24 in the axial direction from below. The mounting mechanism 28 detachably attaches the pin receiving bases 26 to a pair of upper end portions 22a of the frame 22.

[0014] Figure 3 shows a perspective view when a part of the front device 8 is placed on the pedestal 22 of the support device 20. In Figure 3, with the mounting mechanism 28 operated, the arm 16b of the front device 8 from which the bucket 16c has been removed is leaned against the cross beam 22b of the pedestal 22 in a state where each pin receiving base 26 has been removed from the upper end portion 22a of the pedestal 22. Here, in the hydraulic excavator 1, by inserting the connection pin 32 into the connection pin hole 30 formed in the front member 16 constituting the front device 8, each front member 16 is supported rotatably. In the case shown in Figure 3, consistent connection pin holes 30 are formed in the arm 16b and the boom 16a, and by inserting the connection pin 32 into the connection pin hole 30, the arm 16b is supported rotatably with respect to the boom 16a.

[0015] Figure 4 shows a perspective view when the front member 16 is installed on the support device 20. The procedure from the state of Figure 3 to the state of Figure 4 is as follows: with the arm 16b leaned against the cross beam 22b of the pedestal 22, first, the connection pin 32 is removed from the connection pin hole 30 and the boom 16a is removed. Next, by operating the mounting mechanism 28, the pin receiving bases 26 are respectively attached to the upper end portions 22a of the pedestal 22.

[0016] Next, the first fixing pin 24 is inserted into the connection pin hole 30 of the arm 16b, and both ends in the axial direction of the first fixing pin 24 are respectively supported by the respective pin receiving bases 26. Thereby, the arm 16b is installed and fixed to the support device 20. Thus, by making each pin receiving base 26 detachable, the insertion of the first fixing pin 24 into the connection pin hole 30 and the support of the first fixing pin 24 by each pin receiving base 26 can be performed smoothly.

[0017] FIG. 5 shows a perspective view of the mounting mechanism 28. FIG. 5 shows a state in which one of the pair of side walls 50a constituting the base body 50 of the pin receiver 26 is removed. The mounting mechanism 28 has a first pin hole 40, a mounting portion 42, a second pin hole 44, and a second fixing pin 46. The first pin hole 40 is drilled in the upper end portion 22a of the gantry 22. The upper end portion 22a of the present embodiment is formed in the upper portion of the column having a U-shaped cross section, and the first pin holes 40 are formed in the respective side walls 22c of the opposed upper end portions 22a in the U-shaped cross section.

[0018] The mounting portion 42 is formed between the respective side walls 50a constituting the base body 50 of the pin receiver 26, and includes an upper wall 42a and a pair of first side walls 42b extending downward from both ends of the upper wall 42a. The second pin holes 44 are respectively drilled in the respective first side walls 42b and are continuously formed inside the cylindrical portions 42c projecting outward from the respective first side walls 42b. The second fixing pin 46 is inserted through the respective first pin holes 40 and the respective second pin holes 44 in a consistent manner.

[0019] FIG. 6 shows a front view of the mounting mechanism 28 as viewed from the A direction in FIG. 5, and FIG. � shows an enlarged side view of the mounting mechanism 28 as viewed from the B direction in FIG. 6. As shown in FIG. 6, in a state where the pin receiver 26 is attached to the upper end portion 22a of the gantry 22, the upper end portion 22a of the gantry 22 abuts on the upper wall 42a of the mounting portion 42 of the pin receiver 26. That is, no gap is generated between the upper end portion 22a and the upper wall 42a.

[0020] Then, as shown in FIG. 7, the second fixing pin 46 has a diameter d that can be inserted and removed with respect to the first pin hole 40 and the second pin hole 44 in a state where the upper end portion 22a abuts on the upper wall 42a. In other words, in a state where the upper end portion 22a abuts on the upper wall 42a, the second fixing pin 46 has a diameter d that can form a gap G1 between the first pin hole 40 and a gap G2 between the second pin hole 44, and is inserted into the first and second pin holes 40, 44. Thereby, in a state where the pin receiver 26 is attached to the upper end portion 22a of the gantry 22, and thus the front member 16 is placed on the support device 20, the load of the front member 16 is transmitted from the upper end portion 22a to the gantry 22, and no load is applied to the second fixing pin 46.

[0021] Figure 8 shows a perspective view of the pin receiving base 26. Note that the first fixing pin 24, the pin retainer 56 (described later), and the third fixing pin 58 are not shown in Figure 8. The pin receiving base 26 has a base body 50 composed of the pair of side walls 50a described above, as well as a receiving portion 52 and a pair of third pin holes 54. In this embodiment, each side wall 50a of the base body 50 has a recess 50b that curves downwards, and a receiving portion 52 for receiving the first fixing pin 24 is connected to each recess 50b.

[0022] The receiving portion 52 includes a lower curved wall 52a that curves downward convexly along the lower part of the radial direction of the first fixing pin 24 (hereinafter, "radial direction" means the radial direction of the first fixing pin 24), and a pair of second side walls 52b that extend upward from both ends of the lower curved wall 52a. Each second side wall 52b has a receiving groove 52c formed therein to receive the pin retainer 56, which will be described later. The third pin holes 54 are drilled on both the radial outer sides of each side wall 50a of the base body 50. Each third pin hole 54 formed on one side of each side wall 50a is formed continuously inside a cylindrical portion 50c that protrudes outward from the side wall 50a.

[0023] Figure 9 shows a top view of the pin holder 26. The pin holder 26 has a pin retainer 56, which has a cover portion 56a that covers the radial upper part of the first fixing pin 24, and a pair of fourth pin holes 60 drilled on both radial sides of the cover portion 56a. The pin retainer 56 is fitted into each receiving groove 52c formed in the receiving portion 52, and the third fixing pin 58 is consistently inserted through the third pin holes 54 and the fourth pin holes 60 located on the same radial outer side of the receiving portion 52. This fixes the pin retainer 56 to the pin holder 26 and prevents the first fixing pin 24 from falling out from above the pin holder 26.

[0024] Each third fixing pin 58 is prevented from falling out by a retaining ring 62 that is attached via each cylindrical portion 50c formed on the base body 50. The first fixing pin 24 is positioned to protrude outward in the axial direction X from the cover portion 56a of the pin retainer 56. A pin fall prevention plate 64 is integrally formed on the pin retainer 56 via two columnar connecting portions 56b, facing the end face 24a of the protruding first fixing pin 24 with a gap G3 between them. By ensuring a gap G3, contact between the pin fall prevention plate 64 and the first fixing pin 24 is prevented when the pin retainer 56 rotates, allowing the pin retainer 56 to rotate smoothly.

[0025] The pin fall prevention plate 64 is positioned to cover the end face 24a of the first fixing pin 24, thereby preventing the first fixing pin 24 from falling out of the pin receiving base 26 in the axial direction X. Furthermore, the pin fall prevention plate 64 is formed within a range that fits within the receiving portion 52 in the axial direction X. In other words, the pin fall prevention plate 64 and the end face 52d of the second side wall 52b of the receiving portion 52, which is located outside of the axial direction X, are separated by a distance D in the axial direction X. By ensuring this distance D, the pin fall prevention plate 64 does not protrude from the receiving portion 52 in the axial direction X when the pin retainer 56 rotates, thus enabling smooth rotation of the pin retainer 56.

[0026] Figure 10 shows a side view of the pin holder 26 when the pin retainer 56 is rotated in Figure 9. As shown in Figure 10, the pin retainer 56 can be rotated around the third fixing pin 58 on the right side (the other side) by removing the third fixing pin 58 on the left side (one side). Here, as mentioned above, the pin fall prevention plate 64 is formed within a range that fits into the receiving portion 52 in the axial direction X. Therefore, there is a concern that the pin fall prevention plate 64 may come into contact with the receiving portion 52 when the pin retainer 56 is rotated around the third fixing pin 58 on the right side. However, the pin fall prevention plate 64 has constricted portions 64a on both sides that are cut out to avoid such contact. This makes it possible to rotate the pin retainer 56 while avoiding interference with the pin fall prevention plate 64.

[0027] Figure 11 shows a stepwise side view of the pin retainer 56 when it is rotated relative to the pin base 26. Note that Figure 11 shows a part of the pin base 26 and the pin retainer 56 as seen from the CC direction in Figure 9, and the first fixing pin 24 is not shown. The dashed line in Figure 11 shows the movement trajectory when the pin retainer 56 is rotated about the axis C3 of the third fixing pin 58, where C1 is the center of gravity of the pin retainer 56, and the line L is the vertical line connecting the hole center C2 of the fourth pin hole 60 and the axis C3 of the third fixing pin 58 when the fourth pin hole 60 through which the left third fixing pin 58 was inserted is positioned directly above the right third fixing pin 58.

[0028] In this case, the pin retainer 56 is formed such that the angle α of its center of gravity C1 with respect to the line L directly above, starting from the axis C3 of the right-side third fixing pin 58 which serves as its pivot point, is greater than 0 degrees. As a result, when the pin retainer 56 is pushed by hand around the axis C3 of the right-side third fixing pin 58 and rotated to a position where the line L directly above is formed, the pin retainer 56 will then rotate automatically due to its own weight even if the hand is released. Therefore, the rotation of the pin retainer 56 can be made smooth.

[0029] Furthermore, the base body 50 of the pin receiving base 26 has stoppers 66 formed therein to restrict the rotation of the pin retainer 56. As shown in Figure 9, the stoppers 66 are plate-shaped portions that extend horizontally directly below each third pin hole 54. As mentioned above, after the pin retainer 56 rotates automatically due to its own weight, its rotation is stopped at the stopper 66 in a horizontal position and supported by the base body 50, as shown by the solid line in Figure 11.

[0030] Figure 12 shows a perspective view of the support device 20 with a long front member 16 installed. Even when a front member 16 longer than the arm 16b, as shown in Figure 12, is mounted, the first fixing pin 24 is inserted into the connecting pin hole 30 formed in the front member 16, and both ends of the first fixing pin 24 in the axial direction are supported by the respective pin supports 26. In this way, the long front member 16 is installed and fixed to the support device 20.

[0031] As described above, the support device 20 of this embodiment comprises a frame 22, a first fixing pin 24, and each pin support base 26. Each pin support base 26 is detachably provided on a pair of upper ends 22a of the frame 22, thereby enabling smooth insertion of the first fixing pin 24 into the connecting pin hole 30 and support of the first fixing pin 24 on each pin support base 26. Therefore, processing of the front member 16 is not required, and the efficiency of the installation work of the front member 16 can be improved.

[0032] Furthermore, the pin support base 26 is equipped with a mounting mechanism 28 for attaching it to the upper end portion 22a of the frame 22. As described above, the mounting mechanism 28 has first pin holes 40, mounting portions 42, second pin holes 44, and second fixing pins 46. The pin support base 26 has its upper wall 42a of the mounting portion 42 in contact with the upper end portion 22a of the frame 22, and the second fixing pins 46 are inserted through the first pin holes 40 and the second pin holes 44, forming gaps G1 and G2, respectively, between the first pin holes 40 and the second pin holes 44 and the second fixing pins 46. As a result, the load of the front member 16 is transmitted from the upper end portion 22a to the frame 22, and no load is applied to the second fixing pins 46. Therefore, the durability of the second fixing pins 46 and, consequently, the support device 20 can be improved.

[0033] Furthermore, as described above, the pin receiving base 26 has a base body 50, a receiving portion 52, each third pin hole 54, a pin retainer 56, and each third fixing pin 58. The pin retainer 56 covers the radial upper part of the first fixing pin 24, preventing the first fixing pin 24 from falling out from above the pin receiving base 26. This improves the reliability of the support device 20.

[0034] Furthermore, the first fixing pin 24 is positioned to protrude outward in the axial direction X from the cover portion 56a of the pin retainer 56, and the pin retainer 56 integrally includes the aforementioned pin fall prevention plate 64. By covering the end face 24a of the first fixing pin 24 with the pin fall prevention plate 64, the first fixing pin 24 is prevented from falling out of the axial direction X in the pin support base 26. This further improves the reliability of the support device 20.

[0035] Furthermore, the pin retention plate 64 is formed within a range that fits into the receiving portion 52 in the axial direction X, and the pin retention plate 64 has the aforementioned constricted portion 64a. This allows the pin retainer 56 to rotate smoothly while avoiding interference with the pin retention plate 64. Therefore, the operability of the pin retainer 56, and consequently the support device 20, can be improved.

[0036] Furthermore, the angle α of the center of gravity C1 of the pin retainer 56 with respect to the vertical line L, which is based on the axis C3 of the third fixing pin 58 that serves as the pivot point, is greater than 0 degrees. As a result, when the pin retainer 56 is rotated by hand while being pushed around the axis C3 of the right-side third fixing pin 58, at least to the position where the vertical line L is formed, the pin retainer 56 will then rotate automatically due to its own weight even if the hand is released. Therefore, the rotation of the pin retainer 56 can be made smoother, further improving the operability of the pin retainer 56 and, consequently, the support device 20.

[0037] Furthermore, the base body 50 of the pin receiving base 26 has a stopper 66 that restricts the rotation of the pin retainer 56. As a result, after the pin retainer 56 rotates automatically due to its own weight, its rotation is stopped at the stopper 66 in a horizontal position. Therefore, since the rotation of the pin retainer 56 can be stopped automatically, the operability of the pin retainer 56, and by extension the support device 20, can be further improved.

[0038] This concludes the description of one embodiment of the present invention. However, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the invention. For example, the members and mechanisms constituting the support device 20 are not strictly limited to the configurations described or illustrated, as long as they have at least the functions described above. Furthermore, the front member 16 that can be supported by the support device 20 is not limited to those shown in Figures 4 and 12, nor is it limited to the front member 16 constituting the front device 8 of the hydraulic excavator 1. It is of course possible to support the front member 16 of various construction machines. [Explanation of Symbols]

[0039] 1. Hydraulic excavator (construction machinery) 8 Front device 16 Front component 20 Support device 22 mounting bases 22a Upper end 24. First fixed pin 24a End face 26 Pin Receiver 28 Mounting mechanism 30 connection pin holes 32 connection pins 40 First pin hole 42 Mounting part 42a Upper wall 42b 1st side wall 44 Second pin hole 46. ​​Second fixed pin 50 units 52 Receiving Department 52a Lower curved wall 52b Second side wall 54 Third pin hole 56 Pin retainer 56a Cover section 58 Third fixed pin 60. Fourth pin hole 64 Pin retention plate 64a Waist area 66 Stopper X-axis direction d diameter D Distance G1 Gap G2 Gap C1 Center of gravity C2 hole center C3 axis center L direct line α Angle of the center of gravity

Claims

1. A support device for placing and supporting the front member when the front device of a construction machine, which is formed by inserting connecting pins into connecting pin holes formed in the front member, is disassembled, A frame that supports the front member, A first fixing pin inserted into the aforementioned connection pin hole, The first fixing pin is supported at both ends in the axial direction from below, and a pair of pin receiving bases are detachably provided at the pair of upper ends of the frame. A support device for a front member of construction machinery, characterized by having the following features.

2. The pin holder is provided with a mounting mechanism for attaching it to the upper end of the frame, The aforementioned mounting mechanism is A first pin hole is drilled in the upper end of the frame, A mounting portion formed on the base body of the pin receiving base, including an upper wall and a pair of first side walls extending downward from both ends of the upper wall, A second pin hole is drilled in each of the pair of first side walls, A second fixing pin is inserted consistently through the first pin hole and the second pin hole. It has, The support device for a front member of a construction machine according to claim 1, characterized in that the pin receiving base has an upper wall that abuts against the upper end and the second fixing pin is inserted through the first pin hole and the second pin hole, and a gap is formed between the first pin hole and the second pin hole and the second fixing pin, respectively.

3. The aforementioned pin holder is The base body includes a lower curved wall formed thereon, which curves downward convexly along the radial lower part of the first fixing pin to receive the first fixing pin, and a receiving portion including a pair of second side walls extending upward from both ends of the lower curved wall, In the base body, a pair of third pin holes are drilled on both outer sides in the radial direction of the receiving portion, A pin retainer having a cover portion that covers the radially upper part of the first fixing pin, and a pair of fourth pin holes drilled on both radially opposite sides of the cover portion, A pair of third fixing pins are consistently inserted through the third pin hole and the fourth pin hole, respectively, located on the same side of the radially outer side of the receiving portion. The support device for a front member of a construction machine according to claim 2, characterized by having the following:

4. The first fixing pin is positioned to protrude outward in the axial direction from the cover portion of the pin retainer. The support device for a front member of a construction machine according to claim 3, characterized in that the pin retainer integrally has a pin fall prevention plate that faces the end face of the first fixing pin which is positioned to protrude and at a distance from it.

5. The pin fall prevention plate is formed within a range that fits into the receiving portion in the axial direction, The pin retainer is rotatable around the other third fixing pin by removing one of the third fixing pins. The support device for a front member of a construction machine according to claim 4, characterized in that the pin fall prevention plate has a constricted portion cut out to avoid contact with the receiving portion when the pin retainer rotates.

6. When the pin retainer rotates, and the fourth pin hole through which one of the third fixing pins was inserted is positioned directly above the other third fixing pin, a line is defined connecting the center of the fourth pin hole and the axis of the third fixing pin. The support device for a front member of a construction machine according to claim 5, characterized in that the angle of the center of gravity of the pin retainer with respect to the line directly above, with respect to the axis of the other third fixing pin as the starting point, is greater than 0 degrees.

7. The support device for a front member of a construction machine according to claim 6, characterized in that the base body has a stopper that restricts the rotation of the pin retainer.

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