Construction machinery work attachments

Abstract

To provide a work attachment of a construction machine which can constitute a connection part for connecting connected bodies with a smaller number of components.SOLUTION: A work attachment includes a main boom 1 and an insert boom. A connection part 3 of the main boom 1 has a pair of opposite separation plates 31L and 33L, and a pair of opposite separation plates 31R and 33R, which are provided on both end sides in a width direction of the main boom 1. In the separation plates 31L and 33L, a pair of connection pin holes 311L an 331L capable of inserting and detaching a hydraulic pin 7, and a pair of support pin holes 312L and 332L capable of inserting and detaching a support pin rotatably supporting a cylinder tip are formed. In the separation plates 31R and 33R, a pair of connection pin holes 311R an 331R capable of inserting and detaching the hydraulic pin 7, and a pair of support pin holes 312R and 332R capable of inserting and detaching the support pin rotatably supporting the cylinder tip are formed.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a work attachment for a construction machine. [Background technology]

[0002] Conventionally, in the field of construction machinery, technologies related to connecting pins that connect each connecting body such as a main boom, an insert boom, and a front boom that constitute a work attachment have been considered. For example, Patent Document 1 discloses a work attachment for reducing the space required to pull out the connecting pin to the inside.

[0003] In the above-mentioned Patent Document 1, a configuration is adopted in which the main boom (7) and the first extension boom (8) are connected by upper connecting pins (25A, 25B) and lower connecting pins (26A, 26B) (see FIG. 3 of Patent Document 1). The upper connecting pins (25A, 25B) are held by an upper holding mechanism (27A), and the lower connecting pins (26A, 26B) are held by a lower holding mechanism (27B).

[0004] As shown in Fig. 3 of Patent Document 1, the side plate (18) of the main boom (7) has an attachment portion (18a) that protrudes toward the tip side beyond the top plate (19) and the bottom plate (20). An upper pin hole (18b) and a lower pin hole (18c) are formed in the attachment portion (18a).

[0005] Further, a boom cylinder (14) for raising and lowering the main boom (7) relative to the revolving frame (5) is provided on a side plate (18) of the main boom (7) (see FIG. 1 of Patent Document 1). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2013-67967 A Summary of the Invention [Problem to be solved by the invention]

[0007] In the above-mentioned Patent Document 1, the tip of the boom cylinder (14) is provided on the side plate (18) of the main boom (4). Meanwhile, the upper connecting pins (25A, 25B) and the lower connecting pins (26A, 26B) are provided in upper pin holes (18b) and lower pin holes (18c) formed in the mounting portion (18a). In other words, in the above-mentioned Patent Document 1, the cylinder bracket for mounting the cylinder and the connecting pin bracket for mounting the connecting pin are configured from different members. As a result, the above-mentioned Patent Document 1 has a problem in that the number of parts increases, and as a result, the number of welding points also increases.

[0008] Therefore, an object of the present invention is to provide a work attachment for a construction machine in which the connecting portion that connects the connected objects to each other can be constructed using a smaller number of parts. [Means for solving the problem]

[0009] In order to achieve the above object, the present invention provides a work attachment for a construction machine, comprising a first connected body having a connecting portion at one end side in the longitudinal direction, and a second connected body connected to the first connected body via the connecting portion, the connecting portion having a pair of opposing spacer plates at both ends in the width direction of the first connected body, the pair of opposing spacer plates being composed of an outer plate and an inner plate facing each other on the inside of the outer plate with a gap therebetween, a mounting plate that can be inserted and removed between the pair of opposing spacer plates is provided at an end of the second connected body that is connected to the first connected body via the connecting portion, the pair of opposing spacer plates are each formed with a pair of connecting pin holes through which a connecting pin connecting the first connected body and the second connected body can be inserted and removed, and the pair of opposing spacer plates are each formed with a pair of support pin holes through which a support pin that rotatably supports a tip end of a cylinder can be inserted and removed, and the mounting plate is formed with connecting pin holes that match the pair of connecting pins when inserted between the pair of opposing spacer plates, and through which the connecting pins can be inserted and removed.

[0010] Here, the first connected body has a pair of side plates opposed to each other in the width direction, an upper plate connecting upper ends of the pair of side plates, and a bottom plate connecting lower ends of the pair of side plates, and the outer plate of the pair of opposed spacer plates is the second plate of the pair of side plates. connected body It is preferable that the connecting portion is configured with a protruding portion on the side to which the connecting portion is connected.

[0011] Furthermore, it is preferable that the connecting pin extends from the center line side of the longitudinal direction of the first connected body toward the lateral side in the width direction, and the width of the gap between the outer plate and the inner plate of the pair of opposing spacing plates has a length that allows the mounting plate to be inserted and removed even when a portion of the tip of the connecting pin protrudes toward the lateral side from the inner plate.

[0012] Furthermore, it is preferable to further include a protective member surrounding an outer periphery of a portion of the tip of the connecting pin that protrudes laterally from the inner plate. Effect of the Invention

[0013] According to the present invention, the connecting portion has a pair of opposing spacer plates, and the spacer plates are each formed with a connecting pin hole into which a connecting pin that connects the first connected body and the second connected body can be inserted and removed, and each formed with a support pin hole into which a support pin that rotatably supports the tip of the cylinder can be inserted and removed. In other words, the pair of spacer plates function as mounting members for the connecting pin and also function as mounting members for the support pin. In other words, the connecting pin bracket and the cylinder bracket can be made to be the same. Therefore, it is possible to construct the connecting portion that connects the first connected body and the second connected body with fewer parts, and the number of welding points in the connecting portion can be reduced. [Brief description of the drawings]

[0014] [Figure 1] 1A is a perspective view of a work attachment of a construction machine according to an embodiment of the present invention, as seen from the left front lower side, and FIG. 1B is a perspective view of a work attachment of a construction machine according to an embodiment of the present invention, as seen from the right rear upper side. [Diagram 2]1A is a perspective view of the main boom (first connected body) as seen from the left front lower side, and FIG. 1B is a perspective view of the main boom (first connected body) as seen from the left front upper side. [Diagram 3] FIG. 3 is a view taken along the line III in FIG. 2(B). [Figure 4] 1A is a perspective view of the insert boom (second connected body) from the front lower left side, and (B) is a perspective view of the insert boom (second connected body) from the rear upper right side. [Diagram 5] A view of the insert boom (second connected body) from the ventral side. [Figure 6] A view of the main boom (first connected body) from the ventral side. [Figure 7] A ventral view of the main boom connected to the insert boom. [Figure 8] A close-up of the hydraulic pin area. [Figure 9] FIG. 4 is a side view of the hydraulic pin and the protective cover. [Figure 10] FIG. 11 is a perspective view of a main boom according to a modified example, viewed from the left front lower side. [Figure 11] XI arrow view of FIG. 10 . DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] <1. Embodiment> A work attachment for a construction machine according to an embodiment of the present invention will be described with reference to Figures 1 to 9. In the following, a work attachment 10 shown in Figure 1 will be illustrated as an example of a work attachment for a construction machine.

[0016] 1(A) and (B), the work attachment 10 is configured to include a main boom 1 and an insert boom 2 connected to the tip of the main boom 1. The main boom 1 is provided with a pair of left and right hydraulic cylinders 5L, 5R for raising and lowering the main boom 1 relative to a revolving frame (not shown).

[0017] The main boom 1 is an example of a first connected body according to the present invention, and the insert boom 2 is an example of a second connected body according to the present invention.

[0018] As shown in Figures 2(A) and (B), the main boom 1 is composed of a pair of side plates 12 (12L, 12R) facing each other in the width direction, an upper plate 13 connecting the upper ends of the pair of side plates 12L, 12R, and a bottom plate 11 connecting the lower ends of the pair of side plates 12L, 12R.

[0019] In addition, in FIGS. 2(A) and (B), the lead line of the right side plate 12R, which is hidden and cannot be seen, is shown by a dashed line for the sake of convenience.

[0020] Further, the main boom 1 is provided with a connecting portion 3 on the tip side in the longitudinal direction. The connecting portion 3 is a portion for connecting (connecting) the insert boom 2 to the tip side of the main boom 1.

[0021] As shown in Figs. 2 and 3, the connecting portion 3 is provided with a pair of opposing spacing plates 31L, 33L on the left end side of the main boom 1, and is provided with a pair of opposing spacing plates 31R, 33R on the right end side of the main boom 1.

[0022] The pair of opposing spacing plates 31L, 33L is composed of an outer plate 31L and an inner plate 33L provided on the inside of the outer plate 31L to face each other across a gap 32L. The pair of opposing spacing plates 31R, 33R is composed of an outer plate 31R and an inner plate 33R provided on the inside of the outer plate 31R to face each other across a gap 32R.

[0023] First, the outer plates 31L, 31R will be described. The outer plate 31L is provided integrally as part of the left side plate 12L so as to be flush with and continuous with the left side plate 12L of the main boom 1. Specifically, the outer plate 31L is formed by a portion of the left side plate 12L of the main boom 1 that protrudes toward the tip side (i.e., the side to which the insert boom 2 is connected).

[0024] Similarly, the outer plate 31R is provided integrally as part of the right side plate 12R so as to be flush with and continuous with the right side plate 12R of the main boom 1. Specifically, the outer plate 31R is formed by a portion of the right side plate 12R of the main boom 1 that protrudes toward the tip side (i.e., the side to which the insert boom 2 is connected).

[0025] Hooks 35L, 35R are provided on the upper tip sides of the outer panels 31L, 31R, respectively, as members for connecting attachments. When the insert boom 2 is connected to the tip side of the main boom 1 via the connecting part 3, a connecting pin (not shown) provided on the insert boom 2 engages with the hooks 35L, 35R.

[0026] The outer plate 31L has a connecting pin hole 311L, through which the connecting hydraulic pin 7 (see FIG. 6) can be inserted and removed, formed at a position slightly below the center so as to penetrate the plate in the width direction (left and right direction). Furthermore, the outer plate 31L has a support pin hole 312L, through which a support pin (not shown) that rotatably supports the tip of the left hydraulic cylinder 5L can be inserted and removed, formed at the lower end side so as to penetrate the plate in the width direction.

[0027] Similarly, a connecting pin hole 311R, into which the hydraulic pin 7 (see FIG. 6) can be inserted and removed, is formed in the outer plate 31R at a position slightly below the center so as to penetrate the plate in the width direction (left and right direction). Furthermore, a support pin hole 312R, into which a support pin (not shown) that rotatably supports the tip of the right hydraulic cylinder 5R can be inserted and removed, is formed in the outer plate 31R at a position slightly below the center so as to penetrate the plate in the width direction.

[0028] Next, the inner plates 33L, 33R will be described. The inner plates 33L, 33R are independently provided on the bottom plate 11 of the main boom 1 so as to face the outer plates 31L, 31R, respectively.

[0029] In the inner plate 33L, a connecting pin hole 331L into which the hydraulic pin 7 (see FIG. 6) can be inserted and removed is formed at the same height as the connecting pin hole 311L. In other words, the connecting pin hole 331L is provided at a position overlapping with the connecting pin hole 311L when viewed from the side.

[0030] Further, in the inner plate 33L, a support pin hole 332L into which a support pin (not shown) that rotatably supports the tip end of the left hydraulic cylinder 5L can be inserted and removed is formed at the same height as the support pin hole 312L. In other words, the support pin hole 332L is provided at a position overlapping with the support pin hole 312L when viewed from the side.

[0031] Similarly, in the inner plate 33R, a connecting pin hole 331R into which the hydraulic pin 7 (see FIG. 6) can be inserted and removed is formed at the same height as the connecting pin hole 311R. In other words, the connecting pin hole 331R is provided at a position overlapping with the connecting pin hole 311R when viewed from the side.

[0032] Further, in the inner plate 33R, a support pin hole 332R into which a support pin (not shown) that rotatably supports the tip end of the right hydraulic cylinder 5R can be inserted and removed is formed at the same height as the support pin hole 312R. In other words, the support pin hole 332R is provided at a position overlapping with the support pin hole 312R when viewed from the side.

[0033] Next, a description will be given of the insert boom 2. As shown in Figures 4(A) and (B), the insert boom 2 has a pair of mounting plates 22L, 22R. The pair of mounting plates 22L, 22R are integrally formed so as to be continuous with a pair of side plates facing each other in the width direction.

[0034] Specifically, the mounting plates 22L, 22R are configured as parts of a pair of side plates that configure the insert boom 2. In other words, parts of the pair of side plates on the main body side are used as the mounting plates 22L, 22R.

[0035] The left mounting plate 22L is inserted into the gap 32L (see FIG. 3) between the pair of opposing spacing plates 31L, 33L described above when the insert boom 2 is connected to the main boom 1. The right mounting plate 22R is inserted into the gap 32R (see FIG. 3) between the pair of opposing spacing plates 31R, 33R described above when the insert boom 2 is connected to the main boom 1.

[0036] Further, the pair of mounting plates 22L, 22R are formed with connecting pin holes 222L, 222R, respectively, into which the hydraulic pin 7 (see FIG. 6) can be inserted and removed.

[0037] When connecting the insert boom 2 to the main boom 1, the left mounting plate 22L is inserted into the gap 32L between the pair of opposing spacing plates 31L, 33L so that the connecting pin hole 222L aligns with the connecting pin holes 311L, 331L. Also, the right mounting plate 22R is inserted into the gap 32R between the pair of opposing spacing plates 31R, 33R so that the connecting pin hole 222R aligns with the connecting pin holes 311R, 331R.

[0038] When the connecting pin hole 222L aligns with the connecting pin holes 311L, 331L and the connecting pin hole 222R aligns with the connecting pin holes 311R, 331R, the hydraulic pin 7 (see Figure 6) is inserted into each, and the insert boom 2 is connected to the main boom 1.

[0039] 6, the hydraulic pin 7 is installed between the inner plate 33L and the inner plate 33R. The hydraulic pin 7 includes a left pin extending from the center line CL side in the longitudinal direction of the main boom 1 toward the left side in the width direction of the main boom 1, and a right pin extending from the center line CL side toward the right side in the width direction.

[0040] A protective cover 7C that protects the outer periphery of the left pin of the hydraulic pin 7 is provided on the surface of the inner plate 33L facing outward (left side). A protective cover 7C that protects the outer periphery of the right pin of the hydraulic pin 7 is provided on the surface of the inner plate 33R facing outward (right side). The specific structure of the protective cover 7C will be described in detail later.

[0041] 7 is a diagram showing a state in which the insert boom 2 shown in FIG. 5 is connected to the main boom 1 shown in FIG. 6. As shown in FIG. 7, the mounting plate 22L of the insert boom 2 is inserted between the outer plate 31L and the protective cover 7C provided on the inner plate 33L. That is, even if the left pin of the hydraulic pin 7 protrudes outward from the inner plate 33L and exists inside the protective cover 7C, the mounting plate 22L can be inserted and removed. In other words, the width of the gap 32L between the outer plate 31L and the inner plate 33L has a length that allows the mounting plate 22L to be inserted and removed even in a state in which a part of the tip of the left pin of the hydraulic pin 7 protrudes leftward from the inner plate 33L.

[0042] Similarly, the mounting plate 22R of the insert boom 2 is inserted between the outer plate 31R and the protective cover 7C provided on the inner plate 33R. That is, even if the right pin of the hydraulic pin 7 protrudes outward from the inner plate 33R and is present inside the protective cover 7C, the mounting plate 22R can be inserted and removed. In other words, the width of the gap 32R between the outer plate 31R and the inner plate 33R has a length that allows the mounting plate 22R to be inserted and removed even in a state in which a part of the tip of the right pin of the hydraulic pin 7 protrudes rightward from the inner plate 33R.

[0043] Next, the protective covers 7C provided on the inner plates 33L and 33R will be described. The protective covers 7C are common to both the left and right. Therefore, the following describes the protective cover 7C provided on the right inner plate 33R, and omits the description of the protective cover 7C provided on the left inner plate 33L.

[0044] As shown in FIG. 8, protective cover 7C is configured as a top hat-shaped member including a flange portion 71C and a cylindrical portion 73C.

[0045] The flange portion 71C is in surface contact with the right inner plate 33R. As shown in Fig. 9, the flange portion 71C is fixed at about four points by bolts BT in a state of surface contact with the surface of the inner plate 33R facing to the right.

[0046] The cylindrical portion 73C extends rightward from the flange portion 71C and is a member into which the right pin of the hydraulic pin 7 can be inserted. The cylindrical portion 73C surrounds the outer periphery of the hydraulic pin 7 protruding rightward from the inner plate 33R.

[0047] According to the embodiment described above, the connecting portion 3 has a pair of opposing spacer plates 31L, 33L and a pair of opposing spacer plates 31R, 33R. The pair of opposing spacer plates 31L, 33L are each formed with connecting pin holes 311L, 331L into which the hydraulic pin 7 can be inserted and removed, and also formed with support pin holes 312L, 332L into which a support pin that rotatably supports the tip end of the left hydraulic cylinder 5L can be inserted and removed.

[0048] In addition, the pair of opposing spacing plates 31R, 33R are each formed with connecting pin holes 311R, 331R, into which the hydraulic pin 7 can be inserted and removed, and are also each formed with support pin holes 312R, 332R, into which a support pin that rotatably supports the tip of the right-side hydraulic cylinder 5R can be inserted and removed.

[0049] In other words, the pair of opposing spacer plates 31L, 33L and the pair of opposing spacer plates 31R, 33R function as mounting members for the hydraulic pin 7 and also function as mounting members for the support pin. In other words, the connecting pin bracket and the cylinder bracket can be made common. This makes it possible to configure the connecting part 3 that connects the main boom 1 and the insert boom 2 with a smaller number of parts, and reduces the number of welding points in the connecting part 3.

[0050] In particular, according to the embodiment described above, the outer plate 31L is provided integrally as part of the left side plate 12L so as to be continuous and flush with the left side plate 12L of the main boom 1. Also, the outer plate 31R is provided integrally as part of the right side plate 12R so as to be continuous and flush with the right side plate 12R of the main boom 1. This makes it possible to further reduce the number of parts in the connecting portion 3, thereby reducing material costs and welding man-hours.

[0051] According to the embodiment described above, the width of the gap 32L between the outer plate 31L and the inner plate 33L is long enough to allow the mounting plate 22L to be inserted and removed even when a part of the tip of the left pin of the hydraulic pin 7 protrudes leftward from the inner plate 33L. Also, the width of the gap 32R between the outer plate 31R and the inner plate 33R is long enough to allow the mounting plate 22R to be inserted and removed even when a part of the tip of the right pin of the hydraulic pin 7 protrudes rightward from the inner plate 33R.

[0052] Therefore, the welding workability is good, the number of work steps is reduced, and the occurrence of welding defects can be suppressed.

[0053] Furthermore, according to the embodiment described above, since the protective covers 7C are provided on the inner plates 33L, 33R, respectively, it is possible to protect the outer periphery of the left pin and the outer periphery of the right pin of the hydraulic pin 7 protruding outward from the inner plates 33L, 33R. In particular, when connecting the insert boom 2 to the main boom 1, it is possible to prevent the mounting plates 22L, 22R from coming into contact with the outer periphery of the left pin or the outer periphery of the right pin of the hydraulic pin 7.

[0054] <2. Modifications> The working attachment for a construction machine according to the present invention is not limited to the above-described embodiment, and various modifications and improvements are possible within the scope of the claims.

[0055] For example, in the above embodiment, as shown in Fig. 2(A), the case where the two hooks 35L, 35R are provided on the upper part of the tip side of the outer plates 31L, 31R in the connecting portion 3 is illustrated, but the present invention is not limited to this. As shown in Figs. 10 and 11, two more hooks 36L, 36R may be provided between the two hooks 35L, 35R.

[0056] In the above-described modified example, as shown in FIG. 11, the two hooks 36L, 36R are formed as separate members from the inner plates 33L, 33R. However, this is not limited to this, and the two hooks may be formed as a single continuous member.

[0057] In the above embodiment, the insert boom 2 is connected to the main boom 1 by the hydraulic pin 7 inserted from the center line CL toward the left and right sides, but the present invention is not limited to this. The insert boom 2 may be connected to the main boom 1 using a hydraulic pin inserted from the outer plate side toward the center line CL. Also, a manual pin may be used instead of a hydraulic pin.

[0058] In addition, in the above-described embodiment, an example was given of the outer plates 31L, 31R and the inner plates 33L, 33R being constructed from a single plate member without any welded joints or bends, but this is not limited to this, and the outer plates and inner plates may be constructed from members having welded joints or bends.

[0059] In the above embodiment, the hooks 35L and 35R are used as an example of a member for connecting an attachment, but the present invention is not limited to this. Instead of the hooks 35L and 35R, the corresponding portions may be formed with a pinhole structure through which a connection pin can be inserted. [Industrial Applicability]

[0060] As described above, the work attachment for a construction machine according to the present invention is suitable for connecting an insert boom to a main boom, for example. [Explanation of symbols]

[0061] 1 Main Boom 2 Insert Boom 3 Connecting part 5L, 5R hydraulic cylinder 7 Hydraulic Pin 7C Protective cover 10 Work attachment 11 Bottom plate 12L,12R side plate 13 Upper Board 22L, 22R mounting plate 31L, 31R Outer plate 31L, 33L A pair of opposing spacers 31R, 33R A pair of opposing spacers 32L,32R gap 33L,33R inner plate 35L, 35R hook 36L, 36R hook 71C Flange part 73C Cylindrical section 222L,222R connecting pin hole 311L,331L connecting pin hole 311R,331R connecting pin hole 312L,332L Support pin hole 312R,332R Support pin hole

Claims

1. A work attachment for a construction machine, comprising: A first connected body having a connecting portion on one end side in a longitudinal direction; A second connected body connected to the first connected body via the connecting portion; Equipped with The connecting portion has a pair of opposing spaced plates, each of which is made up of an outer plate and an inner plate opposed to each other on the inside of the outer plate with a gap therebetween, at both ends in a width direction of the first connected body, an attachment plate that can be inserted between the pair of opposing spacing plates is provided at an end of the second connected body that is connected to the first connected body via the connecting portion; The pair of opposing spacing plates are each formed with a pair of connecting pin holes into which a connecting pin that connects the first connected body and the second connected body can be inserted and removed, and also formed with a pair of support pin holes into which a support pin that rotatably supports a tip end of a cylinder can be inserted and removed, A work attachment for a construction machine, characterized in that the mounting plate is formed with connecting pin holes that match the pair of connecting pins when inserted between the pair of opposing spacer plates, and through which the connecting pins can be inserted and removed.

2. the first connected body has a pair of side plates opposed to each other in the width direction, an upper plate connecting upper ends of the pair of side plates, and a bottom plate connecting lower ends of the pair of side plates, 2. A work attachment for a construction machine as described in claim 1, characterized in that the outer plate of the pair of opposing spacer plates is formed by a protruding portion of the pair of side plates toward the side to which the second connectable body is connected.

3. the connecting pin extends from a center line side in a longitudinal direction of the first connected body toward a lateral side in the width direction, 3. A work attachment for a construction machine as described in claim 1 or 2, characterized in that the width of the gap between the outer plate and the inner plate of the pair of opposing spacing plates has a length that allows the mounting plate to be inserted and removed even when a portion of the tip of the connecting pin protrudes to the lateral side from the inner plate.

4. 4. The work attachment for a construction machine according to claim 3, further comprising a protective member surrounding an outer periphery of the tip portion of the connecting pin that protrudes laterally from the inner plate.

Images