JP5806986B2 - Protective frame for work equipment - Google Patents

Description

  The present invention relates to a protective frame for a work machine such as a backhoe.

A work frame such as a backhoe is provided with a protective frame to protect the control unit. This protective frame includes a four-column type or two-column type canopy and a two-column type canopy. Examples of the four-column type canopy are disclosed in Patent Documents 1 and 2.
The canopy has a rear part attached to the work machine frame at the rear part of the cockpit, a left and right side frame part disposed on the left and right sides of the cockpit, and a lower frame part connecting the lower ends of the left and right side frame parts, A mounting portion for attaching the lower frame portion to the work machine frame, a top frame portion that protrudes forward from the upper end of the left and right side frame portions and is disposed above the cockpit, and extends downward from the front end of the top frame portion. A front frame portion and a ceiling member provided on the top frame portion and covering the upper side of the cockpit, and a lower end of the front frame portion at the front is attached to the work implement frame in front of the cockpit. Yes.

  The mounting portion includes a pedestal fixed to the work machine frame, a pair of left and right vertical members connecting the lower frame portion on the upper surface of the pedestal, and an upper surface of the pedestal and a lower surface of the lower frame portion between the left and right vertical members. And a reinforcing material for connecting the two.

Japanese Patent No. 4932770 Japanese Patent No. 4393325

  In Patent Document 1, the lower frame portion of the protective frame is positioned higher than the upper surface of the pedestal, the reinforcing material is arranged perpendicular to the upper surface of the pedestal, and the left and right vertical members are tall plates. Because it is necessary, it is heavy and expensive, and it is far from the upper surface of the pedestal to the lower frame part, and if a forward load is applied to the upper part of the protective frame, the welding point of the upper end part of the reinforcing material Therefore, it is required to increase the welding strength.

In order to solve these problems, it is only necessary to lower the lower frame part and shorten the distance from the upper surface of the pedestal, but when welding the front and back of the upper end of the reinforcing material and the lower frame part, The front and rear parts of the pedestal become obstructions and the welding robot torch does not enter, making welding difficult. Therefore, it is difficult to reduce the weight of the protective frame by shortening the distance from the upper surface of the pedestal to the lower frame part.
An object of this invention is to provide the protection frame of the working machine which enabled it to solve such a subject of a prior art.

  It is an object of the present invention to provide a protective frame for a working machine that can reduce the distance from the upper surface of the pedestal to the lower frame portion and reduce the weight of the protective frame.

Specific means for solving the problems in the present invention are as follows.
First, a lower frame that is erected on the work machine behind the cockpit 3 and connects the left and right side frame portions 4 disposed on the left and right sides of the cockpit 3 and the lower ends of the left and right side frame portions 4. Part 5 and an attachment part 6 for attaching the lower frame part 5 to the work implement. The attachment part 6 is mounted on the base 7 fixed to the work implement and on the upper surfaces of the left and right side parts of the base 7. A protective frame for a working machine having a pair of left and right vertical members 8 that connect the frame portion 5 and a reinforcing member 9 that is welded to the upper surface of the base 7 and the lower surface of the lower frame portion 5 between the left and right vertical members 8. ,
The reinforcing member 9 is inclined forward and downward from the lower surface of the lower frame portion 5 to the upper surface of the pedestal 7 so that a welding torch can be inserted at a welding location A between the upper back surface of the reinforcing member 9 and the lower surface of the lower frame portion 5. Therefore, the center rear edge 7a of the pedestal 7 corresponding to the welding location A is closer to the welding location A in the front-rear direction than the rear edges 7b of the left and right side portions of the pedestal 7.

Secondly, the rear part of the base 7 forms a central rear edge 7a that is notched from the rear edge 7b of the left and right side parts and is displaced forward, and this central rear edge 7a is disposed almost directly below the welding location A. It is characterized by that.
Third, the left and right side frame portions 4 and the lower frame portion 5 are integrally formed by bending a round pipe material, and the reinforcing material 9 is inclined forward and downward through the pipe center of the lower frame portion 5. It is located on the line L.

Fourth, the left and right side portions of the pedestal 7 have bolt through holes 10 in front of the lower frame portion 5, and a bolt fastening tool insertion space S between the upper surface of the pedestal 7 and the lower surface of the lower frame portion 5. It is characterized by forming.
Fifthly, the mounting material 11 for mounting the rear surface arrangement member from the upper surface of the pedestal 7 to the upper surface of the lower frame portion 5 from the upper surface of the pedestal 7 to the upper surface of the lower frame portion 5 is formed between the pedestal 7 and the lower frame portion. 5 and is welded to 5.

According to this invention, the distance from the upper surface of a base to a lower frame part can be shortened, and a protective frame can be reduced in weight.
That is, in the invention according to claim 1, the reinforcing material 9 is inclined forward and downward from the lower surface of the lower frame portion 5 to the upper surface of the pedestal 7, and the welded portion between the upper back surface of the reinforcing material 9 and the lower surface of the lower frame portion 5 is arranged. Since the center rear edge 7a of the pedestal 7 corresponding to the welding location A is closer to the welding location A in the front-rear direction than the rear edge 7b of the left and right side portions of the pedestal 7 so that the welding torch can be inserted into the A, the pedestal 7 can be welded without obstruction, the distance from the upper surface of the base 7 to the lower surface of the lower frame portion 5 can be shortened, and the protective frame can be reduced in weight and strength.

In the invention according to claim 2, the rear part of the base 7 is cut out to form the central rear edge 7a that is displaced forward from the rear edge 7b of the left and right side parts. 7a can be disposed almost directly below the weld location A.
In the invention according to claim 3, since the reinforcing member 9 is located on the line L inclined forward and downward through the pipe center of the lower frame portion 5, the load received by the protective frame can be effectively supported.

In the invention according to claim 4, the left and right side portions of the pedestal 7 have bolt through holes 10 in front of the lower frame portion 5, and a space S is formed between the upper surface of the pedestal 7 and the lower surface of the lower frame portion 5. Since the bolt fastening tool can be inserted, even if the distance from the pedestal 7 to the lower frame portion 5 is shortened as much as possible, the attachment to the work machine is not hindered.
Since the invention which concerns on Claim 5 has welded the attachment material 11 which reaches the upper surface of the lower frame part 5 through the back of the lower frame part 5 from the upper surface of the base 7, not only a back surface arrangement | positioning member can be attached, The welding strength of the lower frame part 5 can also be increased.

1 is an overall side view showing an embodiment of the present invention. It is a cross-sectional left view of the principal part. It is a cross-sectional right view of the principal part. It is a perspective view of the principal part. It is a top view of an attaching part. It is a rear view of the principal part. It is a front view of the principal part. It is a whole perspective view. It is a right view of the whole backhoe.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1, 8, and 9, a back swivel backhoe is illustrated as a work machine 21, and this backhoe 21 has a swivel base 24 around a vertical axis on a traveling machine body 23 having a crawler-type left and right traveling device 22. The engine 25 and the counterweight 26 are disposed at the rear part of the swivel base 24, and the work device 27 for performing excavation work is disposed at the front part of the swivel base 24.

On the swivel base 24, the front part of the engine 25 is divided into right and left, a control part having a cockpit 3 on the left side and a protection frame (four-column canopy) 1 for the cockpit are arranged, and a hydraulic oil tank 28 on the right side. Vehicle devices 29 such as a control valve 29b and a battery 29c are arranged.
A support frame 31 is provided at the rear portion of the swivel base 24 so as to straddle the engine 25, and a fixed engine cover 32 that covers the rear portion of the protective frame 1, the upper side and the front side of the engine 25, and the engine 25. A rear bonnet 33 that can be opened and closed is supported, and the left and right side surfaces from the front of the swivel base 24 to the counterweight 26 are covered with a swivel base cover 34, respectively.

1 to 9, the support frame 31 is fixed to a swivel base 24 and constitutes a part of the work machine frame F of the backhoe 21 together with the swivel base 24. The rear part of the protective frame 1 is attached, and the front part of the protective frame 1 is attached to the left and right front parts of the swivel base 24.
The protective frame 1 includes a left and right side frame portion 4 disposed at the left and right rear of the cockpit 3, a lower frame portion 5 that connects the lower ends of the left and right side frame portions 4, and the lower frame portion 5 as a work machine frame. An attachment portion 6 to be mounted on the support frame 31 of F, a top frame portion 12 that protrudes forward from the upper end of the left and right side frame portion 4 and is disposed above the cockpit 3, and a front end of the top frame portion 12. A front frame portion 13 that extends downward and has a lower end attached to the work machine frame F in front of the cockpit 3 and a ceiling member 14 that is provided on the top frame portion 12 and covers the upper side of the cockpit 3.

The protective frame 1 is formed by bending the center of one round pipe material into a substantially U-shape (U-shape) when viewed from the front to form a lower frame portion 5 and side frame portions 4 at both left and right ends thereof. The upper end of the part 4 is bent in a substantially L shape in a side view to form the rear end of the left and right top frame parts 12 to the middle part. The left and right frame parts 4 are connected by a horizontal connecting member 15.
And the protective frame 1 connects the round pipe material bent in the side view substantially L shape to the middle part of the left and right top frame parts 12, and the right and left front frames from the middle part of the left and right top frame parts 12 to the front end part. Part 13 is formed.

At the lower part of the left and right front frame part 13, a fixing plate 13 </ b> A at the lower end and a connecting plate 13 </ b> B are welded, and this fixing plate 13 </ b> A is bolted to a stay 37 erected from the bottom plate of the swivel base 24.
1-8, the attaching part 6 provided in the lower frame part 5 has the base frame 7 fixed on the work machine frame F (support frame 31) and the lower frame part 5 on the upper surfaces of the left and right side parts of the base 7. A pair of left and right vertical members 8 to be connected and a reinforcing member 9 for welding the upper surface of the base 7 and the lower surface of the lower frame portion 5 between the left and right vertical members 8 are provided.

The pedestal 7, the left and right vertical members 8 and the reinforcing material 9 are formed of a plate material, the bolt through holes 10 are formed on both the left and right side portions, and the pedestal 7 having the cutout portion 7A is formed by cutting out the rear portion of the band plate. A vertical member 8 is formed by cutting out the upper part of the plate in an arc shape, and the reinforcing plate 9 is used as it is.
The left and right vertical members 8 are welded upright on the left and right side portions of the pedestal 7 with the rear left and right central portions cut out, and the lower frame portion 5 is applied to the arc-shaped cutouts of the left and right vertical members 8. Is welded.

Since the left and right side portions of the cutout portion 7 </ b> A are left long in the front and rear of the pedestal 7, the welding length with the left and right vertical members 8 is ensured.
Moreover, the bolt through-hole 10 is located on the left and right outer sides with respect to the left and right vertical members 8 and on the front side with respect to the lower frame portion 5, thereby enabling bolt insertion from above.
Since the head of the bolt inserted into the bolt through hole 10 is located on the upper surface of the pedestal 7, a space S formed between the upper surface of the pedestal 7 and the lower surface of the lower frame portion 5 can be inserted with a bolt fastening tool. The space S is made as small as possible, and the distance from the upper surface of the base 7 to the lower surface of the lower frame portion 5 is set. Making the space S as small as possible reduces the vertical width of the left and right vertical members 8 and reduces the weight.

The reinforcing material 9 is disposed between the left and right vertical members 8 so as to be inclined forward and downward from the lower surface of the lower frame portion 5 to the upper surface of the pedestal 7, and the upper and lower ends of the reinforcing material 9 and the lower frame portion 5 and the pedestal 7 are arranged. Welding.
The upper end of the reinforcing member 9 is radially applied to the lower surface of the lower frame portion 5, that is, disposed on a line L inclined forward and downward through the center of the pipe of the lower frame portion 5, with respect to the upper surface of the base 7. Then, it is arranged in a rearward upward inclined shape, and welding is performed by inserting a torch T (shown in FIG. 2) of the welding robot with the upper and lower ends of the reinforcing material 9 as welding locations.

In addition, although the angle of the line L with respect to the upper surface of the said base 7 is set to 45 degree | times by embodiment, it can set in the range of 30-60 degree | times.
Since the outer periphery of the lower frame portion 5 is circular and deviated forward from directly below the center of the pipe of the lower frame portion 5, the upper end on the surface side of the reinforcing material 9 is between the lower surface of the lower frame portion 5. The welding torch T can be inserted into the welding location from the front lower side without any obstacle.

Since the lower end on the surface side of the reinforcing member 9 is displaced forward from the upper end, the welding torch T can be inserted from the front upper side into the welded portion between the upper surface of the base 7 without hindrance.
Since the lower end of the back surface side of the reinforcing material 9 is displaced forward from the upper end, the angle between the upper surface of the base 7 (45 degrees in the embodiment) is when the reinforcing material 9 is arranged vertically. However, since it is 30 degrees or more, the welding torch T can be inserted from the rear upper side at a substantially central angle of the included angle without hindrance.

The upper end on the back side of the reinforcing member 9 is deviated rearward from the lower end, but overlaps with the front-rear width of the left and right side portions of the base 7 in the front-rear direction. A notch 7A is formed in the rear part of the central part (reinforcement material welding range) between the left and right side parts of the pedestal 7, and the central rear edge 7a of the rear part of the pedestal 7 is more forward than the rear edge 7b of the left and right side parts. Is located.
Accordingly, the central rear edge 7a of the base 7 is located almost immediately below the welded portion A between the upper back surface of the reinforcing member 9 and the lower surface of the lower frame portion 5, and this welded portion A is located behind the central rear edge 7a of the base 7. If the cutout portion 7A is not formed and the notch portion 7A is not formed, when the welding torch T is inserted at the center angle of the sandwich angle θ between the reinforcing member 9 and the lower frame portion 5, the rear portion of the base 7 is Although the welding torch T cannot be inserted due to an obstacle, the formation of the cutout portion 7A makes it possible to insert the welding torch T from the lower rear side at the center angle of the included angle θ without any obstacle. ing.

In addition, a mounting member 11 for attaching a rear surface arrangement member is welded to the mounting portion 6 between the left and right vertical members 8. The attachment material 11 is formed by bending a flat plate, and is welded to the pedestal 7 and the lower frame portion 5 from the upper surface of the pedestal 7 to the upper surface of the lower frame portion 5 through the rear of the lower frame portion 5. Has been.
Since the lower part of the mounting material 11 is welded to the upper surface of the pedestal 7 and the upper part is welded to the upper surface of the lower frame part 5, the connection between the pedestal 7 and the lower frame part 5 is reinforced like the reinforcing material 9. Yes.

  As the back surface arrangement member 40 attached to the attachment member 11, there is an exhaust gas shielding plate shown in FIG. The exhaust gas of the engine 25 is discharged from the tail pipe 42 through a diesel particulate filter (DPF), and the tail pipe 42 protrudes upward from the engine cover 32 or the rear bonnet 33. An exhaust gas shielding plate is arranged on the front side of the tail pipe 42 so that the exhaust gas does not flow to the cockpit 3 side.

In the present invention, the shape of each member and the positional relationship between the front, back, left, right, and top in the embodiment are best configured as shown in FIGS. However, it is not limited to the said embodiment, A member, a structure can be variously deformed, and a combination can also be changed.
The protection frame 1 may be fixed on the swivel base 24 for all four columns, and may be erected on the work machine 21. Instead of the four-column canopy, the left and right side frame portions 4, the lower frame portion 5, and the attachment portion 6 The two-frame canopy having a ceiling member (a awning member) 13 up to the middle of the top frame portion 12, or the left and right side frame portions having the left and right side frame portions 4, the lower frame portion 5 and the mounting portion 6. The lops which connected the upper ends of 4 with the upper frame part may be sufficient.

  The back surface arrangement member 40 may be a work lamp or the like.

DESCRIPTION OF SYMBOLS 1 Protective frame 3 Pilot seat 4 Side frame part 5 Lower frame part 6 Attachment part 7 Base 7A Notch part 7a Center rear edge 7b Rear edge 8 Vertical material 9 Reinforcement material 10 Bolt through-hole 11 Attachment material 21 Working machine (backhoe)
24 swivel base 40 back arrangement member A welding location F work machine frame L line S space where bolt fastening tool can be inserted T welding torch

Claims (5)

A left and right side frame (4) disposed on the left and right sides of the cockpit (3) and a lower end of the left and right side frame (4) are erected on the work machine behind the cockpit (3). It has a lower frame part (5) to be connected and an attachment part (6) for attaching the lower frame part (5) to the work machine, and the attachment part (6) is a base (7) fixed to the work machine. ), A pair of left and right vertical members (8) connecting the lower frame portion (5) on the upper surfaces of the left and right side portions of the pedestal (7), and the upper surface of the pedestal (7) between the left and right vertical members (8) A protective frame for a working machine having a reinforcing material (9) welded to the lower surface of the lower frame part (5),
The reinforcing material (9) is inclined forward and downward from the lower surface of the lower frame portion (5) to the upper surface of the pedestal (7), and the upper portion of the back surface of the reinforcing material (9) and the lower surface of the lower frame portion (5) are welded. In order to allow the welding torch (T) to be inserted into the location (A), the central rear edge (7a) of the base (7) corresponding to the weld location (A) is used as the rear edge (7b) of the left and right sides of the base (7). ) Is closer to the welding location (A) in the front-rear direction than in FIG.   The rear part of the pedestal (7) forms a central rear edge (7a) that is notched from the rear edge (7b) of the left and right side parts and is displaced forward, and this central rear edge (7a) is welded ( 2. The protective frame for a working machine according to claim 1, wherein the protective frame is disposed immediately below A).   The left and right side frame parts (4) and the lower frame part (5) are integrally formed by bending a round pipe material, and the reinforcing material (9) passes through the center of the pipe of the lower frame part (5). The protective frame for a working machine according to claim 1 or 2, wherein the protective frame is located on a line (L) inclined downward.   The left and right sides of the pedestal (7) have bolt through holes (10) in front of the lower frame part (5), and bolts between the upper surface of the pedestal (7) and the lower surface of the lower frame part (5). The protection frame of the working machine according to any one of claims 1 to 3, wherein a fastening tool insertion space (S) is formed.   A mounting member (11) for mounting the rear surface arrangement member between the left and right vertical members (8) from the upper surface of the pedestal (7) to the upper surface of the lower frame portion (5) through the rear of the lower frame portion (5), The work frame protective frame according to any one of claims 1 to 4, wherein the work frame is welded to the base (7) and the lower frame (5).

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