JP2011241644A - Mounting structure of safety fence of work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mounting structure of a safety fence of a work machine which allows the production of a safety fence and other mounting parts to be easy, and allows easy assembling by only one worker to be realized.SOLUTION: In the mounting structure of the safety fence, a cylindrical body 26 and a mounting seat 27 are provided on a step 22. A safety fence 23 is supported by the cylindrical body 26 in such a way that a mounting leg 23c having a thread part is inserted through the cylindrical body 26 and a stopper part 23e is mounted on the top of the cylindrical body 26. The mounting leg 23c having thread part is fixed to the cylindrical body 26 by a fixing bolt 28 capable of being screwed with female screw part of the mounting leg 23c or nuts capable of being screwed with male screw parts of the mounting leg 23c. The other mounting leg 23c having a bracket 24 is fixed to the mounting seat 27 in such a way that fixing bolts 25 are freely fitted to the bolt insertion hole 24a of the bracket 24 fixed to the other mounting leg 23c and are screwed to be fastened to thread holes 27a of the mounting seat 27.

Description

  The present invention relates to a safety fence that is attached to a vehicle body of a working machine such as a hydraulic excavator or a dismantling machine, and is attached to a step that is used as a scaffold or a passage by an operator, maintenance personnel, or the like.

  Work machines such as hydraulic excavators and dismantling machines are often provided with a passage or scaffold for maintenance work by an operator or a passage for an operator on the side of a main body such as an upper swing body. In addition to the side of the main body, a passage or a scaffold may be provided on a mounted device such as a tank, or an inspection scaffold may be provided at the lower part of the main body. These passages and scaffolds may be provided with safety fences for preventing falls or for use as handrails.

  FIG. 6 shows an example of a conventional safety fence mounting structure. In this conventional example, a mounting seat 2 having screw holes 2a, 2a is provided in the safety fence mounting portion of Step 1. On the other hand, the safety fence 3 has a plurality of support columns 3a, and brackets 4 having bolt insertion holes 4a and 4a are welded to the mounting legs 3b at the lower ends thereof. Then, the bracket 4 is applied to the mounting seat 2 provided in step 1, and the mounting bolt 5 is passed through the bolt insertion hole 4a of the bracket 4 and screwed into the screw hole 2a of the mounting seat 2 to be fastened. Is attached to step 1.

  In Patent Document 1, as another structure for connecting the end of the safety fence to the cylindrical column, a male screw is provided at the end of the safety fence, the male screw is inserted into a hole provided in the column, and a nut is attached to the male screw. A structure in which a safety fence is fixed to a support by screwing is disclosed.

  FIG. 7 shows an example of a conventional safety fence mounting structure similar to the mounting structure of Patent Document 1. In FIG. 7, the safety fence 3 has internal threaded portions inside the mounting legs 3c at both ends thereof, and a retaining ring 3d is provided at the top of each mounting leg 3c. The safety fence 3 has its mounting legs 3c and 3c fitted to the cylinders 7 and 7 welded to the step 1, respectively, and the retaining ring 3d at the upper part of the mounting legs 3c and 3c is placed on the cylinder 7 so that the safety fence 3 Is secured to the cylindrical bodies 7 and 7, and the safety fence 3 is attached to the step 1 by screwing and fastening the mounting bolt 8 to the female thread portion of the mounting leg 3c.

Japanese Patent Application Laid-Open No. 8-134756

  In the conventional safety fence mounting structure shown in FIG. 6, when the safety fence 3 is attached to the mounting seat 2 when the working machine is manufactured, one worker supports the safety fence 3 and the bracket 4 is attached to the step 1. It is necessary for other workers to perform the mounting work with the mounting bolts 5 while abutting and holding them. For this reason, two workers are required, and it is difficult to save labor. Further, it is difficult to align the bolt insertion hole 4a of the bracket 4 with the screw hole 2a of the mounting seat 2, and labor is required. Further, when it is necessary to remove the safety fence 3 and attach the safety fence 3 to the step 1 at the site for transportation, the same labor is required, and labor saving is difficult.

  On the other hand, in the case of the conventional structure shown in FIG. 7, if the mounting leg 3 c of the safety fence 3 is inserted into the cylinder 7 welded in advance in step 1, the safety fence 3 is supported by the cylinder 7. For this reason, it is not necessary to support the safety fence 3 when the mounting bolt 8 is attached. For this reason, the operation from the insertion of the safety fence 3 into the cylindrical body 7 to the fixing with the mounting bolt 8 can be performed by one person, and the alignment work is also unnecessary, so that labor can be reduced and labor can be saved. There is an advantage.

  However, in the case of the mounting structure of FIG. 7, the difference between the outer diameter of the mounting leg 3 c at the lower end of the safety fence 3 and the inner diameter of the cylindrical body 7 is reduced in order to attach the safety fence 3 to the step 1 without rattling. . For this reason, in order to be able to insert the mounting legs 3c and 3c into the cylinders 7 and 7, respectively, the difference between the distance L1 between the mounting legs 3c and 3c and the distance L2 between the cylinders 7 and 7 is set minutely. There is a need to. For this reason, at the time of manufacture, the interval L1 between the mounting legs 3c and 3c and the interval L2 of the welding positions of the cylinders 7 and 7 must be set precisely, and the manufacture is not easy.

  Further, when the interval L1 between the mounting legs 3c, 3c of the plurality of safety fences 3 varies, the interval L2 between the cylinders 7, 7 for attaching the safety fences 3 to each safety fence 3 is also set with high accuracy. It is necessary to weld them, and it is no longer easy to manufacture.

  Also, if the distance L1 between the mounting legs 3c, 3c varies, each safety fence 3 can only be attached to a set of cylinders 7 corresponding to the safety fence 3, so the safety fence 3 cannot be shared. . For this reason, when transporting with the safety fences 3 removed and transported to the cylinder 7 at the site, the numbers of the safety fences 3 and the cylinders 7 are indicated respectively. Therefore, it is necessary to attach the safety fence 3 to the cylinder body 7 having the corresponding number, and troublesome management and installation work are required. Furthermore, when a certain safety fence 3 is damaged, when replacing it with a new safety fence 3, it is possible to attach a new safety fence 3 to the existing cylinders 7 and 7 because of the mismatch between the distances L1 and L2. In some cases, it may be necessary to re-weld the cylinder 7 to adjust the distance between the cylinders 7 and 7.

  In view of the above problems, an object of the present invention is to provide a safety fence mounting structure for a work machine that facilitates the production of a safety fence and its mounting portion and can be easily assembled by one person.

The construction structure of the safety fence of the working machine of the present invention is as follows:
In the structure of attaching a safety fence having a plurality of mounting legs to the step used as a scaffold or a passage provided in the main body of the work machine,
Of the plurality of mounting legs, one mounting leg has a threaded portion made of a female screw or a male screw, and a retaining portion is provided on the top of the threaded portion.
Secure the bracket with the bolt insertion hole to the other mounting leg,
In the step, a cylindrical body for inserting a mounting leg having the screw portion and a mounting seat having a screw hole corresponding to a bolt insertion hole of the bracket are provided apart from each other,
A mounting bolt that inserts a mounting leg having the threaded portion into the cylindrical body, places the retaining portion on an upper portion of the cylindrical body, supports the safety fence on the cylindrical body, and is screwed into the female threaded portion. A mounting leg having the threaded portion is fixed to the cylindrical body by a nut screwed into the male threaded portion,
The mounting bolt is loosely fitted into the bolt insertion hole of the bracket, and the mounting leg having the bracket is fixed to the mounting seat by being screwed into and tightened into the screw hole of the mounting seat. To do.

  According to the present invention, the mounting leg having the screw portion is inserted into the cylinder provided in the step, and the retaining portion provided in the mounting leg is placed on the upper part of the cylinder so as to support the safety fence. When installing the safety fence, a worker who only supports the safety fence is not necessary, and one worker can attach the safety fence.

  In addition, the mounting bolt is loosely fitted into the bolt insertion hole of the bracket provided on the other mounting leg, and the mounting bolt is screwed into the screw hole of the mounting seat provided on the step to be fastened. Since the structure is fixed to the mounting seat, the manufacturing tolerance of the distance between the mounting legs of the safety fence can be absorbed by the difference between the inner diameter of the bolt insertion hole provided in the bracket and the outer diameter of the mounting bolt.

  For this reason, if a mounting leg having a threaded portion is inserted into the cylinder, the bolt insertion hole of the bracket of the other mounting leg can be automatically aligned with the screw hole of the mounting seat provided in the step. Labor required for installation work is reduced.

  In addition, since it is not necessary to manufacture with a small tolerance of the distance between the mounting legs of the safety fence, it is not necessary to manufacture the safety fence with a highly accurate distance between the mounting legs. Even if there is some variation in the spacing between the mounting legs of multiple safety fences, the safety fence can be attached to any cylinder or mounting seat that has been previously attached to the step due to the loose fitting structure of the mounting bolts on the bracket. Can be installed. That is, any safety fence can be attached to different cylinders and mounting seat groups, and the safety fence can be shared.

  For this reason, even when removing or assembling the safety fence from the step repeatedly, there is no need to manage the number of the safety fences, cylinders and mounting seats, and to specify the installation position. And assembly is facilitated. In addition, since the safety fence can be shared, if the safety fence needs to be replaced, a new safety fence can be installed using the existing cylinder or mounting seat. There is no need to put it on again.

It is a side view which shows an example of the working machine which shows one Embodiment of the attachment structure of the safety fence of this invention. It is a top view of the main body of this embodiment. It is a disassembled perspective view which shows the attachment structure of the safety fence of this embodiment. It is sectional drawing which shows the attachment structure of the attachment leg which has a thread part of this embodiment. It is sectional drawing which shows other embodiment of this invention. It is a disassembled perspective view which shows an example of the attachment structure of the conventional safety fence. It is a disassembled perspective view which shows the other example of the attachment structure of the conventional safety fence.

  FIG. 1 is a side view showing an example of a working machine showing an embodiment of a safety fence mounting structure according to the present invention. In this example, the working machine is a hydraulic excavator. In this excavator, a swing frame 13a of an upper swing body (main body) 13 is installed on a lower traveling body 11 via a swing device 12, and a power unit 14, a cab 15 and a counterweight 16 are mounted on the swing frame 13a. Thus, the upper swing body 13 is configured, and a multi-joint work front 17 is attached to the swing frame 13a.

  The work front 17 includes a boom 18 that can be mounted on the revolving frame 13 a by a boom cylinder 18 a, an arm 19 that can be pivoted by an arm cylinder 19 a at the tip of the boom 18, and a bucket cylinder 20 at the tip of the arm 19. And a bucket 21 that is pivotably attached to the vehicle. The power unit 14 normally uses an engine as a prime mover, but may use an electric motor driven by an external power source or an on-board power source.

  A non-expandable or telescopic boom can be used for the work front 17, and a work machine suitable for the purpose can be provided by attaching work tools for various purposes such as dismantling, cargo handling, crushing, etc. as work tools. Can be configured.

  FIG. 2 is a plan view of the upper swing body 13. In FIG. 2, 14 a is a fuel tank, 14 b is a hydraulic oil tank, 14 c is a power source including an engine, a hydraulic pump, various cooling devices, and the like, and these constitute a power unit 14. As shown in FIGS. 1 and 2, a plurality of steps 22 serving as scaffolds and passages for operators and maintenance personnel are attached to both sides of the turning frame 13a. A safety fence 23 is attached to the outside of the step 22.

  FIG. 3 is an exploded perspective view showing an embodiment of the mounting structure of the safety fence 23 according to the present invention. The safety fence 23 according to this embodiment includes left and right support portions 23a and 23a, one or more horizontal frame portions 23b, attachment legs 23c and 23d provided at the lower end of the support portion 23a, and one attachment leg 23c. And a bracket 24 fixed to the other mounting leg 23d by welding or the like. The bracket 24 is provided with a bolt insertion hole 24a into which the mounting bolt 25 is loosely fitted. As shown in FIG. 4, one mounting leg 23c is configured by providing a female screw portion 23f therein.

  As shown in FIG. 3, a cylindrical body 26 into which the mounting leg 23c having the female threaded portion 23f is inserted and a mounting seat 27 are spaced from each other on the outer surface of the step 22 by bolting or welding as shown. Provide with. The mounting seat 27 is provided with a screw hole 27 a corresponding to the bolt insertion hole 24 a of the bracket 24. Therefore, the interval between the mounting positions of the cylindrical body 26 and the mounting seat 27 is such that the distance L3 between the shaft center of the mounting leg 23c and the bolt insertion hole 24a of the bracket 24 is the screw hole of the cylindrical body 26 and the mounting seat 27. It is set to be equal to the interval L4 with respect to 27a.

  In this embodiment, the safety fence 23 is attached to the step 22 by first inserting the mounting leg 23c having the female screw portion 23f into the cylindrical body 26 and placing the retaining portion 23e on the upper portion of the cylindrical body 26. 23 is supported by the cylindrical body 26.

  In this way, one side of the safety fence 23 is supported by the cylindrical body 26, the mounting bolt 25 is passed through the washer 28, and further loosely fitted into the bolt insertion hole 24 a of the bracket 24, and the screw hole 27 a of the mounting seat 27. The mounting leg 23d having the bracket 24 is fixed to the mounting seat 27 by being screwed to and fastened.

  Further, the mounting bolt 29 is passed through the washer 30, and the mounting bolt 29 is screwed into the female screw portion 23f of the mounting leg 23c and fastened to fix the mounting leg 23c to the cylindrical body 26. As shown in FIG. 4, since the length H1 of the cylindrical body 26 is set to be slightly longer than the length H2 of the mounting leg 23c, if the mounting bolt 29 is screwed into the female thread portion 23f and fastened, the mounting bolt 29 Since the head of this is pressed against the lower surface of the cylindrical body 26 via the washer 30, the safety fence 23 can be firmly fixed to the cylindrical body 26 with high restraining force without rattling.

  Thus, according to this embodiment, the mounting leg 23c having the female screw portion 23f is inserted into the cylindrical body 26 provided at the step 22, and the retaining portion 23e provided at the upper portion of the mounting leg 23c is provided as the cylindrical body. Since the safety fence 23 is supported by being placed on the upper part of 26, a worker who only supports the safety fence 23 is not necessary, and the installation of the safety fence 23 can be performed by one worker. Labor saving is possible.

  Further, the mounting bolt 25 is loosely fitted in the bolt insertion hole (so-called fool hole) 24a of the bracket 24 provided in the other mounting leg 23d, and is screwed into the screw hole 27a of the mounting seat 27 provided in the step 22 for fastening. Thus, since the mounting leg 23d having the bracket 24 is fixed to the mounting seat 27, the mounting of the safety fence 23 is caused by the difference between the inner diameter of the bolt insertion hole 24a provided in the bracket 24 and the outer diameter of the mounting bolt 25. The manufacturing tolerance of the distance between the legs 23c and 23d can be absorbed.

  Note that the difference between the inner diameter of the bolt insertion hole 24a and the outer diameter of the mounting bolt 25 is preferably increased as the distance between the mounting legs 23c and 23d is increased. In general, the outer diameter of the mounting bolt 25 is 12 mm, for example. In this case, the inner diameter of the bolt insertion hole 24a is, for example, about 16 mm.

  As described above, the variation in the distance between the mounting legs 23c and 23d is absorbed by the difference between the inner diameter of the bolt insertion hole 24a and the outer diameter of the mounting bolt 25. Therefore, the mounting leg 23c having the threaded portion is attached to the cylindrical body 26. The bolt insertion hole 24a of the bracket 24 of the other mounting leg 23d can be automatically aligned with the screw hole 27a of the mounting seat 27 provided in the step 22, and labor required for mounting the safety fence 23 Is reduced.

  Further, since the variation in the distance between the mounting legs 23c and 23d is absorbed by the difference between the inner diameter of the bolt insertion hole 24a and the outer diameter of the mounting bolt 25, the distance between the mounting legs 23c and 23d of the safety fence 23 is increased. It is not necessary to set with accuracy, and manufacturing is easy. In addition, even if there is some variation in the spacing between the mounting legs 23c and 23d of the plurality of safety fences 23, there is compatibility with any set of cylinders 26 and mounting seats 27 that are attached in advance to the step. Thus, the safety fence 23 can be attached. That is, any safety fence 23 can be attached to a set of different cylinders 26 and mounting seats 27, and the safety fence 23 can be shared.

  For this reason, there is no need to manage the numbers of the plurality of safety fences 23 and the cylinders 26 and the mounting seats 27 and to specify the installation positions. In the machine, the safety fence 23 can be easily managed and assembled. Further, since the safety fence 23 can be shared, when the safety fence 23 needs to be replaced, a new safety fence 23 can be attached using the existing cylinder body 26 or the mounting seat 27. Adjustment of the attachment position of the body 26 and the attachment seat 27 is also unnecessary.

  FIG. 5 is a cross-sectional view showing another embodiment of the present invention. In the safety fence 23, a mounting leg 23h having a male screw portion is provided in place of the mounting leg 23c having the female screw portion 23f. . In this embodiment, a nut 32 is screwed into a portion protruding downward from the cylindrical body 26 of the mounting leg 23h provided with the male screw portion via a washer 31, and fastened. Also in this embodiment, since the retaining portion 23e can be mounted on the upper portion of the cylindrical body 26 in the same manner as described above, the mounting work can be performed, so that the same effect as the embodiment shown in FIGS. 3 and 4 can be obtained. I can give you.

  When carrying out the present invention, the bolt insertion hole 24a provided in the bracket 24 may be a horizontally long long hole instead of a fool hole. The present invention can also be applied to a safety fence having three or more mounting legs. For example, in the case of a safety fence having three mounting legs, any one mounting leg is set as a mounting leg having a threaded portion. In this case, the central mounting leg is a mounting leg having a threaded portion, and the other mounting leg is a mounting leg having the bracket 24. The inner diameter of the bolt insertion hole 24a of the bracket 24 and the outer diameter of the mounting bolt 25 are the same. This is preferable because the difference between them is small.

  The present invention can also be applied to a case where the main body to which the step is attached is configured to be non-rotating.

DESCRIPTION OF SYMBOLS 11: Lower traveling body, 12: Turning apparatus, 13: Upper turning body (main body), 13a: Turning frame, 14: Power unit, 15: Driver's cab, 16: Counterweight, 17: Work front of multi-joint structure, 22 : Step, 23: Safety fence, 23a: Strut part, 23b: Horizontal frame part, 23c, 23d, 23h: Mounting leg, 23e: Retaining part, 23f: Female thread part, 24: Bracket, 24a: Bolt insertion hole, 25 : Mounting bolt, 26: cylinder, 27: mounting seat, 27: screw hole, 28: washer, 29: mounting bolt, 30, 31: washer, 32: nut

Claims (1)

In the structure of attaching a safety fence having a plurality of mounting legs to the step used as a scaffold or a passage provided in the main body of the work machine,
Of the plurality of mounting legs, one mounting leg has a threaded portion made of a female screw or a male screw, and a retaining portion is provided on the top of the threaded portion.
Secure the bracket with the bolt insertion hole to the other mounting leg,
In the step, a cylindrical body for inserting a mounting leg having the screw portion and a mounting seat having a screw hole corresponding to a bolt insertion hole of the bracket are provided apart from each other,
A mounting bolt that inserts a mounting leg having the threaded portion into the cylindrical body, places the retaining portion on an upper portion of the cylindrical body, supports the safety fence on the cylindrical body, and is screwed into the female threaded portion. A mounting leg having the threaded portion is fixed to the cylindrical body by a nut screwed into the male threaded portion,
The mounting bolt is loosely fitted into the bolt insertion hole of the bracket, and the mounting leg having the bracket is fixed to the mounting seat by being screwed into and tightened into the screw hole of the mounting seat. The installation structure of the safety fence of the working machine.

Images