Construction machine

Abstract

To prevent damage to a columnar body and a protection member by dissipating an impact when a columnar body collides with a protection member and by preventing a columnar body from rubbing against a protection member.SOLUTION: A protection member 11 erected at a right front position of a rotating frame 5 and protecting an outer cover 10 from logs as column-shaped bodies comprises: a post portion 14 disposed outside the outer cover 10 in a radial direction with a rotation center O of an upper rotating body 3 as the center and extending upward from a periphery of the rotating frame 5; and a rotating cylinder portion 15 consisting of a cylindrical body covering an outer periphery side of the post portion 14 and rotatably provided around the post portion 14.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to construction machinery such as a hydraulic excavator that is equipped with a grapple or harvester for gripping cylindrical objects such as felled logs. [Background technology]

[0002] Generally, a hydraulic excavator, which is a representative example of a construction machine, is composed of a self-propelled lower running body, an upper rotating body that is rotatably mounted on the lower running body, and a working device provided on the front side of the upper rotating body.

[0003] The upper rotating body includes a rotating frame that forms a support structure, a driver's seat provided on the left side of the rotating frame, and an exterior cover provided on the right side of the rotating frame for covering the on-board equipment such as the prime mover mounted on the rotating frame. The working mechanism of a standard hydraulic excavator is provided with a bucket as an excavation attachment, and excavation work of earth and sand is performed with this bucket.

[0004] Hydraulic excavators are also used in forestry work sites by mounting forestry attachments such as grapples, harvesters, and processors instead of the buckets of the working equipment. At these forestry work sites, felled long logs are gripped by the forestry attachments and processed by loading them onto transport vehicles (trucks, etc.) and pruning them. In this case, if the working equipment is operated while a long columnar log is gripped by a grapple or the like, there is a risk that the log will come into contact with the exterior cover of the upper rotating body.

[0005] For this reason, the operator needs to operate the working equipment carefully so as not to bring the logs into contact with the exterior cover, etc., which may result in poor work efficiency. Therefore, some hydraulic excavators used in forestry and other fields are equipped with a protective member that protects the exterior cover from the logs that are columnar bodies (Patent Document 1).

[0006] The protective member of Patent Document 1 is erected at the right front position of the revolving frame so as to protect the right front position of the exterior cover, which is difficult for the operator sitting in the driver's seat to see. The protective member also includes a rod-shaped body extending upward, and a cover member made of an elastic rubber material or a polymeric material such as polycarbonate, which covers the outer periphery of the rod-shaped body. This makes it possible to prevent damage to the exterior cover and the log by the elastic force of the cover member, even if the log collides with the protective member. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2020-41310 A Summary of the Invention [Problem to be solved by the invention]

[0008] The protective member of Patent Document 1 is made of a polymeric material, and therefore has a problem of higher manufacturing costs compared to when it is made of an iron material. In addition, the protective member of Patent Document 1 is designed to mitigate the impact when a log collides with it by giving elasticity to the cover member. However, depending on the angle and force with which the log collides with the protective member, there is a risk that the commercial log or the protective member may be damaged. Moreover, the log may be damaged even if it is only rubbed against the protective member.

[0009] The present invention has been made in consideration of the problems with the conventional technology described above, and an object of the present invention is to provide a construction machine that can prevent damage to the pillar-shaped body and the protective member by dissipating the impact when the pillar-shaped body collides with the protective member and preventing the pillar-shaped body from rubbing against the protective member. [Means for solving the problem]

[0010] The construction machine according to the present invention comprises a self-propelled lower running body, an upper rotating body rotatably mounted on the lower running body, and a working device provided on the front side of the upper rotating body and equipped with a work tool for gripping a columnar body, wherein the upper rotating body comprises a rotating frame forming a support structure, a driver's seat provided on the left side of the rotating frame, an exterior cover provided on the right side of the rotating frame and covering the equipment mounted on the rotating frame, and a protective member erected at the right front position of the rotating frame and protecting the exterior cover from the columnar body.In this construction machine, the protective member is positioned outer than the exterior cover in the radial direction centered on the center of rotation of the upper rotating body, and comprises a support portion extending upward from around the rotating frame, and a rotating tube portion consisting of a cylindrical body covering the outer circumferential side of the support portion and rotatably mounted around the support portion. Effect of the Invention

[0011] According to the present invention, it is possible to dissipate the impact when the columnar body collides with the protective member, and it is also possible to prevent the columnar body from rubbing against the protective member, thereby preventing damage to the columnar body and the protective member. [Brief description of the drawings]

[0012] [Figure 1] 1 is a right side view showing a hydraulic excavator equipped with a protective member according to a first embodiment of the present invention. [Diagram 2] 4 is a plan view showing the front portion of the upper rotating body and the protective member. FIG. [Diagram 3] 4 is a perspective view showing the upper rotating body and the protective member from the right front side. FIG. [Figure 4] FIG. 4 is a perspective view showing a mounting seat of the revolving frame. [Diagram 5] FIG. 2 is a perspective view showing a protective member according to the first embodiment. [Figure 6] 6 is a perspective view showing a mounting portion, a support portion and a cover portion of the protective member of FIG. 5. FIG. [Figure 7] FIG. 6 is a cross-sectional view of the protective member of FIG. 5. [Figure 8]FIG. 4 is a perspective view showing a protective member according to a second embodiment of the present invention. [Figure 9] 9 is a perspective view showing an attachment portion and a support portion of the protective member of FIG. 8. FIG. [Figure 10] 9 is a cross-sectional view of the protective member of FIG. 8. [Figure 11] FIG. 11 is a perspective view showing a protective member according to a third embodiment of the present invention. [Figure 12] 12 is a perspective view showing a mounting portion, a support portion and a cover portion of the protective member shown in FIG. 11. [Figure 13] 12 is a cross-sectional view of the protective member of FIG. 11. [Figure 14] FIG. 11 is a perspective view showing a protective member according to a fourth embodiment of the present invention. [Figure 15] 11 is a perspective view showing the protective member with the split tube portions separated from each other; FIG. [Figure 16] FIG. 11 is a perspective view showing another protective member and an upper rotating body according to a first modified example of the present invention, viewed from the left front side. [Figure 17] FIG. 11 is a cross-sectional view showing a protective member according to a second modified example of the present invention. [Figure 18] FIG. 11 is a cross-sectional view showing a protective member according to a third modified example of the present invention. [Figure 19] FIG. 11 is a cross-sectional view showing a protective member according to a fourth modified example of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will now be described in detail with reference to the accompanying drawings, taking as an example a case in which the present invention is applied to a hydraulic excavator as a representative example of a construction machine.

[0014] 1 to 7 show a first embodiment of the present invention. In FIG. 1, a hydraulic excavator 1 is of forestry specifications. Specifically, the hydraulic excavator 1 of forestry specifications is used for various tasks such as uprooting to dig up tree roots, leveling to prepare forest roads, felling to cut down trees, delimbing to remove branches from felled trees, cutting felled trees to a specified length (bucking), collecting felled trees in a forest, sorting and loading to select and line up the cut logs and load them onto a truck, etc. In this embodiment, a grapple 4C is equipped on a working device 4 described later to grip and move logs (columnar bodies) cut from felled trees.

[0015] The hydraulic excavator 1 is composed of a self-propelled crawler-type lower running body 2, an upper rotating body 3 rotatably mounted on the lower running body 2, and a working device 4 rotatably provided on the front side of the upper rotating body 3.

[0016] The working device 4 includes a boom 4A whose base end is rotatably connected to the rotating frame 5, an arm 4B rotatably connected to the tip end of the boom 4A, a grapple 4C as a working tool rotatably connected to the tip end of the arm 4B, and a boom cylinder 4D, an arm cylinder 4E, and a working tool cylinder 4F for rotating these.

[0017] The grapple 4C is configured to be rotatable (rotatable on its own axis) by a hydraulic actuator (not shown). The grapple 4C can grip logs (not shown) that are cut to a predetermined length to become columnar bodies. The working device 4 can also be equipped with a harvester that continuously performs felling, branching, and cutting, a processor that continuously performs branching and cutting, etc. as a working tool.

[0018] The upper rotating body 3 comprises a rotating frame 5 which forms a supporting structure, a driver's seat 6 provided on the left side of the rotating frame 5, a cab 7 provided on the left side of the rotating frame 5 so as to cover the driver's seat 6, a hydraulic oil tank 8 provided on the right side of the rotating frame 5 for storing hydraulic oil to be supplied to the hydraulic actuators, and a fuel tank 9 provided adjacent to the right side of the hydraulic oil tank 8 for storing fuel.

[0019] Equipment such as an engine, a prime mover such as an electric motor, a hydraulic pump, a heat exchanger, etc. (none of which are shown) are mounted on the rear side of the revolving frame 5. The equipment mounted on the revolving frame 5 is covered by an exterior cover 10 provided on the revolving frame 5.

[0020] 1 to 3, the revolving frame 5 has a center frame 5A extending in the front-rear direction, and a left side frame (not shown) and a right side frame 5B that are disposed on either side of the center frame 5A and extend in the front-rear direction. The front right side of the revolving frame 5 is a horizontal frame portion 5C that extends leftward from the front portion of the right side frame 5B toward the center frame 5A. Furthermore, the connection portion (right front corner) between the right side frame 5B and the horizontal frame portion 5C is an inclined frame portion 5D that is inclined so as to be chamfered.

[0021] As shown in Fig. 4, the inclined frame part 5D at the right front position is provided with a mounting seat 5E for mounting a protective member 11 described later. The mounting seat 5E is made of, for example, two metal plates having two screw holes 5E1 in the vertical direction, and is fixed to the inclined frame part 5D by welding or other means while being arranged side by side. A bolt 13 for mounting a mounting part 12 of the protective member 11 described later is screwed into each screw hole 5E1.

[0022] Located in front of the driver's seat 6 where the operator sits, inside the cab 7, there is provided a travel operation lever and pedal device (not shown) for traveling the hydraulic excavator 1. In addition, on both the left and right sides of the driver's seat 6, there are provided work operation lever devices (not shown) for operating the work equipment 4 and the like.

[0023] As shown in Fig. 2, the hydraulic oil tank 8 is provided on the revolving frame 5, located on the right side of the cab 7 with the work implement 4 in between. The hydraulic oil tank 8 stores hydraulic oil for driving the hydraulic actuator. In addition, the fuel tank 9 is provided on the revolving frame 5, aligned to the right of the hydraulic oil tank 8. The fuel tank 9 stores fuel to be supplied to the engine.

[0024] The exterior cover 10 covers the prime mover, hydraulic pump, etc. behind the cab 7, and covers the control valve (not shown) etc. in front of the hydraulic oil tank 8 and fuel tank 9. The exterior cover 10 is provided on the right side of the revolving frame 5, and has a right front cover part 10A that covers the control valve (mounted equipment) mounted on the revolving frame 5.

[0025] Next, the configuration and function (operation) of the protective member 11, which is a characteristic part of this embodiment, will be described.

[0026] The protective member 11 is erected at the right front position of the revolving frame 5. In this way, the protective member 11 protects the exterior cover 10 from, for example, logs made of long columnar bodies. The protective member 11 is configured to include a mounting portion 12, a support portion 14, a rotating cylinder portion 15, and a cover portion 16, which will be described later. Here, the protective member 11 is formed using an iron material, and can be manufactured at low cost.

[0027] The mounting portion 12 includes a vertical plate 12A facing the mounting seat 5E of the swivel frame 5, a horizontal plate 12B bending and extending from the upper portion of the vertical plate 12A, and a reinforcing plate 12C provided between the front surface of the vertical plate 12A and the lower surface of the horizontal plate 12B. Furthermore, the vertical plate 12A is formed with four bolt insertion holes 12D (see FIG. 7) at positions corresponding to the screw holes 5E1 of the mounting seat 5E.

[0028] When mounting part 12 is attached to revolving frame 5, vertical plate 12A is faced to mounting seat 5E of revolving frame 5, and in this state, bolt 13 inserted through bolt insertion hole 12D is screwed into screw hole 5E1 of mounting seat 5E. This allows mounting part 12 to be attached to the right front position of revolving frame 5. Furthermore, with mounting part 12 attached to mounting seat 5E of revolving frame 5, horizontal plate 12B is in a horizontal position.

[0029] The support column 14 is provided on the horizontal plate 12B of the mounting portion 12. As shown in FIG. 2, the support column 14 is disposed outside the exterior cover 10 in the radial direction centered on the rotation center O of the upper rotating body 3, specifically, outside a circle C centered on the rotation center O and tangent to the right front part of the right front cover portion 10A. In addition, the support column 14 extends upward from the periphery of the rotating frame 5. In other words, the support column 14 is disposed at a position where it can prevent the log gripped by the grapple 4C from colliding with the right front cover portion 10A, whether the log approaches the right front cover portion 10A from the front side or from the right side.

[0030] As shown in Fig. 7, the support pillar 14 is formed as a cylinder having a certain diameter. The lower end of the support pillar 14 is fixed to the upper surface of the horizontal plate 12B by, for example, welding. This allows the support pillar 14 to be lightweight while still providing strength. The support pillar 14 (protective member 11) has a height equivalent to that of the right front cover part 10A that it is intended to protect (see Fig. 1).

[0031] The rotating cylinder 15 is formed as a cylinder that covers the outer periphery of the support 14. The rotating cylinder 15 is provided rotatably around the support 14. Specifically, the rotating cylinder 15 is a cylinder with both ends in the axial direction (vertical direction) open, and its inner diameter is set to be slightly larger than the outer diameter of the support 14. As a result, a gap is formed between the rotating cylinder 15 and the support 14, so that the rotating cylinder 15 can rotate around the support 14. The rotation of the rotating cylinder 15 can deflect the log that has collided with the rotating cylinder 15 (the impact at the time of the collision) in a direction different from the central axis, and can prevent the log from rubbing. As a result, the rotation of the rotating cylinder 15 can prevent damage to the protective member 11 and the log.

[0032] The cover part 16 is provided on the upper part of the support part 14. The cover part 16 is formed as a disk body having a diameter dimension equal to the outer diameter dimension of the rotating cylinder part 15. The cover part 16 is attached to the upper part of the support part 14 by means of welding, screwing, pinning, or the like. The cover part 16 covers the gap between the support part 14 and the rotating cylinder part 15, and prevents soil, sand, and wood chips from entering the gap, thereby preventing the rotating cylinder part 15 from rotating poorly. The cover part 16 can also prevent the rotating cylinder part 15 from bouncing up and down significantly during travel or work, which could result in damage.

[0033] The hydraulic excavator 1 according to the first embodiment has the configuration described above, and next, an example of its operation will be described.

[0034] The operator sitting in the driver's seat 6 in the cab 7 can operate the travel control lever and pedal device to drive the lower travel unit 2 to the work site. Once at the work site, the operator can operate the work control lever device to rotate the upper rotating unit 3 and turn the work device 4 to move the log gripped by the grapple 4C.

[0035] Here, when moving the log gripped by the grapple 4C, since the log is long, there is a risk that the log will collide with the exterior cover 10 if the operation is incorrect. In particular, the right front position of the upper rotating body 3 is on the opposite side of the driver's seat 6 in the left-right direction, and is difficult to see from the operator sitting in the driver's seat 6. For this reason, there is a risk that the log will collide with the right front cover part 10A of the exterior cover 10, which requires careful operation and reduces workability.

[0036] Therefore, a protective member 11 for protecting the exterior cover 10 is provided at the right front position of the revolving frame 5. As a result, even if a log is about to collide with the right front cover portion 10A of the exterior cover 10, the log will collide with the protective member 11 before colliding with the right front cover portion 10A, thereby preventing damage to the right front cover portion 10A.

[0037] However, there is a risk that the protective member 11 and the logs to be sold may be damaged depending on the angle and force (magnitude of impact) when the logs collide with the protective member 11. In addition, since the logs are made of wood, even just rubbing against the protective member 11 can cause damage, resulting in a decrease in their commercial value.

[0038] However, in the first embodiment, the protective member 11, which is erected at the right front position of the rotating frame 5 and protects the exterior cover 10 from the logs as column-shaped bodies, is positioned outer than the exterior cover 10 in the radial direction centered on the rotation center O of the upper rotating body 3, and is equipped with a support portion 14 extending upward from the periphery of the rotating frame 5, and a rotating cylinder portion 15 consisting of a cylindrical body covering the outer periphery of the support portion 14 and rotatably arranged around the support portion 14.

[0039] Therefore, even if a log collides with the rotating cylinder part 15, the rotating cylinder part 15 rotates, so that the impact of the collision can be deflected in another direction from the center (axis) of the protective member 11 and dissipated. Also, because the rotating cylinder part 15 rotates in response to the contact of the log, it is possible to prevent the log from rubbing against it. As a result, the protective member 11 can prevent damage to the protective member 11 and the log.

[0040] The rotating cylinder 15 is formed of a cylinder with both axial ends open. A cover 16 is provided on the upper part of the support 14 to cover the gap between the support 14 and the rotating cylinder 15. This allows the cover 16 to prevent soil and wood chips from entering the gap between the support 14 and the rotating cylinder 15, preventing malfunction of the rotating cylinder 15. Furthermore, the cover 16 also prevents the rotating cylinder 15 from bouncing up and down significantly during travel or work, resulting in damage to the rotating cylinder 15.

[0041] Next, Figures 8 to 10 show a second embodiment of the present invention. The second embodiment is characterized in that the rotating tube is formed as a covered cylinder whose upper end is closed with a lid. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

[0042] 8, the protective member 21 according to the second embodiment is erected at the right front position of the revolving frame 5, similar to the protective member 11 according to the first embodiment. The protective member 21 is composed of the mounting portion 12 and the support portion 14 (see FIG. 9) according to the first embodiment described above, and a rotating cylinder portion 22 described below.

[0043] The rotating cylinder part 22 according to the second embodiment, like the rotating cylinder part 15 according to the first embodiment, is made of a cylinder that covers the outer periphery of the support part 14 and is provided rotatably around the support part 14. However, the rotating cylinder part 22 according to the second embodiment differs from the rotating cylinder part 15 according to the first embodiment in that the rotating cylinder part 22 according to the second embodiment is formed as a covered cylinder whose upper end is closed by a cover body 22B as shown in Fig. 10.

[0044] The rotating cylinder 22 is formed of a cylindrical body 22A extending in the axial direction (vertical direction) and a lid 22B closing the upper end of the body 22A. The inner diameter of the body 22A is set to be slightly larger than the outer diameter of the support 14. The lower surface of the lid 22B abuts against the upper end surface of the body 22A. As a result, a gap is formed between the body 22A and the support 14, so that the rotating cylinder 22 can rotate around the support 14 while the lid 22B is in sliding contact with the upper end of the support 14.

[0045] Thus, the protective member 21 according to the second embodiment configured as described above can also provide the same actions and effects as those of the first embodiment. In particular, since the rotating cylinder portion 22 of the protective member 21 according to the second embodiment is formed by the cylinder body 22A and the lid body 22B, the lid body 22B can more reliably prevent soil and wood chips from entering the gap between the support portion 14 and the rotating cylinder portion 22.

[0046] Next, Figures 11 to 13 show a third embodiment of the present invention. The third embodiment is characterized in that the rotating cylinder is formed of multiple cylinders divided in the vertical direction. In the third embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

[0047] 11, the protective member 31 is erected at the right front position of the revolving frame 5, similar to the protective member 11 according to the first embodiment. The protective member 31 is composed of the mounting portion 12 and cover portion 16 according to the first embodiment described above, and a support portion 32, a lower rotating cylinder portion 33, an intermediate rotating cylinder portion 34, and an upper rotating cylinder portion 35, which will be described later.

[0048] As shown in Fig. 12, the support column 32 according to the third embodiment is provided on the horizontal plate 12B of the mounting portion 12, similar to the support column 14 according to the first embodiment. The support column 32 is composed of a lower large diameter portion 32A, a middle diameter portion 32B, and an upper small diameter portion 32C, which are arranged in the vertical direction with the same length dimension. The support column 32 has a first step portion 32D between the large diameter portion 32A and the middle diameter portion 32B, and a second step portion 32E between the middle diameter portion 32B and the small diameter portion 32C. The lower end portion of the large diameter portion 32A of the support column 32 is fixed to the upper surface of the horizontal plate 12B by, for example, welding means.

[0049] 13, the lower rotating cylinder portion 33 as the rotating cylinder portion is made of a cylinder body that covers the outer periphery of the large diameter portion 32A of the support portion 32, and is rotatably provided on the horizontal plate 12B of the mounting portion 12. The lower rotating cylinder portion 33 is set to a dimension slightly shorter than the length dimension (vertical dimension) of the large diameter portion 32A.

[0050] The intermediate rotating cylinder portion 34 serving as the rotating cylinder portion is made of a cylinder that covers the outer circumferential side of the medium diameter portion 32B of the support portion 32, and is rotatably provided on the first step portion 32D of the support portion 32. The intermediate rotating cylinder portion 34 is set to a dimension slightly shorter than the length dimension of the medium diameter portion 32B.

[0051] Furthermore, the upper rotating cylinder portion 35 as the rotating cylinder portion is made of a cylinder body that covers the outer periphery of the small diameter portion 32C of the support portion 32, and is rotatably provided on the second step portion 32E of the support portion 32. The upper rotating cylinder portion 35 is set to a dimension slightly shorter than the length dimension of the small diameter portion 32C.

[0052] Thus, the protective member 31 according to the third embodiment configured as described above can also provide the same actions and effects as those of the first embodiment. In particular, the protective member 31 according to the third embodiment has a rotating cylinder portion divided in the vertical direction into a lower rotating cylinder portion 33, an intermediate rotating cylinder portion 34, and an upper rotating cylinder portion 35. This reduces the weight of the rotating parts and improves the rotational operability. In addition, the replacement cost in the event of damage can be reduced.

[0053] Next, Figures 14 and 15 show a fourth embodiment of the present invention. The fourth embodiment is characterized in that the rotating cylinder is formed as a cylinder by connecting a plurality of arc-shaped curved plates in the circumferential direction. In the fourth embodiment, the same components as those in the first embodiment are given the same reference numerals, and the description thereof will be omitted.

[0054] 14, a protective member 41 according to the fourth embodiment is erected at the right front position of a revolving frame 5, similar to the protective member 11 according to the first embodiment. The protective member 41 is composed of the mounting portion 12 and the support portion 14 (see FIG. 15) according to the first embodiment described above, and a rotating cylinder portion 42 described later.

[0055] The rotating cylinder portion 42 according to the fourth embodiment, like the rotating cylinder portion 15 according to the first embodiment, is made of a cylinder that covers the outer periphery of the support portion 14 and is provided rotatably around the support portion 14. However, the rotating cylinder portion 22 according to the fourth embodiment differs from the rotating cylinder portion 15 according to the first embodiment in that, as shown in Fig. 15, the rotating cylinder portion 22 according to the fourth embodiment is formed as a cylinder by two arc plates 42A that are curved in an arc shape.

[0056] The rotating cylinder 42 is formed by using two semi-cylindrical arc plates 42A obtained by dividing a cylinder by a dividing line extending in the axial direction (vertical direction). Specifically, the arc plate 42A has a convex portion 42A1 formed on one side in the circumferential direction (curving direction), and a concave portion 42A2 into which the convex portion 42A1 fits formed on the other side. The rotating cylinder 42 can form a cylinder that covers the outer periphery of the support portion 14 by sandwiching the support portion 14 between the two arc plates 42A, fitting each of the convex portions 42A1 into the concave portion 42A2, and fixing them by welding or the like. This can prevent the two arc plates 42A from being displaced or separated, and can improve durability.

[0057] Thus, the protective member 41 according to the fourth embodiment configured as described above can achieve the same effects and advantages as those of the first embodiment. In particular, the rotating cylinder portion 42 of the protective member 41 according to the fourth embodiment is configured to be formed as a cylinder by connecting two arc-shaped curved arc plates 42A in the circumferential direction. This makes it easy to replace the rotating cylinder portion 42.

[0058] Next, Fig. 16 shows a fifth embodiment of the present invention. The fifth embodiment is characterized in that another protective member is provided at the left front position of the revolving frame to protect the front portion of the driver's seat from the pillar-shaped body. In the fifth embodiment, the same components as those in the first embodiment described above are given the same reference numerals, and the description thereof will be omitted.

[0059] 16, the other protective member 51 according to the fifth embodiment is composed of a mounting portion 12, a support portion 14, a rotating cylinder portion 15, and a cover portion 16, similar to the protective member 11 according to the first embodiment. However, the other protective member 51 according to the fifth embodiment is provided at the left front position of the revolving frame 5. This allows the other protective member 51 to protect the front portion of the driver's seat 6, i.e., the front portion of the cab 7, from logs.

[0060] Thus, even in the fifth embodiment configured as described above, the same action and effect as in the first embodiment can be obtained by the protective member 11. Moreover, in the fifth embodiment, since another protective member 51 is provided at the left front position of the revolving frame 5, the front portion of the cab 7 can be protected from logs.

[0061] In the second embodiment, the support 14 of the protective member 21 is formed as a cylinder having a certain diameter. However, the present invention is not limited to this, and may be configured as a protective member 61 according to a first modified example shown in FIG. 17. That is, the support 62 of the protective member 61 may be configured such that the upper end is reduced in diameter to form a tapered portion 62A, and the cover 22B of the rotating cylinder 22 is brought into sliding contact with this tapered portion 62A. With this configuration, the frictional resistance between the support 62 and the rotating cylinder 22 can be reduced.

[0062] Also, it may be configured as a protective member 71 according to a third modification shown in Fig. 18. In this protective member 71, the upper end of the support part 72 is reduced in diameter to form a tapered part 72A, and a tapered cylinder 73C is provided along the tapered part 72A between the cylinder 73A and the cover 73B of the rotating cylinder part 73. According to this third modification, the corners of the rotating cylinder part 73 can be made obtuse, and damage to the columnar body can be suppressed.

[0063] On the other hand, in the fourth embodiment, the rotating cylinder portion 42 is formed as a cylinder by connecting two arc-shaped curved arc plates 42A in the circumferential direction. However, the present invention is not limited to this, and may be configured as a protection member 81 according to a fourth modified example shown in FIG.

[0064] That is, the protective member 81 is composed of a support column 82 having a support flange 82A at the vertical middle, a lower rotating cylinder 83 provided between the mounting portion 12 and the support flange 82A and formed as a cylindrical body by connecting two arc plates 83A curved in an arc shape in the circumferential direction, and an upper rotating cylinder 84 provided between the support flange 82A and the cover portion 16 and formed as a cylindrical body by connecting two arc plates 84A curved in an arc shape in the circumferential direction. This configuration reduces the weight of the rotating portion and improves the rotational operability. In addition, the replacement cost when damaged can be reduced. [Explanation of symbols]

[0065] 1. Hydraulic excavator (construction machinery) 2 Undercarriage 3. Upper rotating body 4 Work equipment 4C Grapple (Working tool) 5 Swivel Frame 6 Driver's seat 10 Exterior cover 10A Right front cover 11,21,31,41,61,71,81 Protective materials 14,32,62,72,82 Support section 15,22,42,73 Rotating cylinder 16 Cover part 22A,73A cylinder 22B,73B Lid body 33,83 Lower rotating cylinder part (rotating cylinder part) 34 Intermediate rotating cylinder section (rotating cylinder section) 35,84 Upper rotating cylinder part (rotating cylinder part) 42A, 83A, 84A Arc plate 51 Other protective materials O Turning center

Claims

1. The construction machine comprises a self-propelled lower traveling body, an upper rotating body rotatably mounted on the lower traveling body, and a working device provided on the front side of the upper rotating body and equipped with a working tool for gripping a columnar body, The upper rotating body is a pivoting frame forming a support structure; a driver's seat provided on the left side of the rotating frame; an exterior cover provided on the right side of the rotating frame and covering equipment mounted on the rotating frame; a protection member provided in an upright position at a front right position of the revolving frame to protect the exterior cover from the pillar-shaped body; In a construction machine comprising: The protective member is a support column portion disposed outside the exterior cover in a radial direction centered on the rotation center of the upper rotating body and extending upward from a periphery of the rotating frame; a rotating cylinder portion that is a cylindrical body that covers an outer periphery of the support portion so as to form a gap between the support portion and the rotating cylinder portion, and that is rotatably provided around the support portion; A construction machine characterized by comprising:

2. The construction machine according to claim 1, the rotating cylinder portion is a cylindrical body having both axial ends open, A construction machine characterized in that a cover portion that covers the gap between the support portion and the rotating cylinder portion is provided on the upper part of the support portion.

3. The construction machine according to claim 1, A construction machine characterized in that the rotating cylinder portion is formed as a covered cylindrical body whose upper end is closed by a lid.

4. The construction machine according to claim 1, A construction machine characterized in that the rotating cylinder portion is formed by a plurality of cylindrical bodies divided in the vertical direction.

5. The construction machine according to claim 1, A construction machine characterized in that the rotating cylinder portion is formed as a cylindrical body by connecting a plurality of arc-shaped curved arc plates in the circumferential direction.

6. The construction machine according to claim 1, A construction machine characterized in that another protective member is provided at the left front position of the revolving frame to protect the front portion of the driver's seat from the pillar-shaped body.

Images