JP5474735B2 - Working machine - Google Patents

Description

  The present invention provides an upper swing body on a lower traveling body, a work front is attached to the upper swing body, and various work tools such as excavation buckets, lifting magnets, and crushing tools are attached to the front end of the work front. In particular, the present invention relates to a configuration for enabling work at a higher place.

  Work machines such as a hydraulic excavator, a crusher, and a lifting magnet generally include a lower traveling body, an upper swing body installed on the lower traveling body, and a multi-joint work front. In such a work machine, the user can reduce the economic burden by sharing the parts other than the work machine main body composed of the lower traveling body and the upper swing body and the work tool on the work front with various work machines. It is.

  In such a working machine, if the working tool main body of the standard machine is used to achieve the height at which the work tool reaches a location higher than that of the standard machine, the working range is expanded, which is practically advantageous for the user. As a technique for increasing the reach height of the work tool, Patent Document 1 discloses that a relay extension boom having a predetermined height is fixed to a swing frame between the swing frame of the upper swing body and the boom. An attached work machine is disclosed.

  Further, in Patent Document 2, as shown in FIG. 9, a connecting portion by a pin 62 with a boom 61 of a boom cylinder 60 is provided with a boss 63 on a side surface (standard position) of the boom and a bracket on a lower surface of the boom (high lift position). When a work at a higher place is necessary, a work tool (bucket) attached to the tip of the arm 65 by connecting the tip of the boom cylinder 60 to the bracket 64 on the lower surface of the boom by a pin 62. A work machine is disclosed in which 66 can reach a higher position.

  Further, in Patent Document 3, as shown in FIG. 10, the boom 61 is divided into a lower boom 61a and an upper boom 61b, and a hydraulic cylinder 67 is attached between the lower boom 61a and the upper boom 61b. A work machine is disclosed in which the hydraulic cylinder 67 is extended to extend the lower boom 61a and the upper boom 61b in a straight line when work at a location is required.

  On the other hand, the conventional lifting magnet machine is configured by attaching a lifting magnet 68 to the tip of an arm 65 as shown in FIG. When such a lifting magnet machine is used to load and unload scrap or the like in the box 72 placed on the loading platform 71 of the truck 70, the boom 61 can be operated without contacting the box 72. The vertical dimension (height) of the bracket 73 to which the magnet 68 is attached is increased.

JP 2006-118151 A JP-A-6-257179 JP 2004-353396 A

  However, as described in Patent Document 1, in the configuration in which the extension boom is interposed between the boom and the turning frame, the work tool reaching height can be increased, but the extension boom remains attached. Therefore, deep excavation with a hydraulic excavator cannot be performed. For this reason, it is necessary to attach and detach the extension boom depending on whether the work location is low or high, and there is a problem that it takes time to attach and detach the extension boom.

  Further, as described in Patent Document 2 and as shown in FIG. 9, when the work tool 66 can reach a higher place, the connecting portion by the pin 62 of the piston rod of the boom cylinder 60 is changed to the bracket 64. In the case of a thing, the range which can make the height which the working tool 66 reaches high is small. In addition, it is necessary to change the connection position of the pin 62 for switching between deep excavation and high-altitude work, and there is a problem that switching takes time.

  Further, the two-piece boom type described in Patent Document 3 and shown in FIG. 10 has a large weight due to the presence of the hydraulic cylinder 67 provided between the lower boom 61a and the upper boom 61b, and the front for working. There was a problem in terms of stability because the center of gravity was biased forward.

  In the case of the lifting magnet machine shown in FIG. 11, since the height of the bracket 73 to which the lifting magnet 68 is attached is increased, the highest position of the attracting surface of the lifting magnet 68 is lowered, and the workable height is lowered. I cannot help it. Moreover, since the height dimension of the bracket 73 is large and the weight is increased, there is a problem that stability is deteriorated and a load that can be lifted is also reduced.

  Further, in order to solve these problems, if the user purchases a large working machine, the purchase price becomes high, which is disadvantageous for the user.

  In view of the above-described problems, the present invention can perform work at as high a location as possible without increasing the scale of the work machine, and can also perform work at low places such as deep excavation. It is an object of the present invention to provide a work machine that can be easily changed in posture for switching work, and that stability is not impaired.

The work machine according to claim 1, wherein the upper swing body is installed on the lower traveling body,
A boom, a boom cylinder for raising and lowering the boom, an arm rotatably attached to the tip of the boom, an arm cylinder for turning the arm, and a work tool rotatably attached to the tip of the arm; A working front having a hydraulic cylinder for rotating the working tool,
In a working machine provided with a front mounting portion having a first pin hole to which the boom can be attached and a second pin hole to which the boom cylinder can be attached to a turning frame which is a base frame of the upper turning body. ,
Between the working front and the swivel frame, a substantially triangular box shape is formed, and a boss is provided at a corner portion of the work front and the pin for inserting the boss and the first pin hole. A movable frame that is pivotably mounted;
A movable frame rotating hydraulic pressure having one end connected to the swivel frame by a pin inserted into the second pin hole and the other end connected to a cylinder mounting bracket provided at a lower portion of the movable frame by a pin. A cylinder ,
A bracket for mounting a boom having a pin hole into which a pin for rotatably mounting the boom is provided in the movable frame at a position above the first pin hole at an upper portion of the inclined front plate portion ; ,
A boom cylinder mounting bracket provided at a lower portion of the inclined front plate portion of the front portion of the movable frame and having a pin hole for rotatably mounting one end of the boom cylinder;
In a state where the movable frame is in the lowest posture, a boom cylinder mounting pin hole provided in the movable frame is positioned in front of the pin hole provided in the movable frame for mounting the boom ,
The pin hole of the bracket for attaching the cylinder to which the other end of the hydraulic cylinder for rotating the movable frame is connected is positioned below the pin hole for attaching the boom cylinder, and the hydraulic cylinder for rotating the movable frame is The movable frame is provided on the lower surface of the movable frame .

The work machine according to claim 2 is the work machine according to claim 1,
The boom mounting pin hole provided at the top of the movable frame is set to be inside the outer end of the crawler in a state where the working front is set sideways with respect to the crawler of the lower traveling body. It is characterized by.

The work machine according to claim 3 is:
Install the upper swing body on the lower traveling body,
A boom, a boom cylinder for raising and lowering the boom, an arm rotatably attached to the tip of the boom, an arm cylinder for turning the arm, and a work tool rotatably attached to the tip of the arm; A working front having a hydraulic cylinder for rotating the working tool,
In a working machine provided with a front mounting portion having a first pin hole to which the boom can be attached and a second pin hole to which the boom cylinder can be attached to a turning frame which is a base frame of the upper turning body. ,
A movable frame provided between the working front and the swivel frame and attached to be pivotable about a pin inserted into the first pin hole;
A movable frame rotating hydraulic cylinder having one end connected to the revolving frame by a pin inserted into the second pin hole and the other end connected to a cylinder mounting bracket at a lower portion of the movable frame by a pin;
A boom mounting bracket provided at a position above the first pin hole in the upper part of the movable frame and having a pin hole for inserting a pin for rotatably mounting the boom;
A bracket for mounting a boom cylinder provided at a front portion of the movable frame and having a pin hole for rotatably mounting one end of the boom cylinder;
In a state where the movable frame is in the lowest posture, a boom cylinder mounting pin hole provided in the movable frame is positioned in front of the pin hole provided in the movable frame for mounting the boom ,
The boom cylinders are attached to the left and right sides of the boom, respectively, and the movable frame rotating hydraulic cylinders are also attached to the left and right sides of the movable frame, respectively.
The boom mounting bracket provided on the upper part of the movable frame is composed of two first bracket plates that are pinned with the foot portion of the boom interposed therebetween,
The bracket for mounting the boom cylinder provided at the front portion of the movable frame is provided between the extending portions of the two first bracket plates and the extending portions of the movable frame. And a second bracket plate for pinching the base end portion of the boom cylinder with each of the extending portions.
The bracket for mounting the movable frame rotating hydraulic cylinder provided at the lower portion of the movable frame is composed of an extension part of the two second bracket plates and a boss provided between the extension parts,
The left and right movable frame rotating hydraulic cylinders are disposed so as to sandwich the extending portion of the second bracket plate, and are connected to both ends of a pin inserted into the boss.

  According to the first aspect of the present invention, the reaching height of the working front can be increased by rotating the movable frame by the hydraulic cylinder and raising the connecting portion of the boom provided on the movable frame. For this reason, since the work of a high place can be performed using a standard machine, a user becomes economically advantageous, without purchasing a large sized working machine. In addition, since the position of the boom foot can be lowered by operating the hydraulic cylinder and lowering the movable frame to a low position, the deep digging function is not sacrificed. In addition, since the movable frame is rotated by the hydraulic cylinder, it is possible to switch between the work at a high place and the work at a low place, so that it is not necessary to attach or detach parts, and the work posture can be easily changed. In addition, it can be constructed with a lighter member than a work front using a two-piece type boom, the degree of stability is reduced, and the amount of counterweight to be added is relatively light.

  According to the second aspect of the present invention, the position of the pin hole for mounting the boom provided in the upper portion of the movable frame is set to the inner side of the outer end portion of the crawler in a state where the front is oriented laterally with respect to the crawler of the lower traveling body. Since it is set, the stability of the work machine is not significantly impaired.

  According to the invention of claim 3, the first bracket plate is used for both the boom mounting and the boom cylinder mounting, and the second bracket plate is used for both the boom cylinder mounting and the movable frame rotating hydraulic cylinder mounting. Therefore, the structure of the movable frame is simplified. Further, since the movable frame rotating hydraulic cylinder is connected to both ends of the pin inserted into the boss sandwiched between the extending portions of the second bracket plate, the movable frame rotating hydraulic cylinder Installation is easy.

It is a side view which shows one Embodiment of the working machine by this invention. It is a side view which shows the attachment structure of the movable frame of this embodiment. (A) is a side view of the movable frame of this embodiment, and (B) and (C) are respectively an E arrow view and an F arrow view of (A). It is sectional drawing which shows the connection structure of the boom of this embodiment, a boom cylinder, the hydraulic cylinder for movable frame rotation, and a movable frame. It is a side view which shows the high place working state by the working machine of this embodiment. It is a side view which shows the deep digging work state by the working machine of this embodiment. In the working machine of this embodiment, it is a side view which shows the working state which attached the lifting magnet as a working tool. FIG. 3B is a view corresponding to FIG. 3B showing another example of the mounting structure of the boom cylinder and the movable frame rotating hydraulic cylinder in the movable frame of the present invention. It is a side view which shows an example of the conventional working machine. It is a side view which shows the other example of the conventional working machine. It is a side view which shows the other example of the conventional working machine.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing an embodiment of a working machine according to the present invention. In FIG. 1, 1 is a work machine main body, and 2 is a work front. The work machine main body 1 includes a lower traveling body 3 and an upper revolving body 5 installed on the lower traveling body 3 via a revolving device 4. The upper revolving body 5 is a revolving frame that is a base frame thereof. A driver's cab 6, a hydraulic power unit 7, a counterweight 8 and the like are mounted on 5a.

  The work front 2 is attached to the revolving frame 5a via the movable frame 9 added according to the present invention. The movable frame 9 is attached to the revolving frame 5a so as to be rotatable about a pin 11 by a movable frame rotating hydraulic cylinder 12.

  The work front 2 includes a boom 14 that is attached to the movable frame 9 so as to be able to be lifted around a pin 13, and a boom cylinder 17 that is attached with both ends connected by pins 15 and 16 between the boom 14 and the movable frame 9. An arm 20 rotatably attached to the tip of the boom 14 around the pin 19, an arm cylinder 23 attached by being connected by pins 21 and 22 between the boom 14 and the arm 20, and a tip of the arm 20 A working tool (bucket in this example) 25 that is pivotably mounted around a pin 24, a working tool rotating hydraulic cylinder 27 having one end connected to the arm 20 by a pin 26, and a piston rod and an arm of the hydraulic cylinder 27 An arm link 30 attached to both ends by pins 28 and 29, a work tool 25, and a hydraulic cylinder 27. Consisting attaching the implement link 32. linked at both ends by a pin 28, 31 between the piston rod.

  FIG. 2 is a side view showing a state in which the movable frame 9 of this embodiment is attached to the revolving frame 5a. Reference numeral 37 denotes a pair of left and right front mounting portions provided at the front portion of the turning frame 5a. The front mounting portion 37 has a first pin hole 37 a that can originally mount the boom 14 with the pin 11 and a second pin hole 37 b that can mount the boom cylinder 17 with the pin 41. In this embodiment, the boom cylinders 17 are attached to the left and right sides of the boom 14, respectively. Therefore, a boss at the bottom side end of the boom cylinder 17 is sandwiched between the pair of left and right front attachment parts 37, and the pins are pinned. Two frames to which 41 is inserted are welded.

  FIG. 3A is a side view of the movable frame 9 of this embodiment, and FIGS. 3B and 3C are a view as viewed from an arrow E and a view as shown by an arrow F, respectively. As shown in FIG. 3, the movable frame 9 is formed in a box shape by welding a plate material 35 around the left and right vertical plates 34, 34 formed in a substantially triangular shape. Reference numeral 36 denotes a boss which is welded to a corner portion of the triangular movable frame 9 and constitutes a pin hole 36a. The boss 36 is fitted between the left and right boom mounting portions 37 of the revolving frame 5a shown in FIG. The movable frame 9 is attached to the revolving frame 5a by the pins 11 inserted into the holes 36a and 37a.

  On the left and right sides of the inclined front plate portion 35a of the movable frame 9, there are two first bracket plates 38 having pin holes 38a that sandwich the foot portion 14a of the boom 14 and are attached by the pins 13, as shown in FIG. 38 is welded. That is, the first bracket plates 38, 38 constitute a boom mounting bracket.

  In this embodiment, as described above, the boom cylinders 17 are provided on the left and right sides of the boom 14, so that the movable frame rotating hydraulic cylinders 12 are also provided on the left and right sides of the lower surface of the movable frame 9. In order to constitute a bracket for mounting the boom cylinder 17, the front plate portion is positioned so as to be positioned between the first bracket plates 38, 38 extending forwardly and the extending portions 38b, 38b. And second bracket plates 39, 39 welded to 35a. The bosses 17a of the left and right boom cylinders 17 are sandwiched between the extending portions 38b and 38b and the second bracket plates 39 and 39, respectively, and are connected by the pins 15. Reference numerals 38c and 39a denote pin holes for inserting the pins 15 provided in the first bracket plate 38 and the second bracket plate 39, respectively. A line connecting the pin holes 36a, 38a, 38c provided in the movable frame 9 forms a triangle.

  As shown in FIG. 2, the movable frame rotating hydraulic cylinder 12 includes a pin hole 37 b provided in the front mounting portion 37 of the swing frame 5 a, a pin 41 inserted into the bottom boss of the hydraulic cylinder 12, and the movable frame 9 side. It attaches between the front attachment part 37 and the movable frame 9 with the pin 42 inserted in the boss | hub 12a (refer FIG. 4) of the edge part and the piston rod side edge part of the hydraulic cylinder 12. FIG.

  That is, in order to connect this movable frame rotating hydraulic cylinder 12 to the movable frame 9, as shown in FIG. 4, between the downwardly extending portions 39b, 39b of the two second bracket plates 39, 39. The boss 40 is clamped and welded. The hydraulic cylinders 12 are arranged so that the extended portions 39b, 39b of the second bracket plates 39, 39 are sandwiched by the bosses 12a at the ends of the piston rods of the left and right movable frame rotating hydraulic cylinders 12, The hydraulic cylinder 12 is attached to the movable frame 9 by the boss 12a, the pin holes 39c and 39c provided in the extending portions 39b and 39b of the second bracket plates 39 and 39, and the pin 42 inserted into the boss 40. Link.

  In this configuration, when the hydraulic cylinder 12 is contracted as shown by a solid line in FIG. 2, the movable frame 9 takes the lowest posture. On the contrary, the movable frame 9 takes the highest posture in a state indicated by a two-dot chain line in which the hydraulic cylinder 12 is extended. A difference in height of the boom 14 indicated by ΔH is generated between the lowest posture and the highest posture. Even when the movable frame 9 takes the lowest posture, the position of the pin 15 for attaching the boom cylinder 17 to the movable frame 9 is ahead of the position of the pin 13 for attaching the boom 14 to the movable frame 9.

  FIG. 5 shows a state in which a crushing tool 43 is attached to the tip of the arm 20 as a work tool and the building 44 is disassembled. In this case, the hydraulic cylinder 12 is extended to rotate the movable frame 9 upward, and the boom By increasing the position of the pin 13 to which 9 is attached, the reaching height of the crushing tool 43 can be increased and the crushing operation can be performed. Even when the work tool performs other work such as a bucket, work at a higher position can be performed.

  On the other hand, as shown in FIG. 6, when deep digging is performed by attaching a bucket 25 as a work tool to the tip of the arm 20, the excavation depth is reduced by contracting the hydraulic cylinder 12 to lower the posture of the movable frame 9. The height can be maintained to the same extent as when there is no movable frame 9.

  Thus, in this embodiment, the reachable height of the work tools 25 and 43 is increased by rotating the movable frame 9 by the hydraulic cylinder 12 and raising the connecting portion of the boom 14 and the boom cylinder 17. be able to. For this reason, since the work of a high place can be performed using a standard machine, a user becomes economically advantageous, without purchasing a large sized working machine.

  Further, the deep digging function is not sacrificed by lowering the movable frame 9 to a low position. Further, by rotating the movable frame 9 by the hydraulic cylinder 12, the posture can be changed for switching between the high place work and the low place work. Therefore, it is not necessary to attach or detach components, and the posture can be easily changed. . Further, it can be made of a lighter member than a work front using a two-piece type boom, the degree of deterioration of stability is small, and the amount of counterweight 8 to be added is relatively light.

  Further, as shown in FIG. 7, when a lifting magnet 68 is attached to the tip of the arm 20 and scraps are stacked and unloaded in a box 72 placed on a loading platform 71 of a truck 70, the hydraulic cylinder 12 is extended to move the movable frame. By raising 9 and raising the boom 14, the work can be performed without the boom 14 coming into contact with the box 72. For this reason, it is not necessary to increase the vertical dimension of the bracket 73A to which the lifting magnet 68 is attached.

  Thus, since the height of the bracket 73A for attaching the lifting magnet 68 can be reduced, the highest position at which the attracting surface of the lifting magnet 68 can reach can be increased. Further, the height of the bracket 73A of the lifting magnet 68 can be reduced and the weight can be reduced, so that the stability can be improved and the load that can be lifted can be increased.

  In addition, as shown in FIG. 2, in the state where the work front 2 is set sideways with respect to the crawler 3 a of the lower traveling body 3, the position of the boom attachment pin hole 38 a provided in the upper part of the movable frame 9 is set to the crawler 3 a. Since it is set inside the outer end of the machine, the stability of the work machine is not impaired.

  Further, in this embodiment, in the movable frame 9, the first bracket plate 38 is used for both mounting the boom 14 and the boom cylinder 17, and the second bracket plate 39 is used for mounting the boom cylinder 17. The structure of the movable frame 9 is simplified because it is also used for mounting the movable frame rotating hydraulic cylinder 12. The movable frame rotating hydraulic cylinder 12 is connected to both ends of a pin 42 inserted into a boss 40 sandwiched between the extended portions 39b, 39b of the second bracket plates 39, 39. Therefore, the movable frame is compared with the case where the movable frame rotating hydraulic cylinder 12 is mounted by holding the boss 12a between the extended portion of the first bracket plate 38 and the extended portion 39b of the second bracket plate 39. The turning hydraulic cylinder 12 can be easily attached.

  In the above embodiment, the boom cylinder 17 and the movable frame rotating hydraulic cylinder 12 are connected to the left and right of the movable frame 9, respectively. The present invention can also be applied to a configuration in which one moving hydraulic cylinder 12 is provided. FIG. 8 is a diagram showing an example of this. The bottom boss 17a of the boom cylinder 17 is fitted between the second bracket plates 39, 39 and connected by a pin (not shown). A structure is shown in which a boss 12a at the end of the piston rod of the movable frame rotating hydraulic cylinder 12 is fitted between the extended portions 39b, 39b of 39 and connected by pins (not shown). In addition, when implementing this invention, for example, a wheel type thing is used as the lower traveling body 3, for example, a various change and addition are possible not only in the said embodiment but in the said embodiment.

1: working machine main body, 2: front for work, 3: lower traveling body, 4: turning device, 5: upper turning body, 5a: turning frame, 6: cab, 7: hydraulic power unit, 8: counterweight, 9 : Movable frame, 11: pin, 12: hydraulic cylinder for rotating movable frame, 13: pin, 14: boom, 15, 16: pin, 17: boom cylinder, 19: pin, 20: arm, 21, 22: pin, 23: Arm cylinder, 24: Pin, 25: Work tool (bucket), 27: Hydraulic cylinder for work tool rotation, 30: Arm link, 32: Work tool link, 34: Vertical plate, 35: Plate material, 36: Boss 36a: Pin hole, 37: Front mounting part, 37a: First pin hole, 37b: Second pin hole, 38: First bracket plate, 38a: Pin hole, 38b: Extension part, 38c: Pin hole 3 : Second bracket plate, 39a: pin hole, 39b: extended portion, 39c: pin hole, 40: boss, 41, 42: pin, 43: work tool (crushing tool), 44: building, 68: lifting magnet , 70: truck, 71: loading platform, 72: box, 73A: bracket

Claims (3)

Install the upper swing body on the lower traveling body,
A boom, a boom cylinder for raising and lowering the boom, an arm rotatably attached to the tip of the boom, an arm cylinder for turning the arm, and a work tool rotatably attached to the tip of the arm; A working front having a hydraulic cylinder for rotating the working tool,
In a working machine provided with a front mounting portion having a first pin hole to which the boom can be attached and a second pin hole to which the boom cylinder can be attached to a turning frame which is a base frame of the upper turning body. ,
Between the working front and the swivel frame, a substantially triangular box shape is formed, and a boss is provided at a corner portion of the work front and the pin for inserting the boss and the first pin hole. A movable frame that is pivotably mounted;
A movable frame rotating hydraulic pressure having one end connected to the swivel frame by a pin inserted into the second pin hole and the other end connected to a cylinder mounting bracket provided at a lower portion of the movable frame by a pin. A cylinder ,
A bracket for mounting a boom having a pin hole into which a pin for rotatably mounting the boom is provided in the movable frame at a position above the first pin hole at an upper portion of the inclined front plate portion ; ,
A boom cylinder mounting bracket provided at a lower portion of the inclined front plate portion of the front portion of the movable frame and having a pin hole for rotatably mounting one end of the boom cylinder;
In a state where the movable frame is in the lowest posture, a boom cylinder mounting pin hole provided in the movable frame is positioned in front of the pin hole provided in the movable frame for mounting the boom ,
The pin hole of the bracket for attaching the cylinder to which the other end of the hydraulic cylinder for rotating the movable frame is connected is positioned below the pin hole for attaching the boom cylinder, and the hydraulic cylinder for rotating the movable frame is The working machine is provided on a lower surface of the movable frame . The working machine according to claim 1,
The boom mounting pin hole provided at the top of the movable frame is set to be inside the outer end of the crawler in a state where the working front is set sideways with respect to the crawler of the lower traveling body. A working machine characterized by Install the upper swing body on the lower traveling body,
A boom, a boom cylinder for raising and lowering the boom, an arm rotatably attached to the tip of the boom, an arm cylinder for turning the arm, and a work tool rotatably attached to the tip of the arm; A working front having a hydraulic cylinder for rotating the working tool,
In a working machine provided with a front mounting portion having a first pin hole to which the boom can be attached and a second pin hole to which the boom cylinder can be attached to a turning frame which is a base frame of the upper turning body. ,
A movable frame provided between the working front and the swivel frame and attached to be pivotable about a pin inserted into the first pin hole;
A movable frame rotating hydraulic cylinder having one end connected to the revolving frame by a pin inserted into the second pin hole and the other end connected to a cylinder mounting bracket at a lower portion of the movable frame by a pin;
A boom mounting bracket provided at a position above the first pin hole in the upper part of the movable frame and having a pin hole for inserting a pin for rotatably mounting the boom;
A bracket for mounting a boom cylinder provided at a front portion of the movable frame and having a pin hole for rotatably mounting one end of the boom cylinder;
In a state where the movable frame is in the lowest posture, a boom cylinder mounting pin hole provided in the movable frame is positioned in front of the pin hole provided in the movable frame for mounting the boom ,
The boom cylinders are attached to the left and right sides of the boom, respectively, and the movable frame rotating hydraulic cylinders are also attached to the left and right sides of the movable frame, respectively.
The boom mounting bracket provided on the upper part of the movable frame is composed of two first bracket plates that are pinned with the foot portion of the boom interposed therebetween,
The bracket for mounting the boom cylinder provided at the front portion of the movable frame is provided between the extending portions of the two first bracket plates and the extending portions of the movable frame. And a second bracket plate for pinching the base end portion of the boom cylinder with each of the extending portions.
The bracket for mounting the movable frame rotating hydraulic cylinder provided at the lower portion of the movable frame is composed of an extension part of the two second bracket plates and a boss provided between the extension parts,
The left and right movable frame rotating hydraulic cylinders are disposed so as to sandwich the extending portion of the second bracket plate, and are connected to both ends of a pin inserted into the boss. .

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