JP2000073399A - Ultrasmall revolving work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To protect a cover by fitting the cover of hoses to be arranged on a boom to the boom via vibration control members on the inside of the cover. SOLUTION: Multiple cover fitting seats 103 are fixed to the side face arranged with the work machine houses of a first boom 10, and vibration control rubbers 105 are inserted to the fitting seats 103. Washers 106 are arranged on the vibration control rubbers 105, fitting bolts 107 are screwed to the fitting seats 103 to fix the vibration control rubbers 105. The hoses 102 bound by a binder 102b are covered with a cover 101, and the hold section 101b of the cover 101 is inserted into the grooves of the vibration control rubbers 105 and fixed. The vibration propagated by the first boom 10 is absorbed by the vibration control rubbers 105, the vibration transferred to the cover 101 is reduced, and the loosening of the bolts 107 and the deformation of the cover 101 can be prevented, thereby the cover 101 can be protected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultra-small turning work machine in which a work attachment is mounted on a boom mounted on a swivel table, and the work attachment can be offset right and left.

[0002]

2. Description of the Related Art Heretofore, there has been known an ultra-small turning work machine in which a work attachment is mounted on a boom mounted on a swivel table, and the work attachment can be eccentric to the left and right. In this ultra-small turning machine, the cover of the hydraulic hose is directly attached to the back of the boom. For example, JP
-99754.

A pin for pivotally supporting an offset rod is fixed by fixing a plate fixed to the pin with a bolt. At the connection between the booms, a hose disposed between the booms has a large clearance with the pins to prevent contact with the pins connecting the booms.

At the arm pivot, a plate is welded between brackets of the arm so that the hose does not protrude.

[0005]

In the above-mentioned conventional construction, the cover of the hydraulic hose is directly attached to the back of the boom, so that the pitch of the bolts becomes longer at the time of attachment, and the cover is deformed due to deformation of the cover such as twisting. Bolts may become loose. Further, the cover may be damaged by deformation.

The pin for pivotally supporting the offset rod is fixed by fixing a plate fixed to the pin with a bolt, but the bolt is exposed on the offset rod and comes into contact with an obstacle or the like. And the bolt may be damaged. Since the hose disposed between the booms has a large clearance with the pin, the hose may protrude and interfere with obstacles or the like.

At the arm pivot, the plate is welded between the brackets of the arm so that the hose does not protrude. Therefore, it is difficult to secure a working space for assembling the cylinder to the arm, and it is difficult to assemble. Decrease. Also, it is difficult to protect the hose over a wide range.

[0008]

The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described. That is, in the first aspect, a first boom is attached to the driving unit laterally laterally of the swivel table so as to be rotatable up and down, and a second boom is attached to a tip end of the first boom so as to be rotatable in the left and right direction. A third boom attached to the second boom rotatably in the left-right direction, an arm attached to the third boom so as to be rotatable in the vertical direction, a work attachment attached to a tip of the arm, and An ultra-small turning work machine having a canopy or cabin that covers the driving unit, and a work attachment that can be offset in the left-right direction by turning the second boom in the left-right direction. The hose cover is attached to the boom via a vibration isolating member inside the cover.

According to a second aspect of the present invention, a first boom is rotatably mounted on a lateral side of an operating portion of the swivel base, and a second boom is mounted on a distal end of the first boom so as to be rotatable in the left-right direction. A boom, a third boom rotatably mounted on the second boom in the left-right direction, an arm rotatably mounted on the third boom in a vertical direction, and a work unit mounted on a tip of the arm In the ultra-small turning machine having an attachment and capable of offsetting the work attachment in the left-right direction by rotating the second boom in the left-right direction, a bolt protection member was attached to the pin detent bolt.

[0010] In the third aspect, a first boom is rotatably mounted on a lateral side of an operating portion of the swivel base, and a second boom is mounted on a tip end of the first boom so as to be rotatable in the left-right direction. A boom, a third boom rotatably mounted on the second boom in the left-right direction, an arm rotatably mounted on the third boom in a vertical direction, and a work unit mounted on a tip of the arm In a micro turning machine having an attachment and being capable of offsetting a work attachment in the left-right direction by rotating the second boom in the left-right direction, a hose protection member is provided on a pin head of a pin connecting the boom and the boom. Was provided.

According to a fourth aspect of the present invention, a first boom is rotatably mounted on a lateral side of an operating portion of the swivel base, and a second boom is mounted on a distal end of the first boom so as to be rotatable in the left-right direction. A boom, a third boom rotatably mounted on the second boom in the left-right direction, an arm rotatably mounted on the third boom in a vertical direction, and a work unit mounted on a tip of the arm An ultra-small turning work machine having an attachment and capable of offsetting a work attachment in the left-right direction by rotating the second boom in the left-right direction, a detachable hose cover covering arm brackets and side surfaces. Installing.

[0012]

Next, embodiments of the present invention will be described with reference to the drawings. 1 is a side view showing the ultra-small turning work machine of the present invention, FIG. 2 is a rear view thereof, FIG. 3 is a rear view showing a configuration of a working hose cover, FIG.
FIG. 5 is a front sectional view showing the configuration of the rod support portion, FIG. 6 is a side view showing the configuration of the connecting portion between the first boom and the second boom, FIG. 7 is a side view showing the configuration of a pin protection member, and FIG. Is a perspective view, and FIG. 9 is a side view showing a configuration of a bucket hose cover.

The configuration of the ultra-small turning work machine of the present invention will be described. 1 and 2, a swivel base 4 is attached to a traveling unit 1 equipped with a pair of left and right crawler traveling units 2 so as to be pivotable.
And an operation unit 9 is formed by covering the upper part of the driver's seat 6 with a canopy 7, and a backhoe device 5 is provided laterally to the operation unit 9.
Has been arranged.

A battery 61 and a fuel tank 62 are provided in front of the operation unit 9, and the battery 61 and the fuel tank 62 are covered by a cover 63. In addition, for example, at the rear end of the traveling device 1, a soil discharge plate 3 is mounted.

The backhoe device 5 lifts the first boom 10 to the maximum, and simultaneously moves the arm 13 and the bucket 14
Fully rolled without offsetting left and right (Fig. 1
(The state shown in FIG. 3), the entire structure can be stored within the turning radius of the turntable 4. The bucket 14 and the operating unit 9 are configured so as not to interfere with each other in the small turning storage state in which the entire backhoe device 5 is stored within the turning radius of the turning table 4.

Next, the backhoe device 5 will be described.
The backhoe device 5 includes a first boom 10 rotatably mounted on the swivel table 4, a second boom 11 rotatably mounted on the distal end of the first boom 10, and a second boom 11. A third boom 12 rotatably mounted on the third boom 12, an arm 13 rotatably mounted on the third boom 12 in a vertical direction, and a work attachment mounted on a tip of the arm 13. The arm 13 and the bucket 14 can be offset in the left-right direction by rotating the second boom 11 in the left-right direction.

Then, a boom cylinder 29 is interposed between the first boom 10 and the swivel base 4, and the boom cylinder 2
9, the first boom 10 can be turned up and down, and an arm cylinder 17 is provided between the third boom 12 and the arm 13.
The arm 13 can be turned up and down by the expansion and contraction of the arm cylinder 14, and a bucket cylinder 48 is interposed between the arm 13 and the bucket 14, and the bucket 48 is expanded and contracted by the expansion and contraction of the bucket cylinder 48. It can be turned up and down.

The trajectory 66 in FIG. 1 includes the boom cylinder 29, the arm cylinder 17, and the bucket cylinder 4
The trajectory is the trajectory through which the tip of the bucket 14 passes along with the expansion and contraction of the bucket 8 and the like. The bucket 14 and the driving unit 9 are configured not to interfere with each other in the entire range of the trajectory 66.

The second boom 11 has its lower end connected to the upper end of the first boom 10 and a lower pivot 15 so as to be rotatable left and right, and the upper end of the second boom 11 has an upper pivot 16
By connecting the third boom 12 to the left and right freely rotatable,
An offset cylinder 31 is interposed between the second boom 11 and the first boom 10. In addition, the first boom 1
0 and the third boom 12, an offset rod 30 is erected and both ends of the offset rod 30 are pivotally attached to the first boom 10 and the third boom 12, respectively. Boom 10, second boom 1
The first and third booms 12 constitute a parallel quadruple link mechanism.

The bucket 14 is eccentrically offset from the first boom 10 in the left-right direction by expanding and contracting the offset cylinder 31. In this case, the parallel quadruple link mechanism allows the bucket 14 to be viewed from the front or the rear. The angles of the first boom 10, the third boom 12, the arm 13, and the bucket 14 are not changed and are offset while maintaining the parallel state.

A lower rotating shaft 15 connecting the first boom 10 and the second boom 11 and an upper rotating shaft 16 connecting the second boom 11 and the third boom 12 have respective axes O. P is disposed so as to be parallel to each other, and the lower rotating shaft 15 is arranged such that the lower rotating shaft 15 has the arm 13 side closer to the arm 13 than the opposite direction in a state where the first boom 10 is fully lifted. (In this embodiment, the lower rotation shaft 15
Is located higher than the rear part.

A canopy 7 that covers the upper part of the driver's seat 6
Are supported by a front column 7a and a rear column 7b, the rear column 7b is erected substantially vertically, and the front column 7a is erected rearward. Then, in a side view, the angle formed between the front support column 7a and the axis O of the lower rotation shaft 15 is substantially a right angle.

In the backhoe device 5 configured as described above, the bucket 14 lifts the first boom 10 to the maximum and the small turning storage state in which the arm 93 and the bucket 94 are maximally wound without offsetting. It is configured not to interfere with the driving unit 9. When the second boom 11 is rotated to offset the bucket 14 left and right, the bucket 14 moves in a direction perpendicular to the axis O of the lower rotation shaft 15 in a side view. In this case, the front support 7a of the canopy 7
Is arranged at the front end of the driving unit 9 so that the angle formed by the axis O of the lower rotating shaft 15 is substantially a right angle. Therefore, when the bucket 14 is offset left and right, the bucket 14 It will move substantially parallel to the part support 7a.

In the state in which the first boom 10 is fully lifted, the lower rotating shaft 15 is located at a higher position on the arm 13 side than the opposite direction, so that the second boom 11 is moved to the lower rotating shaft 15. , The bucket 14 moves from the rear to the front in a side view. That is, the front column 7a of the canopy 7 disposed at the tip of the driving section 9 is erected rearward and inclined, and the angle formed by the axis O of the lower rotating shaft 15 is substantially a right angle. When the bucket 14 is offset to the left and right, the bucket 14 moves forward and substantially parallel to the front column 7a.
Never approach.

As described above, the bucket 14 is configured so as not to interfere with the driving unit 9 in the side view in the small turning storage state, and when the bucket 14 is offset in the left-right direction, the bucket 14 Since the bucket 14 does not approach the driving unit 9, the bucket 14 and the driving unit 9 do not interfere with each other in any state.
Can be offset in either the left or right direction without restricting the operation.

As a result, it is not necessary to separately provide a safety device or a control device in order to avoid interference between the driving section 9 and the bucket 14, and the cost and weight of the backhoe device 5 can be reduced. it can.

The first boom 10 and the second boom 11 are configured so as to be inclined rearward when the first boom 10 is lifted to the maximum.
The amount of forward projection of the third boom 12, the arm 13, and the bucket 14, which are connected to a portion closer to the distal end than the second boom 11, is reduced. In addition, with the first boom lifted to the maximum, the second boom 1
1 is set to be larger than the standing angle of the first boom 10.

As described above, when the first boom 10 is raised to the maximum, the first boom 10 and the second boom 1
1 is configured so as to be inclined rearward, and the erected angle of the second boom 11 with respect to the ground is configured to be larger than the erected angle of the first boom 10 so that the front of the backhoe device 5 Further, the turning radius of the backhoe device 5 can be configured to be small by suppressing the amount of protrusion backward.

Next, the support structure of the cover mounted on the boom will be described. 3 and 4, the first boom 1
0, a cover mounting seat 103 is fixedly mounted on the side surface of the work implement hose 102 which is provided.
A plurality of reference numerals 03 are provided on the side of the working machine hose 102. An anti-vibration rubber 105 is inserted into the cover mounting seat 103, and a groove is formed on the outer peripheral surface of the anti-vibration rubber 105.

A washer 106 is provided on the upper surface of the vibration-proof rubber 105. The washer 106 is fixed to the cover mounting seat 103 by screwing a mounting bolt 107 onto the cover mounting seat 103. Has become.

The working machine hose 102 is mounted on a cover 101, and the cover 101 is fixed on the first boom 10 by the cover mounting seat 103. The cover 101 has a holding portion 101b for fixing to the first boom 10, and the holding portion 101b is configured to protrude inward from an outer end of the cover 101. Further, the holding portion 101b is configured to be thicker than other portions of the cover 101,
Is inserted in the groove. With this configuration, the holding portion 101b is configured to be fixed on the first boom 10 via the vibration-proof rubber 105.

The cover 101 is provided with the working machine hose 102.
Is formed, and in the present embodiment, it is configured to have a trapezoidal shape in cross section. Cover 101 of the present embodiment
The right and left side surfaces of the cover 101 have mounting bolts 107 screwed onto the cover mounting seat 103.
Is substantially parallel to a straight line connecting the upper corner portion of the tying tool 102b that ties the head of the work implement hose 102 onto the first boom 10, and has a configuration in which a slight distance is provided outside the straight line. I have. For this reason, the upper surface and the side surface of the cover 101 do not come into contact with the members included in the cover 101, and the working machine hose 102 can be covered while the projecting portion from the first boom 10 is reduced. it can.

In the cover 101, openings are provided on the left and right side surfaces above the mounting bolt 107, and the mounting bolt 107 can be detached from the opening. Therefore, the mounting bolt 107 is also protected by the cover 101 and can be easily attached and detached. Further, since the cover 101 is fixed to the cover mounting seat 103 via the vibration-proof rubber 105, the vibration transmitted from the first boom 10 is absorbed by the vibration-proof rubber 105 and transmitted to the cover 101. Vibration is reduced. As a result, the mounting bolt 107 is loosened by the vibration of the cover 101 propagating from the first boom 10 or the cover 10
1 does not deform. For this reason, the work machine hose 102 is protected by the cover 101 and the cover 1
01 can be improved, and the loosening of the mounting bolt 107 can be reduced. Further, noise due to vibration of the cover 101 can be reduced.

Next, the structure of the fulcrum of the offset rod 30 will be described with reference to FIG. The offset rod 3
The pin 120 is inserted and fixed to the 0 head portion 30b. The pin 120 is inserted into a stay 10b extended from the first boom 10 via a bearing, and the offset rod 30 is configured to be rotatable with respect to the stay 10b.

The offset cylinder 31 is disposed near the offset rod 30 as described above.

One end of a fixed plate 121 is fixed to the pin 120 inserted into the offset rod 30 on the side opposite to the side on which the offset cylinder 31 is provided. Are fixed by pin head fixing bolts 122. The pin head fixing bolt 12 is provided on the side of the head portion 30b where the plate 121 is provided.
A screw hole 30c for screwing the plate 121 is provided. The plate 121 is fixed by screwing and fixing a pin head fixing bolt 122 into which the plate 121 is inserted into the screw hole 30c. The pin 120 to which the 121 is fixed by welding can be fixed.

The pin 120 has the offset rod 30
In order to ensure lubrication between the pin 10 and the stay 10b,
The oil supply unit is provided on the side where the plate 121 is fixed, and the oil supplied to the oil supply unit is interposed between the pin 120 and the stay 12a through an oil supply port provided on the outer peripheral surface of the pin 120. Is supplied to the lubrication section of the bearing. With this configuration, it is possible to supply oil to the bearing, and it is possible to maintain the lubrication of the connection between the offset rod 30 and the stay 12a.

The pin head fixing bolt 122 of the pin 102
A screw hole is provided at the opposite end where is disposed, and the screw hole is provided in the axial direction of the offset rod 30. Also, the head 30 of the offset rod 30
At the end of b, a hole whose direction and position match the screw holes provided in the pin 120 is formed. The pin 120
A bolt 124 for retaining the screw is screwed into the screw hole provided in the head portion 30b through a hole provided in the head portion 30b. Thereby, the pin 120 is fixed.

The position of the pin 120 is
1 and the retaining bolt 124, the positioning accuracy is improved. Further, the pin 120 is fixed to the offset rod 30 by the retaining bolt 124.
, The pin 120 can be firmly held, and the pin 120 can be fixed to the retaining bolt 12.
4 to secure the pin 120 with a small number of members.
Can be fixed to the head 30b of the offset rod 30.

On the side of the head portion 30b of the offset rod 30 where the retaining bolt 124 is provided,
An offset cylinder 31 is provided. However, since the retaining bolt 124 is screwed into the hole provided in the axial direction of the offset rod 30 as described above,
Since the retaining bolt 124 does not have the offset cylinder 31, the work space is not hindered by the offset cylinder 31 when screwing and removing the retaining bolt 124.

Thus, the retaining bolt 124 can be easily attached and detached, and the maintainability and the assemblability are improved.

A bolt protection washer 126 is inserted into the pin head fixing bolt 122, and the bolt protection washer 126 is fixed together with the fixing plate 121 by a pin head fixing bolt 122. The bolt protection washer 126 is sandwiched between a fixing plate 121 and a pin head fixing bolt 122. The area of the contact surface between the fixing plate 121 and the bolt protection washer 126 is the pin head fixing bolt 122 and the bolt protection bolt. Since it is configured to be larger than the area of the contact surface with the washer 126, even when an impact is applied to the washer 126 for bolt protection, the impact is mainly distributed to the fixing plate 121.

Since the fixed plate 121 is fixed on the offset rod 30, the impact transmitted to the fixed plate 121 is dispersed to the offset rod 30. The bolt protecting washer 126 is formed in a cylindrical shape with an open top, and the opening side circumferential portion of the bolt protecting washer 126 is formed in a rounded shape. That is, when viewed in cross section, the opening-side circumferential portion of the bolt protecting washer 126 has a shape in which the tip is replaced with an arc at the corner.

Therefore, even if an impact is applied by the bolt protecting washer 126, the bolt protecting washer 12
6, there is no possibility that the pin head fixing bolt 122 is directly damaged, and the impact received by the bolt protecting washer 126 is distributed to the offset rod 30 via the fixing plate 121, so that the bolt protecting washer 126 receives the impact. The pin head fixing bolt 122 is not damaged by the impact. Thereby, the pin 120 fixed to the pin head fixing bolt 122 is
The durability of the supporting portion of the offset rod 30 can be improved without changing the position.

Further, since the work of the ultra-small turning machine is performed in front of the bolt protection washer 126, even if the bolt protection washer 126 comes into contact with an obstacle or the like, the bolt protection washer 126 allows the pin to be used. Head fixing bolt 12
2 is protected. For this reason, it is possible to improve the durability of the support portion of the offset rod 30, reduce the dispersal of the attention of the worker in the working environment, and improve the working environment.

Next, the structure of the pin 141 connecting the first boom 10 and the second boom 11 will be described with reference to FIGS. The pin 141 is inserted into the first boom 10 and the second boom 11, connects the first boom 10 and the second boom 11, and rotates the second boom 11 with respect to the first boom 10. It is pivoting freely. The pin 141
A work machine hose 102 is disposed from the first boom 10 to the second boom 11 via a rear portion of the pin 141, and a pin positioning plate 141a is fixed to a rear end of the pin 141. On the pin positioning plate 141a, a protection member 142 having a round bar formed in a semicircular or U-shape is fixed. The protection member 142 is disposed on the pin positioning plate 141a fixed to the pin 141, with a portion formed in an arc shape facing the second boom 11 side.

Therefore, even when the working machine hose 102 disposed behind the pin 141 contacts the pin 141, the working machine hose 102 first contacts the protection member 142. Since the protection member 142 has a round bar shape, the protection member 142 has no protrusion, and even when the work machine hose 102 slides on the protection member 142, the work machine hose 102 is caught or damaged. Nothing.

As a result, the working machine hose 102 is
The working machine hose 102 is prevented from being caught on 41 and exerting an unreasonable force on the working machine hose 102 and the surface of the working machine hose 102 is not damaged, and the durability of the working machine hose 102 is improved. In addition, since the working machine hose 102 is protected by the protection member 142 as described above, the play of the working machine hose 102 can be reduced, and the work machine hose 102 is provided between the first boom 10 and the second boom 11. Overhang is reduced.
Thereby, the connecting portion between the first boom 10 and the second boom 11 is formed to be slim, the working hose 102 does not easily come into contact with an obstacle, and the workability of the ultra-small turning work machine is improved.

Next, the protection structure of the cylinder hose 48h connected to the arm cylinder 48 will be described. The arm 13 is pivotally supported at the front end of the third boom 12, and a bucket 14 is pivotally supported at the front end of the arm 13. Brackets 13b are provided at the connection between the arm 13 and the third boom 12, and a bucket cylinder 48 is provided between the brackets 13b.
Are arranged. In addition, the brackets 13b
A cylinder hose 48h connected to the bucket cylinder 48 is also provided therebetween.

A bucket hose cover 151 is fixed to the outer periphery of the brackets 13b, 13b to protect between the brackets 13b, 13b. The pivot portion of the bucket cylinder 48 and the cylinder hose 48h are arranged inside the bucket hose cover 151. The bucket hose cover 151
Is fixed to the bracket 13b on the side surface of the bracket 13b of the arm 13. The bucket hose cover 151 is configured to protect between the brackets 13b and between the brackets 13b and the outer side edges of the bracket 13b, and the bucket hose cover 151 is fixed to the brackets 13b with a bolt from the side.

With the above configuration, the protrusion of the cylinder hose 48h at the connecting portion between the arm 13 and the third boom 12 can be restricted by the bucket hose cover 151, and the cylinder hose 48h can be protected by a simple configuration. It is possible. Further, since the bucket hose cover 151 is provided on the outer side edge of the bracket 13b, the outer peripheral portion of the bracket 13b is protected. Therefore, when the connecting portion between the arm 13 and the third boom 12 comes into contact with an obstacle or the like, the obstacle or the like first contacts the bucket hose cover 151, and the bracket 13b is not damaged.

Further, since the bucket hose cover 151 is fixed to the brackets 13b and 13b from the side by bolts, the bucket hose cover 151 can be easily replaced, and the running cost of the ultra-small turning machine is reduced. be able to. Further, since the bolt for fixing the bucket hose cover 151 is provided on the side surface, the possibility that the bolt contacts an obstacle during operation is low.

When transporting or storing the ultra-small turning machine, the boom of the ultra-small turning machine is tilted forward and the bracket 13
b is grounded. In this case, the bucket hose cover 1
51 protects the brackets 13b and 13b, and the bucket hose cover 151
Since the bucket hose cover 151 is disposed between the b and 13b, the bucket hose cover 151 comes into contact with a surface at a grounded portion.
Breakage of the contact portion of the bucket hose cover 151 is reduced, and the bracket 13b is not damaged.

[0054]

As described above, the present invention has the following advantages. That is, as in claim 1,
A first boom rotatably mounted on a lateral side of the driving section of the swivel base, a second boom rotatably mounted on a distal end of the first boom in a left-right direction, and a left-right direction on the second boom A third boom rotatably mounted on the third boom, an arm vertically rotatably mounted on the third boom, a work attachment mounted on a tip of the arm, and a canopy or cabin covering the driving unit In the ultra-small turning work machine configured so that the work attachment can be offset in the left-right direction by rotating the second boom in the left-right direction, the cover of the hose disposed on the boom is Since it is attached to the boom via the vibration isolating member on the inside, the bolts attaching the cover are prevented from loosening. Further, damage due to vibration of the cover is prevented. For this reason, the cover can be constituted by a thin plate, and the cover can be reduced in weight and manufactured at low cost.

Further, as described in claim 2, the first boom is rotatably mounted on the lateral side of the operating portion of the swivel table, and is rotatably mounted on the distal end of the first boom in the left-right direction. A second boom, a third boom attached to the second boom so as to be rotatable in the left-right direction, an arm attached to the third boom so as to be rotatable in the up-and-down direction, and an end attached to the tip of the arm In the ultra-small turning work machine that has a work attachment and is configured so that the work attachment can be offset in the left and right direction by turning the second boom in the left and right direction, since the bolt protection member was attached to the pin detent bolt, An obstacle does not directly contact the pin detent bolt, and the bolt does not fall off. Further, since the washer also serves as a protection member for the bolt, the invention can be implemented without increasing the number of parts.

Further, the first boom is rotatably mounted on a lateral side of the operating portion of the swivel table, and is rotatably mounted on the distal end of the first boom in the left-right direction. A second boom, a third boom attached to the second boom so as to be rotatable in the left-right direction, an arm attached to the third boom so as to be rotatable in the up-and-down direction, and an end attached to the tip of the arm In a micro-swing machine having a work attachment and capable of offsetting the work attachment in the left-right direction by rotating the second boom in the left-right direction, a hose is provided at a pin head of a pin connecting the boom and the boom. Since the protection member is provided, the clearance of the hose is reduced, and the hose can be disposed near the fuselage, and the hose can be disposed compactly at a portion connecting the booms.

According to a fourth aspect of the present invention, a first boom is attached to a lateral side of the operating portion of the swivel table so as to be rotatable up and down, and a second boom is attached to a tip end of the first boom so as to be rotatable in the left and right directions. A boom, a third boom rotatably mounted on the second boom in the left-right direction, an arm rotatably mounted on the third boom in a vertical direction, and a work unit mounted on a tip of the arm An ultra-small turning work machine having an attachment and capable of offsetting a work attachment in the left-right direction by rotating the second boom in the left-right direction, a detachable hose cover covering arm brackets and side surfaces. Since the hose is mounted, the hose can be covered in a wide range, the hose is hardly damaged, and the bracket covering the cover is protected.

[Brief description of the drawings]

FIG. 1 is a side view showing a micro turning work machine of the present invention.

FIG. 2 is a rear view of the same.

FIG. 3 is a rear view showing a configuration of a work hose cover.

FIG. 4 is a plan sectional view of the same.

FIG. 5 is a front sectional view showing a configuration of a rod support.

FIG. 6 is a side view showing a configuration of a connecting portion between a first boom and a second boom.

FIG. 7 is a side view showing a configuration of a pin protection member.

FIG. 8 is a perspective view of the same.

FIG. 9 is a side view showing a configuration of a bucket hose cover.

[Explanation of symbols]

 O Axis of lower rotation axis P Axis of upper rotation axis 1 Traveling device 4 Revolving base 9 Operating unit 10 First boom 11 Second boom 12 Third boom 13 Arm 14 Bucket (work attachment) DESCRIPTION OF SYMBOLS 15 Lower rotating shaft 16 Upper rotating shaft 21 Arm fulcrum 30 Offset rod 31 Offset cylinder 101 Cover 102 Working oil hose 126 Protective washer 141 Pin 142 Protective member

Claims (4)

[Claims] 1. A first boom that is rotatably mounted on a lateral side of an operating portion of a swivel platform, a second boom that is rotatably mounted on a distal end of the first boom in a left-right direction, A third boom rotatably mounted on the two booms in the left-right direction, an arm mounted on the third boom so as to be rotatable in the vertical direction, a work attachment mounted on a tip of the arm, and a driving unit A canopy or a cabin that covers the boom, and the working attachment can be offset in the left-right direction by turning the second boom in the left-right direction. An ultra-small turning machine, wherein a cover is attached to a boom via a vibration isolating member inside the cover. 2. A first boom mounted to be rotatable up and down on a lateral side of a driving section of the swivel base, a second boom mounted to be rotatable in a left-right direction at a tip end of the first boom, A third boom attached to the two booms so as to be rotatable in the left-right direction, an arm attached to the third boom so as to be rotatable in the vertical direction, and a work attachment attached to a tip of the arm. In a micro turning machine in which the work attachment can be offset in the left and right direction by turning the second boom in the left and right direction, a bolt protection member is attached to the pin detent bolt. Work machine. 3. A first boom mounted to be rotatable up and down on a lateral side of an operating portion of the swivel base, a second boom mounted to be rotatable in the left-right direction at a tip end of the first boom, A third boom attached to the two booms so as to be rotatable in the left-right direction, an arm attached to the third boom so as to be rotatable in the vertical direction, and a work attachment attached to a tip of the arm. In a micro turning machine in which the work attachment can be offset in the left-right direction by turning the second boom in the left-right direction, a hose protection member is provided on the pin head of the pin connecting the boom and the boom. Ultra-small turning machine. 4. A first boom mounted to be able to turn up and down on a lateral side of an operation unit of a swivel base, a second boom mounted to be free to turn left and right at a tip end of the first boom, A third boom attached to the two booms so as to be rotatable in the left-right direction, an arm attached to the third boom so as to be rotatable in the vertical direction, and a work attachment attached to a tip of the arm. In the ultra-small turning machine in which the work attachment can be offset in the left-right direction by turning the second boom in the left-right direction, a detachable hose cover covering arm brackets and side surfaces is mounted. A very small turning machine.