CN216007078U - Movable arm structure of excavator - Google Patents

Abstract

The utility model provides a movable arm structure of an excavator, which comprises: a boom frame in which a body link connected to the upper rotating body is disposed at one end, an arm link is disposed at the other end, an arm cylinder link is disposed at the upper portion, and a boom cylinder link is disposed at the side portion; a side plate disposed at a side of the boom frame; and one or more bulkheads disposed in an internal space formed by the boom frame and the side plates so as to increase rigidity of the boom frame and reduce occurrence of twisting. According to the present invention, there is an effect of enhancing the rigidity of the boom frame and reducing the occurrence of twisting.

Description

Movable arm structure of excavator

Technical Field

The present invention relates to a boom structure of an excavator, and more particularly, to a boom structure of an excavator, in which a diaphragm is disposed inside a boom of an excavator to increase the rigidity of the boom and reduce the occurrence of twisting.

The present invention also relates to a boom structure of an excavator, in which a main shaft cover is disposed at a body connecting portion of a boom of the excavator to increase rigidity of the body connecting portion and reduce occurrence of twisting.

Background

Generally, an excavator is a construction machine used for excavation work of digging a ground at a construction site, loading work of carrying sand, crushing work of demolishing a building, soil preparation work of finishing the ground, and the like.

Fig. 1 is a side view showing a conventional excavator.

Referring to fig. 1, a conventional excavator includes a lower traveling structure 10 movable along a ground surface, an upper rotating structure 20 rotatably provided on an upper portion of the lower traveling structure 10, a boom 30 rotatably coupled to the upper rotating structure 20, a boom cylinder 40 for rotating the boom 30, an arm 50 rotatably coupled to a distal end portion of the boom 30, an arm cylinder 60 for rotating the arm 50, a bucket 70 rotatably coupled to a distal end portion of the arm 50, and a bucket cylinder 80 for rotating the bucket 70.

In the conventional excavator having such a structure, the boom 30 is operated by the boom cylinder 40, the arm 50 is operated by the arm cylinder 60, and the bucket 70 is operated by the arm cylinder 80 to perform work such as digging a ground or shoveling a ground.

In general, since the arm 50 and the bucket 70 are made of a metal material having a heavy weight, the boom 30 has a high rigidity in order to normally support the arm 50 and the bucket 70. In particular, when a heavy metal building material, earth, or the like is loaded into the bucket 70, the rigidity of the boom 30 is further required. If the boom 30 is less rigid, the boom 30 may be distorted and fail to achieve the desired work result.

In addition, in the high-weight work, a large line is applied to the connection portion 31 between the boom 30 and the upper swing structure 20. Therefore, it is necessary to enhance the rigidity at the connection portion 31 between the boom 30 and the upper rotating body 20. If the rigidity of the connection portion 31 is weak, the link pin may be broken or the connection portion 31 of the boom 30 may be twisted, so that the work may not be performed or the accident of being separated from the upper rotating body 20 may occur.

SUMMERY OF THE UTILITY MODEL

The present invention has been made to solve the above-described problems of the related art, and an object of the present invention is to provide a boom structure of an excavator, in which a diaphragm is disposed inside a boom of the excavator to increase the rigidity of the boom and reduce the occurrence of twisting.

Another object of the present invention is to provide a boom structure of an excavator, in which a main shaft cover is disposed at a body connecting portion of a boom of the excavator, thereby increasing rigidity of the body connecting portion and reducing occurrence of twisting.

The above object of the present invention can be achieved by the following means.

In one aspect, the present invention for achieving the above object provides a boom structure of an excavator, including: a boom frame in which a body link connected to the upper rotating body is disposed at one end, an arm link is disposed at the other end, an arm cylinder link is disposed at the upper portion, and a boom cylinder link is disposed at the side portion; a side plate disposed at a side of the boom frame; and one or more bulkheads disposed in an internal space formed by the boom frame and the side plates so as to increase rigidity of the boom frame and reduce occurrence of twisting.

Wherein the boom frame includes: a center block in which the arm cylinder connecting portion is arranged at an upper portion;

a main block having one end connected to the center block and the other end provided with the body connecting portion; and an end block having one end connected to the center block and the other end provided with the arm connecting portion.

Wherein the partition plate includes: a center partition plate disposed in an inner space formed by the center block and the side plates; a main partition plate disposed in an internal space formed by the main block and the side plate; and an end separator disposed in an internal space formed by the end block and the side plate.

Wherein an air hole is formed at the center partition, the main partition, or the end partition.

Wherein the diaphragm further includes a boss diaphragm portion disposed between the boom cylinder connecting portion and the center block in such a manner as to enhance rigidity of the boom cylinder connecting portion to which the boom cylinder is connected and to alleviate occurrence of twisting.

Wherein, axle sleeve baffle portion includes: a first boss spacer disposed between a lower portion of the boom cylinder connecting portion and an inner lower portion of the center block; a second bushing spacer disposed between an upper portion of the boom cylinder connecting portion and an inner upper portion of the center block; and a third boss spacer disposed between an upper portion of the boom cylinder connecting portion and an inner upper portion of the center block at a predetermined interval from the second boss spacer.

Wherein, axle sleeve baffle portion still includes: a second extension plate connected to the second bushing spacer and disposed along an inner upper surface of the center block; and a third extension plate connected to the third bushing shield plate and disposed along an inner upper surface of the center block in a reverse direction of the second extension plate.

Wherein the bushing barrier portion further includes a third bent plate bent to be coupled to an end portion of the third extension plate and disposed along a surface of the side plate.

Wherein the partition plate includes: a main edge partition plate disposed between the main body connection portion and the main partition plate in an internal space formed by the main block and the side plate; and an end edge partition plate disposed between the arm connecting portion and the end partition plate in an internal space formed by the end block and the side plate.

Wherein, the curb plate still includes: a first reinforcing beam disposed to connect upper and lower portions of the main block; and a second reinforcing beam disposed to connect upper and lower portions of the end block.

In another aspect, the present invention for achieving the above object also provides an excavator, comprising: a lower traveling body that moves along the ground; an upper rotating body rotatably disposed on an upper portion of the lower traveling body; a boom configured as the boom structure of the excavator described above rotatably connected to the upper swing structure; a boom cylinder that is connected between the boom and the upper swing body and rotates the boom; an arm rotatably connected to the boom; an arm cylinder that is connected between the boom and the arm and rotates the arm; a bucket rotatably connected to the arm; and a bucket cylinder that is connected between the bucket and the arm and rotates the bucket.

The effects of the present invention are as follows.

According to the utility model, the clapboard is arranged in the excavator boom, so that the rigidity of the excavator boom can be enhanced, and the generation of distortion can be reduced. In addition, the main shaft sleeve is welded and arranged on the body connecting part of the excavator boom, so that the rigidity of the body connecting part of the excavator boom can be enhanced, and the generation of distortion can be reduced.

Therefore, the weight of the excavating arm and the bucket can be stably supported, and particularly, when the bucket is loaded with a heavy metal building material, soil, or the like and is operated, the stability of the operation can be improved.

Drawings

Fig. 1 is a diagram showing a structure of a conventional excavator.

Fig. 2 is a diagram showing an excavator employing a boom structure of the excavator according to the present invention.

Fig. 3 is a perspective view of a boom structure of the excavator according to the present invention.

Fig. 4 is a side view of the boom structure of the excavator in the present invention, except for a side plate.

Fig. 5 is a sectional view of a boom cylinder attachment portion in the present invention.

Fig. 6 is a cross-sectional view of the center spacer of the present invention.

Fig. 7 is a sectional view of the main separator in the present invention.

Fig. 8 is a cross-sectional view of an end baffle in the present invention.

Fig. 9 is a view showing a state in which a link portion of a boss portion of a main spindle is coupled to an end portion of a main diaphragm formed at a boom in the present invention.

Fig. 10 is an upper perspective view showing a link portion of a boss portion in the present invention.

Fig. 11 is a lower perspective view showing a link portion of a boss portion in the present invention.

Fig. 12 is a plan view showing a link portion of the boss portion in the present invention.

Fig. 13 is a perspective view showing a bending frame of the spindle cover portion in the present invention.

Description of the symbols

100: boom, 110: boom frame, 111: center block, 112: main block, 113: curve portion, 114: body connecting portion, 114 a: elongated end, 115: arm cylinder connection portion, 116: end block, 117: arm connecting portion, 119: extension, 120: side plate, 121: first reinforcing beam, 122: second reinforcing beam, 123: expansion side plate, 125: side plate end, 125 a: first side panel, 125 b: second side panel surface, 131: primary edge baffle, 132: main separator, 133: center spacer, 134: end separator, 132a, 133a, 134 a: air hole, 135: end edge separator, 140: shaft bushing separator portion, 141: first bushing spacer, 142: second bushing spacer, 143: second extension plate, 145: third bushing spacer, 146: third extension plate, 147: third curved plate, 150: boom cylinder connecting portion, 151: hollow portion, 152: through-hole, 153: connecting plate, 154: block, 200: spindle sleeve portion, 210: curved frame, 211: boom fixing section, 212: spindle cover fixing section, 213: frame hole, 220: spindle block, 222: spindle bushing hole, 224: flange portion, 225: contact end, 226: projection, 230: and a wing portion.

Detailed Description

Preferred embodiments of a boom structure of an excavator according to the present invention will be described in detail with reference to the accompanying drawings.

First, fig. 2 is a diagram showing an excavator that employs a boom structure of the excavator according to the present invention.

Referring to fig. 2, a basic structure of an excavator to which the boom 100 of the present invention is mounted may include a lower traveling body 300 movable along a ground surface, an upper rotating body 900 rotatably provided on an upper portion of the lower traveling body 300, the boom 100 connected to a main shaft sleeve 200 of a link block 930 rotatably coupled to the upper rotating body 900 by welding, a boom cylinder 400 rotating the boom 100, an arm 500 rotatably coupled to a front end portion of the boom 100, an arm cylinder 600 rotating the arm 500, a bucket 700 rotatably coupled to a front end portion of the arm 500, and a bucket cylinder 800 rotating the bucket 700.

The lower traveling body 300 may be formed in a wheel type using wheels or a crawler type using tracks.

The upper rotating body 900 may include a power generating part 910 generating power and a riding part 920 on which a driver can ride.

The boom 100 may be formed to extend in a direction away from the upper rotating body 900.

The boom 100 may include one end hinged to the upper rotating body 900, the other end hinged to the arm 500, and an intermediate end interposed between the one end of the boom 100 and the other end of the boom 100.

The boom cylinder 400 may be formed on the side of the direction of gravity with respect to the boom 100.

In addition, the boom cylinder 400 may include a boom cylinder pipe 410 hinge-coupled to the upper rotating body 900.

The boom cylinder 400 may further include a boom cylinder rod 420, one end of the boom cylinder rod 420 being coupled to the boom cylinder pipe 410 in a reciprocating manner, and the other end being hinged to the middle end of the boom 100.

The stick 500 may be formed to extend in one direction.

In addition, the arm 500 may include one end portion hinge-coupled to the other end portion of the boom 100 and the other end portion hinge-coupled to the bucket 700.

The arm cylinder 600 may be formed on the side of the opposite direction of gravity with respect to the boom 100.

In addition, the arm cylinder 600 may include an arm cylinder pipe 610, and the arm cylinder pipe 610 is hinge-coupled to a middle end portion of the boom 100.

Further, arm cylinder 600 may further include an arm cylinder rod 620, and one end of arm cylinder rod 620 may be coupled to arm cylinder pipe 610 in a reciprocating manner, and the other end may be coupled to one end of arm 500 by a hinge.

The bucket 700 may include a link 710 hinge-coupled to the other end of the arm 500 and a bucket 720 extending from the link 710.

Fig. 3 is a perspective view of a boom structure of an excavator according to the present invention, fig. 4 is a side view of the boom structure of the excavator according to the present invention except for a side plate 120, fig. 5 is a sectional view of a boom cylinder connecting portion 150 according to the present invention, fig. 6 is a sectional view of a center bulkhead 133 according to the present invention, fig. 7 is a sectional view of a main bulkhead 132 according to the present invention, and fig. 8 is a sectional view of an end bulkhead 134 according to the present invention.

Referring to fig. 3 to 8, the boom structure of the excavator in the present invention may be configured to include a boom frame 110, a side plate 120, and a partition 130.

The boom frame 110 may have a body link 114 connected to the upper swing structure 900 at one end, an arm link 117 at the other end, an arm cylinder link 115 at the upper portion, and a boom cylinder link 150 at the side portion.

The side plate 120 may be disposed at a side portion of the boom frame 110.

In addition, one or more bulkheads 130 may be disposed in an inner space formed by the boom frame 110 and the side plate 120 in such a manner as to increase rigidity of the boom frame 110 and reduce occurrence of twisting.

Specifically, first, the boom frame 110 may be configured to include a center block 111, a main block 112, and an end block 116.

The center block 111 may constitute a central portion of the boom frame 110, and the arm cylinder connection part 115 may be disposed at an upper portion thereof. The arm cylinder pipe 610 may be hinge-coupled to the arm cylinder connection part 115, and the arm cylinder rod 620 may be hinge-coupled to the arm.

The main block 112 may constitute one side portion of the boom frame 110, one end portion may be connected to the center block 111 by welding, bolt fastening, or the like, and the other end portion may be provided with the body connecting portion 114.

Further, a curved portion 113 may be formed at the other end portion of the main block 112, and elongated end portions 114a (refer to fig. 9) protruding from the body connection portion 114 may be formed at both sides of the curved portion 113. At this time, the main block 112 may be formed with an expanding portion 119, and the expanding portion 119 may be expanded in an outer direction from a connection portion with the central block 111 toward the extension end portion 114a of the body connection portion 114.

Here, a main boss portion 200 may be disposed at the body connecting portion 114. The main boss portion 200 may be configured to enhance rigidity of the body connection portion 114 and reduce occurrence of twisting, thereby improving a connection force between the body connection portion 114 and the link blocks 930 of the upper rotating body 900. The boss portion 200 will be described later.

The end block 116 may constitute the other side portion of the boom frame 110, and one end portion may be connected to the center block 111 by welding, bolt fastening, or the like, and the arm connecting portion 117 may be disposed at the other end portion. The arm 500 may be hinge-coupled to the arm coupling portion 117.

Then, the side plates 120 may be configured to be coupled by welding, bolt fastening, or the like along the sides of the center block 111, the main block 112, and the end block 116.

In addition, in order to reinforce the rigidity of the side plate 120 and the main block 112 and to mitigate the occurrence of twisting, the side plate 120 may include a first reinforcing beam 121, and the first reinforcing beam 121 is configured to traverse the side plate 120 and to connect upper and lower portions of the main block 112.

Further, to increase the rigidity of the side plates 120 and the end blocks 116 and to mitigate the occurrence of twisting, the side plates 120 may include second reinforcing beams 122, the second reinforcing beams 122 being configured to traverse the side plates 120 and connect upper and lower portions of the end blocks 116.

The first reinforcing beam 121 and the second reinforcing beam 122 may be joined to each other by welding, bolting, or the like across the side plate 120, and both ends of the first reinforcing beam 121 and the second reinforcing beam 122 may be joined to the inner end of the main block 112 or the inner end of the end block 116 by welding, bolting, or the like.

In addition, an expanded side plate 123 expanded in an outer direction corresponding to the expanded portion 119 may be formed in a portion of the side plate 120 corresponding to the main block 112, and a side plate end 125 corresponding to the elongated end 114a may be formed at an end of the expanded side plate 123.

The extended end portion 114a and the side plate end portion 125 may form a portion to be joined by insert welding of a wing portion 230 of the below-described boss portion 200.

Next, referring to fig. 4, the partition 130 may be configured to include a center partition 133, a main partition 132, an end partition 134, a boss partition 140, a main edge partition 131, and an end edge partition 135.

The center partition 133 may be disposed in an inner space formed by the center block 111 and the side plates 120 in such a manner as to enhance rigidity of the center block 111 and to alleviate the occurrence of twisting. Here, the outer circumference of the center partition 133 may be connected by welding along the inner circumference of the center block 111 and the inner circumference of the side plate 120.

The main partition 132 may be disposed in an inner space formed by the main block 112 and the side plate 120 in such a manner as to enhance the rigidity of the main block 112 and to alleviate the occurrence of twisting. Here, the outer circumference of the main partition 132 may be connected by welding along the inner circumference of the main block 112 and the inner circumference of the side plate 120.

The end diaphragm 134 may be disposed in the interior space formed by the end block 116 and the side plate 120 in a manner that increases the rigidity of the end block 116 and mitigates the occurrence of twisting. Here, the outer circumference of the end diaphragm 134 may be connected by welding along the inner circumference of the end block 116 and the inner circumference of the side plate 120.

Here, referring to fig. 6 to 8, the air holes 132a, 133a, 134a may be formed at the center partition 133, the main partition 132, or the end partition 134. The air holes 132a, 133a, and 134a may function to buffer a change in air pressure that may occur in each of the internal spaces divided by welding the boom frame 110, the side plate 120, and the partition 130. That is, the air movement through the air holes 132a, 133a, 134a can function to buffer the air pressure changes according to the internal temperature, the internal pressure, and the like that may occur in the internal space formed by the center partition 133 and the main partition 132 and the internal space formed by the center partition 133 and the end partitions 134.

Next, the boss spacer part 140 may be disposed between the boom cylinder connecting part 150 and the center block 111 in such a manner as to increase the rigidity of the boom cylinder connecting part 150 to which the boom cylinder 400 is connected and to reduce the occurrence of twisting.

The boss spacer part 140 may include a first boss spacer 141, a second boss spacer 142, a third boss spacer 145, a second extension plate 143, a third extension plate 144, and a third bending plate 147.

The first boss spacer 141 may be configured to be welded between a lower portion of the boom cylinder connecting part 150 and an inner lower portion of the center block 111.

In addition, the second boss spacer 142 may be disposed to be welded between an upper portion of the boom cylinder attachment portion 150 and an inner upper portion of the center block 111.

Here, the third boss spacer 145 may be welded between an upper portion of the boom cylinder attachment portion 150 and an inner upper portion of the center block 111 at a predetermined interval from the second boss spacer 142.

That is, the boss partition part 140 is provided with one partition at a lower portion of the boom cylinder connecting part 150 and two partitions at an upper portion thereof to support the boom cylinder connecting part 150.

Here, fig. 5 discloses a sectional structure of the boom cylinder attachment portion 150. Referring to fig. 5, a pair of blocks 154 forming a main body of the boom cylinder attachment portion 150 may be disposed inside the boom frame 110, and the side plates 120 may be welded to the pair of blocks 154, respectively. In addition, the side plates 120 may be welded to the inner side of the center block 111. The pair of blocks 154 may be welded to the connection plate 153 to form the hollow portion 151, and may be connected to the through holes 152 formed in the pair of blocks 154. The link pin may penetrate the through hole 152 to connect the boom cylinder rod.

Accordingly, the first, second, and third boss bulkheads 141, 142, and 145 constituting the boss bulkhead part 140 may be respectively connected to the block body 154 to enhance the rigidity of the block body 154 applying the load of the boom cylinder rod 420 and to alleviate the occurrence of twisting.

Next, the second extension plate 143 may be coupled to the second bushing separator 142 and welded along the inner upper surface of the center block 111.

The second extension plate 143 may be integrally formed with the second bushing barrier 142 as a metal plate, and an end of the second bushing barrier 142 may be bent to be formed. Alternatively, the second extension plate 143 may be connected to an end of the second bushing barrier 142 in a bent state by welding. Thereby, the second extension plate 143 may enhance the rigidity of the second bushing barrier 142 and improve the anti-twisting function.

Next, the third extension plate 144 may be connected to the third bushing shield 145 and disposed by welding along an inner upper surface of the center block 111 in a reverse direction of the second extension plate 143.

Similarly, the third extension plate 144 is also formed integrally with the third sleeve spacer 145 as a metal plate, and the end of the third sleeve spacer 145 may be bent. Alternatively, the third extension plate 144 may be connected to an end of the third sleeve partition 145 in a bent state by welding. Thereby, the third extension plate 144 may enhance the rigidity of the third sleeve partition 145 and improve the anti-twisting function.

The third curved plate 147 may be connected to an end of the third extending plate 144 by being curved and welded along the surface of the center spacer 133. Thereby, the third boss partition 145 is supported by the third extension plate 144 and the third bending plate 147, and thus the boom cylinder connecting portion 150 can be supported more firmly.

Next, the main edge partition 131 may be welded and disposed between the main body coupling portion 114 and the main partition 132 in an inner space formed by the main block 112 and the side plate 120. Since the main sleeve portion 200 to be described later is disposed in the main body connecting portion 114 and the main sleeve portion 200 is connected to the upper rotating body 900, a large load proportional to the load of the boom frame 110 is applied to the main body connecting portion 114. Therefore, a member that enhances the rigidity of the boom frame 110 adjacent to the body connecting portion 114 and alleviates the distortion is required.

Therefore, by disposing the main edge bulkhead 131 close to the body connecting portion 114, it is possible to enhance the rigidity of the boom frame 110 at the adjacent portion of the body connecting portion 114 and to alleviate the occurrence of twisting.

The end edge partition plate 135 may be welded to be disposed between the arm connecting portion 117 and the end partition plate 134 in the internal space formed by the end block 116 and the side plate 120. Since the arm 500 is connected to the arm link 117, a large load proportional to the load of the arm 500 is applied to the arm link 117. Therefore, a member that increases the rigidity of the boom frame 110 adjacent to the arm connecting portion 117 and reduces twisting is required.

Therefore, by disposing the main edge bulkhead 131 close to the arm link 117, it is possible to enhance the rigidity of the boom frame 110 at the adjacent portion of the arm link 117 and to alleviate the occurrence of twisting.

On the other hand, fig. 9 is a view showing a state in which a link portion of a boss portion 200 in the present invention is coupled to an end portion of a main diaphragm 132 formed at a boom, fig. 10 is an upper side perspective view showing the link portion of the boss portion 200 in the present invention, fig. 11 is a lower side perspective view showing the link portion of the boss portion 200 in the present invention, fig. 12 is a plan view showing the link portion of the boss portion 200 in the present invention, and fig. 13 is a perspective view showing a bent frame 210 of the boss portion 200 in the present invention.

Referring to fig. 9 to 13, the boom structure of the excavator in the present invention may be configured to include a boom frame 110, a side plate 120, a curved frame 210, and a spindle housing portion 200.

Since the structures of the boom frame 110, the side plate 120, and the above-described bulkheads are the same as those described with reference to fig. 3 to 8, the curved frame 210 and the boss portion 200 will be described below.

Referring to fig. 3 and 13, the bending frame 210 may be configured by welding along the end of the body connection part 114 in such a manner as to enhance the rigidity of the body connection part 114 and to alleviate the occurrence of twisting. As described above, the curved portion 113 is formed at the end of the body connecting portion 114, and the bent frame 210 may be welded and disposed inside the curved portion 113 in an arch shape corresponding to the shape of the curved portion 113.

Here, the curved portion 113 is formed in a curved shape which is an optimum shape for relatively uniformly distributing the load applied to the body connecting portion 114 in the radial direction, and the curved frame 210 is also formed in a shape conforming to the arch shape of the curved portion 113, and similarly distributes the load in the radial direction to contribute to the increase in rigidity of the curved portion 113. That is, the bending frame 210 increases the rigidity of the body connecting portion 114, thereby suppressing the occurrence of twisting of the body connecting portion 114.

The curved frame 210 may include a boom fixing portion 211 and a spindle cover fixing portion 212. The boom fixing part 211 may be implemented in a shape corresponding to the curved part 113 formed at the end of the body coupling part 114, and the spindle cover fixing part 212 may be coupled to both side ends of the boom fixing part 211 and formed with a frame hole 213 in which the protrusion part 226 of the spindle cover part 200 is disposed. That is, when the protrusion 226 of the boss portion 200 is inserted into the frame hole 213, the bent frame 210 and the boss portion 200 are coupled.

Next, referring to fig. 9 to 12, the main boss portion 200 may be a member that is disposed between the body connection portion 114 and the curved frame 210 in such a manner as to enhance the rigidity of the body connection portion 114 and to reduce the occurrence of twisting, and is connected to an upper rotating body by a link pin 940.

Such a spindle sleeve portion 200 may be configured to include a spindle sleeve block 220, a wing portion 230, a protrusion portion 226, a contact end portion 225, and a flange portion 224.

The spindle block 220 may be implemented in a cylindrical shape and formed with a spindle housing hole 222 coupled to the upper rotating body 900 by a link pin 940.

The wing part 230 may be formed integrally with the spindle block 220, inserted into the inner side of the extended end 114a of the body connecting part 114, and disposed to be in contact with the first side plate surface 125a of the side plate end 125 of the side plate 120.

Here, a side surface of the wing part 230 may be welded to an inner side of the extended end part 114a, and a lower surface of the wing part 230 may be welded and fixed to the first side plate 125 a.

In addition, the protrusion 226 may be integrally formed with the spindle pocket block 220, inserted into the spindle pocket hole 222 of the curved frame 210, and may couple the spindle pocket block 220 and the curved frame 210. At this time, the projection 226 may be welded in a state of being inserted into the spindle pocket 222.

Next, the contact end 225 may be formed at a lower portion of the wing 230 in the spindle block 220 and configured to be in contact with the second side plate surface 125b of the side plate end 125. Although the contact end 225 and the second side plate surface 125b are shown as being spaced apart in fig. 9, this is for marking the second side plate surface 125b, and actually the contact end 225 and the second side plate surface 125b may be contacted by welding.

Next, the flange portion 224 may protrude outward from both sides of the spindle block 220 and be disposed to contact the extended end portion 114 a. Although shown in fig. 9 with the flange portion 224 and the elongated end 114a spaced apart, this is for the purpose of marking the elongated end 114a, and in fact the flange portion 224 and the elongated end 114a may be contacted by welding.

That is, the wing portions 230 are welded to the first side plate surfaces 125a of the side plate ends 125, the contact end portions 225 are welded to the second side plate surfaces 125b of the side plate ends 125, the flange portions 224 are welded to the extended end portions 114a, and the protruding portions 226 are inserted into the spindle housing holes 222 of the curved frame 210 and connected by welding, so that the spindle housing blocks are firmly fixed to the curved frame 21 and the body connecting portion 114.

This increases the rigidity of the connecting portion of the link pin 940 formed by the boss portion 200 of the main body connecting portion 114, thereby supporting the load applied to the connecting portion between the boom 100 and the upper rotating body 900.

In the present invention, as described above, the boom 100 is reinforced in rigidity and the occurrence of twist is reduced by the bulkhead structure disposed at the boom frame 110 and the structure disposed at the main sleeve portion 200 of the boom frame 110, so that the load applied to the boom 100 can be supported to extend the lifespan of the excavator and to secure the stability of the work.

The above description shows only a specific embodiment of the boom structure of the excavator.

Therefore, it is easily understood by those skilled in the art that the present invention can be replaced and modified in various forms without departing from the spirit of the present invention described in the following claims.

Claims (11)

1. A boom structure of an excavator, comprising:

a boom frame in which a body link connected to the upper rotating body is disposed at one end, an arm link is disposed at the other end, an arm cylinder link is disposed at the upper portion, and a boom cylinder link is disposed at the side portion;

a side plate disposed at a side of the boom frame; and

and one or more bulkheads disposed in an internal space formed by the boom frame and the side plates so as to increase rigidity of the boom frame and reduce occurrence of twisting.

2. The boom structure of an excavator according to claim 1,

the boom frame includes:

a center block in which the arm cylinder connecting portion is arranged at an upper portion;

a main block having one end connected to the center block and the other end provided with the body connecting portion; and

and an end block having one end connected to the center block and the other end provided with the arm connecting portion.

3. The boom structure of an excavator according to claim 2,

the separator includes:

a center partition plate disposed in an inner space formed by the center block and the side plates;

a main partition plate disposed in an internal space formed by the main block and the side plate; and

and an end separator disposed in an internal space formed by the end block and the side plate.

4. The boom structure of an excavator according to claim 3,

an air hole is formed in the center partition, the main partition, or the end partition.

5. The boom structure of an excavator according to claim 4,

the diaphragm further includes a boss diaphragm portion disposed between the boom cylinder connecting portion and the center block in such a manner as to enhance rigidity of the boom cylinder connecting portion connecting the boom cylinder and to alleviate occurrence of twisting.

6. The boom structure of an excavator according to claim 5,

the shaft sleeve partition plate portion includes:

a first boss spacer disposed between a lower portion of the boom cylinder connecting portion and an inner lower portion of the center block;

a second bushing spacer disposed between an upper portion of the boom cylinder connecting portion and an inner upper portion of the center block; and

and a third boss spacer disposed between an upper portion of the boom cylinder connecting portion and an inner upper portion of the center block at a predetermined interval from the second boss spacer.

7. The boom structure of an excavator according to claim 6,

the shaft sleeve partition plate part further comprises:

a second extension plate connected to the second bushing spacer and disposed along an inner upper surface of the center block; and

a third extension plate connected to the third bushing shield plate and disposed along an inner upper surface of the center block in a reverse direction of the second extension plate.

8. The boom structure of an excavator according to claim 7,

the boss spacer portion further includes a third bent plate bent to be connected to an end portion of the third extension plate and disposed along a surface of the side plate.

9. The boom structure of an excavator according to claim 3,

the separator includes:

a main edge partition plate disposed between the main body connection portion and the main partition plate in an internal space formed by the main block and the side plate; and

and an end edge partition plate disposed between the arm connecting portion and the end partition plate in an internal space formed by the end block and the side plate.

10. The boom structure of an excavator according to claim 3,

the side panel further includes:

a first reinforcing beam disposed to connect upper and lower portions of the main block; and

and a second reinforcing beam disposed to connect upper and lower portions of the end block.

11. An excavator, comprising:

a lower traveling body that moves along the ground;

an upper rotating body rotatably disposed on an upper portion of the lower traveling body;

a boom configured as a boom structure of the excavator according to any one of claims 1 to 10 rotatably connected to the upper swing structure;

a boom cylinder that is connected between the boom and the upper swing body and rotates the boom;

an arm rotatably connected to the boom;

an arm cylinder that is connected between the boom and the arm and rotates the arm;

a bucket rotatably connected to the arm; and

a bucket cylinder that is connected between the bucket and the arm and rotates the bucket.

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