CN102502429A - Telescopic truss arm and engineering machinery - Google Patents

Abstract

The invention provides a telescopic truss arm which comprises at least two arm sections (1) and a telescopic mechanism (2) used for stretching the arm sections (1), wherein the arm sections (1) are sleeved with each other, each arm section (1) comprises a plurality of chords (3) and a plurality of web members (4) connected with the chords (3), and the cross sections of the chords (3) are circular. In addition, the invention also provides engineering machinery comprising the telescopic truss arm. By the aid of the telescopic truss arm, the length of the truss arm can be conveniently adjusted. In addition, the chord member can adopt a round pipe, and compared with a common square pipe, the round pipe is good in production manufacturability, higher in straightness and torsion degree, more in specifications of selectable high-strength materials and lower in price, so that the selection range of the chord member of the arm section of the telescopic truss arm is enlarged, and the cost of the telescopic truss arm is reduced.

Description

Telescopic lattice arms and construction machinery

technical field

The invention relates to the field of engineering machinery, in particular to a telescopic lattice arm and construction machinery comprising the telescopic lattice arm.

Background technique

Because the structure of the truss arm is light and the force is good, the truss arm has been widely used in construction machinery. At present, on some construction machinery, the lattice arm needs to change the length of the lattice arm according to the actual working conditions. The usual way is to remove a section of the boom section from the lattice arm or add a section of the boom section to the lattice arm. This method is cumbersome to operate. It is not conducive to saving manpower and time. With the development of the lattice arm, a telescopic lattice arm is gradually produced, and the telescopic lattice arm usually includes a boom section and a telescopic mechanism for telescoping the boom section. Since the boom section can be telescopically extended by the telescopic mechanism, the length of the lattice arm can be adjusted conveniently, thereby saving manpower and time.

Contents of the invention

The object of the present invention is to provide a telescopic lattice arm capable of reducing the cost of the telescopic lattice arm and a construction machine including the telescopic lattice arm.

In order to achieve the above object, the present invention provides a telescopic lattice arm, which includes at least two sleeved boom sections and a telescopic mechanism for telescoping the boom sections, each of which includes A plurality of chords and a plurality of webs connecting the plurality of chords, wherein the cross-sections of the plurality of chords are all circular.

Preferably, the boom section is square, the chords are four and located at four corners of the boom section, and the webs are connected between two adjacent chords.

Preferably, at least one web is arranged eccentrically with respect to two adjacent chords connected to the at least one web.

Preferably, there are three boom sections, two of the opposite webs of the inner boom section are connected to the inner side of the chord, two of the opposite webs of the middle boom section are connected to the inner side of the chord The middle part is connected, two of the opposite webs of the outer jib section are connected to the outer side of the chord, and the two of the opposite webs of the inner jib section and the outer jib section of the outer jib section Two of the opposite web members are respectively located on two sides of the two of the opposite web members of the middle jib section.

Preferably, when the telescopic truss arm is stretched or retracted to a certain position, two adjacent chords of two adjacent boom sections are fixedly connected by pin shafts.

Preferably, a guide pad is provided between two adjacent chords of two adjacent boom sections, the guide pad is fixedly connected to one of the chords, and a guide surface is formed on one side of the guide pad , the guide surface is in contact with the surface of the other chord.

Preferably, the other side of the guide pad is formed with a joint surface, and the joint surface is in contact with the surface of one of the chords, and the guide pad is fixedly connected with the one of the chords by screws.

Preferably, the guide pad includes a first pad and a second pad, the first pad and the second pad cooperate with each other to jointly form the guide surface and the joint surface, and the first pad It is fixedly connected with the second spacer through bolts and nuts.

Preferably, the telescopic mechanism includes a pulley block and a steel wire rope, and the pulley block includes a first pulley and a second pulley, and the first pulley is fixed on the upper part of one side of the outer arm segment among two adjacent arm segments, so The second pulley is fixed on the bottom of the inner jib section among the two adjacent jib sections, one end of the steel wire rope is fixed on the upper part of the other side of the outer jib section, and the other end of the steel wire rope is wound around the The bottom of the second pulley and the top of the first pulley protrude from the first pulley.

In addition, the present invention also provides a construction machine, wherein the construction machine includes the telescopic truss arm provided by the present invention.

Through the telescopic lattice arm provided by the present invention, the length of the lattice arm can be adjusted conveniently. In addition, the chord can be made of a round tube. Compared with the common square tube, the round tube has better production processability, higher straightness and twist, and there are many specifications of high-strength materials that can be selected, and the price is lower, thereby increasing the flexibility. The selection range of the chord of the boom section of the telescopic truss arm reduces the cost of the telescopic truss arm.

Other features and advantages of the present invention will be described in detail in the following detailed description.

Description of drawings

The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the description, together with the following specific embodiments, are used to explain the present invention, but do not constitute a limitation to the present invention. In the attached picture:

Fig. 1 is a schematic structural view of a telescopic lattice arm provided by the present invention;

Fig. 2 is the layout diagram of the telescopic mechanism of the telescopic lattice arm provided by the present invention;

Fig. 3 is a schematic diagram of the telescopic truss arm provided by the present invention being fixed by the pin shaft after being telescopically stretched;

Fig. 4 is a schematic structural view of the telescopic truss arm provided by the present invention provided with guide pads;

FIG. 5 is a partially enlarged schematic view of FIG. 4 .

Explanation of reference signs

1: jib section; 2: telescopic mechanism; 3: chord; 4: web; 5: pin; 6: guide pad; 7: guide surface; 8: first pad; 9: second pad; 10: nut; 11: first pulley; 12: second pulley; 13: wire rope; 14: bolt; 15: screw; 16: joint surface.

Detailed ways

Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

In the present invention, unless otherwise specified, the used orientation words such as "bottom, top, and top" are defined under the working state of the telescopic lattice arm provided by the present invention.

As shown in Figures 1 and 2, the present invention provides a telescopic lattice arm, which includes at least two sleeved boom sections 1 and a telescopic mechanism 2 for telescoping the boom sections 1, each Each of the boom sections 1 includes a plurality of chords 3 and a plurality of webs 4 connecting the plurality of chords 3 , wherein the cross-sections of the plurality of chords 3 are all circular.

Through the telescopic lattice arm provided by the present invention, the length of the lattice arm can be adjusted conveniently. In addition, the chord 3 can use round tubes. Compared with common square tubes, round tubes have better production processability, higher straightness and twist, and can choose high-strength materials with many specifications and lower prices, thereby increasing The selection range of the chords of the boom sections of the telescopic lattice boom reduces the cost of the telescopic lattice boom.

The boom section 1 can be in various appropriate shapes, for example, the boom section 1 can be square, the chords 3 are four and are located at the four corners of the boom section 1, and the adjacent two chords The web bars 4 are connected between the bars 3 . The chord 3 can be connected with the web 4 in various suitable ways, such as welding or fastening.

The web 4 can be connected to the appropriate part of the chord 3, for example, the web 4 can be connected to the inside, middle or outside of the chord 3, in order to increase the gap between the web 4 of the inner and outer arm sections 1, it is convenient to arrange For the electro-hydraulic control system and telescopic mechanism, preferably, at least one web 4 is arranged eccentrically relative to the two adjacent chords 3 connected to the at least one web 4 .

The number of the boom sections 1 can be selected according to specific needs, for example, there can be three boom sections 1 . As shown in Figure 1, when there are three boom sections 1, in order to increase the gap between the webs 4 of the inner and outer boom sections 1, the electro-hydraulic control system and telescopic mechanism are conveniently arranged, preferably, the inner Two of the opposite webs 4 of the jib section 1 are connected to the inner side of the chord 3, two of the opposite webs 4 of the middle jib section 1 are connected to the middle of the chord 3, and the outer jib section Two of the opposite webs 4 of 1 are connected to the outer side of the chord 3, the two of the opposite webs 4 of the inner jib section 1 and the one of the outer jib section 1 The two opposite webs 4 are respectively located on two sides of the two opposite webs 4 of the middle jib section 1 . The other webs 4 of the jib section 1 can be properly arranged, preferably connected as close as possible to the middle of the chord 3 .

When the telescopic truss arm is stretched to a certain position, the two adjacent chords 3 of the two adjacent boom sections 1 can be fixedly connected by various appropriate components. As shown in Figure 3, in order to facilitate the connection, preferably, when the telescopic truss arm is extended or retracted, the two adjacent chords 3 of the two adjacent arm sections 1 pass through the pin shaft 5 Fixed connection.

As shown in Figure 4 and Figure 5, according to a preferred embodiment of the present invention, a guide pad 6 is arranged between two adjacent chords 3 of two adjacent boom sections 1, and the guide pad 6 It is fixedly connected with one of the chords 3 , and a guide surface 7 is formed on one side of the guide pad 6 , and the guide surface 7 is attached to the surface of the other chord 3 . In this way, it can avoid tilting and shaking of the boom section 1 during the telescopic process, and play a guiding role for the boom section 1. In addition, after the boom section 1 is stretched and fixed, when the telescopic boom is working, the guide pad 6 can also eliminate The gap between two adjacent jib sections 1 enables the force between the jib sections 1 to be transmitted through the guide block 6, thereby greatly improving the local stress situation of the jib sections 1. In the embodiment shown in Figure 5, the guide pad 6 is fixedly connected to the outer chord 3, and the guide surface 7 is attached to the surface of the inner chord 3, so that when the inner arm section 1 performs telescopic movement, the guide The guide surface 7 of the spacer 6 can guide the chord 3 and prevent the jib section 1 from tilting or shaking. The shape and size of the guide surface 7 match the shape and size of the other chord 3 so as to guide the chord 3 .

In order to facilitate the fixing of the guide pad 6, preferably, the other side of the guide pad 6 is formed with a joint surface 16, and the joint surface 16 is attached to the surface of one of the chords 3, and the guide pad 6 6 is fixedly connected with one of the chords 3 by screws 15 . The shape and size of the joint surface 16 matches the shape and size of one of the chords 3 .

In order to facilitate the adjustment of the gap between the guide pad 6 and two adjacent chords 3, so that the guide surface 7 and the joint surface 16 fit better with the chord 3, preferably, the guide pad 6 includes a second A cushion block 8 and a second cushion block 9, the first cushion block 8 and the second cushion block 9 cooperate with each other to jointly form the guide surface 7 and the joint surface 16, the first cushion block 8 and the second cushion block The blocks 9 are fixedly connected by bolts 14 and nuts 10 . As shown in FIG. 5 , the gap between the first spacer 8 and the second spacer 9 and the two adjacent chords 3 can be adjusted by adjusting the length of the bolts 14 bolted in.

The guide pads 6 can be arranged between any two adjacent chords 3 as required, and the number of guide pads 6 arranged between any two adjacent chords 3 can be selected according to requirements.

The telescoping mechanism 2 can take various appropriate forms, as shown in FIG. Two pulleys 12, the first pulley 11 is fixed on the upper part of one side of the outer arm section 1 of two adjacent arm sections 1, and the second pulley 12 is fixed on the inner side of two adjacent arm sections 1 The bottom of the jib section 1, one end of the wire rope 13 is fixed on the upper part of the other side of the outer jib section 1, and the other end of the wire rope 13 is wound around the bottom of the second pulley 12 and the second pulley in turn. The top of a pulley 11 protrudes from said first pulley 11 . In this way, the expansion and contraction of each boom can be controlled by an independent winch, which has high reliability and good safety.

There may be two second pulleys 12 , and the two second pulleys 12 may be arranged on both sides of the bottom of the inner jib section 1 among two adjacent jib sections 1 .

The number of telescopic mechanisms 2 can be selected according to the number of boom sections 1 , as shown in FIG. 2 , two groups of telescopic mechanisms 2 are provided.

The first pulley 11 and the second pulley 12 can be fixed in various suitable ways, for example, fixed by brackets. The steel wire rope 13 can be fixed in various suitable ways, such as by a bracket.

In addition, the present invention also provides a construction machine, wherein the construction machine includes the telescopic truss arm provided by the present invention.

The telescopic lattice arm provided by the specific embodiment of the present invention has the following advantages:

1) The telescopic truss arm provided by the present invention can conveniently adjust the length of the truss arm, thereby saving manpower and time;

2) The chord 3 can be made of a round tube. Compared with the common square tube, the round tube has better production processability, higher straightness and twist, and there are many specifications of high-strength materials to choose from, and the price is lower.

3) When the telescopic truss arm is telescopically in place, the adjacent two chords 3 of the two adjacent boom sections 1 are fixedly connected by the pin shaft 5, so that the position of the boom section 1 can be fixed conveniently;

4) Through the setting of the guide pad 6, it is possible to avoid tilting and shaking of the boom section 1 during the expansion and contraction process, and play a guiding role for the boom section 1. In addition, after the boom section 1 completes expansion and contraction and is fixed, when the telescopic arm works , the guide pad 6 can also eliminate the gap between two adjacent boom sections 1, so that the force between the boom sections 1 is transmitted through the guide pad 6, thereby greatly improving the local stress of the boom section 1;

5) The expansion and contraction of each boom can be controlled by an independent winch, which has high reliability and good safety.

The preferred embodiment of the present invention has been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the specific details of the above embodiment, within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, These simple modifications all belong to the protection scope of the present invention.

In addition, it should be noted that the various specific technical features described in the above specific implementation manners may be combined in any suitable manner if there is no contradiction. In order to avoid unnecessary repetition, various possible combinations are not further described in the present invention.

In addition, various combinations of different embodiments of the present invention can also be combined arbitrarily, as long as they do not violate the idea of the present invention, they should also be regarded as the disclosed content of the present invention.

Claims (10)

1. A telescopic lattice arm, the telescopic lattice arm comprises at least two sleeved boom sections (1) and a telescopic mechanism (2) for telescoping the boom sections (1), each of the boom sections (1) all comprise a plurality of chords (3) and a plurality of webs (4) connecting the plurality of chords (3), characterized in that the cross-sections of the plurality of chords (3) are round. 2. The telescopic lattice arm according to claim 1, characterized in that, the boom section (1) is square, the chords (3) are four and are located on the four boom sections (1) In the corner, the webs (4) are connected between two adjacent chords (3). 3. The telescopic lattice arm according to claim 2, characterized in that at least one web (4) is arranged eccentrically with respect to two adjacent chords (3) connected to the at least one web (4) . 4. The telescopic truss arm according to claim 3, characterized in that there are three boom sections (1), and two of the inner boom sections (1) have two opposite webs (4) connected to the The inner side of the chord (3) is connected, two of the opposite webs (4) of the middle jib section (1) are connected to the middle of the chord (3), two of the outer jib sections (1) The opposite webs (4) are connected to the outer side of the chord (3), and the two opposite webs (4) of the inner jib section (1) and the outer jib section (1) ) of the two opposite webs (4) are respectively located on both sides of the two opposite webs (4) of the middle jib section (1). 5. The telescopic lattice arm according to any one of claims 1 to 4, characterized in that, when the telescopic lattice arm is extended or retracted, the phases of two adjacent boom sections (1) The adjacent two chords (3) are fixedly connected by pin shafts (5). 6. The telescopic truss arm according to any one of claims 1 to 4, characterized in that a guide is set between two adjacent chords (3) of two adjacent arm sections (1) pad (6), the guide pad (6) is fixedly connected with one of the chords (3), and one side of the guide pad (6) is formed with a guide surface (7), the guide surface (7) and The surface of the other chord (3) is bonded. 7. The telescopic truss arm according to claim 6, characterized in that, the other side of the guide block (6) is formed with a joint surface (16), and the joint surface (16) is connected to one of the chords The surfaces of the rods (3) are attached, and the guide block (6) is fixedly connected with one of the chord rods (3) through screws (15). 8. The telescopic lattice arm according to claim 7, characterized in that, the guide block (6) comprises a first block (8) and a second block (9), and the first block (8) ) and the second spacer (9) cooperate with each other to jointly form the guide surface (7) and the joint surface (16), and the first spacer (8) and the second spacer (9) pass the bolt ( 14) is fixedly connected with nut (10). 9. The telescopic lattice arm according to any one of claims 1 to 4, characterized in that, the telescopic mechanism (2) includes a pulley block and a steel wire rope (13), and the pulley block includes a first pulley (11) and a The second pulley (12), the first pulley (11) is fixed on the upper part of one side of the outer arm section (1) in two adjacent arm sections (1), and the second pulley (12) is fixed At the bottom of the inner jib section (1) among two adjacent jib sections (1), one end of the steel wire rope (13) is fixed to the upper part of the other side of the outer jib section (1), the The other end of the steel wire rope (13) is wound around the bottom of the second pulley (12) and the top of the first pulley (11) in sequence and protrudes from the first pulley (11). 10. A construction machine, characterized in that the construction machine comprises the telescopic lattice arm according to any one of claims 1-9.

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