CN115893230A - Telescopic truss arm and engineering machinery - Google Patents

Abstract

The application discloses telescopic truss arm and engineering machine tool. The telescopic truss arm comprises at least three layers of arm sections which are sequentially sleeved. The arm segment includes a plurality of arm segment faces and a slider assembly. Each arm nodal surface includes two main chords, a plurality of web members, and a plurality of connecting plates. The two main chords are arranged in parallel at intervals. At least one end of the main chord is provided with a slide block component. A plurality of web members are disposed between the two main chords. The web member and the main chord member are connected by the connecting plate. The thickness of the connecting plate is smaller than that of the web members. Due to the plate-shaped characteristic of the connecting plate, a larger space is reserved between adjacent layer arm sections, and the sliding block assembly is arranged in the space, so that the inner layer arm sections slide smoothly, and more layers of arm sections are sleeved. The telescopic range of the telescopic truss arm is increased, the sliding smoothness and the bearing capacity of each arm section are guaranteed, the operation applicability of the engineering machinery is improved, and transition operation and construction in a narrow operation space are facilitated.

Description

Telescopic lattice arms and construction machinery

technical field

The present application relates to the field of crane hoisting, in particular to a telescopic lattice arm and engineering machinery.

Background technique

Compared with the box-type boom, the lattice boom has the advantages of light weight and strong bearing capacity, but the boom section of the lattice-boom crawler crane needs to be disassembled and transported by a pallet truck, and then assembled after arriving at the work site. Compared with the box-type telescopic boom crane, no assembly is required The boom requires a lot of time to disassemble and assemble the boom, which seriously restricts the construction efficiency. At present, several types of telescopic lattice boom crawler cranes have been launched in China, but due to structural limitations, the main chords of the jib sections are mostly L-shaped tailor-welded structures, square tailor-welded structures, many welds, and high manufacturing costs. The patent also proposes partial solutions, but there are obvious deficiencies.

It should be noted here that the statements in the background technology section only provide background technology related to the present application, and do not necessarily constitute prior art.

Contents of the invention

The application provides a telescopic truss arm and construction machinery to facilitate transition operations and construction in narrow working spaces.

The first aspect of the present application provides a telescopic lattice arm. The telescopic truss arm includes at least three layers of arm sections that are sheathed in sequence. The boom section includes multiple boom section faces and slider assemblies. Each jib section includes two main chords, multiple webs and multiple connecting plates. The two main chords are arranged in parallel and spaced apart. At least one end of the main chord is provided with a slider assembly. A plurality of webs are disposed between the two main chords. The connecting plate connects the web and the main chord. The thickness of the connecting plate is smaller than that of the web.

In some embodiments, the connecting plates include first and second connecting plates arranged at different positions in the circumferential direction of the main chord. The first connecting plate and the second connecting plate are respectively located on two adjacent arm joint surfaces.

In some embodiments, a slider assembly includes a mount and a slider body. The slider body is detachably mounted on the mounting seat.

In some embodiments, the slider assembly further includes a cover plate and a mounting slot. The installation groove is arranged on the installation base. The slider body is placed on the mounting base through the mounting groove. The cover plate is used to connect with the mounting base after the slider body is placed on the mounting base to cover the notch of the mounting groove and fix the slider body.

In some embodiments, the top end of the main chord of the outermost jib section is provided with a slider assembly, the bottom end of the main chord of the innermost jib section is provided with a slider assembly, and the arms of the remaining layers The top and the bottom of the main chord of the section are respectively provided with slider assemblies.

In some embodiments, the slider assembly has a guide surface. The shape of the guide surface is adapted to the cross-sectional shape of the main chord. The main chord of the inner jib section among the two adjacent jib sections is configured to be slidable relative to the main chord of the outer jib section through the guide surface. The guide surface of the slider assembly at the top of the outermost arm section is set inwardly. The guide surface of the slider assembly at the bottom end of the innermost arm section is set outward. The rest of the jib sections are intermediate jib sections. The guide surface of the slider assembly at the top of the middle layer arm section is set inwardly. The guide surface of the slider assembly at the bottom end of the middle layer arm section is set outward.

In some embodiments, the cross-sectional shape of the main chord is circular.

In some embodiments, the cross-sectional shape of the arm section includes a rectangle.

In some embodiments, the cross-sectional shape of the web is circular.

The second aspect of the present application provides a construction machine, including the above-mentioned telescopic lattice arm, a luffing mechanism and a base. The first end of the telescopic lattice arm is rotatably connected with the base. The second end of the lattice arm is used for connecting the working mechanism. The luffing mechanism is drivingly connected with the telescopic truss arm to drive the telescopic truss arm to change the amplitude.

Based on the technical solution provided by the present application, the telescopic truss arm includes at least three layers of arm sections that are nested in sequence. The boom section includes multiple boom section faces and slider assemblies. Each jib section includes two main chords, multiple webs and multiple connecting plates. The two main chords are arranged in parallel and spaced apart. At least one end of the main chord is provided with a slider assembly. A plurality of webs are provided between the two main chords. The connecting plate connects the web and the main chord. The thickness of the connecting plate is smaller than that of the web. Due to the plate-like characteristics of the connecting plate, a large space is reserved between two adjacent layers of arm sections, and the slider assembly is installed through this space, so that the inner arm section can slide smoothly and more layers of arms can be realized. festival set. The newly installed jib section still uses the connecting plate to connect the main chord and the web, so there is still space for installing sliders between the jib section of the new layer and the jib section of the adjacent layer, and the jib section of the new layer can still be smoothly slide. While increasing the stretching range of the telescopic truss arm, it ensures the smoothness of sliding and carrying capacity of each arm section, and improves the operational applicability of construction machinery. Under the premise that the maximum working height remains the same, the sheathing of more layers of boom sections makes the overall length of the truss boom smaller when each boom section is fully retracted, which is convenient for transition operations and construction in narrow working spaces.

Other features of the present application and advantages thereof will become apparent through the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings.

Description of drawings

The drawings described here are used to provide a further understanding of the application and constitute a part of the application. The schematic embodiments and descriptions of the application are used to explain the application and do not constitute an improper limitation to the application. In the attached picture:

Fig. 1 is a schematic cross-sectional view of a truss arm of a three-layer jib section in the prior art.

Fig. 2 is a schematic cross-sectional view of a telescopic lattice arm according to an embodiment of the present application.

Fig. 3 is a schematic diagram of nesting two adjacent layers of boom sections in Fig. 2 .

FIG. 4 is a schematic diagram of a slider assembly with a guide facing inward according to an embodiment of the present application.

FIG. 5 is an assembly diagram of the slider assembly in FIG. 4 .

FIG. 6 is a schematic diagram of the slider assembly with the guide facing outward according to the embodiment of the present application.

FIG. 7 is an assembly diagram of the slider assembly in FIG. 6 .

FIG. 8 is a schematic view of the slider assembly viewed along the X direction in FIG. 3 .

FIG. 9 is a schematic diagram of the slider assembly viewed from the second slider along the Y direction in FIG. 3 .

Fig. 10 is a schematic diagram of inserting the inner arm section into the outer arm section.

Fig. 11 is a diagram showing the thickness of web bars with different cross-sectional shapes.

In the picture:

1. Boom section; 11. Main chord; 12. Web member; 13. Connecting plate; 131. First connecting plate; 132. Second connecting plate; 14. Slider assembly; 141. Mounting seat; 142. Slider Body; 143, cover plate; 144, installation groove; A, guide surface.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. The following description of at least one exemplary embodiment is merely illustrative in nature and in no way serves as any limitation of the application, its application or uses. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

The relative arrangements of components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. At the same time, it should be understood that, for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. Techniques, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, techniques, methods and devices should be considered part of the description. In all examples shown and discussed herein, any specific values should be construed as illustrative only, and not as limiting. Therefore, other examples of the exemplary embodiment may have different values. It should be noted that like numerals and letters denote like items in the following figures, therefore, once an item is defined in one figure, it does not require further discussion in subsequent figures.

For the convenience of description, spatially relative terms may be used here, such as "on ...", "over ...", "on the surface of ...", "above", etc., to describe the The spatial positional relationship between one device or feature shown and other devices or features. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, devices described as "above" or "above" other devices or configurations would then be oriented "beneath" or "above" the other devices or configurations. under other devices or configurations". Thus, the exemplary term "above" can encompass both an orientation of "above" and "beneath". The device may be positioned in other different ways and the spatially relative descriptions used herein interpreted accordingly.

Referring to FIG. 2 , the present application provides a telescopic lattice arm. The telescopic truss boom includes at least three layers of boom sections 1 that are sheathed in sequence. The jib section 1 includes a plurality of jib sections and slider assemblies 14 . Each jib section includes two main chords 11 , multiple webs 12 and multiple connecting plates 13 . Two main chords 11 are arranged in parallel and spaced apart. At least one end of the main chord 11 is provided with a slider assembly. A plurality of webs 12 are arranged between two main chords 11 . The connecting plate 13 connects the web 12 and the main chord 11 . The thickness of the connecting plate 13 is smaller than that of the web 12 .

Since the web 12 has a certain thickness, if the web 12 is directly connected to the main chord 11, the gap between two adjacent layers of jib sections is limited and the slider cannot be installed. In order to overcome this shortcoming, referring to FIG. 1 , in the prior art, the connecting position of the outermost web 12a and the main chord 11a is farther away from the jib section than the connecting position of the middle web 12a and the main chord 11a internal. The connection position between the innermost web member 12a and the main chord 11a is closer to the inside of the jib section than the connection position between the middle layer web member 12a and the main chord 11a. In this way, space is reserved for the installation of the slider, however, the fourth-level jib section can no longer be installed in this way. However, in this application, due to the plate-like characteristics of the connecting plate, a large space is reserved between two adjacent layers of arm sections 1, and the slider assembly 14 is installed through this space, so that the inner layer arm sections can slide smoothly and realize More layers of jib sections. The newly installed jib section still uses the connecting plate 13 to connect the main chord 11 and the web 12, so there is still space for installing sliders between the jib section of the new layer and the jib section of the adjacent layer, and the jib section of the new layer Still glides smoothly. While increasing the stretching range of the telescopic truss arm, it ensures the smoothness of sliding and carrying capacity of each arm section, and improves the operational applicability of construction machinery. Under the premise that the maximum working height remains unchanged, more layers of jib sections can make the overall length of the truss arm smaller when each jib section is fully retracted, which is convenient for transition operations and construction in narrow working spaces.

Referring to FIG. 11 , in some embodiments, the cross-sectional shape of the web 12 is circular. At this time, the thickness of the web 12 is the diameter of the circular section. In some other embodiments, the cross-sectional shape of the web 12 is polygonal (eg, rectangular). At this time, the thickness of the web bar 12 is the height of the polygonal section.

In order to increase the stability of the structure, in some embodiments, the connecting plate and 13 main chord 11 and between the connecting plate 13 and the web 12 are fixedly connected by welding.

Referring to FIGS. 2 and 4 , in some embodiments, the connecting plate 13 includes a first connecting plate 131 and a second connecting plate 132 arranged at different positions in the circumferential direction of the main chord 11 . The first connecting plate 131 and the second connecting plate 132 are respectively located on two adjacent arm joint surfaces. Specifically, there are multiple first connecting plates 131 and second connecting plates 132 arranged at intervals in the extending direction of the main chord 11 . Correspondingly, referring to FIG. 3 , on any jib joint plane, multiple web members 12 are connected between two main chords 11 , and the multiple jib joint planes together form a truss-type jib structure.

In some embodiments, multiple arm section surfaces jointly form the arm section 1 whose cross-sectional shape is polygonal. Specifically, referring to FIG. 2 (the slider assembly is not shown in the figure), in order to increase structural rigidity and strength, the cross-sectional shape of the arm section 1 is rectangular, and at this time the first connecting plate 131 and the second connecting plate 132 are perpendicular to each other.

Referring to FIG. 4 , in some embodiments, in order to take into account both the lightweight of the jib section and the rigidity and strength of the jib section, the first connecting plate 131 is connected to one web 12 , and the second connecting plate 132 is connected to two webs 12 .

In some embodiments, the cross-sectional shape of the main chord 11 is circular. Specifically, the main chord 11 can be a seamless circular tube. Compared with rectangular tubes and L-shaped structures, circular tubes have better load-bearing capacity, fewer welding processes, and high stability of the single limb of the main chord. The specifications of high-strength steel tubes are complete, and they can be highly unified with the material library of conventional crawler cranes. The selection is convenient and reduces cost.

In some embodiments, the connecting point between the first connecting plate 131 and the main chord 11 and the connecting point between the second connecting plate 132 and the main chord 11 passes through the center of the cross-sectional circle of the main chord 11 . Such setting can ensure the same space between two adjacent layers of jib sections and enhance the connection stability between the connecting plate 13 and the main chord 11 . Of course, the connection point between the first connecting plate 131 and the main chord 11 and the connecting point between the second connecting plate 132 and the main chord 11 can also be arranged eccentrically with the center of the cross-sectional circle of the main chord 11 as required. .

Referring to FIGS. 5 and 7 , in some embodiments, the slider assembly 14 includes a mount 141 and a slider body 142 . The slider body 142 is detachably installed on the mounting seat 141 . Specifically, the slider body 142 is used for sliding engagement with the main chord 11 in contact, so that the main chord 11 slides relative to the main chord 11 of the adjacent layer through the slider body 142 . After using for a period of time and need to be replaced, only need to disassemble the slider body 142 from the mounting seat. Further, since the slider assembly 14 is arranged at the end of the main chord 11 , the replacement of the slider body 142 does not need to dismantle the inner jib section 1 , which is simple and convenient.

Still referring to FIG. 5 and FIG. 7 , in some embodiments, the slider assembly 14 further includes a cover plate 143 and a mounting groove 144 . The installation groove 144 is disposed on the installation base 141 . The slider body 142 is placed on the mounting seat 141 through the mounting groove 144 . The cover plate 143 is used to connect with the mounting base 141 after the slider body 142 is placed on the mounting base 141 to cover the notch of the mounting groove 144 and fix the slider body 142 . Specifically, the installation groove 144 is adapted to the shape of the slider body 142 . The cover plate 143 is threadedly connected with the mounting seat 141 to prevent the slider body 142 from sliding in the mounting groove 144 .

3, 8 and 9, in some embodiments, a slider assembly 14 is provided at the top of the main chord of the outermost jib section 1, and at the bottom of the main chord of the innermost jib section 1 A slider assembly 14 is provided, and the top and bottom ends of the main chords of the boom sections 1 of the remaining layers are respectively provided with slider assemblies 14 . The extendable end of the main chord 11 is the top end, and the opposite end of the top end is the bottom end. For an arm segment with a rectangular cross section, four slider assemblies 14 are provided at least one end of any layer of arm segment.

In some embodiments, the slider assembly 14 has a guide surface A. As shown in FIG. The shape of the guide surface A is adapted to the cross-sectional shape of the main chord 11 . The main chord 11 of the inner jib section 1 among the two adjacent jib sections 1 is configured to be slidable relative to the main chord 11 of the outer jib section 1 through the guide surface A. The guide surface A of the slider assembly 14 at the top end of the outermost arm section is set inward. The guide surface A of the slider assembly 14 at the bottom end of the innermost arm section is set outward. The rest of the jib sections are intermediate jib sections. The guide surface A of the slider assembly 14 at the top end of the middle layer arm section is set inwardly. The guide surface A of the slider assembly 14 at the bottom end of the middle layer arm section is set outward.

Specifically, the guide surface A is disposed on the slider body 142 . Mark the slider assembly 14 facing the inner jib section as 14', and mark the slider assembly 14 facing the outer jib section as 14". The slider assembly 14' can guide the matching inner jib section 1 and support to improve structural stability. The two slider assemblies (14' and 14") are configured to match the shape, so that when installing the jib section, the inner jib section can be inserted by removing the slider body 142' And take out operation, disassembly and assembly efficiency is high. Specifically as shown in FIG. 10 , firstly, the cover plate 143 of the slider assembly 14 ′ on the top of the adjacent outer arm section is disassembled, and the slider body 142 ′ is taken out through the installation groove 144 ′. At this time, there is an installation gap between the mounting seat 141' and the slider assembly 14" at the bottom of the adjacent inner arm section. Insert the inner arm section and then install the slider body 142' into the mounting seat 141'. Yes, the status after installation can refer to Figure 8.

The present application also provides a construction machine, including the above-mentioned telescopic truss arm, a luffing mechanism and a base. The first end of the telescopic lattice arm is rotatably connected with the base. The second end of the lattice arm is used for connecting the working mechanism. The luffing mechanism is drivingly connected with the telescopic truss arm to drive the telescopic truss arm to change the amplitude. The boom section of the construction machinery is easy to disassemble and easy to assemble, has a wider range of operation range, and has high efficiency in transition operations.

The construction machine can be a crane.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application and not to limit them; although the present application has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: the present application can still be The specific implementation of the application shall be modified or some technical features shall be equivalently replaced; without departing from the spirit of the technical solution of the application, all of them shall be included in the scope of the technical solution claimed in the application.

Claims (10)

1. A telescopic truss arm, characterized in that the telescopic truss arm includes at least three layers of boom sections (1) that are nested in sequence, and the boom section (1) includes a plurality of boom section surfaces and a slider assembly (14), each section surface includes: Two main chords (11) are arranged in parallel at intervals, and at least one end of the main chords (11) is provided with the slider assembly; a plurality of webs (12) disposed between said two main chords (11); and A plurality of connecting plates (13), the connecting plates (13) connect the web (12) and the main chord (11), the thickness of the connecting plates (13) is smaller than that of the web (12) thickness of. 2. The telescopic lattice arm according to claim 1, characterized in that the connecting plates (13) comprise first connecting plates arranged at different positions in the circumferential direction of the main chord (11) (131) and the second connecting plate (132), the first connecting plate (131) and the second connecting plate (132) are respectively located on two adjacent arm joint surfaces. 3. The telescopic truss arm according to claim 1, characterized in that, the slider assembly (14) includes a mounting seat (141) and a slider body (142), and the slider body (142) is detachable Installed on the mounting base (141). 4. The telescopic lattice arm according to claim 3, characterized in that, the slider assembly (14) further comprises a cover plate (143) and a mounting groove (144), and the mounting groove (144) is arranged on the on the mounting base (141), the slider body (142) is placed on the mounting base (141) through the mounting groove (144), and the cover plate (143) is used for After the (142) is placed on the mounting seat (141), it is connected with the mounting seat (141) to cover the notch of the mounting groove (144) and fix the slider body (142). 5. The telescopic lattice arm according to claim 1, characterized in that the slider assembly (14) is arranged at the top of the main chord of the outermost jib section (1), and the innermost The bottom end of the main chord of the boom section (1) is provided with the slider assembly (14), and the top and bottom ends of the main chord of the boom sections (1) of the remaining layers are respectively provided with the slider assembly ( 14). 6. The telescopic lattice arm according to claim 5, characterized in that, the slider assembly (14) has a guide surface (A), and the shape of the guide surface (A) is the same as that of the main chord (11 ), the main chord (11) of the inner boom section (1) in the two adjacent layers of the boom section (1) is configured to pass through the guide surface (A) relative to the outer layer The main chord (11) of the jib section (1) is slidable, the guide surface (A) of the slider assembly (14) at the top of the outermost jib section is set inward, and the slider assembly at the bottom of the innermost jib section The guide surface (A) of (14) is set outward, and the rest of the arm sections are intermediate arm sections. The guide surface (A) of the slider assembly (14) at the top of the intermediate arm section is set inward, and the intermediate arm section The guide surface (A) of the slider assembly (14) at the bottom of the bottom end is set outwards. 7. The telescopic lattice arm according to claim 1, characterized in that, the cross-sectional shape of the main chord (11) is circular. 8. The telescopic lattice arm according to claim 1, characterized in that, the section shape of the arm section (1) includes a rectangle. 9. The telescopic lattice arm according to claim 1, characterized in that, the cross section of the web (12) is circular. 10. An engineering machine, characterized in that it comprises the telescopic lattice arm according to any one of claims 1 to 9, a luffing mechanism and a base, the first end of the telescopic lattice arm is connected to the base Rotationally connected, the second end of the lattice arm is used to connect to the working mechanism, and the luffing mechanism is drivingly connected with the telescopic lattice arm to drive the telescopic lattice arm to change the amplitude.

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