A slideway assembly of a foldable truss arm, a truss arm and a crane

Abstract

The present disclosure relates to a slide assembly of a foldable truss arm, wherein the truss arm includes a group of symmetrically arranged single-leaf structures with variable cross-sectional states, wherein the single-leaf structure includes a pair of chords and webs, and the slide assembly includes: a sliding portion, fixed to the chord, slidably connected to the web, capable of making the web slide relative to the chord so as to adjust the cross-sectional state of the single-leaf structure; and a stopper, provided on the sliding portion or the chord, capable of limiting the web at a set position. According to the embodiments of the present disclosure, at least the slidable connection between the chord and the web can be made more stable, reducing the overall manufacturing difficulty and manufacturing cost of the truss arm, and enabling the single-leaf structure to be stably maintained in a set cross-sectional state.

Description

Technical Field

[0001] The present disclosure relates to the field of engineering machinery, and in particular to a slideway assembly of a foldable truss arm, a truss arm and a crane. Background Art

[0002] The boom is a structural component widely used in lifting and hoisting equipment to lift heavy objects to a certain height or move a certain distance. As a form of organizational structure of the boom, the truss boom (ledge) is a boom made of steel and pipes welded into a lattice structure, often connected by several sections with bolts or pins to the required length. The truss boom has a light weight, which is conducive to improving the lifting performance of the crane, especially in the case of a large lifting range. And because it can be assembled in sections, it is convenient for the transfer and transportation of the boom and maintenance and replacement. In addition, the reliability of the truss boom lifting process is high, so it accounts for a large proportion of cranes.

[0003] The truss boom is light in weight, which helps to improve the lifting performance of the crane. In order to ensure that the truss boom has sufficient lifting performance and meet the restrictions on the transportation size of the truss boom set by transportation regulations, the relevant truss boom sections often use webs that can slide at both ends to achieve changes in the cross-sectional area of ​​the boom section.

[0004] However, the sliding function of the web rod achieved by conventional slide rails often cannot adapt to the use scenarios of the truss arm, especially in processing scenarios with heavy loads. Conventional slide rails are prone to structural deformation, which in turn leads to failure of the connection between the chord and the web rod. Therefore, it is necessary to design a slide assembly for the deformable truss arm to make the sliding connection between the chord and the web rod more stable, reduce the overall manufacturing difficulty and manufacturing cost of the truss arm, and enable the single-leaf structure to stably maintain a set cross-sectional state. Summary of the invention

[0005] In view of this, the embodiments of the present disclosure provide a slide assembly of a foldable truss arm, a truss arm and a crane, which can make the sliding connection between the chord and the web more stable, reduce the overall manufacturing difficulty and manufacturing cost of the truss arm, and enable the single-leaf structure to stably maintain a set cross-sectional state.

[0006] In one aspect of the present disclosure, a slideway assembly of a foldable truss arm is provided, wherein the truss arm comprises a group of symmetrically arranged single-leaf structures with variable cross-sectional states, wherein the single-leaf structures comprise a pair of chords and webs, and the slideway assembly comprises:

[0007] a sliding portion, fixed to the chord bar and slidably connected to the web bar, enabling the web bar to slide relative to the chord bar so as to adjust the cross-sectional state of the single-sash structure; and

[0008] The stopper is arranged on the sliding part or the chord rod and can limit the web rod at a set position.

[0009] In some embodiments, the single-leaf structure includes at least two web bars, two of the at least two web bars are rotatably hinged to each other via a pin, and the sliding portion includes:

[0010] The sliding groove can accommodate the pin shaft and form a slidable fit with the pin shaft, so that the hinged ends of the two webs hinged to each other move along the extension direction of the sliding groove.

[0011] In some embodiments, the number of the sliding groove is one, both ends of the pin shaft are fixedly disposed on the web, and the pin shaft and the web form a hollow area so that the pin shaft can be slidably disposed in the sliding groove.

[0012] In some embodiments, the number of the sliding grooves is three, two of which are symmetrically arranged on both sides of the pin shaft and partially accommodate the pin shaft respectively, and the web extends from the third sliding groove between the two sliding grooves so that the pin shaft can be slidably connected to the slide rail under the common limit of the three sliding grooves.

[0013] In some embodiments, the two symmetrically arranged sliding grooves are obtained by groove forming from the same sliding portion and are circumferentially closed so that the sliding portion forms a closed connection relative to the pin shaft.

[0014] In some embodiments, the sliding groove is obtained by bending a steel plate or round steel twice along the length direction, and the first short side obtained by the first bending and the second short side obtained by the second bending are fixedly arranged on the chord rod, and the two sliding grooves are spaced apart and arranged in parallel to form two sliding grooves symmetrically arranged in the sliding part.

[0015] In some embodiments, the sliding groove is made of C-shaped steel, and two sliding grooves are arranged on the chord rod in a manner of C-shaped openings facing each other to form the sliding part.

[0016] In some embodiments, the sliding slot is provided with a connection point at the set position, and the stopper comprises:

[0017] A baffle is detachably mounted on the connection point and is capable of limiting the movement of the pin relative to the sliding slot.

[0018] In some embodiments, the slide assembly further comprises:

[0019] The connecting portion is connected between the chord and the sliding portion and is movable relative to the chord and / or the sliding portion along the extension direction of the sliding groove, thereby expanding the slidable range of the web relative to the chord.

[0020] In some embodiments, the slide assembly further comprises:

[0021] A connecting portion, fixedly mounted on the chord rod and connected to the sliding portion, comprising at least two accommodating cavities capable of accommodating the pin shaft;

[0022] The sliding portion further comprises:

[0023] The guide groove is arranged inside the sliding part and is connected to the accommodating cavity and the sliding groove respectively, so that the pin shaft can move from the sliding groove to the accommodating cavity via the guide groove.

[0024] In some embodiments, the sliding portion is installed on a side of the connecting portion away from the chord rod, the sliding groove is arranged inside the sliding portion, and the guide groove is opened inside the sliding portion and close to the connecting portion.

[0025] In some embodiments, the pin shaft is cylindrical, the cylinder includes at least one cross-sectional surface parallel to the axis of the cylinder, the length of the cross-section of the guide groove is greater than the height of the cylinder, the width of the cross-sectional surface of the guide groove is less than the diameter of the cylinder, and the width of the cross-sectional surface of the guide groove is greater than the sum of the distance from the cross-sectional surface to the axis of the cylinder and the radius of the cylinder.

[0026] In yet another aspect of the present disclosure, there is provided a truss arm, comprising a slideway assembly as described in any of the above embodiments, wherein the single-leaf structure comprises at least two cross-sectional states;

[0027] In any of the cross-sectional states, the stop portion can limit the web at a set position, and a first angle is formed between the chord and the web connected by the same slide assembly, and a second angle is formed between the length direction of the guide groove and the chord, and the first angle is equal to the second angle.

[0028] In another aspect of the present disclosure, a truss arm is provided, comprising a slide assembly as described in any of the foregoing embodiments, wherein the truss arm comprises two groups of symmetrically arranged single-leaf structures with variable cross-sectional states, any single-leaf structure is perpendicular to any single-leaf structure in the other group of single-leaf structures, and the two single-leaf structures perpendicular to each other are arranged on the same chord.

[0029] In some embodiments, along the length direction of the truss arm, there is a set distance between the two single-leaf structures arranged on the same chord.

[0030] In some embodiments, the connecting portion is at least partially buried inside the chord rod, or the connecting portion and the sliding portion are at least partially buried inside the chord rod;

[0031] The chord comprises:

[0032] The first flange and the second flange, whose protruding directions are respectively toward the two single-leaf structures that are perpendicular to each other, can at least partially bury the connecting part, or at least partially bury the connecting part and the sliding part, and the thickness of the first flange and the second flange is greater than the burying depth of the connecting part, or greater than the burying depth of the connecting part and the sliding part.

[0033] In yet another aspect of the present disclosure, a crane is provided, comprising a slideway assembly as described above.

[0034] Therefore, according to the embodiment of the present disclosure, at least the slidable connection between the chord and the web can be made more stable, the overall manufacturing difficulty and cost of the truss arm can be reduced, and the single-leaf structure can be stably maintained in a set cross-sectional state. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings, which constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0036] The present disclosure may be more clearly understood from the following detailed description with reference to the accompanying drawings, in which:

[0037] Figure 1 is a schematic structural diagram of a single-leaf structure of a foldable truss arm according to some embodiments of the present disclosure;

[0038] Figure 2 is a schematic structural diagram of a slide assembly of a foldable truss arm according to some embodiments of the present disclosure;

[0039] Figure 3 is a schematic structural diagram of a slide assembly of a foldable truss arm according to some embodiments of the present disclosure;

[0040] Figure 4 is a schematic structural diagram of a slide assembly of a foldable truss arm according to some embodiments of the present disclosure;

[0041] Figure 5 is a schematic diagram of a three-dimensional structure of a slide assembly of a foldable truss arm according to some embodiments of the present disclosure;

[0042] Figure 6 is based on Figure 5 A schematic cross-sectional view of a slide assembly of a foldable truss arm according to some embodiments of the present disclosure is shown;

[0043] Figure 7 is based on Figure 5 A schematic side view of the structure of a slide assembly of a foldable truss arm of some embodiments of the present disclosure is shown;

[0044] Figure 8 is a schematic diagram of a three-dimensional structure of a slide assembly of a foldable truss arm according to some embodiments of the present disclosure;

[0045] Fig. 9 is based on Figure 8 A schematic cross-sectional view of a slide assembly of a foldable truss arm according to some embodiments of the present disclosure is shown;

[0046] Fig.10 is based on Figure 8 A schematic side view of the structure of a slide assembly of a foldable truss arm of some embodiments of the present disclosure is shown;

[0047] Fig.11 is a schematic diagram of the three-dimensional structure of a slide assembly of a foldable truss arm in a first state according to some embodiments of the present disclosure;

[0048] Fig.12 is based on Fig.11 A schematic cross-sectional view of a slide assembly of a foldable truss arm in a first state according to some embodiments of the present disclosure is shown;

[0049] Fig.13 is a schematic diagram of the three-dimensional structure of a slide assembly of a foldable truss arm in a first state according to some embodiments of the present disclosure;

[0050] Fig.14 is based on Fig.13 A schematic cross-sectional view of a slide assembly of a foldable truss arm in a first state according to some embodiments of the present disclosure is shown;

[0051] Fig.15 is a schematic diagram of the three-dimensional structure of a slide assembly of a foldable truss arm in a first state according to some embodiments of the present disclosure;

[0052] Fig.16 is based on Fig.15 A schematic cross-sectional view of a slide assembly of a foldable truss arm in a first state according to some embodiments of the present disclosure is shown;

[0053] Fig.17 is a schematic diagram of a three-dimensional structure of a foldable truss arm in a working state according to some embodiments of the present disclosure;

[0054] Fig.18 is based on Fig.17 A schematic structural diagram of a single-leaf structure of a foldable truss arm in a working state in some embodiments of the present disclosure is shown;

[0055] Fig.19 is based on Fig.17 A schematic diagram of the structure of a foldable truss arm of some embodiments of the present disclosure in a side view in a working state;

[0056] Fig. 20 is a schematic diagram of a three-dimensional structure of a foldable truss arm in a transport state according to some embodiments of the present disclosure;

[0057] Fig.21 is based on Fig. 20 A schematic structural diagram of a single-leaf structure of a foldable truss arm in a transport state according to some embodiments of the present disclosure is shown;

[0058] Fig. 22 is based on Fig. 20 A schematic structural diagram of a foldable truss arm of some embodiments of the present disclosure in a side view in a transport state.

[0059] In the figure:

[0060] 1. Single-leaf structure, 2. Chord, 21. First flange, 22. Second flange, 3. Web, 31. Pin, 311. Cutting surface, 4. Sliding portion, 41. Sliding groove, 42. Guide groove, 5. Stop portion, 51. Baffle, 52. Accommodating cavity, 6. Connecting portion.

[0061] It should be understood that the size of each part shown in the accompanying drawings is not drawn according to the actual proportional relationship. In addition, the same or similar reference numerals represent the same or similar components. DETAILED DESCRIPTION

[0062] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the present disclosure and its application or use. The present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present disclosure thorough and complete and to fully express the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the components and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary and not as limiting.

[0063] The words "first", "second" and similar words used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. The words "include" or "comprise" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0064] In the present disclosure, when a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device. When a specific device is described as being connected to other devices, the specific device may be directly connected to the other device without an intermediate device, or may not be directly connected to the other device but have an intermediate device.

[0065] All terms (including technical terms or scientific terms) used in the present disclosure have the same meanings as those understood by ordinary technicians in the field to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, such as general dictionaries, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0066] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0067] like Figures 1 to 22 As shown: In one aspect of the present disclosure, a slideway assembly of a foldable truss arm is provided, wherein the truss arm comprises a set of symmetrically arranged single-leaf structures 1 with variable cross-sectional states, wherein the single-leaf structures 1 comprise a pair of chords 2 and webs 3, and the slideway assembly comprises:

[0068] a sliding portion 4, fixed to the chord bar 2, and slidably connected to the web bar 3, so that the web bar 3 can slide relative to the chord bar 2, so as to adjust the cross-sectional state of the single-sash structure 1; and

[0069] The stopper 5 is provided on the sliding part 4 or the chord rod 2 and can limit the web rod 3 to a set position.

[0070] The cross-sectional state of the single-leaf structure 1 refers to the area sandwiched between a pair of chords 2 constituting the single-leaf structure 1. The cross-sectional state is adjustable to adapt to the use requirements of the truss arm in different scenarios: adjusting to a smaller cross-sectional state in the transportation state to obtain stronger passability, and adjusting to a larger cross-sectional state in the working state to obtain stronger bearing capacity.

[0071] In order for the single-leaf structure 1 to stably maintain the optimal cross-sectional state corresponding to different scenes, the stopper 5 can limit the web bar 3 to a set position. The set position can be preset at the factory or set in an adjustable form to make the single-leaf structure 1 more flexible during adjustment.

[0072] like Figures 1 to 10 As shown, in some embodiments, the single-leaf structure 1 includes at least two web bars 3, two of the at least two web bars 3 are rotatably hinged to each other through a pin 31, and the sliding portion 4 includes:

[0073] The sliding groove 41 can accommodate the pin shaft 31 and form a slidable fit with the pin shaft 31 so that the hinged ends of the two hinged webs 3 move along the extending direction of the sliding groove 41 .

[0074] When two of the two web members 3 are rotatably hinged to each other through the pin 31, the slidable connection between the chord 2 and the web member 3 is converted into a slidable connection between the sliding groove 41 and the pin 31. At this time, the sliding direction of the pin 31 can be controlled by the opening direction of the sliding groove 41, thereby making the two hinged web members 3 slide along the opening direction of the sliding groove 41.

[0075] like Figures 8 to 10 As shown, further, in some embodiments, the number of the sliding groove 41 is one, both ends of the pin shaft 31 are fixedly set on the belly rod 3, and the pin shaft 31 and the belly rod 3 form a hollow area so that the pin shaft 31 can be slidably set in the sliding groove 41.

[0076] The hollow area formed by the pin shaft 31 and the web member 3 is used to allow one groove edge of the sliding groove 41 to pass through, thereby limiting the slidable range of the pin shaft 31 relative to the sliding groove 41. For example, the size of the hollow area formed between the pin shaft 31 and the web member 3 may be only slightly larger than the size of one groove edge of the sliding groove 41 passing through the hollow area, so that during the sliding process of the pin shaft 31 along the sliding groove 41, no shaking occurs in directions other than the opening direction of the sliding groove 41, thereby increasing the stability of the single-sash structure 1 during the change of the cross-sectional state.

[0077] like Figures 5 to 7As shown, further, in some embodiments, the number of the sliding grooves 41 is three, two of which are symmetrically arranged on both sides of the pin shaft 31 and partially accommodate the pin shaft 31 respectively, and the web 3 extends from the third sliding groove 41 between the two sliding grooves 41, so that the pin shaft 31 can be slidably connected to the slide rail under the common limit of the three sliding grooves 41.

[0078] The web 3 extends from the third sliding groove 41 between the two sliding grooves 41 , and the third sliding groove 41 is located between the two symmetrical sliding grooves 41 , so that the forces on the two symmetrical sliding grooves 41 are more balanced.

[0079] The two symmetrical sliding grooves 41 are used to accommodate the pin 31, so that the contact area between the pin 31 and the sliding part 4 can be flexibly increased according to demand. For example, when the load-bearing requirement of the truss arm is high, the sliding groove 41 with an open structure is selected, and the pin 31 with a corresponding length is matched, so that the contact area between the sliding groove 41 and the pin 31 can be expanded, thereby reducing the local pressure of the sliding groove 41 and the pin 31, and improving the stability of the slidable connection between the web member 3 and the chord member 2.

[0080] Further, such as Figure 2 As shown, in order to increase the sensitivity of the sliding portion 4 to the external environment and prevent external debris from invading the sliding groove 41 and causing an adverse effect on the connection between the web member 3 and the chord member 2, in some embodiments, the two symmetrically arranged sliding grooves 41 are obtained by grooving the same sliding portion 4 and are circumferentially closed so that the sliding portion 4 forms a closed connection relative to the pin shaft 31.

[0081] Further, such as Figure 3 As shown, in order to reduce the processing difficulty and cost of the sliding groove 41, in some embodiments, the sliding groove 41 is obtained by bending a steel plate or round steel twice along the length direction, and the first short side obtained by the first bending and the second short side obtained by the second bending are fixedly arranged on the chord 2, and the two sliding grooves 41 are spaced apart and arranged in parallel to form two sliding grooves 41 symmetrically arranged in the sliding part 4.

[0082] Furthermore, in order to reduce the processing cost and material cost of the sliding groove 41 while ensuring the structural strength, in some embodiments, the sliding groove 41 is formed of C-shaped steel, and two sliding grooves 41 are arranged on the chord rod 2 in a C-shaped opening relative to each other to form the sliding part 4.

[0083] Further, such as Figure 4As shown, in order to enable the web member 3 to be fixed at a set position relative to the chord member 2, in some embodiments, the sliding groove 41 is provided with a connection point at the set position, and the stopper 5 includes:

[0084] The baffle 51 is detachably mounted on the connection point and can limit the movement of the pin 31 relative to the sliding slot 41 .

[0085] The baffle 51 is detachably mounted on the connection point, and when the single-leaf structure 1 is in a transport state or in a working state, the pin shaft 31 can be restricted to the corresponding connection point respectively. When the single-leaf structure 1 is in an intermediate state between the transport state and the working state, the restriction on the pin shaft 31 can be released, so that the web member 3 can slide freely relative to the chord member 2.

[0086] Furthermore, in order to increase the sliding range of the web member 3 relative to the chord member 2, in some embodiments, the slideway assembly further includes:

[0087] The connecting portion 6 is connected between the chord 2 and the sliding portion 4 and is movable relative to the chord 2 and / or the sliding portion 4 along the extending direction of the sliding groove 41 , thereby expanding the slidable range of the web member 3 relative to the chord 2 .

[0088] Further, such as Figures 11 to 16 As shown, in some embodiments, the slide assembly further includes:

[0089] The connecting portion 6 is fixedly mounted on the chord rod 2 and connected to the sliding portion 4, and includes at least two accommodating cavities 52 capable of accommodating the pin shaft 31;

[0090] The sliding portion 4 further includes:

[0091] The guide groove 42 is disposed inside the sliding portion 4 and is connected to the accommodating cavity 52 and the sliding groove 41 , respectively, so that the pin shaft 31 can move from the sliding groove 41 to the accommodating cavity 52 via the guide groove 42 .

[0092] in, Figures 11-12 The three-dimensional structure of the slideway assembly in the first state is shown. In this state, the pin shaft 31 is located in the sliding groove 41 of the sliding portion 4, so that the pin shaft 31 can continue to move relative to the sliding groove 41, corresponding to the intermediate state between the single-sash structure 1 in the transport state and the working state;

[0093] Figures 13-14The three-dimensional structure of the slideway assembly in the second state is shown. In this state, the pin shaft 31 is located in the guide groove 42 of the sliding portion 4, restricting the pin shaft 31 to move only toward the accommodating cavity 52 or toward the sliding groove 41, so that the cross-sectional state of the single-sash structure 1 is adjustable or the cross-sectional state is restricted;

[0094] and Figures 15-16 The three-dimensional structure of the slide assembly in the third state is shown. In this state, the pin shaft 31 is located in the accommodating cavity 52 of the connecting portion 6, limiting the movement of the pin shaft 31, so that the cross-sectional state of the single-leaf structure 1 is limited to being in a transport state or a working state.

[0095] Since the single-leaf structure 1 is either in working state or in transport state for a long time in a working cycle, and the intermediate state time between the working state and the transport state is short, the structure of the slide assembly should consider the structural stability of the single-leaf structure 1 in working state or in transport state more, especially the stability under the large load state in working state. In some embodiments, the sliding part 4 is installed on the side of the connecting part 6 away from the chord 2, the sliding groove 41 is arranged inside the sliding part 4, and the guide groove 42 is opened inside the sliding part 4 and close to the connecting part 6.

[0096] Compared to Figure 4 The stop portion 5 in the form of the baffle 51 shown has a higher structural strength with the accommodating cavity 52 located inside the connecting portion 6 as the stop portion 5, thereby adapting to the connection strength requirements of the single-leaf structure 1 in the transportation state and the working state; and the sliding groove 41 located inside the accommodating cavity 52 serves as the load-bearing structure of the single-leaf structure 1 in the intermediate state between the transportation state and the working state, which ensures the strength of the sliding groove 41 without causing adverse effects on the structure of the stop portion 5, so that the structural form of the sliding groove 41 inside the outer stop portion 5 satisfies both the functional requirements of the slide assembly and the structural strength requirements between the chord 2 and the web 3.

[0097] Furthermore, when the sliding groove 41 is located inside the sliding portion 4 and the accommodating cavity 52 is located inside the connecting portion 6, the guide groove 42 is opened on the side of the sliding portion 4 close to the connecting portion 6, so that the two internal structures of the sliding groove 41 and the accommodating cavity 52 can be connected to each other, thereby facilitating the position change of the pin shaft 31 between the sliding groove 41 and the accommodating cavity 52 while ensuring the structural strength of both.

[0098] Furthermore, in order to enable the pin shaft 31 to be stably accommodated in the accommodating cavity 52, in some embodiments, the pin shaft 31 is cylindrical, and the cylinder includes at least one cross-sectional surface 311 parallel to the axis of the cylinder, the length of the cross-section of the guide groove 42 is greater than the height of the cylinder, the width of the cross-sectional surface of the guide groove 42 is smaller than the diameter of the cylinder, and the width of the cross-sectional surface of the guide groove 42 is greater than the sum of the distance from the cross-sectional surface 311 to the axis of the cylinder and the radius of the cylinder.

[0099] The cross-sectional shapes of the cutting surface 311 and the guide groove 42 are set so that the pin 31 can only move in the guide groove 42 at a specific angle (that is, the cutting surface 311 is parallel to the guide groove 42). Therefore, once the pin 31 enters the accommodating cavity 52 and the angle of the web member 3 relative to the slide assembly changes due to the external load, the pin 31 is locked in the accommodating cavity 52, so that the single-sash structure 1 is restricted to a set cross-sectional state.

[0100] In order to make the pin shaft 31 leave the accommodating cavity 52, it is necessary to overcome the external load of the web 3 so that the cross-section 311 of the pin shaft 31 can be realigned and overlapped with the inner wall surface of the guide groove 42, so that the pin shaft 31 can return to the sliding groove 41 through the guide groove 42.

[0101] Furthermore, in order to ensure that the single-leaf structure 1 can correctly enter the accommodating cavity 52 at the opening position of the accommodating cavity 52 and lock the cross-sectional state when there is a restriction on the angle at which the pin shaft 31 enters the guide groove 42, in another aspect of the present disclosure, a truss arm is provided, comprising the slideway assembly as described in any of the above embodiments, wherein the single-leaf structure 1 comprises at least two cross-sectional states;

[0102] In any of the cross-sectional states, the stop portion 5 can limit the web 3 to a set position, and a first angle is formed between the chord 2 and the web 3 connected by the same slide assembly, and a second angle is formed between the length direction of the guide groove 42 and the chord 2, and the first angle is equal to the second angle.

[0103] Further, such as Figures 17 to 22 As shown, in another aspect of the present disclosure, a truss arm is provided, comprising a slide assembly as described in any of the foregoing embodiments, wherein the truss arm comprises two groups of symmetrically arranged single-leaf structures 1 with variable cross-sectional states, any single-leaf structure 1 being perpendicular to any single-leaf structure 1 in another group of the single-leaf structures 1, and the two single-leaf structures 1 perpendicular to each other are arranged on the same chord 2.

[0104] The two groups of symmetrically arranged single-leaf structures 1 with variable cross-sectional states that are perpendicular to each other can further expand the volume variation range of the truss arm, so that it is convenient to transport with a smaller volume size in the transport state, and bear the load with a larger volume size in the working state.

[0105] Since the same chord 2 will be provided with two single-leaf structures 1 perpendicular to each other, the stress condition of the chord 2 becomes more complicated, especially when the connecting portion 6 and / or the sliding portion 4 are partially provided on the chord 2, the strength of the chord 2 will be further affected. Therefore, in some embodiments, a set spacing is provided between the two single-leaf structures 1 provided on the same chord 2 along the length direction of the truss arm.

[0106] The set spacing between the two single-leaf structures 1 makes the areas where the two connecting parts 6 and / or the sliding parts 4 are buried on the chord 2 no longer overlap, ensuring that the chord 2 has a certain minimum cross-sectional area, thereby improving the overall strength of the chord 2.

[0107] Furthermore, in some embodiments, the connecting portion 6 is at least partially buried inside the chord rod 2, or the connecting portion 6 and the sliding portion 4 are at least partially buried inside the chord rod 2;

[0108] In order to prevent the connection part 6 at least partially buried in the chord bar 2, or the connection part 6 and the sliding part 4 from affecting the structural strength of the chord bar 2, the chord bar 2 includes:

[0109] The first flange 21 and the second flange 22, with protruding directions respectively facing the two single-leaf structures 1 perpendicular to each other, can at least partially bury the connecting part 6, or at least partially bury the connecting part 6 and the sliding part 4, and the thickness of the first flange 21 and the second flange 22 is greater than the burying depth of the connecting part 6, or greater than the burying depth of the connecting part 6 and the sliding part 4.

[0110] In yet another aspect of the present disclosure, a crane is provided, comprising a slideway assembly as described above.

[0111] Therefore, according to the embodiment of the present disclosure, at least the slidable connection between the chord 2 and the web 3 can be made more stable, the overall manufacturing difficulty and manufacturing cost of the truss arm can be reduced, and the single-leaf structure 1 can be stably maintained in a set cross-sectional state.

[0112] So far, various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0113] Although some specific embodiments of the present disclosure have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A slideway assembly of a foldable truss arm, the truss arm comprising a set of symmetrically arranged single-leaf structures with variable cross-sectional states, the single-leaf structures comprising a pair of chords and webs, characterized in that: The slide assembly comprises: a sliding portion, fixed to the chord rod and slidably connected to the web rod, enabling the web rod to slide relative to the chord rod so as to adjust the cross-sectional state of the single-sash structure; and A stopper, provided on the sliding portion or the chord rod, capable of limiting the web rod at a set position; Wherein, the single-leaf structure comprises at least two web bars, two of the at least two web bars are rotatably hinged to each other through a pin, and the sliding portion comprises: A sliding groove, capable of accommodating the pin shaft and forming a slidable fit with the pin shaft, so that the hinged ends of the two hinged webs move along the extending direction of the sliding groove; The slide assembly also includes: A connecting portion, fixedly mounted on the chord rod and connected to the sliding portion, comprising at least two accommodating cavities capable of accommodating the pin shaft; and The guide groove is arranged inside the sliding part and is connected to the accommodating cavity and the sliding groove respectively, so that the pin shaft can move from the sliding groove to the accommodating cavity via the guide groove.

2. The slideway assembly according to claim 1, characterized in that: The number of the sliding groove is one, and both ends of the pin shaft are fixedly arranged on the web rod, and the pin shaft and the web rod form a hollow area so that the pin shaft can be slidably arranged in the sliding groove.

3. The slideway assembly according to claim 1, characterized in that: There are three sliding grooves, two of which are symmetrically arranged on both sides of the pin shaft and partially accommodate the pin shaft respectively, and the web extends from the third sliding groove between the two sliding grooves so that the pin shaft can be slidably connected to the sliding groove under the common limit of the three sliding grooves.

4. The slideway assembly according to claim 3, characterized in that: The two symmetrically arranged sliding grooves are obtained by groove forming from the same sliding portion and are circumferentially closed so that the sliding portion forms a closed connection relative to the pin shaft.

5. The slideway assembly according to claim 3, characterized in that: The sliding groove is obtained by bending a steel plate or round steel twice along the length direction. The first short side obtained by the first bending and the second short side obtained by the second bending are fixedly arranged on the chord rod. The two sliding grooves are spaced apart and arranged in parallel to form two sliding grooves symmetrically arranged in the sliding part.

6. The slideway assembly according to claim 3, characterized in that: The sliding groove is made of C-shaped steel, and two sliding grooves are arranged on the chord rod in a manner of C-shaped openings facing each other to form the sliding part.

7. The slideway assembly according to claim 1, characterized in that: The sliding groove is provided with a connection point at the set position, and the stopper comprises: A baffle is detachably mounted on the connection point and is capable of limiting the movement of the pin relative to the sliding slot.

8. The slideway assembly according to claim 1, characterized in that: The sliding part is installed on a side of the connecting part away from the chord rod, the sliding groove is arranged inside the sliding part, and the guiding groove is opened inside the sliding part and close to the connecting part.

9. The slideway assembly according to claim 8, characterized in that: The pin shaft is cylindrical, and the cylinder includes at least one cross-sectional surface parallel to the axis of the cylinder. The length of the cross-section of the guide groove is greater than the height of the cylinder, the width of the cross-sectional surface of the guide groove is less than the diameter of the cylinder, and the width of the cross-sectional surface of the guide groove is greater than the sum of the distance from the cross-sectional surface to the axis of the cylinder and the radius of the cylinder.

10. A truss arm, comprising the slideway assembly according to claim 8 or 9, characterized in that: The single-sash structure includes at least two cross-sectional states; In any of the cross-sectional states, the stop portion can limit the web at a set position, and a first angle is formed between the chord and the web connected by the same slide assembly, and a second angle is formed between the length direction of the guide groove and the chord, and the first angle is equal to the second angle.

11. A truss arm, characterized in that: It comprises a slide assembly as described in any one of claims 1 to 9, wherein the truss arm comprises two groups of symmetrically arranged single-leaf structures with variable cross-sectional states, any single-leaf structure is perpendicular to any single-leaf structure in the other group of single-leaf structures, and the two single-leaf structures perpendicular to each other are arranged on the same chord.

12. The truss arm according to claim 11, characterized in that Along the length direction of the truss arm, there is a set distance between the two single-leaf structures arranged on the same chord.

13. The truss arm according to claim 11, characterized in that: The connecting portion is at least partially buried inside the chord rod, or the connecting portion and the sliding portion are at least partially buried inside the chord rod; The chord comprises: The first flange and the second flange, whose protruding directions are respectively toward the two single-leaf structures that are perpendicular to each other, can at least partially bury the connecting part, or at least partially bury the connecting part and the sliding part, and the thickness of the first flange and the second flange is greater than the burying depth of the connecting part, or greater than the burying depth of the connecting part and the sliding part.

14. A crane, characterized in that: It comprises a slide assembly as described in any one of claims 1 to 9.

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