THE LOAD-BEARING STRUCTURE OF THE CABLE CAR CABIN

Abstract

The utility model relates to transport engineering, in particular to cable car cabins, and more specifically to supporting structures of cable car cabins. A supporting structure for a cable car cabin is proposed, which comprises a rectangular base, realized in the form of a frame consisting of longitudinal 1 and transverse 2 spars made of rectangular profile duralumin tubes, connected to each other. The load-bearing elements are realized in the form of equal-sized vertical tubular struts 3 made of 30KhGSA alloy steel with external threads 4 and 5 at their ends, and are secured to the longitudinal spars using a fastening element 6. The struts on the spars are placed at an equal distance from the center of the base to ensure the possibility of subsequent connection of the supporting structure to the mechanism for connecting the cabin to the cable car cable.The supporting structure of the cable car cabin with central power columns allows for the construction of cabins of various sizes and designs, as the cabin's supporting structure is not connected to its frame, which in this case merely supports the cabin's external shape. The objective of the proposed technical solution is to improve the functional characteristics of cable car cabins without compromising the vehicle's operational safety. 3 fig.

Description

[0001] The device relates to transport engineering, in particular to cable car cabins, namely to the supporting structures of cable car cabins.

[0002] The supporting structure of the cabin (car) is a structural element of the vehicle that must withstand and distribute the loads acting on the cabin associated with the mass of components and assemblies, passengers and cargo during movement, operation or in emergency situations.

[0003] A supporting structure for a cable car cabin is known, comprising a rectangular base, load-bearing elements of the supporting structure and fastening elements with the possibility of bolting the device to the coupling mechanism of the cabin with the cable car cable (see Russian Federation Patent No. 22772495, IPC B61B 7 / 00, published 05 / 23 / 2022, Bulletin No. 15).

[0004] In the well-known technical solution, as is commonly accepted, the tubular frame of the cabin, encircling its perimeter from the base to the roof, serves as the load-bearing element of the supporting structure. In the section of the frame adjacent to the cabin roof, studs are rigidly installed through the roof, allowing the cabin's rope-based movement mechanism to be bolted to the frame.

[0005] The device meets the safety requirements for the rolling stock of single-rope circular passenger cableways.

[0006] However, the existing design has a number of significant drawbacks. For example, with the space-frame design, most of the control points for the load-bearing frame are hidden by the interior and exterior cabin panels, complicating and increasing the time required to perform frame inspections. Furthermore, when transmitting force from the upper to the lower attachment points through the space frame, the presence of complex geometric components makes it difficult to ensure the necessary safety factor to ensure the specified cabin shape. Consequently, the weight of the structure increases, limiting the potential for increasing the number of passengers and the volume of their sports equipment. Furthermore, the cabin design is dependent on the frame shape, which, overall, limits the prospects for improving passenger comfort and safety.

[0007] The objective of the proposed technical solution is to improve the functional characteristics of cable car cabins without deteriorating the safety performance of the vehicle.

[0008] The stated problem is solved by the proposed supporting structure of a cable car cabin, containing a rectangular base, load-bearing elements of the supporting structure and fastening elements, with the possibility of a bolted connection of the device with the mechanism for coupling the cabin with the cable car rope, wherein the base is made in the form of a frame consisting of longitudinal and transverse spars made of rectangular profile duralumin pipes, the load-bearing elements are made in the form of equal-sized vertical tubular struts made of alloy steel with external threads at their ends, and the fastening element consists of a housing made of alloy steel, in which a threaded hole is made for screwing in the supporting strut and a cavity equal in shape and dimensions to the profile of the longitudinal spar, for installing the housing of the fastening element on the spar and a plate fastened with screws to the housing of the fastening element, and tightly closing this cavity, wherein the struts on the spars are placed at an equal distance from the center of the base.

[0009] According to the proposed technical solution, the cable car cabin's load-bearing central pillar design offers a significant advantage over existing designs, offering high safety factors thanks to axial force transmission and a minimal number of components involved in this transmission. The choice of four supporting elements is technically driven by the need to ensure the strength and reliability of the device, and from a practical perspective, by the need to minimize potential inconvenience to cabin occupants.Improved operational and functional properties are achieved through the ease of use of the cabin, as the attachment points of the central power strut at the top and bottom are accessible for visual and / or instrumental inspection, which reduces maintenance time and makes it possible to increase the frequency of inspection of critical attachment points, thereby increasing the safety of transportation, while reducing the requirements for the spatial frame and cladding, which has a positive effect on the reduction of the overall weight of the cabin and expands the possibilities for the diversity of its design.

[0010] Fig. 1 shows a 3D model of the supporting structure of a cable car cabin with central tubular power struts. An enlarged view shows the installation of a fastening element on a longitudinal member.

[0011] Fig. 2 - the attachment unit of the central power strut to the longitudinal side member.

[0012] Fig. 3 - 3D model of the supporting structure of the cable car cabin, including a possible mechanism for connecting the cabin to the cable and an option for installing the cabin frame.

[0013] The proposed supporting structure is illustrated by an example of execution.

[0014] The supporting structure of the cable car cabin contains a rectangular base 2300 mm long and 2100 mm wide, made in the form of a frame (Fig. 1), consisting of longitudinal 1 and transverse 2 spars connected to each other from rectangular duralumin profile pipes measuring 100 × 50 mm with a wall thickness of 5 mm, the power elements are made in the form of equal-sized vertical tubular posts 3 with a diameter of 30 mm with a wall thickness of 5 mm made of alloy steel 30KhGSA with external threads 4 and 5 at their ends with a thread length of 65 mm, and the fastening element 6 consists of a housing 7 (Fig.2) made of alloy steel 30KhGSA, in which a threaded hole 8 is made for screwing in a supporting post and a cavity 9, equal in shape and dimensions to the profile of the longitudinal spar, for installing the body of the fastening element on the spar, and a plate 10, fastened with screws 11 to the body of the fastening element, and tightly closing this cavity, wherein the posts on the side members are placed at an equal distance from the center of the base in the corners of the outlined rectangle with a distance along the length and width between the axes of 1000 and 900 mm, to ensure the possibility of subsequent connection of the supporting structure with the mechanism "M" for connecting the cabin with the cable car cable (Fig. 3) and the permissibility of the manufacture and installation of the spatial frame "K" of the cabin, the dimensions and design of which do not depend on the placement of the power elements.

[0015] The supporting structure of the cable car cabin is prepared for operation as follows.

[0016] Longitudinal 1 and transverse 2 side members are assembled into a rectangular axially symmetrical spar frame, which forms the base of the cabin's supporting structure. A power system with four base suspension points on power struts equidistant from the center of gravity ensures stable system equilibrium, distributes loads, and controls the plane's position in space, minimizing the risk of tipping or deformation. The center of gravity of the rectangular axially symmetrical frame is its geometric center—the intersection of the longitudinal and transverse axes. Points located on the longitudinal side members, equidistant from the center of the base, determine the coordinates of the vertical axes of tubular power struts 3. Fastener 6 is used for their installation; it is mounted on the longitudinal side member by gripping it with cavity 9 in housing 7 of the fastener and fixing this position with plate 10, which is secured to the housing with screws 11.After this, tubular posts with the corresponding threaded end 5 are screwed into the threaded holes 8 in the housings of the fastening elements. Threaded ends 4 on the free ends of the vertical tubular posts provide the ability to connect the supporting structure with the mechanism for connecting the cabin to the cable car cable.

[0017] The supporting structure of the cable car cabin with central power pillars allows for the construction of cabins of various sizes and different designs, since the power part of the cabin is not connected to its frame, which in this case only supports the outer shape of the cabin.

[0018] To evaluate the strength and safety of cabins using the proposed supporting structure with central power columns, full-scale bench tests were conducted in a specialized laboratory. Three samples of threaded connections between the supporting column attachment unit and the cable car body were submitted for testing (see Fig. 3). Test method: tensile test load. Test objective: determining the breaking load. The tests were conducted on a calibrated testing machine. Environmental conditions: humidity - 30%, air temperature - 17.1°C.

[0019] Test results: static test load per column 1000kg - passed the test; the verification maximum static test load for thread failure per column was 23000kg.

[0020] Thus, the supporting structures of the cabin comply with the first and second groups of limit states according to GOST 27751-2014 and the regulatory provisions of the European standard EN 13223:2015 "Safety requirements for passenger cableway devices. Drive systems and other mechanical equipment."

[0021] The use of the proposed design improves the operational and functional characteristics of cable car cabins.

Claims

A supporting structure for a cable car cabin comprising a rectangular base, load-bearing elements of the supporting structure and fastening elements with the possibility of bolting the device to a coupling mechanism of the cabin with the cable car rope, characterized in that the base is made in the form of a frame consisting of longitudinal and transverse spars made of rectangular duralumin profile pipes, the load-bearing elements are made in the form of equal-sized vertical tubular posts made of alloy steel with external threads at their ends, and the fastening element consists of a housing made of alloy steel in which a threaded hole is made for screwing in the supporting post and a cavity equal in shape and dimensions to the profile of the longitudinal spar for mounting the housing of the fastening element on the spar, and a plate fastened with screws to the housing of the fastening element and tightly closing this cavity, with the possibility of rigid coupling of the fastening element with the longitudinal spar,in this case, the racks on the side members are placed at an equal distance from the center of the base,

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