Anti-falling cantilever structure for railway contact net
By introducing a combination of straight rods and arc-shaped grooves into the cantilever structure, the problems of stress concentration and insufficient limiting under lateral force in existing cantilever structures are solved, load dispersion and angle limitation are achieved, and the stability of the cantilever and the safe operation of the contact network system are improved.
Patent Information
- Application Number
- CN202520760406.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-21
- Publication Date
- 2026-02-13
- Estimated Expiration
- 2035-04-21
AI Technical Summary
Existing cantilever structures are prone to lateral displacement under lateral forces such as wind loads, leading to stress concentration at the edge of the ear hole. After long-term operation, this can easily cause crack propagation and fatigue fracture. Furthermore, the lack of an effective limiting mechanism increases the risk of wire derailment and affects the safety and reliability of the overhead contact system.
The structure combines a straight rod and an arc groove. The load is distributed through the contact surface of the pin and the arc groove, forming a multi-path load distribution. The arc groove guides and limits the straight rod, restricting the lateral swing angle of the cantilever arm and preventing the expansion and detachment of hole wall cracks.
It effectively disperses the concentrated load, prevents the propagation of hole wall cracks and fatigue fracture, avoids the detachment of the cantilever arm and separation from the contact wire, and improves the service life of the cantilever arm structure and the safety of the contact wire system.
Smart Images
Figure CN223904914U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to railway overhead line system technical field, concretely relates to a prevent type railway overhead line system wrist arm structure. BACKGROUND
[0002] In the railway overhead line system, the wrist arm structure as the key component of support and connection, its stability directly influences the reliability of overhead line system and train operation safety. However, the existing wrist arm structure still has certain technical defects in actual operation, and needs to be optimized and improved.
[0003] The traditional wrist arm structure usually adopts the hinge mode of pin shaft and lug plate to realize the rotating function, and its structure is simple but has obvious defects. Under the action of wind load and other lateral forces, the wrist arm is easy to have lateral deviation, and the lug hole edge of the mounting lug plate produces serious local stress concentration. Because the railway overhead line is in high-frequency micro-amplitude vibration working condition for a long time, the hole wall is easy to generate cracks and gradually expand under the action of cyclic stress, finally causes metal fatigue fracture, and even leads to wrist arm falling off, seriously threatens the safe operation of the overhead line system. In addition, under the extreme environment such as strong wind, if the wrist arm lateral swing amplitude exceeds the design range, it may cause the wrist arm to separate from the contact line, cause power supply interruption, and further affect the normal operation of the train, and even cause safety accidents.
[0004] In the prior art, the load transmission of the wrist arm structure mainly depends on the single contact surface of the pin shaft and the lug hole, so that the stress is relatively concentrated, and the wear and fatigue damage of the contact part is easy to be aggravated after long-term operation, and the service life of the structure is shortened. At the same time, the traditional structure lacks effective limiting mechanism, and it is difficult to control the lateral swing angle of the wrist arm, which further increases the risk of line disconnection and structure failure. UTILITY MODEL CONTENTS
[0005] The utility model aims at the problems existing in the prior art, and provides a prevent type railway overhead line system wrist arm structure, effectively prevents the hole wall crack propagation and the brittle fracture caused by fatigue accumulation, improves the service life and safety of the wrist arm structure, avoids the problem of separation from the contact line caused by too large lateral swing amplitude of the wrist arm, and guarantees the normal operation of the railway overhead line system.
[0006] To realize the above-mentioned purpose, the utility model adopts the technical scheme of:
[0007] The utility model provides a kind of anti-drop type railway overhead line structure of wrist arm structure, including flat wrist arm, inclined wrist arm and support arm connected between the flat wrist arm and the inclined wrist arm, the flat wrist arm and the inclined wrist arm are connected by base and H-shaped steel column respectively;The base includes bottom plate connected with H-shaped steel column, the bottom plate connects two vertical mounting lug plates, flat double lug is equipped between two mounting lug plates, the flat double lug is equipped with pin hole, and the lug hole of two mounting lug plates is connected by pin shaft and passes through the pin hole of flat double lug;The flat double lug is used to connect wrist arm;One end of the flat double lug close to the bottom plate is connected with fixed block, and the fixed block is connected with straight rod parallel to the pin shaft;Both sides mounting lug plate are equipped with arc slot, and both ends of the straight rod are respectively connected with the arc slot of both sides mounting lug plate.
[0008] Further, the fixed block is equipped with threaded hole, the straight rod is equipped with external thread, and the straight rod is connected with the fixed block by thread.
[0009] Further, the straight rod is connected with locking nut on both sides of the fixed block.
[0010] Further, the straight rod is connected with limit nut on one end of the straight rod that extends outside the arc slot.
[0011] Further, the central angle of the arc slot is 2-5 °.
[0012] Further, the end of the fixed block and the flat double lug is fixed by welding.
[0013] Compared with prior art, the utility model has the beneficial effects that:
[0014] 1, by the contact cooperation of straight rod and arc slot, load is transmitted in two ways, one way is transmitted by pin shaft, and the other way is transmitted by the contact surface of straight rod and arc slot, multiple path load distribution is formed, so that the load originally concentrated on the contact surface of pin shaft and lug hole is dispersed, the degree of local stress concentration of the part is reduced, hole wall crack propagation and brittle fracture caused by fatigue accumulation are effectively prevented, and the problem of wrist arm falling off is avoided.
[0015] 2, the arc slot guides and limits the sliding stroke of the straight rod, when the straight rod slides to the end point of the arc slot, the physical limiting action will prevent the flat double lug from further rotating, so as to limit the wrist arm side swing angle within the safety threshold, effectively avoid the problem of disengaging from contact line caused by too large wrist arm side swing amplitude, and ensure the normal operation of railway overhead line system. BRIEF DESCRIPTION OF DRAWINGS
[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description, obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.
[0017] Fig. 1 It is a whole structure schematic view of the wrist arm structure in an embodiment of the present application.
[0018] Fig. 2 It is a structure schematic view of the base in an embodiment of the present application.
[0019] Fig. 3 It is a structure schematic view of the base in an embodiment of the present application.
[0020] In the figure: 1, flat wrist arm; 2, inclined wrist arm; 3, support arm; 4, base; 5, H-shaped steel column; 6, bottom plate; 7, mounting ear plate; 8, flat double ear; 9, pin shaft; 10, fixed block; 11, straight rod; 12, arc-shaped slot; 13, locking nut; 14, limiting nut. DETAILED DESCRIPTION
[0021] The technical solutions of the present application will be described clearly and completely in the following with reference to the drawings in the present application, obviously, the described embodiments are only some embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.
[0022] In the description of the present application, it needs to be explained that the orientation or position relationship indicated by the terms "center", "upper", "lower", "vertical", "horizontal", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, or is the orientation or position relationship commonly placed when the product of the present application is used, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, structure and operation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only used for differentiation, and cannot be understood as indicating or implying relative importance.
[0023] In addition, the terms "horizontal", "vertical" and the like do not mean that the components must be absolutely horizontal or suspended, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.
[0024] In the description of the utility model, still need explaining, unless another explicit provision and limitation, term "arrange", "install", "link", "connect" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected, can be direct connection, also can be indirectly connected through intermediate medium, can be two elements inside the communication, for the ordinary skill in the art, the specific meaning of the above-mentioned term in the utility model can be understood according to specific circumstances.
[0025] In the railway overhead contact system, the cantilever structure as the key component of support and connection, its stability directly affects the reliability of the overhead contact system and the safety of train operation. However, the existing cantilever structure still has certain technical defects in actual operation, which needs to be optimized and improved.
[0026] The traditional cantilever structure usually adopts the hinge mode of pin shaft and ear plate to realize the rotating function, which has simple structure but obvious defects. Under the action of wind load and other lateral forces, the cantilever is easy to deviate laterally, resulting in serious local stress concentration at the edge of the ear hole of the mounting ear plate. Due to the long-term high-frequency micro-amplitude vibration of the railway overhead contact system, cracks are easy to be generated in the hole wall under the action of cyclic stress and gradually expand, finally leading to metal fatigue fracture, even causing the cantilever to fall off, which seriously threatens the safe operation of the overhead contact system. In addition, under the extreme environment of strong wind, if the lateral swing amplitude of the cantilever exceeds the design range, it may cause the cantilever to be separated from the contact line, resulting in power interruption, thereby affecting the normal operation of the train, and even causing safety accidents.
[0027] In the prior art, the load transmission of the cantilever structure mainly depends on the single contact surface of the pin shaft and the ear hole, which causes relatively concentrated stress, and easily aggravates the wear and fatigue damage of the contact part after long-term operation, thereby shortening the service life of the structure. At the same time, the traditional structure lacks effective limiting mechanism, and it is difficult to control the lateral swing angle of the cantilever, which further increases the risk of line disconnection and structural failure.
[0028] In view of the above technical problems, as shown in Figs. 1 to 3 The embodiment of the present application provides a cantilever structure for preventing railway overhead contact system from falling off, which comprises a horizontal cantilever 1, an inclined cantilever 2 and a support arm 3 connected between the horizontal cantilever 1 and the inclined cantilever 2, the horizontal cantilever 1 and the inclined cantilever 2 are connected through a base 4 and an H-shaped steel column 5 respectively; the base 4 comprises a bottom plate 6 connected with the H-shaped steel column 5, the bottom plate 6 is connected with two vertical mounting ear plates 7, a flat double ear 8 is arranged between the two mounting ear plates 7, the flat double ear 8 is provided with a pin hole, the ear hole of the two mounting ear plates 7 and the pin hole of the flat double ear 8 are connected through a pin 9; the flat double ear 8 is used for connecting the cantilever; one end of the flat double ear 8 close to the bottom plate 6 is connected with a fixing block 10, the fixing block 10 is connected with a straight rod 11 parallel to the pin 9; the two mounting ear plates 7 are both provided with an arc-shaped groove 12, and the two ends of the straight rod 11 are respectively connected with the arc-shaped grooves 12 of the two mounting ear plates.
[0029] When the lateral offset of the wrist arm connected with the flat double ears 8 is caused by wind load, the flat double ears 8 rotate horizontally around the pin shaft 9. At this time, the fixed block 10 fixedly connected with the flat double ears 8 rotates synchronously, driving the straight rod 11 to slide in the arc-shaped slot 12 of the ear plate 7 on both sides.
[0030] In the traditional structure, the contact surface of the pin shaft 9 and the ear hole is a single load transmission path, which is easy to cause local stress concentration. In the embodiment, the load is transmitted in two ways through the contact between the straight rod 11 and the arc-shaped slot 12: one way is through the pin shaft 9, and the other way is through the contact surface between the straight rod 11 and the arc-shaped slot 12. The load is distributed in multiple paths, thereby dispersing the load originally concentrated on the contact surface of the pin shaft 9 and the ear hole, reducing the local stress concentration degree of the part, effectively preventing the crack propagation of the hole wall and the brittle fracture caused by fatigue accumulation, and avoiding the problem of wrist arm falling off.
[0031] In addition, the arc-shaped slot 12 guides and limits the sliding stroke of the straight rod 11. When the straight rod 11 slides to the end point of the arc-shaped slot 12, the physical limiting action will prevent the flat double ears 8 from further rotating, thereby limiting the lateral swing angle of the wrist arm within a safety threshold, effectively avoiding the problem of disengagement from the contact line caused by excessive lateral swing of the wrist arm, and ensuring the normal operation of the railway overhead contact system.
[0032] In some embodiments, the fixed block 10 is provided with a threaded through hole, and the straight rod 11 is provided with an external thread. The straight rod 11 is connected with the fixed block 10 through the threaded connection.
[0033] When it is necessary to install or dismount the straight rod 11, the straight rod 11 is only needed to be passed through the arc-shaped slot 12 on one side, and then screwed into or out of the threaded through hole of the fixed block 10. When the straight rod 11 needs to be replaced after wear, the straight rod 11 can be quickly and conveniently operated, thereby reducing the maintenance difficulty and cost.
[0034] In some embodiments, the straight rod 11 is connected with a locking nut 13 on both sides of the fixed block 10. The locking nut 13 can
[0035] prevent the straight rod 11 from loosening or moving axially due to vibration, external force impact and other factors, thereby ensuring that the two ends of the straight rod 11 are always located in the corresponding arc-shaped slot 12.
[0036] In some embodiments, the straight rod 11 is connected with a limiting nut 14 at one end extending out of the arc-shaped slot 12.
[0037] When the straight rod 11 slides in the arc-shaped slot 12 of the mounting lug 7 on both sides, the limiting nut 14 will move together with the straight rod 11, and the limiting nut 14 will slide against the outer side end face of the mounting lug 7. By adding the limiting nut 14 at the outer end of the straight rod 11, the straight rod 11 is axially limited, and the flat double lug 8 is also limited, avoiding axial movement between the two mounting lugs 7 under the influence of wind load, and enhancing the stability.
[0038] In some embodiments, the central angle of the arc-shaped slot 12 is 2-5°.
[0039] Due to the central angle of the arc-shaped slot 12 being 2-5°, the small angle range limits the sliding stroke of the straight rod 11, thereby limiting the rotation angle of the flat double lug 8, i.e. limiting the side swing angle of the wrist arm, thereby effectively avoiding the problems of disengagement from the contact wire, damage to the wrist arm structure and the like caused by the too large side swing angle, and ensuring the stable operation of the overhead contact system.
[0040] In some embodiments, the fixed block 10 and the end of the flat double lug 8 are fixed by welding.
[0041] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.
Claims
1. A structure of a cantilever arm for a catenary of a railway, which prevents disengagement, characterized in that, The utility model provides a kind of support arm (3) being connected between the flat arm (1) and the inclined arm (2), the flat arm (1) and the inclined arm (2) are connected respectively by base (4) and H-shaped steel column (5); The base (4) includes a bottom plate (6) connected to the H-shaped steel column (5), the bottom plate (6) is connected to two vertical mounting ear plates (7), a flat double ear (8) is provided between the two mounting ear plates (7), the flat double ear (8) is provided with a pin hole, the pin hole of the two mounting ear plates (7) and the pin hole of the flat double ear (8) are connected by a pin (9); the flat double ear (8) is used for connecting the arm; Characterized in that one end of the flat double ear (8) close to the bottom plate (6) is connected to a fixed block (10), the fixed block (10) is connected to a straight rod (11) parallel to the pin (9); both sides of the mounting ear plate (7) are provided with an arc slot (12), both ends of the straight rod (11) are respectively connected to the arc slots (12) of both sides of the mounting ear plate.
2. The anti-drop type of cantilever structure for overhead contact system of railway as claimed in claim 1 wherein, The fixed block (10) is provided with a threaded hole, the straight rod (11) is provided with an external thread, and the straight rod (11) and the fixed block (10) are connected by threads.
3. The anti-drop type railway overhead line system arm structure according to claim 2, characterized in that, Both sides of the straight rod (11) located at the two sides of the fixed block (10) are connected to a locking nut (13).
4. The anti-drop type of cantilever structure for overhead contact system of railway as claimed in claim 3 wherein, One end of the straight rod (11) extending out of the arc slot (12) is connected to a limit nut (14).
5. The anti-drop type of cantilever structure for overhead contact system of railway as claimed in claim 1 wherein, The central angle of the arc slot (12) is 2-5°.
6. The anti-drop type of armpit structure for railway contact network according to claim 1, characterized in that, The end of the fixed block (10) and the flat double ear (8) is fixed by welding.