A shear yoke for a beam end lifting device having a shape memory alloy leaf spring

Abstract

The present application belongs to the field of rail transit technology, and discloses a shear fork with a shape memory alloy sheet spring for a beam end lifting sleeper device, which comprises a shear fork body, both ends of the shear fork body are hingedly connected to fixed sleepers on both sides of a expansion joint, and the middle part of the shear fork body is hingedly connected to a movable sleeper located at the expansion joint; the shape memory alloy sheet spring is matched with the shape of the shear fork body and is attached to the shear fork body, so that the shear fork body is automatically reset when deformed, and then the movable sleeper is reset by the reset shear fork body. By directly applying the shape memory alloy sheet spring to the shear fork in the prior art, when the shear fork body is deformed, the shape memory alloy sheet spring can drive the shear fork body to automatically reset, and then the movable sleeper which is displaced and deformed is reset by the reset shear fork body, without the need for manual resetting by an inspector.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rail transit, in particular to a scissors fork with a shape memory alloy sheet spring for a beam end lifting sleeper device. BACKGROUND

[0002] The beam end expansion device is an important component of a bridge. In order to enable vehicles to pass through the bridge smoothly and safely and meet the need of structural deformation, various devices are arranged at the bridge deck expansion joint 100. The expansion device effectively ensures the continuity and smoothness of the track. When the beam joint is large, a cross short rail, i.e., a movable track sleeper 200, needs to be arranged at the beam joint. The cross short rail needs to be connected with the fixed track sleepers 300 at both ends of the beam joint to form a whole, and the connecting device generally adopts a scissors fork structure (scissors fork body 1), such as the scissors fork disclosed in the prior art with the publication number CN208250913U and the name of beam end lifting sleeper device.

[0003] However, the scissors fork and the track sleeper are connected by bolts. When the movable track sleeper 200 is skewed due to uneven longitudinal expansion stress, or the scissors fork is skewed out of the plane, manual resetting by an inspection personnel is often required, which is time-consuming and laborious.

[0004] Therefore, how to provide a scissors fork with a shape memory alloy sheet spring for a beam end lifting sleeper device capable of realizing self-resetting is a problem that those skilled in the art need to solve urgently. SUMMARY

[0005] Therefore, the present application provides a scissors fork with a shape memory alloy sheet spring for a beam end lifting sleeper device capable of realizing self-resetting.

[0006] In order to achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0007] A scissors fork with a shape memory alloy sheet spring for a beam end lifting sleeper device, comprising:

[0008] A scissors fork body, both ends of the scissors fork body are hingedly connected to the fixed track sleepers on both sides of the expansion joint, and the middle part of the scissors fork body is hingedly connected to the movable track sleeper located at the expansion joint;

[0009] A shape memory alloy sheet spring, the shape memory alloy sheet spring is adapted to the shape of the scissors fork body and is attached to the scissors fork body, so that the scissors fork body is automatically reset when deformed, and the movable track sleeper is reset by the reset scissors fork body.

[0010] Compared with the prior art, the technical scheme has the advantages that the shape memory alloy sheet spring is directly applied to the scissors fork in the prior art, and when the scissors fork body is deformed, the shape memory alloy sheet spring can drive the scissors fork body to automatically reset, and then the reset scissors fork body drives the displaced and deformed movable sleeper to reset, without manual resetting by an inspection personnel.

[0011] Further, the shape memory alloy sheet spring comprises:

[0012] A middle fulcrum ring body is sleeved on the middle bolt of the scissors fork body, the upper surface of the middle fulcrum ring body has two first upper pieces arranged in opposite directions, and the lower surface of the middle fulcrum ring body has two first lower pieces arranged in opposite directions;

[0013] End fulcrum ring bodies are two, which are respectively sleeved on the end bolts at the two ends of the scissors fork body, the upper surface of the end fulcrum ring body has a second upper piece, and the lower surface of the end fulcrum ring body has a second lower piece;

[0014] Side fulcrum ring bodies are four, which are respectively sleeved on the four side bolts of the side of the scissors fork body, the upper surface of the side fulcrum ring body has a third upper piece, and the lower surface of the side fulcrum ring body has a third lower piece;

[0015] The two first upper pieces are respectively connected with the two corresponding third upper pieces and are attached to the lower surface of the upper layer long arm of the scissors fork body;

[0016] The second upper piece is connected with the corresponding third upper piece and is attached to the lower surface of the upper layer short arm of the scissors fork body;

[0017] The two first lower pieces are respectively connected with the two corresponding third lower pieces and are attached to the upper surface of the lower layer long arm of the scissors fork body;

[0018] The second lower piece is connected with the corresponding third lower piece and is attached to the upper surface of the lower layer short arm of the scissors fork body.

[0019] The beneficial effects of the above technical scheme are that the shape memory alloy sheet spring is divided into multiple single components, so that only the damaged components need to be replaced during later maintenance and replacement, without the need to replace the entire component, greatly reducing the cost.

[0020] Further, the first upper piece, the second upper piece, the third upper piece, the first lower piece, the second lower piece and the third lower piece all have shape memory characteristics.

[0021] Further, the upper surface or the lower surface of the first upper sheet, the second upper sheet, the third upper sheet, the first lower sheet, the second lower sheet and the third lower sheet is sequentially attached with a resistance wire heating layer and an insulation layer.

[0022] The shape memory alloy sheet spring is automatically reset by energizing and heating the resistance wire, thereby driving the shear fork body to reset. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the provided drawings.

[0024] Figure 1 A structure schematic diagram of the shear fork with the shape memory alloy sheet spring for the beam end lifting device in use is provided.

[0025] Figure 2 A first perspective schematic diagram of the shear fork with the shape memory alloy sheet spring for the beam end lifting device is provided.

[0026] Figure 3 A second perspective schematic diagram of the shear fork with the shape memory alloy sheet spring for the beam end lifting device is provided.

[0027] Figure 4 A third perspective schematic diagram of the shear fork with the shape memory alloy sheet spring for the beam end lifting device is provided.

[0028] Figure 5 A structure schematic diagram of the shape memory alloy sheet spring is provided.

[0029] Figure 6 A first case schematic diagram of displacement deformation of the movable sleeper is provided.

[0030] Figure 7 A second case schematic diagram of displacement deformation of the movable sleeper is provided.

[0031] Figure 8 A third case schematic diagram of displacement deformation of the movable sleeper is provided. DETAILED DESCRIPTION

[0032] Embodiments of the present application are described below in detail with reference to the accompanying drawings, wherein the same or similar numerals represent the same or similar elements or elements having the same or similar functions throughout the accompanying drawings. The embodiments described below by reference to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation on the present application.

[0033] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0034] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0035] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0036] The embodiment of the present application discloses a scissors fork with a shape memory alloy sheet spring for a beam end lifting device, comprising:

[0037] The scissors fork body 1 (its structure is prior art, please refer to CN208250913U-Scissors fork for beam end lifting device, which will not be described in detail here), both ends of the scissors fork body 1 are hingedly connected to the fixed rail sleeper 300 on both sides of the expansion joint 100, and the middle part of the scissors fork body 1 is hingedly connected to the movable rail sleeper 200 located at the expansion joint 100;

[0038] The shape memory alloy sheet spring 2 is adapted to the shape of the scissors fork body 1 and attached to the scissors fork body 1, so that the scissors fork body 1 is automatically reset when deformed, and then the movable rail sleeper 200 is driven to reset by the reset scissors fork body 1.

[0039] Specifically, the shape memory alloy sheet spring 2 comprises:

[0040] a middle fulcrum ring body 21, which is sleeved on the middle bolt 11 of the scissor body 1, and has two first upper sheets 211 oppositely arranged on the upper surface of the middle fulcrum ring body 21 and two first lower sheets 212 oppositely arranged on the lower surface of the middle fulcrum ring body 21;

[0041] two end fulcrum ring bodies 22, each of which is sleeved on an end bolt 12 at the two ends of the scissor body 1, and has a second upper sheet 221 on the upper surface of the end fulcrum ring body 22 and a second lower sheet 222 on the lower surface of the end fulcrum ring body 22;

[0042] four side fulcrum ring bodies 23, each of which is sleeved on a side bolt 13 at the side of the scissor body 1, and has a third upper sheet 231 on the upper surface of the side fulcrum ring body 23 and a third lower sheet 232 on the lower surface of the side fulcrum ring body 23;

[0043] the two first upper sheets 211 are respectively butted against the two corresponding third upper sheets 231 and attached to the lower surface of the upper long arm 14 of the scissor body 1;

[0044] the second upper sheet 221 is butted against the corresponding third upper sheet 231 and attached to the lower surface of the upper short arm 15 of the scissor body 1;

[0045] the two first lower sheets 212 are respectively butted against the two corresponding third lower sheets 232 and attached to the upper surface of the lower long arm 16 of the scissor body 1;

[0046] the second lower sheet 222 is butted against the corresponding third lower sheet 232 and attached to the upper surface of the lower short arm 17 of the scissor body 1.

[0047] The first upper sheet 211, the second upper sheet 221, the third upper sheet 231, the first lower sheet 212, the second lower sheet 222 and the third lower sheet 232 all have shape memory characteristics.

[0048] The upper surface or the lower surface of the first upper sheet 211, the second upper sheet 221, the third upper sheet 231, the first lower sheet 212, the second lower sheet 222 and the third lower sheet 232 is sequentially attached with a resistance wire heating layer and an insulating layer.

[0049] Figure 6 As shown, the first case of displacement deformation of the movable sleeper 200: the movable sleeper 200 is displaced and deformed from the straight state (see Figure 6 The black marked movable sleeper is displaced and deformed, i.e. Figure 6The gray marked movable rail sleeper is deformed with one end tilting inwards and the other end tilting outwards;

[0050] Figure 7 As shown, the second case of displacement deformation of the movable rail sleeper 200: the movable rail sleeper 200 is deformed from the straight state (see Figure 7 The black marked movable rail sleeper is deformed, that is, the movable rail sleeper is deformed from the straight state (see Figure 7 The gray marked movable rail sleeper is deformed with one end tilting inwards and the other end tilting outwards;

[0051] Figure 8 As shown, the third case of displacement deformation of the movable rail sleeper 200: the movable rail sleeper 200 is deformed from the straight state (see Figure 8 The black marked movable rail sleeper is deformed, that is, the movable rail sleeper is deformed from the straight state (see Figure 8 The gray marked movable rail sleeper is deformed with one end tilting inwards and the other end tilting outwards.

[0052] When the movable rail sleeper is deformed, the shear fork body on both sides is deformed, at this time, the shape memory alloy sheet spring frame is deformed at the same time, then the shape memory alloy sheet spring frame is heated by electricity to make it automatically reset, and then the shear fork body 1 is automatically reset, and then the movable rail sleeper 200 is reset by the reset shear fork body 1.

[0053] The shape memory alloy sheet spring frame is arranged on the shear fork body, which can not only keep the uniformity of the movable rail stretching and avoid the phenomenon of being stuck, but also can automatically reset the shape memory alloy sheet spring frame by heating by electricity when the movable rail is skewed due to uneven longitudinal stretching stress or the shear fork is skewed out of the plane, without manual resetting, thereby greatly saving the railway maintenance time and improving the railway maintenance efficiency.

[0054] The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts of each embodiment can be referred to each other. For the device disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple, and the related parts can be referred to the method part.

[0055] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to the embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A scissor fork for a beam-end lifting headgear with shape memory alloy leaf springs, characterized in that, include: The scissor fork body (1) has its two ends hinged to the fixed sleepers (300) on both sides of the expansion joint (100), and its middle part hinged to the movable sleeper (200) located in the expansion joint (100). A shape memory alloy leaf spring (2) is adapted to the shape of the scissor fork body (1) and attached to the scissor fork body (1) so that the scissor fork body (1) automatically resets when deformed, and then the reset scissor fork body (1) drives the movable sleeper (200) to reset. The shape memory alloy leaf spring (2) includes: The central pivot ring (21) is sleeved on the central bolt (11) of the scissor fork body (1). The upper surface of the central pivot ring (21) has two first upper pieces (211) arranged in opposite directions, and the lower surface of the central pivot ring (21) has two first lower pieces (212) arranged in opposite directions. The end fulcrum ring (22) consists of two parts, which are respectively fitted onto the end bolts (12) at both ends of the scissor fork body (1). The upper surface of the end fulcrum ring (22) has a second upper piece (221), and the lower surface of the end fulcrum ring (22) has a second lower piece (222). Side pivot ring (23), there are four side pivot rings (23), which are respectively fitted on the four side bolts (13) on the side of the scissor fork body (1). The upper surface of the side pivot ring (23) has a third upper piece (231), and the lower surface of the side pivot ring (23) has a third lower piece (232). The two first upper plates (211) are respectively connected to the two corresponding third upper plates (231) and attached to the lower surface of the upper long arm (14) of the scissor fork body (1); The second upper piece (221) is connected to the corresponding third upper piece (231) and attached to the lower surface of the upper short arm (15) of the scissor fork body (1); The two first lower pieces (212) correspond to the two third lower pieces (232) respectively, and are attached to the upper surface of the lower long arm (16) of the scissor fork body (1); The second lower piece (222) docks with its corresponding third lower piece (232) and is attached to the upper surface of the lower short arm (17) of the scissor fork body (1); The first upper piece (211), the second upper piece (221), the third upper piece (231), the first lower piece (212), the second lower piece (222), and the third lower piece (232) all possess shape memory characteristics; The upper or lower surfaces of the first upper sheet (211), the second upper sheet (221), the third upper sheet (231), the first lower sheet (212), the second lower sheet (222), and the third lower sheet (232) are each sequentially covered with a resistance wire heating layer and an insulating layer.

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