Medium-low speed maglev turnout F rail joint pressing device

Abstract

The utility model relates to an F rail joint pressing device for a medium-low speed magnetic levitation turnout, which can prevent a middle lap joint F rail from moving up and down, does not increase the lap joint pressure of the F rails, is favorable for reducing the abrasion of the mutual lap joint of the F rails to the minimum when a short lap joint F rail and an adjacent F rail rotate relatively, and prolongs the service life of the F rails. Comprising a front beam F rail, a middle lap joint F rail and a rear beam F rail, a base plate is arranged on a boss of a connector of the front beam F rail and the rear beam F rail, a pressing plate is located on the base plate, and gaps of 0.5-1 mm are formed between the pressing plate and the two side limbs of a groove of the middle lap joint F rail. The device has the advantages that firstly, the problem of larger friction force generated at the lap joint part by the pressure of the F rail interface pressing plate bolt of the magnetic levitation turnout is solved, and the driving energy loss is reduced; the problems that large friction force is generated at the lap joint position under the pressure of the F rail connector pressing plate bolt of the magnetic levitation turnout, the lap joint position is abraded fast, and the height difference of the magnetic pole face of the F rail connector is caused are solved; and thirdly, the method for solving the problem is simple, the cost is low, and the generated effect is good.

Description

Technical Field

[0001] This utility model relates to a medium- and low-speed maglev turnout F-rail joint clamping device that can prevent the intermediate overlapping F-rail from moving up and down without increasing the overlapping pressure of the F-rail, and also minimize the wear at the overlapping point of the F-rail when the short overlapping F-rail rotates relative to the adjacent F-rail, thus extending the service life of the F-rail. Background Technology

[0002] CN207079428U, entitled "Magnetic Levitation Turnout Beam Transition Connection Device and Magnetic Levitation Turnout System," describes a magnetic levitation turnout beam transition connection device comprising: a transition beam connecting a first beam and a second beam, and a hinged connection mechanism connecting the two sides of the first beam and the two sides of the second beam. The transition beam is fixedly hinged to the middle of the first beam, and the transition beam is linearly movable hinged to the middle of the second beam. This device has a simpler structure, is easier to install and maintain, and is safer and more reliable, improving the stability of trains when passing. However, its drawback is that, after more than five years of use, the magnetic pole surface of the short F-rail overlapped by this device is lower than that of the adjacent F-rail, creating a height difference (S). Figure 7 As shown ( Figure 7 The markings (1. Front beam F-rail, 2. Intermediate overlapping F-rail, 3. F-rail pressure plate, 4. Pressure plate screw, 5. Rear beam F-rail) affect the stability of train operation. In severe cases, vehicles passing through this area will experience vibration, requiring the replacement of many intermediate overlapping F-rails in turnouts. Analysis of the causes: 1. The patented F-rail overlap area includes the front beam F-rail, intermediate overlapping F-rail, and rear beam F-rail. While there are protrusions on the joints of the front and rear beam F-rails, no padding is provided. The pressure plate directly presses against the protrusions of the front and rear beam F-rails. The protrusions of the front and rear beam F-rails are at the same height as the two sides of the groove of the intermediate overlapping F-rail, with no gap between the pressure plate and the two sides of the groove. 2. Due to the lack of gap, the pressure of the pressure plate bolt is transmitted to the side of the overlapping F-rail, causing the overlapping part of the F-rail to bear significant pressure. When the F-rail rotates with the turnout beam, the overlapping part will generate a frictional force of 18000N due to the pressure, which is 360 times the frictional force of this patented technology. This accelerates wear at the overlapping joints, leading to a misalignment of 5mm (approximately 1-2 mm) between the magnetic pole surfaces of the intermediate overlapping F-rail and the front and rear beam F-rails. Figure 2 As shown in Figure S, the track F rail becomes uneven, affecting the stability of train operation. In severe cases, the vehicle will vibrate when passing through this point. Summary of the Invention

[0003] Design objective: To overcome the shortcomings of the prior art, this design aims to create a medium- and low-speed maglev turnout F-rail joint clamping device that can prevent the intermediate overlapping F-rail from moving up and down without increasing the overlapping pressure of the F-rail, and also minimize the wear at the overlapping point of the F-rails during the relative rotational movement of the short overlapping F-rails and adjacent F-rails, thereby extending the service life of the F-rails.

[0004] Design scheme: The maglev car suspension control system has special precision requirements for the track: the misalignment between the magnetic pole surfaces of the F rail is less than 1mm. When the misalignment is greater than 2mm, a slight vibration will be generated during the operation.

[0005] Analysis of the reasons for the decrease in the magnetic pole face of the middle short F-rail: The side limbs of the middle short F-rail and the two side F-rails of the turnout overlap and are pressed together by the pressure plate. During the turning process, there is significant friction, causing wear on the side limbs of the F-rails. As a result, the magnetic pole face of the middle short F-rail gradually decreases. Specifically, as follows... Figure 4 As shown: the front and rear beam F-rail joints consist of a boss and two side limbs, while the middle overlapping F-rail joint is formed by the grooves created by the two side limbs. When the bosses of the two side F-rails are inserted into the groove of the middle short F-rail, the bosses and the tops of the two side limbs of the short F-rail form a plane, and the bottoms of the two side limbs of the short F-rail overlap the side limbs of the front and rear beam F-rails. At this time, the pressure plate is directly installed on the boss, which also presses the two side limbs of the short F-rail tightly, increasing the pressure at the overlap.

[0006] To address this issue, this invention employs a structural design that reduces pressure on the two sides of the short F-rail, thereby decreasing friction at the F-rail overlap and reducing wear. Specifically, as follows... Figure 5 As shown: Place a 0.5 or 1 mm thick pad 4 on the boss of the front and rear beam F rail joint to raise the boss. Figure 6 As shown, the pressure plate is then placed on the pad, with a gap of 0.5 to 1 mm between the pressure plate and the two sides of the short F-rail groove. The pressure plate exerts no pressure on the two sides of the short F-rail. The friction between the front and rear beam F-rails and the short overlapping F-rails during their mutual movement comes only from the self-weight of the short overlapping F-rails, which generates a frictional force of 50 N. When the four bolts of the pressure plate are tightened, they generate a frictional force of 18,000 N, increasing the life of the F-rail by 360 times.

[0007] Technical solution: A medium-low speed maglev turnout F-rail joint clamping device includes a front beam F-rail, an intermediate overlapping F-rail, and a rear beam F-rail. A pad is placed on the protrusion of the front beam F-rail and the rear beam F-rail joint, and a pressure plate is located on the pad. There is a gap of 0.5 to 1 mm between the pressure plate and the two sides of the groove of the intermediate overlapping F-rail.

[0008] Compared with the prior art, this utility model has the following advantages: First, it solves the problem of the large frictional force generated by the bolt pressure of the F-rail interface pressure plate of the maglev turnout at the overlapping part, thus reducing the loss of driving energy; second, it solves the problem of the large frictional force generated by the bolt pressure of the F-rail interface pressure plate of the maglev turnout at the overlapping part, which causes rapid wear at the overlapping part and produces a height difference of the magnetic pole surface of the F-rail joint, affecting the comfort and safety of the train; third, the solution is simple, low-cost, and produces good results. Attached Figure Description

[0009] Figure 1 This is a front view schematic diagram of the boss where the shim is placed in the clamping device for the F-rail joint of the medium-low speed maglev turnout;

[0010] Figure 2 yes Figure 1 Top view diagram;

[0011] Figure 3 This is a front view schematic diagram of the pressure plate placed on the shim in the clamping device of the F-rail joint of the medium-low speed maglev turnout;

[0012] Figure 4 yes Figure 3 Top view diagram;

[0013] Figure 5 This is a schematic diagram of the space within which the F-rail joint of the turnout can rotate relative to each other within a certain range.

[0014] Figure 6 This is a diagram showing the pad plate attached to the bosses at the F-rail interfaces of the front and rear beams, with the bosses raised and the pressure plate placed on the pad plate.

[0015] Figure 7 This is a schematic diagram of the background technology. Detailed Implementation

[0016] Example 1: Refer to Appendix Figure 1-6 A clamping device for F-rail joints of medium- and low-speed maglev turnouts includes a front beam F-rail 1, an intermediate overlapping F-rail 2, and a rear beam F-rail 3. A pad 4 is placed on the protrusion of the joint between the front beam F-rail 1 and the rear beam F-rail 3. A pressure plate 5 is located on the pad 4, with a gap of 0.5–1 mm between the pressure plate and the two sides of the groove of the intermediate overlapping F-rail. The pad 4 has a thickness of 0.5 or 1 mm. The pressure plate 5 is clamped onto the rear beam F-rail 3 using multiple bolts.

[0017] Its working principle: 1. The F-rail joint of the turnout is designed with a certain range of mutual rotation space: such as Figure 5 As shown, the bosses at the F-rail interfaces of the front and rear beams have an inward slope of α, while the grooves at the short lap F-rail interfaces have an outward slope of α, forming a rotation space for the F-rails. 2. As Figure 6As shown, the pad is attached to the boss of the F-rail interface on the front and rear beams, raising the boss. The pressure plate is placed on the pad, creating a 0.5-1mm gap between the pressure plate and the side limb of the short F-rail interface. The pressure plate does not exert pressure on the side limb of the short F-rail, limiting the vertical movement of the short F-rail to within 0.5-1mm. 3. Because the pressure plate does not press on the grooved side limb of the short overlapping F-rail, the overlapping F-rail only experiences a 50N frictional force due to its own weight when moving, which is much smaller than the 18000N frictional force generated by tightening four bolts. The wear of the overlapping F-rail will be very small, and the service life of the short F-rail is 360 times that of the F-rail without the pad. Therefore, the height difference of the magnetic pole surface caused by wear due to repeated turns is greatly reduced.

[0018] It should be understood that although the above embodiments provide a relatively detailed textual description of the design concept of this utility model, these textual descriptions are merely simple textual descriptions of the design concept of this utility model, and not limitations on the design concept of this utility model. Any combination, addition, or modification that does not exceed the design concept of this utility model shall fall within the protection scope of this utility model.

Claims

1. A clamping device for F-rail joints of medium- and low-speed maglev turnouts, comprising a front beam F-rail (1), an intermediate overlapping F-rail (2), and a rear beam F-rail (3), characterized in that: A pad (4) is placed on the boss of the front beam F rail (1) and the rear beam F rail (3) joint. The pressure plate (5) is located on the pad (4). There is a gap of 0.5 to 1 mm between the pressure plate and the two sides of the intermediate overlapping F rail groove.

2. The low-speed maglev turnout F-rail joint clamping device according to claim 1, characterized in that: The thickness of the pad (4) is 0.5 or 1 mm.

3. The low-speed maglev turnout F-rail joint clamping device according to claim 1, characterized in that: The pressure plate (5) uses multiple bolts to press the pad (4) onto the rear beam F rail (3).

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