Device for testing low-temperature static stiffness of under-rail backing plate

Abstract

The utility model relates to the technical field of detection equipment, in particular to a low-temperature static stiffness test device for a base plate under a rail. A low-temperature static rigidity testing device for a base plate under a rail comprises a control computer, a supporting frame is arranged behind the control computer, a low-temperature freezing box is placed at the upper end of the supporting frame, a self-pressurization type low-temperature container is arranged on one side of the low-temperature freezing box, and the self-pressurization type low-temperature container is connected with the low-temperature freezing box through a connecting pipe. And a press detection assembly is arranged on the right side of the control computer. According to the low-temperature static stiffness test device, the self-pressurization type low-temperature container and the low-temperature freezing box are arranged, liquid nitrogen stored in the self-pressurization type low-temperature container can be introduced into the low-temperature freezing box through a pipeline to freeze the elastic backing plate to the required temperature, and then the liquid nitrogen is rapidly transferred to the pressure detection assembly to perform a low-temperature static stiffness test on the elastic backing plate.

Description

Technical Field

[0001] The utility model relates to the technical field of detection equipment, in particular to a low-temperature static stiffness test device for the under-rail pad. Background Technique

[0002] The railway elastic pad is used between the rail and the concrete sleeper. Its main function is to buffer the high-speed oscillation and impact generated when the vehicle passes through the rail, and to maintain the roadbed and sleeper. Since it is exposed to the atmosphere for a long time, it is required to have good resistance to natural aging, cold resistance and heat resistance. Among them, the low-temperature static stiffness detection is an important detection method for measuring the performance of the elastic pad. The main reason for the low-temperature static stiffness detection of the railway elastic pad is to ensure its performance and safety under extreme low-temperature conditions. Under low-temperature conditions, the physical and mechanical properties of the material may change, including increased hardness and enhanced brittleness, etc., which may affect the static stiffness of the pad, that is, the ability of the pad to resist deformation. If the static stiffness of the pad changes significantly at low temperature, it may affect the stability and safety of the railway system, thus affecting the normal operation of the train and the safety of passengers. Therefore, it is very necessary to carry out low-temperature static stiffness detection on the railway elastic pad.

[0003] Through retrieval, the dynamic and static stiffness testing machine for railway track pads with the publication number: CN216082357U discloses a dynamic and static stiffness testing machine for railway track pads. The technical key points are: including a workbench, a U-shaped frame is fixedly installed on the surface of the workbench, a sliding groove is opened on the surface of the workbench, a placing plate is slidably installed in the sliding groove, two groups of oppositely placed L-shaped fixing plates are fixedly installed on the surface of the placing plate, a pad body is placed on the surface of the placing plate, two opposite inner walls of the U-shaped frame are fixedly connected with an installation plate, multiple test columns matched with the body are slidably installed on the installation plate, a limiting mechanism matched with the placing plate is installed on the workbench, a fixing mechanism matched with the body is installed on the surface of the fixing plate, and a control mechanism matched with the test column is installed on the U-shaped frame. The control mechanism includes a transmission part and an impact part.

[0004] However, the above-mentioned dynamic and static stiffness testing machine for railway track pads does not have a corresponding refrigeration device and cannot measure the static stiffness of the elastic pad at low temperature. Content of the Utility Model

[0005] In view of the existing problems, the utility model provides a low-temperature static stiffness test device for the under-rail pad to solve the problem that the dynamic and static stiffness testing machine for railway track pads in the background technique does not have a corresponding refrigeration device and cannot measure the static stiffness of the elastic pad at low temperature.

[0006] To solve the existing problems, the utility model provides a low-temperature static stiffness test device for an under-rail pad, which includes a control computer. A support frame is arranged behind the control computer. A low-temperature freezer is placed on the upper end of the support frame. A self-pressurizing low-temperature container is arranged on one side of the low-temperature freezer. The self-pressurizing low-temperature container is connected to the low-temperature freezer through a connecting pipe. A press detection component is arranged on the right side of the control computer. The pressure detection component includes a press. A support steel plate is arranged at the lower part inside the press. Two layers of sandpaper are placed on the upper surface of the support steel plate. A load distribution plate is placed on the upper side of the uppermost layer of sandpaper. A bearing steel plate is arranged on the upper side of the load distribution plate. A bearing head is connected to the middle of the upper surface of the bearing steel plate. An upper loading head is arranged directly above the bearing head. The upper loading head is connected to the upper part inside the press. Three displacement sensors are arranged on the upper surface of the support steel plate.

[0007] Further, the size of the sandpaper is smaller than that of the support steel plate.

[0008] Further, the displacement sensor includes a base placed on the upper surface of the support steel plate, and a probe is connected above the base through an adapter rod.

[0009] Further, the control computer is electrically connected to the pressure detection component and the sensors.

[0010] Further, an elastic pad can be placed between the two layers of sandpaper.

[0011] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0012] 1. By setting the self-pressurizing low-temperature container and the low-temperature freezer, the liquid nitrogen stored in the self-pressurizing low-temperature container can be introduced into the low-temperature freezer through the connecting pipe to freeze the elastic pad to the required temperature, and then quickly transferred to the pressure detection component to conduct a low-temperature static stiffness test on the elastic pad. Description of the Drawings

[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0014] Figure 2 It is a schematic diagram of the structure of the pressure detection component of the utility model;

[0015] Figure 3 It is for the utility model Figure 2 Enlarged view at A;

[0016] Figure 4 It is for the Figure 1 Enlarged view at B of the utility model;

[0017] In the figure: 1. Control computer; 2. Support frame; 3. Low-temperature freezer; 4. Self-pressurizing low-temperature container; 5. Connecting pipe; 6. Pressure detection assembly; 601. Press; 602. Support steel plate; 603. Abrasive cloth; 604. Load distribution plate; 605. Bearing steel plate; 606. Bearing head; 607. Loading head; 608. Displacement sensor; 6081. Base; 6082. Connecting rod; 6083. Probe; 7. Elastic cushion plate. Specific embodiments

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0019] Please refer to Figures 1-4 , a low-temperature static stiffness test device for an under-rail cushion plate, including a control computer 1. A support frame 2 is arranged behind the control computer 1. A low-temperature freezer 3 is placed on the upper end of the support frame 2. A self-pressurizing low-temperature container 4 is arranged on one side of the low-temperature freezer 3. The self-pressurizing low-temperature container 4 is connected to the low-temperature freezer 3 through a connecting pipe 5. A pressure detection assembly 6 is arranged on the right side of the control computer 1; the pressure detection assembly 6 includes a press 601. A support steel plate 602 is arranged at the lower part inside the press 601. Two layers of abrasive cloth 603 are placed on the upper surface of the support steel plate 602. A load distribution plate 604 is placed on the upper side of the uppermost layer of abrasive cloth 603. A bearing steel plate 605 is arranged on the upper side of the load distribution plate 604. A bearing head 606 is connected to the middle of the upper surface of the bearing steel plate 605. A loading head 607 is arranged directly above the bearing head 606. The loading head 607 is connected to the upper part inside the press 601. Three displacement sensors 608 are arranged on the upper surface of the support steel plate 602.

[0020] Among them, the size of the abrasive cloth 603 is smaller than the size of the support steel plate 602.

[0021] Among them, the displacement sensor 608 includes a base 6081 placed on the upper surface of the support steel plate 602. A probe 6083 is connected above the base 6081 through a connecting rod 6082.

[0022] Among them, the control computer 1 is electrically connected to the pressure detection assembly 6 and the displacement sensor 608.

[0023] Among them, an elastic cushion plate 7 can be placed between the two layers of abrasive cloth 603.

[0024] Working principle: Before starting the test, the elastic cushion to be measured and all components and equipment for the test shall be left standing in an environment of 23°C ± 3°C for at least 24 hours.

[0025] After standing, the test device shall be placed on the press in the order from bottom to top as follows: support steel plate 602, a layer of abrasive cloth 603 with a particle size of P120 and the abrasive grain side facing up, elastic cushion plate 7, another layer of abrasive cloth 603 with a particle size of P120 and the abrasive grain side facing down, load distribution plate 604, bearing steel plate 605 and the bearing head 606 connected thereto. At least 3 independent displacement sensors 608 shall be arranged on the upper surface of the support steel plate 602, and the probes 6083 of the displacement sensors 608 shall measure the vertical displacement of the bearing steel plate 605 at equal intervals.

[0026] Then, the elastic cushion plate 7 to be measured shall be placed into the low-temperature freezer 3, nitrogen shall be supplied to the low-temperature freezer 3 through the connecting pipe 5 by the self-pressurizing low-temperature container 4, and at the same time, when the temperature in the low-temperature freezer 3 is controlled by the control computer 1 to drop to -35°C, timing shall start, and the formal test shall be carried out after 16 hours.

[0027] Before the test, the displacement sensor shall be set to zero, and then the loading head 607 shall be loaded at a speed of 60 kN / min ± 10 kN / min to the maximum load of 80 kN. The displacements D1 and D2 of the bearing steel plate 605 (both are the averages of 3 displacement sensors) when the load is applied to F1 = 20 kN and F2 = 70 kN shall be recorded respectively. The static stiffness value (K SAT ) shall be calculated according to the following formula.

[0028]

[0029] It should be noted that:

[0030] (1) When the required maximum load value of the replaced cushion plate is 100 kN, F1 and F2 are 20 kN and 80 kN respectively.

[0031] (2) When the required maximum load value of the replaced cushion plate is 160 kN, F1 and F2 are 100 kN and 150 kN respectively.

[0032] (3) When the displacement difference between F2 and F1 measured by any one of the displacement sensors 608 differs from the value of (D2 - D1) measured by the 3 displacement sensors 608 by more than 20%, the test shall be repeated, and the load shall be applied to the center of the elastic cushion plate 7. Repeat the above test twice, and stay for 1 minute after each unloading and then continue to load. The value of the third test shall be used as the static stiffness of the elastic cushion plate.

[0033] The above are only the preferred embodiments of the present utility model, and do not impose any form of limitation on the present utility model; any ordinary technician in the industry can smoothly implement the present utility model according to the illustrations in the specification and the above description; however, any minor changes, modifications and equivalent variations made by those skilled in the art within the scope of the technical solution of the present utility model by using the technical content disclosed above are all equivalent embodiments of the present utility model; at the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present utility model still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A low-temperature static stiffness test device for an under-rail pad, comprising a control computer (1), characterized in that: A support frame (2) is provided at the rear of the control computer (1). A low-temperature freezer (3) is placed on the upper end of the support frame (2). A self-pressurizing low-temperature container (4) is provided on one side of the low-temperature freezer (3). The self-pressurizing low-temperature container (4) is connected to the low-temperature freezer (3) through a connecting pipe (5). A pressure detection component (6) is provided on the right side of the control computer (1). The pressure detection component (6) includes a press (601). A support steel plate (602) is provided at the lower part inside the press (601). Two layers of abrasive cloth (603) are placed on the upper surface of the support steel plate (602). A load distribution plate (604) is placed above the uppermost layer of the abrasive cloth (603). A bearing steel plate (605) is provided above the load distribution plate (604). A bearing head (606) is connected to the middle of the upper surface of the bearing steel plate (605). A loading head (607) is provided directly above the bearing head (606). The loading head (607) is connected to the upper part inside the press (601). Three displacement sensors (608) are provided on the upper surface of the support steel plate (602).

2. The low-temperature static stiffness test device for an under-rail pad according to claim 1, wherein: The size of the abrasive cloth (603) is smaller than the size of the support steel plate (602).

3. The low-temperature static stiffness test device for an under-rail pad according to claim 1, wherein: The displacement sensor (608) includes a base (6081) placed on the upper surface of the support steel plate (602). A probe (6083) is connected above the base (6081) through a connecting rod (6082).

4. The low-temperature static stiffness test device for an under-rail pad according to claim 1, wherein: The control computer (1) is electrically connected to the pressure detection component (6) and the displacement sensor (608).

5. The low-temperature static stiffness test device for an under-rail pad according to claim 1, characterized in that: An elastic cushion plate (7) can be placed between the two layers of the abrasive cloth (603).

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