Railway wagon temperature monitoring device

Abstract

The railway wagon temperature monitoring device comprises a tee joint, a temperature measuring plug is arranged at a third port of the tee joint, the temperature measuring plug comprises a plug body, a through plug body first round hole is formed in the plug body, and a first fusible filling body located on the exhaust port side of the first round hole is arranged in the plug body first round hole; a second fusible filling body located on the air inlet side of the first round hole is arranged in the first round hole of the plug body, and the melting point temperature of the first fusible filling body is equal to or higher than the maximum allowable temperature of the non-metal part of the truck. The melting point temperature of the second fusible filling body is equal to or higher than the sum of the maximum allowable temperature of the truck nonmetal part and the tolerance value of the melting point temperature of the first fusible filling body. The temperature measurement plug has the beneficial effects that the double-melting-point fusible alloy temperature measurement technology is adopted, the same round hole of the temperature measurement plug is filled with the high-melting-point fusible alloy and the low-melting-point fusible alloy in a segmented mode, the leakage problem possibly generated by the temperature measurement plug at the highest permissible temperature of a truck is solved, and safety risks are eliminated.

Description

Technical Field

[0001] The present application relates to a railway train supporting device, and specifically to a railway freight car temperature monitoring device. Background Art

[0002] Railway freight cars use a variety of non-metallic parts such as rubber in their brakes and bogies. Currently, the railway industry stipulates that the maximum ambient temperature for the safe operation of these non-metallic parts is 110°C. In severe cold weather below 0°C, when the moisture content of coal is high, the coal particles and coal blocks loaded on coal trucks are easily frozen into the carriages and cannot be unloaded. Coal trucks need to be driven into the thawing warehouse to heat up, melt the frozen coal, and then unload the coal. Since the thawing warehouse is very long, the temperature inside the warehouse is not uniform when the coal trucks are heated and thawed. The temperature in some areas may exceed 110°C, and the non-metallic parts of the trucks may suffer thermal damage.

[0003] At present, most railway freight cars do not have power supply and power supply lines, so electronic temperature measuring devices cannot be used. The melting point temperature tolerance of fusible alloys is up to ±1°C, and the melting point accuracy is high. Fusible alloys can be used to make small-sized temperature sensing elements, such as temperature measuring screw plugs embedded with fusible alloys, which can be installed on the brake pipes of freight cars to detect the ambient temperature of freight cars.

[0004] The study found that when the ambient temperature rises slowly and approaches the melting point of the fusible alloy, the thin layer of fusible alloy close to the inner wall of the discharge hole in the temperature measuring screw plug melts first, causing tiny pores in the fusible alloy filling area. The discharge hole will leak a small amount under the action of the pressurized gas. Although visual inspection shows no obvious changes in the appearance of the temperature measuring screw plug, for example, the fusible alloy filled in the exhaust port of the discharge hole is still intact, and there is no melting or falling of the fusible alloy, the temperature measuring screw plug has actually entered a failed state, and the sealing of the gas path has begun to be damaged. At this time, if the truck equipped with the temperature measuring screw plug continues to run, it may cause a traffic safety accident. In addition, when the truck brakes and releases, the brake pipe pressure changes between zero and the maximum value. When the brake pipe pressure is zero, the fusible alloy in the temperature measuring screw plug melts and may flow into the brake pipe and block the pipe. Summary of the invention

[0005] The purpose of the present application is to provide a railway freight car temperature monitoring device, which solves the problem of temperature monitoring of railway train braking devices without power supply.

[0006] The purpose of this application is achieved through the following technical solutions:

[0007] A railway freight car temperature monitoring device comprises a tee, wherein the first and second ports of the tee are brake pipe connection ends, a temperature measuring plug is arranged at the third port of the tee, the temperature measuring plug comprises a plugging body, a first circular hole of the plugging body is arranged on the plugging body, the first circular hole of the plugging body comprises a first circular hole air inlet and a first circular hole exhaust port, the first circular hole air inlet is connected with the internal channel of the tee, a first fusible filling body located on the first circular hole exhaust port side is arranged in the first circular hole of the plugging body, a second fusible filling body located on the first circular hole air inlet side is arranged in the first circular hole of the plugging body, the melting point temperature of the first fusible filling body is equal to or higher than the maximum allowable temperature of non-metallic parts of the freight car, and the melting point temperature of the second fusible filling body is equal to or higher than the sum of the maximum allowable temperature of non-metallic parts of the freight car and the tolerance value on the melting point temperature of the first fusible filling body.

[0008] Furthermore, the blocking body comprises a blocking body right prism, a blocking body cylinder and a blocking body stud which are sequentially arranged along the center line of the blocking body, and the first circular hole of the blocking body is arranged along the center line of the blocking body.

[0009] Furthermore, the blocking body is provided with a second circular hole, the second circular hole of the blocking body is connected to the first circular hole of the blocking body, a round pin is provided in the second circular hole of the blocking body, the first fusible filling body is located between the end face where the exhaust port of the first circular hole is located and the end face where the inner contour of the second circular hole of the blocking body is located, and the second fusible filling body is located between the end face where the inner contour of the second circular hole of the blocking body is located and the end face where the air inlet of the first circular hole is located.

[0010] Furthermore, the tee is a flange-type tee, the flange at the third port of the tee is connected to a flange plate, a temperature measuring plug is provided on the flange plate, a flange middle hole is provided in the flange plate, and the flange middle hole is connected between the internal channel of the tee and the first circular hole air inlet.

[0011] Furthermore, the internal channel of the tee includes a tee middle hole, the tee includes a tee middle flange, the tee middle hole is connected to the flange middle hole, and the tee middle flange is connected to the flange.

[0012] Furthermore, the flange comprises a flange rhombus and a flange cylinder arranged in sequence along the center line of the flange, the flange rhombus is connected to the flange of the tee, and the flange cylinder is connected to the temperature measuring plug through the internal thread of the flange.

[0013] Furthermore, the middle hole of the flange includes a fourth circular hole and a fifth circular hole of the flange arranged in sequence along the center line of the flange, the aperture of the fourth circular hole of the flange is smaller than the aperture of the fifth circular hole of the flange, the fourth circular hole of the flange is connected to the internal channel of the tee, and the fifth circular hole of the flange is connected to the air inlet of the first circular hole.

[0014] Furthermore, the first and second ports of the three-way connection are connected to the truck brake pipe at the bottom of the vehicle body, and the first circular hole exhaust port of the temperature measuring plug faces the outside of the vehicle body; when the ambient temperature around the truck body increases from low to high and reaches the tolerance temperature point on the melting point temperature of the first fusible filler, the first fusible filler is completely melted, and the first fusible filler can be seen melting and flowing out from the first circular hole exhaust port; when the ambient temperature continues to rise and reaches above the melting point temperature of the second fusible filler, the second fusible filler quickly melts, breaking through the first circular hole of the plug, releasing the pressurized gas in the truck brake pipe, generating a significant leakage sound, and making it impossible for the truck brake pipe to maintain pressure.

[0015] Furthermore, the temperature measuring plug is arranged at an angle, and the first circular hole exhaust port of the temperature measuring plug is arranged downward.

[0016] Furthermore, the temperature measuring plug is arranged tilted or horizontally, the liquid level formed by the melting of the fusible filling body in the fifth circular hole of the flange is lower than the lowest point of the fourth circular hole of the flange, and the molten liquid of the fusible filling body is blocked by the side wall of the fourth circular hole of the flange.

[0017] Beneficial effects of this application:

[0018] 1. The dual-melting-point fusible alloy temperature measurement technology is adopted to fill the same circular hole of the temperature measuring plug with two fusible alloys with high and low melting points in sections, so as to solve the leakage problem that may be caused by the temperature measuring plug at the highest allowable temperature of the truck and eliminate the safety risk. By setting a small circular hole on the side of the temperature measuring screw plug, the filling length of the high-melting-point fusible alloy can be quickly and accurately controlled.

[0019] 2. The center line of the temperature measuring plug exhaust hole is arranged horizontally or the exhaust port is tilted downward. A through stepped hole with sufficient length is set along the center line of the flange to ensure the ventilation function of the flange, prevent liquid fusible alloy from entering the brake pipe and affecting the braking performance, and facilitate visual inspection of the temperature measuring screw plug status.

[0020] 3. The on-board monitoring mode is adopted to display the difficult-to-observe process events, such as whether the ambient temperature of the railway freight car exceeds the maximum allowable value of the non-metallic parts of the car, through intuitive and visible forms such as melting of fusible alloy, temperature measurement to block exhaust port leakage, and brake pipe pressure drop, thus providing a practical, accurate and low-cost new technical means for freight car temperature monitoring.

[0021] The aforementioned main scheme of the present application and its further options can be freely combined to form multiple schemes, all of which are schemes that can be adopted and claimed for protection in the present application; and in the present application, (non-conflicting options) can also be freely combined with each other and with other options. After understanding the scheme of the present application, those skilled in the art can understand that there are many combinations based on the prior art and common knowledge, all of which are technical schemes to be protected by the present application, and they are not exhaustively listed here. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is the structural front view of this application.

[0023] Figure 2 yes Figure 1 Top view of the .

[0024] Figure 3 It is a side view of the structure of the horizontal arrangement of the present application.

[0025] Figure 4 It is a side view of the structure of the present application arranged obliquely.

[0026] Figure 5 It is a structural side view of the temperature measuring plug of the present application.

[0027] Figure 6 yes Figure 5 Left view of .

[0028] Figure 7 yes Figure 5 AA section view.

[0029] Figure 8 It is a structural stereogram of the flange of the present application (rear view).

[0030] Fig. 9 It is a structural stereogram (front view) of the flange of the present application.

[0031] In the figure: 1-temperature measuring plug, 2-flange, 3-sealing ring, 4-bolt, 5-elastic gasket, 6-tee, 7-truck body, 8-liquid surface formed by melting of fusible alloy, 9-truck brake pipe;

[0032] 1.1-blocking body, 1.2-first fusible filling body, 1.3-second fusible filling body, 1.4-round pin, L1-length of the first filling body, L2-length of the second filling body, L3-distance from the center of the second round hole of the blocking body to the first end face;

[0033] 1.1a-straight prism of the plugging body, 1.1b-cylinder of the plugging body, 1.1c-stud of the plugging body, 1.1d-first circular hole of the plugging body, 1.1e-air inlet of the first circular hole, 1.1f-first end face of the plugging body, 1.1g-second circular hole of the plugging body, 1.1h-air outlet of the first circular hole, 1.1j-center line of the plugging body;

[0034] 2a-flange rhombus, 2b-flange third circular hole, 2c-flange second end face, 2d-square ring groove, 2e-flange fourth circular hole, 2f-flange cylinder, 2g-flange center line, 2h-flange third end face, 2j-flange fifth circular hole, 2k-flange internal thread, 2m-fourth circular hole side wall;

[0035] 6.1-middle hole of tee, 6.2-middle flange of tee, 6.1a-axis of middle hole;

[0036] 7a-bottom of the vehicle body, 7b-outer side of the vehicle body. DETAILED DESCRIPTION

[0037] The following non-limiting examples are provided to illustrate the present application.

[0038] Example 1

[0039] refer to Figures 1 to 9 As shown, a railway freight car temperature monitoring device includes a temperature measuring plug 1, a flange 2, a sealing ring 3, a bolt 4, an elastic gasket 5 and a tee 6.

[0040] An internal channel is provided in the tee 6, and the internal channel is connected to the three ports of the tee 6 respectively. The first and second ports of the tee 6 are brake pipe connection ends, so that the tee 6 is connected to the truck brake pipe 9. A temperature measuring plug 1 is provided at the third port of the tee 6, and the temperature measuring plug 1 is used to monitor the ambient temperature. When the ambient temperature is higher than the maximum allowable temperature of the non-metallic parts of the truck, the fusible filling body in the temperature measuring plug 1 melts, and the melted fusible filling body flows out of the temperature measuring plug 1 to warn. At the same time, the temperature measuring plug 1 is connected due to the melting of the filling body, and the truck brake pipe 9 is connected to the atmosphere, and the discharged gas also warns.

[0041] The temperature measuring plug 1 includes a plug body 1.1, a first fusible filling body 1.2, a second fusible filling body 1.3 and a round pin 1.4. The plug body 1.1 is provided with a first round hole 1.1d of the plug body that passes through along the center line 1.1j of the plug body, and the first round hole 1.1d of the plug body includes a first round hole air inlet 1.1e and a first round hole exhaust port 1.1h, and the first round hole air inlet 1.1e is connected to the internal channel of the tee 6, and the first round hole 1.1d of the plug body is provided with a first fusible filling body 1.2 located on the side of the first round hole exhaust port 1.1h, and the first round hole 1.1d of the plug body is provided with a second fusible filling body 1.3 located on the side of the first round hole air inlet 1.1e, and at room temperature, the first fusible filling body and the second fusible filling body are seamlessly fitted with the first round hole of the plug body, and the first round hole of the plug body can be reliably sealed.

[0042] The melting point temperature of the first fusible filler 1.2 is equal to or higher than the maximum allowable temperature of the non-metallic parts of the truck, the melting point temperature of the second fusible filler 1.3 is equal to or higher than the sum of the maximum allowable temperature of the non-metallic parts of the truck and the tolerance value of the melting point temperature of the first fusible filler 1.2, the first fusible filler 1.2 and the second fusible filler 1.3 are both made of fusible alloys, the first fusible filler 1.2 is melted first as a low melting point alloy, and the second fusible filler 1.3 is melted later as a high melting point alloy.

[0043] The plug 1.1 includes a plug straight prism 1.1a, a plug cylinder 1.1b and a plug stud 1.1c which are arranged in sequence along the plug center line 1.1j, and a first plug circular hole 1.1d which passes through the plug is provided along the plug center line 1.1j. Among them, the plug cylinder 1.1b has a smaller outer diameter and is used to isolate the plug straight prism 1.1a and the plug stud 1.1c. The diameter profile of the right prism is larger than that of the cylinder, and its cross section is a polygon, which is convenient for tools such as wrenches to load and unload the temperature measuring plug. The plug stud 1.1c realizes the screw installation of the plug 1.1. The inner end face (close to the second fusible filling body) of the plug 1.1 is the first end face 1.1f of the plug, and the outer end face (close to the first fusible filling body) is the second end face of the plug.

[0044] The plugging body 1.1 is provided with a second circular hole 1.1g, which is opened according to the distance L3 from the center of the second circular hole of the plugging body to the first end face calculated in advance. A round pin 1.4 is provided in the second circular hole 1.1g of the plugging body to seal the second circular hole. The second circular hole 1.1g of the plugging body is connected to the first circular hole 1.1d of the plugging body. The second circular hole 1.1g of the plugging body is vertically connected to the first circular hole 1.1d of the plugging body and has a slightly smaller diameter. The second circular hole is provided for the perfusion of the filling body. The distance L3 from the center of the second circular hole of the plugging body to the first end face is slightly larger than the length L2 of the second filling body, which is convenient for controlling the length of the second filling body.

[0045] During pouring, the first end face of the plugging body is placed on the platform with the first end face facing downwards, and the high melting point fusible alloy block is heated and melted, and then injected into the first circular hole from the exhaust port of the first circular hole. When the fusible alloy liquid flows out of the second circular hole, the pouring is stopped, and the high melting point fusible alloy poured into the first circular hole is cooled to form a second fusible filling body. The fusible alloy in the second circular hole is taken out with a drill bit or other tools, and the second circular hole is sealed with a round pin. The first end face of the plugging body is then placed on the platform with the first end face facing downwards, and the low melting point fusible alloy block is heated and melted, and then injected into and filled the first circular hole, and the low melting point fusible alloy poured into the first circular hole is cooled to form a first fusible filling body.

[0046] Thus, the first fusible filling body 1.2 is located between the end face where the exhaust port 1.1h of the first circular hole is located (the first end face of the plugging body) and the end face where the inner contour of the second circular hole 1.1g of the plugging body is located (the innermost position and perpendicular to the center line of the plugging body), and the second fusible filling body 1.3 is located between the end face where the inner contour of the second circular hole 1.1g of the plugging body is located and the end face where the air inlet 1.1e of the first circular hole is located (the second end face of the plugging body), that is, the first fusible filling body formed by pouring low-melting-point fusible alloy is arranged at the exhaust port end of the first circular hole of the plugging body, and the second filling body formed by pouring high-melting-point fusible alloy is arranged at the air inlet end in the first circular hole. And ensure that the length L2 of the second fusible filling body is greater than the length L1 of the first fusible filling body.

[0047] The outer diameter of the round pin 1.4 is slightly larger than the diameter of the second circular hole 1.1g of the plugging body, and can form an interference fit with the second circular hole 1.1g of the plugging body. After the high-melting-point fusible alloy forms the second fusible filling body, the round pin is used to firmly seal the second circular hole 1.1g of the plugging body to ensure that after the first fusible filling body and the second fusible filling body are melted, they both flow out from the first circular hole of the plugging body, which is convenient for observation and inspection.

[0048] The internal passage of the tee 6 includes a tee middle hole 6.1, the middle hole axis 6.1a of the tee middle hole 6.1 is arranged horizontally or inclined, and the tee 6 includes a tee middle flange 6.2. The tee 6 is a flange-type tee, and the first port and the second port of the tee 6 both have flanges for connection. The flange at the third port (middle port) of the tee 6 is connected to the flange 2, that is, the tee middle hole 6.1 is connected to the flange middle hole, and the tee middle flange 6.2 is connected to the flange 2.

[0049] The temperature measuring plug 1 is provided on the flange 2, that is, the temperature measuring plug 1 is connected and communicated at the third port of the tee by using the flange 2. A flange middle hole is provided in the flange 2, and the flange middle hole communicates between the internal channel of the tee 6 and the first circular hole air inlet 1.1e.

[0050] The flange 2 includes a flange rhombus 2a and a flange cylinder 2f arranged in sequence along the flange center line 2g. The flange rhombus 2a is connected to the flange of the tee 6, and the flange cylinder 2f is connected to the temperature measuring plug 1 through the flange internal thread 2k, so that the temperature measuring plug is fixed on the flange cylinder through threads.

[0051] The flange 2 is a structure composed of a thinner flange rhombus 2a and a longer flange cylinder 2f with a smaller outer diameter. The inner end face of the flange rhombus 2a is the second end face 2c of the flange, and the outer end face of the flange cylinder 2f is the third end face 2h of the flange. There is a third flange hole 2b at each of the sharp corners of the flange rhombus 2a, which is used to install fasteners for fixing the flange. The bolt 4 passes through the third flange hole 2b and is connected to the tee 6 to fix the flange 2 on the tee 6. An elastic gasket 5 is respectively put on the two bolts, and the bolt passes through the third circular hole to fix the flange on the outer side of the middle flange of the flange tee. A square ring groove 2d (square in cross section) with a larger diameter is opened on the second end face 2c of the flange rhombus 2a, which is used to accommodate the sealing ring 3. An annular sealing ring is installed in the square ring groove 2d to ensure reliable sealing between the flange and the flange tee.

[0052] The middle hole of the flange includes the fourth circular hole 2e and the fifth circular hole 2j of the flange, which are arranged in sequence along the center line 2g of the flange. The aperture of the fourth circular hole 2e of the flange is smaller than the aperture of the fifth circular hole 2j of the flange. The fourth circular hole 2e of the flange is connected to the internal channel of the tee 6, and the fifth circular hole 2j of the flange is connected to the air inlet 1.1e of the first circular hole. The airflow in the brake pipe is guided to the air inlet of the temperature measuring plug through the middle hole of the flange tee, the fourth circular hole and the fifth circular hole of the flange. A sealing internal thread matching the external thread of the temperature measuring plug is provided at the fifth circular hole near the third end face, which is used to fix the temperature measuring plug and form a connection seal.

[0053] The fourth circular hole and the fifth circular hole of the flange plate form a stepped hole that penetrates the flange plate, wherein the fourth circular hole penetrates the second end face of the flange plate, and the fifth circular hole penetrates the third end face of the flange plate. The diameter of the fourth circular hole is significantly smaller than that of the fifth circular hole, so that the fourth circular hole side wall 2m of the fourth circular hole 2e of the flange plate has a high-position blocking effect, preventing the fusible alloy in the temperature measuring plug from melting and flowing back into or blocking the brake pipe. In addition, the flange cylinder and the fifth circular hole have sufficient length. When the center line of the flange plate is in a horizontal position, even if the first fusible filling body and the second fusible filling body are completely melted and flow into the fifth circular hole, the liquid level 8 formed by the melting of the fusible alloy is always lower than the lowest point of the fourth circular hole. The liquid fusible alloy is blocked by the fourth circular hole side wall 2m and will not flow into the middle hole of the flange-type tee and the brake pipe.

[0054] The first and second ports of the tee 6 are connected to the truck brake pipe 9 at the bottom 7a of the vehicle body, and the flanges of the first and second ports are connected and fixed to the flange of the truck brake pipe 9 by bolts 4. The axis of the tee middle hole 6.1 of the tee 6 is arranged horizontally or tilted downward, but cannot be tilted upward to prevent the fusible filler from flowing back into the brake pipe after melting. The tee middle hole 6.1 of the flange 2 faces the outside of the vehicle body 7b, so that the first circular hole exhaust port 1.1h of the temperature measuring plug 1 faces the outside of the vehicle body 7b, which is convenient for personnel outside the vehicle body to easily check the temperature measuring plug 1.

[0055] When the ambient temperature around the truck body 7 approaches the maximum allowable temperature of non-metallic parts from low to high, even if the first fusible filler of the temperature measuring plug melts slightly and tiny pores appear, because the ambient temperature has not yet reached the melting temperature of the second fusible filler (high melting point fusible alloy), the second fusible filler in the first circular hole is still sealed intact, and there will be no gas leakage in the temperature measuring plug, avoiding the safety risk caused by this temperature point. When the ambient temperature continues to rise and reaches the tolerance temperature point of the melting point temperature of the first fusible filler 1.2, the first fusible filler 1.2 is completely melted, and the first fusible filler 1.2 can be seen to melt and flow out from the first circular hole exhaust port 1.1h, which is convenient for visual inspection. When the ambient temperature continues to rise and reaches above the melting point temperature of the second fusible filler 1.3, the second fusible filler 1.3 quickly melts, opens the first circular hole 1.1d of the plug, and releases the pressurized gas in the truck brake pipe 9, producing a significant leakage sound, and making it impossible for the truck brake pipe 9 to maintain pressure. This method makes difficult-to-identify truck over-temperature failures visible and easy to identify in a variety of ways, making it easier for truck inspectors to discover and identify them, and to promptly repair and eliminate the risks of over-temperature failure of non-metallic parts of trucks.

[0056] The temperature measuring plug 1 is arranged obliquely, and the first circular hole exhaust port 1.1h of the temperature measuring plug 1 is arranged downwardly, so that the fusible filler can flow downward under the action of its own gravity after melting, and will not flow back into the brake pipe. Alternatively, the temperature measuring plug 1 is arranged obliquely or horizontally, and the liquid level formed by the melting of the fusible filler in the fifth circular hole 2j of the flange (the liquid level 8 formed by the melting of the fusible alloy) is lower than the lowest point of the fourth circular hole 2e of the flange, and the melted liquid of the fusible filler is blocked by the side wall of the fourth circular hole 2e of the flange. Even in a horizontal state, the fusible filler is blocked after melting, and will not flow back.

[0057] After the railway freight car installed with the device is thawed in the thawing warehouse, the brake pipe of the freight car is inflated, and the inspector checks the state of the first filling body in the exhaust port of the first round hole of the temperature measuring plug. If there is no obvious change in the appearance of the first filling body and there is no leakage sound at the exhaust port, it indicates that the thawing temperature of the car is within the normal range. If it is found that the first filling body in the first round hole of the temperature measuring screw plug is melted and missing, there is a fusible alloy slag block under the temperature measuring plug, there is an air leakage sound at the exhaust port, and the brake line cannot maintain pressure, it indicates that the maximum thawing temperature of the freight car exceeds the maximum allowable temperature of the non-metallic parts of the freight car, and the non-metallic parts on the car may be damaged. The non-metallic parts of the vehicle need to be inspected and repaired, and the damaged temperature measuring plug should be removed, the fusible alloy slag block accumulated in the fifth round hole of the flange should be cleared, and a good temperature measuring plug should be reinstalled.

[0058] The device can avoid the safety risk caused by trace leakage of the first filling body of the temperature measuring plug when the ambient temperature of the truck approaches or reaches the maximum allowable temperature of the non-metallic parts of the truck, eliminate misjudgment, and prevent the fusible alloy from melting and flowing into the brake pipe. The device has a small structure, uses a small amount of fusible alloy, is easy to implement, and has a low cost.

[0059] The aforementioned basic examples and their further selected examples can be freely combined to form multiple embodiments, all of which are embodiments that can be adopted and claimed for protection in this application. In the scheme of this application, each selected example can be arbitrarily combined with any other basic examples and selected examples.

[0060] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A railway freight car temperature monitoring device, comprising a tee (6), characterized in that: The first and second ports of the tee (6) are brake pipe connection ends. A temperature measuring plug (1) is provided at the third port of the tee (6). The temperature measuring plug (1) comprises a plug body (1.1). The plug body (1.1) is provided with a through first circular hole (1.1d) of the plug body. The first circular hole (1.1d) of the plug body comprises a first circular hole air inlet (1.1e) and a first circular hole air outlet (1.1h). The first circular hole air inlet (1.1e) is connected to the internal channel of the tee (6). The first circular hole (1.1d) of the plug body is provided with a first circular hole (1.1e). A first fusible filler (1.2) is provided on the side of the first circular hole exhaust port (1.1h), and a second fusible filler (1.3) is provided in the first circular hole (1.1d) of the plugging body on the side of the first circular hole air inlet port (1.1e). The melting point temperature of the first fusible filler (1.2) is equal to or higher than the maximum allowable temperature of the non-metallic parts of the truck, and the melting point temperature of the second fusible filler (1.3) is equal to or higher than the sum of the maximum allowable temperature of the non-metallic parts of the truck and the tolerance value of the melting point temperature of the first fusible filler (1.2).

2. The railway freight car temperature monitoring device according to claim 1, characterized in that: The plug (1.1) comprises a plug straight prism (1.1a), a plug cylinder (1.1b) and a plug stud (1.1c) arranged in sequence along the plug center line (1.1j), and the first circular hole (1.1d) of the plug is arranged along the plug center line (1.1j).

3. The railway freight car temperature monitoring device according to claim 1, characterized in that: The blocking body (1.1) is provided with a second circular hole (1.1g) of the blocking body, the second circular hole (1.1g) of the blocking body is connected to the first circular hole (1.1d) of the blocking body, a round pin (1.4) is provided in the second circular hole (1.1g) of the blocking body, the first fusible filling body (1.2) is located between the end face where the exhaust port (1.1h) of the first circular hole is located and the end face where the inner contour of the second circular hole (1.1g) of the blocking body is located, and the second fusible filling body (1.3) is located between the end face where the inner contour of the second circular hole (1.1g) of the blocking body is located and the end face where the air inlet (1.1e) of the first circular hole is located.

4. The railway freight car temperature monitoring device according to any one of claims 1 to 3, characterized in that: The tee (6) is a flange-type tee, the flange at the third port of the tee (6) is connected to the flange (2), a temperature measuring plug (1) is provided on the flange (2), a flange middle hole is provided in the flange (2), and the flange middle hole is connected between the internal channel of the tee (6) and the first circular hole air inlet (1.1e).

5. The railway freight car temperature monitoring device according to claim 4, characterized in that: The internal passage of the tee (6) comprises a tee middle hole (6.1), the tee (6) comprises a tee middle flange (6.2), the tee middle hole (6.1) is connected to the flange middle hole, and the tee middle flange (6.2) is connected to the flange (2).

6. The railway freight car temperature monitoring device according to claim 4, characterized in that: The flange (2) comprises a flange rhombus (2a) and a flange cylinder (2f) arranged in sequence along the flange center line (2g); the flange rhombus (2a) is connected to the flange of the tee (6); and the flange cylinder (2f) is connected to the temperature measuring plug (1) via the flange internal thread (2k).

7. The railway freight car temperature monitoring device according to claim 4, characterized in that: The intermediate hole of the flange comprises a fourth circular hole (2e) and a fifth circular hole (2j) of the flange which are arranged in sequence along the center line (2g) of the flange. The aperture of the fourth circular hole (2e) of the flange is smaller than the aperture of the fifth circular hole (2j). The fourth circular hole (2e) of the flange is connected to the internal channel of the tee (6), and the fifth circular hole (2j) of the flange is connected to the air inlet (1.1e) of the first circular hole.

8. The railway freight car temperature monitoring device according to claim 1, characterized in that: The first and second ports of the three-way connection (6) are connected to the truck brake pipe (9) at the bottom (7a) of the vehicle body, and the first circular hole exhaust port (1.1h) of the temperature measuring plug (1) faces the outside (7b) of the vehicle body; when the ambient temperature around the truck body (7) increases from low to high and reaches the tolerance temperature point of the melting point temperature of the first fusible filler (1.2), the first fusible filler (1.2) is completely melted, and the first circular hole exhaust port (1.1h) shows that the first fusible filler (1.2) is melted and flows out; when the ambient temperature continues to rise and reaches above the melting point temperature of the second fusible filler (1.3), the second fusible filler (1.3) is rapidly melted, opening the first circular hole (1.1d) of the plug, releasing the pressurized gas in the truck brake pipe (9), generating a significant leakage sound, and making it impossible for the truck brake pipe (9) to maintain pressure.

9. The railway freight car temperature monitoring device according to claim 1 or 8, characterized in that: The temperature measuring plug (1) is arranged obliquely, and the first circular hole exhaust port (1.1h) of the temperature measuring plug (1) is arranged downward.

10. The railway freight car temperature monitoring device according to claim 7 or 8, characterized in that: The temperature measuring plug (1) is arranged obliquely or horizontally, and the liquid level formed by the melting of the fusible filling body in the fifth circular hole (2j) of the flange is lower than the lowest point of the fourth circular hole (2e) of the flange, and the melted liquid of the fusible filling body is blocked by the side wall of the fourth circular hole (2e) of the flange.

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