KR102190290B1 - Overheat detecting apparatus for railway vehicle - Google Patents

Abstract

The present invention relates to an apparatus for detecting overheat for a railway vehicle, which includes: a casing demounted from and mounted on a heating portion; a sleeve arranged in a receiving groove at one end side of the casing to be movable in a direction of a shaft line; a support bolt limiting movement of the sleeve in the receiving groove of the casing; an elastic member arranged between the receiving groove of the casing and the sleeve; and a ring-shaped molten stopper arranged between a head part of the support bolt and a stepped part in the sleeve. Therefore, the apparatus for detecting overheat for a railway vehicle can recognize an overheating state of the overheating portion of the railway vehicle with the naked eye.

Description

Overheat detecting apparatus for railway vehicle

The present invention relates to an overheat detection device for a railroad vehicle, and more particularly, to an overheat detection device for a railroad vehicle capable of recognizing an overheating condition in a wheel-set bearing of a railroad vehicle.

In general, a traveling bogie of a railroad vehicle transmits power to the wheels through an axle to rotate the wheels on a rail to drive.As shown in FIG. 1, a wheel shaft consisting of a wheel 110 and an axle (not shown) and an axle The journal box 120, which is installed at both ends to accommodate the wheel shaft bearings that rotatably support the journal of the axle, the bogie frame 130, which is fixed to the top of the journal box 120 to support the vehicle body, and the vibration transmitted from the wheel It consists of a suspension spring 140, etc. interposed between the bogie frame and the journal box to attenuate.

As described above, the journal box 120 is generally filled with lubricating oil while disposing a wheel bearing to ensure high-speed rotation of the axle therein. The journal box is bolted tightly to the openable axle cover 122 with bolts 121.

The traveling bogie of a railroad vehicle increases the temperature of the journal box due to excessive rotational friction between the wheel 110 and the axle while traveling at high speed, due to leakage of lubricant, etc., resulting in damage to the wheel shaft bearing or deformation of the axle.

Accordingly, in order to check the overheating phenomenon occurring in the journal box, the traveling bogie of a railroad vehicle, as in Patent Document 1, proposes an overheating notification device mounted on a heating part of a gearbox or journal box. The overheating notification device of Patent Document 1 is configured to visually check the overheating phenomenon by melting the melting plug by the heat conducted from the heating area and firing the projectile to the outside in the housing. Such an overheating notification device allows the projectile to be suspended from the housing by the notification ribbon, so that the projectile and the elastic body can be easily separated and removed by an external collision, and there is a problem that the fluttering notification ribbon is unexpectedly inserted into the surrounding components.

Korean Patent Registration No. 10-1679335

The present invention was created to solve the above-described problem, and by using the melting property of a low melting point fusible alloy due to overheating of a railroad vehicle, it is possible to reliably recognize the overheating state of the wheel shaft bearing with the naked eye. It aims to provide an overheat detection device.

In addition, the present invention ensures a reliable fastening state between the respective constituent members.

In order to achieve the above object, the overheat detection device for a railroad vehicle according to a preferred embodiment of the present invention has a receiving groove formed concave in the axial direction at one end and a female screw hole formed to communicate in the axial direction at the bottom of the receiving groove, , A casing detachable to the heating part; A sleeve having a hollow cylindrical cylindrical side portion, a bottom portion for perforating a through hole and finishing the other end side of the side portion, and an inner step portion formed around an inner circumferential surface of the side portion, and being movably accommodated in the receiving groove in the axial direction; A support bolt having a head portion and a male screw portion extending in length at the other end of the head portion and forming a spiral on an outer circumferential surface thereof, and restricting movement of the sleeve in the receiving groove; An elastic member disposed between the sleeve and the receiving groove of the casing; And an annular melting stopper disposed between the head portion of the support bolt and the inner step portion of the sleeve. Here, in the present invention, when overheating occurs, the sleeve is forcibly protruded from the outside in the receiving groove with the elastic force of the elastic member while releasing the occlusal state between the inner stepped portion and the head through melting of the annular melting stopper. It can be configured to recognize.

In an embodiment of the present invention, the casing includes a body portion; A skirt portion integrally provided at one end of the body portion; A receiving groove formed concave in the axial direction from the center of the skirt portion; And a female screw hole formed concave in the axial direction in the inner region of the bottom surface of the receiving groove.

In an embodiment of the present invention, the sleeve includes a side portion in the shape of a hollow cone and a small hollow portion arranged in a line; A bottom portion for closing the other end of the side portion adjacent to the small hollow portion; And an inner stepped portion formed around an inner circumferential surface of the side portion to partition the public hole portion and the small hollow portion.

Optionally, the sleeve can form an outer step along the periphery of the outer circumferential surface of the side.

Preferably, the sleeve may be made of an aluminum material. In addition, the casing and the support bolt can be made of a metal material with high thermal conductivity.

In an embodiment of the present invention, the outer diameter of the head portion may have a size smaller than the inner diameter of the large hole portion and the inner diameter of the small hollow portion, while the outer diameter of the head portion may have a size larger than the inner diameter of the through hole.

In addition, the present invention may further include an end cap closing the receiving groove opening of the casing.

In another embodiment of the present invention, the support bolt may further include one or more opening guide grooves in the longitudinal direction along the circumferential direction on the outer peripheral surface of the male thread.

Features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings.

Prior to this, terms or words used in the present specification and claims should not be interpreted in a conventional and dictionary meaning, and the inventor may appropriately define the concept of the term in order to describe his or her invention in the best way. It should be interpreted as a meaning and concept consistent with the technical idea of the present invention based on the principle that there is.

According to the above description of the present invention, the present invention provides a detachable overheat detection device so as to visually recognize an overheating state in a heating part of a railroad vehicle by means of the melting property of a low melting point of a fusible alloy.

The present invention releases the occlusal state between the sleeve and the support bolt through melting of the melting stopper when overheating occurs, and by forcibly moving the sleeve to protrude to the outside by the elastic force of the elastic member, the operator can visually check the abnormal overheat state in the railway vehicle. Can be provided, and burnout accidents can be prevented in advance through prompt follow-up measures.

In particular, the present invention can prevent unexpected separation of the sleeve from the casing by limiting the movement of the sleeve through the support bolt.

1 is a side view schematically showing a running bogie of a railroad vehicle.
2 is a perspective view schematically showing an overheat detection device for a railroad vehicle according to a preferred embodiment of the present invention.
3 is an exploded perspective view of an overheat detection device for a railroad vehicle according to a preferred embodiment of the present invention as viewed from the front side, in which some major parts are partially cut to confirm the internal structure.
4 is an exploded perspective view as viewed from the rear side of an overheat detection device for a railroad vehicle according to a preferred embodiment of the present invention.
5 is a cross-sectional view schematically showing an overheat detection device for a railroad vehicle according to a preferred embodiment of the present invention. It is a diagram showing an overheat detection device for a railroad vehicle under an overheat condition.
6 is a partial cut-away view schematically showing an overheat detection device for a railway vehicle according to another embodiment of the present invention.

Objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and embodiments in connection with the accompanying drawings. In adding reference numerals to elements of each drawing in the present specification, it should be noted that, even though they are indicated on different drawings, only the same elements are to have the same number as possible. In addition, in describing the present invention, when it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. In this specification, terms such as first and second are used to distinguish one component from other components, and the component is not limited by the terms. In the accompanying drawings, some components are exaggerated, omitted, or schematically illustrated, and the size of each component does not entirely reflect the actual size.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The overheat detection device for a railroad vehicle according to a preferred embodiment of the present invention is a bolting fastening of the bolt 121 so that the axle cover 122 can be attached and detached on the journal box 120, which is a heating part of the traveling truck shown in FIG. It can be mounted on a bolt ball (not shown) to help. The present invention is not limited thereto, and the present invention is fixed at various heating parts such as gearboxes and RCT bearings that may abnormally overheat during driving of a railroad vehicle, so that the overheating state can be visually recognized.

2 to 4, an overheat detection device for a railroad vehicle (hereinafter, an overheat detection device) according to a preferred embodiment of the present invention includes a casing 1 that is detachable to the heating area and an accommodation groove at one end of the casing. A sleeve (2; sleeve) arranged to be movable within a predetermined range in the axial direction, a support bolt (3) that restricts the movement of the sleeve (2) in the receiving groove of the casing (1), and the receiving groove and sleeve of the casing And an elastic member 4 disposed therebetween, and an annular melting stopper 5 disposed between the head portion of the support bolt 3 and the inner stepped portion of the sleeve.

The casing 1 is made of a material with high thermal conductivity in order to efficiently transfer the heat generated from the heating portion to the inside of the casing, and provides a space for accommodating members constituting the overheat detection device therein. 11), and a skirt part 12 integrally provided at one end of the body part 11, and a receiving groove 13 formed concave in the axial direction from the center of the skirt part 12, which has high thermal conductivity. Can be formed. Here, the skirt portion 12 may be a bolt head extended to a size larger than the outer diameter of the body portion, and the insertion depth of the casing may be limited by surface contact with the heating portion formed with the bolt hole.

The body portion 11 is fixed to the location of the heat generating portion of the railway vehicle, for example, a male screw thread may be formed on the outer circumferential surface so as to be mounted and/or removed by a bolting method in the bolt hole of the journal box 120 (see FIG. 1). As shown, the skirt part 12 can be tightened using a spanner to assemble the casing in the bolt hole of the journal box.

As described above, the casing 1 forms a receiving groove 13 in a size and shape capable of accommodating the sleeve 2 and the elastic member 4 at one end thereof, inside the bottom surface of the receiving groove 13 It is provided with a female threaded hole (14) concave in the axial direction in the region. The female screw holes 14 form a female thread on the inner circumferential surface thereof and have an inner diameter size smaller than the inner diameter of the receiving groove 13, and are arranged in a row to communicate with each other in a coaxial line with the center of the receiving groove.

Optionally, the casing 1 may further include an annular projection 15 extending in the axial direction on the skirt portion 12 along the periphery of the receiving groove 13.

The sleeve 2 is coupled with a support bolt 3 so as to move forward in the axial direction toward the outside by means of the elastic force of the elastic member 4 in the receiving groove 13 of the casing 1. The sleeve 2 includes a hollow hollow barrel-shaped side portion 21 and a bottom portion 22 that ends at the other end of the side portion 21. The outer diameter of the side part 21 is smaller than or equal to the inner diameter of the receiving groove 13 so as to ensure the sliding movement of the sleeve within the receiving groove. In addition, the sleeve 2 provides a through path for the support bolt 3 by drilling a through hole 221 penetrating in the thickness direction along the axial direction in the bottom part 22 of the sleeve 2, which communicates with the hollow part formed inside the sleeve. It is formed in a pot shape as possible.

In addition, the sleeve 2 defines a hollow portion 23a, 23b with a side portion 21 and a bottom portion 22, and the hollow portion 23a having a relatively large inner diameter adjacent to one end side of the sleeve and the other end side of the sleeve In other words, small hollow portions 23b having a relatively small inner diameter adjacent to the bottom are arranged in a row so as to communicate with each other in a coaxial line. The sleeve 2 is an inner stepped portion 24 formed along the circumference of the inner circumferential surface of the side portion 21 and may divide the boundary between the public hole 23a and the small hollow portion 23b.

The overheat detection device according to an embodiment of the present invention can maintain a reliable interview condition with the inner surface of the receiving groove 13 of the casing 1 against abnormal overheating generated in the journal box, and at the same time, to the annular melting stopper 5 It is preferable to fabricate the sleeve 2 of a metal having high thermal conductivity, such as aluminum, so as to efficiently and rapidly transfer heat. In addition, the sleeve 2 may be made of an aluminum material having excellent processability and may provide an advantage of being able to be easily molded as shown in the illustrated shape.

The elastic member 4 may be a compression coil spring interposed between the other end of the sleeve 2 and the receiving groove 13. Of course, the elastic member 4 may be any pressing member capable of forcibly pushing the sleeve disposed in the receiving groove of the casing in the axial direction toward the outside of the front side.

As shown, the elastic member 4 is disposed so as to surround the other end of the side portion 21 of the sleeve 2, specifically the outer peripheral surface of the bottom portion 22, and the bottom surface of the bottom portion 22 of the sleeve 2 and It is possible to provide a good interview condition between the bottom surfaces of the receiving grooves 13. To this end, the sleeve 2 forms an outer stepped portion 25 along the periphery of the outer circumferential surface of the side, and inserts the elastic member 4 around the small diameter portion of the other end of the side so that the elastic member is contracted and/ Alternatively, it is possible to ensure the movement of the sleeve from the bottom of the receiving groove by interlocking with the expansion.

The overheating device according to the present invention may position the sleeve 2 together with the elastic member 4 in the receiving groove 13 of the casing 1 through bolt fastening of the support bolt 3. The support bolt 3 is made of a head 32 and a male screw portion 31 extending in length at the other end of the head portion 32 and having a spiral formed on the outer circumferential surface thereof, and the male screw portion 31 of the support bolt is annularly melted. It can be fastened and fixed to the female threaded hole 14 of the casing by penetrating the hollow portion of the stopper 5 and crossing the public hole, small hollow portion, and through hole of the sleeve 2. The support bolt 3 tightens the annular melting stopper 5 to the other end side of the head part 32 until it is supported and held on the inner stepped part 24 of the sleeve 2.

The head portion 32 is formed to have a size larger than the diameter of the length-extended male screw portion 31 to form a locking projection in the circumferential direction at an intersection between the head portion and the male screw portion. In addition, the head portion forms a polygonal groove (no reference numeral) formed concave in the axial direction at the center of one side. The polygonal groove helps to tighten or loosen the support bolt into the female thread of the casing through a variety of tools such as a hexagon wrench, a Phillips screwdriver, and a single screwdriver.

Specifically, the outer diameter of the head portion 32 has a size smaller than the inner diameter of the hollow portion 23a and the inner diameter of the small hollow portion 23b while having a size larger than the inner diameter of the through hole 221. Thereby, the sleeve 2 reliably prevents the sleeve 2 from detaching from the casing while ensuring the sliding movement within the separation distance between the bottom surface of the receiving groove 13 and the head portion 32 of the support bolt 3 can do. In addition, in the present invention, in order to provide a separation distance between the bottom surface of the receiving groove and the head of the support bolt, the length of the male thread part 31 of the support bolt 3 is reduced to the depth of the small hollow part 23b and the bottom part 22 of the sleeve. It should be greater than the sum of the thickness and the thickness of the melt stopper 5.

In the present invention, as described above, not only can the sleeve 2 be fixed in position in the receiving groove 13 of the casing 1 but also overheated by means of an annular melting stopper 5 using a low melting point fusible alloy material. Upon occurrence, the annular melting stopper 5 is melted to release the state of occlusion with the inner step portion 24 of the sleeve 2 and/or the head portion 32 of the support bolt 3 to release the elastic member 4 ), the sleeve 2 can be forcibly moved forward.

As widely known to those skilled in the art, the journal box 120 (shown in Fig. 1), which is a heat generating part of a railroad vehicle, is managed by considering a temperature of 90°C or less as a normal state, and the surface of the journal box is waiting while driving It does not exceed 50℃ by air cooling through contact with. Accordingly, the present invention can set an arbitrary detection temperature (90° C. to 50° C., for example, 70° C.) as a recognition measure for overheating, and apply a fusible alloy that is melted above this detection temperature as a material of the melting stopper 5 can do. That is, the annular melting stopper 5 having a melting temperature of 70° C. can maintain a solid state as shown in Fig. 5(a) below 70° C., whereas the shown in Fig. 5(b) above 70° C. As described above, the position of the sleeve is released due to the phase change to the molten state and not maintaining the original shape.

Optionally, the present invention can close the opening of the receiving groove 13 of the casing 1 on one end side of the casing 1 with an end-cap 6, that is to say. The end cap 6 is formed in a size and shape to cover one end side of the casing, for example, the annular projection 15 as shown in FIG. 5(a) or 6, for example, the forward movement of the sleeve 2 and It is configured to be easily separated from one end of the casing even with the same predetermined external force.

In addition, the end cap 6 is a fixing ring 61 mounted on the locking groove 12 a formed along the circumference of the skirt portion 12, and the end cap 6 and the fixing ring 61 A connection string 62 may be additionally provided. This is because it is placed around the casing even if it is separated from one end of the casing by driving the sleeve of the overheat detection device under overheating, so the number of work to recover the end cap can be significantly reduced, and unnecessary contact opportunities with the traveling bogie of the railway vehicle are prevented in advance. can do.

The overheating detection device for a railroad vehicle according to a preferred embodiment of the present invention is configured to visually identify an overheated state in the heating area due to the temperature of the heating area equipped with it, and the operating principle thereof is shown in FIG. It will be described in detail with reference to.

FIG. 5(a) is a diagram schematically showing an overheat detection device for a railroad vehicle deactivated under a normal state, that is, a temperature lower than the detection temperature.

The overheat detection device according to a preferred embodiment of the present invention includes an annular melting stopper 5 fitted on the outer circumferential surface of the male screw 31 to be interviewed with the other side of the head 32 of the support bolt 3 and a sleeve 2 ), the sleeve 2 can be fixed in position in the receiving groove 13 of the casing 1 because it is overlaid on the inner stepped portion 24 of). This arrangement is accommodated in a contracted state between the sleeve and the bottom of the receiving groove of the casing by resisting the elastic force of the elastic member 4 disposed on the other end of the side of the sleeve 2, and the side 21 of the sleeve 2 ) To maintain a good interview with the inner circumferential surface of the receiving groove (13) of the casing (1), while keeping the bottom (22) of the sleeve (2) with the bottom of the receiving groove (13) of the casing (1). The sleeve is forcibly supported and held in the receiving groove.

5(b) is a diagram schematically showing an overheating detection device for a railroad vehicle activated under an overheating state, that is, a temperature equal to or higher than the detection temperature.

The overheating detection device according to a preferred embodiment of the present invention passes the heat generated in the heating area (for example, a journal box) through the casing 1 through the sleeve 2 and/or the support bolt 3 in an annular melting stopper. Transferred to (5), when the annular melting stopper (5) receives heat higher than a preset detection temperature, it melts. To this end, in the present invention, the casing 1 and the support bolt 3 can be made of a material having high thermal conductivity.

As a result, the molten stopper 5 in the molten state relieves the engagement with the sleeve 2 and pushes the sleeve 2 outward with the elastic force of the elastic member 4 to protrude out from the receiving groove of the casing. Let it be. The end cap 6 may be separated from the casing 1 through a process in which one end of the sleeve 2 protrudes onto one end side of the casing.

In addition, the sleeve 2 is painted on its outer surface in red, for example, so that the operator can easily visually identify the protruding condition of the sleeve to recognize the overheating condition of the journal box.

In the embodiment of the present invention, the melting stopper 5 in the molten state is moved to a gap between the hollow parts 23a and 23b and the head part 32 or between the through hole 221 and the male screw part 31. do.

6 is a partial cut-away view schematically showing an overheat detection device for a railway vehicle according to another embodiment of the present invention. The overheat detection device for a railroad vehicle illustrated in FIG. 6 is another modified example of the overheat detection device illustrated in FIGS. 2 to 4, and has a very similar structure except for the external shape of the support bolt, so a clear understanding of the present invention In order to help, descriptions of similar or identical configurations will be excluded here.

As described above, the overheating detection device according to another embodiment of the present invention is configured to recognize an overheating state in the heating area by using the melting characteristic of the annular melting stopper under the influence of a preset detection temperature. In addition, the overheat detection device according to another embodiment of the present invention provides a guide groove for opening the heat transferred from the journal box to the casing 1 together with the heat transfer path through an interview with the sleeve 2 and/or the support bolt 3 Thermal conductivity can be improved by using (33).

To this end, the support bolt 3 is provided with one or more opening guide grooves 33 in the longitudinal direction along the circumferential direction on the outer circumferential surface of the male screw part 31. The one or more hot air guide grooves 33 directly contact the heat transferred to the casing 1 with the annular melting stopper 5 so that heat transfer can be realized more quickly. The hot air guide groove 33 can be used as an additional heat transfer path as described above, and is used as an escape space for the melting stopper 5 in a molten state, so that the sleeve moves smoothly under an abnormal overheating condition as shown in FIG. 5(b). Can be guaranteed.

In addition, the support bolt may be formed to be spaced apart at equal intervals along the circumferential direction of one or more opening guide grooves 33 on the outer circumferential surface of the male screw part 31.

The present invention has been described in detail through examples, but this is for explaining the present invention in detail, and the overheat detection device for a railroad vehicle according to the present invention is not limited thereto, and within the technical idea of the present invention, general It would be clear that the transformation or improvement is possible by those who have knowledge.

All simple modifications or changes of the present invention belong to the scope of the present invention, and the specific scope of protection of the present invention will be made clear by the appended claims.

1 ----- casing,
2 ----- sleeve,
3 ----- support bolt,
4 ----- elastic member,
5------melt stopper,
6-----end cap,
110 ----- wheel,
120 ----- Journal box,
130 ----- bogie frame,
140 ----- Suspension spring.

Claims (8)

A casing (1) having a receiving groove (13) formed concave in the axial direction at one end and a female threaded hole (14) formed to communicate in the axial direction from the bottom surface of the receiving groove (13), and detachable to the heating portion;
A hollow cylindrical side portion (21), a bottom portion (22) for perforating a through hole (221) and closing the other end of the side portion (22), and an inner stepped portion (24) formed around the inner circumferential surface of the side portion (21) And a sleeve (2) movably accommodated in the receiving groove (13) in an axial direction;
A support bolt (31) having a head portion (32) and a male screw portion (31) extending in length at the other end of the head portion and forming a spiral on the outer circumferential surface, and restricting the movement of the sleeve (2) within the receiving groove (13) ( 3);
An elastic member (4) disposed between the receiving groove (13) of the casing (1) and the sleeve (2); And
Includes; an annular melting stopper (5) disposed between the head portion (32) of the support bolt and the inner stepped portion (24) of the sleeve,
When overheating occurs, when the inner stepped portion 24 and the head portion 32 are released from the mating state by melting of the annular melting stopper 5, the sleeve 2 An overheat detection device for a railroad vehicle to protrude from the inside of the receiving groove 13 with an elastic force. The method according to claim 1,
The casing (1),
A body portion 11;
A skirt portion 12 integrally provided at one end of the body portion 11;
A receiving groove 13 formed concave in the axial direction from the center of the skirt part 12; And
An overheat detection device for a railroad vehicle, comprising a female screw hole 14 formed concave in the axial direction in the inner region of the bottom surface of the receiving groove 13. The method according to claim 1,
The sleeve 2,
A side portion (21) of a hollow cone shape in which the public study portion (23a) and the small hollow portion (23b) are arranged in a line to communicate with each other;
A bottom portion 22 closing the other end of the side portion adjacent to the small hollow portion 23b; And
An overheat detection device for a railroad vehicle having an inner stepped portion 24 formed around an inner circumferential surface of the side portion 21 to partition the public hole portion and the small hollow portion. The method according to claim 1,
The sleeve (2) forms an outer stepped portion (25) along the circumference of the outer circumferential surface of the side portion (21). The method according to claim 1,
The sleeve (2) is made of an aluminum material, overheating detection device for railway vehicles. The method of claim 3,
The outer diameter of the head portion 32 has a size smaller than the inner diameter of the hollow portion (23a) and the inner diameter of the small hollow portion (23b),
The outer diameter of the head portion 32 has a larger size than the inner diameter of the through hole (221), overheating detection device for railway vehicles. The method according to claim 1,
The casing (1) further comprises an end cap (6) for closing the opening of the receiving groove, overheat detection device for a railroad vehicle. The method according to claim 1,
The support bolt (3) further comprises at least one opening guide groove (33) in the longitudinal direction along the circumferential direction on the outer circumferential surface of the male screw portion (31), an overheat detection device for a railway vehicle.

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