CN111232016A - Protective box for track circuit - Google Patents

Abstract

The invention provides a protective box for a track circuit, comprising a box body, a sealing ring and a box cover; the box body opening is provided with a first annular groove, the inner side of the box cover is provided with a pressing part, or the box body opening is provided with a pressing part, The inner side of the box cover is provided with a first annular groove; the pressing part is provided with a first annular protrusion, the sealing ring is fitted in the first annular groove, and the sealing ring is provided with at least two second annular protrusions along the length direction, any adjacent to each other. A second annular groove is formed between the second annular protrusions; the box cover is closed on the opening of the box body, the pressing part is fitted in the first annular groove, and the first annular protrusion is fitted in the second annular groove; the box cover is provided with There is an installation through hole; the sealing ring is completely accommodated in the first annular groove, so as to avoid the dislocation of the sealing ring. After the box cover is closed on the box body, the pressing part fits in the first annular groove, so as to avoid the misalignment caused by the buckle. The seal fails, and the first annular protrusion fits in the second annular groove, so the sealing effect is better.

Description

A kind of protective box for track circuit

technical field

The invention belongs to the field of rail transit equipment, in particular to a protective box for rail circuits.

Background technique

The existing boxes used for the protection of track circuit outdoor equipment can be divided into vertical type and side-lifting type according to the opening method of the box cover. The box cover and the box body are fastened by one or two bolts. The sealing effect is poor and needs to be improved urgently.

SUMMARY OF THE INVENTION

In view of the above problems, the present invention provides a protective box for a track circuit, comprising a box body, a sealing ring and a box cover;

The opening of the box body is provided with a first annular groove, and the inner side of the box cover is provided with a pressing portion, or the opening of the box body is provided with a pressing portion, and the inner side of the box cover is provided with a first annular groove;

The pressing part is provided with a first annular protrusion;

The sealing ring is fitted in the first annular groove, the sealing ring is provided with at least two second annular protrusions along the length direction, and a second annular groove is formed between any adjacent second annular protrusions;

The box cover is closed on the opening of the box body, the pressing part is fitted in the first annular groove, and the first annular protrusion is fitted in the second annular groove;

The box cover is provided with a mounting through hole.

Preferably, the sealing ring is hollow inside.

Preferably, it also includes a bolt and a limit ring;

The sealing ring is provided with a through hole, the limit ring is coaxially fitted in the through hole, and the axial length of the limit ring is smaller than the axial length of the through hole;

The box body and the box cover are connected by bolts, and the middle part of the bolt is located in the limit ring.

Preferably, a groove is formed around the mounting through hole to the outside of the box cover.

Preferably, an installation joint is also included, and the installation joint includes a threaded flange, a stop washer, a sealing ring and a lock nut;

The threaded flange is coaxially fixed in the installation through hole, the stop washer is fitted on the threaded flange, the lock nut is fitted with the threaded flange, the sealing ring is located in the accommodating cavity formed by the lock nut and the threaded flange, and the sealing The ring and locknut abut against the threaded flange.

Preferably, the sealing ring is provided with a plurality of through holes, and the axes of the plurality of through holes are parallel to the axis of the sealing ring.

Preferably, the outer side of the box body and the outer side of the box cover are coated with an ultraviolet absorber.

In the protective box for the track circuit of the present invention, the sealing ring is completely accommodated in the first annular groove, so as to avoid the dislocation of the sealing ring. The seal fails due to the misalignment of the buckle, and the first annular protrusion fits in the second annular groove, so the sealing effect is better.

Other features and advantages of the present invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure pointed out in the description, claims and drawings.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

FIG. 1 shows a perspective view of a protective box provided by an embodiment of the present invention;

FIG. 2 shows a schematic diagram of the sealing cooperation between the box body and the box cover according to the embodiment of the present invention;

FIG. 3 shows a schematic diagram of the sealing cooperation between the box body and the box cover according to the embodiment of the present invention;

FIG. 4 shows a schematic diagram of a bolt and a limit ring proposed in an embodiment of the present invention;

FIG. 5 shows a cross-sectional view of a protective box provided by an embodiment of the present invention;

Fig. 6 shows a partial enlarged view of Fig. 5;

FIG. 7 shows a schematic diagram of the sealing ring proposed by the embodiment of the present invention;

Fig. 8 shows the partial schematic diagram of box cover and lead wire in the prior art;

FIG. 9 shows a partial schematic diagram of a box cover and lead wires according to an embodiment of the present invention.

In the figure, 1-box body, 2-sealing ring, 21-second annular groove, 3-box cover, 41-first annular groove, 42-pressing part, 421-first annular protrusion, 51-bolt, 52-limit ring, 61-threaded flange, 62-stop washer, 63-sealing ring, 64-lock nut, 7-lead wire, 8-cable.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all 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.

1 is a perspective view of a protective box proposed by an embodiment of the present invention. The protective box includes a box body 1, a sealing ring 2 (not shown in FIG. 1 ) and a box cover 3; There is a through hole on the top, and the protective box is installed on the external device through the through hole;

2, the box cover 3 is provided with a pressing portion 42, the pressing portion 42 extends along the edge of the box cover 3 to form an annular structure, the inside of the box body 1 is provided with a first annular groove 41, and the box cover 3 is closed on the box body 1. After being installed, the pressing portion 42 is located in the first annular groove 41;

The side of the pressing portion 42 away from the box cover 3 is provided with a first annular protrusion 421 , the first annular protrusion 421 extends along the length direction of the pressing portion 42 to form an annular structure, and the pressing portion 42 is located in the first annular groove 41 . In the state, the first annular protrusion 421 is opposite to the bottom of the first annular groove 41, and the pressing portion 42 in FIG. 2 has not been fully fitted in place;

The sealing ring 2 is fitted in the first annular groove 41, and the depth of the first annular groove 41 is greater than the thickness of the sealing ring 2, so that the sealing ring 2 is completely surrounded to avoid the dislocation of the sealing ring 2, and the sealing ring 2 is matched in the first annular groove 41. After inside, there is still space in the first annular groove 41 for accommodating the pressing part 42, so as to avoid the sealing failure caused by the misalignment of the box body 1 and the box cover 3, and the sealing ring 2 is provided with two second Ring-shaped protrusion, a second ring-shaped groove 21 is formed between the two second ring-shaped protrusions, under the action of the pressing force, the two second protrusions surround the first ring-shaped protrusion 421, the sealing effect is better, and the compression The sealing surface formed between the part 42 and the sealing ring 2 is not a simple plane or arc surface, and it is more difficult for the rainwater outside the protective box to penetrate into the protective box;

After the box cover 3 is closed on the opening of the box body 1, the pressing portion 42 fits in the first annular groove 41 and abuts against the sealing ring 2, and the first annular protrusion 421 fits in the second annular groove 21;

The box cover 3 is provided with installation through holes for installing lead wires 7 and cables 8 to connect the devices in the protective box with the devices outside the protective box, specifically, including five installation through holes, four of which are installed through holes For installing lead wire 7, a mounting through hole in the middle is for cable 8 to pass through.

In another design, the first annular groove 41 can be arranged on the box cover 3, and the pressing portion 42 can be arranged at the opening position of the box body 1. Other designs are the same. The part 42 is fitted in the first annular groove 41, and the first annular protrusion 421 is fitted in the second annular groove 21, which can also achieve the same sealing effect.

In another design, referring to FIG. 3 , the number of second annular protrusions may exceed two, a plurality of second annular protrusions are arranged in parallel, and a second annular protrusion is formed between any adjacent second annular protrusions In the groove 21, adaptively, the pressing portion 42 is provided with a plurality of first annular protrusions 421, and each first annular protrusion 421 is located in a second annular groove 21. The sealing surface is more tortuous and the sealing effect is better.

In order to improve the sealing effect and reduce the materials used for the sealing ring 2, the sealing ring 2 in this embodiment is hollow inside, and the hollow section is circular. When it collapses inward, the second annular protrusion collapses to the side of the first annular protrusion 421 , so that the first annular protrusion 421 and the second annular protrusion cooperate more closely.

In this embodiment, when the pressing portion 42 is located in the first annular groove 41, the gap between the side wall of the pressing portion 42 and the side wall of the first annular groove 41 is as small as possible, so that the pressing portion 42 will not be in the first annular groove 41. The annular groove 41 is shaken and displaced, and when the box cover 3 is matched with the box body 1, the first annular protrusion 421 can just fit in the second annular groove 21 without displacement; and the sealing ring 2 is completely surrounded , Light and external sundries will not touch the sealing ring 2, and the sealing ring 2 will not age very quickly.

Specifically, the cross-section of the sealing ring 2 in this embodiment is a combination of a semicircle and a rectangle, and the diameter of the semicircle is equal to the long side of the rectangle. Suitably, the bottom of the first annular groove 41 is an arc surface, which is close to the sealing surface. The outer wall of the ring 2 fits seamlessly. In another design, the cross-section of the sealing ring 2 can also be in other shapes, such as a rectangle, a circle, etc.; the first annular protrusion 421 and the second annular protrusion are both triangular in cross section , the two second annular protrusions surround the first annular protrusion 421. The sizes of the first annular protrusion 421 and the second annular protrusion shown in FIG. 2 and FIG. 3 are only examples. and the second annular protrusion will not affect the tight fit between the pressing portion 42 and the sealing ring 2 at other positions; of course, the first annular protrusion 421 and the second annular protrusion can also be other shapes, such as rectangle, semicircle, etc. , no matter which shape it is, the first annular protrusion 421 and the second annular protrusion must be closely matched.

The box body 1 in this embodiment is roughly in the shape of a quadrangular pyramid. Since the protective box is located near the track and is affected by vibration for a long time, the box body 1 and the box cover 3 need to be connected reliably. In this embodiment, the box body 1 and the box cover are connected. 3. Connected by bolts, specifically including four bolts. The four bolts are located in the middle of the four sides of the box cover 3. Compared with the existing protective box with only two fastening points, the locks of the box body 1 and the box cover 3 The tightening effect is better, and the sealing effect can reach the IP67 level; in another design method, a plurality of buckles with springs can be used to lock the box cover 3 and the box body 1, and the maximum allowable tensile force of the selected buckles can reach 250kg, it is guaranteed to provide enough locking force, and the buckle is easy to operate, and can be loosened and locked without tools.

Using the bolt 51 connection method, the following designs can also be used:

4 , which is a partial schematic view of the sealing ring 2 , the sealing ring 2 is provided with two second annular grooves 21 , the sealing ring 2 is provided with a plurality of through holes, and the through holes are located between the first annular groove 41 and the second annular groove 21 During the time, the limit ring 52 is coaxially fitted in the through hole, the outer wall of the limit ring 52 is closely matched with the inner wall of the through hole, the limit ring 52 has high hardness and can be made of metal, plastic, etc. The axial length of the limit ring 52 less than the axial length of the through hole;

The bolt 51 passes through the limit ring 52. When the bolt 51 is tightened, the box cover 3 and the box body 1 gradually press the sealing ring 2, and the distance between the nut and the limit ring 52 gradually decreases. When abutting, the bolt 51 cannot continue to be twisted. It can be seen that the limit ring 52 is used to limit the rotation of the bolt 51 to prevent the sealing ring 2 from being damaged due to excessive pressure. In addition, the cross section of the sealing ring 2 shown in FIG. In the middle sealing ring, the section of the sealing ring 2 shown in Figure 2 and Figure 3 is different, and both sections are allowed.

5, it is a sectional view of the protective box, as can be seen from the figure, the cross-sectional area of the box body 1 perpendicular to the depth direction gradually increases from the inside to the outside, and a step is formed in the middle position of the box body 1, and the outer position of the box body 1 opening is set. There is a circle of connecting parts, and the first annular groove 41 and the threaded holes for installing the bolts are opened on the connecting parts. The specific design of the threaded holes is to open a through hole on the connecting part. A hole section, a second hole section and a third hole section, the diameters of the first hole section and the third hole section are larger than the diameter of the second hole section, the inner wall of the second hole section is provided with threads for matching with the bolts, the first hole section The hole segment is used to accommodate the nut.

The four installation through holes for installing the lead wires 7 are arranged in two groups, and the two sets of installation through holes are respectively close to the two short sides of the box cover 3 , and the installation through holes for the cables 8 to pass through are located in the middle of the box cover 3 .

The lead wire holes and cable wire holes of the existing protective box have no sealing measures, and need to be sealed with glue on site, which has poor operability and poor sealing performance. In order to facilitate the operation and improve the sealing performance, the lead wire 7 and the cable 8 are installed on the installation through holes through the installation joint, which is also called the cable joint. Specifically, referring to FIG. 6 , the installation joint includes a threaded flange 61, a stop washer 62, a sealing ring 63 and a lock nut 64;

One end of the threaded flange 61 is fixed in the installation through hole. Specifically, the threaded flange 61 includes a first connecting portion and a second connecting portion. The outer wall of the first connecting portion is provided with an annular groove in the circumferential direction. In the through hole, the inner wall of the installation through hole is provided with a ring of annular protrusions, and the annular protrusion fits into the annular groove of the first connecting part, so as to lock and fix the first connecting part in the installation through hole, and the second connecting part is On the outside of the box cover, the outer peripheral wall of the second connecting part is provided with threads;

An annular groove is formed between the first connection part and the second connection part, and the stop washer 62 is fitted in the annular groove, and the stop washer 62 cannot rotate around the threaded flange 61;

The locking nut 64 includes a third connecting part and a clamping part in the axial direction, the inner wall of the third connecting part is provided with threads, the third connecting part cooperates with the second connecting part, and the end of the clamping part away from the third connecting part is provided with a limit The accommodating space is formed in the limiting part and the clamping part for accommodating the sealing ring 63;

The lead wire 7 in this embodiment is a copper tube. The copper tube includes a flattening portion, a thick tube section and a thin tube section from the first end to the second end. The flattening portion is formed by flattening the first end of the copper tube, and There is a connecting hole in the flattening part, the diameter of the thick pipe section is larger than the diameter of the thin pipe section, a step surface is formed between the thick pipe section and the thin pipe section, and the thin pipe section is used to cooperate with the installation joint. On the inside of 3, the second end of the copper pipe is located on the outside of the box cover 3, and the thick pipe section cannot be matched with the installation joint due to its too large diameter;

When installing the lead wire 7, first insert the thin pipe section of the lead wire 7 into the threaded flange 61, the first end of the lead wire 7 is located inside the box cover 3, and the second end is located outside the box cover 3, and then the sealing ring 63 is placed on the cover. The lead wire 7 on the outside of the box cover 3 abuts against the second connecting portion, and then the locking nut 64 is matched with the threaded flange 61. The sealing ring 63 is located in the accommodating space and abuts against the limiting portion. The sealing ring 63 is limited in the accommodating space. During the tightening process of the locking nut 64, the sealing ring 63 is pressed radially and axially, and the sealing ring 63 tightly seals the locking nut 64 and the lead wire 7 to achieve To achieve the sealing effect, finally bend the stop washer 62 against the lock nut to limit the rotation of the lock nut 64 to prevent loosening; similarly, if the cable 8 is installed on the box cover 3 through the installation joint, first The locking nut 64 and the sealing ring 63 are sleeved on the cable 8, and then the cable 8 is inserted into the threaded flange 61. The end of the cable 8 is located inside the box cover 3, and the locking nut 64 is matched with the threaded flange 61. Lock In the process of tightening the nut 64, the sealing ring 63 is under pressure, and the sealing ring 63 seals the locking nut 64 and the cable 8 tightly, and finally the stop washer 62 is bent to limit the rotation of the locking nut 64, which plays a role in preventing loosening. .

The installation through hole for the cable 8 to pass through may need to install multiple cables 8 at the same time according to the specific situation. According to the on-site usage, the use of the cable 8 can be divided into the following four situations:

A SPTYWA23-8-core cable 8;

One SPTYWA23-8 core cable 8+one 50mm ² copper wire;

One SPTYWA23-12 core cable 8;

One SPTYWA23-12 core cable 8+one 50mm ² copper wire;

Therefore, in order to ensure the sealing performance of the two cables 8, in this embodiment, two kinds of sealing rings 63 are designed. One kind of sealing ring 63 is provided with one through hole for the cables 8 to pass through, and the other is provided with two through holes for the cables 8 to pass through. Through holes, as shown in FIG. 7 , two through holes respectively accommodate cables 8 with different diameters.

The protective box is used to accommodate the information tuning and matching unit PTX or the air-core coil XKD. Both the information tuning and matching unit and the air-core coil are connected to the lead wire 7, and the information tuning and matching unit is connected to the four lead wires 7. The air-core coil It is only connected with two lead wires 7. Due to the different structures of the information tuning and matching unit and the hollow coil, the position of the end of the lead wire 7 can only meet the installation of one of the devices. When installing the other device, the lead wire 7 needs to be bent. In order to make the end of the lead wire 7 reach a proper position, the lead wire 7 needs to be bent more conveniently. Referring to Fig. 8, in the prior art, the periphery of the installation through hole is a plane, and the length of the lead wire 7 located on the inside of the box cover 3 is relatively short. According to the lever principle, it is more laborious to bend. , the periphery of the installation through hole is recessed to the outside of the box cover 3 to form a groove, and the two lead wires 7 are in the same groove, so that the length of the lead wire 7 on the inside of the box cover 3 is extended. According to the lever principle, the lead wire 7 bends The force required for folding is reduced. Comparing Figures 8 and 9, the end of the lead wire 7 is moved by the same distance L, the bending angle of the lead wire 7 in Figure 9 is smaller, and the excessive bending angle of the lead wire 7 is also avoided. If it is too large, the lead wire 7 is broken.

Similarly, a groove is formed around the installation through hole for installing the cable 8 to the outside of the box cover 3 , which is also for the convenience of bending the end of the cable 8 .

In the prior art, there is also no groove but by increasing the length of the lead wire 7 in the box body 1 to facilitate the bending of the lead wire 7, but due to the change in the position of the end of the lead wire 7, the depth of the box body 1 also needs to be Adaptation changes, production costs increase.

Because the protective box is outdoors and exposed to sunlight for a long time, the outer side of the box body 1 and the outer side of the box cover 3 are coated with an ultraviolet absorber. The main components of the absorber are benzophenone and ethylhexyl salicylate, which can absorb harmful ultraviolet rays. , reduce the damage caused by ultraviolet rays and improve the service life of the protective box.

Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements to some of the technical features; and these Modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (7)

1. A protective box for a track circuit, characterized in that it comprises a box body (1), a sealing ring (2) and a box cover (3); The opening of the box body (1) is provided with a first annular groove (41), the inner side of the box cover (3) is provided with a pressing portion (42), or the opening of the box body (1) is provided with a pressing portion (42), and the box cover ( 3) The inner side is provided with a first annular groove (41); The pressing portion (42) is provided with a first annular protrusion (421); The sealing ring (2) is fitted in the first annular groove (41), the sealing ring (2) is provided with at least two second annular protrusions along the length direction, and a second annular groove is formed between any adjacent second annular protrusions (twenty one); The box cover (3) is closed on the opening of the box body (1), the pressing part (42) is fitted in the first annular groove (41), and the first annular protrusion (421) is fitted in the second annular groove (21) Inside; The box cover (3) is provided with an installation through hole. 2. The protective box for a track circuit according to claim 1, characterized in that the sealing ring (2) is hollow inside. 3. The protective box for a track circuit according to claim 1, characterized in that, further comprising a bolt (51) and a limit ring (52); The sealing ring (2) is provided with a through hole, the limit ring (52) is coaxially fitted in the through hole, and the axial length of the limit ring (52) is smaller than the axial length of the through hole; The box body (1) and the box cover (3) are connected by bolts (51), and the middle part of the bolts (51) is located in the limit ring (52). 4 . The protective box for a track circuit according to claim 1 , wherein a groove is formed around the mounting through hole to the outside of the box cover ( 3 ). 5 . 5. The protective box for a track circuit according to any one of claims 1-4, characterized in that it further comprises a mounting joint, wherein the mounting joint comprises a threaded flange (61), a stop washer (62), a sealing ring ( 63) and lock nut (64); The threaded flange (61) is coaxially fixed in the installation through hole, the stop washer (62) is fitted on the threaded flange (61), the locking nut (64) is fitted with the threaded flange (61), and the sealing ring (63) ) is located in the accommodating cavity formed by the locking nut (64) and the threaded flange (61), and the sealing ring (63) abuts against the locking nut (64) and the threaded flange (61). 6 . The protective box for a track circuit according to claim 5 , wherein the sealing ring ( 63 ) is provided with a plurality of through holes, and the axes of the plurality of through holes are parallel to the axis of the sealing ring ( 63 ). 7 . 7. The protective box for a track circuit according to any one of claims 1-4 and 6, characterized in that the outer side of the box body (1) and the outer side of the box cover (3) are coated with an ultraviolet absorber.

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