A three-way turnout rail connecting iron

Abstract

The utility model discloses a three-way turnout point rail connecting iron, belonging to the technical field of turnout. It includes a V-shaped connecting iron and a Z-shaped connecting iron, the V-shaped connecting iron and the Z-shaped connecting iron include a point rail connecting part and a rod connecting part; the point rail connecting part is provided with a first connecting hole; the end of the rod connecting part is provided with a joint plate; for the V-shaped connecting iron, the point rail connecting part is arranged along the direction where the lateral point rail is located, and the rod connecting part is bent inwardly relative to the point rail connecting part to form a V shape; for the Z-shaped connecting iron, the point rail connecting part and the rod connecting part are both arranged along the direction where the lateral point rail is located and a bending part is provided therebetween, the bending part is bent inwardly from the point rail connecting part to the rod connecting part, an enlarged part is provided on the rod connecting part, a through hole is provided on the enlarged part for the second pull rod to pass through and act, the through hole is aligned with the joint plate of the V-shaped connecting iron and an insulating sleeve is provided thereon. It is intersected with the pull rod in a non-bending manner, and will not interfere with the connecting iron and the fixing bolts thereon.

Description

Technical Field

[0001] The utility model belongs to the technical field of turnouts, and particularly relates to a three-way turnout point rail connecting iron, which is specially designed for a three-way turnout and is used for connecting with a lateral point rail. Background Art

[0002] A turnout is a basic connection device for railway tracks. The turnouts listed in the Ministry of Railways' "Main Parameters Manual of Commonly Used Turnouts" are divided into single-opening turnouts, symmetrical turnouts, compound cross-over turnouts, and cross-over turnouts. A three-opening turnout refers to a turnout that leads from one direction to three directions. A three-opening turnout is a special type of turnout. It is used when there are many lines that need to be connected and the terrain is restricted, and two single-opening turnouts cannot be laid continuously on the main line. It is usually laid in marshalling yards, freight yards, and locomotive depots. The two-way running rails of the currently used three-opening turnouts are symmetrically distributed relative to the center line of the straight running rails, so they are also called symmetrical three-opening turnouts. A symmetrical three-way turnout generally includes a pair of basic rails, a pair of lateral point rails and a pair of straight point rails, etc. A first tie rod (driven by a switch) is provided between a lateral point rail and a straight point rail, a second tie rod (driven by another switch) is provided between another lateral point rail and another straight point rail, and the first tie rod and the second tie rod are arranged side by side in the direction where the basic rails are located. In the prior art, one end of the tie rod is fixedly connected to the straight point rail through a joint iron, and the other end thereof is hinged to the lateral point rail through a connecting iron.

[0003] For example, the patent with application number CN201220630777.2 discloses a pointed rail connecting iron, including a pointed rail connecting part, a rod connecting part and a trapezoidal section connecting the pointed rail connecting part and the rod connecting part and placed between the pointed rail connecting part and the rod connecting part, wherein a joint bearing is arranged at the top end of the rod connecting part; a connecting hole is arranged on the pointed rail connecting part, and the surfaces of the pointed rail connecting part, the connecting hole and the trapezoidal section are all provided with an insulating layer.

[0004] For a three-way turnout, two tie rods need to be set, one of which needs to intersect with a connecting iron (in the prior art, the connecting iron is usually bent upward or downward to form a U shape to avoid the tie rod), and the connecting iron may also interfere with the joint iron at the end of the tie rod. Utility Model Content

[0005] In order to solve the above problems, the embodiment of the utility model provides a three-way turnout point rail connecting iron, which is specially designed for the three-way turnout, crosses the pull rod in a non-bending manner, and will not interfere with the connecting iron and the fixing bolts thereon. The technical solution is as follows:

[0006] On the one hand, the embodiment of the utility model provides a three-opening turnout point rail connecting iron, including a V-shaped connecting iron 1 and a Z-shaped connecting iron 2, the V-shaped connecting iron 1 and the Z-shaped connecting iron 2 are respectively arranged at the ends of two lateral point rails 13 and both include a point rail connecting part 3 and a rod connecting part 4; the point rail connecting part 3 is provided with a first connecting hole 5 in the horizontal direction, and its bottom and outer side are matched with the inner side of the lateral point rail 13; the end of the rod connecting part 4 is provided with a joint plate 6, the joint plate 6 is horizontally arranged and a second connecting hole 7 is provided on it in the vertical direction; for the V-shaped connecting iron 1, the point rail connecting part 3 is arranged along the direction where the lateral point rail 13 is located, and the rod connecting part The connecting portion 4 is bent inwardly relative to the point rail connecting portion 3 to form a V shape and the angle between it and the point rail connecting portion 3 is an obtuse angle; for the Z-shaped connecting iron 2, the point rail connecting portion 3 and the rod connecting portion 4 are both arranged along the direction of the lateral point rail 13 and a bending portion 11 is provided therebetween, the bending portion 11 is bent inwardly from the point rail connecting portion 3 to the rod connecting portion 4, an enlarged portion 8 is provided on the rod connecting portion 4, the upper and lower sides of the enlarged portion 8 extend upward and downward respectively relative to the corresponding sides of the rod connecting portion 4 and a through hole 9 is provided thereon for the second pull rod 16 to pass through and move, the through hole 9 is aligned with the joint plate 6 of the V-shaped connecting iron 1 and an insulating sleeve 10 is provided thereon.

[0007] The through hole 9 in the embodiment of the utility model is a rectangular hole arranged along the direction of the rod connecting portion 4 , which is perpendicular to the rod connecting portion 4 , and has gaps between its four sides and the corresponding sides of the second pull rod 16 .

[0008] The insulating sleeve 10 in the embodiment of the utility model is a rectangular sleeve, which is surrounded by four insulating plates; the insulating plates are glued to the corresponding sides of the through holes 9, which are rectangular polyamide sheets.

[0009] Specifically, three first connection holes 5 are provided on the point rail connection part 3 in the embodiment of the utility model. The three first connection holes 5 are arranged side by side in the direction where the point rail connection part 3 is located and are all perpendicular to the point rail connection part 3 .

[0010] Among them, the upper and lower sides of the rod connecting part 4 of the V-shaped connecting iron 1 in the embodiment of the utility model are both inclined surfaces and they gradually approach from the point rail connecting part 3 to the joint plate 6.

[0011] The enlarged portion 8 in the embodiment of the utility model is a rectangular block arranged along the direction of the rod connecting portion 4 , which is located at one end of the rod connecting portion 4 close to the joint plate 6 ; the through hole 9 is arranged away from the joint plate 6 .

[0012] Specifically, the through hole 9 , the connector plate 6 and the rod connecting portion 4 in the embodiment of the utility model are all located on the midline of the enlarged portion 8 , and the connector plate 6 is disposed at the middle of the end of the enlarged portion 8 .

[0013] Specifically, in the embodiment of the utility model, for the V-shaped connecting iron 1, the angle between the point rail connecting part 3 and the rod connecting part 4 is 155-175°; for the Z-shaped connecting iron 2, the angle between the bending part 11 and the point rail connecting part 3 is 120-160°, and the horizontal distance between the point rail connecting part 3 and the rod connecting part 4 is 30-70mm.

[0014] On the other hand, the embodiment of the utility model further provides a three-way turnout, including a pair of basic rails 12, a pair of lateral point rails 13 and a pair of straight point rails 14, a first tie rod 15 is provided between one lateral point rail 13 and one straight point rail 14, a second tie rod 16 is provided between another lateral point rail 13 and another straight point rail 14, the first tie rod 15 and the second tie rod 16 are arranged side by side in the direction where the basic rail 12 is located, and the second tie rod 16 is a rectangular rod; one end of the first tie rod 15 is connected to a straight point rail connection 14 through a first joint iron 17, and the other end thereof is connected to the lateral point rail 13 on the opposite side through a Z-shaped connecting iron 2; the second tie rod 16 is located upstream of the first tie rod 15, and passes through the through hole 9, and the second tie rod 16 is provided between the first tie rod 15 and the straight point rail 14. One end is connected to another straight point rail 14 through a second joint iron 18, and the other end is connected to the lateral point rail 13 on the opposite side through a V-shaped connecting iron 1; the point rail connecting parts 3 of the V-shaped connecting iron 1 and the Z-shaped connecting iron 2 are respectively fixed to the inner sides of the ends of the two lateral point rails 13 through first bolts 19 passing through the first connecting holes 5, the first joint iron 17 and the second joint iron 18 are respectively fixed to the inner sides of the two straight point rails 14 through second bolts 20, the rod connecting part 4 of the Z-shaped connecting iron 2 is located on the inner side of the second bolt 20 on the corresponding side and its joint plate 6 is hinged to the first pull rod 15, and the rod connecting part 4 of the V-shaped connecting iron 1 is located on the inner side of the second bolt 20 on the corresponding side and its joint plate 6 is hinged to the second pull rod 16.

[0015] Furthermore, an adjustment sheet 21 and an insulating sheet 22 are sequentially provided from the outside to the inside between the point rail connecting portion 3 of the V-shaped connecting iron 1 and the Z-shaped connecting iron 2 in the embodiment of the utility model and the lateral point rail 13 on the corresponding side, and the adjustment sheet 21 and the insulating sheet 22 are both arc-shaped sheets that cooperate with the inner side of the lateral point rail 13 and are provided with a hole for the first bolt 19 to pass through.

[0016] The beneficial effects of the technical solution provided by the embodiment of the utility model are as follows: the embodiment of the utility model provides a three-way turnout point rail connecting iron, which is specially designed for three-way turnouts, and crosses with the pull rod in a non-bending manner (by setting an enlarged part and punching a hole), and avoids interference with the connecting iron and the fixing bolts thereon by bending inward or translating inward. The Z-shaped connecting iron of this patent also has the following advantages: 1. High strength (no need to bend, which can avoid cracks when bending); 2. Reduce the entry of debris (bending method, the upper or lower side is open, and debris is easy to enter); 3. It is convenient to set up the insulating sleeve and ensure the stability of the insulating sleeve. The four insulating plates are against each other, which is not only convenient for setting, but also more solid; 4. Ensure the stability of the second pull rod and avoid the second pull rod from swinging up and down. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the Z-shaped connecting iron;

[0018] Figure 2 It is a side view of the Z-shaped connecting iron;

[0019] Figure 3 It is a schematic diagram of the structure of the V-shaped connecting iron;

[0020] Figure 4 It is a side view of the V-shaped connecting iron;

[0021] Figure 5 yes Figure 1 Cross-sectional view along the BB direction;

[0022] Figure 6 yes Figure 3 Cross-sectional view along the DD direction;

[0023] Figure 7 It is a schematic diagram of the structure of a three-way turnout;

[0024] Figure 8 yes Figure 7 Partial cross-sectional view along CC direction.

[0025] In the figure: 1 V-shaped connecting iron, 2 Z-shaped connecting iron, 3 point rail connecting part, 4 rod connecting part, 5 first connecting hole, 6 joint plate, 7 second connecting hole, 8 expansion part, 9 through hole, 10 insulating sleeve, 11 bending part, 12 basic rail, 13 lateral point rail, 14 straight point rail, 15 first pull rod, 16 second pull rod, 17 first joint iron, 18 second joint iron, 19 first bolt, 20 second bolt, 21 adjustment sheet, 22 insulating sheet. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings.

[0027] Example 1

[0028] See also Figure 1-6 Embodiment 1 provides a three-way turnout point rail connector, including a V-shaped connector 1 and a Z-shaped connector 2. The V-shaped connector 1 and the Z-shaped connector 2 are respectively arranged at the ends of the two lateral point rails 13, and both include a point rail connection part 3 and a rod connection part 4, which are respectively hinged to two pull rods. A plurality of first connection holes 5 are provided on the point rail connection part 3 in the horizontal direction (a plurality of first connection holes 5 are arranged side by side in the direction where the point rail connection part 3 is located and they are all perpendicular to the point rail connection part 3), and the bottom and the outer side thereof cooperate with the inner side of the lateral point rail 13 (specifically an arc-shaped structure). A joint plate 6 is provided at the end of the rod connection part 4. The joint plate 6 is arranged horizontally, and a second connection hole 7 is provided on it in the vertical direction. The end thereof is arc-shaped, and its thickness is smaller than that of the rod connection part 4, and it cooperates with the pull rod. Both the V-shaped connector 1 and the Z-shaped connector 2 are integrally formed by a machining center to ensure strength.

[0029] For the V-shaped connecting iron 1: the point rail connecting part 3 is arranged along the direction of the lateral point rail 13. The rod connecting part 4 is bent inwardly relative to the point rail connecting part 3 to form a V shape, and the angle between it and the point rail connecting part 3 is an obtuse angle (specifically, the angle between the point rail connecting part 3 and the rod connecting part 4 is 155-175°), and its upper and lower sides are both inclined surfaces, which gradually approach from the point rail connecting part 3 to the joint plate 6 until they are flush with the joint plate 6. The rod connecting part 4 is bent inwardly to avoid the first joint iron 17 and the second bolt 20 on the corresponding side (while facilitating the operation of the second bolt 20).

[0030] For the Z-shaped connecting iron 2: the point rail connecting part 3 and the rod connecting part 4 are both arranged along the direction where the lateral point rail 13 is located, and a bending part 11 is arranged between them. The bending part 11 is bent inward from the point rail connecting part 3 to the rod connecting part 4, and the angle between it and the point rail connecting part 3 is an obtuse angle (specifically, the angle between the bending part 11 and the point rail connecting part 3 is 120-160°). The rod connecting part 4 is translated inward relative to the point rail connecting part 3 (the horizontal distance between the point rail connecting part 3 and the rod connecting part 4 is 30-70mm) to avoid the second joint iron 18 and the second bolt 20 (while facilitating the operation of the second bolt 20), and an enlarged part 8 is arranged thereon to facilitate the arrangement of a through hole 9. The upper and lower sides of the enlarged part 8 extend upward and downward respectively relative to the corresponding sides of the rod connecting part 4, and a through hole 9 is arranged thereon for the second pull rod 16 to pass through and act. The through hole 9 is aligned with the joint plate 6 of the V-shaped connecting iron 1 and an insulating sleeve 10 is arranged thereon to play an insulating role. Specifically, the second tie rod 16 is a rectangular rod; accordingly, the through hole 9 is a rectangular hole arranged along the direction of the rod connecting portion 4, which is sleeved outside the second tie rod 16, and is perpendicular to the rod connecting portion 4, and there are gaps between its four sides and the corresponding sides of the second tie rod 16. Correspondingly, the insulating sleeve 10 is a rectangular sleeve, which is surrounded by four insulating plates. The insulating plates are glued to the corresponding sides of the through hole 9, which are rectangular polyamide sheets (specifically made of polyamide 66), which are tightly matched with the through hole 9.

[0031] The enlarged portion 8 in the embodiment of the utility model is a rectangular block arranged along the direction of the rod connecting portion 4, which is located at one end of the rod connecting portion 4 close to the joint plate 6, and occupies most of the rod connecting portion 4. The through hole 9 is arranged away from the joint plate 6. The through hole 9, the joint plate 6 and the rod connecting portion 4 are all located on the center line of the enlarged portion 8, and the joint plate 6 is arranged at the middle of the end of the enlarged portion 8.

[0032] Example 2

[0033] See also Figure 1-6 Example 2 provides a three-opening turnout point rail connecting iron, whose structure is basically the same as that of Example 1, except that: the number of first connecting holes 5 in this embodiment is three, and the three first connecting holes 5 are arranged side by side in the direction where the point rail connecting part 3 is located.

[0034] Example 3

[0035] Embodiment 3 provides a three-way turnout point rail connector, and its structure is basically the same as that of Embodiment 1, except that: the V-shaped connector 1 and the Z-shaped connector 2 in this embodiment are both arranged in the front-to-back direction and are respectively arranged on the right side point rail 13 and the left side point rail 13. For the Z-shaped connector 2, the bending portion 11 is bent to the right from front to back, the rod connecting portion 4 is located on the right side of the point rail connecting portion 3, the rod connecting portion 4 and the point rail connecting portion 3 are both arranged in the front-to-back direction, the through hole 9 is arranged in the left-to-right direction, the enlarged portion 8 is located at the rear end of the rod connecting portion 4 and its left and right sides are flush with the left and right sides of the rod connecting portion 4. For the V-shaped connector 1, the rod connecting portion 4 is bent to the left from front to back.

[0036] Example 4

[0037] Embodiment 4 provides a three-way turnout point rail connector, the structure of which is basically the same as that of Embodiment 1, except that: in this embodiment, for the V-shaped connector 1: the angle between the point rail connection portion 3 and the rod connection portion 4 is 164°. For the Z-shaped connector 2: the angle between the bending portion 11 and the point rail connection portion 3 is 144°, and the horizontal distance between the point rail connection portion 3 and the rod connection portion 4 (specifically, the distance between the outer sides) is 40 mm.

[0038] Example 5

[0039] See also Figure 7-8 Embodiment 5 provides a three-way turnout, including a pair of basic rails 12, a pair of lateral point rails 13 and a pair of straight point rails 14; specifically, the basic rails 12, the lateral point rails 13 and the straight point rails 14 are all arranged in the front-to-back direction; the straight point rail 14 is located on the inner side of the basic rail 12 on the corresponding side, and extends backward relative to the lateral point rail 13. The lateral point rail 13 is located on the inner side of the straight point rail 14 on the corresponding side. A first pull rod 15 (driven by the corresponding switch) is provided between one lateral point rail 13 and one straight point rail 14, and a second pull rod 16 (driven by the corresponding switch) is provided between another lateral point rail 13 and another straight point rail 14. The first pull rod 15 and the second pull rod 16 are arranged side by side in the direction where the basic rail 12 is located (specifically, arranged side by side in the front-to-back direction). The first pull rod 15 and the second pull rod 16 are rectangular rods, which are specifically arranged in the left-right direction. The above structure is basically the same as the structure of the existing three-way turnout, except that:

[0040] In this embodiment, one end (specifically the right end) of the first tie rod 15 is connected to a straight point rail connection 14 (specifically the straight point rail connection 14 on the right) through a first joint iron 17, and the other end (specifically the left end) is connected to the lateral point rail 13 on the opposite side (specifically the opposite side of a straight point rail connection 14, which is the lateral point rail 13 on the left) through a Z-shaped joint iron 2. The second tie rod 16 is located upstream (specifically in front) of the first tie rod 15, passes through the through hole 9, and one end (specifically the left end) is connected to another straight point rail 14 (specifically the straight point rail 14 on the left) through a second joint iron 18, and the other end (specifically the right end) is connected to the lateral point rail 13 on the opposite side (specifically the opposite side of another straight point rail 14, which is the lateral point rail 13 on the right) through a V-shaped joint iron 1. The point rail connection parts 3 of the V-shaped connecting iron 1 and the Z-shaped connecting iron 2 are respectively fixed to the inner side of the ends of the two lateral point rails 13 by the first bolts 19 (horizontally arranged, which can be specifically M20*150 specifications) passing through the first connecting hole 5. The first joint iron 17 and the second joint iron 18 are both T-shaped structures, which are existing structures, and are respectively fixed to the inner side of the two straight point rails 14 by the second bolts 20. Specifically, the second joint iron 18 is fixed to the rear part of the straight point rail 14 on the left side, and the first joint iron 17 is fixed to the rear end of the straight point rail 14 on the right side and is located behind the second joint iron 18. The rod connection part 4 of the Z-shaped connecting iron 2 is located on the inner side of the second bolt 20 on the corresponding side, and its joint plate 6 is hinged to the first pull rod 15, which extends backward relative to the V-shaped connecting iron 1. The rod connection part 4 of the V-shaped connecting iron 1 is located on the inner side of the second bolt 20 on the corresponding side and its joint plate 6 is hinged to the second pull rod 16.

[0041] Furthermore, in the embodiment of the present invention, the V-shaped connecting iron 1 and the Z-shaped connecting iron 2 are provided with an adjustment sheet 21 and an insulating sheet 22 from the outside to the inside between the point rail connection portion 3 and the corresponding side point rail 13. The structure of the adjustment sheet 21 and the insulating sheet 22 is similar to the existing structure, and the detailed description is omitted in this embodiment. The adjustment sheet 21 and the insulating sheet 22 are both arc-shaped sheets that match the inner side of the lateral point rail 13 and are provided with holes (specifically three) for the first bolt 19 to pass through.

[0042] Example 6

[0043] See also Figure 7-8 Embodiment 6 provides a three-way turnout, and its structure is basically the same as that of Embodiment 5, except that: in this embodiment, the transverse arm (set in the left-right direction) of the second joint iron 18 is longer, and the longitudinal arm (set in the front-back direction) of the second joint iron 18 is fixed to the rear of the left straight point rail 14 by the second bolt 20. The transverse arm is arranged in the middle of the inner side of the longitudinal arm, and after passing through the through hole 9 inward, it is hinged to the left end of the second pull rod 16 (shorter, located on the right side of the Z-shaped connecting iron 2). Then the through hole 9 should be able to allow the transverse arm to pass through and move.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A three-way turnout point rail connecting iron, characterized in that: The invention comprises a V-shaped connecting iron (1) and a Z-shaped connecting iron (2), wherein the V-shaped connecting iron (1) and the Z-shaped connecting iron (2) are respectively arranged at the ends of two lateral point rails (13) and each comprises a point rail connecting portion (3) and a rod connecting portion (4); a first connecting hole (5) is arranged on the point rail connecting portion (3) in a horizontal direction, and the bottom and the outer side thereof cooperate with the inner side of the lateral point rail (13); a joint plate (6) is arranged at the end of the rod connecting portion (4), and the joint plate (6) is arranged horizontally and a second connecting hole (7) is arranged on the joint plate in a vertical direction; For the V-shaped connecting iron (1), the pointed rail connecting portion (3) is arranged along the direction where the lateral pointed rail (13) is located, and the rod connecting portion (4) is bent inwardly relative to the pointed rail connecting portion (3) to form a V shape, and the angle between the rod connecting portion (4) and the pointed rail connecting portion (3) is an obtuse angle; For the Z-shaped connecting iron (2), the pointed rail connecting part (3) and the rod connecting part (4) are both arranged along the direction of the lateral pointed rail (13) and a bending part (11) is arranged therebetween. The bending part (11) is bent inward from the pointed rail connecting part (3) to the rod connecting part (4). An enlarged part (8) is arranged on the rod connecting part (4). The upper and lower sides of the enlarged part (8) extend upward and downward respectively relative to the corresponding sides of the rod connecting part (4) and a through hole (9) is arranged thereon for the second pull rod (16) to pass through and move. The through hole (9) is aligned with the joint plate (6) of the V-shaped connecting iron (1) and an insulating sleeve (10) is arranged thereon.

2. The three-way turnout point rail connector according to claim 1, characterized in that: The through hole (9) is a rectangular hole arranged along the direction of the rod connecting portion (4), is perpendicular to the rod connecting portion (4), and has gaps between its four sides and the corresponding sides of the second pull rod (16).

3. The three-way turnout point rail connector according to claim 2, characterized in that: The insulating sleeve (10) is a rectangular sleeve, which is surrounded by four insulating plates; the insulating plates are glued to the corresponding sides of the through holes (9) and are rectangular polyamide sheets.

4. The three-way turnout point rail connector according to claim 1, characterized in that: The pointed rail connecting portion (3) is provided with three first connecting holes (5), the three first connecting holes (5) are arranged side by side in the direction where the pointed rail connecting portion (3) is located and are all perpendicular to the pointed rail connecting portion (3).

5. The three-way turnout point rail connector according to claim 1, characterized in that: The upper and lower sides of the rod connection part (4) of the V-shaped connecting iron (1) are both inclined surfaces and gradually approach each other from the point rail connection part (3) to the joint plate (6).

6. The three-way turnout point rail connector according to claim 1, characterized in that: The enlarged portion (8) is a rectangular block arranged along the direction of the rod connecting portion (4), and is located at one end of the rod connecting portion (4) close to the joint plate (6); the through hole (9) is arranged away from the joint plate (6).

7. The three-way turnout point rail connector according to claim 1, characterized in that: The through hole (9), the joint plate (6) and the rod connecting portion (4) are all located on the midline of the enlarged portion (8), and the joint plate (6) is arranged at the middle of the end of the enlarged portion (8).

8. The three-way turnout point rail connector according to claim 1, characterized in that: For the V-shaped connecting iron (1), the angle between the pointed rail connecting portion (3) and the rod connecting portion (4) is 155-175°; For the Z-shaped connecting iron (2), the angle between the bent portion (11) and the pointed rail connecting portion (3) is 120-160°, and the horizontal distance between the pointed rail connecting portion (3) and the rod connecting portion (4) is 30-70 mm.

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