An integrated redundant contact group for railway switch machine

Abstract

The invention relates to an integrated redundant contact group for a railway switch machine, comprising a static point combination, a moving point combination and a moving contact linear motion mechanism, etc.; three units, two static contact groups and one moving contact group, which are traditionally used in a dispersed manner, are designed to be a new integrated contact unit; the contact switch combination maintains the traditional left and right unit structure, but the plates and rings of the traditional contact group are rotated 90 degrees from the vertical direction to the horizontal direction, and are designed as upper and lower spring plates with the same potential and a moving point wheel at both ends, and a group of contact points are added to form an electrical contact redundant structure, and the upper plate or lower plate on any side can be connected to any upper and lower contact plate on the other side through the moving contact for electrical conduction; three paths are maintained on the left and right, and the moving point combination is the same, and the traditional three moving point rings are changed to six roller contacts, and a new moving point linear reciprocating motion mechanism is adopted to form an either-or electrical interlocking relationship, and the middle position is not in contact, so that an equivalent interlocking relationship is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of railway turnout switch machines, and in particular relates to an integrated redundant contact group for railway switch machines. Background Art

[0002] Data shows that Xi'an Railway Station has only 5 platforms and 9 passenger lines, while Xi'an North Railway Station has 18 platforms and 34 train lines, but the entry and exit lines are two lines, which requires nearly 10 times the number of power switch machines for turnout conversion, which puts higher requirements on the conversion equipment, requiring trouble-free, maintenance-free, stable and reliable switch machines and contact groups. The contact group is one of the most important electrical components of the switch machine, and its reliable and stable electrical contact performance when connected is particularly important. The urban underground railway system uses the same railway switch equipment, and its frequency of use is even higher than that of high-speed railways.

[0003] Since 2015, high-speed railway has entered a new journey, with advanced scale and strengthened management, and higher requirements for equipment. The original contact products are no longer suitable for high-speed railway transportation production, and zero failure and maintenance-free requirements have been put forward. The existing contacts cannot overcome the design defects. Although great efforts have been made in materials, production and processing, and quality control, various failures still occur, resulting in missing or errors in representation, affecting the time of train entry and exit, reducing railway transportation efficiency, and causing huge losses in railway transportation. The contact group products currently used have a simple structure, an open and dispersed structure, and the dynamic contacts and static contacts are installed and used in combination. According to statistics, the common faults are the fall-out of the retaining ring, the breakage of the cotter pin, point contact, poor contact, the contact piece is biased to one side, short circuit, contact piece contamination, low insulation resistance, low electrical life, etc. These faults are difficult to completely eliminate, and the root cause lies in the design. According to relevant technical standards, in TB / 1477-2005 "ZD6 Series Electric Switch Machine", the 4.18 switch machine has a reliable service life of 300,000 times. In order to adapt to high-speed rail operation, the new national standard GB / T 25338[1].1-2010 was implemented in March 2011. In 5.10.1, the number of operations of the switch machine test life is divided into two levels: 300,000 times and 1 million times, and the 1 million times level is added. According to statistical data, the existing contacts cannot complete 1 million times of normal on-site use. The equipment has been running with defects for a long time. The maintenance task of the electrical department is very large, and rescue repairs are often carried out, which costs a lot of manpower and financial resources. The most harmful thing is that it affects the normal operation of the train. The reason is that although the contacts are installed inside the switch machine, the switch machine equipment is an outdoor equipment after all. It is subject to high temperature, high humidity, severe cold coastal climate conditions and air pollution, which naturally causes the contact surface to deteriorate, the contact resistance to increase, and the insulation to decrease. In addition, unintentional damage caused by human beings cannot be completely eliminated. This is the fatal defect of the open contact. From the above situation, it can be seen that the technical solution of the existing contacts can no longer meet the needs of high-speed railway passenger cars and subway operations, and the improvement plan cannot fundamentally solve the major problems existing in the original design. Summary of the invention

[0004] The purpose of the present invention is to solve the above-mentioned problems and provide an integrated redundant contact group for a railway switch machine, so that the contact group has low wear, flexible movement, no jamming, reliable electrical operation, long life, no trouble, and maintenance-free. The electrical performance is reliable, stable and safe after testing, which can ensure the quality and safety of the use of key railway equipment.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] An integrated redundant contact group for a railway switch includes a bottom shell, an upper shell, a central swing body, a static point unit, a moving contact, a drive block and a terminal. The upper shell has 12 terminals, which are symmetrically arranged on both sides, 6 of which are arranged respectively. Three static point combinations are sequentially arranged on the left, middle and right sides of the lower part. The static point combination consists of a static point left unit and a static point right unit. The moving contacts are arranged at both ends of the central swing body. The moving contacts consist of 6 moving points. A moving point and a static point combination constitute a redundant contact group. The static point unit consists of a static point upper piece and a static point lower piece installed at the lower part of the upper shell with a terminal. The moving points respectively complete the electrical interlocking of electrical contact closure or disconnection with the six static point combinations in the form of linear motion. The bottom shell and the upper shell are combined and fixed as one body through shell fixing parts. The integrated contact group is installed on the base of an automatic switch by installing bolts. The drive block is independently installed on the bracket of the base of the automatic switch by M6 bolts.

[0007] The contact point combination, wherein the center line of the moving point wheel is substantially coplanar with the imaginary planes of the upper and lower pieces of the static point unit, with a deviation of no more than 0.5 mm, and the center line of the moving point wheel is parallel to the planes of the upper and lower pieces of the static point;

[0008] The moving joint is composed of 3 moving point optical axes and 6 moving points;

[0009] The redundant contact group has two upper and lower springs with the same potential in the static point left unit and two upper and lower springs with the same potential in the static point right unit. The upper piece of the static point unit on this side can form an electrical conduction and closure with any metal piece of the upper or lower piece of the static point unit on the other side through the moving point, that is, only one metal piece is needed. Similarly, the lower piece of the static point unit on this side can form an electrical conduction and closure with any metal piece of the upper or lower piece of the static point unit on the other side through the moving point, or conduct current in parallel, crosswise or simultaneously. An extra contact piece is provided to form an electrical contact redundant structure.

[0010] The moving contact and the six static point combinations complete electrical contact in the form of linear motion. Each static point combination on the left and right sides completes electrical connection through the reciprocating linear motion of the moving contact, forming a stable and reliable integrated redundant contact group, which improves the contact safety and reliability of the contact group, which is extremely important in railway signal design.

[0011] Furthermore, the central swing body is composed of a swing upper block, a swing lower block, a roller, a roller shaft, a moving point optical axis, and a moving point. The moving point optical axis is fixed on the roller, and the moving point is fixed at both ends of the moving point optical axis. The roller shaft is arranged at the center of the roller, and the swing upper block and the swing lower block are connected up and down, and the moving point optical axis and the moving point are fixed on the swing upper block and the swing lower block.

[0012] Furthermore, the driving block is independently installed on the bracket of the base of the automatic opener and closer, and is driven by the indicating rod to rotate and swing left and right in a fan shape. The driving block pushes the roller, and the roller drives the central swing body and its moving point optical axis to perform reciprocating linear motion along the inner wall of the guide block. The moving points at both ends of the moving point optical axis perform linear driving and pulling motion under its push.

[0013] Preferably, the moving contact adopts a solid dumbbell structure, which has the advantages of high mechanical strength, good rotation, and slight wear. The side of the moving point has an arc surface with a small angle and small friction. The moving point can rotate freely and smoothly in the light holes at both ends of the optical axis under the push of the friction force of the contact piece. The axis is small and the rotational inertia is large, which is conducive to rotation. There is no wear of the fixed point that affects the life of the moving point. The thin-walled moving contact ring and the retaining ring blocking structure are eliminated, and there is no risk of breakage failure of the open pin, retaining ring, contact column, etc. The moving contact adopts either a plug-in shape or other shapes.

[0014] Preferably, the contact pieces all have a radius of ≥R1 at the bends, and all the width transitions of the pieces have a radius of ≥R1. The contact pieces are subjected to aging heat treatment and grinding processes to ensure the mechanical properties of the product.

[0015] Preferably, the lead-out portion of the static point unit adopts an upwardly turned structure or a backwardly extended structure, and the outer ends of the static point upper piece and the static point lower piece are both connected to external wires.

[0016] Preferably, the contact group for the switch machine uses a combination of six (3*2) static points, and the contact group for the close-fitting indicator uses a combination of four (2*2) static points.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention is an integrated redundant contact unit, which has the same installation and external dimensions as existing equipment and is completely interchangeable with existing contacts, greatly improving performance and upgrading functions, without the need for adjustment and simple installation; it adopts electrical contact redundancy technology, technology for converting fan-shaped rotational swing into reciprocating linear motion, line contact technology, overall stability technology and interchangeability technology, etc.; it adopts optical axis, bearing and rolling technology in many places, so that the contact group has very low wear, flexible movement, no card group, reliable electrical action, long life, no trouble, and maintenance-free. After various tests, it has met the highest requirements of the China Railway Corporation for the contact group, and the electrical performance is reliable, stable and safe; it solves many defects of existing equipment, such as point contact, broken retaining ring, broken contact column, large unilateral deviation of contact piece and many other faults affecting electrical contact, and can ensure the quality and safety of the use of key railway equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only for the purpose of more clearly illustrating the technical solutions in the embodiments of the present invention or the prior art. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 , Figure 2 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 3 for Figure 1 A schematic diagram of a partial cross-section viewed from above;

[0022] Figure 4 , 5 6 is a schematic diagram of the contact combination structure;

[0023] Figure 7 , 8 9 is a schematic diagram of the structure of the central swing body;

[0024] Fig.10 It is a schematic diagram of a static point unit in the form of a rear extension of the terminal lug;

[0025] Fig.11 Schematic diagram of the moving point in the form of independent drive;

[0026] Fig.12 This is a schematic diagram of the structure in which one driving block drives three moving points;

[0027] Fig.13 This is a schematic diagram of the contact combination method for a close-fitting indicator.

[0028] In the figure: 1-bottom shell, 2-upper shell, 3-central swing body, 4-upper piece, 5-moving contact, 6-lower piece, 7-driving block, 8-shell fixing part, 9-mounting bolt, 10-binding post, 11-static point right unit, 12-static point left unit, 13-guide block, 14-concave and convex groove, 15-moving point optical axis, 16-roller, 17-insulating protective cover, 18-seal, 19-moving point, 20-swing lower block, 21-swing upper block, 22-roller shaft, 23-automatic switch base, 25-external wiring, 26-rear extension wiring. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand and implement the technical solution of the present invention, the present invention is further described below in conjunction with specific embodiments. However, the embodiments are only intended to illustrate the present invention and not to limit the present invention.

[0030] like Figure 1-13An integrated redundant contact group for a railway switch shown in the figure includes a bottom shell 1, an upper shell 2, a central swing body 3, a static point unit, a moving contact 5, a drive block 7, an insulating protective cover 17 and a terminal 10, etc. The bottom shell 1 and the upper shell 2 are fixed by a shell fixing member 8, the integrated contact group is installed on the automatic switch base 23 by installing bolts 9, and the drive block 7 is independently installed on the bracket of the automatic switch base 23 by M6 bolts.

[0031] like Figure 1-6 The static point unit is composed of a static point upper piece 4 and a static point lower piece 6 installed on the lower part of the upper shell 2 with a terminal 10, and the moving point 19 is respectively combined with the six static points to complete the electrical interlocking of electrical contact closure or disconnection in the form of linear motion.

[0032] like Figure 1-5 Each redundant contact group is composed of a static point left unit 12, a static point right unit 11 and a moving point 19. Each static point unit is composed of a static point upper piece 4 and a static point lower piece 6, and is fixed to the upper housing 2 by a terminal 10.

[0033] Further, such as Figure 1 , 2 , 4, 5, for each contact combination, the center line of the moving point wheel is basically coplanar with the imaginary plane of the center of the upper and lower pieces of the static point unit, and there can be an upper and lower deviation of no more than 0.5mm, and the center line of the moving point wheel is parallel to the plane of the upper and lower pieces of the static point unit. Each group of contacts, through the reciprocating linear motion of the moving contact 5, contacts with the static point units on the left and right sides to complete the electrical connection, forming a redundant contact group. Since there are two upper and lower springs 4 and 6 with the same potential in the static point left unit 12 and two upper and lower springs with the same potential in the static point right unit 11, the upper piece 4 of the static point unit on this side can form an electrical conduction closure with any metal piece of the upper piece 4 or lower piece 6 of the static point unit on the other side through the moving point 19, that is, one metal piece is enough. Similarly, the lower piece 6 of the static point unit on this side can form an electrical conduction closure with any metal piece of the upper piece 4 or lower piece 6 of the static point unit on the other side through the moving point 19, or conduct current in parallel, crosswise or simultaneously, and an extra contact piece is set to form an electrical contact redundant structure;

[0034] Furthermore, each contact point group is formed by adjacent static point right units 11 and static point left units 12 to form a static point combination;

[0035] Further, such as Figure 6 , 1 integrated contact combination, the switch machine indicates that the circuit contact group uses 6 (3*2) static contact combinations; Fig.13 , the contact group for the close-fitting indicator uses a combination of 4 (2*2) static contacts;

[0036] The moving contact 5 (for the switch machine) is formed by three moving point optical axes 15 and six moving points 19; further, as Fig.12 The central swing body 3 and the moving point 19 can also be combined and divided into three, each independent (the swing block is then changed to 3 slots); the contact group for the close-fitting indicator can be composed of 2 combinations.

[0037] The moving point 19 can also be in the shape of an existing ring or inclined insert, and the surface of the moving point metal wheel can be rolled with diagonal patterns or rolled with mesh patterns.

[0038] As a preferred technical solution of the present invention, the contact switch combination maintains the original left and right unit structure, but the direction is different from the original. The vertical sheet ring is rotated 90° to a horizontal position. A spring with the same potential is added during the design to form a redundant structure. The upper sheet or lower sheet on any side can be electrically connected to any upper or lower contact sheet on the other side through the moving contact to form contact redundancy, thereby improving the contact safety and reliability of the contact group. With 6 external terminals 10 for 3 channels on the left and 6 external terminals 10 for 3 channels on the right, the moving contact 5 combination maintains 3 channels with a total of 6 contact wheels, achieving the same circuit performance and quantity switch relationship, and solving many defects of existing equipment, such as point contact, broken retaining ring, broken contact column, large unilateral deviation of the contact sheet, unconscious human damage during transportation, installation and maintenance, and many other faults that affect electrical contact.

[0039] As a preferred technical solution of the present invention, the contact driving mechanism composed of the driving block 7, the central swing body 3 and the roller 16, the moving point optical axis 15, the inner partition of the bottom shell 1 and the guide block 13 therein is one of the technical cores of the present invention. The reciprocating linear motion of the moving point enables the moving point to form 100% line contact when it hits the static point.

[0040] As a preferred technical solution of the present invention, the moving point 19 adopts a solid dumbbell structure, and the side of the moving point 19 has an arc surface with a small angle and small friction. The moving point 19 can rotate freely and smoothly in the light holes at both ends of the optical axis under the push of the friction of the contact sheet. The shaft is small and the rotational inertia is large, which is conducive to rotation, and there is no wear of the fixed point to affect the life of the moving point. The existing thin-walled moving contact ring and retaining ring blocking structure are eliminated, forming a high mechanical strength, good rotation, and no potential breakage failure hazards such as split pin retaining ring contact column.

[0041] like Fig.10 The static point unit can adopt a wiring part flip-up structure and a rear extension structure, and the rear extension wiring 26 method is shown in the figure.

[0042] The technology of the present invention is used to control the action of railway turnout switch machines, indicate that the inbound and outbound turnouts stay in the fixed or reverse position and state, and realize the moving contact group of mechanism locking and electrical interlocking, and is particularly suitable for the integrated contact group supporting the switch machines used in high-speed railways or subways.

[0043] The technical innovations of the present invention are mainly as follows:

[0044] 1) The integrated structure solves the problem that the contact piece is offset to one side due to personal skills during assembly and on-site maintenance of the switch machine, resulting in a virtual connection due to too little pressure on one side of the contact, or a fault of instantaneous bouncing open due to vibration. The present invention uses upper and lower pieces with the same potential and a large compression displacement to ensure overtravel and contact pressure;

[0045] 2) The static contact uses two sets of upper and lower springs with the same potential, maintaining the original left-right connected switch form to form a redundant structure. The upper or lower piece on either side can be connected to any upper or lower piece on the other side through the moving contact to form a connected state, forming electrical contact redundancy and improving contact safety and reliability. For example, if any piece is broken, the electrical connection state can still be maintained without affecting the switch relationship;

[0046] 3) The static contact spring shrinks inward when the moving contact impacts, maintaining 100% line contact with the moving contact, overcoming the existing situation where the contacts are only in line contact when the center lines are perpendicular to each other, and in other cases are in point contact. After long-term use and running-in, the contact line width will increase. During production, it cannot be guaranteed that the contact line exceeds 1 / 2 at any penetration depth. This product defect is due to design;

[0047] 4) The moving contact 5 adopts a solid dumbbell structure, eliminating the thin-walled ring shape and the retaining ring blocking structure, forming a good rotation without the hidden dangers of breakage and rupture;

[0048] 5) The roller 16 is moved up and down in combination with the fan-shaped rotation to form a linear motion of the moving contact, replacing the original fan-shaped rotation driving structure. This is one of the core technologies of the integrated contact, the basis for the action of the contact switch, and the basis for interchangeability with the original contact products.

[0049] The contents not described in detail in the present invention are all prior art.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. It is particularly pointed out that similar structures such as 2-group or 1-group contact combinations used in other railway contact series products are also within the protection scope.

Claims

1. An integrated redundant contact assembly for a railway switch machine, comprising a bottom shell (1), an upper shell (2), a central swing body (3), a static point unit, a moving contact (5), a drive block (7) and a terminal (10), characterized in that: The upper shell (2) has 12 upper terminals (10), which are symmetrically arranged on two sides, with 6 terminals on each side. Three static point combinations are sequentially arranged on the left, middle and right sides of the lower part. The static point combination is composed of a static point left unit (12) and a static point right unit (11). The moving contact (5) is arranged at both ends of the central swing body (3). A moving point (19) and a static point combination constitute a redundant contact group. The static point unit is composed of a static point upper piece (4) and a static point lower piece (6) mounted on the lower part of the upper shell (2) by terminals (10). The moving point (19) and the six static point combinations respectively complete the electrical interlock of electrical contact closing or disconnection in the form of linear motion. The bottom shell (1) and the upper shell (2) are combined and fixed as a whole by a shell fixing piece (8). The integrated contact group is mounted on the automatic switch base (23) by mounting bolts (9). The drive block (7) is independently mounted on the bracket of the automatic switch base (23) by M6 bolts. A joint combination, wherein the center line of the moving point wheel is substantially coplanar with the imaginary planes of the upper and lower pieces of the static point unit, and the center line of the moving point wheel is parallel to the planes of the upper and lower pieces of the static point; The moving contact (5) is composed of three moving point optical axes (15) and six moving points (19); The redundant contact group is due to having two upper and lower spring sheets (4) and lower sheets (6) of the same potential in the static point left unit (12) and two upper and lower spring sheets (4) and lower sheets (6) of the same potential in the static point right unit (11). The upper sheet (4) of the static point unit on this side can form an electrical conduction and closure with any metal sheet of the upper sheet (4) or lower sheet (6) of the static point unit on the other side through the moving point (19), that is, one metal sheet. Similarly, the lower sheet (6) of the static point unit on this side can form an electrical conduction and closure with any metal sheet of the upper sheet (4) or lower sheet (6) of the static point unit on the other side through the moving point (19), or conduct current in parallel, crosswise or simultaneously. An extra contact sheet is provided to form an electrical contact redundant structure. The movable contact (5) and the six static point combinations complete electrical contact in the form of linear motion, and each static point combination on the left and right sides completes electrical connection through the reciprocating linear motion of the movable contact (5), thereby forming an integrated redundant contact group; The central swing body (3) is composed of a swing upper block (21), a swing lower block (20), a roller (16), a roller shaft (22), a moving point optical axis (15), and a moving point (19); the moving point optical axis (15) is fixed on the roller (16); the moving point (19) is fixed on both ends of the moving point optical axis (15); the roller shaft (22) is arranged at the center of the roller (16); the swing upper block (21) and the swing lower block (20) are connected vertically; and the moving point optical axis (15) and the moving point (19) are fixed on the swing upper block (21) and the swing lower block (20); The driving block (7) is independently mounted on a bracket of the automatic shutter base (23), and is driven by the indicating rod to rotate and swing in a left and right fan shape. The driving block (7) pushes the roller (16), and the roller (16) drives the central swing body (3) and its moving point optical axis (15) to perform reciprocating linear motion along the inner wall of the guide block. The moving points (19) at both ends of the moving point optical axis (15) perform linear driving and pulling motion under the push of the driving block.

2. The integrated redundant contact group for railway switch according to claim 1, characterized in that: The movable contact (5) adopts a solid dumbbell structure, a plug-in shape or other shapes.

3. The integrated redundant contact group for railway switch according to claim 1, characterized in that: The lead-out part of the static point unit adopts an upward flipping structure or a backward extending structure.

4. The integrated redundant contact group for railway switch according to claim 1, characterized in that: The contact group for the switch machine uses a combination of six (3*2) static points, and the contact group for the close-fitting indicator uses a combination of four (2*2) static points.

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