CN217558075U - Brake device for platform door driving unit - Google Patents

Abstract

The utility model discloses a braking device for a platform door driving unit, which is arranged on a driving motor and connected with a motor shaft of the driving motor, and comprises a motor brake and an absolute value encoder, wherein the motor shaft of the driving motor passes through the motor brake and is connected with the absolute value encoder; the motor brake is used for locking the motor shaft after power failure, so that the in-place locking function of the door body is realized; the absolute value encoder is used for memorizing the rotation angle of the motor shaft, outputting corresponding position parameters and having a power-off memory function. The utility model discloses system security and reliability are high, and fundamentally has solved the drive control of the portable novel platform door of full open difficult, the difficult and poor problem of fail safe nature of locking that targets in place.

Description

Brake device for platform door driving unit

Technical Field

The utility model relates to an urban rail transit and high-speed railway platform door technical field especially relate to a platform door arresting gear for drive unit.

Background

In a track platform door system, a direct current motor, a mechanical lock or an electromagnetic lock and a zero position switch are mostly adopted to realize door body driving control and door in-place locking functions, the system mostly utilizes Hall signal feedback of the direct current motor to realize the positioning of the position of a door body, but after power failure or electric signal loss occurs, the system loses corresponding position information, and at the moment, the zero position switch is required to reset and the zero position of the door body is determined again. The brake device is suitable for movement with determined action direction and determined travel, has good adaptability and reliability, and is successful on a platform door of the rail transit. However, when the platform door system has some special working conditions, for example, the motor may rotate forward or backward under the action of opening the door, the position of the motion end is uncertain, and the door body needs to be locked at different positions, the conventional platform door braking device loses its adaptability and reliability under these conditions, and cannot provide a reliable basis for the safety requirements of the system.

The novel full-open movable platform door is released in the existing market, the platform door can realize the functions of opening the door at any position and opening the door with an ultra-large opening, and the requirement of the full-open movable novel platform door on the braking function of a system is very high. All door unit bodies of the platform door can move, the direction of the door opening position of the main movable door is indefinite, the stroke is indefinite, direction and position judgment basis is lacked after the main movable door is electrified again, and even if a zero position switch is adopted, the zero position can be difficult to realize due to the fact that the specific position and the positive and negative directions of the door body cannot be determined; at the same time, the undefined travel makes point-to-point mechanical locking of the platform door difficult. These above problems present a significant challenge to the security and reliability of such new platform doors.

Therefore, there is a need to develop a safe and reliable braking device for a driving unit based on the service conditions of a fully-opened novel platform door, which can automatically reset after power failure and has a low cost.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a solve the problem that prior art exists, provide a platform door arresting gear for drive unit, this arresting gear adopts and carries out the module on low cost's driving motor basis and installs additional to realize the locking of the portable platform door body of opening entirely, fundamentally has solved the locking functional requirement of the portable platform door of opening entirely that all door bodies all can do.

The utility model discloses a brake device for platform door drive unit, the brake device is installed on the drive motor and connected with the motor shaft of the drive motor, including the motor brake and the absolute value encoder, the motor shaft of the drive motor passes through the motor brake and is connected with the absolute value encoder; the motor brake is used for locking the motor shaft after power failure, so that the in-place locking function of the door body is realized; the absolute value encoder is used for memorizing the rotation angle of the motor shaft, outputting corresponding position parameters and having a power-off memory function.

Preferably, the motor brake comprises a magnetic yoke assembly, an armature, a shaft sleeve, a friction plate, a spring and a connecting plate, wherein the magnetic yoke assembly and the armature are sequentially sleeved on the motor shaft, a spring groove for accommodating the spring is formed in the side, close to the armature, of the magnetic yoke assembly, one end of the spring is abutted with the magnetic yoke assembly, and the other end of the spring is abutted with the armature; the shaft sleeve is fixedly connected with a motor shaft through a set screw, so that the armature can move between the shaft sleeve and the magnetic yoke assembly when power is lost, the friction plate is positioned between the connecting plate and the armature and is fixed on the armature, and the connecting plate is fixed on the driving motor.

Preferably, the driving motor is a dc brushless speed reducing motor.

Preferably, the absolute value encoder is a gear multi-turn absolute value encoder.

The utility model has the advantages and positive effects that:

the utility model discloses a arresting gear is different from being applied to the platform door body braking of confirming the action direction and confirming the stroke in the past, and motor brake and absolute value encoder module are introduced in the innovation, for the platform door of the indefinite stroke of two-way motion, have laid the hardware basis of drive unit locking function, overturn in the past and adopt the design of door body structure locking, utilize the motor shaft braking to lock and realize the door body locking function; the braking device for the platform door driving unit adopts the direct-current brushless speed reducing motor, is low in cost and simple to control, does not lose position information when power is off, automatically locks when power is off, and guarantees the safety protection function of the platform door under the unexpected condition.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural view of a braking device for a platform door driving unit according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of the inside of the motor brake provided by the embodiment of the present invention.

Description of reference numerals:

1. a drive motor; 101. a motor shaft;

2. a motor brake; 201. a yoke assembly; 202. a shaft sleeve; 203. an armature; 204. a friction plate; 205. a coupling plate; 206. a spring; 207. tightening the screw;

3. an absolute value encoder.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1 and 2, the present embodiment provides a braking device for a platform door driving unit, the braking device is mounted on a driving motor 1 and connected to a motor shaft 101 of the driving motor 1, and includes a motor brake 2 and an absolute value encoder 3, the motor shaft 101 of the driving motor 1 passes through the motor brake 2 and is connected to the absolute value encoder 3; the motor brake 2 is used for locking the motor shaft 101 after power failure, so that the in-place locking function of the door body is realized; the absolute value encoder 3 is used for memorizing the rotation angle of the motor shaft 101, outputting corresponding position parameters and having a power-off memory function. Even if the door body is manually moved after power failure, the accurate relative zero position can be obtained according to the specific position information output by the absolute value encoder 3 after power failure. Wherein, driving motor 1 is DC brushless gear motor, adopts DC brushless gear motor and motor brake 2 and the cooperation of absolute value encoder 3, and is with low costs, and control is simple, and the outage does not lose positional information, and the automatic locking of outage guarantees the platform door safety protection function under the unexpected condition. The absolute value encoder 3 is a gear multi-turn absolute value encoder, and the specific model can be selected from a 28156b automatic GME-58-RS-13/12-0.5-10/28-SGM-65-B absolute value encoder.

The motor brake 2 comprises a magnetic yoke assembly 201, an armature 203, a shaft sleeve 202, a friction plate 204, a spring 206 and a connecting plate 205, wherein the magnetic yoke assembly 201 and the armature 203 are sequentially sleeved on the motor shaft 101, a spring groove for accommodating the spring 206 is formed in the side, close to the armature 203, of the magnetic yoke assembly 201, one end of the spring 206 is abutted against the magnetic yoke assembly 201, and the other end of the spring is abutted against the armature 203; the shaft sleeve 202 is fixedly connected with the motor shaft 101 through a set screw 207, so that the armature 203 can move between the shaft sleeve 202 and the magnetic yoke assembly 201 when power is lost, the friction plate 204 is positioned between a connecting plate 205 and the armature 203 and is fixed on the armature 203, and the connecting plate 205 is fixed on the driving motor 1. Under the condition of electrification, the magnetic yoke assembly 201 attracts the armature 203, a gap is reserved between the friction plate 204 and the connecting plate 205, and the motor shaft 101 rotates smoothly; after the power is cut off, the magnetic yoke assembly 201 loses the function, the adsorption force between the magnetic yoke assembly 201 and the armature 203 disappears, the spring 206 recovers deformation and presses the armature 203, the friction plate 204 is attached to the connecting plate 205, the braking of the motor shaft 101 is realized, and the effect of power-off braking is achieved.

When a fully-open movable platform door system receives a door opening instruction and calls corresponding door unit position parameters, the system drives the driving motor 1 to rotate to enable the door body to reach a specific position, the position of the door body is checked according to position information in the absolute value encoder 3, the motor brake 2 is powered off after the door body is determined to reach a required position, the motor shaft 101 is locked, and the door body is locked in place at the moment.

The position information of the absolute value encoder 3 is determined by the mechanical position, and when power failure and electric signal loss occur, the system can also determine the specific position of the door body after power restoration and continue to complete the next action.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (4)

1. A braking device for a platform door driving unit is characterized in that the braking device is arranged on a driving motor and connected with a motor shaft of the driving motor, and comprises a motor brake and an absolute value encoder, wherein the motor shaft of the driving motor penetrates through the motor brake and is connected with the absolute value encoder; the motor brake is used for locking the motor shaft after power failure, so that the in-place locking function of the door body is realized; the absolute value encoder is used for memorizing the rotation angle of the motor shaft, outputting corresponding position parameters and having a power-off memory function.

2. The brake device for a platform door driving unit according to claim 1, wherein the motor brake includes a yoke assembly, an armature, a shaft sleeve, a friction plate, a spring and a coupling plate, the yoke assembly and the armature are sequentially sleeved on the motor shaft, the yoke assembly is provided with a spring groove for accommodating the spring at a side close to the armature, one end of the spring abuts against the yoke assembly, and the other end abuts against the armature; the shaft sleeve is fixedly connected with a motor shaft through a set screw, so that the armature can move between the shaft sleeve and the magnetic yoke assembly when power is lost, the friction plate is positioned between the connecting plate and the armature and is fixed on the armature, and the connecting plate is fixed on the driving motor.

3. The brake device for a platform door driving unit according to claim 1, wherein the driving motor is a dc brushless speed reduction motor.

4. The brake apparatus for a platform door driving unit according to claim 1, wherein the absolute value encoder is a geared multi-turn absolute value encoder.

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