JP2015218024A - Balance mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a balance mechanism that has a structure without using a balance weight, is decreased in weight, is reduced in the weight serving as a drive object, can be constituted at a low cost by using a motor of a low output, and can save a space.SOLUTION: This balance mechanism is provided with a balance member so as to match with the weight of an object 16 provided to move up and down with respect to the object 16. The balance mechanism has mechanism units 11, 12 and 13 for making a balance relationship, and the balance member is an elastic member 18 with a portion connected to the mechanism unit. In the balance mechanism, a portion uses a coupled elastic member, so that the weight of the whole equipment is reduced, the weight of a portion serving as a drive object is reduced, and thereby a drive motor of a low output can be used.

Description

  The present invention relates to a balancing mechanism, and more particularly to a balancing mechanism that is suitable for reducing the overall weight of the device and reducing the inertial force at the start of the lifting operation.

  An example of an elevator balancing mechanism will be described with reference to FIG. 4 as a representative example of a conventional balancing mechanism. In FIG. 4, reference numeral 101 denotes, for example, a car that moves up and down the hoistway, and the car 101 functions as an elevating unit. A person gets in the basket 101. The car 101 is coupled to a wire rope 102, for example. The wire rope 102 has an annular shape and is bridged between a pulley 103 at the upper end and a pulley 104 at the lower end. The shaft portion of the pulley 103 at the upper end is connected to the drive shaft 105 a of the drive device 105. In the wire rope 102, a counterweight 106 is attached to the portion on the opposite side of the pulley 103, 104 with respect to the portion to which the car 101 is attached. The counterweight 106 has the same weight as the car 101, has a function of balancing the balance, and is also called a counterweight. When the rotational driving force is not applied to the pulley 103 from the driving device 105, the car 101 and the counterweight 106 are in a balanced state, the wire rope 102 does not move, and the car 101 and the counterweight 106 are stationary. It is in. When a driving force for lowering the car 101 is applied to the pulley 103 from the driving device 105, the car 101 located at the upper end as shown in FIG. 4 descends while maintaining a balance with the counterweight 106. . On the other hand, when a rotational driving force for raising the car 101 is applied from the driving device 105 to the pulley 103, the car 101 at the lower position rises while maintaining a balance with the counterweight 106.

  The above-described balancing mechanism is a balancing mechanism between the car 101 and the balancing weight 106 in the elevator. Conventionally, a similar balancing mechanism is also used for a general lifting unit other than the car 101. .

  As known literatures on conventional balancing mechanisms, an elevator disclosed in Patent Document 1 and an elevator apparatus disclosed in Patent Document 2 are known. In either case, the rope has both a cage and a counterweight at both ends.

JP 2013-6669 A Japanese Patent Laid-Open No. 9-151059

  In the conventional lifting drive system equipped with a balancing mechanism using a balancing weight, there is a problem that the weight of the balancing weight increases, the weight of the device to be moved increases, and the weight of the entire device becomes large. there were. Further, when viewed from the drive device side, it is necessary to consider the inertial force corresponding to the total weight of the lifting part and the counterweight as the driving force required when starting the lifting drive. . For this reason, there has been a problem that the drive device needs to generate a large driving force at the start of the elevation drive, and a motor having a large output is required. Furthermore, in the case of a configuration using a counterweight, the counterweight moves up and down the same distance in accordance with the elevating operation of the elevating unit, so that a hoistway space for moving the counterweight is required. Therefore, there has been a problem that the device size of the lifting drive system becomes large.

  In view of the above-described problems, an object of the present invention is to use a structure that does not use a counterweight, to reduce the weight of the entire device, to reduce the weight to be driven, and to be configured at low cost using a low-output motor. It is another object of the present invention to provide a balancing mechanism that can achieve further space saving.

  The balancing mechanism according to the present invention is configured as follows to achieve the above object.

  The first balancing mechanism (corresponding to claim 1) is a balancing mechanism in which a balancing member is provided so as to balance the weight of the object with respect to the object provided to move up and down. It has a mechanism part to make, and a balance member is an elastic member in which a part was combined with the mechanism part.

  In the above balancing mechanism, a balance member that has a mechanism portion that balances the object to be lifted and that balances the object, and a telescopic member that is partially coupled to the mechanism portion; Therefore, the entire device can be reduced in weight, the weight of the portion to be driven can be reduced, and a low-output drive motor can be used.

  In the above configuration, the second balance mechanism (corresponding to claim 2) is preferably coupled to an annular member spanned between two pulleys arranged in a vertical positional relationship. The telescopic member is characterized in that one end is fixed and the other end is coupled to the annular member, and the balance of balance is maintained so that the telescopic member is in the most contracted state when the object is in the uppermost position.

  In the above configuration, the third balancing mechanism (corresponding to claim 3) is preferably configured such that the elastic member is a spring fixed at one end so as not to move and coupled at the other end to an annular member. It is set so that the tensile force of the spring and the weight of the object are balanced, and the operation of the drive device that raises and lowers the object is controlled by assuming that only the weight of the object is an inertial load at the start of raising and lowering drive. To do.

  In the above configuration, the fourth balancing mechanism (corresponding to claim 4) is preferably a spring in which the spring is a spring, and the other end of the spring is coupled to the annular member via the rotating shaft portion. It is provided so that it may lead to.

  In the above configuration, the fifth balancing mechanism (corresponding to claim 5) is preferably provided with a lock mechanism that fixes the position of the object when the object is in the lowest position.

  In the above configuration, the sixth balancing mechanism (corresponding to claim 6) is preferably characterized in that the object is a movable fence of a liftable platform fence.

  According to the present invention, the counterweight is not used as a means for balancing the weight between the object to be lifted and lowered, but instead the balance is achieved by using an elastic member such as a spring. It is possible to reduce the weight of the entire device, reduce the weight to be lifted and lowered, and as a result, the object can be lifted and lowered using a low output motor. It can be configured at a low cost, and further exhibits the effect that space saving can be realized because it does not use a lifting and lowering counterweight.

It is a block diagram explaining the basic composition of the balance mechanism concerning the present invention. It is a conceptual diagram explaining the principle of a balance mechanism. It is a perspective view which shows the representative example of an expansion-contraction member. It is a block diagram which shows the conventional typical balance mechanism.

  DESCRIPTION OF EMBODIMENTS Preferred embodiments (examples) of the present invention will be described below with reference to the accompanying drawings.

  A representative embodiment of a balancing mechanism according to the present invention will be described with reference to FIGS. In FIG. 1, (A) shows a state in which an object to be moved up and down is at the highest position (uppermost position), and (B) shows a state in which the object is at the lowest position (lowermost position). Yes. FIG. 2 is a view for conceptually explaining the principle of the balancing mechanism according to the present invention.

  In FIGS. 1A and 1B, two pulleys 11 and 12 are installed in a vertical positional relationship in the vertical direction. For example, the pulley 11 is a driving pulley on the upper side, and the lower pulley. Reference numeral 12 denotes a receiving pulley. Between the upper pulley 11 and the lower pulley 12, a belt (or chain, wire rope, etc.) 13 having an annular shape is stretched. A rotation center shaft 11 a of the driving pulley 11 is connected to a driving shaft 14 a of the motor 14. Accordingly, when the rotation center shaft 11a of the pulley 11 receives a clockwise or counterclockwise rotational driving force from the drive shaft 14a of the motor 14, the pulley 11 rotates clockwise or counterclockwise. The rotation operation of the motor 14 is controlled based on a control signal given from the controller 15. The content of the control related to the rotation operation of the motor 14 is, for example, the magnitude of the driving force that opposes and exceeds the direction of rotation and the inertial load that occurs at the start of the lifting drive. In the example shown in FIG. 1, as will be described later, when the pulley 11 is driven to rotate in the clockwise direction, it corresponds to the lowering operation (the changing operation from (A) to (B) in FIG. 1). When it is rotationally driven in the counterclockwise direction, it corresponds to an ascending operation (operation of change from (B) to (A) in FIG. 1).

  An object 16 for moving up and down is attached to the belt 13 via a coupling portion 17. A specific example of the object 16 is arbitrary, and is, for example, a movable fence of an elevating platform fence installed in a station platform, or an elevator elevating car installed in a building or the like. The object 16 is attached to a portion of the belt 13 located on one side (for example, the right side in FIG. 1A) with a vertical line connecting the two pulleys 11 and 12 located at the upper and lower positions as a central axis. In FIG. 1A, the object 16 exists at the highest position. Further, a coil spring 18, for example, is connected to the belt 13 located on the other side (for example, the left side in FIG. 1A) with the vertical line connecting the two pulleys 11 and 12 as a central axis via a coupling portion 19. Attached. The coil spring 18 is fixed at a lower end portion 18 a connected to a fixing portion such as a floor surface 20 in the drawing, and further connected at an upper end portion 18 b to the belt 13 via a coupling portion 19. In the illustrated example of FIG. 1A, the coil spring 18 is relatively short and contracted.

  In FIG. 1B, the pulley 11 is rotated clockwise by a predetermined angle from the state shown in FIG. 1A, and as a result, the belt 13 is rotated by a predetermined distance as indicated by an arrow A. The object 16 is moved downward, the object 16 is lowered, and the object 16 is moved to the lowest position. At this time, since the coupling portion 19 moves to the uppermost position as the belt 13 moves, the coil spring 18 becomes relatively long and extended as shown in the figure.

  On the other hand, from the state shown in FIG. 1B, the pulley 11 is rotated counterclockwise by a predetermined angle, and as a result, the belt 13 moves counterclockwise by a predetermined distance as shown by an arrow B. Then, the object 16 is raised, the object 16 is moved to the uppermost position, and the state shown in FIG. At this time, the coil spring 18 is relatively shortened and shortened as shown in the figure because the coupling portion 19 moves to the lowest position as the belt 13 moves.

  In the configuration shown in FIG. 1, pulleys 11, 12 arranged at vertical positions in the vertical direction, and an annular belt 13 spanned between the pulleys 11, 12, and an object 16 and a coil spring 18 are connected. The belt 13 attached in a line-symmetrical positional relationship is configured as a mechanism that creates a balanced relationship between the object 16 and the balancing member, and further, the belt 13 is a counter member based on the coil spring 18 described above as the balancing member. The force (tensile force) is used to balance the weight of the object 16. Next, the balance relationship between the object 16 and the coil spring 18 will be described with reference to FIG.

  FIG. 2 conceptually shows the balanced relationship between the object 16 and the coil spring 18. In FIG. 2, in a wire rope 22 hung on a pulley 21 rotatably installed around a shaft 21a, an object 16 is coupled to one end, and a lower end 18a is connected to the floor at the other end. A coil spring 18 fixed to the surface 20 is coupled. FIG. 2 is a conceptual image diagram for explaining the balance relationship. In this balanced relationship, the weight Wg (g: gravitational acceleration) based on the mass W of the object 16 and the reaction force (tensile force) F caused by the coil spring 18 that extends to a required length according to the position of the object 16 Are in a balanced state. Thus, according to the balancing mechanism according to the present embodiment, the coil spring 18 (generally a telescopic member) is used as a member for balancing the gravity of the object 16 that moves up and down, and the target A reaction force commensurate with the weight of the object 16 is generated by the coil spring 18. As described with reference to FIG. 1, the object 16 moves so as to move up and down in the C direction based on driving by the motor 14. For this reason, the length of the coil spring 18 is determined according to the moving position of the object 16, and the reaction force F generated by the coil spring 18 at that time is generated according to the length of the coil spring 18. Basically, an approximate reaction force (force F) that balances the weight Wg of the object 16 is generated by a tensile force determined by the length of the coil spring 18.

  In the state where the driving force for activation by the motor 14 shown in FIG. 1 is not applied, the weight Wg of the object 16 and the reaction force F of the coil spring 18 are balanced. In the balanced state, when the object 16 is moved up and down by the motor 14 as indicated by the arrow C, the motor 14 moves the object 16 relative to the driving pulley 21 (corresponding to the pulley 11 in FIG. 1). Rotation driving force for starting up and down driving required for is provided. The rotational driving force for starting up and down driving corresponds to an inertial load determined mainly only by the weight Wg of the object 16 and is a rotational driving force exceeding this. In other words, in the case of the balancing mechanism according to the present embodiment, only the weight of the object 16 needs to be considered in the control of the rotational driving force output from the motor 14 when raising and lowering the object 16. The weight of the coil spring 18 which is a balance member can be almost ignored. That is, according to the balance mechanism according to the present embodiment, the reaction force for balancing the weight Wg of the object 16 is generated by the force generated based on the expansion / contraction function of the coil spring 18, and further, by this configuration, the motor 14 The driving force at the time of starting up and down driving can be reduced because only the weight of the object 16 is targeted and the weight of the driving object can be reduced.

  Furthermore, according to the balance mechanism according to the present embodiment, the coil spring 18 itself does not move but expands and contracts as compared with a conventional balance mechanism using a weight, so that it does not require a space for movement. Have. For this reason, the structure of the balance mechanism can be made compact.

  In the above balancing mechanism, it is preferable that a locking mechanism for fixing the position of the object 16 when the object 16 is at the lowest position can be provided. Such a lock mechanism is a means for ensuring the safety of the balance mechanism when, for example, a problem occurs in the coil spring 18. Further, the lock operation by the lock mechanism can be arbitrarily set according to the purpose even when the object 16 is at a position other than the lowest position. The lock mechanism can be specifically equipped as a mechanical device, but in addition to that, as a drive state of the motor 14, a lock function is provided from a control point of view based on motor drive control based on the controller 15. Can also be realized.

  In the embodiment described above, for the sake of convenience of explanation, the example of the coil spring 18 has been described as the elastic member. However, as the spring member, a spring unit of a spring spring can be used as shown in FIG. The spring unit 31 houses a spring spring 33 in a cylindrical container 32, and has a structure in which a wire 34 coupled to a rotating shaft portion of the spring spring 33 is drawn from a case frame body 35. The distal end portion 34a of the wire 34 is coupled to the coupling portion 19 described above. In the spring unit 31, the spring spring 33 is configured to extend when the wire 34 is further pulled out from the case frame body 35, and the spring spring 33 is contracted when the wire 34 is pulled into the case frame body 35.

In addition, rubber or a force generator having an equivalent expansion / contraction function can be used as the expansion / contraction member in the balance mechanism of the present embodiment.

  The configurations, shapes, sizes, and arrangement relationships described in the above embodiments are merely schematically shown to the extent that the present invention can be understood and implemented, and the numerical values and the compositions (materials) of the respective components Is just an example. Therefore, the present invention is not limited to the described embodiments, and can be variously modified without departing from the scope of the technical idea shown in the claims.

  The balancing mechanism according to the present invention is used as a means for creating a balance with the weight of the lifting device in an apparatus having a device that lifts and lowers such as an elevator or a lifting platform fence.

DESCRIPTION OF SYMBOLS 11, 12 Pulley 13 Belt 14 Motor 15 Controller 16 Object 17 Coupling part 18 Coil spring 19 Coupling part 20 Floor 21 Pulley 22 Wire rope 31 Spring unit 32 Container 33 Spring spring 34 Wire 35 Case frame body 101 Basket 102 Wire rope 103 Pulley 104 Pulley 105 Driving device 106 Counterweight

Claims (6)

  In a balancing mechanism provided with a balancing member so as to balance the weight of the object with respect to the object provided to move up and down, the balancing member has a mechanism part that creates a balancing relationship, and the balancing member is the mechanism A balancing mechanism, characterized in that it is an elastic member partly coupled to the part.   The object is coupled to an annular member spanned between two pulleys arranged in a vertical positional relationship, and the telescopic member has one end fixed and the other end coupled to the annular member. 2. The balancing mechanism according to claim 1, wherein the balance of balance is maintained so that the elastic member is in the most contracted state when an object is in the uppermost position.   The elastic member is a spring fixed so that the one end does not move and the other end is coupled to the annular member, and is set so that the tensile force of the spring and the weight of the object are balanced, 3. The balancing mechanism according to claim 2, wherein the operation of the driving device for raising and lowering the object is controlled by assuming that only the weight of the object is an inertial load at the start of raising and lowering driving.   The fishing spring according to claim 3, wherein the spring is a spring, and the other end of the spring is connected to a wire coupled to the annular member via a rotating shaft portion. Joint mechanism.   The balancing mechanism according to any one of claims 1 to 4, further comprising a lock mechanism that fixes a position of the object when the object is at a lowest position.   The balancing mechanism according to any one of claims 1 to 5, wherein the object is a movable fence of a liftable platform fence.

Images