JP6674329B2 - Screw type elevator - Google Patents

Description

  The present invention relates to a screw type elevator in which a movable floor is raised and lowered by rotation of a screw shaft provided in a hoistway.

  As an elevator suitable for a relatively low-rise building, a screw-type elevator as described in Patent Literature 1 is known. This screw-type elevator is provided with a screw shaft extending in parallel with the hoistway in the hoistway, and a nut member screwed with the screw shaft on the car side, and the screw shaft is rotationally driven by an electric motor or the like. Thus, the car is configured to move up and down.

JP 2008-184286 A

  A conventional screw-type elevator is provided with a car (car room) for accommodating passengers, similarly to a general rope-type elevator, and is not shown in Patent Literature 1, but is disposed in a hoistway. The car is guided by the guide rail so as to be vertically movable. Therefore, as a simple elevator suitable for a low-rise building, there are many components and there is still room for improvement. Also, in terms of space, a large hoistway is required for the guide rail, which is not preferable.

The screw type elevator according to the present invention includes:
A hoistway surrounded by walls,
A screw shaft arranged at a position offset to one of the cross sections of the hoistway, and extending parallel to the hoistway,
A driving device that rotationally drives the screw shaft,
A movable floor having a nut member with which the screw shaft is screwed, and through which the screw shaft passes,
A pair of roller guides each having two rollers, which are provided at a pair of corner portions of the movable floor opposite to the screw shaft and which are in contact with two adjacent wall surfaces by 90 ° different directions, respectively. Equipment and
It is provided with.

  That is, the screw-type elevator of the present invention does not include a cab or a guide rail, and the movable floor that moves up and down with the rotation of the screw shaft is guided by the wall surface of the hoistway. Passengers move between floors on a movable floor.

  When moving up and down due to the rotation of the screw shaft, the movable floor receives rotation torque accompanying the rotation of the screw shaft, and tries to rotate around the screw shaft in the hoistway. This rotational movement is effectively regulated by a roller guide device located away from the screw shaft.

  In a preferred aspect of the present invention, the roller includes a brake mechanism. Thereby, a braking action can be given to the movable floor.

  In one specific embodiment of the present invention, the screw shaft is disposed in close proximity to a rear wall surface facing the entrance of the hoistway, and a pair of corner portions of the movable floor near the entrance is provided. The roller guide device is disposed at the first position.

Furthermore, the screw-type elevator of the present invention,
  An upper auxiliary nut member that is axially separated from the nut member and is screwed with the screw shaft;
  A lower auxiliary nut member that is axially separated from the nut member and is screwed with the screw shaft;
  A pair of bar-shaped reinforcing members connecting the upper auxiliary nut member to the upper surface of the movable floor,
  A pair of bar-shaped reinforcing members that connect the lower auxiliary nut member to the lower surface of the movable floor and that are arranged so as to be substantially V-shaped in plan view;
  It has.

  According to the present invention, as a relatively simple elevator, the number of components can be reduced, and the hoistway can be reduced in size.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a configuration explanatory view showing one embodiment of a screw type elevator according to the present invention. Explanatory drawing which looked at the movable floor from the lower side using the hoistway as a cross section. The perspective view which looked at the movable floor from the upper side. The perspective view which looked at the movable floor from the lower side. FIG. 2 is a configuration explanatory diagram showing a configuration of one roller.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows an embodiment of a screw type elevator according to the present invention. This embodiment is applied, for example, as an elevator of a two-story building. The hoistway 1 in the building has a rectangular cross section and is surrounded by a wall surface 2 except for the entrance 1a. Configuration. Specifically, it has a rear wall surface 2a facing the entrance 1a, left and right wall surfaces 2b and 2c viewed from the entrance 1a, and a wall surface 2d on the entrance 1a side.

  A screw shaft 4 for raising and lowering the movable floor 3 is arranged in the hoistway 1. The screw shaft 4 is arranged at the back of the hoistway 1, that is, at a position close to the wall surface 2a and substantially at the center in the left-right direction so as to minimize the space for passengers as much as possible. (In other words, vertically). The lower end of the screw shaft 4 is connected to a driving device 6 composed of an electric motor disposed in a pit 5 below the hoistway 1. In one embodiment, the screw shaft 4 is coaxially connected to the rotor of the low-speed / high-torque electric motor as the driving device 6, but the electric motor rotates the screw shaft 4 via an appropriate reduction gear mechanism. It may be configured to be driven. It is desirable that the upper end of the screw shaft 4 be rotatably supported at a predetermined position in the hoistway 1 via a bracket (not shown).

  The screw shaft 4 extends through the movable floor 3, and a nut member 8 with which the screw shaft 4 is screwed is attached to the movable floor 3. As shown in FIGS. 2 to 4, the movable floor 3 has a shape substantially corresponding to the cross-sectional shape of the hoistway 1, and has a rectangular shape in this embodiment, and has an appropriate thickness so that the passenger stands and rides. And has a simple flat plate shape. In other words, this elevator has only a cab and has a simple structure in which a passenger stands on the movable floor 3 and gets on. Note that a simple handrail may be provided around the movable floor 3 (for example, on three sides except the entrance 1a side).

  A minimum gap required for the movable floor 3 to move within the hoistway 1 is provided between the periphery of the movable floor 3 and the wall surface 2 of the hoistway 1. The nut member 8 is fixed to the lower surface of the movable floor 3. The screw shaft 4 and the nut member 8 may be configured to have a general thread, but are desirably configured as a so-called ball screw mechanism in which both mesh with each other via a metal ball serving as a rolling element. I have. Accordingly, when the screw shaft 4 is rotationally driven by the driving device 6, the movable floor 3 moves up and down in the hoistway 1.

  A lower auxiliary nut member 9 is screwed to the screw shaft 4 below the nut member 8, and an upper auxiliary nut member 10 is similarly screwed to the screw shaft 4 above the nut member 8. The lower auxiliary nut member 9 is located on the lower side in the axial direction from the nut member 8, and is connected to the lower surface of the movable floor 3 by a pair of bar-shaped reinforcing members 11 extending obliquely in the vertical direction. . The pair of bar-shaped reinforcing members 11 are arranged so as to form a substantially V-shape in which the lower auxiliary nut member 9 becomes a vertex and expands toward the entrance / exit 1a side in a plan view (FIGS. 2, FIG. 4). The upper auxiliary nut member 10 is located on the upper side in the axial direction from the nut member 8, and is connected to the upper surface of the movable floor 3 by a pair of bar-shaped reinforcing members 12 extending obliquely in the vertical direction. The pair of bar-shaped reinforcing members 12 linearly extend from the upper auxiliary nut member 10 so as to be substantially parallel to the rear wall surface 2a in plan view (see FIG. 3). The lower auxiliary nut member 9 and the upper auxiliary nut member 10 are also screwed to the screw shaft 4 as a ball screw mechanism, and move together with the nut member 8 as the screw shaft 4 rotates. Therefore, the load of the movable floor 3 including the weight of the passenger is supported in a wide vertical range from the lower auxiliary nut member 9 to the upper auxiliary nut member 10 via the reinforcing members 11 and 12.

  A roller guide device 15 is provided at each of a pair of corners of the movable floor 3 near the entrance 1a. As shown in FIG. 2, the base plate 17 of the roller guide device 15 is attached to the lower surface of the movable floor 3. Each roller guide device 15 includes two rollers 16 that are in contact with the wall surface 2 of the hoistway 1 serving as a guide surface for the movable floor 3. More specifically, the roller guide device 15 includes a side roller 16A in contact with the left and right wall surfaces 2b and 2c of the hoistway 1, and a front roller 16B in contact with the wall surface 2d of the hoistway 1 on the side of the entrance 1a. The two rollers 16A and 16B are combined in directions different from each other by 90 °. As is apparent from FIG. 2, the two roller guide devices 15 have a configuration in which the arrangement and the like of the rollers 16A and 16B are symmetric with each other.

  These roller guide devices 15 have a configuration similar to a known roller guide device provided for a guide rail in a general elevator, and each roller 16 is mounted on a wall surface corresponding to each roller 16 with an appropriate load by a spring. We are in pressure contact. FIG. 5 is an explanatory view schematically showing the configuration of one roller 16, wherein a rotating shaft 21 that rotatably supports the roller 16 is swingably supported via a bracket (not shown). The roller 16 is urged toward the wall surface 2 by a spring 22 composed of a compression coil spring or the like. Further, an appropriate damper 23 such as a friction damper or a hydraulic damper is interposed between the roller 16 and the movable floor 3 in order to suppress the vibration caused by the spring 22.

  In this embodiment, each roller 16 of the roller guide device 15 includes a brake mechanism 25 for restricting the rotation of the roller 16. As shown schematically in FIG. 5, the brake mechanism 25 has a pair of brake arms 26 having a shoe (not shown) at the tip end intersecting via a shaft 27. At the base end, there are provided a solenoid 28 that draws the two together, and a spring 29 that urges the two so as to be separated from each other. Normally, the solenoid 28 is not excited, and the shoe at the tip of the brake arm 26 is separated from the side surface of the roller 16 (for example, the side surface of the rim) by the spring force of the spring 29. Therefore, the roller 16 rotates freely. Then, when some kind of braking is required, such as at the time of overspeed, the solenoid 28 is excited. As a result, the base ends of the brake arm 26 are pulled toward each other against the spring force of the spring 29, and a pair of shoes at the tip of the brake arm 26 are pressed against both sides so as to sandwich the roller 16, and the rotation of the roller 16 is stopped. A limiting braking action is obtained.

  For example, when the movable floor 3 is overspeeded due to some abnormality, the friction between the movable wall 3 and the wall surface 2 is increased by limiting the rotation of the roller 16 by the brake mechanism 25, and the movable floor 3 Be braked. Note that an actuator that presses the roller 16 more strongly against the wall surface 2 in conjunction with the brake mechanism 25 during braking may be provided.

  As shown in FIG. 1, the entrance 1 a of the hoistway 1 is provided with a landing door 31 that is opened and closed by an upper door operator device 30. The door operator device 30 has a general configuration using an electric motor and wires (both not shown). The sill portion 32 at the lower edge of the entrance 1a is provided with a position detection sensor 33 for detecting that the movable floor 3 has reached a predetermined height position (a position substantially aligned with the floor of the landing). The landing door 31 is controlled to open and close based on the signal of the detection sensor 33.

  In the screw-type elevator configured as described above, the movable floor 3 on which a passenger stands and does not have a car (cab) or a guide rail is supported by a screw shaft 4 and the screw shaft 4 Ascends and descends with the rotation of. Then, since the rollers 16 of the pair of roller guide devices 15 disposed at the corners of the movable floor 3 are pressed against the wall surfaces 2 around the hoistway 1, the periphery of the hoistway 1 is raised when the movable floor 3 is raised and lowered. The wall surface 2 functions as a substantial guide surface, and suppresses left and right vibrations of the movable floor 3.

  For example, when the screw shaft 4 rotates clockwise in FIG. 2, the entire movable floor 3 also tries to rotate clockwise around the screw shaft 4. At this time, the side roller 16A of the one roller guide device 15 on the wall surface 2c side approaches the wall surface 2c, and the side roller 16A of the other roller guide device 15 on the wall surface 2b side is separated from the wall surface 2b. Similarly, the front roller 16B of one roller guide device 15 on the wall surface 2c side is separated from the wall surface 2d, and the front roller 16B of the other roller guide device 15 on the wall surface 2b side approaches the wall surface 2d. Therefore, the load of each spring 22 has an effect of returning the movable floor 3 to the neutral position against the rotational torque. The same applies to the case where the screw shaft 4 rotates in the counterclockwise direction in FIG. 2, and the movable floor 3 is returned to the neutral position against the rotation torque in the counterclockwise direction around the screw shaft 4. Action occurs.

  Therefore, when the screw shaft 4 is moved up and down by the rotational drive, the movable floor 3 goes up and down smoothly without largely swinging left and right. Here, since the roller guide device 15 is disposed at a corner portion farthest from the screw shaft 4 that is the center of the rotational torque, the roller guide device 15 effectively suppresses the left and right vibrations of the movable floor 3 about the screw shaft 4. Can be suppressed. For example, a step or the like due to a joint of panels on the wall surface 2 of the hoistway 1 can be gently overcome, and the left and right swing due to the step is suppressed.

  As described above, according to the screw-type elevator, since the movable floor 3 is guided by the wall surface 2 of the hoistway 1 without a cab or a guide rail, the number of parts is small, and a relatively low-rise In addition to being able to be installed in a building at low cost, the required cross-sectional area of the hoistway 1 is reduced, and a small elevator can be provided.

  Although not shown in detail, each roller 16 of the roller guide device 15 is provided with a so-called active suspension type suspension mechanism capable of actively variably controlling the position of the roller 16, and an acceleration sensor is provided on the movable floor 3 side. Thus, a configuration may be employed in which the suspension mechanism of each roller 16 generates a force that cancels the vibration of the movable floor 3. According to such an active suspension type configuration, although the configuration is complicated, it is possible to more effectively suppress the vibration of the movable floor 3.

  Further, in the above embodiment, the entrance 1a of each floor is provided on one wall surface 2d of the hoistway 1, but the entrance 1a on the first floor is connected to the movable floor 3 so that the passenger enters and exits in an L shape. The present invention can also be configured as an elevator in which the entrance 1a on the second floor is arranged in a different direction. For example, the entrance / exit 1a on the first floor can be provided on the wall surface 2d, and the entrance / exit 1a on the second floor can be provided on any of the left and right wall surfaces 2b and 2c.

DESCRIPTION OF SYMBOLS 1 ... Hoistway 2 ... Wall surface 3 ... Movable floor 4 ... Screw shaft 6 ... Drive device 8 ... Nut member 9 ... Lower auxiliary nut member 10 ... Upper auxiliary nut member 11, 12 ... Reinforcement material 15 ... Roller guide device 16 ... Roller 22 spring 23 damper 25 brake mechanism

Claims (4)

A hoistway surrounded by walls,
A screw shaft arranged at a position offset to one of the cross sections of the hoistway, and extending parallel to the hoistway,
A driving device that rotationally drives the screw shaft,
A movable floor having a nut member with which the screw shaft is screwed, and through which the screw shaft passes,
A pair of roller guides each having two rollers, which are provided at a pair of corner portions of the movable floor opposite to the screw shaft and which are in contact with two adjacent wall surfaces by 90 ° different directions, respectively. Equipment and
An upper auxiliary nut member that is axially separated from the nut member and is screwed with the screw shaft;
A lower auxiliary nut member that is axially separated from the nut member and is screwed with the screw shaft;
A pair of bar-shaped reinforcing members connecting the upper auxiliary nut member to the upper surface of the movable floor,
A pair of bar-shaped reinforcing members that connect the lower auxiliary nut member to the lower surface of the movable floor and are arranged so as to be substantially V-shaped in plan view;
A screw-type elevator comprising:   The said roller is provided with the brake mechanism, The screw type elevator of Claim 1 characterized by the above-mentioned. The screw shaft is arranged close to a rear wall surface facing the entrance of the hoistway,
The screw-type elevator according to claim 1, wherein the roller guide device is disposed at a pair of corners of the movable floor near the entrance. The pair of bar-shaped reinforcing members connecting the upper auxiliary nut member to the movable floor, extend in a straight line so as to be parallel to a wall surface on the screw shaft side of the hoistway in plan view. The screw type elevator according to any one of claims 1 to 3, wherein:

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