JP5237695B2 - Elevator equipment - Google Patents

Description

  The present invention relates to an elevator apparatus that has a multistage cylinder and lifts and lowers an elevator car with a hydraulic jack that can be vertically expanded and contracted.

2. Description of the Related Art Conventionally, there is known an elevator apparatus that has a multistage cylinder and raises and lowers an elevator car using a hydraulic jack that can be vertically expanded and contracted (see, for example, Patent Document 1). In this case, a hydraulic jack for raising and lowering an elevator car is installed on the floor of the elevator hoistway, and a guide rail for guiding the raising and lowering of the elevator car is arranged on the side of the hydraulic jack. The hydraulic jack is one in which a multistage cylinder arranged in a nested manner is extended or contracted upward from the main body of the hydraulic jack 1 installed on the floor surface, and thereby the elevator car moves up and down.
JP-A-7-309550

  By the way, in such an elevator apparatus, the hydraulic oil moves into each cylinder, so that the cylinder inside the cylinder protrudes and extends from the cylinder, and the hydraulic oil moves out of each cylinder. On the other hand, the inner cylinders are immersed and contracted, and the strokes of the cylinders protruding from the outer cylinders are set to be equal for the cylinders.

  However, while the hydraulic jack repeatedly expands and contracts, the cylinder strokes are displaced. If the displacement of the stroke of each cylinder is left unattended, the cylinder with a shorter stroke than the strokes of the other cylinders will be housed in the outer cylinder when the elevator car descends to the lowest floor and will be fully contracted. There is a risk of collision, and safety cannot be ensured, and the durability of the hydraulic jack is affected, resulting in a short life.

  The present invention has been made in view of the above points, and an object of the present invention is to provide an elevator apparatus that can reset the displacement of the stroke of each cylinder of the hydraulic jack.

In order to solve the above-mentioned problem, in the invention according to claim 1 , the shaft portion 81 and the head portion 82 are provided at the tip of the hydraulic jack 1 which has a multistage cylinder (11, 13, 15) and can be vertically expanded and contracted. The jack stroke member 8 is provided, the stroke hole 40 through which the shaft portion 81 of the jack stroke member 8 is inserted is provided in the platform 4 to which the elevator car 2 is fixed , and the platform 4 is supported by the tip end portion of the hydraulic jack 1. And a hydraulic unit 5 for supplying hydraulic oil to the hydraulic jack 1 to move the platform 4 up and down, and restricting and buffering further downward movement of the platform 4 at a position below the stop position on the lowest floor. It includes a damper 66 that performs, each cylinder of the hydraulic jack 1 by causing contact with the shock absorber 66 lowers the platform 4 (11,13,1 Stroke A of), B, is to characterized in that it comprises a reset mode for resetting the C.

  According to the first aspect of the present invention, the displacement of the stroke of each cylinder can be reset, and the cylinder with the shortened stroke is prevented from colliding with the bottom of the outer cylinder to ensure safety. At the same time, the durability of the hydraulic jack can be improved and the life can be extended.

Further, even when the hydraulic jack is not contracted to the limit even when the platform is in contact with the shock absorber, the stroke deviation of each cylinder can be completely reset by contracting the hydraulic jack to the limit.

  Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings.

  The elevator apparatus 6 of the present invention is as shown in FIG. 2, and the elevator car 2 is disposed in an elevator hoistway 60 formed over the upper and lower floors in a building so as to be movable up and down. In the embodiment shown in the accompanying drawings, a driving device 50 including a hydraulic unit 5 and a hydraulic jack 1 for driving the elevator car 2 to move up and down is provided at the bottom of the elevator hoistway 60. A stand 61 is fixed to the bottom of the elevator hoistway 60, and a pair of guide rails 62 are erected on the stand 61, and the stand 61 extends and contracts as a component of the driving device 50. The lower end portion of the free hydraulic jack 1 is fixed. An elevator car 2 (more precisely, a platform 4 described later) is attached to the upper end of the rod of the hydraulic jack 1 that can be extended and contracted. In the embodiment shown in the accompanying drawings, the elevator car 2 comprises an upper end portion of the hydraulic jack 1 (an L-shaped platform 4 fixed to a piston rod, which will be described later), and a car portion 20 mounted on the platform 4. A guide (not shown) is provided on the platform 4 of the elevator car 2 and is slidably fitted into the guide rail 62.

  Reference numeral 63 in FIG. 2 denotes a control unit including a microcomputer 63a, which is provided in the elevator car 2 in the embodiment shown in the accompanying drawings, but may be provided on the building side. The elevator unit 2 is moved up and down in the elevator hoistway 60 by the hydraulic unit 5 being controlled by the microcomputer 63a provided in the control unit 63 and the rod of the hydraulic jack 1 extending and contracting.

  Each floor of the elevator hoistway 60 is provided with a detection unit 65 (not shown) on the building side, and the elevator car 2 detects the detection unit 65 provided on each floor to detect the position of the elevator car 2. A car-side detector 65 for detection is provided.

  In addition, a buffer 66 that abuts on the platform 4 is provided in order to restrict and buffer the elevator car 2 from further downward movement at a position below the stop position on the lowest floor.

  Next, the hydraulic jack 1 will be described. As shown in FIG. 3, the hydraulic jack 1 has multi-stage cylinders (11, 13, and 15 to be described later). It has become.

  The first cylinder 11 has a vertically long cylinder shape having an upper lid and a bottom portion, and is provided so that a first piston 12 having substantially the same shape as the plane cross-sectional shape of the internal space can be moved up and down. . A port 11a is formed at the lower end of the first cylinder 11 to allow the hydraulic oil for raising the first piston 12 to flow into the first cylinder 11, and this port 11a is connected to the hydraulic unit 5 via a pipe. Connected. A second cylinder 13 having an outer diameter smaller than the diameter of the first piston 12 (that is, the inner diameter of the first cylinder 11) extends from the upper surface of the first piston 12.

  The second cylinder 13 has a long cylindrical shape with an upper lid and is inserted upward through an insertion port 11b having an inner diameter substantially the same as the outer diameter of the second cylinder 13 opened in the upper lid of the first cylinder 11. It protrudes freely. The inside of the second cylinder 13 (that is, the portion surrounded by the second cylinder 13 and the first piston 12) becomes a sealed space. In the second cylinder 13, a second piston 14 having substantially the same shape as the plane cross-sectional shape of the internal space is provided so as to be movable up and down. At the lower end of the second cylinder 13, a port 13 a for allowing hydraulic oil that raises the second piston 14 to flow into the second cylinder 13 is formed. The hydraulic oil in the space inside the first cylinder 11 outside the second cylinder 13 is raised outside the second cylinder 13 by the first piston 12 rising, and the volume of the space inside the first cylinder 11 is reduced. Accordingly, the gas flows into the second cylinder 13 through the port 13 a and pushes the second piston 14 upward relative to the second cylinder 13. A third cylinder 15 having an outer diameter smaller than the diameter of the second piston 14 (that is, the inner diameter of the second cylinder 13) extends from the upper surface of the second piston 14.

  The third cylinder 15 has an upper and lower long cylindrical shape, and is inserted upward through an insertion port 13b having an inner diameter substantially the same as the outer diameter of the third cylinder 15 opened in the upper cover of the second cylinder 13. It protrudes freely. The inside of the third cylinder 15 (that is, the portion surrounded by the third cylinder 15 and the second piston 14) becomes a sealed space. Further, in the third cylinder 15, a third piston 16 having substantially the same shape as the plane cross section of the internal space is provided so as to be movable up and down. At the lower end of the third cylinder 15, a port 15 a for allowing hydraulic oil that raises the third piston 16 to flow into the third cylinder 15 is formed. The hydraulic oil outside the third cylinder 15 and in the space inside the second cylinder 13 is raised outside the third cylinder 15 by raising the second piston 14 and the volume of the space inside the second cylinder 13 is reduced. Accordingly, the gas flows into the third cylinder 15 through the port 15 a and pushes the third piston 16 upward relative to the third cylinder 15. A piston rod 17 extends from the upper surface of the third piston 16, and the piston rod 17 has an insertion port 15b having an inner diameter substantially the same as the outer diameter of the piston rod 17 opened in the upper lid of the third cylinder 15. It is inserted and protrudes upward and downward. As shown in FIG. 4, the upper end of the piston rod 17 is fixed to the platform 4 with bolts or the like.

  In such an elevator apparatus 6, the hydraulic jack 1 is installed at the bottom of the elevator hoistway 60, and the upper end of the upper and lower movable ranges of the upper end of the hydraulic jack 1 (that is, the upper end of the piston rod 17). The normal operating range is set with some margin at the lower end.

  As shown in FIG. 1, the distance from the lower end of the movable range of the second cylinder 13 relative to the first cylinder 11 (hereinafter referred to as stroke) is A, the stroke of the third cylinder 15 relative to the second cylinder 13 is B, and the piston rod 17 Let C be the stroke of the third cylinder 15. The strokes A, B, and C of the second cylinder 13, the third cylinder 15, and the piston rod 17 are preferably equal as shown in FIG. 1A, and A = B = C is set as an initial setting. .

  However, as the hydraulic jack 1 repeats the expansion and contraction of the second cylinder 13, the third cylinder 15, and the piston rod 17 by using the elevator, as shown in FIG. Misalignment will occur.

  Therefore, in the present invention, in order to reset the deviation of each stroke A, B, C, the platform 4 is lowered below the normal operating range, that is, the position of the lowest floor shown in FIG. As shown in c), it is brought into contact with the shock absorber 66. Accordingly, the hydraulic jack 1 can be contracted to the limit or close to the limit, and the second cylinder 13, the third cylinder 15, and the piston rod 17 can be moved relative to the first cylinder 11, the second cylinder 13, and the third cylinder 15, respectively. The strokes A, B, and C can be forcibly positioned at or near 0 and can be reset to a state without deviation, and a reset mode for performing the above operation is executed by the control unit 63.

  In order to perform the resetting, an operation unit (not shown) having a push button or the like is operated to cause the control unit 63 to perform the reset mode, or the control unit 63 automatically performs the reset mode periodically. Alternatively, the reset mode may be automatically performed when some condition is satisfied.

  At this time, the hydraulic jack 1 may be further contracted from the state in which the platform 4 is in contact with the shock absorber 66. As shown in FIG. 5, the jack stroke member 8 having a shaft portion 81 and a head portion 82 is provided at the tip of the hydraulic jack 1, and the stroke in which the shaft portion 81 of the jack stroke member 8 is inserted into the platform 4. The hole 40 is provided.

  When the platform 4 is in the normal driving range, it is supported at the tip of the hydraulic jack 1 as shown in FIG. 5A, but when the platform 4 comes into contact with the shock absorber 66, FIG. As shown in FIG. 2, the platform 4 is supported by the shock absorber 66, and the second cylinder 13, the third cylinder 15 and the piston rod 17 of the hydraulic jack 1 are further contracted by their own weight and lowered to the lowest end of the movable range.

  Even if the platform 4 abuts against the shock absorber 66, the hydraulic jack 1 may not yet contract to the limit. However, with the above configuration, the hydraulic jack 1 can be contracted to the limit, and the second The strokes A, B, and C of the cylinder 13, the third cylinder 15, and the piston rod 17 with respect to the first cylinder 11, the second cylinder 13, and the third cylinder 15 can be reliably reset to zero.

(A) (b) (c) is explanatory drawing of the hydraulic jack of the elevator apparatus of one Embodiment of this invention. It is a whole perspective view of the elevator apparatus of embodiment same as the above. It is a schematic sectional drawing of the hydraulic jack of embodiment same as the above. It is a sectional side view explaining connection with the hydraulic jack of an embodiment same as the above, and a platform. (A) and (b) are the side views explaining other examples of connection of a hydraulic jack and a platform.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hydraulic jack 11 1st cylinder 13 2nd cylinder 15 3rd cylinder 17 Piston rod 2 Elevator car 4 Platform 5 Hydraulic unit 60 Elevator hoistway 66 Shock absorber

Claims (1)

For strokes where the shaft of the jack stroke member is inserted into the platform to which the elevator car is fixed by providing a multi-stage cylinder jack that has a shaft and a head at the tip of a hydraulic jack that can be vertically expanded and contracted . Provided with a hydraulic unit that provides a hole, supports the platform at the tip of the hydraulic jack, and supplies hydraulic oil to the hydraulic jack to raise and lower the platform, at a position below the stop position on the lowest floor, more than that of the platform Characterized in that it comprises a shock absorber that regulates the downward movement of the cylinder and performs buffering, and a reset mode that resets the stroke of each cylinder of the hydraulic jack by lowering the platform and bringing it into contact with the shock absorber. Elevator equipment.

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