JP2013139304A - Hydraulic elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hydraulic elevator that can stop a car in a safer manner on the occurrence of contingencies.SOLUTION: A hydraulic elevator 10 includes a hydraulic oil tank 36 for storing hydraulic oil; a cylinder 30 into which a lower end of a plunger 32 is inserted so that the plunger 32 is operable to be lifted and lowered; hydraulic oil piping 41 for making the hydraulic oil tank 36 communicate to the cylinder 30; and a hydraulic oil pump 38 installed to the hydraulic oil piping 41 to feed the hydraulic oil to the cylinder 30 from the hydraulic oil tank 36 so as to allow a car 14 to be lifted and lowered by feeding or discharging the hydraulic oil to the inside of the cylinder 30. The hydraulic elevator further includes a hydraulic system control panel 52 for controlling the plunger 32 to stop the lifting and lowering operation thereof when the operation of the car 14 is in a failure state.

Description

  The present invention relates to a hydraulic elevator.

  Currently, various elevators are installed in various places. One type of elevator is a hydraulic elevator that uses hydraulic pressure to raise and lower a car. As a technique related to the present invention, a hydraulic jack is erected in a projection space from above between a side surface of a car installed in a hoistway so as to be movable up and down and an inner wall of the hoistway, and one end of the hoistway is arranged on the hoistway. The intermediate part of the rope fixed to the inner bottom and the other end fixed to the car side is wrapped around the plunger sheave provided at the tip of the plunger of the hydraulic jack, and the plunger is moved up and down by the hydraulic jack, via the rope. There has been disclosed an elevator facility in which a hydraulic elevator for raising and lowering a car is renewed to a rope type elevator using a hoisting machine with a hydraulic jack remaining in the hoistway.

JP2011-68435A

  In a hydraulic elevator, when an unexpected defect occurs in a mechanism or the like for raising and lowering the car, it is required that the car is stopped more safely.

  An object of the present invention is to provide a hydraulic elevator that can stop a car more safely when an unexpected situation occurs.

  A hydraulic elevator according to the present invention communicates a hydraulic oil tank that stores hydraulic oil, a cylinder in which a lower end of the plunger is inserted so that the plunger can be moved up and down, and the hydraulic oil tank and the cylinder. A hydraulic oil pipe, a hydraulic oil pump provided in the hydraulic oil pipe for supplying the hydraulic oil from the hydraulic oil tank to the cylinder, and supply or discharge of the hydraulic oil to the inside of the cylinder, A hydraulic elevator that raises and lowers a car, and includes a control unit that performs control to stop the raising and lowering operation of the plunger when the operation of the car is abnormal.

  In the hydraulic elevator according to the present invention, it is preferable that the control unit closes a valve provided in a portion of the hydraulic oil pipe that is closest to the cylinder.

  In the hydraulic elevator according to the present invention, it is preferable that the control unit controls a brake mechanism that stops the operation of the plunger.

  In the hydraulic elevator according to the present invention, it is preferable that the abnormal state is a state in which the door of the car is opened and a state where the door protrudes from a predetermined door zone.

  In the hydraulic elevator according to the present invention, it is preferable that the abnormal state is a state in which the door of the car is opened and the car is lowered by a predetermined distance or more in a predetermined unit time.

  According to the present invention, the car can be stopped more safely when an unexpected situation occurs.

In embodiment which concerns on this invention, it is a figure which shows schematic structure of a hydraulic elevator. In embodiment which concerns on this invention, when the operation | movement of a car is an abnormal state, it is a flowchart which shows the procedure which stops the raising / lowering operation | movement of a plunger. In embodiment which concerns on this invention, it is a figure which shows schematic structure of a hydraulic elevator. In embodiment which concerns on this invention, when the operation | movement of a car is an abnormal state, it is a flowchart which shows the procedure which stops the raising / lowering operation | movement of a plunger.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. Also, in the following, in all the drawings, the same symbols are attached to the same elements, and the duplicate description is omitted. In the description in the text, the symbols described before are used as necessary.

  FIG. 1 is a diagram illustrating a schematic configuration of a hydraulic elevator 10. The hydraulic elevator 10 has a car 14 that moves up and down in a hoistway 12 that is a space extending in a vertical direction in a building. The car 14 is provided with a car door 20 on a side wall portion facing a hall door 18 installed in the elevator hall 16 of the building.

  A plate-shaped or frame-shaped rope stopper 22 for supporting the car 14 is provided at the lower part of the car 14. For example, each end portion of a plurality of main ropes 24 made of wire is connected and fixed to the rope stopper 22. In FIG. 1, the main rope 24 is indicated by a single solid line, but the plurality of main ropes 24 are arranged side by side in the depth direction of FIG. 1.

  A hydraulic jack 28 is erected on the bottom 26 of the hoistway 12. The hydraulic jack 28 includes a cylindrical cylinder 30 and a plunger 32 whose lower end is inserted into the cylinder 30 and protrudes upward from the upper end of the cylinder 30. A packing 35 is attached to the upper end portion side of the cylinder 30 so that no gap is formed between the plunger 32 and the inner wall of the cylinder 30.

  Further, in the machine chamber 34 provided adjacent to the hoistway 12, there are a hydraulic oil tank 36 for storing hydraulic oil and a hydraulic oil pump 38 for supplying hydraulic oil from the hydraulic oil tank 36 into the cylinder 30 at a high pressure. is set up. The hydraulic oil pipe 41 is provided so that the hydraulic oil pump 38 and the lower part of the cylinder 30 communicate with each other, and the cylinder 30 side is a single pipe. However, as shown in FIG. It is branched into two pipes, one pipe and one on the discharge side. In the hydraulic oil pipe 41, an oil supply solenoid valve 40 is arranged in a supply-side pipe for supplying hydraulic oil from the hydraulic oil tank 39 to the cylinder 30. Further, in the hydraulic oil pipe 41, a drain-side electromagnetic valve 42 is arranged on the supply side pipe for returning the hydraulic oil discharged from the cylinder 30 to the hydraulic oil tank 36.

  A pulley 44 is rotatably attached to an upper end portion of the plunger 32 of the hydraulic jack 28, and the pulley 44 moves up and down along a jack rail 29 erected adjacent to the hydraulic jack 28.

  One end of the main rope 24 is connected and fixed to the bottom 26 of the hoistway 12 via a rope elongation corrector 50, and is wound around the upper side of the pulley 44. Then, the other end is connected and fixed to the rope stopper 22 of the car 14. The rope elongation corrector 50 is an instrument for adjusting the elongation of the main rope 24.

  The machine room 34 is provided with a hydraulic control panel 52 as control means. The hydraulic control panel 52 has a function of executing overall control over the entire hydraulic elevator 10, and includes a CPU that executes a control program, a ROM that stores control programs and control parameter threshold values in advance, measurement data, and the like. It includes a RAM that can be temporarily stored and read out as needed.

  Here, in the hydraulic elevator 10, the oil supply solenoid valve 40 is opened in a state where the oil discharge solenoid valve 42 is closed, and the hydraulic oil is pressurized from the hydraulic oil tank 36 into the cylinder 30 by the hydraulic oil pump 38. The plunger 32 is pushed upward by being fed in. As a result, the pulley 44 provided at the upper end of the plunger 32 moves upward, whereby the car 14 is pulled up via the main rope 24 and moved upward. At this time, the moving amount of the car 14 is doubled with respect to the moving amount of the pulley 44, that is, the plunger 32 from the principle of the moving pulley.

  When the car 14 reaches the elevator hall 16 on the uppermost floor, the pressure receiving portion 33 at the lower end of the plunger 32 is substantially at the uppermost position in the cylinder 30. At this time, it is designed so that a margin for further pushing up the plunger 32 remains between the uppermost portion 31 in the cylinder 30 and the pressure receiving portion 33.

  On the other hand, when the car 14 moves downward, the oil discharge solenoid valve 42 is opened with the oil supply solenoid valve 40 closed. As a result, the plunger 32 is pushed down by the gravitational action caused by the weight of the car 14 or the like, so that the hydraulic oil in the cylinder 30 returns to the hydraulic oil tank 36 via the draining electromagnetic valve 42. Then, the opening degree of the oil draining electromagnetic valve 42 is gradually reduced to gradually reduce the descending speed of the car 14, and when the valve is completely closed, the descending movement of the plunger 32 and the car 14 is stopped. Land on the designated floor registered for the destination floor in the car.

  Here, in the hydraulic elevator 10, the electromagnetic brake 60, the electromagnetic valve 62, the door zone detection unit 64, and the hydraulic control panel 52 have features, and these elements will be described in detail below.

  The electromagnetic brake 60 is provided in the vicinity of the uppermost portion 31 in the cylinder 30, and a brake portion 60 a having a shape that follows the outer shape of the plunger 32 is applied to the plunger 32 using electromagnetic force under the control of the hydraulic control panel 52. It has a function of mechanically stopping the lifting / lowering operation of the plunger 32 by making contact in a pressurized state.

  The electromagnetic valve 62 is a valve that is attached to a position closest to the cylinder 30 in the hydraulic oil pipe 41 and opens and closes under the control of the hydraulic control panel 52.

  The door zone detection unit 64 is a sensor that is provided below the landing door 18 and determines whether or not the lower part of the car 14 protrudes from the door zone when the car 14 reaches the floor. The door zone detector 64 includes a sensor that can measure the distance to the bottom of the car 14, and includes an infrared sensor, for example. Here, in the door zone, when the car 14 is landed and the car door 20 and the hall door 18 are open, the level difference between the floor of the elevator hall 16 and the floor of the car 14 is less than an allowable value. As described above, the region is set with respect to the lower position of the car 14.

  The hydraulic control panel 52 has a function of performing opening / closing control of the car door 20 and the landing door 18. For this reason, the hydraulic control panel 52 recognizes the open / closed state of the car door 20 and the landing door 18. The hydraulic control panel 52 has a function of determining whether or not the lower portion of the car 14 protrudes from the door zone based on information acquired from the door zone detection unit 64.

  The hydraulic control panel 52 closes the electromagnetic valve 62 when it is determined that the car door 20 is open and the lower part of the car 14 protrudes from the door zone. Further, the hydraulic control panel 52 generates an electromagnetic force in the electromagnetic brake 60 and uses the electromagnetic force to bring the brake portion 60a along the outer shape of the plunger 32 into contact with the plunger 32 in a pressurized state. The raising / lowering operation of the plunger 32 is mechanically stopped.

  Next, the operation of the hydraulic elevator 10 having the above configuration will be described with reference to FIG. FIG. 2 is a flowchart showing a procedure for stopping the lifting / lowering operation of the plunger 32 when the operation of the car 14 is abnormal in the hydraulic elevator 10.

  First, it is determined whether or not the lower part of the car 14 protrudes from the door zone (S2). If it is determined in step S2 that the lower part of the car 14 does not protrude from the door zone, the process proceeds to return processing.

  If it is determined in step S2 that the lower portion of the car 14 is protruding from the door zone, it is determined whether or not the car door 20 remains open (S4). If it is determined in step S4 that the car door 20 is not open, the process proceeds to return processing.

  If it is determined in step S4 that the car door 20 remains open, control is performed to close the solenoid valve 62 (S6). After the step S6, the electromagnetic brake 60 is controlled so as to stop the raising / lowering operation of the plunger 32 (S8). After S8, the process proceeds to return processing.

  As described above, according to the hydraulic elevator 10, the operation of the car 14 is abnormal when the lower part of the car 14 protrudes from the door zone and the car door 20 remains open. Judged to be in a state. At this time, the lifting / lowering operation of the plunger 32 is stopped by stopping the flow of the hydraulic oil by closing the electromagnetic valve 62, and the lifting / lowering operation of the plunger 32 is stopped by the brake by the electromagnetic brake 60. Thereby, even if a part of the hydraulic oil pipe 41 is broken and hydraulic oil may flow out, at least the electromagnetic valve 62 can safely stop the car 14. Even if the packing 35 provided on the uppermost part 31 of the cylinder 30 is damaged and hydraulic oil may flow out, at least the electromagnetic brake 60 can safely stop the car 14. .

  Next, a hydraulic elevator 11 that is a modification of the hydraulic elevator 10 will be described. FIG. 3 is a diagram showing a schematic configuration of the hydraulic elevator 11. The difference between the hydraulic elevator 11 and the hydraulic elevator 10 is the point that an oil amount sensor 66 is provided instead of the door zone detection unit 64 and the function of the hydraulic control panel 52. explain.

  The oil amount sensor 66 is provided in the hydraulic oil tank 36 and detects the amount of oil in the hydraulic oil tank 36 by measuring the distance to the oil surface using infrared rays, ultrasonic waves, or the like. The detected value is transmitted to the hydraulic control panel 52.

  The hydraulic control panel 52 recognizes the open / closed state of the car door 20 and the landing door 18 as described above. Further, the hydraulic control panel 52 can calculate the descending distance of the car 14 per unit time based on the information acquired from the oil amount sensor 66.

  The hydraulic control panel 52 closes the electromagnetic valve 62 when it is determined that the car door 20 is open and the car 14 is lowered by 1 m or more per minute. At this time, the hydraulic control panel 52 generates an electromagnetic force in the electromagnetic brake 60, and uses the electromagnetic force to bring the brake portion 60a along the outer shape of the plunger 32 into contact with the plunger 32 in a pressurized state. Thus, the raising / lowering operation of the plunger 32 is mechanically stopped. Here, the criterion for determination is that the car 14 is lowered by 1 m or more per minute, but these numbers can be changed as appropriate.

  Next, the operation of the hydraulic elevator 11 having the above configuration will be described with reference to FIG. FIG. 4 is a flowchart showing a procedure for stopping the lifting / lowering operation of the plunger 32 when the operation of the car 14 is abnormal in the hydraulic elevator 11.

  First, it is determined whether or not the car 14 is lowered by 1 m or more per minute (S12). If it is determined in step S12 that the car 14 is not lowered by 1 m or more per minute, the process proceeds to return processing.

  If it is determined in step S12 that the car 14 is lowered by 1 m or more per minute, it is determined whether or not the car door 20 remains open (S14). If it is determined in step S14 that the car door 20 is not open, the process proceeds to return processing.

  If it is determined in step S14 that the car door 20 remains open, control is performed to close the electromagnetic valve 62 (S16). After the step of S16, the electromagnetic brake 60 is controlled so as to stop the raising / lowering operation of the plunger 32 (S18). After S18, the process proceeds to return processing.

  As described above, according to the hydraulic elevator 11, when the car 14 is lowered by 1 m or more per minute and the car door 20 remains open, the operation of the car 14 Is determined to be in an abnormal state. At this time, the lifting / lowering operation of the plunger 32 is stopped by stopping the flow of the hydraulic oil by closing the electromagnetic valve 62, and the lifting / lowering operation of the plunger 32 is stopped by the brake by the electromagnetic brake 60. Thus, the hydraulic elevator 11 has the same effect as the hydraulic elevator 10.

  10, 11 Hydraulic elevator, 12 hoistway, 14 passenger car, 16 elevator hall, 18 landing door, 20 passenger door, 22 rope stop, 24 main rope, 26 bottom, 28 hydraulic jack, 29 jack rail, 30 Cylinder, 31 uppermost part, 32 plunger, 33 pressure receiving part, 34 machine room, 35 packing, 36 hydraulic oil tank, 38 hydraulic oil pump, 39 hydraulic oil tank, 40 oil supply solenoid valve, 41 hydraulic oil piping, 41 for hydraulic oil Piping, 42 Oil draining solenoid valve, 44 pulley, 50 rope stretch compensator, 52 hydraulic control panel, 60 electromagnetic brake, 60a brake part, 62 solenoid valve, 64 door zone detection part, 66 oil quantity sensor.

Claims (5)

A hydraulic oil tank for storing hydraulic oil;
A cylinder in which the lower end of the plunger is inserted so that the plunger can be raised and lowered;
A hydraulic oil pipe communicating the hydraulic oil tank and the cylinder;
A hydraulic oil pump provided in the hydraulic oil pipe for supplying the hydraulic oil from the hydraulic oil tank to the cylinder;
A hydraulic elevator that raises and lowers a car by supplying or discharging the hydraulic oil to the inside of the cylinder,
A hydraulic elevator, comprising: a control unit that performs control to stop the lifting and lowering operation of the plunger when the operation of the car is in an abnormal state. The hydraulic elevator according to claim 1,
The controller is
A hydraulic elevator that closes a valve provided in a portion of the hydraulic oil pipe closest to the cylinder. The hydraulic elevator according to claim 1 or 2,
The controller is
A hydraulic elevator that controls a brake mechanism that stops the operation of the plunger. In the hydraulic elevator according to any one of claims 1 to 3,
The abnormal state is
A hydraulic elevator characterized in that the door of the car is in a state of being opened and protruding from a predetermined door zone. In the hydraulic elevator according to any one of claims 1 to 3,
The abnormal state is
A hydraulic elevator characterized in that the door of the car is opened and the car is lowered for a predetermined distance in a predetermined unit time.

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