JP2009102149A - Lifting device using hydraulic cylinder and emergency controlling method in the lifting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lifting device using a hydraulic cylinder safely stopping/descending by detecting the occurrence of a trouble, and also to provide an emergency controlling method in the lifting device. <P>SOLUTION: The lifting device uses the hydraulic cylinder comprising: a common frame 17; a pair of right and left hydraulic cylinders 4b, 4a raised along struts 9a, 9b to make rod sides upward; a pair of right and left sheaves 22b, 22a fixed at rod tip ends of the pair of the right and left hydraulic cylinders 4b, 4a; an electric hydraulic pump 5 fixed in the common frame 17; hydraulic pipes 6a, 6b, 38a, 38b, 39a, 39b supplying hydraulic oil from the electric hydraulic pump 5 to head sides and rod sides of the pair of the hydraulic cylinders 4b, 4a through a control valve 7 and a relay block 24; and cables 27a, 27b fixed to a lifting element 2 through the pair of the right and left sheave 22b, 22a at the other ends. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a lifting device having a lifting height of about 10 m, for example, a step eliminator, a lifting device using a hydraulic cylinder that is useful when applied to a cargo handling elevator, a commercial elevator, a home elevator, etc. in a three-dimensional warehouse, and an emergency in the lifting device With regard to the control method, in particular, no machine room is required, installation space is small, construction is simple, design flexibility is high, and even when a failure occurs, it can be stopped and lowered safely in response to the occurrence of the failure. An emergency control mechanism is provided.

  Various lifting devices are roughly classified into a hydraulic lifting device using a hydraulic cylinder and an electrical lifting device using a hoisting machine. Compared with electrical lifts, hydraulic lifts are (1) the machine room can be installed at any position, (2) can be lowered manually even in the event of a power failure, and (3) a load is applied by a cylinder. It has advantages such as being able to handle large loads without affecting the strength of the building, but on the other hand, (a) it has a large driving power, and (b) it cannot move up and down at high speed (generally about 60m / min) ), (C) Due to the buckling strength of the hydraulic cylinder, there are also disadvantages such as that the elevation height cannot be made too high.

  In addition, the hydraulic lifting device is a direct drive type in which a hydraulic cylinder is directly connected to a lifting body, and a rope such as a chain with one end fixed to the lifting body and the other end fixed to a building structure via a sheave. It is roughly divided into an indirect drive type that moves up and down with a hydraulic cylinder. The indirect drive type has advantages over the direct drive type in that it does not require pit construction or the like for burying the hydraulic cylinder in the ground and can be easily retrofitted to an existing building. For this reason, the indirect drive type is often used for passengers with relatively light loads and high speeds, and for people carrying both humans and luggage. A direct drive type is often adopted for luggage.

  When designing, manufacturing and installing these various elevators, they must conform to the technical standards established by the government from the viewpoint of ensuring safety. Since the required specifications of elevators differ depending on the installation location and usage conditions, even in the lifting device using hydraulic cylinders, hydraulic cylinders that are hydraulic sources and drive units that meet the technical standards of elevators for each elevator currently, Necessary equipment such as hydraulic control valves, hydraulic piping, and safety devices must be designed and configured each time.

Therefore, in order to simplify the installation work and low cost of the hydraulic elevators in low houses, an elevator box that is guided by rails and moves up and down is installed in a unitized frame assembly, and the upper end of the elevator box has an upper end. There has been provided a low-rise hydraulic elevator that moves an elevator box up and down by an expansion and contraction operation of a hydraulic cylinder that is connected and erected on a base of a frame assembly (Patent Document 1).
JP-A-5-78058 “Hydraulic Elevator / Hydraulic Elevator Features, Market Background, and System Overview” / Hydraulic / Pneumatic Technology 2002 / P37-P41

  Conventionally, lifting devices using hydraulic cylinders have been widely used for cargoes with a low lifting height and medium- and low-rise apartments by taking advantage of the characteristics thereof. However, there is provided an electric lifting device in which a hoisting machine is provided in the hoistway and a machine room is not required. Recently, the number of hydraulic lifting devices has been greatly reduced.

  In addition, the lifting device using the hydraulic cylinder needs to be individually designed and configured for each elevator by taking over the elevator technical standards, and thus is complicated and lacks versatility. Further, conventionally, it has been necessary to individually install necessary devices such as a hydraulic cylinder, a hydraulic pump, a control valve, a control panel, etc., so that there is a space problem such as requiring a machine room.

  The hydraulic elevator for low houses according to Patent Document 1 is intended for low houses on the 4th floor and below, but the frame body that the elevator box moves up and down is unitized, and a single hydraulic cylinder is installed in this frame body. And the structure which connects the upper end of a hydraulic cylinder to an elevator box is employ | adopted. As a result, the degree of freedom in design becomes narrower and lacks versatility, and the necessary equipment such as a hydraulic cylinder, a hydraulic pump, a control valve, and a control panel must each have a separate installation space. . Furthermore, it is necessary to support all loads with a single hydraulic cylinder, and no fuel-safe measures are taken when a failure occurs in the hydraulic cylinder. In addition, since all loads are received by one hydraulic cylinder, the hydraulic cylinder is required to have a size and pressure resistance corresponding to it, and the strength of the connecting end connecting the elevator box and the hydraulic cylinder takes into account stress concentration. A strong one is required.

  Therefore, while maintaining the advantages of a lifting device that uses a hydraulic cylinder, the hydraulic system has a versatile hydraulic cylinder that can be installed in a constrained space in the hoistway by combining the entire hydraulic system in a compact and compact manner. The development of the lifting device using the is expected. Therefore, the present invention solves the problems of the lifting device using the hydraulic cylinder described above, has a small installation space, is easy to construct, has a high degree of design freedom, and can be used in the event of a failure. It is an object of the present invention to provide an elevating device using a hydraulic cylinder equipped with an emergency control mechanism that can be stopped and lowered safely in response to the occurrence of the occurrence, and an emergency control method in the elevating device.

  In order to achieve the above object, the present invention has a pair of left and right hydraulic cylinders, an electric hydraulic pump, and a common frame in which a pair of left and right columns are erected on a bottom plate and the pair of left and right columns are connected by a beam. A lifting device using a hydraulic cylinder in which a hydraulic pipe and a control valve for supplying and controlling pressure oil from an electric hydraulic pump to a hydraulic cylinder are integrally assembled is provided.

  Specifically, a pair of left and right struts are erected on the bottom plate, a common frame formed by connecting the pair of left and right struts with a beam, the head side is supported on the bottom plate, and the rod side is upward along the column. A pair of standing left and right hydraulic cylinders, a pair of left and right sheaves fixed to the rod ends of the pair of left and right hydraulic cylinders, an electric hydraulic pump fixed in a common frame, a control valve and a relay block from the electric hydraulic pump The hydraulic piping for supplying pressure oil to the head side and the rod side of the pair of left and right hydraulic cylinders via one end, one end is fixed in the common frame, and the other end is fixed to the lifting body via the pair of left and right sheaves The cable is connected to the relay block and the hydraulic piping connecting the head side of each of the pair of left and right hydraulic cylinders. Respectively disposing the raising emergency shutoff valve in the hydraulic pipe connecting the respective rod side of the pair of hydraulic cylinders.

  The emergency shut-off valve for ascending is a hydraulic oil that is caused by the occurrence of a failure when a failure such as breakage of the hydraulic piping of one of the left and right hydraulic cylinders or cutting of the rope occurs when the lifting body is raised. The valve closes in response to changes in the flow rate. Then, after the emergency shut-off valve for raising is closed, a pressure switch for urgently stopping the electric hydraulic pump in response to an increase in pressure due to pressure oil supplied from the electric hydraulic pump, and a valve that is opened after the emergency stop of the electric hydraulic pump. An emergency lowering valve for safely lowering the lifting body.

  The emergency shut-off valve for lowering is a pressure oil caused by the occurrence of a failure in the event of a failure such as breakage of the hydraulic piping of one of the left and right hydraulic cylinders or cutting of the rope when the lifting body is lowered. In response to the change in the flow rate, the valve is closed to shut off the flow of the pressure oil, and after the shut-off, the return pressure oil of a constant flow rate is passed. The return pressure oil is restricted to a constant flow rate by closing the emergency shut-off valve for lowering, so that the pressure of the relief valve provided in the electric hydraulic pump is set by the pressure oil supplied from the electric hydraulic pump. A pressure switch for urgently stopping the electric hydraulic pump that operates by detecting that the pressure has been increased to an upper limit, and an emergency descent valve that opens after the emergency stop of the electric hydraulic pump to safely lower the elevator.

  Furthermore, in the lifting device using the hydraulic cylinder having the above-described configuration, when a failure such as breakage of the hydraulic piping of one of the hydraulic cylinders or cutting of the rope occurs when the lifting body is raised, the failure is caused. In response to changes in the flow rate of pressure oil, the emergency shut-off valves for both the left and right hydraulic cylinders are closed, and the supply of pressure oil to both hydraulic cylinders is completely shut off. The pressure oil supplied from the hydraulic pump is increased to the set pressure of the relief valve provided in the electric hydraulic pump, and when this pressure increase is detected, the pressure switch is activated to stop the electric hydraulic pump in an emergency and Provided is an emergency control method in an elevating device using a hydraulic cylinder, wherein the elevating body is safely lowered by opening a lowering valve.

  In addition, when a failure such as breakage of the hydraulic piping of one of the hydraulic cylinders or cutting of the rope occurs when the lifting body is lowered, the failure is detected in response to changes in the flow rate of pressure oil resulting from the failure. By closing the descending emergency shut-off valve of the other hydraulic cylinder that has not occurred, the flow of return pressure oil from the other hydraulic cylinder is shut off, and after shutting off, the constant flow rate after shutting off from this descending emergency shut-off valve Circulates as return pressure oil so that the lifting body can be lowered by its own weight safely and landed by the other hydraulic cylinder without any trouble, and the return pressure oil is electrically controlled by being restricted to a constant flow rate. When the pressure of the relief valve provided in the hydraulic pump is increased to the set pressure by the pressure oil supplied from the electric hydraulic pump, this pressure increase is detected and the pressure switch is operated to With an emergency stop hydraulic pump, to safely lower the lifting body by opening the emergency lowering valve.

  According to the present invention, a pair of left and right hydraulic cylinders, an electric hydraulic pump, and other necessary equipment are integrally assembled in advance in a common frame, so installation space is small, construction is simple, and design freedom is reduced. It is possible to obtain a lifting device that is high and versatile and conforms to elevator safety standards. Since a pair of left and right hydraulic cylinders are used, even if a failure occurs on one side, it is possible to safely descend with the other hydraulic cylinder. That is, an emergency shut-off valve for lowering is arranged in each hydraulic pipe connecting the relay block and each head side of the pair of left and right hydraulic cylinders, and each of the hydraulic pipe connecting each relay side and each rod side of the pair of left and right hydraulic cylinders. Since the emergency shut-off valve for ascent is arranged, if a failure occurs when the lifting body is raised or lowered, both hydraulic cylinders respond to changes in the flow rate of pressure oil due to the occurrence of the failure. By taking measures such as cutting off the supply of pressure oil, it can be safely stopped and lowered.

  Furthermore, necessary hydraulic equipment such as an electric hydraulic pump can be accommodated in an empty space between the columns of the common frame, and a control box can be accommodated in the upper space. And the indirect drive type raising / lowering system which uses the hydraulic cylinder which does not require a machine room is provided by enabling the whole raising / lowering apparatus to be installed in the clearance gap between the wall surface of a hoistway, and a raising / lowering body.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a lifting device using a hydraulic cylinder according to the present invention and an emergency control method in the lifting device will be described below with reference to the drawings. FIG. 1 is an overall perspective view of an elevating device 1 using a hydraulic cylinder according to the present invention, and FIG. 2 is an embodiment in which the elevating body 2 is moved up and down along the guide rails 3a and 3b using the elevating device 1. FIG. 3 is an overall perspective view showing a state in which the elevating body 2 is raised. In the figure, an elevating device 1 includes a pair of left and right hydraulic cylinders 4a and 4b, an electric hydraulic pump 5, and hydraulic pipes 6a and 6b for supplying and controlling pressure oil from the electric hydraulic pump 5 to the hydraulic cylinders 4a and 4b. 38 a, 38 b, 39 a, 39 b, the control valve 7, and other necessary equipment are integrally assembled to the common frame 17.

  4 is a front view of the common frame 17, FIG. 5 is a side view thereof, and FIG. 6 is a plan view thereof. The common frame 17 has a pair of left and right support columns 9a and 9b standing on a plate-shaped bottom board 8, and the upper, middle, and lower ends of the pair of support columns 9a and 9b are respectively connected to the plate-like upper beam 10. , The middle beam 11 and the lower beam 12 are connected. Reference numerals 13a and 13b denote hydraulic cylinder support brackets which are erected in the vertical direction on the bottom plate 8 to fix the hydraulic cylinders 4a and 4b, and reference numerals 14a and 14b denote support columns 9a and 9b for fixing the electric hydraulic pump 5, respectively. It is a pair of left and right electric hydraulic pump mounting brackets projecting horizontally from.

  Reference numeral 36b denotes a screw hole drilled in the upper end portion of the support column 9b, which is used to fix the rod cover 20b of the hydraulic cylinder 4b to the support column 9b, and 37b is drilled in the lower end portion of the support column 9b. The screw hole is used to support the head cover 19b of the hydraulic cylinder 4b on the support column 9b. Note that similar screw holes (not shown) are also formed in the upper end and lower end of the column 9a. 15a, 15b, 15c, 15d are a pair of upper, lower, left, and right control box mounting brackets projecting horizontally from the support columns 9a, 9b in order to fix a control box 30 to be described later from above and below. It is a pair of left and right suspension rings for lifting.

  The bottom of the electric hydraulic pump 5 is placed on the electric hydraulic pump mounting brackets 14a and 14b of the common frame 17 having the above-described configuration, and is fixed with appropriate bolts or the like. An electric motor 18, a control valve 7, and other necessary members are arranged on the upper surface of the electric hydraulic pump 5. The hydraulic cylinder brackets 13a and 13b erected on the bottom plate 8 support the head covers 19a and 19b of the hydraulic cylinders 4a and 4b, and the hydraulic cylinders 4a and 4b are erected along the columns 9a and 9b. In addition, the head covers 19a, 19b of the hydraulic cylinders 4a, 4b are fixed to the columns 9a, 9b with bolts or the like through appropriate brackets using the screw holes 37b of the columns 9b and the screw holes (not shown) of the columns 9a. To do.

  The rod covers 20a, 20b of the hydraulic cylinders 4a, 4b are provided with support plates 21a, 21b extending horizontally as retainers, and the support plates 21a, 21b are arranged so that the rods of the hydraulic cylinders 4a, 4b pass through. Has been. The support plates 21a and 21b are fixed to the columns 9a and 9b with bolts or the like through appropriate brackets using screw holes 36b of the columns 9b and screw holes (not shown) of the columns 9a. The sheaves 22a and 22b are fixed to the rod ends of the hydraulic cylinders 4a and 4b protruding from the support plates 21a and 21b. Further, on the support plates 21a and 21b, ridge fixing tools 23a and 23b for fixing one end of the ridges 27a and 27b wound around the sheaves 22a and 22b are erected.

  A relay block 24 to which pressure oil is supplied from the electric hydraulic pump 5 via the hydraulic pipes 6a and 6b is fixed to the middle beam 11 of the common frame 17. The relay block 24 and the head covers 19a and 19b of the hydraulic cylinders 4a and 4b are fixed. Between the two, hydraulic pipes 38a and 38b for supplying pressure oil for ascent are disposed. On the side of the head covers 19a, 19b of the hydraulic pipes 38a, 38b, descending emergency shut-off valves 26a, 26b are respectively provided. The descending emergency shut-off valves 26a and 26b are configured to shut off the flow of the pressure oil when the valve is closed, and to add a function of allowing a constant flow rate after the shut-off that allows the elevator 2 to be lowered safely. It functions as a throttle valve.

  Further, hydraulic pipes 39a and 39b for supplying pressure oil for lowering are disposed between the relay block 24 and the rod covers 20a and 20b of the hydraulic cylinders 4a and 4b. Ascending emergency shut-off valves 25a and 25b are respectively provided on the rod covers 20a and 20b side of the hydraulic pipes 39a and 39b. The rising emergency shut-off valves 25a and 25b are configured to completely stop the flow of pressure oil when the valve closing operation is performed.

  Reference numeral 30 denotes a control box for storing necessary control devices and switches for driving and controlling the elevating device 1, and controls the upper portions of the control box mounting brackets 15a and 15b fixed to the columns 9a and 9b. The lower part is supported by the box mounting brackets 15c and 15d, and is integrally assembled to the common frame 17. 7 is a front view of the main part of the lifting device 1 excluding the hydraulic pipes 6a, 6b, 38a, 38b, 39a, 39b and the like, and FIG. 8 is a side view thereof.

  In this way, the lifting device 1 is formed by assembling necessary equipments integrally in the common frame 17, and in use, the lifting device 1 is installed at a predetermined installation place, and the lifting body 2 and the hydraulic cylinder are moved up and down. It is only necessary to connect 4a and 4b via the ropes 27a and 27b. FIG. 2 shows an example in which the lifting / lowering device 1 is used as a driving device for lifting / lowering the lifting / lowering body 2. Guide rails 3a and 3b are erected at predetermined intervals on a foundation 31 that can withstand a design weight, and guides are provided. The elevating body 2 is installed on the rails 3a and 3b through a plurality of guide rollers 29 so as to be movable up and down. The base plate 8 is fixed on the foundation 31 by an appropriate means such as an anchor bolt, and the lifting device 1 is firmly installed. Then, one ends of the ropes 27a and 27b such as chains are fixed to the rope fixing tools 23a and 23b on the support plates 21a and 21b, respectively, and the other ends are wound around the sheaves 22a and 22b of the hydraulic cylinders 4a and 4b. The installation is completed by fixing to the rope fixing devices 28a and 28b disposed at the lower end of the lifting body 2 respectively.

  In use, by driving the electric motor 18, pressure oil of a predetermined pressure is supplied from the hydraulic tank (not shown) of the electric hydraulic pump 5 to the relay block 24 via the hydraulic pipe 6 a and branched from the relay block 24. Are supplied from the head covers 19a, 19b to the hydraulic cylinders 4a, 4b via the hydraulic pipes 38a, 38b and the descending emergency shut-off valves 26a, 26b. The supplied hydraulic oil extends the rods of the hydraulic cylinders 4a and 4b and raises the sheaves 22a and 22b, so that the ropes 27a and 27b such as chains also rise and are fixed to the other ends of the ropes 27a and 27b. The lifted / lowered body 2 is raised by a predetermined height. At this time, pressure oil is supplied from the hydraulic pipes 39a and 39b toward the relay block 24, and is returned from the relay block 24 to the hydraulic tank via the hydraulic pipe 6b.

  When lowering the elevating body 2, by driving the electric motor 18, pressure oil of a predetermined pressure is supplied from the hydraulic tank (not shown) of the electric hydraulic pump 5 to the relay block 24 via the hydraulic pipe 6 b and relayed. It branches from the block 24 and is supplied to the hydraulic cylinders 4a and 4b from the rod covers 20a and 20b via the hydraulic pipings 39a and 39b and the emergency emergency shutoff valves 25a and 25b. The supplied pressure oil reduces the rods of the hydraulic cylinders 4a and 4b and lowers the sheaves 22a and 22b, so that the ropes 27a and 27b such as chains are also lowered and fixed to the other ends of the ropes 27a and 27b. The lifted body 2 is lowered by a predetermined height. At this time, pressure oil is supplied from the hydraulic pipes 38a and 38b toward the relay block 24, and returned from the relay block 24 to the hydraulic tank via the hydraulic pipe 6a.

  These ascending, descending and stopping operations can be performed by a control device housed in the control box 30. In addition, as long as the raising / lowering body 2 is about 10 m of raising / lowering heights, what kind of uses, such as a level | step difference canceller, the elevator for cargo handling in a three-dimensional warehouse, a business elevator, a home elevator, may be used.

  Since the lifting / lowering device 1 according to the present invention uses a pair of left and right hydraulic cylinders 4a and 4b, the load received by the two hydraulic cylinders 4a and 4b can be halved. Therefore, according to the present invention, the conventional hydraulic cylinder as shown in Patent Document 1 that receives all loads with one hydraulic cylinder requires a size and pressure resistance corresponding to the load. It is possible to improve the problem that the strength of the connecting portion to be connected is required to be strong considering the stress concentration, and the size of the hydraulic cylinders 4a and 4b can be reduced. In addition, since the fixed ends of the lifting body 2 are dispersed and connected at two places with appropriate spans, the design strength of the fixed portion can be greatly reduced.

  However, on the other hand, the pressure oil flowing from the electric hydraulic pump 5 to the left and right hydraulic cylinders 4a and 4b via the relay block 24 is once damaged in the hydraulic pipes 6a, 6b, 38a, 38b, 39a, 39b, the ropes 27a, When a failure occurs on the system such as the disconnection of 27b, the pressure balance between the hydraulic cylinder 4a or 4b in which the failure has occurred and the hydraulic cylinder 4a or 4b in which the failure has not occurred is lost. There is a problem to be solved in terms of safety that the pressure oil from 5 and the hydraulic pressure in the circuit flow into the low load side and the hydraulic cylinder 4a or 4b escapes. Therefore, the present invention is equipped with the above-described ascending emergency shut-off valves 25a and 25b and the descending emergency shut-off valves 26a and 26b so that even when a fault occurs, it can be stopped and lowered safely in response to the occurrence of the fault. Emergency control mechanism.

  Next, an emergency control mechanism for safely stopping and lowering when a failure occurs when the lifting body 2 is raised or lowered will be described. FIG. 9 is a chart showing an emergency control method in the case of failure in breaking the ropes 27a and 27b during the lifting operation of the lifting body 2, and FIG. 10 is an emergency control method during the lowering operation of the lifting body 2. FIG. 11 shows an example of a hydraulic system diagram.

  The lifting / lowering device 1 using the hydraulic cylinder according to the present invention supplies the rising pressure oil from one electric hydraulic pump 5 via the relay block 24 to the head covers 19a of the hydraulic cylinders 4a and 4b from the hydraulic pipes 38a and 38b. On the 19b side, the descending pressure oil is diverted from the hydraulic pipes 39a and 39b to the rod covers 20a and 20b of the hydraulic cylinders 4a and 4b, or is made to flow alone. Therefore, when any trouble occurs in the hydraulic pipes 6a, 6b, 38a, 38b, 39a, 39b, the ropes 27a, 27b, etc., the pressure oil is preferentially applied to the hydraulic cylinder 4a (or the hydraulic cylinder 4b) having the lower load pressure. Since it tries to flow, it is very dangerous for the system operation.

  Therefore, in the present invention, the emergency emergency shut-off valves 25a and 25b for raising mainly acting against the flow rate change at the time of raising are provided in the hydraulic pipes 39a and 39b connecting the relay block 24 and the rod covers 20a and 20b of the hydraulic cylinders 4a and 4b. Each is arranged directly. Further, descending emergency shut-off valves 26a, 26b (mainly constant flow rate after shutting off) are provided in the hydraulic piping 38a, 38b connecting the relay block 24 and the head covers 19a, 19b of the hydraulic cylinders 4a, 4b. The function to distribute is added) directly. By the interaction of the ascending emergency shut-off valves 25a and 25b and the descending emergency shut-offs 26a and 26b, it is possible to safely stop, descend and land. Specifically, it is as follows.

[Emergency control method when raising and lowering body]
As shown in FIG. 9, in step 41, the electric motor 18, electric hydraulic pump 5, and control valve 7 / b are turned on, and from the electric hydraulic pump 5, the relay block 24, hydraulic pipes 38a and 38b, the descending emergency shut-off valve 26a, An automatic operation is started to raise the lifting body 2 by supplying pressure oil in the upward direction from the head covers 19a, 19b side of the hydraulic cylinders 4a, 4b via the 26b and driving the left and right hydraulic cylinders 4a, 4b in the extending direction. To do. If the cable 27b of the hydraulic cylinder 4b is broken in step 42 during this ascending operation, the load pressure decreases as shown in step 43, and the flow rate of the upper pressure-rising oil toward the hydraulic cylinder 4b increases. With the extension of the hydraulic cylinder 4b, the hydraulic pipe 39b is supplied. Therefore, since the flow rate passing through the rising emergency cutoff valve 25b increases, the rising emergency cutoff valve 25b is turned on in step 44 in response to the flow rate passing through the rising emergency cutoff valve 25b exceeding the set amount. In step 45, the pressure oil passage to the hydraulic cylinder 4b is closed, and the hydraulic cylinder 4b is stopped as shown in step 46.

  By closing the pressure oil passage to the hydraulic cylinder 4b in step 45, all the rising pressure oil flows to the hydraulic cylinder 4a side, and as shown in step 47, the upward pressure increase oil flow rate to the hydraulic cylinder 4a is increased. As the hydraulic cylinder 4a expands and is supplied to the hydraulic piping 39a, the flow rate passing through the rising emergency shut-off valve 25a increases, so the flow rate passing through the rising emergency shut-off valve 25a becomes a set amount. In response to exceeding, in step 48, the emergency emergency shutoff valve 25a is turned on and closed, and in step 49, the passage of pressure oil to the hydraulic cylinder 4a is closed. Thereby, the supply of the pressure oil to both the hydraulic cylinders 4a and 4b is completely stopped.

  By closing the passage of pressure oil to both the hydraulic cylinders 4a and 4b, as shown in step 50, the pressure oil supplied from the electric hydraulic pump 5 is provided in the electric hydraulic pump 5 in the upward direction. The pressure is increased to the set pressure of the relief valve 35, and when the pressure rise is detected, the pressure switch 33 is turned on in step 51 to operate. In step 52, the motor 18, the electric hydraulic pump 5, and the control valve 7 / b side are turned on. By turning off, the lifting body 2 is completely emergency stopped. At this time, the hydraulic oil on the hydraulic cylinder 4 a side is held by the counterbalance valve 36 and the emergency lowering valve 32, and the hydraulic cylinder 4 a stops as shown in step 53.

  Thereafter, as shown in step 54, the emergency lowering valve 32 is turned on to open the emergency lowering operation. That is, as shown in step 55, when the flow rate control valve 34 controls the amount of oil to be constant, the return pressure oil from the hydraulic cylinder 4a to the electric hydraulic pump 5 starts to flow and slowly falls by its own weight. Then, as shown in step 56, the vehicle lands at a predetermined position, detects the landing, turns off the emergency lowering valve 32, and closes the emergency lowering operation. Since the flow rate control valve 34 has a pressure guarantee function and can always circulate a constant flow rate regardless of the load pressure of the hydraulic cylinder 4a, the lifting body 2 can be safely landed. When a failure such as chain breakage occurs on the hydraulic cylinder 4a side, the operations of the hydraulic cylinders 4b and 4a are reversed.

[Emergency control method when the elevator is lowered]
As shown in FIG. 10, in step 61, the electric motor 18, the electric hydraulic pump 5, and the control valve 7 / a are turned on, and the electric hydraulic pump 5 is connected to the relay block 24, the hydraulic pipes 39a and 39b, the rising emergency cutoff valve 25a, Automatic operation for lowering the lifting body 2 by supplying pressure oil in the downward direction from the rod cover 20a, 20b side of the hydraulic cylinders 4a, 4b via the 25b and driving the left and right hydraulic cylinders 4a, 4b in the contraction direction. Start. If the cable 27b of the hydraulic cylinder 4b is broken in step 62 during the descending operation, the load pressure supported by the hydraulic cylinder 4b is lost, and all the load pressure of the lifting body 2 is received by the hydraulic cylinder 4a. Become. Therefore, the hydraulic cylinder 4b that has run out of load slowly descends or stops its own weight as shown in step 63.

  On the other hand, since all of the descending pressure oil flows into the hydraulic cylinder 4a that has received all the loads of the lifting body 2, the load pressure increases as shown in step 64, and the hydraulic cylinder 4a is reduced. The driving speed increases. Then, as shown in step 65, the lower pressure-lowering oil flow rate to the hydraulic cylinder 4a increases and is supplied to the hydraulic piping 38a as the hydraulic cylinder 4a shrinks, so the flow rate passing through the descending emergency shut-off valve 26a increases. As shown in step 66, the descending emergency shut-off valve 26a is turned on and closed.

  From this state, the return pressure oil from the hydraulic cylinder 4a returns toward the electric hydraulic pump 5 with the flow rate after the shut-off of the descending emergency shut-off valve 26a shown in step 67. Therefore, the elevating body 2 shuts off the hydraulic cylinder 4a. When the rear flow rate slowly lowers its own weight and reaches a predetermined landing position as shown in step 68, the landing is detected, and in step 69, the motor 18, the electric hydraulic pump 5 and the control valve 7 / a are turned off. Then, as shown in step 70, the hydraulic cylinder 4a is stopped.

  Further, when the passage flow rate exceeds the post-shutdown flow rate while the hydraulic cylinder 4a is decreasing at the post-shutdown flow rate shown in step 67, the pressure is increased to the set pressure of the relief valve 35 provided in the electric hydraulic pump 5. When the pressure rise is detected, the pressure switch 33 is turned on in step 71 and is operated. In step 72, the electric motor 18, the electric hydraulic pump 5, and the control valve 7 / b are turned off. Emergency stop. At this time, the hydraulic oil on the hydraulic cylinder 4 a side is held by the counterbalance valve 36 and the emergency lowering valve 32, and the hydraulic cylinder 4 a stops as shown in step 73.

  Thereafter, as shown in step 74, the emergency lowering operation is started by opening the emergency lowering valve 32 and opening it. That is, as shown in step 75, when the flow rate control valve 34 controls the oil amount to a constant value, the return pressure oil from the hydraulic cylinder 4a to the electric hydraulic pump 5 starts to flow and slowly falls by its own weight. Then, as shown in step 76, the user steps down, detects the landing, turns off the emergency lowering valve 32, and closes the emergency lowering operation. Since the flow rate control valve 34 has a pressure guarantee function and can always circulate a constant flow rate regardless of the load pressure of the hydraulic cylinder 4a, the lifting body 2 can be safely landed. When a failure such as chain breakage occurs on the hydraulic cylinder 4a side, the operations of the hydraulic cylinders 4b and 4a are reversed.

[Emergency control method during power failure]
At the time of a power failure, the electric hydraulic pump 5 and the control valve are turned off and immediately stopped. When the emergency lowering valve 32 is turned on and opened from this stopped state, the pressure oil on the load side passes through the flow rate control valve 34 from the emergency lowering valve 32 and returns to the hydraulic tank. can do. The emergency lowering valve 32 can be operated by an emergency battery power source and can be manually opened, so that the weight can be lowered even during a power failure.

  The failure is not limited to chain breakage both at the time of rising and lowering, and any failure that causes changes in the flow rate balance of the hydraulic oil in the left and right hydraulic cylinders 4a, 4b, such as breakage of the hydraulic piping or damage to the seal in the hydraulic cylinder. It can correspond to.

  Even if various troubles related to the flow of pressure oil such as breakage of various hydraulic pipes and breakage of seal packing other than the breakage of the above-mentioned ropes 27a, 27b occur, the emergency stop valves 25a, 25b for ascending and the emergency for descending This can be dealt with by combining the operations of the shutoff valves 26a and 26b, and an emergency control mechanism that can safely stop and descend the elevator 2 in response to the occurrence of a fault can be realized.

  As described above in detail, according to the present invention, a pair of left and right hydraulic cylinders, an electric hydraulic pump, and other necessary equipment are assembled together in advance in a common frame. A lifting device that is simple, has a high degree of design freedom, and has versatility can be obtained. Since a pair of left and right hydraulic cylinders are used, even if a failure occurs on one side, it is possible to safely descend with the other hydraulic cylinder. In other words, if a failure occurs when the elevator is raised or lowered, the pressure oil is supplied to one of the failed hydraulic cylinders in response to changes in the flow rate of the pressure oil caused by the failure. By taking measures such as blocking, it is possible to stop and descend safely.

  Therefore, a new fail-safe function in the event of a system failure using a pair of left and right hydraulic cylinders, which is an obstacle to the development of a hydraulic lift that does not require a machine room, and the advantages of a lift using a hydraulic cylinder remain unchanged. In addition, the entire hydraulic system is integrated into a compact and compact, and it can be installed in a constrained space in the hoistway. It does not require a machine room, is versatile, easy to install, and has a high degree of design freedom. Can also stop and descend safely in response to the occurrence of a fault.

  Furthermore, the empty space in the lower part of the common frame can accommodate hydraulic equipment such as a small electric hydraulic pump, and the upper space can also accommodate a control box. It can be installed in a gap between the lifting body and the like.

The whole perspective view which shows an example of the raising / lowering apparatus using the hydraulic cylinder concerning this invention. The whole perspective view which shows embodiment made to raise / lower. The whole perspective view which shows the state which the raising / lowering body raised. The front view which shows an example of a common frame. The side view of FIG. The top view of FIG. The principal part front view of a raising / lowering apparatus. The side view of FIG. The chart figure which shows the emergency control method at the time of climbing operation. The chart figure showing the emergency control method at the time of descent operation. The hydraulic system figure of the raising / lowering apparatus concerning this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Elevating device 2 ... Elevating body 3a, 3b ... Guide rail 4a, 4b ... Hydraulic cylinder 5 ... Electric hydraulic pump 6a, 6b, 38a, 38b, 39a, 39b ... Hydraulic piping 7 ... Control valve 8 ... Bottom board 9a, 9b ... Post 10 ... Upper beam 11 ... Middle beam 12 ... Lower beam 13a, 13b ... Hydraulic cylinder bracket 14a, 14b ... Electric hydraulic pump mounting bracket 15a, 15b, 15c, 15d ... Control box mounting bracket 16a, 16b ... Suspension ring 17 ... Common Frame 18 ... Electric motor 19a, 19b ... Head cover 20a, 20b ... Rod cover 21a, 21b ... Support plate 22a, 22b ... Sheave 23a, 23b, 28a, 28b ... Rope fixing device 24 ... Relay block 25a, 25b ... Emergency block for ascent Valves 26a, 26b ... Emergency shut-off valves for lowering 27a, 27b ... Rope 29 ... Guide Over La 30 ... control box 31 ... foundation 32 ... emergency lowering valve 33 ... pressure switch 34 ... flow control valve 35 ... relief valve 36 ... counterbalance valve

Claims (11)

  Supply a pair of left and right hydraulic cylinders, an electric hydraulic pump, and hydraulic oil from the electric hydraulic pump to the hydraulic cylinder in a common frame that is constructed by standing a pair of left and right pillars on the bottom plate and connecting the pair of left and right columns with beams. A lifting device using a hydraulic cylinder, wherein hydraulic piping for control and a control valve are integrally assembled.   A pair of left and right struts are erected on the bottom plate, a pair of left and right struts are erected along the column with a common frame formed by connecting the pair of left and right struts with a beam, the head side supported by the bottom plate, and the rod side facing up Hydraulic cylinder, a pair of left and right sheaves fixed to the rod ends of the pair of left and right hydraulic cylinders, an electric hydraulic pump fixed in a common frame, and a pair of left and right via the control valve and relay block from the electric hydraulic pump A hydraulic pipe for supplying pressure oil to the head side and the rod side of the hydraulic cylinder, and a rope having one end fixed in the common frame and the other end fixed to the lifting body via a pair of left and right sheaves, A lifting device using a hydraulic cylinder characterized by comprising:   An emergency shut-off valve for lowering is arranged in each hydraulic piping that connects the relay block and the head side of each of the pair of left and right hydraulic cylinders, and each of the hydraulic piping that connects the relay block and each rod side of the pair of left and right hydraulic cylinders is used for ascending A lifting device using the hydraulic cylinder according to claim 2, wherein an emergency shut-off valve is arranged.   The emergency shut-off valve for ascending is the flow rate of pressure oil caused by the occurrence of a failure such as breakage of the hydraulic piping of one of the left and right hydraulic cylinders, cutting of the rope, etc. 4. A lifting device using a hydraulic cylinder according to claim 3, wherein the valve is closed in response to a change in the pressure.   After the lift emergency shut-off valve is closed, a pressure switch that stops the electric hydraulic pump in response to an increase in pressure due to pressure oil supplied from the electric hydraulic pump, and a valve that opens after the emergency stop of the electric hydraulic pump. The raising / lowering apparatus using the hydraulic cylinder of Claim 4 which has an emergency descent | fall valve which lowers | hangs a body safely.   The emergency shut-off valve for lowering is the flow rate of pressure oil caused by the occurrence of a failure such as breakage of the hydraulic piping of one of the left and right hydraulic cylinders or cutting of the rope when the lifting body is lowered. 4. A lifting device using a hydraulic cylinder according to claim 3, wherein the hydraulic pressure cylinder is closed to shut off the flow of the pressure oil and to flow the return pressure oil at a constant flow rate after the shut-off.   The return pressure oil is restricted to a constant flow rate by closing the emergency shut-off valve for lowering, so that the pressure of the relief valve provided in the electric hydraulic pump is increased to the set pressure by the pressure oil supplied from the electric hydraulic pump. 7. A hydraulic cylinder according to claim 6, further comprising: a pressure switch for urgently stopping the electric hydraulic pump that operates upon detecting the occurrence of an emergency; and an emergency lowering valve for opening the elevator body safely after the emergency stop of the electric hydraulic pump. Lifting device using. In the lifting device using the hydraulic cylinder according to any one of claims 2 to 5,
When a failure such as breakage of the hydraulic piping of one of the hydraulic cylinders or cutting of the rope occurs when the elevator is raised, a pair of left and right is responded to the change in the flow rate of pressure oil resulting from the failure. By closing the emergency shut-off valves for both lifts of the hydraulic cylinders, the supply of pressure oil to both hydraulic cylinders is completely shut off, and then responds to the pressure increase due to the pressure oil supplied from the electric hydraulic pump. An emergency control method in a lifting device using a hydraulic cylinder, wherein the pressure switch is operated to stop the electric hydraulic pump urgently, and the lifting body is safely lowered by opening the emergency lowering valve. In the lifting device using the hydraulic cylinder according to any one of claims 2 to 5,
When a failure such as breakage of the hydraulic piping of one of the hydraulic cylinders or cutting of the rope occurs when the elevator is raised, a pair of left and right is responded to the change in the flow rate of pressure oil resulting from the failure. By closing the emergency shut-off valves for both lifts of the hydraulic cylinders and completely shutting off the supply of pressure oil to both hydraulic cylinders, the pressure oil supplied from the electric hydraulic pump is transferred into the electric hydraulic pump. The pressure rises up to the set pressure of the relief valve provided, this pressure rise is detected, the pressure switch is activated to stop the electric hydraulic pump in an emergency, and the emergency lowering valve is opened to safely lower the elevator An emergency control method for an elevating device using a hydraulic cylinder. In the lifting device using the hydraulic cylinder according to any one of claims 2, 3, 6, and 7,
If a failure such as breakage of the hydraulic piping of one of the hydraulic cylinders or cutting of the rope occurs when the elevator is lowered, a failure occurs in response to the change in the flow rate of the pressure oil caused by the failure. By closing the emergency shut-off valve for lowering the other hydraulic cylinder, the flow of return pressure oil from the other hydraulic cylinder is shut off, and after shutting off, the constant flow rate is returned from the emergency shut-off valve for lowering. An emergency control method in an elevating apparatus using a hydraulic cylinder that causes a lifting body to descend by its own weight safely and land on the other hydraulic cylinder without causing a failure by circulating as pressure oil. In the lifting device using the hydraulic cylinder according to any one of claims 2, 3, 6, and 7,
If a failure such as breakage of the hydraulic piping of one of the hydraulic cylinders or cutting of the rope occurs when the elevator is lowered, a failure occurs in response to the change in the flow rate of the pressure oil caused by the failure. By closing the lowering emergency shut-off valve of the other hydraulic cylinder, the flow of return pressure oil from the other hydraulic cylinder is shut off. In the case where the pressure of the relief valve provided in the electric hydraulic pump is increased to the set pressure by the pressure oil supplied from the electric hydraulic pump by circulating the oil as the oil and restricting the return pressure oil to a constant flow rate, The pressure rise is detected and the electric hydraulic pump is urgently stopped by detecting this pressure rise, and the elevator is safely lowered by opening the emergency lowering valve. Emergency control method in elevator apparatus using a pressure cylinder.

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