JP4446876B2 - Passenger conveyor refueling equipment - Google Patents

Description

  The present invention relates to an oil supply device used for a passenger conveyor such as an escalator.

  Conventionally, as shown in FIG. 3, this type of oil supply device 20 includes an oil tank 21, a pump 22 for pumping lubricating oil from the oil tank 21, a motor 23 for driving the pump 22, and a discharge from the pump 22. The pressure adjusting valve 24 that keeps the discharged pressure of the lubricating oil below a specified value to prevent overload to the motor 23, and control nozzles 25, 25A, 25B that control the flow rate of the lubricating oil that has come out of the pressure adjusting valve 24 , 25C, and a pipe 26 connecting the control nozzles 25, 25A, 25B, 25C and the discharge side of the pump 22 and the pressure regulating valve 24 are known. Then, by rotating the motor 23 of the oil supply device 20, the lubricant pumped up from the oil tank 21 by the pump 22 is supplied from the control nozzles 25, 25A, 25B, 25C to the drive chain for the handrail of the passenger conveyor and the step chain. It was supposed to be supplied to drive chains.

  However, in the above-described conventional oil supply device 20, the lubricating oil pumped up from the oil tank 21 by the pump 22 has a large viscosity change due to temperature. Therefore, when the temperature of the installation location of the oil supply device 20 is low and the temperature of the lubricating oil is low, the resistance when the lubricating oil passes through the control nozzles 25, 25A, 25B, and 25C is increased, and the pressure in the pipe 26 is increased. Therefore, the lubricating oil in the pipe 26 is returned from the pressure regulating valve 24 to the oil tank 21, and the oil supply to the moving handrail drive chain and the step chain drive chain of the passenger conveyor is insufficient. When the temperature of the installation place of the apparatus 20 is high and the temperature of the lubricating oil is high, the oil supply to the drive chain for the moving handrail and the drive chain for the step chain of the passenger conveyor becomes excessive. As a result, in the passenger conveyor, when the temperature at the place where the fueling device 20 is installed changes greatly, it is necessary to adjust the pressure regulating valve 24 each time, which places a heavy burden on the passenger conveyor maintenance worker. Did not get.

Therefore, regardless of a change in the temperature of the lubricating oil, the oil is supplied from the control nozzles 25, 25A, 25B, 25C of the oil supply device 20 to oil-supplied equipment such as a drive chain for a handrail and a step chain drive chain of a passenger conveyor. In order to prevent the supply amount of lubricating oil from fluctuating greatly, an oil supply system has been developed that keeps the supply amount of lubricant constant by adjusting the supply time of lubricant according to the temperature of the outside air. (For example, refer to Patent Document 1). In addition, the bypass line that returns the oil to the oil tank requires a flow rate control valve with a pressure temperature compensation function that can keep the oil supply amount constant regardless of the pressure and temperature, and a differential pressure across the flow rate control valve. An automatic oiling apparatus has been developed that has a pressure regulating valve that maintains a differential pressure (see, for example, Patent Document 2).
JP-A-11-180668 (paragraph numbers 0010 to 0015, FIGS. 1 to 2) JP 2001-330195 A (paragraph number 0025 to paragraph number 0045, FIG. 1 to FIG. 2)

  However, as described in Japanese Patent Application Laid-Open No. 11-180668 described above, in the oil supply device that adjusts the supply time of the lubricant, temperature detection means for detecting the ambient temperature, lubrication according to the ambient temperature is performed. An adjustment means for adjusting the oil supply time and a control unit for supplying lubricating oil to the oiled equipment based on the oil supply time set by the adjustment means are required, and the structure is complicated. And there was a problem that productivity was bad. Further, as described in JP 2001-330195 A described above, in an automatic fueling device provided with a flow rate control valve with a pressure temperature compensation function, a flow rate with a pressure temperature compensation function having a complicated structure. There is a problem that it is necessary to provide a control valve, a control throttle, etc., the structure is complicated, and the productivity is poor.

  The present invention has been made from the above-described actual state of the prior art, and its purpose is to add a simple part to the current oil supply device, thereby suppressing variations in the supply amount due to temperature changes of the lubricating oil, and passengers It is an object of the present invention to provide an oil supply device for a passenger conveyor that can reduce the labor of a conveyor maintenance worker.

In order to achieve the above object, the present invention provides a tread surface for transporting passengers, a step chain that transmits a driving force to the tread surface, a drive chain for a step chain that transmits a driving force to the step chain, A moving handrail disposed vertically above the tread surface and moving in synchronization with the tread surface, a moving handrail driving device for driving the moving handrail, and a driving device for driving the moving handrail A drive chain for moving handrails for transmitting force, and an oil supply device for supplying at least lubricating oil to the step chain, the drive chain for moving handrails and the drive chain for step chains. A pump for pumping the lubricating oil from the oil tank, a motor for driving the pump, and a discharge of the lubricating oil discharged from the pump A pressure regulating valve that keeps the force below a specified value to prevent overload to the motor, a control nozzle that controls the flow rate of the lubricating oil that has come out of the pressure regulating valve, a discharge side of the control nozzle and the pump, In a passenger conveyor refueling device comprising at least a pipe connected to a pressure regulating valve, the pipe flows to a position near the discharge side of the pump of a pipe connecting the discharge side of the pump and the control nozzle. provided with a branching means for branching the lubricating oil is characterized by a lubricant oil is branched digits set the nozzle return for returning to the oil tank by the branching means.

  Furthermore, the present invention is characterized in that a plurality of the control nozzles are provided.

  Furthermore, the present invention is characterized in that the tread surface for transporting the passenger is a step of an escalator.

According to the present invention, the branching means for branching the lubricating oil flowing through the pipe is provided at a position near the discharge side of the pump of the pipe connecting the discharge side of the pump and the control nozzle, and branched by the branching means. Since a return nozzle is provided to return the lubricating oil to the oil tank, a decrease in the nozzle flow rate of the control nozzle at a low temperature can be suppressed, and an increase in the nozzle flow rate of the control nozzle at a high temperature can be suppressed. There small variations in nozzle flow rate of the lubricating oil be changed out of the control nozzle, to eliminate the need for work appropriately adjusting the pressure control valve in accordance with a change in temperature of the seasons, or the number of the work it becomes possible to reduce significantly, it is possible to reduce the labor of the maintenance worker passenger conveyor, and, to obtain the oil supply device of excellent passenger conveyor productivity .

  Hereinafter, an embodiment of an oil supply device for a passenger conveyor according to the present invention will be described with reference to FIGS. 1 and 2.

  A passenger conveyor 1 such as an escalator shown in FIG. 1 includes a tread surface 2 that conveys passengers, a step chain 3 that transmits driving force to the tread surface 2, and a step chain drive that transmits driving force to the step chain 3. A chain 4, a moving handrail 5 that is arranged vertically above the tread surface 2 and moves in synchronization with the tread surface 2, a moving handrail drive device 6 that drives the moving handrail 5, and A moving handrail drive chain 7 for transmitting a driving force to the moving handrail drive device 6, a main chain 7 A for transmitting the driving force to the moving handrail drive chain 7, these step chains 3, Lubricating equipment for supplying lubricating oil to oiled equipment such as the drive chain 7 for the moving handrail, the main chain 7A, and the drive chain 4 for the step chain 8, is provided with at least.

  As shown in FIG. 1, the oil supply device 8 includes an oil tank 9, a pump 10 that pumps the lubricating oil from the oil tank 9, a motor 11 that drives the pump 10, and a discharge pressure of the lubricating oil discharged from the pump 10. The pressure regulating valve 12 that keeps the pressure below the specified value to prevent overloading the motor 11, and the control nozzle that supplies the lubricating oil to the oil-supplied equipment by controlling the flow rate of the lubricating oil from the pressure regulating valve 12 13, 13A, 13B, 13C, 13A, 13B, and 13C, and a pipe 14 that connects the control nozzles 13, 13A, 13B, and 13C to the discharge side of the pump 10 and the pressure regulating valve 12.

As shown in FIG. 1, the oil supply device 8 flows in the pipe 14 at a position near the discharge side of the pump 10 of the pipe 14 connecting the discharge side of the pump 10 and the control nozzles 13, 13 </ b> A, 13 </ b> B, 13 </ b> C. A branching means 15 for branching the lubricating oil is provided, and a return nozzle 16 for returning the lubricating oil branched by the branching means 15 to the oil tank 9 is provided.

  2 is a characteristic diagram of the flow rate of the lubricating oil (hereinafter referred to as the nozzle flow rate) flowing out from the control nozzles 13, 13A, 13B, and 13C of the oil supply device 8 of the above embodiment and the temperature of the lubricating oil. These are the characteristic figures of the flow volume (henceforth a nozzle flow volume) and the temperature of lubricating oil regarding the conventional oil supply apparatus 20 shown in FIG.

  In the conventional oil supply device 20 shown in FIG. 3, as indicated by a characteristic curve F0 in FIG. 4, when the rated discharge amount L1 of the pump 22 in a state where the pressure regulating valve 24 in FIG. 3 is not opened, lubrication is performed in the high temperature region T2. Since the temperature of the oil becomes high and the viscosity of the lubricating oil decreases, the resistance when the lubricating oil passes through the control nozzle 25 is significantly reduced, and the pressure in the pipe 26 does not increase. Since the nozzle flow rate of the lubricating oil flowing out from 25 becomes L1 (same as the rated discharge amount L1 of the pump 22), the lubricating oil becomes low temperature and the viscosity of the lubricating oil increases in the low temperature region T1, Since the resistance when the lubricating oil passes through the control nozzle 25 is remarkably increased and the pressure in the pipe 26 is increased, the pressure adjusting valve 24 is opened, and the lubricating oil in the pipe 26 is transferred from the pressure adjusting valve 24 to the oil tank 21. Will be returned, the nozzle flow rate of the lubricating oil flowing out of the control nozzle 25 is L0.

  Therefore, it can be seen that a difference L2 between the nozzle flow rate L1 and the nozzle flow rate L0 occurs in the high temperature region T2 and the low temperature region T1, and the variation in the nozzle flow rate of the lubricating oil flowing out from the control nozzle 25 is large. Then, the amount of the lubricating oil returned to the oil tank 21 when the pressure regulating valve 24 is opened becomes a hatched portion W0 shown in FIG.

  On the other hand, in the oil supply device 8 of the above embodiment, the characteristics of the nozzle flow rate of the lubricating oil flowing out from the control nozzles 13, 13A, 13B, and 13C and the temperature of the lubricating oil are represented by the characteristic curve F1 indicated by the solid line in FIG. It becomes like this. In FIG. 2, the alternate long and short dash line indicates a characteristic curve Y1 between the nozzle flow rate of the lubricating oil flowing out from the control nozzles 13, 13A, 13B, and 13C and the temperature of the lubricating oil when the branching means 15 and the return nozzle 16 are not provided. The dotted line represents the characteristic curve Y2 between the nozzle flow rate returning from the return nozzle 16 to the oil tank 9 and the temperature of the lubricating oil, and the two-dotted line represents the characteristic curve Y3 which is the sum of the characteristic curve Y1 and the characteristic curve Y2. Represents. L1 represents the rated discharge amount of the pump 10 when the pressure regulating valve 12 is not opened, and LP represents the nozzle flow rate of the lubricating oil flowing out from the control nozzles 13, 13A, 13B, 13C in the low temperature region T1. Represents the nozzle flow rate of the lubricating oil flowing out from the control nozzles 13, 13A, 13B, 13C in the high temperature region T2, and the hatched portion W1 represents the amount of the lubricating oil returned from the pressure regulating valve 12 to the oil tank 9, respectively. ing.

  In the oil supply device 8 of the above embodiment, in the low temperature region T1, since the lubricating oil becomes low temperature and the viscosity of the lubricating oil increases, the resistance when the lubricating oil passes through the control nozzles 13, 13A, 13B, 13C is low. Since the pressure in the pipe 14 is remarkably increased and the pressure adjustment valve 12 is opened, the lubricating oil flows out from the pressure adjusting valve 12 to the oil tank 9 and at the same time, the lubricating oil flows out from the return nozzle 16 into the oil tank 9. By doing so, the nozzle flow rate LP of the lubricating oil flowing out from the control nozzles 13, 13 </ b> A, 13 </ b> B, and 13 </ b> C is maintained substantially the same as the state where the return nozzle 16 is not provided.

  Further, in the oil supply device 8 of the above embodiment, as the temperature of the lubricating oil increases, the resistance when the lubricating oil passes through the control nozzles 13, 13 </ b> A, 13 </ b> B, and 13 </ b> C and when the lubricating oil passes through the return nozzle 16. Since the resistance decreases, the nozzle flow rate of the lubricating oil flowing out from both the control nozzles 13, 13A, 13B, 13C and the return nozzle 16 increases, and the nozzle flow rate of the lubricating oil flowing out from the return nozzle 16 and the return nozzle 16 are increased. When the sum of the nozzle flow rate of the lubricating oil flowing out from the control nozzles 13, 13A, 13B, and 13C in a state where there is no oil reaches the rated discharge amount L1 of the pump 10, the time when the temperature of the lubricating oil does not reach the high temperature region T2, that is, It exceeds the point E shown in FIG.

  As a result, in the higher temperature region T2, the pressure in the pipe 14 does not increase and the amount of lubricating oil flowing out from the pressure regulating valve 12 decreases, and most of the rated discharge amount L1 of the pump 10 is controlled. The nozzles 13, 13 </ b> A, 13 </ b> B, 13 </ b> C and the return nozzle 16 are discharged. Therefore, the nozzle flow rate of the lubricating oil flowing out from the control nozzles 13, 13A, 13B, 13C in the high temperature region T2 is the lubricating flow out from the control nozzles 13, 13A, 13B, 13C when the branching means 15 and the return nozzle 16 are not provided. Lubricating oil flowing out from the control nozzles 13, 13A, 13B, 13C in the low temperature region T1 is a difference L3 between the nozzle flow rate (characteristic curve Y1) of oil and the nozzle flow rate (characteristic curve Y2) returning from the return nozzle 16 to the oil tank 9. The difference from the nozzle flow rate LP becomes smaller.

  From the above, according to the fueling device 8 of the above embodiment, by providing the branching means 15 and the return nozzle 16, it is possible to suppress a decrease in the nozzle flow rate of the control nozzles 13, 13A, 13B, 13C in the low temperature region T1. The increase in the nozzle flow rate of the control nozzles 13, 13A, 13B, and 13C in the high temperature region T2 can be suppressed, and the lubricating oil that flows out from the control nozzles 13, 13A, 13B, and 13C even when the temperature of the lubricating oil changes. It can be seen that there is little variation in the nozzle flow rate.

  According to the oil supply device 8 of the above embodiment, the variation in the nozzle flow rate of the lubricating oil flowing out from the control nozzles 13, 13A, 13B, 13C due to the temperature change of the lubricating oil is small. The operation of adjusting the pressure regulating valve 12 appropriately can be made unnecessary, or the number of operations can be greatly reduced, and the labor of the passenger conveyor maintenance worker can be reduced.

  Furthermore, according to the above-described embodiment, it is possible to suppress an increase in maintenance cost by making the operation of appropriately adjusting the pressure regulating valve 12 possible, and it is possible to optimize the maintenance fee. Further, according to the fueling device 8 of the above embodiment, the simple structure in which the branching means 15 and the return nozzle 16 are added to the conventional fueling device is excellent in productivity.

  The tread surface 2 of the above embodiment is a tread of an escalator step, but is not limited to this, and includes a pallet-type moving sidewalk pallet, a rubber belt type moving sidewalk rubber belt, and the like.

It is a figure which shows the principal part structure of the oil supply apparatus of the passenger conveyor of this invention. It is a characteristic view of the nozzle flow rate of the control nozzle and the temperature of lubricating oil in the oil supply device of the passenger conveyor of the present invention. It is a figure which shows the principal part structure of the conventional oil supply apparatus of a passenger conveyor. It is a characteristic view of the nozzle flow rate of the control nozzle and the temperature of lubricating oil in the conventional oil supply apparatus for passenger conveyors.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Passenger conveyor 2 Tread surface 3 Step chain 4 Step chain drive chain 5 Moving handrail 6 Moving handrail drive device 7 Moving handrail drive chain 7A Main chain 8 Oil supply device 9 Oil tank 10 Pump 11 Motor 12 Pressure adjustment valve 13, 13A, 13B, 13C Control nozzle 14 Piping 15 Branch means 16 Return nozzle

Claims (3)

A tread surface for transporting passengers, a step chain for transmitting driving force to the tread surface, a step chain drive chain for transmitting driving force to the step chain, and the tread surface disposed vertically above the tread surface Moving handrails that move in synchronization with the same direction, a driving device for moving handrails that drives the moving handrails, and a drive chain for moving handrails that transmits driving force to the driving devices for moving handrails, The step chain, the moving handrail drive chain, and the step chain drive chain are provided with an oil supply device for supplying at least lubricating oil. The oil supply device includes an oil tank and a pump for pumping the lubricating oil from the oil tank; The motor for driving the pump and the discharge pressure of the lubricating oil discharged from the pump are kept below a specified value to the motor. The pressure regulating valve for preventing overload, a control nozzle for controlling the flow rate of lubricating oil from the pressure regulating valve, and a pipe connected to the control nozzle and the discharge side of the pump and the pressure regulating valve In the passenger conveyor oil supply apparatus, a branch means for branching the lubricating oil flowing through the pipe is provided at a position near the discharge side of the pump of the pipe connecting the discharge side of the pump and the control nozzle, and An oil supply device for a passenger conveyor, comprising a return nozzle for returning the lubricating oil branched by the branching means to the oil tank . Fueling device of passenger conveyor according to claim 1, characterized in that said control nozzle, and to provide a plurality.   The refueling device for a passenger conveyor according to claim 1 or 2, wherein the tread surface for conveying the passenger is a step of an escalator.

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