JP4906079B2 - Carriage lowering speed adjustment mechanism - Google Patents

Description

  The present invention relates to a mechanism for adjusting a carriage lowering speed according to a vertical conveying apparatus.

  Conventionally, as a vertical conveyance device that raises and lowers a carriage along a guide rail, the carriage and a counterweight are connected by a rope, such as a chain or a wire, and the carriage is raised or lowered by a hoisting device, or connected to a carriage. Examples include a winding drum type that winds the cable body wound around the winding drum. The carriage speed adjustment in these vertical conveying devices is generally performed by inverter control, and the carriage is stopped by an electromagnetic brake attached to the winding device.

Further, a gate opening / closing drive device provided with a hydraulic brake device is also disclosed (for example, see Patent Document 1). According to the gate opening / closing drive device according to Patent Document 1, the rotational force of the spindle accompanying the lowering of the gate is consumed as the driving force (load) of the hydraulic pump, the rotational speed of the spindle is suppressed, and the oil circulation by the hydraulic pump is reduced. It is possible to adjust the load applied to the hydraulic pump by suppressing the spindle, rotate the spindle at an appropriate rotational speed, and appropriately adjust the descending speed of the gate.
JP 2006-97822 A (Claim 1, Claim 4, FIG. 1)

  However, in the conventional vertical conveyance device, there is a possibility that the carriage may fall if a malfunction occurs in the electromagnetic brake. For example, if the contact of the contactor that operates the electromagnetic brake is welded and the brake remains released, the carriage cannot be stopped and falls.

  In addition, a shock absorber is installed below the vertical conveyance device in preparation for the carriage falling, but the energy when the carriage drops is very large, which gives a large impact to the floor and the load. In particular, when the vertical transfer device is installed on the upper floor, it is difficult to secure a space for installing the shock absorber, and there is a possibility that damage such as falling off the floor due to the fall of the carriage may occur.

  In view of the above problems, the inventor of the present application has intensively studied to provide a mechanism for adjusting the lowering speed of the carriage related to the vertical conveying apparatus, and as a result, has reached the present invention.

That is, the gist of the carriage lowering speed adjusting mechanism of the present invention is a mechanism for adjusting the lowering speed of the carriage in a vertical conveying device that raises and lowers the carriage by a winding mechanism connected to the output shaft of the electric motor. A hydraulic pump is connected to the output shaft of the electric motor via a one-way clutch, and an inclined surface toward the lower end of the carriage is provided on the side of the carriage, and the flow rate is increased by the operation of a roller protruding with respect to the inclined surface. control variable throttle valve is disposed in the hydraulic circulation circuit connecting the ports and suction discharged port of said hydraulic pump, said one-way clutch transmits the rotation force in the direction in which the motor lowers the carriage to the hydraulic pump The hydraulic pump is rotated by the rotational force, discharges hydraulic oil from the discharge port, and the hydraulic circulation. Suction from the suction port through the circuit only when the carriage is positioned in the lower portion of the vertical transport device, in that the inclined surface actuates the rollers.

  According to the carriage lowering speed adjusting mechanism of the present invention, the speed of the carriage can be adjusted only when the carriage according to the vertical conveying apparatus is lowered, and it is not necessary to depend on the speed control in the inverter control.

  Further, according to the mechanism of the present invention, even if a problem occurs in the electromagnetic brake, the carriage lowering speed can be limited, and the impact can be minimized.

  Further, when the mechanism of the present invention is applied to a conventional vertical transfer apparatus, the counter weight is not necessary, and the entire apparatus becomes light. Therefore, for example, when the vertical transfer device is installed on the upper floor of two or more floors, there is no possibility that the floor will come off.

  Furthermore, when the mechanism of the present invention is applied to a conventional vertical conveying apparatus, the carriage lowering speed can be limited, and the shock absorber can be made relatively compact.

  Hereinafter, a vertical conveying apparatus including a carriage lowering speed adjusting mechanism according to the present invention will be described in detail with reference to the drawings. In the vertical conveying apparatus 10 shown in FIG. 1, reference numeral 12 denotes a frame standing on the floor F, which is provided with a top plate 14 at the top, and this top plate 14 is used for raising and lowering the carriage 16. A hoisting device 18 is provided. The hoisting device 18 includes an electric motor 20 and a hoisting mechanism 24 connected to one end 22 of the output shaft of the electric motor 20. The carriage 16 is connected to the hoisting device 18 through a chain (not shown), and is supported by a guide rail 26 standing on the floor F so as to be movable up and down. That is, the carriage 16 is lifted by the chain by driving the winding device 18, and the carriage 16 is lifted along the guide rail 26.

  As shown in FIGS. 1 and 2, the vertical conveyance device 10 includes a carriage lowering speed adjustment mechanism 11. Specifically, the operating shaft 34 of the hydraulic pump 32 is connected to the other end 28 of the output shaft of the electric motor 20 included in the hoisting device 18 through a one-way clutch 30 that is engaged by rotation (reverse rotation) in a direction in which the carriage 16 is lowered. It is connected. The discharge port 36 and the suction port 38 of the hydraulic pump 32 are connected by a pipe line 40 to form a hydraulic circulation circuit 42. The hydraulic circulation circuit 42 is provided with a variable throttle valve 44, a tank 46, and a relief valve (not shown).

  In the descending speed adjustment mechanism 11 of the present embodiment, the variable throttle valve 44 is applied as the flow control valve. However, in the present invention, the flow control valve is not limited to the variable throttle valve, and other flow control valves include, for example, Examples thereof include a one-way throttle valve 52, a throttle valve, and a flow rate adjusting valve that will be described later.

  In the vertical conveyance device 10 having the above-described configuration, when the carriage 16 is first lifted, one end 22 of the output shaft of the electric motor 20 of the winding device 18 is rotated forward. Then, the carriage 16 suspended by the chain is lifted by the winding mechanism 24 connected to the one end 22 of the output shaft, and rises along the guide rail 26. In this process, the other end 28 of the output shaft of the electric motor 20 also rotates (forward rotation) in the same direction as the one end 22 of the output shaft. Since the one-way clutch 30 is interposed between the other end 28 of the output shaft and the operating shaft 34 of the hydraulic pump 32, the rotational force of the other end 28 of the output shaft is not transmitted to the operating shaft 34. The pump 32 is not activated.

  On the other hand, when lowering the carriage 16, if one end 22 of the output shaft of the electric motor 20 of the hoisting device 18 is reversely rotated, the carriage 16 suspended by the chain is connected to the one end 22 of the output shaft. 24 and lowered along the guide rail 26. In this process, the other end 28 of the output shaft of the electric motor 20 also rotates (reversely rotates) in the same direction as the one end 22 of the output shaft. Then, the other end 28 of the output shaft meshes with the one-way clutch 30 and the operating shaft 34 of the hydraulic pump 32 connected to the one-way clutch 30 also rotates. That is, the rotational force of the other end 28 of the output shaft is transmitted to the operating shaft 34 via the one-way clutch 30, and the hydraulic pump 32 is rotated by the rotational force transmitted to the operating shaft 34. When the hydraulic pump 32 rotates, the hydraulic oil in the tank 46 is sucked by the hydraulic pump 32, the hydraulic oil is sucked into the hydraulic pump 32 from the suction port 36, and discharged from the discharge port 36 to the pipe line 40. The hydraulic fluid is circulated through the hydraulic circuit 42 in a flow that passes through the variable throttle valve 44 and returns to the tank 46.

  Here, since the variable throttle valve 44 is disposed between the discharge port 36 of the hydraulic pump 32 and the tank 46 in the hydraulic circulation circuit 42, the hydraulic oil sent from the discharge port 36 to the pipeline 40 is discharged. The flow rate can be regulated. Then, by regulating the flow rate of the hydraulic oil by the variable throttle valve 44, the load applied to the electric motor 20 can be increased or decreased, and the speed of the carriage 16 can be adjusted by this load. Specifically, when lowering the carriage 16 at a high speed, the variable throttle valve 44 is opened, so that the hydraulic pump 32 rotates at a high speed and the flow rate of hydraulic oil increases, so the load on the electric motor 20 is reduced. The carriage 16 can be lowered at a high speed. On the other hand, when the carriage 16 is lowered at a low speed or when the speed of the carriage 16 that is lowered at a high speed is reduced due to a failure of an electromagnetic brake or the like, the rotation of the hydraulic pump 32 is slowed down by restricting the variable throttle valve 44. Since the flow rate of the hydraulic oil is reduced, the load on the electric motor 20 is increased, and the lowering speed of the carriage 16 can be reduced.

  As described above, according to the vertical conveyance device 10 including the descending speed adjustment mechanism 11 according to the present embodiment, when the carriage 16 is raised, the electric motor 20 and the hydraulic pump 32 are disconnected by the one-way clutch 30. The carriage 16 can be raised smoothly without applying a load to the electric motor 20. Further, when the carriage 16 is lowered, a load is applied to the electric motor 20 by the operation of the lowering speed adjusting mechanism 11, so that the lowering speed of the carriage 16 is reduced without depending on the speed control by the inverter control provided in the electric motor 20. can do. For example, even if a failure occurs in the electromagnetic brake, the lowering speed of the carriage 16 can be reduced by the lowering speed adjusting mechanism 11, so that even if the carriage 16 falls, the impact is minimized. Can be suppressed. Furthermore, since the impact of the carriage 16 falling can be minimized by the mechanism 11, the shock absorber installed below the vertical conveying device 10 can be made relatively compact.

  Further, in the vertical conveyance device 10 provided with the mechanism 11, the counter weight is not necessary, so that the entire device becomes light. Therefore, for example, when the vertical transfer device 10 is installed on the upper floor of two or more floors, there is no possibility that the floor will come off.

  FIG. 3 is a circuit diagram showing another embodiment of the present invention. In the descent speed adjusting mechanism 50 shown in the figure, a hydraulic pump 32 is directly connected to the other end 28 of the output shaft of the electric motor 20 provided in the hoisting device 18. The discharge port 36 and the suction port 38 of the hydraulic pump 32 are connected by a pipe line 40 to form a hydraulic circulation circuit 42. The hydraulic circulation circuit 42 is provided with a one-way throttle valve 52 and a tank 46. Has been.

  When the descent speed adjusting mechanism 50 having the above-described configuration is applied to the vertical conveying device 10 described above, when the carriage 16 is raised, the one end 22 of the output shaft of the electric motor 20 of the winding device 18 is rotated forward. As a result, the carriage 16 suspended by the chain is lifted by the winding mechanism 24 connected to the one end 22 of the output shaft, and rises along the guide rail 26. In this process, the other end 28 of the output shaft of the electric motor 20 also rotates (forward rotation) in the same direction as the one end 22 of the output shaft, and the hydraulic pump 32 rotates (reversely) by the rotational force of the other end 28 of this output shaft. Rotate. When the hydraulic pump 32 rotates (reversely rotates), the hydraulic oil in the tank 46 is sucked by the hydraulic pump 32 and circulates through the hydraulic circuit 42. In this case, the hydraulic oil is circulated from the tank 46 to the one-way throttle valve. It passes through the check valve provided in 52 and flows backward in the direction of the discharge port 36 of the hydraulic pump 32. Therefore, when the carriage 16 is raised, no load is applied to the electric motor 20, and the carriage 16 can be raised smoothly.

  When the carriage 16 is lowered, the one end 22 of the output shaft of the electric motor 20 of the hoisting device 18 is reversely rotated. In this process, the other end 28 of the output shaft of the electric motor 20 also rotates (reversely rotates) in the same direction as the one end 22 of the output shaft, and the hydraulic pump 32 is rotated by the rotational force of the other end 28 of the output shaft. When the hydraulic pump 32 rotates, the hydraulic oil in the tank 46 is sucked by the hydraulic pump 32, the hydraulic oil is sucked into the hydraulic pump 32 from the suction port 36, and discharged from the discharge port 36 to the pipe line 40. The hydraulic fluid circulates in the hydraulic circuit 42 in the direction opposite to the flow in which the hydraulic oil passes through the one-way throttle valve 52 and returns to the tank 46, that is, when the carriage 16 is raised. After that, similarly to the descending speed adjusting mechanism 11 described above, the load applied to the electric motor 20 can be increased or decreased by controlling the flow rate of the hydraulic oil by the one-way throttle valve 52, and the speed of the carriage 16 can be adjusted by this load.

  FIG. 4 is a front view showing another embodiment of the present invention, and FIG. 5 is a circuit diagram of the embodiment. The vertical conveyance device 10a shown in the figure has substantially the same configuration as the vertical conveyance device 10 described above, but a dock 62 is provided on the side surface of the carriage 16. Further, the lowering speed adjusting mechanism 60 provided in the vertical conveying apparatus 10a has substantially the same configuration as the lowering speed adjusting mechanism 11 described above, but further bypasses the variable throttle valve 44 to the hydraulic circulation circuit 42 of the mechanism 60. A decelerating valve 64 is disposed in the bypass line 41, and the decelerating valve 64 is installed near the lowest position of the carriage 16.

  When the carriage 16 is lowered in the vertical conveyance device 10a having the descending speed adjustment mechanism 60 having the above-described configuration, the rotational force of the other end 28 of the output shaft is the same as that of the vertical conveyance device 10 described above. Is transmitted to the operating shaft 34 via the one-way clutch 30, and the hydraulic pump 32 is rotated by the rotational force transmitted to the operating shaft 34. When the hydraulic pump 32 rotates, the hydraulic oil in the tank 46 is sucked by the hydraulic pump 32, the hydraulic oil is sucked into the hydraulic pump 32 from the suction port 36, and discharged from the discharge port 36 to the pipe line 40. The hydraulic fluid circulates in the hydraulic circulation circuit 42 in such a flow that the hydraulic oil returns to the tank 46 through the deceleration valve 64 or the variable throttle valve 44.

  Here, between the discharge port 36 of the hydraulic pump 32 and the tank 46 in the hydraulic circulation circuit 42, there are provided a deceleration valve 64 and a variable throttle valve 44. Thus, the flow rate of the hydraulic oil sent from the port 36 to the pipe line 40 can be regulated. Then, by regulating the flow rate of the hydraulic oil by the variable throttle valve 44, the load applied to the electric motor 20 can be increased or decreased, and the speed of the carriage 16 can be adjusted by this load. Specifically, when the carriage 16 is lowered above the vertical conveying device 10 a, the dock 62 provided on the carriage 16 does not act on the roller 66 of the deceleration valve 64, so that the discharge port 36 The hydraulic oil discharged to the pipeline 40 flows into the bypass pipeline 41, passes through the deceleration valve 64, and returns to the tank 46. That is, since the flow rate of the hydraulic oil is not regulated by the variable throttle valve 44, the load is not applied to the electric motor 20, and the carriage 16 can be smoothly lowered. On the other hand, when the carriage 16 is lowered to the vicinity of the lowest position of the vertical conveyance device 10a, or when the carriage 16 has dropped to the vicinity of the lowest position due to a failure of the electromagnetic brake or the like, the dock 62 provided on the carriage 16 is Since the switching valve is closed by actuating the roller 66 of the deceleration valve 64, the hydraulic oil discharged from the discharge port 36 to the pipe 40 passes through the variable throttle valve 44. Then, by regulating the flow rate of the hydraulic oil by the variable throttle valve 44, the rotation of the hydraulic pump 32 becomes low speed and the flow rate of the hydraulic oil is reduced. Therefore, the load on the electric motor 20 is increased, and the lowering speed of the carriage 16 is reduced. can do.

  As described above, according to the vertical conveyance device 10a including the descending speed adjustment mechanism 60 according to the present embodiment, the diaphragm 16 is configured to be tighter as the height of the carriage 16 becomes lower. Can be adjusted only in the vicinity of the lowest lowered position related to the vertical conveyance device 10a, so that the carriage 16 can be smoothly lowered without applying a load to the motor 20 above or in the middle of the vertical conveyance device 10a. . Further, according to the mechanism 60, the lowering speed of the carriage 16 near the lowest position can be reduced to a very low speed, and the impact can be minimized.

  FIG. 6 is a circuit diagram showing another embodiment of the present invention. A descending speed adjusting mechanism 60a shown in the figure is a further simplified configuration of the descending speed adjusting mechanism 60 described above. In the present embodiment, the hydraulic oil discharged from the discharge port 36 to the pipe line 40 always passes through the variable throttle valve 44, but when the dock 62 does not act on the roller 66, for example, a vertical conveying device When the carriage 16 is lowered above 10a, since the variable throttle valve 44 is not throttled, no load is applied to the electric motor 20, and the carriage 16 can be smoothly lowered. On the other hand, when the carriage 16 is lowered to the vicinity of the lowest position of the vertical conveyance device 10a, or when the carriage 16 has dropped to the vicinity of the lowest position due to a failure of the electromagnetic brake, the dock 62 operates the roller 66. Since the throttle amount of the variable throttle valve 44 is directly adjusted by the variable throttle valve 44 and the flow rate of the hydraulic oil is regulated by the variable throttle valve 44, the rotation of the hydraulic pump 32 becomes low speed and the flow rate of the hydraulic oil is reduced. Becomes larger, and the lowering speed of the carriage 16 can be reduced. That is, according to the descent speed adjusting mechanism 60a of the present embodiment, the same effect as the descent speed adjusting mechanism 60 can be obtained, and the structure of the mechanism itself can be simplified.

  In the descent speed adjusting mechanism of the present invention, the aspect in which the aperture is tightened as the height of the carriage 16 decreases is not limited to the mechanical aspect described above. For example, like the carriage lowering speed adjusting mechanism 70 shown in the circuit diagram of FIG. 7, the height of the carriage 16 is measured by a length measuring mechanism such as an encoder 72, and the flow rate control valve is controlled by the control device 74 based on the measurement result. An electromagnetic mode in which the aperture amount of 76 is adjusted may be used. The mechanism 70 can also increase or decrease the load applied to the electric motor 20 in accordance with the height of the carriage 16, and the speed of the carriage 16 can be adjusted by this load.

  The embodiments of the present invention exemplified above should not be construed as substantially limiting the technical idea of the present invention. For example, the vertical conveyance device to which the descent speed adjusting mechanism of the present invention is applied is not limited to the illustrated mode, and may be any mode such as a traction type or a winding drum type. The present invention can be carried out without departing from the gist thereof, with appropriate improvements, changes or additions based on the inventive ideas and ideas of those skilled in the art.

It is a front view which shows embodiment of this invention. FIG. 2 is a circuit diagram of the embodiment shown in FIG. 1. It is a circuit diagram which shows other embodiment of this invention. It is a front view which shows other embodiment of this invention. FIG. 5 is a circuit diagram of the embodiment shown in FIG. 4. It is a circuit diagram which shows other embodiment of this invention. It is a circuit diagram which shows other embodiment of this invention.

10, 10a: Vertical transport devices 11, 50, 60, 60a, 70: Descent speed adjusting mechanism 12: Frame 14: Top plate 16: Carriage 18: Winding device 20: Electric motor 22: One end of output shaft 24: Winding mechanism 26: Guide rail 28: The other end 30 of the output shaft 30: One-way clutch 32: Hydraulic pump 34: Operating shaft 36: Discharge port 38: Suction port 40: Pipe line 41: Bypass pipe line 42: Hydraulic circulation circuit 44: Variable throttle valve 46 : Tank 52: One-way throttle valve 62: Dock 64: Deselleration valve 66: Roller

Claims (1)

In a vertical conveyance device that raises and lowers a carriage by a winding mechanism connected to an output shaft of an electric motor, a mechanism for adjusting a lowering speed of the carriage,
A hydraulic pump is connected to the output shaft of the electric motor via a one-way clutch,
An inclined surface toward the lower end of the carriage is provided on the side of the carriage,
The variable throttle valve for controlling the flow rate by the operation of the roller which projects with respect to the inclined surface is arranged in the hydraulic circulation circuit connecting the ports and suction discharged port of the hydraulic pump,
The one-way clutch transmits a rotational force in a direction in which the electric motor lowers the carriage to the hydraulic pump,
The hydraulic pump is rotated by the rotational force, discharges hydraulic oil from the discharge port, and sucks from the suction port through the hydraulic circulation circuit,
The mechanism for adjusting the descent speed of the carriage , wherein the inclined surface operates the roller only when the carriage is positioned below the vertical conveying device .

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