JP4974611B2 - Drop energy attenuation mechanism of lifting carriage - Google Patents

Description

  The present invention relates to a mechanism for attenuating the fall energy of a lifting carriage provided in a vertical conveyance device.

  2. Description of the Related Art Conventionally, as a vertical conveyance device provided with a lifting carriage, a lifting carriage and a counterweight are connected by a rope, such as a chain or a wire, and a rope connected to the lifting carriage is lifted and lowered by a hoisting device. Examples include a winding drum type in which a strip is wound around a winding drum. The speed adjustment of the lifting carriage in these vertical conveying apparatuses is generally performed by inverter control, and the lifting 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 conveying apparatus, if the electromagnetic brake malfunctions, the lifting carriage may fall. For example, when the contact of the contactor that operates the electromagnetic brake is welded and the brake remains released, the lifting carriage cannot be stopped and falls.

  The lifting carriage also falls when the motor shaft of the hoisting device is broken or when the strip connected to the lifting carriage is cut.

  In addition, a shock absorber is installed below the vertical transport device in preparation for the fall of the lifting carriage, but the energy when the lifting carriage drops is very large, and it 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 lifting carriage may occur.

  In view of the above problems, the inventor of the present application has intensively studied to provide a mechanism for attenuating the falling energy of the elevating carriage included in the vertical conveyance device, and as a result, has reached the present invention.

That is, the gist of the drop energy attenuating mechanism of the lift carriage according to the present invention is that the vertical carriage includes a lift carriage that is lifted and lowered by a hoisting device and a brake that brakes the lift carriage. A mechanism for attenuating energy, wherein a sliding port through which a vertically extending rod is inserted is formed at the upper and lower ends of a cylinder in which hydraulic fluid can be stored, and the inside of the cylinder is raised in the middle of the rod. A piston separating the chamber and the lower chamber is fixed, the upper chamber and the lower chamber are connected by a liquid path, a flow control valve is disposed in the liquid path, the elevating carriage and the cylinder are connected, and together with the elevating carriage When the cylinder descends with respect to the rod, the hydraulic fluid in the upper chamber pushed out by the piston flows into the lower chamber through the liquid passage. The door was regulated by the flow control valve, and the brake is to decelerate the lowering speed of the lifting carriage independently.

  In the drop energy attenuating mechanism of the elevating carriage, one end or both ends of the rod may be fixed to the frame of the vertical conveyance device.

  The flow control valve may be configured such that the throttle is tightened as the height of the lift carriage decreases.

  In the drop energy attenuating mechanism of the elevating carriage, the flow control valve may be selected from a variable throttle valve, a flow rate adjustment valve, a one-way throttle valve, and a throttle valve.

  According to the drop energy attenuating mechanism of the lift carriage of the present invention, the drop energy of the lift carriage can be attenuated only when the lift carriage included in the vertical conveyance device is dropped, and it is not necessary to rely only on the electromagnetic brake.

  Further, according to the mechanism of the present invention, even when a failure occurs in the electromagnetic brake, the falling energy of the lifting carriage can be attenuated, and the impact can be suppressed to a minimum.

  Furthermore, the mechanism of the present invention can be installed independently of the hoisting device related to the vertical conveying device, and is not related to the cable body. Even when the cable body that suspends the cable breaks, the falling energy of the lifting carriage can be lowered while being attenuated.

  Further, when the mechanism of the present invention is applied to a conventional vertical conveyance device, the counter weight is not necessary, and the entire device 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 according to the present invention is applied to a conventional vertical conveyance device, the falling energy of the lifting carriage can be attenuated and the shock absorber can be made relatively compact.

  Hereinafter, a vertical conveying apparatus provided with a drop energy attenuating mechanism for a lifting carriage according to the present invention will be described in detail with reference to the drawings. In the vertical transport apparatus 10 shown in FIGS. 1 and 2, reference numeral 12 denotes a frame standing on the floor F, and a top plate 14 is provided on the top, and a lift carriage 16 is attached to the top plate 14. A hoisting device 18 for raising and lowering is provided. The elevating carriage 16 is connected to a hoisting device 18 via a chain (not shown), and is supported by a guide rail 20 standing on the floor F so as to be raised and lowered. That is, the elevating carriage 16 is lifted by the chain by driving the hoisting device 18, and the elevating carriage 16 rises along the guide rail 20.

  The vertical transfer device 10 includes a drop energy attenuation mechanism 11 for the lift carriage 16 on both sides of the frame 12. Specifically, the drop energy attenuating mechanism 11 includes a rod 24 that extends vertically in the upper end 23a and the lower end 23b of the cylinder 22 and has one end fixed to the floor F and the other end fixed to the frame 12. The pistons 32 for separating the interior of the cylinder 22 into the upper chamber 28 and the lower chamber 30 are fixed in the middle of the rod 24, and the ports 31a and the lower chamber formed on the upper chamber 28 side are formed. A port 31b formed on the 30 side is connected by a liquid passage 34, and a one-way throttle valve 36 is disposed in the liquid passage 34 (see FIG. 3). Oil seals 33 a and 33 b that are in sliding contact with the rod 24 are provided in the sliding openings 26 a and 26 b formed in the cylinder 22, and the cylinder 22 and the rod 24 are sealed to store hydraulic fluid inside the cylinder 22. It can be done. The elevating carriage 16 and the cylinders 22 on both sides are connected by a connecting member 37, and the cylinder 22 slides in the vertical direction as the elevating carriage 16 is raised and lowered.

  In the fall energy absorbing mechanism 11 of this embodiment, as shown in the circuit diagram of FIG. 3, the one-way throttle valve 36 is applied as a flow control valve. However, in the present invention, the flow control valve is a one-way throttle valve 36. Examples of other flow control valves include, but are not limited to, variable throttle valves, throttle valves, and flow rate adjustment valves.

  A tank 40 is connected via a check valve 38 in the middle of the liquid passage 34 connecting the upper chamber 28 and the lower chamber 30 of the cylinder 22 so that the hydraulic fluid can be replenished.

  In the vertical conveying device 10 having the above-described configuration, when the lifting carriage 16 is first lifted from the state shown in FIG. 1 (to the state shown in FIG. 2), the hoisting device 18 is driven to use the chain. The lifting carriage 16 is lifted along the guide rail 20 by lifting the hanging lifting carriage 16. Then, as the elevating carriage 16 is raised, the cylinder 22 connected to the elevating carriage 16 also slides upward. In this process, since the piston 32 is fixed to the rod 24, the volume of the lower chamber 30 of the cylinder 22 decreases and the volume of the upper chamber 28 increases. Therefore, the hydraulic fluid stored in the lower chamber 30 of the cylinder 22 with the volume change of the upper chamber 28 and the lower chamber 30 is pushed out from the port 31b on the lower chamber 30 side by the piston 32 and passes through the liquid passage 34. Thus, it flows into the upper chamber 28 from the port 31a. However, in this case, since the hydraulic fluid passes through the check valve provided in the one-way throttle valve 36 and flows into the upper chamber 28, the flow resistance hardly occurs, and the elevating carriage 16 can be raised smoothly.

  On the other hand, when the elevating carriage 16 is lowered from the state shown in FIG. 2 (to the state shown in FIG. 1), the elevating carriage 16 suspended by the chain is driven by driving the hoisting device 18. It descends along the rail 20. Then, as the elevating carriage 16 is lowered, the cylinder 22 connected to the elevating carriage 16 also slides downward. In this process, since the piston 32 is fixed to the rod 24, the volume of the upper chamber 28 of the cylinder 22 decreases and the volume of the lower chamber 30 increases. Accordingly, the hydraulic fluid stored in the upper chamber 28 of the cylinder 22 with the volume change of the upper chamber 28 and the lower chamber 30 is pushed out from the port 31 a on the upper chamber 28 side by the piston 32 and passes through the liquid passage 34. Thus, it flows into the lower chamber 30 from the port 31b.

  Here, since the one-way throttle valve 36 is disposed in the middle of the liquid passage 34, the flow rate of the working fluid flowing into the liquid passage 34 from the port 31 a on the upper chamber 28 side is regulated by the one-way throttle valve 36. be able to. Then, by using the flow resistance generated by the one-way throttle valve 36, the dropping energy of the elevating carriage 16 can be attenuated. Specifically, when the elevating carriage 16 drops at a high speed due to electromagnetic brake failure, chain breakage, or the like, a rapid flow of hydraulic fluid from the upper chamber 28 to the lower chamber 30 occurs, and this rapid flow causes one direction. By further increasing the flow resistance of the hydraulic fluid passing through the throttle valve 36, the dropping energy of the elevating carriage 16 can be attenuated, and the speed of the elevating carriage 16 falling at a high speed can be reduced.

  As described above, according to the vertical conveyance device 10 including the drop energy attenuation mechanism 11 according to the present embodiment, when the elevating carriage 16 is raised, the working fluid flowing in the upper chamber 28 on the port 31b on the lower chamber 30 side is transferred. Since the flow resistance hardly occurs, the elevating carriage 16 can be raised smoothly. Further, when the lift carriage 16 is lowered, the lift carriage 16 can be smoothly lowered by adjusting the opening of the one-way throttle valve 36 to reduce the flow resistance. Furthermore, when a failure occurs in the electromagnetic brake or the chain is broken, the lifting carriage 16 cannot be braked by the electromagnetic brake, and the lifting carriage 16 falls. However, in this case, a rapid flow of the hydraulic fluid from the upper chamber 28 to the lower chamber 30 occurs, and the flow resistance of the hydraulic fluid passing through the one-way throttle valve 36 further increases due to this rapid flow. The falling energy of the carriage 16 can be attenuated, and the speed of the elevating carriage 16 falling at a high speed can be reduced without depending on only the electromagnetic brake provided in the hoisting device 18. Therefore, even if the elevating carriage 16 falls, the impact can be minimized. Furthermore, since the mechanism 11 can suppress the impact of the lifting carriage 16 from dropping to a minimum, the shock absorber installed below the vertical conveyance 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.

  4A and 4B are circuit diagrams showing another embodiment of the present invention. FIG. 4A shows a state in which the cylinder 22 is positioned above the rod 24, that is, the lifting carriage 16. FIG. 4B shows a state where the cylinder 22 is located below the rod 24, that is, a state where the lifting carriage is located below the vertical conveyance device. ing. The drop energy attenuating mechanism 11a of the lifting carriage shown in the drawing has substantially the same configuration as that of the above-described drop energy attenuating mechanism 11, but a variable throttle valve in which the throttle amount is adjusted by the operation of the roller 42 in the liquid path 34. 44, and a check valve 48 is provided in a bypass liquid passage 35 that bypasses the variable throttle valve 44. A dock 46 is provided below the frame 12 of the vertical transfer device.

  In the vertical conveyance device having the drop carriage attenuating energy attenuating mechanism 11a configured as described above, when the elevation carriage 16 is lowered, as with the vertical conveyance device 10 described above, as the elevation carriage descends, The cylinder 22 connected to the lift carriage also slides downward. In this process, since the piston 32 is fixed to the rod 24, the volume of the upper chamber 28 of the cylinder 22 decreases and the volume of the lower chamber 30 increases. Accordingly, the hydraulic fluid stored in the upper chamber 28 of the cylinder 22 with the volume change of the upper chamber 28 and the lower chamber 30 is pushed out from the port 31 a on the upper chamber 28 side by the piston 32 and passes through the liquid passage 34. Thus, it flows into the lower chamber 30 from the port 31b.

  Here, since the variable throttle valve 44 is disposed in the middle of the liquid passage 34, the hydraulic fluid flowing into the liquid passage 34 from the port 31 a on the upper chamber 28 side always passes through the variable throttle valve 44. . However, when the lifting carriage is lowered above the vertical conveying device, the dock 46 does not act on the roller 42, so the throttle amount of the variable throttle valve 44 is not adjusted, and therefore the lifting carriage is lowered smoothly. Can do. On the other hand, when the elevating carriage is lowered to the vicinity of the lowest position of the vertical conveyance device, or when the elevating carriage is dropped to the vicinity of the lowest position due to a failure of the electromagnetic brake, the dock 46 operates the roller 42. Since the throttle amount of the variable throttle valve 44 is directly adjusted and the flow rate of the working fluid flowing from the port 31a on the upper chamber 28 side into the liquid path 34 is regulated by the variable throttle valve 44, the fall energy of the lifting carriage 16 is attenuated. Can do.

  According to the vertical conveying apparatus including the drop carriage attenuating mechanism 11a for the lift carriage according to the above embodiment, the throttle amount of the variable throttle valve 44 is configured to be tight as the height of the lift carriage decreases. In addition, since the falling energy of the elevating carriage can be performed only in the vicinity of the lowest lowered position related to the vertical conveying device, the elevating carriage can be smoothly lowered above and in the middle of the vertical conveying device. Further, according to the mechanism 11a, the descent speed of the lifting carriage near the lowest position can be reduced to a very low speed, and the impact can be suppressed to the minimum.

  In the vertical conveyance apparatus having the drop energy attenuation mechanism 11a of the lift carriage of this embodiment, when the lift carriage is raised, the cylinder 22 connected to the lift carriage is also moved upward as the lift carriage is lifted. To slide. In this process, the hydraulic fluid stored in the lower chamber 30 of the cylinder 22 is pushed out from the port 31b on the lower chamber 30 side by the piston 32 and flows into the upper chamber 28 from the port 31a through the liquid passage 34. Become. However, in this case, the hydraulic fluid pushed out from the port 31b flows into the bypass liquid passage 35, passes through the check valve, and flows into the upper chamber 28 from the port 31a. The carriage 16 can be raised.

  Further, in the present embodiment, the dock 46 is erected on the floor F and is provided on the frame 12 of the vertical conveyance device. However, the manner in which the dock 46 is installed is not limited to this embodiment. It may be a mode in which it is only erected.

  Furthermore, in the fall energy attenuating mechanism of the present invention, the aspect in which the throttle of the flow control valve becomes tight as the height of the elevating carriage decreases is not limited to the mechanical aspect described above. For example, an electromagnetic mode in which the height of the lift carriage is measured by a length measuring mechanism such as an encoder and the throttle amount of the flow control valve is adjusted by the control device based on the measurement result may be used. Also according to this aspect, it is possible to adjust the throttle amount of the flow control valve according to the height of the lifting carriage, and it is possible to attenuate the falling energy of the lifting carriage.

  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 fall energy attenuation 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.

  Moreover, in embodiment shown in FIG.1 and FIG.2, although the fall energy attenuation | damping mechanism 11 is provided in the both sides of the flame | frame 12, for example, it can also be set as the aspect provided with the said mechanism in the back center part of the flame | frame 12. Is possible. Furthermore, the fixing position of the rod 24 is not particularly limited. For example, both ends may be fixed to the frame 12 or the other end of the rod 24 may be fixed to the ceiling. 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 an embodiment of the present invention, and is a front view showing a state where the lifting carriage is positioned below. It is an embodiment of the present invention, and is a circuit diagram showing a state in which a lift carriage is positioned above. It is a circuit diagram of the fall energy attenuation | damping mechanism of this invention. It is other embodiment of this invention, Comprising: It is a circuit diagram which shows the state which a cylinder is located upwards. It is other embodiment of this invention, Comprising: It is a circuit diagram which shows the state which a cylinder is located below.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10: Vertical conveyance apparatus 11: Fall energy attenuation mechanism 12: Frame 14: Top plate 16: Lifting carriage 18: Hoisting device 20: Guide rail 22: Cylinder 23a: Upper end 23b: Lower end 24: Rod 26a, 26b: Sliding opening 28 : Upper chamber 30: Lower chamber 31a, 31b: Port 32: Piston 33a, 33b: Oil seal 34: Liquid path 35: Bypass liquid path 36: One-way throttle valve (flow control valve)
37: Connecting member 38, 48: Check valve 40: Tank 42: Roller 44: Variable throttle valve (flow control valve)
46: Dock

Claims (3)

In a vertical conveying device including a lifting carriage that is lifted and lowered by a hoisting device and a brake that brakes the lifting carriage , a mechanism that attenuates fall energy of the lifting carriage,
At the upper and lower ends of the cylinder that can store the working fluid, a sliding port is formed through which a rod extending in the vertical direction is inserted.
A piston that separates the inside of the cylinder into an upper chamber and a lower chamber is fixed in the middle of the rod,
Connect the upper and lower chambers with a liquid channel,
A flow control valve is disposed in the liquid passage;
Connecting the lift carriage and the cylinder;
The flow control valve regulates that the hydraulic fluid in the upper chamber pushed out by the piston flows into the lower chamber through the liquid passage when the cylinder is lowered with respect to the rod together with the lift carriage. ,
A falling energy attenuating mechanism for an elevating carriage characterized by decelerating a descending speed of the elevating carriage independently of the brake . The fall energy attenuating mechanism of the lifting / lowering carriage according to claim 1, wherein the flow control valve is configured such that the throttle becomes tighter as the height of the lifting / lowering carriage becomes lower. The fall energy attenuation mechanism for a lift carriage according to claim 1 or 2, wherein the flow control valve is selected from a variable throttle valve, a flow rate adjustment valve, a one-way throttle valve, and a throttle valve.

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