JP4530708B2 - Elevator shock absorber - Google Patents

Description

  The present invention relates to an impact buffering device for an elevator that mitigates an impact caused by a lowering of an elevator car.

  As shown in FIG. 7, the conventional general shock absorber for an elevator is provided with a return confirmation switch for notifying the elevator control panel of the recovery state after the car is abnormally lowered. Specifically, the shock absorber 100 includes a hydraulic shock absorber main body 105A that includes a cylinder 102 and a plunger 103 in a pit at the bottom of a hoistway just below the elevator car 101, and a spring 104 inside. Further, a cam mounting arm 106 is mounted from the upper part of the plunger 103 to the side, and a cam rod 107 is suspended downward from the arm end side. Further, a return confirmation switch 108 is attached to the upper side surface of the cylinder 102 and is always on, but resists the hydraulic pressure and spring pressure by the plunger 103 of the hydraulic shock absorber main body 105A when the car 101 is abnormally lowered. While gradually contracting, the cam rod 107 descends accordingly, and the return confirmation switch 108 is set to the OFF state. In response to the turn-off signal from the return confirmation switch 108, the elevator control panel cuts off the power.

  Thereafter, when the car 101 on the plunger 103 is raised to the normal operation area by restoration work or the like, and when the plunger 103 returns to the original extended position by hydraulic pressure or spring pressure, the cam rod 107 is raised and the return confirmation switch 108 is turned on. Switch to the on state. When the elevator control panel receives an ON signal from the return confirmation switch 108, the elevator control panel determines that it has returned to a normal state, turns on the power, and allows normal operation of the car 101. That is, when the plunger 103 returns to the extended position and the car 101 returns to the state where the safe stop is possible, the car 101 can be normally operated.

  By the way, the shock absorber used for the super-high speed elevator is a shock absorber main body 105B having a multi-stage connected plunger as shown in FIG. 8 in order to simultaneously achieve downsizing of the device and an increase in the stroke length of the plunger. Is used.

  As shown in FIG. 12 (a), the shock absorbing device having the multistage connection type plunger is constituted by a shock absorber main body 105B in which a multistage connection type plunger 103a, 103b, 103c is connected to the upper part of the cylinder 102, and the hoistway is located at the top of the hoistway. The cam mounting arm 106 is attached to the uppermost plunger 103a, and the cam rod 107 is suspended from the distal end side of the cam mounting arm 106. Since other configurations are the same as those in FIG. 7, the same components are denoted by the same reference numerals, and the description thereof is omitted.

  In such a device, it is possible to absorb the impact associated with the lowering of the car 101 by the multistage connected plungers 103a, 103b, 103c when the car of the super high speed elevator is abnormally lowered. As shown in b), since the cam rod 107 is lengthened by the length of the stroke of the multi-stage connected plungers 103a, 103b, 103c, there is a problem that the tip of the cam rod 107 interferes with the installation surface 109 of the cylinder 102.

Therefore, conventionally, in order to solve the above problems, an impact buffering device as shown in FIG. 9 has been proposed (Patent Document 1).
In this shock absorbing device, a supporting and fixing portion 110 is installed on the mounting side of the cam mounting arm 106, which is one side of the upper portion of the cylinder 102, and the cam mounting arm 106 mounted on the uppermost plunger 103a is flexible from the tip side. After suspending the long body 111, it is returned to hold the movable pulley 112 from the lower side and fixed to the support fixing portion 110, and the movable pulley 112 is moved up and down in accordance with the expansion / contraction operation of the shock absorber main body 105C. The return confirmation switch 108 is turned on / off as the movable pulley 112 moves up and down. Since other configurations are the same as those in FIGS. 7 and 8, the same components are denoted by the same reference numerals, and the description thereof is omitted.

With the configuration as described above, the moving pulley 112 based on 2: 1 roping is used, and the stroke of the moving pulley 112 is half of the stroke of the shock absorber main body 105C. No interference with the installation surface 109.
JP 2003-292262 A

  However, in the shock absorber as described above, immediately after the operation of the shock absorber main body 105C due to an abnormal descent of the car or the like, the flexible elongated body 111 is sent downward at the operation speed of the shock absorber main body 105C. On the other hand, since the movable pulley 112 is free-falling, a speed difference is generated between the flexible elongate body 111 and the movable pulley 112, and the flexible elongate body 111 is in a slack state and returned. There is a risk of being caught by peripheral products including the confirmation switch 108.

  Further, in the shock absorbing device having the multistage-coupled plungers 103a, 103b, 103c, the stroke of the shock absorber main body 105C is periodically measured to manage whether or not the predetermined reference value is reached. Since the main body 105C is long, there is a problem that the stroke of the shock absorber main body 105C is difficult to measure.

  The present invention has been made in view of the above circumstances, and is an elevator that prevents a flexible elongated body from being caught by peripheral products when the shock absorber main body is contracted, and can quickly measure a stroke related to the shock absorber main body. An object is to provide an impact buffering device.

In order to solve the above-described problems, the present invention provides a shock absorber main body that is installed in a pit of a hoistway and a plurality of plungers are connected to the upper part of a cylinder, one end is fixed to the uppermost plunger side, and the other end is A flexible elongated body fixed to a fixed portion set at a position corresponding to the cylinder upper portion, and at least one movable pulley set to be held from the lower side by an intermediate portion of the flexible elongated body; in the shock absorbing device provided with a return confirmation switch that operates in response to the vertical position of the movable pulley, setting only being on the upstream side or downstream side of the movable pulley, when the plunger contracts due to the operation of the shock absorber body, the The catch of the peripheral article including the return confirmation switch due to the slack of the flexible elongated body due to the difference in speed between the delivery speed of the flexible elongated body due to the contraction and the free fall speed of the movable pulley To avoid, a ring-shaped guide body for guiding the flexible long member, a shock absorbing device provided with a distance converting means for converting the distance measuring the rotational speed of the movable pulley.

  With this configuration, when the plunger is contracted by the operation of the shock absorber main body, the flexibility is determined by the speed difference between the flexible long-body feeding speed and the free-falling speed of the movable pulley. For example, if a ring-shaped guide body is provided on the downstream side of the moving pulley, the flexible long body will not loosen and jump near the peripheral equipment including the return confirmation switch. It becomes possible to avoid catching peripheral products including the switch.

  In addition, when the ring-shaped guide body is provided on the upstream side of the movable pulley, when the plunger contracts due to the operation of the shock absorber main body, the flexible long body may temporarily protrude outside the ring-shaped guide body. Since it acts so as to dislodge the protruding part to the outside in accordance with the free fall of the movable pulley, it becomes possible to avoid the catching of peripheral products including the return confirmation switch by the flexible elongated body.

  If an inverted conical guide body is provided instead of the ring-shaped guide body that guides the flexible elongated body, the flexible elongated body is temporarily moved when the plunger contracts due to the operation of the shock absorber body. By storing in a serpentine shape on the wide upper part of the frontage and feeding it downward, the flexible elongate body does not sag and jump, and it is possible to avoid catching peripheral products including the return confirmation switch. .

According to the present invention, if a distance conversion means for measuring the rotation speed of the moving pulley and converting it into a distance is provided in the above configuration, the stroke such as when the multistage connecting plunger is contracted and the like are provided without providing a scale for measurement. The stroke to be measured can be measured.

  Also provided is a distance converting means for measuring the number of rotations of the moving pulley and converting it into a distance, and means for multiplying the distance converted by the converting means by the number of ropings of the flexible elongated body with respect to the moving pulley and displaying it. For example, the stroke required when the multistage connecting plunger contracts or other required strokes can be measured immediately from the display result.

  According to the present invention, by providing a guide for a flexible elongated body, the flexible elongated body is not caught by peripheral products including a switch when the shock absorber body contracts, and a stroke related to the contraction of the shock absorber body. Thus, it is possible to provide an impact shock absorber for an elevator that can measure the speed quickly.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a configuration diagram showing an embodiment of an elevator shock absorber according to the present invention.

  The shock absorber includes, for example, a shock absorber main body 4 in which multistage-coupled plungers 2 a, 2 b, 2 c are connected to an upper portion of a hydraulic cylinder 1 to absorb a load shock due to an abnormal drop of the car 3, and a lower side from the upper portion of the cylinder 1. For example, the L-shaped support member 5 bent to the upper end of the cam mounting arm 6 attached to the top of the uppermost plunger 2a and the other end of the support member 5 are almost the same height as the cylinder 1. A flexible elongated body 8 fixed to a support fixing portion 7 provided on the support member 5 at a position, for example, a limit switch fixed to, for example, one side of the cylinder 1 within the height range of the cylinder 1 The return confirmation switch 9 and the flexible elongate body 8 supported so as to hang down from the cam mounting arm 6 and the support fixing portion 7 are set so as to be held from below. It is constituted by a movable pulley 10 serving as a switch controller element.

  Further, in the shock absorbing device, the support member 5 attached in the vicinity of the return confirmation switch 8 within the height range of the cylinder 1 surrounds the flexible long body 8 that reaches the support fixing portion 7 through the movable pulley 10. A ring-shaped guide body 11 is attached for guiding.

  The ring-shaped guide body 11 is attached so as to guide the flexible elongated body 8 located on the downstream side of the moving pulley 10, but may be attached on the upstream side of the moving pulley 10 as indicated by a dotted line 11 a in the figure.

  As described above, the support fixing portion 7 can be fixed to the cylinder 1 via the support member 5 or attached to the hoistway wall (not shown) via an attachment member (not shown). is there. Further, the return confirmation switch 9 and the guide bodies 11 and 11a can also be attached to a hoistway wall (not shown) via an attachment member (not shown).

  Next, the operation of the shock absorber as described above will be described.

  For example, when the car 3 is abnormally lowered for some reason and hits the upper surface of the uppermost plunger 2a, the plungers 2a to 2c contract under the load of the car 3 that is lowered. At this time, the flexible elongate body 8 is lowered by a dimension corresponding to the contraction stroke based on the contraction of the plungers 2a to 2c, and the movable pulley 10 is also lowered accordingly. At this time, the movable pulley 10 tries to descend to absorb the descending dimension of the flexible elongated body 8, but the flexible elongated body 8 is lowered on the lower side so as to descend at the contraction speed of the plungers 2a to 2c. Since the moving pulley 10 is free-falling while being sent in the direction, a speed difference is generated between the two and the moving pulley 10 is temporarily floated. Here, the flexible elongate body 8 whose tension is not applied to the lower side is loosened. However, the flexible elongate body 8 is guided by the guide bodies 11 and 11a so as to suppress the jumping of the slackened flexible elongate body 8. Therefore, the flexible elongate body 8 is not caught by peripheral products including the return confirmation switch 9.

  Therefore, according to the embodiment as described above, by attaching the guide body 11 so as to surround the flexible elongated body 8 located on the upstream side or the downstream side of the movable pulley 10, the flexible elongated body is provided. Even if 8 loosens, peripheral products including the return confirmation switch 9 are less likely to get entangled. As a result, the return confirmation switch 9 can be operated accurately and reliably, and damage to the flexible elongated body 8 can be reduced. .

  FIG. 2 is a main part configuration diagram showing another embodiment of an elevator shock absorber according to the present invention.

In this embodiment, an inverted conical guide body 11b is used instead of the ring-shaped guide bodies 11 and 11a.
The elevator shock absorber has substantially the same configuration as that shown in FIG. 1, and therefore, the same components are denoted by the same reference numerals, detailed description thereof will be given to the description of FIG. That is, in this shock absorbing device, a mounting support member 5a protrudes from one side of the cylinder 1, the aforementioned L-shaped support member 5 or a hoistway wall (not shown), and the tip of the mounting support member 5a. An inverted conical guide body 11b is attached to the side. The inverted conical guide body 11b is formed in a funnel shape having a wide upper opening serving as a flexible elongated body receiving portion and having a diameter reduced toward the lower side. The flexible elongate body 8 that descends in response to the contraction of 2c is temporarily absorbed in a meandering manner, and at the same time, the flexible elongate body 8 is dropped as the movable pulley 10 is dropped from the lower side cylindrical body of the inverted conical guide body 11b. The body 8 is lowered.

  Therefore, according to such an embodiment, the inverted conical guide body 11b formed in a funnel shape on one side of the cylinder 1, the above-described L-shaped support member 5 or hoistway wall (not shown) is provided. Since the flexible elongated body 8 is suspended so as to pass through the inverted conical guide body 11b, the flexible elongated body 8 is lowered by the contraction of the plungers 2a to 2c due to the lowering of the car 3. Is received by the wide conical inverted conical guide body 11b, the flexible elongated body 8 does not protrude outside, and there is no situation where it is entangled with peripheral products, and the reliability as a guide can be improved. Moreover, since the flexible elongate body 8 descend | falls following the fall of the moving pulley 10, the flexible elongate body 8 can be dropped stably. Furthermore, damage to the flexible elongated body 8 can be reduced.

  In addition, in the said embodiment, although the material of the ring-shaped guide bodies 11 and 11a and the inverted conical guide body 11b is not specified, if it forms with resin-made materials, such as urethane, for example, the flexible elongate body 8 will be shown. Even when the ring contacts the ring-shaped guide bodies 11 and 11a and the inverted conical guide body 11b, damage to the flexible elongated body 8 can be suppressed.

  FIG. 3 is a block diagram showing still another embodiment of the elevator shock absorber according to the present invention. In the figure, the same or equivalent parts as in FIG. 1 will be described using the same reference numerals.

  In this elevator shock absorber, a multistage-coupled plunger 2a, 2b, 2c is connected to the upper part of the cylinder 1, and a shock absorber body 4 that absorbs a load shock due to an abnormal drop of the car 3, and from the upper part of the cylinder 1 to the lower side. For example, the bent L-shaped support member 5 and one end of the support member 5 are suspended from the tip of the cam mounting arm 6 mounted on the uppermost plunger 2a. A flexible long body 8 fixed to a support fixing portion 7 provided on the support member 5, a return confirmation switch 9 such as a limit switch fixed to one side of the cylinder 1, and a flexible length The movable pulley 10 has a function of a switch controller set so as to be held by the scale 8 from below.

  Further, in the shock absorbing device, a measuring scale 12 with a soft scale having a length longer than at least the stroke of the multistage-coupled plungers 2a, 2b, 2c is suspended from the distal end side of the cam mounting arm 6. The measuring scale 12 is provided with a scale that starts from the mounting surface of the cam mounting arm 6 of the flexible long body 8 or the upper surface of the uppermost plunger 2a and becomes larger toward the lower side. Therefore, the strokes of the multistage connected plungers 2a, 2b, 2c can be measured instantaneously.

  Therefore, according to the above configuration, when the car 3 descends due to some factor and hits the upper surface of the uppermost plunger 2a, the plungers 2a to 2c contract under the load of the descending car 3. Along with the contraction of the plungers 2a to 2c, the measuring scale 12 attached to the distal end side of the cam mounting arm 6 is also lowered, and the stroke of the shock absorber body 4 due to the contraction of the plungers 2a to 2c can be measured. Since only the scale of the measuring scale 12 is read from the side, the strokes of the multistage-coupled plungers 2a, 2b, 2c can be measured quickly during regular inspection.

  Next, FIG. 4 is a block diagram showing still another embodiment of the elevator shock absorber according to the present invention. In the figure, the same or equivalent parts as in FIG. 1 will be described using the same reference numerals.

  In this embodiment, a scale 13 is affixed to the outer casing of the cylinder 1 near the section where the movable pulley 10 moves up and down, and the scale 13 corresponding to the lowermost surface of the movable pulley 10 during normal operation of the car 3 is indicated. The vertical movement stroke of the moving pulley 10 can be measured from the value and the indicated value of the scale 13 corresponding to the lowermost surface of the moving pulley 10 when the shock absorber body 4 is operated by the car descent.

  Accordingly, the car 3 descends due to some factor, hits the upper surface of the uppermost plunger 2a, and the plungers 2a to 2c contract under the load of the car 3 that descends. Along with the contraction of the plungers 2a to 2c, the flexible long body 8 attached to the distal end side of the cam attachment arm 6 is lowered, and the movable pulley 10 is lowered accordingly. As a result, the scale 13 corresponding to the last lowermost surface of the movable pulley 10 when the plungers 2a to 2c are contracted by receiving the indication value of the scale 13 corresponding to the first lowermost surface of the movable pulley 10 and the load of the car 3. If the difference from the indicated value is read, the vertical movement stroke of the movable pulley 10 can be measured quickly and accurately.

  In the above embodiment, the scale 13 is pasted on the outer casing of the cylinder 1. However, the scale 13 may be directly written on the casing of the cylinder 1, which is cheaper and saves space. Easy to implement.

  FIG. 5 is a block diagram showing still another embodiment of the elevator shock absorber according to the present invention. In the figure, the same or equivalent parts as in FIG. 1 will be described using the same reference numerals.

  In this embodiment, the measuring scale 12 or the like is not provided separately from the flexible elongated body 8, but a scale 14 is attached to the flexible elongated body 8 itself, or the flexible elongated body. By writing the scale 23 directly on the 8 itself, in addition to the function of the original flexible elongated body 8 shown in FIG. 1, the stroke related to the expansion / contraction of the multistage connected plungers 2a to 2c by expansion / contraction is measured. The function to do can be given.

  That is, the car 3 descends for some reason, hits the upper surface of the uppermost plunger 2a, and when the plungers 2a to 2c contract under the load of the descending car 3, the scale 14 is attached along with the contraction. Since the flexible elongated body 8 also descends, the stroke of the contracted plungers 2a to 2c can be easily made from the scale 14 of the flexible elongated body 8 by reading the scale 14 of the lowered flexible elongated body 8. Can be read.

  FIG. 6 is a block diagram showing still another embodiment of the elevator shock absorber according to the present invention. In the figure, the same or equivalent parts as in FIG. 1 will be described using the same reference numerals.

  This elevator shock absorber is attached to the rotating shaft of the moving pulley 10 having the configuration shown in FIG. 1, and a pulley tachometer 21 for measuring the rotation speed of the moving pulley 10, and the rotation speed measured by the pulley tachometer 21. A distance conversion means 22 for calculating a distance corresponding to a stroke caused by the contraction of the plungers 2a to 2c from the circumference obtained from the above, and a display section 23 for displaying a digital or analog distance calculated by the distance conversion means 22. Is provided.

  In such a configuration, when the car 3 descends due to some factor, hits the upper surface of the uppermost plunger 2a, and receives the load of the descending car 3, the plungers 2a to 2c contract, so that the flexible The long elongate body 8 is also lowered, and the movable pulley 10 rotates in contact with the guide roller 24 as the flexible elongate body 8 is lowered. When the moving pulley 10 rotates, the pulley tachometer 21 measures the rotational speed of the moving pulley 10 and sends it to the distance converting means 22. Here, the distance conversion means 22 calculates a distance corresponding to the stroke caused by the contraction of the plungers 2 a to 2 c from the circumference of the movable pulley 10 and displays it on the display unit 23. Reference numeral 25 denotes a box-shaped housing that rotatably supports the movable pulley 10 and the guide roller 24.

  Therefore, according to the embodiment as described above, the plungers 2a to 2c contract under the load of the descending car 3, and the movable pulley 10 rotates as the flexible long body 8 descends. Since the distance corresponding to the stroke caused by the contraction of the plungers 2a to 2c is calculated from the speed of the moving pulley 10 and displayed, the display result can be recognized at a glance and the stroke measurement work is improved. Moreover, if the distance calculation result is latched, the stroke when the plungers 2a to 2c contract later can be grasped, and the position of the uppermost plunger 2a can be known from the distance.

  Further, as another embodiment, a roping multiplication unit 26 is connected to the output side of the distance conversion unit 22 as shown by a dotted line in FIG. 6, and the distance obtained by the distance conversion unit 22 is flexible. Since the distance can be calculated more accurately by multiplying the number of ropings of the long body 8 with respect to the movable pulley 10, the value obtained by multiplying the number of ropings may be displayed on the display unit 23.

  Therefore, according to the embodiment as described above, the distance obtained by the distance converting means 22 is multiplied by the predetermined number of ropings, so that it is not necessary to consider the number of ropings, and the stroke measurement work can be further improved. it can.

  In addition, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, in the above-described embodiment, an example in which one moving pulley 10 is used has been described. However, a configuration in which two or more moving pulleys 10 are held by the flexible elongated body 8 may be used.

  Further, the embodiments can be implemented in combination as much as possible, and in that case, the effect of the combination can be obtained. Further, each of the above embodiments includes various higher-level and lower-level inventions, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, when an invention is extracted because some constituent elements can be omitted from all the constituent elements described in the means for solving the problem, the omitted part is used when the extracted invention is implemented. Is appropriately supplemented by well-known conventional techniques.

The block diagram which shows one Embodiment of the shock absorber of the elevator which concerns on this invention. FIG. 3 is a diagram showing an example in which an inverted conical guide body is used instead of the ring-shaped guide body shown in FIG. The block diagram which shows other embodiment of the shock absorber of the elevator which concerns on this invention. The block diagram which shows other embodiment of the shock absorber of the elevator which concerns on this invention. The block diagram which shows other embodiment of the shock absorber of the elevator which concerns on this invention. The block diagram which shows other embodiment of the shock absorber of the elevator which concerns on this invention. The block diagram of the impact shock absorber of the conventional elevator. The block diagram of the impact buffering device using the conventional multistage connection type plunger. The block diagram of the impact buffering device at the time of using the conventional multistage connection type plunger and using the flexible elongate body 8. FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Cylinder, 2a-2c ... Multistage connection type plunger, 3 ... Riding car, 4 ... Shock absorber main body, 6 ... Cam mounting arm, 7 ... Fixed part, 8 ... Flexible long body, 9 Return confirmation switch, 10 ... moving pulley, 11, 11a ... ring-shaped guide body, 11b ... inverted conical guide body, 12 ... measuring scale with scale, 13, 14 ... scale, 21 ... pulley tachometer, 22 ... distance conversion means, 23 ... display section , 26 ... roping multiplication unit.

Claims (3)

A shock absorber body that is installed in the pit of the hoistway and has a plurality of plungers connected to the upper part of the cylinder, and a fixed part in which one end is fixed to the uppermost plunger side and the other end is set to a position corresponding to the cylinder upper part The flexible long body to be fixed, at least one moving pulley set to be held from the lower side by the intermediate portion of the flexible long body, and operated according to the vertical position of the moving pulley In the shock absorber provided with the return confirmation switch,
The setting only being on the upstream side or downstream side of the movable pulley, the shock absorber when the plunger contracts due to the operation of the main body, the speed difference between the free-fall velocity of the velocity and the movable pulley feeding of the flexible long member by the contraction A ring-shaped guide body for guiding the flexible elongate body so as to avoid catching of peripheral products including the return confirmation switch due to the slack of the flexible elongate body,
An impact buffering device comprising a distance converting means for measuring the number of rotations of the movable pulley and converting it into a distance . A shock absorber body that is installed in the pit of the hoistway and has a plurality of plungers connected to the upper part of the cylinder, and a fixed part in which one end is fixed to the uppermost plunger side and the other end is set to a position corresponding to the upper part of the cylinder. The flexible long body to be fixed, at least one moving pulley set to be held from the lower side by the intermediate portion of the flexible long body, and operated according to the vertical position of the moving pulley In the shock absorber provided with the return confirmation switch,
When the plunger is retracted by the operation of the shock absorber main body provided on the upstream side or the downstream side of the moving pulley, due to the speed difference between the feeding speed of the flexible elongated body due to the contraction and the free fall speed of the moving pulley An inverted conical guide body that guides the flexible elongated body so as to avoid catching of the peripheral article including the return confirmation switch due to the slack of the flexible elongated body;
An impact buffering device comprising a distance converting means for measuring the number of rotations of the movable pulley and converting it into a distance . The shock absorbing device according to claim 1 or 2,
An impact buffering device further comprising means for multiplying and displaying the distance converted by the distance converting means by the number of ropings of the flexible elongated body relative to the moving pulley .

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