KR102594345B1 - Cage fall prevention test device for vertical wheelchair lift - Google Patents

Abstract

The present invention is to provide a cage fall prevention part test device of a vertical wheelchair lift, which can check whether a fall prevention part is normally operated through a simple test, wherein the fall prevention part prevents a fall by braking a cage when a case towing rope is loosened or ruptured in a rope hoisting type wheelchair lift, to allow a worker or an inspector to have no need of boarding a cage by himself or herself, thereby obtaining safety due to safety inspection and drastically increasing efficiency and productivity of a work due to a fall prevention part test at the same time.

Description

Cage fall prevention device for vertical wheelchair lift {CAGE FALL PREVENTION TEST DEVICE FOR VERTICAL WHEELCHAIR LIFT}

The present invention is a vertical wheelchair lift that raises or lowers the cage by pushing up or lowering the rope with a hydraulic cylinder, and allows visual confirmation through a simple test whether the fall prevention part of the cage is operating normally when the rope is relaxed or broken. This relates to a cage fall prevention test device.

In a general elevator, a cage is hung on one end of a rope that is lowered by winding the pulley of a traction machine several times, and a balance weight is hung on the other end of the rope. When you press the floor selection button according to the rotation direction of the pulley, the cage is raised, the balance weight is lowered, and the cage is lowered. The descent and rise of the balance weight were repeated.

All elevators are inspected periodically or frequently for safety in accordance with the Elevator Safety Management Act, taking into account safety issues that may arise due to aging of ropes and wear of pulleys due to long-term operation, and replacement of ropes or pulleys according to the inspection results. Maintenance work, etc. must be performed. The safety inspection of the elevator includes measuring the tension of the rope and the traction force of the cage, and checking whether the fall prevention unit is operating normally.

The elevator rope tension and traction measuring device of Registered Patent No. 10-2143284 includes a plate-shaped measuring body installed on a plurality of ropes, three support rollers that protrude in an exposed state from one surface of the measuring body and are inserted into the ropes, and , Measuring means consisting of a load cell connected to one of the support rollers to sense the tension of the rope, and terminal means connected to the measuring means to calculate and display the rope tension and traction force based on data values measured by the load cell. do.

The measuring means consists of a first measuring means mounted on one rope among the ropes and a second measuring means mounted on the other rope, and the terminal means measures the measured value by the first measuring means and the second measuring means. Convert to an average value to calculate the tension and traction force of the rope to determine whether the rope is abnormal and whether the pulley is worn.

However, in the prior art, it is impossible to conduct a test run to visually check whether the fall prevention unit, which prevents the fall of the cage due to loosening or cutting of the rope, is operating normally, and a device for measuring the tension of the rope and the traction force of the cage is not possible. It is structurally complex and has high measurement difficulty, making it unsuitable for use as a wheelchair elevator inspection device.

On the other hand, in a wheelchair elevator, rails are installed on opposite sides of a pair of vertical struts standing side by side or on the front of each strut to guide the platform to safely ascend and descend, and the elevator platform is raised and lowered by hydraulic cylinders fixed to the bottom of the props. It is common. Wheelchair elevator broadly includes wheelchair lifts.

Among the wheelchair lifts, a hoistway for the cage is secured within a mast made of steel, a vertical electric cylinder equipped with a pulley at the top of the piston is installed on the mast, and the cage is stored within the mast to raise and lower with a low pro. The rope is hung on a pulley in a ∩ shape so that when the piston rises, the rope portion on the cage side pushes up and pulls up the cage, and when the piston recovers, the cage lowers the rope by its own weight.

In this type of wheelchair lift, it is sufficient for the cage to go up and down the ground floor and the normal second-floor platform, so the rope used here is incomparably shorter and has a simpler structure than the rope of a general elevator.

Nevertheless, before installation, a new wheelchair lift requires a preliminary inspection to check whether the rope is loose and whether it is installed properly, and after installation, it is necessary to check whether the rope is loosened during the operation process, whether the wire is cut, whether the rope is cut, etc., according to the Elevator Safety Protection Act. Safety inspections must also be conducted.

In wheelchair lifts, the internal space of the cage makes it very inconvenient for the inspector to move around to check for any abnormalities in the fall prevention part of the cage, and above all, the cage must actually fall while the operator or inspector is on the cage, so it is difficult to experience a fall. Safety accidents occurred frequently due to the safety inspection of the prevention department.

In this regard, a test device is needed that can easily check from the outside whether the cage fall prevention part is operating normally.

Registered Patent No. 10-2143284

The present invention allows the normal operation of the fall prevention unit, which applies the brakes to the cage to prevent falls when the cage traction rope is relaxed or ruptured in a rope hoisting wheelchair lift, to be checked through a simple test, so that the operator or inspector does not directly board the cage. The purpose of this study was to provide a cage fall protection test device for a vertical wheelchair lift that can significantly improve the efficiency and productivity of work according to the fall protection test while ensuring safety according to safety inspection since it is not required.

In order to achieve the above object, the present invention includes a mast secured with a hanger hoistway and rails installed on both inner walls, a hanger as a substitute for a cage, a hydraulic cylinder installed with a pulley for draping a traction rope on the top of the piston, and the above. A two-strand traction rope is wound around a pulley in a ∩ shape, one end is fixed to the hanger, the other end is installed at the base of the mast and fixed to a balance load replacing the balance weight, and a fall rope is installed on both sides of the mast, respectively. A wheelchair lift module including a prevention portion, a link shaft installed below the rope end of the traction rope fixed to the hanger, a link installed on the link shaft, and a tension spring connecting the inner end of the hanger and the link; A plurality of guide rolls each installed at a vertex of a base side of a virtual isosceles triangle below the rope end of the traction rope, a tension wire whose both ends passing through the plurality of guide rolls are fixed to the rope end of the traction rope, and A cage for a vertical wheelchair lift, characterized by an electric cylinder that pulls up and tensions a tension wire, an inner end of the link rotating around the link axis to operate a detection switch, and an outer end to operate a fall prevention unit. It can be implemented as a fall prevention test device.

In addition, the tension wire uses the rope end on the hanger side of the towing rope as the vertex of an isosceles triangle, passes through a plurality of guide rolls installed at the vertex of the base of the isosceles triangle below the rope end, and then both ends are pulled. Each is fixed to the rope end of the rope, and the middle part of the tension wire is fixed to the upper end of the rod of the electric cylinder so that the tension of the tension wire can be adjusted.

In addition, the link axes are a pair, and the links are installed symmetrically for each link axle, so that when the tension of the tension wire is released, the inner end of the link that rotates around the link axis driven by the tension spring is lowered to activate the detection switch. It is characterized by being able to stop the operation of the hydraulic cylinder by pressing it.

In addition, when the tension of the tension wire is released, the outer end of the link, which is driven by the tension spring and rotates around the link axis, rises to operate the fall prevention unit to prevent the hanger from falling. Characterized by a pair of wedges that are coupled to the outer end of the link and installed symmetrically with the rail between them, and a pair of wedge blocks that are tapered to narrow the gap when the pair of wedges rises and enters. do.

In addition, the balance load includes an anchor that anchors the other end of the traction rope that hangs over the upper pulley of the piston of the hydraulic cylinder, a spring rod formed at the bottom of the anchor, a pressure plate loosely fitted under the base of the mast, and a compression spring for pressing the pressure plate. It is characterized by being made by doing this.

In designing a wheelchair lift, the cage fall prevention device for the vertical wheelchair lift of the present invention uses a wheelchair lift module to simply simulate the relaxation or breakage of the traction rope, which is difficult to visually check because it is hidden by the wall of the cage. It can be easily determined through testing.

By doing so, it is possible to accurately set the installation location of the cage fall prevention unit, accurately determine whether the fall prevention unit is functioning properly, find areas for improvement in advance, and reflect them in the design to provide a high-quality, high-quality wheelchair lift.

In addition, the normal operation of the fall prevention unit is checked within a narrow cage, and there is no need to inspect and test the fall prevention unit while the worker or inspector is riding in the cage, thereby preventing safety accidents in advance and improving safety as well as falls. There is a useful effect of increasing the efficiency of inspection and testing work in the prevention department.

Figure 1 is a front illustration showing the installation state of the cage fall prevention test device of the vertical wheelchair lift according to the present invention.
Figure 2 is a front illustration showing a state before the electric cylinder, which is the main part of the cage fall prevention test device for the vertical wheelchair lift according to the present invention, is operated.
Figure 3 is an exemplary side view of Figure 2.
Figure 4 is a front illustration showing an operating state of the electric cylinder, which is the main part of the cage fall prevention device for the vertical wheelchair lift according to the present invention.
Figures 5a and 5b are side views showing the state before and after operation of the cage fall prevention unit of the wheelchair lift according to the present invention.
Figure 6 is a front illustration showing an enlarged balance load, which is an important part of the cage fall prevention unit test device of a wheelchair lift according to the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings prepared based on a preferred embodiment.

Figure 1 is a front illustration showing the installed state of the cage fall prevention test device of the vertical wheelchair lift according to the present invention, and Figures 2 and 3 are the state before testing the fall prevention test device, that is, generally. This is an example front and side view depicting a state in which tension is applied by tensioning a tension wire with an electric cylinder, assuming that the wheelchair lift is operating.

As shown, the cage fall prevention device for the vertical wheelchair lift according to the present invention includes a mast (1) secured with a hanger hoistway and rails (9) installed on both inner walls, a hanger (2) as a substitute for the cage, and , a hydraulic cylinder (3) installed on the top of the piston (6) with a pulley (7) for draping the traction rope, and the pulley (7) is wound in a ∩ shape and one end is fixed to the hanger (2), The other end is a two-strand traction rope (4) installed at the base of the mast (1) and fixed to the balance load (10) replacing the balance weight, and a fall prevention unit (5) installed on the side of the mast (1). It is a wheelchair lift module that includes.

A link shaft 30 installed below the rope end of the traction rope 4 fixed to the hanger 2, a link 31 installed on the link shaft 30, and the floor and link of the mast 1 ( A tension spring 32 connecting the inner end of the traction rope 4, a plurality of guide rolls 21 each installed at the vertices of the base of a virtual isosceles triangle below the rope end of the traction rope 4, and the plurality of guides A tension wire (20) whose both ends via a roll (21) are fixed to the rope end of the traction rope (4), an electric cylinder (50) for pulling up and tensioning the tension wire (20), and the link shaft The inner end of the link 31 rotating around (30) operates the detection switch 40, and the outer end operates the fall prevention unit 5.

That is, the wheelchair lift module is made of steel and has a mast (1) secured inside with a hanger hoistway for a cage, a hanger (2) for a cage, and a traction rope hanger at the top of the piston (6) in the mast (1). A hydraulic cylinder (3) for lifting a hanger on which a maceration pulley (7) is installed, and one end of a traction rope (4) wound around the pulley (7) are fixed to the hanger (2) and the inner surface of the mast (1) and the hanger. It is equipped with a normal cage fall prevention part (5) installed between the sides of (2).

In addition, the hanger (2) is vertically lifted and lowered while being guided by a rail (9) attached to a pillar erected at the corner of the mast (1) resembling a rectangular box.

The hydraulic cylinder (3) is a driving means installed in the mast (1) to raise or lower the traction rope (4) with a piston (6) to raise and lower the hanger (2).

The traction rope (4) is provided with two strands of a certain length, wound around the pulley (7) of the piston (6) in a square shape and stretched on both sides, one end of the stretched strand is fixed to the hanger (2), and the opposite side The other end of the stretched strand is fixed to the balance load (10).

At this time, as shown in FIG. 6, the balance load 10 is a spring rod 12 extending downward from the anchorage 11 where the other end of the traction rope 4 is fixed at the bottom of the mast 1. The load cell (13) is installed under the base (8) while penetrating loosely downward through the installed base (8), and the load cell pressure plate (14) is loosely inserted into the spring rod (12) below the load cell (13) to attach it to the load cell (13). A balance weight substitute for a general elevator that measures the tension of the traction rope (4) using the pressing force and prevents the load cell (13) from breaking away by loading a compression spring (15) on the spring rod (12) under the pressure plate (14). It was done with

Both ends of one tension wire (20) are connected to the rope ends of the two-strand traction rope (4) fixed to the hanger (2), and a virtual isosceles triangle with the rope end of the traction rope (4) as its vertex. A plurality of guide rolls 21 are installed at the corners on both sides of the bottom, respectively, so that the tension wire 20 passes through them.

That is, one end of the tension wire 20 is fixedly connected to the rope end of one of the two traction ropes 4, and then the tension wire passes through the plurality of guide rolls 21. The other end of (20) can be fixedly connected to the rope end of another traction rope (4).

At this time, the tension wire 20 is set to a length such that its base is loosely sagging due to its own weight, and when pushed up by the electric cylinder 50, the base of the tension wire 20 is bent into a "∧" shape and tensioned.

In the hanger 2, link shafts 30 are installed on both lower sides of each guide roll 21, and two sets of links 31 are installed symmetrically on each link shaft 30. . The link 31 is a lever type with the axis as the support and the inner end as the force. A tension spring (32) is installed between the inner end of each link (31) and the bottom of the hanger (2).

Here, the guide roll 21 is installed at an upper portion of the inner end of the link 31 and at a predetermined position of the hanger 2, and guides the tension wire 20 to pass stably through the electric cylinder 50. ) is desirable to ensure smooth operation.

The tension spring 32 pulls the inner end of the link 31 and operates the detection switch 40 when the tension of the tension wire 20 is released, assuming that the traction rope 4 is relaxed or broken. The outer end of the link 31 is a pressure means for operating the fall prevention unit 5.

The detection switches 40 are made up of two sets, and are installed on the bottom of the left and right hangers of the electric cylinder 50 at a position within the turning radius of the inner end of each link 31.

In addition, the electric cylinder 50 pushes up the middle portion of the bottom of the tension wire 20 to tension the hanger 2, which meets an imaginary vertical line passing through the center of the bottom of the tension wire 20 at the bottom of the hanger 2. ), so that the tension on the tension wire (20) is balanced left and right, thereby increasing the precision of checking the tension of the traction rope (4).

As shown in FIGS. 2 and 3, the electric cylinder 50 is raised to tension the tension wire 20, tension is applied to the traction rope 4, and the machine waits. At this time, the inner end of the link 31 is lifted, the detection switch 40 is in the OFF state, and the fall prevention unit 5 is in a state as shown in (a) of FIG. 5, and the wheelchair lift operates normally.

Additionally, an operation switch (S1) is installed to be located at the top of the electric cylinder (50). When the rod of the electric cylinder 50 is stretched to the maximum so that the tension wire 20 is in a tensioned state, the upper end of the rod is turned on by pressing the operation switch S1, so that normal operation is performed at the control panel (not shown). When the condition is recognized as possible, the wheelchair lift can operate normally.

As shown in FIG. 4, it is assumed that the traction rope 4 is relaxed or broken, and the electric cylinder 50 is operated.

When the electric cylinder 50 is operated to lower the rod, the operating switch S1 is short-circuited and turned off, and the tension on the tension wire 20 is released, causing the bottom to sag, and the sagging is caused by the link ( It is transmitted to the tension spring (32) through the inner end of 31). The inner end of the link 31, which was rotating downward by the tension spring 32, is turned on by pressing the detection switch 40, thereby stopping the entire operation of the hydraulic cylinder 3 and the wheelchair lift, and at the same time, the outer side of the link 31 is turned on. The stage operates the fall prevention unit (5) to bring the hanger (2) to an emergency stop.

At this time, the fall prevention unit 5 is hinged with the outer end of the link 31, and includes a pair of wedges 51 installed symmetrically with the rail 9 between them, and the pair of wedges 51 It consists of a pair of wedge blocks (52) that are installed in a tapered manner to narrow the gap as it rises and enters.

That is, as soon as the detection switch 40 stops the operation of the hydraulic cylinder 3, the fall prevention unit 5 operates and the wedge 51 rises to the mast 1 as shown in (b) of FIG. 5. As it enters between the installed wedge blocks 52, the wedges 51 strongly bite the rail 9, thereby preventing the hanger 2 from falling.

In summary, the test device for the cage fall prevention part of the vertical wheelchair lift of the present invention is to install a hanger (2) as a substitute for a cage on the mast (1) to be able to raise and lower, and tow it on the top of the piston (6) of the hydraulic cylinder (3). Wind the rope (4) in a ∩ shape, fixing one end to the hanger (2) and the other end to the balance load (10) of the mast, using the end of the rope on the hanger (2) side as the vertex of an isosceles triangle, and A guide roll (21) is installed at a point corresponding to the bottom edge, and both ends of the tension wire (20) passing through these guide rolls (21) are respectively fixedly connected to the rope ends of the traction rope (4), and the tension The electric cylinder 50 is fixed at the center of the wire 20 and stretches the rod to tension or relax the tension wire, and is rotatably coupled to the link shaft 30 installed on both lower sides of the guide roll 21. It has a structure in which the link 31 and the fall prevention unit 5 operated by the link 31 are organically combined.

On the other hand, the test method assuming that the traction rope (4) is broken using the cage fall prevention test device of the vertical wheelchair lift according to the present invention, in which the plurality of components as described above are assembled and installed, is first performed by the operator or inspector. When the inspection switch (not shown) of the control panel (not shown) installed outside the self-mast (1) is turned on, the rod of the electric cylinder (50) is reduced, and the tension of the tension wire (20) is released, and the link The link 31 coupled to the shaft 30 is rotated downward by the tension spring 32, and the inner end of the link 31 is turned on by pressing the detection switch 40, stopping the entire wheelchair lift system.

At the same time, a pair of wedges (51) constituting the fall prevention portion (5) hinged to the outer end of the link (31) rotating upward by the tension spring (32) rises and moves between the tapered wedge blocks (52). As it enters, it is possible to easily check whether the wedge 51 can stop the hanger by strongly biting both sides of the rail 9.

In order to operate the wheelchair lift normally after the test of the fall prevention unit 5 is completed, first, when the inspection switch of the control panel is turned OFF from the outside, the rod of the electric cylinder 50 is extended and the tension wire 20 is It becomes tense again, and as a result, the inner end of the link 31 rises and the detection switch 40 is turned off, and the outer end of the link 31 falls to the wedge 51 of the fall prevention unit 5. The rail (9) is lowered and returned to its original state, thereby releasing the fall prevention.

Additionally, when the electric cylinder 50 rod is extended and the operation switch S1 is turned ON, the control panel recognizes that the tension wire 20 is in a fully tensioned state, allowing the wheelchair lift to operate normally.

As described above, the test device for the cage fall prevention unit of a vertical wheelchair lift according to the present invention does not require the operator or inspector to directly check the operation status of the fall prevention unit while riding in the cage or hanger, but simply turns on the inspection switch from the outside. By manipulating and checking the operating status of the fall prevention device, the inventor not only improves safety by ensuring the safety of workers or inspectors, but also greatly improves the efficiency and productivity of the fall prevention device test work, which has a very high industrial applicability. will be.

The present invention is not limited to the above description and drawings, and includes substitution, modification, and alteration of some components by those skilled in the art without departing from the technical spirit of the present invention.

1: Mast 2: Hanger 3: Hydraulic Cylinder
4: Towing rope 5: Fall prevention unit 7: Pulley
9: Rail 10: Balance load 11: Fixture
12: Spring rod 13: Load cell 14: Compression spring
20: tension wire 21: guide roll 30: link shaft
31: Link 32: Tension spring 40: Sensing switch
50: Electric cylinder S1: Operation switch

Claims (5)

A hanger hoistway is secured, a mast with rails installed on both inner walls, a hanger as a substitute for a cage, a hydraulic cylinder installed at the top of the piston with a pulley for draping a traction rope, and the pulley is wound in a ∩ shape, and at one end is the above. It is fixed to a hanger, and the other end is installed at the base of the mast and includes a two-strand traction rope fixed to a balance load that replaces the balance weight, and a fall prevention unit installed on both sides of the mast, making it a wheelchair lift module,
A link shaft installed below the rope end of the towing rope fixed to the hanger, a link installed on the link shaft, a tension spring connecting the inner end of the hanger and the link, and a virtual isosceles below the rope end of the towing rope. A plurality of guide rolls respectively installed at the bottom vertices of the triangle, a tension wire whose both ends via the plurality of guide rolls are fixed to the rope ends of the traction rope, and an electric cylinder for pulling up and tensioning the tension wire; , A cage fall prevention unit testing device for a vertical wheelchair lift, characterized in that the inner end of the link rotating around the link axis operates a detection switch, and the outer end operates the fall prevention unit.
According to paragraph 1,
The tension wire uses the rope end on the hanger side of the towing rope as the vertex of an isosceles triangle, passes through a plurality of guide rolls installed at the apex of the base of the isosceles triangle below the rope end of the towing rope, and then both ends are pulled. A cage fall prevention unit test device for a vertical wheelchair lift, which is each fixed to the rope end of the rope, and the tension of the tension wire can be adjusted by fixing the middle part of the tension wire to the top of the rod of the electric cylinder.
According to paragraph 1,
The link axis is a pair, and the links are installed symmetrically for each link axis, so that when the tension of the tension wire is released, the inner end of the link that rotates around the link axis, driven by the tension spring, descends and presses the detection switch to generate hydraulic pressure. A test device for the cage fall prevention part of a vertical wheelchair lift, characterized in that it allows stopping the operation of the cylinder.
According to paragraph 1,
When the tension of the tension wire is released, the outer end of the link, which is driven by the tension spring and rotates around the link axis, rises to operate the fall prevention unit to prevent the hanger from falling, and the fall prevention unit is connected to the link. It is hinged with the outer end of and is composed of a pair of wedges installed symmetrically with the rail in between, and a pair of wedge blocks that are tapered to narrow the gap when the pair of wedges rises and enters. Test device for cage fall protection of vertical wheelchair lift.
According to paragraph 1,
The balance load includes an anchor that anchors the other end of the traction rope that hangs over the upper pulley of the piston of the hydraulic cylinder, a spring rod formed at the bottom of the anchor, a pressure plate loosely fitted under the base of the mast, and a compression spring for pressing the pressure plate. A test device for the cage fall prevention part of a vertical wheelchair lift, characterized in that:

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