JPH08217353A - Reset testing device for hydraulic shock absorber - Google Patents

Abstract

PURPOSE: To enable a plunger to smoothly lower down to a final lower end position by providing an operating handle, which can be gripped by one hand, in an end part of a lever in a belt coiler device. CONSTITUTION: In the case of reset testing a plunger, when performed a repeatedly reciprocating motion in a vertical direction by gripping with one hand a lever 21 of a belt coiler device 13, a belt is intermittently lowered down to a final lower end position. After lowering down to the final lower end position of the plunger, the lever 21 is rotated to separate the second stopper 25 from a ratchet 20, also pull a tension fitting 28 by a finger of the one hand of gripping the lever 21, so as to separate the first stopper 22 from the ratchet 20. Then, a drum 19 and the ratchet 20 are placed in a turnable condition, to lift the plunger by spring tension, further to unwind the belt 14. The belt 14 is unwound to measure a time for the plunger to return to an upper end position of the original condition, so as to confirm whether this time is within a prescribed time or not.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a return test device for a hydraulic shock absorber that is erected in a pit at the bottom of a hoistway.

[0002]

2. Description of the Related Art As a return test device of this type, as shown in Japanese Patent Publication No. 2-58579, two hooks are provided on the outer circumference of a cylinder of a hydraulic shock absorber, and one of these hooks is used. There is known a structure in which one end is engaged, the middle part is hooked on the plunger upper part of the hydraulic shock absorber, and the other end is provided with a connecting body connected to the belt retractor.

[0003]

In the above-mentioned conventional return test device, the belt of the belt winding device is repeatedly reciprocated in the vertical direction to wind the belt into the drum of the belt winding device, and the plunger is moved to the final position. It is necessary to lower it to the lower end position. However, the lever is provided so as to be rotatable with respect to the drum and the ratchet, has a substantially U-shape, and is further provided with a stopper and a spring for preventing the belt from being rewound. It was difficult to grasp with the fingers of the worker to be tested. Therefore, when the lever is reciprocally moved in the vertical direction, the hand is hurt and the lever cannot be grasped sufficiently, so it takes time to repeat the reciprocating motion, and the descending work of the plunger cannot be performed smoothly. There was a problem.

An object of the present invention is to provide a return test device for a hydraulic shock absorber, which can easily reciprocate the lever in the vertical direction and smoothly lower the plunger to the final lower end position. .

[0005]

[Means for Solving the Problems] The above object is to provide a cylinder, which is erected on the inner bottom of the pit at the bottom of the hoistway and is filled with oil, and a plunger slidably fitted to the cylinder. And a spring body for urging the plunger upward, when the elevator car or the counterweight collides with the upper surface of the plunger, when the oil in the cylinder moves to the plunger side. A return test device for use in a hydraulic shock absorber in which the car or the counterweight is buffered and stopped by the obtained damper action and the spring force of the spring body, the return test device being at least a belt winding device. The device, one end of which is attached to a fixed portion other than the plunger, and the middle of which is hung on the upper surface of the plunger, and A belt, the end of which is attached to the belt retractor so that the belt can be retracted, and one end of which is attached to a fixed portion other than the plunger, and the other end of which is a coupling body which is coupled to the belt retractor. The belt winding device includes a drum around which the belt is wound, a ratchet that rotates integrally with the drum, a lever rotatably provided with respect to the ratchet and the drum, and the lever, A first stopper that is movably supported in a direction toward and away from the ratchet and that engages and disengages with the ratchet; and a first spring that urges the first stopper to engage with the ratchet. A bracket rotatably provided with respect to the ratchet and the drum, and a direction toward and away from the bracket for the bracket At least a second stopper that is movably supported by the ratchet and that engages and disengages with the ratchet; and a second spring that urges the second stopper to engage with the ratchet, and the lever. This is achieved by providing an operation handle that can be grasped with at least one hand at the end of the.

[0006]

According to this structure, when the plunger return test is performed, if the lever of the belt retractor is gripped with one hand and repeatedly reciprocated in the vertical direction, the belt is intermittently lowered, and eventually. Lower to the final lower end position (the position where the head of the plunger collides with the upper part of the cylinder).

When the plunger is lowered to the final lower end position, the lever is rotated to release the second stopper from the ratchet by the cam integrally provided on the lever, and the puller is pulled by the finger of one hand holding the lever. As a result, when the first stopper is separated from the ratchet, the drum and ratchet become rotatable, the plunger is raised by the spring force of the spring body, and the belt is unwound.

When the belt is unwound and the plunger reaches the upper end position in the original state, the time is measured with a stopwatch or the like, and it is confirmed whether the time is within a predetermined time, for example, 90 seconds. . If it is within 90 seconds, the hydraulic shock absorber is certified as a passing product.

When the lever is repeatedly reciprocally rotated in the vertical direction, the lever can be reciprocally rotated without difficulty if the lever is operated by holding the operation handle extended to the end of the lever. Even if the belt retractor is positioned below the outer circumference of the cylinder so that the belt retractor does not come into contact with the plunger, the plunger can be moved to the final position by operating the handle provided on the end of the lever. The work of lowering to the lower end position can be performed easily.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, in a hoistway 1 such as an elevator installed in a building or the like, an elevator car 2 is provided so as to be guided vertically by two guide rails 3 and 3a. The guide rails 3 and 3a are fixed to the inner wall of the hoistway 1 using a plurality of rail brackets 4. A rope 5 is attached to the upper surface of the car 2. A balance weight (not shown) is attached to the other end of the rope 5. By moving the rope 5 up and down, the car 2 moves up and down along the guide rails 3 and 3a. A hydraulic shock absorber 6 is erected on the inner bottom 1b of the pit 1a of the hoistway 1.

As shown in FIG. 2, the hydraulic shock absorber 6 has a cylindrical cylinder 7 filled with oil and a cylindrical plunger 8 slidably fitted in the cylinder 7.
And provided in the cylinder 7 and the plunger 8
Spring body 9 for urging in the direction of raising (returning direction) and the adjusting rod 1 which is erected from the bottom surface of the cylinder 7 and is fitted in the oil spray hole 8a of the plunger 8.
0. An air hole 8b is formed on the upper side surface of the plunger 8. A cushioning member 11 made of elastic rubber or the like is provided on the upper surface of the plunger 8 using an oil injection port (not shown) provided on the upper surface of the plunger 8.
It is fixed with fasteners such as flat head screws. A large diameter portion 8c is formed at the upper end of the plunger 8.

The return test device 12 for the hydraulic shock absorber 6 includes a belt retractor 13 and a shock absorbing member 11 having one end attached to a fixed portion other than the plunger 8 and an intermediate part provided on the upper surface of the plunger 8. And a nylon belt 14 which is attached to the belt retractor 13 such that the other end of the belt is retractable, and one end of which is attached to a fixed part other than the plunger 8 and the other end of which is the belt retractor. Device 1
3 and at least a nylon connector 15 connected to each other. In the present embodiment, the fixed portion other than the plunger 8 is the cylinder 7, and the hanging metal 16 is fixed to the outer peripheral wall of the cylinder 7. One end of the belt 14 and one end of the connecting body 15 are connected to the hanging metal 16 by a delta ring. It is detachably attached using the metal fitting 17. Belt 14 and connecting body 1
The fixed portion to which 5 is attached is not limited to the outer peripheral wall of the cylinder 7, but the hydraulic shock absorber 6 may be attached to the pit 1a.
Any portion other than the plunger 8, such as a pedestal portion for standing on the inner bottom 1b of the above, may be used. Further, in a state where one end of the belt 14 and one end of the coupling body 15 are attached to a fixed portion other than the plunger 8, as shown in FIG. 3, the position of the belt retractor 13 is positioned outside the cylinder 7, Moreover, the position of the belt length adjusting fitting 18 provided on the belt 14 is located outside the cylinder 7.

The belt retractor 13 includes a steel drum 19 around which the belt 14 is wound, and steel plate ratchets 20 and 20a provided on the left and right of the drum 19 and rotating integrally with the drum 19. , This ratchet 20, 20a
And a lever 21 made of a steel plate rotatably provided with respect to the drum 19, and a ratchet 20,
A first stopper 22 made of a steel plate that is movably supported in a direction toward and away from a and engages and disengages with the ratchets 20 and 20a, and the first stopper 22 is engaged with the ratchets 20 and 20a. The first spring 23 formed of a coil spring plate that is biased toward the ratchet 20, a bracket 24 made of a steel plate rotatably provided with respect to the ratchets 20 and 20a and the drum 19, and the bracket 24 approaching the ratchets 20 and 20a. Ratchets 20, 20 supported movably in and away from each other
a second stopper 25 made of a steel plate that engages and disengages with a, and a second spring 26 made of a coil spring material that urges the second stopper 25 to engage with the ratchets 20 and 20a. There is.

The lever 21 is welded with an operation handle 27 which can be gripped with at least one hand. The operation handle 27 is formed by bending round steel having a diameter of 6 mm into a substantially U-shaped state and then welding both ends 27 a and 27 b in the U-shaped state to the ends of the lever 21. Lever 2
After moving the second stopper 25 against the spring force of the second spring 26, the second stopper 25 is moved to the outer peripheral portion of the first stopper 25.
The cam 21 that locks with and prevents the bracket 24 from rotating
a and 21b are formed. A first moving groove 21c into which the first stopper 22 is movably fitted in the lever 21.
Are formed. The bracket 24 is formed with a second movement groove 24a into which the second stopper 25 is movably fitted.

A pulling tool 28 is attached to the first stopper 22. The pulling tool 28 has a wire 29 made of stainless steel and having a diameter of 1 mm, and an O-ring 30 made of stainless steel and having an outer diameter of 30 mm.
A stopper 22 is attached. To attach the pulling tool 28, attach both ends of the wire 29 inserted into the O-ring 30,
After inserting into the guide hole 21d provided in the lever 21, both ends thereof are fixed to the mounting holes 22a and 22b of the first stopper 22 by using the matching terminals to finish the process. The lever 21 has a horizontal width L1 of 40 mm and a vertical width L2 of 15 mm.
It is designed so that one side can be held in a stable state. A support piece 31 for supporting the second spring 26 is fixed to the bracket 24.

The first stopper 22 has a first moving groove 21c.
And a second member 33 which is welded to the first member 32 and to which the wire 29 is attached. A guide piece 32 a for guiding the first spring 23 is formed on the first member 32. Mounting holes 22a and 22b are formed in the second member 33.

A head guide member 34 as shown in FIG. 8, for example, is mounted on the cushioning member 11 of the plunger 8. In the head guide member 34, the belt 14 does not come off from the upper surface of the cushioning member 11 of the plunger 8,
The first flat plate 35 and the first flat plate 35 are provided on both sides of the first flat plate 35 and are engaged with the outer periphery of the upper end of the plunger 8. A head guide body A made of a steel plate composed of possible first hanging pieces 35a, 35b and rising pieces 35c, 35d provided on the side portion of the first flat plate 35 and for preventing the belt 14 from falling off. The second flat plate 36 and the plungers 8 provided on both sides of the second flat plate 36 and
Has a head guide support B made of a steel plate, which is composed of second hanging pieces 36a, 36b engageable with the outer periphery of the upper end of the head guide support B, and the head guide support B is located below the head guide A. The head guide support B and the head guide A are rotatable around the shaft 37.

When performing a return test of the hydraulic shock absorber 6 on the return test device 12 having the above-described structure, the following (1) to
The operation may be performed in the procedure of (10).

(1) The burnable dustproof cover made of noncombustible material attached to the hydraulic shock absorber 6 is removed in advance.

(2) The amount of oil in the cylinder 7 of the hydraulic shock absorber 6 is confirmed, and when the amount of oil is small, the oil is injected into the cylinder 7 so that the amount of oil reaches the specified value.

(3) A hook 16 is attached to the lower portion of the outer periphery of the cylinder 7, and a head guide member 34 is attached to the upper surface of the cushioning member 11 on the plunger 8.

(4) Attach the belt 14 to the head guide member 3
After hanging on 4, the delta ring fitting 17 of the belt 14 and the delta ring fitting 17 of the connecting body 15 are attached to the hanging fitting 16, and the length of the belt 14 is adjusted by the belt length adjusting fitting 18, As shown in 3, the return test device 12 is installed in the hydraulic shock absorber 6.

(5) Lever 21 of belt winding device 13
By opening and closing a plurality of times, the belt 14 is wound around the drum 19 of the belt winding device 13, and the plunger 8 is intermittently lowered.

(6) When the belt 14 is wound on the drum 19 and the plunger 8 is lowered to the end of the plunger stroke, the lever 21 is opened and the pulling tool 28 is pulled to pull the drum 19 and The engagement between the ratchets 20 and 20a and the lever 21 and the bracket 24 is released.

(7) Drum 19 and ratchet 20, 2
0a is disengaged from the lever 21 and the bracket 24, the belt 14 is unwound from the drum 19, and the time until the plunger 8 returns to the original state is measured. If the measurement time is within 90 seconds, the hydraulic shock absorber 6 passes the return test.

(8) Attach the belt 14 to the head guide member 3
4 is removed from the upper portion of the plunger 8, and the belt 14 and the delta ring fitting 17 of the connecting body 15 are removed from the hanging fitting 16.

(9) Loosen the threaded portion 16b of the hook 16 and move it to the bottom of the cylinder 7.

(10) A dustproof cover is attached to the hydraulic shock absorber 6.

In this way, by carrying out the operations (1) to (10), all the recovery test operations are completed. During the work of (5) above, the plunger 8 is intermittently lowered, so that the oil in the cylinder 7 does not spout around the hydraulic shock absorber 6 from the air hole 8b of the plunger 8. . Further, during the work of (6) above, the operation handle 2 of the lever 21 is attached to the O-ring 30 of the pulling tool 28.
Insert the finger of the hand holding 7 and pull the O-ring 30 with the finger, and ratchets 20 and 20a and the first stopper 2
While releasing the engagement of 2, rotate the lever 21,
The first stopper 22 is the locking cam 13a of the bracket 24.
It is possible to lock the drum 19 and the ratchets 20 and 20a with respect to the lever 21 and the bracket 24 with one hand without any difficulty, and it is easy to use.

Further, in this embodiment, the wire 29 of the pulling tool 28 is inserted into the guide hole 21d of the lever 21 so that the O-ring 30 is always brought close to the operation handle 27. It is easy for the fingertips of the hand holding the O-ring 30 to enter.

Further, in the present embodiment, the operation handle 27
Since the round steel is bent into a U-shape and both ends of the U-shape are welded to the ends of the lever 21, the operation handle 27 can be reliably gripped with one hand. Since it does not wobble from side to side, lever 21
It is possible to reciprocate vertically without difficulty, and the plunger 8 can be smoothly lowered.

[0033]

As described above, according to the present invention, since the vertical reciprocating motion of the lever can be easily and reliably performed with one hand, the plunger is smoothly lowered to the final lower end position. It is possible to obtain a reset test device for a hydraulic shock absorber.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a main part of a hoistway showing an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a main part of a hydraulic shock absorber showing an embodiment of the present invention.

FIG. 3 is a perspective view of a hydraulic shock absorber according to an embodiment of the present invention with a return test device attached thereto.

FIG. 4 is a perspective view of the belt retractor showing the embodiment of the present invention with the lever closed.

FIG. 5 is a perspective view of the belt retractor showing the embodiment of the present invention with the lever opened.

FIG. 6 is an enlarged view of the first stopper provided on the lever of the belt retractor showing the embodiment of the present invention.

FIG. 7 is a view on arrow P of FIG. 6 showing an embodiment of the present invention.

FIG. 8 is a perspective view of a head guide member showing an embodiment of the present invention.

FIG. 9 is an enlarged plan view of a hanging metal part of the return test device mounted on the hydraulic shock absorber according to the embodiment of the present invention.

FIG. 10 is an enlarged side view of a metal fitting of the return test device mounted on the hydraulic shock absorber according to the embodiment of the present invention.

[Explanation of symbols]

 1 Hoistway 1a Pit 6 Hydraulic shock absorber 7 Cylinder 8 Plunger 12 Return test device 13 Belt winding device 14 Belt 15 Connection body 16 Hanging metal fitting 17 Delta ring metal fitting 18 Belt length adjusting metal fitting 19 Drum 20, 20a Ratchet 21 Lever 22 1st stopper 22a, 22b Attachment hole 23 1st spring 24 Bracket 25 2nd stopper 26 2nd spring 27 Operation handle 28 Pulling tool 29 Wire 30 O-ring

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Rie Komori 1-6 Kandanishikicho, Chiyoda-ku, Tokyo Within Hitachi Building System Service Co., Ltd. (72) Inventor Shoji Yagawa 1-6-6 Kandanishikicho, Chiyoda-ku, Tokyo Shares Inside the Hitachi Building System Service

Claims (2)

[Claims] 1. A pit is installed upright at the bottom of the pit at the bottom of the hoistway,
Further, it is equipped with a cylinder filled with oil, a plunger slidably fitted in the cylinder, and a spring body for urging the plunger upward, and the elevator car on the upper surface of the plunger. Or, when the counterweight collides, the damper action and the spring force of the spring body obtained when the oil in the cylinder moves to the plunger side causes the car or the counterweight to stop buffering. A return test device used for a hydraulic shock absorber, the return test device comprising at least a belt retractor, one end of which is attached to a fixed portion other than the plunger, and the middle of which is on the upper surface of the plunger. A belt that is hung around, and the other end of which is attached to the belt retracting device so that the belt can be rolled up, and one end of which is the plan. A drum around which the belt is wound, the ratchet that rotates integrally with the drum, and the ratchet that is attached to the ratchet and the drum. A lever rotatably provided, a first stopper movably supported by the lever in a direction toward and away from the ratchet and engaged with and disengaged from the ratchet, and the first stopper is the ratchet. A first spring biased to engage with, and a bracket rotatably provided with respect to the ratchet and the drum,
The bracket includes at least a second spring movably supported in a direction toward and away from the ratchet and biased to engage with the ratchet, and at least at an end of the lever. A return test device for a hydraulic shock absorber, which is provided with an operation handle that can be held with one hand. 2. The lever is made of a steel plate, and the operation handle is formed by bending round steel into a U-shape and then welding both ends of the U-shape to ends of the lever. Hydraulic shock absorber recovery test device.