JP3014295U - Towing gripping machine - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a compact gripping machine using a stronger spring. [Structure] In a towing gripping machine for gripping a steel rope 3 traveling with a fixed side grip 1 and a movable side grip 2, the fixed side grip 1 is integrated with a stationary cylinder 6 with a reaction force receiving flange 4 via a mounting body 5. On the other hand, the piston shaft 8 in the stationary cylinder 6 is configured as a double-ended output shaft type, and
Has one end connected to the movable side grip 2 and the other end connected to the male screw 9.
And a sliding cylinder 12 on the outside thereof, and a strong spring 13 between the sliding cylinder 12 and the reaction force receiving flange 4.
The lock nut 10 for restraining the movement of the sliding cylinder 12 is screwed onto the male screw 9 in the other end region of the piston shaft 8 to secure the gripping of the steel cord.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a carrier pulled by a steel rope, for example, a gripping machine used by being attached to an underframe of a steel rope railway, a cableway, other air sliders, water sliders and the like.

[0002]

[Prior art]

 Conventionally, in this type of towing gripping machine, for example, in an automatic circulation cableway, a steel rope is stretched and circulated between pulleys arranged at terminals at both ends, and the steel rope is installed in a carrier. The rope is gripped by the rope and the carrier is moved together with the movement of the steel rope. The carriage grasps the steel rope at the terminal at one end and departs, and then releases it when it reaches the terminal at the other end. It searches and stops.

As a conventional gripping machine used for such an automatic circulation cableway, its structure is disclosed in, for example, Japanese Utility Model Publication No. 1-9729, FIGS. 3A and 3B, and the gripping machine described here. In this structure, the gripping force is used to constantly grip the steel rope by using the compression force of the disc spring, and when the steel rope is released, the disc spring is further compressed by the spring rod to open the grip. However, if a large number of disc springs are stacked, the center line of the disc spring meanders during compression, causing contact galling between the inner diameter of the disc spring and the spring rod, which makes the compression reaction force unstable. As a result of the limitation of the number of stacked sheets, there is a drawback that the compression stroke cannot be long. Therefore, in such a conventional gripping machine, the stroke of the spring rod becomes short and the opening size of the grip at the time of discharging cannot be made large, which is not suitable for a thick steel rope. Moreover, there is a drawback that the gripping force also changes when the diameter of the steel rope changes.

In order to solve these problems, the present inventor first compressed the disc spring with the force generated by the combination of the movement of the piston shaft of the hydraulic cylinder and the cylinder to improve the reaction force. Although a gripping machine that exhibits the above-mentioned characteristics has been proposed (Japanese Patent Laid-Open No. 4-123967), although the conventional problems have been solved, the mounting spring, the piston shaft and the cylinder are arranged in series in this gripping machine. Because of this structure, the overall length is long, and this disadvantage becomes an obstacle as the spring becomes larger as a stronger gripping machine is manufactured. It has come to be seen that there is a drawback in that it is difficult to meet various demands for the trend toward lower floors.

[0005]

[Problems to be solved by the device]

 In consideration of the above-mentioned circumstances, the present inventor has earnestly studied about the structure of the gripping machine that secures stronger gripping force, higher reliability and safety while the gripping machine is a compact type with a short overall length. went. In the structure of a conventional gripping machine, the piston shaft connected to the grip, the hydraulic cylinder that incorporates the piston shaft, which can slide back and forth, the front and rear bearings that support this, and, in addition, the spring are coaxially connected in series. Since it was placed, it was long and hindered compactness.

Therefore, in order to improve this drawback, a hydraulic cylinder which was conventionally one is divided into a static cylinder and a sliding cylinder, which are concentrically arranged inside and outside, and an internal stationary cylinder opens and closes a grip and an outside cylinder. Since the sliding cylinder is in charge of compressing the spring, the overall length of the device is shortened, and by arranging the spring on the outside, a large and powerful spring can be incorporated to increase the gripping force. We came to discover that it was possible.

[0007] Thus, the present invention was made based on the above findings, and it is an object of the present invention to more reliably exert the gripping force of a steel rope and to provide a compact gripping machine using a stronger spring. To do.

[0008]

[Means for Solving the Problems]

 In order to achieve the above object, the characteristic feature of the towing gripping machine of the present invention is that the stationary side grip is attached to the stationary cylinder with the reaction force receiving flange that is fixed to the frame to be pulled. In a towing gripping machine that grips a driving steel rope with the fixed side grip and the movable side grip, a reaction force receiving flange is provided integrally with the stationary cylinder, and a piston shaft incorporated in the stationary cylinder is provided. It is configured as a double-ended output shaft type, one end of the piston output shaft is connected to the movable side grip, and a screw is engraved on the other end side of the piston shaft. An outer peripheral piston is provided so as to project to the outer surface, a sliding cylinder that slides by fluid pressure is combined with the outer peripheral piston outside, and a spring is installed between the sliding cylinder and the reaction force receiving flange. And, and, in that allowed screwing the lock nut to restrain movement of the sliding cylinder to the piston axis and the other end region of the screw.

[0009]

[Action]

 In the towing gripping machine of the present invention, the fixed side grip provided on the fixed side grip mounting body and the one end of the piston shaft that slides in the cylinder of the stationary cylinder where the piston shaft is a double-ended output shaft type The stationary cylinder is combined with a directly connected movable side grip, while the stationary cylinder is made stationary by the outer peripheral piston projecting to the outer surface of the center of the cylinder and the sliding cylinder which slides outside the outer peripheral piston by fluid pressure. After sliding on the cylinder cylinder and compressing the externally fitted spring, and after completion of the gripping action by fluid pressure, the action force around these two types of cylinders is related by the lock nut screwed to the rear end of the piston shaft. It is to restrain the grip and hold the gripping force and to completely prevent the accidental release operation.

First, when fluid pressure is supplied to the grip side of the stationary cylinder, that is, the lower gripping pressure chamber 6c in FIGS. 1 and 2, the piston shaft 8 slides and the movable side grip 2 is fixed. The steel rope 3 is gripped by contacting the grip 1. When more fluid is supplied, the pressure in the cylinder rises, and this pressure then passes through the hydraulic passage 16 that connects the stationary cylinder 6 and the sliding cylinder 12 to the pressurizing chamber 12c of the sliding cylinder 12 during gripping. The sliding cylinder 12 is guided and slides toward the grip side, downward in the figure, and at the same time, compresses it against the bias of the spring 13 between the sliding cylinder grip side end surface 12a and the reaction force receiving flange 4. However, the reaction force causes an increase in pressure in the pressurizing chamber 6c during gripping of the stationary cylinder 6, and appears as a gripping force between the movable side grip 2 and the fixed side grip 1. Since a pilot control check valve 14a is provided in the pressurizing side hydraulic pipe, the pressure of each cylinder is maintained even if the supply of fluid pressure is stopped under this condition, and the gripping force is the reaction force of the compression of the spring 13. Held by. Under this condition, by rotating the lock knuck 10 at the other end of the piston shaft 8 to fix the movement of the piston shaft 8, even if a leak or failure occurs in the pressure system after that, the gripping force is the same as above. It is mechanically held in the state.

Here, by making the pressure receiving areas of the pressurizing chambers 6c and 12c of the pistons of the stationary cylinder 6 and the sliding cylinder 12 equal to each other, "the compression force of the spring = the grip of the grip". It is worth noting that the relationship called "power" is established. However, depending on the scale of the gripping machine, it is easier to design and manufacture the spring if the pressure receiving area of each piston is changed and the fluid pressure acting on them is inversely proportional to the pressure receiving area to maintain balance. I can foresee. Even in that case, the purpose of the present invention can be easily achieved by using a known device on the market without significantly changing the purpose of the present invention.

On the other hand, when shifting to the released state, the lock nut 10 is turned in the opposite direction to be loosened by the stroke of the piston shaft 8, and then the stationary cylinder 6 and the sliding cylinder 12 in the released pressurizing chamber 6d, When pressure is supplied to 12d, the piston shaft 8 extends and the grip is released, the sliding cylinder 12 returns to its original position, and the compressed state of the spring 13 is released. After that, this operation is repeated.

[0013]

【Example】

 Hereinafter, with reference to the accompanying drawings, a towing gripping machine according to the present invention will be described in detail based on embodiments.

1 and 2 are vertical cross-sectional views showing an embodiment of a towing grabber machine according to the present invention. FIG. It is shown.

In the figure, 1 is a fixed side grip for gripping a steel rope, 2 is a movable side grip thereof, and 3 is a steel rope released from both grips. As shown in the figure, the fixed-side grip 1 has a structure integrally continuous with the fixed-side grip mounting body 5 attached to the reaction force receiving flange 4 at the lower end of the stationary cylinder 6, while the movable-side grip 2 is hydraulically operated. It is fixed to the lower end of a piston shaft 8 attached to a piston 7 that slides in a stationary cylinder 6. The upper end of the sliding piston shaft 8 penetrates the stationary cylinder 6 and projects above it, and a male screw 9 capable of self-locking is engraved on that portion, and a lock nut 10 is screwed into it. .

On the other hand, the cylinder 6a of the stationary cylinder and the flange-shaped outer peripheral piston 6b provided on the outer surface of the substantially central portion of the cylinder 6a are combined with each other to form a sliding cylinder 12 which can slide up and down by fluid pressure. A spring 13 is mounted between the sliding cylinder grip side end surface 12a at the lower end and the reaction force receiving flange 4 as shown in the drawing. As this spring, in order to shorten the total length of the gripping machine and obtain a strong gripping force, a small disc spring having a large repulsive force and a stable function is suitable. However, it goes without saying that a coil spring may be used in some cases. Hydraulic pipes 14 and 15 are connected to the gripping pressure chamber 6c and the discharging pressure chamber 6d at both ends of the stationary cylinder 6 which is hydraulically operated. The system of the hydraulic piping 14 is equipped with a pilot control check valve 14a, an accumulator 14b and a pressure switch 14c, and a set of limit is provided between the sliding cylinder grip side end face 12a and the reaction force receiving flange 4. Switch 19 is attached. Note that the gripping pressure chamber 6c of the stationary cylinder 6 and the gripping pressure chamber 12c of the sliding cylinder 12 slide with the hydraulic passage 16 and with the discharge pressure chamber 6d of the stationary cylinder 6. A hydraulic passage 17 communicates with the pressurizing chamber 12d when the cylinder 12 is discharged so that mutual pressures are conducted. In addition, a seal packing 18 is fitted in each seal portion of the hydraulic cylinder.

On the other hand, the rotation of the gear motor 21 with an electromagnetic brake attached to the mounting body 24 connected to the reaction force receiving flange 4 is transmitted from the gear 22 of the output shaft to the gear 11 on the outer periphery of the lock nut 10 via the pinion 20. The structure is such that the lock nut 10 can be rotated to move up and down along the male screw 9. As shown, the pinion 20 is rotatably supported by a mounting body 24 and a bearing 23.

Next, with reference to FIG. 2, the function of the steel rope 3 being sandwiched by the openings of the fixed-side grip 1 and the movable-side grip 2 to reach the gripping rope will be described.

First, when hydraulic oil is supplied to the hydraulic pipe 14, the piston 7 of the stationary cylinder 6 moves upward in the figure, the fixed side grip 1 and the movable side grip 2 are closed, and the steel rope 3 is gripped. When the oil supply is further continued, the hydraulic oil is transmitted through a hydraulic passage 16 which connects the stationary cylinder 6 at the time of gripping the pressurizing chamber 6c and the sliding cylinder 12 at the time of gripping the pressurizing chamber 12c. The spring 12 is moved downward against the bias of the spring 13 and the spring 13 is compressed, so that the hydraulic pressure rises. The pressure increase generated at this time acts on the piston 7 and is transmitted to the movable grip 2 and exerts a strong gripping force on the steel rope 3.

Thus, when the desired gripping force is generated, the pressure switch 14c is turned on, while the limit switch 19 is turned on when the spring 13 is compressed to a specified stroke against the bias. Then, it is confirmed that the gripping of the steel rope 3 is normally performed by the establishment of the AND circuit of these two switches. Further, on one side, the pilot control check valve 14a and the accumulator 14b in the path of the hydraulic pipe 14 act to prevent the supplied hydraulic oil from leaking and maintain the positions of the piston 7 and the sliding cylinder 12 so that the grip is prevented. There is no loss of power.

Next, after a series of gripping work by the operation of the hydraulic cylinder and the spring 13 is completed, the gear motor 21 with an electromagnetic brake, the gear 22, and the pinion 20 are driven to rotate and lower the lock nut 10, By abutting the lower surface and the upper end surface of the sliding cylinder extension sleeve 12b, which is an extension member of the sliding cylinder 12, the movement of the piston shaft 8 is completely restrained, and in the unlikely event that a failure occurs in the hydraulic system. It is also possible to form a mechanical gripping force retention mechanism to prevent accidental release. Here, the pulling strength of the male screw 9 does not generate the gripping force by tightening it, but it is sufficient as it is a safety device and can withstand the compression reaction force of the spring 13.

Next, as shown in FIG. 1, when releasing the cable, first, the geared motor 21 is reversely rotated to loosen the lock nut 10 so as not to limit the movement of the piston shaft 8, and then an electromagnetic valve (not shown). ) Is switched to supply oil from the hydraulic pipe 15, and the piston 7 and the piston shaft 8 are pushed downward to release the grip and release the wire. At this time, the sliding cylinder 12 can be returned to the original state only by the repulsive force of the spring 13, but for the sake of reliability and safety, the pressure is applied to the pressurizing chamber 12d of the sliding cylinder 12 through the hydraulic passage 17 as well. It is better to do it. The geared motor 21 with electromagnetic brake has a slipping clutch and a one-way clutch (neither shown) inside, and when tightening the lock nut 10 with gear 11, tightening torque is limited by the slipping clutch. To alleviate the shock, and to loosen the nut, a one-way clutch that is directly connected to the motor shaft only in the direction of rotation is incorporated to generate a strong torque. It should be noted that any other method can be adopted for this mechanism, and there is no particular limitation.

Further, the diameter of the steel rope changes between new and old, and at the seam portion of the steel rope, with reference to the nominal diameter, changes are approximately + 3% for a new product, -2% for a worn old product, and + 10% for a seam portion. However, in the gripping machine of the present invention, by keeping the pressure of the hydraulic cylinder and the compressive force of the spring constant, the gripping force can be constantly maintained.

In order to mount the index gripping machine on the towed frame of the carrier, for example, from the fixed side grip mounting body 5 integrally mounted with the reaction force receiving flange to the mounting body 24 on the upper side thereof. It is preferable to use it over time.

Although the embodiment of the present invention has been described above, the embodiment is shown as an example and the present invention is not limited to this, and the embodiment may be appropriately modified without departing from the purpose. Needless to say. For example, as described in Japanese Patent Application Laid-Open No. 4-12 3967 filed earlier by the present inventor, an L-shaped lever and a link are inserted between the movable side grip 2 and the piston shaft 8 to move the piston shaft 8. Adopting a structure in which the direction is converted to a right angle to open and close the grip, and further, a plurality of grips are arranged side by side to form a so-called multiple grip structure, or the grip has a scissor-like opening and closing structure. Various applications are possible and, of course, they do not depart from the spirit of the invention. Needless to say, the fixed-side grip mounting body 5 and the mounting body 24 can be variously changed depending on the shape of the carrier, the tow frame, and the peripheral conditions.

[0026]

[Effect of device]

 As described above, the present invention provides a stationary cylinder and a sliding cylinder that drive the fixed side grip and the movable side grip by the fluid pressure of the piston, a spring for generating and holding the gripping force by them, and the gripping state. It is based on a gripping machine composed of a mechanically-maintaining lock nut, and has the following effects. (1) Since the two cylinders, the stationary cylinder that drives the movable side grip and the sliding cylinder that compresses the spring, are arranged concentrically inside and outside, the total length is significantly shortened compared to the gripping machine of Japanese Patent Application Laid-Open No. 4-123967. Since it can be made compact and compact, it has been opened up for applications in low-floor vehicles that are friendly to people, who are increasingly demanded in recent years, and vehicles for underground railway vehicles that require a low overall height. (2) Since a spring with a large inner and outer diameter and a strong compression force can be used, it is possible to manufacture a gripping machine with a large gripping line pulling force suitable for a carrier of a large vehicle or the like. (3) The reaction force generated by compressing the spring not only grips with the hydraulic cylinder but also pressurizes it, and it remains as gripping force. Therefore, as long as the hydraulic circuit is closed and the hydraulic pressure is maintained, it remains stable and stable. It is possible to maintain a reliable gripping force. (4) In addition, after the completion of gripping, the movement of the piston shaft will be completely stopped by the self-locking screw and lock nut on the rear end side of the piston shaft, and the compressive force of the spring will be contained in the mechanism. Therefore, even if a failure occurs in the hydraulic system or the like during traveling and the hydraulic pressure drops, it is possible to ensure safety without being released. (5) In addition, since the system can be configured so that power is supplied to the hydraulic system and lock nuts only in the limited section before and after the station, there is no wire release due to a malfunction during running. (6) Even if the diameter of the steel rope changes from new to old, or at the seam, the gripping force can always be controlled because the pressure of the hydraulic cylinder and the compression force of the spring can be kept constant. A constant, stable and reliable traction force is obtained, which also helps protect the steel rope. This is an effect that could not be realized with conventional gripping machines that enter the locked state by crossing the dead point of the link mechanism. (7) In the conventional gripping machine of the type described above, when gripping and releasing, an excessive gripping force is generated at the moment when the link etc. passes the dead center, and correspondingly, the mechanical part must be made so sturdy. This was not the case with the lanyard, but as a result, it contributes to prolonging the life of the machine and reducing its weight. Also, as with the previous section, it is not a matter of course that it will also help protect the steel rope. (8) Furthermore, in the above-mentioned dead-end-lock type conventional gripping machine, noise was generated at the moment the link reached the lock position beyond the dead center, and it was difficult to prevent its impact and noise reduction. However, depending on the intended use, it is possible to perform a more gentle grabbing action. (9) The opening size of the grip when gripping and releasing is freely determined by the piston stroke of the hydraulic cylinder, so the desired wide opening size can be obtained according to the change in the steel line diameter. Also, when this is applied to multiple grips, etc., it is easy and reliable to insert the steel rope into the grip when changing grips, and it is possible to immediately cope with the lateral meandering amount of the moving machine while traveling, at the same time. It is possible to grasp the circumference of a steel rope with a wide enveloping angle without damaging it. (10) As in the previous section, the compression stroke of the disc springs can be short even if the opening size of the grip is widened, so the number of stacked disc springs can be small and uniform disc spring performance can be obtained. It is small and there is no structural difficulty. (11) Since the gripping force of the grip can be easily and reliably checked by the hydraulic pressure during gripping, daily performance diagnosis can be made extremely easy. (12) Even if the manufacturing accuracy of the spring varies, it is easy to adjust the compression stroke of the spring by adjusting the hydraulic pressure to readjust the gripping force. If this work is further extended, it becomes possible to change and adjust the gripping force within the range of the appropriate compression load of the spring, which are features and effects not found in the conventional type gripping machine. (13) Furthermore, having a wide opening size is suitable for a thick and strong steel rope grip, which facilitates the design and manufacture of a gripping machine for a large transporter such as a large vehicle with a large traction force. The effect that contributes to the realization of (14) The pontoon can be installed in any type of structure such as horizontal type, vertical type, vertical L-shaped type, with upper sheave, suitable for steep cable car routes, etc. It also has the effect of being easily applicable to a wide variety of types of carriers.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a released state of a gripping machine according to the present invention.

FIG. 2 is a vertical cross-sectional view showing the same lanyard.

[Explanation of symbols]

 1 Fixed-side grip 2 Movable-side grip 3 Steel rope 4 Reaction force receiving flange 5 Fixed-side grip mounting body 6 Stationary cylinder 6a Stationary cylinder tube 6b Outer piston 6c Gripping pressurization chamber 6d Expulsion pressurization chamber 7 Piston 8 Piston Shaft 9 Male screw 10 Lock nut 11 Gear 12 Sliding cylinder 12a Sliding cylinder grip side end surface 12b Sliding cylinder extension sleeve 12c Gripping pressurization chamber 12d Expulsion pressurization chamber 13 Spring 14 Hydraulic piping 14a Pilot control check valve 14b Accumulator 14c Pressure switch 15 Hydraulic piping 16 Hydraulic passage 17 Hydraulic passage 18 Seal packing 19 Limit switch 20 Pinion 21 Geared motor with electromagnetic brake 22 Gear 23 Bearing 24 Mounting body

Claims (1)

[Scope of utility model registration request] 1. A stationary cylinder having a reaction force receiving flange fixed to a towed frame is provided with a stationary grip via a stationary grip mounting body, and a steel rope which is driven and driven is provided by the stationary grip and the movable grip. In a towing gripping machine for gripping, a reaction force receiving flange is provided integrally with the stationary cylinder, a piston shaft incorporated in the stationary cylinder is configured as an output shaft type on both ends, and one end of the piston output shaft is a movable side grip. And a screw is engraved on the other end of the piston shaft, and an outer peripheral piston is provided so as to protrude from the outer surface of substantially the central portion of the cylinder of the stationary cylinder. A combination of a moving sliding cylinder, a spring mounted between the sliding cylinder and the reaction force receiving flange, and a lock nut for restraining the movement of the sliding cylinder. A towing gripping machine characterized by being screwed into a screw in the other end region of the piston shaft.