JPS58119552A - Cable puller device - Google Patents

Abstract

PURPOSE:To prevent an occurrence of an unexpected accident by providing in a cable puller device a slip detecting gripper for detecting slip of the gripper to the cable and a safety device for detecting the slip of cable to fix the cable. CONSTITUTION:When a wire rope 2 slips to a gripper 31 by any unexpected causes under the condition of detectable slip, a detecting gripper 40 descends together with the wire rope 2 against a force of a spring 43 by a spring 3 force from the back and a frictional force between the wire rope 2 and the detecting gripper 40. A movable lower end 44 bears against a right end of a trigger 60 so that the trigger 60 pivots about a pin 59 and the left end of the trigger 60 pushes up a movable collared piece 61. Further the trigger 60 pushes up an operating roller 63 in a hydraulic change-over valve 62 fixed to a parallel plate 64 to release a spring carrier 14 of a safety gripper 11. The gripper 11 instantly grips the wire rope 2 and simultaneously oil pressure in the hydraulic change- over valve 62 enters hydraulic cylinders 24, 34 to operate grippers 21, 31 for gripping the wire rope 2.

Description

[Detailed description of the invention] FIELD OF THE INVENTION The present invention relates to a cable puller device.

As shown in the longitudinal sectional view of FIG. 1, the known cable puller can pull up a heavy object by pulling a wire rope through the following four steps (AJ-(D)).

(5) When the lower gripper 81 is pushed into the housing 82 by the hydraulic cylinder 84 and grips the wire rope 2, the upper gripper 21 is pulled out from the housing 22 by the hydraulic cylinder 24 and grips the wire rope 2. Open.

However, when the lower moving platform 80 is pushed up by the hydraulic cylinder 38 and the wire rope 2 and the heavy load 1 rise accordingly, the upper moving platform 20 is lowered by the hydraulic cylinder 28 and becomes ready for pushing up. .

(Q) When the upper gripper 21 is pushed into the housing 22 by the hydraulic cylinder 24 and grips the wire rope 12, the lower gripper 81 is pulled out from the housing 82 by the hydraulic cylinder 84 to release the grip on the wire rope 2.

0 The upper moving table 20 is pushed up by the hydraulic cylinder 23, and the wire opening 2 and the heavy load 1 rise accordingly, and the lower moving table 80 is lowered by the hydraulic cylinder 33, and is ready for pushing up. Become.

By repeating the steps described below, the wire rope can be pulled to pull up a heavy object.

However, during the upward stroke, if slippage occurs between the gripper and the wire rope for some unforeseen reason, it is common to cause a serious accident.

The present invention was proposed in view of the above circumstances, and aims to provide a safe cable puller device that prevents major accidents even if the wire rope slips. In a cable puller device, which consists of two vertically installed pairs of grippers that are slidably inserted into a wedge-shaped guide groove and grip the cable from both sides, the cable is grasped and held in synchronization with each gripper, and the gripper is held relative to the cable. a slip detection gripper that detects target slip;
The purpose of this invention is to include a safety device that detects and secures the cable.

An embodiment of the present invention will be explained with reference to the drawings. FIG. 1 is a longitudinal sectional view thereof, FIG. 2 is a partial longitudinal sectional view showing a slip detection section of the lower grip device, and FIG. tu
Figure 4 is an enlarged vertical cross-sectional view of Figure 2, Figure 5 is a cross-sectional view along
The figure is a vertical cross-sectional view showing the lower parallel plate in Figure 4, Figure 6 is a cross-sectional view of Figure 5, and Figure 7 is different from Figures 5 and 6.
It is a partial side view which shows an Example.

In the above figure, the slip detection sections are attached symmetrically to the upper gripper device and the lower gripper device, respectively, as wire rope symmetry axes, so hereinafter mainly one side of the lower gripper device will be described. 81 is as mentioned above,
A pair of wedge-shaped grippers that removably hold the wire rope 2; 82 is a gripper housing that slidably guides the gripper 81; 35 is the gripper 31 and the housing 32;
The anti-friction material 82a is fixed to the opening of the housing, and the housing cover 40 has an arcuate contact surface recessed therein to prevent the gripper housing 32 from being elastically displaced outwardly. A pair of grippers for detecting slippage.
The force of the spring 55 causes the bell crank 54. Pressing roller 58. Cam 48, crimping guide plate 46. Guide bearing 47. Guide rod 41
．． Crimp the guide rod fitting 4.2 to the wire rope 2 with appropriate force. The upper and lower ends of the guide rod 41 are respectively fixed to guide rod mounting brackets 42 with pins 45, and guide bearings 4? are fixed to both upper and lower ends of a crimping guide plate 46? A guide rod 41 is mounted so as to be vertically movable therein, and is normally urged upward by a spring 4B. Reference numeral 50 denotes a detection unit containing a slip detection unit, which is vertically protruded from the lower end of each of the left and right pieces of the gripper 81, and moves integrally with the gripper 81. The crimping guide plate 46 is connected to the detection unit housing 50
The wire rope 2 is inserted into the wire rope 2, and circumferential movement around the wire rope 2 is restricted by a protrusion 51 of the housing, and longitudinal movement is restricted by a protrusion 52 of the housing 50 (see FIG. 4).

In such a device, in step tA) of the four steps of lifting work of the cable puller, the lower gripper 81
The state shown in FIG. 2 is the moment when the gripper 81 contacts the wire rope 2 during the movement in which the gripper 81 is pushed into the gripper housing 82 by the hydraulic cylinder 34.

At this time, there is a play between the pressing roller 58 and the crimping cam 48, and the crimping force of the slip detection gripper 40 against the wire rope 2 is zero, so there is a relative gap between the gripper 81 and the wire rope 2. Detection even if there is sliding movement
Buckwheat 40 remains pressed upward by the force of spring 48.

As the stroke of the hydraulic cylinder 84 progresses, the gripper 8
1 is pushed into the gripper housing 32, and the gripper 8
The wire rope 2 is strongly tightened by the wedge action on the back side of the wire rope 1, and the play between the roller 58 and the cam 48 is created to a length equal to the vertical tightening allowance when sufficient force is generated to lift a heavy object. As a result, when the wire rope 2 is secured by the gripper 81, the slip detection gripper 40 is also pressed against the wire rope 2 by the force of the spring 55, and the slip detection gripper 40 becomes in a state where slip can be detected.

In FIG. 4, in a state in which slippage can be detected, the detection section housing 50 descends to the lower protrusion 58 of the parallel plate 64 until its lower part contacts the trigger 60 and the slippage detection gripper 40.
The clearance with the lower moving end 44 is only 1 to 2 degrees.

In this state, if the wire rope 2 slips relative to the gripper 81 due to some unexpected cause, the detection gripper 40 will absorb the force of the spring 55 from the back and the force between the wire rope 2 and the detection gripper 40. Due to this frictional force, the detection gripper 40 descends with respect to the wire rope 2 against the force of the spring 43, and the lower moving end 44 moves toward the trigger 60. The trigger 60 is rotated around the circumference of the pin 159, and the left end of the trigger 60 pushes up the flanged moving piece 61, and further pushes up the parallel plate 6.
4, the operating roller 63 of the hydraulic switching valve 62 is pushed up to convert the slip signal into a hydraulic signal, and the spring receiver 14 of the safety gripper 11 shown in FIG. 1 is removed.

When the spring receiver 14 comes off, the force of the spring 18 causes the safety gripper to descend inside the housing 12 and instantly grip the wire rope 2, and at the same time, the hydraulic switching valve 62
A portion of the hydraulic pressure enters the hydraulic cylinders 24 and 84 and actuates the grippers 21 and 31 to close all grippers and grip the wire rope 2. The hydraulic system is equipped with a pressure accumulator so that this operation can be performed even during a power outage.

Further, the downward movement of the detection gripper 40 causes the detection gripper 4 to stop at a stopper 65 provided at the lower part of the detection unit housing 50.
0 comes into contact and stops, and if there is any slippage thereafter, the wire rope 2 slides within the detection gripper 40.

In addition, the trigger 60. Moving piece with flange 61. The mechanism consisting of the operating roller 68 and the hydraulic switching valve 62 is functionally the gripper 3.
It would seem that these devices should be fixed to the nozzle 50 since they only need to move following the movement of the gripper 31, but in that case, since the dimensions of each device are large, when the gripper 31 retreats upward, The above-mentioned devices cannot be attached to the grip housing 50 because of the problem of collision with the end face of the grip housing 82.

Therefore, in this embodiment, there is a half-movement plate 6 on the Nouji puffer fish 82 side.
This part is attached via 4. .

The structure and function of the parallel plate 64 will be explained below with reference to FIGS. 5 and 6. 74 is a fixed plate;
・It is fixed to the lower end of the housing 82 and includes a fixing bracket 75 and a spring fixing point 72, and the parallel plate 64, the bell crank 66, and the total weight attached to these, the force associated with pushing down the gripper 31, and the pushing down when detecting slippage. Support power, etc.

Reference numeral 64 denotes a parallel plate that performs approximate parallel movement in the vertical direction by the bell crank 66 and link 67, following the downward movement of grit 31 and the downward movement of slip detection gripper 40 when detecting slippage.

A hydraulic switching valve 62 is fixed on the parallel plate 64, and a lower protrusion 58 (
(See Figure 4). Also fixed is a bracket 76 with a movable hinge point 69 of the bell crank 66 for near parallel movement.

A bell crank 66 is rotatably pivoted around a fixed hinge point 68 at the corner of the L shape, and the fixed hinge point 68 is supported by a fixed bracket 75 fixed to a fixed plate 74, and is attached to the long side end of the bell crank. There is a moving pinch point 69 at the end supporting a bracket 76 fixed to the parallel plate 64, and a pinch point 70 on the short side of the bell crank is attached to a link 67 connecting the two bell cranks.

Reference numeral 71 denotes a tension spring, one end of which is connected to the spring receiver 72 fixed to the fixed plate 74, and the other end connected to the movable pinch point 6 of the bell crank 66.
9 are respectively locked to the spring receivers 73 near the parallel plate 6.
4 upward, and is mounted at an angle so that the pulling blade is almost even with the movement of the parallel plate 64.

FIG. 7 shows an embodiment in which a wire rope with a diameter of 1" is used to directly transmit the sliding motion of the slip detector as a mechanical motion, and as in the previous embodiment, the slipping signal is transmitted to the hydraulic pressure signal by the hydraulic switching valve. Compared to the case of converting to You can do each.

In the figure, 15 is a left and right gripper tuning lever, 16 is a tuning link, and l? is a trigger, 18 is a trigger spring, 19 is a manual trigger lever, and 79 is a hydraulic switching valve, which is activated by one turn of the trigger 17 and sends oil to a hydraulic cylinder 24.84 that pushes the gripper 21.81. The action of pushing the grips 21 and 31 is performed.

The spring receiver is fixed to the lever 14 and the tuning lever 15 to form a bell crank shape and is rotatable around a pinch point 80, which is fixed to the frame 8 (see FIG. 1).

At the upper end of the compression spring 18, the spring force is transmitted to the frame 8 by a fixed pinch point 82, and at the lower end, the spring force is supported by a pinch point 83 at the tip of the spring receiver lever 14, and the spring force is transmitted to the frame 8 by a fixed pinch point 82.
5. Via the tuning link 16 the left and right spring forces are balanced against the reaction force of the safety gripper trigger 17. A pinch point 87 approximately in the center of the trigger 17 is fixed to the frame 3, and the trigger 17 is rotatable around the pinch point 87. A trigger manual lever 19 is fixed to the trigger 17.
The trigger spring 18 is stretched between a spring receiver 85 fixed to the frame 3 and the trigger 17.

As shown in the figure, the trigger 17 is provided with a hydraulic switching valve 79 and an attachment point 88 for a small diameter wire rope 90 at appropriate positions. They are connected by short links 84. A small diameter wire rope 90 has an upper end fixed to a wire rope attachment point 88 of the trigger 17, a lower end fixed to an upper end 89 of a tension spring 91, and a lower end 92 of the tension spring 91 fixed to the frame 8.

There are sliding motion transmission elements at two places during the tensioning of the wire rope 90, of which the upper element is controlled by the gripper 21, and the lower element is controlled by the gripper 81, and both elements have exactly the same structure and function. Therefore, to explain one side, 98 is a pulley, and a small diameter wire rope 90
94 is a mold wheel, which is fixed to a pulley 98 and is rotatable about a shaft 98. The shaft 98 is fixed to the parallel plate 64. A bell-crank-shaped pawl 95 that engages with the mold wheel 94 is rotatable around a fixed pinch point 97 near the center, and the fixed pinch point 97 is fixed to the parallel plate 64, so that the pawl 95 is constantly separated from the mold wheel 94. Trigger 60 of the slip detection transmission element is biased by spring 96 in the direction of trigger 60 . The flanged moving piece 61 and the parallel plate 64 are the same as those in the previous embodiment, but a pawl 95 is used in place of the hydraulic switching valve 62.

In such a device, the above-mentioned four steps (
5), (B), (('), Q)), the parallel plate 64 moves following the hydraulic cylinder 23 or 33, and the pulley 98 moves in the vertical direction with the wire rope 90 wound around it. Driving idle.

Now, if one of these two sets of upper and lower slip detection units detects slippage and the slip detection gripper 40 starts a downward stroke, the trigger 60 is activated (1 , the flanged movable piece 61 moves upward, and the bellcrank mold 95 rotates against the spring 96 and engages with the mold wheel 94. When both engage, the pulley 93 is fixed to the parallel plate 64, and this When the second stage of the downward stroke of the detection gripper 40 continues from this state, the force of the spring 91 acts as pack tension on the wire rope wrapped once around the fixed pulley 98, and the wire rope above the pulley "J-pu" Spring 91
A force approximately twice the force of 17 operates the hydraulic switching valve 79 and sends oil to the hydraulic cylinder 1↓ cylinders 24 and 34 to switch the gripper 2.
1 and 31, all the grippers will operate and lock the wire rope. This operation and operation is performed automatically even in the event of a power outage.

In short, according to the present invention, in a cable puller device in which two sets of insertion collars are vertically arranged to be slidable in a wedge-shaped guide groove formed in a housing, a cable is gripped and held in synchronization with each gripper, and the gripper The present invention provides a safe cable puller device by including a slip detection gripper that detects relative slip to the cable, and a safety device that detects cable slip by using the slip detection gripper and fixes the cable. It is extremely useful for industry.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, FIG. 2 is a partial longitudinal sectional view showing a slip detection section of the lower grip device,
Figure 8 is a cross-sectional view of Figure 2 at -111VcG, Figure 4 is an enlarged vertical cross-sectional view of Figure 2, Figure 5 is a vertical cross-sectional view showing the lower parallel plate of Figure 4, The figure is a cross-sectional view of Figure 5,
The drawing is a partial side view showing another embodiment different from Figs. 5 and 6. l...1 scenery, 2...wire rope, 3...frame, 11...safety gripper, 12...safety gripper housing, 13...compression spring, 14...spring holder Lever, 15... Tuning lever, 16... Tuning link,
17...Trigger, 18...Trigger spring, 19...Trigger manual lever, 20...Upper moving table, 21...Upper gripper, 22...Gripper housing, 28.24
...Hydraulic cylinder, 80...Lower moving platform, 31...
・Lower gripper, 82...Gripper housing, 32
a... Housing cover, 38.84... Hydraulic cylinder, 35... Anti-friction material, 40... Detection gripper, 4
1... Guide rod, 42... Guide rod mounting bracket, 48...
・Spring, 44... Lower moving end, 45... Pin, 46
...Crimping guide plate, 47...Guide bearing, 48...
Cam, 50...Detector housing, 51.52...
Projection part, 53... Pressing roller, 54... Bell crank, 55... Spring, 58... Lower projection, 59... Pin, 60... Trigger, 61... Flange moving piece , 62...
・Hydraulic switching valve, 63... Operating roller, 64... Parallel plate, 65... Stopper, 66... Bell crank, 6
7...Link, 68...Fixed pinch point, 69...
Moving pinch point, 70... Pinch point, 71... Tension spring, 72... Spring fixing point, 73... Spring receiver, 74...
...Fixing plate, 75...Fixing placket, ? 6... Bracket, 79... Hydraulic switching valve, 80... Pinch point, 82... Pinch point, 88... Pinch point, 84...
・Short link, 84a...pinch point, 85...spring holder, 87...pinch point, 88...attachment point, 89...
Upper end, 90... Small diameter wire rope, 91... Tension spring, 9-2... Lower end, 98... Pulley, 94... Model wheel, 95... Claw, 96... Spring, 97...Fixed pinch point, 98...Axis sub-agent Patent attorney Tadashi Tsukamoto Fumi--de/, 5-De2

Claims (1)

[Claims] In a cable puller device comprising two vertically installed pairs of grippers that are slidably inserted into a wedge-shaped guide groove formed in a housing and grip the cable from both sides, the cable is gripped and held in synchronization with each gripper. A cable puller device comprising: a slip detection gripper that detects relative slip of the gripper with respect to the cable; and a safety device that detects slip of the cable using the slip detection gripper and fixes the cable.