JPH0259097B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a wire drawing device, and more particularly, to a wire drawing device that unwinds and stretches a wire material to be drawn, such as a cable, from a drum every predetermined length.

[Background of the invention]

Conventionally, this type of wire drawing apparatus is composed of a rotating body such as a pair of rollers or a caterpillar, and a drive device that rotates the rotating body at a predetermined speed. The pair of rotating bodies are slightly spaced apart from each other, and the cable is fed out in the wire extension direction by the rotating bodies while being held under pressure at the spaced apart portion.

However, since the wire drawing equipment configured in this way holds the cable under pressure between a pair of rotating bodies, it is not possible to stretch multiple small diameter cables at the same time, and usually large diameter cables are stretched individually. It is used only when there is a line. Furthermore, since the clamping force of the rotating body for sending out the cable is constant, when a large load is applied to the rotating body, the rotating body may spin idling and damage the cable sheath (outer covering). Furthermore, when extending a long distance cable, it is necessary to install a plurality of cable extension devices, making it difficult to synchronize the cable extension devices.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a wire stretching device that is capable of simultaneously stretching a plurality of cables without damaging the cable surface.

[Summary of the invention]

In order to achieve the above object, the present invention provides a wire drawing device disposed on a wire drawing route along which a wire material to be drawn is drawn. a gripping device for a wire material to be drawn, which is arranged in a casing so as to be able to reciprocate along the drawing direction of the wire material to be drawn; and a moving device for returning the gripping device to its original position in a state in which gripping of the wire material to be drawn is released.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the wire drawing apparatus according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a sectional view of a wire drawing device according to an embodiment of the present invention, and FIGS. 2 and 3 are sectional views of a gripping device provided in the wire drawing device. The wire drawing apparatus of this embodiment is composed of rectangular casings 10, and the casings 10 are provided at predetermined intervals on the wire drawing route. The casing 10 is open at the top and has sockets 10A, 10A formed on both sides in the longitudinal direction. Four guide rollers 12, 12, 1 are provided in each socket 10A of the casing 10.
2 and 12 (only three are shown) are respectively sockets 10A,
They are arranged in a quadrilateral shape along the inner wall of 10A. And guide rollers 12, 12, 12, 1
A plurality of cables 14 are inserted into the space surrounded by 2. The guide rollers 12 guide the cable 14 during the wire extension and smooth the movement thereof.

At the bottom of the trolley 20 are wheels 22, 22, 22, 2.
2 is attached, and by the operation of a drive cylinder which will be described later, the truck 20 reciprocates in the longitudinal direction within the casing 10 as shown in FIG. The gripping device 16 shown in FIGS. 2 and 3 is mounted on a truck 20. The gripping device 16 shown in FIGS. On the bottom plate of the trolley 20 is an L angle 2.
4 and 24, a pivot shaft 26 is pivotally supported in the longitudinal direction of the truck 20. The pivot shaft 26 has
Two gripping tools (claws) 28, 28 at a certain interval
is installed. Two cylindrical hinges 27, 27 are rotatably fitted onto the pivot shaft 26 at positions shifted from the mounting positions of the grippers 28, 28. Grips 30, 30 similar to the grip 28 are attached to the hinges 27, 27, respectively. Gripping tool 28, 3
0 are curved toward mutually opposing sides,
The surface is covered with an elastic material 32 such as rubber. As shown in FIG. 2, the elastic material 32
8, 30 and the cable 14, and is advantageous in gripping the cable 14 reliably.

The gripping tools 28, 28 and the gripping tools 30, 30
As shown in FIG.
4, and the connecting members 34, 34 have gripping tools 2.
8, 28, 30, 30 rotation cylinder 36A,
36B is installed. Rotating cylinder 3
6A and 36B are connecting members 34 and 34 that are fixed to the side surface of the truck 20 and whose rods 37 and 37 face each other.
The upper part between the grippers 28 and 30 is opened and closed. That is, the rotation cylinders 36A, 36B retract the respective rods 37, 37 to close the grippers 28, 30, and the grippers 28, 30 grip the plurality of cables 14.... The rotation cylinders 36A, 36B extend the rods 37, 37 to open the gripping tools 28, 30.

A plurality of rollers 38, 38, . The rollers 38, 38... support the cable 14 from below when the grips 28, 30 are closed. A limit switch, which will be described later, is attached below the rollers 38, 38, and the limit switch is activated when the cable 14 is pressed onto the rollers 38, 38.
It turns ON and outputs a control signal to the control device described later.

As shown in FIG. 1, a long hole 39 is formed in the bottom of the casing 10, and a driving cylinder 40 is attached to the long hole 39. Drive cylinder 4
0, the rod 42 is connected to the tip of the cart 20, and the rod 42 is actuated to reciprocate the gripping device 16 between the starting point C and the ending point D. When the cart 20 is located at point C, the cable is pinched and held by the gripping tools 28 and 30 of the gripping device 16, and the cart 20 is moved to point D by the driving cylinder 40 while holding the cable. Ru. Thereafter, the cable is released from the grippers 28, 30, and the trolley 20 returns to point C with the rollers 38... in rolling contact with the cable.

FIG. 4 is an explanatory diagram showing a hydraulic system for the drive cylinder 40 of the truck 20 and the rotation cylinders 36A, 36B of the gripping device. A hydraulic fluid 49 as an operating fluid is stored in a receiver tank 66 of the hydraulic system, and is supplied to each cylinder via a solenoid valve 68. The driving cylinder 40 of the truck 20 is connected to conduits 70, 7 connected to the base pipe 69 of the receiver tank 66.
2. Control solenoid valve 74 for controlling the lock-up valve;
They are connected via a solenoid valve 76, a lock-up valve 78, and oil amount control valves 80, 80. The cylinder chamber of the driving cylinder 40 is divided into a right cylinder chamber 40A and a left cylinder chamber 40B by a piston 42A.
The oil is sent from the lock-up valve 78 to the right cylinder chamber 40A and the left cylinder chamber 40B. Cylinder chamber 40A, 40
The oil liquid 49 is supplied or discharged to B based on the control signal from the control device 44 described above. In order to detect the moving position of the truck 20, limit switches 46 and 48 are provided at both ends inside the casing 10. The limit switches 46, 46 are the control device 4
Connected to 4. Moreover, each cylinder chamber 40A,
A load measuring device 50 is connected to 40B. still,
A discharge pipe 81 as a speed controller is connected to the solenoid valve 76.

Rotating cylinders 36A, 36B of gripping device 16
is connected to the receiver tank 66 via a base pipe 69 and conduits 90 and 92. The conduits 90 and 92 are connected to a control solenoid valve 94 and a solenoid valve 96 that control a lock-up valve 98, and merge at the lock-up valve 98. A conduit 100 and a conduit 102 are connected to the lock-up valve 98, and the conduit 100 is connected to the right rotation cylinder 36A through a flexible hose 101.
connected to. The conduit 102 is connected to the left rotation cylinder 36B via a flexible hose 103. The conduit 102 is connected to the right cylinder chamber 106 partitioned by a piston in the cylinder 36B, and when the oil fluid 49 is supplied, the gripping tool 2
8 is moved in the opening direction (direction of arrow A shown in FIG. 4). Also, due to this supply, the left cylinder chamber 108 of the cylinder 36B is contracted, and the oil liquid 49 in the right cylinder chamber 106 is supplied to the left cylinder chamber 112 of the cylinder 36A through the conduit 110.
By supplying this oil 49, the gripping tool 30 is rotated in the opening direction. The oil 49 in the right cylinder chamber 114 of the cylinder chamber 36A is sent to the solenoid valve 96 via the conduit 100. Conversely, when the oil is sent from the conduit 100 to the right cylinder chamber 114 of the cylinder 36A, the grippers 28 and 30 are rotated to the closed state, and the plurality of cables 14 are pressed against the rollers 38 and held under pressure. In addition, strain gauges 120, 120 are provided on each of the gripping tools 28, 30, respectively, in order to detect the gripping state of the cables 14... of the gripping tools 28, 30 by the rotating cylinders 36A, 36B.
At the bottom of the is a limit switch 1 for checking load reception.
22 are provided. The strain gauges 120, 120 are
It is connected to the control device 44. In addition, the solenoid valve 96
has an outlet 116 as a speed controller.
is formed.

The strain gauges 120, 120 generate and transmit electrical signals to the controller 44 as the pressure of the grippers 28, 30 gripping the cable 14 increases. Within the control device 44, the electrical signals output from the strain gauges 120, 120 are detected, the electrical signals are amplified, and then calibrated by a calibrator to obtain a stress signal. When the stress signal reaches a certain value, the control device 44 outputs an electric signal to the control solenoid valve 94 indicating completion of gripping. The control solenoid valve 94 receives the control electric signal, excites the coil 94A, and activates the lock-up valve 98.
is operated to shut off the rotation cylinders 36A, 36B and the solenoid valve 96. With this, the gripper 2
8, 30 are cables 14, 14... with a predetermined pressure.
Press and hold to stop.

Upon gripping the cable 14 and receiving an electric signal from the control device 44, the driving electromagnetic valve 76 excites the coil 76A and introduces the oil 49 into the cylinder chamber 40A of the driving cylinder 40. As a result, the rod 42 of the drive cylinder 40 is pushed out, and the first
As shown in the figure, the gripping device 16 is moved from the starting position C to the ending position D to extend the cable 14.
When the gripping device 16 reaches the end position D, a control signal from the limit switch 46 is input to the solenoid valve 96 and the driving solenoid valve 76 via the driving device 44. The solenoid valve 96 receiving the control signal releases the oil 4
9 is supplied to the right cylinder chamber 106, and the gripping tool 28,
30 in the opening direction (direction of arrow A shown in FIG. 4). Moreover, the driving solenoid valve 7 receives the control signal.
6 excites the coil 76B and the coil 76A.
demagnetizes the cylinder chamber 40 of the driving cylinder 40.
An oil liquid 49 is introduced into B. As a result, the rod 42 of the drive cylinder 40 is pulled, the gripping device 16 is returned to the starting position C, and the limit switch 4 is
8 and stops. In this way, the driving electromagnetic valve 76 operates the driving cylinder 40 to cause the gripping device 16 to reciprocate between the starting position C and the ending position D.

Moreover, as shown in FIG.
is composed of a pressure equalizing valve 150, a differential pressure detector 152, and a pressure indicating gauge 154. Load detection device 5
0 is connected to cylinder chambers 40A and 40B of the driving cylinder 40 via connecting pipes 156 and 158. Piston 42A in the direction of arrow D shown in FIG.
When the cable 14 is slid, the cable 14 is gripped by the gripping device 16 and sent out in the direction of wire extension. In order to slide the piston 42 in the direction of arrow D, oil fluid 49 is supplied to the right cylinder chamber 40A, and the oil pressure _P1 in the right cylinder chamber 40A is maintained at a predetermined pressure. On the other hand, the oil 49 in the left cylinder chamber 40B is discharged at a constant discharge flow rate, and the oil pressure P ₂ in the left cylinder chamber 40B becomes smaller than P ₁ . When the load applied to the rod 42 is small, the rod slides smoothly, so the force applied to the piston 42A is small, and therefore the difference between the oil pressure P ₁ in the cylinder chamber 40A and the oil pressure P ₂ in the cylinder chamber 40B is small. Become. Conversely, when a large load is applied to the rod 42 due to the extension of the cable 12, the piston 42A does not slide smoothly, so the oil pressure _P1 of the right cylinder 40A on the oil pressure supply side increases, and the oil pressure P of the left discharge cylinder 40B increases. The difference between ₂ and 2 becomes larger. Therefore, the loads F acting on the left rod 42 are P ₁ and P ₂
It is a reaction force against the differential pressure of , and is expressed by the following equation.

Load value F=A( _P1 - _P2 ) In this way, the load when extending the cable 14 can be determined based on the differential pressure between the cylinder chambers 40A and 40B separated by the piston 42A.

The load measuring device 50 includes cables 14, 14 on which the gripping device 16 moves from a starting position C to an ending position D.
During the wire drawing process, the differential pressure between the cylinder chambers 40A and 40B of the drive cylinder 40 is detected. The load measuring device 50 detects that the differential pressure indicates the amount of load that the gripping device 16 receives when the cable 14 is stretched, so when the differential pressure exceeds a predetermined value, the control device 44 connected to the load measuring device sends a control signal. Control solenoid valve 7
Output to 4. Control solenoid valve 74 excites coil 85A. The control solenoid valve 74 operates a lock-up valve 78 to adjust the flow rate of the oil 49 flowing between the drive cylinder 40 and the drive solenoid valve 76, or to stop the flow of the oil 49. As a result, the operating speed of the piston 42 of the driving cylinder 40 is adjusted or stopped.

In FIG. 6, a control device 4 configured as described above is shown.
A flowchart illustrating the operation of No. 4 is shown.
The control device 44 uses the limit switch 122 to check whether the cables 14 . . . are set on the rollers 38, 38 in step 200. If the cables 14... are set, the control device 44 proceeds to the next step 202, and in step 202 operates the solenoid valve 96 that supplies the oil 49 to the gripping device 16 to close the gripping tools 28, 30. Rotate to. In step 204, the grippers 28, 3
It is confirmed by the strain gauge 120 whether the gripping force of 0 is within a predetermined value. If the gripping force is within a predetermined value, the process proceeds to step 206, and if it is greater than or equal to the predetermined value, the gripping force is too strong and the first stage ends.
In step 206, the lock-up valve control solenoid valve 94 is operated to close the lock-up valve 98;
The rotation of the grippers 28, 30 is stopped and the cables 14 are held under pressure.

In step 208, the gripping device 16 moves to the starting position C.
Alternatively, the end point position D is confirmed by the limit switches 46 and 48. If the gripping device 16 is in the starting position C, operation proceeds to step 210. In step 210, the coil 76A of the drive solenoid valve 76 is energized to push out the piston 42 of the drive cylinder 40. One hand gripping device 1
6 is at the end position D, the operation is step
Proceed to 212. In step 212, the driving solenoid valve 76
The coil 76B of the drive cylinder 40 is energized to attract the piston 42 of the drive cylinder 40, and then the step 200
Return to

After step 210, the process proceeds to step 214, where the differential pressure between the two cylinder chambers 40A and 40B of the driving cylinder 40 is measured by the load measuring device 50, and if the differential pressure is within a predetermined value, the process returns to step 208. , it stops if the load is above a predetermined value. In step 214, when the load is greater than or equal to the predetermined value,
The operating speed of the piston 42 of the drive cylinder 40 may be adjusted.

According to the wire drawing device according to this embodiment configured as described above, the wire drawing devices are arranged at predetermined intervals on the wire drawing route, and each wire drawing device is connected to the control device 44 and operated synchronously. be done. Open the gripping tools 28 and 30 and insert the plurality of cables 1 between the gripping tools 28 and 30.
4, 14... are set on the gripping device 16, the drive cylinder 40 is operated, and the gripping device 16 is moved to the starting position C.
to the end point position D. By this,
The cables 14, 14, . . . are pulled by the gripping device 16 and unwound from a drum (not shown). At this time, the gripping device 16 is adjusted and moved based on the load measuring device 50, the control device 44, and the cables 14, 1
4 is drawn with a tension below a predetermined value.

When the gripping device 16 reaches the end position D, the gripping tools 28, 30 are opened, the cables 14, 14, . The wire extending device extends the plurality of cables 14, 14, . . . by repeating the above operations.

In this way, the wire drawing apparatus of this embodiment has the gripping tool 2
Since the cables 14, 14, .

Furthermore, the movement of the gripping device 16 and the trolley 20 of the wire drawing device is controlled by strain gauges 120, 120.
Since the control device 44 controls the driving cylinder 40 and the gripping cylinders 36A and 36B based on the detection of the gripping force of No. 4 and the detection of the load value by the load measuring device, the cable 14 is gripped with an appropriate gripping force. The wire is stretched with appropriate tension, and the wire is stretched safely without suffering damage due to idle rotation of the rotating body as in the conventional method. In addition, the line extension equipment on the line extension route is
Since they are controlled by one control device 44, each wire stretching device can be easily controlled synchronously.

In the embodiments described above, the wire drawing device was installed horizontally, but it is not limited to this, and may be installed inclined or vertically. In this case, instead of the trolley 20, the gripping device 16 may be movably locked and held on the casing 10 via a locking rail or the like, so that it can be moved within the casing 10 even in an overturned state.

Further, in the above embodiment, the strain gauge 120 was used to measure the gripping force, but the invention is not limited to this, and pressure sensing devices are provided on the gripping surfaces of the gripping tools 28 and 30 to measure the gripping force. You may do so.

In the wire drawing apparatus of this embodiment, a load measuring device 215 as shown in FIG. 7 may be provided in place of the load measuring device 50 shown in FIG. The load measuring device 215 is provided with pressure detectors 216 and 218 that are independently connected to both cylinder chambers 40A and 40B of the driving cylinder 40, respectively, in place of the differential pressure detector 152 of the load measuring device 50. . The pressure detectors 216 and 218 are equipped with a computing unit 22.
0, the calibrators 222 are connected sequentially. The load measuring device 215 uses a calculator 220 to calculate measurement signals corresponding to the pressures in the cylinder chambers 40A and 40B detected by pressure detectors 216 and 218, and then calibrates the signal values using a calibrator 222 to generate a control signal. It is output to the control device 44 as . In this case, load measuring device 2
15 is independent of the type of operating fluid 49 used in the drive cylinder 40, and the cylinder chamber 40A,
Highly accurate pressure measurement within 40B is possible. For this reason, the method is not limited to hydraulic pressure, and air pressure or the like may also be used. Further, the load measuring device 215 can easily convert measurement signals obtained from the pressure detectors 216 and 218 into digital signals and output the digital signals to the control device 44.

〔Effect of the invention〕

As explained above, the wire drawing device according to the present invention includes a casing, a wire drawing device disposed in the casing so as to be movable back and forth along the wire drawing direction of the wire to be drawn,
There is a gripping device that grips the wire material to be drawn, and the gripping device moves in the direction of the wire drawing route while gripping the cable, and when it releases its grip on the wire material, the gripping device returns and moves back and forth. Since the apparatus is comprised of a moving device that stretches the wire rods along the wire drawing route, it is possible to simultaneously draw a plurality of wire rods and prevent damage to the outer skin of the wire rods.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a wire drawing device according to an embodiment of the present invention, Figs. 2 and 3 are sectional views of a gripping device, Fig. 4 is an explanatory diagram of a hydraulic system, and Fig. 5 is a load measuring device. 6 is a diagram showing an operation flow sheet of the control device shown in FIG. 4, and FIG. 7 is a schematic diagram showing a load measuring device for a wire drawing machine according to a modification of the present invention. 10... Casing, 10A... Casing socket, 14... Cable, 16... Gripping device,
20... Trolley, 28, 30... Gripping tool, 36A,
36B...Rotation cylinder, 37...Rotation cylinder rod, 38...Roller, 40...Driving cylinder, 42...Driving cylinder rod, control device...44, Load measuring device, C... Starting point position, D...Ending point position.

Claims (1)

[Scope of Claims] 1. A wire drawing device disposed on a wire drawing route along which a wire material to be drawn is drawn, wherein the wire drawing device has a casing and a curved gripping claw that faces the casing and can be freely expanded and contracted. A gripping device for the wire to be drawn is arranged so as to be able to reciprocate along the drawing direction of the wire to be drawn; a moving device for returning the gripping device to its original position in a state where the gripping device is released. 2. Claim 1, characterized in that the gripping device is provided with a grip detector that detects the gripping force on the wire material to be drawn, and the wire material to be drawn is drawn while adjusting the gripping force based on the detector. The wire extension equipment described. 3. A load detector is provided to detect the load applied to the drive unit of the moving device when the wire material to be drawn is stretched, and the tension applied during the drawing of the wire material to be drawn is adjusted based on the load detector. The wire stretching device according to claim 1, which extends wire. 4. The stretching device according to claim 1, characterized in that a control device for controlling the gripping device and the moving device is provided, and the timing of gripping the wire material to be drawn and the timing of movement of the gripping device are controlled based on the control device. line equipment.