JPS6369560A - Gate type crane with stabilizer - Google Patents

Abstract

PURPOSE:To surely detect the breakage of chains which hang and and lift a stabilizer only by respectively a pair of right and left detecting means, by detecting the tense state and loose state of all chains and deciding abnormality when the detectors deliver the outputs simultaneously. CONSTITUTION:Beams 5 hang work 6 and make simultaneous parallel and vertical movements. The stabilizer 20 is so disposed between the beams to suppress the oscillation of the work 6. Both ends of the stabilizer are hung by the chains 25 driven in synchronization with the vertical movement of the beams and the stabilizer is vertically moved together with the beams and is stopped en route. The stabilizer has an oscillation suppressing part 24 to release the suppression of the oscillation when the stabilizer stops so that the chains 25 hanging the part 24 are loosened and sagged by the continuous descending of the beams after the descending stop of the part 24. The two states; the state in which all the chains are tense and the state in which all the chains are loose, are detected by respectively separate detecting means 41, 42 on every one side of the chains and the chain breakage detector is operated by the signal by the simultaneous signal from both the means.

Description

[Detailed Description of the Invention] [Object of the Invention] L1 Upper Five Upper''±! The present invention relates to a surface treatment device for aluminum alloy shapes,
It is related to the gate-type crane used to suspend the workpiece and place it into various types of surface treatment equipment. More specifically, the present invention relates to a gate-type crane equipped with an anti-sway device that prevents objects to be processed from shaking during movement.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a conventional portal crane equipped with a swing stopper that can carry three beams will be described using FIG. 1, which is an embodiment of the present invention.

Traveling towers 1. arranged in parallel and connected by beams 3.3.
2 moves on rails 4, and as is well known, the beam 5 passed between both towers is moved up and down. A large number of objects 6 to be surface-treated are suspended from the beam 5, and one or several beams 5 with the objects suspended thereon are held on a lift table 7 and raised and lowered.

The lifting platform 7 is moved up and down by the movement of a chain 15 hooked onto sprockets 10-14 attached to the traveling towers 1 and 2. The position indicated by the solid line is the position when the traveling tower 1.2 is traveling, and when placed in the treatment tank, it is lowered to the position indicated by the two-dot chain line.

Since the workpiece 6 may sway during travel of the traveling tower and when the lifting platform 7 is raised and lowered, this crane is provided with a sway prevention device 20. This anti-sway device includes a fixed guide 21 whose one end is fixed to a beam 3, a movable guide 22 that moves up and down along this fixed guide 21, a restraint part 24 arranged at the tip of the movable guide 22, and a restraint part 24 disposed at the tip of the movable guide 22. A chain 25 that suspends the section 24, moves it up and down, and operates it.
It is composed of. One end of the chain 25 is connected to the chain 15 for raising and lowering the lifting platform 7 at a point 26, and the other end is attached to the tip of the restraining part 24. Therefore, the restraining part 24 descends together with the beam 5 while being suspended by the chain 15. This anti-sway device is inserted between each beam 5, and is also placed on both sides of the beam 5 in the forward and backward directions. That is, the object to be processed 6 suspended from one beam 5 is sandwiched between the restraining portions 24 .

A stopper 27 is installed at the lower end of the fixed guide 21,
A locking piece 28 is provided at the upper end of the moving guide 22 to be applied to the stopper 27.

That is, the stopper 27 and the locking piece 28 allow the restraining portion 24 to descend only from the position indicated by the solid line to the position indicated by the two-dot chain line.

This is approximately half the amount of movement of the beam 5. This is to prevent it from entering the tank. When the restraint section 24 stops descending, the restraint section 24 operates as described later and releases the restraint on the object to be processed.

In this way, the restraining section 24 is stopped halfway, but the beam 5 is further lowered. The descent is due to the chain 15 as mentioned above, and since the chain 25 is connected at one end at the point 26, the following chain 15
The chain 25 is further fed by the movement of the chain 25. However, since the moving guide 22 and the restraining part 24 are stopped, the beam 5 hangs down as shown by the two-dot chain line 25a.If the workpiece 6 is to be lifted up after the surface treatment, the chain 15 is rotated in the opposite direction to raise the beam 5. But then chain 2
5, the part that hangs down at first is pulled up, and when the hanging part is finished and is in a tensioned state, the restraining part 24 is pulled up.

In other words, during surface treatment, the restraint part 24 is kept at the position indicated by the two-dot chain line, and the restraint is released. The object to be processed 6 is prevented from shaking, and is raised together with the beam 5.

The structure of the restraining part 24 will be briefly explained below based on FIG. 2 (see Japanese Patent Application Laid-Open No. 58-2124 for details). It is composed of a V-shaped lever 32, with a restraining part 33 attached to one end thereof to suppress shaking, and the other end 34 attached to one end of a lever 35 for rotation. The other end of this lever 35 is attached to the tip of the chain 25. Therefore, in the inhibited state, the chain 25
When it is tense, it is in the state shown by the solid line in the figure, and the restraining part 33 is brought close to the object to be processed 6 to prevent it from shaking. On the other hand, in the restraint open state when the chain 25 is loosened, the restraint part 33 is directed downward and widened to the extent that the beam can pass through, as shown by the two-dot chain line.

In the above conventional system, the chain 25 eventually connects the restraining part 24.
Raise and lower the chain 25 while keeping it in a restrained state, and
The restraints are released by loosening the restrictions. There is no particular problem when lowering the workpiece 6 into the processing tank, but when lifting it up, the chain 2
5 is changed from a relaxed state to a tensioned state, and the restraining portion 24 is pulled up. Since the restraining part 24 in the stopped state is suddenly pulled from the loosened state, the chain 2
5, an impact force is applied. Moreover, when the object to be processed is pulled up, it is pulled up at a fairly high speed in order to reduce loss time, so the impact force applied to the chain 25 becomes considerable. The chain 25 may break due to this impact.

When this chain breaks, the restraint part connected to the chain falls, damaging the object 6 to be processed.

Moreover, since the system is in normal automatic operation, even if the chain 25 breaks, an attempt is made to continue the operation, which may result in damage to the entire device.

Further, since the restraining section 24 is also operated suddenly, the restraining section 33 may hit the object to be processed 6 and damage the object to be processed 6.

The present invention has been made to solve such problems.

[Structure of the Invention 1 1J To Divinate Therefore 1 The first invention detects the tensioned state and loosened state of the chain by separate detection means and outputs a signal, so that the signal is applied from both sides at the same time. The chain is characterized by being equipped with a detection device that determines that the chain is broken when the chain is broken.

An arm with one end rotatably attached to an appropriate position and the other end attached to a chain is installed at the same location on each chain, and a light-emitting element is placed at each of two locations: the location where the chain is stretched and the location below that location. It is desirable to provide a detection means consisting of a light-receiving element and a light-receiving element.

Further, a second invention is the first invention with the addition of a deceleration means for slowing down the speed at which the chain is pulled in order to alleviate the impact force applied to the chain. It is configured to operate by detecting the moment immediately before the change occurs.

1” 'jbefHT:keys? ;twViE+-)IUl
-4My&++ are arranged in parallel. The anti-sway device prevents the workpieces suspended from each beam 5 from being
It will be sandwiched between 4. Chain 2 is attached to the left and right ends of the restraint part.
5 is attached, the number of chains 25 on one side is one more than the number of beams. Moreover, since they are on both the left and right sides, there are twice as many chains. If even one of the chains breaks, it is no good, so originally it is necessary to install a chain breakage detection device for each individual chain.However, as in the first invention, when the entire chain (only one side) is tensioned, one If you send a signal and send another signal when the chain loosens, and if these signals are applied at the same time to indicate a chain breakage, then a set of one for each left and right would be sufficient.

As mentioned above, there are multiple chains 25, but they are always parallel. Also, the probability that all the chains will break at the same time is extremely low, and should be said to be almost impossible.If all the chains are not broken, they will be under tension at the same time, and they will also loosen at the same time. If you give a signal in a tense state and give a signal in a drooping, relaxed state,
These signals do not overlap at the same time; they only overlap when one is in a state of tension and the other is in a state of relaxation. The fact that something is in a relaxed state when it should be in a taut state is when the chain 25 breaks. That is,
It is possible to know that any one of the plurality of chains 25 has broken.

Normally, upon detection of this chain breakage, the entire device is stopped and a notification is made.

Further, as described above, the chain 25 is moved together with the chain 15 that raises and lowers the beam 5. Since time is wasted while the beam is rising, the faster the speed, the better.
Therefore, the chain 15 is moving at a considerable speed.

At the time of pulling up, the chain 25 is initially in a relaxed state.

While hoisting this up, the device 20 is suddenly tensioned at a certain point to lift the anti-swaying device 20. An impact force is applied to the chain 25 during this transition to the tensioned state. This impact force becomes larger as the lifting speed of the beam 5 is faster, and the possibility of the chain breaking increases. Therefore, by detecting just before the chain 25 becomes tensioned and slowing down the rising speed of the beam 5 as in the second invention, this impact force is reduced, and the possibility of the chain 25 breaking can be further reduced. At the same time, the operation of the suppressing section 24 becomes gradual.

The suppression line 33 no longer hits the object 6 to be processed.

EXPERIMENTAL EXAMPLE An embodiment of the present invention will be described below, but the description of the conventional example will be omitted since it is redundant. This embodiment is a crane that transports three beams. FIG. 1 is a front view, and there is a width from front to back of the page. Therefore,
The beams 3 are provided at the front and rear of the running direction, and the beam 3 on the upper side
In between, as shown in FIG. 3, a stand 30 is used as a handover. On this stand 30, four sprockets 31 of the chain 25 are arranged at regular intervals δ (FIG. 3).

A chain 25 is attached to each sprocket 31. Each chain has an arm 32 as shown.
is installed. As shown in FIG. 4, this arm 32 is rotatably attached to a bearing 33 fixed at one end 32a to a stand 30, and at the other end is a chain hook 34 provided with sprockets 35a and 35b for hanging the chain 25.
is installed. Therefore, when the chain 25 is tensioned, the arm 32 is stabilized by the chain 25 in a diagonally upward position as shown by the solid line in FIG. 2 points! It decreases as shown by Am. If you look at the arm 32 of the same shape from the side, the chain 2 will appear as shown in Figure 4.
In the tension state of 5, this arm 3 is lined up with the same inclination.
A light emitting element 37, 38 is placed on one side of the outside of the 2, and a light receiving element 39, 40 is placed on the other side. The light-emitting element 37 and the light-receiving element 39 constitute a first photoelectric switch 41 as a detection means that outputs an output when the chain 25 is tensed, and the first light-emitting element 39 and the light-receiving element 40 generate an output when the chain 25 is relaxed. A second photoelectric switch 42 is configured to output the light. The second photoelectric switch 42 is connected to the first photoelectric switch 41 as shown in FIG.
It is desirable to place it slightly below the

These arms 32. Photoelectric switches 41 and 42 are provided on both the left and right chains 25. The circuit configuration of this photoelectric switch is as shown in FIG. 5. In FIG. 0, R and L added to the numbers mean right and left, respectively. Since both are the same, only one will be explained below.

Each photoelectric switch 41.42 has a relay 43.44 respectively
It is connected to the. Further, the contacts of those relays are connected in series to an abnormality detection relay 45. A lamp 46 is connected in parallel to this relay 45, and an abnormality (
It is designed to notify you when the chain breaks. Further, a contact 45 connected in parallel to the contact 44 is a contact of a relay 45, and is used for self-holding.In this embodiment, the operation of the entire device is brought to an emergency stop by the operation of this abnormality detection relay 45. Switch t1 in Figure 0 is an abnormality release switch.

This embodiment further includes two switches 50.51 operated by the lifting platform 7 on either one of the traveling bases 1.2.
is installed. The position of the switch 50 is the chain 25
The switch 51 is at the position n of the beam 5 when the chain 25 has already been tensioned and the sway stopper i20 has just started to pull it up. . The switch 50 operates a deceleration means for slowing down the speed of a motor (not shown) that pulls up the beam 5, and the switch 51 is used to stop the operation of the deceleration means and restore the speed. Both of these switches operate only when the motor rotates in a direction to pull up the beam 5. When the beam 5 is lowered, that is, when the workpiece 6 is put into the tank, the speed is slow and the chain 25 changes from a tensioned state to a relaxed state, so there is little risk of it breaking. This is because there is no particular problem since the locking mechanism also operates in the inhibiting/releasing direction. During pulling, the pulling speed is increased to improve processing efficiency, while the chain 25 changes from a relaxed state to a tensioned state, so a strong impact force is applied to the chain 25 at that time. The moment when the chain 25 changes from a relaxed state to a tensioned state by the operation of the deceleration means by the switch 50, in order to reduce the impact force and prevent the chain 25 from breaking as much as possible, and to allow the restraining part 24 to operate gently. In this case, the rising speed of the beam 5 is reduced.

Furthermore, in this embodiment, the device is stopped when the beam 5 becomes out of parallel and becomes oblique.In this embodiment, the chain 15 is moved by separate motors on both the left and right sides, so that the chain 15 can be moved easily. If the speeds do not match, beam 5 cannot be kept parallel; if one side is delayed for some reason, beam 5
This is to prevent the objects 6 from colliding with each other and being damaged or coming off, which is dangerous. Therefore, a timer (not shown) is provided that operates simultaneously with the start of the motor, so that if the motor does not stop within a certain period of time, the entire device stops.

The operation of the above embodiment will be described below, but the portions explained in the conventional example will be omitted. When the traveling bases 1 and 2 travel on the rail 4 and come over one processing tank, they stop, and a motor (not shown) is driven to lower the beam 5 via the chain 15, at which time the chain 25 is in a tensioned state. Therefore, the light from the light emitting element 37 is blocked by the four wooden arms 32 and the light from the light receiving element 38 is blocked by the four wooden arms 32.
Therefore, the output of the photoelectric switch 41 is output, operating the relays 43R and 43L.

Although the contacts 43R and 43L are on, the contacts 44R and 44L connected in series with them are off, so the abnormality detection relay 45 does not operate.

The restraining part 24 of the anti-sway device also descends together with the beam 5,
When the locking portion 28 hits the stopper 27, the restraining portion 24 stops descending. Therefore, the chain 25 starts to loosen,
While the deterrent unit 24 operates in the direction of releasing the deterrence,
Arm 32 rotates. This arm is the photoelectric switch 41
After passing the position, the relays 43R and 43L return to their original positions, and their contacts 43R and 43L are turned off. As the chain 25 further loosens, the arm 32 moves to the photoelectric switch 42.
Rotate it to the position and operate it.

Therefore, relays 44R and 44L operate and their contacts 44
R and 44L are turned on, but contact 43R is turned on as described above.
Because 143L is off.

Arm 32 in which abnormality detection relay 45 does not operate
If the current passes through the positions of these photoelectric switches, all relays become inactive because both photoelectric switches have no output. Since the photoelectric switches operate separately when the beam rises, it will be understood that the abnormality detection relay 45 does not operate.

When all the chains 25 are under tension, if any chain 25 breaks, the arm 32 attached to the broken chain 25 rotates. At that time, the photoelectric switch 42 momentarily outputs an output, so the relay 4
4R is also activated, and contact 44R is turned on as well as contact 43R, which had been turned on, so abnormality detection relay 45 is activated, stopping the operation of the device, and lighting lamp 46 to notify that the chain has broken. The chain 25 is most likely to break at the moment when a load is applied as described above, that is, at the moment when the arm 32 is in the state shown in FIG. 4, so each chain 25 is likely to break. Even without providing a detection device, it is possible to sufficiently achieve the desired purpose with just one set for each of the left and right sides.

Photoelectric switch 42 that operates when chain 25 breaks
The position of the photoelectric switch 4 may be any position as long as it operates when the arm 32 rotates, but if possible,
A value close to 1 is desirable.

The loosening of the chain 25 causes the restraint 24 to release the restraint, so that the beam 5 further descends through this restraint 24 to the position indicated by the two-dot chain line. After the processing is completed, a motor (not shown) is rotated in the reverse direction to pull up the beam 5.

The rotational speed of the motor during lifting is fast, and the beam 5 is raised rapidly. The movement of the chain 15 at this time pulls up the hanging portion 25a of the chain 25. Just before the chain 25 is hoisted and tensioned, the beam 5 operates the switch 50. Therefore, the deceleration means operates to slow down the rotation of the motor. Therefore, after that, the beam 5 slowly rises, the chain 25 is pulled up slowly, and the state is gently shifted to the tensioned state. At the same time, the chain 25 shifts to the tensioned state, causing the restraint section 24 to
It also moves in the direction of deterrence, but its movements are also gentler.

After the chain 25 is tensioned and the restraint 24 is activated, the beam 5 activates the switch 51, the motor is sped up again, and the beam 5 rises quickly.

[Effects of the Invention] As described above, according to the present invention, the tension state and the relaxed state of the entire chain (on one side) are detected, and an abnormality is determined when the output is output at the same time. Breaking of the chain 25 for hanging and lifting can be reliably detected by simply providing a pair of detection means on each side.

moreover! According to the lR2 invention, the lifting speed of the chain 25 is slowed down just before it changes from a loose state to a tensioned state, so the possibility of the chain breaking is reduced, and the swing prevention device prevents the workpiece from being processed. There is no risk of injury.

[Brief explanation of the drawing]

Fig. 1 is a front view of an embodiment of the present invention, Fig. 2 is a side view of the vicinity of the restraining part of the anti-sway device, Fig. 3 is a plan view of the part where the arm is attached, and Fig. 4 is a side view thereof. Figure 5 is a circuit diagram of a photoelectric switch. 5: Beam, 6; Workpiece, 20: Shaking stop device, 24
: Suppressing part, 25: Chain, 32: Arm, 41.42
: Photoelectric switch, 45: Abnormality detection relay.

Claims (2)

[Claims] (1) A gantry crane with anti-sway device having the following A to C. A: One or more beams on which the objects to be processed are suspended and moved in parallel and vertically at the same time; B: One or more beams on which the objects to be processed are suspended, and on both the front and back sides of the beams, and if there are multiple beams, a beam that prevents the objects from swinging between the beams. placed in
Both ends are suspended by a chain driven in synchronization with the vertical movement of the beam, and the beam is moved up and down along with the beam and stopped in the middle, and has a sway suppression part that releases the sway suppression when the beam stops, and the sway suppression part A shaking prevention device in which the chain hanging the shaking restraining part loosens and hangs due to the continued descent of the beam after the beam stops descending; A chain breakage detection device that detects two states, a loose state and a loose state, using separate detection means, and operates by applying signals from both at the same time. (2) Gate-type crane with anti-sway device having the following A to D. A: One or more beams on which the objects to be processed are suspended and simultaneously moved in parallel and up and down; B: One or more beams on both the front and back sides of the beam, and if there are multiple beams, a beam that prevents the objects from swinging between the beams. placed in
Both ends are suspended by chains that are driven in synchronization with the vertical movement of the beam, and the beam is moved up and down with the beam and stopped midway, and has a shaking suppression part that releases the shaking suppression when the beam stops, and the shaking suppression part A shaking prevention device in which the chain hanging the shaking restraining part loosens and hangs due to the continued descent of the beam after the beam stops descending; D. A chain breakage detection device that detects two states, a loose state and a loose state, using separate detection means and operates when signals are applied from both at the same time.D. A deceleration means that reduces the rising speed of the beam.