JPH054313B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention can be used to pick up iron materials such as industrial waste and dismantled products and transfer them with either two claws or four claws. This relates to a lifting magnet equipped with a gripping machine.

[Problems with conventional technology]

In the case of a lifting magnet, as the temperature of the electromagnetic coil rises, the resistance increases and the current decreases, so that the attractive force decreases by about 1/4.

Therefore, there is a drawback that the hanging amount varies significantly depending on changes in the environmental temperature during work.

In particular, items with poor purity that are said to be junk, such as washing machines, automobiles, electric fans, and other household waste and miscellaneous items, dismantled car bodies, dismantled lightweight steel frames, dismantled reinforced concrete, entangled reinforcing bars, bent This tendency is particularly pronounced for loose objects, and the hanging ability decreases at high temperatures.

The conventional means of compensating for the above-mentioned drawbacks of the lifting magnet are to provide a club with a gripping device separate from the one for the lifting magnet and use both as separate equipment, or to use the lifting magnet as a separate club. It is used separately when using the lifting magnet and when replacing the lifting magnet with a gripping machine.

In the above method, the former requires double investment in equipment, which increases costs, and in addition, the work scope is narrow and the amount of steel material that can be stored within the building site decreases, and the latter requires time to replace the gripping machine. There were problems such as failures and reduced work time.

In order to solve these problems, the applicant proposed a new technology in Utility Application No. 142169/1982 and Japanese Patent Application No. 267479/1982.

In other words, it is a combination of a lifting magnet and a gripping device with four claws, and since the gripping device assists when the magnet's suction capacity is insufficient or the suction capacity decreases, the magnet can be made lighter and smaller. Not only can the overall weight be reduced, but it also has many advantages, such as eliminating the risk of iron materials falling during transportation.

However, the iron material to be gripped does not necessarily have a shape that can be gripped with four claws; for example, a long iron material can only be gripped with two claws.

The present invention is a lifting device equipped with a gripping machine that can grip such long objects with only two claws, and grip other iron materials with four claws, and can easily switch the number of claws used. It provides magnets.

[Means to solve the problem]

In the present invention, the lower end of the main cylinder is pivotally attached to the upper part of the lifting magnet, which has an attraction surface on the lower surface that is excited by electricity, and a main column and a plurality of brackets are fixedly attached, and a trunnion is attached to the upper end of the column. a lower branch type bracket having two arms is fixed to the tip of the piston rod of the main cylinder, and an upper branch type bracket that can be fitted into and removed from the lower branch type bracket is provided with two arms; The middle part of the upper arm, one end of which is pivotally connected to the bracket, and each of the arms are connected by a sub cylinder, and the arm moves from the hanging position below the lifting magnet to the upper position by expansion and contraction of the main cylinder and the sub cylinder. The lower branch type is constructed so that it can be rotated to a storage position, and the end of the lower arm is pivotally connected to the other end of the arm, and a locking device is provided for locking the lower arm in a used state and a folded state. A pin fitting/disconnecting device for engaging and disengaging the bracket and the upper branch type bracket, and a pin fitting/disconnecting cylinder for engaging and disengaging the upper branch type bracket and the trunnion are provided.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings.

In FIGS. 1 and 2, the lifting magnet 1 has four arms 2b having a fork 2a at the tip and protruding outward on the opposite surface (upper surface) of the suction surface 1a.
A main support frame 2 having a pin 4 for pivotally supporting the main cylinder 3 is fixed to the upper center thereof.

Further, a square columnar main column 5 having a guide groove 5a formed in the upper half of each side is fixed to the upper surface of the main column frame 2, and a trunnion 6 is attached to the upper end surface of the main column 5.
is installed.

A male thread 3b is threaded on the tip of the piston rod 3a of the main cylinder 3, and the male thread 3b is threaded into a female thread 7b and a nut 8 threaded into a lower branch type bracket 7 having two forks 7a. match.

The nut 8 functions as a tightening nut to prevent loosening of the threaded connection between the male thread 3b and the female thread 7b, and the outer peripheral surface of the nut 8 is inserted into the inner peripheral surface of the upper branch type bracket 9.

As shown in FIG. 9, the upper branch bracket 9 has two forks 9a in a direction orthogonal to the forks 7a of the lower branch bracket 7.

A pin insertion hole 10 is laterally bored in the upper branch type bracket 9 and the nut 8.
The pin 12, which moves forward and backward, is inserted or pulled out by the pin insertion/removal device 11.

The upper part of the upper branch type bracket 9 is connected to the trunnion 6.
A fork 9a is formed adjacent to both side surfaces of a boss 13 protruding from the outer bottom surface of the fork 9a, and a pin insertion hole 14 is formed in the fork 9a and the boss 13.

Reference numeral 15 denotes a pin insertion/removal cylinder for inserting or extracting a pin 16 into or out of the pin insertion hole 14.

10 to 12 show the pin fitting and dismounting device, and a base 11b suspended by a pillar 11a hanging from the outer bottom surface of the trunnion 6 has carriages 1 on both sides.
It has a guide sliding surface 11d of 1c.

A clamp opening/closing cylinder 1 is mounted on a carriage 11c that reciprocates as the cylinder 11e expands and contracts.
Due to the expansion and contraction of 1f, the clamping device 11g is attached to the pin 12.
Unclamp or clamp.

Reference numeral 11h denotes a contact plate that comes into contact with the end face of the pin by the elastic force of the spring 11i.

Reference numeral 11j is a stroke end stopper on the forward side of the carriage 11c.

The upper arm 20 has one end pivotally connected to the fork 2a by a shaft 17, and the other end has a lower arm 19 pivotally connected to the fork 2a by a shaft 18. It is pivotally connected to the tip of the rod 21a by a shaft 22', and can be rotated from the folded position shown above the magnet 1 by a chain double-dashed line to the position shown below by a solid line by the expansion and contraction of the main cylinder 3 and the sub cylinder 21. It is possible to move.

Reference numeral 22 denotes a lock mechanism provided on the upper arm 20 side, and as shown in FIGS. 13 and 14, lock holes 19a and 19b formed in the lower arm 19 (see FIG. ) and a lock pin 22b that removably engages with the lock pin 2.
2b against the elastic force of a spring 22c, and an L-shaped connecting arm piece 22e that connects the piston rod 221d of the hydraulic cylinder 22d and the lock pin 22b. .

When the lock mechanism 22 is locked, the piston rod 221d retreats and the lock pin 22b protrudes due to the elastic force of the spring 22c, thereby locking the lock hole 19.
a, 19b, and when the lock is released, the piston rod 221d moves forward and pushes the lock pin 22b into the lock hole 19a, against the elastic force of the spring 22c.
Pull it out from 19b.

As shown in FIG. 15, the trunnion 6 is provided with a bearing 16b on a base 16a fixed to the main support 5, and the bearing 16b rotatably supports a shaft 16c.

A pin 16 protrudes from both sides of the central portion of the shaft 16c.
d is pivotally connected to the rotating shaft 23a of the rotational drive device 23.

On the lower surface of the base 16a, there are a boss 13, a base 11b suspended by the pillar 11a, and a pin insertion/removal device 15.
A mounting seat 16e is provided.

As shown in FIGS. 16 and 17, the rotation drive device 23 has a cylinder 23d that hermetically accommodates an upper end 23b and a flange 23c of a rotating shaft 23a. A partition plate 23e is provided on the inner circumferential surface of the cylinder 23d to partition a space defined by the outer circumferential surface.

Further, a fan-shaped rotor 23g is fixed to the upper end portion 23b, and has seal portions 23f at both ends that are in close contact with the inner circumferential surface of the cylinder 23d.

In the cylinder 23d, oil inlets 23h and 23j are formed on both sides of a partition plate 23e, and oil outlets 23k and 23l are formed on the opposite side thereof.

Therefore, when hydraulic oil is pressurized from the oil inlet 23h, the fan-shaped rotor 23g can rotate from the solid line position to the two-dot chain line position.

Along with this, the rotating shaft 23a horizontally rotates the trunnion 6 and the entire device suspended below it.

When hydraulic oil is forced into the oil inlet 23j, the rotating shaft 23a rotates the trunnion 6 and the entire device in the opposite direction.

In this embodiment configured as above, 4
When grasping a steel material using the upper arm 20 and lower arm 19, first shorten the pin insertion/removal cylinder 15 and remove the pin 16 to release the engagement between the upper branch type bracket 9 and the boss 13. At the same time, remove the pin 12 from the upper bracket 9 and nut 8.
and combine the upper bracket 9 and lower bracket 7 into a branch type bracket having four forks.

The operation of inserting the pin 12 is performed as follows.

That is, by shortening the clamp opening/closing cylinder 11f, the clamp device 11g is in a state of gripping the pin 12, and by shortening the cylinder 11e, it remains retracted together with the carriage 11c.

When the cylinder 11e is extended from this state and the carriage 11c is brought into contact with the forward stroke end stopper, the clamp device 11g that clamps the pin 12 moves forward, and the pin 12 is inserted into the hole common to the upper bracket 9 and the nut 8. 8.

Next, the clamp opening/closing cylinder 11f is extended to open the clamp device 11g, and the cylinder 1
Due to the shortening of 1e, the clamping device 11g moves back together with the carriage 11c.

Next, in order to start the operation of grasping the iron material from the state in which the upper arm 20 and the lower arm 19 are housed in the magnet 1, the piston rod 221d is advanced by the hydraulic cylinder 22d and the lock pin 22b is moved forward.
Pull it out from the lock hole 19a to release the folding lock.

Then, when the sub cylinder 21 is extended, as the upper arm 20 rotates, the lower arm 19 always takes a downward attitude due to its own weight, so it continues to open with respect to the upper arm.

Along with this, the lock pin 22b is
9 and when it reaches the position of the lock hole 19b, the elastic force of the spring 22c closes the lock hole 19b.
is engaged and locked in use.

In this state, the lifting magnet 1 is operated to suck up the iron materials, and after gathering the iron materials, the main cylinder 3
When shortened, the upper arm 20 and the lower arm 19 shift to the grasping state shown in solid lines in FIG.

At this time, it goes without saying that the upper branch type bracket 9 and the lower branch type bracket are combined and lowered according to the piston rod 3a.

Next, the entire device is raised to lift the grabbed iron material, and the crane is moved horizontally to transport it to a predetermined position.

Next, when the iron material is long and cannot be grasped using the four upper and lower arms 20, 19, only the two upper and lower arms 20, 19 connected to the lower branch type bracket 7 are used. use.

That is, the main cylinder 3 is extended to bring the height of the upper branch bracket 9 to the height shown in FIG.

Next, the cylinder 15 is extended, the pin 16 is inserted into the upper branch type bracket 9 and the boss 13, and the upper branch type bracket 9 is locked to the boss 13 so as not to be moved.
2 is clamped, the clamp 11g is moved back, and the pin 12 is removed from the upper branch type bracket 9.

Thus, the upper bracket 9 is connected to the lower bracket 7.
As the engagement is released, it is suspended from the boss 13 by the pin 16.

Therefore, the two upper and lower arms 20, 19 pivotally attached to the upper bracket 9 can be stored in the retracted position shown by the two-dot chain line in FIG.

On the other hand, by using only the sub cylinder 21 and the main cylinder 3 which are pivotally connected to the upper arm 20 which is pivotally connected to the lower bracket 7, it is possible to carry out the same operation and grasp a long object.

Two claws (upper and lower arms) according to the direction of long objects
The rotational drive device 23 may be used to correct the orientation.

〔effect〕

The present invention has the following effects.

(a) Since the gripping machine and retaining magnet are combined, even if a power outage occurs during work, the iron material will be held by the gripping machine and there is no danger of it falling. Furthermore, since the gripping device assists in the case of insufficient adsorption capacity or decreased suction capacity of the magnet, the heavy magnet can be made lighter and smaller, and the overall weight of the device can be reduced.

(b) This device can perform both four-jaw grasping and two-jaw grasping with one device, so if there are long objects among the iron materials to be grasped that cannot be grasped with four claws. With this device, you can also grab it without any problems.

(c) Switching between 4-claw operation and 2-claw operation can be easily performed by switching the hydraulic circuit using a solenoid valve, etc., and expanding and contracting the hydraulic cylinder to engage and remove the pin. It is simple and allows you to select between a single branch type bracket and a combination of branch type brackets in a short time.

(d) The posture of the two claws can be easily adjusted by the rotary drive device according to the direction in which the long object faces.

[Brief explanation of drawings]

1 to 17 show embodiments of the present invention. FIG. 1 is a front view of the entire device, FIG. 2 is the same as above (partial sectional view), and FIG. Figure 4 is a front view of the main strut, Figures 5 and 6 are sectional views of AA and BB as above, Figure 7 is a front view showing the mounting relationship of the upper branch type bracket, Figure 8 is a side view of the same as above, Figure 9 is a front view of the main support.
10 is a front view of the pin fitting/removal device, FIG. 11 is a plan view of the same as above, FIG. 12 is an explanatory diagram of the structure of the plate, FIG. 13 is a front view of the locking mechanism,
4 is a side view of the same, FIG. 15 is a front view of the trunnion, FIG. 16 is a front view (partially longitudinal sectional view) of the rotary drive device, and FIG. 17 is a plan view of the same. DESCRIPTION OF SYMBOLS 1...Lifting magnet, 2...Main support mount, 3...Main cylinder, 5...Main support, 6...Trunion, 7...Lower branch type bracket, 9...Upper branch type bracket, 11...Pin fitting/removal device, 12... pin, 1
5... Pin insertion/removal cylinder, 16... Pin, 19... Lower arm, 20... Upper arm, 21... Sub-cylinder,
22...Lock mechanism, 23... Rotation drive device.

Claims (1)

[Scope of Claims] 1. The lower end of the main cylinder is pivotally attached to the upper part of a lifting magnet whose lower surface is provided with an attraction surface that is excited by electricity, and a main column and a plurality of brackets are fixed, and the upper end of the column is A trunnion is connected to the main cylinder, a lower branch type bracket having two arms is fixed to the tip of the piston rod of the main cylinder, and two arms are attached to an upper branch type bracket that can be inserted into and removed from the lower branch type bracket. The intermediate portion of the upper arm, one end of which is pivotally connected to the bracket, and each of the arms are connected by a sub cylinder, and the arm is moved to a hanging position below the lifting magnet by expansion and contraction of the main cylinder and the sub cylinder. The lower arm is pivotably connected to the other end of the arm, and is provided with a locking device for locking the lower arm in a used state and a folded state. A lift with a gripping device, characterized in that it is provided with a pin fitting/disengaging device for engaging and disengaging a lower branch type bracket and an upper branch type bracket, and a pin fitting/disengaging cylinder for engaging and disengaging said upper branch type bracket and said trunnion. Teing magnet.