JP2799232B2 - Counterweight attachment / detachment device for vehicle type cranes - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an apparatus for attaching and detaching a counterweight to and from a swivel provided on a vehicle body of a vehicle type crane.

[Conventional technology] Generally, vehicle-type cranes such as truck cranes include:
Some types have a boom provided on a swivel provided on the vehicle body.In this type of vehicle type crane, when using as a crane, a counterweight is detachably attached to the rear of the swivel to lift the load. There is a type in which the counterweight is removed from the swivel base and mounted on the vehicle body when the vehicle travels while balancing the load with the boom. The vehicle type crane of this type is provided with a device for attaching and detaching the counterweight to and from the swivel.

Conventionally, as a counterweight attaching / detaching device for a vehicle type crane, a counterweight support frame is slidably provided on a turntable provided on the body of the vehicle type crane, and a first hydraulic cylinder is provided between the turntable and the support frame. Further, there is disclosed a configuration in which an arm for mounting the counterweight is rotatably provided on the counterweight support frame, and a second hydraulic cylinder is provided between the arm and the counterweight support frame (actual opening). Showa 47-30257
issue).

The counterweight attaching / detaching device performs the following operation when the counterweight on the vehicle body is mounted on the swivel base. The piston rod is advanced and extended to the first hydraulic cylinder to extend the counterweight support frame.
The arm is locked to the counterweight support frame by the second hydraulic cylinder, and is further rotated to the swivel side to be supported by the support frame. The first hydraulic cylinder is retracted with the piston rod retracted, and the counterweight is mounted on the swivel base via the support frame.

The counterweight is removed from the swivel table by performing the reverse operation.

[Problems to be Solved by the Invention] However, such a counterweight attaching / detaching device has the following problems.

That is, in this counterweight attaching / detaching apparatus, the counterweight is moved up and down in the direction in which the arm is moved toward and away from the swivel base, and the counterweight is moved horizontally in the direction in which the counterweight is moved in and out of the swivel base with the support frame. Is attached to and detached from the swivel.

Accordingly, a hydraulic cylinder for horizontal movement that drives a support frame that horizontally moves the counterweight in the direction of moving toward and away from the swivel table, and an arm that moves the counterweight up and down in the direction of moving and moving the counterweight toward and away from the swivel table are driven. It is necessary to equip two sets of hydraulic cylinders for moving up and down, and two sets of hydraulic circuits for driving each of the hydraulic cylinders are required, resulting in a problem that the configuration is complicated and the economy is low.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a counterweight attaching / detaching apparatus for a vehicle type crane which has a simple structure for moving the counterweight and is economical.

[Means for Solving the Problems] To achieve the above object, a counterweight attaching / detaching apparatus for a vehicle-type crane according to the present invention is an apparatus for attaching / detaching a counterweight to / from a swivel provided on a vehicle body of a vehicle-type crane, A drive cylinder for pivotally supporting one end to the swivel base and projecting from the other end so as to be detachably engaged with the counterweight and moving the counterweight by a forward or backward movement of the piston rod; When moving the counterweight on the vehicle body by moving the piston rod forward or backward, the counterweight is guided upward and moved to the swivel base, and the counterweight at the swivel base is moved to the swivel base. When moving the piston rod forward or backward, the counter And a guide member for guiding the eight downward and moving it on the vehicle body.

[Operation] When attaching the counterweight to the swivel, the drive cylinder guides the counterweight on the vehicle body upward toward the swivel with the guide member while moving the counterweight horizontally, and when removing the counterweight from the swivel, Since the drive cylinder guides the counterweight on the swivel table downward toward the vehicle body while moving the counterweight horizontally,
By simply combining a set of drive cylinders and a guide member having a simple configuration, the counterweight can be attached to and detached from the swivel table without having to provide two sets of cylinders.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

This embodiment is applied to a truck crane as a vehicle type crane.

FIG. 5 shows a truck crane. In the figure, reference numeral 1 denotes a vehicle body, 2 denotes a swivel table provided on the vehicle body 1, 3 denotes a telescopic boom provided on the swivel table 2, 4 denotes an up / down cylinder, 5 denotes a lifting hook, and 7 denotes an outrigger. O is the center of rotation of the swivel 2.

FIG. 1 shows a case in which the counterweight 8 is used as a crane. In this case, a counterweight 8 is attached to the lower corner of the rear portion of the swivel 2. When traveling on the vehicle body 1, the counterweight 8 is placed at an intermediate portion of the vehicle body 1 as shown by an imaginary line.

The counterweight attachment / detachment device to which the present invention is applied is provided at the lower corner of the rear portion of the swivel base 2. The counterweight attachment / detachment device will be described below with reference to FIGS. 1 to 3 are side sectional views, and FIG. 4 is a plan view. In the drawing, when the counterweight 8 is attached to the swivel 2, the counterweight 8 moves from the right side to the left side in the figure, and when it is removed, the counterweight 8 moves from the left side to the right side in the figure.

9 is a main body frame in the figure. The main body frame 9 is configured by connecting a pair of side wall portions horizontally arranged facing each other by a first guide portion 10 and a second guide portion 11 which are guide members. The first guide portion 10 is located at a lower portion of an end of the main body frame 9 facing the center of the swivel table, and is formed by connecting lower ends of a pair of projecting portions projecting vertically downward from a pair of side wall portions. It is an inclined surface that rises from the right side in the figure toward the upper left side. The second guide portion 11 is located at an upper portion of the end of the main body frame 9 facing the peripheral portion of the swivel table, is formed by connecting upper edges of a pair of side wall portions, and rises from the right side to the upper left side in the drawing. It has an inclined surface. A pin hole 12 is formed in the second guide portion 11.

13 is a drive cylinder. The drive cylinder 13 is disposed inside the main body frame 9 along the axial direction, and a piston rod 14 protrudes from the left end face, and the right end face is vertically connected to a pair of side walls of the main body frame 9 by the pivot 15. It is pivotably supported.

Reference numeral 16 denotes a cylinder restraining member, which is arranged inside the main body frame 9 below the drive cylinder 13. The cylinder restraining member 16 is made of a pair of elongated plate members disposed to face each other along the axial direction of the main body frame 9, and the right end thereof can pivot vertically on the pair of side wall portions of the main body frame 9 by the pivot 17. A long hole 18 is formed at the left end along the axial direction. A pivot 19 attached to the piston rod 14 of the drive cylinder 13 is movably inserted into the elongated hole 18 of the cylinder restraining member 16 along the axial direction of the elongated hole.
The cylinder restraining member 16 is provided on the side wall of the main body frame 9.
A stopper 9a for regulating the upper limit position is formed.

Reference numeral 20 denotes a counterweight engaging link,
It is located at the left end inside. The counterweight engaging link 20 is made of a pair of elongated plates vertically arranged inside the left end of the cylinder restraining member 16, and the intermediate portion is supported by a pivot 19 inserted through the long hole 18 of the cylinder restraining member 16. A counterweight engaging pin is provided at the lower end located below the cylinder restraining member 16 so as to be swingable, and engages with an engaging portion of the counterweight 8 in a detachable manner.
21 is attached. Reference numeral 22 denotes a connecting link, which is arranged at the left end inside the main body frame 9. Link 22
Is composed of a pair of elongated plates disposed above the left end of the cylinder restraining member 16. The left end of the main body frame 9 is also pivotally supported by a pair of side walls by a pivot 23, and the right end is counterweight engaged by a pivot 24. It is connected to the upper end of the link 20.

The counterweight 8 has an L-shape corresponding to the lower corner of the rear part of the swivel 2 and a box shape with an open surface corresponding to the lower corner of the rear of the swivel 2, and constitutes each side surface and bottom surface. It has a predetermined weight due to the metal wall.
The counterweight 8 has a first guide portion 25 as a guide member.
And a second guide portion 26 are provided, and the first guide portion 25
Is formed at the left end portion of the counterweight 8 so as to have the same inclination in the same direction as the first guide portion 10 of the main body frame 9, and sandwiches the first guide portion 10 so as to be able to be inserted and removed. Has made. The second guide portion 26 is provided on the upper portion of the counterweight 8 with the second guide portion 11 of the main body frame 9.
It is formed with the same direction of inclination corresponding to
The configuration is such that it can be placed on the upper surface of the second guide portion 11. The second guide portion 26 has a pin hole in the second guide portion 11.
A pin holding portion 27 is formed corresponding to 12. Further, the second guide portion 26 is provided with the second guide portion 11 of the main body frame 9.
A roller 28 is provided on the upper surface of the roller for rotational contact, and
A pin hole 30 for holding a lock pin 29 to be inserted into the pin hole 12 is formed at the bottom. Lock pin 29 with pin hole
The counterweight 8 is fixed to the vehicle body 1 by passing the tip of the pin 29 into a part of the vehicle body 1. Further, on the upper left end of the side wall portion of the counterweight 8, an engagement portion with which the engagement pin 21 of the counterweight engagement link 20 is removably engaged.
31 are formed. The center of gravity of the counterweight 8 is set at the lower rear portion as shown by G in the figure.

The operation of the thus configured counterweight attaching / detaching apparatus will be described with reference to FIGS.

FIG. 1 shows a case where the counterweight 8 is removed from the swivel base 2 and placed at a predetermined position on the vehicle body 1. From this state, the counterweight 8 is attached to the lower part of the rear part of the swivel 2. That is, when the counterweight 8 is removed, the piston rod 14 of the drive cylinder 13 is at the most retracted position, and the pin 19 attached to the piston rod 14 is located on the rightmost side of the long hole 18 of the cylinder restraining member 16. It collides with the end (the end corresponding to the position where the piston rod 14 is most retracted) and stops. As a result, the cylinder restraining member 16 is lifted by the piston rod 14 and swings up to the inside of the main body frame 9 around the pivot 17, and at the same time, the drive cylinder 13 also swings upward around the pivot 15 to move the main body frame 9 Get inside. And the cylinder restraining member
Reference numeral 16 restricts the drive cylinder 13 to a position stored inside the main body frame 9. At this time, the counterweight engaging link 20 is connected to the pivot 19 of the piston rod 14 of the drive cylinder 13.
Has been raised.

Next, as shown in FIG. 2, the counterweight attaching / detaching device provided on the swivel base 2 starts the operation of attaching the counterweight 8 to the lower corner of the rear part of the swivel base 2. That is,
When the piston rod 14 of the drive cylinder 13 is protruded forward to some extent from the most retracted position, the pin 19 attached to the piston rod 14 moves forward from the rightmost end of the long hole 18 of the cylinder restraining member 16 to the left. Therefore, the restraint of the drive cylinder 13 by the cylinder restraining member 16 is released. Therefore, the drive cylinder 13 is centered on the pivot 15 and the cylinder restraining member 16 is
Swing from the inside to the lower side, and at the same time, the counterweight engagement link 20 is
Decreased by 19. At this time, the counterweight engaging link 20 is connected to the pin 19 by the connecting link 22 connected to the upper end.
Is pivoted clockwise as shown in the figure, and the engaging pin 21 attached to the lower end of the counterweight engaging link 20 is
Is engaged with the engaging portion 31 of the counterweight 8 placed on the second member.

Next, as shown in FIGS. 3 and 4, the counterweight attaching / detaching device attaches the counterweight 9 to the lower corner of the rear portion of the swivel 2. That is, when the piston rod 14 of the drive cylinder 13 is further advanced from the state shown in FIG. 2, the pin 19 attached to the piston rod 14 moves forward along the elongated hole 18 of the cylinder restraining member 16. Therefore, the counterweight engaging link 20 supported by the pin 19 is linearly moved leftward. Then, the counterweight 8 moves on the vehicle body 1 toward the left side in the figure. Then, the first guide portion 25 provided on the counterweight 8 is combined with the first guide portion 10 provided on the main body frame 9, and the lower surface of the second guide portion 26 provided on the counterweight 8 is attached to the main body frame 9. It comes into contact with the upper surface of the second guide 11 provided.
Then, when the piston rod 14 of the drive cylinder 13 further projects forward and the counterweight 8 further moves to the left due to the movement of the counterweight engagement link 20,
The first guide portion 25 of the counter weight 8 is
Is guided along the inclination of the guide portion toward the upper body frame 9, and the second guide portion 26 of the counterweight 8 is also connected to the second guide portion of the body frame 9. 11
It slides on the upper side and is guided toward the upper body frame 9 along the inclination of the guide portion. As a result, the counter weight 8
The whole moves toward the upper left side and is drawn to the main body frame 9. Before the second guide portion 26 of the counterweight 8 slides on the second guide portion 11 of the main body frame 9, the roller 28 provided on the counterweight 8 rotates on the second guide portion 11. And move by the second guide
26 makes it easy to move. In addition, counter weight 8
When the roller 28 is placed on the second guide portion 11, the left portion of the counterweight 8 tends to float naturally without using the first guide portion, but the guide portion 25 sandwiches the guide portion 10. The shape prevents the occurrence of this phenomenon. That is, in the type in which the guide portion 25 only slides on the upper surface of the guide portion 10, the left side portion of the counterweight 8 in the drawing rises and the tip of the guide portion 25 interferes with the lower surface of the turntable.

Finally, with the counterweight 8 securely attached to the lower corner of the rear portion of the swivel 2, the lock pin 29 stored in the pin hole 30 of the counterweight 8 is moved to the second guide 26 of the counterweight 8. The counterweight 8 is fixed to the swivel 2 from the pin holding portion 27 through the pin hole 12 of the second guide portion 11 of the main body frame 9.

When the counterweight 8 attached to the swivel 2 is removed, the operation reverse to the operation described above is performed.

In this embodiment, in addition to the drive cylinder 13 and the guide member, the cylinder restraining member 16 and the counterweight engaging link 20 are combined, so that the drive cylinder 13 projects outward from the main body frame 9 and The operation of moving the weight 8 horizontally and vertically can be automatically performed continuously.

Also, since the linear motion of the piston rod 14 of the drive cylinder 13 is converted into the oscillating motion of the counterweight engaging link 20 and the counterweight 8 is moved horizontally, the linear motion of the piston rod 14 of the drive cylinder 13 is compared with the linear motion of the piston rod 14 of the drive cylinder 13. Therefore, the horizontal movement amount of the counterweight 8 is large. For this reason, the linear movement amount of the piston rod 14 of the drive cylinder 13 can be made smaller than the horizontal movement amount of the counterweight 8, so that the size of the counterweight attachment / detachment device can be reduced, the space for mounting the counterweight can be enlarged, and furthermore, when the counterweight is mounted Since there is no danger of buffering with the counterweight due to the rotation of the swivel 2, the inside of the counterweight 8 (the swivel side) and the rear portion of the swivel 2 do not need to be largely scraped off. Space can be secured.

The present invention is not limited to the above-described embodiment, and can be variously modified and implemented.

For example, FIG. 6 shows an example in which a cylinder restraining member 32 is used instead of the cylinder restraining member 16 described above.

FIG. 7 shows an example in which a plate member 33 having a long hole 34 is used in place of the counterweight engaging link 20 described above.

[Effects of the Invention] As described above, according to the present invention, a drive cylinder that drives a counterweight in a horizontal direction and a guide member that guides the counterweight moved by the drive cylinder while changing the direction in the vertical direction are provided. When mounting the counterweight on the turntable of the vehicle type crane, the drive cylinder guides the counterweight on the body of the vehicle type crane upward while guiding the counterweight toward the turntable while moving the counterweight. When the drive cylinder is removed from the swivel base, the drive cylinder moves the counter weight on the swivel base and guides it downward toward the vehicle body with the guide member, so it is only necessary to combine one set of drive cylinders and a guide member with a simple structure. The counterweight can be attached to and detached from the swivel table without installing two cylinders. Thus, it is possible to provide a counterweight attaching / detaching device for a vehicle-type crane which has a simple structure for moving the counterweight and is economical.

[Brief description of the drawings]

1 to 3 are side sectional views of a counterweight attaching / detaching device showing a process of attaching a counterweight, FIG. 4 is a plan sectional view of the counterweight attaching / detaching device, FIG. The figure shows a vehicle type crane, and FIGS. 6 and 7 are side sectional views of a counterweight attaching / detaching apparatus showing another embodiment. 1 ... body, 2 ... turntable, 8 ... counterweight,
9 ... body frame, 10, 11 ... guide part (guide member), 1
3… Drive cylinder, 16… Cylinder restraint member, 20 ……
Counterweight engagement link, 25, 26 ... guide part (guide member), 31 ... engagement part.

Claims (1)

(57) [Claims] 1. A device for attaching and detaching a counterweight to and from a swivel provided on a vehicle body of a vehicle type crane, wherein a piston rod having one end pivotally supported by the swivel and projecting from the other end can be engaged with and disengaged from the counterweight. A drive cylinder for moving the counterweight by advancing or retreating the piston rod while being locked to the piston rod; and a counterweight for moving the counterweight on the vehicle body by advancing or retreating the piston rod. Guide upward and move to the swivel table, and guide the counterweight downward when moving the counterweight on the swivel table by forward or backward movement of the piston rod. And a guide member for moving the vehicle on the vehicle body. Counterweight attaching and detaching apparatus of the type crane.