Hoist type crane

Abstract

To provide a hoist type crane that is able to synchronize hoisting and lowering operations of two air hoists with an inexpensive device configuration.SOLUTION: A hoist type crane 1 includes: two air hoists 3, 4 configured to perform hoisting and lowering with air supply; an air circuit 6 configured to perform the air supply for hoisting and lowering to each of the two air hoists 3, 4; a changeover switch 2 configured to switch air supply by the air circuit 6 so that at least one of the air hoists 3, 4 is allowed to perform hoisting or lowering; and a controller 5 configured to select hoisting or lowering for the air hoists 3, 4 selected by the changeover switch 2 and control the air circuit 6 so that the selected operation for hoisting or lowering is performed.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a hoist crane.

Background Art

[0002] Conventionally, as this type of technology, a hoist crane has been proposed that is equipped with two hoists, separately connects load detection devices to both hoists, and connects the motors and load detection devices of both hoists to a control unit. The hoist crane further includes a controller that can select and operate either one of the two hoists independently and can operate both hoists simultaneously. According to this hoist crane, by electrically controlling the motors connected to the two hoists using the controller, the hoisting and lowering of each hoist are controlled (Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, when using electric hoists driven by electricity, if an attempt is made to synchronize the hoisting and lowering operations selectively for two electric hoists, the device configuration becomes expensive.

[0005] The present invention has been made in view of such problems, and an object thereof is to provide a hoist crane capable of synchronizing the hoisting and lowering operations of two air hoists with an inexpensive device configuration.

Means for Solving the Problems

[0006] In view of the above problems, the hoist crane according to the present invention includes two air hoists that perform lifting and lowering by supplying air, an air circuit that supplies the air for lifting and lowering to each of the two air hoists, a switching switch that switches the supply of the air by the air circuit so that at least one of the air hoists can perform lifting or lowering, and a controller that controls the air circuit so that either lifting or lowering is selected for the air hoist selected by the switching switch and the selected lifting or lowering operation is executed.

Effect of the Invention

[0007] According to the present invention, when driving at least one or both of the two air hoists, the switching switch is used to select and switch the supply of air to the air hoist to be driven. In this state, the controller selects either lifting or lowering for the air hoist selected by the switching switch, and the selected lifting or lowering operation is executed. Thereby, the lifting and lowering operations of the two air hoists can be synchronized with an inexpensive device configuration.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3A

Figure 3B

Figure 3C

Figure 4A

Figure 4B

Figure 4C

Figure 4D

Embodiments for Carrying out the Invention

[0009] Hereinafter, the hoist-type crane 1 according to the embodiment of the present invention will be described in detail with reference to the drawings.

[0010] As shown in Figs. 1 and 2, the hoist-type crane 1 includes two air hoists 3 and 4 that perform lifting and lowering by air supply. Specifically, each of the air hoists (Hoist A and B) 3 and 4 has an air motor (not shown), and by driving the air motor, a winding drum (not shown) around which a wire is wound is rotated in the lifting and lowering directions.

[0011] The air hoists (hoists A and B) 3 and 4 are slidably attached to the rail 19 via the connection frame 18. A sling 7 is attached to the air hoist (hoist A) 3 via a wire 12A, and a posture conversion hook 8 is attached to the air hoist (hoist B) 4 via a wire 12B. A limit stopper 11 is fixed to the wire 12B, and the limit stopper 11 abuts against an overwind prevention lever 10 provided on the air hoist 4, thereby restricting the winding up of the air hoist 4. As a result, the ascending position of the posture conversion hook 8 is restricted.

[0012] The hoist-type crane 1 further includes an air circuit 6, a changeover switch 2, and a controller 5. The air circuit 6 supplies air for winding up and winding down to each of the two air hoists 3 and 4. As shown in FIG. 2, the air circuit 6 includes a winding-up circuit 6A and a winding-down circuit 6B, and ON-OFF valves for independently supplying and blocking air to the air hoists 3 and 4 are provided in the respective circuits 6A and 6B.

[0013] As shown in FIGS. 2 and 3A to 3C, the changeover switch 2 switches the supply of air by the air circuit 6 so that at least one of the air hoists 3 and 4 can be wound up or down. As a result, either one or both of the two air hoists 3 and 4 can be selected and operated.

[0014] The controller 5 controls the air circuit 6 so as to select either winding up or winding down for the air hoists 3 and 4 selected by the changeover switch 2, and execute the selected winding-up or winding-down operation.

[0015] In this way, for example, when only the air hoist 3 (hoist A) is operated, as shown in FIGS. 3A(a) and (b), the changeover switch 2 is switched to A drive. When the air hoist 3 is used to perform a hoisting operation, as shown in FIG. 3A(a), the controller (hoist pendant) 5 selects upward movement, and air is supplied to the valve A of the hoisting circuit 6A of the air circuit 6. When the air hoist 3 is used to perform a lowering operation, as shown in FIG. 3A(b), the controller (hoist pendant) 5 selects downward movement, and air is supplied to the valve A of the lowering circuit 6B of the air circuit 6.

[0016] On the other hand, when only the air hoist 4 (hoist B) is operated, as shown in FIGS. 3B(a) and (b), the changeover switch 2 is switched to B drive. When the air hoist 4 is used to perform a hoisting operation, as shown in FIG. 3B(a), the controller (hoist pendant) 5 selects upward movement, and air is supplied to the valve B of the hoisting circuit 6B of the air circuit 6. When the air hoist 3 is used to perform a lowering operation, as shown in FIG. 3B(b), the controller (hoist pendant) 5 selects downward movement, and air is supplied to the valve B of the lowering circuit 6B of the air circuit 6.

[0017] Furthermore, when both the air hoists 3 and 4 (hoists A and B) are operated, as shown in FIGS. 3C(a) and (b), the changeover switch 2 is switched to both drives. When the air hoist 3 is used to perform a hoisting operation, as shown in FIG. 3C(a), the controller (hoist pendant) 5 selects upward movement, and air is supplied to the valves A and B of the hoisting circuit 6A of the air circuit 6. When the air hoists 3 and 4 are used to perform a lowering operation, as shown in FIG. 3C(b), the controller (hoist pendant) 5 selects downward movement, and air is supplied to the valves A and B of the lowering circuit 6B of the air circuit 6.

[0018] In this way, the independent hoisting and lowering operations of the air hoists 3 and 4 (hoists A and B) can be executed, and the hoisting and lowering operations with them synchronized can also be executed.

[0019] The conveyance of the suspension member (suspension) 12 using the hoist type crane 1 will be described below with reference to FIGS. 4A to 4D. First, as shown in FIG. 4A, the changeover switch 2 is switched to A drive, the air hoist 3 (hoist A) is operated by the controller 5, the spreader 7 is moved, hooked on one side of the suspension 12, and removed from the press-fitting machine 13.

[0020] Next, as shown in FIG. 4B, the changeover switch 2 is switched to B drive, the air hoist 4 (hoist B) is operated by the controller 5, the attitude conversion hook 8 is lowered, and hooked on the other side of the suspension 12.

[0021] Next, as shown in FIG. 4C, the state where the changeover switch 2 is switched to B drive is maintained, the air hoist 4 (hoist B) is operated by the controller 5, the attitude conversion hook 8 is hoisted, and the attitude of the suspension 12 is made horizontal. In this attitude, since the limit stopper 11 abuts on the overwind prevention lever 10 of the air hoist 4 (hoist B), excessive hoisting can be automatically stopped by the mechanical structure. As a result, the attitude of the suspension 12 can be held horizontally.

[0022] Next, as shown in FIG. 4D, the changeover switch 2 is switched to both drive, the air hoists 3 and 4 (hoists A and B) are operated by the controller 5, and the spreader 7 and the attitude conversion hook 8 are lowered while being synchronized. Thereby, while maintaining the attitude of the suspension 12 horizontally, the suspension can be lowered and installed on the carriage 14.

[0023] When driving at least one or both of the two air hoists 3 and 4, the changeover switch 2 is used to select and switch the supply of air to the air hoists 3 and 4 to be driven. In this state, the controller 5 selects either winding up or winding down for the air hoists 3 and 4 selected by the changeover switch 2, and the selected winding-up or winding-down operation is executed. Thereby, the winding-up and winding-down operations of the two air hoists 3 and 4 can be synchronized with an inexpensive device configuration.

[0024] As described above in detail with respect to the embodiments of the present invention, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention described in the claims. The present invention can add the configuration of one embodiment to the configuration of another embodiment, replace the configuration of one embodiment with that of another embodiment, or delete a part of the configuration of one embodiment.

Explanation of Signs

[0025] 1: Hoist-type crane, 2: Changeover switch, 3, 4: Air hoist, 5: Controller, 6: Air circuit

Claims

【Claim 1】 Two air hoists that perform hoisting and lowering by supplying air, For each of the two air hoists, an air circuit that supplies the air for hoisting and lowering, A changeover switch that switches the supply of the air by the air circuit so that at least one of the air hoists can perform hoisting or lowering, A controller that controls the air circuit so as to select either hoisting or lowering for the air hoist selected by the changeover switch and execute the selected hoisting or lowering operation, Comprising: The air circuit is: For each of the two air hoists, a hoisting air circuit that performs hoisting by supplying the air, For each of the two air hoists, a lowering air circuit that performs lowering by supplying the air, Comprising, In the hoisting air circuit and the lowering air circuit, an ON-OFF valve that independently supplies and shuts off the air is provided for each of the two air hoists, and the hoist-type crane is characterized by this.

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