JP5340844B2 - Jib crane brake device - Google Patents

Description

  The present invention relates to a brake device for a jib crane.

  FIG. 2 is a side view showing an example of a jib crane. In FIG. 2, 1 is a traveling body provided with an endless crawler 2, 3 is a revolving body installed on the upper part of the traveling body 1, and 4 is a swiveling body. A jib 5 pivotally attached to the front portion of the swivel body 3 is an A frame.

  The A frame 5 has a vertical frame 5a that is vertically supported with its lower end supported on the rear side of the revolving unit 3, and a lower end that is supported on the front side of the revolving unit 3 and obliquely upward toward the upper end side of the vertical frame 5a. And an inclined frame 5b whose upper end is connected to the upper end of the vertical frame 5a.

  In FIG. 2, 6 is a sheave block provided at the upper end of the A frame 5, 7 is a sheave block connected to a jib support cable 8 having a tip connected to the upper end of the jib 4, and 9 is a revolving unit 3. The arranged jib hoisting winch 10 is wound and unwound by the jib hoisting winch 9, and is a wire rope for hoisting the jib 4 wound between the sheave blocks 6, 7. A load winch 12 is wound and unwound by the load winch 11 and is hung on the sheave blocks 13, 14, and 15, and a load wire rope 16 is wound around the load wire rope 12. It is a hanging hook that is provided integrally with the sheave block 15 and is suspended from the tip of the jib 4, and the winding wire rope 10 is wound and fed by the jib hoisting winch 9. Thus while raising and lowering the jib 4, and is adapted to lift a load hook 16 hanging by performing winding-unwinding of the suspended load wire rope 12 by the load winch 11 the hanging.

  And as one of the pile construction methods used for foundation construction etc., there is what is called an all casing construction method, and this all casing construction method is a steel pipe using an all-round rotation drive device A in the ground G as shown in FIG. A casing C made of When underground excavation and earth removal work is performed and a predetermined depth is reached by underground excavation and earth removal work using the hammer grab H, a rebar cage (not shown) is inserted into the casing C, and a tremy pipe ( This is a construction method in which the tremy tube and the casing C are pulled out and collected after the concrete is cast by (not shown).

  In addition, there exists patent document 1 as what shows the general technical level relevant to the apparatus used for the said all casing construction method, for example.

JP 2009-138394 A

  By the way, in the all casing method as described above, the operator lowers the hammer grab H suspended from the hanging load hook 16 into the casing C while operating the brake pedal of the brake device of the hanging load winch 11. However, since the hammer grab H in the casing C is not visible to the operator at all, it is not known how fast the hammer grab H is descending. The current situation is that the operation is performed while paying attention to the movement of the hanging wire rope 12 and the movement of the hanging winch 11 itself.

  However, the movement of the hanging wire rope 12 is difficult to see, and in order to see the movement of the hanging winch 11 itself, the operator needs to face backward. It was difficult to grasp the speed, and improvement was desired.

  In view of such circumstances, the present invention provides a brake device for a jib crane that can surely grasp the actual lowering speed even in a situation where the hanging load hook is not visible, and can smoothly perform the work accompanied by the operation of the brake pedal. It is something to try.

The present invention relates to a suspended load in which a jib is pivotably attached to a swivel body, and a hanging hook suspended from the tip of the jib is moved up and down by winding and unwinding a hanging wire rope. In a brake device for a jib crane configured to provide a winch for braking, and to brake and release the rotation of the suspension winch by operating a brake pedal,
A rotational speed detecting means for detecting a rotational speed of the suspended load winch;
The present invention relates to a brake device for a jib crane, comprising: vibration applying means for applying vibration to a brake pedal in accordance with the rotational speed of the hanging winch detected by the rotational speed detecting means.

  According to the above means, the following operation can be obtained.

  For example, in an all-casing method in which an operator operates a brake pedal of a lifting device for a suspended load winch to lower a hammer grab suspended from the suspended load hook into the casing, The hammer grab is not visible to the operator at all, but during this operation, the rotational speed detecting means detects the rotational speed of the suspended winch and vibrates according to the rotational speed of the suspended winch detected by the rotational speed detecting means. Vibration is applied to the brake pedal by the applying means, and the operator can grasp how fast the hammer grab is descending from the feel of the foot transmitted from the brake pedal. The brake pedal operation of the winch brake device It is possible to carry out without watching the movement and the suspended load winch itself movement.

In the brake device for the jib crane, the vibration applying means is
A controller that outputs an electrical signal corresponding to the rotational speed of the lifting winch detected by the rotational speed detection means;
When the rotational speed is slow, the electrical signal output from the controller and attached to the brake pedal is driven so that the number of push-pull rods is small and the number of push-pull rods is large when the rotational speed is fast. It can consist of a push-pull solenoid that strikes the brake pedal.

  According to the brake device of the jib crane of the present invention, it is possible to reliably grasp the actual descending speed even in a situation where the hanging load hook is not visible, and the excellent effect that the work accompanied by the operation of the brake pedal can be smoothly performed. Can play.

It is a general | schematic block diagram which shows the Example of this invention. It is a schematic diagram which shows excavation work using the all casing construction method by a jib crane.

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

  FIG. 1 shows an embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 2 denote the same components, and the basic configuration is the same as the conventional one shown in FIG. The feature of this embodiment is that, as shown in FIG. 1, the rotational speed detecting means 17 for detecting the rotational speed ω of the suspended load winch 11 and the suspended load winch detected by the rotational speed detecting means 17. 11 is provided with vibration applying means 20 that applies vibration to the brake pedal 19 of the brake device 18 of the hanging winch 11 in accordance with the rotational speed ω.

  In the case of this embodiment, the suspended load winch 11 is rotatably supported by a bearing 21 and a winch drum 22 around which the suspended wire rope 12 is wound is used as a rotary drive device such as a hydraulic motor or an electric motor. The brake device 18 of the hanging load winch 11 has a brake disk 25 attached to a required portion of the outer peripheral surface of the winch drum 22. A brake cylinder 26 capable of gripping and releasing the peripheral edge of the brake disc 25 is provided, and the pressure oil circulated by the hydraulic unit 27 with respect to the brake cylinder 26 is interlocked with the operation of the brake pedal 19. When the brake pedal 19 is depressed by the operator, it is circulated by the hydraulic unit 27. Pressure oil is supplied to the brake cylinder 26 via the brake valve 28, and the brake cylinder 25 grips the peripheral edge of the brake disc 25 to brake the hanging winch 11, while from the brake pedal 19. When the operator lifts his / her foot, the pressure oil supplied to the brake cylinder 26 is discharged to the tank side of the hydraulic unit 27 through the brake valve 28, and the brake cylinder 26 grips the peripheral edge of the brake disc 25. It has a configuration in which it is opened and the braking of the hanging load winch 11 is released.

  On the other hand, as the rotational speed detecting means 17, a proximity sensor 17A disposed opposite to the peripheral edge of the flange portion of the winch drum 22 is used, and the peripheral direction of the flange portion of the winch drum 22 is arranged in the circumferential direction. A convex portion (or a concave portion) (not shown) is formed at a required pitch, and when the winch drum 22 is rotated, the convex portion (or a portion where no concave portion is formed) is detected by the proximity sensor 17A. The rotational speed ω of the cargo winch 11 is detected. In this case, instead of forming convex portions (or concave portions) at the peripheral pitch of the flange portion of the winch drum 22 at a required pitch, teeth similar to the gears are engraved and the tooth portions are brought close to each other. By detecting with the sensor 17A, it is also possible to detect the rotational speed ω of the lifting winch 11. It is also possible to detect the rotational speed ω of the lifting winch 11 by attaching magnets at a required pitch in the circumferential direction of the flange portion of the winch drum 22 and detecting the magnetic field with a sensor. It is. As the rotation speed detecting means 17, a rotary encoder may be provided on the shaft portion of the winch drum 22 instead of the proximity sensor 17A.

  The vibration applying means 20 is attached to the controller 29 for outputting an electric signal E corresponding to the rotational speed ω of the hanging winch 11 detected by the rotational speed detecting means 17, the brake pedal 19 and the controller 29. When the rotational speed ω is slow, the electric signal E output from the controller 29 is driven so that the number of push-pull rods 30a is small and the number of push-pull rods 30a is large when the rotational speed ω is fast. And a push-pull solenoid 30 for hitting 19.

  Next, the operation of the above embodiment will be described.

  For example, in the all-casing method in which an operator operates the brake pedal 19 of the brake device 18 of the hanging load winch 11 to lower the hammer grab H suspended from the hanging load hook 16 into the casing C. Although the operator cannot see the hammer grab H in the casing C at all, the proximity sensor 17A as the rotational speed detecting means 17 detects the rotational speed ω of the hanging winch 11 during this operation, and the rotational speed detection is performed. An electric signal E corresponding to the rotational speed ω of the hanging winch 11 detected by the proximity sensor 17A as the means 17 is output from the controller 29 constituting the vibration applying means 20 to the push-pull solenoid 30, and the push-pull solenoid 30 When the rotational speed ω is slow, the push-pull rod 30a enters and exits While being driven to number less hit the brake pedal 19, the form of the time the rotational speed ω is high is driven so that a lot and out times of the push-pull rod 30a and hit the brake pedal 19.

  As a result, vibration is applied to the brake pedal 19 by the controller 29 and the push-pull solenoid 30 constituting the vibration applying means 20, and the operator feels at a speed at which the hammer grab H descends due to the foot feeling transmitted from the brake pedal 19. Therefore, the operator can operate the brake pedal 19 of the brake device 18 of the hanging winch 11 to move the hanging wire rope or the hanging winch 11 itself. This can be done without paying attention.

  In this way, even when the suspended load hook 16 is not visible, the actual descending speed can be reliably grasped, and the work involving the operation of the brake pedal 19 can be performed smoothly.

  The jib crane brake device of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 3 Revolving body 4 Jib 11 Hanging winch 12 Hanging wire rope 16 Hanging hook 17 Rotational speed detection means 17A Proximity sensor 18 Brake device 19 Brake pedal 20 Vibration imparting means 22 Winch drum 23 Rotation drive device 24 Reduction gear 25 Brake disc 26 Brake cylinder 27 Hydraulic unit 28 Brake valve 29 Controller 30 Push-pull solenoid 30a Push-pull rod C Casing E Electrical signal H Hammer grab ω Rotational speed

Claims (2)

A swinging winch is installed on the swivel body so that the jib can pivot up and down and the lifting hook is lifted and lowered by winding and unwinding the lifting wire rope. A brake device for a jib crane configured to brake and release the rotation of the suspension winch by operating a brake pedal,
A rotational speed detecting means for detecting a rotational speed of the suspended load winch;
A braking device for a jib crane, comprising: vibration applying means for applying vibration to the brake pedal in accordance with the rotational speed of the lifting winch detected by the rotational speed detecting means. The vibration applying means;
A controller that outputs an electrical signal corresponding to the rotational speed of the lifting winch detected by the rotational speed detection means;
When the rotational speed is slow, the electrical signal output from the controller and attached to the brake pedal is driven so that the number of push-pull rods is small and the number of push-pull rods is large when the rotational speed is fast. The brake device for a jib crane according to claim 1, comprising a push-pull solenoid for hitting a brake pedal.

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