JPH07268898A - Hydraulic grab bucket - Google Patents

Abstract

PURPOSE:To obtain a hydraulic grab bucket, in which the degree of the opening of a bucket shell can be determined accurately at a separate place by mounting an opening indicator composed of an opening detecting means disposed near the shaft of the bucket shell and a display means. CONSTITUTION:When a signal operating a bucket shell 50 from the state of full opening to the closing direction is emitted from an operator chamber, a port P is bonded with a port B in a changeover control valve 48, and the rear section side of the cylinder body 81 of a hydraulic cylinder 80 is supplied with a pressure working fluid through an extension-side duct 70. The working fluid is removed from the front section side across a piston 82 and passed through a reservoir return duct 72 through a port T from a port A through a contracting and retreating side duct 71 and flows back to a reservoir 41. The number of pulses generated from an electric signal generator 62 is proportional to the movement of a piston rod 83, the degree of opening and closing of a bucket shell 50, at that time, and the relationship is arithmetically operated by an arithmetic unit 63, and displayed by an indicator 64, thus determining the degree of opening and closing of a bucket by the operator chamber.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a center frame suspended by wires, a pair of bucket shells rotatably supported by the center frame, a hydraulic cylinder for opening and closing the bucket shell, and a hydraulic cylinder. The present invention relates to a hydraulic grab bucket including a hydraulic device that supplies pressurized oil to a cylinder.

[0002]

2. Description of the Related Art Conventionally, this type of hydraulic grab bucket has been
A hydraulic cylinder that opens and closes the bucket shell is provided over the upper part of the bucket shell, while a hydraulic device that generates hydraulic pressure and controls the operation of the hydraulic cylinder is installed in a control room on board or above the ground, and a long hydraulic hose. Was installed along the slane boom and connected to the hydraulic cylinder. On the other hand, the bucket shell is a place that is far away and hard to see, especially for sinking deep into the water for dredging work, etc., and the degree of opening and closing cannot be visually confirmed,
It depended on the experience and intuition of the operator.

[0003]

However, in such a conventional hydraulic grab bucket, the bucket shell must be operated in a place where the operator's eyes are hard to reach, such as underwater, by operating the degree of opening and closing depending on experience and intuition. It is mistaken for a fully closed state to bite rocks etc. into the claws at the tip of the bucket shell, or to carry out confirmation oil transmission more than necessary to confirm full opening and closing, resulting in a delay in work efficiency and energy consumption. There was a problem such as waste of money. Further, there is a problem that the operating cost increases due to the loss of hydraulic pressure, and there has been a strong demand for solving these problems.

In view of such a conventional hydraulic grab bucket, an object of the present invention is to provide a hydraulic grab bucket which can accurately know the opening / closing degree of a bucket shell located at a remote position such as underwater in an operation room. With the goal.

[0005]

In order to achieve the above object, the gist of the present invention is that a center frame suspended by a wire or the like and a horizontal shaft is rotatably supported on the center frame with a horizontal shaft. In a hydraulic grab bucket including a pair of bucket shells driven together with a hydraulic cylinder, an opening detection means arranged near the rotation axis of the bucket shell, and a display means for displaying the detection result of the opening detection means. An opening degree indicating device constituted by and is provided. Further, the opening degree detecting means receives an electric signal transmitter provided in a part of the bucket shell and the center frame and an electric signal from the electric signal transmitter and converts the electric signal into the opening / closing degree of the bucket shell. It is composed of a calculation means.

Further, the electric signal transmitter is a pulse signal composed of a plurality of magnets arranged concentrically with the rotating shaft of the bucket shell on the center frame side at equal intervals and a coil fixed on the bucket shell side. It may be a transmitter. The electric signal transmitter may be a strain signal transmitter that takes out the opening of the bucket shell as a change in magnetism.

[0007]

The hydraulic grab bucket according to the present invention receives an electric signal transmitter arranged in a hydraulic cylinder and an electric signal from the electric signal transmitter, and receives the electric signal from the electric signal transmitter to perform calculation in an operator room on the ground or on a ship. The bucket shell closing direction and the opening are calculated on the display unit and displayed on the display unit.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. 1 is an overall front view of a hydraulic grab bucket according to an embodiment of the present invention, FIG. 2 is a partially cutaway front view showing a center frame of a hydraulic grab bucket according to an embodiment of the present invention, and FIG. It is a partially notched side view of the center frame.

As shown in FIG. 1, the hydraulic grab bucket G is suspended by a suspending metal fitting 1 which suspends the bucket body 10 by being knotted by a wire from a crane boom. Further, the center frame 20 that has a watertight closed chamber 30 inside the bucket body 10 and stores the hydraulic device 40 therein.
And a pair of bucket shells 50 pivotally supported by the center frame 20 so as to be openable and closable, and a hydraulic cylinder 80 that is attached across the tops of the bucket shells 50 to open and close the bucket shells 50. An opening degree indicating device for detecting and displaying the degree of closure of the bucket shell is provided in the operation room or the like.

As shown in FIGS. 2 and 3, the center frame 20 is made of a strong steel structure, is provided with a mounting bracket 21 for the wire 9 on the upper side, and has a bucket shell 50 at the four corners of the hem. A shell mount 23 is provided with a pivot 22 for pivotal attachment. A watertight closed chamber 30 for housing the hydraulic device 40 is formed in the center of the frame.

The watertight closed chamber 30 has a welded structure on the four circumferences and the bottom, and is appropriately reinforced on the outside so as to withstand high water pressure, but only the upper part is opened for periodic inspection. It can be opened, and the upper lid 31 is provided with a watertight means by a packing 32. Further, the lower half of the watertight closed chamber 30 constitutes the reservoir 41 of the hydraulic device 40 as it is, and the reservoir 41 and the upper space are sealed and partitioned by the upper reservoir plate 42 and the reservoir packing 43.

As shown in FIG. 4, the bucket shell 50 comprises a pair of shell main bodies 51 made of steel, and a scooping portion 52 made of cast steel for scooping earth and sand, and hydraulic cylinders are provided at both upper ends of the shell main body 51. Pin 53 for connecting 80
Is provided with a cylinder coupling portion 54.
Below the cylinder coupling portion 54, a bearing portion 55 that receives the pivot 22 of the center frame 20 is provided.

Further, the shell body 51 includes both shell body 5
An equalizer 56 is provided so that the opening and closing degrees of 1 are the same angle on the left and right. Further, a plurality of claws 57 for scraping off the earth and sand are attached to the tip of each scooping portion 52 alternately in the left and right. A coil 87 corresponding to a magnet 86, which will be described later, is fixed to a shoulder portion of the shell body 51 that is rotated by the hydraulic cylinder 80 around the bearing portion 55.

Next, the hydraulic device 40 and the opening / closing display device 60 for detecting and displaying the opening / closing degree of the bucket will be described with reference to FIG. In this figure, JIS hydraulic pressure symbols are used.
The hydraulic device 40 is an electric pump 45 which is connected to a motor 44 provided on an upper plate 42 of a reservoir 41 which is formed by a part of a watertightly closed chamber, and which sends pressure hydraulic oil,
The relief valve 46 for controlling the upper limit of the pressure and the check valve 4
7 and a switching control valve 48 for switching the hydraulic oil.

In the present embodiment, the electric pump 45 is of a piston type which produces high-pressure force. Further, the switching control valve 48 performs a switching operation by an electric signal. A supply line 49 is provided at the P port of the switching control valve 48, a reservoir return line 72 is provided at the T port, a compression side line 71 of the hydraulic cylinder 80 is provided at the A port, and an extension side line is provided at the B port. 70 are connected.

As shown in FIGS. 5 and 7, the opening degree indicating device 60 is an electric signal serving as a transmitting means for emitting an electric signal in proportion to the amount of rotation of the bucket shell 50 which rotates in proportion to the amount of movement of the piston rod 83. The transmitter 62 and the electric signal transmitter 6
2 includes an arithmetic unit 63 which is an arithmetic unit that receives an electric signal from the arithmetic unit 63 to perform an arithmetic operation, and transmits it as the opening degree of the bucket shell 50, and a display unit 64 which is an indicating unit that receives and displays the output from the arithmetic unit 63. ing.

The electric signal transmitter 62 comprises a plurality of magnets 86 arranged concentrically with the bearing 55 on the side of the center frame 20 and a coil 87 fixed to a part of the shell body 51 facing the magnets 86. Has been done. In the embodiment shown in FIG. 5, the magnet 86 is arranged in a fan shape at positions 0 to 8. At the position shown in No. 8, the bucket shell 50 is fully closed, and at the position shown in No. 0, it is fully opened. FIG. 6 shows the magnet 86.
9 is a cross-sectional view showing the relationship between the coil and the coil 87. The bucket shell 50 is rotated by the hydraulic cylinder 80 and successively passes through the magnet 86, and a pulse is generated in the coil 87 each time it passes.

Of the above, the electric signal transmitter 62 is provided in the center frame 20 and the bucket shell 50 of the hydraulic grab bucket G, and the arithmetic unit 63 and the display 64 are other control transmitters in the operator room such as on board. It is provided together with a container and the like, and both are connected by a signal cable 65.

The arithmetic unit 63 receives the signal from the electric signal transmitter 62, sends the signal to the arithmetic unit 63b, and outputs the result from the arithmetic unit to the display unit 64, and the input / output unit 63a. Signal from the bucket shell 50
And a calculation unit 63b for converting the open / closed degree. Further, the display 64 can be displayed by analog display, digital display, simulated graphic display, or the like. Hydraulic cylinder 8
Reference numeral 0 denotes a cylinder tubular body 81, a piston 82, and a piston rod 83, and a bearing 8 fitted to the pin 53 of the bucket shell 50 at the tail portion of the cylinder tubular body 81.
4a is provided, and the other end of the piston rod 83 has a pin 5 of the bucket shell 50.
A coupling member 85 having a bearing 85b that is coupled to the No. 3 is attached.

Next, the operation of the hydraulic grab bucket will be described. Now the hydraulic cylinder 80 is in the fully retracted position,
It is assumed that the bucket shell 50 is in the fully open state. When a signal is issued from the operator room to actuate the bucket shell 50 in the closing direction by an electric means, the switching control valve 48 is brought into the third position, that is, the operating state of the rightmost frame in FIG. 7, and the P port is changed to the B port. The combined hydraulic pressure oil is supplied to the rear side of the cylinder body 81 of the hydraulic cylinder 80 via the extension side pipe line 70, the hydraulic oil is removed from the front side side of the piston 82, and the compression side hydraulic line 71 is supplied. It flows through the reservoir return pipe 72 from the A port to the T port and then flows back to the reservoir 41.

At this time, the number of pulses generated from the electric signal transmitter 62 is proportional to the moving amount of the piston rod 83, and the moving amount of the piston rod 83 is the bucket shell 5.
It is proportional to the opening / closing degree of 0. Therefore, if the above relationship is calculated by the calculation device 63 and displayed on the display 64,
The operator can know the degree of opening and closing of the bucket that is operating by sinking deeply into the water while operating in the operator room far away.

In the operation from the fully closed state to the opening direction, the switching control valve 48 becomes the leftmost function, and P, A and B
And the T port are connected to each other, the pressure hydraulic oil is sent to the piston rod 83 side of the hydraulic cylinder 80 through the compression side pipe line 71, and the rear side hydraulic oil passes through the extension side pipe line 70 from the B port to the T port. Through the port and through the reservoir return line 72,
Reflux to the reservoir 41.

Since the moving direction of the piston rod 83 is opposite to that of the previous time and the electromotive force generated is also of opposite polarity, it can be identified and calculated by the calculating unit 63b and displayed.

The electric signal transmitter of the above embodiment is not limited to the one which generates the pulse signal by the magnet and the coil, but other electric position detecting means such as one utilizing magnetostriction may be used. . In any case, various modifications can be made without departing from the gist of the present invention.

[0025]

As described above, the hydraulic grab bucket of the present invention is rotatably supported by a center frame suspended by a wire and a horizontal shaft, and driven by a hydraulic cylinder. In a hydraulic grab bucket consisting of a pair of bucket shells,
An opening degree indicating device including an opening degree detecting means arranged near the rotating shaft of the bucket shell and a display means for displaying a detection result of the opening degree detecting means is provided, and the opening degree detecting means is Since it is composed of an electric signal transmitter arranged in a part of the bucket shell and the center frame, and an arithmetic means for receiving the electric signal from the electric signal transmitter and converting it into the opening / closing degree of the bucket shell, It is possible to work while monitoring the degree of opening and closing of the bucket shell at a remote location such as underwater, which improves workability. Therefore, hydraulic energy is saved and operating costs can be significantly reduced.

Further, the electric signal transmitter is a pulse signal composed of a plurality of magnets arranged on the center frame side in a concentric pattern with the rotating shaft of the bucket shell at equal intervals, and a coil fixed on the bucket shell side. When configured with a transmitter, the opening of the bucket shell can be displayed more accurately. Further, even when the electric signal transmitter is a strain signal transmitter that extracts the opening of the bucket shell as a change in magnetism, the opening of the bucket shell can be displayed more accurately.

[Brief description of drawings]

FIG. 1 is an overall front view of a hydraulic grab bucket according to an embodiment of the present invention.

FIG. 2 is a partially cutaway front view showing a center frame of a hydraulic grab bucket according to an embodiment of the present invention.

FIG. 3 is a partially cutaway side view of the center frame.

FIG. 4 is a partially cutaway front view showing the bucket shell.

FIG. 5 is an explanatory diagram of an electric signal transmitting mechanism of the hydraulic grab bucket.

FIG. 6 is a side sectional view of an electric signal transmitting mechanism of the hydraulic grab bucket.

FIG. 7 is an explanatory diagram showing a correlation among a hydraulic device used in the present invention, a hydraulic cylinder, and an opening degree indicating device.

[Explanation of symbols]

 A Hydraulic Grab Bucket 1 Suspension Bracket 9 Wire 10 Bucket Main Body 20 Center Frame 21 Mounting Bracket 22 Axis 23 Shell Mounting Part 30 Watertight Closed Room 31 Upper Lid 32 Packing 40 Hydraulic System 41 Reservoir 42 Upper Plate 43 Reservoir Packing 44 Motor 45 Electric Pump 46 Relief Valve 47 Check valve 48 Switching control valve 49 Supply line 50 Bucket shell 51 Shell body 52 Scooping part 53 Pin 54 Cylinder coupling part 55 Bearing part 56 Equalizer 57 Claw 60 Opening indicator 62 Electric signal transmitter 63 Computing device 63a Input / output Part 63b Calculation part 64 Indicator 65 Signal cable 70 Extension side conduit 71 Retraction side conduit 72 Reservoir return conduit 80 Hydraulic cylinder 81 Cylinder cylinder 82 Piston 83 Piston rod 84 Clevis 84a Bearing 86 Magnet 87 Coil

Claims (4)

[Claims] 1. A hydraulic grab bucket comprising a center frame suspended by a wire or the like, and a pair of bucket shells which are rotatably supported by a horizontal shaft on the center frame and driven by a hydraulic cylinder.
A hydraulic glove characterized by being provided with an opening degree indicating device including an opening degree detecting means arranged in the vicinity of a rotation axis of the bucket shell and a display means for displaying a detection result of the opening degree detecting means. bucket. 2. The opening degree detecting means receives an electric signal from an electric signal transmitter arranged in a part of the bucket shell and the center frame, and receives the electric signal from the electric signal transmitter to open and close the bucket shell. 2. The hydraulic grab bucket according to claim 1, further comprising a calculating means for converting into. 3. The electric signal transmitter comprises a plurality of magnets arranged on the center frame side at equal intervals concentrically with the rotating shaft of the bucket shell and a pulse signal fixed on the bucket shell side. The hydraulic grab bucket according to claim 2, which is a transmitter. 4. The hydraulic grab bucket according to claim 2, wherein the electric signal transmitter is a strain signal transmitter that extracts the opening of the bucket shell as a change in magnetism.