WO2019004399A1

WO2019004399A1 - Grab bucket

Info

Publication number: WO2019004399A1
Application number: PCT/JP2018/024719
Authority: WO
Inventors: 牧男吉田; 忠男大須賀; 盛生駒井; 近藤　信一; 太 ▲高▼木
Original assignee: 東部重工業株式会社
Priority date: 2017-06-29
Filing date: 2018-06-28
Publication date: 2019-01-03
Also published as: JP2020152458A

Abstract

[Problem] To suppress deterioration caused by the use of a grab bucket. [Solution] This grab bucket is provided with a cylinder device 20, a first frame, a second frame, a pair of shells, and a connection body. The first frame is disposed on the upper end 91 side of the cylinder device 20. The second frame is affixed to the lower end side of the cylinder device 20. The pair of shells are individually supported on the second frame by shafts so that the pair of shells can pivot on a shaft perpendicular to the cylinder device 20. The connection body connects the shells and first frame on both sides of a support section. The cylinder device 20 has integrally formed therein an operating fluid holding space 31 formed by the outer surface 24 of a cylinder tube and a container wall 30.

Description

Grab bucket, cylinder device, and grab bucket parts assembly

The present invention relates to a grab bucket, a cylinder device, and a grab bucket assembly.

A grab bucket is known as an apparatus used for transferring loose materials such as wood chips, powdery ores, and earth and sand. The grab bucket is moved by a crane or the like. The shell of the grab bucket performs an opening / closing operation by operating a hydraulic valve or the like by transmitting a signal wirelessly, for example.

The grab bucket has, for example, a hydraulic cylinder. The shell is opened and closed by the movement of the piston of the hydraulic cylinder or the like. Oil, which is the working fluid of the hydraulic cylinder, is filled inside the cylinder. For operation of the cylinder, an external oil dam (tank) in communication with the inside of the cylinder is required.

Patent No. 3700161 gazette JP, 2010-285226, A

The cylinder device requires a flow path connecting both sides of the piston in addition to the through hole formed in the piston. This flow path was formed by a pressure resistant hose disposed outside the cylinder body. However, even with a pressure-resistant hose, a large change in pressure of the working fluid oil causes a large pressure fluctuation. For this reason, the pressure-resistant hose repeatedly deforms and deteriorates with use. In addition, in the mounting portion of the pressure-resistant hose, leakage or the like may occur due to repeated pressure fluctuation. Furthermore, if a pressure resistant hose is provided outside the cylinder, it may be damaged or deteriorated due to an impact due to contact with other devices or foreign matter.

Then, an object of the present invention is to control degradation accompanying use of a grab bucket.

In order to achieve the above-described object, the present invention provides a grab bucket, a cylinder tube extending from a first end to a second end and being filled with a working fluid, and closing an inner space of the cylinder tube to form a first space and a first space. The piston is movable in the axial direction of the cylinder tube into two spaces, and is formed with a through hole penetrating from the first end to the second end, and protrudes from the piston from the first end , A first closing block closing the first end of the cylinder tube, a second closing block closing the second end of the cylinder tube, and the first end side of the through hole A check plate for closing the flow of the working fluid toward the second end, a container wall forming a working fluid holding space between the outer surface of the cylinder tube, and a front A cylinder device comprising a working fluid circuit for causing the working fluid to flow between the working fluid holding space and the first space and between the working fluid holding space and the second space; A first frame disposed on the first end side, a second frame fixed to the second end side of the cylinder device, and the second frame rotatably pivotable about an axis perpendicular to the cylinder tube , And a connecting body for connecting the shell and the first frame on both sides with respect to the support portion.

Further, according to the present invention, in a cylinder device, a cylinder tube extending from a first end to a second end and filled with a working fluid, closing an inner space of the cylinder tube and dividing it into a first space and a second space A piston movable in the axial direction of the cylinder tube and having a through hole formed to penetrate from the first end to the second end, a rod extending from the piston and extending beyond the first end, and A first closing block for closing the first end of the cylinder tube, a second closing block for closing the second end of the cylinder tube, and a direction from the first end to the second end of the through hole A check plate for closing the flow of the working fluid, a container wall forming a working fluid holding space between the outer surface of the cylinder tube, the working fluid holding space, and A working fluid circuit for causing the working fluid to flow between the inner space of the cylinder tube on the first end side and between the working fluid holding space and the inner space of the cylinder tube on the second end side; It is characterized by having.

Further, according to the present invention, in the grab bucket part assembly, a container, a base housed inside the container, a carry-out mechanism for carrying the base out of the container, and a first end to a second end And a cylinder tube which is filled with the working fluid and which is closed in the inner space of the cylinder tube to be moved in the axial direction of the cylinder tube and which penetrates from the first end to the second end A piston, a rod extending from the piston and extending beyond the first end, a first closing block closing the first end of the cylinder, and a second closing the second end of the cylinder A closing block, a check plate for closing the flow of the working fluid from the first end to the second end of the through hole, and a volume forming a working fluid holding space The working fluid flows between a wall, the working fluid holding space and the inner space of the cylinder on the first end side, and between the working fluid holding space and the inner space of the cylinder on the second end side. A cylinder device fixed to the base, the first frame being fixed to the base and capable of being disposed on the first end side of the cylinder device; A second frame fixed to the base and fixed to the second end of the cylinder device; and the second frame fixed to the base and pivotable about an axis perpendicular to the cylinder A pair of shells that can be supported by the support on the frame respectively, and a connector fixed to the base and capable of connecting the shells to the first frame on both sides with respect to the support. Have And wherein the door.

ADVANTAGE OF THE INVENTION According to this invention, the deterioration accompanying use of a grab bucket can be suppressed.

1 is a side view of an embodiment of a grab bucket according to the present invention. It is a longitudinal section of a cylinder device used for one embodiment of a grab bucket concerning the present invention. It is a cross-sectional view of a cylinder apparatus used for one embodiment of a grab bucket concerning the present invention. It is a longitudinal cross-sectional view of the attachment part to the 2nd frame of the cylinder apparatus used for one embodiment of the grab bucket concerning the present invention. It is a hydraulic circuit figure of a cylinder device used for one embodiment of a grab bucket concerning the present invention. It is a hydraulic circuit diagram of the modification of the cylinder apparatus used for one embodiment of the grab bucket concerning the present invention. It is a hydraulic circuit diagram of the other modification of the cylinder apparatus used for one embodiment of the grab bucket concerning the present invention. It is a longitudinal cross-sectional view of the modification of the cylinder apparatus used for one embodiment of the grab bucket concerning the present invention. It is a cross-sectional view of the modification of the cylinder apparatus used for one embodiment of the grab bucket concerning the present invention. FIG. 1 is a perspective view during assembly of an embodiment of a grab bucket according to the present invention;

An embodiment of a grab bucket according to the present invention will be described with reference to the drawings. Note that this embodiment is merely an example, and the present invention is not limited to this. The same or similar configurations will be denoted by the same reference symbols, and overlapping descriptions will be omitted.

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

The grab bucket 10 of the present embodiment has a cylinder device 20, a first frame 11, a second frame 12, a pair of shells 13 and a movable frame 14. The cylinder device 20 is a so-called hydraulic cylinder device in which the working fluid is oil. The rod 40 protrudes from the first end 91 side of the cylinder device 20.

The movable frame 14 is fixed to an end of the rod 40 which protrudes from the first end 91 side of the cylinder device 20. The movable frame 14 is disposed to face the first frame 11. A wire 16 is coupled to the movable frame 14. The wire 16 is hung on a hanger 17. The hanger 17 is moved up and down by, for example, a hook of a crane. Each of the first frame 11 and the movable frame 14 incorporates a sheave 94 therein. One end of the wire 16 is hung on a hanger 17. The other end of the wire 16 is fixed to the movable frame 14 via a sheave 94.

The second frame 12 is fixed to the second end 92 side of the cylinder device 20. The pair of shells 13 is rotatably supported by the shaft 93 of the second frame 12 respectively. A connector 15 extending between the first frame 11 and a shaft 93 which is a support portion of the second frame 12 of each shell 13 is attached to both sides.

FIG. 2 is a longitudinal sectional view of the cylinder device in the present embodiment. FIG. 3 is a cross-sectional view of the cylinder device in the present embodiment.

The cylinder device 20 comprises a cylinder tube 23, a piston 41, a rod 40, a first closing block 21, a second closing block 22, a check plate 43 and a container wall 30. The cylinder tube 23 is formed in a cylindrical shape extending from the first end 91 to the second end 92. The internal space of the cylinder tube 23 is filled with the working fluid.

The piston 41 closes the internal space of the cylinder tube 23. The piston 41 divides the internal space of the cylinder tube 23 into a first space 48 on the first end 91 side and a second space 49 on the second end 92 side. The piston 41 is formed, for example, in a disk shape. The piston 41 is fixed to one end of the rod 40. The piston 41 is formed with a through hole 42 penetrating in the axial direction of the cylinder tube 23. A check plate 43 is mounted on the upper surface of the through hole 42. The check plate 43 is, for example, an annular plate. The check plate 43 closes the flow from the first end 91 side to the second end 92 side of the cylinder tube 23 through the through hole 42. The opposite end of the end of the rod 40 fixed to the piston 41 protrudes from the first end 91 of the cylinder tube 23.

The first closing block 21 closes the first end 91 of the cylinder tube 23. The second closing block 22 closes the second end 92 of the cylinder tube 23.

The container wall 30 forms a space with the outer surface 24 of the cylinder tube 23. This space is called a working fluid holding space 31. The container wall 30 is, for example, a cylinder.

The first closing block 21 is formed with a first flow passage 26 communicating with the first space 48 inside the cylinder tube 23 and the working fluid holding space 31. A second flow passage 25 communicating with the second space 49 inside the cylinder tube 23 and the working fluid holding space 31 is formed in the second closing block 22.

A logic valve 51 is inserted in the middle of the first flow path 26. A part of the working fluid circuit that controls the logic valve 51 is stored in the circuit storage block 27. The circuit storage block 27 is fixed to the first closing block 21. The circuit storage block 27 is provided with a button 28.

A discharge valve 32 for working fluid is attached to the logic valve 51. The discharge pipe 32 extends the working fluid holding space 31. Since the discharge pipe 32 extends the working fluid holding space 31, the working fluid that has passed the logic valve 51 is not discharged to the air layer formed above the working fluid holding space 31. As a result, mixing and generation of air bubbles in the working fluid is suppressed.

At the second end 92 side of the cylinder device 20, a fixing claw 60 for fixing to the second frame 12 is provided. The fixing claw 60 is formed integrally with, for example, the second closing block 22. A pin fixing hole 61 is formed in the fixing claw 60.

FIG. 4 is a longitudinal cross-sectional view of an attachment portion of the cylinder device to the second frame in the present embodiment.

The second frame 12 includes a first lateral support member 67, a second lateral support member 68, and an axial support member 66. The first lateral support member 67 and the second lateral support member 68 are, for example, flat plates perpendicular to the axis of the cylinder tube 23.

The first lateral support member 67 and the second lateral support member 68 are formed with holes into which the cylinder device 20 is fitted. The hole formed in the first lateral support member 67 is fitted, for example, in the largest diameter part of the second closing block 22 of the cylinder device 20. The hole formed in the second lateral support member 68 is fitted, for example, in the tip portion of the fixing claw 60 of the cylinder device 20.

The axial support member 66 is, for example, erected on the second lateral support member 68. The axial support member 66 is formed with a hole through which the fixing pin 63 can pass. The fixing pin 63 is inserted into the hole formed in the axial support member 66 and the pin fixing hole 61 of the fixing claw 60. The pin head 65 formed on one end of the fixing pin 63 and the pin fixing pin 64 inserted in the end opposite to the pin head 65, the pin for fixing the pin fixing hole 61 in the depth direction The movement of 63 is limited. The fixing pin 63 can pass through the access port 62 formed in the second frame 12 to reach the pin fixing hole 61.

By restricting the movement of the fixing pin 63 in this manner, the axial movement of the fixing claw 60, that is, the entire cylinder device 20 is restricted. In addition, the movement of the cylinder device 20 is restricted by the first lateral support member 67 and the second lateral support member 68 at two places in the axial direction in the direction perpendicular to the axis of the cylinder tube 23. Thus, in the present embodiment, the cylinder device 20 is held so as to restrict the relative movement of the cylinder device 20 relative to the second frame 12 in the axial and lateral directions.

If, for example, the second closing block 22 is provided with a flange and the flange is fixed by screwing it to the second frame or the like, a certain amount of space is required for working at the flange portion. On the other hand, in the present embodiment, the cylinder device 20 can be fixed by inserting the fixing pin 63 and fixing one end of the fixing pin 63. For this reason, the fixing | fixed part to the 2nd flame | frame 12 of the cylinder apparatus 20 can be made small. Also, assembly and disassembly are easy.

FIG. 5 is a circuit diagram of a working fluid circuit of the cylinder device in the present embodiment.

The working fluid circuit of the present embodiment includes a logic valve 51, a solenoid valve 53, a bypass check valve 54, a bypass throttle 56, and a pressure valve 52. The logic valve 51 is inserted in a flow path connecting the first space 48 of the cylinder tube 23 and the working fluid holding space 31.

The solenoid valve 53 is provided between the first space 48 and the pilot port of the logic valve 51. A throttle 57 may be inserted between the solenoid valve 53 and the first space 48.

The bypass check valve 54 is provided between the solenoid valve 53 and the pilot port of the logic valve 51. The bypass check valve 54 shuts off the flow from the pilot port of the logic valve 51 to the solenoid valve 53 side. The bypass throttle 56 is provided in parallel with the pressure valve 52 and the bypass check valve 54. The pressure valve 52 is closed when the pressure in the first space 48 of the cylinder tube 23 is equal to or higher than a predetermined value, and the pilot of the logic valve 51 is closed when the pressure in the first space 48 is lower than the predetermined value. Communication between the port and the solenoid valve 53 is established. The bypass throttle 56 establishes communication between the pilot port of the logic valve 51 and the solenoid valve 53 regardless of the switching set pressure of the pressure valve 52.

Next, the operation of the grab bucket 10 will be described.

First, the shell 13 is in an open state. In this state, the rod 40 is pulled out most from the cylinder tube 23. In the space inside the cylinder tube 23, the volume of the first space 48 is the smallest, and the volume of the second space 49 is the largest. In this state, the electromagnetic valve 53 is in a closed state by demagnetization.

While the shell 13 is open, the grab bucket 10 is lowered to the upper surface of the cargo to be transported by operating a crane or the like that suspends the hanger 17 or the like. After landing the cargo with the shell 13 of the grab bucket 10 open, when the crane is further lowered, the movable frame 14 is lowered by its own weight. When the movable frame 14 further descends, the movable frame 14 stops approaching the second frame 12 due to the contact of the movable frame 14 with the second frame 12 or the like. Thereby, the check plate 43 inside the cylinder tube 23 is closed, and the movement of the working fluid from the second space 49 to the first space 48 through the through hole 42 is stopped.

Next, the hanger 17 is raised. The rod 40 is pulled up from the cylinder tube 23 by the lifting of the hanger 17. When the rod 40 is pulled up from the cylinder tube 23, the pressure in the first space 48 of the cylinder tube 23 rises. Since the solenoid valve 53 is closed, the pressure in the first space 48 of the cylinder tube 23 is transmitted to the pilot port of the logic valve 51, and the logic valve 51 is in a closed state. As a result, the working fluid in the first space 48 does not move, and the cylinder tube 23 is pulled up with the rod 40. As a result, the shell 13 is closed and a gripping operation is performed.

When the shell 13 is in the closed state, the closing operation of the shell 13 ends. With the shell 13 closed, there is a gap between the first frame 11 and the movable frame 14. In this state, high pressure is generated in the first space 48 of the cylinder tube 23.

While holding the cargo in the closed space of the shell 13, the hanger 17 is moved by a crane or the like to move the grab bucket 10 above the cargo transfer destination. When the grab bucket 10 moves to the upper side of the transfer destination, the shell 13 is opened. The opening operation of the shell 13 is performed by exciting the solenoid valve 53 to open it.

When the solenoid valve 53 is closed, the first space 48 of the cylinder tube 23 is at high pressure. As a result, the pressure valve 52 is in a closed state. In this state, when the solenoid valve 53 is excited to open, the working fluid in the flow path connected to the pilot port of the logic valve 51 holds the working fluid at the speed set by the bypass throttle 56, that is, low speed. I will escape to space 31. As a result, the pressure at the pilot port of the logic valve 51 gradually decreases. As a result, the logic valve 51 opens gently. Therefore, the working fluid is slowly discharged to the working fluid holding space 31 via the logic valve 51.

The logic valve 51 gradually opens, and the pressure in the first space 48 of the cylinder tube 23 decreases. That is, the pressure in the first space 48 of the cylinder tube 23 is depressurized. When the working fluid is slowly discharged and the movable frame 14 and the first frame 11 contact, the pressure in the first space 48 of the cylinder tube 23 decreases rapidly. The pressure valve 52 opens when the pressure in the reduced first space 48 falls below a predetermined pressure. When the pressure valve 52 is in the open state, the working fluid is discharged at a flow rate higher than that of the bypass throttle 56 alone. Therefore, opening and closing of the logic valve 51 responds at high speed following opening and closing of the solenoid valve 53.

As described above, in the grab bucket of the present embodiment, when the pressure in the first space 48 inside the cylinder tube 23, that is, the space on the rod 40 side at least until the movable frame 14 contacts the first frame 11, is high. The flow of the working fluid from the first space 48 to the second space 49 is gentle. Therefore, the rapid movement of the rod 40 is suppressed, and the impact such as the collision of the movable frame 14 with the first frame 11 is suppressed. As a result, damage to the grab bucket is suppressed. Further, the noise due to the collision of the movable frame 14 with the first frame 11 is also reduced. Therefore, the shock absorption structure of the first frame 11 and the movable frame 14 can be simplified and the cost can be reduced.

After the movable frame 14 contacts the first frame 11 and is sufficiently depressurized, the pressure in the first space 48 inside the cylinder tube 23, ie, the space on the rod 40 side, is lower than the predetermined pressure, the first The flow of the working fluid from the space 48 to the second space 49 is rapid. Therefore, when the risk of shock and damage is small, the opening / closing operation of the shell 13 can be performed at high speed by the high-speed opening / closing operation of the logic valve 51.

Furthermore, only one solenoid valve is used to switch the opening operation of the shell 13 to low speed and high speed. This simplifies the control device. As a result, the cost of the control device for the opening operation of the shell 13 is reduced, and the reliability is improved.

When excitation of the solenoid valve 53 can not be performed, such as at the time of a test or at the time of emergency, the opening operation of the solenoid valve 53 can be manually performed by pressing a button provided on the circuit storage block 27.

FIG. 6 is a circuit diagram of a modification of the working fluid circuit of the cylinder device in the present embodiment.

In this modification, the pressure valve 52 in FIG. 5 is replaced with a pressure valve 50 and a relief valve 59 having a lower switching set pressure. Above the high pressure set value, the relief valve 59 starts blowing, and the back pressure of the relief valve 59 is input to the pressure valve 50. As a result, the pressure valve 50 is closed. When the pressure falls below the low pressure set value, the relief valve 59 stops blowing and the pressure valve 50 opens.

Pressure valves with very high switching pressure are less for so-called general purpose products. Therefore, using a pressure valve with a very high switching pressure leads to an increase in cost. On the other hand, in this modification, instead of the pressure valve whose switching pressure is very high, the relief valve 59 and the pressure valve 50, that is, the hydraulic switching valve are used. Hydraulic switching valves are abundant in general-purpose products. Therefore, it is inexpensive and highly reliable. Therefore, this modification can reduce the cost of the entire working fluid circuit and improve the reliability.

FIG. 7 is a circuit diagram of another modification of the working fluid circuit of the cylinder device in the present embodiment.

The working fluid circuit of this modification includes a logic valve 51, a solenoid valve 55, a first throttle 81, a second throttle 82, and a pressure valve 52. The logic valve 51 is inserted in a flow path connecting the first space 48 of the cylinder tube 23 and the working fluid holding space 31. The first throttle 81 is inserted in a flow path connecting the first space 48 of the cylinder tube 23 and the pilot port of the logic valve 51. The second throttle 82 is inserted in a flow path connecting the pilot port of the logic valve 51 and the solenoid valve 55. The solenoid valve 55 is inserted in a flow path connecting the second throttle 82 and the working fluid holding space 31. Thereby, the pilot port of the logic valve 51 is connected to the flow path between the first throttle 81 and the second throttle 82.

The pressure sensor of the pressure valve 52 is connected to the flow passage between the first throttle 81 and the second throttle 82. The pressure valve 52 opens to form a flow path that bypasses the second throttle 82 if the pressure between the first throttle 81 and the second throttle 82 is less than a predetermined pressure.

Also in this modification, the same operation as that of the above-described embodiment is performed.

In the grab bucket of the present embodiment, the flow path of the working fluid outside the cylinder tube 23 is realized by the working fluid holding space 31 formed integrally with the cylinder tube 23. For this reason, it is not necessary to use external parts, such as a pressure hose. Therefore, parts that easily change shape due to pressure changes, such as hoses, are reduced. As a result, even if a pressure change occurs with use, it is possible to suppress the deterioration of the component or the connection portion of the component.

In addition, since the flow path of the working fluid outside the cylinder tube 23 is formed integrally with the cylinder tube 23, the external parts such as the hose may receive an impact due to contact with other devices or the like, causing deterioration or damage. Can reduce the possibility of

FIG. 8 is a longitudinal sectional view of a modification of the cylinder device in the present embodiment. FIG. 9 is a cross-sectional view of a modification of the cylinder device in the present embodiment.

In the cylinder device 20 of the present modification, the solenoid valve storage block 29 is attached to the second closing block 22. The solenoid valve storage block 29 houses a solenoid valve 53 (or a solenoid valve 55). A pilot line 58 extends through the hydraulic fluid holding space 31 to the solenoid valve storage block 29. Thus, the solenoid valve 53 can be disposed on the second end 92 side of the cylinder device 20, that is, on the side closer to the second frame 12.

Basically, the grab bucket 10 of the present embodiment is used in a posture in which the second frame 12 is vertically lower than the first frame 11. Therefore, in the present modification, the solenoid valve 53 is disposed at a lower position.

In this modification, since the button 28 is at a low position and easy to access, when the manual opening operation of the solenoid valve 53 is required, such as during a test or in an emergency, the button 28 can be easily operated. In addition, it is safe because workers do not have to go up to a high position.

Next, a method of manufacturing the grab bucket 10 will be described.

FIG. 10 is a perspective view during and after assembly of the grab bucket in the present embodiment.

First, parts such as the cylinder device 20 of the grab bucket 10, the first frame 11, the second frame 12, the pair of shells 13, the movable frame 14 and the like are manufactured. Next, as shown in FIG. 10A, these components are stored in the container 70. When the components of the grab bucket 10 are stored in the container 70, the components are fixed to the base 71. The base 71 is also housed in the container 70. The first frame 11, the second frame 12, the movable frame 14 and the cylinder device 20 may be in an assembled state.

A wheel 72 is attached to the lower surface of the base 71 in order to store the base 71 inside the container 70 and to draw the container 70 to the outside. Also, two rails 73 extend on the floor surface of the container 70. An upper and lower transfer mechanism, a horizontal direction transfer mechanism, a rotating mechanism and other jigs for assembling the grab bucket 10 may be fixed to the base 71. The upper and lower transport mechanism, the horizontal transport mechanism, and the rotation mechanism may be realized by one device or may be realized by a plurality of devices. Alternatively, a plurality of devices may be used in combination. The base 71 may have, for example, a frame structure in which rods are combined. The base 71 may have a panel structure. In the case of the panel structure, the panel may be opened at the time of assembly. An open panel may be used as a workbench. An open panel may be used as part of a jig for assembly.

Next, as shown in FIG. 10 (b), the base 71 is pulled out of the container 70. Since the lower wheel 72 is on the rail 73, the base 71 can be pulled out with a small force. The winch or the like may be detachably attached to the base 71 and placed, and may be used for moving the base 71. Also, the base 71 may roll off by jacking up one end of the rail 73. The base 71 may be pushed out using a jack.

After the base 71 is pulled out of the container 70, as shown in FIG. 10C, the shells 13 are horizontally rotated using, for example, a rotating jig so as to face each other. As a result, the pair of shells 13 are in an attitude facing each other. Also, the posture of the assembly of the first frame 11, the second frame 12, the movable frame 14 and the cylinder device 20 is raised.

Next, as shown in FIG. 10D, the assembly of the first frame 11, the second frame 12, the movable frame 14 and the cylinder device 20 is moved vertically upward using the rack 74. The gantry 74 may be a part of the base 71, or may be easily assembled using parts constituting the base 71.

The shell 13 is attached to a predetermined position of the second frame 12 while the assembly of the first frame 11, the second frame 12, the movable frame 14 and the cylinder device 20 is moved vertically and held. Thereafter, the coupling body 15 is attached and the grab bucket 10 is completed.

As described above, by storing the assembly of parts of the grab bucket 10 together with the base 71 in the container 70 so that the base 71 can be carried out of the container 70, the grab bucket 10 can be easily installed at an installation place or the like. It can be assembled.

For example, a container having a length of 40 feet (12, 192 mm), a width of 8 feet (2, 438 mm), and a height of 9 feet, 6 inches (2, 896 mm) is used as the container 70. By using the ISO standardized and widely spread container 70, the cost of the container itself and the cost of transporting the container can be made much smaller than using a special storage case. For this reason, if the assembly cost of the grab bucket 10 is small, the cost required to install the product can be extremely reduced.

The parts of the grab bucket 10 are preferably unitized and modularized in advance. In addition to parts, materials, tools and tools for carrying out, storage and assembly from inside the container 70, it is also possible to use a lifting device capable of lifting, rotating and horizontally moving, and a unloading device capable of horizontally moving and rotating. By incorporating in the inside, without using special tools and large-capacity loading and unloading equipment at the transfer destination, the finished product equal to the quality assembled at the factory is covered by the transfer destination law at the transfer destination, It can be assembled safely. The parts, jigs, etc. which can be easily obtained at the transfer destination may be procured at the transfer destination.

It is preferable that lifting tools and jigs that can be transported and assembled only by human power be prepared so as not to use external power as much as possible. In addition, since the laws differ depending on the country, it is preferable to set the maximum mass of unitization so that there is no problem if it is taken to any transport destination. For example, when using a power winch, it is preferable to make the unit less than 3 t when it is assumed that one of the transport destinations is a country where a 3 t or more crane is treated as a mobile crane and manufacturing inspection is required. Alternatively, in this case, the power may be human power.

In the present embodiment, the base 71 is carried out of the container 70 by moving the wheels 72 attached to the base 71 to the rails 73. However, for example, the base 71 may be transported by running the wheels 72 on the upper surface of the plate.

In addition, at the time of assembly, auxiliary parts may be attached to the respective parts in order to facilitate transportation and positioning. Auxiliary parts are removed by melting, cutting, unscrewing, etc. after assembly is complete or during assembly.

By providing a curved portion on the surface of the part or the auxiliary part, the change of the posture of the part may be facilitated. In addition, when fixed to the base 71, when the support is removed, the posture may be easy to assemble.

DESCRIPTION OF SYMBOLS 10 ... Grab bucket, 11 ... 1st frame, 12 ... 2nd frame, 13 ... Shell, 14 ... Movable frame, 15 ... Coupling body, 16 ... Wire, 17 ... Hanger, 20 ... Cylinder apparatus, 21 ... 1st closing block , 22: second closing block, 23: cylinder tube, 24: outer surface, 25: second flow passage, 26: first flow passage, 27: circuit storage block, 28: button, 29: solenoid valve storage block, 30: Container wall, 31: Working fluid holding space, 32: Discharge pipe, 40: Rod, 41: Piston, 42: Through hole, 43: Check plate, 48: First space, 49: Second space, 50: Pressure valve, 51 ... logic valve, 52 ... pressure valve, 53 ... solenoid valve, 54 ... bypass check valve, 55 ... solenoid valve, 56 ... bypass throttle, 57 ... throttle, 58 ... pilot line, 59 ... relief valve DESCRIPTION OF SYMBOLS 60 ... nail | claw for fixing, 61 ... pin fixing hole, 62 ... access port, 63 ... pin for fixing, 64 ... pinning, 65 ... pin head, 66 ... axial direction supporting member, 67 ... 1st horizontal direction supporting member, 68 ... Second lateral support member 70: container 71: base 72: wheel 73: rail 74: mount frame 81: first aperture 82: second aperture 91: first end 92: 92 Second end, 93 ... axis, 94 ... sieve, 95 ... solenoid valve

Claims

A cylinder tube which extends from the first end to the second end and is filled with a working fluid, and which covers the inner space of the cylinder tube and divides it into the first space and the second space, and is movable in the axial direction of the cylinder tube A piston having a through hole penetrating from the first end to the second end, a rod extending from the piston and extending beyond the first end, and closing the first end of the cylinder tube A first closing block, a second closing block closing the second end of the cylinder tube, and a check plate closing the flow of the working fluid from the first end to the second end of the through hole And a container wall forming a working fluid holding space between the outer surface of the cylinder tube and the working fluid holding space between the working fluid holding space and the first space A cylinder device and a hydraulic fluid circuit to flow the working fluid between the second space and,
A first frame disposed on the first end side of the cylinder device;
A second frame fixed to the second end of the cylinder device;
A pair of shells rotatably supported by the second frame on the second frame so as to be pivotable about an axis perpendicular to the cylinder tube;
A connector connecting the shell and the first frame on both sides with respect to the support portion;
A grab bucket characterized by having:
The first closing block is formed with a first flow passage communicating with the inner space of the cylinder tube and the working fluid holding space,
A second flow passage communicating with the inner space of the cylinder tube and the working fluid holding space is formed in the second closing block.
The grab bucket according to claim 1, characterized in that:
The working fluid circuit is
A logic valve inserted in a flow path connecting the first space and the working fluid holding space;
A solenoid valve provided between the first space and the pilot port of the logic valve;
A bypass check valve provided between the solenoid valve and the pilot port for closing the flow from the pilot port to the solenoid valve side;
A throttle provided in parallel with the bypass check valve;
When the pressure inside the first space is above a predetermined value, it is in the closed state, and when the pressure inside the first space is below the predetermined value, the pilot port and the solenoid valve are communicated. Pressure valve, and
The grab bucket according to claim 1 or 2, further comprising:
The working fluid circuit is
A logic valve inserted in a flow path connecting the first space and the working fluid holding space;
A first throttle provided between the first space and the pilot port of the logic valve;
A solenoid valve provided between the first throttle and the second space;
A second throttle provided between the solenoid valve and the first throttle;
Provided in parallel with the second throttle, the pressure in the flow path between the first throttle and the second throttle is closed when the pressure is equal to or higher than a predetermined value, and the first throttle and the second throttle A control valve that causes the first throttle and the solenoid valve to communicate with each other when the pressure in the flow passage between the second throttle and the second throttle is less than a predetermined value;
The grab bucket according to claim 1 or 2, further comprising:
A cylinder tube extending from the first end to the second end and being filled with the working fluid;
The inner space of the cylinder tube is closed to divide the space into a first space and a second space, and a through hole is formed that is movable in the axial direction of the cylinder and penetrates from the first end to the second end. With the piston,
A rod projecting from the piston and extending beyond the first end;
A first closing block closing the first end of the cylinder;
A second closing block closing the second end of the cylinder;
A check plate for closing the flow of the working fluid from the first end side of the through hole toward the second end side;
A container wall defining a working fluid holding space between the cylinder tube and the outer surface of the cylinder tube;
The working fluid is caused to flow between the working fluid holding space and the inner space of the cylinder tube on the first end side, and between the working fluid holding space and the inner space of the cylinder tube on the second end side. Working fluid circuit,
A cylinder device characterized by having.
Container and
A base housed inside the container;
An unloading mechanism for unloading the base to the outside of the container;
A cylinder tube which extends from the first end to the second end and is filled with the working fluid, and is capable of closing the inner space of the cylinder and being movable in the axial direction of the cylinder tube, from the first end to the second end A piston having a through hole formed in the side, a rod extending from the piston and extending beyond the first end, a first closing block for closing the first end of the cylinder, and the first of the cylinder tubes A second closing block closing the two ends, a check plate closing the flow of the working fluid from the first end to the second end of the through hole, and a container wall forming a working fluid holding space Between the working fluid holding space and the inner space of the cylinder at the first end and between the working fluid holding space and the inner space of the cylinder tube at the second end A cylinder device that is secured to the base provided with a working fluid circuit to flow the working fluid,
A first frame fixed to the base and disposed on the first end of the cylinder device;
A second frame fixed to the base and fixed to the second end of the cylinder device;
A pair of shells fixed to the base and capable of being rotatably supported by the second frame on the second frame so as to be pivotable about an axis perpendicular to the cylinder;
A connector fixed to the base and capable of connecting the shell and the first frame on both sides with respect to the support;
A grab bucket part assembly characterized by having: