JPH11280071A - Device for attaching / detaching back stay of pile driver and its attaching / detaching method - Google Patents

Abstract

(57) [Problem] To provide an attachment / detachment method and an attachment / detachment method for a backstay of a pile driver, which can reduce labor required for connecting a backstay and a rear part of a pile driver body such as a rear beam. A hydraulic cylinder is provided as a means for inserting and removing a pin for connecting the back stay to a rear portion of a pile driver body. In the operation circuit of the hydraulic cylinder 10, relief valves 30 and 31 for setting the hydraulic pressure supplied to the hydraulic cylinder 10 to a hydraulic pressure lower than the hydraulic pressure corresponding to the force acting on the pin after assembling the pile driver are provided. Only when the gate lock lever is locked, the hydraulic cylinder 1
Gate lock lever interlocking changeover valve 2 that enables zero operation
4 is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for attaching / detaching a backstay for supporting a leader of a pile driver to a rear portion of the main body of the pile driver.

[0002]

2. Description of the Related Art In a conventional pile driving machine, when assembling the pile driving machine, a leader is generally raised to a certain angle by an auxiliary crane, and thereafter, the leader is raised via a wire rope by an undulating winch on the main body of the pile driving machine. The backstay is gradually raised, and when the leader stands up to an angle at which the backstay can be connected to the rear beam at the rear of the pile driver body, the backstay is manually connected to the rear beam using bolts and pins. Conversely, when disassembling the pile driver, the bolts and pins connecting the rear beam of the backstay are disconnected by human power by a reverse operation to release the connection between the two, and the leader is lifted using an up / down winch or an auxiliary crane. knock down.

[0003]

Conventionally, when the back stay is attached to and detached from the rear beam by bolts, since the structure is such that bolts and the like are manually attached and detached, there is a problem that a great deal of labor is required. .

[0004] Conventionally, there has been provided a structure in which an assembling operator can disconnect the backstay and the rear beam regardless of the intention of a machine manager such as an operator.

The present invention has been made in view of the above-mentioned problems in the prior art, and has been made in consideration of the above-mentioned problems of the prior art. The aim is to provide a method.

It is another object of the present invention to provide an apparatus and a method for attaching and detaching a backstay of a pile driver that prevents the backstay from being attached or detached during operation.

[0007]

According to a first aspect of the present invention, there is provided a backstay attaching / detaching device for a pile driver, comprising: a back stay for connecting a leader of the pile driver and a rear portion of the main body of the pile driver to support the leader;
In the device that is attached to and detached from the rear part of the pile driver body, a hydraulic cylinder is provided as a means for inserting and removing a pin connecting the back stay to the rear part of the pile driver body.

[0008] Thus, the back stay and the rear portion of the pile driver body can be attached and detached by the hydraulic cylinder, and the labor required for attachment and detachment can be reduced.

According to a second aspect of the present invention, in the first aspect of the present invention, in the first aspect, the hydraulic circuit supplied to the hydraulic cylinder is applied to the operating circuit of the hydraulic cylinder on the pin after assembling the pile driver. A relief valve that is set at a hydraulic pressure lower than the hydraulic pressure corresponding to the force to be applied.

By setting the pressure of the relief valve so that the hydraulic pressure acting on the hydraulic cylinder is lower than the hydraulic pressure corresponding to the supporting force acting on the pin during the operation of the pile driver, Even when the control valve of the cylinder is operated to insert and remove the hydraulic cylinder, it is impossible to insert and remove the pin because the relief valve operates during the operation of the pile driver.

According to a third aspect of the present invention, in the first or second aspect, the backstay mounting / removing device for the pile driver is provided in the operation circuit of the hydraulic cylinder, the gate lock being provided in an operator's cab and locking a hydraulic actuator of the pile driver. A gate lock lever interlocking switching valve that enables the operation of the hydraulic cylinder only when the lever is in a locked state is provided.

Thus, the connecting pin of the back stay can be inserted and removed only when the gate lock lever is in the locked state, that is, only when the hydraulic actuators other than the back stay connecting hydraulic cylinder of the pile driver are inoperable. Becomes

According to a fourth aspect of the present invention, in the third aspect of the present invention, there is provided an apparatus for attaching and detaching a backstay of a pile driver according to the third aspect, wherein the hydraulic circuit of the hydraulic cylinder is further switched by an operation switch outside a cab to determine whether or not the hydraulic cylinder can be operated. And a switching valve that performs the switching.

Thus, the operation of the hydraulic cylinder by the control valve is enabled when the gate lock lever is in the locked state and the switching valve is in the switching position allowing the operation of the hydraulic cylinder. Only the operation of the pin by the hydraulic cylinder becomes possible.

According to a fifth aspect of the present invention, there is provided a backstay attaching / detaching device for a pile driver according to any one of the first to fourth aspects, wherein the hydraulic cylinder is used as a pin for connecting the backstay and a rear portion of the pile driver body. In addition to the pin to be inserted and removed, a manual pin that is manually inserted and removed is provided.

Thus, even if the pin inserted and removed by the hydraulic cylinder is removed, the state in which the manual stay pin is connected to the back stay and the rear portion of the pile driving machine body can be maintained, and the assembler can directly connect the pin. Since the pin is pulled out by operating the pin, the pin is pulled out with great care, and it is possible to minimize the occurrence of an accident such as the rear end of the back stay falling.

According to a sixth aspect of the present invention, there is provided a method for attaching and detaching a backstay of a pile driver, wherein the backstay for connecting the leader of the pile driver and the rear portion of the main body of the pile driver to support the leader is provided. In the method of attaching and detaching, a hydraulic cylinder is provided as a means for inserting and removing a pin connecting the back stay to a rear portion of the pile driver body, and a gate lock provided in an operator's cab and locking a hydraulic actuator of the pile driver. Only when the lever is in the locked state, by operating the hydraulic cylinder by operating the hydraulic cylinder,
It is characterized in that a pin for connecting the backstay and the rear part of the pile driver body is inserted and removed.

Thus, the pin is inserted and removed by the hydraulic cylinder only while the pile driver is not working.

A backstay for attaching and detaching the backstay of the pile driver according to claim 7, wherein the backstay for connecting the leader of the pile driver and the rear of the main body of the pile driver to support the leader is provided on the rear of the main body of the pile driver. The method of attaching and detaching the backstay includes a pin that connects and disconnects the backstay and a rear portion of the pile driver body, a pin that is inserted and removed by the hydraulic cylinder, and a manual pin that is manually inserted and removed, and the backstay is connected to the pile. When removing the pin from the rear part of the driving machine body, the pin is pulled out by a hydraulic cylinder, and then the manual pin is pulled out.

[0020] With this, since the manual pin is pulled out after the hydraulic cylinder pulls out the pin,
The manual pin is pulled out in a state in which the rear end of the back stay is prepared to be prevented from dropping due to the pulling out of the pin.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a side view showing an example of a pile driving machine embodying the present invention, and FIGS. 2 (A) and 2 (B) each show a rear beam of a pile driving body at the rear end of a back stay. FIGS. 3A and 3B are a front view and a plan view, respectively, showing a connecting portion. FIGS. 3A and 3B are respectively a longitudinal sectional view and a transverse sectional view showing a pin connecting portion of a backstay by a hydraulic cylinder, and FIGS. FIG. 5 is an exploded side view showing a bracket at the rear end of the backstay and a bracket attached to the rear beam, and a side view showing an assembled state. FIG. 5 is a hydraulic circuit diagram showing an operation circuit of the hydraulic cylinder according to the present embodiment, and FIG. 4A and 4B are a perspective view showing a mounting structure of a gate lock lever and a partial side view of a pile driver body showing a mounting structure of an operation pendant switch in the present embodiment.

In the pile driver shown in FIG. 1, a leader is pinned on the front of the pile driver main body 1 so as to be able to undulate, and between the leader 2 and a rear beam 3 extending to the left and right at the rear of the pile driver main body 1. Each of the back stays 4 is attached, and the hydraulic cylinder 5 attached to the rear end of the back stay 4 is extended and contracted, so that the vertical posture of the reader 2 is maintained.

Reference numeral 6 denotes an up / down winch mounted on the excavator body 1, and the leader 2 is wound up on the up / down winch 6 when the pile driver is assembled and disassembled. 2 is supported in an inclined posture.

As shown in FIGS. 2A and 2B, the rear beam 3 has a hydraulic cylinder 1 for attaching and detaching a backstay connecting pin.
The bracket 11 for attaching the 0 is attached. As shown in FIGS. 3A and 3B, a backstay connecting pin 13 is connected to the piston rod 10a of the pin attaching / detaching hydraulic cylinder 10 by connecting the pin 12 thereto.

As shown in FIGS. 4A and 4B, the end 5b of the piston rod 5a of the hydraulic cylinder 5 of the back stay 4 is formed in a spherical shape, and the spherical portion 5b is fitted to the spherical bearing 14. You. The spherical bearing 14 includes the bracket 11
3 (A) and 3 (B).

As shown in FIG. 4A, the bracket 15 on the back stay 4 side has a pin hole 20 for inserting a pin 13 to be inserted and removed by a hydraulic cylinder 10 and a pin hole for inserting a pin 17 for manual operation. 21 and 22. In the bracket 11 on the rear beam 3 side, a pin hole 16 for inserting the hydraulic cylinder pin 13,
2, two pin holes 18 and 19 are provided. The brackets 11 and 15 are provided with two pin holes 18, 19 and 21, 22, respectively, because the angle of the back stay 4 is changed according to the length of the reader 2 and the length of the back stay 4. , Manual pin 1
7 is changed to the pin holes 18 and 21 or 19 and 22. The angle between the line connecting the pin hole 16 and the pin holes 18 and 19, and the line connecting the pin hole 20 and the pin holes 21 and 22 respectively. And the angle made.

FIG. 5 shows an operation circuit of the hydraulic cylinder 10. As shown in FIG. 6A, reference numeral 24 denotes a switch which switches in response to the operation of a gate lock lever 26 provided at the entrance of the cab 25. The valve 27 is shown in FIG.
(B) shows a state in which the rear beam 3 is set up.) As shown in FIG.
Reference numeral 28 denotes a switching valve comprising a solenoid valve which is switched by turning on a power switch. Reference numeral 28 denotes a control valve which is switched by operating a switch on an operation switch 29.

Reference numerals 30 and 31 denote relief valves for short-circuiting the pipelines when the hydraulic pressure difference between the forward and return pipelines 32 and 33 of the hydraulic cylinder 10 exceeds a predetermined value.

When connecting or disconnecting the back stay 4 to or from the rear beam 3 at the time of assembling or disassembling the pile driver, the leader 2 is obliquely supported by the hoisting winch 6 via the hoisting rope 7 and the pendant rope 8. The rear portion of the backstay 4 is supported by an auxiliary crane (not shown) or the like. At the time of assembling, the hoisting rope 7 is wound up or pulled out by the hoisting winch 6, and further, by operating an auxiliary crane or the like, the bracket 15 on the back stay 4 side is aligned with the bracket 11 on the rear beam 3 side. ) And (B), the pin hole 20 of the bracket 15 on the back stay 4 side and the pin hole 16 of the bracket 11 on the rear beam 3 side are aligned.
The pin mounting / dismounting hydraulic cylinder 10 is extended to
The pin 13 is inserted into 20.

As shown in FIG. 6 (A), the pin lock lever 26 is depressed and the hydraulic actuator of the pile driving machine (for running, turning, and winching) is inserted or pulled out of the pin 13 as shown by a two-dot chain line a in FIG. The operation of the hydraulic cylinder 10 is enabled only when the gate lock lever 26 that locks each hydraulic motor and the hydraulic cylinder 5 of the back stay 4 is in a locked state. FIG. 5 shows a case where the gate lock lever interlocking switching valve 24 is in a locked state. In this state, the pipeline 3 from the hydraulic pump 35 on the pile driver body 1 to each of the hydraulic actuators is shown.
The supply of the pressure oil to the hydraulic cylinder 10 is shut off by the switching valve 24, and the supply of the pressure oil to the hydraulic cylinder 10 is possible.

By keeping the gate lock lever 26 in the locked state and turning on the power switch of the operation switch 29, the switching valve 27 is switched from the right position to the left position as shown in FIG. The pressure oil can be supplied.

In this state, by operating the operation switch 29 to switch the control valve 28 to the left position or the right position, pressure oil is supplied to the pipe line 32 or 33 to extend the hydraulic cylinder 10. Alternatively, the pin 13 is contracted to insert or pull out the pin holes 16 and 20.

Here, the set pressure of the relief valves 30 and 31 is set so that the pin 13 cannot be inserted or removed when the support force of the leader 2 or the back stay 4 is acting on the pin 13 during the operation of the pile driver. Hydraulic pressure. That is, the set pressure of the relief valves 30 and 31 is changed during the operation of the pile driver.
Is set lower than the hydraulic pressure corresponding to the force acting on Pin 1
3, the back stay 4 is supported by the auxiliary crane, so that the pin 13 and the pin hole 1 are inserted.
The frictional force between the pins 6 and 20 is small, and the pins 13 can be inserted and removed by the hydraulic cylinder 10.

At the time of assembly, after the pin 13 is inserted by the hydraulic cylinder 10, the pin holes 1 of the brackets 11 and 15 are inserted.
The manual pins 17 are inserted into the pins 8 and 21 and locked by the pin stopper stoppers 34 (see FIGS. 3B and 4B). At the time of pulling out, by first pulling out the pin 13 by the hydraulic cylinder 10 and then pulling out the manual pin 17, it is possible to prevent the rear end of the back stay 4 from being inadvertently dropped. That is, the hydraulic cylinder 1
At the time of pulling out by 0, remote work is performed by the control valve 28. However, when pulling out the pin 17 manually, the work is performed near the pin 17, so there is no danger of the back stay 4 dropping. Work is done in the state,
Increases safety.

In practicing the present invention, a configuration may be adopted in which the switching valve 24 that is linked to the gate lock lever 26 or the switching valve 27 that is a solenoid valve or the like is not provided. Further, the control valve 28 may be of a manual type. The manual pin 17 may also be configured to be inserted and removed by a hydraulic cylinder. The present invention is also applicable to a structure in which the rear end of the back stay 4 is connected not to the rear beam 3 but to a connecting portion on the pile driver body 1.

[0036]

According to the first aspect of the present invention, the hydraulic cylinder is provided as a means for inserting and removing the pin for connecting the back stay to the rear portion of the excavator body, so that the labor of the operator is reduced. Also, since manual work near the pins is not required,
Safety is improved.

According to a second aspect of the present invention, there is provided the relief valve according to the first aspect, wherein the hydraulic pressure supplied to the hydraulic cylinder is set to a hydraulic pressure lower than the hydraulic pressure corresponding to the force acting on the pin after the pile driver is assembled. Therefore, the removal and insertion of the pin during the operation of the pile driver is prevented, and the safety is improved.

According to a third aspect, in the first or second aspect, when the gate lock lever provided in the operator's cab and locking the hydraulic actuator of the pile driver is in the locked state, Only the gate lock lever interlocking switching valve that enables the operation of the hydraulic cylinder is provided, so that pulling out of the pin by the hydraulic cylinder during the work of the pile driver is prevented, and safety is improved.

According to the fourth aspect, in the third aspect, the hydraulic circuit of the hydraulic cylinder further includes a switching valve for setting whether or not to operate the hydraulic cylinder by switching with an operation switch outside the cab. Further, safety is improved.

According to the fifth aspect, in any one of the first to fourth aspects, as a pin for connecting the back stay and the rear beam, a pin is manually inserted and removed other than a pin which is inserted and removed by the hydraulic cylinder. Since the manual pin is provided, even if the pin is pulled out by the hydraulic cylinder, the back stay can be stopped by the manual pin, further improving safety.

According to the present invention, the hydraulic cylinder can be operated and operated only when the gate lock lever provided in the cab and locking the hydraulic actuator of the pile driver is locked. By doing so, the pins for connecting the backstay and the rear beam are inserted and removed, so that the pins are prevented from being pulled out by the hydraulic cylinder during the work of the pile driver and safety is improved.

According to a seventh aspect of the present invention, as the pin for connecting the back stay and the rear beam, a pin which is inserted and removed by the hydraulic cylinder and a manual pin which is manually inserted and removed are provided, and the back stay is connected to the rear beam. When the pin is removed from the device, the pin is pulled out by the hydraulic cylinder, and then the manual pin is pulled out. Therefore, since a manual operation close to the pin and requiring careful attention is performed later, safety is enhanced.

[Brief description of the drawings]

FIG. 1 is a side view showing an example of a backstay attaching / detaching device of a pile driver according to the present invention and an example of a pile driver for implementing the attaching / detaching method.

FIGS. 2A and 2B are a front view and a plan view, respectively, showing a connection portion of a rear end of a back stay with a rear beam in the present embodiment.

FIGS. 3A and 3B are a longitudinal sectional view and a transverse sectional view, respectively, showing a pin connecting portion of a backstay by a hydraulic cylinder in the present embodiment.

FIGS. 4A and 4B are an exploded side view showing a bracket at the rear end of the back stay and a bracket attached to a rear beam and a side view showing an assembled state in the present embodiment, respectively.

FIG. 5 is a hydraulic circuit diagram for operating a hydraulic cylinder for attaching and detaching pins according to the present embodiment.

FIGS. 6A and 6B are a perspective view showing a mounting structure of a gate lock lever of the present embodiment and a partial side view of a pile driver body showing a mounting structure of a pendant switch for operation.

[Explanation of symbols]

1: Excavator body, 2: Leader, 3: Rear beam, 4: Back stay, 5: Hydraulic cylinder, 6: Undulating winch, 1
0: Hydraulic cylinder for attaching and detaching pins, 11: Bracket, 1
2: Connecting pin for hydraulic cylinder, 14: Spherical bearing, 15:
Bracket, 16, 18-22: Pin hole, 17: Manual pin, 24: Gate lock lever interlocking switching valve, 25: Operator's cab, 26: Gate lock lever, 27: Switching valve, 2
8: control valve, 29: operation switch, 30, 3
1: relief valve, 32, 33: go-back line, 34: stopper

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Kenichiro Date 650 Kandachicho, Tsuchiura City, Ibaraki Prefecture Inside the Tsuchiura Plant of Hitachi Construction Machinery Co., Ltd. Horiuchi

Claims (7)

[Claims] An apparatus for attaching and detaching a backstay for supporting a leader by connecting a leader of a pile driver and a rear portion of the pile driver body to the rear portion of the pile driver body, A back stay attaching / detaching device for a pile driver, characterized in that a hydraulic cylinder is provided as a means for inserting and removing a pin connecting the back stay. 2. The hydraulic circuit according to claim 1, wherein a hydraulic pressure supplied to the hydraulic cylinder is set to be lower than a hydraulic pressure corresponding to a force acting on the pin after assembling the pile driver in the operating circuit of the hydraulic cylinder. A backstay attachment / detachment device for a pile driver, provided with a relief valve. 3. The hydraulic cylinder according to claim 1, wherein a gate lock lever provided in an operator's cab and locking a hydraulic actuator of the pile driver is in a locked state in the operation circuit of the hydraulic cylinder. A backstay attaching / detaching device for a pile driver, comprising a gate lock lever interlocking switching valve that enables the operation of a backlash. 4. The pile driving method according to claim 3, wherein the hydraulic circuit of the hydraulic cylinder further includes a switching valve for setting whether or not to operate the hydraulic cylinder by switching with an operation switch outside the cab. Detachable device for back stay of machine. 5. The manual connection device according to claim 1, wherein the pin connecting the back stay and the rear portion of the pile driving machine body is a pin manually inserted and removed by the hydraulic cylinder. A backstay attachment / detachment device for a pile driver, comprising a pin for use. 6. A method for attaching and detaching a backstay for supporting a leader by connecting a leader of a pile driver and a rear portion of the pile driver body to the rear portion of the pile driver body. A hydraulic cylinder is provided as means for inserting and removing a pin connecting the back stay, and the hydraulic cylinder is provided only when a gate lock lever provided in an operator's cab and locking a hydraulic actuator of a pile driver is in a locked state. A pin for connecting the backstay and the rear portion of the main body of the pile driver is inserted and removed by operating the hydraulic cylinder so that the backstay of the pile driver can be attached and detached. 7. A method for attaching and detaching a backstay for supporting a leader by connecting a leader of a pile driver and a rear portion of the pile driver body to the rear portion of the pile driver body, As a pin connecting the rear of the machine main body, a pin that is inserted and removed by the hydraulic cylinder, and a manual pin that is manually inserted and removed are provided.When the back stay is removed from the rear of the pile driver main body, a hydraulic cylinder is used. A method for attaching and detaching a backstay of a pile driver, comprising removing a pin and then removing the manual pin.