KR102194098B1 - pile clamping apparatus of oil pressure with gripping detector portion - Google Patents

Abstract

Hydraulic clamp device having a grip detection unit of the pile of the present invention. A hydraulic cylinder for operating at least one jaw for gripping the pile, and hydraulic oil for selectively supplying hydraulic oil through the first and second ports installed in the hydraulic cylinder to manipulate the hydraulic cylinder to grip and release the pile A pressure detection unit for detecting the normal gripping of the pile and the status of the gripping pressure for gripping the pile by detecting the supply pressure of hydraulic oil when the pile is gripped by the operation of the unit and the hydraulic cylinder, and detection by the pressure detection unit A display unit for indicating whether the gripping force is in a normal state according to the signal, and a controller configured to supply hydraulic oil for increasing the gripping force of the cylinder using the hydraulic supply unit when the detected pressure is less than or equal to the set pressure.

Description

A hydraulic clamping apparatus having a gripping detection part of a pile

The present invention relates to a hydraulic clamp device, and more particularly, to a hydraulic clamp device equipped with a grip detection unit of a pile capable of safely gripping a pile for construction by being mounted on a driving machine, a pile hammer, etc.

Typically, in order to solidify the foundation of civil works or buildings such as bridges, dams, soft ground, port works, reinforced concrete structures, etc., foundation work is performed by constructing PHC piles, H-beams, sheet piles, etc. on the ground.

Methods of constructing the above piles include a punching method and an excavation method.

The punching method is to punch out the pile supported by the clamp using a leader installed vertically in the crawler driving device or a hammer, which is a weight that is lifted by a winding rope at the top, or lift the hammer using compressed air of a compressor. It is a method of constructing the pile supported by the clamp by punching out the pile supported by the clamp or applying vibration to the pile supported by the clamp using a pile hammer or vibrator installed at the end of the boom of an excavator.

In order to construct the pile by the method as described above, the Bible is made by gripping the pile using a clamp provided in a pile construction device such as a driving machine or a pile hammer, and applying vibration or driving force to the gripped pile.

In the process of construction of the pile as described above, if driving force or vibration is applied while the pile is not firmly gripped, it is difficult to construct a precise pile and there is a risk of safety accidents. In particular, since it is not possible to recognize the gripping state of the pile by the clamp of the vibro hammer or the driving machine that constructs the pile, it is not easy to secure the point of time to apply the driving force or vibration for the construction of the pile. In this case, smooth pile construction work cannot be performed.

Republic of Korea Patent Publication No. 2017-077074, the inventor of the present application filed for the clamp unit of the automatic pile driver is published, and Republic of Korea Patent Registration No. 1479423 discloses a configuration that improves the efficiency of the pile work with a tilting clamp.

Republic of Korea Patent Publication No. 2017-077074 Korean Patent Registration No. 1479423.

The present invention is to solve the above-described problems, the driver can easily recognize the clamping state and the release state of the pile, and it is easy to determine the timing of application of the operating force for the construction and drawing of the pile, and It is to provide a hydraulic clamp device having a gripping detection unit of a pile that can reduce the occurrence of safety accidents due to pulling.

Another object of the present invention is to detect the pressure applied to the cylinder, which is a hydraulic actuator for gripping the pile, and when it is lower than the set pressure, it is possible to adjust the pressure for stabilization of the gripping force, thereby increasing the reliability of the pile gripping It is an object of the present invention to provide a hydraulic clamp device having a gripping detection unit of.

A hydraulic clamp device having a gripping detection unit of a pile of the present invention for solving the above technical problem

A hydraulic cylinder for operating at least one jaw for gripping the pile, and hydraulic oil for selectively supplying hydraulic oil through the first and second ports installed in the hydraulic cylinder to manipulate the hydraulic cylinder to grip and release the pile A pressure detection unit for detecting the normal gripping of the pile and the status of the gripping pressure for gripping the pile by detecting the supply pressure of hydraulic oil when the pile is gripped by the operation of the unit and the hydraulic cylinder, and detection by the pressure detection unit A display unit that displays whether or not the gripping force is in a normal state by a signal, and a controller configured to supply hydraulic oil to increase the gripping force of the cylinder using the hydraulic supply unit when the detected pressure is less than the set pressure. It is characterized.

In the present invention, the piston of the hydraulic cylinder further includes an accumulator for buffering a pressure applied to the piston by hydraulic oil.

The hydraulic clamping device provided with the gripping detection unit of the pile of the present invention can accurately detect the operating state of the hydraulic cylinder clamping the pile, that is, the gripping status of the pile by the hydraulic cylinder, thereby preventing safety accidents due to poor gripping of the pile. I can.

In particular, the present invention can supply hydraulic oil to the hydraulic cylinder to completely grip the pile when the clamping force decreases due to a decrease in the supply amount of hydraulic oil in the pile while the hydraulic cylinder for gripping the pile is operated. Since the driver can accurately grasp the state of gripping the pile, the driving force or pulling force can be stably provided.

1 is a side view showing an excavator to which a hydraulic clamping device having a gripping detection unit of a pile according to the present invention is applied.
FIG. 2 is a perspective view schematically showing a hydraulic clamp device having a pile detection unit shown in FIG. 1.
Figure 3 is a perspective view showing another embodiment of the hydraulic clamp device according to the present invention.

A hydraulic clamp device having a gripping detection unit of a pile according to the present invention is for constructing or withdrawing a pile such as a driving machine or a pile hammer, and an embodiment thereof is shown in FIGS. 1 to 2.

Referring to the drawings, the hydraulic clamp device 10 having the gripping detection unit of the pile according to the present invention is used by being mounted on a driving machine, a pile hammer, etc., in this embodiment, mounted on the boom 210 of the excavator 200 It will be described with reference to the installation of the driving device 220.

The hydraulic clamping device 10 is for gripping the pile 100 for construction, and a jaw unit 20 for gripping the pile 100 and for operating at least one jaw of the jaw unit 20 Equipped with a hydraulic cylinder (30).

The jaw unit 20 is a fixed jaw 21 installed on the main body of the equipment for constructing a pile, and a movable jaw 22 for holding the pile 100 by being coupled and separated from the fixed jaw 21 It is equipped with. The rod 31 of the hydraulic cylinder 30 is connected to the movable jaw 22 to move the movable jaw 22 forward and backward with respect to the fixed jaw 21, while the pile 100 for construction (stitching a pile) and drawing Is clamped.

The hydraulic cylinder 30 includes a cylinder body 34 having first and second ports 32 and 33 respectively provided on both sides. A piston 35 coupled with a rod 31 is installed inside the cylinder body 34. In addition, the hydraulic cylinder 30 is provided with an accumulator 40 for supplementing (or buffering) hydraulic oil when the pile 100 is gripped. In the accumulator 30, a hollow portion 41 having a predetermined depth toward the rod 31 is formed in the piston 35, and at least one compression spring 42 is inserted into the hollow portion 41. In addition, the compression spring 42 is supplied to the cylinder body 34 through the first port 32 to the hollow part 41 to be compressed by pressure acting in the direction in which the rod 31 is withdrawn. A pressure piston 43 for accumulating by pressing the spring 42 is installed. The accumulator 40 is not limited by the above-described embodiment, and may be installed outside the hydraulic cylinder 30. For example, it may be installed in a first hydraulic pipe to be described later.

In addition, the accumulator may be formed by installing a pressure piston 43 in the hollow portion 41 of the piston 35, and filling the hollow portion 41 with an inert gas, for example, nitrogen gas. The nitrogen gas filled in the hollow part 41 may be formed through a rod. In this case, a nitrogen gas filling part for filling nitrogen gas may be formed on the rod.

In addition, to operate the hydraulic cylinder 30, the hydraulic oil supply unit 50 selectively supplies hydraulic oil through the first, second ports 32, 33, and the pressure of hydraulic oil acting on the hydraulic cylinder 30. Based on the hydraulic cylinder 30 is provided with a file grip detection unit 60 for detecting the operating state and the clamping state of the pile 100.

The hydraulic oil supply unit 50 is connected to the first and second hydraulic pipes 51 and 52 for supplying and returning hydraulic oil to the first and second ports 32 and 33 of the hydraulic cylinder 30. In addition, the first and second hydraulic pipes 51 and 52 are a supply pipe 231 and a return pipe of a hydraulic oil supply unit (not shown) of equipment including a hydraulic pump installed in equipment for constructing the pile 100 such as an excavator. It is connected by 232 and the control valve 55. It is preferable to use a 2-port 3-position control valve as the control valve. A first check valve 56 is installed in the first hydraulic pipe 51 connected to the first port 32. The first check valve 56 is connected by a second hydraulic pipe 52 and a pilot pipe 57 to be operated by a return pressure acting on the second hydraulic pipe 52.

In addition, as shown in FIG. 3, a second check valve 57 may be installed between the first check valve 56 and the control valve 55 in the first hydraulic pipe 51.

On the other hand, the pile grip detection unit 60 is the inner space of the cylinder body 34 connected to the first port 32, that is, the cylinder body 34 in which pressure acts in the direction in which the rod 31 of the piston 35 is withdrawn. ) In accordance with the pressure signal detected by the pressure detection unit 61 installed in the body of the cylinder 34 to measure the pressure in the internal space (hereinafter referred to as the first chamber; 35a). And a controller 62 that compares and determines the state of the gripping pressure of 100 with a set value. Further, it is controlled by the controller 62 and includes a display portion 70 for indicating whether or not there is sufficient pressure to grip the pile 100.

In addition, when the pressure inside the first chamber 35a is lower than the set pressure, the controller 62 supplies hydraulic oil to the first chamber 35a by controlling the control valve 55 to supply hydraulic oil to the first chamber 35a. It is raised to a set pressure sufficient for gripping.

The pressure detection unit 61 may be formed of a pressure switch operated by the pressure supplied to the first chamber 35a.

Meanwhile, the pressure detection unit 61 may not be installed in the hydraulic cylinder, but may be installed in the first hydraulic pipe 51 between the first and second check valves 56 and 58 as shown in FIG. 3. However, the present invention is not limited thereto, and may be installed in the first hydraulic pipe 51 between the first check valve 56 of the first hydraulic pipe 51 and the hydraulic cylinder 30.

The display unit 70 may be formed of a flashing lamp, a warning lamp, or a speaker controlled by the controller 61. However, the present invention is not limited thereto and may be configured as a display for displaying pressure as a level.

And although not shown in the drawing, the hydraulic oil supply unit of the equipment further includes a drive control unit for driving the pile hammer of the driving machine.

The operation of the hydraulic clamping device having the gripping detection unit according to the present invention configured as described above will be described as follows.

A driving machine 220 equipped with a hydraulic clamping device having a grip detection unit according to the present invention is installed on the boom 210 of the excavator 200. Then, the pile 100 is gripped using the boom 210 of the excavator 200 and the driving machine installed on the boom, and a driving or drawing operation is performed.

In this process, hydraulic oil for gripping the pile 100 by the operation of the control valve 55 is supplied to the first chamber 35a, and the pressure supplied to the first chamber 35a or the first and second check valves ( The pressure of the first hydraulic pipe 51 between 56 and 57 is sensed by the pressure detection unit 61, and the check valve 56 is operated when the gripping is completed, so that the first chamber 35a of the hydraulic cylinder is The hydraulic oil supplied to) is prevented from returning.

The pressure signal detected by the pressure detection unit 61 is transmitted to the controller 62, and the controller 62 compares the pressure value of the signal detected by the pressure detection unit 61 with the set pressure value When is reached or higher than this, a signal indicating that the clamping state of the file is stable is transmitted to the display unit 70. Accordingly, a warning light constituting the display unit is turned on or a speaker notifies the driver or auxiliary personnel of the stable state of the file.

As described above, when the warning light of the display unit is turned on or a stable gripping state of the pile is recognized by the speaker, the driver performs driving and pulling work for construction of the pile 100.

And if the warning light of the display unit goes out during the process of gripping the pile 100 or driving the pile 100, or when the pressure by the speaker is lower than the set pressure for gripping the pile, the driver stops the driving operation. Then, the controller 62 is operated to supply hydraulic oil to the first chamber 35a of the hydraulic cylinder 30 to perform the pile construction work while the pile 100 is stably gripped.

Meanwhile, since the accumulator 40 is installed in the hydraulic cylinder 30 during the operation as described above, a relatively large external force is applied to the movable jaw 21 and the rod 31 when the pile 100 is gripped. Even if the pressure in the first chamber (35a) acts on the pressure piston (43), the pressurized compression spring (42) or the filled nitrogen gas is further compressed, thereby damaging the clamping device holding the pile (100). This can be prevented, and the hydraulic oil inside the first chamber 35a is supplemented and buffered.

As described above, the hydraulic clamp device provided with the gripping detection unit according to the present invention can prevent safety accidents due to poor gripping of the pile because the driver or auxiliary worker can know the state in which the pile is gripped during driving or pulling of the pile. I can.

In particular, since the driver can know the clamping status of the pile by the pile clamp unit in the process of driving the pile, it can prevent the support of the pile from being released during the driving process, and reduce the working time according to the gripping of the pile. Since the work can be performed, the work efficiency according to the driving can be maximized.

In addition, the driving or drawing operation can be smoothly performed even if the driver's skill level for adjusting the excavator is increased during the driving operation or drawing operation of the pile. The driving force installed in the excavator can prevent the driving force or pulling force for constructing the pile from being dispersed due to poor gripping of the pile.

The present invention has been described with reference to the embodiments shown in the drawings, but these are only exemplary, and those of ordinary skill in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention should be determined by the technical idea of the attached registration claims.

Claims (4)

A hydraulic cylinder by selectively supplying hydraulic oil through a hydraulic cylinder 30 for operating at least one jaw for gripping the pile and the first and second ports 32 and 33 installed in the hydraulic cylinder 30 A hydraulic oil supply unit 50 for gripping and releasing the pile by operating 30,
A pressure detection unit 61 for detecting the supply pressure of hydraulic oil when the pile 100 is gripped by the operation of the hydraulic cylinder 30 to detect whether the pile is normally gripped and the state of the gripping pressure for gripping the pile,
A display unit 70 that displays whether the gripping force is in a normal state by a signal detected by the pressure detection unit 61, and a hydraulic cylinder using the hydraulic oil supply unit 50 when the set detected pressure is less than the set pressure. 30) and a controller 62 for supplying hydraulic oil to increase the gripping force,
The piston 35 and the rod 31 of the hydraulic cylinder 30 further include an accumulator 40 for replenishing the pressure applied to the piston by hydraulic oil,
The accumulator 40 includes a hollow portion 41 formed at a predetermined depth toward the rod 31 on the piston 35, and a compression spring 42 and a pressure piston 43 inserted into the hollow portion 41,
The hydraulic oil supply unit 50 is connected to the first and second ports 32 and 33 of the hydraulic cylinder 30 to supply and return hydraulic oil to the first and second hydraulic pipes 51 and 52, It includes first and second check valves 56 and 58 installed in the first hydraulic pipe 51,
The first check valve 56 is connected by a second hydraulic pipe 52 and a pilot pipe 57 so that it can be operated by a return pressure acting on the second hydraulic pipe 52,
The pressure detection unit 61 is a hydraulic clamp device having a grip detection unit, characterized in that installed in the first hydraulic pipe (51) between the first and second check valves (56, 58).
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