KR100267211B1 - Hydraulic circuit of a pile drive - Google Patents

Abstract

PURPOSE: A hydraulic circuit of a pile drive is provided to simplify and enhance the performance and stability of the circuit by kinetically connecting a high pressure accumulator, a low pressure accumulator and a hydraulic cylinder by a logic manifold. CONSTITUTION: The hydraulic circuit comprises a high pressure accumulator(180) for storing high pressure from a hydraulic pump(140), a low pressure accumulator(181) for storing low pressure and separated from the high pressure accumulator(180), and a hydraulic cylinder(190) lifting a piston rod having a ram in accordance with hydraulic lines to the accumulators(180,181). The passages(176,172) of the accumulators(180,181) are respectively connected to the hydraulic cylinder(190) so that they are controlled by the first logic valve(160) and the second logic valve(161). Further, a logic manifold(170) having a cylinder block(173) is installed.

Description

Hydraulic Circuit of Driving

The present invention relates to a hydraulic circuit of a driving machine, and more particularly, to control the valves and a double cylinder in a block body having a hydraulic passage to manifold to minimize the pressure loss and increase the mechanical efficiency. It is invented to reduce the cause of failure due to acupressure, and to improve the maintenance and assembly and productivity.

In general, a navigator is a device that attaches a pile to the ground by attaching it to a crane or an excavator, and is classified into a diesel type and a hydraulic type.

Diesel type has been widely used as a target of civil complaints as the main cause of environmental pollution due to the severe explosion and soot smoke. Recently, environmentally friendly hydraulic type is mainly used.

The hydraulic driving machine delivers the hydraulic pressure supplied from the hydraulic supply device (1) to the driving body through hydraulic hoses and pipes, thereby transferring the ram (3) by the hydraulic cylinder (2). Equipment to type the pile on the ground by striking the pile with the kinetic energy obtained by raising and falling. The general circuit is as shown in FIG.

That is, the ram (3) is fixed to the piston rod (2a) of the hydraulic cylinder (2) assembled in the main body of the driving machine provided separately from the hydraulic supply device (1), the ram (3) by the vertical operation of the piston rod (2a) This is to reciprocate up and down.

The high pressure hydraulic oil generated by the hydraulic pump 4 is stored in the high pressure accumulator 6 through the first line 5, and the pilot pressure passing through the pressure reducing valve 7 is stored in the pilot accumulator 12. At this time, when the predetermined set pressure is reached, the relief valve 9 returns more than necessary flow rate to the hydraulic oil tank 10 to maintain stability in the hydraulic circuit.

The raising operation of the ram 3 in the conventional hydraulic circuit having such a circuit is;

When the power is applied to the hammer control valve 11 by turning on the operation switch, the pilot pressure stored in the pilot accumulator 12 switches the spool of the hammer control valve 11 to the operating position P b. Accordingly, the high pressure hydraulic oil discharged from the hydraulic pump 4 and the high pressure hydraulic oil stored in the high pressure accumulator 6 are instantaneously discharged, that is, the high pressure through the operation position P b port of the hammer control valve 11 spool. Is supplied to the lower portion of the hydraulic cylinder (2) via the PA port which is the operating position of the spool valve (14), the ram (3) starts the ascending operation.

At this time, the low pressure hydraulic oil flowing out to the T side of the hydraulic cylinder 2 returns to the hydraulic oil tank 10 through the cracking pressure of the check valve 15.

On the other hand, the power applied to the hammer control valve 11 is the power is cut off by the timer set time of the controller 17, the ?? The spool of the hammer control valve 11 is switched between P a and b T, and the high pressure hydraulic oil passing from the hydraulic pump 4 through the first line 5 passes through the pilot line to the spool of the spool valve 14 to BT. The high pressure hydraulic fluid which has switched to stop the rise of the ram 3 and raises the ram 3 is accumulated in the high pressure accumulator 6, and the flow rate remaining and accumulated in the high pressure accumulator 6 is the relief valve 9 It is discharged to the hydraulic oil tank (10) through.

Next, the lowering operation of the ram 3 will be described;

The hydraulic oil on the left side of the spool valve 14 returns to the hydraulic oil tank 10 via the port B T of the hammer control valve 11. On the other hand, the hydraulic fluid in the lower part of the hydraulic cylinder 2 flows into the T port of the hydraulic cylinder 2 via the BT port of the spool valve 14 by the self-weight of the ram 3 which has stopped rising. (2) phase. The negative pressure in the upper portion of the hydraulic cylinder 2 due to the difference in the volume of the hydraulic oil underneath is offset by the supply of the low pressure hydraulic oil stored in the low pressure accumulator 8, and the flow remaining again in this process is checked valve 15. When the cracking pressure is exceeded, it returns to the hydraulic oil tank 10 via the second line 16 and the check valve 15 again.

In this way, the freely dropped RAM 3 hits the pile and infiltrates the pile into the ground. In addition, the sensor 18 detects the fall of the ram 3 to operate the timer of the controller 17 to reconnect the power to the hammer control valve 11 to restart the ascending operation. Therefore, the file rolling operation is automatically performed by repeating the operation as described above. Here, the hydraulic cylinder (2) connecting the circuit from the hydraulic supply device (1), the low pressure accumulator (8) and the high pressure accumulator (6), and various valves (11, 14) for controlling the hydraulic hammer are each The circuits were configured to be connected to each other by hoses or pipes at each separated location.

Conventional pile driving hydraulic circuit configured as described above has the following problems.

First, since the hammer control valve 11 is installed in the hydraulic supply device 1 and the pilot pressure for operating the ram 3 must pass through the third line 13, the pulsation generated when the hammer control valve 11 is switched. The first line 5, the second line 16, and the third line 13 vibrate violently due to pressure.

Second, since the three first line 5, the second line 16, and the third line 13 must be installed respectively, the structure is complicated by the increase in the number of parts, and the cost increases.

Third, there was a problem that a lot of pressure loss occurs when the pilot pressure passes through the third line (13).

Fourth, since the pressure reducing valve (7), the pilot accumulator (12), and the hammer control valve (11) are respectively installed in the hydraulic pressure supply device (1), the pressure loss due to the flow through resistance in each component is high, and heat generation accordingly occurs. There was a problem of falling efficiency.

Fifth, there is a problem that the operation time of the ram 3 is delayed due to the use of the slow response speed spool valve (14).

Sixth, the hydraulic cylinder (2), the low pressure accumulator (8) and the high pressure accumulator (6), and various valves (11, 14) for controlling the hydraulic circuit are fixedly installed in separate positions, and they are attached to the hose or pipe. By connecting the circuits, the durability and stability of the parts are lowered, and in particular, the allowable breakdown voltage is not sufficient, which places a lot of restrictions on the capacity.

SUMMARY OF THE INVENTION An object of the present invention is to provide a hydraulic circuit of a driving machine which can reduce the number of parts and can be simply manufactured at a lower cost.

Another object of the present invention is to provide a hydraulic circuit of a driving machine that can reduce pressure loss and vibration in a hose and increase its efficiency by increasing a response speed.

Still another object of the present invention is to provide a hydraulic circuit of anti-taking that can improve durability, stability and overall performance.

1 is a main part device of the present invention.

2 is a hydraulic circuit diagram of a conventional cruiser.

Figure 3 is a circuit diagram of the stop state before the start of operation of the step-by-step operating circuit of the present invention.

Figure 4 is a circuit diagram of the initial rising stroke state of the step-by-step operating circuit diagram of the present invention.

Figure 5 is a circuit diagram of the stop signal state of the step-by-step operating circuit diagram of the present invention.

6 is a circuit diagram of an overrun state in a step-by-step operating circuit diagram of the present invention.

Figure 7 is a circuit diagram of the downstroke state of the step-by-step operating circuit diagram of the present invention.

8 is a circuit diagram of a driving state of the step-by-step operating circuit diagram of the present invention.

9 is a circuit diagram of a continuous operation state of the step-by-step operating circuit diagram of the present invention.

* Explanation of symbols for main parts of the drawings

100: file 110: operation sensor

120: controller 130, 130a: hydraulic oil tank

140: hydraulic pump 150: hammer control valve

160: first logic valve 160p: poppet of the first logic valve

161: second logic valve 161p: poppet of the second logic valve

170: logic manifold 171: supply passage

171a: discharge passage 172: low pressure passage

173: Cylinder block 174: Pilot passage A

175: Pilot passage B 176: High pressure passage

177: return passage 180: high pressure accumulator

181: low pressure accumulator 190: hydraulic cylinder

191: outer cylinder 192: inner cylinder

193: Piston 194: Piston Rod

200: ram

An object of the present invention, the high pressure accumulator 180 for storing the high pressure generated from the hydraulic pump 140 and the low pressure accumulator 181 for storing the low pressure in a position separated from the high pressure accumulator 180 and the high pressure accumulator 180 And a hydraulic cylinder (190) for vertically moving the piston rod (194) on which the ram (200) is mounted according to the setting of the hydraulic line supplied to the low pressure accumulator (181);

The high pressure accumulator 180 and the low pressure accumulator 181 have a high pressure passage 176, a low pressure passage 172, and a hydraulic cylinder so that the passage is controlled by the first logic valve 160 and the second logic valve 161. Each of which is installed in communication with each other, but is provided in a logic manifold 170 having a cylinder block 173 on the outside thereof.

Thus, the high pressure accumulator 180, the low pressure accumulator 181, and the hydraulic cylinder 190 have a logic manifold in which a supply passage 171, a low pressure passage 172, a high pressure passage 176, and a return passage 177 are formed therein. Since it is mechanically connected to the fold 170, the installation is stable, and the allowable breakdown voltage is increased, so that the overall performance is improved.

In addition, since the number of parts is reduced and the overall structure is simple, mass production is possible at a low price.

Hereinafter, detailed operations and embodiments of the present invention will be described with reference to the accompanying drawings.

2 shows a hydraulic circuit of a conventional cruiser.

1 is a main device diagram of an anti-ride hydraulic circuit of the present invention, wherein the high pressure accumulator 180, the low pressure accumulator 181, and the hydraulic cylinder 190 are mechanically connected to the logic manifold 170. A device in which a hydraulic circuit is formed by a passage formed in 170 is shown.

That is, in the present invention, as shown in FIG. 1, the hydraulic pump 140 is installed in the hydraulic oil tank 130 so that high pressure hydraulic oil is connected to a port to which the high pressure accumulator 180 of the logic manifold 170 is connected. .

On the other hand, the low pressure accumulator 181 is connected to the logic manifold 170 at the other side of the high pressure accumulator 180, and the supply passage 171 and the discharge passage communicating across the logic manifold 170 to different positions. 171a is connected in communication with each other.

The first logic valve 160 and the second logic valve 161 are installed in the logic manifold 170 at the boundary between the supply passage 171 and the discharge passage 171a to open and close the flow of the hydraulic oil. do.

On the other hand, the hydraulic cylinder 190 penetrates to the center side of the logic manifold 170.

The hydraulic cylinder 190 has a double structure of the outer cylinder 191 on the outside and the inner cylinder 192 on the inside, and the piston rod 194 is installed in the inner cylinder 192 to enable the vertical reciprocating movement The ram 200 is mounted at the end of the piston rod 194, and the ram 200 is reciprocated up and down when the piston rod 194 is reciprocated up and down by the control of the hydraulic circuit. By hitting the file 100 to be typed on the ground.

Hereinafter, the hydraulic circuit of the present invention will be described by dividing each step.

One of the features of the present invention is that the high pressure is always applied to the left side 160b of the first logic valve 160 except when the hydraulic hammer is in a stopped state in each of the following steps.

First, Figure 3 shows that the hydraulic hammer is at rest;

The ram 200 is in a stopped state, and the high pressure accumulator 180 and the low pressure accumulator 181 have no hydraulic pressure, and the hammer control valve 150 has no voltage applied thereto, so the spool is in a neutral state. Therefore, the hydraulic pilot path is connected to P A port and B T port. At this time, the high pressure hydraulic oil generated in the hydraulic pump 140 is circulated only inside the hydraulic supply device (not shown) and immediately returns to the hydraulic oil tank 130. The first logic valve 160 and the second logic valve 161 are closed by the force of the spring. Will be in a state.

Next, FIG. 4 shows a state in which the ram 200 starts an ascending stroke for the first time by operating a hydraulic hammer;

When a voltage is applied to the hammer control valve 150 by operating the operation switch of the controller 120 to raise the ram 200, the spool is switched to the P B port and the A T port, which are operating positions.

Accordingly, since the right side 160pi of the first logic valve 160 is opened to the hydraulic oil tank 130a through the AT port of the pilot passage A 174 and the hammer control valve 150, the pressure becomes low. On the left side 160b and the right side 160pi of the logic valve 160, the poppet 160p moves to the right side due to the pressure difference, and the supply passage 171 is opened so that the first logic valve 160 opens. ?? state. Due to this, the high-pressure hydraulic oil generated from the hydraulic pump 140 acts on the lower end of the hydraulic cylinder 190 via the first logical valve 160 and the supply passage 171 to attach the ram 200 to the piston rod 194. ) Raises the piston (193) connected.

In addition, the high-pressure hydraulic oil generated from the hydraulic pump 140 passes through the pilot passage B 175 through the PB port of the hammer control valve 150 to act on the left side (161pi) of the second logic valve 161 at the same time. . At this time, the hydraulic pressure from the first logic valve 160 passing through the discharge passage 171a of the logic manifold 170 acts on the right passage 161a. The right passage 161a of the second logic valve 161 has the same pressure as compared to the left side 161pi, but the poppet 161p of the second logic valve 161 is pushed to the right because its pressure area is small. To keep it closed.

On the other hand, the hydraulic fluid in the upper side of the hydraulic cylinder 190 is accumulated in the low pressure accumulator 181 through the outer passage and the low pressure passage 172 of the hydraulic cylinder 190 due to the upward stroke of the piston 193, The flow rate is returned to the hydraulic oil tank 130.

Next, FIG. 5 is a description of a state in which the rising stop signal is activated by a timer not shown in the controller 120;

When the voltage applied to the hammer control valve 150 is cut off by the set time of the timer (not shown) by the controller 120, the spool of the hammer control valve 150 is returned to the neutral state by the restoring force of the spring again, and the PA It is connected to the port and BT port. Accordingly, the right side 160pi of the first logic valve 160 is changed to a high pressure, and the pressure is equal to the left side 160b of the first logic valve 160. At this time, the poppet (160p) is moved to the left again by the difference in the hydraulic pressure area of the right (160pi) and the left (160b) to block the supply passage 171, the first logic valve 160 is closed? It becomes the state. Therefore, the high pressure hydraulic oil that raised the ram 200 is cut off by the first logic valve 160, and the high pressure hydraulic oil supplied from the hydraulic pump 140 is no longer supplied to the hydraulic cylinder 190. Accumulation is started on the high pressure accumulator 180.

At the same time, the high pressure acting on the left side (161pi) of the second logic valve 161 is connected to the hydraulic oil tank 130a side through the BT port of the pilot passage B 175 and the hammer control valve 150, and changes to low pressure. The lower portion of the hydraulic cylinder 190 is changed to low pressure due to the blocking of the first logic valve 160, but maintains a pressure slightly higher than the hydraulic oil tank (130a) side. Therefore, the left 161pi and the right 161b move the poppet 161p of the second logic valve 161 back to the left 161pi due to the pressure difference, so that the discharge passage 171a communicating with the hydraulic cylinder 190 is provided. Open to an open state.

Next, FIG. 6 is a description of the action until the run up of the ram 200 is stopped by overrun by the inertia force of the ram 200;

As described above, even when the hydraulic pressure that raises the ram 200 is cut off because the power of the hammer control valve 150 is switched off so that the first logic valve 160 and the second logic valve 161 are switched, the ram 200 remains inertial force. As a result, some upward stroke is continued until the speed is offset by gravity acceleration and pressure loss. At this time, since the hydraulic pressure supplied to the lower portion of the hydraulic cylinder 190 is blocked by the first logic valve 160, the lower end of the hydraulic cylinder 190 rapidly changes to negative pressure. At this time, since the second logic valve 161 is in the ?? open state, the hydraulic pressure accumulated in the low pressure accumulator 181 is discharged, and the discharge passage communicating with the lower portion of the second logic valve 161 and the hydraulic cylinder 190 ( A shortage flow rate is supplied to the lower portion of the hydraulic cylinder 190 via 171a to stabilize the circuit.

Next, Figure 7 is a description of the action while the ram 200 is lowered stroke by its own weight;

As the ram 200 stops rising and starts free fall by its own weight, the downstroke begins.

Since the hydraulic pressure of the lower portion of the hydraulic cylinder 190 is the second logical valve 161 is opened, the discharge passage 171a and the second logical valve 161 and the low pressure passage 172 communicating with the hydraulic cylinder 190 are provided. And through the outer passage of the hydraulic cylinder 190 is moved to the upper portion of the hydraulic cylinder 190. At this time, the upper portion of the hydraulic cylinder 190 is on the piston (193). Since the volume is larger than the lower portion due to the cross-sectional area of the lower portion, only the flow rate supplied from the lower portion of the hydraulic cylinder 190 is insufficient, thereby rapidly changing to negative pressure. In order to prevent this phenomenon, the low pressure accumulator 181 discharges the hydraulic oil accumulated during the upstroke from the downstroke and refills the upper portion of the hydraulic cylinder 190 via the outer passage of the low pressure passage 172 and the hydraulic cylinder 190. By canceling the above negative pressure, the stability of the hydraulic circuit is maintained.

Next, FIG. 8 is a description of the moment when the ram 200 descends and drives the pile 100;

The ram 200 hits a drive cap (not shown) covered with the tip of the pile 100 by free fall due to the acceleration of gravity, and types the pile 100 on the ground as the impact energy. At this time, since the hydraulic pressure accumulated in the low pressure accumulator 181 is mostly exhausted, and the piston rod 194 for mounting the ram 200 is no longer lowered below the hydraulic cylinder 190, the hydraulic cylinder 190 is no longer lowered. costume. There is almost no flow of hydraulic pressure in the lower portion, the hydraulic pressure of the low pressure passage 172 is gradually moved to the hydraulic oil tank (130a) side, the high-pressure hydraulic oil supplied from the hydraulic pump 140 up to this time to accumulate the pressure in the high pressure accumulator 180 Will continue.

Next, FIG. 9 illustrates a process in which the RAM 200 starts rising again to perform continuous work;

Immediately before the ram 200 falls freely and drives the pile 100, the lowering of the ram 200 is detected by the operation sensor 110, and the signal detected by the operation sensor 110 is detected by the controller 120. The timer (not shown) is built in, and the voltage is applied to the hammer control valve 150 again by the timer to switch the spool of the hammer control valve 150 to the operation positions PB and AT. At this time, the high pressure acting on the right side 160pi of the first logic valve 160 is connected to the hydraulic oil tank 130a through the AT port of the pilot passage A 174 and the hammer control valve 150 so as to change to a low pressure. To the left of the poppet 160p. The poppet 160p moves to the right due to the pressure difference of the right side 160pi and 160b so that the first logic valve 160 is in the ?? open state and at the same time the left side 161pi of the second logic valve 161. The high pressure is transmitted through the PB port and the pilot passage B 175 of the hammer control valve 150 to change the high pressure, the left side of the poppet (161p). The pressures on the right 161pi and 161a are equal. As a result, the poppet 161p of the second logic valve 161 is also moved to the right due to the difference in the hydraulic pressure areas, and the second logic valve 161 is brought into the closed state. On the other hand, the high pressure hydraulic fluid supplied to the high pressure accumulator 180 and the high pressure hydraulic oil supplied from the hydraulic pump 140 are joined at the left side 160b of the first logic valve 160 to pass through the supply passage 171 to the hydraulic cylinder. It is transmitted to the lower portion of the 190 and the rising stroke of the ram 200 is started again. At this time, since the flow rate discharged from the high pressure accumulator 180 is added to the flow rate supplied from the hydraulic pump 140, the ram 200 becomes faster than the initial rising speed. On the other hand, the action of the low pressure accumulator 181 and the upper portion of the hydraulic cylinder 190 forms the same process as the first stroke of the ram 200, and proceeds the automatic operation while repeatedly repeating this process.

Meanwhile, a seal housing 178 is connected to the logic manifold 170 to prevent leakage of the coupling portion of the piston rod 194.

In addition, the pilot passage A 174 and the pilot passage B 175 for the circuit connecting the first and second logic valves 160 and 161 and the hammer control valve 150 to the outside of the logic manifold 170. Is coupled to the cylinder block 173.

According to the present invention as described above, since the high pressure accumulator 180 and the low pressure accumulator 181 and the hydraulic cylinder 190 are mechanically coupled by the logic manifold 170, the circuit is simplified and the allowable breakdown voltage is increased. Overall performance and stability are improved.

In addition, since the pipelines between the circuits are short and blocked, the response speed of the circuits is fast and the workability and efficiency by shortening the operating time of the RAM 200 are very useful.

Claims (5)

A high pressure accumulator 180 for storing high pressure generated from the hydraulic pump 140 and a low pressure accumulator 181 for storing low pressure at a position separated from the high pressure accumulator 180 and the high pressure accumulator 180 and a low pressure accumulator 181. In the hydraulic device having a hydraulic cylinder 190 for vertically moving the piston rod (194) for mounting the ram 200 in accordance with the setting of the hydraulic line supplied to the; The high pressure accumulator 180 and the low pressure accumulator 181 have a high pressure passage 176, a low pressure passage 172, and a hydraulic cylinder so that the passage is controlled by the first logic valve 160 and the second logic valve 161. Each of them in communication with each other. Hydraulic circuit of a driving ride, characterized in that installed in the logic manifold (170) having a cylinder block (173) on the outside. The method of claim 1, wherein the first logic valve 160 supplies a high pressure passage 176 for supplying a high pressure hydraulic oil to the logic manifold 170, and a supply for supplying a high pressure hydraulic oil under the hydraulic cylinder 190. Hydraulic passage of claim 1, characterized in that the passage 171 and the high-pressure accumulator (180) to communicate with each other and installed at the point where the sum. The method of claim 1, wherein the second logic valve 161 is a low pressure passage 172 for discharging or replenishing a low pressure hydraulic oil from the upper portion of the hydraulic cylinder 190, and the hydraulic oil tank (130a) in the logic manifold 170 A return passage 177 for returning the hydraulic oil to the furnace and a discharge passage 171a for discharging the hydraulic oil discharged from the lower portion of the hydraulic cylinder 190 to the logic manifold 170, respectively. 177) and the low pressure accumulator (181) is connected to the low pressure cylinder 172 and the discharge passage (171a) so as to communicate with the hydraulic circuit of the ride, characterized in that installed at the point. The method of claim 1, wherein the hydraulic cylinder 190 has an outer cylinder 191 and the inner cylinder 192 of a dual structure, the outer cylinder 191 is a low pressure passage 172 and the inner cylinder 192 is a high pressure Hydraulic passage of the ride, characterized in that installed in communication with the passage 176, respectively. The method of claim 1, wherein the cylinder block 173 is a pilot passage A (174) and pilot to form a hydraulic circuit between the hammer control valve 150 and the first and second logic valves 160, 161 The hydraulic circuit of the cruiser, characterized in that each passage B (175) is installed.