JPS6129789Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a diesel pile hammer.

Figure 1 shows a conventional diesel pile hammer.

It has an anvil 2 set on top of a pile 1, and a cylinder 3 surrounds the outside.

The cylinder 3 is provided with a scavenging/exhausting hole 4 and a hook groove 5 at its upper part.

Furthermore, there is a piston 6 that slides up and down inside the cylinder 3, and the entire cylinder 3, including the cylinder 3, is supported by a support arm 8 from a guide 7.

The guide 7 has a lifting device 10 that moves up and down on the guide 7 with a rope 9, and the lifting device 10 is provided with a hook 12 whose tip can be hooked onto the collar 11 of the piston 6.

In FIG. 1, a lifting device 10 is
lower to the lower end of the hook groove 5 of the cylinder 3.

Next, the hook 12 is rotated and its tip is hooked onto the collar 11 of the stationary piston 6, and the lifting device 10 is raised by the rope 9 to lift the piston 6.

When the hook 12 reaches the upper end of the hook groove 5, the tip of the hook 12 is inserted into the collar 11 of the piston 6.
Remove from.

The piston 6, which has come off the hook 12, begins to fall.

When the falling piston 6 closes the scavenging/exhausting hole 4, the air trapped in the cylinder between the piston 6 and the anvil 2 begins to be compressed. Furthermore, the piston 6 falls, collides with the anvil 2, and causes the pile 1 to penetrate into the soil.

At the time of this collision, the piston 6 atomizes the fuel previously stored in the central recess of the anvil 2 by a fuel injection device (not shown).

The atomized fuel comes into contact with the compressed air at high pressure and high temperature, spontaneously ignites and burns, becoming further high pressure and high temperature working gas.

The piston 6 after colliding with the anvil 2 is pushed up by this high pressure working gas.

When the rising piston 6 opens the scavenging/exhausting hole 4, high-pressure exhaust begins, part of the working gas in the cylinder is exhausted to the atmosphere, and the pressure in the cylinder also decreases. Even after the pressure inside the cylinder drops to atmospheric pressure due to high-pressure exhaust, the piston 6 continues to rise due to the kinetic energy stored up to that point, so the pressure inside the cylinder falls below atmospheric pressure. As a result, new air begins to flow into the cylinder from the scavenging/exhausting hole 4.

The scavenging hole 4 is provided facing downward, and the fresh air that flows in replaces the residual gas in the cylinder between the scavenging hole 4 and the anvil 2, reducing the amount of fresh air that can be used for the next cycle of combustion. I do a lot of things.

Further, when the piston 6 rises, the hook groove 5 provided in the cylinder 3 also opens, and fresh air flows into the cylinder here as well.

After the piston 6 rises to the highest point (top dead center), it begins to fall again to operate the next cycle.

As a result, the above-described cycle is repeated until the fuel supply is stopped, and the piston 6 continues to collide with the anvil 2, causing the pile 1 to penetrate into the soil.

FIG. 2 shows the flow of working gas into and out of the cylinder during the upward stroke of the piston 6.

When the scavenging/exhausting hole 4 opens, high-pressure exhaust begins, and when the piston 6 further rises and the cylinder internal pressure falls below atmospheric pressure, fresh air begins to flow into the cylinder.

The inflow speed of fresh air approximately corresponds to the rising speed of the piston 6, but when the hook groove 5 also opens due to the subsequent rise of the piston, fresh air also flows from there.

As shown in FIG. 3, the hook groove 5 opens at the top of the cylinder 3, and its area is 15 to 20 times larger than the scavenging hole. Therefore, when the hook groove 5 begins to open, the inflow velocity of fresh air from the scavenging hole 4 rapidly decreases as shown by the dotted line in FIG. The inflow of fresh air increases.

The fresh air flowing in from the hook groove 5 does not replace the gas remaining in the cylinder between the scavenging hole 4 and the anvil 2.

As a result, the amount of fresh air between the scavenging and exhaust hole 4 and the anvil 2 necessary for the next cycle is insufficient, resulting in deterioration of combustion and the generation of a large amount of smoke, causing a pollution problem.

Therefore, the present invention aims to eliminate the above-mentioned drawbacks, increase the amount of fresh air between the scavenging hole and the anvil, improve combustion, and provide a diesel pile hammer that generates smoke. . Its unique feature is that it has a lid that can be slid up and down that closes the entire surface of the hook groove, and when the lifting device is lowered to the bottom end of the hook groove when the diesel pile hammer is started, it is driven by the bottom end of the lifting device. It is equipped with a lid lifting means using a hydraulic device or a link mechanism. This opens a portion of the lower end of the hook groove, and the hook engages the collar of the piston through the opening.

The lifting device is raised as it is, the piston is lifted together with the lid, and the diesel pile hammer is activated.At this time, the lid is detached from the hook together with the piston and falls, closing the entire surface of the hook groove.

Therefore, during the subsequent operation of the piston, the lid closes the entire surface of the hook groove, increasing the amount of fresh air and improving combustion.

Embodiments of the present invention will be described in detail below with reference to the drawings.

Fig. 4 shows the upper structure of the diesel pile hammer of the present invention.
3 and its guide 14 are provided.

A stopper 1 is placed under the hook groove 5 of the cylinder 3.
5, and a protrusion 16 is provided at the lower end of the lid 13 as shown in FIG.

Furthermore, a piston 17 that contacts the protrusion 16 of the lid 13 and a drive piston 19 that communicates with the piston 17 via hydraulic oil 18 are provided. The drive piston 19 is pushed up from below by the upward force of a spring 20.

Further, the piston 17 and the driving piston 19 are attached to a support base 21 provided on the cylinder 3, and the driving piston 19 shown in FIG. 4 is in a position where it is pushed down by the lower end of the lifting device 10.

A cross section of FIG. 4 is shown in FIG. 6.

The lid 13 can be slid up and down along a guide 14.

In FIG. 5, the lid is supported by the stopper 15 at the same time as the piston 17 is pushed down by the protrusion 16 by its own weight.

Here, the drive piston 19 is pushed up by the upward force of the spring 20 and the hydraulic pressure generated when the piston 17 is pushed down by the lid 13.

At this time, as shown in FIG. 4, the lifting device 10 is lowered to the lower end of the hook groove 5 by the rope 9. The drive piston 19 is pushed down by the lower end of the lifting device 10, and the hydraulic oil 18 becomes under high pressure. As a result, the piston 17 is pushed up, and the protrusion 1
6, the lid 13 rises above the lower end of the hook groove 5, creating an opening.

Then, when the hook 12 is rotated, the hook 12 first hooks onto the lower end of the lid 13 due to the above-mentioned opening.
As the hook 12 rotates, the lid 13 is pushed upward along the guide 14, and its tip can be hooked onto the collar 11 of the piston 6.

The lifting device 10 is then raised using the rope 9, and the piston 6 is moved together with the lid 13 into the hook groove 5.
After lifting the hook 12 to the upper end, remove the tip of the hook 12 from the collar 11 of the piston 6.

The piston 6 that has come off the hook 12 begins to fall and operates through the same stroke as a conventional diesel pile hammer.

At this time, the lid 13 also comes off the hook 12 and falls, and the piston 17 is pushed down by the protrusion 16 and collides with the stopper 15 and stops.

As a result, the drive piston 19 is pushed up by the upward force of the spring 20 and the hydraulic pressure generated when the piston 17 is pushed down.

As described in the previous section, the piston 6, which has undergone the same stroke as the conventional diesel pile hammer and opened the scavenging/exhausting hole 4, allows fresh air to flow in from the scavenging/exhausting hole 4 after exhausting at high pressure.

Even if the piston 6 further rises and reaches the hook groove 5, the hook groove 5 is covered by the lid 13 in the present invention, as shown in FIG.

As a result, the inflow of fresh air from the hook groove 5 is eliminated, and all the fresh air inflow from the hook groove 5 in the conventional diesel pile hammer shown in section A in FIG. I will do it.

As a result, the amount of fresh air that replaces residual gas within the scavenging hole 4 and the cylinder of the anvil 2 increases, improving combustion and eliminating smoke generation.

In the first embodiment, a piston 17 and a driving piston 19 are used to open the lid 13 at the lower end of the lifting device 10.
In the second embodiment, the lid 13 is opened using a mechanical link mechanism.

Figure 7 shows its structure.

A vertically slidable piston 22 in contact with the protrusion 16 of the lid 13 is supported by a piston guide 23 from the cylinder 3.

The lower end of the piston 22 is connected to a link 24,
The link 24 is connected to a lever 26 supported by a fulcrum 25 attached to the support base 21.

Furthermore, a roller 27 is provided at the tip of the lever 26.

In FIG. 7, the lid 13 is moved to the protrusion 1 due to its own weight.
6 to push down the piston 22, and at the same time it is supported by the stopper 15.

Therefore, the roller 27 is pushed up through the link 24.

At this time, as shown in FIG. 8, when the lifting device 10 is lowered to the lower end of the hook groove 5, the lifting device 1
The roller 27 is pushed down by the lower end of 0, and the piston 22 is pushed up through the link 24.

As a result, the lid 13 is raised above the lower end of the hook groove 5 through the protrusion 16, creating an opening.

Thereafter, the same operation as in the first embodiment is performed.

The entire surface of the hook groove 5 is closed with a lid 13, and the same effect as in the first embodiment is obtained.

According to the present invention, the piston is lifted from the outside of the cylinder to the collar provided on the piston sliding in the cylinder through the hook groove opened in the longitudinal direction of the cylinder side wall. In a diesel pile hammer that is started by pulling the piston upward by pulling the hook of the device and removing the hook, a lid that can be slid up and down via a guide is provided in the hook groove,
When the hook of the piston lifting device is hooked to the collar, a lid lifting means consisting of hydraulic pressure or a link mechanism operated by the weight of the piston lifting device is equipped, and the lid is slightly lifted and opened by the means. By making it easier to hook the hook onto the collar and opening the hook groove temporarily only during startup, the amount of fresh air between the scavenging hole and the anvil increases, improving combustion and reducing smoke. This is useful in practice.

[Brief explanation of drawings]

Fig. 1 is a side view of a conventional diesel pile hammer, Fig. 2 is an explanatory diagram showing the working gas inflow and outflow speed, Fig. 3 is a front view of its hook groove, and Fig. 4 is a first embodiment of the present invention. 5 is a front view of the hook groove, and FIG. 6 is a side view showing the hook groove.
A sectional view, FIG. 7 is a side view of main parts showing the second embodiment,
FIG. 8 is a side view showing its operating condition. 2...Anvil, 3...Cylinder, 4...Scavenging and exhaust hole, 5...Hook groove, 6...Piston, 7...
... Guide, 9 ... Rope, 10 ... Lifting device,
11...Color, 12...Hook, 13...Lid,
14...Guide, 15...Stopper, 16...
Projection portion 17...Piston, 19...Drive piston, 20...Spring, 21...Support stand.

Claims (1)

[Scope of utility model registration request] A hook of a piston lifting device provided parallel to the cylinder is pulled from outside the cylinder onto a collar provided on the piston sliding inside the cylinder through a hook groove opened in the longitudinal direction of the cylinder side wall. In the diesel pile hammer, which is started by lifting the piston upward and removing the hook, the hook groove is provided with a lid that can slide up and down via a guide, and the hook of the piston lifting device is pulled to the collar. When hanging, a lid lifting means consisting of hydraulic pressure or a link mechanism operated by the weight of the piston lifting device is equipped, and the lid is slightly lifted and opened by the means, making it easier to hook the hook to the collar. A diesel pile hammer characterized in that a hook groove is temporarily opened only when starting.