JPS6157481B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention has a piston and a cylinder, and the piston and cylinder are capable of relative reciprocating motion, and either of the movable parts can be used as a tamping member. The present invention relates to a vibratory hydraulic exciter for a vibratory compaction machine arranged to be mounted.

(Prior Art) In this type of device, either a piston or a cylinder is configured to perform reciprocating motion or vibration motion relative to the other. Excitation devices whose reciprocating motion is performed along a straight line are sometimes called linear stroke motors.
motor). Excitation devices whose movement is oscillatory, on the other hand, are known as Oscillation piston motors or cylinder motors. Vibratory piston or cylinder motors are particularly useful for driving vibratory compactors of the Shaking or Joggling type.

Vibratory devices of the type described above generally have an inlet into the cylinder for introducing pressurized liquid fluid, which fluid is controlled by a valve located within the cylinder and actuated when the piston is at the end of its stroke relative to the cylinder. ing.

However, the above-mentioned valves were subject to excessive wear and were easily damaged, making them completely unusable. Furthermore, since such devices do not allow the stroke of the exciter to be varied, the power output of the exciter depends directly on the operating frequency, so that as the liquid supply pressure increases, the frequency and thereby the exciter The power output of the engine also increases, but it is impossible to control this.

(Problems to be Solved by the Invention) An object of the present invention is to eliminate the drawbacks of the vibration exciter as described above and to enable the power output of the exciter to be changed independently of the liquid fluid pressure. be.

Means for Solving the Problems The vibratory hydraulic exciter for a vibratory tamper according to the invention is capable of relative reciprocating motion and is arranged such that its movable part is attached to the tamping member. The excitation cylinder is connected by a flexible conduit to a source of pressurized liquid fluid in which liquid is reciprocated by the action of the source of pressurized liquid fluid.

The pressurized liquid fluid source consists of two pressure source cylinders each with a piston, which cylinders are driven by respective cranks mounted on one common crankshaft, but one of the two cylinders is One is disposed so as to be variable in direction around the axis of the crankshaft.

In the present invention, a pressure source cylinder having the same structure as these cylinders is disposed at a position facing each of the two pressure source cylinders each having a built-in piston in the pressurized liquid fluid source with the crank interposed therebetween. At the same time, these two cylinders are connected to another excitation cylinder provided at a position opposite to the tamping member of the excitation cylinder, so that the tamping member is tamped from both sides thereof. You can also do it.

(Operation) Since the outline of the structure of the device of the present invention is as described above, a valve braked by a piston is no longer necessary in the excitation cylinder. The above-mentioned problems due to valve wear are thus avoided.

Furthermore, since one of the two pressure source cylinders of the pressurized fluid source is disposed variably around a common crankshaft axis, this allows the movement of the piston in both cylinders to be controlled. It is possible to adjust the phase and thereby the amount of liquid fluid delivered per stroke and thus the relative working strokes of the excitation cylinder and excitation piston.

The frequency of the pressurized liquid fluid source can be changed,
This makes it possible to change the operating frequency in the excitation cylinder and also to change the period of relative reciprocating motion between the piston and the cylinder.

This structure of the pressurized liquid fluid source has the advantage that the output of the exciter can be smoothly adjusted. Both the stroke length of the exciter and the output losses of the exciter shall be varied between zero and maximum values in a manner that is free of hydro-dynamic losses and independent of the frequency of the exciter. I can do it. In contrast, in conventional exciter devices, the power output and the frequency can only be adjusted in a mutually dependent manner.

(Example) Hereinafter, an example of an excitation device according to the present invention shown in the accompanying drawings will be described.

For reference, FIG. 1 first shows an example of an excitation device comprising one pressurized liquid fluid source and one excitation cylinder.

In FIG. 1, the exciter device has an excitation cylinder 1 containing an excitation piston 2. A broken line 3 indicates the upper dead center position of the piston 2, and a broken line 4 indicates the lower dead center position of the piston 2. A piston rod 5 is attached to the piston 2, and the piston rod 5 is attached to a tamping member 6 in the shape of a diaphragm.

The vibrating cylinder 1 and the member carrying it, together with the vibrating piston 2, participate in the vibrations generated by the vibrating device, since the vibrating cylinder 1 is connected to the pressure source cylinder 7 by a flexible conduit 13; The pressure source cylinder does not vibrate. The pressure source cylinder 7 includes a pump piston 8 constituting a source of pressurized liquid fluid, which piston 8 is reciprocated by a drive crank 11 between an upper dead center position 9 and a lower dead center position 10. The same crank 11 has a connecting rod 12 and a piston 8
is connected to. The respective spaces above the pistons 2 and 8 in the cylinders 1 and 7 and the conduit 6 are filled with liquid fluid, and the piston 8 is at the top dead center position 9.
As the piston 2 rises in the direction, the pressure of the liquid fluid increases and the piston 2 descends toward the lower dead center position 4. Conversely, when the piston 8 moves back toward the lower dead center position 10, the pressure of the liquid fluid decreases, and the piston 2 is pulled toward the upper dead center position 3 and rises. The excitation piston 2, which is continuously rotated by the drive crank 11, thus performs a reciprocating movement within the excitation cylinder 1 and causes the tamping member 6 to vibrate.

FIG. 2 shows one embodiment of the device according to the invention. In this embodiment the pressurized liquid fluid source is constituted by two pressure source cylinders 17,21. That is, the excitation cylinder 14 including the excitation piston 15 corresponds to the excitation cylinder 1 in FIG.
It is connected to a first pressure source cylinder 17 corresponding to , and is connected by a second flexible conduit 26 to a second pressure source cylinder 21 having the same structure as the first pressure source cylinder 14 .

16 is a tamping member. Pressure source cylinder 17
and 21 are connecting rods 20 and 24, respectively, as shown in the figure.
the first and second pump pistons 18, 22 being driven by cranks 19, 23 with Ru. The cylindrical axis of the second pressure source cylinder 21 intersects the axis of the crankshaft 27, and the cylinder 21 is controlled by the movement of the pump piston 22 in the second pressure source cylinder 21 and the pump piston 1 in the first pressure source cylinder 17.
The crankshaft 27 is mounted in a variable direction around the axis of the crankshaft 27 so as to change the phase relationship with respect to the movement of the crankshaft 27. In FIG. 2, the cylinder 21
The cylindrical axis of is inclined at an angle α to the cylindrical axis of the cylinder 17. Angle α is 0
It can be changed arbitrarily from ゜ to 180゜.

The functions of the pressurized liquid source and the excitation cylinder in this embodiment are the same as those in the reference example shown in FIG. The pump pistons 18, 22 in the pressure source cylinders 17, 21 are therefore identical to each other in order to increase the stroke of the pistons in the excitation cylinder 14. If the two pump cylinders 18, 22 are operated in completely opposite phases, the excitation piston 15 in the excitation cylinder 14 will not move at all. The pressure source cylinder 21 can be adjusted to various intermediate positions between these extremes. Therefore, the excitation piston 1 in the excitation cylinder 14
5's power output can be smoothly adjusted between 0 and maximum depending on the piston stroke.

FIG. 3 shows a second embodiment of the device according to the invention. The device shown in this figure has two parts facing each other with a tamping member 16 in between.
A pair of excitation cylinders 14, 14' are provided, the sources of pressurized fluid comprising a pair of pressure source cylinders 17, 17' and 21, 21', respectively. The cylinders 17, 21 are connected to the excitation cylinder 14 by conduits 25, 26 as in the second case, and the cylinders 17', 21' are connected to the excitation cylinder 14 by conduits 25', 26.
is connected to the excitation cylinder 14' by.

The pump pistons 18, 18' of the pair of pressure source cylinders 17, 17' are driven by a common crank 19, and the pump pistons 18, 18' of the other pair of cylinders 2
The same applies to 1 and 21'. Therefore, the two drive cranks 19 and 23 share a common crankshaft 2.
7, and the cylinders 21, 21' are mounted so as to be variable in direction around the axis of the crankshaft 27, as in the case of FIG.
With this structure, the tamping member 16 is tamped from both directions. That is, this arrangement is a double acting configuration. However, the tamping member 1
6 vibrates in both directions with equal force apart from the effect of gravity on the member.

In the two embodiments shown in the figures, the excitation piston or excitation pistons are connected to the tamping member and the excitation cylinder is fixed, but this is reversed so that the piston is fixed and the excitation cylinder is fixed. It can also be structured to be connected to a tamping member.

(Effects of the Invention) In the pressurized liquid fluid source of the present invention, since the axial directions of the two pressure source cylinders are provided so as to be able to cross each other, it is possible to change the frequency of the pressurized liquid fluid source. This makes it possible to change the operating frequency in the excitation cylinder and also the period of its relative reciprocating movement between piston and cylinder.

Furthermore, by configuring the two pressure source cylinders in the pressurized fluid source as one set of cylinders, it is also possible to tamper one tamping member from both sides.

According to the invention, the exciter device can be of compact construction. It is therefore possible to mount a number of excitation devices in parallel to act on one tamping element, and to obtain a very large increase in the excitation force output. Further, in the excitation device according to the present invention, it is possible to construct an excitation unit including a plurality of excitation cylinders and pistons, as shown in the second embodiment shown in the drawings. The ability to assemble the exciter into this type of unit provides streamlined productivity and inventory economies.

[Brief explanation of the drawing]

FIG. 1 is a side view of one embodiment of the apparatus of the present invention, showing both an excitation cylinder including an excitation piston arranged like a linear stroke motor and a source of pressurized liquid fluid. FIG. 2 is a side view showing the first embodiment of the present invention, and this figure shows a pressure liquid source composed of two pressure source cylinders and a pump piston, and a single excitation cylinder and piston connected thereto. FIG. 3 is a side view of a second embodiment, which operates on a similar principle to the embodiment shown in FIG. ing. 1...Excitation cylinder, 2...Excitation piston, 3
...Top dead center position, 4...Bottom dead center position, 5...
Piston rod, 6... tamping member, 7... pressure source cylinder, 8... pump piston, 9... upper dead center position, 10... lower dead center position, 11... drive crank, 12... connecting rod , 13... conduit, 14,1
4'... Excitation cylinder, 15, 15'... Excitation piston, 16... Tamping member, 17, 17'... Pressure source cylinder, 18, 18'... Pump piston, 19... Drive crank, 20, 20'...Connecting rod, 21, 21'...Pressure source cylinder, 22,
22'... Pump piston, 23... Drive crank, 24, 24'... Connecting rod, 25, 25'... Conduit, 26, 26'... Conduit, 27... Crank shaft.

Claims (1)

[Claims] 1. Consists of an excitation cylinder 14 and an excitation piston 15 disposed in the cylinder 14, one of which is connected to a tamping member 16, and the piston makes a relative connection with the cylinder. a vibratory hydraulic exciter configured to transmit power to the tamping member when the tamping member is moved;
2 built-in first and second pressure source cylinders 17,
21 and flexible conduits 25 and 26 connecting one end of each pressure source cylinder 17 and 21 to one end of the excitation cylinder 14, the inside of which is filled with liquid fluid to move the excitation piston 15 into the excitation cylinder 14.
a source of pressurized liquid fluid for continuous relative back-and-forth movement relative to said first and second pump pistons 18, 22;
are driven by a crank mechanism consisting of respective cranks 19 and 23 disposed on one common crankshaft 27, and the first and second pump pistons 18 and 22
the pressure source cylinder 17 in order to adjust the phase relationship of the pressure source cylinder 17 and thereby the amount of liquid fluid supplied to the excitation cylinder 14 for each cycle and thus the momentum of the excitation piston 15 relative to the excitation cylinder. . 2 In the pressurized liquid fluid source, the first and second
At a position opposite to the respective cranks 19, 23 of the pressure source cylinders 17, 21,
Third and fourth pressure source cylinders 17' and 21' having the same structure as these cylinders are provided, and both pressure source cylinders 17' and 21' are connected to conduits 25' and 25'.
6' connects the tamping member 16 to an excitation cylinder 14' which is provided at a position opposite to the excitation cylinder 14, thereby ramming the tamping member 16 from both sides. A vibratory hydraulic excitation device for a vibratory compaction machine according to claim 1, which is adapted to be compactable.