JPS6012268B2 - Crawler tension adjustment and shock absorbing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a twill tension adjustment and damping device.

A conventional crawler track tension adjustment and shock absorbing device will be explained with reference to Figs. 1 and 2. In Fig. 1, a shows a car body, b shows a track frame attached to the car body a, and c shows a sprocket attached to one end of the track frame b. , e in Figures 1 and 2 is a crawler track tension adjustment and shock absorbing device, which includes a cylinder e fixed to the track frame b, a piston e2, a pressure chamber e3 behind the piston e2, and a grease supply hole e4. The spring receiver e5 and rod e6 fixed to the piston e2, the protective tube e7 fixed to the spring receiver e5, the nut e8 screwed to the tip of the rod e6, the rod e6, and the protective tube e7 are connected to each other. A stopper e fixed to the same spring receiver e9 as the spring receiver e9 and played on the rod e6.
,.

and a compression spring e interposed between the spring receivers e5 and e9,
．． It is composed of. Further, d is an idler attached to the spring receiver e9 via arm d, f is a crawler track suspended between the idler d and the sprocket c, and g
is a guide roller that supplies grease or hydraulic oil from the grease supply hole e4 to the cylinder e. the piston e2 spring receiver e5 protection tube e70 rod e6 spring receiver e9 arm d and idler d are moved to the left to adjust the initial tension of the crawler track f. If an impact of more than a certain value is applied to the idler d arm d, spring receiver e9
Stopper e,. is the compression spring e, . It is designed to move to the right against the pressure and cushion the impact. In construction machinery such as hydraulic power shovels and mining machinery such as traveling stackers, as the wheels themselves become larger, it is required that the initial tension of the track and the starting load of the buffer work be kept constant and automatically at all times. However, the crawler tension adjustment and shock absorbing device shown in Figures 1 and 2 has the problem that the above requirements cannot be met because the initial tension of the crawler track and the shock absorbing start load have to be set artificially. Ta.

The present invention addresses the aforementioned problems and includes: a cylinder having a piston supporting an idler and a floating piston;
A pressure source installed in a pipe connecting the hydraulic power source of the main system and the idler movement start setting pressure chamber of the cylinder behind the floating piston so as to store a constant pressure through a pressure reducing valve and a check valve behind it; and a pressure reducer provided in another pipe connecting the pipe between the pressure reducing valve and the check valve and the pressure chamber for initial tension of the cylinder between each piston. The purpose of the crawler tension adjustment and buffering device is to provide an improved crawler tension adjustment and buffer bag recorder that can automatically maintain the initial tension of the crawler track and the buffering start load at a constant level. The point is that it provides The crawler track tension adjustment and shock absorbing device of the present invention includes, as described above, a cylinder having a piston for supporting an idler and a floating piston, a hydraulic power source of the main system, and a pressure chamber for setting the start of movement of the idler in the cylinder behind the floating piston. a pressure source provided to store a constant pressure through a pressure reducing valve and a check valve behind the pressure reducing valve in the piping connecting the piping, and a cylinder between the piping between the pressure reducing valve and the check valve and each of the pistons. Since it is equipped with a pressure reducer installed in a separate pipe connecting the initial tension pressure chamber, the initial tension of the abdominal band and the buffer operation start load can be automatically maintained constant at all times.

Next, the crawler tension adjustment and shock absorbing device of the present invention will be explained with reference to an embodiment shown in FIG. Pressure reducing valve, 4 is check valve, 5 is accumulator (pressure source), 6
a, 6b are cylinders, 7a, 7b are floating pistons, 8a
, 8b is a piston supporting idler ga, 9b, 1
0a and 10b are pressure chambers for setting the idler movement start behind the floating pistons 7a and 7b, and turtles a and 11b are pressure chambers for initial tension between the pistons 7a and 8a and between 7b and 8b. Piping 1 is the pressure chamber IQa, 10b
It is being transported to

Further, turtle 2 is a pressure reducer, 13 is a pressure reduction piston, 14 is a grease supply hole provided in the same pressure reducer 12, and lr is the inside of the pressure reducer 12 behind the small part of the pressure reduction piston group 3 and the pressure reduction valve 3.
The pipe 15 is connected to the pipe 1 on the downstream side of the pipe, and the pipe 15 is the same pipe.
The check valve r provided in the initial tension pressure chamber 1 through a, 1
1b and the inside of the pressure reducer 12 in front of the large part of the pressure reducing piston 13, and 16a and 16b are the same pipes 1''.
1 is a pipe extending from behind the large light part of the pressure reducing piston 13 to the main system; 17 is a shutoff valve provided in the bypass pipe between the pipes 1 and 1''; 18 is a check valve provided in the main system; A shutoff valve provided in a bypass pipe between the pipes 1', 1...
9a and 19b are shutoff valves provided in the pipe 1''.Next, the tension adjustment of the crawler belt and the operation of the shock absorbing device will be explained.

When the pipe 1 is connected to the main system hydraulic source, the pressure shown in FIG. 4 is obtained. On the other hand, when a load is applied to the fiddlers 9a and 9b, the operation shown in FIG. 5 is performed. That is, if the buffer operation start load is Fs, the initial tension Fo is Fo=0
．． 1~0. is s, and the load Fm at maximum stroke is Fm=
1.3-2. It is about the size of Cape S. Set pressure PS of pressure reducing valve 3
Female = Grave (The bamboo is horizontal to the cross section of the floating pistons 7a and 7b), and when the pressure Pa in the accumulator 5 becomes lower than the set pressure Ps of the pressure reducing valve 3, the pressure in the main system is reduced via the check valve 4. This is transmitted to the accumulator 5, and the pressure Pa in the accumulator 5 becomes the set pressure Ps of the pressure reducing valve 3. Moreover, this pressure Ps is the pressure of the pressure reducing piston 13 of the pressure reducer 12
Go behind the fleas. Therefore, the pressure Po on the output side of the pressure reducer 12 becomes Po=Psx mackerel (the cross-sectional area of the pseudo-carp coral piston 13, Ad is the cross-sectional area of the large diameter portion of the pressure-reducing piston 13).

Also, due to this pressure, the initial tension pressure P in the sword chambers 1 to lib. female. '= vessel (Ao is the cross-sectional area of the pistons 8a, 8b supporting the idlers ga, 9b).

However, if there is no pressure loss, set Po = Pd, but if there is pressure loss △Po, it is necessary to set Po = Por + △Po. After the above settings, the idler 9a receives the load and moves to the left. When the movement starts, the check valve 1@a closes, the floating piston 7a also starts moving in the above direction, and the hydraulic oil in the pressure chamber vine Qa for setting the start of idler movement moves into the accumulator 5. The idler ga stops when the floating piston 7a reaches the stroke end. Also, when the load is released, the hydraulic oil returns from the accumulator 5 to the pressure chamber 10a, and the idler 9a returns to its original state. It returns to the state.At this time, Pa<Ps
Alternatively, if Po′+ΔPo×Po, pressure is replenished by the check valve 4 or 16a. When grease is injected from the grease supply hole 14, the oil from the pressure reducer 12 is returned to the main system via the pipe 1 using the shutoff valve 18. Furthermore, if the pipes 1, 1' break, the emergency shutoff valve 2 is automatically closed to prevent the hydraulic oil of the main system from flowing out. FIG. 6 shows the accumulator 5 of FIG. 3 which stores a constant pressure by applying a pressure reducing valve 3 to the casing 20a, piston rod 20b and piston 20.
A spring 20 for biasing the piston 20c to the right.
d and a drain check valve 20e in place of the energy storage device 20, it is possible to achieve the same effects as the tension adjustment and damping device shown in FIG.

Although the present invention has been described above with reference to embodiments, it goes without saying that the present invention is not limited to such embodiments, and that various design modifications can be made without departing from the spirit of the present invention. .

[Brief explanation of the drawing]

Fig. 1 is a side view schematically showing the tension adjustment and shock absorbing device for a subordinate crawler track, Fig. 2 is a vertical side view showing its details, and Fig. 3 is a side view showing an outline of the tension adjustment and shock absorbing device for the crawler track according to the present invention. An explanatory diagram showing the embodiment, FIG. 4 is an explanatory diagram showing the relationship between system oil pressure and time, FIG. 5 is an explanatory diagram showing the relationship between load and stroke, and FIG. 6 is an explanatory diagram showing the relationship between the load and stroke. and FIG. 7 is an explanatory diagram showing another embodiment of the shock absorbing device. 1... Piping connecting the hydraulic power source of the main system and the pressure chambers 10a, 10b for setting the idler movement start, 1', r
...Piping connecting pressure reducing valve 3 and initial tension pressure chambers lia, 11b, 3...Pressure reducing valve, 4...Check valve, 5 or 20... - Pressure source, 6a. 60・
...Cylinder, 7a, 7b...Floating piston, 8a,
8b...Piston supporting idlers 9a and 9P, 1
2... pressure reducer. ↑Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] 1 A cylinder having a piston that supports an idler and a floating piston, a pressure reducing valve and a pressure reducing valve behind the piping connecting the hydraulic power source of the main system and the pressure chamber for setting the idler movement start of the cylinder formed behind the floating piston. A pressure source provided to store a constant pressure through a check valve, and a pressure chamber for initial tension of a cylinder formed between the piping between the pressure reducing valve and the check valve and each of the pistons are connected. A crawler track tension adjustment and shock absorbing device characterized by comprising a pressure reducer provided in a separate pipe.