JPH0428370Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a brake device for a rotating part of a crusher having a rotatable mounting part.

BACKGROUND ART FIG. 10 is a front view showing a crusher that operates a cutter using a hydraulic cylinder to crush reinforced concrete and other structures. As shown in FIG. 10, it consists of a main body 60, a cutter arm 61, a hydraulic cylinder 62, etc.
support 6 with mounting bracket 64 to 3;
A rotating race 65 is installed between the crusher and the crusher 4', and when the crusher is attached to the arm 63, the main body 60 can freely rotate, and the cutter 66 bites the object to be crushed in a direction perpendicular to the object during crushing. I'm trying to do that. For this reason, the main body 60 can be freely rotated, but if the main body 60 can be rotated too easily, the direction will not be determined, so a brake device is provided to provide a certain degree of resistance. If this brake device is too loose, the direction will not be determined easily, and if it is too hard, an unreasonable twisting action will be exerted between the crusher and the arm of the hydraulic excavator during crushing work, which will have a negative effect on the hydraulic excavator body. Become. Therefore, this brake device must be capable of applying an appropriate braking force.

FIG. 11 is a sectional view of a main part of a conventional brake device. In view of the above requirements, a conventional brake device for preventing rotation of a crusher has a piston 46 installed inside a block 45 as shown in FIG.
Then, by inserting a steel ball 47 as a brake member and pushing the piston 46 with a spring 48, the steel ball 47
A method of braking by pressing the inner teeth 51 of the rotating race against the valley f of the inner teeth 51 is used. Also, Figure 12 shows
FIG. 7 is a sectional view of a main part showing another embodiment of a brake device according to the prior art. FIG. 13 is a view taken from BB in FIG. 12. As shown in FIG. 12, there is also a method in which a large number of recesses 53 are continuously provided on the upper surface of the swing race 52, and a steel ball 56 is pressed against the recesses 53 using a spring 54 and a piston 55 to perform braking. There is.

Problems to be solved by the invention As mentioned above, the inner teeth of the race that rotates the steel ball with a spring,
Alternatively, braking by pressing against the recess on the top surface is a simple and extremely effective braking method in that it can generate an appropriate amount of braking force. 51
In both cases, the contact portion is a point contact, both when it comes into contact with the recess 53 provided on the upper surface of the turning race 52 as shown in FIG. 12. In particular, when the steel ball 47 gets over the internal teeth 51 or moves onto the next recess 53, it must move against the action of the springs 48 and 54, and the pushing force of the springs at that point is strong. Since the surface pressure is the highest, the surface pressure is high because these contact areas are point contacts, which can easily damage the raceway and leave line contact scars over the entire circumference due to long-term use. become.
In addition, with long-term use, the peak between the recesses 53 becomes lower, resulting in less resistance during rotation, which causes a decrease in braking force, and even if adjustments are made frequently, the adjustment does not have any effect. become a state.

This invention solves the above problems and does not damage the opposing tooth surface even if used for a long period of time.
The object of the present invention is to provide a device that does not reduce braking force.

Means for Solving the Problems The means of the present invention taken to solve the above problems are as follows: (a) At the upper part of the main body having the crushing device, a pin that can be fitted into the inner teeth of the inner ring is installed inside the turning race. (b) A block is fixedly provided at the top of the main body to hold the above pin, a hole is drilled in the block in the front and back direction, and a piston and a spring are provided in the hole to push the pin; (c) the above spring is A retainer is screwed into the rear part of the hole of the block so as to position the rear end, and a pressing device is attached to adjust the operating force of the spring by adjusting the screwing position of the retainer in the longitudinal direction.

Embodiments Hereinafter, embodiments of the present invention will be described in detail based on the drawings. FIG. 1 is a front view showing the Bourek device of the present invention. FIG. 2 is a sectional view of a main part taken along line A-A in FIG. 1. FIG. 3 is an overall front view of a crusher equipped with the brake device of the present invention.
FIGS. 4 to 9 are perspective views showing various components constituting the brake device of the present invention.

Next, the brake device of the present invention will be described with reference to FIGS. 1 to 9. Reference numeral 1 denotes a crusher main body, on which a support body 3 is attached via a rotating race 2 to the upper part, and a pair of left and right rotating arms 5 are pivotally attached to the lower part by pins 4. Near the top of the left and right pair of rotary arms 5, a hydraulic cylinder 6 that operates the arms is pivoted by a pin 7, and the hydraulic cylinder 6 is operated to rotate the rotary arm 5 and perform the crushing work. It is something. A mounting bracket 8 is provided projecting from the upper part of the support body 3, and is connected to an arm 9 of a working machine via the mounting bracket 8.

A pressing device 10 is arranged on the upper surface of the main body 1 and inside the turning race 2. The pressing device 10 is for braking the rotation of the swing race 2, that is, the rotation of the main body 1 connected to the outer ring 11 side of the swing race 2 and the support body 3 connected to the inner ring 12 side, to a certain limit. , a pin 14 that meshes with the inner teeth 13 of the inner ring 12, an adapter 15 for pushing the pin 14,
A piston 16, a spring 17, a retainer 18 for adjusting the spring 17, a block 19 for housing these, and a pedestal 2 on which the block 19 is installed.
Consists of 0 magnitude.

The pin 14 has a length slightly longer than the tooth width a of the internal teeth 13, has a small diameter portion 21 at the bottom, and has a diameter considerably larger than the spacing b between the tips of the teeth.
3, it is large enough to fit into the valley e between the teeth by about 3 to 4 mm from the line d of the tooth tip. Note that the lower part of the pin 14 should not have the same diameter as the small diameter part 21.
The reason for this is to prevent the pin 14 from moving when it is inserted into the pedestal 20 due to the fitting portion becoming clogged with dirt, concrete, etc. The pin 14 is fitted into a semicircular vertical notch 22 bored in the front of the block 19. The notch hole 22 of the block 19 has approximately the same diameter and depth as the diameter of the pin 14, and is open at the front so that it can be pushed forward by the spring 17 and protrude slightly forward, and can be pushed back by the spring 17. In this case, it can be completely sunk into the notch hole 22. A hole 25 is bored in the inner middle part of the block 19 in the front-rear direction, that is, in a direction perpendicular to the pin 14, and the adapter 15, piston 16, and spring 17 are fitted into the hole 25, and a retainer is inserted in the rear part. 18 are screwed together.
The adapter 15 is used to evenly transmit the pushing force of the piston 16 to the pin 14, and as shown in FIG. It has a semi-circular notch so that it can fit into the section. The piston 16 has an annular groove 26 in the large diameter part at the front, into which an O-ring 23 is fitted, and the rear part of the small diameter part is slidably fitted into the hole 27 of the retainer 18. It is pushed forward by a spring 17 inserted between it and the large diameter part. The retainer 18 is connected to the hole 25 in the block 19.
The rear part of the piston 16 is fitted into the internal hole 27, and the rear part has a hexagonal hole 28 for screwing, and a nut 29 to prevent it from coming off is installed on the outside. They are screwed together. As shown in FIG. 4, the lower part of the block 19 is cut out parallel to the front and back on both sides, and the upper part of the pedestal 20 is cut out in a concave shape so that it can fit therewith, and the block 19 is cut in this part. The lower portions of the two are fitted together to connect them together, and are connected with bolts 30. Therefore, the pin 14 is inserted into the notch hole 22 with its lower end resting on the bottom surface 31 of the base 20. In addition, the upper part of the block 19 has a fitting hole 25 for the piston 16.
An annular groove 33 is formed at the rear of the piston 16, and an O-ring 34 is inserted into the annular groove 33.

The present invention is constructed as described above, but in actual operation, when the crusher itself is facing downward, horizontally, diagonally, etc., and the support body 3 are rotatably connected via the swing race 2, so that the pressing device 10 attached to the main body 1 integrated with the outer ring 11 of the swing race 2 and the inner teeth of the inner ring of the swing race 2 13 through the pin 14 of the pressing device 10. The pin 14 is pushed forward by the spring 17 fitted between the retainer 18 at the rear and the piston 16 via the adapter 15 fitted to the front of the piston 16, so that the pin 14 is just aligned with the internal teeth 13. When it is at the tip of the tooth,
It is in a state where it is in contact with this, but when it goes beyond this, it jumps out a little forward and comes into a state where it fits into the valley e between the teeth. Since the length of the pin 14 is made to be slightly larger than the tooth width of the internal teeth 13, the pin 14 fits into the valley e over the entire tooth width, and the spring 17 is composed of a disc spring. Since the operating force is large compared to its installation length, the pin 14 is reliably pressed against the valley e with a large force, and the pressing device 10 is braked so that it cannot easily move relative to the inner ring 12. It is maintained in the same state. Therefore, since the driver performs the crushing work, the main body 1 will not rotate freely even when the main body 1 is directed toward the object to be crushed, and the driver can reliably grasp the object to be crushed.

Next, the position of the object to be crushed changes, and the main body 1
If the main body 1 cannot be gripped in a good posture unless rotated, press a part of the main body 1 against another object and use it as a fulcrum and move it slightly to the side. The pin 14 overcomes the force of the spring 17 that presses the pin 14 against the valley e of the internal tooth 13.
moves beyond the tip of the tooth. The main body 1 is a pressing device 10
Because it rotates by overcoming the braking force, it can rotate in the desired direction. A spring 17 for actuating the pin 14 can be freely adjusted by a retainer 18. To adjust, loosen the nut 29, insert a wrench into the hexagonal hole 28, tighten the retainer 18,
Alternatively, the braking force of the pin 14 can be easily adjusted by loosening it.

The notch hole 22 of the block 19 into which the pin 14 is inserted is deep enough to fit into the notch hole 22 when the pin 14 is retracted. Therefore, when the pin 14 is pushed forward and fitted into the internal teeth 13, a space is created at the rear of the pin 14. Crushing work using a crusher involves static crushing using hydraulic cylinders, which always produces a considerable amount of earth and sand.
Concrete powder and the like scatter and accumulate in the space of the notch hole 22, making it impossible for the pin 14 to retreat. In order to avoid this, the lower part of the pin 14 is made to have a small diameter 21 so that the pin 14 can retreat even if some dirt accumulates, thereby preventing the pin 14 from remaining pushed out and becoming unable to release the brake state. . In addition, an oil inlet 43 is provided above the insertion part of the spring 17 of the block 19, and the piston 16 is sealed to prevent oil leakage at the front and rear, so that the piston 16 does not become inoperable due to rust etc. do not have.

Effects of the invention As described above, the present invention is constructed so that the inner teeth of the inner ring of the swing race that is integrated with the support body and the pins that are fitted into the block on the upper part of the main body that are integrated with the outer ring fit together. When the pin passes over the tip of the internal tooth to rotate, it comes into contact with the entire surface of the tooth and is pressed against it, so it is no longer a point contact like a conventional steel ball, so the contact area Since it becomes a line contact part, the surface pressure becomes much smaller, so there is almost no wear or denting of the tooth tip, and the life of the tooth tip can be extended. In addition, since the pin itself has a low surface pressure and forms a rolling contact, there is extremely little wear and tear, and there is no need for frequent adjustments for wear, and there is no adjustment allowance when used for a long period of time, and weld overlay regeneration is possible. etc. is not necessary. In particular, in the case of conventional steel balls, if the steel ball itself becomes too hard, there is a risk of damaging the tips of the teeth, so the ball was kept in a low state, resulting in a high rate of wear. This made it possible to increase the hardness of the pin, making the pin more durable and reducing wear and tear.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the brake device of the present invention;
Figure 2 is a cross-sectional view of the main parts taken along line A-A in Figure 1, Figure 3 is an overall front view of a crusher equipped with the brake device of the present invention, and Figures 4 to 9 are the brakes of the present invention. FIG. 10 is a front view showing a conventional crusher;
FIG. 11 is a cross-sectional view of a main part showing a conventional brake device, FIG. 12 is a cross-sectional view of a main part showing another embodiment of a brake device of the prior art, and FIG. 13 is a cross-sectional view of a main part shown in FIG.
It is a view seen from B. 1,60...main body, 2,52,65...swivel race, 3,64'...support body, 10...pressing device,
11... Outer ring, 12... Inner ring, 13, 51... Inner tooth, 14... Pin, 16, 46, 55... Piston, 17, 48, 54... Spring, 18... Retainer, 19, 45... ...Brock.

Claims (1)

[Scope of utility model registration request] In a crusher, the main body has a crushing device, and the outer ring side of the swing race is connected to the main body and the inner ring side is connected to the upper support side, so that the main body can rotate relative to the support body. A pin that can fit into the inner teeth of the inner ring is placed inside the rotating race at the top.
A block is fixedly provided at the top of the main body to hold the pin, a hole is drilled in the block in the front and back direction, a piston and a spring are installed in the hole to push the pin, and the rear end of the spring is positioned. A rotary crusher characterized in that a retainer is screwed into the rear part of the hole of the block, and a pressing device is attached to adjust the operating force of the spring by adjusting the screwing position of the retainer in the front and back direction. brake equipment.