KR20030050660A - Apparatus for preventing from loosing piston of hydraulic cylinder - Google Patents

Abstract

PURPOSE: A displacement preventing device of a piston for a hydraulic and pneumatic cylinder is provided to prevent accidents or breakage of heavy equipments by restricting the piston from being separated from the screw of the rod with operating repulsive force between the piston and the lock nut through the elastic force of the spring. CONSTITUTION: A piston is combined with a screw part of a rod, and reciprocated linearly within the range of stroke. A displacement restricting device of the piston in a hydraulic and pneumatic cylinder has a lock nut(8) and a washer(3) combined with the rod and prevents the piston from being separated from the rod in linear movement. An elastic member(12) is elastically installed between the washer and the lock nut to prevent the displacement of the piston by removing torque of the lock nut with reciprocal repulsive force of the piston and the lock nut. The leaf spring or the coil spring is used as the elastic member.

Description

Apparatus for preventing from loosing piston of hydraulic cylinder}

The present invention relates to a piston loosening prevention device of a pneumatic cylinder which can prevent the piston fastened to the threaded portion of the rod from being released from the rod during the linear reciprocating motion within the set stroke range.

More specifically, the repulsive force is always acted between the piston and the lock nut by the spring force placed between the lock nut and the washer that is fastened to the rod to prevent the piston from slipping out, thereby reducing the torque. The present invention relates to a piston loosening prevention device of a pneumatic cylinder which can prevent loosening of a piston.

Generally, hydraulic cylinders used in heavy construction equipment or industrial machinery are installed to linearly reciprocate the piston along the rod for thrust generation and small chamber or large chamber separation, and can prevent the piston from releasing from the rod. To form a screw portion to the piston inner circumference coupled to the rod so as to fasten, or to be fastened by fitting.

As shown in FIG. 1, a hydraulic cylinder used for industrial heavy equipment or various machinery is fastened to the threaded portion 1a of the rod 1 and reciprocates within a set stroke range upon inflow of hydraulic fluid through the port 2. Piston 4, cover 6 welded to both ends of tube 5, lock nut 8 and washer 3 for preventing piston 4 from being separated from rod 1, piston O-ring (9) to prevent leakage through the gap between the (4) and the threaded portion (1a), and cushioning ring coupled to the outer periphery of the rod (1) to mitigate the impact generated during the stroke end of the piston (4) (10) is provided.

At this time, the torque in which the piston 4 is fastened to the threaded portion 1a of the rod 1 during the linear reciprocating motion within the set stroke range of the piston 4 is lost, so that the piston 4 is relaxed and the rod 1 If the deviation from the, the function of the pneumatic cylinder is not only malfunction, but also has a problem that can cause a serious safety accident due to personal injury or damage to heavy equipment.

Accordingly, an object of the present invention is to prevent the loosening of the piston from the rod by the tension of the piston and the lock nut at all times by the elastic force of the spring placed between the lock nut and the washer that is fastened to the rod life-saving or heavy equipment To prevent the piston loosening of the pneumatic cylinder to prevent the breakage.

1 is a schematic view of a typical pneumatic cylinder,

Figure 2 is a schematic view of the piston loosening prevention device of the hydraulic cylinder of the prior art,

3 is a schematic view of the piston loosening prevention device of the pneumatic cylinder according to an embodiment of the present invention,

4 is a view of a piston loosening prevention device of a pneumatic cylinder according to another embodiment of the present invention.

* Explanation of symbols used in the main part of the drawing

One; road

2; port

3; washer

4; piston

5; tube

6; cover

8; Locknut

12; Elastic member

The above object of the present invention is a piston of a hydraulic pneumatic cylinder having a lock nut and a washer fastened to the rod so as to prevent the piston fastened to the threaded portion of the rod from escaping from the rod during the linear reciprocating motion within the set stroke range. In the anti-loosening device, the piston and the lock nut have mutual repulsion force, so that an elastic member is installed between the washer and the lock nut to prevent the piston from loosening due to the torque loss of the lock nut. By providing an anti-loosening device.

According to a preferred embodiment, any one of the above-mentioned elastic member of the leaf spring and the coil spring is used.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, which are intended to be described in detail so that those skilled in the art to which the present invention pertains can easily carry out the present invention. It does not mean that the technical spirit and scope are limited.

As shown in Figures 2 to 4, the piston loosening prevention device of the pneumatic cylinder according to the present invention, the piston is fastened in the rod 1 and reciprocating within the set stroke range upon the inflow of hydraulic fluid through the port (2) (4), a cover (6) welded at both ends of the tube (5), a locking member (8) of the lock nut and washer to prevent the piston (4) from being detached from the rod (1), and the piston (4). ) O-ring (9) to prevent leakage through the gap between the threaded portion (1a) and cushioning ring (10) coupled to the outer periphery of the rod (1) to mitigate the impact generated during the stroke end of the piston (4) Applied to the hydraulic cylinder having a), these will be applied substantially the same as shown in Figure 1, so that the detailed description of the configuration and operation will be omitted below, overlapping reference numerals will be found to be the same.

Therefore, according to a preferred embodiment of the present invention, the piston 4 and the lock nut 8 described above have mutual repulsion force and the piston 4 is removed from the rod 1 due to the torque loss of the lock nut 8. The elastic member 12 is coalesced between the washer 3 and the lock nut 8 to prevent loosening.

At this time, the above-described elastic member 12 may be used as a wire-type coil spring, a leaf spring or a mechanism or member having elastic force, and the aforementioned elastic member 12 is formed integrally with the washer 3, or assembled. Of course, the washer 3 and the elastic member 12 can be formed in a separate type for convenience of course.

Hereinafter, the operation of the piston loosening prevention device of the pneumatic cylinder according to the present invention will be described in detail with reference to the accompanying drawings.

The piston 4, which is fastened to the threaded portion 1a of the rod 1, is locked to the threaded portion 1a so as to prevent the piston 4 from being loosened from the threaded portion 1a due to shock or vibration during linear reciprocating movement within the set stroke range. The nut 8 is fastened and a washer 3 is inserted between the piston 4 and the lock nut 8.

At this time, as shown in FIG. 3, as the elastic member 12 is installed between the washer 3 and the lock nut 8 such that the piston 4 and the lock nut 8 have mutually repulsive forces at all times, Due to the elastic force of the elastic member 12 described above, the lock nut 8 is held in tension by a force acting in the opposite direction with respect to the piston 4, so that the torque loss to the threaded portion 1a of the rod 1 is lost. Can be prevented.

Accordingly, the piston 4, which is linearly reciprocating along the rod 1, is prevented from loosening from the threaded portion 1a of the rod 1 by the torque of the lock nut 8 due to vibration and shock generated at the stroke end. Will be.

On the other hand, as shown in Figure 4, the plate spring can be used as the elastic member 12 is installed in a plurality of places to generate a repulsive force between the above-described piston (4) and the lock nut (8).

As mentioned above, according to a preferable embodiment, it has the following advantages.

Repulsive force is always applied between the piston and the lock nut by the elastic force of the spring placed between the lock nut and the washer that is connected to the rod to prevent loosening of the piston from the thread of the rod to prevent personal injury or damage to heavy equipment. It becomes possible.

Claims (2)

In a piston loosening prevention device of a pneumatic cylinder having a lock nut and a washer fastened to the rod to prevent the piston fastened to the thread of the rod from being released from the rod during the linear reciprocating movement within the set stroke range: The piston of the pneumatic cylinder, characterized in that the elastic member is installed between the washer and the lock nut so that the piston and the lock nut have a mutual repulsive force to prevent the piston from loosening due to torque loss of the lock nut. Loosening prevention device. The method of claim 1, wherein the elastic member is any one of a leaf spring and a coil spring is used to prevent piston loosening of the pneumatic cylinder.