CN201246366Y - Self-locking oil cylinder - Google Patents

Abstract

A self-locking oil cylinder comprises a cylinder sleeve, a piston and a piston rod, wherein, a first oil inlet hole and a second oil outlet hole are formed on the cylinder sleeve; the first oil inlet hole and the second oil outlet hole are formed on the front side of the piston and the back side of the piston respectively; a positioning block is further arranged fixedly in the cylinder sleeve; the positioning block is arranged near one of the oil inlet holes; a hole which allows a retainer to move along the piston rod in radial direction is formed on the positioning block; the piston comprises a piston body and a pressing block; the piston body is connected with the piston rod; the pressing block is in elastic connection with the piston body through a second elastic element; a gap which allows the positioning block to be inserted therein is formed between the pressing block and the piston rod; a stopping groove is formed in circumferential direction on the piston rod; and the groove wall of the stopping groove is in smooth transition with the outer diameter of the piston rod. Therefore, while locking the self-locking oil cylinder, the retainer falls into the stopping groove and is stopped by the pressing block along the radial direction of the piston rod; and while unlocking the self-locking oil cylinder, the positioning block is separated from the gap, and the cylinder liner is provided with free space which allows the retainer to move along the radial direction of the piston rod.

Description

Self-locking cylinder

technical field

The utility model relates to a self-locking oil cylinder, in particular to a structure for locking a piston rod by using oil pressure and a stopper.

Background technique

At present, in the hydraulic system, the piston rod of the oil cylinder will be displaced when it is kept in the extended state or the retracted state, especially when it is loaded with a large external force, the piston rod will move under the action of the external force.

Utility model content

The purpose of the utility model is to provide a self-locking oil cylinder using a stopper and oil pressure, and the locking is reliable.

The technical solution adopted by the utility model is: a self-locking oil cylinder, which includes a cylinder liner, a piston, and a piston rod. The cylinder liner is provided with first inlets respectively located on the front side and the rear side of the piston. The oil hole and the second oil inlet hole, the cylinder liner is also fixed with a positioning block, the positioning block is close to one of the above oil inlet holes, and the positioning block is provided with a stopper The hole for moving along the radial direction of the piston rod; the piston includes: a piston body and a pressure block, the piston body is connected to the piston rod, and the pressure block is elastically connected to the On the piston body, there is a gap between the pressing block and the piston rod for the insertion of the positioning block; the piston rod is provided with a stop groove along the circumferential direction, and the The groove wall of the stop groove and the outer diameter of the piston rod make a smooth transition.

The piston body is movably connected to the piston rod through the first elastic member.

The first elastic member and the second elastic member are compression springs.

A side of the pressing block close to the positioning block has an inclined chamfer.

The outer peripheral surface of the piston body and the pressure block is in sealing fit with the inner wall surface of the cylinder liner.

When oil is injected into one of the oil inlet holes, the oil will push the piston and the piston rod to move to the other side of the cylinder liner until the positioning piece is inserted into the gap between the pressure block and the piston rod, and the stopper Falling into the stop groove, the pressure block blocks the stop member along the radial direction of the piston rod, and the self-locking cylinder is locked; when filling oil into the other oil hole , the briquetting block and the piston return under the push of the oil, driving the piston rod back, and the positioning block gradually breaks away from the gap, so that the cylinder liner can move the stopper along the radial direction of the piston rod The free space, the slope on the stop groove just lifts the stopper and leaves the stop groove, and the self-locking oil cylinder is unlocked.

The utility model utilizes oil pressure for unlocking, and the locking is very firm, can withstand external pressure greater than 25MPa, and can also avoid the piston rod back-drawing, and the oil cylinder will only be unlocked when oil is injected into another oil injection hole.

Description of drawings

Accompanying drawing 1 is the half-section schematic diagram (under locked state) of embodiment one of the present utility model;

Accompanying drawing 2 is a half-section schematic diagram of Embodiment 1 of the present utility model (under the unlocked state);

Accompanying drawing 3 is the top view of embodiment one of the utility model;

Accompanying drawing 4 is a half-section schematic diagram (under unlocked state) of Embodiment 2 of the present utility model;

Among them: 1. cylinder liner; 2. piston rod; 3. piston; 4. end cover; 5. positioning block; 6. stop groove; 7. pressing block; 8. earring; 9. first elastic member; The second elastic member; 11, the stopper; 12, the bearing; 13, the first oil inlet hole; 14, the second oil inlet hole; 15, the piston body; 16, the gap;

Detailed ways

Accompanying drawing 1 to accompanying drawing 3 are embodiment one of the present utility model, a kind of tail self-locking oil cylinder, it comprises cylinder liner 1, piston 3, piston rod 2, is opened on the described cylinder liner 1 and is respectively located in the described The first oil inlet hole 13 and the second oil inlet hole 14 on the front side and the rear side of the piston 3 (the left side is the rear in the accompanying drawing 1, and the right side is the front), when the oil cylinder is in the push stroke, the first oil inlet hole The hole 13 enters oil; when the oil cylinder is in the return stroke, the second oil inlet hole 14 enters oil.

The cylinder liner 1 is also fixed with a positioning block 5, the positioning block 5 is located below the first oil inlet hole 13, that is, the position of the tail of the cylinder liner 1, and the positioning block 5 is provided with A hole for the stopper 11 to move in the radial direction of the piston rod 2, the stopper 11 is a spherical ball.

The piston 3 includes: a piston body 15 and a pressure block 7 , the outer peripheral surfaces of the piston body 15 and the pressure block 7 are in sealing fit with the inner wall surface of the cylinder liner 1 . The piston body 15 is connected to the piston rod 2, the piston body 15 is movably connected to the piston rod 2 through the first elastic member 9, and the pressure block 7 is connected to the piston rod 2 through the second elastic member 9. The elastic member 10 is elastically connected to the piston body 15, and there is a gap 16 between the pressure block 7 and the piston rod 2 for the insertion of the positioning block 5. The first elastic Part 9 and the second elastic part 10 are compression springs.

The piston rod 2 is provided with a stop groove 6 along the circumferential direction, and the groove wall of the stop groove 6 transitions smoothly with the outer diameter of the piston rod 2 . When oil is injected into the first oil inlet hole 13, the oil will push the piston 3 and the piston rod 2 to move to the other side of the cylinder liner 1 until the positioning piece 5 is inserted into the gap 16 between the pressure block 7 and the piston rod 2 Inside, the stopper 11 falls into the stopper groove 6, and the pressure block 7 blocks the stopper 11 along the radial direction of the piston rod 2. At this time, the The self-locking oil cylinder is locked; when oil is injected into the second oil inlet hole 14, the pressure block 7 and the piston 3 are pushed back by the oil, driving the piston rod 2 to return, and the positioning block 5 is gradually separated from the gap 16, so that the There is a free space inside the cylinder liner 1 that allows the stopper 11 to move radially along the piston rod 2, and the inclination on the stopper groove 6 just lifts the stopper 11 out of the stopper groove 6. The self-locking cylinder is unlocked.

The side of the pressing block 7 close to the positioning block 5 has an inclined chamfer, which makes it easy for the pressing block 7 to push the stopper 11 downward into the stop groove 6 .

Accompanying drawing 4 is the second embodiment of the present utility model, which differs from the first embodiment in that the positioning block 5 is arranged on the front side of the cylinder liner 1 and below the second oil inlet hole 14 in this embodiment. During work, oil is filled in the first oil inlet 13, and when piston rod 2 is positioned at the front end, brake block 11 falls, and piston rod 2 is locked;

Claims (6)

1. A self-locking oil cylinder, which includes a cylinder liner (1), a piston (3), and a piston rod (2), and the cylinder liner (1) is provided with cylinders located on the front side of the piston (3) respectively. And the first oil inlet hole (13) and the second oil inlet hole (14) on the rear side, it is characterized in that: the positioning block (5) is also fixedly arranged in the cylinder liner (1), and the positioning block (5) Close to one of the above-mentioned oil inlet holes (13, 14), the positioning block (5) is provided with a stopper (11) that can move along the radial direction of the piston rod (2) A moving hole; the piston (3) includes: a piston body (15) and a briquetting block (7), the piston body (15) is connected to the piston rod (2), and the briquetting block (7) Elastically connected to the piston body (15) through the second elastic member (10), and there is an opening for the described pressure block (7) and the piston rod (2). The gap (16) where the positioning block (5) is inserted; the piston rod (2) is provided with a stop groove (6) along the circumferential direction, and the groove wall of the stop groove (6) is in contact with the piston The outer diameter of the rod (2) transitions smoothly. When the self-locking cylinder is locked, the stopper (11) falls into the stop groove (6), and the pressure block (7) Block the stopper (11) along the radial direction of the piston rod (2); when the self-locking cylinder is unlocked, the positioning block (5) breaks away from the notch (16), The cylinder sleeve (1) has a free space in which the stopper (11) can move along the radial direction of the piston rod (2). 2. The self-locking oil cylinder according to claim 1, characterized in that: the piston body (15) is movably connected to the piston rod (2) through the first elastic member (9). 3. The self-locking oil cylinder according to claim 2, characterized in that: the first elastic member (9) and the second elastic member (10) are compression springs. 4. The self-locking oil cylinder according to claim 1, characterized in that: the stopper (11) is a spherical ball. 5. The self-locking oil cylinder according to claim 1, characterized in that: the side of the pressing block (7) close to the positioning block (5) has an inclined chamfer. 6. The self-locking oil cylinder according to claim 1, characterized in that: the outer peripheral surface of the piston body (15) and the pressure block (7) is in contact with the inner wall surface of the cylinder liner (1) Seal fit.

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