CN2439436Y

CN2439436Y - Stop turning type jack

Info

Publication number: CN2439436Y
Application number: CN 00235332
Authority: CN
Inventors: 黄建勋; 吴志勇; 严李荣
Original assignee: LIUZHOU CONSTRUCTION MACHINERY FACTORY GENERAL
Current assignee: LIUZHOU CONSTRUCTION MACHINERY FACTORY GENERAL
Priority date: 2000-05-20
Filing date: 2000-05-20
Publication date: 2001-07-18
Anticipated expiration: 2010-05-20

Abstract

The utility model relates to a stop turning type jack which comprises an oil cylinder 3 which is assembled on a pressing plate 1 and a positioning screw plug 2, a guide sleeve 5 which is positioned in the oil cylinder, a piston 4 which is arranged between the oil cylinder and the guide sleeve, a connecting sleeve 6 which is assembled in the oil cylinder and is connected with the guide sleeve through screw threads, an anchor cup 8 and a clamping piece which are orderly assembled, and a supporting sleeve which is positioned at the top end of the jack. The inner cavity of the piston 4 is formed into a guiding groove. The outer margin of the anchor cup 8 is provided with a key groove. A key 7 is arranged between the key groove and the guiding groove of the piston 4 and can axially move along the guiding groove. The jack can not follow the stretching of a steel strand to rotate on the occasion of operation. The utility model has the advantages of little operating space, convenient construction, beautiful appearance, etc.

Description

The spline jack

The utility model relates to a kind of pre-stress construction facility, particularly a kind of jack.

Development along with prestressing technique, unit in charge of construction is more and more higher to the requirement of the safety of prestress facility, two major part oil cylinders of existing jack and piston are when the stretch-draw prestressing force steel strand, because steel strand are to be formed by many steel wire snarls, the two ends of steel strand all produce very big moment of torsion when being subjected to tension force, make oil cylinder and piston relatively rotate, existing do not have the jack of rotation stop device will produce rotation, thereby make the oil pipe generation twisting that is connected on the jack, when serious even normally stretch-draw, and, the main stressed member anchor cup of jack, coupling nut and punching cover are to be threaded, be subjected to the steel strand torsion effect, loosening danger is arranged, not too safe.

The existing jack that rotation stop device is housed, its rotation stop device is to adopt welding method that oil cylinder and support sleeve are coupled together in the jack outside with a long scotch, the operational space of jack is increased greatly, and when the single pre-stretch-draw of carrying out group anchor, construction is difficulty very.

The purpose of this utility model is to overcome the above-mentioned hidden danger of the jack that has no rotation stop device, provide a kind of can be under the prerequisite of the operational space that does not increase jack, also can limit the rotational freedom of oil cylinder and piston, prevent the spline jack that drives the jack rotation that reverses of steel strand.

For reaching above-mentioned purpose, the spline jack of the utility model comprise be assemblied in oil cylinder on the screw plug of pressing plate and location, in-oil cylinder punching cover, be contained in the piston between oil cylinder and the punching cover and be assemblied in the oil cylinder and with punching external threading bonded assembly adapter sleeve, the anchor cup, intermediate plate, the support sleeve that assemble successively, it is characterized in that: the inner chamber of described piston is processed with a guide groove, anchor cup outer rim has a keyway, and key is installed between the guide groove of this keyway and piston and can moves axially along guide groove.

Owing to be processed with a guide groove on the piston cavity of the spline jack of the utility model, anchor cup outer rim has a keyway, key is between keyway and guide groove, like this, the moment of torsion of guiding principle twisted wire passes on the key by the anchor cup, pass on the piston by key, pass to it with on the support sleeve that is threaded by piston again, silking is motionless because the friction force that support sleeve relies on and member is huge has overcome the moment of torsion of guiding principle twisted wire, also just prevented the rotation of anchor cup, the anchor cup can only be moved axially along the guide groove on the piston, thereby, make the oil cylinder of this jack and punching cover not be subjected to moment of torsion, can not rotate, therefore, avoided being connected oil pipe generation twisting on the jack, the main stressed member anchor cup of jack, coupling nut and punching cover produce loosening danger, safety of operation.

Compare with existing spline jack, the spline jack of the utility model also has advantages such as the operational space is little, easy construction, good looking appearance.

Below in conjunction with drawings and Examples, the architectural feature of the spline jack of the utility model is further described.

Fig. 1: spline jack structure scheme drawing (the main cutaway view of looking);

The A-A cutaway view of Fig. 2: Fig. 1.

Embodiment:

A kind of spline jack, comprise the anchor cup 8, the intermediate plate 9 that are assemblied in oil cylinder 3, the cover of the punching oil cylinder 3 in 5 on the screw plug 2 of pressing plate 1 and location, are contained in the piston 4 between oil cylinder 3 and the punching cover 5 and are assemblied in the oil cylinder and overlap 5 adapter sleeves that are threaded 6, assemble successively with punching, the support sleeve 10 that is positioned at the jack top is threaded with piston 4, the inner chamber of described piston 4 is processed a right guide groove, anchor cup 8 outer rims have a keyway, and key 7 is installed between the guide groove of this keyway and piston 4 and can moves axially along guide groove.

Claims

1, a kind of spline jack, comprise and be assemblied in pressing plate (1) and the oil cylinder (3) of locating on the screw plug (2), be positioned at the punching cover (5) of oil cylinder (3), be contained in the piston (4) between oil cylinder (3) and the punching cover (5) and be assemblied in the oil cylinder and the adapter sleeve (6) that is threaded with punching cover (5), Zhuan Pei anchor cup (8) successively, intermediate plate (9), the support sleeve (10) that is positioned at the jack top is threaded with piston (4), it is characterized in that: the inner chamber of described piston (4) is processed with a guide groove, anchor cup (8) outer rim has a keyway, and key (7) is installed between the guide groove of this keyway and piston (4) and can moves axially along guide groove.