CN2529853Y

CN2529853Y - Drag link tightener

Info

Publication number: CN2529853Y
Application number: CN 02219813
Authority: CN
Inventors: 郭正兴; 冯健
Original assignee: Nanjing Dongda Modern Prestress Engineering Co Ltd
Current assignee: Nanjing Dongda Modern Prestress Engineering Co Ltd
Priority date: 2002-04-08
Filing date: 2002-04-08
Publication date: 2003-01-08
Anticipated expiration: 2012-04-08

Abstract

The utility model relates to a tension rod which is a jack used for pre-stress tension of steel bar, the jack is composed of a hydraulic cylinder, a piston rod, an upper clamping plate block and a lower clamping plate block; a cylinder tube 17 of the hydraulic cylinder is installed at lower part of the upper clamping plate block 2, one end of the piston rod 4 is connected with a piston 8 and is in the cylinder tube 17, the other end of the piston rod 4 is fixed on the lower clamping plate block via an adjusting nut 10; a cross section of the upper clamping plate block 2 and the lower clamping plate block 3 are ''U'' shaped, a press nut 13 is respectively installed at the center hole of the clamping plate block 2 and the lower clamping plate block 3; the cylinder tube 17 and the piston rod 4 are symmetrically distributed outside of an axial line of the tensioned steel bar 11, a bush 16 is padded between the piston rod 4 and the upper clamping plate block and between the piston rod 4 and the lower clamping plate block 3; the side of the cylinder tube 17 is provided with an oil return nozzle 6, and the back end of the cylinder tube 17 is provided with an oil inlet nozzle 5.

Description

The Drag link tightener device

One, technical field

The utility model is a kind of jack that is used for the rod iron prestressed stretch-draw, belongs to the technical field of Construction of Civil Engineering mechanical equipment.

Two, background technology

In civil engineering structure, two ends band fork ear pin joint, the centre can be used as suspension rod, pull bar, structure bridging etc. with the rod iron of positive and negative coupling bush after applying prestress.

How rod iron to the two ends pin joint applies prestress at middle part coupling bush place, does not domesticly see its similar tensioning equipment.There is similar Drag link tightener device in the MACALLOY company of external Britain.The stretch-draw jack of MACALLOY company adopts the clamping plate piece to be recessed the monolithic construction of four oil cylinders, adopts rated oil pressure to reach the superelevation oil pressure of 135MPa.The shortcoming of this stretch-draw jack is: 1. rated oil pressure is too high, and the superelevation oil pressure of 135MPa requires too highly to sealing member, and not being suitable for the civil engineering rated oil pressure is the prestressed stretch-draw oil pump of 60MPa.2. rod iron has serial size, and serial stretching force is also arranged.The intraplate four cylinder integral tension jack commonalities of recessed folder are not strong, are not easy to the serial stretching force that flexible combination becomes to be applicable to the different rod footpath.

Three, technology contents

1, goal of the invention:

The utility model purpose provides a kind of and common prestressed stretch-draw oil pump rated oil pressure 60MPa and is complementary, and little jack cylinder and clamping plate piece apart arrangement realize the Drag link tightener device of different rod footpath and stretching force flexible combination.

2, technical scheme:

The utility model is a kind of Drag link tightener device, by hydraulic actuating cylinder, piston rod and last fixture block, following fixture block is formed, the cylinder body of hydraulic actuating cylinder is positioned at the bottom of train wheel bridge piece, one end of piston rod is connected with piston and is arranged in cylinder body, the other end of piston rod is fixed on the lower plate piece by adjustment nut, the cross-sectional plane of train wheel bridge piece and lower plate piece is " U " shape, central hole at train wheel bridge piece and lower plate piece is respectively equipped with the pressure-bearing nut, cylinder body and piston rod are symmetrically distributed in outside the rod iron axis that is tightened up, the cylinder body that is positioned at train wheel bridge piece bottom has 4, be symmetrically distributed in outside the axis of the rod iron that the axle center of train wheel bridge piece promptly is tightened up, be lined with lining between piston rod and the train wheel bridge piece and between piston rod and the lower plate piece, the side of cylinder body is provided with oil return nozzle, is provided with inlet nozzle in the rearward end of cylinder body.

3, technique effect:

Drag link tightener device of the present utility model will be owing to will clamp the piston rod that the feedthrough pull bar of upper and lower clamping plate piece changes the little jack of pipe link double as into, obtain being used for the maximum functional piston area of stretch-draw, under the condition of rated oil pressure 60MPa, obtained the maximum stretching force identical with external like product.

Drag link tightener device of the present utility model also owing to adopted four or two little jacks and clamping plate apart arrangement, can dispose the little jack of different tension tonnages neatly, and not need to change clamping plate; Or do not change little jack, and only change the not high upper and lower clamping plate piece size of processing request, realized being applicable to the series of combination of different rod footpath and tension tonnage, further improved the field of application of jack.

Four, description of drawings

Fig. 1 is an overall structure scheme drawing of the present utility model.Little jack 1 is wherein arranged, train wheel bridge piece 2, lower plate piece 3, piston rod 4, inlet nozzle 5, oil return nozzle 6, locating dowel pin 7, piston 8, jack end cap 9, adjustment nut 10, rod iron 11, positive and negative tooth coupling bush 12, pressure-bearing nut 13, lining 16, cylinder body 17.

Fig. 2 is an end face structure scheme drawing of the present utility model.Multiport valve 14, oil pipe 15 are wherein arranged.

Five, the specific embodiment

Little jack 1 is processed respectively, and each jack cylinder body 17 exterior bottom is fluted, is convenient to fix with locating dowel pin and train wheel bridge 2, and piston rod 4 sticks with glue agent when screwing in pistons 8 and fixes.Train wheel bridge piece 2 and lower plate piece 3 forge moulding, and the centre has " U " shape groove, is convenient to snap in rod iron.After the piston rod 4 and the jack 1 of double as pull bar is assembled into integral body, penetrate train wheel bridge piece 2 and lower plate piece 3 cooresponding linings 16, with the distance of rod end adjustment nut 10 adjusting two clamping plates interblocks.Pump fuel feed by five-way valve oil-feed and oil return, makes four or two little jack 1 synchronous workings, realize the clamping of two clamping plate pieces and unclamp, match therewith, rotate the middle positive and negative tooth coupling bush 12 of rod iron, pin the pre-stretching force of in rod iron, having set up with special wrench.In conjunction with different stretching forces, the tonnage of replaceable little jack.Or according to different rods footpath, only replace with, the lower plate piece.

Claims

1, a kind of Drag link tightener device, by hydraulic actuating cylinder, piston rod and last fixture block, following fixture block is formed, it is characterized in that the cylinder body (17) of hydraulic actuating cylinder is positioned at the bottom of train wheel bridge piece (2), one end of piston rod (4) is connected with piston (8) and is arranged in cylinder body (17), the other end of piston rod (4) is fixed on the lower plate piece (3) by adjustment nut (10), the cross-sectional plane of train wheel bridge piece (2) and lower plate piece (3) is " U " shape, central hole at train wheel bridge piece (2) and lower plate piece (3) is respectively equipped with pressure-bearing nut (13), and cylinder body (17) and piston rod (4) are symmetrically distributed in outside rod iron (11) axis that is tightened up.

2, Drag link tightener device according to claim 1 is characterized in that the cylinder body (17) that is positioned at train wheel bridge piece (2) bottom has 4, is symmetrically distributed in outside the axis of the rod iron (11) that the axle center of train wheel bridge piece (2) promptly is tightened up.

3, Drag link tightener device according to claim 1 is characterized in that being lined with lining (16) between piston rod (4) and the train wheel bridge piece (2) and between piston rod (4) and the lower plate piece (3).

4, Drag link tightener device according to claim 1 is characterized in that the side of cylinder body (17) is provided with oil return nozzle (6), is provided with inlet nozzle (5) in the rearward end of cylinder body (17).