CN2391768Y

CN2391768Y - Hydraulic type cable or wire constant tension device

Info

Publication number: CN2391768Y
Application number: CN 99234670
Authority: CN
Inventors: 唐黎清; 史小宜
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-05-31
Filing date: 1999-05-31
Publication date: 2000-08-16
Anticipated expiration: 2009-05-31

Abstract

The utility model relates to a liquid pressing cable constant tension apparatus and uses the characteristic of heat expansion and cold contraction of the gas under the condition that the pressure is not changed to achieve the cable tension constancy. The liquid pressing cable constant tension apparatus comprises an actuating cylinder with a single working chamber, a pressure accumulating device communicated with the actuating cylinder, a pressure meter, the switch of the pressure meter, a gas direction valve, the switch of the gas direction valve, a hanging ear, etc. The actuating cylinder is connected with the pressure accumulating device in series. When the environment temperature is changed, the volume of the gas in the pressure accumulating device needs to be changed if the pressure of the gas in the pressure accumulating device is kept from being changed. The change of the volume pushes the piston of the actuating cylinder through liquid pressing oil to cause a piston rod to expand and shrink. Therefore, the liquid pressing cable constant tension apparatus automatically compensates the length change amount of the outer part clue caused by the temperature change to keep the tension constant. The liquid pressing cable constant tension apparatus has the advantages of simple structure, high compensating precision, flexible action, convenient arrangement, convenient use, etc.

Description

A kind of fluid pressure type clue constant force device

The application relates to a kind of fluid pressure type clue constant force device.It can be used for the contact wire of contact nets in electrified railways and the tension compensating of catenary, also can be used for other industry is decided tension force because of temperature traverse requires to weigh various clues.

For the various clues that require to keep certain tension force, well-known, because the variation of ambient temperature, clue will be stretched, compression deformation, thereby tension force is changed and may things turn out contrary to one's wishes.In order to compensate this distortion, make its tension force keep constant, Chinese patent ZL94243331.9 and ZL96202091.5 disclose two kinds of tension compensators respectively, its the former not only volume is big, install and use also inconvenience,, but still be and body formula structure though the latter has overcome the former above-mentioned shortcoming, pipeline is exposed to the outside, might be damaged in installing and using.We disclose a kind of organization plan of liquid gas integral type tension compensator again in patent ZL97201820.4 later on, though this compensator has overcome above-mentioned two patent major defects, but the pressure accumulator in the compensator is enclosed within the pressurized strut outside, thereby diameter is bigger, the weight of pressure accumulator lays particular stress on, annular capsule process technology is had relatively high expectations, and particularly requires the tighter more apparent difficulty of situation processing for space (as diameter).

The purpose of this utility model is to disclose a kind of not only overcome above-mentioned shortcoming and structure but also simple constant force device scheme, and it both can be used for the loose a little part of space requirement, also can be used for the tighter position of space requirement; Both can be used for vertical installation, and also can be used for level and install.

For achieving the above object, the application proposes following scheme: single epitrochoidal chamber pressurized strut of fluid pressure type clue constant force device becomes to be connected in series with pressure accumulator, the auricle that holds with underwork bonded assembly tape spool is arranged in the rear portion of pressure accumulator, the piston rod head of pressurized strut is connected by transformation ratio mechanism or the direct clue that compensates with requirement, the front end of pressurized strut is provided with a hanger, include air cavity and oil pocket in the pressure accumulator, oil pocket in the pressure accumulator is by a conduit and pressurized strut epitrochoidal chamber UNICOM, air cavity in the pressure accumulator fills high pressure gas so that the energy to be provided, the pressure of this gas is passed to hydraulic oil by elastic capsule, because this oil pocket is communicated with the pressurized strut epitrochoidal chamber, thereby the pressure of hydraulic oil acts on the piston of pressurized strut, when variation of ambient temperature, if keep gaseous tension constant, gas volume will change, and be subjected to displacement thereby make the piston of pressurized strut drive piston rod, with the stroke of realizing that the compensation clue takes place when the temperature traverse.

Now reaching embodiment in conjunction with the accompanying drawings is described further the work of fluid pressure type clue constant force device.

Fig. 1 is a fluid pressure type constant force device organigram.

Fig. 2 is the horizontal scheme of installation of fluid pressure type constant force device.

Fig. 3 is the vertical scheme of installation of fluid pressure type constant force device.

1. piston rods among the figure, 2. zerk, 3. hanger, 4. single epitrochoidal chamber pressurized strut, 5. conduit, 6. the pressurized strut epitrochoidal chamber, 7. piston, 8. pressurized strut inoperative chamber, 9. ventilative mouth, 10. compression indicator and switch, 11. pressure accumulators, 12. air bags, 13. air cavitys, 14. gas are to auricle, the 16. pressure accumulator oil pockets of valve, 15. band oscillating bearings.

Single epitrochoidal chamber pressurized strut (4) becomes install in series with pressure accumulator (11) among Fig. 1 embodiment; One tubular air bag (12) is housed in the pressure accumulator; The air bag mouth is located on the pressure accumulator barrel, and is isolated from the outside to valve (14) by gas; The compression indicator of belt switch is located on the barrel of oil pocket (16) of pressure accumulator (11); Pressurized strut epitrochoidal chamber (6) is by oil pocket (16) UNICOM of conduit (5) with pressure accumulator; In pressurized strut epitrochoidal chamber (6) and the pressure accumulator oil pocket (16) a certain amount of hydraulic oil is housed; In the air cavity (13) of air bag (12), charge into the high pressure gas of certain pressure in the use to valve (14) by gas; The head of piston rod (1) can be with transformation ratio mechanism or is directly linked to each other with clue; The auricle (15) of band oscillating bearing is located at the afterbody of device, and it can be connected with fixed sturcture; Hanger (3) is arranged in the front portion of pressurized strut (4), and it can link to each other by backguy with fixed sturcture.

Among the embodiment shown in Figure 2; show the horizontal installation situation of fluid pressure type constant force device; at this moment; the auricle that tape spool holds (15) can be contained in pillar, hole top or other structural bearing and link to each other; the available backguy of hanger (3) is connected with mounting structure; it both can shield to device, again can balance himself weight.

Among the embodiment shown in Figure 3, show the vertical installation situation of fluid pressure type constant force device, at this moment, the auricle that tape spool holds (15) can be contained in pillar or other structural bearing is connected, the available backguy of hanger (3) is connected to shield with mounting structure.

Principle of work of the present utility model is to utilize the heat expansion of gas, shrinkage characteristic, under pressure unmodified situation, promote piston (7) by hydraulic oil thus drive piston rod (1) requires the clue of compensation with the compensation and the head bonded assembly of piston rod (1) deflection.Specifically, when temperature build-up, the cubic expansion of high pressure gas (when pressure is constant) swells air bag (12), thereby the hydraulic oil in compressing oil pocket (16), this hydraulic oil flows into pressurized strut epitrochoidal chamber (6) by conduit (5) and promotes piston (7) and make piston rod (1) thereby take in and compensate outside clue because of elongation that temperature build-up produced; Equally, but during drop in temperature, its working process is just in time opposite.Select by reasonable parameter, can guarantee that the stretching of piston rod, the amount of contracting just in time equal the deflection of outside clue Yin Wenduization, thereby realize its constant tension.

The utility model has the advantage of that it is monolithic construction, can improve the reliable of its use The property, be again simultaneously that tandem is arranged, can make the product miniaturization, thereby its range of application is expanded greatly Greatly, simultaneously air bag also is common air bag, processes more conveniently, so it has simple in structure, volume Little, in light weight, applied range, compensation precision height, be active in one's movements the advantage such as easy to install.

Claims

1, a kind of fluid pressure type clue constant force device, it comprises auricle, compression indicator and the switch etc. that pressurized strut, pressure accumulator, tape spool hold, the pressurized strut that it is characterized in that single epitrochoidal chamber becomes to be connected in series with pressure accumulator, by conduit UNICOM, form an independently hydraulic efficiency pressure system between the epitrochoidal chamber of pressurized strut and the oil pocket of pressure accumulator.

2, fluid pressure type clue constant force device as claimed in claim 1 is characterized in that the high pressure gas in the pressure accumulator are contained in the air bag, and air bag is isolated its high pressure gas and hydraulic oil.

3, as claim 1,2 described fluid pressure type clue constant force devices; the front end that it is characterized in that pressurized strut has a hanger, and this hanger is connected with mounting structure, shields when vertical the installation; level both can shield when installing, again can be in order to himself weight of balance.