CN1010227B - Hoisting jack with self-synchronizing steplength - Google Patents

Abstract

The present invention relates to novel construction equipment which is used in the engineering of a hydraulic climbing form. The present invention can realize the automatically synchronous lifting for a jack group. Besides, the existing equipment does not need any change in other aspects. The working part of the present invention can use the major structure of a special jack with the existing any structural style, and the control part is arranged on the major structure. Besides, the present invention can carry out setting operation according to uniform standard step distances and a closed-loop control mode. In theory, the maximum value of synchronous errors of the machine is not influenced by loading change and is not increased with lifting times. The present invention has the advantage of high synchronous precision. Generally, the theoretic maximum value of the synchronous errors is not greater than 15mm.

Description

Hoisting jack with self-synchronizing steplength

The present invention is a kind of novel building equipment, uses this machine in the hydraulic climbing form work engineering, can realize the syn of jack colony, and other construction occasion that needs to promote synchronously also can be used this machine.

Along with developing rapidly of Industrial and Civil Engineering, the field of application of roll extrusion Slippery Rise Template Construction Technique is in continuous expansion.Particularly, adopted in succession by many building enterprises because it has distinguishing features such as can adapt to that the workyard is narrow and small, system height is big and speed of application is fast.Jack colony synchronisation control means is the key that can this operating technique guarantee construction qualities such as building squareness, at present domestic relatively more commonly used have three kinds: (one) stroke cap is adjusted method: it is by the adjusting to the jack stroke cap of climb in the system very fast (slowly), reduce (increase) its stroke, the step pitch of climbing of each jack is reached unanimity.Need through repetitious artificial adjustment generally speaking, the beginning can get a desired effect.The shortcoming of this method is to be used for large-area construction.(2) spacing control method: the jack that limits the absolute altitude that climbs earlier by spacing card and limit valve (forked type cover) control jack oil-feed (or make it can not oil extraction) continues to climb, thereby makes all jacks all reach the height of same demarcation.Generally rises sliding that per 300～500mm need establish control surface one on the direction, and with manually moving spacing card repeatedly, so that full construction process implementation actv. is controlled.Its operation is gone up simpler and can be used for the larger area construction than first method, and not enough is that control accuracy is not high, and particularly jack produces permanent deformation because of the overproof template system that causes when the no show control surface sometimes.(3) liquid level control method: utilize the principle of liquid level unanimity in the permeator, under the control of liquid level switch, electromagnetic valve can open or close the oil circuit of jack, concentrates at the employing microcomputer and can realize automation under the control and can reach very high precision.Control system complexity, components and parts expense height, maintenance management difficulty are the shortcomings that this method exists.Above content is referring to " hydraulic climbing form work engineering design and construction " (in October, 1984 publication) of the chief editor of Sichuan Province building research station.This several method is to the seventies basic development maturation just, and up to having not yet to see the report with substantial progress, this has influenced further developing of this operating technique to a large extent.

The objective of the invention is under avoiding adopting the prerequisite of electric class, electrical type control convenience, to solve the technical barrier of jack colony synchro control in the engineering as far as possible; On the basis of improving control accuracy and reliability, realize the automation of control, thereby guarantee the construction quality of building structure with the most economic means.

This machine has the different of essence with existing jack.Be equipped with one and overlap the measure and control device that its step pitch of climbing is carried out automatic adjusting on the agent structure of this machine, when jack promoted operation, its adopted close-loop control mode establishing criteria to promote the operation of step pitch automatic adjusting.When whole climbing form system all during this jack of equipment, because each jack all climbs according to same standard step pitch, so can realize its colony synchronous in position (displacement).

The working portion of this machine can adopt the agent structure of existing various jacks, only need control annexes such as the original stroke adjustment cap of cancellation, forked type cover, replaces a cover automatic measurement and control device.This device combines by promoting step pitch testing agency and forced stroke control cock two parts, and its major part has friction rolling measuring pulley, proportion expression feedback cam, mounting system, follower lever, proportion expression valve core assembly, valve body etc.Roller is pressed on the cramp bar surface by the hold-down mechanism in the mounting system, and the friction force that produces in the contact site makes roller drive this surface, lower edge at jack and makes non-sliding rolling.Cam and tolling measurement wheel is same wheel construction, can take turns (calling roller in the following text) at tolling measurement and drive rotation down, thereby change the contour dimension of itself and follower lever contact site.Follower lever can slide up and down certain distance in valve body, its top forms higher pair with cam working face and contacts.Valve core also can slide in valve body, and piston or piston rod movement promote valve core oil outlet passage is closed to certain position in the oil extraction process.Because having only so-called band to carry, the special-purpose jack that uses in the engineering switches this a kind of bearing mode of supporting jaw, when changing card, there is inevitable sliding phenomenon, and the slippage difference that produces under the different load actions, but the slippage that produces under the rated load effect depends on the version of dop, and we are referred to as the structure slippage at this.If the structure stroke of jack cylinder is certain, then the step pitch of climbing under rated load is also for certain value, and the slippage of the step pitch of climbing of the jack forced stroke that equals oil cylinder and the trip generation poor generally speaking.The design with the step pitch of climbing that produces under the rated load as the standard of weighing each jack step pitch deviation size, and the standard that the is referred to as step pitch of creeping, and make the integral multiple of the girth of roller for this standard step pitch.Be to guarantee survey precision, the diameter of the prerequisite bottom roller that allows in structure is the bigger the better.The parameter of cam working face becomes the certainty ratio relation with the deviation of the step pitch of climbing that roller records, and the number of cam working face encloses long multiple with roller and equates also rectangular distribution.Follower lever has been accepted residing position after the proportional feedback of cam, just in time controls valve core and closes oil outlet passage in good time, distance and the numerically equal of survey deviation that the oil extraction stroke of jack is shortened.Displacement characteristic during the valve core action is: it has the ratio that becomes reciprocal relation with feedback proportional.Jack will shorten its next forced stroke owing to the oil extraction stroke shortens like this, thereby make its each step pitch of climbing all adjust by the way in being right after next time climbing thereafter and become and the numerically equal of standard step pitch.

Valve body can adopt the integral structure that combines with jack, as process valve body on cylinder cap, also can adopt the sectional construction of independent moulding, so that the use of some heavy jacks, and can realize seriation.No matter any structure generally except that oil main line is arranged, all need be offered the kinetic balance oil duct that keeps follower lever steadily sliding.

Because this jack is not by the centralized control link it to be carried out error measure and control, but all according to unified standard the adjusting of step pitch of himself is realized that colony is synchronous by each jack.So need not other any aspect of existing form work engineering is changed, also unrestricted to the quantity of the jack that adopts, be particularly suitable for the application of large tracts of land engineering.With respect to the control method that microcomputer system is arranged, the consumption of its jack is big more just can bring into play preceence of the present invention more.The control accuracy height of this control setup, synchronous error shows as the absolute error limit invariable (generally can remain in 8～15mm) in theory, and simple in structure, manufacturing, use, maintenance, convenient management, cost are also relatively low.

Fig. 1 is the scheme drawing of embodiment, and it shows a kind of small-sized very heavy structure that adopts integral structure.Fig. 2 be along A among Fig. 1 to structural representation.

This machine is made up of agent structure A and measure and control device B two parts.Its measure and control device comprises friction rolling measuring pulley (1), proportion expression feedback cam (2), follower lever (3), proportion expression valve core assembly (5), mounting system (4), valve body major parts such as (6).Piece number among the figure (7) refers to cramp bar.

Roller (1) and cam (2) are fixed on the jack main body A by mounting system (4), and the hold-down mechanism on the support is pressed on the cramp bar (7); Follower lever (3) is installed on the valve body (6) with valve core (5), and valve body constitutes the part of cylinder cap simultaneously.Carrying out N when promoting action, roller is driven by jack, measures the deviation of this step pitch of climbing in the mode of friction rolling, and cam is given follower lever with this deviate by 2: 1 proportional feedback, and the bottom of follower lever is the valve core assembly.During the oil extraction action, piston motion is when having the position of equal amount with measured deviation from home, promote valve core and compress valve seat, close oil outlet passage, the motion characteristic of this valve core group is 1: 2, at this moment the N time action is all over, the oil extraction Sn in shortage that consequently has step pitch deviation △ N and equate with it.When carrying out N+1 lifting action, on oil extraction Sn in shortage will show that the step pitch of climbing reduces in the mode that forced stroke shortens, and the amount of this minimizing equates with △ N, has also promptly realized adjusting to N the step pitch of climbing; The deviation that produces in the N+1 process is then adjusted by the process of N+2 in the same way.Wherein sequence number N represents to promote number of times.Hold synchronous situation for support directly perceived in addition, can on measuring pulley, install counting machine.

Claims (2)

1, a kind of step pitch self-synchronizing jack that is used for the hydraulic climbing form work engineering, the agent structure of this machine are that existing band carries the sliding formwork jack that there is sliding phenomenon in card body when switching, it is characterized in that, are equipped with on the agent structure:

A. promote step pitch testing agency, it comprises:

Friction rolling measuring pulley (1) reaches coaxial binding with it,

Proportion expression feedback cam (2) and support both and friction rolling measuring pulley (1) is pressed on the cramp bar (7) of agent structure;

Mounting system (4); And:

B. forced stroke control cock, it comprises:

Be subjected to the follower lever (3) of cam (2) control and control valve core (5);

Can be under the piston of jack or piston rod promote cooperate with follower lever (3) and valve body (6) the proportion expression valve core assembly (5) of closing oil outlet passage and,

Can make follower lever (3) keep the valve body (6) of balance and supporting valve core (5) motion;

Make this device when jack climbs operation, climb step pitch and close-loop control mode of establishing criteria promotes step pitch to each and carries out automatic adjusting.

2, step pitch self-synchronizing jack according to claim 1 is characterized in that: Detection ﹠ Controling mechanism can be arranged on the two ends of jack and measuring pulley (1) is easy to and the approaching position of cramp bar (7); Also Detection ﹠ Controling mechanism can be made independently valve body, link together with pipeline and jack, this moment, the installation site of this valve should make its friction rolling measuring pulley (1) and cramp bar (7) normal engagement.

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