CN2239027Y

CN2239027Y - Detector for safety valve

Info

Publication number: CN2239027Y
Application number: CN 95222042
Authority: CN
Inventors: 廖璋
Original assignee: No1 Chemical Works Beijing Yanshan Petrochemical Co
Current assignee: No1 Chemical Works Beijing Yanshan Petrochemical Co
Priority date: 1995-09-22
Filing date: 1995-09-22
Publication date: 1996-10-30
Anticipated expiration: 2005-09-22

Abstract

The utility model relates to a detector for safety valves, which comprises a force application frame, a force application system and a data processor. The utility model is characterized in that the oil pump and an oil cylinder on the force application frame are connected by a high pressure flexible pipe; the force application frame and the data processor are connected by conducting wires and contact terminals to form a whole. The applied force adopts two methods of hand lever lifting or miniature high-pressure oil pump lifting. The utility model is connected with the microcomputer to form the detecting network for safety valves and satisfies the requirement of the large detection network dots.

Description

A kind of safety valve detecting device

What the utility model was related is a kind of safety valve detecting device, especially a kind of safety valve detecting device that utilizes the contact switch method to judge valve opening.

At present, the domestic and international method that context of detection adopted at safety valve mainly contains two kinds: a kind of is safety valve to be placed carry out the pressurising measurement on the conventional safety valve testing platform; Another kind is to measure under the compelling force effect.The measurement that the system band carries out when pressing is hot measurement, and the cold conditions that is measured as that system does not carry out when pressing is measured.Cold conditions is measured and is judged that the method for opening is that the turning point position when safety valve spring rigidity changes is judged according in the process that increases extraneous lifting force.It is a pure break in theory, but in fact measured be a kind of broken line of rounding off mostly, therefore can not strictly ask the opening point of safety valve.In general, this series products has error about 10% mostly both at home and abroad.The patented product that we were applied in the past (89208448.4) promptly uses a computer and finds the solution, and yet has 2% systematic error.As for the result of hot measurement, existing product all has with a kind of systematic error.Safety valve is opened moment at it, valve rod does not rise, but form in the formed pneumatic trough between regulating ring and the flap down certain on the valve rod kick action of just rising after the thrust, therefore, safety valve is after opening point, generally all exist a kick point, these two points overlap sometimes, and obvious difference is arranged again sometimes.The value of hot measurement is actually the kick point after the unlatching, is not real opening point.When used instrument hydraulic pressure lift speed not simultaneously, can directly have influence on the kick point size of being surveyed, error is more than 5%.Present widely used safety valve testing platform all has certain defective, especially measure little when opening the safety valve that valve or two-part open, more obvious.For example in the process of boosting, descend or stagnate when motionless when gauge hand shows, safety valve is opened already, only reached fill, the mobile equilibrium of exhaust.Operating personnel control the formed exhaust clearance of aeration speed and flap and valve seat and affect stagnation point jointly more precisely.Therefore, different operating personnel's technical quality and custom cause bigger influence all will inevitably for the precision of measuring.In addition, safety on line valve detecting device in the past all is to adopt complicated heavy hydraulic pressure unit as the compelling force source, its device comprises flow control valve, reduction valve, reversal valve, accumulator, stop valve, tensimeter, oil pump and hydraulic module etc., and general assembly (TW) is usually more than 30 kilograms.The data processing unit of safety on line valve detecting device mostly uses accurate swift electron register, not only heaviness but also be not easy to site environment and use.

The purpose of this utility model is to propose a kind of contact switch method of utilizing to judge the safety valve detecting device that safety valve is opened, and fundamentally overcomes the shortcoming of above-mentioned safety valve detecting device.

The safety valve detecting device that the utility model proposed is to utilize flap to drive a contact, and fixed underpan is as another contact.When safety valve was opened, two contacts changed to off-state from closure state.The data acquisition of forming by single-chip microcomputer, the ON-OFF state that processor is judged contact switch automatically, thereby the opening pressure of finding the solution.Whole safety valve detecting device is made up of application of force framework, force application system and data processor three parts.Being constructed as follows of application of force framework: the base of an adjustable aperture (2) is installed on the valve body of safety valve to be measured (1).Fix with three Φ 8 screws that are mutually 120 °.Two root posts (10) are inserted in the both sides of base (2) symmetrically, pin with pin (15) in the bottom.Upper end in two columns (10), it is spacing with it to insert a crossbeam (6), and pins with pin.According to the concrete structure size of safety valve to be measured (1), the different orifice of available column (10) is adjusted to different height with crossbeam (6).Constituting of force application system: the oil cylinder (7) that produces hydraulic coupling is fixed on the crossbeam (6), oil cylinder (7) has an annular hydraulic plunger, link rod (8) passes from the endoporus of annular plunger, a link rod nut (9) is installed in the upper end of link rod (8), when the annular hydraulic plunger of oil cylinder (7) rose, hydraulic coupling affacted on the link rod (8) by link rod nut (9).A dynamometer (5) is equipped with in the lower end of link rod, by coupling nut (4) institute's externally applied forces directly is added on the valve rod of safety valve (1).When the valve rod of safety valve (1) applied the outer liquid pressure that makes progress, the column in the application of force frame system (10) was subjected to a downward equivalent acting force.The output terminal specialized designs of high-pressure oil pump (12) a stealthy tubular type damper, the high-voltage tube that has rapid-acting coupling with two ends between high-pressure oil pump (12) and the oil cylinder (7) connects.When adopting manual mode to apply external force, use hand hoisting bar (11), its arm of force ratio is 14: 1.Under normal conditions, if can steadily controllably apply 30Kg external force with arm strength the time, can obtain the lifting force of about 400Kg on the valve rod.For guaranteeing that the valve rod lifting force can be concentric with valve rod, have an annular pivot slot in the upper surface of oil cylinder (7), to guarantee that when packing hand hoisting bar (11) into the line of two points of force application is by the axis of link rod (8).In addition, the point of force application of spherical structure has also guaranteed above-mentioned proper alignment; Data processor (14) adopts the most novel current single-chip microcomputer to make microprocessor, have big screen LCD (LCD), can carry out man-machine conversation and procedure for displaying curve, show test data, and be furnished with tactile keyboard and micro-printer, it is 0.05% microsensor that dynamometer adopts a kind of precision, utilizes one group of quad to connect with data processor (14).Have the terminals of a contact terminal (16) as contact switch on the base (2), another contact switch wiring is contact terminal (13), utilizes two leads that this two-terminal is linked to each other with application specific processor (14).Contact terminal support (3) is custom-designed, can be used for valve rod Φ 6～Φ 30mm or bigger safety valve.When support is installed near safety valve, the stability of rocking unlikely influencing contactor terminal that is produced when guaranteeing application of force frame stressing.In order not disturb mutually in two terminals (16) and (13) that prevent contact switch, support (3) is a mutual insulating with contact terminal (13).

The used data processor of the utility model is the pocket exclusive data processor of a kind of 150 * 80 * 50mm, compelling force adopts the hand lever formula to promote or miniature oil pump promotes dual mode, its machinery mount has also been done bigger improvement, and volume and weight has had significantly and reduces.In addition the utility model product also can with the microcomputer coupling, form the safety valve testing network, satisfy the needs of large-scale detection site.For the microcomputer of being furnished with the safety valve database, the utility model product can be used as the anteposition instrument, forms safety valve testing, management system.

Accompanying drawing is the utility model safety valve detecting device synoptic diagram.

Carry out safety valve when detecting, earlier chassis (2) are fixed on the shell of safety valve to be measured (1), oil cylinder (7) is installed to after crossbeam (6) goes up, load onto column (10), crossbeam (6) and pin (15) more successively.Contact holder (3) is enclosed within on the valve rod of safety valve (1) and locks.Load onto coupling nut (4), dynamometer (5) and link rod (8) successively.After being adjusted to a suitable position, crossbeam (6) is fixed on the column (10) with pin.When adopting manual force to promote, lever hand hoisting device (6) is inserted in appropriate location between link rod nut (9) and the oil cylinder (7), forms an arm of force ratio and be 14: 1 lever force application system.When adopting hydraulic coupling to promote, high-pressure mini oil pump (12) is coupled to oil cylinder (7) by a high-pressure hose that has rapid-acting coupling, the output terminal of this high-pressure oil pump (12) is equipped with special damper, to improve its output characteristics.Custom-designed single-chip data acquisition and processor (14) do not need external power supply, and its input end is from 0～5V analog quantity output of dynamometer (5).Another input end is the output of contact switch amount.Terminal (13) and (16) constitute two of this contact switch amount and draw the utmost point, and test mode and process all are presented on the lcd screen of data processor (14) with curve form.

Claims

1. safety valve detecting device of forming by application of force framework, force application system and data processor three parts, it is characterized in that: link to each other by a high-pressure hose between the oil cylinder on the application of force framework (7) and the high-pressure oil pump (12), link to each other with contact terminal (13), (16) by lead between application of force framework and the data processor, form an integral body.

2. safety valve detecting device according to claim 1 is characterized in that: its application of force framework comprises base (2), two root posts (10) and a crossbeam (6) of an adjustable aperture; Adjustable aperture base (2) is to be fixed on the valve body of safety valve to be measured with screw, and two root posts (10) are inserted in the both sides of base symmetrically, and pin with pin (15) bottom, and it is spacing with it that crossbeam (6) is inserted in the upper end of two columns, and pins with pin.

3. safety valve detecting device according to claim 1 is characterized in that: its force application system comprises the oil cylinder (7), link rod (8) and the high-pressure oil pump (12) that have annular hydraulic plunger; Link rod (8) passes from the endoporus of annular plunger, and a link rod nut (9) is equipped with in the upper end of link rod (8), and a dynamometer (5) and coupling nut (4) are equipped with in the lower end of link rod.

4. safety valve detecting device according to claim 1 is characterized in that: the output terminal specialized designs of force application system mesohigh oil pump (12) a stealthy tubular type damper; Be connected with a high-voltage tube between high-pressure oil pump (12) and the oil cylinder (7), there is an annular pivot slot upper surface of oil cylinder (7).

5. safety valve detecting device according to claim 1 is characterized in that: a manual lifting arm (11) is arranged in the force application system, can apply external force manually.

6. safety valve detecting device according to claim 1 is characterized in that: contact terminal support (3) is a mutual insulating with contact terminal (13).