Fatigue tester for pressure instruments
The utility model relates to a kind of hydraulic machinery, and more particularly, it relates to a kind of efficient, the fatigue tester for pressure instruments that the life-span is long.
Fatigue tester for pressure instruments is used to as the instrument such as high-precision pressure gauge, stainless steel pressure table carry out low pressure test, the test of high pressure pressure and the tired Alternating Test of low pressure and the tired Alternating Test of high-pressure, the object of boosting and step-down is reached by pneumatic element do action, drive related device (manometric bourdon tube) to do tired action, reach the object of detected pressures table.
At present, (application number is that the Chinese patent of CN91221600.X discloses a kind of fatigue tester for pressure instruments) on market, it comprises a power source, and this power source is made up of a drive motor and a speed reduction unit; Two or a reciprocating plunger pump, the Level Planar Mechanism bar bar group that this ram pump is made up of a plane III grade of bar bar is formed; A fixed ampllitude device, this device is made up of an accumulator and two retaining valves; A stable-pressure device, this device is made up of a hydraulic pump, a pressure valve and a surplus valve.Although this fatigue tester for pressure instruments can complete torture test, its complex structure, pipeline easily damages, inconvenient maintenance, the medium of the boosting adopted is fluid, and easily produce pollution, the torture test that apparatus can not meet modernization manometer require that.
Utility model content
For the deficiency that prior art exists, the purpose of this utility model is to provide the fatigue tester for pressure instruments of a kind of efficient, environmental protection, experiment automatically.
For achieving the above object, the utility model provides following technical scheme: a kind of fatigue tester for pressure instruments, comprises pneumatic circuit, and it is in series by air inlet source, pressure regulator valve, low pressure gauge, solenoid valve, supercharger; Hydraulic circuit, it is in series by high-pressure hydraulic pump, retaining valve, inlet valve, Draw off valve, and described inlet valve is connected with pressure tapping, blowout-back pressure gauge, supercharger jointly with the pipeline between Draw off valve; Control circuit, is connected with solenoid valve.
Preferably, described solenoid valve is two-position-five-way solenoid valve.
Preferably, described pressure tapping is provided with multiple.
Preferably, described control circuit comprises multiple on-off element, relay element, time relay element, is also connected with alarm lamp in described control circuit.
Preferably, the power end of described control circuit connects ground connection after supercharging switch, the 5th relay successively; Starting switch is connected with shutdown switch with after the first relay normally open contact parallel connection, and the described shutdown switch other end and ground are connected with functional circuit between holding.
Preferably, described functional circuit is by the experiment of pilot relay time delay automatic Regulation.
Compared with prior art, the beneficial effects of the utility model are: by arranging pneumatic circuit, hydraulic circuit, control circuit, realizes the adjustment of automatic function, realizes the torture test of efficient manometer, improve on the whole, eliminated and originally utilized fluid as the design of medium, adopt clean water as medium, clean environment firendly is pollution-free, utilizes control circui simultaneously, and practical function is complete, automaticity is high, structure optimization, designs ingenious, and precision and the speed of experiment are all improved.
Accompanying drawing explanation
Fig. 1 is the equipment appearance structural drawing of the utility model fatigue tester for pressure instruments embodiment;
Fig. 2 is the hydraulic pressure air pressure pipeline jointing construction schematic diagram of the utility model fatigue tester for pressure instruments embodiment;
Fig. 3 is the electrical block diagram of the utility model fatigue tester for pressure instruments embodiment.
In figure 1, air inlet source, 2, pressure regulator valve, 3, low pressure gauge, 4, solenoid valve, 5, supercharger, 6, high-pressure hydraulic pump, 7, retaining valve, 8, inlet valve, 9, Draw off valve, 10, pressure tapping, 11, blowout-back pressure gauge, K1, supercharging switch, K2, starting switch, K3, shutdown switch, K4, pump switch, SJ1, very first time relay, SJ2, second time relay, C1, the first relay, C2, the second relay, C3, the 3rd relay, C4, the 4th relay, C5, the 5th relay, F1, pressure charging valve, F2, blowdown valve.
Referring to figs. 1 through Fig. 3, the utility model fatigue tester for pressure instruments embodiment is described further.
As shown in Figure 1, the manometer doing pressure fatigue test is needed to be arranged in pressure tapping 10, fatigue tester for pressure instruments can be used for as high precision, stainless steel pressure table etc. carry out low pressure test, high-pressure test and the tired Alternating Test of low pressure and the tired Alternating Test of high-pressure, a tractor serves several purposes, table top and pipe gas circuit and pressure tapping 10 all adopt stainless steel to make, long service life.
As shown in Figure 2, a kind of fatigue tester for pressure instruments, comprises pneumatic circuit, is in series by air inlet source 1, pressure regulator valve 2, low pressure gauge 3, solenoid valve 4, supercharger 5; Hydraulic circuit, be in series by high-pressure hydraulic pump 6, retaining valve 7, inlet valve 8, Draw off valve 9, by controlling pneumatic element do action with boosting and pressure release, drive and need the tensimeter doing torture test, described inlet valve 8 is connected with pressure tapping 10, blowout-back pressure gauge 11, supercharger 5 jointly with the pipeline between Draw off valve 9; Control circuit, is connected with solenoid valve 4.By control circuit automatically for completing torture test work, adopt high-performance high-pressure hydraulic pump 6, stainless valve, can ensure that equipment works reliably and with long-term.Adopt above connection, use water is high-pressure medium, without oil pollution, and clean environment firendly more.Solenoid valve 4 is two-position-five-way solenoid valve 4, coordinates control circui, is also connected with sound and light alarm on the control circuitry, meets hommization requirement.
As shown in Figure 1, pressure tapping 10 is provided with multiple, can do experiment for multiple manometer simultaneously, can save the running time, improves the efficiency of inspection.
As shown in Figure 3, described control circuit comprises 4 switches, 5 relays, 2 time relays, is also connected with alarm lamp in described control circuit.Described control circuit power end is in series with supercharging K switch 1, the 5th relay C5 coil ground connection again; Starting switch K2 is connected with shutdown switch K3 normally closed contact with after the first relay C1 normally opened contact parallel connection, and the described shutdown switch K3 normally closed contact other end and ground are connected with functional circuit between holding.Described functional circuit is by the experiment of pilot relay time delay automatic Regulation.Functional circuit as shown in Figure 3, at the shutdown switch K3 normally closed contact other end, the first relay C1 coil ground connection of connecting after the normally closed contact of the second time relay sj 2 of connecting; Ground connection after series connection very first time relay SJ1; Connect after series connection very first time relay SJ1 normal open switch the second time relay sj 2 ground connection, the second time relay sj 2 is in parallel with alarm lamp; After 4th relay C4 normally opened contact is in parallel with the 5th relay C5 normally opened contact with the second relay C2 coils connected in series after ground connection; 4th relay C4 normally closed contact is connected with the 5th relay C5 normally closed contact afterwards and ground connection after the 3rd relay C3 coils connected in series; Ground connection after second relay C2 normally opened contact and pressure charging valve F1 coils connected in series; Ground connection after 3rd relay C3 normally opened contact and blowdown valve F2 coils connected in series.Simultaneously power end connect with high-pressure hydraulic pump 6 after connecting with supercharging K switch 1 after ground connection; Ground connection after power end and supercharging K switch 1 normally closed contact are connected with the 4th relay C4 coil after connecting.
Pass through said structure, when pressing starting switch K2, first relay C1 coil, very first time relay SJ1 coil, 3rd relay C3 obtains electric, thus make the first relay C1 normally opened contact, 3rd relay C3 normally opened contact closes, circuit realiration self-locking, blowdown valve F2 relay coil must establish beginning pressure release by cable, wait for that the very first time relay SJ1 tired time one arrives, very first time relay SJ1 normally opened contact closes, second time relay sj 2 coil obtains electric, alarm lamp is bright, wait for that time of fire alarming one arrives, second time relay sj 2 normally closed contact disconnects, first relay C1 coil losing electricity, down circuitry, equipment test terminates.Simultaneously by pressing supercharging K switch 1 in the process of test, 5th relay C5 coil obtains electric, 4th relay C4 coil losing electricity, 5th relay C5 normally opened contact closes, the second relay C2 is made to start electric, second relay C2 normally opened contact is closed, and pressure charging valve F1 coil obtains electric, starts supercharging.Pump switch K4 controls high-pressure hydraulic pump 6 start and stop, realizes the water inlet of waterway pipe and discharges water, pressing the operation that shutdown switch K3 can realize forced stoppage.Very first time relay SJ1 is digital display time relay, is achieved the function control overflow of torture test by on-off element, and circuit is simple, and digital display time relay person easy to use intuitively sees the tired time.From tape light on switch, this is prior art, and each components and parts market is easily chosen, and controls rationally.
The above is only preferred implementation of the present utility model, protection domain of the present utility model be not only confined to above-described embodiment, and all technical schemes belonged under the utility model thinking all belong to protection domain of the present utility model.It should be pointed out that for those skilled in the art, do not departing from the some improvements and modifications under the utility model principle prerequisite, these improvements and modifications also should be considered as protection domain of the present utility model.