CN2275239Y - Automatic equivalent speed rate load pressure tester - Google Patents
Automatic equivalent speed rate load pressure tester Download PDFInfo
- Publication number
- CN2275239Y CN2275239Y CN 96246526 CN96246526U CN2275239Y CN 2275239 Y CN2275239 Y CN 2275239Y CN 96246526 CN96246526 CN 96246526 CN 96246526 U CN96246526 U CN 96246526U CN 2275239 Y CN2275239 Y CN 2275239Y
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- China
- Prior art keywords
- oil
- plunger
- connects
- microcomputer
- valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model relates to an automatic equivalent speed rate load pressure tester which is used for the compression strength test of cement or concrete. The utility model is composed of a regulator which is controlled by a microcomputer and a motor which is used for controlling and driving a plunger oil pump, wherein an oil outlet of the plunger oil pump is connected with an electromagnetic valve, an oil filter, a transducer and an oil cylinder. The other end of the oil filter is connected with a throttle valve, and the other end of the transducer is connected with the microcomputer. The oil inlet of the plunger oil pump, the other end of the electromagnetic valve and the other end of the throttle valve are connected with an oil tank, and a valve core of the throttle valve is provided with a throttling groove. The microcomputer tests a pressure changing condition through the transducer and controls the rotating speed of the plunger oil pump, and realizes equivalent speed rate loading under the matching of the throttle valve. The utility model has the advantages of simple structure, low cost and good reliability.
Description
The utility model relates to a kind of pressing machine that is used for cement or concrete crushing strength test.
The existing pressing machine that is used for cement or concrete crushing strength test adopts mostly by microcomputer control solenoid-operated proportional flow speed control valve, to realize speed pressurizations such as automatic.The deficiency of this system controlled by computer electromagnetism proportional velocity regulating valve system is, the complex structure of its solenoid-operated proportional flow speed control valve, and the requirement on machining accuracy height, the finished product ratio is low, and poor stability is adjusted and maintenance difficult, and is cost an arm and a leg, so be difficult to apply.
The purpose of this utility model is to remedying the deficiencies in the prior art, provide a kind of simple in structure, cost is low, reliability is high, its hydraulic system adopts improved throttling valve, adjust through disposable, with the rotating speed of system controlled by computer ram pump, the speed loading pressure testing machine such as automatic that can reach that speed such as force value rises.
The purpose of this utility model is to adopt following technical proposals to realize.
Whole pressure testing machine all adopts existing general combination of devices to form.Promptly assemble by components and parts such as fuel tank, plunger-type fuel pump, oil cylinder, solenoid valve, oil filter, throttling valve, motor, speed regulator and microcomputer, D/A, mould/number conversion and sensors.
Technological thought of the present utility model is, through the sensor pressure changing, realizes the closed-loop control pump speed by microcomputer, and effectively cooperates at throttling valve and the speed loading such as to be issued to.Its design feature is to be used for the motor of actuation plunger oil pump by microcomputer-controlled speed regulator control; The oil-out of plunger-type fuel pump connects solenoid valve, connects oil filter, connects sensor, connects oil cylinder; The other end that the other end of oil filter connects throttling valve, sensor connects microcomputer; The other end of the oil-in of plunger-type fuel pump, the other end of solenoid valve, throttling valve connects fuel tank.
Be the stability of enhanced system work, the oil-out of plunger-type fuel pump also connects a throttling valve, and the other end of this throttling valve connects accumulator.
For obtaining the stable restriction characteristic of throttling valve, the spool outer end diameter surface of throttling valve is provided with the throttling channel of two symmetries, and the radially angle of throttling channel is 60-90 °, and its axioversion degree is 10-15 °.
The utility model has following tangible advantage and effect:
1, be existing general-purpose device entirely owing to what adopt, so simple in structure, assembling is easy, and cost is very low;
2, owing to having adopted the big earial drainage characteristic of common throttling valve, through the rotating speed of pressure transducer detection and system controlled by computer oil pump motor.Can realize the constant speed loading;
3, adopt the loading technology of software segmentation in the microcomputer, can reach the loading of 0.2KN/S, the precision control of speed;
4,, make motor can roll into a ball ring and follow the tracks of force value, thereby realized the pressure holding function of fixation pressure point by the system controlled by computer speed regulator.
Below in conjunction with drawings and Examples utility model is further described.
Fig. 1 is a general structure synoptic diagram of the present utility model.
Fig. 2 is the synoptic diagram that throttling valve valve seat of the present utility model and spool cooperate.
Fig. 3 is that synoptic diagram is looked in the left side of throttling valve spool of the present utility model.
1-motor among the figure, 2-plunger-type fuel pump, 3-fuel tank, the 4-solenoid valve, the 5-oil filter, 6 and 6 '-throttling valve, the 7-pressure transducer, the 8-microcomputer, 9-speed is counted display, 10-power value is counted display, 11-printer, 12-keyboard, the 13-speed regulator, 14-down pressing seat reduction of speed detectability bit switch, 15-down pressing seat lifting height detectability bit switch, 16-oil cylinder, the 17-piston rod, the 18-down pressing seat, 19-test block anchor clamps, 20-upper pressure seat, the 21-accumulator, 22-throttling valve valve seat, 23-throttling valve spool, 24-throttling channel.
As shown in Figure 1, motor (1) is by belt or shaft coupling actuation plunger oil pump (2), and plunger-type fuel pump (2) oil-out is connected with solenoid valve (4), oil filter (5), oil cylinder (16), sensor (7), throttling valve (6 ') through oil pipe.The other end of throttling valve (6 ') connects accumulator (21), and the other end of oil filter (5) is connected with throttling valve (6).The oil-in of plunger-type fuel pump (2), the other end of solenoid valve (4), throttling valve (6) is connected with fuel tank (3).The other end of sensor (7) is connected with microcomputer (8).Also have down pressing seat reduction of speed detector switch (14) that is provided with at the closed place of last down pressing seat (20 and 18) and detector switch (15), the speed that limits the down pressing seat lifting height that are connected with microcomputer (8) are counted the speed regulator (13) that display (9), power value are counted display (10), keyboard (12), printer (11) and controlled motor (1).
Throttling valve of the present utility model (6 and 6 ') is with throttling valve is different usually, be provided with the throttling channel (24) of two symmetrical distributions on the outer end diameter surface of its spool (23), its radially angle be 60-90 °, its axioversion angle is 10-15 °, and the length of throttling channel (24) generally should be equal to or greater than the external diameter of spool (23).
Plunger-type fuel pump of the present utility model (2) drives via motor (1), hydraulic oil is pumped into oil cylinder (16) from fuel tank (3), promoting piston and piston rod (17) and down pressing seat (18) rises, make the resistance to compression anchor clamps (19) that cement or concrete test piece are housed touch pressurized mutually with upper pressure seat (20), along with pressure raises, the signal of pressure transducer (7) is handled out force value and rate of loading value through amplification and mould/number conversion by microcomputer (8), sends into digital indicator (10 and 9) respectively and shows.Simultaneously, according to the speed size by microcomputer (8) through D/A switch, remove to control speed regulator (13), the rate of loading that motor (1) closed loop follow the tracks of to be set.Utilize microcomputer (8) control speed regulator (13) delivery rate that speed supercharging rule changes plunger-type fuel pump (2) such as in enough scopes, to press, can realize speed loadings such as full-automatic.Present embodiment is according to the requirement of force value measurement range and minimizing initial pressure, and speed ratio has reached 1: 30.The software subdivide technology has been adopted in the requirement that slow reading is examined slowly when satisfying gauging calibration, and speed governing resolution is brought up to 10
4More than the order of magnitude.With this understanding, can a bit follow the tracks of force value, realize pressure holding function at certain.Present embodiment utilizes the earial drainage characteristic of throttling valve (6 and 6 '), promptly work as orifice size, factors such as oil viscosity are fixedly the time, and vent flow is relevant with the square root of pressure, through rationally adjusting, can obtain the pump speed (being equivalent to flow) of a practicality and the relation curve of pressure.
Adjusting of throttling valve (6 and 6 ') will be left sufficient surplus, increases or oil viscosity still can reach the maximum, force value when descending in oily temperature guaranteeing.Install oil filter (5) additional to improve the stability of work at the preceding need of throttling valve (6).Solenoid valve (4) is used for quick relief under any state.As automatic testing process, be automatic quick relief when speed is born in the broken appearance of test specimen; Maybe when with proving ring nominal pressure precision, but off-load is forced in manually-operated.Accumulator (21) is the low frequency pulsating that is used to absorb plunger-type fuel pump (2).The effect of throttling valve (6 ') is when cement or concrete test block fragmentation, the unlikely instantaneous relase of energy in the accumulator (21), but slowly emit.Down pressing seat in the detection (20 and 18) closed position near switch (14), can be used to fast rise speed is reduced to about 1/10th, allow test specimen contact pressurized again.Near switch (15) is to be used for the lifting height of limited piston.The force value accuracy of detection is handled pressure transducer (7) nonlinear compensation by microcomputer (8), can bring up to ± more than 0.5%.Test result is pressed the standard format printout by mini-printer (11).Complete machine is realized parameter setting, turn on pump, pass pump, loading, off-load, operations such as inspection, peak value demonstration, printing as a result slowly by keyboard (12).Program possesses functions such as over pressure protection (103%), overcurrent protection (120%), the restriction of hypervelocity rate, with the machine damage that prevents that incorrect adjustment or maloperation from causing.
Present embodiment has reached the following technical indicator that is better than GB:
Power value scope: 30-300KN
Gamut precision: ± 0.5KN
Rate of loading: 2.4-5KN/S ± 3%
Slowly examine speed: 0.2KN/S
Claims (3)
1, a kind of speed loading pressure testing machine such as automatically, by fuel tank, plunger-type fuel pump, oil cylinder, solenoid valve, oil filter, throttling valve, motor, speed regulator, and set of data devices such as microcomputer, sensor form, and it is characterized in that: the motor (1) that is used for actuation plunger oil pump (2) by speed regulator (1 3) control of microcomputer (8) control; The oil-out of plunger-type fuel pump (2) connects solenoid valve (4), connects oil filter (5), connects sensor (7), connects oil cylinder (16); The other end of oil filter (5) connects throttling valve (6), and the other end of sensor (7) connects microcomputer (8); The other end of the other end of the oil-in of plunger-type fuel pump (2), solenoid valve (4), throttling valve (6) connects fuel tank (3).
2, by the described speed loading pressure testing machine such as automatically of claim 1, it is characterized in that: the oil-out of plunger-type fuel pump (2) also connects a throttling valve (6 '), and the other end of throttling valve (6 ') connects accumulator (21).
3, by claim 1 or 2 described speed loading pressure testing machines such as automatically, it is characterized in that: spool (23) the outer end diameter surface of throttling valve (6 and 6 ') is provided with the throttling channel (24) of two symmetries, the radially angle of throttling channel (24) is 60-90 °, and its axioversion degree is 10-15 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96246526 CN2275239Y (en) | 1996-11-08 | 1996-11-08 | Automatic equivalent speed rate load pressure tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96246526 CN2275239Y (en) | 1996-11-08 | 1996-11-08 | Automatic equivalent speed rate load pressure tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2275239Y true CN2275239Y (en) | 1998-02-25 |
Family
ID=33919078
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96246526 Expired - Fee Related CN2275239Y (en) | 1996-11-08 | 1996-11-08 | Automatic equivalent speed rate load pressure tester |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2275239Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101178346B (en) * | 2007-11-29 | 2010-06-23 | 江南大学 | Portable compression testing machine load application velocity checking apparatus |
| WO2012167499A1 (en) * | 2011-06-08 | 2012-12-13 | 长沙中联重工科技发展股份有限公司 | Pressure regulating method and system for a concrete pumping device and the concrete pumping device |
| CN103032421A (en) * | 2012-12-26 | 2013-04-10 | 中联重科股份有限公司 | Reversing hydraulic system, method for controlling same and concrete pumping equipment |
-
1996
- 1996-11-08 CN CN 96246526 patent/CN2275239Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101178346B (en) * | 2007-11-29 | 2010-06-23 | 江南大学 | Portable compression testing machine load application velocity checking apparatus |
| WO2012167499A1 (en) * | 2011-06-08 | 2012-12-13 | 长沙中联重工科技发展股份有限公司 | Pressure regulating method and system for a concrete pumping device and the concrete pumping device |
| CN103032421A (en) * | 2012-12-26 | 2013-04-10 | 中联重科股份有限公司 | Reversing hydraulic system, method for controlling same and concrete pumping equipment |
| CN103032421B (en) * | 2012-12-26 | 2015-04-22 | 中联重科股份有限公司 | Reversing hydraulic system, method for controlling same and concrete pumping equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |