CN2095422U - Electronic injection resistance meter for concrete - Google Patents
Electronic injection resistance meter for concrete Download PDFInfo
- Publication number
- CN2095422U CN2095422U CN 91203903 CN91203903U CN2095422U CN 2095422 U CN2095422 U CN 2095422U CN 91203903 CN91203903 CN 91203903 CN 91203903 U CN91203903 U CN 91203903U CN 2095422 U CN2095422 U CN 2095422U
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- concrete
- amplifier
- piezoelectric sensor
- load sensor
- measuring head
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Abstract
The utility model discloses an electronic injection resistance meter for concrete, comprising a piezoelectric sensor (1), an amplifier (2), an A/D conversion decoder (3) and a display (4) which are communicated in series and are respectively supplied with the electric source by a direct-current electric source transformation device (5). A signal latch (6) which is provided is communicated with the A/D conversion decoder (3), and a zero adjusting device (7) which is arranged and comprises a plurality of loops of potentiometers with high precision is communicated with the piezoelectric sensor (1). The utility model has the advantages of simple structure, convenient operation, high precision, convenience for carrying, wide measurement range and direct-viewing reading, being widely suitable for the indoor test and the job site of the concrete (comprises the normal concrete and the rolling concrete).
Description
The utility model belongs to concrete construction building technical field of measurement and test, fast, accurately measures concrete (containing normal concrete and the roller compacted concrete) electronic device of setting time in particularly a kind of concrete construction site.
Present existing concrete penetration resistance testing tool all is based on normal concrete and roller compacted concrete external varying in size of mechanical impedance in variant time in condensation process, and in the slurry condensation process, to the impedance of external force this feature of obvious variation will take place by coherent structure and determine its presetting period when crystalline texture changes.Bathroom scale formula concrete penetration resistance instrument is in the different time, utilizes external force that chaining pin is pressed into certain depth, weigh up the size of the external force that applies simultaneously with platform scale, being ordinate with external force (F) then, is horizontal ordinate to last (h), draws penetration-resistance curve and determines the presetting period.Machinery automatic hydraulic formula concrete penetration resistance instrument, be in the different time, to add external force automatically chaining pin is pressed into certain depth by hydraulic pressure, indicate the size of the external force that applies simultaneously with pointer pressure, draw penetration-resistance curve then and determine the presetting period.Because concrete is very little to the impedance of external force in the starting stage of condensing, the measured error of platform scale and tensimeter is very big, and the determined thus presetting period is difficult to satisfy the quality requirements of roller compacted concrete site operation.Particularly mechanical automatic hydraulic formula resistance instrument can only be fixed on indoor certain position, can't take out of outdoor.Though the testing tool of bathroom scale repacking can be moved, heavy, move also very inconveniently, thereby they use relatively difficulty at the construction field (site).
The utility model is exactly a kind of quality requirements that can satisfy the roller compacted concrete site operation of developing at above-mentioned situation, the concrete electronics penetration resistance instrument that can be convenient for carrying again.
The utility model is made of piezoelectric sensor (1), amplifier (2), A/D conversion code translator (3) and the connection of display (4) serial connection successively.They are respectively by DC power convertor (5) supply power, and are provided with a zeroing device (7) and are connected with sensor (1), are provided with a signal latch (6) and change code translator (3) with A/D and be connected.Its whole working is as follows: the detected concrete sample adds on the signal amplifier (2) after piezoelectric sensor (1) is transformed into voltage signal, deliver to A/D conversion code translator (3) zoom into the normal voltage signal of 0～2V through amplifier after, here be transformed to and the corresponding decimal system number of input voltage, directly send display (4) can obtain tested force value.It is the zero point drift that is caused by sensor under different environment for use conditions in order to eliminate that zeroing device (7) is set, and to reduce measuring error, improves measuring accuracy.The zeroing device is selected high-precision multiturn potentiometer for use.Signalization latch (6) can be preserved tested pressure signal, is convenient to measuring operation finish back reading and record, this value can be retained to always measure or manual reset next time.
According to the concrete electronics penetration resistance instrument of the utility model manufacturing have simple in structure, easy to use, measuring accuracy is high, measurement range is wide, reading is directly perceived, portable advantage, can be widely used in concrete shop experiment and working-yard.
Accompanying drawing 1 is a theory diagram of the present utility model.Accompanying drawing 2～6th, a specific embodiment of the present utility model, accompanying drawing 2 is the basic block diagram of piezoelectric sensor (1).Sensor (1) is by control lever (8), load sensor (11), measuring head (12) and automatically measuring switch parts such as (9) constitute.Wherein control lever (8) injection support cover (13) passes the end flexible connection of spring (10) and load sensor (11).Load sensor (11) can be selected commercially available semiconductor or strain-type load sensor for use, and its other end and measuring head (12) flexibly connect.Bearing disc (14) is a test panel with holes, when measuring head (12) pressurized, can conveniently pass bearing disc (14) and enter in the concrete, and its skewer is gone into the concrete degree of depth and can be regulated in 5～25mm.Support cover (13) is connected with bearing disc (14) and with measuring head (12), load sensor (11), spring parts shades such as (10).One automatic measuring switch (9) is arranged in the upper end of support cover (13), when depressing control lever and put in place, can connect automatic measuring switch (9) pressure signal is sent by signal output part button (15) after load sensor (11) conversion, thereby make this instrument show measured value (accompanying drawing 3 is the amplifier-chain schematic diagram) automatically.Amplifier (2) is made up of preposition differential amplifier (16) and battery check circuit (17).Preposition differential amplifier (16) is constituted by core with high precision integrated operational amplifier IC1.With it directly is connected load sensor (11) arranged, zeroing device (7) and battery check circuit (17), its major function is to accept to give A/D conversion code translator (3) after faint differential voltage signal that load sensor (11) sends amplifies, two input ends at integrated operational amplifier IC1 are connected to one group of resistance capacitance parallel circuit R1C1 and R2C2 respectively, in order to High frequency filter; Be serially connected with a W2R5 series circuit at its output terminal, in order to adjust output voltage amplitude, make the shown digital value of display (4) directly corresponding with force value, its output valve can make it connect battery check circuit (17) and A/D conversion code translator (3) and display (4) respectively by a K switch 1.When 1 group of K switch when battery is checked shelves, can connect battery check circuit (17), to check the height (accompanying drawing 4 is a signal automatic locking storage schematic circuit) of cell voltage.Signal automatic locking storage (6) is by integrated double single steady circuit IC2 and D6, D7, and R7 constituted or door is formed.When the automatic measuring switch (9) on being contained in sensor was connected, a low level signal was exported in IC2 work, sent into A/D conversion code translator (3) and display (4) by D6, in order to start the A/D conversion, demonstrated tested force value.After signal, force value is held (accompanying drawing 5 is the schematic diagram of A/D conversion code translator and display).A/D conversion code translator (3) is made of monolithic three and 1/2nd A/D conversion decoding schemes.Display (4) is selected three and 1/2nd LCD for use.The input end of A/D conversion code translator (3) is connected with the output terminal of IC1, converts analog voltage signal to digital signal and be decoded into decimal number by it to be shown by LCD LCD; When first pin of the IC3 that is connected with the IC2 output terminal is low level, work.Signal is latched during high level.(accompanying drawing 6 is the DC power convertor schematic circuit, and wherein Fig. 6 a is 2.5V voltage stabilizing figure, and Fig. 6 b is 5V voltage stabilizing figure).DC power convertor (5) can adopt commercially available 4 joint dry cells through efficient oscillatory circuits and rectifying and wave-filtering be converted to ± 5V and+the 9V direct supply, for complete machine provides working power.
Claims (3)
1, a kind of by the concrete electronics penetration resistance instrument that piezoelectric sensor and electron device constituted, it is characterized in that: this instrument is made of piezoelectric sensor [1], amplifier [2], A/D conversion code translator [3] and the connection of display [4] serial connection successively.They are respectively by DC power convertor [5] supplying electric current, and are provided with a signal latch [6] and are connected with A/D conversion code translator [3]; Being provided with a zeroing device [7] that is made of the high precision multiturn potentiometer is connected with piezoelectric sensor [1].
2, concrete electronics penetration resistance instrument as claimed in claim 1, it is characterized in that: described piezoelectric sensor (1) is made of control lever (8), load sensor (11), measuring head (12) and automatic measuring switch parts such as (9), wherein control lever (8) injection support cover (13) passes the end flexible connection of spring (10) and load sensor (11), and the other end of load sensor (11) and measuring head (12) flexibly connect; Bearing disc (14) is a test panel with holes, when measuring head (12) pressurized, can conveniently pass bearing disc (14) and enter in the concrete, and its skewer is gone into the concrete degree of depth and can be regulated in 5～25mm.Support cover (13) is connected with bearing disc (14) and with measuring head (12), load sensor (11), spring parts shades such as (10).One automatic measuring switch (9) is arranged in the upper end of support cover (13), when depressing control lever and put in place, can connect automatic measuring switch (9) and make the utility model show measured value automatically.
3, as claim 1,2 described concrete electronics penetration resistance instrument, it is characterized in that: described amplifier (2) is made up of preposition differential amplifier (16) and battery check circuit (17), and preposition differential amplifier (15) is constituted by core with high precision integrated operational amplifier IC1, be connected to the RC parallel circuit that is used for High frequency filter at its input end, be connected to one group in order to adjust the W2R5 sequential circuit of output voltage values at its output terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91203903 CN2095422U (en) | 1991-03-14 | 1991-03-14 | Electronic injection resistance meter for concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91203903 CN2095422U (en) | 1991-03-14 | 1991-03-14 | Electronic injection resistance meter for concrete |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2095422U true CN2095422U (en) | 1992-02-05 |
Family
ID=49918320
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91203903 Withdrawn CN2095422U (en) | 1991-03-14 | 1991-03-14 | Electronic injection resistance meter for concrete |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2095422U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101231187B (en) * | 2008-01-31 | 2011-01-19 | 深圳先进技术研究院 | Measuring circuit and device for piezoelectricity induction type electronic weighing |
| CN103278388A (en) * | 2013-06-19 | 2013-09-04 | 福州大学 | Method and device for testing initial setting time of pavement concrete |
| CN110057718A (en) * | 2019-01-30 | 2019-07-26 | 天津大学 | The native presetting period rapid detection method of portable grinding coagulation and detector |
-
1991
- 1991-03-14 CN CN 91203903 patent/CN2095422U/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101231187B (en) * | 2008-01-31 | 2011-01-19 | 深圳先进技术研究院 | Measuring circuit and device for piezoelectricity induction type electronic weighing |
| CN103278388A (en) * | 2013-06-19 | 2013-09-04 | 福州大学 | Method and device for testing initial setting time of pavement concrete |
| CN110057718A (en) * | 2019-01-30 | 2019-07-26 | 天津大学 | The native presetting period rapid detection method of portable grinding coagulation and detector |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| 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 |