CN212932197U - Paper bridge bearing pressure measurement system for paper bridge competition - Google Patents
Paper bridge bearing pressure measurement system for paper bridge competition Download PDFInfo
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- CN212932197U CN212932197U CN202021993731.8U CN202021993731U CN212932197U CN 212932197 U CN212932197 U CN 212932197U CN 202021993731 U CN202021993731 U CN 202021993731U CN 212932197 U CN212932197 U CN 212932197U
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Abstract
The utility model provides a paper bridge bears pressure measurement system for paper bridge contest, the on-line screen storage device comprises a base, be equipped with pressure test platform on the base, still be equipped with the double bracing stand on the base, slide bar orbit fixer and handle fixed cross beam are established to the cover in proper order on the double bracing stand, wear to be equipped with the slide bar on the slide bar orbit fixer, the slide bar lower extreme is equipped with the holding down plate, the slide bar upper end links to each other with operating handle through the connecting rod, operating handle links to each other with handle fixed cross beam, be equipped with pressure test device between pressure test platform and the base. The method has the advantages of measuring the pressure changing in real time in the paper bridge weighing test and capturing the maximum bearing force of the paper bridge before crushing.
Description
Technical Field
The utility model belongs to machine-building and pressure measurement device field, concretely relates to paper bridge bears pressure measurement system for paper bridge tournament.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
When the paper bridge is tested in a paper bridge competition for the maximum bearing capacity, the traditional measurement method is that the test can be completed only by matching and coordinating a pressure device and a weighing device. Has the defects of complex operation and low efficiency. The common weighing or pressing device can realize stable weight or pressure measurement, but cannot measure the pressure which changes in real time, so that the maximum bearing force of the paper bridge before crushing cannot be captured in the paper bridge weighing test.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a solve above-mentioned problem, provided a paper bridge for paper bridge contest bears pressure measurement system, the utility model discloses a solve the pressure size that can't measure real-time change in the paper bridge weighing test, can't catch the technical problem of the biggest bearing capacity of paper bridge before the crush.
According to some embodiments, the utility model adopts the following technical scheme:
a paper bridge bearing pressure measurement system for a paper bridge tournament comprising: the base is provided with a pressure test bench, the base is further provided with double-support stand columns, the double-support stand columns are sequentially sleeved with a slide bar track fixer and a handle fixing cross beam, slide bars are arranged on the slide bar track fixer in a penetrating mode, the lower ends of the slide bars are provided with lower pressing plates, the upper ends of the slide bars are connected with an operating handle through connecting rods, the operating handle is connected with the handle fixing cross beam, and a pressure test device is arranged between the pressure test bench and the base.
In addition, according to the utility model discloses a paper bridge bears pressure measurement system for paper bridge tournament can also have following additional technical characterstic:
preferably, the pressure testing device comprises a weighing sensor, the weighing sensor is connected with an A/D converter, the A/D converter is connected with a microprocessor, and the microprocessor is connected with a direct current power supply.
Preferably, the microprocessor is further connected with a human-computer interaction system, and the human-computer interaction system comprises an LCD screen, a voice broadcaster, an operation key and a reset key.
Preferably, a groove is formed in the center of the base, a pressure sensor is placed in the groove, the pressure test board is fixed on the pressure sensor, and a paper bridge to be tested is placed on the pressure sensor.
Preferably, the lower pressing plate is connected with a sliding rod through a fixing screw, and the sliding rod is connected with the lower pressing plate and a connecting rod bearing.
Preferably, the weighing sensor adopts an HL-8 half-bridge type weighing sensor, and the A/D converter adopts a 24-bit high-precision A/D converter HX 711.
Preferably, the middle of the slide bar track fixer is provided with two through holes, and the slide bar penetrates through the two through holes of the slide bar track fixer.
Preferably, the operation keys comprise a zero clearing key I, a broadcast key II and a peeling key III.
Preferably, the A/D converter converts the converted digital signal into a digital signal through I2The C serial interface is transmitted to the MCU.
Preferably, the clock pin SCK and the data pin DOUT of the 24-bit high-precision a/D converter HX711 are connected to a digital I/O interface of the MCU.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model discloses a place the paper bridge that awaits measuring on pressure test platform, through setting up two support post, the support to slide bar and handle is realized to slide bar orbit fixer and handle fixed beam, realize exerting pressure in real time to the paper bridge through setting up handle and slide bar and pressure plate, until crushing, through setting up pressure testing device real-time testing pressure weight under pressure test platform, and then have the pressure size of realizing measuring real-time change in the paper bridge weighing test, catch the technological effect of the biggest bearing capacity of paper bridge before crushing.
Drawings
The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without unduly limiting the scope of the invention.
FIG. 1 is a schematic structural diagram of a paper bridge bearing pressure measuring system for a paper bridge competition according to the present invention;
FIG. 2 is a bottom layer structure diagram of the paper bridge bearing pressure measurement system for the paper bridge tournament of the present invention;
FIG. 3 is a schematic structural diagram of a control system of a paper bridge pressure measurement system for a paper bridge competition according to the present invention;
fig. 4 is a flow chart of the paper bridge bearing pressure measuring system for the paper bridge competition of the present invention.
Description of reference numerals:
in fig. 1-4, 1, a base; 2. a pressure sensor; 3. a pressure test bench; 4. double support columns; 5. a lower pressing plate; 6. a slide bar track fixer; 7. a slide bar; 8. a connecting rod bearing; 9. the handle is fixed on the beam; 10. an operating handle; 11. a groove; 12. and (7) a gasket.
The specific implementation mode is as follows:
the present invention will be further explained with reference to the accompanying drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
As shown in fig. 1-4, a paper bridge bearing pressure measurement system for paper bridge competition, includes base 1, be equipped with pressure test platform 3 on the base 1, still be equipped with double bracing stand 4 on the base 1, slide bar orbit fixer 6 and handle fixed cross beam 9 are established to the cover in proper order on the double bracing stand 4, wear to be equipped with slide bar 7 on the slide bar orbit fixer 6, slide bar 7 lower extreme is equipped with holding down plate 5, slide bar 7 upper end passes through the connecting rod and links to each other with operating handle 10, operating handle 10 links to each other with handle fixed cross beam 9, be equipped with pressure test device between pressure test platform 3 and the base 1.
This patent mainly comprises mechanical structure and measurement control system, and mechanical structure includes base 1, pressure sensor 2, pressure test platform 3, two support columns 4, lower clamp plate 5, slide bar orbit fixer 6, slide bar 7, connecting rod 8, handle fixed cross beam 9 and operating handle 10. The measurement control system mainly comprises a weighing sensor, an A/D converter, an MCU and a peripheral circuit based on the MCU, an operation key, a buzzer, an LCD display screen, a TTS voice broadcast module and a 5V low-voltage power supply. When the device works, the paper bridge to be tested is placed on the pressure test bench 3, the operating handle 10 is held by hand to apply pressure downwards until the paper bridge is crushed. The LCD display screen displays the real-time weight value and the maximum weight value, and voice broadcast of the maximum value is carried out through the TTS voice broadcast module. The weighing and measuring system has the advantages of high integration level, accurate test and capability of improving the test efficiency to a greater extent.
The mechanical structure comprises a bottom layer framework, a middle layer supporting framework and a pressure driving framework, wherein the bottom layer framework comprises a base 1, a pressure sensor 2 and a pressure test platform 3, the base 1 is located at the bottommost layer of the mechanical structure, the pressure sensor 2 is connected with the base 1 and the pressure test platform 3 through a gasket 12, and the pressure test platform 3 is used for placing a paper bridge to be tested. The middle layer supporting framework comprises double supporting upright posts 4 and a sliding rod track fixer 6, and the pressure driving framework comprises a lower pressing plate 5, a sliding rod 7, a connecting rod, a handle fixing beam 9 and an operating handle 10. The bottom of the double-support upright post 4 is connected with the base 1, and the slide bar track fixer 6 is fixed in the middle of the double-support upright post 4. The lower pressing plate 5 is connected with a sliding rod 7 through a fixing screw, the sliding rod 7 is connected with the lower pressing plate 5 and a connecting rod, a handle fixing beam 9 is fixed at the upper part of the double-support upright post 4, an operating handle 10 is fixed on the handle fixing beam 9, and the inner side of the end part is connected with the connecting rod.
The measurement control system comprises a pressure signal sampling analog-to-digital converter and a man-machine interaction system which take the MCU as a core, and a basic MCU peripheral basic circuit. The pressure signal sampling analog-to-digital converter (pressure testing device) comprises a weighing sensor and an A/D converter, the man-machine interaction system comprises an operation key, a buzzer, an LCD display screen and a TTS voice broadcast module, and the MCU and the peripheral circuit based on the MCU comprise a power supply, a reset circuit, a reference clock signal circuit and a basic key. The weighing sensor outputs analog differential voltage signals to an A/D converter, and the A/D converter converts the converted digital signals into digital signals through an I2The C serial interface is transmitted to the MCU. The operation keys comprise K1 zero clearing, K2 broadcasting and K3 peeling, the buzzer provides key prompt tones, the LCD display screen displays real-time weight values and maximum weight values, and the TTS voice broadcasting module broadcasts the maximum weight values. And a 5V low-voltage power supply is adopted to supply power to the MCU, the weighing sensor and the A/D converter.
The mechanical structure provides firstly a paper bridge test stage integrated with a weighing sensor and secondly a pressure drive for paper bridge load bearing tests. And the measurement and control system is used for realizing signal measurement and man-machine interaction of the weighing sensor. The base 1 is positioned at the bottommost layer of the mechanical device, and can stabilize the gravity center of the whole mechanical structure. A groove 11 is arranged at the center of the pressure sensor, and the pressure sensor 2 is arranged in the groove 11. The pressure test bench 3 is fixed on the pressure sensor 2 and used for placing a paper bridge to be tested. The bottom ends of the double-support upright posts 4 are fixed on two sides of the base 1 and used for connecting and fixing the bottom layer framework and the pressure driving framework. A slide bar trajectory holder 6 is fixed to the double support upright 4 for further stabilizing the double support upright 4 and constraining the movement pattern of the slide bar 7.
The lower pressing plate 5 is connected with the sliding rod 7, is completely contacted with the paper bridge deck and provides pressure in the test process, and is always kept in horizontal balance in the pressure applying process. The sliding rod 7 is used for connecting the lower pressing plate 5 and the connecting rod, and is used for transmitting the pressure applied by the operating handle 10 and the connecting rod 8 to the lower pressing plate 5 and drawing the lower pressing plate 5 to vertically lift in the testing process. The connecting rod beam is used for fixing the sliding rod 7, and the handle fixing beam 9 is used for fixingThe operating handle 10 is fixed. A tester provides a pressure source through an operating handle 10, and the pressure source and the connecting rod 8 form a force arm and a moving fulcrum of a lever, so that the pressure is multiplied and applied to the sliding rod 7 and the lower pressing plate 5, and finally the pressure acts on a paper bridge to be tested. The pressure signal sampling analog-to-digital converter comprises a half-bridge weighing sensor and an A/D converter. The load cell senses the pressure applied to the paper bridge by the mechanical structure and outputs an analog differential voltage signal to the a/D converter. The A/D converter samples and converts the signal into a 24-bit digital signal, which is passed through I2And the C serial interface transmits the data to the MCU, and the MCU converts the data into a weighing weight value through a proportionality coefficient.
The pressure testing device comprises a weighing sensor, the weighing sensor is connected with an A/D converter, the A/D converter is connected with a microprocessor, and the microprocessor is connected with a direct-current power supply. A groove 11 is formed in the central position of the base 1, a pressure sensor 2 is placed in the groove 11, the pressure test platform 3 is fixed on the pressure sensor 2, and a paper bridge to be tested is placed on the pressure sensor 2. The microprocessor is also connected with a human-computer interaction system, and the human-computer interaction system comprises an LCD screen, a voice broadcaster, an operation key and a reset key. The lower pressing plate 5 is connected with a sliding rod 7 through a fixing screw, and the sliding rod 7 is connected with the lower pressing plate 5 and a connecting rod 8. The weighing sensor adopts an HL-8 half-bridge type weighing sensor, and the A/D converter adopts a 24-bit high-precision A/D converter HX 711. Two through holes are formed in the middle of the slide bar track fixer 6, and the slide bar 7 penetrates through the two through holes of the slide bar track fixer 6. The operation keys comprise a zero clearing key I, a broadcast key II and a peeling key III.
The basic peripheral circuit of the MCU comprises a power supply, a reset circuit, a reference clock signal circuit and a basic key. And a 5V low-voltage direct-current power supply is adopted for working, and meanwhile, working voltage is provided for the A/D converter and the weighing sensor. The reference clock signal is provided by an external passive crystal oscillator. When the paper bridge weighing work is carried out, the fur weight is deducted in order to improve the testing precision. The invention adopts two modes to remove the fur. The first method is as follows: the system is powered on to remove the fur. The second method comprises the following steps: and (5) manually peeling.
The working principle of the invention is as follows: firstly, the MCU is electrified, and after waiting for two seconds, the paper bridge to be tested is placed in the center of the pressure test bench 3. Pressing a key three to manually remove the own fur weight of the paper bridge, holding the operating handle 10 to apply downward pressure, continuing to apply downward pressure after the lower pressing plate 5 completely contacts the bridge floor of the paper bridge until the paper bridge is crushed, and stopping applying pressure. And the real-time test weight and the maximum test weight are displayed on the LCD display screen in the paper bridge test process, wherein the maximum test weight value is the maximum bearing value of the paper bridge, and the maximum bearing value of the paper bridge is broadcasted by voice after the second key is pressed. And after the paper bridge weighing test is finished, pressing a first key to clear the maximum value. And cleaning the pressure test bench 3, and continuing to carry out bearing measurement on the next paper bridge to be measured. The method has the advantages of high integration level, accurate test and capability of improving the test efficiency to a greater extent.
The sliding rod 7 is connected with the operating handle 10 through a connecting rod, the operating handle 10 is fixed at the center of the handle fixing cross beam 9, the operating handle 10 applies pressure downwards to form a force arm and a moving fulcrum of a lever with the connecting rod, so that the pressure is doubled and amplified and applied to the sliding rod 7 and the lower pressing plate 5, and finally acts on a paper bridge to be tested. The pressure testing device comprises a base 1, a pressure sensor 2 and a pressure testing table 3, wherein the base 1, the pressure sensor 2 and the pressure testing table 3 are respectively arranged on the three parts from bottom to top. The base 1 is made of cast iron, and plays a role in stabilizing the center of gravity in the whole device. A groove 11 is formed in the center of the bottom 1, the groove 11 is used for placing the pressure sensor 2, the length and the width of the groove are increased by 5mm on the basis of the length and the width of the pressure sensor 2, and the depth of the groove 11 is half of the height of the pressure sensor 2. The end A of the bottom surface of the pressure sensor 2 is fixed in the groove 11 of the base 1 through a gasket 12, and the end B of the bottom surface is suspended with the base 1 in the connection mode. The end B of the top surface of the pressure sensor 2 is fixed on the bottom surface of the pressure test bench 3 through a gasket 12, and the end a of the top surface is suspended from the pressure test bench 3 in this connection mode.
The middle of the slide bar track fixer 6 is provided with two holes, the slide bar 7 penetrates through the slide bar track fixer 6 and has the function of restraining the motion mode of the slide bar 7 to be free sliding up and down, and further the lower pressing plate 5 can vertically lift in the vertical direction. The lower pressing plate 5 is connected with the sliding rod 7 through a fixing screw, so that the lower pressing plate 5 is kept in horizontal balance, the sliding rod 7 pulls the lower pressing plate 5 to do vertical lifting motion in the vertical direction, and the lower pressing plate 5 is completely contacted with the bridge floor of the paper bridge and provides pressure. Slide bar 7 passes through the connecting rod crossbeam and is connected with the flabellum of 8 lower extremes of connecting rod, and 8 upper end flabellums of connecting rod weld in the inside near-end portion of surveying of operating handle 10. The handle fixing beam 9 is fixed at the top one fourth of the double-support upright post 4, and the operating handle 10 is connected at the center of the handle fixing beam 9 and can rotate around the handle fixing beam. When the test is carried out, the operating handle 10 applies downward pressure, the connecting rod 8 is used as a moving fulcrum of the lever, the pressure applied by the operating handle 10 is doubled and transmitted to the sliding rod 7, and finally the lower pressing plate 5 is applied to the paper bridge to be tested.
An HL-8 half-bridge type weighing sensor and a 24-bit high-precision A/D converter HX711 are adopted. The load cell analog differential output channel is connected to the differential input channel a in the a/D converter, INA + and INA-respectively. The load cell is powered by the power output of the A/D converter, while the analog ground lead of the load cell is connected to the output ground pin of the A/D converter. The HX 711A/D converter amplifies the signal input by channel A by 64 or 128 times and performs 24-bit high-resolution analog-to-digital conversion. The power supply for the a/D converter is provided by the MCU, connecting pin DVDD 16 of HX711 to the power supply output pin of the MCU, and connecting pin XI 14 of HX711 to the ground output pin of the MCU. Data transmission between HX711 and MCU is through I2C serial bus, connecting clock pin SCK and data pin DOUT of HX711 to digital I/O interface of MCU via I2The C serial bus reads the magnitude of the digitized weighing voltage signal, and the read frequency is 80 Hz.
The MCU adopts 8-bit wide MCU, and its operating voltage is 5V, uses 5V lithium cell to supply power for the MCU integrated circuit board, and then indirectly supplies power for HX 711A/D converter and weighing sensor, and operating voltage is 5V also. The reference clock signal is provided by an external passive crystal oscillator and has a magnitude of 11.0592 MHz. Further basic peripheral circuits of the MCU include a power supply, a reset circuit, a reference clock signal circuit and keys. The man-machine interaction system mainly comprises an operation key, a buzzer, an LCD display screen and a TTS voice broadcast module. The operation keys are K1 (key one), K2 (key two) and K3 (key three) which are used for clearing, broadcasting and peeling respectively. The key is pressed and the buzzer sound provided by the buzzer is used as a prompt sound. MCU communicates with TTS voice broadcast module through UART serial communication mode, and the baud rate is configured to 9600bps, and data format is configured to eight bits of data bit, one bit of stop bit, no check bit.
And the MCU reads the digitized voltage signal of the weighing sensor read by the A/D converter in real time, converts the digitized voltage signal into weight through a proportionality coefficient, and continuously compares the real-time weight to obtain the maximum weight within the time range from the t0 to the current time. The maximum weight is cleared at the time when the K1 clear key is pressed, and this is taken as time t 0. The LCD display screen displays the real-time weight value and the maximum weight value. According to the technical scheme, the key K2 is pressed, the MCU sends the current maximum weight value to the TTS voice broadcast module through UART serial communication, and the TTS voice broadcast module carries out voice broadcast.
Two ways to remove the fur weight. The first method is as follows: and (3) electrifying the system to remove the fur, limiting the fur removing time within two seconds of electrifying the system, not carrying out pressure test on the paper bridge, and carrying out averaging operation on the implemented weight of the two seconds to obtain a result of the fur weight. The second method comprises the following steps: and manually peeling, namely pressing a key III to execute manual peeling work, and aiming at increasing, reducing or replacing objects generating fur weight in the midway of the test.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Although the present invention has been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without inventive work are still within the scope of the present invention.
Claims (10)
1. The utility model provides a paper bridge bears pressure measurement system for paper bridge contest, a serial communication port, the on-line screen storage device comprises a base, be equipped with pressure test platform on the base, still be equipped with the dual bracing stand on the base, slide bar orbit fixer and handle fixed cross beam are established to the cover in proper order on the dual bracing stand, wear to be equipped with the slide bar on the slide bar orbit fixer, the slide bar lower extreme is equipped with the holding down plate, the slide bar upper end is passed through the connecting rod and is linked to each other with operating handle, operating handle links to each other with handle fixed cross beam, be equipped with pressure test device between pressure test platform and the base.
2. The paper bridge bearing pressure measurement system for the paper bridge tournament according to claim 1, wherein the pressure test means comprises a load cell connected to an a/D converter connected to a microprocessor connected to a dc power supply.
3. The paper bridge bearing pressure measurement system for the paper bridge tournament according to claim 2, wherein the microprocessor is further connected to a human-computer interaction system, the human-computer interaction system comprising an LCD screen, a voice announcer, an operation button and a reset button.
4. The system for measuring the paper bridge bearing pressure for the paper bridge tournament according to claim 1, wherein the base has a groove at the center, a pressure sensor is placed in the groove, the pressure testing platform is fixed on the pressure sensor, and the paper bridge to be tested is placed on the pressure sensor.
5. The paper bridge bearing pressure measurement system for the paper bridge tournament according to claim 1, wherein the lower pressure plate is connected with a slide bar through a fixing screw, and the slide bar connects the lower pressure plate and the link bearing.
6. The paper bridge bearing pressure measuring system for paper bridge tournament according to claim 2, wherein the load cell is HL-8 half bridge type load cell, and the a/D converter is 24 bit high precision a/D converter HX 711.
7. The paper bridge bearing pressure measuring system for the paper bridge tournament according to claim 1, wherein the slide bar track holder has two through holes opened in the middle, and the slide bar passes through the two through holes of the slide bar track holder.
8. The paper bridge bearing pressure measurement system for the paper bridge tournament according to claim 3, wherein the operation buttons comprise a clear button one, a broadcast button two and a peel button three.
9. The paper bridge bearing pressure measuring system for paper bridge tournament according to claim 2, wherein the a/D converter converts the digital signal into the digital signal through I2The C serial interface is transmitted to the MCU.
10. The paper bridge bearing pressure measuring system for the paper bridge tournament according to claim 6, wherein the clock pin SCK and the data pin DOUT of the 24-bit high precision a/D converter HX711 are connected to the digital I/O interface of the MCU.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021993731.8U CN212932197U (en) | 2020-09-11 | 2020-09-11 | Paper bridge bearing pressure measurement system for paper bridge competition |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021993731.8U CN212932197U (en) | 2020-09-11 | 2020-09-11 | Paper bridge bearing pressure measurement system for paper bridge competition |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113203626A (en) * | 2021-04-23 | 2021-08-03 | 广东艾斯瑞仪器科技有限公司 | Carton compressive strength test device with overvoltage protection |
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2020
- 2020-09-11 CN CN202021993731.8U patent/CN212932197U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113203626A (en) * | 2021-04-23 | 2021-08-03 | 广东艾斯瑞仪器科技有限公司 | Carton compressive strength test device with overvoltage protection |
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