CN111443220B - Calibration device for engine speed measuring instrument - Google Patents
Calibration device for engine speed measuring instrument Download PDFInfo
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- CN111443220B CN111443220B CN202010248323.8A CN202010248323A CN111443220B CN 111443220 B CN111443220 B CN 111443220B CN 202010248323 A CN202010248323 A CN 202010248323A CN 111443220 B CN111443220 B CN 111443220B
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- vibrating plate
- bell
- speed measuring
- crankshaft
- measuring instrument
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- 230000003116 impacting effect Effects 0.000 claims description 5
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 5
- 230000005236 sound signal Effects 0.000 description 5
- 230000006978 adaptation Effects 0.000 description 3
- 230000000737 periodic effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P21/00—Testing or calibrating of apparatus or devices covered by the preceding groups
- G01P21/02—Testing or calibrating of apparatus or devices covered by the preceding groups of speedometers
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Engines (AREA)
Abstract
The invention relates to a calibration device for an engine rotating speed measuring instrument, which comprises an assembly frame, a vibrating plate, a vibration generating device and a bell mechanism, wherein the bell mechanism comprises a bell and a bell striking head for striking the bell, one of the bell and the bell striking head is arranged on the vibrating plate, and the other part is fixedly arranged relative to the assembly frame. The invention solves the technical problem that the sound generated by the vibration plate during vibration is too small to be effectively measured by the rotating speed measuring instrument in the prior art.
Description
Technical Field
The present invention relates to a calibration device for an engine speed measuring instrument in a calibration apparatus.
Background
According to the requirements of GB18285-2018 and GB3847-2018, each detection line needs to be provided with an engine rotating speed measuring instrument, the traditional engine rotating speed measuring instrument only measures the rotating speed of an engine, the basic principle of the measurement is to detect the rotating speed of the engine by detecting the vibration of the engine, and a calibrating device for calibrating the rotating speed measuring instrument also only needs to output the corresponding vibration which can be detected. And vibration signals and audio signals of the engine during working are collected by vibration induction type rotating speed measuring instruments of partial models in the market at present, so that the traditional calibrating device only capable of outputting vibration cannot calibrate the rotating speed measuring instruments.
Chinese patent CN110161284A discloses a calibration device for a motor vehicle engine speed measuring instrument, which comprises a vibration plate and a vibration generating device capable of generating periodic vibration, wherein the vibration generating device comprises a cam driven by a main shaft, and the cam is in contact with the vibration plate. When the rotating speed measuring instrument is used, the calibrated rotating speed measuring instrument is adsorbed and fixed on the upper side of the vibrating plate, the cam rotates periodically to enable the vibrating plate to generate periodic vibration, meanwhile, when the vibrating plate reaches the low position from the high position of the cam, a certain audio signal is generated, and the vibration signal and the audio signal are measured by the rotating speed measuring instrument to calibrate the rotating speed measuring instrument. However, the existing calibration device for the engine speed measuring instrument has the problems that: the difference between the cam and the crankshaft of the actual engine is large, the actual engine is divided into a single-cylinder engine, a double-cylinder engine, a three-cylinder engine and the like according to the number of cylinders, and the cam in the prior art cannot truly simulate the vibration of the engine with the corresponding number of cylinders, so that the accuracy of the calibration of the speed measuring instrument cannot be ensured; in addition, in the actual use process, it is found that the audio frequency generated by the existing calibration device is originated from the fall impact when the vibration plate reaches the low position from the high position of the cam, the impact sound is not very large, and the difference of the sound generated by the existing calibration device is larger than that generated by a real engine, so that the rotating speed measuring instrument sometimes cannot obtain the audio frequency signal, and therefore the rotating speed measuring instrument cannot be accurately calibrated.
Disclosure of Invention
The invention aims to provide a calibration device for an engine rotating speed measuring instrument, which aims to solve the technical problem that the sound generated when a vibrating plate vibrates is too small to be effectively measured by the rotating speed measuring instrument in the prior art.
In order to solve the technical problems, the technical scheme of the invention is as follows:
the utility model provides a calibrating device for engine speed measuring apparatu, includes device frame, vibration board and vibration generating device, engine speed measuring apparatu calibrating device still includes ringing mechanism, ringing mechanism include the jingle bell with be used for striking the jingle bell striking head of jingle bell, one of them part of jingle bell, jingle bell striking head set up in on the vibration board, another part is relative the device frame fixed set up.
The vibration generating device comprises a main shaft driven by a power mechanism, a bearing seat positioned on the right side of the main shaft, and a crankshaft with two ends detachably connected between the main shaft and the bearing seat, wherein the crankshaft comprises at least two crankshaft unit blocks arranged left and right, and each crankshaft unit block comprises a main journal, a connecting rod journal used for contacting and impacting the bottom of the vibration plate, and a crank connected between the main journal and the connecting rod journal.
The right end of the vibrating plate is hinged with the device frame, the hinge axis of the vibrating plate extends in the front-rear direction, a vibrating plate spring used for enabling the vibrating plate to be in a left-high-right-low inclined posture when the vibrating plate is not impacted is arranged between the vibrating plate and the device frame, and the radius of the crankshaft of each crankshaft unit block is gradually reduced from left to right.
The vibrating plate spring is a tension spring with the upper end connected with the vibrating plate and the lower end installed on the device frame through a spring seat.
The device frame is provided with a spring seat height adjusting mechanism for adjusting the height of the spring seat, the spring seat height adjusting mechanism comprises a height adjusting bolt in threaded connection with the device frame, the height adjusting bolt is vertically arranged, and the upper end of the height adjusting bolt is in running fit with the spring seat.
The invention has the beneficial effects that: in the invention, the vibration generating device enables the vibration plate to vibrate, and the impact head of the bell impacts the bell to generate the sound signal while the vibration plate vibrates, namely the vibration sound generated by the vibration plate is synchronously amplified by the bell, and the vibration signal of the vibration plate and the sound signal of the bell are read by the engine rotating speed measuring instrument, thereby realizing the calibration of the engine rotating speed measuring instrument.
Drawings
Fig. 1 is a schematic structural view when a vibration plate is not struck in embodiment 1 of the present invention;
fig. 2 is a schematic view of a state where a vibration plate is struck by a left crank unit block in embodiment 1 of the present invention;
FIG. 3 is a schematic view showing the fitting of the bearing housing and the pedestal in embodiment 1;
FIG. 4 is a schematic structural view of a block of the crankshaft unit of FIG. 1;
FIG. 5 is an enlarged view taken at A in FIG. 1;
fig. 6 is a schematic structural view of embodiment 2 of the present invention.
Detailed Description
An embodiment 1 of a calibration device for an engine speed measuring instrument is shown in fig. 1 to 5: the device frame comprises a device frame, a vibrating plate 8 and a vibration generating device, wherein the device frame comprises a pedestal 1, the vibration generating device comprises a main shaft 17 driven by a power mechanism and a bearing seat 13 positioned on the right side of the main shaft, a guide rail groove extending along the left-right direction in a guide direction is formed in the pedestal, the guide rail groove is a big-bellied guide rail groove 18 with a big bellied opening, the bearing seat 13 is assembled on the guide rail groove 18 in a guide movement along the left-right direction, a bearing seat fixing structure used for fixing the position of the bearing seat after the position of the bearing seat is adjusted is arranged between the device frame and the bearing seat 13, the bearing fixing structure comprises a bearing seat tightening screw 14 in threaded connection with an axis on the pedestal extending along the up-down direction, and the lower end of the bearing seat tightening screw can tighten the bearing seat to realize the position fixation after the bearing seat moves left and right.
The power mechanism comprises a motor 2 and a gear box 3, wherein the output rotating speed of the gear box or an electrode can be measured, and an output shaft of the gear box 3 forms a main shaft 17 of the power mechanism. The vibration generating device further comprises crankshafts with two ends detachably connected between the main shaft and the bearing seat, the crankshafts are formed by sequentially connecting at least two crankshaft unit blocks in the left-right direction, each crankshaft unit block comprises a connecting rod journal 21 used for contacting and impacting the bottom of the vibration plate, main journals positioned on the left side and the right side of the connecting rod journal and cranks 22 connected between the connecting rod journal and the main journals, and adjacent crankshaft unit blocks are connected through unit block detachable connection structures. Two adjacent bent axle unit blocks of definition are left side bent axle unit block 16 and right side bent axle unit block 15 respectively, and releasable connection structure is including setting up the spline protruding 23 that splines on the left side main journal 19 of right side bent axle unit block, and releasable connection structure is still including setting up the groove that splines on the right side main journal of left side bent axle unit block 16, and the spline groove structure that splines protruding 23 for the integral key shaft structure, spline groove for pegging graft with the protruding adaptation that splines. In order to enhance the connection between the rotation-stopping protrusion and the rotation-stopping groove, the protrusion jacking screw 18 is screwed on the groove wall of the rotation-stopping groove along the radial direction, after the rotation-stopping protrusion is inserted into the rotation-stopping groove in a matching way, the protrusion jacking screw 18 can be screwed, and the protrusion jacking screw 18 can jack the corresponding rotation-stopping protrusion. The right-hand member of main shaft is for only changeing groove structure, and coaxial line rotates on the bearing frame to be equipped with only changeing protruding structure, and the only commentaries on classics arch on the left side main journal of the bent axle unit of leftmost like this can peg graft with the only groove adaptation that changes of main shaft right-hand member, and the only groove on the right side main journal of the bent axle unit of rightmost side can peg graft with only changeing protruding adaptation on the bearing frame. Item 20 in the figure represents the right main journal of the right crankshaft block 15; item 24 represents the detent recess on the right main journal of the right cell block 15.
The device frame further comprises a vibrating plate support 12 fixed at the right end of the pedestal, the right end of the vibrating plate 8 is hinged to the vibrating plate support, the hinged axis of the vibrating plate extends in the front-back direction, and the left end of the vibrating plate 8 can vibrate up and down under the impact of the corresponding connecting rod journal 21. The calibration device for the engine speed measuring instrument further comprises a ringing mechanism, the ringing mechanism comprises a ringing bell and a ringing bell impact head 6 used for impacting the ringing bell, one of the ringing bell and the ringing bell impact head is arranged on the vibrating plate, and the other component is fixedly arranged relative to the device frame. In the present embodiment, the bell striking head 6 is disposed at the left end of the vibrating plate 8, the bell 5 is mounted on the bell holder 4, and the bell holder 4 is mounted on the housing of the gear box 3, and the bell is a prior art bicycle bell, which belongs to the prior art and will not be described in detail herein.
Be equipped with vibration board spring 9 between the right-hand member of vibration board support 12 and vibration board, the upper end of vibration board spring 9 is connected on vibration board 8, and vibration board spring's lower extreme is connected on spring holder 10, and the height-adjustable of spring holder 10 is provided with the adjustment on vibration board support 12 the spring holder height control mechanism of spring holder height, spring holder height control mechanism include threaded connection in vibration board support's height control bolt 11, height control bolt vertical arrangement, height control bolt 11 the upper end with spring holder 10 normal running fit. By screwing the height-adjusting bolt 11, the height of the spring seat 10 can be adjusted, and the inclination angle of the vibrating plate when not being hit can be adjusted. In the present invention, the vibrating plate spring 9 is a tension spring, when the vibrating plate is not hit by the connecting rod journal of the corresponding crankshaft unit, the tension spring 9 is not pulled, as shown in fig. 1, the left end of the vibrating plate cannot be turned downward due to the limiting action of the tension spring, and the vibrating plate is in a tilted posture with a height from left to right, that is, the tension spring can ensure that the lowest position of the vibrating plate during each falling is consistent, and when the lowest position is, the vibrating plate is in a tilted posture with a height from left to right. From left to right, the bent axle radius of each bent axle unit block diminishes gradually, that is to say the bent axle radius of right side bent axle unit block 15 is less than the bent axle radius of left side bent axle unit block 16, can guarantee like this when being strikeed the vibration board by the connecting rod axle journal of each bent axle unit block, the highest position of vibration board is unanimous, guarantees the effective striking of jingle bell striking head to the jingle bell. When the vibration plate is not impacted, the vibration plate is in an inclined posture with a high left side and a low right side, so that the impact duration of the connecting rod journal of the right crankshaft unit block 15 and the impact duration of the connecting rod journal of the left crankshaft unit block 16 and the vibration plate are consistent in one rotation period of the main shaft, the vibration amplitude and the vibration period generated by the vibration plate are consistent no matter which crankshaft unit block the connecting rod journal impacts the vibration plate, the vibration of a real engine is effectively simulated, and the effective calibration of the engine speed measuring instrument can be realized at the moment.
When the device is used, the rotating speed measuring instrument 7 to be calibrated is fixed on the upper side of the vibrating plate 8, the main shaft 17 drives the crankshaft to rotate, the main shaft 17 rotates for a circle at a constant speed, the connecting rod journal of the left crankshaft unit block 16 and the connecting rod journal of the right crankshaft unit block 15 respectively impact the vibrating plate once, the vibrating plate generates two effective vibrations to simulate a double-cylinder engine, and the vibration amplitude and the vibration time of each effective vibration of the vibrating plate are consistent and consistent with a real engine. If the vibration plate is horizontally arranged or the left bottom and the right height are arranged, the contact impact time of the left crankshaft unit block with the larger crankshaft radius and the vibration plate is longer than that of the right crankshaft unit block with the smaller crankshaft radius and the vibration plate, vibration data inconsistent with the real working condition of the engine can be generated, and the accurate calibration of the engine rotating speed measuring device is not facilitated.
In other embodiments of the present invention, the bell of the bell mechanism may also be mounted on the vibrating plate, and the bell striking head is fixed relative to the device frame; the number of the crankshaft unit blocks can be set according to the requirement, for example, three, four or other numbers; the convex jacking screw is not needed; the unit block detachable connection structure for realizing the connection of the adjacent crankshaft unit blocks can also be a flange bolt connection structure; of course, the crankshaft unit blocks can be in a non-detachable welding or integral casting structure.
An embodiment 2 of a calibration device for an engine speed measuring instrument is shown in fig. 6: embodiment 2 differs from embodiment 1 in that the bell of the bell mechanism is attached to the diaphragm holder, and the bell striking head is provided at the right end of the diaphragm.
Claims (4)
1. The utility model provides a calibrating device for engine speed measuring apparatu, includes device frame, vibration board and vibration generating device, its characterized in that: the calibration device for the engine rotating speed measuring instrument further comprises a bell mechanism, the bell mechanism comprises a bell and a bell impact head used for impacting the bell, one of the bell and the bell impact head is arranged on the vibrating plate, the other part is fixedly arranged relative to the device frame, the vibration generating device comprises a main shaft driven by a power mechanism and a bearing seat positioned on the right side of the main shaft, the vibration generating device further comprises a crankshaft with two ends detachably connected between the main shaft and the bearing seat, the crankshaft comprises at least two crankshaft unit blocks arranged on the left and right, each crankshaft unit block comprises a main journal, a connecting rod journal used for contacting and impacting the bottom of the vibrating plate and a crank connected between the main journal and the connecting rod journal, the rotating speed measuring instrument to be calibrated is fixed on the upper side of the vibrating plate, the main shaft drives the crankshaft to rotate, and the main shaft rotates for one circle every uniform speed, the connecting rod journal of the left crankshaft unit block and the connecting rod journal of the right crankshaft unit block respectively impact the vibration plate once.
2. The calibration device of the engine speed measuring instrument according to claim 1, characterized in that: the right end of the vibrating plate is hinged with the device frame, the hinge axis of the vibrating plate extends in the front-rear direction, a vibrating plate spring used for enabling the vibrating plate to be in a left-high-right-low inclined posture when the vibrating plate is not impacted is arranged between the vibrating plate and the device frame, and the radius of the crankshaft of each crankshaft unit block is gradually reduced from left to right.
3. The calibration device of the engine speed measuring instrument according to claim 2, characterized in that: the vibrating plate spring is a tension spring with the upper end connected with the vibrating plate and the lower end installed on the device frame through a spring seat.
4. The calibration device of the engine speed measuring instrument according to claim 3, characterized in that: the device frame is provided with a spring seat height adjusting mechanism for adjusting the height of the spring seat, the spring seat height adjusting mechanism comprises a height adjusting bolt in threaded connection with the device frame, the height adjusting bolt is vertically arranged, and the upper end of the height adjusting bolt is in running fit with the spring seat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010248323.8A CN111443220B (en) | 2020-04-01 | 2020-04-01 | Calibration device for engine speed measuring instrument |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010248323.8A CN111443220B (en) | 2020-04-01 | 2020-04-01 | Calibration device for engine speed measuring instrument |
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| CN111443220A CN111443220A (en) | 2020-07-24 |
| CN111443220B true CN111443220B (en) | 2021-09-21 |
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| CN202010248323.8A Active CN111443220B (en) | 2020-04-01 | 2020-04-01 | Calibration device for engine speed measuring instrument |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113125805A (en) * | 2021-04-08 | 2021-07-16 | 河南省计量科学研究院 | Standard machine for calibrating moving speed detector of cross beam of testing machine |
| CN115644241A (en) * | 2022-10-31 | 2023-01-31 | 黑龙江省北方蔬果保鲜技术研究院(普通合伙) | Waxy corn preservation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103645346B (en) * | 2013-12-02 | 2017-03-22 | 中国西电电气股份有限公司 | An analog device and calibration method for mechanical characteristics of a velometer for detecting and calibrating a switch |
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| CN106989816B (en) * | 2017-06-02 | 2020-05-19 | 中国航发南方工业有限公司 | Turboprop engine vibration measurement sensor calibration and measurement device |
| CN108732375B (en) * | 2018-04-20 | 2023-07-14 | 浙江师范大学 | Device and method for detecting engine rotation speed of snowplow |
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| JPH10260199A (en) * | 1997-03-13 | 1998-09-29 | Robert Bosch Gmbh | Apparatus for obtaining momentum |
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Address after: No.21 Huayuan Road, Jinshui District, Zhengzhou City, Henan Province Patentee after: Henan Institute of Metrology and Testing Science Address before: No.21 Huayuan Road, Jinshui District, Zhengzhou City, Henan Province Patentee before: HENAN PROVINCE INSTITUTE OF METROLOGY |