CN209910866U - V-belt transmission force measurement experiment device - Google Patents
V-belt transmission force measurement experiment device Download PDFInfo
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- CN209910866U CN209910866U CN201920992162.6U CN201920992162U CN209910866U CN 209910866 U CN209910866 U CN 209910866U CN 201920992162 U CN201920992162 U CN 201920992162U CN 209910866 U CN209910866 U CN 209910866U
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Abstract
A V-belt transmission force measurement experiment device comprises a sensor, an experiment bench, a display, a transmission device, a belt wheel and a V-belt to be measured, wherein the display is electrically connected with the sensor through a connecting wire and fixed on the experiment bench, the transmission device is fixed on the experiment bench, the belt wheel is installed on the output end of the transmission device, the V-belt to be measured is installed on the belt wheel, one end of the V-belt penetrates through a slack-side force measuring sensor, the other end of the V-belt penetrates through a tight-side force measuring sensor, the end part of the V-belt is fixed on the V-belt through an adjusting bolt, the slack-side force measuring sensor and the tight-; the utility model discloses can carry out the demonstration of belt drive atress condition teaching, through the situation of change of measuring the power on area both sides, know the atress condition of taking behind the tensioning out of work time, during operation to this device simple structure measures accurately, can extensively be used for teaching experiment and engineering test.
Description
Technical Field
The utility model relates to a mechanical design experiment teaching measuring instrument, concretely relates to carry out measuring experimental apparatus to the area atress condition in the belt drive.
Background
Belt drives are an important mechanical drive, with V-belts being the most common. The basic courses of mechanical design and mechanical design are professional core courses of mechanical engineering, wherein the design related to belt transmission is one of the important knowledge points of the courses. In the teaching process of belt transmission, the stress analysis of the belt is key and difficult, the understanding of the Euler formula only depends on formula derivation, and the derivation process is abstract and unintelligible.
At present, belt drive experimental apparatus is less, and what current instrument adopted is high-speed belt drive, and experimental data is instrument automatic acquisition, and the experimentation is short, and the student can only watch the result that the experiment shows, can't participate in the operation in-process and go to experience belt drive's characteristics, can't realize the supplementary explanation to theoretical knowledge, and the experimental effect is unsatisfactory to current high-speed pivoted experimental facilities has the potential safety hazard.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a V belt drive measures experimental apparatus, this experimental apparatus be convenient for mr for the student explain belt drive's rationale, increased the experimentation in the V belt drive experiment, improved student's experiment participation, strengthen the student to the understanding of belt drive theoretical knowledge.
The utility model aims at adopting the following technical scheme to realize. According to the utility model provides a V belt transmission force measurement experiment device, include the sensor, experiment bench 10 that are constituteed by slack side force cell sensor 2, tight limit force cell sensor 9 and band pulley friction force sensor 4, through connecting wire and sensor electric connection and fix the display on experiment bench 10, fix transmission on experiment bench 10, install band pulley 5 on the transmission output, install the V area 3 of awaiting measuring on band pulley 5, one end of V area 3 passes slack side force cell sensor 2, the other end passes tight limit force cell sensor 9, the tip of this V area 3 all is fixed on V area 3 through adjusting bolt 18, slack side force cell sensor 2 and tight limit force cell sensor 9 pass through slider 20 and are connected with little hand wheel 1, transmission's input is connected with big hand wheel 11 through connecting rod 19;
preferably, the transmission device comprises a WD worm reducer 7 mounted at the end of the connecting rod, a worm wheel 6 and a worm 8 meshed with the worm wheel 6, one end of the worm 8 is connected with the pulley friction force sensor 4 through a sliding bearing 16, the other end of the worm is connected with one end of a magnetic coupling 17 for preventing the worm reducer 7 from generating axial force when transmitting power to the worm 8 through the sliding bearing 16, the other end of the magnetic coupling 17 is connected with the output end of the WD worm reducer 7, and the output shaft of the worm wheel 6 is mounted with a pulley 5;
preferably, the display comprises a slack side force measuring display 14 which is electrically connected with the slack side force measuring sensor 2 and is used for displaying the tension of the slack side of the V belt 3, a tight side force measuring display 13 which is electrically connected with the tight side force measuring sensor 9 and is used for displaying the tension of the tight side of the V belt 3, and a belt pulley friction display 12 which is electrically connected with the belt pulley friction sensor 4 and is used for displaying the friction between the belt pulley 5 and the V belt 3;
preferably, the sliding device 20 comprises a sensor connecting plate 20-1 for fixing the slack side load cell 2 and the tight side load cell 9, a sliding table connecting plate 20-2 for fixing the sensor connecting plate 20-1, and a sliding table 20-3 in sliding fit with the sliding table connecting plate 20-2; the sliding table is provided with a screw rod, the end part of the screw rod is provided with a small hand wheel, and the bottom of the sliding table connecting plate is provided with a nut matched with the screw rod.
The utility model provides a V takes transmission to measure experimental apparatus has following advantage:
1. the utility model discloses can carry out V belt drive atress condition teaching demonstration, through the situation of change of measuring the power on taking both sides, know the atress condition of taking the tensioning back out of work time, during operation.
2. The utility model discloses after changing the band pulley, can be used to the area atress analysis of different types such as flat belt, hold-in range, polywedge bet, multiple belt type, the usage is extensive.
3. The utility model discloses simple structure, convenient to use, low-speed safety, with low costs, it is accurate to measure, can extensively be used for teaching experiment and engineering test, facilitate promotion.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention can be implemented according to the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more obvious and understandable, the following preferred embodiments are mentioned below, and the detailed description is given below with reference to the accompanying drawings.
Drawings
FIG. 1 is a front view of the V-belt transmission force measurement experimental device of the present invention;
FIG. 2 is a top view of the V-belt transmission force measurement experimental apparatus of the present invention;
fig. 3 is the utility model relates to a V takes transmission power to measure experimental apparatus's left side view.
[ reference numerals ]
1-small hand wheel; 2-a loose edge force cell; 3-V belt, 3-1-loose edge, 3-2-tight edge; 4-pulley friction force sensor; 5-a belt wheel; 6-a worm gear; 7-WD worm reducer; 8-a worm; 9-tightening the edge force transducer; 10-experiment bench; 11-big hand wheel; 12-wheeled friction display; 13-tightening the edge force measuring display; 14-a loose edge force measurement display; 15-a display stand; 16-a plain bearing; 17-a magnetic coupling; 18-adjusting the bolt; 19-a connecting rod; 20-sliding device, 20-1-sensor connecting plate, 20-2-slipway connecting plate and 20-3-slipway.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined purpose, the following detailed description will be given to the specific embodiments, structures, features and effects of the V-belt transmission force measurement experimental apparatus according to the present invention with reference to the accompanying drawings and preferred examples.
In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", and the like indicate orientations or positional relationships based on the drawings, and are only for the purpose of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
Referring to fig. 1 to 3, a V-belt transmission force measurement experiment device includes an experiment bench 10, a worm wheel 6 mounted on the experiment bench 10, and a worm 8 engaged with the worm wheel 6, referring to fig. 2, one end of the worm 8 is sequentially mounted with a sliding bearing 16 and a pulley friction force sensor 4, the other end of the worm 8 is sequentially mounted with a sliding bearing 16, a magnetic coupling 17, and a WD screw reducer 7, the magnetic coupling 17 is mounted on an output end of the WD screw reducer 7 and is simultaneously connected with the other end of the worm 8, an input end of the WD screw reducer 7 is connected with a large hand wheel 11 through a connecting rod 19, when the large hand wheel 11 is rotated, a rotation force of the large hand wheel 11 is transmitted to the WD screw reducer 7 through the connecting rod 19, a pulley 5 is mounted on an output shaft of the worm wheel 6, a V-belt 3 to be measured is mounted on the pulley 5, the V-belt 3 includes a, the end part of a loose edge 3-1 of the V-shaped belt 3 penetrates through the loose edge force transducer 2 and is arranged on the loose edge 3-1 of the V-shaped belt 3 through an adjusting bolt 18, the end part of a tight edge 3-2 of the V-shaped belt 3 penetrates through the tight edge force transducer 9 and is arranged on the tight edge 3-2 of the V-shaped belt 3 through the adjusting bolt 18, the adjusting bolt 18 can adjust the tightness of the V-shaped belt, the loose edge force transducer 2 and the tight edge force transducer 9 are both fixed on a sliding device, the input end of the sliding device 20 penetrates through the side wall of the experiment table frame 10 to be connected with the small hand wheel 1, please refer to figure 2, the sliding device 20 comprises a transducer connecting plate 20-1 for fixing the loose edge force transducer 2 and the tight edge force transducer 9, a sliding table connecting plate 20-2 for fixing the transducer connecting plate 20-1 and a sliding table 20-3 in sliding fit with the, a screw rod with a small hand wheel 1 installed at the end part is arranged on the sliding table 20-3, a nut matched with the screw rod is arranged at the bottom of the sliding table connecting plate 20-2, the small hand wheel 1 drives the screw rod to rotate, the sliding table connecting plate 20-2 provided with the nut is driven to horizontally slide on the sliding table 20-3 through the matching of the screw rod and the nut, and then the fixed slack-side force measuring sensor 2 and the tight-side force measuring sensor 9 are driven to horizontally move through the sensor connecting plate 20-1 installed on the sliding table connecting plate 20-2, so that the tightness of the V-belt 3 is adjusted, and the slack-side force measuring sensor 2, the tight-side force measuring sensor 9 and the belt wheel friction force.
Referring to fig. 1, a pulley friction display 12, a tight-side force measurement display 13 and a loose-side force measurement display 14 are respectively mounted on the top of the experiment bench 10, the pulley friction display 12 is electrically connected with the pulley friction sensor 4 through a connecting wire, the tight-side force measurement display 13 is electrically connected with the tight-side force measurement sensor 9 through a connecting wire, the loose-side force measurement display 14 is electrically connected with the loose-side force measurement sensor 2 through a connecting wire, and the pulley friction display 12, the tight-side force measurement display 13 and the loose-side force measurement display 14 form a display.
When the big hand wheel 11 is rotated, the big hand wheel 11 drives the connecting rod 19 to rotate, the connecting rod 19 drives the worm 8 to rotate through the WD worm reducer 7 and the magnetic coupling 17, the worm 8 provides driving torque for the belt wheel 5 through the worm wheel 6, so that the belt wheel 5 and the V belt 3 generate friction but still keep relatively still, so that friction force is generated between the belt wheel 5 and the V-belt 3, at the moment, the worm wheel 6 applies a reverse acting force to the worm 8, the worm 8 slides along the axial direction and is pressed against the belt wheel friction force sensor 4 arranged at the end part of the worm 8, therefore, the friction force between the belt wheel 5 and the V-belt 3 is measured, and in order to avoid the axial force generated between the worm reducer 7 and the worm 8 when the worm reducer transmits power to the worm 8, a magnetic coupling 17 is arranged between the worm reducer 7 and the worm 8 to avoid the generation of the axial force, and the magnetic coupling 17 adopts a non-contact type magnetic coupling.
Wherein, WD worm reducer 7, worm 8, magnetic coupling 17 and sliding bearing 16 constitute the transmission device.
During the experiment, the V belt 3 to be tested is arranged on the belt wheel 5, the small hand wheel 1 is rotated firstly, the adjusting bolt 18 is adjusted in a screwing mode, the V belt 3 is tensioned gradually, the data of the display is watched, the tightening edge force measurement display 13 displays the tension data of the tightening edge 3-2 of the V belt, the loose edge force measurement display 14 displays the tension data of the loose edge 3-1 of the V belt, and the loose edge of the V belt is adjusted continuously by adjusting the tightness of the V belt 33-1 and the tight side 3-2, when the data on the loose side force measurement display 14 and the tight side force measurement display 13 are equal, the tension F of the loose side 3-1 and the tight side 3-2 is represented0And recording the data;
then the big hand wheel 11 is rotated, the big hand wheel 11 drives the WD worm reducer 7 to rotate through the connecting rod 19, so that friction force is generated between the belt wheel 5 and the V belt 3, and tension force F is generated on the tight edge 3-21The loose edge 3-1 generates a pulling force F2And records the readings F of the tight edge force measurement display 13 and the loose edge force measurement display 141And F2。
The friction force generated between the belt wheel 5 and the V-belt 3 is transmitted to the worm wheel 6 through the output shaft of the worm wheel 6 and then transmitted to the worm 8, the worm wheel 6 and the worm 8 move relatively, the worm wheel 6 pushes the worm 8 to press the belt wheel friction force sensor 4, so that the belt wheel friction force sensor 4 measures the friction torque between the V-belt 3 and the belt wheel 5, namely the central torque T borne by the belt wheel 5, and records the data T on the belt wheel friction force display 12. The Euler formula and the related theoretical knowledge of belt drive can be analyzed and verified according to the measured data.
The utility model discloses still adopt following technical scheme to realize. The foundation the utility model provides a V takes transmission to measure experimental apparatus's measuring method specifically includes following step:
s1, turning on a power supply, and properly adjusting the small hand wheel 1 and the large hand wheel 11 to enable the numerical values of the slack-side force measuring sensor 2 and the tight-side force measuring sensor 9 to be displayed as zero;
s2, rotating the small hand wheel 1, adjusting the sliding device 20 to tighten the V-shaped belt 3, recording the numerical values of the slack-side force measuring sensor 2 and the tight-side force measuring sensor 9, and adjusting the adjusting bolt 18 to enable the numerical values of the slack-side force measuring sensor 2 and the tight-side force measuring sensor 9 to be equal;
s3, rotating the big hand wheel 11 to increase the value transmitted from the tight edge force measuring sensor 9 to the tight edge force measuring display 13 and to reduce the initial tension of the value to less than twice, recording the values on the pulley friction force display 12, the tight edge force measuring display 13 and the slack edge force measuring display 14 after the value is kept stable, and sensing the tightness state of the V-belts 3 on both sides of the pulley 5;
s4, carrying out multiple experiments according to the experiment steps from S1 to S3, and recording experiment data;
s5, verifying the Euler formula according to experimental data, and determining the relationship between the central moment of the belt wheel 5 and the tension of the tight side 3-2 and the tension of the loose side 3-1 of the v-belt 3;
s6, comparing and summarizing the experimental data with the data calculated theoretically, and analyzing the cause of experimental error, wherein the specific data analysis result is as follows:
1) stress condition analysis of V-belt
The V-belt drive has an initial tension F when not in work0The V-belt is tensioned and loosened by the friction force generated between the V-belt and the belt wheel when the belt transmission works, and the tension force during tensioning is F1The loose edge tension is F2If the elastic deformation generated by the V-belt is considered to be negligible approximately and the V-belt is considered to be a linear elastic body, the amount of change in the increase in the tight side tension of the V-belt should be equal to the amount of change in the decrease in the slack side tension, that is, the V-belt should be approximately considered to be a linear elastic body
F1-F0＝F0-F2 (1)
F1+F2＝2F0 (1-a)
Effective pulling force FeThe relationship with the power P transmitted by the belt drive is:
P＝Fev/1000 (2)
the unit of power P is KW;
effective pulling force FeThe unit of (a) is N;
the speed v of the belt is in m/s;
when the belt speed is constant, the transmitted power P and the effective tension F in the belt driveeIt is related.
From Fe＝Ff＝F1-F2It is known that the transmitted power P and the belt drive total friction FfIt is related. It can thus be derived: when other conditions are not changed, as initial tension F0At a certain time, the total friction force FfHaving a limit (or threshold) value, the total friction force FfThe limit value of (b) is a factor limiting the V-belt drive capacity.
2) Theoretical analysis of the Euler formula
When the V belt slips in the transmission process of the V belt, the friction force reaches a limit value, and the effective tension F transmitted by the V belteA maximum value is reached. At this time, the tightening tension F of the belt is calculated and derived from theory1And the loose edge tension F2The relationship between them can be expressed by the euler formula for the friction of the flexible body, namely:
F1＝F2efα (3)
in the formula: e-base of natural logarithm (e-2.718 …);
f-coefficient of friction (for v-band, the equivalent coefficient of friction f is usedvInstead of f)
α -wrap angle, rad, of the belt on the pulley.
3) Principle of experimental verification
The experiment is carried out by utilizing the v-belt mechanical detection experiment equipment, four groups of data can be recorded, namely initial tension F0Tension F of tight side1And the loose edge tension F2And the moment T borne by the belt pulley, the relationship between the moment T and the moment T is as follows:
in the formula: dd1-a reference diameter of the driving pulley;
Ff-total friction on the running surface of the drive belt;
Fe-effective tension of the belt drive;
e-base of natural logarithm (e ═ 2.718 …);
f-coefficient of friction (for V-belt, the equivalent coefficient of friction f is usedvInstead of f);
alpha-wrap angle, rad, of the belt pulley.
The data obtained by the experiment are put into the above formula, so that the Euler can be verifiedThe correctness of the formula is observed and sensed, the difference between the tension of the loose-side belt and the tension of the tight-side belt is observed and sensed, and the moment borne by the belt wheel and the tension F of the tight-side belt are verified1And the loose edge tension F2The relationship (2) of (c).
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any person skilled in the art can make any simple modification, equivalent change and modification to the above embodiments according to the technical spirit of the present invention without departing from the technical scope of the present invention.
Claims (4)
1. The utility model provides a V takes transmission to measure experimental apparatus which characterized in that: comprises a sensor consisting of a slack side force cell sensor (2), a tight side force cell sensor (9) and a belt wheel friction force sensor (4), an experiment bench (10), a display electrically connected with the sensor through a connecting wire and fixed on the experiment bench (10), a transmission device fixed on the experiment bench (10), a belt wheel (5) arranged on the output end of the transmission device, and a V belt (3) to be measured arranged on the belt wheel (5), one end of the V-shaped belt (3) passes through the slack side force measuring sensor (2), the other end passes through the tight side force measuring sensor (9), the end parts of the V-shaped belts (3) are fixed on the V-shaped belts (3) through adjusting bolts (18), the slack side force measuring sensor (2) and the tight side force measuring sensor (9) are connected with the small hand wheel (1) through a sliding device (20), the input end of the transmission device is connected with a big hand wheel (11) through a connecting rod (19).
2. The V-belt transmission force measurement experiment device according to claim 1, characterized in that: the transmission device comprises a WD worm reducer (7) arranged at the end part of a connecting rod (19), a worm wheel (6) and a worm (8) meshed with the worm wheel (6), one end of the worm (8) is connected with a belt wheel friction force sensor (4) through a sliding bearing (16), the other end of the worm is connected with one end of a magnetic coupling (17) used for avoiding the worm reducer (7) from generating axial force when the worm (8) transmits power through the sliding bearing (16), the other end of the magnetic coupling (17) is connected with the output end of the WD worm reducer (7), and a belt wheel (5) is arranged on an output shaft of the worm wheel (6).
3. The V-belt transmission force measurement experiment device according to claim 1, characterized in that: the display comprises a slack side force measurement display (14) which is electrically connected with the slack side force measurement sensor (2) and used for displaying tension of a slack side of the V belt (3), a tight side force measurement display (13) which is electrically connected with the tight side force measurement sensor (9) and used for displaying tension of the tight side of the V belt (3), and a belt wheel friction display (12) which is electrically connected with the belt wheel friction sensor (4) and used for displaying friction between the belt wheel (5) and the V belt (3).
4. The V-belt transmission force measurement experiment device according to claim 1, characterized in that: the sliding device (20) comprises a sensor connecting plate (20-1) for fixing the slack side force cell sensor (2) and the tight side force cell sensor (9), a sliding table connecting plate (20-2) for fixing the sensor connecting plate (20-1) and a sliding table (20-3) in sliding fit with the sliding table connecting plate (20-2); the sliding table is provided with a screw rod, the end part of the screw rod is provided with a small hand wheel, and the bottom of the sliding table connecting plate is provided with a nut matched with the screw rod.
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| CN201920992162.6U CN209910866U (en) | 2019-06-27 | 2019-06-27 | V-belt transmission force measurement experiment device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110243520A (en) * | 2019-06-27 | 2019-09-17 | 洛阳豪特现代测试技术有限公司 | A kind of V V belt translation power measurement experiment device |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110243520A (en) * | 2019-06-27 | 2019-09-17 | 洛阳豪特现代测试技术有限公司 | A kind of V V belt translation power measurement experiment device |
| CN110243520B (en) * | 2019-06-27 | 2024-03-08 | 洛阳豪特现代测试技术有限公司 | V-belt driving force measurement experiment device |
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