Autonomous assembly type planar motion experiment teaching aid

Abstract

The utility model discloses a self-assembled planar motion experiment teaching aid, and belongs to the field of experiment teaching. The device comprises an assembly part, a connecting part, a driving part and a measuring part. The assembly part comprises a base, a supporting platform, an L-shaped support, a sliding rail, a sliding block, a rod piece and a disc piece. The connecting part comprises a screw, a nut, a counter-locking screw and a gasket, and the driving part comprises a speed regulator, a motor and a power supply. The measuring part comprises a sensor and a monitoring system. A cylindrical boss is arranged in front of the sliding block, a deep hole is formed in the center of the boss, and a threaded sleeve is embedded in the deep hole and used for fixing other subsequent rigid body assemblies. The rod pieces are various strip-shaped plate pieces with the same width and different lengths, through holes are reserved in the two sides of the rod pieces, through holes are reserved in the center and the edge of the disc piece, and the through holes are used for subsequent fixed connection or hinge joint of the rigid body assembly. Through cooperation of the assembly part, the connecting part, the driving part and the measuring part and parameter adjustment, the self-assembled planar motion experiment teaching aid with diversified functions is realized.

Description

Technical Field

[0001] The utility model relates to an autonomous assembly type planar motion experiment teaching aid, belonging to the field of experimental teaching. Background Technique

[0002] Mechanics is a basic subject with strong theoretical nature, and it is also the foundation of engineering disciplines such as aerospace and ordnance. It plays an irreplaceable role in major projects in fields such as the national economy and national defense industry. Theoretical mechanics is a required course for science and engineering majors and is the research foundation of the mechanical category. Theoretical mechanics is an important technical basic course with strong deductiveness, and its main characteristics are the systematicness of theory and the flexibility of application. Therefore, this course not only focuses on the teaching of the derivation and analysis of theoretical models, but also pays more attention to the demonstration and operation of actual models.

[0003] At present, domestic universities mainly carry out experimental teaching content for statics and dynamics in experimental projects. In kinematics, mainly demonstration experiments are carried out. Kinematics involves the motion synthesis between multiple rigid bodies, with abstract content and flexible changes, which is a difficult point and also the focus of mechanism design and analysis.

[0004] The demonstration experiment teaching aids on the market have single functions, non-adjustable parameters, and cannot measure motion. Therefore, in order to enhance students' understanding of abstract concepts such as motion synthesis and increase their understanding of important engineering physical quantities such as speed and acceleration, it is of great significance to carry out kinematics experimental teaching. Content of the Utility Model

[0005] To solve the deficiencies of the existing planar motion teaching aids on the market, such as single functions, lack of observation, and inconvenient storage, the purpose of the utility model is to provide an autonomous assembly type planar motion experiment teaching aid, which is autonomously assembled through a base, a support platform, an L-shaped bracket, a slide rail, a slider, a rod piece, and a disc piece, and through the cooperation and parameter adjustment of the component part, the connection part, the driving part, and the measuring part, to realize a planar motion experiment teaching aid with diverse functions, and further realize a systematic experimental teaching of assembly mechanism - motion observation - data analysis.

[0006] The purpose of the utility model is achieved through the following technical solutions:

[0007] The autonomous assembly type planar motion experiment teaching aid disclosed by the utility model includes a component part, a connection part, a driving part, and a measuring part.

[0008] The component part includes a base, a support platform, an L-shaped bracket, a slide rail, a slider, a rod, and a disc. Among them, the base is a sheet metal part made of steel plate, with 4 threaded holes drilled on it to connect the support platform. The support platform is also a sheet metal part made of steel plate. Hanging ears are welded above the two side columns of the support platform, and threaded holes are drilled in the centers of the hanging ears for connecting the subsequent slide rail assembly. A long through slot is opened above the vertical bracket for fixing the subsequent L-shaped bracket to fix the motor. The L-shaped bracket is a sheet metal part made of steel plate. A through hole matching the long through slot above the vertical bracket is opened on one side of the L-shaped bracket for fixing the bracket to the support platform; a round hole is opened in the center of the other side of the L-shaped bracket for passing through the motor drive shaft, and 4 through holes are opened around the round hole for fixing the drive motor with screws. The slide rail is a long strip-shaped aluminum alloy plate part, with through holes reserved on both sides for fixing the slide rail on the hanging ears of the support platform. The slider is made of aluminum alloy and can be machined by turning. A groove matching the slide rail is provided at the rear of the slider, and a cylindrical boss is provided at the front of the slider. A deep hole is opened in the center of the boss, and a threaded sleeve is embedded for fixing the subsequent other rigid body components. The rod is a strip-shaped plate part with multiple same widths and different lengths, and the disc is a circular plate part. Through holes are reserved on both sides of the rod, and through holes are reserved at the center and edge of the disc. The above through holes are used for subsequent fixing or hinging of the rigid body components.

[0009] The connection part includes screws, nuts, lock screws, and gaskets. Among them, screws are used to fix the support platform on the base, fix the slide rail on the hanging ear, and fix the motor on the L-shaped bracket; long screws are used to fix the driving rigid body component at the end of the motor drive shaft and connect one end of the rigid body component to the center of the slider; screw nuts are used to fix the L-shaped bracket on the support platform; lock screws are used to connect the rigid body components to achieve relative hinging between them, transmit motion acting forces but not torques; gaskets can be used in the gaps at the joints to avoid interference and misalignment during the movement process.

[0010] The driving part includes a speed regulator, a motor, and a power supply. The power supply is connected to the speed regulator, and the speed regulator controls the motor. The speed regulator can control the forward and reverse rotation and steplessly adjust the speed through a knob. The end of the motor drive shaft is designed with internal threads and is connected to the rigid body component through screws. When the screws are tightened, it is a fixed connection and can be used as a drive shaft. When it is loosely hung, it is a hinged connection and can be used as a driven shaft. The teaching aid contains 2 sets of driving parts, which can be used alone as a drive shaft or can be used together as a drive shaft and a driven shaft respectively.

[0011] The measuring part includes a sensor and a monitoring system. The sensor selected is a sensor with an angular velocity measurement function for monitoring the angular velocity of the planar motion of the rigid body; in order to avoid the interference of the data transmission line on the motion during the wall data acquisition process, a sensor with a Bluetooth function is selected and equipped with monitoring software to record the motion data in real time.

[0012] Beneficial effects:

[0013] 1. An independently assembled planar motion experimental teaching aid disclosed by the present utility model forms a systematic experimental teaching function of assembly mechanism - motion observation - data analysis through the mutual cooperation of component parts, connection parts, driving parts, and measurement parts, and forms a planar motion mechanism experimental operation table with diverse functions.

[0014] 2. An independently assembled planar motion experimental teaching aid disclosed by the present utility model, whose component parts include a base, a support platform, an L-shaped bracket, a slide rail, a slider, a rod, and a disc, can realize independent design and assembly, and adjust input parameters through a speed control motor to form a planar motion mechanism with diverse working conditions, facilitating the implementation of group differentiated experimental teaching in the classroom and strengthening the practical link.

[0015] 3. An independently assembled planar motion experimental teaching aid disclosed by the present utility model selects a sensor with angular velocity measurement function and Bluetooth data transmission function for its measurement part, and is equipped with monitoring software, which can solve the problem of interference of the data transmission line on motion during the data acquisition process, monitor motion data in real time, and improve the experimental accuracy.

[0016] 4. An independently assembled planar motion experimental teaching aid disclosed by the present utility model realizes hinged connection between rigid body components through lock screws, so that only force is transmitted between components and no torque is transmitted; fixed connection is realized through screws and nuts, and both force and torque are transmitted. The actual working conditions are consistent with those in the textbook, and it is easy to disassemble, assemble and has low friction, facilitating classroom operation.

[0017] 5. An independently assembled planar motion experimental teaching aid disclosed by the present utility model forms an assembled teaching aid box integrating an operation table and a toolbox under the background of limited existing laboratory area and encouragement of resource reuse, which has the advantages of being load-bearing and easy to store, facilitating the parallel development of courses in the laboratory and the use and management of instruments. Description of the Drawings

[0018] Figure 1 is a schematic diagram of the main component parts of the present utility model;

[0019] Figure 2 is a schematic diagram of the optional rigid body components of the component parts of the present utility model;

[0020] Figure 3 is an application example of the present utility model, where (a) is a planar motion mechanism composed of 3 rods, (b) is a planar motion mechanism composed of 2 rods and 1 disc, and (c) is a planar motion mechanism composed of 2 rods;

[0021] Wherein: 1 - base, 2 - supporting platform, 3 - hanging ear, 4 - slide rail, 5 - slider, 6 - cylindrical boss, 7 - threaded hole, 8 - long through slot, 9 - L-shaped bracket, 10 - motor, 11 - motor drive shaft, 12 - rod member, 13 - disc member. Detailed implementation mode

[0022] In order to better illustrate the purpose and advantages of the present invention, the design scheme of the present invention will be further described below with reference to the accompanying drawings.

[0023] An independently assembled planar motion experiment teaching aid disclosed by the present invention includes a component part, a connection part, a driving part and a measuring part.

[0024] As Figure 1 shown, the main body of the component part includes a base 1, a supporting platform 2, a hanging ear 3, a slide rail 4, a slider 5, and a cylindrical boss 6. Among them, the base 1 is a sheet metal part with a length of 450 mm, a width of 150 mm, and a thickness of 4 mm, made of steel plate, and threaded holes 7 with a diameter of 4 mm are opened thereon to connect the supporting platform 2. The supporting platform is also a sheet metal part made of steel plate with a thickness of 3 mm. Hanging ears 3 are welded above the columns on both sides of the supporting platform, and threaded holes 7 with a diameter of 4 mm are opened at the centers of the hanging ears 3 for connecting the subsequent slide rails 4. A long through slot 8 is opened above the supporting platform 2 for fixing the L-shaped bracket 9 to fix the motor 10. The L-shaped bracket is a sheet metal part made of steel plate with a thickness of 3 mm. A through hole matching the long through slot 8 above the vertical bracket is opened on one side of the L-shaped bracket 9 for fixing the L-shaped bracket 9 to the supporting platform 2; a round hole is opened at the center of the other side of the L-shaped bracket 9 for passing through the motor drive shaft 11. The slide rail 4 is a long strip-shaped aluminum alloy plate part with a length of 394 mm, a width of 20 mm, and a thickness of 3 mm, and through holes are reserved on both sides for fixing the slide rail 4 on the hanging ear 3 of the supporting platform 2. The slider 5 is made of aluminum alloy and can be processed by turning. A groove matching the slide rail 4 is designed at the rear of the slider, and a cylindrical boss 6 is designed at the front of the slider. A deep hole is opened at the center of the boss 6, and a threaded sleeve is embedded therein for fixing optional rigid body components such as a rod member 12 and a disc member 13.

[0025] As Figure 2 shown, the optional rigid bodies of the component part include rod members 12 and disc members 13 with four different lengths. The rod member 12 includes strip-shaped plate parts with lengths of 70 mm, 120 mm, 170 mm, and 220 mm, a width of 20 mm, and a thickness of 3 mm, with chamfers with a radius of 10 mm at both sides, and through holes with a diameter of 4 mm are reserved on both sides for fixing or hinging with other rigid body components; the disc member 13 is a circular plate part with a diameter of 110 mm, and through holes with a diameter of 4 mm are reserved at the center and around the disc member 14 for fixing or hinging with other rigid body components.

[0026] The connecting part includes screws, nuts, lock screws, washers, etc. Among them, the screws are used to fix the support platform 2 on the base 1, fix the slide rail 4 on the lifting lug 3, and fix the motor 10 on the L-shaped bracket 9; the long screws are used to fix the driving rigid body assembly on the end of the motor drive shaft 11 and connect one end of the rigid body assembly to the threaded sleeve of the central boss 6; the screw nuts are used to fix the L-shaped bracket 9 on the support platform 2; the lock screws are used to connect the rigid body assemblies to achieve relative hinge connection between them, transmitting motion force but not torque; washers can be used in the gaps at the joints to avoid interference and misalignment during movement.

[0027] The driving part includes a speed governor, a motor 10, and a power supply. The power supply is connected to the speed governor, and the speed governor controls the motor 10. The speed governor can control forward and reverse rotation and steplessly adjust the speed through a knob. The end of the motor drive shaft 11 output by the motor 10 is designed with internal threads and is connected to the rigid body assembly by screws. When the screws are tightened, it is a fixed connection and can be used as a drive shaft. When it is loosely hung, it is a hinge connection and can be used as a driven shaft. The teaching aid contains 2 sets of driving parts, which can be used alone as a drive shaft or used together as a drive shaft and a driven shaft respectively.

[0028] The measuring part includes sensors and a monitoring system. The sensors selected are sensors with the function of measuring angular velocity, which are used to monitor the angular velocity of the planar motion of the rigid body; in order to avoid interference of the data transmission line on the motion during the data acquisition process, sensors with Bluetooth function are selected and equipped with monitoring software to record the motion data in real time.

[0029] The base 1 plays a stabilizing role for the whole. The support platform 2 is used to connect and fix each component. The support platform 2 and the base 1 are connected by M4*6 screws; the slider 5 is hung on the slide rail 4, and then the slide rail 4 is connected to the support platform 2. The slider interface faces outward, and the slide rail 4 and the lifting lug 3 of the support platform 2 are connected by M4*6 screws; the L-shaped bracket 9 is fixed on the long through groove 8 above the support platform 2 by M3*10 screws and M3 nuts, and then the end of the motor drive shaft 11 passes through the round hole of the L-shaped bracket 9; the speed governor is connected to the motor, and the power cord is connected to the speed governor.

[0030] Students select rigid body components according to the independently designed planar motion mechanism, such as the rod 12, the disc part 13, etc. The rigid body component used as the driving part is connected to the end of the motor drive shaft 11 by M3*10 screws. When the screws are tightened, it is a fixed connection; the other end of the rigid body component used as the driving part is connected to the rigid body component used as the driven part by lock screws. A washer can be added in the middle of the male and female lock screws to prevent spatial misalignment; for the end that needs to connect the slider, M3*20 screws and M3 nuts are selected for hinge connection, and the nut is only used for the limiting function. The assembly case of the autonomous planar motion device is as Figure 3 shown.

[0031] After initially manually adjusting the movement of the autonomous assembly mechanism, the power supply can be turned on to attempt low-speed reciprocating motion. For positions that are not smooth or have jams, the perpendicularity can be restricted by adjusting the clearance of the locking screws, adding gaskets, etc. After the low-speed motion is smooth, the motor can be adjusted to carry out high-speed motion.

[0032] Paste the sensor onto the surface of the rigid body component to be measured through double-sided tape, connect the sensor via Bluetooth to collect motion data, and then conduct a comparative analysis with theoretical calculations to realize a planar motion experimental teaching aid with diverse functions, and further realize a systematic experimental teaching of the assembly mechanism - motion observation - data analysis.

[0033] The above specific description further details the purpose, technical solution, and beneficial effects of the utility model. It should be understood that the above is only a specific embodiment of the utility model and is not used to limit the protection scope of the utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the utility model shall be included within the protection scope of the utility model.

Claims

1. A self-assembling planar motion experimental teaching aid, characterized in that: It includes component part, connection part, driving part and measuring part; The assembly part includes a base (1), a supporting platform (2), a hanging ear (3), a slide rail (4), a slider (5), a cylindrical boss (6), a threaded hole (7), a long through groove (8), an L-shaped bracket (9), a rod (12) and a disc (13); the connecting part includes screws, nuts, locking screws and gaskets; the driving part includes a speed regulator, a motor (10) and a power supply; the measuring part includes a sensor and a monitoring system; The base (1) is a sheet metal part having a threaded hole (7) for connecting to the support platform (2); the support platform (2) is also a sheet metal part; ears (3) are welded above the columns on both sides of the support platform (2), and the center of the ears (3) has a threaded hole (7) for connecting to the slide rail (4) assembly; a long through groove (8) is opened above the vertical bracket for fixing the subsequent L-shaped bracket (9) to fix the motor (10); the L-shaped bracket (9) is a sheet metal part made of steel plate, and one side of the L-shaped bracket (9) has a through hole matching the long through groove (8) above the vertical bracket for fixing the bracket to the support platform (2); a circular hole is opened in the center of the other side of the L-shaped bracket (9) for passing the motor drive shaft (11), and a circular hole is opened around the circular hole The through hole is used to fix the driving motor (10) by screws; the slide rail (4) is a long strip of aluminum alloy plate, and through holes are reserved on both sides for fixing the slide rail (4) on the hanging ear (3) of the supporting platform (2); the slider (5) is formed by turning, and a groove matching the slide rail (4) is provided at the rear of the slider (5), and a cylindrical boss is designed in front of the slider (5), and a deep hole is opened in the center of the boss, and a threaded sleeve is embedded therein, which is used to fix other subsequent rigid body components; the rod (12) is a strip plate of multiple same widths and different lengths, and the disc (13) is a circular plate, and through holes are reserved on both sides of the rod (12), and through holes are reserved in the center and edge of the disc (13), and the above through holes are used for subsequent fixing or hinge connection of the rigid body components.

2. The self-assembling planar motion experimental teaching aid according to claim 1, characterized in that: The base (1) is a sheet metal part made of a steel plate, and has four threaded holes (7) formed thereon for connecting to the supporting platform (2); Four through holes are formed around the central circular hole on the other side of the L-shaped bracket (9) for fixing the driving motor (10) with screws; The sliding block (5) is made of aluminum alloy.

3. The self-assembling planar motion experimental teaching aid according to claim 1, characterized in that: The screws are used to fix the support platform on the base (1), fix the slide rail (4) on the lifting ear, and fix the motor (10) on the L-shaped bracket (9); the long screws are used to fix the driving rigid body component on the end of the motor driving shaft (11) and connect one end of the rigid body component to the center of the slider (5); the screws and nuts are used to fix the L-shaped bracket (9) on the support platform (2); the locking screws are used to connect the rigid body components so that they are relatively hinged and transmit motion force but not torque; the gaskets are used in the gap at the connection to avoid interference and dislocation during the movement of the connection.

4. The self-assembling planar motion experimental teaching aid according to claim 1, characterized in that: The power source is connected to the speed regulator, which controls the motor (10). The speed regulator can control forward and reverse rotation and can adjust the speed steplessly by turning a knob. An internal thread is provided at the end of the motor drive shaft (11), and the internal thread is connected to the rigid body component by screws. The screws are tightened to be fixed and used as a drive shaft, and are loosely hung to be hinged and used as a driven shaft.

5. The self-assembling planar motion experimental teaching aid according to claim 4, characterized in that: The teaching aid comprises 2 sets of driving parts in total; the 2 sets of driving parts can be used as driving shafts alone, or used as a driving shaft and a driven shaft respectively.

6. The self-assembling planar motion experimental teaching aid according to claim 5, characterized in that: The measuring part includes a sensor and a monitoring system; the sensor is selected as a sensor with angular velocity measurement function and Bluetooth function, which is used for angular velocity monitoring of rigid body planar motion.

Images