阅读说明：本技术 基于圆锥摆的智能重力加速度测量仪 (Intelligent gravity acceleration measuring instrument based on conical pendulum ) 是由 王春伟 王雅萍 王喆 张原硕 蒋帅威 万子豪 潘刚 于 2020-11-26 设计创作，主要内容包括：本发明公开了一种基于圆锥摆的智能重力加速度测量仪,包括：壳体；圆锥摆本体,安装于所述壳体上且能够进行用于测量重力加速度的圆锥摆运动；调水平装置,安装于所述壳体上,用于将所述壳体调整水平；监测装置,安装于所述壳体中,用于监测所述壳体的规格和所述圆锥摆本体中的摆球的位置变化状态；以及测量装置,安装于所述壳体上,用于测量所述摆球的高度和转动周期,并计算得到重力加速度。本发明可以对摆球的运动状态、机架的位置进行测量和监测,确保机架、摆球的实验环境处于最为理想的状态。(The invention discloses an intelligent gravity acceleration measuring instrument based on a conical pendulum, which comprises: a housing; the conical pendulum body is arranged on the shell and can perform conical pendulum motion for measuring the gravity acceleration; the leveling device is arranged on the shell and used for leveling the shell; the monitoring device is arranged in the shell and used for monitoring the specification of the shell and the position change state of the pendulum ball in the conical pendulum body; and the measuring device is arranged on the shell and used for measuring the height and the rotation period of the pendulum ball and calculating to obtain the gravity acceleration. The invention can measure and monitor the motion state of the pendulum ball and the position of the frame, and ensures that the experimental environment of the frame and the pendulum ball is in the most ideal state.)

1. The utility model provides an intelligence acceleration of gravity measuring apparatu based on conical pendulum which characterized in that, intelligence acceleration of gravity measuring apparatu based on conical pendulum includes: a housing (100); a conical pendulum body (200) which is mounted on the housing (100) and which is capable of conical pendulum motion for measuring gravitational acceleration; the leveling device (300) is arranged on the shell (100) and is used for leveling the shell (100); the monitoring device (400) is arranged in the shell (100) and is used for monitoring the specification of the shell (100) and the position change state of the pendulum ball (230) in the conical pendulum body (200); and the measuring device (500) is arranged on the shell (100) and is used for measuring the height and the rotation period of the pendulum ball (230) and calculating the gravity acceleration.

2. The intelligent conical pendulum-based gravitational acceleration measuring instrument according to claim 1, characterized in that the housing (100) comprises: the conical pendulum comprises a bottom plate (101), a top plate (102) arranged in parallel with the bottom plate (101), and a side plate (103) which is arranged between the bottom plate (101) and the top plate (102) and matched with the bottom plate and the top plate to form a space for accommodating the conical pendulum body (200).

3. The intelligent gravitational acceleration measuring instrument based on conical pendulum of claim 2, characterized in that, the conical pendulum body (200) comprises: the driving mechanism (210) is mounted on the top plate (102), the flywheel is connected to the driving mechanism (210), the suspension wire (220) is connected to one end of the flywheel, the swinging ball (230) is connected to the other end of the suspension wire (220), and the control knob (240) is used for controlling the driving motor to be started or closed and is mounted on the side plate (103), wherein the driving mechanism (210) can drive the swinging ball (230) to do conical swinging motion through the flywheel and the suspension wire (220).

4. The intelligent accelerometer based on conical pendulums as claimed in claim 2, wherein the level-adjusting device (300) comprises: a level (310) mounted on the top plate (102) and a height adjustment assembly (320) mounted on the bottom plate (101).

5. The intelligent accelerometer based on conical pendulums as claimed in claim 4, wherein the height adjustment assembly (320) comprises a butterfly bolt (325) and the following components passing through in sequence: a first bushing (321), a bearing (322), a housing (323), and a second bushing (324); wherein:

the first bushing (321), the bearing (322), the shell (323) and the second bushing (324) are all positioned below the bottom plate (101);

the bearing (322) is embedded in the casing (323), the outer side of the bearing is in interference fit with the inner side of the casing (323), and the inner side of the bearing is in interference fit with the outer side of the first bushing (321);

the shaft of the butterfly bolt (325) is in interference fit with the inner rings of the first bushing (321) and the second bushing (324).

6. The conical pendulum-based intelligent gravitational acceleration measuring instrument of claim 5, wherein the height adjustment assembly (320) further comprises: two groups of fixing pieces consisting of nuts and gaskets are respectively arranged at two ends of the butterfly bolt (325), wherein the nuts above the butterfly bolt (325) are embedded into the bottom plate (101).

7. The intelligent cone pendulum-based gravitational acceleration measuring instrument according to claim 2, characterized in that the measuring device (500) comprises: the lifting device (510) is installed on the side plate (103), and the laser sensor (520) and the infrared sensor (521) are installed on the lifting device (510) and can move along with the lifting support (511) in the vertical direction; the side plate (103) is provided with an open slot which can accommodate light rays emitted by the laser sensor (520) and the infrared sensor (521) to pass through, and the length direction of the open slot is the same as the moving direction of the laser sensor (520) and the infrared sensor (521).

8. The intelligent conical pendulum-based gravitational acceleration measuring instrument of claim 7, wherein the lifting device (510) comprises: the device comprises a bracket (511) arranged on the side plate (103), a screw mechanism (512) arranged in the bracket (511) and a photoelectric door platform (513) arranged on the screw mechanism (512) and used for supporting the laser sensor (520) and the infrared sensor (521); wherein the screw mechanism (512) can rotate to drive the photoelectric door platform (513) to move, and the bracket (511) can limit the photoelectric door platform (513) to move along the vertical direction.

9. The intelligent accelerometer based on the conical pendulum of claim 8, wherein the support (511) is formed by splicing a first square column (5111), a first corner beam (5112), a second corner beam (5113), a third corner beam (5114), a first rectangular column (5115) with four open sides and a second square column (5116), wherein the base of the support (511) is formed by splicing 9 first square columns (5111); two first corner beams (5112), two second corner beams (5113) and two third corner beams (5114) are sequentially spliced above four corners of the base of the bracket (511); the first cuboid upright post (5115) is spliced on the tops of the two third corner beams (5114); the top of the bracket (511) is formed by splicing 6 second square columns (5116);

and, the screw mechanism (512) includes: the screw rod (5121) and a lead screw nut (5122) sleeved outside the screw rod (5121), wherein one end of the screw rod (5121) is inserted into the first square column (5111), and the other end of the screw rod (5121) is inserted into the second square column (5116);

and, the photogate platform (513) comprises: a first thin flat plate (5131) as a base of the photogate platform (513); a first platform edge (5132) on one side of the first thin flat plate (5131); a second platform edge (5133) on the other side of the first thin flat plate (5131); a corner block (5134) spliced to said first platform edge (5132) and said second platform edge (5133) and resting on said first thin flat plate (5131); a square flat plate (5135) and a second thin flat plate are spliced above the three-side corner block (5134); a plurality of inclined upright posts (5136) are arranged on the first platform edge (5132) and the second platform edge (5133); the outer side of the first platform edge (5132) is connected with a second cuboid column (5137) which passes through the bracket (511) and is connected to the screw rod (5121), wherein a space for accommodating the laser sensor (520) and the infrared sensor (521) is formed in the center of the inclined columns (5136).

10. The intelligent accelerometer based on conical pendulums as claimed in claim 2, wherein the monitoring device (400) comprises: an ultrasonic monitoring device (401) (400) mounted on the base plate (101) for monitoring the distance between the top plate (102) and the base plate (101) and a machine vision device (402) mounted on the base plate (101) for monitoring the stability of the pendulum ball (230).

Technical Field

The invention relates to the technical field of precision measurement, in particular to an intelligent gravitational acceleration measuring instrument based on a conical pendulum.

Background

For example, the experiment of the simple pendulum meets the experiment principle when the small-amplitude pendulum angle is small (the swing amplitude is less than 5 degrees), the swing amplitude is small, the angle condition is difficult to control, the numerical value is small due to the small swing amplitude, and the simple pendulum is easily interfered by other factors (such as wind speed, friction and the like); the falling ball method errors mainly come from the width of the light blocking sheet, a timing system, manual operation and the like and are difficult to avoid; the swing angle range of the three-wire swing method is small, the cycloid is difficult to meet the requirement of equal length, the stability of the swing track of the swing ball is difficult to ensure by manually releasing the swing ball, and the influence of air damping on the shape of the system and the torsional vibration rate is large.

The prior art discloses a method for measuring gravitational acceleration by using a conical pendulum, and the measuring method has stable effect and is superior. However, in the prior art, the measurement of the gravitational acceleration is only fixed on a motor for experiment, the motion state of the pendulum ball and the position of the frame are not limited under ideal conditions, and the whole measurement result still has large errors.

Disclosure of Invention

The invention aims to provide an intelligent gravity acceleration measuring instrument based on a conical pendulum, which can measure and monitor the motion state of a pendulum ball and the position of a rack, and ensure that the experimental environment of the rack and the pendulum ball is in the most ideal state.

In order to achieve the above object, the present invention provides an intelligent gravitational acceleration measuring instrument based on a conical pendulum, including: a housing; the conical pendulum body is arranged on the shell and can perform conical pendulum motion for measuring the gravity acceleration; the leveling device is arranged on the shell and used for leveling the shell; the monitoring device is arranged in the shell and used for monitoring the specification of the shell and the position change state of the pendulum ball in the conical pendulum body; and the measuring device is arranged on the shell and used for measuring the height and the rotation period of the pendulum ball and calculating to obtain the gravity acceleration.

Preferably, the housing comprises: the conical pendulum comprises a bottom plate, a top plate arranged in parallel with the bottom plate, and a side plate which is arranged between the bottom plate and the top plate and is matched with the bottom plate and the top plate to form a space for accommodating the conical pendulum body.

Preferably, the conical pendulum body comprises: the driving mechanism is arranged on the top plate, the flywheel is connected to the driving mechanism, the suspension wire is connected to the flywheel at one end, the swinging ball is connected to the other end of the suspension wire, the control knob is used for controlling the driving motor to be started or closed and is arranged on the side plate, and the driving mechanism can drive the swinging ball to do conical swinging motion through the flywheel and the suspension wire.

Preferably, the leveling device comprises: the height adjusting device comprises a level arranged on the top plate and a height adjusting assembly arranged on the bottom plate.

Preferably, the height adjustment assembly comprises a butterfly bolt and the following components which penetrate through the butterfly bolt in sequence: a first bushing, a bearing, a housing, and a second bushing; wherein: the first bushing, the bearing, the machine shell and the second bushing are all positioned below the bottom plate; the bearing is embedded into the shell, the outer side of the bearing is in interference fit with the inner side of the shell, and the inner side of the bearing is in interference fit with the outer side of the first bushing; and the shaft of the butterfly bolt is in interference fit with the inner rings of the first bushing and the second bushing.

Preferably, the height adjustment assembly further comprises: two groups of fixing pieces which are respectively arranged at two ends of the butterfly bolt and are composed of nuts and gaskets, wherein the nuts above the butterfly bolt are embedded into the bottom plate.

Preferably, the measuring device comprises: the lifting device is arranged on the side plate, and the laser sensor and the infrared sensor are arranged on the lifting device and can move along the vertical direction along with the lifting support; the side plate is provided with an open slot capable of accommodating light rays emitted by the laser sensor and the infrared sensor to pass through, and the length direction of the open slot is the same as the moving direction of the laser sensor and the infrared sensor.

Preferably, the lifting device includes: the photoelectric door comprises a bracket arranged on the side plate, a screw mechanism arranged in the bracket and a photoelectric door platform arranged on the screw mechanism and used for supporting the laser sensor and the infrared sensor; the screw mechanism can drive the photoelectric door platform to move through rotation, and the support can limit the photoelectric door platform to move in the vertical direction.

Preferably, the support is formed by splicing a first square column, a first corner beam, a second corner beam, a third corner beam, a first cuboid column with four open sides and a second square column, wherein a base of the support is formed by splicing 9 first square columns; the two first corner beams, the two second corner beams and the two third corner beams are sequentially spliced above four corners of the base of the support; the first cuboid stand column is spliced at the tops of the two third corner beams; the top of the bracket is formed by splicing 6 second square columns; and, the screw mechanism includes: the screw rod and the screw nut are sleeved on the outer side of the screw rod, wherein one end of the screw rod is inserted into the first square column, and the other end of the screw rod is inserted into the second square column; and, the photogate platform comprises: a first thin flat plate as a base of the photogate platform; a first platform edge on one side of the first thin flat plate; a second platform edge on the other side of the first thin flat plate; the corner blocks are spliced on the first platform edge and the second platform edge and positioned on the first thin flat plate; a square flat plate and a second thin flat plate are spliced above the three-side corner block; a plurality of inclined upright posts are arranged on the first platform edge and the second platform edge; the outside on first platform limit is connected with and passes the leg joint in second cuboid stand on the hob, wherein the center of a plurality of slope stands is formed with and holds laser sensor and infrared sensor's space.

Preferably, the monitoring device comprises: the device comprises an ultrasonic monitoring device which is arranged on the bottom plate and used for monitoring the distance between the top plate and the bottom plate and a machine vision device which is arranged on the bottom plate and used for monitoring the stability of the pendulum ball.

According to the technical scheme, the conical pendulum body is separated from the outside by the shell, so that the influence of the outside environment on measurement is prevented; leveling the shell (namely a conical pendulum body arranged on the shell) by using a leveling device; the correctness of the shell assembly relation is monitored by using a monitoring device, the stability of the pendulum ball is monitored, and a final gravity acceleration measurement result can be obtained by using a designed measuring device according to the height and the rotation period of the pendulum ball.

Additional features and advantages of the invention will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which 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 principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic exploded view of an intelligent gravitational acceleration measuring instrument based on a conical pendulum according to the present invention;

FIG. 2 is a schematic diagram illustrating the principles of the present invention for calculating gravitational acceleration;

FIG. 3 is a top view of a conical pendulum based intelligent gravitational acceleration measuring instrument according to the present invention;

FIG. 4 is a schematic diagram illustrating the construction of the height adjustment assembly of the present invention;

FIG. 5 is a schematic view illustrating the construction of a lifting device of the present invention; and

FIG. 6 is a schematic cross-sectional view illustrating the elevating device of the present invention

Description of the reference numerals

100. A housing; 200. a conical pendulum body; 300. a leveling device; 400. a monitoring device; 500. a measuring device; 101. a base plate; 102. a top plate; 103. a side plate; 104. a butterfly hinge; 105. a handle; 106. a display; 107. a pull ring; 210. a drive mechanism; 220. a suspension wire; 230. placing a ball; 240. a control knob; 310. a level gauge; 320. a height adjustment assembly; 321. a first bushing; 322. a bearing; 323. a housing; 324. a second bushing; 325. a butterfly bolt; 401. an ultrasonic monitoring device; 402. a machine vision device; 510. a lifting device; 520. a laser sensor; 521. an infrared sensor; 511. a support; 512. a screw mechanism; 513. a photogate platform; 5111. a first cube column; 5112. a first corner beam; 5113. a second corner beam; 5114. a third corner beam; 5115. a first rectangular solid column; 5116. a second cube column; 5121. a screw rod; 5122. a lead screw nut; 5131. a first thin flat plate; 5132. a first platform edge; 5133. a second platform edge; 5134. a corner block with three sides; 5135. a square plate; 5136. inclining the upright post; 5137. a second cuboid pillar.

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

In the present invention, unless otherwise specified, the directional words included in the terms such as "up, down, left, right" and the like merely represent the directions of the terms in a conventional use state or are colloquially known by those skilled in the art, and should not be construed as limiting the terms.

Fig. 1 is a schematic structural diagram of an intelligent gravitational acceleration measuring instrument based on a conical pendulum according to the present invention, and as shown in fig. 1, the intelligent gravitational acceleration measuring instrument based on a conical pendulum includes: the shell 100, the function of the shell 100 ensures that the conical pendulum body 200 can maintain a stable environment from the outside; a conical pendulum body 200 mounted on the housing 100 and capable of performing conical pendulum motion for measuring gravitational acceleration, wherein the conical pendulum body 200 is a structure already used in the prior art; the leveling device 300 is mounted on the housing 100, and is used for leveling the housing 100, and the leveling device 300 is mounted on the housing 100, and is mainly used for leveling the housing 100, so as to obtain a more accurate measurement result; a monitoring device 400 installed in the casing 100 for monitoring the specification of the casing 100 and the position change state of the pendulum ball 230 in the conical pendulum body 200, wherein the monitoring device 400 is used for monitoring whether the structure of the casing 100 is deformed, that is, whether the structure of the casing 100 is deformed due to long-term use, and in addition, the monitoring device 400 has machine vision, can perform visualization effect on the position change state of the pendulum ball 230, and ensures whether the pendulum ball 230 is stable; and a measuring device 500 installed on the housing 100 for measuring the height and the rotation period of the pendulum ball 230 and calculating the gravity acceleration. The manner of calculating the gravitational acceleration using the height and period of the pendulum ball 230 is conventional, and the specific theory is as follows with reference to fig. 2.

By utilizing Newton's law of motion, in order to make the rotation of the pendulum ball 230 more stable under experimental conditions, the pendulum ball is fixed on the flywheel through the suspension wire 220, and the pendulum ball 230 and the flywheel are driven to rotate at a common angular velocity, so that the experimental phenomenon is more obvious, and the experimental result is more stable.

At this time, the pendulum ball 230 does not move circularly around a certain point, and the parameters to be measured are changed, so the experimental principle is improved, and the parameters related to the conical pendulum are obtained by using a similar triangle, so that the gravity acceleration is calculated. The pendulum ball 230 makes a circular motion around the rod, where L in fig. 2 represents the length of the cycloid plus the radius of the pendulum ball, and L in fig. 2 represents the length of the ideal suspension point to the center of the sphere.

The stress analysis can obtain:

Fcosθ＝mg

the gravity acceleration g is solved as follows:

according to the geometrical relationship, the following steps are carried out:

solving to obtain x as:

therefore:

therefore, the experiment only needs to measure the radius l of the true suspension line 220 and the pendulum ball 230, the radius r of the flywheel, the height h and the period T, and the numerical value of the gravity acceleration can be calculated. The experiment does not need to measure the real radius R of the circular motion of the pendulum ball 230, and only needs to simply measure the physical quantity, so that the experiment is convenient and rapid, and the operation is simple.

Preferably, as shown in fig. 1, the housing 100 may include: the pendulum comprises a bottom plate 101, a top plate 102 arranged in parallel with the bottom plate 101, and a side plate 103 which is arranged between the bottom plate 101 and the top plate 102 and is matched with the bottom plate and the top plate to form a space for accommodating the conical pendulum body 200. The shell 100 is a hollow structure and can accommodate the conical pendulum body 200, wherein the side plates 103 are further provided with handles 105 which are convenient for a user to lift, wherein 4 side plates 103 are connected through butterfly hinges 104, so that the fixing of the 4 side plates 103 is realized, and in addition, the bottom plate 101, the top plate 102 and the side plates 103 are also fixedly connected through the butterfly hinges 104, so that the fixing of the whole shell 100 is ensured. The outer side of the side plates 103 is further provided with a display 106 for displaying the result of the finally calculated gravitational acceleration, and the outer side of the side plates 103 is further provided with a pull ring 107 for facilitating the user to open one of the side plates 103.

Preferably, as shown in fig. 3, the conical pendulum body 200 may include, in a top view: the driving mechanism 210 is mounted on the top plate 102, the flywheel is connected to the driving mechanism 210, the suspension wire 220 is connected to the flywheel at one end, the pendulum ball 230 is connected to the other end of the suspension wire 220, and the control knob 240 is used for controlling the driving motor to be turned on or off and is mounted on the side plate 103, wherein the driving mechanism 210 can drive the pendulum ball 230 to make a conical pendulum motion through the flywheel and the suspension wire 220. As shown in fig. 3, the driving mechanism 210 includes a driving motor and a coupling, wherein a rotor of the motor is connected to the coupling to transmit power.

Preferably, the leveling device 300 includes: a level 310 mounted on the top plate 102 and a height adjustment assembly 320 mounted on the bottom plate 101. The level gauge 310 can well display the level condition of the whole casing 100, and in addition, the height adjustment is realized through the designed height adjustment assembly 320, and the height adjustment assembly 320 is arranged at one side of the bottom plate 101 (in order to facilitate the level adjustment of the casing 100).

The height adjustment assembly 320 of the present invention is described in detail below with reference to fig. 4, wherein fig. 4 is an exploded view of the height adjustment assembly 320, and as shown in fig. 4, the height adjustment assembly 320 includes a thumb screw 325 and the following components passing therethrough in sequence: a first bushing 321, a bearing 322, a housing 323, and a second bushing 324; wherein: the first bushing 321, the bearing 322, the housing 323 and the second bushing 324 are all located below the bottom plate 101; the bearing 322 is embedded in the housing 323, and the outer side thereof is in interference fit with the inner side of the housing 323, and the inner side thereof is in interference fit with the outer side of the first bushing 321; the shaft of the butterfly bolt 325 is interference-fitted with the inner rings of the first and second bushings 321 and 324. According to the invention, the butterfly bolt 325 is screwed into the nut of the bottom plate 101, when the nut is relatively fixed in the bottom plate 101, the butterfly bolt 325 only needs to be rotated to realize the height adjustment of the bottom plate 101 of the shell 100, wherein one end of the shell 323 is contacted with the ground, and the length of the butterfly bolt 325 in the shell 100 can be changed by rotating the butterfly bolt 325, so that the heights of the bottom plate 101 and the ground can be changed. The housing 323 is a 3D printed product.

Preferably, as shown in fig. 4, the height adjusting assembly 320 may further include: two sets of fixing members respectively disposed at both ends of the thumb screw 325 and each including a nut and a washer, wherein the nut disposed above the thumb screw 325 is embedded in the bottom plate 101.

Preferably, as shown in fig. 5 and 6, the measuring device 500 may include: a lifting device 510 mounted on the side plate 103, and a laser sensor 520 and an infrared sensor 521 mounted on the lifting device 510 and capable of moving in the vertical direction with the lifting bracket 511; an open slot capable of allowing light rays emitted by the laser sensor 520 and the infrared sensor 521 to pass through is formed in the side plate 103, and the length direction of the open slot is the same as the moving direction of the laser sensor 520 and the infrared sensor 521. The lifting device 510 can be directly fixed on the side surface of the side plate 103 through a bolt, the lifting direction of the lifting device 510 is vertical, and the lifting device can drive the laser sensor 520 and the infrared sensor 521 to move in the vertical direction, so that the height and period measurement is realized. Wherein all individual components of the measuring device 500 of the present invention are 3D printed products.

Preferably, as shown in fig. 5 and 6, the lifting device 510 may include: a bracket 511 mounted on the side plate 103, a screw mechanism 512 disposed inside the bracket 511, and a photo-gate platform 513 mounted on the screw mechanism 512 for supporting the laser sensor 520 and the infrared sensor 521; the screw mechanism 512 can rotate to drive the photoelectric door platform 513 to move, and the support 511 can limit the photoelectric door platform 513 to move in the vertical direction. The support 511 is used to support all the measuring devices 500, the screw mechanism 512 is used to move the photogate platform 513 up and down, and the moving direction of the photogate platform 513 is only the vertical direction, as shown in fig. 1, an open slot for allowing light to pass through is arranged on the side plate 103.

Preferably, the bracket 511 is formed by splicing a first square column 5111, a first corner beam 5112, a second corner beam 5113, a third corner beam 5114, a first cuboid column 5115 with four open sides, and a second square column 5116, wherein the base of the bracket 511 is formed by splicing 9 first square columns 5111; two first corner beams 5112, two second corner beams 5113 and two third corner beams 5114 are sequentially spliced above four corners of the base of the bracket 511; the first cuboid upright 5115 is spliced on the tops of the two third beams 5114; the top of the bracket 511 is formed by splicing 6 second square columns 5116; the length of the first corner beam 5112 is 120mm, the length of the second corner beam 5113 is 60mm, and the length of the third corner beam 5114 is 30 mm.

The screw mechanism 512 may include: a screw rod 5121 and a lead screw nut 5122 sleeved outside the screw rod 5121, wherein one end of the screw rod 5121 is inserted into the first square column 5111, and the other end is inserted into the second square column 5116; the above-described structure enables the relative fixation of the screw rod 5121. In addition, the up-and-down movement of the photogate platform 513 can be realized by rotating the screw rod 5121, and the screw rod 5121 is fixed only in position and does not affect the rotation thereof.

The photo gate platform 513 may include: a first thin flat plate 5131 as a base of the photogate platform 513; a first flat land edge 5132 on the first thin flat plate 5131 side; a second flat plate edge 5133 at the other side of the first thin flat plate 5131; a three-sided corner block 5134 spliced to the first platform edge 5132 and the second platform edge 5133 and disposed on the first thin flat plate 5131; a square flat plate 5135 and a second thin flat plate are spliced above the three-side corner block 5134; a plurality of inclined upright posts 5136 are arranged on the first platform edge 5132 and the second platform edge 5133; a second rectangular solid column 5137 connected to the screw rod 5121 through the bracket 511 is connected to the outer side of the first platform edge 5132, wherein a space for accommodating the laser sensor 520 and the infrared sensor 521 is formed at the center of the plurality of inclined columns 5136.

Preferably, the monitoring device 400 includes: the device comprises an ultrasonic monitoring device 401400 which is arranged on the bottom plate 101 and is used for monitoring the distance between the top plate 102 and the bottom plate 101 and a machine vision device 402 which is arranged on the bottom plate 101 and is used for monitoring the stability of the pendulum ball 230, wherein 4 ultrasonic monitoring devices 401400 are respectively arranged on the bottom plate 101.

The invention perfects the theory, fully considers the motion situation of the pendulum ball, utilizes the parallel trajectory circle and the flywheel circle to form two similar cones, and optimizes the cone pendulum principle through the section similar triangle. The principle considered by the invention is different from the prior art, and is considered more fully than the prior art.

In addition, the device of the invention is easy to operate, the gravity acceleration at the moment can be displayed in the display screen after the switch is turned on and the ball 230 to be swung rotates stably, the automation and the intelligence of the device are realized, the measuring time is shorter, the measuring time is shortened under the condition of optimizing as much as possible, the time required by the measuring period is reduced by the laser sensor 520, meanwhile, the numerical value read by the laser sensor 520 is directly reflected into a computer program for calculation through a series of data acquisition devices and program algorithms, the calculation result is displayed through the display screen, the time for considering the measurement and the calculation is greatly reduced, the experimental device has high efficiency and high cost performance, and the automation of the device is realized.

In addition, the device can not only realize the measurement of the gravity acceleration relatively quickly, but also be very suitable for physical demonstration experiments and can be used as an experiment teaching aid, the device is suitable for teaching tools of students in science and technology departments by combining the knowledge of physical principles, mechanical design principles, automatic acquisition devices, program compiling and the like, and has good teaching and practical significance, so that the device has a large popularization range and high popularization value, not only enables the students to better understand the cone pendulum experiment principle, improves the learning interest, develops the observation ability and thinking ability of the students, but also enables the students to better know the automatic intelligent device, and has good innovation education significance and higher cost performance. A good experimental device for automatically measuring the gravitational acceleration does not exist in the market, so that the device has a good market prospect, and has high economic benefits by combining the low cost and the wide popularization range of the device.

The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.