Gravitational acceleration testing device

Abstract

The utility model discloses a gravitational acceleration testing device, which belongs to the technical field of physical electrics and comprises a base, two vertical plates are fixedly mounted on the upper surface of the base, a transverse plate is fixedly mounted at the top ends of the two vertical plates, an electromagnet is fixedly mounted on the lower surface of the transverse plate, a weight block is magnetically adsorbed on the electromagnet, and the weight block is fixedly mounted on the upper surface of the base. Two sliding sleeves are mounted on the outer surface of the vertical plate in a sliding manner; the electromagnet is arranged to attract the weight block, the weight block is attracted and released through power-on and power-off of the electromagnet, the photoelectric timing sensor is used for timing when the weight block passes, and the speed sensor is used for measuring the speed when the weight block passes. The distance between the upper sliding sleeve and the lower sliding sleeve is marked in cooperation with the graduated scale and the indicating needle, then a more accurate gravitational acceleration value can be obtained, a user does not need to hold the small ball to release the gravitational acceleration, the user does not need to hold a stopwatch to time, and good measurement accuracy is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of physical electricity, and particularly relates to a gravity acceleration testing device. Background Art

[0002] Physical electricity refers to fields including electromagnetic fields, circuits, electricity, etc. When conducting research in the fields of physics and electronics, various experimental tests are required. One of the very important test experiments is the gravity acceleration test. The conventional gravity acceleration test experiment is the free fall experiment, that is, the gravity acceleration is measured by using the process of a small ball freely moving downward with an initial velocity of zero.

[0003] When testing the gravity acceleration, the tester needs to hold a stopwatch in one hand and a small ball in the other hand to conduct the experiment. Inevitably, the phenomenon of asynchronous operation of both hands will occur, which will affect the accuracy of time control, and further affect the accuracy of the subsequent gravity acceleration value. Therefore, we propose a gravity acceleration testing device. Content of the Utility Model

[0004] The purpose of the utility model is to provide a gravity acceleration testing device to solve the problem that when testing the gravity acceleration, the tester needs to hold a stopwatch in one hand and a small ball in the other hand to conduct the experiment. Inevitably, the phenomenon of asynchronous operation of both hands will occur, which will affect the accuracy of time control, and further affect the accuracy of the subsequent gravity acceleration value as mentioned in the above background art.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A gravity acceleration testing device includes a base. Two vertical plates are fixedly installed on the upper surface of the base. The tops of the two vertical plates are fixedly installed with the same cross plate. An electromagnet is fixedly installed on the lower surface of the cross plate. A heavy object block is magnetically adsorbed on the electromagnet. Two sliding sleeves are slidably installed on the outer surface of the vertical plate. Photoelectric timing sensors are fixedly installed on the sides of the two sliding sleeves on one of the vertical plates. Speed sensors are fixedly installed on the sides of the two sliding sleeves on the other vertical plate. The photoelectric timing sensors and the speed sensors on the two sliding sleeves at the same horizontal height position are arranged opposite to each other. A connecting plate is fixedly installed on the sides of the two sliding sleeves at the same horizontal height position. A sliding plate is movably arranged on the side of the connecting plate. Locking rods are fixedly installed at both ends of the sliding plate. Through holes for the locking rods to pass through are formed on the sliding sleeves. A plurality of locking grooves for the locking rods to be inserted into are formed on the side of the vertical plate.

[0006] With the above solution, an electromagnet is set to attract the heavy object block, and the adsorption and release of the heavy object block are realized by the energization and power-off of the electromagnet. The photoelectric timing sensor is used to time when the heavy object block passes by, and the speed sensor is used to measure the speed when the heavy object block passes by. The scale and the pointer are used to mark the distance between the upper and lower sliding sleeves. Furthermore, a more accurate value of the acceleration due to gravity can be obtained. Moreover, there is no need to hold the small ball to release it, nor to hold the stopwatch to time, ensuring good measurement accuracy. By setting the locking rod to cooperate with the sliding sleeve, the upper and lower sliding sleeves can be adjusted in position, and thus the acceleration due to gravity of the heavy object block falling at different distances can be measured multiple times, further improving the test accuracy.

[0007] In the above solution, it should be noted that the electromagnet, the photoelectric timing sensor, and the speed sensor are all electrically connected to an external power supply.

[0008] As a preferred embodiment, adjusting screws are threadedly installed at the four corner positions of the base. The top and bottom ends of the adjusting screws are respectively fixedly installed with operating rods and chassis, and a spirit level is fixedly installed on the upper surface of the base.

[0009] With the above solution, the up and down movement of the chassis can be realized by rotating the adjusting screw, and by cooperating with the spirit level, the overall levelness can be adjusted to ensure a good level state.

[0010] As a preferred embodiment, a connecting frame is fixedly installed on the outer surface of the heavy object block. Two guide sleeves are installed on the connecting frame, and two guide rods are fixedly installed on the upper surface of the base. The guide sleeves are slidably installed on the outer surfaces of the corresponding guide rods.

[0011] With the above solution, the heavy object block and the guide sleeve are connected by the connecting frame, and the guide sleeve and the guide rod cooperate with each other, which can support and guide the up and down movement of the heavy object block, improve the movement stability, and the sliding between the guide bar and the guide rod is smooth sliding, which can avoid the influence of friction.

[0012] As a preferred embodiment, a plurality of limiting rods are fixedly installed on the side surface of the connecting plate. The limiting disks are fixedly installed at the ends of the limiting rods far away from the connecting plate, and springs are fixedly installed between the limiting disks and the connecting plate. The sliding plate is slidably installed on the outer surfaces of the limiting rods.

[0013] With the above solution, the limiting rod and the limiting disk are used in cooperation. The limiting rod can support and guide the sliding of the sliding plate to improve the movement stability. The limiting disk can prevent the sliding plate from disengaging from the limiting rod when sliding. When the locking rod disengages from the locking groove, the spring deforms. Therefore, the elastic force of the spring can be used to drive the locking rod to quickly reset and insert into the locking groove, improving the convenience of the locking operation.

[0014] As a preferred embodiment, a scale is fixedly installed on the side surface of one of the vertical plates. There are openings on two sliding sleeves on the same side as the scale, and the openings are arranged facing the scale. An indicating needle used in cooperation with the scale is fixedly installed on the side surface of the sliding sleeve with the opening.

[0015] With the above solution, by using the indicating needle in cooperation with the scale, the distance between the upper and lower sliding sleeves can be accurately controlled.

[0016] As a preferred embodiment, an anti-slip rubber pad is pasted on the lower surface of the chassis.

[0017] With the above solution, the setting of the anti-slip rubber pad has a good anti-slip and stabilizing effect, avoiding slipping.

[0018] Compared with the prior art, the beneficial effects of the present utility model are:

[0019] This gravitational acceleration testing device attracts a heavy object block by setting an electromagnet, realizes the adsorption and release of the heavy object block by the energization and power-off of the electromagnet, uses a photoelectric timing sensor to time when the heavy object block passes through, uses a speed sensor to measure the speed when the heavy object block passes through, and cooperates with a scale and an indicating needle to mark the distance between the upper and lower sliding sleeves, so as to obtain a more accurate gravitational acceleration value. Moreover, there is no need to hold the small ball to release it, nor to hold a stopwatch to time, ensuring good measurement accuracy;

[0020] This gravitational acceleration testing device is used in cooperation with a locking rod and a sliding sleeve. The upper and lower sliding sleeves can be adjusted in position, and thus the gravitational acceleration of the heavy object block falling at different distances can be measured multiple times, further improving the test accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of the present utility model;

[0022] Figure 2 is a schematic structural diagram of the present utility model from another angle;

[0023] Figure 3 is a schematic structural diagram of the sliding sleeve of the present utility model;

[0024] Figure 4 is a schematic structural diagram of the sliding sleeve of the present utility model from another angle;

[0025] Figure 5 is a schematic structural diagram of the base of the present utility model.

[0026] In the figure: 1, base; 2, vertical plate; 3, horizontal plate; 4, electromagnet; 5, heavy object block; 6, sliding sleeve; 7, photoelectric timing sensor; 8, speed sensor; 9, connecting plate; 10, sliding plate; 11, locking rod; 12, adjusting screw; 13, chassis; 14, spirit level; 15, anti-slip rubber pad; 16, connecting frame; 17, guide sleeve; 18, guide rod; 19, limiting rod; 20, limiting disc; 21, spring; 22, indicating needle; 23, scale. Specific implementation manner

[0027] Please refer to Figures 1-5 , the present utility model provides a gravity acceleration testing device, including a base 1, two vertical plates 2 are fixedly installed on the upper surface of the base 1, the tops of the two vertical plates 2 are fixedly installed with the same horizontal plate 3, an electromagnet 4 is fixedly installed on the lower surface of the horizontal plate 3, a heavy object block 5 is magnetically adsorbed on the electromagnet 4, two sliding sleeves 6 are slidably installed on the outer surface of the vertical plate 2, photoelectric timing sensors 7 are fixedly installed on the sides of the two sliding sleeves 6 on one of the vertical plates 2, speed sensors 8 are fixedly installed on the sides of the two sliding sleeves 6 on the other vertical plate 2, the photoelectric timing sensors 7 and the speed sensors 8 on the two sliding sleeves 6 at the same horizontal height position are arranged oppositely, a connecting plate 9 is fixedly installed on the sides of the two sliding sleeves 6 at the same horizontal height position, a sliding plate 10 is movably arranged on the side of the connecting plate 9, locking rods 11 are fixedly installed at both ends of the sliding plate 10, through holes for the locking rods 11 to pass through are formed in the sliding sleeves 6, and a plurality of locking grooves for the locking rods 11 to be inserted into are formed on the side of the vertical plate 2.

[0028] Adjusting screws 12 are threadedly installed at the four corner positions of the base 1, an operating rod and a chassis 13 are respectively fixedly installed at the top and bottom of the adjusting screw 12, a spirit level 14 is fixedly installed on the upper surface of the base 1, by rotating the adjusting screw 12, the up and down movement of the chassis 13 can be realized, and in cooperation with the spirit level 14, the overall levelness can be adjusted to ensure a good horizontal state.

[0029] A connecting frame 16 is fixedly installed on the outer surface of the heavy object block 5, two guide sleeves 17 are installed on the connecting frame 16, two guide rods 18 are fixedly installed on the upper surface of the base 1, the guide sleeves 17 are slidably installed on the outer surface of the corresponding guide rods 18, the heavy object block 5 and the guide sleeves 17 are connected by the connecting frame 16, and the guide sleeves 17 and the guide rods 18 are used in cooperation to support and guide the up and down movement of the heavy object block 5, improve the movement stability, and the sliding between the guide bar and the guide rod 18 is smooth sliding, which can avoid the influence of friction.

[0030] A number of limiting rods 19 are fixedly installed on the side surface of the connecting plate 9. A limiting disk 20 is fixedly installed at one end of the limiting rod 19 away from the connecting plate 9. A spring 21 is fixedly installed between the limiting disk 20 and the connecting plate 9. The sliding plate 10 is slidably installed on the outer surface of the limiting rod 19. By using the limiting rod 19 in cooperation with the limiting disk 20, the limiting rod 19 can support and guide the sliding of the sliding plate 10, improving the movement stability. The limiting disk 20 can prevent the sliding plate 10 from disengaging from the limiting rod 19 when sliding. When the locking rod 11 disengages from the locking groove, the spring 21 deforms. Therefore, the elastic force of the spring 21 can be used to drive the locking rod 11 to quickly reset and insert into the locking groove, improving the convenience of the locking operation.

[0031] A scale 23 is fixedly installed on the side surface of one of the vertical plates 2. The two sliding sleeves 6 on the same side as the scale 23 have openings, and the openings are arranged facing the scale 23. An indicating needle 22 that cooperates with the scale 23 is fixedly installed on the side surface of the sliding sleeve 6 with an opening. By using the indicating needle 22 in cooperation with the scale 23, the distance between the upper and lower sliding sleeves 6 can be accurately controlled.

[0032] An anti-slip rubber pad 15 is pasted on the lower surface of the chassis 13. The setting of the anti-slip rubber pad 15 has a good anti-slip and stable effect, avoiding slipping.

[0033] During use, by rotating the adjusting screw 12, the chassis 13 is driven to move up and down, and the whole device is adjusted to be horizontal in cooperation with the spirit level 14. First, the distance between the upper and lower sliding sleeves 6 is marked through the indicating needle 22 and the scale 23. Then, the electromagnet 4 is powered off, and at this time, the heavy object block 5 falls. When falling, it passes through the upper and lower photoelectric timing sensors 7 and the speed sensor 8 in sequence. The photoelectric timing sensor 7 is used to time when the heavy object block 5 passes through, and the speed sensor 8 is used to measure the speed when the heavy object block 5 passes through. Furthermore, the gravitational acceleration is measured by using the two times, the two speeds, and the distance difference successively. After one measurement is completed, hold the heavy object block 5 and move it upward to reset, and power on the electromagnet 4 to adsorb the heavy object block 5. Then, adjust the position of the sliding sleeve 6. When adjusting, pull the sliding plate 10, and the sliding plate 10 drives the locking rod 11 to disengage from the locking groove, unlocking the sliding sleeve 6 and holding the sliding sleeve 6 to move up and down. After sliding to the appropriate position, release the sliding plate 10, and use the spring 21 to drive the locking rod 11 to reset and insert into the locking groove to achieve locking. Furthermore, the position of the upper and lower sliding sleeves 6 is adjusted, and then the heavy object block 5 is released again for measurement.

Claims

1. A gravity acceleration testing device, characterized in that: The invention comprises a base (1), wherein two vertical plates (2) are fixedly mounted on the upper surface of the base (1), the tops of the two vertical plates (2) are fixedly mounted with the same horizontal plate (3), the lower surface of the horizontal plate (3) is fixedly mounted with an electromagnet (4), a heavy object block (5) is magnetically adsorbed on the electromagnet (4), and two sliding sleeves (6) are slidably mounted on the outer surface of the vertical plates (2), the sides of the two sliding sleeves (6) on one of the vertical plates (2) are fixedly mounted with a photoelectric timing sensor (7), the sides of the two sliding sleeves (6) on the other vertical plate (2) are fixedly mounted with a speed sensor (8), and the photoelectric timing sensors (7) and the speed sensors (8) on the two sliding sleeves (6) at the same horizontal height are arranged relative to each other. Assume that at the same horizontal height position, the same connecting plate (9) is fixedly installed on the side of two sliding sleeves (6), and a sliding plate (10) is movably provided on the side of the connecting plate (9). Locking rods (11) are fixedly installed at both ends of the sliding plate (10). The sliding sleeve (6) is provided with a through hole for the locking rod (11) to pass through, and the side of the vertical plate (2) is provided with a plurality of locking grooves for the locking rods (11) to be inserted; a connecting frame (16) is fixedly installed on the outer surface of the weight block (5), and two guide sleeves (17) are installed on the connecting frame (16); two guide rods (18) are fixedly installed on the upper surface of the base (1), and the guide sleeves (17) are slidably installed on the outer surface of the guide rods (18) at corresponding positions.

2. The gravity acceleration testing device according to claim 1, characterized in that: Adjustment screws (12) are threadedly mounted at the four corners of the base (1), an operating rod and a chassis (13) are fixedly mounted on the top and bottom ends of the adjustment screws (12), and a level bubble (14) is fixedly mounted on the upper surface of the base (1).

3. The gravity acceleration testing device according to claim 1, characterized in that: A plurality of limit rods (19) are fixedly mounted on the side of the connecting plate (9); a limit plate (20) is fixedly mounted on one end of the limit rod (19) away from the connecting plate (9); a spring (21) is fixedly mounted between the limit plate (20) and the connecting plate (9); and the sliding plate (10) is slidably mounted on the outer surface of the limit rod (19).

4. The gravity acceleration testing device according to claim 1, characterized in that: A scale (23) is fixedly mounted on the side of one of the vertical plates (2), two sliding sleeves (6) on the same side as the scale (23) have openings, and the openings are arranged opposite to the scale (23), and an indicating needle (22) used in conjunction with the scale (23) is fixedly mounted on the side of the sliding sleeve (6) having the opening.

5. The gravity acceleration testing device according to claim 2, characterized in that: An anti-slip rubber pad (15) is adhered to the lower surface of the chassis (13).

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