A test machine for the moment of inertia of an exercise bicycle

Abstract

The utility model belongs to test equipment technical field, concretely relates to a kind of exercise bicycle moment of inertia testing machine, including frame, the top of frame is equipped with top groove, the inside of top groove is vertically provided with belt, the bottom end of belt is detachably connected with counterweight platform, the both sides of top groove are symmetrically provided with a pair of slide rods, a pair of slide rods are slidably connected with slide platform, the top of slide platform is provided with mounting mechanism, the mounting mechanism includes parallelly arranged two-way screw rod and a pair of guide rods, two-way screw rod and a pair of guide rods are all horizontally arranged in the top of slide platform, the both sides of two-way screw rod are symmetrically connected with a pair of movable frame by screw thread.The utility model has the beneficial effects that by being provided with belt, counterweight platform first slot type photoelectric sensor and second slot type photoelectric sensor, the quick accurate measurement of flywheel moment of inertia can be realized, and measurement accuracy and measurement efficiency are effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of testing equipment technology, specifically a fitness bike moment of inertia testing machine. Background Technology

[0002] As a core component of resistance aerobic exercise equipment such as spin bikes, the flywheel of an exercise bike directly affects the exercise experience and training results. Its core function is to provide inertial energy storage, making the riding process smoother and more natural by storing and releasing kinetic energy, avoiding the feeling of "losing your footing." The weight of the flywheel is a key parameter determining performance; typically, the flywheel of a home-use model weighs between 8-20kg, while professional gym models can weigh over 20kg. Moment of inertia is a physical quantity describing an object's ability to resist angular acceleration, and its value is determined by the mass distribution and the distance from the axis of rotation. To ensure smooth rotation of the exercise bike flywheel, its moment of inertia needs to be accurately measured before assembly.

[0003] However, existing moment of inertia testing machines are relatively complex to operate, have low measurement efficiency, and require different testing machines for flywheels of different sizes and weights, resulting in limited applicability. Utility Model Content

[0004] The purpose of this invention is to solve the problems of low measurement efficiency and difficulty in measuring flywheels of different specifications in existing moment of inertia testing machines.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A stationary bike moment of inertia testing machine includes a frame with a top groove at the top. A belt is vertically installed inside the top groove, and a counterweight platform is detachably connected to the bottom end of the belt. A pair of sliding rods are symmetrically arranged horizontally on both sides of the top groove, and a slide is slidably connected between the pair of sliding rods. A mounting mechanism is provided on the top of the slide, which includes a parallel bidirectional lead screw and a pair of guide rods. The bidirectional lead screw and the pair of guide rods are both horizontally installed on the top of the slide. A pair of movable frames are symmetrically threaded to both sides of the bidirectional lead screw. A placement groove is provided at the top center of the movable frame. A clamp is fixedly connected to the top edge of the movable frame. A limit block is fixedly connected to the movable end of the clamp, and a pressure head is fixedly connected to the bottom center of the limit block.

[0007] Furthermore, the bottom of the movable frame is slidably connected to the guide rod, the end of the bidirectional lead screw is fixedly connected to a handle, and the bottom of the frame is rotatably connected to several rollers.

[0008] Furthermore, an adjusting cylinder is horizontally fixedly connected to the lower top of the movable frame on the side away from the handle, and a push plate is fixedly connected to the piston rod of the adjusting cylinder.

[0009] Furthermore, the slide rod is arranged perpendicularly to the bidirectional lead screw, and a locking component is provided at the connection between the slide table and the slide rod.

[0010] Furthermore, a pair of vertical rods are symmetrically arranged on the inner side of the frame, the counterweight platform is slidably connected to the vertical rods, and a pair of buffers are vertically fixedly connected to the bottom of the frame, the buffers being located at the bottom of the counterweight platform.

[0011] Furthermore, a first slotted photoelectric sensor and a second slotted photoelectric sensor are fixedly connected to the top and bottom of the inner sidewall of the frame, respectively, and a baffle is fixedly connected to the sidewall of the counterweight platform facing the first slotted photoelectric sensor.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] 1. The present invention relates to a fitness bike moment of inertia testing machine, which, by setting up a belt, a counterweight platform, a first grooved photoelectric sensor, and a second grooved photoelectric sensor, can realize rapid and accurate measurement of the moment of inertia of the flywheel, effectively improving measurement accuracy and efficiency.

[0014] 2. The present invention relates to a fitness bike moment of inertia testing machine, which, by setting up a slide table, a two-way lead screw and a movable frame, can realize the installation and measurement of flywheels of different sizes and weights, effectively improving the applicability of the equipment. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of a fitness bike moment of inertia testing machine according to the present invention.

[0016] Figure 2 This is a side view of the rotational inertia testing machine for exercise bikes according to the present invention.

[0017] Figure 3 This is a schematic diagram of the mounting frame structure for a fitness bike moment of inertia testing machine according to the present invention.

[0018] Figure 4 This is a schematic diagram of the internal structure of the frame of a fitness bike moment of inertia testing machine according to the present invention.

[0019] In the diagram: 1. Frame; 2. Top groove; 3. Belt; 4. Counterweight platform; 5. Slide rod; 6. Slide table; 7. Locking assembly; 8. Mounting mechanism; 801. Guide rod; 802. Two-way lead screw; 803. Movable frame; 804. Handle; 805. Clamping clamp; 806. Limit block; 807. Placement groove; 808. Press head; 809. Adjusting cylinder; 810. Push plate; 9. First groove type photoelectric sensor; 10. Second groove type photoelectric sensor; 11. Baffle; 12. Buffer; 13. Roller; 14. Vertical rod. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figures 1-4The exercise bike moment of inertia testing machine of this embodiment includes a frame 1. A top groove 2 is formed at the top of the frame 1. A belt 3 is vertically arranged inside the top groove 2. A counterweight platform 4 is detachably connected to the bottom end of the belt 3. A pair of horizontally symmetrically arranged sliding rods 5 are arranged on both sides of the top groove 2. A slide table 6 is slidably connected between the pair of sliding rods 5. A mounting mechanism 8 is provided on the top of the slide table 6 for mounting and limiting the flywheel under test. The mounting mechanism 8 includes a parallel bidirectional lead screw 802 and a pair of guide rods 801. Both the bidirectional lead screw 802 and the pair of guide rods 801 are horizontally arranged on the top of the slide table 6. A pair of movable frames 803 are symmetrically threaded to both sides of the bidirectional lead screw 802. The top center of the movable frame 803 has a placement slot 807. A clamp 805 is fixedly connected to the top edge of the movable frame 803. A limit block 806 is fixedly connected to the movable end of the clamp 805. A pressure head 808 is fixedly connected to the bottom center of the limit block 806. An adjusting cylinder 809 is horizontally fixedly connected to the lower top of the movable frame 803 on the side away from the handle 804. A push plate 810 is fixedly connected to the piston rod of the adjusting cylinder 809. A first slotted photoelectric sensor 9 and a second slotted photoelectric sensor 10 are fixedly connected to the top and bottom of the inner side wall of the frame 1, respectively. A baffle 11 is fixedly connected to the side wall of the counterweight platform 4 facing the first slotted photoelectric sensor 9.During measurement, firstly, adjust the spacing between the movable frames 803 according to the size of the flywheel to be measured. During adjustment, rotate the double-acting screw 802 to move the movable frames 803 connected by threads on both sides towards each other until the spacing between the placement slots 807 at the top of the movable frames 803 matches the length of the flywheel shaft to be measured. Then, place both ends of the flywheel shaft into the pair of placement slots 807 respectively. Next, drive the push plate 810 to move the flywheel to be measured using the adjusting cylinder 809 until the belt is located in the middle of the flywheel sidewall. Then, press the clamp 805. Tightening causes the limiting block 806 to move to the clamping position. As the limiting block 806 moves, it drives the pressure head 808 at its bottom to move as well, until the pressure head 808 presses down and fixes the bolts at both ends of the flywheel shaft under test, thus achieving the limiting and fixing of the flywheel under test. After the flywheel is fixed, the slide table 6 moves along the slide rod 5 towards the belt 3 until the side wall of the flywheel contacts the vertically arranged belt 3 and stops. At this point, the top end of the belt 3 is wrapped around the outer side wall of the flywheel, and then a counterweight is placed on top of the counterweight platform 4, moving away from the top groove 2. Rotating the flywheel causes the outer belt 3 to move, driving the counterweight platform 4 at the bottom of the belt 3 upwards to the measuring position. At this time, the baffle 11 on the side wall of the counterweight platform 4 is located inside the first slotted photoelectric sensor 9. Then, the flywheel is released, causing the counterweight platform 4 to move the belt 3 downwards under the action of gravity. As the belt 3 moves, it drives the flywheel to rotate in the opposite direction until the baffle 11 on the side wall of the counterweight platform 4 moves to the inside of the second slotted photoelectric sensor 10, blocking the second slotted photoelectric sensor 10. At this time, the first slotted photoelectric sensor... The distance between the second slotted photoelectric sensor 9 and the time difference of the received signal can be used to measure the movement speed of the baffle 11, and then the linear velocity of the flywheel rotation can be measured. Thus, the angular velocity of the flywheel can be calculated based on the flywheel radius. Based on the angular velocity and mass of the flywheel, the moment of inertia of the flywheel can be accurately measured. Through the above steps, the moment of inertia of the flywheel can be measured quickly and accurately, effectively improving the measurement accuracy and efficiency. At the same time, it can be used to install and measure flywheels of different sizes and weights, effectively improving the applicability of the equipment.

[0022] The bottom of the movable frame 803 is slidably connected to the guide rod 801, and a handle 804 is fixedly connected to the end of the bidirectional lead screw 802. Several rollers 13 are rotatably connected to the bottom of the frame 1. The handle 804 facilitates the adjustment of the bidirectional lead screw 802, and the rollers 13 enable quick adjustment of the test machine's position, improving its operational flexibility.

[0023] The slide rod 5 is perpendicular to the double-acting lead screw 802, and a locking component 7 is provided at the connection between the slide table 6 and the slide rod 5. The locking component 7 facilitates the fixation of the slide table 6.

[0024] A pair of vertical rods 14 are symmetrically arranged on the inner side of the frame 1. The counterweight platform 4 is slidably connected to the vertical rods 14. A pair of buffers 12 are vertically fixed to the bottom of the frame 1, and the buffers 12 are located at the bottom of the counterweight platform 4. The buffers 12 can buffer the counterweight platform 4, reduce its impact on the frame 1, and improve the service life of the equipment.

[0025] Working principle: During measurement, firstly, adjust the spacing between the movable frames 803 according to the size of the flywheel to be measured. During adjustment, rotate the double-acting screw 802 to move the movable frames 803 connected by threads on both sides towards each other until the spacing between the top placement slots 807 of the movable frames 803 matches the length of the flywheel shaft to be measured. Then, place both ends of the flywheel shaft into a pair of placement slots 807 respectively. Next, drive the push plate 810 through the adjusting cylinder 809 to move the flywheel until the belt is located in the middle of the flywheel sidewall. Then, press the clamp 8... 05. Tightening causes the limiting block 806 to move to the clamping position. As the limiting block 806 moves, it drives the pressure head 808 at its bottom to move as well, until the pressure head 808 presses down and fixes the bolts at both ends of the flywheel shaft under test, thus achieving the limiting and fixing of the flywheel under test. After the flywheel is fixed, the slide table 6 moves along the slide rod 5 towards the belt 3 until the side wall of the flywheel contacts the vertically arranged belt 3 and stops. At this point, the top end of the belt 3 is wrapped around the flywheel and secured to the outer side wall of the flywheel. Then, a counterweight is placed on top of the counterweight platform 4, and then the counterweight moves away from the top groove 2. The flywheel is rotated in a certain direction, causing the outer belt 3 to move accordingly. This moves the counterweight platform 4 at the bottom of the belt 3 upwards to the measuring position. At this time, the baffle 11 on the side wall of the counterweight platform 4 is located inside the first slotted photoelectric sensor 9. Then, the flywheel is released, causing the counterweight platform 4 to move the belt 3 downwards under the action of gravity. As the belt 3 moves, it causes the flywheel to start rotating in the opposite direction until the baffle 11 on the side wall of the counterweight platform 4 moves to the inside of the second slotted photoelectric sensor 10, blocking the second slotted photoelectric sensor 10. At this time, the first slotted photoelectric sensor... The distance between the sensor 9 and the second slotted photoelectric sensor 10, along with the time difference in signal reception, allows for the measurement of the movement speed of the baffle 11. This, in turn, allows the measurement of the linear velocity of the flywheel's rotation. Based on the flywheel radius, the angular velocity of the flywheel can be calculated. Using the flywheel's angular velocity and mass, the moment of inertia can be accurately measured. Through these steps, rapid and accurate measurement of the flywheel's moment of inertia can be achieved, effectively improving measurement accuracy and efficiency. Furthermore, it enables the installation and measurement of flywheels of different sizes and weights, effectively enhancing the equipment's applicability.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A machine for testing the moment of inertia of an exercise bike, characterized in that: The system includes a frame (1), with a top groove (2) on the top of the frame (1). A belt (3) is vertically installed inside the top groove (2). A counterweight (4) is detachably connected to the bottom end of the belt (3). A pair of sliding rods (5) are symmetrically arranged horizontally on both sides of the top groove (2). A slide table (6) is slidably connected between the pair of sliding rods (5). An installation mechanism (8) is installed on the top of the slide table (6). The installation mechanism (8) includes a parallel bidirectional lead screw (802) and a pair of guide rods (801). The bidirectional lead screw (802) and a pair of guide rods (801) are both horizontally arranged on the top of the slide table (6). A pair of movable frames (803) are symmetrically threaded on both sides of the bidirectional lead screw (802). A placement groove (807) is opened at the top center of the movable frame (803). A clamp (805) is fixedly connected to the top edge of the movable frame (803). A limit block (806) is fixedly connected to the movable end of the clamp (805). A pressure head (808) is fixedly connected to the bottom center of the limit block (806).

2. The exercise bike moment of inertia testing machine according to claim 1, characterized in that: The bottom of the movable frame (803) is slidably connected to the guide rod (801), the end of the bidirectional screw (802) is fixedly connected to a handle (804), and the bottom of the frame (1) is rotatably connected to several rollers (13).

3. The exercise bike moment of inertia testing machine according to claim 2, characterized in that: An adjusting cylinder (809) is horizontally fixedly connected to the lower top of the movable frame (803) on the side away from the handle (804), and a push plate (810) is fixedly connected to the piston rod of the adjusting cylinder (809).

4. The exercise bike moment of inertia testing machine according to claim 1, characterized in that: The slide bar (5) is arranged perpendicularly to the bidirectional lead screw (802), and a locking assembly (7) is provided at the connection between the slide table (6) and the slide bar (5).

5. The exercise bike moment of inertia testing machine according to claim 1, characterized in that: A pair of vertical rods (14) are symmetrically arranged on the inner side of the frame (1). The counterweight platform (4) is slidably connected to the vertical rods (14). A pair of buffers (12) are vertically fixed to the bottom of the frame (1). The buffers (12) are located at the bottom of the counterweight platform (4).

6. The exercise bike moment of inertia testing machine according to claim 1, characterized in that: The top and bottom of the inner sidewall of the frame (1) are respectively fixedly connected to a first slotted photoelectric sensor (9) and a second slotted photoelectric sensor (10), and a baffle (11) is fixedly connected to the sidewall of the counterweight platform (4) facing the first slotted photoelectric sensor (9).

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