CN110898375A

CN110898375A - Electromagnetic barbell

Info

Publication number: CN110898375A
Application number: CN201911192202.XA
Authority: CN
Inventors: 侯晓强; 常顺强; 付锦涛; 杨潇; 常社会; 张照阳; 王朋宇
Original assignee: Zhengzhou University
Current assignee: Zhengzhou University
Priority date: 2019-11-28
Filing date: 2019-11-28
Publication date: 2020-03-24
Anticipated expiration: 2039-11-28
Also published as: CN110898375B

Abstract

The invention relates to an electromagnetic barbell, which can effectively solve the problem of insufficient safety and operability of the prior barbell, and adopts the technical scheme that the barbell comprises a grabbing rod and a lifting mechanism, wherein the two ends of the grabbing rod are symmetrically provided with the lifting mechanism, the lifting mechanism comprises a first metal piece wound with a first coil, a second metal piece wound with a second coil, a third metal piece wound with a third coil and a support, the support passes through the third metal piece and is connected with the third metal piece in a sliding way, the top end and the bottom end of the support are respectively fixedly connected with the first metal piece and the second metal piece, the second metal piece is fixed on the ground, the third metal piece is connected with the grabbing rod, and a bidirectional touch switch is arranged on the grabbing rod. Is an innovation of fitness equipment.

Description

Electromagnetic barbell

Technical Field

The invention relates to fitness equipment, in particular to an electromagnetic barbell.

Background

In order to assist people in improving physical fitness, various fitness equipments, such as rowing machines, running machines, and body-building vehicles, in which barbells are commonly used as a core training exercise equipment, are present in the visual field of people.

However, when people use barbells, accidents of being hurt by barbells easily occur, a barbell rack is manufactured for barbells at present, the barbells can be stably placed on the barbell rack by inserting hooks arranged on the barbells into hole structures arranged on two sides of the barbell rack, and therefore the accidents are avoided.

Disclosure of Invention

In view of the above, the present invention provides an electromagnetic barbell, which can effectively solve the problem of insufficient safety and operability of the prior barbell.

The technical proposal of the invention is that the device comprises a grabbing rod and a lifting mechanism, wherein the lifting mechanism is symmetrically arranged at two ends of the grabbing rod and comprises a first metal piece wound with a first coil and a second metal piece wound with a second coil, the third metalwork and the pillar that the winding has the third coil, the pillar passes the third metalwork and is in the same place with third metalwork sliding connection, pillar top and bottom respectively with first metalwork and second metalwork fixed connection together, the second metalwork is fixed subaerial, the third metalwork is connected with the pole of snatching, it is provided with two-way touch switch on the pole to snatch, two-way touch switch includes first touch switch and second touch switch, first touch switch and third coil series connection, form first return circuit, second touch switch and third coil, electric power receiving end series connection, form the second return circuit.

The electromagnetic barbell has the advantages of novel and reasonable structure and strong practicability, not only avoids the problem that a user is injured in the process of using the electromagnetic barbell, but also effectively improves the safety and operability of the barbell, and is an innovation on fitness equipment.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic structural diagram of the lifting mechanism of the present invention.

FIG. 3 is a block diagram of the circuit of the present invention.

FIG. 4 is a diagram of a data transmission structure according to the present invention.

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

As shown in fig. 1-4, the present invention includes a grabbing bar and a lifting mechanism (not shown in the figures as a whole), the two ends of the grabbing bar 8 are symmetrically provided with the lifting mechanism, the lifting mechanism includes a first metal part 11 wound with a first coil (not shown in the figures), a second metal part 9 wound with a second coil (not shown in the figures), a third metal part 10 wound with a third coil, and a pillar 5, the pillar 5 passes through the third metal part 10 and is connected with the third metal part 10 in a sliding manner, the top end and the bottom end of the pillar 5 are respectively fixedly connected with the first metal part 11 and the second metal part 9, the second metal part 9 is fixed on the ground, the third metal part 10 is connected with the grabbing bar 8, the grabbing bar 8 is provided with a two-way touch switch 1, the two-way touch switch 1 includes a first touch switch 201 and a second touch switch 202, the first touch switch 201 is connected with the third coil 203 in series, a first loop is formed, and a second touch switch 202 is connected in series with a third coil 203 and a power receiving end to form a second loop.

The third metal part 10 is connected with the pillar 5 in a sliding manner through the linear bearing 6, and the outer ring of the linear bearing 6 is tightly engaged with the third metal part 10, so that the friction force generated when the third metal part 10 moves upwards or downwards along the pillar 5 can be reduced, and when the third metal part 10 moves upwards or downwards along the pillar 5, the linear bearing 6 slides upwards or downwards along with the third metal part 10, so that the friction force between the third metal part 10 and the pillar 5 is reduced.

A bearing 7 is arranged between the grabbing rod 8 and the third metal part 10, and the bearing 7 is sleeved on the grabbing rod 8 and is arranged in the third metal part 10, so that the grabbing rod 8 can rotate along the axial direction of the grabbing rod with the help of the bearing 7.

The first metal piece 11 and the second metal piece 9 are connected through four brackets 4.

The size of the third metal part 10 is smaller than the size of the first metal part 11 and the second metal part 9, so that the third metal part 10 does not generate friction with the bracket 4 during the upward or downward sliding process.

The first metal element 11, the second metal element 9 and the third metal element 10 may be made of ferromagnetic material, such as but not limited to alloy consisting of iron, cobalt and nickel, which can enhance the electromagnetic force, and the pillar 5 is made of non-ferromagnetic material, which reduces the interference to the magnetic field.

The pillar 5 is a cylinder made of copper or aluminum, but is not limited to copper, aluminum, etc., and those skilled in the art can adjust the material of the pillar and the metal member according to the actual situation, but the adjustment does not exceed the protection scope of the present disclosure.

The first metal piece 11, the second metal piece 9, the third metal piece 10 and the pillar 5 are arranged in the shell 12, specifically, the shell 12 can be made of ferromagnetic material, and the shell 12 can also play a role in shielding a magnetic field, so that the magnetic field generated by the first coil and the second coil is not interfered by the outside; therefore, the movement of the third coil is more stable and controllable. In addition, the shell 12 can eliminate the influence of the magnetic field on the outside; for example, the housing 12 can prevent the magnetic field from damaging the human body, thereby greatly enhancing the safety of the electromagnetic barbell.

A sliding groove 13 in the vertical direction is formed in the shell 12, and the grabbing rod 8 penetrates through the sliding groove 13 to be connected with the third metal piece 10; in the operating state, the gripper bar 8 can be moved upwards or downwards in the sliding groove 13.

The sliding groove 13 is provided with a metal curtain (not shown in the figure), which can play a role of shielding a magnetic field and prevent an external magnetic field from influencing the magnetic field of the lifting mechanism through the sliding groove 13, so that the electromagnetic barbell is more stable in the operation process, and in addition, the metal curtain can eliminate the influence of the magnetic field on the outside; for example, the metal curtain can avoid the damage of the magnetic field to the human body, and greatly enhance the safety of the electromagnetic barbell, and the metal curtain can be made of a ferromagnetic material.

The electromagnetic barbell further comprises a controller 101, a data acquisition group, an input terminal 105 and a controllable power supply 106, wherein the input terminal 105 is used for acquiring weight information input by a user, the controller 101 is used for controlling current output of the controllable power supply 106 according to the weight information, the data acquisition group is used for acquiring relevant information of the electromagnetic barbell, the data acquisition group comprises an acceleration sensor 103, a displacement sensor 102 and a voltage transducer 104, and the displacement sensor 102, the acceleration sensor 103, the voltage transducer 104, the input terminal 105 and the controllable power supply 106 are all connected with the controller 101.

The controller 101 is an 8051 single-chip microcomputer sensor or a PLC programmable logic controller.

The first loop is provided with a resistor 204, the resistor 204 is connected in series with the first touch switch 201 and is connected in parallel with the second touch switch 202 and the power receiving end, and by setting the size of the resistor 204, the descending speed of the grab bar 8 can be effectively controlled when the second loop works.

The controllable power supply 106 is connected in series in the second loop, the controllable power supply 106 is connected in series with the second touch switch 202 and is connected in parallel with the first touch switch 201 and the resistor 204, and the current magnitude borne by the two third coils 203 can be adjusted when the first loop works by adjusting the magnitude of the resistor 204, so that the ampere force borne by the two third coils 203 is effectively controlled, and the descending speed of the grabbing rod is further controlled.

The grabbing rod 8 is of a hollow structure, a wire connected with the third coil 203 is placed in the grabbing rod, A, B, C, D four collecting points are arranged on the wire close to two ends in the grabbing rod (8), a voltage transmitter 104 is arranged at each collecting point, a second voltage transmitter 1042 is arranged between the collecting points A and B, a first voltage transmitter 1041 is arranged between the collecting points C and D, the first voltage transmitter 1041 and the second voltage transmitter 1042 are used for detecting whether the grabbing rod 8 is in electric leakage or power failure, the first voltage transmitter 1041 is used for collecting voltage between C and D, the second voltage transmitter 1042 is used for collecting voltage between A and B, specifically, when the second touch switch 202 is closed and the first touch switch 201 is disconnected, the voltage between A and B, C and D is close to zero, and when the electric leakage or power failure occurs between A and B and/or between C and D, the voltage between a and B and/or between C and D rises, so that it can be determined whether there is a leakage or a power failure between a and B and/or between C and D.

The first touch switch 201 is connected in parallel with a first relay 205, the first relay 205 is connected in series with a resistor 204 and is connected in parallel with a second touch switch 202 and a power receiving terminal, and a second relay 206 is connected in series in a first loop and is connected in parallel with the first touch switch 201, the first relay 205 and the resistor 204.

The main lines of the first circuit and the second circuit are connected in series with a mechanical switch 207, under normal conditions, the mechanical switch 207 is in a normally closed state, and no matter when the first circuit works or when the second circuit works, and an emergency occurs, a user can operate the mechanical switch 207 in time to disconnect the first circuit or the second circuit. Therefore, the safety of the user is ensured, and meanwhile, the safety of the electromagnetic barbell is greatly improved.

The above description is only for the preferred embodiments of the present disclosure and the explanation of the applied technical principle, and it should be understood by those skilled in the art that the scope of the invention related to the embodiments of the present disclosure is not limited to the technical solution of the specific combination of the above technical features, and also covers other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above inventive concept, for example, the technical solutions formed by mutually replacing the above features with (but not limited to) technical features having similar functions disclosed in the embodiments of the present disclosure.

The use condition of the present invention is that, in the working state, the first coil and the second coil are connected with the external power supply to generate a constant magnetic field, the horizontal component of the magnetic field can pass through the center of the third metal part and simultaneously point to or depart from the center point, the magnetic field can provide an upward or downward ampere force for the third coil, the third metal part and the support post are connected together in a sliding way through the linear bearing, the friction force generated when the third metal part moves upward or downward along the support post can be reduced, the power receiving end is used for receiving the external power supply 106 to supply power for the electromagnetic barbell of the present invention, the occurrence of power failure or electric leakage between a and B, and between C and D in the grabbing bar can be detected by arranging the first voltage transmitter 1041 and the second voltage transmitter 1042, thus, the controller of the electromagnetic barbell can control the power supply output in time, effectively improves the safety of the electromagnetic barbell and ensures the safety of users.

In the operating state, when the user grips the grip lever 8, the first touch switch 201 is turned off, the second touch switch 202 is turned on, the second circuit is energized, and the two third coils 203 are energized, and at this time, the two third coils 203 can generate an ampere force by the magnetic field.

When a user releases the grabbing rod 8, the first touch switch 201 is closed, the second touch switch 202 is opened, the first loop is closed, according to the electromagnetic induction phenomenon, the third loop 203 generates induction current in the moving process of the magnetic field, and if the grabbing rod 8 initially moves downwards, the grabbing rod 8 receives an upward ampere force in the moving process to the lowest end; if the initial speed of the grabbing rod 8 is upward, the grabbing rod 8 initially receives downward ampere force, and then receives upward ampere force, and finally the gravity and the ampere force are balanced, the grabbing rod 8 descends at a lower speed, the third coil 203 receives upward ampere force, and further the grabbing rod 8 can slowly descend under the combined action of the ampere force and the gravity, the first loop can ensure that a user releases the grabbing rod 8, the electromagnetic barbell is ready to be stopped, or the hand of the user leaves the grabbing rod 8, the electromagnetic barbell can slowly stop moving, the safety of the electromagnetic barbell is improved, and the safety of the user is ensured.

The safety of the electromagnetic barbell can be effectively improved by arranging the first relay 205, the second current collector 206 and the standard safety value Q0, the problem that a user is injured when the user is lack of physical strength is avoided, the first relay 205 is in a normally open state, the second relay 206 is in a normally closed state, specifically, when the user is lack of physical strength and the hands are still on the grabbing rod, the second touch switch 202 is in a closed state, the second loop is in a connected state, at the moment, the grabbing rod 8 still moves under the action of ampere force, and the user is easy to be injured, therefore, the safety accident is avoided, a standard safety value Q0 can be set, after the controller acquires acceleration information and displacement information through the acceleration sensor and the displacement sensor, whether the current safety value Q is greater than the standard safety value Q0 is determined, if the safety value Q is greater than the standard safety value Q0, the electromagnetic barbell continues to operate. When the safety value Q is less than the standard safety value Q0, the controller energizes the first relay 205 and the second relay 206. At this time, the first relay 205 is closed and the second relay 206 is opened, so that the first loop is closed, and as explained above, the third loop 203 generates an induced current during the movement of the magnetic field according to the electromagnetic induction phenomenon, and if the initial speed of the grabbing bar is downward, the grabbing bar is subjected to an upward ampere force during the movement to the lowest end; if the initial speed of the grabbing rod is upward, the grabbing rod is initially subjected to downward ampere force and then subjected to upward ampere force, finally, the gravity and the ampere force are balanced, and the grabbing rod descends at a lower speed. Furthermore, the grab bar 8 can be slowly lowered under the influence of the ampere force and the gravity, wherein the standard safety value Q0 can be determined by a technician according to trial and error, and the safety value Q can be determined according to acceleration information and/or displacement information of the grab bar. For example, the increase rate of the acceleration and/or the displacement in two consecutive time periods is obtained, and the greater the increase rate is, the lower the corresponding safety value Q is, and the greater the probability of occurrence of the safety accident is represented.

Next, the operation principle of the controller 101 of the electromagnetic barbell will be explained.

After the controller 101 obtains the equivalent mass M from the input terminal, first, the controller 101 obtains a voltage value U of the first voltage transmitter and the second voltage transmitter, determines whether an absolute value of the voltage value U is greater than a voltage safety value U0, determines that the grab bar has an electric leakage or power failure if the voltage value of the first voltage transmitter and/or the second voltage transmitter is greater than the safety voltage safety value U0, and the controller 101 determines the power output to be zero, and then prompts a user to troubleshoot the problems of the first loop and the second loop, if the absolute value of the voltage value of the first voltage transmitter and the second voltage transmitter is not greater than the safety voltage safety value U0, the controller 101 controls the power output to enable the electromagnetic barbell to operate continuously, and meanwhile, the first voltage transmitter and the second voltage transmitter can detect the voltage value continuously, and feeding back the detection result to the controller 101 in real time or in a preset period, where it is to be noted that the preset period is set by a technician according to an actual situation, and the shorter the preset period is, the more the safety of the electromagnetic barbell can be enhanced, and when the voltage value U is greater than the voltage safety value U0, the controller 101 sets the power output to zero to improve the safety of the electromagnetic barbell, and it is to be noted that the voltage safety value U0 may be set by the technician or a value determined through repeated experiments, and the technician in the art may adjust the value according to the actual situation.

In the process of controlling the power output by the controller 101, the controller 101 can acquire displacement information and acceleration information through the displacement sensor and the acceleration sensor, so as to determine a current safety value Q, compare the current safety value Q with a standard safety value Q0, if the safety value Q is greater than a standard safety value Q0, the controller 101 determines the output current according to the displacement information and the acceleration information, specifically, the current is determined by data acquired by the displacement sensor and the acceleration sensor in the current cycle, and the output time lasts until the next cycle, after which, the controller determines the output current again according to the data acquired by the displacement sensor and the acceleration sensor, so as to cycle all the time, the cycle period is about 0.01 second, it should be noted that the displacement sensor and the acceleration sensor feed back the acquired displacement information and acceleration information to the controller 101 according to the cycle period, the controller 101 determines the magnitude of the output current according to the obtained displacement information and acceleration information and continuously outputs the output current until the controller 101 receives the displacement information and acceleration information fed back in the next period, and the controller 101 further adjusts the output current, as will be understood by those skilled in the art, the period of the above cycle may be 0.01 second, but this is not unique, and the cycle period fed back by the displacement information and acceleration information may also be set by the skilled in the art according to the actual situation, on one hand, the shorter the cycle period is, the more times the safety value Q is overlapped, which enhances the safety of the electromagnetic barbell, on the other hand, the shorter the cycle period is, the magnitude of the current output by the controller may gradually approach the ideal value in a stepwise manner, which further enhances the accuracy of the electromagnetic barbell, and furthermore, if the safety value Q is smaller than the standard safety value Q0, at this time, corresponding to the situation that the user does not have enough physical strength but still holds the grabbing rod with both hands, the controller 101 energizes the first relay and the second relay and controls the power supply to make the output of the first relay and the second relay zero, so that, according to the electromagnetic induction phenomenon, the third metal piece generates an induced current in the moving process of the magnetic field, and if the grabbing rod is initially moved downwards, the grabbing rod is subjected to an upward ampere force in the moving process to the lowest end; if the initial speed of the grabbing rod is upward, the grabbing rod initially receives downward ampere force and then receives upward ampere force, finally the gravity and the ampere force are balanced, the grabbing rod descends at a smaller speed, and further the grabbing rod can slowly descend under the action of the ampere force and the gravity.

The specific force analysis is as follows:

f-(F_A+mg)=ma。

f-Mg=Ma。

to obtain F_A=(M-m)(a+g)。

The experiment shows that: f_A= F (I, X), or: i = I (F)_A,X)。

Wherein f represents the force applied by the person to the grab bar, and the upward direction is taken as the positive direction.

F_ARepresenting the downward electromagnetic force to which the grab bar is subjected.

m represents the actual mass of the grab bar, third coil and third metal piece.

M represents the equivalent mass input by the user to the input terminal 105.

a represents the acceleration of the grab bar. Wherein the acceleration a is acquired by an acceleration sensor.

Thus, the controller 101 may determine the electromagnetic force F by the output current according to the equivalent mass M input by the user to the input terminal 105_A。

On one hand, the two ends of the grabbing rod are respectively provided with the lifting mechanism, the first coil and the second coil are connected with an external power supply in a working state to generate a constant magnetic field, the horizontal component of the magnetic field can pass through the center of the third metal piece and simultaneously point to or deviate from the central point, the third coil is subjected to ampere force in the vertical direction by the magnetic field, the mode of replacing a barbell disc with the ampere force is realized, and therefore the safety of the electromagnetic barbell is improved.

On the other hand, the electromagnetic barbell further comprises a first touch switch and a second touch switch, the first touch switch controls the on-off of the first loop, the second touch switch controls the on-off of the second loop, when the second loop is switched on, under the assistance of the power receiving end, the two third coils can move in the vertical direction under the action of the magnetic field, the mode of replacing a barbell sheet in an ampere force mode is realized, the problem that a user is injured in the process of using the electromagnetic barbell is avoided by setting a safety function and matching the touch switch, a relay, a voltage transmitter and the like, accidents in training are avoided, the safety and operability of the barbell are effectively improved, the structure is novel and reasonable, the practicability is strong, innovation on fitness equipment, and good economic and social benefits are achieved.

Claims

1. An electromagnetic barbell comprises a grabbing rod and a lifting mechanism, and is characterized in that the two ends of the grabbing rod (8) are symmetrically provided with the lifting mechanism, the lifting mechanism comprises a first metal piece (11) wound with a first coil, a second metal piece (9) wound with a second coil, a third metal piece (10) wound with a third coil and a strut (5), the strut (5) penetrates through the third metal piece (10) and is connected with the third metal piece (10) in a sliding manner, the top end and the bottom end of the strut (5) are respectively fixedly connected with the first metal piece (11) and the second metal piece (9), the second metal piece (9) is fixed on the ground, the third metal piece (10) is connected with the grabbing rod (8), the grabbing rod (8) is provided with a bidirectional touch switch (1), the bidirectional touch switch (1) comprises a first touch switch (201) and a second touch switch (202), the first touch switch (201) is connected with the third coil (203) in series to form a first loop, and the second touch switch (202) is connected with the third coil (203) and the power receiving end in series to form a second loop.

2. The electromagnetic barbell according to claim 1, wherein the third metal member (10) is slidably connected to the support column (5) via a linear bearing (6), and an outer ring of the linear bearing (6) is tightly engaged with the third metal member (10) to reduce a frictional force generated when the third metal member (10) moves up or down along the support column (5), and when the third metal member (10) moves up or down along the support column (5), the linear bearing (6) slides up or down along the third metal member (10), so as to reduce a frictional force between the third metal member (10) and the support column (5).

3. An electromagnetic barbell as claimed in claim 1, wherein a bearing (7) is provided between the grabbing bar (8) and the third metal member (10), and the bearing (7) is fitted over the grabbing bar (8) and placed in the third metal member (10), so that the grabbing bar (8) can rotate in its axial direction with the aid of the bearing (7).

4. An electromagnetic barbell as claimed in claim 1, wherein the first metal member (11) and the second metal member (9) are connected by four brackets (4).

5. The electromagnetic barbell according to claim 1, wherein the third metal member (10) has a size smaller than the first metal member (11) and the second metal member (9), so that the third metal member (10) does not rub against the bracket (4) during the upward or downward sliding, the first metal member (11), the second metal member (9), and the third metal member (10) are made of ferromagnetic material, the first metal member (11), the second metal member (9), the third metal member (10), and the support (5) are mounted in the housing (12), and the housing (12) is made of ferromagnetic material.

6. The electromagnetic barbell according to claim 5, wherein the housing (12) is provided with a sliding groove (13) in a vertical direction, and the grabbing bar (8) passes through the sliding groove (13) and is connected with the third metal member (10); in the working state, the grabbing rod (8) can move upwards or downwards in the sliding groove (13), and a metal curtain is installed on the sliding groove (13) and made of ferromagnetic materials.

7. The electromagnetic barbell according to claim 1, wherein a resistor (204) is provided in the first circuit, the resistor (204) is connected in series with the first touch switch (201) and in parallel with the second touch switch (202) and the power receiving terminal, the resistor (204) is sized to effectively control the descending speed of the grab bar (8) when the second circuit is operated, the first touch switch (201) is connected in parallel with a first relay (205), the first relay (205) is connected in series with the resistor (204) and in parallel with the second touch switch (202) and the power receiving terminal, the second relay (206) is connected in series in the first circuit and in parallel with the first touch switch (201), the first relay (205) and the resistor (204), a mechanical switch (207) is connected in series in the main circuit of the first circuit and the second circuit, and a controllable power source (106) is connected in series in the second circuit, the controllable power supply (106) is connected with the second touch switch (202) in series and is connected with the first touch switch (201) and the resistor (204) in parallel, and the current borne by the two third coils (203) can be adjusted by adjusting the size of the resistor (204) when the first loop works, so that the ampere force borne by the two third coils (203) is effectively controlled, and the descending speed of the grabbing rod is further controlled.

8. The electromagnetic barbell according to claim 1, wherein the grabbing bar (8) is a hollow structure, a wire connected with the third coil (203) is placed in the grabbing bar, A, B, C, D four collecting points are arranged on the wire near two ends in the grabbing bar (8), the collecting points are provided with voltage transmitters (104), a second voltage transmitter (1042) is arranged between the collecting points A and B, and a first voltage transmitter (1041) is arranged between the collecting points C and D.

9. The electromagnetic barbell according to any one of claims 1 to 8, further comprising a controller (101), a data collection set, an input terminal (105) and a controllable power supply (106), wherein the input terminal (105) is used for acquiring weight information input by a user, the controller (101) is used for controlling the current output of the controllable power supply (106) according to the weight information, the data collection set is used for collecting information related to the electromagnetic barbell, the data collection set comprises an acceleration sensor (103), a displacement sensor (102) and a voltage transmitter (104), and the displacement sensor (102), the acceleration sensor (103), the voltage transmitter (104), the input terminal (105) and the controllable power supply (106) are all connected with the controller (101).

10. The electromagnetic barbell according to claim 9, wherein the controller (101) is an 8051 single chip microcomputer sensor or a PLC programmable logic controller.