CN204073259U - Treadmill - Google Patents

Abstract

The utility model relates to the control of motor, and being intended to solve existing treadmill cannot the problem of automatic speed regulation.For this purpose, the utility model provides a kind of treadmill, and this treadmill comprises: treadmill belt tension detector, and it is for the treadmill belt tension force in the foothold front and rear of detecting sporter; And motor speed controller, it is communicated with the motor of treadmill with treadmill belt tension detector, for carrying out the rotating speed of auto-controlled motor according to the output signal of treadmill belt tension detector.Output signal due to treadmill belt tension detector can reflect the potential speed governing demand of sporter, therefore, automatic speed governing device of the present utility model can the acceleration of automatic decision sporter and deceleration demand correspondingly regulate, and without any need for manual operation, thus eliminate manually operated inconvenience and relative danger.

Description

electric treadmill

technical field

The utility model relates to motor control, in particular to an electric treadmill.

Background technique

According to statistics, every time you run 1,000 meters on land, your legs have to hit the ground 600-700 times. Not only will the muscles of the feet, legs and buttocks be shaken, but it is also easy to sprain muscles or strain ligaments. The electric treadmill is a kind of fitness equipment that assists people in running and walking. Because the driving belt is made of rubber, the impact on the joints of the legs and feet is much less than that of the running road, and it is not easy to cause injuries, so as to ensure the scientific and safe exercise. .

The operation panel of existing electric treadmill is all provided with a plurality of windows, shows the runner's running speed, time, mileage, consumed calories, heart rate etc. respectively. In addition, the operation panel is often equipped with acceleration and deceleration buttons, and some treadmills are also equipped with graded constant speed buttons for athletes to adjust the speed. However, whether it is the acceleration and deceleration buttons, or the stepped speed control buttons, there is a common problem. That is, these buttons all need to be manually adjusted by the sportsman. For sportsmen with visual impairment or high-speed running, this manual operation is extremely inconvenient and sometimes even dangerous.

Therefore, there is a need in the art for an electric treadmill that can automatically adjust the speed, which can automatically judge the acceleration and deceleration needs of the athlete and adjust accordingly without any manual operation by the athlete, thereby eliminating the inconvenience of manual operation and the dangers associated with it.

Utility model content

The utility model aims to solve the above problems. Specifically, the utility model aims to solve the problem that the existing electric treadmill cannot automatically adjust the speed. For this purpose, the utility model provides an electric treadmill. The electric treadmill comprises a main frame, a motor, a driving roller, a driven roller, a running board and a running belt. The main frame includes a column and a horizontal support. The rollers are connected and provide power for them. The driven roller and the driving roller are arranged at the other end of the horizontal support oppositely. The running board extends between the driving roller and the driven roller and is interposed between the two side rails of the horizontal support. The belt is wrapped around the drive and driven rollers and laid on the running deck. The automatic speed regulating device is characterized in that it comprises: a running belt tension detector, which is used for real-time detection of the running belt tension in front of and behind the athlete's foothold; and a motor speed controller, which is connected with the running belt tension detector and The motor is connected to control the rotation speed of the motor according to the output signal of the running belt tension detector, wherein, when the running belt tension detector detects that the running belt tension and movement When the difference between the tension of the running belt behind the foothold of the person reaches a certain threshold, the motor speed controller commands the motor to accelerate or decelerate.

In the case of adopting the technical solution of the present utility model, when the athlete runs or walks on the treadmill, if it is necessary to slow down, the athlete slows down. Speed, the running belt drags the athlete's legs to run backwards to a certain extent. In this case, if the foothold of the athlete is used as a benchmark, the running belt tension detector will detect that the tension of the running belt in front of the foothold is smaller than that behind the foothold, which indicates that the athlete intends to lower the tension of the treadmill. speed, at this moment, the motor speed controller can directly reduce the speed of the motor according to the output signal of the running belt tension detector, without the need for manual operation by the sportsman. On the contrary, if needs to accelerate, then the sportsman quickens the pace, and at this moment, because the movement speed of the sportsman's stepping leg is higher than the transmission speed of the running belt, the running belt is dragged by the sportsman's leg to a certain extent and moves backward. In this case, if the athlete’s foothold is used as a benchmark, the running belt tension detector will detect that the tension of the running belt in front of the foothold is greater than that behind the foothold, which indicates that the athlete intends to increase the running speed of the treadmill. speed, at this moment, the motor speed controller can directly increase the speed of the motor according to the output signal of the running belt tension detector, without manual operation by the sportsman. What needs to be pointed out about this point is that no matter whether it needs to accelerate or decelerate, the movement does not need to be too large when speeding up or slowing down, as long as the running belt tension detector can detect the tension change before and after the foothold. . Otherwise, especially if the pace needs to be slowed down due to the need to slow down, excessive amplitude may cause the athlete to fall off the treadmill.

In a preferred embodiment of the above-mentioned electric treadmill, when the running belt tension detector detects that the running belt tension in front of the foothold of the athlete is greater than the running belt tension behind the foothold and the difference between the two reaches a certain threshold , the motor speed controller commands the motor to accelerate, and wherein, when the running belt tension detector detects that the running belt tension in front of the foothold of the athlete is smaller than the running belt tension behind the foothold and the relationship between the two When the difference between them reaches a certain threshold, the motor speed controller commands the motor to decelerate.

Ideally, when an athlete runs or walks on a treadmill, the tension on the running belt before and after the foothold should be approximately equal. Therefore, if the running belt tension detector detects that the tension of the running belt before the foothold is greater than the tension of the running belt behind the foothold, it indicates that the athlete intends to accelerate; Tension indicates that the athlete intends to slow down. However, due to individual differences in each athlete, the difference in tension before and after the foothold may vary. Therefore, for each athlete, the above-mentioned threshold may also be different, and may even be negative in extreme cases. For example, for some athletes, they usually like to be dragged by the running belt to run or walk. Under normal circumstances, the tension of the running belt before the foothold is significantly smaller than that after the foothold. When picking up the pace, the belt tension may also be slightly less before the foothold than after the foothold. In this case, for this athlete, the above-mentioned threshold value for acceleration is a negative value. Of course, this special situation can be solved by the parameter setting device of the present invention, please refer to the detailed description below for details.

In a preferred embodiment of the above-mentioned electric treadmill, the running belt tension detector includes a plurality of running belt tension sensors, and the running belt tension sensors are arranged on the running board below the running belt for detecting the tension of various parts of the running belt. tension. The running belt tension sensor preferably adopts a non-contact tension sensor, and these sensors can be densely arranged on the running board so as to cover various positions of the running belt, so that no matter where the athlete's foothold is on the running belt, the The above-mentioned sensors can all accurately detect the running belt tension before and after the athlete's foothold.

In the preferred embodiment of the above-mentioned electric treadmill, the electric treadmill also includes two pairs of bearings, the main frame also includes two pairs of bearing housings arranged on the horizontal support, and the driving roller and the driven roller respectively pass through the The two pairs of bearings and bearing seats are connected to the main frame, wherein the running belt tension detector includes a plurality of pressure sensors, and the pressure sensors are arranged between the bearings and the bearing seats and are located near the center of the running board and wherein, when the pressure detected by the pressure sensor between the bearing of the driving roller and the bearing seat is greater than the pressure detected by the pressure sensor between the bearing of the driven roller and the bearing seat and between the two When the difference between them is greater than a certain threshold, the motor speed controller commands the motor to accelerate; and when the pressure detected by the pressure sensor between the bearing of the driving roller and the bearing housing is less than the bearing When the pressure detected by the pressure sensor between the bearing seat and the pressure sensor and the difference between them is greater than a certain threshold, the motor speed controller commands the motor to decelerate.

Those skilled in the art can easily understand that the tension of the running belt can be detected directly, or can be detected through the force applied by the running belt to the driving roller or the driven roller. Specifically, no matter in a stationary state or in a moving state, as long as the running belt is installed in place, it will exert a certain force on the driving roller and the driven roller, and this force will be directly reflected on the supporting driving roller And between the bearing of the driven roller and the bearing seat arranged on the horizontal support. If a pressure sensor is installed at an appropriate position between the bearing and the bearing seat, the pressure exerted by the driving roller and the driven roller on the horizontal support (especially to the bearing seat) can be detected, thereby indirectly detecting the pressure exerted by the running belt. The pressure on the driving roller and the driven roller is then converted to the tension of the running belt. More specifically, ideally, when an athlete runs or walks on a treadmill, the tension of the running belt before and after the foothold should be roughly equal. Correspondingly, the pressure that the running belt before the foothold applies to the driving roller and the pressure that the running belt behind the foothold applies to the driven roller are also approximately equal. Therefore, if the pressure detected by the pressure sensor between the bearing of the driving roller and the chock is greater than the pressure detected by the pressure sensor between the bearing of the driven roller and the chock, it indicates that the running belt tension before the foothold is greater than the foothold If the pressure detected by the pressure sensor between the bearing of the driving roller and the bearing seat is less than the pressure detected by the pressure sensor between the bearing and the bearing seat of the driven roller , it indicates that the tension of the running belt before the foothold is smaller than that after the foothold, thus indicating that the athlete intends to slow down. Of course, as mentioned above, due to individual differences among different athletes, the tension difference before and after the foothold may be different, so the difference reflected in the output values of the front and rear pressure sensors may also be different.

In a preferred embodiment of the above-mentioned electric treadmill, the running belt tension detector includes four pressure sensors, two of which are arranged between the bearing of the driving roller and the bearing housing, and the other two are arranged on the driven roller. Between the roller bearing and the housing.

Compared with the above-mentioned technical solution of directly detecting the tension of the running belt, this way of using the pressure sensor to detect the pressure applied to the bearing seat by the driving roller and the driven roller can greatly reduce the number of sensors used. And, because described pressure sensor is arranged between the bearing of driving roller and driven roller and bearing housing, its stability and durability are obviously higher than the running belt tension sensor that is arranged on running board. In addition, in terms of technical maturity, pressure sensors are much more mature than tension sensors.

In a preferred embodiment of the above-mentioned electric treadmill, the electric treadmill also includes a parameter setter, which is used to read the detection result of the running belt tension detector when the athlete first steps on the treadmill and A tension threshold or a pressure threshold dedicated to the athlete is set according to the detection result.

As mentioned above, there are individual differences among different athletes, and the tension difference of the running belt before and after the foothold may be different. Therefore, for each athlete, the thresholds in the above technical solutions may also be different. For example, for some athletes, they usually like to be dragged by the running belt to run or walk. Under normal circumstances, the tension of the running belt before the foothold is significantly smaller than that after the foothold. , the running belt tension before the foothold may also be slightly smaller than the running belt tension behind the foothold. Taking this into account, different tension or pressure thresholds need to be determined for different athletes. The above parameter setting device of the utility model can read the detection result of the running belt tension detector in a short period of time when the athlete first steps on the treadmill, and calculate various tensions or tensions suitable for the athlete according to the detection result. The pressure threshold, so that the threshold is used to judge the athlete's acceleration and/or deceleration intention in subsequent automatic speed adjustment operations. Alternatively, the automatic speed regulating device of the present invention can also provide athletes with different threshold options. For example, at least three threshold options may be provided: a leading option, a normal option, and a lagging option, the leading option being suitable for athletes who prefer to run on the running belt—that is, athletes who prefer to move their legs faster than the running speed of the running belt, and the normal option Suitable for athletes with no special preference, the lag option is suitable for athletes who like to be dragged by the running belt to run—that is, athletes who like to move their legs slower than the running speed of the running belt.

In a preferred embodiment of the electric treadmill above, the parameter setter is integrated in the motor speed controller. This integration can be either physical, i.e. the parameter setter is arranged together with the motor speed controller in a single housing and thus forms one component, or functional, i.e. the parameter setter acts as a motor speed controller It exists as a functional module.

Description of drawings

By understanding the preferred embodiments of the present invention in conjunction with the accompanying drawings, the above-mentioned and other features and advantages of the present invention will become clearer. In the accompanying drawings:

Fig. 1 is a schematic side view of an electric treadmill according to the utility model;

Fig. 2 is the functional block diagram of the automatic speed regulating device of electric treadmill according to the utility model;

Fig. 3 is a schematic diagram of the first embodiment of the automatic speed regulating device of the electric treadmill according to the present invention;

Fig. 4 is a schematic diagram of the second embodiment of the automatic speed regulating device of the electric treadmill according to the present invention.

Detailed ways

The following detailed description of the preferred embodiments of the present invention with reference to the accompanying drawings is merely exemplary in nature and is not intended to limit the present invention, its application or uses. It should be noted that although the preferred embodiment discloses various specific parameters and details of the present utility model, those skilled in the art can easily understand that the protection scope of the present utility model is not limited to these parameters and details, without departing from the present invention In the case of basic principles of the utility model, those skilled in the art can make modifications or equivalent replacements to these parameters and details, and the modified or replaced implementations will also fall within the protection scope of the utility model.

Referring first to FIG. 1 , this figure shows a schematic side view of an electric treadmill 1 according to the present invention. As shown in FIG. 1 , an electric treadmill 1 includes a main frame 11 , a motor 12 , a driving roller 13 , a driven roller 14 , a running board 15 and a running belt 16 . The main frame 11 includes uprights 111 and horizontal supports 112 . Usually, the column 111 is in an inclined state, and an operation panel is arranged on the top thereof, and various buttons and windows are arranged on the operation panel. The motor 12 , the driving roller 13 and the driven roller 14 are all arranged on the horizontal support 112 of the main frame 11 . The motor 12 is connected with the driving roller 13 through a belt drive or the like and provides power for it. As an example, the motor 12 may be a variable frequency motor so that its rotational speed can be adjusted as desired. The driven roller 14 is provided at the other end (the right side in FIG. 1 ) of the horizontal frame 112 so as to face the driving roller 13 . The running board 15 extends between the driving roller 13 and the driven roller 14 and is interposed between two side rails of the horizontal frame 112 (the side rails are not shown in FIG. 1 ). The running belt 16 is wound around the driving roller 13 and the driven roller 14 and laid on the running board 15 . During the operation, the athlete 2 stands on the running belt 16 and the running board 15 and moves his legs as the running belt 16 operates.

Those skilled in the art can easily understand that, in an ideal state, if the speed at which the athlete 2 swings his legs matches the running speed of the running belt 16, when the athlete runs or walks on the treadmill 1, the foothold The tension of the running belt 16 before and after P should be approximately equal. Therefore, if the tension of the running belt before the foothold P is greater than that after the foothold P, it indicates that the speed at which the athlete 2 moves his legs is greater than the running speed of the running belt 16, thereby indicating that the athlete 2 intends to accelerate. Conversely, if the tension of the running belt before the foothold P is smaller than the tension of the running belt after the foothold P, it indicates that the speed at which the athlete 2 moves his legs is lower than the running speed of the running belt 16, thereby indicating that the athlete intends to slow down. Based on this thinking, the inventor of the present application has designed the treadmill automatic speed regulating device according to the utility model.

Referring to Fig. 2 below, this figure shows the functional block diagram of the automatic speed regulating device of the electric treadmill according to the present invention. As shown in FIG. 2 , the automatic speed regulating device includes a running belt tension detector 102 and a motor speed controller 101 . The running belt tension detector 102 is used to detect the running belt tension in front and behind the foothold P of the athlete 2 in real time. The motor speed controller 101 communicates with the running belt tension detector 102 and the motor 12 , and is used to control the speed of the motor 12 according to the output signal of the running belt tension detector 102 . Specifically, when the running belt tension detector 102 detects that the difference between the tension of the running belt in front of the foothold P of the athlete 2 and the tension of the running belt behind the foothold P of the athlete 2 reaches a certain threshold, the motor speed The controller 101 commands the motor 12 to accelerate or decelerate. More specifically, on the one hand, when the running belt tension detector 102 detects that the running belt tension in front of the foothold P of the athlete 2 is greater than the running belt tension behind the foothold P and the difference between the two reaches a certain threshold, The motor speed controller 101 just commands the motor 12 to accelerate; When the difference between the two reaches a certain threshold, the motor speed controller 101 commands the motor 12 to decelerate.

In a preferred embodiment, the calculation of the tension difference before and after the foothold P and the comparison between the difference and the relevant threshold are all performed in the motor speed controller 101, and the running belt tension detector 102 is only responsible for detecting and collecting tension before and after the foothold P. The tension of the running belt is 16. In addition, the automatic speed regulation operation of the present utility model also relates to the motor 12 and the running belt 16, so in a broad sense, the automatic speed regulating device of the present utility model should also include the running belt 16 and the motor 12, but, because the motor 12 and the running belt The running belt 16 itself is a part of the electric treadmill 1 , so the automatic speed regulating device of the present invention is described as only including the running belt tension detector 102 and the motor speed controller 101 in this application. Finally, it should be pointed out that the motor speed controller 101 can be any type of controller, such as a combination logic controller, a microprogram controller, etc., as long as it can receive the signal sent by the running belt tension detector 102 and perform tension difference Calculations and comparisons with relevant thresholds and the ability to signal the motor 12 to change speed are sufficient.

Referring to Fig. 3 below, this figure shows a schematic diagram of the first embodiment of the automatic speed regulating device of the electric treadmill according to the present invention. Various other components have been omitted from FIG. 3 for clarity. In this first embodiment, the running belt tension detector 102 includes a plurality of running belt tension sensors S1, S2. The running belt tension sensors S1 and S2 are arranged on the running board 15 below the running belt 16 for detecting the tension of various parts of the running belt 16 .

As shown in FIG. 3 , S1 represents the tension sensors in front of the foothold P of the athlete 2 , and these sensors are used to detect the tension of the running belt 16 in front of the foothold P. S2 represents the tension sensors behind the foothold P of the athlete 2, and these sensors are used to detect the tension of the running belt 16 behind the foothold P. In this regard, it should be pointed out that although four front sensors S1 and six rear sensors S2 are shown in FIG. 3 , those skilled in the art will readily understand that this number is merely exemplary. The total number of sensors can vary according to specific applications, and the numbers of S1 and S2 will vary with the position of the foothold P of the athlete 2 . For example, if athlete 2's foothold P is relatively forward, the number of S1 may become 3, and the number of S2 may become 7, and vice versa. In addition, the running belt tension sensors S1 and S2 are preferably non-contact tension sensors, and these sensors can be densely arranged on the running board 15 so as to cover various positions of the running belt 16, so that no matter the foothold P of the athlete 2 is running At any position on the belt 16, the sensor can accurately detect the tension of the running belt before and after the foothold P of the athlete 2 .

Finally, referring to FIG. 4 , this figure shows a schematic diagram of the second embodiment of the automatic speed regulating device of the electric treadmill according to the present invention. A number of other components have been omitted from FIG. 4 for clarity. In this second embodiment, the electric treadmill 1 also includes two pairs of bearings 122, and the main frame 11 also includes two pairs of bearing seats 121 arranged on the horizontal support 112, and the driving roller 13 and the driven roller 14 respectively pass through The two pairs of bearings 122 and the bearing housing 121 are connected to the main frame 11 (specifically connected to the horizontal support 112). And, the running belt tension detector 102 includes a plurality of pressure sensors P1, P2, the pressure sensor is arranged between the bearing 122 and the bearing seat 121 and is located on the side close to the center of the running board 15, so as to detect the passing of the running belt 16 The driving roller 13 and the driven roller 14 exert pressure on the bearing housing 121 . Specifically, when the pressure detected by the pressure sensor P1 between the bearing 122 of the driving roller 13 and the bearing seat 121 is greater than the pressure detected by the pressure sensor P2 between the bearing 122 of the driven roller 14 and the bearing seat 121 and the pressure between the two When the difference between them is greater than a certain threshold, the motor speed controller 101 commands the motor 12 to accelerate. Conversely, when the pressure detected by the pressure sensor P1 between the bearing 122 of the driving roller 13 and the bearing seat 121 is less than the pressure detected by the pressure sensor P2 between the bearing 122 of the driven roller 14 and the bearing seat 121 and the pressure between the two When the difference between is greater than a certain threshold, the motor speed controller 101 commands the motor 12 to decelerate.

In a preferred embodiment, the automatic speed regulating device of the present invention includes four pressure sensors, that is, two sensors P1 and two sensors P2. Two sensors P1 are arranged between the bearing 122 of the driving roller 13 and the bearing seat 121 , and the other two sensors P2 are arranged between the bearing 122 of the driven roller 14 and the bearing seat 121 .

In a more preferred embodiment, the automatic speed regulating device of the present invention further includes a parameter setter (not shown). The parameter setter is used to read the detection result of the running belt tension detector 102 when the athlete 2 first steps on the treadmill 1 and set the tension threshold or pressure threshold dedicated to the athlete 2 according to the detection result. In addition, the parameter setter can be integrated with the motor speed controller 101 as one component.

As we all know, there will be individual differences among different athletes, and the tension difference of the running belt before and after the foothold point P may be different. Therefore, for each athlete, the thresholds in the above technical solutions may also be different. For example, for some athletes, they usually like to be dragged by the running belt 16 to run or walk. Under normal circumstances, the running belt tension before the foothold P is obviously smaller than that after the foothold P. And speed up the pace, the running belt tension before the foothold P may be slightly smaller than the running belt tension behind the foothold P. Considering this situation, it is necessary to set different tension or pressure thresholds for different athletes. The above parameter setting device of the present utility model can read the detection result of the running belt tension detector 102 within a short period of time when the athlete first steps on the treadmill 1, and calculate the parameters suitable for the athlete 2 according to the detection result. A tension or pressure threshold, so that the threshold is used in the subsequent automatic speed adjustment operation to judge the acceleration and/or deceleration intention of the athlete 2.

Alternatively, the automatic speed regulating device of the present invention can also provide different threshold options for the athlete 2 . For example, at least three threshold options may be provided: a lead option, a normal option, and a lag option. The lead option is for those who like to run on the belt—that is, those who like to move their legs faster than the running speed of the belt, the normal option is for those who have no special preferences, and the lag option is for those who like to be dragged by the belt Athletes who run on their feet—that is, those who like to move their legs faster than the running speed of the running belt.

Although the technical solution of the utility model has been described with reference to the preferred embodiments, those skilled in the art will easily understand that the scope of protection of the utility model is not limited to these specific implementations, without departing from the basic principles of the utility model. In some cases, the implementation and the specific technical features therein can be split, combined or changed, and the split, combined or changed technical solutions will still fall within the protection scope of the present utility model.

Claims (7)

1. An electric treadmill, this electric treadmill comprises a main frame, a motor, a driving roller, a driven roller, a running board and a running belt, the main frame comprises a column and a horizontal support, and the motor and the driving roller are arranged on the main frame At one end of the horizontal support, the motor is connected to the driving roller and provides power for it. The driven roller and the driving roller are oppositely arranged at the other end of the horizontal support. The running board extends between the driving roller and the driven roller and is interposed between the horizontal support. Between the two side rails, the running belt is wrapped around the driving roller and the driven roller and laid on the running board, It is characterized in that it also includes: A running belt tension detector, which is used for real-time detection of the running belt tension in front of and behind the athlete's foothold; and a motor speed controller, which communicates with the running belt tension detector and the motor, and is used to control the speed of the motor according to the output signal of the running belt tension detector, Wherein, when the running belt tension detector detects that the difference between the running belt tension in front of the athlete's foothold and the running belt tension behind the athlete's foothold reaches a certain threshold, the motor speed controller will Commands the motor to accelerate or decelerate. 2. The electric treadmill according to claim 1, wherein when the running belt tension detector detects that the running belt tension in front of the athlete's foothold is greater than the running belt tension behind the foothold and between the two When the difference between reaches a certain threshold, the motor speed controller commands the motor to accelerate, and Wherein, when the running belt tension detector detects that the running belt tension in front of the athlete's foothold is smaller than the running belt tension behind the foothold and the difference between the two reaches a certain threshold, the motor speed controller will The motor is commanded to slow down. 3. The electric treadmill according to claim 1, wherein the running belt tension detector comprises a plurality of running belt tension sensors, and the running belt tension sensors are arranged on the running board below the running belt for Check the tension of each part of the running belt. 4. The electric treadmill according to claim 1, characterized in that, the electric treadmill also includes two pairs of bearings, the main frame also includes two pairs of bearing blocks arranged on the horizontal support, the driving roller and the The driven rollers are respectively connected to the main frame through the two pairs of bearings and bearing housings, Wherein, the running belt tension detector includes a plurality of pressure sensors, the pressure sensors are arranged between the bearing and the bearing seat and are located on a side close to the center of the running board, and Wherein, when the pressure detected by the pressure sensor between the bearing of the driving roller and the bearing seat is greater than the pressure detected by the pressure sensor between the bearing of the driven roller and the bearing seat and the difference between the two is greater than When a certain threshold is reached, the motor speed controller commands the motor to accelerate; and when the pressure detected by the pressure sensor between the bearing of the driving roller and the bearing seat is less than that between the bearing of the driven roller and the bearing seat When the pressure detected by the pressure sensor and the difference between the two is greater than a certain threshold, the motor speed controller commands the motor to decelerate. 5. The electric treadmill according to claim 4, wherein the running belt tension detector comprises four pressure sensors, two of which are arranged between the bearing and the bearing seat of the driving roller, and the other two It is arranged between the bearing of the driven roller and the bearing seat. 6. The electric treadmill according to claim 1, further comprising a parameter setter, which is used to read the detection result of the running belt tension detector when the athlete initially steps on the treadmill And according to the detection result, a tension threshold or a pressure threshold dedicated to the athlete is set. 7. The electric treadmill according to claim 6, characterized in that the parameter setter is integrated in the motor speed controller.