CN108211219A - Treadmill - Google Patents

Abstract

The invention relates to a treadmill. The treadmill includes a base, a drive shaft, a driven shaft and an endless running belt. The driving shaft and the driven shaft are arranged on the base at a distance from each other, the endless running belt is sleeved on the driving shaft and the driven shaft, and an armrest frame is also arranged on the base, The armrest frame includes a first folding tube, a second folding tube, and a third folding tube that are sequentially connected by rotation, and a through hole is provided in the armrest frame, and the through hole passes through the first folding tube, the second folding tube, and the second folding tube. The folding cylinder and the third folding cylinder are provided with an alignment column in the through hole, and the alignment column includes two steel bars that are rotatably connected to each other. The treadmill is convenient to fold.

Description

Treadmill

technical field

The present invention relates to a treadmill.

Background technique

With the awakening of national health awareness, more and more people have joined the running movement to enhance their physical fitness through running. And for the convenience of running at home, a large number of various types of treadmills have appeared on the market. A treadmill generally includes a base, an armrest frame, two driving shafts and an endless running belt. The belt is sheathed on the two drive shafts. When running is required, the two drive shafts drive the endless running belt to rotate, and the user holds the armrest frame and stands on the endless running belt to run. However, the armrest frame of this treadmill is vertical relative to the base, so that the treadmill has a large volume and cannot be folded.

Contents of the invention

Based on this, it is necessary to provide a treadmill that is easy to fold.

A treadmill, comprising a base, a driving shaft, a driven shaft and an endless running belt, the driving shaft and the driven shaft are arranged on the base at intervals, and the endless running belt is sleeved on the driving On the shaft and the driven shaft, an armrest frame is also arranged on the base, and the armrest frame includes a first folding cylinder, a second folding cylinder and a third folding cylinder which are sequentially rotatably connected, and the armrest frame is provided with A through hole, the through hole passes through the first folding cylinder, the second folding cylinder and the third folding cylinder, and an alignment column is arranged in the through hole, and the alignment column includes mutually rotatably connected Two steel bars, one of which is threaded through the connection between the first folding tube and the second folding tube, and the other steel bar is threaded between the second folding tube and the At the junction of the third folding cylinder, pulling the alignment column can make the junction of the two steel bars align with the junction of the second folding cylinder and the third folding cylinder, so that the armrest The first folding cylinder, the second folding cylinder and the third folding cylinder of the stand can be folded relative to each other.

In one of the embodiments, the base is provided with a rack, and the bottom of the armrest frame is provided with a gear, and the gear of the armrest frame meshes with the rack so that the armrest frame is rotatably connected to the on the base.

In one embodiment, a connecting rope is connected to the end of the straightening column, and the end of the connecting rope is connected to the rack. Pulling the straightening column drives the rack to move, and can drive the rack. The armrest frame rotates relative to the base, thereby adjusting the angle of the armrest frame.

In one embodiment, a through hole is opened on the side wall of the first folding cylinder, and the connecting rope is passed through the through hole and extends to the base.

In one of the embodiments, a sliding groove is opened in the base, and a connecting hole is opened on the side wall of the sliding groove, the rack is slidably arranged in the sliding groove, and the connecting rope is passed through the in the connecting hole.

In one embodiment, a fixed pulley is further arranged in the base, and the connecting rope is wound around the fixed pulley and connected to the end of the rack.

In one of the embodiments, the gear is a cylindrical gear, and a rotating shaft protrudes from the middle of the gear, and the rotating shaft is rotatably mounted on the base, and the gear part is exposed outside the edge of the base .

In one of the embodiments, the two steel bars are respectively a first steel bar and a second steel bar, and the first steel bar is passed through the first folding cylinder and the second folding cylinder, the The second steel bar is passed through the second folding barrel and the third folding barrel.

In one embodiment, the length of the first steel bar is equal to the length of the second folding cylinder, and the length of the second steel bar is greater than the length of the third folding cylinder.

In one embodiment, both the first steel bar and the second steel bar are cylindrical steel bars, and the diameters of the first steel bar and the second steel bar are both the same as the diameter of the through hole of the same inner diameter.

When the treadmill is in use, the armrest frame is unfolded so that the first folding cylinder, the second folding cylinder and the third folding cylinder are in a straight line. Then, insert the straightening column into the through hole of the armrest frame, that is, make one of the steel bars pass through the connection between the first folding cylinder and the second folding cylinder, and the other one is The steel bar is passed through the connection between the second folding cylinder and the third folding cylinder, so as to prevent the second folding cylinder from folding relative to the first folding cylinder, and also prevent the third folding cylinder from folding It is folded relative to the second folding cylinder, and then the armrest frame is fixed in an extended state, which is convenient for the user to hold. When the treadmill needs to be transported, the joint of the two steel bars is aligned with the joint of the second folding cylinder and the third folding cylinder by pulling the straightening column, so that the The first folding cylinder, the second folding cylinder and the third folding cylinder of the armrest frame can all be folded relative to each other, thereby realizing the folding of the armrest frame, which facilitates the folding and transportation of the treadmill.

Description of drawings

Fig. 1 is a three-dimensional schematic diagram of a treadmill according to an embodiment.

Fig. 2 is a three-dimensional schematic view of another viewing angle of the treadmill shown in Fig. 1 .

Fig. 3 is a plan view of an embodiment of an armrest frame, connecting ropes and racks.

FIG. 4 is a three-dimensional schematic diagram of a rack and a unidirectional structure according to an embodiment.

FIG. 5 is a module block diagram of a rack control method according to an embodiment.

FIG. 6 is a three-dimensional schematic diagram of a partial structure of the alignment column and the armrest frame of an embodiment.

Fig. 7 is a partial enlarged view of the place B in Fig. 6 .

Detailed ways

In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the associated drawings. Preferred embodiments of the invention are shown in the accompanying drawings. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

It should be noted that when an element is referred to as being “fixed” to another element, it can be directly on the other element or there can also be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and similar expressions are used herein for purposes of illustration only and are not intended to represent the only embodiments.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terms used herein are for the purpose of describing specific embodiments only, and are not intended to limit the present invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The present invention relates to a treadmill. The treadmill includes a base, a driving shaft, a driven shaft and an endless running belt, the driving shaft and the driven shaft are arranged on the base at intervals, and the endless running belt is sleeved on the driving shaft with the driven shaft. For example, an armrest frame is also provided on the base, and the armrest frame includes a first folding cylinder, a second folding cylinder, and a third folding cylinder that are sequentially connected in rotation, and a through hole is arranged in the armrest frame, and the through hole An alignment column is disposed in the through hole passing through the first folding cylinder, the second folding cylinder and the third folding cylinder. For example, the alignment column includes two steel bars that are rotatably connected to each other, one of the steel bars passes through the connection between the first folding cylinder and the second folding cylinder, and the other of the steel bars It passes through the connection between the second folding cylinder and the third folding cylinder. For example, pulling the straightening column can make the connection of the two steel bars align with the connection of the second folding cylinder and the third folding cylinder, so that the first folding cylinder of the armrest frame The folding cylinder, the second folding cylinder and the third folding cylinder can all be folded relative to each other.

Referring to Fig. 1 and Fig. 2, a treadmill 100 includes a base 10, a drive shaft 20, a driven shaft 30 and an endless running belt 40, and the drive shaft 20 and the driven shaft 30 are spaced apart from each other on the On the base 10, the endless running belt 40 is sleeved on the driving shaft 20 and the driven shaft 30, and the base 10 is also provided with an armrest frame 50, and the armrest frame 50 includes sequentially rotating and connected The first folding cylinder 51, the second folding cylinder 52 and the third folding cylinder 53, the armrest frame 50 is provided with a through hole 501, the through hole 501 passes through the first folding cylinder 51, the second folding cylinder 52 and the third folding cylinder 53 and the through hole 501 are provided with an alignment column 60, the alignment column 60 includes two steel bars that are rotatably connected to each other, one of the steel bars is passed through the The connection between the first folding cylinder 51 and the second folding cylinder 52, wherein another steel bar is passed through the connection between the second folding cylinder 52 and the third folding cylinder 53, pulling the The alignment column 60 can align the connection of the two steel bars with the connection of the second folding cylinder 52 and the third folding cylinder 53, so that the first folding cylinder of the armrest frame 50 51. Both the second folding cylinder 52 and the third folding cylinder 53 can be folded relative to each other.

For example, the assembly process of the treadmill 100 is specifically as follows: the drive shaft 20 and the driven shaft 30 are arranged on the base 10 at intervals, and the endless running belt 40 is sleeved on the drive shaft. shaft 20 and the driven shaft 30 , wherein the height of the driving shaft 20 from the base 10 is greater than the height of the driven shaft 30 from the base 10 . Finally, the armrest frame 50 is installed on one side of the base 10 and adjacent to the driving shaft 20 .

When the treadmill 100 is in use, the armrest frame 50 is unfolded so that the first folding cylinder 51 , the second folding cylinder 52 and the third folding cylinder 53 are in a straight line. Then, the alignment column 60 is inserted into the through hole 501 of the armrest frame 50, so that one of the steel bars passes through the connection between the first folding cylinder 51 and the second folding cylinder 52 , wherein the other steel bar is passed through the connection between the second folding tube 52 and the third folding tube 53, so that the two steel bars prevent the second folding tube 52 from moving relative to the The first folding tube 51 is folded, and at the same time, the third folding tube 53 is prevented from being folded relative to the second folding tube 52 , thereby fixing the armrest frame 50 in an extended state, which is convenient for users to hold. When the treadmill 100 needs to be transported, the steel bar at the bottom is completely separated from the first folding cylinder 51 by pulling the alignment column 60, and the joint of the two steel bars is aligned with the second folding cylinder 51. The connection between the cylinder 52 and the third folding cylinder 53, so that the first folding cylinder 51, the second folding cylinder 52 and the third folding cylinder 53 of the armrest frame 50 can be folded relatively, Furthermore, the folding of the armrest frame 50 is realized, which facilitates the folding and transportation of the treadmill 100 .

Referring to Fig. 3 and Fig. 4, for example, in order to facilitate the adjustment of the inclination angle of the armrest frame 50, the base 10 is provided with a rack 70, and the bottom of the armrest frame 50 is provided with a gear 54, that is, the first The bottom of the folding cylinder 51 is provided with the gear 54 , and the gear 54 of the armrest frame 50 meshes with the rack 70 so that the armrest frame 50 is rotatably connected to the base 10 . The end of the straightening column 60 is connected with a connecting rope 61, the end of the connecting rope 61 is connected to the rack 70, pulling the straightening column 60 drives the rack 70 to move, and can drive the handrail The frame 50 rotates relative to the base 10 to further adjust the angle of the armrest frame 50 . By twitching the alignment column 60, under the condition that the alignment column 60 can prevent the folding of the armrest frame 50, the inclination angle of the armrest frame 50 relative to the base 10 is adjusted, that is, pulling the alignment The column 60 drives the rack 70 to move through the connecting rope 61 , so that the armrest frame 50 engaged with the rack 70 rotates, thereby realizing the adjustment of the inclination angle of the armrest frame 50 . At this time, one of the steel bars is still passed through the connection between the first folding cylinder 51 and the second folding cylinder 52, and the other steel strip is still passed through the second folding cylinder 51 and the second folding cylinder 52. The joint between the barrel 52 and the third folding barrel 53 . For example, the armrest frame 50 can be positioned by the friction between the rack 70 and the base 10 . For example, the gear 54 is formed at the bottom of the first folding cylinder 51 away from the second folding cylinder 52 .

For example, in order to avoid the self-rotation of the armrest frame 50 caused by accidentally applying force on the armrest frame 50, the base 10 is also provided with a one-way structure 80, and the one-way structure 80 cooperates with the rack 70 , can allow the rack 70 to move into the base 10 and prevent the rack 70 from moving out of the base 10 . For example, an engaging tooth groove 71 is formed on the top surface of the rack 70 for engaging with the gear 54 . The side wall of the rack 70 is provided with a plurality of positioning slots 73, the positioning slots 73 are arranged in sequence, the one-way structure 80 includes a locking column 81 and an elastic wire 82, and the locking column One end of 81 is rotatably arranged on the base 10, the other end of the locking post 81 is inserted and held against one of the positioning tooth grooves 73, and the elastic wire 82 is installed in the base 10 and held against Hold in the locking column 81, so that the locking column 81 is obliquely inserted into the positioning tooth groove 73, and the extending direction of the locking column 81 and the movement of the rack 70 into the base The directions A of 10 form an acute angle, that is, the extending direction of the locking post 81 is substantially the same as the direction A in which the rack 70 moves into the base 10 , so that the rack 70 can be prevented from retreating. When the connecting rope 61 pulls the rack 70 to move into the base 10 , the locking post 81 can be inserted into an adjacent positioning tooth slot 73 . And when the armrest frame 50 drives the rack 70 to move to the outside of the base 10 through the gear 54, the rack 70 is resisted by the locking column 81 and cannot move outward, thereby realizing The one-way movement of the rack 70 can only move in the direction A, so as to avoid the angle change of the armrest frame 50 due to accidental force. When the rack 70 needs to be pulled out, press the locking column 81 to rotate so that the locking column 81 breaks away from the positioning tooth groove 73 of the rack 70, and at this time, it can be pulled out to the outside of the base 10. Out of the rack 70 , for example, the locking column 81 can be pressed and rotated upwards to disengage from the positioning tooth groove 73 , for example, the elastic wire 82 presses against the locking column 81 downward. When the treadmill 100 needs to be folded, the armrest frame 50 can be folded by pulling the straightening column 60, at this time, the rack 70 is also pulled into the base 10 and hidden In the base 10, it is convenient to reduce the volume of the treadmill 100, so that it is easy to carry. When the armrest frame 50 needs to be unfolded, the rack 70 is pulled so that the connecting rope 61 drives the alignment column 60 into the through hole 501 .

Please refer to FIG. 2 and FIG. 3 again. For example, in order to facilitate the installation of the connecting rope 61, a piercing hole 511 is provided on the side wall of the first folding cylinder 51, and the connecting rope 61 is threaded through the piercing hole 511. hole 511 and extend to the base 10 . The base 10 is provided with a sliding groove 11, and the side wall of the sliding groove 11 is provided with a connecting hole 13, the rack 70 is slidably arranged in the sliding groove 11, and the connecting rope 61 is passed through the In the connecting hole 13. The one-way structure 80 is disposed on the sidewall of the sliding groove 11 . By opening the piercing hole 511 on the first folding cylinder 51, it is convenient to accommodate most of the connecting rope 61 in the armrest frame 50, and only the end of the connecting rope 61 passes through the The holes 511 pass through, which facilitates the folding of the connecting rope 61 and avoids accidental winding of the connecting rope 61 caused by exposure to the outside.

For example, in order to facilitate pulling the connecting rope 61, a fixed pulley 15 is also arranged in the base 10, and the connecting rope 61 is wound around the fixed pulley 15 and connected to the end of the rack 70, The end of the connecting rope 61 away from the rack 70 is connected to the end of one of the steel bars. The gear 54 is a cylindrical gear, and the middle part of the gear 54 is protruded with a rotating shaft 541, and the rotating shaft 541 is rotatably mounted on the base 10, and the gear 54 is partially exposed outside the edge of the base 10 . For example, the two steel bars are respectively the first steel bar 63 and the second steel bar 65, and the first steel bar 63 is passed through the first folding tube 51 and the second folding tube 52, so The second steel bar 65 passes through the second folding cylinder 52 and the third folding cylinder 53 . The connecting rope 61 is connected to the end of the first steel bar 63 away from the second steel bar 65 . The top of the fixed pulley 15 is flush with the surface of the rack 70. Since the connecting rope 61 is wound on the fixed pulley 15, the connecting rope 61 is prevented from being worn by the side wall of the base 10, which facilitates The movement of the connecting rope 61 can control the moving direction of the connecting rope 61 more accurately.

For example, in order to facilitate the folding of the armrest frame 50, the length of the first steel bar 63 is equal to the length of the second folding tube 52, that is, when the alignment column 60 is pulled upward, the first steel bar 63 can just be completely hidden in the second folding cylinder 52, so that the first steel bar 63 avoids the connection between the first folding cylinder 51 and the second folding cylinder 52, and makes the first steel bar 63 The connection between a steel bar 63 and the second steel bar 65 is aligned with the connection between the second folding cylinder 52 and the third folding cylinder 53 . For example, the length of the second steel bar 65 is greater than the length of the third folding tube 53 . For example, in another embodiment, both the first steel bar 63 and the second steel bar 65 are cylindrical steel bars, and the diameter of the first steel bar 63 is the same as the diameter of the second steel bar 65 Both are equal to the inner diameter of the through hole 501 . By setting the length of the second steel bar 65 to be longer than the length of the third folding tube 53 , the second steel bar 65 can be exposed to the outside of the armrest frame 50 , thereby facilitating pulling and pressing by the user.

Please refer to Fig. 5, in addition, in order to realize the automatic control of the movement of the rack 70, in one implementation, the base 10 is provided with a moving motor 75, the connecting rope 61 is an elastic rope, the rack 70 and the The connecting ropes 61 are all connected to the moving motor 75 , and the rack 70 is provided with a tension sensor 76 . When the connecting rope 61 pulls the moving motor 75, the moving motor 75 senses that the pulling force on the rack 70 exceeds a preset threshold through the tension sensor 76, thereby driving the rack 70 moves into the base 10 . For example, an actuator 811 is provided at the end of the locking column 81, and the actuator 811 is telescopically supported on the locking column 81, and a controller 77 is provided in the base 10, and the moving The motor 75 , the tension sensor 76 and the actuator 811 are all electrically connected to the controller 77 . When the tension sensor 76 senses that the tension of the rack 70 exceeds a preset threshold, the controller 77 controls the moving motor 75 to drive the rack 70 into the base 10 accordingly. move, thereby driving the armrest frame 50 to adjust the inclination angle of the armrest frame 50 . When the controller 77 senses that the tension on the rack 70 is less than the preset threshold, the controller 77 controls the actuator 811 to press the locking post 81 so that the locking post 81 Break away from the positioning tooth groove 73, and control the moving motor 75 to drive the rack 70 to move outward.

Please refer to FIG. 6 and FIG. 7 , for example, in order to facilitate the support of the user, handlebars (not shown) protrude from opposite sides of the second folding cylinder 52 . Both opposite sides of the third folding cylinder 53 are protrudingly provided with armrest columns (not shown in the figure). People with different heights can adaptively hold the handrail handle or the handrail column. In order to facilitate the adjustment of the height of the armrest frame 50 so that the treadmill 100 can be used by people of different heights, the first steel bar 63 is detachably connected to the second steel bar 65, and the alignment The column 60 also includes a replacement steel bar 66 that is rotationally and detachably connected to the first steel bar 63 , and a flexible rotating portion 661 is provided in the middle of the replacement steel bar 66 . The flexible turning portion 661 enables opposite ends of the replacement steel bar 66 to be folded relative to each other. When it is necessary to be suitable for people with a shorter height, the second steel bar 65 is disassembled from the first steel bar 63, the replacement steel bar 66 is connected to the first steel bar 63, and Insert the alignment column 60 into the through hole 501 of the armrest frame 50 . When the first steel bar 63 is aligned with the connection between the first folding cylinder 51 and the second folding cylinder 52, the flexible rotating part 661 of the replacement steel bar 66 is aligned with the second folding cylinder 52 and the second folding cylinder 52. The connection of the third folding cylinder 53, so that the second folding cylinder 52 cannot rotate relative to the first folding cylinder 51, and the third folding cylinder 53 can be turned over relative to the second folding cylinder 52 and It is positioned against the second folding cylinder 52 . For example, the second folding cylinder 52 is provided with two positioning fins (not shown in the figure), and the roots of the two handrail columns are respectively clamped on the two positioning fins. At this time, the position of the armrest column on the third folding cylinder 53 is lower than the armrest handle on the second folding cylinder 52 . The user can support the armrest handle on the second folding tube 52 for exercise, and for a shorter person, he can also hold the armrest column on the third folding tube 53, thereby expanding the application of the treadmill 100. crowd range.

For example, in order to facilitate the connection of the first folding cylinder 51, the second folding cylinder 52 and the third folding cylinder 53, the opposite sides of the top of the first folding cylinder 51 protrude outward respectively with pivoting Column 512, the two sides of the bottom of the second folding tube 52 are respectively protruded with pivoting tubes 521, and the two pivoting columns 512 are inserted in the two pivoting tubes 521 so as to make the The second folding cylinder 52 is rotatably connected to the first folding cylinder 51 . Similar to this, the opposite sides of the top of the second folding tube 52 are provided with pivot posts 512 protruding outward respectively, and the bottom sides of the third folding tube 53 are respectively provided with pivot posts 521 . The two pivot columns 512 of the second folding cylinder 52 are respectively inserted into the two pivot cylinders 521 of the third folding cylinder 53 , so that the third folding cylinder 53 relative to the second folding cylinder 52 is realized. Turn to connect.

For example, in order to improve the support strength of the armrest frame 50, the cross section of the through hole 501 is rectangular, the cross section of the first steel bar 63 and the cross section of the second steel bar 65 are both rectangular, The length direction of the rectangular cross-section of the first steel bar 63 is perpendicular to the rotation axis of the second folding tube 52 , that is, the thicker direction of the first steel bar 63 is parallel to the direction of the second folding tube 52 . The connecting line of the two pivoting columns 512 is vertical, so that the first steel bar 63 can prevent the rotation of the second folding cylinder 52 by its own structural strength. For example, in another embodiment, a flexible pivoting ball (not shown) is provided at the connection between the first steel bar 63 and the second steel bar 65, that is, the first steel bar 63 and the second steel bar 65 The second steel bar 65 is rotatably connected by the flexible pivoting ball, so that when the flexible pivoting ball is aligned with the joint between the second folding cylinder 52 and the third folding cylinder 53, the third folding The cylinder 53 can be relatively easily rotated relative to the second folding cylinder 52 . For example, in order to facilitate aligning the flexible pivoting ball at the junction of the second folding cylinder 52 and the third folding cylinder 53, a marking line (not shown in the figure) is provided on the top of the second steel bar 65 As shown), when the marking line is aligned with the top of the armrest frame 50, the flexible pivoting ball can be aligned with the junction of the second folding cylinder 52 and the third folding cylinder 53.

The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, should be considered as within the scope of this specification.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is relatively specific and detailed, but should not be construed as limiting the patent scope of the present invention. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims (10)

1. a treadmill, is characterized in that, comprises base, driving shaft, driven shaft and endless running belt, and described driving shaft and described driven shaft are arranged on the described base at intervals mutually, and described endless running belt Sleeved on the drive shaft and the driven shaft, an armrest frame is also provided on the base, and the armrest frame includes a first folding cylinder, a second folding cylinder and a third folding cylinder that are sequentially connected in rotation. A through hole is provided in the armrest frame, and the through hole passes through the first folding cylinder, the second folding cylinder and the third folding cylinder, and an alignment column is arranged in the through hole, and the alignment column The column includes two steel bars that are rotatably connected to each other, one of the steel bars is passed through the connection between the first folding cylinder and the second folding cylinder, and the other steel strip is passed through the second folding cylinder. The connection between the second folding cylinder and the third folding cylinder, pulling the alignment column can make the connection of the two steel bars align with the connection between the second folding cylinder and the third folding cylinder , so that the first folding cylinder, the second folding cylinder and the third folding cylinder of the armrest frame can be folded relative to each other. 2. The treadmill according to claim 1, wherein the base is provided with a rack, the bottom of the armrest frame is provided with a gear, and the gear of the armrest frame is engaged with the rack, so as to The armrest frame is rotatably connected to the base. 3. The treadmill according to claim 2, wherein a connecting rope is connected to the end of the straightening column, and the end of the connecting rope is connected to the rack, and pulling the straightening column drives the The movement of the rack can drive the armrest frame to rotate relative to the base, thereby adjusting the angle of the armrest frame. 4. The treadmill according to claim 3, wherein a perforating hole is opened on the side wall of the first folding cylinder, and the connecting rope is passed through the perforating hole and extends to the on the base. 5. The treadmill according to claim 4, wherein a slide groove is opened in the base, a connecting hole is opened on the side wall of the slide groove, and the rack is slidably arranged in the slide groove Inside, the connecting rope is passed through the connecting hole. 6 . The treadmill according to claim 5 , wherein a fixed pulley is further arranged in the base, and the connecting rope is wound around the fixed pulley and connected to the end of the rack. 7. The treadmill according to claim 6, wherein the gear is a cylindrical gear, and the middle part of the gear is convexly provided with a rotating shaft, and the rotating shaft is rotatably mounted on the base, and the gear A part is exposed outside the edge of the base. 8. The treadmill according to claim 7, wherein the two steel bars are respectively a first steel bar and a second steel bar, and the first steel bar passes through the first folding cylinder and the second steel bar. In the second folding cylinder, the second steel bar is passed through the second folding cylinder and the third folding cylinder. 9. The treadmill according to claim 8, wherein the length of the first steel bar is equal to the length of the second folding cylinder, and the length of the second steel bar is longer than that of the third folding cylinder length. 10. The treadmill according to claim 9, wherein the first steel bar and the second steel bar are cylindrical steel bars, and the diameter of the first steel bar is the same as that of the second steel bar. The diameter of the bars is equal to the inner diameter of the through hole.