A belt tension adjusting device and adjusting method

Abstract

A belt tension adjusting device and an adjusting method, comprising a tension pulley, a tension pulling block and a tension seat. The belt is wound around the circumferential surface of the tension pulley, and the tension pulley is correspondingly rotatably connected to one end of the tension pulling block. The tension seat is hollow inside, and one end is open and the other end is closed. The end of the tension pulling block facing away from the tension pulley is correspondingly slidably matched with the cavity at the open end of the tension seat. One end of the tension pulling block located in the cavity of the tension seat is provided with a stud that movably penetrates the closed end of the tension seat. A nut is threadedly connected to the column body of the stud protruding from the closed end of the tension seat. The closed end of the tension seat is provided with an adjusting assembly for driving the nut to rotate. The adjusting assembly comprises a rotating seat coaxially connected to the nut at one end, and the stud movably penetrates the rotating seat. The adjusting assembly of the present invention is provided with a torque indicating mechanism for indicating the torque overcome by clockwise rotation. The belt tension is indicated by the torque indicating mechanism, which is convenient for the consistency of belt tension adjustment.

Description

Technical Field

[0001] The present invention relates to the technical field of synchronous belt tension adjustment, and in particular to a belt tension adjustment device and an adjustment method. Background Art

[0002] It is well-known that in the 3D printer industry, most belt tensioning mechanisms adjust the belt tension by manually screwing nuts and tensioning blocks to change the distance between two belt pulleys; however, it is difficult to achieve consistency in the belt tension adjusted by manually screwing the nuts by hand feeling, which seriously affects the consistency of the shipment of 3D printers. It is also difficult to adjust the belt tension to the factory setting during later maintenance, thus affecting the printing quality. This problem has troubled technicians in this field for many years and urgently needs to be solved. Summary of the Invention

[0003] In order to overcome the deficiencies in the background art, the present invention discloses a belt tension adjustment device and an adjustment method.

[0004] To achieve the above invention purposes, the present invention adopts the following technical solutions:

[0005] A belt tension adjustment device and an adjustment method, comprising a tension pulley, a tension block and a tension seat. The belt is wound around the circumferential surface of the tension pulley, and the tension pulley is rotatably connected to one end of the tension block correspondingly; the inside of the tension seat is hollow, and one end is open and the other end is closed. The end of the tension block facing away from the tension pulley is slidably matched with the cavity at the open end of the tension seat. One end of the tension block located in the cavity of the tension seat is provided with a stud that penetrates through the closed end of the tension seat movably; a nut is threadedly connected to the column body of the stud extending out of the closed end of the tension seat.

[0006] The closed end of the tension seat is provided with an adjustment assembly for driving the nut to rotate; the adjustment assembly includes a rotating seat coaxially connected to the nut at one end, and the stud penetrates through the rotating seat movably; at the end of the rotating seat facing away from the nut, a swing rod for driving the rotating seat to rotate is rotatably connected, and the middle of the swing rod is rotatably connected to the center of the rotating seat correspondingly; on one side of the rotating seat corresponding to the swing rod, a torque indicating mechanism for indicating the torque overcome by the swing rod to drive the rotating seat to tighten the nut is provided; the torque indicating mechanism includes an arc-shaped positioning groove provided on the rotating seat, the center of the arc of the arc-shaped positioning groove coincides with the center of the rotating seat, a spring II with one end correspondingly abutted against the swing rod is placed in the arc-shaped positioning groove, and a transparent end cover is installed at the end of the rotating seat facing away from the nut through a bolt; a limiting structure is provided on the side of the rotating seat corresponding to the swing rod facing away from the torque indicating mechanism.

[0007] Preferably, the limiting structure is a sector-shaped groove; sector-shaped grooves with the sharp corners facing the center of the rotating seat are provided on both the upper and lower parts of the rotating seat, and the swing rod is located in the sector-shaped groove.

[0008] Preferably, the rotating seat is provided with a torque indicating mechanism at the positions corresponding to the two sector-shaped grooves.

[0009] Preferably, the torque indicating mechanism further includes an arc-shaped elastic piece fixedly connected to the swing rod at one end, and the center of the arc-shaped elastic piece coincides with the center of the rotating seat; an arc-shaped guiding groove is provided at a position corresponding to the free end of the arc-shaped elastic piece on the rotating seat, and an arc-shaped partition for separating the arc-shaped guiding groove into two notches is provided along the arc length direction at the center position of the arc-shaped guiding groove. A sliding column capable of freely sliding along the two notches is provided at the free end of the arc-shaped elastic piece, and there is a gap between both ends of the arc-shaped partition and both ends of the arc-shaped guiding groove that allows the sliding column to pass freely. The arc-shaped partition intersects with the movement track of the free end of the arc-shaped elastic piece. One end of the arc-shaped partition close to the swing rod is located outside the movement track of the free end of the arc-shaped elastic piece, and one end of the arc-shaped partition far from the swing rod is located inside the movement track of the free end of the arc-shaped elastic piece.

[0010] Preferably, a bell for making a sound by hitting is provided at the end of the outer notch of the arc-shaped guiding groove facing away from the swing rod.

[0011] Preferably, a positioning column is provided on the rod body of the swing rod corresponding to the position of the spring II.

[0012] Preferably, a silica gel damping sheet capable of frictionally contacting the sliding column is provided on the outside of the rotating seat corresponding to the arc-shaped guiding groove.

[0013] Preferably, pressing plates are provided at both ends of the swing rod.

[0014] Preferably, a tensioning assembly is provided between the tensioning seat and the adjusting assembly; the tensioning assembly includes a rotating sleeve movably sleeved outside the nut. One end of the rotating sleeve corresponding to the tensioning seat is rotatably connected to the tensioning seat, and this end of the rotating sleeve is closed. The stud movably penetrates through the closed end of the rotating sleeve; a spring I is sleeved on the rod body of the stud between the closed end of the rotating sleeve and the nut; strip-shaped sliding grooves are opened along the length direction on both sides inside the body of the rotating sleeve, and the nut is provided with two convex studs respectively slidingly matched with the two strip-shaped sliding grooves.

[0015] Preferably, the swing rod is used to rotate the rotating seat in the direction of tightening the nut until the sliding column moves to the end of the arc-shaped guiding groove far from the swing rod; at this time, the free end of the arc-shaped elastic piece expands outward along the gap between the arc-shaped partition and this end of the arc-shaped guiding groove, and the sliding column collides with the groove wall of the outer notch of the arc-shaped guiding groove, making a prompting sound, indicating that the adjustment is in place; stop screwing; the swing rod resets under the action of the spring II.

[0016] Due to adopting the technical scheme as described above, the present invention has the following beneficial effects:

[0017] A belt tension adjusting device and an adjusting method disclosed by the present invention have a simple structure and are convenient to use; the adjusting assembly is provided with a torque indicating mechanism for indicating the torque overcome by clockwise rotation, and the belt tension is indicated through the torque indicating mechanism, which is convenient for the consistency of belt tension adjustment;

[0018] In addition, the torque indicating mechanism further includes an arc-shaped elastic piece fixedly connected to the swing rod at one end. An arc-shaped guiding groove is provided at the position corresponding to the free end of the arc-shaped elastic piece on the rotating seat. An arc-shaped partition plate that divides the arc-shaped guiding groove into two notches is provided along the arc length direction at the center position of the arc-shaped guiding groove. A sliding column that can freely slide along the two notches is provided at the free end of the arc-shaped elastic piece. When the sliding column collides with the outer notch wall of the arc-shaped guiding groove, a prompting sound can be emitted to prompt the operator that the belt tightness adjustment is in place. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of the present invention;

[0020] Figure 2 is an exploded structural diagram of the adjusting assembly;

[0021] Figure 3 is a schematic structural diagram of the rotating seat;

[0022] Figure 4 is a schematic structural diagram of the tensioning assembly.

[0023] In the figure: 1, belt; 2, tensioning pulley; 3, tensioning pull block; 4, tensioning seat; 5, stud; 6, tensioning assembly; 6-1, rotating sleeve; 6-2, convex column; 6-3, spring I; 6-4, strip-shaped sliding groove; 7, adjusting assembly; 7-1, rotating seat; 7-2, swing rod; 7-3, arc-shaped elastic piece; 7-4, arc-shaped guiding groove; 7-5, arc-shaped partition plate; 7-6, sliding column; 7-7, arc-shaped positioning groove; 7-8, spring II; 7-9, bolt; 7-10, transparent end cap; 7-11, positioning column; 7-12, silica gel damping sheet; 7-13, pressure plate; 8, nut; 9, bell. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The present invention can be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention. In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right", etc. indicating the orientation or positional relationship, they are only corresponding to the drawings of the present application for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation.

[0025] Combined with the attached Figures 1 to 4, a belt tension adjustment device and adjustment method, comprising a tensioning wheel 2, a tensioning block 3 and a tensioning seat 4, the circular surface of the tensioning wheel 2 is wrapped with a belt 1, the other end of the belt 1 is wrapped with the pulley of the driving motor, the tensioning wheel 2 is rotatably connected to one end of the tensioning block 3; the tensioning seat 4 is hollow inside, and one end is open and the other end is closed, the end of the tensioning block 3 away from the tensioning wheel 2 is correspondingly slidably matched with the cavity of the open end of the tensioning seat 4, and the end of the tensioning block 3 located in the cavity of the tensioning seat 4 is provided with a stud 5 that is movable and passes through the closed end of the tensioning seat 4; the column body of the stud 5 extending out of the closed end of the tensioning seat 4 is threadedly connected with a nut 8, that is, the stud 5 can be tightened by the nut 8, the stud 5 pulls the tensioning block 3 to slide along the tensioning seat 4, and then tightens the belt 1, thereby achieving the purpose of tensioning the belt 1;

[0026] The closed end of the tensioning seat 4 is provided with an adjusting component 7 for driving the nut 8 to rotate. According to needs, when the adjusting component 7 rotates clockwise, it drives the tensioning component 6 to rotate clockwise to tighten the belt 1. When the adjusting component 7 rotates counterclockwise, it drives the tensioning component 6 to rotate counterclockwise to loosen the belt 1. The adjusting component 7 includes a rotating seat 7-1 with one end coaxially connected to the nut 8, and the stud 5 movably penetrates the rotating seat 7-1; the end of the rotating seat 7-1 away from the nut 8 is rotatably connected to a swing rod 7-2 for driving the rotating seat 7-1 to rotate, and the middle part of the swing rod 7-2 is rotatably connected to the center of the rotating seat 7-1; a torque indicating mechanism is provided on the side of the rotating seat 7-1 corresponding to the swing rod 7-2 for indicating the torque overcome by the swing rod 7-2 to drive the rotating seat 7-1 to tighten the nut 8;

[0027] The torque indicating mechanism comprises an arc-shaped positioning groove 7-7 provided on the rotating seat 7-1, the arc center of the arc-shaped positioning groove 7-7 coincides with the center of the rotating seat 7-1, a spring II 7-8 having one end in contact with the rod body of the swing rod 7-2 is clamped in the arc-shaped positioning groove 7-7, and a transparent end cover 7-10 is installed on the end of the rotating seat 7-1 away from the nut 8 through a bolt 7-9; that is, when the swing rod 7-2 rotates clockwise, the torque is transmitted to the rotating seat 7-1 through the torque indicating mechanism, and the torque when the rotating seat 7-1 is screwed is indicated while the belt 1 is tightened. The torque when the rotating seat 7-1 is screwed increases gradually as the belt 1 is gradually tightened, thereby indirectly indicating the tension of the belt 1, which is convenient for the consistency of the tension adjustment of the belt 1; as needed, a positioning column 7-11 is provided at the position of the rod body of the swing rod 7-2 corresponding to the spring II 7-8, and the positioning column 7-11 can limit the spring II 7-8 to prevent the spring II 7-8 from accidentally flying out during assembly;

[0028] A limiting structure is provided on the side of the rotating seat 7-1 corresponding to the swing rod 7-2 away from the torque indicating mechanism; as required, the limiting structure is a sector-shaped groove; sector-shaped grooves with the sharp corners facing the center of the rotating seat 7-1 are provided on both the upper and lower parts of the rotating seat 7-1, the rod body of the swing rod 7-2 is located in the sector-shaped groove, and torque indicating mechanisms for indicating the torque overcome by the clockwise rotation of the swing rod 7-2 are provided on the right side of the upper-sector-shaped groove of the rotating seat 7-1 and the left side of the lower-sector-shaped groove of the rotating seat 7-1, that is, when the swing rod 7-2 rotates counterclockwise, the rod body of the swing rod 7-2 abuts against the corresponding groove wall of the sector-shaped groove, driving the rotating seat 7-1 to rotate counterclockwise, and the belt 1 can be relaxed.

[0029] The torque indicating mechanism further includes an arc-shaped positioning groove 7-7 provided on the rotating seat 7-1, the center of the arc of the arc-shaped positioning groove 7-7 coincides with the center of the rotating seat 7-1, a spring II 7-8 with one end correspondingly abutting against the rod body of the swing rod 7-2 is clamped in the arc-shaped positioning groove 7-7, and a transparent end cover 7-10 is installed at one end of the rotating seat 7-1 away from the tensioning assembly 6 through a bolt 7-9, that is, when the swing rod 7-2 is screwed clockwise, the swing rod 7-2 compresses the spring II 7-8, and the screwing torque is transmitted to the rotating seat 7-1 through the spring II 7-8, and the screwing torque of the swing rod 7-2 is judged by observing the compression amount of the spring II 7-8.

[0030] The torque indicating mechanism further includes an arc-shaped elastic piece 7-3 fixedly connected to the swing rod 7-2 at one end, and the center of the arc of the arc-shaped elastic piece 7-3 coincides with the center of the rotating seat 7-1; an arc-shaped guide groove 7-4 is provided at the position of the rotating seat 7-1 corresponding to the free end of the arc-shaped elastic piece 7-3, an arc-shaped partition 7-5 for dividing the arc-shaped guide groove 7-4 into two slots is provided along the arc length direction at the center position of the arc-shaped guide groove 7-4, a sliding column 7-6 capable of freely sliding along the two slots is provided at the free end of the arc-shaped elastic piece 7-3, and there are intervals between both ends of the arc-shaped partition 7-5 and both ends of the arc-shaped guide groove 7-4 that can allow the sliding column 7-6 to pass freely. The arc-shaped partition 7-5 intersects with the movement track of the free end of the arc-shaped elastic piece 7-3. One end of the arc-shaped partition 7-5 close to the swing rod 7-2 is located outside the movement track of the free end of the arc-shaped elastic piece 7-3, and one end of the arc-shaped partition 7-5 far from the swing rod 7-2 is located inside the movement track of the free end of the arc-shaped elastic piece 7-3.

[0031] That is, when initially screwing the swing rod 7-2 clockwise, the free end of the arc-shaped elastic piece 7-3 is located at the inner notch of the arc-shaped guide groove 7-4 near one end of the swing rod 7-2. When screwing the swing rod 7-2 clockwise, the sliding column 7-6 slides along the inner notch of the arc-shaped guide groove 7-4. When the sliding column 7-6 moves to the end of the arc-shaped guide groove 7-4 away from the swing rod 7-2, the free end of the arc-shaped elastic piece 7-3 expands outward along the gap between the arc-shaped partition plate 7-5 and this end of the arc-shaped guide groove 7-4, and the sliding column 7-6 collides with the groove wall of the outer notch of the arc-shaped guide groove 7-4, emitting a prompt sound, indicating that the amount of compression of the spring II 7-8 by the swing rod 7-2 at this time has reached the level of adjusting the tension of the belt 1 to an appropriate degree. As needed, a bell 9 that makes a sound by being struck is provided at the end of the outer notch of the arc-shaped guide groove 7-4 facing away from the swing rod 7-2. That is, when the free end of the arc-shaped elastic piece 7-3 expands outward along the gap between the arc-shaped partition plate 7-5 and this end of the arc-shaped guide groove 7-4, it can drive the sliding column 7-6 to strike the bell 9, and the bell 9 emits a prompt sound to remind the operator that the adjustment is in place;

[0032] When screwing the swing rod 7-2 counterclockwise, the sliding column 7-6 slides along the outer notch of the arc-shaped guide groove 7-4. When the sliding column 7-6 moves to the end of the arc-shaped guide groove 7-4 near the swing rod 7-2, the free end of the arc-shaped elastic piece 7-3 contracts inward along the gap between the arc-shaped partition plate 7-5 and this end of the arc-shaped guide groove 7-4 and returns to the initial state;

[0033] A tensioning assembly 6 is provided between the tensioning seat 4 and the adjusting assembly 7; the tensioning assembly 6 includes a rotating sleeve 6-1 that is movably sleeved outside the nut 8. One end of the rotating sleeve 6-1 corresponding to the tensioning seat 4 is rotatably connected to the tensioning seat 4, and this end of the rotating sleeve 6-1 is closed. The stud 5 movably penetrates through the closed end of the rotating sleeve 6-1. A spring I 6-3 is sleeved on the rod body of the stud 5 between the closed end of the rotating sleeve 6-1 and the nut 8. Bar-shaped sliding grooves 6-4 are respectively opened on both sides of the inner side of the body of the rotating sleeve 6-1 along the length direction. The nut 8 is provided with two convex columns 6-2 that respectively slide and cooperate with the two bar-shaped sliding grooves 6-4. That is, by screwing the rotating sleeve 6-1, the rotating sleeve 6-1 drives the nut 8 to rotate, and the nut 8 pulls the stud 5. At the same time, the spring I 6-3 provides a supporting force for the nut 8. That is, the elastic force of the spring I 6-3 and the tension of the belt 1 reach a force balance, leaving an expansion allowance for the belt 1 while tensioning the belt 1 to prevent the belt 1 from being too tight and breaking. During the later use process, the spring I 6-3 can compensate for the elongation of the belt 1 in real time, so that the belt 1 always maintains an appropriate tension; when adjusting, the rotating sleeve 6-1 can block the spring I 6-3 to avoid accidental pinching of the operator;

[0034] In addition, a silica gel damping sheet 7-12 capable of frictionally contacting the sliding column 7-6 is provided on the outer side of the rotating base 7-1 corresponding to the arc-shaped guide groove 7-4. That is, when the sliding column 7-6 slides along the outer groove opening of the arc-shaped guide groove 7-4, a frictional force will be generated between the sliding column 7-6 and the silica gel damping sheet 7-12, avoiding the rapid counterclockwise rebound of the swing rod 7-2 and the violent collision with the corresponding groove wall of the fan-shaped groove of the rotating base 7-1. Pressing plates 7-13 are provided at both ends of the swing rod 7-2, facilitating the operator to twist the swing rod 7-2 and improving the operator's operating feel.

[0035] When implementing the belt tension adjusting device and adjusting method of the present invention, during use, the tensioning base 4 is fixedly connected to the 3D printer frame correspondingly. The rotating base 7-1 is driven by the swing rod 7-2 to rotate to twist the nut 8. The stud 5 is tightened by the nut 8, and the stud 5 pulls the tensioning block 3 to slide along the tensioning base 4, thereby tightening the belt 1 to achieve the purpose of tensioning the belt 1. When twisting the swing rod 7-2, the torque is transmitted to the rotating base 7-1 through the torque indicating mechanism, indicating the torque when twisting the rotating base 7-1 while tightening the belt 1. The torque for twisting the rotating base 7-1 gradually increases as the belt 1 is gradually tightened, thereby indirectly indicating the tension of the belt 1 and facilitating the consistency of the adjustment of the belt 1 tension.

[0036] The parts not detailed in the present invention are prior arts. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive, aiming to include all changes falling within the meaning and scope of the equivalent elements in the present invention.

Claims

1. A belt tensioning force adjustment device, comprising a tensioning wheel (2), a tensioning block (3) and a tensioning seat (4), wherein a belt (1) is wound around the round surface of the tensioning wheel (2), and the tensioning wheel (2) is rotatably connected to one end of the tensioning block (3); the tensioning seat (4) is hollow inside, and one end is open and the other end is closed, and the end of the tensioning block (3) facing away from the tensioning wheel (2) is slidably matched with the open end cavity of the tensioning seat (4), and the end of the tensioning block (3) located in the cavity of the tensioning seat (4) is provided with a stud (5) that movably penetrates the closed end of the tensioning seat (4); the characteristics are: The stud (5) extends out of the closed end of the tensioning seat (4) and is threadedly connected with a nut (8); The closed end of the tensioning seat (4) is provided with an adjustment assembly (7) for driving the nut (8) to rotate; the adjustment assembly (7) comprises a rotating seat (7-1) having one end coaxially connected to the nut (8), and the stud (5) movably penetrates the rotating seat (7-1); the end of the rotating seat (7-1) facing away from the nut (8) is rotatably connected to a swing rod (7-2) for driving the rotating seat (7-1) to rotate, and the middle part of the swing rod (7-2) is rotatably connected to the center of the rotating seat (7-1); the rotating seat (7-1) is provided with a side of the swing rod (7-2) corresponding to the swing rod (7-2) for indicating that the swing rod (7-2) drives the rotating seat (7-1) 1) a torque indicating mechanism for overcoming torque by tightening a nut (8); the torque indicating mechanism comprising an arc-shaped positioning groove (7-7) provided on a rotating seat (7-1), the arc center of the arc-shaped positioning groove (7-7) coincident with the center of the rotating seat (7-1), a spring II (7-8) having one end correspondingly abutting against a rod body of a swing rod (7-2) is clamped in the arc-shaped positioning groove (7-7), and a transparent end cover (7-10) is installed on one end of the rotating seat (7-1) away from the nut (8) via a bolt (7-9); a limiting structure is provided on the side of the rotating seat (7-1) corresponding to the swing rod (7-2) away from the torque indicating mechanism; The torque indicating mechanism further comprises an arc-shaped spring piece (7-3) whose one end is correspondingly and fixedly connected to the swing rod (7-2); the center of the arc-shaped spring piece (7-3) coincides with the center of the rotating seat (7-1); an arc-shaped guide groove (7-4) is provided at a position corresponding to the free end of the arc-shaped spring piece (7-3) at the rotating seat (7-1); an arc-shaped partition plate (7-5) is provided at the center of the arc-shaped guide groove (7-4) along the arc length direction to separate the arc-shaped guide groove (7-4) into two notches; and a free end of the arc-shaped spring piece (7-3) is provided with a spring element capable of moving freely along the two notches. A sliding column (7-6) is provided, and there are gaps between the two ends of the arc-shaped partition (7-5) and the two ends of the arc-shaped guide groove (7-4) so ​​that the sliding column (7-6) can pass freely. The arc-shaped partition (7-5) intersects with the movement trajectory of the free end of the arc-shaped spring sheet (7-3). The end of the arc-shaped partition (7-5) close to the swing rod (7-2) is located outside the movement trajectory of the free end of the arc-shaped spring sheet (7-3), and the end of the arc-shaped partition (7-5) away from the swing rod (7-2) is located inside the movement trajectory of the free end of the arc-shaped spring sheet (7-3); A tensioning assembly (6) is provided between the tensioning seat (4) and the adjusting assembly (7); the tensioning assembly (6) includes a rotating sleeve (6-1) movably sleeved outside the nut (8). One end of the rotating sleeve (6-1) corresponding to the tensioning seat (4) is rotatably connected to the tensioning seat (4), and this end of the rotating sleeve (6-1) is closed. The stud (5) movably penetrates through the closed end of the rotating sleeve (6-1). A spring I (6-3) is sleeved on the rod body of the stud (5) between the closed end of the rotating sleeve (6-1) and the nut (8). On both sides of the inner side of the body of the rotating sleeve (6-1), strip-shaped sliding grooves (6-4) are provided along the length direction. The nut (8) is provided with two convex columns (6-2) respectively corresponding to and slidingly cooperating with the two strip-shaped sliding grooves (6-4).

2. The belt tension adjusting device according to claim 1, characterized in that: The limiting structure is a sector-shaped groove; sector-shaped grooves with the sharp angles facing the center of the rotating seat (7-1) are provided on both the upper and lower parts of the rotating seat (7-1). The rod body of the swing rod (7-2) is located in the sector-shaped groove.

3. The belt tension adjusting device according to claim 2, characterized in that: The rotating seat (7-1) is provided with a torque indicating mechanism at positions corresponding to the two sector-shaped grooves.

4. The belt tension adjusting device according to claim 1, wherein: A bell (9) that makes a sound by hitting is provided at one end of the outer slot opening of the arc-shaped guiding groove (7-4) away from the swing rod (7-2).

5. The belt tension adjusting device according to claim 1, characterized in that: A positioning column (7-11) is provided on the rod body of the swing rod (7-2) at a position corresponding to the spring II (7-8).

6. The belt tension adjusting device according to claim 1, characterized in that: A silica gel damping sheet (7-12) that can be in frictional contact with the sliding column (7-6) is provided on the outside of the rotating seat (7-1) corresponding to the arc-shaped guiding groove (7-4).

7. The belt tension adjusting device according to claim 1, characterized in that: Pressure plates (7-13) are provided at both ends of the swing rod (7-2).

8. The adjusting method of the belt tension adjusting device according to claim 1, characterized in that: The rotating seat (7-1) is rotated in the direction of tightening the nut (8) through the swing rod (7-2) until the sliding column (7-6) moves to one end of the arc-shaped guiding groove (7-4) away from the swing rod (7-2); at this time, the free end of the arc-shaped elastic piece (7-3) expands outward along the gap between the arc-shaped partition plate (7-5) and this end of the arc-shaped guiding groove (7-4), and the sliding column (7-6) collides with the groove wall of the outer slot opening of the arc-shaped guiding groove (7-4), making a prompt sound, indicating that the adjustment is in place; stop screwing; the swing rod (7-2) resets under the action of the spring II (7-8).

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