Belt tensioning device

Abstract

The utility model discloses a belt tensioning device which comprises a fixing seat, a rotating arm is rotatably installed on the fixing seat, and a tensioning roller is rotatably installed at the end, away from the fixing seat, of the rotating arm. The first rotating part is rotationally installed on the fixing base, the second rotating part is rotationally installed in the middle of the rotating arm, the screw penetrates through a first through hole of the first rotating part and a second through hole of the second rotating part, an abutting table is arranged in the middle of the screw, and the abutting table is provided with an abutting face; the second rotating piece is provided with a placement groove, and the abutting table is located in the placement groove. The abutting platform is arranged on the screw rod, the abutting surface is arranged on the abutting platform, and rotation of the screw rod is limited through interaction of the abutting surface and the groove wall of the placement groove of the second rotating part, so that the screw rod which cannot rotate can effectively avoid nut looseness and even failure caused by rotation of the screw rod during implementation, and the screw rod is prevented from being damaged. And the positions of the rotating arm and the tensioning roller on the rotating arm can be effectively ensured to be fixed, so that the belt is continuously tensioned, and the tensioning effect is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of belt transmission, in particular to a belt tensioning device. Background Art

[0002] Belt drive is a commonly used transmission method. A belt is placed on two pulleys, and the rotation of one pulley can drive the other pulley to rotate to achieve transmission.

[0003] Belt drives require a certain degree of belt tension to achieve a certain amount of friction between the belt and the pulley, enabling the belt to be driven or the pulley to rotate. After a period of use, the belt may become loose, affecting transmission efficiency. Therefore, a belt tensioning device can be configured to tighten the loosened belt to maintain a certain degree of belt tension. Existing belt tensioning devices use a screw as an adjustment rod. The adjustment rod passes through rotating members located on a fixed seat and a rotating arm, respectively, and is then tightened with a nut to fix the position of the rotating arm relative to the fixed seat. The tensioning roller on the rotating arm is now fixed in position, and the tensioning degree is adjusted by contacting the tensioning roller with the belt and adjusting its position. However, during use, the overall vibration of the belt drive and the belt tensioning device can cause the screw to rotate, loosening the nut or even failing, resulting in an insecure fixation of the screw and nut to the rotating arm and poor tensioning. Utility Model Content

[0004] In view of the above shortcomings, the present invention provides a belt tensioning device, which can solve the problem that the screw and nut of the existing belt tensioning device are easy to loosen and cause poor tensioning effect.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A belt tensioning device, comprising:

[0007] Fixed seat;

[0008] a rotating arm, one end of which is rotatably mounted on the fixed seat;

[0009] a tensioning roller rotatably mounted on an end of the rotating arm away from the fixed seat;

[0010] a first rotating member, rotatably mounted on the fixed seat, wherein the first rotating member is provided with a first through hole;

[0011] a second rotating member, which is rotatably mounted at a middle position of the rotating arm, and the second rotating member is provided with a second through hole;

[0012] a screw rod passing through the first through hole of the first rotating member and the second through hole of the second rotating member;

[0013] A coaxially arranged abutment platform is fixedly provided at the middle portion of the screw rod, an end surface of the abutment platform is larger than the second through hole of the second rotating member so that the abutment platform cannot pass through the second through hole of the second rotating member, and at least one side surface of the abutment platform is provided with a flat abutment surface;

[0014] The second rotating member is provided with a seating groove on a side surface facing the fixed seat. After the screw rod passes through the second through hole of the second rotating member, the abutment platform is located in the seating groove and the abutment surface abuts against the groove wall of the seating groove so that the screw rod cannot rotate around its axis.

[0015] A plurality of nuts are matched and screwed into the screw rod, and at least the nuts are located on both sides of the first rotating member and on a side of the second rotating member away from the placement groove.

[0016] Furthermore, the first rotating member and the second rotating member are planar at sides facing the nut.

[0017] Furthermore, the abutment platform is provided with planar abutment surfaces at two opposite side surfaces, and the distance between the two abutment surfaces is equal to the slot width of the placement slot.

[0018] Furthermore, mounting plates are provided on both sides of the end of the rotating arm away from the fixed seat, and mounting grooves running through both sides are opened at the end of the mounting plate away from the rotating arm, and both ends of the roller shaft of the tensioning roller are installed in the mounting grooves on both sides;

[0019] A U-shaped clip is provided on the side surfaces of the mounting plates on both sides respectively. The U-shaped clip is clamped on both ends of the roller shaft of the tensioning roller and the middle part of the U-shaped clip corresponds to the notch position of the mounting groove on both sides. The side surfaces of the U-shaped clip are in contact with the side surfaces of the mounting plates on both sides, and the U-shaped clip is mounted on the mounting plates by screws.

[0020] Furthermore, the first rotating member is mounted on the fixed seat via a mounting base;

[0021] The second rotating member is mounted on the rotating arm via a mounting base;

[0022] The mounting base includes a first mounting base unit fixedly mounted on the fixed base or the rotating arm and a second mounting base unit detachably mounted on the first mounting base unit, wherein limiting grooves are respectively provided on both sides of the first mounting base unit and the second mounting base unit, and when the second mounting base unit is mounted on the first mounting base unit, the limiting grooves of the two can form a cylindrical cavity;

[0023] Both ends of the first rotating member and the second rotating member are respectively provided with cylindrical end heads, and the cylindrical end heads at both ends of the first rotating member and the second rotating member are respectively located in the cylindrical cavities formed by the limiting grooves on both sides.

[0024] Furthermore, both sides of the first mounting base unit and the second mounting base unit respectively include an L-shaped plate and a diagonal support plate connecting the wing plates at both ends of the L-shaped plate, and the limiting grooves are opened at the corners of the L-shaped plate.

[0025] Furthermore, a spacer is provided on the screw rod, and the spacer is located between the nut and the first rotating member or the second rotating member.

[0026] Furthermore, a pin is provided at the end of the rotating arm connected to the fixing seat, and the pin passes through the fixing seat to realize the rotating connection between the rotating arm and the fixing seat;

[0027] The fixing seat is provided with a shaft sleeve, the shaft sleeve is sleeved on the outside of the pin shaft, and the shaft sleeve is provided with a first oil filling hole.

[0028] Furthermore, the pin shaft is fixedly provided with a radially extending locking end at the end passing through the fixed seat, and the side of the rotating arm is fixedly provided with a locking portion, and the locking portion is provided with a locking groove that is consistent in size with the end of the locking end, and the locking end is located in the locking groove.

[0029] Furthermore, the roller shaft of the tensioning roller is provided with a second oil filling hole connected with the interior of the roller wheel of the tensioning roller.

[0030] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention provides an abutment platform on the screw, and an abutment surface on the abutment platform, and through the interaction between the abutment surface and the groove wall of the mounting groove of the second rotating member, the screw is restricted from rotating around its axis. Therefore, when implemented, the screw that cannot rotate can effectively avoid the loosening or even failure of the nut caused by the rotation of the screw, and can effectively ensure that the position of the rotating arm and the tensioning roller thereon is fixed, so as to achieve continuous tightening of the belt and ensure the tightening effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for describing the embodiments.

[0032] Figure 1 This is a structural diagram of the belt tensioning device of the utility model from one perspective;

[0033] Figure 2 This is a structural diagram of the belt tensioner of the present invention from another perspective;

[0034] Figure 3This is a structural diagram of the belt tensioning device of the utility model from another perspective;

[0035] Figure 4 This is a schematic diagram of the main view of the belt tensioning device of the present invention;

[0036] Figure 5 This is a schematic structural diagram of the screw rod of the present invention;

[0037] Figure 6 This is a structural diagram of the fixing base and the first mounting base unit thereon of the present invention;

[0038] Figure 7 This is a structural diagram of the second mounting base unit of the present invention;

[0039] Figure 8 This is a schematic structural diagram of the tensioning roller of the present utility model.

[0040] Among them, the marks shown in the figure are: 10-fixed seat; 11-sleeve; 12-first oil filling hole; 13-adapter seat; 20-rotating arm; 21-mounting groove; 22-mounting plate; 23-U-shaped clamp; 24-pin shaft; 25-locking end; 26-locking part; 27-card cover; 30-tensioning roller; 31-roller shaft; 32-spherical roller bearing; 33-second oil filling hole; 34-roller; 40-first rotating member; 50-second rotating member; 51-receiving groove; 60-screw; 61-abutment platform; 62-nut; 63-abutment surface; 70-mounting base; 71-first mounting base unit; 72-second mounting base unit; 73-limiting groove; 74-L-shaped plate; 75-bracing plate; 80-spacer. DETAILED DESCRIPTION

[0041] The following will be combined with the accompanying drawings of the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0042] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0043] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0044] Please refer to Figures 1 to 8 A preferred embodiment of the present invention provides a belt tensioning device, which mainly includes a fixing seat 10, a rotating arm 20, a tensioning roller 30, a first rotating member 40, a second rotating member 50, a screw 60 and a nut 62.

[0045] The fixing seat 10 serves as the supporting structure of the entire belt tensioning device and is fixedly installed on the outside when in use. The fixing seat 10 is provided with screw holes, which can be installed on the outside with bolts through the screw holes to achieve a detachable installation. The fixing seat 10 can be provided with screw holes at the bottom to achieve installation through the bottom, or screw holes can be provided on the side to achieve installation through the side. For example, in this exemplary embodiment, the bottom of the fixing seat 10 is also provided with an adapter seat 13 by means of bolt connection, and the side of the adapter seat 13 is provided with screw holes, which can be used to achieve installation through the side through the screw holes on the side. The screw holes of the fixing seat 10 and the adapter seat 13 are preferably long strip holes, which can adjust the installation position and increase the production tolerance.

[0046] One end of the rotating arm 20 is rotatably mounted on the fixed base 10. In this preferred embodiment, the rotating arm 20 has a certain curvature. A tensioning roller 30 is rotatably mounted on the end of the rotating arm 20 away from the fixed base 10. The tensioning roller 30 is used to abut the belt and apply a certain pressure to the belt to achieve belt tension.

[0047] Mounting plates 22 are provided on either side of the end of the rotating arm 20 away from the fixed base 10. This end of the rotating arm 20 away from the fixed base 10 serves as the end for mounting the tensioning roller 30. The tensioning roller 30 is located between the two mounting plates 22. Mounting slots 21 extend through the end of the mounting plate 22 away from the rotating arm 20. The ends of the roller shaft 31 of the tensioning roller 30 are mounted within these mounting slots 21. In this preferred embodiment, the tensioning roller 30 includes a roller shaft 31 and a roller 34 that is rotatable relative to the roller shaft 31. A spherical roller bearing is disposed between the roller 34 and the roller shaft 31. Specifically, the roller 34 of the tensioning roller 30 is mounted on the roller shaft 31 of the tensioning roller 30 via the spherical roller bearings 32, ensuring good coaxiality tolerance at both ends of the roller. The roller shaft 31 of the tensioning roller 30 is provided with a second oil filling hole 33 which is connected to the inside of the roller wheel of the tensioning roller 30. The second oil filling hole 33 is connected to the spherical roller bearing 32. Grease can be injected into the roller wheel of the tensioning roller 30 through the second oil filling hole 33 to improve the lubrication performance of the spherical roller bearing 32 and prevent it from getting stuck.

[0048] The roller shaft 31 is fixedly mounted on the mounting groove 21 and does not rotate. In this exemplary embodiment, the two ends of the roller shaft 31 have opposing flat surfaces that fit neatly into the mounting groove 21. At this point, the roller shaft 31 cannot rotate relative to the mounting groove 21. During operation, the roller 34 contacts the belt and rotates. U-shaped clips 23 are provided on the side surfaces of the mounting plates 22 on both sides. The U-shaped clips 23 are clamped on both ends of the roller shaft 31 of the tensioning roller 30, and the middle portions of the U-shaped clips 23 correspond to the notches of the mounting grooves 21 on both sides. At this point, the notches of the mounting grooves 21, originally used for the roller shaft 31 to enter and exit, are blocked by the middle portions of the U-shaped clips 23. The U-shaped clips 23 press the roller shaft 31 tightly into the mounting groove 21, preventing the roller shaft 31 from exiting the notch of the mounting groove 21. The sides of the U-shaped clip 23 fit into the sides of the mounting plates 22 on both sides. The U-shaped clip 23 is mounted on the mounting plates 22 by screws. Each U-shaped clip 23 is mounted on the mounting plates 22 by four screws. The screw-in direction is perpendicular to the U-shaped clip 23 and the sides of the mounting plates 22. Through this fixing method, the function of the U-shaped clip 23 and the fixing method of the bolts can increase the limiting strength of the tensioning roller 30 and prevent the tensioning roller 30 from jumping out after high-speed operation.

[0049] A first rotating member 40 is rotatably mounted on the fixed base 10 and defines a first through-hole. A second rotating member 50 is rotatably mounted in the middle of the rotating arm 20 and defines a second through-hole. A screw 60 passes through the first through-hole of the first rotating member 40 and the second through-hole of the second rotating member 50. The diameters of the first and second through-holes are equal to or slightly larger than the nominal diameters of the screw 60, allowing the screw 60 to move within the first and second through-holes without excessive movement.

[0050] A coaxially arranged abutment platform 61 is fixedly provided in the middle of the screw 60. The end surface of the abutment platform 61 is larger than the second through hole of the second rotating member 50 so that the abutment platform 61 cannot pass through the second through hole of the second rotating member 50. In this exemplary embodiment, the abutment platform 61 is conical in shape as a whole, and the larger side of the bottom is the bottom surface and is used to abut against the second rotating member 50. At least one side surface of the abutment platform 61 is provided with a flat abutment surface 63. The second rotating member 50 is provided with a seating groove 51 on the side facing the fixed seat 10. After the screw 60 passes through the second through hole of the second rotating member 50, the abutment platform 61 abuts against the second rotating member 50, and the abutment platform 61 is located in the seating groove 51 and the abutment surface 63 abuts against the groove wall of the seating groove 51 so that the screw 60 cannot rotate around its axis. A plurality of nuts 62 are screwed into the screw 60, at least some of the nuts 62 are located on both sides of the first rotating member 40 and are screwed onto the first rotating member 40, and at least some of the nuts 62 are located on the side of the second rotating member 50 away from the mounting groove 51 and are screwed onto the second rotating member 50. At this time, the screw 60 can be fixed to the first rotating member 40 and the second rotating member 50 by tightening each nut 62. At this time, the position of the screw 60 relative to the first rotating member 40 and the second rotating member 50 is fixed, and the rotating arm 20 cannot rotate, that is, the position of the rotating arm 20 and the tensioning roller 30 thereon is fixed, so that continuous tensioning of the belt can be achieved.

[0051] The present invention restricts the screw 60 from rotating around its axis through the interaction between the abutment surface 63 and the groove wall of the placement groove 51. Therefore, when implemented, the screw 60 that cannot rotate can effectively prevent the nut from loosening or even failing due to the rotation of the screw, and can effectively ensure that the position of the rotating arm 20 and the tensioning roller 30 thereon is fixed, so as to achieve continuous tightening of the belt and ensure the tightening effect.

[0052] In a preferred embodiment, the nuts 62 can be grouped in pairs to form a double-nut fixing form. Each group of nuts acts on the side of the first rotating member 40 and the second rotating member 50, which can further prevent the nuts 62 from loosening.

[0053] A spacer sleeve 80 is sleeved on the screw rod 60 , and the spacer sleeve 80 is located between the first rotating member 40 and the nut 62 located at the end of the screw rod 60 away from the rotating arm 20 . By providing the spacer sleeve 80 , the nut 62 can be effectively prevented from loosening.

[0054] The first rotating member 40 and the second rotating member 50 have flat sides for contact with the nut 62 , which can increase contact with the nut 62 and enhance the locking effect.

[0055] The abutment platform 61 is provided with planar abutment surfaces 63 on two opposing sides. The distance between the two abutment surfaces 63 is equal to the width of the seating groove 51. When the abutment platform 61 is inserted into the seating groove 51, the abutment surfaces 63 on both sides abut against the side walls of the seating groove 51, thereby achieving a larger abutment area and ensuring the effect of limiting rotation. The bottom of the seating groove 51 is flat, and the bottom surface of the abutment platform 61 closely abuts against the bottom of the groove to ensure the effect.

[0056] The first rotating member 40 is mounted on the fixed base 10 via a mounting base 70, and the second rotating member 50 is mounted on the rotating arm 20 via a mounting base 70. The mounting base 70 includes a first mounting base unit 71 fixedly mounted on the fixed base 10 or the rotating arm 20 and a second mounting base unit 72 detachably mounted on the first mounting base unit 71. The detachable mounting method is a bolt and nut assembly connection. Limiting grooves 73 are respectively provided on both sides of the first mounting base unit 71 and the second mounting base unit 72. When the second mounting base unit 72 is mounted on the first mounting base unit 71, the limiting grooves 73 of the two can form a cylindrical cavity. The first rotating member 40 and the second rotating member 50 are respectively provided with cylindrical end caps at both ends. The cylindrical end caps at both ends of the first rotating member 40 and the second rotating member 50 are respectively located in the cylindrical cavity formed by the limiting grooves 73 on both sides. The cylindrical cavity structure formed by the limiting grooves 73 of the first mounting base unit 71 and the second mounting base unit 72 can limit the cylindrical ends of the first rotating member 40 and the second rotating member 50, that is, it can retain the rotation function of the first rotating member 40 and the second rotating member 50, and can effectively prevent the first rotating member 40 and the second rotating member 50 from jumping out of the mounting base 70. The first mounting base unit 71 and the second mounting base unit 72 respectively include an L-shaped plate 74 and a diagonal support plate 75 connecting the wing plates at both ends of the L-shaped plate 74 on both sides. The limiting grooves 73 are opened at the corners of the L-shaped plate 74. This structural form can ensure the strength of the first mounting base unit 71 and the second mounting base unit 72, as well as the limiting strength of the first rotating member 40 and the second rotating member 50, thereby preventing the first rotating member 40 and the second rotating member 50 from jumping out of the mounting base 70 and preventing the mounting base 70 from loosening and causing the first rotating member 40 and the second rotating member 50 to jump.

[0057] A pin 24 is provided at the end where the rotating arm 20 connects to the fixed base 10. The pin 24 passes through the fixed base 10 to achieve a rotational connection between the rotating arm 20 and the fixed base 10. A sleeve 11 is provided on the fixed base 10. The sleeve 11 is sleeved on the outside of the pin 24 and has a first oil injection hole 12. The sleeve 11 forms a relatively sealed space with the fixed base 10 and the pin 24. Grease can be injected through the first oil injection hole 12 to improve lubrication performance and prevent sticking.

[0058] The pin 24 is fixedly provided with a radially extending locking end 25 at the end that passes through the fixed seat 10. A locking portion 26 is fixedly provided on the side of the rotating arm 20. The locking portion 26 has a locking groove that is the same size as the end of the locking end 25. When the locking end 25 is located in the locking groove, the pin 24 and the rotating arm 20 cannot rotate relative to each other. Therefore, when the rotating arm 20 rotates, it drives the pin 24 to rotate relative to the fixed seat 10, ensuring the rotation effect. A card cover 27 is provided at the position of the locking portion 26 relative to the locking groove. The card cover 27 is installed on the locking portion 26 by screws and covers the locking groove. At this time, the card cover 27 can effectively limit the locking end 25 from separating from the locking portion 26, thereby limiting the rotation of the pin 24 and the movement of the axis.

[0059] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A belt tensioning device, characterized in that: Includes: Fixed seat (10); A rotating arm (20), one end of which is rotatably mounted on the fixing seat (10); a tensioning roller (30) rotatably mounted on an end of the rotating arm (20) away from the fixed seat (10); a first rotating member (40) rotatably mounted on the fixed seat (10), wherein the first rotating member (40) is provided with a first through hole; a second rotating member (50) rotatably mounted at a middle position of the rotating arm (20), wherein the second rotating member (50) is provided with a second through hole; a screw (60) passing through the first through hole of the first rotating member (40) and the second through hole of the second rotating member (50); A coaxially arranged abutment platform (61) is fixedly provided in the middle of the screw rod (60), an end surface of the abutment platform (61) is larger than the second through hole of the second rotating member (50) so that the abutment platform (61) cannot pass through the second through hole of the second rotating member (50), and at least one side surface of the abutment platform (61) is provided with a flat abutment surface (63); The second rotating member (50) is provided with a seating groove (51) on the side facing the fixed seat (10); after the screw (60) passes through the second through hole of the second rotating member (50), the abutment platform (61) is located in the seating groove (51) and the abutment surface (63) abuts against the groove wall of the seating groove (51) so that the screw (60) cannot rotate around its axis; A plurality of nuts (62) are screwed into the screw rod (60), and at least one of the nuts (62) is located on both sides of the first rotating member (40) and on a side of the second rotating member (50) away from the placement groove (51).

2. The belt tensioner according to claim 1, characterized in that: The first rotating member (40) and the second rotating member (50) are flat on the side surfaces thereof for engaging with the nut (62).

3. The belt tensioner according to claim 1 or 2, characterized in that: The abutment platform (61) is provided with planar abutment surfaces (63) at two opposite side surfaces, respectively. The distance between the two abutment surfaces (63) is equal to the width of the placement groove (51).

4. The belt tensioner according to claim 1, characterized in that: Mounting plates (22) are provided on both sides of the end of the rotating arm (20) away from the fixed seat (10), and mounting grooves (21) running through both sides are opened at the end of the mounting plate (22) away from the rotating arm (20), and both ends of the roller shaft (31) of the tensioning roller (30) are installed in the mounting grooves (21) on both sides; U-shaped clips (23) are respectively provided on the side surfaces of the mounting plates (22) on both sides. The U-shaped clips (23) are clamped on both ends of the roller shaft (31) of the tensioning roller (30) and the middle of the U-shaped clips (23) is located at the corresponding notch position of the mounting grooves (21) on both sides. The side surfaces of the U-shaped clips (23) are in contact with the side surfaces of the mounting plates (22) on both sides. The U-shaped clips (23) are mounted on the mounting plates (22) by screws.

5. The belt tensioner according to claim 1, characterized in that: The first rotating member (40) is mounted on the fixed seat (10) via a mounting base (70); The second rotating member (50) is mounted on the rotating arm (20) via a mounting base (70); The mounting base (70) comprises a first mounting base unit (71) fixedly mounted on the fixing base (10) or the rotating arm (20) and a second mounting base unit (72) detachably mounted on the first mounting base unit (71), and limiting grooves (73) are respectively provided on both sides of the first mounting base unit (71) and the second mounting base unit (72), and when the second mounting base unit (72) is mounted on the first mounting base unit (71), the limiting grooves (73) of the two can form a cylindrical cavity; The first rotating member (40) and the second rotating member (50) are respectively provided with cylindrical end heads at both ends, and the cylindrical end heads at both ends of the first rotating member (40) and the second rotating member (50) are respectively located in the cylindrical cavity formed by the limiting grooves (73) on both sides.

6. The belt tensioner according to claim 5, characterized in that: Both sides of the first mounting base unit (71) and the second mounting base unit (72) respectively include an L-shaped plate (74) and a diagonal support plate (75) connecting the wing plates at both ends of the L-shaped plate (74), and the limiting groove (73) is opened at the corner of the L-shaped plate (74).

7. The belt tensioner according to claim 1, characterized in that: A spacer sleeve (80) is sleeved on the screw rod (60), and the spacer sleeve (80) is located between the nut (62) and the first rotating member (40) or the second rotating member (50).

8. The belt tensioner according to claim 1, characterized in that: A pin shaft (24) is provided at the end of the rotating arm (20) connected to the fixed seat (10), and the pin shaft (24) passes through the fixed seat (10) to realize the rotating connection between the rotating arm (20) and the fixed seat (10); A shaft sleeve (11) is provided on the fixing seat (10), the shaft sleeve (11) is sleeved on the outside of the pin shaft (24), and a first oil injection hole (12) is opened on the shaft sleeve (11).

9. The belt tensioner according to claim 8, characterized in that: The pin shaft (24) is fixedly provided with a radially extending locking end (25) at the end portion passing through the fixing seat (10), and a locking portion (26) is fixedly provided on the side of the rotating arm (20). The locking portion (26) is provided with a locking groove having the same size as the end portion of the locking end (25), and the locking end (25) is located in the locking groove.

10. The belt tensioner according to claim 1, characterized in that: The roller shaft (31) of the tensioning roller (30) is provided with a second oil injection hole (33) which is in communication with the interior of the roller wheel of the tensioning roller (30).

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