Automatic tensioning device

Abstract

The utility model discloses an automatic tensioning device which is used for tensioning a transmission belt in a transmission belt device, the transmission belt device comprises a support, a driving piece, a first belt wheel, a second belt wheel and the transmission belt, the driving piece is connected with the first belt wheel, and the transmission belt is arranged on the first belt wheel and the second belt wheel in a sleeved mode. The automatic tensioning device comprises at least one tensioning assembly and comprises a sliding block, a fixed pulley block, a movable pulley block, a first traction rope and a balance weight part, the sliding block is slidably connected with the support, a second belt pulley is rotationally connected to the sliding block, the fixed pulley block is connected with the support, the movable pulley block is connected with the sliding block, and the first traction rope is wound around the fixed pulley block and the movable pulley block. The first traction rope is connected with the counterweight piece, and the gravity of the counterweight piece is smaller than the pulling force generated by the movable pulley set to the sliding block. When the transmission belt is loosened due to plastic deformation, the counterweight piece drives the second belt wheel to move in the direction away from the first belt wheel under the action of the gravity of the counterweight piece so as to tension the transmission belt.

Description

Technical Field

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

[0002] The transmission belt device is usually composed of a driving wheel, a driven wheel and a transmission belt. The driving wheel and the driven wheel are arranged at an interval. The transmission belt is tensioned on the driving wheel and the driven wheel. The driving wheel transmits power to the driven wheel through the friction between the transmission belt and the two wheels, thereby realizing transmission. However, after the transmission belt has been running for a certain period of time under the action of tension, it will relax due to plastic deformation, causing the tension to decrease, thereby affecting the transmission efficiency. At this time, in order to ensure the transmission efficiency, the transmission belt needs to be re-tensioned.

[0003] An existing tensioning device is applied to a transmission belt device, comprising a base, a motor, a load, an adjusting bolt and a fixing bolt. The motor is connected to the load through a transmission belt. The base has a top plate and a side plate connected to each other. A slideway is provided on the top plate. The mounting seat of the motor is slidably connected to the slideway. The adjusting bolt passes through the side plate and abuts against the mounting seat of the motor, and the adjusting bolt is threadedly connected to the side plate. The fixing bolt cooperates with the nut to fix the mounting seat of the motor to the base. The fixing bolt is screwed out, and then the adjusting bolt is turned to make the mounting seat of the motor move away from the load, thereby increasing the distance between the motor and the load. Then the fixing bolt fixes the mounting seat of the motor to the base again, thereby achieving tensioning of the transmission belt.

[0004] In the above-mentioned tensioning device, when the transmission belt becomes loose due to plastic deformation, the staff needs to adjust the position of the motor on the base by rotating the adjusting bolt, so as to adjust the tension between the motor and the load. However, the staff manually adjusts the preload force of the transmission belt, which may easily cause the tension on the transmission belt to be too tight or too loose, thereby causing the transmission belt to fail to work under the rated tension, thereby shortening the life of the transmission belt. Utility Model Content

[0005] Therefore, the technical problem to be solved by the utility model is that in the prior art, when the transmission belt becomes loose due to plastic deformation, the staff is required to adjust the position of the motor on the base by rotating the adjusting bolt, so as to adjust the tension of the motor and the load. However, the staff manually adjusts the preload force of the transmission belt, which easily causes the tension on the transmission belt to be too tight or too loose, thereby causing the transmission belt to be unable to work under the rated tension, thereby shortening the life of the transmission belt.

[0006] To this end, the utility model provides an automatic tensioning device for tensioning a transmission belt in a transmission belt device, wherein the transmission belt device comprises a bracket, a driving member, a first belt pulley and a second belt pulley arranged at intervals, and a transmission belt sleeved on the first belt pulley and the second belt pulley, wherein the driving member is mounted on the bracket and is suitable for driving the first belt pulley; the automatic tensioning device comprises:

[0007] At least one tensioning assembly, the tensioning assembly comprising a slider, a fixed pulley block, a movable pulley block, a first traction rope and a counterweight, wherein:

[0008] The slider is slidably connected to the bracket and can slide along the bracket, and the slider is rotatably connected to the second pulley;

[0009] The fixed pulley block, at least one fixed pulley is connected to the bracket;

[0010] The movable pulley group, at least one movable pulley is connected to the slider;

[0011] One end of the first traction rope is fixedly connected to the bracket or the movable pulley group after passing through the fixed pulley group and the movable pulley group, and the other end is connected to the counterweight; under the action of gravity, the counterweight moves the movable pulley group through the first traction rope to drive the slider and the second pulley to move in a direction away from the first pulley, thereby tensioning the transmission belt.

[0012] Optionally, in the above-mentioned automatic tensioning device, the fixed pulley group includes at least one first fixed pulley, and the pin shaft of the first fixed pulley is fixedly connected to the bracket;

[0013] The movable pulley assembly comprises a first mounting seat and at least one first movable pulley, wherein a pin shaft of the first movable pulley is fixedly connected to the first mounting seat;

[0014] One end of the first traction rope is connected to the counterweight, and the other end is connected to the first mounting seat or the bracket, and a portion of the first traction rope is connected across the wheel surfaces of the first fixed pulley and the first movable pulley.

[0015] Optionally, the fixed pulley group includes at least one pair of the first fixed pulleys, and the movable pulley group includes one first movable pulley, the number of pairs of the first fixed pulleys is the same as the number of the first movable pulleys, and the positions of all the first fixed pulleys are higher than the position of the first movable pulleys, and multiple first movable pulleys are arranged vertically, and the pairs of first fixed pulleys are arranged on both sides above the first movable pulleys; one end of the first traction rope is connected to the first mounting seat, and the other end of the first traction rope passes around all the first fixed pulleys and the first movable pulley in the order of the first fixed pulley, the first movable pulley, and the first fixed pulley, and then is connected to the counterweight.

[0016] Optionally, in the above-mentioned automatic tensioning device, the tensioning assembly further comprises a deflection fixed pulley and a second traction rope provided between the slider and the movable pulley group, and the pin shaft of the deflection fixed pulley is fixedly connected to the bracket;

[0017] Two ends of the second traction rope are respectively connected to the slider and the first mounting seat, and a portion of the rope segment of the second traction rope is straddled on the wheel surface of the rotating fixed pulley.

[0018] Optionally, in the automatic tensioning device, two tensioning assemblies are provided, the two sliders are respectively provided at two ends of the second pulley shaft, and any one of the counterweights can drive the corresponding slider to move in a direction away from the first pulley.

[0019] Optionally, in the above-mentioned automatic tensioning device, the driving member is slidably connected to the bracket, and two of the tensioning assemblies are respectively provided on both sides of the first pulley.

[0020] Optionally, in the above-mentioned automatic tensioning device, the transmission belt device further comprises a second pulley shaft, an axial hole is formed on the slider, and the second pulley shaft is inserted into the axial hole to achieve rotatable connection with the slider.

[0021] Optionally, in the above-mentioned automatic tensioning device, the axes of the first pulley and the second pulley are located in a vertical plane or the pulley surface between the first pulley and the second pulley is located in a horizontal plane.

[0022] Optionally, the above-mentioned automatic tensioning device also includes a second mounting seat, which is located at the edge of the transmission belt and fixedly connected to the bracket. The second mounting seat has an open groove, the transmission belt is inserted into the open groove, and the transmission belt is slidably connected to the inner wall of the open groove to limit the transmission belt.

[0023] Optionally, in the above-mentioned automatic tensioning device, any one of the tensioning assemblies includes a limiting member, and the limiting member has a limiting state for limiting the slider when the slider moves toward a direction close to the first pulley.

[0024] The technical solution provided by the utility model has the following advantages:

[0025] 1. The utility model provides an automatic tensioning device, which is used for tensioning a transmission belt in a transmission belt device, wherein the transmission belt device comprises a bracket, a driving member, a first pulley, a second pulley and a transmission belt, wherein the driving member is mounted on the bracket and connected to the first pulley, the second pulley is spaced apart from the first pulley, the transmission belt is sleeved on the first pulley and the second pulley, the driving member can drive the first pulley to rotate, so as to drive the second pulley to rotate; the automatic tensioning device comprises at least one tensioning assembly, the tensioning assembly comprises a slider, a fixed pulley group, The movable pulley block, the first traction rope and the counterweight, the slider is slidably connected to the bracket, and the slider is rotatably connected with the second pulley, the fixed pulley block is connected to the bracket, the movable pulley block is connected to the slider, the first traction rope is wound around the fixed pulley block and the movable pulley block, and the first traction rope is connected to the counterweight. Due to the movable pulley, the pulling force generated by the movable pulley block on the slider is greater than the gravity of the counterweight, and a larger pulling force can be generated without a larger counterweight; the counterweight has a tension state in which it moves along the gravity direction under the action of gravity to drive the second pulley away from the first pulley. When the transmission belt is relaxed due to plastic deformation, the counterweight drives the second pulley to move in the direction away from the first pulley under the action of its own gravity until the preload generated by the transmission belt is equal to the pulling force of the movable pulley block on the slider. At this time, the transmission belt is re-tensioned. Since the mass of the counterweight is constant, the preload generated by the transmission belt is also a constant value, thereby avoiding excessive tension or looseness in the transmission, so that the transmission belt works under the rated tension and prolongs the life of the transmission belt. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 A schematic diagram of the structure of an automatic tensioning device provided in an embodiment of the utility model;

[0028] Figure 2 A cross-sectional view of an automatic tensioning device provided by an embodiment of the utility model;

[0029] Figure 3 A schematic diagram of the structure of a tensioning assembly, a part of a bracket, a part of a transmission belt, and a second pulley provided in an embodiment of the utility model;

[0030] Figure 4A schematic diagram of the structure of a fixed pulley block, a movable pulley block, a first traction rope, a deflection fixed pulley, a second traction rope, a portion of a transmission belt and a second pulley provided in an embodiment of the utility model;

[0031] Figure 5 A schematic structural diagram of a first pulley, a second pulley, a transmission belt, and a tensioning assembly provided in an embodiment of the utility model.

[0032] Description of reference numerals:

[0033] 101, bracket; 102, driving member; 103, second pulley; 104, transmission belt; 105, first pulley;

[0034] 201, slider; 202, fixed pulley block; 2021, first fixed pulley (A1, A2, A3, A4); 203, movable pulley block; 2031, first mounting seat; 2032, first movable pulley (B1, B2); 204, first traction rope; 205, counterweight; 2051, counterweight seat; 2052, weight; 206, steering fixed pulley; 207, second traction rope;

[0035] 300. Second mounting seat; 301. Opening slot. DETAILED DESCRIPTION

[0036] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 the internal communication of 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.

[0039] 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.

[0040] Example 1

[0041] This embodiment provides an automatic tensioning device, such as Figures 1 to 5 As shown, the automatic tensioning device is used for a transmission belt device and is used to automatically tension a transmission belt 104. The transmission belt device includes a bracket 101, a driving member 102, a first pulley 105, a second pulley 103 and a transmission belt 104. The driving member 102 is installed on the bracket 101 and connected to the first pulley. The second pulley 103 is spaced apart from the first pulley 105. The transmission belt 104 is sleeved on the first pulley and the second pulley 103. The driving member 102 can drive the first pulley 105 to rotate, so as to drive the second pulley 103 to rotate. The automatic tensioning device includes a tensioning assembly, which includes a slider 201, a fixed pulley group 202, a movable pulley group 203, a first traction rope 204 and a counterweight 205. The slider 201 It is slidably connected to the bracket 101 and can slide along the bracket, and the slider 201 is rotatably connected to the second pulley 103, the fixed pulley group 202 includes at least one fixed pulley, at least one fixed pulley is connected to the bracket 101, the movable pulley group 203 includes at least one movable pulley, at least one movable pulley group 203 is connected to the slider 201, one end of the first traction rope 204 is fixedly connected to the bracket 101 or the movable pulley group after passing through the fixed pulley group 202 and the movable pulley group 203, and the other end is connected to the counterweight 205; under the action of gravity, the counterweight 205 moves the movable pulley group 203 through the first traction rope 204, so as to drive the slider 201 and the second pulley 103 to move in a direction away from the first pulley 105, thereby tensioning the transmission belt 104.

[0042] Specifically, the material of the bracket 101 is a rigid material, and the bracket 101 is used to provide support for the driving member 102 and the tensioning assembly and provide an installation position. The preferred bracket 101 is composed of rods; the driving member 102 can be a motor, a turbine, a steam turbine or other device that performs a rotating motion. The preferred driving member 102 includes a servo motor and a reducer. The housing of the servo motor and the housing of the reducer are both fixedly connected to the bracket 101. The fixing method can be bolt connection, welding or other common fixing methods. The drive shaft of the servo motor is connected to the reducer; the transmission belt device also includes a first pulley shaft and a second pulley shaft, the first pulley is sleeved on the first pulley shaft, the second pulley 103 is sleeved on the second pulley shaft, and one end of the first pulley shaft is fixedly connected to the transmission shaft of the reducer The other end is connected to the bracket 101 for rotation, the second pulley shaft is spaced apart from the first pulley shaft, and the transmission belt 104 is tensioned on the first pulley and the second pulley 103; a slide groove or a slide rail is provided on the bracket 101, and the slider 201 is slidably connected to the slide groove or the slide rail, and the slider 201 can be U-shaped, and both ends of the second pulley shaft are connected to the slider 201 for rotation, and the fixed pulley group 202 is used to change the direction of the force so that the weight of the counterweight 205 itself is used as the pulling force on the slider 201, and the movable pulley group 203 is used to save effort so that the weight of the counterweight 205 is less than the preload force of the transmission belt 104, that is, the lighter counterweight 205 can generate a larger preload force, thereby avoiding the use of a heavier counterweight 205, thereby reducing the difficulty of carrying the counterweight 205. The first traction rope 204 can be a steel wire rope, a natural fiber rope or a chemical fiber rope.

[0043] The automatic tensioning device provided in this embodiment has the following characteristics: when the transmission belt 104 becomes loose due to plastic deformation, the counterweight 205 drives the second pulley 103 to move in a direction away from the first pulley under the action of its own weight, until the preload force generated by the transmission belt 104 is equal to the pulling force of the movable pulley group 203 on the slider 201. At this time, the transmission belt 104 is re-tensioned. Since the mass of the counterweight 205 is constant, the preload force generated by the transmission belt 104 is also a constant value, thereby avoiding excessive tension or looseness in the transmission, allowing the transmission belt 104 to work under the rated tension, thereby extending the life of the transmission belt 104.

[0044] The automatic tensioning device provided in this embodiment is as follows: Figure 3 and Figure 4 As shown, the fixed pulley block 202 includes a first fixed pulley 2021, and the movable pulley block 203 includes a first mounting seat 2031 and a first movable pulley 2032. The number of the first fixed pulley 2021 and the first movable pulley 2032 can be adjusted according to the mass of the counterweight.

[0045] Preferably, in this embodiment, the number of the first fixed pulleys 2021 is two pairs, a total of four, the four first fixed pulleys 2021 are rotatably connected to the bracket 101 through a pin, and the pin is fixedly connected to the bracket 101, the four first fixed pulleys 2021 are respectively A1, A2, A3, A4, the number of the first movable pulleys 2032 is two, the two first movable pulleys 2032 are rotatably connected to the first mounting seat 2031 through a pin, and the pin is fixedly connected to the first mounting seat 2031, the two first movable pulleys 2032 are respectively B1 and B2, as shown in FIG. Figure 4 As shown, the positions of all first fixed pulleys 2021 are higher than the position of the first movable pulley 2032, and the multiple first movable pulleys 2032 are arranged vertically, and the paired first fixed pulleys 2021 are respectively on both sides above the first movable pulleys 2032; one end of the first traction rope 204 is tied to the upper end of the second mounting seat, and the other end is connected to the counterweight 205 after passing through A1, B1, A2, B2, A3, and A4 in sequence. The first traction rope 204 has five rope segments acting on the first mounting seat 2031 and the two movable pulleys, so the gravity of the counterweight 205 itself is equal to one-fifth of the pulling force acting on the slider 201 (excluding the first traction rope 204, the two movable pulleys, and and the gravity of the first mounting seat 2031). Of course, those skilled in the art can also adjust the number of first fixed pulleys 2021, the number of first movable pulleys 2032 and the winding method of the first traction rope 204 to change the multiple relationship between the gravity of the counterweight 205 itself and the pulling force on the slider 201, such as one-half, one-eighth, one-tenth or other multiple relationships. By making the gravity of the counterweight 205 equal to one-fifth of the pulling force acting on the slider 201 (ignoring the gravity of the first traction rope, the two first movable pulleys and the first mounting seat), on the one hand, the lighter counterweight 205 can generate a preset pulling force, and on the other hand, the complexity of assembly can be reduced.

[0046] It should be noted that the number of the first fixed pulleys 2021 is not limited in this embodiment. The above takes four first fixed pulleys 2021 as an example. In addition, two first fixed pulleys 2021 and one first movable pulley 2032 may be set. One end of the first traction rope 204 is connected to the first mounting seat 2031, and the other end passes through all the first fixed pulleys 2021 and all the first movable pulleys 2032 in the order of the first fixed pulley 2021, the first movable pulley 2032, and the first fixed pulley 2021, and then is connected to the counterweight 205. In addition, eight first fixed pulleys 2021, four first fixed pulleys 2021, or other numbers of first fixed pulleys 2021 may be set as needed.

[0047] In an alternative implementation, the fixed pulley includes a first fixed pulley, the movable pulley group includes a first movable pulley, one end of the first traction rope 204 is tied to the bracket 101, and the other end is connected to the counterweight 205 after passing through the first movable pulley and the first fixed pulley in sequence. The first fixed pulley is used to use the gravity of the counterweight 205 as a pulling force on the slider 201. The first traction rope 204 has two rope segments acting on the first movable pulley. Therefore, the gravity of the counterweight 205 is equal to half of the pulling force acting on the slider 201 (ignoring the gravity of the first traction rope 204, the two second movable pulleys and the second mounting seat). Of course, those skilled in the art can also adjust the number of second fixed pulleys, the number of second movable pulleys and the winding method of the first traction rope 204 to change the multiple relationship between the gravity of the counterweight 205 and the pulling force on the slider 201.

[0048] The automatic tensioning device provided in this embodiment is as follows: Figures 3 to 5 As shown, the tensioning assembly also includes a deflection fixed pulley 206 and a second traction rope 207 arranged between the slider 201 and the movable pulley group 203. The number of the deflection fixed pulleys 206 can be adjusted as needed. Preferably, two deflection fixed pulleys 206 are used in this embodiment. Both deflection fixed pulleys 206 are rotatably connected to the bracket 101, that is, the pin shaft of any deflection fixed pulley 206 is fixedly connected to the bracket 101. The second traction rope 207 can be a steel wire rope, a natural fiber rope or a chemical fiber rope. One end of the second traction rope 207 is tied to the slider 201, and the other end passes through the two deflection fixed pulleys 206 in sequence and then is connected to the movable pulley group 203. Figure 4 As shown, two deflection fixed pulleys 206 are used to make the pulling force on the slider 201 vertically upward.

[0049] In an alternative implementation, the deflection fixed pulley 206 does not exist, and the first mounting seat 2031 can be directly fixedly connected to the slider 201, or the first mounting seat 2031 can be connected to the slider 201 through a traction rope.

[0050] like Figure 1 and Figure 2 As shown, the automatic tensioning device provided in this embodiment has two tensioning assemblies, and the two tensioning assemblies are respectively arranged on both sides of the second pulley 103 axis, that is, the two sliders 201 are respectively arranged at both ends of the second pulley axis, and any second traction rope 207 is used to drive the corresponding slider 201 to move in the direction away from the first pulley, and the two tensioning assemblies are respectively used to drive the two sides of the second pulley axis to move, so as to keep the tension on both sides of the second pulley axis uniform and avoid excessive tension on one side of the second pulley.

[0051] The automatic tensioning device provided in this embodiment has two tensioning assemblies respectively disposed on both sides of the first pulley, and the driving member 102 is slidably connected to the bracket 101 via the slider 201 to achieve the first pulley and the second pulley 103 moving away from or close to each other.

[0052] like Figure 2 As shown, the automatic tensioning device provided in this embodiment also includes a second mounting seat 300, the axes of the first pulley and the second pulley 103 are parallel to the vertical plane, and the transmission belt 104 is also parallel to the vertical plane, that is, a vertical belt drive, and the second mounting seat 300 is fixed on the bracket 101. An open groove 301 is provided on the upper part of the second mounting seat 300, and the lower edge of the transmission belt 104 is inserted into the open groove 301 and is slidably connected to the open groove 301. The second mounting seat 300 is provided with two edges of the transmission belt 104 arranged on both sides, which receive the transmission belt 104 through the open groove 301 to prevent the transmission belt 104 from deviating from the transmission pulley.

[0053] In an alternative implementation, the axes of the first pulley and the second pulley 103 are parallel to the horizontal plane, and the transmission belt 104 is also parallel to the horizontal plane, that is, a horizontal belt drive.

[0054] like Figure 2 As shown, the automatic tensioning device provided in this embodiment, the counterweight 205 includes a counterweight seat 2051 and a weight 2052. The counterweight seat 2051 is composed of a bottom plate and a vertical rod fixed thereon. The top of the vertical rod is hooked or tied with the first traction rope 204. The weight 2052 is provided with a notch, which is inserted into the vertical rod. The weight 2052 is placed on the bottom plate. The counterweight is increased by stacking the weights 2052 on the bottom plate. The pulling force acting on the slider 201 can be accurately adjusted by the weights 2052, so that the tension of the transmission belt 104 can be accurately adjusted.

[0055] In the automatic tensioning device provided in this embodiment, any tensioning assembly also includes a limiter, and the limiter has a limit state of the slider 201 when the slider 201 moves toward the direction close to the first pulley. When materials are placed on the transmission belt 104 or the weight of the materials on the transmission belt 104 increases, the tension of the transmission belt 104 on the slider 201 increases, and because the limiter limits the slider 201, the slider 201 is prevented from moving toward the first pulley, thereby avoiding the sagging of the transmission belt 104, and further avoiding the jumping and slipping of the transmission belt 104 during the transmission process, so that the transmission belt 104 works normally. In addition, the automatic tensioning device can automatically realize the tensioning of the transmission belt 104 without manual regular tensioning operation, thereby improving the working efficiency and utilization rate of the equipment.

[0056] The automatic tensioning device provided in this embodiment has a limiter rotatably connected to the bracket 101, and a clamping portion is provided on the slider 201, the clamping portion includes a plurality of protrusions, and the plurality of protrusions are evenly spaced along the moving direction of the slider 201, or can be distributed at proportional intervals, and the plurality of protrusions can also be connected end to end in sequence, and any protrusion has a connected abutment surface and a sliding surface; the limiter is a pawl, and any protrusion is a tooth that cooperates with the pawl, and the free end of the limiter has a connected fitting surface and a blocking surface, and the limiter is under the action of its own gravity so that the fitting surface fits with the sliding surface of one of the protrusions, when material is placed on the transmission belt 104 or the weight of the material on the transmission belt 104 increases During the tensioning process, the slider 201 moves in the direction away from the first pulley under the action of the gravity of the material on the transmission belt 104, so that the abutment surface of the adjacent upstream protrusion abuts against the blocking surface, thereby limiting the slider 201 and preventing the slider 201 from continuing to move in the direction close to the first pulley; during the tensioning process, the slider 201 moves in the direction away from the first pulley under the action of the tension of the counterweight 205. At this time, the contact surface is slidably connected with the corresponding sliding surface. As the slider 201 continues to move, the contact surface slides from the sliding inclined surface to the sliding inclined surface of the adjacent downstream protrusion until the tension of the traction rope on the slider 201 is balanced with the elastic force of the transmission belt 104 on the slider 201.

[0057] In a replaceable embodiment, the bracket 101 has a mounting hole, the limiting member is a telescopic rod, the limiting member is slidably connected to the mounting hole, the limiting member can extend out of the mounting hole under the action of its own gravity, the engaging portion is a plurality of plug holes spaced apart along the moving direction of the slider 201, any plug hole has an inclined surface and a vertical surface, the inclined surface is inclined in the direction away from the first pulley, when the material is placed on the transmission belt 104 or the weight of the material on the transmission belt 104 increases, the slider 201 moves toward the direction close to the first pulley, the limiting member extends out of the mounting hole under the action of gravity and is inserted into the corresponding plug hole below it, at this time, the limiting member abuts against the vertical surface to prevent the slider 201 from continuing to move toward the first pulley. During the tensioning process, the slider 201 moves in the direction away from the first pulley, and drives the limiting member to slide and connect with the inclined surface, and as the slider 201 continues to move, the limiting member slides out of the plug hole and retracts into the mounting hole.

[0058] The automatic tensioning device provided in this embodiment also includes a damping member, which can be a torsion spring, or a spring or other elastic member. One end of the damping member is fixedly connected to the bracket 101, and the other end of the damping member is connected to the limit member. When the limit member rotates in a direction away from the slider 201, the damping member generates a corresponding damping force, which is used to make the limit member press against the slider 201.

[0059] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. An automatic tensioning device, used for tensioning a transmission belt (104) in a transmission belt device, the transmission belt device comprising a bracket (101), a driving member (102), a first pulley (105) and a second pulley (103) arranged at intervals, and a transmission belt (104) sleeved on the first pulley (105) and the second pulley (103), wherein the driving member (102) is mounted on the bracket (101) and is suitable for driving the first pulley (105); characterized in that: The automatic tensioning device comprises: At least one tensioning assembly, the tensioning assembly comprising a slider (201), a fixed pulley block (202), a movable pulley block (203), a first traction rope (204) and a counterweight (205), wherein: The slider (201) is slidably connected to the bracket (101) and can slide along the bracket (101); the slider (201) is rotatably connected to the second pulley (103); The fixed pulley group (202), at least one fixed pulley is connected to the bracket (101); The movable pulley group (203), at least one movable pulley is connected to the slider (201); One end of the first traction rope (204) is fixedly connected to the bracket (101) or the movable pulley group (203) after passing through the fixed pulley group (202) and the movable pulley group (203), and the other end is connected to the counterweight (205); under the action of gravity, the counterweight (205) moves the movable pulley group (203) through the first traction rope (204), so as to drive the slider (201) and the second pulley (103) to move in a direction away from the first pulley (105), thereby tensioning the transmission belt (104).

2. The automatic tensioning device according to claim 1, characterized in that: The fixed pulley assembly (202) comprises at least one first fixed pulley (2021), and a pin shaft of the first fixed pulley (2021) is fixedly connected to the bracket (101); The movable pulley assembly (203) comprises a first mounting seat (2031) and at least one first movable pulley (2032), wherein a pin shaft of the first movable pulley (2032) is fixedly connected to the first mounting seat (2031); One end of the first traction rope (204) is connected to the counterweight (205), and the other end is connected to the first mounting seat (2031) or the bracket (101), and a portion of the first traction rope (204) is bridged over the wheel surfaces of the first fixed pulley (2021) and the first movable pulley (2032).

3. The automatic tensioning device according to claim 2, characterized in that: The fixed pulley group comprises at least one pair of the first fixed pulleys (2021), and the movable pulley group comprises one first movable pulley (2032). The number of pairs of the first fixed pulleys (2021) is the same as the number of the first movable pulleys (2032), and the positions of all the first fixed pulleys (2021) are higher than the positions of the first movable pulleys (2032). The plurality of first movable pulleys (2032) are arranged vertically, and the pairs of the first fixed pulleys (2021) are arranged on both sides above the first movable pulleys (2032). One end of the first traction rope (204) is connected to the first mounting seat (2031), and the other end of the first traction rope (204) is connected to the counterweight (205) after passing through all the first fixed pulleys (2021) and the first movable pulley (2032) in the order of the first fixed pulley (2021), the first movable pulley (2032), and the first fixed pulley (2021).

4. The automatic tensioning device according to claim 3, characterized in that: The tensioning assembly further comprises a deflection fixed pulley (206) and a second traction rope (207) arranged between the slider (201) and the movable pulley group (203); the pin shaft of the deflection fixed pulley (206) is fixedly connected to the bracket (101); The two ends of the second traction rope (207) are respectively connected to the slider (201) and the first mounting seat (2031), and a portion of the rope section of the second traction rope (207) is bridged over the wheel surface of the deflection fixed pulley (206).

5. The automatic tensioning device according to claim 4, characterized in that: The tensioning assembly is provided with two sliders (201), which are respectively provided at the two ends of the second pulley shaft, and any one of the counterweights (205) can drive the corresponding slider (201) to move in a direction away from the first pulley (105).

6. The automatic tensioning device according to claim 5, characterized in that: The driving member (102) is slidably connected to the bracket (101), and two tensioning assemblies are respectively arranged on both sides of the first pulley.

7. The automatic tensioning device according to any one of claims 1 to 6, characterized in that: The transmission belt device also includes a second pulley shaft. The slider (201) is provided with an axial hole. The second pulley shaft is inserted into the axial hole to achieve a rotatable connection with the slider (201).

8. The automatic tensioning device according to any one of claims 1 to 6, characterized in that: The axes of the first belt pulley and the second belt pulley (103) are located in a vertical plane or the wheel surface between the first belt pulley and the second belt pulley (103) is located in a horizontal plane.

9. The automatic tensioning device according to any one of claims 1 to 6, characterized in that: It also includes a second mounting seat (300), which is located at the edge of the transmission belt (104) and is fixedly connected to the bracket (101); the second mounting seat (300) has an open groove (301), the transmission belt (104) is inserted into the open groove (301), and the transmission belt (104) is slidably connected to the inner wall of the open groove (301) to limit the transmission belt (104).

10. The automatic tensioning device according to any one of claims 1 to 6, characterized in that: Any one of the tensioning assemblies comprises a limiting member, wherein the limiting member has a limiting state for limiting the slider (201) when the slider (201) moves in a direction close to the first pulley.

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