Bandsaw machine with tensioning assembly

Abstract

The utility model discloses a band sawing machine with tensioning assembly, including frame, saw wheel mechanism, saw wheel mechanism includes driving wheel, passive wheel and saw blade, driving wheel is connected in frame through first transmission shaft and rotates, and passive wheel is connected with frame through second transmission shaft, and the both ends of saw blade are respectively set up in driving wheel and passive wheel, be equipped with the shaft sleeve on second transmission shaft, and the shaft sleeve can move along the first direction, and passive wheel rotatablely is sleeved in the outer of shaft sleeve, be equipped with the connecting portion on the shaft sleeve, and the connecting portion projects the end face of passive wheel along the second direction, tensioning mechanism, tensioning mechanism includes jacking piece and drive part, and jacking piece is connected with the connecting portion, drive part is used for drive jacking piece and moves along the first direction, and jacking connecting portion when jacking piece moves along the first direction, because drive part and jacking piece are all externally installed on the outside of transmission shaft, when overhauling, can independently dismount drive part, need not to disassemble passive wheel, bearing group and other saw wheel mechanism parts, and maintenance is convenient.

Description

Technical Field

[0001] This utility model relates to the field of band saws, and more particularly to a band saw with a tensioning component. Background Technology

[0002] Band saws utilize a core transmission system consisting of a drive wheel, a driven wheel, and a saw blade. The saw blade wraps around the drive and driven wheels. The drive wheel is powered by a motor via a reducer and other drive mechanisms. The friction between the wheel surface and the saw blade drives the blade in a cyclical motion, which in turn drives the driven wheel to rotate synchronously, enabling the saw blade to continuously and efficiently complete the cutting operation. During long-term, high-frequency use, the saw blade is prone to loosening due to material fatigue, thermal expansion and contraction, and stress deformation. This can lead to decreased cutting accuracy, abnormal wear, and even breakage of the saw blade. Therefore, the tension needs to be adjusted periodically.

[0003] Currently, hydraulic drive adjustment is one of the mainstream methods for saw blade tensioning. This method integrates a hydraulic cylinder inside the drive shaft of the driven wheel or near the bearing housing, rigidly connecting the piston rod to the bushing of the driven wheel. When the hydraulic system is activated, the piston rod extends and retracts, causing the bushing to shift, thereby changing the center distance between the driving and driven wheels and adjusting the saw blade tension. However, because the hydraulic drive is located inside the transmission structure, maintenance requires the sequential disassembly of multiple components such as the saw blade, protective cover, driven wheel, and bearing assembly. This cumbersome disassembly and assembly process is time-consuming and inconvenient for maintenance. Utility Model Content

[0004] In order to overcome at least one of the defects described in the prior art, the present invention provides a band saw with a tensioning component, which is convenient to maintain.

[0005] The technical solution adopted by this utility model to solve its problem is:

[0006] A band saw with a tensioning component includes:

[0007] frame;

[0008] A saw wheel mechanism includes a drive wheel, a driven wheel, and a saw blade; the drive wheel is spaced apart from the driven wheel in a first direction; the drive wheel is rotatably connected to the frame via a first transmission shaft, and the driven wheel is connected to the frame via a second transmission shaft; one end of the saw blade is sleeved on the drive wheel, and the other end of the saw blade is sleeved on the driven wheel, so that the driven wheel rotates synchronously with the drive wheel;

[0009] The first drive shaft and the second drive shaft extend along a second direction respectively; a bushing is provided on the second drive shaft, the bushing is movable along a first direction, and the driven wheel is rotatably fitted onto the bushing; a connecting part is provided on the bushing, the connecting part protruding from the end face of the driven wheel along the second direction;

[0010] The tensioning mechanism includes a lifting member and a driving member. The lifting member is connected to the connecting part. The driving member is used to drive the lifting member to move along a first direction. When the lifting member moves along the first direction, it lifts the connecting part.

[0011] Furthermore, the bushing has connecting portions on both sides, the lifting member includes two lifting plates and a connecting plate, the two lifting plates extend along the first direction and are symmetrically distributed on both sides of the drive wheel; one end of the two lifting plates is connected to the two connecting portions respectively, and the other end of the two lifting plates is connected via the connecting plate; the drive member is connected to the connecting plate.

[0012] Furthermore, the driving component includes a driving cylinder and a piston rod, the piston rod being connected to the connecting plate along the first direction, and the driving cylinder being used to drive the piston rod to move along the first direction.

[0013] Furthermore, it also includes a support base located between the driving wheel and the driven wheel and extending along the second direction, and the tensioning mechanism is mounted on the support base.

[0014] Furthermore, the support base is provided with connecting arms at both ends, the connecting arms extend along the first direction and are connected to both ends of the transmission shaft.

[0015] Furthermore, the support base is provided with a mounting groove, and the driving component is installed in the mounting groove.

[0016] Furthermore, there are multiple driving wheels and multiple driven wheels, with the driving wheels spaced apart in the second direction and the multiple driven wheels corresponding to each driving wheel; multiple bushings are provided on the second transmission shaft, and the multiple bushings are respectively connected to the multiple driven wheels; each bushing is provided with a connecting part, and the tensioning mechanism is provided in multiple sets.

[0017] Furthermore, the connecting portion includes a raised ring, the inner diameter of which is smaller than the inner diameter of the bushing.

[0018] Furthermore, the bushing is provided with a through cavity, the through cavity passing through the bushing and the connecting part, and the drive shaft passing through the through cavity; the cross-section of the drive shaft is square, and the cross-section of the through cavity is square.

[0019] Furthermore, the lifting member is provided with a through hole, and the connecting part passes through the through hole, which is a square hole.

[0020] In summary, the band saw with a tensioning assembly provided by this utility model has the following technical advantages: The driven wheel forms a clearance fit with the second drive shaft through a bushing. Because the connecting part of the bushing is designed in a stepped manner and protrudes from the end face of the driven wheel, and the connecting part is connected to the lifting member of the tensioning mechanism, when the driving component outputs thrust to drive the lifting member to move in the first direction (vertical direction), the bushing synchronously generates axial displacement under the action of the lifting member, thereby driving the driven wheel to slide in the vertical direction, realizing the adjustment of the saw blade tension. Since both the driving component and the lifting member are externally mounted on the outside of the drive shaft, the driving component can be disassembled and reassembled independently during maintenance, without disassembling the driven wheel, bearing assembly, or other saw wheel mechanism components, making maintenance convenient. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] Figure 2 This is a cross-sectional view of the structure of this utility model;

[0024] Figure 3 This is a schematic diagram of the assembly of the passive wheel and the tensioning mechanism in this utility model;

[0025] Figure 4 This is a schematic diagram of the lifting component in this utility model;

[0026] Figure 5 This is a schematic diagram of the structure of the bushing of this utility model;

[0027] Figure 6 This is a schematic diagram of the transmission shaft in this utility model.

[0028] The meanings of the reference numerals in the attached figures are as follows:

[0029] 10. Frame; 11. Drive shaft; 20. Drive wheel; 21. First drive shaft; 30. Driven wheel; 31. Second drive shaft; 311. Connecting part; 3111. Raised ring; 3112. Through-hole; 40. Tensioning mechanism; 41. Lifting component; 411. Lifting plate; 412. Connecting plate; 413. Through-hole; 42. Driving component; 421. Driving cylinder; 422. Piston rod; 50. Support seat; 51. Connecting arm; 52. Mounting slot. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0032] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0033] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0034] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0035] The technical solution of this utility model will be further described below with reference to the embodiments and accompanying drawings.

[0036] See Figures 1 to 6This utility model discloses a band saw with a tensioning assembly, including: a frame 10, a saw wheel mechanism, and a tensioning mechanism 40. Specifically, the saw wheel mechanism includes a drive wheel 20, a driven wheel 30, and a saw blade. The drive wheel 20 is spaced apart from the driven wheel 30 in a first direction. The drive wheel 20 is rotatably connected to the frame 10 via a first transmission shaft 21, and the driven wheel 30 is connected to the frame 10 via a second transmission shaft 31. One end of the saw blade is fitted onto the drive wheel 20, and the other end of the saw blade is fitted onto the driven wheel 30, so that the driven wheel 30 rotates synchronously with the drive wheel 20.

[0037] Furthermore, the first drive shaft 21 and the second drive shaft 31 extend along a second direction, respectively. A bushing is provided on the second drive shaft 31, which is movable along a first direction. The driven wheel 30 is rotatably fitted onto the bushing. A connecting portion 311 is provided on the bushing, which protrudes from the end face of the driven wheel 30 along the second direction. The tensioning mechanism 40 includes a lifting member 41 and a driving member 42, which connects the lifting member 41 to the connecting portion 311. The driving member 42 is used to drive the lifting member 41 to move along the first direction, and when the lifting member 41 moves along the first direction, it lifts the connecting portion 311.

[0038] Based on the above structure, with the first direction as the vertical direction and the second direction as the horizontal direction (e.g.) Figure 1 Taking the example shown, the driving wheel 20 and the driven wheel 30 are arranged vertically (first direction) at intervals, and are connected to the frame 10 through a horizontally extending (second direction) drive shaft 11. The driving wheel 20 receives power input through the first drive shaft 21, while the driven wheel 30 is connected to the frame 10 through the second drive shaft 31. The saw blade is fitted in a ring structure on the outer surfaces of the driving wheel 20 and the driven wheel 30, forming a closed transmission circuit. When the driving wheel 20 rotates under power, the friction between the saw blade and the wheel surface drives the driven wheel 30 to rotate synchronously, thereby realizing the cyclic movement of the saw blade.

[0039] To achieve flexible adjustment of the saw blade tension, a bushing that can move vertically is mounted on the second drive shaft 31. The driven wheel 30 is rotatably fitted onto the outer surface of the bushing via a rolling bearing, allowing it to rotate freely while moving with the bushing. Simultaneously, a connecting portion 311 extending horizontally (second direction) is provided on the outer side of the bushing, protruding from the end face of the driven wheel 30 for connection to the lifting member 41 of the tensioning mechanism 40. This effectively avoids interference of the connecting structure with the rotational freedom of the driven wheel 30.

[0040] Specifically, when the saw blade tension needs to be adjusted, the drive unit 42 starts and pushes the lifting unit 41 upward in the vertical direction (first direction). The lifting unit 41 transmits the thrust to the bushing through the connecting part 311, causing the driven wheel 30 to move upward synchronously. When the driven wheel 30 moves vertically, the distance between the drive wheel 20 and the driven wheel 30 increases. During this process, the saw blade, as an elastic body, generates an elastic restoring force during tensile deformation. This restoring force is the saw blade tension. As the displacement of the driven wheel 30 increases, the saw blade elongation increases, and the tension also increases accordingly, thereby achieving the adjustment of the saw blade tension. Conversely, when the drive unit 42 drives the lifting unit 41 downward, the saw blade relaxes, and the tension decreases, meeting the usage requirements under different working conditions.

[0041] It should be noted that the connecting part 311 in this embodiment can be a block or columnar structure (such as a protruding block or a connecting column) formed on the bushing; of course, the connecting part 311 can also be formed by a snap-fit, threaded connection or welding method to a snap-fit ​​block, screw or pin or other connecting parts connected to the bushing, and the specific design can be based on actual needs.

[0042] In addition, the lifting member 41 in this embodiment can be a rod-shaped, column-shaped, or plate-shaped structure arranged along the first direction. During assembly, the lifting member 41 is connected to the connecting part 311 in a detachable manner such as threaded connection or snap-fit, so as to facilitate subsequent disassembly and maintenance. The driving member 42 can be an existing hydraulic cylinder or pneumatic cylinder driven, connected to the lifting member 41 through a piston. The cylinder provides driving force to make the piston move linearly, thereby driving the lifting member 41 to move linearly. Of course, the driving member 42 can also be an existing servo motor or stepper motor, with the motor shaft directly connected to the lifting member 41, so that the rotation of the motor shaft drives the lifting member 41 to move linearly. Alternatively, the motor shaft can be connected to the lifting member 41 through a transmission component such as a lead screw and nut, so as to drive the lifting member 41 to move linearly. The specific configuration can be set according to the actual needs.

[0043] Preferably, the driving component 42 in this embodiment is a conventional hydraulic cylinder drive, specifically including a driving cylinder body 421 and a piston rod 422. The piston rod 422 is connected to the connecting plate 412 along a first direction. The driving cylinder body 421 provides driving force to drive the piston rod 422 to move along the first direction. Pressure is provided by a hydraulic pump so that the hydraulic oil in the driving cylinder body 421 pushes the piston rod 422 to move, thereby driving the connecting plate 412 connected to the piston rod 422 to move along the first direction, causing the lifting plate 411 to move along the first direction.

[0044] Furthermore, both sides of the bushing are provided with connecting parts 311, and the lifting member 41 includes two lifting plates 411 and a connecting plate 412. The two lifting plates 411 extend along the first direction and are symmetrically distributed on both sides of the drive wheel 20. One end of the two lifting plates 411 is connected to the two connecting parts 311 respectively, and the other end of the two lifting plates 411 is connected via the connecting plate 412. The driving member 42 is connected to the connecting plate 412.

[0045] Specifically, if a single-sided push is used, the bushing may rotate or tilt due to torque imbalance. Therefore, in this embodiment, two lifting plates 411 are symmetrically distributed on both sides of the driving wheel 20. The passive wheel 30 is pushed synchronously through the connecting parts 311 on both sides of the bushing, so that the passive wheel 30 moves stably in the vertical direction, so that the tension on both sides of the saw blade is consistent, thus avoiding bushing tilt or uneven saw blade tension caused by unilateral force.

[0046] More specifically, since the two lifting plates 411 are connected by the connecting part 311, the drive component 42 only needs to be connected to the connecting plate 412 to synchronously push the bushing through the lifting plates 411 on both sides, eliminating the need for a complex dual-side independent drive system, thus indirectly reducing control difficulty and cost.

[0047] Furthermore, it also includes a support base 50, which is located between the driving wheel 20 and the driven wheel 30 and extends along the second direction, and the tensioning mechanism 40 is installed on the support base 50.

[0048] Specifically, the support base 50, as the core load-bearing component, is arranged along the second direction (the horizontal direction of the frame 10) between the drive wheel 20 and the driven wheel 30, providing a stable mounting base for the tensioning mechanism 40. When the drive component 42 pushes the driven wheel 30 to adjust the saw blade tension, the support base 50 evenly transmits the tension to the frame 10, avoiding structural deformation caused by local stress concentration, and further improving the system's vibration resistance and long-term operational reliability.

[0049] It should be noted that, in this embodiment, the two ends of the support base 50 can be connected to the frame 10 by high-strength bolts or pins and other connecting parts.

[0050] Furthermore, in this embodiment, the support base 50 is provided with connecting arms 51 at both ends, and the connecting arms 51 are extended along the first direction to connect with the two ends of the transmission shaft 11.

[0051] Specifically, compared to the case where the support base 50 is directly connected to the frame 10, if the bearing of the drive shaft 11 is damaged, the entire connection between the support base 50 and the frame 10 needs to be disassembled, which is time-consuming and labor-intensive. Therefore, in this embodiment, the support base 50 is connected to the drive shaft 11 through the connecting arm 51. When it is necessary to disassemble and maintain the support base 50 or the tensioning mechanism 40, it is only necessary to disassemble the connecting arm 51 and the drive shaft 11. The support base 50 can be removed for replacement or maintenance, which is more convenient.

[0052] In addition, since the connecting arms 51 are connected to both sides of the drive shaft 11, they can also block the driven wheel 30 located on the drive shaft 11 to prevent it from shifting in the second direction during the processing.

[0053] More specifically, the support base 50 is provided with a mounting groove 52, the size of which matches the drive component 42. Thus, when the drive component 42 is placed in the mounting groove 52, the groove wall of the mounting groove 52 can block and position the drive component 42, preventing the drive component 42 from shifting or deviating during operation and improving its stability.

[0054] Furthermore, there are multiple driving wheels 20 and multiple driven wheels 30. The multiple driving wheels 20 are spaced apart in the second direction, and the multiple driven wheels 30 are arranged in a one-to-one correspondence with the multiple driving wheels 20. The second transmission shaft 31 is provided with multiple bushings, and the multiple bushings are respectively connected to the multiple driven wheels 30. Each bushing is provided with a connecting part 311, and the tensioning mechanism 40 is provided with multiple sets.

[0055] Based on this structure, multiple driving wheels 20 and multiple driven wheels 30 are set, with each driven wheel 30 connected to the second drive shaft 31 via an independent bushing. Each bushing has symmetrically distributed connecting parts 311 on both sides. Correspondingly, the tensioning mechanism 40 adopts a modular design, including multiple independent driving components 42 and multiple independent lifting components 41. During assembly, multiple lifting components 41 are connected to the connecting parts 311 of the corresponding bushings, ensuring uniform force on both sides of the bearing; each lifting component 41 is connected to an independent driving component 42, forming a one-to-one driving relationship. This allows each driving component 42 to independently control the displacement of the corresponding driven wheel 30 in the first direction (vertical direction): when the driving component 42 starts, it pushes the lifting component 41 upwards in the first direction, causing the driven wheel 30 to move synchronously through the bushing, increasing the distance between the driving wheel 20 and the driven wheel 30, and generating tension force on the saw blade due to elastic deformation; conversely, when the driving component 42 drives the lifting component 41 downwards, the saw blade relaxes.

[0056] In this way, the tension of each saw blade can be independently adjusted through multiple independent tensioning mechanisms 40, meeting the differentiated needs under complex working conditions. For example, when multiple saw blades are cutting materials of different thicknesses in a coordinated manner, the tension can be dynamically adjusted according to the load characteristics of each saw blade, avoiding saw blade breakage or reduced cutting accuracy due to uneven tension. At the same time, the modular design also significantly improves the system's maintenance convenience. When a set of tensioning mechanisms 40 malfunctions, it can be disassembled and repaired individually without affecting the normal operation of other saw blades.

[0057] Preferably, in this embodiment, the connecting portion 311 includes a raised ring 3111, the inner diameter of which is smaller than the inner diameter of the bushing. Thus, when the connecting end of the lifting member 41 (e.g., a pin) is inserted into the raised ring 3111, the smaller inner diameter guides the pin to its position, reducing assembly deviations and facilitating the installation and positioning of the lifting member 41 and the connecting portion 311.

[0058] More specifically, in this embodiment, a through hole 413 is provided on the lifting member 41 so that the connecting part 311 passes through the through hole 413 into the lifting member 41, facilitating the connection between the connecting part 311 and the lifting member 41. At the same time, since the through hole 413 is a square hole, a rigid circumferential constraint is formed by the cooperation between the square hole and the protruding ring 3111 on the connecting part 311. Therefore, when the driving member 42 pushes the lifting member 41 to move, the square hole can restrict the rotational freedom of the connecting part 311, so that the driven wheel 30 only moves in the vertical direction (first direction), avoiding saw blade swaying due to circumferential rotation.

[0059] It should be noted that the through hole 413 in this embodiment can be a rectangular hole or a square hole, etc.

[0060] Furthermore, the bushing is provided with a through cavity 3112, which passes through the bushing and the connecting part 311, and the drive shaft 11 passes through the through cavity 3112; the cross-section of the drive shaft 11 is square, and the cross-section of the through cavity 3112 is also square.

[0061] Specifically, during assembly, both the drive shaft 11 and the through-hole 3112 have square cross-sections (such as rectangles or squares), matching in shape and size. When the drive shaft 11 passes through the through-hole 3112, the square cross-section of the drive shaft 11 directly fits against the four sides of the through-hole 3112. Utilizing the geometric characteristic of parallel opposite sides of a square shaft, a circumferential rigid constraint is formed, preventing the drive shaft 11 from rotating around its own axis within the through-hole 3112 (unlike the traditional structure of a circular shaft that relies on a keyway for anti-rotation). Thus, by matching the cross-sectional shapes, auxiliary anti-rotation parts such as keyways and splines are eliminated, simplifying the assembly process while improving the torque transmission efficiency and circumferential positioning accuracy of the transmission system.

[0062] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A band saw with a tensioning assembly, characterized in that, include: frame; A saw wheel mechanism includes a drive wheel, a driven wheel, and a saw blade; the drive wheel is spaced apart from the driven wheel in a first direction; the drive wheel is rotatably connected to the frame via a first transmission shaft, and the driven wheel is connected to the frame via a second transmission shaft; one end of the saw blade is sleeved on the drive wheel, and the other end of the saw blade is sleeved on the driven wheel, so that the driven wheel rotates synchronously with the drive wheel; The first drive shaft and the second drive shaft extend along a second direction respectively; a bushing is provided on the second drive shaft, the bushing is movable along a first direction, and the driven wheel is rotatably fitted onto the bushing; a connecting part is provided on the bushing, the connecting part protruding from the end face of the driven wheel along the second direction; The tensioning mechanism includes a lifting member and a driving member. The lifting member is connected to the connecting part. The driving member is used to drive the lifting member to move along a first direction. When the lifting member moves along the first direction, it lifts the connecting part.

2. The band saw with a tensioning assembly as described in claim 1, characterized in that, Both sides of the bushing are provided with connecting parts. The lifting member includes two lifting plates and a connecting plate. The two lifting plates extend along the first direction and are symmetrically distributed on both sides of the drive wheel. One end of each of the two lifting plates is connected to the two connecting parts, and the other end of each of the two lifting plates is connected via the connecting plate. The drive member is connected to the connecting plate.

3. The band saw with a tensioning assembly as described in claim 2, characterized in that, The driving component includes a driving cylinder and a piston rod. The piston rod is connected to the connecting plate along the first direction, and the driving cylinder is used to drive the piston rod to move along the first direction.

4. The band saw with a tensioning assembly as described in claim 1, characterized in that, It also includes a support base, which is located between the driving wheel and the driven wheel and extends along the second direction, and the tensioning mechanism is mounted on the support base.

5. The band saw with a tensioning assembly as described in claim 4, characterized in that, The support base has connecting arms at both ends, which extend along the first direction and are connected to both ends of the drive shaft.

6. The band saw with a tensioning assembly as described in claim 4, characterized in that, The support base is provided with a mounting groove, and the driving component is installed in the mounting groove.

7. The band saw with a tensioning assembly as described in any one of claims 1-6, characterized in that, Multiple driving wheels and multiple driven wheels are provided. The multiple driving wheels are spaced apart in the second direction, and the multiple driven wheels are provided in one-to-one correspondence with the multiple driving wheels. Multiple bushings are provided on the second transmission shaft, and the multiple bushings are respectively connected to the multiple driven wheels. Each bushing is provided with a connecting part, and the tensioning mechanism is provided in multiple sets.

8. The band saw with a tensioning assembly as described in any one of claims 1-6, characterized in that, The connecting part includes a raised ring, the inner diameter of which is smaller than the inner diameter of the bushing.

9. The band saw with a tensioning assembly as described in claim 8, characterized in that, The bushing is provided with a through cavity, which passes through the bushing and the connecting part, and the drive shaft passes through the through cavity; the cross-section of the drive shaft is square, and the cross-section of the through cavity is square.

10. The band saw with a tensioning assembly as described in claim 9, characterized in that, The lifting member is provided with a through hole, and the connecting part passes through the through hole, which is a square hole.

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