A metal band saw machine

Abstract

This invention belongs to the technical field of band saws, specifically relating to a metal band saw. It includes a worktable and a hydraulic lifting rod fixedly mounted on the worktable. A saw frame is fixedly mounted on the hydraulic lifting rod. The saw frame has a driving wheel and a driven wheel, with a saw band positioned between them. A sliding component is slidably mounted on the saw frame, and an arc-shaped plate connects the saw frame and the sliding component. A guide component is mounted on the arc-shaped plate. For adjusting the saw band tension, an adjustment mechanism works in conjunction with a shaft frame. The position of the driven wheel is adjusted via a handwheel and a lead screw to ensure the saw band maintains appropriate tension. Regarding the adjustment of the cutting angle, a rotating mechanism is linked to an arc-shaped rack. After adjusting the handwheel position, the handwheel drives the various components, allowing the sliding component to move flexibly. A worm gear self-locking mechanism ensures the sliding frame's position is fixed. Furthermore, the arc-shaped plate deflects with the sliding frame, ensuring the guide component always clamps the saw band, guaranteeing stable cutting.

Description

Technical Field

[0001] This invention belongs to the field of band saw technology, and specifically relates to a metal band saw. Background Technology

[0002] A metal band saw is a machine tool that uses a metal band saw blade as a cutting tool to cut various metal materials. During operation, the metal band saw blade moves continuously around two saw wheels to cut the metal workpiece fixed on the worktable.

[0003] Currently, band saws generally only allow horizontal cutting. While horizontal cutting is simple to operate, it has significant drawbacks in practical applications: First, the saw blade experiences concentrated instantaneous load, which can easily lead to tooth breakage, fracture, or rapid wear due to impact, shortening consumable life and potentially damaging the equipment's transmission system. Second, the initial cutting resistance is high, resulting in high energy consumption and frequent slippage or overload shutdowns, reducing efficiency. Although some models are designed for inclined cutting, the cutting angle is fixed and cannot be adjusted according to material characteristics (small angle for soft metals, large angle for hard metals). Therefore, a metal band saw is proposed. Summary of the Invention

[0004] The purpose of this invention is to provide a metal band saw with an adjustable cutting angle in order to solve the above-mentioned problems.

[0005] The present invention achieves the above objectives through the following technical solutions:

[0006] A metal band saw includes a worktable and a hydraulic lifting rod fixedly mounted on the worktable. A saw frame is fixedly mounted on the hydraulic lifting rod. A drive wheel and a driven wheel are mounted on the saw frame. A saw band is disposed between the drive wheel and the driven wheel. A sliding member is slidably mounted on the saw frame. An arc-shaped plate is connected between the saw frame and the sliding member. A guide member is disposed on the arc-shaped plate.

[0007] It also includes:

[0008] A shaft bracket, which is slidably mounted on a sliding member, and a driven wheel is mounted on the shaft bracket;

[0009] An arc-shaped rack is fixedly mounted on the saw frame;

[0010] A rotating mechanism is provided on the sliding member, and the rotating mechanism cooperates with the arc-shaped rack to limit the position of the sliding member;

[0011] An adjustment mechanism is provided, which is mounted on the sliding member. The position of the sliding member is adjusted by cooperating with the rotation mechanism, and the position of the shaft bracket is adjusted by the adjustment mechanism.

[0012] As a further optimization of the present invention, a connecting plate A and a connecting plate B are fixedly provided at both ends of the saw frame, the arc-shaped rack is fixedly provided on the connecting plate B, the connecting plate B is provided with an avoidance groove, and the connecting plate B is provided with multiple arc-shaped grooves.

[0013] As a further optimization of the present invention, the sliding member includes a sliding frame, on which limit plates are symmetrically arranged. The shaft frame is slidably arranged on the sliding frame through the limit plates. A horizontal shaft A is rotatably arranged on the sliding frame, and a horizontal shaft B is rotatably arranged on the sliding frame. The horizontal shaft A and the horizontal shaft B respectively slide through an arc-shaped groove. Rollers are provided on both the horizontal shaft A and the horizontal shaft B. Wheel grooves are provided on both sides of the arc-shaped groove, and the rollers are rotatably arranged in the wheel grooves. An extension frame is provided on the sliding frame.

[0014] As a further optimization of the present invention, a driven shaft is rotatably mounted on the shaft frame, a driven wheel is fixedly mounted on the driven shaft, a lead screw is rotatably mounted on the sliding frame, the lead screw is threadedly connected to the shaft frame, and the driven shaft passes through the connecting plate B through an avoidance groove.

[0015] As a further optimization of the present invention, the rotating mechanism includes a worm gear, which is rotatably mounted on a sliding frame. A worm wheel is fixedly mounted on the horizontal shaft A, and the worm gear meshes with the worm wheel. An adjusting gear is fixedly mounted on the horizontal shaft A, and the adjusting gear meshes with an arc-shaped rack.

[0016] As a further optimization of the present invention, the sliding frame is rotatably provided with a connecting shaft via an extension frame, and bevel gear A and bevel gear B are respectively provided on the connecting shaft and the worm gear, the bevel gear A and bevel gear B meshing with each other, and the worm gear is driven by the adjustment mechanism through the connecting shaft.

[0017] As a further optimization of the present invention, the adjusting mechanism includes a handwheel, which is slidably mounted on a lead screw. A sleeve is rotatably mounted on the lead screw. Synchronous pulleys are provided on both the sleeve and the connecting shaft. A synchronous belt is provided between the synchronous pulleys. Restricting gears are provided on both the lead screw and the sleeve. The restricting gears are located at both ends of the handwheel. Internal gear rings are provided at both ends of the handwheel. The internal gear rings are movably connected to the restricting gears.

[0018] As a further optimization of the present invention, a mounting base is fixedly provided on the connecting plate A, a drive shaft is rotatably provided through the mounting base, a servo motor is fixedly provided on the mounting base, a reduction gearbox is provided at the output end of the servo motor, the reduction gearbox is connected to the drive shaft, and the drive wheel is fixedly provided on the drive shaft.

[0019] As a further optimization of the present invention, one end of the bow-shaped plate is rotatably mounted on the drive shaft, and the other end of the bow-shaped plate is rotatably mounted on the horizontal axis A.

[0020] As a further optimization of the present invention, a mounting plate is fixedly provided on the bow-shaped plate, a slide rail is provided on the mounting plate, two sliding rods are slidably provided on the slide rail, a guide member is provided on the sliding rods, and the guide member is clamped on the saw blade.

[0021] The beneficial effects of this invention are as follows:

[0022] Unlike existing technologies, in actual use, the saw band tension adjustment mechanism works in conjunction with the shaft frame. The driven wheel position is adjusted via a handwheel and lead screw to ensure the saw band maintains proper tension. For the cutter angle adjustment, the rotating mechanism is linked to the arc-shaped rack. After adjusting the handwheel position, the handwheel drives each component, allowing the sliding parts to move flexibly. The worm gear self-locking ensures the sliding frame position is fixed. Furthermore, the bow-shaped plate follows the sliding frame, causing an angle deflection that ensures the guide component always clamps the saw band, keeping it perpendicular and guaranteeing stable cutting. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is the present invention. Figure 1 Another perspective structural diagram;

[0025] Figure 3 This is a schematic diagram of the exploded structure of the saw frame of the present invention;

[0026] Figure 4 This is the present invention. Figure 3 Enlarged structural diagram at point A in the middle;

[0027] Figure 5 This is the present invention. Figure 3 Another perspective structural diagram;

[0028] Figure 6 This is a schematic diagram of the sliding component connection structure of the present invention;

[0029] Figure 7 This is the present invention. Figure 6 Another perspective structural diagram;

[0030] Figure 8 This is a schematic diagram of the handwheel structure of the present invention;

[0031] Figure 9 This is a schematic diagram of the bow-shaped plate connection structure of the present invention.

[0032] In the diagram: 1. Workbench; 2. Saw frame; 21. Connecting plate A; 22. Connecting plate B; 221. Clearance groove; 222. Arc groove; 3. Hydraulic lifting rod; 4. Saw blade; 41. Drive wheel; 42. Driven wheel; 5. Sliding component; 51. Sliding frame; 511. Extension frame; 52. Limiting plate; 53. Horizontal shaft A; 54. Roller; 541. Horizontal shaft B; 542. Wheel groove; 6. Shaft frame; 61. Driven shaft; 62. Lead screw; 7. Rotating mechanism; 71. Worm gear; 72. Worm wheel; 73. Adjusting gear; 8. Connecting shaft; 81, bevel gear A; 811, bevel gear B; 9, adjusting mechanism; 91, handwheel; 911, internal gear ring; 92, sleeve; 93, limiting gear; 94, synchronous belt; 941, synchronous pulley; 10, arc rack; 11, bow plate; 12, mounting plate; 121, slide rail; 13, guide component; 131, sliding rod; 14, mounting base; 141, drive shaft; 15, servo motor; 151, gearbox; 16, fixture table; 161, fixture base; 162, fixed clamping plate; 163, moving clamping plate. Detailed Implementation

[0033] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0034] Example 1: As Figure 1 - Figure 9A metal band saw is shown, comprising a worktable 1 and a hydraulic lifting rod 3 fixedly mounted on the worktable 1. A clamping table 16 is provided on the worktable 1, and the clamping table 16 includes a clamping seat 161. A fixed clamping plate 162 is fixedly mounted on a clamping base 161, and a movable clamping plate 163 is mounted on the clamping base 161 via a lead screw and handwheel. A saw frame 2 is fixedly mounted on a hydraulic lifting rod 3, and the saw frame 2 is perpendicular to the worktable 1. The saw frame 2 is equipped with a drive wheel 41 and a driven wheel 42, and a saw band 4 is positioned between the drive wheel 41 and the driven wheel 42. A sliding member 5 is slidably mounted on the saw frame 2, and a rigid bow-shaped plate 11 connects the saw frame 2 and the sliding member 5. The bow-shaped structure of the bow-shaped plate 11 ensures that the clamping base does not obstruct the movement path of the bow-shaped plate 11 when it descends with the saw frame 2. A guide member 13 is mounted on the bow-shaped plate 11, and a mounting plate 12 is fixedly mounted on the bow-shaped plate 11. A slide rail 121 is slidably mounted on the slide rail 121. Two sliding rods 131 are provided, and guide members 13 are mounted on the sliding rods 131. The guide members 13 are clamped onto the saw blade 4. The worktable 1 provides stable support for the overall structure. The hydraulic lifting rod 3 can precisely control the lifting height of the saw frame 2, which is convenient to adapt to the cutting needs of profiles of different thicknesses. The drive wheel 41 and the driven wheel 42 work together to drive the saw blade 4 to rotate, forming a cutting power source. The sliding connection design between the sliding member 5 and the saw frame 2 provides a movable basis for subsequent angle adjustment. The bow plate 11 connects the saw frame 2 and the sliding member 5. The rigid structure of the bow plate 11 allows it to deflect at an angle as the sliding member 5 moves, keeping the guide member 13 in a stable position. The guide member 13 slides on the slide rail 121 through the sliding rods 131, which can flexibly adjust the clamping position of the saw blade 4 to ensure that the saw blade 4 remains vertical during the cutting process and improves the cutting accuracy.

[0035] An arc-shaped rack 10 is fixedly mounted on the saw frame 2. Connecting plates A21 and B22 are fixedly mounted at both ends of the saw frame 2, respectively. The arc-shaped rack 10 is fixedly mounted on the connecting plate B22, which has a clearance groove 221 and two arc-shaped grooves 222. A mounting base 14 is fixedly mounted on the connecting plate A21, and a drive shaft 141 is rotatably mounted through the mounting base 14. A servo motor 15 is fixedly mounted on the mounting base 14, and a reduction gearbox 151 is mounted at the output end of the servo motor 15. The reduction gearbox 151 is connected to the drive shaft 141. The drive wheel 41... Fixedly mounted on the drive shaft 141, the arc-shaped rack 10 and arc-shaped groove 222 are both arc-shaped structures with the drive shaft 141 as the center. One end of the bow-shaped plate 11 is rotatably mounted on the drive shaft 141. The connecting plate A21 and connecting plate B22 serve as the two end support structures of the saw frame 2, enhancing the overall frame strength. The servo motor 15 drives the drive wheel 41 through the drive shaft 141, providing stable power output, and the servo control can precisely adjust the speed. The drive shaft 141 provides a rotation fulcrum for the bow-shaped plate 11, allowing the bow-shaped plate 11 to deflect around the axis of the drive shaft 141, realizing the angle following of the guide member 13.

[0036] The sliding component 5 includes a sliding frame 51, on which limit plates 52 are symmetrically arranged. The shaft frame 6 is slidably mounted on the sliding frame 51 via the limit plates 52. A horizontal shaft A53 and a horizontal shaft B541 are rotatably mounted on the sliding frame 51. The horizontal shafts A53 and B541 slide through the arc-shaped groove 222 respectively. Rollers 54 are provided on both the horizontal shafts A53 and B541. Wheel grooves 542 are provided on both sides of the arc-shaped groove 222, and the rollers 54 roll in the wheel grooves 542. An extension frame 511 is provided on the sliding frame 51, and a connecting shaft 8 is rotatably mounted on the sliding frame 511 via the extension frame 511. The other end of the bow-shaped plate 11 is rotatably mounted on the horizontal shaft A53. The sliding frame 51 serves as the main structure of the sliding component 5, supporting the shaft frame 6 and the transmission components. The limit plates 52 restrict the sliding direction of the shaft frame 6. To prevent deviation, the horizontal shafts A53 and B541 cooperate with the arc-shaped groove 222 to limit the movement of the sliding frame 51 to rotation along an arc-shaped trajectory, thereby adjusting the cutting angle. The rolling connection design between the roller 54 and the wheel groove 542 converts sliding friction into rolling friction, reducing movement resistance and improving adjustment smoothness. At the same time, the wheel groove restricts the movement of the sliding frame 51 to both sides, making the sliding frame 51 more stable. The extension frame 511 extends the installation space of the sliding frame 51, facilitating the arrangement of the connecting shaft 8. The two ends of the bow-shaped plate 11 are rotatably connected to the horizontal shaft A53 and the drive shaft 141, respectively. Since the arc-shaped rack 10 and the arc-shaped groove 222 are both arc-shaped with the drive shaft 141 as the center, the sliding frame 51 deflects with the drive shaft 141 as the center, ensuring that the guide 13 deflects synchronously with the sliding frame 51 and maintaining the perpendicularity of the saw blade 4.

[0037] A driven shaft 61 is rotatably mounted on the shaft bracket 6, and a driven wheel 42 is fixedly mounted on the driven shaft 61. A lead screw 62 is rotatably mounted on the sliding frame 51, and the lead screw 62 is threadedly connected to the shaft bracket 6. The driven shaft 61 passes through the connecting plate B22 through the clearance groove 221. The shaft bracket 6 provides a mounting carrier for the driven wheel 42. The position of the driven wheel 42 is adjusted by sliding it on the sliding member 5, thereby realizing the tension adjustment of the saw band 4. The driven shaft 61 supports the driven wheel 42 and transmits the rotational motion. The threaded connection between the lead screw 62 and the shaft bracket 6 forms a helical drive, which converts the rotational motion of the lead screw 62 into the linear motion of the shaft bracket 6, which has the advantages of compact structure and high adjustment accuracy. The clearance groove 221 provides a channel for the driven shaft 61 to pass through the connecting plate B22, ensuring the feasibility of adjusting the position of the driven wheel 42.

[0038] A rotating mechanism 7 is provided on the sliding member 5. The rotating mechanism 7 cooperates with the arc-shaped rack 10 to limit the position of the sliding member 5. The rotating mechanism 7 includes a worm 71, which is rotatably mounted on the sliding frame 51. A worm wheel 72 is fixedly mounted on the horizontal shaft A53. The worm 71 and the worm wheel 72 mesh. An adjusting gear 73 is fixedly mounted on the horizontal shaft A53. The adjusting gear 73 meshes with the arc-shaped rack 10. The arc-shaped rack 10 provides a meshing track for the adjusting gear 73. A bevel gear A81 and a bevel gear B811 are respectively provided on the connecting shaft 8 and the worm 71. The bevel gear A81 and the bevel gear B811 mesh with each other. The self-locking characteristic of the worm 71 and the worm wheel 72 can prevent the sliding member 5 from shifting on its own due to force during the cutting process, ensuring the stability of the cutting angle. The meshing transmission between the adjusting gear 73 and the arc-shaped rack 10 converts the rotational motion into movement along the arc trajectory, accurately controlling the deflection angle of the sliding member 5.

[0039] An adjustment mechanism 9 is provided on the sliding member 5. The position of the sliding member 5 is adjusted by cooperating with the rotation mechanism 7 through the adjustment mechanism 9, and the position of the shaft bracket 6 is also adjusted through the adjustment mechanism 9. The adjustment mechanism 9 includes a handwheel 91, which is slidably mounted on the lead screw 62. A sleeve 92 is rotatably mounted on the lead screw 62. Both the sleeve 92 and the connecting shaft 8 are provided with synchronous pulleys 941 to realize power transmission. A synchronous belt 94 is provided between the synchronous pulleys 941. Both the lead screw 62 and the sleeve 92 are provided with limiting gears 93, which are located at both ends of the handwheel 91. Both ends of the handwheel 91 are provided with internal gear rings 911, which are movably connected to the limiting gears 93. The adjustment mechanism 9 realizes the adjustment of the saw band tension 4 and the cutting direction through the sliding switching function of the handwheel 91. The angle adjustment function allows for switching between two adjustment needs with a single mechanism, simplifying the operation process and optimizing the operating space. Simultaneously, adjusting one function effectively prevents accidental operation of the other, thus avoiding the need for readjustment. The meshing design of the internal gear ring 911 of the handwheel 91 and the limiting gear 93 ensures reliable power transmission and prevents idle rotation. The rotational connection between the lead screw 62 and the sleeve 92 ensures that the handwheel 91 does not drive the lead screw 62 to rotate when adjusting the angle, guaranteeing that the two adjustment functions do not interfere with each other. The transmission structure of the synchronous pulley 941 and the synchronous belt 94 stably transmits torque, ensuring that the connecting shaft 8 and the sleeve 92 rotate synchronously, improving the consistency and accuracy of angle adjustment. The connecting shaft 8, as the transmission hub, transmits the rotational motion of the handwheel 91 to the worm gear 71.

[0040] It should be noted that the working principle of the metal band saw is as follows: when the metal band saw is working, the servo motor 15 drives the drive shaft 141 to rotate, the drive shaft 141 drives the drive wheel 41 to rotate, thereby driving the saw band 4 to rotate. The profile is clamped by the clamping parts on the worktable 1, and the hydraulic lifting rod 3 drives the saw frame 2 to descend so as to cut the profile.

[0041] Before use, when it is necessary to adjust the tension of the saw band 4, slide the handwheel 91 and put the internal gear ring 911 on the handwheel 91 onto the limiting gear 93 on the lead screw 62. Rotate the handwheel 91 to drive the lead screw 62 to rotate. Since the lead screw 62 is threadedly connected to the shaft frame 6, the position of the shaft frame 6 on the sliding part 5 is adjusted, and the position of the driven wheel 42 is changed to achieve the adjustment of the tension of the saw band 4.

[0042] When the cutting angle needs to be adjusted, slide the handwheel 91 again to mount the other internal gear ring 911 on the handwheel 91 onto the limiting gear 93 on the sleeve 92. Rotate the handwheel 91, and the sleeve 92 will drive the connecting shaft 8 to rotate through the synchronous wheel 941 and the synchronous belt 94. The bevel gear A81 on the connecting shaft 8 and the bevel gear B811 on the worm 71 will mesh with each other, driving the worm 71 to rotate. The worm 71 will mesh with the worm wheel 72 on the horizontal shaft A53, causing the horizontal shaft A53 to rotate. The adjusting gear 73 on the horizontal shaft A53 will mesh with the arc rack 10, and the adjusting gear 73 will move on the arc rack 10, driving the sliding member 5 to move. At the same time, the self-locking of the worm 71 and the worm wheel 72 will be used to fix the position of the sliding frame 51. During the movement of the sliding frame 51, the roller 54 moves in the wheel groove 542 to ensure the stability of the sliding frame 51. The bow plate 11 moves with the sliding frame 51, causing the bow plate 11 to deflect around the drive shaft 141. This ensures that the guide 13 connected to the bow plate 11 clamps the saw blade 4 at all times, ensuring the perpendicularity of the saw blade 4.

[0043] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A metal band saw, comprising a worktable (1) and a hydraulic lifting rod (3) fixedly mounted on the worktable (1), wherein a saw frame (2) is fixedly mounted on the hydraulic lifting rod (3), and a drive wheel (41) and a driven wheel (42) are mounted on the saw frame (2), and a saw band (4) is disposed between the drive wheel (41) and the driven wheel (42), characterized in that: A sliding member (5) is slidably disposed on the saw frame (2), and an arc-shaped plate (11) is connected between the saw frame (2) and the sliding member (5). A guide member (13) is disposed on the arc-shaped plate (11). It also includes: A shaft bracket (6) is slidably mounted on a sliding member (5), and a driven wheel (42) is mounted on the shaft bracket (6). Arc-shaped rack (10), the arc-shaped rack (10) is fixedly mounted on the saw frame (2); Rotating mechanism (7), which is mounted on the sliding member (5), and the position of the sliding member (5) is restricted by the cooperation of the rotating mechanism (7) with the arc rack (10); Adjustment mechanism (9) and connecting shaft (8), the adjustment mechanism (9) is set on the sliding member (5), the position of the sliding member (5) is adjusted by the adjustment mechanism (9) in cooperation with the rotation mechanism (7), and the position of the shaft frame (6) is adjusted by the adjustment mechanism (9); The rotating mechanism (7) includes a worm (71), a worm wheel (72) and an adjusting gear (73). The worm (71) meshes with the worm wheel (72), and the adjusting gear (73) meshes with the arc-shaped rack (10). The adjusting mechanism (9) includes a handwheel (91), a sleeve (92) and two limiting gears (93). Both the sleeve (92) and the connecting shaft (8) are provided with synchronous pulleys (941). A synchronous belt (94) is provided between the synchronous pulleys (941). The limiting gears (93) are located at both ends of the handwheel (91). Both ends of the handwheel (91) are provided with internal gear rings (911). The internal gear rings (911) are movably connected to the limiting gears (93).

2. The metal band saw according to claim 1, characterized in that: The saw frame (2) is fixedly provided with connecting plate A (21) and connecting plate B (22) at both ends respectively. The arc-shaped rack (10) is fixedly provided on the connecting plate B (22). The connecting plate B (22) is provided with a clearance groove (221) and multiple arc-shaped grooves (222).

3. A metal band saw according to claim 2, characterized in that: The sliding component (5) includes a sliding frame (51), the worm gear (71) is rotatably mounted on the sliding frame (51), the sliding frame (51) is symmetrically provided with a limiting plate (52), the shaft frame (6) is slidably mounted on the sliding frame (51) through the limiting plate (52), the sliding frame (51) is rotatably provided with a horizontal shaft A (53), the worm gear (72) and the adjusting gear (73) are fixedly mounted on the horizontal shaft A (53), the sliding frame (51) is rotatably provided with a horizontal shaft B (541), the horizontal shaft A (53) and the horizontal shaft B (541) respectively slide through the arc groove (222), the horizontal shaft A (53) and the horizontal shaft B (541) are both provided with rollers (54), the arc groove (222) is provided with wheel grooves (542) on both sides, the rollers (54) are rotatably mounted in the wheel grooves (542), and the sliding frame (51) is provided with an extension frame (511).

4. A metal band saw according to claim 3, characterized in that: A driven shaft (61) is rotatably mounted on the shaft frame (6), a driven wheel (42) is fixedly mounted on the driven shaft (61), a lead screw (62) is rotatably mounted on the sliding frame (51), a sleeve (92) is rotatably mounted on the lead screw (62), a handwheel (91) is slidably mounted on the lead screw (62), a limiting gear (93) is respectively mounted on the lead screw (62) and the sleeve (92), the lead screw (62) is threadedly connected to the shaft frame (6), and the driven shaft (61) passes through the connecting plate B (22) through the clearance groove (221).

5. A metal band saw according to claim 4, characterized in that: The connecting shaft (8) is rotatably mounted on the sliding frame (51) via the extension frame (511). The connecting shaft (8) and the worm (71) are respectively provided with bevel gear A (81) and bevel gear B (811). The bevel gear A (81) and bevel gear B (811) mesh with each other. The worm (71) is driven by the adjusting mechanism (9) via the connecting shaft (8).

6. A metal band saw according to claim 3, characterized in that: A mounting base (14) is fixedly installed on the connecting plate A (21). A drive shaft (141) is rotatably installed through the mounting base (14). A servo motor (15) is fixedly installed on the mounting base (14). A reduction gearbox (151) is installed at the output end of the servo motor (15). The reduction gearbox (151) is connected to the drive shaft (141). The drive wheel (41) is fixedly installed on the drive shaft (141).

7. A metal band saw according to claim 6, characterized in that: One end of the bow-shaped plate (11) is rotatably mounted on the drive shaft (141), and the other end of the bow-shaped plate (11) is rotatably mounted on the horizontal shaft A (53).

8. A metal band saw according to claim 1, characterized in that: An mounting plate (12) is fixedly installed on the bow-shaped plate (11). A slide rail (121) is installed on the mounting plate (12). Two sliding rods (131) are slidably installed on the slide rail (121). A guide (13) is installed on the sliding rod (131) and clamped on the saw blade (4).

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