Screw cutting machine capable of conveniently cutting different screws

Abstract

The utility model discloses a screw cutting machine convenient to cut different screws, the screw cutting machine is provided with a cam and a shearing arm with a roller, the cam is provided with an involute surface, and when the involute surface is matched with the roller, the shearing arm is driven to swing, and a movable cutter and a fixed cutter are driven to be matched to shear the screws. The screw cutting machine is further provided with a screw supporting base for supporting the screw on one side of the fixed cutter, the screw supporting base comprises a base body and a rotating piece rotationally connected to the base body, and at least two screw supporting grooves are evenly distributed in the rotating piece around the rotating center. And the at least two screw supporting grooves have a height difference, so that one of the screw supporting grooves is selected to support the screw of the corresponding specification through rotation of the rotating piece. According to the utility model, the proper screw rod supporting grooves can be conveniently switched to support the screw rods with corresponding specifications.

Description

Technical Field

[0001] The utility model relates to the technical field of cutting processing, in particular to a screw cutting machine which is convenient for cutting different screws. Background Art

[0002] A common screw shearing machine includes a shearing seat, a fixed blade fixed to the shearing seat, a shearing arm, and a movable blade fixed to the shearing arm. The movable blade and the fixed blade cooperate to shear the screw. The shearing process is achieved by the blades of the movable blade and the fixed blade cooperating to shear the end face of the screw. In addition, the screw cutting machine is also provided with a screw support seat on one side of the fixed blade to support the screw. During the shearing process, the screw is placed on the screw support seat to ensure that the screw remains stable during the shearing process and ensure the shearing effect. When shearing screws of different specifications, it is necessary to remove the screw and replace it with a different screw support seat, which is inconvenient to operate. Utility Model Content

[0003] The utility model aims to provide a screw cutting machine which is convenient for cutting different screws, so as to solve the problem in the prior art that when cutting screws of different specifications, the screws need to be removed and replaced with different screw support seats, which is inconvenient to operate.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a screw cutting machine that is convenient for cutting different screws, including a shearing assembly and a driving assembly, the shearing assembly including a shearing seat, a fixed knife fixed to the shearing seat, a shearing arm hinged to the shearing seat, a movable knife fixed to the shearing arm, a reset spring connected to the shearing arm, a cam rotatably connected to the shearing seat, and a roller rotatably connected to the shearing arm, the driving assembly including a motor and a reducer that drives the cam to rotate, the cam is provided with an involute surface, when the involute surface cooperates with the roller, the shearing arm is driven to swing, and the movable knife and the fixed knife are driven to cooperate to shear the screw, the screw cutting machine is also provided with a screw supporting seat for supporting the screw on one side of the fixed knife, the screw supporting seat includes a seat body and a rotating member rotatably connected to the seat body, the rotating member is evenly distributed with at least two screw supporting grooves around the rotation center, and one of the screw supporting grooves is selected to support a screw of corresponding specifications through the rotation of the rotating member.

[0005] After adopting the above technical solution, the utility model has the following advantages: the cam moves in a circle around the center of the circle on the shearing seat, the shearing arm swings, and a roller is provided on the shearing arm. The shearing arm swings through the action of the involute surface and the outer surface of the roller, driving the moving knife and the fixed knife to cooperate with the shearing screw. The design of the screw support seat can realize the support of screws of different specifications. By rotating the rotating part, one of the screw support grooves can be selected to support the screw of the corresponding specification, thereby realizing the flexibility and adjustability of the screw cutting machine.

[0006] Since at least two screw support grooves are provided, screws of different specifications can be supported. Placing the screw in the screw support groove can fix the position of the screw so that it remains stable during the shearing process, which helps to achieve more precise shearing. By turning the rotating part, the screw support groove with appropriate height can be smoothly switched to support the screw of corresponding specifications.

[0007] Furthermore, a middle convex portion is provided at the center of the upper portion of the rotating member, and the rotating member has a first screw support groove and a second screw support groove on opposite sides of the width of the middle convex portion. With the aforementioned technical solution, the middle convex portion is convenient for the operator to adjust. During use, the operator can pinch the middle convex portion with one hand to rotate and adjust to select a screw support groove with a suitable height, which is conducive to convenient and quick adjustment and improves cutting efficiency. For example, when the specification of the screw is large, the larger screw can be automatically dropped into the first screw support groove by rotating the rotating member to ensure the stability of the screw. There is no need to remove the screw for adjustment, which is more convenient to use. The screw cutting machine can be applied to screws of more specifications, expanding the scope of application.

[0008] Furthermore, the third screw support groove and the fourth screw support groove are respectively provided on both sides of the length of the middle convex portion. With the above technical solution, two different screw support grooves are also provided on both sides of the length of the middle convex portion, so that the screw cutting machine can adapt to more screws of different specifications, expand the scope of application of the screw cutting machine, and make it more flexible to use.

[0009] Furthermore, a rotational positioning surface is provided between the rotating member and the seat body to maintain the relative position of the rotating member and the seat body after the rotating member rotates to a set angle, so that one of the screw support grooves supports a screw of corresponding specifications. By adopting the above technical solution, the rotational positioning surface improves the positioning effect of the rotating member. Only by rotating the rotating member to a set angle, the rotational positioning surface will automatically lock the position of the rotating member, so that the relative position of the rotating member and the seat body remains unchanged, providing more stable support for the screw, and allowing the operator to switch the screw support groove more quickly and conveniently.

[0010] Furthermore, a center hole and a center shaft for movable fit are provided between the rotating member and the base, and a spring is provided between the rotating member and the base. With the aforementioned technical solution, the center shaft is conducive to the free rotation of the rotating member, making the rotating member rotate more smoothly, and the screw support groove can quickly support a screw of corresponding specifications. The pressing spring facilitates the rotation and adjustment of the rotating member. The height of the rotating member can be controlled by controlling the force of pressing the rotating member, so that the screw support groove supports a screw of corresponding specifications, making the adjustment operation simpler. The spring can increase the locking force, reduce the impact and vibration of the screw support groove during the shearing process, and ensure that the relative position of the rotating member and the base remains unchanged after the rotating member rotates to the set angle, reducing the wear on the screw support groove, thereby extending the service life of the cutting machine.

[0011] Furthermore, the spring sleeve is mounted on the central rotating shaft to provide support for the spring, reduce spring shaking, and help ensure the stability of the screw support groove.

[0012] Alternatively, at least two springs are evenly distributed around the central rotating shaft. With the above technical solution, the springs are evenly distributed around the central rotating shaft, which can support the screw more evenly, and the rotating part is better supported and buffered. When the screw is placed on the screw support groove and the rotating part is subjected to lateral force, multiple springs can provide better support and locking force, reduce the poor cutting effect caused by unbalanced force, more evenly disperse the force on the spring, avoid damage caused by excessive load on a single spring, and help extend the service life of the spring, thereby extending the overall service life of the screw cutting machine.

[0013] Furthermore, the bottom walls of the first screw support groove, the second screw support groove, the third screw support groove and the fourth screw support groove are inclined surfaces or curved surfaces that descend downward toward the center. With the aforementioned technical solution, the inclined surface can guide the screw to move toward the center, reduce the shaking of the screw during the shearing process, and stably fix the screw in the screw support groove, which is conducive to achieving more precise shearing operations. The inclined surface can also automatically adjust the height of the screw support groove to accommodate screws of different specifications. The curved surface has a better fit with the screw, reduces the shaking of the screw, and is conducive to achieving more precise shearing operations.

[0014] Furthermore, the first screw support groove and the second screw support groove are connected to the middle convex part with an arc concave surface. With the above technical solution, the arc concave surface has a guiding function, which can guide the screw to move toward the center and limit its lateral movement, thereby reducing the error caused by screw deviation.

[0015] Furthermore, the fixed knife is a square structure, and a fixed knife threaded cutting edge is provided on each of the four sides; the movable knife is a square structure, and a movable knife threaded cutting edge is provided on each of the four sides; the four fixed knife threaded cutting edges are different in size from the four movable knife threaded cutting edges and are matched one-to-one with four screw rods of corresponding specifications. With the above-mentioned technical solution, both the fixed knife and the movable knife adopt a square structure, and a threaded cutting edge is provided on each side, so that uniform force can be ensured during the cutting process, stress concentration can be reduced, and shearing accuracy can be improved. The four fixed knife threaded cutting edges are different in size from the four movable knife threaded cutting edges, and can adapt to screw rods of different specifications to meet different shearing requirements.

[0016] Furthermore, the fixed blade and the movable blade are provided with fixing holes connected with the fastening screws. By adopting the above technical solution, the fixed blade and the movable blade can be firmly fixed on the cutting machine to prevent them from loosening during the shearing process. The fixed blade or the movable blade can be firmly fixed by simply tightening the fastening screws without additional fastening. The installation method is simple. When the fixed blade or the movable blade needs to be replaced, it is only necessary to loosen the fastening screws, replace the new fixed blade or the movable blade, and re-tighten the fastening screws, which is convenient for replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model is further described below in conjunction with the accompanying drawings:

[0018] Figure 1 This is a front and side view of a screw cutting machine for conveniently cutting different screws according to the utility model;

[0019] Figure 2 It is a schematic diagram of the exploded structure of the shearing assembly;

[0020] Figure 3 It is a structural schematic diagram of a movable knife and a fixed knife;

[0021] Figure 4 It is a structural schematic diagram of the screw support seat;

[0022] Figure 5 is a schematic structural diagram of a rotating member (I);

[0023] Figure 6 is a schematic structural diagram of a rotating member (II);

[0024] Figure 7 It is a partial enlarged view of the rotating part installed on the screw support seat;

[0025] Figure 8 This is a partial enlarged view of the interior of the screw support seat;

[0026] Fig. 9 It is a structural schematic diagram of the screw cutting machine in the shearing state;

[0027] Fig.10This is a schematic diagram of the structure of the screw cutting machine after shearing. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments.

[0029] The terms "first", "second", etc. (if any) in the specification and claims of the present utility model are used to distinguish similar objects, rather than to describe a specific order or sequence. Even if "second" is used to distinguish a certain technical feature, it does not necessarily mean that it has "first". It should be understood that in the present utility model, "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. It should be understood that in the present utility model, "multiple" refers to two or more. "And / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, X and / or Y can represent: X exists alone, X and Y exist at the same time, and Y exists alone. The character " / " generally indicates that the related objects before and after are in an "or" relationship. "Contains X, Y and Z", "Contains X, Y, Z" means that X, Y, and Z are all included, "Contains X, Y or Z" means that one of X, Y, and Z is included, and "Contains X, Y and / or Z" means that any one, any two, or three of X, Y, and Z are included.

[0030] The following specific embodiments are used to describe the technical solution of the utility model in detail. The following specific embodiments can be combined or replaced with each other according to actual conditions, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0031] like Figures 1 to 10As shown, the utility model provides a screw cutting machine for conveniently cutting different screws, including a shearing assembly and a driving assembly, the shearing assembly including a shearing seat 1, a fixed knife 2 fixed to the shearing seat 1, a shearing arm 3 hinged to the shearing seat 1, a movable knife 4 fixed to the shearing arm 3, a reset spring 5 connected to the shearing arm 3, a cam 6 rotatably connected to the shearing seat 1, and a roller 7 rotatably connected to the shearing arm 3, the driving assembly including a motor and a reducer for driving the cam 6 to rotate, the cam 6 is provided with an involute surface 61, when the involute surface 61 cooperates with the roller 7, the shearing arm 3 is driven to swing, and the movable knife 4 cooperates with the fixed knife 2 to shear the screw, the screw cutting machine is also provided with a screw supporting seat 8 for supporting the screw on one side of the fixed knife 2, the screw supporting seat 8 includes a seat body 81 and a rotating member 82 rotatably connected to the seat body 81, the rotating member 82 is evenly distributed with at least two screw supporting grooves 83 around the rotation center; through the rotation of the rotating member 82, one of the screw supporting grooves 83 is selected to support a screw of corresponding specifications.

[0032] In this embodiment, the cam 6 makes a circular motion around the center of the circle on the shear seat 1, and the shear arm 3 swings. The shear arm 3 is provided with a roller 7. The shear arm 3 is driven to swing through the action of the involute surface 61 and the outer cylindrical surface of the roller 7, thereby driving the movable knife 4 and the fixed knife 2 to cooperate with the shear screw 9.

[0033] like Figures 2 to 3 As shown, the shear seat 1 is provided with a rotation support hole 14 and an axial hole 15, a bolt 16 is fixed on the shear seat 1, and a swing support hole 31 is provided on the shear arm 3 to connect with the bolt 16. The rear end of the bolt 16 passes through the axial hole 15 on the shear seat 1 and is connected with a nut 161. The front end of the bolt 16 is provided with a limit flange 162, and the limit flange 162 is located on the front side of the shear arm 3. The front end of the bolt 16 is provided with a shaft head in front of the limit flange 162. The cam 6 is provided with a central shaft 63, and the central shaft 63 is rotatably supported in the rotation support hole 14. Of course, a bearing can also be added. It can be understood that the bolt 16 can be replaced with a pin or other similar rotating shaft.

[0034] like Figures 5 to 8 As shown, the design of the screw support seat 8 can support screws 9 of different specifications. By rotating the rotating member 82, one of the screw support grooves 83 can be selected to support the screw 9 of the corresponding specification, thereby realizing the flexibility and adjustability of the screw cutting machine.

[0035] At least two screw support grooves 83 are provided to support screws 9 of different specifications. Placing the screw 9 in the screw support groove 83 can fix the position of the screw 9 so that it remains stable during the shearing process, which helps to achieve more precise shearing. In order to support screws 9 of different specifications (diameters), the screw support groove 83 has a height difference. By rotating the rotating part 82, the screw support groove 83 with appropriate height can be smoothly switched to support the screw 9 of the corresponding specification.

[0036] The edge of the shear seat 1 is provided with a screw positioning notch 11, and the front side of the shear seat 1 is provided with a fixed knife fixing groove 12 below the screw positioning notch 11, and the fixed knife 2 is fixed to the fixed knife fixing groove 12. The rear side of the shear arm 3 is provided with a movable knife fixing groove, and the movable knife 4 is fixed to the movable knife fixing groove. The front side of the shear seat 1 is provided with a movable knife positioning surface above the screw positioning notch 11, and the fixed knife 2 installation position is ensured by the fixed knife fixing groove 12, and the movable knife 4 installation position is ensured by the movable knife fixing groove, so that when the movable knife 4 cooperates with the fixed knife 2 to complete the shearing of the screw 9, there is basically no gap between the two. The setting of the movable knife positioning surface enables the movable knife 4 to be accurately positioned above the screw cutting position, ensuring the appropriate position of the movable knife 4 and the screw, and improving the cutting accuracy and efficiency.

[0037] The existence of the screw positioning recess 11 enables the screw 9 to be accurately positioned during cutting, ensuring the accuracy of the cutting position; the screw positioning recess 11 helps to fix the screw 9 to prevent it from shaking or shifting during the cutting process, thereby improving the stability and reliability of the cutting. The design of the screw positioning recess 11 enables the screw 9 to be conveniently placed and positioned, while the setting of the fixed knife fixing groove 12 enables the fixed knife 2 to be easily fixed in a suitable position, facilitating installation and adjustment.

[0038] The above-mentioned reset spring 5 is installed on the screw cutting machine. The reset spring 5 can be a torsion spring. The screw cutting machine is provided with a spring mounting pin for mounting the reset spring 5. One leg of the reset spring 5 is supported on the shearing arm 3, and the other leg is supported on the casing of the screw cutting machine. When the movable knife 4 cooperates with the fixed knife 2 to complete the shearing of the screw 9, the cam 6 no longer drives the shearing arm 3, and under the action of the reset spring 5, the shearing arm 3 is reset.

[0039] In this embodiment, the reducer is a planetary gear reducer, which not only has the function of reducing the rotation speed and increasing the output torque of a conventional reduction mechanism, but also has higher precision. After the shearing assembly completes a shearing action, the motor needs to be stopped in time to replace the screw 9 and prepare for the next shearing. At present, this work is achieved by manually controlling the switch button. Since the shearing action of the movable knife 4 is driven by the cam 6, a complete shearing action is completed when the cam 6 rotates one circle. Directly detecting the rotation stroke of the cam 6 requires the installation of corresponding sensors, which is costly and difficult to ensure accuracy. Since there is a corresponding relationship between one rotation of the cam 6 and one rotation of the planetary gear reducer, the shutdown after completing a shearing action can be controlled by the rotation of the planetary gear reducer.

[0040] like Figure 5As shown, in order to facilitate the rotation of the rotating member 82, in one embodiment, a middle convex portion 821 is provided at the center of the upper portion of the rotating member 82, and the rotating member 82 is provided with a first screw support groove 831 and a second screw support groove 832 on both sides of the width of the middle convex portion 821. The middle convex portion 821 is convenient for the operator to adjust. During use, the operator can pinch the middle convex portion 821 with one hand to rotate and adjust to select a screw support groove 83 with a suitable height, which is conducive to convenient and quick adjustment and improves cutting efficiency. For example, when the specification of the screw 9 is large, the larger screw 9 is automatically dropped into the first screw support groove 831 by rotating the rotating member 82, so as to ensure the stability of the screw, and there is no need to remove the screw 9 for adjustment, which is more convenient to use. The screw cutting machine can be applied to screws 9 of more specifications, expanding the scope of application.

[0041] like Figure 6 As shown, in order to further expand the application scope of the screw cutter, in another embodiment, a third screw support groove 833 and a fourth screw support groove 834 are respectively provided on both sides of the length of the middle convex portion 821. Two screw support grooves 83 of different heights are also provided on both sides of the length of the middle convex portion 821, so that the screw cutter can adapt to more screws 9 of different specifications, expand the application scope of the screw cutter, and make it more flexible to use.

[0042] like Figure 7 As shown, in order to make the rotating member 82 maintain the set angle, in one embodiment, a rotation positioning surface 87 is provided between the rotating member 82 and the seat body 81 to maintain the relative position of the rotating member 82 and the seat body 81 after the rotating member 82 rotates the set angle, so that one of the screw support grooves 83 supports a screw of corresponding specifications. Among them, the rotation positioning surface 87 can be set as an inclined surface with both sides descending toward the center below. When the rotating member is rotated, the inclined surface blocks the rotation of the rotating member. The rotation positioning surface 87 improves the positioning effect of the rotating member 82. It only needs to rotate the rotating member 82 to the set angle, and the rotation positioning surface 87 will automatically lock the position of the rotating member 82, so that the relative position of the rotating member 82 and the seat body 81 remains unchanged, providing more stable support for the screw 9, and it is more convenient for the operator to switch the screw support groove 83 more quickly.

[0043] like Figure 8As shown, in one embodiment, a center hole 84 and a center shaft 85 for active cooperation are provided between the rotating member 82 and the seat body 81, and a spring is provided between the rotating member 82 and the seat body 81. The center shaft 85 is conducive to the free rotation of the rotating member 82, so that the rotating member 82 rotates more smoothly, and the screw support groove 83 can quickly support the screw 9 of corresponding specifications. The spring 86 can increase the locking force, reduce the impact and vibration of the screw support groove 83 during the shearing process, ensure that the relative position of the rotating member 82 and the seat body 81 remains unchanged after the rotating member 82 rotates to the set angle, reduce the wear of the screw support groove 83, and thus extend the service life of the cutting machine.

[0044] The spring 86 is sleeved on the central shaft 85 to provide support for the spring 86 , thereby reducing the shaking of the spring 86 and ensuring the stability of the screw support groove 83 .

[0045] Alternatively, the springs 86 may be evenly distributed around the central rotating shaft 85, and at least two springs 86 may be provided. The springs 86 are evenly distributed around the central rotating shaft 85, so that the screw rod can be supported more evenly, and the rotating member 82 is better supported and buffered. When the screw rod is placed on the screw rod support groove 83 and the rotating member 82 is subjected to lateral force, multiple springs 86 may provide better support and buffering, reduce the poor cutting effect caused by unbalanced force, and more evenly disperse the force on the springs 86, so as to avoid damage caused by excessive load on a single spring 86, and help to extend the service life of the springs 86, thereby extending the overall service life of the screw cutting machine.

[0046] In order to ensure that the screw is stably supported in the screw support groove 83, in one embodiment, the bottom walls of the first screw support groove 831, the second screw support groove 832, the third screw support groove 833 and the fourth screw support groove 834 are inclined surfaces that descend downward toward the center. The inclined surface can fit more closely with the outer side surface of the screw to better achieve stable support. The inclined surface can also guide the screw to move toward the center, reduce the shaking of the screw during the shearing process, and stably fix the screw in the screw support groove 83, which is conducive to achieving more precise shearing operations. The inclined surface can also automatically adjust the height of the screw support groove 83 to adapt to screws 9 of different specifications.

[0047] Alternatively, the bottom walls of the first screw support groove 831, the second screw support groove 832, the third screw support groove 833 and the fourth screw support groove 834 are arc surfaces descending downward toward the center, and the arc surfaces fit better with the outer side surfaces of the screws, reducing screw shaking, which is conducive to achieving better stable support and more precise shearing operations.

[0048] In one embodiment, a circular arc concave surface is provided at the junction of the first screw support groove 831 and the second screw support groove 832 with the middle convex portion 821. The circular arc concave surface fits better with the outer side surface of the screw, which is conducive to more stable support of the screw on the screw support groove.

[0049] In one embodiment, the fixed knife 2 is a square structure, and a fixed knife threaded edge 21 is provided on each of the four sides; the movable knife 4 is a square structure, and a movable knife threaded edge 41 is provided on each of the four sides; the four fixed knife threaded edges 21 and the four movable knife threaded edges 41 are different in size and are matched one by one with four screw rods 9 of corresponding specifications. The fixed knife 2 and the movable knife 4 both adopt a square structure, and a threaded edge is provided on each side, so that uniform force can be ensured during the cutting process, stress concentration can be reduced, and shearing accuracy can be improved. The four fixed knife threaded edges 21 and the four movable knife threaded edges 41 are different in size, and can adapt to screw rods 9 of different specifications to meet different shearing requirements.

[0050] like Figure 3 As shown, specifically, the four fixed knife thread edges 21 and the four movable knife thread edges 41 are all increased or decreased in sequence in the clockwise or counterclockwise direction, and the fixed knife thread edges 21 and the movable knife thread edges 41 are increased or decreased in sequence in the same direction, which can ensure the smooth cooperation between the screw cutter and the screw 9 during the cutting process and improve the cutting stability; the orderly change in the size of the fixed knife thread edges 21 and the movable knife thread edges 41 can reduce the sudden change between the screw cutter and the screw 9, so that the screw cutter can adapt to the conversion of different cutting sizes more quickly, while ensuring the consistency of the cutting trajectory.

[0051] In the prior art, the screw 9 has burrs after cutting, so in this embodiment, the fixed knife 2 and the movable knife 4 are provided with a notch 43 connected to the threaded blade on the end face of the shearing side. The threaded blade on the fixed knife 2 and the movable knife 4 cooperates with the thread on the screw 9 to prevent the screw 9 from moving axially, which can improve the accuracy and precision of cutting and reduce the possibility of burrs; further, through the design of the notch 43, the notch 43 can accommodate the chips generated when the screw 9 is sheared, which can prevent the excess chips cut off during the shearing process from remaining on the shearing side end face of the fixed knife 2 and the movable knife 4, and prevent the cut screw 9 from having burrs due to the residual chips, thereby improving the shape of the cross section of the screw 9.

[0052] Preferably, the notch 43 is connected to the thread slope at the end of the thread blade, and a gap is formed between the thread slope and the corresponding end face of the fixed knife 2 or the movable knife 4. The contact mode of the thread slope can help better control the chips generated during the cutting process, making it easier for them to fall off from the cross section of the screw rod, and then flow along the spiral slope into the notch 43, which helps to more effectively remove the chips after cutting and reduce or avoid the possibility of remaining near the blade.

[0053] Specifically, the notch 43 is provided with a recess away from the thread cutting edge, that is, away from the thread cutting edge, with a larger space, so that the chips can be concentrated in the recess, thereby providing more space to collect the chips after cutting, reducing the friction between the screw cutter and the chips, and avoiding burrs on the screw cross section.

[0054] Among them, the fixed knife 2 and the movable knife 4 are provided with fixing holes 22 connected with the fastening screws, so that the fixed knife 2 and the movable knife 4 can be firmly fixed on the cutting machine to prevent them from loosening during the shearing process. The fixed knife 2 or the movable knife 4 can be firmly fixed by simply tightening the fastening screws without additional fastening. The installation method is simple. When the fixed knife 2 or the movable knife 4 needs to be replaced, it is only necessary to loosen the fastening screws, replace the new fixed knife 2 or the movable knife 4, and re-tighten the fastening screws, which is convenient for replacement.

[0055] Specifically, the fixed knife 2 and the movable knife 4 are provided with a positioning hole 42 connected to the positioning pin at a position off-center. The positioning hole 42 is connected to the positioning pin to more accurately position the fixed knife 2 and the movable knife 4, thereby ensuring the position of the screw cutter during the cutting process and improving the accuracy of cutting. The combined design of the positioning hole 42 and the positioning pin helps to reduce the swing and shaking of the screw cutter during the cutting process, reduces the abnormal vibration of the screw cutter, and improves the stability of cutting. The positioning hole 42 can prevent the screw cutter from shifting during use, and the positioning pin can ensure that the screw cutter is firmly fixed in the designed position, thereby improving the stability of the screw cutter. The positioning hole 42 connected to the positioning pin can prevent the screw cutter from accidentally falling off or moving, thereby improving the safety of cutting.

[0056] like Figure 1 , Figures 9 and 10 As shown, in one embodiment, the cam 6 includes a low-position concave surface 62, an involute surface 61, and an arc transition surface 64 connecting the low-position concave surface 62 and the involute surface 61 along the circumferential direction. The top of the arc transition surface 64 is rounded. When the roller 7 cooperates with the low-position concave surface 62, the screw cutter is in a state of waiting for shearing. When the roller 7 passes over the arc transition surface 64 and cooperates with the involute surface 61, the involute surface 61 drives the shear arm 3 to swing and drives the movable knife 4 to cooperate with the fixed knife 2 to shear the screw.

[0057] In this embodiment, Figure 1 The screw cutter is in the waiting state for shearing. At this time, the contact position between the roller 7 and the cam 6 is at the lowest position, and the fixed knife 2 and the movable knife 4 are at the maximum opening position, which is the waiting state for shearing; Fig. 9 The screw cutting machine is in the shearing state, the fixed knife 2 and the movable knife 4 have just contacted the screw 17, and the roller 7 has passed the fillet position and entered the involute position through the arc transition surface 64, which belongs to the shearing state; Fig.10The screw cutter is in the shearing completion state, at this time, state 3, the contact position between the roller 7 and the cam 6 is at the tail end of the involute surface 61, and the shearing process is about to be completed, which belongs to the shearing completion state.

[0058] When the cam 6 and the roller 7 are in the shearing state, the roller 7 does not contact the fillet of the cam 6, but contacts the involute surface 61 of the cam 6. At this time, it can avoid the roller 7 and the fillet of the cam 6 contacting when the screw cutter is in the shearing state, which leads to excessive cutting current and motor damage. The cam 6 passes over the arc transition surface 64, and the involute surface 61 along the circumferential direction cooperates with the roller 7 to achieve smooth driving, making the shearing process more stable and accurate, reducing the friction generated during the shearing process, and providing a stronger shearing force when processing harder or larger diameter screws. The cam 6 moves along the arc transition surface 64. The circumferential arc transition surface 64 can make the roller 7 move more smoothly when transitioning from the low-position concave surface 62 to the involute surface 61, which can reduce the vibration and impact in the transmission process and improve the stability of power transmission; the combination of the circumferential low-position concave surface 62 and the involute surface 61 of the cam 6 can enable the screw cutter to be in a waiting state or a shearing state at different positions, thereby increasing the flexibility of the screw cutter. The shearing mechanism is formed by the combination of the cam 6 and the roller 7, the movable knife 4 and the fixed knife 2, and the cutting of the screw can be completed stably and efficiently during the cutting process.

[0059] In addition to the above-mentioned preferred embodiments, the present invention also has other implementation modes. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection requested by the present invention.

Claims

1. A screw cutting machine for conveniently cutting different screws, comprising a shearing assembly and a driving assembly, wherein the shearing assembly comprises a shearing seat, a fixed knife fixed to the shearing seat, a shearing arm hinged to the shearing seat, a movable knife fixed to the shearing arm, a reset spring connected to the shearing arm, a cam rotatably connected to the shearing seat, and a roller rotatably connected to the shearing arm, wherein the driving assembly comprises a motor and a reducer for driving the cam to rotate, wherein the cam is provided with an involute surface, and when the involute surface cooperates with the roller, the shearing arm is driven to swing, and the movable knife and the fixed knife cooperate to shear the screw, wherein the screw cutting machine is further provided with a screw supporting seat for supporting the screw on one side of the fixed knife, and wherein the screw supporting seat is provided for supporting the screw, and wherein the screw cutting machine comprises a screw supporting seat for supporting the screw, and wherein the screw supporting seat is provided ... The screw support seat includes a seat body and a rotating member rotatably connected to the seat body. The rotating member has at least two screw support grooves evenly distributed around the rotation center. Through the rotation of the rotating member, one of the screw support grooves is selected to support a screw of corresponding specifications.

2. A screw cutting machine for conveniently cutting different screws according to claim 1, characterized in that: A middle convex portion is provided at the center of the upper portion of the rotating member, and a first screw rod supporting groove and a second screw rod supporting groove are respectively provided on both sides of the width of the middle convex portion of the rotating member.

3. A screw cutting machine for conveniently cutting different screws according to claim 2, characterized in that: A third screw rod supporting groove and a fourth screw rod supporting groove are respectively provided on both sides of the length of the middle convex portion.

4. A screw cutting machine for conveniently cutting different screws according to claim 1, characterized in that: A rotation positioning surface is provided between the rotating member and the seat body for maintaining the relative position of the rotating member and the seat body after the rotating member rotates to a set angle, so that one of the screw rod supporting grooves supports a screw rod of corresponding specifications.

5. A screw cutting machine for conveniently cutting different screws according to claim 4, characterized in that: A central hole and a central rotating shaft for active cooperation are arranged between the rotating member and the seat body, and a spring is arranged between the rotating member and the seat body.

6. A screw cutting machine for conveniently cutting different screws according to claim 5, characterized in that: The spring is sleeved on the central rotating shaft; or, at least two springs are evenly arranged around the central rotating shaft.

7. A screw cutting machine for conveniently cutting different screws according to claim 3, characterized in that: The bottom walls of the first screw supporting groove, the second screw supporting groove, the third screw supporting groove and the fourth screw supporting groove are inclined surfaces or arc surfaces descending downward toward the center.

8. A screw cutting machine for conveniently cutting different screws according to claim 7, characterized in that: A circular arc concave surface is provided at the position where the first screw supporting groove and the second screw supporting groove connect with the middle convex portion.

9. A screw cutting machine for conveniently cutting different screws according to claim 3, characterized in that: The fixed knife is a square structure, and a fixed knife thread cutting edge is provided on each of the four sides. The movable knife is a square structure, and a movable knife thread cutting edge is provided on each of the four sides. The four fixed knife thread cutting edges and the four movable knife thread cutting edges are different in size and correspond one-to-one with four screws of corresponding specifications.

10. A screw cutting machine for conveniently cutting different screws according to claim 9, characterized in that: The fixed knife and the movable knife are provided with fixing holes connected with the fastening screws.

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