Blade fixing structure and shearing tool

Abstract

The utility model provides a blade fixing structure and a shearing tool, the blade fixing structure comprises a blade, a driving shaft and an axial limiting piece, the driving shaft is provided with a shaft shoulder, and the shaft shoulder abuts against one side of the blade; the axial limiting piece is arranged on the driving shaft and abuts against one side of the blade; a limiting boss is arranged on the driving shaft in a protruding mode, a limiting groove is formed in the blade, the limiting boss extends into the limiting groove, and the size of the limiting boss in the circumferential direction of the driving shaft is gradually increased in the direction away from the center axis of the driving shaft. The blade is positioned in the radial direction through the cooperation between the limiting groove of the blade and the limiting boss of the driving shaft, the blade is positioned in the axial direction through the cooperation between the blade and the shaft shoulder of the driving shaft and the axial limiting piece, and due to the fact that the size of the limiting boss is gradually increased, the blade can be positioned in the radial direction. Therefore, the stress surface of the blade and the driving shaft in the shearing process is enlarged, the pressure on the blade is reduced, and the problem that the blade is torn is avoided.

Description

Technical Field

[0001] The embodiments of the present utility model relate to the technical field of power tools, and particularly to a blade fixing structure and a cutting tool. Background Art

[0002] The connection mode between the blade of a cutting tool such as a pipe cutter and the drive shaft is through a boss on a parallel plane. The boss similar to a square is used to position the blade and the drive shaft in the radial direction. This connection mode has the problem that the force-bearing surface between the blade and the drive shaft during cutting is very small, which will cause a large pressure on the blade and directly tear the blade. Summary of the Utility Model

[0003] The purpose of the embodiments of the present utility model is to provide a blade fixing structure and a cutting tool, aiming to solve the problem that the blade of the existing cutting tool will generate a large pressure during operation, resulting in the tearing of the blade.

[0004] To solve the above technical problems, the embodiments of the present utility model provide a blade fixing structure, including:

[0005] A blade, with a mounting hole provided on the blade;

[0006] A drive shaft, one end of the drive shaft is inserted into the mounting hole, and a shoulder is provided on the drive shaft, and the shoulder abuts against one side of the blade in the axial direction of the drive shaft;

[0007] An axial limiting member, which is arranged on the drive shaft, and the axial limiting member abuts against the side of the blade far from the shoulder;

[0008] Wherein, a limiting boss protrudes from the circumferential surface of the drive shaft, and a limiting groove adapted to the shape of the limiting boss is provided on the surface of the blade close to the shoulder. The limiting boss extends into the limiting groove, and the dimension of the limiting boss in the circumferential direction of the drive shaft gradually increases in the direction away from the central axis of the drive shaft.

[0009] The present utility model realizes the positioning of the blade in the radial direction of the drive shaft through the cooperation between the limiting groove of the blade and the limiting boss of the drive shaft, and at the same time realizes the positioning of the blade in the axial direction of the drive shaft through the cooperation between the blade, the shoulder of the drive shaft and the axial limiting member. In this way, the assembly method of the blade becomes relatively simple, and since the dimension of the limiting boss gradually increases in the direction away from the central axis of the drive shaft, the force-bearing surface between the blade and the drive shaft during cutting is increased, the pressure on the blade is reduced, and the problem of blade tearing is avoided.

[0010] Preferably, a plurality of the limiting bosses are arranged at intervals along the circumferential direction of the driving shaft, and a plurality of the limiting grooves are arranged corresponding to the plurality of the limiting bosses.

[0011] Preferably, the cross-sectional shape of the limiting boss is fan-shaped, and the center of the fan is located on the central axis of the driving shaft.

[0012] Preferably, two limiting bosses are provided, and the two limiting bosses are symmetrically arranged in the radial direction of the driving shaft.

[0013] Preferably, an annular boss extending along the circumferential direction of the driving shaft is convexly provided on the circumferential side surface of the driving shaft and located on the shaft shoulder, the shape of the annular boss is adapted to the shape of the mounting hole, and the annular boss extends into the mounting hole.

[0014] Preferably, the table surface of the annular boss away from the shaft shoulder is flush with the surface of the blade away from the shaft shoulder.

[0015] Preferably, the limiting boss is located on one side of the annular boss away from the central axis of the driving shaft, and one end of the limiting boss close to the central axis of the driving shaft is connected to the annular boss.

[0016] Preferably, the limiting groove axially penetrates through the blade on the driving shaft.

[0017] Preferably, the limiting boss is located on the shaft shoulder.

[0018] Preferably, the table surface of the limiting boss away from the shaft shoulder is flush with the surface of the blade away from the shaft shoulder.

[0019] Preferably, the axial limiting member is fixedly arranged on the driving shaft through a screwing member; a threaded hole is provided on the table surface of the limiting boss away from the shaft shoulder, a first through hole is provided on the axial limiting member corresponding to the threaded hole, and the tail of the screwing member passes through the axial limiting member from the first through hole and is threadedly connected to the threaded hole.

[0020] Preferably, the axial limiting member is a pressing plate, a second through hole is provided on the pressing plate, and one end of the driving shaft close to the blade passes through the pressing plate from the second through hole.

[0021] To achieve the above object, the present invention further provides a shearing tool, including the above-mentioned blade fixing structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] One or more embodiments are exemplarily illustrated by the pictures in the corresponding drawings. These exemplary illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings represent similar elements. Unless otherwise stated, the drawings in the figures do not constitute a scale limitation.

[0023] Figure 1 This is an exploded view of the blade fixing structure in the embodiment of the present utility model;

[0024] Figure 2 is Figure 1 a cross-sectional view of a partial structure of the blade fixing structure in

[0025] Figure 3 This is a schematic structural view of the cutting tool in the embodiment of the present utility model;

[0026] Figure 4 is Figure 3 a cross-sectional view of the cutting tool in

[0027] Figure 5 is Figure 3 a schematic structural view of a partial structure of the cutting tool in

[0028] Figure 6 is Figure 5 a cross-sectional view of a partial structure of the cutting tool in

[0029] Explanation of the reference numerals in the drawings of the present utility model:

[0030] Cutting tool 1000, blade fixing structure 100, blade 1, mounting hole 11, limiting groove 12, drive shaft 2, shaft shoulder 21, limiting boss 22, annular boss 23, threaded hole 24, axial limiting member 3, pressing plate 3a, first through hole 31, second through hole 32, screwing member 4, bevel gear transmission mechanism 5, housing 200, driver 300.

[0031] The realization of the purpose, functional features and advantages of the present utility model will be further described in conjunction with the embodiments and with reference to the drawings. Detailed implementation manners

[0032] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts belong to the scope of protection of the present utility model.

[0033] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, then such directional indications are only used to explain the relative positional relationship, movement conditions, etc. between components in a certain specific posture (as shown in the attached drawings). If this specific posture changes, then the directional indications will also change accordingly.

[0034] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, then such descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0035] The present utility model provides a blade fixing structure, which can be used in shearing tools such as pipe cutters. Hereinafter, taking the blade fixing structure used in a pipe cutter as an example for introduction. Figure 1 and Figure 2 show a preferred embodiment of the blade fixing structure provided by the present utility model.

[0036] Please refer to Figure 1 and Figure 2 , in this embodiment, the blade fixing structure 100 includes a blade 1, a drive shaft 2, and an axial limiting member 3. An installation hole 11 is provided on the blade 1; one end of the drive shaft 2 is inserted into the installation hole 11, and a shaft shoulder 21 is provided on the drive shaft 2. The shaft shoulder 21 abuts against one side of the blade 1 in the axial direction of the drive shaft 2; the axial limiting member 3 is provided on the drive shaft 2, and the axial limiting member 3 abuts against the side of the blade 1 away from the shaft shoulder 21; wherein, a limiting boss 22 protrudes from the circumferential surface of the drive shaft 2, and a limiting groove 12 matching the shape of the limiting boss 22 is provided on the surface of the blade 1 close to the shaft shoulder 21. The limiting boss 22 extends into the limiting groove 12, and the dimension of the limiting boss 22 in the circumferential direction of the drive shaft 2 gradually increases in the direction away from the central axis of the drive shaft 2.

[0037] Specifically, the blade 1 includes a cutting edge portion. An installation hole 11 is provided at one end of the blade 1 away from the cutting edge portion, and the blade 1 is sleeved outside one end of the drive shaft 2 through the installation hole 11. A shaft shoulder 21 is provided on the drive shaft 2. The shaft shoulder 21 is located on one side of the blade 1 in the axial direction of the drive shaft 2. The shaft shoulder 21 has a shaft shoulder surface facing the blade 1. The shaft shoulder surface of the shaft shoulder 21 is perpendicular or approximately perpendicular to the axial direction of the drive shaft 2, and the shaft shoulder surface of the shaft shoulder 21 abuts against the surface of the blade 1 close to the shaft shoulder 21.

[0038] The specific setting method of the part of the drive shaft 2 sleeved in the mounting hole 11 can be set according to the actual situation. Optionally, please refer to Figure 1 and Figure 2 , in this embodiment, an annular boss 23 extending along the circumferential direction of the drive shaft 2 is convexly provided on the circumferential side surface of the drive shaft 2 and located on the shoulder 21. The shape of the annular boss 23 is adapted to the shape of the mounting hole 11, and the annular boss 23 extends into the mounting hole 11.

[0039] Specifically, the annular boss 23 is provided at the connection between the shoulder surface of the shoulder 21 and the circumferential side surface of the drive shaft 2. The annular boss 23 is arranged in a circular ring shape. Correspondingly, the mounting hole 11 is a circular hole. In this way, by providing the annular boss 23 on the part of the drive shaft 2 sleeved in the mounting hole 11, the strength of the connection between the drive shaft 2 and the blade 1 can be improved.

[0040] One end of the annular boss 23 away from the shoulder 21 can be located inside the mounting hole 11, or one end of the annular boss 23 away from the shoulder 21 can also extend out of the mounting hole 11. Optionally, please refer to Figure 1 and Figure 2 , in this embodiment, the table surface of the annular boss 23 away from the shoulder 21 is flush with the surface of the blade 1 away from the shoulder 21.

[0041] Specifically, the dimension of the annular boss 23 in the axial direction of the drive shaft 2 is equal to or approximately equal to the dimension of the mounting hole 11 in the axial direction of the drive shaft 2, so that the table surface of the annular boss 23 away from the shoulder 21 is flush with the hole edge of the mounting hole 11 away from the shoulder 21.

[0042] A limiting boss 22 is convexly provided on the circumferential side surface of the drive shaft 2. The limiting boss 22 is located on the side of the shoulder 21 close to the blade 1. The limiting boss 22 can be not connected to the shoulder 21, that is, the limiting boss 22 and the shoulder 21 are arranged at intervals in the axial direction of the drive shaft 2; the limiting boss 22 can also be connected to the shoulder 21, that is, the limiting boss 22 and the shoulder 21 are integrally formed. Optionally, please refer to Figure 1 and Figure 2 , in this embodiment, the limiting boss 22 is located on the shoulder 21.

[0043] Specifically, the limiting boss 22 is provided at the connection between the shoulder surface of the shoulder 21 and the circumferential side surface of the drive shaft 2. The limiting boss 22 is connected to the shoulder 21, which can improve the strength of the drive shaft 2 at the limiting boss 22.

[0044] A limiting groove 12 is provided on the surface of the blade 1 close to the shaft shoulder 21 corresponding to the limiting boss 22, and the shape of the limiting groove 12 is adapted to the shape of the limiting boss 22. The limiting boss 22 extends into the limiting groove 12, so as to be able to limit the rotation of the blade 1 relative to the drive shaft 2, so as to realize the positioning of the blade 1 in the radial direction of the drive shaft 2.

[0045] The limiting groove 12 is arranged on the surface of the blade 1 close to the shaft shoulder 21. The limiting groove 12 may penetrate the surface of the blade 1 far from the shaft shoulder 21, or the limiting groove 12 may not penetrate the surface of the blade 1 far from the shaft shoulder 21. Optionally, please refer to Figure 1 and Figure 2 , in this embodiment, the limiting groove 12 penetrates the blade 1 in the axial direction of the drive shaft 2.

[0046] Specifically, let the limiting groove 12 penetrate the blade 1, so that the groove depth of the limiting groove 12 can be increased as much as possible, which is beneficial to improving the effect of radially positioning the blade 1 through the limiting boss 22 and the limiting groove 12.

[0047] In the case where the limiting groove 12 penetrates the blade 1, the end of the limiting boss 22 far from the shaft shoulder 21 may be located in the limiting groove 12, or the end of the limiting boss 22 far from the shaft shoulder 21 may extend out of the limiting groove 12. Optionally, please refer to Figure 1 and Figure 2 , in this embodiment, the table surface of the limiting boss 22 far from the shaft shoulder 21 is flush with the surface of the blade 1 far from the shaft shoulder 21.

[0048] Specifically, the dimension of the limiting boss 22 in the axial direction of the drive shaft 2 is equal to or approximately equal to the dimension of the limiting groove 12 in the axial direction of the drive shaft 2, so that the table surface of the annular boss 23 far from the shaft shoulder 21 is flush with the hole edge of the mounting hole 11 far from the shaft shoulder 21.

[0049] The dimension of the limiting boss 22 in the circumferential direction of the drive shaft 2 is gradually increased in the direction away from the central axis of the drive shaft 2. Here, the dimension of the limiting boss 22 in the circumferential direction of the drive shaft 2 is defined as the width of the limiting boss 22, and the width of the limiting boss 22 is gradually increased in the direction away from the central axis of the drive shaft 2. In view of the fact that the boss on the drive shaft in the prior art is approximately square, that is, the width of the boss on the drive shaft in the prior art is fixed, compared with setting the boss on the drive shaft as square in the prior art, since the width of the limiting boss 22 is gradually increased in the direction away from the central axis of the drive shaft 2, the force-bearing surface between the blade 1 and the drive shaft 2 during shearing is increased, the pressure on the blade 1 is reduced, and the problem of blade tearing is avoided.

[0050] The limiting boss 22 has two opposite side surfaces in the circumferential direction of the drive shaft 2, and the two side surfaces of the limiting boss 22 can be curved surfaces or flat surfaces. Optionally, please refer to Figure 1 and Figure 2 , in this embodiment, the cross-sectional shape of the limiting boss 22 is fan-shaped, and the center of the fan is located on the central axis of the drive shaft 2. The size of the central angle of the limiting boss 22 can be set according to the actual situation. For example, the central angle of the limiting boss 22 can be 30° to 90°. Hereinafter, the limiting boss 22 with a fan-shaped cross-sectional shape will be taken as an example for introduction.

[0051] A plurality of limiting bosses 22 are usually arranged at intervals along the circumferential direction of the drive shaft 2, and a plurality of limiting grooves 12 are also arranged corresponding to the plurality of limiting bosses 22, so as to further increase the force-bearing surface between the blade 1 and the drive shaft 2 during the shearing process. Optionally, please refer to Figure 1 and Figure 2 , in this embodiment, a plurality of limiting bosses 22 and limiting grooves 12 are arranged at uniform intervals along the circumferential direction of the drive shaft 2 and correspond to each other one by one.

[0052] For example, please refer to Figure 1 and Figure 2 , in this embodiment, two limiting bosses 22 are arranged, and the two limiting bosses 22 are symmetrically arranged in the radial direction of the drive shaft 2.

[0053] Specifically, hereinafter, the case where two limiting bosses 22 are symmetrically arranged on the drive shaft 2 will be taken as an example for introduction. Sector-shaped limiting bosses 22 are arranged on both sides of the drive shaft 2. Correspondingly, two sector-shaped limiting grooves 12 are arranged on the blade 1. The force-bearing surface between the blade 1 and the drive shaft 2 during the shearing process passes through the central axis of the drive shaft 2, and the force-bearing surface is borne by the contact planes of the two limiting bosses 22, thereby increasing the force-bearing surface between the blade 1 and the drive shaft 2 during the shearing process.

[0054] The drive shaft 2 is provided with a limiting boss 22 and an annular boss 23. Optionally, please refer to Figure 1 and Figure 2 , in this embodiment, the limiting boss 22 is located on the side of the annular boss 23 away from the central axis of the drive shaft 2, and one end of the limiting boss 22 close to the central axis of the drive shaft 2 is connected to the annular boss 23.

[0055] Specifically, the limiting boss 22 and the annular boss 23 are both arranged on the shoulder surface of the shaft shoulder 21, and the limiting boss 22 is located outside the annular boss 23. The limiting boss 22 is farther from the central axis of the driving shaft 2 than the annular boss 23. The limiting boss 22 and the annular boss 23 are integrally formed and connected, so as to improve the strength of the driving shaft 2 at the limiting boss 22 and the annular boss 23. Corresponding to the limiting boss 22 and the annular boss 23 on the driving shaft 2, the mounting holes 11 and the limiting grooves 12 on the blade 1 are communicated.

[0056] The axial limiting member 3 is fixedly arranged on the driving shaft 2. The axial limiting member 3 is located on the side of the blade 1 away from the shaft shoulder 21. The axial limiting member 3 abuts against the surface of the blade 1 away from the shaft shoulder 21. In this way, through the cooperation between the blade 1, the shaft shoulder 21 of the driving shaft 2, and the axial limiting member 3, the positioning of the blade 1 in the axial direction of the driving shaft 2 can be realized.

[0057] The specific fixing method of the axial limiting member 3 on the driving shaft 2 may not be specifically limited. For example, the axial limiting member 3 can be fixedly arranged on the driving shaft 2 by means of threaded connection or snap connection. Optionally, please refer to Figure 1 and Figure 2 , in this embodiment, the axial limiting member 3 is fixedly arranged on the driving shaft 2 by a screwing member 4; a threaded hole 24 is arranged on the table surface of the limiting boss 22 away from the shaft shoulder 21, and a first through hole 31 corresponding to the threaded hole 24 is arranged on the axial limiting member 3. The tail of the screwing member 4 passes through the axial limiting member 3 from the first through hole 31 and is threadedly connected to the threaded hole 24.

[0058] Specifically, the table surfaces of the limiting boss 22 and the annular boss 23 are flush with the hole edge of the mounting hole 11 away from the shaft shoulder 21, so that the axial limiting member 3 can fit against the table surfaces of the limiting boss 22 and the annular boss 23, and the hole edge of the mounting hole 11 away from the shaft shoulder 21. Two threaded holes 24 are respectively arranged on the two limiting bosses 22, two first through holes 31 corresponding to the two threaded holes 24 are arranged on the axial limiting member 3, and two screwing members 4 are respectively installed at the two first through holes 31, so as to fixedly arrange the axial limiting member 3 on the driving shaft 2 through the two screwing members 4. Among them, the screwing member 4 can be a screw or the like.

[0059] The specific style of the axial limiting member 3 can be set according to the actual situation. Optionally, please refer to Figure 1 and Figure 2 , in this embodiment, the axial limiting member 3 is a pressing plate 3a, and a second through hole 32 is arranged on the pressing plate 3a. One end of the driving shaft 2 close to the blade 1 passes through the pressing plate 3a from the second through hole 32.

[0060] Specifically, one side of the blade 1 is positioned by relying on the shoulder 21 of the drive shaft 2, and the other side of the blade 1 is fixed to the drive shaft 2 by two screws plus a pressing plate 3a, so that the assembly method of the blade 1 becomes relatively simple.

[0061] Optionally, please refer to Figure 1 and Figure 2 , in this embodiment, a transmission mechanism is provided at one end of the drive shaft 2 away from the blade 1, and the transmission mechanism is used to drive the drive shaft 2 to rotate. The specific setting method of the transmission mechanism can be set according to the actual situation. For example, the transmission mechanism can be a bevel gear transmission mechanism 5. Hereinafter, the case where a bevel gear transmission mechanism 5 is provided at one end of the drive shaft 2 away from the blade 1 will be taken as an example for introduction.

[0062] The present utility model realizes the positioning of the blade 1 in the radial direction of the drive shaft 2 through the cooperation between the limiting groove 12 of the blade 1 and the limiting boss 22 of the drive shaft 2, and at the same time realizes the positioning of the blade 1 in the axial direction of the drive shaft 2 through the cooperation between the blade 1 and the shoulder 21 of the drive shaft 2 and the axial limiting member 3. In this way, the assembly method of the blade 1 becomes relatively simple, and since the size of the limiting boss 22 is gradually increased in the direction away from the central axis of the drive shaft 2, the force-bearing surface between the blade 1 and the drive shaft 2 during the shearing process is increased, the pressure on the blade 1 is reduced, and the problem of blade tearing is avoided.

[0063] The present utility model also provides a shearing tool, which can be a pipe shear or the like. The shearing tool includes a blade fixing structure. Since the blade fixing structure adopts the technical solution of the above embodiment, it has the beneficial effects brought by the technical solution of the above embodiment. Figures 3 to 6 FIG. shows a preferred embodiment of the shearing tool provided by the present utility model.

[0064] Please refer to Figures 3 to 6 , in this embodiment, the shearing tool 1000 further includes a housing 200 and a driver 300. A shearing opening is formed on the housing 200, the blade fixing structure 100 is disposed at the shearing opening of the housing 200, the driver 300 is disposed inside the housing 200, and the driver 300 is connected to the drive shaft 2 through the bevel gear transmission mechanism 5, so as to be able to drive the drive shaft 2 to rotate through the driver 300, and drive the blade 1 to swing at the shearing opening through the drive shaft 2, so as to realize the shearing action of the shearing tool 1000. Among them, the driver 300 can be a motor or the like.

[0065] The above are only the preferred embodiments of the present utility model, and do not limit the patent scope of the present utility model. Any equivalent structural transformation made under the inventive concept of the present utility model by using the content of the specification and drawings of the present utility model, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present utility model.

Claims

1. A blade fixing structure, characterized in that: include: A blade, wherein a mounting hole is provided on the blade; A drive shaft, one end of which is inserted into the mounting hole, and a shaft shoulder is provided on the drive shaft, and the shaft shoulder abuts against one side of the blade in the axial direction of the drive shaft; An axial stopper, wherein the axial stopper is arranged on the driving shaft and abuts against a side of the blade away from the shaft shoulder; Among them, a limiting boss is convexly provided on the circumferential side surface of the driving shaft, and a limiting groove adapted to the shape of the limiting boss is provided on the surface of the blade close to the shaft shoulder, and the limiting boss extends into the limiting groove. The size of the limiting boss in the circumferential direction of the driving shaft is gradually increased in the direction away from the central axis of the driving shaft.

2. The blade fixing structure according to claim 1, characterized in that: A plurality of the limiting bosses are arranged at intervals along the circumference of the driving shaft, and a plurality of the limiting grooves are arranged corresponding to the plurality of the limiting bosses; and / or, The cross-section of the limiting boss is fan-shaped, and the center of the fan is located on the central axis of the driving shaft.

3. The blade fixing structure according to claim 2, characterized in that: Two limiting bosses are provided, and the two limiting bosses are symmetrically arranged in the radial direction of the driving shaft.

4. The blade fixing structure according to claim 1, characterized in that: An annular boss extending along the circumference of the drive shaft is protruded on the circumferential side surface of the drive shaft and located on the shaft shoulder. The shape of the annular boss is matched with the shape of the mounting hole, and the annular boss extends into the mounting hole.

5. The blade fixing structure according to claim 4, characterized in that: The surface of the annular boss away from the shoulder is flush with the surface of the blade away from the shoulder; and / or, The limiting boss is located at a side of the annular boss away from the central axis of the driving shaft, and one end of the limiting boss close to the central axis of the driving shaft is connected to the annular boss.

6. The blade fixing structure according to claim 1, characterized in that: The limiting groove passes through the blade in the axial direction of the driving shaft; and / or, The limiting boss is located on the shaft shoulder.

7. The blade fixing structure according to claim 6, characterized in that: The surface of the limiting boss away from the shaft shoulder is flush with the surface of the blade away from the shaft shoulder.

8. The blade fixing structure according to any one of claims 1 to 7, characterized in that: The axial limit member is fixed on the driving shaft through a screw connection; a threaded hole is provided on the surface of the limit boss away from the shaft shoulder, and a first through hole is provided on the axial limit member corresponding to the threaded hole, and the tail of the screw connection passes through the axial limit member from the first through hole and is threadedly connected with the threaded hole.

9. The blade fixing structure according to any one of claims 1 to 7, characterized in that: The axial limiting member is a pressure plate, and a second through hole is arranged on the pressure plate. One end of the driving shaft close to the blade passes through the pressure plate from the second through hole.

10. A shearing tool, characterized in that: It comprises a blade fixing structure as described in any one of claims 1-9.

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