Circular knife locking device of cut-off machine

Abstract

The technical scheme belongs to the technical field of cut-off equipment, and particularly relates to a circular knife locking device of a cut-off machine, which comprises a fixed seat, an installation cavity and an installation hole are arranged in the fixed seat, and the inner side wall of the installation hole is communicated with the side wall of the installation cavity through an opening; the circular knife is mounted in the mounting cavity, and the side wall of the circular knife extends into the mounting hole through the opening; the locking mechanism is mounted in the mounting hole and movably abuts against the side wall of the circular cutter; the locking mechanism comprises a locking rod which is arranged in the mounting hole in a penetrating mode, and the locking rod is provided with a second abutting part. The first locking block is arranged in the mounting hole in a sliding mode and arranged on the locking rod, and the first locking block is provided with a first abutting part; the first locking block is driven by the locking rod to slide in the mounting hole, so that the first abutting part and the second abutting part are close to each other and abut against the side wall of the circular knife, the circular knife is mounted in the mounting cavity, the locking force on the circular knife is improved, the fixing stability of the circular knife is enhanced, and the situation that the cutting effect is affected due to displacement of the circular knife is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of cutting equipment, and in particular to a circular knife locking device for a cutting machine. Background Art

[0002] A cutting machine is a device commonly used to cut various materials (such as steel bars, etc.), which can cut the materials neatly.

[0003] For example, a cutting device and a straightening machine disclosed in Chinese patent CN202022481168.2 have two fixing holes and two through holes at the lower end of a box body. The fixed knife is fixed in the second fixing hole. A locking rod is movably provided in the second through hole. A clamping groove is concavely formed in the side wall of the locking rod. When the locking rod is pulled, the inner wall of the clamping groove abuts or separates with the side wall of the fixed knife, thereby achieving the fixing or separation of the fixed knife on the box body.

[0004] However, this structure still has some shortcomings: after the locking rod is pulled, only part of the inner wall of the clamping groove abuts against the side wall of the fixed knife, and the locking force is insufficient, which easily causes the fixed knife to shift and affects the cutting effect. Utility Model Content

[0005] The purpose of this technical solution is to provide a circular knife locking device for a cutting machine, which drives the abutment part 1 and the abutment part 2 to approach each other and abut against the side wall of the circular knife through the locking rod to fix the circular knife, thereby improving the problem of insufficient locking force of the existing circular knife causing displacement of the circular knife.

[0006] The purpose of this technical solution is achieved in this way:

[0007] A circular knife locking device for a cutting machine, comprising:

[0008] A fixing seat, wherein a mounting cavity and a mounting hole are provided therein, and an inner side wall of the mounting hole is connected to a side wall of the mounting cavity through an opening;

[0009] A circular knife is installed in the installation cavity, and the side wall of the circular knife extends into the installation hole through the opening;

[0010] a locking mechanism, which is installed in the mounting hole and movably abuts against the side wall of the circular knife to fix the circular knife in the mounting cavity;

[0011] Wherein, the locking mechanism includes:

[0012] a locking rod, which is inserted into the mounting hole and is provided with a second abutment portion;

[0013] A locking block 1 is slidably disposed in the mounting hole and disposed on the locking rod, and the locking block 1 has an abutting portion 1;

[0014] The locking block 1 is driven by the locking rod to slide in the mounting hole, so that the abutment portion 1 and the abutment portion 2 approach each other and abut the side wall of the circular knife, thereby realizing the installation of the circular knife in the mounting cavity.

[0015] Preferably, the locking mechanism further comprises:

[0016] A second locking block is slidably disposed in the mounting hole and is disposed on the locking rod, and the second locking block has the second abutting portion;

[0017] The locking block 1 and the locking block 2 are driven to approach each other by the locking rod, so that the abutting portion 1 and the abutting portion 2 both abut against the side wall of the circular knife, thereby realizing the installation of the circular knife in the installation cavity.

[0018] Preferably, the locking rod is provided with a threaded portion 1 and a limiting portion; the locking block 1 is provided with a threaded hole 1, the threaded portion 1 is threadedly connected to the threaded hole 1, and the locking block 1 is relatively stationary with respect to the mounting hole in the circumferential direction;

[0019] The second locking block is sleeved on the locking rod, and the limiting portion movably abuts against the second locking block to limit the movement of the second locking block in a direction away from the first locking block.

[0020] Preferably, the locking rod is provided with a first threaded portion and a second threaded portion, and the thread directions of the first threaded portion and the second threaded portion are opposite;

[0021] The locking block 1 is provided with a threaded hole 1, and the threaded portion 1 is threadedly connected to the threaded hole 1;

[0022] The second locking block is provided with a second threaded hole, and the second threaded portion is threadedly connected to the second threaded hole;

[0023] The locking block 1 and the locking block 2 are both relatively stationary with respect to the mounting hole in the circumferential direction.

[0024] Preferably, the second locking block is integrally formed on the locking rod.

[0025] Preferably, the locking rod is provided with a threaded portion 1, the locking block 1 is provided with a threaded hole 1, the threaded portion 1 is threadedly connected to the threaded hole 1, and the locking block 1 is relatively stationary with respect to the mounting hole in the circumferential direction.

[0026] Preferably, the first abutting portion and the second abutting portion are arc-shaped structures.

[0027] Preferably, a limiting platform is provided on the locking rod, and the limiting platform is movably abutted against the locking block 1 to limit the movement of the locking block 1 toward the direction close to the abutting portion 2.

[0028] Preferably, a boss is provided on the end edge of the fixing seat.

[0029] Preferably, through hole one and through hole two are respectively provided at both ends of the fixing seat, both through hole one and through hole two are connected to the installation cavity, and a protrusion is provided on the inner wall of through hole two, which movably abuts against the rear end of the circular knife.

[0030] Compared with the existing technology, this technical solution has the following outstanding and beneficial technical effects:

[0031] 1. This technical solution drives the locking block 1 to move by the locking rod, so that the abutment part 1 and the abutment part 2 approach each other and abut against the side wall of the circular knife to fix the circular knife, thereby increasing the locking force of the circular knife, enhancing the stability of the circular knife fixation, and preventing the circular knife from shifting and affecting the cutting effect.

[0032] 2. This technical solution realizes the axial movement of locking block 1 in the mounting hole through the cooperation between threaded portion 1 and threaded hole 1, and limits the axial movement of locking block 2 in the mounting hole through the limiting portion, so that locking block 1 and locking block 2 are close to each other to abut the circular knife, thereby ensuring the fixing force of the circular knife.

[0033] 3. This technical solution connects locking block 1 and locking block 2 respectively through threaded portion 1 and threaded portion 2 with opposite thread directions, so that locking block 1 and locking block 2 are close to each other to abut against the circular knife, ensuring the fixing force of the circular knife. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a structural diagram of Example 1.

[0035] Figure 2 It is a cross-sectional view of the locking mechanism of Example 1.

[0036] Figure 3 This is an exploded view of Example 1.

[0037] Figure 4 It is a cross-sectional view of the circular knife and the fixing seat of the first embodiment.

[0038] Figure 5 It is a cross-sectional view of the locking mechanism of Example 1.

[0039] Figure 6 It is a cross-sectional view of the locking mechanism of the second embodiment.

[0040] Figure 7 It is a cross-sectional view of the locking mechanism of embodiment 3.

[0041] Reference numerals: 1, fixing seat; 11, mounting cavity; 12, mounting hole; 13, opening; 14, boss; 15, through hole 1; 16, through hole 2; 17, raised portion;

[0042] 2. Circular knife; 21. Shearing channel;

[0043] 3. Locking rod; 31. Threaded portion 1; 32. Position limiting portion; 33. Threaded portion 2; 34. Position limiting platform;

[0044] 4. Locking block 1; 41. Abutment portion 1; 42. Threaded hole 1;

[0045] 5. Locking block 2; 51. Abutment portion 2; 52. Threaded hole 2. DETAILED DESCRIPTION

[0046] The specific implementation of this technical solution is further described in detail below with reference to the accompanying drawings. Figure 1-Figure 7 .

[0047] Example 1:

[0048] like Figure 1 , a circular knife locking device for a cutting machine, comprising:

[0049] The fixing base 1 has a mounting cavity 11 and a mounting hole 12 therein, and the inner side wall of the mounting hole 12 is connected to the side wall of the mounting cavity 11 through an opening 13. The fixing base 1 can be mounted on the frame of the cutting machine by bolts;

[0050] The circular knife 2 is installed in the mounting cavity 11, and the outer wall of the circular knife 2 extends into the mounting hole 12 through the opening 13;

[0051] A locking mechanism is installed in the mounting hole 12 and is in active contact with the side wall of the circular knife 2 to fix the circular knife 2 in the mounting cavity 11. The locking mechanism can achieve that the circular knife 2 is fixed in the mounting cavity 11 or is in an unlocked state with respect to the mounting cavity 11;

[0052] like Figure 2 、 Figure 3 and Figure 5 , wherein the locking mechanism includes:

[0053] The locking rod 3 is inserted into the mounting hole 12 and is rotatable within the mounting hole 12 about the axis of the locking rod 3;

[0054] A locking block 4 is slidably disposed in the mounting hole 12 and movably connected to the locking rod 3, and the locking block 4 has an abutment portion 41;

[0055] The second locking block 5 is slidably disposed in the mounting hole 12 and disposed on the locking rod 3, and the second locking block 5 has a second abutment portion 51;

[0056] The locking block 1 4 and the locking block 2 5 are driven to approach each other by the locking rod 3, so that the abutting portion 1 41 and the abutting portion 2 51 both abut the side wall of the circular knife 2, thereby abutting the other opposite side wall of the circular knife 2 against the inner wall of the installation cavity 11, so that the circular knife 2 is installed in the installation cavity 11, that is, the circular knife 2 is locked in the installation cavity 11. The locking block 1 4 and the locking block 2 5 can ensure the abutting force against the circular knife 2, thereby ensuring the stable installation of the circular knife 2 and the cutting effect.

[0057] The locking rod 3 is provided with a threaded portion 31 and a limiting portion 32, the threaded portion 31 is located in the front half of the locking rod 3, and the limiting portion 32 is located in the middle of the locking rod 3; the locking block 4 is provided with a threaded hole 42, the threaded portion 31 and the threaded hole 42 are connected by threads, and the locking block 4 and the mounting hole 12 are relatively stationary in the circumferential direction, that is, the locking block 4 cannot rotate in the mounting hole 12 with the axis of the mounting hole 12 as the center, but the locking block 4 can slide in the mounting hole 12 along the axis of the mounting hole 12;

[0058] The locking block 2 5 is sleeved on the locking rod 3, and the limiting portion 32 movably abuts against the locking block 2 5 to limit the movement of the locking block 2 5 in a direction away from the locking block 1 4;

[0059] By rotating the locking rod 3, the locking block 14 moves in the mounting hole 12 toward the locking block 2 5, so that the abutting portion 1 41 of the locking block 14 abuts against the side wall of the circular knife 2. At the same time, the locking block 14 reacts on the locking rod 3, so that the locking rod 3 drives the locking block 2 5 to move toward the locking block 1 4 under the action of the limiting portion 32, so that the abutting portion 2 51 abuts against the side wall of the circular knife 2, thereby achieving the mutual approach between the locking block 1 4 and the locking block 2 5.

[0060] like Figure 2 and Figure 5 The front end side wall of the locking block 1 4 is provided with an abutment portion 1 41, and the front end side wall of the locking block 2 5 is provided with an abutment portion 2 51. The limiting portion 32 movably abuts against the rear end of the locking block 2 5. The locking block 1 4 and the locking block 2 5 are arranged on the locking rod 3 with their front ends facing each other, that is, the front end of the locking block 1 4 and the front end of the locking block 2 5 are opposite to and close to each other on the locking rod 3, that is, the distance between the abutment portion 2 51 and the abutment portion 1 41 is smaller than the distance between the abutment portion 2 51 and the rear end of the locking block 1 4.

[0061] In this design, in order to achieve relative circumferential stillness of the locking block 4 and the mounting hole 12, the cross-sections of the mounting hole 12 and the locking block 4 are both rectangular. Other anti-rotation structures can also be used (for example, the cross-sections of the mounting hole 12 and the locking block 4 are both elliptical, triangular, or pentagonal, etc.), so that the locking block 4 cannot rotate circumferentially in the mounting hole 12, and at the same time, it can ensure that the abutting portion 41 faces the side wall of the circular knife 2, ensuring that the abutting portion 41 abuts against the side wall of the circular knife 2.

[0062] In order to ensure that the abutting portion 2 51 of the locking block 2 5 faces the side wall of the circular knife 2, the locking block 2 5 and the mounting hole 12 can be designed to be relatively stationary in the circumferential direction to ensure that the abutting portion 2 51 abuts against the side wall of the circular knife 2. The cross-section of the locking block 2 5 is rectangular and the same as the locking block 1 4. Other anti-rotation structures can also be used (for example, the cross-sections of the mounting hole 12 and the locking block 2 5 are both elliptical, triangular, or pentagonal, etc.).

[0063] Combine Figure 2 and Figure 3 The abutment portion 1 41 and the abutment portion 2 51 are arc-shaped structures, which ensure the abutment area with the side wall of the circular knife 2 and the stability of the abutment, thereby ensuring that the circular knife 2 is firmly locked.

[0064] Combine Figure 2 and Figure 3 A limit platform 34 is provided on the locking rod 3, and the limit platform 34 is located between the threaded portion 1 31 and the limit portion 32. The limit platform 34 is movably abutted against the front end of the locking block 1 4, and is used to limit the locking block 1 4 from moving toward the abutting portion 2 51 close to the locking block 2 5, thereby preventing the locking block 1 4 from moving in the direction close to the locking block 2 5 beyond the set distance, causing the locking block 1 4 to abut against the front end of the locking block 2 5 and wear, and preventing the locking block 1 4 from abutting against the side wall of the circular knife 2 with a force exceeding the set value and causing damage.

[0065] like Figure 3 and Figure 4 A boss 14 is provided on the end edge of the fixing seat 1, and the boss 14 is connected to the frame of the cutting machine by bolts to realize the installation of the fixing seat 1.

[0066] like Figure 4 A through hole 15 and a through hole 2 16 are respectively provided at both ends of the fixing seat 1. Both the through hole 15 and the through hole 2 16 are connected to the installation cavity 11. The circular knife 2 slides into the installation cavity 11 through the through hole 15. A protrusion 17 is provided on the inner wall of the through hole 2 16. The protrusion 17 movably abuts the rear end of the circular knife 2 to prevent the circular knife 2 from axially moving in the installation cavity 11, thereby ensuring that the installation position of the circular knife 2 in the installation cavity 11 is accurate.

[0067] Combine Figure 3 and Figure 4 A shearing channel 21 is provided in the circular knife 2 for allowing the material to pass through.

[0068] During installation, first place the circular knife 2 into the mounting cavity 11, then insert the locking rod 3 and the locking block 2 5 (or the abutment part 2 51) from one end of the mounting hole 12, and place the locking block 14 from one end of the mounting hole 12 and threadedly connected with the end of the locking rod 3, and finally perform the locking adjustment of the locking mechanism; or, first place the locking block 14, the locking rod 3 and the locking block 2 5 (or the abutment part 2 51) as a whole into the mounting hole 12, then place the circular knife 2 into the mounting cavity 11, and then rotate the locking rod 3 to adjust the locking mechanism.

[0069] Example 2:

[0070] The design of this embodiment is basically the same as that of the first embodiment, except that:

[0071] like Figure 6 The locking rod 3 is provided with a threaded portion 1 31 and a threaded portion 2 33, and the threaded directions of the threaded portion 1 31 and the threaded portion 2 33 are opposite. The threaded portion 1 31 is located in the front half of the locking rod 3, and the threaded portion 2 33 is located in the middle of the locking rod 3; the limit platform 34 is located between the threaded portion 1 31 and the threaded portion 2 33;

[0072] The locking block 14 is provided with a threaded hole 142, and the threaded portion 131 is threadedly connected to the threaded hole 142;

[0073] The locking block 5 is provided with a threaded hole 52, and the threaded portion 33 is threadedly connected to the threaded hole 52;

[0074] The locking block 1 4 and the locking block 2 5 are both relatively stationary with respect to the mounting hole 12 in the circumferential direction;

[0075] When the locking rod 3 is rotated, the locking block 1 4 and the locking block 2 5 are moved in the mounting hole 12 and approach each other under the driving force of the threaded portion 1 31 and the threaded portion 2 33, so that the abutting portion 1 41 and the abutting portion 2 51 both abut against the side wall of the circular knife 2, thereby locking the circular knife 2;

[0076] In order to achieve that the locking block 14 and the locking block 2 5 are both relatively stationary with respect to the mounting hole 12 in the circumferential direction, the cross-sections of the mounting hole 12, the locking block 14 and the locking block 2 5 are all rectangular, and other anti-rotation structures can also be adopted (for example, the cross-sections of the mounting hole 12, the locking block 14 and the locking block 2 5 are all elliptical, triangular or pentagonal, etc.), so that the locking block 1 4 and the locking block 2 5 cannot rotate circumferentially in the mounting hole 12, and at the same time, it can ensure that the abutting portion 1 41 and the abutting portion 2 51 are arranged toward the side wall of the circular knife 2, ensuring that the abutting portion 1 41 and the abutting portion 2 51 can abut against the side wall of the circular knife 2.

[0077] Example 3:

[0078] The design of this embodiment is basically the same as that of the first embodiment, except that:

[0079] like Figure 7 , the locking mechanism includes: a locking rod 3 and a locking block 4;

[0080] The locking rod 3 is inserted into the mounting hole 12 and is provided with a second abutment portion 51 and a first threaded portion 31. That is, the second abutment portion 51 is provided on the locking rod 3, that is, the second abutment portion 51 is a part of the locking rod 3.

[0081] The locking block 4 is slidably disposed in the mounting hole 12 and is disposed on the locking rod 3. The locking block 4 has an abutment portion 41. The locking block 4 is provided with a threaded hole 42. The threaded portion 31 is threadedly connected to the threaded hole 42. The locking block 4 and the mounting hole 12 are relatively stationary in the circumferential direction.

[0082] By rotating the locking rod 3, the locking rod 3 and the second abutting portion 51 rotate in the mounting hole 12, and under the cooperation of the threaded portion 1 31 and the threaded hole 1 42, the abutting portion 1 41 of the locking block 1 4 is close to the second abutting portion 51, and the abutting portion 1 41 and the abutting portion 2 51 both abut the side wall of the circular knife 2, thereby locking and fixing the circular knife 2;

[0083] The abutment portion 51 is an axially symmetrical structure, that is, the locking rod 3 is circumferentially provided with the abutment portion 51 to ensure the rotation of the abutment portion 51 in the mounting hole 12, and when the locking rod 3 rotates along the axis of the locking rod 3 in the mounting hole 12, the abutment portion 51 can ensure abutment with the circular knife 2.

[0084] Example 4:

[0085] The design of this embodiment is basically the same as that of the third embodiment, except that:

[0086] The locking mechanism further includes: a second locking block 5 , which is integrally formed on the locking rod 3 , and the second locking block 5 has the second abutting portion 51 .

[0087] In the above embodiments 1 to 4, the locking block 1 4 is arranged at the middle position of the locking rod 3, and the locking block 2 5 (or the abutment portion 2 51) is arranged at the end of the locking rod 3. In practice, the locking block 1 4 can also be arranged at the end of the locking rod 3, and the locking block 2 5 (or the abutment portion 2 51) can be arranged at the middle position of the locking rod 3, and the corresponding structure can be changed accordingly.

[0088] The above shows and describes the basic principles and main features of the present technical solution and the advantages of the present technical solution. Those skilled in the art should understand that the present technical solution is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present technical solution. Various changes and improvements may be made to the present technical solution without departing from the spirit and scope of the present technical solution. Such changes and improvements fall within the scope of the present technical solution for which protection is sought. The scope of protection claimed by the present technical solution is defined by the appended claims and their equivalents.

[0089] It should be noted that the structures, proportions, sizes, etc. depicted in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions for the implementation of this technical solution. Therefore, they have no substantial technical significance. Any modification of the structure, change in the proportional relationship or adjustment of the size, without affecting the efficacy and purpose that can be achieved by this technical solution, should still fall within the scope of the technical content disclosed by this technical solution. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit the scope of the implementation of this technical solution. Changes or adjustments in their relative relationships, without substantially changing the technical content, should also be regarded as the scope of the implementation of this technical solution.

[0090] It should also be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element through an intervening element.

[0091] In addition, the descriptions of "first", "second", etc. in this application are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

Claims

1. A circular knife locking device for a cutting machine, characterized in that: include: A fixing seat (1) is provided with a mounting cavity (11) and a mounting hole (12), and the inner side wall of the mounting hole (12) is connected to the side wall of the mounting cavity (11) through an opening (13); A circular knife (2) is installed in the installation cavity (11), and the side wall of the circular knife (2) extends into the installation hole (12) through the opening (13); a locking mechanism, which is installed in the mounting hole (12), and the locking mechanism is in movably contact with the side wall of the circular knife (2), and is used to fix the circular knife (2) in the mounting cavity (11); Wherein, the locking mechanism includes: A locking rod (3) is inserted into the mounting hole (12), and the locking rod (3) is provided with a second abutment portion (51); A locking block (4) is slidably disposed in the mounting hole (12) and disposed on the locking rod (3), and the locking block (4) has an abutment portion (41); The locking block 1 (4) is driven by the locking rod (3) to slide in the mounting hole (12), so that the abutting portion 1 (41) and the abutting portion 2 (51) approach each other and abut against the side wall of the circular knife (2), thereby achieving the installation of the circular knife (2) in the mounting cavity (11).

2. The circular blade locking device of a cutting machine according to claim 1, characterized in that: The locking mechanism further comprises: A second locking block (5) is slidably disposed in the mounting hole (12) and disposed on the locking rod (3), and the second locking block (5) has the second abutting portion (51); The locking block 1 (4) and the locking block 2 (5) are driven toward each other by the locking rod (3), so that the abutting portion 1 (41) and the abutting portion 2 (51) both abut against the side wall of the circular knife (2), thereby enabling the circular knife (2) to be installed in the installation cavity (11).

3. The circular blade locking device of a cutting machine according to claim 2, characterized in that: The locking rod (3) is provided with a threaded portion (31) and a limiting portion (32); the locking block (4) is provided with a threaded hole (42), the threaded portion (31) is threadedly connected to the threaded hole (42), and the locking block (4) and the mounting hole (12) are relatively stationary in the circumferential direction; The locking block 2 (5) is sleeved on the locking rod (3), and the limiting portion (32) movably abuts against the locking block 2 (5) to limit the movement of the locking block 2 (5) in a direction away from the locking block 1 (4).

4. The circular blade locking device of a cutting machine according to claim 2, characterized in that: The locking rod (3) is provided with a first threaded portion (31) and a second threaded portion (33), and the thread directions of the first threaded portion (31) and the second threaded portion (33) are opposite; The locking block 1 (4) is provided with a threaded hole 1 (42), and the threaded portion 1 (31) is threadedly connected to the threaded hole 1 (42); The second locking block (5) is provided with a second threaded hole (52), and the second threaded portion (33) is threadedly connected to the second threaded hole (52); The locking block 1 (4) and the locking block 2 (5) are both relatively stationary with respect to the mounting hole (12) in the circumferential direction.

5. The circular blade locking device of a cutting machine according to claim 2, characterized in that: The second locking block (5) is integrally formed on the locking rod (3).

6. A circular knife locking device for a cutting machine according to claim 1 or 5, characterized in that: The locking rod (3) is provided with a threaded portion 1 (31), and the locking block 1 (4) is provided with a threaded hole 1 (42). The threaded portion 1 (31) is threadedly connected to the threaded hole 1 (42), and the locking block 1 (4) and the mounting hole (12) are relatively stationary in the circumferential direction.

7. A circular blade locking device for a cutting machine according to any one of claims 1 to 5, characterized in that: The abutting portion 1 (41) and the abutting portion 2 (51) are arc-shaped structures.

8. The circular blade locking device of a cutting machine according to any one of claims 1 to 5, characterized in that: A limiting platform (34) is provided on the locking rod (3), and the limiting platform (34) is in movably contact with the locking block 1 (4) to limit the movement of the locking block 1 (4) toward the direction close to the contact portion 2 (51).

9. The circular blade locking device of a cutting machine according to claim 1, characterized in that: A boss (14) is provided on the end edge of the fixing seat (1).

10. A circular knife locking device for a cutting machine according to claim 1, 2, 3, 4, 5 or 9, characterized in that: A through hole 1 (15) and a through hole 2 (16) are respectively provided at both ends of the fixing seat (1), and both the through hole 1 (15) and the through hole 2 (16) are connected to the mounting cavity (11). A protrusion (17) is provided on the inner wall of the through hole 2 (16), and the protrusion (17) movably abuts against the rear end of the circular knife (2).

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