Plasma knife with knife head provided with double-locking structure
By introducing a double-locking structure into the plasma knife, the problem of poor connection stability between the blade tip and the handle is solved, achieving a stable connection between the blade tip and the handle and convenient replacement.
Patent Information
- Application Number
- CN202422965120.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-03
- Publication Date
- 2025-12-16
- Estimated Expiration
- 2034-12-03
AI Technical Summary
Existing plasma scalpel tip replacement devices typically have only one locking mechanism, resulting in poor connection stability between the tip and the handle.
A plasma knife with a double-locking structure was designed. The double locking is achieved through the cooperation between the first and third connectors and the second and fourth connectors, making the connection between the plasma knife tip and the handle more stable.
This design achieves a secure connection between the cutter head and the handle, while also facilitating quick cutter head replacement and improving the stability and reliability of the replacement process.
Smart Images
Figure CN223668045U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of medical apparatus and instruments, especially to a plasma knife with double locking structure of cutter head. BACKGROUND
[0002] At present, plasma knives are often used to cut human tissues in surgical operations, and the plasma knives use plasma technology to accurately and efficiently cut, coagulate and evaporate tissues by generating high-energy plasma, and compared with traditional steel surgical knives, the plasma knives have the advantages of high precision, no contact, less bleeding and faster recovery.
[0003] At present, in the plasma knives, different specifications of cutter heads are needed to cope with different surgical positions, so the cutter heads of the current plasma knife products can be replaced.
[0004] However, in the existing plasma knives with replaceable cutter heads, the cutter head replacement device usually has only one locking structure, and the connection stability of the cutter head and the handle is poor. UTILITY MODEL CONTENTS
[0005] In view of the problems existing in the prior art, the utility model aims to provide a plasma knife with double locking structure of cutter head, which facilitates quick replacement of the cutter head.
[0006] The utility model achieves the above-mentioned purpose through the following technical scheme:
[0007] A plasma knife with double locking structure of cutter head comprises a handle part and an electrode part, the handle part is connected with a first connecting part, the electrode part is connected with a second connecting part, and the first connecting part and the second connecting part are matched; the first connecting part comprises a first body, a first connecting piece connected with the first body and a second connecting piece connected with the first body, the second connecting part comprises a second body, a third connecting piece connected with the second body and a fourth connecting piece connected with the second body, the first connecting piece is matched with the third connecting piece, and the second connecting piece is matched with the fourth connecting piece.
[0008] Further, the handle part comprises a handle body and a fifth connecting piece connected with the handle body, the first connecting part further comprises a sixth connecting piece matched with the fifth connecting piece, the sixth connecting piece is connected with the first body, and the first connecting piece is connected with the sixth connecting piece.
[0009] Still further, the sixth connecting piece is a threaded piece arranged around the first body, and the fifth connecting piece is a threaded hole.
[0010] Further, the first body is cylindrical, the second connecting member is a protrusion connected with the outer wall of the first body, the second body is internally provided with a cylindrical groove matched with the first body, the fourth connecting member is a straight slot and a limiting slot provided on the side wall of the cylindrical groove, the straight slot and the limiting slot are mutually communicated and are L-shaped, the straight slot extends to one end of the second body towards the first connecting part, and the protrusion enters the limiting slot through the straight slot.
[0011] Further, the first connecting member is a groove recessed downward on one side of the threaded member towards the second connecting part, the third connecting member comprises a telescopic block moving towards the direction of the groove, and the telescopic block is matched with the groove.
[0012] Further, the telescopic block comprises an extending block and a driving block connected with the extending block, the extending block is used for matching with the groove, the second body is internally provided with a containing cavity, the outer surface of the second body is provided with a first hole and a second hole communicated with the containing cavity, the driving block is arranged in the containing cavity, the extending block extends out of the outer surface of the second body through the first hole, a spring is connected between the driving block away from one side of the first hole and the inner wall of the containing cavity, and a first inclined surface is arranged on the driving block; the third connecting member further comprises a button rod, one end of the button rod extends out of the outer surface of the second body through the second hole, and the other end of the button rod is provided with a second inclined surface matched with the first inclined surface.
[0013] Further, the electrode part is internally provided with a first channel penetrating through the electrode part, the second body is internally provided with a second channel and a third channel, one end of the second channel and one end of the third channel extend to the outer surface of the second body, the second channel and the third channel are mutually communicated, and the second channel is communicated with the first channel; the device further comprises a suction pipe, the suction pipe enters the first channel through the third channel and the second channel in sequence.
[0014] Further, the electrode part is cylindrical, the second body comprises a cylindrical part and a conical block, two ends of the conical block are connected with the electrode part and the cylindrical part respectively, the electrode part, the conical block and the cylindrical part are coaxially arranged, and the conical end of the conical block is arranged towards the electrode part.
[0015] Further, the first connecting part is internally provided with a first electric connecting member, the second connecting part is internally provided with a second electric connecting member matched with the first electric connecting member, the electrode part comprises an electrode, the handle part comprises an electric control unit, the first electric connecting member is electrically connected with the electric control unit, and the second electric connecting member is electrically connected with the electrode.
[0016] Further, the second body surface is provided with a sliding groove, and the telescopic block is arranged in the sliding groove, and the sliding groove extends to one end of the second body towards the first connecting part.
[0017] Compared with the prior art, the utility model has the advantages that through the setting of the first connecting piece and the third connecting piece and the setting of the second connecting piece and the fourth connecting piece, when the plasma knife head and the handle are connected, the double locking between the first connecting piece and the third connecting piece and the second connecting piece and the fourth connecting piece makes the plasma knife head convenient to replace and the knife head and the handle firmly connected. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 It is the three-dimensional schematic view of the plasma knife with the double locking structure of the knife head of the utility model;
[0019] Figure 2 It is the partial sectional view of the plasma knife with the double locking structure of the knife head of the utility model;
[0020] Figure 3 It is Figure 2 Method schematic view of A part in it;
[0021] Figure 4 It is the first three-dimensional schematic view of the first connecting part and the second connecting part of the utility model;
[0022] Figure 5 It is the second three-dimensional schematic view of the first connecting part and the second connecting part of the utility model;
[0023] Figure 6 It is the third three-dimensional schematic view of the second connecting part of the utility model;
[0024] Figure 7 It is the telescopic structure schematic view of the telescopic block of the utility model.
[0025] In the drawing:
[0026] 1 - electrode part;2 - first connecting part;2a - first body;2b - threaded part;2c - protruding block;2d - recess;3 - second connecting part;3a - second body;3aa - conical block;3ab - cylindrical part;3b - straight slot;3c - limiting slot;3d - telescopic block;3da - telescopic block;3db - driving block;3e - accommodating cavity;3f - button rod;3g - second channel;3h - third channel;4a - handle body;4b - threaded hole;5 - suction pipe;6a - first electric connecting piece;6b - second electric connecting piece. DETAILED DESCRIPTION
[0027] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.
[0028] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.
[0029] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances. In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.
[0030] In order to solve the problem that the plasma knife head can be stably connected with the handle after replacement, the utility model discloses a plasma knife with double locking structure of knife head. Figures 1 to 5 As shown in the utility model discloses a plasma knife with double locking structure of knife head, including handle part and electrode part 1, the first connecting part 2 is connected on the handle part, the second connecting part 3 is connected on the electrode part 1, the first connecting part 2 and the second connecting part 3 cooperate, that is, the first connecting part 2 and the second connecting part 3 are detachably connected. In actual use, the electrode part 1 and the second connecting part 3 form a knife head assembly, and the handle part and the first connecting part 2 form a handle assembly. The handle assembly is provided with one, and the knife head assembly has a plurality of, the structures of the second connecting part 3 are the same among the knife head assemblies, and the structures of the electrode part 1 are different among the electrode parts 1. Therefore, by replacing different knife head assemblies and combining with the handle assembly, the knife head of the plasma knife is realized. In the utility model, in order to better connect the first connecting part 2 and the second connecting part 3, as shown in the utility model discloses a plasma knife with double locking structure of knife head, including handle part and electrode part 1, the first connecting part 2 is connected on the handle part, the second connecting part 3 is connected on the electrode part 1, the first connecting part 2 and the second connecting part 3 cooperate, that is, the first connecting part 2 and the second connecting part 3 are detachably connected. In actual use, the electrode part 1 and the second connecting part 3 form a knife head assembly, and the handle part and the first connecting part 2 form a handle assembly. The handle assembly is provided with one, and the knife head assembly has a plurality of, the structures of the second connecting part 3 are the same among the knife head assemblies, and the structures of the electrode part 1 are different among the electrode parts 1. Therefore, by replacing different knife head assemblies and combining with the handle assembly, the knife head of the plasma knife is realized. In the utility model, in order to better connect the first connecting part 2 and the second connecting part 3, Figure 4 And Figure 5As shown, the first connecting part 2 includes a first body 2a, a first connecting member connected to the first body 2a, and a second connecting member connected to the first body 2a. The second connecting part 3 includes a second body 3a, a third connecting member connected to the second body 3a, and a fourth connecting member connected to the second body 3a. The first connecting member and the third connecting member cooperate, and the second connecting member and the fourth connecting member cooperate. That is, the first connecting member and the third connecting member are detachably connected, and the second connecting member and the fourth connecting member are detachably connected. Through the mutually cooperating first and third connecting members, and the mutually cooperating second and fourth connecting members, when the plasma scalpel tip and the handle are connected, the double locking between the first and third connecting members, and between the second and fourth connecting members, makes it easy to replace the plasma scalpel tip while ensuring a secure connection between the tip and the handle.
[0031] The plasma cutter of this utility model has a double-locking structure. The cooperation forms of the first and third connecting members, and the cooperation forms of the second and fourth connecting members, have many embodiments. The following describes in detail one embodiment of each of these features, including the cooperation form of the first and third connecting members. This embodiment is referred to as the "this embodiment." Other embodiments of these features are referred to as "other embodiments," which are briefly described below.
[0032] In this embodiment, as Figures 1 to 5 As shown, the handle portion includes a handle body 4a and a fifth connector connected to the handle body 4a. The first connecting portion 2 also includes a sixth connector that mates with the fifth connector. The sixth connector is connected to the first body 2a, and the first connector is connected to the sixth connector. This invention, by placing the first connector on the sixth connector connecting the first connecting portion 2 and the handle body 4a, makes the first connecting portion 2 and the second connecting portion 3 more compact, helping to reduce the volume of the first connecting portion 2 and the second connecting portion 3. In other embodiments, the first connector and the sixth connector can also be completely separate and independently disposed, which facilitates the manufacturing of the first connecting portion 2 and the second connecting portion 3.
[0033] In this embodiment, as Figures 3 to 5 As shown, the sixth connector is a threaded member 2b surrounding the first body 2a, and the fifth connector is a threaded hole 4b, with the internal thread of the threaded hole 4b engaging with the external thread of the threaded member 2b. During the assembly and connection of the first connecting part 2 and the handle part, the threaded member 2b is screwed into the threaded hole 4b, completing the connection between the first connecting part 2 and the handle part. Simultaneously, to facilitate the connection between the first connector and the third connector on the threaded member 2b, the first connector is positioned on the side of the threaded member 2b facing the second connecting part 3. In other embodiments, the fifth connector and the sixth connector can also be connected using a connector plug.
[0034] In the embodiment, as shown in the figure, Figures 4 to 6 The first body 2a is in a cylindrical shape, the second connecting member is a protrusion 2c connected to the outer wall of the first body 2a, the threaded member 2b is arranged around the outer wall of the first body 2a, and the threaded member 2b is coaxial with the first body 2a. The protrusion 2c is arranged on the side of the threaded member 2b facing the second connecting part 3, so when the threaded member 2b is screwed into the threaded hole 4b, the protrusion 2c is arranged on the side of the threaded member 2b away from the handle body 4a. The second body 3a is internally provided with a cylindrical groove matched with the first body 2a, and the fourth connecting member is a straight groove 3b and a limiting groove 3c arranged on the side wall of the cylindrical groove. The straight groove 3b and the limiting groove 3c are in communication with each other, and the axis of the straight groove 3b and the axis of the limiting groove 3c are arranged obliquely. In the embodiment, the straight groove 3b and the limiting groove 3c combine to form an L-shaped groove. At the same time, the straight groove 3b extends to the end of the second body 3a facing the first connecting part 2. During the cooperation of the second connecting member and the fourth connecting member, the protrusion 2c enters the limiting groove 3c through the straight groove 3b. Specifically, during the cooperation of the second connecting member and the fourth connecting member, the protrusion 2c is aligned with the straight groove 3b, the first body 2a is moved towards the cylindrical groove, and at the same time the protrusion 2c is moved in the straight groove 3b. When the protrusion 2c moves to the intersection of the limiting groove 3c and the straight groove 3b, the second body 3a is rotated, so that the second body 3a and the first body 2a are relatively rotated. The protrusion 2c is rotated into the limiting groove 3c, and thus the cooperation between the second connecting member and the fourth connecting member is completed, so that the first connecting part 2 and the second connecting part 3 are limited in the direction of approaching or moving away from each other, forming the first lock between the tool bit assembly and the handle assembly.
[0035] In the embodiment, as shown in the figure, Figures 4 to 6 The first connecting member is a groove 2d arranged on the side of the threaded member 2b facing the second connecting part 3, and the third connecting member includes an extension block 3d moving towards the groove 2d, and the extension block 3d cooperates with the groove 2d. During the assembly of the first connecting part 2 and the second connecting part 3, the extension block 3d is first moved away from the groove 2d, so that the extension block 3d cannot be connected with the groove 2d, and at this time the extension block 3d is misaligned with the groove 2d. The first body 2a is rotated to rotate the protrusion 2c into the limiting groove 3c, that is, the cooperation between the second connecting member and the fourth connecting member is completed. At this time, the line connecting the extension block 3d and the groove 2d is parallel to the axis of the first body 2a, that is, the extension block 3d can be aligned with the groove 2d, and then the extension block 3d is driven to move towards the groove 2d, so that the extension block 3d enters the groove 2d, and the extension block 3d cooperates with the groove 2d, so that the second body 3a and the first body 2a cannot be relatively rotated, forming the second lock between the tool bit assembly and the handle assembly. At this time, the tool bit assembly and the handle assembly cannot be separated from each other and cannot be rotated relative to each other, and the connection between the tool bit assembly and the handle assembly is stable.
[0036] In other embodiments, the matching form of the first connecting piece and the third connecting piece, and the matching form of the second connecting piece and the fourth connecting piece can be:
[0037] a. The second connecting piece and the fourth connecting piece adopt the matching mode of the embodiment, and the first connecting piece and the third connecting piece can adopt the matching of the magnet and the metal piece.
[0038] b. The first connecting piece and the third connecting piece can adopt the matching mode of the embodiment, and the second connecting piece and the fourth connecting piece adopt the matching of the bolt and the threaded hole.
[0039] c. The matching form of the first connecting piece and the third connecting piece, and the matching form of the second connecting piece and the fourth connecting piece do not adopt the mode of the embodiment, and can be that the first connecting piece and the third connecting piece, and the second connecting piece and the fourth connecting piece all adopt the matching of the connector, and the double connector makes the connection between the tool bit assembly and the handle assembly more stable.
[0040] In the embodiment, as shown in Figure 7 The specific working principle of the telescopic block 3d is as follows. The telescopic block 3d includes an extension block 3da and a driving block 3db connected with the extension block 3da, the extension block 3da is used for matching with the groove 2d, the second body 3a is provided with a containing cavity 3e, the outer surface of the second body 3a is provided with a first hole and a second hole in communication with the containing cavity 3e, the driving block 3db is arranged in the containing cavity 3e, and the driving block 3db abuts against the lower surface of the containing cavity 3e. The extension block 3da extends out of the outer surface of the second body 3a through the first hole, a spring is connected between the driving block 3db away from the side of the first hole and the inner wall of the containing cavity 3e, and the driving block 3db is provided with a first inclined surface. The third connecting piece further includes a button rod 3f, the first inclined surface is arranged below the button rod 3f, Figure 7The downward direction in the button rod 3f is the gravity direction. One end of the button rod 3f extends out of the outer surface of the second body 3a through the second hole, and the other end of the button rod 3f is provided with a second inclined surface matched with the first inclined surface. The button rod 3f is affected by the gravity, and the second inclined surface abuts against the first inclined surface. The use method of the telescopic block 3d is as follows: when it is needed to retract the extension block 3da into the accommodating cavity 3e, the button rod 3f is pressed to move towards the accommodating cavity 3e, the second inclined surface moves relative to the first inclined surface, the driving block 3db is driven to move away from the first hole, the spring is compressed, and the extension block 3da is driven to move into the accommodating cavity 3e, so that the extension block 3da is retracted. When the extension block 3da needs to be extended, the button rod 3f is only released, the spring restores to the original state due to the absence of the pressure transmitted by the button rod 3f, the driving block 3db is driven to move towards the first hole, so that the extension block 3da is extended. In other embodiments, a sliding groove can be arranged on the surface of the second body 3a, the telescopic block 3d is arranged in the sliding groove, one end of the sliding groove extends to the end of the second body 3a towards the first connecting part 2, the telescopic block 3d can be completely retracted in the sliding groove, and the telescopic block 3d can be partially extended out of the sliding groove. In the use process, the telescopic block 3d is contacted by hand, so that the telescopic block 3d slides in the sliding groove, thereby controlling the extension and retraction of the telescopic block 3d.
[0041] In the embodiment, as shown in Figures 1 to 5 The first channel, the second channel 3g and the third channel 3h are arranged in the electrode part 1 and the second body 3a. One end of the second channel 3g and the third channel 3h extends to the outer surface of the second body 3a, the second channel 3g and the third channel 3h are communicated with each other, and the second channel 3g is communicated with the first channel. The plasma knife with the double locking structure further comprises a suction pipe 5, which is sequentially arranged in the third channel 3h, the second channel 3g and the first channel in the assembly process. The first channel, the second channel 3g and the third channel 3h are arranged in the electrode part 1 and the second body 3a, so that the suction pipe 5 is integrated in the tool head assembly. The blood generated in the process of cutting the human tissue by the plasma knife can be sucked out through the suction pipe 5 during the surgical cutting. In other embodiments, the suction pipe 5 can be omitted to save the cost.
[0042] In the embodiment, as shown in Figures 1 to 5As shown, the electrode part 1 is in a cylindrical shape, the second body 3a comprises a cylindrical part 3ab and a conical block 3aa, and two ends of the conical block 3aa are connected with the electrode part 1 and the cylindrical part 3ab respectively. The electrode part 1, the conical block 3aa and the cylindrical part 3ab are coaxially arranged, the conical end of the conical block 3aa is arranged towards the electrode part 1, and the sectional area of the radial section of the electrode part 1 is smaller than the sectional area of the radial section of the cylindrical part 3ab. Through the arrangement of the conical block 3aa, the connection between the second body 3a and the electrode part 1 is relatively continuous, and when the electrode part 1 is inserted into the human body, the damage to the human body during the operation is reduced. In other embodiments, the combination of the electrode part 1 and the second body 3a after being connected can be in a conical shape.
[0043] In the embodiment, as shown, Figures 1 to 5 The first connecting part 2 is provided with a first electric connecting part 6a, and the second connecting part 3 is provided with a second electric connecting part 6b matched with the first electric connecting part 6a. The electrode part 1 comprises an electrode, and the handle part further comprises an electric control unit arranged in the handle body 4a. The first electric connecting part 6a is electrically connected with the electric control unit, and the second electric connecting part 6b is electrically connected with the electrode. Therefore, when the first connecting part 2 is electrically connected with the second connecting part 3, the electric control unit is electrically connected with the electrode, and the electrode obtains electric energy after the electric control unit is powered on. Specifically, the first electric connecting part 6a is arranged in the first body 2a, and the second electric connecting part 6b is arranged in the second body 3a. Through the arrangement of the first electric connecting part 6a in the first body 2a and the arrangement of the second electric connecting part 6b in the second body 3a, the electric appliances such as the first electric connecting part 6a are effectively prevented from contacting with the human tissue during the operation, and the integrality of the plasma knife with the double locking structure is better and more beautiful. In other embodiments, in order to reduce the manufacturing difficulty, the first electric connecting part 6a can be arranged outside the first body 2a, and the second electric connecting part 6b can be arranged outside the second body 3a, but the electric appliances such as the first electric connecting part 6a need to be well insulated and protected.
[0044] In summary, the utility model discloses the setting of first connecting piece and third connecting piece and the setting of second connecting piece and fourth connecting piece are mutually matched, when the plasma knife head and handle are connected, through the double locking between first connecting piece and third connecting piece and second connecting piece and fourth connecting piece, make the plasma knife head convenient to replace, and the firm connection of knife head and handle. And through the first connecting piece is set on the sixth connecting piece that first connecting part 2 is connected with handle body 4a, make first connecting part 2 and second connecting part 3 connect compact. And through the setting of first channel, second channel 3g and third channel 3h, make the integration suction pipe 5 in knife head assembly. And through the setting of conical block 3aa, make the second body 3a and the connection of electrode part 1 relatively continuous. And through the first electric connecting piece 6a is set in first body 2a, and second electric connecting piece 6b is set in second body 3a, effectively prevent first electric connecting piece 6a and human body tissue contact during the operation of electric device.
[0045] It needs to be emphasized that: above is only the preferred embodiment of the utility model, and does not limit the utility model in any form, and any simple modification, equivalent change and modification of the above embodiment according to the technical essence of the utility model still belong to the range of the utility model technical scheme.
Claims
1. A plasma knife with double locking structure, comprising a handle part and an electrode part (1), a first connecting part (2) is connected to the handle part, a second connecting part (3) is connected to the electrode part (1), the first connecting part (2) and the second connecting part (3) are matched, characterized in that, The first connecting part (2) comprises a first body (2a), a first connecting piece connected with the first body (2a), and a second connecting piece connected with the first body (2a), the second connecting part (3) comprises a second body (3a), a third connecting piece connected with the second body (3a), and a fourth connecting piece connected with the second body (3a), the first connecting piece cooperates with the third connecting piece, and the second connecting piece cooperates with the fourth connecting piece.
2. The plasma knife with double locking structure of the knife head according to claim 1, characterized in that, The handle part comprises a handle body (4a) and a fifth connecting piece connected with the handle body (4a), the first connecting part (2) further comprises a sixth connecting piece matched with the fifth connecting piece, the sixth connecting piece is connected with the first body (2a), and the first connecting piece is connected with the sixth connecting piece.
3. The plasma knife with double locking structure of the knife head according to claim 2, characterized in that, The sixth connecting piece is a threaded piece (2b) arranged around the first body (2a), and the fifth connecting piece is a threaded hole (4b).
4. The plasma knife with double locking structure of the knife head according to claim 3, characterized in that, The first body (2a) is in a cylindrical shape, the second connecting piece is a protruding block (2c) connected with the outer wall of the first body (2a), the second body (3a) is internally provided with a cylindrical groove matched with the first body (2a), the fourth connecting piece is a straight groove (3b) and a limiting groove (3c) arranged on the side wall of the cylindrical groove, the straight groove (3b) and the limiting groove (3c) are in communication and in an L shape, the straight groove (3b) extends to one end of the second body (3a) facing the first connecting part (2), and the protruding block (2c) enters the limiting groove (3c) through the straight groove (3b).
5. The plasma knife with double locking structure of the tool head according to claim 4, characterized in that, The first connecting piece is a groove (2d) recessed downward on one side of the threaded piece (2b) facing the second connecting part (3), the third connecting piece comprises a telescopic block (3d) moving towards the groove (2d), and the telescopic block (3d) cooperates with the groove (2d).
6. The plasma knife with double locking structure of the tool head according to claim 5, characterized in that, The telescopic block (3d) comprises a protruding block (3da) and a driving block (3db) connected with the protruding block (3da), the protruding block (3da) is used for cooperating with the groove (2d), the second body (3a) is internally provided with an accommodating cavity (3e), the outer surface of the second body (3a) is provided with a first hole and a second hole in communication with the accommodating cavity (3e), the driving block (3db) is arranged in the accommodating cavity (3e), the protruding block (3da) extends out of the outer surface of the second body (3a) through the first hole, a spring is connected between the inner wall of the accommodating cavity (3e) and the side of the driving block (3db) away from the first hole, and a first inclined surface is arranged on the driving block (3db); the third connecting piece further comprises a button rod (3f), one end of the button rod (3f) extends out of the outer surface of the second body (3a) through the second hole, and the other end of the button rod (3f) is provided with a second inclined surface matched with the first inclined surface.
7. The plasma knife with double locking structure of the knife head according to claim 5, characterized in that, The electrode part (1) is provided with a first channel penetrating through the electrode part (1), the second body (3a) is provided with a second channel (3g) and a third channel (3h), one end of the second channel (3g) and the third channel (3h) extends to the outer surface of the second body (3a), the second channel (3g) and the third channel (3h) are communicated with each other, the second channel (3g) is communicated with the first channel; further comprising a suction tube (5), the suction tube (5) penetrates through the third channel (3h), the second channel (3g) in sequence and then enters the first channel.
8. The plasma knife with double locking structure of the knife head according to claim 1, characterized in that, The electrode part (1) is cylindrical, the second body (3a) includes a cylindrical part (3ab) and a conical block (3aa), both ends of the conical block (3aa) are connected with the electrode part (1) and the cylindrical part (3ab) respectively, the electrode part (1), the conical block (3aa) and the cylindrical part (3ab) are coaxially arranged, and the conical end of the conical block (3aa) is arranged towards the electrode part (1).
9. The plasma knife with double locking structure of the knife head according to claim 1, characterized in that, The first connecting part (2) is provided with a first electric connecting piece (6a), the second connecting part (3) is provided with a second electric connecting piece (6b) matched with the first electric connecting piece (6a), the electrode part (1) includes an electrode, the handle part includes an electric control unit, the first electric connecting piece (6a) is electrically connected with the electric control unit, and the second electric connecting piece (6b) is electrically connected with the electrode.
10. The plasma knife with the double locking structure of the tool head according to claim 5, characterized in that, The surface of the second body (3a) is provided with a sliding groove, the telescopic block (3d) is arranged in the sliding groove, and the sliding groove extends to one end of the second body (3a) towards the first connecting part (2).