CN212684029U - Pipe cutter - Google Patents

Abstract

The utility model discloses a pipe cutter, including the sword casing, with sword casing articulated tailors blade and limit structure, the sword casing is provided with and is used for leaning on the face of placing by the thing of tailorring, it is in under the open mode to tailor the blade, tailor the blade with place the face and mutually support and form and be used for placing the opening of tailorring of being tailor the thing, tailor the blade with limit structure offsets and leans on with the restriction tailor the open-ended maximum opening, tailor the blade with limit structure support to lean on the position adjustable. The utility model discloses a tailor the open-ended and tailor the adjustable pipe fitting that realizes easily tailorring different specifications of open-ended, its simple structure, convenient to use, labour saving and time saving most.

Description

Pipe cutter

Technical Field

The utility model relates to a cut out the pipe sword field, especially relate to a cut out pipe sword with adjustable maximum cutting opening.

Background

A pipe cutter (also known as a pipe cutter) is one of tools frequently used in piping engineering, mainly used for cutting and segmenting a pipe body, and widely applied to connecting and leading pipelines such as electric, water, gas and the like.

The traditional pipe cutter comprises a cutter shell, a cutting blade and a movable handle, wherein the movable handle can move relative to the cutter shell, and a ratchet wheel mechanism is formed by matching a push broach pawl in the movable handle with a ratchet wheel tooth groove of the cutting blade to drive the cutting blade to be closed for cutting; a cutter locking pawl clamped into a ratchet tooth groove is arranged on the cutter shell and used for preventing the cutting blade from reversely rotating when the cutting blade is closed; after one-time cutting is finished, the cutter locking pawl and the ratchet tooth groove are separated, and the cutting blade is reset and opened.

The pipe cutting knife cuts the pipe fittings with certain specifications, such as 42mm or less; the tube cutting knife on the market returns to the maximum cutting opening which cannot be changed (for example, the tube cutting knife can accommodate the cutting opening with the diameter of 42mm or less) when the cutting blade is reset every time; when a small-sized pipe needs to be cut (for example, a pipe with a diameter of 26 mm), an operator needs to press the movable handle in advance to rotate the cutting blade so as to reduce the cutting opening, so that the cutting blade can be used for cutting continuously after the cutting blade abuts against the pipe, and the pipe is difficult to cut quickly and effectively.

SUMMERY OF THE UTILITY MODEL

In order to overcome the not enough of existence among the prior art, the utility model provides a cut out tub sword is through cutting out the open-ended the biggest adjustable pipe fitting of realizing easily cutting out different specifications of tailorring the open-ended, its simple structure, convenient to use, labour saving and time saving.

In order to achieve the above purpose, the utility model adopts the following technical scheme to realize:

the utility model provides a cut out pipe sword, including the sword casing, with sword casing articulated cut out blade and limit structure, the sword casing is provided with and is used for leaning on the face of placing by the thing of cutting out, it is under the open mode to cut out the blade, cut out the blade with the face of placing mutually supports and forms the opening of cutting out that is used for placing by the thing of cutting out, cut out the blade with limit structure offsets and leans on in order to restrict cut out open-ended maximum opening, cut out the blade with limit structure's the position of leaning on is adjustable.

By adopting the structure, when the tube cutting knife is used, the cutting blade is reset, namely, the cutting blade is opened and is abutted against the limiting structure; placing a pipe fitting to be cut in a cutting opening formed by the cutting blade and the placing surface; and closing the cutting blade to cut the pipe fitting, namely rotating the cutting blade to the placing surface side.

Since the maximum opening of the cutting opening depends on the abutting position of the cutting blade and the limiting structure, the maximum opening of the cutting opening can be adjusted by adjusting the abutting position of the cutting blade and the limiting structure; the pipe that operating personnel can be tailor as required adjusts to lean on the position to reach can labour saving and time saving tailor the pipe fitting of different specifications.

Further, the limiting structure comprises a limiting piece used for abutting against the cutting blade and an adjusting structure which is matched with the limiting piece and used for changing the position of the limiting piece.

Adopt above-mentioned structure, the restriction piece with adjust the position adjustment that the structure was mutually supported and was realized the restriction piece, work as the position change back of restriction piece can change the restriction structure with the position that leans on of cutting out the blade.

The limiting member is in a pin-shaped structure, and the adjusting structure can be a sliding groove in which the limiting member slides to change the position of the limiting member.

Or, further, the cutting blade is provided with a limiting surface which is abutted against the limiting piece; the adjusting structure comprises at least two positioning holes arranged near the limiting surface; the limiting piece is arranged in one of the positioning holes and is abutted against the limiting surface of the cutting blade, and the center of at least one other positioning hole is not on the plane of the limiting surface.

By adopting the structure, before the cutting blade is reset, the limiting part is adjusted according to the specification of a pipe to be cut, namely the limiting part is taken out of one positioning hole and is placed into another positioning hole, the center of which is not positioned on the same limiting surface, so that the abutting position of the limiting structure and the cutting blade is changed; because the centers of the positioning holes are not on the same plane where the limiting surfaces are located, when the limiting part abuts against the cutting blade, the opening angles of the cutting blade are different, and the adjustment of the maximum opening of the cutting opening is realized.

Specifically, the positioning hole is formed in the knife housing.

Further, the sword casing include with the blade of tailorring is articulated and is provided with the fixed handle of the face of placing, with fixed handle articulated activity handle and with the blade of tailorring cooperatees with the drive the pivoted drive structure of blade of tailorring.

By adopting the structure, the movable handle is pressed to rotate relative to the fixed handle, and part of the driving structure arranged on the movable handle moves along with the movable handle to drive the cutting blade.

Specifically, the positioning hole is formed in the fixed handle.

Further, the cutting blade is provided with a ratchet tooth groove; the driving structure comprises a cutter locking pawl hinged with the fixed handle and matched with the ratchet tooth groove, and a cutter pushing pawl hinged with the movable handle and matched with the ratchet tooth groove.

The push broach pawl comprises push broach teeth, and the lock broach pawl comprises lock broach teeth.

By adopting the structure, the ratchet tooth groove, the cutter locking pawl and the cutter pushing pawl form a ratchet structure; pressing the movable handle, enabling the push broach pawl to move towards the cutting blade, and enabling the push broach pawl to drag the cutting blade to rotate to enable the cutting blade to be closed to cut the pipe fitting as the push broach teeth of the push broach pawl are clamped into the ratchet tooth grooves; and when the movable handle is loosened, the movable handle rebounds and drives the push broach teeth of the push broach pawl to move to the adjacent ratchet wheel tooth grooves, and then the next round of push broach action can be carried out.

The cutter locking teeth of the cutter locking pawl are clamped into the ratchet tooth grooves, so that the cutting blade is prevented from reversely rotating when being closed for cutting.

Further, the tube cutter includes a blade return that acts on the cutting blade and causes the cutting blade to have a tendency to move into abutment with the limiting structure.

The cutting blade is provided with a cutting blade connecting hole, and the fixed handle is provided with a cutting blade connecting hole; the blade reset piece one end with reset a spliced pole and be connected, the other end through the couple with reset a connecting hole and be connected.

By adopting the structure, when the cutter locking pawl is separated from the ratchet tooth groove, the cutting blade is rotated towards the direction of opening the cutting blade (namely, away from the placing surface) under the action of the blade resetting piece until the cutting blade abuts against the limiting structure to stop rotating.

Further, pipe cutter includes lock sword reset piece, lock sword reset piece acts on lock sword pawl and makes lock sword pawl have the tendency of going into ratchet tooth's socket.

The lock cutter resetting piece is an elastic piece, a resetting piece connecting groove is formed in the lock cutter pawl, and a resetting piece connecting column is arranged on the fixed handle; one end of the locking knife resetting piece is connected with the resetting piece connecting column, and the other end of the locking knife resetting piece is connected with the resetting piece connecting groove through a hook.

By adopting the structure, under the state without other external force, the lock cutter resetting piece acts on the lock cutter pawl and enables the lock cutter teeth to be clamped into the ratchet wheel tooth grooves all the time to prevent the cutting blade from reversing in the closed cutting state.

The blade reset piece and the lock knife reset piece are integrated, so that a reset piece connecting column for connecting the blade reset piece and a reset piece connecting column for connecting the lock knife reset piece are the same reset piece connecting column; specifically, a torsion spring is sleeved on the reset piece connecting column, one connecting pin of the torsion spring extends towards the cutting blade and is connected with the reset piece connecting hole to form a blade reset piece; and the other connecting foot of the torsion spring extends towards the lock knife pawl and is connected with the reset connecting groove to form a lock knife reset piece.

Furthermore, the cutting blade is inwards recessed towards the side of the limiting structure to form an avoiding area, and a limiting surface matched with the limiting structure is formed on the side surface, facing the limiting structure, of the cutting blade.

Adopt above-mentioned structure, set up dodge the district, make when cutting out the blade and opening, can rotate behind the bigger angle just with limit structure supports and leans on the stall, has improved promptly cut out the open-ended maximum open-ended upper limit to satisfy the pipe fitting of bigger diameter.

Further, the placing surface is inwards sunken to form a blade groove matched with the cutting blade.

By adopting the structure, when the cutting blade is closed, the blade groove can continue to rotate after the cutting edge of the cutting blade is leveled with the placing surface, so that the cutting edge of the cutting blade enters the blade groove; since the pipe member is placed on the placement surface, the cutting blade can further cut the pipe member completely when the cutting edge of the cutting blade enters the blade groove.

Furthermore, the positioning holes comprise a first positioning hole and a second positioning hole, the limiting piece is arranged in the first positioning hole and is abutted against the cutting blade, the maximum opening of the cutting opening can be used for placing an object to be cut with the diameter not more than phi 1, and the center of the second positioning hole is not on the plane of the limiting surface; the limiting piece is arranged in the second positioning hole and is abutted against the cutting blade, the maximum opening of the cutting opening can be used for placing an object to be cut with the diameter not more than phi 2, and the center of the first positioning hole is not positioned on the plane of the limiting surface; said phi 1 is substantially larger than said phi 2.

By adopting the structure, the maximum opening of the cutting opening is selected by two gears by arranging the two positioning holes, and when the limiting part is arranged in the first positioning hole, the pipe cutting knife is suitable for cutting a pipe fitting with a larger diameter; when the limiting part is placed in the second positioning hole, the pipe cutting knife is suitable for cutting a pipe fitting with a smaller diameter.

Specifically, the value of phi 1 is 42mm, and the value of phi 2 is 26 mm.

Further, the cutting blade comprises a first cutting edge and a second cutting edge which are connected in such a way, the first cutting edge and the second cutting edge are arranged at an angle, and a sharp knife part is formed at the connection position.

By adopting the structure, when the cutting blade is used for cutting in a closed mode, the sharp knife part can be used for puncturing the pipe fitting, and cutting is convenient.

Compared with the prior art, the utility model discloses following beneficial effect has:

(1) the utility model discloses a cut out tub sword leans on the position adjustable realization through cutting out blade and limit structure, and it is adjustable to cut out the open-ended biggest opening, can easily cut out the pipe fitting of different specifications.

(2) The utility model discloses a pipe cutter realizes leaning on the adjustable of position, simple structure through the form that sets up restriction piece and locating hole.

Drawings

FIG. 1 is a schematic perspective view of a pipe cutter of the present invention;

FIG. 2 is an exploded view of the pipe cutter of the present invention;

FIG. 3 is a schematic view of a fitting structure between a position-limiting member and a first positioning hole of the pipe cutter of the present invention;

FIG. 4 is a schematic view of a fitting structure between a limiting member and a second positioning hole of the pipe cutter of the present invention;

reference numerals: 1, a cutter shell; 101 a placing surface; 102 fixing a handle; 1021 restoring element connecting element; 103 movable handles; 104 an insert pocket; 2 cutting a blade; 201 a limiting surface; 202 ratchet tooth grooves; 203, an avoidance area; 204 reset piece connecting hole; 205 a first blade edge; 206 a second blade edge; 207 a sharp blade portion; 3 a confinement structure; 301 a limiting member; 302 an adjustment mechanism; 3021 positioning holes; 3021a first positioning hole; 3021b second positioning holes; 4, cutting an opening; 5 a drive structure; 501, locking a cutter pawl; 5011 locking cutter teeth; 5012 a reset piece connecting groove; 502 a push pawl; 5021 pushing teeth; 6 blade reset pieces; 7 locking knife reset piece.

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

As shown in fig. 1 to 4, a pipe cutting knife includes a knife housing 1, a cutting blade 2 hinged to the knife housing 1, and a limiting structure 3, the knife housing 1 is provided with a placing surface 101 for abutting against an object to be cut, the cutting blade 2 is in an open state, the cutting blade 2 and the placing surface 101 cooperate with each other and form a cutting opening 4 for placing the object to be cut, the cutting blade 2 abuts against the limiting structure 3 to limit a maximum opening of the cutting opening 4, and abutting positions of the cutting blade 2 and the limiting structure 3 are adjustable.

By adopting the structure, when the tube cutter is used, the cutting blade 2 is reset, namely the cutting blade 2 is opened and is abutted against the limiting structure 3; placing a pipe to be cut in a cutting opening 4 formed by the cutting blade 2 and the placing surface 101; the cutting blade 2 is closed to cut the pipe, that is, the cutting blade 2 is rotated toward the mounting surface 101.

Since the maximum opening of the cutting opening 4 depends on the abutting position of the cutting blade 2 and the limiting structure 3, the maximum opening of the cutting opening 4 can be adjusted by adjusting the abutting position of the cutting blade 2 and the limiting structure 3; the pipe that operating personnel can be tailor as required adjusts to lean on the position to reach can labour saving and time saving tailor the pipe fitting of different specifications.

Preferably, the limiting structure 3 comprises a limiting member 301 for abutting against the cutting blade 2, and an adjusting structure 302 cooperating with the limiting member 301 and for changing the position of the limiting member 301.

With the structure, the limiting piece 301 and the adjusting structure 302 are matched with each other to realize the position adjustment of the limiting piece 301, and after the position of the limiting piece 301 is changed, the abutting position of the limiting structure 3 and the cutting blade 2 can be changed.

The limiting member 301 is a pin-shaped structure, and the adjusting structure 302 can be a sliding groove, and the limiting member 301 slides in the sliding groove to change the position of the limiting member 301.

Alternatively, it is preferable that the cutting blade 2 is provided with a restriction surface 201 abutting against the restriction member 301; the adjustment structure 302 includes at least two positioning holes 3021 disposed near the limiting surface 201; when the restriction member 301 is placed in one of the positioning holes 3021 and abuts against the restriction surface 201 of the cutting blade 2, the center of at least one other positioning hole 3021 is not on the plane of the restriction surface 201.

With the above structure, before the cutting blade 2 is reset, the limiting member 301 is adjusted according to the specification of the pipe to be cut, that is, the limiting member 301 is taken out from one positioning hole 3021 and put into another positioning hole 3021 which is not located on the same limiting surface 201 at the center, so that the abutting position of the limiting structure 3 and the cutting blade 2 is changed; because the centers of the positioning holes 3021 are not on the same plane where the limiting surfaces 201 are located, when the limiting piece 301 abuts against the cutting blade 2, the opening angles of the cutting blade 2 are different, and the adjustment of the maximum opening of the cutting opening 4 is realized.

Specifically, the positioning hole 3021 is disposed on the knife housing 1.

Preferably, the knife housing 1 includes a fixed handle 102 hinged to the cutting blade 2 and provided with the placing surface 101, a movable handle 103 hinged to the fixed handle 102, and a driving structure 5 cooperating with the cutting blade 2 to drive the cutting blade 2 to rotate.

With the above structure, the movable handle 103 is pressed to rotate with respect to the fixed handle 102, and the driving structure 5 partially provided on the movable handle 103 is moved therewith to drive the cutting blade 2.

Specifically, the positioning hole 3021 is disposed on the fixed handle 102.

Preferably, the cutting blade 2 is provided with a ratchet tooth slot 202; the driving structure 5 comprises a blade locking pawl 501 hinged with the fixed handle 102 and matched with the ratchet tooth groove 202, and a blade pushing pawl 502 hinged with the movable handle 103 and matched with the ratchet tooth groove 202.

The pusher pawl 502 includes pusher teeth 5021 and the locker pawl 501 includes locker teeth 5011.

By adopting the structure, the ratchet tooth groove 202, the cutter locking pawl 501 and the cutter pushing pawl 502 form a ratchet structure; when the movable handle 103 is pressed, the push broach pawl 502 moves towards the cutting blade 2, and as the broach teeth 5021 of the push broach pawl 502 are clamped in the ratchet tooth groove 202, the push broach pawl 502 drags the cutting blade 2 to rotate, so that the cutting blade is closed to cut the pipe fittings; when the movable handle 103 is loosened, the movable handle 103 rebounds and drives the push broach teeth 5021 of the push broach pawl 502 to move into the adjacent ratchet tooth groove 202, and then the next push broach action can be performed.

The cutter locking teeth 5011 of the cutter locking pawl 501 are clamped in the ratchet tooth grooves 202 to prevent the cutting blade 2 from reversely rotating when the cutting blade 2 is closed for cutting.

Preferably, the pipe cutter comprises a blade return 6, said blade return 6 acting on the cutting blade 2 and giving the cutting blade 2 a tendency to move against the limiting structure 3.

The blade reset piece 6 is an elastic piece, the cutting blade 2 is provided with a reset piece connecting hole 204, and the fixed handle 102 is provided with a reset piece connecting column 1021; one end of the blade reset piece 6 is connected with the reset piece connecting column 1021, and the other end is connected with the reset piece connecting hole 204 through a hook.

With the above structure, when the blade locking pawl 501 is disengaged from the ratchet tooth groove 202, the cutting blade 2 is rotated in a direction of opening the cutting blade 2 (i.e., away from the placing surface 101) by the blade returning member 6 until the cutting blade 2 abuts against the limiting structure 3 to stop rotating.

Preferably, the pipe cutter comprises a knife return 7, said knife return 7 acting on said knife pawl 501 and causing said knife pawl 501 to have a tendency to snap into said ratchet tooth slot 202.

The cutter locking reset piece 7 is an elastic piece, a reset piece connecting groove 5012 is formed in the cutter locking pawl 501, and a reset piece connecting column 1021 is formed in the fixed handle 102; one end of the locking knife resetting piece 7 is connected with the resetting piece connecting column 1021, and the other end of the locking knife resetting piece is connected with the resetting piece connecting groove 5012 through a hook.

With the above structure, in the state without other external force, the cutter locking reset piece 7 acts on the cutter locking pawl 501 and enables the cutter locking teeth 5011 to be always clamped into the ratchet tooth grooves 202 to prevent the cutting blade 2 from reversing in the closed cutting state.

The blade reset piece 6 and the lock knife reset piece 7 are integrated, so that a reset piece connecting column 1021 for connecting the blade reset piece 6 and a reset piece connecting column 1021 for connecting the lock knife reset piece 7 are the same reset piece connecting column 1021; specifically, a torsion spring is sleeved on the reset piece connecting column 1021, one connecting leg of the torsion spring extends towards the cutting blade 2 and is connected with the reset piece connecting hole 204 to form a blade reset piece 6; the other connecting leg of the torsion spring extends towards the lock blade pawl 501 and is connected with the reset connecting groove to form a lock blade reset piece 7.

Preferably, the cutting blade 2 is recessed inwards towards the side of the limiting structure 3 to form an avoiding area 203, and a limiting surface 201 matched with the limiting structure 3 is formed on the side surface of the cutting blade 2 facing the limiting structure 3.

Adopt above-mentioned structure, set up dodge district 203, make when cutting blade 2 and opening, can rotate behind the bigger angle just with limit structure 3 supports and leans on the stall, has improved promptly cut out the open-ended upper limit of 4 to satisfy the pipe fitting of bigger diameter.

Preferably, the mounting surface 101 is recessed inwardly to form a blade groove 104 to be fitted with the cutting blade 2.

With the above structure, when the cutting blade 2 is closed, the blade groove 104 can continue to rotate after the cutting edge of the cutting blade 2 is flush with the placing surface 101, so that the cutting edge of the cutting blade 2 enters the blade groove 104; since the pipe member is placed on the placing surface 101, the cutting of the pipe member can be further completed when the cutting edge of the cutting blade 2 enters the blade groove 104.

Preferably, the positioning hole 3021 includes a first positioning hole 3021a and a second positioning hole 3021b, the limiter 301 is placed in the first positioning hole 3021a and abuts against the cutting blade 2, the maximum opening of the cutting opening 4 can be placed with an object to be cut having a diameter not more than Φ 1, and the center of the second positioning hole 3021b is not on the plane of the limiting surface 201; in a state where the restriction member 301 is placed in the second positioning hole 3021b and abuts against the cutting blade 2, the maximum opening of the cutting opening 4 can receive a material to be cut having a diameter of not more than Φ 2, and the center of the first positioning hole 3021a is not on the plane of the restriction surface 201; said phi 1 is substantially larger than said phi 2.

By adopting the structure, the maximum opening of the cutting opening 4 is selected by two gears by arranging the two positioning holes 3021, and when the limiting piece 301 is arranged in the first positioning hole 3021a, the pipe cutting knife is suitable for cutting a pipe fitting with a larger diameter; when the limiting member 301 is placed in the second positioning hole 3021b, the pipe cutting knife is suitable for cutting a pipe fitting with a smaller diameter.

Specifically, the value of phi 1 is 42mm, and the value of phi 2 is 26 mm.

Preferably, the cutting blade 2 includes a first blade edge 205 and a second blade edge 206 connected therewith, and the first blade edge 205 and the second blade edge 206 are disposed at an angle and form a sharp blade portion 207 at the connection.

By adopting the structure, when the cutting blade 2 is used for closed cutting, the sharp knife part 207 can be used for piercing the pipe fitting, so that the cutting is convenient.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the technical principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.

Claims (10)

1. A pipe cutter is characterized in that: including sword casing (1), with sword casing (1) articulated cut blade (2) and limit structure (3), sword casing (1) is provided with and is used for leaning on face (101) of placing by the thing of cutting out, cut blade (2) under the open mode, cut blade (2) with place face (101) and mutually support and form and be used for placing the opening (4) of cutting out of being cut out, cut blade (2) with limit structure (3) counterbalance is leaned on in order to restrict cut out the maximum opening of opening (4), cut blade (2) with the support of limit structure (3) is leaned on the position is adjustable.

2. The tube cutter according to claim 1, wherein: the limiting structure (3) comprises a limiting piece (301) used for abutting against the cutting blade (2) and an adjusting structure (302) which is matched with the limiting piece (301) and used for changing the position of the limiting piece (301).

3. The tube cutter according to claim 2, wherein: the cutting blade (2) is provided with a limiting surface (201) which is abutted against the limiting part (301); the adjustment structure (302) comprises at least two positioning holes (3021) arranged in the vicinity of the limiting surface (201); when the limiting piece (301) is placed in one of the positioning holes (3021) and is abutted against the limiting surface (201) of the cutting blade (2), the center of at least one other positioning hole (3021) is not on the plane of the limiting surface (201).

4. The tube cutter according to claim 1, wherein: the utility model discloses a sword casing (1) including with cut out blade (2) articulated and be provided with place fixed handle (102) of face (101), with fixed handle (102) articulated activity handle (103) and with cut out blade (2) cooperate with the drive with the pivoted drive structure (5) of cutting out blade (2).

5. The tube cutter according to claim 4, wherein: the cutting blade (2) is provided with a ratchet tooth groove (202); the driving structure (5) comprises a knife locking pawl (501) hinged with the fixed handle (102) and matched with the ratchet wheel tooth groove (202), and a knife pushing pawl (502) hinged with the movable handle (103) and matched with the ratchet wheel tooth groove (202).

6. The tube cutter according to claim 1, wherein: comprises a blade resetting piece (6), wherein the blade resetting piece (6) acts on the cutting blade (2) and enables the cutting blade (2) to have the tendency of moving to abut against the limiting structure (3).

7. The tube cutter according to claim 5, wherein: the locking knife reset piece (7) is included, and the locking knife reset piece (7) acts on the locking knife pawl (501) and enables the locking knife pawl (501) to have the tendency of being clamped into the ratchet tooth groove (202).

8. The tube cutter according to claim 1, wherein: the cutting blade (2) faces towards the limiting structure (3) and is inwards recessed to form an avoiding area (203), and a limiting surface (201) matched with the limiting structure (3) is formed on the side face, facing the limiting structure (3), of the cutting blade (2).

9. The tube cutter according to claim 1, wherein: the placing surface (101) is inwards sunken to form a blade groove (104) matched with the cutting blade (2).

10. A tube cutter according to claim 3 wherein: the positioning hole (3021) comprises a first positioning hole (3021a) and a second positioning hole (3021b), the limiting piece (301) is arranged in the first positioning hole (3021a) and is abutted against the cutting blade (2), and the maximum opening of the cutting opening (4) can be used for placing an object to be cut with the diameter not more than phi 1; the limiting piece (301) is arranged in the second positioning hole (3021b) and is abutted against the cutting blade (2), and the maximum opening of the cutting opening (4) can be used for placing an object to be cut with the diameter not more than phi 2; said phi 1 is substantially larger than said phi 2.

Images