A pizza cutter

CN224643707UActive Publication Date: 2026-08-18MILLENNIUM MARKETING INTERTRADE 1999 LTD
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Patent Information

Application Number
CN202521503599.0
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-07-17
Publication Date
2026-08-18
Estimated Expiration
2035-07-17

AI Technical Summary

Technical Problem

[0003]但是现有的披萨切刀还存在有不足之处,就是通过塑料卡扣来连接两柄片,由于塑料卡扣的每次扣接或解除扣接都会使得卡扣发生一定的弹性变形,在对两柄片经过多次拆装后,塑料卡扣变形次数多了会很容易断裂,而一旦卡扣结构出现断裂情况,就需要报废整个产品,产品的可靠耐用性差

Benefits of technology

[0015]进一步地,上述刀片的刀片切割部套装有保护套,在保护套对刀片的保护作用下,可以保证刀片的卫生,也可以防止用户被刀片误伤,提高安全性。上述保护套对应与刀柄相对侧的两端位置分别设有插块,两插块插接于两柄片之间位置,这样可以方便保护套的拆装。

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Abstract

The utility model discloses a pizza cutter, including handle and blade, the handle includes first handle piece and second handle piece of opposite setting, and the detachable connection of blade is between two handle pieces, and the part of blade is located between two handle pieces outside, and the part blade of being located between two handle piece outside is blade cutting part, first handle piece can close and open to second handle piece, first handle piece is equipped with first magnetic attraction piece, and second handle piece is equipped with second magnetic attraction piece and first magnetic attraction piece is attracted, when first handle piece and second handle piece close, the position of first magnetic attraction piece and the position of second magnetic attraction piece are opposite. The utility model discloses a pizza cutter through two magnetic attraction pieces to fix two handle pieces in the closed state, compared with the pizza cutter of fixing two handle pieces through the plastic buckle of existing, magnetic attraction piece will not appear damage in two handle piece open and close operation, thereby make the pizza cutter structure of the utility model more reliable, and the product is more durable, and it is more convenient to clean.
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Description

Technical Field

[0001] This utility model belongs to the field of cutting tool technology, specifically relating to a pizza cutter. Background Technology

[0002] Existing pizza cutter structures generally include two opposing blades and a detachable blade connected between the two blades. The cutting part of the blade protrudes from the outside between the two blades, and the two blades are connected to each other by plastic clips to facilitate the assembly and disassembly of the two blades. After the two blades are disassembled, it is also convenient to clean the blade.

[0003] However, existing pizza cutters have shortcomings. They connect the two slices using plastic clips. Each time the clips are fastened or unfastened, they undergo elastic deformation. After repeated disassembly and reassembly of the two slices, the clips are prone to breakage. Once the clip structure breaks, the entire product needs to be scrapped, resulting in poor reliability and durability. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a reliable and durable pizza cutter.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a pizza cutter, including a handle and a blade, wherein the handle includes a first handle piece and a second handle piece arranged opposite to each other, the blade is detachably connected between the two handle pieces, and the blade part is located on the outer side between the two handle pieces, and the part of the blade located on the outer side between the two handle pieces is the blade cutting part, the first handle piece can be closed and opened relative to the second handle piece, the first handle piece is provided with a first magnetic attraction member, and the second handle piece is provided with a second magnetic attraction member that attracts the first magnetic attraction member, and when the first handle piece and the second handle piece are closed, the position of the first magnetic attraction member is opposite to the position of the second magnetic attraction member.

[0006] In the above solution, a first magnetic element is provided on the first handle piece, and a second magnetic element is provided on the second handle piece. When the first and second handle pieces are closed, the positions of the first and second magnetic elements are opposite each other, causing them to attract each other. Under this attraction, the two handle pieces will not open automatically, thus fixing them in a closed state. By forcefully prying the two handle pieces, the first magnetic element is released from the attraction of the second magnetic element, allowing the two handle pieces to open. This is convenient to operate. When the two handle pieces are open, the blade and the inside of the handle can be cleaned. Compared to existing pizza cutters that use plastic clips to connect and fix the two handle pieces, this invention uses two magnetic elements to fix the two handle pieces closed. The magnetic elements will not be damaged during the opening and closing operations, making the pizza cutter structure more reliable, the product more durable, and easier to clean.

[0007] Furthermore, both the first and second magnetic attractors are magnetic blocks, and there are multiple first and second magnetic attractors. Multiple first magnetic attractors are arranged along the inner edge of the first handle piece, and multiple second magnetic attractors are arranged along the inner edge of the second handle piece. When the first and second handle pieces are closed, multiple magnetic blocks of the first handle piece attract each other with the corresponding magnetic blocks of the second handle piece, thereby fixing the two handle pieces in a closed state. This solution uses multiple sets of magnetic blocks to attract each other to firmly fix the two handle pieces in a closed state.

[0008] Furthermore, both the first and second magnetic attractors are magnetic blocks. The first magnetic attractor is located inside the first handle plate, corresponding to the middle position of the blade, and the second magnetic attractor is located inside the second handle plate, corresponding to the middle position of the blade. When the first and second handle plates are closed, the magnetic blocks of the first and second handle plates attract each other, thereby fixing the two handle plates in a closed state.

[0009] Furthermore, the edges of the first handle piece and the second handle piece are rotatably connected so that the first handle piece can rotate to close and open relative to the second handle piece. This ensures that the two handle pieces will not completely separate in the open state, making it easier to close the two handle pieces again. The opening and closing operations are more convenient. In addition, combined with the mutual attraction of the first magnetic attraction piece and the second magnetic attraction piece, the two handle pieces are more firmly fixed in the closed state.

[0010] Furthermore, the second handle is provided with a connecting post at the end away from the blade cutting part, and the first handle is provided with a connecting block at the end away from the blade cutting part. The connecting block has a snap-fit ​​groove, and the connecting block is fitted onto the outside of the connecting post of the second handle through the snap-fit ​​groove. The connecting block can rotate relative to the connecting post, so that the first handle can be opened and closed relative to the second handle by rotating around the connecting post through the connecting block. The snap-fit ​​groove on the outside of the connecting post facilitates the assembly and disassembly of the connecting block and the connecting post.

[0011] Furthermore, the first handle plate is provided with a mounting groove at the position corresponding to the connecting block, and one end of the connecting block is fixed in the mounting groove. The second handle plate is provided with a notch at the position corresponding to the connecting post, and the connecting post is horizontally positioned in the notch. The other end of the connecting block is placed in the notch. This reduces the number of connecting blocks protruding outside the two handle plates, making the structure of the pizza cutter more compact.

[0012] Furthermore, the blade has a circular structure and a rotating hole in the middle. A rotating shaft is provided on the inner side of the second handle corresponding to the rotating hole of the blade. The blade is fitted onto the outer side of the rotating shaft through the rotating hole so that the blade can rotate around the rotating shaft, making it easier to cut pizza. A protrusion is provided on the inner side of the first handle corresponding to the position aligned with the rotating shaft. The end faces of the protrusion and the rotating shaft are provided with receiving grooves. The first magnetic component and the second magnetic component are respectively installed in the receiving grooves on the corresponding sides, which facilitates the installation of the first magnetic component and the second magnetic component.

[0013] Furthermore, a lower positioning ring and an upper positioning ring are fitted on the outer side of the aforementioned rotating shaft. The blade is positioned between the lower positioning ring and the upper positioning ring. The two positioning rings can prevent the blade from moving up and down along the rotating shaft, ensuring the installation stability of the blade.

[0014] Furthermore, the lower positioning ring has a convex ring at its upper end, and the lower positioning ring and the convex ring are concentric. Several positioning protrusions are located on the upper end of the lower positioning ring corresponding to the outer position of the convex ring. Both the lower positioning ring and the convex ring are fitted onto the outer side of the rotating shaft. An annular groove is opened on the lower side of the upper positioning ring, and the convex ring of the lower positioning ring fits into the annular groove of the upper positioning ring. This facilitates the assembly and disassembly of the upper and lower positioning rings. The inner side of the rotating hole of the blade has several positioning grooves that mate with the positioning protrusions. The blade is fitted onto the outer side of the convex ring through the rotating hole, and the positioning grooves mate with the positioning protrusions, so that the blade rotates simultaneously with the convex ring. This is equivalent to the blade rotating around the rotating shaft through the convex ring, making the blade rotation more stable.

[0015] Furthermore, the cutting part of the blade is fitted with a protective sleeve. This sleeve protects the blade, ensuring its hygiene and preventing accidental injury to the user, thus improving safety. The protective sleeve has inserts at both ends opposite the handle, which are inserted between the two blades, facilitating easy installation and removal of the protective sleeve.

[0016] The two handles of this pizza cutter are fixed in a closed state by magnetic blocks attracting each other, making the opening and closing of the two handles more convenient and easier to clean. Compared with existing pizza cutters that use plastic clips to connect and fix the two handles, the magnetic block structure of this pizza cutter will not be damaged during the opening and closing of the two handles, thus making the pizza cutter structure more reliable and the product more durable. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the pizza cutter in the closed state of the two handles, according to an embodiment of the present invention.

[0018] Figure 2 This is a schematic diagram of the structure of the pizza cutter in the open state of the two handles, according to an embodiment of the present invention.

[0019] Figure 3 This is a first exploded structural diagram of the pizza cutter according to an embodiment of the present invention.

[0020] Figure 4 for Figure 1 Sectional view of AA.

[0021] Figure 5 This is a second exploded view of the pizza cutter according to an embodiment of the present invention. Detailed Implementation

[0022] The accompanying drawings are for illustrative purposes only and should not be construed as limiting this patent. To better illustrate this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting this patent.

[0023] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "long," and "short" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0024] The technical solution of this utility model will be further described in detail below through specific embodiments and with reference to the accompanying drawings:

[0025] Example 1

[0026] like Figure 1 As shown, this embodiment provides a pizza cutter, including a handle 1 and a blade 2. The handle 1 includes a first handle plate 11 and a second handle plate 12 disposed opposite to each other. The blade 2 is detachably connected between the two handle plates, and a portion of the blade 2 is located on the outer side between the two handle plates. The portion of the blade 2 located on the outer side between the two handle plates is the cutting part. The first handle plate 11 can be closed and opened relative to the second handle plate 12. The first handle plate 11 is provided with a first magnetic attraction member 111, and the second handle plate 12 is provided with a second magnetic attraction member 121 that attracts the first magnetic attraction member 111. When the first handle plate 11 and the second handle plate 12 are closed, the positions of the first magnetic attraction member 111 and the second magnetic attraction member 121 are opposite to each other, so that the first magnetic attraction member 111 and the second magnetic attraction member 121 attract each other. At this time, the two handle plates will not open automatically under the mutual attraction of the two magnetic attraction members, thereby fixing the two handle plates in a closed state. In this state, the handle 1 can be held normally to operate the blade 2. By forcefully prying the two handles apart, the first magnetic 111 is disengaged from the second magnetic 121, and the two handles can be opened. This operation is convenient. With the two handles open, the blade 2 and the inside of the handle 1 can be cleaned.

[0027] Compared to existing pizza cutters that use plastic clips to connect and fix the two slices, the pizza cutter of this embodiment uses two magnetic components to fix the two slices closed. The magnetic components will not be damaged during the opening and closing operations of the two slices, thus making the pizza cutter structure more reliable, the product more durable, and easier to clean.

[0028] Specifically, in order to realize the structural function of the first magnetic suction member 111 attracting the second magnetic suction member 121, both the first magnetic suction member 111 and the second magnetic suction member 121 in this embodiment are magnetic blocks, and there are several of each. Several first magnetic suction members 111 are evenly arranged along the inner edge of the first handle piece 11, and several second magnetic suction members 121 are evenly arranged along the inner edge of the second handle piece 12. When the first handle piece 11 and the second handle piece 12 are closed, several magnetic blocks of the first handle piece 11 attract each other with the corresponding magnetic blocks of the second handle piece 12, thereby fixing the two handle pieces in a closed state. In this embodiment, by having several sets of magnetic blocks attract each other, the two handle pieces are firmly fixed in a closed state. It can also be realized that the two handle pieces can be completely separated in the open state, making cleaning more convenient.

[0029] Example 2

[0030] This embodiment is basically similar in structure to the pizza cutter in Embodiment 1, except that, as Figure 1 As shown, in order to realize the structural function of the first magnetic attractor 111 attracting the second magnetic attractor 121, the first magnetic attractor 111 in this embodiment is a magnetic block provided on the inner side of the first handle 11, and the second magnetic attractor 121 can be a metal block provided on the inner side of the second handle 12 that can be attracted to a magnet. In this way, when the first handle 11 and the second handle 12 are closed, the magnetic block of the first handle 11 and the metal block of the second handle 12 attract each other, thereby fixing the two handles in a closed state.

[0031] Of course, the second handle piece 12 can also be made of a metal material that can attract magnets. When the first handle piece 11 and the second handle piece 12 are closed, the part of the second handle piece 12 that is opposite to the first magnetic attractor 111 is the second magnetic attractor 121. That is, the second magnetic attractor 121 and the second handle piece 12 are integrally formed. In this way, when the first handle piece 11 and the second handle piece 12 are closed, the magnetic block of the first handle piece 11 will attract the second magnetic attractor 121 of the second handle piece 12, thereby fixing the two handle pieces in a closed state.

[0032] Example 3

[0033] This embodiment is basically similar in structure to the pizza cutter in Embodiment 1, except that, as Figure 1-3As shown, in order to realize the structural function of the first magnetic 111 attracting the second magnetic 121, the first magnetic 111 and the second magnetic 121 in this embodiment are both one and both are magnetic blocks. The first magnetic 111 is located inside the first handle 11 corresponding to the middle position of the blade 2, and the second magnetic 121 is located inside the second handle 12 corresponding to the middle position of the blade 2. When the first handle 11 and the second handle 12 are closed, the magnetic block of the first handle 11 and the magnetic block of the second handle 12 are opposite to each other and attract each other, thereby fixing the two handles in a closed state.

[0034] Furthermore, the left edge of the first handle 11 is rotatably connected to the left edge of the second handle 12, so that the first handle 11 can rotate to close and open relative to the second handle 12. This ensures that the two handles will not completely separate when open, making it easier for the two handles to close again, and making the opening and closing operation more convenient.

[0035] Specifically, such as Figure 3 As shown, the left edge of the second handle piece 12 is provided with a connecting post 122, and the left edge of the first handle piece 11 is provided with a connecting block 3. The inner side of the lower end of the connecting block 3 is provided with a buckle groove 31. The buckle groove 31 is an open structure. The connecting block 3 is fitted onto the outside of the connecting post 122 of the second handle piece 12 through the buckle groove 31, and the connecting block 3 can rotate relative to the connecting post 122. This allows the first handle piece 11 to rotate around the connecting post 122 relative to the second handle piece 12 to open and close. The buckle groove 31 is fitted onto the outside of the connecting post 122, which facilitates the assembly and disassembly of the connecting block 3 and the connecting post 122.

[0036] Furthermore, the first handle 11 has a mounting groove 110 corresponding to the position of the connecting block 3. The upper end of the connecting block 3 is placed in the mounting groove 110, and a connecting pin 4 passes through the side wall of the first handle 11 and is threadedly connected to the connecting block 3, thereby fixing the connecting block 3 and the first handle 11 together and facilitating the assembly and disassembly of the connecting block 3 and the first handle 11. The second handle 12 has a notch 120 corresponding to the position of the connecting post 122. The connecting post 122 is horizontally positioned within the notch 120, and the lower end of the connecting block 3 is placed within the notch 120. This reduces the protrusion of the connecting block 3 from the outside of the two handles, making the pizza cutter structure more compact.

[0037] Compared to the pizza cutter of Embodiment 1, the first handle 11 of this embodiment is rotatably connected to the connecting post 122 of the second handle 12 via the connecting block 3, so that the two handles will not completely separate in the open state, making it easier to open and close the two handles. In addition, the right ends of the two handles in this embodiment are attracted by two magnetic blocks, and combined with the rotatable connection structure at the left ends of the two handles, thereby ensuring the structural stability of the two handles in the closed state.

[0038] Example 4

[0039] This embodiment is a further improvement on the pizza cutter structure of Embodiment 3. The improvement lies in, for example... Figure 3 As shown, the blade 2 has a circular structure and a rotating hole 21 in the middle. A rotating shaft 5 is located on the inner side of the second handle 12 corresponding to the rotating hole 21 of the blade 2. The blade 2 is fitted onto the outer side of the rotating shaft 5 through the rotating hole 21, allowing the blade 2 to rotate around the rotating shaft 5, making pizza cutting easier. A protrusion 113 is located on the inner side of the first handle 11, corresponding to the position aligned with the rotating shaft 5. Each end face of the protrusion 113 opposite to the rotating shaft 5 has a receiving groove 50. The first magnetic component 111 and the second magnetic component 121 are respectively installed in the receiving groove 50 on the corresponding side through a magnetic block seat 6, facilitating the installation of the first magnetic component 111 and the second magnetic component 121. Furthermore, the magnetic block seat 6 can encapsulate and protect the first magnetic component 111 and the second magnetic component 121, reducing corrosion.

[0040] The outer side of the aforementioned rotating shaft 5 is fitted with a lower positioning ring 51 and an upper positioning ring 52. The blade 2 is positioned between the lower positioning ring 51 and the upper positioning ring 52. The two positioning rings can prevent the blade 2 from moving up and down along the rotating shaft, ensuring the installation stability of the blade 2.

[0041] Specifically, the lower positioning ring 51 has a convex ring 511 at its upper end. The lower positioning ring 51 and the convex ring 511 are concentric. The outer diameter of the convex ring 511 is smaller than that of the lower positioning ring 51. The outer diameter of the convex ring 511 matches the diameter of the rotating hole 21 of the blade 2. Four positioning protrusions 512 are evenly distributed around the upper end of the lower positioning ring 51, corresponding to the outer side of the convex ring 511. The lower positioning ring 51 and the convex ring 511 are both fitted onto the outer side of the rotating shaft 5. An annular groove is opened on the lower side of the upper positioning ring 52. The convex ring 511 of the lower positioning ring 51 fits into the annular groove of the upper positioning ring 52. This facilitates the assembly and disassembly of the upper positioning ring 52 and the lower positioning ring 51. The inner circumference of the rotating hole 21 of the blade 2 is provided with four positioning grooves 211 that cooperate with the positioning protrusion 512. The blade 2 is fitted onto the outside of the protruding ring 511 through the rotating hole 21, and the positioning grooves 211 cooperate with the positioning protrusion 512 so that the blade 2 rotates with the protruding ring 511. This is equivalent to the blade 2 rotating around the rotating shaft 5 through the protruding ring 511, making the rotation of the blade 2 more stable.

[0042] like Figure 4 As shown, the outer diameter of the protrusion 113 is larger than the inner diameter of the upper positioning ring 52. When the two handles are rotated to the closed state, the protrusion 113 is located on the upper side of the upper positioning ring 52, and the protrusion 113 is concentric with the upper positioning ring 52. This allows the protrusion 113 to prevent the upper positioning ring 52 from moving upward relative to the rotating shaft 5, thus ensuring the installation stability of the upper positioning ring 52.

[0043] As an improvement to this embodiment, such as Figure 1 , 5As shown, the cutting part of the blade 2 is fitted with a protective sleeve 7. The protective sleeve 7 protects the blade 2, ensuring its hygiene and preventing accidental injury to the user, thus improving safety. The protective sleeve 7 has insert blocks 71 at its two ends opposite to the handle 1. These insert blocks 71 are inserted between the two blades, facilitating the installation and removal of the protective sleeve 7.

[0044] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A pizza cutter, comprising a handle (1) and a blade (2), wherein the handle (1) comprises a first handle plate (11) and a second handle plate (12) disposed opposite to each other, the blade (2) being detachably connected between the two handle plates, and a portion of the blade (2) being located on the outer side between the two handle plates, wherein the portion of the blade located on the outer side between the two handle plates is the cutting portion of the blade, characterized in that: The first handle (11) can be closed and opened relative to the second handle (12). The first handle (11) is provided with a first magnetic attractor (111), and the second handle (12) is provided with a second magnetic attractor (121) that attracts the first magnetic attractor (111). When the first handle (11) and the second handle (12) are closed, the position of the first magnetic attractor (111) is opposite to the position of the second magnetic attractor (121).

2. The pizza cutter according to claim 1, characterized in that: Both the first magnetic attractor (111) and the second magnetic attractor (121) are magnetic blocks, and there are several of each. Several first magnetic attractors (111) are arranged along the inner edge of the first handle (11), and several second magnetic attractors (121) are arranged along the inner edge of the second handle (12).

3. The pizza cutter according to claim 1, characterized in that: Both the first magnetic accumulator (111) and the second magnetic accumulator (121) are magnetic blocks. The first magnetic accumulator (111) is located inside the first handle (11) at the middle position corresponding to the blade (2), and the second magnetic accumulator (121) is located inside the second handle (12) at the middle position corresponding to the blade (2).

4. The pizza cutter according to claim 1, characterized in that: The edge of the first handle (11) is rotatably connected to the edge of the second handle (12) so that the first handle (11) can rotate to close and open relative to the second handle (12).

5. The pizza cutter according to claim 4, characterized in that: The second handle (12) has a connecting post (122) at one end away from the blade cutting part, and the first handle (11) has a connecting block (3) at one end away from the blade cutting part. The connecting block (3) has a buckle groove (31). The connecting block (3) is fitted onto the outside of the connecting post (122) of the second handle (12) through the buckle groove (31), and the connecting block (3) can rotate relative to the connecting post (122).

6. The pizza cutter according to claim 5, characterized in that: The first handle (11) has an installation groove (110) at the position corresponding to the connecting block (3), and one end of the connecting block (3) is fixed in the installation groove (110). The second handle (12) has a notch (120) at the position corresponding to the connecting post (122), and the connecting post (122) is horizontally arranged in the notch (120). The other end of the connecting block (3) is placed in the notch (120).

7. The pizza cutter according to claim 1, characterized in that: The blade (2) has a circular structure and a rotating hole (21) is provided in the middle of the blade (2). A rotating shaft (5) is provided on the inner side of the second handle (12) corresponding to the rotating hole (21) of the blade (2). The blade (2) is fitted onto the outer side of the rotating shaft (5) through the rotating hole (21). A protrusion (113) is provided on the inner side of the first handle (11) corresponding to the position of the rotating shaft (5). A receiving groove (50) is provided on the end face of the protrusion (113) opposite to the rotating shaft (5). The first magnetic suction member (111) and the second magnetic suction member (121) are respectively installed in the receiving groove (50) on the corresponding side.

8. The pizza cutter according to claim 7, characterized in that: The rotating shaft (5) is fitted with a lower positioning ring (51) and an upper positioning ring (52) on its outer side, and the blade (2) is positioned between the lower positioning ring (51) and the upper positioning ring (52).

9. The pizza cutter according to claim 8, characterized in that: The lower positioning ring (51) has a convex ring (511) at its upper end. The lower positioning ring (51) and the convex ring (511) are concentric. The upper end of the lower positioning ring (51) is provided with a number of positioning protrusions (512) corresponding to the outer position of the convex ring (511). The lower positioning ring (51) and the convex ring (511) are both fitted on the outer side of the rotating shaft (5). The lower side of the upper positioning ring (52) has an annular groove. The convex ring (511) of the lower positioning ring (51) is fitted in the annular groove of the upper positioning ring (52). The inner side of the rotating hole (21) of the blade (2) is provided with a number of positioning grooves (211) that cooperate with the positioning protrusions (512). The blade (2) is fitted on the outer side of the convex ring (511) through the rotating hole (21), and the positioning grooves (211) cooperate with the positioning protrusions (512).

10. The pizza cutter according to claim 1, characterized in that: The blade (2) is fitted with a protective sleeve (7) on the cutting part. The protective sleeve (7) has two inserts (71) at the two ends opposite to the handle (1). The two inserts (71) are inserted between the two blades.