Art knife capable of hiding knife head and use method thereof

Abstract

The invention relates to the technical field of art knives, and discloses an art knife capable of hiding a knife head, which comprises a knife shell, a movable groove is formed in one side of the knife shell, a first connecting block is movably mounted in the movable groove, a push block is fixedly connected to the outer side of the first connecting block, a first mounting hole is formed in the outer side of the push block, and a second mounting hole is formed in the outer side of the first mounting hole. A pressing rod is movably mounted in the first mounting hole, the pressing rod is movably sleeved with a first connecting block, and one side of the first connecting block is fixedly connected with a first mounting box. According to the art knife with the knife head capable of being hidden, through the arrangement of the limiting plate and the arrangement of the pressing rod, the blade with the position changed through stretching and retracting can be conveniently fixed, use of the art knife is facilitated, through the arrangement of the sealing clamping plate, the blade can be conveniently taken out for replacement, and the use efficiency of the art knife is improved; and through the arrangement of the hidden baffle, the working state of the blade can be conveniently switched, and the use requirements under different conditions are met.

Description

Technical Field

[0001] The invention relates to the technical field of utility knives, and in particular to a utility knife with a hidden blade and a use method thereof. Background Art

[0002] A utility knife is a small cutting tool widely used in the fields of handicrafts, model making, packaging disassembly, etc. When using a utility knife, you must pay attention to safety and avoid the blade from scratching your fingers or other body parts. After use, the blade should be retracted or folded immediately and stored out of the reach of children.

[0003] In real life, in order to prevent users from getting their fingers scratched by the blade when using a utility knife, the blade is often hidden to reduce accidental injuries. A common hiding method is to hide the blade in the knife case, but it is inconvenient to lock the blade position according to needs after retracting the blade. The blade is easily damaged after long-term use. The blade hidden in the knife case is not convenient to replace. In actual use, only the tip or edge of the blade may be needed for cutting. The existing utility knife is not convenient to switch between the two states, which is easy to cause accidental injuries. Therefore, a utility knife with a hidden blade head and a method of using the same are proposed. Summary of the invention

[0004] The main purpose of the present invention is to provide a utility knife with a hidden blade head and a method for using the same, which solves the problem that a common hiding method is to hide the blade in a knife housing, but it is inconvenient to lock the blade position according to demand after retracting the blade, the blade is easily damaged after long-term use, and the blade hidden in the knife housing is not convenient to replace. In actual use, only the tip or edge of the blade may be needed for cutting. The existing utility knife is not convenient to switch between the two states, which may easily cause accidental injury.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] A utility knife with a hidden blade head comprises a knife shell, a movable groove is provided on one side of the knife shell, a first connecting block is movably installed in the movable groove, a push block is fixedly connected to the outer side of the first connecting block, a first mounting hole is provided on the outer side of the push block, a pressing rod is movably installed in the first mounting hole, and the pressing rod is movably sleeved in the first connecting block, a first mounting box is fixedly connected to one side of the first connecting block, and the pressing rod is movably sleeved in the first mounting box, one end of the pressing rod is fixedly connected to a first spring, a partition is fixedly connected in the first mounting box, and one end of the first spring is fixedly connected to the partition.

[0007] Furthermore, a connecting plate is fixedly sleeved on the outer side of the pressing rod, and the connecting plate is arranged in a first mounting box, and two fixing rods are fixedly connected to the inner side of the connecting plate at equal distances, and two second mounting holes are equally spaced on one side of the first mounting box, and the two fixing rods pass through the two second mounting holes respectively, and a plurality of first limiting grooves are equally spaced on the inner side of the knife housing, and one end of the outer sides of the two fixing rods are movably mounted in adjacent first limiting grooves respectively.

[0008] Furthermore, a first clamping block is movably installed inside the first installation box, second limiting grooves are provided on both sides of the first clamping block, first limiting blocks are movably installed in two second limiting grooves, and outer sides of the two first limiting blocks are fixedly connected to the inner wall of the first installation box.

[0009] Furthermore, a fixing groove is provided on one side of the first clamping block, a blade is movably installed in the fixing groove, the first clamping block is fixedly connected to a second clamping block in the fixing groove, and the blade is movably sleeved on the outer side of the second clamping block.

[0010] Furthermore, a first magnetic block is fixedly connected to one side of the first clamping block, a second magnetic block is magnetically attracted to the outer side of the first magnetic block, a sealing clamping plate is fixedly connected to the outer side of the second magnetic block, a connecting groove is provided on one side of the knife housing, the second magnetic block passes through the connecting groove, the sealing clamping plate abuts against the outer wall of the knife housing, a limiting sleeve is fixedly connected to the bottom of the knife housing, one end of the sealing clamping plate is movably sleeved in the limiting sleeve, a third limiting groove is provided on the inner side of the sealing clamping plate, a second limiting block is movably installed in the third limiting groove, and the inner side of the second limiting block is fixedly connected to the knife housing.

[0011] Furthermore, a knife outlet is provided on one side of the upper part of the knife housing, a mounting sleeve is fixedly connected to the upper part of the knife housing on one side of the knife outlet, a hidden baffle is movably installed in the mounting sleeve, and a cutting groove is provided on one side of the hidden baffle.

[0012] Furthermore, two fourth limiting grooves are equidistantly provided on one side of the mounting sleeve, two connecting rods are equidistantly fixedly connected to one side of the hidden baffle, the two connecting rods pass through the fourth limiting grooves respectively, the outer sides of the two fourth limiting grooves are fixedly connected with second connecting blocks, the lower sides of the two second connecting blocks are fixedly connected with second springs, the lower sides of the two second springs are fixedly connected to the knife housing, and two second mounting boxes are equidistantly fixedly connected to the outer side of the mounting sleeve, and the two second mounting boxes are respectively arranged on the outer sides of the two second springs.

[0013] Furthermore, the inner sides of the two mounting sleeves are fixedly connected to limiting rails, movable plates are clamped in the two limiting rails, third mounting holes are opened on both sides of the mounting sleeves, and blocking rods are fixedly connected to the inner sides of the movable plates, and the blocking rods pass through the two third mounting holes.

[0014] A method for using a utility knife with a hidden blade, such as the above-mentioned utility knife with a hidden blade, the specific steps of use are as follows:

[0015] S1. When using the utility knife, the user holds the knife housing tightly from the outside to use the utility knife;

[0016] S2. When the blade needs to be extended for cutting, the pressing rod is pressed, and the push block drives the blade to move through the first connecting block and the first mounting box until the blade moves to the required position, and then the pressing rod is released to fix the extended blade;

[0017] S3. When the blade needs to be replaced, the sealing card plate is pulled outwards, and the blade can be taken out from the fixed groove in the first card block for replacement;

[0018] S4. When it is necessary to switch the working state of the blade, remove the movable plate, and take out the blocking rod through the movable plate to expose the tip of the blade for use.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The present invention facilitates the fixing of the blade after the position is changed by telescoping through the provided pressing rod, and facilitates the use of the utility knife. The pressing rod is pressed, and the pressing rod drives the first spring to compress, and at the same time drives the fixing rod to move through the connecting plate until one end of the fixing rod is no longer movable and is installed in the first limiting groove. At this time, the pushing block can be pushed, and the pushing block drives the blade to move through the first connecting block and the first mounting box. When the blade moves to the required position, the pressing rod is released, and the first spring extends to drive the fixing rod to reset, thereby fixing the blade. Through such a configuration, it is convenient to fix the blade after the position is changed by telescoping, and facilitates the use of the utility knife.

[0021] 2. The present invention facilitates the removal of blades for replacement by setting a sealing card plate, thereby improving the use efficiency of the utility knife. When the sealing card plate is pulled outward, the sealing card plate drives the first card block to move through the second magnetic block and the first magnetic block, and the first card block takes out the blade through the connecting groove through the second card block. Through such a setting, it is convenient to take out the blade for replacement, thereby improving the use efficiency of the utility knife.

[0022] 3. The present invention facilitates switching the working state of the blade by setting a hidden baffle, and meets the use requirements in different situations. When only the side edge of the blade needs to be used, the blade can be used for cutting through the cutting groove on the hidden baffle. At the same time, the hidden baffle can hide other parts of the blade to prevent accidental injury. When the tip of the blade needs to be used, the movable plate is removed and the blocking rod is taken out through the movable plate. At this time, when the blade is used, pressing the blade on the surface of the object can squeeze and cause the hidden baffle to shrink, so that the tip of the blade is exposed for use. Through such a setting, it is convenient to switch the working state of the blade and meet the use requirements in different situations.

[0023] The parts not involved in the device are the same as those in the prior art or can be implemented by using the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the overall structure of a utility knife with a hidden blade from a first angle according to the present invention.

[0025] Figure 2 This is a schematic diagram of the overall structure of a utility knife with a hidden blade from a second angle according to the present invention.

[0026] Figure 3 The third angle diagram of the overall structure of the utility knife with a hidden blade according to the present invention.

[0027] Figure 4 The present invention is an enlarged schematic diagram of a partial structure of a knife shell of a utility knife capable of hiding a knife head.

[0028] Figure 5 It is an enlarged schematic diagram of a partial structure of a first installation box of a utility knife capable of hiding a knife head according to the present invention.

[0029] Figure 6 The diagram is an enlarged schematic diagram of a partial structure of a pressing rod of a utility knife capable of hiding the blade head according to the present invention.

[0030] Figure 7 It is an enlarged schematic diagram of a partial structure of a second magnetic block of a utility knife capable of hiding a blade of the present invention.

[0031] Figure 8 The present invention is an enlarged schematic diagram of a partial structure of a hidden baffle of a utility knife capable of hiding the blade.

[0032] Fig. 9 It is an enlarged schematic diagram of a partial structure of a second spring of a utility knife capable of hiding the blade head according to the present invention.

[0033] In the figure: 1. knife shell; 2. push block; 3. pressing rod; 4. first connecting block; 5. first spring; 6. connecting plate; 7. fixing rod; 8. first limiting groove; 9. movable groove; 10. first installation box; 11. partition; 12. first limiting block; 13. first clamping block; 14. second clamping block; 15. blade; 16. second limiting groove; 17. first magnetic block; 18. second magnetic block; 19. sealing clamping plate; 20. third limiting groove; 21. second limiting block; 22. limiting sleeve; 23. knife edge; 24. installation sleeve; 25. hidden baffle; 26. cutting groove; 27. second installation box; 28. limiting track; 29. ​​movable plate; 30. fourth limiting groove; 31. second connecting block; 32. second spring; 34. blocking rod. DETAILED DESCRIPTION

[0034] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0035] like Figure 1-Figure 6 As shown, a utility knife with a hidden blade head comprises a knife shell 1, a movable groove 9 is provided on one side of the knife shell 1, a first connecting block 4 is movably installed in the movable groove 9, a push block 2 is fixedly connected to the outer side of the first connecting block 4, a first mounting hole is provided on the outer side of the push block 2, a pressing rod 3 is movably installed in the first mounting hole, and the pressing rod 3 is movably sleeved in the first connecting block 4, a first mounting box 10 is fixedly connected to one side of the first connecting block 4, and the pressing rod 3 is movably sleeved in the first mounting box 10, one end of the pressing rod 3 is fixedly connected to a first spring 5, a partition 11 is fixedly connected in the first mounting box 10, and one end of the first spring 5 is fixedly connected to the partition 11. By adopting the above technical solution, the first spring 5 is in a pre-compressed state, and can maintain a pushing state of the pressing rod 3;

[0036] The push block 2 is in the shape of a groove for the user to push and press. When the user places a finger in the groove, the user can simultaneously press the pressing rod 3 and push the push block 2.

[0037] The movable groove 9 can limit the push block 2 through the first connecting block 4 so that the push block 2 can only move along the direction of the movable groove 9 .

[0038] like Figure 1-Figure 6As shown, the outer side of the pressing rod 3 is fixedly sleeved with a connecting plate 6, and the connecting plate 6 is arranged in the first installation box 10, and the inner side of the connecting plate 6 is equidistantly fixedly connected with two fixing rods 7, and one side of the first installation box 10 is equidistantly provided with two second installation holes, and the two fixing rods 7 pass through the two second installation holes respectively, and a plurality of first limiting grooves 8 are equidistantly provided on the inner side of the knife housing 1, and one end of the outer side of the two fixing rods 7 is movably installed in the adjacent first limiting grooves 8 respectively. By adopting the above technical scheme, by inserting one end of the fixing rod 7 into the adjacent first limiting groove 8, the fixing rod 7 can be limited to move up and down, and the pressing rod 3 can be limited to move up and down, thereby limiting the first installation box 10 to drive the blade 15 to move up and down.

[0039] like Figure 1-Figure 4 , Figure 7 As shown, a first clamping block 13 is movably installed inside the first installation box 10, and second limiting grooves 16 are opened on both sides of the first clamping block 13. First limiting blocks 12 are movably installed in the two second limiting grooves 16, and the outer sides of the two first limiting blocks 12 are fixedly connected to the inner wall of the first installation box 10. Through such an arrangement, the first limiting block 12 can limit the movement of the first clamping block 13 through the second limiting groove 16, so that the first clamping block 13 can only move along the direction of the second limiting groove 16.

[0040] like Figure 1-Figure 4 , Figure 7 As shown, a fixing groove is provided on one side of the first clamping block 13, a blade 15 is movably installed in the fixing groove, the first clamping block 13 is fixedly connected to the second clamping block 14 in the fixing groove, and the blade 15 is movably sleeved on the outer side of the second clamping block 14. With such an arrangement, the upper end of the blade 15 extends out of the fixing groove to perform cutting;

[0041] A fixing groove is provided on one side of the first clamping block 13, and the blade 15 can be taken out through the fixing groove;

[0042] The second clamping block 14 can limit the movement of the blade 15 so that the blade 15 can only be pulled outwards but cannot be pulled out from above.

[0043] like Figure 1-Figure 4 , Figure 7One side of the first clamping block 13 is fixedly connected with a first magnetic block 17, and the outer side of the first magnetic block 17 is magnetically attracted with a second magnetic block 18, and the outer side of the second magnetic block 18 is fixedly connected with a sealing clamping plate 19, and one side of the knife housing 1 is provided with a connecting groove, and the second magnetic block 18 passes through the connecting groove, and the sealing clamping plate 19 abuts against the outer wall of the knife housing 1, and the lower part of the knife housing 1 is fixedly connected with a limiting sleeve 22, and one end of the sealing clamping plate 19 is movably sleeved in the limiting sleeve 22, and a third limiting groove 20 is provided on the inner side of the sealing clamping plate 19, and a second limiting block 21 is movably installed in the third limiting groove 20, and the inner side of the second limiting block 21 is fixedly connected to the knife housing 1, through such an arrangement, the second magnetic block 18 and the first magnetic block 17 both have magnetic force and can be attracted to each other;

[0044] When the first installation box 10 drives the first clamping block 13 to move upward, the user can manually push to offset part of the magnetic force, so that the first clamping block 13 moves upward;

[0045] The sealing card plate 19 is made of a material with a certain elasticity and can be deformed to a certain extent. When the sealing card plate 19 needs to be removed, one end of the sealing card plate 19 can be bent outward so that the second limiting block 21 no longer limits the movement of the sealing card plate 19.

[0046] like Figure 1-Figure 4 , Figure 8-Figure 9 As shown, a knife outlet 23 is provided on one side of the upper part of the knife housing 1, and a mounting sleeve 24 is fixedly connected to the upper part of the knife housing 1 on one side of the knife outlet 23, a hidden baffle 25 is movably installed in the mounting sleeve 24, and a cutting groove 26 is provided on one side of the hidden baffle 25. By adopting the above technical solution, the position of the cutting groove 26 corresponds to the position of the blade 15, so that the blade 15 can extend from the cutting groove 26 after the telescopic movement.

[0047] like Figure 1-Figure 4 , Figure 8-Figure 9 As shown, two fourth limiting grooves 30 are equidistantly provided on one side of the installation sleeve 24, and two connecting rods are equidistantly fixedly connected to one side of the hidden baffle 25, and the two connecting rods pass through the fourth limiting grooves 30 respectively, and the outer sides of the two fourth limiting grooves 30 are fixedly connected with second connecting blocks 31, and the lower parts of the two second connecting blocks 31 are fixedly connected with second springs 32, and the lower parts of the two second springs 32 are fixedly connected with the knife housing 1, and the outer side of the installation sleeve 24 is equidistantly fixedly connected with two second installation boxes 27, and the two second installation boxes 27 are respectively arranged on the outer sides of the two second springs 32. Through such an arrangement, the fourth limiting groove 30 can limit the connecting rod to move only along the direction of the fourth limiting groove 30;

[0048] The installation sleeve 24 can limit the hidden baffle 25 to move only along the direction of the installation sleeve 24, and the hidden baffle 25 will not separate from the installation sleeve 24 during the movement;

[0049] The projection area of ​​the hidden baffle 25 without removing the blocking rod 34 is larger than that of the blade 15, so that the tip of the blade 15 will not be exposed beyond the hidden baffle 25 when the blade 15 moves. At the same time, the cutting groove 26 can expose part of the blade edge of the blade 15 and escape from the concealment of the hidden baffle 25.

[0050] like Figure 1-Figure 4 , Figure 8-Figure 9 As shown, the inner sides of the two mounting sleeves 24 are fixedly connected to the limiting rails 28, and the movable plates 29 are clamped in the two limiting rails 28. The two sides of the mounting sleeves 24 are provided with third mounting holes, and the inner sides of the movable plates 29 are fixedly connected to the blocking rods 34, and the blocking rods 34 pass through the two third mounting holes. Through such a setting, the limiting rails 28 can clamp the movable plates 29, and the movable plates 29 can only be taken out by the user manually pulling.

[0051] The blocking rod 34 can limit the movement of the hidden baffle 25 so that the hidden baffle 25 will not release the concealment of the tip of the blade 15 when the hidden baffle 25 retracts.

[0052] It should be noted that when in use, the user holds the knife housing 1 from the outside to use the utility knife.

[0053] When it is necessary to extend the blade 15 for cutting, the pressing rod 3 is pressed, and the pressing rod 3 drives the first spring 5 to compress, and at the same time drives the fixing rod 7 to move through the connecting plate 6 until one end of the fixing rod 7 is no longer movable and is installed in the first limiting groove 8. At this time, the pushing block 2 can be pushed, and the pushing block 2 drives the blade 15 to move through the first connecting block 4 and the first mounting box 10. When the blade 15 moves to the required position, the pressing rod 3 is released, and the first spring 5 extends to drive the fixing rod 7 to reset, thereby fixing the extended blade 15. The reverse operation can retract and reset the blade 15.

[0054] When the blade 15 needs to be replaced, the sealing card plate 19 is pulled outward, and the sealing card plate 19 drives the first card block 13 to move through the second magnetic block 18 and the first magnetic block 17. The first card block 13 takes out the blade 15 through the connecting groove through the second card block 14, and the blade 15 can be taken out from the fixed groove in the first card block 13 for replacement.

[0055] When it is necessary to switch the working state of the blade 15, when only the side edge of the blade 15 is needed, the cutting edge of the blade 15 can be used for cutting through the cutting groove 26 on the hidden baffle 25. At the same time, the hidden baffle 25 can hide other parts of the blade 15 to prevent accidental injury. When the tip of the blade 15 needs to be used, the movable plate 29 is removed, and the blocking rod 34 is taken out through the movable plate 29. At this time, when using the blade 15, pressing the blade 15 on the surface of the object can squeeze and cause the hidden baffle 25 to shrink, so that the tip of the blade 15 is exposed for use.

[0056] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A utility knife with a hidden blade, comprising a blade housing (1), Features: A movable groove (9) is provided on one side of the knife housing (1), a first connecting block (4) is movably installed in the movable groove (9), a push block (2) is fixedly connected to the outer side of the first connecting block (4), a first mounting hole is provided on the outer side of the push block (2), a pressing rod (3) is movably installed in the first mounting hole, and the pressing rod (3) is movably sleeved in the first connecting block (4), a first mounting box (10) is fixedly connected to one side of the first connecting block (4), and the pressing rod (3) is movably sleeved in the first mounting box (10), one end of the pressing rod (3) is fixedly connected to a first spring (5), a partition (11) is fixedly connected in the first mounting box (10), and one end of the first spring (5) is fixedly connected to the partition (11).

2. A utility knife with a concealed blade according to claim 1, Features: The outer side of the pressing rod (3) is fixedly sleeved with a connecting plate (6), and the connecting plate (6) is arranged in a first installation box (10). The inner side of the connecting plate (6) is equidistantly fixedly connected with two fixing rods (7). One side of the first installation box (10) is equidistantly provided with two second installation holes, and the two fixing rods (7) respectively pass through the two second installation holes. The inner side of the knife housing (1) is equidistantly provided with a plurality of first limiting grooves (8), and one end of the outer sides of the two fixing rods (7) are respectively movably installed in adjacent first limiting grooves (8).

3. A utility knife with a concealed blade according to claim 2, Features: A first clamping block (13) is movably installed inside the first installation box (10), and second limiting grooves (16) are provided on both sides of the first clamping block (13). First limiting blocks (12) are movably installed in two of the second limiting grooves (16), and the outer sides of the two first limiting blocks (12) are fixedly connected to the inner wall of the first installation box (10).

4. A utility knife with a concealed blade according to claim 3, Features: A fixing groove is provided on one side of the first clamping block (13), a blade (15) is movably mounted in the fixing groove, the first clamping block (13) is fixedly connected to a second clamping block (14) in the fixing groove, and the blade (15) is movably sleeved on the outer side of the second clamping block (14).

5. A utility knife with a concealed blade according to claim 4, Features: A first magnetic block (17) is fixedly connected to one side of the first clamping block (13); a second magnetic block (18) is magnetically attracted to the outer side of the first magnetic block (17); a sealing clamping plate (19) is fixedly connected to the outer side of the second magnetic block (18); a connecting groove is provided on one side of the knife housing (1); the second magnetic block (18) passes through the connecting groove; the sealing clamping plate (19) abuts against the outer wall of the knife housing (1); a limiting sleeve (22) is fixedly connected to the lower side of the knife housing (1); one end of the sealing clamping plate (19) is movably sleeved in the limiting sleeve (22); a third limiting groove (20) is provided on the inner side of the sealing clamping plate (19); a second limiting block (21) is movably installed in the third limiting groove (20); the inner side of the second limiting block (21) is fixedly connected to the knife housing (1).

6. A utility knife with a concealed blade according to claim 5, Features: A knife outlet (23) is provided on one side of the upper part of the knife housing (1); a mounting sleeve (24) is fixedly connected to one side of the knife outlet (23) on the upper part of the knife housing (1); a hidden baffle (25) is movably mounted in the mounting sleeve (24); and a cutting groove (26) is provided on one side of the hidden baffle (25).

7. A utility knife with a concealed blade according to claim 6, Features: Two fourth limiting grooves (30) are equidistantly provided on one side of the installation sleeve (24); two connecting rods are equidistantly fixedly connected to one side of the hidden baffle (25); the two connecting rods pass through the fourth limiting grooves (30) respectively; second connecting blocks (31) are fixedly connected to the outer sides of the two fourth limiting grooves (30); second springs (32) are fixedly connected to the lower sides of the two second connecting blocks (31); the knife housing (1) is fixedly connected to the lower sides of the two second springs (32); two second installation boxes (27) are equidistantly fixedly connected to the outer side of the installation sleeve (24); the two second installation boxes (27) are respectively arranged on the outer sides of the two second springs (32).

8. A utility knife with a concealed blade according to claim 7, Features: The inner sides of the two mounting sleeves (24) are fixedly connected to limiting rails (28), and movable plates (29) are clamped inside the two limiting rails (28). Third mounting holes are provided on both sides of the mounting sleeves (24), and the inner sides of the movable plates (29) are fixedly connected to blocking rods (34), and the blocking rods (34) pass through the two third mounting holes.

9. A method for using a utility knife with a hidden blade. Features: The utility knife with a hidden blade as described in any one of claims 1 to 8 is used, and the specific steps of use are as follows: S1. When in use, the user holds the knife housing (1) from the outside to use the utility knife; S2. When the blade (15) needs to be extended for cutting, the pressing rod (3) is pressed, and the push block (2) drives the blade (15) to move through the first connecting block (4) and the first mounting box (10), until the blade (15) moves to a desired position, and then the pressing rod (3) is released to fix the extended blade (15); S3. When the blade (15) needs to be replaced, the sealing clamp (19) is pulled outward, and the blade (15) can be taken out from the fixed groove in the first clamp block (13) for replacement; S4. When it is necessary to switch the working state of the blade (15), the movable plate (29) is removed, and the blocking rod (34) is taken out through the movable plate (29), so that the tip of the blade (15) is exposed for use.

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