A shear knife

Abstract

The present application relates to a shearing knife, comprising a first shearing arm and a second shearing arm, wherein the first shearing arm is provided with a first gripping portion and a first mounting portion, a blade is mounted on the first mounting portion, the second shearing arm is provided with a second gripping portion and a second mounting portion, the second mounting portion is provided with a supporting portion, a shearing space for accommodating objects to be sheared is provided between the blade and the supporting portion; a guiding portion is provided between the first mounting portion and the second mounting portion; the guiding portion can provide trajectory guidance for the movement of the blade; when the first shearing arm and the second shearing arm move toward each other, the movement of the blade includes at least two trajectories of movement in different directions; the shearing knife of the present application provides a downwardly inclined movement trajectory while moving downward, so that the surface of the object after cutting is smoother.

Description

Technical Field

[0001] The present application relates to the technical field of shearing tools, and in particular to a shearing knife. Background Art

[0002] Existing shearing knives are generally large handheld metal knives, which are generally used to cut strip-shaped objects. They are often large in size and have a large shearing force. However, for cutting small branches, using traditional large metal knives has many inconveniences. Taking the grafting work scene as an example, special grafting blades are generally required. Replacing the blade requires tools such as screwdrivers. In addition, large metal knives have a large operating stroke, and the cutting efficiency is not high, which causes many inconveniences during use.

[0003] In the scenario of grafting work, during the grafting process of small tender branches, the tightness of the incision fit is the key to the survival of the grafting. The tighter the fit, the higher the survival rate. Therefore, the angle of small tender branches during cutting is very critical. Usually, bevel cutting is adopted, which has a larger contact area and a better tightness of the incision fit. However, it is not easy to keep the angle consistent during the bevel cutting process. In addition, during the cutting process, since the tender branches are directly subjected to force, it will cause the phloem of the branches to remain intact, and the phloem and wood part will be torn, resulting in the inability of the scion and the rootstock to fit tightly. When workers use existing tools to cut, they often have to go through multiple cuts to obtain tender branches that meet the standards, which has the problem of low efficiency for a large number of grafting work. Summary of the invention

[0004] The purpose of the present application is to provide a novel shearing knife for solving the problem of low efficiency in the current shearing process of strip-shaped articles.

[0005] The technical solution of the present invention is: a shearing knife, comprising a first shearing arm and a second shearing arm,

[0006] A first mounting portion is disposed on a side of the first scissor arm close to the second scissor arm, and a first gripping portion is disposed on a side of the first scissor arm away from the second scissor arm;

[0007] A blade is mounted on the first mounting portion.

[0008] A second mounting portion is disposed on a side of the second scissor arm close to the first scissor arm, and a second gripping portion is disposed on a side of the second scissor arm away from the first scissor arm;

[0009] The second mounting portion is provided with a supporting portion, and a shearing space for accommodating an object to be sheared is provided between the blade and the supporting portion;

[0010] A guide portion is provided between the first mounting portion and the second mounting portion; the guide portion can provide a trajectory guide for the movement of the blade;

[0011] When the first scissor arm and the second scissor arm move toward each other, the movement of the blade includes at least two movement trajectories in different directions;

[0012] Preferably, the two motion trajectories in different directions include:

[0013] a first motion trajectory in a first direction which is the same as the direction in which the first scissor arm and the second scissor arm move toward each other;

[0014] and a second motion trajectory intersecting with the first motion trajectory, wherein the second motion trajectory is a motion trajectory sliding along the object to be cut.

[0015] Preferably, the shear knife is also provided with a movable part, which connects the first shear arm and the second shear arm respectively; one end of the movable part is connected to an end of the first shear arm away from the blade, and the other end of the movable part is connected to an end of the second shear arm away from the support part.

[0016] Preferably, the movable part includes a first movable part, a second movable part and a third movable part, the first movable part is hinged to the end of the first scissor arm away from the blade, the second movable part is hinged to the end of the second scissor arm away from the supporting part, and the third movable part connects the first movable part and the second movable part respectively, when the first scissor arm and the second scissor arm move toward each other in the first direction, the first movable part and the second movable part move in opposite directions in the second direction.

[0017] Preferably, the movable portion is provided with a pair of limiting portions, and an end of the first scissor arm away from the blade and an end of the second scissor arm away from the supporting portion are respectively inserted into the pair of limiting portions.

[0018] Preferably, the guide portion comprises: a guide shaft provided on the first mounting portion and a guide groove provided on the second mounting portion;

[0019] or a guide shaft provided on the second mounting portion and a guide groove provided on the first mounting portion;

[0020] The guide shaft is slidably mounted in the guide groove.

[0021] Preferably, a pair of guide shafts are provided, a pair of guide grooves are provided, and the pair of guide shafts are slidably installed in the pair of guide grooves.

[0022] Preferably, the first mounting portion is provided with a blade fixing portion, the blade fixing portion is provided with the blade, the blade fixing portion is provided with a guide shaft fixing portion away from the first mounting portion, and a pair of guide shafts are symmetrically mounted on the guide shaft fixing portion;

[0023] The support portion is symmetrically provided with a pair of guide grooves, a space for accommodating the guide shaft fixing portion is provided between the pair of guide grooves, and the guide shaft fixing portion and the pair of guide shafts can slide between the pair of guide grooves.

[0024] Preferably, the direction of the pair of guide grooves is to extend from an end of the support portion close to the first scissor arm to an end away from the first scissor arm, and at the same time extend in a direction close to the second mounting surface.

[0025] Preferably, an elastic element is provided between the first scissor arm and the second scissor arm, one end of the elastic element abuts against the first scissor arm, and the other end of the elastic element abuts against the second scissor arm.

[0026] Preferably, the elastic element is one of a spring, a metal spring, a plastic part, and a rubber part.

[0027] Compared with the prior art, the advantages of this application are:

[0028] (1) The present invention is provided with a guide shaft and a guide groove. When the first shear arm and the second shear arm apply a cutting force to the object to be cut, a downward cutting force can be provided while a sliding cutting force on the object to be cut is provided. In this way, the blade can slide and cut from the epidermis of the branch during the cutting process. Not only is the cutting angle perfect, the cutting is more labor-saving, and the integrity after cutting is ensured. For plant objects, the epidermis of the plant is not easily damaged.

[0029] (2) The guide portion of the present invention has guiding functions in at least two directions, one of which can provide a limit and fix the branch when the blade contacts the branch, and the other guide portion performs the shearing action in a sliding cutting manner, thereby improving the cutting effect.

[0030] (3) The present invention sets two hinge points for the first scissor arm and the second scissor arm, so that the first scissor arm and the second scissor arm can move relative to each other. Compared with the traditional design with only one hinge point or no hinge point, the direct one-piece molding design has multiple moving directions of the blade, making the shear knife more efficient in different application scenarios.

[0031] (4) In the process of the first scissor arm and the second scissor arm of the present invention moving toward each other, their rear ends will undergo relative displacement. The design of the movable portion limits the first scissor arm and the second scissor arm to lateral movement, thereby maintaining cutting stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The present application is further described below in conjunction with the accompanying drawings and embodiments:

[0033] Figure 1This is a schematic diagram of the overall structure of a shearing knife in this application;

[0034] Figure 2 This is a schematic diagram of the structure of a first shear arm in a shear knife of the present application;

[0035] Figure 3 This is a schematic diagram of the structure of a second shear arm in a shearing knife of the present application;

[0036] Figure 4 This is a schematic diagram of the structure of a support portion in a shearing knife of the present application;

[0037] Figure 5 This is a structural schematic diagram of a guide portion in a shearing knife of the present application;

[0038] Figure 6 This is a structural schematic diagram of a guide portion in a shearing knife of the present application;

[0039] Figure 7 This is a schematic diagram of the structure of a guide part in a shearing knife of this application

[0040] Figure 8 This is a schematic diagram of the overall structure of a shear knife in this application.

[0041] in:

[0042] 1. Shear knife;

[0043] 2. first scissor arm, 21. first hand-held portion, 22. first mounting portion;

[0044] 3. second scissor arm, 31. second hand-held portion, 33. second mounting portion;

[0045] 4. Blade fixing part, 41. Guide shaft fixing part,

[0046] 5. Blade;

[0047] 6. guide portion, 61. guide shaft, 62. guide groove, 611. first guide shaft, 612. second guide shaft, 621. first guide portion, 622. second guide portion, 623. third guide portion;

[0048] 7. Support part;

[0049] 8. Activities Department;

[0050] 9. Elastic element. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical scheme and advantages of the present application clearer, the embodiments of the present application will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiment is only one embodiment of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0052] "Embodiment" referred to herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present application. In the description of the embodiment of the present application, it should be understood that the terms "first", "second" and "third" etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first", "second" and "third" etc. may include one or more of the features explicitly or implicitly. Moreover, the terms "first", "second" and "third" etc. are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiment of the present application described here can be implemented in an order other than illustrated or described here. In addition, the terms "including" and "for" and any of their variations are intended to cover non-exclusive inclusions.

[0053] like Figure 1As shown, it is an overall schematic diagram of a shearing knife 1 provided in an embodiment of the present application, which is shaped like a stapler as a whole, including a first shearing arm 2 and a second shearing arm 3, the first shearing arm 2 and the second shearing arm 3 can be held by one hand, the first shearing arm 2 and the second shearing arm 3 are arranged opposite to each other, and the first shearing arm 2 is respectively provided with a first gripping portion 21 and a first mounting portion 22 in the positive and reverse directions, the first gripping portion 21 can be grasped by an operator, and a blade 5 is mounted on the first mounting portion 22. In another embodiment of the present application, a blade fixing portion 4 is provided at one end of the first shearing arm 2, and a blade 5 is fixedly mounted on the blade fixing portion 4. In the present application, a protrusion is provided on the blade fixing portion 4, and the protrusion is roughly in the shape of a long strip. A hole corresponding to the protrusion is opened on the blade 5. When assembling or replacing the blade 5, it is only necessary to install the hole on the blade 5 on the corresponding protrusion. Compared with the traditional method of fixing with screws, the efficiency is greatly improved, especially in the process of batch work, the improvement of work efficiency is particularly obvious. The second scissor arm 3 is provided with a second gripping portion 31 and a second mounting portion 32 in the forward and reverse directions, respectively. The second gripping portion 32 can be grasped by the operator with one hand at the same time as the first gripping portion 21, and anti-slip patterns are also provided on the first gripping portion 21 and the second gripping portion 32 to increase the friction with the operator's hand, making it easier to grasp and less likely to slip out of the hand. A guide portion 6 is provided between the first mounting portion 22 and the second mounting portion 32, and the guide portion 6 is used to provide guidance when the first scissor arm 2 and the second scissor arm 3 move toward each other.

[0054] like Figure 2-3 As shown, in one embodiment of the present application, the guide portion 6 includes a guide shaft 61 arranged on the first mounting portion 22 and a guide groove 62 installed on the second mounting portion 32, and the guide shaft 61 is slidably installed in the guide groove 62. When the operator holds the shear knife and holds the first shear arm 2 and the second shear arm 3 in the same direction and applies force, the guide shaft 61 slides in the guide groove 62 to provide a guiding effect, so that the blade 5 installed on the first shear arm 2 performs a shearing action in the direction provided by the guide portion 6.

[0055] In one embodiment of the present application, the guide shaft 61 is arranged on the blade fixing part 4, and the guide shaft fixing part 4 is integrally formed with the guide shaft fixing part 41 at one end of the blade fixing part 4 away from the first mounting part 22, and the guide shaft fixing part 41 is provided with a through hole, and the guide shaft 61 is installed on the guide shaft fixing part 41 through the through hole. In other embodiments, the guide shaft fixing part 41 can also be provided with two non-through holes, and the two guide shafts 61 are fixedly installed in the two non-through holes respectively. A support part 7 is provided at one end of the second shear arm 3, and the support part 7 can be used to support the object to be sheared. Since the support part 7 is closer to the first shear arm Arm 2, and the article to be sheared is located between the support portion 7 and the first shear arm 2, therefore, the provision of the support portion 7 reduces the shearing stroke of the shear knife 1, the support portion 7 may be an extension of the second shear arm 3, in the present embodiment, the support portion 7 and the second shear arm 3 are integrally formed, and in the height direction, that is, the height in the first direction in which the first shear arm 2 and the second shear arm 3 move toward each other is greater than the height of the second shear arm 3 in the first direction, thereby, a space is provided on the support portion 7 for opening a guide groove 62, the guide groove 62 is provided as a groove with an angle in the first direction, and the guide shaft 61 is slidably installed in the guide groove 62.

[0056] like Figure 4 As shown, the support portion 7 is provided with a V-groove area 71 and a cutting groove area 72, the cutting groove area 72 includes a first cutting groove area 721 and a second cutting groove area 722, the cutting grooves of the first cutting groove area 721 and the second cutting groove area 722 are arranged along a second direction which is the same as the axial direction of the second shear arm, the cutting grooves of the first cutting groove area 721 and the second cutting groove area 722 are passed through from one end of the support portion 7 away from the second shear arm 3 to the end of the support portion 7 close to the second shear arm 3, the cutting groove of the first cutting groove area 721 is arranged to be a space for accommodating the passage of the blade 5, one end of the second cutting groove area 722 is integrally formed with the first cutting groove area 721, and the other end is integrally formed with the second shear arm 3, and the second cutting groove area 722 is configured In order to allow the blade 5 to pass through and the guide shaft fixing portion 41 to pass through at the same time, when the object to be sheared is placed between the first shear arm 2 and the support portion 7, the operator can hold the shear knife 1 with one hand, and then simultaneously apply force to the first shear arm 2 and the second shear arm 3 in the direction of the object to be sheared, and the blade 5 cuts toward the inside of the object to be sheared. Due to the action of the guide shaft 61 and the guide groove 62, the blade 5 slides on the object to be sheared. At this time, the guide shaft fixing portion 41 passes through the second cutting groove area 722, and the blade 5 passes through the first cutting groove area 721. Therefore, the first cutting groove area 721 and the second cutting groove area 722 that are arranged through each other provide the necessary space for the blade to cut.

[0057] A V-groove area 71 is also provided between the first cutting groove area 721 and the second cutting groove area 722. The V-groove area 71 is configured to be a V-groove from the end surface of the support portion 7 close to the first shear arm 2 toward the direction of the support portion away from the first shear arm 2. The V-groove area 71 can be used to fix objects to be cut, such as branches, ropes, lines and other strip objects. In this embodiment, for the plant branches to be grafted, the V-groove area 71 can provide a standard angle, and the blade 5 cuts. During batch operations, the cutting angle is consistent, and production efficiency is improved.

[0058] like Figure 5 As shown, in another embodiment of the present application, the guide portion 6 is a conduit 63 arranged on the first mounting portion and a guide rod 62 arranged on the second mounting portion, or a conduit 63 on the second mounting portion and a guide rod 62 arranged on the first mounting portion, and the guide rod 62 is slidably installed in the conduit 63 and provides a guiding function during the process of the first scissor arm 2 and the second scissor arm 3 moving toward each other in the first direction.

[0059] In one embodiment of the present application, the first scissor arm 2 is integrally injection molded, the first gripping portion 21 is an arc surface, and the first mounting portion 22 is a plane. When the shear knife 1 is in use, the first gripping portion 21 can be moved in a specified direction by the operator by hand-holding, and the first mounting portion 22 is arranged on the opposite side of the gripping portion 21. The first mounting portion 22 is provided with a plurality of reinforcing ribs for increasing the strength of the first scissor arm 2. A blade fixing portion 4 is integrally molded at one end of the first scissor arm 2, and the blade fixing portion 4 is arranged on an extension line of the mounting portion 22. A blade 5 is fixedly mounted on the blade fixing portion 4, and the tip angle of the blade 5 is less than 60°, and the blade edge of the blade 5 has an angle with the horizontal direction of the first scissor arm 2. Based on the angle, the blade can gradually apply force to the surface of the object during shearing, and epidermal cracking is not likely to occur when shearing plant branches.

[0060] The second scissor arm 3 is integrally injection-molded, and the second gripping portion 31 is an arc surface, so that the operator can hold it with one hand when the shearing knife 1 is in use. A second mounting portion 32 is provided on a side of the second scissor arm 3 opposite to the second gripping portion 31, and a plurality of reinforcing ribs are provided on the second mounting portion 32. A supporting portion 7 is provided at one end of the second scissor arm 3, and the supporting portion 7 provides a supporting force when the blade 5 cuts the object to be sheared.

[0061] like Figure 6-7As shown, one end of the guide groove 62 is higher than the plane of the support portion 7 in the horizontal direction, and the guide groove 62 includes a first guide portion 621, a second guide portion 622 and a third guide portion 623. The guiding directions of the first guide portion 621 and the third guide portion 623 are different, and the first guide portion 621 transitions to the third guide portion 623 through the second guide portion 622.

[0062] In one installation method of the present embodiment, the guide shaft 61 is slidably installed in the guide groove 62. Before use, the operator is located in the first guide portion 621 of the guide groove 62. After the operator applies opposite forces to the first shear arm 2 and the second shear arm 3, the guide shaft 61 first moves downward for a stroke in the first guide portion 621, and then enters the second guide portion 622. In one embodiment of the present application, the shearing knife shears the branches. After the shearing knife 1 selects the branches, it places the branches between the blade 5 and the support portion 7. When the operator holds the shearing knife 1 with one hand and applies opposite forces to the first shear arm 2 and the second shear arm 3 (i.e., applies a force in the first direction), the guide shaft 61 moves in the first guide portion 621 in the first direction for a stroke. After the stroke process, it passes through the second guide portion 622 and starts to continue moving towards the third guide portion 623 in the second direction intersecting the first direction. At this time, the movement trajectory of the blade 5 is that the blade 5 first moves in the direction of the branch, and then the blade 5 slides to the second direction while cutting on the branch in the first direction, and continues cutting in the second direction for a stroke. At this time, the blade 5 continues to apply cutting force to the branch to complete the cutting of the branch. The force applied by the blade 5 on the branch is a progressive force contact bevel cutting method. When the blade 5 contacts the branch, it does not cut directly, but adopts a sliding cutting method. Finally, the phloem of the branch can be kept intact. At the same time, the sliding cutting is more labor-saving and the cut surface is more complete, which not only improves the production efficiency, but also improves the survival rate of the grafting.

[0063] In another embodiment of the present application, the guide shaft 61 is inserted into the guide shaft fixing portion 41, and the guide shaft 61 is arranged on both sides of the guide shaft fixing portion 41 as a first guide shaft 611 and a second guide shaft 612. Corresponding to the guide shaft 61, there is a pair of guide grooves 62 arranged on the support portion 7, which are symmetrically arranged on the support portion 7. The first guide shaft 611 and the second guide shaft 612 are respectively slidably installed in a pair of symmetrically arranged guide grooves 62. The direction of the pair of guide grooves 62 is to extend from one end of the support portion 7 close to the first scissor arm 2 to one end away from the first scissor arm 2, and at the same time extend in a direction close to the second mounting portion 33. In this embodiment, the starting position of the guide groove 62 is at one end of the support portion 7 close to the first scissor arm 2, and is higher than the end face close to the first scissor arm 2. It extends from the starting position to a direction away from the end face and close to the second mounting portion 33, that is, from the upper part of the support portion to the bottom and rear of the support portion. The symmetrically arranged pair of guide shafts 61 are slidably installed in the symmetrically arranged pair of guide grooves 62, and the guiding is more stable and the service life is longer.

[0064] A movable part 8 is movably connected to one end of the first scissor arm 2 away from the blade fixing part 4, and a movable part 8 is movably connected to one end of the second scissor arm 3 away from the supporting part 7. In the present embodiment, the movable part 8 is respectively connected to the first scissor arm 2 and the second scissor arm 3 by a hinged manner. In a traditional shear knife, a hinge point is generally set between the two scissor arms, and then the cutting of the object is achieved through the lever principle. In the present application, two hinge points are set between the first scissor arm 2 and the second scissor arm 3, so that the first scissor arm 2 and the second scissor arm 3 can move toward each other, thereby driving the blade to perform sliding cutting. In another embodiment of the present application, the movable part 8 is set as an elastic component, which is integrally formed with the first scissor arm 2 and the second scissor arm 3 respectively. The movable part 8 set by the elastic component can meet the needs of relative movement of the first scissor arm 2 and the second scissor arm 3. The present application also provides another implementation scheme for the movable part 8, wherein the movable part 8 is configured as a fixed block, the fixed block is provided with a pair of limiting parts, the pair of limiting parts are configured as a pair of through holes opened on the fixed block, one end of the first scissor arm 2 away from the blade 5 and one end of the second scissor arm 3 away from the support part 7 are respectively penetrated through the pair of limiting parts, based on the design of the limiting parts, the first scissor arm 2 and the second scissor arm 3 can move in the through holes, so as to provide the need for relative movement of the first scissor arm 2 and the second scissor arm 3.

[0065] An elastic element 9 is also provided between the first mounting portion 22 and the second mounting portion 32. In one embodiment of the present application, the elastic element 9 is a spring. Spring mounting portions are also integrally formed on the first mounting portion 22 and the second mounting portion 32, respectively. The two spring mounting portions are located between the cutter 5 and the movable portion 8, and the spring is mounted on the spring mounting portions. In another embodiment of the present application, the elastic element 9 is a metal spring, which can be a metal such as copper, steel, or aluminum. One end of the metal spring abuts against the first mounting portion 22, and the other end abuts against the second mounting portion 32. In other embodiments of the present application, the elastic element 9 can also be a material such as plastic or rubber that has buffering and reset functions.

[0066] In one embodiment of the present application, the shearing knife 1 is applied to the working scene of grafting. The operator holds the shearing knife 1 in one hand, presses the first shearing arm 2 with the thumb, and fixes the second shearing arm 3 with the other four fingers, places the branch in the V-groove 71 of the support part 7, and then exerts force with the fingers to move the first shearing arm 2 and the second shearing arm 3 toward each other. At this time, since the guide shaft 61 fixed on the first shearing arm 2 is slidably installed in the guide groove 62, the first shearing arm 2 is sliding on the branch in the process of moving toward the second shearing arm 3, and moves in the direction close to the movable part 8. The blade 5 moves toward the branch under the drive of the first shearing arm 2 and follows the movement trajectory of the guide shaft 61. In the process of cutting toward the center of the branch, it slides on the branch at the same time. Therefore, the blade 5 has both longitudinal cutting and sliding cutting in the cutting trajectory of the branch, and the cut branch has a smooth epidermis without wrinkling or cracking. The survival rate of grafting is higher.

[0067] The present invention is provided with a guide shaft and a guide groove. When the first shear arm and the second shear arm apply cutting force to the branch, a downward cutting force and an oblique rearward cutting force can be provided at the same time, so that the blade can slide and cut from the epidermis of the branch during the cutting process. Not only is the cutting angle perfect, but the integrity after cutting is also guaranteed. For large-scale grafting work scenarios, the survival rate of grafting is improved, and the production efficiency is also improved.

[0068] The above embodiments are only for illustrating the technical concept and features of the present application, and their purpose is to enable people familiar with this technology to understand the content of the present application and implement it accordingly, and they cannot be used to limit the scope of protection of the present application. For those skilled in the art, it is obvious that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or basic features of the present application. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present application is limited by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present application.

Claims

1. A shearing knife, comprising a first shearing arm and a second shearing arm, characterized in that: A first mounting portion is disposed on a side of the first scissor arm close to the second scissor arm, and a first gripping portion is disposed on a side of the first scissor arm away from the second scissor arm; A blade is mounted on the first mounting portion. A second mounting portion is disposed on a side of the second scissor arm close to the first scissor arm, and a second gripping portion is disposed on a side of the second scissor arm away from the first scissor arm; The second mounting portion is provided with a supporting portion, and a shearing space for accommodating an object to be sheared is provided between the blade and the supporting portion; A guide portion is provided between the first mounting portion and the second mounting portion, and the guide portion comprises: A guide shaft provided on the first mounting portion and a guide groove provided on the second mounting portion; or a guide shaft provided on the second mounting portion and a guide groove provided on the first mounting portion; The guide shaft is slidably mounted in the guide groove; The direction of the guide groove is from the end of the support portion close to the first scissor arm to the end away from the first scissor arm extending, while extending in the direction close to the second mounting portion; The guide portion can provide trajectory guidance for the movement of the blade; When the first scissor arm and the second scissor arm move toward each other, the movement of the blade includes at least two movement trajectories in different directions.

2. A shearing knife according to claim 1, characterized in that: The two motion trajectories in different directions include: a first motion trajectory in a first direction which is the same as the direction in which the first scissor arm and the second scissor arm move toward each other; and a second motion trajectory intersecting with the first motion trajectory, wherein the second motion trajectory is a motion trajectory sliding along the object to be cut.

3. A shearing knife according to claim 1, characterized in that: The shear knife is also provided with a movable part, which connects the first shear arm and the second shear arm respectively; one end of the movable part is connected to an end of the first shear arm away from the blade, and the other end of the movable part is connected to an end of the second shear arm away from the support part.

4. A shearing knife according to claim 3, characterized in that: The movable part includes a first movable part, a second movable part and a third movable part. The first movable part is hinged to an end of the first scissor arm away from the blade, the second movable part is hinged to an end of the second scissor arm away from the supporting part, and the third movable part connects the first movable part and the second movable part respectively. When the first scissor arm and the second scissor arm move toward each other in the first direction, the first movable part and the second movable part move in opposite directions in the second direction.

5. A shearing knife according to claim 3, characterized in that: The movable portion is provided with a pair of limiting portions, and one end of the first scissor arm away from the blade and one end of the second scissor arm away from the supporting portion are respectively inserted into the pair of limiting portions.

6. A shearing knife according to claim 1, characterized in that: A pair of guide shafts are provided, and a pair of guide grooves are provided. The pair of guide shafts are slidably installed in the pair of guide grooves.

7. A shearing knife according to claim 6, characterized in that: The first mounting portion is provided with a blade fixing portion, the blade fixing portion is provided with the blade, the blade fixing portion is provided with a guide shaft fixing portion away from the first mounting portion, and a pair of guide shafts are symmetrically mounted on the guide shaft fixing portion; The support portion is symmetrically provided with a pair of guide grooves, a space for accommodating the guide shaft fixing portion is provided between the pair of guide grooves, and the guide shaft fixing portion and the pair of guide shafts can slide between the pair of guide grooves.

8. A shearing knife according to any one of claims 1 to 7, characterized in that: An elastic element is arranged between the first scissor arm and the second scissor arm, one end of the elastic element abuts against the first scissor arm, and the other end of the elastic element abuts against the second scissor arm.

9. A shearing knife according to claim 8, characterized in that: The elastic element is one of a spring, a metal spring, plastic and rubber.

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