Clamp head assembly with limiting function and pneumatic scissors

Abstract

The invention discloses a plier head assembly with a limiting function and pneumatic scissors. The plier head assembly with the limiting function comprises a first plier body and a second plier body. The second plier body is rotationally connected with the first plier body through a pin shaft, a first blade is arranged on the side, opposite to the second plier body, of the first plier body, a second blade is arranged on the side, opposite to the first plier body, of the second plier body, and the first blade and the second blade are matched to form a shearing area. The first pincer body is provided with a first limiting column, the second pincer body is provided with a first containing groove, the first limiting column is located at the front end of the first blade, and the first containing groove is located at the front end of the second blade. When the first clamp body and the second clamp body rotate relatively to be closed, the first limiting column is inserted into the first containing groove, and the rear side wall of the first limiting column can prevent the stub bar from sliding forwards out of the shearing area. The tong head assembly with the limiting function is simple in structure and high in practicability.

Description

Technical Field

[0001] This invention relates to the field of scissors technology, and more particularly to a pliers head assembly with a limiting mechanism and pneumatic scissors. Background Technology

[0002] Pneumatic shears are widely used in the injection molding industry, electronics manufacturing, and hardware processing, primarily for cutting the sprue (commonly known as sprue) of plastic products, metal wires, or electronic leads. Existing pneumatic shears typically consist of a pneumatic body and two relatively moving blades mounted at the front end of the body. However, in actual operation, traditional blades often have straight or simple arc-shaped cutting edges. When cutting sprues with high hardness, large diameter, or smooth surfaces, the shearing force generates an outward component as the blade closes. This component easily causes the sprue to slide along the cutting edge towards the blade tip, resulting in slippage. Once slippage occurs, the sprue will leave the optimal shearing force arm area, or even slide directly out of the blade edge, leading to problems such as incomplete cutting, uneven cuts, or stringing. Summary of the Invention

[0003] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, this invention proposes a clamping head assembly with a limiting mechanism and pneumatic scissors.

[0004] In a first aspect, embodiments of the present invention provide a pliers assembly with a limiting mechanism, the pliers assembly with the limiting mechanism comprising: First clamp body; The second clamp body is rotatably connected to the first clamp body by a pin. The first clamp body has a first cutting edge on one side opposite to the second clamp body, and the second clamp body has a second cutting edge on one side opposite to the first clamp body. The first cutting edge and the second cutting edge cooperate to form a cutting zone. The first clamp body is provided with a first limiting post, and the second clamp body is provided with a first receiving groove. The first limiting post is located at the front end of the first blade, and the first receiving groove is located at the front end of the second blade. When the first clamp and the second clamp rotate relative to each other and close, the first limiting post is inserted into the first receiving groove, and the rear side wall of the first limiting post can prevent the material head from sliding forward out of the shearing zone.

[0005] According to some embodiments of the present invention, the first clamp body is provided with a second limiting post, and the second clamp body is provided with a second receiving groove. The second limiting post is located at the rear end of the first blade, and the second receiving groove is located at the rear end of the second blade. When the first clamp body and the second clamp body rotate relative to each other and close, the second limiting post is inserted into the second receiving groove, and the front sidewall of the second limiting post can prevent the material head from sliding backward out of the shearing zone.

[0006] According to some embodiments of the present invention, the first limiting post, the first blade, the second limiting post and the pin are distributed sequentially from front to back along the length direction of the first clamp body.

[0007] According to some embodiments of the present invention, the extending direction of the first limiting post is perpendicular to the extending direction of the first blade.

[0008] According to some embodiments of the present invention, the first limiting post is integrally formed with the first clamp body, or the first limiting post is welded to the first clamp body; the second limiting post is integrally formed with the first clamp body, or the second limiting post is welded to the first clamp body.

[0009] According to some embodiments of the present invention, when the first blade and the second blade are in contact, the lower end of the first limiting post has a gap with the bottom of the first receiving groove, and the lower end of the second limiting post has a gap with the bottom of the second receiving groove.

[0010] According to some embodiments of the present invention, when the first limiting post and the second limiting post are cylindrical, the diameter of the first limiting post is smaller than the width of the first receiving groove, and the diameter of the second limiting post is smaller than the width of the second receiving groove.

[0011] According to some embodiments of the present invention, when the first limiting post and the second limiting post are square columns, the width of the first limiting post is smaller than the width of the first receiving groove, and the width of the second limiting post is smaller than the width of the second receiving groove.

[0012] According to some embodiments of the present invention, the first receiving groove, the second cutting edge, the second receiving groove and the pin are distributed sequentially from front to back along the length direction of the second clamp body; the extension direction of the second limiting post is perpendicular to the extension direction of the first cutting edge.

[0013] Secondly, embodiments of the present invention also provide a pneumatic scissors, including a limiting pliers assembly according to the first aspect embodiment described above.

[0014] The clamping head assembly with limiting function according to embodiments of the present invention has at least the following technical effects: 1. The first limiting post and the first receiving groove cooperate with each other. At the start or during the shearing action, the first limiting post is simultaneously inserted into the first receiving groove and is located in front of the first and second cutting edges. When the material head is squeezed and tends to slide forward, it will be blocked by the first limiting post, forcing the material head to stay within the shearing zone, ensuring a smooth shearing in one go, and improving shearing quality and efficiency.

[0015] 2. The cooperation of the first and second limiting posts allows for simultaneous limiting at both ends of the shearing zone, restricting the material head from sliding in the front-to-back direction. It also effectively resists the torque generated during shearing, preventing misalignment or twisting of the first and second clamping bodies, avoiding abnormal wear on the first and second cutting edges, and extending their service life. This design is simple in structure, highly practical, and suitable for automated shearing scenarios in injection molding.

[0016] The pneumatic shears according to embodiments of the present invention have at least the following technical advantages: The pneumatic shears employ a clamping head assembly with a limiting feature. A first limiting post cooperates with a first receiving groove. At the start or during the shearing action, the first limiting post is simultaneously inserted into the first receiving groove and positioned in front of the first and second cutting edges. When the material head is squeezed and tends to slide forward, it is blocked by the first limiting post, forcing the material head to remain within the shearing zone, ensuring a smooth cut in one pass, and improving shearing quality and efficiency.

[0017] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the structure of a clamp head assembly with a limiting function according to some embodiments of the present invention; Figure 2 This is a schematic diagram of the closed structure of the first and second clamps according to some embodiments of the present invention; Figure 3 This is a schematic diagram of the structure of the first and second clamps in some embodiments of the present invention with the clamps open.

[0019] Icon labels: First clamp body 100; first blade 110; first limiting post 121; second limiting post 122; Second clamp body 200; second blade 210; first receiving groove 221; second receiving groove 222; Shearing zone 300; pin 310; material head 320. Detailed Implementation

[0020] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0021] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0022] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0023] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0024] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0025] According to some embodiments of the present invention, with reference to Figures 1 to 3 The clamp head assembly with limiting includes a first clamp body 100 and a second clamp body 200. The second clamp body 200 is rotatably connected to the first clamp body 100 via a pin 310. The first clamp body 100 has a first cutting edge 110 on one side opposite to the second clamp body 200, and the second clamp body 200 has a second cutting edge 210 on one side opposite to the first clamp body 100. The first cutting edge 110 and the second cutting edge 210 cooperate to form a cutting zone 300. Both the first cutting edge 110 and the second cutting edge 210 are located in front of the pin 310, with the first cutting edge 110 positioned above the second cutting edge 210. The first clamp body 100 has a first limiting post 121, and the second clamp body 200 has a first receiving groove 221. The first limiting post 121 is located at the front end of the first cutting edge 110, and the first receiving groove 221 is located at the front end of the second cutting edge 210. When the first clamp 100 and the second clamp 200 rotate and close relative to each other, the first blade 110 and the second blade 210 fit together, the first limiting post 121 is inserted into the first receiving groove 221, and the rear side wall of the first limiting post 121 can prevent the material head 320 from sliding forward out of the shearing zone 300.

[0026] Understandably, the first limiting post 121 cooperates with the first receiving groove 221. During the shearing action, the first limiting post 121 is simultaneously inserted into the first receiving groove 221 and positioned in front of the first cutting edge 110 and the second cutting edge 210. The material head 320 located in the shearing zone 300 tends to slide forward under pressure. The first limiting post 121 has already partially inserted into the first receiving groove 221, thereby preventing the material head 320 from sliding forward and forcing it to remain within the shearing zone 300, ensuring a smooth shearing in one go and improving shearing quality and efficiency.

[0027] Preferably, the rear sidewall of the first limiting post 121 is a plane, thereby increasing the contact area between the first limiting post 121 and the material head 320, preventing the material head 320 from rotating or tipping over when obstructed. This confines the material head 320 within the shearing zone 300, ensuring that the material head 320 is always in the position where the blade is sharpest and the shearing force is strongest, thus obtaining a smooth and even cross-section and avoiding uneven cuts caused by slippage.

[0028] According to some embodiments of the present invention, with reference to Figures 1 to 3 The first clamp body 100 is provided with a second limiting post 122, and the second clamp body 200 is provided with a second receiving groove 222. The second limiting post 122 is located at the rear end of the first blade 110, and the second receiving groove 222 is located at the rear end of the second blade 210. When the first clamp body 100 and the second clamp body 200 rotate relative to each other and close, the second limiting post 122 is inserted into the second receiving groove 222, and the front side wall of the second limiting post 122 can prevent the material head 320 from sliding backward out of the shearing zone 300.

[0029] Understandably, under certain complex automated operating conditions, such as when the robotic arm's feeding position deviates or the shape of the material head 320 is irregular, the material head 320 may also be squeezed backward. The second limiting post 122 can prevent the material head 320 from moving backward and leaving the shearing zone 300. The cooperation of the first limiting post 121 and the second limiting post 122 can simultaneously limit the material head 320 at both ends of the shearing zone 300, restricting it from sliding in the front-back direction.

[0030] Preferably, in some embodiments, when the first limiting post 121 is inserted into the first receiving groove 221 and the second limiting post 122 is inserted into the second receiving groove 222, the first limiting post 121 and the second limiting post 122 are respectively restricted from moving in the left and right directions by the first receiving groove 221 and the second receiving groove 222, thereby effectively resisting the torque generated during shearing, preventing the first clamp body 100 and the second clamp body 200 from being misaligned or twisted, avoiding abnormal wear on the first cutting edge 110 and the second cutting edge 210, and extending the service life of the cutting edge.

[0031] Understandably, when shearing high-hardness materials, the reaction force attempts to push the first clamp 100 and the second clamp 200 apart in a direction perpendicular to the shearing plane, i.e., away in the left-right direction, resulting in a gap between the first blade 110 and the second blade 210. However, because the first limiting post 121 is inserted into the first receiving groove 221 and the second limiting post 122 is inserted into the second receiving groove 222, the movement of the two clamps 100 and 200 in the left-right direction is restricted, greatly enhancing the overall torsional rigidity of the clamp head assembly. This ensures that the blades always maintain a tightly fitted shearing state, preventing premature failure due to blade misalignment and chipping.

[0032] In some embodiments, refer to Figure 2 and Figure 3 The first receiving groove 221 and the second receiving groove 222 both penetrate the second clamp body 200 in the left and right direction. The first receiving groove 221 and the second receiving groove 222 do not restrict the first limiting post 121 and the second limiting post 122 from moving in the left and right direction, which facilitates cleaning the debris in the first receiving groove 221 and the second receiving groove 222.

[0033] Preferred, refer to Figures 1 to 3 In the figure, the first limiting post 121, the first cutting edge 110, the second limiting post 122, and the pin 310 are distributed sequentially from front to back along the length of the first clamp body 100. The extension direction of the first limiting post 121 is perpendicular to the extension direction of the first cutting edge 110.

[0034] Preferred, refer to Figures 1 to 3 The first limiting post 121 is integrally formed with the first clamp body 100, or the first limiting post 121 is welded to the first clamp body 100. The second limiting post 122 is integrally formed with the first clamp body 100, or the second limiting post 122 is welded to the first clamp body 100.

[0035] The one-piece molding process has extremely high structural strength, eliminates the risk of connection point failure, is suitable for heavy-duty shearing scenarios, and has good appearance consistency.

[0036] The welding process provides flexibility in material selection. For example, the first clamp body 100 can be made of alloy steel with good toughness to withstand impact, while the first limiting post 121 and the second limiting post 122 can be made of materials with higher hardness, such as cemented carbide, to withstand repeated impact and wear of the material head 320. It also facilitates individual replacement and repair after the first limiting post 121 or the second limiting post 122 is damaged, reducing maintenance costs.

[0037] Preferred, refer to Figures 1 to 3When the first blade 110 and the second blade 210 are in contact, the lower end of the first limiting post 121 has a gap with the bottom of the first receiving groove 221, and the lower end of the second limiting post 122 has a gap with the bottom of the second receiving groove 222. This ensures that the first limiting post 121 and the second limiting post 122 will not collide or interfere when the first blade 110 and the second blade 210 are in contact.

[0038] Understandably, since the first clamp 100 and the second clamp 200 move in a circular motion around the pin 310, if the bottom of the first limiting post 121 and the bottom of the second limiting post 122 are stuck at the bottom of the groove, it will directly cause the blade to be unable to close completely, resulting in continuous shearing. Moreover, as the pneumatic shears are used for a long time, the blade will wear down and need to be re-grinded. Grinding will reduce the blade thickness or change the closing stroke. The reserved bottom gap can accommodate such stroke changes caused by wear or re-grinding, ensuring that the first limiting post 121 and the second limiting post 122 will never interfere with the normal closing of the first cutting edge 110 and the second cutting edge 210 during the tool's lifespan.

[0039] Preferred, refer to Figure 2 When the first limiting post 121 and the second limiting post 122 are cylindrical, the diameter of the first limiting post 121 is L3, the width of the first receiving groove 221 is L1, and L3 is less than L1. The diameter of the second limiting post 122 is L4, the width of the second receiving groove 222 is L2, and L4 is less than L2. This ensures that during the rotational closing process of the first clamp 100 and the second clamp 200, the first limiting post 121 can be smoothly inserted into the first receiving groove 221, and the second limiting post 122 can be smoothly inserted into the second receiving groove 222, avoiding collision interference.

[0040] Or, refer to Figure 2 When the first limiting post 121 and the second limiting post 122 are square prisms, the width of the first limiting post 121 is L3, the width of the first receiving groove 221 is L1, and L3 is less than L1. The width of the second limiting post 122 is L4, the width of the second receiving groove 222 is L2, and L4 is less than L2. This ensures that during the rotational closing process of the first clamp 100 and the second clamp 200, the first limiting post 121 can be smoothly inserted into the first receiving groove 221, and the second limiting post 122 can be smoothly inserted into the second receiving groove 222, avoiding collision interference.

[0041] Understandably, the difference between L1 and L3 constitutes a lateral fitting clearance, as does the difference between L2 and L4. This lateral fitting clearance can accommodate machining errors and accommodate the movement trajectory of the first clamp 100 and the second clamp 200 during opening and closing. If the clearance is too small, the side walls of the first limiting post 121 and the second limiting post 122 are prone to scraping or jamming against the groove walls of the first receiving groove 221 and the second receiving groove 222, respectively. An appropriate clearance ensures smooth insertion while limiting the lateral twisting range of the clamps.

[0042] Preferred, refer to Figures 1 to 3 The first receiving groove 221, the second cutting edge 210, the second receiving groove 222, and the pin 310 are distributed sequentially from front to back along the length of the second clamp body 200. The extension direction of the second limiting post 122 is perpendicular to the extension direction of the first cutting edge 110.

[0043] In the description of this specification, the reference to the term "some embodiments" means that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0044] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A jaw assembly with a stop, characterized in that, The utility model relates to a cutting device for cutting material head, comprising: a first jaw (100); a second jaw (200) rotatably connected with the first jaw (100) through a pin shaft (310), the first jaw (100) is provided with a first blade (110) on the side opposite to the second jaw (200), the second jaw (200) is provided with a second blade (210) on the side opposite to the first jaw (100), and the first blade (110) and the second blade (210) cooperate to form a cutting area (300); the first jaw (100) is provided with a first limiting column (121), the second jaw (200) is provided with a first accommodating groove (221), the first limiting column (121) is located at the front end of the first blade (110), and the first accommodating groove (221) is located at the front end of the second blade (210); when the first jaw (100) and the second jaw (200) are relatively rotated and closed, the first limiting column (121) is inserted into the first accommodating groove (221), and the rear side wall of the first limiting column (121) can block the material head (320) from sliding out of the cutting area (300) to the front.

2. The jaw assembly with a limiter of claim 1, wherein, the first jaw (100) is provided with a second limiting column (122), the second jaw (200) is provided with a second accommodating groove (222), the second limiting column (122) is located at the rear end of the first blade (110), and the second accommodating groove (222) is located at the rear end of the second blade (210); when the first jaw (100) and the second jaw (200) are relatively rotated and closed, the second limiting column (122) is inserted into the second accommodating groove (222), and the front side wall of the second limiting column (122) can block the material head (320) from sliding out of the cutting area (300) to the rear.

3. The jaw assembly with a limiter of claim 2, wherein, the first limiting column (121), the first blade (110), the second limiting column (122) and the pin shaft (310) are sequentially arranged from front to back along the length direction of the first jaw (100).

4. The jaw assembly with a limiter of claim 3, wherein, the extension direction of the first limiting column (121) is perpendicular to the extension direction of the first blade (110).

5. The jaw assembly with a limiter of claim 4, wherein, the first limiting column (121) is integrally formed with the first jaw (100), or the first limiting column (121) is welded to the first jaw (100); the second limiting column (122) is integrally formed with the first jaw (100), or the second limiting column (122) is welded to the first jaw (100).

6. The jaw assembly with a limiter of claim 2, wherein, when the first blade (110) and the second blade (210) are abutted, the lower end of the first limiting column (121) has a gap with the groove bottom of the first accommodating groove (221), and the lower end of the second limiting column (122) has a gap with the groove bottom of the second accommodating groove (222).

7. The jaw assembly with a limiter of claim 2, wherein, When the first limiting column (121) and the second limiting column (122) are in a cylindrical shape, a diameter of the first limiting column (121) is less than a slot width of the first accommodating slot (221), and a diameter of the second limiting column (122) is less than a slot width of the second accommodating slot (222).

8. The jaw assembly with a limiter of claim 2, wherein, When the first limiting column (121) and the second limiting column (122) are in a square column shape, a width of the first limiting column (121) is less than a slot width of the first accommodating slot (221), and a width of the second limiting column (122) is less than a slot width of the second accommodating slot (222).

9. The jaw assembly with a limiter of claim 2, wherein, The first accommodating slot (221), the second blade (210), the second accommodating slot (222) and the pin shaft (310) are sequentially arranged along a length direction of the second pliers body (200) from front to back; and an extending direction of the second limiting column (122) is perpendicular to an extending direction of the first blade (110).

10. A pneumatic shear characterized by, The pliers head assembly with limiting comprises the pliers head assembly with limiting according to any one of claims 1 to 9.

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