Pneumatic cutting tongs
By designing pneumatic cutting pliers and utilizing the lever principle of cylinder and linkage structure, the problem of existing gold cutting pliers requiring heavy force to cut thin chains or wires is solved, achieving labor-saving cutting pliers operation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANDONG VFOOK GOLD IND JEWELRY
- Filing Date
- 2025-07-12
- Publication Date
- 2026-06-23
AI Technical Summary
Existing gold-plated wire cutters require significant pressure to cut thinner chains or wires, making them inconvenient to use.
A pneumatic pliers has been designed, which uses a cylinder to drive the opening and closing of the pliers. Through the linkage structure and lever principle, the torque of the pliers when cutting gold chains or wires is reduced. The pliers include a combination of a cylinder, pliers, a linkage and a hinge connector. The extension and retraction of the cylinder piston rod drives the linkage structure to open and close the pliers.
This technology reduces the output force on the cylinder when cutting gold chains or wires, lowers the difficulty of operation, and can effectively cut hard gold materials.
Smart Images
Figure CN224389872U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of jewelry manufacturing technology, specifically a pneumatic shearing pliers. Background Technology
[0002] Karat gold is a precious metal alloy made by mixing gold with other metals such as silver, copper, and zinc in a certain proportion. This mixture improves the hardness, color, and durability of pure gold. It is mainly used to make jewelry, watches, and other decorative items. Karat gold jewelry is characterized by its high hardness, low cost, and resistance to deformation and wear. It can also be formulated in a variety of colors. Thinner karat gold chains or wires are generally cut using specialized cutting pliers. Due to the high hardness of karat gold, the shearing force required when cutting karat gold chains or wires is significant. Existing karat gold cutting pliers require considerable pressure to cut the chains or wires. Utility Model Content
[0003] This invention addresses the problem of applying significant pressure to the cutting pliers when cutting thin K-gold chains or wires, by providing a labor-saving pneumatic cutting pliers for cutting K-gold chains or wires.
[0004] To solve the above-mentioned technical problems, this utility model includes a pair of pliers. The pliers include a left jaw and a right jaw, which are hinged together by a pliers hinge shaft. Its structural features include: a cylinder with a bracket for mounting the pliers. The bracket is fixedly mounted on one side of the piston rod of the cylinder. The pliers are positioned on the bracket at the end away from the piston rod. The pliers hinge shaft is fixedly mounted on the bracket. The jaws of the pliers are away from the piston rod, and the handles are close to the piston rod. The piston rod is powered by two sets of connecting rod structures. Each set of connecting rod structures includes a first connecting rod and a second connecting rod. The two first connecting rods are close to each other. The ends of the shearing pliers are hinged to the bracket via a first connecting rod hinge axis fixed to the bracket. The ends of the two first connecting rods near the shearing pliers are respectively poweredly connected to the two handles of the shearing pliers via two second hinge connectors. The second hinge connectors are hinged to the first connecting rods and the handles. The first connecting rods extend outward from the first connecting rod hinge axis toward the cylinder. The end of the first connecting rod away from the shearing pliers is hinged to one end of the second connecting rod via a second connecting rod hinge axis. The other end of the second connecting rod is hinged to the piston rod. The length of the first connecting rod is greater than the distance between the shearing pliers hinge axis and the hinge point of the second hinge connector on the first connecting rod.
[0005] With the above structure, when using the pneumatic shears of this invention to cut thinner gold chains or wires, the extension or retraction of the cylinder piston rod causes the end of the second connecting rod hinged to the piston rod to move. The end of the second connecting rod hinged to the first connecting rod will also move, and the hinge joint between the first and second connecting rods will rotate relative to each other. This causes the first connecting rod to rotate about the hinge axis of the first connecting rod. The first connecting rod drives the two handles of the shears to rotate about the hinge axis of the shears through the second hinge connector, causing the jaws of the shears to open and form a "V" shaped jaw. The gold chain or wire to be cut is placed into the jaw, the piston rod of the cylinder moves in the opposite direction, and the jaws of the shears close. When the jaws close, the gold chain or wire is cut. Since the length of the first link is greater than the distance between the hinge point of the shearing pin and the second hinge connector on the first link, according to the lever principle, the lever arm length of the first link is greater than the length of the lever arm formed by the hinge point of the shearing pin and the second hinge connector on the first link. This reduces the torque exerted by the second link on the first link when the shearing pin cuts the gold chain or wire, reduces the power output of the cylinder, and enables the cylinder to drive the shearing pin to cut the gold chain or wire.
[0006] The second hinged connector is hinged to the end of the pliers handle.
[0007] The length of the pliers handle is greater than the length of the pliers jaws.
[0008] When the "V"-shaped jaws of the shears open and close, the extension and retraction length of the piston rod is greater than the movement distance of the hinge shaft of the second connecting rod.
[0009] The cylinder is equipped with two speed control valves that control the extension and retraction speed of the piston rod.
[0010] The distance between the shear hinge shaft and the cylinder is greater than the distance between the hinge point of the second hinge connector on the first connecting rod and the cylinder.
[0011] The axis of the piston rod is located on the center surface of the "V" shaped jaws formed after the shears open.
[0012] Two sets of connecting rod structures are symmetrically distributed on both sides of the center plane of the "V" shaped jaws.
[0013] This utility model discloses a pneumatic pliers that uses a cylinder as the power source. The cylinder drives the left and right handles of the pliers to rotate via two sets of connecting rods and a second hinged connector, causing the jaws of the pliers to open and close. When the jaws open, they form a jaw, allowing thin gold chains or wires to be placed into the jaws. When the jaws close, the gold chains or wires are cut. The connecting rod structure includes a first connecting rod and a second connecting rod. The end of the first connecting rod near the pliers is connected to the hinge shaft of the pliers fixed on a bracket, and the end of the first connecting rod near the pliers is poweredly connected to the handles of the pliers via the second hinged connector. The first connecting rod is located away from the pliers. One end of the first link is hinged to one end of the second link, and the other end of the second link is hinged to the piston rod of the cylinder. The cylinder-driven opening and closing connection structure of the pliers utilizes the lever principle. The length of the first link is greater than the distance between the hinge axis of the pliers and the hinge point of the second hinge connector on the first link. The length of the pliers handle is greater than the length of the pliers jaws. When the "V"-shaped jaws of the pliers open and close, the extension and retraction length of the piston rod is greater than the movement distance of the hinge axis of the second link. Through the above design, the torque output by the cylinder when cutting gold chains or wires is reduced, making it possible to cut hard gold chains or wires with the cylinder. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the structure of the pneumatic shears of this utility model;
[0015] Figure 2 (a) is a front view of the pneumatic shears. Figure 2 (b) is Figure 2 (a) View from direction A;
[0016] Figure 3 A front view of the pneumatic shears to show the connection structure and internal cylinder structure;
[0017] Figure 4 (a) is a schematic diagram of the support plate and the shear clamp mounting plate. Figure 4 (b) is a schematic diagram of the combination of the two support plates and the shear clamp mounting plate in use;
[0018] Figure 5 (a) is a schematic diagram of the first link, the second link, the first hinged connector, the second hinged connector, and the cutting pliers. Figure 5 (b) is a schematic diagram of the combination of the first link, the second link, the first hinged connector, the second hinged connector, and the cutting pliers in use;
[0019] Figure 6 This is a schematic diagram of the opening and closing process of pneumatic shears;
[0020] In the diagram: 1. Cylinder; 11. Cylinder body; 12. Piston; 13. Piston rod; 131. Piston rod connector; 14. Speed control valve; 2. Bracket; 21. Support plate; 211. First through hole; 212. First elongated hole; 213. Second elongated hole; 214. Mounting hole; 22. Pliers mounting plate; 221. Second through hole; 222. Third through hole; 3. Pliers; 31. Left pliers body; 311. Left jaw; 312. Left handle; 313. Fourth through hole; 32. Right pliers body; 321. Right jaw; 322. Right handle; 323. Fifth through hole 33. Pliers hinge shaft; 4. First connecting rod; 41. Sixth through hole; 42. Seventh through hole; 43. Eighth through hole; 5. First connecting rod hinge shaft; 6. Second connecting rod; 61. Ninth through hole; 62. Tenth through hole; 7. First hinge connector; 71. Eleventh through hole; 8. Second connecting rod hinge shaft; 9. Second hinge connector; 91. Twelfth through hole; 92. Thirteenth through hole; 10. Connecting plate. Detailed Implementation
[0021] Reference Figure 1-6 A pneumatic shearing pliers includes a cylinder 1, shearing pliers 3, and a connecting structure between the cylinder 1 and the shearing pliers 3. The cylinder 1 has a bracket 2 for mounting the shearing pliers 3 and the connecting structure. The cylinder 1 drives the jaws of the shearing pliers 3 to open and close. The cylinder 1 includes a hollow cylinder body 11, inside which is a reciprocating piston 12. The piston 12 is fixedly connected to a piston rod 13. The cylinder body 11 has two speed regulating valves 14 for controlling the extension and retraction speed of the piston rod 13. The structure of the cylinder 1 is prior art. The cylinder 1 has a fixed bracket 2, which is located on one side of the piston rod 13. The shearing pliers 3 and the connecting structure are mounted on the bracket 2. Figure 5 As shown, the pliers 3 includes a left jaw 31 and a right jaw 32, which are hinged together by a pliers hinge shaft 33. The left jaw 31 includes a left jaw 311 and a left handle 312, and the right jaw 32 includes a right jaw 321 and a right handle 322. When the left handle 312 and the right handle 322 rotate about the pliers hinge shaft 33, the left jaw 311 and the right jaw 321 open and close. When the jaws open, they form a "V" shaped jaw, into which a thin gold chain or wire is placed. When the jaws close, the gold chain or wire is cut.
[0022] Reference Figure 1-6 The shearing pliers 3 are positioned on the bracket 2 at the end furthest from the piston rod 13, such as... Figure 2 , 3 As shown, the piston rod 13 of cylinder 1 extends upwards, the bracket 2 is fixedly connected to the upper end of cylinder body 11, the shear pliers 3 is located at the upper end of bracket 2, and a connecting plate 10 is also provided on cylinder body 11. The connecting plate 10 is used for the fixed connection of cylinder 1, for example, fixing cylinder 1 to the frame, thereby achieving overall positioning of the pneumatic shear pliers; Figure 2-4 As shown, the bracket 2 includes two identical support plates 21 and two shear mounting plates 22. The two support plates 21 are arranged side by side with a gap in the middle for installing the connection structure between the piston rod 13 and the shear 3. The shear mounting plates 22 are fixedly connected to the top of the support plates 21. A gap is also left between the two shear mounting plates 22 for installing the shear 3. The shear hinge shaft 33 of the shear 3 is fixedly installed on the shear mounting plate 22. The shear mounting plate 22 has a second through hole 221 for the shear hinge shaft 33 to pass through. The jaws of the shear 3 face upwards, that is, the jaws are away from the piston rod 13 and the handles are close to the piston rod 13. The bracket 2 can also take other forms, such as not having a shear mounting plate 22, and the shear 3 is directly installed on the support plates 21, as long as the shear 3 and the connection structure can be installed. Figure 2As shown in (a), 3, and 6, the axis of piston rod 13 is located on the central surface of the "V"-shaped jaws formed when the pliers 3 are opened. The central surface of the "V"-shaped jaws in this invention refers to a plane perpendicular to the plane containing the "V" and passing through the axis of symmetry of the "V". The connection structure between piston rod 13 and pliers 3 includes two sets of connecting rods. Piston rod 13 drives the left jaw 312 and right jaw 322 to rotate through these two sets of connecting rods. The two sets of connecting rods are symmetrically distributed on both sides of the central surface of the "V"-shaped jaws. This symmetrical design allows the piston rod 13 to extend and retract... The rotation angles of the pliers handles are the same, and the forces on the two sets of linkage structures are more balanced. Each set of linkage structures includes a first linkage 4 and a second linkage 6. The end of the first linkage 4 near the pliers 3 is connected to the first linkage hinge shaft 5. The first linkage hinge shaft 5 is fixedly connected to the bracket 2, so that the first linkage 4 is hinged to the bracket 2 through the first linkage hinge shaft 5. Specifically, the end of the first linkage 4 near the pliers 3, the support plate 21, and the pliers mounting plate 22 are respectively provided with a sixth through hole 41, a first through hole 211, and a third through hole 222 through which the first linkage hinge shaft 5 passes.The ends of the two first connecting rods 4 near the shearing pliers 3 are respectively powered to the left handle 312 and the right handle 322 via a double rocker structure. Specifically, the ends of the two first connecting rods 4 near the shearing pliers 3 are connected to the ends of the left handle 312 and the right handle 322 respectively via two second hinge connectors 9. The end of the handle refers to the end away from the hinge axis 33 of the shearing pliers. The second hinge connectors 9 are located below the hinge axis 5 of the first connecting rods, that is, the distance between the hinge axis 33 of the shearing pliers and the cylinder 1 is greater than the distance between the hinge point of the second hinge connector 9 on the first connecting rod 4 and the cylinder 1, thereby achieving... The effect is that when the piston rod 13 extends outward, the jaws of the pliers 3 close, cutting the gold chain or wire. When the piston rod 13 retracts inward, the jaws of the pliers 3 open, which is more in line with the usage of the cylinder 1. The second hinged connector 9 is hinged to both the end of the first connecting rod 4 near the pliers 3 and the end of the pliers handle. The end of the first connecting rod 4 near the pliers 3 has a seventh through hole 42. The second hinged connector 9 has a twelfth through hole 91 communicating with the seventh through hole 42. The end of the left pliers handle 312 has a fourth through hole 313, and the end of the right pliers handle 322 has a... A fifth through hole 323 is provided, and a thirteenth through hole 92 is also provided on the second hinge connector 9. One of the thirteenth through holes 92 on the second hinge connector 9 communicates with the fourth through hole 313, and the other thirteenth through hole 92 on the second hinge connector 9 communicates with the fifth through hole 323. A hinge shaft passes through the seventh through hole 42 and the twelfth through hole 91, the fourth through hole 313 and the thirteenth through hole 92, and the fifth through hole 323 and the thirteenth through hole 92. The length between the first connecting rod hinge shaft 5 and the seventh through hole 42, the second hinge... The connecting piece 9 and the pliers handle form a double rocker structure. When the first connecting rod 4 rotates about the first connecting rod hinge shaft 5, the double rocker structure drives the pliers handle to rotate, thereby opening and closing the jaws of the pliers 3. The support plate 21 has a first elongated hole 212, which corresponds to the position of the second hinge connecting piece 9. The first elongated hole 212 facilitates the passing of tools through the screws during installation. During use, the hinge part may protrude outward, and the first elongated hole 212 provides space for the movement of the hinge part. The first connecting rod 4 extends outward from the first connecting rod hinge shaft 5 towards the cylinder 1, for example; Figure 3As shown, the first connecting rod 4 is inclined downward and outward from the first connecting rod hinge shaft 5. The end of the first connecting rod 4 away from the shear pliers 3 is hinged to one end of the second connecting rod 6 through the second connecting rod hinge shaft 8. The other end of the second connecting rod 6 is hinged to the piston rod 13. The first connecting rod 4 and the second connecting rod 6 can adopt a plate structure, with one plate for the first connecting rod 4 and two plates for the second connecting rod 6. The first connecting rod 4 at the hinge point is sandwiched between the two plates of the second connecting rod 6. Specifically, an eighth through hole 43 is opened on the end of the first connecting rod 4 away from the shear pliers 3, and a ninth through hole 61 communicating with the eighth through hole 43 is opened on the second connecting rod 6. The second connecting rod hinge shaft 8 passes through the eighth through hole 43 and the ninth through hole 61. The support plate 21 has a connection with the second connecting rod. The second elongated hole 213 corresponds to the position of the hinge shaft 8. The function of the second elongated hole 213 is the same as that of the first elongated hole 212. The end of the piston rod 13 is provided with a piston rod connector 131. The end of the second connecting rod 6 near the piston rod 13 is connected to the piston rod connector 131 through the first hinge connector 7. Specifically, the end of the second connecting rod 6 near the piston rod 13 is provided with a tenth through hole 62. The first hinge connector 7 is provided with an eleventh through hole 71 that communicates with the tenth through hole 62. The hinge shaft passes through the tenth through hole 62, the eleventh through hole 71 and the piston rod connector 131. The support plate 21 is also provided with a mounting hole 214. The function of the mounting hole 214 is the same as that of the first elongated hole 212 and the second elongated hole 213. To reduce the force output by cylinder 1 when cutting thin gold chains or wires, the connecting structure utilizes the lever principle and employs multiple force-saving designs. Specifically, the length of the first connecting rod 4 is greater than the distance between the hinge point of the pliers hinge shaft 33 and the second hinge connector 9 on the first connecting rod 4, that is, the length of the first connecting rod 4 is greater than the distance between the pliers hinge shaft 33 and the seventh through hole 42; the length of the pliers handle is greater than the length of the pliers jaws; when the "V" shaped jaws of the pliers 3 open and close, the extension and retraction length of the piston rod 13 is greater than the movement distance of the second connecting rod hinge shaft 8. All of the above designs apply a small torque to the long lever arm to drive the short lever arm to move, thereby achieving a force-saving effect.
[0023] Instructions for use: When using the pneumatic pliers of this invention to cut thinner gold chains or wires, firstly, the piston rod 13 of the cylinder 1 retracts. The piston rod 13 drives the first connecting rod 4 to rotate around the hinge shaft 5 of the first connecting rod via the second connecting rod 6. When the first connecting rod 4 rotates, it drives the handle of the pliers 3 to rotate around the hinge shaft 33 of the pliers via the double rocker structure, causing the jaws to open and form a "V" shaped jaw. The gold chain or wire to be cut is placed into the jaw, and the piston rod 13 extends outward, causing the jaws to close, thereby cutting the gold chain or wire. Through the above-mentioned multiple labor-saving designs, the pneumatic pliers of this invention can cut gold chains or wires using only the cylinder 1 as the power source.
[0024] This utility model of pneumatic shears uses a cylinder as the power to drive the opening and closing of the shears. The piston rod of the cylinder is connected to the shears through a connecting structure. The connecting structure utilizes the lever principle to carry out multiple force-saving designs, reducing the power output of the cylinder when cutting gold chains or wires, and is able to cut thinner gold chains or wires.
Claims
1. A pneumatic shearing clamp, comprising shearing clamps (3), the shearing clamps (3) comprising a left clamp body (31) and a right clamp body (32), the left clamp body (31) and the right clamp body (32) being hinged together by a shearing clamp hinge shaft (33), characterized in that: It also includes a cylinder (1), on which a bracket (2) for mounting the pliers (3) is provided. The bracket (2) is fixedly mounted on one side of the piston rod (13) of the cylinder (1). The pliers (3) are located on the bracket (2) at one end away from the piston rod (13). The pliers hinge shaft (33) is fixedly mounted on the bracket (2). The jaws of the pliers (3) are away from the piston rod (13), and the handles are close to the piston rod (13). The piston rod (13) is powered by two sets of connecting rod structures. Each set of connecting rod structures includes a first connecting rod (4) and a second connecting rod (6). The ends of the two first connecting rods (4) near the pliers (3) are connected to the bracket (2) via the first connecting rod hinge shaft (5) fixed on the bracket (2). The two first connecting rods (4) are hinged. The ends of the two first connecting rods (4) near the pliers (3) are connected to the two handles of the pliers (3) through two second hinge connectors (9). The second hinge connectors (9) are hinged to the first connecting rods (4) and the handles. The first connecting rods (4) extend outward from the first connecting rod hinge shaft (5) toward the cylinder (1). The end of the first connecting rod (4) away from the pliers (3) is hinged to one end of the second connecting rod (6) through the second connecting rod hinge shaft (8). The other end of the second connecting rod (6) is hinged to the piston rod (13). The length of the first connecting rod (4) is greater than the distance between the hinge point of the pliers hinge shaft (33) and the second hinge connector (9) on the first connecting rod (4).
2. The pneumatic shears according to claim 1, characterized in that: The second hinged connector (9) is hinged to the end of the handle of the pliers (3).
3. The pneumatic shears according to claim 2, characterized in that: The length of the handle of the cutting pliers (3) is greater than the length of the jaws.
4. The pneumatic shears according to claim 1, characterized in that: When the "V"-shaped jaws of the shears (3) open and close, the extension and retraction length of the piston rod (13) is greater than the movement distance of the second connecting rod hinge shaft (8).
5. The pneumatic shears according to claim 1, characterized in that: The cylinder (1) is equipped with two speed control valves (14) that control the extension and retraction speed of the piston rod (13).
6. The pneumatic shears according to claim 1, characterized in that: The distance between the shear hinge shaft (33) and the cylinder (1) is greater than the distance between the hinge point of the second hinge connector (9) on the first connecting rod (4) and the cylinder (1).
7. The pneumatic shears according to claim 1, characterized in that: The axis of the piston rod (13) is located on the center surface of the "V" shaped jaws formed after the shears (3) open.
8. The pneumatic shears according to claim 1, characterized in that: Two sets of connecting rod structures are symmetrically distributed on both sides of the center plane of the "V" shaped jaws.