Labor-saving cutting pliers

Abstract

The invention discloses labor-saving shearing pliers, and relates to the technical field of shearing pliers, the labor-saving shearing pliers comprise two plier head pressing plates, symmetrical plier head pins are arranged between the two plier head pressing plates, the plier head pressing plates are rotatably provided with two shearing tool bits through the two plier head pins respectively, and the plier head pins are located in the middles of the shearing tool bits. According to the labor-saving shearing pliers, by means of the eccentric structure characteristic of the eccentric screw, on the premise that the acting force applied by an operator is kept unchanged, the force arm parameter can be adjusted, the final output force transmitted to the cutting edge of the shearing tool bit is remarkably enhanced, therefore, the shearing requirements of various workpieces are easily met, the design target of labor-saving operation is practically achieved, and the labor-saving effect is achieved. The labor intensity of operators is reduced, the mutual insertion depth between the first plier handle and the second plier handle is adjusted firstly, then the fixing nut is screwed down along the fixing threaded column in a threaded mode, the first plier handle and the second plier handle are fixed through friction force of the fixing nut, and the effect of adjusting the length of the plier handle assembly is achieved.

Description

Technical Field

[0001] This invention relates to the field of shearing pliers technology, and more specifically, to a labor-saving shearing pliers. Background Technology

[0002] Shearing pliers are manual or power tools designed based on the lever principle. Common shearing pliers on the market typically consist of a shearing head, a first connecting piece, a second connecting piece, screws, nuts, and handle assemblies. The two shearing blades in the shearing head are movably connected to the first and second connecting pieces via screws and nuts. Two sets of handle assemblies are fixedly connected to the first and second connecting pieces, respectively. During actual shearing operations, the operator applies a closing force to the handle assembly. This force, amplified by the mechanical effect of the two-stage lever, ultimately forms an output force at the cutting edge of the shearing head to cut the workpiece, thus completing the shearing operation. However, throughout the entire process… During the shearing process, since the force and lever arm applied by the operator are fixed, the output force is also fixed. When shearing some large workpieces, the constant output force is difficult to efficiently break through the shear strength of the workpiece. The operator needs to apply more manpower to complete the shearing, which not only significantly increases the labor intensity of the hands and arms, easily causing fatigue, but also leads to a significant decrease in shearing efficiency. It may even cause problems such as blade misalignment and workpiece slippage due to uneven force application, affecting the safety of operation and the quality of shearing. Secondly, there are some labor-saving shearing pliers on the market, but their complex structure and many parts increase the difficulty of production, resulting in low output, high scrap rate, and difficult assembly, which seriously increases costs. Summary of the Invention

[0003] In order to overcome the above-mentioned defects of the prior art, the present invention provides a force-saving shearing pliers to solve the problems in the background art.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a labor-saving shearing pliers, comprising two clamping plates, wherein symmetrical clamping pins are provided between the two clamping plates, and two shearing heads are rotatably mounted on the clamping plates through the two clamping pins, wherein the clamping pins are located in the middle of the shearing heads, and the tail ends of the two shearing heads are respectively connected to a first connecting component and a second connecting component by eccentric screws, wherein the first connecting component and the second connecting component are connected by eccentric screws, and a clamping handle component is fixedly connected to the tail ends of both the first connecting component and the second connecting component; The clamp assembly includes a first clamp and a second clamp, which are slidably connected to each other. An adjustment slide rail is provided on the second clamp. One end of the first clamp is fixedly connected to a fixed threaded post that passes through the adjustment slide rail, and a fixed nut is threaded onto the fixed threaded post.

[0005] Preferably, the first connecting component includes a first connector, which is connected to a first clamp handle. The first connector has a first mounting hole on one side of the slotted portion of its head and a first threaded hole on the other side. The first connector also has a second mounting hole on the unslotted portion of its head.

[0006] Preferably, the second connecting component includes a second connector, which is connected to another first clamp handle. The second connector has a third mounting through hole and a fourth mounting through hole on one side of the slotted portion, and a second threaded hole and a third threaded hole on the other side.

[0007] Preferably, the diameters of the first mounting hole, the second mounting hole, the third mounting hole, and the fourth mounting hole are different from the diameter of the shearing blade head and tail hole.

[0008] Preferably, the first mounting hole, the second mounting hole, the third mounting hole, and the fourth mounting hole are located on the same side, and the first threaded hole, the second threaded hole, and the third threaded hole are located on the same side.

[0009] Preferably, there are three eccentric screws, each of which includes a central cylinder, an eccentric cylinder, a stud body, and a locking cap. The locking cap, central cylinder, eccentric cylinder, and stud body are connected in sequence, and the diameter of the central cylinder is larger than the diameter of the eccentric cylinder. The centers of the central cylinder and the stud body are the same, and the eccentric cylinder is located at the eccentricity of the central cylinder and the stud body.

[0010] Preferably, the first eccentric screw passes sequentially through the first mounting hole, the tail hole of the shearing head, and the first threaded hole, with the central cylinder of this eccentric screw movably installed in the first mounting hole. The eccentric cylinder is located in the tail hole of the shearing head, and the screw body is threadedly connected to the first threaded hole. The second eccentric screw passes sequentially through the third mounting hole, the tail hole of another shearing head, and the second threaded hole, with the central cylinder of this eccentric screw movably installed in the third mounting hole. The eccentric cylinder is movably installed in the tail hole of another shearing head, and the screw body is threadedly connected to the second threaded hole. The third eccentric screw passes sequentially through the fourth mounting hole, the second mounting hole, and the third threaded hole, with the central cylinder of this eccentric screw movably installed in the fourth mounting hole. The eccentric cylinder is movably installed in the second mounting hole, and the screw body is threadedly connected to the third threaded hole. A nut is installed at the end of each screw body.

[0011] Compared with the prior art, the beneficial effects of the present invention are: The labor-saving shearing pliers of this invention have a simple overall structure and a streamlined number of core functional components, avoiding complex and redundant component designs. The processing technology of the parts is relatively simple, and mass production can be achieved without high-precision special equipment, which can effectively improve the production efficiency and output of the factory. At the same time, the assembly process is simple and easy to understand, which greatly reduces the labor and time costs of assembly. Furthermore, by utilizing the eccentric structure characteristics of the eccentric screw, the lever arm parameters can be dynamically adjusted while the force applied by the operator remains constant, so that the final output force transmitted to the cutting edge of the shearing head is significantly enhanced. This allows it to easily meet the shearing needs of various workpieces, effectively achieving the design goal of labor-saving operation and reducing the labor intensity of operators.

[0012] The labor-saving cutting pliers of the present invention first adjust the insertion depth between the first and second pliers, and then tighten the fixing nut along the thread of the fixing thread post. The friction of the fixing nut is used to fix the first and second pliers, thereby achieving the effect of adjusting the length of the pliers assembly. It has the advantages of a wider range of labor-saving, more flexible adaptation to different scenarios, and stronger operational adaptability. Attached Figure Description

[0013] Figure 1 This is a front view of the main structure of the present invention; Figure 2 This is a front view of the first connector structure of the present invention; Figure 3 For the present invention Figure 2 Sectional view of the structure at point AA; Figure 4 This is a schematic diagram of the second connector structure of the present invention; Figure 5 For the present invention Figure 4 Structural cross-section view at point BB; Figure 6 This is a side view of the eccentric screw structure of the present invention; Figure 7 This is a front view of the eccentric screw structure of the present invention; Figure 8 This is a schematic diagram of the stress analysis of the main structure of the present invention.

[0014] Figure label: 1. Pliers head clamping plate; 2. Pliers head pin; 3. Cutting blade; 4. First connecting assembly; 41. First connector; 42. First mounting hole; 43. First threaded hole; 44. Second mounting hole; 5. Second connecting assembly; 51. Second connector; 52. Third mounting hole; 53. Second threaded hole; 54. Fourth mounting hole; 55. Third threaded hole; 6. Eccentric screw; 61. Center cylinder; 62. Eccentric cylinder; 63. Screw body; 64. Anti-loosening cap; 7. Pliers handle assembly; 71. First handle; 72. Second handle; 73. Adjusting slide rail; 74. Fixed threaded post; 75. Fixed nut. Detailed Implementation

[0015] To make the technical problems, technical solutions and advantages of the present invention clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0016] As attached Figure 1 To be continued Figure 8 An embodiment of the present invention provides a labor-saving shearing pliers, including two clamping plates 1, with symmetrical clamping pins 2 disposed between the two clamping plates 1. Two shearing heads 3 are rotatably mounted on the clamping plates 1 via the two clamping pins 2, with the clamping pins 2 located at the center of each shearing head 3. The tail ends of the two shearing heads 3 are respectively connected to a first connecting assembly 4 and a second connecting assembly 5 via eccentric screws 6, and the first connecting assembly 4 and the second connecting assembly 5 are connected to each other via eccentric screws 6. Clamping handle assemblies 7 are fixedly connected to the tail ends of both the first connecting assembly 4 and the second connecting assembly 5. The user applies pressure to the two clamping handle assemblies 7. The force can cause the two corresponding eccentric screws 6 to drive the tail ends of the two shearing heads 3 to move away from each other, while the head ends of the two shearing heads 3 move closer to each other to achieve the shearing effect. Furthermore, by setting the eccentric screws 6, the power arm can be gradually raised during the shearing process, while the resistance arm can be gradually reduced, thereby achieving the effect of saving effort. The clamp handle assembly 7 includes a first clamp handle 71 and a second clamp handle 72, which are slidably inserted into each other. An adjustment slide rail 73 is provided on the second clamp handle 72. A fixed threaded post 74 that passes through the adjustment slide rail 73 is fixedly connected to one end of the first clamp handle 71, and a fixed nut 75 is threadedly connected to the fixed threaded post 74.

[0017] Specifically, by first adjusting the insertion depth between the first clamp handle 71 and the second clamp handle 72, and then tightening the fixing nut 75 along the threaded post 74, the friction of the fixing nut 75 is used to fix the first clamp handle 71 and the second clamp handle 72, thus achieving the effect of adjusting the length of the clamp handle assembly 7. Within the adjustable range of the clamp handle assembly 7 length, the power arm can be further increased by extending the clamp handle assembly 7, resulting in a wider range of labor-saving capabilities. The labor-saving effect is more significant when shearing workpieces with extremely high resistance. Secondly, the short handle configuration is convenient for operation in confined spaces, while the long handle configuration is suitable for shearing with high resistance, balancing flexibility and practicality. Furthermore, operators with different strengths can adjust the length of the clamp handle assembly 7 according to their own situation, lowering the operating threshold and providing strong operational adaptability.

[0018] Preferably, the first connecting assembly 4 includes a first connector 41, which is connected to a first clamp handle 71. The first connector 41 has a first mounting hole 42 on one side of its slotted head and a first threaded hole 43 on the other side. A second mounting hole 44 is formed on the unslotted portion of the first connector 41's head. The second connecting assembly 5 includes a second connector 51, which is connected to another first clamp handle 71. The second connector 51 has a third mounting hole 52 and a fourth mounting hole 54 on one side of its slotted head, and a second threaded hole 53 and a third threaded hole 55 on the other side. The diameters of the first mounting hole 42, the second mounting hole 44, the third mounting hole 52, and the fourth mounting hole 54 are different from the diameter of the tail hole of the shearing head 3. The first mounting hole 42, the second mounting hole 44, the third mounting hole 52, and the fourth mounting hole 54 are located on the same side. The first threaded hole 43, the second threaded hole 53, and the third threaded hole 55 are located on the same side. There are three eccentric screws 6. Each of the three eccentric screws 6 includes a central cylinder 61, an eccentric cylinder 62, a stud body 63, and a lock-on cap 64. The lock-on cap 64, the central cylinder 61, the eccentric cylinder 62, and the stud body 63 are connected in sequence. The diameter of cylinder 61 is larger than the diameter of eccentric cylinder 62. The centers of the central cylinder 61 and the stud body 63 are the same, and the eccentric cylinder 62 is located at the eccentricity of the central cylinder 61 and the stud body 63. The first eccentric screw 6 passes through the first mounting hole 42, the tail hole of the shearing head 3, and the first threaded hole 43 in sequence. The central cylinder 61 of this eccentric screw 6 is movably installed in the first mounting hole 42, and the eccentric cylinder 62 is located in the tail hole of the shearing head 3. The stud body 63 is threadedly connected to the first threaded hole 43. The second eccentric screw 6 passes through the third mounting hole 52, the tail hole of another shearing head 3, and the second threaded hole 43 in sequence. The eccentric screw 6 has a threaded hole 53, and the central cylinder 61 of the eccentric screw 6 is movably installed in the third mounting through hole 52. The eccentric cylinder 62 is movably installed in the tail hole of another shearing head 3. The stud body 63 is threadedly connected to the second threaded hole 53. The third eccentric screw 6 passes through the fourth mounting through hole 54, the second mounting through hole 44, and the third threaded hole 55 in sequence. The central cylinder 61 of the eccentric screw 6 is movably installed in the fourth mounting through hole 54. The eccentric cylinder 62 is movably installed in the second mounting through hole 44. The stud body 63 is threadedly connected to the third threaded hole 55. Nuts are installed at the ends of the stud body 63.

[0019] The force analysis of the labor-saving effect of the present invention is as follows: Level 1 leverage: The end of the clamp handle assembly 7 is designated as the point where the user's hand applies force. The applied force at this point is F1, which is the initial power source for the entire shearing system. The eccentric screw 6 at the connection between the first connecting assembly 4 and the second connecting assembly 5 serves as the fulcrum. Here, the eccentric screw 6 is designated as the third eccentric screw 6. The two eccentric screws 6 at the connection between the first connecting assembly 4, the second connecting assembly 5, and the two shearing heads 3 serve as the output points. Here, the eccentric screws 6 are designated as the first and second eccentric screws 6. Let the applied force at the end of the clamp handle assembly 7 be F1, the distance from the applied force point at the end of the clamp handle assembly 7 to the third eccentric screw 6 be L1, the output force at the first and second eccentric screws 6 be F2, and the distance from the third eccentric screw 6 to the first and second eccentric screws 6 be L2. Then: The input torque M1 is: M1 = F1 * L1, and the output torque M2 is: M2 = F2 * L2. Since M1 = M2, then: F2 = F1 * L1 / L2; Secondary leverage: Taking the first and second eccentric screws 6 as the points of application of force, the pliers pin 2 as the fulcrum, the applied force as F3, the distance from the first and second eccentric screws 6 to the pliers pin 2 as L3, the output force as F4, the distance from the pliers pin 2 to the tip of the shearing head 3 as L4, and the angle between the direction of the applied force F3 and the direction of the output force F2 at the same position as the first-stage lever as α, then: F3 = F2 * cosα = F1 * L1 * cosα / L2, Input torque M3 = F3 * L3 = F1 * L1 * cosα * L3 / L2, output torque M4 = F4 * L4, M3 = M4, then: F4 = F1 * L1 * cosα * L3 / L2 * L4 F1 represents the applied force. L3 and L4 are unaffected by the eccentric screw 6, and all three values ​​are constant. L1, α, and L2 are constantly changing. Affected by the eccentric screw 6, at a suitable position, the value of L1 increases, the value of L2 decreases, and the value of α decreases. Calculations using the formula show that the decrease in the value of α has a very small effect on the value of cosα, which can be ignored. However, the increase in the value of L1 and the decrease in the value of L2 ultimately increase F4, achieving the effect of saving effort.

[0020] The working principle of this invention is as follows: When using shearing pliers to cut a workpiece, the center of the tail hole of the shearing head 3 is eccentrically distributed with the centers of the first mounting hole 42 and the third mounting hole 52. At the same time, the center of the second mounting hole 44 is also offset from the center of the fourth mounting hole 54. When the operator opens the shearing pliers, due to the eccentric structure of the eccentric screw 6, the centers of the connection positions of the shearing head 3, the first connecting component 4, and the second connecting component 5 cannot be on the same straight line. Furthermore, the centers of the first mounting hole 42 and the third mounting hole 52 will be located outside the center of the tail hole of the shearing head 3. This eccentric layout allows the pliers handle assembly 7 to obtain a larger opening angle during rotation. When the shearing pliers cut a workpiece, the function of the eccentric screw 6 is to change the values ​​of the power arm and the resistance arm through the eccentric cylinder 62. As the pliers handle assembly 7 rotates, the power arm gradually increases, the resistance arm gradually decreases, and the output force gradually increases, achieving the labor-saving effect of the shearing pliers and avoiding insufficient opening range due to structural limitations, thereby adapting to the shearing needs of larger workpieces.

[0021] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change. Secondly: The accompanying drawings of the embodiments disclosed in this invention only involve the structures involved in the embodiments disclosed in this invention. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this invention can be combined with each other. In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A labor-saving shearing pliers, comprising two clamping plates (1), wherein symmetrical clamping pins (2) are disposed between the two clamping plates (1), and two shearing heads (3) are rotatably mounted on the clamping plates (1) respectively via the two clamping pins (2), wherein the clamping pins (2) are located at the middle of the shearing heads (3), characterized in that, The tail ends of the two shearing heads (3) are respectively connected to a first connecting component (4) and a second connecting component (5) by an eccentric screw (6), and the first connecting component (4) and the second connecting component (5) are connected by an eccentric screw (6). The tail ends of the first connecting component (4) and the second connecting component (5) are fixedly connected to a clamping handle component (7). The clamp assembly (7) includes a first clamp (71) and a second clamp (72), the first clamp (71) and the second clamp (72) are slidably connected to each other, the second clamp (72) is provided with an adjustment slide rail (73), one end of the first clamp (71) is fixedly connected with a fixed threaded post (74) that passes through the adjustment slide rail (73), and a fixed nut (75) is threadedly connected to the fixed threaded post (74).

2. The labor-saving shearing pliers according to claim 1, characterized in that, The first connecting component (4) includes a first connector (41), which is connected to a first clamp (71). A first mounting through hole (42) is provided on one side of the slotted part of the head of the first connector (41), and a first threaded hole (43) is provided on the other side. A second mounting through hole (44) is provided on the unslotted part of the head of the first connector (41).

3. The labor-saving shearing pliers according to claim 2, characterized in that, The second connecting component (5) includes a second connector (51), which is connected to another first clamp (71). The second connector (51) has a third mounting through hole (52) and a fourth mounting through hole (54) on one side of the slotted portion, and a second threaded hole (53) and a third threaded hole (55) on the other side.

4. The labor-saving shearing pliers according to claim 3, characterized in that, The diameters of the first mounting hole (42), the second mounting hole (44), the third mounting hole (52), and the fourth mounting hole (54) are different from the diameter of the tail hole of the shearing head (3).

5. The labor-saving shearing pliers according to claim 3, characterized in that, The first mounting hole (42), the second mounting hole (44), the third mounting hole (52), and the fourth mounting hole (54) are located on the same side, and the first threaded hole (43), the second threaded hole (53), and the third threaded hole (55) are located on the same side.

6. The labor-saving shearing pliers according to claim 3, characterized in that, There are three eccentric screws (6). Each of the three eccentric screws (6) includes a central cylinder (61), an eccentric cylinder (62), a stud body (63), and a lock-off cap (64). The lock-off cap (64), central cylinder (61), eccentric cylinder (62), and stud body (63) are connected in sequence. The diameter of the central cylinder (61) is larger than the diameter of the eccentric cylinder (62). The centers of the central cylinder (61) and the stud body (63) are the same, and the eccentric cylinder (62) is located at the eccentricity of the central cylinder (61) and the stud body (63).

7. The labor-saving shearing pliers according to claim 6, characterized in that, The first eccentric screw (6) passes sequentially through the first mounting hole (42), the tail hole of the shearing head (3), and the first threaded hole (43). The central cylinder (61) of this eccentric screw (6) is movably installed in the first mounting hole (42), the eccentric cylinder (62) is located in the tail hole of the shearing head (3), and the stud body (63) is threadedly connected to the first threaded hole (43). The second eccentric screw (6) passes sequentially through the third mounting hole (52), the tail hole of another shearing head (3), and the second threaded hole (53). The central cylinder (61) of this eccentric screw (6) is movably installed in the third mounting hole (42). Inside the through hole (52), the eccentric cylinder (62) is movably installed in the tail hole of another shearing head (3). The stud body (63) is threadedly connected to the second threaded hole (53). The third eccentric screw (6) passes through the fourth mounting through hole (54), the second mounting through hole (44), and the third threaded hole (55) in sequence. The central cylinder (61) of this eccentric screw (6) is movably installed in the fourth mounting through hole (54), the eccentric cylinder (62) is movably installed in the second mounting through hole (44), and the stud body (63) is threadedly connected to the third threaded hole (55). Nuts are installed at the ends of the stud body (63).

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