Labor-saving cutting pliers

Abstract

The utility model discloses a labor -saving cutting nippers relates to cutting nippers technical field, including two compression pads, the symmetrical pin is provided between two compression pads, and two cutter heads are rotatably installed with two pins through two pins respectively, and the pin is located in the middle part of cutter head, and the tail end of two cutter heads is connected with left connecting assembly and right connecting assembly through eccentric screw respectively, and left connecting assembly and right connecting assembly are connected through eccentric screw, and the tail of left connecting assembly and right connecting assembly is fixedly connected with the pincer component. The utility model discloses labor -saving cutting nippers simple structure, few parts, little production difficulty, high output, simple assembly and lower cost, through the effect of three eccentric screws, under the condition that the same force is applied, the output force increases, reaches the purpose of saving the labor.

Description

Technical Field

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

[0002] Ordinary shearing pliers on the market consist of a blade head, a left connector, a right connector, screws, nuts, and plier handle assemblies. The left blade in the blade head is movably connected to the left connector via screws and nuts, and the right blade is movably connected to the right connector via screws and nuts. The two plier handle assemblies are fixedly connected to the left and right connectors. When shearing a workpiece, force is applied to the plier handle assembly, and through the action of a two-stage lever, an output force is generated at the cutting edge of the blade head to shear the workpiece. Since the applied force and lever arm are fixed throughout the shearing process, the output force is also fixed. When shearing large workpieces, operators will clearly feel the strain when using shearing pliers, which affects work efficiency. Utility Model Content

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

[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a labor-saving shearing pliers, comprising two pressure plates, with symmetrical pins arranged between the two pressure plates. Two cutting heads are rotatably mounted on the pressure plates via the two pins, and the pins are located in the middle of the cutting heads. The tail ends of the two cutting heads are respectively connected to a left connecting assembly and a right connecting assembly via eccentric screws, and the left connecting assembly and the right connecting assembly are connected to each other via eccentric screws. A plier handle is fixedly connected to the tail ends of the left connecting assembly and the right connecting assembly.

[0005] Preferably, the left connecting component includes a left connector, wherein a first through hole is provided on one side of the slotted portion of the head of the left connector, a first threaded hole is provided on the other side, and a second through hole is provided on the unslotted portion of the head of the left connector.

[0006] Preferably, the right connecting component includes a right connecting member, wherein a third through hole and a fourth through hole are provided on one side of the slotted portion of the right connecting member, and a second threaded hole and a third threaded hole are provided on the other side.

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

[0008] Preferably, the first through hole, the second through hole, the third through hole, and the fourth through 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 cylinder, an eccentric cylinder, a stud, and a cap. The cap, cylinder, eccentric cylinder, and stud are connected in sequence, and the diameter of the cylinder is larger than the diameter of the eccentric cylinder. The cylinder and the stud have the same center, and the eccentric cylinder is located at the eccentric point between the cylinder and the stud.

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

[0011] Compared with the prior art, the beneficial effects of this utility model are: The labor-saving shearing pliers of this utility model have a simple structure, few parts, low production difficulty, high output, simple assembly and low cost. Through the action of three eccentric screws, the output force is increased under the same applied force, thus achieving the purpose of labor saving. Attached Figure Description

[0012] Figure 1 This is a front view of the main structure of this utility model; Figure 2 This is a front view of the left connecting member structure of this utility model; Figure 3 This utility model Figure 2 Sectional view of the structure at point AA; Figure 4 This is a schematic diagram of the right connector structure of this utility model; Figure 5 This utility model Figure 4 Structural cross-section view at point BB; Figure 6 This is a side view of the relevant structure of the eccentric screw of this utility model; Figure 7 This is a front view of the relevant structure of the eccentric screw of this utility model; Figure 8 This is a schematic diagram of the stress analysis of the main structure of this utility model.

[0013] Figure label: 1. Pressure plate; 2. Pin; 3. Cutter head; 4. Left connecting assembly; 41. Left connector; 42. First through hole; 43. First threaded hole; 44. Second through hole; 5. Right connecting assembly; 51. Right connector; 52. Third through hole; 53. Second threaded hole; 54. Fourth through hole; 55. Third threaded hole; 6. Eccentric screw; 61. Cylinder; 62. Eccentric cylinder; 63. Stud; 64. Cap; 7. Pliers handle. Detailed Implementation

[0014] To make the technical problems, technical solutions and advantages of this utility model clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0015] As attached Figure 1 To be continued Figure 8 This utility model provides a labor-saving shearing pliers, including two pressure plates 1, with symmetrical pins 2 between the two pressure plates 1. Two blades 3 are rotatably mounted on the pressure plates 1 via the two pins 2, and the pins 2 are located in the middle of the blades 3. The tail ends of the two blades 3 are respectively connected to a left connecting component 4 and a right connecting component 5 via eccentric screws 6, and the left connecting component 4 and the right connecting component 5 are connected to each other via eccentric screws 6. Pliers handles 7 are fixedly connected to the tail ends of the left connecting component 4 and the right connecting component 5.

[0016] Preferably, the left connecting component 4 includes a left connecting member 41. A first through hole 42 is provided on one side of the slotted portion of the head of the left connecting member 41, and a first threaded hole 43 is provided on the other side. A second through hole 44 is provided on the unslotted portion of the head of the left connecting member 41.

[0017] Preferably, the right connecting component 5 includes a right connecting member 51. A third through hole 52 and a fourth through hole 54 are provided on one side of the slotted portion of the right connecting member 51, and a second threaded hole 53 and a third threaded hole 55 are provided on the other side.

[0018] Preferably, the diameters of the first through hole 42, the second through hole 44, the third through hole 52, and the fourth through hole 54 are different from the diameter of the tail hole of the cutter head 3.

[0019] Preferably, the first through hole 42, the second through hole 44, the third through hole 52, and the fourth through 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.

[0020] Preferably, there are three eccentric screws 6. Each of the three eccentric screws 6 includes a cylinder 61, an eccentric cylinder 62, a stud 63, and a cap 64. The cap 64, cylinder 61, eccentric cylinder 62, and stud 63 are connected in sequence. The diameter of cylinder 61 is larger than the diameter of eccentric cylinder 62. The centers of cylinder 61 and stud 63 are the same, and eccentric cylinder 62 is located at the eccentricity of cylinder 61 and stud 63.

[0021] Preferably, the first eccentric screw 6 passes sequentially through the first through hole 42, the tail hole of the cutting head 3, and the first threaded hole 43. The cylinder 61 of this eccentric screw 6 is movably installed in the first through hole 42, the eccentric cylinder 62 is located in the tail hole of the cutting head 3, and the stud 63 is threadedly connected to the first threaded hole 43. The second eccentric screw 6 passes sequentially through the third through hole 52, the tail hole of another cutting head 3, and the second threaded hole 53. The cylinder 61 of this eccentric screw 6 is movably installed in the third through hole 52, the eccentric cylinder 62 is movably installed in the tail hole of another cutting head 3, and the stud 63 is threadedly connected to the second threaded hole 53. The third eccentric screw 6 passes sequentially through the fourth through hole 54, the second through hole 44, and the third threaded hole 55. The cylinder 61 of this eccentric screw 6 is movably installed in the fourth through hole 54, the eccentric cylinder 62 is movably installed in the second through hole 44, and the stud 63 is threadedly connected to the third threaded hole 55. A nut is installed at the end of each stud 63.

[0022] The force analysis of the labor-saving effect of this utility model is as follows: Level 1 leverage: Taking the tail of the pliers 7 as the point of force application, and the eccentric screw 6 at the connection between the left connecting assembly 4 and the right connecting assembly 5 as the fulcrum (here, the third eccentric screw 6 is designated), and the two eccentric screws 6 at the connection between the left connecting assembly 4, the right connecting assembly 5, and the two cutter heads 3 as the output points (here, the first and second eccentric screws 6 are designated), let the applied force at the tail of the pliers 7 be F1, the distance from the point of force application at the tail of the pliers 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, pin 2 as the fulcrum, the applied force is F3, the distance from the first and second eccentric screws 6 to pin 2 is L3, the output force is F4, the distance from pin 2 to the tip of the cutter head 3 is 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 is 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.

[0023] The working principle of this utility model is as follows: After assembly, the center of the tail hole of the cutter head 3 is located at the eccentricity of the first through hole 42 and the third through hole 52, and the second through hole 44 is located at the eccentricity of the fourth through hole 54. When the shearing clamp is opened, under the eccentric action of the eccentric screw 6, the centers of the connection points of the cutter head 3, the left connecting component 4, and the right connecting component 5 are not in the same position. The centers of the first through hole 42 and the third through hole 52 are located outside the center of the tail hole of the cutter head 3. As the clamp handle 7 rotates, the clamp handle 7 can open to a larger angle. When the shearing clamp cuts the 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 clamp handle 7 rotates, the power arm gradually increases and the resistance arm gradually decreases. According to the torque calculation formula, the output force gradually increases, thus achieving the labor-saving effect of the shearing clamp.

[0024] 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 utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other. Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A labor-saving shearing clamp, comprising two pressure plates (1), wherein symmetrical pins (2) are disposed between the two pressure plates (1), and two blades (3) are rotatably mounted on the pressure plates (1) respectively via the two pins (2), wherein the pins (2) are located at the center of the blades (3), characterized in that, The tail ends of the two cutting heads (3) are respectively connected to a left connecting component (4) and a right connecting component (5) by an eccentric screw (6), and the left connecting component (4) and the right connecting component (5) are connected by an eccentric screw (6). The tail ends of the left connecting component (4) and the right connecting component (5) are fixedly connected to a plier handle (7).

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

3. The labor-saving shearing pliers according to claim 2, characterized in that, The right connecting component (5) includes a right connecting piece (51). The right connecting piece (51) has a third through hole (52) and a fourth through hole (54) on one side of the slotted part, 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 through hole (42), the second through hole (44), the third through hole (52), and the fourth through hole (54) are different from the diameter of the tail hole of the cutter head (3).

5. The labor-saving shearing pliers according to claim 3, characterized in that, The first through hole (42), the second through hole (44), the third through hole (52), and the fourth through 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 cylinder (61), an eccentric cylinder (62), a stud (63), and a cap (64). The cap (64), cylinder (61), eccentric cylinder (62), and stud (63) are connected in sequence. The diameter of the cylinder (61) is larger than the diameter of the eccentric cylinder (62). The cylinder (61) and the stud (63) have the same center. The eccentric cylinder (62) is located at the eccentricity of the cylinder (61) and the stud (63).

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

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