Crimping

Abstract

Crimping pliers, characterized in that it comprises a fixed handle (10), a movable handle (20) and a pliers head (30), the crimping pliers further comprising an adjustment assembly (40) for adjusting the size of the jaw of the pliers head (30), the adjustment assembly (40) comprising: an eccentric shaft (41) passing through both the movable handle (20) and the pliers head (30), the eccentric shaft (41) being capable of driving the pliers head (30) when rotated to rotate relative to the fixed handle (10); a knob (42) fixedly connected to a first end (411) of the eccentric shaft (41); a limiting assembly (43) installed at a second end (412) of the eccentric shaft (41); and a first return element (44), the first return element (44) being located between the button (42) and the movable handle (20); wherein the first return element (44) is fixed relative to the movable handle (20) when the first return element (44) is in a first compressed state; whereas, when the first return element (44) is compressed by the knob (42) and is in a second compressed state, the limit assembly (43) is separated from the movable handle (20) so that the eccentric shaft (41) can drive the pliers head (30) in rotation when rotated.

Description

TECHNICAL FIELD

[0001] The present utility model relates to the technical field of crimping tools, in particular a crimping pliers. STATE OF THE ART

[0002] Crimping tools are used to crimp the wire and terminal connection. Due to the relatively large number of wiring types and models, it is necessary to adapt to the use of the corresponding crimping pliers. Therefore, the problem of cumbersome carrying and loss of tools can easily occur. Currently, the torque adjustment mechanism is generally used to adjust the size of the jaw to adapt to different wiring sizes. The existing torque adjustment mechanism is fixed with screws and requires additional tools to disassemble the screws before adjustment. At the same time, tools are required for secondary fastening after the adjustment process is completed, resulting in cumbersome adjustment problems. CONTENT OF THE PRESENT UTILITY MODEL

[0003] Here is the revised version without reference numbers and brackets, while retaining all technical terms and sentence structures: In order to overcome the deficiencies in the prior art, the purpose of the present utility model is to provide a crimping pliers that can improve the ease of adjustment.

[0004] To solve the above-mentioned problems, this utility model uses the following technical solution: a crimping pliers comprising a fixed handle, a movable handle and a pliers head, the crimping pliers further comprising an adjustment assembly for adjusting the size of the jaw of the pliers head, the adjustment assembly comprising: an eccentric shaft passing through both the movable handle and the pliers head, the eccentric shaft being capable of rotating the pliers head to rotate relative to the fixed handle; a knob fixedly connected to a first end of the eccentric shaft; a limit assembly installed at a second end of the eccentric shaft; and a first return element, the first return element being located between the knob and the movable handle; wherein the first return element is fixed relative to the movable handle when the first return element is in a first compressed state; while when the first return element is compressed by the knob and is in a second compressed state, the limit assembly is separated from the movable handle so that the eccentric shaft, when rotated, can drive the pliers head in rotation.

[0005] Furthermore, it is intended that the limiting assembly comprises the following: a limit seat attached to the second end; a limiting projection provided on an end surface of the limiting seat or the movable handle; wherein the limiting seat or the movable handle is provided with a limiting hole into which the limiting projection can be embedded, so that the limiting projection is embedded in the limiting hole when the first return member is in a first compressed state.

[0006] Furthermore, it is provided that the limiting projections are provided in a circumferential direction along a rotational axis of the eccentric shaft and in a number of at least two, wherein the limiting holes are provided one-to-one corresponding to the limiting projections.

[0007] Furthermore, it is provided that the first return element is a spring, wherein both ends of the spring respectively bear against the button and the movable handle; wherein a movable gap is formed between the button and the one movable handle when the spring is in a first compressed state.

[0008] Furthermore, it is provided that an anti-slip pattern is provided on a peripheral side of the button.

[0009] Furthermore, it is provided that the pliers head is provided with a mounting hole on one end near the movable handle, and that the adjustment assembly further comprises an eccentric wheel which is fastened within the mounting hole, wherein the eccentric wheel is provided with a connecting hole with a flat tip, wherein the eccentric shaft presses against the connecting hole and through which the connecting hole passes.

[0010] Furthermore, it is provided that the crimping tool further comprises a trigger assembly, wherein the trigger assembly comprises the following: a transmission portion provided with a third end and a fourth end, the third end being rotatably connected within the fixed handle, while the fourth end is rotatably connected within the movable handle, the third end being provided with a plurality of consecutive tooth grooves; a release toggle lever provided with a fifth end and a sixth end, the fifth end being rotatably connected within the movable handle while the sixth end is exposed on an outer side of the movable handle, the fifth end being provided with snap teeth engageable with the tooth grooves; a second return element connected at one end within the movable handle and at another end to the fifth end for returning the release toggle lever when the movable handle and the fixed handle are pressed together to an extreme position.

[0011] Furthermore, it is provided that the unlocking knee lever is inclined upwards in a direction away from the fixed handle.

[0012] Furthermore, it is provided that the movable handle is fixedly connected to a positioning rod on an inner side, and that the transmission section is provided with a positioning sliding groove on which the positioning rod can slide, wherein a circular axis of the positioning sliding groove coincides with the rotational axis of the transmission section on the movable handle.

[0013] Furthermore, it is provided that a side surface of the fourth end is rounded, wherein the fixed handle is fixedly connected to a connecting seat in the interior, wherein a limiting groove passes through one side of the connecting seat, into which at least a part of the fourth end can be embedded.

[0014] Compared to the prior art, the advantageous effect of this utility model is that: In the present application, through the cooperation of the eccentric shaft, the knob, the limit assembly, the first return member, and the pliers head, the limit assembly can be separated from the movable handle by pressing the knob, so that the knob can be rotated to drive the eccentric shaft to rotate, and thus the size of the jaw can be adjusted larger or smaller without additional tools, thereby facilitating the adjustment of the crimping pliers. SHORT DESCRIPTION OF THE DRAWING Fig. 1 shows a schematic diagram of the structure of a crimping pliers according to an embodiment of the present utility model; Fig. 2 shows a first schematic exploded view of the partial structure of the crimping pliers according to an embodiment of the present utility model; Fig. 3 shows a first schematic representation of the partial structure of the crimping pliers according to an embodiment of the present utility model; Fig. 4 shows a second schematic exploded view of the partial structure of the crimping pliers according to an embodiment of the present utility model; Fig. 5 shows a third schematic exploded view of the partial structure of the crimping pliers according to an embodiment of the present utility model; Fig. Figure 6 shows an enlarged view of A in Fig. 4; Fig. 7 shows a second schematic representation of the partial structure of the crimping pliers according to an embodiment of the present utility model; Fig. 8 shows a third schematic representation of the partial structure of the crimping pliers according to an embodiment of the present utility model; List of reference symbols:

[0015] 10. Fixed handle; 101. Connecting seat; 102. Limit groove; 20. Movable handle; 201. Limit hole; 30. Pliers head; 31. Adjusting body; 310. Mounting hole; 311. Receiving through hole; 3110. Snap groove; 32. Pliers teeth; 321. First end surface; 3211. First plane; 3212. Concave surface; 3213. Convex surface; 3221. Second plane; 3222. Third plane; 3223. Fourth plane; 33. Third return element; 34. First connecting shaft; 40. Adjusting assembly; 41. Eccentric shaft; 411. First end; 412. Second end; 42. Knob; 421. Anti-slip pattern; 43. Limit assembly; 431. First connecting portion; 432. Limit seat; 430. Limit projection; 44. First return element; 45. Eccentric wheel; 450. Connecting hole; 46. Second connecting portion; 47. Protective cap; 5. Trigger assembly; 50. Transmission portion; 501. Third end; 502. Fourth end; 51. Tooth groove; 510. Second connecting shaft; 60. Unlocking toggle lever; 601. Fifth end; 602. Sixth end; 603. Third connecting shaft; 61.Snap teeth; 70. Second return element; 701. Fourth connecting shaft; 8. Positioning rod; 801. Positioning slide groove; 90. Anti-slip sleeve. DETAILED DESCRIPTION

[0016] Here, the technical solutions of the embodiments of the present utility model are described clearly and completely in conjunction with the drawings of the present utility model. It is understood that the described embodiments represent only a portion of the embodiments of the present utility model and not all embodiments. Based on the embodiments of the present utility model, all other embodiments that can be devised by those skilled in the art without creative effort fall within the scope of the present utility model.

[0017] The terms "first," "second," etc., in the description and claims of the present utility model, as well as in the above-mentioned drawings, are used to distinguish between different objects and not to describe a particular order. Furthermore, the terms "comprise" and "have," and any variations thereof, are intended to cover non-exclusive inclusions. It should be noted that when an element is described as being "attached to another element," it may be directly on top of the other element, or an intermediary element may be present. When an element is described as being "connected to another element," it may be directly connected to the other element, or an intermediary element may be present. When an element is described as being "arranged on another element," it may be arranged on top of the other element, or an intermediary element may be present.

[0018] As in Fig. 1 to 8, an embodiment of the present utility model provides a crimping pliers, the crimping pliers comprising a fixed handle 10, a movable handle 20, a pliers head 30 and an adjustment assembly 40. The fixed handle 10 and the movable handle 20 are provided in opposite directions, one end of the pliers head 30 is rotatably connected to the fixed handle 10, and the other end of the pliers head 30 is provided inside the movable handle 20. As shown in Fig. 2, both the fixed handle 10 and the movable handle 20 are wrapped with an anti-slip sleeve 90, which is comfortable for the user to hold.

[0019] As in Fig. 4 and Fig. 5, in particular, the adjustment assembly 40 includes an eccentric shaft 41, a knob 42, a limit assembly 43, and a first return element 44. The eccentric shaft 41 passes through both the movable handle 20 and the pliers head 30. The eccentric shaft 41 is rotatably connected to the movable handle 20, and the eccentric shaft 41 is snapped into the pliers head 30. When rotated, the eccentric shaft 41 can drive the pliers head 30 to rotate relative to the fixed handle 10. Specifically, the jaw becomes larger when the eccentric shaft 41 is rotated in a predetermined direction, and the jaw becomes smaller when the eccentric shaft 41 is rotated in the opposite direction. In other words, the crimping pliers of the present utility model can be adapted to wires of different sizes.

[0020] The knob 42 is fixedly connected to a first end 411 of the eccentric shaft 41, while the limit assembly 43 is installed at a second end 412 of the eccentric shaft 41, i.e., the knob 42 and the limit assembly 43 are located on opposite sides of the movable handle 20, respectively. The first return element 44 is located between the knob 42 and the movable handle 20. In this embodiment, the first return element 44 abuts the knob 42 and the movable handle 20. In particular, the eccentric shaft 41 passes through the first return element 44.

[0021] As in Fig. 4, Fig. 5 and Fig. 6, for example, the first return element 44 can be either a spring or an elastic cylinder. When the spring is in a first compressed state, a movable gap is formed between the knob 42 and the movable handle 20. The movable gap is the stroke by which the knob 42 can be pressed downward.

[0022] When the first return element 44 is in the first compressed state, the limit assembly 43 is fixed relative to the movable handle 20. When the first return element 44 is compressed by the knob 42 and is in a second compressed state, the limit assembly 43 is separated from the movable handle 20, so that the eccentric shaft 41, when rotated, can drive the pliers head 30 in rotation at this time.

[0023] That is, during a specific operation, the knob 42 can be pushed in a direction close to the movable handle 20, and the first return element 44 is compressed to unlock the fastening relationship between the limit assembly 43 and the movable handle 20. Then, the knob 42 is rotated in the predetermined direction as needed to rotate the eccentric shaft 41, which the pliers head 30 can drive in rotation, thus achieving the adjustment of the jaw to a predetermined size. When the knob 42 is released after adjustment, the first return element 44 is reset to drive the limit assembly 43 and restore the relative fastening relationship between the movable handle 20 and the limit assembly 43.At this time, the movable handle 20 can be pressed close to the fixed handle 10, and the movable handle 20 drives the pliers head 30 to rotate, thereby reducing the size of the jaw to complete the wire crimping.

[0024] In the present utility model, through the cooperation of the eccentric shaft 41, the knob 42, the limit assembly 43, the first return member 44, and the pliers head 30, the limit assembly 43 can be separated from the movable handle 20 by pressing the knob 42, so that the eccentric shaft 41 can be rotated to drive the pliers head 30 to rotate, and thus the size of the jaw can be adjusted larger or smaller to adapt to crimping wires of different diameters. By designing the structure of the adjustment assembly 40, the present utility model makes it possible to adjust the size of the jaw by pressing and turning the knob 42 without additional tools, thereby facilitating the adjustment of the crimping pliers.

[0025] In some embodiments, as in Fig. 3, Fig. 5 and Fig. 6, the limiting assembly 43 includes a limiting seat 432 and a limiting projection 430, the limiting seat 432 being fixed to the second end 412 by the first connecting portion 431, the limiting projection 430 being provided on an end surface of the limiting seat 432 or the movable handle 20, the limiting seat 432 or the movable handle 20 being provided with a limiting hole 201 into which the limiting projection 430 can be embedded, so that the limiting projection 430 is embedded in the limiting hole 201.

[0026] In this embodiment, the limiting projection 430 is integrally formed on the end surface of the limiting seat 432 in a direction facing the movable handle 20, and the movable handle 20 is provided with a limiting hole 201 into which the limiting projection 430 can be embedded, so that the limiting projection 430 is embedded in the limiting hole 201 when the first return member 44 is in a first compressed state to realize relative fastening between the movable handle 20 and the limiting seat 432.

[0027] In some embodiments, the limiting protrusion 430 is provided on the limiting seat 432, and the limiting hole 201 is provided on the movable handle 20. The number of the limiting protrusion 430 and the limiting hole 201 is at least two, and the limiting protrusions 430 are provided in a circumferential direction along a rotation axis of the eccentric shaft 41. In this embodiment, the number of the limiting protrusion 430 and the limiting hole 201 is two, and the limiting holes 201 are provided in a one-to-one correspondence with the limiting protrusions 430. The position of the limiting hole 201 and the limiting protrusion 430 is provided so that the strength can be ensured in a small size range and the problem of opening and cracking does not easily arise.

[0028] As in Fig. 5 and Fig. 6, in some embodiments, the pliers head 30 is provided with a mounting hole 310 on one end near the movable handle 20, and the adjustment assembly 40 further includes an eccentric wheel 45. The eccentric wheel 45 is fixed within the mounting hole 310 and is provided with a connecting hole 450 with a flat tip, with the eccentric shaft 41 pressing against the connecting hole 450 and passing through the connecting hole 450. Supporting the eccentric shaft 41 by the eccentric wheel 45 facilitates the replacement of components according to rotational wear, and the structure of the eccentric wheel 45 is simple and smaller in size, which facilitates cost reduction.

[0029] As in Fig. 6, in some embodiments, the knob 42 is provided on one side with a plurality of anti-slip patterns 421 arranged in a circumferential array, thereby enabling increased friction and reducing rotational slippage.

[0030] As in Fig. 5 and Fig. 6, in some embodiments, the first connecting portion 431 is screwed to the eccentric shaft 41, i.e., a threaded bore may be formed on a top side of the eccentric shaft 41, thereby enabling the screwing of the first connecting portion 431. The adjustment assembly 40 further comprises a second connecting portion 46 and a protective cap 47, wherein the second connecting portion 46 passes through the knob 42 to be screwed to one end of the eccentric shaft 41 adjacent to the first return element 44, and the second connecting portion 46 is further screwed to the knob 42, thereby realizing a fixed connection between the knob 42 and the eccentric shaft 41.

[0031] The protective cap 47 is attached to the end of the knob 42 facing away from the first return element 44 by screwing or snapping. In this embodiment, a mounting groove is provided on the end of the knob 42 facing away from the first return element 44, and the protective cap 47 is attached to the mounting groove to create a snap-in connection between the two. Connecting the limiting assembly 43 and the knob 42 by screwing the connecting portion is convenient for disassembly and assembly, and the protective cap 47 also facilitates improved protection of the second connecting portion 46.

[0032] As in Fig. 8, in some embodiments, the pliers head 30 includes an adjusting body 31, pliers teeth 32 and a third return element 33, the pliers teeth 32 are provided in plurality, with six pliers teeth 32 being shown in FIG., and the crimping pliers further include a plurality of first connecting shafts 34. The eccentric shaft 41 passes through the adjusting body 31, an end of the adjusting body 31 facing away from the eccentric shaft 41 is provided inside the fixed handle 10 and is provided with a receiving through-hole 311, and the receiving through-hole 311 is provided on the inner surface with a plurality of annularly arranged snap grooves 3110, six of which are shown in FIG.One end of each pincer tooth 32 is provided in one of the snap grooves 3110. Viewed along an arrangement direction of the plurality of snap grooves 3110, the pincer tooth 32 includes a first end surface 321 and a second end surface 322 that are opposite to each other. The first end surface 321 is provided, at a part facing away from the snap groove 3110, with a first plane 3211 that is inclined toward the second end surface 322, and the second end surface 322 includes a second plane 3221, a third plane 3222, and a fourth plane 3223 that are arranged sequentially. The third plane 3222 is provided at an obtuse angle to the second plane 3221 and the fourth plane 3223, and the obtuse angle is provided relative to the first plane 3211, and the fourth plane 3223 is adjacent to the first plane 3211.When the jaw size is adjusted, the fourth plane 3223 slides along the first plane 3211 adjacent to the pliers teeth 32, and each of the first connecting shafts 34 passes along a direction perpendicular to the tangent of the receiving through hole 311 through one of the pliers teeth 32 and is provided inside the fixed handle 10.

[0033] For example, two opposing mounting holes can be provided within the fixed handle 10 so that the output end of the first connecting shaft 34 can be secured in the mounting holes to be mounted in the fixed handle 10, and the pliers teeth 32 can rotate around the first connecting shaft 34. The annularly arranged pliers teeth 32 enable multidirectional crimping force, thereby achieving high stability for crimping the wires. The design of the pliers teeth 32 allows for an increase in the number of arrangements of the pliers teeth 32 and an increase in the stability of the jaw adjustment.

[0034] In this embodiment, the third return element 33 is a tension spring, and one end of the third return element 33 is fixed to the adjustment body 31 adjacent to the position of the adjustment assembly 40, and the other end is fixed to the upper end of the fixed handle 10 to maintain the pliers head 30 in an open state. In other words, when the movable handle 20 and the fixed handle 10 are in a press-fit state, the third return element 33 is in a tensioned state, and when released, the third return element 33 urges the lower end of the adjustment body 31 in a direction toward the fixed handle 10.

[0035] In a certain operation, the adjusting body 31 rotates to drive the pincer teeth 32 to rotate about the first connecting shaft 34, and the fourth plane 3223 slides along the first plane 3211 of the adjacent pincer tooth 32 in a direction away from the snap groove 3110 so that the jaw becomes smaller, and vice versa so that the jaw becomes larger.

[0036] In some embodiments, the first end surface 321 further includes, as viewed along a direction facing the snap groove 3110, a concave surface 3212, a convex surface 3213, a concave surface 3212, and a convex surface 3213 arranged sequentially. A convex surface 3213 located at one end portion is provided within the snap groove 3110, the first connecting shaft 34 is located on one side of the other convex surface 3213, and the projections of the concave surface 3212 and the convex surface 3213 are located on the second plane 3221. The structure of the pincer tooth 32 facilitates ensuring strength while maximizing the rotation angle of the pincer tooth 32, thereby also facilitating the expansion of the adjustment range of the pincer tooth.

[0037] In another embodiment, the pliers head 30 may be pivotally connected to the fixed handle 10 such that the pliers head 30 and the fixed handle 10 open and close relative to each other to adjust the size of the jaw.

[0038] In some embodiments, as in Fig. 2, the crimping pliers further comprise a transmission section 50, a release lever 60, and a second return element 70. The transmission section 50 is provided on one side of the pliers head 30 near the eccentric shaft 41. The transmission section 50 is provided with a third end 501 and a fourth end 502, the third end 501 being rotatably connected within the fixed handle 10, while the fourth end 502 is rotatably connected within the movable handle 20, the third end 501 being provided with a plurality of consecutive tooth grooves 51. Specifically, the number of tooth grooves 51 is three.

[0039] The release toggle lever 60 is provided with a fifth end 601 and a sixth end 602, the fifth end 601 being rotatably connected within the movable handle 20, while the sixth end 602 is exposed on an outer side of the movable handle 20, the fifth end 601 being provided with snap teeth 61 that can engage with the tooth grooves 51;

[0040] The second return element 70 is a tension spring, the spring is rotatably connected at one end within the movable handle 20 and at another end to the fifth end 601 to return the release toggle lever 60 when the movable handle 20 and the fixed handle 10 are pressed together to an extreme position.

[0041] The release toggle lever 60 is provided so as to be inclined upward in a direction away from the fixed handle 10. In some other embodiments, the release toggle lever 60 may also be provided so as to be inclined downward in a direction away from the fixed handle 10 to facilitate the user's one-handed flip of the release toggle lever 60.

[0042] When the user needs to crimp the terminal, the movable handle 20 and the fixed handle 10 are manipulated to pivot close to each other, the third end 501 and the fixed handle 10 rotate relative to each other, causing the fourth end 502 to rotate clockwise around the third end 501, and the snap teeth 61 to engage with the tooth grooves 51 and move. At this time, the jaws of the pliers head 30 are gradually reduced to complete the crimping operation on the terminal. If the user wishes to crimp the next terminal after the crimping operation is completed, there are two methods for releasing the crimping state: Method 1: Further pressing the movable handle 20 and the fixed handle 10 together so that the snap teeth 61 are disengaged from the tooth grooves 51, and then by the elasticity of the second return member 70, the unlocking toggle lever is returned, thereby achieving the opening of the movable handle 20 and the fixed handle 10. Method 2: The user tilts the external sixth end 602 so that the snap teeth 61 are disengaged from the tooth grooves 51, and then by the elasticity of the second return member 70, the unlocking toggle lever 60 is returned, thereby achieving the opening of the movable handle 20 and the fixed handle 10.

[0043] By the two methods of the present utility model, the user can quickly open the movable handle 20 relative to the fixed handle 10 to continuously operate the crimping.

[0044] It should also be emphasized that the distance between the movable handle 20 and the fixed handle 10 is very small, and the existing unlocking toggle lever 60 is usually provided between the movable handle 20 and the fixed handle 10. When the pliers head 30 is jammed, that is, when the crimping product has an incorrect model or specification, causing the movable handle 20 and the fixed handle 10 to jam, it is necessary to use an external tool to achieve the unlocking of the tooth grooves 51 and the snap teeth 61.

[0045] In contrast, the sixth end 602 of the release toggle lever 60 of the present utility model is exposed on the outside of the movable handle 20, ie the sixth end 602 is exposed in a direction away from the fixed handle 10.

[0046] In some embodiments, the movable handle 20 is fixedly connected to a positioning rod 8 on an inner side, and the transmission portion 50 is provided with a positioning sliding groove 801 on which the positioning rod 8 can slide, wherein a circular axis of the positioning sliding groove 801 coincides with the rotation axis of the transmission portion 50 on the movable handle 20.

[0047] In this embodiment, a side surface of the fourth end 502 is rounded so that the user can easily tilt the fourth end 502, the fixed handle 10 being fixedly connected internally to a connecting seat 101, a limiting groove 102 passing through one side of the connecting seat 101, into which at least a part of the fourth end (502) can be embedded to limit the fourth end 502.

[0048] The crimping pliers further comprise a second connecting shaft 510, a third connecting shaft 603, and a fourth connecting shaft 701. The second connecting shaft 510, the third connecting shaft 603, and the fourth connecting shaft 701 are mounted within the movable handle 20, the second connecting shaft 510 passes through one end of the transmission section provided with the tooth groove, the third connecting shaft 510 passes through the unlocking toggle lever 60, and the fourth connecting shaft 701 passes through an end of the second return element facing away from the unlocking toggle lever 60.

[0049] For example, the movable handle 20 may be provided with two opposing mounting through holes at each of the positions corresponding to the second connecting shaft 510, the third connecting shaft 603, and the fourth connecting shaft 701 for mounting the corresponding connecting shafts to the movable handle 20. The mounting through hole for mounting the third connecting shaft 603 has a larger diameter than the diameter of the third connecting shaft 603, that is, the third connecting shaft 603 has a movable gap with its corresponding mounting through hole. Assembling the transmission portion 50, the unlocking toggle lever 60, and the second return element 70 by means of the connecting shaft and the limiting groove 102 facilitates the simplification of the structure of the device.

[0050] The embodiments described above are only the preferred embodiments of the utility model and should not be used to limit the scope of protection of this utility model. All non-essential modifications and substitutions made by those skilled in the art based on this utility model fall within the scope of protection of the present utility model.

Claims

[1] Crimping pliers, characterized by in that it comprises a fixed handle (10), a movable handle (20) and a pliers head (30), wherein the crimping pliers further comprise an adjustment assembly (40) for adjusting the size of the jaw of the pliers head (30), wherein the adjustment assembly (40) comprises: an eccentric shaft (41) passing through both the movable handle (20) and the pliers head (30), the eccentric shaft (41) being capable of driving the pliers head (30) when rotated to rotate relative to the fixed handle (10); a knob (42) fixedly connected to a first end (411) of the eccentric shaft (41); a limiting assembly (43) installed at a second end (412) of the eccentric shaft (41); and a first return element (44), the first return element (44) being located between the button (42) and the movable handle (20); wherein the first return element (44) is fixed relative to the movable handle (20) when the first return element (44) is in a first compressed state; whereas, when the first return element (44) is compressed by the knob (42) and is in a second compressed state, the limit assembly (43) is separated from the movable handle (20) so that the eccentric shaft (41) can drive the pliers head (30) in rotation when rotated. [2] Crimping pliers according to claim 1, characterized by that the limiting assembly (43) comprises: a limiting seat (432) attached to the second end (412); a limiting projection (430) provided on an end surface of the limiting seat (432) or the movable handle (20); wherein the limiting seat (432) or the movable handle (20) is provided with a limiting hole (201) into which the limiting projection (430) can be embedded, so that the limiting projection (430) is embedded in the limiting hole (201) when the first return element (44) is in a first compressed state. [3] Crimping pliers according to claim 2, characterized by that the limiting projections (430) are provided in a circumferential direction along a rotational axis of the eccentric shaft (41) and in a number of at least two, wherein the limiting holes (201) are provided one-to-one corresponding to the limiting projections (430). [4] Crimping pliers according to claim 2, characterized byin that the first return element (44) is a spring, both ends of the spring abutting against the knob (42) and the movable handle (20), respectively; a movable gap being formed between the knob (42) and the one movable handle (20) when the spring is in a first compressed state. [5] Crimping pliers according to claim 2, characterized by that an anti-slip pattern (421) is provided on a peripheral side of the button (42). [6] Crimping pliers according to claim 2, characterized bythat the pliers head (30) is provided with a mounting hole (310) on one end near the movable handle (20), and that the adjustment assembly (40) further comprises an eccentric wheel (45) which is fixed within the mounting hole (310), the eccentric wheel (45) being provided with a connecting hole (450) with a flat tip, the eccentric shaft (41) pressing against the connecting hole (450) and through which the connecting hole (450) passes. [7] Crimping pliers according to claim 6, characterized by that the crimping pliers further comprise a trigger assembly (5), wherein the trigger assembly (5) comprises: a transmission section (50) provided with a third end (501) and a fourth end (502), the third end (501) being rotatably connected within the fixed handle (10), while the fourth end (502) is rotatably connected within the movable handle (20), the third end (501) being provided with a plurality of successive tooth grooves (51); an unlocking toggle lever (60) provided with a fifth end (601) and a sixth end (602), the fifth end (601) being rotatably connected within the movable handle (20) while the sixth end (602) is exposed on an outer side of the movable handle (20), the fifth end (601) being provided with snap teeth (61) which can engage with the tooth grooves (51); a second return element (70) connected at one end within the movable handle (20) and at another end to the fifth end (601) for returning the release toggle lever (60) when the movable handle (20) and the fixed handle (10) are pressed together to an extreme position. [8] Crimping pliers according to claim 7, characterized by that the unlocking knee lever (60) is inclined upwards in a direction away from the fixed handle (10). [9] Crimping pliers according to claim 7, characterized by that the movable handle (20) is fixedly connected on an inner side to a positioning rod (8), and that the transmission section (50) is provided with a positioning sliding groove (801) on which the positioning rod (8) can slide, wherein a circular axis of the positioning sliding groove (801) coincides with the axis of rotation of the transmission section (50) on the movable handle (20). [10] Crimping pliers according to claim 7, characterized by that a side surface of the fourth end (502) is rounded, wherein the fixed handle (10) is fixedly connected internally to a connecting seat (101), wherein a limiting groove (102) passes through one side of the connecting seat (101), into which at least a part of the fourth end (502) can be embedded.

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