Mechanical stroke control dieless hexagonal crimping pliers and operation system thereof

Abstract

This utility model discloses a mechanically controlled, mold-change-free hexagonal crimping pliers and its operating system, belonging to the field of hydraulic tool technology. The crimping pliers mainly consist of a fixed crimping die assembly, a movable crimping die assembly, a crimping size adjustment assembly, and an overall connecting assembly. Through the piston rod and its precision threads in the crimping size adjustment assembly, in conjunction with the interlocking first and second knurled adjusting nuts, an adjustable mechanical limit structure is formed. The extension length of the piston rod can be precisely controlled by manually rotating the nuts and setting the scale, thereby steplessly adjusting the crimping stroke of the movable crimping die assembly. This achieves precise control of the hexagonal crimping size for different specifications of wires and terminals, completely eliminating the need for mold changes. The slider crimping die blades in the fixed and movable crimping die assemblies slide synchronously through a 120° contact angle design and are automatically reset by a spring. This utility model features a compact structure, simple and quick adjustment, no calibration required, and a stable and reliable crimping process.

Description

Technical Field

[0001] This utility model relates to the field of power tools and hydraulic transmission control technology, and in particular to a mechanical stroke control hexagonal crimping pliers and its working system that does not require mold replacement. It is a mechanical stroke control system that does not require mold replacement and is suitable for various specifications of wires and terminals. It is especially suitable for high-precision crimping operations of multi-strand wires, non-standard connectors and connectors with different gaps. Background Technology

[0002] Hexagonal crimping pliers, as a key piece of equipment for standard part forming, are widely used in fasteners, automotive parts, and other fields. During the construction of power cable terminals and equipment connections, traditional crimping tools generally suffer from problems such as fixed crimping specifications, frequent mold changes, and complex adjustments. Especially when dealing with various wire types (such as multi-strand conductors, branched wires, and non-standard connectors), changing molds not only affects work efficiency but also poses certain safety hazards.

[0003] Although some crimping equipment currently uses hydraulic drive, it still mainly relies on fixed molds, which makes it impossible to achieve precise control over the crimping dimensions. As a result, the crimping effect is unstable and there are potential quality problems such as flash, deformation, and poor contact.

[0004] This utility model provides a crimping clamp structure that adjusts the hexagonal crimping size through mechanical stroke control, eliminating the need to change the mold. It is compatible with copper and aluminum terminals of different materials and specifications, and boasts advantages such as stepless pressure adjustment, automatic pressure stop, and safe reset. It is particularly suitable for 700bar standard hydraulic sources, including electric pumps, foot pumps, and PLC-controlled pumps, enabling efficient, safe, and repeatable crimping operations, significantly improving the flexibility and consistency of on-site operations. Currently, traditional hexagonal crimping mechanisms still have some technical bottlenecks, such as: (1) Poor mobility and inability to cope with multiple usage scenarios: Existing fixed pressing mechanisms are often fixedly installed in pressing factories or processing centers. The weight and volume of the whole machine are large, and forklifts are required for handling.

[0005] (2) The existing hexagonal pressing mechanism requires the replacement of the hexagonal mold when it is needed to process hexagonal pressing tasks of different sizes. This is not easy to operate, time-consuming and labor-intensive, and it cannot handle some non-standard size pressing tasks.

[0006] (3) Reliance on adjustment and calibration, and time-consuming calibration operation: Although the existing hydraulic adjustable hexagonal die-pressing mechanism can achieve high-precision positioning, each die change requires a depressurization-calibration-pressurization process, which is relatively time-consuming.

[0007] (4) Relying on electrical signal feedback, it is not stable enough and has a limited lifespan: The existing electric control hexagonal pressing mechanism relies on the feedback of the travel limit switch signal. It has poor stability under external interference, and the limit switch is prone to breakage when subjected to high-frequency mechanical vibration, resulting in a limited lifespan. Utility Model Content

[0008] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a mechanical stroke-controlled, mold-free hexagonal crimping pliers and its operating system. This is a more portable, multi-scenario applicable, mold-free, and rapidly and infinitely precise mechanical hexagonal crimping mechanism that allows for stepless adjustment of processing dimensions.

[0009] The above-mentioned utility model objective is achieved through the following technical solution: A mechanical stroke-controlled, mold-change-free hexagonal crimping pliers includes a main body and a fixed crimping mold assembly, a movable crimping mold assembly, a crimping size adjustment assembly, and an overall connection assembly mounted on the main body. The fixed molding assembly includes a fixed molding die, a first fixed slider molding die, a second fixed slider molding die, a first fixed slider spring, and a second fixed slider spring. The first fixed slider molding die and the second fixed slider molding die slide together via a 120° contact angle. The first fixed slider molding die is reset by the first fixed slider spring, and the second fixed slider molding die is reset by the second fixed slider spring. The movable molding assembly includes a movable molding die, a first movable slider molding die, a second movable slider molding die, a first movable slider spring, and a second movable slider spring. The first movable slider molding die and the second movable slider molding die slide together via a 120° contact angle. The first movable slider molding die is reset by the first movable slider spring, and the second movable slider molding die is reset by the second movable slider spring. The pressing size adjustment assembly includes a guide connector, a piston rod, a first knurled adjusting nut, a second knurled adjusting nut, a cylinder body connector, and a scale. One side of the piston rod is fixedly connected to the movable pressing mold assembly, and the other side is movably connected to the cylinder body connector. The first knurled adjusting nut and the second knurled adjusting nut are connected to the piston rod through internal threads, and the two interlock to form an adjustable mechanical limiting structure. The overall connecting assembly includes an outer connecting plate, a front fastener, and a rear fastener. The outer connecting plate is fixedly connected to the fixed die-cutting tool through the front fastener and fixedly connected to the guide connector through the rear fastener.

[0010] As a further technical solution of this utility model: the fixed pressing die is fixedly installed on the main body, and a first sliding groove is provided on the fixed pressing die. A first slider is provided below the first fixed slider pressing die and the second fixed slider pressing die. The first slider slides in cooperation with the first sliding groove, so that the lower handle of the first fixed slider pressing die and the second fixed slider pressing die can slide synchronously when pressed.

[0011] As a further technical solution of this utility model: the first fixed slider spring is installed between the first fixed slider pressing die and the fixed pressing die, and is used to provide reverse support force to the first fixed slider pressing die during the pressing process, and to reset the first fixed slider pressing die after the pressing is completed; The second fixed slider spring is installed between the second fixed slider pressing die and the fixed pressing die, and is used to provide reverse support force to the second fixed slider pressing die during the pressing process, and to reset the second fixed slider pressing die after the pressing is completed.

[0012] As a further technical solution of this utility model: the movable pressing die is fixedly installed on the main body, and a second sliding groove is provided on the movable pressing die. A second slider is provided below the first movable slider pressing die and the second movable slider pressing die. The second slider slides in cooperation with the second sliding groove, so that the lower handle of the first movable slider pressing die and the second movable slider pressing die can slide synchronously when pressed.

[0013] As a further technical solution of this utility model: the first movable slider spring is installed between the first movable slider pressing die and the movable pressing die, and is used to provide reverse support force to the first movable slider pressing die during the pressing process, and to reset the first movable slider pressing die after the pressing is completed; The second movable slider spring is installed between the second movable slider pressing die and the movable pressing die, and is used to provide reverse support force to the second movable slider pressing die during the pressing process, and to reset the second movable slider pressing die after the pressing is completed.

[0014] As a further technical solution of this utility model: the guide connector is fixedly connected to the cylinder connector, the piston rod can make a relatively linear feed motion, driven by the pressure or thrust transmitted inside the cylinder connector and transmits power to the moving mold assembly to complete the pressing motion, and the piston rod is provided with an external thread that meshes with the internal threads of the first knurled adjusting nut and the second knurled adjusting nut. The positions of the first knurled adjusting nut and the second knurled adjusting nut can be adjusted by threads. When the first knurled adjusting nut and the second knurled adjusting nut are pressed together, they interlock through contact pressure and together form a stable mechanical limiting structure to control the extension length of the piston rod, thereby controlling the pressing stroke of the moving pressing die assembly and thus controlling the pressing size of the hexagonal pressing die.

[0015] As a further technical solution of this utility model: the outer sides of the first knurled adjusting nut and the second knurled adjusting nut are provided with knurling to increase the contact area and friction. The position of the nut can be adjusted by hand or clamping device through the knurling.

[0016] As a further technical solution of this utility model: the scale is used to intuitively show the current adjustment position during the adjustment process. By having the upper scale of the scale correspond to the upper groove of the first knurled adjusting nut, the target stroke can be quickly adjusted.

[0017] An operating system includes the aforementioned mechanical stroke-controlled, mold-change-free hexagonal crimping clamp, and also includes a hydraulic drive source, said hydraulic drive source being a 700-bar standard electric pump, foot pump, or PLC-controlled electric pump.

[0018] In summary, this utility model has at least one of the following beneficial technical effects: 1. This utility model discloses a mechanical stroke-controlled, mold-change-free hexagonal crimping pliers and its operating system, belonging to the field of hydraulic tool technology. The crimping pliers mainly consist of a fixed crimping die assembly, a movable crimping die assembly, a crimping size adjustment assembly, and an overall connecting assembly. Its core innovation lies in: through the piston rod and its precision threaded surface in the crimping size adjustment assembly, combined with the interlocking first and second knurled adjusting nuts, an adjustable mechanical limit structure is formed. Manually rotating the nuts and setting according to the scale allows for precise control of the piston rod's extension length, thereby steplessly adjusting the crimping stroke of the movable crimping die assembly. This achieves precise control of the hexagonal crimping size for different specifications of wires and terminals, completely eliminating the need for mold changes. The slider crimping die blades in the fixed and movable crimping die assemblies achieve synchronous sliding through a 120° contact angle design and are automatically reset by a spring. This utility model features a compact structure, simple and quick adjustment, no calibration required, stable and reliable crimping process, strong anti-interference capability, and long service life. It is suitable for various operating scenarios, significantly improving crimping efficiency and quality consistency. The operating system also includes a compatible 700bar standard hydraulic drive source.

[0019] 2. This utility model occupies a small overall space, has a simple and lightweight structure, requires no complicated circuit control system, and has good portability, making it suitable for various scenarios such as outdoor processing and on-site maintenance. This utility model does not require mold replacement during use; the pressing size is infinitely adjustable by adjusting the pressure stroke, effectively meeting the processing needs of non-standard sizes in special industries.

[0020] 3. This invention features a simple adjustment method that requires no calibration. The crimping size can be quickly adjusted by manually rotating the knurled nut to align with the scale, resulting in high efficiency. The crimping stroke of this invention is entirely controlled by a mechanical structure, making it less susceptible to external environmental influences and interference, ensuring a long service life and stable crimping process.

[0021] 4. This utility model adopts a modular design concept, dividing the pressing die and adjustment mechanism into separate modules, which facilitates subsequent maintenance and repair, and effectively reduces maintenance costs. This utility model has wide applications; the pressing power can be transmitted and used through hydraulic cylinders, electric cylinders, pneumatic cylinders, etc., making it suitable for a wide range of equipment.

[0022] 5. This utility model has a wide range of applications. For example, it can be connected to a rechargeable hydraulic power source, which has good mobility and is suitable for field or flexible operation scenarios. It can also be used with a split spring return cylinder and an electric pump. With its large oil storage and discharge capacity, it has the characteristic of slow oil temperature rise and is more suitable for large-volume continuous pressing operations. Attached Figure Description

[0023] Figure 1 This is a perspective view of the present invention.

[0024] Figure 2 This is a schematic diagram of the overall structure of this utility model.

[0025] Figure 3 This is a schematic diagram of the structure of the fixed molding assembly of this utility model.

[0026] Figure 4 This is a schematic diagram of the structure of the movable molding assembly of this utility model.

[0027] Figure 5 This is a schematic diagram of the pressing size adjustment component of this utility model.

[0028] Figure 6 This is a schematic diagram of the overall connection component of this utility model.

[0029] Reference numerals: 100, Fixed pressing mold assembly; 101, Fixed pressing mold cutter; 102, First fixed slider pressing mold cutter; 103, Second fixed slider pressing mold cutter; 104, First fixed slider spring; 105, Second fixed slider spring; 200, Movable pressing mold assembly; 201, Movable pressing mold cutter; 202, First movable slider pressing mold cutter; 203, Second movable slider pressing mold cutter; 204, First movable slider spring; 205, Second movable slider spring; 300, Pressing size adjustment assembly; 301, Guide connector; 302, Piston rod; 303, First knurled adjusting nut; 304, Second knurled adjusting nut; 305, Cylinder body connector; 306, Scale; 400, Overall connection assembly; 401, Outer connecting plate; 402, Front fastener; 403, Rear fastener. Detailed Implementation

[0030] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0031] In the description of this application, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0032] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Example

[0033] Reference Figure 1 and Figure 2The present invention discloses a mechanical stroke control-free hexagonal crimping pliers, comprising a main body and a fixed crimping mold assembly 100, a movable crimping mold assembly 200, a crimping size adjustment assembly 300, and an overall connection assembly 400 mounted on the main body.

[0034] Reference Figure 3 The fixed molding assembly 100 includes a fixed molding cutter 101, a first fixed slider molding cutter 102, a second fixed slider molding cutter 103, a first fixed slider spring 104, and a second fixed slider spring 105. The first fixed slider molding cutter 102 and the second fixed slider molding cutter 103 slide together via a 120° contact angle. The first fixed slider molding cutter 102 is reset by the first fixed slider spring 104, and the second fixed slider molding cutter 103 is reset by the second fixed slider spring 105.

[0035] The fixed pressing die 101 is fixedly installed on the main body. The fixed pressing die 101 has a first sliding groove. The first fixed slider pressing die 102 and the second fixed slider pressing die 103 are provided with a first slider. The first slider slides in cooperation with the first sliding groove, so that the lower side handle of the first fixed slider pressing die 102 and the second fixed slider pressing die 103 can slide synchronously when pressed.

[0036] The first fixed slider spring 104 is installed between the first fixed slider pressing die 102 and the fixed pressing die 101, and is used to provide a reverse support force to the first fixed slider pressing die 102 during the pressing process, and to reset the first fixed slider pressing die 102 after pressing is completed; the second fixed slider spring 105 is installed between the second fixed slider pressing die 103 and the fixed pressing die 101, and is used to provide a reverse support force to the second fixed slider pressing die 103 during the pressing process, and to reset the second fixed slider pressing die 103 after pressing is completed.

[0037] Reference Figure 4 The movable molding assembly 200 includes a movable molding cutter 201, a first movable slider molding cutter 202, a second movable slider molding cutter 203, a first movable slider spring 204, and a second movable slider spring 205. The first movable slider molding cutter 202 and the second movable slider molding cutter 203 slide together via a 120° contact angle. The first movable slider molding cutter 202 is reset by the first movable slider spring 204, and the second movable slider molding cutter 203 is reset by the second movable slider spring 205.

[0038] The movable pressing die 201 is fixedly installed on the main body. The movable pressing die 201 has a second sliding groove. The first movable slider pressing die 202 and the second movable slider pressing die 203 are provided with a second slider. The second slider slides in cooperation with the second sliding groove, so that the lower shank of the first movable slider pressing die 202 and the second movable slider pressing die 203 can slide synchronously when pressed.

[0039] The first movable slider spring 204 is installed between the first movable slider pressing die 202 and the movable pressing die 201, and is used to provide a reverse support force to the first movable slider pressing die 202 during the pressing process, and to reset the first movable slider pressing die 202 after pressing is completed; the second movable slider spring 205 is installed between the second movable slider pressing die 203 and the movable pressing die 201, and is used to provide a reverse support force to the second movable slider pressing die 203 during the pressing process, and to reset the second movable slider pressing die 203 after pressing is completed.

[0040] Reference Figure 5 The pressing size adjustment assembly 300 includes a guide connector 301, a piston rod 302, a first knurled adjusting nut 303, a second knurled adjusting nut 304, a cylinder body connector 305, and a scale 306. One side of the piston rod 302 is fixedly connected to the movable pressing mold assembly 200, and the other side is movably connected to the cylinder body connector 305. The first knurled adjusting nut 303 and the second knurled adjusting nut 304 are connected to the piston rod 302 through internal threads, and the two interlock to form an adjustable mechanical limiting structure.

[0041] The guide connector 301 is fixedly connected to the cylinder connector 305. The piston rod 302 can make a relatively linear feed motion. It is driven by the pressure or thrust transmitted inside the cylinder connector 305 and transmits power to the moving die assembly 200 to complete the pressing motion. At the same time, the piston rod 302 is provided with an external thread that meshes with the internal thread. The positions of the first knurled adjusting nut 303 and the second knurled adjusting nut 304 can be adjusted by the thread. When the first knurled adjusting nut 303 and the second knurled adjusting nut 304 are pressed together, they are interlocked by the contact pressure and together form a stable mechanical limiting structure to control the extension length of the piston rod 302, and thereby control the pressing stroke of the moving die assembly 200, thus controlling the pressing size of the hexagonal pressing die.

[0042] The first knurled adjusting nut 303 and the second knurled adjusting nut 304 have knurled edges on their outer sides to increase the contact area and friction. The knurling allows for easy adjustment of the nut position by hand or other clamping devices. A scale 306 visually indicates the current adjustment position during the adjustment process. By aligning the upper graduations of the scale 306 with the upper groove of the first knurled adjusting nut 303, the target stroke can be quickly achieved.

[0043] Reference Figure 6 The overall connection assembly 400 includes an outer connecting plate 401, a front fastener 402 and a rear fastener 403. The outer connecting plate 401 is fixedly connected to the fixed die 101 through the front fastener 402 and fixedly connected to the guide connector 301 through the rear fastener 403. Example

[0044] An operating system includes the mechanical stroke control mold-free hexagonal crimping pliers of Embodiment 1 above, and also includes a hydraulic drive source, which is a 700bar standard electric pump, foot pump or PLC-controlled electric pump.

[0045] The implementation principle of this utility model is as follows: This utility model discloses a mechanical stroke-controlled, mold-change-free hexagonal crimping pliers and its operating system, belonging to the field of hydraulic tool technology. The crimping pliers mainly consist of a fixed crimping mold assembly 100, a movable crimping mold assembly 200, a crimping size adjustment assembly 300, and an overall connecting assembly 400. Its core innovation lies in: through the piston rod 302 and its precision threads in the crimping size adjustment assembly 300, in conjunction with the interlocking first knurled adjusting nut 303 and second knurled adjusting nut 304, an adjustable mechanical limit structure is formed. By manually rotating the nut and setting it according to the scale 306, the extension length of the piston rod 302 can be precisely controlled, thereby steplessly adjusting the crimping stroke of the movable crimping mold assembly 200, achieving precise control of the hexagonal crimping size for different specifications of wires and terminals, completely eliminating the need to change molds. The slider crimping blades in the fixed and movable crimping mold assemblies 200 achieve synchronous sliding through a 120° contact angle design and are automatically reset by a spring. This invention features a compact structure, simple and quick adjustment, no calibration required, stable and reliable crimping process, strong anti-interference capability, and long service life. It is suitable for various operating scenarios and significantly improves crimping efficiency and quality consistency. The operating system also includes a compatible 700bar standard hydraulic drive source.

[0046] The embodiments described herein are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. A mechanical travel controlled dieless hexagonal crimping tool, characterized by, It includes a main body and a fixed pressing mold assembly (100), a movable pressing mold assembly (200), a pressing size adjustment assembly (300), and an overall connection assembly (400) mounted on the main body; The fixed molding assembly (100) includes a fixed molding blade (101), a first fixed slider molding blade (102), a second fixed slider molding blade (103), a first fixed slider spring (104), and a second fixed slider spring (105). The first fixed slider molding blade (102) and the second fixed slider molding blade (103) slide together via a 120° contact angle. The first fixed slider molding blade (102) is reset by the first fixed slider spring (104), and the second fixed slider molding blade (103) is reset by the second fixed slider spring (105). The movable molding assembly (200) includes a movable molding cutter (201), a first movable slider molding cutter (202), a second movable slider molding cutter (203), a first movable slider spring (204), and a second movable slider spring (205). The first movable slider molding cutter (202) and the second movable slider molding cutter (203) slide together via a 120° contact angle. The first movable slider molding cutter (202) is reset by the first movable slider spring (204), and the second movable slider molding cutter (203) is reset by the second movable slider spring (205). The pressing size adjustment assembly (300) includes a guide connector (301), a piston rod (302), a first knurled adjusting nut (303), a second knurled adjusting nut (304), a cylinder body connector (305), and a scale (306). One side of the piston rod (302) is fixedly connected to the movable pressing mold assembly (200), and the other side is movably connected to the cylinder body connector (305). The first knurled adjusting nut (303) and the second knurled adjusting nut (304) are connected to the piston rod (302) through internal threads, and the two interlock to form an adjustable mechanical limiting structure. The overall connection assembly (400) includes an outer connecting plate (401), a front fastener (402), and a rear fastener (403). The outer connecting plate (401) is fixedly connected to the fixed die-cutting knife (101) through the front fastener (402) and fixedly connected to the guide connector (301) through the rear fastener (403).

2. The mechanical travel controlled dieless hexagonal crimping tool of claim 1, wherein, The fixed molding die (101) is fixedly installed on the main body. The fixed molding die (101) is provided with a first sliding groove. The first fixed slider molding die (102) and the second fixed slider molding die (103) are provided with a first slider. The first slider slides in cooperation with the first sliding groove, so that the lower handle of the first fixed slider molding die (102) and the second fixed slider molding die (103) can slide synchronously when pressed.

3. The mechanical travel controlled dieless hexagonal crimping tool of claim 1, wherein, The first fixed slider spring (104) is installed between the first fixed slider pressing die (102) and the fixed pressing die (101) to provide reverse support force to the first fixed slider pressing die (102) during the pressing process and to reset the first fixed slider pressing die (102) after the pressing is completed. The second fixed slider spring (105) is installed between the second fixed slider pressing die (103) and the fixed pressing die (101) to provide a reverse support force to the second fixed slider pressing die (103) during the pressing process and to reset the second fixed slider pressing die (103) after the pressing is completed.

4. The mechanical travel controlled dieless hexagonal crimping tool of claim 1, wherein, The movable die-cutting knife (201) is fixedly installed on the main body. A second sliding groove is provided on the movable die-cutting knife (201). A second slider is provided below the first movable slider die-cutting knife (202) and the second movable slider die-cutting knife (203). The second slider slides in cooperation with the second sliding groove, so that the lower handle of the first movable slider die-cutting knife (202) and the second movable slider die-cutting knife (203) can slide synchronously when pressed.

5. The mechanical travel controlled dieless hexagonal crimping tool of claim 1, wherein, The first movable slider spring (204) is installed between the first movable slider pressing die (202) and the movable pressing die (201) to provide a reverse support force to the first movable slider pressing die (202) during the pressing process and to reset the first movable slider pressing die (202) after the pressing is completed. The second movable slider spring (205) is installed between the second movable slider pressing die (203) and the movable pressing die (201) to provide a reverse support force to the second movable slider pressing die (203) during the pressing process and to reset the second movable slider pressing die (203) after the pressing is completed.

6. The mechanical travel controlled dieless hexagonal crimping tool of claim 1, wherein, The guide connector (301) is fixedly connected to the cylinder connector (305). The piston rod (302) can make a relatively linear feed motion. It is driven by the pressure or thrust transmitted inside the cylinder connector (305) and transmits power to the moving mold assembly (200) to complete the pressing motion. At the same time, the piston rod (302) is provided with an external thread that meshes with the internal threads of the first knurled adjusting nut (303) and the second knurled adjusting nut (304). The positions of the first knurled adjusting nut (303) and the second knurled adjusting nut (304) can be adjusted by threads. When the first knurled adjusting nut (303) and the second knurled adjusting nut (304) are pressed together, they interlock through contact pressure and together form a stable mechanical limiting structure to control the extension length of the piston rod (302) and thereby control the pressing stroke of the moving pressing die assembly (200), thereby controlling the pressing size of the hexagonal pressing die.

7. The mechanical travel controlled dieless hexagonal crimping tool of claim 1, wherein, The first knurled adjusting nut (303) and the second knurled adjusting nut (304) have knurling on their outer sides to increase the contact area and friction. The position of the nut can be adjusted by hand or by clamping device through the knurling.

8. The mechanical travel controlled dieless hexagonal crimping tool of claim 1, wherein, The scale (306) is used to visually indicate the current adjustment position during the adjustment process. By having the upper scale of the scale (306) correspond to the upper groove of the first knurled adjusting nut (303), the target stroke can be quickly adjusted.

9. A working system comprising the mechanical stroke-controlled, mold-change-free hexagonal crimping pliers according to any one of claims 1-8, characterized in that, It also includes a hydraulic drive source, which is a 700-bar standard electric pump, foot pump, or PLC-controlled electric pump.

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