A pin connector for a PLC module base unit

Abstract

The application discloses a pin connector for a PLC module base unit, and relates to the technical field of electronic component and assembly manufacturing, which comprises an insulating shell, an integrated contact pin assembly, a screw locking mechanism and a circuit transmission line. The pin assembly is arranged in high density by 18 square pins with a size of 0.98mm*0.98mm, and is matched with a multilayer PCB to realize stable transmission of multiple signals; the screw locking mechanism is composed of an adjusting screw, a pressing plate and a return spring, and the pressing plate is driven to move by the screw feeding to press and unlock the base spring button. The application can be self-locked and turned on by overall pressing, and can be quickly disassembled by rotating the screw with a tool, thereby saving the traditional wiring process, and having the advantages of high assembly efficiency, reliable connection, simple operation, compact structure, good protection and the like. The application is suitable for PLC module bases such as Siemens ET200SP, can significantly improve the field wiring and maintenance efficiency, and reduce the wiring error rate.

Description

Technical Field

[0001] This invention relates to the field of electronic component and assembly manufacturing technology, and more specifically to a pin connector for a PLC module base unit. Background Technology

[0002] In the field of industrial automation control, programmable logic controllers (PLCs) are widely used in production lines, equipment control, and distributed I / O systems. Modular PLC base units, such as the Siemens ET200SP, typically require stripping and connecting external signal and power lines one by one to terminals and tightening them during on-site assembly and debugging. This traditional wiring method has significant drawbacks: low assembly efficiency: single-circuit, single-wire wiring is cumbersome and time-consuming, making it difficult to meet the needs of batch assembly and rapid line changeover; prone to wiring errors: when multiple circuits are densely wired, problems such as incorrect connections, missing connections, and loose connections are prone to occur, affecting system stability and debugging cycle; inconvenient disassembly and maintenance: when equipment is repaired or modules are replaced, each wire must be disconnected, which is complex and prolongs downtime; poor space utilization: traditional terminal structures are bulky, which is not conducive to miniaturization and high-density arrangement, and is difficult to adapt to compact module designs.

[0003] To improve wiring efficiency, some integrated connectors have emerged in the existing technology, but they have problems such as being unable to be plugged in or unplugged, unreliable locking, easy loosening and rebound, and insufficient contact stability. Moreover, most of them do not adopt the high-density design approach to adapt to miniaturized modules, and cannot simultaneously meet the usage requirements of quick assembly and disassembly, self-locking, high-density connection and high positioning accuracy.

[0004] Therefore, in view of the existing problems, how to provide a dedicated pin connector for PLC module base unit that is compact in structure, efficient in wiring, reliable in locking, and convenient in disassembly and assembly is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a pin connector for PLC module base units, which enables modular pre-assembly, integrated curing, self-locking during insertion, and screw-driven unlocking. This solves the problems of low efficiency, cumbersome maintenance, unreliable locking of existing integrated connectors, and poor product consistency associated with traditional terminal wiring.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A pin connector for a PLC module base unit, comprising: Insulating outer casing; An integrated contact pin assembly is fixed inside the insulating housing and is used to contact the spring contacts of the base unit to achieve electrical signal conduction. A screw locking mechanism includes an adjusting screw, an O-ring, and a pressure plate. The adjusting screw is threaded into the insulating housing. The pressure plate is located below the adjusting screw and abuts against the O-ring. The O-ring is tightly fitted onto the adjusting screw. The left and right sides of the pressure plate are parallel to the side plates of the insulating housing. The two ends of the pressure plate are respectively limited by equal-height screws and return springs to keep the end faces flush. The bottom of the pressure plate can penetrate the bottom plate of the insulating housing. A circuit transmission assembly, which is mounted on the insulating housing and electrically connected to the integrated contact pin assembly, is used to realize signal and power transmission. When the adjusting screw is in its initial high position, the integrated contact pin assembly moves downward under the action of external force. The square pin of the integrated contact pin assembly is inserted into the spring of the base unit, and the spring of the base unit automatically clamps the square pin to complete the locking and conduction. When the adjusting screw is turned downward, the pressure plate moves down synchronously to press the spring of the base unit. The spring of the base unit opens to release the square pin, and the integrated contact pin assembly can be directly pulled out from the base unit to complete the unlocking and disassembly.

[0008] Through the above technical solution, this invention provides a pin connector for a PLC module base unit, establishing a complete basic structure for the connector. Relying on the coordinated operation of the insulating shell, integrated pin assembly, screw locking mechanism, and circuit transmission components, it achieves automatic clamping and self-locking of the square pins by pressing, enabling stable transmission of multiple signals at once. This eliminates the need for traditional wire-by-wire wiring, improving assembly efficiency. Simultaneously, by turning the adjusting screw, the pressure plate moves downwards, pressing the base spring to unlock and remove the entire connector. Maintenance and repair do not require wire-by-wire disconnection. The pressure plate maintains a flat end face with bidirectional limiting by equal-height screws and a return spring, and an O-ring prevents the adjusting screw from falling off. The entire structure balances connection reliability, ease of assembly and disassembly, and structural stability, making it suitable for high-density signal transmission scenarios in PLC base units.

[0009] Preferably, the aforementioned pin connector for a PLC module base unit further includes a nut seat, which is assembled inside the insulating housing and has a pre-drilled glue injection hole. After the pre-assembled integrated contact pin assembly is installed into the insulating housing for positioning and fixation, the nut seat is installed and adhesive is injected into the pre-drilled glue injection hole, thus bonding the integrated contact pin assembly, the nut seat, and the insulating housing into a single unit. The addition of a nut seat structure with a glue injection hole, allowing for adhesive injection after the integrated pin assembly is installed into the insulating housing and fitted with the nut seat, effectively bonds the insulating housing, the nut seat, and the integrated pin assembly into a single unit. This eliminates assembly gaps between components, significantly improving the overall shock and impact resistance of the connector. Simultaneously, the nut seat enables rapid positioning of pre-assembled components, and standardized glue injection processes allow for unified control of assembly dimensions, effectively reducing differences in contact performance between batch products and improving product consistency.

[0010] Preferably, in the aforementioned pin connector for a PLC module base unit, the integrated contact pin assembly includes a pin PCB board, a signal PCB board, a signal line, a plug-in connector, and a lead-out socket. One end of the signal PCB board is soldered to the signal line, and the other end of the pin PCB board is fixed to the signal PCB board by soldering. The plug-in connector is fixed to the lead-out socket, and its tail pin is soldered to the signal PCB board. The pin PCB board is parallel to the insulating housing base plate and is arranged perpendicular to the signal PCB board. The nut seat is sleeved on the side of the insulating housing and is perpendicular to the signal PCB board. The pin PCB board and the signal PCB board are arranged vertically and three-dimensionally, making full use of the small space inside the housing to achieve miniaturized high-density integration. Each electrical component can be prefabricated and assembled offline, and a single damaged component can be replaced individually, reducing the overall maintenance cost. The combined structure of the lead-out socket, plug-in connector, and signal line organizes the circuit routing, avoids cable twisting and pulling causing solder joint breakage, and ensures long-term electrical connection stability.

[0011] Preferably, in the aforementioned pin connector for a PLC module base unit, 18 0.98mm × 0.98mm square pins are densely arrayed on the surface of the pin PCB board. Each square pin is vertically fixed to the lower surface of the pin PCB board, and each square pin corresponds one-to-one with the spring contact point inside the base unit, forming a detachable flexible electrical connection. The array of 18 0.98mm × 0.98mm square pins on the pin PCB board, with the pins vertically fixed and corresponding one-to-one with the spring contact point of the Siemens ET200SP base, allows for simultaneous flexible connection of 18 circuits in one go. This high-density integrated arrangement replaces the traditional single-terminal, single-channel wiring mode. Standardized dimensions match the dedicated PLC base, ensuring stable contact resistance under long-term industrial conditions and guaranteeing continuous and reliable signal transmission.

[0012] Preferably, in the aforementioned pin connector for a PLC module base unit, each square pin has a surrounding chamfered guide structure at its lower insertion point. This chamfered structure eliminates the sharp edges of the square pin ends, enabling automatic alignment and guidance during insertion, preventing damage to the base's spring contacts. The cable outlet has a positioning groove, within which the plug-in connector is fitted, preventing rotation. A cable outlet through-hole is provided at the top of the cable outlet, through which the signal line passes. A limiting slot is provided inside the cable outlet, allowing it to be fixed to the insulating shell, tightening the shell and stabilizing the overall dimensions. The surrounding chamfered guide structure at the square pin insertion point eliminates sharp edges, automatically guiding alignment during insertion, reducing the difficulty of blind insertion on-site, and preventing sharp pin edges from scratching and damaging the base's internal spring contacts, thus reducing base wear and extending the overall service life of the connector and its matching base.

[0013] Preferably, in the above-mentioned pin connector for a PLC module base unit, the cable outlet is provided with a positioning groove, and the plug-in connector is assembled in the positioning groove to prevent it from rotating; the upper part of the cable outlet has a cable outlet through hole, through which the signal line passes; the cable outlet has a limiting slot inside, and the cable outlet is assembled and fixed on the insulating shell, which can tighten the insulating shell and stabilize the overall size. By limiting the plug-in connector through the positioning groove inside the cable outlet, the rotation of the cable is restricted, preventing the internal solder joints from breaking due to cable torsion fatigue. The cable outlet through hole opened in the cable outlet uniformly accommodates the signal line, resulting in neat and standardized wiring. After assembly, the built-in limiting slot can tighten the insulating shell, stabilize the overall size of the machine, avoid shell deformation affecting the pin connection accuracy, and reduce the interference and misoperation risks caused by messy wiring on site.

[0014] Preferably, in the above-mentioned pin connector for a PLC module base unit, the reset spring is a compression spring. Multiple sets of the reset springs are evenly distributed below both ends of the pressure plate. When the adjusting screw is loosened and retracted, the reset spring continuously provides an upward pushing force, driving the pressure plate to automatically reset and lift. Using multiple evenly distributed compression springs as reset springs allows the springs to continuously output an upward pushing force when the screw is loosened, driving the pressure plate to automatically lift and reset. This eliminates the need for manual adjustment of the pressure plate, allowing for repeated insertion and use. Furthermore, the springs are evenly distributed at both ends of the pressure plate, ensuring balanced force when the pressure plate is pressed down to unlock, enabling simultaneous pressing of all base spring contacts, resulting in smooth unlocking without any one-sided jamming.

[0015] Preferably, the aforementioned pin connector for a PLC module base unit also includes a protective cover. This protective cover is rotatably mounted on the top of the insulating housing and completely covers the operating end of the adjusting screw. This prevents dust and debris from entering the locking mechanism and also prevents accidental unlocking caused by accidentally tightening the screw. Adding a rotatable protective cover that completely covers the operating end of the adjusting screw not only prevents industrial dust and debris from entering the locking mechanism, preventing thread corrosion and jamming, but also prevents accidental screw tightening by personnel, avoiding accidental unlocking and detachment of the connector, ensuring continuous and stable operation of the industrial control system, and improving on-site safety.

[0016] Preferably, in the above-mentioned pin connector for a PLC module base unit, a positioning step is provided between the nut seat and the inner wall of the insulating shell, enabling rapid alignment during assembly. An injection hole is located at the top of the nut seat, where adhesive fills the gaps between the nut seat, the insulating shell, and the integrated pin assembly, forming an integrated shock-resistant structure after curing. The positioning step between the nut seat and the inner wall of the insulating shell allows for rapid alignment and engagement during assembly, eliminating repeated calibration steps and improving assembly line efficiency. The injection hole at the top of the nut seat fully fills all gaps between the insulating shell, the nut seat, and the integrated pin assembly after adhesive injection, forming a high-strength integrated shock-resistant structure after curing, significantly improving the connector's vibration and impact resistance.

[0017] Preferably, in the above-mentioned pin connector for a PLC module base unit, when the adjusting screw is turned downwards, it drives the pressure plate to press down and clamp the spring of the base unit, allowing the pin connector to be pulled out of the base unit. After the adjusting screw is loosened, the return spring pushes the pressure plate upwards to automatically reset. The complete workflow of screw unlocking and spring reset is clear and controllable. Turning the adjusting screw downwards drives the pressure plate to press down on the base spring to complete the disassembly. After the screw is loosened in the opposite direction, the return spring automatically pushes the pressure plate upwards to reset. The entire set of action logic is clear and controllable, ensuring that the connector can be repeatedly plugged and unplugged without the pressure plate getting stuck in a low position. It automatically returns to a ready state before each plugging, effectively reducing the probability of plugging misalignment and extending the product's reuse cycle.

[0018] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a pin connector for a PLC module base unit, which has the following beneficial effects: 1. Modular offline pre-assembly and integrated contact pin assembly: all parts can be disassembled individually, greatly simplifying the overall assembly process and significantly improving production line efficiency; individual damaged parts can be replaced individually without the need for overall scrapping, reducing after-sales maintenance costs.

[0019] 2. The nut seat is integrally cured and molded with glue, eliminating the assembly gap between the insulating shell, integrated pin assembly and nut seat, which greatly improves the vibration and impact resistance; the standardized glue injection process uniformly controls the assembly dimensions, making batch products more consistent and the contact stability controllable.

[0020] 3. The press-fit self-locking structure allows for the synchronous conduction of 18 signals simply by pressing the connector vertically, completely replacing the traditional process of stripping wires one by one and locking each terminal one by one. This significantly shortens the assembly time and eliminates the problems of incorrect or missing connections caused by dense wiring, thereby improving the operational stability of the automated control system.

[0021] 4. The screw-driven pressure plate mechanical unlocking eliminates the need to press each base spring individually; simply rotating the screw automatically releases the pins, simplifying equipment maintenance, module replacement, and disassembly processes and reducing production line downtime for maintenance.

[0022] 5. The square gold-plated pins are paired with a chamfered guide structure and high-density integrated arrangement, which is compatible with compact PLC bases, has high positioning accuracy and stable contact resistance, and is suitable for long-term continuous industrial operation. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0024] Figure 1 A schematic diagram of the appearance of a pin connector for a PLC module base unit provided by the present invention; Figure 2 An exploded view of the structure of a pin connector for a PLC module base unit provided by the present invention.

[0025] in: 1-Insulating shell; 2-Pin PCB board; 3-Signal PCB board; 4-Nut seat; 5-Reset spring; 6-O-ring; 7-Pressure plate; 8-Equal height screw; 9-Screw; 10-Cover plate; 11-18 core signal cable; 12-Preload nut; 13-Plug-in connector; 14-Cable outlet. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Example: Screw 9 is an M5 screw; plug-in connector 13 is an M8 plug-in connector 13.

[0028] Pre-fabricated integrated contact pin assembly The integrated contact pin assembly includes a connector 14, a pin PCB board 2, a signal PCB board 3, an 18-core signal cable 11, and a plug-in connector 13. All components are independent and can be disassembled and replaced individually. The prefabrication process is as follows: First, the square pin is soldered and fixed on the pin PCB board 2. After that, the pin PCB board 2 and the signal PCB board 3 are butt-welded together. Then, the signal cable 11 is soldered onto the signal PCB board 3. The soldered signal cable 11 passes through the through hole of the connector 14. After that, the plug-in connector 13 is snapped and fixed to the end of the connector 14. Finally, the pins of the plug-in connector 13 are soldered to the signal PCB board 3 to complete the overall prefabrication of the integrated contact pin assembly.

[0029] Overall assembly process The prefabricated integrated contact pin assembly is placed inside the insulating housing 1 for positioning and fixation. Then, the nut seat 4 is installed into the corresponding installation position of the insulating housing 1. AB glue is injected into the pre-reserved glue injection hole of the nut seat 4. After the glue is fully cured, the integrated contact pin assembly, nut seat 4, and insulating housing 1 are tightly bonded together. The unlocking mechanism is pre-assembled first: the screw 9 is inserted into the corresponding through hole of the pressure plate 7, and then the O-ring 6 is put on the shank of the screw 9. The pressure plate 7 is limited by the O-ring 6, and the screw 9 will not fall off after the pressure plate 7 is flipped. After the glue is fully cured, the reset spring 5 is installed inside the insulating housing 1, and then the above-mentioned integrated component is installed into the insulating housing 1 so that the screw 9 and the nut seat 4 are threaded together by 1mm. Finally, the equal height screw 8, protective cover plate 10, and other components are assembled. This curing method enhances the overall structural strength of the connector, preventing internal components from shifting or loosening in continuous industrial vibration environments. Furthermore, the standardized injection curing process allows for precise control of the assembly gaps and positioning dimensions of each component, ensuring high uniformity in assembly accuracy and contact stability for each product and reducing performance variations in batches.

[0030] Overall working principle When the M5 screw 9 is in its initial high position, the pressure plate 7 remains floating under the support of the return spring 5. When the connector is pressed vertically downwards by external force, the square pin of the integrated contact pin assembly inserts into the base spring. The base's own spring retracts inwards to clamp the pin, achieving self-locking conduction without operating the screw 9. Using a tool, the screw 9 is turned downwards in the forward direction. The bottom of the M5 screw 9 directly presses against the pressure plate 7, causing it to move downwards. The bottom of the pressure plate 7 passes through the base plate of the insulating housing 1 and presses the base spring button, causing the spring to open outwards and release the pin. At this point, the connector can be pulled upwards directly. The O-ring 6 is fitted onto the screw 9 shaft to limit and prevent the screw 9 from being loosened excessively in the reverse direction and falling off. After disassembly, the screw 9 is loosened in the reverse direction, and the return spring 5 pushes the pressure plate 7 upwards to return to its initial assembly state, allowing for repeated insertion and use. See appendix Figure 1 Appendix Figure 2 This embodiment discloses a pin connector for a PLC module base unit. The main body includes an insulating shell 1, an integrated contact pin assembly, a screw locking mechanism, and a nut seat 4. The integrated contact pin assembly is fixed inside the insulating shell 1 and is used to contact the spring contacts of the PLC base unit to achieve multi-channel electrical signal conduction. The screw locking mechanism consists of a screw 9, an O-ring 6, a pressure plate 7, a return spring 5, and a height-equalizing screw 8. The screw locking mechanism relies on the threaded feed to drive the pressure plate 7 to press down and complete the unlocking. The nut seat 4 is assembled inside the insulating shell 1 and is integrally cured with AB glue to achieve a stable connection of the components. The method of use and working principle of this invention are as follows: Plug-in self-locking conduction state With screw 9 in its initial high position, pressure plate 7 remains floating under the support of multiple sets of reset springs 5; the connector is aligned with the PLC module base unit socket and pressed down vertically, and the square pins at the bottom of the integrated contact pin assembly are simultaneously inserted between the spring sheets inside the base. The spring sheets of the base are opened by the pins and then spring back inward to clamp the square pins. The 18-channel signal self-locking conduction can be completed without operating screw 9.

[0031] Tool unlocking and disassembly process Using the accompanying tools, screw 9 is fed downwards in the forward direction, with the screw head directly pressing against the pressure plate 7 and moving downwards simultaneously. The push post extending from the bottom of the pressure plate 7 penetrates the base plate of the insulating housing 1. Pressing the spring release button of the base unit causes the base spring to open outwards, releasing the square pin. At this point, the connector can be pulled out directly upwards, completing the disassembly of the entire machine. The O-ring 6 mounted on the screw 9 only serves as a limit stop to prevent the screw from being loosened excessively in the reverse direction and falling off the nut seat 4; it does not have the function of squeezing the pressure plate.

[0032] Automatic mechanism reset After disassembly, loosen screw 9 in the reverse direction and retract it upwards. The return spring 5 releases its elastic force to push the pressure plate 7 upwards to reset, restoring the initial floating assembly state. The connector can then be aligned with the base again for insertion and use.

[0033] This invention achieves automatic locking and connection through vertical pressing, and can be quickly unlocked and pulled out by simply rotating a single screw with a tool. It abandons the traditional terminal wiring mode, simplifies assembly and maintenance, ensures good consistency in mass production, provides stable shock-resistant connection, and is suitable for long-term industrial automation operation.

[0034] The prefabricated integrated contact pin assembly is placed inside the insulating shell for positioning and fixation. Then, the nut seat is installed into the corresponding installation position on the insulating shell. AB glue is injected into the pre-drilled injection hole in the nut seat. After the glue fully cures, the integrated contact pin assembly, nut seat, and insulating shell are tightly bonded together. The unlocking mechanism is pre-assembled first: the screw is inserted into the corresponding through hole of the pressure plate, and an O-ring is fitted onto the screw shank. The pressure plate is limited by the O-ring, preventing the screw from falling off even after the pressure plate is flipped. After the glue is fully cured, a reset spring is installed inside the insulating shell, and then the above-mentioned integrated assembly is installed into the insulating shell, ensuring a 1mm thread engagement between the screw and the nut seat. Finally, the equal-height screw, protective cover, and other components are assembled. This curing and molding method improves the overall structural strength of the connector, preventing internal component misalignment and loosening in continuous industrial vibration environments. Furthermore, the standardized injection curing process allows for precise control of the assembly gaps and positioning dimensions of each component, ensuring high uniformity in assembly accuracy and contact stability for each product, and reducing performance variations in batch products.

[0035] Working logic of the screw locking mechanism: When the M5 screw is in the initial high position, the pressure plate remains in an upward state under the support of the return spring; when the external force presses the connector vertically downward, the square pin of the integrated contact pin assembly inserts into the base spring, and the base has its own spring to clamp the pin, completing self-locking conduction without operating the screw; when using a tool to turn the screw forward and feed it downward, the bottom of the screw directly presses against the pressure plate and drives the pressure plate to move downward, the bottom of the pressure plate passes through the insulating shell base plate and presses the base spring button, the spring opens outward to release the pin, at which point the connector can be pulled upward directly; the O-ring is provided on the screw rod to limit and block the screw, preventing the screw from being loosened too much in the reverse and falling off; after disassembly, when the screw is loosened in the reverse, the return spring pushes the pressure plate upward to reset, restoring the initial assembly state, and it can be repeatedly plugged in and used.

[0036] Further optimization of the solution: The internal pin PCB board and signal PCB board of the integrated contact pin assembly are arranged vertically and three-dimensionally, making full use of the narrow space inside the insulating shell to achieve miniaturized multi-channel integration; the pin PCB board uniformly arranges 18 0.98mm×0.98mm square pins, the size of which is precisely matched with the Siemens ET200SP base spring contact; the pins are made of copper alloy gold-plated material, which has excellent conductivity, corrosion resistance and resistance to frequent insertion and removal, and the pin head is set with a chamfered guide structure to reduce the difficulty of blind insertion and avoid scratching the base spring.

[0037] The pin PCB and signal PCB are electrically interconnected via board-to-board connectors, ensuring a stable connection and facilitating modular assembly. A rotatable protective cover is installed above the M5 screw to prevent dust and foreign objects from entering the locking mechanism, while also preventing accidental unlocking due to accidental contact on-site, thus improving safety in industrial use.

[0038] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to in the method section.

[0039] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pin connector for a PLC module base unit, characterized by, include: Insulating outer casing (1); An integrated contact pin assembly is fixed inside the insulating housing (1) and is used to contact the spring contacts of the base unit to achieve electrical signal conduction. The screw locking mechanism includes an adjusting screw (9), an O-ring (6), and a pressure plate (7). The adjusting screw (9) is threaded into the insulating shell (1). The pressure plate (7) is located below the adjusting screw (9) and abuts against the O-ring (6). The O-ring (6) is tightly fitted onto the adjusting screw (9). The left and right sides of the pressure plate (7) are parallel to the side plates of the insulating shell (1). The two ends of the pressure plate are respectively limited by equal-height screws (8) and return springs (5) to keep the end faces flush. The bottom of the pressure plate (7) can penetrate the bottom plate of the insulating shell (1). A circuit transmission assembly is mounted on the insulating housing (1) and electrically connected to the integrated contact pin assembly for signal and power transmission. When the adjusting screw (9) is in the initial high position, the integrated contact pin assembly moves downward as a whole under the action of external force. The square pin of the integrated contact pin assembly is inserted into the spring of the base unit. The spring of the base unit automatically clamps the square pin to complete the locking and conduction. When the adjusting screw (9) is turned downward, the pressure plate (7) moves down synchronously to press the spring of the base unit. The spring of the base unit opens to release the square pin. The integrated contact pin assembly can be directly pulled out from the base unit to complete the unlocking and disassembly.

2. The pin connector for a PLC module base unit according to claim 1, characterized by The nut seat (4) is assembled inside the insulating shell (1), and the nut seat (4) has a reserved glue injection hole; after the pre-assembled integrated contact pin assembly is installed into the insulating shell (1) for positioning and fixing, the nut seat (4) is installed and adhesive is injected into the reserved glue injection hole so that the integrated contact pin assembly, the nut seat (4) and the insulating shell (1) are bonded together as a whole.

3. A plug-in connector for a PLC module base unit according to claim 2, characterized in that The integrated contact pin assembly includes a pin PCB board (2), a signal PCB board (3), a signal line (11), a plug-in connector (13), and a wire outlet (14). One end of the signal PCB board (3) is soldered to the signal line (11). The other end of the pin PCB board (2) is fixed to the signal PCB board (3) by soldering through a pad. The plug-in connector (13) is fixed on the wire outlet (14), and its tail pin is soldered to the signal PCB board (3). The pin PCB board (2) is parallel to the bottom plate of the insulating shell (1) and is arranged perpendicular to the signal PCB board (3). The nut seat (4) is sleeved on the side of the insulating shell (1) and is perpendicular to the signal PCB board (3).

4. The pin connector for a PLC module base unit according to claim 3, wherein The pin PCB board (2) has 18 square pins of 0.98mm×0.98mm arranged in a dense array on its surface. Each square pin is vertically fixed to the lower surface of the pin PCB board (2). The square pins correspond one-to-one with the spring contacts inside the base unit to form a detachable elastic electrical connection.

5. A pin connector for a PLC module base unit according to claim 4, characterized in that, Each of the square pins has a surrounding chamfered guide structure at the lower end of the insertion part. The chamfered structure eliminates the sharp edge of the square pin end, realizes automatic alignment guidance during insertion, and avoids scratching the base spring.

6. A pin connector for a PLC module base unit according to claim 3, characterized in that, The cable outlet (14) is provided with a positioning groove, and the plug-in connector (13) is assembled in the positioning groove so that it cannot rotate; the upper part of the cable outlet (14) is provided with a cable outlet through hole, and the signal line (11) passes through the cable outlet through hole; the inside of the cable outlet (14) is provided with a limiting slot, and the cable outlet (14) is assembled and fixed on the insulating shell (1), which can tighten the insulating shell (1) and stabilize the overall size.

7. A pin connector for a PLC module base unit according to claim 1, characterized in that, The reset spring (5) is a compression spring. Multiple sets of the reset springs (5) are evenly distributed below both ends of the pressure plate (7). When the adjusting screw (9) is loosened and retracted, the reset spring (5) continuously provides an upward pushing force, driving the pressure plate (7) to automatically reset and lift.

8. A pin connector for a PLC module base unit according to claim 1, characterized in that, It is also provided with a protective cover plate (10), which is rotatably installed on the top of the insulating shell (1) and completely covers the operating end of the adjusting screw (9) to block dust and debris from entering the locking mechanism, and at the same time prevent accidental unlocking caused by accidentally tightening the screw on site.

9. A pin connector for a PLC module base unit according to claim 1, characterized in that, A positioning step is provided between the nut seat (4) and the inner wall of the insulating shell (1) to achieve quick alignment during assembly. The glue injection hole is opened on the top of the nut seat (4). The glue fills the gap between the nut seat (4), the insulating shell (1) and the integrated pin assembly, and forms an integrated shock-resistant structure after curing.

10. A pin connector for a PLC module base unit according to claim 1, characterized in that, When the adjusting screw (9) is turned downwards, it can drive the pressure plate (7) to press down and press the spring of the base unit, so that the pin connector can be pulled out from the base unit; after the adjusting screw (9) is loosened, the reset spring (5) pushes the pressure plate (7) upwards to automatically reset.

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