Crimping-free wiring terminal

Abstract

The invention discloses a crimping-free wiring terminal, and the wiring terminal comprises a terminal which is provided with a terminal tail part; the conductive plug connector is connected with the tail part of the terminal, a plug wire cavity and a connecting cavity are arranged in the conductive plug connector, a step is arranged at the joint of the plug wire cavity and the connecting cavity, and the tail part of the terminal is inserted into the connecting cavity and abuts against the step; the wire pressing part is arranged in the wire inserting cavity and is used for extruding and locking the inserted wire; the positioning pin penetrates through the wall of the connecting cavity and the wall of the accommodating cavity at the tail part of the terminal to connect the conductive plug connector with the tail part of the terminal; and the pressure sensor is arranged on the positioning pin and is used for detecting the depth of a wire inserted into the conductive plug connector and outputting a corresponding electric signal. The pressure sensor is arranged in the positioning pin, when the end of the wire is in contact with the sensor, the resistance of the metal strain gauge changes, and therefore whether the wire is inserted into the effective position of the bottommost end of the terminal or not is measured, and accurate monitoring of the insertion depth of the wire is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of power transmission and distribution equipment, and in particular to a crimp-free terminal. Background Art

[0002] In the current field of electrical connection technology, the quality of the connection between the wire and the terminal connector is directly related to the stability and safety of the power system. Specifically, the depth of the wire inserted into the terminal connector is a key factor affecting the contact area between the bare wire (i.e., the exposed part of the wire) and the conductive medium inside the connector. The size of this contact area directly determines the flow area during current transmission, which in turn has a significant impact on the current passing capacity. When the wire is not inserted enough, resulting in a reduction in contact area, it will cause an increase in local resistance, which will lead to an increase in temperature at the wire head. In severe cases, it may induce overheating and even fire risks, posing a major threat to the safe operation of the electrical system.

[0003] The existing crimp-free terminal technology has a significant defect in actual operation: due to the closed internal structure of the connector, the operator cannot visually judge whether the wire has been fully inserted to the bottom of the connector when inserting the wire into the connector. This visual "blind spot" increases the uncertainty of operation, especially in complex or restricted working environments. The operator may misjudge or the wire is accidentally blocked inside the connector (such as encountering internal foreign matter, structural deformation, etc.). Although the operator subjectively feels that he has inserted it to the end with force, in fact, the wire has not reached the expected insertion depth. This situation directly leads to a reduction in the effective contact area between the bare wire and the conductive medium in the connector, thereby reducing the current transmission efficiency and increasing the resistance thermal effect, which buries potential safety hazards for the electrical system. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a crimp-free terminal to ensure that the wire is accurately and reliably inserted into the bottom of the terminal connector, while facilitating an operator to intuitively confirm the insertion status.

[0005] In order to solve the above technical problems, the present invention provides a crimp-free terminal block, comprising:

[0006] a terminal having a terminal tail;

[0007] A conductive plug connector is connected to the tail of the terminal, and is provided with a wire insertion cavity and a connection cavity inside. A step is provided at the connection between the two, and the tail of the terminal is inserted into the connection cavity and abuts against the step;

[0008] A wire pressing part, arranged in the wire insertion cavity, for pressing and locking the inserted wire;

[0009] A positioning pin passes through the connection cavity wall and the accommodating cavity wall of the terminal tail to connect the conductive plug-in component and the terminal tail;

[0010] The pressure sensor is arranged on the positioning pin and is used to detect the depth of the wire inserted into the conductive connector and output a corresponding electrical signal.

[0011] Preferably, a cavity is provided in the center of the positioning pin for accommodating the pressure sensor; and both sides of the positioning pin are hollow tubes with a shielding layer and an insulating layer provided therein.

[0012] Preferably, the wire pressing portion is formed by a plurality of trapezoidal pressing sheets enclosed to form a truncated cone, a wire passing cavity for the wire is formed between the center of the upper bottom surface and the lower bottom surface of the truncated cone, and a plurality of trapezoidal pressing sheets at one end of the upper bottom surface shrink or rebound radially toward the central axis of the wire passing cavity.

[0013] Preferably, the overlapping portion where the terminal tail is plugged into the conductive connector is provided with positioning holes symmetrically about the central axis of the accommodating cavity, and cooperates with the positioning pin to pass through the connecting cavity wall and the accommodating cavity wall.

[0014] Preferably, a first insulating connection sleeve is provided at the connection between the terminal tail and the conductive connector and outside the conductive connector.

[0015] Preferably, at one end close to the wire insertion port, a second insulating connecting sleeve is axially installed to prevent the cable from loosening, and the opening end of the second insulating connecting sleeve is circumferentially provided with a folding plate extending radially toward the center.

[0016] Preferably, an electric control board and a coil are arranged in the area between the opening of the second insulating connecting sleeve and the wire insertion port, close to the wire insertion port.

[0017] Preferably, the first insulating connecting sleeve is provided with a first through hole at a position corresponding to the positioning pin for leading out the wire connected to the pressure sensor, and the second insulating connecting sleeve is provided with a second through hole for introducing the wire of the pressure sensor and connecting it to the electric control board.

[0018] Preferably, a single-chip microcomputer, a power module and a wireless module are arranged on the electronic control board, the output end of the pressure sensor is connected to the first input end of the single-chip microcomputer, the output end of the coil is connected to the input end of the power module, the wireless module is connected to the first output end of the single-chip microcomputer, and the output end of the power module is connected to the second input end of the single-chip microcomputer.

[0019] Preferably, a third insulating sleeve is arranged outside the first insulating sleeve for fixing the wire extending from the hollow tube to the conductive connector, and the wire extending from the hollow tube to the conductive connector is buried in the wall of the second insulating connecting sleeve.

[0020] The implementation of the present invention has the following beneficial effects: The present invention realizes accurate monitoring of the insertion depth of the wire by arranging a pressure sensor in the positioning pin. When the end of the wire touches the pressure sensor, the resistance of the metal strain gauge changes accordingly. This change in the electrical signal directly reflects whether the wire has been accurately inserted into the effective position at the bottom of the terminal, thereby effectively avoiding the problem of insufficient wire insertion caused by visual blind spots or misjudgments of operators, and ensuring the maximum contact area between the wire and the conductive medium. As a result, the resistance generated when current passes through the wire is significantly reduced, the phenomenon of resistance being converted into heat is reduced, and the risk of overheating of the wire head or even causing a fire is avoided. In addition, the present invention also provides intuitive insertion status feedback electronically, which greatly improves the accuracy and safety of the operation, brings an important technological innovation to the field of electrical connection, and effectively ensures the stable operation of the electrical system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 The present invention is a schematic diagram of a cross-sectional structure of a crimp-free terminal block.

[0023] Figure 2 Schematic diagram of the structure of the positioning pin in the embodiment of the present invention.

[0024] Figure 3 It is a schematic diagram of the combination of the pressure measuring circuit and the terminal structure in an embodiment of the present invention.

[0025] Figure 4 Schematic diagram of the pressure measuring circuit in the embodiment of the present invention. DETAILED DESCRIPTION

[0026] The following descriptions of the embodiments are with reference to the accompanying drawings to illustrate specific embodiments in which the present invention can be implemented. In the description of the present invention, it should be understood that the terms "longitudinal", "length", "circumferential", "front", "rear", "left", "right", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0027] Please also refer to Figure 1-3As shown, an embodiment of the present invention provides a crimp-free terminal block, comprising:

[0028] A terminal 1 having a terminal tail 11;

[0029] The conductive plug connector 2 is connected to the terminal tail 11, and is provided with a wire insertion cavity 21 and a connection cavity inside. A step 211 is provided at the connection between the two. The terminal tail 11 is inserted into the connection cavity and abuts against the step 211;

[0030] The wire pressing part 3 is arranged in the wire insertion cavity 21 and is used for pressing and locking the inserted wire 10;

[0031] The positioning pin 213 passes through the connection cavity wall and the accommodating cavity wall of the terminal tail portion 11 to connect the conductive plug-in component 2 and the terminal tail portion 11;

[0032] The pressure sensor 214 is disposed on the positioning pin 213 and is used to detect the insertion depth of the wire 10 into the conductive connector 2 and output a corresponding electrical signal.

[0033] Specifically, in the embodiment of the present invention, the terminal tail 11 has a receiving cavity 22 for receiving an elastic element at one end facing the wire insertion cavity 21, and the receiving cavity 22 is connected to the wire insertion cavity 21. The overlapping portion where the terminal tail 11 and the conductive plug connector 2 are plugged is provided with a positioning hole 212 symmetrically about the central axis of the receiving cavity 22, and a positioning pin 213 is provided to pass through the connecting cavity wall and the receiving cavity wall, so as to connect the conductive plug connector 2 and the terminal tail 11. As an example, the elastic element is specifically a compression spring 24.

[0034] A pressure sensor 214 is arranged at the center of the positioning pin 213. Both sides of the positioning pin 213 are hollow tubes with a shielding layer 215 and an insulating layer 216 inside, so that the lead wire 217 of the pressure sensor 214 can extend out of the conductive connector 2. The pressure sensor 214 is a resistance strain gauge pressure sensor, which is composed of an elastic member and a metal strain gauge.

[0035] The wire insertion cavity 21 is provided with a wire insertion opening 23 at one end away from the terminal tail 11. The inner wall of the wire insertion cavity 21 is a conical side wall, and the wire insertion opening 23 is the reduced diameter end of the wire insertion cavity 21. A conductive wedge-shaped wire pressing portion 3 is provided in the wire insertion cavity 21. The wedge-shaped wire pressing portion 3 is formed into a truncated cone by a plurality of trapezoidal pressing sheets, and a wire passing cavity 31 for the wire is formed between the upper bottom surface and the center of the lower bottom surface of the truncated cone. A plurality of trapezoidal pressing sheets at one end of the upper bottom surface can be radially shrunk or rebounded toward the central axis of the wire passing cavity 31. The side surface of the wedge-shaped wire pressing portion 3 fits with the inner wall of the wire insertion cavity 21. The wedge-shaped wire pressing portion 3 can elastically clamp the wire.

[0036] When connecting the cable 100 to the terminal 1, an insulating wire entry cap 218 is placed on the end of the exposed wire 10 of the cable 100. When the wire 10 with the wire entry cap is inserted into the wire insertion port 23, the wedge-shaped wire pressing part 3 is pushed to move in the direction of the compression spring 24. After being inserted into the top, the wire is moved in the opposite direction to drive the necked end or the upper bottom surface of the wedge-shaped wire pressing part 3 to extend out of the wire insertion port 23. The wire insertion port 23 of the connector limits and squeezes the moving wedge-shaped wire pressing part 3, and the trapezoidal pressing piece of the wedge-shaped wire pressing part 3 squeezes the exposed wire 10, so that the cable 100 can only enter the conductive connector 2 in one direction, and the cable 100 will be locked when it is withdrawn.

[0037] When the insulating wire inlet cap 218 touches the resistance strain gauge pressure sensor on the positioning pin 213, the resistance value of the metal strain gauge pasted on the surface of the elastic part changes accordingly with the strain of the elastic part. By measuring the change in the resistance value of the metal strain gauge, it is determined whether the wire 10 is inserted into the bottom of the conductive connector 2, thereby ensuring that the contact area between the exposed wire 10 and the wedge-shaped wire pressing part 3 is maximized.

[0038] A first insulating connection sleeve 51 is provided at the connection between the terminal tail 11 and the conductive connector 2 and on the outside of the conductive connector 2. At one end close to the wire insertion port 23, a second insulating connection sleeve 52 is installed along the axial direction to prevent the cable 100 from loosening. The open end of the second insulating connection sleeve 52 is designed with a circumferential folding plate 521, which extends radially toward the center, so that the cable 100 can smoothly enter the terminal's wire cavity 31 in one direction, and provide necessary resistance when the cable 100 exits the wire cavity 31. In the area between the opening of the second insulating connection sleeve 52 and the wire insertion port 23, in the cavity except for the wire passing position, an electric control board 40 and a coil 41 are arranged near the wire insertion port 23. The electric control board 40 and the coil 41 can be separated and fixed from the wire passing position by a retaining wall (not shown). A protective circuit and a shielding cover are provided on the electric control board, and the shielding cover is made of soft magnetic alloy material.

[0039] The first insulating connection sleeve 51 is provided with a first through hole at a position corresponding to the positioning pin 213, and the wire connected to the pressure sensor 214 is led out, and introduced into the second through hole 522 provided on the second insulating connection sleeve 52, and connected to the electric control board 40. In this way, the volume of the part of the original terminal connecting the wire can be kept small. In order to fix the lead wire introduced into the second insulating connection sleeve 52 from the positioning pin 214, a third insulating connection sleeve can be provided outside the first insulating connection sleeve 51. The lead wire can also be buried in the wall of the second insulating connection sleeve 52 during production, and one end of the wire can be extended into the body of the positioning pin 213 to connect the lead wire of the pressure sensor 214 through a plug connector, and the other end can be led out from the wall of the second insulating connection sleeve 52 to connect the electric control board 40.

[0040] like Figure 4As shown, a single-chip microcomputer 42, a power module and a wireless module 43 are arranged on the electric control board 40. The principle of electromagnetic induction is used to inductively draw power through a primary current flowing through the terminal contact. The change of the current on and off generates a magnetic field, and the coil draws power through the electromagnetic field generated by the current of the exposed wire in the second insulating connecting sleeve 52. The induced current in the coil charges the power module to provide normal operation of the internal single-chip microcomputer and the wireless module. The pressure sensor 214 is connected to the single-chip microcomputer 42 through a lead, and converts the detected resistance change into an electrical signal. The single-chip microcomputer 42 sends the resistance change electrical signal to the wireless module 43, and the collected resistance change data is transmitted to the mobile phone, handheld detection device or main control background in real time via wireless. When installing or repairing the terminal 1, the wire is inserted into the conductive connector 2, and it can be displayed through the mobile phone software or the handheld detection device to show whether the alarm wire 10 is inserted to the bottom.

[0041] It can be seen from the above description that compared with the prior art, the beneficial effect brought by the embodiment of the present invention is that: the present invention realizes accurate monitoring of the insertion depth of the wire by arranging a pressure sensor in the positioning pin. When the end of the wire touches the pressure sensor, the resistance of the metal strain gauge changes accordingly. This change in the electrical signal directly reflects whether the wire has been accurately inserted into the effective position at the bottom of the terminal, thereby effectively avoiding the problem of insufficient wire insertion caused by visual blind spots or misjudgments of operators, and ensuring the maximum contact area between the wire and the conductive medium. As a result, the resistance generated when the current passes through the wire is significantly reduced, the phenomenon of resistance being converted into heat is reduced, and the risk of overheating of the wire head or even causing a fire is avoided. In addition, the present invention also provides intuitive insertion status feedback electronically, which greatly improves the accuracy and safety of the operation, brings an important technological innovation to the field of electrical connection, and effectively ensures the stable operation of the electrical system.

[0042] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A crimp-free terminal block, characterized in that: include: a terminal having a terminal tail; A conductive plug connector is connected to the tail of the terminal, and is provided with a wire insertion cavity and a connection cavity inside. A step is provided at the connection between the two, and the tail of the terminal is inserted into the connection cavity and abuts against the step; A wire pressing part, arranged in the wire insertion cavity, for pressing and locking the inserted wire; A positioning pin passes through the connection cavity wall and the accommodating cavity wall of the terminal tail to connect the conductive plug-in component and the terminal tail; The pressure sensor is arranged on the positioning pin and is used to detect the depth of the wire inserted into the conductive connector and output a corresponding electrical signal.

2. The crimp-free terminal block according to claim 1, characterized in that: The center part of the positioning pin is provided with a cavity for accommodating the pressure sensor; both sides of the positioning pin are hollow tubes, which are provided with a shielding layer and an insulating layer.

3. The crimp-free terminal block according to claim 1, characterized in that: The wire pressing part is formed by a plurality of trapezoidal pressing sheets enclosed to form a truncated cone, a wire passing cavity is formed between the upper bottom surface and the center of the lower bottom surface of the truncated cone, and a plurality of trapezoidal pressing sheets at one end of the upper bottom surface shrink or rebound radially toward the central axis of the wire passing cavity.

4. The crimp-free terminal block according to claim 1, characterized in that: The overlapping part where the terminal tail is plugged with the conductive plug connector is provided with positioning holes symmetrically with respect to the central axis of the accommodating cavity, and cooperates with the positioning pin to pass through the connecting cavity wall and the accommodating cavity wall.

5. The crimp-free terminal block according to claim 2, characterized in that: A first insulating connection sleeve is provided at the connection between the terminal tail and the conductive plug connector and outside the conductive plug connector.

6. The crimp-free terminal block according to claim 5, characterized in that: At one end close to the wire insertion port, a second insulating connection sleeve is axially installed to prevent the cable from loosening, and a folding plate extending radially toward the center is circumferentially arranged at the open end of the second insulating connection sleeve.

7. The crimp-free terminal block according to claim 6, characterized in that: In the area between the opening of the second insulating connecting sleeve and the wire insertion port, an electric control board and a coil are arranged near the wire insertion port.

8. The crimp-free terminal block according to claim 7, characterized in that: The first insulating connecting sleeve is provided with a first through hole at a position corresponding to the positioning pin for leading out the wire connected to the pressure sensor, and the second insulating connecting sleeve is provided with a second through hole for introducing the wire of the pressure sensor and connecting with the electric control board.

9. The crimp-free terminal block according to claim 8, characterized in that: A single-chip microcomputer, a power module and a wireless module are arranged on the electric control board; the output end of the pressure sensor is connected to the first input end of the single-chip microcomputer, the output end of the coil is connected to the input end of the power module, the wireless module is connected to the first output end of the single-chip microcomputer, and the output end of the power module is connected to the second input end of the single-chip microcomputer.

10. The crimp-free terminal block according to claim 6, characterized in that: A third insulating sleeve is arranged outside the first insulating sleeve for fixing the wire extending from the hollow tube to the conductive connector. The wire extending from the hollow tube to the conductive connector is buried in the wall of the second insulating connecting sleeve.

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