Design method of walking stick type low-voltage quick connection terminal

Abstract

The invention relates to the technical field of cable joints, and discloses a design method of a walking stick type low-voltage quick connection terminal, which comprises the steps of terminal cable weight analysis, structural size design, stress analysis, finite element analysis, design structure obtaining and the like. The walking stick type low-voltage quick connection terminal structure designed based on the walking stick type low-voltage quick connection terminal design method comprises a flange connecting base installed in a low-voltage cabinet, a terminal cable and a U-shaped intermediate joint. And the flange connecting seat, the middle joint and the connector clip outside the middle joint and the terminal cable end form an integral crutch type low-voltage quick connection terminal. When the low-voltage equipment is connected with the terminal cable, an operator does not need to climb, and the terminal cable of the low-voltage cabinet can be hooked on the ground by using the insulating operating rod; in addition, the gravity direction of the terminal cable is along the vertical direction of the joint, so that the service life of the joint can be effectively prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of cable joints, and in particular to a design method for a crutch-type low-voltage quick-connect terminal. Background Art

[0002] At present, 0.4kV low-voltage equipment at home and abroad use quick connectors to complete the connection between electrical equipment for the convenience of maintenance or temporary power supply. Conventional low-voltage quick connectors are connected in a direct-acting plug-in connection. The cable plug-in connector of the low-voltage cabinet currently designed is a direct-acting plug-in structure. When the low-voltage cabinet is at a high place, it needs to be manually plugged in and out, which greatly increases the difficulty of docking. At the same time, the weight of the cable makes the connector bear a large horizontal weight load, which affects the service life of the connector. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a design method for a crutch-type low-voltage quick-connect terminal.

[0004] The technical solution adopted by the present invention is: A design method for a crutch-type low-voltage quick-connect terminal is provided. The design method for the crutch-type low-voltage quick-connect terminal is based on the following crutch-type low-voltage quick-connect terminal structure: The crutch-shaped low-voltage quick-connect terminal comprises a flange connection seat installed in a low-voltage cabinet, a terminal cable 3, and an overall U-shaped intermediate joint; The flange connection seat includes a female seat and a flange shell sleeved outside the female seat, the flange shell is fixedly installed on the low-voltage cabinet, and the female seat is electrically connected to the electrical equipment in the low-voltage cabinet; the intermediate joint is a metal piece bent into a U shape, the middle section of the U-shaped metal piece is wrapped with a terminal insulation layer, one side of the U-shaped metal piece is formed with a male metal plug column, the other side is formed with a female metal slot end, and the outside of the female metal slot end is installed with a first plug-in component; the end of the terminal cable is installed with a second connector that matches the first connector; The intermediate joint is plugged into the metal end of the terminal cable through its female metal slot end, and the plug-in is limited by the second connector that cooperates with the first connector. It is plugged into the female seat of the flange connection seat through the male metal plug column; the flange connection seat, the intermediate joint, and the connectors outside the intermediate joint and the terminal cable end constitute an overall crutch-type low-voltage quick connection terminal.

[0005] The design method of the crutch-type low-voltage quick-connect terminal comprises the following steps: Step 1, terminal cable weight analysis: The length of the terminal cable is between 2 meters and 15 meters, and the cable weighs 3 kg per meter. If the total weight of the terminal cables is calculated by hanging in the air, the overall weight is between 6 kg and 45 kg. Step 2, connection structure design: A flange connection seat is fixedly installed in the low-voltage cabinet, and a U-shaped intermediate joint is connected through the flange connection seat, and the U-shaped intermediate joint is connected to the terminal cable end connector; the U-shaped intermediate joint is used to change the original linear force mode of the terminal connection to a vertical force mode, so that the weight of the terminal cable is transferred to the flange connection seat through the intermediate joint; Step 3, structural dimension design: According to the installation space in the low-voltage cabinet and the weight of the terminal cable, the dimensions of the various components that constitute the crutch-type low-voltage quick-connect terminal, namely the dimensions of the flange connection seat, the intermediate joint and the connector, are designed, and corresponding modeling is performed using 3D software; Step 4, force analysis: Based on the connection structure design and structural dimension design, the stress analysis of each part of the crutch-type low-voltage quick-connect terminal is carried out to find the stress points of the corresponding components and calculate their stress conditions; Step 5, finite element analysis: Import the corresponding modeling of the dimension software into the finite element analysis software, and select the structural materials of the main force-bearing components of the crutch-type low-voltage quick-connect terminal in the finite element analysis software based on the force analysis; Step 6, obtain the design structure: Based on finite element analysis, a stress variation diagram is obtained; the stress variation diagram is used to determine whether the main force-bearing components of the crutch-type low-voltage quick-connect terminal meet actual usage requirements.

[0006] Furthermore, the flange shell of the flange connecting socket includes a sleeve mounted on the outside of the female socket, and a mounting flange base located at the bottom of the sleeve and integrally formed with it; a through hole is provided on the mounting flange base, which is fixedly connected to the low-voltage cabinet by bolts; the female socket is a cylindrical structure that passes through the nylon sleeve and the flange base, and a slot for matching the metal plug column is formed therein, and a wiring connection hole is formed at the bottom to match the electrical equipment in the low-voltage cabinet.

[0007] Furthermore, the first plug-in connector includes a fixing seat and a connecting seat, the fixing seat is fixedly connected to the metal slot end of the female head; the connecting seat is a tubular structure, one end of which is fixedly connected to the fixing seat, a gap space is formed between the inner wall of the connecting seat and the outer wall of the metal slot end of the female head, and a plug-in positioning component is installed on the outside of the connecting seat; the second connector is a cylindrical structure installed on the terminal cable end, which can be inserted into the gap space and positioned by the plug-in positioning component.

[0008] Further, step 4 stress analysis includes the following processes: On the premise that the connector has sufficient connection strength and the intermediate joint has absolute strength, when the terminal cable is hung through the crutch-type low-voltage quick-connect terminal, the center point of the bottom surface of the flange connection seat gives an upward supporting force N to the intermediate joint; the supporting force N is equal to the total gravity G of the intermediate joint and the terminal cable, and the upper side of the flange connection seat at the plug-in position gives the intermediate joint and the terminal cable as a whole a supporting force F to one side, which prevents the cable from overturning, and at the same time, the flange connection seat is subjected to an equal extrusion force F opposite to the supporting force F.

[0009] Furthermore, when the terminal cable is connected through the crutch-type low-voltage quick-connect terminal, the rotation torque at the center point of the bottom surface of the flange connection seat must be balanced; therefore, according to the torque balance, it is obtained that: F×a=G×b Where, F is the extrusion force; a is the vertical distance from the center point of the bottom surface of the flange connection seat to the upper part of the plug-in position of the flange connection seat; G is the weight of the terminal cable; b is the vertical distance from the center point of the bottom surface of the flange connection seat to the center point of the female metal slot end; Calculated based on the maximum terminal cable weight: G=mg=45KG×9.8N / KG=441N In the formula, m is the mass of the terminal cable; g is gravity, which is 9.8N / KG; According to the design dimension of 40mm for the vertical distance a from the center point of the bottom surface of the flange connection seat to the upper part of the plug-in position of the flange connection seat, and 100mm for the vertical distance b from the center point of the bottom surface of the flange connection seat to the center point of the metal slot end of the female head, we can substitute F=1102.5N into the above formula, that is, according to the moment balance analysis, the extrusion pressure on the center point of the bottom surface of the flange connection seat is 1102.5N.

[0010] Furthermore, based on the force analysis in step 4, the extrusion pressure on the center point of the bottom surface of the flange connection seat is 1102.5N. The female seat of the flange connection seat is preset to be made of copper and the flange shell is made of nylon. The load-bearing capacity of the female seat is much stronger than that of the flange shell. When the female seat receives the extrusion force F at the center point of the bottom surface, the weakest part of the entire flange connection seat is the flange shell, and it is at the junction of the sleeve of the flange shell and the flange base.

[0011] Furthermore, it is preset that the female seat of the flange connection seat is made of copper material, and the flange shell is made of nylon material; and the corresponding materials are selected in the finite element analysis software to perform finite element analysis; Based on the strain change diagram, it can be concluded that when the female base of the flange connection seat is made of copper and the flange shell is made of nylon, the maximum stress is 8.4×10 7 N / m 2 , the maximum strain is 0.014N / m 2The deformation of the flange connection seat is very small and meets the requirements. At the same time, based on the strain change diagram, it can be concluded that the weakest point of the flange connection seat is at the junction of the sleeve of the flange shell and the flange base. The result is consistent with the force analysis of the female seat structure.

[0012] Furthermore, the design method of the rod-shaped low-voltage quick-connect terminal also includes a flow-through design; the flow-through design uses a ring-shaped strap contact installed in the slot of the copper female seat, and at the same time, a plurality of strap contacts that can contact the terminal cable end are installed in the female metal slot end of the U-shaped intermediate joint.

[0013] The beneficial effects of the present invention are: The crutch-type low-voltage quick-connect terminal is manufactured by selecting materials through the crutch-type low-voltage quick-connect terminal design method. When connecting the low-voltage equipment with the terminal cable, the operator does not need to climb up, and the terminal cable hanging operation of the low-voltage cabinet can be carried out on the ground with an insulating operating rod, which is convenient and reliable. In addition, after the terminal cable of the low-voltage equipment is transferred through the crutch-type low-voltage quick-connect terminal, the gravity direction of the terminal cable is along the vertical direction of the joint, which can effectively improve the service life of the joint. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0015] Figure 1 It is a schematic diagram of the use state of the crutch-type low-voltage quick-connect terminal of the present invention; Figure 2 It is a schematic diagram of the disassembled structure of the crutch-type low-voltage quick-connect terminal of the present invention; Figure 3 This is a schematic diagram of the internal structure of the flange connection seat of the present invention; Figure 4 It is a schematic diagram of the connection between the first connector and the second connector of the present invention; Figure 5 It is a force analysis diagram of the design method of the crutch type low voltage quick connection terminal of the present invention; Figure 6 A material process diagram is set for the finite element analysis software of the design method of the crutch type low voltage quick connection terminal of the present invention; Figure 7 and Figure 8 It is a finite element analysis process diagram of the design method of the crutch type low voltage quick connection terminal of the present invention; Fig. 9 and Fig.10 It is a strain variation diagram of the flange connection seat of the crutch type low-pressure quick connection terminal design method of the present invention; Markings in the figure: 1. Low-voltage cabinet; 2. Flange connecting socket; 3. Terminal cable; 4. Intermediate joint; 5. Female socket; 6. Flange shell; 7. U-shaped metal part; 8. Terminal insulation layer; 9. Male metal plug post; 10. Female metal slot end; 11. First connector; 12. Second connector; 13. Sleeve; 14. Flange base; 15. Through hole; 16. Connecting hole; 17. First strap contact finger; 18. Second strap contact finger; 19. Fixed socket; 20. Connecting socket; 21. Gap space; 22. Plug-in positioning component. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings of the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without creative work are within the scope of protection of the present invention.

[0017] This embodiment provides a design method for a crutch-type low-voltage quick-connect terminal. The design method for a crutch-type low-voltage quick-connect terminal is based on the following crutch-type low-voltage quick-connect terminal structure: like Figure 1 and Figure 2 As shown, the crutch-type low-voltage quick-connect terminal includes a flange connection seat 2 installed in a low-voltage cabinet 1, a terminal cable 3, and an overall U-shaped intermediate joint 4. Figure 2 and Figure 3 As shown, the flange connection seat 2 includes a female seat 5 and a flange shell 6 sleeved outside the female seat 5, the flange shell 6 is fixedly installed on the low-voltage cabinet 1, and the female seat 5 is electrically connected to the electrical equipment in the low-voltage cabinet 1. Figure 2 and Figure 4 The intermediate connector 4 is a U-shaped metal piece 7, the middle section of which is wrapped with a terminal insulation layer 8, a male metal plug 9 is formed on one side, a female metal slot end 10 is formed on the other side, and a first connector 11 is installed outside the female metal slot end 10. Figure 2 As shown, the end of the terminal cable 3 is equipped with a second connector 12 that matches the first connector 11. The flange connection seat 2, the intermediate joint 4, and the connector outside the intermediate joint 4 and the end of the terminal cable 3 constitute an integral crutch-type low-voltage quick connection terminal.

[0018] Further, such as Figure 3As shown, the flange housing 6 of the flange connection seat 2 in this embodiment includes a sleeve 13 sleeved on the outside of the female seat 5, and a mounting flange base 14 integrally formed with the sleeve 13 at the bottom. The mounting flange base 14 is provided with a through hole 15, which is fixedly connected to the low-voltage cabinet 1 by bolts. The female seat 5 is a cylindrical structure that penetrates the nylon sleeve 13 and the flange base 14, and a slot for matching the metal plug is formed therein, and a wiring connection hole 16 is formed at the bottom to match the electrical equipment in the low-voltage cabinet 1.

[0019] like Figure 4 As shown, the first plug connector in this embodiment includes a fixing seat 19 and a connecting seat 20, the fixing seat 19 is fixedly connected to the female metal slot end 10; the connecting seat 20 is a tubular structure, one end of which is fixedly connected to the fixing seat 19, a gap space 21 is formed between the inner wall of the connecting seat 20 and the outer wall of the female metal slot end 10, and a plug positioning component 22 is installed on the outside of the connecting seat 20. The second connector 12 is a cylindrical structure installed at the end of the terminal cable 3, which can be inserted through the gap space 21 and positioned by the plug positioning component 22.

[0020] like Figure 1 As shown, the crutch-type low-voltage quick-connect terminal changes the original horizontal gravity load of the terminal cable 3 to the vertical direction through the intermediate joint 4, and transmits it to the flange connection seat 2; thereby reducing the joint weight load borne by the cable joint and extending the service life. Based on this principle, the design method of the crutch-type low-voltage quick-connect terminal includes the following steps: Step 1, terminal cable 3 weight analysis: The length of the terminal cable 3 is between 2 meters and 15 meters, and the cable weighs 3 kg per meter. The total weight of the terminal cable 3 is calculated based on the total weight when it is suspended in the air, and the overall weight is between 6 kg and 45 kg.

[0021] Step 2, connection structure design: A flange connection seat 2 is fixedly installed in the low-voltage cabinet 1, and a U-shaped intermediate joint 4 is connected through the flange connection seat 2, and the U-shaped intermediate joint 4 is connected to the end connector of the terminal cable 3; the U-shaped intermediate joint 4 is used to change the original linear force mode of the terminal connection to a vertical force mode, so that the weight of the terminal cable 3 is transferred to the flange connection seat 2 through the intermediate joint 4.

[0022] Step 3, structural dimension design: According to the installation space in the low-voltage cabinet 1 and the weight of the terminal cable 3, the dimensions of the various components constituting the crutch-type low-voltage quick-connect terminal, namely the flange connection seat 2, the intermediate joint 4 and the connector, are designed, and corresponding modeling is performed using three-dimensional software.

[0023] Step 4, force analysis: Based on the connection structure design and structural dimension design, the stress analysis of each part of the crutch-type low-voltage quick-connect terminal is carried out to find the stress points of the corresponding components and calculate their stress conditions.

[0024] Specifically, Figure 5 As shown, under the premise that the connector has sufficient connection strength and the intermediate joint 4 has absolute strength; when the terminal cable 3 is hung through the crutch-type low-voltage quick-connect terminal, the center point of the bottom surface of the flange connection seat 2 gives the intermediate joint 4 an upward supporting force N; the supporting force N is equal to the total gravity G of the intermediate joint 4 and the terminal cable 3, and the upper side of the plug-in position of the flange connection seat 2, that is, Figure 5 At point B, a supporting force F is applied to the middle joint 4 and the terminal cable 3 as a whole to one side, thereby preventing the cable from tipping over. At the same time, the flange connection seat 2 is subjected to an extrusion force F of the same magnitude opposite to the supporting force F.

[0025] Furthermore, when the terminal cable 3 is connected through the crutch-type low-voltage quick-connect terminal, the rotation torque at the center point A of the bottom surface of the flange connection seat 2 must be balanced; therefore, according to the torque balance, it is obtained that: F×a=G×b Wherein, F is the extrusion force; a is the vertical distance from point A, the center of the bottom surface of the flange connection seat 2, to point B, the upper part of the plug-in position of the flange connection seat 2; G is the weight of the terminal cable 3; b is the vertical distance from point A, the center of the bottom surface of the flange connection seat 2, to point C, the center of the female metal slot end 10; Calculated based on the maximum weight of terminal cable 3: G=mg=45KG×9.8N / KG=441N Where, m is the mass of the terminal cable 3; g is gravity, which is 9.8N / KG; According to the design dimension of 40mm for the vertical distance a from the center point A of the bottom surface of the flange connection seat 2 to the upper part of the plug-in position of the flange connection seat 2, and the design dimension of 100mm for the vertical distance b from the center point A of the bottom surface of the flange connection seat 2 to the center point C in the female metal slot end 10, we can substitute them into the above formula and get F=1102.5N, that is, according to the moment balance analysis, the extrusion pressure on the center point of the bottom surface of the flange connection seat 2 is 1102.5N.

[0026] Based on the force analysis in step 4, the extrusion pressure on the center point of the bottom surface of the flange connection seat 2 is 1102.5N. It is preset that the female seat 5 of the flange connection seat 2 is made of copper and the flange shell 6 is made of nylon. The load-bearing capacity of the female seat 5 is much stronger than that of the flange shell 6; when the female seat 5 receives the extrusion force F at the center point of the bottom surface, the weakest part of the entire flange connection seat 2 is the flange shell 6, and at the junction of the sleeve 13 of the flange shell 6 and the flange base 14.

[0027] Step 5, finite element analysis: The corresponding modeling of the dimension software is imported into the finite element analysis software, and based on the force analysis, the structural materials of the main force-bearing components of the crutch-type low-voltage quick-connect terminal are selected in the finite element analysis software.

[0028] Specifically, Figure 6 As shown, the female seat 5 of the flange connection seat 2 is preset to be made of copper, and the flange shell 6 is made of nylon; and the corresponding materials are selected in the finite element analysis software to perform finite element analysis. Figure 7 and Figure 8 As shown, a fixed constraint is applied to the bottom surface of the flange base 14 of the flange housing 6, and at the same time, a force F of 1102.5N is applied to a point B on one side of the upper part of the plug-in position of the flange connection seat 2.

[0029] Step 6, obtain the design structure: Based on finite element analysis, a stress variation diagram is obtained; the stress variation diagram is used to determine whether the main force-bearing components of the crutch-type low-voltage quick-connect terminal meet actual usage requirements.

[0030] Specifically, Fig. 9 and Fig.10 As shown, Fig. 9 and Fig.10 is the strain variation diagram; based on the strain variation diagram, it can be concluded that when the female seat 5 of the flange connection seat 2 is made of copper and the flange shell 6 is made of nylon, the maximum stress is 8.4×10 7 N / m 2 , the maximum strain is 0.014N / m 2 , the deformation of the flange connection seat 2 is very small and meets the requirements; at the same time, based on the strain change diagram, it can be concluded that the weakest part of the flange connection seat 2 is at the junction of the sleeve 13 of the flange shell 6 and the flange base 14, and the result is consistent with the force analysis of the female seat 5 structure.

[0031] After analysis, according to the female base 5 of the flange connection seat 2 is made of copper, the flange shell 6 is made of nylon, and the designed external dimensions are adopted, the flange connection seat 2 will not be deformed, damaged or cracked under the conditions that the terminal cable 3 is 15 meters long and weighs 45KG.

[0032] In addition, in order to achieve stable contact, low contact resistance, high overload current capability, low temperature rise and other effects, the design method of the rod-type low-voltage quick-connect terminal also includes flow-through design; such as Figure 3 and Figure 4 As shown, the through-flow design adopts a first ring-shaped strap contact finger 17 installed in the slot of the copper female socket 5, and two second strap contact fingers 18 capable of contacting the end of the terminal cable 3 are installed in the female metal slot end 10 of the U-shaped intermediate connector 4.

[0033] According to the design method of the above crutch-type low-voltage quick-connect terminal, the crutch-type low-voltage quick-connect terminal is designed, and its use method is as follows: When the low-voltage equipment is connected to the terminal cable 3, first install the flange connection socket 2 on the low-voltage cabinet 1, and connect the electrical equipment in the low-voltage cabinet 1 to the female socket 5 of the flange connection socket 2; then plug the intermediate joint 4 with the metal end of the terminal cable 3 through its female metal slot end 10, and limit the plug-in through the second connector 12 that cooperates with the first connector 11; at this time, the operator does not need to climb up, and connects the first connector 11 of the intermediate joint 4 with the insulating operating rod on the ground, and finally lifts the intermediate joint 4 and the terminal cable 3 by using the insulating operating rod, and plugs the male metal plug 9 of the intermediate joint 4 with the female socket 5 of the flange connection socket 2 to complete the hanging operation of the terminal cable 3 of the low-voltage cabinet 1.

[0034] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A design method for a crutch-type low-voltage quick-connect terminal, characterized in that: The design method of the crutch type low voltage quick connection terminal is based on the following crutch type low voltage quick connection terminal structure: The crutch-type low-voltage quick-connect terminal comprises a flange connection seat installed in a low-voltage cabinet, a terminal cable, and an overall U-shaped intermediate joint; The flange connection seat includes a female seat and a flange shell sleeved outside the female seat, the flange shell is fixedly installed on the low-voltage cabinet, and the female seat is electrically connected to the electrical equipment in the low-voltage cabinet; the intermediate joint is a metal piece bent into a U shape, the middle section of the U-shaped metal piece is wrapped with a terminal insulation layer, one side of the U-shaped metal piece is formed with a male metal plug column, the other side is formed with a female metal slot end, and the outside of the female metal slot end is installed with a first plug-in component; the end of the terminal cable is installed with a second connector that matches the first connector; The intermediate joint is plugged into the metal end of the terminal cable through its female metal slot end, and the plug-in is limited by the second connector that cooperates with the first connector. It is plugged into the female seat of the flange connection seat through the male metal plug column; the flange connection seat, the intermediate joint, and the connectors outside the intermediate joint and the terminal cable end constitute an overall crutch-type low-voltage quick connection terminal.

2. The design method of the crutch-type low-voltage quick-connect terminal according to claim 1 is characterized in that: The design method of the crutch-type low-voltage quick-connect terminal comprises the following steps: Step 1, terminal cable weight analysis: The length of the terminal cable is between 2 meters and 15 meters, and the cable weighs 3 kg per meter. If the total weight of the terminal cables is calculated by hanging in the air, the overall weight is between 6 kg and 45 kg. Step 2, connection structure design: A flange connection seat is fixedly installed in the low-voltage cabinet, and a U-shaped intermediate joint is connected through the flange connection seat, and the U-shaped intermediate joint is connected to the terminal cable end connector; the U-shaped intermediate joint is used to change the original linear force mode of the terminal connection to a vertical force mode, so that the weight of the terminal cable is transferred to the flange connection seat through the intermediate joint; Step 3, structural dimension design: According to the installation space in the low-voltage cabinet and the weight of the terminal cable, the dimensions of the various components that constitute the crutch-type low-voltage quick-connect terminal, namely the dimensions of the flange connection seat, the intermediate joint and the connector, are designed, and corresponding modeling is performed using 3D software; Step 4, force analysis: Based on the connection structure design and structural dimension design, the stress analysis of each part of the crutch-type low-voltage quick-connect terminal is carried out to find the stress points of the corresponding components and calculate their stress conditions; Step 5, finite element analysis: Import the corresponding modeling of the dimension software into the finite element analysis software, and select the structural materials of the main force-bearing components of the crutch-type low-voltage quick-connect terminal in the finite element analysis software based on the force analysis; Step 6, obtain the design structure: Based on finite element analysis, a stress variation diagram is obtained; the stress variation diagram is used to determine whether the main force-bearing components of the crutch-type low-voltage quick-connect terminal meet actual usage requirements.

3. The design method of the crutch-type low-voltage quick-connect terminal according to claim 1 is characterized in that: The flange shell of the flange connecting socket includes a sleeve mounted on the outside of the female socket, and a mounting flange base located at the bottom of the sleeve and integrally formed with the female socket; a through hole is provided on the mounting flange base, which is fixedly connected to the low-voltage cabinet by bolts; the female socket is a cylindrical structure that passes through the nylon sleeve and the flange base, and a slot for matching the metal plug column is formed therein, and a wiring connection hole is formed at the bottom to match the electrical equipment in the low-voltage cabinet.

4. The design method of the crutch-type low-voltage quick-connect terminal according to claim 1 is characterized in that: The first plug-in connector includes a fixing seat and a connecting seat, the fixing seat is fixedly connected to the metal slot end of the female head; the connecting seat is a tubular structure, one end of which is fixedly connected to the fixing seat, a gap space is formed between the inner wall of the connecting seat and the outer wall of the metal slot end of the female head, and a plug-in positioning component is installed on the outside of the connecting seat; the second connector is a cylindrical structure installed on the terminal cable end, which can be inserted into the gap space and positioned by the plug-in positioning component.

5. The design method of the crutch-type low-voltage quick-connect terminal according to claim 2 is characterized in that: Step 4: Force analysis, including the following processes: On the premise that the connector has sufficient connection strength and the intermediate joint has absolute strength, when the terminal cable is hung through the crutch-type low-voltage quick-connect terminal, the center point of the bottom surface of the flange connection seat gives an upward supporting force N to the intermediate joint; the supporting force N is equal to the total gravity G of the intermediate joint and the terminal cable, and the upper side of the flange connection seat at the plug-in position gives the intermediate joint and the terminal cable as a whole a supporting force F to one side, which prevents the cable from overturning, and at the same time, the flange connection seat is subjected to an equal extrusion force F opposite to the supporting force F.

6. The design method of the crutch-type low-voltage quick-connect terminal according to claim 4, characterized in that: When the terminal cable is connected through the crutch-type low-voltage quick-connect terminal, the rotation torque at the center point of the bottom surface of the flange connection seat must be balanced; therefore, according to the torque balance, it is obtained that: F×a=G×b Where, F is the extrusion force; a is the vertical distance from the center point of the bottom surface of the flange connection seat to the upper part of the plug-in position of the flange connection seat; G is the weight of the terminal cable; b is the vertical distance from the center point of the bottom surface of the flange connection seat to the center point of the female metal slot end; Calculated based on the maximum terminal cable weight: G=mg=45KG×9.8N / KG=441N In the formula, m is the mass of the terminal cable; g is gravity, which is 9.8N / KG; According to the design dimension of 40mm for the vertical distance a from the center point of the bottom surface of the flange connection seat to the upper part of the plug-in position of the flange connection seat, and 100mm for the vertical distance b from the center point of the bottom surface of the flange connection seat to the center point of the metal slot end of the female head, we can substitute F=1102.5N into the above formula, that is, according to the moment balance analysis, the extrusion pressure on the center point of the bottom surface of the flange connection seat is 1102.5N.

7. The design method of the crutch-type low-voltage quick-connect terminal according to claim 6, characterized in that: Based on the force analysis in step 4, the extrusion pressure on the center point of the bottom surface of the flange connection seat is 1102.5N. The female seat of the flange connection seat is preset to be made of copper and the flange shell is made of nylon. The load-bearing capacity of the female seat is much stronger than that of the flange shell. When the female seat receives the extrusion pressure F at the center point of the bottom surface, the weakest part of the entire flange connection seat is the flange shell, and it is at the junction of the sleeve of the flange shell and the flange base.

8. The design method of the crutch-type low-voltage quick-connect terminal according to claim 7, characterized in that: The female seat of the preset flange connection seat is made of copper, and the flange shell is made of nylon; and the corresponding materials are selected in the finite element analysis software to perform finite element analysis; Based on the strain change diagram, it can be concluded that when the female base of the flange connection seat is made of copper and the flange shell is made of nylon, the maximum stress is 8.4×10 7 N / m 2 , the maximum strain is 0.014N / m 2 The deformation of the flange connection seat is very small and meets the requirements. At the same time, based on the strain change diagram, it can be concluded that the weakest point of the flange connection seat is at the junction of the sleeve of the flange shell and the flange base. The result is consistent with the force analysis of the female seat structure.

9. The design method of the crutch-shaped low-voltage quick-connect terminal according to claim 2 is characterized in that: The design method of the stick-shaped low-voltage quick-connect terminal also includes a flow-through design; the flow-through design uses a ring-shaped strap contact installed in the slot of the copper female seat, and at the same time, a plurality of strap contacts that can contact the terminal cable end are installed in the female metal slot end of the U-shaped intermediate joint.

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