Space-adjustable flexible resistor chain

Abstract

The utility model relates to a resistor chain, in particular to a space-adjustable flexible resistor chain, and aims to solve the technical problem that an external resistor chain of a middle storage switch is easy to shift and contact a peripheral pull rod of the middle storage switch to cause surface flashover. The utility model comprises n resistors, (n + 1) locking units and (n-1) sleeves, wherein n is an integer and is not less than 2; the n resistors are sequentially connected through the n-1 locking units and the n-1 sleeves to form a resistor assembly, and the two ends of the resistor assembly are connected with the supporting column balls through the locking units respectively. The locking unit comprises a female joint, a locking nut, a joint ball and a joint rod; the joint ball is fixedly connected with one end of the joint rod; one end of the female joint and the joint ball form a universal joint structure through a locking nut, and the other end of the female joint is connected to one end of a resistor in a sleeved mode. The other end of the joint rod located between every two adjacent resistors is fixedly connected with one end of the other resistor through a sleeve, and the other ends of the two joint rods located at the two ends of the resistor assembly are directly and fixedly connected with the supporting column ball.

Description

TECHNICAL FIELD

[0001] The utility model relates to a resistance chain, specifically relates to a space adjustable flexible resistance chain. BACKGROUND

[0002] In the technical field of high-altitude electromagnetic pulse environment simulation generation, the driving source of the megavolt high-altitude electromagnetic pulse simulation device generally adopts a two-stage pulse compression technical scheme, the pulse voltage generated by the primary pulse source is fed to a radiation antenna after two pulse compression links, and a standard pulse electric field waveform is formed in a radiation space. The intermediate energy storage capacitor and the intermediate energy storage switch (hereinafter referred to as the intermediate storage switch) jointly constitute the first-stage pulse compression link. The intermediate storage switch, as a key component, directly affects the formation of the pulse electric field waveform in terms of breakdown voltage and breakdown stability.

[0003] In order to improve the breakdown stability, the intermediate storage switch usually uses an ultraviolet pre-ionization structure, and the trigger gap is triggered by the external resistance voltage division to obtain a trigger voltage from the main pulse, and the trigger gap breakdown generates ultraviolet light to irradiate the main electrode to accelerate the main gap breakdown. Due to the need for resistance voltage division, several resistance chains with different lengths need to be connected to the periphery of the intermediate storage switch. However, the intermediate storage switch is in the form of a cylinder, and the existing resistance chain adopts a flexible connection structure supplemented by an insulating elastic material tensioning structure. Because the resistance chain has no structural support except the two end support balls, the external resistance chain of the intermediate storage switch is easy to displace and contact the peripheral pull rod of the intermediate storage switch, causing surface flashover. SUMMARY

[0004] The utility model aims at solving the technical problem that the external resistance chain of the intermediate storage switch is easy to displace and contact the peripheral pull rod of the intermediate storage switch, causing surface flashover, and provides a space adjustable flexible resistance chain.

[0005] To achieve the above-mentioned purpose, the utility model adopts the technical scheme that:

[0006] A space adjustable flexible resistance chain, characterized in that:

[0007] It comprises n resistors, n+1 locking units and n-1 sleeves, where n is an integer and n≥2;

[0008] The n resistors are connected in sequence to form a resistance assembly through n-1 locking units and n-1 sleeves, and the two ends of the resistance assembly are connected to a support ball through one locking unit respectively, and the two support balls are used to connect with the intermediate storage switch;

[0009] The locking unit comprises a female joint, a locking nut, a joint ball and a joint rod;

[0010] The joint ball is fixedly connected to one end of the joint rod;

[0011] One end of the female joint is connected with the joint ball through a locking nut to form a universal joint structure, and the other end of the female joint is sleeved on one end of a resistor;

[0012] The other end of the joint rod of the locking unit between the two adjacent resistors is fixedly connected with the other end of the other resistor through a sleeve, and the other end of the joint rod in the two locking units at the two ends of the resistor assembly is directly fixedly connected with the support ball.

[0013] Further, a spherical socket is arranged on the end face of the female joint away from the one end of the resistor, and a part of the joint ball is rotatably arranged in the spherical socket;

[0014] An external thread is arranged on the outer periphery of the female joint away from the one end of the resistor, the locking nut is threadedly connected with the female joint, and the locking nut is sleeved outside the joint ball;

[0015] The locking unit further comprises a clamp, the clamp is arranged in the inner hole of the end of the locking nut away from the female joint, and the clamp is sleeved outside the joint ball, the inner diameter of the clamp is smaller than the diameter of the joint ball, a protrusion is arranged on the outer peripheral surface of the clamp, a boss is arranged on the wall surface of the inner hole of the end of the locking nut away from the female joint, the boss is located on the side of the protrusion away from the female joint, and the boss extrudes the protrusion to press the outer surface of the joint ball, so that the joint ball is tightly fixed in the spherical socket.

[0016] Further, the clamp has a notch in the circumferential direction;

[0017] The radially inner side surface of the clamp is a spherical surface, and the spherical surface is in surface contact with the outer surface of the joint ball.

[0018] Further, the joint ball and the joint rod are an integral piece, and the sleeve and the joint rod connected therewith are an integral piece;

[0019] The distance between the two ends of the clamp at the notch is greater than the diameter of the joint rod; the boss is in the form of a ring, and the inner diameter of the boss is greater than the diameter of the joint ball.

[0020] Further, the adjustable range of the included angle between the axis of the female joint and the axis of the joint rod is 0°-60°.

[0021] Further, the outer edge of the locking nut, the outer edge of the female joint, the outer edge of the sleeve, the connection between the joint ball and the joint rod, and the connection between the joint rod and the sleeve are all smoothly transitioned.

[0022] Further, at least one first top pin is arranged on the female joint, and the inner end of each first top pin abuts against the outer periphery of the resistor;

[0023] One end of the sleeve is connected with the joint rod, the other end of the sleeve is sleeved on one end of the resistor, at least one second top pin is arranged on the sleeve, and the inner end of each second top pin abuts against the outer periphery of the resistor.

[0024] Further, the first beryllium copper spring is arranged in the sleeve hole of the female joint sleeve and contacts the surface of the resistance;

[0025] The second beryllium copper spring is arranged in the sleeve hole of the sleeve and contacts the surface of the resistance.

[0026] Further, each support ball comprises a spherical part and a connecting rod part connected to the spherical part at one end, and the other end of the connecting rod part is used for connecting to the intermediate storage switch;

[0027] One or two connecting holes are arranged on the spherical part, and the joint rods of the two locking units arranged at the two ends of the resistance assembly are respectively inserted into the connecting holes on the two support balls;

[0028] The spherical part is provided with at least one third set screw in the circumferential direction of each connecting hole, and the inner end of the third set screw abuts against the outer periphery of the joint rod, so that the joint rod is fixedly connected to the support ball;

[0029] The outer edge of the spherical part and the connection between the spherical part and the connecting rod part are smoothly transitioned.

[0030] Further, the first annular groove is arranged on the inner periphery of the sleeve hole of the female joint, the first beryllium copper spring is arranged in the first annular groove, and the inner periphery of the first beryllium copper spring contacts the outer periphery of the resistance;

[0031] The second annular groove is arranged on the inner periphery of the sleeve hole of the sleeve, the second beryllium copper spring is arranged in the second annular groove, and the inner periphery of the second beryllium copper spring contacts the outer periphery of the resistance;

[0032] The female joint is uniformly provided with four first set screws in the circumferential direction, the sleeve is uniformly provided with four second set screws in the circumferential direction, the spherical part is provided with two coaxial connecting holes, the inner ends of the two connecting holes are communicated with each other, and two third set screws are uniformly arranged in the circumferential direction of each connecting hole.

[0033] Compared with the prior art, the utility model has the beneficial effects that:

[0034] 1、The space-adjustable flexible resistance chain adopts the universal joint structure, realizes flexible adjustment of the resistance chain, improves the space configuration capability of the resistance chain, and guarantees the overall insulation performance of the resistance chain;

[0035] 2、The space-adjustable flexible resistance chain adopts the locking nut locking scheme, adopts the clamp extrusion locking mode, realizes rigid fixation of the resistance chain, improves the assembly reliability of the resistance chain, and improves the stability of the intermediate storage switch;

[0036] 3. The space-adjustable flexible resistance chain has the clamps with the gaps capable of passing through the joint rods, so that the clamps can be quickly fixed through the locking nuts after being placed between the locking nuts and the joint balls, and can also be quickly disassembled, and the number of the resistance series units can be quickly changed through the mode to adjust the resistance chain resistance value to adapt to different requirements.

[0037] 4. The space-adjustable flexible resistance chain has the beryllium copper spring plate structure arranged at the connection positions of the resistances, the female joints and the sleeves to ensure the reliability of the electrical connection.

[0038] 5. The space-adjustable flexible resistance chain uses the jackscrews to complete the connection of the resistances, the female joints and the sleeves, and can optimize the electric field distribution and avoid the problems of loose fixation due to the too short length of the screws and the influence on the electric field distribution due to the too long length of the screws. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 FIG. 1 is a perspective structural schematic view of an embodiment of the space-adjustable flexible resistance chain of the utility model;

[0040] Figure 2 FIG. 2 is an exploded structural schematic view of the embodiment of the space-adjustable flexible resistance chain of the utility model;

[0041] Figure 3 FIG. 3 is a sectional structural schematic view of the embodiment of the space-adjustable flexible resistance chain of the utility model (the first beryllium copper spring plate and the second beryllium copper spring plate are not shown);

[0042] Figure 4 FIG. 4 is a partial enlarged structural schematic view of the embodiment of the space-adjustable flexible resistance chain of the utility model; Figure 3

[0043] Figure 5 FIG. 5 is a sectional structural schematic view of the locking nut in the embodiment of the space-adjustable flexible resistance chain of the utility model;

[0044] Figure 6 FIG. 6 is a structural schematic view of the clamp in the embodiment of the space-adjustable flexible resistance chain of the utility model;

[0045] Figure 7 FIG. 7 is a sectional structural schematic view of B-B in the embodiment of the space-adjustable flexible resistance chain of the utility model. Figure 6 The following is the explanation of the reference signs:

[0046]

[0047] ​​1 - support ball, 11 - spherical part, 111 - connecting hole, 112 - third threaded hole, 12 - connecting rod part, 2 - locking nut, 21 - boss, 3 - clamp, 31 - protrusion, 32 - spherical surface, 33 - notch, 4 - joint ball, 5 - female joint, 51 - ball socket, 52 - first threaded hole, 53 - first annular groove, 6 - resistor, 7 - sleeve, 71 - second threaded hole, 72 - second annular groove, 8 - joint rod, 9 - first beryllium copper spring, 10 - second beryllium copper spring. DETAILED DESCRIPTION

[0048] To make the purpose, advantages and characteristics of the utility model more clear, the following will make further detailed description of the utility model of a kind of space adjustable flexible resistance chain with the drawings and specific embodiment.

[0049] In the description of the utility model, it needs to be explained that the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0050] Referring to Figure 1 And Figure 2 The utility model of a kind of space adjustable flexible resistance chain, including n resistors 6, n+1 locking units and n-1 sleeves 7, wherein n=2, two resistors 6 are connected to form a resistor assembly by 1 locking unit and 1 sleeve 7, the two ends of the resistor assembly are connected with a support ball 1 by 1 locking unit respectively, and two support balls 1 are used to be connected with middle storage switch.

[0051] In other embodiments, the number of resistance series units can be adjusted arbitrarily according to actual needs, for example, n is equal to 3, 4, 5, 6, 7, etc.

[0052] As Figure 1 , Figure 3 And Figure 4 Indicated, locking unit includes female joint 5, locking nut 2, clamp 3, joint ball 4 and joint rod 8, one end of female joint 5 is connected with joint ball 4 through locking nut 2 and clamp 3 to constitute universal joint structure, specifically, the end face of the end of female joint 5 away from resistor 6 is provided with ball socket 51, a part of joint ball 4 is rotatably arranged in ball socket 51, the outer periphery of the end of female joint 5 away from resistor 6 is provided with external thread, locking nut 2 is threadedly connected with female joint 5, and locking nut 2 is sleeved on the outer side of joint ball 4, as Figure 4 , Figure 5 , Figure 6 And Figure 7As shown in the drawings, the clamping hoop 3 is arranged in the inner hole of the lock nut 2 away from the female joint 5, and the clamping hoop 3 is sleeved outside the joint ball 4, the inner diameter of the clamping hoop 3 is smaller than the diameter of the joint ball 4, the inner side surface of the clamping hoop 3 is a spherical surface 32, the spherical surface 32 is in surface contact with the outer surface of the joint ball 4, the outer peripheral surface of the clamping hoop 3 is provided with a protrusion 31, the wall surface of the inner hole of the lock nut 2 away from the female joint 5 is provided with a boss 21, the boss 21 is annular, the inner diameter of the boss 21 is larger than the diameter of the joint ball 4, the boss 21 is located away from the female joint 5 on the side of the protrusion 31, the joint ball 4 is fixedly connected with one end of the joint rod 8, and the joint ball 4 and the joint rod 8 are an integral piece, the adjustable range of the included angle between the axis of the female joint 5 and the axis of the joint rod 8 is 0°-60°, the clamping hoop 3 has a notch 33 in the circumferential direction, the distance between the two ends of the clamping hoop 3 at the notch 33 is greater than the diameter of the joint rod 8, and after the joint ball 4 is arranged in the lock nut 2, the clamping hoop 3 can be arranged between the lock nut 2 and the joint ball 4 through the notch 33.

[0053] When the included angle between the axis of the female joint 5 and the axis of the joint rod 8 is locked, the lock nut 2 is tightened, the lock nut 2 is extruded with the clamping hoop 3 through thread cooperation, the boss 21 extrudes the protrusion 31 to make the spherical surface 32 of the clamping hoop 3 press the outer surface of the joint ball 4, and then the joint ball 4 is tightly fixed in the ball socket 51. When it is necessary to adjust the included angle between the axis of the female joint 5 and the axis of the joint rod 8, the lock nut 2 is loosened, the boss 21 no longer extrudes the protrusion 31 through thread cooperation, and then the included angle between the axis of the female joint 5 and the axis of the joint rod 8 can be adjusted according to the requirement, and then the lock nut 2 is tightened again to fix the joint ball 4 with the adjusted angle, to provide rigid support for the resistance chain and fix the spatial position thereof. The inner diameter of the boss 21 is larger than the diameter of the joint ball 4, so that the joint ball 4 can be conveniently arranged. The clamping hoop 3 is provided with the notch 33, so that the contact position of the clamping hoop 3 and the joint ball 4 can be naturally adjusted when the lock nut 2 is tightened, the friction between the clamping hoop 3 and the joint ball 4 is increased, and the fixed connection rigidity of the joint ball 4 is improved.

[0054] As shown in the drawings, Figure 1 , Figure 3 and Figure 4 , the other end of the female joint 5 is sleeved on one end of a resistance 6, the first beryllium copper spring 9 is arranged in the sleeve hole of the female joint 5, specifically, the inner periphery of the sleeve hole of the female joint 5 is provided with a first annular groove 53, the first beryllium copper spring 9 is arranged in the first annular groove 53, and the inner periphery of the first beryllium copper spring 9 is in contact with the outer periphery of the resistance 6. The first beryllium copper spring 9 is arranged at the connection between the female joint 5 and the resistance 6, so that the electrical connection reliability can be ensured; the female joint 5 is provided with four first threaded holes 52 which are uniformly distributed in the circumferential direction of the one end of the sleeve hole, one first top pin is arranged in each first threaded hole 52, and the inner end of each first top pin is abutted against the outer periphery of the resistance 6.

[0055] As shown in the drawings,Figure 1 , Figure 4 As shown, the female joint 5 of the locking unit located between the two resistors 6 is connected to one end of one resistor 6; the other end of the joint rod 8 of the locking unit located between the two resistors 6 is fixed to one end of the other resistor 6 through a sleeve 7. One end of the sleeve 7 is connected to the joint rod 8, and the sleeve 7 and the joint rod 8 connected to it are integral parts. The other end of the sleeve 7 is sleeved on one end of the resistor 6. A second beryllium copper spring 10 is installed in the sleeve hole of the sleeve 7 where it is sleeved on the resistor 6. Specifically, the sleeve hole on the sleeve 7... A second annular groove 72 is provided on the inner circumference of the sleeve 7, and a second beryllium copper spring 10 is installed in the second annular groove 72. The inner circumference of the second beryllium copper spring 10 contacts the outer circumference of the resistor 6. The second beryllium copper spring 10 is provided at the connection between the sleeve 7 and the resistor 6 to ensure the reliability of the electrical connection. The sleeve 7 has four second threads 71 ​​evenly distributed in the circumferential direction at one end of the sleeve hole. Each second thread 71 is provided with a second set screw, and the inner end of each second set screw presses against the outer circumference of the resistor 6.

[0056] This utility model's spatially adjustable flexible resistor chain uses set screws to connect the resistor 6 to the female joint 5 and the sleeve 7, which can optimize the electric field distribution and avoid the problems of loose fixing when the screw length is too short and affecting the electric field distribution when the length is too long.

[0057] like Figure 1 and Figure 3 As shown, each support ball 1 includes a spherical part 11 and a connecting rod part 12 connected to the spherical part 11 at one end. The other end of the connecting rod part 12 is used to connect to the central storage switch. The spherical part 11 is provided with two coaxial connecting holes 111, and the inner ends of the two connecting holes 111 are interconnected. Two third threaded holes 112 are evenly distributed in the circumferential direction of each connecting hole 111, and each third threaded hole 112 is provided with a third set screw.

[0058] like Figure 1 and Figure 3 As shown, the female joints 5 of the two locking units located at both ends of the resistor assembly are respectively connected to the ends of the two resistors 6 that are far apart from each other. The joint rods 8 of the two locking units located at both ends of the resistor assembly are respectively inserted into the connection holes 111 on the two support balls 1. The inner end of the third set screw presses against the outer periphery of the joint rod 8, so that the joint rod 8 is fixedly connected to the support ball 1. Since the support ball 1 is provided with two connection holes 111, when the space-adjustable flexible resistor chain is installed on the central storage switch, it is convenient for two adjacent space-adjustable flexible resistor chains to share one support ball 1. In other embodiments, the spherical part 11 may also be provided with only one connection hole 111.

[0059] like Figure 1As shown, the outer edge of the lock nut 2, the outer edge of the female joint 5, the outer edge of the sleeve 7, the outer edge of the ball 11, the joint between the ball 4 and the joint rod 8, the joint between the ball 11 and the connecting rod 12, and the joint between the joint rod 8 and the sleeve 7 are all smooth transitions. The smooth transitions on the outer surfaces of the components and the joints can avoid the concentration of electric field caused by sharp geometric structures, reduce the local field strength, optimize the electric field distribution, reduce the probability of abnormal discharge, and improve the reliability of the components. The support ball 1, the lock nut 2, the clamp 3, the ball 4, the female joint 5, the sleeve 7, and the joint rod 8 are all made of conductive materials, such as brass, stainless steel, etc. When assembling the space-adjustable flexible resistance chain, the components can be sequentially connected from the support ball 1.

[0060] The space-adjustable flexible resistance chain of the utility model adopts universal joint structure, realizes flexible adjustment of resistance chain, improves the space configuration ability of resistance chain, and guarantees the overall insulation performance of resistance chain. In addition, the space-adjustable flexible resistance chain of the utility model proposes a locking scheme of the lock nut 2, adopts a clamping and extruding locking mode of the clamp 3, realizes rigid fixation of resistance chain, improves the assembly reliability of resistance chain, and improves the stability of the intermediate storage switch. In addition, the space-adjustable flexible resistance chain of the utility model can quickly change the number of resistance series units to adjust the resistance value of the resistance chain to adapt to different requirements, and has the advantages of simple structure, convenient installation, and reliable fixation.

[0061] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the utility model, and not to limit them; although the utility model has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the specific technical solutions recorded in the foregoing examples, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the utility model.

Claims

1. A spatially adjustable flexible resistance chain, characterized in that: comprising n resistors (6), n+1 locking units and n-1 sleeves (7), wherein n is an integer and n≥2; the n resistors (6) are connected in sequence by n-1 locking units and n-1 sleeves (7) to form a resistor assembly, and the two ends of the resistor assembly are connected to a support ball (1) through 1 locking unit respectively, and the two support balls (1) are used to connect to a circuit breaker; the locking unit comprises a female joint (5), a locking nut (2), a joint ball (4) and a joint rod (8); the joint ball (4) is fixedly connected to one end of the joint rod (8); one end of the female joint (5) and the joint ball (4) constitute a universal joint structure through the locking nut (2), and the other end of the female joint (5) is sleeved on one end of a resistor (6); the other end of the joint rod (8) of the locking unit located between two adjacent resistors (6) is fixedly connected to the other end of another resistor (6) through the sleeve (7), and the other end of the joint rod (8) of the two locking units located at the two ends of the resistor assembly is directly fixedly connected to the support ball (1). 2.The spatially adjustable flexible resistance chain according to claim 1, characterized in that: a spherical socket (51) is arranged on the end face of the female joint (5) away from one end of the resistor (6), and a part of the joint ball (4) is rotatably arranged in the spherical socket (51); an external thread is arranged on the outer periphery of the female joint (5) away from one end of the resistor (6), the locking nut (2) is threadedly connected with the female joint (5), and the locking nut (2) is sleeved on the outside of the joint ball (4); the locking unit further comprises a clamp (3), the clamp (3) is arranged in the inner hole of the locking nut (2) away from the female joint (5), and the clamp (3) is sleeved on the outside of the joint ball (4), the inner diameter of the clamp (3) is smaller than the diameter of the joint ball (4), a protrusion (31) is arranged on the outer peripheral surface of the clamp (3), a boss (21) is arranged on the wall surface of the inner hole of the locking nut (2) away from the female joint (5), the boss (21) is located on the side of the protrusion (31) away from the female joint (5), and the boss (21) extrudes the protrusion (31) to press the outer surface of the joint ball (4), so as to fasten the joint ball (4) in the spherical socket (51). 3.The spatially adjustable flexible resistance chain according to claim 2, characterized in that: the clamp (3) has a notch (33) in the circumferential direction; and the radially inner side surface of the clamp (3) is a spherical surface (32) which is in surface contact with the outer surface of the joint ball (4). 4.The spatially adjustable flexible resistance chain according to claim 3, characterized in that: the joint ball (4) and the joint rod (8) are an integral piece, and the sleeve (7) and the joint rod (8) connected thereto are an integral piece; the distance between the two ends of the clamp (3) at the notch (33) is greater than the diameter of the joint rod (8); and the boss (21) is in the shape of a ring, and the inner diameter of the boss (21) is greater than the diameter of the joint ball (4). 5.The spatially adjustable flexible resistance chain according to claim 4, characterized in that: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The adjustable range of the angle between the axis of the female joint (5) and the axis of the joint rod (8) is 0°-60°.

6. The spatially adjustable flexible resistance chain according to claim 4, characterized in that: The outer edge of the locking nut (2), the outer edge of the female joint (5), the outer edge of the sleeve (7), the connection between the joint ball (4) and the joint rod (8), and the connection between the joint rod (8) and the sleeve (7) are all smoothly transitioned.

7. The spatially adjustable flexible resistance chain according to any one of claims 1-6, characterized in that: At least one first jackscrew is provided on the female joint (5), and the inner end of each first jackscrew abuts against the outer periphery of the resistance (6); One end of the sleeve (7) is connected with the joint rod (8), the other end of the sleeve (7) is sleeved on one end of the resistance (6), at least one second jackscrew is provided on the sleeve (7), and the inner end of each second jackscrew abuts against the outer periphery of the resistance (6).

8. The spatially adjustable flexible resistance chain according to claim 7, characterized in that: A first beryllium copper spring (9) is installed in the sleeve hole of the female joint (5) sleeving the resistance (6), and the first beryllium copper spring (9) is in contact with the surface of the resistance (6); A second beryllium copper spring (10) is installed in the sleeve hole of the sleeve (7) sleeving the resistance (6), and the second beryllium copper spring (10) is in contact with the surface of the resistance (6).

9. The spatially adjustable flexible resistance chain according to claim 8, characterized in that: Each of the support balls (1) comprises a spherical part (11) and a connecting rod part (12) connected with the spherical part (11) at one end, and the other end of the connecting rod part (12) is used to be connected with the middle storage switch; One or two connecting holes (111) are provided on the spherical part (11), and the joint rods (8) of the two locking units located at the two ends of the resistance assembly are respectively inserted into the connecting holes (111) on the two support balls (1); At least one third jackscrew is provided on the spherical part (11) in the circumferential direction of each connecting hole (111), and the inner end of the third jackscrew abuts against the outer periphery of the joint rod (8), so that the joint rod (8) is fixedly connected with the support ball (1); The outer edge of the spherical part (11) and the connection between the spherical part (11) and the connecting rod part (12) are all smoothly transitioned.

10. The spatially adjustable flexible resistance chain according to claim 9, characterized in that: A first annular groove (53) is provided on the inner periphery of the sleeve hole on the female joint (5), the first beryllium copper spring (9) is installed in the first annular groove (53), and the inner periphery of the first beryllium copper spring (9) is in contact with the outer periphery of the resistance (6); A second annular groove (72) is provided on the inner periphery of the sleeve hole on the sleeve (7), the second beryllium copper spring (10) is installed in the second annular groove (72), and the inner periphery of the second beryllium copper spring (10) is in contact with the outer periphery of the resistance (6); The mother joint (5) is provided with four first top wires in the circumference; the sleeve (7) is provided with four second top wires in the circumference; the spherical part (11) is provided with two coaxial connecting holes (111), the inner ends of the two connecting holes (111) are communicated with each other, and each connecting hole (111) is provided with two third top wires in the circumference.

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