Wall bushing and processing device

Abstract

The utility model discloses a wall bushing and a processing device, and the wall bushing comprises a hollow insulator which is of a hollow structure with two closed ends in the axial direction; the central guide rod is arranged in the hollow insulator in a penetrating manner; the adjusting part comprises a first end part and a second end part which are oppositely arranged in the axial direction, at least the first end part and the second end part of the adjusting part are fixedly connected with the peripheral surface of the central guide rod, and the adjusting part is subjected to internal tension in the axial direction. According to the design, the problem that the center guide rod droops can be solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power transmission, in particular to a wall bushing and a processing device. BACKGROUND

[0002] Since the axial size of the wall bushing above 400kV is large, and generally arranged horizontally or approximately horizontally, the center conductor of the wall bushing for conducting current will be bent and droop under the action of gravity; at the same time, in order to control the electric field distribution, the diameter of the center conductor is small; and in order to ensure the long-term operation reliability of the wall bushing, sometimes the support insulator in the middle of the wall bushing is cancelled, so that the center conductor is suspended in the middle of the wall bushing, which together increases the possibility of droop of the center conductor in the middle.

[0003] The droop of the center conductor in the middle increases the risk of breakdown of the insulation material in the middle of the wall bushing, and reduces the reliability of the wall bushing, so it is urgent to improve the problem of droop of the center conductor in the middle. CONTENT OF THE UTILITY MODEL

[0004] The present application provides a wall bushing and a processing device, which can improve the problem of droop of the center conductor.

[0005] The first aspect of the embodiment of the present application provides a wall bushing, which comprises: a hollow insulator arranged in an axial direction as a hollow structure with both ends closed; a center conductor arranged in the hollow insulator; and an adjusting member comprising a first end portion and a second end portion arranged oppositely in the axial direction, wherein at least the first end portion and the second end portion of the adjusting member are fixedly connected with the outer surface of the center conductor, and the adjusting member is subjected to internal tension in the axial direction.

[0006] In the above wall bushing, since the adjusting member is subjected to internal tension in the axial direction, the adjusting member will have a tendency of eccentric contraction in the axial direction, thereby driving the center conductor to be eccentrically compressed until the resistance generated by the eccentric compression of the center conductor balances with the residual internal tension of the adjusting member, that is, the pre-tension stress applied to the adjusting member can generate a corresponding eccentric pre-compression stress below the center conductor, which can avoid the droop of the center conductor, so that the setting of the adjusting member of the present application can effectively avoid the droop of the center conductor.

[0007] The entire surface of the adjusting member towards the center conductor is pasted on the center conductor.

[0008] The above setting can ensure the connection strength between the adjusting member and the center conductor, and further ensure the reliability of the connection between the adjusting member and the center conductor.

[0009] The adjusting member is a carbon fiber reinforced composite cloth.

[0010] The adjusting member is made of carbon fiber reinforced composite material, which can ensure the reliability of the adjusting member.

[0011] The first distance is equal to the second distance.

[0012] The adjusting member can transfer force to the central guide in a symmetrical manner relative to the middle part of the central guide, so that the central guide can be prevented or reduced from sagging.

[0013] The first distance and the second distance are less than or equal to the product of the length of the central guide and 0.2.

[0014] The adjusting member can be reliably connected to the central guide, and the central guide and the adjusting member can be prevented from being separated from each other during long-term use.

[0015] The internal tension is equal to FA F D 2 / 4I1, where F = 5ρgL 2 / [384I(D+b)(3 / (25I)-9 / (200I1)), ρ is the linear density of the central guide, g is the acceleration of gravity, L is the length of the central guide, I is the sectional moment of inertia of the central guide, D is the outer diameter of the central guide, b is the thickness of the adjusting member, I1 is the moment of inertia of the composite section formed by the central guide and the adjusting member, A F is the area of the cross section of the adjusting member perpendicular to the axial direction.

[0016] The central guide can be prevented from sagging.

[0017] The second aspect of the embodiments of the present application provides a processing device for processing the wall bushing of any one of the above. The processing device comprises: a first fixing member and a second fixing member arranged at intervals and used for fixing two ends of the central guide, respectively; a first tensioner used for sleeving the central guide and locking the central guide and the adjusting member; a second tensioner used for sleeving the central guide and used for locking the adjusting member; and a driving member used for driving the second tensioner to move away from the first tensioner after the second tensioner and the adjusting member are locked, so that the adjusting member is subjected to the internal tension in the axial direction.

[0018] The wall bushing can be prepared by using the processing device.

[0019] The processing device further comprises at least one set of parallelly arranged screw rods, the screw rods extend along the axial direction, and the first tensioner and the second tensioner are slidably connected by the screw rods; and a force gauge is arranged on the screw rods.

[0020] The use of the screw rods and the force gauge in the above scheme can effectively ensure that the internal tension of the adjusting member in the axial direction reaches the expectation after the adjusting member is fixedly connected with the central guide rod.

[0021] The driving member comprises a nut, the nut is sleeved on the screw rod and located between the first tensioner and the second tensioner.

[0022] The use of the nut in the above scheme can ensure that the second tensioner moves away from the first tensioner stably.

[0023] The first tensioner comprises a first split ring for sleeving on the central guide rod, and a first locking member arranged at an opening of the first split ring for adjusting the opening size of the first split ring to tighten or loosen the first split ring.

[0024] And / or, the second tensioner comprises a second split ring for sleeving on the central guide rod, a second locking member arranged at an opening of the second split ring for adjusting the opening size of the second split ring to tighten or loosen the second split ring, and a clamping plate arranged at the bottom of the outer side of the ring surface of the second split ring away from the first tensioner and connected with the second split ring, a gap for the adjusting member to pass through is formed between the clamping plate and the second split ring in the vertical direction, and the clamping plate is further used for locking the adjusting member in the gap after the adjusting member passes through the gap.

[0025] The first tensioner comprising the first split ring and the first locking member in the above scheme can fasten the central guide rod and the adjusting member by the first tensioner. The second tensioner comprising the second split ring, the second locking member and the clamping plate can reliably and smoothly tension the adjusting member by the second tensioner.

[0026] The beneficial effect is that, in the wall bushing of the present application, the adjusting member is subjected to internal tension in the axial direction, so the adjusting member has a tendency to shrink in the axial direction, thereby driving the central guide rod to be eccentrically compressed until the resistance generated by the eccentric compression of the central guide rod balances with the residual internal tension of the adjusting member, that is, the pre-tension stress applied to the adjusting member can generate a corresponding eccentric pre-compression stress in the lower part of the central guide rod, and the eccentric pre-compression stress can avoid the central guide rod from sagging, so the setting of the adjusting member of the present application can effectively avoid the central guide rod from sagging.

[0027] Meanwhile, the whole surface of the adjusting member towards the center guide rod is pasted on the center guide rod, so that the connecting strength between the adjusting member and the center guide rod is ensured, and the reliability of the connection between the adjusting member and the center guide rod is ensured.

[0028] In addition, the adjusting member is made of carbon fiber reinforced composite material cloth, so that the reliability of the adjusting member is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0030] Figure 1 is a structural schematic diagram of an embodiment of the wall bushing of the present application;

[0031] Figure 2 is Figure 1 is a structural schematic diagram of the adjusting member and the center guide rod in the embodiment;

[0032] Figure 3 is Figure 1 is a cross-sectional schematic diagram of the adjusting member and the center guide rod perpendicular to the axial direction in the embodiment;

[0033] Figure 4 is a bending moment diagram generated inside the center guide rod under the action of gravity;

[0034] Figure 5 is a flow schematic diagram of an embodiment of the preparation method of the wall bushing of the present application;

[0035] Figure 6 is a schematic diagram of the processing device of the present application when processing the wall bushing;

[0036] Figure 7 is Figure 6 is a structural schematic diagram of the first tensioner in the embodiment;

[0037] Figure 8 is Figure 6 is a structural schematic diagram of the second tensioner in the embodiment;

[0038] Figure 9 is a constraint diagram of the center guide rod;

[0039] Figure 10 is a coordinate system established on the ideal axis of the center guide rod;

[0040] Figure 11 is a schematic diagram of the internal bending moment of the composite rod composed of the center guide rod and the adjusting member. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be clearly and completely described in connection with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work are within the scope of protection of the present application.

[0042] It should be noted that the terms "first", "second" in the present application are only used for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but can optionally include steps or units not listed, or can optionally include other steps or units inherent to the process, method, product or device.

[0043] Reference Figures 1 to 3 In an embodiment of the present application, the through-wall bushing 100 includes a hollow insulator 110, a central guide rod 120 and an adjusting member 130.

[0044] The hollow insulator 110 is provided as a hollow structure with both ends closed in the axial direction X, and the central guide rod 120 is arranged through the hollow insulator 110 for conducting current. In an embodiment, the hollow insulator 110 includes a hollow insulator tube 111, a first end flange 112 and a second end flange 113, the central guide rod 120 is arranged through the hollow insulator tube 111 without contact, the first end flange 112 is sleeved on one end of the central guide rod 120 to connect the central guide rod 120 and the hollow insulator tube 111, and the second end flange 113 is fixed on the other end of the central guide rod 120 to connect the central guide rod 120 and the hollow insulator tube 111.

[0045] The adjusting member 130 includes a first end 131 and a second end 132 arranged oppositely in the axial direction X, at least the first end 131 and the second end 132 of the adjusting member 130 are fixedly connected with the outer circumferential surface of the central guide rod 120, and the adjusting member 130 is subjected to internal tension in the axial direction X.

[0046] Specifically, only the first end 131 and the second end 132 of the adjusting member 130 can be fixedly connected with the outer circumferential surface of the central guide rod 120, and other parts of the adjusting member 130 are not fixedly connected with the outer circumferential surface of the central guide rod 120; or the entire adjusting member 130 can be fixedly connected with the outer circumferential surface of the central guide rod 120, that is, the entire surface of the adjusting member 130 facing the central guide rod 120 is fixedly connected with the central guide rod 120, so as to ensure the connection strength between the adjusting member 130 and the central guide rod 120 and avoid peeling of the central guide rod 120 and the adjusting member 130 in the long-term use process.

[0047] In an embodiment, the adjusting member 130 is adhered to the central guide rod 120 by an adhesive such as epoxy resin, so as to realize the fixed connection between the first end 131 and the second end 132 of the adjusting member 130 and the outer circumferential surface of the central guide rod 120; in another embodiment, an auxiliary member such as a tape can be used to fixedly connect the first end 131 and the second end 132 of the adjusting member 130 with the outer circumferential surface of the central guide rod 120.

[0048] In the above-mentioned bushing 100, the adjusting member 130 is subjected to internal tension in the axial direction X, and thus has a tendency to shrink in the axial direction X, so as to drive the central guide rod 120 to be eccentrically compressed until the resistance generated by the eccentric compression of the central guide rod 120 balances the residual internal tension of the adjusting member 130, that is, the pre-tension applied to the adjusting member 130 can generate a corresponding eccentric pre-compression stress in the lower part of the central guide rod 120, which can avoid the sagging of the central guide rod 120. Therefore, the adjusting member 130 can effectively avoid the sagging of the central guide rod 120.

[0049] Continuing to refer to Figure 1 and Figure 2 In an embodiment, the entire surface of the adjusting member 130 facing the central guide rod 120 is adhered to the central guide rod 120 by an adhesive such as epoxy resin, so as to ensure the connection strength between the central guide rod 120 and the adjusting member 130 and avoid peeling of the adjusting member 130 and the central guide rod 120 in the long-term use process.

[0050] The adjusting member 130 can be a tension film or a tension rod. In an embodiment, the adjusting member 130 is a carbon fiber reinforced composite material cloth (CFRP). The carbon fiber reinforced composite material is a composite material formed by taking carbon fiber or carbon fiber fabric as a reinforcing body and taking resin, ceramic, metal, cement, carbon or rubber as a matrix. Among many lightweight materials, the carbon fiber reinforced composite material has relatively high specific strength and specific rigidity, and the lightweight effect is very obvious. Therefore, the adjusting member 130 is made of the carbon fiber reinforced composite material, which can ensure the reliability of the adjusting member 130 and further avoid the sagging of the central guide rod 120.

[0051] With reference to Figure 1 and Figure 2 , the distance between the first end 131 of the adjusting member 130 and the end of the adjacent central guide rod 120 in the axial direction X is defined as the first distance L1, and the distance between the second end 132 of the adjusting member 130 and the end of the adjacent central guide rod 120 in the axial direction X is defined as the second distance L2, and the first distance L1 is equal to the second distance L2. Specifically, the middle part of the central guide rod 120 is the most prone to sagging part, and setting the first distance L1 equal to the second distance L2 can eliminate the bending moment M of the central guide rod 120 under the action of gravity under the action of the adjusting member 130, thereby avoiding or reducing the sagging of the middle part of the central guide rod 120 to the greatest extent. It should be noted that the above-mentioned end of the central guide rod 120 refers to the position of the central guide rod 120 connected with the first end flange 112 and the second end flange 113.

[0052] With reference to Figure 1 and Figure 2 , under the action of gravity, the central guide rod 120 will generate a bending moment M inside the central guide rod 120, which will cause one half of the cross section of the central guide rod 120 to be compressed and the other half to be tensioned. Taking the horizontal axis of the central guide rod 120 as the representative of the central guide rod 120, and setting the bending moment M of the lower part of the central guide rod 120 to be drawn below the central guide rod 120, and the bending moment M of the upper part to be drawn above the central guide rod 120, the bending moment diagram of the central guide rod 120 inside under the action of gravity is obtained as shown in Figure 4 . It can be seen that the bending moment M of the central guide rod 120 is a quadratic curve, the bending moment M of the two ends of the central guide rod 120 is , and the bending moment M of the middle part of the central guide rod 120 is , wherein p is the linear density of the central guide rod 120, which can be obtained according to the product of the area of the normal cross section of the central guide rod 120 and the material density of the central guide rod 120, g is the acceleration of gravity, and L is the length between the two ends of the central guide rod 120.

[0053] With reference to Figure 2 and Figure 4 , in an embodiment, the position P and the position Q where the bending moment M of the central guide rod 120 alternately changes in positive and negative are respectively taken as the starting point and the ending point of the connection between the adjusting member 130 and the central guide rod 120, and according to the calculation of the existing technical specification, the distance between the position P and the end of the adjacent central guide rod 120 and the distance between the position Q and the end of the adjacent central guide rod 120 are both equal to 0.211L (the specific calculation process is: (1 / 2-3 0.5 / 6)L=0.211L), while considering the fixed distance required for the force transmission of the adjusting member 130 itself, in an embodiment, the first distance L1 and the second distance L2 are both set to be equal to 0.2L. It can be understood that the length of the adjusting member 130 is equal to 0.6L at this time.

[0054] In another embodiment, in order to increase the connection strength between the central guide rod 120 and the adjusting member 130 and further ensure the connection reliability between the central guide rod 120 and the adjusting member 130, the first distance L1 and the second distance L2 are set to be in a range less than the product of the length L of the central guide rod 120 and 0.2. In other embodiments, the first distance L1 and the second distance L2 can also be set to be both greater than 0.2L; or the first distance L1 and the second distance L2 can also be set to be not equal, in summary, the first distance L1 and the second distance L2 can be set according to actual requirements, and the present application does not make specific limitations.

[0055] Referring to FIGS. 5 and Figure 6 In an embodiment of the present application, the processing device includes a first fixing member 210 and a second fixing member 220, a first tensioner 250, a second tensioner 260, and a driving member (not shown in the figure), the first fixing member 210 and the second fixing member 220 are arranged at intervals and are respectively used for fixing two end portions of the central guide rod 120; the first tensioner 250 is used for being sleeved on the central guide rod 120 and locking the central guide rod 120 and the adjusting member 130; the second tensioner 260 is used for being sleeved on the central guide rod 120 and being locked with the adjusting member 130; and the driving member is used for driving the second tensioner 260 to move away from the first tensioner 250 after the second tensioner 260 is locked with the adjusting member 130, so that the adjusting member 130 is subjected to internal tension in the axial direction X. The following describes a process of preparing the above-mentioned wall bushing 100 by using the processing device:

[0056] S110: The two end portions of the central guide rod 120 are respectively fixed by the first fixing member 210 and the second fixing member 220.

[0057] Specifically, the first fixing member 210 and the second fixing member 220 are used for fixing the central guide rod 120, and the central guide rod 120 is arranged to be suspended at other portions except the two end portions.

[0058] The first fixing member 210 and the second fixing member 220 can be tools such as bench clamps. In an embodiment, the bottom of at least one of the first fixing member 210 and the second fixing member 220 is provided with a pulley 230, which can slide and release external force applied to the central guide rod 120 in the axial direction X, so as to avoid damage to the central guide rod 120. In an embodiment, the bottom of the first fixing member 210 is provided with a pad 240, and the bottom of the second fixing member 220 is provided with a pulley 230. It can be understood that the pad 240 is arranged to keep the position of the first fixing member 210 unchanged, so as to ensure the stability of the central guide rod 120 during processing, thereby ensuring the processing effect. Of course, in other embodiments, the bottom of the first fixing member 210 and the second fixing member 220 can be provided with pads 240.

[0059] S120: In a state that the adjusting member 130 is subjected to internal tension in the axial direction X of the central guide rod 120, at least the first end portion 131 and the second end portion 132 of the adjusting member 130 are fixed to the outer circumferential surface of the central guide rod 120 along the axial direction X.

[0060] Specifically, after the adjusting member 130 is fixed to the outer circumferential surface of the central guide rod 120, the adjusting member 130 is subjected to internal tension in the axial direction X, and the internal tension can be used to eliminate the sag of the middle portion of the central guide rod 120, so as to slow down or avoid the sag of the central guide rod 120. In the specific process of step S120, the adjusting member 130 is first stretched, and then the adjusting member 130 in the stretched state is fixed to the outer circumferential surface of the central guide rod 120.

[0061] Continue to combine Figure 6 In an embodiment, step S120 includes:

[0062] S121: The first end portion 131 of the adjusting member 130 is adhered to the first position of the central guide rod 120.

[0063] The first end portion 131 of the adjusting member 130 can be adhered to the first position of the central guide rod 120 after an adhesive such as epoxy resin is applied to the first position of the central guide rod 120, or the first end portion 131 of the adjusting member 130 can be adhered to the first position of the central guide rod 120 after an adhesive such as epoxy resin is applied to the first end portion 131 of the adjusting member 130.

[0064] In an embodiment, the distance between the first position of the central guide rod 120 and the adjacent end portion of the central guide rod 120 is about one fifth of the length L of the central guide rod 120, that is, the first distance L1 is about 0.2L.

[0065] S122: fastening the central guide rod 120 and the adjusting member 130 at the first position by using the first tensioner 250.

[0066] Specifically, in order to avoid the adjusting member 130 from being separated from the central guide rod 120 in the subsequent process of tensioning the adjusting member 130, the central guide rod 120 and the adjusting member 130 are fastened at the first position by using the first tensioner 250.

[0067] In an embodiment, at the first position, the first tensioner 250 is sleeved on the outer periphery of the central guide rod 120 and the adjusting member 130, and then the central guide rod 120 and the adjusting member 130 are locked so that the first end portion 131 of the adjusting member 130 will not be separated from the central guide rod 120 no matter how the adjusting member 130 is stretched subsequently.

[0068] Referring to Figure 6 and Figure 7 , in an embodiment, the first tensioner 250 comprises a first open ring 251 and a first locking member 252.

[0069] The first open ring 251 is used to be sleeved on the central guide rod 120; the first locking member 252 is arranged at the opening of the first open ring 251 and is used to adjust the opening size of the first open ring 251 so as to tighten or loosen the first open ring 251, so that when it is necessary to fasten the central guide rod 120 and the adjusting member 130, the first open ring 251 is locked by the first locking member 252. In an embodiment, the first locking member 252 comprises a bolt and a nut. The present application does not limit the specific structure of the first locking member 252 as long as the first locking member 252 can adjust the opening size of the first open ring 251 and lock it.

[0070] S123: at a second position which is spaced from the first position in the axial direction X, tensioning the adjusting member 130 by using the second tensioner 260 until the tension of the second tensioner 260 in the axial direction X is equal to a preset tension value.

[0071] Specifically, the distance between the first position and the second position can be designed according to requirements. At the second position, the adjusting member 130 is tensioned by using the second tensioner 260 so that the adjusting member 130 is in a stretched state, and at the same time, when the tension of the second tensioner 260 in the axial direction X is equal to the preset tension value, the second tensioner 260 is controlled to stop tensioning the adjusting member 130.

[0072] In combination with Figure 6 and Figure 8 , the second tensioner 260 comprises a second open ring 261, a second locking member 262 and a clamping plate 263.

[0073] The second opening ring 261 is used to be sleeved on the central guide rod 120; the second locking member 262 is arranged at the opening of the second opening ring 261, and is used to adjust the opening size of the second opening ring 261, so as to tighten or loosen the second opening ring 261; the clamping plate 263 is arranged at the bottom of the outer side of the annular surface of the second opening ring 261 away from the first tensioner 250, and is connected with the second opening ring 261; a gap (not shown in the figure) for the adjusting member 130 to pass through is formed between the clamping plate 263 and the second opening ring 261 in the vertical direction; the adjusting member 130 can pass through the gap in the vertical direction, and after the adjusting member 130 passes through the gap, the clamping plate 263 is further used to lock the adjusting member 130 in the gap. Further, the bottom of the second opening ring 261 can be provided as a hollow structure, that is, the bottom of the second opening ring 261 is provided with a cavity 2631, so as to reduce the material consumption of the second tensioner 260 while not affecting the passing of the adjusting member 130, and reduce the cost.

[0074] Specifically, in step S123, the second opening ring 261 is sleeved on the central guide rod 120, and the clamping plate 263 is arranged away from the first tensioner 250, then the free end of the adjusting member 130 is led out from the gap between the second opening ring 261 and the central guide rod 120, passes through the gap between the clamping plate 263 and the second opening ring 261 in the vertical direction, and is locked in the gap by the clamping plate 263, and then the second tensioner 260 is driven to move away from the first tensioner 250 until the tension of the second tensioner 260 in the axial direction X is equal to the preset tension value. It can be understood that in the process of moving the second tensioner 260 away from the first tensioner 250, the adjusting member 130 is stretched.

[0075] Wherein, referring to Figure 7 and Figure 8 , the main body of the second opening ring 261 can have the same structure as the first opening ring 251, and the difference is that the bottom of the second opening ring 261 is further connected with a fixed plate (not shown in the figure) arranged correspondingly with the clamping plate 263, so as to lock the adjusting member 130 in the gap between the fixed plate and the clamping plate 263 by the clamping plate 263; the structure of the second locking member 262 can be the same as that of the first locking member 252.

[0076] S124: The adjusting member 130 between the first tensioner 250 and the second tensioner 260 is adhered to the central guide rod 120.

[0077] Specifically, when the tension of the second tensioner 260 in the axial direction X is equal to the preset tension value, the adjusting member 130 between the first tensioner 250 and the second tensioner 260 is adhered to the central guide rod 120 by, for example, an adhesive such as epoxy resin.

[0078] S125: taking the original second position as a new first position, taking a position spaced from the new first position in the axial direction X as a new second position, and returning to perform the step of fastening the central guide rod 120 and the adjusting member 130 at the first position by the first tensioner 250 to the step of pasting the adjusting member 130 between the first tensioner 250 and the second tensioner 260 to the central guide rod 120 until the length of the adjusting member 130 pasted to the central guide rod 120 is equal to the preset length.

[0079] Specifically, the second tensioner 260 is moved from the original second position to the new second position, the first tensioner 250 is moved from the original first position to the original second position (i.e. the new first position), the central guide rod 120 and the adjusting member 130 are locked at the new first position, and after the adjusting member 130 is tensioned at the new second position to meet the requirements, the adjusting member 130 between the new first position and the new second position is pasted to the central guide rod 120, and then the process of steps S122 to S125 is repeated until the length of the adjusting member 130 pasted to the central guide rod 120 is equal to the preset length.

[0080] In an embodiment, when the length of the adjusting member 130 pasted to the central guide rod 120 is equal to the preset length, the part of the adjusting member 130 not pasted to the central guide rod 120 is removed by, for example, shearing. In an embodiment, the length of the adjusting member 130 pasted to the central guide rod 120 is equal to 0.6L.

[0081] The above embodiment can ensure that the internal tension of the adjusting member 130 in the axial direction X is equal everywhere by pasting the adjusting member 130 of the preset length to the central guide rod 120 in a segmented manner, and can also avoid instability of the longer screw rod 280 during the pasting process of the adjusting member 130, thereby preventing damage to the equipment. Of course, in other embodiments, the adjusting member 130 of the preset length can also be pasted to the central guide rod 120 by only one pasting process, in which case it is only necessary to set the distance between the second position and the first position in step S123 to be equal to the preset length.

[0082] In an embodiment, continuing to refer to Figure 6 , step S123 specifically includes:

[0083] S1231: applying an adhesive to the central guide rod 120 between the first position and the second position.

[0084] The adhesive can be an epoxy resin, and the material of the adhesive is not specifically limited in the present application.

[0085] S1232: covering the adhesive with the protective plate 270.

[0086] Specifically, in order to avoid that the adjusting member 130 is prematurely adhered to the center guide rod 120 during the tension adjustment process, the protective plate 270 is used to cover the adhesive.

[0087] In an embodiment, the material of the protective plate 270 is polytetrafluoroethylene. It can be understood that the length of the protective plate 270 in the axial direction X is less than the distance between the first position and the second position.

[0088] S1233: At the second position, the adjusting member 130 is locked with the second tensioner 260 sleeved on the center guide rod 120.

[0089] Specifically, at the second position, the adjusting member 130 is locked with the second tensioner 260 by the clamping plate 263.

[0090] S1234: Drive the second tensioner 260 to move away from the first tensioner 250 until the tension received by the second tensioner 260 in the axial direction X is equal to the preset tension value.

[0091] S1235: Remove the protective plate 270.

[0092] After the protective plate 270 is removed, the adjusting member 130 between the first tensioner 250 and the second tensioner 260 can be adhered to the center guide rod 120, and step S124 can be performed.

[0093] After the protective plate 270 is removed, the protective plate 270 can be soaked in alcohol or other organic solvents to prevent the adhesive from solidifying on the protective plate 270. In addition, the protective plate 270 needs to be dried before being used next time.

[0094] Continuing to refer to Figure 6 In an embodiment, the processing device further comprises at least one set of side-by-side arranged screw rods 280 and force gauges 290. Specifically, the first tensioner 250 and the second tensioner 260 are connected to the screw rods 280 through the at least one set of side-by-side arranged screw rods 280, the screw rods 280 extend along the axial direction X, and the force gauges 290 are arranged on the screw rods 280. At this time, step S1234 comprises: driving the second tensioner 260 to move away from the first tensioner 250 until the sum of the readings of all the force gauges 290 is equal to the preset tension value.

[0095] Specifically, the number of screw rods 280 can be three, four, five or more. In an embodiment, the number of screw rods 280 is four, two screw rods 280 are connected to the first tensioner 250 and the second tensioner 260 on one side of the center guide rod 120, and the other two screw rods 280 are connected to the first tensioner 250 and the second tensioner 260 on the other side of the center guide rod 120.

[0096] Continuously combined Figure 6 、 Figure 7 and Figure 8 In an embodiment, the screw rod 280 is slidably connected with the first open ring 251 and the second open ring 261, specifically, the first open ring 251 and the second open ring 262 are correspondingly provided with through holes 2511, the number of the through holes 2511 on the first open ring 251 and the number of the through holes 2511 on the second open ring 262 are equal to the number of the screw rod 280, and the screw rod 280 is sequentially arranged through the through holes 2511 on the first open ring 251 and the through holes 2511 on the second open ring 262, so as to realize the slidable connection of the screw rod 280 with the first open ring 251 and the second open ring 262.

[0097] Meanwhile, each screw rod 280 is provided with a force sensor 290, and in the process of driving the second tensioner 260 to move away from the first tensioner 250, when the sum of the readings of all the force sensors 290 is equal to a preset tension value, it indicates that the internal tension of the adjusting member 130 between the first position and the second position in the axial direction X reaches the expectation, and thus the driving of the second tensioner 260 to move away from the first tensioner 250 is stopped.

[0098] Continuously referring to Figure 6 In an embodiment, the driving member of the processing device comprises a nut (not shown in the figure), specifically, the screw rod 280 is sleeved with the nut, and the nut is between the first tensioner 250 and the second tensioner 260, and at this time, the step of driving the second tensioner 260 to move away from the first tensioner 250 comprises: rotating the nut to abut the nut against the second tensioner 260; and continuing to rotate the nut to drive the second tensioner 260 to move away from the first tensioner 250.

[0099] Specifically, after rotating the nut to abut the nut against the second tensioner 260, the nut is continuously rotated, and in the process of continuously rotating the nut, the second tensioner 260 will be subjected to a thrust force, so as to move away from the first tensioner 250.

[0100] Continuously referring to Figure 1 In an embodiment, the internal tension T of the adjusting member 130 in the axial direction X is equal to FA F D 2 / 4I1, wherein F=5ρgL 2 / [384I(D+b)(3 / (25I)-9 / (200I1)), ρ is the linear density of the central guide rod 120, g is the acceleration of gravity, L is the length between the two ends of the central guide rod 120, I is the sectional moment of inertia of the central guide rod 120, D is the outer diameter of the central guide rod 120, b is the thickness of the adjusting member 130, I1 is the moment of inertia of the composite section formed by the central guide rod 120 and the adjusting member 130, and A F is the area of the cross section of the adjusting member 130 perpendicular to the axial direction X.

[0101] Specifically, the following estimates the deflection δ of the middle part of the center guide rod without the adjustment member of the application. The deflection δ of the middle part of the center guide rod mainly includes two parts, one part is the deflection caused by gravity, and the other part is the deflection caused by creep under long-term electrification operation.

[0102] First, introduce the deflection caused by gravity:

[0103] Since the center guide rod is a hollow structure, the cross section perpendicular to the axial direction of the center guide rod is a ring-shaped cross section. Define the length between the two ends of the center guide rod as L, the outer diameter as D, the inner diameter as d, and the cross-sectional area of the center guide rod perpendicular to the axial direction as A, then A = π(D 2 -d 2 ) / 4. At the same time, define the Young's modulus of the material used for the center guide rod as E, and the support equipment at both ends of the center guide rod generally does not allow the end of the center guide rod to rotate, so the constraint diagram of the center guide rod is as shown in Figure 9 , wherein one end of the center guide rod is a sliding constraint, and the other end is a fixed constraint. The sliding constraint means that the center guide rod is allowed to slide in the axial direction (hereinafter the axial direction of the center guide rod is set as the horizontal direction), but is not allowed to rotate and move vertically (vertically refers to the direction perpendicular to the horizontal direction).

[0104] As introduced above, refer to Figure 4 , under the action of gravity, a bending moment M will be generated inside the center guide rod 120, which causes one half of the cross section of the center guide rod 120 to be compressed and the other half to be stretched. At the same time, the application believes that the deformation of the center guide rod under the action of gravity is still small compared to its length, which can be considered as a small deformation case. At the same time, since the center guide rod is generally made of alloy material, it has good elasticity, and can be considered to still comply with the plane section assumption and linear elasticity assumption when bearing the bending moment, so the following approximate equation can be used:

[0105] к≈w (2) =-M / EI

[0106] Wherein, κ is the curvature of the deformed center guide rod, w is the sag (i.e. deflection) of a point on the center guide rod in the vertical direction relative to its ideal axis (a straight line passing through the two ends of the center guide rod), w is a function of the coordinate along the axial direction of the center guide rod; w (1) is the first derivative of w with respect to the coordinate along the axial direction, that is, the cross section rotation angle; w (2) is the second derivative of w with respect to the coordinate along the axial direction. At the same time, in the above formula, the bending moment M drawn below the center guide rod is positive. I is the moment of inertia of the cross section of the center guide rod about the horizontal axis passing through the centroid of the plane, for the ring-shaped cross section of the center guide rod, I = (1-a 4 )πD 4 / 64, where a = d / D.

[0107] At the same time, a coordinate system as shown in Figure 10 is established on the ideal axis of the central guide rod.

[0108] Finally, according to the boundary conditions and related equations, w (2) = ρg[–L 2 / 24 + 0.5(x–0.5L) 2 ] / EI, w (1) = ρg[–xL 2 / 24 + 0.5(x 3 / 3–0.5Lx 2 +L 2 x / 4)] / EI, w = ρg[–x 2 L 2 / 48 + 0.5(x 4 / 12–Lx 3 / 6 +L 2 x 2 / 8)] / EI. Thus, under the action of gravity, the deflection of the middle part of the central guide rod is ρgL 4 / 384EI.

[0109] The deflection caused by creep of the central guide rod under long-term electrification operation is introduced as follows:

[0110] In the electrification process, the central guide rod generates heat due to its own resistance, and the metal will creep and generate additional plastic strain in the long-term heating and stress process, which will gradually increase the sag of the central guide rod over time. The material commonly used for the central guide rod is aluminum alloy. According to the literature research, the creep of aluminum alloy will first go through the first stage of rapid development; when the operating temperature is higher than 145℃, it will enter the second stage of gradual stability, and the creep strain rate is approximately constant; when the operating temperature is higher than 0.3 times the melting point (168℃ to 198℃), it will enter the third stage of destruction. According to the existing technical specifications, the average operating temperature of the central guide rod should not exceed 130℃, and the maximum temperature should not exceed 140℃. Therefore, the creep of the central guide rod in the second and third stages is not considered in the present application.

[0111] The commonly used material of the central guide rod is generally 6-series aluminum alloy, and its creep formula is approximately: ε c = 9.4852 × 10 -18 σ 5.65 t 0.47344 . Wherein, ε cLet σ be the creep strain, dimensionless; σ be the axial stress of the central guide rod, measured in MPa; and t be the duration of high temperature, measured in hours. It is important to note that although the central guide rod is subjected to axial and shear stresses under gravity, the deformation caused by shear stress in thin-walled members with L > 8D is far lower than the deformation caused by axial stress. Therefore, the creep caused by shear stress can be neglected. The service life of a typical through-wall sleeve is 30 years. For a central guide rod with L = 10000 mm, D = 120 mm, and d = 100 mm, its maximum axial stress is 10.5 MPa. Based on the formula, the creep strain over its service life is calculated to be 2.05 × 10⁻⁶ MPa. -9 The deflection caused by creep under long-term energized operation of the central guide rod can be disregarded for general through-wall bushings.

[0112] In summary, the formula for calculating the mid-section deflection δ of the central guide rod is: δ = ρgL 4 / 384EI. For a center guide rod with L = 10000mm, D = 120mm, and d = 100mm, δ = 8.4mm.

[0113] Combination Figure 1 and Figure 6 As shown, when the adjusting member 130 of this application is used to prestress the central guide rod 120, that is, after the adjusting member 130 and the central guide rod 120 are fixedly connected, the non-gravity bending moment generated by the composite rod formed by the central guide rod 120 and the adjusting member 130 is as follows: Figure 11 As shown.

[0114] Figure 11 The bending moment region marked with a "-" is the area where the adjusting component 130 is installed. The area of ​​the cross-section of the adjusting component 130 perpendicular to the axial direction X is A. F The elastic modulus of the adjusting component 130 is E. F The bending moment corresponding to the middle part of the composite bar is M. p The internal pressure is N. Where L1 = L2, and when both are 0.2L, M... P = 2M0 / 5; when both are other lengths, M P =L1M0 / (0.5L), where M0 is the initial bending moment caused by the applied stress (explained in detail below). Since the central guide rod 120 is commonly made of aluminum alloy, and the elastic modulus E of the adjusting component 130... F The material is typically 1 / 3 to 1 / 4 the thickness of aluminum alloy, and the thickness of the adjusting component 130 is relatively small. Therefore, it can be assumed that the centroid of the composite section formed by the central guide rod 120 and the adjusting component 130 changes little, and the moment of inertia of the composite section is I1≈I+E. F D 2 A F(4E) (herein the centroid height of the adjusting member 130 is also ignored, and the centroid of the adjusting member is considered to be close to the bottom surface of the central guide rod 120).

[0115] In the process of manufacturing the through-wall bushing 100, after the second tensioner 260 tension the adjusting member 130 to a stable elongation of the adjusting member 130 at a tension force F, the adjusting member 130 is adhered to the outer circumferential surface of the central guide rod 120, at this time the tension force F is borne by the second tensioner 260, N = 0, M P = 0. After the second tensioner 260 is removed, the tension force of the adjusting member 130 is transferred to the central guide rod 120, and both of them bear force together to reach deformation coordination, and the adjusting member 130 and the central guide rod 120 can be considered as a composite section that bears force together, at this time the actual tension force of the composite section is F, and after the entire processing device is removed, the internal tension of the adjusting member 130 in the axial direction X is T, according to the balance condition, the initial bending moment M0 caused by the external stress is F(D+b) / 2, and M P = F(D+b) / 5, thus in the middle part of the central guide rod 120, at a position that is greater than 0.2L from the end of the central guide rod 120, T / A F = F(D+b) 2 / (4I1)≈FD 2 / (4I1), T = FA F D 2 / (4I1).

[0116] Meanwhile, the virtual displacement method is used in the present application to calculate the upward deflection δ P of the central guide rod 120 at the midspan after prestress is applied, and the calculation formula is: δ P = L 2 F(D+b)(3 / 25I-9 / 200I1) / (5E).

[0117] In order to make the upward deflection δ P of the central guide rod 120 at the midspan after prestress is applied to offset the middle deflection δ of the central guide rod 120 under the action of gravity, δ P = δ, F = 5ρgL 2 / [384I(D+b)(3 / (25I)-9 / (200I1)].

[0118] Therefore, by calculating and setting the internal tension T = FA F D 2 / (4I1) of the adjusting member 130 in the axial direction X according to the above-mentioned embodiments, F = 5ρgL 2 / [384I(D+b)(3 / (25I)-9 / (200I1)], the sag of the central guide rod 120 can be effectively avoided.

[0119] In one embodiment, during the process of driving the second tensioner 260 to move away from the first tensioner 250, when the sum of the indications of all the load cells 290 equals F, it indicates that the internal tension T of the adjustment member 130 between the first position and the second position in the axial direction X reaches the expectation, and thus the driving of the second tensioner 260 to move away from the first tensioner 250 is stopped.

[0120] The above merely illustrates the embodiments of the present application, and is not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the content of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A through-wall sleeve, characterized in that, The through-wall sleeve includes: Hollow insulators are hollow structures with closed ends along the axial direction; The central guide rod passes through the hollow insulator; An adjusting member includes a first end and a second end disposed opposite each other in the axial direction, at least the first end and the second end of the adjusting member are fixedly connected to the outer peripheral surface of the central guide rod, and the adjusting member is subjected to internal tension in the axial direction.

2. The through-wall sleeve according to claim 1, characterized in that, The entire surface of the adjusting member facing the central guide rod is adhered to the central guide rod.

3. The through-wall sleeve according to claim 1, characterized in that, The adjusting element is made of carbon fiber reinforced composite fabric.

4. The through-wall sleeve according to claim 1, characterized in that, The distance in the axial direction between the first end of the adjusting member and the end of the adjacent central guide rod is defined as the first distance, and the distance in the axial direction between the second end of the adjusting member and the end of the adjacent central guide rod is defined as the second distance, wherein the first distance is equal to the second distance.

5. The through-wall sleeve according to claim 4, characterized in that, The range of the first distance and the second distance is less than or equal to the product of the length of the central guide rod and 0.

2.

6. The through-wall sleeve according to claim 1, characterized in that, The internal tension is equal to FA. F D 2 / (4I1), Where F = 5ρgL 2 / [384I(D+b)(3 / (25I)-9 / (200I1))], ρ is the linear density of the central guide rod, g is the gravitational acceleration, L is the length of the central guide rod, I is the moment of inertia of the cross section of the central guide rod, D is the outer diameter of the central guide rod, b is the thickness of the adjusting component, I1 is the moment of inertia of the composite cross section formed by the central guide rod and the adjusting component, A F It is the area of ​​the cross-section of the adjusting member perpendicular to the axial direction.

7. A processing apparatus for processing the through-wall sleeve as described in any one of claims 1 to 6, characterized in that, The processing apparatus includes: The first and second fixing members, which are spaced apart, are used to fix the two ends of the central guide rod, respectively. The first tensioner is used to be sleeved on the central guide rod and to lock the central guide rod to the adjusting member; The second tensioner is used to be sleeved on the central guide rod and to be locked with the adjusting member; A driving member is used to drive the second tensioner away from the first tensioner after the second tensioner is locked with the adjusting member, so that the adjusting member is subjected to the internal tension in the axial direction.

8. The processing apparatus according to claim 7, characterized in that, The processing apparatus further includes: At least one set of screws arranged side by side, the screws extending along the axial direction, and the first tensioner and the second tensioner being slidably connected through the screws; A force gauge is mounted on the screw.

9. The processing apparatus according to claim 8, characterized in that, The driving component includes a nut, which is sleeved on the screw and located between the first tensioner and the second tensioner.

10. The processing apparatus according to claim 7, characterized in that, The first tensioner includes: The first open ring is used to be fitted onto the central guide rod; A first locking element is disposed at the opening of the first open ring and is used to adjust the opening size of the first open ring to tighten or loosen the first open ring. And / or, the second tensioner includes: The second open ring is used to be fitted onto the central guide rod; The second locking element is disposed at the opening of the second open ring and is used to adjust the opening size of the second open ring to tighten or loosen the second open ring; A clamping plate is disposed at the bottom of the second open ring away from the outer side of the first tensioner and connected to the second open ring. A gap is formed between the clamping plate and the second open ring in the vertical direction for the adjusting member to pass through. After the adjusting member passes through the gap, the clamping plate is further used to lock the adjusting member in the gap.

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