Suspension insulator for power transmission line

Abstract

The invention relates to the technical field of suspension insulators, in particular to a suspension insulator for a power transmission line, which comprises a steel cap, a connecting groove formed in the steel cap, a porcelain insulator arranged at the bottom of the steel cap, and a steel foot arranged at the bottom of the porcelain insulator, the groove is formed in the connecting groove, the steel pin is arranged on the steel foot, the steel pin penetrates through the groove to fix the steel foot in the connecting groove, the steel pin is arranged above the steel foot, and a gap exists between the bottom of the steel foot and the connecting groove. The rotating assembly is arranged on the steel cap, the deflection angle of the insulator is allowed to be increased in a strong wind environment, stress distribution is optimized, the stability of a power transmission line is improved, meanwhile, friction between the steel foot and the steel cap is avoided in the deflection process, the situation that a cement gluing part is damaged due to repeated stress is avoided, and the service life of the insulator is prolonged. Water molecules are prevented from entering the porcelain body to cause a heating phenomenon, and the service life of the steel foot and the steel cap is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of suspension insulators, in particular to a suspension insulator used for a power transmission line. Background Art

[0002] Suspension insulators are a commonly used component in power transmission and distribution lines, mainly composed of insulating parts (such as porcelain, glass or composite materials) and metal accessories (such as steel legs, iron caps, etc.). It forms an insulator string by connecting multiple insulator units in series, which is used to suspend the conductor.

[0003] Suspension insulators include disc suspension insulators and rod suspension insulators. Disc suspension insulators are mostly disc-shaped and widely used in high-voltage overhead transmission lines. They are easy to replace, and a single damaged insulator can be quickly replaced. The mechanical stress is evenly distributed, the conductor swings a large amplitude, has strong adaptability, and has good pollution resistance. Rod-type suspension insulators, on the other hand, have weak radial compressive strength and are easily damaged. They should be avoided from being stepped on or collided with during construction and operation. The sheath material is soft and susceptible to mechanical damage, which affects the sealing and insulation properties. Therefore, in the prior art, the structural design of disc suspension insulators enables them to withstand greater mechanical stress, including the weight of the conductor, wind force, and line tension. At high altitudes in the mountains, the lines will face greater wind deflection and mechanical loads. The high strength and good electromechanical properties of disc insulators make them an ideal choice.

[0004] Disc insulators are divided into three parts, namely porcelain insulators, steel legs and steel caps. By filling cement adhesive between the steel legs and steel caps of the porcelain insulators and the porcelain parts, the steel legs and steel caps are firmly fixed to the upper and lower ends of the porcelain parts. The advantage of this method is that the connection is firm and can effectively transmit mechanical stress. However, in the mud making process of porcelain insulators, steps such as ball milling, screening and mud squeezing need to be strictly controlled to remove large particles and impurities. If these process links are not operated properly, the impurities cannot be completely removed; during the firing process, if the temperature is not properly controlled or the firing time is insufficient, the impurities will not be fully melted or discharged, and thus remain inside the porcelain parts, resulting in impurities and crack defects in the porcelain insulator body.

[0005] In special terrain areas such as valleys and wind vents, wind force is more concentrated and micro-meteorological characteristics are obvious. Under the action of strong winds, the disc insulator string will deviate. During operation, the porcelain insulator not only has to bear the tensile stress caused by the load, but also the vibration load caused by the dancing of the conductor; in the monsoon season, affected by hurricanes, the porcelain insulator will also bear impact loads. During multiple displacements and recovery processes, the cement bonding parts will suffer fatigue damage due to repeated stress. This fatigue accumulation effect will gradually weaken the structural integrity of the cement adhesive, causing the cement bonding parts to easily separate, and water molecules enter the porcelain body through the cracks generated in the cement bonding parts, causing heating; the thermal effect generated by the heating of the porcelain parts will accelerate the expansion of cracks, and the crack defects will significantly reduce the strength of the porcelain insulator. When the load generated by the swing of the porcelain insulator is greater than its residual tensile strength, the glaze of the porcelain part embedded in the steel foot will separate from the disc-type porcelain body as a whole, causing the porcelain insulator to break at the stress concentration position of the neck, causing the conductor or equipment to lose support, and then causing the conductor to fall, short circuit or grounding fault, resulting in power outages in the power system.

[0006] To this end, a suspension insulator for a power transmission line is proposed. Summary of the invention

[0007] The object of the present invention is to provide a suspension insulator for a power transmission line, which can prevent the cement bonding part from being damaged due to repeated stress by arranging a rotating assembly, and can also ensure that the air gap between the conductor and the tower is safe and not affected by strong wind.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A suspension insulator for a power transmission line comprises a steel cap, a connecting groove provided on the steel cap, a porcelain insulator arranged at the bottom of the steel cap, and a steel foot arranged at the bottom of the porcelain insulator. The invention also comprises a groove provided on the connecting groove and a steel pin provided on the steel foot, wherein the steel pin passes through the groove to fix the steel foot in the connecting groove, the steel pin is provided above the steel foot, and there is a gap between the bottom of the steel foot and the connecting groove. A cavity is provided at the upper end of the steel cap, a fixing piece is provided in the cavity, and a rotating assembly is provided on the fixing piece. The rotating assembly is provided between the steel foot and the steel cap, and the rotating assembly can increase the rotation amplitude of the steel foot.

[0010] It can be seen that in the prior art, the upper end of the steel cap of the porcelain insulator is a ball socket, and the lower end of the steel foot is a ball head. When connecting, the ball head is inserted into the ball socket, and then the W-shaped or R-shaped steel pin is inserted and placed at the bottom of the ball head to fix it. The steel pin has high elasticity and toughness. When the steel pin is placed at the bottom of the ball head, the steel pin will squeeze the steel foot so that the steel foot and the steel cap are tightly connected, thereby fixing the ball head to form an insulator string. However, the present invention changes the insertion position of the steel pin so that the steel pin is arranged at the upper end of the ball head. When the porcelain insulator is working, the steel cap will be suspended on the steel foot due to gravity. At this time, the steel pin is tightly fitted with the inner wall of the steel cap, and there is a certain gap between the steel foot and the steel cap. Therefore, when the disc insulator string is offset under the action of strong wind, there will be no direct contact between the steel cap and the steel foot. In addition, by rotating the assembly, the deflection between the steel foot and the steel cap will not cause friction, thereby avoiding repeated stress at the cement bonding part under strong wind conditions to weaken the structural integrity of the cement adhesive.

[0011] Preferably, the rotating assembly includes a clamping block, a movable groove, a ball, a retaining frame and a slide groove, the clamping block is fixed to the upper end of the connecting groove via a fixing piece, the movable groove is provided with multiple groups and is opened on the clamping block, the slide groove is provided with multiple groups and is opened on the inner side of the steel cap, the movable groove and the slide groove correspond one to one, the retaining frame is arranged between the clamping block and the inner wall of the steel cap, the ball is provided with multiple groups and the ball is arranged between the slide groove and the movable groove, the ball is movably connected to the retaining frame, when deflection occurs between the insulators, the retaining frame arranges the ball on the same plane during rotation, the clamping block rotates with the steel foot, and the ball rolls in the movable groove, thereby allowing the steel foot to deflect arbitrarily within the range restricted by the steel cap, increasing the deflection angle of the insulator string, so that in a strong wind environment, increasing the deflection angle can optimize the force distribution of the insulator string, making it more stable under strong wind. This design can effectively reduce the additional bending moment caused by wind deviation, thereby improving the stability of the entire transmission line.

[0012] Preferably, the slide grooves are circumferentially arranged at equal intervals in a specific arc segment of the clamping block, and the central angle of the arc segment is greater than 120°. The arrangement of the slide grooves makes a small area of ​​the clamping block without a ball.

[0013] Preferably, an inner cavity is provided in the connection groove, and the inner cavity is arranged in the middle of the connection groove. The arrangement of the cavity increases the range of movement of the steel foot in the cavity, thereby increasing the deflection angle of the steel foot to improve the anti-wind deflection capability of the insulator string.

[0014] Preferably, the fixing member comprises a connecting rod and a notch, wherein the connecting rod is rotatably connected in the cavity, the notch is provided on the clamping block, and one end of the connecting rod is slidably connected in the notch. The arrangement of the connecting rod and the notch ensures that the clamping block can be deflected while being fixed.

[0015] Preferably, the connecting rod also includes a connecting piece 1, a cross block, and a connecting piece 2. The connecting piece 1 is rotatably connected in the cavity, the cross block is movably connected to the connecting piece 1, the connecting piece 2 is rotatably connected to the cross block, the clamping block and the retaining frame are both fixedly connected to the connecting piece 2, the maximum deflection angle of the steel foot is the distance between the steel foot and the inner edge of the steel cap, when the steel foot is deflected to the inner edge of the steel cap, the steel cap cannot rotate, but the pressure of strong wind continues, and the connecting rod is set to be movable with the cooperation of the connecting piece 1, the cross block and the connecting piece 2, thereby reducing the bending moment force on the connecting rod.

[0016] Preferably, the steel pin is in a "U" shape as a whole, and the edge of the steel foot is provided with a rounded corner, and the radius of the rounded corner is equal to the arc-shaped slope surface on the steel foot. When the steel foot swings, the rounded corner structure on the steel foot fits tightly with the arc-shaped slope surface. This design makes the contact between the two smoother, thereby significantly reducing the friction between the two. In this way, not only the wear caused by friction is reduced, but also the flexibility and stability of the steel foot when swinging are improved, further extending the service life of the component.

[0017] Preferably, the width of the groove is between the width of the end of the steel pin and the width of the middle of the steel pin, the cross-section of the connecting groove is matched with the cross-section of the steel foot, and the steel pin is made of elastic material. After the steel pin enters the connecting groove, the two sides of the steel pin will squeeze the inner wall of the steel cap due to the elastic potential energy, so that the steel pin is fixed in the connecting groove, and because the steel foot will cause the steel pin to be subjected to an upward extrusion force, the steel foot and the steel pin are tightly fitted. When encountering strong winds, the deflection of the steel foot will squeeze the steel pin and cause the steel pin to deform. The side of the steel pin subjected to the extrusion force will be squeezed toward the inner wall of the connecting groove. When encountering strong winds, the greater the wind speed, the greater the force on the side of the steel pin subjected to the extrusion force and the more deformation. Under the action of gravity and tension, when strong winds come, the steel foot fixed by the steel pin is more stable.

[0018] Preferably, the retainer is in an arc shape, and its upper end surface gradually slopes downward from the end to form a slope from high to low. When the retainer deflects following the clamping block, when one end of the retainer deflects upward, it will be hindered due to the height, thereby preventing the steel foot from deflecting to one side.

[0019] Preferably, baffles are respectively arranged above and below the clamping block, and two groups of baffles are fixedly connected to the steel cap. The baffles can prevent the steel foot from deflecting to one side.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The present invention sets a rotating assembly on the steel cap, allowing the insulator to increase the deflection angle in a strong wind environment, optimize the force distribution, reduce the additional bending moment caused by wind deflection, and improve the stability of the transmission line. At the same time, there is no friction between the steel foot and the steel cap during the deflection process, avoiding damage to the cement bonding part due to repeated stress, preventing water molecules from entering the porcelain body to cause heating, and extending the service life of the steel foot and the steel cap. In addition, by adjusting the height of the retaining frame, the steel foot is limited to deflect to one side of the transmission line tower, ensuring that the air gap between the conductor and the pole tower is safe and not affected by strong winds.

[0022] 2. In the prior art, steel pins are usually exposed in the connection grooves. This installation method exposes the steel pins to the environment for a long time, and they are prone to fall off due to degradation of material properties or corrosion. However, this device changes the installation position of the steel pins so that when the steel cap is suspended, the position of the steel pins will move up in the steel cap, so that the grooves on the steel cap and the steel pins are in a staggered position, thereby protecting the steel pins. This design not only effectively avoids the risk of damage to the steel pins due to long-term exposure, but also significantly improves the fixing stability of the steel pins.

[0023] 3. Under normal working conditions, the two sides of the steel pin will squeeze the inner wall of the steel cap inward due to their elastic characteristics, thereby achieving a stable fixation of the steel pin in the connecting groove. At the same time, the steel foot applies an upward squeezing force to the steel pin, so that the steel foot and the steel pin fit tightly together, further enhancing the stability of the connection; when encountering strong winds, the steel foot will deflect, thereby squeezing the steel pin, causing the steel pin to deform elastically. At this time, the side of the steel pin that is subject to the squeezing force will be squeezed toward the inner wall of the connecting groove. As the wind speed increases, the force on the side of the steel pin that is subject to the squeezing force will also increase, and the degree of deformation will also increase accordingly. The stability of the steel foot will increase accordingly with the increase in wind speed. This deformation makes the contact between the steel pin and the inner wall of the steel cap closer, thereby further enhancing the fixing effect of the steel pin in the connecting groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of a suspension insulator for a power transmission line according to the present invention;

[0025] Figure 2 It is a schematic cross-sectional structure diagram of a suspension insulator for a power transmission line according to the present invention;

[0026] Figure 3 It is a schematic plan view of a suspension insulator for a power transmission line according to the present invention;

[0027] Figure 4 It is a schematic diagram of the cross-sectional structure of the insulator connection of the present invention;

[0028] Figure 5 It is a top plan schematic diagram of the rotating assembly of the present invention;

[0029] Figure 6 It is a schematic diagram of the structure of the fixing member of the present invention;

[0030] Figure 7 It is a schematic diagram of the cage structure of the present invention;

[0031] Figure 8 It is a schematic diagram of the connecting rod structure of the present invention;

[0032] Fig. 9 It is a schematic diagram of the steel pin structure of the present invention;

[0033] Fig.10 It is a schematic diagram of the prior art cross-sectional structure of the present invention;

[0034] In the figure: 1. steel cap; 2. connecting groove; 3. porcelain insulator; 4. steel foot; 5. groove; 6. steel pin; 7. cavity; 8. fixing piece; 9. rotating assembly; 91. clamping block; 92. movable groove; 93. ball; 94. retaining frame; 95. slide groove; 21. inner cavity; 81. connecting rod; 82. notch; 811. connecting piece 1; 812. cross block; 813. connecting piece 2; 61. fillet; 41. arc slope; 10. baffle. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in 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. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] See also Figures 1 to 10 The present invention provides a suspension insulator for a power transmission line, and the technical solution is as follows:

[0037] As an embodiment of the present invention, refer to Figures 1 to 4 A suspension insulator for a power transmission line comprises a steel cap 1, a connecting groove 2 provided on the steel cap 1, a porcelain insulator 3 arranged at the bottom of the steel cap 1, and a steel foot 4 arranged at the bottom of the porcelain insulator 3, and further comprises a groove 5 provided on the connecting groove 2, a steel pin 6 provided on the steel foot 4, the steel pin 6 passes through the groove 5 to fix the steel foot 4 in the connecting groove 2, the steel pin 6 is provided above the steel foot 4, and there is a gap between the bottom of the steel foot 4 and the connecting groove 2, a cavity 7 is provided at the upper end of the steel cap 1, a fixing part 8 is provided in the cavity 7, a rotating component 9 is provided on the fixing part 8, the rotating component 9 is provided between the steel foot 4 and the steel cap 1, and the rotating component 9 can increase the rotation amplitude of the steel foot 4.

[0038] It can be seen that in the prior art, the upper end of the steel cap 1 of the porcelain insulator 3 is a ball socket, and the lower end of the steel foot 4 is a ball head. When connecting, the ball head is inserted into the ball socket, and then fixed by inserting a W-shaped or R-shaped steel pin 6 and placing it at the bottom of the ball head. The steel pin 6 has high elasticity and toughness. When the steel pin 6 is placed at the bottom of the ball head, the steel pin 6 will squeeze the steel foot 4 so that the steel foot 4 is tightly connected to the steel cap 1, thereby fixing the ball head to form an insulator string. However, the present invention changes the insertion position of the steel pin 6, so that the steel pin 6 is arranged at the upper end of the ball head. When the porcelain insulator 3 is working, the steel cap 1 will be suspended on the steel foot 4 due to gravity. At this time, the steel pin 6 is tightly fitted with the inner wall of the steel cap 1, and there is a certain gap between the steel foot 4 and the steel cap 1. Therefore, when the disc insulator string is offset under the action of strong wind, there will be no direct contact between the steel cap 1 and the steel foot 4. In addition, the rotating assembly 9 prevents friction from occurring during the deflection between the steel foot 4 and the steel cap 1, thereby preventing repeated stress from being generated at the cement bonding site under strong wind conditions and weakening the structural integrity of the cement adhesive.

[0039] As an embodiment of the present invention, refer to Figures 5 to 7 The rotating assembly 9 includes a clamping block 91, a movable groove 92, a ball 93, a retainer 94 and a slide 95. The clamping block 91 is fixed to the upper end of the connecting groove 2 through a fixing member 8. The movable groove 92 is provided with multiple groups and is opened on the clamping block 91. The slide 95 is provided with multiple groups and is opened on the inner side of the steel cap 1. The movable groove 92 corresponds to the slide 95 one by one. The retainer 94 is arranged between the clamping block 91 and the inner wall of the steel cap 1. The ball 93 is provided with multiple groups and the ball 93 is arranged between the slide 95 and the movable groove 92. The ball 93 is movably connected to the retainer 94. When the insulation When deflection occurs between the insulator and the insulator, the retaining frame 94 sets the ball 93 on the same plane during rotation, and the clamping block 91 rotates with the steel foot 4, and the ball 93 rolls in the movable groove 92, thereby allowing the steel foot 4 to deflect arbitrarily within the range limited by the steel cap 1, increasing the deflection angle of the insulator string. Therefore, in a strong wind environment, increasing the deflection angle can optimize the force distribution of the insulator string, making it more stable under strong wind. This design can effectively reduce the additional bending moment caused by wind deviation, thereby improving the stability of the entire transmission line.

[0040] As an embodiment of the present invention, refer to Figure 5 The slide grooves 95 are circumferentially arranged at equal intervals in a specific arc segment of the clamping block 91, and the central angle of the arc segment is greater than 120°. The arrangement of the slide grooves 95 makes it possible for a small area of ​​the clamping block 91 to not be provided with the ball 93, and the fixing member 8 is arranged on the side of the clamping block 91 where the ball 93 is not provided. When the staff installs the insulator string, the side of the fixing member 8 is installed close to the transmission line tower.

[0041] As an embodiment of the present invention, refer to Figure 2 An inner cavity 21 is also provided in the connecting groove 2, and the inner cavity 21 is arranged in the middle of the connecting groove 2. The arrangement of the cavity 7 increases the range of movement of the steel foot 4 in the cavity 7. When strong winds come, the steel foot 4 deflects, thereby increasing the deflection angle of the steel foot 4 to improve the wind deflection resistance of the insulator string.

[0042] As an embodiment of the present invention, refer to Figure 5 and Figure 6 The fixing member 8 includes a connecting rod 81 and a notch 82. The connecting rod 81 is rotatably connected in the cavity 7. The notch 82 is provided on the clamping block 91. One end of the connecting rod 81 is slidably connected in the notch 82. The arrangement of the connecting rod 81 and the notch 82 ensures that the clamping block 91 can be deflected while being fixed.

[0043] As an embodiment of the present invention, refer to Figure 4 , Figure 6 and Figure 8 The connecting rod 81 also includes a connecting piece 811, a cross block 812, and a connecting piece 813. The connecting piece 811 is rotatably connected in the cavity 7, the cross block 812 is movably connected to the connecting piece 811, the connecting piece 813 is rotatably connected to the cross block 812, the clamping block 91 and the retaining frame 94 are both fixedly connected to the connecting piece 813, and the maximum deflection angle of the steel foot 4 is the distance between the steel foot 4 and the inner edge of the steel cap 1. When the steel foot 4 deflects to the inner edge of the steel cap 1, the steel cap 1 cannot rotate, but the pressure of the strong wind continues, and the connecting piece 811 and the connecting piece 813 can also be bent. Then, the connecting rod 81 is set to be movable under the cooperation of the connecting piece 811, the cross block 812 and the connecting piece 813, thereby reducing the bending moment force on the connecting rod 81.

[0044] As an embodiment of the present invention, refer to Figure 4 and Fig. 9 The steel pin 6 is in a "U" shape as a whole, and the edge of the steel foot 4 is provided with a fillet 61, and the radius of the fillet 61 is equal to the arc slope 41 on the steel foot 4. When the steel foot 4 swings, the fillet 61 structure on the steel foot 4 fits tightly with the arc slope 41. This design makes the contact between the two smoother, thereby significantly reducing the friction between the two. In this way, not only the wear caused by friction is reduced, but also the flexibility and stability of the steel foot 4 when swinging are improved, further extending the service life of the component.

[0045] As an embodiment of the present invention, refer to Figure 1 and Figure 2The width of the groove 5 is between the width of the end of the steel pin 6 and the width of the middle of the steel pin 6. The cross-section of the connecting groove 2 is adapted to the cross-section of the steel foot 4. The steel pin 6 is made of elastic material. After the steel pin 6 enters the connecting groove 2, the two sides of the steel pin 6 will squeeze the inner wall of the steel cap 1 due to the elastic potential energy, so that the steel pin 6 is fixed in the connecting groove 2. Because the steel foot 4 will cause the steel pin 6 to be subjected to an upward extrusion force, the steel foot 4 and the steel pin 6 fit tightly together. When encountering strong winds, the deflection of the steel foot 4 will squeeze the steel pin 6 and cause the steel pin 6 to deform. The side of the steel pin 6 subjected to the extrusion force will be squeezed toward the inner wall of the connecting groove 2. When encountering strong winds, the greater the wind speed, the greater the force on the side of the steel pin 6 subjected to the extrusion force and the more deformation. Under the action of gravity and tension, when strong winds come, the steel foot 4 fixed by the steel pin 6 is more stable.

[0046] As an embodiment of the present invention, refer to Figure 6 and 7 The retaining frame 94 is arc-shaped, and its upper end surface gradually tilts downward from the end to form a slope from high to low. When the retaining frame 94 deflects following the clamping block 91, when the high slope end of the retaining frame 94 deflects upward, it will be hindered due to the height, thereby preventing the steel foot 4 from deflecting to one side.

[0047] As an embodiment of the present invention, refer to Figure 1 Baffles 10 are respectively arranged above and below the clamping block 91, and two sets of baffles 10 are fixedly connected to the steel cap 1. When one end of the high slope of the retaining frame 94 deflects upward, it will be hindered by the baffle 10 due to the height. The baffle 10 can prevent the steel foot 4 from deflecting to one side. However, when the staff installs the insulator string, the side of the fixing part 8 is installed close to the transmission tower. Then, when the direction of the strong wind is perpendicular to the transmission tower, the insulator string will not swing to the side of the transmission tower with the strong wind.

[0048] Working principle: In the prior art, the upper end of the steel cap 1 of the porcelain insulator 3 is a ball socket, and the lower end of the steel foot 4 is a ball head. When connecting, the ball head is inserted into the ball socket, and then fixed by inserting a W-shaped or R-shaped steel pin 6 and placing it at the bottom of the ball head. The steel pin 6 has high elasticity and toughness. When the steel pin 6 is placed at the bottom of the ball head, the steel pin 6 will squeeze the steel foot 4 so that the steel foot 4 is tightly connected to the steel cap 1, thereby fixing the ball head to form an insulator string. However, the present invention changes the insertion position of the steel pin 6: when installing, the operator first passes the steel foot 4 through the connecting groove 2, and then passes the steel pin 6 through the groove 5. When passing through the connecting groove 2, the steel pin 6 is squeezed toward the middle due to the elastic steel of the connecting groove 2. After the steel pin 6 passes through the groove 5, the steel pin 6 is located above the ball head of the steel foot 4. After the steel pin 6 completely enters the steel foot 4 due to the elastic potential energy, its two ends will be squeezed into the connecting groove 2, thereby fixing the steel foot 4 in the connecting groove 2. Then, the installed insulator string is installed on the transmission line tower. Under the action of gravity, the steel cap 1 will be suspended on the steel foot 4. At this time, the steel pin 6 is tightly fitted with the inner wall of the steel cap 1, and there is a certain gap between the steel foot 4 and the steel cap 1 (refer to Figure 4 ), and when the staff is installing the insulator string, the side of the fixing member 8 is installed close to the transmission line tower, and the insulator string is installed;

[0049] It should be noted that in the prior art, when the steel pin 6 is installed, the steel pin 6 is exposed in the connection groove 2 and is fixed in the connection groove 2 only by mutual compression with the steel foot 4. Long-term exposure to the environment is likely to cause material performance degradation or corrosion leading to falling off. However, in the present device, under the action of gravity, when the steel cap 1 is suspended on the steel foot 4, the position of the steel pin 6 moves up in the steel cap 1, and the groove 5 and the steel pin 6 are in a staggered position (refer to Figure 3 ), thereby playing a protective role for the steel pin 6.

[0050] Background technology and Fig.10It can be seen that in the prior art, under the action of strong wind, the disc insulator string will deviate. During operation, the porcelain insulator 3 will not only bear the tensile stress caused by the load, but also the vibration load caused by the dancing of the conductor; in the monsoon season, under the influence of hurricanes, the porcelain insulator 3 will also bear the impact load. During multiple deflections and recovery processes, the cement bonding parts will suffer fatigue damage due to repeated stress. This fatigue accumulation effect will gradually weaken the structural integrity of the cement adhesive, causing the cement bonding parts to easily separate. The present invention sets a rotating component 9 on the steel cap 1. When deflection occurs between the insulators, the retaining frame 94 sets the ball 93 on the same plane during the deflection, and the clamping block 91 rotates with the steel foot 4. The ball 93 is in the movable groove 92, thereby allowing the steel foot 4 to deflect arbitrarily within the range limited by the steel cap 1, increasing the deflection angle of the insulator string. In a strong wind environment, increasing the deflection angle can optimize the force distribution of the insulator string, making it more stable under strong winds. This design can effectively reduce the additional bending moment caused by wind deflection, thereby improving the stability of the entire transmission line. When the steel foot 4 deflects, due to the presence of an inner cavity 21 between the steel foot 4 and the steel cap 1, the two will not contact and thus will not rub when the steel foot 4 deflects in the steel cap 1, which can avoid repeated stress at the cement bonding part under strong wind conditions to weaken the structural integrity of the cement adhesive and prevent water molecules from entering the porcelain body through the cracks generated at the cement bonding part to cause heating.

[0051] In addition, in special terrain areas such as valleys and wind vents, wind force is more concentrated and micro-meteorological characteristics are obvious. Under the action of strong winds, the disc insulator string will deviate, resulting in a decrease in the air gap between the conductor and the pole tower. If the gap is insufficient, it is easy to cause a discharge accident, which in turn leads to a wind-induced flashover failure. Wind-induced flashover failures often occur under severe weather conditions such as strong winds, heavy rains, and hail. These weather conditions will not only increase the swing amplitude of the conductor, but also reduce the discharge voltage between the insulator and the transmission tower, further increasing the risk of wind-induced flashover failures. The device changes the height of one part of the retaining frame 94 so that when the retaining frame 94 deflects following the clamping block 91, when one end of the high slope of the retaining frame 94 deflects upward, it will be hindered due to the height, thereby preventing the steel foot 4 from deflecting toward one side of the transmission tower, so that the air gap between the conductor and the pole tower is kept within a safe range and is not affected by strong winds.

[0052] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A suspension insulator for a power transmission line, comprising a steel cap (1), a connection groove (2) provided on the steel cap (1), a porcelain insulator (3) arranged at the bottom of the steel cap (1), and a steel foot (4) arranged at the bottom of the porcelain insulator (3), characterized in that: The invention also comprises a groove (5) provided on the connecting groove (2) and a steel pin (6) provided on the steel foot (4); the steel pin (6) passes through the groove (5) to fix the steel foot (4) in the connecting groove (2); the steel pin (6) is provided above the steel foot (4); a gap exists between the bottom of the steel foot (4) and the connecting groove (2); a cavity (7) is provided at the upper end of the steel cap (1); a fixing member (8) is provided in the cavity (7); a rotating assembly (9) is provided on the fixing member (8); the rotating assembly (9) is provided between the steel foot (4) and the steel cap (1); and the rotating assembly (9) can increase the rotation amplitude of the steel foot (4).

2. A suspension insulator for a power transmission line according to claim 1, characterized in that: The rotating assembly (9) comprises a clamping block (91), a movable groove (92), a ball (93), a retaining frame (94) and a slide groove (95); the clamping block (91) is fixed to the upper end of the connecting groove (2) via a fixing member (8); the movable groove (92) is provided in a plurality of groups and is opened on the clamping block (91); the slide groove (95) is provided in a plurality of groups and is opened on the inner side of the steel cap (1); the movable groove (92) corresponds to the slide groove (95) one by one; the retaining frame (94) is provided between the clamping block (91) and the inner wall of the steel cap (1); the ball (93) is provided in a plurality of groups and is provided between the slide groove (95) and the movable groove (92); and the ball (93) is movably connected to the retaining frame (94).

3. A suspension insulator for a power transmission line according to claim 2, characterized in that: The slide grooves (95) are circumferentially arranged at equal intervals within a specific arc segment of the clamping block (91), and the central angle of the arc segment is greater than 120°.

4. A suspension insulator for a power transmission line according to claim 3, characterized in that: An inner cavity (21) is also provided in the connecting groove (2), and the inner cavity (21) is arranged in the middle of the connecting groove (2).

5. A suspension insulator for a power transmission line according to claim 4, characterized in that: The fixing member (8) comprises a connecting rod (81) and a notch (82); the connecting rod (81) is rotatably connected in the cavity (7); the notch (82) is provided on the clamping block (91); and one end of the connecting rod (81) is slidably connected in the notch (82).

6. A suspension insulator for a power transmission line according to claim 5, characterized in that: The connecting rod (81) also includes a connecting piece 1 (811), a cross block (812), and a connecting piece 2 (813); the connecting piece 1 (811) is rotatably connected in the cavity (7); the cross block (812) is movably connected to the connecting piece 1 (811); the connecting piece 2 (813) is rotatably connected to the cross block (812); and the clamping block (91) and the retaining frame (94) are both fixedly connected to the connecting piece 2 (813).

7. A suspension insulator for a power transmission line according to claim 5 or 6, characterized in that: The steel pin (6) is in a "U" shape as a whole, and the edge of the steel foot (4) is provided with a rounded corner (61), and the curvature of the rounded corner (61) is equal to the arc-shaped slope surface (41) on the steel foot (4).

8. A suspension insulator for a power transmission line according to claim 7, characterized in that: The width of the groove (5) is between the width of the end of the steel pin (6) and the width of the middle of the steel pin (6), the cross section of the connecting groove (2) is matched with the cross section of the steel foot (4), and the steel pin (6) is spring steel.

9. A suspension insulator for a power transmission line according to claim 8, characterized in that: The retaining frame (94) is in an arc shape, and its upper end surface gradually slopes downward from the end, forming a slope from high to low.

10. A suspension insulator for a power transmission line according to claim 9, characterized in that: Baffles (10) are respectively arranged above and below the clamping block (91), and two groups of baffles (10) are fixedly connected to the steel cap (1).

Images