Lock bolt device suitable for connection of power transmission line cross arm and tower body

Abstract

A lock bolt device suitable for connection of a power transmission line cross arm and a tower body relates to the technical field of power transmission and comprises a U-shaped screw and nuts, the U-shaped screw horizontally penetrates through a vertical plate, the nuts are screwed at two threaded ends of the U-shaped screw, and the nuts are matched with the U-shaped screw to fix the vertical plate on the tower body; a vertical screw hole is formed in the upper end face of the vertical plate, a transverse plate perpendicular to the vertical plate is detachably connected to the upper end face of the vertical plate, studs distributed in the vertical direction are arranged on the transverse plate, and when the studs are completely screwed into the screw hole, the transverse plate and the vertical plate are fixedly connected to form a cross arm; when the transverse plate is fixedly connected with the vertical plate, the rigid tension of the nuts and the top pressure of the studs on the transverse plate resist self-locking. The probability of nut loosening caused by the influence of environmental factors on bolts and nuts is reduced, so that the probability of power transmission line damage caused by cross arm displacement is reduced.

Description

Technical Field

[0001] This invention relates to the field of power transmission technology, specifically to an anti-loosening bolt device suitable for the connection between the crossarm and the tower of a power transmission line. Background Technology

[0002] A crossarm is a structure installed on a utility pole to mount insulators and securely support power transmission lines. The crossarm is designed to support power transmission lines in conjunction with appropriate equipment, therefore it needs to be used in various environments.

[0003] The key factor determining the stability of a crossarm's load-bearing capacity under various environments is the connection mechanism connecting the crossarm to the utility pole, which typically uses bolts and nuts. However, in harsh environments with frequent vibrations, large diurnal temperature variations, and significant wind fluctuations, the bolts and nuts can loosen due to load changes and thermal expansion and contraction. This can lead to the loss of the crossarm's load-bearing capacity, causing the power line to disconnect and disrupting normal circuit operation. Summary of the Invention

[0004] The present invention aims to provide an anti-loosening bolt device suitable for the connection between the crossarm and the tower of a transmission line, so as to reduce the probability of the bolt and nut becoming loose due to the influence of environmental factors, thereby reducing the probability of transmission line damage caused by crossarm displacement.

[0005] To solve the above technical problems, the specific solution adopted by the present invention is as follows:

[0006] A device for preventing loosening bolts at the connection between the crossarm and the tower body of a transmission line includes a U-shaped screw and a nut. The U-shaped screw is horizontally inserted through a vertical plate, and a nut is screwed onto both threaded ends of the U-shaped screw. The nut cooperates with the U-shaped screw to fix the vertical plate to the tower body.

[0007] The upper surface of the vertical plate is provided with a vertical screw hole, and a horizontal plate perpendicular to it is detachably connected to the upper surface of the vertical plate. The horizontal plate is provided with studs distributed vertically. When the studs are fully screwed into the screw hole, the horizontal plate and the vertical plate are fixedly connected to form a crossbeam.

[0008] When the horizontal plate and the vertical plate are fixedly connected, the rigid tension of the nut and the top pressure of the stud on the horizontal plate counteract each other to create a self-locking mechanism.

[0009] As a preferred embodiment of the anti-loosening bolt device applicable to the connection between the crossarm and the tower body of the transmission line according to the present invention, the vertical plate is provided with a positioning hole, the positioning hole is for the U-shaped screw to pass through laterally to fix the vertical plate to the tower body, and the distance from the center of the positioning hole to the side of the vertical plate is less than the outer diameter of the nut by 3 to 6 mm.

[0010] As a preferred embodiment of the anti-loosening bolt device applicable to the connection between the crossarm and the tower body of the transmission line according to the present invention, the lower end of the stud passes through the screw hole and is connected to a pressing component disposed between the stud and the nut. After the lower end of the stud is screwed out of the screw hole, the top pressure of the stud causes the pressing component to press against the lower surface of the nut and lock the nut.

[0011] As a preferred embodiment of the anti-loosening bolt device applicable to the connection between the crossarm and the tower body of the transmission line according to the present invention, the lower end of the stud is provided with a pressing component passing through the screw hole. The pressing component includes a pressing nail that slides vertically in the screw hole and is concentric with the screw hole. A pressing spring is provided around the lower end of the pressing nail. One end of the pressing spring is fixedly connected to the upper end of the pressing nail, and the other end of the pressing spring is fixed to the lower inner wall of the screw hole.

[0012] According to claim 4, a device for preventing loosening bolts used in the connection between the crossarm and the tower body of a transmission line is characterized in that: the lower end of the top-pressing nail passes through the screw hole and is connected to a pressing component, the pressing component is located between the top-pressing nail and the nut, and after the lower end of the top-pressing nail is pressed through the screw hole by the stud, the pressing force of the top-pressing nail causes the pressing component to press against the lower surface of the nut and lock the nut.

[0013] As a preferred embodiment of the anti-loosening bolt device applicable to the connection between the crossarm and the tower body of a transmission line according to the present invention, the pressing assembly includes a limiting sleeve vertically slidably fitted onto a vertical plate. Two connecting hinge plates are provided between the limiting sleeve and the lower end of the stud or top-pressing nail. The two connecting hinge plates are symmetrically distributed on both sides of the vertical plate. One end of each connecting hinge plate is hinged to the limiting sleeve, and the other end of each connecting hinge plate presses against the lower end of the stud or top-pressing nail. The center of each connecting hinge plate is hinged to the lower edge of the vertical plate.

[0014] As a preferred embodiment of the anti-loosening bolt device applicable to the connection between the crossarm and the tower body of a transmission line according to the present invention, the limiting sleeve is provided with two anti-slip pads symmetrically distributed on both sides of the horizontal direction of the vertical plate. The anti-slip pads correspond to the screw blocks or U-shaped screws, and the anti-slip pads are made of elastic rubber material.

[0015] As a preferred embodiment of the anti-loosening bolt device applicable to the connection between the crossarm and the tower body of the transmission line according to the present invention, a docking assembly is provided between the connecting surfaces of the horizontal plate and the vertical plate. The docking assembly includes multiple docking columns and docking grooves. The multiple docking columns are uniformly fixed on the lower side of the horizontal plate along the vertical direction, and the multiple docking grooves are uniformly opened on the upper side of the vertical plate along the vertical direction.

[0016] As a preferred embodiment of the anti-loosening bolt device applicable to the connection between the crossarm and the tower body of a transmission line according to the present invention, the stud is fixed to the lower end of the insulator, the stud passes through countersunk holes vertically distributed on the horizontal plate, and the stud and the screw hole are threadedly connected to fix the horizontal plate and the vertical plate, and the screw hole is opened on the vertical plate and concentric with the countersunk hole.

[0017] As a preferred embodiment of the anti-loosening bolt device applicable to the connection between the crossarm and the tower body of the transmission line according to the present invention, the horizontal plate and the vertical plate are fixedly connected in a T-shape, and the horizontal plate is provided with a mating groove corresponding to the tower body.

[0018] Compared with the prior art, the beneficial effects of this invention are as follows:

[0019] 1) This invention uses a U-shaped screw and nut to position the vertical plate on the tower body, and a stud to fix the vertical plate and horizontal plate together, forming a crossarm positioned on the tower body. The horizontal plate presses against the upper surface of the nut. The rigid tension of the nut and the rotational loosening force exert an upward force on the stud, increasing the friction between the stud and the horizontal and vertical plates when they are fixed together. This reduces the probability of the stud separating from the horizontal and vertical plates. Simultaneously, the downward pressure of the stud restricts the rotation of the nut, further reducing the probability of it loosening. When the force of the stud connecting the horizontal and vertical plates, combined with the rigid tension and rotational loosening force of the nut, creates a self-locking mechanism, the probability of the nut separating from the U-shaped screw is reduced. This decreases the likelihood of environmental factors affecting the bolt and nut, leading to loosening, and consequently, reduces the occurrence of power transmission line damage due to crossarm displacement.

[0020] 2) By setting a top pressure spring to push the top pressure nail, the top pressure nail pushes the stud with an upward force, thereby increasing the friction between the stud and the screw hole when the stud is fixedly connected to the horizontal plate and the vertical plate, thus reducing the probability of the horizontal plate and the vertical plate separating due to the stud loosening.

[0021] 3) This invention uses a stud screwed into a screw hole to push the pressure assembly, which in turn causes the connecting hinge plate of the pressure assembly to rotate with the vertical plate as the fulcrum. This pushes the limiting sleeve to slide on the vertical plate and press the lower side of the nut, thereby further fixing the nut position and reducing the probability of the nut coming loose from the U-shaped screw. This further reduces the occurrence of transmission line damage caused by crossarm displacement. Attached Figure Description

[0022] Figure 1 This is a frontal three-dimensional structural diagram of the present invention;

[0023] Figure 2 This is a rear-view three-dimensional structural diagram of the present invention;

[0024] Figure 3 This is an enlarged structural diagram of point A in the present invention;

[0025] Figure 4 This is a cross-sectional structural diagram of Embodiment 2 of the present invention;

[0026] Figure 5 This is a cross-sectional structural diagram of Embodiment 3 of the present invention;

[0027] Figure 6 This is an enlarged structural diagram of point B in the present invention.

[0028] Reference numerals in the attached drawings: 1. Horizontal plate, 101. Mating groove, 102. Countersunk hole, 2. Insulator, 201. Stud, 3. Vertical plate, 301. Positioning hole, 302. Screw hole, 4. Pressing assembly, 401. Connecting hinge plate, 402. Limiting sleeve, 403. Anti-slip pad, 5. U-shaped screw, 6. Nut, 7. Top pressing assembly, 701. Top pressing nail, 702. Top pressing spring, 8. Connecting assembly, 801. Connecting post, 802. Connecting groove. Detailed Implementation

[0029] Example 1

[0030] A device for preventing loosening bolts at the connection between the crossarm and the tower of a transmission line, such as Figure 1 and Figure 2 As shown, it includes a U-shaped screw 5 and a nut 6. The U-shaped screw 5 is sleeved on the tower body. Then, the U-shaped screw 5, together with the nut 6, makes the vertically set vertical plate 3 stably contact the tower body surface, thereby increasing the friction between the surface of the U-shaped screw 5 and the surface of the vertical plate 3 and the tower body, thus fixing the vertical plate 3 to the tower body. The horizontal plate 1 and the vertical plate 3 are fixedly connected by studs 201 and screw holes 302 opened vertically on the vertical plate 3 to form a crossarm, which makes it easy for personnel to connect the power transmission lines to complete the establishment of the power transmission line.

[0031] The upper side of the vertical plate 3 is detachably connected to the horizontal plate 1. The vertical plate 3 has a positioning hole 301 that passes through it laterally. The positioning hole 301 allows the U-shaped screw 5 to pass through laterally and be threaded to the nut 6, thereby fixing the vertical plate 3 to the tower body. The distance from the center of the positioning hole 301 to the upper side of the vertical plate 3 is less than the outer diameter of the nut 6 by 4.5mm. After the horizontal plate 1 and the vertical plate 3 are fixedly connected by the stud 201 and the screw hole 302, the horizontal plate 1 will be subjected to the top pressure generated by the stud 201 and the screw hole 302 to press the surface of the nut 6. After the surface of the nut 6 is pressed, the rigid tension and loosening rotation force of the nut 6 will be mutually pressed and self-locked by the top pressure applied to the horizontal plate 1 by the stud 201, thereby reducing the probability of the nut 6 loosening and separating from the U-shaped screw 5.

[0032] The horizontal plate 1 and the vertical plate 3 are fixedly connected in a T-shape, which allows the horizontal plate 1 to block dirt and rainwater from the vertical upward, thereby protecting the vertical plate 3 and the nut 6. This reduces the probability of the nut 6 and the vertical plate 3 being damaged by dirt corrosion, and further reduces the probability of the nut 6 being damaged. In other words, it reduces the probability of the transmission line being damaged by the displacement of the horizontal plate 1 and the vertical plate 3. The horizontal plate 1 is provided with a matching groove 101 at the corresponding position on the tower body, so that the horizontal plate 1 can adapt to different edges and corners on the tower body to a certain extent.

[0033] A docking assembly 8 is provided between the connecting surfaces of the horizontal plate 1 and the vertical plate 3. Before the personnel fix the horizontal plate 1 to the vertical plate 3 with the stud 201, the horizontal plate 1 can be engaged with the vertical plate 3 through the docking assembly 8. This helps the personnel to align the stud 201 with the screw hole 302 opened on the vertical plate 3. It also reduces the inconvenience of the personnel maintaining the position of the horizontal plate 1 to screw the stud 201 into the screw hole 302. Thus, it is easier for the personnel to fix the horizontal plate 1 and the vertical plate 3 to form a crossbeam for use. The docking assembly 8 includes multiple docking posts 801 and docking slots 802. The docking posts 801 and docking slots 802 are designed to facilitate the quick and stable snap-fit ​​positioning of the horizontal plate 1 onto the vertical plate 3, thereby facilitating the subsequent fixed connection of the horizontal plate 1 and the vertical plate 3 using studs 201. The multiple docking posts 801 are evenly fixed vertically on the lower side of the horizontal plate 1, and the multiple docking slots 802 are evenly opened vertically on the upper side of the vertical plate 3, thereby enabling the multiple docking posts 801 and docking slots 802 to snap together to assist in the assembly of the vertical plate 3 and the horizontal plate 1.

[0034] The above are basic embodiments of the present invention. Further improvements, optimizations, and limitations can be made based on the above to obtain the following embodiments:

[0035] Example 2

[0036] This embodiment further elaborates on the structure of the locking nut 6 based on Embodiment 1. Its main structure is the same as in Embodiment 1, as detailed below: Figure 4 As shown, the lower end of the stud 201 passes through the transverse plate 1 and is threaded to a screw hole 302. The lower end of the stud 201 passes through the screw hole 302 and is connected to a pressing assembly 4 located between the stud 201 and the nut 6. After the lower end of the stud 201 is screwed out of the screw hole 302, the top pressure of the stud 201 causes the pressing assembly 4 to press against the lower surface of the nut 6 to prevent the nut 6 from loosening.

[0037] like Figure 3 and Figure 4As shown, the pressing assembly 4 includes a limiting sleeve 402 that is vertically slidably sleeved on the vertical plate 3, thereby limiting the lateral position of the limiting sleeve 402. Two connecting hinge plates 401 are provided between the limiting sleeve 402 and the lower end of the stud 201 or the pressing pin 701. The two connecting hinge plates 401 are symmetrically distributed on both sides of the vertical plate 3. One end of the two connecting hinge plates 401 is hinged to the limiting sleeve 402, and the other end of the two connecting hinge plates 401 contacts the lower end of the stud 201 or the pressing pin 701. This allows the stud 201 to push the lower end of the connecting hinge plate 401 downward when it is screwed into the screw hole 302 and pressed downward. At the same time, it can connect the limiting sleeve 402 to drive the downward pressing of the stud 201. The two connecting hinge plates 401 are hinged at the center of the lower edge of the vertical plate 3. After the stud 201 presses down on the lower end of the connecting hinge plate 401, it can rotate with the hinge point with the vertical plate 3 as the fulcrum, thereby pushing the limiting sleeve 402 to move from bottom to top. Then the limiting sleeve 402 can press the lower side of the nut 6 and the U-shaped screw 5, thereby restricting the relative position of the nut 6 and the U-shaped screw 5, thereby reducing the probability of the nut 6 loosening and separating from the U-shaped screw 5, while maintaining the relative position of the nut 6 and the U-shaped screw 5. That is, to a certain extent, the relative position of the horizontal plate 1 and the vertical plate 3 is improved, thereby improving the stability of the horizontal plate 1 and the vertical plate 3 in positioning on the tower body.

[0038] Anti-slip pads 403 are fixedly connected to the limiting sleeve 402, symmetrically distributed around the vertical plate 3. This adapts to the vertical distance between the lower side of the nut 6 and the lower side of the U-shaped screw 5, allowing the limiting sleeve 402 to stably press against the lower side of the nut 6 and the U-shaped screw 5. This, in turn, can improve the relative position of the horizontal plate 1 and the vertical plate 3 to a certain extent, thereby improving the stability of the horizontal plate 1 and the vertical plate 3 in positioning on the tower body. The anti-slip pads 403 correspond to the screw blocks and the U-shaped screw 5. The anti-slip pads 403 are made of elastic rubber material, which improves the connection stability between the anti-slip pads 403 and the nut 6 and the U-shaped screw 5, that is, improves the friction between the limiting sleeve 402 and the surfaces of the nut 6 and the U-shaped screw 5. This further enhances the position limiting function of the nut 6 and the U-shaped screw 5.

[0039] Example 3

[0040] This embodiment further elaborates on the structure of the locking nut 6 based on Embodiment 1. Its main structure is the same as in Embodiment 1, as detailed below: Figure 5 and Figure 6As shown, the lower end of the stud 201 is threaded through the horizontal plate 1 and connected to a screw hole 302. The screw hole 302 is vertically formed in the vertical plate 3. A pressing assembly 7 is provided inside the screw hole 302. The pressing assembly 7 includes a pressing pin 701 that slides vertically inside the screw hole 302 and is concentric with the screw hole 302. A pressing spring 702 is provided around the lower end of the pressing pin 701. The pressing spring 702 can push the pressing pin 701 to move upward, thereby pressing the stud 201 with the pressing pin 701. When the stud 201 is threaded into the screw hole 302, the stud 201 has an upward pushing force, which increases the friction between the surface of the stud 201 and the inner wall of the screw hole 302, thereby reducing the probability of the stud 201 coming loose, that is, reducing the probability of the horizontal plate 1 and the vertical plate 3 separating. Then the locking function of the nut 6 can be maintained. One end of the top pressure spring 702 is fixedly connected to the upper end of the top pressure nail 701, and the other end of the top pressure spring 702 is fixed to the lower inner wall of the screw hole 302.

[0041] The lower end of the top pressure pin 701 passes through the screw hole 302 and is connected to the pressing component 4. The pressing component 4 is located between the top pressure pin 701 and the nut 6. After the lower end of the top pressure pin 701 is pressed through the screw hole 302 by the stud 201, the pressing force of the top pressure pin 701 causes the pressing component 4 to press against the lower surface of the nut 6 to prevent the nut 6 from loosening.

[0042] like Figure 5 , Figure 6 and Figure 3 As shown, the pressing assembly 4 includes a limiting sleeve 402 that is vertically slidably sleeved on the vertical plate 3, thereby limiting the lateral position of the limiting sleeve 402. Two connecting hinge plates 401 are provided between the limiting sleeve 402 and the lower end of the stud 201 or the pressing pin 701. The two connecting hinge plates 401 are symmetrically distributed on both sides of the vertical plate 3. One end of the two connecting hinge plates 401 is hinged to the limiting sleeve 402, and the other end of the two connecting hinge plates 401 contacts the lower end of the stud 201 or the pressing pin 701. This allows the stud 201 to push the lower end of the connecting hinge plate 401 downward when it is screwed into the screw hole 302 and pressed downward. At the same time, it can connect the limiting sleeve 402 to drive the downward pressing of the stud 201. The two connecting hinge plates 401 are hinged at the center of the lower edge of the vertical plate 3. After the stud 201 presses down on the lower end of the connecting hinge plate 401, it can rotate with the hinge point with the vertical plate 3 as the fulcrum, thereby pushing the limiting sleeve 402 to move from bottom to top. Then the limiting sleeve 402 can press the lower side of the nut 6 and the U-shaped screw 5, thereby restricting the relative position of the nut 6 and the U-shaped screw 5, thereby reducing the probability of the nut 6 loosening and separating from the U-shaped screw 5, while maintaining the relative position of the nut 6 and the U-shaped screw 5. That is, to a certain extent, the relative position of the horizontal plate 1 and the vertical plate 3 is improved, thereby improving the stability of the horizontal plate 1 and the vertical plate 3 in positioning on the tower body.

[0043] Anti-slip pads 403 are fixedly connected to the limiting sleeve 402, symmetrically distributed around the vertical plate 3. This adapts to the vertical distance between the lower side of the nut 6 and the lower side of the U-shaped screw 5, allowing the limiting sleeve 402 to stably press against the lower side of the nut 6 and the U-shaped screw 5. This, in turn, can improve the relative position of the horizontal plate 1 and the vertical plate 3 to a certain extent, thereby improving the stability of the horizontal plate 1 and the vertical plate 3 in positioning on the tower body. The anti-slip pads 403 correspond to the screw blocks and the U-shaped screw 5. The anti-slip pads 403 are made of elastic rubber material, which improves the connection stability between the anti-slip pads 403 and the nut 6 and the U-shaped screw 5, that is, improves the friction between the limiting sleeve 402 and the surfaces of the nut 6 and the U-shaped screw 5. This further enhances the position limiting function of the nut 6 and the U-shaped screw 5.

[0044] Example 4

[0045] This embodiment further elaborates on the structure of the stud 201 based on Embodiment 1. Its main structure is the same as in Embodiment 1, as detailed below: Figure 1 and Figure 2 As shown, the stud 201 is fixed to the lower end of the insulator 2, which facilitates the positioning of the insulator 2 by personnel. This reduces the need for personnel to install each insulator 2 individually after installing the crossarm, thus improving the efficiency of the transmission line construction. The stud 201 is installed through countersunk holes 102 vertically distributed on the transverse plate 1. The countersunk holes 102 are designed to stably position the insulator 2 and transfer the weight of the transmission line to the transverse plate 1, which then transfers it to the vertical plate 3 and the tower body, thereby achieving stable construction of the transmission line. The stud 201 also bears a certain weight, increasing the downward pressure on it. This increased downward pressure strengthens the locking of the nut 6, further reducing the possibility of the nut 6 loosening and rotating, separating from the U-shaped screw 5. This further reduces damage to the transmission line caused by displacement of the transverse plate 1 and the vertical plate 3. The countersunk hole 102 is made on the vertical plate 3 and is concentric with the countersunk hole 302, which makes it easier for personnel to pass the stud 201 through and thread it into the screw hole 302 to fix the horizontal plate 1 and the vertical plate 3 to form a crossbeam.

Claims

1. A device for preventing loosening bolts at the connection between the crossarm and the tower body of a transmission line, characterized in that: The utility model relates to a tower body fixing structure, including U screw (5) and nut (6), U screw (5) passes through vertical board (3) and is set up horizontally, and the both threaded ends of U screw (5) are rotated and are equipped with nut (6), and nut (6) is used with U screw (5) cooperation for vertical board (3) is fixed in tower body, The upper end surface of the vertical board (3) is provided with a vertical screw hole (302), and the upper end surface of the vertical board (3) is detachably connected with a transverse board (1) perpendicular thereto, and the transverse board (1) is provided with studs (201) distributed along the vertical direction; when the studs (201) are completely screwed into the screw holes (302), the transverse board (1) is fixedly connected with the vertical board (3) to form a cross arm. When the transverse board (1) is fixedly connected with the vertical board (3), the rigid tension of the nut (6) is in opposition to the self-locking of the transverse board (1) under the pressure of the studs (201).

2. The anti-loose bolt device for connecting the cross arm and the tower body of a power transmission line according to claim 1, characterized in that: The vertical board (3) is provided with a positioning hole (301), the positioning hole (301) is used for the U screw (5) to pass through the vertical board (3) to be fixed in the tower body, and the distance from the center of the positioning hole (301) to the upper side of the vertical board (3) is less than 3-6 mm of the outer diameter of the nut (6).

3. The anti-loose bolt device for the connection between the cross arm and the tower body of a power transmission line according to claim 1, characterized in that: The lower end of the stud (201) passes through the screw hole (302) and is connected with a pressing assembly (4) arranged between the stud (201) and the nut (6); after the lower end of the stud (201) is unscrewed from the screw hole (302), the pressing force of the stud (201) presses the lower surface of the nut (6) to lock the nut (6).

4. The anti-loose bolt device for the connection of the cross arm and the tower body of the power transmission line according to claim 1, characterized in that: The lower end of the stud (201) passes through the screw hole (302) and is provided with a pressing assembly (7); the pressing assembly (7) comprises a pressing nail (701) vertically sliding in the screw hole (302) and concentric with the screw hole (302); a pressing spring (702) is arranged around the lower end of the pressing nail (701); one end of the pressing spring (702) is fixedly connected to the upper end of the pressing nail (701), and the other end of the pressing spring (702) is fixed to the inner wall of the lower side of the screw hole (302).

5. The anti-loose bolt device for the connection of the cross arm and the tower body of the power transmission line according to claim 4, characterized in that: The lower end of the stud (201) passes through the screw hole (302) and is connected with a pressing assembly (4) arranged between the stud (201) and the nut (6); after the lower end of the stud (201) is unscrewed from the screw hole (302), the pressing force of the stud (201) presses the lower surface of the nut (6) to lock the nut (6).

6. The anti-loose bolt device for the connection of the cross arm and the tower body of a power transmission line according to claim 3 or 5, characterized in that: The pressing assembly (4) comprises a limiting sleeve (402) vertically slidingly sleeved on the vertical board (3); two connecting hinge plates (401) are arranged between the limiting sleeve (402) and the lower end of the stud (201) or the pressing nail (701); the two connecting hinge plates (401) are symmetrically distributed on both sides of the vertical board (3); one end of each of the two connecting hinge plates (401) is hingedly connected to the limiting sleeve (402); the other end of each of the two connecting hinge plates (401) is pressed by the lower end of the stud (201) or the pressing nail (701); and the center of each of the two connecting hinge plates (401) is hingedly connected to the lower end edge of the vertical board (3).

7. The anti-loose bolt device for the connection of the cross arm and the tower body of the power transmission line according to claim 6, characterized in that: The limiting sleeve (402) is provided with two anti-skid pads (403) symmetrically distributed on the lateral sides of the vertical plate (3), the anti-skid pads (403) correspond to the screw blocks or U-shaped screw rods (5), and the anti-skid pads (403) are made of elastic rubber material.

8. The anti-loose bolt device for the connection of the cross arm and the tower body of the power transmission line according to claim 1, characterized in that: The connecting surface between the lateral plate (1) and the vertical plate (3) is provided with a butt joint assembly (8), the butt joint assembly (8) comprises a plurality of butt joint columns (801) and butt joint grooves (802), the plurality of butt joint columns (801) are fixed on the lower side of the lateral plate (1) in the vertical direction, and the plurality of butt joint grooves (802) are evenly formed on the upper side of the vertical plate (3) in the vertical direction.

9. The anti-loose bolt device for the connection of the cross arm and the tower body of the power transmission line according to claim 1, characterized in that: The screw post (201) is fixed to the lower end of the insulator (2), the screw post (201) passes through the countersunk hole (102) formed on the lateral plate (1) in the vertical direction and is arranged in threaded connection with the screw hole (302) for fixed connection of the lateral plate (1) and the vertical plate (3), and the screw hole (302) is formed on the vertical plate (3) concentrically with the countersunk hole (102).

10. The anti-loose bolt device for the connection of the cross arm and the tower body of the power transmission line according to claim 1, characterized in that: The lateral plate (1) and the vertical plate (3) are fixedly connected in a T shape, and the lateral plate (1) is provided with a matching groove (101) corresponding to the tower body.

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