CN114197940B

CN114197940B - Linear cross arm clamp and linear cross arm clamp assembly

Info

Publication number: CN114197940B
Application number: CN202111351660.0A
Authority: CN
Inventors: 张清明; 胡海斌; 谢乔养; 阳耀鹏; 陈诚; 李甘友; 黄康裕; 肖检平; 李晶; 梁进兴; 于校彬; 周相伯; 代康; 潘志新; 李建宁; 杨忠佳
Original assignee: Guilin Power Supply Bureau of Guangxi Power Grid Co Ltd
Current assignee: Guilin Power Supply Bureau of Guangxi Power Grid Co Ltd
Priority date: 2021-11-16
Filing date: 2021-11-16
Publication date: 2023-08-08
Anticipated expiration: 2041-11-16
Also published as: CN114197940A

Abstract

The invention discloses a straight-line cross arm clamp which comprises an outer clamping plate and an inner clamping plate, wherein the outer clamping plate and the inner clamping plate are respectively of L-shaped plate structures, the corners of the outer clamping plate and the inner clamping plate are consistent in orientation, the outer clamping plate and the inner clamping plate can form a distance for placing tower materials, and a locking mechanism is arranged between the outer clamping plate and the inner clamping plate so as to drive the outer clamping plate and the inner clamping plate to be close to each other. The invention also discloses a straight-line cross arm clamp group, which is provided with two straight-line cross arm clamps and a counter-pulling mechanism, and the two straight-line cross arm clamps can be firmly locked on the pole tower through the counter-pulling mechanism so as to improve the bearing capacity of the device.

Description

Linear cross arm clamp and linear cross arm clamp assembly

Technical Field

The invention relates to the technical field of power line maintenance, in particular to a linear cross arm clamp and a linear cross arm clamp assembly.

Background

The transmission line is erected in the field and runs throughout the year, and the insulator is subjected to the phenomena of zero value or damage easily caused by overvoltage impact, own quality defect, collision existing in transportation and the like. In order to timely replace the device, the device can be developed under the condition of electrification or power failure. At present, the power load is rapidly increased, so that the power is normally supplied, the power quantity is increased, the power supply and the power distribution are realized, the power transmission line is available at present and the requirement on the utilization rate is relatively improved, and the line is difficult to timely carry out power failure maintenance after the defect is found. In order to ensure the timely elimination of the line defect and avoid the uninterrupted power supply of the line, the live working elimination of the line is required to be carried out under the uninterrupted power supply condition of the line. The straight-line cross arm clamp used in the original live working is directly inserted into the vertical faces of the tower materials at the two sides of the cross arm according to the L-shaped main tower materials, the outer side of the straight-line cross arm clamp extends out of the lifting support, and lifting wires are matched through a whole set of screw rods. The disadvantage of this straight crossarm card is that only lightweight wires can be lifted. At present, in the operation of live replacement of a linear pole tower insulator, a linear cross arm clamp is arranged on a cross arm head, and the conventional linear cross arm clamp cannot meet the requirement of line bearing at present for reasons of large line blocking distance, large line diameter, multiple split wires, thin tower materials, heavy mass and the like. Therefore, a set of linear cross arm clamps which can meet the line bearing requirements at the present stage and are applicable to the assembly of different pole tower cross arm heads are required to be developed, so that the problems are solved conveniently.

Disclosure of Invention

Aiming at the defects, the invention provides the linear cross arm clamp which can solve the problem that the existing linear cross arm clamp cannot meet the requirement of line bearing at the present stage due to large line blocking distance, large line diameter, multiple split wires, thin tower materials, heavy mass and the like.

In order to achieve the above purpose, the invention adopts the following technical scheme:

the utility model provides a sharp cross arm card, includes outer cardboard and interior card board, outer cardboard and interior card board are L plate structure respectively, outer cardboard and interior cardboard's turning orientation is unanimous just outer card board and interior card board can form a interval that is used for placing the tower material, be provided with locking mechanism between outer cardboard and the interior card board in order to can drive outer cardboard and interior card board are close to each other; the outer clamping plate is provided with a lifting bracket at the side surface far away from the inner clamping plate.

Further, a lifting screw rod is placed on the lifting support, a U-shaped placing bayonet is arranged on one side, far away from the inner clamping plate, of the lifting support, and U-shaped clamping bayonets are respectively arranged at the upper end and the lower end of the lifting support; the lifting screw rod comprises a lifting sleeve, a lifting threaded rod, a clamping rod, a lifting rotating part and a rotating sleeve, wherein the rotating sleeve is rotatably installed in the lifting sleeve and sleeved on the lifting threaded rod in a threaded connection mode, the clamping rod is radially arranged on the periphery opposite to the lifting sleeve and located in a U-shaped clamping bayonet, the lifting threaded rod penetrates through the U-shaped bayonet from top to bottom, the lifting rotating part is installed on the rotating sleeve, a limiting groove extending along the axial direction is formed in the lifting threaded rod, and limiting protrusions located in the limiting groove are arranged on the inner wall of the lifting sleeve.

Further, a clamping mechanism for limiting the clamping rod to go out is arranged at the opening of the U-shaped clamping bayonet.

Further, the locking mechanism comprises a rotating rod, a positioning rod and a limiting rod, the positioning rod and the limiting rod are fixedly arranged on the side face of the lifting support, which is provided with the end part of the U-shaped locking bayonet, and are positioned on two sides of the U-shaped locking bayonet, one end of the rotating rod is provided with an elongated slot extending along the axial direction, the other end of the rotating rod is provided with an inserting bayonet capable of inserting the limiting rod at the end face, and the rotating rod is sleeved on the positioning rod through the elongated slot so as to rotate around the positioning rod and move along the direction close to or far away from the limiting rod through the elongated slot.

Further, the locking mechanism is a bolt and nut assembly.

Further, longitudinal strip holes are respectively formed in the end portions of the vertical portions and the transverse portions of the outer clamping plate and the inner clamping plate, and the locking mechanism of the bolt and nut assembly penetrates through the strip holes and locks the outer clamping plate and the inner clamping plate.

The invention also provides a linear cross arm clamp assembly, which comprises two linear cross arm clamps, wherein two inner clamp plates between the two linear cross arm clamps are positioned at one side close to each other, and a counter-pulling mechanism is arranged between the two inner clamp plates so as to drive the two inner clamp plates to be close to each other.

Further, the opposite pulling mechanism comprises a first opposite pulling threaded rod, a second opposite pulling threaded rod, an opposite pulling sleeve and an opposite pulling rotating part, one ends of the first opposite pulling threaded rod and the second opposite pulling threaded rod are respectively installed on an inner clamping plate through opposite pulling trunnions, the other ends of the first opposite pulling threaded rod and the second opposite pulling threaded rod are in threaded connection with two ends of the opposite pulling sleeve, and the opposite pulling rotating part is installed on the opposite pulling sleeve, so that the opposite pulling sleeve is driven to rotate through the opposite pulling rotating part to achieve the approaching or separating of the two inner clamping plates.

Further, the opposite-pulling rotating part is a bidirectional ratchet wrench.

Further, the positions of the first counter-pulling threaded rod, the second counter-pulling threaded rod and the counter-pulling trunnion are axially adjustable.

Compared with the prior art, the invention has the beneficial effects that:

1. the invention provides a straight-line cross arm clamp which can ensure that the straight-line cross arm clamp is firmly installed on a tower material and has enough bearing capacity to meet the bearing requirements under the characteristic working conditions of large blocking distance, large wire diameter, multiple split wires, thin tower material, heavy mass and the like of an electric power line in the current stage and the future development trend;

2. the invention provides a straight-line cross arm clamp group, which is provided with two straight-line cross arm clamps and a counter-pulling mechanism, wherein the two straight-line cross arm clamps can be firmly locked on a pole tower through the counter-pulling mechanism, so that the bearing capacity of the device is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the description of the embodiments will be briefly described below.

Fig. 1 is a schematic structural view of embodiment 1 in a use state;

FIG. 2 is a schematic view of the structure of the lifting screw of FIG. 1;

fig. 3 is a schematic structural diagram of embodiment 1 in another use state;

fig. 4 is a schematic structural diagram of embodiment 2 in a use state.

Wherein the symbols shown in the figures are: 10-an outer clamping plate; 20-an inner clamping plate; 31-lifting the bracket; 311-U-shaped placement bayonet; 312-U-shaped clamping bayonets; 32-lifting the screw rod; 321-lifting the sleeve; 322-lifting the threaded rod; 323-a locking rod; 324-lifting the rotating part; 325-rotating the sleeve; 326-limit groove; 327-limit protrusions; 331-rotating the lever; 332-positioning rod; 333-a stop lever; 334-an elongated slot; 335-insert bayonet; 40-a bolt-nut assembly; 50-elongated holes; 60-a pull-to-pull mechanism; 61-a first pair of pull threaded rods; 62-a second pair of pull threaded rods; 63-pulling the sleeve; 64-a pull-up rotating part; 65-split trunnion.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Example 1

Referring to fig. 1, a straight-line cross arm card according to a preferred embodiment of the present invention mainly includes an outer card plate 10 and an inner card plate 20. The outer clamping plate 10 and the inner clamping plate 20 are respectively of L-shaped plate structures, the corners of the outer clamping plate 10 and the inner clamping plate 20 face the same direction, the outer clamping plate 10 and the inner clamping plate 20 can form a distance for placing tower materials, the outer clamping plate 10 and the inner clamping plate 20 are respectively installed on the outer side and the inner side of the L-shaped tower materials through the L-shaped plate structures, the outer clamping plate 10 is installed and smashes the outer side, and the inner clamping plate 20 is installed on the inner side. A locking mechanism is provided between the outer card 10 and the inner card 20 to be able to drive the outer card 10 and the inner card 20 to approach each other, and of course, the mutual driving action of the outer card 10 and the inner card 20 can be released by the locking mechanism. In the preferred embodiment, the locking mechanism is a bolt and nut assembly 40, that is, a bolt and nut are included, so that the outer clamping plate 10 and the inner clamping plate 20 which are positioned on the outer side and the inner side of the L shape of the tower can be mutually close to each other and the straight cross arm is clamped and fixed on the tower through the bolt and the nut. Firm locking can be achieved through the mode of locking of the bolt and nut assembly 40, and the straight cross arm clamp is effectively prevented from falling off from the tower material, so that the requirement of existing line bearing is met.

In a preferred embodiment, the ends of the upright and transverse portions of the outer and inner cards 10, 20 are provided with longitudinal elongated holes 50, respectively, for the locking mechanism of the bolt-and-nut assembly 40 to pass through the elongated holes 50 and to effect locking of the outer and inner cards 10, 20. Considering that the sizes of the tower L-shapes may be different, if circular through holes are provided in the outer and inner clamping plates 10 and 20 and connected by the bolt and nut assemblies 40, it may not be suitable for the tower L-shapes of various sizes. In the preferred embodiment, the elongated hole 50 is provided, so that the position of the bolt and nut assembly 40 in the elongated hole 50 can be adjusted according to the L-shaped size of the tower material so as to adapt to the L-shaped tower material with different sizes, and the position of the bolt and nut assembly 40 in the elongated hole 50 can be adjusted so that the bolt and nut assembly 40 is positioned at the edge end part of the L-shaped tower material, so that the periphery of the whole L-shaped tower material can be circumferentially surrounded by the bolt and nut assembly 40, the outer clamping plate 10 and the inner clamping plate 20, and the linear cross arm clamp can be firmly installed on the L-shaped tower material. The straight-line cross arm clamp can be firmly arranged on the L shape of the tower material, and can meet the bearing requirements of the power line with large blocking distance, large line diameter, multiple split wires, thin tower material, heavy weight and other characteristic working conditions in the current stage and the future development trend so as to ensure the lifting of the wires. In addition, the present invention can be applied to not only L-shaped tower materials but also L-shaped tower materials, as shown in fig. 3, in comparison with the conventional linear crossarm caine insertion method.

Referring to fig. 1 to 3, the outer card 10 is provided with a lifting bracket 31 at a side surface remote from the inner card 20 for placing a lifting screw 32. The lifting support 31 is provided with a U-shaped placing bayonet 311 on one side far away from the inner clamping plate 20, the U-shaped placing bayonet 311 directly penetrates through the bottom downwards from the top of the lifting support 31, the lifting support 31 is respectively provided with a U-shaped clamping bayonet 312 at the upper end and the lower end, and the U-shaped clamping bayonet 312 is positioned on two sides of the upper end and the lower end of the lifting support 31. The lifting screw 32 comprises a lifting sleeve 321, a lifting threaded rod 322, a clamping rod 323, a lifting rotating part 324 and a rotating sleeve 325, wherein the rotating sleeve 325 is rotatably installed in the lifting sleeve 321 and sleeved on the lifting threaded rod 322 in a threaded connection mode, the clamping rod 323 is radially arranged on the periphery opposite to the lifting sleeve 321 and positioned in a U-shaped clamping bayonet 312, the lifting threaded rod 322 penetrates through the U-shaped placing bayonet 311 from top to bottom, the lifting rotating part 324 is installed on the rotating sleeve 325, the lifting threaded rod 322 is provided with a limiting groove 326 extending along the axial direction, and the inner wall of the lifting sleeve 321 is provided with a limiting protrusion 327 positioned in the limiting groove 326. The lower end of the lifting threaded rod 322 is mounted with an end for connection to the support plate, the specific structure of which is directly referred to the prior art and will not be described in detail.

In the preferred embodiment, in order to accommodate both the L-shaped tower and the L-shaped tower, the U-shaped locking bayonets 312 are located on both sides of the upper and lower ends of the lifting bracket 31 so that the U-shaped locking bayonets 312 can be located at the upper end (the upper end refers to the end that faces upward in the present invention) of the lifting bracket 31 as well as for the L-shaped tower or the L-shaped tower, so that the locking bars 323 can be located in the U-shaped locking bayonets 312 to interact with the locking bars 323. The lifting rotation portion 324 is a bidirectional ratchet wrench, so that the driving rotation direction of the lifting rotation portion 324 is adjusted by adjusting the clamping direction of the ratchet wrench. During implementation, the lifting rotating part 324 is rotated to drive the rotating sleeve 325 to rotate, under the action of the limiting groove 326 and the limiting protrusion 327, and the threaded sleeve 321 cannot rotate due to the fact that the clamping rod 323 is located in the U-shaped clamping bayonet 312, so that the lifting threaded rod 322 can perform lifting motion, and at the moment, upward or downward lifting motion can be achieved through the lifting threaded rod 322, so that lifting motion of a wire can be achieved.

In a preferred embodiment, a locking mechanism for limiting the egress of the locking rod 323 is provided at the opening of the U-shaped locking bayonet 312 to prevent the locking rod 323 from jumping out of the U-shaped locking bayonet 312. The locking mechanism comprises a rotating rod 331, a positioning rod 332 and a limiting rod 333, wherein the positioning rod 332 and the limiting rod 333 are fixedly arranged at the outer side surface of the end part of the lifting bracket 31, which is provided with a U-shaped locking bayonet 312, and are positioned at two sides of the U-shaped locking bayonet 312, one end of the rotating rod 331 is provided with an elongated slot 334 extending along the axial direction, the other end of the rotating rod 331 is provided with an inserting bayonet 335 capable of inserting the limiting rod 333 at the end surface, the rotating rod 331 is sleeved on the positioning rod 332 through the elongated slot 334 so as to rotate around the positioning rod 332 and move along the direction close to or far away from the limiting rod 333 through the elongated slot 334, the outer side end part of the positioning rod 332 is provided with an outward boss, and the boss is larger than the elongated slot 334 so that the rotating rod 331 cannot go out from the outer side end part of the positioning rod 332. The outer end of the stop lever 333 is provided with an outward boss, which is larger than the elongated slot 334 so that the rotation lever 331 cannot exit from the outer end of the stop lever 333. In practice, after the locking lever 323 is placed into the U-shaped locking bayonet 312, the rotating lever 331 is rotated (rotated from a position above the U-shaped locking bayonet 312) so that the insertion bayonet 335 of the rotating lever 331 is aligned with the stop lever 333, then the rotating lever 331 is moved along the long groove 334 toward the stop lever 333, and the insertion bayonet 335 is inserted into the stop lever 333, at this time, the rotating lever 331 cannot rotate or move due to the action of the rotating lever 331 and the stop lever 333, and there is a restriction effect on the opening of the U-shaped locking bayonet 312, so that the locking lever 323 cannot exit from the opening of the U-shaped locking bayonet 312. When the lifting screw rod 32 on the U-shaped locking bayonet 312 needs to be removed, the rotating rod 331 is moved along the long groove 334 in a direction away from the limit rod 333, so that the insertion bayonet 335 is separated from the limit rod 333, and at this time, the rotating rod 331 can be rotated, and the limitation on the corresponding U-shaped locking bayonet 312 is released.

Example 2

The present preferred embodiment provides a straight-line cross arm card assembly, please refer to fig. 4, which includes two straight-line cross arm cards as described in embodiment 1, two inner clamping plates 20 between the two straight-line cross arm cards are located at one side close to each other, and a counter-pulling mechanism 60 is further provided between the two inner clamping plates 20 to drive the two inner clamping plates 20 to be close to each other. Considering that it is generally necessary to install the linear cross arm clip at two ends of the tower cross arm head so as to achieve lifting of the wires at two sides, in this preferred embodiment, two linear cross arm clips are provided to be respectively installed at two ends of the tower cross arm head, and considering that an outward tension is applied to the linear cross arm clip during implementation, at this time, the outward tension may make the linear cross arm clip outward and affect stable installation of the linear cross arm clip. Therefore, in the preferred embodiment, the pulling mechanism 60 disposed between the two inner clamping plates 20 is further included to drive the two inner clamping plates 20 to approach each other, so that the pulling of the two inner clamping plates 20, that is, the pulling of the two linear cross arm cards, can be realized through the pulling mechanism 60, so as to realize the stable installation.

The pull-to-pull mechanism 60 comprises a first pull-to-pull threaded rod 61, a second pull-to-pull threaded rod 62, a pull-to-pull sleeve 63 and a pull-to-pull rotating portion 64, wherein one ends of the first pull-to-pull threaded rod 61 and the second pull-to-pull threaded rod 62 are respectively installed on one inner clamping plate 20 through pull-to-pull trunnions 65, the other ends of the first pull-to-pull threaded rod 61 and the second pull-to-pull threaded rod 62 are in threaded connection with two ends of the pull-to-pull sleeve 63, the pull-to-pull sleeve 63 is provided with internal threads, the first pull-to-pull threaded rod 61 and the second pull-to-pull threaded rod 62 are provided with external threads with opposite rotation directions, and the pull-to-pull rotating portion 64 is installed on the pull-to-pull sleeve 63, so that the pull-to-pull sleeve 63 is driven by the pull-rotating portion 64 to enable the approach or the separation of the two inner clamping plates 20. The opposite-pulling rotation part 64 is a bidirectional ratchet wrench, so that the driving rotation direction of the opposite-pulling rotation part 64 is adjusted by adjusting the clamping direction of the ratchet wrench. In practice, the opposite-pulling sleeve 63 is driven to rotate by rotating the opposite-pulling rotating part 64, so that the first opposite-pulling threaded rod 61 and the second opposite-pulling threaded rod 62 can be driven to approach or separate from each other, when the first opposite-pulling threaded rod 61 and the second opposite-pulling threaded rod 62 approach each other, the two inner clamping plates 20 connected with the first opposite-pulling threaded rod 61 and the second opposite-pulling threaded rod 62 approach each other, the two straight-line cross arm clamps approach each other, and the two straight-line cross arm clamps can be firmly locked on the tower through opposite pulling, so that the bearing capacity of the device is improved.

In a preferred embodiment, the positions of the first and second pair of pull threaded rods 61, 62 and the pair of pull trunnions 65 are axially adjustable. Specifically, the counter-pulling trunnion 65 is provided with a plurality of through holes in a direction toward or away from the opposite inner clamping plate 20, and the first counter-pulling threaded rod 61 and the second counter-pulling threaded rod 62 are respectively connected with the through holes through bolts, so that when the counter-pulling trunnion is mounted on different through holes, the positions of the first counter-pulling threaded rod 61 and the second counter-pulling threaded rod 62 and the counter-pulling trunnion 65 can be conveniently and rapidly changed, so that the counter-pulling trunnion is suitable for tower cross arm heads with different widths.

The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a sharp cross arm card which characterized in that: the novel tower crane comprises an outer clamping plate (10) and an inner clamping plate (20), wherein the outer clamping plate (10) and the inner clamping plate (20) are respectively of L-shaped plate structures, the corners of the outer clamping plate (10) and the corners of the inner clamping plate (20) face the same direction, the outer clamping plate (10) and the inner clamping plate (20) can form a distance for placing tower materials, and a locking mechanism is arranged between the outer clamping plate (10) and the inner clamping plate (20) so as to drive the outer clamping plate (10) and the inner clamping plate (20) to be close to each other; the outer clamping plate (10) is provided with a lifting bracket (31) at the side surface far away from the inner clamping plate (20);

the locking mechanism is a bolt and nut assembly (40), longitudinal strip holes (50) are respectively formed in the end parts of the vertical parts and the transverse parts of the outer clamping plate (10) and the inner clamping plate (20), and the locking mechanism for the bolt and nut assembly (40) penetrates through the strip holes (50) and locks the outer clamping plate (10) and the inner clamping plate (20); the bolt and nut assembly (40) is positioned at the edge end part of the tower material, so that the periphery of the whole tower material can be circumferentially surrounded through the bolt and nut assembly (40), the outer clamping plate (10) and the inner clamping plate (20).

2. The linear cross arm card of claim 1, wherein: a lifting screw rod (32) is arranged on the lifting support (31), a U-shaped placing bayonet (311) is arranged on one side, far away from the inner clamping plate (20), of the lifting support (31), and U-shaped clamping bayonets (312) are respectively arranged at the upper end and the lower end of the lifting support (31); the utility model provides a lifting screw (32) is including lifting sleeve (321), lifting threaded rod (322), clamping lever (323), lifting rotation portion (324) and rotation sleeve (325), rotation sleeve (325) rotate and install in lifting sleeve (321) and establish on lifting threaded rod (322) through threaded connection mode cover, clamping lever (323) radially set up on lifting sleeve (321) relative periphery and lie in U type clamping bayonet socket (312), lifting threaded rod (322) top-down passes U type and places bayonet socket (311), lifting rotation portion (324) are installed on rotation sleeve (325), lifting threaded rod (322) have seted up along axially extending spacing groove (326), lifting sleeve (321) inner wall is provided with spacing arch (327) that lie in spacing groove (326).

3. The straight crossarm card of claim 2, wherein: the opening of the U-shaped clamping bayonet (312) is provided with a clamping mechanism for limiting the clamping rod (323) to go out.

4. A rectilinear cross arm card according to claim 3, characterized in that: the clamping mechanism comprises a rotating rod (331), a positioning rod (332) and a limiting rod (333), wherein the positioning rod (332) and the limiting rod (333) are fixedly arranged on the side surface of the end part of a lifting support (31) where a U-shaped clamping bayonet (312) is arranged and are located on two sides of the U-shaped clamping bayonet (312), an axially extending long groove (334) is formed in one end of the rotating rod (331), an inserting bayonet (335) capable of being inserted into the limiting rod (333) is formed in the other end of the rotating rod (331), and the rotating rod (331) is sleeved on the positioning rod (332) through the long groove (334) to rotate around the positioning rod (332) and move along the direction close to or far away from the limiting rod (333) through the long groove (334).

5. A straight-line cross arm card assembly, characterized in that: comprising two rectilinear cross arm cards according to any one of claims 1 to 4, wherein two inner clamping plates (20) are positioned on one side of each other between the two rectilinear cross arm cards, and a counter-pulling mechanism (60) is further arranged between the two inner clamping plates (20) so as to be capable of driving the two inner clamping plates (20) to be close to each other.

6. The linear cross arm card assembly of claim 5, wherein: the utility model provides a draw mechanism (60) to including first to drawing threaded rod (61), second to drawing threaded rod (62), draw sleeve (63) and to drawing rotation portion (64), first to drawing threaded rod (61) and second to drawing threaded rod (62) one end install on one interior card board (20) through to drawing trunnion (65) respectively, the other end threaded connection is at the both ends of drawing sleeve (63), to drawing rotation portion (64) install on drawing sleeve (63) to make to drawing sleeve (63) rotation through drawing rotation portion (64) drive can realize being close to or keeping away from of two interior card boards (20).

7. The linear cross arm card assembly of claim 6, wherein: the opposite-pulling rotating part (64) is a bidirectional ratchet wrench.

8. The linear cross arm card assembly of claim 6, wherein: the positions of the first counter-pulling threaded rod (61) and the second counter-pulling threaded rod (62) and the counter-pulling trunnion (65) are axially adjustable.