CN111706598A

CN111706598A - Bolt

Info

Publication number: CN111706598A
Application number: CN202010489196.0A
Authority: CN
Inventors: 毛尘
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-06-02
Filing date: 2020-06-02
Publication date: 2020-09-25

Abstract

The invention belongs to the technical field of bolts, and particularly relates to a bolt which comprises a screw rod and a shell, wherein two adjusting modules are designed in the shell, and the shell can be controlled to slide left and right relative to the two screw rods by adjusting the two adjusting modules, so that a frequently used thread area on the two screw rods is changed; the phenomenon of abrasion and slipping caused by long-time use is prevented. The two return springs designed in the invention have the effect that when goods are transported, if a transport vehicle passes through a hollow road surface, the goods can shake, and the two return springs can play a role in buffering. In the working process of the adjusting module, the fourth gear slides in the same direction relative to the screw rod, so that the tensioning force is unchanged in the moving process, and the tensioning effect is not influenced in the adjusting process.

Description

Bolt

Technical Field

The invention belongs to the technical field of bolts, and particularly relates to a bolt.

Background

There is a bolt, it is used for connecting between two strands of stay cords that one end needs interconnect by fixed other end, when using, on being fixed in two couples at two screw rod both ends in the bolt with two strands of stay cord unfixed one end, then rotatory casing, under the screw-thread fit of the fixed cover in casing both ends and two screw rods, two screw rods will be driven and draw close to the centre, draw close the in-process and take-up the stay cord at both ends gradually.

However, after the bolt is used for a long time, the threaded areas frequently used by two screws in the bolt or the threaded matching areas under a certain large pulling force can be worn and slip hidden danger can occur, and although the bolt can be continuously used, the reliability of the bolt for tensioning the pull ropes at two ends can be influenced; particularly, when expensive articles are fixed, if the phenomenon of sliding teeth occurs, the articles can be damaged by sliding, and economic loss is caused; in this case, the screw needs to be replaced, but when in use, the thread matching area is positioned at the inner side, so that the screw is not easy to be perceived, the final thread matching area cannot be predicted in the tightening process, and when in tightening, if the worn thread area is missed, the screw is either screwed or loosened a little, and the effect is not good; therefore, the two screws need to be detached and independently rotated to avoid a worn area or replace a new bolt; however, the common goods need to be supported in advance by an auxiliary tool before being fixed, then are fixed by a pull rope, the supported tool is removed after the pull rope is fixed, if the bolt is worn after the tool is removed, even if the sliding tooth phenomenon does not occur at present, the sliding tooth hidden danger exists later, at the moment, when the bolt is adjusted or replaced, the tool needs to be installed again for supporting, and the operation is troublesome.

The invention designs a bolt which can adjust the worn area of the bolt without reinstalling the auxiliary tool under the condition that the bolt is worn after the auxiliary tool is removed, and solves the problems.

Disclosure of Invention

In order to solve the defects in the prior art, the invention discloses a bolt which is realized by adopting the following technical scheme.

A bolt comprises a screw rod and a shell, wherein two fixed sleeves are symmetrically arranged at two ends of the shell, a hook is arranged at one end of the screw rod, an external thread is arranged at the other end of the screw rod, and the two screws with the external threads in opposite rotation directions pass through

Install the both ends at the casing with the sliding fit of two fixed covers, its characterized in that: two adjusting modules are symmetrically arranged in the shell, an adjusting input module is arranged on one side of the shell, power is input into the two adjusting modules through the adjusting input module, and the two adjusting modules can control the shell to slide relative to the two screw rods through adjusting the two adjusting modules.

The adjusting module comprises a fourth gear and guide rods, wherein the fourth gear is rotatably arranged in the shell through the three guide rods which are uniformly distributed in the circumferential direction, and the fourth gear is in sliding fit with the three guide rods; one end of each guide rod, which is far away from the inner end face of the shell, is provided with a limiting disc for limiting the fourth gear to slip; the inner circular surface of the fourth gear is provided with internal threads, and the fourth gear is in threaded fit with the corresponding screw; the fourth gear is in transmission connection with the adjusting input module.

A return spring is respectively arranged between one end of each of the two fourth gears and the corresponding end surface in the shell; one end of each of the two fourth gears arranged in the shell is fixedly provided with a limit fluted disc; the limiting fluted disc is provided with annular teeth which are uniformly distributed; the shell is provided with two limiting fluted disc sliding locking modules.

The locking module comprises a sliding installation block, a driving screw rod, a first plate spring, a sliding plate, a second plate spring, limiting teeth and a guide shell, wherein the guide shell is fixedly installed in the shell, the sliding installation block is installed in the guide shell in a sliding mode, and the first plate springs which are uniformly distributed are installed between the sliding installation block and the inner end face of the shell; a plurality of limiting teeth are uniformly arranged at two ends of the sliding plate respectively, the sliding plate is slidably arranged in the sliding installation block, and the limiting teeth on the sliding plate are matched with the annular teeth on the two limiting fluted discs respectively; the spacing between the limiting teeth of the sliding plate is equal to the spacing between the annular teeth on the single limiting fluted disc; a second plate spring is respectively arranged between the two ends of the sliding plate and the two inner end surfaces of the sliding installation block; the driving screw rod is installed on the shell in a threaded fit mode, and one end of the driving screw rod extends into the shell and is fixedly connected with the sliding installation block.

As a further improvement of the technology, two end faces in the shell are respectively provided with a T-shaped annular groove, and one end of each of the two groups of guide rods for mounting the two fourth gears, which is not provided with the limiting disc, is respectively and fixedly provided with a mounting ring; one end of each group of guide rods is symmetrically arranged at the two ends in the shell through the rotary matching of the two mounting rings and the two T-shaped ring grooves.

As a further improvement of the present technology, one end of each of the two return springs in the two adjusting modules installed in the housing is fixedly installed on the corresponding fourth gear, and the other end is installed on the corresponding end face in the housing through a thrust bearing.

As a further improvement of the technology, the end surfaces of the two fourth gears are respectively provided with three guide holes which are uniformly distributed and penetrated in the circumferential direction and are in sliding fit with the corresponding three guide rods.

As a further improvement of the technology, one side of the shell is provided with an installation block, the installation block is provided with a clamping groove, and the inner end surface of the clamping groove is provided with an installation hole communicated with the inner side of the shell; one end of the adjusting handle is nested in a clamping groove formed in the mounting block, one end of the telescopic driving rod is fixedly mounted at the lower end of the adjusting handle, and the other end of the telescopic driving rod penetrates through the mounting hole and is positioned in the shell; a return spring is arranged in the telescopic driving shaft; the telescopic driving shaft is in transmission connection with the fourth gear.

As a further improvement of the technology, an installation groove is arranged on the end surface of the shell on the side where the installation block is installed; one end of the telescopic driving rod, which is positioned in the shell, is fixedly provided with a first gear, and the first gear is positioned in the mounting groove; the two mounting rotating shafts are symmetrically mounted in the shell through a fixed support respectively, the two third gears are mounted at one ends of the two mounting rotating shafts respectively, and the two third gears are meshed with the first gear respectively; the two second gears are respectively arranged at the other ends of the two mounting rotating shafts; the two second gears are respectively meshed with the two fourth gears.

As a further improvement of the technology, the telescopic driving shaft comprises a telescopic inner rod, a return spring and a telescopic outer sleeve, wherein one end of the telescopic outer sleeve is fixedly arranged on the adjusting handle, one end of the telescopic inner rod is slidably arranged in the telescopic outer sleeve through the matching of the guide block and the guide groove, and the return spring is arranged between one end of the telescopic inner rod in the telescopic outer sleeve and the inner end surface of the telescopic outer sleeve; the first gear is fixedly arranged at the other end of the telescopic inner rod.

As a further improvement of the technology, one side of the shell is provided with a threaded hole, and the driving screw is installed on the shell through the thread matching with the threaded hole.

As a further improvement of the technology, the inner end surface of the sliding installation block is provided with a trapezoidal guide groove, the sliding plate is provided with a trapezoidal guide block, and the sliding plate is installed in the sliding installation block through the sliding fit of the guide block and the guide groove.

As a further improvement of the technology, the two limiting fluted discs are fixedly arranged at one end of the corresponding fourth gear respectively through connecting sleeves.

Compared with the traditional bolt technology, the bolt has the following beneficial effects:

1. according to the invention, two adjusting modules are designed in the shell, and the shell can be controlled to slide left and right relative to the two screw rods by adjusting the two adjusting modules, so that the thread areas frequently used on the two screw rods are changed; the phenomenon of abrasion and slipping caused by long-time use is prevented.

2. The two return springs designed in the invention have the effect that when goods are transported, if a transport vehicle passes through a hollow road surface, the goods can shake, and the two return springs can play a role in buffering.

3. If the buffering is not needed, the driving screw rod is manually rotated to move towards the inner side of the shell under the action of the threads of the threaded hole, the driving screw rod moves inwards to drive the sliding mounting block to move towards one side close to the two limit fluted discs, the limit teeth on the sliding plate are matched with the annular teeth on the two limit fluted discs in the moving process, and the limit teeth are used for clamping the sliding of the limit fluted discs to play a limiting role.

4. In the working process of the adjusting module, the fourth gear slides in the same direction relative to the screw rod, so that the tensioning force is unchanged in the moving process, and the tensioning effect is not influenced in the adjusting process.

Drawings

Fig. 1 is an external view of an entire part.

Fig. 2 is a schematic view of the overall component distribution.

Fig. 3 is a schematic view of the housing structure.

Fig. 4 is a schematic view of the mounting block and guide housing arrangement.

Fig. 5 is a schematic view of the internal structure of the integral unit.

Fig. 6 is a schematic diagram of the structure of the adjustment input module.

Fig. 7 is a schematic view of a locking module structure.

Figure 8 is a schematic view of a sled installation.

Fig. 9 is a schematic view of the slide mounting block and the slide plate.

Fig. 10 is a schematic view of the structure of the regulating module.

FIG. 11 is a fourth gear mounting schematic.

Fig. 12 is a schematic view of the guide bar installation.

FIG. 13 is a schematic view of the installation of a limiting cog.

Number designation in the figures: 1. a screw; 2. a housing; 3. an adjustment input module; 4. an adjustment module; 5. a locking module; 6. mounting blocks; 7. a threaded hole; 8. fixing a sleeve; 9. a T-shaped ring groove; 10. a card slot; 11. mounting holes; 12. mounting grooves; 13. adjusting the handle; 14. a telescopic drive shaft; 15. a first gear; 16. a telescopic inner rod; 17. a return spring; 18. a telescopic outer sleeve; 19. a sliding mounting block; 20. a drive screw; 21. a first plate spring; 22. a slide plate; 23. a second plate spring; 24. a guide groove; 25. limiting teeth; 26. a second gear; 27. fixing and supporting; 28. installing a rotating shaft; 29. a third gear; 30. a limit fluted disc; 31. a fourth gear; 32. a thrust bearing; 33. a return spring; 35. a guide hole; 37. a guide bar; 38. a mounting ring; 39. a limiting disc; 40. connecting sleeves; 41. a guide block; 42. and a guide housing.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples or figures are illustrative of the present invention and are not intended to limit the scope of the present invention.

As shown in fig. 1 and 2, it includes a screw 1 and a housing 2, wherein as shown in fig. 3 and 4, two fixing sleeves 8 are symmetrically arranged at two ends of the housing 2, as shown in fig. 5 and 10, one end of the screw 1 has a hook, the other end of the screw 1 has an external thread, the two screws 1 with opposite external threads are mounted at two ends of the housing 2 by sliding fit with the two fixing sleeves 8, and it is characterized in that: as shown in fig. 2 and 5, two adjusting modules 4 are symmetrically installed in the housing 2, an adjusting input module 3 is installed at one side of the housing 2, the two adjusting modules 4 input power through the adjusting input module 3, and the housing 2 can be controlled to slide relative to the two screws 1 by adjusting the two adjusting modules 4.

When the bolt is used, firstly, the unfixed ends of the two pull ropes are fixed on two hooks at two ends of two screw rods 1 in the bolt, then the shell 2 is rotated, under the matching of the fourth gears 31 at two ends of the shell 2 and the threads of the two screw rods 1, the two screw rods 1 are driven to be close to the middle, and the pull ropes at two ends are gradually tensioned in the closing process.

In the specific occasion that two pull ropes need to be connected, one bolt is frequently reused, and the length of the two pull ropes is basically kept unchanged in the specific occasion, so that the distance between the two screw rods 1 which need to move towards the middle is also basically kept unchanged when the bolt is used every time, and therefore, the threaded areas of the two screw rods 1 which are frequently used are abraded and have slip hidden danger for a long time, and the reliability of the bolt for tensioning the pull ropes at the two ends is influenced; in order to solve the phenomenon, the two adjusting modules 4 are designed in the shell 2, and the shell 2 can be controlled to slide relative to the two screw rods 1 by adjusting the two adjusting modules 4, so that the frequently used thread areas on the two screw rods 1 are changed; the phenomenon of abrasion and slipping caused by long-time use is prevented.

As shown in fig. 10, the adjusting module 4 includes a fourth gear 31 and a guide rod 37, wherein as shown in fig. 12, the fourth gear 31 is rotatably mounted in the housing 2 through three guide rods 37 uniformly distributed in the circumferential direction, and the fourth gear 31 is in sliding fit with the three guide rods 37; as shown in fig. 12, one end of each of the three guide rods 37, which is far away from the inner end surface of the housing 2, is provided with a limiting disc 39 for limiting the fourth gear 31 from slipping; the inner circular surface of the fourth gear 31 is provided with internal threads, and the fourth gear 31 is in threaded fit with the corresponding screw 1; the fourth gear 31 is in driving connection with the adjustment input module 3.

As shown in fig. 2 and 11, a return spring 33 is respectively installed between one end of each of the two fourth gears 31 and the corresponding end surface in the housing 2; as shown in fig. 13, one end of each of the two fourth gears 31 installed in the housing 2 is fixedly installed with one of the limiting gear discs 30; the limit fluted disc 30 is provided with uniformly distributed annular teeth; the shell 2 is provided with a locking module 5 for limiting the sliding of the two limiting fluted discs 30.

As shown in fig. 7, the locking module 5 includes a sliding mounting block 19, a driving screw 20, a first plate spring 21, a sliding plate 22, a second plate spring 23, a limiting tooth 25, and a guiding shell 42, wherein as shown in fig. 2 and 7, the guiding shell 42 is fixedly mounted in the housing 2, as shown in fig. 8, the sliding mounting block 19 is slidably mounted in the guiding shell 42, and the first plate springs 21 are uniformly distributed between the sliding mounting block 19 and the inner end surface of the housing 2; as shown in fig. 9, a plurality of limiting teeth 25 are respectively and uniformly installed at both ends of the sliding plate 22, as shown in fig. 2 and 5, the sliding plate 22 is slidably installed in the sliding installation block 19, and the limiting teeth 25 on the sliding plate 22 are respectively matched with the annular teeth on the two limiting toothed discs 30; the spacing between the limiting teeth 25 of the sliding plate 22 is equal to the spacing between the annular teeth on the single limiting fluted disc 30; a second plate spring 23 is respectively arranged between the two ends of the sliding plate 22 and the two inner end surfaces of the sliding installation block 19; the driving screw 20 is installed on the housing 2 through thread fit, and one end of the driving screw 20 extends into the housing 2 and is fixedly connected with the sliding installation block 19.

As shown in fig. 4, two T-shaped grooves 9 are respectively formed on two end surfaces in the housing 2, and as shown in fig. 12, one end of each of the two sets of guide rods 37 on which the two fourth gears 31 are mounted, which is not provided with the limiting disc 39, is fixedly provided with a mounting ring 38; as shown in fig. 2, two sets of guide rods 37 are symmetrically mounted at two ends in the housing 2 by two mounting rings 38 in rotation fit with the two T-shaped ring grooves 9. In the invention, when the two fourth gears 31 move in the same direction relative to the two screws 1, the two fourth gears 31 can drive the housing 2 to move together through the limiting discs 39 and the mounting rings 38 on one set of the guide rods 37.

As shown in fig. 10 and 11, one end of each of the two return springs 33 of the two adjustment modules 4 mounted in the housing 2 is fixedly mounted on the corresponding fourth gear 31, and the other end is mounted on the corresponding end face in the housing 2 via a thrust bearing 32. The thrust bearing 32 is arranged to prevent the two return springs 33 and the housing 2 from generating friction force in the rotation direction due to a large pressure to cause a large rotation resistance during the rotation of the two fourth gears 31 relative to the housing 2.

As shown in fig. 13, three guide holes 35 which are uniformly distributed in the circumferential direction and penetrate through the end surfaces of the two fourth gears 31 and are slidably engaged with the corresponding three guide rods 37 are formed in the end surfaces.

As shown in fig. 3 and 4, a mounting block 6 is mounted on one side of the housing 2, a slot 10 is formed on the mounting block 6, and a mounting hole 11 communicated with the inner side of the housing 2 is formed on the inner end surface of the slot 10; as shown in fig. 2, one end of the adjusting handle 13 is nested in the slot 10 formed on the mounting block 6, as shown in fig. 6, one end of the telescopic driving shaft 14 is fixedly mounted at the lower end of the adjusting handle 13, and the other end of the telescopic driving shaft passes through the mounting hole 11 and is located in the housing 2; a return spring 17 is arranged in the telescopic driving shaft 14; the telescopic drive shaft 14 is in driving connection with a fourth gear 31.

As shown in fig. 4, the end surface of the housing 2 on the side where the mounting block 6 is mounted is provided with a mounting groove 12; as shown in fig. 6, a first gear 15 is fixedly installed at one end of the telescopic driving rod located in the housing 2, and the first gear 15 is located in the installation groove 12; as shown in fig. 5 and 10, two mounting shafts 28 are symmetrically mounted in the housing 2 through a fixed support 27, two third gears 29 are mounted at one end of the two mounting shafts 28, and the two third gears 29 are engaged with the first gear 15; two second gears 26 are respectively arranged at the other ends of the two mounting rotating shafts 28; the two second gears 26 are respectively meshed with the two fourth gears 31.

As shown in fig. 6, the telescopic driving shaft 14 includes a telescopic inner rod 16, a return spring 17, and a telescopic outer sleeve 18, wherein one end of the telescopic outer sleeve 18 is fixedly mounted on the adjusting handle 13, one end of the telescopic inner rod 16 is slidably mounted in the telescopic outer sleeve 18 through the cooperation of the guide block 41 and the guide groove 24, and the return spring 17 is mounted between one end of the telescopic inner rod 16 located in the telescopic outer sleeve 18 and the inner end surface of the telescopic outer sleeve 18; the first gear 15 is fixedly mounted on the other end of the telescopic inner rod 16. The return spring 17 is used for tightly clamping one end of the adjusting handle 13 in the clamping groove 10 through the return spring 17 when the adjusting is not performed or after the adjusting is completed, and limiting the adjusting handle 13 through the clamping groove 10.

As shown in fig. 4, a screw hole 7 is opened in one side of the housing 2, and as shown in fig. 2, a drive screw 20 is attached to the housing 2 by screw-fitting with the screw hole 7.

As shown in fig. 8, the inner end surface of the slide mounting block 19 is provided with a trapezoidal guide groove 24, the slide plate 22 is provided with a trapezoidal guide block 41, and the slide plate 22 is mounted in the slide mounting block 19 by the sliding fit of the guide block 41 and the guide groove 24.

As shown in fig. 13, two of the limiting gear discs 30 are fixedly mounted at one end of the corresponding fourth gear 31 through a connecting sleeve 40.

The two return springs 33 designed in the invention have the function that when goods are transported, if a transport vehicle passes through a pothole road surface, the goods can shake, and the two return springs 33 can play a role in buffering. In the invention, if buffering is not needed, the driving screw 20 is manually rotated, so that the driving screw 20 moves towards the inner side of the shell 2 under the action of the threads of the threaded hole 7, the driving screw 20 moves inwards to drive the sliding mounting block 19 to move towards one side close to the two limit fluted discs 30, if the limit fluted discs 25 and the annular teeth on the limit fluted discs 30 are staggered in the moving process, the annular teeth on the limit fluted discs 30 and the limit fluted discs 25 are mutually extruded, the second plate spring 23 interacts with the return spring 33, and finally the limit fluted teeth 25 on the sliding plate 22 are matched with the annular teeth on the two limit fluted discs 30, and the limit fluted discs 30 are slidably clamped through the limit teeth 25 to play a limiting role; the limit of the limit rack and the limit fluted disc 30 is generally adjusted before the use of the turn buckle, because the turn buckle does not bear the pulling force at the moment, the limit process is easy to adjust, if the limit is adjusted in the working process of the turn buckle, the extrusion force of the limit teeth 25 and the limit gear is extremely large due to the transitional compression of the return spring 33, the adjustment requires a large force, and the limit is extremely easy to wear in the extrusion process. The spacing of the limiting teeth 25 of the sliding plate 22 is equal to the spacing of the annular teeth on the single limiting fluted disc 30, so that the annular teeth on the two limiting toothed rings are limited by the sliding plate 22 after the sliding plate 22 is limited.

The first leaf spring 21 and the second leaf spring 23 are designed to act as a return for the slide mounting block 19 and the slide plate 22.

The fourth gear 31 of the present invention is designed to have a strength greater than that of the screw 1, and is designed to be damaged by the screw 1 rather than the fourth gear 31; when the screw rod 1 is replaced, only the screw rod needs to be replaced.

The specific working process is as follows: when the bolt designed by the invention is used, firstly, the unfixed ends of the two pull ropes are fixed on two hooks at two ends of two screw rods 1 in the bolt, then the shell 2 is rotated, the shell 2 rotates to drive two mounting rotating shafts 28 which are arranged at the inner sides of the shell through fixed supports 27 to rotate, the two mounting rotating shafts 28 rotate to drive two second gears 26 to rotate, the two second gears 26 rotate to drive two fourth gears 31 to rotate, and because the pull ropes at two ends are in a loose state, the two fourth gears 31 rotate to drive the two screw rods 1 to approach to the middle, and further the pull ropes at two ends are tensioned.

After fixing, if the threaded matching area of the screw 1 and the fourth gear 31 needs to be changed, the adjusting handle 13 is lifted to be separated from the clamping groove 10 on the mounting block 6, then the adjusting handle 13 is rotated, the adjusting handle 13 drives the first gear 15 to rotate through the telescopic driving shaft 14, the first gear 15 rotates to drive the two third gears 29 to rotate, the two third gears 29 rotate to drive the two mounting rotating shafts 28 to rotate, the two mounting rotating shafts 28 rotate to drive the two second gears 26 to rotate, and the two second gears 26 rotate to drive the two fourth gears 31 to rotate. In the invention, because the rotation directions of the two third gears 29 are opposite, namely the rotation directions of the two fourth gears 31 are opposite through the transmission of the two mounting rotating shafts 28 and the two second gears 26, and the thread directions of the two screws 1 are opposite, and the thread directions on the inner circular surfaces of the two fourth gears 31 which are in thread fit with the two screws 1 are also opposite, when the two fourth gears 31 are driven to rotate in opposite directions and the two screws 1 are tightened, under the action of the two screws 1, the two fourth gears 31 move in the same direction relative to the two screws 1, and the two fourth gears 31 move to drive the shell 2 to move through the two groups of guide rods 37; so that the area where the screw 1 and the fourth gear 31 are engaged is changed; finally, the adjusting handle 13 is clamped in the clamping groove 10 on the mounting block 6, one end of the adjusting handle 13 is tightly clamped in the clamping groove 10 under the action of the return spring 17, and the adjusting handle 13 is prevented from being stressed to rotate reversely to influence the tension of the pull ropes at two ends; because the adjusting handle 13 needs to be clamped in the clamping groove 10 after the adjustment is completed and limited by the clamping groove 10, the two fourth gears 31 move relative to the screw rod 1 at intervals, and the rotation of 180 degrees of the adjusting handle 13 is taken as a unit.

Claims

1. The utility model provides a bolt, it includes screw rod, casing, wherein the both ends symmetry of casing have two fixed covers, and the one end of screw rod has the couple, and the other end of screw rod has the external screw thread, and two external screw threads revolve to opposite screw rod through the sliding fit who installs at the both ends of casing with two fixed covers, its characterized in that: two adjusting modules are symmetrically arranged in the shell, an adjusting input module is arranged on one side of the shell, power is input into the two adjusting modules through the adjusting input module, and the shell can be controlled to slide relative to the two screw rods by adjusting the two adjusting modules;

the adjusting module comprises a fourth gear and guide rods, wherein the fourth gear is rotatably arranged in the shell through the three guide rods which are uniformly distributed in the circumferential direction, and the fourth gear is in sliding fit with the three guide rods; one end of each guide rod, which is far away from the inner end face of the shell, is provided with a limiting disc for limiting the fourth gear to slip; the inner circular surface of the fourth gear is provided with internal threads, and the fourth gear is in threaded fit with the corresponding screw; the fourth gear is in transmission connection with the adjusting input module;

a return spring is respectively arranged between one end of each of the two fourth gears and the corresponding end surface in the shell; one end of each of the two fourth gears arranged in the shell is fixedly provided with a limit fluted disc; the limiting fluted disc is provided with annular teeth which are uniformly distributed; the shell is provided with a locking module for limiting the sliding of the two limiting fluted discs;

2. A bolt according to claim 1, wherein: two end faces in the shell are respectively provided with a T-shaped annular groove, and one end of each of the two groups of guide rods for mounting the two fourth gears, which is not provided with the limiting disc, is respectively and fixedly provided with a mounting ring; one end of each group of guide rods is symmetrically arranged at the two ends in the shell through the rotary matching of the two mounting rings and the two T-shaped ring grooves.

3. A bolt according to claim 1, wherein: one end of each of the two return springs in the two adjusting modules arranged in the shell is fixedly arranged on the corresponding fourth gear, and the other end of each of the two return springs is arranged on the corresponding end face in the shell through a thrust bearing.

4. A bolt according to claim 1, wherein: the end surfaces of the two fourth gears are respectively provided with three guide holes which are uniformly distributed and run through in the circumferential direction and are in sliding fit with the corresponding three guide rods.

5. A bolt according to claim 1, wherein: a mounting block is mounted on one side of the shell, a clamping groove is formed in the mounting block, and a mounting hole communicated with the inner side of the shell is formed in the inner end face of the clamping groove; one end of the adjusting handle is nested in a clamping groove formed in the mounting block, one end of the telescopic driving rod is fixedly mounted at the lower end of the adjusting handle, and the other end of the telescopic driving rod penetrates through the mounting hole and is positioned in the shell; a return spring is arranged in the telescopic driving shaft; the telescopic driving shaft is in transmission connection with the fourth gear.

6. A bolt according to claim 5, wherein: the end surface of the shell on one side provided with the mounting block is provided with a mounting groove; one end of the telescopic driving rod, which is positioned in the shell, is fixedly provided with a first gear, and the first gear is positioned in the mounting groove; the two mounting rotating shafts are symmetrically mounted in the shell through a fixed support respectively, the two third gears are mounted at one ends of the two mounting rotating shafts respectively, and the two third gears are meshed with the first gear respectively; the two second gears are respectively arranged at the other ends of the two mounting rotating shafts; the two second gears are respectively meshed with the two fourth gears.

7. A bolt according to claim 6, wherein: the telescopic driving shaft comprises a telescopic inner rod, a return spring and a telescopic outer sleeve, wherein one end of the telescopic outer sleeve is fixedly arranged on the adjusting handle, one end of the telescopic inner rod is slidably arranged in the telescopic outer sleeve through the matching of the guide block and the guide groove, and the return spring is arranged between one end of the telescopic inner rod positioned in the telescopic outer sleeve and the inner end surface of the telescopic outer sleeve; the first gear is fixedly arranged at the other end of the telescopic inner rod.

8. A bolt according to claim 1, wherein: one side of the shell is provided with a threaded hole, and the driving screw rod is installed on the shell through the thread matching with the threaded hole.

9. A bolt according to claim 1, wherein: the inner end surface of the sliding installation block is provided with a trapezoidal guide groove, the sliding plate is provided with a trapezoidal guide block, and the sliding plate is arranged in the sliding installation block through the sliding fit of the guide block and the guide groove.

10. A bolt according to claim 1, wherein: and the two limiting fluted discs are fixedly arranged at one end of the corresponding fourth gear respectively through connecting sleeves.