CN114382309B

CN114382309B - Protector is used to building engineering safety

Info

Publication number: CN114382309B
Application number: CN202210157610.7A
Authority: CN
Inventors: 胡士克; 柴春风
Original assignee: Jiaotong Railway Inspection And Certification Laboratory Chengdu Co ltd
Current assignee: Jiaotong Railway Inspection And Certification Laboratory Chengdu Co ltd
Priority date: 2022-02-21
Filing date: 2022-02-21
Publication date: 2023-01-17
Anticipated expiration: 2042-02-21
Also published as: CN114382309A

Abstract

The invention discloses a protective device for building engineering safety, which comprises a main net, wherein the top and the bottom of the back surface of the main net are respectively provided with a bearing seat I and a bearing seat II, the bearing seat I and the bearing seat II are respectively provided with a top shaft and a bottom shaft, and the top shaft and the bottom shaft are respectively provided with a longitudinal positioning top plate and a longitudinal positioning bottom plate.

Description

Protector is used to building engineering safety

Technical Field

The invention relates to the technical field of buildings, in particular to a protective device for building engineering safety.

Background

The building engineering refers to an engineering entity formed by the construction of various building buildings and their auxiliary facilities and the installation of lines, pipes and equipment matched with them, wherein the building buildings refer to the engineering which has top covers, beams, columns, walls, foundations and can form internal spaces and meet the requirements of people for production, living, study and public activities.

In the building engineering work progress, the elevartor shaft is as the well of every building installation elevator, is the interim facility of construction, in order to avoid the potential safety hazard that the high altitude falls, in whole building work progress, must all shelter from the protection to the elevartor shaft.

The protection of present elevartor shaft is mostly all utilized netted rail to realize, nevertheless in the construction process, need punch to the elevartor shaft periphery, and by the wall-piercing bolted connection shaping, it is inconvenient to lead to the fixed butt joint of rail when the elevartor shaft position is protected, its whole process is consuming time power not only, and the metal otter board of adorning is difficult for demolising, need consume a large amount of manpower and materials after follow-up engineering finishes and handle rail and wall body, also seriously influence the engineering time limit for a project, for this reason, we propose a protector for building engineering safety.

Disclosure of Invention

The invention aims to provide a protective device for building engineering safety, which solves the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: a protective device for building engineering safety comprises a main net, wherein a first bearing seat and a second bearing seat are respectively arranged at the top and the bottom of the back surface of the main net, a top shaft and a bottom shaft are respectively arranged on the first bearing seat and the second bearing seat, and a longitudinal positioning top plate and a longitudinal positioning bottom plate are respectively arranged on the top shaft and the bottom shaft;

the main net is also provided with a synchronous connecting piece which is simultaneously connected with a top shaft and a bottom shaft and drives the top shaft and the bottom shaft to synchronously and reversely rotate so as to transfer the longitudinal positioning top plate and the longitudinal positioning bottom plate into the elevator shaft;

and a transverse positioning component is arranged on the longitudinal positioning bottom plate and is connected with a synchronous connecting piece, and when the synchronous connecting piece drives the top shaft and the bottom shaft to rotate, the transverse positioning component is driven to transversely position the longitudinal positioning bottom plate in the elevator shaft so as to install the main net at the position of the elevator shaft.

Preferably, the synchronous connecting piece comprises a rotating main shaft arranged on the front surface of the main net, a vertical extension shaft is arranged on the rotating main shaft, a deflection handle is rotatably arranged at the end part of the extension shaft, and a limiting component for limiting the rotation of the deflection handle is arranged on the main net;

the main network front side connecting device is characterized by also comprising a third bearing seat and a fourth bearing seat which are respectively arranged at the top and the bottom of the front side of the main network, wherein a first linkage shaft and a second linkage shaft are respectively arranged on the third bearing seat and the fourth bearing seat, and a first gear and a second gear are respectively arranged on the first linkage shaft and the second linkage shaft;

through grooves are formed in the positions of the first gear and the second gear on the main net in a penetrating mode, a first linkage wheel and a second linkage wheel are arranged on the top shaft and the bottom shaft respectively, and the first linkage wheel and the second linkage wheel penetrate through the through grooves and are meshed with the first gear and the second gear respectively;

and the main net is also provided with a linkage component which is used for connecting the rotating main shaft with the first linkage shaft and the second linkage shaft and driving the first linkage shaft and the second linkage shaft to synchronously rotate reversely when the rotating main shaft is rotated.

Preferably, a rubber outer sleeve is rotatably mounted on the outer side of the deflecting handle.

Preferably, the limiting part comprises two oppositely arranged folded plates, the two folded plates are hinged on the main net so as to clamp the extension shaft between the two folded plates, through holes penetrating through the end parts of the two folded plates are arranged at the end parts of the two folded plates, and a lock is arranged in the through holes on the two folded plates.

Preferably, the linkage part comprises a first bevel gear arranged on the rotating main shaft, bearing seats five are arranged at the positions, above and below the rotating main shaft, of the main network, transmission shafts are arranged on the bearing seats five, second bevel gears are arranged at one ends, close to the rotating main shaft, of the transmission shafts, the two second bevel gears are meshed with the first bevel gear and are respectively positioned right above and right below the first bevel gear;

the linkage mechanism is characterized by further comprising third bevel gears respectively arranged at the other ends of the two transmission shafts, and a fourth bevel gear and a fifth bevel gear are respectively arranged on the first linkage shaft and the second linkage shaft and are meshed with the third bevel gears, and the fourth bevel gear and the fifth bevel gear are respectively positioned on two sides of the third bevel gear, so that the first linkage shaft and the second linkage shaft synchronously and reversely rotate.

Preferably, the transverse positioning component comprises a bearing seat six arranged at the end part of the longitudinal positioning bottom plate, a linkage shaft three is arranged on the bearing seat six, and a longitudinal plate one is arranged on the linkage shaft three;

a bearing seat seventh is further arranged at one end, far away from the bearing seat sixth, of the longitudinal positioning bottom plate, a linkage shaft IV is arranged on the bearing seat seventh, a longitudinal plate II is arranged on the linkage shaft IV, the linkage shaft III is parallel to the linkage shaft IV, and when the linkage shaft III and the linkage shaft IV are deflected, the longitudinal plate I and the longitudinal plate II are driven to deflect and abut against the side wall of the elevator shaft

The driving mechanism is characterized by further comprising a first driving part arranged between the third linkage shaft and the bottom shaft, wherein the third linkage shaft is driven to rotate when the bottom shaft drives the longitudinal positioning bottom plate to rotate, a second driving part is arranged between the first driving part and the fourth linkage shaft, and when the first driving part is utilized to drive the third linkage shaft to rotate, the fourth linkage shaft is driven to rotate reversely.

Preferably, the first transmission part comprises a third gear arranged on a second linkage shaft, a rotating shaft is arranged in the through groove, a fourth gear meshed with the third gear is arranged on the rotating shaft, a fifth gear meshed with the fourth gear is arranged on the bottom shaft, the fifth gear is rotatably arranged on the bottom shaft, the length of the fifth gear is greater than that of the fourth gear, a first chain wheel is arranged on the side edge of the fifth gear, and the first chain wheel is rotatably connected with the bottom shaft;

the linkage mechanism is characterized by further comprising a second chain wheel arranged at the three end part of the linkage shaft, and a first chain is arranged on the outer side of the second chain wheel and the outer side of the first chain wheel so as to be in transmission connection with the first chain wheel and the second chain wheel, so that the linkage shaft is driven to rotate when the second linkage shaft rotates.

Preferably, the second transmission part comprises a third chain wheel arranged at the four end parts of the linkage shaft, the third chain wheel is rotatably connected with the fourth linkage shaft, the first chain rounds from the outer side of the third chain wheel and is occluded with the third chain wheel, six gears are arranged at the three side positions of the first chain wheel, and the six gears are also rotatably connected with the fourth linkage shaft;

the vertical positioning base plate is characterized by further comprising a bearing seat eight arranged on the vertical positioning base plate, a linkage shaft five is arranged on the bearing seat eight, a gear seven meshed with a gear six is arranged at one end of the linkage shaft five, a gear eight is arranged at the other end of the linkage shaft five, a gear nine is arranged on the linkage shaft four, a chain two is arranged on the outer sides of the gear nine and the gear eight, and then the linkage shaft four and the linkage shaft three are synchronously driven to rotate reversely when the chain one rotates.

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

the elevator shaft protection device is different from the prior art, when the elevator shaft is protected during construction, the longitudinal positioning top plate and the longitudinal positioning bottom plate can be directly turned into the elevator shaft by utilizing the synchronous connecting piece, and the longitudinal positioning top plate and the longitudinal positioning bottom plate are respectively contacted with the top and the bottom of the elevator opening at the position to limit the main network from moving up and down;

the utility model discloses a safety protection device for elevator shaft, including the elevator shaft, the elevator shaft is equipped with the vertical location bottom plate, the vertical location bottom plate is equipped with the vertical location roof, the vertical location roof is equipped with the vertical location roof and is equipped with the vertical location bottom plate, the vertical location roof is equipped with the vertical location roof and the vertical location bottom plate is equipped with the vertical location roof and is equipped with the vertical location bottom plate, the vertical location roof is equipped with the vertical location roof and is equipped with the vertical location roof, the vertical location roof is equipped with the vertical location roof and is equipped with the vertical location roof.

Drawings

FIG. 1 is a schematic view of the overall contracted state of the present invention;

FIG. 2 is a schematic view of another orientation of the present invention shown in FIG. 1;

FIG. 3 is an enlarged view of a portion of FIG. 1 according to the present invention;

FIG. 4 is an enlarged view of a portion of FIG. 2 according to the present invention;

FIG. 5 is a schematic view of a structure of a transmission part of the present invention;

FIG. 6 is a schematic structural view of a second transmission component of the present invention;

FIG. 7 is a schematic view of the present invention in an overall extended and secured state;

fig. 8 is a schematic view of the invention of fig. 7 in an installed condition in a hoistway.

In the figure: 1. a main network; 11. a first bearing seat; 12. a second bearing seat; 13. a top shaft; 14. a bottom shaft; 15. longitudinally positioning a top plate; 16. longitudinally positioning the bottom plate; 2. a synchronous connection; 21. rotating the main shaft; 22. an extension shaft; 23. a deflection handle; 231. a rubber outer sleeve ring; 24. a regulating member; 241. folding a plate; 242. a through hole; 243. a lock; 25. a third bearing seat; 26. a fourth bearing seat; 27. a first linkage shaft; 28. a second linkage shaft; 29. a first gear; 210. a second gear; 211. a through groove; 212. a first linkage wheel; 213. a second linkage wheel; 3. a lateral positioning member; 31. a bearing seat six; 32. a third linkage shaft; 33. a first vertical plate; 34. a seventh bearing seat; 35. a fourth linkage shaft; 36. a second longitudinal plate; 4. a linking member; 41. a first bevel gear; 42. a fifth bearing seat; 43. a drive shaft; 44. a second bevel gear; 45. a third bevel gear; 46. a fourth bevel gear; 47. a fifth bevel gear; 5. a first transmission component; 51. a third gear; 52. a rotating shaft; 53. a fourth gear; 54. a fifth gear; 55. a chain wheel I; 56. a second chain wheel; 57. a first chain; 6. a second transmission component; 61. a third chain wheel; 62. a sixth gear; 63. a bearing seat eight; 64. a fifth linkage shaft; 65. a seventh gear; 66. a eighth gear; 67. a ninth gear; 68. and a second chain.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-8, the present invention provides a technical solution: a protective device for building engineering safety comprises a main net 1, wherein a first bearing seat 11 and a second bearing seat 12 are respectively arranged at the top and the bottom of the back of the main net 1, a top shaft 13 and a bottom shaft 14 are respectively arranged on the first bearing seat 11 and the second bearing seat 12, and a longitudinal positioning top plate 15 and a longitudinal positioning bottom plate 16 are respectively arranged on the top shaft 13 and the bottom shaft 14;

the main net 1 is also provided with a synchronous connecting piece 2, the synchronous connecting piece 2 is simultaneously connected with the top shaft 13 and the bottom shaft 14 and drives the top shaft 13 and the bottom shaft 14 to synchronously and reversely rotate, and the longitudinal positioning top plate 15 and the longitudinal positioning bottom plate 16 are transferred into an elevator shaft;

and a transverse positioning component 3 is arranged on the longitudinal positioning bottom plate 16, the transverse positioning component 3 is connected with the synchronous connecting piece 2, and when the synchronous connecting piece 2 drives the top shaft 13 and the bottom shaft 14 to rotate, the transverse positioning component 3 is driven to transversely position the longitudinal positioning bottom plate 16 in the elevator shaft so as to install the main net 1 at the position of the elevator shaft.

Compared with the prior art, when the construction protection is carried out on the elevator shaft, the longitudinal positioning top plate 15 and the longitudinal positioning bottom plate 16 can be directly turned into the elevator shaft by using the synchronous connecting piece 2, and the longitudinal positioning top plate 15 and the longitudinal positioning bottom plate 16 are respectively contacted with the top and the bottom of the elevator opening at the position to limit the main network 1 from moving up and down;

meanwhile, the transverse positioning component 3 is unfolded to transversely position the longitudinal positioning bottom plate 16, the longitudinal positioning top plate 15 and the longitudinal positioning bottom plate 16 are pulled out from the elevator shaft by limiting the main net 1, the main net 1 can be directly installed in the elevator shaft position for safety protection, the whole process has no extra engineering construction, and after the engineering is finished, the synchronous connecting component 2 is directly arranged to shrink and reset all the components, the elevator shaft protecting component can be detached, the structure is ingenious, the dismounting and mounting are simple, the safety protection can be conveniently carried out, and the construction period of the engineering can be effectively prolonged.

As an embodiment, the synchronous connecting piece 2 comprises a rotating main shaft 21 arranged on the front surface of the main net 1, a vertical extension shaft 22 is arranged on the rotating main shaft 21, a deflection handle 23 is rotatably arranged at the end part of the extension shaft 22, when in construction, the deflection handle 23 is rotated to be vertical to the extension shaft 22, namely the rotating main shaft 21 can be conveniently arranged to rotate, in addition, the deflection handle 23 can provide a certain positioning function for the deflection handle 23 by using rubber or a matching mode of concave and convex opposite surfaces, so that the deflection handle 23 and the extension shaft 22 are kept at a relatively vertical position, and the convenient rotation use is ensured;

the main net 1 is provided with a limiting part 24 for limiting the rotation of the deflection handle 23, as an embodiment, the limiting part 24 comprises two folded plates 241 which are oppositely arranged, the two folded plates 241 are both hinged on the main net 1 and are of a bending structure matched with the extension shaft 22, so that the extension shaft 22 is clamped between the two folded plates 241, the end parts of the two folded plates 241 are both provided with through holes 242 which penetrate through, and lock devices 243 are arranged in the through holes 242 on the two folded plates 241, so that in the actual use process, only one lock device 243 is needed to ensure that the rotation main shaft 21 cannot be maliciously rotated by people, and the rotation main shaft 21 cannot be rotated to ensure that the main net 1 can be stably protected at an elevator entrance;

the synchronous connecting piece 2 further comprises a third bearing seat 25 and a fourth bearing seat 26 which are respectively arranged at the top and the bottom of the front surface of the main net 1, a first linkage shaft 27 and a second linkage shaft 28 are respectively arranged on the third bearing seat 25 and the fourth bearing seat 26, and a first gear 29 and a second gear 210 are respectively arranged on the first linkage shaft 27 and the second linkage shaft 28;

through grooves 211 are formed in the positions of the first gear 29 and the second gear 210 on the main network 1, a first linkage wheel 212 and a second linkage wheel 213 are respectively arranged on the top shaft 13 and the bottom shaft 14, and the first linkage wheel 212 and the second linkage wheel 213 both penetrate through the through grooves 211 and are respectively meshed with the first gear 29 and the second gear 210;

the main net 1 is further provided with a linkage part 4, as an embodiment, the linkage part 4 comprises a first bevel gear 41 arranged on the rotating main shaft 21, bearing seats five 42 are arranged above and below the rotating main shaft 21 on the main net 1, transmission shafts 43 are arranged on the bearing seats five 42, one ends of the transmission shafts 43 close to the rotating main shaft 21 are provided with second bevel gears 44, and the two second bevel gears 44 are meshed with the first bevel gear 41 and are respectively arranged right above and right below the first bevel gear 41;

the linkage part 4 further comprises a third bevel gear 45 respectively arranged at the other ends of the two transmission shafts 43, a fourth bevel gear 46 and a fifth bevel gear 47 are respectively arranged on the first linkage shaft 27 and the second linkage shaft 28, the fourth bevel gear 46 and the fifth bevel gear 47 are meshed with the third bevel gear 45, and the fourth bevel gear 46 and the fifth bevel gear 47 are respectively positioned at two sides of the third bevel gear 45, so that the first linkage shaft 27 and the second linkage shaft 28 synchronously and reversely rotate.

The above feature is that when the main network 1 is installed for longitudinal positioning, the rotating main shaft 21 is set to rotate and driven by the first bevel gear 41 and the second bevel gear 44 (the two second bevel gears 44 are respectively located above and below the first bevel gear 41, so that when the first bevel gear 41 rotates, the two second bevel gears 44 rotate synchronously and reversely), so as to drive the upper and lower transmission shafts 43 to rotate synchronously and reversely;

and under the action of the third bevel gear 45, the fourth bevel gear 46 and the fifth bevel gear 47, the first linkage shaft 27 and the second linkage shaft 28 are driven to synchronously rotate in opposite directions, and then under the action of the first gear 29, the second gear 210, the first linkage wheel 212 and the second linkage wheel 213, the top shaft 13 and the bottom shaft 14 are driven to synchronously rotate in opposite directions, so that the longitudinal positioning top plate 15 and the longitudinal positioning bottom plate 16 are simultaneously turned on one side and are flush with the top end and the bottom end of the main net 1, and the main net 1 is longitudinally positioned in the elevator shaft.

Furthermore, a rubber outer sleeve 231 is rotatably mounted on the outer side of the deflection handle 23, so that the rubber outer sleeve 231 can be effectively and conveniently driven to rotate in the engineering construction process.

As an embodiment, the transverse positioning component 3 comprises a bearing seat six 31 arranged at the end part of the longitudinal positioning bottom plate 16, a linkage shaft three 32 is arranged on the bearing seat six 31, and a longitudinal plate one 33 is arranged on the linkage shaft three 32;

a bearing seat seventh 34 is further arranged at one end, far away from the bearing seat sixth 31, of the longitudinal positioning bottom plate 16, a linkage shaft fourth 35 is arranged on the bearing seat seventh 34, a longitudinal plate second 36 is arranged on the linkage shaft fourth 35, the linkage shaft third 32 is parallel to the linkage shaft fourth 35, and when the linkage shaft third 32 and the linkage shaft fourth 35 are deflected, the longitudinal plate first 33 and the longitudinal plate second 36 are driven to deflect and are abutted against the side wall of the elevator shaft, so that the longitudinal positioning bottom plate 16 is transversely positioned, and the main shaft 1 is prevented from being pulled to be pulled into the elevator shaft;

the transverse positioning component 3 further comprises a first transmission component 5 arranged between the third linkage shaft 32 and the bottom shaft 14, as an embodiment, the first transmission component 5 comprises a third gear 51 arranged on the second linkage shaft 28, a rotating shaft 52 is arranged in the through groove 211, a fourth gear 53 meshed with the third gear 51 is arranged on the rotating shaft 52, a fifth gear 54 meshed with the fourth gear 53 is arranged on the bottom shaft 14, the fifth gear 54 is rotatably installed on the bottom shaft 14 and is longer than the fourth gear 53, a first chain wheel 55 is arranged at the side position of the fifth gear 54, the first chain wheel 55 is also rotatably connected with the bottom shaft 14, and by utilizing the design, when the fourth linkage shaft 35 rotates, the fifth gear 54 and the bottom shaft 14 are driven to synchronously and reversely rotate through the transmission of the fourth gear 53, so that the first chain wheel 55 and the bottom shaft 14 are driven to forcibly rotate in a staggered manner;

the first transmission part 5 further comprises a second chain wheel 56 arranged at the end part of the third linkage shaft 32, and a first chain 57 is arranged on the outer sides of the second chain wheel 56 and the first chain wheel 55 so as to drive the first chain wheel 55 and the second chain wheel 56 to be connected in a transmission manner, so that the third linkage shaft 32 is driven to rotate when the second linkage shaft 28 rotates, and the first longitudinal plate 33 is driven to rotate and open so as to abut against the side wall of the elevator shaft;

a second transmission part 6 is further arranged between the first transmission part 5 and the fourth linkage shaft 35, as an embodiment, the second transmission part 6 comprises a third chain wheel 61 arranged at the end part of the fourth linkage shaft 35, the third chain wheel 61 is rotationally connected with the fourth linkage shaft 35, a first chain 57 rounds the outer side of the third chain wheel 61 and is meshed with the third chain wheel, a sixth gear 62 is arranged at the side edge of the third chain wheel 61, and the sixth gear 62 is also rotationally connected with the fourth linkage shaft 35;

the transmission component II 6 further comprises a bearing seat eight 63 arranged on the longitudinal positioning bottom plate 16, a linkage shaft five 64 is arranged on the bearing seat eight 63, a gear seven 65 meshed with the gear six 62 is arranged at one end of the linkage shaft five 64, a gear eight 66 is arranged at the other end of the linkage shaft five 64, a gear nine 67 is arranged on the linkage shaft four 35, a chain two 68 is arranged outside the gear nine 67 and the gear eight 66, the linkage shaft four 35 and the linkage shaft three 32 are driven to synchronously and reversely rotate when the chain one 57 rotates, and then the longitudinal plate two 36 is synchronously turned and opened, so that the longitudinal positioning bottom plate 16 is limited in the elevator shaft through the longitudinal plate one 33 and the longitudinal plate two 36, the main shaft 1 is ensured to be immovable in the elevator shaft position, and the main shaft 1 can be ensured not to be moved randomly only by not opening the lock 243, and the elevator shaft can be stably protected and used.

It should be noted that through the use of the longitudinal positioning bottom plate 16, the elevator shaft can be isolated and protected at each floor, and in this state, building fragments or building tools falling down carelessly at each floor can be shielded and stored by the longitudinal positioning bottom plate 16, so that the situation that the building fragments or building tools fall down carelessly at each floor are thrown out from the elevator shaft to injure people due to irregular collision in the continuous falling process is avoided, and the safety of the building fragments or building tools is further ensured;

and both ends of the main net 1 are provided with extension plates, so that when the main net 1 is flatly laid on the ground, the extension plates are used for contacting the ground, and the contact abrasion between the ground and each gear is avoided.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a safety protection device for building engineering, includes major network (1), its characterized in that: a first bearing seat (11) and a second bearing seat (12) are respectively arranged at the top and the bottom of the back surface of the main net (1), a top shaft (13) and a bottom shaft (14) are respectively arranged on the first bearing seat (11) and the second bearing seat (12), and a longitudinal positioning top plate (15) and a longitudinal positioning bottom plate (16) are respectively arranged on the top shaft (13) and the bottom shaft (14);

a synchronous connecting piece (2) is arranged on the main net (1), the synchronous connecting piece (2) is simultaneously connected with a top shaft (13) and a bottom shaft (14) and drives the top shaft (13) and the bottom shaft (14) to synchronously and reversely rotate, and the longitudinal positioning top plate (15) and the longitudinal positioning bottom plate (16) are shifted into an elevator shaft;

and a transverse positioning component (3) is arranged on the longitudinal positioning bottom plate (16), the transverse positioning component (3) is connected with the synchronous connecting piece (2), and when the synchronous connecting piece (2) drives the top shaft (13) and the bottom shaft (14) to rotate, the transverse positioning component (3) is driven to transversely position the longitudinal positioning bottom plate (16) in the elevator shaft so as to install the main net (1) at the position of the elevator shaft.

2. A safety guard for construction engineering according to claim 1, wherein: the synchronous connecting piece (2) comprises a rotating main shaft (21) arranged on the front surface of the main net (1), a vertical extending shaft (22) is arranged on the rotating main shaft (21), a deflection handle (23) is rotatably arranged at the end part of the extending shaft (22), and a limiting part (24) used for limiting the rotation of the deflection handle (23) is arranged on the main net (1);

the main net is characterized by further comprising a third bearing seat (25) and a fourth bearing seat (26) which are respectively arranged at the top and the bottom of the front face of the main net (1), wherein a first linkage shaft (27) and a second linkage shaft (28) are respectively arranged on the third bearing seat (25) and the fourth bearing seat (26), and a first gear (29) and a second gear (210) are respectively arranged on the first linkage shaft (27) and the second linkage shaft (28);

through grooves (211) penetrating through the positions of the first gear (29) and the second gear (210) on the main network (1) are formed, a first linkage wheel (212) and a second linkage wheel (213) are respectively arranged on the top shaft (13) and the bottom shaft (14), and the first linkage wheel (212) and the second linkage wheel (213) penetrate through the through grooves (211) and are respectively meshed with the first gear (29) and the second gear (210);

and a linkage component (4) is further arranged on the main net (1), the linkage component (4) is used for connecting the rotating main shaft (21) with the first linkage shaft (27) and the second linkage shaft (28), and the first linkage shaft (27) and the second linkage shaft (28) are driven to synchronously rotate reversely when the rotating main shaft (21) rotates.

3. A safety guard for construction engineering according to claim 2, wherein: and a rubber outer sleeve ring (231) is rotatably arranged on the outer side of the deflection handle (23).

4. A safety guard for construction engineering according to claim 3, wherein: the limiting part (24) comprises two oppositely arranged folded plates (241), the two folded plates (241) are hinged to the main net (1) so as to clamp the extension shaft (22) between the two folded plates (241), through holes (242) penetrating through the end parts of the two folded plates (241) are arranged, and locks (243) are arranged in the through holes (242) in the two folded plates (241).

5. A safety guard for building engineering according to claim 4, wherein: the linkage part (4) comprises a first bevel gear (41) arranged on a rotating main shaft (21), bearing seats five (42) are arranged at positions above and below the rotating main shaft (21) on the main network (1), transmission shafts (43) are arranged on the bearing seats five (42), second bevel gears (44) are arranged at one ends, close to the rotating main shaft (21), of the transmission shafts (43), the two second bevel gears (44) are meshed with the first bevel gear (41) and are respectively arranged right above and right below the first bevel gear (41);

the linkage mechanism is characterized by further comprising third bevel gears (45) respectively arranged at the other ends of the two transmission shafts (43), fourth bevel gears (46) and fifth bevel gears (47) are respectively arranged on the first linkage shaft (27) and the second linkage shaft (28), the fourth bevel gears (46) and the fifth bevel gears (47) are meshed with the third bevel gears (45), and the fourth bevel gears (46) and the fifth bevel gears (47) are respectively located on two sides of the third bevel gears (45) so that the first linkage shaft (27) and the second linkage shaft (28) can synchronously and reversely rotate.

6. A safety guard for building engineering according to claim 5, wherein: the transverse positioning component (3) comprises a bearing seat six (31) arranged at the end part of the longitudinal positioning bottom plate (16), a linkage shaft three (32) is arranged on the bearing seat six (31), and a longitudinal plate one (33) is arranged on the linkage shaft three (32);

a bearing seat seventh (34) is further arranged at one end, away from the bearing seat sixth (31), of the longitudinal positioning bottom plate (16), a linkage shaft fourth (35) is arranged on the bearing seat seventh (34), a longitudinal plate second (36) is arranged on the linkage shaft fourth (35), the linkage shaft third (32) is parallel to the linkage shaft fourth (35), and when the linkage shaft third (32) and the linkage shaft fourth (35) are deflected, the longitudinal plate first (33) and the longitudinal plate second (36) are driven to deflect and abut against the side wall of the elevator shaft

The device is characterized by further comprising a first transmission part (5) arranged between the third linkage shaft (32) and the bottom shaft (14), wherein the third linkage shaft (32) is driven to rotate when the bottom shaft (14) drives the longitudinal positioning bottom plate (16) to rotate, a second transmission part (6) is further arranged between the first transmission part (5) and the fourth linkage shaft (35), and when the first transmission part (5) is utilized to drive the third linkage shaft (32) to rotate, the fourth linkage shaft (35) is driven to rotate reversely.

7. A safety guard for building engineering according to claim 6, wherein: the first transmission part (5) comprises a third gear (51) arranged on a second linkage shaft (28), a rotating shaft (52) is arranged in the through groove (211), a fourth gear (53) meshed with the third gear (51) is arranged on the rotating shaft (52), a fifth gear (54) meshed with the fourth gear (53) is arranged on the bottom shaft (14), the fifth gear (54) is rotatably arranged on the bottom shaft (14) and is longer than the fourth gear (53), a first chain wheel (55) is arranged at the side edge of the fifth gear (54), and the first chain wheel (55) is also rotatably connected with the bottom shaft (14);

the linkage mechanism is characterized by further comprising a second chain wheel (56) arranged at the end part of the third linkage shaft (32), wherein a first chain (57) is arranged on the outer side of the second chain wheel (56) and the outer side of the first chain wheel (55) to drive the first chain wheel (55) and the second chain wheel (56) to be connected, and further the third linkage shaft (32) is driven to rotate when the second linkage shaft (28) rotates.

8. A safety guard for construction engineering according to claim 7, wherein: the second transmission part (6) comprises a third chain wheel (61) arranged at the end part of the fourth linkage shaft (35), the third chain wheel (61) is rotationally connected with the fourth linkage shaft (35), the first chain (57) rounds the outer side of the third chain wheel (61) and is meshed with the third chain wheel, a sixth gear (62) is arranged at the side edge of the third chain wheel (61), and the sixth gear (62) is also rotationally connected with the fourth linkage shaft (35);

the novel vertical positioning device is characterized by further comprising a bearing seat eight (63) arranged on the longitudinal positioning bottom plate (16), a linkage shaft five (64) is arranged on the bearing seat eight (63), a gear seven (65) meshed with the gear six (62) is arranged at one end of the linkage shaft five (64), a gear eight (66) is arranged at the other end of the linkage shaft five (64), a gear nine (67) is arranged on the linkage shaft four (35), a chain two (68) is arranged on the outer sides of the gear nine (67) and the gear eight (66), and then the linkage shaft four (35) and the linkage shaft three (32) are driven to synchronously and reversely rotate when the chain one (57) rotates.