CN213400282U

CN213400282U - Warning device for construction

Info

Publication number: CN213400282U
Application number: CN202022769842.7U
Authority: CN
Inventors: 周莉; 汪旭; 汝娟; 夏萍萍; 张卫卫
Original assignee: Anhui Tianrun Construction Engineering Group Co ltd
Current assignee: Anhui Tianrun Construction Engineering Group Co ltd
Priority date: 2020-11-24
Filing date: 2020-11-24
Publication date: 2021-06-08
Anticipated expiration: 2030-11-24

Abstract

The utility model relates to a warning device for construction belongs to warning device's technical field, and it includes the support frame, sets up at the warning sign of support frame top, sets up in the support frame top and be used for installing the installation component of warning sign and be used for adjusting the adjusting part of installation component height, adjusting part includes first slide bar and second slide bar, first slide bar with the equal vertical setting of second slide bar just first slide bar with the second slide bar all with support frame sliding connection, the installation component with first slide bar with second sliding bar connection, first slide bar with the second slide bar slides through the drive of first drive assembly. This application can be according to the requirement of construction, the height of adjustment warning sign. Through the first slide bar of first drive assembly drive and the second slide bar slides, can realize the regulation of warning sign height, can improve the warning effect of warning sign, reduce building site's potential safety hazard.

Description

Warning device for construction

Technical Field

The application relates to the technical field of warning devices, in particular to a warning device for building construction.

Background

Safety is a serious and perpetual topic, each constructor on a construction site needs one more responsibility and one more alert, and a warning device cannot be used for the safety construction normalization of the construction site. The warning device can make the information of the surrounding environment clear, strengthen safety management and enable potential safety hazards at the side to be clear at a glance, thereby improving the safety and vigilance awareness of constructors and promoting the safe construction to be carried out stably.

The correlation technique is chinese utility model patent of grant bulletin number CN211006426U discloses a warning device for building construction building protection, and the device includes the base, the top of base is provided with the support column, the top of support column is provided with the warning case, the right side bolt of warning case has connect warning mechanism, warning mechanism includes the framework, the inner chamber integrated into one piece of framework has the spud pile, and the surface bolt of spud pile has connect the clockwork spring, the other end bolt of clockwork spring has connect the change, the surface winding of change has the warning area.

To the correlation technique among the above-mentioned, the inventor thinks the highly fixed of support column, can't make the regulation according to building construction site actual need's warning height, leads to warning poor operation, has the potential safety hazard.

SUMMERY OF THE UTILITY MODEL

In order to adjust warning device according to required warning altitude mixture control, this application provides a warning device for construction.

The application provides a warning device for construction adopts following technical scheme:

the utility model provides a warning device for construction, includes the support frame, sets up warning sign, the setting in the support frame top just is used for installing the installation component of warning sign and is used for adjusting the adjusting part of installation component height in the support frame top, adjusting part includes first slide bar and second slide bar, first slide bar with the equal vertical setting of second slide bar just first slide bar with the second slide bar all with support frame sliding connection, the installation component with first slide bar with second sliding bar connection, first slide bar with the second slide bar slides through the drive of first drive assembly.

By adopting the technical scheme, the warning board meeting the requirements is installed on the installation component according to the warning requirements required by the construction site of the building construction, and then the height of the warning board is adjusted according to the installation requirements. Through the first slide bar of first drive assembly drive and the second slide bar slides, can realize the regulation of warning sign height, so set up, can improve the warning effect of warning sign, reduce building site's potential safety hazard.

Preferably, the support frame comprises a first upright column and a second upright column, the first upright column and the second upright column are both vertically arranged, the first slide bar is connected with the first upright column in a sliding manner, and the second slide bar is connected with the second upright column in a sliding manner; the cross sections of the first upright post and the second upright post are both rectangular, and the cross sections of the first sliding rod and the second sliding rod are both rectangular.

Through adopting above-mentioned technical scheme, slip first slide bar and second slide bar, can adjust warning device's height.

Preferably, the first driving assembly comprises a first screw rod rotatably connected with a first upright post and a second screw rod rotatably connected with a second upright post, the axial direction of the first screw rod is consistent with the axial direction of the first upright post, and the first screw rod penetrates through the first slide bar and is in threaded connection with the first slide bar; the axis direction of the second lead screw is consistent with the axis direction of the second upright post, the second lead screw penetrates through the second sliding rod and is in threaded connection with the second sliding rod, and a second driving assembly for driving the first lead screw and the second lead screw to synchronously rotate in the same direction is arranged on the supporting frame.

By adopting the technical scheme, the second driving assembly drives the first screw rod and the second screw rod to synchronously rotate in the same direction, the first screw rod is in threaded connection with the first slide rod, and the first slide rod cannot rotate and can only slide along the length direction of the first screw rod; second lead screw and second slide bar threaded connection, the second slide bar can't rotate, only can slide along the length direction of second lead screw to realize the removal of installation component in vertical direction, finally change the height of warning sign in vertical direction.

Preferably, the second driving assembly comprises a transverse plate, a rotating shaft which penetrates through the transverse plate and is connected with the transverse plate in a rotating mode, a first bevel gear which is fixedly sleeved on the rotating shaft, a transmission shaft which is connected with the first stand column and the second stand column in a rotating mode, a second bevel gear which is fixedly sleeved on the transmission shaft and is meshed with the first bevel gear, a third bevel gear which is fixedly sleeved at one end, close to the first lead screw, of the transmission shaft, a fourth bevel gear which is fixedly sleeved on the first lead screw and is meshed with the third bevel gear, a fifth bevel gear which is fixedly sleeved at one end, close to the second lead screw, of the transmission shaft, and a sixth bevel gear which is fixedly sleeved on the second lead screw and is meshed with the fifth bevel gear, one end of the transverse plate is fixed to the side wall of the first stand column, the other end of the transverse plate is fixed to the.

By adopting the technical scheme, the rotating shaft is rotated to drive the first bevel gear to rotate, the first bevel gear drives the second bevel gear to rotate, so that the transmission shaft is driven to rotate, the transmission shaft rotates to drive the third bevel gear and the fifth bevel gear to synchronously rotate in the same direction, the third bevel gear is meshed with the fourth bevel gear on the first screw rod, and the fifth bevel gear is meshed with the sixth bevel gear on the second screw rod, so that the first screw rod and the second screw rod are driven to synchronously rotate in the same direction.

Preferably, a first limiting groove is formed in the first upright column, and a first limiting block in sliding fit with the first limiting groove is fixed at the lower end of the first sliding rod; and a second limiting groove is formed in the second stand column, and a second limiting block in sliding fit with the second limiting groove is fixed at the lower end of the second sliding rod.

By adopting the technical scheme, the first limiting block is arranged, so that the first sliding rod is prevented from being separated from the first upright post; and a second limiting block is arranged to prevent the second slide bar from separating from the second upright post.

Preferably, the installation component includes fix first installation pole in first slide bar upper end, fix second installation pole in second slide bar upper end and with first installation pole and the fixed mounting panel of second installation pole, first installation pole with the equal vertical setting of second installation pole, the warning sign with mounting panel releasable connection.

Through adopting above-mentioned technical scheme, warning sign and mounting panel releasable connection can change different warning signs according to the demand of construction scene.

Preferably, the support frame below is provided with supporting component, supporting component is including fixing the first bracing piece at first stand lower extreme, fixing at the second bracing piece of second stand lower extreme, installing at the first universal wheel at first bracing piece both ends and installing at the second universal wheel at second bracing piece both ends, first bracing piece with second bracing piece parallel arrangement just first bracing piece with the equal level setting of second bracing piece, the length direction of first bracing piece with the length direction of first stand is perpendicular just the length direction of first bracing piece with the length direction of diaphragm is perpendicular.

Through adopting above-mentioned technical scheme, set up first universal wheel and the removal of this application warning device of being convenient for of second universal wheel.

Preferably, the side walls of the two ends of the first support rod are respectively provided with a first support seat, the first support seat is provided with a first waist hole, a first bolt penetrates through the first waist hole, the first bolt is in threaded connection with the side wall of the first support rod, and the first waist hole is formed along the vertical direction; the side walls of two ends of the second supporting rod are respectively provided with a second supporting seat, a second waist hole is formed in the second supporting seat, a second bolt penetrates through the second waist hole, the second bolt is in threaded connection with the side wall of the second supporting rod, and the second waist hole is formed in the vertical direction.

By adopting the technical scheme, when the warning device needs to be moved, the first bolt is screwed out, the first supporting seat is moved upwards until the bottom surface of the first supporting seat is separated from the ground, and then the first bolt is screwed; the second bolt is screwed out, the second supporting seat is moved upwards until the bottom surface of the second supporting seat is separated from the bottom surface, and then the second bolt is screwed, so that the warning device can be conveniently pushed.

In summary, the present application includes at least one of the following beneficial technical effects:

1. according to the warning requirement required by a construction site, the warning board meeting the requirement is installed on the installation assembly, and then the height of the warning board is adjusted according to the installation requirement, so that the warning effect of the warning board can be improved, and the potential safety hazard of the construction site is reduced;

2. the second driving assembly drives the first screw rod and the second screw rod to synchronously rotate in the same direction, the first screw rod is in threaded connection with the first slide rod, and the first slide rod cannot rotate and can only slide along the length direction of the first screw rod; the second screw rod is in threaded connection with the second slide rod, the second slide rod cannot rotate and can only slide along the length direction of the second screw rod, so that the mounting assembly can move in the vertical direction, and the height of the warning board in the vertical direction is changed finally;

3. warning sign and mounting panel releasable connection can change different warning signs according to the demand of construction scene.

Drawings

Fig. 1 is a schematic overall structure diagram of an embodiment of the present application.

Fig. 2 is a cross-sectional view of an embodiment of the present application.

Fig. 3 is a schematic view of the internal structure of the first column according to the embodiment of the present application.

Fig. 4 is a schematic view of the internal structure of the second pillar according to the embodiment of the present application.

Description of reference numerals: 1. a support frame; 11. a first upright post; 111. a first chute; 112. a first limit groove; 12. a second upright post; 121. a second chute; 122. a second limit groove; 2. a warning board; 21. locking the bolt; 3. mounting the component; 31. a first mounting bar; 32. a second mounting bar; 33. mounting a plate; 4. an adjustment assembly; 41. a first slide bar; 411. a first stopper; 42. a second slide bar; 421. a second limiting block; 5. a first drive assembly; 51. a first lead screw; 52. a second lead screw; 6. a second drive assembly; 61. a transverse plate; 62. a rotating shaft; 621. a hand wheel; 63. a first bevel gear; 64. a drive shaft; 65. a second bevel gear; 66. a third bevel gear; 67. a fourth bevel gear; 68. a fifth bevel gear; 69. a sixth bevel gear; 7. a support assembly; 71. a first support bar; 72. a second support bar; 73. a first universal wheel; 74. a second universal wheel; 75. a first support base; 751. a first waist hole; 752. a first bolt; 76. a second support seat; 761. a second waist hole; 762. and a second bolt.

Detailed Description

The present application is described in further detail below with reference to figures 1-4.

The embodiment of the application discloses warning device for construction. Referring to fig. 1 and 2, the warning device for building construction comprises a support frame 1, a warning board 2, a mounting assembly 3, an adjusting assembly 4 and a first driving assembly 5.

As shown in fig. 1-2, the supporting frame 1 includes a first upright post 11 and a second upright post 12, the first upright post 11 and the second upright post 12 are both disposed, the cross sections of the first upright post 11 and the second upright post 12 are both rectangular, a first sliding groove 111 is disposed on the first upright post 11 from top to bottom along the upper end surface thereof, and a second sliding groove 121 is disposed on the second upright post 12 from top to bottom along the upper end surface thereof.

As shown in fig. 2 to fig. 3, the adjusting assembly 4 includes a first sliding rod 41 and a second sliding rod 42, the cross section of the first sliding rod 41 is rectangular, the length direction of the first sliding rod 41 is consistent with the length direction of the first upright 11, and the first sliding rod 41 is in sliding fit with the first sliding groove 111. First limiting grooves 112 are symmetrically formed in the side wall of the first sliding groove 111, the first limiting grooves 112 do not penetrate through the side wall of the first sliding groove 111, a first limiting block 411 in sliding fit with the first limiting grooves 112 is fixed on the side wall of the lower end of the first sliding rod 41, and the first limiting block 411 is arranged to prevent the first sliding rod 41 from being separated from the first upright post 11. Referring to fig. 4, the cross section of the second slide bar 42 is rectangular, the length direction of the second slide bar 42 is consistent with the length direction of the second upright 12, and the second slide bar 42 is in sliding fit with the second sliding groove 121. A second limiting groove 122 is formed in a side wall of the second sliding groove 121, the second limiting groove 122 does not penetrate through the second sliding groove 121, a second limiting block 421 slidably engaged with the second limiting groove 122 is fixed on a side wall of a lower end of the second sliding rod 42, and the second limiting block 421 is arranged to prevent the second sliding rod 42 from being separated from the second upright post 12.

As shown in fig. 1, the mounting assembly 3 includes a first mounting rod 31, a second mounting rod 32 and a mounting plate 33, the first mounting rod 31 has a rectangular cross section, the length direction of the first mounting rod 31 is identical to the length direction of the first upright 11, and the lower end of the first mounting rod 31 is fixed to the upper end surface of the first slide bar 41. The cross section of the second mounting rod 32 is rectangular, the length direction of the second mounting rod 32 is consistent with the length direction of the second upright post 12, and the lower end of the second mounting rod 32 is fixed on the upper end surface of the second sliding rod 42. The vertical setting of mounting panel 33 and the length direction of mounting panel 33 is perpendicular with the length direction of first stand 11, and the one end of mounting panel 33 is fixed with the upper end lateral wall of first installation pole 31, and the other end of installation pole is fixed with the upper end lateral wall of second installation pole 32. Warning sign 2 and mounting panel 33 parallel arrangement and warning sign 2 pass through locking bolt 21 to be fixed on mounting panel 33, when needing to change warning sign 2, back out locking bolt 21 can.

As shown in fig. 2, the first driving assembly 5 includes a first lead screw 51 and a second lead screw 52, the first lead screw 51 is located in the first sliding slot 111, a length direction of the first lead screw 51 is consistent with an opening direction of the first sliding slot 111, a lower end of the first lead screw 51 is rotatably connected with a slot bottom of the first sliding slot 111, and the first lead screw 51 passes through the first sliding rod 41 and is in threaded connection with the first sliding rod 41. The second screw 52 is located in the second sliding groove 121, the length direction of the second screw 52 is consistent with the opening direction of the second sliding groove 121, the lower end of the second screw 52 is rotatably connected with the bottom of the second sliding groove 121, and the second screw 52 passes through the second sliding rod 42 and is in threaded fit with the second sliding rod 42.

As shown in fig. 2, the first screw 51 and the second screw 52 are synchronously rotated in the same direction by the second driving assembly 6, and the second driving assembly 6 comprises a transverse plate 61, a rotating shaft 62, a first bevel gear 63, a transmission shaft 64, a second bevel gear 65, a third bevel gear 66, a fourth bevel gear 67, a fifth bevel gear 68 and a sixth bevel gear 69. The transverse plate 61 is located below the mounting plate 33, the transverse plate 61 is parallel to the mounting plate 33, one end of the transverse plate 61 is fixed to the side wall of the lower end of the first upright post 11, and the other end of the transverse plate 61 is fixed to the side wall of the lower end of the second upright post 12. The rotating shaft 62 is perpendicular to the transverse plate 61, the rotating shaft 62 penetrates through the transverse plate 61 and is rotatably connected with the transverse plate 61, and the first bevel gear 63 is fixedly sleeved on the rotating shaft 62. The transmission shaft 64 is horizontally arranged, one end of the transmission shaft 64 penetrates through the side wall of the first upright post 11 and is rotatably connected with the first upright post 11, the other end of the transmission shaft 64 penetrates through the side wall of the second upright post 12 and is rotatably connected with the second upright post 12, the second bevel gear 65 is fixedly sleeved in the middle of the transmission shaft 64, and the second bevel gear 65 is meshed with the first bevel gear 63. The third bevel gear 66 is fixedly sleeved at one end of the transmission shaft 64 close to the first upright post 11, the fourth bevel gear 67 is fixedly sleeved on the first screw rod 51, and the third bevel gear 66 is meshed with the fourth bevel gear 67. A fifth bevel gear 68 is fixedly sleeved at one end of the transmission shaft 64 close to the second upright post 12, a sixth bevel gear 69 is fixedly sleeved on the second screw rod 52, and the sixth bevel gear 69 is meshed with the fifth bevel gear 68. A hand wheel 621 for driving the rotating shaft 62 to rotate is fixed at one end of the rotating shaft 62 far away from the first bevel gear 63, the hand wheel 621 drives the rotating shaft 62 to rotate, the rotating shaft 62 drives the first bevel gear 63 to rotate, the first bevel gear 63 drives the second bevel gear 65 to rotate, so as to drive the transmission shaft 64 to rotate, the transmission shaft 64 rotates to drive the third bevel gear 66 and the fifth bevel gear 68 to synchronously rotate in the same direction, because the third bevel gear 66 is meshed with the fourth bevel gear 67 on the first screw rod 51, the fifth bevel gear 68 is meshed with the sixth bevel gear 69 on the second screw rod 52, so as to drive the first screw rod 51 and the second screw rod 52 to synchronously rotate in the same direction.

As shown in fig. 1, a support assembly 7 is disposed below the support frame 1, and the support assembly 7 includes a first support rod 71, a second support rod 72, a first universal wheel 73, and a second universal wheel 74. The first support rod 71 is fixed at the lower end of the first upright post 11, the length direction of the first support rod 71 is perpendicular to the length direction of the transverse plate 61, two first universal wheels 73 are arranged, and the two universal wheels are respectively installed at two ends of the first support rod 71. The second support rod 72 is fixed at the lower end of the second upright post 12, the length direction of the second support rod 72 is perpendicular to the length direction of the transverse plate 61, two second universal wheels 74 are provided, and the two second universal wheels 74 are respectively installed at two ends of the second support rod 72. The provision of the first and second

universal wheels

73, 74 facilitates the movement of the warning device of the present application.

As shown in fig. 1, the side walls at the two ends of the first support rod 71 are fixed with first support seats 75, the first support seats 75 are vertically provided with first waist holes 751, first bolts 752 penetrate through the first waist holes 751, and the first bolts 752 are in threaded connection with the first support rod 71. The side walls at the two ends of the second support rod 72 are fixed with second support seats 76, second waist holes 761 are vertically formed in the second support seats 76, second bolts 762 pass through the second waist holes 761, and the second bolts 762 are in threaded connection with the second support rod 72. When the warning device needs to be moved, the first bolt 752 is screwed out, the first supporting seat 75 is moved upwards until the bottom surface of the first supporting seat 75 is separated from the ground, and then the first bolt 752 is screwed; the second bolt 762 is unscrewed, the second support seat 76 is moved upwards until the bottom surface of the second support seat 76 is separated from the bottom surface, and then the second bolt 762 is screwed, so that the warning device can be conveniently pushed.

The implementation principle of the warning device for building construction in the embodiment of the application is as follows: according to the required warning requirement of construction worker degree job site, will accord with warning sign 2 of requirement and install on installation component 3, then according to the installation requirement, adjust the height of warning sign 2. The hand wheel 621 is rotated to drive the transmission shaft 64 to rotate, so as to drive the first lead screw 51 and the second lead screw 52 to synchronously rotate in the same direction, the first lead screw 51 rotates to drive the first slide rod 41 to slide in the axial direction of the first lead screw 51, the second lead screw 52 rotates to drive the second slide rod 42 to slide in the axial direction of the second lead screw 52. The sliding of the first slide bar 41 and the second slide bar 42 drives the first mounting bar 31 and the second mounting bar 32 to move in the vertical direction, so as to change the height of the warning board 2 in the vertical direction.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a warning device for construction which characterized in that: including support frame (1), warning sign (2), the setting that sets up in support frame (1) top, set up in support frame (1) top and be used for installing installation component (3) of warning sign (2) and be used for adjusting adjustment assembly (4) of installation component (3) height, adjustment assembly (4) include first slide bar (41) and second slide bar (42), first slide bar (41) with the equal vertical setting of second slide bar (42) just first slide bar (41) with second slide bar (42) all with support frame (1) sliding connection, installation component (3) with first slide bar (41) with second slide bar (42) are connected, first slide bar (41) with second slide bar (42) drive slip through first drive assembly (5).

2. The warning device for building construction according to claim 1, wherein: the supporting frame (1) comprises a first upright post (11) and a second upright post (12), the first upright post (11) and the second upright post (12) are both vertically arranged, the first sliding rod (41) is connected with the first upright post (11) in a sliding manner, and the second sliding rod (42) is connected with the second upright post (12) in a sliding manner; the cross sections of the first upright post (11) and the second upright post (12) are both rectangular, and the cross sections of the first sliding rod (41) and the second sliding rod (42) are both rectangular.

3. The warning device for building construction as claimed in claim 2, wherein: the first driving assembly (5) comprises a first screw rod (51) rotatably connected with a first upright post (11) and a second screw rod (52) rotatably connected with a second upright post (12), the axial direction of the first screw rod (51) is consistent with the axial direction of the first upright post (11), and the first screw rod (51) penetrates through the first sliding rod (41) and is in threaded connection with the first sliding rod (41); the axial direction of the second screw rod (52) is consistent with the axial direction of the second upright post (12), the second screw rod (52) penetrates through the second sliding rod (42) and is in threaded connection with the second sliding rod (42), and a second driving assembly (6) for driving the first screw rod (51) and the second screw rod (52) to synchronously rotate in the same direction is arranged on the support frame (1).

4. The warning device for building construction as claimed in claim 3, wherein: the second driving component (6) comprises a transverse plate (61), a rotating shaft (62) which penetrates through the transverse plate (61) and is rotationally connected with the transverse plate (61), a first bevel gear (63) which is fixedly sleeved on the rotating shaft (62), a transmission shaft (64) which is rotationally connected with the first upright post (11) and the second upright post (12), a second bevel gear (65) which is fixedly sleeved on the transmission shaft (64) and is meshed with the first bevel gear (63), a third bevel gear (66) which is fixedly sleeved on one end of the transmission shaft (64) close to the first screw rod (51), a fourth bevel gear (67) which is fixedly sleeved on the first screw rod (51) and is meshed with the third bevel gear (66), a fifth bevel gear (68) which is fixedly sleeved on one end of the transmission shaft (64) close to the second screw rod (52) and a sixth bevel gear (69) which is fixedly sleeved on the second screw rod (52) and is meshed with the fifth bevel gear (68), one end of the transverse plate (61) is fixed with the side wall of the first upright post (11), the other end of the transverse plate (61) is fixed with the side wall of the second upright post (12), and the length direction of the transmission shaft (64) is consistent with that of the transverse plate (61).

5. The warning device for building construction as claimed in claim 2, wherein: a first limiting groove (112) is formed in the first upright column (11), and a first limiting block (411) in sliding fit with the first limiting groove (112) is fixed at the lower end of the first sliding rod (41); a second limiting groove (122) is formed in the second upright post (12), and a second limiting block (421) in sliding fit with the second limiting groove (122) is fixed at the lower end of the second sliding rod (42).

6. The warning device for building construction according to claim 1, wherein: installation component (3) including fix first installation pole (31) in first slide bar (41) upper end, fix second installation pole (32) in second slide bar (42) upper end and with first installation pole (31) and second installation pole (32) fixed mounting panel (33), first installation pole (31) with the equal vertical setting of second installation pole (32), warning sign (2) with mounting panel (33) releasable connection.

7. The warning device for building construction as claimed in claim 4, wherein: support frame (1) below is provided with supporting component (7), supporting component (7) are including fixing first bracing piece (71) at first stand (11) lower extreme, fixing second bracing piece (72) at second stand (12) lower extreme, installing at first universal wheel (73) at first bracing piece (71) both ends and installing at second universal wheel (74) at second bracing piece (72) both ends, first bracing piece (71) with second bracing piece (72) parallel arrangement just first bracing piece (71) with the equal level of second bracing piece (72) sets up, the length direction of first bracing piece (71) with the length direction of first stand (11) is perpendicular just the length direction of first bracing piece (71) with the length direction of diaphragm (61) is perpendicular.

8. The warning device for building construction as claimed in claim 7, wherein: the side walls of two ends of the first supporting rod (71) are respectively provided with a first supporting seat (75), the first supporting seat (75) is provided with a first waist hole (751), a first bolt (752) penetrates through the first waist hole (751), the first bolt (752) is in threaded connection with the side wall of the first supporting rod (71), and the first waist hole (751) is formed in the vertical direction; all be provided with second supporting seat (76) on the both ends lateral wall of second bracing piece (72), second waist hole (761) has been seted up on second supporting seat (76), it has second bolt (762) to pass in second waist hole (761), second bolt (762) with the lateral wall threaded connection of second bracing piece (72), second waist hole (761) are seted up along vertical direction.