CN113500704A

CN113500704A - Roof dust protected dirt wall drilling equipment for interior decoration

Info

Publication number: CN113500704A
Application number: CN202110879674.3A
Authority: CN
Inventors: 吴伊曼
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-08-02
Filing date: 2021-08-02
Publication date: 2021-10-15

Abstract

The invention relates to the technical field of interior decoration equipment, in particular to a roof dustproof type mud wall drilling device based on interior decoration, which comprises a roof dustproof type mud wall drilling device and comprises: roof dust protected dirt wall drilling equipment includes: the lifting assembly comprises a bottom plate, a scissor mechanism is arranged above the bottom plate, a lifting plate is connected to the top of the scissor mechanism, a movable support is connected to the upper portion of the lifting plate through an adjusting assembly, and a drilling machine is connected to the outer portion of the movable support; the positioning assembly comprises an outer rod, an inner rod is connected inside the outer rod, and the other end of the inner rod is connected with a positioning shaft. The device can effectively determine the position of the subsequent drilling according to the position of the initial drilling, can effectively ensure the horizontal property of the axis between the drilling positions, avoids the deviation of the axis, has efficient dustproof effect, is convenient to clean collected dust, and greatly improves the working efficiency of the device.

Description

Roof dust protected dirt wall drilling equipment for interior decoration

Technical Field

The invention relates to the technical field of interior decoration equipment, in particular to a roof dustproof type mud wall drilling device based on interior decoration.

Background

The drilling is an operation of processing holes on solid materials by using a drill bit, and the drilling work in exploration work, auxiliary tools needed for drilling and partial emergency measures are taught, the interior decoration comprises room design, decoration, furniture arrangement and various small mounting points, the decoration construction in a building is emphasized, and in the early preparation process of the interior decoration, a roof drilling device which is mutually matched is needed to realize the drilling treatment, so that the work of the interior decoration is convenient to carry out.

However, when the existing roof drilling device for indoor decoration is used, the drilling treatment of the roof and the wall body at the edge of the roof is usually realized by the arrangement of a lifter and a drilling machine, but in the process of drilling, a ruler or a wire drawing mode is needed to realize the measurement processing of the distance between the two holes, thereby ensuring the accuracy of the drilling distance, thereby facilitating the improvement of subsequent decoration work, however, in the process of positioning the drilling position, the existing treatment of guy wire and the like, when in use, the measurement is inconvenient, the levelness control is complex, the hole axes of the two drill holes are not on the same horizontal line easily, the position of the drill hole is further deviated, thereby influencing the subsequent indoor decoration work, meanwhile, the prior device has poor dust removal effect and can not meet the requirement of the diversified work, therefore, it is necessary to design a roof dust-proof type mud wall drilling device for interior decoration to solve the above problems.

Disclosure of Invention

The invention aims to provide a roof dustproof type mud wall drilling device based on interior decoration, and aims to solve the problems that drilling positions of equipment are inconvenient to position and axes are easy to deviate in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a based on roof dust protected mud wall drilling equipment for interior decoration, includes:

the lifting assembly comprises a bottom plate, universal wheels are connected below the bottom plate, a first lead screw is connected above the bottom plate, a fixing plate is fixedly connected to the bottom of the first lead screw, a scissor fork mechanism is arranged above the bottom plate, a lifting plate is connected to the top of the scissor fork mechanism, a push rod is arranged above the bottom plate, a movable support is connected above the lifting plate through an adjusting assembly, and a drilling machine is connected to the outside of the movable support;

positioning assembly, positioning assembly sets up the one side at the movable support, positioning assembly includes the outer pole, the internal connection of outer pole has interior pole, the other end of interior pole is connected with the location axle, the location axle includes the third lead screw, the outside of third lead screw is provided with solid fixed ring, gu fixed ring fixed connection is in the outside of interior pole, the one end of third lead screw is connected with the loose collar, the external connection of loose collar has first hinge bar, gu fixed ring's external connection has the second hinge bar, first hinge bar all is connected with the backup pad with the other end of second hinge bar.

Preferably, four corners of the bottom plate are all provided with the nut pair, and the nut pair internal meshing is connected with first lead screw, the fixed plate is L shape structure, be connected with the direction telescopic link between fixed plate and the bottom plate, the outside of push rod is provided with the flexible glue protection pad.

Preferably, the adjusting part includes the protecting crust, protecting crust fixed connection is at the upper surface of lifter plate, the inside of protecting crust is provided with the second lead screw, the outside meshing of second lead screw has first nut vice, the vice external connection of first nut has the slide, the both sides of slide all are provided with the uide bushing, the guide bar has been run through to the inside of uide bushing.

Preferably, both ends of the second screw are provided with ball bearings, the ball bearings are arranged on the inner wall of the protective shell, one end of the second screw is connected with a rotating handle, the upper portion of the sliding plate is connected with a movable support, and the guide sleeve is in sliding connection with the guide rod.

Preferably, the movable support comprises a stand column and a rotary guide operation frame, one side of the rotary guide operation frame is connected with a drilling machine in a sliding mode, and the other side of the rotary guide operation frame is connected with an outer rod.

Preferably, a dustproof assembly is arranged above the lifting plate and comprises a dust collector, a dust collection barrel is arranged above the dust collector, a dust collection cover is arranged inside the dust collection barrel, a first guide pipe and a second guide pipe are connected above the dust collection barrel, the other end of the first guide pipe is connected with a first dust collection hole of the dust cover, and the other end of the second guide pipe is connected with a second dust collection hole of the dust cover.

Preferably, the dust hood is of a concave conical structure, the center line of the dust hood is lower than the dust suction barrel, the dust hood is arranged outside the drilling machine and is in sliding connection with the drilling machine, a soft rubber sealing ring is arranged at one end of the dust hood, the second dust collecting hole is formed in the outer side of the dust hood, the first dust collecting hole is formed in the end portion of the guide rod, and the first dust collecting hole is formed in one end of the drilling machine in a sleeved mode.

Preferably, one side of outer pole is provided with the locating hole, the top of interior pole is provided with the regulation hole, and the outside edge of interior pole is provided with the scale mark, and the one end of interior pole is the ring form, and the circular form inside runs through has the third lead screw, retaining ring fixed connection is in the circular-arc outside of interior pole.

Preferably, the ring form of third lead screw and interior pole is passed through ball bearing and is connected, the one end of third lead screw is the lead screw form, and the outside meshing of third lead screw form is connected with the loose ring, first hinge bar is to rotate with the second hinge bar and be connected, and run through between first hinge bar and the second hinge bar has the axis of rotation, the outer wall of backup pad is provided with the protection and fills up.

Compared with the prior art, the invention has the beneficial effects that: the device can be effectual position according to initial drilling realize confirming the position of follow-up drilling, can effectually guarantee the axle center horizontality between the drilling position, avoid appearing the axle center skew, lead to the drilling position deviation to appear, have the dustproof effect of efficient simultaneously, conveniently clear up the dust of collecting, improved the work efficiency of device greatly.

1. This roof dust protected mud wall drilling equipment for interior decoration passes through locating component's setting, can make the device at the in-process that carries out drilling treatment, through locating component's setting, can realize carrying out accurate location to the position of drilling, and can be according to the diameter size of drilling, effectual realization is confirmed the axle center of follow-up drilling position to the effectual horizontality of guaranteeing the goblet empty position avoids drilling position skew to appear, thereby influences follow-up construction process, reduces work efficiency.

2. This roof dust protected dirt wall drilling equipment for interior decoration passes through the setting of dustproof subassembly, dustproof processing when can effectual realization drilling, and through the setting of two different dust collecting holes, can adapt to the drilling processing under horizontal state and the vertical state, effectual in service behavior according to the device drilling realizes dustproof processing, and the setting through the dust collecting net cover, can realize handling the collection of dust, the clearance of convenient follow-up dust is used, dustproof efficiency when having improved drilling and the clearance efficiency of follow-up dust greatly.

Drawings

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

FIG. 2 is a schematic view of the overall structure of the lift assembly of the present invention;

FIG. 3 is a schematic view of the internal overall structure of the adjustment assembly of the present invention;

FIG. 4 is a schematic view of the overall distribution of the drill rig of the present invention;

FIG. 5 is a schematic view of the overall structure of the drill rig of the present invention;

FIG. 6 is a schematic view of the overall structure of the dustproof assembly of the present invention;

FIG. 7 is a schematic view of the overall structure of the dust boot of the present invention;

fig. 8 is a schematic view of the overall structure of the positioning shaft of the present invention.

In the figure: 1. a lifting assembly; 11. a base plate; 12. a universal wheel; 13. a first lead screw; 14. a fixing plate; 15. a scissor mechanism; 16. a lifting plate; 17. a push rod; 2. an adjustment assembly; 21. a protective shell; 22. a second lead screw; 23. a first nut pair; 24. a slide plate; 25. a guide sleeve; 26. a guide bar; 3. a movable support; 4. a dust-proof assembly; 41. a dust collector; 42. a dust suction barrel; 43. a dust collection cover; 44. a first conduit; 45. a second conduit; 46. a dust cover; 47. a first dust collecting hole; 48. a second dust collecting hole; 5. a drilling machine; 6. a positioning assembly; 61. an outer rod; 62. an inner rod; 63. positioning the shaft; 631. a third lead screw; 632. a fixing ring; 633. a movable ring; 634. a first hinge lever; 635. a second hinge lever; 636. and a support plate.

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, an embodiment of the present invention:

the utility model provides a based on roof dust protected mud wall drilling equipment for interior decoration, includes:

the lifting assembly 1 comprises a bottom plate 11, a universal wheel 12 is connected below the bottom plate 11, a first lead screw 13 is connected above the bottom plate 11, a fixing plate 14 is fixedly connected to the bottom of the first lead screw 13, a scissor mechanism 15 is arranged above the bottom plate 11, a lifting plate 16 is connected to the top of the scissor mechanism 15, a push rod 17 is arranged above the bottom plate 11, the upper portion of the lifting plate 16 is connected with a rear movable support 3 through an adjusting assembly 2, a drilling machine 5 is connected to the outer portion of the movable support 3, the position of the drilling machine 5 can be mainly adjusted through the arrangement of the lifting assembly 1, the upper height and the lower height of the drilling machine can be adjusted, and the roof can be conveniently drilled;

positioning assembly 6, positioning assembly 6 is arranged on one side of movable support 3, positioning assembly 6 includes outer rod 61, inner rod 62 is connected inside outer rod 61, positioning shaft 63 is connected to the other end of inner rod 62, positioning shaft 63 includes third lead screw 631, fixing ring 632 is arranged outside third lead screw 631, fixing ring 632 is fixedly connected outside inner rod 62, one end of third lead screw 631 is connected with movable ring 633, first hinge rod 634 is connected outside movable ring 633, second hinge rod 635 is connected outside fixing ring 632, support plate 636 is connected to the other ends of first hinge rod 634 and second hinge rod 635, through the arrangement of the structure, accurate determination of the position of drilling can be realized, vertical deviation of the position of drilling is avoided, thereby delaying of subsequent construction progress is caused, when in use, operation control can be performed according to convenience of use, after can demolising interior pole 62 and outer pole 61, realize the location back to drilling through location axle 63, with outer pole 61 with interior pole 62 peg graft can, and then realize its determination of drilling position, the regulation on a large scale is realized with the flexible control of outer pole 61 in the accessible, further realizes the fine setting of little distance through adjusting part 2 to the realization carries out accurate control to the drilling position, and has guaranteed the horizontality in drilling axle center.

Further, four corners of bottom plate 11 all are provided with the nut vice, and the vice inside engagement of nut is connected with first lead screw 13, fixed plate 14 is L shape structure, rotation through first lead screw 13, can try down fixed plate 14's oscilaltion, further when fixed plate 14 and ground contact, can realize the stability control to the device, avoid the skew to appear among the drilling process, be connected with the direction telescopic link between fixed plate 14 and the bottom plate 11, a direction flexible control for the lift of fixed plate 14, the outside of push rod 17 is provided with the flexible glue protection pad, make operator's hand more comfortable, conveniently promote.

Further, adjusting part 2 includes protecting crust 21, protecting crust 21 fixed connection is at the upper surface of lifter plate 16, the inside of protecting crust 21 is provided with second lead screw 22, second lead screw 22's external toothing has first nut pair 23, the external connection of first nut pair 23 has slide 24, slide 24's both sides all are provided with uide bushing 25, uide bar 26 has been run through to the inside of uide bushing 25, setting through this structure, can realize the further regulation to movable support 3 positions, through the setting of protecting crust 21 upper surface scale, from further realizing the accurate control to its removal, guarantee the accuracy of drilling pitch, through rotating second lead screw 22, can drive first nut pair 23 and remove, further the movable support 3 that drives the top through slide 24 removes.

Further, both ends of second lead screw 22 all are provided with ball bearing, and ball bearing sets up the inner wall at protecting crust 21, second lead screw 22 pivoted smoothness nature has been guaranteed, reduce second lead screw 22's friction, second lead screw 22's one end is connected with rotatory handle, conveniently rotate second lead screw 22, it is more convenient to make the operation, slide 24's top is connected with movable support 3, uide bushing 25 is sliding connection with guide bar 26, play the direction control to slide 24 removals.

Further, movable support 3 includes stand and rotatory direction handling frame, and one side sliding connection of rotatory direction handling frame has drilling machine 5, and the opposite side of rotatory direction handling frame is connected with outer pole 61, setting through movable support 3, further realize adjusting drilling machine 5's direction of operation etc., and movable support 3's stand can stretch out and draw back the regulation, contact with the roof, further realize fixing of device, and through rotatory direction handling frame, can realize drilling machine 5's vertical work or horizontal work through rotating, can further realize drilling machine 5's altitude mixture control simultaneously, drilling machine 5 comprises motor and drill bit, realize drilling work, movable support 3 all is prior art structure with drilling machine 5, consequently, do not explain it.

Furthermore, a dust-proof assembly 4 is arranged above the lifting plate 16, the dust-proof assembly 4 comprises a dust collector 41, a dust collecting barrel 42 is arranged above the dust collector 41, a dust collecting cover 43 is arranged inside the dust collecting barrel 42, a first guide pipe 44 and a second guide pipe 45 are connected above the dust collecting barrel 42, the other end of the first guide pipe 44 is connected with a first dust collecting hole 47 of the dust collecting cover 46, the other end of the second guide pipe 45 is connected with a second dust collecting hole 48 of the dust collecting cover 46, the dust collector 41 is matched with a small tablet press to remove and recover residual powder on the rotary table, the rotary table of the tablet press is kept clean and tidy, and other dust collecting functions can be performed, through the arrangement of the dust-proof assembly 4, dust-proof treatment during the operation of the drilling machine 5 can be realized, so that the dust drift of the operating environment is reduced, the efficiency of the operating environment is improved, through the operation of the dust collector 41, the dust in the dust collecting barrel 42 and the arrangement of the first guide pipe 44 and the second guide pipe 45 can be sucked, further through the inside of dust collection bucket 42 of dust collection after absorbing, and the setting through dust cage 43, further realize handling the collection of dust, and through the setting of toper structure, can avoid the dust to the cover of dust absorption hole, and can guarantee that dust cage 43 handles the collection of dust, convenient follow-up dust to collecting is cleared up, and dust cage 43 wholly adopts the net cotton material, has good stretchability and ventilative nature.

Further, dust cage 43 is indent toper structure, and the central line height of dust cage 43 is less than the height of dust absorption bucket 42, be convenient for collect the processing to the inside dust of dust absorption bucket 42, and the edge of dust cage 43 is fixed at the top edge of dust absorption bucket 42, dust cover 46 sets up the outside at drilling machine 5, and dust cover 46 is sliding connection with drilling machine 5, the one end of dust cover 46 is provided with the flexible glue sealing washer, play sealed effect, guarantee the in close contact with of dust cover 46 and wall body or roof, second dust collecting hole 48 is in the outside of dust cover 46, first dust collecting hole 47 is in the tip of guide bar 26, and first dust collecting hole 47 is in the one end of cup jointing in drilling machine 5 one side.

Further, one side of outer pole 61 is provided with the locating hole, and the top of interior pole 62 is provided with the regulation hole, and the outside edge of interior pole 62 is provided with the scale mark for the regulation of length detects, and the operation of being convenient for, and the one end of interior pole 62 is the ring form, and the circular form inside runs through there is third lead screw 631, and solid fixed ring 632 fixed connection is in the circular-arc outside of interior pole 62.

Further, the third screw 631 is connected to the inner rod 62 through a ball bearing in an annular shape, one end of the third screw 631 is in a screw shape, and the third lead screw 631 is engaged with the movable ring 633 in the form of a lead screw, the first hinge bar 634 is rotatably connected with the second hinge bar 635, and a rotation shaft is penetratingly connected between the first hinge rod 634 and the second hinge rod 635, a protection pad is disposed on an outer wall of the support plate 636, when the third lead screw 631 rotates, the movement of the movable ring 633 can be realized, when the fixed ring 632 is fixed with the inner rod 62, the first hinge bar 634 outside the movable ring 633 can perform scissor adjustment with the second hinge bar 635, and then realize the position control of backup pad 636 to the realization is to the location of drilling, and can realize confirming the axle center of drilling, interior pole 62 and outer pole 61 are in the axle center horizontal line of drilling when this moment can, thereby has guaranteed the accurate nature in position of follow-up drilling.

The working principle is as follows: when the device is used, the device is firstly moved to an operation area, the height and the drilling direction of the drilling machine 5 are further adjusted according to the drilled area, the vertical or horizontal drilling adjustment is realized by the rotation adjustment of the movable support 3, the height adjustment of the scissor mechanism 15 is further realized by the height of the roof, the device is fixed by the first lead screw 13 and the fixing plate 14, the dustproof treatment of the drilled hole can be realized by the arrangement of the dustproof assembly 4 during drilling, the dust collection can be realized by the close contact of the dustproof cover 46 and the wall body or the roof through the work of the dust collector 41, the dust can be sucked and collected by the second dust collecting hole 48 when the drilling machine 5 works horizontally, the dust collection can be realized by the first dust collecting hole 47 when the drilling machine 5 works vertically, collected dust is guided to the inside of dust absorption bucket 42 through first pipe 44 and second pipe 45 to through the setting of dust cage 43, realize the further collection to the dust, later stage only need change dust cage 43, can realize the clearance to the dust, convenient operation.

When the drilling position later after the second needs to be horizontally determined, can pass through setting of locating component 6, the axle center to follow-up drilling position is realized confirming according to preceding drilling position, at first place locating shaft 63 in the inside of drilling, further rotate third lead screw 631, can realize the removal of activity ring 633, further can realize the scissors regulation of first articulated rod 634 and second articulated rod 635, thereby realize the position control to backup pad 636, until the even conflict of three backup pad 636 is at the inner wall of drilling, further through the dismouting cooperation of outer pole 61 with interior pole 62, realize the regulation to drilling machine 5 drilling position, thereby the skew appears in effectual drilling position of avoiding, the identity horizontality of effectual assurance drilling position.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. The utility model provides a based on roof dust protected mud wall drilling equipment for interior decoration, its characterized in that includes:

the lifting assembly (1) comprises a bottom plate (11), universal wheels (12) are connected below the bottom plate (11), a first lead screw (13) is connected above the bottom plate (11), a fixing plate (14) is fixedly connected to the bottom of the first lead screw (13), a scissor fork mechanism (15) is arranged above the bottom plate (11), a lifting plate (16) is connected to the top of the scissor fork mechanism (15), a push rod (17) is arranged above the bottom plate (11), a rear movable support (3) is connected to the upper side of the lifting plate (16) through an adjusting assembly (2), and a drilling machine (5) is connected to the outer portion of the movable support (3);

locating component (6), locating component (6) set up the one side in movable support (3), locating component (6) are including outer pole (61), the internal connection of outer pole (61) has interior pole (62), the other end of interior pole (62) is connected with location axle (63), location axle (63) are including third lead screw (631), the outside of third lead screw (631) is provided with solid fixed ring (632), gu fixed ring (632) fixed connection is in the outside of interior pole (62), the one end of third lead screw (631) is connected with activity ring (633), the external connection of activity ring (633) has first articulated pole (634), the external connection of solid fixed ring (632) has second articulated pole (635), first articulated pole (634) all is connected with backup pad (636) with the other end of second articulated pole (635).

2. The roof dust-proof type mud wall drilling device based on interior decoration according to claim 1, characterized in that: four corners of bottom plate (11) all are provided with the nut vice, and the vice inside engagement of nut is connected with first lead screw (13), fixed plate (14) are L shape structure, be connected with the direction telescopic link between fixed plate (14) and bottom plate (11), the outside of push rod (17) is provided with the flexible glue protection pad.

3. The roof dust-proof type mud wall drilling device based on interior decoration according to claim 1, characterized in that: adjusting part (2) include protecting crust (21), protecting crust (21) fixed connection is at the upper surface of lifter plate (16), the inside of protecting crust (21) is provided with second lead screw (22), the external toothing of second lead screw (22) has vice (23) of first nut, the external connection of the vice (23) of first nut has slide (24), the both sides of slide (24) all are provided with uide bushing (25), guide bar (26) have been run through to the inside of uide bushing (25).

4. The roof dust-proof type mud wall drilling device based on interior decoration according to claim 3, characterized in that: the both ends of second lead screw (22) all are provided with ball bearing, and ball bearing sets up the inner wall at protecting crust (21), the one end of second lead screw (22) is connected with rotatory handle, the top of slide (24) is connected with movable support (3), uide bushing (25) are sliding connection with guide bar (26).

5. The roof dust-proof type mud wall drilling device based on interior decoration according to claim 1, characterized in that: the movable support (3) comprises an upright post and a rotary guiding operation frame, one side of the rotary guiding operation frame is connected with a drilling machine (5) in a sliding mode, and the other side of the rotary guiding operation frame is connected with an outer rod (61).

6. The roof dust-proof type mud wall drilling device based on interior decoration according to claim 1, characterized in that: the dust-proof assembly (4) is arranged above the lifting plate (16), the dust-proof assembly (4) comprises a dust collector (41), a dust collection barrel (42) is arranged above the dust collector (41), a dust collection cover (43) is arranged inside the dust collection barrel (42), a first guide pipe (44) and a second guide pipe (45) are connected above the dust collection barrel (42), the other end of the first guide pipe (44) is connected with a first dust collection hole (47) of a dust cover (46), and the other end of the second guide pipe (45) is connected with a second dust collection hole (48) of the dust cover (46).

7. The roof dust-proof type mud wall drilling device based on interior decoration according to claim 6, characterized in that: the dust collection cover (43) is of a concave conical structure, the height of the center line of the dust collection cover (43) is lower than that of the dust suction barrel (42), the dust cover (46) is arranged outside the drilling machine (5), the dust cover (46) is in sliding connection with the drilling machine (5), one end of the dust cover (46) is provided with a soft rubber sealing ring, the second dust collection hole (48) is located on the outer side of the dust cover (46), the first dust collection hole (47) is located at the end of the guide rod (26), and the first dust collection hole (47) is located at one end of the drilling machine (5) in a sleeved mode.

8. The roof dust-proof type mud wall drilling device based on interior decoration according to claim 1, characterized in that: one side of outer pole (61) is provided with the locating hole, the top of interior pole (62) is provided with the regulation hole, and the outside edge of interior pole (62) is provided with the scale mark, and the one end of interior pole (62) is the ring form, and the circular form inside runs through has third lead screw (631), gu fixed ring (632) fixed connection is in the circular-arc outside of interior pole (62).

9. The roof dust-proof type mud wall drilling device based on interior decoration according to claim 8, characterized in that: third lead screw (631) is connected through ball bearing with the ring form of interior pole (62), the one end of third lead screw (631) is the lead screw form, and the outside meshing of third lead screw (631) lead screw form is connected with activity ring (633), first articulated rod (634) is the rotation with second articulated rod (635) and is connected, and first articulated rod (634) and second articulated rod (635) both middle through connection have a axis of rotation, the outer wall of backup pad (636) is provided with the protection pad.