CN113003407A - Large-tonnage crane factory building steel structure - Google Patents

Abstract

The utility model belongs to the technical field of the technique of factory building crane and specifically relates to a large-tonnage crane factory building steel construction is related to, including multiunit stand and the rail that is used for the crane to remove of setting on the stand, be provided with the fastener in the one side that the stand is close to the rail, the stand is close to rail one side and is provided with the fastener, be provided with the connecting rod on the fastener, the one end bending type that the fastener was kept away from to the connecting rod becomes the kink that is used for fixing the fastener, kink and stand are connected, be provided with the intermediate frame between rail and the fastener, be provided with the spacing subassembly that is used for promoting between intermediate frame and the fastener on the fastener, the position that the stand is close to the intermediate frame is provided with the knot. The phenomenon effect that the reduction track that this application had appears squinting.

Description

Large-tonnage crane factory building steel structure

Technical Field

The application relates to the technical field of factory building cranes, in particular to a large-tonnage crane factory building steel structure.

Background

The factory building crane is a crane which is installed in a factory building and is transversely erected above workshops, warehouses and stock yards for hoisting objects, and is also called a bridge crane, the end part of the crane is located on a cement column or a metal support and is shaped like a bridge, the bridge frame longitudinally runs along a track laid on the elevated frames at two sides, the space below the bridge can be fully utilized for hoisting materials, and the application range is wide.

Regarding the factory building crane in order to promote the installation effectiveness among the correlation technique, so that adopt the steel construction to support, the steel construction adopts the I-steel, place the track of crane and install the side at the support steel construction, but to the factory building steel construction of large-tonnage, the jack-up weight of crane is great, and it is comparatively frequent to remove on the track, also lead to receiving vibrations between track and the steel construction in the time of frequent removal, easily lead to the track to take place the skew on the steel construction stand, thereby the phenomenon that the crane appeared gnawing the rail when removing, influence the normal operating of crane.

Disclosure of Invention

In order to reduce the phenomenon that the skew appears in the track, this application provides a large-tonnage crane factory building steel construction.

The application provides a large-tonnage crane factory building steel construction adopts following technical scheme:

the utility model provides a large-tonnage crane factory building steel construction, includes multiunit stand and the rail that is used for the crane to remove of setting on the stand, is provided with the fastener in one side that the stand is close to the rail, the stand is close to rail one side and is provided with the fastener, be provided with the connecting rod on the fastener, the one end bending type that the fastener was kept away from to the connecting rod forms the kink that is used for fixed fastener, kink and stand are connected, be provided with the intermediate frame between rail and the fastener, be provided with the spacing subassembly that is used for promoting joint strength between intermediate frame and the fastener on the fastener, the position that the stand is close to the intermediate frame is provided with the knot pole, detain pole and.

Through adopting above-mentioned technical scheme, when installing the fastener on the stand, connect through kink and stand on the connecting rod, fix in advance the fastener, so that fix the fastener, promote the joint strength between fastener and the stand simultaneously, set up the rail and pass through spacing subassembly with the fastener and connect, connect intermediate shelf and stand through the knot pole once more simultaneously, promote the stability of connecting between intermediate shelf and the fastener, reduce the phenomenon that the skew appears in the rail, promote the stability of crane operation.

Optionally, one side an organic whole that the fastener is close to middle frame is provided with supporting part, butt portion and spacing portion, supporting part and spacing portion all are on a parallel with ground and set up, supporting part and spacing portion set up at even interval in horizontal direction and vertical direction, the both sides of butt portion are connected with supporting part and spacing portion respectively, middle frame and supporting part are connected, be provided with the swash plate on the middle frame, swash plate and butt portion butt.

Through adopting above-mentioned technical scheme, supporting part and spacing portion all set up at interval on vertical and horizontal direction for butt portion is the tilt state, sets up swash plate and butt portion butt simultaneously, so that put into preset position with the intermediate frame under the effect on swash plate inclined plane, promote the installation effectiveness.

Optionally, a fixed block is fixedly arranged on the middle frame, the limiting assembly comprises a limiting block and a limiting screw rod, the limiting block is connected with the abutting portion, a slot is formed in the limiting block, the fixed block is inserted in the slot, and the limiting screw rod is arranged in the fixed block and the limiting block in a penetrating mode to fix the fixed block and the limiting block.

Through adopting above-mentioned technical scheme, after middle frame is placed on the fastener, through fixed block and slot lock, then fix fixed block and stopper through limiting screw, and then promote the connection stability between middle frame and the spacing portion.

Optionally, the buckling rod is integrally provided with a horizontal portion and a vertical portion, the horizontal portion is connected with the stand column, the vertical portion is perpendicular to the ground, one end, far away from the horizontal portion, of the vertical portion extends towards the direction far away from the ground, a connecting groove is formed in the position, corresponding to the vertical portion, of the steel rail, and the vertical portion penetrates through the middle frame and is buckled with the connecting groove.

Through adopting above-mentioned technical scheme, when middle frame was placed on the supporting part, vertical portion and spread groove lock for the stand is connected with middle frame once more through vertical portion, reduces the phenomenon that the skew appears in the relative post in position of middle frame.

Optionally, a protruding block is arranged at one end, close to the connecting groove, of the vertical portion, a protruding groove is formed in the connecting groove and corresponds to the protruding block, the protruding groove is arranged towards the direction of the stand column, the horizontal portion is arranged on the middle frame in a sliding mode along the horizontal direction, and the protruding block and the protruding groove are buckled.

Through adopting above-mentioned technical scheme, after vertical portion and spread groove lock, through lug and tongue lock once more, restrict fixedly to the position of vertical portion, further promote the joint strength between vertical portion and the intermediate frame.

Optionally, be provided with the adjusting part who is used for adjusting horizontal part position on the stand, the adjusting part is including adjusting pole and dwang, the dwang runs through the stand setting, the dwang rotates the setting on the stand, it slides the setting along the direction towards the horizontal part to adjust the pole on the stand, be provided with the sloping block that is used for driving the horizontal part and removes on the horizontal part, the tip of adjusting the pole and the inclined plane butt of sloping block, the one end of dwang is close to the supporting part setting, and the one end tip butt of sloping block is kept away from to the other end and regulation pole.

Through adopting above-mentioned technical scheme, when placing middle frame, the bottom and the dwang butt of middle frame to drive the dwang and rotate on the stand, the dwang drives the regulation pole and removes, and the regulation pole drives the horizontal part through the sloping block and removes, and then adjusts the position of vertical portion, so that lug and tongue lock.

Optionally, the tip setting of dwang is kept away from one side on ground at the supporting part, the groove of stepping down has been seted up with the position that the dwang corresponds on the supporting part, the dwang is connected with the groove lock fit of stepping down.

Through adopting above-mentioned technical scheme, putting the back on the supporting part with middle frame, the dwang rotates to the inslot of stepping down, reduces the dwang and appears interfering the phenomenon of middle frame bottom and supporting part butt.

Optionally, one end of the convex groove close to the upright post is obliquely arranged towards the direction far away from the ground.

Through adopting above-mentioned technical scheme, set up the tongue slope setting to when middle frame removes towards the supporting part, the lug can be along horizontal migration to with the tongue lock, fix the position of middle frame.

Optionally, the stopper slides along the direction towards the fixed block in spacing portion and sets up, the spout has been seted up in spacing portion, the position that corresponds with the spout on the stopper is provided with the slider, the slider card is established in the spout, the slider slides in the spout and sets up.

Through adopting above-mentioned technical scheme, when middle frame is placed on the bracing piece, slip stopper to stopper and fixed block lock, then fix through limiting screw, set up slider and spout lock simultaneously, promote the stability of connecting between stopper and the spacing portion.

Optionally, a clamping plate is arranged at a position, corresponding to the limiting screw, on the middle frame, a clamping groove is formed in the clamping plate, a clamping rod is integrally arranged at the end of the limiting screw, and the clamping rod is clamped in the clamping groove.

Through adopting above-mentioned technical scheme, fix fixed block and stopper through screw-thread fit nut on stop screw, after stopper and intermediate block lock, will make joint pole and joint groove lock simultaneously passing stop screw in proper order, reduce when rotating the nut to stop screw on, stop screw appears pivoted phenomenon.

Drawings

FIG. 1 is a schematic structural diagram of a large-tonnage crane factory building steel structure of the embodiment of the application.

FIG. 2 is a partial view of a large tonnage crane factory building steel structure of the embodiment of the application.

FIG. 3 is a schematic structural diagram of the clamping piece in the steel structure of the large-tonnage crane factory building in the embodiment of the application.

FIG. 4 is a schematic structural diagram of another view angle of the large-tonnage crane factory steel structure clamping piece according to the embodiment of the application.

FIG. 5 is a schematic structural diagram of a limiting assembly in a steel structure of a large-tonnage crane factory building according to an embodiment of the application.

FIG. 6 is a schematic structural diagram of an adjusting assembly in a steel structure of a large-tonnage crane factory building according to an embodiment of the application.

FIG. 7 is a schematic structural diagram of a middle frame in a steel structure of a large-tonnage crane factory building according to an embodiment of the application.

FIG. 8 is a schematic structural diagram of a buckle rod in a steel structure of a large-tonnage crane factory building according to an embodiment of the application.

Reference numerals: 1. a column; 11. a crane; 12. a reinforcing bar; 13. connecting holes; 2. a steel rail; 3. a fastener; 31. a connecting rod; 311. a bending section; 32. a support portion; 321. a yielding groove; 33. an abutting portion; 34. a limiting part; 341. a chute; 4. a middle frame; 41. a sloping plate; 42. a fixed block; 43. connecting grooves; 44. a convex groove; 5. a limiting component; 51. a limiting block; 511. a slot; 512. a slider; 52. a limit screw; 521. a clamping and connecting rod; 6. a clamping and connecting plate; 61. a clamping groove; 7. a buckle rod; 71. a horizontal portion; 711. a sloping block; 72. a vertical portion; 721. a bump; 8. an adjustment assembly; 81. adjusting a rod; 82. rotating the rod.

Detailed Description

The present application is described in further detail below with reference to figures 1-8.

The application discloses a large-tonnage crane factory building steel construction. Referring to fig. 1, large-tonnage crane factory building steel construction includes multiunit stand 1 and sets up rail 2 on stand 1, and crane 11 sets up between two sets of adjacent stands 1, and every group stand 1 includes a plurality of stands 1, and a plurality of stands 1 set up along the length direction interval of rail 2, and stand 1 supports crane 11 through rail 2.

Referring to fig. 2 and 3, the upright post 1 is of an i-steel structure and is perpendicular to the ground, the clamping piece 3 is arranged on the upright post 1, the clamping piece 3 is arranged on one side, close to the steel rail 2, of the upright post 1, the side face of the clamping piece 3 is abutted to the upright post 1, and the clamping piece 3 is connected with the upright post 1 through a bolt. Fastener 3 and stand 1 pass through bolt fixed connection, and fastener 3 is the triangle form, and the two right-angle sides of fastener 3 are connected with stand 1 and rail 2 respectively. Be provided with stiffener 12 on stand 1, the one end setting of stiffener 12 is in the outside of fastener 3, and the other end passes and passes fastener 3 and stand 1 setting in proper order, is provided with the nut at the tip of stiffener 12, and the nut of stiffener 12 tip promotes the stability of being connected between fastener 3 and the stand 1 with fastener 3 and stand 1 butt respectively through stiffener 12. Be located stand 1 between two cranes 11, correspond respectively in the both sides of stand 1 and be provided with fastener 3, stand 1 and fastener 3 are passed in proper order to stiffener 12, then fix through the bolt, and then promote the stability of being connected between two fasteners 3 and the stand 1 simultaneously.

Referring to fig. 5 and 6, in order to install fastener 3 on stand 1, one side welded fastening who is close to stand 1 on fastener 3 is provided with connecting rod 31, connecting rod 31 sets up the edge of keeping away from ground one side at fastener 3, the one end that fastener 3 was kept away from to connecting rod 31 is kink 311 to the direction of keeping away from ground buckling, connecting hole 13 has been seted up on stand 1, connecting hole 13 and connecting rod 31 correspond the setting, when the installation, insert kink 311 in stand 1 through connecting hole 13, and make kink 311 and stand 1 lateral wall butt, buckle fastener 3 on stand 1 through connecting hole 13, when strengthening the joint strength between fastener 3 and stand 1, fix fastener 3 in advance, so that fix fastener 3. Connecting rod 31 is provided with two along the horizontal direction, and two connecting rod 31 intervals set up, further promotes the stability of complex between fastener 3 and the stand 1 through setting up two connecting rod 31.

Referring to fig. 6 and 7, an intermediate frame 4 is fixedly welded on one side of a steel rail 2 close to a clamping piece 3, the intermediate frame 4 is arranged along the length direction of the steel rail 2, a supporting portion 32, an abutting portion 33 and a limiting portion 34 are integrally arranged on one side of the clamping piece 3 far away from the ground, the supporting portion 32 and the limiting portion 34 are arranged in parallel to the ground and are arranged at intervals in the horizontal and vertical directions, the limiting portion 34 is arranged on one side of the supporting portion 32 far away from the ground, two sides of the abutting portion 33 are respectively connected with the supporting portion 32 and the limiting portion 34, the abutting portion 33 is obliquely arranged, the clamping piece 3 is connected with the intermediate frame 4 through the supporting portion 32, the intermediate frame 4 is arranged as an i-shaped steel, the bottom of the intermediate frame 4 is abutted against the supporting portion 32, an inclined plate 41 is arranged on the intermediate frame 4, the inclined plate 41 is correspondingly arranged with the abutting portion 33, the, the inclined plate 41 is abutted against the abutting part 33, and simultaneously, under the action of the abutting part 33 and the inclined plate 41, the intermediate frame 4 is placed close to the upright post 1, so that one side of the intermediate frame 4 close to the upright post 1 is abutted against the upright post 1, the stable matching is realized, the installation efficiency is improved, and the inclined plate 41 is fixedly connected with the abutting part 33 through bolts.

Referring to fig. 7 and 8, be provided with spacing subassembly 5 on spacing portion 34, spacing subassembly 5 is used for promoting the stability of being connected between middle frame 4 and fastener 3, the position welding that corresponds with spacing subassembly 5 on middle frame 4 is provided with fixed block 42, spacing subassembly 5 includes stopper 51 and stop screw 52, stopper 51 and spacing portion 34 are connected, slot 511 has been seted up with the position that fixed block 42 corresponds on stopper 51, fixed block 42 inserts and establishes in slot 511, stop screw 52 runs through stopper 51 in proper order, fixed block 42 and middle frame 4 set up, the tip screw-thread fit at stop screw 52 has the nut, through rotating the nut to with stopper 51 butt, and then fix stopper 51 and fixed block 42.

Referring to fig. 8, two limit screws 52 are spaced apart from each other on the limit block 51, and the stability of the fit between the limit block 51 and the fixing block 42 is improved by the two limit screws 52. For the convenience of installation, a clamping plate 6 is welded on the middle frame 4 at a position corresponding to the limit screw 52, a clamping rod 521 is integrally arranged at the end of the limit screw 52, the clamping rod 521 is perpendicular to the limit screw 52, the clamping rod 521 and the clamping plate 6 are correspondingly arranged, a clamping groove 61 is formed in the clamping plate 6, the clamping rod 521 is clamped in the clamping groove 61, and when the installation is carried out, the limit screw 52 sequentially penetrates through the middle frame 4 through the clamping groove 61. Fixed block 42 and stopper 51 are injectd limit screw 52's position until joint pole 521 and joint groove 61 lock, reduce when swivel nut, and pivoted phenomenon appears in limit screw 52, promotes assembly efficiency.

Referring to fig. 5 and 6, in order to facilitate the matching between the limiting block 51 and the fixing block 42, the limiting block 51 is arranged on the limiting block 51 in a sliding manner along the direction toward the fixing block 42, a sliding groove 341 is formed in a position corresponding to the limiting block 51 on the limiting portion 34, a sliding block 512 is fixedly welded on the limiting block 51, the sliding block 512 is arranged in the sliding groove 341 in a sliding manner, the sliding block 512 extends to the outside of the sliding groove 341 to be connected with the limiting block 51, when the sliding block 512 is installed, the sliding block 512 is inserted into the sliding groove 341, then the limiting block 51 slides, after the limiting block 51 moves to be abutted against the fixing block 42, the sliding block 512 moves to be abutted against the.

Referring to fig. 6 and 7, in order to improve the stability of the fit between the side of the middle frame 4 away from the limiting block 51 and the upright post 1, a fastening rod 7 is arranged at a position of the upright post 1 close to the middle frame 4, the fastening rod 7 is integrally provided with a horizontal portion 71 and a vertical portion 72, the horizontal portion 71 is connected with the upright post 1, the vertical portion 72 is arranged perpendicular to the ground, one end of the vertical portion 72, which is far away from the horizontal portion 71, extends in a direction far away from the ground, a connecting groove 43 is formed in a position, corresponding to the vertical portion 72, on the steel rail 2, the vertical portion 72 is connected with the connecting groove 43 in a fastening manner, after the middle frame 4 is placed on the supporting portion 32, the vertical portion 72 penetrates through the middle frame. The phenomenon of the middle frame 4 deviating is reduced, and the stability of the middle frame is improved.

Referring to fig. 6 and 7, in order to improve the stability of the fit between the vertical portion 72 and the middle frame 4, a protrusion 721 is disposed at one end of the vertical portion 72 away from the horizontal portion 71, a protruding groove 44 is disposed in the connecting groove 43 corresponding to the protrusion 721, the protruding groove 44 is communicated with the connecting groove 43, the protruding groove 44 is disposed toward the upright 1, the horizontal portion 71 is slidably disposed on the middle frame 4 along the horizontal direction, after the middle frame 4 is placed on the supporting portion 32, the sliding horizontal portion 71 drives the protrusion 721 to move through the vertical portion 72 until the protrusion 721 enters the protruding groove 44, and the protrusion 721 is engaged with the protruding groove 44, so as to improve the stability of the fit between the vertical portion 72 and the middle frame 4.

Referring to fig. 6 and 7, an adjusting assembly 8 for adjusting the position of the horizontal portion 71 is disposed on the vertical column 1, the adjusting assembly 8 includes an adjusting rod 81 and a rotating rod 82, the rotating rod 82 is disposed through the vertical column 1, the rotating rod 82 is disposed adjacent to the supporting portion 32, the adjusting rod 81 is slidably disposed in a direction perpendicular to the ground, the rotating rod 82 and the horizontal portion 71 are disposed at an interval, the adjusting rod 81 is disposed between the horizontal portion 71 and the rotating rod 82, an inclined block 711 is disposed at one end of the horizontal portion 71 adjacent to the adjusting rod 81, a guide surface is disposed at one side of the inclined block 711 adjacent to the adjusting rod 81, an end portion of the adjusting rod 81 abuts against the guide surface, a side end portion of one. When the middle frame 4 is placed on the supporting portion 32 during installation, the middle frame 4 abuts against the rotating rod 82, the middle frame 4 continues to move to drive the rotating rod 82 to rotate, the rotating rod 82 rotates to drive the adjusting rod 81 to move, the adjusting rod 81 moves to drive the horizontal portion 71 to move through the guide surface, and after the middle frame 4 is placed on the supporting portion 32, the projection 721 is inserted into the convex groove 44, so that the installation efficiency is improved.

Referring to fig. 6, the support portion 32 is provided with an avoiding groove 321 at a position corresponding to the rotating lever 82, the avoiding groove 321 is provided corresponding to the rotating lever 82, and after the protrusion 721 is engaged with the convex groove 44, the rotating lever 82 rotates into the avoiding groove 321, thereby reducing the interference of the rotating lever 82 with the middle frame 4 and the support portion 32. The end of the groove 44 close to the upright 1 is inclined in the direction away from the ground, so that when the middle frame 4 moves towards the support part 32, the projection 721 moves horizontally to engage with the groove 44.

The implementation principle of the application is as follows: install stand 1 on stand 1 through knot pole 7 and bolt, then fix through stiffener 12, place rail 2 in the backup pad through intermediate frame 4, it is fixed with butt portion 33 butt of swash plate 41 simultaneously, then through stopper 51 and fixed block 42 lock to fix through stop screw 52, fix rail 2 on fastener 3, and then promote the stability of being connected between rail 2 and the fastener 3, promote the installation effectiveness simultaneously.

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 (10)

1. The utility model provides a large-tonnage crane factory building steel construction, includes multiunit stand (1) and sets up rail (2) that are used for crane (11) on stand (1) to remove, is provided with fastener (3), its characterized in that in one side that stand (1) is close to rail (2): fastener (3) are provided with near rail (2) one side in stand (1), be provided with connecting rod (31) on fastener (3), the one end bending type that fastener (3) were kept away from in connecting rod (31) forms kink (311) that are used for fixed fastener (3), kink (311) and stand (1) are connected, be provided with intermediate frame (4) between rail (2) and fastener (3), be provided with spacing subassembly (5) that are used for promoting between intermediate frame (4) and fastener (3) joint strength on fastener (3), the position that stand (1) is close to intermediate frame (4) is provided with detains pole (7), detain pole (7) and intermediate frame (4) and keep away from one side of spacing subassembly (5) and connect.

2. The large tonnage crane plant steel structure of claim 1, characterized in that: one side an organic whole that fastener (3) are close to middle frame (4) is provided with supporting part (32), butt portion (33) and spacing portion (34), supporting part (32) and spacing portion (34) all are on a parallel with ground and set up, even interval setting in horizontal direction and vertical direction in supporting part (32) and spacing portion (34), the both sides of butt portion (33) are connected with supporting part (32) and spacing portion (34) respectively, middle frame (4) and supporting part (32) are connected, be provided with swash plate (41) on middle frame (4), swash plate (41) and butt portion (33) butt.

3. The large tonnage crane plant steel structure of claim 2, characterized in that: fixed block (42) are fixedly arranged on the middle frame (4), the limiting assembly (5) comprises a limiting block (51) and a limiting screw (52), the limiting block (51) is connected with the abutting part (33), a slot (511) is formed in the limiting block (51), the fixing block (42) is inserted into the slot (511), and the limiting screw (52) is fixed in the fixing block (42) and the limiting block (51) in a penetrating mode.

4. The large tonnage crane plant steel structure of claim 3, characterized in that: detain pole (7) an organic whole and be provided with horizontal part (71) and vertical portion (72), horizontal part (71) and stand (1) are connected, vertical portion (72) perpendicular to ground sets up, the one end that horizontal part (71) were kept away from in vertical portion (72) extends to the direction of keeping away from ground, connecting groove (43) have been seted up with the position that vertical portion (72) correspond on rail (2), vertical portion (72) pass intermediate frame (4) and connecting groove (43) lock.

5. The large tonnage crane plant steel structure of claim 4, characterized in that: the vertical part (72) is provided with a convex block (721) near one end of the connecting groove (43), a convex groove (44) is formed in the connecting groove (43) and corresponds to the convex block (721), the convex groove (44) is arranged towards the direction of the upright post (1), the horizontal part (71) is arranged on the middle frame (4) in a sliding mode along the horizontal direction, and the convex block (721) is buckled with the convex groove (44).

6. The large tonnage crane plant steel structure of claim 5, characterized in that: be provided with adjusting part (8) that are used for adjusting horizontal part (71) position on stand (1), adjusting part (8) are including adjusting pole (81) and dwang (82), dwang (82) run through stand (1) and set up, dwang (82) rotate the setting on stand (1), adjust pole (81) and set up along the direction slip towards horizontal part (71) on stand (1), be provided with sloping block (711) that are used for driving horizontal part (71) to remove on horizontal part (71), the tip of adjusting pole (81) and the inclined plane butt of sloping block (711), the one end of dwang (82) is close to supporting part (32) and sets up, and the one end tip butt of sloping block (711) is kept away from to the other end and adjust pole (81).

7. The large tonnage crane plant steel structure of claim 6, characterized in that: the tip setting of dwang (82) keeps away from one side on ground at supporting part (32), groove of stepping down (321) have been seted up with the position that dwang (82) corresponds on supporting part (32), dwang (82) and groove of stepping down (321) lock fit are connected.

8. The large tonnage crane plant steel structure of claim 6, characterized in that: one end of the convex groove (44) close to the upright post (1) is obliquely arranged towards the direction far away from the ground.

9. The large tonnage crane plant steel structure of claim 3, characterized in that: stopper (51) are along the direction slip setting towards fixed block (42) on spacing portion (34), spout (341) have been seted up on spacing portion (34), the position that corresponds with spout (341) on stopper (51) is provided with slider (512), slider (512) card is established in spout (341), slider (512) slide in spout (341) and set up.

10. The large tonnage crane plant steel structure of claim 9, characterized in that: the middle frame (4) is provided with a clamping plate (6) at a position corresponding to the limiting screw rod (52), a clamping groove (61) is formed in the clamping plate (6), the end part of the limiting screw rod (52) is integrally provided with a clamping rod (521), and the clamping rod (521) is clamped in the clamping groove (61).

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