CN115432048A - Folding type logistics package transfer trolley and transfer method thereof - Google Patents

Abstract

The invention belongs to the technical field of transfer trolleys, and discloses a folding type logistics package transfer trolley which comprises a fixed support, wherein one side of the fixed support is connected with an expanding support assembly, a fixed plate is fixedly arranged at the top of the fixed support, a positioning plate is fixedly arranged at one end, far away from the fixed plate, of the top of the expanding support assembly, a plurality of expanding bearing assemblies and a sliding connecting piece are arranged at the top of the expanding support assembly and located between the fixed plate and the positioning plate, and one end of the sliding connecting piece is fixedly connected to the side face of each expanding bearing assembly. The invention can conveniently change the whole supporting range of the trolley through the fixed support and the expanded supporting component, and further along the whole supporting range of the trolley under the coordination of the expanded supporting component and the sliding connecting piece, thereby not only increasing the application range of the trolley, but also being convenient for matching the trolley with the size specification of the transferred goods so as to be convenient for stably transferring the goods in a short distance through the trolley.

Description

Folding type logistics package transfer trolley and transfer method thereof

Technical Field

The invention belongs to the technical field of transfer trolleys, and particularly relates to a folding type logistics package transfer trolley and a transfer method thereof.

Background

At present, express delivery logistics industry rapid development makes the commodity circulation transportation volume increase in a large number, make commodity circulation practitioner's work load increase day by day, and the transfer of numerous commodity circulation express delivery parcel needs the transfer platform truck to carry out short transfer, the transfer platform truck that uses among the prior art also can reach the purpose of transferring the goods, and mostly there is foldability portable transfer, but because the specification and dimension scope of express delivery goods is great in the in-service use, and the transfer platform truck specification that uses among the prior art is fixed, can't be applicable to and shift the goods that size specification is bigger, need the staff to know the size specification of goods in advance so that choose the transfer platform truck that is suitable for, but the actual conditions of express delivery industry is the size specification of a car goods not of uniform size, and the transport vechicle obviously can't be equipped with the transfer platform truck of multiple specification simultaneously, this causes inconvenience for actual transfer work, consequently, need improve it.

Therefore, a wide-range foldable logistics package transfer platform needs to be developed.

Disclosure of Invention

The invention aims to provide a folding type logistics package transfer trolley and a transfer method thereof, and aims to solve the problems in the background art.

In order to achieve the above purpose, the invention provides the following technical scheme: the utility model provides a foldable commodity circulation parcel transfer platform truck, includes the fixed bolster, one side of fixed bolster is connected with extends supporting component, the top fixed mounting of fixed bolster has the fixed plate, the one end fixed mounting that the fixed plate was kept away from at the top of extending supporting component has the locating plate, the top of extending supporting component is provided with a plurality of extensions bearing component and the connecting piece that slides that is located between fixed plate and the locating plate, the one end fixed connection of the connecting piece that slides in the side of extending bearing component, the other end of the connecting piece that slides is pegged graft in the inside of adjacent extension bearing component, one side that the locating plate was kept away from at the top of fixed plate articulates there is the removal subassembly, the inside joint of extending bearing component has location locking subassembly, the fixed bolster is provided with the gyro wheel with the bottom of extending supporting component.

Preferably, extend the supporting component including swing joint in the extension support of fixed bolster one end, extend the top and the locating plate fixed connection of support, extend the support surface and be close to the one end of fixed bolster and seted up the joint groove, the spacing groove has been seted up to the bottom of joint inslot chamber, the inside in joint groove slides and is connected with the support that slides, the one end of the support that slides runs through the joint groove and with fixed bolster fixed connection, the other end fixedly connected with of the support that slides and connects in the slider of joint inslot portion, the bottom fixedly connected with stopper of slider, the stopper slides and connects in the inside in spacing groove.

Preferably, the expanding support component comprises an expanding support plate arranged at the top of the expanding support component, connecting grooves are formed in the expanding support plate and one side, close to the positioning plate, of the fixing plate, and the bottom of the expanding support plate is in contact with an expanding support and a sliding support.

Preferably, the sliding connection piece comprises a connection plate inserted in the connection groove, anti-falling blocks are fixedly connected to the front side and the rear side of one end, close to the fixed plate, of the connection plate, the anti-falling blocks are clamped in the expanding bearing plate, and the bottom of the connection plate is in contact with the expanding support and the sliding support.

Preferably, the moving assembly comprises a connecting frame hinged to the top of the fixing plate, the moving frame is arranged at the top of the connecting frame, a limiting slide rod is movably sleeved inside the moving frame, and the bottom of the limiting slide rod penetrates through the moving frame and is fixedly connected with the connecting frame.

Preferably, the top fixed mounting of link has a plurality of connecting rods of evenly distributed, is located the left and right sides the top of connecting rod is provided with the adapter sleeve, the top of adapter sleeve is connected with the removal frame, the inside activity of adapter sleeve has cup jointed the location slide bar, the bottom of location slide bar run through the adapter sleeve and with connecting rod fixed connection.

Preferably, be located the middle part the top of connecting rod is provided with threaded sleeve, threaded sleeve's top is run through and is removed frame and fixedly connected with ball soon, the rotatory joint of threaded sleeve is in the inside that removes the frame, threaded sleeve's internal thread has cup jointed the lead screw, the bottom of lead screw run through threaded sleeve and with the connecting rod fixed connection who is located the middle part.

Preferably, mutually-communicated locking grooves are formed in the tops of the fixing plate and the expanded bearing plate, and locking teeth are uniformly distributed on the front side and the rear side of an inner cavity of each locking groove.

Preferably, location locking subassembly is including the lock plate of joint in locking inslot portion and locking tooth top, the groove of drawing is seted up at the top of lock plate, the bottom fixedly connected with locking tooth of lock plate, locking tooth and locking tooth intermeshing.

Preferably, the method comprises the following steps:

s1, turning over a moving frame to enable a moving assembly to integrally rotate to a required angle, fixing the moving assembly, and moving equipment to a cargo transferring area through the moving assembly;

s2, taking down the positioning locking assembly through the lifting groove, and pulling the fixing plate and the positioning plate to two sides to respectively drive the fixing support and the expanding support to move back to back;

s3, pulling the sliding support to increase the overall length of the fixed support and the expanding support assembly due to the fact that the fixed support and the expanding support move back to back;

s4, the connecting plate drives the anti-falling blocks to slide along the inner parts of the adjacent connecting grooves due to the gradual distance between the fixing plate and the positioning plate;

s5, after the plurality of expanded bearing assemblies and the sliding connecting piece move, stopping pulling the fixed plate and the positioning plate back to back after the sizes of the tops of the fixed plate, the positioning plate and the expanded bearing assemblies reach the size required by goods transferring;

s6, clamping the positioning and locking assembly into the locking groove again through the lifting groove, so that the lifting groove and the locking teeth can be meshed with each other to lock the fixing plate, the positioning plate and the expanded bearing assembly;

and S7, rotating the rotary ball to drive the threaded sleeve to rotate, and then enabling the threaded sleeve to drive the movable frame to integrally move up and down under the matching of the screw rod.

The invention has the following beneficial effects:

1. the invention can conveniently change the whole supporting range of the trolley through the fixed support and the expanded supporting component, and further along the whole supporting range of the trolley under the coordination of the expanded supporting component and the sliding connecting piece, thereby not only increasing the application range of the trolley, but also being convenient for matching the trolley with the size specification of the transferred goods so as to be convenient for stably transferring the goods in a short distance through the trolley.

2. According to the invention, the positioning locking assembly can be conveniently dismounted and mounted by a worker at any time through the lifting groove, and then the effects of locking the adjacent expanded bearing assembly and the fixing plate or the positioning plate are achieved under the mutual meshing action of the locking teeth and the locking teeth, so that the whole bearing specifications of the adjusted rear fixing plate, the positioning plate and the expanded bearing assembly can be fixed all the time, and the great obstruction to the movement of the worker during cargo transfer is avoided.

3. The invention can conveniently adjust the overall height of the connecting frame and the moving frame under the matching of the threaded sleeve and the screw rod through the rotary ball, so as to provide a certain supporting effect for goods needing short-distance transfer, facilitate the quick stacking of the goods, improve the transfer efficiency, effectively reduce the stability of the goods during the transfer and reduce the probability of goods toppling and damaging.

Drawings

FIG. 1 is a schematic view of the main body of the present invention;

FIG. 2 is a top view of the present invention;

FIG. 3 is a side cross-sectional view of the mobile frame of the present invention;

FIG. 4 is a front cross-sectional view of the latch plate of the present invention;

FIG. 5 is an enlarged view of a portion of FIG. 4 at A;

FIG. 6 is a schematic view of the connection of the expanded support assembly to the glide connection;

FIG. 7 is a schematic structural view of a stent according to the present invention;

FIG. 8 is a disassembled view of the stand of the present invention;

FIG. 9 is a schematic view of the articulation of the expansion support assembly.

In the figure: 1. fixing a bracket; 2. expanding the supporting component; 21. expanding a bracket; 22. a clamping groove; 23. a limiting groove; 24. a slider; 25. a limiting block; 26. a slipping bracket; 3. a fixing plate; 4. positioning a plate; 5. an expanded supporting component; 51. expanding a bearing plate; 52. connecting grooves; 6. a sliding connector; 61. a connecting plate; 62. an anti-drop block; 7. a moving assembly; 71. a connecting frame; 72. a movable frame; 73. a limiting slide bar; 74. a connecting rod; 75. connecting sleeves; 76. positioning a sliding rod; 77. a threaded bushing; 78. rotating the ball; 79. a screw rod; 8. positioning the locking assembly; 81. a lock plate; 82. lifting the groove; 83. locking the teeth; 9. a roller; 10. a locking groove; 11. locking teeth.

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.

As shown in fig. 1 to 9, an embodiment of the invention provides a foldable logistics package transfer trolley, which includes a fixed support 1, one side of the fixed support 1 is connected with an extended support component 2, the top of the fixed support 1 is fixedly provided with a fixed plate 3, one end of the top of the extended support component 2, which is far away from the fixed plate 3, is fixedly provided with a positioning plate 4, the top of the extended support component 2 is provided with a plurality of extended support components 5 and sliding connecting pieces 6, which are located between the fixed plate 3 and the positioning plate 4, one end of each sliding connecting piece 6 is fixedly connected to a side surface of each extended support component 5, the other end of each sliding connecting piece 6 is inserted into the corresponding adjacent extended support component 5, one side of the top of the fixed plate 3, which is far away from the positioning plate 4, is hinged with a moving component 7, the interior of each extended support component 5 is clamped with a positioning locking component 8, and the bottoms of the fixed support 1 and the extended support component 2 are provided with rollers 9;

can be convenient for change the holistic support range of platform truck through fixed bolster 1 and expansion supporting component 2, and then along the holistic bearing scope of platform truck under the cooperation of expanding supporting component 5 and sliding connection piece 6, not only increased its application scope, be convenient for make its and the size and specification looks adaptation that shifts the goods in addition to carry out steady short distance through the platform truck to the goods and shift.

As shown in fig. 9, the expanding support assembly 2 includes an expanding support 21 movably connected to one end of the fixing support 1, the top of the expanding support 21 is fixedly connected to the positioning plate 4, one end of the surface of the expanding support 21, which is close to the fixing support 1, is provided with a clamping groove 22, the bottom of the inner cavity of the clamping groove 22 is provided with a limiting groove 23, the inside of the clamping groove 22 is connected with a sliding support 26 in a sliding manner, one end of the sliding support 26 penetrates through the clamping groove 22 and is fixedly connected with the fixing support 1, the other end of the sliding support 26 is fixedly connected with a sliding block 24 connected in the clamping groove 22 in a sliding manner, the bottom of the sliding block 24 is fixedly connected with a limiting block 25, and the limiting block 25 is connected in the limiting groove 23 in a sliding manner;

the expansion bracket 21 and the sliding bracket 26 can be used for conveniently adjusting the whole supporting range of the fixed bracket 1 and the expansion supporting component 2, and can be used for continuously and stably supporting a plurality of expansion supporting components 5 under the matching of the expansion bracket 21 and the sliding bracket.

As shown in fig. 6, the extended supporting assembly 5 includes an extended supporting plate 51 disposed at the top of the extended supporting assembly 2, connecting slots 52 are formed on both the extended supporting plate 51 and one side of the fixing plate 3 close to the positioning plate 4, and the bottom of the extended supporting plate 51 is in contact with the extended bracket 21 and the sliding bracket 26;

can carry out the bearing to the goods through expanding bearing board 51, can change fixed plate 3, locating plate 4 and expand the holistic bearing scope of bearing subassembly 5 under the cooperation of connecting piece 6 that slides moreover to improve the platform truck to the transfer suitability of goods.

As shown in fig. 6, the sliding connection member 6 includes a connection plate 61 inserted into the connection groove 52, the connection plate 61 is fixedly connected with anti-falling blocks 62 at both front and rear sides of one end of the connection plate 3, the anti-falling blocks 62 are clamped inside the expanded support plate 51, and the bottom of the connection plate 61 contacts the expanded support 21 and the sliding support 26.

As shown in fig. 3, the moving assembly 7 includes a connecting frame 71 hinged to the top of the fixed plate 3, a moving frame 72 is disposed at the top of the connecting frame 71, a limiting slide rod 73 is movably sleeved inside the moving frame 72, and the bottom of the limiting slide rod 73 penetrates through the moving frame 72 and is fixedly connected with the connecting frame 71;

the goods can be conveniently blocked by the connecting frame 71 and the moving frame 72, the probability of goods toppling and damaging during transfer is reduced, and the trolley is convenient to move by workers.

As shown in fig. 3, a plurality of connecting rods 74 are fixedly installed at the top of the connecting frame 71, the connecting rods 74 are evenly distributed, connecting sleeves 75 are arranged at the tops of the connecting rods 74 located at the left and right sides, the top of the connecting sleeve 75 is connected with the moving frame 72, a positioning slide bar 76 is movably sleeved inside the connecting sleeve 75, and the bottom of the positioning slide bar 76 penetrates through the connecting sleeve 75 and is fixedly connected with the connecting rods 74;

the connecting rod 74, the connecting sleeve 75 and the positioning slide rod 76 can not only continuously connect the connecting frame 71 and the moving frame 72 to provide a limiting function for the movement of the connecting frame and the moving frame, but also facilitate the pulling of the moving assembly 7 by a worker, so as to achieve the effect of applying a pulling force to the fixing plate 3 as much as possible.

As shown in fig. 3, a threaded sleeve 77 is disposed at the top of the connecting rod 74 located at the middle part, the top of the threaded sleeve 77 penetrates through the moving frame 72 and is fixedly connected with a rotary ball 78, the threaded sleeve 77 is rotatably clamped inside the moving frame 72, a screw rod 79 is sleeved on an internal thread of the threaded sleeve 77, and the bottom of the screw rod 79 penetrates through the threaded sleeve 77 and is fixedly connected with the connecting rod 74 located at the middle part;

can be convenient for adjust link 71 and the holistic height of removal frame 72 through revolving ball 78 under the cooperation of threaded sleeve 77 and lead screw 79 to in order to carry out certain supporting effect for the goods that the short distance shifted of needs provides, stack fast in order to make things convenient for the goods, improve transfer efficiency, can effectively reduce the stationarity of goods during the transfer in addition, reduce the probability that the goods toppled over the damage.

As shown in fig. 5, the top of the fixing plate 3 and the top of the expanded supporting plate 51 are both provided with mutually communicated locking grooves 10, and the front side and the rear side of the inner cavity of each locking groove 10 are both provided with evenly distributed locking teeth 11;

through locking groove 10 not only can be convenient for install locking tooth 11 to realize the locking effect under locking tooth 83 intermeshing, owing to both sides around 11 locking of locking tooth and the locking groove 10 inner chamber, the middle part of locking groove 10 inside and locking tooth 11 is reserved gappedly promptly, so that the staff clears up the dust and the debris of locking groove 10 and locking tooth 11 department.

As shown in fig. 5, the positioning locking assembly 8 includes a locking plate 81 clamped inside the locking groove 10 and at the top of the locking teeth 11, a lifting groove 82 is formed at the top of the locking plate 81, the locking teeth 83 are fixedly connected to the bottom of the locking plate 81, and the locking teeth 83 are engaged with the locking teeth 11.

As shown in fig. 1 to 9, the method comprises the following steps:

s1, turning over a moving frame 72 to enable the moving assembly 7 to integrally rotate to a required angle, fixing the moving assembly 7, and moving the equipment to a goods transferring area through the moving assembly 7;

s2, the positioning locking assembly 8 is taken down through the lifting groove 82, and then the fixing plate 3 and the positioning plate 4 are pulled towards two sides to respectively drive the fixing support 1 and the expanding support 21 to move back to back;

s3, pulling the sliding support 26 to increase the overall length of the fixed support 1 and the expanding support assembly 2 due to the back-to-back movement of the fixed support 1 and the expanding support 21;

s4, as the fixed plate 3 and the positioning plate 4 are gradually separated, the connecting plate 61 drives the anti-falling block 62 to slide along the inner part of the adjacent connecting groove 52;

s5, after the plurality of expanding bearing assemblies 5 and the sliding connecting piece 6 move, the fixed plate 3, the positioning plate 4 and the expanding bearing assemblies 5 stop pulling the fixed plate 3 and the positioning plate 4 back to back after the top sizes of the fixed plate 3, the positioning plate 4 and the expanding bearing assemblies 5 reach the size required by goods transfer;

s6, the positioning locking assembly 8 is integrally clamped into the locking groove 10 again through the lifting groove 82, so that the lifting groove 82 and the locking teeth 11 can be meshed with each other to lock the fixing plate 3, the positioning plate 4 and the expanded supporting assembly 5;

s7, the screw thread sleeve 77 can be driven to rotate by rotating the rotary ball 78, and then the screw thread sleeve 77 drives the movable frame 72 to integrally move up and down under the matching of the screw rod 79.

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

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

Claims (10)

1. The utility model provides a foldable commodity circulation parcel transfer platform truck, includes fixed bolster (1), its characterized in that: one side of fixed bolster (1) is connected with extends supporting component (2), the top fixed mounting of fixed bolster (1) has fixed plate (3), the top of extending supporting component (2) is kept away from the one end fixed mounting of fixed plate (3) has locating plate (4), the top of extending supporting component (2) is provided with a plurality of extensions bearing component (5) and the connecting piece (6) that slides that are located between fixed plate (3) and locating plate (4), the one end fixed connection of the connecting piece (6) that slides is in the side of extending bearing component (5), the other end of the connecting piece that slides (6) is pegged graft in the inside of adjacent extension bearing component (5), one side that locating plate (4) were kept away from to the top of fixed plate (3) articulates there is removal subassembly (7), the inside joint of extending bearing component (5) has location locking subassembly (8), fixed bolster (1) and the bottom of extending supporting component (2) are provided with gyro wheel (9).

2. The foldable logistics parcel transfer trolley of claim 1, wherein: extend supporting component (2) including swing joint in the expansion support (21) of fixed bolster (1) one end, the top and locating plate (4) fixed connection of expansion support (21), expansion support (21) surface is close to the one end of fixed bolster (1) and has seted up joint groove (22), spacing groove (23) have been seted up to the bottom of joint groove (22) inner chamber, the inside of joint groove (22) is slided and is connected with sliding bracket (26), the one end of sliding bracket (26) run through joint groove (22) and with fixed bolster (1) fixed connection, the other end fixedly connected with of sliding bracket (26) slides and connects in inside slider (24) of joint groove (22), the bottom fixedly connected with stopper (25) of slider (24), stopper (25) slide and connect in the inside of spacing groove (23).

3. The foldable logistic package transfer trolley according to claim 2, wherein: the expanding support component (5) comprises an expanding support plate (51) arranged at the top of the expanding support component (2), connecting grooves (52) are formed in the sides, close to the positioning plate (4), of the expanding support plate (51) and the fixing plate (3), and the bottom of the expanding support plate (51) is in contact with an expanding support (21) and a sliding support (26).

4. The foldable logistic package transfer trolley according to claim 3, wherein: the sliding connecting piece (6) comprises a connecting plate (61) inserted in a connecting groove (52), wherein the connecting plate (61) is close to one end of a fixing plate (3) and is fixedly connected with anti-falling blocks (62) on the front side and the rear side, the anti-falling blocks (62) are connected to the inside of an expanding bearing plate (51) in a clamped mode, and the bottom of the connecting plate (61) is in contact with an expanding support (21) and a sliding support (26).

5. The foldable logistics parcel transfer trolley of claim 1, wherein: the moving assembly (7) comprises a connecting frame (71) hinged to the top of the fixing plate (3), a moving frame (72) is arranged at the top of the connecting frame (71), a limiting slide rod (73) is movably sleeved in the moving frame (72), and the bottom of the limiting slide rod (73) penetrates through the moving frame (72) and is fixedly connected with the connecting frame (71).

6. The foldable logistics parcel transfer trolley of claim 5, wherein: the top fixed mounting of link (71) has a plurality of connecting rods (74) of evenly distributed, is located the left and right sides the top of connecting rod (74) is provided with adapter sleeve (75), the top of adapter sleeve (75) is connected with removal frame (72), location slide bar (76) have been cup jointed in the inside activity of adapter sleeve (75), the bottom of location slide bar (76) run through adapter sleeve (75) and with connecting rod (74) fixed connection.

7. The foldable logistics parcel transfer trolley of claim 6, wherein: be located the middle part the top of connecting rod (74) is provided with threaded sleeve pipe (77), the top of threaded sleeve pipe (77) is run through and is removed frame (72) and fixedly connected with and revolve ball (78), the rotatory joint of threaded sleeve pipe (77) is in the inside that removes frame (72), the internal thread of threaded sleeve pipe (77) has cup jointed lead screw (79), the bottom of lead screw (79) run through threaded sleeve pipe (77) and with connecting rod (74) fixed connection who is located the middle part.

8. The foldable logistics parcel transfer trolley of claim 3, wherein: the top of fixed plate (3) and expansion bearing plate (51) is all seted up locking groove (10) of mutual intercommunication, both sides all are provided with evenly distributed's locking tooth (11) around locking groove (10) inner chamber.

9. The foldable logistics parcel transfer trolley of claim 8, wherein: location locking subassembly (8) including joint in locking groove (10) inside and locking tooth locking plate (81) at tooth (11) top, pull-up groove (82) have been seted up at the top of locking plate (81), the bottom fixedly connected with locking tooth (83) of locking plate (81), locking tooth (83) and locking tooth (11) intermeshing.

10. The method for transferring the foldable logistic package transfer trolley according to the claims 1 to 9, which is characterized by comprising the following steps:

s1, turning over a moving frame (72) to enable a moving assembly (7) to integrally rotate to a required angle, fixing the moving assembly, and moving equipment to a cargo transferring area through the moving assembly (7);

s2, taking down the positioning locking assembly (8) through the lifting groove (82), and pulling the fixing plate (3) and the positioning plate (4) to two sides to enable the fixing plate and the positioning plate to respectively drive the fixing support (1) and the expanding support (21) to move back and forth;

s3, pulling the sliding support (26) due to the fact that the fixed support (1) and the expansion support (21) move back to enable the whole length of the fixed support (1) and the expansion support component (2) to be increased;

s4, the connecting plate (61) drives the anti-falling block (62) to slide along the inner part of the adjacent connecting groove (52) due to the gradual distance between the fixing plate (3) and the positioning plate (4);

s5, after the plurality of expansion bearing assemblies (5) and the sliding connecting piece (6) move, the fixed plate (3), the positioning plate (4) and the expansion bearing assemblies (5) stop pulling the fixed plate (3) and the positioning plate (4) back to back after the top sizes of the fixed plate (3), the positioning plate (4) and the expansion bearing assemblies (5) reach the size required by the transferred goods;

s6, clamping the whole positioning locking assembly (8) into the locking groove (10) through the lifting groove (82) again, so that the lifting groove (82) and the locking teeth (11) can be meshed with each other to lock the fixing plate (3), the positioning plate (4) and the expanded bearing assembly (5);

s7, the rotating ball (78) is rotated to drive the threaded sleeve (77) to rotate, and then the threaded sleeve (77) drives the moving frame (72) to integrally move up and down under the matching of the screw rod (79).

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