CN213653390U

CN213653390U - Lifting device for mounting water conservancy gate

Info

Publication number: CN213653390U
Application number: CN202022572783.4U
Authority: CN
Inventors: 徐孝军; 吴连为; 吴雪; 桂笑娜
Original assignee: Anhui Rencheng Construction Engineering Co ltd
Current assignee: Anhui Rencheng Construction Engineering Co ltd
Priority date: 2020-11-09
Filing date: 2020-11-09
Publication date: 2021-07-09
Anticipated expiration: 2030-11-09

Abstract

The application relates to a lifting device is used in water sluicegate installation, including support column, gyro wheel, slide rail and hoist engine, its characterized in that: the support column is provided with a braking device, the braking device comprises a braking box, a braking block, a braking motor, a lead screw and a friction block, the braking box is fixedly connected to the side wall of the support column, the interior of the braking box is hollow, and the bottom side of the braking box is provided with an opening; the brake block is connected to the inner side wall of the brake box in a sliding mode, an installation groove is formed in the bottom side of the brake block, the brake motor is installed on the top side of the brake box, the lead screw is connected to the brake block in a threaded mode, the lead screw is connected to the side wall of the top side of the brake box in a rotating mode, one end of the lead screw is fixedly connected to the end portion of an output shaft of the brake motor, the friction block is connected to the installation groove; the brake device further comprises a fixing mechanism for fixing the friction block. This application has the effect that prevents the gyro wheel and remove on the slide rail.

Description

Lifting device for mounting water conservancy gate

Technical Field

The application relates to lifting device technical field, especially relates to a lifting device is used in water sluicegate installation.

Background

Along with hydraulic engineering's continuous development, often need to utilize lifting device to promote the gate and install at hydraulic engineering.

The utility model discloses a correlation technique can refer to the grant publication number for CN207121363U china utility model patent, it discloses a lifting device is used in installation of power station gate, including solar cell panel, the gate pier, the hoist engine, crossbeam and battery, the intermediate position department on crossbeam top installs the battery box, and the battery is installed to the inside bottom of battery box, the support frame is installed on the top of battery box, and solar cell panel is installed on the top of support frame, the hoist engine is all installed to the both sides on crossbeam top, and the hoist engine is kept away from the top of battery box one side and all installs the flashing light that exposes to the sun, the support column is all installed to the bottom of crossbeam both sides, and the pulley is all installed to the bottom of support column. The support column is all installed to the bottom of crossbeam both sides, and the pulley is all installed to the bottom of support column, and driving motor is all installed in the outside of pulley, and the gate pier is all installed to the bottom of support column, and the top of gate pier install with the slide rail of pulley mutually supporting.

With respect to the related art among the above, the inventors consider that the following drawbacks exist: among the above-mentioned technical scheme, when the pulley rotates and rolls on the slide rail, be not convenient for brake the pulley.

SUMMERY OF THE UTILITY MODEL

In order to facilitate the braking to the pulley, this application provides a lifting device for water sluicegate installation.

The application provides a pair of lifting device is used in water sluicegate installation adopts following technical scheme:

a hoisting device for installing a water conservancy gate comprises a supporting column, a roller, a sliding rail and a winch, wherein a braking device is installed on the supporting column, the braking device comprises a braking box, a braking block, a braking motor, a lead screw and a friction block, the braking box is fixedly connected to the side wall of the supporting column, the braking box is hollow, and the bottom side of the braking box is provided with an opening; the brake block is connected to the inner side wall of the brake box in a sliding mode, an installation groove is formed in the bottom side of the brake block, the brake motor is installed on the top side of the brake box, the lead screw is connected to the brake block in a threaded mode, the lead screw is connected to the side wall of the top side of the brake box in a rotating mode, one end of the lead screw is fixedly connected to the end portion of an output shaft of the brake motor, the friction block is inserted into the installation groove, and the friction block can be; the braking device also comprises a fixing mechanism for fixing the friction block.

Through adopting above-mentioned technical scheme, when needs prevent that the gyro wheel from removing on the slide rail, the output shaft through brake motor rotates and drives the lead screw rotation, and the lead screw rotates the vertical downstream of drive brake pads, and the vertical downstream of brake pads drives the vertical downstream of friction block, and until friction block and slide rail support tightly to reach the purpose that prevents the gyro wheel and remove on the slide rail.

Preferably, two opposite inner side walls of the mounting groove are respectively provided with a first through hole and a first sliding groove, the first through hole is arranged corresponding to the first sliding groove, the inner side of the first sliding groove is provided with a second through hole, the friction block is provided with a third through hole, the third through hole is arranged corresponding to the first through hole, the fixing mechanism comprises a fixing rod and a limiting block, the fixing rod sequentially penetrates through the first through hole and the third through hole and then is matched with the first sliding groove in an inserting manner, the fixing rod is provided with a limiting groove, the limiting block is connected to the second through hole in a sliding manner, and the limiting block is inserted in the limiting groove; the fixing mechanism further comprises a pushing assembly used for pushing the limiting block.

Through adopting above-mentioned technical scheme, when needs install the clutch blocks on the brake pads, earlier make the clutch blocks peg graft in the mounting groove through removing the clutch blocks, promote the stopper through promoting the subassembly to remove after that, make the stopper cunning to the second through-hole in, then through removing the dead lever, make the dead lever pass in proper order behind first through-hole and the third through-hole with first spout grafting cooperation, rethread promotion subassembly next promotes the stopper and pegs graft in the spacing groove, thereby reach the purpose of fixed dead lever, and then reach the purpose of fixed clutch blocks.

Preferably, the second spout has been seted up on the lateral wall of brake pad, the guide way has been seted up to the inside wall of second spout, the both ends of second through-hole communicate first spout and second spout respectively, it includes ejector pad, first spring and guide bar to promote the subassembly, ejector pad sliding connection is in the second spout, stopper fixed connection is in the bottom side of ejector pad, guide bar sliding connection is in the guide way, the one end fixed connection of guide bar is in one side of ejector pad, first spring housing is established on the guide bar, the one end fixed connection of first spring is in one side of ejector pad, other end fixed connection is in the lateral wall of second spout.

By adopting the technical scheme, when the limiting block needs to be vertically moved upwards, the pushing block is moved upwards vertically to drive the limiting block and the guide rod to vertically move upwards; when the external force is not applied to the push block any more, the first spring pushes the push block to move, and the push block moves to drive the limiting block to move, so that the purpose of conveniently moving the limiting block is achieved; through setting up the guide bar, be convenient for on the one hand to the ejector pad to lead, on the other hand reduces the possibility that takes place to squint to other directions when first spring is compressed.

Preferably, the elastic component is installed to the one end of first spout, elastic component includes baffle and second spring, baffle sliding connection is in first spout, the one end fixed connection of second spring is in the baffle, other end fixed connection in the tank bottom of first spout.

Through adopting above-mentioned technical scheme, in order to facilitate the dismantlement clutch blocks, break away from the spacing groove through removing the stopper earlier, then under the spring action of second spring, the second spring promotes the baffle and removes, the baffle removes and promotes the dead lever and removes for the dead lever is kept away from the first through-hole of one end protrusion of baffle, makes the position of spacing groove keep away from the stopper simultaneously, reduces the stopper and pegs graft in the possibility of spacing groove, thereby reach the purpose of convenient to detach dead lever, and then reach the purpose of convenient to detach clutch blocks.

Preferably, one side of the limiting block, which is close to the friction block, is provided with a first inclined plane, one side of the fixing rod, which is close to the baffle, is provided with a second inclined plane, and the first inclined plane is matched with the second inclined plane.

Through adopting above-mentioned technical scheme, peg graft in the in-process on first spout at the dead lever, first inclined plane contacts with the second inclined plane earlier, under the interact on first inclined plane and second inclined plane for the dead lever promotes the stopper and slides, thereby reduces the degree of difficulty that the dead lever was pegged graft in first spout.

Preferably, the outer side of the winch is fixedly connected with a protective cover, a top plate is arranged on the top side of the protective cover, and the top plate is connected with the protective cover through a bolt; and a fourth through hole is formed in the side wall of the protective cover, and the pull rope of the winch is communicated with the outside through the fourth through hole.

By adopting the technical scheme, the protective cover is arranged, so that the protection effect on the winch is facilitated; the top plate and the protective cover are connected through bolts, and the top plate is convenient to detach and maintain the winch.

Preferably, a first rolling member and a second rolling member are arranged on the inner side wall of the fourth through hole.

Through adopting above-mentioned technical scheme, through setting up first rolling member and second rolling member, can reduce the frictional force of hoist engine stay cord to fourth through-hole lateral wall to can prolong the life of hoist engine stay cord.

Preferably, the first rolling part comprises a rolling rod, two ends of the rolling rod are respectively rotatably connected to two opposite side walls of the fourth through hole, the second rolling part comprises a ball, and the ball is movably embedded in the side wall of the fourth through hole.

Through adopting above-mentioned technical scheme, through setting up roll rod and ball, become the rolling frictional force with sliding frictional force to reach the purpose that reduces frictional force.

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

1. when the roller needs to be prevented from moving on the sliding rail, the output shaft of the brake motor rotates to drive the screw rod to rotate, the screw rod rotates to drive the brake block to vertically move downwards, the brake block vertically moves downwards to drive the friction block to vertically move downwards until the friction block is tightly abutted against the sliding rail, and therefore the purpose of preventing the roller from moving on the sliding rail is achieved;

2. when the friction block needs to be installed on the brake block, the friction block is firstly moved to be inserted into the installation groove, then the pushing assembly pushes the limiting block to move, so that the limiting block slides into the second through hole, then the fixed rod is moved to be inserted and matched with the first sliding groove after sequentially passing through the first through hole and the third through hole, and then the pushing assembly pushes the limiting block to be inserted and matched with the limiting groove, so that the purpose of fixing the fixed rod is achieved, and the purpose of fixing the friction block is further achieved;

3. when the limiting block needs to be moved vertically upwards, the pushing block is moved vertically upwards to drive the limiting block and the guide rod to move vertically upwards; when the external force is not applied to the push block any more, the first spring pushes the push block to move, and the push block moves to drive the limiting block to move, so that the purpose of conveniently moving the limiting block is achieved; through setting up the guide bar, be convenient for on the one hand to the ejector pad to lead, on the other hand reduces the possibility that takes place to squint to other directions when first spring is compressed.

Drawings

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

FIG. 2 is a schematic structural view of a prominent braking device in an embodiment of the present application;

FIG. 3 is an enlarged view of portion A of FIG. 2;

fig. 4 is an exploded view of the shield and top plate in an embodiment of the present application.

Description of reference numerals: 1. a support pillar; 11. a roller; 12. a slide rail; 13. a winch; 14. a cross beam; 2. a braking device; 21. a brake box; 22. a brake pad; 221. mounting grooves; 222. a first through hole; 223. a first chute; 224. a second through hole; 225. a second chute; 226. a guide groove; 23. braking the motor; 24. a lead screw; 25. a friction block; 251. a third through hole; 26. a fixing mechanism; 261. fixing the rod; 2611. a limiting groove; 2612. a second inclined plane; 262. a limiting block; 2621. a first inclined plane; 263. a pushing assembly; 2631. a push block; 2632. a first spring; 2633. a guide bar; 3. an elastic component; 31. a baffle plate; 32. a second spring; 4. a protective cover; 41. a top plate; 42. a bolt; 43. a fourth via hole; 44. a first rolling member; 45. a second rolling member.

Detailed Description

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

The embodiment of the application discloses lifting device for water sluicegate installation, as shown in fig. 1 and 2, including support column 1, support column 1 is two, and the bottom side of every support column 1 all rotates and is connected with two gyro wheels 11, and the below of gyro wheel 11 is provided with slide rail 12 that is used for supplying gyro wheel 11 to remove. Two sets of braking devices 2 are installed on each supporting column 1, and the four sets of braking devices 2 are arranged corresponding to the four rollers 11.

As shown in fig. 1 and 2, the braking device 2 includes a brake box 21, a brake block 22, a brake motor 23, a lead screw 24, a friction block 25, and a fixing mechanism 26, the brake box 21 is a rectangular block structure, the interior of the brake box 21 is hollow, the bottom side of the brake box 21 is provided with an opening, and the brake box 21 is fixedly connected to one side of the support column 1. The brake block 22 is a rectangular block structure, the brake block 22 is slidably connected to the inner side wall of the brake box 21, an opening of the mounting groove 221 is formed in the bottom side of the brake block 22, and the mounting groove 221 extends along the length direction of the brake block 22. The brake motor 23 is installed at the top side of the brake box 21, and an output shaft of the brake motor 23 is rotatably connected to a top side wall of the brake box 21. The lead screw 24 is rotatably connected to the top side wall of the brake box 21, the end of the lead screw 24 is fixedly connected to the end of the output shaft of the brake motor 23, and the lead screw 24 is threadedly connected to the brake block 22. The friction block 25 is inserted into the mounting groove 221, and the bottom side of the friction block 25 abuts against the slide rail 12. When the roller 11 needs to be prevented from moving on the sliding rail 12, the output shaft of the brake motor 23 drives the screw rod 24 to rotate, the screw rod 24 rotates to drive the brake block 22 to vertically move downwards, the brake block 22 vertically moves downwards to drive the friction block 25 to vertically move downwards until the friction block 25 is tightly abutted to the sliding rail 12, and therefore the purpose of preventing the roller 11 from moving on the sliding rail 12 is achieved.

As shown in fig. 2 and 3, a first through hole 222 with a rectangular opening is formed in a side wall of the mounting groove 221 away from the roller 11, a first sliding groove 223 with a rectangular opening is formed in a side wall of the mounting groove 221 close to the roller 11, and the first sliding groove 223 is aligned with the first through hole 222. The friction block 25 is provided with a third through hole 251 with a rectangular opening, the third through hole 251 extends along the length direction of the friction block 25, and the third through hole 251 is aligned with the first through hole 222. The fixing mechanism 26 includes a fixing rod 261, a limiting block 262 and a pushing assembly 263, the fixing rod 261 is a rectangular rod-shaped structure, a second inclined surface 2612 is disposed on one side of the fixing block close to the braking box 21, the fixing rod 261 passes through the first through hole 222 and the third through hole 251 and then is inserted into the first sliding groove 223, a limiting groove 2611 with a rectangular opening is disposed on the fixing rod 261, a first inclined surface 2621 is disposed on a bottom side of the limiting block 262, and the first inclined surface 2621 of the fixing rod 261 is matched with the second inclined surface 2612 of the limiting block 262. The first sliding groove 223 is provided with a second through hole 224 for the limiting block 262 to slide, and the limiting block 262 is inserted into the limiting groove 2611.

When the friction block 25 needs to be installed on the brake block 22, the friction block 25 is firstly inserted into the installation groove 221 by moving the friction block 25, and then the fixed rod 261 is moved to enable the fixed rod 261 to sequentially penetrate through the first through hole 222 and the third through hole 251 and then to be inserted into and matched with the first sliding groove 223; in the process that the fixing rod 261 is inserted into the first sliding groove 223, the first inclined surface 2621 contacts with the second inclined surface 2612, and under the interaction of the first inclined surface 2621 and the second inclined surface 2612, the fixing rod 261 pushes the limiting block 262 to slide into the second through hole 224, so that the fixing rod 261 is inserted into the first sliding groove 223, and then the limiting block 262 is pushed by the pushing assembly 263 to be inserted into the limiting groove 2611, thereby achieving the purpose of fixing the fixing rod 261 and further achieving the purpose of fixing the friction block 25.

As shown in fig. 2 and 3, the brake pad 22 is provided with a second sliding groove 225 having a rectangular opening, the second sliding groove 225 extends along the length direction of the friction pad 25, two ends of the second through hole 224 are respectively communicated with the first sliding groove 223 and the second sliding groove 225, and a top side wall of the second sliding groove 225 is provided with a guide groove 226 having a circular opening. The pushing assembly 263 includes a pushing block 2631, a first spring 2632 and a guiding rod 2633, wherein the pushing block 2631 is a rectangular block-shaped structure, the pushing block 2631 is slidably connected to the second sliding groove 225 along the vertical direction, the guiding rod 2633 is a circular rod-shaped structure, the guiding rod 2633 is slidably connected to the guiding groove 226, and one end of the guiding rod 2633 is fixedly connected to the upper surface of the pushing block 2631. The first spring 2632 is disposed on the guide rod 2633, and one end of the first spring 2632 is fixedly connected to the upper surface of the push block 2631 and the other end is fixedly connected to the top side wall of the second sliding groove 225. When the limit block 262 needs to be moved vertically upward, the push block 2631 is moved vertically upward to drive the limit block 262 and the guide rod 2633 to move vertically upward by moving the push block 2631; when the external force is no longer applied to the push block 2631, the first spring 2632 pushes the push block 2631 to move, and the push block 2631 moves to drive the stop block 262 to move, so that the purpose of conveniently moving the stop block 262 is achieved; the provision of the guide rod 2633 facilitates guiding of the push block 2631, and reduces the possibility of the first spring 2632 being biased in the other direction when compressed.

As shown in fig. 2 and 3, an elastic component 3 is mounted on an end of the first sliding groove 223 away from the friction block 25, the elastic component 3 includes a baffle 31 and a second spring 32, the baffle 31 is in a rectangular plate-shaped structure, the baffle 31 is slidably connected to the first sliding groove 223, and the baffle 31 abuts against the fixing rod 261. The second spring 32 is located in the first sliding groove 223, one end of the second spring 32 is fixedly connected to the inner side wall of the first sliding groove 223 far away from the fixing rod 261, and the other end of the second spring is fixedly connected to one side of the baffle 31 far away from the fixing rod 261. In order to facilitate the detachment of the friction block 25, the limiting block 262 is detached from the limiting groove 2611 firstly, then under the elastic action of the second spring 32, the second spring 32 pushes the baffle 31 to move, the baffle 31 moves to push the fixed rod 261 to move, so that one end of the fixed rod 261 far away from the baffle 31 protrudes out of the first through hole 222, meanwhile, the position of the limiting groove 2611 is far away from the limiting block 262, the possibility that the limiting block 262 is inserted into the limiting groove 2611 is reduced, thereby achieving the purpose of facilitating the detachment of the fixed rod 261, and further achieving the purpose of facilitating the detachment of the friction block 25.

As shown in fig. 1 and 4, two top fixedly connected with crossbeams 14 of two support columns 1, two hoists 13 for extracting heavy objects are installed above the crossbeams 14, a protective cover 4 is sleeved outside the hoists 13, the top side of the protective cover 4 is provided with an opening, the top side of the protective cover 4 is connected with a top plate 41 through four bolts 42, the top plate 41 is in a rectangular plate-shaped structure, a fourth through hole 43 with a rectangular opening is formed in the side wall of the protective cover 4, and the pull rope of the hoists 13 is communicated with the outside through the fourth through hole 43. The protective cover 4 is arranged, so that the protection effect on the winch 13 is facilitated; the top plate 41 and the protective cover 4 are connected by bolts 42, so that the top plate 41 can be conveniently detached for maintaining the winch 13.

As shown in fig. 1 and 4, the upper and lower sidewalls of the fourth through hole 43 are provided with first rolling members 44, the first rolling members 44 are rolling rods, two ends of the rolling rods are rotatably connected to the left and right sidewalls of the fourth through hole 43 through bearings, the left and right sidewalls of the fourth through hole 43 are provided with second rolling members 45, the second rolling members 45 are balls, and the balls are embedded in the sidewalls of the fourth through hole 43. By providing the first rolling member 44 and the second rolling member 45, the frictional force of the rope of the hoist 13 against the side wall of the fourth through hole 43 can be reduced, and the service life of the rope of the hoist 13 can be prolonged. Through the arrangement of the rolling rod and the rolling balls, sliding friction force is changed into rolling friction force, and therefore the purpose of reducing friction force is achieved.

The implementation principle of the hoisting equipment for installing the water conservancy gate in the embodiment of the application is as follows: when the roller 11 needs to be prevented from moving on the sliding rail 12, the brake motor 23 is started to drive the screw rod 24 to rotate, the screw rod 24 rotates to drive the brake block 22 to vertically move downwards, the brake block 22 vertically moves downwards to drive the friction block 25 to vertically move downwards until the friction block 25 is tightly abutted to the sliding rail 12, and therefore the purpose of preventing the roller 11 from moving on the sliding rail 12 is achieved.

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

Claims

1. The utility model provides a lifting device is used in water sluicegate installation, includes support column (1), gyro wheel (11), slide rail (12) and hoist engine (13), its characterized in that: the braking device (2) is mounted on the supporting column (1), the braking device (2) comprises a braking box (21), a braking block (22), a braking motor (23), a screw rod (24) and a friction block (25), the braking box (21) is fixedly connected to the side wall of the supporting column (1), the interior of the braking box (21) is hollow, and the bottom side of the braking box (21) is provided with an opening; the brake block (22) is connected to the inner side wall of the brake box (21) in a sliding mode, an installation groove (221) is formed in the bottom side of the brake block (22), the brake motor (23) is installed on the top side of the brake box (21), the lead screw (24) is connected to the brake block (22) in a threaded mode, the lead screw (24) is connected to the side wall of the top side of the brake box (21) in a rotating mode, one end of the lead screw (24) is fixedly connected to the end portion of an output shaft of the brake motor (23), the friction block (25) is inserted into the installation groove (221), and the friction block (25) can abut against the side wall; the braking device (2) further comprises a fixing mechanism (26) for fixing the friction block (25).

2. The hoisting equipment is used in water sluicegate installation according to claim 1, characterized in that: a first through hole (222) and a first sliding groove (223) are respectively formed in two opposite inner side walls of the mounting groove (221), the first through hole (222) and the first sliding groove (223) are correspondingly arranged, a second through hole (224) is formed in the inner side of the first sliding groove (223), a third through hole (251) is formed in the friction block (25), the third through hole (251) is arranged corresponding to the first through hole (222), the fixing mechanism (26) comprises a fixing rod (261) and a limiting block (262), the fixing rod (261) sequentially penetrates through the first through hole (222) and the third through hole (251) and then is in inserting fit with the first sliding groove (223), a limiting groove (2611) is formed in the fixing rod (261), the limiting block (262) is slidably connected to the second through hole (224), and the limiting block (262) is inserted in the limiting groove (2611); the fixing mechanism (26) further comprises a pushing component (263) used for pushing the limiting block (262).

3. The hoisting equipment is used in water sluicegate installation according to claim 2, characterized in that: a second sliding groove (225) is arranged on the side wall of the brake block (22), a guide groove (226) is arranged on the inner side wall of the second sliding groove (225), two ends of the second through hole (224) are respectively communicated with the first sliding groove (223) and the second sliding groove (225), the pushing assembly (263) comprises a pushing block (2631), a first spring (2632) and a guide rod (2633), the push block (2631) is slidably connected to the second sliding groove (225), the limit block (262) is fixedly connected to the bottom side of the push block (2631), the guide rod (2633) is slidably connected to the guide groove (226), one end of the guide rod (2633) is fixedly connected to one side of the push block (2631), the first spring (2632) is sleeved on the guide rod (2633), one end of the first spring (2632) is fixedly connected to one side of the push block (2631), and the other end of the first spring is fixedly connected to the side wall of the second sliding groove (225).

4. The hoisting equipment is used in water sluicegate installation according to claim 3, characterized in that: elastic component (3) are installed to the one end of first spout (223), elastic component (3) are including baffle (31) and second spring (32), baffle (31) sliding connection is in first spout (223), the one end fixed connection of second spring (32) is in baffle (31), the tank bottom of other end fixed connection in first spout (223).

5. The lifting device for water sluicegate installation according to claim 4, characterized in that: one side that stopper (262) are close to clutch blocks (25) is equipped with first inclined plane (2621), one side that dead lever (261) are close to baffle (31) is equipped with second inclined plane (2612), first inclined plane (2621) and second inclined plane (2612) cooperate.

6. The hoisting equipment is used in water sluicegate installation according to claim 1, characterized in that: the outer side of the winch (13) is fixedly connected with a protective cover (4), a top plate (41) is arranged on the top side of the protective cover (4), and the top plate (41) is connected with the protective cover (4) through a bolt (42); and a fourth through hole (43) is formed in the side wall of the protective cover (4), and a pull rope of the winch (13) is communicated with the outside through the fourth through hole (43).

7. The lifting device for installing the water sluicegate according to claim 6, wherein: and a first rolling part (44) and a second rolling part (45) are arranged on the inner side wall of the fourth through hole (43).

8. The hoisting equipment is used in water sluicegate installation according to claim 7, characterized in that: first rolling member (44) are including the roll rod, and the both ends of roll rod are all rotated and are connected in two relative lateral walls of fourth through-hole (43), second rolling member (45) are including the ball, and the ball activity inlays the lateral wall of locating fourth through-hole (43).