CN214523745U

CN214523745U - Semitrailer capable of achieving transverse stable transportation

Info

Publication number: CN214523745U
Application number: CN202120971941.5U
Authority: CN
Inventors: 刘成磊
Original assignee: Shandong Yuncheng Juntong Special Vehicle Co Ltd
Current assignee: Shandong Yuncheng Juntong Special Vehicle Co Ltd
Priority date: 2021-05-08
Filing date: 2021-05-08
Publication date: 2021-10-29
Anticipated expiration: 2031-05-08

Abstract

The utility model discloses a semitrailer of lateral stability transportation, including locomotive, carriage, lateral shifting mechanism includes that mount pad, inserted block, telescopic machanism, first articulated seat, pendulum rod, mounting panel, mounting bracket, sideslip roller, and the articulated seat of second is installed along telescopic machanism's axis symmetry in the lateral wall bottom of the flexible end of telescopic machanism, and the middle part of pendulum rod has the third hinge seat towards a side fixed mounting of telescopic machanism, lies in the articulated seat of second with one side of telescopic machanism and all is connected through the connecting rod with the third hinge seat. The utility model discloses when the sideslip roller that drives the mounting panel bottom when the pendulum rod wobbling and ground contact, continue to remove alright leave with wheel and the ground that realizes the carriage, and sideslip roller alright realize lateral shifting in order to drive the carriage this moment, and the push pedal will do all can the power transmission for the roof through the tight spring in top, realizes the inserted block for the location of slot, guarantees the stability of telescopic machanism for the mount pad, stability when having guaranteed lateral shifting.

Description

Semitrailer capable of achieving transverse stable transportation

Technical Field

The utility model belongs to the technical field of the semitrailer, concretely relates to semitrailer of horizontal stable transportation.

Background

A semitrailer is a trailer whose axle is positioned behind the center of gravity of the vehicle (when the vehicle is evenly loaded) and which is equipped with a coupling device that transmits horizontal and vertical forces to the tractor. Semitrailers are generally three-axle semitrailers, and the types of semitrailers are divided into eleven-meter-bin-column semitrailers, thirteen-meter-bin semitrailers, low-bed semitrailers and the like. Is a heavy transport vehicle connected with a semitrailer head through a towing pin.

When the position of an existing semitrailer is changed, a large space is often needed, the accuracy of a position parking position can be achieved only by turning the semitrailer back and forth when the space is insufficient, inconvenience is caused when the position of the semitrailer is changed due to the fact that a carriage of the semitrailer is large, and a good solution is not provided in the prior art for the problem.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a semitrailer of horizontal stable transportation to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: a semitrailer for transverse stable transportation comprises a vehicle head and a carriage, wherein a transverse moving mechanism is fixedly installed at the center of the bottom of the carriage, the transverse moving mechanism comprises a mounting seat, the top end of the mounting seat is installed at the center of the bottom of the carriage, an insertion groove is formed in the center of the bottom of the mounting seat, an insertion block is inserted in the insertion groove, a telescopic mechanism is fixedly installed in the center of the bottom of the insertion block in an embedded mode, first hinged seats are symmetrically installed on the side wall, opposite to the side wall of the bottom of a fixed part of the insertion block, of the telescopic mechanism along the central axis of the telescopic mechanism, swing rods are installed on the first hinged seats, a mounting plate is fixedly installed at the end part, far away from the first hinged seats, of the swing rods and arranged along the length direction of the carriage, mounting frames are symmetrically installed at the end parts of two ends of one end face, far away from the swing rods, of the mounting plate, a transverse moving roller is rotatably installed between the two mounting frames on the same mounting frame, and a second hinged seat is symmetrically installed at the bottom part, far away from the side wall of the telescopic end of the telescopic mechanism, along the central axis of the telescopic mechanism, and a third hinge seat is fixedly arranged in the middle of the swing rod towards one side surface of the telescopic mechanism, and the second hinge seat and the third hinge seat which are positioned on the same side of the telescopic mechanism are connected through a connecting rod.

Preferably, the lateral wall of the insert block is provided with a sliding groove, the sliding groove is arranged along the length direction of the insert block, and the end part of the bottom end of the sliding groove is communicated with the arc-shaped groove.

Preferably, the adjustment tank has been seted up to the top tip of mount pad, and the through-hole has been seted up to the bottom avris of adjustment tank, and the bottom tip and the blind hole of through-hole are linked together, run through in the through-hole and be equipped with the ejector pin, and in the blind hole was located to the bottom tip of ejector pin, and the bottom tip fixed mounting of ejector pin has a kicking block, and the top setting of the bottom of kicking block tightly supports the ejector pad, the top of kicking block is provided with the inclined plane, and the bottom of ejector pad also is equipped with the inclined plane, and the inclined plane at the top of kicking block cooperatees with the inclined plane of ejector pad bottom.

Preferably, the guide block is all installed with the bottom tip of push pedal to the roof, and the guiding hole has been seted up at the center of guide block, and the inside bottom of blind hole still is equipped with the guide bar, and the guide bar passes the guiding hole setting, and the one end tip that the guide bar deepened the blind hole inside passes through fixing base fixed mounting in the blind hole, the guide slot has been seted up with the top tip of push pedal to the roof, and the inside top fixed mounting of blind hole has the guide rail, and the guide rail sets up along the length direction of blind hole, guide slot and guide rail sliding connection.

Preferably, the inside diaphragm that is equipped with of adjustment tank, the top end fixed mounting of ejector pin on the diaphragm, the middle part fixed mounting of diaphragm has the swivel nut, and the inside lead screw that runs through of swivel nut installs, and the bottom end of lead screw rotates through the bearing frame and installs on the diapire of adjustment tank, and the adjustment handle is still installed to the top end of lead screw.

Preferably, telescopic machanism includes fixed sleeve, fixed sleeve's inside bottom is inserted and is equipped with the inserted bar, the inside threaded hole that offers in top of inserted bar, the screw hole sets up along the length direction of inserted bar, still be equipped with the threaded rod in the fixed sleeve, the threaded hole is located to the bottom of threaded rod, the axis of threaded rod and fixed sleeve's axis collineation setting, the shrouding is installed to fixed sleeve's top tip, the reduction gear is installed at the top of shrouding, the top of reduction gear is connected with driving motor, driving motor is connected with reduction gear drive, the bottom of reduction gear is connected with the drive shaft, the drive shaft is driven by the reduction gear, the bottom tip of drive shaft passes the shrouding setting, the bottom tip of drive shaft passes through the top tip hub connection of shaft coupling and threaded rod.

Preferably, the drive shaft is connected with the shrouding through connecting bearing and rotation, the guide way has been seted up to fixed telescopic inside wall bottom, and two have been seted up to the guide way, and two guide ways set up along fixed telescopic axis symmetry, and the guide way parallels with the threaded rod, and the slider is installed along central symmetry on the outer wall top of inserted bar, and the slider is kept away from in the one end tip of inserted bar lateral wall slides and locates the guide way, the dog is installed to the bottom tip of guide way.

Compared with the prior art, the beneficial effects of the utility model are that: the utility model has the advantages of simple and reasonable structure, it is swift convenient to use, telescopic machanism can change the height position of third articulated seat, when third articulated seat removes, third articulated seat can drive the articulated seat of second through the connecting rod and remove, and the articulated seat of second is installed again on the pendulum rod, therefore the pendulum rod just can swing round first articulated seat, when the sideslip roller that drives the mounting panel bottom when the pendulum rod wobbling contacts with ground, continue to remove alright leave with wheel and the ground that realizes the carriage, and the sideslip roller alright realize lateral shifting in driving the carriage this moment, the push pedal passes through the tight spring in top and gives the roof with power transmission, then it tightly supports the effect in the arc recess to play the kicking ball, realize the location of inserted block for the slot, guarantee telescopic machanism for the stability of mount pad, stability when having guaranteed lateral shifting.

Drawings

Fig. 1 is a schematic structural view of a semitrailer for transverse stable transportation according to the present invention;

fig. 2 is a schematic structural view of a lateral moving mechanism in a semitrailer for lateral stable transportation according to the present invention;

FIG. 3 is a schematic structural view of a transverse moving roller in a semitrailer for transverse stable transportation according to the present invention;

FIG. 4 is an enlarged view of the structure at A in FIG. 2;

fig. 5 is a schematic view of a three-dimensional structure of a telescopic rod in a semitrailer for transverse stable transportation according to the present invention;

fig. 6 is a schematic structural view of a telescopic mechanism in a semitrailer for transverse stable transportation according to the present invention;

in the figure: 1. a headstock; 2. a carriage; 3. a lateral movement mechanism; 4. a mounting seat; 5. a slot; 6. inserting a block; 7. a telescoping mechanism; 8. a first hinge mount; 9. a swing rod; 10. mounting a plate; 11. a mounting frame; 12. a traversing roller; 13. a second hinge mount; 14. a third hinge mount; 15. a connecting rod; 16. blind holes; 17. a telescopic rod; 18. a top plate; 19. ejecting the ball; 20. an arc-shaped groove; 21. a chute; 22. pushing the plate; 23. the spring is tightly propped; 24. connecting columns; 25. a push block; 26. an adjustment groove; 27. a through hole; 28. a top rod; 29. a top block; 30. a guide block; 31. a guide hole; 32. a guide bar; 33. a fixed seat; 34. a guide rail; 35. a guide groove; 36. a transverse plate; 37. a threaded sleeve; 38. a screw rod; 39. a bearing seat; 40. an adjusting handle; 41. fixing the sleeve; 42. inserting a rod; 43. a threaded hole; 44. a threaded rod; 45. closing the plate; 46. a speed reducer; 47. a drive motor; 48. a drive shaft; 49. connecting a bearing; 50. a coupling; 51. a guide groove; 52. a slider; 53. and a stop block.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

Referring to fig. 1-6, the present invention provides the following technical solutions: a semitrailer for transverse stable transportation comprises a vehicle head 1 and a carriage 2, wherein a transverse moving mechanism 3 is fixedly installed at the center of the bottom of the carriage 2, the transverse moving mechanism 3 comprises an installation seat 4, the top end of the installation seat 4 is installed at the center of the bottom of the carriage 2, a slot 5 is formed in the center of the bottom of the installation seat 4, an insertion block 6 is inserted into the slot 5, a telescopic mechanism 7 is fixedly installed at the center of the inner bottom of the insertion block 6 in an embedded manner, first hinge seats 8 are symmetrically installed on the side wall of the bottom end of the fixed part of the telescopic mechanism 7 relative to the insertion block 6 along the central axis of the telescopic mechanism 7, swing rods 9 are installed on the first hinge seats 8, an installation plate 10 is fixedly installed at the end part of one end part of each swing rod 9, which is far away from the first hinge seat 8, the installation plate 10 is arranged along the length direction of the carriage 2, and installation frames 11 are symmetrically installed at the end parts of the installation plate 10, which are far away from the end part of one end surface of each swing rod 9, the transverse moving roller 12 is rotatably installed between two installation frames 11 on the same installation plate 10, a second hinge seat 13 is symmetrically installed at the bottom of the side wall of the telescopic end of the telescopic mechanism 7 along the central axis of the telescopic mechanism 7, a third hinge seat 14 is fixedly installed in the middle of the swing rod 9 towards one side face of the telescopic mechanism 7, and the second hinge seat 13 and the third hinge seat 14 which are located on the same side of the telescopic mechanism 7 are connected through a connecting rod 15. The telescopic mechanism 7 can change the height position of the third hinged seat 14, when the third hinged seat 14 moves, the third hinged seat 14 can drive the second hinged seat 13 to move through the connecting rod 15, and the second hinged seat 13 is installed on the swing rod 9, so that the swing rod 9 can swing around the first hinged seat 8, when the swing rod 9 swings and simultaneously drives the cross sliding roller 12 at the bottom of the installation plate 10 to contact with the ground, the cross sliding roller 12 can continuously move to enable the wheels of the carriage 2 to leave from the ground, and at the moment, the cross sliding roller 12 can drive the carriage 2 to move transversely.

Specifically, a blind hole 16 is formed in the inner side wall of the slot 5, a telescopic rod 17 is arranged in the blind hole 16, a top plate 18 is fixedly mounted at one end of the telescopic rod 17 facing the insert 6, a top ball 19 is fixedly mounted at the center of one end face of the top plate 18 far away from the telescopic rod 17, an arc-shaped groove 20 is formed in the side wall of the insert 6, a side wall of the top ball 19 far away from the top plate 18 is tightly abutted to the arc-shaped groove 20, a push plate 22 is fixedly mounted at one end of the telescopic rod 17 far away from the top plate 18, a jacking spring 23 is arranged between the push plate 22 and the top plate 18, the jacking spring 23 is sleeved outside the telescopic rod 17, a connecting column 24 is fixedly mounted at the center of one end of the push plate 22 far away from the telescopic rod 17, a push block 25 is mounted at one end of the connecting column 24 far away from the push plate 22, force is applied to the push block 25 through the push block 24, and is transmitted to the push plate 22 through the jacking spring 23, which in turn has the effect that the jacking balls 19 are tightened against the inside of the arc-shaped grooves 20.

Specifically, a sliding groove 21 is formed in the side wall of the inserting block 6, the sliding groove 21 is formed in the length direction of the inserting block 6, and the end portion of the bottom end of the sliding groove 21 is communicated with the arc-shaped groove 20.

Specifically, adjustment tank 26 has been seted up to the top end of mount pad 4, and through-hole 27 has been seted up to the bottom avris of adjustment tank 26, and the bottom tip and the blind hole 16 of through-hole 27 are linked together, run through being equipped with ejector pin 28 in the through-hole 27, and in blind hole 16 was located to the bottom tip of ejector pin 28, and the bottom tip fixed mounting of ejector pin 28 has ejector pad 29, and the top setting that pushes up block 25 is tightly supported to the bottom of ejector pad 29, the top of ejector pad 29 is provided with the inclined plane, and the bottom of ejector pad 25 also is equipped with the inclined plane, and the inclined plane at the top of ejector pad 29 cooperatees with the inclined plane of ejector pad 25 bottom. By applying a force to the plunger 28 from the adjustment groove 26, the plunger 28 in turn exerts a force on the push block 25 via the push block 29.

Specifically, guide block 30 is all installed with push pedal 22's bottom tip to roof 18, and guiding hole 31 has been seted up at the center of guide block 30, and the inside bottom of blind hole 16 still is equipped with guide bar 32, and guide bar 32 passes the guiding hole 31 setting, and the one end tip that guide bar 32 deepened inside blind hole 16 passes through fixing base 33 fixed mounting in blind hole 16, guide slot 35 has been seted up with push pedal 22's top tip to roof 18, and the inside top fixed mounting of blind hole 16 has guide rail 34, and guide rail 34 sets up along blind hole 16's length direction, guide slot 35 and guide rail 34 sliding connection.

Specifically, the inside diaphragm 36 that is equipped with of adjustment tank 26, the top end fixed mounting of ejector pin 28 is on diaphragm 36, the middle part fixed mounting of diaphragm 36 has swivel nut 37, the inside lead screw 38 that runs through of swivel nut 37 installs, the bottom end of lead screw 38 is installed on the diapire of adjustment tank 26 through the rotation of bearing frame 39, adjustment handle 40 is still installed to the top end of lead screw 38, rotate adjustment handle 40, can drive lead screw 38 rotatory, lead screw 38 can drive diaphragm 36 through swivel nut 37 and go up and down in adjustment tank 26, when diaphragm 36 goes up and down, alright change height and give the ejector pin 28 application of force in order to drive ejector pin 28, finally, play the effect of adjusting push pedal 22.

Rotate the regulation handle 40, the regulation handle 40 can drive the lead screw 38 rotatory, the lead screw 38 can drive diaphragm 36 through swivel nut 37 and go up and down in adjustment tank 26, when diaphragm 36 goes up and down, alright in order to drive ejector pin 28 notion height, give ejector pin 28 application of force, ejector pin 28 passes through kicking block 29 again and acts on ejector pad 25 with power, ejector pad 25 passes through spliced pole 24 again with power and transmits for push pedal 22, push pedal 22 passes through top tension spring 23 and gives roof 18 with power transmission, then play the effect that kicking ball 19 tightly supported in arc recess 20, realize the location of inserted block 6 for slot 5, guarantee telescopic machanism 7 for the stability of mount pad 4, stability when having guaranteed lateral shifting.

Specifically, telescopic machanism 7 includes fixed sleeve 41, fixed sleeve 41's inside bottom is inserted and is equipped with inserted bar 42, the inside screw hole 43 of seting up in inserted bar 42's top, screw hole 43 sets up along inserted bar 42's length direction, still be equipped with threaded rod 44 in the fixed sleeve 41, the bottom of threaded rod 44 is located in screw hole 43, the axis of threaded rod 44 and fixed sleeve 41's the axis collineation setting, shrouding 45 is installed to fixed sleeve 41's top end, reduction gear 46 is installed at shrouding 45's top, reduction gear 46's top is connected with driving motor 47, driving motor 47 is connected with reduction gear 46 transmission, reduction gear 46's bottom is connected with drive shaft 48, drive shaft 48 is driven by reduction gear 46, the bottom tip of drive shaft 48 passes shrouding 45 and sets up, the bottom tip of drive shaft 48 passes through shaft coupling 50 and threaded rod 44's top end hub connection.

Specifically, the driving shaft 48 is rotatably connected with the sealing plate 45 through a connecting bearing 49, two guide grooves 51 are formed in the bottom of the inner side wall of the fixing sleeve 41, the two guide grooves 51 are symmetrically arranged along the central axis of the fixing sleeve 41, the guide grooves 51 are parallel to the threaded rod 44, the sliding blocks 52 are symmetrically installed on the top end of the outer wall of the insertion rod 42 along the center, one end portion, far away from the side wall of the insertion rod 42, of each sliding block 52 is slidably arranged in the guide grooves 51, the sliding blocks 52 are matched with the guide grooves 51, stable extension and retraction of the insertion rod 42 at the bottom of the fixing sleeve 41 can be guaranteed, and the stop blocks 53 are installed at the end portion of the bottom end of the guide grooves 51.

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

1. The utility model provides a semitrailer of lateral stability transportation, includes locomotive (1) and carriage (2), its characterized in that: the bottom center of the carriage (2) is fixedly provided with a transverse moving mechanism (3), the transverse moving mechanism (3) comprises a mounting seat (4), the top end of the mounting seat (4) is installed on the bottom center of the carriage (2), a slot (5) is formed in the bottom center of the mounting seat (4), an insert block (6) is inserted into the slot (5), a telescopic mechanism (7) is fixedly installed in the bottom center of the insert block (6) in an embedded mode, a first hinged seat (8) is symmetrically installed on the bottom side wall of the fixed portion of the telescopic mechanism (7) relative to the insert block (6) along the central axis of the telescopic mechanism (7), a swing rod (9) is installed on the first hinged seat (8), one end portion, far away from the first hinged seat (8), of the swing rod (9) is fixedly provided with a mounting plate (10), the mounting plate (10) is arranged along the length direction of the carriage (2), the mounting plate (10) is symmetrically installed on the end portions of two ends, far away from one end face of the swing rod (9), of the mounting plate (10), of the mounting plate (11), rotate between two mounting brackets (11) on same mounting panel (10) and install sideslip roller (12), the articulated seat of second (13) is installed along the axis symmetry of telescopic machanism (7) to the lateral wall bottom of telescopic machanism (7) flexible end, and the middle part of pendulum rod (9) has third articulated seat (14) towards a side fixed mounting of telescopic machanism (7), and articulated seat of second (13) that lie in telescopic machanism (7) with one side all is connected through connecting rod (15) with third articulated seat (14).

2. A semitrailer for laterally stable transport according to claim 1, characterised in that: the inner side wall of the slot (5) is provided with a blind hole (16), a telescopic rod (17) is arranged in the blind hole (16), the end part of one end, facing the insert block (6), of the telescopic rod (17) is fixedly provided with a top plate (18), the center of one end face, away from the telescopic rod (17), of the top plate (18) is fixedly provided with a top ball (19), the side wall of the insert block (6) is provided with an arc-shaped groove (20), one side wall, away from the top plate (18), of the top ball (19) is tightly propped in the arc-shaped groove (20), the one end tip fixed mounting that roof (18) were kept away from in telescopic link (17) has push pedal (22), is equipped with between push pedal (22) and roof (18) and pushes up tight spring (23), pushes up the outside of tight spring (23) cover establish with telescopic link (17), and the one end center fixed mounting that telescopic link (17) were kept away from in push pedal (22) has spliced pole (24), and push block (25) are installed to the one end that push pedal (22) were kept away from in spliced pole (24).

3. A semitrailer for laterally stable transport according to claim 2, characterised in that: seted up spout (21) on the lateral wall of inserted block (6), spout (21) set up along inserted block (6) length direction, and the bottom tip of spout (21) communicates arc recess (20) and sets up.

4. A semitrailer for laterally stable transport according to claim 3, characterised in that: adjustment tank (26) have been seted up to the top end of mount pad (4), through-hole (27) have been seted up to the bottom avris of adjustment tank (26), and the bottom end of through-hole (27) is linked together with blind hole (16), runs through in through-hole (27) and is equipped with ejector pin (28), and in blind hole (16) was located to the bottom end of ejector pin (28), and the bottom end fixed mounting of ejector pin (28) has kicking block (29), and the top setting that tightly supports kicking block (25) in the bottom of kicking block (29), the top of kicking block (29) is provided with the inclined plane, and the bottom of kicking block (25) also is equipped with the inclined plane, and the inclined plane at the top of kicking block (29) cooperatees with the inclined plane of kicking block (25) bottom.

5. A semitrailer for laterally stable transport according to claim 4, characterised in that: guide block (30) are all installed with the bottom tip of push pedal (22) in roof (18), and guiding hole (31) have been seted up at the center of guide block (30), and the inside bottom of blind hole (16) still is equipped with guide bar (32), and guide bar (32) pass guide hole (31) and set up, and fixing base (33) fixed mounting is passed through in blind hole (16) the inside one end tip of guide bar (32) deep into blind hole (16), guide slot (35) have been seted up with the top tip of push pedal (22) in roof (18), and the inside top fixed mounting of blind hole (16) has guide rail (34), and guide rail (34) set up along the length direction of blind hole (16), guide slot (35) and guide rail (34) sliding connection.

6. A semitrailer for laterally stable transport according to claim 5, characterised in that: the adjusting groove (26) is internally provided with a transverse plate (36), the top end part of the ejector rod (28) is fixedly arranged on the transverse plate (36), the middle part of the transverse plate (36) is fixedly provided with a threaded sleeve (37), a screw rod (38) is arranged inside the threaded sleeve (37) in a penetrating mode, the bottom end part of the screw rod (38) is rotatably arranged on the bottom wall of the adjusting groove (26) through a bearing seat (39), and the top end part of the screw rod (38) is further provided with an adjusting handle (40).

7. A semitrailer for laterally stable transportation according to claim 6, characterised in that: the telescopic mechanism (7) comprises a fixing sleeve (41), an inserted bar (42) is inserted into the inner bottom of the fixing sleeve (41), a threaded hole (43) is formed in the top end of the inserted bar (42), the threaded hole (43) is formed in the length direction of the inserted bar (42), a threaded rod (44) is further arranged in the fixing sleeve (41), the bottom of the threaded rod (44) is arranged in the threaded hole (43), the central axis of the threaded rod (44) and the central axis of the fixing sleeve (41) are arranged in a collinear manner, a sealing plate (45) is arranged at the top end of the fixing sleeve (41), a speed reducer (46) is arranged at the top of the sealing plate (45), a driving motor (47) is connected to the top of the speed reducer (46), the driving motor (47) is in transmission connection with the speed reducer (46), a driving shaft (48) is connected to the bottom of the speed reducer (46), and the driving shaft (48) is driven by the speed reducer (46), the bottom end of the driving shaft (48) penetrates through the sealing plate (45), and the bottom end of the driving shaft (48) is connected with the top end of the threaded rod (44) through a shaft coupling (50).

8. A semitrailer for laterally stable transport according to claim 7, characterised in that: drive shaft (48) are connected through connecting bearing (49) and shrouding (45) rotation, guide way (51) have been seted up to the inside wall bottom of fixed sleeve (41), and two have been seted up in guide way (51), and two guide ways (51) are along the axis symmetry setting of fixed sleeve (41), and guide way (51) parallel with threaded rod (44), and slider (52) are installed along central symmetry on the outer wall top of inserted bar (42), and the one end tip that inserted bar (42) lateral wall was kept away from in slider (52) slides and locates guide way (51), dog (53) are installed to the bottom tip of guide way (51).