CN113834605A

CN113834605A - Physical signal air tightness detection device for automobile hub

Info

Publication number: CN113834605A
Application number: CN202111164737.3A
Authority: CN
Inventors: 陈静
Original assignee: Zhejiang Boda Industry And Trade Co ltd
Current assignee: Zhejiang Boda Industry And Trade Co ltd
Priority date: 2021-09-30
Filing date: 2021-09-30
Publication date: 2021-12-24
Anticipated expiration: 2041-09-30
Also published as: CN113834605B

Abstract

The invention provides a physical signal air tightness detection device of an automobile hub, and belongs to the technical field of hub manufacturing equipment. It has solved the current not good problem of automobile wheel hub's gas tightness check out test set form. The air tightness detection device comprises a frame body, a control part fixedly arranged on the frame body and used for controlling the start and stop of other kinetic energy elements, a workbench fixedly arranged above the frame body, a detection platform arranged on the workbench and capable of adjusting the height of small amplitude relative to the workbench, a base detachably fixed on the detection platform and used for placing a wheel hub, and four rolling parts fixedly arranged on the workbench, positioned on two sides of the detection platform and positioned at four corners of a rectangle. Compared with the prior art, the air tightness detection device is more advanced than the prior art, the inner ring of the hub is not easily crushed, the hub can be automatically driven to rotate to switch positions, and the due driving form of each component is simple.

Description

Physical signal air tightness detection device for automobile hub

Technical Field

The invention belongs to the technical field of hub manufacturing equipment, and relates to a physical signal air tightness detection device for an automobile hub.

Background

In the process of machining and forming the automobile hub, in order to improve the safety of the automobile hub after the automobile hub is assembled with a tire, the air tightness detection of the sand holes on the surface of the automobile hub is an indispensable link.

At present, the conventional air tightness detection method is to immerse an object into water and identify whether bubbles exist through naked eyes, so that the detection is finished, the mode is low in efficiency, manual influence factors received by naked eyes are large due to the fact that the bubbles need to be observed through naked eyes, and the drying treatment is needed after the detection is finished, so that the production cost is increased.

In contrast, the applicant has found, through search, an invention patent with patent number CN201210458674.7 and named as a simple hub air-tight machine, and found that the technical solution of the invention patent in the conception and discussion process has many disadvantages, which are mainly reflected in the following two aspects:

firstly, the fixture optimization degree and the automation degree of the scheme are not high, after a wheel hub workpiece is placed on the fixture, people are required to manually start the oil pressure corner oil cylinder, then the pressing block is rotated to the inner side of the wheel hub and pressed on the inner wall of the wheel hub to complete limiting, and the pressing block is in direct contact with the inner wall of the wheel hub and is easily scraped in the process of overturning the wheel hub;

second, wheel hub degree of automation is not high in the form of switching the station, at the in-process that carries out the inspection, still needs the manual wheel hub that overturns of people, guarantees that 360 of wheel hub can both pass through the through-hole to accomplish the gas leakage and detect the function.

Disclosure of Invention

The invention aims to provide a physical signal air tightness detection device for an automobile hub, aiming at the problem that the existing air tightness detection device for the automobile hub is poor in form.

The purpose of the invention can be realized by the following technical scheme:

the utility model provides an automobile wheel hub's physical signal gas tightness detection device, comprising a frame body, the fixed control unit who sets up on the support body and be used for controlling other kinetic energy components to open and stop, the fixed workstation that sets up in the support body top, the setting can carry out the detection platform of small amplitude altitude mixture control for the workstation on the workstation, can dismantle and fix on detecting the bench and be used for placing wheel hub's base, the fixed setting is on the workstation and be in four pressure roll parts that detect the platform both sides and be located four angular positions of rectangle, the top of base is equipped with and waits to detect wheel hub outer lane assorted die cavity, the center department of base sets up the gas pocket, it can aerify and make the subassembly of ventilating of upwards discharging of the gas in the gas pocket to detect the bench, its characterized in that: the pressure rolling part comprises a positioning table fixedly arranged on a workbench, a lifting rotating rod which can be lifted and rotatably arranged on the positioning table, a pressure rolling block fixedly arranged above the lifting rotating rod, a main shaft transversely arranged on the pressure rolling block in a rotating mode and with two ends extending to the outer side of the pressure rolling block, a pressure roller fixedly arranged at one end of the main shaft, a first limiting ring body arranged in the main shaft, a first limiting ring groove arranged in the pressure rolling block, the first limiting ring body is located in the first limiting ring groove to enable the main shaft not to transversely break away from the pressure rolling block, the lifting rotating rod realizes up-and-down under the action of a lifting driving assembly and realizes deflection under the action of a deflection driving assembly, and the main shaft realizes rotation under the action of a rotation driving assembly.

In the above device for detecting the air tightness of the physical signal of the automobile hub, the lifting driving assembly comprises a positioning column vertically and fixedly arranged on the frame body and a lifting support plate arranged on the positioning column in a lifting and sliding manner, erect and rotate the setting on the support body and with lift extension board threaded connection's threaded rod, fixed setting is on the support body and is used for driving threaded rod pivoted lift drive component and derailleur subassembly, the fixed four cooperation bodies that are equipped with on the lift extension board, four cooperation bodies are used for respectively with four lift bull stick normal running fit, be equipped with the perforation on the cooperation body, the spacing annular of round second has been seted up to the fenestrate lateral wall, be equipped with the first spacing ring body of round on the lift bull stick, the lift bull stick passes the perforation and is connected with the cooperation body rotation, it is vertical spacing for the cooperation body that the lift bull stick is realized in the spacing annular of second to first spacing ring body, the lift extension board makes the lift bull stick carry out synchronous lifting under the drive of the cooperation body after the removal in the direction of height.

In the above device for detecting the air tightness of the physical signal of the automobile hub, the deflection driving assembly comprises deflection driving members symmetrically arranged on the lifting support plate and deflection gears fixedly arranged at the end part of the bottom end of the lifting rotating rod, the deflection driving element and the transmission component are fixedly arranged below the lifting support plate, the deflection driving component comprises a limiting block which is fixedly arranged on the lifting support plate and is provided with a transverse limiting hole, a bidirectional tooth body which is transversely arranged in a sliding mode is arranged through the transverse limiting hole, racks are arranged on the two transverse sides of the bidirectional tooth body and are respectively connected with a deflection gear on the side in a matched mode, the two bidirectional tooth bodies are respectively connected with a bidirectional screw in a matched mode in a threaded mode, the bidirectional screw is rotatably arranged on the lifting support plate, the bidirectional screw and the two bidirectional tooth bodies are respectively provided with a forward thread and a reverse thread in a threaded matched mode, and the bidirectional screw is in butt joint with an output shaft of the deflection driving element and the transmission component in a belt wheel mode.

In foretell physical signal gas tightness detection device of automobile wheel hub, the rotary driving subassembly including fixed set up on the main shaft dorsad the driven gear who presses gyro wheel one end tip, transversely rotate the setting examine on the test table and both ends wear out to examining the outside drive shaft of test table, fixed two driving gears that set up at the drive shaft both ends, fixed setting is examining in the test table and be used for ordering about drive shaft pivoted rotary driving component and derailleur subassembly, the driving gear is coplanar with two driven gears of homonymy, driven gear can with the driving gear meshing of its below along with pressing the rolling piece decline.

In the above device for detecting the air tightness of the physical signal of the automobile hub, a weight is arranged at the eccentric position on the driven gear, and when the driven gear is not constrained: the weight can drive the driven gear to deflect under the action of gravity until the weight is positioned at the lowest position of the driven gear, so that the automatic positioning and calibration of the driven gear are completed; the automatic positioning calibration device is characterized in that a plurality of magnets are evenly distributed on the circumference of the driving gear, an electromagnet is further arranged at a position, close to the driving gear, of the workbench, a circuit assembly is fixedly arranged on the frame body, the electromagnet is located in the circuit assembly, a circuit breaking interface is arranged on the circuit assembly, a guide rod with electric conduction capability is arranged on the transverse fixing frame of the lifting support plate, two ends of the circuit breaking interface are located at a path where the guide rod lifts along with the lifting support plate, the workbench and the positioning tables around the driving gear and the driving gear are made of nonmagnetic materials, the circuit assembly forms a path in the moment of passing through the circuit breaking interface after the height of the guide rod changes, and the electromagnet generates magnetism to adsorb the magnets, which are closest to the driving gear, so that the automatic positioning calibration of the driving gear is completed.

In foretell physical signal gas tightness detection device of automobile wheel hub, the reference column have two, the threaded rod has four, the bottom of threaded rod is equipped with the fixed sprocket that is equipped with, through chain transmission cooperation between four sprockets, lift drive element and derailleur subassembly are used for driving one of them sprocket rotatory.

Compared with the prior art, the air tightness detection device is more advanced than the prior art, the inner ring of the hub is not easily crushed, the hub can be automatically driven to rotate to switch positions, and the due driving form of each component is simple.

Drawings

Fig. 1 is a schematic structural view of an air-tightness detecting device in a state where a press roller is unfolded;

fig. 2 is a schematic structural view of the airtightness detection apparatus in a state where the press roller is retracted;

FIG. 3 is a schematic structural diagram of the air tightness detecting device after a rolling block is in the process of expansion and contraction and a rolling part is removed;

FIG. 4 is a schematic view of the construction of the lift drive assembly and the yaw drive assembly;

FIG. 5 is a schematic diagram of the structure of the yaw drive assembly;

FIG. 6 is a schematic view of the structural principle of the elevation drive assembly, the deflection drive assembly and the rotation drive assembly from the axial side;

FIG. 7 is a schematic diagram of the front side view angle structure of the elevation drive assembly, the yaw drive assembly, and the rotation drive assembly;

in the figure, 1, a frame body; 2. a control component; 3. a work table; 4. a detection table; 5. a base; 6. air holes; 7. a positioning table; 8. a lifting rotating rod; 9. pressing the rolling block; 10. a main shaft; 11. pressing the roller; 12. a positioning column; 13. a lifting support plate; 14. a threaded rod; 15. a lift drive element and transmission assembly; 16. a mating body; 17. a deflection gear; 18. a yaw drive element and a transmission assembly; 19. a limiting block; 20. a bidirectional tooth body; 21. a bidirectional screw; 22. a driven gear; 23. a drive shaft; 24. a driving gear; 25. a weighting block; 26. a attracting magnet; 27. an electromagnet; 28. an open circuit interface; 29. a guide rod.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in fig. 1 and fig. 2, this automobile wheel hub's physical signal gas tightness detection device includes support body 1, the fixed control unit 2 that sets up on support body 1 and be used for controlling other kinetic energy components to open and stop, the fixed workstation 3 that sets up in support body 1 top, set up on workstation 3 and can carry out the detection platform 4 of small-amplitude altitude mixture control for workstation 3, can dismantle and fix and be used for placing wheel hub's base 5 on detecting platform 4, the fixed four pressure that set up on workstation 3 and be in and detect platform 4 both sides and be located four angular position of rectangle roll the part, the top of base 5 is equipped with and waits to detect wheel hub outer lane assorted die cavity, the center department of base 5 sets up gas pocket 6, it can aerify gas pocket 6 and make the subassembly of ventilating that upwards discharges of gas in the gas pocket 6 to be equipped with in the detection platform 4.

The above technical solutions are similar to the technical solutions (hereinafter referred to as original solutions) mentioned in the background art, and all of them are that a wheel hub is placed on a cavity of a base 5, then gas is introduced through a gas hole 6 to check the tightness of the wheel, and then a great deal of optimization and improvement are made for the solutions:

the press rolling part comprises a positioning table 7 fixedly arranged on the workbench 3, a lifting rotating rod 8 arranged on the positioning table 7 in a lifting and rotating way, a press rolling block 9 fixedly arranged above the lifting rotating rod 8, a main shaft 10 transversely rotatably arranged on the press rolling block 9 and with two ends extending to the outer side of the press rolling block 9, and a press rolling wheel 11 fixedly arranged at one end of the main shaft 10, wherein a first limit ring body is arranged in the main shaft 10, a first limit ring groove is arranged in the press rolling block 9 (in the production and manufacturing process, the press rolling block 9 can be composed of two parts, one part is provided with the first limit ring groove, then after the two parts are butted and fastened, the press rolling block 9 with the first limit ring groove inside is formed, the first limit ring body is positioned in the first limit ring groove, so that the main shaft 10 can not transversely separate from the press rolling block 9, the lifting rotating rod 8 can realize up and down lifting under the action of a lifting driving component and realize deflection under the action of a deflection driving component, the spindle 10 is rotated by a rotary drive assembly.

The working processes of the lifting driving assembly, the deflection driving assembly and the rotation driving assembly are all realized by the control component 2 to work cooperatively, and the specific structure, the operation principle and the improvement effect are as follows:

as shown in fig. 4, the lifting driving assembly includes a positioning post 12 vertically and fixedly disposed on the frame body 1, a lifting support plate 13 vertically and slidably disposed on the positioning post 12, a threaded rod 14 vertically and rotatably disposed on the frame body 1 and in threaded connection with the lifting support plate 13, a lifting driving element and transmission assembly 15 fixedly disposed on the frame body 1 and used for driving the threaded rod 14 to rotate, four matching bodies 16 are fixedly disposed on the lifting support plate 13, the four matching bodies 16 are respectively used for rotatably matching with the four lifting rotating rods 8, a through hole is disposed on the matching body 16, a circle of second limiting ring groove is disposed on a side wall of the through hole (in the manufacturing process, the matching body 16 may be composed of two parts, one of the two parts is provided with the second limiting ring groove, and then after the two parts are butted and fastened, the matching body 16 having the second limiting ring groove therein is formed), a circle of first limiting ring body is disposed on the lifting rotating rod 8, the lifting rotating rod 8 penetrates through the through hole and is connected with the matching body 16 in a rotating mode, the first limiting ring body is located in the second limiting ring groove to achieve vertical limiting of the lifting rotating rod 8 relative to the matching body 16, and the lifting support plate 13 moves in the height direction and then enables the lifting rotating rod 8 to lift synchronously under the driving of the matching body 16.

In this embodiment, the number of the positioning columns 12 is two, the number of the threaded rods 14 is four, the bottom of the threaded rod 14 is provided with a fixed chain wheel, the four chain wheels are in transmission fit through a chain, and the lifting driving element and the transmission assembly 15 are used for driving one of the chain wheels to rotate.

Compared with the original scheme, the optimization scheme adopted herein does not need 4 oil cylinders, but directly drives 4 lifting rotating rods 8 to synchronously lift through the same lifting support plate 13, so that the synchronous rates of the oil cylinders are completely consistent, and the control device does not need to simultaneously control the operation of the 4 oil cylinders, and only needs to control a lifting driving element and a transmission assembly 15, so that the programming is more concise.

As shown in fig. 5, the deflection driving assembly includes a deflection driving member symmetrically disposed on the lifting support plate 13, a deflection gear 17 fixedly disposed at the bottom end of the lifting rotating rod 8, a deflection driving element and a transmission assembly 18 fixedly disposed below the lifting support plate 13, the deflection driving member includes a stopper 19 fixedly disposed on the lifting support plate 13 and having a transverse limiting hole, and a bidirectional gear 20 slidably disposed through the transverse limiting hole, the bidirectional gear 20 has racks disposed on both transverse sides thereof, the racks are respectively coupled with the deflection gear 17 on the side, both the bidirectional gears 20 are coupled with a bidirectional screw 21 in a threaded manner, the bidirectional screw 21 is rotatably disposed on the lifting support plate 13 and cannot move transversely (is limited to rotate relative to the lifting support plate 13), the bidirectional screw 21 and the two bidirectional gears 20 are respectively in a forward threaded manner and a reverse threaded manner, the bi-directional screw 21 is in pulley engagement with the yaw drive element and the output shaft of the variator assembly 18.

Compared with the original scheme, the optimized scheme adopted herein does not need 4 corner oil cylinders, but directly uses two bidirectional tooth bodies 20 driven by the same bidirectional screw 21, and two sides of the bidirectional tooth bodies 20 are provided with racks to deflect the deflection gear 17, and the deflections of the four are also symmetrical.

After the lifting driving assembly and the deflection driving assembly are designed, the hub can be positioned and clamped, in the operation process, the four pressure rollers 9 are lifted to the highest position shown in fig. 2 through the lifting driving assembly, then the deflection driving assembly deflects to the state shown in fig. 1, the base 5 is enabled to have enough space above the base to place the hub (if the hub is not deflected, the hub cannot be placed due to the clamping phenomenon if the hub is not deflected), then the deflection driving assembly deflects to return to the state shown in fig. 2, and then the four pressure rollers 9 are lowered through the lifting driving assembly until the pressure rollers 11 are pressed around the inner ring of the hub, so that the positioning and clamping effects can be completed.

As shown in fig. 1 and 2, the rotary driving assembly includes a driven gear 22 fixedly disposed on the main shaft 10 and facing away from one end of the pressure roller 11, a driving shaft 23 transversely rotatably disposed on the detection table 4 and having two ends penetrating out of the detection table 4, two driving gears 24 fixedly disposed at two ends of the driving shaft 23, a rotary driving element fixedly disposed in the detection table 4 and driving the driving shaft 23 to rotate, and a transmission assembly, wherein the driving gear 24 is coplanar with the two driven gears 22 on the same side, and the driven gear 22 can be meshed with the driving gear 24 below the driven gear as the pressure roller block 9 descends.

This scheme adopts and presses gyro wheel 11 to press behind the wheel hub inner circle, then presses gyro wheel 11 to rotate the back and drive the wheel hub rotation through frictional force, and then realizes wheel hub's rotation transposition process.

If the drive elements are designed on each of the rollers 9 to drive the rotation of the spindles 10, the 4 drive elements not only require higher cost, but also have precise coordination control, otherwise the speed will deviate slightly to cause slippage, and all the applicants consider that it is the best form to use a unified rotary drive element and transmission assembly to synchronously drive the 4 spindles 10 to rotate together.

Here, the function of the workbench 3 for performing small-amplitude height adjustment on the detection table 4 (generally, fine adjustment is performed by using the threaded rod 14, and the technology is not introduced more than the conventional scheme) is very needed, because when the pressure roller block 9 descends to the lowest position, it is required to ensure that the driven gear 22 is just meshed with the driving gear 24, and the hub inner ring is tightly attached to the pressure roller 11, under this height environment, it is required to adjust the height position of the detection table 4 relative to the workbench 3 to ensure that the pressure roller 11 is not just tightly attached to the hub at the same height when the driven gear 22 is meshed with the driving gear 24, and the first time of debugging is completed, so that the detection table can be used for detecting subsequent hubs with the same specification.

As shown in fig. 1 to 3, a weight 25 is provided at an eccentric position on the driven gear 22, and when the driven gear 22 is not constrained: the weight 25 will drive the driven gear 22 to deflect under the action of gravity until the weight 25 is located at the lowest position of the driven gear 22, so as to complete the automatic positioning calibration of the driven gear 22.

As shown in fig. 3, 6 and 7, a plurality of attracting magnets 26 (objects having a property of being attracted by magnetic substances) are uniformly distributed on the circumference of the driving gear 24, an electromagnet 27 is further arranged on the position, close to the driving gear 24, of the workbench 3, a circuit assembly is fixedly arranged on the frame body 1, the electromagnet 27 is arranged in the circuit assembly, the circuit assembly is provided with a breaking interface 28, a guide rod 29 having a conductive capability is transversely fixed on the lifting support plate 13, two ends of the breaking interface 28 are located on a path where the guide rod 29 lifts along with the lifting support plate 13, the driving gear 24, the workbench 3 and the positioning table 7 around the driving gear 24 are made of nonmagnetic materials, the circuit assembly forms a path at the moment when the guide rod 29 passes through the breaking interface 28 after the height change of the guide rod 29, and at this moment, the electromagnet 27 generates magnetism to attract the attracting magnet 26 closest to the two positions, and completing the automatic positioning calibration of the driving gear 24.

Because the driven gear 22 and the driving gear 24 need to be engaged, disengaged, re-engaged and re-disengaged for a plurality of times in the scheme, in order to ensure that the driven gear and the driving gear do not generate the phenomenon of tooth collision in the engaging process, the design ensures that the driven gear and the driving gear can complete the position calibration function after being disengaged, and the driven gear and the driving gear are always in a preset reasonable angle before secondary engagement.

Since the driven gear 22 is fixed on the main shaft 10 and the weight of the driven gear 22 is not large, the applicant has provided the weight 25 at the eccentric position of the driven gear 22, and the weight 25 has the weight when the driven gear 22 is not restrained, so that the applicant can automatically adjust the position of the driven gear 22 until the weight 25 is at the lowest position of the driven gear 22, so that the driven gear 22 only has a state at the last time, and the angle of the driven gear 22 in the state is designed in advance, and then the driven gear 22 is in the position of completing the calibration every time the driven gear 22 is stabilized.

Since the driving gear 24 is fixed on the driving shaft 23, the driving shaft 23 crosses the whole detection table 4, the factors are large, and the weight of the driving shaft 23 is heavy, if the form of the weight 25 is also adopted as the driven gear 22, the weight 25 can cause the driven gear 22 to be overweight during starting, so that the rotary driving element and the transmission assembly need to provide higher power, and the applicant replaces a calibration form after comprehensive consideration, and the method of the electromagnet 27 is adopted.

Every time the lifting support plate 13 is lifted, the guide rod 29 fixedly arranged on the lifting support plate 13 enables the circuit assembly to form a passage at a moment when the lifting support plate 13 passes through the disconnection interface 28, then the electromagnet 27 is electrified to generate magnetism, the guide rod adsorbs the magnet attracting body 26 on the driving gear 24 closest to the driving gear 24 to enable the magnet attracting body 26 to be transversely aligned with the electromagnet 27, the driving gear 24 is a part which is centrosymmetric, so that the magnet attracting bodies 26 are uniformly distributed on the circumference, and then the swinging angle is designed in advance, and the accurate positioning calibration effect can be achieved. Then, when the guide rod 29 passes through the disconnection port 28, the line assembly is disconnected, and the electromagnet 27 loses its magnetic property, so that the electromagnet 27 does not have an obstructing effect on the operation of the drive shaft 23.

It is to be understood that in the claims, the specification of the present invention, all "including … …" are to be interpreted in an open-ended sense, i.e., in a sense equivalent to "including at least … …", and not in a closed sense, i.e., in a sense not to be interpreted as "including only … …".

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Claims

1. A physical signal gas tightness detection device of an automobile hub comprises a frame body (1), a control part (2) fixedly arranged on the frame body (1) and used for controlling the start and stop of other kinetic energy elements, a workbench (3) fixedly arranged above the frame body (1), a detection table (4) arranged on the workbench (3) and capable of carrying out small-amplitude height adjustment relative to the workbench (3), a base (5) detachably fixed on the detection table (4) and used for placing a wheel hub, four rolling parts fixedly arranged on the workbench (3) and positioned at two sides of the detection table (4) and positioned at four corners of a rectangle, a cavity matched with the outer ring of the wheel hub to be detected is arranged above the base (5), an air hole (6) is formed in the center of the base (5), a ventilation assembly capable of inflating the air hole (6) and upwards discharging gas in the air hole (6) is arranged in the detection table (4), the method is characterized in that: the press rolling part comprises a positioning table (7) fixedly arranged on the workbench (3), a lifting rotating rod (8) which can be lifted and rotated and is arranged on the positioning table (7), a press rolling block (9) fixedly arranged above the lifting rotating rod (8), a main shaft (10) transversely rotatably arranged on the press rolling block (9) and both ends of the main shaft extend to the outer side of the press rolling block (9), and a press roller (11) fixedly arranged at one end of the main shaft (10), be equipped with first spacing ring body in main shaft (10), be equipped with first spacing annular in pressure rolling piece (9), first spacing ring body is in first spacing annular makes main shaft (10) can not transversely break away from for pressure rolling piece (9), and lifting rotating rod (8) realize oscilaltion and realize deflecting under the effect of a deflection drive assembly under the effect of a lift drive assembly, and rotation is realized under the effect of a rotation drive assembly in main shaft (10).

2. The device for detecting the air tightness of the physical signals of the automobile hub according to claim 1, characterized in that: the lifting driving component comprises a positioning column (12) vertically and fixedly arranged on the frame body (1), a lifting support plate (13) vertically and slidably arranged on the positioning column (12), a threaded rod (14) vertically and rotatably arranged on the frame body (1) and in threaded connection with the lifting support plate (13), a lifting driving element and a transmission component (15) fixedly arranged on the frame body (1) and used for driving the threaded rod (14) to rotate, four matching bodies (16) fixedly arranged on the lifting support plate (13), the four matching bodies (16) are respectively used for being in rotating fit with the four lifting rotating rods (8), a through hole is formed in each matching body (16), a circle of second limiting ring groove is formed in the side wall of the through hole, a circle of first limiting ring body is arranged on each lifting rotating rod (8), each lifting rotating rod (8) penetrates through the through hole and is rotatably connected with the corresponding matching body (16), the first limiting ring body is positioned in the second limiting ring groove to realize vertical limiting of each lifting rotating rod (8) relative to the corresponding matching body (16), after the lifting support plate (13) moves in the height direction, the lifting rotating rod (8) is driven by the matching body (16) to synchronously lift.

3. The device for detecting the air tightness of the physical signals of the automobile hub according to claim 2, characterized in that: the deflection driving component comprises deflection driving components which are symmetrically arranged on a lifting support plate (13), deflection gears (17) which are fixedly arranged at the end part of the bottom end of a lifting rotating rod (8), deflection driving elements and a speed changer component (18) which are fixedly arranged below the lifting support plate (13), wherein the deflection driving components comprise limit blocks (19) which are fixedly arranged on the lifting support plate (13) and are provided with transverse limit holes, and bidirectional gear bodies (20) which are transversely arranged in a sliding manner through the transverse limit holes, racks are respectively arranged at the transverse two sides of the bidirectional gear bodies (20), the racks are respectively matched and connected with the deflection gears (17) at the side, the two bidirectional gear bodies (20) are respectively matched and connected with a bidirectional screw rod (21) in a thread manner, the bidirectional screw rod (21) is rotatably arranged on the lifting support plate (13), and the two bidirectional screw rods (21) and the two bidirectional gear bodies (20) are respectively provided with forward threads and reverse threads in a thread manner, a bidirectional screw (21) is in pulley engagement with the yaw drive element and the output shaft of the transmission assembly (18).

4. The device for detecting the air tightness of the physical signals of the automobile hub according to claim 2 or 3, characterized in that: the rotary driving assembly comprises a driven gear (22) fixedly arranged on a main shaft (10) and back to one end of a pressing roller (11), a driving shaft (23) transversely arranged on a detection table (4) in a rotating mode and with two ends penetrating out of the detection table (4), two driving gears (24) fixedly arranged at two ends of the driving shaft (23), a rotary driving element and a transmission assembly fixedly arranged in the detection table (4) and used for driving the driving shaft (23) to rotate, the driving gear (24) is coplanar with the two driven gears (22) on the same side, and the driven gear (22) can be meshed with the driving gear (24) below along with the descending of a pressing roller block (9).

5. The device for detecting the air tightness of the physical signals of the automobile hub according to claim 4, characterized in that: a weight (25) is arranged at the eccentric position on the driven gear (22), and when the driven gear (22) is not restrained: the weight (25) drives the driven gear (22) to deflect under the action of gravity until the weight (25) is located at the lowest position of the driven gear (22), so that the automatic positioning calibration of the driven gear (22) is completed; the magnetic circuit breaker is characterized in that a plurality of magnets (26) are uniformly distributed on the circumference of the driving gear (24), an electromagnet (27) is further arranged at a position, close to the driving gear (24), on the workbench (3), a circuit assembly is fixedly arranged on the frame body (1), the electromagnet (27) is arranged in the circuit assembly, a circuit breaking interface (28) is arranged on the circuit assembly, a guide rod (29) with electric conductivity is arranged on the lifting support plate (13) in a transverse fixing frame, two ends of the circuit breaking interface (28) are located at a path where the guide rod (29) lifts along with the lifting support plate (13), the driving gear (24), the workbench (3) and the positioning table (7) around the driving gear (24) and the driving gear (24) are made of nonmagnetic materials, the circuit assembly is formed into a path when the guide rod (29) passes through the circuit breaking interface (28) after the height of the guide rod is changed, and the electromagnet (27) generates magnetism to adsorb the magnets (26) which are closest to the driving gear and the positioning table, and completing the automatic positioning and calibration of the driving gear (24).

6. The device for detecting the air tightness of the physical signals of the automobile hub according to claim 2 or 3, characterized in that: the positioning columns (12) are two, the threaded rods (14) are four, chain wheels are fixedly arranged at the bottoms of the threaded rods (14), the four chain wheels are in transmission fit through chains, and the lifting driving element and the transmission component (15) are used for driving one of the chain wheels to rotate.