CN114054804B

CN114054804B - Mechanical equipment for hub machining and using method thereof

Info

Publication number: CN114054804B
Application number: CN202111350438.9A
Authority: CN
Inventors: 李洪涛; 苏强
Original assignee: Heilongjiang University of Science and Technology
Current assignee: Heilongjiang University of Science and Technology
Priority date: 2021-11-15
Filing date: 2021-11-15
Publication date: 2022-08-09
Anticipated expiration: 2041-11-15
Also published as: CN114054804A

Abstract

A mechanical device for processing a hub and a using method thereof relate to a device and a method for processing the hub. The plummer sets up the U-shaped dado, the bottom plate is articulated with the plummer opening side, the fixed cam of slope control motor supports and closes the mouth side at the plummer, the spacing ring is fixed in the plummer top, the riser is fixed in the spacing ring top, the lift that the lift control motor hookup transmission lead screw control sleeve pipe snatched the arm, the sleeve pipe snatchs the arm lower extreme and sets up four jack catchs, four jack catchs the fixed cross connecting band in bottom, the dismounting rod is connected fixedly with cross connecting band center, the plummer snatchs the arm with the sleeve pipe and corresponds the department and sets up the through-hole and the installation dismantlement kicking block, the kicking block is dismantled in kicking block control motor control and is stretched out or withdrawed, drilling part fixes in the cantilever beam below and stretches into the inside border position of spacing ring. The structure is simple, cost control is facilitated, and meanwhile full-automatic production with high precision and high efficiency can be achieved.

Description

Mechanical equipment for hub machining and using method thereof

Technical Field

The invention relates to a hub machining device and method, in particular to a mechanical device for hub machining and a using method thereof, and belongs to the technical field of automobile accessory production and machining.

Background

The hub is a metal part which supports the tire and is arranged on the shaft at the center, and no matter the conventional tire with the inner tube or the vacuum tire which is widely applied at present needs to process a valve hole communicated with a tire groove on the outer rim after the hub is produced and molded, the tire with the inner tube needs a valve core on the inner tube to extend out of the valve hole, and the vacuum tire needs to directly install the valve core on the valve hole.

At present, the machining of the valve hole is mainly semi-automatic mechanical equipment, the drilling tool is used for drilling after the wheel hub is positioned by manually combining the auxiliary clamp, on one hand, more manpower is required to be occupied naturally, the cost of workers capable of skilled operation is high, and on the other hand, the machining precision and the production efficiency are difficult to obtain higher guarantee. Therefore, a full-automatic mechanical device capable of performing on-line water flowing processing on a valve hole of a hub is needed to solve the problems of manpower waste, low processing precision and low production efficiency.

Disclosure of Invention

In order to solve the defects in the prior art, the invention provides mechanical equipment for hub machining and a using method thereof.

In order to achieve the purpose, the invention adopts the following technical scheme:

a mechanical device for processing a wheel hub comprises a device support, a lifting control motor, a screw rod, a sleeve grabbing arm, a dismounting rod, a dismounting ejector block, an ejector block control motor, a bottom plate, an inclination control motor and a drilling part, wherein the device support comprises a bearing platform, a limiting ring and a vertical plate, the edge of the bearing platform is provided with a U-shaped protective wall, the inner wall of the closed side of the bearing platform is a positioning arc surface attached to the wheel hub, the bottom plate is provided with a hinged seat and hinged with the bottom of the open side of the bearing platform, the inclination control motor is fixed on the bottom plate, an output shaft of the inclination control motor is fixed at the bottom of the closed side of the bearing platform, the limiting ring is fixed above the bearing platform, the inner ring surface of the limiting ring is matched with the edge profile of the wheel hub, the vertical plate is fixed above the limiting ring, the screw rod is coaxially arranged above the limiting ring, the upper end of the screw rod is connected and driven by the lifting control motor fixed on the vertical plate, a bearing seat is arranged on the vertical plate and is rotatably connected with the upper end of the screw rod, two fixed guide bars in bearing frame bottom both sides, the sleeve pipe snatchs the arm cover and establishes on the lead screw and its upper end sets up the nut and connects the cooperation soon with the lead screw, the sleeve pipe snatchs the arm both sides set up the guiding hole with guide bar sliding fit, the sleeve pipe snatchs four jack catchs integrative four jack catchs of arranging and downwardly extending of equidistant setting in arm lower extreme, four jack catch bottoms set up the conical surface dop to the outside arch respectively, four jack catch bottom fixed cross connecting band, dismantle the pole upper end with cross connecting band center is connected fixedly, and the dismantlement pole lower extreme sets up a sole, and the plummer snatchs the arm with the sleeve pipe and corresponds the department and set up the through-hole and install and dismantle the kicking block, kicking block control motor control dismantle the kicking block and stretch out or withdraw the through-hole, drilling part fixes in the cantilever beam below that the riser set up and stretches into the inside border position of spacing ring.

A use method of mechanical equipment for hub machining comprises the following steps:

the method comprises the following steps: the output shaft of the motor is controlled to rotate to a cam low-point position to support the bearing table, so that the opening side of the bearing table is higher than the closed side, the hub is conveyed into the bearing table through an external conveying mechanism through the opening side, and the hub slides to the closed side of the bearing table to be attached to and positioned by the positioning cambered surface;

step two: the lifting control motor drives the screw rod to rotate to control the sleeve grabbing arm to descend, four clamping jaws stretch into the hub shaft hole under the action of elastic deformation and complete clamping grabbing through four conical surface clamping heads, then the lifting control motor drives the screw rod to rotate reversely to control the sleeve grabbing arm to ascend until the hub is lifted to the inside of the limiting ring, the edge of the hub is machined into a valve hole under the action of the drilling part, and the ejector block control motor controls the dismounting ejector block to stretch out of the through hole;

step three: the lifting control motor drives the screw rod to rotate once again to control the sleeve grabbing arm to descend, the foot supporting plate is supported on the disassembling ejector block firstly, the sleeve grabbing arm continues to descend until the upper end of the disassembling rod props against the center of the cross-shaped connecting belt to move upwards to pull the four clamping jaws to contract inwards to separate from the hub shaft hole, the hub is disassembled and falls on the bearing platform, then the lifting control motor drives the screw rod to rotate in the reverse direction to control the sleeve grabbing arm to ascend to the initial position again, the ejector block controls the disassembling ejector block to withdraw the through hole again, the output shaft of the tilting control motor rotates to the high-point of the cam to support the bearing platform, the closed side of the bearing platform is higher than the open side, and the hub slides out of the bearing platform and is transferred through the external conveying mechanism;

step four: and repeating the first step to the third step to carry out continuous drilling operation of the valve hole.

Compared with the prior art, the invention has the beneficial effects that: the bottom of the equipment support is a bearing platform and is hinged with a bottom plate, the inclination control can be realized through a cam driven by an inclination control motor to realize the entering and the sending of a hub, the positioning cambered surface of the closed side inner wall of the U-shaped protective wall can realize the positioning of the hub, the limiting ring in the middle of the equipment support can play a limiting role when the hub is grabbed and lifted by the sleeve grabbing arm, the drilling part can be matched to efficiently complete the drilling operation of a valve hole on the hub, the lifting control motor and the sleeve grabbing arm are installed and carried on the vertical plate at the top of the equipment support, the disassembling rod, the disassembling top block and four clamping jaws of the sleeve grabbing arm are skillfully matched, the hub can be grabbed, lifted, disassembled and laid down, the structure is simple, the cost control is facilitated, the high-precision and high-efficiency full-automatic production can be realized, and the popularization and application values are good.

Drawings

FIG. 1 is an isometric view of the overall construction of the machine for hub machining of the present invention;

FIG. 2 is an isometric view of the assembled structure of the cannula grabber arm and the removal rod of the present invention;

FIG. 3 is an isometric view of an assembly structure of the disassembled top block and the top block control motor of the present invention;

FIG. 4 is an isometric view of the present invention in a hub access, cannula grabber arm grabbing position;

FIG. 5 is an isometric view of the present invention in a casing grabber arm raised, hub drilling condition;

fig. 6 is an isometric view of the present invention with the cannula grabber arm removed and the hub delivered.

Detailed Description

The technical solutions in the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the invention, rather than all embodiments, and all other embodiments obtained by those skilled in the art without any creative work based on the embodiments of the present invention belong to the protection scope of the present invention.

As shown in fig. 1 to 3, a mechanical apparatus for hub machining and a method of using the same include an apparatus support 1, a lift control motor 2, a screw 3, a sleeve grasping arm 4, a detaching lever 6, a detaching top block 8, a top block control motor 9, a bottom plate 10, an inclination control motor 11, and a drilling part 12.

Referring to fig. 1, the equipment support 1 includes a bearing platform 1-1 for supporting and positioning a hub 13, a limiting ring 1-2 for limiting the hub 13 in a lifting and drilling process, and a vertical plate 1-3 for mounting a lifting control motor 2 and a casing grabbing arm 4.

The edge of the bearing table 1-1 is provided with a U-shaped protective wall, the inner wall of the closed side of the bearing table is a positioning arc surface 1-4 which is attached to the hub 13, when the hub 13 is sent into the bearing table 1-1, the closed side of the bearing table 1-1 inclines downwards to enable the hub 13 to slide to and be attached to the positioning arc surface 1-4, the positioning of the hub 13 can be simply and rapidly completed, the adjacent positions of the inner walls of the two sides of the U-shaped protective wall can be set to be transition slopes which gradually shrink to the positioning arc surface 1-4, and the stability that the hub 13 slides to and is attached to the positioning arc surface 1-4 is improved.

The base plate 10 is provided with a hinge seat 10-1 hinged with the bottom of the opening side of the bearing platform 1-1, the inclination control motor 11 is fixed on the base plate 10, an output shaft of the inclination control motor 11 is fixed with the cam 11-1 and supported at the bottom of the closing side of the bearing platform 1-1, the opening side of the bearing platform 1-1 is higher than the closing side when the low point of the cam 11-1 supports, the state is an entering state of the hub 13 to realize that the hub 13 slides to and is attached to the positioning cambered surface 1-4, the closing side of the bearing platform 1-1 is higher than the opening side when the high point of the cam 11-1 supports, the state is a sending-out state of the hub 13 to realize that the hub 13 slides out of the bearing platform 1-1 to realize the transfer of subsequent processing.

The limiting ring 1-2 can be fixed above the bearing platform 1-1 through an arc-shaped support arm (without influencing the contact between the hub 13 and the positioning arc surface 1-4), and the inner ring surface of the limiting ring is matched with the edge profile of the hub 13, so that the hub 13 is directly positioned under the limiting ring 1-2 when the hub 13 is attached to the positioning arc surface 1-4. Furthermore, a guide slope surface is arranged at the lower end of the limiting ring 1-2 in an outward expansion mode, and the wheel hub 13 can enter conveniently.

The vertical plate 1-3 is fixed above the limiting ring 1-2, the screw rod 3 is coaxially arranged above the limiting ring 1-2, the upper end of the screw rod is connected and transmitted through the lifting control motor 2 fixed on the vertical plate 1-3, the vertical plate 1-3 is provided with a bearing seat 5 which is rotatably connected with the upper end of the screw rod 3, two guide rods 5-1 are fixed on two sides of the bottom of the bearing seat 5, the sleeve grabbing arm 4 is sleeved on the screw rod 3, the upper end of the sleeve grabbing arm is provided with a nut 4-1 which is matched with the screw rod 3 in a screwing mode, two sides of the sleeve grabbing arm 4 are provided with guide holes 4-2 which are matched with the guide rods 5-1 in a sliding mode, and therefore the lifting of the sleeve grabbing arm 4 can be controlled through the forward and reverse rotation of the lifting control motor 2.

Referring to fig. 2, four claws 4-3 which are arranged at equal intervals and extend downwards and have certain elastic deformation are integrally arranged at the lower end of a sleeve grabbing arm 4, conical surface chucks 4-4 are arranged at the bottom ends of the four claws 4-3 in an outward protruding mode respectively, so that the four claws 4-3 can complete clamping grabbing after extending into a shaft hole of a hub 13, a cross-shaped connecting belt 7 is fixed at the bottom ends of the four claws 4-3, the upper end of a dismounting rod 6 is fixedly connected with the center of the cross-shaped connecting belt 7, and a supporting plate 6-1 is arranged at the lower end of the dismounting rod 6. Furthermore, the lower end of the sleeve grabbing arm 4 is arranged in a closed manner, a square supporting cylinder 4-5 is integrally and coaxially arranged on the inner side of each of the four clamping jaws 4-3, four clamping grooves for supporting and limiting the cross-shaped connecting belt 7 are formed in the lower end of each square supporting cylinder 4-5, the stability of the center of the cross-shaped connecting belt 7 when the center of the cross-shaped connecting belt is pushed up and moved upwards by the disassembling rod 6 is enhanced, in addition, in order to avoid the inclination of the disassembling rod 6, a hollow pipe body is preferably adopted for the disassembling rod 6, a limiting rod is integrally and coaxially arranged on the inner side of each square supporting cylinder 4-5 at the lower end of the sleeve grabbing arm 4, and the limiting rod is inserted into the upper end of the disassembling rod 6, so that the displacement of the disassembling rod 6 is limited in the axial direction of the disassembling rod 6.

Referring to fig. 1 and 3, through holes 1-5 are formed in the corresponding positions of the bearing platform 1-1 and the sleeve grabbing arm 4, a disassembly ejector block 8 is installed, the ejector block control motor 9 controls the disassembly ejector block 8 to extend out of or retract into the through holes 1-5, the drilling component 12 is fixed below cantilever beams 1-7 arranged on the vertical plate 1-3 and extends into the inner edge position of the limiting ring 1-2, and drilling operation is performed after a hub 13 enters the limiting ring 1-2 to complete a valve hole 13-1. Specifically, a mounting seat 1-6 is arranged at the position, corresponding to a through hole 1-5, of the bottom of a bearing platform 1-1 and used for fixing a top block control motor 9, an internal thread is arranged on the through hole 1-5, a disassembly top block 8 is in the shape of a circular groove with an open bottom and is provided with an external thread screwed in the through hole 1-5, a circular pipe joint 8-1 is coaxially arranged on the inner side of the bottom of the disassembly top block 8, two notches 8-2 are oppositely processed on the side wall of the circular pipe joint 8-1, a pin rod 9-1 is fixedly inserted into an output shaft of the top block control motor 9 along the radial direction and extends into the circular pipe joint 8-1, the pin rod 9-1 is inserted between the two notches 8-2, so that the disassembly top block 8 can be driven to rotate in the through hole 1-5 and lift under the action of the thread through the positive and negative rotation control of the top block control motor 9, thereby realizing the control of the extension or retraction of the disassembly top block 8 from the through holes 1-5. It should be noted that this is just an example of the extension or retraction control of the detachable top block 8, and other forms that can be extended or retracted through hydraulic control and the like are replaced by conventional means of the present form, and the present invention shall also fall into the protection of the present invention.

The lifting control motor 2, the jacking block control motor 9 and the inclination control motor 11 can adopt servo motors to carry out encoding control on the rotation angle and the action interval in advance in combination with the production process, and the drilling part 12 can adopt motor elements to drive a drill bit to continuously work.

referring to fig. 4, step one: the output shaft of the inclination control motor 11 rotates to a low point of the cam 11-1 to support the bearing platform 1-1, so that the opening side of the bearing platform 1-1 is higher than the closed side, the hub 13 is sent into the bearing platform 1-1 through the opening side by an external transmission mechanism, the hub 13 slides to the closed side of the bearing platform 1-1 to be attached and positioned with the positioning arc surface 1-4, so that the hub 13 is directly positioned under the limiting ring 1-2, the shaft hole of the hub 13 is opposite to the lower end of the sleeve grabbing arm 4, and after the sleeve grabbing arm 4 descends, four claws 4-3 can extend into the shaft hole of the hub 13;

referring to fig. 5, step two: the lifting control motor 2 drives the screw rod 3 to rotate to control the sleeve grabbing arm 4 to descend, four clamping claws 4-3 stretch into a shaft hole of the hub 13 under the action of elastic deformation and complete clamping grabbing through four conical surface clamping heads 4-4, then the lifting control motor 2 drives the screw rod 3 to reversely rotate to control the sleeve grabbing arm 4 to ascend until the hub 13 is lifted to the inside of the limiting ring 1-2, the edge of the hub 13 is processed into a valve hole 13-1 under the action of the drilling part 12, and the jacking block control motor 9 controls the dismounting jacking block 8 to stretch out of the through hole 1-5 to prepare for the subsequent sleeve grabbing arm 4 to descend and dismount the hub 13;

referring to fig. 6, step three: the lifting control motor 2 drives the screw rod 3 to rotate again to control the sleeve grabbing arm 4 to descend, the foot supporting plate 6-1 is firstly supported on the disassembling ejector block 8, the sleeve grabbing arm 4 continuously descends until the upper end of the disassembling rod 6 props against the center of the cross connecting belt 7 to move upwards to pull the four claws 4-3 to contract inwards to be separated from the shaft hole of the hub 13, the hub 13 is disassembled and falls on the bearing platform 1-1, then the lifting control motor 2 drives the screw rod 3 to rotate reversely to control the sleeve grabbing arm 4 to ascend to the initial position again, the ejector block control motor 9 controls the disassembling ejector block 8 to withdraw the through holes 1-5 again, the output shaft of the inclination control motor 11 rotates to the cam 11-1 high point to support the bearing platform 1-1, so that the closed side of the bearing platform 1-1 is higher than the opening side, and the hub 13 slides out of the bearing platform 1-1 under the action of self weight to be transferred by an external transfer mechanism for subsequent processing, so far, the valve hole 13-1 of the single hub 13 is processed;

step four: and repeating the first step to the third step to perform continuous drilling operation of the valve holes 13-1, so that the continuous full-automatic machining of the valve holes 13-1 of the plurality of hubs 13 can be realized.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The utility model provides a mechanical equipment is used in hub processing which characterized in that: comprises an equipment support (1), a lifting control motor (2), a screw rod (3), a sleeve grabbing arm (4), a dismounting rod (6), a dismounting top block (8), a top block control motor (9), a bottom plate (10), an inclination control motor (11) and a drilling part (12), wherein the equipment support (1) comprises a bearing platform (1-1), a limiting ring (1-2) and a vertical plate (1-3), the edge of the bearing platform (1-1) is provided with a U-shaped protective wall, the inner wall of the closed side of the bearing platform is a positioning arc surface (1-4) jointed with a hub (13), the bottom plate (10) is provided with a hinge seat (10-1) and is hinged with the bottom of the open side of the bearing platform (1-1), the inclination control motor (11) is fixed on the bottom plate (10) and an output shaft fixing cam (11-1) of the inclination control motor is supported at the bottom of the closed side of the bearing platform (1-1), the limiting ring (1-2) is fixed above the bearing platform (1-1), the inner ring surface of the limiting ring is matched with the edge profile of the wheel hub (13), the vertical plate (1-3) is fixed above the limiting ring (1-2), the screw rod (3) is coaxially arranged above the limiting ring (1-2), the upper end of the screw rod is connected and transmitted through the lifting control motor (2) fixed on the vertical plate (1-3), a bearing seat (5) is arranged on the vertical plate (1-3) and is rotationally connected with the upper end of the screw rod (3), two guide rods (5-1) are fixed on two sides of the bottom of the bearing seat (5), the sleeve grabbing arm (4) is sleeved on the screw rod (3), a nut (4-1) is arranged on the upper end of the sleeve grabbing arm and is in screwed connection and matching with the screw rod (3), guide holes (4-2) are arranged on two sides of the sleeve grabbing arm (4) and are in sliding fit with the guide rods (5-1), four claws (4-3) which are arranged at equal intervals and extend downwards are integrally arranged at the lower end of the sleeve grabbing arm (4), the bottom ends of the four clamping jaws (4-3) are respectively provided with a conical surface clamping head (4-4) in an outward protruding way, the bottom ends of the four clamping jaws (4-3) are fixed with a cross connecting belt (7), the upper end of the dismounting rod (6) is fixedly connected with the center of the cross connecting belt (7), the lower end of the dismounting rod (6) is provided with a supporting foot plate (6-1), a through hole (1-5) is arranged at the corresponding position of the bearing platform (1-1) and the sleeve grabbing arm (4) and a dismounting top block (8) is installed, the top block control motor (9) controls the disassembly top block (8) to extend out of or retract into the through hole (1-5), the drilling part (12) is fixed below a cantilever beam (1-7) arranged on the vertical plate (1-3) and extends into the inner edge position of the limiting ring (1-2).

2. The machine tool for hub machining according to claim 1, wherein: the bearing table is characterized in that a mounting seat (1-6) used for fixing a jacking block control motor (9) is arranged at the position, corresponding to the through hole (1-5), of the bottom of the bearing table (1-1), the through hole (1-5) is provided with an internal thread, the dismounting jacking block (8) is in a circular groove shape with an open bottom and is provided with an external thread and screwed in the through hole (1-5), a circular pipe joint (8-1) is coaxially arranged on the inner side of the bottom of the dismounting jacking block (8), two openings (8-2) are oppositely processed on the side wall of the circular pipe joint (8-1), a pin rod (9-1) is fixedly inserted into an output shaft of the jacking block control motor (9) along the radial direction and extends into the circular pipe joint (8-1), and the pin rod (9-1) is inserted between the two openings (8-2).

3. The machine tool for hub machining according to claim 1, wherein: the lower end of the sleeve grabbing arm (4) is closed, a square supporting cylinder (4-5) is integrally and coaxially arranged on the inner sides of the four clamping jaws (4-3), and four clamping grooves for supporting and limiting the cross connecting belt (7) are machined at the lower end of the square supporting cylinder (4-5).

4. The machine tool for hub machining according to claim 3, wherein: the dismounting rod (6) is a hollow pipe body, the lower end of the sleeve grabbing arm (4) is integrally and coaxially provided with a limiting rod at the inner side of the square supporting cylinder (4-5), and the limiting rod is inserted into the upper end of the dismounting rod (6).

5. The machine tool for hub machining according to claim 1, wherein: the lower end of the limiting ring (1-2) is provided with a guide slope surface in an outward expansion mode.

6. The use method of the mechanical equipment for hub machining according to claim 1, characterized in that: the using method comprises the following steps:

the method comprises the following steps: an output shaft of an inclination control motor (11) rotates to a low point of a cam (11-1) to support a bearing table (1-1), so that the opening side of the bearing table (1-1) is higher than the closed side, a hub (13) is conveyed into the bearing table (1-1) through an external conveying mechanism through the opening side, and the hub (13) slides to the closed side of the bearing table (1-1) to be attached and positioned with a positioning cambered surface (1-4);

step two: the lifting control motor (2) drives the screw rod (3) to rotate to control the sleeve grabbing arm (4) to descend, four clamping jaws (4-3) extend into a shaft hole of the hub (13) under the action of elastic deformation and complete clamping grabbing through four conical surface clamping heads (4-4), then the lifting control motor (2) drives the screw rod (3) to reversely rotate to control the sleeve grabbing arm (4) to ascend until the hub (13) is lifted into the limiting ring (1-2), the edge of the hub (13) is machined into a valve hole (13-1) under the action of the drilling part (12), and the ejector block control motor (9) controls the dismounting ejector block (8) to extend out of the through hole (1-5);

step three: the lifting control motor (2) drives the screw rod (3) to rotate to control the sleeve grabbing arm (4) to descend again, the foot supporting plate (6-1) is firstly supported on the disassembling ejector block (8) and the sleeve grabbing arm (4) continues to descend until the upper end of the disassembling rod (6) props against the center of the cross-shaped connecting belt (7) to move upwards to pull the four clamping jaws (4-3) to contract inwards to be separated from the shaft hole of the hub (13), the hub (13) is disassembled and falls on the bearing platform (1-1), then the lifting control motor (2) drives the screw rod (3) to reversely rotate to control the sleeve grabbing arm (4) to ascend to the initial position again, the ejector block control motor (9) controls the disassembling ejector block (8) to withdraw the through holes (1-5) again, and the output shaft of the inclination control motor (11) rotates to the high-point of the cam (11-1) to support the bearing platform (1-1), the closed side of the bearing table (1-1) is higher than the open side, and the hub (13) slides out of the bearing table (1-1) and is transferred through an external transmission mechanism;

step four: and repeating the first step to the third step to carry out continuous drilling operation of the valve hole (13-1).