CN213498253U

CN213498253U - Valve seat grinding and clamping device

Info

Publication number: CN213498253U
Application number: CN202022441773.7U
Authority: CN
Inventors: 许波; 李黎; 周志强; 秦龙; 刘兰; 吴绪敏
Original assignee: Chongqing Chuanyi Control Valve Co Ltd
Current assignee: Chongqing Chuanyi Control Valve Co Ltd
Priority date: 2020-10-28
Filing date: 2020-10-28
Publication date: 2021-06-22
Anticipated expiration: 2030-10-28

Abstract

The utility model relates to a supporting grinding clamping equipment field of ball core and disk seat, disclose disk seat grinding clamping device, including two fixture, the fixture all includes flexible clamping unit and axial force transmission unit, axial force transmission unit includes fixture base, disk seat transmission main shaft, transmission shaft and power pack, disk seat transmission main shaft and fixture base rotate to be connected, the mounting hole has been seted up in the disk seat transmission main shaft, install rectangle linear bearing in the mounting hole, the transmission shaft passes the rectangle hole of rectangle linear bearing, power pack drives the rotation of disk seat transmission main shaft; the flexible clamping unit comprises a chuck seat and a grinding tool, the grinding tool is fixedly connected with the chuck seat, a universal coupling is connected between the transmission shaft and the chuck seat, and a pre-pressure generating unit is arranged between the flexible clamping unit and the axial force transmission unit. The utility model discloses can guarantee that disk seat and ball core pair the required precision of grinding, improve disk seat and ball core cooperation precision to improve sealed effect.

Description

Valve seat grinding and clamping device

Technical Field

The utility model relates to a supporting grinding device field of ball core and disk seat, concretely relates to clamping device is ground to disk seat.

Background

The valve is a main control execution mechanism for medium circulation of the pipeline, and the medium in the pipeline can be adjusted, cut off and the like through the valve. The ball valve can reach VI level or zero leakage as the leakage level of the pipeline cut-off valve, and the hard sealing ball valve is subjected to hard alloy spraying or spray welding hardening treatment on the surface of the ball core and the sealing surface of the valve seat, so that the service life of the valve is prolonged in the environments of corrosion resistance, scouring resistance, wear resistance, high temperature and high pressure, and the hard sealing ball valve can be used in the environment with severe working conditions, and is widely applied to the fields of petroleum, chemical industry, metallurgy, power plants, coal chemical industry and the like.

The valve core is used as the most key part for sealing the ball valve, and two sealing pairs consisting of a ball core and two valve seats usually play a role in blocking media. Therefore, the machining precision, form and position tolerance and roughness of the ball core and the valve seat determine the sealing performance. Therefore, after finishing the common hard seal ball valve, the ball core and the valve seat are required to be matched and ground so as to ensure the joint of the sealing surface of the ball core and the valve seat.

In order to improve the matching grinding efficiency of the ball core and the valve seat, a manual grinding mode and horizontal ball core double-valve seat grinding equipment are adopted for grinding in the prior art, wherein the horizontal ball core double-valve seat grinding equipment is of a horizontal cross structure, the horizontal ball core double-valve seat grinding equipment can grind two valve seats and one ball core simultaneously, and therefore the sealing surfaces of the two valve seats are almost identical and can be interchanged. Because the rotation center of the valve seat cannot be completely coincided with the center of the ball core, the valve seat needs to have a certain deflection angle during matching and grinding, even if the clamping mechanism for clamping the valve seat is in flexible connection, the valve seat can deflect, the valve seat is attached to the ball core and ground, so that the centers of the valve seat and the ball core can be coincided as much as possible, and the grinding precision is improved; a certain pre-pressure is required to be provided during grinding, so that the valve seat can have a certain grinding pressure on the ball core; the valve seat also needs to move axially within a certain range during grinding; the precision requirement of the paired grinding can be ensured only when the conditions are met. The grinding equipment in the prior art often can not realize the three requirements simultaneously, and the grinding precision and the sealing performance of the ball core and the valve seat which are ground and processed are poor.

SUMMERY OF THE UTILITY MODEL

The utility model provides a valve seat grinding and clamping device, aiming at enabling the valve seat to deflect at an angle when the valve seat and a ball core are ground; certain pre-pressure can be provided during grinding; during grinding, the valve seat needs to move axially within a certain range, so that the precision requirement of matched grinding of the valve seat and the ball core is met.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the valve seat grinding and clamping device comprises two clamping mechanisms which are positioned on the same plane and vertically face each other, each clamping mechanism comprises a flexible clamping unit and an axial force transmission unit, each axial force transmission unit comprises a clamping mechanism base, a valve seat transmission main shaft, a transmission shaft and a power unit, the valve seat transmission main shaft is rotatably connected with the clamping mechanism base, a mounting hole is formed in the valve seat transmission main shaft, a rectangular linear bearing with a rectangular inner hole is mounted in the mounting hole, the cross section of the transmission shaft is rectangular, the transmission shaft penetrates through the rectangular hole of the rectangular linear bearing, and the power unit drives the valve seat transmission main shaft to rotate; the flexible clamping unit comprises a chuck seat and a grinding tool, the grinding tool is fixedly connected with the chuck seat, a universal coupling is connected between the transmission shaft and the chuck seat, and a pre-pressure generating unit is arranged between the flexible clamping unit and the axial force transmission unit.

The principle and the advantages of the scheme are as follows:

1. the transmission of torque: the two clamping mechanisms in the technical scheme are vertically arranged oppositely, so that the clamping mechanism is suitable for a vertical grinding mode, namely the clamping mechanism is suitable for grinding equipment with a vertical cross structure, the axial force transmission units in the two clamping mechanisms in the technical scheme comprise a clamping mechanism base, a valve seat transmission main shaft, a transmission shaft and a power unit, when the clamping mechanism is actually used, the power unit drives the valve seat transmission main shaft to rotate, so that torque generated by the power unit is transmitted to the transmission shaft through a rectangular linear bearing arranged in a mounting hole of the valve seat transmission main shaft, and then the torque is transmitted to the flexible clamping unit through the transmission shaft, in the technical scheme, the torque transmitted by the valve seat transmission main shaft is transmitted to the flexible clamping unit in a way that the rectangular linear bearing is matched with the transmission shaft with the rectangular cross section, so that the phenomenon that parts are subjected to extremely large bending force when the torque needs to be transmitted by a machine core clamp in the, the swing and the movement required when the valve seat is ground are limited, and when the bending force is large, parts for transmitting torque are deformed, so that the flexible connection (namely, the connection structure capable of enabling the valve seat to generate a deflection angle) fails.

2. The clamping mechanism for mounting the valve seat adopts a flexible connection mode, so that the valve seat can deflect at an angle to swing: the transmission shaft is connected with the chuck seat through the universal coupling in the technical scheme, so that the grinding tool connected with the chuck seat and the valve seat can incline and deflect by a certain angle, the clamping structure can enable the valve seat to deflect by a certain angle, namely the valve seat can swing, the center of the valve seat can coincide with the center of the ball core, and the problem that grinding fails due to the fact that the center of the valve seat and the center of the ball core cannot be completely coincided is solved.

3. The valve seat can move axially within a certain range during grinding: the flexible connection mode is needed when the ball core and the valve seat are matched and ground, and the pre-pressure provided by the pre-pressure generating unit when the ball core and the valve seat are matched and ground is needed to move along the axes of the ball core and the valve seat. According to the technical scheme, the rectangular linear bearing is matched with the transmission shaft, when the two clamping mechanisms are moved to enable the valve seats to cover the surface of the ball core, the valve seats are abutted against the ball core, the two valve seats are enabled to move in opposite directions, the grinding tool, the chuck seat, the universal coupling and the transmission shaft are driven to move simultaneously by the movement of the valve seats, and the transmission shaft moves axially along the rectangular hole of the rectangular linear bearing. The friction coefficient when the transmission shaft and the rectangular linear bearing are matched in the technical scheme greatly reduces the movement, and the phenomena that the friction force caused by other movement modes such as sliding fit is large, clamping stagnation is easy to occur during eccentricity and the like are effectively avoided, so that the valve seats positioned above and below can be better attached to the surface of the ball core during grinding, and the grinding quality is improved.

4. Can provide certain pre-pressure during grinding: in this embodiment, the pre-pressure generating unit disposed between the flexible clamping unit and the axial force transmitting unit can generate pre-pressure on the ball core by the valve seat when the clamping mechanism moves, so that the valve seat provides grinding pressure on the ball core.

Preferably, as an improvement, the pre-pressure generating unit includes a spring seat and a spring, the spring seat is rotatably connected to the transmission shaft, and the spring is located between the spring seat and the clamping mechanism base.

According to the technical scheme, when the clamping mechanism moves to enable the valve seat to be in contact with the ball core, the ball core generates extrusion force on the valve seat to enable the transmission shaft to move towards the direction away from the ball core, the spring seat rotatably connected to the transmission shaft moves backwards due to the backward movement of the transmission shaft, the spring is compressed at the moment, the reaction force generated by the compression of the spring acts on the valve seat to form pre-pressure, and the magnitude of the pre-pressure is determined by the compression amount of the spring.

Preferably, as an improvement, a limit ring is fixedly connected to the spring seat.

The purpose of spacing ring among this technical scheme is the inclination of restriction universal joint when no-load, because of inclination too big influence fixture's removal when avoiding the disk seat to install on fixture.

Preferably, as an improvement, the two ends of the valve seat transmission main shaft are respectively and rotatably connected with the clamping mechanism base through bearings, and the upper end and the lower end of the clamping mechanism base are respectively and fixedly connected with a bearing cover III and a bearing cover II.

The both ends of valve seat transmission main shaft are supported by the bearing respectively among this technical scheme, fix on the fixture base through bearing cap II and bearing cap III to make the rotation that valve seat transmission main shaft can be more steady and transmit the moment of torsion, bearing cap II and bearing cap III can prevent outside dust etc. to get into the bearing, prevent that lubricating oil from spilling over, and can avoid external force to damage the bearing.

Preferably, as an improvement, the spring holder includes a guide sleeve and a connecting plate that are coaxially arranged, the outer diameter of the connecting plate is greater than the outer diameter of the guide sleeve, and two ends of the spring are respectively connected with the bearing cap III and the guide sleeve of the spring holder. So set up, the uide bushing on the spring holder among this technical scheme sets up and is connected with the spring more conveniently, and the uide bushing can play the effect of support and direction to the spring, guarantees the spring more steady in the process of compression and reseing.

Preferably, as an improvement, the sliding holes are formed in two sides of the valve seat transmission main shaft, the transmission shaft is vertically and fixedly connected with an anti-falling pin, and two ends of the anti-falling pin are respectively located in the two sliding holes and are in vertical sliding fit with the sliding holes.

The setting of anticreep round pin can carry on spacingly to the migration range of transmission shaft, prevents that the transmission shaft from deviating from rectangle linear bearing at the removal in-process, and it has the hole of sliding to open on disk seat transmission main shaft, such setting up can make anticreep round pin install the back on the transmission shaft, can be at the downthehole vertical removal of sliding, anticreep round pin not with the pore wall contact in hole of sliding, anticreep round pin only plays the purpose that prevents the transmission shaft from deviating from rectangle linear bearing, can avoid taking place to interfere with other parts when sliding.

Preferably, as an improvement, the power unit includes motor and pulley group, pulley group includes belt pulley I, belt pulley II and belt, belt pulley I with disk seat transmission main shaft fixed connection, belt pulley II with the output shaft fixed connection of motor, the belt be located belt pulley I with between the belt pulley II.

The motor can transmit the torque to the valve seat transmission main shaft through the belt pulley II, the belt and the belt pulley I in the technical scheme, and the power unit works more stably when transmitting the torque in the technical scheme.

Preferably, as an improvement, the motor is a variable frequency motor.

So set up, can be through adjusting inverter motor's rotational speed, make it reach the different rotational speeds that need when grinding different big or small bore ball core disk seats.

Preferably, as an improvement, the mounting hole includes a wide hole and a narrow hole which are coaxially communicated with each other, the diameter of the wide hole is larger than that of the narrow hole, and the rectangular linear bearing is located in the wide hole and in interference fit with the wide hole.

So set up, the mode of installation rectangle linear bearing is simple among this technical scheme, and wide hole and slot form the shoulder hole structure, can play spacing effect to rectangle linear bearing.

Preferably, as an improvement, all be equipped with detection mechanism on the fixture, detection mechanism is including the pressure sensor who is used for detecting the pressure value when disk seat and ball core grind and the torque sensor who is used for detecting the moment of torsion when the disk seat grinds, pressure sensor installs on the fixture base, and pressure sensor's top can with the spring holder offsets, torque sensor installs on power unit.

In the technical scheme, the pressure sensor is arranged on a clamping mechanism base, after the clamping mechanism is moved, the top end of the pressure sensor is in plane contact with the spring seat, the pressure value is transmitted to a numerical control display screen in the prior art, and the pressure values displayed by the two pressure sensors can reach the required pressure by moving the upper clamping mechanism and the lower clamping mechanism; the torque sensor is installed on the power unit, and after the power unit rotates, the torque value is transmitted to the numerical control display screen in the prior art, and the torques of the two clamping mechanisms in grinding are detected in real time.

Drawings

Fig. 1 is a longitudinal sectional view of a first embodiment of the clamping device for grinding a valve seat according to the present invention.

Fig. 2 is a longitudinal section of the valve seat transmission main shaft in the first embodiment of the valve seat grinding and clamping device of the present invention.

Fig. 3 is a left side view of the valve seat transmission main shaft in the first embodiment of the valve seat grinding and clamping device of the present invention.

Fig. 4 is a longitudinal sectional view of a rectangular linear bearing in the first embodiment of the clamping device for grinding a valve seat of the present invention.

Fig. 5 is a cross-sectional view of a rectangular linear bearing in a first embodiment of the clamping device for grinding a valve seat according to the present invention.

Fig. 6 is a diagram illustrating the assembly relationship between the transmission shaft and the rectangular linear bearing in the first embodiment of the clamping device for grinding a valve seat of the present invention.

Fig. 7 is a left side view of the first embodiment of the clamping device for grinding a valve seat according to the present invention.

Fig. 8 is a longitudinal sectional view of a second embodiment of the clamping device for grinding a valve seat according to the present invention.

Fig. 9 is a left side view of the second embodiment of the clamping device for grinding a valve seat according to the present invention.

Detailed Description

The following is further detailed by way of specific embodiments:

reference numerals in the drawings of the specification include: the self-centering device comprises a valve seat 1, a self-centering chuck 2, a chuck seat 3, a limiting ring 4, a universal coupling 5, a spring seat 6, a connecting plate 601, a guide sleeve 602, a bearing cover I7, a shaft elastic retainer ring 8, a bearing 9, a spring 10, a clamping mechanism base 11, a cylindrical roller bearing 12, a bearing cover II13, a flat key 14, a key groove 141, a round nut 15, a belt pulley I16, a pressure sensor 17, a bearing cover III18, a bearing cover IV19, a rectangular linear bearing 20, a transmission shaft 21, a connecting shaft 211, an anti-falling pin 22, a cylindrical roller bearing positioning sleeve 23, a valve seat transmission main shaft 24, a motor 25, a belt 26, a torque sensor 27, a belt pulley II28, a flat end fastening screw 29, a pin shaft I30, a pin shaft II31, a sliding hole 32, a driving shaft 33, a wide hole 34, a narrow hole 35.

Example one

The embodiment is basically as shown in the attached figure 1: disk seat grinds clamping device, including being located the coplanar and vertical just to two fixture that set up, two fixture in this embodiment are applicable to vertical grinding mode promptly for install on vertical grinding device, form vertical cross structure.

Fixture all includes flexible clamping unit and axial force transmission unit, and axial force transmission unit includes fixture base 11, disk seat transmission main shaft 24, transmission shaft 21 and power pack, as shown in fig. 2 and 3, the coaxial fixedly connected with drive shaft 33 in 24 bottom ends of disk seat transmission main shaft in this embodiment, and the diameter of drive shaft 33 is less than the diameter of disk seat transmission main shaft 24, and drive shaft 33 and disk seat transmission main shaft 24 integrated into one piece, and keyway 141 has been seted up to the drive shaft 33 outside.

The valve seat transmission main shaft 24 is rotatably connected with the clamping mechanism base 11, a mounting hole 36 is formed in the valve seat transmission main shaft 24, the rectangular linear bearing 20 with the inner hole being a rectangular hole is installed in the mounting hole 36, the mounting hole 36 comprises a wide hole 34 and a narrow hole 35 which are coaxially communicated with each other, the wide hole 34 is located on the upper portion of the valve seat transmission main shaft 24, and the diameter of the wide hole 34 is larger than that of the narrow hole 35, so that the mounting hole 36 is in a stepped hole shape, as shown in fig. 4 and 5, the rectangular linear bearing 20 is integrally cylindrical, the rectangular hole is formed in the rectangular linear bearing 20 along the axial direction of the rectangular linear bearing, and balls are installed in the rectangular hole. As shown in FIG. 1, the rectangular linear bearing 20 is located in the wide hole 34 of the mounting hole 36 and is in interference fit with the wide hole 34, and the rectangular linear bearing 20 is fastened to the side wall of the wide hole 34 of the valve seat transmission main shaft 24 through the flat-end set screw 29.

The two ends of the valve seat transmission main shaft 24 are rotatably connected with the clamping mechanism base 11 through cylindrical roller bearings 12 respectively, in this embodiment, a cylindrical roller bearing positioning sleeve 23 is sleeved outside the valve seat transmission main shaft 24, and a bearing cover IV19 is fixedly connected to the top end of the cylindrical roller bearing positioning sleeve 23 and the top end of the valve seat transmission main shaft 24 through bolts. The upper end and the lower extreme of fixture base 11 are equipped with bearing cap III18 and bearing cap II13 respectively, and on bearing cap III18 and bearing cap II13 passed through bolt fixed connection fixture base 11 respectively, bearing cap II13 and bearing cap III18 can stop outside dust etc. and get into the bearing, prevent that lubricating oil from spilling over, and can avoid external force to damage the bearing.

As shown in fig. 2, the two sides of the valve seat transmission main shaft 24 are both provided with sliding holes 32, the sliding holes 32 are located in the middle of the valve seat transmission main shaft 24 and are communicated with the narrow holes 35, as shown in fig. 3, the sliding holes 32 are in a rectangular hole structure.

As shown in fig. 6, the top end of the transmission shaft 21 is coaxially welded and fixed with the connection shaft 211, in this embodiment, the cross section of the connection shaft 211 is circular, the cross section of the transmission shaft 21 is rectangular, and the transmission shaft 21 penetrates through the rectangular hole of the rectangular linear bearing 20, because the cross section of the transmission shaft 21 is rectangular, and the rectangular hole of the rectangular linear bearing 20 is rectangular, after the transmission shaft 21 penetrates through the rectangular hole of the rectangular linear bearing 20, idle rotation between the transmission shaft 21 and the rectangular linear bearing 20 can be avoided, that is, the transmission shaft 21 can only vertically move in the rectangular linear bearing 20 and cannot rotate in the rectangular linear bearing 20, and both can only rotate simultaneously, that is, the transmission shaft 21 is driven to rotate while the valve seat transmission main shaft 24 rotates, so that the torque of the valve seat transmission main shaft 24 can be smoothly transmitted to the. In this embodiment, the lower portion of the transmission shaft 21 is vertically welded and fixed with the anti-slip pin 22, as shown in fig. 1, two ends of the anti-slip pin 22 are respectively located in the two sliding holes 32 and vertically slide-fit with the sliding holes 32. In this embodiment, the anti-slip pin 22 does not contact with the inner sidewall of the sliding hole 32, and the anti-slip pin 22 only serves to prevent the transmission shaft 21 from slipping out of the rectangular linear bearing 20.

The power unit is used for driving the valve seat to drive the main shaft 24 to rotate, as shown in fig. 1 and 7, the power unit in the embodiment comprises a motor 25 and a pulley set, the pulley set comprises a pulley I16, a pulley II28 and a belt 26, as shown in fig. 1, the pulley I16 is fixedly connected with the driving shaft 33 through a flat key 14, and is limited and fixed by screwing a round nut 15 into the bottom end of the driving shaft 33. As shown in fig. 7, the belt pulley II28 is fixedly connected to an output shaft of the motor 25, in this embodiment, the belt pulley II28 is coaxially and fixedly connected to the rotating shaft 37 through a flat key, the rotating shaft 37 is fixedly connected to an output shaft of the motor 25 through a coupling (not shown), the belt 26 is located between the belt pulley I16 and the belt pulley II28, and in this embodiment, the motor 25 is a variable frequency motor.

As shown in fig. 1, the flexible clamping unit in this embodiment includes a chuck base 3 and a grinding tool, the grinding tool employs a self-centering chuck 2, and the self-centering chuck 2 is used for clamping a fixed valve seat 1. The self-centering chuck 2 is fixedly connected with the chuck seat 3 through bolts.

Be connected with universal joint 5 between transmission shaft 21 and the chuck seat 3, universal joint 5 adopts single ball-and-socket joint formula universal joint, and this embodiment realizes being connected connecting axle 211 and the universal joint 5 that the round pin axle I30 is connected the transmission shaft 21 top to indirectly realize that transmission shaft 21 is connected with universal joint 5, chuck seat 3 is connected through round pin axle II31 with universal joint 5.

As shown in fig. 1, the preload generation unit in this embodiment includes a spring seat 6 and a spring 10, the spring seat 6 is rotatably connected to the transmission shaft 21, the spring seat 6 is rotatably connected to the connection shaft 211 at the top end of the transmission shaft 21 through a bearing 9, so as to indirectly achieve a rotational connection relationship between the spring seat 6 and the transmission shaft 21, a shaft circlip 8 is coaxially sleeved on the connection shaft 211, a bearing cover I7 is coaxially arranged on the connection shaft 211, and the bearing cover I7 is fixedly connected to the spring seat 6 through a bolt, so as to protect the bearing 9 and prevent external force from damaging the bearing.

The connecting shaft 211 in this embodiment is more convenient to connect with the spring seat 6, and can be adapted to a common ball bearing, so that the rotation relationship between the shaft of the spring 10 and the transmission shaft 21 is realized, and the rotation of the spring seat 6 when the transmission shaft 21 rotates can be avoided.

Spring 10 is located between spring holder 6 and fixture base 11, spring holder 6 includes uide bushing 602 and the connecting plate 601 of coaxial setting in this embodiment, uide bushing 602 and connecting plate 601 integrated into one piece, and uide bushing 602 is circular tubular structure, and connecting plate 601 is circular platelike structure, and the coaxial through-hole that communicates with uide bushing 602 of having seted up of connecting plate 601, and the external diameter of connecting plate 601 is greater than the external diameter of uide bushing 602, and the both ends of spring 10 are connected with bearing cap III18 and the uide bushing 602 of spring holder 6 respectively.

According to the embodiment, the limiting ring 4 is fixedly connected to the connecting plate 601 of the spring seat 6 through a bolt, the limiting ring 4 is of a circular annular structure, an interval is reserved between the limiting ring 4 and the chuck seat 3, the purpose of setting the limiting ring 4 is to limit the inclination angle of the universal coupling 5, and the phenomenon that the clamping mechanism is influenced by the overlarge inclination angle when the self-centering chuck 2 arranged on the clamping mechanism is installed on the valve seat 1 is avoided.

The specific implementation process is as follows: in practical use, the two clamping mechanisms in the embodiment need to be installed on the vertical grinding machine, the two clamping mechanisms can move up and down, and the two clamping mechanisms are arranged oppositely up and down. Two valve seats 1 are respectively clamped on self-centering chucks 2 of the two clamping mechanisms, the ball core is arranged on a vertical grinding machine, and two end faces to be ground on the ball core are respectively opposite to the two valve seats 1.

During grinding, the variable frequency motor 25 is started, the valve seat transmission main shaft 24 is driven to rotate through the belt pulley set, and the rectangular linear bearing 20 is in interference fit with the valve seat transmission main shaft 24 and is fixed in the valve seat transmission main shaft 24 through the flat-end fastening screw 29, and the transmission shaft 21 penetrates through the rectangular linear bearing 20, so that the torque of the valve seat transmission main shaft 24 is transmitted to the transmission shaft 21; the universal coupling 5 is connected with the transmission shaft 21 through a pin shaft I30, and is further connected with the chuck base 3 through a pin shaft II31, the chuck base 3 is connected with the self-centering chuck 2 through a bolt, and the valve seat 1 is clamped on the self-centering chuck 2, so that the transmission shaft 21 transmits the torque to the universal coupling 5, the chuck base 3 and the self-centering chuck 2, and finally transmits the torque to the valve seat 1, so that the valve seat 1 rotates according to the set rotating speed.

In this embodiment, after the two clamping mechanisms move up and down to attach the two valve seats 1 to the surface of the ball core, the valve seats 1 transmit pressure to the transmission shaft 21 through the self-centering chuck 2, the chuck seat 3 and the universal coupling 5, the transmission shaft 21 in the clamping mechanism located above moves backwards through the rectangular hole of the rectangular linear bearing 20, the spring seat 6 fixedly connected with the transmission shaft 21 moves backwards at the same time, at this time, the spring 10 is compressed, and pre-pressure is applied to the ball core through the compression of the spring 10 to ensure that certain pre-pressure exists during grinding, and the magnitude of the pre-pressure is determined by the compression amount of the spring 10. The operation of the clamping mechanism located below is the same as the movement and principle of the clamping mechanism located above, and the description is omitted here.

Because universal joint 5 is connected with chuck seat 3 and transmission shaft 21 respectively in this embodiment, make whole clamping device form the flexonics relation, can make disk seat 1 also can produce the deflection angle with the in-process of ball core contact when universal joint 5 deflects promptly, make disk seat 1 can produce the swing, thereby make the laminating that disk seat 1 can be smooth on the ball core terminal surface, in addition this embodiment because spacing ring 4's setting, can restrict universal joint 5's inclination, avoid disk seat 1 to influence fixture's removal because of inclination is too big when installing on fixture.

Example two

As shown in fig. 8 and 9, the valve seat grinding and clamping device differs from the first embodiment in that: in the embodiment, the clamping mechanisms are all provided with detection mechanisms, the detection mechanisms all comprise a pressure sensor 17 and a torque sensor 27, the pressure sensor 17 is arranged on the clamping mechanism base 11, the pressure sensor 17 is fixedly connected with a bearing cover III18 on the clamping mechanism base 11 through bolts in the embodiment, and the spring 10 is in a natural state, the top end of the pressure sensor 17 is spaced from the top end of the spring seat 6, when the spring 10 is compressed, the top end of the pressure sensor 17 can be abutted against the flange at the top end of the spring seat 6, the pressure sensor 17 is electrically connected with a numerical control display screen, when the clamping mechanism is moved to ensure that the valve seat 1 is attached to the ball core, the top end of the pressure sensor 17 is contacted with the top end of the spring seat 6, the pressure value is transmitted to the numerical control display screen, by moving the upper and lower clamping mechanisms, the pressure values displayed by the two pressure sensors 17 reach the required pressure, and then the clamping mechanisms can be stopped moving.

The specific implementation process is as follows: when the valve seat 1 is attached to the surface of the ball core, the valve seat 1 transmits pressure to the transmission shaft 21 through the self-centering chuck 2, the chuck seat 3 and the universal coupling 5, the transmission shaft 21 in the clamping mechanism above moves backwards through the rectangular hole of the rectangular linear bearing 20, the spring seat 6 fixedly connected with the transmission shaft 21 moves backwards at the same time, the spring 10 is compressed at the moment, the pressure sensor 17 abuts against the spring seat 6 to enable the pressure sensor 17 to be pressed, the pressure sensor 17 outputs pressure after being pressed, and when the pressure is the same as the set pre-pressure, the motor 25 stops rotating, and the clamping mechanism does not move any more.

The torque sensor 27 is installed on the power unit, in this embodiment, the torque sensor 27 is installed between the motor 25 and the belt pulley II28, the torque sensor 27 is electrically connected with a numerical control display screen, and after the motor 25 rotates, the torque value is transmitted to the numerical control display screen to detect the torque of the two clamping mechanisms in grinding in real time.

The above description is only an example of the present invention, and the detailed technical solutions and/or characteristics known in the solutions are not described too much here. It should be noted that, for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.

Claims

1. Disk seat grinds clamping device, including being located coplanar and vertical just to two fixture that set up, its characterized in that: the clamping mechanisms comprise flexible clamping units and axial force transmission units, each axial force transmission unit comprises a clamping mechanism base, a valve seat transmission main shaft, a transmission shaft and a power unit, the valve seat transmission main shaft is rotatably connected with the clamping mechanism base, a mounting hole is formed in the valve seat transmission main shaft, a rectangular linear bearing with a rectangular inner hole is mounted in the mounting hole, the cross section of the transmission shaft is rectangular, the transmission shaft penetrates through the rectangular hole of the rectangular linear bearing, and the power unit drives the valve seat transmission main shaft to rotate; the flexible clamping unit comprises a chuck seat and a grinding tool, the grinding tool is fixedly connected with the chuck seat, a universal coupling is connected between the transmission shaft and the chuck seat, and a pre-pressure generating unit is arranged between the flexible clamping unit and the axial force transmission unit.

2. The valve seat grinding fixture of claim 1 wherein: the pre-pressure generating unit comprises a spring seat and a spring, the spring seat is rotatably connected with the transmission shaft, and the spring is located between the spring seat and the clamping mechanism base.

3. The valve seat grinding fixture of claim 2 wherein: and the spring seat is fixedly connected with a limiting ring.

4. The valve seat grinding fixture of claim 2 wherein: the two ends of the valve seat transmission main shaft are respectively and rotatably connected with the clamping mechanism base through bearings, and the upper end and the lower end of the clamping mechanism base are respectively and fixedly connected with a bearing cover III and a bearing cover II.

5. The valve seat grinding fixture of claim 4 wherein: the spring holder includes uide bushing and the connecting plate of coaxial setting, the external diameter of connecting plate is greater than the external diameter of uide bushing, the both ends of spring are connected with the uide bushing of bearing cap III and spring holder respectively.

6. The valve seat grinding fixture of claim 1 wherein: sliding holes are formed in two sides of the valve seat transmission main shaft, an anti-dropping pin is fixedly connected to the transmission shaft vertically, and two ends of the anti-dropping pin are located in the two sliding holes and are in vertical sliding fit with the sliding holes respectively.

7. The valve seat grinding fixture of claim 1 wherein: the power unit comprises a motor and a belt pulley set, the belt pulley set comprises a belt pulley I, a belt pulley II and a belt, the belt pulley I is fixedly connected with the valve seat transmission main shaft, the belt pulley II is fixedly connected with an output shaft of the motor, and the belt is located between the belt pulley I and the belt pulley II.

8. The valve seat grinding fixture of claim 7 wherein: the motor is a variable frequency motor.

9. The valve seat grinding fixture of claim 1 wherein: the mounting hole includes coaxial mutual intercommunication's wide hole and slot, the diameter in wide hole is greater than the diameter in slot, rectangle linear bearing be located in the wide hole and with wide hole interference fit.

10. The valve seat grinding fixture of claim 2 wherein: all be equipped with detection mechanism on the fixture, detection mechanism all includes the torque sensor who is used for detecting the moment of torsion when disk seat grinds with the pressure sensor of the pressure value when the ball core grinds and is used for detecting the disk seat and grinds, pressure sensor installs on the fixture base, and pressure sensor's top can with the spring holder offsets, torque sensor installs on power pack.