Valve cone grinding machine

Abstract

The invention discloses a valve fine cone surface grinding machine, comprising a bed, a workpiece spindle assembly, a grinding wheel shaft assembly, and a dressing shaft assembly. An online dynamic balancing device is provided in the grinding wheel shaft assembly, an acoustic wave monitoring device is provided in the dressing shaft assembly, a valve auxiliary support device is provided on one side of the workpiece spindle assembly on the bed and is opposite to the grinding wheel shaft assembly, a valve positioning device equipped with a universal positioning head is provided at a position opposite to the workpiece spindle assembly, a grinding fluid nozzle connected to a grinding fluid booster pump is provided at a position opposite to the valve grinding part, and a fire extinguishing device is provided on the bed, the fire extinguishing device comprises a temperature sensing sensor and a fire extinguishing nozzle whose installation position is opposite to the valve grinding part. The valve fine cone surface grinding machine adopting the invention can maintain the dynamic balancing accuracy of the grinding wheel shaft for a long time, automatically monitor the grinding wheel dressing quality, improve the valve positioning accuracy, reduce the bending deformation of the valve during the grinding process, and has high grinding efficiency and is safe and reliable to use.

Description

Technical Field

[0001] The invention relates to a grinding machine, in particular to a special grinding machine for valves used for high-precision grinding of conical surfaces of high-temperature nickel-based alloy valves. Background Art

[0002] The valve is an important part of the engine. With more stringent emission requirements, in order to reduce emissions and improve the thermal efficiency of the engine, the base material used for the valve has been gradually replaced by nickel-based alloy base material from the original ordinary martensitic steel and austenitic steel. Ordinary abrasives no longer have the ability to process high-temperature nickel-based alloy materials. Therefore, ceramic CBN abrasives were developed to cope with the grinding of nickel-based alloy materials. The grinding of the valve cone is a key process in valve processing. During the grinding of the valve cone, the valve is clamped in the workpiece spindle, and the grinding wheel used to grind the valve is installed on the rotating grinding wheel shaft. The high-speed rotating grinding wheel shaft must be dynamically balanced to ensure the stability of the operation process. Due to factors such as wear during the use of the grinding wheel, the balance accuracy of the grinding wheel shaft is difficult to maintain continuously, and its operation stability will be difficult to ensure. This brings an unstable hidden danger to the grinding quality of the valve precision cone grinder. In order to ensure the grinding quality, the grinding wheel shaft assembly needs to be dynamically balanced frequently. On the one hand, this will affect the working efficiency of the grinder, and on the other hand, it will affect when it is needed. It is also difficult to accurately master the dynamic balancing operation; for the grinding wheel spindle using an electric spindle, the stability and reliability of the grinding wheel electric spindle installation is also a factor affecting the grinding quality. Usually the grinding wheel electric spindle is installed on the grinding wheel electric spindle mounting seat, and its installation accuracy is guaranteed by the matching accuracy of the grinding wheel electric spindle housing and the electric spindle mounting hole on the grinding wheel electric spindle mounting seat. There is always a matching gap between the grinding wheel electric spindle housing and the electric spindle mounting hole. Such a gap will cause the grinding wheel electric spindle to be in an unstable position. For high-precision valve grinders, this is also one of the factors affecting the operating accuracy of the grinding wheel spindle.

[0003] The precise dressing of the grinding wheel is the premise to ensure the grinding quality. The dressing process of the grinding wheel is carried out by the relative movement between the grinding wheel dresser and the grinding wheel. In the precision valve grinder, the grinding wheel dresser mostly adopts a rotating grinding wheel dressing disc, which is installed on the dressing electric spindle. The rotating grinding wheel dressing disc is used to dress the grinding working surface of the rotating grinding wheel. Usually, the dressing process and dressing quality of the grinding wheel are determined by manual observation, which requires the operator to have certain experience, and the dressing quality of the grinding wheel cannot be guaranteed accordingly. Such a method is unacceptable for high-precision valve grinders; in addition, the dressing electric spindle used to drive the grinding wheel dressing disc is installed on the dressing electric spindle mounting seat, and its installation accuracy is guaranteed by the matching accuracy of the dressing electric spindle housing and the electric spindle mounting hole on the dressing electric spindle mounting seat. There is always a matching gap between the dressing electric spindle housing and the electric spindle mounting hole. Such a gap will cause the dressing electric spindle to be in an unstable position. For high-precision valve grinders, this is also one of the factors that affect the grinding wheel dressing quality and then the grinding quality.

[0004] During the grinding process of the valve cone surface, the grinding force of the grinding wheel on the valve will form components along the radial and axial directions of the valve. The radial component will cause the valve to bend and deform during the grinding process, while the axial component will cause the valve to have a tendency to have a large end face runout during the grinding process. This will have a great impact on the grinding quality. To eliminate this impact, reducing the grinding force by reducing the grinding amount during the grinding process is a feasible solution, but this will greatly reduce the production efficiency of the grinding process.

[0005] During the grinding process, a large amount of grinding chips will be generated. If they are not cleaned in time, the grinding chips will adhere to the grinding working surface of the grinding wheel, reducing the grinding efficiency and increasing the temperature of the grinding area. The ordinary grinding process uses grinding fluid to remove the grinding chips and cool the grinding area. However, for valves made of nickel-based high-temperature alloy materials, serious adhesion will occur during the grinding process of nickel-based high-temperature alloys, making grinding extremely difficult and making it difficult to ensure the grinding quality. In addition, the grinding wheel will suffer serious wear and tear, and the temperature of the grinding area will be higher. Once the grinding fluid is not supplied in time, there is even the possibility of a fire.

[0006] In addition, when the workpiece spindle clamps the valve before grinding, the valve clamping position must be accurately positioned to ensure the positional dimensional accuracy of the valve cone surface after processing. The large end face of the valve is a commonly used positioning reference surface in valve processing, but the surface shape and positional accuracy of the end face of the large end of the valve are not high. Using this surface as the positioning reference surface may often cause positioning errors and affect the positional dimensional accuracy of the valve grinding process. If the manufacturing accuracy of the large end face of the valve is improved in the previous process, although the positioning requirements during valve grinding can be guaranteed, this will inevitably increase the manufacturing cost. Summary of the invention

[0007] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a valve precision cone surface grinder, which can maintain the dynamic balance accuracy of the grinding wheel shaft for a long time, automatically monitor the grinding wheel dressing quality, improve the valve positioning accuracy, reduce the bending deformation of the valve during the grinding process, and has high grinding efficiency and is safe and reliable to use.

[0008] In order to solve the above technical problems, a valve precision taper grinding machine of the present invention comprises a bed, a workpiece spindle assembly, a grinding wheel shaft assembly and a dressing shaft assembly installed on the bed, the grinding wheel shaft in the grinding wheel shaft assembly is integrated with the rotor of the grinding wheel electric spindle and is rotatably supported on the grinding wheel electric spindle housing through bearings, a grinding wheel mounting flange is installed at the front end of the grinding wheel shaft, the grinding wheel shaft is a hollow shaft, a balancing head is fixedly connected to the inner hole at the front end of the grinding wheel shaft, the installation position of the balancing head corresponds to the position of the grinding wheel mounting flange, and the balancing head is located on the outside of the bearing supporting the grinding wheel shaft, the rear end of the grinding wheel shaft passes through the grinding wheel electric spindle housing, a signal receiver is installed at the rear end of the grinding wheel shaft, the signal receiver is electrically connected to the balancing head through a signal data line passing through the inner hole of the grinding wheel shaft, a receiver shield is fixedly connected to the rear end of the grinding wheel electric spindle housing, a signal transmitter is fixedly connected in the receiver shield, and the signal transmitter is connected to the signal receiver through a wireless signal. A vibration sensor is installed on the grinding wheel electric spindle; the grinding wheel electric spindle housing is fixedly connected to the grinding wheel electric spindle seat, a clamping groove is axially opened on one side wall of the grinding wheel electric spindle mounting hole on the grinding wheel electric spindle seat, and the hole walls on both sides of the clamping groove are fastened and connected by clamping screws; the grinding wheel electric spindle seat is fixedly connected to the upper slide, and the upper slide is slidably supported on the upper slide seat through a feed linear guide pair, a feed drive device is provided between the upper slide and the upper slide seat, and a feed drive device is provided between the upper slide and the upper slide A grating ruler is also provided between the seats, the upper slide seat is fixedly connected to the lower slide, the lower slide is slidably supported on the grinding wheel frame base through a tool feed linear guide pair, a tool feed drive device is provided between the lower slide and the grinding wheel frame base, the length direction of the guide rail in the tool feed linear guide pair and the length direction of the guide rail in the feed linear guide pair intersect in space; the grinding wheel frame base is adjustably fixedly connected to the bed, and a position adjustment device is provided between the grinding wheel frame base and the bed to enable the grinding wheel frame base to rotate in the vertical direction;

[0009] The dressing shaft assembly includes a grinding wheel dressing shaft and a dressing disc mounting flange installed at the front end of the grinding wheel dressing shaft for mounting a grinding wheel dressing disc. The grinding wheel dressing shaft is integrated with the rotor of the dressing electric spindle and is rotatably supported on the housing of the dressing electric spindle through a bearing. The grinding wheel dressing shaft is a hollow shaft. An acoustic wave sensor is provided in the inner hole of the dressing disc mounting flange at the front end of the grinding wheel dressing shaft. A signal transmitter is installed in the inner hole at the rear end of the grinding wheel dressing shaft. The signal transmitter is connected to the acoustic wave sensor through a connector passing through the inner hole of the grinding wheel dressing shaft. The electric spindle is connected with the dressing motor by plugging, and a rear cover is installed at the rear end of the housing of the dressing motor spindle, and a signal transmitter is installed in the rear cover, and the signal transmitter is connected with the signal transmitter through a wireless signal; the dressing motor spindle is fixedly connected to the dressing support through the dressing motor spindle seat, and a clamping notch is axially opened on one side of the hole wall of the dressing motor spindle mounting hole on the dressing motor spindle seat, and the hole walls on both sides of the clamping notch are clamped and connected by fastening screws, and the dressing support is fixedly connected to the grinding wheel frame base; the axis of the grinding wheel dressing shaft is parallel to the length direction of the guide rail in the tool feeding linear guide pair;

[0010] A valve auxiliary support device is fixedly connected to the bed, and the valve auxiliary support device includes a support base, a slide seat is supported on the support base in a transverse sliding manner, a support driving device is provided between the slide seat and the support base, a longitudinal adjustment seat is supported on the slide seat, a transverse adjustment seat is supported on the longitudinal adjustment seat, and two upper and lower auxiliary support members are fixedly connected to the transverse adjustment seat in a vertical direction, the two auxiliary support members are located on one side of the valve to be ground and are arranged opposite to the grinding wheel, the extended end of the auxiliary support member is an arc surface support part, and the two arc surface support parts are symmetrically distributed up and down relative to the radial component force direction of the grinding force applied to the valve;

[0011] A valve positioning device is fixedly connected to the bed, and the valve positioning device includes a positioning drive cylinder, a positioning sleeve is installed at the extended end of the piston rod of the positioning drive cylinder, the axis of the positioning sleeve is located on the axis of the workpiece spindle, a ball head support hole is provided at the front end of the positioning sleeve, a positioning piece is inserted in the ball head support hole, and the positioning piece is movably inserted in the ball head support hole through the ball head at the rear end, a positioning plate is provided at the front end of the positioning piece, and a positioning convex block is provided at the outer end of the positioning plate, and the positioning convex blocks are evenly distributed on the outer end surface of the positioning plate along the circumferential direction, an O-type elastic ring is installed on the hole wall of the ball head support hole, the ball head of the positioning piece is located on the inner side of the O-type elastic ring, and the outer surface of the ball head fits with the O-type elastic ring;

[0012] A grinding fluid nozzle is installed on the bed, opposite to the valve grinding position, and the grinding fluid nozzle is connected to the grinding fluid booster pump;

[0013] A fire extinguishing device is arranged on the bed, and the fire extinguishing device comprises a temperature sensing sensor and a fire extinguishing nozzle. The installation positions of the temperature sensing sensor and the fire extinguishing nozzle are opposite to the valve grinding position.

[0014] In the above structure, since the grinding wheel shaft in the grinding wheel shaft assembly is integrated with the rotor of the grinding wheel electric spindle and is rotatably supported on the grinding wheel electric spindle housing through bearings, a grinding wheel mounting flange is installed at the front end of the grinding wheel shaft, the grinding wheel shaft is a hollow shaft, a balancing head is fixedly connected to the inner hole at the front end of the grinding wheel shaft, the installation position of the balancing head corresponds to the position of the grinding wheel mounting flange, and the balancing head is located on the outside of the bearing supporting the grinding wheel shaft, the rear end of the grinding wheel shaft passes through the grinding wheel electric spindle housing, a signal receiver is installed at the rear end of the grinding wheel shaft, the signal receiver is electrically connected to the balancing head through a signal data line passing through the inner hole of the grinding wheel shaft, a receiver shield is fixedly connected to the rear end of the grinding wheel electric spindle housing, a signal transmitter is fixedly connected to the receiver shield, and the signal transmitter communicates with the signal transmitter via wireless signals. The electric spindle is connected to a signal receiver, a vibration sensor is installed on the grinding wheel electric spindle, the grinding wheel electric spindle housing is fixedly connected to the grinding wheel electric spindle seat, a clamping groove is axially opened on one side wall of the grinding wheel electric spindle mounting hole on the grinding wheel electric spindle seat, and the hole walls on both sides of the clamping groove are fastened and connected by clamping screws, then the grinding wheel shaft as a part of the grinding wheel electric spindle is directly driven by electricity, and the balancing head fixedly connected to the inner hole at the front end of the grinding wheel shaft can perform online dynamic balancing on the grinding wheel shaft as the electric spindle rotor at any time. When the grinding wheel shaft vibrates due to imbalance during its rotation, the vibration sensor will timely detect the vibration signal generated by the imbalance of the grinding wheel shaft and transmit it to the control system of the grinder through cables, and the control system will obtain control instructions for the balancing head after analysis, and the balancing The control command of the balancing head is transmitted by the control system through cables to the signal transmitter fixed on the receiver shield, and then the control command is sent to the signal receiver rotating with the grinding wheel shaft through wireless signals. The signal receiver transmits the signal to the balancing head through the signal data line, thereby ensuring that the balancing head in rotation can smoothly receive the control command. The balancing head immediately compensates for the imbalance according to the control command until the grinding wheel shaft is in a balanced state and runs stably, and can maintain the dynamic balancing accuracy of the grinding wheel shaft for a long time. The installation position of the balancing head corresponds to the installation position of the grinding wheel mounting flange, which can optimize the balance state of the grinding wheel, so that the grinding wheel shaft is always in a dynamic balance state and runs stably, so that high-precision grinding quality requirements can be achieved. Guarantee: the size of the grinding wheel electric spindle mounting hole on the grinding wheel electric spindle seat can be processed to the accuracy of gap-free fit with the grinding wheel electric spindle casing. Thereafter, a clamping groove is axially opened on the hole wall on one side of the grinding wheel electric spindle mounting hole so that the grinding wheel electric spindle mounting hole can be opened along the clamping groove, which is convenient for the smooth insertion and installation of the grinding wheel electric spindle. The installation process will not generate resistance to insertion and assembly due to the gap-free fit between the grinding wheel electric spindle mounting hole and the grinding wheel electric spindle casing, and the grinding wheel electric spindle will not be damaged. After successful installation, the grinding wheel electric spindle casing is clamped and fixedly connected with the hole wall of the grinding wheel electric spindle mounting hole by the clamping screw. There is no fit gap between the grinding wheel electric spindle mounting hole and the grinding wheel electric spindle casing, and the fit accuracy is high, which ensures the stability and reliability of the grinding wheel electric spindle installation.

[0015] The electric spindle seat of the grinding wheel is fixedly connected to the upper slide, the upper slide is slidably supported on the upper slide seat by a feed linear guide pair, a feed driving device is provided between the upper slide and the upper slide seat, a grating ruler is also provided between the upper slide and the upper slide seat, the upper slide seat is fixedly connected to the lower slide, the lower slide is slidably supported on the grinding wheel frame base by a tool feeding linear guide pair, a tool feeding driving device is provided between the lower slide and the grinding wheel frame base, the length direction of the guide rail in the tool feeding linear guide pair and the length direction of the guide rail in the feed linear guide pair spatially intersect, the grinding wheel frame base is adjustably fixedly connected to the bed, and a position adjusting device that can make the grinding wheel frame base rotate in the vertical direction is provided between the grinding wheel frame base and the bed. The grating ruler arranged between the slide and the upper slide seat can accurately detect the feed amount of the upper slide to ensure the grinding accuracy of the valve cone surface. The length direction of the guide rail in the tool feed linear guide pair and the length direction of the guide rail in the feed linear guide pair intersect in space so that the feeding direction of the grinding wheel and the tool feed direction form an appropriate angle, and the angle can correspond to the cone angle of the valve cone surface and the angle between the generatrix of the grinding wheel grinding surface and the grinding wheel axis, so as to better meet the grinding requirements of the valve cone surface. The grinding wheel frame base is adjustably fixed to the bed through a position adjustment device so that the grinding wheel frame base and components such as the grinding wheel spindle supported thereon can be rotated to change the installation position, so as to better facilitate the grinding of various valves with different cone angles.

[0016] Furthermore, since the dressing shaft assembly includes a grinding wheel dressing shaft and a dressing disc mounting flange installed at the front end of the grinding wheel dressing shaft for mounting a grinding wheel dressing disc, the grinding wheel dressing shaft and the rotor of the dressing electric spindle are integrated and rotatably supported on the housing of the dressing electric spindle through bearings, the grinding wheel dressing shaft is a hollow shaft, an acoustic wave sensor is provided in the inner hole at the dressing disc mounting flange at the front end of the grinding wheel dressing shaft, a signal transmitter is installed in the inner hole at the rear end of the grinding wheel dressing shaft, the signal transmitter is plugged into the acoustic wave sensor through a connector passing through the inner hole of the grinding wheel dressing shaft, and the signal transmitter is connected to the acoustic wave sensor through a connector passing through the inner hole of the grinding wheel dressing shaft. A rear cover is installed at the rear end of the casing, and a signal transmitter is installed in the rear cover. The signal transmitter is connected to the signal transmitter through a wireless signal. The dressing electric spindle is fixedly connected to the dressing support through the dressing electric spindle seat. A clamping notch is axially opened on one side of the hole wall of the dressing electric spindle mounting hole on the dressing electric spindle seat. The hole walls on both sides of the clamping notch are clamped and connected by fastening screws. The dressing support is fixedly connected to the grinding wheel frame base. The axis of the grinding wheel dressing shaft is parallel to the length direction of the guide rail in the tool feeding linear guide pair. The grinding wheel dressing shaft is directly driven by electricity as a part of the dressing electric spindle. The acoustic wave sensor installed in the inner hole of the dressing disc mounting flange at the front end of the grinding wheel dressing shaft can sense the acoustic wave signal of the grinding wheel dressing disc at any time during its operation. Different acoustic wave signals will be sensed when the grinding wheel dressing disc is running idle and when it is working during the dressing process. In addition, different acoustic wave signals will be sensed when the working surface of the grinding wheel is uneven at the initial stage of dressing and when it is flat after dressing. The sensed acoustic wave signal is transmitted to the signal transmitter that rotates with the grinding wheel dressing shaft together with the acoustic wave sensor through the connector, and then The signal transmitter transmits the signal to the signal transmitter fixed on the back cover by wireless transmission, and the signal transmitter transmits the signal to the control system of the grinder through cables, thereby ensuring that the acoustic wave sensor in rotation can smoothly transmit the sensed acoustic wave signal to the control system of the grinder. According to the obtained acoustic wave signal, the control system of the grinder can accurately grasp the dressing process of the grinding wheel, and terminate the grinding wheel dressing work in time after obtaining the acoustic wave signal after the working surface of the grinding wheel is dressed and leveled. The degree of automation is high, the quality of grinding wheel dressing is guaranteed, and the work efficiency is also improved. The size of the trimming electric spindle mounting hole on the trimming electric spindle seat can be processed to the accuracy of gap-free fit with the trimming electric spindle housing. Thereafter, a clamping notch is opened axially on the hole wall on one side of the trimming electric spindle mounting hole so that the trimming electric spindle mounting hole can be opened along the clamping notch, thereby facilitating the smooth insertion and installation of the trimming electric spindle. The installation process will not generate resistance to insertion assembly due to the gap-free fit between the trimming electric spindle mounting hole and the trimming electric spindle housing. After successful installation, the hole wall of the trimming electric spindle mounting hole is tightened and connected to the trimming electric spindle housing by tightening screws. There is no fit gap between the trimming electric spindle mounting hole and the trimming electric spindle housing, and the fit accuracy is high, thereby ensuring the stability and reliability of the installation of the trimming electric spindle.

[0017] Furthermore, since a valve auxiliary support device is fixedly connected to the bed, the valve auxiliary support device includes a support base, a slide seat is supported on the support base in a transverse sliding manner, a support driving device is provided between the slide seat and the support base, a longitudinal adjustment seat is supported on the slide seat, a transverse adjustment seat is supported on the longitudinal adjustment seat, and upper and lower auxiliary support members are fixedly connected to the transverse adjustment seat in a vertical direction, the two auxiliary support members are located on one side of the valve to be ground and are arranged opposite to the grinding wheel, the outwardly extending end of the auxiliary support member is an arc surface support portion, and the two arc surface support portions are radially spaced relative to the grinding force applied to the valve The force direction is symmetrically distributed up and down, and the valve auxiliary support device is driven by the support driving device to automatically enter the support position to support the valve in the grinding process. The support component moves in the horizontal direction (i.e., the radial direction of the main axis of the grinder workpiece) through the slide seat to enter or exit the support position, with fast action and high efficiency; the support component can accurately adjust its position through the longitudinal adjustment seat and the transverse adjustment seat to ensure that the support component can maintain good contact with the supported valve when entering the support position to prevent the cutting force during grinding from causing bending deformation to the valve, and will not cause excessive push on the valve The supporting components are upper and lower auxiliary supporting parts fixedly connected in the vertical direction on the lateral adjustment seat. The two auxiliary supporting parts are used to assist the valve in the grinding process. The supporting stability is high. The two auxiliary supporting parts are arranged up and down in the vertical direction. The arcuate supporting parts of the two auxiliary supporting parts are symmetrically distributed up and down opposite to the radial component of the grinding force. The arcuate supporting surface can ensure good contact with the ground conical surface of the valve and a small contact point. The contact part between the arcuate supporting part and the valve is the ground conical surface of the valve. Under the drive of the supporting driving device, the two arcuate supporting parts maintain contact with the ground conical surface. The radial component of the supporting thrust generated by the supporting thrust is opposite to the radial component of the grinding force of the grinding wheel. After the grinding allowance of the valve cone is ground, the grinding force is reduced accordingly. At this time, the two arc surface supporting parts also reach the end position of the stroke under the drive of the supporting drive device. The two arc surface supporting parts only maintain contact with the valve cone surface and will not generate excessive supporting thrust, thereby avoiding or reducing the bending deformation of the valve that may be caused by the grinding force, improving the grinding quality, and avoiding the reduction in production efficiency caused by reducing the cutting amount in order to reduce friction.

[0018] Furthermore, since a valve positioning device is fixedly connected to the bed, the valve positioning device includes a positioning drive cylinder, a positioning sleeve is installed at the extended end of the piston rod of the positioning drive cylinder, the axis of the positioning sleeve is located on the axis of the workpiece spindle, a ball head support hole is provided at the front end of the positioning sleeve, a positioning piece is inserted in the ball head support hole, and the positioning piece is movably inserted in the ball head support hole through the ball head at the rear end, a positioning plate is provided at the front end of the positioning piece, and a positioning convex block is provided at the outer end of the positioning plate, and the positioning convex blocks are evenly distributed on the outer end surface of the positioning plate along the circumferential direction, an O-type elastic ring is installed on the hole wall of the ball head support hole, the ball head of the positioning piece is located on the inner side of the O-type elastic ring, and the outer surface of the ball head fits with the O-type elastic ring, so the positioning piece is inserted through the ball head In the ball head supporting hole of the locating sleeve, the ball head and the ball head supporting hole are connected like a ball joint, and the locating piece can change its position 360 degrees around the axis of the locating sleeve within a certain range, thereby adapting to the positioning requirements when the valve end face position accuracy is not high, and ensuring the positioning accuracy; the locating plate at the front end of the locating piece is in positioning contact with the valve end face through the locating protrusion, reducing the contact area between the locating plate and the valve end face, thereby adapting to the positioning requirements when the valve end face shape accuracy is not high, playing a good positioning role, and ensuring the positioning accuracy; the provided O-ring can limit the locating piece to prevent the locating piece from slipping out of the ball head supporting hole, and at the same time does not affect the movable connection between the locating piece and the ball head supporting hole.

[0019] Moreover, a grinding fluid nozzle is installed on the bed body opposite to the valve grinding part, and the grinding fluid nozzle is connected to the grinding fluid booster pump. A fire extinguishing device is provided on the bed body, and the fire extinguishing device includes a temperature sensing sensor and a fire extinguishing nozzle. The installation positions of the temperature sensing sensor and the fire extinguishing nozzle are opposite to the valve grinding part. Then, during the grinding process, the grinding fluid is pressurized by the grinding fluid booster pump and then ejected from the grinding fluid nozzle at high pressure, which can have a strong flushing effect on the grinding chips generated by the grinding. On the one hand, the adhesion of the grinding chips to the grinding wheel can be cleaned in time, the sharpness of the grinding wheel can be kept, and the grinding efficiency can be guaranteed. On the other hand, the heat generated in the grinding area can be better taken away. The fire extinguishing device can greatly improve the safety performance of the grinding machine. In the extreme case of a failure in the grinding fluid supply system, once the temperature in the grinding area is too high or even burns and exceeds the range set by the temperature sensing sensor, the fire extinguishing device will automatically start to automatically extinguish the fire in the grinding area, thereby ensuring the safety of the grinding machine.

[0020] In summary, the use of this technical solution can maintain the dynamic balance accuracy of the grinding wheel shaft for a long time, automatically monitor the quality of grinding wheel dressing, improve the valve positioning accuracy, reduce the bending deformation of the valve during the grinding process, and has high grinding efficiency and is safe and reliable to use.

[0021] In a preferred embodiment of the present invention, the guide rail of the feed linear guide pair is installed at the bottom of the upper slide, the slider of the feed linear guide pair is installed on the upper slide seat, and the feed drive device is a ball screw nut pair driven by a servo motor. With this embodiment, the guide rail of the feed linear guide pair is under the protection of the upper slide, which can greatly reduce the damage to the feed linear guide pair caused by dirt such as dust and impurities adhering to the guide rail, and also reduce the workload of maintenance, and the upper slide has high movement accuracy and sensitive action.

[0022] In another preferred embodiment of the present invention, the guide rail of the tool linear guide pair is installed at the bottom of the slide table, the slider of the tool linear guide pair is installed on the base of the grinding wheel frame, and the tool driving device is a ball screw nut pair driven by a servo motor. With this embodiment, the guide rail of the tool linear guide pair is under the protection of the slide table, which can greatly reduce the damage to the linear guide pair caused by dust and impurities adhering to the guide rail, and also reduce the workload of maintenance. In addition, the lower slide table has high movement accuracy and sensitive action.

[0023] In another preferred embodiment of the present invention, the angle between the guide rails in the tool feed linear guide pair and the guide rails in the feed linear guide pair projected on the horizontal plane is between 60° and 90°. This embodiment can well meet the grinding requirements of conventional valve cone surfaces with different cone angles.

[0024] In a further preferred embodiment of the present invention, a circular track is provided on the bed, the grinding wheel frame base is fixedly connected to the bed through the circular track, and the position adjustment device includes gear teeth provided on the outer ring of the grinding wheel frame base, and the gear teeth are connected to the adjustment hand wheel. With this embodiment, the grinding wheel frame base can be easily rotated in the vertical direction to adjust the installation position, and the position adjustment is convenient.

[0025] Another further preferred embodiment of the present invention is that the balancing head is a motor-driven mechanical balancing head, the installation position of the signal transmitter is opposite to the installation position of the signal receiver, the spacing T between the signal transmitter and the signal receiver is 0.5 to 2 mm, and the vibration sensor is installed on the grinding wheel electric spindle housing. With this embodiment, two balancing blocks are arranged in the balancing head, and the balancing blocks are driven by the balancing motor in the balancing head. The power of the balancing motor is transmitted to the signal receiver through the signal transmitter using wireless transmission technology, and then transmitted to the balancing motor through the wire passing through the inner hole of the grinding wheel electric spindle. The balancing motor is controlled by the control instructions transmitted through the signal transmitter and the signal receiver to operate, so that the balancing blocks are moved and adjusted to achieve dynamic balancing operations, and the accurate signal transmission between the signal transmitter and the signal receiver can be ensured.

[0026] In another further preferred embodiment of the present invention, the installation position of the signal transmitter is opposite to the installation position of the signal sender, and the distance L between the signal transmitter and the signal sender is 0.5 to 1.5 mm. With this embodiment, accurate signal transmission between the signal sender and the signal transmitter can be ensured.

[0027] In a further preferred embodiment of the present invention, a slide is slidably supported in the horizontal direction on the support base through a linear guide pair, and the support driving device is a stroke-adjustable air cylinder or oil cylinder. With this embodiment, the linear guide pair has high support accuracy and sensitive movement, which can ensure the precise transmission requirements of the auxiliary support, and the air cylinder or oil cylinder is easy to control. The supporting thrust of the driven auxiliary support on the valve can be controlled by the air pressure of the air cylinder or the oil pressure of the oil cylinder, which can ensure the support requirements for the precision grinding of the valve, and can facilitate the accurate adjustment of the stroke of the air cylinder or oil cylinder to ensure the contact state of the auxiliary support on the valve cone surface when the grinding is completed.

[0028] In another further preferred embodiment of the present invention, a ball head seat is provided at the front end of the positioning sleeve, and the ball head support hole is provided on the ball head seat. With this embodiment, the structure of the positioning sleeve can be simplified, and the ball head seat can be made of a wear-resistant material different from that of the positioning sleeve, thereby reducing the manufacturing cost of the positioning sleeve.

[0029] In another further preferred embodiment of the present invention, the ball head support hole comprises a cylindrical hole section and a conical hole section located at the bottom of the cylindrical hole section. With this embodiment, the ball head support hole has a simple structure and can meet the ball head support requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The valve precision taper grinding machine of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0031] Figure 1 It is a structural schematic diagram of a specific implementation mode of the valve precision taper grinding machine of the present invention;

[0032] Figure 2 yes Figure 1 The structure shown is a side view after removing the cover and the automatic feeding device;

[0033] Figure 3 yes Figure 1 A schematic diagram of the structure of the grinding wheel frame base, the annular track, the position adjustment device and other related parts in the structure shown;

[0034] Figure 4 yes Figure 2 A schematic diagram of the structure of the grinding wheel frame base and the related components supported by it in the structure shown;

[0035] Figure 5 yes Figure 4a top view of the structure shown;

[0036] Figure 6 yes Figure 5 A cross-sectional view along the axial direction of the grinding wheel axis in the structure shown;

[0037] Figure 7 yes Figure 5 A schematic cross-sectional view of the lower slide portion of the structure shown;

[0038] Figure 8 yes Figure 4 A schematic diagram of the structure of the grinding wheel shaft assembly in the structure shown;

[0039] Fig. 9 yes Figure 8 A schematic cross-sectional view of the structure shown along the axial direction of the grinding wheel electric spindle;

[0040] Fig.10 yes Fig. 9 The structure shown is a cross-sectional schematic diagram of the grinding wheel electric spindle seat;

[0041] Fig.11 yes Figure 4 A schematic diagram of the structure of the trimming shaft assembly in the structure shown;

[0042] Fig.12 yes Fig.11 A schematic cross-sectional view of the structure shown along the axial direction of the trimming electric spindle;

[0043] Fig.13 yes Fig.12 The structure shown is a cross-sectional schematic diagram of the electric spindle seat being trimmed;

[0044] Fig.14 yes Figure 1 A schematic diagram of the structure of the valve auxiliary support device in the structure shown;

[0045] Fig.15 yes Fig.14 a side view of the structure shown;

[0046] Fig.16 yes Fig.15 A cross-sectional view of the AA portion of the structure shown;

[0047] Fig.17 yes Fig.14 A cross-sectional view of the support drive device portion of the structure shown along its axial direction;

[0048] Fig.18 yes Figure 1 A schematic diagram of the structure of the valve positioning device in the structure shown;

[0049] Fig.19 yes Fig.18An axial cross-sectional view of the positioning sleeve and positioning member in the structure shown.

[0050] In the figure: 1-grinding fluid booster pump, 2-automatic feeding device, 3-bed, 4-workpiece spindle assembly, 5-workpiece spindle, 6-valve auxiliary support device, 7-valve positioning device, 8-automatic discharging device, 9-fire extinguishing device, 10-wheel teeth, 11-grinding wheel frame base, 12-upper slide, 13-lower slide, 14-grinding wheel shaft assembly, 15-grinding wheel, 16-valve, 17-dressing shaft assembly, 18-grinding wheel dressing disc, 19-upper slide seat, 20-adjusting hand wheel, 21-position adjustment device, 22-annular track, 23-grating ruler, 24-feed linear guide pair, 25-feed drive device, 26-tool linear guide pair, 27-tool drive device,

[0051] 601-support drive device, 602-support base, 603-lateral position adjustment device, 604-slide seat, 605-trapezoidal guide seat, 606-connecting shaft, 607-longitudinal adjustment seat, 608-lateral adjustment seat, 609-support mounting seat, 610-auxiliary support, 611-arc support part, 612-trapezoidal guide, 613-dovetail guide, 614-long bolt hole, 615-connecting bolt, 616-linear guide pair,

[0052] 701- positioning piece, 702- positioning sleeve, 703- positioning drive cylinder, 704- positioning drive cylinder seat, 705- positioning convex block, 706- positioning plate, 707- O-type elastic ring, 708- ball head, 709- ball head support hole, 710- cylindrical hole section, 711- conical hole section, 712- ball head seat,

[0053] 1401-grinding wheel shaft, 1402-grinding wheel mounting flange, 1403-vibration sensor, 1404-grinding wheel electric spindle seat, 1405-clamping screw, 1406-clamping groove, 1407-mounting fixing hole, 1408-grinding wheel electric spindle, 1409-receiver shield, 1410-balancing head, 1411-bearing, 1412-signal data cable, 1413-grinding wheel electric spindle housing, 1414-signal receiver, 1415-signal transmitter,

[0054] 1701-dressing support, 1702-grinding wheel dressing shaft, 1703-dressing disc mounting flange, 1704-dressing electric spindle seat, 1705-fastening screws, 1706-clamping notch, 1707-dressing electric spindle, 1708-back cover, 1709-sonic wave sensor, 1710-connector, 1711-signal transmitter, 1712-signal transmitter. DETAILED DESCRIPTION

[0055] exist Figure 1 and Figure 2 In the valve precision taper grinder shown, the bed 3 is the basic supporting member of the grinder, supporting and driving the workpiece spindle assembly 4 for clamping the workpiece spindle 5 for the ground valve 16, the grinding wheel shaft assembly 14 for installing and driving the grinding wheel 15, the dressing shaft assembly 17 for installing and driving the grinding wheel dressing disc 18, the automatic feeding device 2, the automatic discharging device 8, the cover and the control system and other functional components are all supported on the bed 3, and a grinding fluid nozzle (not shown in the figure) is also installed on the bed 3 and is opposite to the valve grinding part between the valve 16 and the grinding wheel 15. The grinding fluid nozzle is connected to the grinding fluid booster pump 1, and the grinding fluid booster pump 1 is a general product purchased on the market. A fire extinguishing device 9 is also provided on the bed 3, and the fire extinguishing device 9 includes a temperature sensing sensor (not shown in the figure) and a fire extinguishing nozzle (not shown in the figure). The installation position of the temperature sensing sensor and the fire extinguishing nozzle is opposite to the valve grinding part. The fire extinguishing device 9 can adopt a general product purchased on the market or a customized product.

[0056] The grinding wheel spindle assembly 14 is located on the inner side of the workpiece spindle assembly 4, and the grinding wheel spindle assembly 14 is installed on the upper slide 12. Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, the upper slide 12 is slidably supported on the upper slide seat 19 through a feed linear guide pair 24, the guide rail of the feed linear guide pair 24 is installed at the bottom of the upper slide 12, and the slider of the feed linear guide pair 24 is installed on the upper slide seat 19. A feed drive device 25 is provided between the upper slide 12 and the upper slide seat 19, and the feed drive device 25 is preferably a ball screw nut pair driven by a servo motor; a grating ruler 23 is also provided between the upper slide 12 and the upper slide seat 19, and the upper slide seat 19 is fixedly connected to the lower slide 13, and the lower slide 13 is slidably supported on the grinding wheel frame base through a tool feed linear guide pair 26. 11, the guide rail of the tool linear guide pair 26 is installed at the bottom of the lower slide 13, the slider of the tool linear guide pair 26 is installed on the grinding wheel frame base 11, and a tool driving device 27 is provided between the lower slide 13 and the grinding wheel frame base 11. The tool driving device 27 is preferably a ball screw nut pair driven by a servo motor. The length direction of the guide rail in the tool linear guide pair 26 and the length direction of the guide rail in the feed linear guide pair 24 intersect in space. The included angle of the projection of the guide rail in the tool linear guide pair 26 and the guide rail in the feed linear guide pair 24 on the horizontal plane is preferably between 60° and 90°; Figure 3The grinding wheel frame base 11 is adjustably fixed to the bed 3, and a position adjustment device 21 is provided between the grinding wheel frame base 11 and the bed 3 to enable the grinding wheel frame base 11 to rotate in the vertical direction. As a preferred embodiment, an annular track 22 is provided on the bed 3, and the grinding wheel frame base 11 is fixed to the bed 3 through the annular track 22. A pin shaft is provided between the grinding wheel frame base 11 and the annular track 22 to enable the grinding wheel frame base 11 to rotate in the vertical direction, and the center of the annular track 22 is located on the pin shaft. The position adjustment device 21 includes gear teeth 10 provided on a cylindrical surface on the outer ring of the grinding wheel frame base 11, and the axis of the cylindrical surface is located on the axis of the pin shaft. The gear teeth 10 and the adjusting hand wheel 20 are connected by a gear transmission engaged with the gear teeth 10. Rotating the adjusting hand wheel 20 can conveniently drive the grinding wheel frame base 11 to rotate in the vertical direction, so that the grinding wheel shaft assembly 14 changes the installation angle position in the horizontal plane. After the position adjustment is completed, its position is pressed and locked by a pressure plate.

[0057] See also Fig. 9The grinding wheel shaft 1401 in the grinding wheel shaft assembly 14 is integrated with the rotor of the grinding wheel electric spindle 1408 and is rotatably supported on the grinding wheel electric spindle housing 1413 through a bearing 1411. A grinding wheel mounting flange 1402 for mounting a grinding wheel 15 is installed at the front end of the grinding wheel shaft 1401. The grinding wheel shaft 1401 is a hollow shaft. A balancing head 1410 is fixedly connected to the inner hole at the front end of the grinding wheel shaft 1401. The installation position of the balancing head 1410 corresponds to the position of the grinding wheel mounting flange 1402. The balancing head 1410 is located outside the bearing 1411 for supporting the grinding wheel shaft 1401. The rear end of the grinding wheel shaft 1401 passes through the grinding wheel electric spindle housing 1413. A signal receiver 1414 is installed at the rear end of the grinding wheel shaft 1401. The signal receiver 1414 is electrically connected to the balancing head 1410 through a signal data line 1412 passing through the inner hole of the grinding wheel shaft 1401. A receiver shield 1409 is fixedly connected to the rear end of the grinding wheel electric spindle housing 1413. There is a signal transmitter 1415, which is connected to the signal receiver 1414 through a wireless signal. A vibration sensor 1403 is installed on the grinding wheel electric spindle 1408. As a preferred embodiment, the balancing head 1410 is a motor-driven mechanical balancing head. The installation position of the signal transmitter 1415 is opposite to the installation position of the signal receiver 1414. The spacing T between the signal transmitter 1415 and the signal receiver 1414 is 0.5 to 2 mm. The vibration sensor 1403 is installed on the grinding wheel electric spindle housing 1413, and can also be installed on other parts connected to the grinding wheel electric spindle 1408. The balancing head 1410, the signal receiver 1414 and the signal transmitter 1415 can all be professional products sold by relevant companies on the market. The vibration sensor 1403 is also a market-purchased part, and the product provided by the supplier of the balancing head 1410 is preferred; the grinding wheel electric spindle housing 1413 is connected to the grinding wheel electric spindle seat 1404, see Figure 8 and Fig.10 A clamping groove 1406 is axially opened on one side wall of the grinding wheel electric spindle mounting hole on the grinding wheel electric spindle seat 1404, and the hole walls on both sides of the clamping groove 1406 are fastened and connected by clamping screws 1405, so that the grinding wheel electric spindle 1408 is fixedly connected to the grinding wheel electric spindle seat 1404 without gap. An installation fixing hole 1407 is provided at the bottom of the grinding wheel electric spindle seat 1404, and the grinding wheel electric spindle seat 1404 is fixedly connected to the upper slide 12 through the installation fixing hole 1407.

[0058] See also Fig.11 and Fig.12The dressing shaft assembly 17 includes a grinding wheel dressing shaft 1702 and a dressing disc mounting flange 1703 installed at the front end of the grinding wheel dressing shaft 1702 for mounting a grinding wheel dressing disc 18. The grinding wheel dressing shaft 1702 is integrated with the rotor of the dressing electric spindle 1707 and is rotatably supported on the housing of the dressing electric spindle 1707 through a bearing. The grinding wheel dressing shaft 1702 is a hollow shaft. An acoustic wave sensor 1709 is provided in the inner hole of the dressing disc mounting flange 1703 at the front end of the grinding wheel dressing shaft 1702. A signal transmitter 1711 is installed in the inner hole at the rear end of the grinding wheel dressing shaft 1702. The signal transmitter 1711 is plugged into the acoustic wave sensor 1709 through a connector 1710 passing through the inner hole of the grinding wheel dressing shaft 1702. A rear cover 1708 is installed at the rear end of the housing of the spindle 1707, and a signal transmitter 1712 is installed in the rear cover 1708. The signal transmitter 1712 is connected to the signal transmitter 1711 through a wireless signal. As a preferred embodiment, the installation position of the signal transmitter 1712 is opposite to the installation position of the signal transmitter 1711, and the spacing L between the signal transmitter 1712 and the signal transmitter 1711 is 0.5 to 1.5 mm. The acoustic wave sensor 1709, the connector 1710, the signal transmitter 1711 and the signal transmitter 1712 can all be selected from a set of professional products sold by relevant companies on the market; the dressing electric spindle 1707 is fixedly connected to the dressing support 1701 through the dressing electric spindle seat 1704, see Fig.13 A clamping notch 1706 is axially opened on one side wall of the dressing electric spindle mounting hole on the dressing electric spindle seat 1704, and the hole walls on both sides of the clamping notch 1706 are clamped and connected by fastening screws 1705, so that the dressing electric spindle 1707 is fixedly connected to the dressing electric spindle seat 1704 without gap, and the dressing support 1701 is fixedly connected to the grinding wheel frame base 11. The axis of the grinding wheel dressing shaft 1702 is parallel to the length direction of the guide rail in the tool feeding linear guide pair 26. During the grinding wheel dressing process, the tool feeding movement is used to complete the dressing of the entire grinding surface of the grinding wheel.

[0059] The valve auxiliary support device 6 fixedly connected to the bed 3 is located on the outside of the workpiece spindle assembly 4 and is arranged opposite to the grinding wheel shaft assembly 14. Fig.14 and Fig.15As shown, the valve auxiliary support device 6 includes a support base 602, on which a slide 604 is supported in a lateral sliding manner, the lateral direction being the radial direction of the workpiece spindle 5 on the grinding machine, a support driving device 601 is provided between the slide 604 and the support base 602, a longitudinal adjustment seat 607 is supported on the slide 604, a lateral adjustment seat 608 is supported on the longitudinal adjustment seat 607, and two upper and lower auxiliary support members 610 are fixedly connected to the lateral adjustment seat 608 in the vertical direction, the two auxiliary support members 610 are located on one side of the valve 16 to be ground and are arranged opposite to the grinding wheel 15, the extended end of the auxiliary support member 610 is an arc surface support portion 611, and the two arc surface support portions 611 are symmetrically distributed up and down relative to the radial component direction of the grinding force on the valve 16. As a preferred embodiment, see Fig.16 and Fig.17The slide 604 is supported on the support base 602 by a linear guide pair 616 along a horizontal sliding motion. The guide rail of the linear guide pair 616 is installed at the bottom of the slide 604. The slider of the linear guide pair 616 is installed on the support base 602. A longitudinal adjustment seat 607 is supported on the slide 604 by a trapezoidal guide rail 612. The trapezoidal guide rail 612 is arranged on the trapezoidal guide seat 605. The trapezoidal guide seat 605 is fixedly connected to the slide 604. The longitudinal adjustment seat 607 is supported on the trapezoidal guide seat 605 by a trapezoidal guide rail 612. A connecting shaft 606 is inserted in the longitudinal direction, and a long bolt hole 614 is provided above the connecting shaft mounting hole on the trapezoidal guide rail seat 605. The long bolt hole 614 is arranged in the longitudinal direction, and the longitudinal adjustment seat 607 is fixedly connected to the connecting shaft 606 by a connecting bolt 615 passing through the long bolt hole 614. In this way, the longitudinal adjustment seat 607 and the connecting shaft 606 can adjust the installation position in the longitudinal direction as needed and are fixedly connected to the slide seat 604 through the connecting bolt 615 and the connecting shaft 606; the supporting drive device 601 is a stroke-adjustable cylinder or oil cylinder, and the cylinder body of the cylinder is fixedly connected to the supporting base 602 The piston rod end of the cylinder is fixedly connected to the trapezoidal guide seat 605 fixedly connected to the slide seat 604 to drive the slide seat 604 to shift; a transverse adjustment seat 608 is supported on the longitudinal adjustment seat 607 through a dovetail guide rail 613, and the dovetail guide rail of the dovetail guide rail 613 is arranged at the bottom of the transverse adjustment seat 608, and the dovetail groove of the dovetail guide rail 613 is arranged on the dovetail groove seat fixedly connected to the longitudinal adjustment seat 607. Of course, it can also be directly arranged on the longitudinal adjustment seat 607. A transverse position adjustment device 603 is provided between the longitudinal adjustment seat 607 and the transverse adjustment seat 608. The position adjustment device 603 can simply adopt a screw-nut adjustment device, the nut of the screw-nut adjustment device is fixedly connected to the dovetail groove seat, and a screw support block is provided on the lateral adjustment seat 8. The screw is rotatably supported on the screw support block. In order to improve the adjustment accuracy, the screw adopts a fine thread. The position of the lateral adjustment seat 608 can be adjusted by rotating the screw. After the position adjustment is completed, the position is fixed by tightening the nut; two auxiliary support members 10 are fixedly connected to the lateral adjustment seat 608 through the support mounting seat 9, and the protruding end of the auxiliary support member 10 is an arc support portion 11 made of PCD patch.

[0060] The valve positioning device 7 fixedly connected to the bed 3 is arranged opposite to the workpiece spindle assembly 4. Fig.18 and Fig.19As shown, the valve positioning device 7 includes a positioning drive cylinder 703, and the positioning drive cylinder 703 preferably adopts a stroke-adjustable cylinder. The positioning drive cylinder 703 is installed on a positioning drive cylinder seat 704 and is installed and connected to the grinder through the positioning drive cylinder seat 704. A positioning sleeve 702 is installed at the extended end of the piston rod of the positioning drive cylinder 703. The axis of the positioning sleeve 702 is located on the axis of the workpiece spindle 5. A ball head support hole 709 is provided at the front end of the positioning sleeve 702. A positioning member 701 is inserted in the ball head support hole 709. The positioning member 701 is movably inserted in the ball head support hole 709 through the ball head 708 at the rear end. As a preferred embodiment, a ball head seat 712 is provided at the front end of the positioning sleeve 702, and the ball head The supporting hole 709 is arranged on the ball head seat 712, and the ball head supporting hole 709 includes a cylindrical hole section 710 and a conical hole section 711 located at the bottom of the cylindrical hole section 710. The spherical surface of the ball head 708 is tangent to the inner surfaces of the cylindrical hole section 710 and the conical hole section 711. An O-type elastic ring 707 is installed on the hole wall of the ball head supporting hole 709. The ball head 708 of the positioning member 701 is located on the inner side of the O-type elastic ring 707, and the outer surface of the ball head 708 fits with the O-type elastic ring 707. A positioning plate 706 is provided at the front end of the positioning member 701, and a positioning protrusion 705 is provided at the outer end of the positioning plate 706. There are usually three to five positioning protrusions 705, and each positioning protrusion 705 is evenly distributed on the outer end surface of the positioning plate 706 along the circumferential direction.

[0061] The above only lists some preferred embodiments of the present invention, but the present invention is not limited thereto, and many improvements and changes can be made. As long as the improvements and changes are made on the basis of the basic principles of the present invention, they should be regarded as falling within the protection scope of the present invention.

Claims

1. A valve taper grinding machine, comprising a bed (3), a workpiece spindle assembly (4) mounted on the bed (3) and supporting and driving a workpiece spindle (5), a grinding wheel spindle assembly (14), and a dressing spindle assembly (17), characterized in that: The grinding wheel shaft (1401) in the grinding wheel shaft assembly (14) is integrated with the rotor of the grinding wheel electric spindle (1408) and is rotatably supported on the grinding wheel electric spindle housing (1413) via a bearing (1411). A grinding wheel mounting flange (1402) is mounted at the front end of the grinding wheel shaft (1401). The grinding wheel shaft (1401) is a hollow shaft. A balancing head (1410) is fixedly connected to the inner hole at the front end of the grinding wheel shaft (1401). The mounting position of the balancing head (1410) corresponds to the position of the grinding wheel mounting flange (1402). The balancing head (1410) is located outside the bearing (1411) used for supporting the grinding wheel shaft (1401). The rear end of the grinding wheel shaft (1401) passes through the grinding wheel electric spindle housing (1413). A signal receiver (1414) is mounted at the rear end of the grinding wheel shaft (1401). The signal receiver (1414) 1414) is electrically connected to the balancing head (1410) through a signal data line (1412) inserted into the inner hole of the grinding wheel shaft (1401); a receiver shield (1409) is fixedly connected to the rear end of the grinding wheel electric spindle housing (1413); a signal transmitter (1415) is fixedly connected inside the receiver shield (1409); the signal transmitter (1415) is connected to the signal receiver (1414) via a wireless signal; a vibration sensor (1403) is installed on the grinding wheel electric spindle (1408); the grinding wheel electric spindle housing (1413) is fixedly connected to the grinding wheel electric spindle seat (1404); a clamping groove (1406) is axially opened on one side of the hole wall of the grinding wheel electric spindle mounting hole on the grinding wheel electric spindle seat (1404); the hole walls on both sides of the clamping groove (1406) are fastened and connected by clamping screws (1405); The grinding wheel electric spindle seat (1404) is fixedly connected to the upper slide (12), and the upper slide (12) is slidably supported on the upper slide seat (19) through a feed linear guide pair (24). A feed drive device (25) is provided between the upper slide (12) and the upper slide seat (19), and a grating ruler (23) is also provided between the upper slide (12) and the upper slide seat (19). The upper slide seat (19) is fixedly connected to the lower slide (13), and the lower slide (13) is slidably supported on the upper slide seat (19) through a feed linear guide pair (26). The grinding wheel frame base (11) is dynamically supported, a tool driving device (27) is provided between the lower slide (13) and the grinding wheel frame base (11), and the length direction of the guide rail in the tool feeding linear guide pair (26) and the length direction of the guide rail in the feeding linear guide pair (24) intersect in space; the grinding wheel frame base (11) is adjustably fixed to the bed (3), and a position adjustment device (21) is provided between the grinding wheel frame base (11) and the bed (3) to enable the grinding wheel frame base (11) to rotate in the vertical direction; The dressing shaft assembly (17) comprises a grinding wheel dressing shaft (1702) and a dressing disc mounting flange (1703) mounted on the front end of the grinding wheel dressing shaft (1702) for mounting a grinding wheel dressing disc. The grinding wheel dressing shaft (1702) is integrated with the rotor of the dressing electric spindle (1707) and is rotatably supported on the housing of the dressing electric spindle (1707) via a bearing. The grinding wheel dressing shaft (1702) is a hollow shaft. An acoustic wave sensor (1709) is provided in the inner hole of the dressing disc mounting flange (1703) at the front end of the grinding wheel dressing shaft (1702). A signal transmitter (1711) is installed in the inner hole of the rear end of the grinding wheel dressing shaft (1702). The signal transmitter (1711) is connected to the acoustic wave sensor (1709) via a connector (1710) passing through the inner hole of the grinding wheel dressing shaft (1702). ) are plugged in, a rear cover (1708) is installed at the rear end of the housing of the dressing electric spindle (1707), a signal transmitter (1712) is installed in the rear cover (1708), and the signal transmitter (1712) is connected to the signal transmitter (1711) through a wireless signal; the dressing electric spindle (1707) is fixedly connected to the dressing support (1701) through the dressing electric spindle seat (1704), a clamping notch (1706) is axially opened on one side of the hole wall of the dressing electric spindle installation hole on the dressing electric spindle seat (1704), the hole walls on both sides of the clamping notch (1706) are clamped and connected by fastening screws (1705), and the dressing support (1701) is fixedly connected to the grinding wheel frame base (11); the axis of the grinding wheel dressing shaft (1702) is parallel to the length direction of the guide rail in the tool feeding linear guide pair (26); A valve auxiliary support device (6) is fixedly connected to the bed (3), and the valve auxiliary support device (6) comprises a support base (602), a slide seat (604) is supported on the support base (602) in a lateral sliding manner, a support drive device (601) is provided between the slide seat (604) and the support base (602), a longitudinal adjustment seat (607) is supported on the slide seat (604), a lateral adjustment seat (608) is supported on the longitudinal adjustment seat (607), and two upper and lower auxiliary support members (610) are fixedly connected to the lateral adjustment seat (608) in a vertical direction, the two auxiliary support members (610) are located on one side of the valve to be ground and are arranged opposite to the grinding wheel (15), the extended end of the auxiliary support member (610) is a curved surface support portion (611), and the two curved surface support portions (611) are symmetrically distributed up and down relative to the radial component force direction of the grinding force applied to the valve; A valve positioning device (7) is fixedly connected to the bed (3), and the valve positioning device (7) comprises a positioning drive cylinder (703). A positioning sleeve (702) is installed at the extended end of the piston rod of the positioning drive cylinder (703). The axis of the positioning sleeve (702) is located on the axis of the workpiece spindle (5). A ball head support hole (709) is provided at the front end of the positioning sleeve (702). A positioning member (701) is inserted into the ball head support hole (709). The positioning member (701) is movably inserted into the ball head (708) at the rear end. In the ball head support hole (709), a positioning plate (706) is provided at the front end of the positioning member (701), a positioning convex block (705) is provided at the outer end of the positioning plate (706), the positioning convex blocks (705) are evenly distributed on the outer end surface of the positioning plate (706) along the circumferential direction, an O-type elastic ring (707) is installed on the hole wall of the ball head support hole (709), the ball head (708) of the positioning member (701) is located on the inner side of the O-type elastic ring (707), and the outer surface of the ball head (708) is in contact with the O-type elastic ring (707); A grinding fluid nozzle is mounted on the bed (3) and is opposite to the valve grinding portion. The grinding fluid nozzle is connected to a grinding fluid booster pump (1). A fire extinguishing device (9) is provided on the bed (3), the fire extinguishing device (9) comprising a temperature sensing sensor and a fire extinguishing nozzle, and the installation position of the temperature sensing sensor and the fire extinguishing nozzle is opposite to the valve grinding position; The guide rail of the feed linear guide pair (24) is installed at the bottom of the upper slide (12), the slider of the feed linear guide pair (24) is installed on the upper slide seat (19), and the feed drive device (25) is a ball screw nut pair driven by a servo motor; The guide rail of the tool feed linear guide pair (26) is mounted on the bottom of the lower slide platform (13), the slider of the tool feed linear guide pair (26) is mounted on the grinding wheel frame base (11), and the tool feed drive device (27) is a ball screw nut pair driven by a servo motor.

2. The valve precision taper grinding machine according to claim 1, characterized in that: The included angle between the guide rails in the tool feed linear guide pair (26) and the guide rails in the feed linear guide pair (24) projected on the horizontal plane is between 60° and 90°.

3. The valve taper grinding machine according to claim 1, characterized in that: An annular track (22) is provided on the bed (3), the grinding wheel frame base (11) is fixedly connected to the bed (3) via the annular track (22), and the position adjustment device (21) comprises gear teeth (10) provided on the outer ring of the grinding wheel frame base (11), and the gear teeth (10) are drivingly connected to the adjustment hand wheel (20).

4. The valve taper grinding machine according to claim 1, characterized in that: The balancing head (1410) is a motor-driven mechanical balancing head. The installation position of the signal transmitter (1415) is opposite to the installation position of the signal receiver (1414). The spacing T between the signal transmitter (1415) and the signal receiver (1414) is 0.5 to 2 millimeters. The vibration sensor (1403) is installed on the grinding wheel electric spindle housing (1413).

5. The valve taper grinding machine according to claim 1, characterized in that: The installation position of the signal transmitter (1712) is opposite to the installation position of the signal transmitter (1711), and the distance L between the signal transmitter (1712) and the signal transmitter (1711) is 0.5 to 1.5 millimeters.

6. The valve taper grinding machine according to claim 1, characterized in that: A slide seat (604) is slidably supported on the support base (602) in the transverse direction via a linear guide pair (616), and the support drive device (601) is a stroke-adjustable air cylinder or oil cylinder.

7. The valve taper grinding machine according to claim 1, characterized in that: A ball head seat (712) is provided at the front end of the positioning sleeve (702), and the ball head supporting hole (709) is arranged on the ball head seat (712).

8. The valve taper grinding machine according to claim 1 or 7, characterized in that: The ball head support hole (709) comprises a cylindrical hole section (710) and a conical hole section (711) located at the bottom of the cylindrical hole section (710).

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