CN116352603A

CN116352603A - Pneumatic center frame device of precision grinding machine, control method and precision grinding machine

Info

Publication number: CN116352603A
Application number: CN202310578678.7A
Authority: CN
Inventors: 曹宇中; 刘翔雄; 徐彩英; 杜海涛; 王心东; 陈军闯; 周玉娇; 李允龙; 马素芳; 李大川
Original assignee: Huachen Precision Equipment Kunshan Co ltd
Current assignee: Huachen Precision Equipment Kunshan Co ltd
Priority date: 2023-05-22
Filing date: 2023-05-22
Publication date: 2023-06-30
Anticipated expiration: 2043-05-22
Also published as: CN116352603B

Abstract

The present disclosure provides a precision grinder pneumatic center frame device, a control method and a precision grinder, wherein the precision grinder pneumatic center frame device is used for supporting a workpiece in a machining process, and comprises: the device comprises a base, a base body, a bearing mechanism, a driving mechanism, a braking mechanism and a pneumatic control system, wherein the pneumatic control system provides first pneumatic pressure and second pneumatic pressure, the driving mechanism moves through the first pneumatic pressure so as to be suitable for driving the bearing mechanism to move in the guide part along the extending direction of the guide part, and the braking part moves through the second pneumatic pressure so as to be suitable for compressing and releasing the bearing mechanism, so that the bearing mechanism is prevented and allowed to move along the extending direction of the guide part. By the present disclosure, only a small first pneumatic pressure is provided for driving the holding mechanism to move against the workpiece surface.

Description

Pneumatic center frame device of precision grinding machine, control method and precision grinding machine

Technical Field

The application relates to the field of grinding, in particular to a pneumatic center frame device of a precision grinding machine, a control method and the precision grinding machine.

Background

In the grinding process of the workpiece, particularly, when the slender workpiece is ground, for example, the excircle of the slender shaft is ground, the center frame device is arranged along the axial direction of the workpiece to support the workpiece, so that the workpiece is prevented from deforming due to the force applied by the grinding wheel and the self gravity in the grinding process, and the grinding precision is ensured. In order to realize that the support tile tightly supports against the outer surface of a workpiece, the center frame device of the grinding machine in the prior art adjusts the support tile to move towards or away from the workpiece in a manual mode, but the manual mode is complex in adjustment process, and the tight supporting force between the support tile and the surface of the workpiece is difficult to accurately control.

To overcome this problem, the prior art adopts pneumatic adjustment, however, on one hand, in order to make the supporting tile stably support the workpiece, a larger pneumatic pressure needs to be provided for the supporting tile, but most processing sites have difficulty in providing a pneumatic source with a larger pressure; on the other hand, along with the progress of the grinding process of the workpiece surface, the size of the workpiece surface is continuously reduced, so that the propping force between the support tile and the workpiece surface is changed and even separated from the workpiece surface, a technician needs to frequently adjust, and a pneumatic driving mode with larger pressure not only causes the support tile to have complicated control process, but also causes the support tile to frequently impact the workpiece surface, thereby causing the workpiece surface to be scratched and affecting the workpiece processing precision.

Disclosure of Invention

The application provides a pneumatic center frame device of a precision grinding machine, a control method and the precision grinding machine.

Specifically, the application is realized by the following technical scheme:

in a first aspect, embodiments of the present application provide a pneumatic steady rest apparatus for a precision grinder for supporting a workpiece during grinding, comprising:

a base;

a base body provided on the base and formed with a guide portion extending in a direction approaching and separating from the workpiece;

the bearing mechanism is arranged in the guide part, and one end, close to the workpiece, of the bearing mechanism is provided with a bearing part;

the driving mechanism is arranged on the base body and is connected with the bearing mechanism;

a brake mechanism disposed on the base, the brake mechanism including a brake portion;

the driving mechanism moves through first pneumatic pressure so as to be suitable for driving the bearing mechanism to move in the guide part along the extending direction of the guide part;

the braking part moves through second pneumatic pressure to be suitable for compressing and releasing the bearing mechanism, so as to prevent and allow the bearing mechanism to move along the extending direction of the guiding part;

and the pneumatic control system is used for providing the first pneumatic pressure and the second pneumatic pressure.

In some embodiments, the base body is internally provided with a cavity extending in a direction approaching and away from the workpiece, the cavity forming the guide portion.

In some embodiments, the support mechanism comprises: a moving portion provided in the guide portion and movable in the guide portion in the directions approaching and separating from the workpiece; and the bearing part is arranged at one end of the moving part, which is close to the workpiece.

In some embodiments, at least one pair of guide pairs is provided between the moving part and the guide part, the guide pairs including a sliding part, a guide part, and a rolling part provided between the sliding part and the guide part; the top or the bottom of the guide part is provided with a tight elastic part so as to be suitable for pressing the guide part against the base body through the elastic force provided by the elastic part.

In some embodiments, the drive mechanism comprises: the linear driving cylinder is arranged at one end of the base body far away from the workpiece, and is provided with an interface; the driving rod is arranged in the linear driving cylinder and extends along the extending direction of the guide part, and one end, close to the workpiece, of the driving rod penetrates through the base body and is connected with the bearing mechanism; the driving rod drives the bearing mechanism to move in the guide part along the extending direction of the guide part through the first pneumatic pressure supplied by the interface.

In some embodiments, the base is provided with an opening, and the braking mechanism further comprises: a brake base provided on the base body and covering the opening; a conductive portion disposed within the opening portion and having a cavity with the brake base; a brake part arranged in the opening part and positioned between the conducting part and the supporting mechanism; and the brake interface is arranged on the base body and communicated with the inside of the opening part, so that the pneumatic control system is suitable for providing the second pneumatic pressure into the opening part through the brake interface, and the second pneumatic pressure drives the brake part to move in the opening part through the conducting part, so that the supporting mechanism is pressed and loosened.

In some embodiments, the braking mechanism further comprises: the adjusting part is arranged in the through holes of the brake base and the conducting part in a penetrating way and is in threaded connection with the conducting part through the through holes; and a sealing part provided at the through hole opening of the conductive part to be adapted to seal the through hole of the conductive part.

In some embodiments, the pneumatic control system comprises: a pneumatic source main line provided with a pressure reducing valve; the first driving mechanism is divided into a line, one end of the first driving mechanism is connected with the pneumatic source main line, and the other end of the first driving mechanism is connected with the driving mechanism through a control valve; a second driving mechanism branch line, one end of which is connected with the pneumatic source main line, and the other end of which is connected with the driving mechanism, wherein the first driving mechanism branch line and the second driving mechanism branch line jointly provide the first pneumatic pressure; and one end of the brake mechanism is connected with the pneumatic source main line, and the other end of the brake mechanism is connected with the brake mechanism through a control valve so as to provide the second pneumatic pressure.

In a second aspect, an embodiment of the present application provides a control method for controlling the pneumatic center frame device of the precision grinder according to the first aspect, where the control method includes: providing a first pneumatic pressure to the driving mechanism through the pneumatic control system so as to be suitable for driving the bearing mechanism to move in the guide part towards the workpiece along the extending direction of the guide part, thereby reaching a workpiece propping state; maintaining said first pneumatic pressure provided, providing a second pneumatic pressure to said brake mechanism via said pneumatic control system adapted to said brake mechanism to compress said backup mechanism to maintain said hold-down condition; and after a period of processing, stopping providing the second pneumatic pressure to be suitable for loosening the bearing mechanism, so that the bearing mechanism automatically moves towards the workpiece, and the propping working state is reached again.

In a third aspect, embodiments of the present application provide a precision grinding machine, including: the pneumatic center frame device of the precision grinding machine of the first aspect.

According to various embodiments of the present disclosure, by providing a brake mechanism on a base, a gas control system is provided to provide a first pneumatic pressure to drive a support mechanism to move along the extending direction of a guide portion, and a second pneumatic pressure to drive a brake portion of the brake mechanism to move to compress and release the support mechanism, thereby preventing and allowing the support mechanism to move along the extending direction of the guide portion, so that only a small first pneumatic pressure is provided to drive the support mechanism to move to abut against the surface of a workpiece, and the support mechanism is prevented from moving by the brake mechanism during grinding processing, thereby providing sufficient support force for the support mechanism; after the size of the workpiece is reduced, the bearing mechanism is driven to repeatedly abut against the surface of the workpiece, the repeated abutting process is simple to operate, and meanwhile, the problem of damage to the surface of the workpiece due to overlarge pneumatic pressure is avoided; in addition, the driving mechanism and the braking mechanism are driven by pneumatic pressure, and the operation can be completed by only providing one set of pneumatic control system, so that the grinding machine center frame device has a simple structure.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.

FIG. 1 is a schematic diagram of a pneumatic steady rest apparatus for a precision grinding machine in accordance with one embodiment of the present disclosure;

FIG. 2 is a schematic side cross-sectional view of a pneumatic steady rest apparatus of a precision grinding machine in an embodiment of the disclosure;

FIG. 3 is a schematic cross-sectional front view of a pneumatic steady rest apparatus for a precision grinding machine in accordance with one embodiment of the present disclosure;

FIG. 4 is a schematic diagram of a pneumatic control system in an embodiment of the present disclosure;

fig. 5 is a flow chart of a control method according to an embodiment of the present disclosure.

Reference numerals:

10: a base; 11: a guide section; 12: a guide pair; 121: a sliding part; 122: a guide part; 123: a rolling part; 124: an elastic part; 13: a substrate; 14: a shield; 15: an opening portion; 151: a top plate; 152: a side plate; 153: a bottom plate; 154: an end plate;

20: a bearing mechanism; 21: a support part; 211: a support head; 212: a support bracket; 22: a moving part;

30: a driving mechanism; 31: a linear driving cylinder; 32: a driving rod; 33: a first interface; 34: and a second interface:

40: a braking mechanism; 41: a brake base; 42: a conductive portion; 43: a braking section; 44: an adjusting section; 45: a brake interface; 46: a sealing part; 47: a cover portion;

51: a pressure reducing valve; 52: a first reversing valve; 53: and a second reversing valve.

Detailed Description

The present disclosure will now be discussed with reference to several embodiments. It should be understood that these embodiments are discussed only in order to enable a person of ordinary skill in the art to better understand and thus practice the present disclosure, and are not meant to imply any limitation on the scope of the present disclosure.

As used herein, the term "comprising" and variants thereof are to be interpreted as meaning "including but not limited to" open-ended terms. The term "based on" is to be interpreted as "based at least in part on". The terms "embodiment" and "one embodiment" are to be interpreted as "at least one embodiment. The term "another embodiment" is to be interpreted as "at least one other embodiment". The terms "first," "second," and the like, may refer to different or the same object. Other explicit and implicit definitions are also possible below.

Some specific values or ranges of values may be referred to in the following description. It should be understood that these numerical values and numerical ranges are merely exemplary, which may be advantageous to put the concepts of the present disclosure into practice. However, the description of these examples is not intended to limit the scope of the present disclosure in any way. These values or ranges of values may be set otherwise, depending on the particular application and requirements.

As described above, in the prior art, the supporting shoe is adjusted to tightly prop against the outer surface of the workpiece by adopting a pneumatic mode, because a larger pneumatic pressure needs to be provided for the supporting shoe, a pneumatic source with a larger pressure is difficult to be provided for most processing sites, and in order to avoid the change of the propping force between the supporting shoe and the surface of the workpiece and even the detachment of the supporting shoe from the surface of the workpiece, a technician needs to frequently adjust the supporting shoe, and the pneumatic driving mode with a larger pressure not only makes the control process of the supporting shoe complicated, but also causes the supporting shoe to frequently strike the surface of the workpiece, thereby causing the scratch on the surface of the workpiece and affecting the processing precision of the workpiece.

Embodiments of the present disclosure address, at least in part, the above-described problems with grinding machine steady rest devices. The structure and the working principle of the grinder rest device according to an exemplary embodiment of the present disclosure will be described below with reference to fig. 1 to 5. 1-3, an exemplary structure of a grinding machine steady rest device according to one exemplary embodiment of the present disclosure is shown. As shown in fig. 1-3, generally, the grinding machine center frame device described herein includes a base 10, a support mechanism 20, a driving mechanism 30, a braking mechanism 40, and a pneumatic control system, where the base 10 serves as a carrying mechanism, and at least the driving mechanism 30 and the braking mechanism 40 are disposed on the base 10. It should be noted that, as shown in the structures of fig. 1-3, only a part of the grinding machine center frame device is shown, in fact, the grinding machine center frame device further includes a base, the base body 10 is disposed on the base, and the base body 10 is connected with the grinding machine through the base, where the center frame device and the grinding machine may be connected with each other in an unadjustable or adjustable position, for example, a guide rail pair is formed between the base and the grinding machine, and after the center frame device is adjusted in position relative to the grinding machine along the guide rail pair, the center frame device is fixedly connected with the grinding machine.

In the exemplary embodiment shown in fig. 1 to 3, the base body 10 serves as a base structure for carrying functional modules of the support mechanism 20, the drive mechanism 30, the brake mechanism 40, the pneumatic control system, etc. Illustratively, the base 10 includes a base plate 153 and a base 10 body, the base 10 body being disposed on the base plate 153 and connected to the substrate 13 through the base plate 153. The base plate 13 is exemplified by a plate shape, but may have other complex structures, so long as the base plate has enough space and strength to bear other functional structures, and the base plate 13 may be exemplified by, for example, a dovetail rail pair connected with a base of the center frame device.

In one embodiment, each grinding machine center frame device includes one set or multiple sets of base body 10, driving mechanism 30, bearing mechanism 20 and braking mechanism 40. Illustratively, the grinding machine center rest device only comprises a set of a base body 10, a driving mechanism 30, a bearing mechanism 20 and a braking mechanism 40, and the bearing mechanism 20 is abutted against the side part of the surface of the workpiece. In another example, the grinding machine center frame device comprises two sets of base bodies 10, a driving mechanism 30, a bearing mechanism 20 and a braking mechanism 40, wherein the bearing mechanism 20 is respectively abutted against the side part and the bottom part of the surface of a workpiece.

In one embodiment, the center frame device of the grinding machine is used for a grinding machine, a workpiece is an slender shaft part, after the slender shaft part is clamped by the head-tail frame device, the slender shaft part is supported and supported tightly by one or more center frame devices arranged along the axial direction of the slender shaft part to keep rotation precision, and therefore excircle grinding machining precision of the slender shaft part is guaranteed. Illustratively, the workpiece to which the grinding machine center rest device of the present disclosure is applicable may be a center-symmetrical revolving part, such as a stub shaft part, a barrel part, or the like, or a housing part, such as an engine housing, or a complex-shaped part, such as a blade, as long as it is required to provide a surface-abutting support to the workpiece during grinding processing, and the grinding machine center rest device of the present disclosure is applicable.

In one embodiment, the body of the base 10 is disposed on top of the substrate 13, and the body of the base 10 is integrally formed into a cuboid, including a top plate 151, a bottom plate 153, two side plates 152 and an end plate 154, which may be mutually spliced to form the body of the base 10, or may be integrally formed into the body of the base 10, and the body of the base 10 may also be cylindrical or complex in shape, so long as an inner cavity structure can be formed by enclosing. In another embodiment, the bottom plate 153 may be omitted, the top of the base plate 13 may be surrounded to form an inner cavity structure, and the driving mechanism 30 may be directly mounted on the ends of the top plate 151, the bottom plate 153, and the side plates 152 without providing the end plate 154.

In one embodiment, the top of the base plate 13 is further provided with a shield 14 for shielding all or part of the body of the base body 10 from chips, dust, and liquid in the processing environment, so as to avoid contamination of the driving mechanism 30, the braking mechanism 40, and the carrying mechanism with structures with high requirements for precision, such as gas actuating elements, or the mating surfaces between the guiding portion 11 and the moving portion 22.

In the embodiment shown in fig. 1-3, the inner cavity of the body of the base 10 forms a guiding portion 11, the guiding portion 11 is a square or rectangular section guiding channel formed by the top plate 151, the bottom plate 153 and the surfaces of the two side plates 152 facing the inner cavity, and the moving portion 22 of the bearing mechanism 20 has a positive or rectangular section outer surface correspondingly, so that the moving portion 22 can move freely in the guiding portion 122. In another embodiment, the guide channel may have a circular cross section, a triangular cross section, etc., and the moving portion 22 is correspondingly provided with a corresponding cross section, as long as the moving portion 22 can stably guide and move in the guide portion 11.

In the embodiment shown in fig. 1-3, the support mechanism 20 is configured to move in a direction toward and away from the workpiece to provide sufficient load bearing force to the workpiece by the support 21 abutting or disengaging the surface of the workpiece. The supporting mechanism 20 includes a moving portion 22 and a supporting portion 21, where the moving portion 22 is configured to move in the guiding portion 11 in a guiding manner in cooperation with the guiding portion 11, in one embodiment, the moving portion 22 is in a rod shape, the rod-shaped section is matched with the guiding portion 11, and the rod-shaped body is integrally penetrating through the guiding portion 11, so that the load force transmitted from the supporting portion 21 is uniformly distributed in the length direction of the rod shape, and the moving stability of the moving portion 22 is ensured, however, the moving portion 22 may also be a relatively shorter moving block, so that the cost can be reduced. The moving part 22 may be a hollow structure, so that the cost and weight of the moving part 22 are further reduced on the basis of ensuring the structural strength of the moving part 22, and the moving part 22 may be a solid or a reinforced rib structure, so that the structural strength of the moving part 22 can be ensured to the greatest extent.

In one embodiment, the rod-shaped portion of the moving portion 22 is inserted into the guiding portion 11, one end of the rod-shaped portion, which is close to the workpiece, is provided with a supporting portion 21, the supporting portion 21 includes a supporting head 211 and a supporting seat 212, the supporting seat 212 is connected with one end of the rod-shaped portion, the supporting head 211 is connected with the other side, which is far away from the rod-shaped portion, of the supporting seat 212, and by providing the supporting head 211, on one hand, the connection manufacturability and the connection strength between the supporting head 211 and the rod-shaped portion are improved, and on the other hand, other accessories such as a waterproof structure can be provided on the supporting head 211.

In the embodiment shown in fig. 1 to 3, the guide pair 12 is disposed between the moving part 22 and the guide part 11 to improve the moving stability of the moving part 22 along the guide part 11, and may be a pair of guide pairs 12 disposed between two side plates 152 of the guide part 11, a pair of guide pairs 12 disposed between the top and bottom of the guide part 11, or a single guide pair 12 disposed only on the top, bottom, or any side of the guide part 11, for example. In another embodiment, each guide pair 12 includes a sliding portion 121, a guide portion 122, and a rolling portion 123, the guide portion 122 is formed in a larger "C" shape that opens toward the moving portion 22, the sliding portion 121 is formed in a smaller "C" shape that opens toward the guide portion 122, the sliding portion 121 and the guide portion 122 are butted against each other, a plurality of rolling portions 123 are embedded between the top and the bottom of the larger "C" shape and the smaller "C" shape, the guide portion 122 and the sliding portion 121 extend along the extending direction of the guide portion 11, and the plurality of rolling portions 123 are correspondingly arranged along the extending direction of the guide portion 11. Illustratively, the sliding portion 121 is fixedly mounted on a rod-shaped side wall, and when the moving portion 22 moves in a direction approaching and moving away from the workpiece, the sliding portion 121 follows the moving portion 22 and is stably engaged with the guide portion 122 in a moving manner under the supporting action of the rolling portion 123. The rolling portion 123 may be a roller, a ball, or a needle, or a roller frame provided with a roller, a ball, or a needle, for example.

In another embodiment, the guiding portion 122 is directly and fixedly connected to the inner cavity of the body of the base 10 by means of screws, adhesion, welding, etc., or may be formed to be fixed by friction force. For example, an elastic portion 124, such as a coil spring, a disc spring or a spring sheet, is disposed at the bottom of the guiding portion 122, the guiding portion 122 is pressed against the top of the inner cavity of the body of the base 10 by the restoring elastic force compressed by the elastic portion 124, and the position of the guiding portion 122 is fixed during the moving process of the moving portion 22 due to the friction force between the guiding portion 122 and the inner cavity of the body of the base 10. For example, the elastic portion 124 may be disposed on top of the guiding portion 122, so that the guiding portion 122 is fixed by friction between the side wall of the inner cavity of the body of the base 10 and the side wall of the "C" shape of the guiding portion 122.

In the embodiment shown in fig. 1-3, the drive mechanism 30 is configured to provide a driving force to the support mechanism 20 via pneumatic pressure. In one embodiment, the driving mechanism 30 includes a linear driving cylinder 31 and a driving rod 32, the linear driving cylinder 31 is disposed on an end plate 154 of the body of the base 10, a through hole is formed in the end plate 154, the driving rod 32 is disposed in the linear driving cylinder 31, and the driving rod 32 is driven by pneumatic pressure, passes through the through hole of the end plate 154 and protrudes into an inner cavity of the body of the base 10, and is connected with the moving part 22 in the inner cavity. In another embodiment, the piston part of the driving rod 32 divides the linear driving cylinder 31 into two chambers, a first interface 33 and a second interface 34 are arranged on the linear driving cylinder 31, the two chambers are respectively communicated, and the driving rod 32 is moved towards or away from the workpiece by pneumatic pressure.

In another embodiment, the driving device may be a pneumatic motor, and the driving rod 32 is driven to move by the rotation output by the motor and converted into a limited motion by using, for example, a rack and pinion pair. In another embodiment, the driving rod 32 may not extend into the inner cavity of the body of the base 10, but be connected to the moving portion 22 outside the body of the base 10 through a connecting rod passing through the side plate 152 of the body of the base 10, so as to move the moving portion 22 in the guiding portion 11.

In the embodiment shown in fig. 1-3, the detent mechanism 40 is used to compress the support mechanism 20 to prevent movement of the support mechanism 20 in the direction of extension of the guide 11. In one embodiment, the braking mechanism 40 includes a braking base 41, a conducting portion 42, and a braking portion 43, where the body of the base 10 is provided with an opening 15, and the position of the opening 15 may be the top of the body of the base 10, the side of the body of the base 10, or even the bottom of the body of the base 10. Illustratively, the brake base 41 covers the opening 15 so that the pneumatic pressure in the opening 15 does not leak, while ensuring the mounting stability and safety of the conductive portion 42.

In another embodiment, the conducting part 42 is disposed in the brake base 41, the brake part 43 is disposed in the opening 15, a cavity is formed between the conducting part 42 and the brake base 41, and a large area is disposed at the top of the conducting part 42 to convert pneumatic pressure into thrust, and since the conducting part 42 is movable in the brake base 41 in a direction approaching and separating from the moving part 22, the brake part 43 is movable in the opening 15 in a direction approaching and separating from the moving part 22, the conducting part 42 pushes the brake part 43 to press the moving part 22, thereby amplifying the pressing force of the brake part 43. Illustratively, the portion of the conductive portion 42 near the brake base 41 may be disc-shaped, rectangular or polygonal, and correspondingly, the space section of the brake base 41 for accommodating the conductive portion 42 is also disc-shaped, rectangular or polygonal, so as to ensure sealing between the periphery of the conductive portion 42 and the inner wall of the brake base 41. Illustratively, the cross-sectional shape of the opening 15 is configured as a circle, the area of the disc adjacent to the brake base 41 is larger than the area adjacent to the brake portion 43, and gas flows through the brake base 41 into the cavity between the conducting portion 42 and the brake base 41, driving the transmission portion to contact the brake portion 43 and pushing the brake portion 43 to press the moving portion 22.

In another embodiment, the brake mechanism 40 further includes a cover 47, where the cover 47 covers the opening 15 for limiting the structure in the opening 15. In another embodiment, a brake interface 45 is provided on the brake base 41, and the gas communicates with the apply chamber of the conducting portion 42 through the brake interface 45.

In another embodiment, the brake mechanism 40 further comprises an adjusting portion 44 for adjusting the distance between the transmission portion and the brake portion 43, for example, the transmission portion and the brake portion 43 cannot be contacted due to a machining error. Illustratively, the adjusting portion 44 is disposed to penetrate a screw disposed in the through hole of the brake base 41 and the conducting portion 42, the portion of the screw in the through hole of the brake base 41 is a polished rod, the portion in the through hole of the conducting portion 42 is a threaded rod, and the adjusting portion is connected to the conducting portion 42 by screw threads, and by turning the screw, the conducting portion 42 can be adjusted to approach or separate from the brake portion 43.

In another embodiment, the brake mechanism 40 further includes a sealing portion 46 for preventing the pneumatic pressure from flowing into the opening portion 15 through the through hole provided through the regulating portion 44 in the case of having the regulating portion 44. Illustratively, the sealing portion 46 is a spherical structure, such as a steel ball or a rubber ball, disposed between the conductive portion 42 and the stopper portion 43 and located at the through-hole opening of the conductive portion 42, seals the through-hole opening, and simultaneously transmits the pushing force of the conductive portion 42 to the stopper portion 43, reducing the processing size of the conductive portion 42.

In the embodiment shown in fig. 4, the pneumatic control system is used to provide pneumatic pressure to the drive mechanism 30 and the brake mechanism 40, and the overall operation of the center rest assembly is achieved by a single pneumatic control system. The pneumatic control system illustratively includes a main pneumatic source circuit having three separate pneumatic source circuits, a first drive mechanism 30, a second drive mechanism 30, and a brake mechanism 40.

Illustratively, the first driving mechanism 30 is in communication with the first port 33 in a split-line manner, the second driving mechanism 30 is in communication with the second port 34 in a split-line manner, and the two chambers of the linear driving cylinder 31 separated by the piston portion are respectively introduced into the two chambers to cooperatively generate a first pneumatic pressure, so as to drive the supporting mechanism 20 to move in a direction approaching and separating from the workpiece. The brake mechanism 40 is in line communication with the brake interface 45, and generates a second pneumatic pressure by the brake mechanism 40 to drive the brake part 43 to press the bearing mechanism 20.

In another embodiment, the pneumatic source main circuit is provided with a pressure reducing valve 51, the branch circuit of the first driving mechanism 30 is provided with a first reversing valve 52, the gas passing through the first reversing valve 52 directly flows into one separating chamber of the linear driving cylinder 31, and the gas of the branch circuit of the second driving mechanism 30 directly flows into the other separating chamber of the linear driving cylinder 31 to generate the first pneumatic pressure in a combined way. The first reversing valve 52 may be a two-position three-way reversing valve, or may be another reversing valve, as long as the gas flow in the sub-line of the first driving mechanism 30 can be controlled or closed. The gas in the second driving mechanism 30 sub-line can be without a control valve, in which case the movement of the driving rod 32 can be realized only by controlling the circulation or the opening and closing of the first driving mechanism 30 sub-line with high pneumatic pressure. The second switching valve 53 is provided on the branching line of the brake mechanism 40, and the gas flowing into the brake mechanism 40 through the second switching valve 53 generates a second pneumatic pressure, and the second pneumatic pressure is controlled to be supplied by the flow or the closing of the second switching valve 53.

For example, the number of the first driving mechanism 30 sub-lines, the second driving mechanism 30 sub-lines, and the braking mechanism 40 sub-lines may be set according to the number of the supporting mechanisms 20 included in the center frame device used in the grinder.

In one embodiment, the second port 34 is continuously supplied with gas, and when the supporting mechanism needs to be controlled to move towards the workpiece, the gas with the pressure greater than that of the second port 34 is supplied to the first port 33, so that the pressure of the rodless cavity of the linear driving cylinder 31 is greater than that of the rod cavity, and the driving rod 32 is caused to perform the extending movement; when the control support mechanism is required to move away from the workpiece, the gas of the first port 33 is closed, the gas supply of the second port 34 is continuously maintained, and at the moment, the pneumatic pressure of the rod cavity of the linear driving cylinder 31 is larger than that of the rod-free cavity, so that the driving rod 32 performs retracting motion.

In an embodiment of another aspect of the present disclosure as shown in fig. 5, a control method of a grinder rest device includes:

s11, providing a first pneumatic pressure to the driving mechanism 30 through the pneumatic control system, so as to be suitable for driving the bearing mechanism 20 to move in the guide part 11 along the extending direction of the guide part 11 towards the workpiece, and thus reaching a workpiece propping state;

s12, maintaining the first pneumatic pressure, and providing a second pneumatic pressure to the brake mechanism 40 through the pneumatic control system so as to be suitable for the brake mechanism 40 to press the bearing mechanism 20, thereby maintaining the state of propping up the workpiece;

and S13, maintaining the first pneumatic pressure, stopping providing the second pneumatic pressure after a period of processing, and releasing the bearing mechanism 20 to automatically move the bearing mechanism 20 towards the workpiece so as to reach the propping working state again.

Illustratively, when the grinder steady rest device is used to support the elongated roll for grinding, the second port 34 is vented with gas prior to roll drop, while the first port 33 is not vented with gas, and the drive rod 32 is in a retracted state away from the roll; after the roller falls, the first reversing valve 52 is used for communicating gas to the first interface 33, the formed first pneumatic pressure drives the bearing mechanism 20 to move until the bearing mechanism abuts against the surface of the roller, at the moment, the second reversing valve 53 is used for communicating gas to the braking interface 45, the formed second pneumatic pressure drives the braking part 43 to press the moving part 22 of the bearing mechanism 20, and the action of pneumatic pressure is amplified due to the friction force generated when the braking part 43 presses the bearing mechanism 20, so that the bearing mechanism 20 can be ensured not to retract stably in the roller grinding process by only using small first pneumatic pressure. During grinding, when the grinding roller is turned over for a period of time, for example, the size of the surface of the roller is reduced, the second pneumatic pressure is switched off through the second reversing valve 53, the braking part 43 is released, the supporting mechanism 20 automatically moves to a new position to automatically abut against the working surface under the driving of the first pneumatic pressure, so that quick adjustment is realized, and the surface of the roller is not damaged due to the smaller first pneumatic pressure; at this time, the second pneumatic pressure is again communicated through the second reversing valve 53, so that the brake 43 presses the backup mechanism 20, and the roll grinding is continued until the grinding is completed.

In another embodiment of the disclosure, the grinding machine includes a grinding machine center frame device, and illustratively, the number of grinding machine center frame devices may be one, so that the grinding machine center frame device may support the workpiece near the middle of the length direction, or may support the workpiece in a plurality of grinding machine center frame devices at intervals along the length direction of the workpiece.

Any references to directions and orientations in the description of the embodiments herein are for convenience only and should not be construed as limiting the scope of the invention in any way. The following description of the preferred embodiments will refer to combinations of features, which may be present alone or in combination, and the invention is not particularly limited to the preferred embodiments. The scope of the invention is defined by the claims.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.

Claims

1. A pneumatic steady rest device for a precision grinding machine for supporting a workpiece during grinding, comprising:

a base;

a base body (10) provided on the base and having a guide portion (11) extending in a direction approaching and separating from the workpiece;

a support mechanism (20) which is arranged in the guide part (11), wherein one end of the support mechanism, which is close to the workpiece, is provided with a support part (21);

the driving mechanism (30) is arranged on the base body (10), and the driving mechanism (30) is connected with the bearing mechanism (20);

a brake mechanism (40) provided on the base body (10), the brake mechanism (40) including a brake portion (43);

wherein the driving mechanism (30) moves through first pneumatic pressure so as to be suitable for driving the bearing mechanism (20) to move in the guide part (11) along the extending direction of the guide part (11);

the braking portion (43) is moved by a second pneumatic pressure, adapted to press and release the holding mechanism (20), so as to prevent and allow the holding mechanism (20) to move in the extending direction of the guide portion (11);

2. The pneumatic centre frame arrangement of a precision grinding machine according to claim 1, characterized in that the basic body (10) is internally provided with an inner cavity extending in a direction towards and away from the work piece, which inner cavity forms the guide (11).

3. The precision grinder pneumatic centre frame assembly according to claim 2, wherein the support mechanism (20) comprises:

a moving portion (22) provided in the guide portion (11) and movable in the direction approaching and separating from the workpiece in the guide portion (11);

and the bearing part (21) is arranged at one end of the moving part (22) close to the workpiece.

4. A precision grinder pneumatic centre frame device according to claim 3, characterized in that at least one pair of guide pairs (12) is provided between the moving part (22) and the guide part (11), the guide pairs (12) comprising a sliding part (121), a guide part (122) and a rolling part (123) provided between the sliding part (121) and the guide part (122); wherein, the top or bottom of the guide part (122) is provided with a tight elastic part (124) so as to be suitable for pressing the guide part (122) against the base body (10) through the elastic force provided by the elastic part (124).

5. The precision grinder pneumatic centre frame assembly according to claim 1, wherein said drive mechanism (30) comprises:

a linear driving cylinder (31) arranged at one end of the base body (10) far away from the workpiece, wherein the linear driving cylinder (31) is provided with an interface;

a driving rod (32) arranged in the linear driving cylinder (31) and extending along the extending direction of the guide part (11), wherein one end of the driving rod (32) close to the workpiece penetrates through the base body (10) to be connected with the bearing mechanism (20);

wherein the driving rod (32) drives the bearing mechanism (20) to move in the guide part (11) along the extending direction of the guide part (11) through the first pneumatic pressure supplied by the interface.

6. The precision grinder pneumatic centre frame assembly according to claim 1, wherein said base body (10) is provided with an opening (15), said braking mechanism (40) further comprising:

a brake base (41) which is provided on the base body (10) and covers the opening (15);

a conduction part (42) arranged in the opening part (15) and provided with a cavity between the conduction part and the brake base (41);

a braking part (43) arranged in the opening part (15) and positioned between the conducting part (42) and the supporting mechanism (20);

a brake interface (45) is arranged on the base body (10) and is communicated with the inside of the opening part (15) so as to be suitable for the pneumatic control system to provide the second pneumatic pressure into the opening part (15) through the brake interface (45), and the second pneumatic pressure drives the brake part (43) to move in the opening part (15) through the conducting part (42) so as to press and release the bearing mechanism (20).

7. The precision grinder pneumatic steady rest device of claim 6, characterized in that the braking mechanism further comprises:

an adjustment part (44) penetrating through the through holes of the brake base (41) and the conductive part (42), and being in threaded connection with the conductive part (42) through the through holes;

and a sealing part (46) provided at the through hole opening of the conductive part (42) so as to be adapted to seal the through hole of the conductive part (42).

8. The precision grinder pneumatic steady rest device of claim 1, characterized in that the pneumatic control system comprises:

a pneumatic source main line provided with a pressure reducing valve;

the first driving mechanism is divided into a line, one end of the first driving mechanism is connected with the pneumatic source main line, and the other end of the first driving mechanism is connected with the driving mechanism (30) through a control valve;

a second drive mechanism sub-line, one end of which is connected with the pneumatic source main line, and the other end of which is connected with the drive mechanism (30), wherein the first drive mechanism sub-line and the second drive mechanism sub-line jointly provide the first pneumatic pressure;

the brake mechanism is branched, one end of the brake mechanism is connected with the pneumatic source main line, and the other end of the brake mechanism is connected with the brake mechanism (40) through a control valve so as to provide the second pneumatic pressure.

9. A control method for controlling the pneumatic steady rest device of a precision grinding machine according to any one of claims 1-8, characterized in that the control method comprises:

providing a first pneumatic pressure to the driving mechanism (30) through the pneumatic control system, so as to be suitable for driving the bearing mechanism (20) to move in the guide part (11) towards the workpiece along the extending direction of the guide part (11), and thus reaching a workpiece propping state;

maintaining said first pneumatic pressure provided, providing a second pneumatic pressure to said brake mechanism (40) via said pneumatic control system adapted to said brake mechanism (40) to compress said holding mechanism (20) to maintain said biased workpiece condition;

and after a period of processing, stopping providing the second pneumatic pressure to be suitable for loosening the bearing mechanism (20) so as to enable the bearing mechanism (20) to automatically move towards the workpiece, thereby reaching the propping working state again.

10. A precision grinding machine, comprising:

at least one pneumatic centre frame assembly of a precision grinding machine according to any one of claims 1 to 8.