A polishing device

Abstract

This invention discloses a grinding device, including a motor body, a cylinder end cover, a piston cylinder, and an output shaft. The output shaft is axially slidingly engaged with the rotor shaft of the motor body and connected for torque transmission. The piston cylinder is rotatably engaged with the output shaft and is axially fixed relative to it. The cylinder end cover is fixed to the motor body, forming an air chamber therebetween. The piston portion of the piston cylinder axially separates the air chamber into a pushing chamber and a pushing chamber, each connected to an air pipe connector. By controlling the forward and backward movement of the output shaft in this manner, the same effect as controlling the up and down movement of the entire grinding motor with an independent power mechanism is achieved, allowing the grinding head to float. In summary, this grinding device effectively solves the problem of poor floating effect in current grinding devices.

Description

Technical Field

[0001] This invention relates to the field of polishing technology, and more specifically, to a polishing apparatus. Background Technology

[0002] In glass processing, the rough edges after cutting are typically polished. Existing glass polishing equipment often uses electric actuators or other independent power mechanisms to control the up-and-down movement of the polishing motor. This design is complex, bulky, and costly. Polishing fluid is used during the polishing process, and dust is generated. This dust easily accumulates on the motor shaft, and both dust and polishing fluid can easily penetrate the motor's interior, causing damage.

[0003] In conclusion, how to effectively solve the problem of poor floating effect in current grinding devices is an urgent issue that needs to be addressed by those skilled in the art. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a grinding device that can effectively solve the problem of poor floating effect of current grinding devices.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A grinding device includes a motor body, a cylinder end cover, a piston cylinder, and an output shaft. The output shaft is axially slidingly engaged with the rotor shaft of the motor body and is connected for torque transmission. The piston cylinder is rotatably engaged with the output shaft and is axially fixed relative to it. The cylinder end cover is fixed to the motor body and forms an air chamber therebetween. The piston portion of the piston cylinder axially separates the air chamber into a propulsion chamber and a retraction chamber. The propulsion chamber and the retraction chamber are respectively connected to air pipe joints.

[0007] In the above-mentioned grinding device, the front end of the output shaft is connected to the grinding section. Both the pushing chamber and the retraction chamber are connected to an air source via air pipe connectors. Air intake through the pushing chamber pushes the output shaft axially forward, while air intake through the retraction chamber pushes it axially backward. Because the output shaft and rotor shaft are only connected for torque transmission, and the output shaft and piston cylinder are only connected for axial transmission, both rotational drive and axial thrust are possible. Furthermore, the cylinder end cover is fixed to the motor body, forming a direct air chamber between them, and the piston cylinder is used to assemble the cylinder structure, simplifying the overall structure. By controlling the forward and backward movement of the output shaft in this way, the same effect as controlling the up and down movement of the entire grinding motor with an independent power mechanism is achieved, allowing the grinding head to float. In summary, this grinding device effectively solves the problem of poor floating effect in current grinding devices.

[0008] Preferably, it further includes an air blowing channel connected to an air pipe connector, and the air blowing channel is connected to the fitting gap between the front end of the piston cylinder and the output shaft, so as to drive the gas therein to be discharged out of the piston cylinder in the output direction.

[0009] Preferably, the front end of the piston cylinder and the output shaft are rotatably coupled through a bearing; in front of the bearing, the front end of the piston cylinder and the output shaft are sealed together by an oil seal ring, and the air outlet of the air blowing channel is located in front of the oil seal ring.

[0010] Preferably, the output shaft has multiple radially extending air blowing channels, and the center of the output shaft is also provided with an axial channel, the front end of which is connected to the air blowing channels and the rear end of which extends to the rear end face of the output shaft.

[0011] Preferably, the rear end of the output shaft is inserted into the front end sliding hole of the rotor shaft and slidably fitted thereto; at least one section of the sliding hole is a flat groove, and at least one section of the output shaft is a flat portion that mates with the flat groove to prevent relative rotation between them; the rear end of the sliding hole is connected to an axial air guide hole, the rotor shaft has a radially extending air intake channel, the radially inner end of the air intake channel is connected to the rear end of the axial air guide hole; the radially outer end of the air intake channel communicates with the inner cavity of the motor body, and the motor body is also provided with an air blowing pipe connector for guiding air into the inner cavity of the motor body.

[0012] Preferably, the piston cylinder has an outwardly expanding tapered outlet hole at the front end of the central shaft hole, the air outlet of the air blowing channel is correspondingly provided with the tapered outlet hole, and the front end of the piston cylinder has a flange portion.

[0013] Preferably, the front end of the motor body has a flange end cover, which is fixedly connected to the cylinder end cover. The front side of the flange end cover has an inner cylindrical portion, and the rear end of the flange end cover has a rear cylindrical portion sleeved on the outside of the inner cylindrical portion. The air chamber is formed between the inner cylindrical portion and the rear cylindrical portion. The piston portion is sleeved on the inner cylindrical portion and is in a sealed sliding fit with it. The outer edge of the piston portion is in a sealed sliding fit with the inner side surface of the rear cylindrical portion.

[0014] Preferably, the front side of the flange end cover has an outer cylindrical portion that is sleeved on the outside of the inner cylindrical portion, the outer cylindrical portion is sleeved on the outside of the rear cylindrical portion and sealed between them by an O-ring, and the rear side of the outer edge of the cylinder end cover abuts against the front end of the outer cylindrical portion and is fixedly connected by screws.

[0015] Preferably, the outer side of the flange end cover is provided with push-back connector mounting holes, air blowing connector mounting holes and push-in connector mounting holes for installing air pipe connectors, respectively.

[0016] The flange end cover is provided with a push-back L-shaped channel, an air blowing L-shaped channel and a push-forward L-shaped channel;

[0017] The vertical channel opening of the L-shaped air blowing channel is the air blowing connector mounting hole, and the horizontal channel opening is the air blowing hole facing backward. The air blowing hole connects to the inner cavity of the motor body to connect to the air blowing channel.

[0018] The vertical channel opening of the L-shaped push-back channel is the push-back connector mounting hole, and the horizontal channel opening is the push-back hole facing forward. The outer edge of the cylinder end cover is provided with an axial docking channel that mates with the push-back hole. The cylinder end cover is also provided with an oblique vent hole whose outer end communicates with the axial docking channel. The inner end of the oblique vent hole extends to the push-back cavity.

[0019] The vertical channel opening of the L-shaped propulsion channel is the propulsion joint mounting hole, and the horizontal channel opening is the forward-facing propulsion hole. The propulsion hole is located between the inner cylindrical part and the outer cylindrical part and is located in the propulsion cavity.

[0020] Preferably, it further includes an anti-rotation guide pin; of the piston cylinder and the flange end cover: one is axially slidingly engaged with the anti-rotation guide pin, and the other is axially slidingly engaged with or fixedly connected to the anti-rotation guide pin. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a cross-sectional structural diagram of the grinding device provided in an embodiment of the present invention;

[0023] Figure 2 This is a three-dimensional structural schematic diagram of the polishing device provided in an embodiment of the present invention;

[0024] Figure 3 A three-dimensional structural schematic diagram of the rotor shaft provided in an embodiment of the present invention;

[0025] Figure 4 A schematic cross-sectional view of the rotor shaft provided in an embodiment of the present invention;

[0026] Figure 5 A schematic diagram of the rear structure of the flange end cap provided in an embodiment of the present invention;

[0027] Figure 6 This is a schematic diagram of the front structure of the flange end cap provided in an embodiment of the present invention;

[0028] Figure 7 A three-dimensional structural schematic diagram of the piston cylinder provided in an embodiment of the present invention;

[0029] Figure 8 A cross-sectional structural diagram of the piston cylinder provided in an embodiment of the present invention;

[0030] Figure 9 A three-dimensional structural schematic diagram of the output shaft provided in an embodiment of the present invention;

[0031] Figure 10 A cross-sectional structural diagram of the output shaft provided in an embodiment of the present invention;

[0032] Figure 11 A three-dimensional structural schematic diagram of the cylinder end cap provided in an embodiment of the present invention;

[0033] Figure 12 This is a cross-sectional structural diagram of the cylinder end cover provided in an embodiment of the present invention.

[0034] The following labels are shown in the attached diagram:

[0035] 10-Motor body; 11-Rotor shaft; 111-Intake passage; 112-Shaft guide air hole; 113-Sliding hole; 114-Flat slot;

[0036] 20-Flange end cap; 21-Push-back connector mounting hole; 22-Blow-out connector mounting hole; 23-Push-in connector mounting hole; 24-Push-back hole; 25-Counterhead sealing groove; 26-Anti-rotation guide hole; 27-Blow-out hole; 28-Push-in hole; 29-Piston inner seal mounting groove;

[0037] 30-Piston cylinder; 31-Piston section; 32-Piston external seal mounting groove; 33-Pin hole; 34-Bearing chamber; 35-Bore retaining ring mounting groove; 36-Oil seal mounting chamber; 37-Tapered shaft hole; 39-Anti-rotation guide pin;

[0038] 40 - Output shaft; 41 - Bearing mounting position; 42 - Shaft retaining ring groove; 43 - Flat part; 44 - Tail end cylinder; 45 - Axial channel; 46 - Air blowing channel; 47 - Flange part; 48 - Threaded hole; 49 - Positioning boss;

[0039] 50 - Cylinder end cover; 51 - Seal ring mounting groove; 52 - O-ring mounting groove; 53 - Axial mating channel; 54 - Angled vent hole;

[0040] 60-Bearing;

[0041] 70 - Retaining ring for holes; 71 - Retaining ring for shafts;

[0042] 80 - Piston outer seal ring; 81 - Piston inner seal ring; 82 - Cylinder end cover seal ring; 83 - O-ring; 84 - Oil seal ring; 85 - Annular seal ring;

[0043] 90 - Push pipe connector; 91 - Air blowing pipe connector; 92 - Propulsion pipe connector; 93 - Push chamber; 94 - Propulsion chamber. Detailed Implementation

[0044] This invention discloses a grinding device to effectively solve the problem of poor floating effect in current grinding devices.

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] Please see Figures 1-12 , Figure 1 This is a cross-sectional structural diagram of the grinding device provided in an embodiment of the present invention; Figure 2 This is a three-dimensional structural schematic diagram of the polishing device provided in an embodiment of the present invention; Figure 3 A three-dimensional structural schematic diagram of the rotor shaft provided in an embodiment of the present invention; Figure 4 A schematic cross-sectional view of the rotor shaft provided in an embodiment of the present invention; Figure 5 A schematic diagram of the rear structure of the flange end cap provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the front structure of the flange end cap provided in an embodiment of the present invention; Figure 7 A three-dimensional structural schematic diagram of the piston cylinder provided in an embodiment of the present invention; Figure 8 A cross-sectional structural diagram of the piston cylinder provided in an embodiment of the present invention; Figure 9 A three-dimensional structural schematic diagram of the output shaft provided in an embodiment of the present invention; Figure 10 A cross-sectional structural diagram of the output shaft provided in an embodiment of the present invention; Figure 11 A three-dimensional structural schematic diagram of the cylinder end cap provided in an embodiment of the present invention; Figure 12 This is a cross-sectional structural diagram of the cylinder end cover provided in an embodiment of the present invention.

[0047] In one specific embodiment, this embodiment provides a grinding device, which can be a highly protected floating grinding device. Specifically, the grinding device includes a motor body 10, a cylinder end cover 50, a piston cylinder 30, and an output shaft 40.

[0048] The front end of the output shaft 40 is connected to the grinding section, which rotates to perform grinding, and its axial movement allows for position adjustment. The output shaft 40 can receive thrust from the cylinder structure, allowing it to move axially and achieve axial floating. Simultaneously, the output shaft 40 can receive torque from the rotor shaft 11 of the motor body 10, driving its rotation. For ease of description, the end of the output shaft 40 with the grinding section is designated as the front end (forward), while the end connected to the rotor shaft 11 is designated as the rear end (backward). However, in practice, the forward / backward direction can be vertical, horizontal, or vertical.

[0049] The output shaft 40 and the rotor shaft 11 of the motor body 10 are axially slidingly connected and torque-transmitting. This ensures that the output shaft 40 is not interfered with by the rotor shaft 11 during axial movement, while the rotation of the rotor shaft 11 drives the output shaft 40 to rotate. Specifically, the output shaft 40 and the rotor shaft 11 can be axially slidingly connected via a non-circular hole-and-post joint, allowing torque transmission between them. Examples of suitable joints include square holes and posts, semi-circular holes and posts, elliptical holes and posts, and cross-shaped holes and posts. The positions of the holes and posts are not limited; the output shaft 40 can have a mating hole, and the rotor shaft 11 can have a mating post.

[0050] The piston cylinder 30 and the output shaft 40 are rotatably fitted and axially fixed. Specifically, the piston cylinder 30 can be sleeved on the outside of the output shaft 40, or the output shaft 40 can be sleeved on the outside of the piston cylinder 30, to achieve rotatable fit and axial relative fixation. This allows the piston cylinder 30 to transmit axial thrust to the output shaft 40, while the rotation of the output shaft 40 is not interfered with by the piston cylinder 30.

[0051] The cylinder end cap 50 is directly fixed to the motor body 10, forming an air chamber between them. The piston portion of the piston cylinder 30 axially separates the air chamber into a thrust chamber 94 and a push-back chamber 93, thus forming the cylinder structure. Alternatively, the cylinder head 50 can be placed over the front end face of the motor body 10, thereby sealing the cavity of the cylinder head 50 to form the air chamber. Or, the front end of the motor body 10 can form a groove-shaped structure, which is then placed over the rear end face of the cylinder head 50, so that the groove of the groove-shaped structure serves as the air chamber.

[0052] The propulsion chamber 94 and the return chamber 93 are each connected to an air pipe connector for connection to an air source. For example, the propulsion chamber 94 is used to connect to the propulsion pipe connector 92, while the return chamber 93 is used to connect to the return pipe connector. When air enters the propulsion chamber 94, it can push the piston cylinder 30 forward through the piston part 31, i.e., axially forward, at which time the return chamber 93 exhausts air. When air enters the return chamber 93, it can push the piston cylinder 30 backward through the piston part 31, i.e., axially backward, at which time the propulsion chamber 94 exhausts air.

[0053] In some embodiments, when using the above-described grinding device, the front end of the output shaft 40 is connected to a grinding section, and both the push chamber 94 and the push-back chamber 93 are connected to an air source via air pipe connectors. Air intake through the push chamber 94 pushes the output shaft 40 axially forward, while air intake through the push-back chamber 93 pushes the output shaft 40 axially backward. Because the output shaft 40 and the rotor shaft 11 are only connected for torque transmission, and the output shaft 40 and the piston cylinder 30 are only connected for axial transmission, both rotational drive and axial push are possible. Furthermore, the cylinder end cover 50 is fixed to the motor body 10, forming a direct air chamber, and combined with the piston cylinder 30 to form a cylinder structure, simplifying the overall structure. By controlling the forward and backward movement of the output shaft 40 in this way, the same effect as controlling the up and down movement of the entire grinding motor with an independent power mechanism is achieved, allowing the grinding head to float. In summary, this grinding device effectively solves the problem of poor floating effect in current grinding devices.

[0054] In some embodiments, a blowing channel connected to an air pipe connector may be included, wherein the fitting gap between the front end of the piston cylinder 30 and the output shaft 40 is connected to the blowing channel 46, so that the gas therein is discharged out of the piston cylinder 30 in the output direction. For example, if the middle part of the output shaft 40 extends from the central shaft hole at the front end of the piston cylinder 30 to the outside, the aforementioned fitting gap is formed, and the fitting gap is connected to the blowing channel 46. When high-pressure gas enters the blowing channel 46, the high-pressure gas will flow forward until it flows out from the front end of the piston cylinder 30. During the forward flow, a blowing force is generated, which can prevent dust from entering the fitting gap and can effectively prevent dust and grinding fluid from entering the inner cavity of the motor body 10 along the output shaft 40 and the rotor shaft 11.

[0055] In some embodiments, the front end of the piston cylinder 30 and the output shaft 40 can be rotated together by a bearing 60 to reduce rotational friction. Of course, the rotational fit can also be achieved by a bearing bush or the like, or directly by a cylindrical hole or column.

[0056] In some embodiments, the front end of the piston cylinder 30 can be sealed to the output shaft 40 by an oil seal ring 84, and the oil seal ring 84 can be located on the front side of the bearing 60, with the air outlet of the air blowing channel 46 located on the front side of the oil seal ring 84. The oil seal ring 84 can be embedded in the output shaft 40 or in the piston cylinder 30. Specifically, the piston cylinder 30 can have an oil seal mounting chamber 36 to maintain relative fixation to the piston cylinder 30 in the axial direction.

[0057] In some embodiments, for ease of installation, a bearing chamber 34 can be provided inside the piston cylinder 30, and a bearing mounting position 41 can be provided on the corresponding output shaft 40 to mate with the bearing 60. The outer diameter of the bearing chamber 34 can be larger than the outer diameter of the oil seal mounting chamber 36. To prevent axial movement of the bearing 60, a retaining ring 70 for the bore and a retaining ring 71 for the shaft are preferably included. The retaining ring 71 for the shaft is installed in the retaining ring groove 42 of the output shaft 40 to prevent the output shaft 40 and the bearing 60 from separating. The retaining ring 70 for the bore is installed in the retaining ring mounting groove 35 of the piston cylinder 30 to prevent the bearing 60 from dislodging from the bearing chamber 34.

[0058] In some embodiments, the output shaft 40 may have multiple radially extending air blowing channels 46, such as two or more air blowing channels 46. An axial channel 45 is also provided at the center of the output shaft 40, the front end of which communicates with the air blowing channels 46 and the rear end of which extends to the rear end face of the output shaft 40. Air can be guided into the aforementioned mating gap through the axial channel 45 and the air blowing channels 46 in the output shaft 40. This not only facilitates air guidance but also allows for the uniform introduction of the high-pressure gas into the annular mating gap.

[0059] In some embodiments, the rear end of the output shaft 40 can be inserted into the front end sliding hole 113 of the rotor shaft 11, with a sliding fit between them. To better achieve torque transmission, at least one section of the sliding hole 113 can be a flat groove 114, and at least one section of the output shaft 40 can be a flat portion 43 that mates with the flat groove 114, thus preventing relative rotation between them. The flat portion 43 can be a flat pin structure, and the flat portion 43 can be the structure remaining after the two sides of a cylindrical portion have been removed. At least one section can be the entire section or a portion thereof.

[0060] In some embodiments, the axial channel 45 can extend directly to the outside of the motor body 10 to connect to the air pipe connector. For easier connection, the rear end of the sliding hole 113 can also be connected to an axial air guide hole 112 to connect to the axial channel 45. The rotor shaft 11 has a radially extending air intake channel 111, wherein the radially inner end of the air intake channel 111 connects to the rear end of the axial air guide hole 112. The radially outer end of the air intake channel 111 communicates with the inner cavity of the motor body 10, and the motor body 10 is also provided with an air blowing pipe connector 91 for guiding air to the inner cavity of the motor body 10. Through the above-described mating method, the rear end of the output shaft 40 can also easily slide freely within the sliding hole 113.

[0061] In some embodiments, to achieve a better purging effect, the front end of the central shaft hole of the piston cylinder 30 may be provided with an outwardly expanding tapered shaft outlet hole 37, and the air outlet of the air blowing channel 46 is correspondingly arranged with the tapered shaft outlet hole 37, that is, the air outlet of the air blowing channel 46 is directly opposite the tapered shaft outlet hole 37.

[0062] In some embodiments, the front end of the piston cylinder 30 may have a flange portion 47 for easy connection of a grinding head. Specifically, the flange portion 47 may have a threaded hole 48 for easy connection of the grinding head via screws. The flange portion 47 may also have a forward-protruding positioning boss 49 in its middle portion for positioning and engaging with the grinding head, primarily positioning the axis. Specifically, the sliding hole 113 may have a cylindrical hole, with the cylindrical end of the output shaft 40 engaging with this cylindrical hole.

[0063] In some embodiments, the front end of the motor body 10 may have a flange end cover 20 for engaging with the cylinder end cover 50 to form an air chamber. Specifically, the flange end cover 20 may be fixedly connected to the cylinder end cover 50, the front side of the flange end cover 20 has an inner cylindrical portion, the rear end of the flange end cover 20 has a rear cylindrical portion sleeved on the outside of the inner cylindrical portion, and an air chamber is formed between the inner cylindrical portion and the rear cylindrical portion. The piston portion 31 is sleeved on the inner cylindrical portion and there is a sealing sliding fit between them, and there is a sealing sliding fit between the outer edge of the piston portion 31 and the inner side surface of the rear cylindrical portion.

[0064] In some embodiments, the piston portion 31 is sleeved on the inner cylindrical portion and they are in a sealing sliding fit, such as the inner side of the piston portion 31 and the outer side of the inner cylindrical portion being sealed together by an inner piston sealing ring 81. Specifically, one of the inner side of the piston portion 31 and the outer side of the inner cylindrical portion may have a groove to accommodate the inner piston sealing ring 81, such as the outer side of the inner cylindrical portion having a piston inner seal mounting groove 29.

[0065] In some embodiments, a sealing sliding fit is made between the outer edge of the piston portion 31 and the inner side surface of the rear cylindrical portion, such as a sealing connection between the outer side surface of the piston portion 31 and the inner side surface of the rear cylindrical portion through an outer piston sealing ring 80. Specifically, one of the outer edge of the piston portion 31 and the inner side surface of the rear cylindrical portion may have a groove to accommodate the outer piston sealing ring 80, such as an outer piston sealing mounting groove 32 provided on the outer edge of the piston portion 31.

[0066] In some embodiments, the inner side of the inner cylindrical portion may have another bearing, through which the aforementioned rotor shaft 11 passes.

[0067] In some embodiments, to facilitate the fixed connection between the flange end cap 20 and the cylinder end cap 50, the front side of the flange end cap 20 may have an outer cylindrical portion that sleeves on the outside of the inner cylindrical portion. The outer cylindrical portion is sleeved on the outside of the rear cylindrical portion and sealed between them by an O-ring 83 to achieve a better seal for the propulsion chamber 94. Specifically, one of the inner surface of the outer cylindrical portion and the outer surface of the rear cylindrical portion may have a groove to accommodate the O-ring 83, such as an O-ring mounting groove 52 on the outer surface of the rear cylindrical portion.

[0068] In some embodiments, the cylinder end cover 50 and the flange end cover 20 are fixedly connected, such that the rear side of the outer edge of the cylinder end cover 50 abuts against the front end of the outer cylindrical part and is fixedly connected by screws.

[0069] In some embodiments, the cylinder end cap 50 may be slidably sealed to the outer side of the front rod portion of the piston cylinder 30 to close the aforementioned push-back chamber 93. The cylinder end cap 50 may be provided with a sealing ring mounting groove 51 for mounting a cylinder end cap sealing ring 82, which seals between the cylinder end cap 50 and the front rod portion of the piston cylinder 30.

[0070] In some embodiments, to facilitate gas channel connection, the outer surface of the flange end cover 20 may be provided with push-back connector mounting holes 21, air blowing connector mounting holes 22, and push-in connector mounting holes 23 for installing gas pipe connectors. Preferably, the push-back connector mounting holes 21, air blowing connector mounting holes 22, and push-in connector mounting holes 23 are concentrated on the same side of the flange end cover 20. The push-back connector mounting hole 21 is connected to a push-back pipe connector 90, the air blowing connector mounting hole 22 is connected to an air blowing pipe connector 91, and the push-in connector mounting hole 23 is connected to a push-in pipe connector 92.

[0071] In some embodiments, the flange end cover 20 may have a push-back L-shaped channel, an air blowing L-shaped channel, and a push-forward L-shaped channel.

[0072] The vertical channel opening of the L-shaped air blowing channel is the air blowing connector mounting hole 22, and the horizontal channel opening is the rearward-facing air blowing hole 27. The air blowing hole 27 connects to the inner cavity of the motor body 10 to connect to the air blowing channel 46, that is, it enters the air blowing channel 46 in sequence through the air inlet channel 111, the axial guide air hole 112, and the axial channel 45.

[0073] The L-shaped return channel has a vertical channel opening as a return joint mounting hole 21 and a horizontal channel opening as a forward-facing return hole 24. An axial docking channel 53, which mates with the return hole 24, is provided on the outer edge of the cylinder end cover 50. The cylinder end cover 50 also has an oblique vent hole 54, the outer end of which communicates with the axial docking channel 53, and the inner end of the oblique vent hole 54 extends to the return cavity 93. Specifically, the axial docking channel 53 can be located on the outer edge of the cylinder end cover 50. To achieve better sealing, an annular sealing ring 85 can be provided between the return hole 24 and the axial docking channel 53. For example, the return hole 24 can be provided with a countersunk sealing groove 25 to accommodate the annular sealing ring 85.

[0074] The vertical channel opening of the L-shaped channel is the mounting hole 23 of the propulsion joint, and the horizontal channel opening is the forward-facing propulsion hole 28. The propulsion hole 28 is located between the inner cylindrical part and the outer cylindrical part and is located in the propulsion cavity 94.

[0075] In some embodiments, to better prevent relative rotation between the piston cylinder 30 and the flange end cover 20, an anti-rotation guide pin 39 may be included. One piston cylinder 30 and the flange end cover 20 may be axially slidably engaged with the anti-rotation guide pin 39, while the other is axially slidably engaged with or fixedly connected to the anti-rotation guide pin 39. For example, the anti-rotation guide pin 39 may have an interference fit or clearance fit with the pin hole 33 on the rear end face of the piston cylinder 30, while the anti-rotation guide pin 39 may have a slidable fit with the anti-rotation guide hole 26 on the front side of the flange end cover 20.

[0076] In some embodiments, such as Figure 1 , 2 As shown, a highly protected floating grinding device includes a motor body 10, three air pipe connectors (return pipe connector 90, air blowing pipe connector 91, and push pipe connector 92), a flange end cover 20, a cylinder end cover 50, an O-ring 83, a cylinder end cover sealing ring 82, an annular sealing ring 85, a piston cylinder 30, an outer piston sealing ring 80, an inner piston sealing ring 81, an anti-rotation guide pin 39, an oil seal sealing ring 84, an output shaft 40, a bearing 60, a hole retaining ring 70, and a shaft retaining ring 71.

[0077] The output shaft 40 is connected to the piston cylinder 30 via the bearing 60, forming a rotational separation. An oil seal ring 84 is installed in the oil seal mounting chamber 36 of the piston cylinder 30 to ensure a rotational seal between the piston cylinder 30 and the output shaft 40. A retaining ring 70 is installed in the retaining ring mounting groove 35 of the piston cylinder 30 to prevent the bearing 60 from dislodging from the bearing chamber 34. A shaft retaining ring 71 is installed in the shaft retaining ring groove 42 of the output shaft 40 to prevent the output shaft 40 and the bearing 60 from separating.

[0078] The piston outer seal ring 80 is installed in the piston outer seal mounting groove 32 of the piston cylinder 30, wherein the anti-rotation guide pin 39 is interference-fitted into the pin hole 33 of the piston cylinder 30. The cylinder end cover seal ring 82 is installed in the seal ring mounting groove 51 of the cylinder end cover 50, and the O-ring 83 is installed in the O-ring mounting groove 52 of the cylinder end cover 50. The piston inner seal ring 81 is installed in the piston inner seal mounting groove 29 of the flange end cover 20.

[0079] The cylinder end cover 50 is positioned by fitting with the flange end cover 20 through a stop and is fixed by bolts. The axial mating channel 53 of the cylinder end cover 50 and the push hole 24 on the end face of the flange end cover 20 are aligned and connected. The annular sealing ring 85 is installed in the countersunk sealing groove 25 on the end face of the push hole 24 of the flange end cover 20, which serves to seal the air passage connection.

[0080] The anti-rotation guide pin 39 is inserted into the anti-rotation guide hole 26 during the assembly of the whole machine to form a clearance fit. It plays a guiding role when the piston cylinder 30 and the output shaft 40 move in extension and retraction, and prevents the piston cylinder 30 from being driven to rotate when the output shaft 40 rotates.

[0081] The flat portion 43 of the output shaft 40 mates with the flat groove 114 of the rotor shaft 11, serving to transmit torque. The cylindrical end 44 of the output shaft 40 mates with the sliding hole 113 of the rotor shaft 11, providing auxiliary support for the output shaft 40 and ensuring smooth operation of the output shaft 40 during rotation. The push-back pipe connector 90, the air blowing pipe connector 91, and the push-in pipe connector 92 are correspondingly installed in the push-back connector mounting hole 21, the air blowing connector mounting hole 22, and the push-in connector mounting hole 23 of the flange end cover 20.

[0082] Through the above structural design, a cylinder structure is integrated into the front of the motor, forming a push-back chamber 93 and a push-forward chamber 94 between the cylinder end cover 50, flange end cover 20, and piston cylinder 30. When air is supplied to the push-forward pipe connector 92, the gas flows through the air passage to the push-forward chamber 94, pushing the piston cylinder 30 and output shaft 40 forward a certain distance. The gas in the push-back chamber 93 is then discharged from the push-back pipe connector 90 through the air passage. When air is supplied to the push-back pipe connector 90, the gas flows through the air passage to the push-back chamber 93, pushing the piston cylinder 30 and output shaft 40 back to their original position. The gas in the push-forward chamber 94 is then discharged from the push-forward pipe connector 92 through the air passage. By controlling the up-and-down movement of the output shaft 40 in this way, the same effect as controlling the up-and-down movement of the entire grinding motor with an independent power mechanism is achieved, allowing the grinding head to float. The air-blowing connector 91 is always open to air. The gas passes through the air-blowing hole 27, the internal cavity of the motor body, the air inlet channel 111 of the rotor shaft 11, and the axial guide air hole 112 to the axial channel 45 of the output shaft 40, and then exits from the air-blowing channel 46 of the output shaft 40. The output shaft 40 rotates during operation, so the gas exiting from the air-blowing channel 46 of the output shaft 40 continuously blows air around the tapered shaft outlet hole 37 of the piston cylinder 30 in a 360° circumference, preventing dust and grinding fluid from entering the motor.

[0083] In some embodiments, such as Figure 3 , 4 As shown, the rotor shaft 11 in the motor body 10 has an air intake channel 111 that passes through the shaft in the radial direction and communicates with the axial air guide hole 112. The shaft end has a sliding hole 113 and a flat groove 114.

[0084] In some embodiments, such as Figure 5 , 6 As shown, the flange end cover 20 is provided with a push-back connector mounting hole 21, an air blowing connector mounting hole 22, and a push-in connector mounting hole 23. The push-back connector mounting hole 21 is connected to the push-back hole 24 on the end face of the flange end cover 20 to form an air passage. The end face of the push-back hole 24 is also provided with a countersunk sealing groove 25. The air blowing connector mounting hole 22 is connected to the air blowing hole 27 on the inner side of the flange end cover 20 to form an air passage. The push-in connector mounting hole 23 is connected to the push-in hole 28 in the groove on the end face of the flange end cover 20 to form an air passage. The groove on the end face of the flange end cover 20 is provided with a non-penetrating anti-rotation guide hole 26, and the front end is provided with a piston inner sealing mounting groove 29.

[0085] In some embodiments, such as Figure 7 , 8 As shown, the piston cylinder 30 is provided with a piston external seal mounting groove 32, a pin hole 33, a bearing chamber 34, a retaining ring mounting groove 35, an oil seal mounting chamber 36, and a tapered shaft outlet hole 37.

[0086] In some embodiments, such as Figure 9 , 10 As shown, the output shaft 40 is provided with a bearing mounting position 41, a shaft retaining ring groove 42, two flat parts 43, a tail cylinder 44, an axial channel 45, and a blowing channel 46 that passes through the shaft. The blowing channel 46 is connected to the axial channel 45 and is aligned with the tapered shaft outlet hole 37 of the piston cylinder 30 after the whole machine is installed. The output shaft 40 is also provided with a flange part 47, which is provided with four threaded holes 48 and a positioning boss 49 for customers to install grinding heads.

[0087] In some embodiments, such as Figure 11 , 12 As shown, the cylinder end cover 50 is provided with a sealing ring mounting groove 51, an O-ring mounting groove 52, an axial docking channel 53 and an oblique vent hole 54. The axial docking channel 53 and the oblique vent hole 54 are connected, and the oblique vent hole 54 is connected to the inner side of the cylinder end cover 50.

[0088] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0089] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A polishing device, comprising a motor body (10), characterized in that, It also includes a cylinder end cover (50), a piston cylinder (30), and an output shaft (40). The output shaft (40) is axially slidingly engaged with the rotor shaft (11) of the motor body (10) and is connected for torque transmission. The piston cylinder (30) is rotatably engaged with the output shaft (40) and is axially fixed relative to it. The cylinder end cover (50) is fixed on the motor body (10) and forms an air chamber between them. The piston part (31) of the piston cylinder (30) axially separates the air chamber into a thrust chamber (94) and a push chamber (93). The thrust chamber (94) and the push chamber (93) are respectively connected to air pipe joints. The output shaft (40) and the rotor shaft (11) are axially engaged through a non-circular hole column and can transmit torque between them. The cylinder end cover (50) is covered on the front end face of the motor body (10) so that the cover cavity of the cylinder end cover (50) is closed to form the air chamber. It also includes an air blowing channel connected to an air pipe connector. The air blowing channel (46) is connected to the fitting gap between the front end of the piston cylinder (30) and the output shaft (40), so that the gas therein is driven to be discharged out of the piston cylinder (30) in the output direction. The front end of the motor body (10) has a flange end cover (20), the front side of the flange end cover (20) has an inner cylindrical part, the front side of the flange end cover (20) has an outer cylindrical part sleeved on the outside of the inner cylindrical part, and the outer side of the flange end cover (20) is provided with push-back connector mounting holes (21), air blowing connector mounting holes (22) and push-in connector mounting holes (23) for installing air pipe connectors respectively. The flange end cap (20) is provided with a push-back L-shaped channel, an air blowing L-shaped channel and a push-forward L-shaped channel; The vertical channel opening of the L-shaped air blowing channel is the air blowing connector mounting hole (22), and the horizontal channel opening is the rearward-facing air blowing hole (27). The air blowing hole connects to the inner cavity of the motor body (10) to connect to the air blowing channel (46). The vertical channel opening of the L-shaped push-back channel is the push-back connector mounting hole (21), and the horizontal channel opening is the push-back hole (24) facing forward. The outer edge of the cylinder end cover (50) is provided with an axial docking channel (53) that docks with the push-back hole (24). The cylinder end cover (50) is also provided with an oblique vent hole (54) whose outer end communicates with the axial docking channel (53). The inner end of the oblique vent hole (54) extends to the push-back cavity (93). The vertical channel opening of the L-shaped propulsion channel is the propulsion joint mounting hole (23), and the horizontal channel opening is the forward-facing propulsion hole (28). The propulsion hole (28) is located between the inner cylindrical part and the outer cylindrical part and is located in the propulsion cavity (94).

2. The polishing device according to claim 1, characterized in that, The front end of the piston cylinder (30) and the output shaft (40) are rotated together by a bearing (60); in front of the bearing (60), the front end of the piston cylinder (30) and the output shaft (40) are sealed together by an oil seal ring (84), and the air outlet of the air blowing channel (46) is located in front of the oil seal ring (84).

3. The polishing device according to claim 2, characterized in that, The output shaft (40) has multiple radially extending air blowing channels (46), and the center of the output shaft (40) is also provided with an axial channel (45). The front end of the axial channel (45) is connected to the air blowing channel (46), and the rear end extends to the rear end face of the output shaft (40).

4. The polishing device according to claim 3, characterized in that, The rear end of the output shaft (40) is inserted into the front end sliding hole (113) of the rotor shaft (11) and they slide together; at least one section of the sliding hole (113) is a flat groove (114), and at least one section of the output shaft (40) is a flat part (43) that cooperates with the flat groove (114) to prevent relative rotation between them; the rear end of the sliding hole (113) is connected to an axial air guide hole (112), the rotor shaft (11) has a radially extending air intake channel (111), the radial inner end of the air intake channel (111) is connected to the rear end of the axial air guide hole (112); the radial outer end of the air intake channel (111) communicates with the inner cavity of the motor body (10), and the motor body (10) is also provided with an air blowing pipe connector (91) for guiding air to the inner cavity of the motor body (10).

5. The polishing apparatus according to claim 4, characterized in that, The piston cylinder (30) has an outwardly expanding tapered outlet hole (37) at the front end of the central shaft hole. The air outlet of the air blowing channel (46) is correspondingly provided with the tapered outlet hole (37). The front end of the piston cylinder (30) has a flange portion (47).

6. The polishing apparatus according to any one of claims 1-5, characterized in that, The flange end cap (20) is fixedly connected to the cylinder end cap (50). The rear end of the flange end cap (20) has a rear cylindrical portion sleeved on the outside of the inner cylindrical portion, and the air chamber is formed between the inner cylindrical portion and the rear cylindrical portion. The piston portion (31) is sleeved on the inner cylindrical portion and is in a sealed sliding fit with it. The outer edge of the piston portion (31) is in a sealed sliding fit with the inner side surface of the rear cylindrical portion.

7. The polishing apparatus according to claim 6, characterized in that, The outer cylindrical part is sleeved on the outside of the rear cylindrical part and sealed between them by an O-ring (83). The rear side of the outer edge of the cylinder end cover (50) abuts against the front end of the outer cylindrical part and is fixedly connected by screws.

8. The polishing apparatus according to claim 1, characterized in that, It also includes an anti-rotation guide pin (39); of the piston cylinder (30) and the flange end cover (20): one is axially slidingly engaged with the anti-rotation guide pin (39), and the other is axially slidingly engaged with or fixedly connected to the anti-rotation guide pin (39).

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