CN112873047A

CN112873047A - Positioning device and polishing machine with same

Info

Publication number: CN112873047A
Application number: CN202110069938.9A
Authority: CN
Inventors: 孔火群
Original assignee: Lens Intelligent Robot Changsha Co Ltd
Current assignee: Lens Intelligent Robot Changsha Co Ltd
Priority date: 2021-01-19
Filing date: 2021-01-19
Publication date: 2021-06-01

Abstract

The invention discloses a positioning device and a polishing machine with the same, wherein the positioning device comprises: a frame; the transmission assembly and the positioning rod are arranged on the rack; and the rotating plate is connected with the output end of the transmission assembly and is provided with a positioning hole matched with the positioning rod in an inserting and embedding manner and a pressing plate moving synchronously with the rotating plate. Above-mentioned positioner can effectively adjust the position that is used for the clamp to treat the clamp plate of polishing product to avoid polishing the wheel touch except treating the other parts of polishing product in the polishing process.

Description

Positioning device and polishing machine with same

Technical Field

The invention relates to the technical field of processing equipment, in particular to a positioning device and a polishing machine with the same.

Background

In the glass processing industry and other industries, polishing machines are often used for polishing glass.

The polishing machine generally comprises a motor and a polishing wheel, wherein the motor drives the polishing wheel to rotate at a high speed, so that a part of the lens to be polished is contacted with the polishing wheel coated with a polishing agent to generate friction and is polished to be smooth and bright. Because of the force required during polishing, the glass needs to be clamped and fixed.

In the prior art, an upper pressing plate and a lower pressing plate are respectively arranged on the upper surface and the lower surface of a glass lamination for clamping and fixing the glass lamination. In order to avoid the upper pressure plate and the lower pressure plate from touching the polishing wheel, the edges of the upper pressure plate and the lower pressure plate are aligned, and the edges of the upper pressure plate and the lower pressure plate are close to the inner side by about 10mm compared with the edge of the glass lamination, so that the upper pressure plate, the glass lamination and the lower pressure plate rotate synchronously during the polishing process, namely the relative positions of the upper pressure plate and the lower pressure plate are unchanged.

When polishing is complete, the upper platen and lower platen are separated, the glass laminate can be removed, and a new glass laminate to be processed can be placed. At this time, because the upper pressing plate and the lower pressing plate are separated, the upper pressing plate and the lower pressing plate are easy to move, so that the edges of the upper pressing plate and the lower pressing plate are in non-aligned positions, when the upper pressing plate and the lower pressing plate clamp the glass lamination again, the edges of the upper pressing plate may be located on the outer side of the glass lamination, so that the upper pressing plate touches the polishing wheel in the polishing process, and the polishing machine is damaged.

Disclosure of Invention

An object of the present invention is to provide a positioning device and a polishing machine having the same, which can effectively adjust the position of a member for holding a product to be polished, thereby preventing a polishing wheel from touching the remaining members except the product to be polished during polishing.

To achieve the above object, the present invention provides a positioning device, comprising:

a frame;

the transmission assembly and the positioning rod are arranged on the rack;

a rotating plate connected with the output end of the transmission assembly, wherein the rotating plate is provided with a positioning hole matched with the positioning rod in an inserting manner, and

and the pressing plate moves synchronously with the rotating plate.

Optionally, the number of the positioning holes is greater than or equal to the number of the positioning rods.

Optionally, the pressing plate and the rotating plate are connected through a connecting shaft, the end profiles of the two ends of the connecting shaft respectively comprise two alignment edges, and all the alignment edges are parallel; and simultaneously, a connecting line between the two positioning holes inserted and embedded with the two positioning rods is parallel to the alignment edge.

Optionally, the pressing plate and the rotating plate are provided with mounting holes respectively matched with two ends of the connecting shaft, and the pressing plate is plate-shaped and provided with two edges parallel to the alignment edge.

Optionally, the positioning rod includes a pin at an end thereof and inserted into and fitted into the positioning hole.

Optionally, the transmission assembly comprises:

a first driving part arranged on the frame;

a second driving unit provided in the first driving unit and configured to drive the rotating plate to rotate; the first driving part drives the second driving part to be connected with and disconnected from the rotating plate.

Optionally, the rack is further provided with a guide rail, the sliding table is connected to the guide rail in a sliding manner, the sliding table is provided with a movable plate, the movable plate is connected to the first driving portion, and the second driving portion is arranged on the movable plate.

Optionally, the first driving portion is specifically a piston cylinder, a cylinder body of the piston cylinder is arranged on the rack, and a piston rod of the piston cylinder is connected with the movable plate; and/or the presence of a gas in the gas,

the rotating plate is provided with a gear, and the second driving part is provided with a rack meshed with the gear; and/or the presence of a gas in the gas,

the movable plate is further provided with a sliding rail, and the second driving portion is connected to the sliding rail in a sliding mode.

The invention also provides a polishing machine comprising the positioning device.

Optionally, the polishing device further comprises a transmission rotating assembly provided with a pressing sheet, and the pressing sheet and the pressing plate clamp a product to be polished.

Compared with the background art, the positioning device provided by the embodiment of the invention comprises a rack, a positioning rod, a rotating plate, a transmission assembly and a pressing plate, wherein the positioning rod and the transmission assembly are arranged on the rack; when transmission assembly drive rotor plate carries out rotary motion, clamp plate and rotor plate synchronous motion because the locating lever is static in both clamp plate and rotor plate relatively, when the rotor plate rotates to the locating lever can insert when inlaying in the position of locating hole, the locating lever inserts and inlays in the locating hole, and clamp plate and rotor plate can't continue to rotate this moment, and simultaneously, the clamp plate is in and predetermines the position.

The positioning device has the following beneficial effects:

the positioning device comprises a positioning assembly, a positioning rod, a pressing plate, a positioning rod, a positioning device and a positioning device, wherein the pressing plate and the rotating plate synchronously move under the driving action of the transmission assembly; therefore, the position of the pressing plate can be effectively adjusted, and the position of the pressing plate at the preset position relative to the glass lamination to wait for polishing products is reliable; in addition, the pressing plate can also be used as an upper pressing plate in the prior art and is matched with the lower pressing plate to clamp a product to be polished.

The positioning device is simple and reliable in positioning process, the position of the pressing plate can be adjusted only by controlling the rotating plate to rotate, the positioning rod is inserted into the positioning hole to indicate that the position of the pressing plate is adjusted, at the moment, the relative positions of the pressing plate and the rotating plate are stable and cannot be changed, and the pressing plate is reliable to use.

Thirdly, the positioner in this text, overall structure is simple relatively, and the relative position between each part is simple clear, and the installation and the maintenance of being convenient for help promoting positioner's use reliability, the sexual valence relative altitude is favorable to the product popularization.

The embodiment of the invention also provides a polishing machine with the positioning device, which has the beneficial effects, and the details are not repeated herein.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic diagram of a polishing machine with a positioning device according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a positioning apparatus according to an embodiment of the present invention;

FIG. 3 is a schematic view of another angle of the positioning device according to the embodiment of the present invention;

FIG. 4 is a schematic view of a connection shaft of a positioning device according to an embodiment of the present invention;

FIG. 5 is a schematic view of a drive rotation assembly of the polishing machine provided by an embodiment of the present invention;

FIG. 6 is a schematic diagram of a positioning rod, a rotating plate, a connecting shaft, a pressing plate and a pressing plate of the polishing machine according to the embodiment of the present invention;

FIG. 7 is an enlarged view of portion A of FIG. 6;

FIG. 8 is an enlarged view of portion B of FIG. 6;

wherein:

1-a positioning device, 2-a product to be polished,

3-a transmission rotating component, 4-a pressing plate,

5-tabletting, 6-cylinder,

7-a first driving part, 8-a guide rail,

9-positioning rod, 10-rotating plate,

11-rack, 12-gear,

13-a second driving part, 14-a slide rail,

15-sliding table, 16-connecting shaft,

17-a prompting sensor, 18-a movable plate,

19-a fixed seat, 20-a frame,

161-contraposition edge, 91-bolt,

21-tabletting mounting seat, 22-transmission shaft,

23-synchronous wheel, 24-motor,

25-sensor, 41-mounting hole.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

A positioning device 1 according to an embodiment of the present invention is shown in fig. 1 to 8 with reference to the accompanying drawings, and includes: the device comprises a pressing plate 4, a positioning rod 9, a rotating plate 10, a frame 20 and a transmission assembly.

The pressing plate 4 may be embodied as a plate, which functions similarly to the upper pressing plate of the prior art, the pressing plate 4 and the lower pressing plate cooperating to clamp the glass laminate waiting for the polishing product 2.

The positioning device 1 herein has the main purpose of adjusting the position of the pressing plate 4 so as to avoid the phenomenon that the polishing wheel touches other parts except the product 2 to be polished, which occurs in the prior art.

Of course, it is considered that the upper and lower pressing plates in the prior art can be adjusted in position by the positioning device 1 in this document, and correspondingly, the pressing plate 4 in the positioning device 1 can be regarded as the upper and lower pressing plates.

The positioning rod 9 is arranged on the frame 20, the frame 20 can be arranged in a frame shape and plays a role of supporting the positioning rod 9, for example, the description accompanying fig. 2 and fig. 3, a fixing seat 19 can be arranged on the lower surface of the top plate of the frame 20, the top plate of the frame 20 is fixedly connected with the fixing seat 19, and the positioning rod 9 is arranged on the lower surface of the fixing seat 19; of course, the positioning rod 9 may also be provided directly to the frame 20, and is not expanded here.

The rotating plate 10 can be arranged below the positioning rod 9, the rotating plate 10 is provided with a positioning hole, and the transmission assembly is used for driving the rotating plate 10 to rotate; among them, in order to realize the rotation of the rotating plate 10, the rotating plate 10 and the transmission assembly may adopt a structure such as: the gear rack, the worm gear or the lead screw and the like.

The rotating plate 10 and the pressing plate 4 are moved synchronously, and they can be connected by a connecting shaft 16 mentioned later; in addition, the transmission assembly may be provided to a side plate of the frame 20. Obviously, the platen 4 should be provided outside the frame 20 in order to hold the product 2 to be polished.

When the transmission assembly drives the rotating plate 10 to rotate, the pressing plate 4 rotates synchronously with the rotating plate 10, and the positioning rod 9 and the rack 20 are kept still; when the locating hole of rotor plate 10 moved to the below of locating lever 9, locating lever 9 can stretch into the locating hole of rotor plate 10 downwards, at this moment, rotor plate 10 and clamp plate 4 stop rotating, and at this moment, the position of clamp plate 4 is promptly for predetermineeing the position, and also the position that polishing product 2 carries out the centre gripping can be treated as the top board or the holding down plate among the prior art to clamp plate 4, and at this preset position department, the edge of clamp plate 4 can not be located treats the outside of polishing product 2, also can be normal polish.

In the process of inserting the positioning rod 9 into the positioning hole of the rotating plate 10, firstly, the positioning rod 9 should be able to move in the vertical direction, that is, when the positioning rod 9 is located above the positioning hole, the positioning rod 9 should be able to perform a downward movement, and as to which component the movement is provided, the movement may be determined according to actual needs. Secondly, the positioning rod 9 is inserted into the positioning hole, only the bottom end of the positioning rod 9 is inserted into the positioning hole, and the positioning rod 9 does not necessarily need to be entirely inserted into the positioning hole. Finally, only the embodiment is shown in which the positioning rod 9 is located above the positioning hole, and the relative positions of the positioning rod 9 and the rotating plate 10 may be set to be other according to actual needs, and the embodiment is not expanded.

In order to conveniently achieve the purpose that the positioning rod 9 is inserted into and embedded in the positioning hole, the positioning rod 9 can be provided with a telescopic plug pin 91, and the plug pin 91 is positioned at the end part of the positioning rod 9; the top of the plug 91 may be embodied as an elastic member such as a spring, so that the overall length of the plug 91 changes along with the extension and contraction of the spring.

When the positioning rod 9 is not inserted into the positioning hole, the spring is in a compressed state, the transmission assembly drives the rotating plate 10 to rotate, the tail end of the plug 91 and the rotating plate 10 slide relatively, namely, the spring is in a compressed state under the extrusion of the rotating plate 10; when the positioning hole moves to the upper side of the plug 91, the elastic potential energy of the spring is released, and the plug 91 can be inserted into the positioning hole, that is, the relative positions of the positioning rod 9, the rotating plate 10 and the pressing plate 4 are fixed.

Referring to the attached drawing 2 in the specification, the number of the positioning rods 9 can be two, the number of the positioning holes is at least two, and when the two positioning rods 9 are inserted into different positioning holes at the same time, the pressing plate 4 is at a preset position.

In short, the two positioning rods 9 are inserted into different positioning holes at the same time, so that the relative positions of the positioning rods 9 and the rotating plate 10 can be further ensured to be fixed and reliable, the rotating plate 10 can be accurately stopped at a desired position, and the pressing plate 4 is located at a preset position.

The pressing plate 4 and the rotating plate 10 can be connected through a connecting shaft 16, the connecting shaft 16 can be vertically arranged, the end profiles of the two ends of the connecting shaft 16 respectively comprise two aligning edges 161, and all the aligning edges 161 are arranged in parallel.

Of all the positioning holes, the two positioning holes capable of being simultaneously inserted with the two positioning rods 9 are connected in parallel with the alignment edge 161, as shown in fig. 7 in the specification. It is obvious that the portion of the connecting shaft 16 near the top end is located inside the frame 20, the portion of the connecting shaft 16 near the bottom end is located outside the frame 20, and the bottom plate of the frame 20 is provided with a dummy hole for the bottom end of the connecting shaft 16 to extend out, so that the connecting shaft 16 rotates relative to the dummy hole.

As shown in fig. 4 and 7, in order to achieve the convenient installation of the positioning device 1, a portion of the structure can be cut off at both ends of the connecting shaft 16, so that the contour of the end portion changes from circular to waist-shaped, and thus, the pressing plate 4 and the rotating plate 10 should be provided with waist-shaped holes, so that both ends of the connecting shaft 16 are respectively connected with the pressing plate 4 and the rotating plate 10.

The advantage of so setting up lies in, and the both of clamp plate 4 and rotor plate 10 and the connection of connecting axle 16 are comparatively reliable, and after the tip and the waist type hole cooperation of connecting axle 16, have limiting displacement in the axial direction of connecting axle 16, avoid taking place the rotation along the axial, help promoting the reliability of connecting. Meanwhile, the connecting line of the two positioning holes is parallel to the alignment edge 161, so that the position relationship between the connecting shaft 16 and the two positioning rods 9 can be accurately determined.

As mentioned above, both the pressing plate 4 and the rotating plate 10 are provided with the mounting holes 41 respectively fitted to both ends of the connecting shaft 16, the mounting holes 41 being the aforementioned kidney-shaped holes; the pressing plate 4 is plate-shaped, and the pressing plate 4 has two edges parallel to the alignment edge 161.

That is, when two locating levers 9 are inserted respectively and are inlayed in the locating hole of difference, two lines of two locating levers 9 are parallel with two borders of clamp plate 4, and whether can audio-visually observe the position relation between clamp plate 4 and two locating levers 9 normal like this to ensure that clamp plate 4 is in preset position.

For the transmission assembly above, the transmission assembly may include a first driving portion 7 and a second driving portion 13, the first driving portion 7 may be disposed on a side plate of the frame 20, the second driving portion 13 is disposed on the first driving portion 7, and the second driving portion 13 may drive the rotation plate 10 to rotate.

When the position of the pressing plate 4 needs to be adjusted, the first driving unit 7 operates to drive the second driving unit 13 to approach the rotating plate 10 until the second driving unit 13 is connected to the rotating plate 10, the first driving unit 7 stops operating, and then the second driving unit 13 drives the rotating plate 10 to rotate, so that the rotating plate 10 and the pressing plate 4 rotate synchronously with the positioning rod 9.

With the arrangement, when the position of the pressing plate 4 is not required to be adjusted, the first driving part 7 can be used for separating the second driving part 13 from the rotating plate 10, so that the second driving part 13 is prevented from being always in contact with the rotating plate 10, and only when the position of the pressing plate 4 is required to be adjusted, the first driving part 7 and the second driving part 13 can operate, so that the service life of the transmission assembly can be effectively prolonged, and the reliable operation of the positioning device 1 is ensured.

Referring to the description of fig. 2, the two side plates of the frame 20 may further be provided with guide rails 8, the guide rails 8 may extend along the width direction of the frame 20, and the relative positions of the guide rails 8 and the frame 20 are fixed; and each guide rail 8 is slidably connected with a sliding table 15, i.e. the sliding table 15 is slidable relative to the guide rail 8.

The top of the slide table 15 may be provided with a movable plate 18, both the slide table 15 and the movable plate 18 may be synchronously slidable with respect to the guide rail 8, the movable plate 18 is connected to the first driving part 7, and the second driving part 13 is provided to the movable plate 18.

In the process of adjusting the position of the pressing plate 4, the first driving part 7 is controlled to operate, so that the sliding table 15 and the movable plate 18 are driven to slide relative to the guide rail 8, and since the relative positions of the movable plate 18 and the second driving part 13 are fixed, the second driving part 13 slides relative to the guide rail 8, that is, the second driving part 13 moves along the width direction of the frame 20, and the second driving part 13 can be close to or far from the rotating plate 10.

When the second driving part 13 approaches the rotating plate 10 and is attached to the rotating plate 10, the second driving part 13 can drive the rotating plate 10 to rotate. The second driving part 13 may extend in a length direction of the frame 20, that is, an operation direction of the first driving part 7 and an operation direction of the second driving part 13 may be perpendicular to each other, so as to achieve the above-described function.

The first driving portion 7 may be embodied as a piston cylinder, such as a pneumatic cylinder, and the cylinder body of the piston cylinder may be disposed on a side plate of the frame 20, and the piston rod of the piston cylinder is connected to the movable plate 18.

When the piston cylinder operates, the cylinder body of the piston cylinder and the frame 20 are kept relatively static, and the piston rod of the piston cylinder extends and retracts to drive the movable plate 18 to slide on the guide rail 8.

A bending mounting plate can be arranged on a side plate of the rack 20 and comprises two plate bodies arranged at an angle, wherein one plate body is connected with the side plate of the rack 20, and the other plate body is fixed with a cylinder body of a piston cylinder; in addition, the two plate bodies can be vertically arranged, the plate body provided with the piston cylinder can also be provided with a through hole, and after the end part of the piston rod penetrates through the through hole, the end surface of the cylinder body facing the piston rod is fixed with the plate bodies, so that the end parts of the cylinder body and the piston rod are respectively positioned at two sides of the through hole.

The movable plate 18 may be horizontally disposed, and the piston rod and the movable plate 18 may be connected by a vertical plate, and the second driving part 13 and the movable plate 18 may be connected by another vertical plate, which may be vertically disposed, so that the movement direction of the first driving part 7 and the movement direction of the second driving part 13 are perpendicular to each other.

The second driving part 13 can be embodied as a rodless cylinder, the rotating plate 10 is provided with a gear 12, the top of the second driving part 13 can be connected with a rack 11, and the rack 11 and the gear 12 are meshed with each other; when the second driving part 13 drives the rack 11 to move along the length direction of the frame 20, the gear 12 rotates, and the rotating plate 10 rotates, so as to adjust the position of the pressing plate 4.

The movable plates 18 may further have slide rails 14, the second driving portion 13 is slidably connected to the slide rails 14, the slide rails 14 are used as a component for supporting the second driving portion 13 to slide, and two ends of each of the slide rails 14 may be respectively fixed to the two movable plates 18; that is, the number of the guide rail 8, the sliding table 15 and the movable plate 18 may be two, and the two guide rail, the sliding table 15 and the movable plate are respectively arranged outside the two side plates of the frame 20, so that the position of the sliding rail 14 relative to the frame 20 can be reliably fixed.

The upper surface of the top plate of the frame 20 can be further provided with a cylinder 6, the top plate of the frame 20 and the fixing seat 19 can be provided with coaxial through holes, the frame 20 can be arranged on a cylinder seat of the cylinder 6, a piston rod of the cylinder 6 is connected with the rotating plate 10 after penetrating through the through holes, and the piston rod of the cylinder 6 can be collinear with the rotation axis of the rotating plate 10, namely, the rotating plate 10, the connecting shaft 16 and the pressing plate 4 synchronously move along the vertical direction by utilizing the telescopic action of the cylinder 6, and the frame 20 and other components are kept static, so that the clamping and the releasing of the product 2 to be polished can be realized.

Obviously, while the connecting shaft 16 can rotate relative to the profiling hole of the frame 20, the connecting shaft 16 can also move in the vertical direction relative to the profiling hole, and the profiling hole can play a role in limiting and supporting the connecting shaft 16, so that the movement of the connecting shaft 16 is reliable.

Positioner 1 still can be equipped with and frame 20 keeps the fixed suggestion sensor 17 in position, and suggestion sensor 17 can locate frame 20 or fixing base 19, and the effect of suggestion sensor 17 lies in: the prompt positioning rod 9 is inserted into the positioning hole; that is, the prompt sensor 17 can detect the position of the positioning rod 9 in real time, and when the end of the positioning rod 9 is inserted into the positioning hole, the prompt sensor 17 can perform acousto-optic prompt to indicate that the current pressing plate 4 is in the preset position.

The polishing machine with the positioning device 1 provided by the embodiment of the invention comprises the positioning device 1 described in the above specific embodiment, and refer to the attached drawings 1 and 5 in the specification.

The polishing machine further comprises a transmission rotary assembly 3, the transmission rotary assembly 3 is provided with a pressing sheet 5, here, both the pressing sheet 5 and the pressing plate 4 can be provided in a plate shape, the size of both can be consistent, and both can be regarded as an upper pressing plate and a lower pressing plate in the prior art.

Obviously, the pressing sheet 5 and the pressing plate 4 are used for clamping the product 2 to be polished, and the driving rotating assembly 3 drives the pressing sheet 5 to rotate, so that the product 2 to be polished and the positioning device 1 rotate synchronously, that is, the pressing sheet 5 and the pressing plate 4 rotate synchronously.

To the transmission rotating assembly 3, the motor 24 is used as a power supply part, a synchronous belt transmission mode can be adopted to drive the synchronous wheel 23 to rotate, the synchronous wheel 23 and the transmission shaft 22 can be coaxially connected, so that the transmission shaft 22 rotates, the top of the transmission shaft 22 can be provided with the pressing sheet 5, and then the pressing sheet 5 is driven to rotate.

A pressing sheet mounting seat 21 can be arranged between the transmission shaft 22 and the pressing sheet 5 so as to ensure the reliable mounting of the pressing sheet 5; in addition, a sensor 25 can be arranged at the position of the output shaft of the motor 24, the position of the output shaft of the motor 24 can be detected through the sensor 25, so that the output shaft of the motor 24 is controlled to rotate to the initial position, and in the initial position, the edge of the pressing sheet 5 is not positioned at the outer side of the product 2 to be polished, namely, the polishing can be normally carried out.

It is considered that, in the transmission rotary assembly 3, the pressing sheet 5 can be returned to the original position by the sensor 25, and in the positioning device 1, the pressing sheet 4 is in the preset position by adjusting the relative position relationship between the positioning rod 9 and the rotary plate 10, so that the edges of the pressing sheet 5 and the pressing sheet 4 can be aligned to ensure the normal polishing.

In addition to this, the transmission rotary assembly 3 and other parts of the polishing machine can be referred to the prior art and are not expanded herein.

It is noted that, in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.

The positioning device and the polishing machine with the positioning device provided by the invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims

1. A positioning device, comprising:

a frame (20);

the transmission assembly and the positioning rod (9) are arranged on the rack (20);

a rotating plate (10) connected with the output end of the transmission assembly, wherein the rotating plate (10) is provided with a positioning hole matched with the positioning rod (9) in an inserting manner, and

and a pressing plate (4) which moves synchronously with the rotating plate (10).

2. The positioning device according to claim 1, wherein the number of positioning holes is equal to or greater than the number of positioning rods (9).

3. The positioning device according to claim 2, wherein the pressing plate (4) and the rotating plate (10) are connected by a connecting shaft (16), the end profiles of the two ends of the connecting shaft (16) respectively comprise two alignment edges (161), and all the alignment edges (161) are parallel; and the connecting line between the two positioning holes inserted and embedded with the two positioning rods (9) is parallel to the alignment edge (161).

4. The positioning device according to claim 3, wherein both the pressing plate (4) and the rotating plate (10) are provided with mounting holes (41) respectively engaged with both ends of the connecting shaft (16), and the pressing plate (4) has a plate shape having two edges parallel to the alignment edges (161).

5. The positioning device according to any one of claims 1 to 4, characterized in that the positioning rod (9) comprises a plug (91) at its end which fits into the positioning hole.

6. The positioning apparatus of any of claims 1-4, wherein the transmission assembly comprises:

a first drive unit (7) provided to the frame (20);

a second drive unit (13) which is provided in the first drive unit (7) and which rotationally drives the rotary plate (10); the first driving part (7) drives the second driving part (13) and the rotating plate (10) to be connected and disconnected.

7. The positioning device according to claim 6, wherein the frame (20) is further provided with a guide rail (8), the sliding table (15) is slidably connected to the guide rail (8), the sliding table (15) is provided with a movable plate (18), the movable plate (18) is connected with the first driving portion (7), and the second driving portion (13) is provided with the movable plate (18).

8. The positioning device according to claim 7, characterized in that the first drive part (7) is embodied as a piston cylinder, the cylinder body of which is arranged on the machine frame (20), the piston rod of which is connected to the movable plate (18); and/or the presence of a gas in the gas,

the rotating plate (10) is provided with a gear (12), and the second driving part (13) is provided with a rack (11) meshed with the gear (12); and/or the presence of a gas in the gas,

the movable plate (18) is further provided with a sliding rail (14), and the second driving portion (13) is connected to the sliding rail (14) in a sliding mode.

9. A polishing machine comprising a positioning device according to any one of claims 1 to 8.

10. A machine as claimed in claim 9, characterised by comprising a transmission and rotation assembly (3) provided with a presser plate (5), and in that said presser plate (5) and said pressure plate (4) hold the product (2) to be polished.