CN219310747U

CN219310747U - Pressure attaching mechanism and engraving and milling machine

Info

Publication number: CN219310747U
Application number: CN202222622396.6U
Authority: CN
Inventors: 蒋淑娟; 李新民
Original assignee: Goertek Optical Technology Co Ltd
Current assignee: Goertek Optical Technology Co Ltd
Priority date: 2022-09-30
Filing date: 2022-09-30
Publication date: 2023-07-07
Anticipated expiration: 2032-09-30

Abstract

The application discloses a press attachment mechanism and an engraving and milling machine, comprising a pressing device and a positioning device; the compressing device comprises a driving part and a floating device; the floating device comprises a floating joint fixing plate, a floating joint, a guide column, a cover plate and a guide pin; the floating joint is movably connected with the floating joint fixing plate, the cover plate is connected with the floating joint, the guide column is arranged on one of the floating joint and the floating joint fixing plate, a guide groove is formed in the other one of the floating joint and the floating joint fixing plate, the guide column is located in the guide groove, the transverse size of the guide groove is larger than that of the guide column, and the guide pin is arranged on the cover plate. In the application, the precise positioning of the relative positions of the cover plate and the profiling base is realized through the coarse positioning and the precise positioning of the positioning pin of the floating joint; the product support is designed to be an inclined plane support so as to ensure the yield of the appearance of the product.

Description

Pressure attaching mechanism and engraving and milling machine

Technical Field

The present application relates to the field of electronic products and other mechanical manufacturing, and more particularly, to an attaching mechanism and an engraving and milling machine.

Background

As the range of applications for VR/AR increases, the quality requirements for optical elements in VR/AR devices also increase. Based on the higher processing precision requirement of the optical element, the engraving and milling machine is also applied to the processing production of the optical element. The engraving and milling machine is a numerical control milling machine using a small cutter and a high-power and high-speed spindle motor. The engraving machine processes the product, firstly, a mechanism for assisting processing is manufactured according to the technological requirements and characteristics of the product to be processed, then the product to be processed is fixed on a workbench of the engraving machine through the assisting processing mechanism, and then the product to be processed is processed.

At present, the optical element of VR/AR project has higher requirements on processing precision and appearance, and the processing process is required to support the product and avoid the optical area. Therefore, there is an urgent need to design a precise pressing mechanism which can realize the positioning of the optical area of the product without scratching, and is used for removing the material handle of the optical element by the engraving and milling machine.

Disclosure of Invention

An object of the present application is to provide a new technical scheme of an attaching mechanism and an engraving and milling machine.

According to a first aspect of the present application, a press attachment mechanism is provided. The pressing and attaching mechanism comprises a pressing device and a positioning device; the compressing device comprises a driving part and a floating device, wherein the floating device is arranged at the driving end of the driving part and is positioned above the positioning device; the floating device comprises a floating joint fixing plate, a floating joint, a guide column, a cover plate and a guide pin; the floating joint fixing plate is arranged at the driving end of the driving part, the floating joint is movably connected with the floating joint fixing plate, the cover plate is connected with the floating joint, the guide column is arranged on one of the floating joint and the floating joint fixing plate, the other one of the floating joint and the floating joint fixing plate is provided with a guide groove, the guide column is positioned in the guide groove, the transverse dimension of the guide groove is larger than that of the guide column, and the guide pin is arranged on the cover plate; the positioning device is arranged below the cover plate, a positioning hole is formed in the positioning device, and the guide pin is matched with the positioning hole in a positioning mode.

Optionally, the floating device further comprises a connecting column; the connecting column comprises a first connecting column, a second connecting column and a third connecting column, wherein the first connecting column, the second connecting column and the third connecting column are sequentially and longitudinally connected, the frontal diameter of the first connecting column is smaller than that of the second connecting column, the diameter of the second connecting column is smaller than that of the third connecting column, the height of the third connecting column is smaller than that of the second connecting column, the first connecting column is connected with the floating joint fixing plate, the bottom of the third connecting column is arc-shaped, and the third connecting column is located in the floating joint.

Optionally, the floating joint includes first semicircle portion and second semicircle portion, the straight flange of first semicircle portion with the straight flange of second semicircle portion sets up relatively, first semicircle portion with second semicircle portion respectively with the apron is connected, at least one arc border department in first semicircle portion with second semicircle portion is equipped with the guide way, first semicircle portion with second semicircle portion encloses into and holds the chamber, first semicircle portion with second semicircle portion forms with hold the through-hole of chamber intercommunication, third spliced pole joint is in hold the intracavity, the second spliced pole is followed the through-hole stretches out.

Optionally, a surface of the third connecting post opposite to the cover plate is an arc surface.

Optionally, the cover plate is higher than the cover plate at the side far away from the driving part.

Optionally, one end of the guide pin is provided with a transition part, the radial dimension of the transition part gradually increases from a position close to the end face of the guide pin to a position far away from the end face of the guide pin, and the inner diameter of the positioning hole close to the opening part is matched with the maximum radial dimension of the guide pin.

Optionally, the guide pin includes a first positioning pin and a second positioning pin, and the first positioning pin and the second positioning pin are uniformly distributed with respect to the lower surface of the cover plate.

Optionally, the positioning device comprises a positioning block fixing plate and a product positioning block, wherein the product positioning block is arranged on the positioning block fixing plate, and the product positioning block is arranged below the cover plate.

Optionally, the product positioning block comprises an avoidance groove, and is arranged on the product positioning block; the material handle mouth set up in dodge groove one end, the material handle mouth set up in dodge the groove keep away from one side of cylinder backup pad.

Optionally, the product locating hole includes a plurality of dodge the groove, adjacent dodge and be provided with the interval portion between the groove the interval portion and dodge the groove with the opposite edge of interval portion is provided with the opening.

According to a first aspect of the present application, there is provided an engraving and milling machine. The engraving and milling machine comprises the pressing mechanism.

According to one embodiment of the disclosure, the air cylinder drives the floating joint to compress the cover plate and further compress the product, so that the product compressing function is realized. Through the dual positioning of the pressing device and the positioning device, the optical element is roughly positioned firstly and then finely positioned, and the damage to the product caused by direct fine positioning and uneven pressing is avoided. Other features of the present application and its advantages will become apparent from the following detailed description of exemplary embodiments of the present application, which proceeds with reference to the accompanying drawings.

Drawings

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

Fig. 1 is a schematic structural view of an embodiment of the present application.

Fig. 2 is a schematic view of a compacting apparatus according to an embodiment of the present application.

Fig. 3 is another schematic view of a compression device according to an embodiment of the present application.

Fig. 4 is a schematic side view in cross-section of a compression device according to an embodiment of the present application.

Fig. 5 is a bottom view of a floating joint and connection post connection state according to an embodiment of the present application.

FIG. 6 is a schematic cross-sectional view of a connecting column according to an embodiment of the present application

Fig. 7 is a schematic view of a positioning device according to an embodiment of the present application.

Fig. 8 is an enlarged schematic view of a product positioning block according to an embodiment of the present application.

Fig. 9 is a schematic view of a guide pin according to an embodiment of the present application.

In the figure, 1-a compressing device; 11-a driving part; 12-a floating device; 121-floating joint fixing plate; 122-floating joint; 1221-a first semicircle; 1222-a second semicircle; 123-guide posts; 124-cover plate; 125-guide pins; 1251-first positioning pins; 1252-second locating pins; 1253-transition; 126-guide slots; 127-connecting column; 1271-first connecting post; 1272-a second connecting post; 1273-third connecting column; 2-positioning means; 21-positioning holes; 22-positioning block fixing plates; 23-a product positioning block; 231-avoidance slot; 232-a material handle opening; 233-opening.

Detailed Description

Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise.

The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application, its application, or uses.

Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of exemplary embodiments may have different values.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

The embodiment of the application provides a press attachment mechanism. The pressing mechanism comprises a pressing device 1 and a positioning device 2. The compressing device 1 comprises a driving part 11 and a floating device 12. The floating device 12 is disposed at the driving end of the driving part 11, and the floating device 12 is located above the positioning device 2. The floating device 12 includes a floating joint fixing plate 121, a floating joint 122, a guide post 123, a cover plate 124, and a guide pin 125. Wherein the floating joint fixing plate 121 is disposed at the driving end of the driving part 11. The floating joint 122 is movably connected with the floating joint fixing plate 121. The cover plate 124 is connected to the floating joint 122. The guide post 123 is provided on one of the floating joint 122 and the floating joint fixing plate 121. A guide groove 126 is provided on the other of the floating joint 122 and the floating joint fixing plate 121. The guide post 123 is positioned in the guide groove 126. The lateral dimension of the guide groove 126 is greater than the lateral dimension of the guide post 123. The guide pin 125 is disposed on the cover plate 124. The positioning device 2 is arranged below the cover plate 124. The positioning device 2 is provided with a positioning hole 21. The guide pin 125 is in positioning engagement with the positioning hole 21.

As shown in fig. 1 to 2, in use, the driving part 11 drives the floating device 12 to move upwards so as to separate the floating device 12 from the positioning device 2. The optical element is placed on the positioning device 2. The driving part 11 drives the floating device 12 to move downwards. The float device 12 cooperates with the positioning device 2 to compress the optical element. The machining device cuts the optical element to remove the stock. After the machining is finished, the driving part 11 drives the floating device 12 to move upwards so as to separate the floating device 12 from the positioning device 2. The cut optical element is taken out and the processing is completed.

As shown in fig. 2 to 5, the floating joint 122 is movably connected with the floating joint fixing plate 121, and the guide groove 126 has a size larger than that of the guide post 123, so that the floating joint 122 has a predetermined gap. During the pressing down motion, when the optical element is not positioned properly, the floating joint 122 can be rotated through the clearance gap to fine tune the position of the optical element. Upon continued depression, the guide pins 125 enter the positioning holes 21, precisely positioning the cover plate 124 with the positioning device 2 such that the cover plate 124 compresses the optical element located on the positioning device 2. During the precise positioning process, the position of the floating joint 122 is corrected. The floating joint 122 carries the position of the optical element to be corrected.

The floating device 12 and the positioning device 2 are matched to finish the pressing action, and the mode of coarse positioning and then fine positioning is adopted, so that the risk that the optical element is crushed by the pressing mechanism due to the position deflection of the optical element when the fine positioning pressing is directly adopted is avoided.

In one example, the float 12 further includes a connecting post 127. The attachment post 127 includes a first attachment post 1271, a second attachment post 1272, and a third attachment post 1273. The first, second and third connecting

columns

1271, 1272 and 1273 are sequentially connected longitudinally. The diameter of the first connection post 1271 is smaller than the diameter of the second connection post 1272. The second attachment post 1272 has a diameter that is smaller than the diameter of the third attachment post 1273. The third connecting post 1273 has a height that is less than the height of the second connecting post 1272. The first connection column 1271 is connected to the floating joint fixing plate 121. The bottom of the third connecting column 1273 is arc-shaped. The third connection post 1273 is positioned within the floating joint 122.

As shown in fig. 6, the connecting column 127 is formed by connecting three sections of columns, and the connecting column 127 has a diameter sequentially increasing from top to bottom for connecting the floating joint fixing plate 121 and the floating joint 122. For example, the columns are cylinders, prisms, etc. The first attachment post 1271 is threaded on the outer surface. The floating joint fixing plate 121 is provided with a screw hole which is in screw-fit with the outer surface of the first connecting column 1271. The top of the connecting column 127 is in threaded connection with the floating joint fixing plate 121. The floating connector 122 is sleeved on the third connecting column 1273, so that the floating connector 122 is movably connected with the floating connector fixing plate 121.

In one example, the floating joint 122 includes a first semi-circular portion 1221 and a second semi-circular portion 1222. The straight edge of the first semicircle part 1221 and the straight edge of the second semicircle part 1222 are disposed opposite to each other. The first semicircular portion 1221 and the second semicircular portion 1222 are connected to the cover plate 124, respectively. The guide groove 126 is provided at least one arc edge of the first semicircle part 1221 and the second semicircle part 1222. The first semicircular portion 1221 and the second semicircular portion 1222 enclose a receiving cavity. The first and second semicircular parts 1221 and 1222 form a through hole communicating with the receiving chamber. The third connecting post 1273 is snapped into the receiving cavity. The second connection post 1272 protrudes from the through hole.

As shown in fig. 4 and 6, the receiving cavity at the center of the floating joint 122 has a convex shape in cross section. The second connecting pillar 1272 and the third connecting pillar 1273 have a convex cross section. The first and

second semicircle portions

1221 and 1273 enclose the bottom of the second connecting column 1272 and the third connecting column 1273 in the receiving chamber, so that the floating joint 122 is connected to the floating joint fixing plate 121 and the floating joint 122 is rotatable.

As shown in fig. 4 to 5, the top of the connection post 127 is screw-coupled with the floating joint fixing plate 121 while the guide groove 126 on the floating joint 122 corresponds to the guide post 123 such that the guide post 123 is positioned in the guide groove 126. The float device 12 is installed.

A guide post 123 is provided on the lower surface of the floating joint fixing plate 121, and a guide groove 126 matching the guide post 123 is provided at the arc-shaped edge of the first semicircular portion 1221 or the second semicircular portion 1222 of the floating joint 122.

Alternatively, the guide post 123 is provided at the arc edge of the first or second semicircular portion 1221 or 1222 of the floating joint 122, and the guide groove 126 matched with the guide post 123 is provided at the lower surface of the floating joint fixing plate 121. For example, the guide groove 126 is U-shaped, and the radial dimension of the guide groove 126 is larger than the radial dimension of the guide post 123. The guide groove 126 and the guide post 123 are fixed in relative positions on the floating joint fixing plate 121, and the floating joint 122 is roughly positioned with a certain relative movement amount by reserving a gap. During the descending process, when the positions of the optical elements are not properly arranged, the rotation angle of the cover plate 124 can be finely adjusted through the floating joint 122, so that coarse positioning is realized.

In one example, the surface of the third connecting post 1273 opposite the cover plate 124 is curved.

As shown in fig. 6, third attachment post 1273 is positioned within the receiving cavity of floating joint 122. The bottom surface of the third connecting pole 1273 is arc-shaped. The arcuate bottom surface may increase the clearance of floating joint 122 as compared to being planar. The increased clearance facilitates coarse positioning of the optical element by the floating connector 122 driving the cover plate 124.

In one example, the cover plate 124 has a greater height on the side closer to the driving portion 11 than on the side farther from the driving portion 11 than the cover plate 124.

As shown in fig. 1 to 4, the side of the cover plate 124 away from the driving portion 11 is the side close to the processing apparatus. In this way, damage to the cover plate 124 by the processing equipment can be effectively avoided.

In one example, one end of the guide pin 125 has a transition 1253. The radial dimension of the transition 1253 increases gradually from a position near the end face of the guide pin 125 to a position away from the end face of the guide pin. The inner diameter of the positioning hole 21 near the opening portion matches the maximum radial dimension of the guide pin 125.

As shown in fig. 4 and 9, for example, transition 1253 of guide pin 125 is tapered or cambered. In the pressing process, after the cover plate 124 is driven by the floating joint 122 to perform coarse positioning, the guide pin 125 descends and is inserted into the positioning hole 21. The tapered or arcuate end facilitates entry of guide pin 125 into locating hole 21. When the conical or arc-shaped tail end falls into the positioning hole 21, a transition process is formed for converting coarse positioning into fine positioning, and the optical element is prevented from being crushed by errors caused by direct coarse positioning inaccuracy.

In one example, the guide pin 125 includes a first detent pin 1251 and a second detent pin 1252. The first and second positioning pins 1251 and 1252 are uniformly distributed with respect to the lower surface of the cover plate 124.

As shown in fig. 2, a guide pin 125 is provided at the lower surface edge of the cover plate 124. And the first and second positioning pins 1251 and 1252 are positioned at opposite corners of the lower surface of the cover plate 124. The positioning accuracy is facilitated by providing a plurality of guide pins 125.

In one example, the positioning device 2 includes a positioning block fixing plate 22 and a product positioning block 23. The product positioning block 23 is disposed on the positioning block fixing plate 22. The product positioning block 23 is disposed below the cover plate 124.

As shown in fig. 7, the product positioning block 23 and the positioning block fixing plate 22 are both rectangular parallelepiped. The product positioning block 23 is provided on the positioning block fixing plate 22. The product positioning block 23 and the positioning block fixing plate 22 are positioned by cylindrical pins. The product positioning block 23 is located below the cover plate 124 and corresponds to the position of the cover plate 124. The air cylinder drives the floating joint 122 to press the cover plate 124, the distance between the product positioning block 23 and the cover plate 124 is reduced, and the optical element is pressed, so that the product pressing function is realized.

In one example, the product positioning block 23 includes a relief groove 231. The avoiding groove 231 is disposed on the product positioning block 23. The handle opening 232 is disposed at one end of the avoiding groove 231. The handle opening 232 is disposed at a side of the avoiding groove 231 away from the cylinder support plate.

As shown in fig. 7 to 8, the escape groove 231 on the product positioning block 23 corresponds to the escape groove position of the lower surface of the cover plate 124 for escaping the optical area of the optical element. The positioning holes 21 correspond to the positions of the guide pins 125 on the lower surface of the cover plate 124, and are used for guiding and positioning the cover plate 124. The handle opening 232 is used for placing the optical element at a position to be processed, so that processing equipment can process the optical element conveniently.

As shown in fig. 8, an inclined surface is provided at the top edge of the escape groove 231. The top of the avoidance groove 231 is provided with a supporting surface on the inclined surface, and the supporting surface is used for supporting the skirt edge of the product. The side surface of the supporting surface is a profiling surface, and the profiling surface is used for positioning the circumference of the product.

The avoidance groove on the lower surface of the cover plate 124 corresponds to the avoidance groove 231 on the product positioning block 23. The avoidance groove is arranged to avoid the optical area is scratched for design. The part of the supporting surface, which is close to the avoiding groove 231, is designed to be an inclined surface, so that the product skirt edge is prevented from being scratched, linear contact is realized, and the scratching probability is successfully reduced. The technical requirement prescribes that the supporting surface is polished to a mirror surface, the roughness requirement is 0.4, and zero scratch of the product is realized.

In one example, the product positioning hole 21 includes a plurality of the escape grooves 231. A spacer is provided between the adjacent escape grooves 231. A notch 233 is provided on the side of the spacer and the side of the escape groove 231 opposite to the spacer.

As shown in fig. 8, the notch 233 is provided on both sides of the escape groove 231. Three avoiding grooves 231 are arranged on the product positioning block 23. The gaps 233 in the space between adjacent ones of the escape grooves 231 communicate. The notch 233 is provided to facilitate the handling of the optical element.

As shown in fig. 1 and 7, three avoidance grooves 231 are provided on the product positioning block 23, and the same number of pressing devices are provided at positions corresponding to the three avoidance grooves 231. The multiple products are pressed and attached once, and simultaneously the multiple products are processed, so that the working efficiency is improved, and the labor intensity is reduced.

In one example, the driving part 11 includes a cylinder, a cylinder support plate, and a cylinder connection plate. The cylinder is connected to the cylinder support plate. The cylinder connecting plate is connected with the cylinder driving end. The floating joint fixing plate 121 is connected to the top of the cylinder connecting plate side surface by bolts and reinforcing ribs. The cylinder drives the cylinder connecting plate to move through the cylinder, and then drives the floating device 12 to move up and down.

As shown in fig. 1, the cylinder is fixedly connected with the cylinder connecting plate through a pin and a bolt. The top of the side surface of the air cylinder connecting plate is connected with the top of the side surface of the reinforcing rib through bolts. The floating joint fixing plate 121 is connected to the lower surface of the reinforcing rib by bolts. Thereby connecting the floating joint fixing plate 121 with the cylinder connecting plate. The top of the side surface of the air cylinder connecting plate is connected with the top of the side surface of the reinforcing rib through bolts. The floating joint fixing plate 121 is connected to the lower surface of the reinforcing rib by bolts. Thereby connecting the floating joint fixing plate 121 with the cylinder connecting plate.

In one example, the connection device further includes a locating block connection block. The locating block connecting block is arranged on the workbench. The bottom of the positioning block connecting block is connected with the upper surface of the workbench. The upper surface of the positioning block connecting block is connected with the bottom of the positioning block fixing plate 22.

As shown in fig. 7, the product positioning block 23 and the positioning block fixing plate 22 are positioned by cylindrical pins, are tightly connected by bolts, and are connected to the positioning block fixing block by positioning pins and bolts. The positioning block fixing connecting block is positioned with the workbench through a pin and is connected with the workbench through a bolt. When the types of the optical elements to be processed are different or other products are processed, the product positioning block 23 and the positioning block fixing plate 22 can be taken down, and the positioning device 2 with the required type can be replaced to be connected with the positioning block connecting block, so that the pressing and attaching tool is suitable for products with various types.

In one example, the control device includes a vacuum generator and a reversing valve. The vacuum generator and the reversing valve are both arranged on the workbench. The reversing valve, the air cylinder and the vacuum generator are respectively connected through an air inlet pipe.

As shown in fig. 1, the vacuum generator and the reversing valve are disposed on the same side of the upper surface of the table. The reversing valve, the air cylinder and the vacuum generator are connected through an air pipe, the vacuum generator provides power for the air cylinder, and the reversing valve controls the air inlet switch of the air cylinder, so that the action end of the air cylinder is controlled to lift, and the lifting of the pressure attachment device is controlled.

In this embodiment, the press attachment mechanism in the cnc engraving machine implements the scheme of coarse positioning, fine positioning and press attachment of the product after the guide pin 125 by using the floating joint 122, compared with the prior art. The relative position fine positioning of the cover plate 124 and the profiling base is realized through double positioning. The product positioning is performed by using profiling contour positioning, the product support is inclined, the product processing precision is improved, the appearance is ensured by avoiding the optical area, and the yield and the working efficiency of the product appearance are improved.

In one example, the operating steps of the engraving and milling machine include:

the first step: opening the air inlet switch, and lifting the cover plate 124 by the movement of the air cylinder, so that the optical element is placed into the profiling cavity of the product positioning block 23;

and a second step of: rotating the reversing valve, and driving the cover plate 124 to move downwards by the movement of the air cylinder to compress the product;

and a third step of: starting the engraving and milling machine, and sequentially cutting off the material handles of the products;

fourth step: rotating the reversing valve, and driving the cover plate 124 to move upwards by the air cylinder to take out the product;

fifth step: closing the air inlet switch, closing the engraving and milling machine, and ending the processing.

The mechanism has the advantages of accurate positioning, simple structure, convenient operation, applicability to different operation environments and strong universality.

Although specific embodiments of the present application have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present application. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the present application. The scope of the application is defined by the appended claims.

Claims

1. The pressing mechanism is characterized by comprising a pressing device (1) and a positioning device (2);

the compressing device (1) comprises a driving part (11) and a floating device (12), wherein the floating device (12) is arranged at the driving end of the driving part (11), and the floating device (12) is positioned above the positioning device (2);

the floating device (12) comprises a floating joint fixing plate (121), a floating joint (122), a guide column (123), a cover plate (124) and a guide pin (125);

the floating connector fixing plate (121) is arranged at the driving end of the driving part (11), the floating connector (122) is movably connected with the floating connector fixing plate (121), the cover plate (124) is connected with the floating connector (122), the guide post (123) is arranged on one of the floating connector (122) and the floating connector fixing plate (121), the guide groove (126) is arranged on the other one of the floating connector (122) and the floating connector fixing plate (121), the guide post (123) is positioned in the guide groove (126), the transverse dimension of the guide groove (126) is larger than that of the guide post (123), and the guide pin (125) is arranged on the cover plate (124);

the positioning device (2), the positioning device (2) set up in apron (124) below be provided with locating hole (21) on the positioning device (2), guide pin (125) with locating hole (21) location cooperation.

2. The press attachment mechanism of claim 1, wherein the float device (12) further comprises a connecting post (127);

the connecting column (127) comprises a first connecting column (1271), a second connecting column (1272) and a third connecting column (1273), wherein the first connecting column (1271), the second connecting column (1272) and the third connecting column (1273) are sequentially connected longitudinally, the frontal diameter of the first connecting column (1271) is smaller than that of the second connecting column (1272), the diameter of the second connecting column (1272) is smaller than that of the third connecting column (1273), the height of the third connecting column (1273) is smaller than that of the second connecting column (1272), the first connecting column (1271) is connected with the floating joint fixing plate (121), the bottom of the third connecting column (1273) is arc-shaped, and the third connecting column (1273) is located in the floating joint (122).

3. The attachment mechanism of claim 2, wherein the floating joint (122) includes a first semicircular portion (1221) and a second semicircular portion (1222), the straight edge of the first semicircular portion (1221) and the straight edge of the second semicircular portion (1222) are disposed opposite to each other, the first semicircular portion (1221) and the second semicircular portion (1222) are respectively connected with the cover plate (124), the guide slot (126) is disposed at least one arc edge of the first semicircular portion (1221) and the second semicircular portion (1222), the first semicircular portion (1221) and the second semicircular portion (1222) enclose a receiving cavity, the first semicircular portion (1221) and the second semicircular portion (1222) form a through hole communicating with the receiving cavity, and the third connecting post (1273) is clamped in the receiving cavity, and the second connecting post (2) protrudes from the through hole.

4. A press attachment mechanism as claimed in claim 3, wherein the surface of the third connecting post (1273) opposite the cover plate (124) is cambered.

5. The press attachment mechanism according to claim 1, wherein the cover plate (124) has a height on a side closer to the driving portion (11) that is greater than a height on a side of the cover plate (124) farther from the driving portion (11).

6. The press attachment mechanism according to claim 1, wherein one end of the guide pin (125) has a transition portion (1253), a radial dimension of the transition portion (1253) gradually increases from a position near an end surface of the guide pin (125) to a position away from the end surface of the guide pin (125), and an inner diameter of the positioning hole (21) near an opening portion matches a maximum radial dimension of the guide pin (125).

7. The press attachment mechanism of claim 1, wherein the guide pins (125) comprise first (1251) and second (1252) alignment pins, the first (1251) and second (1252) alignment pins being evenly distributed relative to the lower surface of the cover plate (124).

8. The press attachment mechanism according to claim 1, wherein the positioning device (2) comprises a positioning block fixing plate (22) and a product positioning block (23), the product positioning block (23) is arranged on the positioning block fixing plate (22), and the product positioning block (23) is arranged below the cover plate (124).

9. The press attachment mechanism according to claim 8, wherein the product positioning block (23) comprises:

the avoiding groove (231) is arranged on the product positioning block (23);

the material handle opening (232) is arranged at one end of the avoidance groove (231), and the material handle opening (232) is arranged at one side of the avoidance groove (231) away from the driving part (11).

10. The attaching mechanism as defined in claim 9, wherein said positioning hole (21) includes a plurality of said escape grooves (231), a spacer portion is provided between adjacent ones of said escape grooves (231), and a notch (233) is provided on an opposite side of said spacer portion to said escape groove (231) from said spacer portion.

11. An engraving and milling machine comprising a press attachment mechanism as claimed in any one of claims 1 to 10.