CN216989964U

CN216989964U - Cover body mounting hole expanding mechanism

Info

Publication number: CN216989964U
Application number: CN202220431687.4U
Authority: CN
Inventors: 彭龙; 汪晓波; 郑瑞祺
Original assignee: Hangzhou Freetron Industrial Co Ltd
Current assignee: Hangzhou Freetron Industrial Co Ltd
Priority date: 2022-02-28
Filing date: 2022-03-01
Publication date: 2022-07-19
Anticipated expiration: 2032-03-01
Also published as: CN114669982A; CN217551679U; CN114505670B; CN216990689U; CN114505670A; CN114669982B

Abstract

The utility model discloses a cover body mounting hole expanding mechanism which comprises a reaming boss, a reaming pin and a reaming driving piece, wherein the reaming boss is positioned on a supporting seat of a press-in structure and used for placing a cup cover; the reaming pins are provided with at least two reaming pins which respectively penetrate through the reaming channels; the reaming driving piece comprises at least two connecting arms which are connected with the reaming pin and positioned in the moving channel, and an air claw connected with the lower part of each connecting arm; when the air claw drives the connecting arm to move transversely along the moving channel, the connecting arm synchronously drives the reaming pin to move transversely along the reaming channel. The cup cover expanding mechanism can enlarge the cup cover mounting hole, is convenient for the connecting piece to be mounted on the cup cover mounting hole, avoids the situation that the connecting piece cannot be clamped and connected or is not mounted in place, improves the working efficiency and improves the stability of the connecting piece during assembly.

Description

Cover body mounting hole expanding mechanism

Technical Field

The utility model relates to the technical field of production equipment, in particular to a cover body mounting hole expanding mechanism.

Background

The bowl cover is formed by the assembly of a plurality of structures such as hardware on upper cover, lower cover, handle, the handle usually, and current bowl cover needs the manual work to punch installation hardware and handle during the assembly usually by manual assembly, and the operation is wasted time and energy, and work efficiency is not high. Along with the development of modern industry, the mode that semi-automatization manual work participated is mostly adopted in current bowl cover assembly, still has machining efficiency to hang down and the higher problem of cost of labor, and certainly some current bowl cover assemblies also have the mode of adopting full automatization, and assembly line operation is carried out by a plurality of stations usually in the assembly of bowl cover, and the hardware on the bowl cover can automatic assembly in the pinhole of bowl cover, improves work efficiency and effectively alleviates workman's intensity of labour.

The prior art discloses a cup cover assembly machine (Chinese patent number: CN202110400926.X), which comprises: a frame; the conveying device is arranged on the rack, a jig is arranged on the conveying device, the jig is used for placing the middle cover and the upper cover and enabling a first pin hole of the middle cover to be aligned with a second pin hole of the upper cover, and the conveying device is used for enabling the jig to move back and forth between a feeding station and an assembling station; the pin rod assembling device is arranged on the rack and corresponds to an assembling station, and is used for inserting the pin rod into the first pin hole of the middle cover and the second pin hole of the upper cover on the assembling station; and the pin rod feeding device is arranged on the rack and used for storing and supplying the pin rods to the pin rod assembling device.

Although the pin rod can be automatically assembled in the pin hole of the cup cover, the assembly efficiency is effectively improved, but the pin hole expanding mechanism is not arranged in the utility model, so that the situation that the pin rod is not installed in place or cannot be installed and clamped in the pin hole is easily caused when the pin rod is installed if the hole diameter of the pin hole is set to be too small, and the pin rod is easily separated out of the pin hole if the hole diameter of the pin hole is set to be too large.

Disclosure of Invention

Aiming at the defects in the prior art, the utility model provides the cover body mounting hole expanding mechanism which can effectively expand the cup cover mounting hole, is convenient for the mounting of a connecting piece on the cup cover mounting hole, avoids the situation that the connecting piece cannot be clamped and connected or is not mounted in place, improves the working efficiency and improves the stability of the connecting piece during the assembly.

In order to solve the technical problem, the utility model is solved by the following technical scheme:

a cover mounting hole expanding mechanism comprising:

the hole expanding boss is positioned on the supporting seat of the press-in structure and used for placing the cup cover, a moving channel which is transversely arranged is arranged in the middle of the hole expanding boss, and hole expanding channels which are transversely arranged and communicated with the moving channel are arranged on two sides of the hole expanding boss;

at least two reaming pins are arranged and respectively penetrate through the reaming channels;

the reaming driving piece comprises at least two connecting arms which are connected with the reaming pin and positioned in the moving channel and an air claw connected below the connecting arms; when the air claw drives the connecting arm to move transversely along the moving channel, the connecting arm synchronously drives the reaming pin to move transversely along the reaming channel.

Preferably, the reaming boss comprises a first boss part and a second boss part which can be separated from each other, and the mutually far sides of the first boss part and the second boss part are respectively provided with the reaming channel.

Preferably, the mutually approaching sides of the first boss portion and the second boss portion are recessed to form a first notch and a second notch, respectively, and the first notch and the second notch surround to form the moving channel.

Preferably, the lateral length of the reaming pin is greater than that of the reaming channel, one end of the reaming pin penetrates through the reaming channel to the outside, and the other end of the reaming pin is located in the moving channel and connected with one side of the connecting arm.

Preferably, the connecting arm longitudinally penetrates through the reaming channel, a connecting hole transversely arranged is formed in the upper portion of the connecting arm, and one end, close to the connecting arm, of the reaming pin is clamped in the connecting hole.

Preferably, the gas claw is including driving actuating cylinder, being located the fixing base that drives actuating cylinder top and being located the fixing base top and with two at least driving pieces that the linking arm links to each other, the upper end of fixing base is provided with the drive groove that supplies the driving piece along lateral motion.

Preferably, the driving member comprises a driving block located in the driving groove and a driving arm connected with the connecting arm; when the driving block transversely moves along the driving groove, the driving block synchronously drives the driving arm and drives the connecting arm to transversely move along the moving channel.

Preferably, the lower portion of each connecting arm is further provided with a clamping groove for clamping and connecting the driving arms, and the two clamping grooves are respectively located on the sides, far away from each other, of the two connecting arms.

Preferably, the rotary table further comprises a transfer table bottom plate for supporting the reaming boss, a bottom plate channel for the connecting arm to penetrate and move is arranged on the transfer table bottom plate, and the bottom plate channel is transversely arranged and communicated with the moving channel.

Preferably, the gas claw further comprises a cylinder fixing plate, one side of the cylinder fixing plate is fixedly connected with the driving cylinder, and the upper end of the cylinder fixing plate is fixedly connected with the bottom plate of the transfer table.

The utility model mainly obtains the following beneficial effects:

in the utility model, when the reaming pin expands the cup cover mounting hole, the air claw drives the connecting arm to transversely move along the moving channel, and the connecting arm synchronously drives the reaming pin to transversely move along the reaming channel, so that the cup cover mounting hole is expanded, and hardware such as a connecting piece and the like can be conveniently installed. Compared with some existing cup cover assembling devices, the cup cover assembling device is not provided with the pin hole expanding mechanism, so that if the hole diameter of the pin hole is too small, the situation that the pin rod is not installed in place or cannot be installed and clamped in the pin hole is easily caused when the pin rod is installed, and if the hole diameter of the pin hole is too large, the pin rod is easily separated from the pin hole.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the utility model and together with the description serve to explain the utility model without limiting the utility model. In the drawings:

fig. 1 is an overall schematic view of an expanding mechanism disclosed in an embodiment of the present invention.

FIG. 2 is a schematic view of a reamer pin and reamer drive as disclosed in one embodiment of the present invention.

Fig. 3 is a schematic view of a reaming boss according to an embodiment of the disclosure.

Fig. 4 and 5 are schematic diagrams illustrating an overview of a lid attachment mechanism disclosed in an embodiment of the present invention.

Fig. 6 is a schematic view of a press-in structure according to an embodiment of the present invention.

Fig. 7 is an exploded view of a press-in structure according to an embodiment of the present invention.

Fig. 8 is a schematic view of a pressing member disclosed in an embodiment of the present invention.

Fig. 9 is a schematic view of a dam member according to an embodiment of the disclosure.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the utility model without any inventive step, are within the scope of protection of the utility model.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. "beneath," "under" and "beneath" a first feature includes the first feature being directly beneath and obliquely beneath the second feature, or simply indicating that the first feature is at a lesser elevation than the second feature.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the description and claims of the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one.

As shown in fig. 1 to 9, as a first embodiment of the present invention, a lid body mounting hole expanding mechanism is disclosed, which is mainly used for expanding a mounting hole on a lid body, so as to facilitate installation of hardware such as a plug pin and a connecting piece into the mounting hole. The cover body mounting hole expanding mechanism mainly comprises a reaming boss 61, a reaming pin 62 and a reaming driving piece 63, wherein the reaming boss 61 is positioned on a supporting seat of the press-in structure and used for placing a cup cover, a moving channel 601 arranged along the transverse direction is arranged in the middle of the reaming boss 61, and reaming channels 602 arranged along the transverse direction and communicated with the moving channel 601 are arranged at two sides of the reaming boss 61; the reaming pins 62 are provided with at least two and respectively penetrate through the reaming channels 602; reaming actuator 63 includes at least two coupling arms 631 connected to reaming pin 62 and positioned within travel path 601, and a pneumatic ram 632 connected below coupling arms 631. Consequently, in the actual operation process, when reaming round pin 62 expands the bowl cover mounting hole, gas claw 632 forerunner makes linking arm 631 carry out transverse motion along removal passageway 601, and linking arm 631 synchronous drive reaming round pin 62 carries out transverse motion along reaming passageway 602 to expand the bowl cover mounting hole, so that the installation of hardware such as connecting piece. Compared with some existing cup cover assembling devices, the cup cover assembling device is not provided with the pin hole expanding mechanism, so that if the hole diameter of the pin hole is too small, the situation that the pin rod is not installed in place or cannot be installed and clamped in the pin hole is easily caused when the pin rod is installed, and if the hole diameter of the pin hole is too large, the pin rod is easily separated from the pin hole.

As another embodiment of the present invention, the reaming boss 61 includes a first boss portion 611 and a second boss portion 612 that are separable from each other, and the mutually distant sides of the first boss portion 611 and the second boss portion 612 are respectively provided with the reaming passage 602. As another embodiment of the present invention, the mutually approaching sides of the first and

second boss portions

611 and 612 are recessed to form first and second notches, respectively, which surround the moving passage 601. Therefore, in the present invention, the reaming boss 61 is divided into a first boss portion 611 and a second boss portion 612, and the first boss portion 611 and the second boss portion 612 are recessed to form the moving channel 601, on one hand, to facilitate installation of the reaming pin 62, and on the other hand, to match a cup cover with a larger diameter, when the first boss portion 611 and the second boss portion 612 are close to or abut against each other, the diameter of the whole reaming boss 61 is smaller, a cup cover with a smaller diameter can be placed, and when the first boss portion 611 and the second boss portion 612 are far away from each other, the diameter of the whole reaming boss 61 is larger, a cup cover with a larger diameter can be placed, and therefore, the distance between the first boss portion 611 and the second boss portion 612 can be adjusted according to the size of the cup cover to fit more cup covers.

As another embodiment of the present invention, the lateral length of reamer pin 62 is greater than the length of reamer channel 602, and one end of reamer pin 62 extends through reamer channel 602 to the outside and the other end is located in moving channel 601 and is connected to one side of connecting arm 631 so that the reamer pin extends out of reamer boss 61 into the cup mounting hole. As another embodiment of the present invention, the connecting arm 632 longitudinally penetrates through the enlarged hole channel 602, the upper portion of the connecting arm 632 is provided with a connecting hole arranged along the transverse direction, and one end of the enlarged hole pin 62 close to the connecting arm 631 is clamped in the connecting hole, which is beneficial to enhancing the stability of the structure.

As another embodiment of the present invention, the pneumatic claw 632 includes a driving cylinder 6321, a fixed seat 6322 located above the driving cylinder 6321, and at least two driving members 6323 located above the fixed seat 6322 and connected to the connecting arm 632, and the upper end of the fixed seat 6322 is provided with a driving groove 6324 for the driving members 6323 to move in the transverse direction. As another embodiment of the present invention, the driver 6323 includes a driving block 641 disposed in a driving groove 6324 and a driving arm 642 connected to the connecting arm 631. Therefore, in practical operation, when the hole enlarging pin 62 expands the cup cover mounting hole, the driving cylinder 6321 drives the driving block 641 to firstly move transversely along the driving slot 6324, the driving block 641 synchronously drives the driving arm 642 and drives the connecting arm 631 to move transversely along the moving channel 601, and the driving of the air claw 632 is direct and efficient.

As another embodiment of the present invention, the lower portion of the connecting arm 631 is further provided with two locking slots for locking and connecting the driving arms 642, and the two locking slots are located at the sides of the two connecting arms 631 that are far away from each other, so as to avoid collision of the driving arms 642 during the process that the connecting arms 631 are close to each other, and the structural arrangement is reasonable and reliable. As another embodiment of the present invention, the present invention further includes a transfer table bottom plate 65 for supporting the reaming boss 61, the transfer table bottom plate 65 is provided with a bottom plate passage for the connecting arm 631 to pass through and move, the bottom plate passage is arranged in the transverse direction and is communicated with the moving passage 601, and the transfer table bottom plate 65 is mainly used for supporting the reaming boss 61 or other structural members. As another embodiment of the present invention, the gas claw 632 further includes a cylinder fixing plate, one side of the cylinder fixing plate is fixedly connected to the driving cylinder 6321, and the upper end of the cylinder fixing plate is fixedly connected to the turntable base plate 65, so that the cylinder fixing plate can be used to fix the gas claw 632, thereby preventing the gas claw 632 from shaking during driving, and improving the overall stability.

As another embodiment of the present invention, a cup lid connector mounting mechanism is disclosed, which mainly comprises a supporting seat 701 located on a mounting stand, a hole enlarging structure 600 located above the supporting seat 701 for expanding a cup lid mounting hole, and a press-in structure 800 for pressing a connector into the cup lid mounting hole; the pressing structure 800 comprises a pressing member 81 capable of reciprocating in the transverse direction, a limiting member 82 used for limiting the conveying of the connecting piece and/or limiting the movement of the pressing member 81, and a blocking member 83 used for blocking the connecting piece, wherein a feeding channel 801 arranged in the longitudinal direction and used for conveying the connecting piece is arranged at one end, close to the reaming structure 600, of the pressing member 81, and part or all of the limiting member 82 is located in the feeding channel 801 and can move longitudinally along the feeding channel 801. Therefore, in the present invention, the cup lid connector mounting mechanism is not only provided with the reaming structure 600, which facilitates the mounting of the connector on the cup lid mounting hole to improve the working efficiency and the stability of the connector during assembly, but also the pressing member 81 of the cup lid connector mounting mechanism can move transversely to assemble the connector on one side or both sides of the cup lid, and certainly in other embodiments, the pin hole between the two lid bodies can be assembled with the connector, the application range is wide, and the limiting member 82 can limit the continuous delivery of the connector and the movement of the pressing member 82 under the non-working state, so as to improve the controllability and the stability of the operation of the cup lid connector mounting mechanism.

As another embodiment of the present invention, the pressing member 81 includes a pressing chute 811 located at the upper end of the supporting seat 701, a pressing slider 812 moving relative to the pressing chute 811, and a chute cover 813 located above the pressing chute 812 and used for fixing the pressing slider 812, and one end of the pressing slider 812 away from the hole enlarging structure 600 is provided with a pressing driving member 814 for driving the pressing slider 812 to move transversely and reciprocally. As another embodiment of the present invention, the pressing slider 812 includes a first sliding portion 8121 located in the pressing chute 811, a second sliding portion 8122 connected to one end of the first sliding portion 8121 and connected to the pressing driving member 814, and a third sliding portion 8123 connected to the other end of the first sliding portion 8122 and close to the broaching structure 600; the end of the third sliding portion 8123, which is far away from the first sliding portion 8121, is provided with the feeding channel 801, and the third sliding portion 8123 is further provided with a limiting channel 8120 which is arranged along the longitudinal direction and is used for connecting part of the limiting members 82. Therefore, in the present invention, the pressing driving member 814 is connected to the first sliding portion 8121 and drives the second sliding portion 8122 and the third sliding portion 8123 synchronously, since part of the limiting member 82 is connected to the feeding channel 801 of the third sliding portion 8123, the limiting member 82 and the connecting member in the feeding channel 801 are also driven synchronously, when the connecting member is to be mounted on the mounting hole of the lid, the limiting member 82 moves longitudinally and away from the connecting member, at this time, the pressing member 81 is not restricted by the limiting member 82, the pressing member 81 can move transversely and close to the lid, so that the connecting member is mounted on the lid mounting hole.

As another embodiment of the present invention, the limiting member 82 includes a first limiting bar 821 in the feeding channel 801, a second limiting bar 822 in the limiting channel 8120 and arranged parallel to the first limiting bar 821, and a first plate body and a second plate body respectively located at one end of the first limiting bar 821 and the second limiting bar 822 far away from the connecting member and connected to each other, wherein the first plate body and/or the second plate body end is/are provided with a limiting driving member for driving the first limiting bar 821 and the second limiting bar 822 to reciprocate longitudinally. Therefore, in the present invention, not all the position-limiting members 82 are located in the feeding channel 801, but the position-limiting members are divided into the first position-limiting bars 821 and the second position-limiting bars 822, because in the actual operation process, the first position-limiting bars 821 may be separated from the feeding channel 801 during the longitudinal movement, and the second position-limiting bars 822 may be connected with the third sliding portion 8123 during the longitudinal movement in the position-limiting channel 8120, and further play a role of stabilizing, and prevent the first position-limiting bars 821 from being deviated or separated. As another embodiment of the present invention, a limiting groove 8211 for fixing or limiting the continuous transportation of the connecting element is disposed at one end of the first limiting bar 821 close to the connecting element, and the limiting groove 8211 is formed in a concave manner in the direction of the first plate body and is matched with the connecting element, so in the present invention, the limiting groove 8211 is matched with the connecting element, and the connecting element can be clamped in the limiting groove 8211, thereby limiting the connecting element from continuously moving along the feeding channel 801.

As another embodiment of the present invention, the material blocking member 83 includes a material blocking base 831 located in front of the material pressing slider 812 and close to the inlet of the feeding channel 801, a material blocking plate 832 located above the material blocking base 831, two stoppers 833 perpendicular to the lower side of the material blocking base 831 and capable of reciprocating up and down, and a material blocking driver 834 for driving the stoppers 833 to move; the material blocking base 831 is provided with a material blocking channel 8301 which is longitudinally arranged and communicated with the feeding channel 801 and two lifting channels 8302 which are separately arranged, and the two blocking blocks 833 are respectively positioned in the two material blocking channels 833 and form a restraining area of a restraining connecting piece with the material blocking base 831. In the utility model, the connecting pieces are installed one by one, and the connecting pieces can be mutually connected or abutted in the transmission process, so when the pressing member 81 pushes the first connecting piece, the second connecting piece adjacent to the first connecting piece can also be driven, therefore, the material blocking member 83 can separate the first connecting piece from the second connecting piece, and the first connecting piece is prevented from synchronously driving the second connecting piece.

As another embodiment of the present invention, the front portion of the press-in structure 800 is provided with a sensing member 84 for sensing a connection member, the upper end of the first sliding portion 8121 is provided with a sensing notch 840 for the sensing member 84 to sense the connection member, and the sensing notch 840 is communicated with the feeding channel 801; the sensing member 84 comprises a first sensing support 841, a second sensing support 842 and an optical fiber unit 843, wherein the first sensing support 841 is connected to the supporting seat and positioned on the side of the feeding channel 801, the second sensing support 842 is connected above the first sensing support 841 and can rotate relative to the first sensing support 841, and the optical fiber unit 843 is connected to the second sensing support 842, light of the optical fiber unit 843 can irradiate the sensing notch 840 and sense a connecting piece in the feeding channel 801, so that the connecting piece can be accurately pushed into the cup cover mounting hole, and the phenomenon of deviation of the connecting piece is avoided.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

In summary, the above-mentioned embodiments are only preferred embodiments of the present invention, and all equivalent changes and modifications made in the claims of the present invention should be covered by the claims of the present invention.

Claims

1. The utility model provides a lid mounting hole expanding mechanism which characterized in that includes:

the reaming driving piece comprises at least two connecting arms which are connected with the reaming pin and positioned in the moving channel and an air claw connected below the connecting arms; when the pneumatic claw drives the connecting arm to move transversely along the moving channel, the connecting arm synchronously drives the reaming pin to move transversely along the reaming channel.

2. The cover mounting hole expanding mechanism of claim 1, wherein: the reaming boss comprises a first boss part and a second boss part which can be separated from each other, and the mutually far sides of the first boss part and the second boss part are respectively provided with the reaming channel.

3. The cover mounting hole expanding mechanism of claim 2, wherein: the mutually close sides of the first boss part and the second boss part are respectively concave to form a first notch and a second notch, and the first notch and the second notch surround and form the moving channel.

4. The cover mounting hole expanding mechanism of claim 3, wherein: the lateral length of reaming pin is greater than the length of reaming passageway, one end of reaming pin runs through in reaming passageway to the outside, the other end be located removal passageway and with one side of linking arm links to each other.

5. The cover mounting hole expanding mechanism of claim 4, wherein: the connecting arm vertically runs through in the reaming passageway, the upper portion of connecting arm is provided with along transverse arrangement's connecting hole, on the reaming round pin be close to the one end joint of connecting arm in the connecting hole.

6. The cover mounting hole expanding mechanism of claim 5, wherein: the gas claw is including driving actuating cylinder, being located the fixing base that drives actuating cylinder top and being located the fixing base top and two at least driving pieces that link to each other with the linking arm, the upper end of fixing base is provided with the drive groove that supplies the driving piece along transverse motion.

7. The cover mounting hole expanding mechanism of claim 6, wherein: the driving piece comprises a driving block positioned in the driving groove and a driving arm connected with the connecting arm; when the driving block transversely moves along the driving groove, the driving block synchronously drives the driving arm and drives the connecting arm to transversely move along the moving channel.

8. The cover mounting hole expanding mechanism of claim 7, wherein: the lower part of the connecting arm is also provided with a clamping groove for clamping and connecting the driving arm, and the two clamping grooves are respectively positioned at the sides far away from each other of the two connecting arms.

9. The cover mounting hole expanding mechanism of any one of claims 1-8, wherein: the rotary table further comprises a transfer table bottom plate used for supporting the reaming boss, a bottom plate channel for the connecting arm to penetrate through and move is arranged on the transfer table bottom plate, and the bottom plate channel is transversely arranged and communicated with the moving channel.

10. The cover mounting hole expanding mechanism of claim 9, wherein: the pneumatic claw further comprises a cylinder fixing plate, one side of the cylinder fixing plate is fixedly connected with the driving cylinder, and the upper end of the cylinder fixing plate can be fixedly connected with the bottom plate of the transfer table.