Irregular inner cavity pressure maintaining mechanism

Abstract

The present invention discloses an irregular inner cavity pressure-maintaining mechanism, comprising a frame, a first pressing head assembly and a second pressing head assembly, wherein the first pressing head assembly is arranged on the frame; the second pressing head assembly is arranged on the frame and is arranged in parallel with the first pressing head assembly; wherein the first pressing head assembly and the second pressing head assembly are used to move to a predetermined position and move toward a first direction to extend into the inner cavity of a workpiece, respectively, so as to force the first pressing head assembly to maintain pressure on the arc surface of the inner cavity of the workpiece, and the second pressing head assembly to maintain pressure on the bottom surface and side surface of the inner cavity of the workpiece. The present invention can avoid the generation of bubbles during the pressure-maintaining lamination process, and the lamination is smoother and more compact, thereby improving its safety.

Description

Technical Field

[0001] The invention relates to the technical field of pressure maintenance, and in particular to an irregular inner cavity pressure maintenance mechanism. Background Art

[0002] TWS (True Wireless Stereo) earphones completely abandon the way of wire connection, and the host can work alone, and hands-free calls are at your fingertips. Therefore, the charging box configured with it is also an indispensable part. The charging box of TWS Bluetooth earphones can directly put the Bluetooth earphones into the charging box when charging is needed. It is simple and convenient to use. Therefore, various electrical components such as batteries are equipped in the charging box. In order to improve the safety of charging and discharging of the charging box, flame retardant films and other films are pasted in the inner cavity of the charging box. In related technologies, due to the irregular shape of the inner cavity of the charging box, bubbles are easily generated during the pressure-maintaining and bonding process. Uneven bonding will result in poor tightness, reducing its safety. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, one object of the present invention is to propose an irregular inner cavity pressure maintaining mechanism, comprising:

[0004] frame;

[0005] A first pressing head assembly is arranged on the frame;

[0006] A second pressing head assembly is arranged on the frame and is arranged in parallel with the first pressing head assembly;

[0007] Wherein, the first press head assembly and the second press head assembly are used to move to predetermined positions respectively and move in a first direction to extend into the inner cavity of the workpiece, so as to force the first press head assembly to maintain pressure on the arc surface of the inner cavity of the workpiece, and the second press head assembly to maintain pressure on the bottom and side surfaces of the inner cavity of the workpiece.

[0008] Preferably, according to one embodiment of the present invention, the first press head assembly comprises:

[0009] A first driving group, arranged on the frame;

[0010] A first pressure-maintaining head is connected to the first driving group and is used for being driven by the first driving group to extend into the inner cavity of the workpiece toward the first direction and move along a predetermined angle to be pressed against the inner cavity of the workpiece.

[0011] Preferably, according to one embodiment of the present invention, the first driving group includes:

[0012] A first inclined seat, disposed on the frame and extending obliquely upward toward the first direction;

[0013] A first cylinder, disposed on the first tilting seat;

[0014] A first transmission plate is slidably disposed on the first tilting seat and connected to the first cylinder, and is used to move along a predetermined angle with the first cylinder after the first pressure-maintaining head extends into the inner cavity of the workpiece, so that the first pressure-maintaining head is pressed tightly against the inner cavity of the workpiece;

[0015] A first fixing plate, arranged on the first transmission plate in a horizontal direction, wherein the first fixing plate is slidably connected to the first pressure-maintaining head;

[0016] The second cylinder is disposed on the first fixing plate and connected to the first pressure maintaining head, and is used for driving the first pressure maintaining head to move toward the first direction so as to extend into the inner cavity of the workpiece.

[0017] Preferably, according to one embodiment of the present invention, the first pressure-maintaining head has a first curved surface adapted to the inner cavity of the workpiece, the first curved surface is used to maintain pressure on the curved surface of the inner cavity of the workpiece, and the first curved surface is provided with a first contoured groove, when the first pressure-maintaining head extends into the inner cavity of the workpiece, the first contoured groove is engaged with the inner cavity of the workpiece.

[0018] Preferably, according to one embodiment of the present invention, the second pressure head assembly comprises:

[0019] A second driving group is arranged on the frame;

[0020] A second pressure-maintaining head is connected to the second driving group, and is used for being driven by the second driving group to extend into the inner cavity of the workpiece toward the first direction, and then move along a second preset angle to be pressed against the inner cavity of the workpiece.

[0021] Preferably, according to an embodiment of the present invention, the second drive group comprises:

[0022] A second inclined seat, disposed on the frame and extending downwardly and obliquely toward the first direction;

[0023] a third cylinder, disposed on the second inclined seat;

[0024] a second transmission plate slidably disposed on the second tilting seat;

[0025] A second fixing plate is arranged on the second transmission plate in the horizontal direction and is connected to the second cylinder, and is used to move along a preset angle with the third cylinder after the second pressure-maintaining head extends into the inner cavity of the workpiece, so that the second pressure-maintaining head is pressed tightly against the inner cavity of the workpiece; wherein the second fixing plate is slidably connected to the second pressure-maintaining head;

[0026] The fourth cylinder is disposed on the second fixing plate and connected to the second pressure maintaining head, and is used for driving the second pressure maintaining head to move toward the first direction so as to extend into the inner cavity of the workpiece.

[0027] Preferably, according to one embodiment of the present invention, the second pressure-maintaining head has a second curved surface and a side pressure surface adapted to the inner cavity of the workpiece, the side pressure surface is used to maintain pressure on the side surface of the inner cavity of the workpiece, and the second curved surface is used to maintain pressure on the bottom surface of the inner cavity of the workpiece; wherein, the second curved surface is provided with a second contoured groove, and when the second pressure-maintaining head extends into the inner cavity of the workpiece, the second contoured groove is engaged with the inner cavity of the workpiece.

[0028] Preferably, according to an embodiment of the present invention, a sliding plate sliding along a second direction is provided on the frame, the second direction is horizontally perpendicular to the first direction, and the first pressure head assembly and the second pressure head assembly are arranged on the sliding plate to move to the predetermined position with the sliding plate.

[0029] Preferably, according to one embodiment of the present invention, a screw is provided at the bottom of the frame, and a screw motor is provided at the bottom of the sliding plate to cooperate with the screw transmission, and the screw motor is used to drive the sliding plate to slide along the second direction so that the first pressure head assembly or the second pressure head assembly is driven to the predetermined position.

[0030] Preferably, according to an embodiment of the present invention, the sliding plate has a sensing member extending toward the frame, and the frame is provided with a first trigger member and a second trigger member opposite to each other along the second direction;

[0031] When the first pressing head assembly moves to the predetermined position, the sensing member corresponds to the first trigger member to stop the sliding plate from moving; when the second pressing head assembly moves to the predetermined position, the sensing member corresponds to the second trigger member to stop the sliding plate from moving.

[0032] The irregular inner cavity pressure-maintaining mechanism provided by the present invention can first move the first pressure head assembly to a predetermined position and extend it into the inner cavity of the workpiece during pressure maintaining, thereby maintaining pressure on the arc surface of the inner cavity of the workpiece; and then, after the first pressure head is removed, the second pressure head assembly is moved to a predetermined position and extends it into the inner cavity of the workpiece, thereby maintaining pressure on the bottom and side surfaces of the inner cavity of the workpiece. In this way, bubbles can be avoided from being generated during the pressure-maintaining and bonding process, and the bonding is smoother and tighter, thereby improving its safety.

[0033] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0035] Figure 1 is a schematic structural diagram of an irregular inner cavity pressure maintaining mechanism provided in an embodiment of the present invention;

[0036] Figure 2 is a schematic structural diagram of a first pressing head assembly provided in an embodiment of the present invention;

[0037] Figure 3 is a schematic structural diagram of a first pressure-maintaining head provided in an embodiment of the present invention;

[0038] Figure 4 is a schematic structural diagram of a second pressing head assembly provided in an embodiment of the present invention;

[0039] Figure 5 is a schematic structural diagram of a second pressure-maintaining head provided in an embodiment of the present invention;

[0040] Figure 6 is a schematic structural diagram of a rack provided in an embodiment of the present invention;

[0041] Figure 7 2 is another schematic diagram of the structure of the rack provided in an embodiment of the present invention.

[0042] Description of Figure Numbers:

[0043] 10, frame; 20, first pressure head assembly; 201, first drive group; 2011, first tilting seat; 2012, first cylinder; 2013, first transmission plate; 2014, first fixing plate; 2015, second cylinder; 202, first pressure-maintaining head; 2021, first arc-shaped surface; 2022, first profiling groove; 30, second pressure head assembly; 301, second drive group; 3011, second tilting seat; 30 12. third cylinder; 3013. second transmission plate; 3014. second fixed plate; 3015. fourth cylinder; 302. second pressure-maintaining head; 3021. second arc-shaped surface; 3022. side pressure surface; 3023. second contoured groove; 40. sliding plate; 401. induction member; 402. stop block; 50. screw motor; 501. screw; 60. first trigger member; 70. second trigger member; 80. damper.

[0044] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0045] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but are not to be construed as limiting the present invention. All other embodiments obtained by ordinary technicians in the field without creative work based on the embodiments of the present invention are within the scope of protection of the present invention.

[0046] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “circumferential”, “radial”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0047] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0048] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0050] The irregular inner cavity pressure maintaining mechanism according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0051] Reference Figure 1 and Figure 6 As shown, the irregular inner cavity pressure maintaining mechanism provided by the present invention includes a frame 10, a first press head assembly 20 and a second press head assembly 30, wherein the first press head assembly 20 is arranged on the frame 10; the second press head assembly 30 is arranged on the frame 10 and parallel to the first press head assembly 20; wherein the first press head assembly 20 and the second press head assembly 30 are used to move to predetermined positions respectively and move in a first direction to extend into the inner cavity of the workpiece, so as to force the first press head assembly 20 to maintain pressure on the arc surface of the inner cavity of the workpiece, and the second press head assembly 30 to maintain pressure on the bottom and side surfaces of the inner cavity of the workpiece.

[0052] Among them, a sliding plate 40 that slides along a second direction is provided on the frame 10, and the second direction is horizontally perpendicular to the first direction. The first press head assembly 20 and the second press head assembly 30 are arranged on the sliding plate 40 to move to a predetermined position with the sliding plate 40. It can be understood that the predetermined position can be a position directly opposite to the workpiece, and the first press head assembly 20 and the second press head assembly 30 are arranged parallel to each other along the first direction. When the sliding plate 40 drives the first press head assembly 20 and the second press head assembly 30 to move toward the second direction, the first press head assembly 20 can be moved to the predetermined position or the second press head can be moved to the predetermined position, thereby making the first press head assembly 20 directly face the workpiece or the second press head assembly 30 directly face the workpiece.

[0053] Specifically, the workpiece can be a charging box for wireless headphones. Therefore, the bottom of the inner cavity of the workpiece has a symmetrical curved surface. When the curved surface position is pressurized, the first pressure head assembly 20 can be used to maintain pressure so that the film can be fitted more tightly and have a higher degree of adaptability. It can be understood by those skilled in the art that the workpiece can also be other plastic shells with curved surfaces in the inner cavity.

[0054] The irregular inner cavity pressure maintaining mechanism provided by the present invention can first move the first pressing head assembly 20 to a predetermined position and extend it into the inner cavity of the workpiece during pressure maintaining, thereby maintaining pressure on the arc surface of the inner cavity of the workpiece. After the first pressing head assembly 20 is removed, the second pressing head assembly 30 is moved to a predetermined position and extends it into the inner cavity of the workpiece, thereby maintaining pressure on the bottom and side surfaces of the inner cavity of the workpiece. In this way, bubbles can be avoided during the pressure maintaining and bonding process, and the bonding is smoother and tighter, thereby improving its safety.

[0055] Reference Figures 1 to 3 As shown, the first pressure head assembly 20 includes a first drive group 201 and a first pressure-maintaining head 202. The first drive group 201 is arranged on the frame 10. The first pressure-maintaining head 202 is connected to the first drive group 201, and is used to be driven by the first drive group 201 to extend into the inner cavity of the workpiece in a first direction, and then move along a predetermined angle to be pressed against the inner cavity of the workpiece. The predetermined angle can be 5-10 degrees. By extending the first pressure-maintaining head 202 into the inner cavity of the workpiece and offsetting it by a predetermined angle, the first pressure-maintaining head 202 can be pressed against the inner cavity of the workpiece, so that the film can be pressed more tightly during the pressure-maintaining bonding process.

[0056] Among them, the first driving group 201 includes a first inclined seat 2011 arranged on the frame 10 and extending upwardly in an inclined direction toward a first direction; a first cylinder 2012 is arranged on the first inclined seat 2011; a first transmission plate 2013 is slidably arranged on the first inclined seat 2011 and is connected to the first cylinder 2012, and is used to move along a predetermined angle with the first cylinder 2012 after the first pressure maintaining head 202 extends into the inner cavity of the workpiece, so that the first pressure maintaining head 202 is pressed tightly against the inner cavity of the workpiece; a first fixed plate 2014 is arranged on the first transmission plate 2013 in a horizontal direction, and the first fixed plate 2014 is slidably connected to the first pressure maintaining head 202; a second cylinder 2015 is arranged on the first fixed plate 2014 and is connected to the first pressure maintaining head 202, and is used to drive the first pressure maintaining head 202 to move toward the first direction to extend into the inner cavity of the workpiece.

[0057] In this embodiment, when the arc surface of the inner cavity of the workpiece is maintained under pressure, the first pressure-maintaining head 202 can be driven by the second cylinder 2015 to move horizontally and extend into the inner cavity of the workpiece, and then the first pressure-maintaining head 202 can be pushed by the first cylinder 2012 to move tilted, so that the first pressure-maintaining head 202 is pushed and pressed against the inner cavity of the workpiece by the first cylinder 2012 to maintain pressure, thereby achieving better pressure-maintaining effect and higher efficiency. In a preferred embodiment, a damper 80 is provided in the movement direction of the first drive group 201, so that when the first drive group 201 moves in the first direction, the first drive group 201 can be buffered and decelerated by the damper 80, thereby making the movement of the first pressure-maintaining head 202 more stable.

[0058] Furthermore, the first pressure-maintaining head 202 has a first curved surface 2021 adapted to the inner cavity of the workpiece, the first curved surface 2021 is used to maintain the pressure of the curved surface of the inner cavity of the workpiece, and the first curved surface 2021 is provided with a first profiling groove 2022, when the first pressure-maintaining head 202 extends into the inner cavity of the workpiece, the first profiling groove 2022 is engaged with the inner cavity of the workpiece. The inner cavity of the workpiece has a plurality of raised reinforcing ribs, when the first pressure-maintaining head 202 extends into the inner cavity of the workpiece, the reinforcing ribs can be engaged with the first profiling groove 2022, so that the first curved surface 2021 can fit more closely with the curved surface of the inner cavity of the workpiece, and the pressure-maintaining effect is better.

[0059] Reference Figure 1 , Figure 4 and Figure 5 As shown, the second pressure head assembly 30 includes a second drive group 301 and a second pressure-maintaining head 302, and the second drive group 301 is arranged on the frame 10; the second pressure-maintaining head 302 is connected to the second drive group 301, and is used to be driven by the second drive group 301 to extend into the inner cavity of the workpiece in the first direction, and then move along the second preset angle to be pressed against the inner cavity of the workpiece. It can be understood that a damper 80 is also provided in the movement direction of the second drive group 301, so that when the second drive group 301 moves in the first direction, the second drive group 301 can be buffered and decelerated by the damper 80, thereby making the movement of the second pressure-maintaining head 302 more stable.

[0060] Among them, the second driving group 301 includes a second inclined seat 3011 arranged on the frame 10 and extending downwardly in an inclined direction toward the first direction; the third cylinder 3012 is arranged on the second inclined seat 3011; the second transmission plate 3013 is slidably arranged on the second inclined seat 3011; the second fixed plate 3014 is arranged on the second transmission plate 3013 in the horizontal direction and is connected to the second cylinder 2015, and is used to move along a preset angle with the third cylinder 3012 after the second pressure maintaining head 302 extends into the inner cavity of the workpiece, so that the second pressure maintaining head 302 is pressed tightly against the inner cavity of the workpiece; wherein the second fixed plate 3014 is slidably connected to the second pressure maintaining head 302; the fourth cylinder 3015 is arranged on the second fixed plate 3014 and is connected to the second pressure maintaining head 302, and is used to drive the second pressure maintaining head 302 to move toward the first direction to extend into the inner cavity of the workpiece.

[0061] In this embodiment, when maintaining pressure on the side and bottom surfaces of the inner cavity of the workpiece, the fourth cylinder 3015 can be used to drive the second pressure-maintaining head 302 to move horizontally and extend into the inner cavity of the workpiece, and then the third cylinder 3012 can be used to drive the second pressure-maintaining head 302 to move tilted a certain distance and extend into the inner cavity of the workpiece, thereby causing the second pressure-maintaining head 302 to be offset by a preset angle in the inner cavity of the workpiece, thereby performing pressure-maintaining fitting; optionally, the preset angle can be 5-10 degrees.

[0062] Specifically, the second pressure-maintaining head 302 has a second curved surface 3021 and a side pressure surface 3022 adapted to the inner cavity of the workpiece, the side pressure surface 3022 is used to maintain pressure on the side of the inner cavity of the workpiece, and the second curved surface 3021 is used to maintain pressure on the bottom surface of the inner cavity of the workpiece; wherein, the second curved surface 3021 is provided with a second contoured groove 3023, and when the second pressure-maintaining head 302 extends into the inner cavity of the workpiece, the second contoured groove 3023 is engaged with the inner cavity of the workpiece.

[0063] Among them, the area of ​​the second curved surface 3021 is half of the area of ​​the first curved surface 2021. Therefore, when the second pressure-maintaining head 302 extends into the inner cavity of the workpiece for pressure maintaining, the second curved surface 3021 can maintain pressure on the bottom surface of the inner cavity of the workpiece, and the side pressure surface 3022 is formed into a plane, so that the side pressure surface 3022 can maintain pressure on the side of the inner cavity of the workpiece, and a second contoured groove 3023 is also provided on the second curved surface 3021, so that the second contoured groove 3023 can be adapted to the reinforcing ribs of the inner cavity of the workpiece, thereby maintaining pressure.

[0064] Reference Figure 6 and Figure 7 As shown, a screw rod 501 is provided at the bottom of the frame 10, and a screw motor 50 is provided at the bottom of the sliding plate 40 to cooperate with the screw rod 501 for transmission. The screw motor 50 is used to drive the sliding plate 40 to slide along the second direction so that the first pressure head assembly 20 or the second pressure head assembly 30 is driven to a predetermined position.

[0065] Furthermore, the sliding plate 40 has a sensing member 401 extending toward the frame 10, and the frame 10 is provided with a first trigger member 60 and a second trigger member 70 relatively along the second direction; when the first pressure head assembly 20 moves to a predetermined position, the sensing member 401 corresponds to the first trigger member 60 to stop the sliding plate 40 from moving; when the second pressure head assembly 30 moves to a predetermined position, the sensing member 401 corresponds to the second trigger member 70 to stop the sliding plate 40 from moving.

[0066] In this embodiment, the second direction is the length direction of the screw rod 501, and the screw motor 50 can move along the length direction of the screw rod 501, thereby driving the sliding plate 40 to move along the second direction, thereby driving the first pressure head assembly 20 or the second pressure head assembly 30 to move to a predetermined position for maintaining pressure. Through the corresponding contact between the sensing member 401 and the first trigger member 60 or the second trigger member 70, the first trigger member 60 or the second trigger member 70 can send a trigger signal, thereby controlling the screw motor 50 to stop rotating and stopping the sliding plate 40; optionally, the frame 10 is relatively provided with two dampers 80 along the second direction, and a stop block 402 is correspondingly provided on the sliding plate 40. When the sliding plate 40 moves so that the sensing member 401 corresponds to the first trigger member 60 or the second trigger member 70, the stop block 402 can abut against one of the dampers 80, thereby performing buffering and deceleration, so that the stability is better during the pressure maintaining process.

[0067] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0068] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An irregular inner cavity pressure-maintaining mechanism, characterized in that: include: frame; A first pressing head assembly is arranged on the frame; A second pressing head assembly is arranged on the frame and is arranged in parallel with the first pressing head assembly; The first pressing head assembly and the second pressing head assembly are used to move to predetermined positions and move in a first direction to extend into the inner cavity of the workpiece, respectively, so as to force the first pressing head assembly to pressurize the arc surface of the inner cavity of the workpiece, and the second pressing head assembly to pressurize the bottom surface and the side surface of the inner cavity of the workpiece; The first pressure head assembly comprises: A first driving group, arranged on the frame; A first pressure-maintaining head, which is connected to the first driving group and is used to be driven by the first driving group to extend into the inner cavity of the workpiece in the first direction and move along a predetermined angle to be pressed against the inner cavity of the workpiece; The second pressure head assembly comprises: A second driving group is arranged on the frame; A second pressure-maintaining head is connected to the second driving group, and is used for being driven by the second driving group to extend into the inner cavity of the workpiece toward the first direction, and then move along a second preset angle to be pressed against the inner cavity of the workpiece.

2. The irregular inner cavity pressure maintaining mechanism according to claim 1, characterized in that: The first drive group includes: A first inclined seat, disposed on the frame and extending obliquely upward toward the first direction; A first cylinder, disposed on the first tilting seat; A first transmission plate is slidably disposed on the first tilting seat and connected to the first cylinder, and is used to move along a predetermined angle with the first cylinder after the first pressure-maintaining head extends into the inner cavity of the workpiece, so that the first pressure-maintaining head is pressed tightly against the inner cavity of the workpiece; A first fixing plate, arranged on the first transmission plate in a horizontal direction, wherein the first fixing plate is slidably connected to the first pressure-maintaining head; The second cylinder is disposed on the first fixing plate and connected to the first pressure maintaining head, and is used for driving the first pressure maintaining head to move toward the first direction so as to extend into the inner cavity of the workpiece.

3. The irregular inner cavity pressure maintaining mechanism according to claim 1 or 2, characterized in that: The first pressure-maintaining head has a first arcuate surface adapted to the inner cavity of the workpiece, the first arcuate surface is used to maintain the pressure of the arcuate surface of the inner cavity of the workpiece, and the first arcuate surface is provided with a first contoured groove, when the first pressure-maintaining head extends into the inner cavity of the workpiece, the first contoured groove is embedded in the inner cavity of the workpiece.

4. The irregular inner cavity pressure-maintaining mechanism according to claim 1, characterized in that: The second drive group includes: A second inclined seat, disposed on the frame and extending downwardly and obliquely toward the first direction; a third cylinder, disposed on the second inclined seat; a second transmission plate slidably disposed on the second tilting seat; A second fixing plate is horizontally arranged on the second transmission plate and connected to the third cylinder, and is used to move along a preset angle with the third cylinder after the second pressure-maintaining head extends into the inner cavity of the workpiece, so that the second pressure-maintaining head is pressed tightly against the inner cavity of the workpiece; wherein the second fixing plate is slidably connected to the second pressure-maintaining head; The fourth cylinder is disposed on the second fixing plate and connected to the second pressure maintaining head, and is used for driving the second pressure maintaining head to move toward the first direction so as to extend into the inner cavity of the workpiece.

5. The irregular inner cavity pressure maintaining mechanism according to claim 1 or 4, characterized in that: The second pressure-maintaining head has a second curved surface and a side pressure surface adapted to the inner cavity of the workpiece, the side pressure surface is used to maintain pressure on the side surface of the inner cavity of the workpiece, and the second curved surface is used to maintain pressure on the bottom surface of the inner cavity of the workpiece; wherein, the second curved surface is provided with a second contoured groove, and when the second pressure-maintaining head extends into the inner cavity of the workpiece, the second contoured groove is engaged with the inner cavity of the workpiece.

6. The irregular inner cavity pressure maintaining mechanism according to claim 1, characterized in that: The frame is provided with a sliding plate sliding along a second direction, the second direction is horizontally perpendicular to the first direction, and the first pressing head assembly and the second pressing head assembly are arranged on the sliding plate to move to the predetermined position along with the sliding plate.

7. The irregular inner cavity pressure-maintaining mechanism according to claim 6, characterized in that: A screw rod is provided at the bottom of the frame, and a screw motor is provided at the bottom of the sliding plate to cooperate with the screw rod for transmission. The screw motor is used to drive the sliding plate to slide along the second direction so that the first pressure head assembly or the second pressure head assembly is driven to the predetermined position.

8. The irregular inner cavity pressure-maintaining mechanism according to claim 7, characterized in that: The sliding plate has a sensing member extending toward the frame, and the frame is provided with a first trigger member and a second trigger member opposite to each other along the second direction; When the first pressing head assembly moves to the predetermined position, the sensing member corresponds to the first trigger member to stop the sliding plate from moving; when the second pressing head assembly moves to the predetermined position, the sensing member corresponds to the second trigger member to stop the sliding plate from moving.

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