Multi-petal inwardly retracting core knockout mechanism

Abstract

The utility model discloses a kind of multi-petal type inner shrinkage core stripping mechanism, it includes drive group, transmission control group and inner shrinkage mould, the inner shrinkage mould is composed of inner petal mould group and outer petal mould group, inner petal mould group is composed of multiple inner petal mould, outer petal mould has multiple outer petal mould, and inner petal mould and outer petal mould are alternately distributed;The drive group is connected with transmission control group, and drives the transmission control group linkage;The inner shrinkage mould is connected with transmission control group, and by transmission control group control the inner petal mould group, outer petal mould group sequentially carries out inner shrinkage movement.The utility model described technical scheme utilizes transmission control group to control the inner petal mould group and outer petal mould group to carry out inner shrinkage displacement in sequence, to reach the purpose of inner shrinkage stripping, reach efficient, safe and complete product stripping movement.

Description

Technical Field

[0001] This utility model relates to the field of injection molds, and in particular to a multi-lobed internal shrinkage core demolding mechanism. Background Technology

[0002] For injection-molded products with an internal undercut structure, traditional demolding methods include elastic internal core retraction and angled six-lobed demolding. Elastic internal core retraction involves the outer lobes detaching from the core after it's removed, utilizing the steel's own elastic deformation to release the undercut. This method relies entirely on the steel's elasticity, and the deformation gradually weakens, failing to meet production requirements, and replacement often incurs high costs. Angled six-lobed demolding uses a traditional angled extraction mechanism with dovetail grooves to control lobe demolding. While the mechanical structure is more stable and reliable than elastic internal core retraction, this structure has many limitations. The angled extraction angle between the inner and outer lobes is strictly limited, and for the aforementioned products, the parting line is very likely to be located at the tip of the internal diamond pattern, causing the steel to become thin and easily damaged during processing and production. This poses too high a risk and is not feasible.

[0003] Therefore, designing a low-cost, safe, and efficient demolding structure for products with an internal full-circle undercut structure is one of the technical problems that needs to be solved by those skilled in the art. Utility Model Content

[0004] The purpose of this invention is to provide a multi-lobed internal shrinkage core demolding mechanism.

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

[0006] A multi-lobed inner core demolding mechanism includes a drive assembly, a transmission control assembly, and an inner mold, wherein:

[0007] The inner lobe module is composed of an inner lobe module and an outer lobe module. The inner lobe module is composed of multiple inner lobe modules, and the outer lobe module is composed of multiple outer lobe modules. The inner lobe modules and outer lobe modules are alternately distributed.

[0008] The drive group is connected to the transmission control group and drives the transmission control group to work together.

[0009] The inner retraction mold is connected to the transmission control group, and the transmission control group controls the inner lobe module and the outer lobe module to retract in sequence.

[0010] A further preferred embodiment: the transmission control group is provided with an inner flap mold retraction control channel and an outer flap mold retraction control channel;

[0011] The inner valve mold is connected to the inner valve mold retraction control channel, and the outer valve mold is connected to the outer valve mold retraction control channel, which is used to control the inner and outer valve molds to retract sequentially.

[0012] A further preferred embodiment: the transmission control group includes a first control board and a second control board stacked together, wherein:

[0013] The first control board is connected to the drive group via a transmission column and is driven to rotate by the drive group;

[0014] The first control board has an inner valve mold control hole and an outer valve mold control hole;

[0015] The second control board has inner valve mold guide holes and outer valve mold guide holes;

[0016] The inner valve mold control hole communicates with the inner valve mold guide hole to form the inner valve mold retraction control channel, and the outer valve mold control hole communicates with the outer valve mold guide hole to form the outer valve mold retraction control channel.

[0017] A further preferred embodiment: the inner valve mold control hole has an inner valve mold pilot section and an inner valve mold rear pilot section, and the outer valve mold control hole has an outer valve mold pilot section and an outer valve mold rear pilot section;

[0018] The inner lobe mold pilot section is arranged along the rotation direction of the first control plate, and the outer lobe mold rear pilot section is arranged along the rotation direction of the first control plate. The first control plate controls the inner lobe mold to retract inward before the outer lobe mold.

[0019] A further preferred embodiment: the inner lobe mold rear guide segment is bent toward the center of the first control plate;

[0020] The outer lobe mold pilot segment is inclined toward the center of the first control plate.

[0021] A further preferred embodiment: the inner flap mold has an inner flap mold driving column and an inner flap mold positioning part, wherein:

[0022] The inner flap mold drive column passes through the inner flap mold guide hole of the second control plate, extends into the inner flap mold control hole of the first control plate, and is controlled by the drive group to preferentially perform inward retraction movement;

[0023] The inner valve mold positioning part is placed in the inner valve mold positioning groove; the inner valve mold positioning groove is located on the second control plate.

[0024] A further preferred embodiment: the outer lobe mold has an outer lobe mold driving post and an outer lobe mold positioning part, wherein:

[0025] The outer flap mold drive column passes through the outer flap mold guide hole of the second control plate, extends into the outer flap mold control hole of the first control plate, and is controlled by the drive group to perform an inward retraction movement;

[0026] The outer valve mold positioning part is placed in the outer valve mold positioning groove; the outer valve mold positioning groove is located on the second control plate.

[0027] Further preferred: the rotational control range of the inner retraction motion of the first control board is 0°-Y°, and the rotational control range includes two control segments, namely 0°-X° and X°-Y°, which correspond to the inner retraction motion of the inner flap mold and the outer flap mold respectively.

[0028] A further preferred embodiment is a structure in which multiple inner and outer lobes are alternately distributed and enclosed in a cylindrical shape.

[0029] A further preferred embodiment: the drive assembly includes a hydraulic cylinder and a drive rod, wherein:

[0030] The drive rod is connected to the hydraulic cylinder and is driven by the hydraulic cylinder to move synchronously.

[0031] The drive rod has a drive hole at the end away from the oil cylinder for connecting to the transmission control group.

[0032] By adopting the above technical solution, this utility model has the following advantages compared with the prior art:

[0033] This utility model designs a multi-lobed internal shrinkage mold, which is composed of an inner lobe module and an outer lobe module. The inner lobe module is composed of multiple inner lobe modules, and the outer lobe module is composed of multiple outer lobe modules. The inner lobe modules and outer lobe modules are alternately distributed. The scheme also uses a transmission control group to control the inner lobe modules and outer lobe modules to move inward sequentially, thereby achieving the purpose of internal shrinkage demolding, and achieving efficient, safe and complete product demolding movement. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the multi-lobed inner core demolding mechanism described in this embodiment of the present invention;

[0035] Figure 2 This is a structural front view of the multi-lobed inner core demolding mechanism described in this embodiment of the utility model;

[0036] Figure 3 This is an exploded view of the multi-lobed inner core demolding mechanism described in this embodiment of the present invention. Figure 1 ;

[0037] Figure 4 This is an exploded view of the multi-lobed inner core demolding mechanism described in this embodiment of the present invention. Figure 2 ;

[0038] Figure 5 This is a partial structural cross-section of the multi-lobed inner core demolding mechanism described in this embodiment of the present invention. Figure 1 ;

[0039] Figure 6This is a partial structural cross-section of the multi-lobed inner core demolding mechanism described in this embodiment of the present invention. Figure 2 ;

[0040] Figure 7 This is a three-dimensional structural schematic diagram of the inner shrinkage mold described in the embodiment of this utility model;

[0041] Figure 8 This is an exploded view of the internal shrinkage mold described in this embodiment of the present invention;

[0042] Figure 9 This is a schematic diagram of the structure of the outer lobe mold in the inner shrinkage mold described in this embodiment of the utility model;

[0043] Figure 10 This is a schematic diagram of the structure of the inner lobe mold in the inner shrinkage mold described in this embodiment of the utility model;

[0044] Figure 11 This is a three-dimensional schematic diagram of the structure of the first control board in this embodiment of the present invention;

[0045] Figure 12 yes Figure 11 Front view of the structure shown;

[0046] Figure 13 This is a schematic diagram of the structure of the second control board in an embodiment of this utility model;

[0047] Figure 14 yes Figure 13 Rear view of the structure shown.

[0048] The markings on the accompanying drawings in the above specification are explained as follows:

[0049] 110. Hydraulic cylinder; 120. Drive rod; 121. Drive hole;

[0050] 200. Transmission control assembly; 210. First control board; 211. Transmission column; 212. Inner lobe mold control hole; 2121. Inner lobe mold pilot section; 2122. Inner lobe mold rear guide section; 213. Outer lobe mold control hole; 2131. Outer lobe mold pilot section; 2132. Outer lobe mold rear guide section; 220. Second control board; 221. Inner lobe mold positioning groove; 222. Inner lobe mold guide hole; 223. Outer lobe mold positioning groove; 224. Outer lobe mold guide hole; 225. Screw; 226. Central countersunk groove; 227. Locking hole;

[0051] 300, Inner lobe module; 310, Inner lobe module; 311, Inner lobe module; 312, Inner lobe module positioning part; 313, Inner lobe module drive post; 320, Outer lobe module; 321, Outer lobe module; 322, Outer lobe module positioning part; 323, Outer lobe module drive post. Detailed Implementation

[0052] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0053] It should be noted that in this utility model, the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", and "outer" are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element of this utility model must have a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0054] Example

[0055] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, this utility model discloses a multi-lobed internal core-shrinking demolding mechanism, which designs a multi-lobed internal core-shrinking mold 300. The internal core-shrinking mold 300 is composed of an inner lobe module 310 and an outer lobe module 320. The inner lobe module 310 is composed of multiple inner lobe molds 311, and the outer lobe module 320 is composed of multiple outer lobe molds 321. The inner lobe molds 311 and outer lobe molds 321 are alternately arranged to form a cylindrical shape for the internal core-shrinking mold 300. This technical solution utilizes the above-mentioned multi-lobed structural design to achieve a distributed internal shrinkage structure, thereby achieving a convenient core-pulling demolding and forming mechanism.

[0056] like Figure 1 and Figure 2 As shown, in order to drive the inner shrinkage mold 300, a drive module is also provided, which includes a drive group and a transmission control group 200.

[0057] like Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the purpose of the drive group is to provide effective power for the inward movement of the inner mold 300. Specifically, the drive group includes a hydraulic cylinder 110 and a drive rod 120. The hydraulic cylinder 110 is fixedly connected to the drive rod 120 and is used to drive the drive rod 120 to move synchronously, thereby achieving the purpose of power transmission. The drive rod 120 is a straight rod, with one end fixedly connected to the hydraulic cylinder 110 and the other end being the drive end. The drive end is connected to the transmission control group 200. The drive end of the drive rod 120 has a drive hole 121, which is located away from the hydraulic cylinder 110. The drive hole 121 is used to connect to the transmission control group 200 and drive the transmission control group 200 to move.

[0058] like Figure 2 , Figure 4 and Figure 5 As shown, the transmission control group 200 is connected to and driven by the drive group. The transmission control group 200 includes a first control board 210 and a second control board 220, which are arranged overlappingly. The first control board 210 has a protruding transmission column 211, which is located close to the drive rod 120 and connected to the drive rod 120 through the transmission column 211.

[0059] like Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 11 and Figure 12 As shown, the first control plate 210 is positioned between the drive rod 120 and the second control plate 220. A transmission column 211 is located on the side facing the drive rod 120, near the edge of the first control plate 210. The first control plate 210 is provided with an inner flap mold control hole 212 and an outer flap mold control hole 213, used to control the movement of the inner flap mold 311 and the outer flap mold 321, thereby controlling the movement of the inner flap mold 311 and the outer flap mold 321 sequentially. Both the inner flap mold control hole 212 and the outer flap mold control hole 213 are through holes penetrating the first control plate 210. The number and distribution of the inner flap mold control holes 212 and the outer flap mold control holes 213 are adapted to the number and distribution of the inner flap mold 311 and the outer flap mold 321 of the inner shrink mold 300. It should be noted that the drive rod 120 drives the first control plate 210 to rotate, and therefore, the first control plate 210 is preferably an annular plate. Specifically: The inner flap mold control hole 212 includes an inner flap mold pilot section 2121 and an inner flap mold rear guide section 2122 that are interconnected. The inner flap mold pilot section 2121 is arranged along the rotation direction of the first control plate 210, and the inner flap mold rear guide section 2122 is bent towards the center of the first control plate 210. The inner flap mold pilot section 2121 and the inner flap mold rear guide section 2122 are interconnected, forming an L-shaped through hole with an obtuse angle between the inner flap mold pilot section 2121 and the inner flap mold rear guide section 2122. The outer lobe mold control hole 213 includes an outer lobe mold pilot section 2131 and an outer lobe mold rear guide section 2132. The outer lobe mold pilot section 2131 is inclined toward the center of the first control plate 210, and the outer lobe mold rear guide section 2132 is arranged along the rotation direction of the first control plate 210. The outer lobe mold pilot section 2131 and the outer lobe mold rear guide section 2132 are interconnected to form an L-shaped through hole with an obtuse angle between the inner lobe mold pilot section 2121 and the inner lobe mold rear guide section 2122.

[0060] It should be noted that: Figure 12As shown, the inner lobe mold pilot section 2121 and the inner lobe mold rear guide section 2122 are arranged sequentially from the edge of the first control plate 210 toward its center; the outer lobe mold pilot section 2131 and the outer lobe mold rear guide section 2132 are also arranged sequentially from the edge of the first control plate 210 toward its center.

[0061] like Figure 2 As shown, the second control plate 220 is stacked on top of the first control plate 210 and positioned away from the drive rod 120. The second control plate 220 is a plate that needs to be fixedly assembled, and its shape is not necessarily required. Figure 2 , Figure 3 , Figure 13 and Figure 14 As shown, in this embodiment, the second control plate 220 is a square plate. Locking holes 227 are formed at the four corners of the second control plate 220. Each locking hole is used to insert a screw 225, which locks and fixes the second control plate 220 in place. The second control plate 220 has inner flap mold guide holes 222 and outer flap mold guide holes 224. Both the inner flap mold guide holes 222 and the outer flap mold guide holes 224 are through holes that pass through the second control plate 220. The number and distribution of the inner flap mold guide holes 222 and the outer flap mold guide holes 224 are adapted to the number and distribution of the inner flap mold 311 and the outer flap mold 321 of the inner shrink mold 300. Specifically: the side of the second control plate 220 facing away from the first control plate 210 is a mounting surface for installation with the inner mold 300. This mounting surface has a central recess 226, the shape of which is adapted to the inner mold 300 and used for its installation. In this embodiment, the central recess 226 is a circular groove. The inner mold guide hole 222 and the outer mold guide hole 224 are both radially distributed along the central recess 226, and the diameter of the inner mold guide hole 222 is larger than the diameter of the outer mold guide hole 224. Figure 5 and Figure 6 As shown, the inner valve mold guide hole 222 is superimposed and connected with the inner valve mold control hole 212 of the first control plate 210 to form an inner valve mold retraction control channel, and the outer valve mold guide hole 224 is superimposed and connected with the outer valve mold control hole 213 to form an outer valve mold retraction control channel.

[0062] like Figure 11 and Figure 12As shown, to limit the inward retraction position of the inner lobe mold 311 and the outer lobe mold 321 in the inner retraction mold 300, an inner lobe mold positioning groove 221 and an outer lobe mold positioning groove 223 are formed on the mounting surface of the second control plate 220. The inner lobe mold positioning groove 221 is provided corresponding to the inner lobe mold guide hole 222. Specifically, the inner lobe mold positioning groove 221 is radially distributed along the central recess 226 and is located closer to the edge of the second control plate 220 than the inner lobe mold guide hole 222. The inner lobe mold positioning groove 221 and the central recess 226 are interconnected. Figure 13 As shown, the outer lobe mold positioning groove 223 is provided corresponding to the outer lobe mold guide hole 224. Specifically, the outer lobe mold positioning groove 223 is distributed radially along the central recess 226 and is located closer to the edge of the second control plate 220 than the outer lobe mold guide hole 224. The inner lobe mold positioning groove 221 is interconnected with the central recess 226.

[0063] like Figure 1 As shown, the inner shrinkage mold 300 is connected to the transmission control group 200, and is driven by the transmission control group 200 to perform an inner shrinkage displacement, thereby achieving the purpose of product demolding through inner shrinkage deformation. Figure 7 and Figure 8 As shown, the inner shrinkage mold 300 is cylindrical and adopts a multi-lobed structural design; specifically, the inner shrinkage mold 300 is composed of an inner lobe module 310 and an outer lobe module 320. The inner lobe module 310 is composed of multiple inner lobe molds 311, and the outer lobe module 320 is composed of multiple outer lobe molds 321. The inner lobe molds 311 and outer lobe molds 321 are alternately arranged to form a cylindrical structure, that is: Figure 5 and Figure 6 As shown, the two sides of any one inner lobe mold 311 are in close contact with the two outer lobe molds 321 but are not linked, meaning that any one inner lobe mold 311 can move independently; similarly, the two sides of any one outer lobe mold 321 are in close contact with the two inner lobe molds 311 but are not linked, meaning that any one outer lobe mold 321 can move independently. The number of inner lobe molds 311 and outer lobe molds 321 can be the same or different, but generally, the number of inner lobe molds 311 and outer lobe molds 321 is the same, such as... Figure 7 and Figure 8 As shown, in this embodiment, the inner lobe module 310 consists of six inner lobe modules 311, and the outer lobe module 320 consists of six outer lobe modules 321. The inner lobe modules 311 and outer lobe modules 321 are alternately arranged to form a cylindrical structure. Figure 3 , Figure 4 , Figure 11 , Figure 12 , Figure 13 and Figure 14As shown, based on this quantity and structural design, the first control plate 210 has six inner flap mold control holes 212 and six outer flap mold control holes 213, which are alternately arranged in a circular pattern; the second control plate 220 has six inner flap mold guide holes 222 and six inner flap mold positioning grooves 221, and six outer flap mold guide holes 224 and six outer flap mold positioning grooves 223, which are alternately arranged in a circular pattern. The six inner flap mold guide holes 222 and six outer flap mold guide holes 224 are arranged in a one-to-one correspondence with the six inner flap mold guide holes 222, and the six outer flap mold positioning grooves 223 are arranged in a one-to-one correspondence with the six outer flap mold guide holes 224.

[0064] like Figure 10 As shown, any one of the inner flap molds 311 includes an inner flap mold body, an inner flap mold positioning part 312, and an inner flap mold driving post 313. The inner flap mold body, the inner flap mold positioning part 312, and the inner flap mold driving post 313 are an integral structure. The inner flap mold positioning part 312 and the inner flap mold driving post 313 are both located at one end of the inner flap mold body, which is the driving end of the inner flap mold 311. That is, the inner flap mold positioning part 312 and the inner flap mold driving post 313 are located at the driving end of the inner flap mold 311. Specifically: combined with Figure 6 As shown, the inner flap mold driving column 313 is arranged along the direction of the inner flap mold body and sequentially passes through the inner flap mold guide hole 222 of the second control plate 220 and extends into the inner flap mold control hole 212 of the first control plate 210. The inner flap mold positioning part 312 is arranged radially along the outer side of the inner flap mold body along the inner shrinking mold 300 and is locked in the inner flap mold positioning groove 221. Based on the above structural arrangement, when the hydraulic cylinder 110 drives the driving rod 120 to move synchronously, the first control plate 210 is driven to rotate through the driving hole 121 and the transmission column 211. The rotating first control plate 210 drives the inner flap mold control hole 212 to rotate synchronously, and then drives the inner flap mold 311 to move inward toward the center of the inner shrinking mold 300 through the inner flap mold driving column 313. That is, all six inner flap molds 311 move inward toward the center of the inner shrinking mold 300 simultaneously.

[0065] It should be noted that: combination Figures 3 to 13 As shown, the first and second control plates 220 are stacked, so that the inner flap mold guide hole 222 and the inner flap mold control hole 212 are connected, and the inner flap mold drive column 313 of the inner flap mold 311 is inserted through it; based on the structural design of the inner flap mold guide hole 222 and the inner flap mold control hole 212, the rotating first control plate 210 can drive the inner flap mold 311 to retract towards the center of the inner shrink mold 300, thereby achieving the purpose of inner shrink demolding.

[0066] like Figure 9As shown, any of the outer lobe molds 321 includes an outer lobe mold body, an outer lobe mold positioning part 322, and an outer lobe mold driving post 323. The outer lobe mold body, the outer lobe mold positioning part 322, and the outer lobe mold driving post 323 are an integral structure. The outer lobe mold positioning part 322 and the outer lobe mold driving post 323 are both located at one end of the outer lobe mold body, which is the driving end of the outer lobe mold 321. That is, the outer lobe mold positioning part 322 and the outer lobe mold driving post 323 are located at the driving end of the outer lobe mold 321. Specifically: combined with Figure 5 As shown, the outer flap mold driving column 323 is arranged along the direction of the outer flap mold body and sequentially passes through the outer flap mold guide hole 224 of the second control plate 220 and extends into the outer flap mold control hole 213 of the first control plate 210. The outer flap mold positioning part 322 is arranged radially on the outside of the outer flap mold body and is locked in the outer flap mold positioning groove 223. Based on the above structural arrangement, when the hydraulic cylinder 110 drives the driving rod 120 to move synchronously, the first control plate 210 is driven to rotate through the driving hole 121 and the transmission column 211. The rotating first control plate 210 drives the outer flap mold control hole 213 to rotate synchronously, and then the outer flap mold 321 is driven to move inward toward the center of the inner shrinking mold 300 through the outer flap mold driving column 323. That is, all six outer flap molds 321 move inward toward the center of the inner shrinking mold 300 simultaneously.

[0067] It should be noted that: combination Figures 3 to 13 As shown, the first and second control plates 220 are stacked, so that the outer lobe mold guide hole 224 and the outer lobe mold control hole 213 are connected, and the outer lobe mold drive column 323 of the outer lobe mold 321 is inserted through it; based on the structural design of the outer lobe mold guide hole 224 and the outer lobe mold control hole 213, the rotating first control plate 210 can drive the outer lobe mold 321 to retract towards the center of the inner retraction mold 300, thereby achieving the purpose of inner retraction demolding.

[0068] It is also necessary to explain that: combining Figures 3 to 13As shown, since the inner lobe mold pilot section 2121 of the inner lobe mold control hole 212 on the first control plate 210 is set along the rotation direction of the first control plate 210, while the outer lobe mold pilot section 2131 of the outer lobe mold control hole 213 is inclined toward the center of the first control plate 210, the inner lobe mold performs the inward retraction movement preferentially over the outer lobe mold. The effective rotation control range of the first control plate is set to 0°-Y°, and a control angle X° is set within this control range to divide the rotation control range into two control segments, namely 0°-X° and X°-Y°. Specifically, when the first control plate 210 rotates from a stationary position to X°, the first control plate 210 drives the inner flap mold 311 to perform an inward retraction displacement through the inner flap mold drive column 313. As it continues to rotate to Y°, the first control plate 210 drives the outer flap mold 321 to perform an inward retraction displacement through the outer flap mold drive column 323, thereby achieving the inward retraction displacement of the entire inner flap mold 300 and achieving the purpose of product demolding. In other words, during the rotation of the first control plate 210 from 0° to Y°, there are two inward movement stages. Specifically, the two inward movement stages include a first stage and a second stage. In the first stage, during the rotation of the first control plate 210 from 0° to X°, the inner lobe mold 311 is driven and controlled to perform inward movement. In the second stage, during the rotation of the first control plate 210 from X° to Y°, the outer lobe mold 321 is driven and controlled to perform inward movement. In this embodiment, X° is 10° and Y° is 20°, that is: during the rotation of the first control plate 210 from 0° to 10°, the inner lobe mold 311 in the inner shrinking mold 300 is driven to perform an inward shrinking displacement movement, while the outer lobe mold 321 is in a stationary state, that is: the outer lobe mold 321 is not driven to perform an inward shrinking displacement movement at this time; during the continued rotation of the first control plate 210 from 10° to 20°, the outer lobe mold 321 in the inner shrinking mold 300 is driven to perform an inward shrinking displacement movement, while the inner lobe mold 311 is in a stationary state, that is: the inner lobe mold 311 is not driven to perform an inward shrinking displacement movement at this time.

[0069] The inner lobe mold 311 and the outer lobe mold 321 are formed on the side facing away from the center line of the inner shrink mold 300. The forming surface is provided with a forming structure adapted to the product.

[0070] Combination Figures 1 to 13 As shown in the figure, the motion process and motion principle of the multi-lobed inner core demolding mechanism described in this embodiment are as follows:

[0071] In the drive assembly, the hydraulic cylinder 110 is started and drives the drive rod 120 to move synchronously. The drive rod 120 is connected to the transmission control assembly 200 and linked together through the drive hole 121 provided on it.

[0072] In the transmission control group 200, the first control plate 210 is provided with a transmission column 211, and is driven by the drive rod 120 to rotate. The rotation control range of the first control plate 210 is 0°-Y° (the effective rotation angle in this embodiment is 0°-20°). The second control plate 220, which is stacked with the first control plate 210, is a fixed plate and does not shift due to the rotation of the first control plate 210. In the structural design of the transmission control group 200, the structural design of the inner flap mold control hole 212 and the outer flap mold control hole 213 on the first control plate 210 directly controls the rotation of the inner flap mold control hole 212 and the outer flap mold control hole 213. The inner lobe mold 311 and the outer lobe mold 321 retract inward displacement movements are controlled by the inner lobe mold guide hole 222 and the outer lobe mold guide hole 224 opened on the second control plate 220. The inner lobe mold guide hole 222 and the outer lobe mold guide hole 224 are respectively connected to the inner lobe mold control hole 212 and the outer lobe mold control hole 213 of the first control plate 210, forming a motion trajectory control for the inward displacement of the inner lobe mold 311 and the outer lobe mold 321 of the inward shrinking mold 300. Therefore, the transmission control group 200 can effectively control the inward movement sequence and inward movement trajectory of the inner lobe mold 311 and the outer lobe mold 321.

[0073] The inner retraction mold 300 is composed of multiple inner lobe molds 311 and multiple outer lobe molds 321 arranged alternately. Each inner lobe mold 311 is driven by an inner lobe mold drive column 313, which passes through the inner lobe mold guide hole 222 in the transmission control group 200 and extends into the inner lobe mold control hole 212. Each outer lobe mold 321 is driven by an outer lobe mold drive column 323, which passes through the outer lobe mold guide hole 224 in the transmission control group 200 and extends into the outer lobe mold control hole 213, thereby controlling the inner lobe mold 311 and the outer lobe mold 321 to perform inward retraction displacement movement in sequence.

[0074] In summary, the hydraulic cylinder 110 drives the first control plate 210 to rotate via the drive rod 120. When the first control plate 210 rotates from 0° to 10°, the inner lobe mold 311 in the inner shrinking mold 300 is driven to perform an inward shrinking displacement movement. At this time, the outer lobe mold 321 is in a stationary state, that is, the outer lobe mold 321 is not driven to perform an inward shrinking displacement movement. As the first control plate 210 continues to rotate from 10° to 20°, the outer lobe mold 321 in the inner shrinking mold 300 is driven to perform an inward shrinking displacement movement. At this time, the inner lobe mold 311 is in a stationary state, that is, the inner lobe mold 311 is not driven to perform an inward shrinking displacement movement.

[0075] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A multi-lobed internal core demolding mechanism, characterized in that: It includes a drive unit, a transmission control unit, and an internal shrinking mold, wherein: The inner lobe module is composed of an inner lobe module and an outer lobe module. The inner lobe module is composed of multiple inner lobe modules, and the outer lobe module is composed of multiple outer lobe modules. The inner lobe modules and outer lobe modules are alternately distributed. The drive group is connected to the transmission control group and drives the transmission control group to work together. The inner retraction mold is connected to the transmission control group, and the transmission control group controls the inner lobe module and the outer lobe module to retract in sequence.

2. The multi-lobed internal core demolding mechanism according to claim 1, characterized in that: The transmission control group is equipped with an inner flap mold retraction control channel and an outer flap mold retraction control channel. The inner valve mold is connected to the inner valve mold retraction control channel, and the outer valve mold is connected to the outer valve mold retraction control channel, which is used to control the inner and outer valve molds to retract sequentially.

3. The multi-lobed internal core demolding mechanism according to claim 2, characterized in that: The transmission control assembly includes a first control board and a second control board stacked together, wherein: The first control board is connected to the drive group via a transmission column and is driven to rotate by the drive group; The first control board has an inner valve mold control hole and an outer valve mold control hole; The second control board has inner valve mold guide holes and outer valve mold guide holes; The inner valve mold control hole communicates with the inner valve mold guide hole to form the inner valve mold retraction control channel, and the outer valve mold control hole communicates with the outer valve mold guide hole to form the outer valve mold retraction control channel.

4. The multi-lobed internal core demolding mechanism according to claim 3, characterized in that: The inner valve mold control hole has an inner valve mold pilot section and an inner valve mold rear guide section, and the outer valve mold control hole has an outer valve mold pilot section and an outer valve mold rear guide section. The inner lobe mold pilot section is arranged along the rotation direction of the first control plate, and the outer lobe mold rear pilot section is arranged along the rotation direction of the first control plate. The first control plate controls the inner lobe mold to retract inward before the outer lobe mold.

5. The multi-lobed internal core demolding mechanism according to claim 4, characterized in that: The inner lobe mold rear guide segment bends toward the center of the first control plate; The outer lobe mold pilot segment is inclined toward the center of the first control plate.

6. The multi-lobed internal core demolding mechanism according to claim 3, characterized in that: The inner flap mold has an inner flap mold driving column and an inner flap mold positioning part, wherein: The inner flap mold drive column passes through the inner flap mold guide hole of the second control plate, extends into the inner flap mold control hole of the first control plate, and is controlled by the drive group to preferentially perform inward retraction movement; The inner valve mold positioning part is placed in the inner valve mold positioning groove; the inner valve mold positioning groove is located on the second control plate.

7. The multi-lobed internal core demolding mechanism according to claim 3, characterized in that: The outer lobe mold has an outer lobe mold drive column and an outer lobe mold positioning part, wherein: The outer flap mold drive column passes through the outer flap mold guide hole of the second control plate, extends into the outer flap mold control hole of the first control plate, and is controlled by the drive group to perform an inward retraction movement; The outer valve mold positioning part is placed in the outer valve mold positioning groove; the outer valve mold positioning groove is located on the second control plate.

8. The multi-lobed internal core demolding mechanism according to claim 3, characterized in that: The rotational control range of the inner retraction motion of the first control board is 0°-Y°. This rotational control range includes two control segments: 0°-X° and X°-Y°, which correspond to the inner retraction motion of the inner lobe mold and the outer lobe mold, respectively.

9. The multi-lobed internal core demolding mechanism according to claim 1, characterized in that: Multiple inner and outer lobe molds are alternately distributed and enclosed in a cylindrical structure.

10. The multi-lobed internal core demolding mechanism according to claim 1, characterized in that: The drive assembly includes a hydraulic cylinder and a drive rod, wherein: The drive rod is connected to the hydraulic cylinder and is driven by the hydraulic cylinder to move synchronously. The drive rod has a drive hole at the end away from the oil cylinder for connecting to the transmission control group.

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